WO2022004329A1 - Construction machine - Google Patents

Abstract

This construction machine is provided with a lower traveling body. In a right crawler frame of a right crawler unit of said lower traveling body, a right crawler frame front part comprises: a right front cradle on which a right end of a front-side weight can be placed and which supports said right end of the front-side weight from below while the right end is being placed thereon; and a right front restriction part which restricts movement of the right end of the front-side weight placed on the right front cradle, toward the right and in the front/back directions. In a left crawler frame of a left crawler unit of said lower traveling body, a left crawler frame front part comprises: a left front cradle on which a left end of the front-side weight can be placed and which supports said left end of the front-side weight from below while the left end is being placed thereon; and a left front restriction part which restricts movement of the left end of the front-side weight placed on the left front cradle, toward the left and in the front/back directions.

Description

Construction machinery

The present invention relates to construction machinery.

Conventionally, crawler-type construction machines such as crawler cranes and hydraulic excavators have been known. The crawler-type construction machine includes a self-propelled crawler-type lower traveling body and an upper rotating body that is rotatably mounted on the lower traveling body. The crawler-type lower traveling body is arranged separately on the left and right sides of the car body that supports the upper turning body from below so that the upper turning body can turn, and is responsible for running the lower traveling body. It has a pair of left and right crawler units.

Each pair of left and right crawler units has a crawler frame that is connected to the car body and extends to the front and back of the car body. That is, the lower traveling body has a pair of left and right crawler frames that are separately arranged on the left and right sides of the car body and connected to the car body. In the crawler type construction machine, the lower traveling body has a traveling body weight arranged between the pair of left and right crawler frames in order to improve the stability of the machine body. Conventionally, the left end portion of the traveling body weight is arranged close to the left crawler unit, and the right end portion of the traveling body weight is arranged close to the left crawler unit, so that an operator or the like can use it. When moving between the left and right crawler units, there is one that makes it possible to move through the weight of the traveling body without once descending to the ground, facilitating the movement of workers and the like between the left and right crawler units.

Also, when the lower traveling body turns left and right, a bending moment in the left and right direction is generated in the left and right crawler frames. In order for the crawler frame itself to counter this bending moment, it is necessary to make the crawler frame very rigid. On the other hand, in Patent Document 1 below, the bending moment in the left-right direction is reduced by using the traveling body weight, whereby the crawler at the time of turning of the lower traveling body without significantly increasing the rigidity of the crawler frame. A technique capable of countering a bending moment in the left-right direction generated in a frame is disclosed.

Specifically, Patent Document 1 below discloses a crawler crane in which the lower traveling body has a front car body weight and a rear car body weight as traveling body weights. The front car body weight is located in front of the car body of the lower vehicle between the left and right crawler frames, and the rear car body weight is located behind the car body of the lower vehicle between the left and right crawler frames. Have been placed.

The front parts of the left and right crawler frames located on the front side of the front end of the car body are connected to the front car body weights via the left and right front lattice parts at the positions on the front side of the connection point of the crawler frame with respect to the car body. The rear parts of the left and right crawler frames located behind the rear end of the car body are located behind the connection point of the crawler frame with the car body via the left and right rear lattice parts. It is connected to the body weight. As a result, the arm length of the bending moment in the left-right direction of the front part of the left and right crawler frames becomes the length from the front end of those crawler frames to the connection point with respect to the left and right front lattice parts, and the left and right crawler frames. The arm length of the lateral bending moment of the rear portion is the length from the rear end portion of those crawler frames to the connection point with respect to the left and right rear lattice portions. For this reason, the front parts of the left and right crawler frames are not connected via the front car body weights, and the rear parts of the left and right crawler frames are not connected via the rear car body weights. The arm length of the bending moment can be reduced. As a result, the bending moment in the left-right direction generated in the left and right crawler frames when the lower traveling body is turned to the left and right can be reduced, and therefore, the rigidity of the crawler frame can be reduced in the left-right direction without significantly increasing the rigidity. It is possible to counter the bending moment.

The front car body weight and the left and right front lattice parts are connected, and the rear car body weight and the left and right rear lattice parts are connected by pin connection, respectively. Specifically, a through hole is formed in the joint portion provided at one end in the left-right direction of each lattice portion to penetrate in the front-rear direction, and the joint portion of the car body weight connected to the joint portion of the lattice portion is formed. Also has a through hole that penetrates in the front-back direction. By inserting a connecting pin into the through hole of the joint portion of the lattice portion and the through hole of the joint portion of the car body weight, each lattice portion and the corresponding car body weight are connected.

By the way, since the car body weight is large and has a large weight, it is required to be able to fix the car body weight between the left and right crawler frames with a simpler operation than before. For example, in the configuration of Patent Document 1, when fixing the car body weight between the left and right crawler frames, the through hole of the joint portion of the lattice portion and the car body weight are provided while the car body weight is suspended by an auxiliary crane or the like. It is necessary to align the joints with the through holes and insert the connecting pins into those through holes.

Japanese Unexamined Patent Publication No. 2019-206301

An object of the present invention is to facilitate the movement of an operator or the like between the left and right crawler units and to reduce the bending moment in the left-right direction generated in the left and right crawler frames when the lower crawler is turned. It is to provide a construction machine that can fix the weight between the left and right crawler frames with a simpler operation.

A construction machine according to one aspect of the present invention includes a self-propelled crawler-type lower traveling body and an upper rotating body rotatably mounted on the lower traveling body. The lower traveling body is a car body that supports the upper turning body from below so that the upper turning body can turn, and a left crawler unit that is separately arranged on the left and right sides of the car body and is responsible for running the car body. And a right crawler unit, and front and rear weights separately arranged in front of and behind the car body. The right crawler unit has a right crawler frame that is connected to the right end of the car body and extends in the front-rear direction. The left crawler unit has a left crawler frame that is connected to the left end of the car body and extends in the front-rear direction. The right crawler frame has a front portion of the right crawler frame projecting forward from the front end of the car body and a rear portion of the right crawler frame projecting rearward from the rear end of the car body. The left crawler frame has a front portion of the left crawler frame projecting forward from the front end of the car body and a rear portion of the left crawler frame projecting rearward from the rear end of the car body. The front part of the right crawler frame is a right front pedestal on which the right end portion of the front weight can be mounted, and the right front pedestal that supports the right end portion from below with the right end portion of the front weight mounted, and the right front portion. It has a right front restraint portion that restrains the movement of the right end portion of the front weight mounted on the frame in the front-rear direction and to the right. The front part of the left crawler frame is a left front pedestal on which the left end portion of the front weight can be mounted, and the left front pedestal that supports the left end portion from below with the left end portion of the front weight mounted, and the left front portion. It has a left front restraint portion that restrains the movement of the left end portion of the front weight mounted on the frame in the front-rear direction and to the left. The rear part of the right crawler frame is a right rear pedestal on which the right end of the rear weight can be placed, and is a right rear pedestal that supports the right end from below with the right end of the rear weight mounted. It has a right rear restraining portion that restrains the movement of the right end portion of the rear weight mounted on the right rear pedestal in the front-rear direction and to the right. The rear portion of the left crawler frame is a left rear pedestal on which the left end portion of the rear weight can be mounted, and is a left rear pedestal that supports the left end portion from below with the left end portion of the rear weight placed mounted. It has a left rear restraining portion that restrains the movement of the left end portion of the rear weight mounted on the left rear pedestal in the front-rear direction and to the left.

It is a schematic side view of the construction machine by one Embodiment of this invention. It is a top view of the lower traveling body of the construction machine by one Embodiment of this invention. It is sectional drawing at the position III-III of the lower traveling body shown in FIG. It is a figure which looked at the front weight and the right front connecting part of the lower traveling body shown in FIG. 2 from the right side to the left side. It is sectional drawing at the VV position of the right end portion and the right front connecting portion of the front weight shown in FIG. FIG. 4 is a view of the right front connecting portion shown in FIG. 4 as viewed from above with the front weight removed above the right front connecting portion. It is a figure which looked at the front side weight and the right front connecting part of the lower traveling body of the construction machine by the 1st modification of this invention from the right side to the left side. It is sectional drawing at the VIII-VIII position of the right end portion and the right front connecting portion of the front weight shown in FIG. 7. FIG. 7 is a view of the right end portion and the right front connecting portion of the front weight shown in FIG. 7 as viewed from above. It is the figure which looked at the right end part and the right front connection part of the front side weight of the lower traveling body of the construction machine by the 2nd modification of this invention from above. FIG. 10 is a view of the right end portion and the right front connecting portion of the front weight shown in FIG. 10 as viewed from the front. It is the figure which looked at the front weight and the right front connecting part of the construction machine by the 3rd modification of this invention from right to the left. It is a top view of the lower traveling body of the construction machine according to the 4th modification of this invention. It is sectional drawing at the XIV-XIV position of the lower traveling body shown in FIG. It is a figure which looked at the front side lower weight, the front side upper weight, and the right front connecting portion of the lower traveling body shown in FIG. 13 from the right side to the left side. It is a figure which looked at the right end portion of the front side lower weight and the front side upper weight, and the vicinity of the right front connecting portion of the lower traveling body shown in FIG. 13 from the front. FIG. 16 is a view of the right front connecting portion shown in FIG. 16 as viewed from above with the front lower weight and the front upper weight installed on the right front connecting portion removed. It is a top view (top view) of the front side lower weight of the lower traveling body in the 4th modification. FIG. 18 is a view of the front lower weight seen from the front in a state where the front lower weight shown in FIG. 18 is placed on the ground. FIG. 18 is a right side view of the front lower weight in a state where the front lower weight shown in FIG. 18 is placed on the ground. It is a right side view of the front side upper weight of the lower traveling body in 4th modification. It is a top view (top view) of the rear lower weight of the lower traveling body in the 4th modification.

Hereinafter, the configuration of the crane 1 as a construction machine according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6.

The crane 1 according to this embodiment is a so-called crawler crane. As shown in FIG. 1, the crane 1 includes an upper swing body 2, a lower traveling body 3, a boom 6, and a hanger 7.

The upper swivel body 2 is mounted on the lower traveling body 3 so as to be able to swivel around the vertical axis extending in the vertical direction.

The lower traveling body 3 is a crawler type and is configured to be self-propelled on the ground.

The boom 6 has a base end portion rotatably attached to the upper swing body 2 around an axis extending in the left-right direction of the upper swing body 2. The boom 6 is provided on the upper swivel body 2 so as to be undulating with the base end portion as a fulcrum. The boom 6 extends from the upper swing body 2 at an arbitrary undulation angle. The hanger 7 is hung from the tip of the boom 6 so as to be able to move up and down. A suspended load is suspended from the hanging tool 7, and the hanging work is performed by raising and lowering the boom 6 and raising and lowering the hanging tool 7 in that state.

Next, the lower traveling body 3 of the crane 1 according to the present embodiment will be described in more detail.

As shown in FIG. 2, the lower traveling body 3 has a car body 10, a left crawler unit 11, a right crawler unit 12, a front weight 13, and a rear weight 14. The "front side" of the lower traveling body 3 means a forward side which is one side of the traveling direction of the lower traveling body 3 and is set in advance in the lower traveling body 3, and is referred to as a "front side" of the lower traveling body 3. "Rear side" means the opposite side to the front side. Further, the "left side" of the lower traveling body 3 means the left side when the lower traveling body 3 is viewed from the rear side to the front side, and the "right side" of the lower traveling body 3 means the lower traveling body. It means the right side when the body 3 is viewed from the rear side to the front side.

The car body 10 is located in the center of the lower traveling body 3. The car body 10 supports the upper swivel body 2 from below so that the upper swivel body 2 (see FIG. 1) can swivel around the vertical axis. The car body 10 has a car body main body 40, a pair of left mounting portions 41, and a pair of right mounting portions 42.

The car body body 40 occupies most of the car body 10 and supports the upper swivel body 2 from below. The car body body 40 has a substantially rectangular parallelepiped shape.

The pair of left mounting portions 41 is a portion to which the left crawler frame 16 described later of the left crawler unit 11 is mounted. The pair of left mounting portions 41 are separately arranged at the front end and the rear end of the left end portion of the car body main body 40. The pair of left mounting portions 41 project to the left from the left end portion of the car body body 40.

The pair of right mounting portions 42 is a portion to which the right crawler frame 24 described later of the right crawler unit 12 is mounted. The pair of right mounting portions 42 are separately arranged at the front end and the rear end of the right end portion of the car body main body 40. The pair of right mounting portions 42 project to the right from the right end portion of the car body body 40.

The left crawler unit 11 and the right crawler unit 12 are traveling devices responsible for traveling the lower traveling body 3. The left crawler unit 11 and the right crawler unit 12 are arranged separately on the left and right sides of the car body 10 and are attached to the car body 10, respectively.

Specifically, the left crawler unit 11 includes a left crawler frame 16, a left crawler 17, and a left crawler drive device (not shown).

The left crawler frame 16 is a frame that supports the left crawler 17 via a driving wheel, a driven wheel, or the like (not shown) attached to the left crawler frame 16. The left crawler 17 surrounds the left crawler frame 16 and is driven by the left crawler drive device to orbit and generate propulsive force for traveling of the lower traveling body 3. The left crawler frame 16 has a left crawler frame main body 19, a left front connecting portion 20, and a left rear connecting portion 21.

The left crawler frame main body 19 is a portion that supports the left crawler 17 via the drive wheel, the driven wheel, and the like. The left crawler frame main body 19 is separably connected to a pair of left mounting portions 41 of the car body 10 and extends in the front-rear direction. The left crawler frame main body 19 is pin-coupled to each of the pair of left mounting portions 41 by connecting pins (not shown).

The left crawler frame 16 has a left crawler frame front portion 19a projecting forward from the front end of the car body 10 and a left crawler frame rear portion 19b projecting rearward from the rear end of the car body 10. The left crawler frame front portion 19a is composed of a portion of the left crawler frame main body 19 located on the front side of the front end of the car body 10 and the left front connecting portion 20. Further, the left crawler frame rear portion 19b is composed of a portion of the left crawler frame main body 19 located on the rear side of the rear end of the car body 10 and the left rear connecting portion 21.

The left front connecting portion 20 is a portion to be connected to the left end portion of the front weight 13. Further, the left rear connecting portion 21 is a portion to be connected to the left end portion of the rear weight 14.

The left front connecting portion 20 is a left front pedestal 43 on which the left end portion of the front weight 13 can be mounted, and supports the left end portion from below with the left end portion of the front weight 13 mounted, and the left front pedestal 43. It has a left front restraint portion 44 that restrains the movement of the left end portion of the front weight 13 mounted on the vehicle in the front-rear direction and to the left.

The left rear connecting portion 21 is a left rear pedestal 47 on which the left end portion of the rear weight 14 can be placed, and supports the left end portion from below with the left end portion of the rear weight 14 mounted. It has a left rear restraining portion 48 that restrains the movement of the left end portion of the rear weight 14 mounted on the left rear pedestal 47 in the front-rear direction and to the left.

The right crawler unit 12 includes a right crawler frame 24, a right crawler 25, and a right crawler drive device (not shown).

The right crawler frame 24 is a frame that supports the right crawler 25 via a driving wheel, a driven wheel, or the like (not shown) attached to the right crawler frame 24. The right crawler 25 surrounds the right crawler frame 24 and is driven by the right crawler drive device to move around to generate propulsive force for traveling of the lower traveling body 3. The right crawler frame 24 has a right crawler frame main body 27, a right front connecting portion 28, and a right rear connecting portion 29.

The right crawler frame main body 27 is a portion that supports the right crawler 25 via the drive wheel, the driven wheel, and the like. The right crawler frame body 27 is separably connected to a pair of right mounting portions 42 of the car body 10 and extends in the front-rear direction. The right crawler frame main body 27 is pin-coupled to each of the pair of right mounting portions 42 by connecting pins (not shown).

The right crawler frame 24 has a right crawler frame front portion 27a projecting forward from the front end of the car body 10 and a right crawler frame rear portion 27b projecting rearward from the rear end of the car body 10. The right crawler frame front portion 27a is composed of a portion of the right crawler frame main body 27 located on the front side of the front end of the car body 10 and the right front connecting portion 28. Further, the right crawler frame rear portion 27b is composed of a portion of the right crawler frame main body 27 located on the rear side of the rear end of the car body 10 and the right rear connecting portion 29.

The right front connecting portion 28 is a portion connected to the right end portion of the front weight 13. Further, the right rear connecting portion 29 is a portion to be connected to the right end portion of the rear weight 14.

The right front connecting portion 28 is a right front pedestal 30 on which the right end portion of the front weight 13 can be mounted, and supports the right end portion from below with the right end portion of the front weight 13 mounted, and the right front pedestal 30. It has a right front restraint portion 33 that restrains the movement of the right end portion of the front weight 13 mounted on the vehicle in the front-rear direction and to the right.

The right rear connecting portion 29 is a right rear pedestal 45 on which the right end portion of the rear weight 14 can be placed, and supports the right end portion from below with the right end portion of the rear weight 14 mounted. It has a right rear restraining portion 46 that restrains the movement of the right end portion of the rear weight 14 mounted on the right rear pedestal 45 in the front-rear direction and to the right.

The front weight 13 and the rear weight 14 are weights for improving the stability of the crane 1. The front weight 13 and the rear weight 14 are separately arranged in front of and behind the car body 10 between the left crawler frame main body 19 and the right crawler frame main body 27. The left end of the front weight 13 is fixed by the left front connecting portion 20, and the right end of the front weight 13 is fixed by the right front connecting portion 28. Further, the left end portion of the rear weight 14 is fixed by the left rear connecting portion 21, and the right end portion of the rear weight 14 is fixed by the right rear connecting portion 29.

