JP2000355483A - Hook set of power shovel having crane specifications - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage of a support shaft by the slant pulling except the hand down direction of the regular direction of a vertical direction. SOLUTION: This power shovel is provided with a bucket on the end of an arm connected to the boom of the power shovel, a hook set installed on the outside end of the bucket and specifications taken as available. In the power shovel, a support body 22 is arranged in parallel at intervals down the bottom of a boss 21 turnably supported to the fixed shaft provided the shaft in the horizontal direction fixingly, while penetrating right/left two projections provided integrally on the upper end of the bucket and connected to a hydraulic cylinder through a bucket link. A link pin 23 is fixed to two support bodies 22 and a swivel 25 stored a ball bearing 24 for supporting the rotation of the vertical axis direction turnably in its inside is provided on the link pin 23 and the hook 26 supporting an upper shaft 26a is connectingly provided through the inside ball bearing 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook set for a power shovel, which is provided with a bucket pivoted by hydraulic operation at an end of an arm connected to a boom of the power shovel to enable a crane specification.

[0002]

2. Description of the Related Art Conventionally, when a crane is used for suspending a load (article) by a power shovel, a bucket is provided with a hook set, and FIG. 3 (a) shows an example of the whole structure. FIG.

[0003] In the figure, a boom 2 and an arm 3 are connected to a power shovel body 1, and a bucket 4 is attached to an end of the arm 3. Angle and the arm angle β between the boom 2 and the arm 3 are detected by an angle sensor, and the suspension load of the boom 2 is detected. An external hanging load, which is rotatably mounted by hydraulic pressure or the like and is applied to a hook 5 attached to the outer end of the bucket 4, is monitored so as to be within an allowable range of related laws and regulations such as the Labor Standards Act. .

FIG. 3 (b) shows a bucket 4 rotatably attached to a tip end of an arm 3 corresponding to the portion A in FIG. 3 (a) by bucket links 3b arranged in parallel by a hydraulic cylinder 3a. FIG. 4 is a side view of the single bucket removed from the arm 3. In the figure, the bucket 4a is provided with two left and right protrusions (ears) 4a to which the bucket link 3b from the hydraulic cylinder 3a is fixed at the upper left end in the figure, and penetrates the protrusion 4a. The hook 5 is attached via a shaft 4b to be connected, and the specific structure is shown in FIG.

[0005] In FIG.
The bucket links 3b, 3b connected to the hydraulic cylinder 3a are connected to two left and right protrusions 4a, 4a projecting from the upper left end of the bucket 4 in FIG. The shaft 4b is fixedly attached to the bucket 4 through the projecting portions 4a, 4a.

On the other hand, a hook 1 is attached to the tip of the fixed shaft 4b.
A boss 6 to which 1 (corresponding to 5 in FIG. 3) is attached is rotatably attached. The boss 6 is screwed with a shank coupling 7 integrally provided with three projecting portions 7a to 7c having two concave portions formed in the middle below.
Has been fixed by.

The upper part is provided with three projections 9a to 9c so as to be fitted (engaged) with the concave part of the intermediate part formed by the three projections 7a to 7c of the shank coupling 7. A ball bearing swivel 9 having protrusions 9d to 9f of the same shape and containing therein a ball bearing that supports vertical rotation (the same applies hereinafter in the figure).
Are the protruding portions 7a to 7c of the shank coupling 7.
Upper projection 9 of ball bearing swivel 9 fitted with
a to 9 c are rotatably connected via a pin 10.

On the other hand, a hook 11 having three projections 11a to 11c fitted on the lower projections 9d to 9f of the ball bearing swivel 9 in the same manner as described above is rotatable via a pin 12. Linked to Reference numeral 13 in the figure denotes a stopper provided at the opening of the hook.

At the time of crane work, hook the upper end of a hanging string or a chain fixed to an article (loading body) on the hook 11,
After locking with the stopper 13, the engine of the power shovel body is driven to operate the boom 2, the arm 3, and the hydraulic cylinder 3a to lift the load, move to a predetermined position, and suspend the work. It is supposed to.

[0010]

The above-mentioned known devices have the following problems. FIG. 5 (b)
FIG. 5 is a side view of a small model showing a state in which the hook set unit of FIG. 4 is stationary on the ground in the horizontal direction, and FIG. 4A is a plan view. In FIG.

(I) There is no problem because the article is hooked on the hook 11 and the normal lifting is lifted right above.
When the power shovel turns or runs in an oblique direction and the hook 11 is turned at a certain angle (as indicated by an arrow B) with respect to the horizontal position shown in FIG.
The portion C close to the pin close to the hook 11 may not rotate.

