Large-flow synchronous driving hydraulic system

Abstract

A large-flow synchronous driving hydraulic system comprises an oil tank pump set unit, an energy accumulator unit, a proportional valve set control unit, a manual valve set control unit and an oil cylinder and control valve set integration unit, an oil drainage ball valve is arranged on an oil tank, the oil outlet end of the oil tank is communicated with the oil inlet end of the ball valve, the oil outlet end of the ball valve is communicated with the oil inlet end of a constant displacement pump, and the oil outlet end of the constant displacement pump is communicated with the oil tank. A flexible connector is arranged on an oil way between the ball valve and the metering pump, the metering pump is electrically connected with the motor, the oil outlet end of the metering pump is communicated with the oil inlet end of the high-pressure filter, the oil outlet end of the high-pressure filter is communicated with the oil inlet end of the one-way valve, and the oil outlet end of the one-way valve is communicated with the oil inlet end of an energy accumulator in the energy accumulator unit through a pressure oil outlet. A second stop valve is arranged between the one-way valve and the oil way of the P port in the energy accumulator unit, the oil outlet end of the energy accumulator is communicated with the oil inlet end of a third stop valve, and a third pressure gauge is arranged on the oil way between the energy accumulator and the third stop valve. According to the invention, the oil cylinder can be safely driven under the condition that the pressure fluctuation is increased.

Description

Technical Field

[0001] The invention relates to an improvement in the technology of a synchronously driven hydraulic system, belongs to the field of hydraulic control, and in particular to a large-flow synchronously driven hydraulic system. 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. The synchronous drive hydraulic system is a high-performance hydraulic system that can ensure that multiple hydraulic actuators work synchronously at the same speed or displacement. This system is particularly important in the field of large machinery and precision control because they can improve processing quality, enhance the dynamic response and overall performance of the system. When working at a large flow rate, the pressure fluctuation of the hydraulic system may increase, causing damage to some parts and valves, affecting the pressure balance of the system, thereby affecting the synchronization effect, making the existing synchronous drive hydraulic system unable to safely drive the cylinder when the pressure fluctuation increases.

[0003] A Chinese patent application with application number CN202011180645.X and application date October 29, 2020 discloses a large-flow cylinder hydraulic control system, the hydraulic control system comprising: an actuator cylinder, a booster cylinder, a pressure oil tank, a motor, a metering pump and a tank, the power output end of the motor is transmission-coordinated with the power input end of the metering pump, the oil outlet end of the tank is connected to the oil inlet end of the metering pump, the oil outlet end of the metering pump is simultaneously connected to the oil inlet of the overflow valve and the oil inlet of the first check valve, the oil outlet of the first check valve is simultaneously connected to the B working oil port of the two-way directional valve, the P2 oil port of the first hydraulically controlled check valve, the P2 oil port of the second hydraulically controlled check valve, the P2 oil port of the third hydraulically controlled check valve and the T oil port of the sixth directional valve, the A working oil port of the two-way directional valve is simultaneously connected to the P oil port of the eighth directional valve, the B working oil port of the seventh directional valve, and the P oil port of the ninth directional valve. This design is suitable for short-time, high-load working conditions, but the above solution still does not solve the problem of being unable to safely drive the cylinder under high flow conditions.

[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 the oil cylinder cannot be safely driven when the pressure fluctuation increases, and to provide a large-flow synchronous drive hydraulic system that can safely drive the oil cylinder when the pressure fluctuation increases.

[0006] To achieve the above objectives, the technical solution of the present invention is: a large flow synchronous drive hydraulic system, the large flow synchronous drive hydraulic system includes a tank pump group unit, an accumulator unit, a proportional valve group control unit, a manual valve group control unit and a cylinder and control valve group integrated unit, the tank pump group unit includes a tank, a ball valve, a high-pressure filter, a one-way valve and a return oil filter, the accumulator unit includes a relief valve, a pressure relay and an accumulator, the proportional valve group control unit includes a first proportional servo valve, a second proportional servo valve, and the manual valve group control unit includes a manual reversing valve; The oil tank is provided with an oil drain ball valve, the oil outlet end of the oil tank is connected with the oil inlet end of the ball valve, the oil outlet end of the ball valve is connected with the oil inlet end of the metering pump, a flexible connector is provided on the oil circuit between the ball valve and the metering pump, the metering pump is electrically connected to the motor, the oil outlet end of the metering pump is connected with the oil inlet end of the high-pressure filter, the oil outlet end of the high-pressure filter is connected with the oil inlet end of the one-way valve, the oil outlet end of the one-way valve is connected with the oil inlet end of the accumulator in the accumulator unit through the pressure oil outlet, and a second stop valve is provided between the one-way valve and the oil circuit of the P port in the accumulator unit; The oil outlet of the accumulator is connected to the oil inlet of the third stop valve, a third pressure gauge is provided on the oil circuit between the accumulator and the third stop valve, a pressure relay and a second pressure gauge are provided on the oil inlet of the accumulator, the pressure relay is connected to the oil inlet of the relief valve, and the oil outlet of the relief valve is connected to the T port in the accumulator unit; The oil outlet of the one-way valve is connected to the P port of the first proportional servo valve, the A port of the first proportional servo valve is connected to the oil inlet of the oil cylinder and the control valve group integrated unit, the oil outlet of the oil cylinder and the control valve group integrated unit is connected to the B port of the first proportional servo valve, and the T port of the first proportional servo valve is connected to the oil return port of the oil tank after passing through the oil return filter; The oil outlet of the one-way valve is communicated with the P port of the second proportional servo valve, the A port of the second proportional servo valve is communicated with the oil inlet of the oil cylinder and the control valve group integrated unit E, the oil outlet of the oil cylinder and the control valve group integrated unit E is communicated with the B port of the second proportional servo valve, the T port of the second proportional servo valve is communicated with the oil return port of the oil tank after passing through the return oil filter, the P port of the second proportional servo valve is communicated with the oil inlet of the oil tank, and a first stop valve is provided on the oil line between the second proportional servo valve and the oil tank; An accumulator pressure relief ball valve is provided between the A port of the first proportional servo valve and the oil tank, and between the A port of the second proportional servo valve and the oil tank; The oil outlet of the one-way valve is connected to the P port of the manual reversing valve, the A port of the manual reversing valve is connected to the oil inlet of the oil cylinder and the control valve group integrated unit E, the oil outlet of the oil cylinder and the control valve group integrated unit E is connected to the B port of the manual reversing valve, and the T port of the manual reversing valve is connected to the oil return port of the oil tank after passing through the oil return filter; The oil cylinder and control valve group integrated unit comprises a first oil cylinder control valve group and a second oil cylinder control valve group, the first oil cylinder control valve group comprises a first oil cylinder, the rod chamber of the first oil cylinder is connected to the oil outlet end of the first hydraulically controlled one-way valve, the oil outlet end of the first hydraulically controlled one-way valve is connected to the oil return port of the oil tank, the oil inlet end of the first hydraulically controlled one-way valve is connected to the oil outlet end of the first one-way throttle valve, and the oil inlet end of the first one-way throttle valve is connected to the A port of the manual reversing valve; The rodless chamber of the first oil cylinder is connected to the oil outlet end of the second hydraulically controlled one-way valve, the oil outlet end of the second hydraulically controlled one-way valve is connected to the oil return port of the oil tank, the oil inlet end of the second hydraulically controlled one-way valve is connected to the oil outlet end of the second one-way throttle valve, the oil inlet end of the second one-way throttle valve is connected to the B port of the manual reversing valve, and a first overflow valve is provided between the second hydraulically controlled one-way valve and the second one-way throttle valve; The second oil cylinder control valve group includes a second oil cylinder, a rod chamber of the second oil cylinder is connected to the oil outlet end of the third hydraulically controlled one-way valve, the oil outlet end of the third hydraulically controlled one-way valve is connected to the oil return port of the oil tank, the oil inlet end of the third hydraulically controlled one-way valve is connected to the oil outlet end of the third one-way throttle valve, and the oil inlet end of the third one-way throttle valve is connected to the A port of the manual reversing valve; The rodless chamber of the second oil cylinder is connected to the oil outlet end of the fourth hydraulically controlled one-way valve, the oil outlet end of the fourth hydraulically controlled one-way valve is connected to the oil return port of the oil tank, the oil inlet end of the fourth hydraulically controlled one-way valve is connected to the oil outlet end of the fourth one-way throttle valve, the oil inlet end of the fourth one-way throttle valve is connected to the B port of the manual reversing valve, and a second overflow valve is arranged between the fourth hydraulically controlled one-way valve and the fourth one-way throttle valve.

