JP2000240300A - Construction machinery and arm used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability and safety in disassembling works using a working device. SOLUTION: This construction machinery is so constituted that an arm cylinder fitting hole 28a provided in an arm 24 of a working device is arranged in the upper side and front side of a boom fitting hole 26A, and a working tool cylinder fitting hole 28B is arranged in the front side of the arm cylinder fitting hole 28A. This constitution can enhance the height from the ground attained by a grapple device 10 provided in the tip side of the arm 24 by extending/contracting the arm cylinder 12 with the boom 22 extended frontward in disassembling work. A high-rise building with high ground height can be thus disassembled with a cab 4 positioned in a long distance away from the grapple device 10 so that the workability and safety in disassembling works can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine suitably used for dismantling work, for example, for dismantling a building or the like, and an arm used therefor.

[0002]

2. Description of the Related Art Generally, as a construction machine suitably used for demolition work of a building or the like, a traveling body, a revolving body rotatably provided on the traveling body, and a revolving body provided on the revolving body so as to be capable of elevating. There has been known a construction machine that includes a working device, and performs a demolition operation of a building or the like using a grapple device or the like attached to the working device.

[0003] A conventional construction machine for dismantling work of this type will be described with reference to FIGS. 5 and 6.

In the drawing, reference numeral 1 denotes a crawler type traveling body;
Is a revolving unit provided on the traveling unit 1 so as to be revolvable. The revolving unit 2 includes a revolving frame 3 having a support bracket 3A for supporting a working device 7 described later, and a driver cab provided on the revolving frame 3. A cab 4 that is defined, and a building cover 5 that is provided on the revolving frame 3 at the rear side of the cab 4 and houses an engine, a hydraulic pump (both not shown), and the like.
And a counter weight 6 provided at the rear end of the turning frame 3.

A working device 7 is provided at the center of the front part of the revolving body 2 so as to be able to move up and down. The working device 7 includes a boom 8 attached to the support bracket 3A of the turning frame 3 so as to be able to move up and down, and a boom 8 The arm 14 described below is attached to the distal end side of the arm 8 so as to be able to move up and down, and is rotatably attached to the distal end side of the arm 14 via the link mechanism 9, and is a closed position indicated by a solid line and an open position indicated by a two-dot chain line. Claw member 10 that opens and closes between
A and 10A for demolition work grapple device 10
A boom cylinder 11 provided between the support bracket 3A of the revolving frame 3 and the boom 8, an arm cylinder 12 provided between the boom 8 and the arm 14, and a link between the arm 14 and the link mechanism 9. And the work implement cylinder 13 provided in the main body.

An arm 14 is attached to the tip end of the boom 8 so as to be able to move up and down. As shown in FIG. 6, the arm 14 has left and right webs 14A (only one is shown) and left and right webs 14A.
Upper flange 14B closing the upper surface of right web 14A
A lower flange 14C for closing the lower surfaces of the left and right webs 14A; and a web 14A, an upper flange 14B,
It is formed in an elongated box shape surrounded by an end face plate 14D provided at the rear end of the lower flange 14C.

[0007] A boom mounting portion 15 is provided on the rear side of the arm 14 on the side of the lower flange 14C.
The boom mounting portion 15 has a boom mounting hole 15A for mounting the front end side of the boom 8. On the other hand, a working tool mounting portion 16 is provided on the distal end side of the arm 14, and a working tool mounting hole 16A for mounting the grapple device 10 is formed in the working tool mounting portion 16. A bracket 17 protrudes rearward from the end face plate 14D of the arm 14, and an arm cylinder mounting hole 17A for mounting the arm cylinder 12 is formed in the bracket 17. A bracket 18 projects upward from the upper flange 14B of the arm 14, and a working tool cylinder mounting hole 18A for mounting the working tool cylinder 13 is formed in the bracket 18. Further, a link mounting hole 19 for mounting the link mechanism 9 is formed in the web 14A of the arm 14 at a position near the work implement mounting portion 16.

