JP2005307560A - Weight of revolving working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weight of a revolving working machine, controlling the weight of a revolving frame side according to the weight of a working apparatus fitted to the front of the revolving frame. <P>SOLUTION: A counterweight 60 disposed in the rear part of the revolving frame 12 is provided with an additional weight 70 mounted through a temporary stopping means 71 for temporarily stopping the additional weight 70 and a mounting means 72 removably fixing the additional weight 70 temporarily stopped by the temporary stopping means 71 to the counterweight 60. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a turning work machine such as a backhoe, and more specifically to a weight.

Conventionally, a swivel working machine such as a backhoe is composed of a lower traveling device and an upper revolving body, and the revolving body is supported on the traveling device so as to be able to turn left and right around a vertical swivel axis. It has a swivel base and a working device (excavation device) provided at the front of the swivel base.
The rear part of the swivel base is provided with an engine room that accommodates the engine and its auxiliary equipment. The engine room includes a swivel board that forms the bottom of the swivel base, and a bonnet that covers the rear part of the swivel base from above. And a counterweight for forming a rear outer surface of the swivel together with the bonnet to balance the weight with the working device.

In this type of swivel work machine, it is proposed that the work device at the front of the swivel base can be replaced depending on the application, but instead of a work device provided as a standard, a long arm or the work device is used. However, if another heavy attachment or the like is attached to the front of the swivel, the center of gravity of the entire swivel work machine will move forward. The weight balance cannot be maintained, and there is a problem that the posture of the swing working machine becomes unstable during excavation work.
Therefore, for example, Patent Document 1 proposes a swivel work machine in which a plurality of weight mounting members each including a support portion of an engine that also serves as a subweight and a support portion of a mounting frame are mounted and arranged in the engine room. .
JP 2001-90119 A

However, in the swing working machine of the above-mentioned Patent Document 1, each weight mounting member constitutes a supporting portion of another member in the engine room, and therefore each weight mounting member cannot be removed from the engine room. . For this reason, even when the working device attached to the front part of the swivel base is replaced with another attachment or the like, there is a problem that the weight on the swivel base side cannot be adjusted by attaching / detaching each weight attachment member.
In view of the above problems, an object of the present invention is to provide a weight of a swivel work machine capable of adjusting the weight on the swivel base side according to the weight of the work device attached to the front part of the swivel base. Is.

The technical means of the present invention for solving this technical problem includes a temporary fixing means 71 for temporarily fixing an additional weight 70 to a counterweight 60 disposed at the rear of the swivel base 12, and the temporary fixing means 71. The additional weight 70 is attached via attachment means 72 for removably fixing the additional weight 70 temporarily fixed by the attachment to the counterweight 60.
According to another technical means of the present invention, the temporary fixing means 71 is fitted on the outer surface of the counterweight 60 so as to protrude from the fitting hole 73 opened in the rearwardly opened manner and the front surface of the additional weight 70. A protrusion 74 inserted into the joint hole 73 and a retaining member 75 that prevents the protrusion 74 inserted through the fitting hole 73 from being inserted into the fitting hole 73 from the upper surface of the counterweight 60. It is the point which has.

  Further, the technical means of the present invention is that the front surface of the additional weight 70 is formed in a concave curved shape substantially along the outer surface of the counterweight 60.

  According to the present invention, the additional weight can be attached to and detached from the counterweight via the temporary fixing means and the mounting means, so that the weight on the swivel base side according to the weight of the work device attached to the front part of the swivel base. Can be adjusted.

Hereinafter, embodiments of the present invention implemented on a backhoe will be described with reference to FIGS.
In FIG. 4, reference numeral 1 denotes a backhoe exemplified as a turning work machine. The backhoe 1 includes a lower traveling device 2 and an upper turning body 3.
The traveling device 2 includes a pair of left and right traveling bodies 4 each having a rubber cover, and a crawler traveling device in which both traveling bodies 4 are driven by a traveling motor M is employed. Further, a dozer 5 is provided at the front portion of the traveling device 2.
The swivel body 3 includes a swivel base 12 that is supported on the travel device 2 via a swivel bearing 11 so as to be turnable left and right around a swivel axis X in the vertical direction, and a working device ( Excavator 13).

