Pneumatic control valve

Abstract

The utility model relates to a pneumatic control valve, in particular to a pneumatic valve which is applied to a double-acting oil pressure device and used for controlling high-pressure oil to be input into and flow out of an oil pressure chamber. A first pneumatic control valve and a second pneumatic control valve are mainly combined into a whole, high-pressure oil flowing out of the first pneumatic control valve is connected to a first oil pressure chamber located on the lower side of a piston, high-pressure oil flowing out of the second pneumatic control valve is connected to a second oil pressure chamber located on the upper side of the piston, opening and closing of the pneumatic control valves are controlled through an electromagnetic valve, and different oil ways are opened. By installing the pneumatic valve provided by the utility model, when the double-acting die clamper is in a state of applying force to clamp a die but encounters unexpected power failure, the clamping force of the die clamper can be maintained, and the actual test shows that the clamping force can be at least as long as three months, so that the die cannot deviate or even fall off due to sudden power failure, and the effect of greatly improving the safety is achieved.

Description

Technical Field

[0001] This utility model relates to a pneumatic control valve, particularly a pneumatic valve that can be used in a reciprocating hydraulic device to control the input and output of high-pressure oil from the hydraulic chamber. Background Technology

[0002] Please refer to the compound hydraulic clamping device described in Taiwan Invention Patent I754481. This compound hydraulic device has a first hydraulic chamber on the lower side of the piston and a second hydraulic chamber on the upper side of the piston. When high-pressure oil is input into the first hydraulic chamber, the piston can be pushed up quickly. When high-pressure oil is input into the second hydraulic chamber, the piston can be reset quickly, thus achieving the effect of rapid mold changing.

[0003] However, traditional high-pressure oil is delivered from the hydraulic unit to the hydraulic chamber using only a simple valve to control the output. In the event of a power outage, the high-pressure oil will not remain in the hydraulic chamber, failing to maintain pressure. This causes the clamping device to stop exerting force, resulting in the mold falling out. This clamping device can hold molds ranging in weight from several kilograms to several tons. If an unexpected power outage causes the clamping device to loosen and the mold to fall, it could not only damage the mold and cause economic losses, but also potentially lead to serious industrial accidents. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the aforementioned traditional technology. The main technology and objective are: to design a pneumatically controlled valve that supplies high-pressure oil to the first and second oil pressure chambers of a reciprocating hydraulic device. This is achieved by integrating a first pneumatically controlled valve and a second pneumatically controlled valve into a single unit. High-pressure oil flowing from the first pneumatically controlled valve is connected to the first oil pressure chamber located below the piston, while high-pressure oil flowing from the second pneumatically controlled valve is connected to the second oil pressure chamber located above the piston. A solenoid valve controls the opening and closing of the pneumatically controlled valves, opening different oil circuits and thus controlling whether high-pressure oil is supplied.

[0005] To achieve the above objectives, this utility model provides a pneumatically controlled valve, comprising: a first pneumatically controlled valve containing a first accommodating space connected to a first oil inlet pipe, a first oil return pipe, and a first oil outlet pipe; a first double steel ball check valve assembly disposed at one end of the first accommodating space, comprising a first steel ball lifting valve for controlling the opening and closing of the first oil inlet pipe, and a second steel ball lifting valve for controlling the opening and closing of the first oil return pipe; a first pneumatic cylinder assembly disposed at the other end of the first accommodating space, comprising a first lifting rod connected to a first piston, the first piston having a first return spring near the first oil return pipe, and an air chamber on the other side for inputting high-pressure gas controlled by a solenoid valve to push the first piston; when the first piston is pushed by high-pressure gas, the first lifting rod can... Push open the second ball-operated valve; a second pneumatic valve, containing a second accommodating space connected to a second oil inlet pipe, a second oil return pipe, and a second oil outlet pipe; a second double ball-operated check valve assembly located at one end of the second accommodating space, including a third ball-operated valve to control the opening and closing of the second oil return pipe, and a fourth ball-operated valve to control the opening and closing of the second oil inlet pipe; a second pneumatic cylinder assembly located at the other end of the second accommodating space, containing a second lifting rod connected to a second piston, the second piston having an air chamber near the second oil return pipe that can be controlled by a solenoid valve to input high-pressure gas and push the second piston, and a second return spring on the other side; when the second piston is not pushed by high-pressure gas, the second lifting rod can push open the third ball-operated valve.

