Hydraulic speed control system of winch

Abstract

The invention provides a winch speed hydraulic control system 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 end of the second cartridge valve is connected with a second port of the motor. A first port of the motor is connected with a first oil outlet and a second oil outlet of the oil tank, the first oil outlet is further connected with the control end of the second cartridge valve, and the second oil outlet is further connected with the control end of the first cartridge valve. A first oil outlet of the oil tank is connected with the control end of the second cartridge valve, and a second oil outlet is connected with the control end of the first cartridge valve; the first oil return opening is further connected with the control end of the second cartridge valve, and the second oil return opening is further connected with the control end of the first cartridge valve. The oil way is simple in structure, and the speed of the motor can be adjusted only through a simple control valve.

Description

Technical Field

[0001] The invention relates to the technical field of winch control systems, and in particular to a speed hydraulic control system for a winch. Background Art

[0002] Nowadays, all kinds of ship winches should have the function of "heavy load and low speed, light load and high speed", and their functions are realized by switching the variable speed motor between high and low speed, that is, the motor displacement is changed through the motor variable mechanism, thereby changing the output torque and speed of the motor.

[0003] For example, the patent document with Chinese patent application number 200610002237.9 and publication date 2008.03.12 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 respectively connected in series between the circuits formed by the bidirectional variable pump and the bidirectional variable motor and connected in parallel with the control oil ports. The skid-mounted electro-hydraulic proportional speed control valve includes a main valve and an electro-hydraulic proportional speed control valve connected in parallel with each other, the main valve is composed of a check valve and a hydraulic slide valve connected in parallel, when there is no pressure oil in the control oil port, the oil path between the inlet and outlet valve ports of the hydraulic slide valve is connected, when there is pressure oil in the control oil port, the oil path between the inlet and outlet valve ports is blocked. The skid-mounted electro-hydraulic proportional speed control valve proposed in the invention can meet the requirements for use in Class II petroleum explosion-proof areas, the skid-mounted electro-hydraulic proportional speed control system has two speed control functions, namely, volume speed control and electro-hydraulic proportional throttling speed control, and can be automatically switched, the system can achieve fine flow adjustment, and ensure the normal and stable operation of the motor in the two speed control circuits.

[0004] This document realizes speed regulation by setting a variable motor, but the variable motor is expensive, has a large internal leakage, and has low efficiency. In actual application, cost issues and oil circuit connection also need to be considered. Summary of the invention

[0005] The invention provides a speed hydraulic control system for a winch, which has a simple oil circuit structure and can adjust the speed of a motor by only requiring a simple control valve.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a speed hydraulic control system of a winch, comprising a first cartridge valve and a second cartridge valve, wherein the A port of the first cartridge valve is connected to the first oil return port of the oil tank, the B port of the first cartridge valve is connected to the second port of the motor, the A port of the second cartridge valve is connected to the second oil return port of the oil tank, and the B end 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 oil outlet and the second oil outlet of the oil tank, the first oil outlet is also connected to the control end of the second cartridge valve, and the second oil outlet is also connected to the control end of the first cartridge valve; the first oil outlet of the oil tank is connected to the control end of the second cartridge valve, and the second oil outlet is connected to the control end of the first cartridge valve; the first oil return port is also connected to the control end of the second cartridge valve, and the second oil return port is also connected to the control end of the first cartridge valve; the hydraulic oil flow rate of the first cartridge valve is higher than the hydraulic oil flow rate of the second cartridge valve.

[0007] The above structure sets two cartridge valves with different flow rates, so that when low-speed lifting and lowering is required, the cartridge valve with low flow rate is used for driving, and when high speed is required, the cartridge valve with high flow rate is used. When one of the cartridge valves is used for driving, a branch can be separated in the normal flow oil circuit to control and close the other cartridge valve, so that the two cartridge valves will not interfere with each other, thus ensuring that high and low speed control will not be hindered by the other cartridge valve and cannot be performed, so that the high and low speeds of the winch can be controlled 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 oil return port, the first port of the first shuttle valve is connected to the second oil 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 arrangement controls the flow direction of the hydraulic oil through the arrangement 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 oil return port, the first port of the second shuttle valve is connected to the first oil 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 arrangement controls the flow direction of the hydraulic oil through the arrangement of the second shuttle valve, thereby facilitating the control of the second cartridge valve.