When this situation occurs, the dimension up to the inner diameter of the pin 10 and the hook 11 close to the boss 6 (overhang)
Due to L, an unbalanced load is applied to the pin 10 on the side near the boss 6 shown in FIGS. 4 and 5, and the pin 10 is broken.

(Ii) On the other hand, in a small machine, there is no space between the boss 6 and the shank coupling 7 for inserting the screw nut 8 of the shank coupling 7 shown in FIG. As described above, the positioning of the shank coupling 7 to be screwed is performed by the detent pin 8a.

In this case as well, if the swiveling function of the ball bearing swivel 9 is normal, only a small torque acts on the pins 10 and 12, but for some reason, for example, dust or sand is mixed in the ball bearing swivel 9. When a trouble such as the occurrence of trouble occurs, a rotation torque is generated in the above-described detent pin 8a, thereby causing
However, there is a problem that there is a risk of breakage.

(Iii) There is also a work of immersing the hook set in seawater, and if the detent pin 8a is corroded, it will be broken, and the screw of the shank coupling 7 will be loosened.

(Iv) On the other hand, three projections 9a to 9c and 9d to 9f provided respectively on the upper and lower parts of the ball bearing swivel 9 for connecting to the upper shank coupling 7 and the lower hook 11, respectively. Are subjected to shear stress by the respective projecting portions and the projecting portion of the mating side which fits into the concave portion between the projecting portions.

FIG. 6 shows a state where the shank ring cup 7 which is particularly close to the boss 6 and the ball bearing swivel 9 described in the above (i) are connected by the pin 10 penetrating the projecting portion in which the ball bearing swivel 9 is fitted. It is a drawing for principal part description.
Pin 10 which penetrates as shown, has received an average shear stress in the four points of the i-d, the cross-sectional area of each of these points and S, when the diameter of the pin and ^{d, S = (πd 2/} 4 Therefore, when suspended in the vertical direction, the average force is F, which is within the range of the allowable shear stress, but when obliquely pulled, a force F 'acts at a distance of m from the fulcrum E. Therefore, the load on the cross-sections (a) and (b) is increased, resulting in breakage.

It is an object of the present invention to provide a crane-specific power shovel hook set having a simple structure in which a support shaft portion is not particularly damaged even when a normal vertical direction is inclined other than a hanging direction. I have.

[0019]

In order to solve the above-mentioned problems, the present invention adopts a method in which a bucket pivoted by hydraulic operation is provided at an end of an arm connected to a power shovel. In a power shovel that has a crane specification by attaching a hook set to an outer end of the bucket, the bucket is integrally provided at an upper end of a bucket rotatably attached to the arm end, and is connected to a hydraulic cylinder via a bucket link. A fixed shaft is provided in the horizontal direction passing through the two connected left and right protrusions, and a boss is rotatably supported on the fixed shaft, and below the bottom of the horizontal boss, A link pin is provided in which two support members are arranged in parallel and spaced apart from each other in the direction perpendicular to the fixed axis and fixed integrally, and penetrates and fixes the two support members arranged in parallel. Provided the link A ball bearing swivel, which is rotatably supported by the bearing and accommodates a ball bearing that supports rotation in the vertical axis direction, is provided, and a hook whose upper shaft portion is supported by the internal ball bearing is connected. It is characterized by:

Further, a boss portion rotatably supported on a fixed shaft fixed to the upper end portion of the bucket and fixed in a horizontal direction is formed in a hollow cylindrical shape, and is formed below a bottom portion of the boss portion. The two support members provided in each of the above are formed in a plate shape, and are fixed and provided integrally.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows a hook set attached to a crane-type power shovel showing one embodiment of the present invention, wherein (a) is a front sectional view,
(B) is a side view of a main part.

In the figure, reference numeral 21 denotes a fixed shaft (FIG. 4) which is integrally provided at the upper end of the bucket and penetrates two left and right protrusions (4a in FIG. 4) connected to the hydraulic cylinder via an arm. FIG. 1 which is rotatably fitted to and supported by 4b) of FIG.
(A) is a hollow cylindrical boss portion, and two plate-like support members 22 are arranged in parallel at an interval vertically below and in contact with the peripheral surface of the bottom of the boss portion 21. Has been
It is fixed and provided integrally by welding or the like.

The length of these two plate-like supports 22 in the direction perpendicular to the plane of the paper is, as shown in the side view of FIG. Are formed equal in length to both end faces.

