Transverse skin stretching pitching mechanism control system

Abstract

The utility model discloses a control system of a transverse skin stretching pitching mechanism, which belongs to the technical field of skin stretching hydraulic machines and comprises a proportional servo valve, one end of the proportional servo valve is communicated with an oil tank, and the other end of the proportional servo valve is communicated with a counterbalance element. A check element is arranged between the proportional servo valve and the counterbalance element, one side of the check element is communicated with an electromagnetic reversing valve, the electromagnetic reversing valve is communicated with an oil tank, the counterbalance element is respectively communicated with a safety valve and a leak-free valve, one side of the leak-free valve is communicated with a supporting valve, and the supporting valve is communicated with the oil tank. A pressure sensing element and a shock-proof sensing element are further installed on one side of the counterbalance element, three stretch forming processes are provided for a pitching mechanism of the transverse skin stretch hydraulic press, and the use requirements of users for high efficiency and high quality are met.

Description

Technical Field

[0001] The utility model relates to the field of skin stretching hydraulic presses, and more specifically, to a control system for a horizontal skin stretching pitching mechanism. Background Technique

[0002] Skin stretching hydraulic presses belong to typical high-end equipment, which are applicable to the aerospace field and meet the production mode of small batches and multiple varieties in this field.

[0003] To complete the stretching of a part using a skin stretching machine often requires multiple different processes, and it is also necessary to meet the production requirements of parts with multiple different processes. Therefore, different actions need to be taken according to different processes. Designing a pitching mechanism control system that meets the process requirements according to the user's needs can improve the utilization rate of the user's equipment and the production efficiency of the workpieces. However, the existing skin stretching machines provide fewer processes and it is difficult to have multiple processes on one device, resulting in an increase in the cost for customers when purchasing equipment. Content of the Utility Model

[0004] To make up for the above deficiencies, the utility model provides a control system for a horizontal skin stretching pitching mechanism, aiming to improve the problem that the existing skin stretching machines provide fewer processes, resulting in an increase in the cost for customers when purchasing equipment.

[0005] The utility model is implemented as follows: A control system for a horizontal skin stretching pitching mechanism includes

[0006] A proportional servo valve, one end of the proportional servo valve is connected and installed with an oil tank, the other end of the proportional servo valve is connected with a counterbalance element, a check element is arranged between the proportional servo valve and the counterbalance element, one side of the check element is connected with an electromagnetic directional valve, the electromagnetic directional valve is connected with the oil tank, the counterbalance element is respectively connected with a safety valve and a non-leakage valve, one side of the non-leakage valve is connected with a support valve, the support valve is connected with the oil tank, and a pressure sensing element and a shock-resistant sensing element are respectively installed on one side of the counterbalance element.

[0007] In a preferred technical solution of the utility model, a pump group is arranged on one side of the proportional servo valve, and the pump group is connected with the oil tank.

[0008] In a preferred technical solution of the utility model, the counterbalance element includes a first counterbalance valve and a second counterbalance valve, and the first counterbalance valve and the second counterbalance valve are respectively connected and installed on two oil paths of the proportional servo valve.

[0009] In a preferred technical solution of the present utility model, a check element is provided between the counterweight element and the proportional servo valve. The check element includes a first check valve and a second check valve. The second check valve is arranged between the proportional servo valve and the second counterweight valve, and the first check valve is arranged between the first counterweight valve and the proportional servo valve.

[0010] In a preferred technical solution of the present utility model, the first check valve and the second check valve are respectively communicated with the electromagnetic directional valve, and the electromagnetic directional valve is communicated with the fuel tank.

[0011] In a preferred technical solution of the present utility model, the shock-resistant sensing element includes a first shock-resistant pressure gauge and a second shock-resistant pressure gauge. The first shock-resistant pressure gauge is connected and installed on the first counterweight valve, and the second shock-resistant pressure gauge is connected and installed on the second counterweight valve.

[0012] In a preferred technical solution of the present utility model, the pressure sensing element includes a first pressure sensor and a second pressure sensor. The first pressure sensor is connected and installed between the first counterweight valve and the first shock-resistant pressure gauge, and the second shock-resistant pressure gauge is installed between the second counterweight valve and the second shock-resistant pressure gauge.

