Hydraulic control system and control method for plate straightening machine

Abstract

The invention discloses a hydraulic control system and method for a plate straightening machine, the hydraulic control system comprises a power module for providing power, a first one-way valve, a second one-way valve, a detection module, a proportional overflow valve, an energy accumulator and a control module, and one end of the first one-way valve is connected to the output end of the power module; one end of the second one-way valve is connected to the other end of the first one-way valve; the detection module and the second one-way valve are arranged in parallel for detecting the output pressure of the first outlet of the power module; an oil inlet of the proportional overflow valve is connected to a remote control port of the power module; the energy accumulator is connected to a first outlet pipeline of the power module through a hydraulic pipeline; the control module is connected with the power module and used for adjusting the rotating speed output by the power module, the control module is connected with the proportional overflow valve and used for adjusting the pressure of the proportional overflow valve, and the control module is connected with the other end of the detection module and used for receiving a detection signal of the detection module and adjusting the outlet pressure of the power module.

Description

Technical Field

[0001] The invention relates to the technical field of servo control of metallurgical equipment, and in particular to a hydraulic control system and a control method for a plate straightening machine. Background Art

[0002] The metallurgical industry is a typical high-energy-consuming industry with high energy consumption, especially the straightening equipment in the production lines of medium and thick plates, tube rolling mills, and metal pressure forming equipment.

[0003] Due to the large number of actuators of existing straightening machines and the complex process actions, the power device of the hydraulic system basically adopts the structure of a three-phase asynchronous motor driving a fixed displacement pump / variable displacement pump + hydraulic valve. After the asynchronous motor is turned on, the hydraulic system provides a constant flow at a constant speed. However, since the working pressure and load flow required for each operation of the hydraulic actuator are different, the redundant flow provided by the hydraulic system will overflow through the proportional relief valve. This process is high-pressure throttling, and the efficiency is generally 60%-70%, and the energy loss is as high as 30%-40%; secondly, since the hydraulic oil works in a high-pressure overflow state for a long time, the hydraulic system will have high noise, rapid oil temperature rise, serious aging of seals, and shortened life of mechanical equipment. In addition, there are inevitable disadvantages such as large motor size and large interference to the power grid, which bring great inconvenience to users' use and maintenance.

[0004] In order to solve the above-mentioned defects, a three-phase asynchronous motor is used to drive a variable pump. Although the flow supply has been improved, the variable pump displacement output cannot be completely zero, which greatly reduces the working efficiency of the motor. In addition, the asynchronous motor is not suitable for frequent starting and stopping, the motor has high noise, large size, and great interference to the power grid. Energy waste and difficulty in use and maintenance still exist. Summary of the invention

[0005] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a hydraulic control system and control method for a plate straightening machine, which can solve the problems of large installed power, low efficiency, fast heating and easy aging of components in the hydraulic system in the prior art, and can also solve the problems of high energy consumption and frequent equipment maintenance caused by long-term high pressure and large flow of different actuators and different process actions in the hydraulic control system.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention provides a hydraulic control system for a plate straightening machine, comprising:

[0008] A power module, used for providing power;

[0009] a first one-way valve, one end of which is connected to an output end of the power module through a hydraulic pipeline;

[0010] a second one-way valve, one end of which is connected to the other end of the first one-way valve;

[0011] a detection module, the detection module and the second one-way valve are arranged in parallel, one end of the detection module is connected to the hydraulic pipeline between the first one-way valve and the second one-way valve, and the detection module is used to detect the output pressure of the first outlet of the power module;

[0012] A proportional relief valve, wherein the oil inlet of the proportional relief valve is connected to the remote control port of the power module through a hydraulic pipeline, and the oil return port of the proportional relief valve is connected to the first oil tank;

[0013] An accumulator, the accumulator is connected to the first outlet pipeline of the power module through a hydraulic pipeline and is arranged in parallel with the first one-way valve; the accumulator is connected to the hydraulic pipeline between the output end of the power module and the first one-way valve through a hydraulic pipeline;

[0014] A control module, wherein the control module is connected to the power module and is used to adjust the rotational speed output by the power module. The control module is connected to the proportional relief valve and is used to adjust the pressure of the proportional relief valve. The control module is connected to the other end of the detection module and is used to receive the detection signal of the detection module and adjust the outlet pressure of the power module.

