JPH0550193U - Air shock absorber - Google Patents

Abstract

(57) [Summary] [Objective] To provide an air shock absorber having a small initial impact force, no risk of environmental pollution, and a small change in characteristics with respect to temperature. A pressure control valve 8 whose set pressure can be adjusted, a flow control valve 22 whose air discharge flow rate can be adjusted, and a pneumatic cylinder 29 which absorbs external energy are provided, and the pressure is set by the pressure control valve 8. Air is supplied to the pneumatic cylinder 29. When an external force acts on the rod 32, the air in the cylinder is discharged to the outside through the flow rate control valve 22 and the energy of the external force is absorbed, and the initial impact force is adjusted by the set air pressure and the energy absorption force is adjusted by the discharge flow rate. it can. [Effect] Since compressed air is used as the energy absorbing medium, the initial impact force is small, there is no risk of environmental pollution, and the change in characteristics with temperature is small.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air shock absorber that uses air pressure.

[0002]

[Prior Art]

 Shock absorbers using oil as the energy absorbing medium are already known, without being specifically exemplified. However, since the shock absorber using oil has a large initial impact force, it is difficult to stop a work that is easily damaged in a buffer manner. Also, if oil leaks for any reason, it contaminates the work environment, which is not preferable. Further, there is a problem that the change in characteristics due to the change in oil temperature due to the change in room temperature or the frequency of use is relatively large.

[0003]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to provide an air shock absorber having a small initial impact force, no risk of environmental pollution, and a small change in characteristics due to changes in room temperature and frequency of use. ..

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, an air shock absorber of the present invention comprises a pressure setting unit for setting the air pressure to a desired pressure, an energy absorbing unit for supplying the air whose pressure is set by the pressure setting unit, And a discharge flow rate control unit for controlling the discharge amount of air from the energy absorbing unit. In order to solve the same problem, the pressure setting unit is a pressure control valve that can adjust the set pressure, the energy absorbing unit is a pneumatic cylinder, and the discharge flow rate control unit is a flow rate control valve that can adjust the discharge flow rate. Is characterized by.

[0005]

When the external energy acts on the energy absorbing section, the compressed air having a desired pressure in the energy absorbing section is discharged to the outside with the flow rate controlled by the discharge flow rate controlling section, whereby the external energy is absorbed. In this case, since the energy absorbing medium is air having compressibility, the initial impact force can be made smaller than that of oil, and furthermore, the initial impact force can be adjusted by the air pressure in the energy absorbing portion. Also, the absorption of external energy can be adjusted by adjusting the flow rate of the air discharged to the outside. Further, since no oil is used, not only the work environment is not contaminated due to oil leakage, but also changes in characteristics due to temperature fluctuations can be reduced.

[0006]

【Example】

 FIG. 1 shows a first embodiment of the present invention, in which an air shock absorber 1 includes a pressure setting unit 2 for setting an air pressure to a desired pressure and a discharge for controlling an air discharge amount to a desired amount. A flow rate control unit 3 and an energy absorption unit 4 to which air is supplied from the pressure setting unit 2 are provided, and each of these units is installed in a body 5.

The pressure setting unit 2 is composed of a known pressure control valve 8 that sets the pressure of compressed air supplied from a port 6 opened in the body 5 to a desired pressure by rotating the handle 9. The pressure control valve 8 includes a supply valve seat 11 in a flow passage that connects the port 6 and a passage 10 provided in the body 5, and a discharge valve in a flow passage that connects the passage 10 and a discharge port (not shown). The seat 12, the feedback chamber 13 to which the air in the passage 10 is fed back, the pressure adjusting chamber 14 that is open to the outside, the diaphragm 15 that divides these chambers 13 and 14, and the pressure adjusting chamber 14 that is compressed. The pressure spring 16 is provided, and the biasing force of the pressure adjusting spring 16 can be adjusted by rotating the handle 9. Further, the supply valve body 17 that opens and closes the supply valve seat 11 is urged by the valve spring in the direction of closing the supply valve seat 11, and the tip of the valve rod 19 that drives the supply valve body 17 is installed in the diaphragm shell. A discharge valve body 20 that opens and closes the discharge valve seat 12 is formed.

On the other hand, the discharge flow rate control unit 3 is composed of a flow rate control valve 22 provided between the passages 10 and 21 of the body 5, and the flow rate control valve 22 only allows the air to flow from the passages 10 to 21. The check valve 23 is allowed, a bypass passage 24 of the check valve, and a needle valve 25 in the bypass passage are provided, and the opening degree of the needle valve 25 can be adjusted by a handle 26. The energy absorbing portion 4 is composed of a cylinder 30 formed in the body 5 and a pneumatic cylinder 29 having a piston 31 and a rod 32 that slide in the cylinder, and the passage 21 has a pressure on the head side. It opens into the chamber 34.

In the first embodiment, when the compressed air is not supplied to the pressure chamber 34, the supply valve body 17 is pressed by the valve rod 19 which works downward in the figure by the urging force of the pressure adjusting spring 16. Since the supply valve seat 11 is opened, the compressed air supplied from the port 6 flows into the pressure chamber 34 through the supply valve seat 11, the passage 10, the check valve 23 of the flow control valve 22, and the passage 21. .. When the air pressure of the feedback chamber 13 rises due to the rise of the air pressure of the pressure chamber 34, and the acting force thereof becomes equal to the set biasing force of the pressure adjusting spring 16, the supply valve body 17 and the discharge valve body 20 discharge the supply valve seat 11 and the discharge valve body 11. With the valve seat 12 closed together, the air pressure in the pressure chamber 34 of the pneumatic cylinder 29 is set to the desired pressure determined by the biasing force of the pressure regulating spring 16, which air pressure can be adjusted by the rotation of the handle 9. ..

