JP3898511B2 - Excavator working equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a working device for a hydraulic excavator that is suitably used for excavating work such as earth and sand.
[0002]
[Prior art]
In general, a construction machine such as a hydraulic excavator includes a lower traveling body, an upper revolving body provided on the lower traveling body so as to be able to swivel, and a work device provided on the front side of the upper revolving body. .
[0003]
The working device includes a boom that is provided on an upper swing body constituting a vehicle body of a hydraulic excavator and is lifted and lowered by a boom cylinder, an arm that is provided on a tip side of the boom and is rotated by an arm cylinder, It is comprised by the bucket provided in the front end side and rotated by the bucket cylinder.
[0004]
Here, the arm is formed in a box shape by an upper plate, a lower plate, and left and right side plates, and a bucket mounting portion is provided on the tip side thereof. And the bracket of the bucket is rotatably connected to the bucket mounting portion using a connecting pin.
[0005]
In addition, in order to protect the arm from excavated material such as earth and sand excavated by the bucket, a lower plate reinforcing plate is fixedly attached to the lower plate of the arm so as to be overlapped, and the lower plate reinforcing plate is spaced left and right. There is known a hydraulic excavator provided with a protective member made of a plurality of square members extending in the front and rear directions (for example, Japanese Patent Application Laid-Open No. 2001-271371).
[0006]
[Problems to be solved by the invention]
By the way, the excavator by the prior art mentioned above hold | maintains an excavation thing in a bucket by rotating (cloud operation | movement) so that a bucket may be folded to the lower board side of an arm, when excavating. For this reason, when rocks, crushed stones, etc. are excavated with a bucket and these rocks are piled up on a bucket, the following problems arise.
[0007]
That is, the rock in the bucket hits the lower plate reinforcing plate of the arm and the protective material due to vibration, impact, etc. generated during the operation of the work device, the turning operation of the upper rotating body or the sudden operation of the bucket cloud, the lower plate reinforcing plate, There is a problem that the protective material is worn and damaged early. Further, when fine earth and sand enter the pin coupling portion between the arm and the bucket, there is a problem of causing wear of the connecting pin provided in the pin coupling portion.
[0008]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to protect the lower plate of the arm from the excavated object during excavation work, etc. It is an object of the present invention to provide a working device for a hydraulic excavator capable of preventing damage.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, a working device for a hydraulic excavator according to the present invention includes a boom that is provided on a body of the hydraulic excavator and is lifted and lowered by a boom cylinder, and is rotated by an arm cylinder that is provided on a distal end side of the boom. And a bucket that is provided on the tip side of the arm and is rotated by a bucket cylinder. The arm is formed in a box shape by an upper plate, a lower plate, a left side plate, and a right side plate, and the tip of the arm On the side, a bucket mounting portion to which the bracket of the bucket is connected using a connecting pin is provided.
[0010]
The feature of the structure adopted by the invention of claim 1 is that the lower plate of the arm is spaced forward and backward in the left and right directions to protect the arm from the excavated material excavated by the bucket. extending a plurality of protective material is provided, the lower plate of the arm the screw seat provided located between respective protective material, the base end side is the order to shield from the excavated matter in front Symbol lower plate is drilled by said bucket A shield plate is provided that is fixed to the screw seat and extends along the protective material so as to cover the bucket mounting portion of the arm with the distal end being a free end.
[0011]
With this configuration, a shield plate is fixedly attached to the lower plate of the arm via a screw seat, and this shield plate can cover from the screw seat to the bucket mounting portion of the arm. The lower plate of the arm including the portion can be cut off from the excavated material that has fallen from the bucket, and the lower plate of the arm can be prevented from coming into contact with the excavated material and being worn or damaged. When the shield plate is worn or damaged, the shield plate can be easily replaced by removing the bolt attached to the screw seat.
[0012]
In this case , the lower plate of the arm is provided with a plurality of protective materials that are separated from the left and right and extend in the front and rear directions in order to protect the arm from the excavated material excavated by the bucket, and the screw seat has each protection. It is set as the structure arrange | positioned between materials. By comprising in this way, the lower board of an arm can be protected from excavated material with a protective material. In addition, the screw seat can be accommodated between the protective members, and the screw seat can also be protected from the excavated material.
