Control system and method for synchronous compensation of moving beam speed of water-to-oil die forging press

Abstract

The present invention belongs to the technical field of metallurgical equipment, and specifically relates to a control system and method for synchronous compensation of the speed of a moving beam of a water-to-oil die forging press. The synchronous compensation control mechanism for the speed of a moving beam of the present invention comprises a moving beam, a beam synchronous control cylinder connected to the four corners of the moving beam, a moving beam position detection device respectively arranged at the four corners of the moving beam, a control valve group A, a control valve group B, a hydraulic pipeline, a first oil pump, a second oil pump, an oil tank and a PLC controller, and the PLC controller is respectively connected to the four moving beam position detection devices, the control valve group A, the control valve group B, the first oil pump and the second oil pump by electrical signals. During the movement of the moving beam of a large die forging press, the present invention controls the beam synchronous control cylinders on the diagonal of the moving beam in groups through the PLC controller, thereby eliminating the warping of a single corner of the moving beam, making the four corners of the moving beam move synchronously, and effectively improving the forging accuracy of the die forging press.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to a speed synchronous compensation control system and method for a moving crossbeam of a water-to-oil die forging press. Background Art

[0002] After years of use, the 300MN hydraulic press, a national treasure-level equipment, has high energy consumption and low precision. In particular, the hydraulic system parts are easily damaged, and the operating environment is poor. After upgrading to hydraulic drive, energy consumption will be greatly reduced, equipment precision will be improved, and reliability will be improved. However, the geometric dimensions of the moving beam of the large-scale forging press are very large, up to more than 10 meters. When driven by four cylinders, the resistance of each corner is different, which will lead to inconsistent cylinder movement speed. Summary of the invention

[0003] The invention provides a synchronous compensation control system and method for the speed of a moving crossbeam of a water-to-oil die forging press, aiming to synchronously and coordinately control the speed of the moving crossbeam to meet the precision requirements of a large die forging press.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The synchronous compensation control system for the speed of the moving beam of a water-to-oil die forging press comprises at least a moving beam, and also comprises four synchronous control cylinders for the beam, four position detection devices for the moving beam, a control valve group A, a control valve group B, a hydraulic pipeline, a first oil pump, a second oil pump and an oil tank; the output ends of the four synchronous control cylinders for the beam are respectively fixed on the lower surface of the four corners of the moving beam; the four position detection devices for the moving beam are arranged at the four corners of the moving beam; the control valve group A and the control valve group B have the same structure, and each control valve group is connected to the upper cavity and the lower cavity of the two synchronous control cylinders for the beam on the diagonal line of the moving beam through a hydraulic pipeline; the first oil pump and the second oil pump connect the oil tank to the control valve group A and the control valve group B through hydraulic pipelines respectively.

[0006] It also includes a PLC controller; the PLC controller is respectively connected with four moving beam position detection devices, control valve group A, control valve group B, the first oil pump and the second oil pump by electrical signals.

[0007] The control valve group A comprises a first proportional flow valve, a system pressure regulating valve, a second proportional flow valve, a reference pressure valve, a one-way valve, a pump head circulation valve, an oil circuit P1 inlet valve, an oil circuit P1 discharge valve, an oil circuit P2 inlet valve, an oil circuit P2 discharge valve, an oil circuit P2 and an oil circuit P1; the input ends of the pump head circulation valve, the system pressure regulating valve and the reference pressure valve are all connected to the oil tank through the first oil pump; the output end of the pump head circulation valve is respectively connected to the input end of the first proportional flow valve, the input end of the second proportional flow valve and the oil tank. The output end of the first proportional flow valve is connected to the oil circuit P1 inlet valve and the oil circuit P2 inlet valve through a one-way valve, the output end of the oil circuit P1 inlet valve is connected to the oil circuit P1 through the oil circuit P1 drain valve, and the output end of the oil circuit P2 inlet valve is connected to the oil circuit P2 through the oil circuit P2 drain valve; the oil circuit P1 is connected to the upper chamber of the synchronous control cylinder of one of the beams located on the diagonal of the moving beam, and the oil circuit P2 is connected to the lower chamber of the synchronous control cylinder of another beam located on the diagonal of the moving beam.

[0008] The output pipelines of the oil circuit P1 drain valve and the oil circuit P2 drain valve are respectively provided with an oil circuit P1 safety valve and an oil circuit P2 safety valve.

[0009] The four crossbeam synchronous control cylinders are all identical double-output shaft cylinders.

[0010] The shaft extension dimensions and sizes of the two ends of the four crossbeam synchronous control oil cylinders are all the same.

[0011] The movable beam position detection device adopts a displacement sensor.