  The work device 13 is detachably attached to the swivel base 12 via a support bracket 16 shown in FIG. 5 provided at the front part of the swivel base 12 so as to be offset to the right from the center in the left-right direction. As shown in FIG. 4, the swing bracket 17 is supported by the support bracket 16 so as to be swingable left and right around the vertical axis, and the base side of the swing bracket 17 is pivoted about the horizontal axis. A boom 18 that is attached and supported so as to be swingable up and down, an arm 19 that is pivotally attached to the tip end side of the boom 18 so as to be pivotable around a horizontal axis, and is supported so as to be swingable back and forth; A bucket 20 is provided on the tip side of the arm 19 so as to be able to perform a squeeze / dump operation.

  The swing bracket 17 is swung by expansion and contraction of a swing cylinder (not shown) provided in the swivel base 12, and the boom 18 is expanded and contracted by the boom cylinder 22 interposed between the boom 18 and the swing bracket 17. The arm 19 is swung by the expansion and contraction of the arm cylinder 23 interposed between the arm 19 and the boom 18, and the bucket 20 is interposed between the bucket 20 and the arm 19. Squeezing and dumping operations are performed by the expansion and contraction of the bucket cylinder 24. These swing cylinder, boom cylinder 22, arm cylinder 23, and bucket cylinder 24 are constituted by hydraulic cylinders (hydraulic equipment).

The arm 19 is provided with a hydraulic pressure take-out portion (not shown) for operating a hydraulic attachment attached instead of the bucket 20.
As shown in FIG. 5, the swivel base 12 is formed with a thick plate-like swivel board 25, and the support bracket 16 is projected in front of the swivel board 25. The step surface 26 provided in the front part is expanded in the front-rear direction, and the comfort and maneuverability are ensured by the expansion of the boarding / alighting space.
A driver's seat 27 is provided on the step surface 26 at the front of the swivel base 25 on the left side of the turning axis X, and a pair of control boxes 28 provided on both the left and right sides of the driver's seat 27. A driving control device 30 is configured by a pair of control levers 29 and the like provided in front of the driver's seat 27.

Behind the driver's seat 27, an engine 31 is disposed horizontally on the turning board 25, and a hydraulic pump 32 driven by the engine 31 is disposed on the left side of the engine 31. The radiator 33 is arranged in front of the radiator fan 33a.
Further, a fuel tank 34 is disposed on the swivel board 25 below the driver's seat 27 and the step surface 26, and an oil cooler 35 and a battery 36 are disposed on the right side of the radiator 33. A hydraulic oil tank 37 and a valve unit 38 are provided in front of each other, thereby ensuring a weight balance in the left-right direction of the swivel base 12.

Further, the swivel base 12 is provided with a support frame 40 that straddles the engine 31 and the like in the left-right direction. The support frame 40 has both ends connected to the upper ends of a pair of left and right legs 40L, 40R. The lower end of each leg part 40L, 40R is attached and fixed to the turning board 25 or the like.
The engine 31, hydraulic pump 32, radiator 33, fuel tank 34, oil cooler 35, hydraulic oil tank 37, valve unit 38, and the like include a bonnet 50 that covers the upper side of the turning board 25 from the right side to the rear side from above. The counter board 60 is arranged from the right rear part to the left rear part of the swivel board 25 to constitute the rear part of the swivel base 12 and adjusts the weight balance with the working device 13, thereby covering the swivel board 25. The engine 31, hydraulic pump 32, radiator 33, fuel tank 34, oil cooler 35, hydraulic oil tank 37, valve unit 38, etc. fail when the backhoe 1 travels (forwards or reverses) or turns. It protects against collision or contact with objects (walls, planting, etc.) and makes noise in the engine 31 etc. There prevented from being dissipated to the outside, it is the hot air environment together steering operation device is prevented from being deteriorated.

