Double-servo-pump-controlled hydraulic system of rapid unloading oil-electric hybrid numerical control synchronous bending machine

Abstract

The invention discloses a hydraulic system of a double-servo-pump-controlled rapid load relief oil-electric hybrid numerical control synchronous bending machine, and belongs to the technical field of electro-hydraulic numerical control bending machines. Comprising a servo motor, a servo pump, a main pressure overflow valve, a three-position four-way reversing valve, a quick descending valve, a first throttling hole, a safety valve, a back pressure valve, a first one-way valve, a second throttling hole, a first two-position four-way reversing valve, a second one-way valve, a second two-position four-way reversing valve, a prefill valve, an acceleration cylinder, an oil tank, a third two-position four-way reversing valve, an overflow valve and a fourth two-position four-way reversing valve. Through the mode, the dependence on the servo motor is reduced through the overflow valve and the electromagnetic directional valve, the technical requirement of the servo motor is reduced, meanwhile, the production cost of the servo motor is reduced, the load release speed is increased, the overall load release performance is obviously improved, the production cost is reduced, and the purposes of high efficiency and cost reduction are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of electro-hydraulic numerically controlled bending machines, and in particular to a hydraulic system of a dual-servo pump-controlled rapid load-releasing oil-electric hybrid numerically controlled synchronous bending machine. Background Art

[0002] The electro-hydraulic CNC bending machine adopts an electro-hydraulic servo system, which can provide stable and high-precision processing results. Its hydraulic system controls the synchronization of the slide through a proportional electro-hydraulic valve group to ensure the parallelism and synchronization of the slide, thereby ensuring processing accuracy. In addition, the electro-hydraulic CNC bending machine is usually equipped with an advanced CNC system, which can achieve fast response and high-efficiency processing, and is particularly suitable for processing thick plates and large-scale production tasks.

[0003] For example, Chinese patent CN107816462A discloses a dual-servo pump-controlled electro-hydraulic CNC synchronous bending machine hydraulic system, including a speed-increasing cylinder, an oil return circuit, a first oil circuit, a second oil circuit and a third oil circuit; a filling valve is provided on the oil return circuit, one end of the oil return circuit is connected to the speed-increasing cylinder, and the other end is connected to the oil tank; a first reversing valve is provided on the first oil circuit, one end of the first oil circuit is connected to the speed-increasing cylinder, and the other end is connected to the oil tank; one end of the second oil circuit is connected to the speed-increasing cylinder, and the other end is connected to the first reversing valve, and a quick lowering valve, a relief valve, a one-way valve and a back pressure valve are provided on the second oil circuit; one end of the third oil circuit is connected to the first oil circuit and the second oil circuit, and the other end is connected to the oil tank, and a safety valve is provided on the third oil circuit; a second reversing valve is provided between the third oil circuit and the oil return circuit; a third reversing valve is connected between the oil return circuit and the first oil circuit.

[0004] However, the technology has the following problems: the pressure relief action of the above structure is abnormal during use, resulting in slow load relief, and higher requirements are placed on the maximum speed of the servo motor, so the technical requirements for the servo motor are higher and the production cost is high.

[0005] Based on this, the present invention designs a dual servo pump-controlled rapid load-releasing oil-electric hybrid CNC synchronous bending machine hydraulic system to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a dual-servo pump-controlled rapid load-releasing oil-electric hybrid CNC synchronous bending machine hydraulic system.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The hydraulic system of the dual servo pump-controlled rapid load-relief oil-electric hybrid CNC synchronous bending machine includes a servo motor, a servo pump, a main pressure relief valve, a three-position four-way reversing valve, a quick lowering valve, a first throttle hole, a safety valve, a back pressure valve, a first check valve, a second throttle hole, a first two-position four-way reversing valve, a second check valve, a second two-position four-way reversing valve, a filling valve, a speed-increasing cylinder, an oil tank, a third two-position four-way reversing valve, a relief valve and a fourth two-position four-way reversing valve;

[0009] The output end of the servo motor is electrically connected to the servo pump, the servo motor is connected to a detection module for detecting the health status of the motor, the servo pump is connected to a cooling and cleaning module, and the cooling and cleaning module is connected to the speed increasing cylinder;

[0010] The first throttle hole is provided between the connecting pipe of the main pressure relief valve and the speed increasing cylinder;

[0011] The oil suction port of the servo pump is connected to the oil outlet of the oil tank, and the output end of the servo pump is connected to the P port of the three-position four-way reversing valve, the A port of the three-position four-way reversing valve is connected to the quick-down valve, the B port of the three-position four-way reversing valve is connected to the upper chamber speed-increasing oil inlet end of the speed-increasing cylinder, and the T port of the three-position four-way reversing valve is connected to the oil tank;