[0012] The control method of the synchronous compensation control system for the moving crossbeam speed of the water-to-oil die forging press comprises the following steps:

[0013] Step 1: The first moving beam synchronous control oil cylinder, the third moving beam synchronous control oil cylinder, the second moving beam synchronous control oil cylinder and the fourth moving beam synchronous control oil cylinder are respectively arranged at the diagonal of the moving beam diagonal line;

[0014] Step 2: When the moving beam is unloaded and downward and in a horizontal state, proceed to step 3; when the moving beam is unloaded and downward and the moving beam is tilted, proceed to step 4; when the moving beam is pressurized and in a horizontal state, proceed to step 5; when the moving beam is pressurized and the moving beam is tilted, proceed to step 6;

[0015] Step 3: The PLC controller controls the pump head circulation valve to open, the oil pump is unloaded, the oil circuit P1 liquid inlet valve, oil circuit P1 liquid discharge valve, oil circuit P2 liquid inlet valve, and oil circuit P2 liquid discharge valve are all closed, oil circuits P1 and P2 are closed, and the reference pressure valve is set to high pressure, so that the two synchronous control cylinders on the diagonal line have the same reference pressure;

[0016] Step 4: When the PLC controller receives a signal that the moving beam is tilted as detected by the moving beam position detection device, if it is determined that the tilt exceeds a predetermined value, the PLC controller sends a command to the control valve group connected to the high-position beam synchronous control cylinder, the inlet valve of the corresponding oil circuit on the control valve group is opened, the discharge valve of another oil circuit on the control valve group is opened, the pump head circulation valve is closed, the system pressure regulating valve is adjusted to low pressure, the first low-pressure proportional flow valve is given a maximum value, the second proportional flow valve is given a compensation value, the reference pressure valve is adjusted to low pressure, and no-load compensation is started, and the pressure of the upper chamber of the high-position beam synchronous control cylinder and the lower chamber of the low-position beam synchronous control cylinder are adjusted to reduce the tilt value of the moving beam; when the moving beam is in a horizontal state again, the pump head circulation valve is opened, the discharge valve of the oil circuit P2 is closed, the inlet valve of the oil circuit P1 is closed, the no-load compensation is stopped, and the reference pressure valve is adjusted to high pressure;

[0017] Step 5: The pump head circulation valve is opened, the oil pump is unloaded, the oil circuit P1 inlet valve, oil circuit P1 discharge valve, oil circuit P2 inlet valve, and oil circuit P2 discharge valve are all closed, oil circuits P1 and P2 are closed, and the reference pressure valve is set to high pressure, so that the two synchronous control cylinders on the diagonal line have the same reference pressure;

[0018] Step six: When the PLC controller receives a signal that the moving beam is tilted as detected by the moving beam position detection device, if it is determined that the tilt exceeds a predetermined value, the PLC controller sends a command to the control valve group connected to the high-position beam synchronous control cylinder, the inlet valve of the corresponding oil circuit on the control valve group is opened, the drain valve of another oil circuit on the control valve group is opened, the pump head circulation valve is closed, the system pressure regulating valve is adjusted to high pressure, the second pressure proportional flow valve is given a maximum value, the first proportional flow valve is given a compensation value, the reference pressure valve is adjusted to low pressure, and pressure compensation is started, and the pressure in the upper chamber of the high-position beam synchronous control cylinder and the lower chamber of the low-position beam synchronous control cylinder are adjusted to reduce the tilt value of the moving beam; when the moving beam is in a horizontal state again, the pump head circulation valve is opened, the drain valve of the oil circuit P2 is closed, the inlet valve of the oil circuit P1 is closed, the pressure compensation is stopped, and the reference pressure valve is adjusted to high pressure.

[0019] Beneficial effects:

[0020] The present invention uses a PLC controller to group control the beam synchronization control cylinders on the diagonal of the moving beam, so that during the movement of the moving beam of a large die forging press, the warping of a single corner of the moving beam is eliminated, the four corners of the moving beam are moved synchronously, and the forging accuracy of the die forging press is effectively improved.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the control principle of the synchronous control of the moving beam of the present invention;

[0024] Figure 2 It is a schematic diagram of the synchronous control structure of the movable crossbeam of the present invention.

[0025] In the figure: 1-moving beam; 2-first moving beam synchronous control cylinder; 3-second moving beam synchronous control cylinder; 4-third moving beam synchronous control cylinder; 5-fourth moving beam synchronous control cylinder; 6-first oil pump; 7-first proportional flow valve; 8-system pressure regulating valve; 9-second proportional flow valve; 10-reference pressure valve; 11-check valve; 12-pump head circulation valve; 13-oil circuit P1 inlet valve; 14-oil circuit P1 discharge valve; 15-oil circuit P2 inlet valve; 16-oil circuit P2 discharge valve; 17-oil circuit P2 safety valve; 18-oil circuit P1 safety valve; 19-second oil pump; 20-oil tank; 2a. first moving beam position detection device, 3a. second moving beam position detection device, 4a. third moving beam position detection device C, 5a. fourth moving beam position detection device. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1:

[0028] Reference Figure 1 and Figure 2 The shown water-to-oil die forging press moving beam speed synchronous compensation control system includes at least a moving beam 1, and also includes four beam synchronous control cylinders, four moving beam position detection devices, a control valve group A, a control valve group B, a hydraulic pipeline, a first oil pump 6, a second oil pump 19 and an oil tank 20; the output ends of the four beam synchronous control cylinders are respectively fixed on the lower surface of the four corners of the moving beam 1; the four moving beam position detection devices are arranged at the four corners of the moving beam 1; the control valve group A and the control valve group B have the same structure, and each control valve group is connected to the upper cavity and the lower cavity of the two beam synchronous control cylinders on the diagonal line of the moving beam 1 through hydraulic pipelines; the first oil pump 6 and the second oil pump 19 connect the oil tank 20 with the control valve group A and the control valve group B through hydraulic pipelines.