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

[0013] The above arrangement, by providing the first balancing valve, stabilizes the pressure of the hydraulic oil flowing from the first oil outlet to the motor.

[0014] Furthermore, a second balancing valve is provided between the second oil outlet and the motor, the second balancing valve includes a second overflow valve and a second one-way valve, the oil inlet end of the second overflow valve is connected to the first port of the motor, the oil outlet end of the second overflow valve is connected to the second oil outlet, the oil inlet end of the second one-way valve is connected to the second oil outlet, and the oil outlet end of the second one-way valve is connected to the first port of the motor; the control end of the second overflow valve is connected to the second oil return port.

[0015] The above arrangement, by providing the second balancing valve, stabilizes the pressure of the hydraulic oil flowing from the second oil outlet to the motor.

[0016] Furthermore, a third shuttle valve is provided between the first oil outlet and the second shuttle valve, wherein 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 arrangement allows the hydraulic oil to flow to the third shuttle valve, driving the first port and the third port of the third shuttle valve to be connected, so that the hydraulic oil flows through the third shuttle valve to the second shuttle valve and flows through the second shuttle valve into the control end of the second cartridge valve, 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, wherein 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; The above arrangement allows the hydraulic oil to flow to the fourth shuttle valve, driving the first port and the third port of the fourth shuttle valve to be connected, so that the hydraulic oil flows through the fourth shuttle valve to the first shuttle valve and flows through the first shuttle valve into the control end of the first cartridge valve, driving the first cartridge valve to close.

[0019] Furthermore, a manual oil pump is provided between the second port of the first shuttle valve, the second port of the second shuttle valve and the oil tank.

[0020] The above arrangement, through the setting of the manual oil pump, enables the hydraulic oil to be pumped into the control ends of the first cartridge valve and the second cartridge valve through the manual oil pump when the oil circuit needs to be maintained and repaired, thereby driving the first cartridge valve and the second cartridge valve to close. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the hydraulic system of the present invention.

[0022] Figure 2 for Figure 1 Connection diagram of the first balancing valve. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-Figure 2 As shown, a winch speed hydraulic control system includes a first cartridge valve 1 and a second cartridge valve 2, wherein the A port of the first cartridge valve 1 is connected to the first oil return port 31 of the oil tank 3, the B port of the first cartridge valve 1 is connected to the second port 41 of the motor 4, the A port of the second cartridge valve 2 is connected to the second oil return port 32 of the oil tank 3, and the B port 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 oil outlet 33 and the second oil outlet 34 of the oil tank 3, and the first oil outlet 33 is also connected to the second oil return port 32 of the oil tank 3. It is connected to the control end 21 of the second cartridge valve 2, and the second oil outlet 34 is also connected to the control end 11 of the first cartridge valve 1; the first oil outlet 31 of the oil tank 3 is connected to the control end 21 of the second cartridge valve 2, and the second oil outlet 34 is connected to the control end 11 of the first cartridge valve 1; the first oil return port 31 is also connected to the control end 21 of the second cartridge valve 2, and the second oil return port 32 is also connected to the control end 11 of the first cartridge valve 1; the hydraulic oil flow rate of the first cartridge valve 1 is higher than the hydraulic oil flow rate of the second cartridge valve 2.

[0025] A first shuttle valve 12 is provided between the control end 11 of the first cartridge valve 1 and the second oil return port 32, wherein a first port 121 of the first shuttle valve 12 is connected to the second oil return port 32, a second port 122 of the first shuttle valve 12 is connected to the oil tank 3, and a third port 123 of the first shuttle valve 12 is connected to the control end 11 of the first cartridge valve 1. The flow direction of the hydraulic oil is controlled by the setting of the first shuttle valve 12, thereby facilitating the control of the first cartridge valve 1.

[0026] A second shuttle valve 22 is provided between the control end 21 of the second cartridge valve 2 and the first oil return port 31, wherein a first port 221 of the second shuttle valve 22 is connected to the first oil return port 31, a second port 222 of the second shuttle valve 22 is connected to the oil tank 3, and a third port 223 of the second shuttle valve 22 is connected to the control end 21 of the second cartridge valve 2. The flow direction of the hydraulic oil is controlled by the setting of the second shuttle valve 22, thereby facilitating the control of the second cartridge valve 2.

