JP2017119582A - Upper revolving structure of mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable transportation of a frame of an upper revolving structure during transportation of a crane even when a dimension of a boom is expanded in a crosswise direction to inhibit deflection of the boom occurring in the crosswise direction.SOLUTION: An upper revolving structure 16 of a crane 10 includes: a revolving frame 20 which is mounted on a lower running structure 12 so as to freely revolve; and a boom 40 which is provided at the revolving frame 20 so as to freely rise and fall. The revolving frame 20 includes: a pair of attachment brackets 39 where a base end part 40f of the boom 40 is attached so that the boom 40 freely rises and falls; and a front side frame 21 where the pair of attachment brackets 39 is provided so as to be spaced away from each other in a crosswise direction of the upper revolving structure 16. A dimension of the front side frame 21 in a forward-backward direction of the upper revolving structure 16 which intersects with the crosswise direction is smaller than a dimension of the front side frame 21 in the crosswise direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an upper swing body of a mobile crane.

  2. Description of the Related Art Conventionally, a crane including an upper swing body that is mounted on a lower main body so as to be rotatable is known. The upper swing body of the crane includes a swing frame that is mounted on the lower body so as to be swingable, and a boom that is mounted on the swing frame so as to be able to move up and down. The following Patent Documents 1 to 4 disclose examples of such cranes.

JP 2007-191286 A JP 2007-119180 A Japanese Patent No. 3939819 JP 2010-195542 A

  By the way, there is a case where a force in the left-right direction is applied to the boom due to an inertial force or a wind effect due to the turning of the upper turning body. In this case, the boom bends in the left-right direction. In particular, in recent years, with the increase in the size of the crane and the length of the boom, the amount of deflection of the boom in the left-right direction tends to increase. Under such circumstances, the structure of the conventional upper-part turning body cannot sufficiently suppress the bending of the boom in the left-right direction, and as a result, the work for receiving the limitation of the suspension load is increasing.

  The present invention has been made to solve the above-described problems, and an object thereof is to suppress the bending of the boom in the left-right direction.

  In order to achieve the above object, for example, it is conceivable to increase the horizontal dimension (width) of the boom to increase the horizontal rigidity of the boom. However, in this case, there arises a problem that it becomes difficult to transport the swing frame of the upper swing body during transport of the crane. The reason is as follows.

As described in each of the above patent documents, a crane may be transported after being disassembled into various devices and members constituting the crane, and is configured to be easily disassembled into units suitable for transport. ing. An upper swing body of a conventional crane has a structure schematically shown in FIG. The upper swing body includes a swing frame 720 and a boom 740 having a base end portion attached to a pair of mounting brackets 721 provided at a front portion of the swing frame 720. When transporting the crane, the upper swing body is removed from the lower main body, and is disassembled into a swing frame 720, a boom 740, and various devices and members mounted on the swing frame 720. The crane is generally transported by a transport vehicle such as a trailer. Among the members constituting the upper swing body, the swing frame 720 has a left-right direction that coincides with a left-right direction (vehicle width direction) of the transport vehicle, and The vehicle is loaded on the transport vehicle in a state in which the front-rear direction coincides with the front-rear direction (vehicle length direction) of the transport vehicle. For vehicles traveling on public roads, the limit value in the left-right direction including the load, that is, the transport limit width is stipulated by law, so the crane components are also left-right when loaded on the transport vehicle. Is required to be within the transport limit. However, increasing the lateral dimension W _B of the boom 740 in order to suppress deflection in the horizontal direction of the boom 740, it is necessary to enlarge the distance between the mounting bracket 721 having a base end portion of the boom 740 is attached, the result, lateral dimension (width) _{W F} also increases inevitably of the revolving frame 720. In this case, the dimension W _F in the lateral direction of the revolving frame 720 of the pivot frame 720 when transported loaded on a transport vehicle as described above exceeds the transportation limit width, resulting impossible transported rotating frame 720 There is a fear.

  Therefore, in order to solve this problem, the inventor of the present application has invented the upper swing body of the mobile crane as follows.

  The upper swing body of the mobile crane according to the present invention is an upper swing body mounted on the lower traveling body of the mobile crane, and a swing frame mounted so as to be turnable on the lower traveling body; And a pair of mounting brackets to which a base end portion of the boom is attached so that the boom can be raised and lowered, and the pair of attachments. A bracket body provided with an interval in the left-right direction of the upper swing body, and the frame body is composed of a plurality of divided frames arranged in a line in the left-right direction of the upper swing body, Adjacent divided frames of the plurality of divided frames are coupled in a state where they can be separated from each other.

  In the upper revolving structure of this mobile crane, the horizontal dimension of the boom is increased in order to improve the horizontal rigidity of the boom and suppress the horizontal deflection of the boom, and the base end of the boom is Even when the distance between the pair of mounting brackets to be mounted and the horizontal dimension of the frame main body on which the pair of mounting brackets are provided are enlarged, the frame main body is composed of a plurality of divided frames arranged in the left-right direction and adjacent divided frames Can be separated from each other, so when transporting a mobile crane, if the frame body is disassembled into each divided frame and loaded on a transport vehicle, the transport width of the swivel frame can be reduced, It becomes possible to prevent the transport width of the swivel frame from exceeding the transport limit width of the public road. Therefore, in this mobile crane's upper swing body, even if the boom's left and right dimensions are enlarged to suppress the boom's horizontal deflection, the upper swing body's swing frame is transported during transport of the mobile crane. can do.

  In this case, the plurality of divided frames are provided with a central divided frame attached so as to be turnable on the lower traveling body, and disposed on the right side of the central divided frame at the right end of the central divided frame. It is preferable that a right divided frame coupled in a separable state and a left divided frame disposed on the left side of the central divided frame and coupled in a separable state at the left end of the central divided frame are included.

  In this configuration, the frame main body can be constituted by the central divided frame and the left divided frame and the right divided frame arranged on the left and right of the central divided frame. Can be improved.

  Further, in this case, the left side surface of the left divided frame is inclined so as to approach the right side surface of the left divided frame as it goes rearward, and the right side surface of the right divided frame is the left side of the right frame as it goes backward It is preferable to be inclined so as to approach the surface.

  According to this configuration, in the state in which the left divided frame and the right divided frame are coupled to the central divided frame, the left and right dimensions of the front portion of the frame main body that are necessary for enlarging the left and right dimensions of the boom body Can be kept large, and the increase in the weight of the revolving frame can be suppressed by reducing the size in the left and right direction of the rear portion of the frame body, which is not related to the increase in the size in the left and right direction of the boom.

  The mobile crane has a turning support attached to the lower traveling body, and supports the upper turning body so that the upper turning body can turn freely with respect to the lower traveling body. The upper swing body is mounted on the lower traveling body via the swing support so as to be rotatable, and is arranged on the plurality of divided frames so as to be aligned in the left-right direction of the upper swing body. A left frame and a right frame that are coupled in a separable manner, and the swivel frame is disposed below the left frame and the right frame so as to straddle the left frame and the right frame. A lower frame coupled in a separable manner to the left frame and the right frame, and a swivel support body that is a part to which the swivel support is attached. As provided in the lower frame a part, preferably further comprising a.

  In the upper swing body of the mobile crane, the boom has a lower boom which is attached to the pair of mounting brackets and forms a specific length range from the base end portion to the tip end side of the boom, It is preferable that the dimension of the said lower boom in the left-right direction becomes large as it goes to the base end part side of the said lower boom.

  According to this structure, the rigidity in the left-right direction in the vicinity of the base end portion of the boom can be increased, and the deflection of the boom in the left-right direction can be suppressed. In addition, according to this configuration, since the horizontal dimension of the lower boom decreases toward the distal end side of the lower boom, the lateral dimension of the lower boom is constant and large from the base end to the distal end. In comparison, an increase in the weight of the lower boom can be suppressed.

  In this case, the lower boom is composed of a plurality of divided booms arranged side by side in the left-right direction, and adjacent divided booms of the plurality of divided booms are coupled in a separable state. Is preferred.

  According to this configuration, even when the lower boom is configured so that the horizontal dimension of the lower boom increases toward the base end side and the rigidity in the left-right direction near the base end portion of the boom is improved, When transporting a crane, dividing the lower boom into a plurality of divided booms can reduce the transport width of the lower boom and prevent the transport width of the lower boom from exceeding the transport limit on public roads. Become.