[0012] The first upper chamber oil outlet end of the speed increasing cylinder is connected to the input end of the overflow valve through a pipeline, the output end of the overflow valve is connected to the B port of the fourth two-position four-way reversing valve through a pipeline, and the T port of the fourth two-position four-way reversing valve is connected to the oil inlet of the oil tank through a pipeline;

[0013] The oil outlet end of the lower chamber of the speed increasing cylinder is connected to the first one-way valve and the back pressure valve respectively, and the first one-way valve and the back pressure valve are both connected to the quick lower valve;

[0014] The second upper chamber oil outlet end of the speed increasing cylinder is connected to the B port of the first two-position four-way reversing valve through a pipeline, the T port of the first two-position four-way reversing valve is connected to the pipeline between the fourth two-position four-way reversing valve and the safety valve, a second throttling hole is provided inside the T port pipeline of the first two-position four-way reversing valve, and the P port of the first two-position four-way reversing valve is connected to the pipeline between the three-position four-way reversing valve and the servo pump through a pipeline;

[0015] The upper end of the speed increasing cylinder is connected to the filling valve, and the filling valve is connected to the servo pump and the main pressure relief valve through the second two-position four-way reversing valve;

[0016] The servo pump is connected to the oil tank via a third two-position four-way reversing valve;

[0017] The data transmission end of the speed increasing cylinder is connected to one end of the magnetic scale, the numerical control system is connected to the other end of the magnetic scale through a wire, the numerical control system is connected to the input end of the driver through a wire, and the output end of the driver is connected to the servo motor through a wire.

[0018] Furthermore, the oil tank is connected to the B port of the third two-position four-way reversing valve through a pipeline, and the P port of the third two-position four-way reversing valve is connected to the pipeline between the three-position four-way reversing valve and the servo pump through a pipeline.

[0019] Furthermore, the oil outlet end of the lower chamber of the speed increasing cylinder is connected to the pipeline connected to the T port of the three-position four-way reversing valve through a safety valve.

[0020] Furthermore, the back pressure valve is connected in parallel with the first one-way valve, the lower chamber oil outlet end of the speed increasing cylinder is connected to the quick lower valve through the first one-way valve, and the lower chamber oil outlet end of the speed increasing cylinder is also connected to the quick lower valve through the back pressure valve.

[0021] Furthermore, the P port of the second two-position four-way reversing valve is connected to the pipeline between the three-position four-way reversing valve and the servo pump through the second one-way valve, the T port of the second two-position four-way reversing valve is connected to the main pressure relief valve through a pipeline, the main pressure relief valve is connected to the oil outlet of the servo pump through a pipeline, and the main pressure relief valve is connected to the oil inlet of the oil tank through a pipeline.

[0022] Furthermore, the filling valve is provided with three ports, the first port of the filling valve is connected to the B port of the second two-position four-way reversing valve through a pipeline, and a third throttling hole is provided inside the pipeline between the filling valve and the second two-position four-way reversing valve, the second port of the filling valve is connected to the upper end of the speed increasing cylinder through a pipeline, and the third port of the filling valve is connected to the oil tank through a pipeline.

[0023] Furthermore, the detection module includes a temperature detection unit and a rotation speed detection unit, and both the temperature detection unit and the rotation speed detection unit are connected to the servo motor.

[0024] Furthermore, the temperature detection unit includes a temperature sensor, a thermal protector and an automatic power-off device. The collection end of the temperature sensor is fixedly mounted on the servo motor and is used to collect temperature data of the servo motor. The temperature sensor is electrically connected to the thermal protector, and the thermal protector is electrically connected to the automatic power-off device. The thermal protector and the automatic power-off device are both electrically connected to the servo motor and are used to protect the servo motor. The temperature sensor is electrically connected to the numerical control system.

[0025] Furthermore, the speed detection unit includes a torque sensor, a resistance sensor and a speed sensor, and the collection ends of the torque sensor, the resistance sensor and the speed sensor are all electrically connected to the servo motor, and the output ends of the torque sensor, the resistance sensor and the speed sensor are all electrically connected to the CNC system.

