JPH037116Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air pressure adjustment device for adjusting the pressure of compressed air used in a balancer, die cut, etc. of a press machine.

[Conventional technology]

Conventionally, press machine balancers, ducts, etc. have been equipped with a large-capacity air tank that is connected to a pneumatic actuator and stores compressed air so that the shock generated during press operation can be absorbed by utilizing the compressibility of air. As shown in FIG. 4, the air pressure adjustment device for compressed air to be filled in the press is connected to a large capacity air tank 7 and a pressure source 1, which are connected to a pneumatic cylinder 2 as a pneumatic actuator that receives shocks generated during press operation. In distribution path 3,
A pressure regulating valve 5 and a check valve 6 are connected in series to control the pressure reduction of the compressed air from the pressure source 1 side by freely setting the operating pressure by adjusting the pressure of the pilot compressed air with the pilot valve 4 from the pressure source 1 side. A branch passage 8 is arranged and branched from the flow passage 3 on the outlet side of the check valve 6.
In addition, the pressure is adjusted by the pilot valve 4 and the switching valve 10 which allows the compressed air to flow in both directions through the branch passage 8 or prevents the flow of compressed air from the branch side by switching the pilot switching valve 9 from the branch side. Air pressure of pilot compressed air and branch path 8
An exhaust valve 11 is disposed in series, which operates based on the pressure difference between the compressed air and the air pressure of the pneumatic cylinder 2 to exhaust the compressed air from the pneumatic cylinder 2 to the outside. and,
The air pressure on the pneumatic cylinder 2 side can be set by adjusting the air pressure of pilot compressed air to a desired value using a pilot valve 4.

[Problem that the invention attempts to solve]

However, during normal press operation, the pneumatic cylinder 2 receives an impact caused by the press operation, and the compressed air in the pneumatic cylinder 2 and the air tank 7 is compressed to absorb the impact and temporarily rises above the set pressure. Branch road 8 by 10
The flow of compressed air from the branch side to the exhaust valve 11 side is blocked to prevent the exhaust valve 11 from exhausting the compressed air on the pneumatic cylinder 2 side to the outside, so that the air pressure on the pneumatic cylinder 2 side is already reduced. When the pressure drops below the set pressure, the air pressure of the pilot compressed air is adjusted to a desired low pressure using the pilot valve 4, and the switching valve 10 is operated to allow the compressed air to flow in both directions through the branch passage 8, and then from the exhaust valve 11. The compressed air from the pneumatic cylinder 2 side must be exhausted to the outside, which poses a problem in that valve operations are complicated and erroneous operations are likely to occur.

The present invention solves such problems and provides an air pressure regulating device that prevents a temporary increase in air pressure on the pneumatic actuator side from affecting the exhaust valve without requiring complicated valve operations. It is something.

[Means for solving problems]

The structure of the present invention, which was created to solve this problem, is equipped with a pressure regulating valve whose operating pressure can be freely set by adjusting the pressure of the pilot compressed air to control the pressure reduction of the compressed air from the pressure source side. , a flow passage is connected to the outlet side of the pressure regulating valve to allow the compressed air under reduced pressure to flow out to the pneumatic actuator side via the check valve; An exhaust valve is provided to exhaust compressed air to the outside, and the exhaust valve introduces the pilot compressed air of the pressure regulating valve and attaches a valve body that opens and closes between the flow path and the exhaust path using the acting force of the air pressure in the closing direction. An action chamber formed to introduce compressed air in opposition to the pilot compressed air is connected to the flow passage on the outlet side of the check valve by a pilot passage, and a pneumatic actuator is actuated in the pilot passage of the exhaust valve. In order to prevent the air pressure in the exhaust valve action chamber from increasing as a result of the temporary increase in air pressure on the pneumatic actuator side, air pressure absorbing means is provided to temporarily absorb the increased air pressure on the pneumatic actuator side. Features.