The front weight 13 and the rear weight 14 have the same structure and are arranged in opposite directions. Further, a mounting structure of the left end portion of the front weight 13 with respect to the left front connecting portion 20, a mounting structure of the right end portion of the front side weight 13 with respect to the right front connecting portion 28, and a mounting structure of the left end portion of the rear side weight 14 with respect to the left rear connecting portion 21. And, the mounting structure of the right end portion of the rear weight 14 with respect to the right rear connecting portion 29 is the same. The attachment structure of the left end portion of the front weight 13 to the left front connecting portion 20 and the attachment structure of the right end portion of the front weight 13 to the right front connecting portion 28 are symmetrical with each other. Further, the attachment structure of the left end portion of the rear weight 14 to the left rear connecting portion 21 and the attachment structure of the right end portion of the rear weight 14 to the right rear connecting portion 29 are symmetrical with each other. Therefore, among these mounting structures, the mounting structure of the right end portion of the front weight 13 with respect to the right front connecting portion 28 will be described in detail below as an example.

The right end of the front weight 13 has a recess 50 that opens downward on its lower surface and opens to the right on its right side. The front weight 13 has a front weight body 13a that occupies most of the front weight 13 and a right end plate 13b that covers the right end surface of the front weight body 13a and is fixed to the right end surface thereof. The right end portion of the front weight 13 is composed of a right end portion of the front weight body 13a and a right end plate 13b. The right end of the front weight body 13a is provided with a rectangular parallelepiped recess 50a that opens downward on the lower surface thereof and opens to the right on the right end surface thereof. The right end plate 13b is provided with a notch 50b that penetrates the right end plate 13b in the left-right direction and opens downward to connect with the recess 50a. The recess 50 is formed by the notch 50b and the recess 50a. The cutout portion 50b has a mountain shape corresponding to the shape of the front-rear movement restraint portion 37 of the right front restraint portion 33 described later when viewed from the left-right direction. By fitting the front-rear movement restraint portion 37 into the notch portion 50b, the right end portion of the front weight 13 and the right front restraint portion 33 are mutually positioned in the front-rear direction.

As shown in FIG. 5, the right front pedestal 30 of the right front connecting portion 28 is fixed to the left side surface of the right crawler frame main body 27 so as to project to the left from the left side surface of the portion included in the right crawler frame front portion 27a. Has been done. As shown in FIGS. 4 and 6, the right front mount 30 has a pair of legs 31 and a mounting portion 32.

The pair of leg portions 31 is fixed to the left side surface of the portion of the right crawler frame main body 27 included in the right crawler frame front portion 27a, and extends further to the left from the left side surface. The pair of legs 31 are arranged at intervals in the front-rear direction.

The mounting portion 32 is a portion on which the right end portion of the front weight 13 is mounted. The mounting portion 32 is installed on the upper surface near the left end portion of the pair of leg portions 31 and is fixed to the pair of leg portions 31. The mounting portion 32 has a substrate portion 35 and a contact portion 36.

The substrate portion 35 has a flat plate shape. The substrate portion 35 is erected on a pair of leg portions 31 in a horizontally arranged state and fixed to the leg portions 31.

The contact portion 36 is a portion that abuts on the lower surface of the right end portion of the front weight 13 mounted on the mounting portion 32. The contact portion 36 has an elongated and thin plate shape as shown in FIGS. 5 and 6. The contact portion 36 is installed on the upper surface of the substrate portion 35 in a posture extending in the front-rear direction, and is fixed to the upper surface of the substrate portion 35. The contact portion 36 is arranged at a position near the center of the substrate portion 35 in the left-right direction.

The right front restraint portion 33 of the right front connecting portion 28 projects upward from the upper surface of the mounting portion 32 of the right front pedestal 30, and is convex to fit into the concave portion 50 at the right end of the front weight 13 mounted on the mounting portion 32. It is a department. By fitting the right front restraining portion 33 into the recess 50, the right front weight 13 restrains the movement of the right end portion in the front-rear direction and the left-right outward (right) movement, and the right crawler with respect to the front weight 13. It is coupled to the right end of the front weight 13 so as to prevent the front portion 27a of the frame from moving inward (to the left) in the left-right direction. The right front restraint portion 33 is installed on the right end portion of the mounting portion 32. The right front restraint portion 33 has a front-back movement restraint portion 37 and a right front movement restraint portion 38.

The front-back movement restraining portion 37 is a portion that restrains the movement of the right end portion of the front weight 13 in the front-rear direction. The front-back movement restraint portion 37 fits into the notch portion 50b of the recess 50. The front-back movement restraint portion 37 has a chevron-shaped plate shape. The front-back movement restraint portion 37 is erected on the upper surface of the mounting portion 32 in a posture orthogonal to the left-right direction. The front-back movement restraint portion 37 is installed along the right end edge of the mounting portion 32. With the right front restraint portion 33 fitted in the recess 50 of the front weight 13, the front end of the front-rear movement restraint portion 37 abuts on the lower end front portion of the inner surface of the recess 50, and the rear end of the front-rear movement restraint portion 37 abuts. It abuts on the rear portion of the lower end of the inner surface of the recess 50. As a result, the front-rear movement restraining portion 37 restrains the movement of the right end portion of the front weight 13 in the front-rear direction.

The right movement restraint portion 38 is a portion that restrains the movement of the right end portion of the front weight 13 to the right. The right movement restraint portion 38 is arranged perpendicular to the front-back movement restraint portion 37. The right movement restraint portion 38 is fixed to the left side surface of the front-back movement restraint portion 37 at the center position of the front-back movement restraint portion 37 in the front-rear direction, and is erected on the substrate portion 35 of the mounting portion 32. There is. With the right front restraint 33 fitted in the recess 50 of the front weight 13, the left end of the right movement restraint 38 is recessed at the lower end of the recess 50 of the front weight 13, as shown in FIG. It abuts on the right side surface in 50 from the right side, thereby restraining the movement of the right end portion of the front weight 13 to the right. Further, the right movement restraining portion 38 abuts on the right side surface in the recess 50 from the right side as described above, thereby preventing the right crawler frame front portion 27a from moving to the left with respect to the front weight 13.

Further, the right front restraint portion 33 has an upper side surface 33a which is a surface facing upward. The upper side surface 33a includes the upper side surface 37a of the front-back movement restraint portion 37 and the upper side surface 38a of the right-side movement restraint portion 38.

The upper side surface 37a of the front-rear movement restraint portion 37 has a front side inclined portion 37c that inclines downward from the central portion 37b in the front-rear direction of the upper side surface 37a toward the front, and a front side inclined portion 37c that inclines downward from the central portion 37b toward the rear. It has a rear inclined portion 37d that inclines toward. The front end of the front inclined portion 37c is located at the front end of the front-back movement restraint portion 37, and the rear end of the rear-side inclined portion 37d is located at the rear end of the front-back movement restraint portion 37.

Further, the upper side surface 38a of the right movement restraint portion 38 is located inside (left side) in the left-right direction with respect to the front side inclined portion 37c and the rear side inclined portion 37d of the upper side surface 37a of the front-back movement restraint portion 37. The upper side surface 38a of the right movement restraint portion 38 has an inner inclined portion 38b that inclines downward toward the inside (left side) in the left-right direction. The inner end (left end) of the inner inclined portion 38b in the left-right direction is located at the inner end (left end) of the right movement restraint portion 38 in the left-right direction, that is, the inner end (left end) of the right front restraint portion 33 in the left-right direction.

The structure similar to the right end portion and the right front connecting portion 28 of the front side weight 13 as described above is the structure of the left end portion and the left front connecting portion 20 of the front side weight 13, and the structure of the right end portion and the right rear connecting portion 29 of the rear side weight 14. , And the structure of the left end portion and the left rear connecting portion 21 of the rear weight 14, respectively.

That is, the left front connecting portion 20 is a left front pedestal 43 on which the left end portion of the front weight 13 can be placed, and the left front pedestal 43 that supports the left end portion from below with the left end portion of the front weight 13 mounted. It has a left front restraining portion 44 provided on the left front pedestal 43 and restraining the movement of the left end portion of the front weight 13 mounted on the left front pedestal 43 in the front-rear direction and to the left. The left front restraint portion 44 is coupled to the left end portion of the front weight 13 so as to prevent the left crawler frame front portion 19a from moving to the right with respect to the front weight 13.

Further, the left front restraint portion 44 is configured symmetrically with the right front restraint portion 33. The left front restraint portion 44 has a front-back movement restraint portion (s) and a left-right movement restraint portion (s) in which the front-rear movement restraint portion 37 and the right-right movement restraint portion 38 are inverted left and right. The front-rear movement restraint portion of the left front restraint portion 44 is a portion that restrains the movement of the left end portion of the front weight 13 in the front-rear direction. The left movement restraint portion of the left front restraint portion 44 is a portion that restrains the movement of the left end portion of the front weight 13 to the left.

Further, the right rear connecting portion 29 is a right rear pedestal 45 on which the right end portion of the rear weight 14 can be placed, and the right end portion is supported from below with the right end portion of the rear weight 14 mounted. The right rear restraint portion 46 that restrains the movement of the rear pedestal 45 and the right end portion of the rear weight 14 provided on the right rear pedestal 45 and mounted on the right rear pedestal 45 in the front-rear direction and to the right. And have. The right rear restraint portion 46 is coupled to the right end portion of the rear weight 14 so as to prevent the rear portion 27b of the right crawler frame from moving to the left with respect to the rear weight 14.

Further, the right rear restraint portion 46 is configured in the same manner as the right front restraint portion 33. The right rear restraint portion 46 has a front-back movement restraint portion similar to the front-back movement restraint portion 37 and a right-right movement restraint portion similar to the right rear movement restraint portion. The front-rear movement restraint portion of the right rear restraint portion 46 is a portion that restrains the movement of the right end portion of the rear weight 14 in the front-rear direction. The right rear movement restraint portion of the right rear restraint portion 46 is a portion that restrains the movement of the right end portion of the rear weight 14 to the right.

Further, the left rear connecting portion 21 is a left rear pedestal 47 on which the left end portion of the rear weight 14 can be placed, and the left end portion is supported from below with the left end portion of the rear weight 14 mounted. The left rear restraining portion 48 that restrains the movement of the rear pedestal 47 and the left end portion of the rear weight 14 provided on the left rear pedestal 47 and mounted on the left rear pedestal 47 in the front-rear direction and to the left. And have. The left rear restraint portion 48 is coupled to the left end portion of the rear weight 14 so as to prevent the left crawler frame rear portion 19b from moving to the right with respect to the rear weight 14.

Further, the left rear restraint portion 48 is configured in the same manner as the left front restraint portion 44. The left rear restraint portion 48 has a front-rear movement restraint portion similar to the front-rear movement restraint portion of the left front restraint portion 44 and a left movement restraint portion of the same illustration as the left front movement restraint portion of the left front restraint portion 44. Has a part. The front-rear movement restraint portion of the left rear restraint portion 48 is a portion that restrains the movement of the left end portion of the rear weight 14 in the front-rear direction. The left movement restraint portion of the left rear restraint portion 48 is a portion that restrains the left end portion of the rear weight 14 from moving to the left.

The left end of the front weight 13 is symmetrical with the right end of the front weight 13. The left end portion of the front weight 13 is composed of a left end portion of the front weight main body 13a and a left end plate (not shown) fixed to the left end surface of the left end portion thereof. The left end portion of the front weight 13 has a structure similar to that of the recess 50 at the right end portion of the front weight 13, and has a recess in the figure symmetrical to the recess 50. The left end portion of the front weight 13 is connected to the left front connecting portion 20 by inserting the left front restraining portion 44 into the concave portion thereof.

Further, the right end portion of the rear weight 14 is composed of a right end portion of the rear side weight body and a right end plate (not shown) fixed to the right end surface of the right end portion thereof, similarly to the right end portion of the front weight 13. There is. The right end portion of the rear side weight 14 has a concave portion (not shown) having the same structure as the concave portion 50 of the right end portion of the front weight 13. The right end portion of the rear side weight 14 is connected to the right rear connecting portion 29 by inserting the right rear restraining portion 46 into the concave portion thereof.

Further, the left end portion of the rear weight 14 is composed of a left end portion of the rear side weight body and a left end plate (not shown) fixed to the left end surface of the left end portion thereof, similarly to the left end portion of the front weight 13. There is. The left end portion of the rear side weight 14 has a structure similar to that of the recess 50 at the right end portion of the front weight 13, and has a concave portion (not shown) having a structure in which the concave portion 50 is inverted left and right. The left end portion of the rear weight 14 is connected to the left rear connecting portion 21 by inserting the left rear restraining portion 48 into the concave portion thereof.

The front weight 13 is sandwiched between the right front restraint portion 33 and the left front restraint portion 44, whereby movement in the left-right direction is restricted, and the right front restraint portion 33 and the recess 50 at the right end of the front weight 13 are restricted. The movement in the front-rear direction is also restrained by the fitting with the left front restraining portion 44 and the fitting of the left end portion of the front weight 13 with the recess in the drawing.

Further, the rear weight 14 is sandwiched between the right rear restraint portion 46 and the left rear restraint portion 48, whereby the movement in the left-right direction is restricted, and the right rear restraint portion 46 and the rear weight are restricted. The movement in the front-rear direction is also restrained by the fitting of the right end portion of the 14 with the not shown recess and the fitting of the left rear restraint portion 48 with the notably concave recess of the left end portion of the rear weight 14.

(Effect of this embodiment)
In the present embodiment, by utilizing the large weights of the front and rear weights 13 and 14, the vertical restraint of the front and rear weights 13 and 14 is omitted, and the front weight 13 to the right front pedestal 30 and the left front pedestal 43 is omitted. The front weight 13 can be fixed between the left and right crawler frames 16 and 24 only by the combination of the placement of the above and the restraint of the front weight 13 in the horizontal direction by the right front restraint 33 and the left front restraint 44, and the right rear mount 45 and the left. Only by combining the placement of the rear weight 14 on the rear mount 47 and the restraint of the rear weight 14 in the horizontal direction by the right rear restraint portion 46 and the left rear restraint portion 48, the rear side between the left and right crawler frames 16 and 24. The weight 14 can be fixed. Therefore, the front and rear weights 13 and 14 can be fixed between the left and right crawler frames 16 and 24 with a very simple operation.

Specifically, the front weights 13 and the rear weights 13 and 14 are simply placed on the left and right front mounts 43 and 30 and the rear weights 14 are placed on the left and right rear mounts 47 and 45. It is possible to omit the vertical restraint of the weights 13 and 14 by utilizing the heavy weight of. The movements of the front and rear weights 13 and 14 in the front-rear direction and the left-right direction other than the vertical direction are the restraint of the front weight 13 by the right front restraint portion 33 and the left front restraint portion 44 and the right rear restraint portion 46 and the left. This can be achieved by restraining the rear weight 14 by the rear restraint portion 48. Therefore, the front weights 13 are placed on the left and right front mounts 43 and 30, and the front weights 13 are restrained by the left and right front restraint portions 44 and 33, and the rear weights 14 are placed on the left and right rear mounts 47 and 45. The front and rear weights 13 and 14 can be fixed between the left and right crawler frames 16 and 24 by a very simple operation of placing and restraining the rear weights 14 with the left and right rear restraining portions 48 and 46.

Further, in the present embodiment, the front weight 13 and the rear weight 14 fixed between the left and right crawler frames 16 and 24 can be used as scaffolding. Therefore, even if an operator or the like does not descend from the left and right crawler units 11 and 12 to the ground once, he / she can move between the left and right crawler units 11 and 12 through the front weight 13 or the rear weight 14. Therefore, it is possible to facilitate the movement of workers and the like between the left and right crawler units 11 and 12.

Further, in the present embodiment, the bending load applied to the left and right crawler frames 16 and 24 when the lower traveling body 3 is turned to the left and right by the front weight 13 and the rear weight 14 fixed between the left and right crawler frames 16 and 24. Can counter against. Therefore, it is possible to reduce the bending moment in the left-right direction generated in the left and right crawler frames 16 and 24 when the lower traveling body 3 is turned.

Specifically, at the position of the left front connecting portion 20 which is the connecting point of the left crawler frame front portion 19a with respect to the front weight 13, the right bending load applied to the left crawler frame front portion 19a when the lower traveling body 3 is turned. At the position of the right front connecting portion 28, which is the connecting point of the right front crawler frame front portion 27a with respect to the front weight 13, the left bending load applied to the right crawler frame front portion 27a when the lower traveling body 3 is turned. Can counter against. That is, in the present embodiment, the arm length of the bending moment to the right of the left crawler frame front portion 19a is the length from the front end portion of the left crawler frame front portion 19a to the position of the left front connecting portion 20. The arm length of the bending moment to the left of the right crawler frame front portion 27a is the length from the front end portion of the right crawler frame front portion 27a to the position of the right front connecting portion 28. Therefore, the arm of the bending moment of the left crawler frame front portion 19a and the right crawler frame front portion 27a is compared with the case where the left crawler frame front portion 19a and the right crawler frame front portion 27a are not connected to the front weight 13, respectively. The length can be reduced. As a result, it is possible to reduce the right bending moment generated in the left crawler frame front portion 19a and the left bending moment generated in the right crawler frame front portion 27a when the lower traveling body 3 is turned. Further, for the same reason, the right bending moment generated in the left crawler frame rear portion 19b and the left bending moment generated in the right crawler frame rear portion 27b at the turn of the lower traveling body 3 can be reduced.

From the above, in the present embodiment, it is easy for the operator and the like to move between the left and right crawler units 11 and 12, and the left and right crawler frames 16 and 24 are bent in the left-right direction when the lower traveling body 3 is turned. The front and rear weights 13 and 14 can be fixed between the left and right crawler frames 16 and 24 with a simple operation while achieving a reduction in moment.

Further, in the present embodiment, the left end portion of the front weight 13 is placed on the left front pedestal 43, and at the same time, the convex portion of the left front restraint portion 44 is fitted into the concave portion of the left end portion of the front weight 13 from the lower side to fit the front weight 13. It is possible to restrain the movement of the left end of the body in the front-back direction and to the left. Further, the right end portion of the front weight 13 is placed on the right front mount 30, and at the same time, the convex portion of the right front restraint portion 33 is fitted into the concave portion 50 of the right end portion of the front weight 13 from the lower side to fit the convex portion of the right front restraint portion 33 to the right end portion of the front weight 13. It can restrain movement in the front-back direction and to the right. Therefore, it is possible to simplify the work of restraining the left and right ends of the front weight 13.

