Cylinder control hydraulic system and control method thereof

Abstract

A hydraulic cylinder-controlled hydraulic system, wherein the oil inlet of the pump group is connected to the oil tank, the oil outlet thereof is connected to the P port of the No. 1 electromagnetic reversing valve, the A port of the No. 1 electromagnetic reversing valve is connected to the A port of the two-way cartridge valve, the B port thereof is connected to the X port of the hydraulically controlled oil return check valve, the A cavity of the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder, the B port of the two-way cartridge valve is connected to the A port of the hydraulically controlled oil return check valve, the B cavity of the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder, the A port of the No. 2 electromagnetic reversing valve, the oil inlet of the No. 2 relief valve, and the X port of the two-way cartridge valve, the P port thereof is connected to the oil inlet of the No. 1 relief valve, the T port of the No. 1 electromagnetic reversing valve, the oil outlet of the No. 1 relief valve, the oil outlet of the No. 2 relief valve, the B port of the No. 2 electromagnetic reversing valve, and the B port of the hydraulically controlled oil return check valve are connected to the oil tank. This system can drive the spring clutch to a predetermined position and then perform a secondary movement, thus avoiding the huge noise and vibration caused by directly entering the full clutch state.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic control systems, and in particular relates to an oil cylinder controlled hydraulic system and a control method thereof. Background Art

[0002] In the marine industry, different hydraulic cylinder control systems have been proposed based on their functionality. Flexible load systems on ships, such as spring clutches, must first enter a semi-clutch state and then a fully clutched state. Directly entering a fully clutched state generates significant noise and vibration during braking. Therefore, there is an urgent need for a hydraulic cylinder control system and control method that can apply secondary pressurization after the hydraulic cylinder reaches a predetermined position, driving the flexible load for a secondary movement and avoiding the significant noise and vibration generated by spring clutches. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a cylinder control hydraulic system and a control method thereof which can perform secondary pressurization after the hydraulic cylinder reaches a predetermined position.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A hydraulic cylinder control system includes a pump group and a No. 1 electromagnetic reversing valve, wherein the oil inlet of the pump group is connected to the oil tank, and the oil outlet of the pump group is connected to the P port of the No. 1 electromagnetic reversing valve;

[0006] The hydraulic system also includes a two-way cartridge valve, a No. 2 solenoid reversing valve, a No. 1 relief valve, a No. 2 relief valve, and a hydraulically controlled oil return check valve. The A port of the No. 1 solenoid reversing valve is connected to the A port of the two-way cartridge valve, the B port of the No. 1 solenoid reversing valve is connected to the X port of the hydraulically controlled oil return check valve, the A cavity of the No. 1 hydraulic cylinder, and the A cavity of the No. 2 hydraulic cylinder. The T port of the No. 1 solenoid reversing valve is connected to the oil tank, the B port of the two-way cartridge valve is connected to the A port of the hydraulically controlled oil return check valve, the No. 1 hydraulic cylinder, and the No. 2 hydraulic cylinder. The B chamber of the hydraulic cylinder, the B chamber of the No. 2 hydraulic cylinder, the A port of the No. 2 solenoid reversing valve, the oil inlet of the No. 2 relief valve, and the X port of the two-way cartridge valve are connected. The P port of the No. 2 solenoid reversing valve is connected to the oil inlet of the No. 1 relief valve. The oil outlet of the No. 1 relief valve, the oil outlet of the No. 2 relief valve, the B port of the No. 2 solenoid reversing valve, and the B port of the hydraulically controlled oil return check valve are all connected to the oil tank. The set pressure value of the No. 2 relief valve is greater than the set pressure value of the No. 1 relief valve.

[0007] The hydraulic system also includes a pressure-maintaining valve, the oil inlet of the pressure-maintaining valve is connected to the A port of the No. 1 electromagnetic reversing valve and the A port of the two-way cartridge valve, the oil outlet of the pressure-maintaining valve is connected to the B port of the two-way cartridge valve, the X port of the two-way cartridge valve, the A port of the No. 2 electromagnetic reversing valve, the oil inlet of the No. 2 relief valve, the B chamber of the No. 1 hydraulic cylinder, the B chamber of the No. 2 hydraulic cylinder, and the A port of the hydraulically controlled oil return check valve. The set pressure value of the pressure-maintaining valve is greater than the set pressure value of the No. 2 relief valve.

[0008] The hydraulic system also includes a No. 1 position switch and a No. 2 position switch. The No. 1 position switch is used to detect whether the piston rods of the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder are displaced to the first position, and the No. 2 position switch is used to detect whether the piston rods of the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder are displaced to the second position.

[0009] The hydraulic system also includes a No. 2 one-way valve, the oil inlet of the No. 2 one-way valve is connected to the A port of the No. 1 electromagnetic reversing valve and the oil inlet of the pressure maintaining valve, and the oil outlet of the No. 2 one-way valve is connected to the oil inlet of the two-way cartridge valve.

[0010] The hydraulic system also includes a No. 1 one-way throttle valve and a No. 2 one-way throttle valve. The oil inlet of the No. 1 one-way throttle valve is connected to the oil outlet of the pressure maintaining valve, the B port of the two-way cartridge valve, the X port of the two-way cartridge valve, the A port of the No. 2 solenoid reversing valve, the oil inlet of the No. 2 relief valve, and the A port of the hydraulically controlled oil return one-way valve. The oil outlet of the No. 1 one-way throttle valve is connected to the B chamber of the No. 1 hydraulic cylinder and the B chamber of the No. 2 hydraulic cylinder. The oil inlet of the No. 2 one-way throttle valve is connected to the B port of the No. 1 solenoid reversing valve and the X port of the hydraulically controlled oil return one-way valve. The oil outlet of the No. 2 one-way throttle valve is connected to the A chamber of the No. 1 hydraulic cylinder and the A chamber of the No. 2 hydraulic cylinder.