[Effect]

In such a configuration of the present invention, when the air pressure of the pilot compressed air of the pressure regulating valve is adjusted upward,
The reduced pressure controlled compressed air flowing out into the flow path is changed to a high air pressure, and the exhaust valve remains in the closed operating state. In addition, when the air pressure of the pilot compressed air of the pressure regulating valve is adjusted downward, the pressure reduction control compressed air flowing out into the flow path is changed to a lower air pressure.
The exhaust valve is opened by the action force of the air pressure in the action chamber to exhaust the compressed air from the pneumatic actuator side and lower the air pressure. It closes due to the force exerted by pressure. and,
When the air pressure on the pneumatic actuator side is set to the air pressure of the pilot compressed air of the pressure regulating valve, and the air pressure on the pneumatic actuator side increases temporarily due to operation of the pneumatic actuator, the increased air pressure will be applied to the exhaust valve. Attempts are made to introduce the air into the action chamber through the pilot passage, but the pressure is temporarily absorbed by the air pressure absorbing means provided in the pilot passage, and while the increased air pressure is being absorbed, the pneumatic actuator returns to normal operation and the pneumatic actuator Since the air pressure on the side returns to the air pressure before the rise, the air pressure in the action chamber of the exhaust valve does not rise following the temporary rise in air pressure on the pneumatic actuator side, and the exhaust valve remains in the closed operating state. It remains as it is.

Therefore, it is possible to effectively prevent a temporary increase in air pressure on the pneumatic actuator side from affecting the exhaust valve without requiring complicated valve operations.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 to 3, reference numeral 12 denotes a pilot-operated pressure regulating valve, which is provided so that the operating pressure can be freely set by adjusting the pressure of the pilot compressed air by the pilot valve 13, thereby controlling the pressure reduction of the compressed air. Reference numeral 14 denotes a valve body of the pressure regulating valve 12, which has an inlet passage 15 and an outlet passage 16, a valve seat 17 is formed between the inlet passage 15 and the outlet passage 16, and a valve body 18 that can be freely attached to and detached from the valve seat 17. It is equipped with. 19 is the valve body 18
20 is a rod member fixed to the valve body 18, and the upper part is attached to the valve body 1.
4 in a fluid-tight manner and protrudes above the valve body 14. Reference numeral 21 denotes an operating section main body mounted on the upper part of the valve main body 14, and a lid member 23 is fixedly installed with an intermediate member 22 interposed therebetween to form a space inside, and the upper part of the rod member 20 is located in the inner space. Then, the operation unit main body 2
Diaphragms 24 and 25 are sandwiched between 1 and the intermediate member 22 and between the intermediate member 22 and the second lid member 23, respectively, and the internal space is divided into a first working chamber 26, a second working chamber 27, and a third working chamber. The working chamber 26 is connected to the outlet passage 16 of the valve body 14, the working chamber 27 is opened to the outside, and the working chamber 28 is connected to the outlet side of the pilot valve 13. diaphragm 2
4 and 25 are threaded members 30 with spacers 29 interposed therebetween.
The spacer 29 and the screw member 30 are provided with a passage communicating between the working chambers 26 and 27, and the rod member 20 abuts against the screw member 30 to close the passage. 31 is pressure regulating valve 1
2 is a pressure source connected to the inlet passage 15; 32 is a pressure gauge installed on the outlet side of the pilot valve 13 to detect the air pressure of the pilot compressed air; 33 is a pneumatic cylinder serving as a pneumatic actuator; It is designed to operate downward. 34 is a large capacity air tank connected to the pneumatic cylinder 17, and the pressure regulating valve 12 is
It is connected to the outlet passage 16 of the. A check valve 36 is provided in the flow path 35 to allow compressed air to flow from the pressure regulating valve 12 to the pneumatic cylinder 33 side. Reference numeral 37 designates an exhaust valve that exhausts the compressed air from the pneumatic cylinder 33 side to the outside, and has a flow passage 35, a branch passage 38 branching from the outlet side of the check valve 36 provided in the flow passage 35, and an exhaust passage 39 open to the atmosphere. A valve seat 40 is provided between the branch passage 38 and the exhaust passage 39.
A valve body 41 is provided, and a lid member 43 is fixed to the upper part of the valve body 41 with an operating part main body 42 interposed therebetween, and a space is formed inside the operating part main body 42 and the lid member 43. A diaphragm 44 is sandwiched between the operating section main body 42 and the lid member 43 to divide the internal space into a first working chamber 45 and a second working chamber 46 . Reference numeral 47 denotes a valve body which is detachably provided on the valve seat 40 of the valve body 41, and whose upper portion protrudes through the intermediate member 42 in an airtight manner and is fixed to the diaphragm 44.
The action chamber 45 is connected to the check valve 3 by a pilot passage 48.
6 is connected to the flow path 35 on the outlet side, and the action chamber 46 has a spring 4 that urges the valve body 47 in the direction of seating on the valve seat 40.
9 and connects the pilot valve 13 through the connection path 50.
Connected to the exit side. 51 is a pneumatic pressure so that the air pressure in the working chamber 45 does not increase accordingly when the pneumatic cylinder 33 moves downward due to the impact generated by the press operation and the compressed air on the pneumatic cylinder 33 side temporarily rises above the set pressure. An air pressure absorbing means for temporarily absorbing the rising air pressure on the actuator 33 side, which sequentially operates from the flow passage 35 side of the pilot passage 48 to the first flow rate regulating valve 52, the air tank 53 for accumulating compressed air, and the second flow rate. Adjustment valve 54
The first flow rate adjustment valve 52 and the second flow rate adjustment valve 54 each include throttle valves 55, 56 and check valves 57, 5 whose throttle opening degree can be freely adjusted.
8 are arranged in parallel to control the flow of compressed air from the flow path 35 side to the action chamber 45 side, and to make the flow in the opposite direction a free flow. The air pressure absorbing means 51 is a throttle valve 55 of the first flow rate regulating valve 52.
The throttle opening ratio of the throttle valve 54 of the second flow rate regulating valve 54 is adjusted so that the absorption time of the rising air pressure is longer than the air pressure rising time on the pneumatic cylinder 33 side.