Further, in the present embodiment, the left end portion of the rear weight 14 is placed on the left rear pedestal 47, and at the same time, the convex portion of the left rear restraint portion 48 is fitted into the concave portion of the left end portion of the rear weight 14 from the lower side. The left end of the rear weight 14 can be restrained from moving in the front-rear direction and to the left, and the right end of the rear weight 14 is placed on the right rear frame 45 and at the same time lowered into the recess of the right end of the rear weight 14. The convex portion of the right rear restraining portion 46 can be fitted from the side to restrain the movement of the right end portion of the rear weight 14 in the front-rear direction and to the right. Therefore, it is possible to simplify the work of restraining the left and right ends of the rear weight 14.

Further, in the present embodiment, the upper side surface 37a of the front-rear movement restraint portion 37 of the right front restraint portion 33 is inclined downward from the central portion 37b toward the front, and the front inclined portion 37c and the central portion 37b to the rear. It has a rear inclined portion 37d that inclines downward as it goes toward it. Therefore, when the right end portion of the front weight 13 is placed on the right front pedestal 30, the recess 50 at the right end portion of the front weight 13 is displaced in the front-rear direction with respect to the right front restraint portion 33, and is in front of the recess 50. Even when the edge or the trailing edge abuts on the upper side surface 37a of the front-rear movement restraint portion 37, the right end portion of the front weight 13 is recessed due to the inclination of the front inclined portion 37c and the rear inclined portion 37d of the upper side surface 37a. The 50 can be guided to a position where the right front restraint portion 33 is fitted, and the recess 50 at the right end portion of the front weight 13 and the right front restraint portion 33 can be fitted without any trouble.

Specifically, when the right end portion of the front weight 13 is placed on the right front gantry 30, the recess 50 at the right end portion of the front weight 13 is displaced forward with respect to the right front restraint portion 33, and the recess 50 When the trailing edge abuts on the rear inclined portion 37d of the upper side surface 37a of the front-rear movement restraint portion 37, the right end portion of the front weight 13 moves downward along the inclination of the rear inclined portion 37d and rearward. The right end portion of the front weight 13 can be guided to a position where the recess 50 is displaced to and fits with the right front restraint portion 33. Further, when the right end portion of the front weight 13 is placed on the right front gantry 30, the recess 50 at the right end portion of the front weight 13 is displaced rearward with respect to the right front restraint portion 33, and the leading edge of the recess 50 is displaced. When the vehicle abuts on the front inclined portion 37c of the upper side surface 37a of the front-rear movement restraining portion 37, the right end portion of the front weight 13 is displaced forward while moving downward along the inclination of the front inclined portion 37c. The right end portion of the front weight 13 can be guided to a position where the recess 50 fits with the right front restraint portion 33.

Further, in the present embodiment, the upper side surface of the front-rear movement restraint portion of the left front restraint portion 44, the upper side surface of the front-rear movement restraint portion of the right rear restraint portion 46, and the upper side surface of the front-rear movement restraint portion of the left rear restraint portion 48 are right front. It is configured in the same manner as the upper side surface 37a of the front-back movement restraint portion 37 of the restraint portion 33. Therefore, as in the case of fitting the recess 50 at the right end of the front weight 13 and the right front restraint 33, the front-rear direction when the recess at the left end of the front weight 13 and the left front restraint 44 are fitted. Positional deviation, positional deviation in the front-rear direction when the concave portion at the right end of the rear weight 14 and the right rear restraint portion 46 are fitted, and the concave portion at the left end portion of the rear weight 14 and the left rear restraint portion 48. It is possible to eliminate the positional deviation in the front-rear direction at the time of fitting and to perform the fitting without any trouble.

Further, in the present embodiment, the upper side surface 38a of the right movement restraint portion 38 of the right front restraint portion 33 has an inner inclined portion 38b that inclines downward as it goes inward (leftward) in the left-right direction. Therefore, when the right end portion of the front weight 13 is placed on the right front mount 30, the recess 50 at the right end portion of the front weight 13 is displaced outward (to the right) in the left-right direction with respect to the right front restraint portion 33. Even when the inner edge (left side edge) of the concave portion 50 in the left-right direction abuts on the inner inclined portion 38b, the concave portion 50 restrains the right end portion of the front weight 13 by the inclination of the inner inclined portion 38b. It can be guided to a position where it fits with the portion 33, and the recess 50 at the right end of the front weight 13 and the right front restraint portion 33 can be fitted without any trouble.

Specifically, the recess 50 at the right end of the front weight 13 is displaced outward (to the right) in the left-right direction with respect to the right front restraint portion 33, and the inner edge (left edge) in the left-right direction of the recess 50 is displaced. When it comes into contact with the inner inclined portion 38b, the right end portion of the front weight 13 moves downward along the inclination of the inner inclined portion 38b and is displaced inward (leftward) in the left-right direction to form the recess 50. The right end portion of the front weight 13 can be guided to a position where the right front restraint portion 33 is fitted.

Further, in the present embodiment, the upper side surface of the left movement restraint portion of the left front restraint portion 44 is symmetrical with the upper side surface of the right movement restraint portion 38 of the right front restraint portion 33. Therefore, although it is symmetrical with the case where the concave portion 50 at the right end of the front weight 13 and the right front restraint portion 33 are fitted, when the concave portion at the left end portion of the front weight 13 and the left front restraint portion 44 are fitted. Even when the left end portion of the front weight 13 is displaced outward (to the left) in the left-right direction with respect to the left front restraint portion 44, the displacement in the left-right direction is eliminated by the same action as described above. The recessed portion at the left end of the front weight 13 and the left front restraint portion 44 can be fitted without any trouble.

Further, the upper side surface of the right movement restraint portion of the right rear restraint portion 46 is configured in the same manner as the upper side surface 38a of the right movement restraint portion 38 of the right front restraint portion 33, and the left movement restraint portion of the left rear restraint portion 48. The upper side surface is configured in the same manner as the upper side surface of the left movement restraint portion of the left front restraint portion 44. Therefore, when the concave portion at the right end of the rear weight 14 and the right rear restraint portion 46 are fitted, the right end portion of the rear weight 14 moves outward (to the right) in the left-right direction with respect to the right rear restraint portion 46. The left end of the rear weight 14 is outside in the left-right direction with respect to the left rear restraint 48 when the position is misaligned or when the concave portion at the left end of the rear weight 14 and the left rear restraint 48 are fitted. If the position is displaced to the (left) side, the displacement in the left-right direction is eliminated and the concave portion at the right end of the rear weight 14 and the right rear restraint portion 46 are fitted and the rear side is displaced in the same manner as above. The recessed portion at the left end of the weight 14 and the left rear restraining portion 48 can be fitted without any trouble.

(Modification example)
The construction machine according to the present invention is not necessarily limited to the above-mentioned structure. For example, the following configurations can be adopted for the construction machine according to the present invention.

(1) The recess 50 at the right end of the front weight 13 and the recess at the left end of the front weight 13 may each penetrate the front weight 13 up and down. Further, the recess at the right end of the rear weight 14 and the recess at the left end of the rear weight 14 may each penetrate the rear weight 14 up and down. FIG. 7 is a view of the front weight 13 and the right front connecting portion 28 in the first modification of the present invention in which such a configuration is adopted, as viewed from right to left. Further, FIG. 8 is a cross-sectional view of the right end portion of the front weight 13 and the right front connecting portion 28 shown in FIG. 7 at the VIII-VIII position. Further, FIG. 9 is a view of the right end portion and the right front connecting portion 28 of the front weight 13 shown in FIG. 7 as viewed from above.

In this first modification, the recess 50 at the right end of the front weight 13 is open on the lower surface of the front weight 13, and also penetrates the front weight 13 in the vertical direction on the upper surface of the front weight 13. It is open. The recess 50 is also open on the left side surface of the front weight 13. Further, the right front restraint portion 33 of the right front connecting portion 28 has a vertical dimension larger than the vertical dimension of the right front restraint portion 33 in the embodiment. With the right front restraint portion 33 fitted in the recess 50 at the right end of the front weight 13, the upper part of the right front restraint portion 33 is an open space. The upper part of the right front restraint portion 33 does not necessarily have to be open, and may be closed.

Further, in this first modification, the front-back movement restraint portion 37 of the right front restraint portion 33 is vertically longer than the front-back movement restraint portion 37 in the embodiment. The front inclined portion 37c of the upper side surface 37a of the front-rear movement restraining portion 37 in the first modification is curved and inclined downward as it goes forward. The rear inclined portion 37d of the upper side surface 37a of the front-rear movement restraining portion 37 in the first modification is curved and inclined downward as it goes backward. Due to the inclination of the front inclined portion 37c and the rear inclined portion 37d, the recess 50 is fitted with the right front restraining portion 33 even if there is a positional deviation in the front-rear direction when the recess 50 and the right front restraining portion 33 are fitted. The right end portion of the front weight 13 can be guided to the position where the weight is to be moved, and the misalignment can be eliminated so that the recess 50 and the right front restraint portion 33 can be fitted without any trouble. This action is the same as the action due to the inclination of the front inclined portion 37c and the rear inclined portion 37d in the embodiment.

Further, in this first modification, the right movement restraint portion 38 of the right front restraint portion 33 is vertically longer than the right movement restraint portion 38 in the above embodiment, but has the same function. The upper side surface 38a of the right movement restraint portion 38 of the first modification has an inner inclined portion 38b that inclines downward toward the inside (left side) in the left-right direction. Therefore, even if the recess 50 is displaced outward (to the right) in the left-right direction with respect to the right front restraint portion 33 when the recess 50 and the right front restraint portion 33 are fitted, the inner inclined portion 38b Due to the inclination, the right end portion of the front weight 13 can be guided to the position where the recess 50 fits with the right front restraint portion 33. Therefore, the positional deviation in the left-right direction can be eliminated, and the recess 50 and the right front restraint portion 33 can be fitted without any trouble. This action is the same as the action due to the inclination of the inner inclined portion 38b in the above embodiment.

In the first modification, the same configuration as the recess 50 at the right end of the front weight 13 and the right front connecting portion 28 has the same configuration as the recess at the left end of the front weight 13 and the left front connecting portion 20, and the right end portion of the rear weight 14. It may be applied to the concave portion and the right rear connecting portion 29 of the above, and the concave portion and the left rear connecting portion 21 of the left end portion of the rear weight 14, respectively.

(2) Further, the right front restraint portion 33 connects the right end portion of the front weight 13 mounted on the right front pedestal 30 and the right front pedestal 30, and the right end of the front weight 13 mounted on the right front pedestal 30. It may be a restraining pin that restrains the movement of the portion in the front-rear direction and the left-right direction. Further, the left front restraint portion 44 connects the left end portion of the front weight 13 mounted on the left front mount 43 and the left front mount 43, and the front and rear of the left end portion of the front weight 13 mounted on the left front mount 43. It may be a restraint pin that restrains the movement in the direction and the left-right direction. Further, the right rear restraint portion 46 connects the right end portion of the rear weight 14 mounted on the right rear pedestal 45 and the right rear pedestal 45, and the rear weight placed on the right rear pedestal 45. It may be a restraint pin that restrains the movement of the right end portion of 14 in the front-rear direction and the left-right direction. Further, the left rear restraint portion 48 connects the left end portion of the rear weight 14 mounted on the left rear pedestal 47 and the left rear pedestal 47, and the rear weight placed on the left rear pedestal 47. It may be a restraint pin that restrains the movement of the left end portion of 14 in the front-rear direction and the left-right direction.

FIG. 10 is a view of the right end portion and the right front connecting portion 28 of the front weight 13 in the second modification of the present invention in which the right front restraint portion 33 is the restraint pin 53, as viewed from above. Further, FIG. 11 is a view of the right end portion and the right front connecting portion 28 of the front weight 13 shown in FIG. 10 as viewed from the front.

In the second modification, the front weight 13 has a front weight body 51 and an end mounting portion 52 projecting to the right from the lower end of the right end surface of the front weight body 51. The end mounting portion 52 corresponds to the right end portion of the front weight 13, and is an example of the weight end portion in the present invention. The end mounting portion 52 has two weight through holes 52a that vertically penetrate the end mounting portion 52. The two weight through holes 52a are arranged side by side in the front-rear direction.

The right front pedestal 30 of the right front connecting portion 28 has two pedestal through holes 35a that vertically penetrate the right front pedestal 30. The right front pedestal 30 is an example of the crawler frame pedestal in the present invention. The two pedestal through holes 35a are provided in the substrate portion 35 of the mounting portion 32 of the right front pedestal 30 and penetrate the substrate portion 35 up and down. More specifically, the substrate portion 35 has a portion that overlaps with the end mounting portion 52 when the right end portion of the front weight 13 is mounted on the mounting portion 32, and two pedestal through holes 35a are provided in that portion. Is provided. The two pedestal through holes 35a are arranged side by side in the front and back in the area between the pair of legs 31.

The right front restraint portion 33 is inserted into the two weight through holes 52a and the two gantry through holes 35a, and the end mounting portion 52 of the right end portion of the front weight 13 mounted on the right front gantry 30. It is composed of two restraint pins 53 that restrain the movement of the above in the front-back direction and the left-right direction. The two weight through holes 52a match the two weight through holes 35a in a state where the left end portion of the front weight 13 is placed on the mounting portion 32 of the right front gantry 30, and in that state, each weight penetrates. The restraint pin 53 is inserted from above into the hole 52a and the corresponding gantry through hole 35a. The restraint pin 53 inserted in this way restrains the movement of the right end portion of the front weight 13 mounted on the right front mount 30 in the front-rear direction and the left-right direction.

Further, in this second modification, two right front connecting portions 28 are provided at two positions separated from each other in the front and rear of the right front crawler frame front portion 27a, and the right front connecting portions 28 are similarly configured. Further, two end mounting portions 52 are provided at two positions separated from each other in the front and rear at the right end portion of the front weight 13 so as to correspond to the two right front connecting portions 28, and the end mounting portions 52 are similarly provided. It is configured. Then, the two end mounting portions 52 and the right front pedestal 30 of each of the two right front connecting portions 28 are connected by the restraint pin 53 as described above.

The same structure as the connection structure by the restraint pin 53 as described above is the connection between the left end of the front weight 13 and the left front pedestal 43, the connection between the right end of the rear weight 14 and the right rear pedestal 45, and the rear side. It may be applied to the connection between the left end portion of the weight 14 and the left rear frame 47. Further, the right end portion of the front weight 13 may be connected to three or more right front mounts 30 arranged in the front-rear direction by a connection structure using the same restraint pin 53, and the left end portion of the front weight 13 may be connected to the three or more positions arranged in the front-rear direction. It may be connected to the left front pedestal 43 of the above by a connection structure by a similar restraint pin 53. Further, the right end portion of the rear weight 14 may be connected to three or more right rear mounts 45 arranged in the front-rear direction by a similar restraining pin 53, and the left end portion of the rear weight 14 is arranged in the front-rear direction. It may be connected to the left rear pedestal 47 at three or more places by the same connection structure by the restraint pin 53.

In this second modification, the restraint pin 53 can restrain the movement of the right end portion of the front weight 13 in the front-rear direction and also can restrain the movement of the right end portion of the front weight 13 on both the left and right sides. Therefore, the horizontal movement of the right end portion of the front weight 13 can be restrained more stably. Further, the same connection structure by the restraint pin 53 is applied to the connection between the left end portion of the front side weight 13 and the left front pedestal 43, the connection between the right end portion of the rear side weight 14 and the right rear pedestal 45, and the left end of the rear side weight 14. When applied to the connection between the portion and the left rear mount 47, the horizontal movement of the left end portion of the front weight 13, the horizontal movement of the right end portion of the rear weight 14, and the left end portion of the rear weight 14. The horizontal movement of the can be restrained more stably.

(3) Further, in the configuration of the embodiment and the first modification, a plurality of right front connecting portions 28 arranged in the front-rear direction are provided on the front portion 27a of the right crawler frame, and a plurality of right front connecting portions 28 are provided in the front-rear direction on the right end portion of the front weight 13. The recesses 50 at the locations are provided, and the right end portion of the front weight 13 is connected to the front portion 27a of the right crawler frame by fitting the right front restraint portions 33 of the right front connecting portions 28 at the plurality of locations and the recesses 50 at the plurality of locations. May be done. Similarly, in the configuration of the embodiment and the first modification, the left end portion of the front weight 13 and the left crawler frame front portion 19a are connected at a plurality of places, and the right end portion of the rear weight 14 and the right crawler frame are connected. The rear portion 27b may be connected at a plurality of locations, and the left end portion of the rear weight 14 and the left crawler frame rear portion 19b may be connected at a plurality of locations.

(4) Further, the right front restraining portion 33 of the right front connecting portion 28 may restrain the movement of the right end portion of the front weight 13 in the front-rear direction by sandwiching the right end portion of the front weight 13 from both front and rear sides. .. FIG. 12 is a view of the front weight 13 and the right front connecting portion 28 in the third modification of the present invention in which such a configuration is adopted, as viewed from right to left.

Specifically, in this third modification, the right front connecting portion 28 includes a front right front connecting portion 28a and a rear right front connecting portion 28b which are separately arranged in front of and behind the right end portion of the front weight 13. The front right front connecting portion 28a has a front right front restraining portion 33b and a front right front pedestal 30a. The rear right front connecting portion 28b has a rear right front restraining portion 33c and a rear right front pedestal 30b. The right front restraint portion 33 is arranged on the front side of the right end portion of the front weight 13, and restrains the forward movement of the right end portion of the front weight 13, the front right front restraint portion 33b and the right end portion of the front weight 13. It is composed of the rear right front restraining portion 33c which is arranged on the rear side and restrains the rearward movement of the right end portion of the front weight 13. The right front restraint portion 33 restrains the movement of the right end portion of the front weight 13 in the front-rear direction by sandwiching the right end portion of the front weight 13 from both front and rear sides by the front right front restraint portion 33b and the rear right front restraint portion 33c. ..