[0013]
According to the invention of claim 2 , the shielding plate is formed by using a single plate material having flexibility. With this configuration, even when the shielding plate is extended to the bucket side, the shielding plate can be bent and deformed by being pushed by the bucket when the bucket is rotated, so that the shielding plate prevents the bucket from rotating. And a wide range from the lower plate of the arm to the base end side of the bucket can be covered.
[0014]
According to a third aspect of the present invention , the shield plate is attached to the screw seat using a bolt, and a presser plate is provided between the shield plate and the bolt so as to sandwich the shield plate between the screw seat. The plate is provided with a receiving hole for receiving the head of the bolt. With this configuration, the head of the bolt can be accommodated in the accommodation hole provided in the presser plate, and the head of the bolt can be protected from the excavated material. It can be securely attached to the seat.
[0015]
Furthermore, the invention of claim 4 is configured such that a position adjuster for adjusting the position of the shielding plate relative to the arm is provided between the screw seat and the shielding plate. By comprising in this way, the position of the shielding board with respect to an arm can be changed suitably using a position adjustment tool.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a working device for a hydraulic excavator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings of FIGS. First, FIG. 1 to FIG. 7 show a first embodiment of the present invention.
[0017]
Reference numeral 1 denotes a lower traveling body of a hydraulic excavator, and 2 an upper revolving body mounted on the lower traveling body 1 so as to be able to swivel. The lower traveling body 1 and the upper revolving body 2 constitute a vehicle body of the hydraulic excavator. . Here, a cab 4, a building cover 5, a counterweight 6, and the like are provided on the revolving frame 3 of the upper revolving structure 2. A working device 11 described later is attached to the front side of the revolving frame 3 so as to be able to move up and down.
[0018]
11 is a working device provided on the front side of the upper swing body 2 so as to be able to be lifted and lowered. The working device 11 includes a boom 12 whose base end side is provided on the front side of the turning frame 3 so as to be able to be lifted and lowered; An arm 13 rotatably provided on the tip end side of the boom 12, a backhoe-type bucket 14 rotatably provided on the tip end side of the arm 13, and an arm 13 and a bucket cylinder 19 described later. The first bucket link 15 provided in the first bucket link, the second bucket link 16 provided between the first bucket link 15 and the bucket 14, and provided between the revolving frame 3 and the boom 12. A boom cylinder 17, an arm cylinder 18 provided between the boom 12 and the arm 13, and a bucket cylinder 19 provided between the arm 13 and the bucket links 15 and 16 are configured. To have.
[0019]
Here, the arm 13 is formed in an elongated box shape having a substantially square cross section by the upper plate 13A, the lower plate 13B, the left side plate 13C, and the right side plate 13D. Further, a bucket mounting portion 13E serving as a cylindrical boss portion is provided on the distal end side of the arm 13.
[0020]
Further, the bucket 14 is formed of a plurality of steel plates or the like, and has a bottom plate 14A that is curved in a concave shape, side plates 14B and 14B that are fixed to the left and right sides of the bottom plate 14A, and a base end side of the bottom plate 14A. The left and right brackets 14C and 14C are provided upright with an interval. Each bracket 14 </ b> C of the bucket 14 is pin-coupled to the bucket mounting portion 13 </ b> E of the arm 13 via the connecting pin 20.
[0021]
The first bucket link 15 of the bucket links 15 and 16 is connected at one end side to the tip end side of a rod 19B extending and contracting from the tube 19A of the bucket cylinder 19 using a connecting pin 21, and the other end side is connected to the other. The pin 22 is used to connect to the arm 13. The second bucket link 16 has one end connected to the connecting pin 21 and the other end connected to the bracket 14 </ b> C of the bucket 14 by the connecting pin 23.
[0022]
Reference numeral 24 denotes a reinforcing plate provided on the lower plate 13B of the arm 13. The reinforcing plate 24 is formed by using, for example, a steel plate, and extends forward and rearward along the lower plate 13B of the arm 13. . The reinforcing plate 24 is fixedly attached by welding so as to overlap the lower plate 13B of the arm 13.
[0023]
25, 25,... Are a plurality of protective materials fixed side by side in the left and right directions on the surface of the reinforcing plate 24, and the protective material 25 is made of a square columnar square steel material. Then, the protective material 25 is welded to the reinforcing plate 24 to extend forward and rearward (in the length direction of the arm 13) at equal intervals in the left and right directions, and the lower plate 13B of the arm 13 is attached to the bucket 14. It protects from the excavated material.
