JP2001348903A - Bending type arm for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending type arm for a working machine capable of conducting accurate positioning works by inhibiting the deflection of the regions of arm sections extending by itself without being parallel with a rotating cylinder. SOLUTION: The first regions A extending in parallel with the second rotating cylinders 12 (14) and the second regions B extending by themselves without being parallel with the second rotating cylinders 12 (14) are formed to the first arm sections 4 (6) by positioning the first supporting sections 41 (43) and the second supporting sections 42 (44) while being mutually separated at fixed distances along the longitudinal direction of the first arm sections 4 (6), and reinforcing sections 35 (37) extending along the longitudinal direction of the second regions B so as to mutually connect the two supporting sections 41, 42 (43, 44) and reinforcing the second regions B are formed to the second regions B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding arm used for a working machine such as a crane and a hydraulic shovel.

[0002]

2. Description of the Related Art A folding arm, which can be bent in a complicated manner by rotatably connecting a plurality of arms, is widely used in construction work machines such as a boom arm mechanism of a hydraulic shovel and a jib mechanism of a crane. Used in form.

FIG. 13 shows a conventional general structure of such a folding arm. Foldable arm 1 shown
Reference numeral 00 denotes a first arm portion 104 rotatably connected to the base 102 via the support pin 101, and a first arm portion 104 rotatably connected to the distal end of the first arm portion 104 via the support pin 103. A second arm unit 106 and a second arm unit 106
And a third arm portion 108 rotatably connected to a tip end of the third arm portion via a support pin 105. Further, a hook 119 for hanging a load, for example, is provided at the tip of the third arm portion 108.

[0004] Between the base 102 and the first arm 104, a hydraulically operated first rotary cylinder 110 for rotating the first arm 104 with respect to the base 102 about the support pin 101 is provided. Has been erected. In this case, the cylinder part of the first rotation cylinder 110 is rotatably connected to a first bracket 120 fixed to the base 102, and the rod part of the first rotation cylinder 110 is a first arm part. The second bracket 122 is rotatably connected to a second bracket 122 fixed to a base end of the base 104.

Similarly, between the first arm 104 and the second arm 106, the second arm 106
A hydraulically-operated second rotation cylinder 112 for rotating the first arm 104 with respect to the first arm 104 around the support pin 103 is provided. Also in this case, the cylinder portion of the second rotation cylinder 112 is rotatably connected to a third bracket 124 fixed to an intermediate portion of the first arm portion 104,
The rod portion of the second rotary cylinder 112 is rotatably connected to a fourth bracket 126 fixed to the base end of the second arm portion 106. The second arm 10
Similarly, a third rotating cylinder 114 and fifth and sixth brackets 128 and 130 are provided between the sixth arm 108 and the third arm 108 (actual opening 58-877).
No. 89).

[0006]

By the way, in the conventional folding arm 100 shown in FIG. 13, each of the brackets 12 supporting the rotating cylinders 110, 112, 114 is provided.
2, 124, 126 and 128 are formed as separate members, and are separated from each other along the longitudinal direction of the arm portions 104 and 106.
4, 106 are individually fixed.

[0007] Therefore, except for the most advanced arm 108, each arm 104 (106) has two mounting brackets 122, 124 (126, 128) for the rotary cylinders 110, 112 (112, 114). ), And each arm 104 (106) is
2 (the area between the third bracket 124 and the fourth bracket 126 and the area between the fifth bracket 128 and the sixth bracket 130) A and the rotating cylinder 112 (114) The region (the second bracket 122
And the third bracket 124 and an area B) between the fourth bracket 126 and the fifth bracket 128.

Therefore, in such a configuration, the bending cylinder 112 (114) and the arm 104 (10)
6), the bending moment is applied only to the arm portion 104 (106) in the region B, and the bending amount of the arm 100 increases in this region B. Such a large deflection makes it difficult to position a suspended load suspended via the hook 119.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an accurate positioning by suppressing bending of a region of an arm portion extending independently without being parallel to a rotating cylinder. An object of the present invention is to provide a folding arm of a working machine capable of performing a task.