[0007] The oil outlet end of the high-pressure filter is communicated with the oil inlet end of the electromagnetic overflow valve, the oil outlet end of the high-pressure filter is communicated with the oil inlet end of the first pressure gauge, and a first pressure measuring joint is provided in the oil circuit between the electromagnetic overflow valve and the first pressure gauge; The oil outlet end of the electromagnetic overflow valve is communicated with the oil inlet end of the oil tank.

[0008] A second pressure measuring joint is provided in the oil circuit between the one-way valve and the accumulator unit.

[0009] A third stop valve is arranged on the oil path between the accumulator and the P port in the accumulator unit, and a fourth stop valve is arranged on the oil path between the accumulator and the T port in the accumulator unit.

[0010] A third pressure measuring joint is provided on the oil circuit between the one-way valve and the P port of the first proportional servo valve, and a fourth pressure measuring joint is provided on the oil circuit between the T port of the first proportional servo valve and the return oil filter; A ninth pressure measuring joint is provided in the oil circuit between the A port of the first proportional servo valve and the oil cylinder and the control valve group integrated unit E, and a tenth pressure measuring joint is provided in the oil circuit between the B port of the first proportional servo valve and the oil cylinder and the control valve group integrated unit E.

[0011] A seventh pressure measuring joint is provided on the oil circuit between the one-way valve and the P port of the manual reversing valve, and an eighth pressure measuring joint is provided on the oil circuit between the T port of the manual reversing valve and the oil tank; A thirteenth pressure measuring joint is arranged between the A port of the manual reversing valve and the oil circuit of the oil cylinder and the control valve group integrated unit, and a fourteenth pressure measuring joint is arranged between the B port of the manual reversing valve and the oil circuit of the oil cylinder and the control valve group integrated unit.

[0012] A fifteenth pressure measuring joint is provided on the oil inlet line of the first one-way throttle valve, and a sixteenth pressure measuring joint is provided on the oil inlet line of the second one-way throttle valve; A nineteenth pressure measuring joint is arranged on the oil outlet line of the first one-way throttle valve, and a twentieth pressure measuring joint is arranged on the oil outlet line of the second one-way throttle valve.

[0013] A seventeenth pressure measuring joint is provided on the oil inlet line of the third one-way throttle valve, and an eighteenth pressure measuring joint is provided on the oil inlet line of the fourth one-way throttle valve; A twenty-first pressure measuring joint is provided on the oil outlet line of the third one-way throttle valve, and a twenty-second pressure measuring joint is provided on the oil outlet line of the fourth one-way throttle valve.

[0014] A fifth stop valve is provided between the first one-way throttle valve and the port A of the manual reversing valve, and a seventh stop valve is provided between the third one-way throttle valve and the port A of the manual reversing valve; A sixth stop valve is arranged between the first one-way throttle valve and the B port of the manual reversing valve, and an eighth stop valve is arranged between the third one-way throttle valve and the B port of the manual reversing valve.

[0015] A liquid level gauge, an air filter, and an oil filling ball valve are sequentially arranged in the oil tank, and a ninth stop valve and a tenth stop valve are arranged on the air filter.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In a large-flow synchronous drive hydraulic system of the present invention, an oil drain ball valve is arranged on the oil tank, the oil outlet end of the oil tank is connected with the oil inlet end of the ball valve, the oil outlet end of the ball valve is connected with the oil inlet end of the metering pump, a flexible connector is arranged on the oil circuit between the ball valve and the metering pump, the metering pump is electrically connected to the motor, the oil outlet end of the metering pump is connected with the oil inlet end of the high-pressure filter, the oil outlet end of the high-pressure filter is connected with the oil inlet end of the one-way valve, the oil outlet end of the one-way valve is connected with the oil inlet end of the accumulator in the accumulator unit through the pressure oil outlet, a second stop valve is arranged between the one-way valve and the oil circuit of the P port in the accumulator unit, when the pressure increases during use, that is, when the pressure added to the accumulator is higher than the set value, the pressure relay transmits the command to the control system, and the control system controls the pump group to stop the pump to stop replenishing the accumulator The pressure oil is charged, and the accumulator is kept on standby at this time. The proportional valve group control unit controls the extension or retraction displacement of the oil cylinder in a closed loop according to the feedback signal of the displacement sensor integrated on the oil cylinder, adjusts the flow and pressure of each oil cylinder in real time, and accurately realizes the synchronous control of the oil cylinder to ensure the safe driving of the oil cylinder under high pressure; when the pressure of the accumulator is lower than the set value, the pressure relay transmits the command to the control system, and the control system controls the pump group to start the output pressure oil to be replenished into the accumulator through the third stop valve to replenish the pressure oil for the accumulator. In addition, the pump group is used to replenish the oil for the accumulator so that the accumulator can provide sufficient hydraulic driving force for the driving mechanism. The accumulator unit is pressurized and the instantaneous pressure release method is used to provide an instantaneous large flow hydraulic driving force for a specific working condition, thereby quickly driving the oil cylinder. Therefore, the present invention can safely drive the oil cylinder when the pressure fluctuation increases.