[0015] Furthermore, in the above-mentioned hydraulic control system of the plate straightening machine, the detection module includes a pressure sensor.

[0016] Furthermore, in the above-mentioned hydraulic control system of the plate straightening machine, the control module includes:

[0017] An interactive module, the interactive module is used to transmit flow instructions and pressure instructions to the control unit, and at the same time display the detection signal received by the control unit;

[0018] A control unit, the control unit is used to receive the signal detected by the detection module, and simultaneously receive the flow command and the pressure command transmitted by the interaction module, and perform pressure regulation on the proportional relief valve according to the flow command and the pressure command output by the interaction module;

[0019] A driver is used to control the rotation speed of the power module according to the feedback signal received by the control module from the detection module. The driver collects the system pressure of the hydraulic system and the real-time status of the power module to transmit to the control unit, so that the control unit transmits the straightening machine operation data to the interactive module for upper display after digital-to-analog conversion.

[0020] Furthermore, in the above-mentioned hydraulic control system of the plate straightening machine, the power module comprises:

[0021] A servo motor is connected to the driver via a cable, and is used to start and stop according to the start and stop instructions issued by the interactive module. At the same time, the servo motor is used to control the speed of the servo motor according to the pressure signal value output by the control unit to the driver, until the pressure detected by the detection module reaches the set value, the speed of the servo motor is automatically reduced to reduce energy output, and when the straightening machine needs to maintain pressure for a long time, the servo motor is controlled by the control unit to stop or enter a standby working state to reduce energy consumption.

[0022] A remote control variable pump, wherein the transmission shaft of the remote control variable pump is fixedly connected to the motor shaft of the servo motor, the inlet of the remote control variable pump is connected to the second oil tank, the first outlet of the remote control variable pump is connected to the hydraulic pipeline connecting the accumulator, the proportional relief valve, the detection module and the first one-way valve, the remote control port of the remote control variable pump is connected to the oil inlet of the proportional relief valve, and the second outlet of the remote control variable pump returns oil to the second oil tank.

[0023] Furthermore, in the above-mentioned plate straightening machine hydraulic control system, it also includes a stop valve, one end of which is connected to the accumulator through a hydraulic pipeline, and the other end of the stop valve is connected to the hydraulic pipeline of the first one-way valve connected to the first outlet of the power module.

[0024] Furthermore, in the above-mentioned plate straightening machine hydraulic control system, a safety valve is also arranged between the accumulator and the shut-off valve, one end of the safety valve is connected to the hydraulic pipeline connecting the accumulator and the shut-off valve through a hydraulic pipeline, and the other end of the safety valve is connected to the second oil tank.

[0025] Furthermore, in the above-mentioned hydraulic control system of the plate straightening machine, a damper is provided on the pipeline connecting the detection module to one end of the first one-way valve.

[0026] Furthermore, in the above-mentioned plate straightening machine hydraulic control system, it also includes an electromagnetic ball valve, the first oil inlet of the electromagnetic ball valve is connected to the hydraulic pipeline connecting the first one-way valve to the second one-way valve through a hydraulic pipeline intersection and is connected to the damper, the oil outlet of the electromagnetic ball valve is connected to the first oil tank, and the second oil inlet of the electromagnetic ball valve is connected to the oil inlet of the second one-way valve through a control pipeline.

[0027] Furthermore, in the above-mentioned hydraulic control system of the plate straightening machine, the variable pump includes a remote control constant pressure variable pump.

[0028] In a second aspect, the present invention further provides a control method using the above-mentioned plate straightening machine hydraulic control system, comprising:

[0029] Detect the outlet pressure of the straightening machine hydraulic pump and determine whether it reaches the preset value;

[0030] If the preset value is reached, the speed of the power module will be reduced or the hydraulic system will enter the pressure-maintaining state, causing the straightening machine to stop or enter the standby state;

[0031] If the preset value is not reached, the obtained hydraulic pump pressure data will be fed back to the control module. The control module will control the speed of the power module and the input electrical signal size of the proportional relief valve amplifier according to the obtained pressure data, and then adjust the outlet pressure of the remote-controlled constant pressure variable pump until the outlet pressure of the straightening machine hydraulic pump reaches the preset value.