[0026] Furthermore, the cooling and cleaning module includes a motor, a driving pump, a second overflow valve, a pressure switch, a controller, a third one-way valve, a three-way valve, a flushing filter, a fourth one-way valve, a hydraulic oil quality detector, an oil storage tank and a second three-way valve, the output end of the motor is connected to the driving pump, the oil suction port of the driving pump is connected to the oil tank, the oil outlet of the driving pump is connected to one end of the second overflow valve, the other end of the second overflow valve is connected to the oil tank, the oil outlet of the driving pump is connected to one end of the pressure switch, the other end of the pressure switch is connected to one end of the controller, the other end of the controller is connected to the driving pump, and the oil outlet of the driving pump is connected to the third one-way valve. One end of the third one-way valve is connected, the other end of the third one-way valve is connected to the input end of the three-way valve, the first output end of the three-way valve is connected to the servo pump, the second output end of the three-way valve is connected to the speed-increasing cylinder, the servo pump and the speed-increasing cylinder are both connected to the input end of the flushing filter, the output end of the flushing filter is connected to one end of the fourth one-way valve, the other end of the fourth one-way valve is connected to the input end of the oil storage tank, a hydraulic oil quality tester is fixedly installed inside the oil storage tank, the output end of the oil storage tank is connected to the input port of the second three-way valve, the first output port of the second three-way valve is connected to the oil tank, and the second output port of the second three-way valve is connected to an external oil collecting device.

[0027] Compared with the prior art, the present invention has the following beneficial effects: 1. The hydraulic unloading action of the present invention is completed in two steps. The first step is to unload the upper chamber of the speed-increasing oil cylinder by the overflow valve and the electromagnetic reversing valve, and the second step is to unload the speed-increasing oil cylinder by the servo motor reversing. The overflow valve and the electromagnetic reversing valve reduce the dependence on the servo motor, reduce the technical requirements of the servo motor, and reduce the production cost of the servo motor. The unloading speed is accelerated, so that the overall unloading performance is significantly improved, the production cost is reduced, and the purpose of high efficiency and cost reduction is achieved.

[0028] 2. The present invention realizes cooling and cleaning of the speed increasing cylinder and the servo pump by adding a cooling and cleaning module, thereby ensuring the long-term normal operation of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 The invention relates to a dual servo pump controlled rapid load relief oil-electric hybrid CNC synchronous bending machine hydraulic system connection Figure 1 ;

[0031] Figure 2The invention relates to a dual servo pump controlled rapid load relief oil-electric hybrid CNC synchronous bending machine hydraulic system connection Figure 2 ;

[0032] Figure 3 is a connection block diagram of the detection module of the present invention;

[0033] Figure 4 is a connection block diagram of the temperature detection unit of the present invention;

[0034] Figure 5 is a connection block diagram of a rotation speed detection unit of the present invention;

[0035] Figure 6 It is a connection diagram of the cooling and cleaning module of the present invention.

[0036] The numbers in the figure represent:

[0037] 1. Servo motor; 2. Servo pump; 3. Main pressure relief valve; 4. Three-position four-way reversing valve; 5. Quick-down valve; 6. First throttle hole; 7. Safety valve; 8. Back pressure valve; 9. First check valve; 10. Second throttle hole; 11. First two-position four-way reversing valve; 12. Second check valve; 13. Second two-position four-way reversing valve; 14. Third throttle hole; 15. Filling valve; 16. Speed ​​increasing cylinder; 17. Oil tank; 18. Third two-position four-way reversing valve; 19. Relief valve; 20. Fourth two-position four-way reversing valve; 21. CNC system; 22. Driver; 23. Magnetic scale; 24. Detection module; 241 , temperature detection unit; 2411, temperature sensor; 2412, thermal protector; 2413, automatic power-off device; 242, speed detection unit; 2421, torque sensor; 2422, resistance sensor; 2423, speed sensor; 25, cooling and cleaning module; 251, motor; 252, drive pump; 253, overflow valve 2; 254, pressure switch; 255, controller; 256, third one-way valve; 257, three-way valve; 258, flushing filter; 259, fourth one-way valve; 260, hydraulic oil quality detector; 261, oil storage tank; 262, second three-way valve. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0039] Embodiment 1: In some embodiments, please refer to the drawings of the specification Figure 1-Figure 2, a dual servo pump-controlled rapid load-releasing oil-electric hybrid CNC synchronous bending machine hydraulic system, including a servo motor 1, a servo pump 2, a main pressure relief valve 3, a three-position four-way reversing valve 4, a quick lowering valve 5, a first throttle hole 6, a safety valve 7, a back pressure valve 8, a first check valve 9, a second throttle hole 10, a first two-position four-way reversing valve 11, a second check valve 12, a second two-position four-way reversing valve 13, a filling valve 15, a speed increasing cylinder 16, a fuel tank 17, a third two-position four-way reversing valve 18, a relief valve 19 and a fourth two-position four-way reversing valve 20;

[0040] The output end of the servo motor 1 is electrically connected to the servo magnetic scale 23 measuring system pump 2, the servo motor 1 is connected to a detection module 24 for detecting the health of the motor, the servo pump 2 is connected to a cooling and cleaning module 25, and the cooling and cleaning module 25 is connected to the speed increasing cylinder 16;

