A winch hydraulic control system and control method thereof

Abstract

A winch hydraulic control system includes a hydraulic oil tank, a hydraulic pump, and an electric motor. The hydraulic pump's oil inlet is connected to the hydraulic oil tank, the electric motor is connected to the hydraulic pump, and the hydraulic pump's oil outlet is connected to both port P of the main reversing valve assembly and port P of the control valve assembly. Ports A and B of the main reversing valve assembly are connected to port A of the first shuttle valve, port A of the balancing valve assembly, and port B of the control valve assembly, respectively. Port X is connected to port B of the second solenoid reversing valve. Ports B and C of the first shuttle valve are connected to port B of the balancing valve assembly and port B of the second shuttle valve, respectively. A third pressure reducing valve is connected in parallel with the second solenoid valve. Port P of the second solenoid reversing valve is connected to port X of the control valve assembly, port A of the second shuttle valve, and port SP of the balancing valve assembly. Port C of the second shuttle valve is connected to the rod chamber of the brake. The brake is connected to the hydraulic motor, and the oil outlet of the control valve assembly is connected to the oil inlet of the balancing valve assembly. This design can maintain constant wire rope tension and stable operation.

Description

Technical Field

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

[0002] A winch is a lightweight lifting device that uses a drum to wind a wire rope or chain to lift or pull heavy objects. Due to its simple operation and high load capacity, winches are widely used in marine engineering, ships, coal mines, docks, mines, roads and bridges, and other fields. In marine environments, a hydraulic control system is usually used to control the rotation of a hydraulic motor, which then drives the winch to complete anchor dropping and lifting operations and other winch-related operations. Due to the influence of waves, ships are prone to up and down movement. When the ship's deck surface moves upward, driving the hoisted object upward, the tension in the wire rope decreases, causing the wire rope to slack, resulting in the hoisted object shaking. Conversely, when the ship's deck surface moves downward, the support force of the hoisted object decreases, and the tension in the wire rope increases, which can cause the wire rope to break, affecting the safety of personnel and equipment. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects and problems of the prior art in that the wire rope is unstable when the winch is in use, and to provide a winch hydraulic control system and a control method thereof that can maintain constant tension of the wire rope.

[0004] To achieve the above objectives, the technical solution of the present invention is:

[0005] A winch hydraulic control system includes a hydraulic oil tank, a hydraulic pump, and an electric motor. The oil inlet of the hydraulic pump is connected to the hydraulic oil tank, and the output end of the electric motor is connected to the input end of the hydraulic pump. The hydraulic control system also includes a main reversing valve group, a hydraulic motor, a control valve group, a balancing valve group, a brake, a second solenoid reversing valve, a third pressure reducing valve, a first shuttle valve, and a second shuttle valve. The oil outlet of the hydraulic pump is connected to the P port of the main reversing valve group and the P port of the control valve group. The A port of the main reversing valve group is connected to the A port of the first shuttle valve and the A port of the balancing valve group. The B port of the main reversing valve group is connected to the B port of the control valve group. The X port of the main reversing valve group is connected to the B port of the second solenoid reversing valve and the P port of the third pressure reducing valve. The B port and the C port of the first shuttle valve are respectively connected to the B port of the balancing valve group and the B port of the second shuttle valve, the A port of the third pressure reducing valve is connected to the SP port of the balancing valve group, the P port of the second solenoid reversing valve is connected to the X port of the control valve group, the A port of the second shuttle valve, and the SP port of the balancing valve group, the C port of the second shuttle valve is connected to the rod chamber of the brake, the brake is connected to the hydraulic motor, the B1 port and the external control oil port of the control valve group are respectively connected to the B port and the external control oil port of the balancing valve group, the two oil outlets of the balancing valve group are respectively connected to the A port and the B port of the hydraulic motor, and the hydraulic oil tank is connected to the return oil ports of the main reversing valve group, the control valve group, the balancing valve group, the second solenoid reversing valve, and the third pressure reducing valve.

[0006] The main reversing valve group includes a first relief valve, a first pressure reducing valve, a proportional directional valve and two proportional pressure reducing valves. The oil inlet of the first relief valve, the oil inlet of the first pressure reducing valve and the P port of the proportional directional valve are all connected to the P port of the main reversing valve group. The oil outlet of the first pressure reducing valve is connected to the X port of the main reversing valve group and the first oil inlet of the two proportional pressure reducing valves. The spring chamber of the first pressure reducing valve is connected to the L port of the main reversing valve group and the second oil inlet of the two proportional pressure reducing valves. The oil outlet of the first relief valve is connected to the T port of the proportional directional valve and the T port of the main reversing valve group. The spring chamber of the first relief valve is connected to the second oil inlet of the two proportional pressure reducing valves. The oil outlets of the two proportional pressure reducing valves are respectively connected to the two pilot control oil ports of the proportional directional valve. The A port and B port of the proportional directional valve are respectively connected to the A port and B port of the main reversing valve group.

