A Hydraulic Cylinder Control System Based on Multi-way Valve

Abstract

This paper proposes a hydraulic cylinder control system based on a multi-way valve, including an oil tank and a hydraulic cylinder. The oil tank controls the extension or retraction of the hydraulic cylinder through the multi-way valve; the working oil port of the cylinder working piece of the multi-way valve is connected to the rodless chamber of the hydraulic cylinder through the first manual valve and the two-way balancing valve. At the same time, the piston rod chamber of the hydraulic cylinder is connected to another working oil port of the working piece on the multi-way valve through the two-way balancing valve and the second manual valve. At least two manual valves are provided between the cylinder working piece of the multi-way valve and the two-way balancing valve. The design of this hydraulic cylinder control system significantly improves the flexibility of operation and the flexibility of the system, and also enhances the reliability and maintainability of the system. This can enable the system to have a wider range of application scenarios under variable working conditions.

Description

Technical Field

[0001] This article relates to a hydraulic cylinder control system based on a multi-way valve. Background Art

[0002] With the acceleration of industrialization, hydraulic systems are widely used in engineering machinery, industrial automation, aerospace, transportation and logistics and other industries. As a basic component for achieving reciprocating linear motion, compression and extension, the precise and reliable control of hydraulic cylinders is directly related to the working efficiency and safety of equipment. The control system of hydraulic cylinders is the core part for achieving precise control.

[0003] Traditional hydraulic cylinder control systems mostly involve basic hydraulic components such as check valves and speed control valves to achieve start and stop control, working speed adjustment and direction conversion of hydraulic cylinders. However, with the improvement of technical requirements, the control methods of traditional hydraulic systems have shown certain limitations in terms of flexibility, automation and energy efficiency. The main problems are complex control, slow response, high energy consumption, safety restrictions and difficult maintenance. Summary of the invention

[0004] In order to solve the above problems, this paper proposes a hydraulic cylinder control system based on a multi-way valve with a faster operating system.

[0005] A hydraulic cylinder control system based on a multi-way valve comprises an oil tank and a hydraulic cylinder, wherein the oil tank controls the extension or retraction of the hydraulic cylinder through the multi-way valve;

[0006] The working oil port of the cylinder working piece of the multi-way valve is connected to the rodless chamber of the hydraulic cylinder through the first manual valve and the two-way balancing valve. At the same time, the piston rod chamber of the hydraulic cylinder is connected to another working oil port of the working piece on the multi-way valve through the two-way balancing valve and the second manual valve. At least two manual valves are arranged between the cylinder working piece of the multi-way valve and the two-way balancing valve.

[0007] Furthermore, different working oil ports of the multi-way valve are connected to the accumulator through the second one-way valve and the third one-way valve respectively, and through the cylinder working piece of the multi-way valve, the accumulator is filled with fluid through a manual pump or an oil pump motor unit when the hydraulic cylinder is in the retracted state and the extended state respectively.

[0008] The design of the relief valve helps to protect the system from overload and prevent equipment damage caused by excessive pressure. The multi-way valve is equipped with a relief valve, a cylinder working piece and a winch working piece. The cylinder working piece and the winch working piece in the system are designed to be connected in parallel with the relief valve, providing a variety of working mode options to meet different operating requirements.

[0009] Furthermore, the oil cylinder working piece and the winch working piece are both connected in parallel with the overflow valve.

[0010] The back pressure valve can adjust the back pressure of the return oil to ensure the stability of the hydraulic system and prevent wear caused by excessive pressure shock due to high-speed movement. The return oil port of the multi-way valve is connected to the oil tank through the back pressure valve and the return oil filter in turn. The use of the return oil filter ensures the cleanliness of the return oil and extends the service life of the hydraulic oil and the hydraulic system.

[0011] Beneficial effects:

[0012] Compared with the traditional control structure, the use of the multi-way valve in this solution can integrate multiple working logics on one control unit, reduce the external pipeline layout, make signal transmission more direct, and facilitate automatic control. And through the design of the first manual valve and the second manual valve, the action of extending or retracting the hydraulic cylinder can be flexibly controlled.