  Further, in this case, the plurality of split booms include a central split boom, a left split boom that is arranged on the left side of the central split boom and is detachably coupled to the central split boom, and the center It is preferable to include a right split boom that is arranged on the right side of the split boom and is detachably coupled to the central split boom.

  According to this configuration, the lower boom can be configured by the central split boom, the left split boom and the right split boom arranged on the left and right of the central split boom, and therefore the lower boom in terms of structure and strength. The balance can be improved.

  Furthermore, in this case, the left side surface of the left split boom is inclined so as to move away from the right side surface of the left split boom toward the base end of the lower boom, and the right side surface of the right split boom is It is preferable to incline so that it may go away from the left side surface of the said right side division | segmentation boom as it goes to the base end part side of a boom.

  As described above, according to the present invention, even when the horizontal dimension of the boom is increased to suppress the horizontal deflection of the boom, the frame of the upper swing body is transported when the mobile crane is transported. be able to.

It is the schematic diagram which looked at the crane with which the upper turning body by 1st Embodiment of this invention was applied from the right side. It is the figure which looked at the upper turning body shown in FIG. 1 from the top (from the direction of arrow II). It is a disassembled perspective view of the turning frame of the upper turning body shown in FIG. It is a figure which shows typically the coupling | bonding structure of the front side coupling bracket and rear side coupling bracket of the revolving frame shown in FIG. 3 in the state seen from the top. It is the figure which looked at the joint part of the front frame and back frame by the modification 1 of 1st Embodiment from the side. It is FIG. 2 equivalent view of the modification 2 of 1st Embodiment. It is a VII arrow line view of FIG. It is FIG. 2 equivalent view of the modification 3 of 1st Embodiment. FIG. 3 is a diagram corresponding to FIG. 2 of the second embodiment. It is FIG. 2 equivalent view of the modification 1 of 2nd Embodiment. It is a XI arrow line view of FIG. It is FIG. 2 equivalent view of the modification 2 of 2nd Embodiment. FIG. 6 is a view corresponding to FIG. 5 of another modified example. FIG. 6 is a view corresponding to FIG. 5 of another modification. FIG. 9 is a view corresponding to FIG. 2 showing an upper swing body according to a modified example. FIG. 16 is a view corresponding to FIG. 2 showing an upper swing body according to a further modification of the modification of FIG. 15. FIG. 3 is a view corresponding to FIG. 2 showing a conventional upper swing body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
With reference to FIGS. 1-4, the structure of the upper turning body of the crane by 1st Embodiment of this invention is demonstrated.

  The upper turning body 16 according to the first embodiment is used in a crane 10 as shown in FIG. The crane 10 can be disassembled into a plurality of components. The crane 10 takes the assembled state shown in FIG. 1 when performing a lifting operation, and is disassembled into a plurality of components when transported and loaded on a transport vehicle (such as a truck or a trailer). Take the disassembled and transported state. When transport vehicles travel on public roads, it is necessary to comply with the size restrictions stipulated by laws and regulations. Therefore, when transporting cranes, they must be large enough to fit within the size limits when loaded on transport vehicles. The crane needs to be disassembled into unit components. In addition, there are limit values for the length in the front-rear direction of the transport vehicle and limit values for the width in the left-right direction of the transport vehicle. The width limit value in the left-right direction is smaller than that in the left-right direction. Although the crane 10 can be in the assembled state and the disassembled transport state as described above, the crane 10 is assumed to be in the assembled state unless otherwise specified.

  The crane 10 is a mobile crane, and is mounted on the lower traveling body 12 via the lower traveling body 12, the turning support 14 attached to the lower traveling body 12, and the lower traveling body 12 via the turning support 14. The upper turning body 16 is provided.

  The lower traveling body 12 is a crawler type self-propelled traveling body, and is an example of the lower main body of the present invention. A wheel-type traveling body may be used as the lower traveling body.

  The turning support 14 supports the upper turning body 16 so that the upper turning body 16 can turn with respect to the lower body 12. For example, a swivel bearing is used as the swivel support 14.

  The upper swing body 16 is mounted on the swing support body 14, and includes a swing frame 20 that is a base of the upper swing body 16 and a boom 40 that is mounted on the swing frame 20 so as to be undulated. Although not shown, the upper swing body 16 also includes a counterweight, a cab, an engine, a winch, and the like.

  The turning frame 20 is mounted on the lower traveling body 12 via the turning support body 14 so as to be rotatable with respect to the lower traveling body 12. A counterweight, a driver's cab, an engine, a winch, and the like (not shown) are attached to the turning frame 20. In the following description, the terms “front-rear direction” and “left-right direction” appear. The “front-rear direction” refers to the boom 40 so that the axial direction of the boom 40 is parallel to the horizontal plane when the crane 10 is assembled. Is a direction coinciding with the axial direction of the boom 40 in a state in which it is lying down (see the boom 40 indicated by a solid line in FIG. 1), and the “left-right direction” is orthogonal to the front-rear direction and is a horizontal plane. It is a direction parallel to.

  The turning frame 20 is configured to be disassembled into a plurality of members in the front-rear direction. As shown in FIG. 2, the swivel frame 20 includes a front frame 21, a rear frame 22, a swivel support attachment portion 27, and a pair of attachment brackets 39.

  The front frame 21 constitutes the front portion of the revolving frame 20 and is included in the concept of the main frame of the present invention. The front frame 21 is provided with a turning support attachment portion 27 and a pair of attachment brackets 39. The rear frame 22 constitutes the rear part of the revolving frame 20 and is included in the concept of the subframe of the present invention. The rear frame 22 is disposed behind the front frame 21 and coupled to the front frame 21 in a separable state. Therefore, the revolving frame 20 can be disassembled into the front frame 21 provided with the revolving support attaching part 27 and the attaching bracket 39 and the rear frame 22 in the front-rear direction.

The dimension W _{FF in} the left-right direction of the front frame 21 is larger than the dimension L _{FF in} the front-rear direction of the front frame 21 and larger than the dimension W _{RF in} the left-right direction of the rear frame 22. The front frame 21 and the rear frame 22 are coupled to each other in a state where the horizontal center positions of both the frames 21 and 22 are located on the same straight line. In this state, the both frames 21 and 22 are viewed from above. It arrange | positions so that T shape may be made.

When the crane 10 is transported, the front frame 21 and the rear frame 22 are separated from each other and loaded on a transport vehicle. At this time, the front frame 21 has the left-right direction of the front frame 21 in the assembled state of the crane 10 aligned with the front-rear direction (vehicle length direction) of the transport vehicle, and the front-rear frame 21 in the assembled state of the crane 10. The vehicle is loaded on the transport vehicle in a state where the direction matches the left-right direction (vehicle width direction) of the transport vehicle. The dimension W _{FF in} the left-right direction of the front frame 21 in the assembled state of the crane 10 is larger than the transport limit width when the transport vehicle passes on the public road. Further, the dimension L _FF in the front-rear direction of the front frame 21 in the assembled state of the crane 10, that is, the dimension in the left-right direction of the front frame 21 in the disassembled transport state of the crane 10 is equal to or less than the transport limit width. The size L _FF in the front-rear direction of the front frame 21, it is preferable that the transport restriction width equal to or substantially equal.

Further, during transportation, the rear frame 22 has the left and right direction of the rear frame 22 in the assembled state of the crane 10 coincided with the left and right direction of the transport vehicle, and the front and rear of the rear frame 22 in the assembled state of the crane 10. The vehicle is loaded on the transport vehicle in a state where the direction matches the front-rear direction of the transport vehicle. Lateral dimension W _RF of the rear side frame 22 in the assembled condition of the crane 10 is the transport limited width or less. Incidentally, the left-right dimension W _RF of the rear frame 22 is also preferably equal to or substantially equal to the transport limitations width.

  The front frame 21 includes a front frame main body 21a and a pair of front side coupling brackets 31a.

