JP2015059343A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow positioning of a weight member in relation to a weight case with a relatively simple configuration.SOLUTION: By fastening screw parts 41a of case fixing bolts 41 inserted from beneath an upper frame 20 to case screw holes 33a in pedestal parts 33 of a weight case 31, the upper frame 20 and the weight case 31 are fastened and fixed. Positioning boss parts 41b that extend upward projecting from the pedestal parts 33 are provided on the more distal side than the screw parts 41a of the case fixing bolts 41. By inserting the positioning boss parts 41b into positioning holes 35a of a weight member 35, the weight member 35 is positioned in relation to the weight case 31 and placed on the pedestal parts 33.

Description

  The present invention relates to a work machine.

  When transporting a work machine to a construction site, it is necessary to place the work machine on a transport vehicle such as a truck or a trailer, but the weight that can be transported by the transport vehicle is limited. In order to cope with this weight limitation, a work machine including a stacked counterweight that can be disassembled and transported is known (for example, see Patent Document 1).

  In the work machine of Patent Document 1, a plurality of weight members are stacked and accommodated in a weight case attached to an upper frame. Then, before the work machine is transported to the construction site, the weight member is lifted by a crane and removed from the weight case so as to cope with the weight limit.

  After arriving at the construction site, the plurality of weight members are lifted by a crane and sequentially inserted into the weight case, whereby the weight members are stacked and accommodated in the weight case. Thereafter, a plurality of weight members are integrally fastened and fixed by inserting a fixing bolt from the upper surface side of the weight member and fastening it to a screw hole provided on the weight case side.

  By the way, when the weight members are stacked and accommodated in the weight case, it is necessary to align the weight members with respect to the weight case and to align the stacked weight members.

  Patent Document 2 discloses a configuration in which positioning concave portions and convex portions are provided on the upper and lower laminated surfaces of the weight member, and the respective concave portions and convex portions are loosely fitted to perform mutual alignment. ing.

JP 2006-177118 A JP 2000-314154 A

  However, the conventional work machine has a problem in that it is necessary to configure a convex part for positioning the weight member as a separate part and attach it to the weight member, which is costly.

  The present invention has been made in view of such a point, and an object thereof is to enable positioning of a weight member with respect to a weight case with a relatively simple configuration.

  The present invention is directed to a work machine including an upper swing body and a counterweight mounted on the upper frame of the upper swing body, and has taken the following solution.

That is, according to the first aspect of the present invention, the counterweight is formed in a box shape having an upper opening and is fastened and fixed on the upper frame by a case fixing bolt, and the counterweight is inserted and removed through the opening of the weight case. A weight member accommodated in the weight case;
The upper frame is formed with an insertion hole for allowing the thread portion of the case fixing bolt to be inserted from below the upper frame toward the weight case.
On the upper surface of the bottom wall portion of the weight case, a pedestal portion for placing the weight member is integrally provided,
The pedestal portion is formed with a case screw hole that penetrates in the vertical direction and is fastened with a screw portion of the case fixing bolt.
The weight member is formed with a positioning hole at a position corresponding to the case screw hole when viewed from the axial direction of the case screw hole,
On the tip side of the screw portion in the case fixing bolt, there is provided a positioning boss portion extending and projecting upward from the upper surface of the pedestal portion,
The weight member is positioned with respect to the weight case by inserting the positioning boss portion through the positioning hole and placing the weight member on the pedestal portion.

  In the first invention, the upper frame and the weight case are fastened and fixed by fastening the screw portion of the case fixing bolt inserted from below the upper frame to the case screw hole of the base portion of the weight case. . A positioning boss that protrudes and extends above the pedestal is provided on the tip side of the screw portion of the case fixing bolt. When the positioning boss is inserted into the positioning hole of the weight member, the weight member is weighted. It is positioned with respect to the case and placed on the pedestal.

  With such a configuration, by providing a positioning boss part on the tip side of the screw part in the case fixing bolt, a function as a fastening part for fastening and fixing the upper frame and the weight case, and a weight member The function for positioning with the weight case can be made compatible.

  Here, the case fixing bolt is a component that is always used to fasten and fix the upper frame and the weight case. Therefore, by providing the case fixing bolt with a function as a positioning boss, a positioning boss that has been conventionally arranged as a separate part becomes unnecessary, and the cost can be reduced.