[0008] Here, the boom mounting hole 15A, the arm cylinder mounting hole 17A, and the work implement cylinder mounting hole 18 described above.
Looking at the mutual positional relationship of the arm 14 in the longitudinal direction of the arm 14, the arm cylinder mounting hole 17A is
A is provided on the rear side of the work implement cylinder mounting hole 18A.
Is provided on the front side of the boom mounting hole 15A.

The construction machine for dismantling work according to the prior art has the above-described configuration.
The boom 8 is raised and lowered by the arm cylinder 12
The arm 14 is raised and lowered by the operation tool cylinder 13
While the grapple device 10 is rotated, the claw member 10A of the grapple device 10 is opened and closed to dismantle a building or the like.

[0010]

When a building or the like is dismantled, scraps such as reinforcing bars and concrete pieces falling from the building to be dismantled are removed from the cab.
In order to avoid collision, etc., as shown in FIG. 5, the distance between the grapple device 10 for dismantling the building and the cab 4 is kept as large as possible by extending the boom 8 toward the front. There is a need.

However, in the above-described construction machine according to the prior art, the boom 8 is extended forward to perform the dismantling work of the building, and for example, from the ground G of the boom mounting portion 15 provided on the rear side of the arm 14. When the height of the arm cylinder 12 is reduced, the height of the work implement mounting portion 16 provided on the distal end side of the arm 14 from the ground G is larger than the height H1 described above. Also has a small height dimension H2 (H2 <H1).
The ground height that the grapple device 10 attached to the front end of the vehicle can reach is suppressed low.

Therefore, when performing the dismantling work of a building having a large ground height, it is necessary to move the grapple device 10 to a high position by, for example, extending the boom 8 obliquely upward by the boom cylinder 11. However, in this case, the entire construction machine must be brought close to the building, and the frequency of scraps from the demolition work dropping to the cab 4 or the like increases, and workability and safety during the demolition work are increased. There is a problem of lowering.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the related art, and has as its object to provide a construction machine capable of improving workability and safety when performing demolition work or the like using a work device. And

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a traveling body, a revolving body rotatably provided on the traveling body, and a working device attached to the revolving body. The working device includes a boom mounted on the revolving body so as to be capable of elevating, an arm mounted on the distal end of the boom so as to be able to elevate, a working tool mounted on the distal end of the arm, a revolving body and the boom. , An arm cylinder attached between the boom and the arm, and a work implement cylinder attached between the arm and the work implement.

A feature of the first aspect of the present invention is that the arm is provided below the rear end of the arm body, the arm body being formed in a box shape by left and right webs and upper and lower flanges. Boom mounting part, a work implement mounting part provided on the distal end side of the arm main body, an arm cylinder mounting part provided on the rear side of the arm main body located forward of the boom mounting part, and an arm cylinder mounting And a work tool cylinder mounting portion provided on the rear side of the arm main body, which is located on the front side of the arm.

With this configuration, when the arm cylinder is moved up and down by the arm cylinder with the boom extended forward, the work implement mounting portion of the arm is moved upward from the boom mounting portion. Can be done. As a result, the ground height at which the work tool attached to the work tool mounting portion of the arm can reach is increased, so that it is possible to disassemble a building having a large ground height with the boom extended forward. The workability and safety at this time can be improved.

According to a second aspect of the present invention, the distance between the arm cylinder mounting portion in the vertical direction and the vertical distance between the working tool cylinder mounting portion with respect to an imaginary line connecting the boom mounting portion and the work tool mounting portion is determined. Is set to be larger than

With this configuration, the moment acting on the arm about the boom mounting portion can be increased when the arm moves up and down about the boom mounting portion in accordance with the expansion and contraction of the arm cylinder. For this reason, the arm can be held in an appropriate working posture against the work reaction force acting on the arm via the work tool during the dismantling work, and the workability during the dismantling work can be improved. .

According to a third aspect of the present invention, the lengthwise separation between the boom mounting portion and the arm cylinder mounting portion is set smaller than the lengthwise separation between the arm cylinder mounting portion and the work tool cylinder mounting portion. I did it.

According to a fourth aspect of the present invention, the arm body includes:
The left and right webs are formed in a substantially triangular shape to form a substantially wedge-shaped box. The boom mounting portion is provided on a bracket protruding rearward from a rear end of the arm main body. The cylinder mounting portion is provided on a bracket projecting upward from an upper flange of the arm body.