[0041] The first throttle hole 6 is provided between the connecting pipe of the main pressure relief valve 3 and the speed increasing cylinder 16;

[0042] The oil suction port of the servo pump 2 is connected to the oil outlet of the oil tank 17, and the output end of the servo pump 2 is connected to the P port of the three-position four-way reversing valve 4, the A port of the three-position four-way reversing valve 4 is connected to the quick-down valve 5, the B port of the three-position four-way reversing valve 4 is connected to the upper chamber speed-increasing oil inlet end of the speed-increasing cylinder 16, and the T port of the three-position four-way reversing valve 4 is connected to the oil tank 17;

[0043] Under the action of the forward rotation of the servo motor 1, the pressure oil flows through the P port to the B port of the three-position four-way reversing valve 4 and then to the upper chamber speed-increasing oil inlet end of the speed-increasing cylinder 16. The lower chamber oil outlet end of the speed-increasing cylinder 16 - back pressure valve 8 - fast lowering valve 5 - A-T port of the three-position four-way reversing valve 4 flows back to the oil tank 17. At this time, under the action of the pressure oil, the lower chamber increases the speed and torque of the servo motor 1, which can increase the fast lowering speed of the machine tool.

[0044] The first upper chamber oil outlet end of the speed increasing cylinder 16 is connected to the input end of the relief valve 19 through a pipeline, the output end of the relief valve 19 is connected to the B port of the fourth two-position four-way reversing valve 20 through a pipeline, and the T port of the fourth two-position four-way reversing valve 20 is connected to the oil inlet of the oil tank 17 through a pipeline;

[0045] The oil outlet end of the lower chamber of the speed increasing cylinder 16 is connected to the first one-way valve 9 and the back pressure valve 8 respectively, and the first one-way valve 9 and the back pressure valve 8 are both connected to the quick lower valve 5;

[0046] The second upper chamber oil outlet end of the speed increasing cylinder 16 is connected to the B port of the first two-position four-way reversing valve 11 through a pipeline, the T port of the first two-position four-way reversing valve 11 is connected to the pipeline between the fourth two-position four-way reversing valve 20 and the safety valve 7, a second throttling hole 10 is provided inside the T port pipeline of the first two-position four-way reversing valve 11, and the P port of the first two-position four-way reversing valve 11 is connected to the pipeline between the three-position four-way reversing valve 4 and the servo pump 2 through a pipeline;

[0047] The upper end of the speed increasing cylinder 16 is connected to the filling valve 15, and the filling valve 15 is connected to the servo pump 2 and the main pressure relief valve 3 through the second two-position four-way reversing valve 13;

[0048] The servo pump 2 is connected to the oil tank 17 via a third two-position four-way reversing valve 18;

[0049] The data transmission end of the speed increasing cylinder 16 is connected to one end of the magnetic scale 23, the numerical control system 21 is connected to the other end of the magnetic scale 23 through a wire, the numerical control system 21 is connected to the input end of the driver 22 through a wire, and the output end of the driver 22 is connected to the servo motor 1 through a wire.

[0050] The oil tank 17 is connected to the B port of the third two-position four-way reversing valve 18 through a pipeline, and the P port of the third two-position four-way reversing valve 18 is connected to the pipeline between the three-position four-way reversing valve 4 and the servo pump 2 through a pipeline.

[0051] The pressure oil is divided into different branches by the different amounts of power supplied to the three-position four-way reversing valve 4, the first two-position four-way reversing valve 11, the second two-position four-way reversing valve 13, and the third two-position four-way reversing valve 18. Different bending forces can be achieved by adjusting the torque of the servo motor 1 through the numerical control system 21 and the driver 22, so that the hydraulic system control is more intelligent and the structure is more optimized. A read head is installed on the output shaft of the speed-increasing cylinder 16. The read head and the magnetic scale 23 form a magnetic scale measurement system, and they work according to the principle of magnetic induction. When the read head moves in a straight line in the magnetic field space of the magnetic scale 23, the read head will output standard position pulses in real time according to the relevant displacement of the movement, thereby realizing the rapid detection operation of the moving distance of the output end of the speed-increasing cylinder 16.

[0052] The oil outlet of the lower chamber of the speed increasing cylinder 16 is connected to the pipeline connected to the T port of the three-position four-way reversing valve 4 through the safety valve 7, and the safety valve 7 is set to the maximum pressure that the system can withstand.

[0053] The back pressure valve 8 is connected in parallel with the first check valve 9, and the back pressure valve 8 needs to be adjusted to the pressure at which the machine tool stops supporting the slide plate. The lower chamber oil outlet end of the speed increasing cylinder 16 is connected to the quick lower valve 5 through the first check valve 9, and the lower chamber oil outlet end of the speed increasing cylinder 16 is also connected to the quick lower valve 5 through the back pressure valve 8.

