JP2000130407A - Fluid control type shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid control type shock absorber which can be attached in the same manner as the conventional shock absorber, has a simple structure, can control at the time of high speed, has no rebound by adjusting pressure by a needle and can be attached to almost fluid operated cylinder. SOLUTION: Although discharge fluid is entered from the outflow/inflow hole 10 of a cylinder 1 to a slit part 7, a rod 2 is moved in an external force direction 14 by receiving external force and stopped by a stopper part 8, therefore, shock at the time of stopping can be reduced by temporarily stopping discharge fluid of a fluid operated cylinder. When pressure is increased and there is a possibility of rebound, fluid can be released from a bypass hole 12 by adjusting a needle 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention is an apparatus for alleviating the impact of a hydraulic cylinder, which controls the reciprocating / rotating motion of an industrial machine, when the cylinder is stopped.

[0002] A conventional shock absorber is a device that combines a spring and oil outside a fluid-operated cylinder and absorbs an impact by friction of the oil. This is disadvantageous in that selection is difficult depending on the speed and force of the fluid-operated cylinder, stopping time is required when an absorber having a large force is selected, stopping holding force is reduced, and the device is damaged by prolonged use. Some fluid-actuated cylinders have a shock absorber device inside, but the mechanism is complicated and is limited to only a limited number of fluid-actuated cylinders. It cannot be used when it is necessary to stop at other times. There is also a method of using a solenoid valve for switching between high-speed and high-pressure and low-speed and low-pressure, and performing two-pressure control by checking the timing with a cylinder sensor or the like, but the piping wiring becomes complicated and a sensor is required. It becomes expensive because two pressure regulators are used.

The fluid control type shock absorber of the present invention does not control and mitigate the impact by the machine itself. The fluid control type shock absorber of the present invention is provided outside a fluid working cylinder, and the fluid is controlled by the cylinder and rod. The purpose is to control the fluid in the working cylinder itself to reduce the stop impact. The machine itself does not reduce the impact, so it can be used for a long time, shorten the stop time, do not change the stop holding force, there is no rebound, it can be installed on any fluid working cylinder It was devised as follows. In addition, the product has a simple structure, has few obstacles such as failures, and does not require a sensor, a solenoid valve, or a pressure regulator.

According to the present invention, a shock absorber is installed at the end of a fluid working cylinder in the same manner as a conventional shock absorber, and the outflow and inflow fluid is controlled just before the stopping of the fluid working cylinder to reduce the impact. In addition, there are outflow side control and inflow side control as the control direction of the fluid. In the present invention, either direction may be used depending on the piping direction, but only one of the outflow side control will be described. or,
It is desirable to use a conventional speed controller for speed adjustment. Bypass hole 11 and valve 4 in cylinder 1
And a holding spring 5 are provided. Also, the bypass hole 12
Is provided with a threaded needle 13 so that it can be adjusted. Further, the rod 2 is provided with cut portions 6 and 7 and a stopper portion 8 to control the fluid flowing out and in through the outflow and inflow holes 9 and 10. Further, the cylinder 1 is provided with stoppers 16 and 3 for the rod 2 and a spring 15 for return.

There are outflow side control and inflow side control as a fluid control method, and the outflow side control method will be described with reference to FIG. The fluid operated cylinder 2 is switched by switching the solenoid valve 21.
0 in the left and right direction, and the fluid control type absorber 18
And 19 describe how the fluid-operated cylinder 20 is controlled. Assuming that the fluid comes out of the fluid outflow / inlet hole 23 of the solenoid valve 21, when the fluid enters the cylinder 20 via the fluid control type shock absorber 19, it moves to the fluid control type shock absorber 18 side. In FIG. 2, when the push plate 24 of the fluid working cylinder 20 is not applied to the rod 2 of the fluid control type shock absorber 18 by an external force as the external pressure direction 14, the rod 2 is fixed by the stopper 3 and the return spring 15. The outflow fluid of the fluid working cylinder 20 is cut into the notch 6 of the rod 2 through the inflow hole 10,
It returns to the solenoid valve 21 through the fluid outflow / inlet hole 22 of the solenoid valve 21 through the outflow / inlet hole 9, and the fluid working cylinder 20 can continue to move smoothly. In FIG. 3, when the push plate 24 of the fluid working cylinder 20 is applied to the rod 2 of the fluid control type shock absorber 18 by an external force in the external pressure direction 14, the rod 2 moves and the outflow fluid of the fluid working cylinder 20 is It has entered the outflow / inflow hole 10, but is stopped by the stopper portion 8.
Then, the internal pressure of the fluid working cylinder 20 increases and the movement is controlled. If the internal pressure is too high, a bouncing phenomenon will occur. In this case, the needle 13 is adjusted and slightly opened to allow fluid to escape from the bypass hole 12 to adjust the bouncing phenomenon. In FIG. 4, when the fluid-operated cylinder 20 reaches the end of the lot, the fluid control type shock absorber 18 is so arranged that the rod 2 of the cylinder 1 strikes the stobber 16 with an external force in the external pressure direction 14 without difficulty.
Is adjusted, the outflow fluid passes through the outflow / inlet hole 10, passes through the cutout portion 7, outgoes through the outflow / inlet hole 9, and enters the solenoid valve 21 through the fluid outflow / inlet hole 22, whereby the fluid working cylinder 20 The force at the time of stop is maintained. In FIG. 5, when the solenoid valve 21 is switched and fluid flows out of the fluid inflow / outflow hole 22, the fluid working cylinder 20 starts to return. Accordingly, the fluid control type shock absorber 18 starts moving in the return direction 17 by the spring 15. The fluid can enter through the inflow / outflow hole 9 of the cylinder 1, pass through the cutout portion 7, and exit through the inflow / outflow hole 10. FIG.
In this case, when the spring 15 starts to return in the return direction 17 due to the force of the spring 15, the fluid that has entered through the inflow / outflow hole 9 is stopped by the stopper portion 8. At this time, the fluid working cylinder 20 stops and the internal pressure rises, so that the fluid flows from the bypass hole 11 and pushes down the valp 4 held by the spring 5 to pass through the outflow / inlet hole 10. You can move without. In FIG. 7, the rod 2 of the cylinder 1 has a return spring 15
When it returns, the stopper 3 returns to the original state, and the fluid enters through the cut-out portion 6 through the flow-in / out hole 9 and flows out / in the hole 1.
It becomes possible to escape from zero, and the fluid working cylinder 20 can continue to move smoothly. By switching the solenoid valve 21, fluid flows in and out of the fluid outflow / inflow holes 22 and 23, whereby the fluid working cylinder 20 is moved in the left-right direction, and the fluid control type shock absorber 1 is moved.
Numerals 8 and 19 control and mitigate the impact of the fluid working cylinder 20 by repeating the above movement.