  The bonnet 50 is formed by sheet metal processing, resin molding (hard plastic molding or reinforced plastic molding is desirable), and is fixed on the horizontal member 41 of the support frame 40 and above the engine 31 and the hydraulic pump 32. A fixed bonnet 51 covering the rear, a rear bonnet 52 covering the engine 31 and the hydraulic pump 32 from the rear upper side on the rear edge side of the fixed bonnet 51, the radiator 33, the oil cooler 35, and the battery located to the right of the fixed bonnet 51. 36, a side bonnet 53 that covers the hydraulic oil tank 37 and the valve unit 38. The bonnet 50 forms an engine room in cooperation with a flat plate-like engine partition member 42 erected in the left-right direction at the center of the turning board 25.

As shown in FIG. 4, the bonnet 50 has ribs 54 formed at intervals in the vertical direction, thereby reinforcing the bonnet 50 and improving the appearance design.
Further, for example, the front side of the side bonnet 53 is pivotally supported so as to be rotatable in the front-rear direction. By opening the side bonnet 53, the radiator 33, the oil cooler 35, the battery 36, the hydraulic oil tank 37, and the valve It is possible to inspect and maintain the unit 38 and the like. The side bonnet 53 may be detachably attached to the swivel base 12 and may be pivotally supported so that the rear part of the side bonnet 53 can be rotated in the front-rear direction.

Further, the front bonnet 52 of the rear bonnet 52 is supported by the horizontal member 41 of the support frame 40 so as to be rotatable about a horizontal axis, and can be opened and closed in the vertical direction as indicated by arrows in FIG. As shown in FIG. 2, the rear bonnet 52 and the counterweight 60 can be unlocked by a locking means 90 provided on the upper side of the center of the rear bonnet 52 in the left-right direction.
As shown in FIG. 3, the locking means 90 includes a lock piece 91 provided on the rear bonnet 52 and a locked piece 92 attached to the upper end of the counterweight 60 in the center in the left-right direction. The lock piece 91 is pivotally supported around an axis Y that is perpendicular or substantially perpendicular to the axial center in the left-right direction of the rear bonnet 52, and a lock that switches between a fixed state and a rotatable state of the lock piece 91. A mechanism 93 is provided on the axis Y.

A key (engine key or the like) is projected into a key hole of the lock mechanism 93 protruding from the outer surface of the rear bonnet 52 and the lock piece 91 is rotated together with the key, whereby the lock piece 91 is engaged with the locked piece 92. When the rear bonnet 52 is opened as shown by a two-dot chain line in FIG. 4 in a state where the lock is released, inspection and maintenance in the vicinity of the upper portion of the engine 31 can be performed.
Further, an elastic rim body such as an elastic tube or an elastic U-shaped tube is attached to both side edges and the rear edge of the rear bonnet 52 which are opposed to the edge of the counterweight 60 by closing the rear bonnet 52. As a result, a seal is applied to the joint (butt gap) between the rear bonnet 52 and the counterweight 60 in the closed state.

  The counterweight 60 provided at the rear part of the swivel board 25 is made of a casting made of a metal such as steel or lead, and is substantially U-shaped in plan view so as to constitute the rear part of the swivel base 12 as shown in FIG. As shown in FIG. 1 or FIG. 2, the entire outer shape is formed in an outward curve. On the outer surface of the counterweight 60, mounting portions 61 having through holes penetrating from the outer surface to the front surface are recessed one by one on the left and right, and a pair of fixing tools 62 made of bolts are attached to the pair of mounting portions. The counterweight 60 is attached to the swivel board 25 by being fastened to a pair of weight mounting members 44 erected on the rear part of the swivel board 25 in a state of being inserted through the through holes 61.