[0006] In some exemplary embodiments, the first double steel ball check valve includes: a first sleeve having at least one through hole in the middle; the first sleeve is sequentially assembled with a first steel ball seat, a first steel ball lifting valve, a first spring, a second steel ball lifting valve, and a second steel ball seat; the first steel ball seat has a first through hole in the middle communicating with the first oil inlet pipe; the second steel ball seat has a second through hole in the middle communicating with the first oil return pipe; by the elastic force of the first spring, in a natural state without power, the first steel ball lifting valve can be pressed against the first through hole, and the second steel ball lifting valve can be pressed against the second through hole.

[0007] In some exemplary embodiments, the second ball bearing seat may have at least one groove with at least one through hole.

[0008] In some exemplary embodiments, the second double ball check valve includes: a second sleeve having at least one through hole in the middle; the second sleeve is sequentially assembled with a third ball seat, a third ball lifting valve, a second spring, a fourth ball lifting valve, and a fourth ball seat; the fourth ball seat has a fourth through hole in the middle communicating with the second oil inlet pipe; the third ball seat has a third through hole in the middle communicating with the second oil return pipe; in the natural state without power, the second lifting rod continuously pushes open the third ball lifting valve.

[0009] In some exemplary embodiments, the third ball bearing seat may have at least one groove with at least one through hole.

[0010] According to the pneumatic control valve of this utility model, when the solenoid valve is energized, high-pressure gas flows into the pneumatic control valve, the first pneumatic control valve allows high-pressure oil to flow back, and the second pneumatic control valve outputs high-pressure oil; when the solenoid valve is de-energized, no high-pressure gas flows in, the first pneumatic control valve outputs high-pressure oil, and the second pneumatic control valve allows high-pressure oil to flow back; when there is an unexpected power outage, the first pneumatic control valve can keep the high-pressure oil in the pipeline without backflow. In this way, the high-pressure oil located on the piston side of the reciprocating hydraulic device can remain in the first hydraulic chamber to maintain pressure, which means that the operation of the clamping mold can be maintained while waiting for the power to be restored. Attached Figure Description

[0011] Figure 1 This is a side sectional view of the present invention;

[0012] Figure 2 This is an exploded perspective view of the double steel ball check valve of this utility model;

[0013] Figure 3 This is a schematic diagram of the energized state of the solenoid valve of this utility model;

[0014] Figure 4 This is a schematic diagram of the solenoid valve in the de-energized state of this utility model;

[0015] Figure 5 This is a schematic diagram of the unexpected power outage state of this utility model.