[0029] In the technical solution of the present invention, four beam synchronization control cylinders are arranged on the four corners of the moving beam 1 to drive the moving beam 1. Four moving beam position detection devices are arranged on the four corners of the moving beam to detect the real-time displacement of the four corners; two diagonal beam synchronization control cylinders of the four beam synchronization control cylinders are controlled by the same control valve group, and the two diagonal beam synchronization control cylinders can coordinate and control the flipping of the diagonal of the moving beam 1; the two control valve groups are respectively fixedly installed on the oil tank 20 and connected to the beam synchronization control cylinders through hydraulic pipelines; the first oil pump 6 and the second oil pump 19 are arranged on the side of the oil tank and connected to the oil tank 20 and the two control valve groups through hydraulic pipelines.

[0030] During the movement of the mobile crossbeam 1, if the movement is smooth and the data detected by the position detection devices of the four corners are almost the same, no adjustment is required; if during the operation, there is an asynchronism, that is, the detection data of the four corners exceeds the allowable error range, then the mobile crossbeam 1 is adjusted synchronously. The specific adjustment is to adjust the two crossbeam synchronous control cylinders on the diagonal together according to the difference in data. If one of them is tilted upward, the crossbeam synchronous control cylinder that controls this corner will pull this corner downward, and the diagonal cylinder will push the diagonal corner upward, thereby eliminating the upward tilting trend. If it is tilted downward, the corner cylinder will push this corner upward, and the diagonal cylinder will pull the diagonal corner downward, thereby eliminating the downward tilting trend; through this control, the mobile crossbeam can move smoothly, effectively improving the forging accuracy of the die forging press.

[0031] Embodiment 2:

[0032] Reference Figure 1 and Figure 2The water-to-oil die forging press moving beam speed synchronous compensation control system shown, based on embodiment one, also includes a PLC controller; the PLC controller is respectively connected to the four moving beam position detection devices, control valve group A, control valve group B, the first oil pump 6 and the second oil pump 19 with electrical signals.

[0033] In actual use, the setting of the PLC controller improves the automation level of synchronous compensation of the moving beam speed and effectively improves the forging accuracy of the die forging press.

[0034] Embodiment three:

[0035] Reference Figure 1 and Figure 2 The synchronous compensation control system for the speed of the moving crossbeam of the water-to-oil die forging press shown in the figure is based on the first embodiment: the control valve group A includes a first proportional flow valve 7, a system pressure regulating valve 8, a second proportional flow valve 9, a reference pressure valve 10, a one-way valve 11, a pump head circulation valve 12, an oil circuit P1 inlet valve 13, an oil circuit P1 discharge valve 14, an oil circuit P2 inlet valve 15, an oil circuit P2 discharge valve 16, an oil circuit P2 and an oil circuit P1; the input ends of the pump head circulation valve 12, the system pressure regulating valve 8 and the reference pressure valve 10 are all connected to the oil tank 20 through the first oil pump 6; the output ends of the pump head circulation valve 12 are respectively connected to the ... and a second proportional flow valve 9, a reference pressure valve 10, a one-way valve 11, a pump head circulation valve 12, an oil circuit P1 inlet valve 13, an oil circuit P1 discharge valve 14, an oil circuit P2 inlet valve 15, an oil circuit P2 discharge valve 16, an oil circuit P2 and an oil circuit P1 The input end of the flow valve 7, the input end of the second proportional flow valve 9 and the oil tank 20 are connected; the output end of the first proportional flow valve 7 is connected with the oil circuit P1 inlet valve 13 and the oil circuit P2 inlet valve 15 through the one-way valve 11, the output end of the oil circuit P1 inlet valve 13 is connected with the oil circuit P1 through the oil circuit P1 drain valve 14, and the output end of the oil circuit P2 inlet valve 15 is connected with the oil circuit P2 through the oil circuit P2 drain valve 16; the oil circuit P1 is connected with the upper cavity of the synchronous control cylinder of one of the beams located on the diagonal line of the moving beam 1, and the oil circuit P2 is connected with the lower cavity of the synchronous control cylinder of another beam located on the diagonal line of the moving beam 1.