An additional weight 70 for increasing the weight on the swivel base 12 side is detachably attached to the outer surface of the counterweight 60 from the rear side of the counterweight 60. Similar to the counterweight 60, the additional weight 70 is made of a casting made of a metal such as steel or lead. The front surface of the additional weight 70 is formed in a concave curved shape substantially along the outer surface of the counterweight 60, and the outer surface is curved outward. It is formed in a shape.
Thereby, as shown in FIG. 3, the additional weight 70 can be attached in close contact with the outer surface of the counterweight 60, and the attachment state of the additional weight 70 can be stabilized. Further, even when the additional weight 70 is attached to the outer surface of the counterweight 60, the rotational radius of the rear end of the revolving unit 3 is only slightly increased. Therefore, even when the revolving unit 3 is swung in this state, The additional weight 70 does not protrude greatly from both side edges of the traveling body 4, and the additional weight 70 does not hinder the swinging motion of the revolving body 3.

Further, a concave flat portion 60a is formed at the center portion on the upper surface of the counterweight 60, and a flat portion 70a connected to the flat portion 60a is also formed on the upper surface of the additional weight 70. Thus, when the rear bonnet 52 is opened, it is possible to easily insert a hand into the handle portion 52a formed at the lower portion of the locking means 90 provided on the rear bonnet 52, and to open and close the rear bonnet 52. The operation can be performed smoothly without being interrupted by the counterweight 60 and the additional weight 70.
Here, as shown in FIGS. 1 to 3, the additional weight 70 includes a temporary fixing means 71 for temporarily fixing the additional weight 70 to the outer surface of the counterweight 60, and the additional weight temporarily fixed by the temporary fixing means 71. It is attached to the outer surface of the counterweight 60 via mounting means 72 for removably fixing the weight 70 to the outer surface.

As shown in FIG. 1, the temporary fixing means 71 protrudes from a fitting hole 73 that is opened rearward in the left and right central portion of the outer surface of the counterweight 60 and in the left and right central portion of the front surface of the additional weight 70. And a protrusion 74 inserted into the fitting hole 73 and a locking pin 75 (a retaining member) for locking the protrusion 74 inserted into the fitting hole 73, and an additional weight 70. And a pair of left and right fitting portions 76 that are provided on both sides of the front surface of the counterweight 60 and are fitted into the pair of left and right mounting portions 61 of the counterweight 60.
The fitting hole 73 opened in the counterweight 60 is formed in a bottomed cylindrical shape as shown in FIGS. 1 and 2, and the counterweight 60 has the fitting hole 73 from the flat portion 60a to the fitting hole 73. A first through hole 77 is formed through the inner peripheral wall of the first through hole 77 in parallel or substantially in parallel with the axis X. As shown in FIG. 3, the first through hole 77 has a first through part 78 on the upper surface side of the counterweight 60 and a fitting hole 73 having a slightly smaller opening cross section than the first through part 78. The second through-hole 79 on the peripheral wall side is included, and the first through-hole 78 and the second through-hole 79 are connected via a tapered surface 80.

Further, the protruding portion 74 protruding from the additional weight 70 is formed in a bottomed conical shape that can be inserted into the fitting hole 73 with a slight gap between the protruding portion 74 and the inner peripheral wall of the fitting hole 73. A second through hole 81 is formed on the outer peripheral surface at a position facing the first through hole 77 in a state where the first through hole 77 is inserted into the fitting hole 73. It is formed through.
The locking pin 75 extends from the lower part of the head 82 to be accommodated in the first through part 78 of the first through hole 77, the second through part 79 and the second second part of the first through hole 77. A leg portion 83 to be accommodated in the through hole 81 is formed, and a female screw portion 84 is recessed in the head portion 81 from the central portion of the upper end surface toward the inside.

