A control system of an overlength pressure-maintaining follow-up proportional servo oil cylinder

Abstract

This invention discloses a control system for an ultra-long pressure-holding servo proportional hydraulic cylinder, comprising a hydraulic station, a servo cylinder, and an integrated multi-channel hydraulic block. The hydraulic station is equipped with a T-interface and a P-interface. The P-interface is connected to the P1-interface of the integrated multi-channel hydraulic block via a pipeline. The P1-interface is also divided into two paths: one path is connected to the outlet of a superimposed pressure reducing valve, and the other path is connected to the P-port of a two-position four-way directional valve. The A-port of the two-position four-way directional valve is connected to the A2-port of the integrated multi-channel hydraulic block, and the B-port of the two-position four-way directional valve is connected to the B2-port of the integrated multi-channel hydraulic block. This invention prevents leakage by setting externally controlled check valves at the A and B ports of the proportional directional valve. The opening and closing of the check valves are controlled by a two-position four-way solenoid directional valve, ensuring simultaneous opening and closing, thus guaranteeing smooth oil flow, preventing servo cylinder tool drop due to leakage in the proportional directional valve, and improving system stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large tonnage multi-cylinder synchronous numerical control bending machine control, in particular to a control system of an ultra-long pressure-maintaining follow-up proportional servo oil cylinder. BACKGROUND

[0002] At present, numerical control bending machines develop towards ultra-long and ultra-large tonnage. The length of the workpiece to be bent is from several meters to more than twenty meters, and some even reach thirty meters. Therefore, the workpiece processing process is not only long in time but also requires higher support for the workpiece. In order to prevent the workpiece from being bent due to the length of the workpiece being too long or exceeding the limit during processing, a special numerical control bending machine that can adapt to and process workpieces of such length and size exceeding the limit needs to be designed. Unlike general bending machines, this type of bending machine requires to adapt to the bending of ultra-long workpieces and follow the workpiece size during the processing of the workpiece. The bending machine step feeding size is the amount of the extension of the follow-up cylinder, which must be controlled accurately and cannot have any error. This puts quite strict conditions on the hydraulic system. Therefore, how to complete the action required by the mechanical part of the bending machine is a technical bottleneck that needs to be solved by the hydraulic control system. In order to better complete the bending process of the workpiece exceeding the limit, a new control system of an ultra-long pressure-maintaining follow-up proportional servo oil cylinder is specially proposed. SUMMARY

[0003] The present application aims to provide a control system of an ultra-long pressure-maintaining follow-up proportional servo oil cylinder to solve the problems proposed in the background.

[0004] In order to achieve the above object, the present application provides the following technical scheme: a control system of an ultralong pressure-maintaining follow-up proportional servo oil cylinder, comprising a hydraulic station, a servo oil cylinder and an integrated multi-path oil block, the hydraulic station is provided with a T interface and a P interface, the P interface is connected with a P1 interface of the integrated multi-path oil block through a pipeline, the P1 interface is divided into two paths, one path of the P1 interface is connected with an outlet of a superimposed pressure reducing valve, an inlet of the superimposed pressure reducing valve is connected with a P port of a three-position four-way proportional directional valve through a pipeline, an A port of the three-position four-way proportional directional valve is connected to an inlet of a superimposed one-way A port one-way valve, an outlet of the superimposed one-way A port one-way valve is connected to an A1 port of the integrated multi-path oil block, the A1 port of the integrated multi-path oil block is connected with a rodless cavity of the servo oil cylinder, and the A1 port of the integrated multi-path oil block is connected in parallel with two paths, a first path is connected with a first pressure measuring device, and a second path is connected with a first sensor; meanwhile, a B port of the three-position four-way proportional directional valve is connected to an inlet of a superimposed one-way B port one-way valve through a pipeline, an outlet of the superimposed one-way B port one-way valve is connected to a B1 port of the integrated multi-path oil block, the B1 port of the integrated multi-path oil block is connected with a rod cavity of the servo oil cylinder, and the B1 port of the integrated multi-path oil block is connected in parallel with two paths, a first path is connected with a third pressure measuring device, and a second path is connected with a third sensor; the other path of the P1 interface of the integrated multi-path oil block is connected with a P port of a two-position four-way directional valve, an A port of the two-position four-way directional valve is connected to an A2 port of the integrated multi-path oil block, meanwhile, a B port of the two-position four-way directional valve is connected to a B2 port of the integrated multi-path oil block, the B2 port of the integrated multi-path oil block is divided into two paths, a first path is connected to a control port of the superimposed one-way A port one-way valve, and a second path is connected to a control port of the superimposed one-way B port one-way valve; a pressure measuring port M of the superimposed pressure reducing valve is divided into two paths, a first path is connected with a second sensor, and a second path is connected with a second pressure measuring device.