[0036] In actual use, the four beam synchronous control cylinders, namely the first moving beam synchronous control cylinder 2, the second moving beam synchronous control cylinder 3, the third moving beam synchronous control cylinder 4 and the fourth moving beam synchronous control cylinder 5, are respectively arranged at the diagonals of the diagonal of the moving beam 1; when the moving beam 1 is unloaded and pointing downward and the moving beam 1 is in a horizontal state, the PLC controller controls the pump head circulation valve 12 to open, the oil pump 6 is unloaded, the oil circuit P1 inlet valve 13, the oil circuit P1 discharge valve 14, the oil circuit P2 inlet valve 15, and the oil circuit P2 discharge valve 16 are all closed, the oil circuits P1 and P2 are closed, and the reference pressure valve 10 is set to high pressure, so that the two synchronous control cylinders on the diagonal have the same reference pressure. When the moving beam 1 is unloaded and downward and the moving beam 1 is tilted, when the PLC controller receives the signal that the moving beam 1 is tilted detected by the moving beam position detection device, if it is judged that the tilt exceeds the predetermined value, the PLC controller sends an instruction to the control valve group of the beam synchronous control cylinder connected to the high position, the inlet valve of the corresponding oil circuit on the control valve group is opened, the discharge valve of another oil circuit on the control valve group is opened, the pump head circulation valve 12 is closed, the system pressure regulating valve 8 is adjusted to low pressure, the first low-pressure proportional flow valve 7 is given the maximum value, the second proportional flow valve 9 is given the compensation value, and the reference pressure valve 10 is adjusted to low pressure, and the no-load compensation starts. The compensation method for the second proportional flow valve 9 given the compensation value is as follows: set the no-load tilt value and the balance value, when the no-load tilt value exceeds 1.2mm, the compensation system is started, and when the tilt value is less than 0.3mm, it is considered that the balance has been reached. In this adjustment process, the valve 9 gives a large value at the beginning, and the value given by the valve 9 decreases as the tilt value decreases. The specific given compensation value should be debugged according to the no-load speed of the moving beam. Then adjust the pressure of the upper chamber of the horizontal beam synchronous control cylinder located at a high position and the lower chamber of the horizontal beam synchronous control cylinder located at a low position to reduce the tilt value of the moving horizontal beam 1; when the moving horizontal beam 1 is in a horizontal state again, the pump head circulation valve 12 is opened, the oil circuit P2 discharge valve 16 is closed, and the oil circuit P1 inlet valve 13 is closed, the no-load compensation is stopped, and the reference pressure valve 10 is adjusted to high pressure. When the moving horizontal beam 1 is pressurized and the moving horizontal beam 1 is in a horizontal state, the pump head circulation valve 12 is opened, the oil pump 6 is unloaded, the oil circuit P1 inlet valve 13, the oil circuit P1 discharge valve 14, the oil circuit P2 inlet valve 15, and the oil circuit P2 discharge valve 16 are all closed, the oil circuits P1 and P2 are closed, and the reference pressure valve 10 is set to high pressure, so that the two synchronous control cylinders on the diagonal line have the same reference pressure.When the moving beam 1 is pressurized and the moving beam 1 tilts, when the PLC controller receives the signal that the moving beam 1 tilts detected by the moving beam position detection device, if it is judged that the tilt exceeds the predetermined value, the PLC controller sends an instruction to the control valve group connected to the high-position beam synchronous control cylinder, the inlet valve of the corresponding oil circuit on the control valve group is opened, the discharge valve of another oil circuit on the control valve group is opened, the pump head circulation valve 12 is closed, the system pressure regulating valve 8 is adjusted to high pressure, the second pressure proportional flow valve 9 is given the maximum value, the first proportional flow valve 7 is given the compensation value, and the reference pressure valve 10 is adjusted to low pressure, and the pressure compensation begins. The compensation method for the first proportional flow valve 7 to give the compensation value is as follows: set the load tilt value and the balance value, when the load tilt value exceeds 0.8mm, the compensation system is started, and when the tilt value is less than 0.3mm, it is considered that the balance has been reached. In this adjustment process, valve 7 gives a large value at the beginning, and the value given by valve 7 decreases as the tilt value decreases. The specific given value should be debugged according to the load speed of the moving beam. Subsequently, the pressure in the upper chamber of the synchronous control cylinder of the beam in the high position and the pressure in the lower chamber of the synchronous control cylinder of the beam in the low position are adjusted to reduce the inclination value of the moving beam 1; when the moving beam 1 is in a horizontal state again, the pump head circulation valve 12 is opened, the oil circuit P2 drain valve 16 is closed, and the oil circuit P1 inlet valve 13 is closed, the pressurization compensation is stopped, and the reference pressure valve 10 is adjusted to high pressure.

[0037] The present invention uses a PLC controller to group the beam synchronization control cylinders on the diagonal of the moving beam 1, so that during the movement of the moving beam of a large die forging press, the warping of a single corner of the moving beam is eliminated, and the four corners of the moving beam are moved synchronously, which effectively improves the forging accuracy of the die forging press.

[0038] Embodiment 4:

[0039] Reference Figure 1 and Figure 2 The synchronous compensation control system for the moving crossbeam speed of the water-to-oil die forging press shown is based on the third embodiment: the output pipelines of the oil circuit P1 drain valve 14 and the oil circuit P2 drain valve 16 are respectively provided with an oil circuit P1 safety valve 18 and an oil circuit P2 safety valve 17.

[0040] In specific applications, the settings of the oil circuit P1 safety valve 18 and the oil circuit P2 safety valve 17 can give appropriate adjustment values ​​according to the mechanical design pressure of the beam synchronous control cylinder to prevent the beam synchronous control cylinder from being damaged by overpressure.

[0041] Embodiment five:

[0042] Reference Figure 1 and Figure 2 The water-to-oil die forging press moving crossbeam speed synchronous compensation control system shown is based on Example 1: the four crossbeam synchronous control cylinders are all identical dual-output shaft cylinders.

[0043] Furthermore, the shaft extension dimensions and sizes at both ends of the four crossbeam synchronous control cylinders are the same.

[0044] In actual use, the four crossbeam synchronous control cylinders adopt this technical solution, making the adjustment simpler and more accurate.

