A speed hydraulic control system for a winch

Abstract

The application provides a speed hydraulic control system of a winch, which comprises a first cartridge valve and a second cartridge valve, an A port of the first cartridge valve is connected with a first oil return port of an oil tank, a B port of the first cartridge valve is connected with a second port of a motor, an A port of the second cartridge valve is connected with a second oil return port of the oil tank, and a B port of the second cartridge valve is connected with the second port of the motor; a first oil outlet port of the oil tank is connected with a second oil outlet port of the oil tank and a first port of the motor, the first oil outlet port is further connected with a control end of the second cartridge valve, and the second oil outlet port is further connected with a control end of the first cartridge valve; the first oil outlet port of the oil tank is connected with the control end of the second cartridge valve, and the second oil outlet port is connected with the control end of the first cartridge valve; the first oil return port is further connected with the control end of the second cartridge valve, and the second oil return port is further connected with the control end of the first cartridge valve; the oil circuit has a simple structure, and only a simple control valve is needed to realize speed adjustment of the motor.

Description

Technical Field

[0001] This invention relates to the field of winch control system technology, and more specifically to a winch speed hydraulic control system. Background Technology

[0002] Modern ship winches should all have the function of "low speed under heavy load and high speed under light load". This function is achieved by switching between high and low speeds of variable displacement motors. That is, the motor displacement is changed through the variable displacement mechanism of the motor, thereby changing the output torque and speed of the motor.

[0003] For example, Chinese patent application No. 200610002237.9, published on March 12, 2008, discloses a skid-mounted electro-hydraulic proportional speed control system, including a bidirectional variable pump, a bidirectional variable motor, and two skid-mounted electro-hydraulic proportional speed control valves connected in series between the circuits formed by the bidirectional variable pump and the bidirectional variable motor, with their control ports connected in parallel. The skid-mounted electro-hydraulic proportional speed control valves include a main valve and an electro-hydraulic proportional speed control valve connected in parallel. The main valve consists of a check valve and a hydraulic spool valve connected in parallel. When there is no pressurized oil at the control port, the oil passage between the inlet and outlet of the hydraulic spool valve is open; when there is pressurized oil at the control port, the oil passage between the inlet and outlet of the valve is closed. The skid-mounted electro-hydraulic proportional speed control valve proposed in this invention can meet the requirements for use in Class II petroleum explosion-proof areas. The skid-mounted electro-hydraulic proportional speed control system has both volumetric speed control and electro-hydraulic proportional throttling speed control functions and can automatically switch between them. This system can achieve precise flow rate adjustment, ensuring the normal and stable operation of the motor in both speed control circuits.

[0004] This paper proposes speed regulation by setting a variable displacement motor. However, variable displacement motors are expensive, have large internal leakage, and are inefficient. In practical applications, cost and oil circuit connections also need to be considered. Summary of the Invention

[0005] This invention provides a speed hydraulic control system for a winch. The oil circuit structure is simple, and only a simple control valve is needed to adjust the speed of the motor.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a speed hydraulic control system for a winch, comprising a first cartridge valve and a second cartridge valve. Port A of the first cartridge valve is connected to a first return port of an oil tank, and port B of the first cartridge valve is connected to a second port of a motor. Port A of the second cartridge valve is connected to a second return port of the oil tank, and port B of the second cartridge valve is connected to the second port of the motor. The first port of the motor is connected to a first outlet port and a second outlet port of the oil tank. The first outlet port is also connected to the control terminal of the second cartridge valve, and the second outlet port is also connected to the control terminal of the first cartridge valve. The first outlet port of the oil tank is connected to the control terminal of the second cartridge valve, and the second outlet port is connected to the control terminal of the first cartridge valve. The first return port is also connected to the control terminal of the second cartridge valve, and the second return port is also connected to the control terminal of the first cartridge valve. The hydraulic oil flow rate of the first cartridge valve is higher than that of the second cartridge valve.