[0005] Preferably, the superimposed pressure reducing valve is connected with the superimposed one-way B port one-way valve; the superimposed one-way B port one-way valve is connected with the superimposed one-way A port one-way valve.

[0006] Preferably, the T port of the hydraulic station is connected with a T1 port of the integrated multi-path oil block through a pipeline, the T1 port of the integrated multi-path oil block is divided into two paths, one path is connected with a T port of the two-position four-way directional valve, and the other path is connected with a T2 port of the integrated multi-path oil block.

[0007] The present application has the following beneficial effects:

[0008] (1) The present application sets the outer control type one-way valve for preventing leakage at the A and B ports of the proportional directional valve, the opening and closing of the one-way valve is controlled by the two-position four-way electromagnetic reversing valve, and the opening and closing is ensured to be simultaneous, the smoothness of the oil path is ensured, the leakage of the proportional directional valve is prevented, the phenomenon of the servo oil cylinder dropping the tool is avoided, and the stability of the system is improved.

[0009] (2) In this invention, the bending machine steps to feed the sheet metal and follows the bending process. The proportional directional valve controls the servo cylinder to change direction and position precisely, so as to achieve the purpose of following the movement. This reduces the disadvantages of the traditional feeding process, which causes the sheet metal to detach from the sheet metal and lose balance and generate noise after bending.

[0010] (3) The present invention precisely controls the size of the step feeding of the bending machine, that is, the amount of the follower cylinder extension, which overcomes the phenomenon of inconsistent extension length of the hydraulic cylinder of the traditional bending machine and the lag in response, and realizes the following and support of ultra-long plates, with a high degree of automation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the control system of the present invention;

[0012] In the diagram: 1. Servo cylinder; 2. First sensor; 3. First pressure measuring device; 4. Overlay pressure reducing valve; 5. Overlay one-way B-port check valve; 6. Overlay one-way A-port check valve; 7. Three-position four-way proportional directional valve; 8. Hydraulic station; 9. Second sensor; 10. Two-position four-way directional valve; 11. Second pressure measuring device; 12. Integrated multi-channel oil block; 13. Third pressure measuring device; 14. Third sensor. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] like Figure 1 As shown, a control system for a novel ultra-long pressure-holding follow-up proportional servo cylinder consists of a hydraulic station 8, a servo cylinder 1, an integrated multi-way hydraulic block 12, and hydraulic valves. The hydraulic station 8 is equipped with interfaces P and T. The servo cylinder 1 is connected to the integrated multi-way hydraulic block 12 via pipelines. The integrated multi-way hydraulic block 12 is connected to a stacked pressure-reducing valve 4 and a two-position four-way directional valve 10, respectively. The stacked pressure-reducing valve 4 is connected to a stacked one-way B-port check valve 5. The stacked one-way B-port check valve 5 is connected to a stacked one-way A-port check valve 6. The stacked one-way A-port check valve 6 is connected to a three-position four-way proportional directional valve 7. The P port of the hydraulic station 8 is connected to the P1 port of the integrated multi-way hydraulic block 12, with the P1 port simultaneously divided into two channels. The first path and the outlet of the superimposed pressure reducing valve 4 are connected to the P port of the three-position four-way proportional directional valve 7. The A port of the three-position four-way proportional directional valve 7 is connected to the inlet of the superimposed one-way A-port check valve 6, and its outlet is connected to the A1 port of the integrated multi-way oil block 12. The A1 port is connected to the rodless chamber of the servo cylinder 1. The A1 port has two parallel paths: the first path is connected to the first pressure measuring device 3, and the second path is connected to the first sensor 2. At the same time, the B port of the three-position four-way proportional directional valve 7 is connected to the inlet of the superimposed one-way B-port check valve 5, and its outlet is connected to the B1 port of the integrated multi-way oil block 12. The B1 port is connected to the rod chamber of the servo cylinder. The B1 port has two parallel paths: the first path is connected to the third pressure measuring device 13, and the second path is connected to the third sensor 14.