According to a second invention, in the first invention,
The weight case is integrally provided with a guide member having a guide hole penetrating in the vertical direction and having a threaded portion of a weight fixing bolt inserted therethrough,
The weight member is formed with a weight screw hole at a position corresponding to the guide hole when viewed from the axial direction of the guide hole,
The weight member is fastened and fixed to the weight case by fastening a screw portion of the weight fixing bolt inserted into the guide hole from below the guide member to the weight screw hole. It is what.

  In the second invention, the weight member and the weight case are fastened and fixed by fastening the screw portion of the weight fixing bolt inserted from below the guide member into the weight screw hole.

  With such a configuration, the fastening operation between the weight member and the weight case can be performed from below the upper frame, so that workability can be improved while ensuring the safety of the operator.

  Specifically, the conventional work machine has a structure in which a fixing bolt is inserted and fastened from the upper surface side of the weight member, so that an operator works on the upper surface of the weight member every time the weight member is disassembled and assembled. The workability was getting worse. In addition, it is necessary to install a guard rail etc. to ensure the safety of the worker on the upper part of the counterweight, but when transporting in the transport work, the guard rail must be removed to accommodate the height restriction, It took time and effort.

  On the other hand, in the present invention, after the weight member is accommodated in the weight case, the weight fixing bolt is fastened from below the upper frame. Therefore, the operator needs to get on and off the upper surface of the weight member. Therefore, workability can be improved while ensuring the safety of the worker.

According to a third invention, in the second invention,
The upper frame includes a bottom plate, and a pair of left and right support beams that are integrally formed with the bottom plate and extend in the vehicle front-rear direction and support the weight case.
The bottom wall portion of the weight case is formed with a recess portion that corresponds to the support beam and extends upward and extends in the vehicle front-rear direction.
The pedestal portion is integrally provided on the upper surface of the recess portion,
The guide member is attached to an outer surface of a side wall of the recess.

  In the third invention, the bottom wall portion of the weight case is recessed upward corresponding to the support beam of the upper frame. A pedestal is integrally provided on the upper surface of the recess. A guide member is attached to the outer surface of the side wall of the recess.

  Here, conventionally, after the guide member is embedded in the weight member, the guide hole is formed through the machining, so that the processing cost is high. Further, since the amount of the filler of the weight member is reduced by the volume of the guide member, it is difficult to ensure the weight of the weight member.

  On the other hand, in the present invention, since the guide member is attached to the side wall of the hollow portion of the weight case, it is easier to perform the processing operation and reduce the cost as compared with the case where the guide member is embedded in the weight member, A sufficient weight of the weight member can be secured.

  According to the present invention, the positioning boss portion is provided on the front end side of the screw portion in the case fixing bolt, thereby functioning as a fastening part for fastening and fixing the upper frame and the weight case, the weight member, and the weight case. And a function for performing positioning.

It is a side view which shows the structure of the working machine which concerns on embodiment of this invention. It is a top view which shows the structure of a working machine. It is AA arrow sectional drawing of FIG. 2 which shows the structure of a counterweight. It is front sectional drawing which expands and partially shows the structure of a counterweight.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use. In each figure, the up / down and front / back / left / right directions are indicated by arrows. Unless stated otherwise, the vertical direction will be described according to the directions indicated by these arrows.

  As shown in FIGS. 1 and 2, the work machine 10 is a hydraulic excavator in which an upper turning body 12 that can turn is mounted on a crawler-type lower traveling body 11.

  The upper swing body 12 includes an upper frame 20, an attachment 13 provided on the front end side of the upper frame 20 for performing excavation work such as earth and sand, a cab 15, a machine room 16, and a counterweight 30.

  The attachment 13 includes a boom 13a pivotally attached to a pair of vertical plates 22 (see FIG. 2) provided on the upper frame 20 on the base end side, and an arm pivotally attached to the distal end side of the boom 13a. 13b and a bucket 13c rotatably attached to the distal end side of the arm 13b. The boom 13a, the arm 13b, and the bucket 13c can move the attachment 13 up and down freely by extending and contracting the corresponding hydraulic cylinder 13d.

