A hydraulic control system integrating drive and buffer

Abstract

A hydraulic control system integrating drive and buffering, the hydraulic control system integrating drive and buffering includes a power circuit, a drive and buffering control circuit and an actuator; the power circuit includes a ball valve, an oil tank, a liquid level sensor and a temperature sensor, the oil tank is provided with a liquid level sensor, a temperature sensor and a liquid level thermometer in sequence, the oil inlet end of the ball valve is connected to the oil outlet end of the oil tank, the output end of the motor is connected to the plunger pump, and the oil inlet end of the plunger pump is connected to the oil outlet end of the oil tank. This design controls the opening and closing of valve components through different logical control relationships to achieve the functional requirements of the actuator under different working conditions. The drive control circuit has the functions of instantaneous pressure buildup to provide driving force and quantitative uniform speed pressure buildup to provide driving force. The buffer control circuit has the functions of small load uniform speed buffering and large load instantaneous buffering. The drive and buffering controls are combined for control, so that the efficiency of the hydraulic system is significantly improved.

Description

Technical Field

[0001] The invention relates to an improvement of a hydraulic control system of a driving and buffering actuator, belongs to the field of hydraulic systems, and in particular to a hydraulic control system integrating driving and buffering. Background Art

[0002] The field of hydraulic control technology has been widely used in various industries due to its many outstanding advantages, such as machine tool industry, metallurgical industry, engineering machinery, agricultural machinery, automobile industry, textile industry, shipbuilding industry and other civil industries, as well as defense industry and other military industries. In short, in all engineering and technical fields, hydraulic control technology can be used in occasions involving mechanical equipment, and its application prospects are bright.

[0003] The Chinese invention patent with application number CN201410764363.2 and application date of December 11, 2014 discloses a throttling and overflowing multi-stage buffer hydraulic control system, including a hydraulic pump, a hydraulic cylinder and an oil tank, and also including a throttle valve connected to the system for throttling and buffering, and overflow valve 1 and overflow valve 2 connected to the system for overflow and buffering; the piston rod end of the hydraulic cylinder is fixedly connected to the mechanical push head, the rodless chamber and the rod chamber of the hydraulic cylinder are respectively connected to the first working port and the second working port of the reversing valve 1, the third working port of the reversing valve 1 is connected to the oil outlet of the hydraulic pump through a pipeline, the overflow valve 1 is arranged at the oil outlet of the hydraulic pump, and the overflow valve 2, the reversing valve 2 and the throttle valve are connected in parallel on the pipeline between the fourth working port of the reversing valve 1 and the oil tank. However, this patent only solves the problem of buffer control, and does not combine the drive and buffer parts.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem in the prior art that driving and buffering cannot be effectively combined, and to provide a hydraulic control system that combines driving and buffering and integrates driving and buffering.

[0006] To achieve the above objectives, the technical solution of the present invention is: a hydraulic control system integrating drive and buffer, the hydraulic control system integrating drive and buffer includes a power circuit, a drive and buffer control circuit and an actuator;

[0007] The power circuit includes a ball valve, an oil tank, a liquid level sensor and a temperature sensor. The oil tank is provided with a liquid level sensor, a temperature sensor and a liquid level thermometer in sequence. The oil inlet end of the ball valve is connected to the oil outlet end of the oil tank, the output end of the motor is connected to the plunger pump, the oil inlet end of the plunger pump is connected to the oil outlet end of the oil tank, the oil outlet end of the plunger pump is connected to the drive and buffer control circuit through the power oil circuit P port, the oil outlet end of the plunger pump is connected to the oil inlet end of the electromagnetic overflow valve, and the oil outlet end of the electromagnetic overflow valve is connected to the oil inlet end of the oil tank through the return oil filter;

[0008] The buffer control circuit includes a manual ball valve, two manual ball valves, and a check valve. The oil inlet end of the manual ball valve is connected to the oil outlet end of the plunger pump, the oil outlet end of the manual ball valve is connected to the oil inlet end of the second electromagnetic ball valve, the oil outlet end of the second electromagnetic ball valve is connected to the oil inlet end of the check valve, the oil outlet end of the check valve is connected to the oil inlet end of the fine filter, the oil outlet end of the fine filter is connected to the oil inlet end of the pressure reducing valve, the oil outlet end of the pressure reducing valve is connected to the oil inlet end of the third electromagnetic ball valve, the oil outlet end of the third electromagnetic ball valve is connected to the oil inlet end of the accumulator through the sixth electromagnetic ball valve, the oil outlet end of the third electromagnetic ball valve is connected to the oil inlet end of the speed regulating valve through the fifth electromagnetic ball valve, and the oil outlet end of the speed regulating valve is connected to the driving oil circuit P port and the actuator;