Next, the operation of this configuration will be explained.

1 to 3 show a state in which the pressure regulating valve 12 controls the pressure reduction of compressed air from the pressure source 31, and the pneumatic cylinder 33 and the air tank 34 are filled with compressed air set to a set pressure. In the pressure regulating valve 12, the air pressure acting oppositely on the diaphragms 24 and 25 is equal, and the valve body 18 is seated on the valve seat 17 by the spring force of the spring 19. Since the air pressures are equal, the valve body 47 is closed by the spring force of the spring 49 and is seated on the valve seat 40.

In the illustrated state, when the pilot compressed air is adjusted upward to a desired value by operating the pilot valve 13, the elevated pilot compressed air is introduced into the working chamber 28 of the pressure regulating valve 12, and the pressure regulating valve 12 increases the operating pressure. is raised to change the pressure reduction control compressed air flowing out into the flow path 35 to a desired value of air pressure. Then, the working chamber 46 of the exhaust valve 37 is connected via the connecting path 50.
The pilot compressed air raised in the flow path 35 is introduced, and the exhaust valve 37 acts on the valve body 47 with an increased force in the direction of closing operation, and remains in the closed operation state, and the compressed air changed in the flow passage 35 is introduced into the exhaust valve 37. The air tank 5 is controlled to be compressed by the first flow rate regulating valve 52 from the passage 48.
3 and is further throttled and controlled by the second flow rate regulating valve 54 and introduced into the action chamber 45, and the air pressure in the action chamber 45 becomes in accordance with the increased air pressure in the trailing passage 35 for a certain period of time. . Therefore, the air pressure on the pneumatic cylinder 33 side is quickly set to a desired value. Also, from the illustrated state, the pilot valve 1
3 to lower the pilot compressed air to a desired value, the pressure regulating valve 12 lowers the air pressure of the pilot compressed air introduced into the working chamber 31, lowers the operating pressure, and flows out into the flow path 35. The compressed air under pressure reduction control is changed to a desired value of air pressure. Then, since the air pressure of the pilot compressed air introduced into the action chamber 46 of the exhaust valve 37 through the connection path 50 decreases, the exhaust valve 37 creates an action chamber that acts on the diaphragm 44 in opposition to the air pressure of the pilot compressed air. The valve element 47 is urged in the opening direction by the force exerted by the air pressure of the cylinder 45, and is separated from the valve seat 40, and the compressed air on the pneumatic cylinder 33 side is discharged to the outside by the exhaust valve 37 via the flow path 35 and the branch path 38. is exhausted. As the air pressure in the flow passage 35 decreases due to the exhaust action, the action chamber 45 of the exhaust valve 37
The compressed air flows through the check valve 5 of the second flow rate regulating valve 54.