[0007] The above structure, by setting two cartridge valves with different flow rates, allows the low-flow cartridge valve to be used for driving when low-speed lifting and lowering are required, and the high-flow cartridge valve to be used when high speed is required. Furthermore, when one cartridge valve is used for driving, a branch can be set off in the normal flow oil circuit to control and close the other cartridge valve, so that the two cartridge valves do not interfere with each other. This ensures that high and low speed control is not hindered by the other cartridge valve, thus enabling high and low speed control of the winch through a simple oil circuit.

[0008] Furthermore, a first shuttle valve is provided between the control end of the first cartridge valve and the second return port. The first port of the first shuttle valve is connected to the second return port, the second port of the first shuttle valve is connected to the oil tank, and the third port of the first shuttle valve is connected to the control end of the first cartridge valve.

[0009] The above settings control the flow direction of hydraulic oil through the setting of the first shuttle valve, thereby facilitating the control of the first cartridge valve.

[0010] Furthermore, a second shuttle valve is provided between the control end of the second cartridge valve and the first return port. The first port of the second shuttle valve is connected to the first return port, the second port of the second shuttle valve is connected to the oil tank, and the third port of the second shuttle valve is connected to the control end of the second cartridge valve.

[0011] The above settings control the flow direction of hydraulic oil through the setting of the second shuttle valve, thereby facilitating the control of the second cartridge valve.

[0012] Furthermore, a first balance valve is provided between the first oil outlet and the motor. The first balance valve includes a first overflow valve and a first check valve. The oil inlet of the first overflow valve is connected to the first port of the motor, the oil outlet of the first overflow valve is connected to the first oil outlet, the oil inlet of the first check valve is connected to the first oil outlet, and the oil outlet of the first check valve is connected to the first port of the motor. The control end of the first overflow valve is connected to the first return port.

[0013] The above settings, by setting a first balance valve, ensure that the hydraulic oil pressure flowing from the first oil outlet to the motor is stable.

[0014] Furthermore, a second balance valve is provided between the second oil outlet and the motor. The second balance valve includes a second overflow valve and a second check valve. The oil inlet of the second overflow valve is connected to the first port of the motor, the oil outlet of the second overflow valve is connected to the second oil outlet, the oil inlet of the second check valve is connected to the second oil outlet, and the oil outlet of the second check valve is connected to the first port of the motor. The control end of the second overflow valve is connected to the second return port.

[0015] The above settings, by setting a second balance valve, ensure that the hydraulic oil pressure flowing from the second oil outlet to the motor is stable.

[0016] Furthermore, a third shuttle valve is provided between the first oil outlet and the second shuttle valve. The first port of the third shuttle valve is connected to the first oil outlet, the second port of the third shuttle valve is connected to the first oil return port, and the third port of the third shuttle valve is connected to the first port of the second shuttle valve.

[0017] The above settings allow hydraulic oil to flow to the third shuttle valve, which in turn drives the first and third ports of the third shuttle valve to connect. This allows the hydraulic oil to flow through the third shuttle valve to the second shuttle valve and then through the second shuttle valve into the control terminal of the second cartridge valve, thereby driving the second cartridge valve to close.

[0018] Furthermore, a fourth shuttle valve is provided between the second oil outlet and the first shuttle valve. The first port of the fourth shuttle valve is connected to the second oil outlet, the second port of the fourth shuttle valve is connected to the first oil outlet, and the third port of the fourth shuttle valve is connected to the first port of the first shuttle valve.

[0019] The above configuration involves hydraulic oil flowing to the fourth shuttle valve, which in turn drives the first and third ports of the fourth shuttle valve to connect. This allows the hydraulic oil to flow through the fourth shuttle valve to the first shuttle valve and then through the first shuttle valve into the control terminal of the first cartridge valve, thereby driving the first cartridge valve to close.

[0020] Furthermore, a manual oil pump is provided between the second port of the first shuttle valve and the second port of the second shuttle valve and the oil tank.

[0021] The above settings, through the manual oil pump, enable hydraulic oil to be pumped into the control terminals of the first and second cartridge valves when maintenance or repair of the oil circuit is required, thereby driving the first and second cartridge valves to close. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hydraulic system of the present invention.