[0045] Embodiment six:

[0046] Reference Figure 1 and Figure 2 The synchronous compensation control system for the speed of the moving crossbeam of the water-to-oil die forging press shown is based on the first embodiment: the moving crossbeam position detection device adopts a displacement sensor.

[0047] In actual use, the mobile crossbeam position detection device adopts this technical solution, which can not only meet the detection requirements but also save costs.

[0048] The displacement sensor in this embodiment is a displacement sensor of model PB-S-1900M-D63-1-P102 produced by MTS.

[0049] Embodiment seven:

[0050] Reference Figure 1 and Figure 2 The control method of the synchronous compensation control system for the moving crossbeam speed of the water-to-oil die forging press shown in the figure comprises the following steps:

[0051] Step 1: arrange the first moving beam synchronous control cylinder 2, the third moving beam synchronous control cylinder 4, the second moving beam synchronous control cylinder 3 and the fourth moving beam synchronous control cylinder 5 of the four beam synchronous control cylinders, i.e., the first moving beam synchronous control cylinder 2, the third moving beam synchronous control cylinder 4, the second moving beam synchronous control cylinder 3 and the fourth moving beam synchronous control cylinder 5 respectively at the diagonals of the moving beam 1;

[0052] Step 2: When the moving beam 1 is unloaded and downward and in a horizontal state, proceed to step 3; when the moving beam 1 is unloaded and downward and the moving beam 1 is tilted, proceed to step 4; when the moving beam 1 is pressurized and in a horizontal state, proceed to step 5; when the moving beam 1 is pressurized and the moving beam 1 is tilted, proceed to step 6;

[0053] Step 3: The PLC controller controls the pump head circulation valve 12 to open, the oil pump 6 is unloaded, the oil circuit P1 liquid inlet valve 13, the oil circuit P1 liquid discharge valve 14, the oil circuit P2 liquid inlet valve 15, and the oil circuit P2 liquid discharge valve 16 are all closed, the oil circuits P1 and P2 are closed, and the reference pressure valve 10 is set to high pressure, so that the two synchronous control cylinders on the diagonal line have the same reference pressure;

[0054] Step 4: When the PLC controller receives a signal that the moving beam 1 is tilted as detected by the moving beam position detection device, if it is determined that the tilt exceeds a predetermined value, the PLC controller sends a command to the control valve group connected to the high-position beam synchronous control cylinder, the inlet valve of the corresponding oil circuit on the control valve group is opened, the discharge valve of another oil circuit on the control valve group is opened, the pump head circulation valve 12 is closed, the system pressure regulating valve 8 is adjusted to low pressure, the first low-pressure proportional flow valve 7 is given a maximum value, the second proportional flow valve 9 is given a compensation value, and the reference pressure valve 10 is adjusted to low pressure, and no-load compensation starts, and the pressure of the upper chamber of the high-position beam synchronous control cylinder and the lower chamber of the low-position beam synchronous control cylinder are adjusted to reduce the tilt value of the moving beam 1; when the moving beam 1 is in a horizontal state again, the pump head circulation valve 12 is opened, the oil circuit P2 discharge valve 16 is closed, and the oil circuit P1 inlet valve 13 is closed, the no-load compensation is stopped, and the reference pressure valve 10 is adjusted to high pressure;

[0055] Step 5: The pump head circulation valve 12 is opened, the oil pump 6 is unloaded, the oil circuit P1 liquid inlet valve 13, the oil circuit P1 liquid discharge valve 14, the oil circuit P2 liquid inlet valve 15, and the oil circuit P2 liquid discharge valve 16 are all closed, the oil circuits P1 and P2 are closed, and the reference pressure valve 10 is set to high pressure, so that the two synchronous control cylinders on the diagonal line have the same reference pressure;

[0056] Step six: When the PLC controller receives a signal that the moving beam 1 is tilted as detected by the moving beam position detection device, if it is determined that the tilt exceeds a predetermined value, the PLC controller sends an instruction to the control valve group connected to the high-position beam synchronous control cylinder, the inlet valve of the corresponding oil circuit on the control valve group is opened, the drain valve of another oil circuit on the control valve group is opened, the pump head circulation valve 12 is closed, the system pressure regulating valve 8 is adjusted to high pressure, the second pressure proportional flow valve 9 is given a maximum value, the first proportional flow valve 7 is given a compensation value, the reference pressure valve 10 is adjusted to low pressure, and pressure compensation is started, and the pressure in the upper chamber of the high-position beam synchronous control cylinder and the lower chamber of the low-position beam synchronous control cylinder are adjusted to reduce the tilt value of the moving beam 1; when the moving beam 1 is in a horizontal state again, the pump head circulation valve 12 is opened, the drain valve 16 of the oil circuit P2 is closed, and the inlet valve 13 of the oil circuit P1 is closed, the pressure compensation is stopped, and the reference pressure valve 10 is adjusted to high pressure.

[0057] In actual use, the technical solution of the present invention is adopted to eliminate the warping of a single corner of the moving beam during the movement of the moving beam of a large die forging press, so that the four corners of the moving beam move synchronously, effectively improving the forging accuracy of the die forging press and improving the quality of the product.

[0058] Embodiment eight:

[0059] Reference Figure 1 and Figure 2The control method of the synchronous compensation control system of the moving crossbeam speed of the water-to-oil die forging press shown in the figure.