[0010]

In order to solve the above-mentioned problems, the present invention provides a first arm portion rotatable about one fulcrum and a rotatably connected to the first arm portion. A first support portion connected and supported by a first rotation cylinder that rotates the first arm portion about the fulcrum. And a second support portion connected to and supported by a second rotating cylinder for rotating the second arm portion with respect to the first arm portion. When the first support portion and the second support portion are located at a predetermined distance from each other along the longitudinal direction of the first arm portion, the first arm portion has a second rotary cylinder and A first region extending in parallel and a second region extending independently without being in parallel with the second rotary cylinder; Are formed in the second region, and a reinforcing portion extending along the longitudinal direction of the second region and reinforcing the second region is formed so as to connect the two support portions to each other. It is characterized by the following.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a folding arm 1 according to an embodiment of the present invention. As shown, the folding arm 1
The first arm 4 is rotatably connected to the base 2 via a support pin 3, and the first arm 4 is rotatably connected to the tip of the first arm 4 via a support pin 5. Arm part 6 of 2
And a third arm portion 8 rotatably connected to a tip end of the second arm portion 6 via a support pin 7. At the tip of the third arm 8, for example, a hook 9 for hanging a load is provided.

Between the base 2 and the first arm 4, there is provided a hydraulically operated first rotary cylinder 10 for rotating the first arm 4 with respect to the base 2 about the support pin 3. Has been erected. In this case, the cylinder portion 10a of the first rotary cylinder 10 is rotatably connected to the bracket 20 fixed to the base 2, and the rod portion 10b of the first rotary cylinder 10
Is rotatably connected to a first support portion 41 provided at a base end of the first arm portion 4.

In addition, between the first arm 4 and the second arm 6, a hydraulic operation for rotating the second arm 6 about the support pin 5 with respect to the first arm 4. The second rotary cylinder 12 is provided. Also in this case, the cylinder portion 12a of the second rotary cylinder 12 is rotatably connected to the second support portion 42 provided on the first arm portion 4, and the rod portion of the second rotary cylinder 12 The portion 12b is rotatably connected to a third support portion 43 provided at a base end of the second arm portion 6.

Also, between the second arm portion 6 and the third arm portion 8, a hydraulic operation for rotating the third arm portion 8 about the support pin 7 with respect to the second arm portion 6. The third rotary cylinder 14 is provided. Also in this case, the cylinder portion 14a of the third rotary cylinder 14 is rotatably connected to the fourth support portion 44 provided on the second arm portion 6, and the rod portion of the third rotary cylinder 14 The portion 14b is rotatably connected to a bracket 30 provided at the base end of the third arm portion 8.

The support portions 41, 42, 43, 44 for supporting the rotary cylinders 10, 12, 14 are spaced apart from each other along the longitudinal direction of the arm portions 4, 6. In particular,
In the present embodiment, the first and second arm portions 4, 6
Is divided into approximately three equal parts by a distal region X, a proximal region Z, and an intermediate region Y located between the distal region X and the proximal region Z. 42 and 44 are located in the intermediate area Y. Therefore, except for the most advanced arm 8, each arm 4 (6) has two supporting portions 41, 42 for the rotary cylinders 10, 12 (12, 14).
(43, 44), and each arm 4 (6) is connected to a first region (the second support 42 and the first support 43) extending in parallel with the rotary cylinder 12 (14). A between the second support portion 44 and the bracket 30) and a second region (the first support portion 41 and the second support portion 41) extending independently without being parallel to the rotary cylinder 12 (14). Support part 42
And an area B) between the first support portion 43 and the second support portion 44.

Therefore, in this embodiment, the bending moment acting on the folding arm 1 is received by both the rotary cylinder 12 (14) and the arm 4 (6) in the first area A. In the area B of No. 2
A bending moment is applied only to (6), and the bending amount of the arm 1 increases in the second region B. Therefore, the bending arm 1 according to the present embodiment is provided with reinforcing portions 35 and 37 that reinforce the second region B and suppress the bending of the second region B. Hereinafter, the reinforcing portions 35 and 37 will be described in detail. However, since the reinforcing portions 35 and 37 provided on the two arms 4 and 6 have the same configuration, here, the reinforcing of the first arm 4 is performed. The description will be made by taking the unit 35 as an example.