[0017] 2. In a large flow synchronous drive hydraulic system of the present invention, when the accumulator pressure is lower than the set value, the control system controls the pump group to start to replenish the pressure oil for the accumulator; when the accumulator pressure is higher than the set value, the control system controls the pump group to stop replenishing the pressure oil for the accumulator, and the manual valve group control unit is a backup unit. When the whole system loses power, if the drive mechanism still needs to perform an action, the combination of the accumulator unit, the manual reversing valve group, and the one-way throttle valve is used to realize emergency synchronous drive. Therefore, the present invention is safe to use and stable in operation.

[0018] 3. In a large flow synchronous drive hydraulic system of the present invention, the cylinder and control valve group integrated unit includes a first oil cylinder control valve group and a second oil cylinder control valve group, the first oil cylinder control valve group includes a first oil cylinder, the rod chamber of the first oil cylinder is connected to the oil outlet end of the first hydraulic control one-way valve, the oil outlet end of the first hydraulic control one-way valve is connected to the oil return port of the oil tank, the oil inlet end of the first hydraulic control one-way valve is connected to the oil outlet end of the first one-way throttle valve, and the oil inlet end of the first one-way throttle valve is connected to the A port of the manual reversing valve. When used, the oil cylinder and control valve group integrated unit mainly realizes the pressure release and pressure maintenance after the oil cylinder is extended or retracted into place, and can also adjust the speed of the one-way throttle valve to control the extension or retraction of the oil cylinder. Therefore, the present invention is easy to adjust and responds quickly.

[0019] 4. In a large flow synchronous drive hydraulic system of the present invention, a second pressure measuring joint is provided in the oil circuit between the one-way valve and the accumulator unit, a third stop valve is provided in the oil circuit between the accumulator and the P port in the accumulator unit, and a fourth stop valve is provided in the oil circuit between the accumulator and the T port in the accumulator unit. When in use, the accumulator unit is in a standby state after pressurization. If the subsequent working condition action is cancelled due to other reasons, the manual stop valve under the accumulator can be opened at this time, and the pressure oil inside the accumulator group can directly return to the oil tank through the return oil pipeline to prevent safety accidents caused by the long-term high pressure of the accumulator. Therefore, the present invention is safe to use and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the oil circuit diagram of the present invention.

[0021] Figure 2 It is a schematic diagram of the oil circuit of the oil tank pump unit in the present invention.

[0022] Figure 3 It is a schematic diagram of the oil circuit of the accumulator unit in the present invention.

[0023] Figure 4 It is a schematic diagram of the oil circuit of the proportional valve group control unit in the present invention.

[0024] Figure 5 It is a schematic diagram of the oil circuit of the manual valve group control unit in the present invention.

[0025] Figure 6 It is a schematic diagram of the oil circuit of the oil cylinder and control valve group integrated unit in the present invention.

[0026] Figure 7 It is a schematic diagram of the oil circuit of the first oil cylinder in the present invention.

[0027] Figure 8 It is a schematic diagram of the oil circuit of the second oil cylinder in the present invention.

