JPH0420865Y2 - - Google Patents

Description

[Detailed description of the invention] (I)...Field of industrial application and prior art Conventionally, in various hydraulic excavators for civil engineering work, such as hydraulic tractor shovels, arms to which various types of buckets are usually attached are used. And a claw-like grip is attached to the piston rod of a hydraulic cylinder that rotates the bucket at a set angle in the same way as the bucket. It is becoming widely used for transshipment work.

The claw-like gripping tool generally opens and closes an upper claw and a lower claw, which are connected with a link mechanism, by advancing and retracting a piston rod of a hydraulic cylinder, and grasps, crushes, peels, and bends the object by the opening and closing operation. While doing so,
While holding it, carry it by operating the arm and boom, and move it to the desired location, such as on the bed of a truck.
This involves repeatedly opening the lower claw and releasing the object it has grabbed.

However, the use of the above-mentioned claw-like gripping tools is aimed at buildings, etc. at various civil engineering construction sites, etc.
The process is extremely rough, making full use of powerful hydraulic pressure, so even if the upper and lower claws are made strong to withstand it, if the link mechanism that opens and closes them is too complex, their operation will become complicated. As a result, the loss of drive energy in the link motion increases, and the number of parts also increases, making the configuration of each part fragile due to the installation space, and the possibility of failure due to the large number of parts. increase, etc.
The difference between the theoretical and the practical in the field is noticeable,
Particularly on site, if even one screw or link is damaged, the construction work must be stopped, immediately leading to large losses in time and money.

The present invention was developed in view of the above-mentioned conventional situation, in which the mechanism of conventional claw-like grips of this type has become too complicated due to the attempt to improve its theoretical working performance, which may cause failures in the field. Because of that,
In particular, the structure for opening and closing the upper and lower claws is characterized by minimizing the number of parts and making each part sufficiently durable for field work.
We have developed a claw-like grip for hydraulic excavators.

()...Structure Next, the structure of the present invention will be explained with reference to the illustrated embodiment.It is used by being attached to the piston rod of a hydraulic cylinder for various hydraulic excavators, such as the arm of a hydraulic tractor shovel and a bucket. In the claw-like grip, the rear end of the bracket 2 is detachably attached to the tip of the arm 1 with the connecting shafts 3 and 4, and the bases of the upper claw A and the lower claw B are attached to the front end of the bracket 2. are rotatably pivoted with shafts 5 and 6, respectively, and a rotating bracket 7 is located approximately in the center of the bracket 2.
The lower end of the hydraulic cylinder 9 is rotatably pivoted around a shaft 8, and the tip of the piston rod 10 of the hydraulic cylinder 9 is connected to the upper end of the rotary bracket 7 through a shaft 11. A shaft 14 and a shaft 15 are connected and installed between the approximately central portion of the bracket 7 and the bracket 12 fixed approximately at the approximately central portion of the upper surface of the upper claw A, and a shaft 11 is connected to the tip of the piston rod 10.
, a shaft 15 connecting one end of the link 13 and a shaft 8 pivotally connected to the bracket 2 are positioned apart from each other at the upper end, approximately the center, and the lower end of the rotating bracket 7, respectively. At the same time, an arm 16 is fixed to the lower end of the lower claw B at a fixed angle about the shaft 8, and an arm 17 is fixed to the base of the lower claw B at a fixed angle about the shaft 6. A link 18 is connected and installed between them with shafts 19 and 20, and the base of the upper claw A and its shaft 5, the lower end of the rotating bracket 7 and its shaft 8, and the rotating bracket 7 are connected to each other.
An arm 16 is integrated at the lower end of the lower claw B, an arm 17 is integrated at the base of the lower claw B and its shaft 6, and a link 18 is connected to the arm 16 and the arm 1.
A shaft 19 and a shaft 20 connected to each tip of the excavator 7 are provided within the area of the bracket 2, and these are covered by the bracket 2, thereby configuring the claw-like grip C of the hydraulic earth removal excavator according to the present invention. be.

()... Function The function of the present invention in the above configuration will be explained with reference to the embodiment diagrams (Figs. 1 and 2). (1) The state shown in the first diagram, that is, the upper claw A and the lower claw B. In the closed state, when the piston rod 10 of the hydraulic cylinder 9 is moved backward, the rotating bracket 7 rotates rearward about the shaft 8, thereby pulling the link 13 and causing the upper pawl A that fixed the bracket 12 to move. The arm 16 fixed to the lower end of the bracket 7 is opened by rotating upward about the shaft 5, and at the same time, the arm 16 fixed to the lower end of the bracket 7 is rotated about the shaft 8. The link 18 is rotated as shown in FIG.
Arm 1 is pulled to the base of lower claw B and fixed to the base of lower claw B.
7 rotates about the shaft 6, and the lower claw B, which is integral with the arm 17, rotates downward and opens.
(Fig. 1 → Fig. 2) (2) In addition, when the piston rod 10, which had been retracted, is moved forward, the rotating bracket 7 rotates forward about the shaft 8, and moves upward through the link 13. The claw A is rotated downward to close it, and at the same time, the arm 16 is rotated downward around the shaft 8, and the link 18 and the arm 17 are pressed down and rotated, and the arm 17 is rotated around the shaft 6. Then,
The lower claw B, which is integral with the arm 17, is rotated upward to close it. (Figure 2→Figure 1) (3) That is, the piston rod 10 of the hydraulic cylinder 9
When the piston rod 10 is moved backward, the closed upper and lower claws A and B open simultaneously, and when the piston rod 10 is moved forward,
Upper and lower claws A and B, which were open, close at the same time.