[0024]
.. Are a plurality of screw seats provided between the protective members 25 and fixed to the reinforcing plate 24. The screw seats 26 are attached to the reinforcing plate 24 by welding. Here, as shown in FIG. 5, the surface 26 </ b> A of the screw seat 26 is disposed so as to be substantially flush with the surface 25 </ b> A of the protective material 25.
[0025]
Reference numeral 27 denotes a shield plate that is located on the lower plate 13B side of the arm 13 and is detachably attached to the screw seat 26. The shield plate 27 is a substantially square shape using a flexible material such as a rubber material or a resin material. It is formed as a single flat plate having a shape, and its base end side 27A is fixed to the screw seat 26 by a bolt 29 described later.
[0026]
The shielding plate 27 extends so as to cover the bucket mounting portion 13 </ b> E of the arm 13 with the distal end side 27 </ b> B being a free end, and is in contact with the bottom plate 14 </ b> A of the bucket 14 in a bent state. Further, the shielding plate 27 extends by a certain amount in the left and right directions from the lower plate 13B of the arm 13, and covers the connecting pin 20 that connects the bucket 14 to the arm 13 and the connecting pin 22 that connects the bucket link 15 to the arm 13. It is like that. As described above, the shielding plate 27 is configured to shield the reinforcing plate 24, the protective material 25, and the connecting pins 20 and 22 from the excavated material that spills from the bucket 14.
[0027]
Reference numeral 28 denotes a presser plate that sandwiches the shielding plate 27 with the screw seat 26. The presser plate 28 is made of a rectangular steel plate or the like. The base plate 27 </ b> A of the shielding plate 27 is sandwiched between the presser plate 28 and the screw seat 26, and a bolt 29 having a head 29 </ b> A is screwed into the screw seat 26 from the presser plate 28. It is fixed to the screw seat 26.
[0028]
The hydraulic excavator according to the present embodiment has the above-described configuration. The hydraulic excavator rotates the upper swing body 2 and rotates the boom 12, the arm 13 and the like to move the bucket 14 to a desired excavation location. Then, the bucket 14 is rotated to excavate earth and sand.
[0029]
By the way, during the above excavation work, excavated items such as rocks and crushed stones are piled up on the bucket 14. If the bucket 14 is suddenly turned in this state, the upper turning body 2 is turned. The excavated material spills from the bucket 14 due to vibration, impact, etc., and falls toward the tip side of the arm 13.
[0030]
Therefore, in the present embodiment, the reinforcing plate 24 fixed to the lower plate 13B of the arm 13 is provided with a screw seat 26 positioned between the protective members 25, and the screw seat 26 is provided with a base of the shielding plate 27. The end side 27 </ b> A is fixed and attached, and the distal end side 27 </ b> B of the shielding plate 27 is extended to the bucket attachment portion 13 </ b> E located on the distal end side of the arm 13.
[0031]
For this reason, even if the excavated material falls toward the tip side of the arm 13, the shield plate 27 can avoid a situation in which the excavated material directly collides with the reinforcing plate 24 and each protective material 25. The material 25 can be prevented from being worn and damaged at an early stage, and the lower plate 13B of the arm 13 can be protected from the excavated material by the reinforcing plate 24, the protective material 25 and the shielding plate 27.
[0032]
In addition, since the shield plate 27 is extended to the left and right by a certain dimension from the lower plate 13B of the arm 13 and the connecting pins 20 and 22 are covered from the lower side by the shield plate 27, for example, fine earth and sand Even if it falls toward the tip side of the arm 13, it is possible to prevent the earth and sand from adhering to the connecting pins 20, 22 and the like by the shielding plate 27. For this reason, the malfunction that the connection pins 20 and 22 are worn and damaged early can be prevented, and the bucket 14 can be smoothly rotated by the connection pins 20 and 22.
[0033]
Further, since the surface 26A of the screw seat 26 is arranged so as to be substantially flush with the surface 25A of the protective material 25, the shielding plate 27 can be brought into contact with the surface 25A of the protective material 25 without any gap, and It is possible to prevent the excavated object falling toward the screw seat 26 from entering between the shielding plate 27 and the surface 25A of the protective member 25, and to prevent the screw seat 26 from being worn or damaged by the excavated object. .
[0034]
Further, since the shield plate 27 is detachably attached to the screw seat 26 using the bolt 29, even if the shield plate 27 is worn or damaged by the excavated material, the shield plate 27 can be easily replaced by the bolt 29. be able to.