[0028] In the figure: oil tank pump unit A, accumulator unit B, proportional valve group control unit C, manual valve group control unit D, oil cylinder and control valve group integrated unit E, oil discharge ball valve 1, oil tank 2, liquid level gauge 3, ninth stop valve 41, tenth stop valve 42, air filter 5, oil filling ball valve 6, ball valve 7, flexible connector 8, motor 9, quantitative pump 10, high pressure filter 11, first pressure measuring joint 121, second pressure measuring joint 122, third pressure measuring joint 123, fourth pressure measuring joint 124, seventh pressure measuring joint 127, eighth pressure measuring joint 128, ninth pressure measuring joint 129, tenth pressure measuring joint 1210, thirteenth pressure measuring joint 1213, fourteenth pressure measuring joint 1214, fifteenth pressure measuring joint 1215, sixteenth pressure measuring joint 1216, seventeenth pressure measuring joint 1217, eighteenth pressure measuring joint 1218, nineteenth pressure measuring joint 1219, twentieth pressure measuring joint 1220, The twenty-first pressure measuring joint 1221, the twenty-second pressure measuring joint 1222, the third pressure gauge 133, the one-way valve 14, the electromagnetic relief valve 15, the first stop valve 161, the second stop valve 162, the third stop valve 163, the fourth stop valve 164, the relief valve 17, the pressure relay 18, the accumulator 19, the first proportional servo valve 201, the second proportional servo valve 202, the manual reversing valve 21, the fifth stop valve 221, the sixth stop valve 2 22, the seventh stop valve 224, the eighth stop valve 223, the return oil filter 23, the first one-way throttle valve 231, the second one-way throttle valve 232, the third one-way throttle valve 233, the fourth one-way throttle valve 234, the first overflow valve 241, the second overflow valve 242, the first hydraulically controlled one-way valve 251, the second hydraulically controlled one-way valve 252, the third hydraulically controlled one-way valve 253, the fourth hydraulically controlled one-way valve 254, the first oil cylinder 261, and the second oil cylinder 262. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] See also Figures 1 to 8 A large flow synchronous drive hydraulic system, the large flow synchronous drive hydraulic system includes a tank pump unit A, an accumulator unit B, a proportional valve group control unit C, a manual valve group control unit D and a cylinder and control valve group integrated unit E, the tank pump unit A includes a tank 2, a ball valve 7, a high pressure filter 11, a check valve 14 and a return oil filter 23, the accumulator unit B includes a relief valve 17, a pressure relay 18 and an accumulator 19, the proportional valve group control unit C includes a first proportional servo valve 201, a second proportional servo valve 202, and the manual valve group control unit D includes a manual reversing valve 21; The oil tank 2 is provided with an oil drain ball valve 1, the oil outlet end of the oil tank 2 is connected with the oil inlet end of the ball valve 7, the oil outlet end of the ball valve 7 is connected with the oil inlet end of the metering pump 10, a flexible connector 8 is provided on the oil circuit between the ball valve 7 and the metering pump 10, the metering pump 10 is electrically connected with the motor 9, the oil outlet end of the metering pump 10 is connected with the oil inlet end of the high-pressure filter 11, the oil outlet end of the high-pressure filter 11 is connected with the oil inlet end of the one-way valve 14, the oil outlet end of the one-way valve 14 is connected with the oil inlet end of the accumulator 19 in the accumulator unit B through the pressure oil outlet, and a second stop valve 162 is provided between the one-way valve 14 and the oil circuit of the P port in the accumulator unit B; The oil outlet of the accumulator 19 is connected to the oil inlet of the third stop valve 163, a third pressure gauge 133 is provided on the oil circuit between the accumulator 19 and the third stop valve 163, a pressure relay 18 and a second pressure gauge 132 are provided on the oil inlet of the accumulator 19, the pressure relay 18 is connected to the oil inlet of the relief valve 17, and the oil outlet of the relief valve 17 is connected to the T port in the accumulator unit B; The oil outlet of the one-way valve 14 is connected to the P port of the first proportional servo valve 201, the A port of the first proportional servo valve 201 is connected to the oil inlet of the oil cylinder and the control valve group integrated unit E, the oil outlet of the oil cylinder and the control valve group integrated unit E is connected to the B port of the first proportional servo valve 201, and the T port of the first proportional servo valve 201 is connected to the oil return port of the oil tank 2 after passing through the oil return filter 23; The oil outlet of the one-way valve 14 is connected to the P port of the second proportional servo valve 202, the A port of the second proportional servo valve 202 is connected to the oil inlet of the oil cylinder and the control valve group integrated unit E, the oil outlet of the oil cylinder and the control valve group integrated unit E is connected to the B port of the second proportional servo valve 202, the T port of the second proportional servo valve 202 is connected to the oil return port of the oil tank 2 after passing through the return oil filter 23, the P port of the second proportional servo valve 202 is connected to the oil inlet of the oil tank 2, and the first stop valve 161 is provided on the oil line between the second proportional servo valve 202 and the oil tank 2; The oil outlet of the one-way valve 14 is communicated with the P port of the manual reversing valve 21, the A port of the manual reversing valve 21 is communicated with the oil inlet of the oil cylinder and the control valve group integrated unit E, the oil outlet of the oil cylinder and the control valve group integrated unit E is communicated with the B port of the manual reversing valve 21, and the T port of the manual reversing valve 21 is communicated with the oil return port of the oil tank 2 after passing through the oil return filter 23; The oil cylinder and control valve group integrated unit E includes a first oil cylinder control valve group and a second oil cylinder control valve group, the first oil cylinder control valve group includes a first oil cylinder 261, the rod chamber of the first oil cylinder 261 is connected to the oil outlet end of the first hydraulically controlled one-way valve 251, the oil outlet end of the first hydraulically controlled one-way valve 251 is connected to the oil return port of the oil tank 2, the oil inlet end of the first hydraulically controlled one-way valve 251 is connected to the oil outlet end of the first one-way throttle valve 231, and the oil inlet end of the first one-way throttle valve 231 is connected to the A port of the manual reversing valve 21; The rodless chamber of the first oil cylinder 261 is connected to the oil outlet end of the second hydraulically controlled one-way valve 252, the oil outlet end of the second hydraulically controlled one-way valve 252 is connected to the oil return port of the oil tank 2, the oil inlet end of the second hydraulically controlled one-way valve 252 is connected to the oil outlet end of the second one-way throttle valve 232, the oil inlet end of the second one-way throttle valve 232 is connected to the B port of the manual reversing valve 21, and a first overflow valve 241 is provided between the second hydraulically controlled one-way valve 252 and the second one-way throttle valve 232; The second oil cylinder control valve group includes a second oil cylinder 262, the rod chamber of the second oil cylinder 262 is connected to the oil outlet end of the third hydraulically controlled one-way valve 253, the oil outlet end of the third hydraulically controlled one-way valve 253 is connected to the oil return port of the oil tank 2, the oil inlet end of the third hydraulically controlled one-way valve 253 is connected to the oil outlet end of the third one-way throttle valve 233, and the oil inlet end of the third one-way throttle valve 233 is connected to the A port of the manual reversing valve 21; The rodless chamber of the second oil cylinder 262 is connected to the oil outlet end of the fourth hydraulically controlled one-way valve 254, the oil outlet end of the fourth hydraulically controlled one-way valve 254 is connected to the oil return port of the oil tank 2, the oil inlet end of the fourth hydraulically controlled one-way valve 254 is connected to the oil outlet end of the fourth one-way throttle valve 234, the oil inlet end of the fourth one-way throttle valve 234 is connected to the B port of the manual reversing valve 21, and a second overflow valve 242 is arranged between the fourth hydraulically controlled one-way valve 254 and the fourth one-way throttle valve 234.

[0031] The oil outlet of the high-pressure filter 11 is connected to the oil inlet of the electromagnetic overflow valve 15, and the oil outlet of the high-pressure filter 11 is connected to the oil inlet of the first pressure gauge 131. A first pressure measuring joint 121 is provided in the oil circuit between the electromagnetic overflow valve 15 and the first pressure gauge 131; The oil outlet end of the electromagnetic overflow valve 15 is communicated with the oil inlet end of the oil tank 2 .

[0032] A second pressure measuring joint 122 is provided in the oil circuit between the one-way valve 14 and the accumulator unit B.

[0033] A third stop valve 163 is provided on the oil path between the accumulator 19 and the P port in the accumulator unit B, and a fourth stop valve 164 is provided on the oil path between the accumulator 19 and the T port in the accumulator unit B.

[0034] A third pressure measuring joint 123 is provided on the oil circuit between the one-way valve 14 and the P port of the first proportional servo valve 201, and a fourth pressure measuring joint 124 is provided on the oil circuit between the T port of the first proportional servo valve 201 and the return oil filter 23; A ninth pressure measuring joint 129 is provided in the oil circuit between the A port of the first proportional servo valve 201 and the cylinder and control valve group integrated unit E, and a tenth pressure measuring joint 1210 is provided in the oil circuit between the B port of the first proportional servo valve 201 and the cylinder and control valve group integrated unit E.

[0035] A seventh pressure measuring joint 127 is provided on the oil path between the one-way valve 14 and the P port of the manual reversing valve 21, and an eighth pressure measuring joint 128 is provided on the oil path between the T port of the manual reversing valve 21 and the oil tank 2; A thirteenth pressure measuring joint 1213 is provided on the oil circuit between the A port of the manual reversing valve 21 and the oil cylinder and the control valve group integrated unit E, and a fourteenth pressure measuring joint 1214 is provided on the oil circuit between the B port of the manual reversing valve 21 and the oil cylinder and the control valve group integrated unit E.