(4) Therefore, for example, attach the claw-like gripping tool C of the present invention to the arm 1 of a hydraulic tractor shovel and the piston rod 10 of the hydraulic cylinder 9 with the connecting shaft 3, the connecting shaft 4, and the shaft 11, At the site, operate the arm 1 of a hydraulic tractor shovel (not shown) to move the claw-like grip C to the object position, move the piston rod 10 backward, and open the upper and lower claws A and B. Apply it to the object, then move the piston rod 10 forward to release the upper and lower claws A and B.
It closes and grabs the object with its powerful hydraulic pressure.
Grind it, peel it off, crush it, bend it, etc., and while holding it, operate the arm to move it to the desired position.
For example, the work involves repeatedly carrying the object onto the loading platform of a truck, opening the upper and lower claws A and B, and releasing the object.

()...Effects The present invention having the above-mentioned configuration and operation has the following excellent effects.

(1) A simple mechanism consisting of two links 13 and 18 around the rotating bracket 7 is sufficient, and the rotating bracket 7 is directly connected to the piston rod 10, which is the power source, and By only rotating the movable bracket 7, the upper and lower claws A and B can be individually moved via one link 13 and 18, and therefore the parts for the rotation of each claw are The number is extremely small, and the action is performed individually for the upper claw A and lower claw B, so there is little mechanical play in the link motion etc. and loss of drive force transmission (energy loss), and the hydraulic cylinder can operate by effectively transmitting the power to the upper and lower claws.

As mentioned above, since the number of parts is small, there is sufficient installation space, and each part can be constructed strongly.

(2) In addition, the present invention does not directly connect the piston rod to the upper claw as in the past, but instead connects the piston rod to the upper claw.
0 and the upper claw A (bracket 12 of it) are connected to the rotation bracket 7 through the link 13, and the shafts 11, 15, and 8 are connected to the rotation bracket 7.
Since the upper end, approximately the center, and the lower end are positioned at a large distance from each other, when the piston rod 10 moves forward (closes), the forward pressing force of the piston rod is directly transmitted to the upper claw as in the conventional case. In contrast, in the present invention, the forward pressing force of the piston rod 10 acts on the link 13 using the shafts 8 and 15 as fulcrums, and therefore the upper claw A
It has the advantage of being able to transmit a powerful closing force amplified by the screw action (to the claw B via the arm 16, link 18, and arm 17).

(3) Furthermore, the present invention has an arm 16 integrated with the base of the upper claw A and its shaft 5, the lower end of the rotating bracket 7 and its shaft 8, and the lower end of the rotating bracket 7, which are the main parts of the mechanism. An arm 17, a link 18, and a shaft 19 and a shaft 20 that connect the link 18 to each tip of the arm 16 and the arm 17 are attached to the bracket 2.
For example, if the bracket 2 is configured with large left and right side plates attached to the tip of the arm 1, and the above-mentioned parts are installed inside the left and right side plates, This part is covered by the bracket 2, so even if it is handled roughly in the field or is hit hard by something when rotating the arm 1, it will not be easily damaged. It is possible to provide products with fewer on-site failures.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a schematic configuration of an embodiment of the proposed claw-like gripping device, and is a view showing the state in which it is attached to the arm and piston rod of a hydraulic earth removal excavator.
FIG. Code, A... Upper claw, B... Lower claw, C... Original claw-like grip, 1... Arm, 2... Bracket,
3, 4...Connection shaft, 5, 6, 8, 11, 14, 1
5, 19, 20...axis, 7...rotation bracket,
9...Hydraulic cylinder, 10...Piston rod,
12... Bracket, 13, 18... Link, 1
6,17...Arm.

Claims (1)

[Scope of Claim for Utility Model Registration] In a claw-like gripping tool that is used by being attached to the arm of a hydraulic earth removal excavator and the piston rod of a hydraulic cylinder for a bucket, the rear end of a bracket 2 is connected to the tip of an arm 1 by a connecting shaft 3. and a connecting shaft 4, and the bases of the upper claw A and the lower claw B are rotatably attached to the front end of the bracket 2 with shafts 5 and 6, respectively. Rotating bracket 7 almost in the center
The lower end of the hydraulic cylinder 9 is rotatably pivoted around a shaft 8, and the tip of the piston rod 10 of the hydraulic cylinder 9 is connected to the upper end of the rotary bracket 7 through a shaft 11. A shaft 14 and a shaft 15 are connected and installed between the approximately central portion of the bracket 7 and the bracket 12 fixed approximately at the approximately central portion of the upper surface of the upper claw A, and a shaft 11 is connected to the tip of the piston rod 10.
, a shaft 15 connecting one end of the link 13 and a shaft 8 pivotally connected to the bracket 2 are positioned apart from each other at the upper end, approximately the center, and the lower end of the rotating bracket 7, respectively. At the same time, an arm 16 is fixed to the lower end of the lower claw B at a fixed angle about the shaft 8, and an arm 17 is fixed to the base of the lower claw B at a fixed angle about the shaft 6. A link 18 is connected and installed between them with shafts 19 and 20, and the base of the upper claw A and its shaft 5, the lower end of the rotating bracket 7 and its shaft 8, and the rotating bracket 7 are connected to each other.
An arm 16 is integrated at the lower end of the lower claw B, an arm 17 is integrated at the base of the lower claw B and its shaft 6, and a link 18 is connected to the arm 16 and the arm 1.
A claw-like gripping tool for a hydraulic earth removal excavator, in which a shaft 19 and a shaft 20 connected to each tip of a shaft 7 are provided within the area of a bracket 2, and these are covered by the bracket 2.