Further, in this third modification, the right front pedestal 30 is arranged on the front side of the right end portion of the front weight 13, and the front right front pedestal 30a on which the front end portion of the right end portion of the front weight 13 is placed and the front weight. It is composed of the rear right front pedestal 30b arranged on the rear side of the right end portion of 13 and on which the rear end portion of the right end portion of the front weight 13 is placed. The right front pedestal 30 supports the right end portion of the front weight 13 from below by the front right front pedestal 30a and the rear right front pedestal 30b. The front right front restraint portion 33b is provided so as to project upward from the upper surface of the mounting portion 32 of the front right front gantry 30a. The rear right front restraint portion 33c is provided so as to project upward from the upper surface of the mounting portion 32 of the rear right front frame 30b.

Further, in this third modification, the cut is inclined so that the front lower end portion 13c and the rear lower end portion 13d of the right end portion of the front weight 13 are inclined toward the center of the right end portion of the front weight 13 in the front-rear direction as they go downward. It is lacking. Then, the front end portion of the right end portion of the front weight 13 is mounted on the mounting portion 32 of the front right front pedestal 30a, and the rear end portion of the right end portion of the front weight 13 is mounted on the mounting portion 32 of the rear right front pedestal 30b. In the mounted state, the front right front restraint portion 33b abuts on the front lower end portion 13c of the right end portion of the front weight 13 to restrain the forward movement of the right end portion of the front weight 13 and the rear right front restraint portion 33c. Contact the rear lower end portion 13d of the right end portion of the front weight 13 and restrains the backward movement of the right end portion of the front weight 13. The contact surface 33d of the front right front restraint portion 33b that abuts on the front lower end portion 13c of the right end portion of the front weight 13 is a slope along the inclination of the front lower end portion 13c. The contact surface 33e of the rear right front restraint portion 33c that abuts on the rear lower end portion 13d of the right end portion of the front weight 13 is a slope along the inclination of the rear lower end portion 13d.

Further, although not shown, in this third modification, the left front connecting portion is configured in the same manner as the right front connecting portion 28, and the front left front connecting portion is separately arranged in front of and behind the left end portion of the front weight 13. And the rear left front connecting part. The front left front connecting portion is configured in the same manner as the front right front connecting portion 28a, and the rear left front connecting portion is configured in the same manner as the rear right front connecting portion 28b. The front lower end of the left end of the front weight 13 is provided with a notch similar to the front lower end 13c of the right end of the front weight 13, and the front lower end of the left end of the front weight 13 is provided with a front weight. A notch similar to the rear lower end portion 13d of the right end portion of 13 is provided. The left front restraint portion of the left front connecting portion is configured in the same manner as the front right front restraint portion 33b, and has a front left front restraint portion that fits the notch provided at the front lower end portion of the left end portion of the front weight 13 and the rear. It is configured in the same manner as the side right front restraint portion 33c, and is composed of a rear left front restraint portion that fits the notch provided in the rear lower end portion of the left end portion of the front weight 13. The left front restraint portion of the left front connecting portion restrains the movement of the left end portion of the front weight 13 in the front-rear direction by sandwiching the left end portion of the front weight 13 from both front and rear sides by these front left front restraint portions and the rear left front restraint portion. do.

Further, although not shown, the front right front restraint portion 33b and the rear right front restraint portion 33c sandwich the right end portion of the front weight 13 from both front and rear sides as described above in the front-rear direction of the right end portion of the front weight 13. A structure similar to the structure for restraining the movement of the front weight 13 may be adopted for the structure for restraining the movement of the front weight 13 in the left-right direction. In this case, specifically, when the front weight 13 is viewed from the front, the front weight 13 is directed toward the inside (center side) in the left-right direction toward the lower ends of the right end and the left end of the front weight 13. A notch is provided so as to be inclined. The right front restraint portion has a right front restraint portion that fits the notch provided at the lower end portion of the right end portion of the front weight 13 and restrains the movement of the right end portion of the front weight 13 to the right. The restraint portion has a left side restraint portion that fits the notch provided at the lower end portion of the left end portion of the front weight 13 and restrains the left end portion of the front weight 13 from moving to the left. By sandwiching the front weight 13 from both the left and right sides by the left side restraint portion and the right side restraint portion, the movement of the front side weight 13 in the left-right direction is restrained.

The same configuration as described above is applied to the connection between the right end portion of the rear weight 14 and the right rear connecting portion 29, and the connection between the left end portion of the rear weight 14 and the left rear connecting portion 21. May be good. That is, the right rear restraint portion of the right rear connecting portion 29 is composed of a front right rear restraint portion similar to the front right front restraint portion 33b and a rear right rear restraint portion similar to the rear right front restraint portion 33c. The movement of the right end portion of the rear weight 14 in the front-rear direction may be restrained by sandwiching the right end portion of the rear weight 14 from both the front and rear sides by the front right rear restraint portion and the rear right rear restraint portion. Further, the left rear restraint portion of the left rear connecting portion 21 is composed of a front left rear restraint portion similar to the front left front restraint portion and a rear left rear restraint portion similar to the rear left front restraint portion. The movement of the left end portion of the rear weight 14 in the front-rear direction may be restrained by sandwiching the left end portion of the rear weight 14 from both the front and rear sides by the front left rear restraint portion and the rear left rear restraint portion. Further, the right rear restraint portion has the same right side restraint portion as the right side restraint portion of the right front restraint portion, and the left rear restraint portion has the same left side restraint portion as the left side restraint portion of the left front restraint portion, and the right side thereof. The movement of the rear weight 14 in the left-right direction may be constrained by sandwiching the rear weight 14 from both the left and right sides by the right restraint portion of the rear restraint portion and the left restraint portion of the left rear restraint portion.

(5) Further, the construction machine according to the present invention is not necessarily limited to the crawler crane, and may be a hydraulic excavator or other crawler type construction machine.

(6) Further, in the construction machine according to the present invention, the front weight is not only mounted on the right front frame and the left front frame, but also fixed to the front part of the right crawler frame and the front part of the left crawler frame. May be done. Further, the rear weight is not only mounted on the right rear pedestal and the left rear pedestal, but may also be fixed to the rear part of the right crawler frame and the rear part of the left crawler frame. In this case, for example, a fixing bracket is provided at the right end of the front weight, and a fixing connecting portion for connecting to the fixing bracket is provided at the front of the right crawler frame separately from the right front connecting portion, and is fixed to the fixing bracket. The right end of the front weight may be fixed to the front of the right crawler frame by connecting the connecting portion with a connecting member such as a pin or a bolt. As the fixing bracket provided at the right end of the front weight, the same one as the end mounting portion 52 in the second modification may be applied, and the second modification may be applied as the fixing connecting portion provided at the front of the right crawler frame. The same as the right front connecting portion 28 in the example may be applied.

The same connection structure as the connection structure between the fixing bracket and the fixing connection part as described above is the fixing of the left end of the front weight to the front part of the left crawler frame and the fixing of the right end part of the rear weight to the rear part of the right crawler frame. , And fixing the left end of the rear weight to the rear of the left crawler frame, respectively. Further, the fixing connecting portions provided at the front of the right crawler frame, the front of the left crawler frame, the rear of the right crawler frame and the rear of the left crawler frame are the right front connecting portion, the left front connecting portion, the right rear connecting portion and the left rear connecting portion. Of these, it may be provided integrally with the one provided at the corresponding location.

(7) Further, in the above-described embodiment, the front weight 13 is configured by mutually coupling the front weight body 13a, the right end plate 13b, and the left end plate (not shown), but the front weight according to the present invention is. , The shape of the front weight 13 formed by the front weight main body 13a, the right end plate 13b, and the left end plate in the above embodiment may be integrally formed. In this case, the recess at the right end of the front weight has the same shape as the recess 50 formed by the recess 50a formed in the front weight body 13a and the notch 50b formed in the right end plate 13b in the embodiment, and is integrally formed. It may be formed at the right end of the molded front weight, and the same applies to the recess at the left end of the front weight. Similarly, the rear weight according to the present invention may be integrally molded, and the concave portions of the right end portion and the left end portion of the rear side weight are integrally formed with the right end of the rear side weight. It may be formed in a portion and a left end portion, respectively.

(8) Further, the abutting portion of the mounting portion of each pedestal on which the left and right end portions of the front and rear weights according to the present invention are mounted is like the abutting portion 36 of the embodiment shown in FIG. It is not always limited to an elongated shape when viewed from above. For example, the contact portion may have an elliptical shape or other shape when viewed from above, and a plurality of circular contact portions are predetermined on the substrate portion of the mounting portion when viewed from above. They may be arranged in an array or arranged so as to be scattered.

(9) Further, in the embodiment and the modification, in the right front restraint portion 33, the right movement restraint portion 38 is formed separately from the front-back movement restraint portion 37 and fixed to the front-back movement restraint portion 37. However, the right movement restraint portion may be integrally formed with the front-back movement restraint portion. The same applies to the left front restraint portion, the right rear restraint portion, and the left rear restraint portion.

(10) Further, the width of the right front movement restraint portion 33 of the right front restraint portion 33 in the front-rear direction may be set to an arbitrary width equal to or less than the width of the front-back movement restraint portion 37 in the front-rear direction. For example, the width of the right movement restraint portion 38 in the front-rear direction may be larger than the width of the right movement restraint portion 38 in the front-rear direction shown in FIG. 6 of the embodiment. It may be equal to the width in the front-back direction of. The width of the left movement restraint portion of the right front restraint portion 33 in the front-rear direction, the width of the right rear movement restraint portion of the left rear restraint portion 48 in the front-rear direction, and the front-rear direction of the left rear movement restraint portion of the right rear restraint portion 46. The same applies to the width.

(11) The upper side surface 33a of the right front restraint portion 33 has a front inclined portion 37c and a rear inclined portion 37d, while the inner inclined portion 38b does not necessarily have. That is, in this case, the upper side surface 38a of the right movement restraint portion 38, which is a part of the upper side surface 33a of the right front restraint portion 33, does not necessarily have to be inclined downward as it goes inward in the left-right direction. For example, it may have a shape extending flat in the horizontal direction or a shape other than that. Further, the upper side surface 33a of the right front restraint portion 33 has an inner inclined portion 38b, while the front inclined portion 37c and the rear inclined portion 37d do not necessarily have. That is, in this case, the upper side surface 37a of the front-rear movement restraint portion 37, which is a part of the upper side surface 33a of the right front restraint portion 33, does not necessarily have to be inclined from the central portion 37b on both front and rear sides, for example, horizontally. It may have a shape extending horizontally in the direction or a shape other than that. The same applies to the upper side surface of the left front restraint portion 44, the upper side surface of the right rear restraint portion 46, and the upper side surface of the left rear restraint portion 48.

(12) Further, the crawler frame restraining portion in the present invention has a protrusion connecting portion provided with an insertion hole into which a weight end protrusion protruding downward from the weight main body end can be inserted from above. By coupling the joint with the weight end protrusion so as to restrain the movement of the weight end protrusion inserted into the insertion hole in the front-rear direction and the left-right direction, the corresponding weight end protrusion in the front-rear direction and the corresponding weight end protrusion can be restrained. It may restrain the movement in the left-right direction. 13 to 22 show a configuration according to a fourth modification of the present invention in which such a crawler frame restraint portion is adopted.

Specifically, as shown in FIGS. 13 and 14, the lower traveling body 3 of the crane 1 according to the fourth modification has a front lower weight 61, a front upper weight 62, a rear lower weight 71, and a rear side. It has an upper weight 72 and. The front lower weight 61 is an example of the front weight in the present invention, and the rear lower weight 71 is an example of the rear weight in the present invention.

As shown in FIG. 19, the front lower weight 61 has a front lower weight main body 63, a front weight right end protrusion 64, and a front weight left end protrusion 65.

The front lower weight body 63 has a plate shape extending in the left-right direction. As shown in FIG. 14, the right end portion of the front lower weight body 63 is placed on the right front pedestal 30 of the right crawler frame front portion 27a. The left end portion of the front lower weight body 63 is placed on the left front pedestal 43 of the left crawler frame front portion 19a. The right end portion and the left end portion of the front lower weight main body 63 are examples of the weight main body end portions in the present invention.

As shown in FIG. 19, the front side weight right end protrusion 64 projects downward from the lower surface of the right end portion of the front side lower weight main body 63. The right end protrusion 64 of the front weight is an example of the weight end protrusion in the present invention. The protrusion 64 at the right end of the front weight has a round bar shape. The front weight right end protrusion 64 has a tapered portion 64a whose diameter becomes smaller toward the tip in the protruding direction of the front weight right end protrusion 64 from the front lower weight main body 63.

The front left end protrusion 65 projects downward from the lower surface of the left end of the front lower weight body 63. The left end protrusion 65 of the front weight is an example of the weight end protrusion in the present invention. The left end protrusion 65 of the front weight is arranged at a position symmetrical with the right end protrusion 64 of the front weight with respect to the center of the front lower weight main body 63 in the left-right direction. The left end protrusion 65 of the front weight has the same shape as the right end protrusion 64 of the front weight, and the tapered portion 65a whose diameter becomes smaller toward the tip of the left end protrusion 65 of the front weight from the lower front weight body 63. Has. The amount of protrusion of the front weight left end protrusion 65 from the lower surface of the front lower weight body 63 is equal to the amount of protrusion of the front weight right end protrusion 64 from the lower surface of the front lower weight body 63.

Further, in this fourth modification, the right front pedestal 30 of the right crawler frame front portion 27a supports the right end portion of the front side lower weight 61 from below in a state where the right end portion of the front side lower weight 61 is placed on the right front frame 30. .. The right front pedestal 30 is an example of the crawler frame pedestal in the present invention. On the right front pedestal 30, the right end portion of the front side lower weight body 63 among the right end portions of the front side lower weight 61 is placed. As shown in FIGS. 15 to 17, the right front pedestal 30 has a pair of legs 31 similar to the pair of legs 31 of the right front pedestal 30 in the embodiment and a right front mounted on the pair of legs 31. It has a rest 81 and.

The right front mounting portion 81 is a portion on which the right end portion of the front lower weight main body 63 is mounted. The right front mounting portion 81 has a flat plate shape extending in the front-rear direction. The right front mounting portion 81 is installed on the upper surface near the left end portion of the pair of leg portions 31 and is fixed to the pair of leg portions 31.

Further, in this fourth modification, the right front crawler frame front portion 27a restrains the movement of the right end portion of the front lower weight 61 mounted on the right front pedestal 30 in the front-rear direction and the left-right direction (right front restraint portion 33). (See FIG. 17). The right front restraint portion 33 is an example of the crawler frame restraint portion in the present invention. The right front restraint portion 33 has a right front protrusion coupling portion 82 provided on the right front mounting portion 81 of the right front gantry 30. The right front projection coupling portion 82 is an example of the projection coupling portion in the present invention.

The right front protrusion coupling portion 82 restrains the movement of the front weight right end protrusion 64 in the front-rear direction and the left-right direction in a state where the right end portion of the front lower weight body 63 is mounted on the right front mounting portion 81 of the right front mount 30. As such, it is coupled to the right end protrusion 64 of the front weight. The right front projection connecting portion 82 is integrally formed with the right front mounting portion 81. That is, the right front projection coupling portion 82 is integrated with the right front mounting portion 81 to form a flat plate. The right front insertion hole 82a (FIG. 17) in which the right end protrusion 64 of the front weight can be inserted from above at the same time as the right end portion of the front lower weight body 63 is placed on the right front mounting portion 81 in the right front protrusion coupling portion 82. See). The right front insertion hole 82a is an example of the insertion hole in the present invention. The right front insertion hole 82a is a circular hole when viewed from above. The right front protrusion coupling portion 82 is coupled to the front weight right end protrusion 64 so as to restrain the movement of the front weight right end protrusion 64 inserted in the right front insertion hole 82a in the front-rear direction and the left-right direction.

Further, in this fourth modification, the left front pedestal 43 of the left crawler frame front portion 19a supports the left end portion of the front side lower weight 61 from below in a state where the left end portion of the front side lower weight 61 is placed. The left front pedestal 43 is an example of the crawler frame pedestal in the present invention. On the left front gantry 43, the left end portion of the front side lower weight body 63 among the left end portions of the front side lower weight 61 is placed. The left front pedestal 43 is symmetrically configured with the right front pedestal 30. Specifically, the left front mount 43 has a pair of legs 31 of the right front mount 30 and a pair of legs 83 and a left front mounting portion 84 that are symmetrically configured with the right front mounting portion 81. The left end portion of the front lower weight body 63 is mounted on the left front mounting portion 84.

The left crawler frame front portion 19a has a left front restraint portion 44 (see FIG. 13) that restrains the movement of the left end portion of the front lower weight 61 mounted on the left front pedestal 43 in the front-rear direction and the left-right direction. The left front restraint portion 44 is an example of the crawler frame restraint portion in the present invention. The left front restraint portion 44 has a left front protrusion coupling portion 85 provided in the left front mounting portion 84 and configured in the same manner as the right front protrusion coupling portion 82. The left front projection coupling portion 85 is an example of the projection coupling portion in the present invention. The left front projection coupling portion 85 is provided with a left front insertion hole 85a configured in the same manner as the right front insertion hole 82a. The left front insertion hole 85a is an example of the insertion hole in the present invention. The left front protrusion coupling portion 85 is provided in the front-rear direction and left and right of the front weight left end protrusion 65 inserted into the left front insertion hole 85a with the left end portion of the front lower weight body 63 mounted on the left front mounting portion 84. It is coupled to the left end protrusion 65 of the front weight so as to restrain the movement in the direction.

Further, the rear lower weight 71 is a rear lower weight body 73 configured symmetrically with the front lower weight main body 63, the front weight right end protrusion 64 and the front weight left end protrusion 65, the posterior weight right end protrusion 74, and the rear lower weight 71. It has a protrusion 75 at the left end of the rear weight (see FIG. 13).