FIG. 1 shows a state in which air having a desired pressure is supplied to the pressure chamber 34. In this state, when an external force F acts on the rod 32 of the pneumatic cylinder 29, the rod 32 and the piston 31 are moved in the figure. Sliding to the left, the air in the pressure chamber 34 passes through the needle valve 25 of the flow control valve 22 and flows into the feedback chamber 13 of the pressure control valve 8. As a result, the air pressure in the feedback chamber 13 rises and the diaphragm 15 moves upward in the figure, so that the discharge valve body 20 opens the discharge valve seat 12 and the air in the pressure chamber 34 is gradually discharged to the outside. Therefore, the energy of the external force F can be absorbed by the pneumatic cylinder 29. In this case, since the compressive air is used as the energy absorbing medium, the initial impact force can be reduced, so that even a workpiece that is easily damaged by a small impact force can be stopped in a buffered manner without damaging the supply. The initial impact force can be adjusted by adjusting the air pressure. Further, since oil is not used, the work environment is not polluted by oil leakage, and the external energy absorption force by the pneumatic cylinder 29 can be adjusted by adjusting the opening degree of the needle valve 25 with the handle 26.

When the acting force of the air pressure acting on the piston 31 becomes larger than the external force F, the piston 31 and the rod 32 move to the right in the figure, and the desired compressed air is supplied to the pressure chamber 34 to prepare for the next external force. Although not shown, if a pipe is connected to the discharge port of the pressure control valve 8 so that air is not directly discharged into the working environment, it can be used in a clean room.

FIG. 2 shows an experimental example in which the air pressures supplied to the energy absorbing section 4 (pressure chamber 34) are 3 kgf / cm ² and 5 kgf / cm ^2, and as shown in FIG. The pressure increase in the pressure chamber 34 can be adjusted by adjusting the opening degree.

FIG. 3 shows a second embodiment of the present invention, in which the pressure control valve 41 in the air shock absorber 40 is configured as a known pilot type pressure control valve having a pilot valve 42. The compressed air supplied to the inlet port 43 is set to a desired pressure by the set urging force of the pressure adjusting screw 44, and this pilot air is supplied to the pilot chamber 46 of the main valve 45. The pressure receiving piston 47 provided in the main valve 45 divides the pilot chamber 46 from the feedback chamber 13, and the supply valve body 17 and the discharge valve body 17 are discharged depending on the magnitude of the pilot fluid pressure and the feedback fluid pressure which are opposed to the pressure receiving piston 47. The valve body 20 opens and closes the supply valve seat 11 and the discharge valve seat 12, and the air pressure in the pressure chamber 34 is set to a desired pressure determined by the set biasing force of the pressure adjusting screw 44. Since the other structure and operation of the second embodiment are the same as those of the first embodiment, the same reference numerals are given to the main parts in the drawing, and the detailed description will be omitted.

FIG. 4 shows a third embodiment of the present invention. In this air shock absorber 50, a body 51 has a discharge passage 53 communicating with a discharge port R of a pressure control valve 52 and a port at the tip of the discharge passage 53. 54, and the pressure control valve 52 is a well-known precision pressure control valve. Since the other structure and operation of the third embodiment are the same as those of the first embodiment, the same reference numerals are given to the main parts in the drawing, and the detailed description will be omitted.

FIG. 5 shows a fourth embodiment of the present invention. In this air shock absorber 60, a body 61 has a discharge flow path 62 communicating with a discharge port R of a pressure control valve 52 and a port at the end of the flow path. 63, and the flow rate control valve 22 is installed in the discharge flow path 62. Since the other structure and operation of the fourth embodiment are the same as those of the third embodiment, the same reference numerals are given to the main parts in the drawing, and the detailed description will be omitted. Although not shown, in the third and fourth embodiments, air exhaust pipes can be connected to the ports 54 and 63.

[0016]

[Effect of the device]

 Since the air shock absorber of the present invention can reduce the initial impact force by using compressed air as the energy absorbing medium, even a work or the like that is weak against impact can be stopped without damaging it. Further, since oil is not used as the energy absorbing medium, not only can environmental pollution due to oil leakage be prevented, but also changes in characteristics due to room temperature fluctuations, frequency of use, etc. can be made smaller than with oil. Furthermore, the initial impact force and the external energy absorption force can be set to arbitrary values by adjusting the supply air pressure and the exhaust air amount.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment.

FIG. 2 is a diagram showing a relationship between an opening of a throttle and a pressure increase in a pressure chamber during a cushion stroke.

FIG. 3 is a vertical sectional view of a second embodiment.

FIG. 4 is a vertical sectional view of a third embodiment.

FIG. 5 is a vertical sectional view of a fourth embodiment.

[Explanation of symbols]

 1, 40, 50, 60 Air shock absorber 2 Pressure setting unit 3 Discharge flow rate control unit 4 Energy absorption unit 8, 41, 52 Pressure control valve 22 Flow rate control valve 29 Pneumatic cylinder

Claims (2)

[Scope of utility model registration request] 1. A pressure setting unit for setting an air pressure to a desired pressure, an energy absorbing unit to which the air whose pressure is set by the pressure setting unit is supplied, and an air discharge amount of the energy absorbing unit are controlled. An air shock absorber, comprising: 2. The pressure setting unit is a pressure control valve capable of adjusting a set pressure, the energy absorbing unit is a pneumatic cylinder, and the discharge flow rate control unit is a flow rate control valve capable of adjusting a discharge flow rate. The air shock absorber according to claim 1.