[0013] In a preferred technical solution of the present utility model, a safety valve is connected and installed on the first counterweight valve, and the safety valve is located between the first counterweight valve and the first pressure sensor.

[0014] In a preferred technical solution of the present utility model, a self-priming check valve is connected to the first counterweight valve, and the self-priming check valve is located between the safety valve and the first counterweight valve.

[0015] In a preferred technical solution of the present utility model, a non-leakage valve is provided between the second counterweight valve and the second pressure sensor, and a support valve is arranged on one side of the non-leakage valve.

[0016] The beneficial effects of the present utility model are as follows: A transverse skin stretching pitching mechanism control system obtained by the above design of the present utility model is used for clamp frame stretch forming during use. Before the start of this stretching process, the pitching cylinder should be in the state where the pull rod retracts, that is, the pitching angle is the largest. Under the closed-loop control of the proportional servo valve and the pressure sensing element, the pitching mechanism control system can continuously reduce the pitching angle of the clamp jaws. At this time, the oil circuit of the workbench is closed, and the clamp jaws actively stretch and form the workpiece on the fixed workbench. At the same time, according to the feedback signal of the pressure sensing element, the pressures of the two chambers of the pitching cylinder are monitored at all times, and the opening of the proportional servo valve is adjusted at any time when stretching the skin workpiece to adjust the oil supply amounts of the two chambers of the pitching cylinder.

[0017] Table forming: The main oil circuit of the pitching mechanism control system is cut off. The pitching cylinder is locked at a certain angle by the counterbalancing element to keep the pitching angle of the clamp frame fixed. The skin workpiece is formed by the gradually rising table. Since the counterbalancing element can detect the pressures in both chambers of the pitching cylinder and continuously adjust the opening, it can ensure that there is no overload phenomenon during skin stretching forming;

[0018] Floating forming: Before the start of this stretching process, the pitching cylinder should be in the state where the pull rod extends, that is, the pitching angle is the smallest. The main oil circuit of the pitching mechanism control system is cut off. The clamp frame is in a floating state during the forming process and continuously adjusts the clamp frame angle with the lifting of the table, relying on the rodless chamber support valve to ensure the safety of the control system;

[0019] Three forming processes are provided for the pitching mechanism of the horizontal skin stretching hydraulic press to meet the high-efficiency and high-quality usage requirements of users. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of the structural block diagram provided by the embodiment of the present invention.

[0022] In the figure: 1. Oil tank; 2. Pump group; 3. Proportional servo valve; 4. Counterbalancing element; 5. Check element; 41. First counterbalancing valve; 42. Second counterbalancing valve; 51. First check valve; 52. Second check valve; 6. Electromagnetic directional valve; 7. Safety valve; 8. Self-priming check valve; 9. Leakage-free valve; 10. Support valve; 11. Pressure sensing element; 12. Shock-resistant sensing element; 111. First pressure sensor; 112. Second pressure sensor; 121. First shock-resistant pressure gauge; 122. Second shock-resistant pressure gauge. Specific Embodiments

[0023] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] Please refer toFigure 1 , the utility model provides a technical solution: a horizontal skin stretching pitching mechanism control system, including

[0025] A proportional servo valve 3 is connected to an oil tank 1 at one end, and the other end of the proportional servo valve 3 is connected to a counterbalance element 4. A check element 5 is arranged between the proportional servo valve 3 and the counterbalance element 4. One side of the check element 5 is connected to an electromagnetic reversing valve 6, and the electromagnetic reversing valve 6 is connected to the oil tank 1. The counterbalance element 4 is respectively connected to a safety valve 7 and a leak-free valve 9. One side of the leak-free valve 9 is connected to a support valve 10, and the support valve 10 is connected to the oil tank 1. A pressure sensing element 11 and a shock-resistant sensing element 12 are also respectively installed on one side of the counterbalance element 4.

[0026] The oil tank 1, the pump group 2, the proportional servo valve 3, the counterbalance element 4, the check element 5, the electromagnetic reversing valve 6, the safety valve 7, the self-priming check valve 8, the leak-free valve 9, the support valve 10, the pressure sensing element 11 and the shock-resistant sensing element 12 are all connected and installed through pipelines (oil pipes).