[0054] The P port of the second two-position four-way reversing valve 13 is connected to the pipeline between the three-position four-way reversing valve 4 and the servo pump 2 through the second one-way valve 12, the T port of the second two-position four-way reversing valve 13 is connected to the main pressure relief valve 3 through a pipeline, the main pressure relief valve 3 is connected to the oil outlet of the servo pump 2 through a pipeline, and the main pressure relief valve 3 is connected to the oil inlet of the oil tank 17 through a pipeline.

[0055] The filling valve 15 is provided with three ports, the first port of the filling valve 15 is connected to the B port of the second two-position four-way reversing valve 13 through a pipeline, and a third throttling hole 14 is provided inside the pipeline between the filling valve 15 and the second two-position four-way reversing valve 13, the second port of the filling valve 15 is connected to the upper end of the speed increasing cylinder 16 through a pipeline, and the third port of the filling valve 15 is connected to the oil tank 17 through a pipeline.

[0056] Embodiment 2: In some embodiments, Figure 1 and Figure 2 As shown in the figure, as a preferred embodiment of the present invention, each cycle of the CNC bending machine can be divided into six processes: fast down, pressing, pressure holding, load release, return, and stop:

[0057] Fast down: The fast down valve 5 and the three-position four-way reversing valve 4 are energized. The servo motor 1 drives the servo pump 2 to rotate, and the oil suction port of the servo pump 2 is connected to the oil tank 17. The main pressure oil flows to the P port of the three-position four-way reversing valve 4 without exceeding the main pressure relief valve 3, and then flows from the B port to the upper chamber oil inlet of the speed-increasing cylinder 16, accelerating the fast down speed of the speed-increasing cylinder 16; the oil port of the lower chamber of the speed-increasing cylinder 16 flows back to the oil tank 17 through the back pressure valve 8-fast down valve 5-A-T port of the three-position four-way reversing valve 4. Under the speed-increasing effect of the speed-increasing cylinder 16, the oil is quickly sucked from the oil tank 17 by the gravity of the slide plate and flows through the filling valve 15, thereby achieving the effect of the machine tool moving downward quickly and filling the upper chamber of the speed-increasing cylinder 16 at the same time.

[0058] Suppression: the quick-down valve 5, the first two-position four-way reversing valve 11, the three-position four-way reversing valve 4, the second two-position four-way reversing valve 13, and the fourth two-position four-way reversing valve 20 are energized. The pressure oil is divided into three branches: the first branch flows to the three-position four-way reversing valve 4, P-B, and flows from the B port to the upper chamber oil inlet of the speed-increasing cylinder 16, continuing to play a suppressing role; the second branch flows to the first two-position four-way reversing valve 11, passes through P-B- and then enters the upper chamber of the speed-increasing cylinder 16 to start suppressing; the lower chamber of the speed-increasing oil cylinder flows to the A-T port of the three-position four-way reversing valve 4 through the back pressure valve 8 and the quick-down valve 5, and finally flows to the oil tank 17; the third branch flows to the second two-position four-way reversing valve 13, P-B, flows from the B port to the filling valve 15 and closes the upper chamber of the speed-increasing cylinder 16, providing the necessary conditions for suppression.

[0059] Maintaining pressure: As with the pressing action, only the speed and torque of servo motor 1 need to be adjusted to achieve maintaining pressure.

[0060] Load release: the quick-down valve 5, the first two-position four-way reversing valve 11, the three-position four-way reversing valve 4, and the second two-position four-way reversing valve 13 are energized. At this time, the pressure oil is still divided into two branches: the first is the pressure oil in the upper chamber of the speed-increasing cylinder 16 flowing through the overflow valve 19-the fourth two-position four-way reversing valve 20 B-T-the return oil tank 17, and the second is that under the action of the reverse rotation of the servo motor 1, the pressure oil of the speed-increasing cylinder 16 flows through the three-position four-way reversing valve 4 B-P-servo pump 2-the return oil tank 17; at this time, the first load release time takes precedence over the second one, and is completed in two times. The load release condition is achieved.

[0061] Return stroke: The three-position four-way reversing valve 4 is energized. When the filling valve 15 returns to the normally open position (controls the pressure oil of the filling valve 15 to flow back to the oil tank 17 through the B-T of the second two-position four-way reversing valve 13), the upper chamber of the speed-increasing cylinder 16 is connected to the oil tank 17. At this time, the pressure oil has only one path: under the action of the forward rotation of the servo motor 1, the pressure oil passes through the P-A of the three-position four-way reversing valve 4-the quick lower valve 5-the first non-return valve 9-the lower chamber of the speed-increasing cylinder 16. At this time, under the action of the pressure oil in the lower chamber, the speed and torque of the servo motor 1 are increased, which can increase the return speed of the machine tool.