[0009] The actuator C includes a mass load, a piston rod connecting plate and two driving buffer cylinders. The driving buffer cylinder includes a piston rod. The top of the piston rod is connected to the top of the inner wall of the driving buffer cylinder by a spring. A buffer knife edge is arranged around the middle section of the inner wall of the driving buffer cylinder. The bottom of the piston rod passes through the buffer knife edge and extends to the outside of the driving buffer cylinder. The bottom of the piston rod is connected to the top of the piston rod connecting plate. The top of the piston rod connecting plate is located between the two piston rods and is provided with a mass load. The oil outlet end of the speed control valve is connected to the cylinder cavity of the driving buffer cylinder, and the cylinder cavity of the other driving buffer cylinder is connected through the oil circuit between the PT ports of the driving oil circuit.

[0010] An oil suction filter is arranged in the oil circuit between the plunger pump and the oil tank.

[0011] An air filter is also provided on the oil tank.

[0012] One end of the pressure measuring hose is connected to the oil path between the one-way valve and the fine filter, and the other end of the pressure measuring hose is connected to the pressure measuring joint.

[0013] The pressure measuring hose is provided with a pressure sensor, and the pressure measuring joint is provided with a pressure gauge.

[0014] The oil outlet of the accumulator is connected to the oil inlet of the seven solenoid valves, the oil outlet of the seven solenoid valves is connected to the oil inlet of a large-diameter cartridge relief valve, and the oil outlet of the large-diameter cartridge relief valve is connected to the oil inlet of the oil tank through the power oil circuit T port.

[0015] The oil outlet of the speed regulating valve is connected to the oil inlet of the second throttle valve, the oil outlet of the second throttle valve is connected to the oil inlet of the four electromagnetic ball valves, and the oil outlet of the four electromagnetic ball valves is connected to the oil inlet of the oil tank through the power oil circuit T port.

[0016] The oil outlet end of the speed regulating valve is connected to the oil inlet end of a throttle valve, the oil outlet end of a throttle valve is connected to the oil inlet ends of two one-way valves, the oil outlet ends of the two one-way valves are connected to the oil inlet ends of two large-diameter cartridge overflow valves, and the oil outlet ends of the two large-diameter cartridge overflow valves are connected to the water tank.

[0017] The oil outlet end of the driving buffer oil cylinder is connected to the oil inlet end of the large-diameter cartridge valve through the driving oil circuit T, and the oil outlet end of the large-diameter cartridge valve is connected to the water tank.

[0018] Two pressure sensors are arranged between the oil circuit of the speed regulating valve and the water tank.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In a hydraulic control system integrating driving and buffering of the present invention, the oil inlet end of a manual ball valve is connected to the oil outlet end of a plunger pump, the oil outlet end of a manual ball valve is connected to the oil inlet end of two electromagnetic ball valves, the oil outlet end of the two electromagnetic ball valves is connected to the oil inlet end of a check valve, the oil outlet end of the check valve is connected to the oil inlet end of a fine filter, the oil outlet end of the fine filter is connected to the oil inlet end of a pressure reducing valve, the oil outlet end of the pressure reducing valve is connected to the oil inlet end of three electromagnetic ball valves, the oil outlet end of the three electromagnetic ball valves is connected to the oil inlet end of an accumulator via six electromagnetic ball valves, the oil outlet end of the three electromagnetic ball valves is connected to the oil inlet end of a speed regulating valve via five electromagnetic ball valves, and the speed regulating valve is connected to the oil inlet end of a speed regulating valve. The oil outlet is connected to the drive oil circuit P port and the actuator C. The drive and buffer control circuit mainly selects different types of valves through valve performance and function, and combines accumulators at the same time, and then controls the opening and closing of valves through different logical control relationships to achieve the functional requirements of the actuator under different working conditions. The drive control circuit has the functions of instantaneous pressure buildup to provide driving force and quantitative uniform speed pressure buildup to provide driving force. The buffer control circuit has the functions of small load uniform speed buffering and large load instantaneous buffering. The drive and buffer control are combined for control, which significantly improves the efficiency of the hydraulic system and enhances safety. Therefore, this design combines the drive and buffer control, which is highly safe.

[0021] 2. In a hydraulic control system integrating drive and buffering of the present invention, the power circuit includes a ball valve, an oil tank, a liquid level sensor and a temperature sensor. The oil tank is provided with a liquid level sensor, a temperature sensor and a liquid level thermometer in sequence. The oil inlet of the ball valve is connected to the oil outlet of the oil tank, the output end of the motor is connected to the plunger pump, the oil inlet of the plunger pump is connected to the oil outlet of the oil tank, the oil outlet of the plunger pump is connected to the drive and buffer control circuit B through the power oil circuit P port, the oil outlet of the plunger pump is connected to the oil inlet of the electromagnetic overflow valve, the oil outlet of the electromagnetic overflow valve is connected to the oil inlet of the oil tank through the return oil filter, the power circuit is mainly provided by the pump group for the power drive circuit to provide hydraulic oil with pressure and flow that meet the overall requirements, and the return oil filter installed on the return oil circuit can filter the impurities generated in the system to ensure that the oil cleanliness of the hydraulic system meets the system use requirements and reduce the system failure rate. Therefore, the design has high cleanliness and low failure rate.