1 and 2, the mounting means 72 includes a pair of fixing tools 85 made of bolts and a pair of insertion holes formed on the left and right sides of the additional weight 70 through which the pair of fixing tools 85 are inserted. 86 and a pair of mounting holes 87 formed at positions facing the pair of insertion holes 86 on the outer surface of the counterweight 60.
In the embodiment of the present invention, when attaching the additional weight 70 to the outer surface of the counterweight 60, first, the locking means 90 shown in FIG. The opening surface of the first through hole 77 of 60a is exposed in a plan view. Next, as shown in FIG. 2, the front surface of the additional weight 70 is opposed to the outer surface of the counterweight 60, and the protrusion 74 on the front surface of the additional weight 70 is inserted into the fitting hole 73 on the outer surface of the counterweight 60. At this time, by inserting the pair of fitting portions 76 on the front surface of the additional weight 70 into the pair of mounting portions 61 on the outer surface of the counterweight 60, the additional weight 70 is fitted to the outer surface of the counterweight 60 without shaking up and down and left and right. It will be.

At this time, the second through hole 81 of the protrusion 74 of the additional weight 70 inserted into the fitting hole 73 of the counterweight 60 is opposed to the first through hole 77 of the fitting hole 73. The locking pin 75 is inserted from the flat portion 60 a of the counterweight 60 toward the first through hole 77 and the second through hole 81. As a result, the protrusion 74 in the fitting hole 73 is prevented from coming off, and the additional weight 70 is temporarily fixed to the counterweight 60.
Here, as shown in FIG. 3, the locking pin 75 is accommodated in a state in which the head 82 is immersed in the first through portion 78 of the first through hole 77, so that the locking pin 75 is accommodated in the rear bonnet. The opening / closing operation of 52 is not hindered.

Then, as shown in FIG. 2, after the rear bonnet 52 is set in a closed state, a pair of fixing tools 85 are inserted from the outer surface of the additional weight 70 toward the pair of insertion holes 86 of the additional weight 70, respectively. By fixing the fixing tool 85 to the pair of mounting holes 62 of the counterweight 60, the additional weight 70 is fixed to the outer surface of the counterweight 60.
On the other hand, when removing the additional weight 70 from the outer surface of the counterweight 60, first, the pair of fixing tools 85 are respectively removed from the pair of mounting holes 62 of the counterweight 60, and the fixed state of the additional weight 70 is released.

Next, the locking means is released, the rear bonnet 52 is set in an open state, and the male screw portion 88a of the rod-shaped connector 88 having the male screw portion 88a formed at the tip portion is connected to the female screw portion of the locking pin 75. Then, the connecting tool 88 is connected to the locking pin 75. As a result, the locking pin 75 can be pulled out, and by pulling out the locking pin 75, the protrusion 74 in the fitting hole 73 is prevented from coming off, and the additional weight 70 is temporarily stopped.
Then, after the rear bonnet 52 is set in the closed state, the additional weight 70 is pulled out toward the rear of the revolving structure 3, so that the protrusion 74 and the pair of fitting portions 76 of the additional weight 70 are formed on the outer surface of the counterweight 60. The additional weight 70 is removed from the outer surface of the counterweight 60 by being pulled out from the fitting hole 73 and the pair of attachment portions 61.

According to the above embodiment, when the working device 13 or the attachment heavier than the working device 13 is attached to the support bracket 16 at the front of the swivel base 12 instead of the standard working device 13. In addition, by attaching the additional weight 70 to the outer surface of the counterweight 60, the weight on the swivel base 12 side can be increased, so that the weight balance between the swivel base 12 side and the work device side can be maintained. The posture of the backhoe 1 can be sufficiently stabilized inside.
Further, when attaching the work device 13 provided as a standard or another work device or attachment lighter than the work device 13 to the support bracket 16, the additional weight 70 is removed from the outer surface of the counterweight 60, whereby the swivel base 12. The weight balance between the swivel base 12 and the work device 13 can be maintained without excessively increasing the weight on the side, and the output of the engine 31 can be sufficiently exerted to improve the workability of the backhoe 1. .