The right rear pedestal 45 of the right crawler frame rear portion 27b supports the right end portion of the rear lower weight 71 from below with the right end portion of the rear lower weight 71 mounted. The right rear pedestal 45 is an example of the crawler frame pedestal in the present invention. On the right rear frame 45, the right end of the rear lower weight body 73 of the right end of the rear lower weight 71 is placed. The right rear pedestal 45 is configured symmetrically with the right front pedestal 30. Specifically, the right rear pedestal 45 has a pair of legs 31 of the right front pedestal 30 and a pair of legs 86 and a right rear mounting portion 87 configured symmetrically with the right front mounting portion 81. The right rear mounting portion 87 is a portion on which the right end portion of the rear lower weight main body 73 is mounted.

The right rear crawler frame rear portion 27b has a right rear restraining portion 46 that restrains the movement of the right end portion of the rear lower weight 71 mounted on the right rear frame 45 in the front-rear direction and the left-right direction. The right rear restraint portion 46 is an example of the crawler frame restraint portion in the present invention. The right posterior restraint portion 46 has a right posterior projection coupling portion 88 provided in the right posterior mounting portion 87 and configured in the same manner as the right anterior projection coupling portion 82. The right posterior projection coupling portion 88 is an example of the projection coupling portion in the present invention.

The right rear protrusion coupling portion 88 is provided with a right rear insertion hole 88a configured in the same manner as the right front insertion hole 82a. The right rear insertion hole 88a is an example of the insertion hole in the present invention. The right rear protrusion coupling portion 88 is a rear weight right end protrusion 74 inserted into the right rear insertion hole 88a with the right end portion of the rear lower weight body 73 mounted on the right rear mounting portion 87. It is coupled to the rear side weight right end protrusion 74 so as to restrain the movement in the front-rear direction and the left-right direction.

Further, the left rear pedestal 47 of the left crawler frame rear portion 19b supports the left end portion of the rear lower weight 71 from below with the left end portion of the rear lower weight 71 mounted. The left rear pedestal 47 is an example of the crawler frame pedestal in the present invention. On the left rear pedestal 47, the left end of the rear lower weight body 73 of the left end of the rear lower weight 71 is placed. The left rear pedestal 47 is configured symmetrically with the left front pedestal 43. Specifically, the left rear pedestal 47 has a pair of legs 83 and a pair of left front mounting portions 84 of the left front pedestal 43, and a pair of leg portions 89 and a left rear mounting portion 90 configured symmetrically with each other. The left rear mounting portion 90 is a portion on which the left end portion of the rear lower weight main body 73 is mounted.

The left rear crawler frame rear portion 19b has a left rear restraining portion 48 that restrains the movement of the left end portion of the rear lower weight 71 mounted on the left rear frame 47 in the front-rear direction and the left-right direction. The left rear restraint portion 48 is an example of the crawler frame restraint portion in the present invention. The left posterior restraint portion 48 has a left posterior projection coupling portion 91 provided in the left posterior mounting portion 90 and configured in the same manner as the right anterior projection coupling portion 82. The left posterior projection coupling portion 91 is an example of the projection coupling portion in the present invention.

The left rear protrusion coupling portion 91 is provided with a left rear insertion hole 91a configured in the same manner as the right front insertion hole 82a. The left rear insertion hole 91a is an example of the insertion hole in the present invention. The left rear protrusion coupling portion 91 is a rear weight left end protrusion 75 inserted into the left rear insertion hole 91a with the left end portion of the rear lower weight body 73 mounted on the left rear mounting portion 90. It is coupled to the rear side weight left end protrusion 75 so as to restrain the movement in the front-rear direction and the left-right direction.

Further, in this fourth modification, the same configuration as that for restraining the movement of the right end portion of the front side weight 13 in the above embodiment is applied to the configuration for restraining the movement of the right end portion of the front side upper weight 62. In addition, the same configuration as that for restraining the movement of the left end portion of the front weight 13 in the above embodiment is applied to the configuration for restraining the movement of the left end portion of the front side upper weight 62.

Specifically, the front side upper weight 62 is loaded on the front side lower weight 61 so as to cover the front side lower weight 61 from the right end portion to the left end portion of the front side lower weight 61. The front upper weight 62 is fixed to the front lower weight 61 in a state of being separable upward from the front lower weight 61. The right end portion of the front side upper weight 62 has a front side upper weight right recess 92 (see FIG. 15) which is a concave portion which opens downward on the lower surface thereof and also opens downward on the right side surface thereof. The front upper weight right recess 92 is configured in the same manner as the recess 50 at the right end of the front weight 13 in the embodiment.

Specifically, the front side upper weight 62 includes a front side upper weight body 62a that occupies most of the front side upper weight 62, and a right end plate 62b that covers the right side surface of the front side upper weight body 62a and is fixed to the right side surface thereof. Have. The right end of the front upper weight body 62a is provided with a recess 92a similar to the recess 50a provided at the right end of the front weight 13 in the embodiment. The right end plate 62b is provided with a notch portion 92b similar to the notch portion 50b provided in the right end plate 13b of the front weight 13 in the embodiment. The notch 92b and the recess 92a form a front upper weight right recess 92.

The left end of the front upper weight 62 is symmetrical with the right end of the front upper weight 62. Specifically, the left end portion of the front side upper weight 62 has a front side upper weight left concave portion, which is a concave portion that opens downward on the lower surface thereof and opens downward on the left side surface thereof. The front upper weight left recess is symmetrically configured with the front upper weight right recess 92.

The right end portion of the front side lower weight 61 has a front side weight right restraint portion 94 that restrains the movement of the right end portion of the front side upper weight 62 placed on the front side lower weight 61 in the front-rear direction and to the right. The front weight right restraint portion 94 is installed on the upper surface of the right end portion of the front lower weight main body 63 so as to project upward from the upper surface of the right end portion of the front lower weight main body 63, and the right end of the front lower weight main body 63. It is a convex portion that fits into the front side upper weight right concave portion 92 of the right end portion of the front side upper weight 62 mounted on the portion. The front weight right restraint portion 94 has the same configuration as the right front restraint portion 33 in the embodiment. That is, the front weight right restraint portion 94 is configured in the same manner as the front / rear movement restraint portion 37 and the right movement restraint portion 38 of the right front restraint portion 33 in the above embodiment, and the front weight right end portion front / rear movement restraint portion 95 and the front weight right. It has a one-way movement restraint portion 96.

The front weight right restraint portion 94 has an upper side surface 94a of the front weight right restraint portion, which is a surface facing upward. The front side weight right restraint upper side surface 94a is an example of the weight restraint upper side surface in the present invention. The front side weight right end portion upper side surface 94a is of the front side weight right end portion front / rear movement restraint portion upper side surface 95a and the front side weight right end portion right end movement restraint portion 96, which is a surface facing upward of the front side weight right end portion front / rear movement restraint portion 95. Includes the front side weight rightward movement restraint upper side surface 96a, which is a surface facing upward.

The front-rear movement restraint portion 95 at the right end of the front weight has a chevron-shaped plate shape similar to the front-rear movement restraint portion 37 in the embodiment, and is similar to the fitting of the front-rear movement restraint portion 37 to the notch portion 50b in the embodiment. It is fitted in the notch 92b constituting the front upper weight right recess 92. In a state where the front weight right restraint portion 94 is fitted in the front upper weight right recess 92, that is, in a state where the front weight right end front / rear movement restraint portion 95 is fitted in the notch portion 92b, the front weight right end portion front / rear movement restraint portion 95. The front end abuts on the lower end front portion of the inner surface of the front side upper weight right recess 92, and the rear end of the front-rear movement restraint portion 95 of the front side upper weight right end portion abuts on the lower end rear portion of the inner surface of the front side upper weight right recess 92. The front / rear movement restraining portion 95 at the right end of the front weight restrains the movement of the right end of the front upper weight 62 in the front-rear direction.

The upper side surface 95a of the front-rear movement restraint portion at the right end of the front weight is the front side inclined portion 95c that inclines downward from the central portion 95b in the front-rear direction of the upper side surface 95a, and the front side inclined portion 95c toward the rear from the central portion 95b. It has a rear inclined portion 95d, which inclines downward as it increases. The front inclined portion 95c is an example of the weight restraint front inclined portion in the present invention, and the rear inclined portion 95d is an example of the weight restrained rear inclined portion in the present invention.

Further, in a state where the front weight right restraint portion 94 is fitted to the front upper weight right recess 92, the left end portion of the front weight right movement restraint portion 96 is located at the lower end of the front upper weight right recess 92, and the front upper weight right is right. The concave portion 92 abuts on the right inner side surface from the right side, whereby the front side weight right movement restraining portion 96 restrains the movement of the front side upper weight 62 to the right end portion. The front side weight right end movement restraint portion upper side surface 96a is located inside (left side) in the left-right direction with respect to the front side inclined portion 95c and the rear side inclined portion 95d of the upper side surface 95a of the front side weight right end portion front-back movement restraint portion 95. There is. The front side weight rightward movement restraint upper side surface 96a has an inner inclined portion 96b that inclines downward toward the inside (leftward) in the left-right direction. The inner inclined portion 96b is an example of the inner inclined portion of the weight restraint portion in the present invention.

Further, the left end portion of the front side lower weight 61 has a front side weight left restraint portion 97 that restrains the movement of the left end portion of the front side upper weight 62 placed on the front side upper weight 62 in the front-rear direction and to the left. The front weight left restraint portion 97 is installed on the upper surface of the left end portion of the front lower weight main body 63 so as to project upward from the upper surface of the left end portion of the front lower weight main body 63, and the left end of the front lower weight main body 63. It is a convex portion that fits into the left concave portion (not shown) of the front upper weight of the left end portion of the front upper weight 62 placed on the portion. The front weight left restraint portion 97 is configured symmetrically with the front weight right restraint portion 94. Specifically, the front weight left restraint portion 97 is symmetrical with the front weight right end front / rear movement restraint portion 95 and the front weight right right movement restraint portion 96, and the front weight left end portion front / rear movement restraint portion 98 and the front weight. It has a left movement restraint portion 99. The front / rear movement restraining portion 98 at the left end of the front weight is a portion that restrains the movement of the left end of the front upper weight 62 in the front-rear direction. The front weight left movement restraint portion 99 is a portion that restrains the left end portion of the front side upper weight 62 to move to the left.

The front weight left restraint portion 97 has an upper side surface 97a of the front weight left restraint portion, which is a surface facing upward. The front side weight restraint portion upper side surface 97a is an example of the weight restraint portion upper side surface in the present invention. The front side weight left end restraint portion upper side surface 97a is of the front side weight left end portion front-rear movement restraint portion upper side surface 98a and the front side weight left end portion front-rear movement restraint portion 99, which is a surface facing upward among the front side weight left end portion front-rear movement restraint portion 98. Includes the front side weight, the upper side surface 99a of the left movement restraint portion, which is a surface facing upward. The upper side surface 98a of the front-rear movement restraint portion at the left end of the front weight is configured in the same manner as the upper side surface 95a of the front-rear movement restraint portion at the right end of the front weight. Further, the front side weight left movement restraint upper side surface 99a is configured symmetrically with the front side weight right right movement restraint upper side surface 96a. That is, the front side weight left movement restraint upper side surface 99a has an inner inclined portion 99b configured symmetrically with the inner inclined portion 96b of the front side weight right right movement restraint upper side surface 96a. The inner inclined portion 99b is an example of the inner inclined portion of the weight restraint portion in the present invention.

With the left end of the front upper weight 62 mounted on the left end of the front lower weight body 63, the front weight left restraint portion 97 fits into the front upper weight left recess of the left end of the front upper weight 62. By doing so, the movement of the left end portion of the front side upper weight 62 with respect to the left end portion of the front side lower weight 61 is restricted in the front-rear direction and to the left. The fitting structure of the front side upper weight left concave portion and the front side weight left restraining portion 97 is symmetrical with the fitting structure of the front side upper weight right concave portion 92 and the front side weight right restraining portion 94.

Further, the rear upper weight 72 is loaded on the rear lower weight 71 so as to cover the rear lower weight 71 from the right end portion to the left end portion of the rear lower weight 71. The rear upper weight 72 is fixed to the rear lower weight 71 in a state of being separable upward from the rear lower weight 71. The right end of the rear upper weight 72 has a rear upper weight right recess, which is a recess that opens downward on the lower surface thereof and also opens to the right on the right surface thereof. The rear upper weight right recess is configured in the same manner as the front upper weight right recess 92. Further, the left end portion of the rear upper weight 72 has a rear upper weight left recess, which is a recess that opens downward on the lower surface thereof and opens downward on the left surface thereof. The rear upper weight left recess is symmetrically configured with the rear upper weight right recess.

The right end portion of the rear lower weight 71 has a rear weight right restraint portion 101 that restrains the movement of the right end portion of the rear upper weight 72 placed on the rear lower weight 71 in the front-rear direction and to the right. The rear side lower weight right restraining portion 101 is installed on the upper surface of the right end portion of the rear lower weight main body 73 so as to project upward from the upper surface of the right end portion of the rear lower weight main body 73, and the rear lower weight main body It is a convex portion that fits into the right concave portion of the rear upper weight of the right end portion of the rear upper weight 72 placed on the right end portion of 73. The rear weight right restraint portion 101 is configured in the same manner as the front weight right restraint portion 94. That is, the rear side weight right restraint portion 101 is similarly the same as the rear side weight right end portion front / rear movement restraint portion 102 and the front side weight right end movement restraint portion 96, which are configured in the same manner as the front side weight right end portion front / rear movement restraint portion 95. It has a configured rear weight rightward movement restraint portion 103. With the right end of the rear upper weight 72 mounted on the right end of the rear lower weight body 73, the rear weight right restraint portion 101 is the rear upper weight of the right end of the rear upper weight 72. By fitting into the right concave portion, the movement of the right end portion of the rear upper weight 72 with respect to the right end portion of the rear lower weight 71 is restricted in the front-rear direction and to the right. The fitting structure of the rear upper weight right concave portion and the rear weight right restraining portion 101 is the same as the fitting structure of the front upper weight right concave portion 92 and the front weight right restraining portion 94.

The left end portion of the rear lower weight 71 has a rear weight left restraint portion 104 that restrains the movement of the left end portion of the rear upper weight 72 placed on the rear lower weight 71 in the front-rear direction and to the left. The rear weight left restraint portion 104 is installed on the upper surface of the left end portion of the rear lower weight main body 73 so as to project upward from the upper surface of the left end portion of the rear lower weight main body 73, and the rear lower weight main body It is a convex portion that fits into the left concave portion of the rear upper weight of the left end portion of the rear upper weight 72 placed on the left end portion of 73. The rear weight left restraint portion 104 is configured in the same manner as the front weight left restraint portion 97, and is configured symmetrically with the rear weight right restraint portion 101. The rear weight left restraint portion 104 is configured in the same manner as the rear weight left end portion front / rear movement restraint portion 105 and the front side weight left end portion front / rear movement restraint portion 99, which are configured in the same manner as the front weight left end portion front / rear movement restraint portion 98. It has a rear weight left movement restraint portion 106. With the left end of the rear upper weight 72 mounted on the left end of the rear lower weight body 73, the rear weight left restraint portion 104 is the rear upper weight of the left end of the rear upper weight 72. By fitting into the left concave portion, the movement of the left end portion of the rear upper weight 72 with respect to the left end portion of the rear lower weight 71 is restricted in the front-rear direction and to the left. The fitting structure of the rear upper weight left recess and the rear weight left restraint portion 104 is symmetrical with the fitting structure of the rear upper weight right recess and the rear weight right restraint portion 101.

Further, the front lower weight 61 can mount the front lower weight 61 on the ground with the front lower weight body 63 floating from the ground when the front lower weight 61 is placed on the ground, and the front lower weight 61 can be placed on the ground. When the front lower weight 61 is loaded on the transport vehicle in order to transport the weight 61 by the transport vehicle, the front lower weight 61 is placed on the loading surface in a state where the front lower weight body 63 is floated from the loading surface of the transport vehicle. It is configured so that it can be placed.

Specifically, the front lower weight 61 has a front lower weight right support leg 66 and a front lower weight left support leg 67 projecting downward from the lower surface of the front lower weight main body 63. The amount of protrusion of the front lower weight right support leg 66 and the front lower weight left support leg 67 from the lower surface of the front lower weight body 63 is the lower surface of the front lower weight body 63 of the front weight right end protrusion 64 and the front weight left end protrusion 65. Equal to the amount of protrusion from. The front lower weight right support leg 66 and the front lower weight left support leg 67 float the front lower weight body 63 with respect to the ground or the loading surface of the transport vehicle together with the front weight right end protrusion 64 and the front weight left end protrusion 65. Support in a state. In other words, the front side weight right end protrusion 64 and the front side weight left end protrusion 65 also have a function as support legs for supporting the front side lower weight body 63 in a floating state with respect to the ground or the loading surface. The front lower weight right support leg 66 is located to the right of the center of the front lower weight body 63 in the left-right direction, to the left of the front right end protrusion 64, and to the rear of the front weight right end protrusion 64. is doing. The front lower weight left support leg 67 is located to the left of the center of the front lower weight body 63 in the left-right direction, to the right of the front left end protrusion 65, and to the rear of the front weight left end protrusion 65. is doing. The front lower weight right support leg 66 and the front lower weight left support leg 67 are arranged symmetrically with respect to the center of the front lower weight main body 63 in the left-right direction.