[0062] Stop: All electromagnetic reversing valves are de-energized, and servo motor 1 stops rotating. The machine tool is in a stationary state.

[0063] Quick jog: 1. To adapt to special working conditions, quick jog bending is required. At this time, quick jog bending continues the working action, and the quick lower valve 5, the first two-position four-way reversing valve 11, the three-position four-way reversing valve 4, the second two-position four-way reversing valve 13, and the fourth two-position four-way reversing valve 20 are continuously energized. When the quick jog function is triggered, the servo motor 1 can keep the set speed at idle state, the third two-position four-way reversing valve 18 is energized, and the pressure oil returns to the oil tank 17 through the P-B- of the third two-position four-way reversing valve 18. After the quick jog function is enabled, the third two-position four-way reversing valve 18 loses power and keeps the working action, and the quick jog function can be realized in this cycle. Thereby improving work efficiency and generating benefits.

[0064] 2. Preheating function. The oil circuit of the quick jog function can also be used when the working environment temperature is low. The servo motor 1 is set to a constant speed at idle state, and the third two-position four-way reversing valve 18 is energized to preheat the hydraulic oil through its own hydraulic oil circulation, which can also play a functional advantage in different environments.

[0065] Embodiment 3: In some embodiments, Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, as a preferred embodiment of the present invention, the detection module 24 includes a temperature detection unit 241 and a rotation speed detection unit 242 , and both the temperature detection unit 241 and the rotation speed detection unit 242 are connected to the servo motor 1 .

[0066] The detection module 24 includes a temperature sensor 2411, a thermal protector 2412 and an automatic power-off device 2413. The acquisition end of the temperature sensor 2411 is fixedly installed on the servo motor 1, and is used to collect temperature data of the servo motor 1. The temperature sensor 2411 is electrically connected to the thermal protector 2412, and the thermal protector 2412 is electrically connected to the automatic power-off device 2413. The thermal protector 2412 and the automatic power-off device 2413 are both electrically connected to the servo motor 1, and are used to protect the servo motor 1. The temperature sensor 2411 is electrically connected to the numerical control system 21.

[0067] The speed detection unit 242 includes a torque sensor 2421, a resistance sensor 2422 and a speed sensor 2423. The acquisition ends of the torque sensor 2421, the resistance sensor 2422 and the speed sensor 2423 are all electrically connected to the servo motor 1, and the output ends of the torque sensor 2421, the resistance sensor 2422 and the speed sensor 2423 are all electrically connected to the numerical control system 21.

[0068] The present invention detects the motor through the detection module 24 and the speed detection unit 242, performs real-time detection of the motor operation status through the torque sensor 2421, the resistance sensor 2422 and the speed sensor 2423, and continuously and reliably detects the motor temperature through the temperature sensor 2411, thereby achieving comprehensiveness and standardization of motor detection. The detection results can be uploaded to the numerical control system 21, and the numerical control system 21 can quickly judge the motor performance. It has strong practicality and economic benefits, improves the accuracy of detecting the motor status, and improves the motor performance.

[0069] The cooling and cleaning module 25 includes a motor 251, a driving pump 252, a second overflow valve 253, a pressure switch 254, a controller 255, a third one-way valve 256, a three-way valve 257, a flushing filter 258, a fourth one-way valve 259, a hydraulic oil quality detector 260, an oil storage tank 261 and a second three-way valve 262. The output end of the motor 251 is connected to the driving pump 252, the oil suction port of the driving pump 252 is connected to the oil tank 17, the oil outlet of the driving pump 252 is connected to one end of the second overflow valve 253, the other end of the second overflow valve 253 is connected to the oil tank 17, the oil outlet of the driving pump 252 is connected to one end of the pressure switch 254, the other end of the pressure switch 254 is connected to one end of the controller 255, and the other end of the controller 255 is connected to the driving pump 252. The oil outlet of 52 is connected to one end of the third one-way valve 256, the other end of the third one-way valve 256 is connected to the input end of the three-way valve 257, the first output end of the three-way valve 257 is connected to the servo pump 2, the second output end of the three-way valve 257 is connected to the speed-increasing cylinder 16, the servo pump 2 and the speed-increasing cylinder 16 are both connected to the input end of the flushing filter 258, the output end of the flushing filter 258 is connected to one end of the fourth one-way valve 259, the other end of the fourth one-way valve 259 is connected to the input end of the oil storage tank 261, a hydraulic oil quality detector 260 is fixedly installed inside the oil storage tank 261, the output end of the oil storage tank 261 is connected to the input port of the second three-way valve 262, the first output port of the second three-way valve 262 is connected to the oil tank 17, and the second output port of the second three-way valve 262 is connected to the external oil collecting device.