[0022] 3. In a hydraulic control system integrating driving and buffering of the present invention, the actuator includes two driving buffer cylinders, a mass load, and a piston rod connecting plate. The driving buffer cylinder includes a piston rod. The top of the piston rod is connected to the top of the inner wall of the driving buffer cylinder by a spring. The middle section of the inner wall of the driving buffer cylinder is surrounded by a buffer blade. The bottom of the piston rod passes through the buffer blade and extends to the outside of the driving buffer cylinder. The bottom of the piston rod is connected to the top of the piston rod connecting plate. The top of the piston rod connecting plate is located between the two driving buffer cylinders and is provided with a mass load. The actuator is the final execution unit of the hydraulic control system and has driving and buffering functions. All functions and requirements of the hydraulic control system are to serve the actuator. A spring is installed on the upper part of the cylinder for driving the cylinder to automatically reset. The gap throttling is designed between the buffer blade and the cylinder for buffering. Therefore, this design has high automation and is safe to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the driving and buffering control loop in the present invention.

[0025] Figure 3 It is a structural schematic diagram of the actuator in the present invention.

[0026] In the figure: power circuit A, drive and buffer control circuit B, actuator C, ball valve 1, oil tank 101, liquid level sensor 2, temperature sensor 3, return oil filter 4, electromagnetic overflow valve 5, oil suction filter 6, plunger pump 7, motor 8, liquid level thermometer 9, air filter 10, pressure gauge 11, manual ball valve 12, manual ball valve 2 12.1, electromagnetic ball valve 2 13.2, electromagnetic ball valve 3 13.3, electromagnetic ball valve 4 13.4, electromagnetic ball valve 5 13.5, electromagnetic ball valve 6 13.6, electromagnetic valve 7 13.7, single One-way valve 14, two one-way valves 14.1, fine filter 15, a pressure sensor 16, a pressure measuring joint 17, a pressure measuring hose 18, a large-diameter cartridge relief valve 19, two large-diameter cartridge relief valves 19.1, a pressure reducing valve 20, a throttle valve 21, a large-diameter cartridge valve 22, two throttle valves 23, two pressure sensors 24, a speed regulating valve 25, an accumulator 26, a driving buffer cylinder 27, a piston rod 271, a spring 272, a buffer knife edge 273, a cylinder cavity 274, a mass load 28, a piston rod connecting plate 29, and a water tank 30. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] See also Figures 1 to 3 , a hydraulic control system integrating driving and buffering, the hydraulic control system integrating driving and buffering comprising a power circuit A, a driving and buffering control circuit B and an actuator C;

[0029] The power circuit A comprises a ball valve 1, an oil tank 101, a liquid level sensor 2 and a temperature sensor 3. The oil tank 101 is provided with a liquid level sensor 2, a temperature sensor 3 and a liquid level thermometer 9 in sequence. The oil inlet end of the ball valve 1 is connected to the oil outlet end of the oil tank 101. The output end of the motor 8 is connected to the plunger pump 7. The oil inlet end of the plunger pump 7 is connected to the oil outlet end of the oil tank 101. The oil outlet end of the plunger pump 7 is connected to the drive and buffer control circuit B through the power oil circuit P port. The oil outlet end of the plunger pump 7 is connected to the oil inlet end of the electromagnetic overflow valve 5. The oil outlet end of the electromagnetic overflow valve 5 is connected to the oil inlet end of the oil tank 101 through the return oil filter 4.

[0030] The buffer control circuit B includes a manual ball valve 12, two manual ball valves 12.1, and a one-way valve 14. The oil inlet end of the manual ball valve 12 is connected to the oil outlet end of the plunger pump 7. The oil outlet end of the manual ball valve 12 is connected to the oil inlet end of the two electromagnetic ball valves 13.2. The oil outlet end of the two electromagnetic ball valves 13.2 is connected to the oil inlet end of the one-way valve 14. The oil outlet end of the one-way valve 14 is connected to the oil inlet end of the fine filter 15. The fine filter The oil outlet of the pressure reducing valve 20 is connected to the oil inlet of the three-electromagnetic ball valve 13.3, the oil outlet of the three-electromagnetic ball valve 13.3 is connected to the oil inlet of the accumulator 26 via the six-electromagnetic ball valve 13.6, the oil outlet of the three-electromagnetic ball valve 13.3 is connected to the oil inlet of the speed regulating valve 25 via the five-electromagnetic ball valve 13.5, and the oil outlet of the speed regulating valve 25 is connected to the driving oil circuit P port and the actuator C;