[0016] Explanation of reference numerals in the attached figures

[0017] 10: First pneumatic control valve

[0018] 11: First Accommodation Space

[0019] 111: First oil inlet pipe

[0020] 112: First return oil pipe

[0021] 113: First oil outlet pipe

[0022] 12: First double ball check valve

[0023] 120: First sleeve

[0024] 121: First steel ball lifting valve

[0025] 122: Second steel ball lifting valve

[0026] 123: First steel ball seat

[0027] 124: First Spring

[0028] 125: Second steel ball seat

[0029] 126: First perforation

[0030] 127: Second perforation

[0031] 128: Groove

[0032] 129: Through hole

[0033] 13: First pneumatic cylinder

[0034] 131: First lifting lever

[0035] 132: First Piston

[0036] 133: First return spring

[0037] 134: Air chamber

[0038] 20: Second pneumatic control valve

[0039] 21: Second Accommodation Space

[0040] 211: Second oil inlet pipe

[0041] 212: Second return oil pipe

[0042] 213: Second oil outlet pipe

[0043] 22: Second double ball valve

[0044] 220: Second sleeve

[0045] 221: Third steel ball lifting valve

[0046] 222: Fourth steel ball lifting valve

[0047] 223: Third steel ball seat

[0048] 224: The Second Spring

[0049] 225: Fourth steel ball holder

[0050] 226: Third perforation

[0051] 227: Fourth perforation

[0052] 228: Groove

[0053] 229: Through hole

[0054] 23: Second pneumatic cylinder

[0055] 231: Second lifting lever

[0056] 232: Second Piston

[0057] 233: Second return spring

[0058] 234: Air chamber. Detailed Implementation

[0059] Please see Figures 1 to 5 The present invention provides a pneumatic control valve, which mainly combines a first pneumatic control valve 10 and a second pneumatic control valve 20 into one unit. The first pneumatic control valve 10 includes a first accommodating space 11 connected to a first oil inlet pipe 111, a first oil return pipe 112, and a first oil outlet pipe 113. A first double steel ball check valve 12 is disposed at one end of the first accommodating space 11, including a first steel ball lifting valve 121 that controls the opening and closing of the first oil inlet pipe 111, and a second steel ball lifting valve 122 that controls the opening and closing of the first oil return pipe 112. A pneumatic cylinder 13 is located at the other end of the first accommodating space 11. It contains a first lifting rod 131 connected to a first piston 132. The first piston 132 is provided with a first return spring 133 near the first oil return pipe 112. On the other side, there is an air chamber 134 that can be controlled by a solenoid valve to input high-pressure gas and push the first piston 132. When the first piston 132 is pushed by high-pressure gas, the first lifting rod 131 can push open the second steel ball lifting valve 122 and make the first steel ball lifting valve 121 seal the first oil inlet pipe 111. When the first ball bearing lifting valve 121 is open and the second ball bearing lifting valve 122 is closed, high-pressure oil can be input from the first oil inlet pipe 111 and output from the first oil outlet pipe 113 to the hydraulic chamber where work is to be done; when the first ball bearing lifting valve 121 is closed and the second ball bearing lifting valve 122 is open, the high-pressure oil that has completed its work can flow back from the first oil outlet pipe 113 and flow back to the oil tank via the first return oil pipe 112.

[0060] The second pneumatic control valve 20 includes a second accommodating space 21 connected to a second oil inlet pipe 211, a second oil return pipe 212, and a second oil outlet pipe 213; a second double ball check valve 22 assembly is located at one end of the second accommodating space 21, including a third ball lifting valve 221 that controls the opening and closing of the second oil return pipe 212, and a fourth ball lifting valve 222 that controls the opening and closing of the second oil inlet pipe 211; a second pneumatic cylinder 23 assembly is located at the other end of the second accommodating space 21. The device includes a second lifting rod 231 connected to a second piston 232. The second piston 232 has a gas chamber 234 near the second return oil pipe 212, which can be controlled by a solenoid valve to input high-pressure gas and push the second piston 232. A second return spring 233 is located on the other side. When the second piston 232 is not pushed by high-pressure gas, the second lifting rod 231 can push open the third steel ball lifting valve 221, and cause the fourth steel ball lifting valve 222 to seal the second inlet oil pipe 211. When the fourth steel ball lifting valve 222 is open and the third steel ball lifting valve 221 is closed, high-pressure oil can be input from the second inlet oil pipe 211 and output from the second outlet oil pipe 213 to the hydraulic chamber where work is to be done. When the fourth steel ball lifting valve 222 is closed and the third steel ball lifting valve 221 is open, the high-pressure oil that has completed its work can flow back from the second outlet oil pipe 213 and then back to the oil tank via the second return oil pipe 212.