[0023] Figure 2 for Figure 1 A schematic diagram of the connection of the first balancing valve. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1-2 As shown, a speed hydraulic control system for a winch includes a first cartridge valve 1 and a second cartridge valve 2. Port A of the first cartridge valve 1 is connected to the first return port 31 of an oil tank 3, and port B of the first cartridge valve 1 is connected to the second port 41 of a motor 4. Port A of the second cartridge valve 2 is connected to the second return port 32 of the oil tank 3, and port B of the second cartridge valve 2 is connected to the second port 41 of the motor 4. The first port 42 of the motor 4 is connected to the first outlet port 33 and the second outlet port 34 of the oil tank 3. The first outlet port 33 also... The first oil outlet 31 of the oil tank 3 is connected to the control terminal 21 of the second cartridge valve 2, and the second oil outlet 34 is connected to the control terminal 11 of the first cartridge valve 1. The first oil return port 31 is also connected to the control terminal 21 of the second cartridge valve 2, and the second oil return port 32 is also connected to the control terminal 11 of the first cartridge valve 1. The hydraulic oil flow rate of the first cartridge valve 1 is higher than that of the second cartridge valve 2.

[0026] A first shuttle valve 12 is provided between the control end 11 of the first cartridge valve 1 and the second return port 32. The first port 121 of the first shuttle valve 12 is connected to the second return port 32, the second port 122 of the first shuttle valve 12 is connected to the oil tank 3, and the third port 123 of the first shuttle valve 12 is connected to the control end 11 of the first cartridge valve 1. The first shuttle valve 12 controls the flow direction of the hydraulic oil, thereby facilitating the control of the first cartridge valve 1.

[0027] A second shuttle valve 22 is provided between the control end 21 of the second cartridge valve 2 and the first return port 31. The first port 221 of the second shuttle valve 22 is connected to the first return port 31, the second port 222 of the second shuttle valve 22 is connected to the oil tank 3, and the third port 223 of the second shuttle valve 22 is connected to the control end 21 of the second cartridge valve 2. The second shuttle valve 22 controls the flow direction of the hydraulic oil, thereby facilitating the control of the second cartridge valve 2.

[0028] A first balance valve 35 is provided between the first oil outlet 33 and the motor 4. The first balance valve 35 includes a first relief valve 351 and a first check valve 352. The oil inlet of the first relief valve 351 is connected to the first port 42 of the motor 4, and the oil outlet of the first relief valve 351 is connected to the first oil outlet 33. The oil inlet of the first check valve 352 is connected to the first oil outlet 33, and the oil outlet of the first check valve 352 is connected to the first port 42 of the motor 4. The control terminal 3511 of the first relief valve 351 is connected to the first return port 31. By setting the first balance valve 35, the hydraulic oil pressure flowing from the first oil outlet 33 to the motor 4 is stabilized.

[0029] A second balance valve 36 is provided between the second oil outlet 34 and the motor 4. The second balance valve 36 includes a second relief valve 361 and a second check valve 362. The oil inlet end of the second relief valve 361 is connected to the first port 42 of the motor 4, and the oil outlet end of the second relief valve 361 is connected to the second oil outlet 34. The oil inlet end of the second check valve 362 is connected to the second oil outlet 34, and the oil outlet end of the second check valve 362 is connected to the first port 42 of the motor 4. The control end 3611 of the second relief valve 361 is connected to the second return port 32. By setting the second balance valve 36, the hydraulic oil pressure flowing from the second oil outlet 34 to the motor 4 is stabilized.

[0030] A third shuttle valve 23 is provided between the first oil outlet 33 and the second shuttle valve 22. The first port 231 of the third shuttle valve 23 is connected to the first oil outlet 33, the second port 232 of the third shuttle valve 23 is connected to the first oil return port 31, and the third port 233 of the third shuttle valve 23 is connected to the first port 221 of the second shuttle valve 22. Hydraulic oil flows to the third shuttle valve 23, driving the first port 231 and the third port 233 of the third shuttle valve 23 to connect, so that the hydraulic oil flows through the third shuttle valve 23 to the second shuttle valve 22 and then through the second shuttle valve 22 into the control terminal 21 of the second cartridge valve 2, driving the second cartridge valve 2 to close.