[0036] A fifteenth pressure measuring joint 1215 is provided on the oil inlet line of the first one-way throttle valve 231, and a sixteenth pressure measuring joint 1216 is provided on the oil inlet line of the second one-way throttle valve 232; A nineteenth pressure measuring joint 1219 is provided on the oil outlet line of the first one-way throttle valve 231 , and a twentieth pressure measuring joint 1220 is provided on the oil outlet line of the second one-way throttle valve 232 .

[0037] The oil inlet line of the third one-way throttle valve 233 is provided with a seventeenth pressure measuring joint 1217, and the oil inlet line of the fourth one-way throttle valve 234 is provided with an eighteenth pressure measuring joint 1218; A twenty-first pressure measuring joint 1221 is provided on the oil outlet line of the third one-way throttle valve 233 , and a twenty-second pressure measuring joint 1222 is provided on the oil outlet line of the fourth one-way throttle valve 234 .

[0038] A fifth stop valve 221 is provided between the first one-way throttle valve 231 and the port A of the manual reversing valve 21, and a seventh stop valve 223 is provided between the third one-way throttle valve 233 and the port A of the manual reversing valve 21; A sixth stop valve 222 is provided between the first one-way throttle valve 231 and the port B of the manual reversing valve 21 , and an eighth stop valve 224 is provided between the third one-way throttle valve 233 and the port B of the manual reversing valve 21 .

[0039] The oil tank 2 is provided with a liquid level gauge 3 , an air filter 5 , and an oil filling ball valve 6 in sequence. The air filter 5 is provided with a ninth stop valve 41 and a tenth stop valve 42 .

[0040] The supplementary description of the present invention is as follows: The present invention adopts the accumulator unit B+manual reversing valve 21+one-way throttle valve to realize emergency synchronous driving when there is no electrical signal.

[0041] Embodiment 1: A large flow synchronous drive hydraulic system, the large flow synchronous drive hydraulic system comprises a tank pump unit A, an accumulator unit B, a proportional valve group control unit C, a manual valve group control unit D and a cylinder and control valve group integrated unit E, the tank pump unit A comprises a tank 2, a ball valve 7, a high pressure filter 11, a check valve 14 and a return oil filter 23, the accumulator unit B comprises a relief valve 17, a pressure relay 18 and an accumulator 19, the proportional valve group control unit C comprises a first proportional servo valve 201, a second proportional servo valve 202, and the manual valve group control unit D comprises a manual reversing valve 21; an oil drain ball valve 1 is arranged on the tank 2, the oil outlet end of the tank 2 is connected to the oil inlet end of the ball valve 7, and the oil outlet of the ball valve 7 is connected to the oil outlet of the ball valve 7. The end of the metering pump 10 is connected to the oil inlet end of the metering pump 10, a flexible connector 8 is provided on the oil circuit between the ball valve 7 and the metering pump 10, the metering pump 10 is electrically connected to the motor 9, the oil outlet end of the metering pump 10 is connected to the oil inlet end of the high-pressure filter 11, the oil outlet end of the high-pressure filter 11 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 accumulator 19 in the accumulator unit B through the pressure oil outlet, and a second stop valve 162 is provided between the one-way valve 14 and the oil circuit of the P port in the accumulator unit B; the oil outlet end of the accumulator 19 is connected to the oil inlet end of the third stop valve 163, a third pressure gauge 133 is provided on the oil circuit between the accumulator 19 and the third stop valve 163, and a pressure gauge 133 is provided on the oil inlet oil circuit of the accumulator 19 Relay 18, second pressure gauge 132, pressure relay 18 is connected to the oil inlet end of relief valve 17, and the oil outlet end of relief valve 17 is connected to T port in accumulator unit B; the oil outlet end of the one-way valve 14 is connected to P port of the first proportional servo valve 201, and the A port of the first proportional servo valve 201 is connected to the oil inlet end of the cylinder and control valve group integrated unit E, and the oil outlet end of the cylinder and control valve group integrated unit E is connected to B port of the first proportional servo valve 201, and the T port of the first proportional servo valve 201 is connected to the oil return port of the oil tank 2 after passing through the return oil filter 23; the oil outlet end of the one-way valve 14 is connected to P port of the second proportional servo valve 202, and the A port of the second proportional servo valve 202 is connected to the oil inlet end of the cylinder and control valve group integrated unit E. The oil end is connected, the oil outlet end of the cylinder and the control valve group integrated unit E is connected to the B port of the second proportional servo valve 202, the T port of the second proportional servo valve 202 is connected to the oil return port of the oil tank 2 after passing through the return oil filter 23, the P port of the second proportional servo valve 202 is connected to the oil inlet end of the oil tank 2, and a first stop valve 161 is arranged on the oil circuit between the second proportional servo valve 202 and the oil tank 2; the oil outlet end of the one-way valve 14 is connected to the P port of the manual reversing valve 21, the A port of the manual reversing valve 21 is connected to the oil inlet end of the cylinder and the control valve group integrated unit E, the oil outlet end of the cylinder and the control valve group integrated unit E is connected to the B port of the manual reversing valve 21, and the T port of the manual reversing valve 21 is connected to the oil return port of the oil tank 2 after passing through the return oil filter 23;The cylinder and control valve group integrated unit E includes a first cylinder control valve group and a second cylinder control valve group. The first cylinder control valve group includes a first cylinder 261. The rod chamber of the first cylinder 261 is connected to the oil outlet end of the first hydraulically controlled one-way valve 251. The oil outlet end of the first hydraulically controlled one-way valve 251 is connected to the oil return port of the oil tank 2. The oil inlet end of the first hydraulically controlled one-way valve 251 is connected to the oil outlet end of the first one-way throttle valve 231. The oil end is connected to the A port of the manual reversing valve 21; the rodless chamber of the first oil cylinder 261 is connected to the oil outlet end of the second hydraulically controlled one-way valve 252, the oil outlet end of the second hydraulically controlled one-way valve 252 is connected to the oil return port of the oil tank 2, the oil inlet end of the second hydraulically controlled one-way valve 252 is connected to the oil outlet end of the second one-way throttle valve 232, the oil inlet end of the second one-way throttle valve 232 is connected to the B port of the manual reversing valve 21, the second hydraulically controlled one-way valve 252 is connected to the second one-way throttle valve 232 is provided with a first overflow valve 241; the second oil cylinder control valve group includes a second oil cylinder 262, the rod chamber of the second oil cylinder 262 is connected to the oil outlet end of the third hydraulically controlled one-way valve 253, the oil outlet end of the third hydraulically controlled one-way valve 253 is connected to the oil return port of the oil tank 2, the oil inlet end of the third hydraulically controlled one-way valve 253 is connected to the oil outlet end of the third one-way throttle valve 233, and the oil inlet end of the third one-way throttle valve 233 is connected to the A port of the manual reversing valve 21; The rodless chamber of the second oil cylinder 262 is connected to the oil outlet of the fourth hydraulically controlled one-way valve 254, the oil outlet of the fourth hydraulically controlled one-way valve 254 is connected to the oil return port of the oil tank 2, the oil inlet of the fourth hydraulically controlled one-way valve 254 is connected to the oil outlet of the fourth one-way throttle valve 234, the oil inlet of the fourth one-way throttle valve 234 is connected to the B port of the manual reversing valve 21, and a second overflow valve 242 is provided between the fourth hydraulically controlled one-way valve 254 and the fourth one-way throttle valve 234. ;