  The front frame main body 21 a is a part constituting the substantially rectangular frame structure of the front frame 21 and occupies most of the front frame 21. The pair of front coupling brackets 31a is provided in a region overlapping with a front surface 22f of a rear frame main body 22a described later when viewed from the front-rear direction in the front frame main body 21a, and is arranged separately at both left and right ends of the region. Yes. The front coupling bracket 31a is disposed in front of the rear surface 21r of the front frame body 21a. Specifically, the front coupling bracket 31a is disposed so as to extend from the rear surface 21r of the front frame body 21a to the front side and enter the inside of the front frame body 21a. Since the rear surface 21r of the front frame body 21a is a side surface facing the left or right side of the transport vehicle in the disassembled and transported state of the crane 10, the front frame 21 is disposed by the front coupling bracket 31a being arranged in this manner. Is mounted on the transport vehicle, the front coupling bracket 31a does not protrude to the left or right of the front frame body 21a.

  The turning support attaching portion 27 is a portion to which the turning support 14 (see FIG. 1) is attached. The turning support attaching portion 27 is provided at the center of the bottom surface (lower surface) of the front frame body 21a. The turning support attaching part 27 includes a plurality of bolt holes (not shown) provided in a circle along the turning support 14.

  The rear frame 22 has a rear frame body 22a and a pair of rear coupling brackets 31b.

  The rear frame main body 22 a is a part constituting the substantially rectangular frame structure of the rear frame 22 and occupies most of the rear frame 22. A counterweight, winch, etc. (not shown) are mounted on the rear frame body 22a.

  The pair of rear side coupling brackets 31b is a portion that couples with the pair of front side coupling brackets 31a of the front side frame 21, and the rear side frame 22 and the front side frame 21 are joined by coupling the rear side coupling bracket 31b with the front side coupling bracket 31a. Are integrally assembled (coupled). The pair of rear coupling brackets 31b is provided at the front end of the rear frame main body 22a. Specifically, the pair of rear side coupling brackets 31b are attached to the front surface 22f of the rear side frame main body 22a, and are arranged at intervals in the left-right direction. The rear coupling bracket 31b is provided at a position slightly inside from the left and right ends of the front surface 22f of the rear frame body 22a. For this reason, the rear side coupling bracket 31b does not protrude from the rear side frame main body 22a to the left and right sides while the rear side frame 22 is loaded on the transport vehicle.

  Hereinafter, the structure of the front side coupling bracket 31a and the rear side coupling bracket 31b and the coupling structure between the brackets 31a and 31b will be described in detail.

  Each front coupling bracket 31a has two front coupling plates 32f fixed to the front frame body 21a, and a pin P (see FIG. 4A) is inserted into each front coupling plate 32f. A hole 33a is formed. In FIG. 3, only a part of the plurality of holes 33 a is denoted by reference numerals in order to avoid complexity. Each rear coupling bracket 31b is composed of one rear coupling plate 32r fixed to the rear frame body 22a, and each rear coupling plate 32r is formed with a hole 33b into which the pin P is inserted. Has been. The right front coupling bracket 31a of the pair of front coupling brackets 31a is coupled to the right rear coupling bracket 31b, and the left front coupling bracket 31a of the pair of front coupling brackets 31a is the left rear coupling bracket 31b. Combined with.

  Each front coupling bracket 31a and the corresponding rear coupling bracket 31b are coupled as follows. Since the left brackets 31a and 31b are coupled to each other in the same manner as the right brackets 31a and 31b are coupled to each other, the one front coupling bracket 31a and the corresponding one of the rear coupling brackets 31b are hereinafter referred to. A combination form will be described as a representative.

  The rear side coupling plate 32r of the rear side coupling bracket 31b is inserted between the two front side coupling plates 32f constituting the front side coupling bracket 31a. In this state, the holes 33a of the front side coupling plate 32f and the rear side coupling plate 32r A pin P is inserted into the hole 33b. Thereby, the front side coupling bracket 31a and the rear side coupling bracket 31b are coupled to each other.

  Although not shown in FIGS. 2 and 3, the front frame body 21a has a telescopic cylinder S (see FIG. 4 (FIG. 4) for inserting and removing the pin P with respect to the holes 33a and 33b of the coupling plates 32f and 32r. a) to (c)) are attached. The telescopic cylinder S may be attached to the rear frame body 22a. The telescopic cylinder S extends to insert the pin P into the holes 33a and 33b of the coupling plates 32f and 32r (see FIG. 4A), and contracts to retract the pin P into the holes 33a and 33r of the coupling plates 32f and 32r. It is made to detach | leave from 33b (refer FIG.4 (b)). A center line C in FIGS. 4A to 4C is a center line that is located at the center in the left-right direction of the revolving frame 20 and extends in the front-rear direction. Further, the number of the front coupling plate 32f and the rear coupling plate 32r may be changed.

  As shown in FIGS. 4A and 4B, one telescopic cylinder S is provided for one front-side coupling bracket 31a and one rear-side coupling bracket 31b. That is, since the front side coupling bracket 31a and the rear side coupling bracket 31b are provided in two places on the revolving frame 20, two telescopic cylinders S are provided correspondingly. Specifically, the telescopic cylinder S has a position on the left side of the front side coupling bracket 31a on the left side of the front side frame body 21a and on the right side of the left side surface of the front side frame body 21a (position S1 in FIG. 3). The front frame body 21a is disposed on the right side of the right front coupling bracket 31a and on the left side of the right side surface of the front frame body 21a (position S2 in FIG. 3). The telescopic cylinder S is located on the side of the holes 33a and 33b and is arranged so as to be coaxial with the holes 33a and 33b.

  In addition, as shown in FIG.4 (c), one common expansion-contraction cylinder S may be provided with respect to the two front side coupling brackets 31a and the rear side coupling brackets 31b. In this case, the telescopic cylinder S is arranged at a position between the left and right front coupling brackets 31a (position S3 in FIG. 3) in the front frame body 21a, and the center line C in the left-right direction of the revolving frame 20 It is arranged in a state of extending from side to side across the. The telescopic cylinder S is configured to be telescopic on both left and right sides, and pins P are attached to both ends of the telescopic cylinder S, respectively. As the telescopic cylinder S extends to the left and right sides, the pins P on both sides are inserted into the corresponding holes 33a and 33b of the coupling plates 32f and 32r (as shown in FIG. 4 (c)). By contracting inward, the pins P on both sides are detached from the holes 33a and 33b of the corresponding coupling plates 32f and 32r, respectively. According to this configuration, the pin P can be attached to and detached from the left and right brackets with one telescopic cylinder S.

  A force to which the boom 40 (see FIG. 1) tends to fall is transmitted to the rear frame 22 via the wire rope R or the like. Therefore, a rotational force that rotates the rear frame 22 so as to lift upward with respect to the front frame 21 about the pin P acts on the rear frame 22. At this time, the upper end portion of the front surface 22f of the rear frame body 22a is pressed by the upper end portion of the rear surface 21r of the front frame body 21a, thereby preventing the rear frame 22 from rotating about the pin P.

The pair of mounting brackets 39 (see FIG. 2 and FIG. 3) are for mounting the base end of the boom 40 so that the boom 40 can be raised and lowered. The pair of mounting brackets 39 are provided at the front end of the front frame 21 (front frame main body 21a), and are formed integrally with the front frame 21 (front frame main body 21a). The pair of mounting brackets 39 are arranged at the left and right sides at the front end portion of the front frame 21. Specifically, mounting brackets 39 are provided at the left end and the right end of the front end of the front frame 21 (front frame main body 21a), respectively. Each of the left and right mounting brackets 39 includes two mounting plates 39a. Each mounting plate 39a is arranged in a posture along the front-rear direction and the vertical direction of the upper-part turning body 16 (the turning frame 20). Each mounting plate 39a is formed with a hole 39b into which a pin (not shown) is inserted. The hole 39b penetrates the mounting plate 39a in the left-right direction (thickness direction). The two mounting plates 39a of each mounting bracket 39 sandwich a plate portion (not shown) constituting the base end portion 40f of the boom 40 between them. In this state, the boom 40 can be raised and lowered by inserting a pin into a hole 39b of the mounting plate 39a and a hole (not shown) formed in the plate portion of the base end portion 40f (boom foot). Attached to the front frame 21.