[0060] The movable crossbeam 1 is provided with four identical synchronous control cylinders, which are double-output shaft cylinders with the same shaft extension size and size at both ends. The movable crossbeam 1 has four position sensor devices, which are respectively arranged at the four corners of the movable crossbeam. The first synchronous control cylinder 2, the first movable crossbeam position detection device 2a and the fourth synchronous control cylinder 5, the fourth position sensor device 5a are distributed at one diagonal of the movable crossbeam, and the second synchronous control cylinder 3, the second position sensor device 3a and the third synchronous control cylinder 4, the third position sensor device 4a are distributed at the other diagonal of the movable crossbeam 1.

[0061] like Figure 2 As shown, the first proportional flow valve 7, the system pressure regulating valve 8, the second proportional flow valve 9, the reference pressure valve 10, the one-way valve 11, the pump head circulation valve 12, the oil circuit P1 inlet valve 13, the oil circuit P1 discharge valve 14, the oil circuit P2 inlet valve 15, the oil circuit P2 discharge valve 16, the oil circuit P2 safety valve 17, and the oil circuit P1 safety valve 18 constitute the control valve group A, and the completely identical control valves constitute the control valve group B. The control valve group A, the control valve group B, the first oil pump 6, the second oil pump 19, the oil tank 20 and various pipelines constitute the entire control system. The control system forms four control oil circuits P1, P2, P3, and P4, and the oil circuits P1 and P3 are completely identical, and the oil circuits P2 and P4 are completely identical.

[0062] like Figure 1 and Figure 2 As shown, the second movable beam synchronous control oil cylinder 3 and the third movable beam synchronous control oil cylinder 4 are located at an opposite corner of the movable beam 1, and the upper chamber of the second movable beam synchronous control oil 3 and the lower chamber of the third movable beam synchronous control oil cylinder 4 are both connected to the oil circuit P1, and the lower chamber of the second movable beam synchronous control oil 3 and the upper chamber of the third movable beam synchronous control oil cylinder 4 are the same as the oil circuit P2. If the oil circuit P1 is fed with oil and the oil circuit P2 is returned with oil, the movable beam 1 will generate a counterclockwise turning moment at the opposite corner. If the oil circuit P1 is returned with oil and the oil circuit P2 is fed with oil, the movable beam 1 will generate a clockwise turning moment at the opposite corner. The control of the movable beam 1 at another diagonal is the same as that of the diagonal.

[0063] like Figure 1As shown, the functions of each valve are as follows: the pump head circulation valve 12 is used to control the loading and unloading of the oil pump 6. The system pressure regulating valve 8 is used to adjust the system pressure, which has two pressures: high and low. The high pressure is used when the movable crossbeam is pressurized for compensation, and the low pressure is used when the no-load compensation is performed. The reference pressure valve 10 is used to set the system reference pressure, which is used when the system is closed and the low pressure is used when the system is compensated. The first proportional flow valve 7 is used to adjust the speed of the movable crossbeam pressurization compensation. The second proportional flow valve 9 is used to adjust the speed of the no-load compensation of the movable crossbeam 1. The one-way valve 11 prevents the flow of the circuit oil in the opposite direction. The oil circuit P1 inlet valve 13 controls the inlet of the oil circuit P1. The oil circuit P1 drain valve 14 controls the drain of the oil circuit P1. The oil circuit P2 inlet valve 15 controls the inlet of the oil circuit P2. The oil circuit P2 drain valve 16 controls the drain of the oil circuit P2. The oil circuit P1 safety valve 17 is used to limit the maximum pressure of the oil circuit P1. The oil circuit P2 safety valve 18 is used to limit the maximum pressure of the oil circuit P2.

[0064] The following takes the diagonal line where the synchronous control cylinder B and the synchronous control cylinder C of the moving beam 1 are located as an example to demonstrate the specific control process of the no-load speed synchronous compensation of the moving beam 1.

[0065] like Figure 1 and Figure 2 As shown, the moving beam 1 is unloaded and downward. When the moving beam 1 is in a horizontal state, the pump head circulation valve 12 is opened, the oil pump 6 is unloaded, the oil circuit P1 inlet valve 13, the oil circuit P1 discharge valve 14, the oil circuit P2 inlet valve 15, and the oil circuit P2 discharge valve 16 are all closed, the oil circuits P1 and P2 are closed, the reference pressure valve 10 is set to high pressure, and the second moving beam synchronous control cylinder 3 and the third moving beam synchronous control cylinder 4 have the same reference pressure (high). When the moving beam 1 tilts due to uneven force (such as clockwise rotation), the pressure of the upper chamber of the second moving beam synchronous control cylinder 3 and the lower chamber of the third moving beam synchronous control cylinder 4 increases due to the volume reduction, forming a counterclockwise balancing torque. When the tilt value exceeds the given value, the oil circuit P1 inlet valve 13 is opened, the oil circuit P2 discharge valve 16 is opened, the pump head circulation valve 12 is closed, the system pressure regulating valve 8 is adjusted to low pressure, the first proportional flow valve 7 is given the maximum value, the second proportional flow valve 9 is given the compensation value, and the reference pressure valve 10 is adjusted to low pressure. The compensation control system starts no-load compensation, the pressure of the upper chamber of the second moving beam synchronous control cylinder 3 and the lower chamber of the third moving beam synchronous control cylinder 4 continues to increase, the counterclockwise balancing torque increases, and the tilt value of the moving beam 1 decreases. The second proportional flow valve 9 gives a compensation value that is dynamically adjusted according to the tilt value. When the moving beam 1 is in a horizontal state again, the pump head circulation valve 12 is opened, the oil circuit P2 discharge valve 16 is closed, the oil circuit P1 inlet valve 13 is closed, the compensation control system stops no-load compensation, and the reference pressure valve 10 is adjusted to high pressure.