[0031] The actuator C includes a mass load 28, a piston rod connecting plate 29 and two driving buffer cylinders 27. The driving buffer cylinder 27 includes a piston rod 271. The top of the piston rod 271 is connected to the top of the inner wall of the driving buffer cylinder 27 by a spring 272. A buffer blade 273 is arranged around the middle section of the inner wall of the driving buffer cylinder 27. The bottom of the piston rod 271 passes through the buffer blade 273 and extends to the outside of the driving buffer cylinder 27. The bottom of the piston rod 271 is connected to the top of the piston rod connecting plate 29. The top of the piston rod connecting plate 29 is located between the two piston rods 271 and is provided with a mass load 28. The oil outlet end of the speed control valve 25 is connected to the cylinder cavity 274 of the driving buffer cylinder 27. The cylinder cavity 274 of the other driving buffer cylinder 27 is connected through the oil circuit between the PT ports of the driving oil circuit.

[0032] An oil suction filter 6 is provided in the oil circuit between the plunger pump 7 and the oil tank 101 .

[0033] The oil tank 101 is also provided with an air filter 10 .

[0034] One end of a pressure measuring hose 18 is connected to the oil path between the one-way valve 14 and the fine filter 15 , and the other end of the pressure measuring hose 18 is connected to a pressure measuring joint 17 .

[0035] The pressure measuring hose 18 is provided with a pressure sensor 16 , and the pressure measuring joint 17 is provided with a pressure gauge 11 .

[0036] The oil outlet end of the accumulator 26 is connected to the oil inlet end of the seven solenoid valves 13.7, and the oil outlet end of the seven solenoid valves 13.7 is connected to the oil inlet end of a large-diameter cartridge relief valve 19, and the oil outlet end of the large-diameter cartridge relief valve 19 is connected to the oil inlet end of the oil tank 101 through the power oil circuit T port.

[0037] The oil outlet of the speed regulating valve 25 is connected to the oil inlet of the second throttle valve 23, the oil outlet of the second throttle valve 23 is connected to the oil inlet of the fourth electromagnetic ball valve 13.4, and the oil outlet of the fourth electromagnetic ball valve 13.4 is connected to the oil inlet of the oil tank 101 through the power oil circuit T port.

[0038] The oil outlet end of the speed regulating valve 25 is connected to the oil inlet end of a throttle valve 21, the oil outlet end of the throttle valve 21 is connected to the oil inlet end of two one-way valves 14.1, the oil outlet ends of the two one-way valves 14.1 are connected to the oil inlet ends of two large-diameter plug-in overflow valves 19.1, and the oil outlet ends of the two large-diameter plug-in overflow valves 19.1 are connected to the water tank 30.

[0039] The oil outlet end of the driving buffer oil cylinder 27 is connected to the oil inlet end of the large-diameter cartridge valve 22 through the driving oil path T, and the oil outlet end of the large-diameter cartridge valve 22 is connected to the water tank 30.

[0040] Two pressure sensors 24 are provided between the oil circuit of the speed regulating valve 25 and the water tank 30 .

[0041] The principle of the present invention is described as follows:

[0042] The oil tank 101 is used to store the hydraulic oil required by the hydraulic system. The ball valve 1 is a drain valve used to discharge the hydraulic oil in the oil tank 101 to remove the waste oil; the liquid level sensor 2, the temperature sensor 3, and the liquid level thermometer 9 are used to store and monitor the state of the hydraulic oil in the oil tank 101; the motor 8 drives the plunger pump 7 to suck the hydraulic oil in the oil tank 101, and the pressure oil generated is sent to the hydraulic control system through the power oil circuit P port through the pump outlet; the electromagnetic overflow valve 5 is used as a bypass of the pump to control the system pressure. When the electromagnetic overflow valve 5 is not powered , the system is not loaded, the oil directly enters the return oil pipeline through the electromagnetic overflow valve 5 and returns to the oil tank 101. At this time, the pump group is running without load. When the electromagnetic overflow valve 5 is energized, the system is loaded, and the oil directly enters the return oil pipeline through the electromagnetic overflow valve 5 and returns to the oil tank. At this time, the pump group is loaded and running; the oil suction filter 6 is used at the pump suction port to filter impurities in the hydraulic oil to prevent impurities from damaging the pump group; the return oil pipeline is used to receive the hydraulic oil of the return oil circuit of the actuator C and return it to the oil tank 101 through the power oil circuit T port, and is filtered by the return oil filter 4 to ensure the cleanliness of the oil.