[0035]
Furthermore, since the shielding plate 27 is formed using a flexible material such as a rubber material, the distal end side 27B of the shielding plate 27 can be brought into contact with the bottom plate 14A of the bucket 14 while being bent and deformed. The bottom plate 14A of the bucket 14 can be partially and stably covered by the plate 27, and the durability and life of the bucket 14 can be improved.
[0036]
Next, FIG. 8 shows a second embodiment of the present invention. The feature of this embodiment is that a holding hole for receiving the head of a bolt in a holding plate that holds the shielding plate between the screw seat. It is that it was set as the structure which provides. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0037]
31 is a press plate used in the present embodiment, and the press plate 31 is provided between the shielding plate 27 and the bolt 29 in substantially the same manner as the press plate 28 described in the first embodiment. The shielding plate 27 is clamped between the screw seat 26 by the tightening force. Here, the presser plate 31 is formed to be thicker than the presser plate 28 according to the first embodiment. The holding plate 31 has a receiving hole 31 </ b> A for receiving the head 29 </ b> A of the bolt 29.
[0038]
Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, since the holding plate 31 is provided with the receiving hole 31A for receiving the head 29A of the bolt 29, the head 29A of the bolt 29 can be protected from the excavated material by the receiving hole 31A. In addition, since the wear and damage of the bolt 29 can be prevented, the shield plate 27 can be securely attached to the screw seat 26 using the bolt 29.
[0039]
Next, FIG. 9 shows a third embodiment of the present invention. The feature of this embodiment is that a position adjuster for adjusting the position of the shielding plate relative to the arm is provided between the screw seat and the shielding plate. It is in the configuration. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0040]
Reference numeral 41 denotes a position adjustment bracket as a position adjustment tool provided between the screw seat 26 and the shielding plate 27. The position adjustment bracket 41 is formed using a plate material having a substantially U-shaped cross section.
[0041]
Here, the position adjustment bracket 41 includes an upper plate portion 41A that is fixedly attached to the screw seat 26 with bolts 42 and the like, and a bent plate portion 41B that is bent and extends from the upper plate portion 41A in a substantially L shape. And a lower plate portion 41C that is bent substantially in an L shape from the bent plate portion 41B and extends in parallel with the upper plate portion 41A. The base end side 27A of the shielding plate 27 is fixedly attached to the lower plate portion 41C of the position adjusting bracket 41 using bolts 43, nuts 44, and the like.
[0042]
Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, since the shielding plate 27 is attached to the screw seat 26 using the position adjustment bracket 41, the length of the bent plate portion 41 </ b> B of the position adjustment bracket 41 is changed to shield the arm 13. The height dimension H (refer FIG. 9) of the board 27 can be adjusted suitably. Further, by changing the mounting position of the shielding plate 27 with respect to the lower plate portion 41 </ b> C of the position adjustment bracket 41, the shielding plate 27 can be appropriately adjusted with respect to the arm 13, for example, in the front and rear directions.
[0043]
In the present embodiment, the case where the surface 26A of the screw seat 26 is arranged to be substantially flush with the surface 25A of the protective material 25 has been described as an example, but the present invention is not limited to this. For example, it is good also as a structure which arrange | positions the lower surface of a screw seat in the position lower than the surface 25A of the protective material 25. FIG. Even in this case, the shielding plate 27 can be brought into contact with the surface 25A of the protective member 25, and a problem that the excavated material enters the screw seat side from between the shielding plate 27 and the protective member 25 can be prevented.
[0044]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the lower plate of the arm is provided with a plurality of front and rear portions spaced apart left and right to protect the arm from the excavated material excavated by the bucket. the protective material is provided, each of said located between the protective material the screw seat provided, the base end side is the screw seat to shield from drilling material that is excavated by the previous SL said bucket a lower plate to the lower plate of the arm Since the shield plate extending along the protective material is provided so as to cover the bucket mounting portion of the arm with the distal end side being a free end, the lower plate of the arm is excavated by the bucket including the bucket mounting portion. Therefore, it is possible to prevent the lower plate of the arm from coming into contact with the excavated material and to be worn and damaged, and to improve the durability and life of the arm. Further, even if the shielding plate is worn or damaged, the shielding plate can be easily replaced by removing the bolts attached to the screw seat, and the shielding plate can be easily replaced.
