JPH0448915Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a shock absorbing device for absorbing the impact when the rotation of the table is stopped by impact in various machines equipped with a rotary swing table.

[Conventional technology]

For example, as shown in FIGS. 4 and 5, a stopper 3 is fixed to the lower surface of the table 2 as a means for reciprocating and swinging the table 2 that rotates around the rotation axis 1 within a predetermined angle θ. A pair of absorbers 4, 4 are provided at both swing limit positions of the stopper 3.
is installed, and the stopper 3 is connected to the absorber 4.
It is known that the absorber 4 stops the collision and absorbs the impact at the time of the collision. 6th
The figure shows an example of this absorber 4 on an enlarged scale, and shows that the backward movement of the rod 5 that collides with the stopper 3 is caused by the movement of the oil 7 sealed in the main body 6 and the spring 8.
It is constructed so that it can be received with the elasticity of

[Problem to be solved by the invention] In the above device, the absorber 4 can be said to be a very effective means for absorbing the shock when stopped, but the restoring force of the spring 8 is mainly used to return the rod 5. Since the rod 5 is used, a force f always acts to return the rod 5 after the collision stops. Therefore, when the force T that tries to rotate the table 2 is removed, the rod 5 moves back by the spring 8 and pushes the table 2 back by the amount θ' of the return movement, as shown in FIG. , there is a problem that the table 2 cannot be stopped at an accurate position.

[Means for solving problems]

In view of the above points, the purpose of the present invention is to stop the table at an accurate position without pushing it back. The shock absorbing device includes a pair of hydraulic cylinders at both swing limit positions of the stopper, the head sides of the two hydraulic cylinders are connected to each other by piping, and a throttle valve is provided in the piping. This is what we provide.

[Effect]

The shock absorbing device with the above structure causes oil to flow mutually between a pair of hydraulic cylinders installed at both swing limits of a stopper of a rotary swing table, and the throttling action of a throttle valve installed in a communicating pipe acts as a flow resistance to create an impact. It absorbs the shock when it comes into contact with the rod, and is characterized by eliminating the element that moves the rod back like the conventional spring.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a pair of hydraulic cylinders 9, 9 are connected to fixed plates 10, 10 and lock nuts 11, 11 at both swing limit positions of a stopper 3 fixed to the lower surface of the rotary swing table 2. The head sides (cylinder chambers) of both hydraulic cylinders 9, 9 are connected to each other by a communicating pipe 12, and a throttle valve 13 that can vary the amount of throttle is installed in the middle of the pipe 12. . Oil 14 is injected and filled into both hydraulic cylinders 9, 9, and is connected to the piston rod 15 of one cylinder 9 via a communication pipe 12.
When the piston rod 15 of the other cylinder 9 is pushed in, the piston rod 15 of the other cylinder 9 protrudes.

The shock absorbing device having the above structure has a piston rod 1
Table 2 is attached to one hydraulic cylinder 9 from which 5 is protruded.
The stopper 3 of the cylinder 9 collides with the other cylinder 9, and the impact at the time of collision is effectively absorbed by the throttling action of the throttle valve 13 on the oil 14 flowing from the cylinder 9 to the other cylinder 9. You can adjust the amount of shock absorption by adjusting the amount of aperture. As the piston rod 15 of the former cylinder 9 is pushed in by the collision, the piston rod 15 of the latter cylinder 9 is pushed out, preparing for the next collision with the stopper 3 that swings back and forth.

FIG. 3 shows a second embodiment of the present invention, which is equipped with a circuit for replenishing oil 14 in case it leaks. Connect through oil 1
The on-off valve 18 is configured to be opened only when replenishment of 4 is necessary.

[Effect of idea]

As explained above, the shock absorbing device of the present invention has the following features:
The head sides of a pair of hydraulic cylinders are communicated with each other, and a throttle valve is provided in the communication pipe, and the throttle valve's throttling action is used to absorb shock. It operates like a seesaw, and when the stopper of the table collides with one hydraulic cylinder, it causes the piston rod of the other cylinder to return to its original position. Problems can be resolved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a shock absorbing device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the same operation, Fig. 3 is a piping diagram according to another embodiment, and Fig. 4 is a side view of a conventional example. , FIG. 5 and FIG. 7 are the same plan views, and FIG. 6 is a sectional view of the absorber. 1...rotating axis, 2...rotating swing table, 3...
...stopper, 4...absorber, 5...rod,
6...Absorber body, 7, 14...Oil, 8
... Spring, 9 ... Hydraulic cylinder, 10 ...
Fixed plate, 11... Lock nut, 12...
Communication pipe, 13... Throttle valve, 15... Piston rod, 16... Hydraulic pressure source, 17... Check valve, 18...
...Open/close valve.

Claims (1)

[Scope of utility model registration request] In a device for absorbing shock when stopping the rotation of the table 2 by colliding with the stopper 3 of the rotary swing table 2, a pair of hydraulic cylinders 9, 9 are provided at both swing limit positions of the stopper 3. Piping 1 connects the head sides of the hydraulic cylinders 9 and 9 with each other.
2. A shock absorbing device characterized in that the piping 12 is provided with a throttle valve 13.