[0032] The main advantages of the technical solution of the present invention are as follows:

[0033] The plate straightening machine hydraulic control system of the present invention starts the power module through the control module. At the same time, the control module controls the hydraulic system to give the analog signal to the proportional relief valve amplifier for pressure regulation, so that the outlet pressure of the power module is quickly adjusted to the given pressure, and the detected pressure signal is fed back to the control module through the detection module. The control module inputs the pressure signal to the driver, and the driver controls the rotation speed of the power module according to the input pressure signal value until the pressure of the detection module reaches the set value, and the rotation speed of the power module is automatically reduced, thereby reducing the energy output. When the straightening machine needs to maintain pressure for a long time, the servo motor can be controlled by the control module to shut down or enter the standby working state, further reducing energy consumption. The energy-saving stepless pressure regulation servo variable speed pump control system thus formed can better realize the precise pressure control and on-demand flow supply of the hydraulic system, reduce energy consumption, and efficiently, stably and accurately control various process actions of the straightening machine hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 A hydraulic principle diagram of a hydraulic control system for a plate straightening machine according to an embodiment of the present invention;

[0036] Figure 2 It is a schematic flow chart of a hydraulic control method for a plate straightening machine according to an embodiment of the present invention;

[0037] Description of reference numerals:

[0038] 1. Servo motor; 2. Remote control constant pressure variable pump; 3. Proportional relief valve; 4. First check valve; 5. Stop valve; 6. Accumulator; 7. Safety valve; 8. Pressure sensor; 9. Second check valve; 10. Solenoid ball valve; 11. PLC control system; 12. Driver; 13. Second oil tank; 14. Damper; 15. HMI; 16. First oil tank. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. 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 making creative work are within the scope of protection of the present invention.

[0040] The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.

[0041] As attached Figure 1 As shown, an embodiment of the present invention provides a hydraulic control system for a plate straightening machine, the hydraulic control system comprising: a power module, a first one-way valve 4, a second one-way valve 9, a detection module, a proportional relief valve 3, an accumulator 6 and a control module, wherein:

[0042] The power module is used to provide power; one end of the first one-way valve 4 is connected to the output end of the power module through a hydraulic pipeline; one end of the second one-way valve 9 is connected to the other end of the first one-way valve 4; the detection module is arranged in parallel with the second one-way valve 9, one end of the detection module is connected to the hydraulic pipeline between the first one-way valve 4 and the second one-way valve 9, and the detection module is used to detect the output pressure of the first outlet of the power module; the oil inlet of the proportional relief valve 3 is connected to the remote control port of the power module through a hydraulic pipeline, and the oil return port of the proportional relief valve 3 is connected to the first oil tank 16; the accumulator 6 is connected to the first outlet pipeline of the power module through a hydraulic pipeline and is arranged in parallel with the first one-way valve 4; the accumulator 6 is connected to the hydraulic pipeline between the output end of the power module and the first one-way valve 4 through a hydraulic pipeline; the control module is connected to the power module for adjusting the speed output by the power module, the control module is connected to the proportional relief valve 3 for steplessly adjusting the pressure of the proportional relief valve 3, and the control module is connected to the other end of the detection module for receiving the detection signal of the detection module to steplessly adjust the outlet pressure of the power module.