  As shown in FIG. 1, the boom 40 is a member for suspending an unillustrated suspended load or the like, and extends linearly in a predetermined direction. The boom 40 is a lattice boom having a lattice structure. The boom 40 can be disassembled into a plurality of members in the axial direction (the direction in which the boom 40 extends). Specifically, the boom 40 includes an upper boom 42, an intermediate boom 44, and a lower boom 50 that are sequentially arranged from the distal end side to the proximal end side, and the upper boom 42 and the intermediate boom 44 can be separated from each other. The intermediate boom 44 and the lower boom 50 are connected to each other so as to be separable from each other. The intermediate boom 44 can be omitted.

The lower boom 50 is a member constituting a specific length range from the base end portion 40 f of the boom 40 to the distal end portion side, and is attached to a pair of mounting brackets 39 provided on the front frame 21. The lower boom 50 has a tapered shape in which the distance between the back surface 50b and the abdominal surface 50v gradually increases from the base end portion 40f toward the distal end side when viewed from the left-right direction (see FIG. 1). The back surface 50b is a surface facing the upper side of the lower boom 50 when the boom 40 is lying down horizontally as shown in FIG. 1, and the abdominal surface 50v is a surface facing the lower side of the lower boom 50 in the same state. Further, the lower boom 50 has a tapered shape in which the dimension in the left-right direction gradually increases from the distal end side toward the proximal end portion 40f side (see FIG. 2). In addition, the taper shape of the lower boom 50 does not necessarily need to be uniformly formed from the base end part to the front-end | tip part of the said lower boom 50, and may be formed to the middle. The dimension in the left-right direction of the base end part (base end part 40 f) of the lower boom 50 is equal to or substantially equal to the dimension W _{FF in} the left-right direction of the front frame 21. The horizontal dimension of the tip of the lower boom 50 is equal to the horizontal dimension W _MB of the intermediate boom 44. The dimension W _{MB in} the left-right direction of the intermediate boom 44 is a dimension equal to or smaller than the transport limit width, and preferably equal to the transport limit width. The intermediate boom 44 and the like may also be formed with a tapered portion that is continuous with the tapered shape of the lower boom 50.

  Further, the lower boom 50 can be disassembled into a plurality of members (two in this embodiment) in the left-right direction (left-right direction when the crane is assembled). Specifically, as shown in FIG. 2, the lower boom 50 includes a right split boom 52 that forms the right side of the lower boom 50 and a left split boom 54 that forms the left side of the lower boom 50. The right split boom 52 and the left split boom 54 are coupled so as to be separable from each other. The right split boom 52 and the left split boom 54 are included in the concept of the split boom of the present invention.

  The right split boom 52 has a right split boom main body 52a and a right boom coupling bracket 56a, and the left split boom 54 has a left split boom main body 54a and a left boom coupling bracket 56b.

  The right split boom main body 52a is formed to have a lattice structure, and occupies most of the right split boom 52. The right split boom main body 52a has a trapezoidal outer shape when viewed from above with the boom 40 lying down. The right side surface of the right split boom main body 52a constitutes the right side surface of the lower boom 50, and is inclined so as to move away from the left side surface of the right split boom main body 52a as it goes toward the base end side of the lower boom 50. The right boom coupling bracket 56a is provided at the upper and lower portions of the front end portion (the end portion on the intermediate boom 44 side) of the left side surface of the right split boom 52 and the rear end portion (the end portion on the front frame 21 side) of the left side surface. Is provided.

  The left split boom body 54a has a left-right symmetrical structure with the right split boom body 52a, and occupies most of the left split boom body 54. The left side surface of the left divided boom body 54a constitutes the left side surface of the lower boom 50, and is inclined so as to move away from the right side surface of the left divided boom body 52a toward the base end side of the lower boom 50. The left boom coupling bracket 56b is provided at the upper and lower portions of the front end portion (the end portion on the intermediate boom 44 side) of the right side surface of the left split boom 52 and the rear end portion (the end portion on the front frame 44 side) of the right side surface. It has been.

  The right boom coupling bracket 56a disposed at the front end of the right split boom body 52a and the left boom coupling bracket 56b disposed at the front end of the left split boom body 54a are pin-coupled to each other, and the rear end of the right split boom body 52a. The right boom boom 52 and the left split boom 54 are connected to each other by pin-bonding the right boom joint bracket 56a disposed at the rear portion and the left boom joint bracket 56b disposed at the rear end of the left split boom body 54a. Are connected to each other. The specific configuration of each right boom coupling bracket 56a and the left boom coupling bracket 56b coupled thereto is the same as that of the front coupling bracket 31a and the rear coupling bracket 31b coupled thereto.

  A connecting bracket 57 is provided at the distal end of the lower boom 50 so as to be detachably coupled to the connecting bracket 45 at the base end of the intermediate boom 44. The connecting brackets 57 are provided at the left and right ends of the tip of the lower boom 50, that is, the left end of the tip of the left split boom main body 54a and the right end of the tip of the right split boom main body 52a. The configuration of each connection bracket 57 of the lower boom 50 and the connection bracket 45 of the intermediate boom 44 coupled thereto is the same as the configuration of the front coupling bracket 31a and the rear coupling bracket 31b coupled thereto.

When the crane 10 is transported, the lower boom 50 is separated from the front frame 21 and the intermediate boom 44 and then disassembled into a right split boom 52 and a left split boom 54. That is, the lower boom 50 is disassembled into a right split boom 52 and a left split boom 54 with the center in the left-right direction as a boundary. The left-right dimension W _RLB of the base end portion, which is the largest dimension in the left-right split boom 52, and the left-right dimension of the base end portion, which is the largest dimension in the left-right split boom 54. The direction dimension W _LLB is a dimension equal to or smaller than the transport limit width, and preferably equal to the transport limit width. When the crane 10 is transported, the right split boom 52 and the left split boom 54 are separated from each other and then loaded on the transport vehicle in a state where their left and right directions coincide with the left and right directions of the transport vehicle.

In the first embodiment, the front frame 21 has a large lateral dimension _WFF , and the distance between the pair of mounting brackets 39 provided on the front frame 21 is large. As a result, the rigidity (lateral rigidity) in the left-right direction near the base end of the boom 40 can be increased. For this reason, the bending (lateral deflection) of the boom 40 in the left-right direction can be suppressed. Further, in the first embodiment, the dimension L _FF in the front-rear direction of the front frame 21, less than lateral dimension W _FF of the front frame 21, since the dimension of the transport limits the width or less, transport of the crane 10 Sometimes, by loading the front frame 21 on the transport vehicle in a state where the front-rear direction of the front frame 21 coincides with the left-right direction of the transport vehicle, the transport width of the front frame 21 can be reduced below the transport limit width of the public road. . Therefore, in the first embodiment, the front frame 21 of the upper swing body 16 can be transported while suppressing the bending of the boom 40 in the left-right direction.

In the first embodiment, since the rear frame 22 is connected to the rear of the front frame 21 in the assembled state of the crane 10, the size of the upper swing body 16 in the front-rear direction can be increased, and the stability of the upper swing body is increased. Can be improved. In addition, since the rear frame 22 is provided, a large installation space for various devices and members mounted on the upper swing body 16 can be secured. For this reason, the layout of various devices and members mounted on the upper swing body 16 can be easily performed. Further, since the rear frame 22 can be separated from the front frame 21, when the crane 10 is transported, if the rear frame 22 is separated from the front frame 21, the front frame 21 is transported in the front-rear direction as described above. The vehicle can be transported in a state where it is loaded on a transport vehicle in a state that matches the left-right direction of the vehicle and the transport width of the front frame 21 is suppressed to a transport limit width or less. Further, lateral dimension W _RF is the rear frame 22, since the following dimensions transportation limit width, the rear frame 22 is left and right directions when loaded on a transport vehicle in a state that matches the lateral direction of the transport vehicle The transport width of the rear frame 22 can also be reduced to a transport limit width or less.

  Further, in the first embodiment, as described above, the left and right dimensions of the base end portion of the lower boom 50 constituting the base end portion 40f of the boom 40 are ensured to suppress the deflection of the boom 40 in the left and right direction. On the other hand, since the dimension in the left-right direction of the lower boom 50 becomes smaller toward the distal end side, the lower boom 50 is uniformly formed up to the distal end part while maintaining the large lateral dimension of the base end part. Compared with the case where it exists, the weight of the lower boom 50 can be reduced. Therefore, in this 1st Embodiment, the increase in the weight of the boom 40 can be suppressed, suppressing the bending to the left-right direction of the boom 40. FIG.