[0043] Embodiment 1:

[0044] A hydraulic control system integrating drive and buffer, the hydraulic control system integrating drive and buffer comprises a power circuit A, a drive and buffer control circuit B and an actuator C; the power circuit A comprises a ball valve 1, an oil tank 101, a liquid level sensor 2 and a temperature sensor 3, the oil tank 101 is provided with a liquid level sensor 2, a temperature sensor 3 and a liquid level thermometer 9 in sequence, the oil inlet end of the ball valve 1 is connected to the oil outlet end of the oil tank 101, the output end of the motor 8 is connected to the plunger pump 7, the oil inlet end of the plunger pump 7 is connected to the oil outlet end of the oil tank 101, the oil outlet end of the plunger pump 7 is connected to the drive and The buffer control circuit B is connected, the oil outlet end of the plunger pump 7 is connected to the oil inlet end of the electromagnetic overflow valve 5, and the oil outlet end of the electromagnetic overflow valve 5 is connected to the oil inlet end of the oil tank 101 through the return oil filter 4; the buffer control circuit B includes a manual ball valve 12, two manual ball valves 12.1, and a one-way valve 14, the oil inlet end of the manual ball valve 12 is connected to the oil outlet end of the plunger pump 7, the oil outlet end of the manual ball valve 12 is connected to the oil inlet end of the two electromagnetic ball valves 13.2, the oil outlet end of the two electromagnetic ball valves 13.2 is connected to the oil inlet end of the one-way valve 14, the oil outlet end of the one-way valve 14 is connected to the oil inlet end of the fine filter 15, and the fine filter 1 The oil outlet of the pressure reducing valve 20 is connected to the oil inlet of the three-electromagnetic ball valve 13.3, the oil outlet of the three-electromagnetic ball valve 13.3 is connected to the oil inlet of the accumulator 26 through the six-electromagnetic ball valve 13.6, the oil outlet of the three-electromagnetic ball valve 13.3 is connected to the oil inlet of the speed regulating valve 25 through the five-electromagnetic ball valve 13.5, the oil outlet of the speed regulating valve 25 is connected to the driving oil circuit P port and the actuator C; the actuator C includes a mass load 28, a piston rod connecting plate 29 and two driving buffer cylinders 27, the driving buffer cylinder 27 includes a piston rod 271, the top of the piston rod 271 is connected to the actuator C; The tops of the inner walls of the driving buffer cylinder 27 are connected by a spring 272, a buffer blade 273 is arranged around the middle section of the inner wall of the driving buffer cylinder 27, the bottom of the piston rod 271 passes through the buffer blade 273 and extends to the outside of the driving buffer cylinder 27, the bottom of the piston rod 271 is connected to the top of the piston rod connecting plate 29, the top of the piston rod connecting plate 29 is provided with a mass load 28 between the two piston rods 271, the oil outlet end of the speed regulating valve 25 is connected to the cylinder cavity 274 of the driving buffer cylinder 27, and the cylinder cavity 274 of the other driving buffer cylinder 27 is connected through the oil circuit between the PT ports of the driving oil circuit.

[0045] The application method of the above-mentioned hydraulic control system integrating driving and buffering includes any one of the following or both:

[0046] Working condition 1: The drive control circuit has the functions of instantaneous pressure building to provide driving force and quantitative average speed pressure building to provide driving force;

[0047] The pressure oil enters through the power oil circuit P port, passes through the first manual ball valve 12.1 (closed when the pump is stopped or used for maintenance), the second electromagnetic ball valve 13.2 is powered on and opened (acting as a stop valve), the first check valve 14 (to prevent the system oil from flowing back to the pump unit and damaging the pump unit), the fine filter 15 (filtering system oil impurities), the pressure reducing valve 20 (the pressure required by the actuator can be adjusted according to the working conditions), the third electromagnetic ball valve 13.3 is powered on and opened, and the sixth electromagnetic ball valve 13.6 is powered on and opened to press the accumulator 26. When the second pressure sensor 24 detects that the pressure of the accumulator 26 reaches the set value, the third electromagnetic ball valve 13.3 loses power and closes. At this time, if the accumulator pressure is over-pressed due to untimely closing of the electromagnetic ball valve or other reasons, the seventh electromagnetic ball valve 13.7 can be powered on and opened, and then it flows back to the oil tank 101 through the relief valve 19 (the pressure is set to the pressure value required by the accumulator);

[0048] a. Instantaneous pressure buildup to provide driving force (i.e., accumulator 26 instantaneously supplies oil to actuator C): When the system receives the command to instantaneously build up pressure to provide driving force to actuator C, the five-electromagnetic ball valve 13.5 is energized to open, and the pressure oil in the accumulator is instantly delivered to actuator C through the six-electromagnetic ball valve 13.6, the five-electromagnetic ball valve 13.5, and the speed regulating valve 25 (which can adjust the pressure oil flow rate to control the speed of the actuator);