  The cab 15 is a rectangular box type cab equipped with a driving seat, various control devices, operation devices, and the like, and is installed on the left front portion of the upper frame 20 so as to be adjacent to the left side of the attachment 13. Has been.

  In the machine room 16, drive devices such as an engine and a hydraulic pump, a fuel tank, and the like are accommodated. A bonnet 17 that is opened and closed when maintenance of the engine or the like is performed is provided on the upper portion of the machine room 16.

  The upper frame 20 includes a bottom plate 21 and a pair of left and right vertical plates 22 that are integrally formed with the bottom plate 21 and extend in the vehicle front-rear direction. The rear part of the vertical plate 22 constitutes a support beam for supporting the counterweight 30.

  The counterweight 30 is installed at the rear part of the upper frame 20 in order to maintain the front and rear balance with the attachment 13. Since the counterweight 30 has a high weight, the counterweight 30 is configured to be disassembled during transportation.

  Specifically, as shown in FIG. 3, the counterweight 30 includes a weight case 31 that is formed in a box shape having an upper opening and is fastened and fixed on the upper frame 20 by a case fixing bolt 41. And a weight member 35 that is taken in and out through the opening and accommodated in the weight case 31.

  The bottom plate 21 of the upper frame 20 is formed with an insertion hole 20a through which the screw portion 41a of the case fixing bolt 41 is inserted from below the upper frame 20 toward the weight case 31.

  In the bottom wall portion of the weight case 31, a recess 32 is formed corresponding to the vertical plate 22 and extending upward and extending in the vehicle front-rear direction. The weight case 31 is placed on the upper surface of the vertical plate 22 by inserting the vertical plate 22 through the recess 32 from below.

  A pedestal 33 for placing the weight member 35 is integrally provided on the upper surface of the recess 32. The pedestal portion 33 is formed with a case screw hole 33a that penetrates in the vertical direction and to which the screw portion 41a of the case fixing bolt 41 is fastened.

  In order to lift the weight case 31 with a crane (not shown), a case suspension ring 31a with which a wire (not shown) can be engaged is provided with a gap around the periphery of the opening. The weight case 31 is placed on the upper surface of the vertical plate 22 by being lifted by a crane and lowered onto the upper frame 20.

  The weight member 35 includes a metal plate 36 placed on the pedestal 33, an upper casing 37 attached to the upper side of the plate 36, a lower casing 38 attached to the lower side of the plate 36, and an upper casing. 37 and a filling material 39 filled in the lower casing 38.

  The upper casing 37 is formed in a box shape having an upper opening. The lower casing 38 is provided at a position that avoids the recess 32 of the weight case 31. Three through holes 36 a are formed in the plate 36 at intervals in the vehicle width direction. As a result, when the filler 39 containing water, cement, iron scraps, and the like is poured from the opening of the upper casing 37, the lower casing 38 is also filled through the through holes 36 a of the plate 36.

  The plate 36 of the weight member 35 is formed with a positioning hole 35a and a weight screw hole 35b. The positioning hole 35a is formed at a position corresponding to the case screw hole 33a when viewed from the axial direction of the case screw hole 33a. The weight screw hole 35b is formed at a position corresponding to the guide hole 34a when viewed from the axial direction of a guide hole 34a of the guide member 34 described later.

  On the upper surface of the weight member 35, a weight suspension ring 35c that can be engaged with a wire (not shown) is provided at intervals in the vehicle width direction so as to be lifted by a crane (not shown). The weight member 35 is taken in and out of the weight case 31 through the opening of the weight case 31 in a state of being lifted by a crane, and is accommodated in the weight case 31.

  As shown in FIG. 4, a positioning boss portion 41 b that protrudes upward from the upper surface of the pedestal portion 33 is provided on the tip side of the screw portion 41 a in the case fixing bolt 41. That is, when the weight member 35 is placed on the pedestal portion 33, the positioning boss portion 41 b enters the positioning hole 35 a, thereby restricting the movement of the weight member 35 in the weight case 31 in the horizontal direction.

  The weight member 35 and the weight case 31 are allowed to be displaced by play between the positioning boss portion 41b and the positioning hole 35a, and the weight case 31 can be easily inserted and removed. The weight member 35 is sufficiently larger than the weight member 35.