[0061] Please see Figure 2 The first double steel ball check valve 12 further includes: a first sleeve 120 with at least one through hole in the middle for liquid to flow out and in; the first sleeve 120 is sequentially assembled with a first steel ball seat 123, a first steel ball lifting valve 121, a first spring 124, a second steel ball lifting valve 122 and a second steel ball seat 125; the first steel ball seat 123 has a first through hole 126 in the middle that communicates with the first oil inlet pipe 111; the second steel ball seat 125 has a second through hole 127 in the middle that communicates with the first oil return pipe 112; by the elastic force of the first spring 124, in the natural state without power, the first steel ball lifting valve 121 can press against the first through hole 126 and the second steel ball lifting valve 122 can press against the second through hole 127. The second steel ball seat 125 may have at least one groove 128, which has at least one through hole 129 for liquid to flow back from the first oil outlet pipe 113 and through the first double steel ball check valve 12 to flow back to the oil tank from the first oil return pipe 112.

[0062] Similar to the first double ball check valve 12, the second double ball check valve 22 includes: a second sleeve 220 with at least one through hole in the middle for liquid to flow out and in; the second sleeve 220 is sequentially assembled with a third ball seat 223, a third ball lifting valve 221, a second spring 224, a fourth ball lifting valve 222, and a fourth ball seat 225; the fourth ball seat 225 has a fourth through hole 227 in the middle communicating with the second oil inlet pipe 211; the third ball seat 223 has a third through hole 226 in the middle communicating with the second oil return pipe 212; in the natural state without power, the second lifting rod 231 continuously pushes open the third ball lifting valve 221. The third ball seat 223 may have at least one groove 228, and the groove 228 has at least one through hole 229.

[0063] Please refer to the actual application status of this utility model. Figures 3 to 5 This utility model uses a solenoid valve to control the opening and closing of a pneumatic control valve. By controlling whether high-pressure gas simultaneously enters the first pneumatic cylinder 13 and the second pneumatic cylinder 23, and whether it pushes the first piston 132 and the second piston 232, it achieves the effect of opening different oil circuits. Thus, in practical applications, there will be three situations:

[0064] 1. When the solenoid valve is energized: This means that high-pressure gas enters the first pneumatic cylinder 13 and the second pneumatic cylinder 23 at the same time, pushing the first piston 132 and the second piston 232 to the left. At the same time, the hydraulic unit will continuously input high-pressure oil from the first oil inlet pipe 111 and the second oil inlet pipe 211. At this time, the first pneumatic control valve allows the high-pressure oil to flow back and the second pneumatic control valve outputs high-pressure oil.

[0065] 2. Solenoid valve de-energized state: meaning there is no high-pressure gas present, the first return spring 133 and the second return spring 233 will push the first piston 132 and the second piston 232 to the right to reset, and at the same time the hydraulic part will continuously input high-pressure oil from the first oil inlet pipe 111 and the second oil inlet pipe 211. At this time, the first pneumatic control valve outputs high-pressure oil and the second pneumatic control valve allows the high-pressure oil to flow back.

[0066] 3. Unexpected power failure state: This means that not only is the solenoid valve de-energized and there is no high-pressure gas input, but the hydraulic section is also de-energized and there is no high-pressure oil input. At this time, the first pneumatic control valve can keep the high-pressure oil in the pipeline and prevent it from flowing back.

[0067] For a further explanation of the operating states of this invention under the above three conditions, please refer to [link / reference needed]. Figure 3This diagram illustrates the energized state of the solenoid valve. When the solenoid valve is energized and the hydraulic unit continuously supplies high-pressure oil, high-pressure gas enters air chambers 134 and 234, pushing the first piston 132 and the second piston 232 to the left. At this time, the first lifting rod 131 of the first pneumatic control valve 10 pushes the second ball-operated lifting valve 122 to the left, and the force exerted by the first lifting rod 131 to the left also causes the first ball-operated lifting valve 121 to block the first oil inlet pipe 111 to the left, opening the oil passage of the first oil outlet pipe 113, the second ball-operated lifting valve 122, and the first return oil pipe 112. Conversely, at this time, the second lifting rod 231 of the second pneumatic control valve 20 moves to the left and no longer exerts force on the third ball-operated lifting valve 221. The high-pressure oil in the second oil inlet pipe 211 can push open the fourth ball-operated lifting valve 222 and block the third ball-operated lifting valve 221 to the left, thus blocking the second return oil pipe 212. When the solenoid valve is energized, high-pressure oil can be discharged from the second oil outlet pipe 213 and returned from the first oil outlet pipe 113.