According to a fifth aspect of the present invention, an arm used for a construction machine is formed by forming substantially triangular left and right webs, and upper and lower flanges for closing the upper and lower surfaces of the left and right webs. An end plate provided on the rear end side of the right web and the upper and lower flanges, a first bracket provided on the end plate so as to protrude rearward, and a first bracket located on the lower flange side. A boom mounting hole provided in the bracket, a left and right web, and a working tool mounting portion provided at a tip side of the upper and lower flanges, and a second tool provided to project upward at the rear side of the upper flange. A second bracket, an arm cylinder mounting hole provided in the second bracket above and in front of the boom mounting hole, and an arm cylinder mounting hole provided in the second bracket before the arm cylinder mounting hole. Work tool cylinder mounting hole There in that form.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 4 by taking an example in which the construction machine is applied to a construction machine used for demolition work of a building or the like. I do. In the present embodiment, the same components as those in the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 21 denotes a working device applied to the present embodiment in place of the working device 7 according to the prior art. The working device 21 includes a boom 22, an arm 24,
It comprises a grapple device 10, a boom cylinder 11, an arm cylinder 12, a work implement cylinder 13, and the like.

Reference numeral 22 denotes a boom according to the present embodiment, which is attached to the revolving unit 2 so as to be capable of raising and lowering. The boom 22 is formed in a substantially rectangular shape having a bent portion 22A at an intermediate portion in the length direction. I have. The base end of the boom 22 is attached to the support bracket 3A of the revolving frame 3, and the tip end of the boom 22 is attached to the arm 24. A bracket 23 for mounting the arm cylinder 12 is provided between the distal end side of the boom 22 and the bent portion 22A.

Reference numeral 24 denotes an arm according to the present embodiment, which is attached to the distal end of the boom 22 so as to be able to move up and down.
Are, as shown in FIGS. 2 and 3, left and right webs 25A, 25A having a substantially triangular shape, and left and right webs 25A.
An upper flange 25B closing the upper surface of A, a lower flange 25C closing the lower surfaces of the left and right webs 25A, and a rear end side of the left and right webs 25A, the upper flange 25B and the lower flange 25C are provided. It has an arm body 25 configured as a substantially wedge-shaped box with the end face plate 25D.

Reference numeral 26 denotes a first bracket fixed to the end face plate 25D of the arm main body 25 and protruding rearward. A boom mounting hole 26A (boom mounting portion) for mounting the boom is provided.

Reference numeral 27 denotes a working tool mounting portion provided on the distal end side of the arm body 25. The working tool mounting portion 27 is welded to the left and right webs 25A, the upper flange 25B, and the lower flange 25C by welding or the like. A work implement mounting hole 27A for mounting the grapple device 10 is formed on the inner peripheral side of the fixed cylindrical body.

Reference numeral 28 denotes a second bracket fixedly provided on the rear side of the upper flange 25B constituting the arm body 25, that is, near the end face plate 25D, and protruding upward.
The bracket 28 is provided with an arm cylinder mounting hole 28A (arm cylinder mounting portion) for mounting the arm cylinder 12 located above and in front of the boom mounting hole 26A.
A working tool cylinder mounting hole 28B (working tool cylinder mounting portion) for mounting the working tool cylinder 13 is provided at a position forward of A. That is, the arm cylinder mounting hole 28A and the working tool cylinder mounting hole 28B are provided in a single bracket 28, for example, compared with the case where the arm cylinder mounting hole 28A and the working tool cylinder mounting hole 28B are provided in separate brackets. The configuration is simplified.

A link mounting hole 29 for mounting the link mechanism 9 is formed in the web 25A of the arm body 25 near the work implement mounting portion 27.

Here, the boom mounting hole 26A, the arm cylinder mounting hole 28A, the work implement cylinder mounting hole 28
B in the longitudinal direction of the arm 24, the arm cylinder mounting hole 28A has the boom mounting hole 2
Front side of the distance A from 6A (tip side of arm 24)
The working tool cylinder mounting hole 28B is provided on the front side by a separation dimension B from the arm cylinder mounting hole 28A. The above-mentioned separation dimension A is set smaller than the separation dimension B (A <B).