[0066] When the moving beam 1 is pressurized, if the moving beam 1 is in a horizontal state, the pump head circulation valve 12 is opened, the oil pump 6 is unloaded, the oil circuit P1 inlet valve 13, the oil circuit P1 discharge valve 14, the oil circuit P2 inlet valve 15, and the oil circuit P2 discharge valve 16 are all closed, the oil circuits P1 and P2 are closed, the reference pressure valve 10 is set to high pressure, and the second moving beam synchronous control cylinder 3 and the third moving beam synchronous control cylinder 4 have the same reference pressure (high). When the moving beam 1 is tilted by the forging eccentric torque (such as clockwise rotation), the pressure of the upper chamber of the second moving beam synchronous control cylinder 3 and the lower chamber of the third moving beam synchronous control cylinder 4 increases due to the volume reduction, forming a counterclockwise balancing torque. When the tilt value exceeds the given value, the oil circuit P1 inlet valve 13 is opened, the oil circuit P2 discharge valve 16 is opened, the pump head circulation valve 12 is closed, the system pressure regulating valve 8 is adjusted to high pressure, the second proportional flow valve 9 is given the maximum value, the first proportional flow valve 7 is given the compensation value, and the reference pressure valve 10 is adjusted to low pressure. The compensation control system starts pressurization compensation, and the pressure of the upper chamber of the second moving beam synchronous control cylinder 3 and the lower chamber of the third moving beam synchronous control cylinder 4 continues to increase, the counterclockwise balancing torque increases, and the tilt value of the moving beam 1 decreases. The compensation value given by the first proportional flow valve 7 is dynamically adjusted according to the tilt value. When the moving beam 1 is in a horizontal state again, the pump head circulation valve 12 is opened, the oil circuit P2 discharge valve 16 is closed, the oil circuit P1 inlet valve 13 is closed, the compensation control system stops pressurization compensation, and the reference pressure valve 10 is adjusted to high pressure.

[0067] The present invention accurately eliminates the warping of a single corner of the moving beam during the movement of the moving beam of the large die forging press, enables the four corners of the moving beam to move synchronously, and effectively improves the forging accuracy of the die forging press.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0069] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0070] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0071] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A synchronous compensation control system for the speed of a moving crossbeam of a water-to-oil die forging press, comprising at least a moving crossbeam (1), characterized in that: It also includes four crossbeam synchronous control cylinders, four movable crossbeam position detection devices, a control valve group A, a control valve group B, hydraulic pipelines, a first oil pump (6), a second oil pump (19) and an oil tank (20); the output ends of the four crossbeam synchronous control cylinders are respectively fixed to the lower surface of the four corners of the movable crossbeam (1); the four movable crossbeam position detection devices are arranged at the four corners of the movable crossbeam (1); the control valve group A and the control valve group B have the same structure, and each control valve group is connected to the upper chamber and the lower chamber of the two crossbeam synchronous control cylinders on the diagonal line of the movable crossbeam (1) through hydraulic pipelines; the first oil pump (6) and the second oil pump (19) respectively connect the oil tank (20) to the control valve group A and the control valve group B through hydraulic pipelines; It also includes a PLC controller; the PLC controller is respectively connected to the four movable crossbeam position detection devices, the control valve group A, the control valve group B, the first oil pump (6) and the second oil pump (19) by electrical signals; The control valve group A comprises a first proportional flow valve (7), a system pressure regulating valve (8), a second proportional flow valve (9), a reference pressure valve (10), a one-way valve (11), a pump head circulation valve (12), an oil circuit P1 inlet valve (13), an oil circuit P1 discharge valve (14), an oil circuit P2 inlet valve (15), an oil circuit P2 discharge valve (16), an oil circuit P2 and an oil circuit P1; the input ends of the pump head circulation valve (12), the system pressure regulating valve (8) and the reference pressure valve (10) are all connected to the oil tank (20) via the first oil pump (6); the output end of the pump head circulation valve (12) is respectively connected to the input end of the first proportional flow valve (7), the second proportional flow valve (9), and the reference pressure valve (10). The input end of the proportional flow valve (9) is connected to the oil tank (20); the output end of the first proportional flow valve (7) is connected to the oil circuit P1 inlet valve (13) and the oil circuit P2 inlet valve (15) through the one-way valve (11); the output end of the oil circuit P1 inlet valve (13) is connected to the oil circuit P1 through the oil circuit P1 discharge valve (14); the output end of the oil circuit P2 inlet valve (15) is connected to the oil circuit P2 through the oil circuit P2 discharge valve (16); the oil circuit P1 is connected to the upper chamber of one of the beam synchronous control cylinders located on the diagonal line of the moving beam (1), and the oil circuit P2 is connected to the lower chamber of the other beam synchronous control cylinder located on the diagonal line of the moving beam (1).