[0011] The hydraulic system also includes a filter, the oil inlet of the filter is connected to the oil outlet of the No. 2 overflow valve, the oil outlet of the No. 1 overflow valve, the B port of the No. 2 solenoid reversing valve, the T port of the No. 1 solenoid reversing valve, and the B port of the hydraulically controlled oil return check valve, and the oil outlet of the filter is connected to the oil tank.

[0012] The hydraulic system also includes a No. 1 one-way valve, the oil inlet of the No. 1 one-way valve is connected to the oil outlet of the pump group, and the oil outlet of the No. 1 one-way valve is connected to the P port of the No. 1 electromagnetic reversing valve.

[0013] A control method for a cylinder-controlled hydraulic system, the control method including pressurization control, the pressurization control sequentially comprising the following steps:

[0014] S1, control the P port of the No. 1 solenoid reversing valve to be connected to the A port, and the B port to be connected to the T port, while controlling the A port of the No. 2 solenoid reversing valve to be connected to the P port. The hydraulic oil output by the pump group passes through the P port of the No. 1 solenoid reversing valve, the A port of the No. 1 solenoid reversing valve, the A port of the two-way cartridge valve, and the B port of the two-way cartridge valve in sequence and is divided into two paths. One path of hydraulic oil passes through the A port of the No. 2 solenoid reversing valve, the P port of the No. 2 solenoid reversing valve, and the No. 1 relief valve in sequence and enters the oil tank. The other path of hydraulic oil enters the B cavity of the No. 1 hydraulic cylinder and the B cavity of the No. 2 hydraulic cylinder, pushing the piston rods on the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder to extend. The hydraulic oil in the A cavity of the No. 1 hydraulic cylinder and the A cavity of the No. 2 hydraulic cylinder passes through the B port of the No. 1 solenoid reversing valve and the T port of the No. 1 solenoid reversing valve in sequence and enters the oil tank.

[0015] S2. After it is detected that the piston rods on the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder are extended to the first position, so that the spring clutch connected to the piston rod enters the semi-clutch state, the B port of the No. 2 electromagnetic reversing valve is controlled to be connected to the P port, and the hydraulic oil output by the pump group passes through the P port of the No. 1 electromagnetic reversing valve, the A port of the No. 1 electromagnetic reversing valve, the A port of the two-way cartridge valve, and the B port of the two-way cartridge valve in sequence and is divided into two paths. One path of hydraulic oil passes through the No. 2 relief valve and enters the oil tank, and the other path of hydraulic oil enters the B chamber of the No. 1 hydraulic cylinder and the B chamber of the No. 2 hydraulic cylinder, and continues to push the piston rods on the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder to extend to the second position, so that the spring clutch connected to the piston rod enters the full-clutch state. The hydraulic oil in the A chamber of the No. 1 hydraulic cylinder and the A chamber of the No. 2 hydraulic cylinder passes through the B port of the No. 1 electromagnetic reversing valve and the T port of the No. 1 electromagnetic reversing valve in sequence and enters the oil tank.

[0016] The hydraulic system also includes a pressure-maintaining valve, the oil inlet of the pressure-maintaining valve is connected to the A port of the No. 1 electromagnetic reversing valve and the A port of the two-way cartridge valve, the oil outlet of the pressure-maintaining valve is connected to the B port of the two-way cartridge valve, the X port of the two-way cartridge valve, the A port of the No. 2 electromagnetic reversing valve, the oil inlet of the No. 2 relief valve, the B chamber of the No. 1 hydraulic cylinder, the B chamber of the No. 2 hydraulic cylinder, and the A port of the hydraulically controlled oil return check valve, and the set pressure value of the pressure-maintaining valve is greater than the set pressure value of the No. 2 relief valve;

[0017] The pressurization control further includes step S3, which is specifically:

[0018] After detecting that the piston rods on the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder are extended to the second position, the No. 1 electromagnetic reversing valve is controlled to lose power, so that the hydraulic system enters the pressure holding mode.

[0019] The control method further includes pressure reduction control, which is specifically:

[0020] Control the P port of the No. 1 solenoid reversing valve to be connected with the B port and the A port to be connected with the T port. The hydraulic oil output by the pump group passes through the P port of the No. 1 solenoid reversing valve and the B port of the No. 1 solenoid reversing valve in turn and is divided into two paths. One path of hydraulic oil enters the X port of the hydraulically controlled oil return check valve, so that the A port of the hydraulically controlled oil return check valve is connected with the B port. The other path of hydraulic oil enters the A cavity of the No. 1 hydraulic cylinder and the A cavity of the No. 2 hydraulic cylinder, pushing the piston rods on the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder to retract. The hydraulic oil in the B cavity of the No. 1 hydraulic cylinder and the B cavity of the No. 2 hydraulic cylinder enters the oil tank after passing through the hydraulically controlled oil return check valve.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention relates to a hydraulic cylinder control system comprising a pump group, a No. 1 electromagnetic reversing valve, a two-way cartridge valve, a No. 2 electromagnetic reversing valve, a No. 1 relief valve, a No. 2 relief valve, and a hydraulically controlled oil return check valve. The oil inlet of the pump group is connected to the oil tank, the oil outlet of the pump group is connected to the P port of the No. 1 electromagnetic reversing valve, the A port of the No. 1 electromagnetic reversing valve is connected to the A port of the two-way cartridge valve, the B port of the No. 1 electromagnetic reversing valve is connected to the X port of the hydraulically controlled oil return check valve, and the No. 2 electromagnetic reversing valve is connected to the X port of the hydraulically controlled oil return check valve. The A chamber of the No. 1 hydraulic cylinder and the A chamber of the No. 2 hydraulic cylinder are connected, the T port of the No. 1 electromagnetic reversing valve is connected to the oil tank, the B port of the two-way cartridge valve is connected to the A port of the hydraulic return oil check valve, the B chamber of the No. 1 hydraulic cylinder, the B chamber of the No. 2 hydraulic cylinder, the A port of the No. 2 electromagnetic reversing valve, the oil inlet of the No. 2 relief valve, and the X port of the two-way cartridge valve are connected, the P port of the No. 2 electromagnetic reversing valve is connected to the oil inlet of the No. 1 relief valve, and the outlet of the No. 1 relief valve is connected. The oil port, the oil outlet of the No. 2 relief valve, the B port of the No. 2 solenoid reversing valve, and the B port of the hydraulically controlled oil return check valve are all connected to the oil tank. The working principle of the system is to first control the P port of the No. 1 solenoid reversing valve to be connected to the A port and the B port to be connected to the T port, while controlling the A port of the No. 2 solenoid reversing valve to be connected to the P port, so that the piston rods on the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder are extended. When the piston rod is extended to the first position, the spring clutch connected to the piston rod enters a semi-clutch state, and the B port of the No. 2 solenoid reversing valve is controlled to be connected to the P port. Since the set pressure value of the No. 2 relief valve is greater than the set pressure value of the No. 1 relief valve, the pressure is increased to make the piston rod continue to extend. When the piston rod is extended to the second position, the spring clutch connected to the piston rod enters a full-clutch state, completing the braking, and avoiding the spring clutch directly entering a full-clutch state to cause huge noise and vibration. Therefore, the present invention can apply secondary pressure after the hydraulic cylinder reaches a predetermined position, driving the spring clutch to move a second time, thereby preventing the spring clutch from directly entering a fully clutched state and generating huge noise and vibration.

[0023] 2. The present invention further provides a hydraulic cylinder control system, wherein the oil inlet of the pressure-maintaining valve is connected to port A of the No. 1 electromagnetic reversing valve and port A of the two-way cartridge valve, and the oil outlet of the pressure-maintaining valve is connected to port B of the two-way cartridge valve, port X of the two-way cartridge valve, port A of the No. 2 electromagnetic reversing valve, the oil inlet of the No. 2 relief valve, chamber B of the No. 1 hydraulic cylinder, chamber B of the No. 2 hydraulic cylinder, and port A of the hydraulically controlled oil return check valve. Upon detecting that the piston rods on the No. 1 and No. 2 hydraulic cylinders have extended to the second position, the system controls the No. 1 electromagnetic reversing valve to lose power. Since the set pressure value of the pressure-maintaining valve is greater than the set pressure value of the No. 2 relief valve, the hydraulic system enters a pressure-maintaining mode, thereby making the system more stable. Therefore, the present invention has a pressure-maintaining function and good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram illustrating the principle of the present invention.

[0025] In the figure, there are pump group 1, solenoid reversing valve No. 1 2, two-way cartridge valve 3, solenoid reversing valve No. 2 4, overflow valve No. 1 5, overflow valve No. 2 6, hydraulically controlled oil return check valve 7, pressure maintaining valve 8, position switch No. 1 9, position switch No. 2 10, check valve No. 2 11, one-way throttle valve No. 1 12, one-way throttle valve No. 2 13, filter 14, one-way valve No. 1 15, oil tank 16, hydraulic cylinder No. 1 17, and hydraulic cylinder No. 2 18. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments.

[0027] See also Figure 1 , a hydraulic cylinder control hydraulic system, comprising a pump group 1, a number one electromagnetic reversing valve 2, wherein the oil inlet of the pump group 1 is connected to the oil tank 16, and the oil outlet of the pump group 1 is connected to the P port of the number one electromagnetic reversing valve 2;

[0028] The hydraulic system also includes a two-way cartridge valve 3, a No. 2 solenoid reversing valve 4, a No. 1 relief valve 5, a No. 2 relief valve 6, and a hydraulically controlled oil return check valve 7. The A port of the No. 1 solenoid reversing valve 2 is connected to the A port of the two-way cartridge valve 3, the B port of the No. 1 solenoid reversing valve 2 is connected to the X port of the hydraulically controlled oil return check valve 7, the A cavity of the No. 1 hydraulic cylinder 17, and the A cavity of the No. 2 hydraulic cylinder 18. The T port of the No. 1 solenoid reversing valve 2 is connected to the oil tank 16. The B port of the two-way cartridge valve 3 is connected to the A port of the hydraulically controlled oil return check valve 7, the B chamber of the No. 1 hydraulic cylinder 17, the B chamber of the No. 2 hydraulic cylinder 18, the A port of the No. 2 electromagnetic reversing valve 4, the oil inlet of the No. 2 relief valve 6, and the X port of the two-way cartridge valve 3. The P port of the No. 2 electromagnetic reversing valve 4 is connected to the oil inlet of the No. 1 relief valve 5. The oil outlet of the No. 1 relief valve 5, the oil outlet of the No. 2 relief valve 6, the B port of the No. 2 electromagnetic reversing valve 4, and the B port of the hydraulically controlled oil return check valve 7 are all connected to the oil tank 16. The set pressure value of the No. 2 relief valve 6 is greater than the set pressure value of the No. 1 relief valve 5.