[0013] The use of a two-way balancing valve helps achieve dynamic balance on both sides of extension or retraction, reducing impact and vibration during the movement of the hydraulic cylinder. The design of multiple manual valves can manually adjust or switch the backup path under certain faults, increasing the flexibility and maintainability of the system. By linking the accumulator connected to the second one-way valve and the third one-way valve, the energy storage device can be efficiently filled with liquid under different working conditions of the hydraulic cylinder, thereby improving the energy utilization efficiency of the system. The fast switching function of the multi-way valve can improve the response time of the hydraulic cylinder, which is critical for application scenarios that require fast and accurate control.

[0014] Through effective control paths and optimized system design, energy consumption can be reduced while ensuring the normal operation of the system, achieving energy-saving effects. The comprehensive design of multiple components within the system improves the efficiency of the device and reduces downtime caused by failure of a single component.

[0015] The design of this hydraulic cylinder control system significantly improves the flexibility of operation and the flexibility of the system, while also enhancing the reliability and maintainability of the system. This can enable the system to have a wider range of application scenarios under variable working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the hydraulic principle diagram of the overall control system;

[0017] Figure 2 It is the hydraulic principle diagram of the connection part between the multi-way valve and the hydraulic cylinder;

[0018] Figure 3 It is the schematic diagram of the hydraulic connection between the motor valve group and the hydraulic motor;

[0019] in:

[0020] 1. Oil pump motor unit 2. Manual valve 3. First one-way valve 4. Multi-way valve 5. First stop valve 6. Second one-way valve 7. Second stop valve 8. Third one-way valve 9. Accumulator 10. Hydraulic cylinder 11. Two-way balancing valve 12. First manual valve 13. Booster pump 14. Oil supply valve 15. Motor valve group 16. Hydraulic motor 17. Second manual valve 18. Hydraulic reversing valve 19. Third manual valve 20. Back pressure valve 21. Return oil filter 22. Fourth manual valve 41. Overflow valve 42. Cylinder working piece 43. Winch working piece 151. First shuttle valve 152. Second shuttle valve 153. One-way balancing valve 154. Hydraulic control reversing valve 155. Speed ​​regulating valve 156. One-way pressure reducing valve 157. Hydraulic reversing valve. DETAILED DESCRIPTION

[0021] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0022] Embodiment 1:

[0023] During normal operation, when the davit arm of the lifeboat launching device needs to be rotated outboard (the hydraulic cylinder extends), the high-pressure oil from the oil pump motor unit 1 passes through the first one-way valve 3, the cylinder working piece 42 in the multi-way valve 4, the first manual valve 12, the right side of the two-way balancing valve 11, and the rodless chamber of the hydraulic cylinder 10 in sequence; the hydraulic oil in the piston rod of the hydraulic cylinder 10 flows back to the oil tank through the left side of the two-way balancing valve 11, the fourth manual valve 22, the cylinder working piece 42 in the multi-way valve 4, the back pressure valve 20, and the return oil filter 21 in sequence. When the davit arm of the lifeboat launching device needs to be moved from outside to inside the ship (the hydraulic cylinder retracts), the high-pressure oil from the oil pump motor unit 1 passes through the first one-way valve 3, the cylinder working piece 42 in the multi-way valve 4, the fourth manual valve 22, the left side of the two-way balancing valve 11, and the piston rod chamber of the hydraulic cylinder 10 in sequence; the hydraulic oil in the rodless chamber of the hydraulic cylinder 10 passes through the right side of the two-way balancing valve 11, passes through the first manual valve 12, the cylinder working piece 42 in the multi-way valve 4, the back pressure valve 20, and the return oil filter 21 and flows back to the oil tank. When the lifeboat launching device electrically lifts the lifeboat raft, the high-pressure oil from the oil pump motor group 1 passes through the first one-way valve 3, the winch working piece 43 in the multi-way valve 4, the hydraulic reversing valve 18 in sequence, and one path of hydraulic oil passes through the second shuttle valve 152, the first shuttle valve 151, the hydraulic reversing valve 157, and the one-way pressure reducing valve 156 to release the brake; the other path of hydraulic oil passes through the one-way balance valve 153 in the winch valve group 15, enters the B1 port of the hydraulic motor 16, and then passes through the A1 port of the hydraulic motor 16, flows through the winch working piece 43 in the multi-way valve 4, the back pressure valve 20, and the return oil filter 21 to flow back to the oil tank.