[0027] A pump group 2 is arranged on one side of the proportional servo valve 3, and the pump group 2 is connected to the oil tank 1. The counterbalance element 4 includes a first counterbalance valve 41 and a second counterbalance valve 42. The first counterbalance valve 41 and the second counterbalance valve 42 are respectively connected and installed on two oil paths of the proportional servo valve 3. There are two oil paths at both ends of the proportional servo valve 3, and the two oil paths are respectively connected to the first counterbalance valve 41 and the second counterbalance valve 42. The interface of the first counterbalance valve 41 of the proportional servo valve 3 is connected to the rod chamber of the pitching cylinder, and the interface of the second counterbalance valve 42 is connected to the rodless chamber of the pitching cylinder. Among them, the first counterbalance valve 41 and the second counterbalance valve 42 are two main oil paths of the proportional servo valve 3.

[0028] A check element 5 is arranged between the counterbalance element 4 and the proportional servo valve 3. The check element 5 includes a first check valve 51 and a second check valve 52. The second check valve 52 is arranged between the proportional servo valve 3 and the second counterbalance valve 42, and the first check valve 51 is arranged between the first counterbalance valve 41 and the proportional servo valve 3. The first check valve 51 and the second check valve 52 are respectively connected to the electromagnetic reversing valve 6, and the electromagnetic reversing valve 6 is connected to the oil tank 1.

[0029] The shock-resistant sensing element 12 includes a first shock-resistant pressure gauge 121 and a second shock-resistant pressure gauge 122. The first shock-resistant pressure gauge 121 is connected and installed on the first counterbalance valve 41, and the second shock-resistant pressure gauge 122 is connected and installed on the second counterbalance valve 42. The pressure sensing element 11 includes a first pressure sensor 111 and a second pressure sensor 112. The first pressure sensor 111 is connected and installed between the first counterbalance valve 41 and the first shock-resistant pressure gauge 121, and the second shock-resistant pressure gauge 122 is installed between the second counterbalance valve 42 and the second shock-resistant pressure gauge 122.

[0030] A safety valve 7 is connected and installed on the first counterbalance valve 41, and the safety valve 7 is located between the first counterbalance valve 41 and the first pressure sensor 111. A self-priming check valve 8 is connected to the first counterbalance valve 41, and the self-priming check valve 8 is located between the safety valve 7 and the first counterbalance valve 41. A no-leakage valve 9 is provided between the second counterbalance valve 42 and the second pressure sensor 112, and a support valve 10 is provided on one side of the no-leakage valve 9.

[0031] Working principle: In the clamp frame stretch forming process, the pump group 2 sucks oil from the power oil tank 1, both ends of the proportional servo valve 3 are connected, the pull rod of the pitching cylinder retracts to the in-place position, and the pitching angle of the clamp frame is the largest. At this time, the workbench is located at a certain position in contact with the workpiece and remains fixed. After the stretch forming starts, the proportional servo valve 3 is energized, and both ends of the proportional servo valve 3 are respectively connected. The oil supplied by the pump directly enters the rodless cavity of the pitching cylinder through the second counterbalance valve 42. Under the action of the high-pressure oil, the first counterbalance valve 41 opens, and the oil in the rod cavity of the pitching cylinder is discharged into the oil tank 1; at the same time, the electromagnetic directional valve 6 is energized to ensure that the first check valve 51 and the second check valve 52 are not connected to the oil tank 1.

[0032] In the workbench stretch forming process, the pump group 2 sucks oil from the power oil tank 1, sucks and discharges oil from the two chambers of the pitching cylinder through the proportional servo valve 3. After adjusting the extension length of the rod of the pitching cylinder to make the clamp frame stay at an appropriate pitching angle, the proportional servo valve 3 is cut off, and both chambers of the pitching cylinder are not connected to the main oil circuit. The clamp frame is fixed at a certain angle by relying on a pair of interlocked first counterbalance valve 41 and second counterbalance valve 42 through the pitching cylinder. After the stretch forming starts, the workbench actively rises for stretch forming, and the interlocked counterbalance element 4 can maintain the angle of the clamp frame unchanged. Since the first counterbalance valve 41 and the second counterbalance valve 42 can detect the pressures in the two chambers of the pitching cylinder and continuously adjust the opening, passive oil discharge will occur, and the passive oil discharge can be discharged back to the oil tank 1 through the electromagnetic directional valve 6.