  Further, in the first embodiment, the lower boom 50 is constituted by a right split boom 52 and a left split boom 54 arranged side by side in the left-right direction, and the right split boom 52 and the left split boom 54 are separable from each other. Therefore, even when the horizontal dimension of the base end portion of the lower boom 50 (the base end portion 40f of the boom 40) exceeds the transport limit width, the lower boom 50 is divided into the right split boom when the crane 10 is transported. The transport width of the lower boom 50 can be reduced by dividing into 52 and the left split boom 54, and the transport width of the lower boom 50 can be prevented from exceeding the transport limit width.

  Further, since the lower boom 50 has a horizontal dimension that decreases toward the distal end, the horizontal dimension of the lower boom 50 is a large horizontal dimension at the base end and is constant up to the distal end. In comparison, the weight of the lower boom 50 can be reduced. As a result, an increase in the weight of the boom 40 can be suppressed.

(Modification 1 of the first embodiment)
FIGS. 5A and 5B show a coupling structure of the front frame 21 and the rear frame 22 of the upper swing structure according to the first modification of the first embodiment. With reference to FIG. 5 (a), (b), the difference with the said 1st Embodiment of the upper turning body by this modification 1 is demonstrated.

  In the first modification, the two front coupling plates 32f of each front coupling bracket 31a protrude rearward from the rear surface 21r of the front frame body 21a. In the first modification, the front frame 21 includes a front stopper 36f, and the rear frame 22 includes a rear stopper 36r.

  The front stopper 36f and the rear stopper 36r are members for preventing the rear frame 22 from rotating relative to the front frame 21 around the pin P (see FIG. 5B). As shown in FIG. 5A, the front stopper 36f is attached to the rear surface 21r of the front frame body 21a, and the rear stopper 36r is attached to the front surface 22f of the rear frame body 22a. The front stopper 36f and the rear stopper 36r are adjacent to each other with a gap between them when the crane 10 is in an assembled state, that is, when the front frame 21 and the rear frame 22 are coupled to each other. They are arranged in a state or in contact with each other. The front stopper 36f is fixed to the upper end of the front coupling plate 32f, and the rear stopper 36r is fixed to the upper end of the rear coupling plate 32r. Each stopper 36f, 36r is formed in a rectangular parallelepiped shape, for example.

  The force that the boom 40 (see FIG. 1) tries to fall is transmitted to the rear frame 22 via the wire rope R or the like, and as a result, the rear frame 22 is moved upward with respect to the front frame 21 with the pin P as an axis. When the rotational force that rotates to act on the rear frame 22 is applied to the rear frame 22, as shown in FIG. 5B, the rear stopper 36r is pressed by the front stopper 36f, so that the pin P of the rear frame 22 is pivoted. This rotation is prevented.

  The front stopper 36f may be fixed to the lower end of the front coupling plate 32f, and the rear stopper 36r may be fixed to the lower end of the rear coupling plate 32r.

(Modification 2 of the first embodiment)
With reference to FIG.6 and FIG.7, the difference with said 1st Embodiment is demonstrated about the turning frame 120 of the upper turning body 16 by the modification 2 of 1st Embodiment. 7 is a view taken along arrow VII in FIG. 6, and FIG. 6 is a view taken along arrow VI in FIG.

  Unlike the turning frame 20 according to the first embodiment, the turning frame 120 according to the second modification of the first embodiment can be disassembled into a plurality of members in the vertical direction in the assembled state of the crane.

  Specifically, the turning frame 120 includes an upper frame 121 and a lower frame 123 that is disposed below the upper frame 121 and is detachably coupled to the upper frame 121.

A pair of mounting brackets 39 are provided on the upper frame 121. The upper frame 121 is included in the concept of the main frame of the present invention. The upper frame 121 has the same shape as the front frame 21 (see FIG. 2) of the first embodiment. However, the upper frame 121 is not provided with the turning support attaching portion 27 (see FIG. 6). The left-right dimension W _UF of the upper frame 121 is set in the same manner as the left-right dimension W _FF of the front frame 21 of the first embodiment, and the front-rear dimension L _UF of the upper frame 121 is the same as that of the first embodiment. It is set similarly to the longitudinal dimension L _FF in the form of the front frame 21.

The horizontal dimension W _LF of the lower frame 123 is set similarly to the horizontal dimension W _RF of the rear frame 22 of the first embodiment. The front-rear dimension of the lower frame 123 is larger than the front-rear dimension of the rear frame 22 of the first embodiment. The lower frame 123 is disposed such that its front portion overlaps the lower side of the upper frame 121 and is coupled to the upper frame 121 in this state. The upper frame 121 and the lower frame 123 are arranged so as to form a T shape when viewed from above in a state where they are coupled to each other. At locations corresponding to the four corners of the region where the upper frame 121 and the lower frame 123 overlap, the upper frame 121 is provided with the coupling bracket 31a and the lower frame 123 is provided with the coupling bracket 31b. The upper frame 121 and the lower frame 123 are coupled by the pin coupling of the brackets 31a and 31b. The configurations of the brackets 31a and 31b are the same as the configurations of the brackets 31a and 31b in the first embodiment. The swivel support attaching portion 27 is provided on the bottom surface of the lower frame 123, and more specifically, in the region of the bottom surface that overlaps the upper frame 121 when viewed from above.

(Modification 3 of the first embodiment)
With reference to FIG. 8, the difference with said 1st Embodiment is demonstrated about the boom 140 of the upper turning body 16 by the modification 3 of 1st Embodiment.

  Unlike the lower boom 50 of the boom 40 according to the first embodiment, the lower boom 150 of the boom 140 according to the third modification of the first embodiment can be disassembled into three members in the left-right direction.

  Specifically, the lower boom 150 has a right divided boom 152, a central divided boom 153, and a left divided boom 154, and can be divided into these divided booms 152 to 154 in the left-right direction. The right split boom 152, the central split boom 153, and the left split boom 154 are included in the concept of the split boom of the present invention. In the left-right direction, among the divided booms 152, 153, and 154, the central divided boom 153 is disposed at the center, the right divided boom 152 is disposed on the right side of the central divided boom 153, and the left divided boom 154 is disposed on the left side of the central divided boom 153. Is arranged. The right split boom 152 and the central split boom 153 are coupled in a separable state, and the left split boom 154 and the central split boom 153 are coupled in a separable state.

  The right split boom 152 has a right split boom main body 152a formed so as to form a lattice structure and occupies most of the right split boom 152, and a right boom coupling bracket 56a provided on the right split boom main body 152a. The left split boom 154 includes a left split boom main body 154a that is formed to have a lattice structure and occupies most of the left split boom 154, and a left boom coupling bracket 56b.

  In a state in which the boom 140 is in a lying state, the right split boom main body 152a and the left split boom main body 154a are formed so as to form a triangle when viewed from above, and are arranged so as to be symmetrical with each other in the left-right direction. Yes. That is, the right side surface of the right split boom body 152a is inclined so as to gradually move away from the left side surface of the right split boom body 152a toward the base end side of the lower boom 150, and the left side surface of the left split boom body 154a. Is inclined so as to gradually move away from the right side surface of the left split boom main body 154a toward the base end side of the lower boom 150. Note that the right-side split boom main body 152a and the left-side split boom main body 154a may be formed to have a trapezoidal shape when viewed from above with the boom 140 lying down.

  The right boom coupling bracket 56a is provided at the front end portion and the rear end portion of the left side surface of the right split boom main body 152a. The left boom coupling bracket 56b is provided at the front end portion and the rear end portion of the right side surface of the left split boom main body 154a.

  The central split boom 153 includes a central split boom main body 153a formed so as to form a lattice structure and occupying most of the central split boom 153, and a central boom coupling bracket 153b provided on the central split boom main body 153a. The central split boom main body 153a is formed to have a rectangular outer shape when viewed from above in a state where the boom 140 is lying down. The central boom coupling bracket 153b is provided at the front end portion and the rear end portion of the right side surface of the central split boom main body 153a and the front end portion and the rear end portion of the left side surface of the central split boom main body 153a, respectively.