[0031] A fourth shuttle valve 24 is also provided between the second oil outlet 34 and the first shuttle valve 12. The first port 241 of the fourth shuttle valve 24 is connected to the second oil outlet 34, the second port 242 of the fourth shuttle valve 24 is connected to the first oil outlet 33, and the third port 243 of the fourth shuttle valve 24 is connected to the first port 121 of the first shuttle valve 12. The hydraulic oil flows to the fourth shuttle valve 24, which drives the first port 241 and the third port 243 of the fourth shuttle valve 24 to connect, so that the hydraulic oil flows through the fourth shuttle valve 24 to the first shuttle valve 12 and then through the first shuttle valve 12 into the control terminal 11 of the first cartridge valve 1, driving the first cartridge valve 1 to close.

[0032] A manual oil pump 39 is provided between the second port 122 of the first shuttle valve 12 and the second port 222 of the second shuttle valve 22 and the oil tank 3. The manual oil pump 39 allows hydraulic oil to be drawn into the control terminals of the first cartridge valve 1 and the second cartridge valve 2 when maintenance or repair of the oil circuit is required, thereby driving the first cartridge valve 1 and the second cartridge valve 2 to close.

[0033] The working principle of this invention is as follows: By setting two cartridge valves with different flow rates, the low-flow cartridge valve is used for driving when low-speed lifting and lowering are required, while the high-flow cartridge valve is used when high speed is required. Furthermore, when one cartridge valve is used for driving, a branch can be created in the normal flow oil circuit to control and close the other cartridge valve, so that the two cartridge valves do not interfere with each other. This ensures that high and low speed control is not hindered by the other cartridge valve, thus enabling high and low speed control of the winch through a simple oil circuit.

[0034] When high and low speed control of the winch is required, the winch lifts at low speed: oil is discharged from the second outlet 34 of the oil tank 3, and the hydraulic oil circuit is divided into two paths. One path of hydraulic oil enters the motor 4 through the first port 42. The other path of hydraulic oil passes through the fourth shuttle valve 24 and then enters the first port 121 of the first shuttle valve 12, flowing to the control end 11 of the first cartridge valve 1, driving the first cartridge valve 1 to close. The hydraulic oil flowing into the motor 4 flows out from the second port 41 of the motor 4 and passes through the B end of the second cartridge valve 2, flowing back to the oil tank 3 through the second return port 32, thereby driving the motor 4 to rotate for low-speed lifting.

[0035] High-speed hoisting of the winch: Oil flows from the first outlet 33 of the oil tank 3, and the hydraulic oil circuit is divided into two paths. One path of hydraulic oil enters the motor 4 through the first port 42. The other path of hydraulic oil flows through the third shuttle valve 23 to the control end 21 of the second cartridge valve 2, driving the second cartridge valve 2 to close. The hydraulic oil flowing into the motor 4 flows out from the second port 41 of the motor 4 and flows back to the oil tank 3 through the B end of the first cartridge valve 1 from the first return port 31, thereby driving the motor 4 to rotate for high-speed hoisting.

[0036] Low-speed descent of the winch: Oil flows from the second return port 32 of the oil tank 3, and the hydraulic oil circuit is divided into three paths. One path of hydraulic oil enters the second cartridge valve 2 through end A and flows through end B of the second cartridge valve 2 to the second port 41 of the motor 4. Another path of hydraulic oil flows to the control end 11 of the first cartridge valve 1, driving the first cartridge valve 1 to close. The hydraulic oil flowing into the motor 1 flows out from the first port 42 of the motor 1 and flows back to the oil tank 3 from the second outlet 34, thereby driving the motor 4 to rotate and descend at low speed. The third path of hydraulic oil flows to the control end 3611 of the second relief valve 361. The second relief valve 361 opens, connecting the second inlet port 34 with the first port 42 of the motor 4, and the hydraulic oil flows back to the oil tank from the second outlet 34.