[0029] The hydraulic system also includes a pressure-maintaining valve 8, the oil inlet of the pressure-maintaining valve 8 is connected to the A port of the No. 1 electromagnetic reversing valve 2 and the A port of the two-way cartridge valve 3, and the oil outlet of the pressure-maintaining valve 8 is connected to the B port of the two-way cartridge valve 3, the X port of the two-way cartridge valve 3, the A port of the No. 2 electromagnetic reversing valve 4, the oil inlet of the No. 2 relief valve 6, the B chamber of the No. 1 hydraulic cylinder 17, the B chamber of the No. 2 hydraulic cylinder 18, and the A port of the hydraulically controlled oil return check valve 7. The set pressure value of the pressure-maintaining valve 8 is greater than the set pressure value of the No. 2 relief valve 6.

[0030] The hydraulic system also includes a No. 1 position switch 9 and a No. 2 position switch 10. The No. 1 position switch 9 is used to detect whether the piston rods of the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 are displaced to the first position, and the No. 2 position switch 10 is used to detect whether the piston rods of the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 are displaced to the second position.

[0031] The hydraulic system also includes a No. 2 one-way valve 11, the oil inlet of the No. 2 one-way valve 11 is connected to the A port of the No. 1 electromagnetic reversing valve 2 and the oil inlet of the pressure maintaining valve 8, and the oil outlet of the No. 2 one-way valve 11 is connected to the oil inlet of the two-way cartridge valve 3.

[0032] The hydraulic system also includes a No. 1 one-way throttle valve 12 and a No. 2 one-way throttle valve 13. The oil inlet of the No. 1 one-way throttle valve 12 is connected to the oil outlet of the pressure maintaining valve 8, the B port of the two-way cartridge valve 3, the X port of the two-way cartridge valve 3, the A port of the No. 2 electromagnetic reversing valve 4, the oil inlet of the No. 2 overflow valve 6, and the A port of the hydraulically controlled oil return one-way valve 7. The oil outlet of the No. 1 one-way throttle valve 12 is connected to the B chamber of the No. 1 hydraulic cylinder 17 and the B chamber of the No. 2 hydraulic cylinder 18. The oil inlet of the No. 2 one-way throttle valve 13 is connected to the B port of the No. 1 electromagnetic reversing valve 2 and the X port of the hydraulically controlled oil return one-way valve 7. The oil outlet of the No. 2 one-way throttle valve 13 is connected to the A chamber of the No. 1 hydraulic cylinder 17 and the A chamber of the No. 2 hydraulic cylinder 18.

[0033] The hydraulic system also includes a filter 14, the oil inlet of the filter 14 is connected to the oil outlet of the No. 2 relief valve 6, the oil outlet of the No. 1 relief valve 5, the B port of the No. 2 solenoid reversing valve 4, the T port of the No. 1 solenoid reversing valve 2, and the B port of the hydraulically controlled oil return check valve 7, and the oil outlet of the filter 14 is connected to the oil tank 16.

[0034] The hydraulic system further includes a No. 1 one-way valve 15 , the oil inlet of the No. 1 one-way valve 15 is connected to the oil outlet of the pump group 1 , and the oil outlet of the No. 1 one-way valve 15 is connected to the P port of the No. 1 electromagnetic reversing valve 2 .

[0035] A control method for a cylinder-controlled hydraulic system, the control method including pressurization control, the pressurization control sequentially comprising the following steps:

[0036] S1, control the P port of the No. 1 solenoid reversing valve 2 to be connected to the A port, and the B port to be connected to the T port, while controlling the A port of the No. 2 solenoid reversing valve 4 to be connected to the P port. The hydraulic oil output by the pump group 1 passes through the P port of the No. 1 solenoid reversing valve 2, the A port of the No. 1 solenoid reversing valve 2, the A port of the two-way cartridge valve 3, and the B port of the two-way cartridge valve 3 in sequence and is divided into two paths. One path of hydraulic oil passes through the A port of the No. 2 solenoid reversing valve 4, the P port of the No. 2 solenoid reversing valve 4, and the No. 1 relief valve 5 in sequence and enters the oil tank 16. The other path of hydraulic oil enters the B cavity of the No. 1 hydraulic cylinder 17 and the B cavity of the No. 2 hydraulic cylinder 18, pushing the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 to extend. The hydraulic oil in the A cavity of the No. 1 hydraulic cylinder 17 and the A cavity of the No. 2 hydraulic cylinder 18 passes through the B port of the No. 1 solenoid reversing valve 2 and the T port of the No. 1 solenoid reversing valve 2 in sequence and enters the oil tank 16.