[0015] The P1 of the integrated multi-path oil block 12 is connected to the P port of the two-position four-way directional valve 10, the A port of the two-position four-way directional valve 10 is connected to the A2 port of the integrated multi-path oil block 12, the B port of the two-position four-way directional valve 10 is connected to the B2 port of the integrated multi-path oil block 12, the outlet of the B2 port is divided into two paths, the first path is connected to the control port of the superimposed one-way A port one-way valve 6, the second path is connected to the control port of the superimposed one-way B port one-way valve 5; the measuring port M of the superimposed pressure reducing valve 4 is divided into two paths, the first path is connected to the second sensor 9, the second path is connected to the second pressure measuring device 11.

[0016] According to the principle, the debugging process of the superimposed pressure reducing valve 4 is briefly described, the pressure regulating handle of the superimposed pressure reducing valve 4 is rotated clockwise to the bottom, the rest of the electromagnetic valves are not electrified, the pressure display of the pressure gauge is observed through the second pressure measuring device 11, the pressure regulating handle of the superimposed pressure reducing valve 4 is adjusted until the pressure reaches the design requirement; the pressure detection of the rod cavity and the rodless cavity of the servo oil cylinder 1 is displayed through the respective pressure detection, the servo oil cylinder 1 is automatically completed according to the electric signal given by the machine tool to complete the servo oil cylinder 1 follow-up supporting action.

[0017] The above is only the preferred example of the present application. It should be noted that for ordinary skilled in the art, under the technical inspiration provided by the present application, as the common knowledge in the mechanical field, other equivalent variants and improvements can also be made, which should also be considered as the protection scope of the present application.

Claims

1. A control system for an over-hold follow-up proportional servo cylinder, characterized in that: The hydraulic station (8) is provided with a T interface and a P interface, the P interface is connected with a P1 interface of the integrated multi-way oil block (12) through a pipeline, the P1 interface is divided into two ways, one way of the P1 interface is connected with an outlet of the superimposed pressure reducing valve (4), an inlet of the superimposed pressure reducing valve (4) is connected with a P port of the three-position four-way proportional directional valve (7) through a pipeline, an A port of the three-position four-way proportional directional valve (7) is connected to an inlet of the superimposed one-way A port one-way valve (6), an outlet of the superimposed one-way A port one-way valve (6) is connected to an A1 port of the integrated multi-way oil block (12), the A1 port of the integrated multi-way oil block (12) is connected with a rodless cavity of the servo oil cylinder (1), and the A1 port of the integrated multi-way oil block (12) is connected with two ways in parallel, a first way is connected with the first pressure measuring device (3), and a second way is connected with the first sensor (2); meanwhile, a B port of the three-position four-way proportional directional valve (7) is connected to an inlet of the superimposed one-way B port one-way valve (5) through a pipeline, an outlet of the superimposed one-way B port one-way valve (5) is connected to a B1 port of the integrated multi-way oil block (12), the B1 port of the integrated multi-way oil block (12) is connected with a rod cavity of the servo oil cylinder (1), and the B1 port of the integrated multi-way oil block (12) is connected with two ways in parallel, a first way is connected with the third pressure measuring device (13), and a second way is connected with the third sensor (14); the other way of the P1 interface of the integrated multi-way oil block (12) is connected with a P port of the two-position four-way directional valve (10), an A port of the two-position four-way directional valve (10) is connected to an A2 port of the integrated multi-way oil block (12), meanwhile, a B port of the two-position four-way directional valve (10) is connected to a B2 port of the integrated multi-way oil block (12), the B2 port of the integrated multi-way oil block (12) is divided into two ways, a first way is connected to a control port of the superimposed one-way A port one-way valve (6), and a second way is connected to a control port of the superimposed one-way B port one-way valve (5); a pressure measuring port M of the superimposed pressure reducing valve (4) is divided into two ways, a first way is connected with the second sensor (9), and a second way is connected with the second pressure measuring device (11).

2. The control system of an over-length hold-on follow-up proportional servo oil cylinder according to claim 1, wherein: The superimposed pressure reducing valve (4) is connected with the superimposed one-way B port one-way valve (5); the superimposed one-way B port one-way valve (5) is connected with the superimposed one-way A port one-way valve (6).

3. The control system of an over-length holding follow-up proportional servo oil cylinder according to claim 1 or 2, characterized in that: The T port of the hydraulic station (8) is connected with a T1 port of the integrated multi-way oil block (12) through a pipeline, the T1 port of the integrated multi-way oil block (12) is divided into two ways, one way is connected with a T port of the two-position four-way directional valve (10), and the other way is connected with a T2 port of the integrated multi-way oil block (12).

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