As shown in FIG. 2 to FIG.
Is used to connect the two support portions 41 and 42 to each other.
Extends along the longitudinal direction of the region B. Reinforcing part 35
Has a pair of substantially parallel plate portions 50 and 51 extending from the arm portion 4 in a direction substantially perpendicular to the longitudinal direction of the first arm portion 4. Reinforcing ribs 53, 54, 55, and 56 are provided on both sides of each of the plate portions 50 and 51 to connect the plate portions 50 and 51 and the arm portion 4 to distribute stress. In addition, in each of the plate portions 50 and 51, a pin hole 41 of each of the support portions 41 and 42 through which a support pin (not shown) for rotatably supporting the rotary cylinders 10 and 12 is inserted.
a, 42a are formed.

The plate portions 50 and 51 are connected to each other by a connecting portion 52.
Are connected to each other. As shown in detail in FIG. 6, the connecting portion 52 includes a first connecting portion 52 a extending along the longitudinal direction of the plate portions 50 and 51, and a first connecting portion 5.
2a in a direction substantially orthogonal to the longitudinal direction of the first connecting portion 52a.
a and second and third connecting portions 52b and 52c extending so as to rise from both sides. In this case, the first connecting portion 52a is connected to the plates 50, 51 by welding or the like, and closes an opening formed between the plates 50, 51 and extending in the longitudinal direction of the plates 50, 51. The second and third connecting portions 52b and 52c are connected to the plate portions 50 and 51 by welding or the like, and are formed between the plate portions 50 and 51 and provided at both ends in the longitudinal direction of the plate portions 50 and 51. Close the located opening. That is, the reinforcing portion 35
Is formed in a box shape by the pair of plate portions 50 and 51 and the connecting portion 52, thereby reinforcing the second region B and suppressing the bending of the second region B. In the present embodiment, the support portions 41 and 42 (pin holes 41a and 42a) are located outside the connecting portion 52. That is, the support portion 4
The connection part 52 is located between the first and second parts 42.

As described above, in the folding arm 1 of the present embodiment, the two support portions 41, 42 (43, 44) are connected to the second region B which receives the maximum bending moment. As described above, the reinforcing portion 35 (37) extending along the longitudinal direction of the second region B and reinforcing the second region B is formed. The reinforcing portion 35 (37) is connected to the arm 4 (6) in a direction substantially orthogonal to the longitudinal direction of the arm 4 (6).
It is formed in a box shape by a pair of substantially parallel plate portions 50 and 51 extending so as to rise from (6) and a connecting portion 52 connecting these plate portions 50 and 51 to each other. Moreover, the openings formed in the longitudinal direction and at both ends of the reinforcing portion 35 (37) by the pair of plate portions 50 and 51 are closed by the connecting portion 52. Therefore, the rigidity of the second region B is significantly increased by the reinforcing portion 35 (37), and the amount of deflection is significantly reduced. Therefore, an accurate positioning operation can be performed. Further, instead of individually welding the support portions 41, 42, 43, and 44 of the rotary cylinder to the arm portions 4 and 6 as in the related art, the pair of support portions 41 and 42 (43 and 44) are integrated. Can be welded to the arm portions 4 and 6, thereby facilitating the manufacture of the arm 1.

FIG. 11 shows an example in which the folding arm 1 of this embodiment is applied to a wheel crane, and FIG. 12 shows an example in which the folding arm 1 is applied to a crawler crane. FIG.
In the application form of (1), the folding arm 1 is used as a jib mechanism, and has a configuration in which the first arm 4 is directly connected to the third arm 8. As shown,
In this configuration, the work of positioning the suspended load M over the building S through the narrow opening Q can be accurately performed. On the other hand, in the application form of FIG.
Is used as a boom arm mechanism, and has first to third arm portions 4, 6, and 8 as in FIG.
As shown in the figure, in this configuration, an advanced positioning operation for arranging the object G at a plurality of points P can be performed accurately.