[0037] S2. After it is detected that the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 are extended to the first position, so that the spring clutch connected to the piston rod enters the semi-clutch state, the B port of the No. 2 electromagnetic reversing valve 4 is controlled to be connected with the P port. The hydraulic oil output by the pump group 1 passes through the P port of the No. 1 electromagnetic reversing valve 2, the A port of the No. 1 electromagnetic reversing valve 2, the A port of the two-way cartridge valve 3, and the B port of the two-way cartridge valve 3 in sequence, and is then divided into two paths. One path of hydraulic oil passes through the No. 2 relief valve 6 and enters the oil tank 16, another line of hydraulic oil enters the B chamber of the No. 1 hydraulic cylinder 17 and the B chamber of the No. 2 hydraulic cylinder 18, and continues to push the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 to extend to the second position, so that the spring clutch connected to the piston rod enters the full clutch state, and the hydraulic oil in the A chamber of the No. 1 hydraulic cylinder 17 and the A chamber of the No. 2 hydraulic cylinder 18 passes through the B port of the No. 1 electromagnetic reversing valve 2 and the T port of the No. 1 electromagnetic reversing valve 2 in turn and enters the inside of the oil tank 16.

[0038] The hydraulic system also includes a pressure-maintaining valve 8, the oil inlet of the pressure-maintaining valve 8 is connected to the A port of the No. 1 electromagnetic reversing valve 2 and the A port of the two-way cartridge valve 3, and the oil outlet of the pressure-maintaining valve 8 is connected to the B port of the two-way cartridge valve 3, the X port of the two-way cartridge valve 3, the A port of the No. 2 electromagnetic reversing valve 4, the oil inlet of the No. 2 relief valve 6, the B chamber of the No. 1 hydraulic cylinder 17, the B chamber of the No. 2 hydraulic cylinder 18, and the A port of the hydraulically controlled oil return check valve 7. The set pressure value of the pressure-maintaining valve 8 is greater than the set pressure value of the No. 2 relief valve 6;

[0039] The pressurization control further includes step S3, which is specifically:

[0040] After it is detected that the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 are extended to the second position, the No. 1 electromagnetic reversing valve 2 is controlled to lose power, and the hydraulic system enters the pressure holding mode.

[0041] The control method further includes pressure reduction control, which is specifically:

[0042] Control the P port of the No. 1 electromagnetic reversing valve 2 to be connected with the B port, and the A port to be connected with the T port. The hydraulic oil output by the pump group 1 passes through the P port of the No. 1 electromagnetic reversing valve 2 and the B port of the No. 1 electromagnetic reversing valve 2 in sequence and is divided into two paths. One path of hydraulic oil enters the X port of the hydraulically controlled oil return check valve 7, so that the A port of the hydraulically controlled oil return check valve 7 is connected with the B port. The other path of hydraulic oil enters the A cavity of the No. 1 hydraulic cylinder 17 and the A cavity of the No. 2 hydraulic cylinder 18, pushing the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 to retract. The hydraulic oil in the B cavity of the No. 1 hydraulic cylinder 17 and the B cavity of the No. 2 hydraulic cylinder 18 passes through the hydraulically controlled oil return check valve 7 and enters the inside of the oil tank 16.

[0043] The working principle of the present invention is:

[0044] When the motor in the pump group 1 rotates, the pump inputs high-pressure oil into the hydraulic system through the first check valve 15;

[0045] When the piston rods of the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 need to be moved to the right and extended, the No. 1 electromagnetic reversing valve 2 works in the right position, and the hydraulic oil output by the pump group enters the No. 2 one-way valve 11 through the No. 1 electromagnetic reversing valve 2 in the right position. The A port of the No. 2 electromagnetic reversing valve 4 is connected with the P port. After one path of hydraulic oil enters the pilot oil circuit through the two-way cartridge valve 3, the No. 1 relief valve 5 is opened to keep the rear end pressure of the two-way cartridge valve 3 constant. The other path of hydraulic oil enters the No. 1 one-way throttle valve 12, thereby pushing the piston rods of the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 to move to the right. When the displacement is completed, the No. 1 position switch 9 is triggered;

[0046] When the No. 1 position switch 9 is triggered, the hydraulic system is controlled to enter the secondary pressurization state. At this time, the B port of the No. 2 electromagnetic reversing valve 4 is connected to the P port, and the No. 2 relief valve 6 enters the working state. Since the set pressure value of the No. 2 relief valve 6 is higher than the set pressure value of the No. 1 relief valve 5 and the difference is constant, the piston rods of the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 are pushed to make a small fixed displacement again. When the displacement is completed, the No. 2 position switch 10 is triggered;

[0047] When the No. 2 position switch 10 is triggered, the hydraulic system is controlled to enter the pressure holding mode. At this time, the No. 1 electromagnetic reversing valve 2 loses power. Since the pressure setting value of the pressure holding valve 8 is higher than the pressure setting value of the No. 2 relief valve 6, the hydraulic system enters the pressure holding mode.

[0048] When the piston rods of the No. 1 and No. 2 hydraulic cylinders 17 and 18 need to be retracted to the left, the No. 1 electromagnetic reversing valve 2 is operated in the left position, and the hydraulic oil output by the pump group 1 enters the No. 2 one-way throttle valve 13 through the left position of the No. 1 electromagnetic reversing valve 2, pushing the piston rods of the No. 1 and No. 2 hydraulic cylinders 17 and 18 to move to the left. At this time, the pilot oil output by the No. 1 electromagnetic reversing valve 2 opens the hydraulic return oil check valve 7, and the hydraulic oil flowing out of the left chambers of the No. 1 and No. 2 hydraulic cylinders 17 and 18 passes through the No. 1 one-way throttle valve 12 and the hydraulic return oil check valve 7 in sequence and returns to the interior of the oil tank.