Further, as for the rear lower weight 71, similarly to the front lower weight 61, when the rear lower weight 71 is placed on the ground, the rear lower weight main body 73 is floated on the ground from the ground. The rear lower weight 71 can be mounted, and when the rear lower weight 71 is loaded on the transport vehicle in order to transport the rear lower weight 71 by the transport vehicle, the rear lower weight body 73 is mounted from the loading surface of the transport vehicle. The rear lower weight 71 can be placed on the loading surface in a floating state. Specifically, the rear lower weight 71 is configured to be symmetrical with the front lower weight 61, and the rear lower weight right support leg 76 and the rear lower weight projecting downward from the lower surface of the rear lower weight body 73. It has a weight left support leg 77. The rear lower weight right support leg 76 and the rear lower weight left support leg 77 are configured in the same manner as the front lower weight right support leg 66 and the front lower weight left support leg 67. The rear lower weight right support leg 76 and the rear lower weight left support leg 77, together with the rear weight right end protrusion 74 and the rear weight left end protrusion 75, have a rear lower weight with respect to the ground or the loading surface of the transport vehicle. Support the main body 73 in a floating state. In other words, the rear side weight right end protrusion 74 and the rear side weight left end protrusion 75 also have a function as support legs for supporting the rear lower weight main body 73 in a floating state with respect to the ground or the loading surface.

In this fourth modification, the right end portion of the front lower weight body 63 is placed on the right front mounting portion 81 of the right front pedestal 30, and at the same time, the front side right end protrusion 64 is placed in the right front insertion hole 82a of the right front protrusion coupling portion 82. It can be inserted to restrain the movement of the front right end protrusion 64 in the front-rear direction and the left-right direction, and at the same time, the left end portion of the front lower weight body 63 is placed on the left front mounting portion 84 of the left front gantry 43, and at the same time, the left front. The left end protrusion 65 of the front weight can be inserted into the left front insertion hole 85a of the protrusion coupling portion 85 to restrain the movement of the left end protrusion 65 of the front weight in the front-rear direction and the left-right direction. Then, the movement of the right end protrusion 64 of the front weight is constrained by the movement of the right end of the front lower weight 61 in the front-rear direction and the left-right direction, and the movement of the left end protrusion 65 of the front weight is restrained by the front lower weight 61. The movement of the left end of the is restricted in the front-back direction and the left-right direction. Therefore, in this fourth modification, the work related to the restraint of the right end portion and the left end portion of the front lower weight 61 can be simplified.

Further, in this fourth modification, the right end portion of the rear lower weight body 73 is placed on the right rear mounting portion 87 of the right rear pedestal 45, and at the same time, it is placed in the right rear insertion hole 88a of the right rear protrusion connecting portion 88. The right end protrusion 74 of the rear weight can be inserted to restrain the movement of the right end protrusion 74 of the rear weight in the front-rear direction and the left-right direction, and the left end portion of the rear lower weight body 73 is left rear of the left rear frame 47. At the same time as mounting on the mounting portion 90, the rear weight left end protrusion 75 is inserted into the left rear insertion hole 91a of the left rear protrusion joint 91, and the rear weight left end protrusion 75 is inserted in the front-rear direction and the left-right direction. Can restrain the movement of. Then, the movement of the right end protrusion 74 of the rear weight is restrained by restraining the movement of the right end portion of the rear lower weight 71 in the front-rear direction and the left-right direction, and the movement of the left end protrusion 75 of the rear weight is restrained by the restraint of the movement. The movement of the left end portion of the lower lateral weight 71 in the front-rear direction and the left-right direction is restricted. Therefore, in this fourth modification, the work related to the restraint of the right end portion and the left end portion of the rear lower weight 71 can be simplified.

Further, in this fourth modification, the front weight right end protrusion 64 has a tapered portion 64a whose diameter becomes smaller toward its tip, and the front weight left end protrusion 65 has a tapered portion 65a whose diameter becomes smaller toward its tip. Have. Further, the rear side weight right end protrusion 74 and the rear side weight left end protrusion 75 each have a similar tapered portion. Therefore, when the right end portion of the front lower weight body 63 is placed on the right front mounting portion 81 of the right front mount 30, the front weight right end protrusion 64 is in the front-rear direction and / or the left-right direction with respect to the right front insertion hole 82a. The right end protrusion 64 of the front weight can be inserted into the right front insertion hole 82a even if the position is slightly displaced. Further, when the left end portion of the front lower weight body 63 is placed on the left front mounting portion 84 of the left front pedestal 43, the front side weight left end protrusion 65 is oriented in the front-rear direction and / or the left-right direction with respect to the left front insertion hole 85a. The left end protrusion 65 of the front weight can be inserted into the left front insertion hole 85a even if the position is slightly displaced. Further, when the right end portion of the rear lower weight main body 73 is placed on the right rear mounting portion 87 of the right rear pedestal 45, the rear side weight right end protrusion 74 is located in the front-rear direction with respect to the right rear insertion hole 88a. / Or even if the position is slightly displaced in the left-right direction, the rear weight right end protrusion 74 can be inserted into the right rear insertion hole 88a. Further, when the left end portion of the rear lower weight body 73 is placed on the left rear mounting portion 90 of the left rear pedestal 47, the rear side weight left end portion protrusion 75 is located in the front-rear direction with respect to the left rear insertion hole 91a. / Or even if the position is slightly displaced in the left-right direction, the rear weight left end protrusion 75 can be inserted into the left rear insertion hole 91a.

Further, in this fourth modification, it is possible to select whether or not to further load the front side upper weight 62 on the front side lower weight 61 loaded on the left front pedestal 43 and the right front pedestal 30, so that the front side lower weight 61 is used. The weight of the weight to be loaded on the left front pedestal 43 and the right front pedestal 30 can be adjusted depending on whether or not the front weight 62 is loaded on the front side. Similarly, since it is possible to select whether or not to further load the rear upper weight 72 on the rear lower weight 71 loaded on the left rear pedestal 47 and the right rear pedestal 45, it is possible to select whether or not to load the rear upper weight 72 on the rear lower weight 71. The weight of the weight to be loaded on the left rear pedestal 47 and the right rear pedestal 45 can be adjusted depending on whether or not the rear upper weight 72 is loaded on the rear side.

Further, in this fourth modification, when the crane 1 is disassembled and transported, the front lower weight 61 and the front upper weight 62 can be separated and transported separately, and the rear lower weight 71 and the rear side can be transported separately. The upper weight 72 can be separated and transported separately. The weights of the front lower weight 61 and the front upper weight 62 are smaller than the total weight of the front lower weight 61 and the front upper weight 62 in a stacked state, and the rear lower weight 71 and the rear upper weight 62 are stacked. The weight of each of the 72 is smaller than the total weight of the rear lower weight 71 and the rear upper weight 72 stacked on each other. Therefore, in the fourth modification, the front lower weight 61, the front upper weight 62, the rear lower weight 71, and the rear upper weight 72 are transported even if the transport vehicle has a relatively low loading capacity. Can be done.

Further, in this fourth modification, the front lower weight 61 and the front upper weight 62 can be individually lifted and stacked on the left front pedestal 43 and the right front pedestal 30, and the rear weight 71 and the rear upper weight 72 can be stacked. And can be individually lifted and stacked on the left rear pedestal 47 and the right rear pedestal 45. As described above, the weight of each of the front lower weight 61 and the front upper weight 62 is smaller than the total weight of the front lower weight 61 and the front upper weight 62, and the posterior lower weight 71 and the rear upper weight 72 Since the respective weights are smaller than the total weight of the rear lower weight 71 and the rear upper weight 72, in the fourth modification, the front lower weight 61 and the front upper weight 62 are used as the left front pedestal 43 and the right front pedestal 30. Individual suspension work of the front lower weight 61 and the front upper weight 62 for stacking on top, and for stacking the rear lower weight 71 and the rear upper weight 72 on the left rear pedestal 47 and the right rear pedestal 45. The individual lower weight 71 on the rear side and the upper weight 72 on the rear side can be easily suspended, and even an auxiliary crane having a relatively low suspension capacity can be suspended.

Further, in this fourth modification, when the front upper weight 62 is loaded on the front lower weight 61, the weight of the front upper weight 62 is used to omit the vertical restraint of the front upper weight 62. With respect to the front lower weight 61 only by the combination of the placement of the front upper weight 62 on the front lower weight 61 and the horizontal restraint of the front upper weight 62 by the front weight right restraint portion 94 and the front weight left restraint portion 97. The front upper weight 62 can be fixed. Therefore, the front side upper weight 62 can be fixed to the front side lower weight 61 with a simple operation. Similarly, when the rear upper weight 72 is loaded on the rear lower weight 71, the weight of the rear upper weight 72 is used to omit the vertical restraint of the rear upper weight 72, and the rear Only by combining the placement of the rear upper weight 72 on the lower side weight 71 and the restraint of the rear upper weight 72 in the horizontal direction by the rear side weight right restraint portion 101 and the rear side weight left restraint portion 104, the rear side lower side The rear upper weight 72 can be fixed to the weight 71. Therefore, the rear upper weight 72 can be fixed to the rear lower weight 71 with a simple operation.

Further, in this fourth modification, the right end portion of the front side upper weight 62 has a front side upper weight right concave portion 92 that opens downward, and the front side weight right restraint portion 94 is in the front-rear direction and the front-rear direction of the right end portion of the front side upper weight 62. It is a convex portion that fits into the front upper weight right concave portion 92 from the lower side so as to restrain the movement to the right. Further, the left end portion of the front side upper weight 62 has a front side upper weight left recess which is open downward, and the front side weight left restraint portion 97 is provided in the front-rear direction and to the left of the left end portion of the front side upper weight 62. It is a convex portion that fits into the left concave portion of the upper weight on the front side from the lower side so as to restrain the movement. Therefore, the right end portion of the front side upper weight 62 is placed on the right end portion of the front side lower weight 61, and at the same time, the front side upper weight right restraint portion 94 is fitted into the front side upper weight right recess 92 to fit the front side weight right restraint portion 94 to the right end of the front side upper weight 62. It is possible to restrain the movement of the portion in the front-rear direction and to the right, and at the same time, the left end portion of the front upper weight 62 is placed on the left end portion of the front lower weight 61, and at the same time, the lower front weight left restraint portion is placed in the front upper weight left recess. The 97 can be fitted to restrain the movement of the left end portion of the front upper weight 62 in the front-rear direction and to the left. Therefore, it is possible to simplify the work of restraining the right end portion and the left end portion of the front upper weight 62.

Further, the right end portion of the rear side upper weight 72 has a rear side upper weight right concave portion which is open downward, and the rear side upper weight right restraint portion 101 is in the front-rear direction of the right end portion of the rear side upper weight 72. And a convex portion that fits into the rear upper weight right concave portion from the lower side so as to restrain the movement to the right. Further, the left end portion of the rear side upper weight 72 has a rear side upper weight left recess which is open downward, and the rear side upper weight left restraint portion 104 is in the front-rear direction of the left end portion of the rear side upper weight 72. And a convex portion that fits into the rear upper weight left concave portion from the lower side so as to restrain the movement to the left. Therefore, as in the case of the front side upper weight 62, the work related to the restraint of the right end portion and the left end portion of the rear side upper weight 72 can be simplified.

Further, in this fourth modification, the front side inclined portion 95a of the upper side surface 95a of the front side weight right end portion front-rear movement restraint portion 95 of the front side weight right restraint portion 94 is inclined downward from the central portion 95b toward the front. It has a 95c and a rear inclined portion 95d that inclines downward from the central portion 95b toward the rear. Therefore, when the right end portion of the front side upper weight 62 is placed on the right end portion of the front side lower weight 61, the front side upper weight right recess 92 is displaced in the front-rear direction with respect to the front side weight right restraint portion 94. Even when the front edge or the trailing edge of the front side upper weight right recess 92 abuts on the upper side surface 95a of the front side weight right end portion front-rear movement restraint portion 95, the front side inclined portion 95c and the rear side inclined portion of the upper side surface 95a. The inclination of 95d can guide the right end portion of the front side upper weight 62 to a position where the front side upper weight right recess 92 fits with the front side weight right restraint portion 94. Therefore, the front side upper weight right concave portion 92 and the front side weight right restraint portion 94 can be fitted without any trouble.

Specifically, when the right end portion of the front side upper weight 62 is placed on the right end portion of the front side lower weight 61, the front side upper weight right recess 92 is displaced forward with respect to the front side weight right restraint portion 94. When the trailing edge of the front side upper weight right recess 92 abuts on the rear inclined portion 95d of the upper side surface 95a of the front side weight right end portion front-rear movement restraint portion 95, the front side upper along the inclination of the rear side inclined portion 95d. The right end portion of the weight 62 can be displaced backward while moving downward, and the right end portion of the front upper weight 62 can be guided to a position where the front upper weight right recess 92 fits with the front weight right restraint portion 94. Further, when the right end portion of the front side upper weight 62 is placed on the right end portion of the front side lower weight 61, the front side upper weight right recess 92 is displaced rearward with respect to the front side weight right restraint portion 94, and the front side upper portion is displaced. When the leading edge of the weight right recess 92 abuts on the front inclined portion 95c of the upper side surface 95a of the front-rear movement restraint portion 95 on the right end of the front weight, the right end of the front upper weight 62 is along the inclination of the front inclined portion 95c. The right end portion of the front side upper weight 62 can be guided to a position where the front side upper weight right concave portion 92 fits with the front side weight right restraint portion 94 by displacing the portion forward while moving downward.

Further, in this fourth modification, the upper side surface of the front side weight left end portion front-rear movement restraint portion 98 of the front side weight left restraint portion 97, and the upper side surface of the rear side weight right end portion front-rear movement restraint portion 102 of the rear side weight right restraint portion 101. The upper side surface of the rear side weight left end portion front-rear movement restraint portion 105 of the rear side weight left restraint portion 104 is configured in the same manner as the upper side surface 95a of the front side weight right end portion front-rear movement restraint portion 95 of the front side weight right restraint portion 94. Has been done. Therefore, as in the case of fitting the front upper weight right recess 92 and the front weight right restraint portion 94, the position in the front-rear direction when the front upper weight left recess and the front weight left restraint portion 97 are fitted. Misalignment, positional deviation in the front-rear direction when the rear upper weight right recess and the rear weight right restraint portion 101 are fitted, and fitting of the rear upper weight left recess and the rear weight left restraint portion 104. It is possible to eliminate the positional deviations in the front-rear direction and to fit them without any trouble.

Further, in this fourth modification, the upper side surface 96a of the front weight right movement restraint portion 96 of the front weight right restraint portion 94 has an inner inclined portion 96b that inclines downward as it goes to the left. Therefore, when the right end portion of the front side upper weight 62 is placed on the right end portion of the front side lower weight 61 and the front side upper weight right concave portion 92 and the front side weight right restraint portion 94 are fitted, the front side upper weight right concave portion 92 Is displaced to the right with respect to the front weight right restraint portion 94, and when the left edge of the front side upper weight right recess 92 abuts on the inner inclined portion 96b, the inner inclined portion 96b is inclined to the front side upper side. The right end portion of the weight 62 can be guided to a position where the front upper weight right recess 92 fits with the front weight right restraint portion 94. Therefore, the front side upper weight right concave portion 92 and the front side weight right restraint portion 94 can be fitted without any trouble.

Specifically, the front upper weight right recess 92 is displaced to the right with respect to the front weight right restraint portion 94, and the right end portion of the front upper weight 62 is placed on the right end portion of the front lower weight 61. When the left edge of the front upper weight right recess 92 sometimes abuts on the inner inclined portion 96b of the upper side surface 96a of the front weight right movement restraint portion 96, the front upper weight is along the inclination of the inner inclined portion 96b. The right end portion of the front side upper weight 62 can be guided to a position where the front side upper weight right concave portion 92 fits with the front side weight right restraint portion 94 by displacing the right end portion of the front side upper weight 62 to the left while moving the right end portion downward.

Further, the upper side surface 99a of the front weight left movement restraint portion 99 is symmetrical with the upper side surface 96a of the front weight right movement restraint portion 96. Therefore, when the left end portion of the front side upper weight 62 is placed on the left end portion of the front side lower weight 61 and the front side upper weight left concave portion and the front side weight left restraint portion 97 are fitted, the front side upper weight left concave portion is on the front side. When the position is shifted to the left with respect to the weight left restraint portion 97 and the right edge of the front side upper weight left concave portion abuts on the inner inclined portion 99b of the upper side surface 99a of the front side weight left movement restraint portion 99. The inclination of the inner inclined portion 99b can guide the left end portion of the front upper weight 62 to a position where the front upper weight left concave portion fits with the front weight left restraining portion 97. Therefore, the front side upper weight left concave portion and the front side weight left restraint portion 97 can be fitted without any trouble.

Further, the upper side surface of the rear side weight right restraint portion 101 and the rear side weight right movement restraint portion 103 is configured in the same manner as the upper side surface 96a of the front side weight right restraint portion 96 of the front side weight right restraint portion 94. .. Therefore, when the right end portion of the rear upper weight 72 is placed on the right end portion of the rear lower weight 71 and the rear upper weight right concave portion and the rear weight right restraint portion 101 are fitted, the rear upper weight portion 101 is fitted. When the weight right recess is displaced to the right with respect to the rear weight right restraint portion 101, the misalignment is when the front upper weight right recess 92 and the front weight right restraint portion 94 are fitted together. Similarly, the fitting of the rear upper weight right concave portion and the rear weight right restraint portion 101 can be performed without any trouble.

Further, the upper side surface of the rear side weight left restraint portion 104 of the rear side weight left restraint portion 104 is configured in the same manner as the upper side surface 99a of the front side weight left movement restraint portion 99 of the front side weight left restraint portion 97. .. Therefore, when the left end portion of the rear upper weight 72 is placed on the left end portion of the rear lower weight 71 and the rear upper weight left concave portion and the rear weight left restraint portion 104 are fitted, the rear upper weight portion 104 is fitted. When the weight left concave portion is displaced to the left with respect to the rear weight left restraining portion 104, the positional deviation is the case where the front upper weight left concave portion and the front weight left restraining portion 97 are fitted together. Similarly, the problem can be solved so that the rear upper weight left concave portion and the rear weight left restraint portion 104 can be fitted without any trouble.

(13) Further, the lower traveling body in the present invention may have two or more stages of front upper weights configured to be loadable on the front weights (front lower weights). Further, the lower traveling body in the present invention may have two or more stages of rear upper weights configured to be loadable on the rear weights (rear lower weights).