[0043] Preferably, the first one-way valve 4 is a spring-type one-way valve, and preferably, the second one-way valve 9 is a hydraulically controlled one-way valve; in this way, the first one-way valve 4 is set as a spring-type one-way valve, which has the advantages of simple structure, sensitive action and convenient maintenance, and the second one-way valve 9 is set as a hydraulically controlled one-way valve, which has the function of enabling the one-way valve to flow in the reverse direction; specifically, when the control oil circuit is not connected to the pressurized oil, the hydraulically controlled one-way valve works as an ordinary one-way valve, and the pressurized oil only flows from the oil inlet to the oil outlet and cannot flow in the reverse direction; when the electromagnet Y1 is energized, the valve core of the electromagnetic ball valve 10 moves to the right under the push of the electromagnetic force, and the control pressure of the control oil circuit is input to the hydraulically controlled one-way valve, the hydraulically controlled one-way valve opens, and the inlet and outlet oil ports are connected; thereby connecting the pressure oil P of the power module to the hydraulic system actuator.

[0044] In some optional implementations of this embodiment, the detection module can be set as a sensor, preferably a pressure sensor 8. Such a setting ensures that when the pressure is detected, the detected result is accurate, and at the same time, the structure is simple, the cost is low, and the detection result is reliable.

[0045] Specifically, in the hydraulic control system of the plate straightening machine of the present invention, the control module includes: an interaction module, a control unit and a driver 12, wherein:

[0046] The interactive module is used to transmit flow instructions and pressure instructions to the control unit, and display the detection signal received by the control unit; the control unit is used to receive the signal detected by the detection module, and receive the flow instructions and pressure instructions transmitted by the interactive module, and adjust the pressure of the proportional relief valve 3 according to the flow instructions and pressure instructions output by the interactive module; the driver 12 is used to control the speed of the power module according to the feedback signal received by the control module from the detection module. The driver 12 transmits the system pressure of the hydraulic system and the real-time status acquisition data of the power module operation to the control unit, so that the control unit transmits the straightening machine operation data to the interactive module for upper display after digital-to-analog conversion.

[0047] In some optional implementations of this embodiment, the interaction module in the present invention can be set to HMI15, where HMI is the abbreviation of Human Machine Interface, which means human-machine interface, also called human-machine interface, which is the medium for interaction and information exchange; the control unit can be set to a PLC control system 11, and the driver 12 is preferably set to a servo driver.

[0048] Specifically, Figure 1 As shown, in the hydraulic control system of the plate straightening machine of the present invention, the power module includes: a servo motor 1 and a remote control variable pump, wherein:

[0049] The servo motor 1 is connected to the driver 12 through a cable. The servo motor 1 is used to start and stop according to the start and stop instructions issued by the interactive module. At the same time, the servo motor 1 is used to control the speed of the servo motor 1 according to the pressure signal value output by the control unit to the driver 12. After the pressure detected by the detection module reaches the set value, the speed of the servo motor 1 is automatically reduced to reduce the energy output. When the straightening machine needs to maintain pressure for a long time, the servo motor 1 is controlled by the control unit to shut down or enter a standby working state to reduce energy consumption. The transmission shaft of the remote control variable pump is fixedly connected to the motor shaft of the servo motor 1, the inlet S of the remote control variable pump is connected to the second oil tank 13, and the first outlet P1 of the remote control variable pump is connected to the hydraulic pipeline connecting the accumulator 6, the proportional relief valve 3, the detection module and the first one-way valve 4. The remote control port X of the remote control variable pump is connected to the oil inlet of the proportional relief valve 3, and the second outlet R (L) of the remote control variable pump is connected to the second oil tank 13.

[0050] Preferably, the remote-controlled variable displacement pump is a remote-controlled constant-pressure variable displacement pump 2 .

[0051] In combination with practical applications, the principles of the plate straightening machine hydraulic control system of the present invention include:

[0052] After the plate straightening machine and other equipment are in place, according to the process action and incoming material conditions of the plate straightening machine, the working pressure of the hydraulic control system in the present invention and the speed requirement of the actuator are input to HMI15, and the servo motor 1 is started through HMI15. At the same time, the PLC control system 11 gives the analog signal to the proportional relief valve 3 for pressure regulation, and the outlet pressure of the remote control type constant pressure variable pump 2 is quickly adjusted to the given pressure. The first outlet P1 pressure oil enters the detection module through the first one-way valve 4 and the damper 14. The detection module feeds back the measured pressure signal to the PLC control system 11, and the PLC control system 11 inputs the pressure signal to the driver 12. The driver 12 controls the speed of the servo motor 1 according to the input pressure signal value until the pressure of the detection module reaches the set value. The speed of the servo motor 1 is automatically reduced, thereby reducing the energy output. When the equipment needs to maintain pressure for a long time, the servo motor 1 can be controlled to shut down or enter the standby working state through the PLC control system 11, thereby further reducing energy consumption.