[0049] Example 1:

[0050] See also Figure 1A hydraulic cylinder control system includes a pump group 1, a No. 1 electromagnetic reversing valve 2, a two-way cartridge valve 3, a No. 2 electromagnetic reversing valve 4, a No. 1 relief valve 5, a No. 2 relief valve 6, a hydraulically controlled oil return check valve 7, a pressure maintaining valve 8, a No. 2 check valve 11, a No. 1 one-way throttle valve 12, a No. 2 one-way throttle valve 13, a filter 14, and a No. 1 one-way valve 15. The oil inlet of the pump group 1 is connected to the oil tank 16, and the oil outlet of the pump group 1 is connected to the oil inlet of the No. 1 one-way valve 15. The oil outlet of the No. 1 one-way valve 15 is connected to the P port of the No. 1 electromagnetic reversing valve 2. The A port of the No. 1 electromagnetic reversing valve 2 is connected to the A port of the two-way cartridge valve 3 through the No. 2 one-way valve 11. The A port of the No. 1 electromagnetic reversing valve 2 is also connected to the B port of the two-way cartridge valve 3, the X port of the two-way cartridge valve 3, the A port of the No. 2 electromagnetic reversing valve 4, the oil inlet of the No. 2 relief valve 6, the oil inlet of the No. 1 one-way throttle valve 12, and the A port of the hydraulic control oil return check valve 7 through the pressure maintaining valve 8. The B port of the No. 1 electromagnetic reversing valve 2 is connected to the X port of the hydraulic return oil check valve 7 and the oil inlet of the No. 2 one-way throttle valve 13. The P port of the No. 2 electromagnetic reversing valve 4 is connected to the oil inlet of the No. 1 relief valve 5. The oil outlet of the No. 1 one-way throttle valve 12 is connected to the B cavity of the No. 1 hydraulic cylinder 17 and the B cavity of the No. 2 hydraulic cylinder 18. The oil outlet of the No. 2 one-way throttle valve 13 is connected to the A cavity of the No. 1 hydraulic cylinder 17 and the A cavity of the No. 2 hydraulic cylinder 18. The T port of the No. 1 electromagnetic reversing valve 2, the B port of the No. 2 electromagnetic reversing valve 4, the oil outlet of the No. 2 relief valve 6, the oil outlet of the No. 1 relief valve 5, and the B port of the hydraulically controlled oil return check valve 7 are all connected to the oil inlet of the filter 14, and the oil outlet of the filter 14 is connected to the oil tank 16. Among them, the set pressure value of the No. 2 relief valve 6 is greater than the set pressure value of the No. 1 relief valve 5, and the set pressure value of the pressure maintaining valve 8 is greater than the set pressure value of the No. 2 relief valve 6.

[0051] The control method of the above-mentioned cylinder control hydraulic system includes pressurization control and decompression control, and the pressurization control specifically includes the following steps:

[0052] S1, control the P port of the No. 1 solenoid reversing valve 2 to be connected to the A port, and the B port to be connected to the T port, while controlling the A port of the No. 2 solenoid reversing valve 4 to be connected to the P port. The hydraulic oil output by the pump group 1 passes through the P port of the No. 1 solenoid reversing valve 2, the A port of the No. 1 solenoid reversing valve 2, the A port of the two-way cartridge valve 3, and the B port of the two-way cartridge valve 3 in sequence and is divided into two paths. One path of hydraulic oil passes through the A port of the No. 2 solenoid reversing valve 4, the P port of the No. 2 solenoid reversing valve 4, and the No. 1 relief valve 5 in sequence and enters the oil tank 16. The other path of hydraulic oil enters the B cavity of the No. 1 hydraulic cylinder 17 and the B cavity of the No. 2 hydraulic cylinder 18, pushing the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 to extend. The hydraulic oil in the A cavity of the No. 1 hydraulic cylinder 17 and the A cavity of the No. 2 hydraulic cylinder 18 passes through the B port of the No. 1 solenoid reversing valve 2 and the T port of the No. 1 solenoid reversing valve 2 in sequence and enters the oil tank 16.

[0053] S2. After it is detected that the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 are extended to the first position, so that the spring clutch connected to the piston rod enters the semi-clutch state, the B port of the No. 2 electromagnetic reversing valve 4 is controlled to be connected with the P port. The hydraulic oil output by the pump group 1 passes through the P port of the No. 1 electromagnetic reversing valve 2, the A port of the No. 1 electromagnetic reversing valve 2, the A port of the two-way cartridge valve 3, and the B port of the two-way cartridge valve 3 in sequence, and is then divided into two paths. One path of hydraulic oil passes through the No. 2 relief valve 6 and enters the oil tank 16, another line of hydraulic oil enters the B chamber of the No. 1 hydraulic cylinder 17 and the B chamber of the No. 2 hydraulic cylinder 18, and continues to push the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 to extend to the second position, so that the spring clutch connected to the piston rod enters the full clutch state, and the hydraulic oil in the A chamber of the No. 1 hydraulic cylinder 17 and the A chamber of the No. 2 hydraulic cylinder 18 passes through the B port of the No. 1 electromagnetic reversing valve 2 and the T port of the No. 1 electromagnetic reversing valve 2 in turn and enters the inside of the oil tank 16.

[0054] S3, when it is detected that the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 extend to the second position, the No. 1 electromagnetic reversing valve 2 is controlled to lose power, and the hydraulic system enters the pressure holding mode.