[0049] b. Quantitative and average speed pressure buildup to provide driving force (the pump group supplies quantitative oil to actuator C): After the system receives the instruction of quantitative and average speed pressure buildup to provide driving force for the actuator, the six electromagnetic ball valves 13.6 lose power and close, the pump group is energized and loaded to send the pressure oil in, and then it is sent to the actuator through the manual ball valve 12, the second electromagnetic ball valve 13.2 is energized to open, the one-way valve 14, the fine filter 15, the pressure reducing valve 20, the third electromagnetic ball valve 13.3 is energized to open, the sixth electromagnetic ball valve 13.6 is energized to open, the fifth electromagnetic ball valve 13.5 is energized to open, and the speed control valve 25.

[0050] Working condition 2: The buffer control circuit has the functions of small load average speed buffering and large load instantaneous buffering;

[0051] a. Small load average speed buffer: After the system receives the instruction that the small load average speed buffer provides buffering force for the actuator C, the fifth solenoid ball valve 13.5 loses power and closes, and the oil of the actuator C flows back through P (T), through the throttle valve 23, the fourth solenoid ball valve 13.4 is powered on and opened, and the second manual ball valve 12.1 flows back to the oil tank 101;

[0052] b. Instantaneous buffering of large loads: After the system receives the instruction of instantaneous buffering of large loads to provide buffering force for the actuator, the five electromagnetic ball valves 13.5 lose power and close, and the oil of the actuator C flows back through P(T), through the throttle valve 23, the four electromagnetic ball valves 13.4 are powered on and open, and the two manual ball valves 12.1 flow back to the oil tank 101. However, since the load is large at this time, the instantaneous flow of the actuator C is large, and the flow does not have time to flow back to the oil tank 101 through the four electromagnetic ball valves 13.4. At this time, the pressure is too large, and the flow is too large to open the two large-diameter cartridge valves 22 (for instantaneous large-flow release of hydraulic oil) and the one large-diameter cartridge relief valve 19 (actuator pressure protection valve), and the pressure oil quickly flows back to the oil 101. The opening of the two large-diameter cartridge valves 22 and the one large-diameter cartridge relief valve 19 can make the oil flow back quickly, thereby avoiding the risk of the actuator C being damaged by the instantaneous excessive oil pressure inside the actuator C.

[0053] Embodiment 2:

[0054] Embodiment 2 is substantially the same as Embodiment 1, except that:

[0055] The power circuit A includes a ball valve 1, an oil tank 101, a liquid level sensor 2 and a temperature sensor 3. The oil tank 101 is provided with a liquid level sensor 2, a temperature sensor 3 and a liquid level thermometer 9 in sequence. The oil inlet end of the ball valve 1 is connected to the oil outlet end of the oil tank 101, and the output end of the motor 8 is connected to the plunger pump 7. The oil inlet end of the plunger pump 7 is connected to the oil outlet end of the oil tank 101, and the oil outlet end of the plunger pump 7 is connected to the drive and buffer control circuit B through the power oil circuit P port. The oil outlet end of the plunger pump 7 is connected to the oil inlet end of the electromagnetic overflow valve 5, and the oil outlet end of the electromagnetic overflow valve 5 is connected to the oil inlet end of the oil tank 101 through the return oil filter 4. An oil suction filter 6 is provided in the oil circuit between the plunger pump 7 and the oil tank 101, and an air filter 10 is also provided on the oil tank 101.

[0056] Embodiment 3:

[0057] Embodiment 3 is substantially the same as Embodiment 2, except that:

[0058] A hydraulic control system integrating drive and buffering, wherein the oil circuit between the one-way valve 14 and the fine filter 15 is connected to one end of a pressure hose 18, and the other end of the pressure hose 18 is connected to a pressure connector 17; a pressure sensor 16 is provided on the pressure hose 18, and a pressure gauge 11 is provided on the pressure connector 17; the oil outlet end of the accumulator 26 is connected to the oil inlet end of the seven solenoid valves 13.7, and the oil outlet end of the seven solenoid valves 13.7 is connected to the oil inlet end of a large-diameter cartridge relief valve 19, and the oil outlet end of the large-diameter cartridge relief valve 19 is connected to the oil inlet end of the oil tank 101 through the power oil circuit T port The oil outlet end of the speed regulating valve 25 is connected with the oil inlet end of the second throttle valve 23, the oil outlet end of the second throttle valve 23 is connected with the oil inlet end of the four electromagnetic ball valves 13.4, and the oil outlet end of the four electromagnetic ball valves 13.4 is connected with the oil inlet end of the oil tank 101 through the power oil circuit T port; the oil outlet end of the speed regulating valve 25 is connected with the oil inlet end of a throttle valve 21, the oil outlet end of a throttle valve 21 is connected with the oil inlet end of the two check valves 14.1, the oil outlet end of the two check valves 14.1 is connected with the oil inlet end of two large-diameter plug-in overflow valves 19.1, and the oil outlet end of the two large-diameter plug-in overflow valves 19.1 is connected with the water tank 30.