[0053] Specifically, the accumulator 6 in the present invention is used to compensate for the problem of frequent starting of the servo motor 1 caused by leakage of the hydraulic control system. The pressure closed-loop control system composed of the accumulator 6, the detection module, the PLC control system 11, and the driver 12 can maintain the working pressure of the hydraulic system within a set pressure range.

[0054] Specifically, since the proportional relief valve 3 has the advantages of fast response speed, high precision, strong stability and adaptability, it can quickly adjust the hydraulic flow and pressure in the hydraulic control system of the present invention to achieve the best match between flow and pressure, thereby realizing accurate control and regulation of the hydraulic flow, ensuring the long-term stability and reliable working performance of the proportional relief valve 3. In addition, the flow size can be flexibly adjusted according to the different needs of the hydraulic system to meet the needs of different working conditions, so that it can be applicable to different flow requirements under various working conditions of the straightening machine.

[0055] Specifically, in combination with practical applications, since the proportional relief valve 3 can steplessly adjust the working pressure of the hydraulic system, the pressure setting value is fed back to the driver 12 through the detection module, and the driver 12 further controls the speed of the servo motor 1 to supply the flow of the hydraulic control system on demand until the pressure reaches the set value, and the speed of the servo motor 1 is automatically reduced to the set value or stopped, thereby reducing system heating, reducing oil temperature, reducing oil leakage, reducing equipment maintenance costs, and increasing service life, while achieving the purpose of energy saving and consumption reduction. For working conditions with small loads on the actuator, the lower working pressure reduces the torque of the servo motor 1 input shaft, thereby reducing energy consumption, accurately controlling the various action parameters required by the system, and reducing the internal leakage of the remote-controlled constant pressure variable pump 2, thereby improving the working efficiency of the hydraulic pump.

[0056] Specifically, the plate straightening machine hydraulic control system in the present invention also includes a stop valve 5, one end of the stop valve 5 is connected to the accumulator 6 through a hydraulic pipeline, and the other end of the stop valve 5 is connected to the hydraulic pipeline of the first one-way valve 4 connected to the first outlet of the power module.

[0057] Specifically, in the hydraulic control system of the plate straightening machine in the present invention, in order to further prevent pressure overshoot of the hydraulic control system and perform pressure protection on the hydraulic control system, a safety valve 7 is also arranged between the accumulator 6 and the stop valve 5. One end of the safety valve 7 is connected to the hydraulic pipeline connecting the accumulator 6 and the stop valve 5 through a hydraulic pipeline, and the other end of the safety valve 7 is connected to the second oil tank 13.

[0058] Specifically, in the hydraulic control system of the plate straightening machine in the present invention, a damper 14 is provided on the pipeline connecting the detection module to one end of the first one-way valve 4 .

[0059] In this way, the damper 14 is arranged in the hydraulic control circuit of the present invention for two purposes. The first function is that since the servo motor 1 responds quickly, the pressure shock is large when the servo motor 1 is started under load. In order not to reduce the overall response of the hydraulic control system, the damper 14 can prevent the detection module from being damaged due to the pressure shock. The second function is that the damper 14 can filter the peak pressure of the hydraulic system to prevent the control signal of the detection module from causing abnormal movement of the servo motor 1, thereby better ensuring the safe and stable operation of the hydraulic control system.

[0060] Specifically, in the hydraulic control system of the plate straightening machine in the present invention, it also includes an electromagnetic ball valve 10, the first oil inlet P of the electromagnetic ball valve 10 is connected to the first one-way valve 4 through a hydraulic pipeline intersection, and is connected to the damper 14 on the hydraulic pipeline connecting the second one-way valve 9, the oil outlet T of the electromagnetic ball valve 10 is connected to the first oil tank 16, and the second oil inlet A of the electromagnetic ball valve 10 is connected to the oil inlet of the second one-way valve 9 through a control pipeline.