A link pin 23 is fixedly provided horizontally in the drawing so as to pass through two plate-like supports 22 integrally fixed to the bottoms of the cylindrical boss portions 21 arranged in parallel. And a ball bearing swivel 2 having a built-in ball bearing 24 rotatably supported by the link pin 23 and supporting rotation in the vertical axis direction in the drawing.
5 upper protrusions 25a are provided.

Further, the ball bearing swivel 25
The upper shaft portion 26a of the hook 26 is fixedly attached to the ball bearing 24 inside. The hooking member 26 is pinned to the opening of the hook 26 at the upper portion so as not to protrude outward. Stopped by 27a.

FIGS. 2A and 2B mainly show a small hook set attached to a crane type power shovel similar to FIG. 1 showing another embodiment of the present invention, wherein FIG. 2A is a front sectional view, and FIG. It is a figure, and in the figure, the same code | symbol as the code | symbol described in FIG. 1 shall show the same or similar part. In this case (FIG. 2), as shown in FIG. 1, the ball bearing swivel 25 engages the casing 24a outside the ball bearing from the outside so that the screw 24b is fitted.
The lower part of the ball bearing swivel 25 is connected to the outer casing 24a of the ball bearing in which the ball bearing 24 is built in, and the lower part of the ball bearing swivel 25 is connected with the screw 24b as compared with the case of fixing with the screw 24b. .

Next, the operation will be described. The hook set 20 (FIGS. 1 and 2) according to the present invention is provided integrally with the upper end of the bucket 4 shown in FIGS. When attaching the hook set 20 to the fixed shaft 4b penetrating the two left and right protrusions 4a connected via the inner hole 21a of the uppermost cylindrical boss portion 21 of the hook set 20 shown in FIGS. Fixed shaft 4b
Are rotatably fitted and supported.

Next, the upper end of the hanging member fixed to the article (load) is locked to the lowermost hook 26, the power shovel is operated, and the boom 2, arm 3 and hydraulic cylinder 3a shown in FIG. Is driven to operate as a crane by the bucket 4, the same problem as the conventional product does not occur at the time of normal lifting. That is, the torsional motion of the article is absorbed by the ball bearing swivel.

However, in the case where the power shovel turns or runs by pulling an article in an oblique direction, in the conventional article shown in FIG. 5, a pin that performs a bending action in a direction perpendicular to the paper surface is provided.
Since the two (10 and 12) bearing swivels are respectively provided at both ends, the pin 12 near the hook may not operate smoothly due to the rotation angle of the hook as described above. It was frequently observed that an eccentric load was applied to 10 and pin breakage occurred. Further, in this case, the two pins 10 and 12 were limited in thickness (diameter) in terms of structure, and many portions were subjected to shear stress as shown in FIG. Further, in the small-sized machine, since the detent pin 8a used in place of the detent nut 8 of the shank coupling is thin, there is a high possibility of breakage.

On the other hand, in the case of the present invention, FIGS.
, The swinging motion along the plane of the paper is smoothly performed by the uppermost cylindrical boss portion 21 and the fixed shaft 4b (FIG. 4) of the bucket 4 penetrating through the boss hole 21a, and in a direction perpendicular to the plane of the paper. The rocking motion of the link pin 23 penetrates two parallel plate-like supports 22 integrally fixed to the bottom of the boss portion 21 and is rotatably fitted to and supported by the pin 23. With the upper projecting portion 25a of the ball bearing swivel 25, the operation is performed smoothly.

As described above, the two swinging motions in the right-angle direction are performed by the fixed shaft 4b having a high strength on the bucket side, and
The fitting action with the cylindrical boss portion 21 on the hook set side, and a constant thickness penetrating the two support members 22 arranged and fixed integrally in parallel on the bottom of the cylindrical boss portion 21 are provided. The link pin 23 and the bearing swivel upper protruding portion 25a are fitted smoothly to each other by two places of the fitting action,
Since the structure is simpler than that of a conventional product, it is possible to increase the strength. Also, there are few places where shear stress is applied. Therefore, it is possible to eliminate various troubles that are likely to occur in the above-mentioned conventional products.

The above embodiment (FIGS. 1 and 2)
A boss 21 rotatably supported by a fixed shaft 4b fixed to the upper end of the bucket 4 in a horizontal direction is formed into a hollow cylindrical member, and is provided below the bottom of the boss 21. Although the structure in which the two support members 22 provided are formed in a plate shape and fixed integrally is described, the boss portion 21 is rotatable by the fixed shaft 4b inserted into the inner diameter hole 21a. The outer peripheral portion may not necessarily be cylindrical. Of course, the two supports provided below the bottom of the boss 21 are not limited to plate-like bodies.