[0059] Embodiment 4:

[0060] Embodiment 4 is substantially the same as Embodiment 3, except that:

[0061] A hydraulic control system integrating driving and buffering, wherein the actuator C comprises two driving buffer cylinders 27, a mass load 28, and a piston rod connecting plate 29. The driving buffer cylinder 27 comprises a piston rod 271, and the top of the piston rod 271 is connected to the top of the inner wall of the driving buffer cylinder 27 by a spring 272. A buffer blade 273 is arranged around the middle section of the inner wall of the driving buffer cylinder 27. The buffer blade 273 and the driving buffer cylinder 27 are designed with a gap throttling for buffering. The bottom of the piston rod 271 passes through the buffer blade 273 and extends to the outside of the driving buffer cylinder 27. The bottom of the piston rod 271 and the top of the piston rod connecting plate 29 are connected to each other. The top of the piston rod connecting plate 29 is located between the two driving buffer cylinders 27 and a mass load 28 is arranged. The oil outlet end of the speed regulating valve 25 is connected with the oil inlet chamber of the driving buffer cylinder 27, and the oil outlet end of the driving buffer cylinder 27 is connected with the buffer control circuit B through the driving oil circuit T port. The driving buffer cylinder 27 has an oil port P (T) for oil inlet and outlet, which is both an oil inlet and an oil return port. The oil outlet end of the driving buffer cylinder 27 is connected with the oil inlet end of the large-diameter cartridge valve 22 through the driving oil circuit T, and the oil outlet end of the large-diameter cartridge valve 22 is connected with the water tank 30; two pressure sensors 24 are arranged between the oil circuit of the speed regulating valve 25 and the water tank 30.

[0062] The actuator C motion working conditions have the following three working conditions:

[0063] a. Driving working condition: The pressure oil enters the driving buffer cylinder 27 through P from the driving buffer control circuit. Under the action of the pressure oil, the force of the spring 272 is overcome to drive the cylinder piston stem 271 to move upward. The piston rod 271 drives the piston rod connecting plate 29 to move upward to drive the mass load 28 to move upward synchronously;

[0064] b. Reset working condition: After the mass load reaches the position, it falls back to the piston rod connecting plate 29 at a speed close to zero and moves downward in the opposite direction by the weight of the mass load 28. The driving and buffering hydraulic circuit switches to the small load uniform speed buffer working condition. The reset spring 272 in the driving buffer cylinder 27 discharges the hydraulic oil in the driving buffer cylinder 27 to the return oil circuit through the T port under the action of the spring force;

[0065] c. Buffering condition: After the mass load 28 reaches the position, it drops back to the piston rod connecting plate 29 at high speed. At this time, the high impact force and the weight of the mass load 28 move downward rapidly in the opposite direction, and the driving and buffering hydraulic circuits automatically switch to the large-load instantaneous buffering condition, driving the buffer cylinder 27 to perform buffering braking through the buffering throttling design of the buffer blade 273. At this time, due to the fast speed, the instantaneous flow rate and pressure in the driving buffer cylinder 27 are large, and the instantaneous large-flow high-pressure pressure oil is instantly discharged through the T port and flows into the buffer circuit, opening the large-flow large-diameter cartridge valve 22 and the second large-diameter cartridge overflow valve 19.1, and the pressure oil quickly flows back to the oil tank 101.