[0055] The pressure reducing control is specifically as follows: controlling the P port of the No. 1 electromagnetic reversing valve 2 to be connected with the B port, and the A port to be connected with the T port, and the hydraulic oil output by the pump group 1 passes through the P port of the No. 1 electromagnetic reversing valve 2 and the B port of the No. 1 electromagnetic reversing valve 2 in turn and is divided into two paths, one path of hydraulic oil enters the X port of the hydraulically controlled oil return check valve 7, so that the A port of the hydraulically controlled oil return check valve 7 is connected with the B port, and the other path of hydraulic oil enters the A cavity of the No. 1 hydraulic cylinder 17 and the A cavity of the No. 2 hydraulic cylinder 18, pushing the piston rods on the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 to retract, and the hydraulic oil in the B cavity of the No. 1 hydraulic cylinder 17 and the B cavity of the No. 2 hydraulic cylinder 18 passes through the hydraulically controlled oil return check valve 7 and enters the inside of the oil tank 16.

[0056] Example 2:

[0057] The difference from Example 1 is that:

[0058] The hydraulic system also includes a No. 1 position switch 9 and a No. 2 position switch 10. The No. 1 position switch 9 is used to detect whether the piston rods of the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 are displaced to the first position, and the No. 2 position switch 10 is used to detect whether the piston rods of the No. 1 hydraulic cylinder 17 and the No. 2 hydraulic cylinder 18 are displaced to the second position.

Claims

1. A control method for a cylinder-controlled hydraulic system, the control method being based on the cylinder-controlled hydraulic system, the hydraulic system comprising a pump group (1) and a No. 1 electromagnetic reversing valve (2), the oil inlet of the pump group (1) being connected to an oil tank (16), the oil outlet of the pump group (1) being connected to a P port of the No. 1 electromagnetic reversing valve (2), and characterized in that: The hydraulic system further comprises a two-way cartridge valve (3), a second electromagnetic reversing valve (4), a first overflow valve (5), a second overflow valve (6), and a hydraulically controlled oil return check valve (7). The A port of the first electromagnetic reversing valve (2) is connected to the A port of the two-way cartridge valve (3), the B port of the first electromagnetic reversing valve (2) is connected to the X port of the hydraulically controlled oil return check valve (7), the A cavity of the first hydraulic cylinder (17), and the A cavity of the second hydraulic cylinder (18). The T port of the first electromagnetic reversing valve (2) is connected to the oil tank (16), the B port of the two-way cartridge valve (3) is connected to the A port of the hydraulically controlled oil return check valve (7), the A cavity of the first hydraulic cylinder (17), and the A cavity of the second hydraulic cylinder (18). The B chamber of the No. 1 hydraulic cylinder (17), the B chamber of the No. 2 hydraulic cylinder (18), the A port of the No. 2 electromagnetic reversing valve (4), the oil inlet of the No. 2 relief valve (6), and the X port of the two-way plug-in valve (3) are connected, the P port of the No. 2 electromagnetic reversing valve (4) is connected to the oil inlet of the No. 1 relief valve (5), the oil outlet of the No. 1 relief valve (5), the oil outlet of the No. 2 relief valve (6), the B port of the No. 2 electromagnetic reversing valve (4), and the B port of the hydraulic control oil return check valve (7) are all connected to the oil tank (16), and the set pressure value of the No. 2 relief valve (6) is greater than the set pressure value of the No. 1 relief valve (5); The control method includes pressurization control, which includes the following steps in sequence: S1, controls the connection between the P port of the No. 1 electromagnetic reversing valve (2) and the A port, and the connection between the B port and the T port, and controls the A port of the No. 2 electromagnetic reversing valve (4) and the P port. The hydraulic oil output by the pump group (1) passes through the P port of the No. 1 electromagnetic reversing valve (2), the A port of the No. 1 electromagnetic reversing valve (2), the A port of the two-way cartridge valve (3), and the B port of the two-way cartridge valve (3) in sequence and is then divided into two paths. The hydraulic oil in one path passes through the A port of the No. 2 electromagnetic reversing valve (4), the P port of the No. 2 electromagnetic reversing valve (4) in sequence. , and then enter the oil tank (16) after passing through the No. 1 overflow valve (5), and the other hydraulic oil enters the B chamber of the No. 1 hydraulic cylinder (17) and the B chamber of the No. 2 hydraulic cylinder (18), pushing the piston rods on the No. 1 hydraulic cylinder (17) and the No. 2 hydraulic cylinder (18) to extend. The hydraulic oil in the A chamber of the No. 1 hydraulic cylinder (17) and the A chamber of the No. 2 hydraulic cylinder (18) passes through the B port of the No. 1 electromagnetic reversing valve (2) and the T port of the No. 1 electromagnetic reversing valve (2) in turn and then enters the oil tank (16); S2, after it is detected that the piston rods on the No. 1 hydraulic cylinder (17) and the No. 2 hydraulic cylinder (18) extend to the first position, so that the spring clutch connected to the piston rod enters the semi-clutch state, the B port of the No. 2 electromagnetic reversing valve (4) is controlled to be connected to the P port, and the hydraulic oil output by the pump group (1) passes through the P port of the No. 1 electromagnetic reversing valve (2), the A port of the No. 1 electromagnetic reversing valve (2), the A port of the two-way cartridge valve (3), and the B port of the two-way cartridge valve (3) in sequence and is divided into two paths. One path of hydraulic oil passes through the No. 2 relief valve (6) and enters the oil tank ( 16), another hydraulic oil enters the B chamber of the No. 1 hydraulic cylinder (17) and the B chamber of the No. 2 hydraulic cylinder (18), and continues to push the piston rods on the No. 1 hydraulic cylinder (17) and the No. 2 hydraulic cylinder (18) to extend to the second position, so that the spring clutch connected to the piston rod enters the full clutch state, and the hydraulic oil in the A chamber of the No. 1 hydraulic cylinder (17) and the A chamber of the No. 2 hydraulic cylinder (18) passes through the B port of the No. 1 electromagnetic reversing valve (2) and the T port of the No. 1 electromagnetic reversing valve (2) in turn and enters the interior of the oil tank (16); The hydraulic system further comprises a pressure-maintaining valve (8), the oil inlet of the pressure-maintaining valve (8) being connected to the A port of the No. 1 electromagnetic reversing valve (2) and the A port of the two-way cartridge valve (3), the oil outlet of the pressure-maintaining valve (8) being connected to the B port of the two-way cartridge valve (3), the X port of the two-way cartridge valve (3), the A port of the No. 2 electromagnetic reversing valve (4), the oil inlet of the No. 2 relief valve (6), the B chamber of the No. 1 hydraulic cylinder (17), the B chamber of the No. 2 hydraulic cylinder (18), and the A port of the hydraulically controlled oil return check valve (7), and the set pressure value of the pressure-maintaining valve (8) is greater than the set pressure value of the No. 2 relief valve (6); The pressurization control further includes step S3, which is specifically: When it is detected that the piston rods on the No. 1 hydraulic cylinder (17) and the No. 2 hydraulic cylinder (18) extend to the second position, the No. 1 electromagnetic reversing valve (2) is controlled to lose power, and the hydraulic system enters the pressure holding mode; The control method further includes pressure reduction control, which is specifically: The P port of the No. 1 electromagnetic reversing valve (2) is controlled to be connected to the B port and the A port to be connected to the T port. The hydraulic oil output by the pump group (1) passes through the P port of the No. 1 electromagnetic reversing valve (2) and the B port of the No. 1 electromagnetic reversing valve (2) in sequence and is divided into two paths. One path of hydraulic oil enters the X port of the hydraulic control oil return check valve (7), so that the A port of the hydraulic control oil return check valve (7) is connected to the B port. The other path of hydraulic oil enters the A cavity of the No. 1 hydraulic cylinder (17) and the A cavity of the No. 2 hydraulic cylinder (18), pushing the piston rods on the No. 1 hydraulic cylinder (17) and the No. 2 hydraulic cylinder (18) to retract. The hydraulic oil in the B cavity of the No. 1 hydraulic cylinder (17) and the B cavity of the No. 2 hydraulic cylinder (18) passes through the hydraulic control oil return check valve (7) and enters the inside of the oil tank (16).