Further, since the additional weight 70 is fixed to the outer surface of the counterweight 60 via the mounting means 72 after passing through the temporarily fixed state by the temporary fixing means 71, when the additional weight 70 is fixed to the counterweight 60, the crane It is not necessary to hold the mounting posture of the additional weight 70 using the holding member, and the mounting work can be performed safely. The same applies to the removal work.
Moreover, the temporary fixing means 71 has a simple structure for preventing the protrusion 74 of the additional weight 70 inserted into the fitting hole 73 of the counterweight 60 by the locking pin 75 as described above. The attaching / detaching operation of the additional weight 70 via the temporary fixing means 71 is not complicated.

As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to said embodiment. For example, a plurality of fitting holes 73 constituting the temporary fixing means 71 are formed on the outer surface of the counterweight 60, and accordingly, a plurality of protrusions 74 to be inserted into the fitting holes 73 are formed on the front surface of the additional weight 7. May be. In accordance with this, a temporary fixing means 71 for temporarily fixing the additional weight 70 with a plurality of locking pins 75 may be adopted.
Further, it is possible to adopt a configuration in which a plurality of additional weights 70 are fixed to the outer surface of the counterweight 60 via the temporary fixing means 71 and the mounting means 72 so as to be freely attached.

In addition, the cross-sectional shape of the locking pin 75 can be any of a circular shape, an elliptical shape, a polygonal shape, and the like, whereby the first through hole 77 of the counterweight 60 and the protrusion 74 of the additional weight 70 are formed. The two through holes 81 are formed in a shape that matches the cross-sectional shape of the locking pin 75.
Further, a fitting hole facing the first through hole 77 is formed on the inner peripheral wall of the counterweight 60 on the side of the turning board 25 of the fitting hole 73, and the locking pin 75 is connected to the first through hole 77 and the second through hole. It is possible to prevent the protrusion 74 of the additional weight 70 from coming off by being inserted through the hole 81 and the fitting hole. The second through hole 81 is a bottomed hole, and the hole and the first Of course, it is possible to prevent the protrusion 74 of the additional weight 70 from coming off by inserting the locking pin 75 into the through hole 77.

A plurality of additional weights corresponding to the work device to be attached may be prepared.
Further, the configuration in which protectors are provided on both sides of the counterweight 60 does not disturb the configuration of the present invention.
Further, the backhoe 1 is made into an ultra-small turning type in which the work device 13 is pivotally supported on the center side of the turning body 3, the turning body 3 and the equipment mounted thereon are configured in the opposite direction, and the rear bonnet 52 is placed on the side It is also possible to use a part-support system configuration.

It is a disassembled perspective view which shows the attachment state of the counterweight and additional weight of the backhoe concerning embodiment of this invention. It is a disassembled perspective view which shows the attachment state of the additional weight to the backhoe. It is principal part sectional drawing which shows the attachment state to the counterweight of an additional weight. It is a left view of the backhoe concerning embodiment of this invention. It is a top view of the turntable and traveling device of the backhoe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Backhoe 2 Traveling device 3 Rotating body 12 Rotating base 13 Working device 16 Support bracket 25 Rotating substrate 31 Engine 50 Bonnet 52 Rear bonnet 60 Counterweight 70 Additional weight 71 Temporary fixing means 72 Mounting means 73 Fitting hole 74 Protrusion 75 Locking Pin 88 Connector 90 Locking means

Claims (3)

  Temporary fixing means (71) for temporarily fixing the additional weight (70) to the counterweight (60) arranged at the rear of the swivel base (12), and the additional temporarily fixed by the temporary fixing means (71) The weight of a swivel working machine, wherein the additional weight (70) is mounted via mounting means (72) for removably fixing the weight (70) to the counterweight (60).   The temporary fixing means (71) is provided on the outer surface of the counterweight (60) so as to be opened rearward and on the front surface of the additional weight (70). ) Inserted into the fitting hole (73) from the upper surface of the counterweight (60) and inserted into the fitting hole (73). The weight of the turning work machine according to claim 1, further comprising a retaining member (75) for retaining the retaining member.   The weight of the swivel work machine according to claim 1 or 2, wherein the front surface of the additional weight (70) is formed in a concave curved shape substantially along the outer surface of the counterweight (60).

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