[0027] A first balancing valve 35 is provided between the first oil outlet 33 and the motor 4. The first balancing valve 35 includes a first overflow valve 351 and a first check valve 352. The oil inlet end of the first overflow valve 351 is connected to the first port 42 of the motor 4, the oil outlet end of the first overflow valve 351 is connected to the first oil outlet 33, the oil inlet end of the first check valve 352 is connected to the first oil outlet 33, and the oil outlet end of the first check valve 352 is connected to the first port 42 of the motor 4; the control end 3511 of the first overflow valve 351 is connected to the first oil return port 31. By providing the first balancing valve 35, the pressure of the hydraulic oil flowing from the first oil outlet 33 to the motor 4 is stabilized.

[0028] A second balancing valve 36 is provided between the second oil outlet 34 and the motor 4, and the second balancing valve 36 includes a second overflow valve 361 and a second one-way valve 362, the oil inlet end of the second overflow valve 361 is connected to the first port 42 of the motor 4, the oil outlet end of the second overflow valve 361 is connected to the second oil outlet 34, the oil inlet end of the second one-way valve 362 is connected to the second oil outlet 34, and the oil outlet end of the second one-way valve 362 is connected to the first port 42 of the motor 4; the control end 3611 of the second overflow valve 361 is connected to the second oil return port 32; by setting the second balancing valve 36, the pressure of the hydraulic oil flowing from the second oil outlet 34 to the motor 4 is stabilized.

[0029] A third shuttle valve 23 is further provided between the first oil outlet 33 and the second shuttle valve 22, wherein a first port 231 of the third shuttle valve 23 is connected to the first oil outlet 33, a second port 232 of the third shuttle valve 23 is connected to the first oil return port 31, and a third port 233 of the third shuttle valve 23 is connected to the first port 221 of the second shuttle valve 22. The 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 communicate, so that the hydraulic oil flows to the second shuttle valve 22 through the third shuttle valve 23 and flows into the control end 21 of the second cartridge valve 2 through the second shuttle valve 22, driving the second cartridge valve 2 to close.

[0030] A fourth shuttle valve 24 is further provided between the second oil outlet 34 and the first shuttle valve 12, wherein 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, driving the first port 241 and the third port 243 of the fourth shuttle valve 24 to be connected, so that the hydraulic oil flows to the first shuttle valve 12 through the fourth shuttle valve 24 and flows into the control end 11 of the first cartridge valve 1 through the first shuttle valve 12, driving the first cartridge valve 1 to close.

[0031] A manual oil pump 39 is provided between the second port 122 of the first shuttle valve 12, the second port 222 of the second shuttle valve 22 and the oil tank 3. By providing the manual oil pump 39, when the oil circuit needs to be maintained and repaired, the manual oil pump 39 can pump hydraulic oil into the control ends of the first cartridge valve 1 and the second cartridge valve 2, thereby driving the first cartridge valve 1 and the second cartridge valve 2 to close.

[0032] The working principle of the present invention is as follows: by setting two cartridge valves with different flow rates, when low-speed lifting and lowering is required, the cartridge valve with low flow rate is used for driving, and when high speed is required, the cartridge valve with high flow rate is used. When one of the cartridge valves is used for driving, a branch can be separated in the normal flow oil circuit to control and close the other cartridge valve, so that the two cartridge valves will not interfere with each other, thus ensuring that high and low speed control will not be hindered by the other cartridge valve and cannot be performed, so that the high and low speeds of the winch can be controlled through a simple oil circuit.

[0033] When the winch needs to be controlled at high and low speeds, the winch is lifted at low speed: the oil tank 3 discharges oil from the second oil outlet 34, and the hydraulic oil circuit is divided into two. One hydraulic oil enters the motor 4 through the first port 42 of the motor 4. The other hydraulic oil passes through the fourth shuttle valve 24 and then enters the first port 121 of the first shuttle valve 12 and then 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 4 flows out from the second port 41 of the motor 4 and flows back to the oil tank 3 from the second oil return port 32 through the B end of the second cartridge valve 2, thereby driving the motor 4 to rotate for low-speed lifting.