[0042] In application: when the pressure of the accumulator 19 is lower than the set value, the pressure relay 18 transmits the command to the control system, and the control system controls the pump group to start outputting the pressure oil to be replenished into the accumulator 19 through the third stop valve 163, so as to replenish the pressure oil into the accumulator 19; when the pressure replenished into the accumulator 19 is higher than the set value, the pressure relay 18 transmits the command to the control system, and the control system controls the pump group to stop pumping and stop replenishing the pressure oil into the accumulator 19, and at this time, the accumulator 19 maintains the pressure and stands by; When the accumulator unit B is in the standby state after being pressurized, if the subsequent working condition action is cancelled due to other reasons, the normally closed fourth stop valve 164 below the accumulator 19 can be opened at this time, and the pressure oil inside the accumulator 19 can be directly returned to the oil tank 2 through the return oil pipeline to prevent safety accidents caused by the accumulator 19 carrying high pressure for a long time; The hydraulic oil is output from the accumulator 19, and the pressure oil is manually operated by the manual reversing valve 21, and then flows into the rodless chamber of the cylinder through the first one-way throttle valve 231 and the first hydraulically controlled one-way valve 251. The pressure oil pushes the cylinder to extend into place. The first one-way throttle valve 231, the second one-way throttle valve 232, the third one-way throttle valve 233, and the fourth one-way throttle valve 234 are return oil speed regulating valves. The movement speed of the cylinder can be controlled by adjusting the opening of the one-way throttle valve on the return oil line; the first hydraulically controlled one-way valve 251 and the second hydraulically controlled one-way valve 252 are used to lock the cylinder by maintaining the liquid pressure in the cylinder when the cylinder is extended or retracted into place, and are not affected by other external factors, so as to play a role of safety protection; the first overflow valve 241 and the second overflow valve 242 are safety protection valves for the cylinder. They are mainly used to release the pressure of the pressure oil back to the oil tank 2 through the overflow valve when the piston rod causes the pressure in the rod chamber to rise sharply due to the instantaneous external force, so as to prevent the cylinder from exploding.

[0043] Embodiment 2: Embodiment 2 is substantially the same as Embodiment 1, except that: The oil outlet of the high-pressure filter 11 is connected to the oil inlet of the electromagnetic overflow valve 15, and the oil outlet of the high-pressure filter 11 is connected to the oil inlet of the first pressure gauge 131. A first pressure measuring joint 121 is provided in the oil circuit between the electromagnetic overflow valve 15 and the first pressure gauge 131; the oil outlet of the electromagnetic overflow valve 15 is connected to the oil inlet of the oil tank 2; a second pressure measuring joint 122 is provided in the oil circuit between the one-way valve 14 and the accumulator unit B, and a third pressure measuring joint 122 is provided in the oil circuit between the one-way valve 14 and the P port of the first proportional servo valve 201. 23, a fourth pressure measuring joint 124 is provided in the oil circuit between the T port of the first proportional servo valve 201 and the return oil filter 23; a ninth pressure measuring joint 129 is provided in the oil circuit between the A port of the first proportional servo valve 201 and the oil cylinder and the control valve group integrated unit E, and a tenth pressure measuring joint 1210 is provided in the oil circuit between the B port of the first proportional servo valve 201 and the oil cylinder and the control valve group integrated unit E; a seventh pressure measuring joint 127 is provided in the oil circuit between the one-way valve 14 and the P port of the manual reversing valve 21, and the T port of the manual reversing valve 21 and the An eighth pressure measuring joint 128 is provided on the oil circuit of the oil tank 2; a thirteenth pressure measuring joint 1213 is provided on the oil circuit between the A port of the manual reversing valve 21 and the oil circuit between the oil cylinder and the control valve group integrated unit E, and a fourteenth pressure measuring joint 1214 is provided on the oil circuit between the B port of the manual reversing valve 21 and the oil circuit between the oil cylinder and the control valve group integrated unit E; a fifteenth pressure measuring joint 1215 is provided on the oil inlet circuit of the first one-way throttle valve 231, and a sixteenth pressure measuring joint 1216 is provided on the oil inlet circuit of the second one-way throttle valve 232; the first one-way throttle valve 231 A nineteenth pressure measuring joint 1219 is provided on the oil outlet line of the second one-way throttle valve 232, and a twentieth pressure measuring joint 1220 is provided on the oil outlet line of the second one-way throttle valve 232; a seventeenth pressure measuring joint 1217 is provided on the oil inlet line of the third one-way throttle valve 233, and an eighteenth pressure measuring joint 1218 is provided on the oil inlet line of the fourth one-way throttle valve 234; a twenty-first pressure measuring joint 1221 is provided on the oil outlet line of the third one-way throttle valve 233, and a twenty-second pressure measuring joint 1222 is provided on the oil outlet line of the fourth one-way throttle valve 234.

[0044] When used: multiple pressure measuring joints are used to detect changes in flow in the system in real time, and adjustments can be made in a timely manner based on changes in pressure in each oil circuit in the system.

[0045] Embodiment 3: Embodiment 3 is substantially the same as Embodiment 1, except that: A fifth stop valve 221 is provided between the first one-way throttle valve 231 and the A port of the manual reversing valve 21, and a seventh stop valve 223 is provided between the third one-way throttle valve 233 and the A port of the manual reversing valve 21; a sixth stop valve 222 is provided between the first one-way throttle valve 231 and the B port of the manual reversing valve 21, and an eighth stop valve 224 is provided between the third one-way throttle valve 233 and the B port of the manual reversing valve 21.