[0068] Please see Figure 4 This diagram illustrates the solenoid valve in its de-energized state. When the solenoid valve is de-energized and the hydraulic unit continues to supply high-pressure oil, the first return spring 133 and the second return spring 233 will push the first piston 132 and the second piston 232 to the right to reset. At this time, the first lifting rod 131 of the first pneumatic control valve 10 will stop applying force to the second ball-operated lifting valve 122. The high-pressure oil in the first oil inlet pipe 111 can push open the first ball-operated lifting valve 121 and block the second ball-operated lifting valve 122 to the right, thus sealing the first return oil pipe 112. Conversely, at this time, the second lifting rod 231 of the second pneumatic control valve 20 will continue to apply force to the third ball-operated lifting valve 221 to open the passage, and simultaneously push the second ball-operated lifting valve 122 to the right to block the first return oil pipe 112. Thus, when the solenoid valve is de-energized, high-pressure oil can be allowed to exit from the first oil outlet pipe 113 and return from the second oil outlet pipe 213.

[0069] When this invention is applied to a reciprocating hydraulic device, such as the reciprocating mold clamping device described in Taiwan Invention Patent I754481, the first oil outlet pipe 113 is connected to the first hydraulic chamber located below the piston, and the second oil outlet pipe 213 is connected to the second hydraulic chamber located above the piston. When the solenoid valve is de-energized, high-pressure oil can be discharged from the first oil outlet pipe 113, pushing the piston of the mold clamping device to clamp the mold. At this time, if there is residual oil in the second hydraulic chamber above the piston, it can flow from the second oil outlet pipe 213 through the third steel ball lifting valve 221 and return to the oil tank through the second return oil pipe 212. When the solenoid valve is energized, high-pressure oil can be discharged from the second oil outlet pipe 213, pushing the piston of the mold clamping device to release the mold. If there is residual oil in the first hydraulic chamber below the piston, it can flow from the first oil outlet pipe 113 through the second steel ball lifting valve 122 and return to the oil tank through the first return oil pipe 112. By opening and closing the pneumatic control valve of this invention using a solenoid valve, the piston of the mold clamp can be quickly pushed up and down to achieve the effect of rapid mold changing.

[0070] In addition, please refer to the following: Figure 5 This is a diagram illustrating an unexpected power outage. Figure 4 Comparing the schematic diagrams of only the solenoid valve being de-energized, the states of the second pneumatic control valve 20 are the same in both cases. The only difference in the first pneumatic control valve 10 is that, in the event of an unexpected power outage, high-pressure oil will not be continuously input. At this time, since there is no continuous high-pressure oil input into the first oil inlet pipe 111, the first ball-operated lifting valve 121 will not be pushed open to the right. The elastic force of the first spring 124, in its natural state without power, allows the first ball-operated lifting valve 121 and the second ball-operated lifting valve 122 to push against each other to the left and right, thus sealing both the first oil inlet pipe 111 and the first return pipe 112. This ensures that the oil in the hydraulic chamber connected to the first oil outlet pipe 113 remains within the hydraulic chamber and does not leak out. In other words, when the mold clamp is in a state of applying force to clamp the mold but is de-energized, the mold will not shift or even fall due to the sudden power outage.

[0071] Based on the above structure, the following effects and advantages can be obtained:

[0072] (1) When using a traditional double-acting hydraulic device, since there is a hydraulic valve on the upper and lower sides of the piston, two separate valves are required to control the high-pressure oil input. This utility model integrates the first pneumatic control valve and the second pneumatic control valve into one unit, which can control the two valves simultaneously, thus simplifying the installation.