8. The air is rapidly flowed out to the flow path 35 through the air tank 53 and the check valve 57 of the first flow rate adjustment valve 52, and the air pressure in the action chamber 45 is adjusted to correspond to the air pressure changed downward in the flow path 35. Pressure controlled. As the air pressure in the working chamber 45 decreases, the exhaust valve 37 closes due to the acting force of the pilot compressed air in the working chamber 46 and the spring force of the spring 49, and stops exhausting the compressed air from the pneumatic cylinder 33 side. . Therefore, the air pressure on the pneumatic cylinder 33 side drops from the preset pressure and is quickly set to the desired value. Furthermore, in the illustrated state, if the pneumatic cylinder 33 receives an impact caused by the press operation and the compressed air in the pneumatic cylinder 33 and the air tank 34 is compressed and temporarily rises above the set pressure, the increased air pressure is Distribution path 35, pilot path 48
However, the compressed air on the pneumatic cylinder 33 side is controlled to be condensed by the first flow rate regulating valve 52 constituting the air pressure absorbing means 51 and accumulated in the air tank 53. Since the second flow rate regulating valve 54 performs constriction control, the pressure is temporarily absorbed. Then, while the increased air pressure is absorbed by the air pressure absorbing means 51, the impact generated by the press operation is released and the air pressure on the pneumatic cylinder 33 side returns to the set pressure before the increase, so the air tank 53 The rising air pressure accumulated in the first flow rate regulating valve 52
The air pressure in the action chamber 45 of the exhaust valve 37 does not rise following the temporary increase in the air pressure on the pneumatic cylinder 33 side, and the air pressure in the action chamber 45 of the exhaust valve 37 does not increase due to the temporary increase in air pressure on the pneumatic cylinder 33 side. 37 remains in the closed operating state. In addition, since the flow to the pressure regulating valve 12 is blocked by the check valve 36, a good cushioning effect by the compressed air can be obtained.

With this operation, the air pressure of the pilot compressed air of the pressure regulating valve 12 is raised and lowered by operating the pilot valve 13, thereby automatically operating the exhaust valve 37, and when the air pressure on the side of the pneumatic cylinder 33 temporarily increases. Since the air pressure absorbing means 51 automatically temporarily absorbs the rising air pressure on the pneumatic cylinder 33 side and closes the exhaust valve 37, the air on the pneumatic cylinder 33 side is automatically absorbed without the need for complicated valve operations. It is possible to effectively prevent a temporary increase in pressure from affecting the exhaust valve 37. In addition, since the compressed air on the pneumatic cylinder 33 side is directly exhausted to the outside by the exhaust valve 37 without going through a valve, the flow resistance during exhaust can be reduced and a large capacity can be effectively exhausted. The side air pressure can be quickly set to the desired value. Moreover, since the air pressure absorbing means 51 is disposed in the pilot path 48 of the exhaust valve 37, the air pressure absorbing means 51 can be made small, and the entire apparatus can be made smaller. Furthermore, air pressure absorption means 5
1 is a first flow rate adjustment valve 52 and a second flow rate adjustment valve 5
By adjusting the throttle opening ratio of No. 4, the absorption time of the rising air pressure on the pneumatic cylinder 33 side can be easily adjusted, so it can be used for a variety of purposes. Furthermore, in one embodiment, the volume of the action chamber 45 of the exhaust valve 37 is formed larger than that of the existing valve so that compressed air can be accumulated, so that the pneumatic cylinder 3
A temporary increase in air pressure on the third side can be absorbed well, and a temporary increase in air pressure on the pneumatic cylinder 33 side can be better prevented from affecting the exhaust valve 37.