[0066] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A hydraulic control system integrating drive and buffer, characterized in that : The hydraulic control system integrating driving and buffering comprises a power circuit (A), a driving and buffering control circuit (B) and an actuator (C); The power circuit (A) comprises a ball valve (1), an oil tank (101), a liquid level sensor (2) and a temperature sensor (3); the oil tank (101) is provided with a liquid level sensor (2), a temperature sensor (3) and a liquid level thermometer (9) in sequence; the oil inlet end of the ball valve (1) is connected to the oil outlet end of the oil tank (101); the output end of the motor (8) is connected to a plunger pump (7); the oil inlet end of the plunger pump (7) is connected to the oil outlet end of the oil tank (101); the oil outlet end of the plunger pump (7) is connected to the drive and buffer control circuit (B) via a power oil circuit P port; the oil outlet end of the plunger pump (7) is connected to the oil inlet end of the electromagnetic overflow valve (5); the oil outlet end of the electromagnetic overflow valve (5) is connected to the oil inlet end of the oil tank (101) via an oil return filter (4); The buffer control circuit (B) comprises a manual ball valve (12), two manual ball valves (12.1), and a check valve (14); the oil inlet end of the manual ball valve (12) is connected to the oil outlet end of the plunger pump (7); the oil outlet end of the manual ball valve (12) is connected to the oil inlet end of the two electromagnetic ball valves (13.2); the oil outlet end of the two electromagnetic ball valves (13.2) is connected to the oil inlet end of the check valve (14); the oil outlet end of the check valve (14) is connected to the oil inlet end of the fine filter (15); the fine filter The oil outlet of the pressure reducing valve (15) is connected to the oil inlet of the pressure reducing valve (20), the oil outlet of the pressure reducing valve (20) is connected to the oil inlet of the three-electromagnetic ball valve (13.3), the oil outlet of the three-electromagnetic ball valve (13.3) is connected to the oil inlet of the accumulator (26) via the six-electromagnetic ball valve (13.6), the oil outlet of the three-electromagnetic ball valve (13.3) is connected to the oil inlet of the speed regulating valve (25) via the five-electromagnetic ball valve (13.5), the oil outlet of the speed regulating valve (25) is connected to the driving oil circuit P port and the actuator (C); The actuator (C) comprises a mass load (28), a piston rod connecting plate (29) and two driving buffer cylinders (27). The driving buffer cylinder (27) comprises a piston rod (271). The top of the piston rod (271) is connected to the top of the inner wall of the driving buffer cylinder (27) via a spring (272). A buffer knife edge (273) is arranged around the middle section of the inner wall of the driving buffer cylinder (27). The bottom of the piston rod (271) passes through the buffer knife edge (273) and extends to the outside of the driving buffer cylinder (27). The bottom of the piston rod (271) is connected to the top of the piston rod connecting plate (29). The top of the piston rod connecting plate (29) is provided with a mass load (28) between the two piston rods (271). The oil outlet end of the speed regulating valve (25) is communicated with the cylinder chamber (274) of the driving buffer cylinder (27). The cylinder chamber (274) of the other driving buffer cylinder (27) is communicated via the oil path between the PT ports of the driving oil path.

2. A hydraulic control system integrating driving and buffering according to claim 1, characterized in that: An oil suction filter (6) is provided in the oil circuit between the plunger pump (7) and the oil tank (101).

3. The hydraulic control system integrating driving and buffering according to claim 1, characterized in that: An air filter (10) is also provided on the oil tank (101).

4. The hydraulic control system integrating driving and buffering according to claim 1, characterized in that: The oil path between the one-way valve (14) and the fine filter (15) is connected to one end of a pressure measuring hose (18), and the other end of the pressure measuring hose (18) is connected to a pressure measuring joint (17).

5. The hydraulic control system integrating driving and buffering according to claim 4, characterized in that: The pressure measuring hose (18) is provided with a pressure sensor (16), and the pressure measuring joint (17) is provided with a pressure gauge (11).

6. The hydraulic control system integrating driving and buffering according to claim 1, characterized in that: The oil outlet of the accumulator (26) is connected to the oil inlet of the seven solenoid valves (13.7), the oil outlet of the seven solenoid valves (13.7) is connected to the oil inlet of a large-diameter cartridge relief valve (19), and the oil outlet of the large-diameter cartridge relief valve (19) is connected to the oil inlet of the oil tank (101) via the power oil circuit T port.

7. The hydraulic control system integrating driving and buffering according to claim 1, characterized in that: The oil outlet end of the speed regulating valve (25) is connected to the oil inlet end of the second throttle valve (23), the oil outlet end of the second throttle valve (23) is connected to the oil inlet end of the fourth electromagnetic ball valve (13.4), and the oil outlet end of the fourth electromagnetic ball valve (13.4) is connected to the oil inlet end of the oil tank (101) via the power oil circuit T port.

8. A hydraulic control system integrating driving and buffering according to claim 1 or 7, characterized in that: The oil outlet end of the speed regulating valve (25) is connected to the oil inlet end of a throttle valve (21), the oil outlet end of the throttle valve (21) is connected to the oil inlet ends of two one-way valves (14.1), the oil outlet ends of the two one-way valves (14.1) are connected to the oil inlet ends of two large-diameter plug-in overflow valves (19.1), and the oil outlet ends of the two large-diameter plug-in overflow valves (19.1) are connected to the water tank (30).

9. The hydraulic control system integrating driving and buffering according to claim 8, characterized in that: The oil outlet end of the driving buffer oil cylinder (27) is connected to the oil inlet end of the large-diameter cartridge valve (22) via the driving oil path T, and the oil outlet end of the large-diameter cartridge valve (22) is connected to the water tank (30).

10. The hydraulic control system integrating driving and buffering according to claim 8, characterized in that: Two pressure sensors (24) are provided between the oil circuit of the speed regulating valve (25) and the water tank (30).

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