2. The synchronous compensation control system for the speed of the moving crossbeam of the water-to-oil die forging press according to claim 1, characterized in that: The output pipelines of the oil circuit P1 drain valve (14) and the oil circuit P2 drain valve (16) are respectively provided with an oil circuit P1 safety valve (18) and an oil circuit P2 safety valve (17).

3. The synchronous compensation control system for the speed of the moving crossbeam of the water-to-oil die forging press according to claim 1, characterized in that: The four crossbeam synchronous control cylinders are all identical double-output shaft cylinders.

4. The synchronous compensation control system for the speed of the moving crossbeam of the water-to-oil die forging press according to claim 3 is characterized in that: The shaft extension dimensions and sizes of the two ends of the four crossbeam synchronous control oil cylinders are all the same.

5. The synchronous compensation control system for the speed of the moving crossbeam of the water-to-oil die forging press according to claim 1, characterized in that: The movable beam position detection device adopts a displacement sensor.

6. The control method of the synchronous compensation control system for the moving crossbeam speed of the water-to-oil die forging press according to any one of claims 1 to 5, characterized in that: The following steps are included: Step 1: The first movable crossbeam synchronous control cylinder (2), the third movable crossbeam synchronous control cylinder (4), the second movable crossbeam synchronous control cylinder (3), the third movable crossbeam synchronous control cylinder (4) and the fourth movable crossbeam synchronous control cylinder (5) are respectively arranged at diagonals opposite to the diagonal line of the movable crossbeam (1); Step 2: when the moving beam (1) is unloaded and downward and in a horizontal state, proceed to step 3; when the moving beam (1) is unloaded and downward and the moving beam (1) is tilted, proceed to step 4; when the moving beam (1) is pressurized and in a horizontal state, proceed to step 5; when the moving beam (1) is pressurized and the moving beam (1) is tilted, proceed to step 6; Step 3: The PLC controller controls the pump head circulation valve (12) to open, the oil pump (6) to unload, the oil circuit P1 liquid inlet valve (13), the oil circuit P1 liquid discharge valve (14), the oil circuit P2 liquid inlet valve (15), and the oil circuit P2 liquid discharge valve (16) to close, the oil circuits P1 and P2 are closed, and the reference pressure valve (10) is set to high pressure, so that the two synchronous control cylinders on the diagonal line have the same reference pressure; Step 4: When the PLC controller receives a signal from the moving beam position detection device that the moving beam (1) is tilted, if it is determined that the tilt exceeds a predetermined value, the PLC controller sends a command to the control valve group connected to the high-position beam synchronous control cylinder, the inlet valve of the corresponding oil circuit on the control valve group is opened, the discharge valve of another oil circuit on the control valve group is opened, the pump head circulation valve (12) is closed, the system pressure regulating valve (8) is adjusted to a low pressure, the first proportional flow valve (7) is given a maximum value, the second proportional flow valve (9) is given a compensation value, and the reference pressure valve (10) is adjusted to a low pressure, and no-load compensation is started, and the pressure of the upper chamber of the high-position beam synchronous control cylinder and the lower chamber of the low-position beam synchronous control cylinder are adjusted to reduce the tilt value of the moving beam (1); when the moving beam (1) is in a horizontal state again, the pump head circulation valve (12) is opened, the discharge valve (16) of the oil circuit P2 is closed, and the inlet valve (13) of the oil circuit P1 is closed, the no-load compensation is stopped, and the reference pressure valve (10) is adjusted to a high pressure; Step 5: The pump head circulation valve (12) is opened, the oil pump (6) is unloaded, the oil circuit P1 liquid inlet valve (13), the oil circuit P1 liquid discharge valve (14), the oil circuit P2 liquid inlet valve (15), and the oil circuit P2 liquid discharge valve (16) are all closed, the oil circuits P1 and P2 are sealed, and the reference pressure valve (10) is set to high pressure, so that the two synchronous control cylinders on the diagonal line have the same reference pressure; Step 6: When the PLC controller receives a signal that the movable beam (1) is tilted as detected by the movable beam position detection device, if it is determined that the tilt exceeds a predetermined value, the PLC controller sends a command to the control valve group connected to the high-position horizontal beam synchronous control oil cylinder, the inlet valve of the corresponding oil circuit on the control valve group is opened, the discharge valve of another oil circuit on the control valve group is opened, the pump head circulation valve (12) is closed, the system pressure regulating valve (8) is adjusted to high pressure, the second proportional flow valve (9) is given a maximum value, the first proportional flow valve (7) is given a compensation value, and the reference pressure valve (10) is adjusted to low pressure, and pressure compensation is started, and the pressure of the upper chamber of the horizontal beam synchronous control oil cylinder at the high position and the lower chamber of the horizontal beam synchronous control oil cylinder at the low position are adjusted to reduce the tilt value of the movable beam (1); when the movable beam (1) is in a horizontal state again, the pump head circulation valve (12) is opened, the discharge valve (16) of the oil circuit P2 is closed, and the inlet valve (13) of the oil circuit P1 is closed, and the pressure compensation is stopped, and the reference pressure valve (10) is adjusted to high pressure.

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