In this case, among the two or more front upper weights, the front upper weights other than the uppermost one have the same left and right restraint portions as the front weight left restraint portion and the front weight right restraint portion of the front weight (front side lower weight). The front upper weight of each stage has a front upper weight left recess and a front upper weight right recess, and the left restraint portion of the lower front upper weight is stacked on the lower front upper weight. Fit to the left concave portion of the front upper weight of the upper weight, and the right restraint portion of the upper front weight of the lower stage is fitted to the right concave portion of the front upper weight of the front upper weight of the upper stage stacked on the front upper weight of the lower stage. Therefore, it suffices that the movement of the upper front weight in the upper row with respect to the upper weight in the front in the lower row is restricted in the left-right direction and the front-rear direction. Similarly, among the two or more rear upper weights, the rear upper weights other than the uppermost one are the rear weight left restraint portion and the rear weight right restraint portion of the rear weight (rear side lower weight). The rear upper weight of each stage has the same left and right restraint portions as above, and the rear upper weight has a left concave portion of the rear upper weight and a right concave portion of the rear upper weight. The right restraint portion of the rear upper weight of the lower tier is stacked on the rear upper weight of the lower tier and is fitted to the left concave portion of the rear upper weight of the upper tier and is stacked on the rear upper weight of the lower tier. By fitting into the rear upper weight right recess of the upper rear upper weight, the movement of the upper rear upper weight with respect to the lower rear upper weight is restricted in the left-right direction and the front-rear direction. Just do it.

If the total weight of the weights loaded on the left front pedestal and the right front pedestal is the same, it is possible to reduce the weight of the front upper weight and the weight of the front lower weight of each stage as the number of stages of the front upper weight increases. Become. If the total weight of the weights loaded on the left rear pedestal and the right rear pedestal is the same, the weight of the rear upper weight and the weight of the rear lower weight of each stage increases as the number of stages of the rear upper weight increases. Can be made smaller. Therefore, according to this configuration, it is possible to finely adjust the weight of the weight loaded on the left front pedestal and the right front pedestal by changing the number of stages of the front side upper weight loaded on the front side weight (front side lower weight). At the same time, by changing the number of stages of the rear upper weight to be loaded on the rear weight (rear lower weight), the weight of the weight loaded on the left rear pedestal and the right rear pedestal can be adjusted more finely. It is possible. Further, according to this configuration, when transporting the front lower weight, the front upper weight of each stage, the rear lower weight, and the posterior upper weight of each stage individually, even if the transport vehicle has a lower transport capacity, they are transported. It becomes possible to transport the weight of. Further, according to this configuration, the front weights and the individual suspension work of the weights for loading the front weights and the front upper weights of each stage on the left front pedestal and the right front pedestal, and on the left rear pedestal and the right rear pedestal. It is easier to suspend the rear weights and the individual weights for loading the rear upper weights of each stage, and even if the auxiliary crane has a lower suspension capacity, the suspension work should be performed. Will be possible.

(14) The shape of the front side upper weight when the front side upper weight is viewed from above in the present invention may be different from the shape of the front side weight when the front side weight (front side lower weight) is viewed from above. Further, the shape of the rear upper weight when the rear upper weight is viewed from above in the present invention is different from the shape of the rear weight when the rear weight (rear lower weight) is viewed from above. You may. In this case, the position where the front weight left restraint portion is provided in the front weight (front lower weight) is not limited to the left end of the front weight, and is different depending on the shape of the front upper weight. It suffices as long as the front weight left restraint portion can be fitted to the front upper weight left recess according to the position of the recess. Further, the position where the front side weight right restraint portion is provided in the front side weight (front side lower weight) is not limited to the right end of the front side weight, and is different depending on the shape of the front side upper weight. It suffices as long as the front weight right restraining portion can be fitted into the front upper weight right concave portion according to the position of. Further, the position where the rear side weight left restraint portion is provided in the rear side weight (rear side lower weight) is not limited to the left end portion of the rear side weight, and is different depending on the shape of the rear side upper weight. It suffices as long as the rear weight left restraining portion can be fitted to the rear upper weight left recess in accordance with the position of the rear upper weight left recess of the portion. Further, the position where the rear side weight right restraint portion is provided in the rear side weight (rear side lower weight) is not limited to the right end of the rear side weight, and the right end portion of the rear side upper weight that differs depending on the shape of the rear side upper weight. It suffices as long as the rear weight right restraining portion is in a position where it can be fitted into the rear upper weight right recess in accordance with the position of the rear upper weight right recess.

For example, when the width of the front upper weight in the left-right direction is smaller than the width of the front weight (front lower weight) in the same direction, the position where the front weight left restraint portion is provided is the front upper portion of the left end portion of the front upper weight. The position may be any position from the left end of the front weight (front lower weight) to the right side according to the position of the weight left concave portion, and the position where the front weight right restraint portion is provided is the front upper weight right of the right end portion of the front upper weight. It may be a position that enters from the right end to the left side of the front weight (front lower weight) according to the position of the recess. When the width of the rear upper weight in the left-right direction is smaller than the width of the rear weight (rear lower weight) in the same direction, the position where the rear weight left restraint portion is provided is the rear upper weight. The position where the rear weight right restraint portion is provided is the position where the rear weight (rear side lower weight) is inserted from the left end to the right side according to the position of the rear upper weight and the left concave portion of the left end portion. It suffices if the position is from the right end of the rear weight (rear lower weight) to the left side in accordance with the position of the rear upper weight right concave portion of the right end of the upper weight.

(15) Further, the front upper weight and the rear upper weight of the lower traveling body in the present invention can be shared with the counter weight mounted on the rear portion of the upper turning body. The shape seen from above the counter weight is different from the shape seen from above each of the front weight (front lower weight) and the rear weight (rear lower weight), but each of the front upper weight and the rear upper weight. The shape seen from above may be made to match the shape seen from above of the counter weight, and the front upper weight and the rear upper weight may be shared with the counter weight. In this case, the shape seen from above the front upper weight is different from the shape seen from above the front weight (front lower weight), and the shape seen from above the rear upper weight is the posterior weight (rear lower weight). Since the shape is different from the shape seen from above, the front weight left restraint portion is arranged at a position where the front weight left restraint portion can be fitted into the front side upper weight left recess of the left end of the front side upper weight, and the front side weight right restraint portion is arranged. Is placed at a position where it can be fitted into the right end of the front side upper weight, and the left end of the rear side weight is fitted into the left end of the rear side upper weight. It may be arranged at a position where it can be fitted, and the rear side weight right restraint portion may be arranged at a position where it can be fitted into the rear side upper weight right concave portion at the right end of the rear side upper weight.

(16) Further, in the configurations of the above-described embodiment and the first to third modifications, the right crawler frame front portion 27a is on the right end portion of the front weight that simply restrains the upward movement of the right end portion of the front weight 13. The left crawler frame front portion 19a may further have a movement restraint portion, and the left crawler frame front portion 19a further has a movement restraint portion on the left end portion of the front weight that simply restrains the upward movement of the left end portion of the front weight 13. May be good. Further, the right crawler frame rear portion 27b may further have a rear weight right end upper movement restraining portion that simply restrains the upward movement of the right end portion of the rear weight 14, and the left crawler frame rear portion 19b may further have. The rear weight 14 may further have a movement restraint portion on the left end portion of the rear weight 14 that simply restrains the upward movement of the left end portion.

Even with such a configuration, the upward movement of the front weight 13 is suppressed by the large weight of the front weight 13, so that the restraint of the right end of the front weight 13 by the upper movement restraint on the right end of the front weight and the restraint of the right end of the front weight 13 , The restraint of the left end portion of the front weight 13 by the movement restraint portion on the left end portion of the front weight can be very simple. Further, since the upward movement of the rear weight 14 is suppressed by the large weight of the rear weight 14, the right end of the rear weight 14 is restrained by the upper movement restraint portion of the right end of the rear weight, and the rear side is restrained. The restraint of the left end portion of the rear weight 14 by the upper left end portion of the weight restraint portion can be very simple.

(17) Further, in the configuration of the fourth modification, the right end portion of the front lower weight 61 is a front upper weight right end upper movement restraining portion that simply restrains the upward movement of the front upper weight 62 right end portion. Further, the left end portion of the front lower weight 61 may further have a front upper weight left end upper movement restraining portion that simply restrains the upward movement of the front upper weight 62. good. Further, the right end portion of the rear lower weight 71 may further have a rear upper weight right end upper movement restraining portion that simply restrains the upward movement of the rear upper weight 72. The left end portion of the lower side weight 71 may further have a rear upper weight left end upper movement restraining portion that simply restrains the upward movement of the left end portion of the rear upper weight 72.

Even with such a configuration, the upward movement of the front side upper weight 62 is suppressed by the weight of the front side upper weight 62, so that the right end portion of the front side upper weight 62 by the front side upper weight right end upper movement restraint portion is suppressed. The restraint and the restraint of the left end portion of the front side upper weight 62 by the front side upper weight upper left end upper movement restraint portion can be very simple. Further, since the upward movement of the rear upper weight 72 is suppressed by the weight of the rear upper weight 72, the rear upper weight 72 is restrained by the rear upper weight right end upper movement restraining portion and the right end portion of the rear upper weight 72 is restrained. , The restraint of the left end portion of the rear side upper weight 72 by the rear side upper weight upper movement restraint portion can be very simple.

[Outline of Embodiment and Modification]
The embodiment and the modification are summarized below.

The construction machine according to the embodiment and the modification includes a crawler-type lower traveling body that can run on its own, and an upper turning body that is rotatably mounted on the lower running body. The lower traveling body is a car body that supports the upper turning body from below so that the upper turning body can turn, and a left crawler unit that is separately arranged on the left and right sides of the car body and is responsible for running the car body. And a right crawler unit, and front and rear weights separately arranged in front of and behind the car body. The right crawler unit has a right crawler frame that is connected to the right end of the car body and extends in the front-rear direction. The left crawler unit has a left crawler frame that is connected to the left end of the car body and extends in the front-rear direction. The right crawler frame has a front portion of the right crawler frame projecting forward from the front end of the car body and a rear portion of the right crawler frame projecting rearward from the rear end of the car body. The left crawler frame has a front portion of the left crawler frame projecting forward from the front end of the car body and a rear portion of the left crawler frame projecting rearward from the rear end of the car body. The front part of the right crawler frame is a right front pedestal on which the right end portion of the front weight can be mounted, and the right front pedestal that supports the right end portion from below with the right end portion of the front weight mounted, and the right front portion. It has a right front restraint portion that restrains the movement of the right end portion of the front weight mounted on the frame in the front-rear direction and to the right. The front part of the left crawler frame is a left front pedestal on which the left end portion of the front weight can be mounted, and the left front pedestal that supports the left end portion from below with the left end portion of the front weight mounted, and the left front portion. It has a left front restraint portion that restrains the movement of the left end portion of the front weight mounted on the frame in the front-rear direction and to the left. The rear part of the right crawler frame is a right rear pedestal on which the right end of the rear weight can be placed, and is a right rear pedestal that supports the right end from below with the right end of the rear weight mounted. It has a right rear restraining portion that restrains the movement of the right end portion of the rear weight mounted on the right rear pedestal in the front-rear direction and to the right. The rear portion of the left crawler frame is a left rear pedestal on which the left end portion of the rear weight can be mounted, and is a left rear pedestal that supports the left end portion from below with the left end portion of the rear weight placed mounted. It has a left rear restraining portion that restrains the movement of the left end portion of the rear weight mounted on the left rear pedestal in the front-rear direction and to the left.

In this construction machine, the heavy weight of the weight can be used to fix the front and rear weights between the left and right crawler frames by combining the weight placement on the gantry and the horizontal weight restraint by the restraint part. , The weight can be fixed between the left and right crawler frames with a simple operation. Specifically, by placing the front weights on the left and right front mounts and placing the rear weights on the left and right rear mounts, the heavy weights of the front and rear weights are used to move the weights up and down. Can restrain movement in the direction. The movement of the front and rear weights in the front-rear direction and the left-right direction other than the vertical direction is the restraint of the front weight by the right front restraint portion and the left front restraint portion and the rear weight by the right rear restraint portion and the left rear restraint portion. Since it can be achieved by the restraint of the left and right, the front weight is placed on the left and right front mounts, the front weight is restrained by the left and right front restraint parts, and the rear weight is placed on the left and right rear mounts. The front and rear weights can be fixed between the left and right crawler frames by a very simple operation of restraining the rear weight with the restraining portion.

Further, in this construction machine, the front weight and the rear weight fixed between the left and right crawler frames can be used as scaffolding to facilitate the movement of workers and the like between the left and right crawler units. Further, in this construction machine, the front weight and the rear weight fixed between the left and right crawler frames can counter the bending moment in the left and right directions generated in the left and right crawler frames when the lower traveling body is turned. The bending moment in the left-right direction can be reduced.

Therefore, in this construction machine, while facilitating the movement of workers and the like between the left and right crawler units and reducing the bending moment in the left and right directions generated in the left and right crawler frames when the lower traveling body is turned, the front side and the front side and The rear weight can be fixed between the left and right crawler frames with a simple operation.

At least one of the right end of the front weight, the left end of the front weight, the right end of the rear weight, and the left end of the rear weight is a constrained end having a recess that opens downward. At least one of the right front restraint portion, the left front restraint portion, the right rear restraint portion, and the left rear restraint portion is a crawler frame restraint portion that restrains the movement of the restrained end portion, and the crawler frame. The restraining portion may be a convex portion that fits into the concave portion so as to restrain the movement of the restrained end portion in the front-rear direction and the movement in the lateral direction outward.

According to this configuration, the restrained end is placed on the corresponding one of the right front pedestal, the left front pedestal, the right rear pedestal and the left rear pedestal, and at the same time, the crawler frame is restrained from below in the recess of the restrained end. The convex portion of the portion can be fitted to restrain the movement of the restrained end portion in the front-rear direction and the left-right direction outward. Therefore, the work related to the restraint of the restrained end portion can be simplified.

The crawler frame restraint portion has an upper side surface that is an upward facing surface, and the upper side surface includes a front side inclined portion that inclines downward from a predetermined position in the front-rear direction of the upper side surface toward the front. It may have a rear inclined portion that inclines downward from the predetermined location toward the rear.

According to this configuration, when the restrained end is placed on the corresponding one of the right front pedestal, the left front pedestal, the right rear pedestal and the left rear pedestal, the recess of the restrained end is relative to the crawler frame restraint. Even if the position is displaced in the front-rear direction and the leading edge or trailing edge of the recess abuts on the upper side surface of the crawler frame restraint portion, the front inclined portion and the rear side of the upper side surface of the crawler frame restraint portion. The inclination of the inclined portion can guide the restrained end portion to the position where the concave portion fits with the crawler frame restraining portion. Therefore, the recessed portion of the restrained end portion and the crawler frame restraint portion can be fitted without any trouble.

Further, even if the crawler frame restraint portion has an upper side surface that is a surface facing upward, the upper side surface has an inner inclined portion that inclines downward as it goes inward in the left-right direction. good.

According to this configuration, when the restrained end is placed on the corresponding one of the right front pedestal, the left front pedestal, the right rear pedestal and the left rear pedestal, the recess of the restrained end is relative to the crawler frame restraint. Even if the position is displaced outward in the left-right direction and the inner edge of the concave portion in the left-right direction abuts on the inner inclined portion of the upper side surface of the crawler frame restraint portion, the inner inclined portion is constrained by the inclination of the inner inclined portion. The end can be guided to the position where the recess fits with the crawler frame restraint. Therefore, the recessed portion of the restrained end portion and the crawler frame restraint portion can be fitted without any trouble.

Further, in a configuration in which the upper side surface has the front side inclined portion and the rear side inclined portion, the upper side surface is located inside the front side inclined portion and the rear side inclined portion in the left-right direction. It may further have an inwardly inclined portion that inclines downward as it goes inward in the left-right direction.

According to this configuration, when the restrained end is placed on the corresponding one of the right front pedestal, the left front pedestal, the right rear pedestal and the left rear pedestal, the recess of the restrained end becomes the crawler frame restraint. On the other hand, even if the position is displaced in the front-rear direction, or even if the concave portion of the restrained end is displaced outward in the left-right direction with respect to the crawler frame restraint portion, the front inclined portion and the rear inclined portion are displaced. The inclined end portion can be guided to the position where the concave portion fits with the crawler frame restraint portion by each inclination of the inner inclined portion. Therefore, the recessed portion of the restrained end portion and the crawler frame restraint portion can be fitted without any trouble.

At least one of the right end of the front weight, the left end of the front weight, the right end of the rear weight, and the left end of the rear weight has a weight through hole that penetrates the end up and down. At least one of the right front pedestal, the left front pedestal, the right rear pedestal, and the left rear pedestal is a crawler frame pedestal on which the restrained end is mounted. The crawler frame pedestal has a pedestal through hole that penetrates the crawler frame pedestal up and down, and at least one of the right front restraint portion, the left front restraint portion, the right rear restraint portion, and the left rear restraint portion. One is a crawler frame restraining portion that restrains the movement of the restrained end portion, and the crawler frame restraining portion is inserted into the gantry through hole and fixed to the crawler frame pedestal, and the restrained end portion. It may be a restraining pin inserted into the weight through hole so as to restrain the movement in the front-back direction and the left-right direction.

In this configuration, the restraint pin can restrain the movement of the restrained end portion in the front-rear direction and can restrain the movement of the restrained end portion to the left and right sides, so that the movement of the restrained end portion can be restrained more stably. ..

At least one of the right end of the front weight, the left end of the front weight, the right end of the rear weight and the left end of the rear weight is the right front pedestal, the left front pedestal, the right rear pedestal and At the restrained end having a weight main body end mounted on the crawler frame pedestal, which is the corresponding pedestal of the left rear pedestal, and a weight end protrusion protruding downward from the weight main body end. At least one of the right front restraint portion, the left front restraint portion, the right rear restraint portion, and the left rear restraint portion is a crawler frame restraint portion that restrains the movement of the restrained end portion, and the crawler. The frame restraint portion is provided with an insertion hole into which the weight end protrusion can be inserted from above at the same time as the weight main body end is placed on the crawler frame frame, and is inserted into the insertion hole. It may have a protrusion coupling portion that is coupled to the weight end protrusion so as to restrain the movement of the weight end protrusion in the front-rear direction and the left-right direction.