[0061] Specifically, in combination with practical applications, the role of the electromagnetic ball valve 10 in the present invention and how the electromagnetic ball valve 10 and other components further solve the problems of high energy consumption and frequent equipment maintenance caused by long-term high pressure and large flow of different actuators and different process actions in the hydraulic control system are further explained:

[0062] Specifically, the second one-way valve 9 controlled by the electromagnetic ball valve 10 can separate the servo pump unit from the P-port pressure source without leakage, avoiding the reduction of the detection module set value caused by leakage in the hydraulic control system, thereby interfering with the frequent start and stop of the servo motor 1. The accumulator 6 is used to maintain the pressure stability at the detection module. For the pressure-maintaining condition or when flow output is required, the electromagnet Y1 of the electromagnetic ball valve 10 is energized, the second one-way valve 9 is opened, and the pressure oil in the accumulator 6 can be supplied to the hydraulic system first. The start of the servo motor 1 is controlled by setting the oil replenishment pressure signal point of the detection module. This shutdown method of preferentially using the accumulator 6 to supply oil extends the start frequency of the servo motor 1 and further reduces energy consumption. At the same time, the number and volume of the accumulator 6 can be flexibly adjusted according to the process action of the straightening machine to ensure that the servo motor 1 is in standby mode for a long time.

[0063] In practice, when the above-mentioned hydraulic control system of the present invention is used to control the plate straightening machine, the servo motor 1 drives the remote-controlled constant-pressure variable pump 2, the inlet of the remote-controlled constant-pressure variable pump 2 is connected to the second oil tank 13, the first outlet P1 of the remote-controlled constant-pressure variable pump 2 is connected to the first one-way valve 4 and the second one-way valve 9, and the damper 14 and the pressure sensor 8 are connected to the outlet of the first one-way valve 4, and the electromagnetic ball valve 10 is connected in parallel; the other way of the first outlet P1 of the remote-controlled constant-pressure variable pump 2 is connected in parallel to the high-pressure stop valve 5, the accumulator 6 and the safety valve 7; wherein the remote control port X of the remote-controlled constant-pressure variable pump 2 is connected to the oil inlet of the proportional relief valve 3, and the oil return port T of the proportional relief valve 3 is connected to the first oil tank 16; the servo motor 1 is connected to the servo driver 12 through a control cable, and the HMI15 is used to input flow instructions and pressure instructions to the PLC control system 11, The PLC control system 11 inputs the pressure command signal to the amplifier control signal of the proportional relief valve 3, the pressure sensor 8 measures the pressure signal at the outlet of the hydraulic pump, and inputs the feedback signal to the PLC control system 11, the PLC control system 11 inputs the pressure control signal to the servo driver 12, the servo driver 12 controls the operation of the servo motor 1, the servo driver 12 transmits the system pressure, the real-time state acquisition data of the motor operation to the PLC control system 11, the PLC control system 11 transmits the operation data to the HMI15 for upper display after digital-to-analog conversion, and the energy-saving stepless pressure regulation servo variable speed pump control system thus formed can better realize the precise pressure control and on-demand flow supply of the hydraulic system, reduce energy consumption, and efficiently, stably and accurately control the various process actions of the hydraulic system of metallurgical equipment.

[0064] In summary, the plate straightening machine hydraulic control system of the present invention has at least the following advantages:

[0065] (1) The servo control system consisting of the servo motor 1, the driver 12, the remote-controlled constant pressure variable pump 2, the pressure sensor 8, and the PLC control system 11 can provide adjustable variable flow in real time according to the flow change requirements of the system, avoid high-pressure throttling, and realize the pressure and speed dual closed-loop control of the hydraulic system. The dual variable control method composed of the servo motor 1 and the remote-controlled variable pump can realize the supply of what is needed without energy waste. In some working conditions, the cooling system of the hydraulic station can be eliminated or the heat dissipation power of the circulating cooling device can be reduced.