  A guide member 34 is integrally attached to the outer surface of the side wall of the recess 32 in the weight case 31. The guide member 34 is formed with a guide hole 34a that penetrates in the vertical direction and through which the threaded portion 45a of the weight fixing bolt 45 is inserted.

  The weight member 35 is fastened and fixed to the weight case 31 by fastening the screw portion 45a of the weight fixing bolt 45 inserted into the guide hole 34a from below the guide member 34 to the weight screw hole 35b.

  As described above, according to the work machine 10 according to this embodiment, the upper frame 20 and the weight case 31 are fastened by providing the positioning boss portion 41b on the tip side of the screw portion 41a in the case fixing bolt 41. A function as a fastening part for fixing and a function for positioning the weight member 35 and the weight case 31 can be made compatible. This eliminates the need for a positioning boss that has conventionally been arranged as a separate component, and thus can reduce costs.

  Further, since the weight fixing bolt 45 is fastened from below the upper frame 20 after the weight member 35 is accommodated in the weight case 31, it is not necessary for the operator to get on and off the upper surface of the weight member 35. The workability can be improved while ensuring the safety of the worker.

<< Other Embodiments >>
About the said embodiment, it is good also as following structures.

  In this embodiment, although the attachment 13 provided with the bucket 13c for performing excavation work was demonstrated, it can change suitably according to the work content. For example, it may be an attachment equipped with a crusher for dismantling a high-rise building.

  In this embodiment, the weight case 31 is placed on the rear portion of the vertical plate 22 so that the counter weight 30 is supported by the vertical plate 22. However, a support beam different from the vertical plate 22 is provided. The counterweight 30 may be supported.

  As described above, the present invention provides a highly practical effect that the weight member can be positioned with respect to the weight case with a relatively simple configuration. .

10 work machines
12 Upper swing body 20 Upper frame
20a insertion hole
21 Bottom plate
22 Vertical plate (support beam)
30 counterweight
31 weight case
32 Indentation
33 pedestal
33a Case screw hole
34 Guide members
34a Guide hole
35 Weight material
35a Positioning hole
35b Weight screw hole
41 Case fixing bolt
41a Screw part
41b Positioning boss
45 Weight fixing bolt
45a Screw part

Claims (3)

A working machine comprising an upper swing body and a counterweight mounted on an upper frame of the upper swing body,
The counterweight is formed in a box shape with an opening at the top and is fastened and fixed on the upper frame by a case fixing bolt, and the counterweight is put in and out through the opening of the weight case and accommodated in the weight case. A weight member,
The upper frame is formed with an insertion hole for allowing the thread portion of the case fixing bolt to be inserted from below the upper frame toward the weight case.
On the upper surface of the bottom wall portion of the weight case, a pedestal portion for placing the weight member is integrally provided,
The pedestal portion is formed with a case screw hole that penetrates in the vertical direction and is fastened with a screw portion of the case fixing bolt.
The weight member is formed with a positioning hole at a position corresponding to the case screw hole when viewed from the axial direction of the case screw hole,
On the tip side of the screw portion in the case fixing bolt, there is provided a positioning boss portion extending and projecting upward from the upper surface of the pedestal portion,
The work machine is characterized in that the weight member is positioned with respect to the weight case by inserting the positioning boss portion into the positioning hole and placing the weight member on the pedestal portion. In claim 1,
The weight case is integrally provided with a guide member having a guide hole penetrating in the vertical direction and having a threaded portion of a weight fixing bolt inserted therethrough,
The weight member is formed with a weight screw hole at a position corresponding to the guide hole when viewed from the axial direction of the guide hole,
The weight member is fastened and fixed to the weight case by fastening a screw portion of the weight fixing bolt inserted into the guide hole from below the guide member to the weight screw hole. Work machine. In claim 2,
The upper frame includes a bottom plate, and a pair of left and right support beams that are integrally formed with the bottom plate and extend in the vehicle front-rear direction and support the weight case.
The bottom wall portion of the weight case is formed with a recess portion that corresponds to the support beam and extends upward and extends in the vehicle front-rear direction.
The pedestal portion is integrally provided on the upper surface of the recess portion,
The work machine, wherein the guide member is attached to an outer surface of a side wall of the recess.

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