In addition, in one embodiment, the air pressure absorbing means 51 was composed of the first flow rate adjustment valve 52, the air tank 53, and the second flow rate adjustment valve 54, but the second flow rate adjustment valve 54
Of course, the present invention is not limited to one embodiment, and the capacity of the air tank 53 may be increased without providing the air tank 53, or the number of air tanks 53 may be changed.

[Effects of the invention] As described above, according to the invention, a pressure regulating valve whose operating pressure can be freely set by adjusting the pressure of the pilot compressed air is provided to reduce the pressure of the compressed air from the pressure source side. A flow passage is connected to the outlet side of the regulating valve to allow the compressed air whose pressure has been reduced to flow out to the pneumatic actuator side via the check valve. An exhaust valve is provided to exhaust the air to the outside, and the exhaust valve introduces the pilot compressed air of the pressure regulating valve, and uses the acting force of the air pressure to bias the valve body that opens and closes between the flow path and the exhaust path in the closing direction. At the same time, an action chamber formed to face the pilot compressed air and introduce the compressed air therein is connected to the flow passage on the outlet side of the check valve by a pilot passage, and the pilot passage of the exhaust valve is provided with air pressure generated by the operation of a pneumatic actuator. Air pressure absorbing means is provided to temporarily absorb the increased air pressure on the pneumatic actuator side, so that the air pressure in the exhaust valve action chamber does not increase as the air pressure on the actuator side temporarily increases. A temporary increase in air pressure on the pneumatic actuator side can be effectively prevented from affecting the exhaust valve without requiring any valve operation.

In addition, since the compressed air on the pneumatic actuator side is directly exhausted to the outside by the exhaust valve, the flow resistance of the compressed air during exhaust can be reduced, and large capacity can be effectively exhausted, and the air pressure on the pneumatic actuator side can be reduced. A desired value can be set quickly. In addition, since the air pressure absorbing means is disposed in the pilot path of the exhaust valve, the air pressure absorbing means can be made smaller and the entire apparatus can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an air pressure regulating device showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the air pressure regulating device, and Fig. 3 is a sectional view taken along the line - of Fig. 2. FIG. 4 is a circuit diagram showing a conventional example. 12...Pressure regulating valve, 33...Pneumatic cylinder, 35...Flow passage, 36...Check valve, 37...
...exhaust valve, 48...pilot passage, 51...air pressure absorption means.

Claims (1)

[Scope of utility model registration request] A pressure regulating valve whose operating pressure can be freely set by adjusting the pressure of the pilot compressed air is provided to control the pressure reduction of the compressed air from the pressure source side, and is connected to the outlet side of the pressure regulating valve to control the pressure reduced. A flow path is provided for air to flow out to the pneumatic actuator side via a check valve, and an exhaust valve is provided that connects to the flow path on the check valve outlet side to exhaust compressed air from the pneumatic actuator side to the outside. The pilot compressed air of the pressure regulating valve is introduced, and the acting force of the air pressure biases the valve body that opens and closes between the flow passage and the exhaust passage in the closing direction, and the compressed air is introduced in opposition to the pilot compressed air. An action chamber formed so as to be connected to the flow passage on the outlet side of the check valve by a pilot passage is provided, and the exhaust valve action is applied to the pilot passage of the exhaust valve as the air pressure on the pneumatic actuator side increases temporarily due to the operation of the pneumatic actuator. An air pressure adjustment device comprising an air pressure absorbing means that temporarily absorbs the rising air pressure on the pneumatic actuator side so that the air pressure in the chamber does not rise accordingly.