[0046] When in use: the integrated unit E of the oil cylinder and control valve group is a backup unit. When the whole system loses power, if the driving mechanism still needs to execute an action, the accumulator 19 + manual reversing valve group 21 manual rocker can be moved to the left or right position + the integrated unit of the oil cylinder and control valve group, the first one-way throttle valve 231, the second one-way throttle valve 232, the third one-way throttle valve 233, and the fourth one-way throttle valve 234 can be used. During debugging, the opening of the throttle valve is adjusted and locked to meet the synchronization requirements of the two groups of oil cylinders, so that the oil cylinders can be extended or retracted synchronously in an emergency and driven; the electronic control system receives the displacement values ​​of the two hydraulic cylinders, compares the signals through the PID module, and accurately controls the opening of the two proportional valve cores in a closed loop to control the flow rate, so as to ensure that the two oil cylinders are extended or retracted synchronously within the required accuracy range.

[0047] Embodiment 4: Embodiment 4 is substantially the same as Embodiment 1, except that: The oil tank 2 is provided with an oil drain ball valve 1, the oil outlet end of the oil tank 2 is connected to the oil inlet end of the ball valve 7, the oil outlet end of the ball valve 7 is connected to the oil inlet end of the metering pump 10, a flexible connector 8 is provided on the oil circuit between the ball valve 7 and the metering pump 10, the metering pump 10 is electrically connected to the motor 9, the oil outlet end of the metering pump 10 is connected to the oil inlet end of the high-pressure filter 11, the oil outlet end of the high-pressure filter 11 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 accumulator 19 in the accumulator unit B via the pressure oil outlet, a liquid level gauge 3, an air filter 5, and an oil filling ball valve 6 are sequentially provided in the oil tank 2, and the air filter 5 is provided with a ninth stop valve 41 and a tenth stop valve 42.

[0048] When in use: the drain ball valve 1 is used for oil sampling and draining waste oil from the oil tank 2, and the liquid level meter 3 is used to monitor the state of the hydraulic oil in the oil tank; the ninth stop valve 41 and the tenth stop valve 42 are used to close when overhauling and replacing the liquid level meter to prevent the oil in the oil tank from flowing out; the oil filling ball valve 6 is used to connect with the external oil replenishing device to replenish the oil in the oil tank 2; the electromagnetic overflow valve 15 is a system safety valve used to set and protect the system pressure; the motor 9 starts to drive the quantitative pump 10 to suck the hydraulic oil in the oil tank through the stop valve 7 (closed when overhauling the pump to prevent the oil in the mailbox from flowing out) and the flexible connector 8 (to prevent the motor vibration from causing the pipeline to loosen), and the pressure oil generated by the pump outlet P1 is sent into the hydraulic system through the high-pressure filter 11 (filtering impurities in the oil and cleaning the oil) and the one-way valve 14 (preventing the pressure oil from flowing back and damaging the quantitative pump); the total return oil T is used to receive the hydraulic oil of the return oil circuit of the actuator and flows back to the oil tank 2 through the return oil filter (filtering impurities in the oil again and cleaning the oil).

[0049] 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 large flow synchronous drive hydraulic system, characterized by: The large flow synchronous drive hydraulic system comprises an oil tank pump unit (A), an accumulator unit (B), a proportional valve group control unit (C), a manual valve group control unit (D) and an oil cylinder and control valve group integrated unit (E); the oil tank pump unit (A) comprises an oil tank (2), a ball valve (7), a high pressure filter (11), a check valve (14) and an oil return filter (23); the accumulator unit (B) comprises a relief valve (17), a pressure relay (18) and an accumulator (19); the proportional valve group control unit (C) comprises a first proportional servo valve (201) and a second proportional servo valve (202); and the manual valve group control unit (D) comprises a manual reversing valve (21); The oil tank (2) is provided with an oil drain ball valve (1), the oil outlet end of the oil tank (2) is connected to the oil inlet end of the ball valve (7), the oil outlet end of the ball valve (7) is connected to the oil inlet end of the metering pump (10), a flexible connector (8) is provided on the oil circuit between the ball valve (7) and the metering pump (10), the metering pump (10) is electrically connected to the motor (9), the oil outlet end of the metering pump (10) is connected to the oil inlet end of the high-pressure filter (11), the oil outlet end of the high-pressure filter (11) 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 accumulator (19) in the accumulator unit (B) via the pressure oil outlet, and a second stop valve (162) is provided between the one-way valve (14) and the oil circuit of the P port in the accumulator unit (B); The oil outlet end of the accumulator (19) is connected to the oil inlet end of the third stop valve (163); a third pressure gauge (133) is provided on the oil circuit between the accumulator (19) and the third stop valve (163); a pressure relay (18) and a second pressure gauge (132) are provided on the oil inlet circuit of the accumulator (19); the pressure relay (18) is connected to the oil inlet end of the relief valve (17); and the oil outlet end of the relief valve (17) is connected to the T port in the accumulator unit (B); The oil outlet end of the one-way valve (14) is connected to the P port of the first proportional servo valve (201), the A port of the first proportional servo valve (201) is connected to the oil inlet end of the oil cylinder and control valve group integrated unit (E), the oil outlet end of the oil cylinder and control valve group integrated unit (E) is connected to the B port of the first proportional servo valve (201), and the T port of the first proportional servo valve (201) is connected to the oil return port of the oil tank (2) after passing through the oil return filter (23); The oil outlet of the one-way valve (14) is connected to the P port of the second proportional servo valve (202), the A port of the second proportional servo valve (202) is connected to the oil inlet of the oil cylinder and control valve group integrated unit (E), the oil outlet of the oil cylinder and control valve group integrated unit (E) is connected to the B port of the second proportional servo valve (202), the T port of the second proportional servo valve (202) is connected to the oil return port of the oil tank (2) after passing through the oil return filter (23), the P port of the second proportional servo valve (202) is connected to the oil inlet of the oil tank (2), and a first stop valve (161) is provided on the oil path between the second proportional servo valve (202) and the oil tank (2); The oil outlet of the one-way valve (14) is connected to the P port of the manual reversing valve (21), the A port of the manual reversing valve (21) is connected to the oil inlet of the oil cylinder and control valve group integrated unit (E), the oil outlet of the oil cylinder and control valve group integrated unit (E) is connected to the B port of the manual reversing valve (21), and the T port of the manual reversing valve (21) is connected to the oil return port of the oil tank (2) after passing through the oil return filter (23); The oil cylinder and control valve group integrated unit (E) comprises a first oil cylinder control valve group and a second oil cylinder control valve group, the first oil cylinder control valve group comprises a first oil cylinder (261), the rod chamber of the first oil cylinder (261) is connected to the oil outlet end of the first hydraulically controlled one-way valve (251), the oil outlet end of the first hydraulically controlled one-way valve (251) is connected to the oil return port of the oil tank (2), the oil inlet end of the first hydraulically controlled one-way valve (251) is connected to the oil outlet end of the first one-way throttle valve (231), and the oil inlet end of the first one-way throttle valve (231) is connected to the A port of the manual reversing valve (21); The rodless chamber of the first oil cylinder (261) is connected to the oil outlet end of the second hydraulically controlled one-way valve (252), the oil outlet end of the second hydraulically controlled one-way valve (252) is connected to the oil return port of the oil tank (2), the oil inlet end of the second hydraulically controlled one-way valve (252) is connected to the oil outlet end of the second one-way throttle valve (232), the oil inlet end of the second one-way throttle valve (232) is connected to the B port of the manual reversing valve (21), and a first overflow valve (241) is provided between the second hydraulically controlled one-way valve (252) and the second one-way throttle valve (232); The second oil cylinder control valve group comprises a second oil cylinder (262), the rod chamber of the second oil cylinder (262) is connected to the oil outlet end of the third hydraulically controlled one-way valve (253), the oil outlet end of the third hydraulically controlled one-way valve (253) is connected to the oil return port of the oil tank (2), the oil inlet end of the third hydraulically controlled one-way valve (253) is connected to the oil outlet end of the third one-way throttle valve (233), and the oil inlet end of the third one-way throttle valve (233) is connected to the A port of the manual reversing valve (21); The rodless chamber of the second oil cylinder (262) is connected to the oil outlet end of the fourth hydraulically controlled one-way valve (254), the oil outlet end of the fourth hydraulically controlled one-way valve (254) is connected to the oil return port of the oil tank (2), the oil inlet end of the fourth hydraulically controlled one-way valve (254) is connected to the oil outlet end of the fourth one-way throttle valve (234), the oil inlet end of the fourth one-way throttle valve (234) is connected to the B port of the manual reversing valve (21), and a second overflow valve (242) is provided between the fourth hydraulically controlled one-way valve (254) and the fourth one-way throttle valve (234).