[0070] After the servo pump 2 and the speed-increasing cylinder 16 have been used for a long time, the servo pump 2 and the speed-increasing cylinder 16 will heat up, affecting the normal operation of the system; when the servo pump 2 and the speed-increasing cylinder 16 heat up to the threshold set in the numerical control system 21, the pressure switch 254 is closed, the controller 255 receives a signal, controls the motor 251 to turn on, the motor 251 starts, and the motor 251 drives the driving pump 252 to extract the cold oil in the oil tank 17 into the servo pump 2 and the speed-increasing cylinder 16, cools the servo pump 2 and the speed-increasing cylinder 16, and cleans the inside of the servo pump 2 and the speed-increasing cylinder 16. After cooling, the cold oil passes through the flushing filter 258 and enters the oil storage tank 261. The hydraulic oil quality tester 260 detects the quality of the oil. If it meets the standards set in the numerical control system 21, it enters the oil tank 17 through the second three-way valve 262. If it does not meet the standards set in the numerical control system 21, it is discharged to the outside through the second three-way valve 262 for further processing.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Double servo pump controlled rapid load release oil-electric hybrid CNC synchronous bending machine hydraulic system, characterized by: It comprises a servo motor (1), a servo pump (2), a main pressure relief valve (3), a three-position four-way reversing valve (4), a quick-down valve (5), a first throttle hole (6), a safety valve (7), a back pressure valve (8), a first check valve (9), a second throttle hole (10), a first two-position four-way reversing valve (11), a second check valve (12), a second two-position four-way reversing valve (13), a filling valve (15), a speed-increasing cylinder (16), an oil tank (17), a third two-position four-way reversing valve (18), a relief valve (19) and a fourth two-position four-way reversing valve (20); The output end of the servo motor (1) is electrically connected to the servo pump (2); the servo motor (1) is connected to a detection module (24) for detecting the health status of the motor; the servo pump (2) is connected to a cooling and cleaning module (25); and the cooling and cleaning module (25) is connected to the speed increasing cylinder (16); The first throttle hole (6) is provided between the connecting pipe of the main pressure relief valve (3) and the speed increasing cylinder (16); The oil suction port of the servo pump (2) is connected to the oil outlet of the oil tank (17), and the output end of the servo pump (2) is connected to the P port of the three-position four-way reversing valve (4), the A port of the three-position four-way reversing valve (4) is connected to the quick-down valve (5), the B port of the three-position four-way reversing valve (4) is connected to the upper chamber speed-increasing oil inlet end of the speed-increasing cylinder (16), and the T port of the three-position four-way reversing valve (4) is connected to the oil tank (17); The first upper chamber oil outlet end of the speed increasing cylinder (16) is connected to the input end of the overflow valve (19) through a pipeline, the output end of the overflow valve (19) is connected to the B port of the fourth two-position four-way reversing valve (20) through a pipeline, and the T port of the fourth two-position four-way reversing valve (20) is connected to the oil inlet of the oil tank (17) through a pipeline; The oil outlet end of the lower chamber of the speed increasing cylinder (16) is respectively connected to the first one-way valve (9) and the back pressure valve (8), and the first one-way valve (9) and the back pressure valve (8) are both connected to the quick lower valve (5); The second upper chamber oil outlet end of the speed increasing cylinder (16) is connected to the B port of the first two-position four-way reversing valve (11) through a pipeline, the T port of the first two-position four-way reversing valve (11) is connected to the pipeline between the fourth two-position four-way reversing valve (20) and the safety valve (7), a second throttling hole (10) is provided inside the T port pipeline of the first two-position four-way reversing valve (11), and the P port of the first two-position four-way reversing valve (11) is connected to the pipeline between the three-position four-way reversing valve (4) and the servo pump (2) through a pipeline; The upper end of the speed increasing cylinder (16) is connected to the filling valve (15), and the filling valve (15) is connected to the servo pump (2) and the main pressure relief valve (3) through the second two-position four-way reversing valve (13); The servo pump (2) is connected to the oil tank (17) via a third two-position four-way reversing valve (18); The data transmission end of the speed increasing cylinder (16) is connected to one end of a magnetic scale (23), the numerical control system (21) is connected to the other end of the magnetic scale (23) via a wire, the numerical control system (21) is connected to the input end of a driver (22) via a wire, and the output end of the driver (22) is connected to the servo motor (1) via a wire.

2. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 1 is characterized in that: The oil tank (17) is connected to the B port of the third two-position four-way reversing valve (18) through a pipeline, and the P port of the third two-position four-way reversing valve (18) is connected to the pipeline between the three-position four-way reversing valve (4) and the servo pump (2) through a pipeline.

3. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 2 is characterized in that: The oil outlet end of the lower chamber of the speed increasing cylinder (16) is connected to a pipeline connected to the T port of the three-position four-way reversing valve (4) through a safety valve (7).

4. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 3 is characterized in that: The back pressure valve (8) is connected in parallel with the first one-way valve (9); the lower chamber oil outlet end of the speed increasing cylinder (16) is connected to the quick lower valve (5) via the first one-way valve (9); the lower chamber oil outlet end of the speed increasing cylinder (16) is also connected to the quick lower valve (5) via the back pressure valve (8).

5. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 4 is characterized in that: The P port of the second two-position four-way reversing valve (13) is connected to the pipeline between the three-position four-way reversing valve (4) and the servo pump (2) through the second one-way valve (12); the T port of the second two-position four-way reversing valve (13) is connected to the main pressure relief valve (3) through a pipeline; the main pressure relief valve (3) is connected to the oil outlet of the servo pump (2) through a pipeline; and the main pressure relief valve (3) is connected to the oil inlet of the oil tank (17) through a pipeline.

6. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 5 is characterized in that: The charging valve (15) is provided with three ports, the first port of the charging valve (15) is connected to the B port of the second two-position four-way reversing valve (13) through a pipeline, and a third throttling hole (14) is provided inside the pipeline between the charging valve (15) and the second two-position four-way reversing valve (13), the second port of the charging valve (15) is connected to the upper end of the speed increasing cylinder (16) through a pipeline, and the third port of the charging valve (15) is connected to the oil tank (17) through a pipeline.

7. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 6 is characterized in that: The detection module (24) comprises a temperature detection unit (241) and a rotation speed detection unit (242), and both the temperature detection unit (241) and the rotation speed detection unit (242) are connected to the servo motor (1).

8. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 7 is characterized in that: The temperature detection unit (241) comprises a temperature sensor (2411), a thermal protector (2412) and an automatic power-off device (2413); a collection end of the temperature sensor (2411) is fixedly mounted on the servo motor (1) and is used to collect temperature data of the servo motor (1); the temperature sensor (2411) is electrically connected to the thermal protector (2412); the thermal protector (2412) is electrically connected to the automatic power-off device (2413); the thermal protector (2412) and the automatic power-off device (2413) are both electrically connected to the servo motor (1) and are used to protect the servo motor (1); and the temperature sensor (2411) is electrically connected to a numerical control system (21).

9. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 8 is characterized in that: The rotation speed detection unit (242) comprises a torque sensor (2421), a resistance sensor (2422) and a rotation speed sensor (2423); the acquisition ends of the torque sensor (2421), the resistance sensor (2422) and the rotation speed sensor (2423) are all electrically connected to the servo motor (1); and the output ends of the torque sensor (2421), the resistance sensor (2422) and the rotation speed sensor (2423) are all electrically connected to the numerical control system (21).

10. The dual servo pump-controlled rapid load-releasing hydraulic system for oil-electric hybrid CNC synchronous bending machine according to claim 9, characterized in that: The cooling and cleaning module (25) comprises a motor (251), a driving pump (252), a second overflow valve (253), a pressure switch (254), a controller (255), a third one-way valve (256), a three-way valve (257), a flushing filter (258), a fourth one-way valve (259), a hydraulic oil quality detector (260), an oil storage tank (261) and a second three-way valve (262). The output end of the motor (251) is connected to the driving pump (25 2), the oil suction port of the driving pump (252) is connected to the oil tank (17), the oil outlet of the driving pump (252) is connected to one end of the overflow valve (253), the other end of the overflow valve (253) is connected to the oil tank (17), the oil outlet of the driving pump (252) is connected to one end of the pressure switch (254), the other end of the pressure switch (254) is connected to one end of the controller (255), and the other end of the controller (255) is connected to the driving pump (252) The oil outlet of the driving pump (252) is connected to one end of the third one-way valve (256), the other end of the third one-way valve (256) is connected to the input end of the three-way valve (257), the first output end of the three-way valve (257) is connected to the servo pump (2), the second output end of the three-way valve (257) is connected to the speed increasing cylinder (16), the servo pump (2) and the speed increasing cylinder (16) are both connected to the input end of the flushing filter (258), and the output end of the flushing filter (258) is connected to the One end of the fourth one-way valve (259) is connected, and the other end of the fourth one-way valve (259) is connected to the input end of the oil storage tank (261). A hydraulic oil quality detector (260) is fixedly installed inside the oil storage tank (261). The output end of the oil storage tank (261) is connected to the input port of the second three-way valve (262). The first output port of the second three-way valve (262) is connected to the oil tank (17), and the second output port of the second three-way valve (262) is connected to an external oil collection device.

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