[0037] High-speed descent of the winch: Oil flows from the first return port 31 into the oil tank 3, and the hydraulic oil circuit is divided into three paths. One path of hydraulic oil enters the first cartridge valve 1 through end A and flows through end B of the first cartridge valve 1 to the second port 41 of the motor 4. Another path of hydraulic oil flows to the control end 21 of the second cartridge valve 2, driving the second cartridge valve 2 to close. The hydraulic oil flowing into the motor 4 flows out from the first port 42 of the motor 4 and flows back to the oil tank 3 from the first outlet 33, thereby driving the motor 4 to rotate and descend at high speed. The third path of hydraulic oil flows to the control end 3511 of the first relief valve 351. The first relief valve 351 opens, connecting the first inlet 33 with the first port 42 of the motor 4, and the hydraulic oil flows back to the oil tank from the first outlet 33.

Claims

1. A speed hydraulic control system for a winch, characterized in that: The system includes a first cartridge valve and a second cartridge valve. Port A of the first cartridge valve is connected to the first return port of the oil tank, and port B of the first cartridge valve is connected to the second port of the motor. Port A of the second cartridge valve is connected to the second return port of the oil tank, and port B of the second cartridge valve is connected to the second port of the motor. The first port of the motor is connected to the first and second outlet ports of the oil tank. The first outlet port is also connected to the control terminal of the second cartridge valve, and the second outlet port is also connected to the control terminal of the first cartridge valve. The first outlet port of the oil tank is connected to the control terminal of the second cartridge valve, and the second outlet port is connected to the control terminal of the first cartridge valve. The first return port is also connected to the control terminal of the second cartridge valve, and the second return port is also connected to the control terminal of the first cartridge valve. The hydraulic oil flow rate of the first cartridge valve is higher than that of the second cartridge valve. A first balance valve is provided between the first oil outlet and the motor. The first balance valve includes a first overflow valve and a first check valve. The oil inlet of the first overflow valve is connected to the first port of the motor, the oil outlet of the first overflow valve is connected to the first oil outlet, the oil inlet of the first check valve is connected to the first oil outlet, and the oil outlet of the first check valve is connected to the first port of the motor. The control end of the first overflow valve is connected to the first return port. A second balance valve is provided between the second oil outlet and the motor. The second balance valve includes a second overflow valve and a second check valve. The oil inlet of the second overflow valve is connected to the first port of the motor, the oil outlet of the second overflow valve is connected to the second oil outlet, the oil inlet of the second check valve is connected to the second oil outlet, and the oil outlet of the second check valve is connected to the first port of the motor. The control end of the second overflow valve is connected to the second return port.

2. The speed hydraulic control system for a winch according to claim 1, characterized in that: A first shuttle valve is provided between the control end of the first cartridge valve and the second return port. The first port of the first shuttle valve is connected to the second return port, the second port of the first shuttle valve is connected to the oil tank, and the third port of the first shuttle valve is connected to the control end of the first cartridge valve.

3. The speed hydraulic control system for a winch according to claim 2, characterized in that: A second shuttle valve is provided between the control end of the second cartridge valve and the first return port. The first port of the second shuttle valve is connected to the first return port, the second port of the second shuttle valve is connected to the oil tank, and the third port of the second shuttle valve is connected to the control end of the second cartridge valve.

4. The speed hydraulic control system for a winch according to claim 3, characterized in that: A third shuttle valve is provided between the first oil outlet and the second shuttle valve. The first port of the third shuttle valve is connected to the first oil outlet, the second port of the third shuttle valve is connected to the first oil return port, and the third port of the third shuttle valve is connected to the first port of the second shuttle valve.

5. The speed hydraulic control system for a winch according to claim 2, characterized in that: A fourth shuttle valve is provided between the second oil outlet and the first shuttle valve. The first port of the fourth shuttle valve is connected to the second oil outlet, the second port of the fourth shuttle valve is connected to the first oil outlet, and the third port of the fourth shuttle valve is connected to the first port of the first shuttle valve.

6. The speed hydraulic control system for a winch according to claim 3, characterized in that: A manual oil pump is provided between the second port of the first shuttle valve and the second port of the second shuttle valve and the oil tank.

Images