[0034] High-speed lifting of winch: The oil tank 3 discharges oil from the first oil outlet 33, and the oil circuit of the hydraulic oil is divided into two circuits. One circuit of hydraulic oil enters the motor 4 through the first port 42 of the motor 4. The other circuit of hydraulic oil flows to the control end 21 of the second cartridge valve 2 through the third shuttle valve 23, 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 from the first oil return port 31 through the B end of the first cartridge valve 1, thereby driving the motor 4 to rotate for high-speed lifting.

[0035] The winch descends at a low speed: the oil tank 3 discharges oil from the second oil return port 32, and the hydraulic oil circuit is divided into three routes. One route of hydraulic oil enters the second cartridge valve 2 through the A end of the second cartridge valve 2, and flows to the second port 41 of the motor 4 through the B end of the second cartridge valve 2. Another route 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 oil outlet 34, thereby driving the motor 4 to rotate and descend at a low speed. The third route of hydraulic oil flows to the control end 3611 of the second overflow valve 361. The second overflow valve 361 is opened, the second oil inlet 34 is connected to the first port 42 of the motor 4, and the hydraulic oil flows back to the oil tank from the second oil outlet 34.

[0036] High-speed descent of the winch: The oil tank 3 discharges oil from the first oil return port 31, and the hydraulic oil circuit is divided into three routes. One route of hydraulic oil enters the first cartridge valve 1 through the A end of the first cartridge valve 1, and flows to the second port 41 of the motor 4 through the B end of the first cartridge valve 1. Another route 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 oil outlet 33, thereby driving the motor 4 to rotate and descend at high speed. The third route of hydraulic oil flows to the control end 3511 of the first overflow valve 351. The first overflow valve 351 is opened, the first oil inlet 33 is connected to the first port 42 of the motor 4, and the hydraulic oil flows back to the oil tank from the first oil outlet 33.

Claims

1. A winch speed hydraulic control system, characterized in that: It includes a first cartridge valve and a second cartridge valve, wherein the A port of the first cartridge valve is connected to the first oil return port of the oil tank, the B port of the first cartridge valve is connected to the second port of the motor, the A port of the second cartridge valve is connected to the second oil return port of the oil tank, and the B end 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 oil outlet and the second oil outlet of the oil tank, the first oil outlet is also connected to the control end of the second cartridge valve, and the second oil outlet is also connected to the control end of the first cartridge valve; the first oil outlet of the oil tank is connected to the control end of the second cartridge valve, and the second oil outlet is connected to the control end of the first cartridge valve; the first oil return port is also connected to the control end of the second cartridge valve, and the second oil return port is also connected to the control end of the first cartridge valve; the hydraulic oil flow rate of the first cartridge valve is higher than the hydraulic oil flow rate of the second cartridge valve.

2. A winch speed hydraulic control system 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 oil return port, wherein the first port of the first shuttle valve is connected to the second oil 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. A winch speed hydraulic control system 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 oil return port, the first port of the second shuttle valve is connected to the first oil 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. A winch speed hydraulic control system according to claim 1, characterized in that: A first balancing valve is provided between the first oil outlet and the motor, the first balancing valve comprises a first overflow valve and a first check valve, the oil inlet end of the first overflow valve is connected to the first port of the motor, the oil outlet end of the first overflow valve is connected to the first oil outlet, the oil inlet end of the first check valve is connected to the first oil outlet, and the oil outlet end 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 oil return port.

5. The winch speed hydraulic control system according to claim 1, characterized in that: A second balancing valve is provided between the second oil outlet and the motor, the second balancing valve includes a second overflow valve and a second one-way valve, the oil inlet end of the second overflow valve is connected to the first port of the motor, the oil outlet end of the second overflow valve is connected to the second oil outlet, the oil inlet end of the second one-way valve is connected to the second oil outlet, and the oil outlet end of the second one-way valve is connected to the first port of the motor; the control end of the second overflow valve is connected to the second oil return port.

6. A winch speed hydraulic control system according to claim 3, characterized in that: A third shuttle valve is also provided between the first oil outlet and the second shuttle valve, wherein 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.

7. A winch speed hydraulic control system according to claim 2, characterized in that: A fourth shuttle valve is also provided between the second oil outlet and the first shuttle valve, wherein 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.

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

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