[0033]

As described above, according to the present invention,
At the end of the arm connected to the boom of the power shovel,
An upper end of a bucket rotatably attached to the arm end of a power shovel provided with a bucket pivoted by hydraulic operation and a hook set attached to an outer end of the bucket to enable crane specification. The left and right protrusions connected to the hydraulic cylinder via a bucket link are provided integrally with the hydraulic cylinder, and the shaft is fixedly provided in the horizontal direction, and the boss is rotatably supported on the fixed shaft. Provided
Below the bottom of the horizontal boss portion, two support members are arranged in parallel in a direction perpendicular to the fixed axis at an interval and integrally provided, and the two support members arranged in parallel A ball bearing swivel is provided which is fixedly provided with a link pin, is rotatably supported by the link pin, and houses therein a ball bearing which supports rotation in the vertical axis direction. The hooks supporting the upper shaft portion are connected and provided, so that the two swinging motions in the perpendicular direction are caused by the strong shaft on the bucket side and the cylindrical boss portion on the hook set side. A link pin 23 having a constant thickness penetrating the two support members 22 arranged and fixed integrally and in parallel to the bottom of the cylindrical boss portion, and the upper portion 2 of the bearing swivel and the fitting swivel. Smoothly performed by two positions for fitting cooperation with a, since the structure is simple as compared with the conventional products, it is possible to constitute a strong intensity. There are also few places where shear stress is applied. Therefore, it is possible to eliminate various troubles that are likely to occur in the conventional product.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, and FIG.
(B) is a side view of a main part.

FIGS. 2A and 2B show another embodiment of the present invention, wherein FIG. 2A is a front sectional view, and FIG.

3 (a) is a schematic explanatory view of a conventional crane-type power shovel, and FIG. 3 (b) is an enlarged side view of a main part of FIG. 3 (a).

FIG. 4 is a front view showing a hook set of a conventional crane-type power shovel.

FIG. 5 is a side view showing an example of use of the hook set of FIG. 4;

FIG. 6 is a view showing a main part of a hook set part of a conventional product.

[Description of Signs] 1 Power shovel 2 Boom 3 Arm 3a Hydraulic cylinder 3b Bucket link 4 Bucket 4a Projection 4b Fixed shaft 20 Hook set 21 Boss 21a Inner hole 22 Support body 23 Link pin 24 Ball bearing 24a Ball bearing outer casing 24b Screw 25 Ball bearing swivel 25a Upper shaft of hook 26 Hook 27 Detachable member 27a Pinned

Continued on the front page (72) Inventor Toshio Nishioka 1-3 Kushimachi Industrial Park, Komatsu-shi, Ishikawa Pref. Inside Muroto Ironworks Co., Ltd. (72) Inventor Toshihiko Sakashita 1-3 Kushimachi Industrial Park, Komatsu-shi, Ishikawa Pref. Muroto Co., Ltd. F term in ironworks (reference) 2D012 DA03 FA00 3F004 CB06 DA02 NA01

Claims (2)

[Claims] A bucket which is turned by hydraulic operation is provided at an end of an arm connected to a boom of a power shovel, and a hook set is attached to an outer end of the bucket.
In a power shovel capable of crane specification, two left and right protrusions are provided integrally with the upper end of a bucket rotatably attached to the arm end and connected to a hydraulic cylinder via a bucket arm. Then, a shaft is provided fixedly in the horizontal direction, a boss is rotatably supported on the fixed shaft, and provided below the bottom of the boss in the horizontal direction, in a direction perpendicular to the fixed shaft. Two support members are arranged side by side at an interval and integrally provided, and a link pin is fixedly provided through the two support members arranged in parallel and rotatably supported on the link pin. And a ball bearing swivel containing a ball bearing for supporting rotation in the vertical axis direction is provided therein, and a hook for supporting an upper shaft portion is connected to the ball bearing by the internal ball bearing. Hook set of specifications power shovel. 2. A boss portion rotatably supported on a fixed shaft provided in the upper end portion of the bucket and fixed in a horizontal direction is formed in a hollow cylindrical shape, and is provided below a bottom portion of the boss portion. The hook set for a crane-specific power shovel according to claim 1, wherein the two support members provided are each formed in a plate shape and fixed integrally.