[0024] When the lifeboat launching device electrically lowers the lifeboat raft, the high-pressure oil from the oil pump motor group 1 passes through the first one-way valve 3 and the winch working piece 43 in the multi-way valve 4 in sequence. One path of hydraulic oil releases the brake through the second shuttle valve 152, the first shuttle valve 151, the hydraulic reversing valve 157, and the one-way pressure reducing valve 156; the other path of hydraulic oil enters the A1 port of the hydraulic motor 16, and then flows through the B1 port of the hydraulic motor 16, through the one-way balance valve 153 in the winch valve group 15, the hydraulic reversing valve 18, the winch working piece 43 in the multi-way valve 4, the back pressure valve 20, and the return oil filter 21 and flows back to the oil tank.

[0025] When it is necessary to lower the lifeboat raft by gravity, open the second stop valve 7, and remotely open the first manual valve 12 through the remote control wire rope on the handle of the first manual valve 12. The high-pressure oil in the accumulator 9 enters the rodless chamber of the hydraulic cylinder 10 through the second stop valve 7, the first manual valve 12, and the right side of the two-way balancing valve 11. The hydraulic oil in the piston rod of the hydraulic cylinder 10 flows back to the oil tank through the left side of the two-way balancing valve 11 through the fourth manual valve 22, the cylinder working piece 42 in the multi-way valve 4, the back pressure valve 20, and the return oil filter 21. When the davit arm of the lifeboat launching device is completely turned outboard, the handle of the first manual valve 12 is released, the first manual valve 12 is reset to the original position, and then the second manual valve 17 is remotely opened through the remote control wire rope on the handle of the second manual valve 17, and the high-pressure oil in the accumulator 9 passes through the second stop valve 7 and the second manual valve 17. One hydraulic oil passes through the first shuttle valve 151, the hydraulic reversing valve 157, and the one-way pressure reducing valve 156 to release the brake; the other hydraulic oil opens the hydraulic control reversing valve 154, so that the high-pressure oil at the B1 port of the hydraulic motor 16 drives the motor side of the booster pump 13 through the hydraulic control reversing valve 154 and the speed regulating valve 155. At the same time, the oil pump side of the booster pump 13 outputs the hydraulic oil with a lower pressure under the drive of the motor side of the booster pump 13 to enter the A1 port (low-pressure side) of the hydraulic motor 16, so that the hydraulic motor 16 forms a circuit, and the boat lifting winch performs the boat releasing action. As needed, the control handle of the second manual valve 17 can be released at any time, and the boat lifting winch immediately stops the boat releasing action. It should be noted that the displacement of the motor side of the boost pump 13 should be slightly smaller than that of the oil pump side, so that the difference can be used to supplement the leakage of the hydraulic motor.

[0026] When it is necessary to manually recover the lifeboat, open the second stop valve 7, manually control the third manual valve 19, and the high-pressure oil in the accumulator 9 passes through the second stop valve 7, the third manual valve 19, the hydraulic reversing valve 18, and one way of hydraulic oil passes through the second shuttle valve 152, the first shuttle valve 151, the hydraulic reversing valve 157, and the one-way pressure reducing valve 156 to release the brake; the other way of hydraulic oil passes through the one-way balance valve 153 in the winch valve group 15, enters the B1 port of the hydraulic motor 16, and then passes through the A1 port of the hydraulic motor 16, flows through the winch working piece 43 in the multi-way valve 4, the back pressure valve 20, and the return oil filter 21 to flow back to the oil tank.

[0027] After the boat winch lifts the lifeboat to a certain height, the pressure in the accumulator 9 will drop to the opening pressure of the hydraulic reversing valve 18, and the hydraulic reversing valve 18 will begin to close, and the boat winch will stop lifting the lifeboat to prevent the hydraulic motor from continuing to lose pressure oil due to leakage under medium and low pressure conditions when the pressure in the accumulator 9 is insufficient to lift the lifeboat.