  The central boom coupling bracket 153b provided on the right side surface of the central divided boom body 153a and the left boom coupling bracket 56a provided on the left side surface of the right divided boom main body 152a are pin-coupled in a separable state. Thereby, the central split boom 153 and the right split boom 152 are integrated. The central boom coupling bracket 153b provided on the left side surface of the central split boom main body 153a and the left boom connection bracket 56b provided on the right side surface of the left split boom main body 154a are pin-coupled in a state where they can be separated from each other. Thus, the central split boom 153 and the left split boom 154 are integrated.

The dimension W _{CLB in} the left-right direction of the central split boom 153 is equal to the dimension W _{MLB in} the left-right direction of the intermediate boom 44 and is equal to or smaller than the transport limit width. The dimension W _CLB is preferably a dimension equal to the transport limit width. When the crane is transported, the central split boom 153 is loaded on the transport vehicle in a state where the left-right direction coincides with the left-right direction of the transport vehicle. In addition, the dimensions in the left-right direction of the right split boom 152 and the left split boom 154 are also less than the transport limit width.

(Other modifications of the first embodiment)
Various modified examples of the first embodiment include various modifications other than the above-described modified examples 1 to 3.

  For example, the turning frame may not be disassembled into a plurality of members in the front-rear direction. That is, the swivel frame includes the front frame, but may not include the rear frame.

  Further, the turning frame may be disassembled into three or more members in the front-rear direction. For example, in addition to being able to disassemble the turning frame into a front frame and a rear frame, at least one of the front frame and the rear frame may be disassembled into a plurality of members in the front-rear direction. .

  In the configuration in which the swivel frame can be disassembled into a plurality of divided frames in the front-rear direction, the divided frame provided with the mounting bracket may not be the divided frame arranged at the foremost side among the plurality of divided frames.

  Moreover, the turning frame may be disassembled into three or more members in the vertical direction. For example, at least one of the upper frame and the lower frame constituting the turning frame may be disassembled into a plurality of members in the vertical direction.

  In the configuration in which the swivel frame can be disassembled into a plurality of divided frames in the vertical direction, the divided frame provided with the mounting bracket does not have to be the uppermost divided frame among the plurality of divided frames. For example, another divided frame may be disposed on the upper frame provided with the mounting bracket.

  Further, the lower boom may be disassembled into four or more members in the left-right direction.

  Moreover, the lower boom may not be disassembled into a plurality of members in the left-right direction.

(Second Embodiment)
Next, with reference to FIG. 9, the upper turning body 16 by 2nd Embodiment of this invention is demonstrated.

  In the upper revolving structure 16 according to the second embodiment, the revolving frame 220 includes a frame body 220a composed of a right frame 223 and a left frame 224 that are coupled in a separable state in the left-right direction. It can be disassembled into a right frame 223 and a left frame 224.

  The frame main body 220a of the revolving frame 220 has a rectangular outer shape when viewed from above. The right frame 223 constitutes a portion from the center in the left-right direction of the frame main body 220a to the right end, and the left frame 224 constitutes a portion from the center in the left-right direction to the left end of the frame main body 220a. That is, the frame body 220a of the turning frame 220 can be disassembled into the right frame 223 and the left frame 224 with the center in the left-right direction as a boundary. The right frame 223 and the left frame 224 are included in the concept of the divided frame of the present invention.

  The right frame 223 includes a right frame body 223a and a right coupling bracket 223b, and the left frame 224 includes a right frame body 224a and a right coupling bracket 224b. The right frame body 223a and the left frame body 224a have an elongated rectangular outer shape when viewed from above, and the right outer frame body 223a and the left frame main body 224a form a rectangular outer shape of the revolving frame 220. .

  The right coupling bracket 223b is provided at the front end portion and the rear end portion of the left end portion of the right frame body 223a, and the left coupling bracket 224b is provided at the front end portion and the rear end portion of the right end portion of the left frame body 223a, respectively. Is provided. The right coupling bracket 223b and the left coupling bracket 224b provided at positions corresponding to each other are pin-coupled in a separable state. The configuration of the right coupling bracket 223b and the left coupling bracket 224b coupled thereto is the same as the configuration of the front coupling bracket 31a and the rear coupling bracket 31b coupled thereto in the first embodiment.

When the crane is transported, the coupling between the right coupling bracket 223b and the left coupling bracket 224b is released, and the turning frame 220 is disassembled into the right frame 223 and the left frame 224. The right frame 223 and the left frame 224 are loaded on the transport vehicle in a state in which the left-right direction thereof coincides with the left-right direction of the transport vehicle. Dimensions W _F in the lateral direction of the rotating frame 220 is greater than the transportation limit width. In addition, the left-right dimension W _{RSF of} the right frame 223 and the left-right dimension W _LSF of the left frame 224 are both dimensions that are equal to or smaller than the transport limit width. In addition, it is preferable that the dimension _{WRSF in} the left-right direction of the right frame 223 and the dimension W _{LSF in} the left-right direction of the left frame 224 are equal to the transport limit width. A swivel support attachment portion 27 is provided at a position closer to the front of the bottom surface of the right frame 223 and the left frame 224. The swivel support attachment portion 27 is divided into two members in the left-right direction, the right member thereof is provided on the bottom surface of the right frame 223, and the left member thereof is provided on the bottom surface of the left frame 224.

  The pair of mounting brackets 39 </ b> R and 39 </ b> L are provided separately on the left and right at the front end portion of the turning frame 220. Specifically, one mounting bracket 39R is provided at the right end of the front end of the revolving frame 220, that is, the right end of the front end of the right frame 223, and the other mounting bracket 39L is provided at the front end of the revolving frame 220. It is provided at the left end, that is, the right end of the front end of the left frame 224. Due to the arrangement of the mounting brackets 39R and 39L, the distance between the mounting brackets 39R and 39L is larger than the transport limit width. The configuration of each mounting bracket 39R, 39L and the base end portion 40f of the boom 40 coupled thereto is the same as the configuration of each mounting bracket 39 and the base end portion 40f of the boom 40 coupled thereto in the first embodiment. . The structure of the boom 40 according to the second embodiment is the same as the structure of the boom 40 according to the first embodiment. Other configurations of the upper swing body 16 and the crane according to the second embodiment are the same as the configurations of the upper swing body 16 and the crane according to the first embodiment.

In the second embodiment, larger dimensions W _F in the lateral direction of the rotating frame 220, the pair provided on the revolving frame 220 mounting bracket 39R, the interval between 39L is large, a pair of mounting brackets 39R , 39L is increased, the horizontal dimension of the lower boom 50 attached to the mounting brackets 39R, 39L can be increased. As a result, the rigidity in the horizontal direction near the base end of the boom 40 can be increased. (Lateral stiffness) can be increased. For this reason, the bending (lateral deflection) of the boom 40 in the left-right direction can be suppressed. Further, in the second embodiment, the turning frame 220 can be disassembled into the right frame 223 and the left frame 224 in the left-right direction, and the left-right dimension _{WRSF of} the right frame 223 and the left-right frame 224 Since the dimension _WLSF is less than or equal to the transport limit width, when the crane is transported, the right frame 223 and the left frame 224 are loaded on the transport vehicle in a state where the left and right directions thereof coincide with the left and right direction of the transport vehicle. The transport width of the right frame 223 and the left frame 224 can be reduced to be less than the transport limit width of the public road. Therefore, in this 2nd Embodiment, transportation of the turning frame 20 of the upper turning body 16 can be implemented, suppressing the bending of the boom 40 in the left-right direction.

  The other effects of the second embodiment are the same as the effects of the first embodiment.

(Modification 1 of 2nd Embodiment)
With reference to FIG.10 and FIG.11, the difference with the said 2nd Embodiment is demonstrated about the turning frame 320 of the upper turning body 16 by the modification 1 of 2nd Embodiment. 11 is a view taken along the line XI in FIG. 10, and FIG. 10 is a view taken along the line X in FIG.

  Unlike the turning frame 220 according to the second embodiment, the turning frame 320 according to the first modification of the second embodiment can be disassembled into a plurality of members in the vertical direction.