According to this configuration, the end of the weight body is placed on the crawler frame frame, and at the same time, the weight end protrusion is inserted into the insertion hole of the protrusion joint so that the weight end protrusion can be moved in the front-rear direction and the left-right direction. The movement can be constrained, thereby constraining the movement of the constrained end in the anteroposterior and lateral directions. Therefore, the work related to the restraint of the restrained end portion can be simplified.

It is preferable that the weight end protrusion has a tapered portion whose diameter becomes smaller toward the tip in the protruding direction of the weight end protrusion from the weight main body end.

According to this configuration, when the end of the weight body is placed on the crawler frame frame, the protrusion of the weight end is slightly displaced in the front-rear direction and / or the left-right direction with respect to the insertion hole of the protrusion joint. Also, since the weight end protrusion has the tapered portion, the weight end protrusion can be inserted into the insertion hole.

The lower traveling body further includes a front upper weight configured to be loadable on the front weight and a rear upper weight configured to be loadable on the rear weight, and the front weight is said to be said. The front weight right restraint portion that restrains the movement of the right end portion of the front side upper weight placed on the front side weight in the front-rear direction and to the right, and the left end portion of the front side upper weight placed on the front side weight. The posterior weight has a front weight left restraining portion that constrains the movement in the front-rear direction and the leftward direction, and the rear weight is the front-rear direction of the right end portion of the rear upper weight mounted on the rear weight. And the rear weight that restrains the movement to the right, and the rear weight that restrains the movement of the left end of the rear upper weight placed on the rear weight in the front-rear direction and to the left. It may have a left restraint portion.

According to this configuration, it is possible to adjust the weight of the weight loaded on the left front pedestal and the right front pedestal, and the weight of the weight loaded on the left rear pedestal and the right rear pedestal, and the construction machine. Even if the loading capacity is relatively low when disassembling and transporting, the front weight, the front upper weight, the rear weight and the rear upper weight can be transported, and the left front pedestal and the right front pedestal can be transported. Suspension work of those weights for loading the front weight and the front upper weight on top, and suspension of those weights for loading the rear weight and the rear upper weight on the left rear pedestal and the right rear pedestal. The work can be facilitated, and the lifting work can be performed by an auxiliary crane having a relatively low lifting capacity. Furthermore, the front upper weight is fixed to the front weight and the rear upper weight is fixed to the rear weight. The effect is that it can be fixed with a simple operation.

Specifically, in this configuration, it is possible to select whether or not to further load the front upper weight on the front weight loaded on the left front pedestal and the right front pedestal, so that the front upper weight is loaded on the front weight. The weight of the weight loaded on the left front pedestal and the right front pedestal can be adjusted depending on the presence or absence of Since it is possible to select whether or not to load the upper weight, the weight of the weight to be loaded on the left rear pedestal and the right rear pedestal can be adjusted depending on whether or not the rear upper weight is loaded on the rear weight. Further, in this configuration, when the construction machine is disassembled and transported, the front weight and the front upper weight can be separated and transported separately, and the rear weight and the rear upper weight can be separated and separately transported. Can be transported to. The weights of the front weight and the front upper weight are smaller than the total weight of the front weight and the front upper weight in a stacked state, and the weights of the rear weight and the rear upper weight are stacked on each other. It is less than the total weight of the posterior weight and the posterior upper weight in the squeezed state. Therefore, in this configuration, even a transport vehicle having a relatively low loading capacity can transport each of the front weight, the front weight, the rear weight, and the rear weight. Further, in this configuration, the front weight and the front upper weight can be individually lifted and stacked on the left front pedestal and the right front pedestal, and the rear weight and the rear upper weight can be individually lifted to the left rear pedestal and the left rear pedestal. Can be stacked on the right rear stand. As described above, the weight of each of the front weight and the front upper weight is smaller than the total weight of the front weight and the front upper weight, and the weight of each of the rear weight and the rear upper weight is the rear weight and the rear weight. Since it is smaller than the total weight of the side upper weights, in this configuration, the front side weights and the front side upper weights for stacking the front side weights and the front side upper weights on the left front pedestal and the right front pedestal are individually suspended. , The rear weight and the rear upper weight for stacking the rear weight and the rear upper weight on the left rear pedestal and the right rear pedestal can be easily suspended, and the suspension capacity is relatively low. Even an auxiliary crane can carry out those suspension operations. Further, in this configuration, the weight of the front upper weight is used to place the front upper weight on the front weight and to restrain the front upper weight in the horizontal direction by the front weight right restraint portion and the front weight left restraint portion. Since the front upper weight can be fixed to the front weight in combination, the front upper weight can be fixed to the front weight with a simple operation. Similarly, using the weight of the rear upper weight, the rear upper weight is placed on the rear weight, and the rear upper weight is placed on the rear weight, and the rear upper weight is placed on the rear weight. Since the rear upper weight can be fixed to the rear weight in combination with the weight restraint, the rear upper weight can be fixed to the rear weight with a simple operation.

At least one of the right end of the anterior upper weight, the left end of the anterior upper weight, the right end of the posterior upper weight, and the left end of the posterior upper weight is an upper weight that is a recess that opens downward. The upper weight restrained end portion having a recess, and at least one of the front weight right restraint portion, the front weight left restraint portion, the rear side weight right restraint portion, and the rear side weight left restraint portion is described above. It is a weight restraining portion that restrains the movement of the upper weight restrained end portion, and the weight restraining portion is said to restrain the movement of the upper weight restrained end portion in the front-rear direction and the lateral movement in the left-right direction. It may be a convex portion that fits into the upper weight concave portion.

According to this configuration, the restrained end of the upper weight is placed on the corresponding right end of the front weight, the left end of the front weight, the right end of the rear weight and the left end of the rear weight at the same time. The convex portion of the weight restraining portion can be fitted into the upper weight concave portion from the lower side to restrain the movement of the upper weight restrained end portion in the front-rear direction and the left-right direction outward. Therefore, it is possible to simplify the work related to the restraint of the upper weight restrained end portion.

The weight restraint portion has an upper side surface of the weight restraint portion, which is a surface facing upward, and the upper side surface of the weight restraint portion is directed downward from a predetermined position in the front-rear direction of the upper side surface of the weight restraint portion. It may have a weight restraining portion front inclined portion that inclines toward the rear, and a weight restraining portion rearward inclined portion that inclines downward from the predetermined position toward the rear.

According to this configuration, when the restrained end of the upper weight is placed on the corresponding right end of the front weight, the left end of the front weight, the right end of the rear weight and the left end of the rear weight. If the upper weight recess is displaced forward with respect to the weight restraint and the trailing edge of the upper weight recess abuts on the posterior inclined portion of the weight restraint on the upper side surface of the weight restraint, the weight restraint is performed. By inclining the inclined portion on the rear side of the portion, the upper weight restrained end portion can be guided to the position where the upper weight concave portion fits into the weight restraining portion. Further, when the upper weight recess is displaced to the rear side with respect to the weight restraint portion and the leading edge of the upper weight recess is in contact with the weight restraint front side inclined portion on the upper side surface of the weight restraint portion, the weight is used. By inclining the inclined portion on the front side of the restraining portion, the upper weight restrained end portion can be guided to the position where the upper weight concave portion fits into the weight restraining portion. Therefore, when the upper weight restrained end is placed on the corresponding one of the right end of the front weight, the left end of the front weight, the right end of the rear weight, and the left end of the rear weight, the upper weight is placed. Even when the recess is displaced in the front-rear direction with respect to the weight restraint portion, the upper weight recess and the weight restraint portion can be fitted without any trouble.

The weight restraint portion has an upper side surface of the weight restraint portion which is a surface facing upward, and the upper side surface of the weight restraint portion is an inclined portion inside the weight restraint portion which is inclined downward as it goes inward in the left-right direction. May have.

According to this configuration, when the restrained end of the upper weight is placed on the corresponding right end of the front weight, the left end of the front weight, the right end of the rear weight and the left end of the rear weight. When the upper weight recess is displaced outward in the left-right direction with respect to the weight restraint portion, and the inner edge of the upper weight recess in the left-right direction abuts on the inner inclined portion of the weight restraint portion on the upper side surface of the weight restraint portion. Even if there is, the inclination of the inner inclined portion of the weight restraining portion can guide the upper weight restrained end portion to the position where the upper weight concave portion fits into the weight restraining portion. Therefore, the fitting of the upper weight recess and the weight restraining portion can be performed without any trouble.

Further, in a configuration in which the upper side surface of the weight restraint portion has the front side inclined portion of the weight restraint portion and the rear side inclined portion of the weight restraint portion, the upper side surface of the weight restraint portion is the front side inclined portion of the weight restraint portion and the weight restraint portion. It may further have a weight restraining portion inner inclined portion that is located inward in the left-right direction with respect to the portion rearward inclined portion and is inclined downward as it goes inward in the left-right direction.

According to this configuration, when the restrained end of the upper weight is placed on the corresponding right end of the front weight, the left end of the front weight, the right end of the rear weight and the left end of the rear weight. When the upper weight recess is displaced outward in the left-right direction with respect to the weight restraint portion, and the inner edge of the upper weight recess in the left-right direction abuts on the inner inclined portion of the weight restraint portion on the upper side surface of the weight restraint portion. Even if there is, the inclination of the inner inclined portion of the weight restraining portion can guide the upper weight restrained end portion to the position where the upper weight concave portion fits into the weight restraining portion. Therefore, the fitting of the upper weight recess and the weight restraining portion can be performed without any trouble.

As described above, according to the embodiment and the modification, it is easy for the operator and the like to move between the left and right crawler units, and the bending moment in the left and right directions generated in the left and right crawler frames when the lower traveling body is turned. A construction machine is provided that can fix the weight of the lower traveling body between the left and right crawler frames with a simpler operation while achieving the reduction.

Claims (13)

1. A self-propelled crawler type lower traveling body and
   The upper swivel body, which is mounted so as to be swivelable on the lower traveling body, is provided.
   The lower traveling body is a car body that supports the upper turning body from below so that the upper turning body can turn, and a left crawler unit that is separately arranged on the left and right sides of the car body and is responsible for running the car body. And a right crawler unit, and front and rear weights separately arranged in front of and behind the car body.
   The right crawler unit has a right crawler frame that is connected to the right end of the car body and extends in the front-rear direction.
   The left crawler unit has a left crawler frame that is connected to the left end of the car body and extends in the front-rear direction.
   The right crawler frame has a right crawler frame front portion that protrudes forward from the front end of the car body and a right crawler frame rear portion that protrudes rearward from the rear end of the car body.
   The left crawler frame has a left crawler frame front portion that protrudes forward from the front end of the car body and a left crawler frame rear portion that protrudes rearward from the rear end of the car body.
   The front part of the right crawler frame is a right front pedestal on which the right end portion of the front weight can be mounted, and the right front pedestal that supports the right end portion from below with the right end portion of the front weight mounted, and the right front portion. It has a right front restraint portion that restrains the movement of the right end portion of the front weight mounted on the frame in the front-rear direction and to the right.
   The front part of the left crawler frame is a left front pedestal on which the left end portion of the front weight can be mounted, and the left front pedestal that supports the left end portion from below with the left end portion of the front weight mounted, and the left front portion. It has a left front restraint portion that restrains the movement of the left end portion of the front weight mounted on the frame in the front-rear direction and to the left.
   The rear part of the right crawler frame is a right rear pedestal on which the right end of the rear weight can be placed, and is a right rear pedestal that supports the right end from below with the right end of the rear weight mounted. It has a right rear restraining portion that restrains the movement of the right end portion of the rear weight mounted on the right rear pedestal in the front-rear direction and to the right.
   The rear portion of the left crawler frame is a left rear pedestal on which the left end portion of the rear weight can be mounted, and is a left rear pedestal that supports the left end portion from below with the left end portion of the rear weight placed mounted. A construction machine having a left rear restraint portion for restraining the movement of the left end portion of the rear weight on the left rear mount in the front-rear direction and to the left.
2. In the construction machine according to claim 1,
   At least one of the right end of the front weight, the left end of the front weight, the right end of the rear weight and the left end of the rear weight is a constrained end having a recess that opens downward. ,
   At least one of the right front restraint portion, the left front restraint portion, the right rear restraint portion, and the left rear restraint portion is a crawler frame restraint portion that restrains the movement of the restrained end portion, and the crawler frame restraint portion. The portion is a construction machine that is a convex portion that fits into the concave portion so as to restrain the movement of the restrained end portion in the front-rear direction and the outward movement in the left-right direction.
3. In the construction machine according to claim 2,
   The crawler frame restraint portion has an upper side surface which is a surface facing upward.
   The upper side surface has a front inclined portion that inclines downward from a predetermined position in the front-rear direction of the upper side surface and a rear inclined portion that inclines downward from the predetermined location toward the rear. And, with, construction machinery.
4. In the construction machine according to claim 2,
   The crawler frame restraint portion has an upper side surface which is a surface facing upward.
   The upper side surface is a construction machine having an inner inclined portion that inclines downward toward the inside in the left-right direction.
5. In the construction machine according to claim 3,
   The upper side surface further has an inner inclined portion that is located inward in the left-right direction with respect to the front inclined portion and the rear inclined portion and is inclined downward as it goes inward in the left-right direction. machine.
6. In the construction machine according to claim 1,
   At least one of the right end of the front weight, the left end of the front weight, the right end of the rear weight and the left end of the rear weight has a weight through hole that penetrates the end up and down. It is a restrained end and
   At least one of the right front pedestal, the left front pedestal, the right rear pedestal, and the left rear pedestal is a crawler frame pedestal on which the restrained end is mounted, and the crawler frame pedestal is a crawler frame pedestal. , Has a pedestal through hole that penetrates the crawler frame pedestal up and down,
   At least one of the right front restraint portion, the left front restraint portion, the right rear restraint portion, and the left rear restraint portion is a crawler frame restraint portion that restrains the movement of the restrained end portion, and the crawler frame restraint portion. The portion is inserted into the weight through hole and fixed to the crawler frame frame, and is inserted into the weight through hole so as to restrain the movement of the restrained end portion in the front-rear direction and the left-right direction. A construction machine that is a pin.
7. In the construction machine according to claim 1,
   At least one of the right end of the front weight, the left end of the front weight, the right end of the rear weight and the left end of the rear weight is the right front pedestal, the left front pedestal, the right rear pedestal and At the restrained end having a weight main body end mounted on the crawler frame pedestal, which is the corresponding pedestal of the left rear pedestal, and a weight end protrusion protruding downward from the weight main body end. can be,
   At least one of the right front restraint portion, the left front restraint portion, the right rear restraint portion, and the left rear restraint portion is a crawler frame restraint portion that restrains the movement of the restrained end portion, and the crawler frame restraint portion. The portion is provided with an insertion hole into which the weight end protrusion can be inserted from above at the same time as the weight main body end is placed on the crawler frame frame, and the portion is inserted into the insertion hole. A construction machine having a protrusion joint that connects to a weight end protrusion so as to constrain the movement of the weight end protrusion in the front-rear direction and the left-right direction.
8. In the construction machine according to claim 7.
   The weight end protrusion is a construction machine having a tapered portion whose diameter becomes smaller toward the tip in the protrusion direction of the weight end protrusion from the weight main body end.
9. In the construction machine according to any one of claims 1 to 8.
   The lower traveling body further includes a front upper weight configured to be loadable on the front weight and a rear upper weight configured to be loadable on the rear weight.
   The front weight is a front weight right restraining portion that restrains the movement of the right end portion of the front upper weight placed on the front weight in the front-rear direction and to the right, and the front weight placed on the front weight. It has a front weight left restraint portion that restrains the movement of the left end portion of the front side upper weight in the front-rear direction and to the left.
   The rear weight is placed on the rear weight right restraining portion for restraining the movement of the right end portion of the rear upper weight placed on the rear weight in the front-rear direction and to the right, and on the rear weight. A construction machine having a rear weight left restraint portion that restrains the movement of the left end portion of the rear rear upper weight mounted in the front-rear direction and to the left.
10. In the construction machine according to claim 9.
    At least one of the right end of the anterior upper weight, the left end of the anterior upper weight, the right end of the posterior upper weight, and the left end of the posterior upper weight is an upper weight that is a concave portion that opens downward. An upper weight restrained end having a recess,
    At least one of the front weight right restraint portion, the front weight left restraint portion, the rear side weight right restraint portion, and the rear side weight left restraint portion is a weight that restrains the movement of the upper weight restrained end portion. It is a restraining portion, and the weight restraining portion is a convex portion that fits into the upper weight recess so as to restrain the movement of the upper weight restrained end portion in the front-rear direction and the outward movement in the left-right direction. Construction machinery.
11. In the construction machine according to claim 10,
    The weight restraint portion has an upper side surface of the weight restraint portion, which is a surface facing upward.
    The upper side surface of the weight restraint portion has a front inclined portion of the weight restraint portion that inclines downward from a predetermined position in the front-rear direction of the upper side surface of the weight restraint portion toward the front, and a downward inclination portion toward the rear from the predetermined location. A construction machine having a weight restraint portion that inclines toward it and a rearward inclined portion.
12. In the construction machine according to claim 10,
    The weight restraint portion has an upper side surface of the weight restraint portion, which is a surface facing upward.
    The upper side surface of the weight restraint portion is a construction machine having an inner inclined portion of the weight restraint portion that is inclined downward as it goes inward in the left-right direction.
13. In the construction machine according to claim 11,
    The upper side surface of the weight restraining portion is located inward in the left-right direction with respect to the front inclined portion of the weight restraining portion and the rear inclined portion of the weight restraining portion, and is inclined downward as it goes inward in the left-right direction. A construction machine that further has an inner slope of the weight restraint.

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