In this embodiment, the state-of-the-art third
The form of the tip of the arm portion 8 can take various forms other than the form of the hook 9, such as a form in which a winch wire rope is hung via a sheave, or a form in which an earthwork member such as a bucket or a drill is provided. it can. Also, the reinforcing portion 35
The configuration of (37) is not limited to the configuration described above. For example, as shown in FIG. 7, the reinforcing portions 35 (3) are formed as one unit in which the plate portions 50 and 51 and the connecting portion 52 are integrally formed.
7) may be configured, and as shown in FIG.
The plate portions 50 and 51 may be formed integrally with the arm portion 4 (6). Further, as shown in FIG.
The (pin holes 41a, 42a) may be located inside the connecting portion 52. Further, as shown in FIG. 10, the reinforcing portions 35 may be configured by providing the support portions 41 and 42 as separate brackets on the arm portion 4 and connecting the brackets 41 and 42 with the rod 60.

[0023]

As described above, according to the folding arm of the present invention, accurate positioning work can be performed by suppressing the bending of the arm portion extending independently without being parallel to the rotating cylinder. be able to.

[Brief description of the drawings]

FIG. 1 is a side view of a folding arm according to an embodiment of the present invention.

FIG. 2 is a side view showing details of a first arm portion constituting the folding arm of FIG. 1;

FIG. 3 is a view in the direction of arrow C in FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a sectional view taken along the line BB of FIG. 2;

FIG. 6 is a perspective view of a connecting portion provided on a first arm portion of FIG. 2;

FIG. 7 is a perspective view according to a first modification of the reinforcing portion.

FIG. 8 is a side view according to a second modified example of the reinforcing portion.

FIG. 9 is a side view according to a third modification of the reinforcing portion.

FIG. 10 is a side view according to a fourth modification of the reinforcing portion.

11 is a schematic view showing a state in which the folding arm of FIG. 1 is applied to a wheel crane.

FIG. 12 is a schematic view showing a state in which the folding arm of FIG. 1 is applied to a crawler crane.

FIG. 13 is a side view of a conventional folding arm.

[Description of Signs] 1 ... Bendable arm 4 ... First arm section 6 ... Second arm section (first arm section) 8 ... Third arm section (second arm section) 10 ... First Rotating cylinder 12 ... second rotating cylinder (first rotating cylinder) 14 ... third rotating cylinder (second rotating cylinder) 41 ... first supporting part 42 ... second supporting part 43 ... third support part (first support part) 44 ... fourth support part (second support part) 35, 37 ... reinforcing part 50, 51 ... plate part 52 ... connecting part

Claims (3)

[Claims] A first arm portion rotatable about one fulcrum; and a second arm portion rotatably connected to the first arm portion, wherein the first arm portion is provided. A first supporting portion connected to and supported by a first rotating cylinder for rotating the first arm portion about the fulcrum; and a second arm portion rotating with respect to the first arm portion. A bending arm provided with a second support portion to which a second rotating cylinder to be moved is connected and supported, wherein the first support portion and the second support portion are the first arm. The first arm portion includes a first region extending in parallel with the second rotating cylinder and a second rotating cylinder, which are arranged at a predetermined distance from each other along the longitudinal direction of the portion. And a second region extending independently without being formed in parallel with the second region. Folding type arm, wherein a reinforcing portion for reinforcing the and second region extending along the longitudinal direction of the second region so as to connect to each other are formed. 2. The reinforcing portion connects a pair of substantially parallel plate portions extending from the first arm portion in a direction substantially perpendicular to the longitudinal direction of the first arm portion so as to rise from the first arm portion. The folding arm according to claim 1, wherein the folding arm is formed in a box shape by the connecting portion. 3. The folding arm according to claim 2, wherein openings formed at both longitudinal ends of the reinforcing portion by a pair of substantially parallel plate portions are closed by the connecting portion. .