2. A large flow synchronous drive hydraulic system according to claim 1, characterized in that: The oil outlet end of the high-pressure filter (11) is in communication with the oil inlet end of the electromagnetic overflow valve (15), the oil outlet end of the high-pressure filter (11) is in communication with the oil inlet end of the first pressure gauge (131), and a first pressure measuring joint (121) is provided in the oil circuit between the electromagnetic overflow valve (15) and the first pressure gauge (131); The oil outlet end of the electromagnetic overflow valve (15) is in communication with the oil inlet end of the oil tank (2).

3. A large flow synchronous drive hydraulic system according to claim 2, characterized in that: A second pressure measuring joint (122) is provided in the oil circuit between the one-way valve (14) and the accumulator unit (B).

4. A large flow synchronous drive hydraulic system according to claim 1, characterized in that: A third stop valve (163) is provided on the oil circuit between the accumulator (19) and the P port in the accumulator unit (B), and a fourth stop valve (164) is provided on the oil circuit between the accumulator (19) and the T port in the accumulator unit (B).

5. A large flow synchronous drive hydraulic system according to claim 4, characterized in that: A third pressure measuring joint (123) is provided on the oil circuit between the one-way valve (14) and the P port of the first proportional servo valve (201), and a fourth pressure measuring joint (124) is provided on the oil circuit between the T port of the first proportional servo valve (201) and the return oil filter (23); A ninth pressure measuring joint (129) is provided in the oil circuit between the A port of the first proportional servo valve (201) and the oil cylinder and control valve group integrated unit (E), and a tenth pressure measuring joint (1210) is provided in the oil circuit between the B port of the first proportional servo valve (201) and the oil cylinder and control valve group integrated unit (E).

6. A large flow synchronous drive hydraulic system according to claim 5, characterized in that: A seventh pressure measuring joint (127) is provided on the oil circuit between the one-way valve (14) and the P port of the manual reversing valve (21), and an eighth pressure measuring joint (128) is provided on the oil circuit between the T port of the manual reversing valve (21) and the oil tank (2); A thirteenth pressure measuring joint (1213) is provided between the A port of the manual reversing valve (21) and the oil circuit of the oil cylinder and the control valve group integrated unit (E), and a fourteenth pressure measuring joint (1214) is provided between the B port of the manual reversing valve (21) and the oil circuit of the oil cylinder and the control valve group integrated unit (E).

7. A large flow synchronous drive hydraulic system according to claim 1, characterized in that: A fifteenth pressure measuring joint (1215) is provided on the oil inlet line of the first one-way throttle valve (231), and a sixteenth pressure measuring joint (1216) is provided on the oil inlet line of the second one-way throttle valve (232); A nineteenth pressure measuring joint (1219) is provided on the oil outlet line of the first one-way throttle valve (231), and a twentieth pressure measuring joint (1220) is provided on the oil outlet line of the second one-way throttle valve (232).

8. A large flow synchronous drive hydraulic system according to claim 7, characterized in that: A seventeenth pressure measuring joint (1217) is provided on the oil inlet line of the third one-way throttle valve (233), and an eighteenth pressure measuring joint (1218) is provided on the oil inlet line of the fourth one-way throttle valve (234); A twenty-first pressure measuring joint (1221) is provided on the oil outlet line of the third one-way throttle valve (233), and a twenty-second pressure measuring joint (1222) is provided on the oil outlet line of the fourth one-way throttle valve (234).

9. A large flow synchronous drive hydraulic system according to claim 8, characterized in that: A fifth stop valve (221) is provided between the first one-way throttle valve (231) and the port A of the manual reversing valve (21), and a seventh stop valve (223) is provided between the third one-way throttle valve (233) and the port A of the manual reversing valve (21); A sixth stop valve (222) is provided between the first one-way throttle valve (231) and the B port of the manual reversing valve (21), and an eighth stop valve (224) is provided between the third one-way throttle valve (233) and the B port of the manual reversing valve (21).

10. A large flow synchronous drive hydraulic system according to any one of claims 1 to 9, characterized in that: The oil tank (2) is provided with a liquid level gauge (3), an air filter (5), and an oil filling ball valve (6) in sequence, and the air filter (5) is provided with a ninth stop valve (41) and a tenth stop valve (42).

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