High Vacuum Vacuum Valve Actuator

Abstract

The present invention belongs to the field of die-casting technology, and relates to a high vacuum vacuum valve driver, including an oil supply pipeline for driving a vacuum valve core capable of telescopic movement in a hydraulic oil cylinder, wherein two chambers of the hydraulic oil cylinder are respectively connected to an open oil circuit and a closed oil circuit, wherein the oil supply pipeline includes an oil supply pipe connected to a P port of an oil tank and an oil return pipe connected to a T port of an oil tank, wherein a check valve and an accumulator are sequentially arranged on the oil supply pipe, wherein a branch of the oil supply pipe connected to the open oil circuit is provided with a first solenoid valve, wherein a branch of the oil supply pipe connected to the closed oil circuit is provided with a second solenoid valve, wherein the open oil circuit and the closed oil circuit are respectively connected to an electromagnetic reversing valve located on the return oil pipe, wherein the first solenoid valve, the second solenoid valve and the electromagnetic reversing valve are controlled in linkage. The mechanism utilizes two electromagnetic valves in coordination with the reversing valve to make the hydraulically controlled vacuum valve respond faster, and the response time can reach less than 50ms, which is conducive to high-precision control of die-casting air extraction.

Description

Technical Field

[0001] The invention relates to the technical field of die casting, and in particular to a high vacuum valve driver. Background Art

[0002] Vacuum metal die-casting technology has been widely used in new energy vehicles, 5G communications, improvement of traditional automobile castings, electronics, household, aviation and other fields. Vacuum die-casting technology is to extract the air in the cavity before cooling the molten metal to reduce the injection pressure, reduce the porosity, increase the density of the product, and enhance the mechanical properties. The vacuum valve is a very important component in the vacuum die-casting process.

[0003] In order to improve the sensitivity of the vacuum valve, the valve core of the vacuum valve is controlled by hydraulic pressure, that is, the expansion and contraction of the valve core is controlled by alternately injecting oil into the front and rear chambers of the hydraulic cylinder. In the past, the hydraulic system only controlled the filling and discharge of oil in the two chambers through a reversing valve. The disadvantage of this structure is that there will be a short shutdown time when the reversing valve switches the flow direction. After this shutdown time, the pressure difference between the two chambers of the hydraulic cylinder will be reversed. However, for die-casting occasions, the opening and closing of the vacuum valve needs to be very sensitive, and the process requires less than 50ms, which cannot be met by the existing hydraulic system.

[0004] Therefore, it is necessary to improve the hydraulic system structure to avoid the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a high vacuum vacuum valve driver to make the vacuum valve respond faster.

[0006] The present invention achieves the above-mentioned purpose through the following technical scheme: a high vacuum vacuum valve driver, including an oil supply pipeline, which is used to drive a vacuum valve core that can telescope in a hydraulic cylinder, wherein two chambers of the hydraulic cylinder are respectively connected to an open oil circuit and a closed oil circuit, wherein the oil supply pipeline includes an oil supply pipe connected to a P port of an oil tank and an oil return pipe connected to a T port of an oil tank, wherein a check valve and an accumulator are sequentially arranged on the oil supply pipe, a branch of the oil supply pipe connected to the open oil circuit is provided with a first solenoid valve, a branch of the oil supply pipe connected to the closed oil circuit is provided with a second solenoid valve, the open oil circuit and the closed oil circuit are respectively connected to an electromagnetic reversing valve located on the return oil pipe, wherein the electromagnetic reversing valve controls whether the closed oil circuit is connected to the return oil pipe or whether the open oil circuit is connected to the return oil pipe, and the first solenoid valve, the second solenoid valve and the electromagnetic reversing valve are controlled in linkage.

[0007] Specifically, a pressure regulating valve is provided upstream of the check valve.

[0008] Furthermore, the pressure regulating valve is an electric valve.

[0009] Specifically, the hydraulic cylinder is fixed on a fixed plate, and a limit switch capable of limiting the opening position of the vacuum valve core is also provided on the fixed plate. The limit switch is linked to the first solenoid valve, the second solenoid valve and the solenoid reversing valve for control.