[0045]
Moreover , since the screw seat is arranged between the protective members provided on the lower plate of the arm, the screw seat can be accommodated between the protective members, and the screw seat can be protected from the excavated material. Durability, life, etc. can be improved.
[0046]
According to the invention of claim 2 , since the shielding plate is formed by using a single flexible plate material, even when the shielding plate is extended to the bucket side, the shielding plate is not used when the bucket is rotated. The shield plate can cover the wide range from the lower plate of the arm to the base end side of the bucket without interfering with the rotational movement of the bucket. In addition, the lifetime can be increased.
[0047]
Further, according to the invention of claim 3 , since the holding plate is provided with the receiving hole for receiving the head of the bolt, the head of the bolt can be protected from the excavated material by the receiving hole, and the wear of the bolt Damage can be suppressed and the shield plate can be securely attached to the screw seat.
[0048]
Furthermore, in the invention of claim 4 , since the position adjusting tool for adjusting the position of the shielding plate with respect to the arm is provided between the screw seat and the shielding plate, the position adjusting tool is used for the position of the shielding plate with respect to the arm. The shielding plate can be arranged at an appropriate position with respect to the arm.
[Brief description of the drawings]
FIG. 1 is a front view showing a working device for a hydraulic excavator according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of the main part as viewed from the direction of arrows II-II in FIG. 1 with the shield plate removed from the arm, the reinforcing plate, the protective material, and the screw seat.
3 is an enlarged view of a main part of a bucket, an arm, and a shielding plate as seen from the direction of arrows III-III in FIG.
4 is an enlarged view of the main part similar to FIG. 3 with the shielding plate removed. FIG.
5 is a cross-sectional view of an arm, a reinforcing plate, a protective material, a shielding plate, and the like when viewed from the direction of arrows VV in FIG.
6 is a cross-sectional view of an arm, a reinforcing plate, a protective material, a shielding plate, and the like when viewed from the direction of arrows VI-VI in FIG.
7 is an enlarged view of a main part of the partially broken portion showing the arm, bucket, shielding plate and the like in FIG. 1 in an enlarged manner. FIG.
8 is a cross-sectional view similar to FIG. 5, showing an arm, a reinforcing plate, a protective material, a shielding plate, and the like according to a second embodiment of the present invention.
FIG. 9 is a cross-sectional view similar to FIG. 6, showing an arm, a reinforcing plate, a protective material, a shielding plate, and the like according to a third embodiment of the present invention.
[Explanation of symbols]
11 Working device 12 Boom 13 Arm 13A Upper plate 13B Lower plate 13C Left side plate 13D Right side plate 13E Bucket mounting portion 14 Bucket 20, 21, 22, 23 Connecting pin 24 Reinforcing plate 25 Protective material 26 Screw seat 27 Shielding plate 27A Base end side 27B Tip side 28, 31 Presser plate 29 Bolt 29A Head 31A Receiving hole 41 Position adjustment bracket (position adjustment tool)

Claims (4)

A boom that is provided on the body of the hydraulic excavator and is raised and lowered by a boom cylinder, an arm that is provided at the tip of the boom and that is rotated by an arm cylinder, and that is provided at the tip of the arm and rotated by a bucket cylinder A bucket mounting portion, wherein the arm is formed in a box shape by an upper plate, a lower plate, a left side plate and a right side plate, and a bracket of the bucket is connected to a tip side of the arm using a connecting pin In the excavator working device provided with
The lower plate of the arm is provided with a plurality of protective materials that are separated from left and right and extend forward and rearward to protect the arm from excavated material excavated by the bucket. the screw seat provided located between respective protective material, prior Symbol proximal side for the lower plate to shield from drilling material that is excavated by the bucket is secured to the screw seat the tip side of the arm is a free end A working apparatus for a hydraulic excavator, characterized in that a shielding plate extending along the protective material is provided so as to cover a bucket mounting portion. The working device for a hydraulic excavator according to claim 1, wherein the shielding plate is formed by using a single plate material having flexibility. The shield plate is attached to the screw seat using a bolt, and a press plate is provided between the shield plate and the bolt so as to sandwich the shield plate between the screw seat, and the head portion of the bolt is accommodated in the press plate. The working device for a hydraulic excavator according to claim 1 or 2 , wherein a receiving hole is provided. The working device for a hydraulic excavator according to claim 1, 2 or 3 , wherein a position adjuster for adjusting the position of the shielding plate relative to the arm is provided between the screw seat and the shielding plate.

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