When a virtual line connecting the center of the boom mounting hole 26A and the center of the work implement mounting hole 27A is represented by CC, the distance from the center of the arm cylinder mounting hole 28A to the virtual line CC is assumed. The vertical separation dimension D is set to be larger (D> E) than the vertical separation dimension E from the center of the work implement cylinder mounting hole 28B to the imaginary line CC.

The construction machine according to the present embodiment has the working device 21 as described above. When performing the dismantling work of a building or the like using the working device 21, first, as shown in FIG. The boom cylinder 11 extends the boom 22 forward, and the cab 4 is separated from the building to be dismantled (not shown) as much as possible, and the arm cylinder 12 causes the arm 24 to face upward on the distal end side of the boom 22. Raise and lower.

In this case, the boom 22 is extended forward, and the height dimension of the boom mounting portion (boom mounting hole 26A) provided at the rear end of the arm 24 from the ground G is set, for example, to the arm 14 according to the prior art. In a state where the height dimension H1 is equal to the height dimension from the ground G of the boom mounting section 15 provided on the rear side, the arm cylinder 12 is contracted, and the working tool mounting hole provided on the distal end side of the arm 24. The height H3 of the 27A from the ground G can be made larger (H3> H1) than the height H1 described above.

Therefore, as compared with the conventional construction machine, the ground height that the grapple device 10 can reach while the cab 4 is largely separated from the grapple device 10 for dismantling the building is increased. Can be done. Therefore, the frequency of scraps falling into the cab 4 or the like at the time of dismantling work is reduced, and workability and safety when performing the building dismantling work can be improved.

The vertical distance D from the center of the arm cylinder mounting hole 28A to the virtual line CC is larger than the vertical distance E from the center of the working tool cylinder mounting hole 28B to the virtual line CC. Since the setting is made large, the moment acting on the arm 24 around the position of the boom mounting hole 26A when the arm 24 is raised and lowered by the arm cylinder 12 can be increased. This allows the arm 2 to resist the work reaction force acting on the arm 24 via the grapple device 10 during the dismantling operation.
4 can be held in a proper working posture, and the workability of the dismantling work can be improved.

After the dismantling work of the building or the like is completed, the boom 22 is held in such a position that the upper surface thereof is slightly upwardly inclined from the tip end toward the bent portion 22A as shown in FIG. Then, the working device 21 is shifted to the transport position by lowering the distal end side of the arm 24 and folding the grapple device 10 below the boom 22. Then, the construction machine is loaded on the trailer 30 or the like and transported to another work site with the working device 21 in the transport posture.

In this case, the working device 21 in the transport position
Is set as a height dimension H4 from the ground G to the top of the bracket 23 provided on the boom 22.

Here, temporarily, the arm cylinder mounting hole 28
When A is provided behind the boom mounting hole 26A, the mounting position of the bracket 23 with respect to the boom 22 is
When the work apparatus 21 is moved to the bent position 22A of the boom 22 in the direction indicated by the arrow F in FIG. 4 and the working device 21 is in the transporting posture, the height from the ground G to the uppermost portion of the bracket 23 is equal to the height described above. It becomes larger than the height dimension H4.

On the other hand, in the present embodiment, since the arm cylinder mounting hole 28A is provided on the front side of the boom mounting hole 26A, the bracket 23 is provided on the front side of the bent portion 22A of the boom 22. By doing
The height from the ground G to the top of the bracket 23 is H
4, so that the safety when transporting the construction machine can be improved.

Thus, according to the present embodiment, the arm cylinder mounting hole 28A is disposed above and in front of the boom mounting hole 26A, and the work tool cylinder mounting hole 28B is positioned forward of the arm cylinder mounting hole 28A. The arm cylinder 12 is expanded and contracted while the boom 22 is extended forward during the dismantling work,
The height above the ground that the grapple device 10 provided on the distal end side of the arm 24 can reach can be increased. For this reason, the grapple device 10 that dismantles the building is
Can be dismantled while maintaining a large distance from the building, the frequency of scraps generated by the dismantling work dropping into the cab 4 etc. decreases, Workability and safety can be improved.