[0010] By adopting the above technical solution, the beneficial effects of the technical solution of the present invention are:

[0011] This mechanism uses the solenoid valve in conjunction with the reversing valve to make the hydraulically controlled vacuum valve respond faster. The response time can be less than 50ms, which is beneficial to the high-precision control of die-casting vacuum extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a working pipeline diagram of the high vacuum vacuum valve driver of the embodiment.

[0013] The numbers in the figure represent:

[0014] 1- oil supply pipeline, 11- oil delivery pipe, 111- check valve, 112- accumulator, 113- pressure regulating valve, 12- oil return pipe, 121- electromagnetic reversing valve, 13- open oil circuit, 131- first electromagnetic valve, 14- close oil circuit, 141- second electromagnetic valve;

[0015] 2- hydraulic cylinder, 21- vacuum valve core, 22- fixed plate, 23- limit switch;

[0016] 3- Fuel tank. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to specific embodiments.

[0018] Example:

[0019] like Figure 1 As shown, a high vacuum valve driver of the present invention comprises an oil supply pipeline 1, which is used to drive a vacuum valve core 21 capable of telescopic movement in a hydraulic cylinder 2, wherein two chambers of the hydraulic cylinder 2 are respectively connected to an open oil circuit 13 and a closed oil circuit 14, wherein the oil supply pipeline 1 comprises an oil delivery pipe 11 connected to a port of an oil tank 3P and an oil return pipe 12 connected to a port of an oil tank 3T, wherein a check valve 111 and an accumulator 112 are sequentially arranged on the oil delivery pipe 11, a branch of the oil delivery pipe 11 connected to the open oil circuit 13 is provided with a first solenoid valve 131, a branch of the oil delivery pipe 11 connected to the closed oil circuit 14 is provided with a second solenoid valve 141, the open oil circuit 13 and the closed oil circuit 14 are respectively connected to an electromagnetic reversing valve 121 located on the return oil pipe 12, and the first solenoid valve 131, the second solenoid valve 141 and the electromagnetic reversing valve 121 are controlled in linkage.

[0020] When inhaling, the electromagnetic reversing valve 121 first controls the oil circuit 14 to be closed and connected to the oil return pipe 12, and the liquid oil in the oil tank 3 passes through the check valve 111 on the oil delivery pipe 11, and then reaches the accumulator 112 to accumulate pressure, the first electromagnetic valve 131 opens to open the oil circuit 13, and the second electromagnetic valve 141 shuts off and closes the oil circuit 14, and the liquid oil enters the hydraulic cylinder 2 from above and allows the vacuum valve core 21 to move downward, and then opens the vacuum valve seat, at this time the vacuum suction port starts to inhale, and the liquid oil below the hydraulic cylinder 2 returns to the oil tank 3. After the vacuum valve core 21 is fully opened, the electromagnetic reversing valve 121 can be reversed, and at this time the first electromagnetic valve 131 and the second electromagnetic valve 141 do not move.

[0021] When not inhaling, the electromagnetic reversing valve 121 first controls the opening of the oil circuit 13 and connects it to the oil return pipe 12. The liquid oil in the oil tank 3 passes through the check valve 111 of the oil delivery pipe 11, and then reaches the accumulator 112 to accumulate pressure. The first electromagnetic valve 131 closes the open oil circuit 13, and the second electromagnetic valve 141 opens and closes the oil circuit 14. The liquid oil enters the hydraulic cylinder 2 from below and allows the vacuum valve core 21 to move upward, and then closes the vacuum valve seat. At this time, the vacuum suction port stops inhaling, and the liquid oil above the hydraulic cylinder 2 returns to the oil tank 3. After the vacuum valve core 21 is completely closed, the electromagnetic reversing valve 121 can be reversed, and the first electromagnetic valve 131 and the second electromagnetic valve 141 do not move.