  Specifically, as shown in FIG. 10, the revolving frame 320 includes a lower frame 325 disposed below the right frame 223 and the left frame 224 and fixed to the bottom surfaces of the right frame 223 and the left frame 224.

  The lower frame 325 is fixed to the front part of the right frame 223 and the left frame 224 and to the central part in the left-right direction. The lower frame 325 is coupled to the right frame 223 and the left frame 224 in a separable state. Specifically, the coupling brackets 31b are provided at the four corners at the upper end of the lower frame 325, respectively, and the coupling brackets 31a are provided at each of the right frame 223 and the left frame 224 corresponding to the four corners of the lower frame 325. The right and left frames 223 and 224 are coupled to the lower frame 325 by pin coupling the corresponding coupling brackets 31a and 31b.

  A swivel support attachment portion 27 is provided on the bottom surface of the lower frame 325. The turning support attaching portion 27 is provided only on the lower frame 325 and is not divided into a plurality of members as in the second embodiment. With this configuration, the turning support 14 (see FIG. 11) can be reliably attached to the turning support attaching portion 27. Further, the turning support 14 can be transported in a state of being attached to the turning support attaching portion 27.

(Modification 2 of the second embodiment)
With reference to FIG. 12, the difference with the said 2nd Embodiment is demonstrated about the turning frame 420 of the modification 2 of 2nd Embodiment.

  The turning frame 420 according to the second modification of the second embodiment can be disassembled into three members in the left-right direction.

  Specifically, the turning frame 420 includes a central frame 426, a right frame 223, and a left frame 224, and can be disassembled into these three frames in the left-right direction. The center frame 426 is included in the concept of the center split frame of the present invention, the right frame 223 is included in the concept of the right split frame of the present invention, and the left frame 224 is the left split of the present invention. It is included in the concept of a frame.

  The center frame 426 is disposed at the center of the turning frame 420 in the left-right direction. The central frame 426 includes a central frame main body 426a that constitutes a substantially rectangular frame structure of the central frame 426, and a central coupling bracket 426b provided on the central frame main body 426a.

  The central frame body 426 is formed to have a rectangular outer shape when viewed from above. A swivel support attachment portion 27 is provided on the bottom surface of the central frame main body 426a. The turning support attaching portion 27 is provided only in the central frame main body 426a, and is not provided by being divided into the right frame 223 and the left frame 224. The central frame 426 is mounted on the lower traveling body 12 (see FIG. 1) so as to be turnable via the turning support 14. The center coupling bracket 426b is provided at the front end portion and the rear end portion of the right side surface of the central frame body 426 and the front end portion and the rear end portion of the left side surface of the center frame body 426, respectively.

  The right frame 223 is disposed on the right side of the central frame 426 and is detachably coupled to the right end of the central frame 426. The right frame 223 has an elongated rectangular outer shape when viewed from above, and includes a right frame body 223a constituting the frame structure of the right frame 223 and a right coupling bracket 223b provided on the right frame body 223a. The right coupling bracket 223b is provided at the front end portion and the rear end portion of the left side surface of the right frame body 223a, respectively. Each right coupling bracket 223b is pin-coupled so as to be separable from the corresponding central coupling bracket 426b, whereby the right frame 223 and the central frame 426 are integrated.

  The left frame 224 is disposed on the left side of the center frame 426 and is detachably coupled to the left end of the center frame 426. The left frame 224 is formed symmetrically with the right frame 223, and includes a left frame body 224a and a left coupling bracket 224b. The left coupling bracket 224b is provided at the front end portion and the rear end portion of the right side surface of the left frame body 224a, respectively. Each left side coupling bracket 224b is pin-coupled in a separable state with respect to the corresponding central coupling bracket 426b, whereby the left side frame 224 and the central frame 426 are integrated.

The center frame 426, the right frame 223, and the left frame 224 constitute a frame body 420a of the turning frame 420. Lateral dimension W _F of the frame body _420a, i.e. the dimension W _F in the lateral direction of the rotating frame 420 is larger than the transport limit width. The right mounting bracket 39R is provided at the right end of the front end of the frame body 420a, that is, the right end of the front end of the right frame 223. The left mounting bracket 39L is provided at the left end of the front end of the frame body 420a, that is, the left end of the front end of the left frame 224. The interval between the mounting brackets 39R and 39L is larger than the transport limit width.

Dimensions W _CF in the left-right direction of the central frame 426 is dimensioned transport limitations width or less, preferably equal or approximately equal size and transportation restrictions width. Further, the right and left dimensions of the right frame 223 and the left and right dimensions of the left frame 224 are dimensions that are equal to or smaller than the transport limit width. When the crane is transported, the turning frame 420 is disassembled into a center frame 426, a right frame 223, and a left frame 224. Thereafter, the center frame 426, the right frame 223, and the left frame 224 are arranged in the left and right directions of the transport vehicle. It is loaded onto the transport vehicle in a state that matches the direction.

  Also in the second modification of the second embodiment, the swivel frame 420 whose lateral dimension is larger than the transport limit width is divided into a center frame 426, a right frame 223, and a left frame 224 having lateral dimensions that are less than the transport limit width. Therefore, the turning frame 420 can be transported through a public road by a transport vehicle.

  In the second modification, the frame main body 420a of the turning frame 420 can be constituted by the central frame 426, the left frame 224 and the right frame 223 arranged on the left and right sides thereof, and thus the structure of the turning frame 420 in the left and right direction. The balance between top and strength can be improved.

(Other modifications of the second embodiment)
Various modified examples of the second embodiment include various modifications other than the above-described modified examples 1 and 2.

  For example, the turning frame may be disassembled into four or more members in the left-right direction. Specifically, the revolving frame can be disassembled into a right frame and a left frame, and the divided frames that make up the revolving frame can be separated on the right side of the right frame and the left side of the left frame. It may be combined with.

  Moreover, the turning frame that can be disassembled into a plurality of members in the left-right direction may be further disassembled into a plurality of members in the front-rear direction.

  Further, the configuration of the first embodiment may be combined with the configuration of the second embodiment. That is, at least one of the right frame and the left frame may be formed such that the dimension in the front-rear direction is smaller than the dimension in the left-right direction. May be transported by being loaded on a transport vehicle in a state corresponding to the above.

  In addition, it should be thought that embodiment and the modification which were disclosed this time are illustrations and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the first modification of the first embodiment, the configuration of the front stopper and the rear stopper for preventing the relative rotation of the rear frame with respect to the front frame has been described. However, the following modifications are made to these stoppers. An example is given.

  FIGS. 13A and 13B show the configuration of the front stopper 536f and the rear stopper 536r according to this modification. A front stopper 536f and a rear stopper 536r according to this modification will be described with reference to FIGS. 13 (a) and 13 (b).

  As shown in FIG. 13A, the front stopper 536f according to the modified example is disposed below the front coupling plate 32f, and is fixed to the rear surface 21r of the front frame 21 and is fixed to the lower end of the front coupling plate 32f. ing. Further, the rear stopper 536r according to the modification is disposed below the rear coupling plate 32r, and is fixed to the front surface 22f of the rear frame 22 and is fixed to the lower end of the rear coupling plate 32r.

  The front stopper 536f and the rear stopper 536r prevent the rear frame 22 from rotating with respect to the front frame 21 about the pin P (see FIG. 13B) in the direction in which the rear end thereof is lowered. Specifically, as shown in FIG. 13B, the rear side stopper 536r is pressed by the front side stopper 536f, thereby preventing the rear frame 22 from rotating. In this modification, in addition to the front stopper 536f below the front coupling plate 32f, a front stopper 36f above the front coupling plate 32f is also provided, and at the rear stopper 536r below the rear coupling plate 32r. In addition, a rear stopper 36r above the rear coupling plate 32r is also provided. For this reason, it is possible to prevent the rear frame 22 from rotating both vertically.

  14A and 14B show a front coupling bracket and a front stopper, a rear coupling bracket and a rear stopper according to still another modification. With reference to FIGS. 14A and 14B, the front and rear coupling brackets and the front and rear stoppers according to the modification will be described.