[0028] Generally, the opening pressure of the hydraulic valve 18 should be equal to or slightly higher than the pressure of lifting a fully loaded lifeboat. At this time, the third manual valve 19 can be loosened, and the third manual valve 19 is reset under the action of the spring. The manual pump 2 is manually operated, and the cylinder working piece of the multi-way valve 4 is placed in the cylinder extension state, and the accumulator 9 is filled with liquid until the liquid is filled to the specified value (generally about 1MPa lower than the system set pressure value), and then the third manual valve 19 is opened, and the lifeboat is lifted again through the accumulator 9 until the lifeboat is lifted to a suitable position, and the third manual valve 19 is loosened, and the third manual valve 19 is reset under the action of the spring. When the lifeboat is lifted to a suitable position, the fourth manual valve 22 is manually controlled when the second stop valve 7 is in the open state, and the high-pressure oil in the accumulator 9 enters the piston rod chamber of the hydraulic cylinder 10 through the second stop valve 7, the fourth manual valve 22, and the left side of the two-way balancing valve 11. The hydraulic oil in the rodless chamber of the hydraulic cylinder 10 flows through the right side of the two-way balancing valve 11 through the first manual valve 12, the cylinder working piece 42 in the multi-way valve 4, the back pressure valve 20, and the return oil filter 21 and flows back to the oil tank.

[0029] At this time, the davit arm of the lifeboat lowering device is turned from the outboard to the inboard position. If the oil pressure in the accumulator is insufficient, the shutoff 7 can be closed and the accumulator can be directly charged through the manual pump 2 and the cylinder working piece of the multi-way valve 4.

[0030] When the lifeboat is lowered by gravity, the gravity lowering circuit of the boat winch can be infinitely replenished with oil only by the weight of the lifeboat itself, without increasing the accumulator for replenishing oil or the auxiliary oil tank for replenishing oil; when the boat winch manually lifts the lifeboat, the improvement of the working circuit of the boat winch avoids the continuous loss of pressure oil due to leakage of the hydraulic motor under medium and low pressure conditions during the period of oil suction and pressure establishment of the manual pump, thereby improving the efficiency and speed of the boat winch manually lifting the lifeboat. In addition, after the boat winch manually lifts the lifeboat, the pressure oil stored in the accumulator is fully utilized to drive the hydraulic cylinder to retract the boat arm of the lifeboat lowering device to the storage position, thereby reducing the work done by manpower.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder control system based on a multi-way valve, comprising an oil tank and a hydraulic cylinder, characterized in that: The oil tank controls the extension or retraction of the hydraulic cylinder through a multi-way valve; The working oil port of the cylinder working piece of the multi-way valve is connected to the rodless chamber of the hydraulic cylinder through the first manual valve and the two-way balancing valve. At the same time, the piston rod chamber of the hydraulic cylinder is connected to another working oil port of the working piece on the multi-way valve through the two-way balancing valve and the second manual valve. At least two manual valves are arranged between the cylinder working piece of the multi-way valve and the two-way balancing valve.

2. A hydraulic cylinder control system based on a multi-way valve according to claim 1, characterized in that: Different working oil ports of the multi-way valve are connected to the accumulator through the second one-way valve and the third one-way valve respectively, and through the cylinder working piece of the multi-way valve, the accumulator is filled with fluid through a manual pump or an oil pump motor unit when the hydraulic cylinder is in the retracted state and the extended state respectively.

3. A hydraulic cylinder control system based on a multi-way valve according to claim 1, characterized in that: The multi-way valve is provided with an overflow valve, a cylinder working piece and a winch working piece.

4. A hydraulic cylinder control system based on a multi-way valve according to claim 3, characterized in that: The oil cylinder working piece and the winch working piece are both connected in parallel with the overflow valve.

5. A hydraulic cylinder control system based on a multi-way valve according to claim 1, characterized in that: The oil return port of the multi-way valve is connected to the oil tank through the back pressure valve and the oil return filter in sequence.

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