2. The control method of a cylinder control hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a No. 1 position switch (9) and a No. 2 position switch (10), wherein the No. 1 position switch (9) is used to detect whether the piston rods of the No. 1 hydraulic cylinder (17) and the No. 2 hydraulic cylinder (18) are displaced to a first position, and the No. 2 position switch (10) is used to detect whether the piston rods of the No. 1 hydraulic cylinder (17) and the No. 2 hydraulic cylinder (18) are displaced to a second position.

3. The control method of a cylinder control hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a No. 2 one-way valve (11), the oil inlet of the No. 2 one-way valve (11) being connected to port A of the No. 1 electromagnetic reversing valve (2) and the oil inlet of the pressure-maintaining valve (8), and the oil outlet of the No. 2 one-way valve (11) being connected to the oil inlet of the two-way cartridge valve (3).

4. A control method for a cylinder control hydraulic system according to claim 1 or 3, characterized in that: The hydraulic system further comprises a No. 1 one-way throttle valve (12) and a No. 2 one-way throttle valve (13). The oil inlet of the No. 1 one-way throttle valve (12) is connected to the oil outlet of the pressure-maintaining valve (8), the B port of the two-way cartridge valve (3), the X port of the two-way cartridge valve (3), the A port of the No. 2 electromagnetic reversing valve (4), the oil inlet of the No. 2 overflow valve (6), and the A port of the hydraulically controlled oil return one-way valve (7). The oil outlet of the flow valve (12) is connected to the B chamber of the No. 1 hydraulic cylinder (17) and the B chamber of the No. 2 hydraulic cylinder (18), the oil inlet of the No. 2 one-way throttle valve (13) is connected to the B port of the No. 1 electromagnetic reversing valve (2) and the X port of the hydraulic control oil return one-way valve (7), and the oil outlet of the No. 2 one-way throttle valve (13) is connected to the A chamber of the No. 1 hydraulic cylinder (17) and the A chamber of the No. 2 hydraulic cylinder (18).

5. The control method of a cylinder control hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a filter (14), the oil inlet of the filter (14) being connected to the oil outlet of the No. 2 overflow valve (6), the oil outlet of the No. 1 overflow valve (5), the B port of the No. 2 electromagnetic reversing valve (4), the T port of the No. 1 electromagnetic reversing valve (2), and the B port of the hydraulically controlled oil return check valve (7), and the oil outlet of the filter (14) being connected to the oil tank (16).

6. The control method of a cylinder control hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a No. 1 one-way valve (15), the oil inlet of the No. 1 one-way valve (15) being connected to the oil outlet of the pump group (1), and the oil outlet of the No. 1 one-way valve (15) being connected to the P port of the No. 1 electromagnetic reversing valve (2).

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