  In this modification, a front coupling plate 632f of another front coupling bracket 631a is fixed to the rear surface 21r of the front frame 21 in addition to the front coupling plate 32f of the front coupling bracket 31a. In addition to the rear coupling plate 32r of the side coupling bracket 31b, a rear coupling plate 632r of another rear coupling bracket 631b is fixed. The front side coupling bracket 631a is disposed below the front side coupling bracket 31a, and the rear side coupling bracket 631b is disposed below the rear side coupling bracket 31b. That is, the front coupling plate 632f is disposed below the front coupling plate 32f, and the rear coupling plate 632r is disposed below the rear coupling plate 32r. The front side coupling plate 632f has a structure that is vertically symmetrical with the front side coupling plate 32f, and has a hole 633a into which the pin P2 is inserted. The rear coupling plate 632r has a structure that is vertically symmetrical with the rear coupling plate 32r, and has a hole 633b into which the pin P2 is inserted.

  As shown in FIG. 14B, the pin P1 is inserted into the hole 33a of the front coupling plate 32f and the hole 33b of the rear coupling plate 32r, and the holes 633a and the rear coupling plate 632r of the front coupling plate 632f are inserted. The pin P2 is inserted into the hole 633b. As a result, the front frame 21 and the rear frame 22 are coupled in a state in which they cannot rotate.

  In addition to the front stopper 36f fixed to the upper end of the upper front coupling plate 32f, a front stopper 636f fixed to the lower end of the lower front coupling plate 632f is attached to the rear surface 21r of the front frame 21. Yes. Further, on the front surface 22f of the rear frame 22, in addition to the rear stopper 36r fixed to the upper end of the upper rear coupling plate 32r, the rear stopper fixed to the lower end of the lower rear coupling plate 632r. 636r is attached.

  You may combine various 1st Embodiment, 2nd Embodiment, and those modifications mentioned above.

  For example, you may attach the boom 140 of the modification 3 of 1st Embodiment to the turning frame 220 (refer FIG. 9) of 2nd Embodiment.

  Moreover, you may attach the boom 140 of the modification 3 of 1st Embodiment to the turning frame 420 (refer FIG. 12) of the modification 2 of 2nd Embodiment. The configuration of the upper swing body 16 according to this modification is shown in FIG. In the upper turning body 16 of this modification, the rigidity of the lower boom 150 in the left-right direction is increased, and the rigidity of the entire turning frame 420 is also extremely increased. Therefore, the upper turning body 16 is adopted for a very large crane having a large suspension capacity.

  When the upper swing body 16 is in a standard specification state, the swing frame 420 does not necessarily include the right frame 223 and the left frame 224, and the lower boom 150 does not necessarily include the right split boom 152 and the left split boom 154. There is no need to be. That is, in the standard upper swing body 16, the swing frame 420 may include only the center frame 426, and the lower boom 150 may include only the center split boom 153. If the hanging work is performed in the state of the standard specification and the deflection in the left-right direction of the boom 40 can be suppressed to an allowable value or less, the hanging work may be performed in the state of the standard specification.

  In the standard specification, when the horizontal wind is strong, the boom 40 is long, or the suspension load is large, the right and left deflections of the boom 40 may exceed the allowable value. The split boom 152 and the left split boom 154 may be attached to the central split boom 153 to reinforce the boom 40 (lower boom 150), and the right frame 223 and the left frame 224 may be attached to the central frame 426 to reinforce the revolving frame 420. . That is, the right split boom 152 and the left split boom 154, and the right frame 223 and the left frame 224 may be optional reinforcing members that select whether or not to be attached according to various conditions.

  Further, a further modification of the modification shown in FIG. 15 is shown in FIG. In the upper swing body 16 according to this modification, the structures of the right frame 323 and the left frame 324 constituting the frame body 520a of the swing frame 520 are different from the modification shown in FIG. Specifically, the right frame 323 and the left frame 324 each have a triangular outer shape when viewed from above, and are formed so as to be symmetrical with each other. That is, the right side surface of the right frame 323 (right frame body 323a) is inclined so as to gradually approach the left side surface of the right frame 323 (right frame body 323a) toward the rear, and the left frame 324 (left frame) The left side surface of the main body 324a is inclined so as to gradually approach the right side surface of the left frame 324 (left frame main body 324a) as it goes rearward. The frame body 520a of the revolving frame 520 is formed by the right frame 323, the left frame 324, and the center frame 426. The horizontal dimension of the front end portion of the frame body 520a is larger than the transport limit width. .

  In this modification, by attaching the right frame 323 and the left frame 324 to the central frame 426, the frame main body required for enlarging the horizontal dimension of the base end portion 40f of the boom 140 (lower boom 150). It is possible to suppress an increase in the weight of the swivel frame 520 by reducing the horizontal dimension of the rear part of the frame body 520a while ensuring the large horizontal dimension of the front part of the 520a.

10 Crane 20, 120, 220, 320, 420, 520 Turning frame 21 Front frame (main frame)
22 Rear frame (subframe)
39, 39R, 39L Mounting bracket 40, 140 Boom 40f Base end 50, 150 Lower boom 52, 152 Right split boom (lower split boom)
54, 154 Left split boom (lower split boom)
121 Upper frame (main frame)
153 Center split boom (lower split boom)
220a, 420a, 520a Frame body 223, 323 Right frame (divided frame)
224, 324 Left frame (split frame)
426 Center frame (split frame)

Claims (8)

An upper swing body mounted on a lower traveling body of a mobile crane,
A turning frame mounted on the lower traveling body so as to be turnable;
A boom provided so as to be freely raised and lowered on the revolving frame,
The swivel frame includes a pair of mounting brackets to which a base end portion of the boom is attached so that the boom can be raised and lowered, and a frame in which the pair of mounting brackets are provided at intervals in the left-right direction of the upper swing body A main body,
The frame main body includes a plurality of divided frames arranged in the left-right direction of the upper swing body, and adjacent divided frames of the plurality of divided frames are coupled in a state where they can be separated from each other. , The upper swing body of the mobile crane.   The plurality of divided frames include a central divided frame that is attached so as to be rotatable on the lower traveling body, and a state that is arranged on the right side of the central divided frame and is separable into a right end portion of the central divided frame 2. The movement according to claim 1, further comprising: a right divided frame coupled at a left side and a left divided frame disposed on the left side of the central divided frame and coupled in a separable state to the left end of the central divided frame. The upper swing body of the crane. The left side surface of the left split frame is inclined so as to approach the right side surface of the left split frame as it goes rearward.
The upper turning body of the mobile crane according to claim 2, wherein the right side surface of the right divided frame is inclined so as to approach the left side surface of the right frame as it goes rearward. The mobile crane has a turning support attached to the lower traveling body, and supports the upper turning body so that the upper turning body can turn freely with respect to the lower traveling body. The upper revolving unit is mounted so as to be turnable on the lower traveling unit via the revolving support.
The plurality of divided frames include a left frame and a right frame that are arranged so as to be lined up in the left-right direction of the upper swing body and coupled in a separable state,
The swivel frame is disposed below the left frame and the right frame so as to straddle the left frame and the right frame, and is coupled to the left frame and the right frame in a separable state. The upper swing body of the mobile crane according to claim 1, further comprising a swing support mounting portion that is a portion to which the swing support body is mounted and is provided on the lower frame. The boom is attached to the pair of mounting brackets, and has a lower boom constituting a range of a specific length from the base end portion to the tip end side of the boom,
The dimension of the said lower boom in the said left-right direction is an upper turning body of the mobile crane of any one of Claims 1-4 which becomes large as it goes to the base end part side of the said lower boom.   The lower boom includes a plurality of divided booms arranged side by side in the left-right direction, and adjacent divided booms of the plurality of divided booms are coupled in a separable state. The upper swing body of the described mobile crane.   The plurality of split booms include a central split boom, a left split boom disposed on the left side of the central split boom and coupled to the central split boom in a separable state, and on the right side of the central split boom. 7. The upper swing body of the mobile crane according to claim 6, further comprising a right split boom arranged and separably coupled to the central split boom. The left side surface of the left split boom is tilted away from the right side surface of the left split boom as it goes toward the base end side of the lower boom.
8. The upper swing body of the mobile crane according to claim 7, wherein a right side surface of the right split boom is inclined so as to move away from a left side surface of the right split boom toward a base end side of the lower boom.

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