[0073] (2) Traditional installations use two separate valves, which do not maintain pressure. In the event of an unexpected power outage, the reciprocating hydraulic device cannot maintain operation, potentially causing the mold to fall, be damaged, or even result in an industrial accident. This invention integrates the first and second pneumatic control valves into one unit and places the return spring in the opposite position to the piston. This simple interchange produces an unexpected pressure-maintaining effect, making it a remarkable invention. The pneumatic control valve of this invention can maintain the clamping force of the mold clamp. Actual testing has shown that this can be maintained for at least three months, preventing the mold from shifting or falling due to a sudden power outage, avoiding economic losses, and significantly improving safety.

[0074] In conclusion, this utility model has a groundbreaking structure and an improved design, while also achieving industrial applicability and advancement. Furthermore, this utility model is not found in any information that can be known to the public, and thus possesses novelty, and therefore complies with the provisions of patent laws and regulations.

[0075] However, the above description is only one of the preferred embodiments of this utility model and should not be used to limit the scope of implementation of this utility model; that is, all equivalent changes and modifications created in accordance with the claims of this utility model should still fall within the scope of this utility model patent.

Claims

1. A pneumatically controlled valve, characterized in that, Include: A first pneumatic control valve, which contains a first accommodating space and is connected to a first oil inlet pipe, a first oil return pipe and a first oil outlet pipe; A first double steel ball check valve assembly is provided at one end of the first accommodating space, including a first steel ball lifting valve that can control the opening and closing of the first oil inlet pipe and a second steel ball lifting valve that can control the opening and closing of the first oil return pipe. A first pneumatic cylinder assembly is located at the other end of the first accommodating space. It contains a first lifting rod connected to a first piston. The first piston is provided with a first return spring near the first oil return pipe. On the other side, there is an air chamber that can be controlled by a solenoid valve to input high-pressure gas and push the first piston. When the first piston is pushed by high-pressure gas, the first lifting rod can push open the second steel ball lifting valve; A second pneumatic control valve, which contains a second accommodating space and is connected to a second oil inlet pipe, a second oil return pipe and a second oil outlet pipe; A second double steel ball check valve assembly is provided at one end of the second accommodating space, including a third steel ball lifting valve that can control the opening and closing of the second return oil pipe and a fourth steel ball lifting valve that can control the opening and closing of the second inlet oil pipe. A second pneumatic cylinder assembly is located at the other end of the second accommodating space. It contains a second lifting rod connected to a second piston. The second piston has an air chamber near the second return oil pipe side, which can be controlled by a solenoid valve to input high-pressure gas and push the second piston. A second return spring is provided on the other side. When the second piston is not pushed by high-pressure gas, the second lifting rod can push open the third steel ball lifting valve.

2. The pneumatic control valve as described in claim 1, characterized in that, The first double ball-operated check valve includes: A first sleeve having at least one perforation in the middle; The first sleeve is sequentially assembled with a first steel ball seat, a first steel ball lifting valve, a first spring, a second steel ball lifting valve, and a second steel ball seat; The first steel ball holder has a first through hole in the middle that communicates with the first oil inlet pipe; The second steel ball seat has a second through hole in the middle that communicates with the first oil return pipe; The first spring's elastic force allows the first steel ball lifting valve to press against the first through hole and the second steel ball lifting valve to press against the second through hole in a natural, unpowered state.

3. The pneumatic control valve as described in claim 1, characterized in that: The second steel ball holder may have at least one groove with at least one through hole.

4. The pneumatic control valve as described in any one of claims 1 to 3, characterized in that, The second double ball valve includes: A second sleeve having at least one perforation in the middle; The second sleeve is sequentially assembled with a third steel ball seat, a third steel ball lifting valve, a second spring, a fourth steel ball lifting valve, and a fourth steel ball seat; The fourth steel ball seat has a fourth through hole in the middle that communicates with the second oil inlet pipe; The third steel ball seat has a third through hole in the middle that connects to the second return oil pipe; In its natural state without power, the second lifting lever continuously pushes open the third steel ball lifting valve.

5. The pneumatic control valve as described in claim 4, characterized in that: The third steel ball holder may have at least one groove with at least one through hole.

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