[0022] In summary, there is a timing control between the electromagnetic reversing valve 121 and the first electromagnetic valve 131 and the second electromagnetic valve 141. When the vacuum valve core 21 reaches the limit state, the electromagnetic reversing valve 121 can be reversed and ready for the next action, and the check valve 111 can prevent the liquid oil from flowing back. When the vacuum valve core 21 starts to move, the first electromagnetic valve 131 and the second electromagnetic valve 141 change their states at the same time. Because the electromagnetic reversing valve 121 will not hinder the reverse flow of the liquid oil at this time, the vacuum valve has a faster response speed, and the response time can be less than 50ms, which is conducive to the high-precision control of die-casting vacuum.

[0023] like Figure 1 As shown, the hydraulic cylinder 2 is fixed on a fixed plate 22, and a limit switch 23 is also provided on the fixed plate 22 to limit the opening position of the vacuum valve core 21. The limit switch 23 can maintain the position after the vacuum valve core 21 is fully opened, so as to prevent the vacuum valve core 21 from affecting the passing area of ​​the vacuum valve seat when it is disturbed, thereby affecting the suction efficiency. The limit switch 23 can also be controlled in linkage with the first solenoid valve 131, the second solenoid valve 141 and the solenoid reversing valve 121, as a representation that the solenoid reversing valve 121 needs to be reversed.

[0024] like Figure 1As shown, a pressure regulating valve 113 is provided upstream of the check valve 111. The pressure regulating valve 113 can adjust the output oil pressure according to the nitrogen pressure of the accumulator 112. Specifically, according to the nitrogen pressure of the accumulator 112 of 80 bar, the pressure regulating valve 113 is adjusted to 120 bar pressure. After the accumulator 112 accumulates the pressure of 120 bar, the check valve 111 checks the oil supply point. When the vacuum valve needs to be closed, the second solenoid valve 141 is opened and the first solenoid valve 131 is closed for 20ms. The vacuum valve core 21 is closed by oil pressure, and the limit switch 23 is disengaged from the limit. The time at this time is 30ms. The solenoid reversing valve 121 allows the liquid oil above the hydraulic cylinder 2 to return to the oil tank 3 through the open oil circuit 13; when the vacuum valve needs to be opened, the first solenoid valve 131 is opened and the second solenoid valve 141 is closed for 20ms. The vacuum valve core 21 is opened by oil pressure, and the limit switch 23 returns to the limit. The time at this time is 30ms. The solenoid reversing valve 121 allows the liquid oil below the hydraulic cylinder 2 to return to the oil tank 3 through the closed oil circuit 14.

[0025] The pressure regulating valve 113 is an electric valve. In this way, the pressure regulation of the pressure regulating valve 113 can be set on the control system to facilitate data visualization.

[0026] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high vacuum valve driver, comprising an oil supply line, for driving a vacuum valve core capable of telescopic movement in a hydraulic cylinder, wherein two chambers of the hydraulic cylinder are respectively connected to an opening oil circuit and a closing oil circuit, and characterized in that: The oil supply pipeline includes an oil delivery pipe connected to the P port of the oil tank and an oil return pipe connected to the T port of the oil tank, a check valve and an accumulator are arranged on the oil delivery pipe in sequence, a first solenoid valve is arranged on the branch of the oil delivery pipe connected to the open oil circuit, a second solenoid valve is arranged on the branch of the oil delivery pipe connected to the closed oil circuit, the open oil circuit and the closed oil circuit are respectively connected to an electromagnetic reversing valve located on the return oil pipe, the electromagnetic reversing valve controls the connection between the closed oil circuit and the return oil pipe or the connection between the open oil circuit and the return oil pipe, and the first solenoid valve, the second solenoid valve and the electromagnetic reversing valve are controlled in linkage; a pressure regulating valve is arranged upstream of the check valve; the hydraulic cylinder is fixed on a fixed plate, and a limit switch capable of limiting the opening position of the vacuum valve core is also arranged on the fixed plate, and the limit switch is controlled in linkage with the first solenoid valve, the second solenoid valve and the electromagnetic reversing valve.

2. The high vacuum valve actuator according to claim 1, characterized in that: The pressure regulating valve is an electric valve.

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