[0066] (2) The servo variable speed pump system composed of a control module and a power module can adjust the constant pressure variable point of the hydraulic pump steplessly through the proportional relief valve 3 according to the load size, thereby accurately controlling the swash plate angle of the remote control variable pump. The remote control constant pressure variable pump 2 itself can adjust the output flow rate as needed; while reducing the torque at the input end of the servo motor 1, it avoids the shortcomings of the existing technology of large motor selection, large size, and high energy consumption.

[0067] (3) The speed of the servo motor 1 is used to adjust the system flow. The servo variable speed pump system detects and responds to the flow demand of the hydraulic system according to the pressure sensor 8. After the output pressure reaches the set value, the servo driver 12 controls the servo motor 1 to switch to low speed operation or shutdown mode, thereby eliminating the disadvantage of the original system that the industrial frequency motor is always running under load and has large energy loss. This not only saves energy and is highly efficient, but also reduces the installed power of the hydraulic system while extending the service life of the hydraulic pump.

[0068] (4) The second one-way valve 9 controlled by the electromagnetic ball valve 10 can separate the servo variable speed pump system from the pressure source P without leakage, and cooperate with the accumulator 6 and the pressure sensor 8 to provide a constant pressure power source for the system, thereby avoiding the start of the servo motor 1 due to leakage of the hydraulic system or a small flow supply state, and controlling the operation of the hydraulic system more accurately, more energy-saving, and more efficiently; the accumulator 6 can flexibly adjust the number and volume size according to the working conditions of the equipment, so the design of the present invention is more reasonable and has a higher degree of free combination.

[0069] Second, as Figure 2 As shown, the present invention also provides a control method using the above-mentioned plate straightening machine hydraulic control system, comprising:

[0070] Detect the outlet pressure of the straightening machine hydraulic pump and determine whether it reaches the preset value; if it reaches the preset value, the speed of the power module is reduced or the hydraulic system enters a pressure-maintaining state, so that the straightening machine is shut down or in a standby state; if it does not reach the preset value, the obtained hydraulic pump pressure data is fed back to the control module, and the control module controls the speed of the power module and the input electrical signal of the amplifier of the proportional relief valve 3 according to the obtained pressure data, and then adjusts the outlet pressure of the remote-controlled constant-pressure variable pump until the outlet pressure of the straightening machine hydraulic pump reaches the preset value.

[0071] Therefore, the hydraulic control method of the plate straightening machine of the present invention detects the required pressure value and makes the outlet pressure of the straightening machine hydraulic pump reach the set value through feedback adjustment, so that the straightening machine enters the shutdown or standby state in time after the straightening operation is completed, thereby avoiding the problems of the straightening machine working for a long time or the large installed power, low efficiency, fast heating and easy aging of components of the hydraulic system, and solving the high energy consumption and frequent equipment maintenance caused by long-term high pressure and large flow of different actuators and different process actions.

[0072] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic control system for a plate straightening machine, characterized in that: include: A power module, used for providing power; a first one-way valve, one end of which is connected to an output end of the power module through a hydraulic pipeline; a second one-way valve, one end of which is connected to the other end of the first one-way valve; a detection module, the detection module and the second one-way valve are arranged in parallel, one end of the detection module is connected to the hydraulic pipeline between the first one-way valve and the second one-way valve, and the detection module is used to detect the output pressure of the first outlet of the power module; A proportional relief valve, wherein the oil inlet of the proportional relief valve is connected to the remote control port of the power module through a hydraulic pipeline, and the oil return port of the proportional relief valve is connected to the first oil tank; An accumulator, the accumulator is connected to the first outlet pipeline of the power module through a hydraulic pipeline and is arranged in parallel with the first one-way valve; the accumulator is connected to the hydraulic pipeline between the output end of the power module and the first one-way valve through a hydraulic pipeline; A control module, wherein the control module is connected to the power module and is used to adjust the rotational speed output by the power module. The control module is connected to the proportional relief valve and is used to adjust the pressure of the proportional relief valve. The control module is connected to the other end of the detection module and is used to receive the detection signal of the detection module and adjust the outlet pressure of the power module.