The working device 2 for transporting construction machines
4, the height H4 from the ground G to the uppermost part of the bracket 23 provided on the boom 22 can be kept low, thereby ensuring safety during transportation. Can be.

Further, assuming that a virtual line connecting the center of the boom mounting hole 26A and the center of the work implement mounting hole 27A is CC, the distance from the center of the arm cylinder mounting hole 28A to the virtual line CC is assumed. Since the vertical separation dimension D is set to be larger than the vertical separation dimension E from the center of the work implement cylinder mounting hole 28B to the imaginary line CC, the arm cylinder 1
2, the moment acting on the arm 24 can be increased around the position of the boom attachment hole 26A when the arm 24 is raised and lowered. For this reason, the arm 24 can be held in an appropriate working posture against the work reaction force acting on the arm 24 via the grapple device 10 during the dismantling operation, and the workability of the dismantling operation is improved. Can be.

In the above-described embodiment, the construction machine provided with the crawler-type traveling body 1 has been described as an example. However, the present invention is not limited to this. For example, a wheel-type traveling body is provided. It can also be applied to construction machinery.

In the above-described embodiment, the case where the grapple device 10 is used as the working tool has been described as an example.
The present invention is not limited to this, and for example, a breaker that performs a crushing operation for crushing a building or the like, a lifting magnet that adsorbs a reinforcing steel bar or an iron trash, and loaded on a transport truck or the like may be used as a working tool.

Further, by attaching a bucket as a working tool, the bucket can be used as a hydraulic shovel.

[0046]

As described in detail above, according to the first aspect of the present invention, the arm constituting the working device is provided with an arm body formed in a box shape by the left and right webs and the upper and lower flanges. A boom mounting portion provided on the lower side of the rear end of the arm main body, and a work implement mounting portion provided on the distal end side of the arm main body,
An arm cylinder mounting portion provided on the rear side of the arm body, located in front of the boom mounting portion, and a working tool cylinder mounting portion provided on the rear side of the arm body, located in front of the arm cylinder mounting portion. When the arm is moved up and down by the arm cylinder with the boom extended forward during dismantling, etc., the work implement mounting part of the arm moves upward from the boom mounting part Can be done. As a result, the height of the ground at which the work tool attached to the work tool mounting portion can reach increases, so that the demolition work can be performed with the work tool for dismantling the building largely separated from the cab. The frequency of scraps falling on the cab or the like at the time is reduced, and workability and safety during dismantling work can be improved.

According to the second aspect of the present invention, the vertical distance between the arm cylinder mounting portion and the vertical line between the work cylinder mounting portion and the virtual line connecting the boom mounting portion and the work tool mounting portion is determined. Since the size is set to be larger than the dimension, the moment acting on the arm about the boom mounting portion can be increased when the arm moves up and down around the boom mounting portion in accordance with the expansion and contraction of the arm cylinder.
For this reason, the arm can be held in an appropriate working posture against the work reaction force acting on the arm via the work tool during the dismantling work, and the workability during the dismantling work can be improved. .

According to the third aspect of the present invention, the lengthwise separation dimension between the boom mounting portion and the arm cylinder mounting portion is set as follows:
The distance between the arm cylinder mounting portion and the work tool cylinder mounting portion in the length direction can be set smaller.

According to the fourth aspect of the present invention, the arm body is formed as a substantially wedge-shaped box by forming the left and right webs into a substantially triangular shape, and the boom mounting portion is provided at the rear end of the arm body. The arm cylinder mounting part and the work tool cylinder mounting part are provided on the bracket protruding upward from the upper flange of the arm main body.For example, a bracket for providing the arm cylinder mounting part The configuration can be simplified as compared with a case where a bracket for providing the work tool cylinder mounting portion is provided on the arm body.