[0033] In the floating stretch forming process, the pump group 2 sucks oil from the power oil tank 1, both ends of the proportional servo valve 3 are connected, the pull rod of the pitching cylinder extends to the in-place position, and the pitching angle of the clamp frame is the smallest. At this time, the proportional servo valve 3 is cut off, and both chambers of the pitching cylinder are not connected to the main oil circuit. After the stretch forming starts, the workbench actively rises for stretch forming, and the pitching angle of the clamp frame continuously increases as the workbench rises. At this time, the rod chamber sucks oil through the self-priming check valve 8, the no-leakage valve 9 is energized, the rodless cavity of the pitching cylinder is connected to the support valve 10, and the rodless cavity discharges oil under the set support pressure to provide a certain back pressure for forming.

[0034] At the same time, the above three process actions can be used in combination to perform stretch forming for the same part.

[0035] The above is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A lateral skin stretching pitch mechanism control system, characterized in that Including A proportional servo valve, one end of the proportional servo valve is connected and installed with an oil tank, the other end of the proportional servo valve is connected with a counterbalance element, a check element is arranged between the proportional servo valve and the counterbalance element, one side of the check element is connected with an electromagnetic directional valve, the electromagnetic directional valve is connected with the oil tank, the counterbalance element is respectively connected with a safety valve and a zero-leakage valve, one side of the zero-leakage valve is connected with a support valve, the support valve is connected with the oil tank, and a pressure sensing element and a shock-resistant sensing element are respectively installed on one side of the counterbalance element.

2. The lateral skin stretching pitch mechanism control system according to claim 1, characterized in that: A pump set is arranged on one side of the proportional servo valve, and the pump set is connected with the oil tank.

3. The lateral skin stretching pitch mechanism control system according to claim 2, characterized in that: The counterbalance element includes a first counterbalance valve and a second counterbalance valve, and the first counterbalance valve and the second counterbalance valve are respectively connected and installed on two oil paths of the proportional servo valve.

4. The lateral skin stretching pitch mechanism control system according to claim 3, characterized in that: A check element is arranged between the counterbalance element and the proportional servo valve. The check element includes a first check valve and a second check valve. The second check valve is arranged between the proportional servo valve and the second counterbalance valve, and the first check valve is arranged between the first counterbalance valve and the proportional servo valve.

5. The lateral skin stretching pitch mechanism control system according to claim 4, characterized in that: The first check valve and the second check valve are respectively connected with the electromagnetic directional valve, and the electromagnetic directional valve is connected with the oil tank.

6. The lateral skin stretching pitch mechanism control system according to claim 4, characterized in that: The shock-resistant sensing element includes a first shock-resistant pressure gauge and a second shock-resistant pressure gauge. The first shock-resistant pressure gauge is connected and installed on the first counterbalance valve, and the second shock-resistant pressure gauge is connected and installed on the second counterbalance valve.

7. The lateral skin stretching pitch mechanism control system according to claim 6, characterized in that: The pressure sensing element includes a first pressure sensor and a second pressure sensor. The first pressure sensor is connected and installed between the first counterbalance valve and the first shock-resistant pressure gauge, and the second shock-resistant pressure gauge is installed between the second counterbalance valve and the second shock-resistant pressure gauge.

8. The lateral skin stretching pitch mechanism control system according to claim 7, characterized in that: A safety valve is connected and installed on the first counterbalance valve, and the safety valve is located between the first counterbalance valve and the first pressure sensor.

9. The lateral skin stretching pitch mechanism control system according to claim 8, characterized in that: A self-priming check valve is connected to the first counterbalance valve, and the self-priming check valve is located between the safety valve and the first counterbalance valve.

10. The lateral skin stretching pitch mechanism control system according to claim 8, characterized in that: A zero-leakage valve is arranged between the second counterbalance valve and the second pressure sensor, and a support valve is arranged on one side of the zero-leakage valve.

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