2. The plate straightening machine hydraulic control system according to claim 1, characterized in that: The detection module includes a pressure sensor.

3. The plate straightening machine hydraulic control system according to claim 1, characterized in that: The control module comprises: An interactive module, the interactive module is used to transmit flow instructions and pressure instructions to the control unit, and at the same time display the detection signal received by the control unit; A control unit, the control unit is used to receive the signal detected by the detection module, and simultaneously receive the flow command and the pressure command transmitted by the interaction module, and perform pressure regulation on the proportional relief valve according to the flow command and the pressure command output by the interaction module; A driver is used to control the rotation speed of the power module according to the feedback signal received by the control module from the detection module. The driver collects the real-time status data of the power module and transmits it to the control unit, so that the control unit transmits the straightening machine operation data to the interactive module for upper display after digital-to-analog conversion.

4. The plate straightening machine hydraulic control system according to claim 3, characterized in that: The power module comprises: A servo motor, wherein the servo motor is connected to the driver via a cable, and is used to start and stop according to the start and stop instructions issued by the interactive module. At the same time, the servo motor is used to control the speed of the servo motor according to the pressure signal value output by the control unit to the driver, until the pressure detected by the detection module reaches the set value, the speed of the servo motor is automatically reduced to reduce energy output, and when the straightening machine needs to maintain pressure for a long time, the servo motor is controlled by the control unit to stop or enter a standby working state to reduce energy consumption; A remote control variable pump, wherein the transmission shaft of the remote control variable pump is fixedly connected to the motor shaft of the servo motor, the inlet of the remote control variable pump is connected to the second oil tank, the first outlet of the remote control variable pump is connected to the hydraulic pipeline connecting the accumulator, the proportional relief valve, the detection module and the first one-way valve, the remote control port of the remote control variable pump is connected to the oil inlet of the proportional relief valve, and the second outlet of the remote control variable pump returns oil to the second oil tank.

5. The plate straightening machine hydraulic control system according to claim 1, characterized in that: It also includes a stop valve, one end of which is connected to the accumulator through a hydraulic pipeline, and the other end of which is connected to the hydraulic pipeline of the first one-way valve connected to the first outlet of the power module.

6. The plate straightening machine hydraulic control system according to claim 5, characterized in that: A safety valve is also provided between the accumulator and the stop valve. One end of the safety valve is connected to the hydraulic pipeline connecting the accumulator and the stop valve through a hydraulic pipeline, and the other end of the safety valve is connected to the second oil tank.

7. The plate straightening machine hydraulic control system according to claim 1, characterized in that: A damper is arranged on the pipeline connecting the detection module to one end of the first one-way valve.

8. The plate straightening machine hydraulic control system according to claim 7, characterized in that: It also includes an electromagnetic ball valve, a first oil inlet of the electromagnetic ball valve is connected to the hydraulic pipeline connecting the first one-way valve to the second one-way valve through a hydraulic pipeline and is connected to the damper, an oil outlet of the electromagnetic ball valve is connected to a first oil tank, and a second oil inlet of the electromagnetic ball valve is connected to the oil inlet of the second one-way valve through a control pipeline.

9. The plate straightening machine hydraulic control system according to claim 4, characterized in that: The variable displacement pump comprises a remote control type constant pressure variable displacement pump.

10. A control method for a plate straightening machine hydraulic control system using any one of claims 1 to 9, characterized in that: include: Detect the outlet pressure of the straightening machine hydraulic pump and determine whether it reaches the preset value; If the preset value is reached, the speed of the power module will be reduced or the hydraulic system will enter the pressure-maintaining state, causing the straightening machine to stop or enter the standby state; If the preset value is not reached, the obtained hydraulic pump pressure data will be fed back to the control module. The control module will control the speed of the power module and the input electrical signal size of the proportional relief valve amplifier according to the obtained pressure data, and then adjust the outlet pressure of the remote-controlled constant pressure variable pump until the outlet pressure of the straightening machine hydraulic pump reaches the preset value.

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