The present invention is simple because it can be installed in the same manner as conventional shock absorber handling, and can also be used for stopping other than at the rod end, and can be installed on most fluid-operated cylinders. It can be used widely. Since the structure is simple and the present invention itself does not alleviate the impact and controls the fluid-operated cylinder, there is little fear of breakage and failure and the durability is excellent. A needle is provided to eliminate rebound due to an increase in internal pressure at the time of stop, and the pressure at stop can be adjusted by adjusting the needle. By adjusting the needle, the stopping distance can be adjusted, and the stop holding force does not change. Therefore, one fluid-control shock absorber of the present invention can be used for a wide range of fluid-operated cylinders. Sensors, solenoid valves,
There is no need for a pressure regulator, etc., the piping and wiring are simple, and the device can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a piping diagram of a fluid control type shock absorber, a fluid working cylinder, and a solenoid valve.

FIG. 2 is a cross-sectional view of a fluid control type shock absorber,
The spring is not a sectional view.

FIG. 3 is a sectional view of a fluid control type shock absorber,
The spring is not a sectional view.

FIG. 4 is a sectional view of a fluid control type shock absorber,
The spring is not a sectional view.

FIG. 5 is a sectional view of a fluid control type shock absorber,
The spring is not a sectional view.

FIG. 6 is a sectional view of a fluid control type shock absorber,
The spring is not a sectional view.

FIG. 7 is a sectional view of a fluid control type shock absorber,
The spring is not a sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Rod 3 Stopper 4 Valve 5 Spring 6 Cut part 7 Cut part 8 Stopper part 9 Outflow / inlet hole 10 Outflow / inlet hole 11 Bypass hole 12 Bypass hole 13 Needle 14 External pressure direction 15 Spring 16 Stopper 17 Return direction 18 Fluid control shock Absorber 19 Fluid control type shock absorber 20 Fluid operated cylinder 21 Solenoid valve 22 Fluid outflow / inflow hole 23 Fluid outflow / inflow hole 24 Push plate

Claims (3)

[Claims] An inflow / outflow hole (9, 10) is provided in a cylinder (1), and notches (6, 7) and a stopper (8) are provided in a rod (2).
A fluid control type shock absorber that controls the fluid working cylinder 20 by moving the rod 2 when receiving a force from the external pressure direction 14 and moving in the return direction 17 by a spring 15. 2. When the fluid flowing from the outflow / inflow hole 9 of the cylinder 1 does not flow through the outflow / inflow hole 10 due to the positions of the cut portions 6, 7 and the stopper portion 8 of the rod 2,
1. A fluid control type shock absorber which controls a fluid working cylinder 20 by pushing down a valve 4 held by a spring 5 so as to allow the fluid to flow out from an inflow / outflow hole 10 without breathing. 3. When the fluid flowing in and out of the inflow and outflow holes 9 and 10 of the cylinder 1 does not flow due to the position of the outflow and inflow stopper 8 of the rod 2, the internal pressure of the fluid working cylinder 20 increases and is controlled. The shock is reduced, but if the internal pressure is too high, it may rebound. Therefore, by adjusting the thread of the threaded needle 13, the fluid escapes from the bypass hole 12 to control the fluid working cylinder 20. Control type shock absorber.