Further, according to the fifth aspect of the present invention, the arms used for the construction machine are provided so as to protrude rearward from the left and right webs, the upper and lower flanges, the end plate, and the end plate. A first bracket, a boom mounting hole provided in the first bracket positioned on the lower flange side, a left and right web, and a working tool mounting portion provided on the tip side of the upper and lower flanges. A second bracket provided on the rear side of the upper flange so as to protrude upward, an arm cylinder mounting hole provided in the second bracket above and in front of the boom mounting hole, and an arm When the arm is moved up and down by the arm cylinder with the boom extended forward, the work tool cylinder mounting hole provided on the second bracket is located forward of the cylinder mounting hole. To The work implement attachment portion of the arm than the boom mounting hole can be moved to the upper side, work tool provided on the implement mounting portion of the arm can be increased ground height attainable.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a construction machine according to an embodiment of the present invention is being dismantled.

FIG. 2 is an enlarged view of a main part showing only an arm in FIG. 1 in an enlarged manner.

FIG. 3 is a plan view of the arm shown in FIG. 2;

FIG. 4 is an enlarged front view showing a state in which the construction machine is loaded on a trailer in a transport posture.

FIG. 5 is a front view showing a state in which a conventional construction machine is being dismantled.

FIG. 6 is an enlarged view of a main part showing only an arm in FIG. 5 in an enlarged manner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 10 Grapple device (work implement) 11 Boom cylinder 12 Arm cylinder 13 Work implement cylinder 21 Work implement 22 Boom 24 Arm 25 Arm main body 25A Web 25B Upper flange 25C Lower flange 25D End plate 26 First bracket 26A Boom mounting hole (boom mounting portion) 27 Work tool mounting portion 28 Second bracket 28A Arm cylinder mounting hole (arm cylinder mounting portion) 28B Work tool cylinder mounting hole (work tool cylinder mounting portion)

Claims (5)

[Claims] 1. A traveling body, a revolving body rotatably provided on the traveling body, and a working device attached to the revolving body, wherein the working device is attached to the revolving body so as to be capable of elevating. A boom, an arm mounted on the distal end side of the boom so as to be capable of raising and lowering, a work implement mounted on the distal end side of the arm, a boom cylinder mounted between the revolving body and the boom, In a construction machine comprising an arm cylinder attached between the boom and an arm and a working tool cylinder attached between the arm and a working tool, the arm includes left and right webs and upper and lower webs. An arm body formed in a box shape by the flange of the arm body, a boom mounting portion provided below the rear end of the arm body, a working tool mounting portion provided at a distal end side of the arm body, and the boom mounting From department An arm cylinder mounting portion provided on the rear side of the arm body located on the front side, and a working tool cylinder mounting portion provided on the rear side of the arm body located on the front side of the arm cylinder mounting portion. A construction machine characterized by comprising. 2. An arm cylinder mounting portion having a vertical separation dimension larger than a vertical separation dimension of an arm cylinder mounting portion with respect to an imaginary line connecting the boom mounting portion and the work tool mounting portion. The construction machine according to claim 1, comprising: 3. A lengthwise distance between the boom mounting portion and the arm cylinder mounting portion is set smaller than a lengthwise distance between the arm cylinder mounting portion and the work tool cylinder mounting portion. 3. The construction machine according to 1 or 2. 4. The arm body is formed as a substantially wedge-shaped box by forming the left and right webs into a substantially triangular shape, and the boom mounting portion projects rearward from a rear end of the arm body. 4. The construction machine according to claim 1, wherein the arm cylinder mounting portion and the work tool cylinder mounting portion are provided on a bracket and protrude upward from an upper flange of the arm body. 5. 5. A left and right web having a substantially triangular shape, upper and lower flanges for closing upper and lower surfaces of the left and right webs, and a left and right web and upper and lower flanges. An end face plate provided on the rear end side, a first bracket provided on the end face plate so as to protrude backward, and a boom mounting hole provided on the first bracket located on the lower flange side A left and right web, and a work implement mounting portion provided on the tip side of the upper and lower flanges; a second bracket provided on the rear side of the upper flange so as to protrude upward; An arm cylinder mounting hole provided on the second bracket above and in front of the boom mounting hole, and an operation provided on the second bracket located on the front side of the arm cylinder mounting hole. Composed of mounting cylinder mounting holes An arm used for construction equipment.