[0007] The main reversing valve group also includes a main shuttle valve and a pressure differential compensator. The oil inlet of the pressure differential compensator is connected to the oil inlet of the main reversing valve group, the oil outlet of the pressure differential compensator is connected to the P port of the main reversing valve group, the A port and the B port of the proportional directional valve are respectively connected to the A port and the B port of the main shuttle valve, and the C port of the main shuttle valve is connected to the spring chamber of the pressure differential compensator.

[0008] The hydraulic control system also includes a variable valve group, a third shuttle valve, and a third solenoid reversing valve. The A port and B port of the third shuttle valve are respectively connected to the XA port and XB port of the main reversing valve group. The two pilot control oil ports of the proportional directional valve are connected to the XA port and XB port of the main reversing valve group. The C port of the third shuttle valve is connected to the P port of the third solenoid reversing valve. The A port of the third solenoid reversing valve is connected to the X port of the variable valve group. The A port and B port of the variable valve group are respectively connected to the two oil outlet ports of the balance valve group. The A port and B port of the hydraulic motor are respectively connected to the A port and B port of the variable valve group. The L port of the variable valve group is connected to the hydraulic oil tank. The variable valve group includes a variable cylinder, a pressure limiting valve, a first throttle valve and a variable valve. The end of the piston rod of the cylinder is connected to a connecting rod, which is L-shaped. The horizontal part of the connecting rod is connected to one end of the swash plate of the hydraulic motor, and the vertical part of the connecting rod is connected to the spring chamber of the variable valve. The rod chamber of the variable cylinder is connected to the A port and the B port of the hydraulic motor, and the rodless chamber of the variable cylinder is connected to the P port of the pressure limiting valve through the first throttle valve. The hydraulic control port of the pressure limiting valve is connected to the A port and the B port of the hydraulic motor, the A port of the pressure limiting valve is connected to the L port of the variable valve group, the B port of the pressure limiting valve is connected to the P port of the variable valve, the hydraulic control port of the variable valve is connected to the X port of the variable valve group, the B port of the variable valve is connected to the L port of the variable valve group, and the A port of the variable valve is connected to both the A port and the B port of the hydraulic motor.

[0009] The X1 port and X3 port of the control valve group are connected to the X1 port and X3 port of the balancing valve group. The control valve group includes a two-way cartridge valve and a hydraulically controlled reversing valve. The X port and P port of the hydraulically controlled reversing valve are both connected to the P port of the control valve group. The T port of the hydraulically controlled reversing valve is connected to the X port of the control valve group. The B port of the hydraulically controlled reversing valve is connected to the X3 port of the control valve group. The A port of the two-way cartridge valve is connected to the B1 port and P port of the control valve group. The B port of the two-way cartridge valve is connected to the B port and X1 port of the control valve group. The spring chamber of the hydraulically controlled reversing valve and the oil return port of the two-way cartridge valve are connected to the L port of the control valve group.

[0010] The control valve group also includes an accumulator, a first solenoid reversing valve, a second pressure reducing valve, and a second throttle valve. The oil inlet of the accumulator is connected to the P port of the control valve group through a one-way valve, the P port of the first solenoid reversing valve is connected to the oil outlet of the accumulator, the T port of the first solenoid reversing valve is connected to the L port of the control valve group, the A port of the first solenoid reversing valve is connected to the X port of the two-way cartridge valve, the X port of the hydraulically controlled reversing valve, and the P port of the hydraulically controlled reversing valve, the oil inlet of the second throttle valve is connected to the A port of the first solenoid reversing valve and the P port of the control valve group, the oil inlet of the second pressure reducing valve is connected to the oil outlet of the second throttle valve, the oil outlet of the second pressure reducing valve is connected to the B1 port of the control valve group, and the spring chamber of the second pressure reducing valve is connected to the L port of the control valve group.

[0011] The balancing valve group includes a balancing valve, a second relief valve, and a hydraulically controlled ball valve. The oil inlet of the balancing valve is connected to the A port of the balancing valve group, the hydraulic control port of the balancing valve is connected to the X1 port of the balancing valve group, the oil outlet of the balancing valve is connected to the SP port and one oil outlet of the balancing valve group, the P port of the second relief valve is connected to the oil outlet of the balancing valve, the T port of the second relief valve is connected to the B port and another oil outlet of the balancing valve group, the X port of the second relief valve is connected to the A port of the hydraulically controlled ball valve, the hydraulic control port of the hydraulically controlled ball valve is connected to the X3 port of the balancing valve group, and the B port and the spring chamber of the hydraulically controlled ball valve are respectively connected to the two oil return ports of the balancing valve group.

[0012] The hydraulic control system also includes a proportional relief valve, the P port of the proportional relief valve is connected to the X4 port of the balancing valve group, the B port of the hydraulically controlled ball valve is connected to the X4 port of the balancing valve group, and the T port of the proportional relief valve is connected to the hydraulic oil tank.

[0013] A control method for a winch hydraulic control system, the control method comprising the following steps:

[0014] When the hoisted object moves upward along with the deck surface of the ship, the wire rope tends to relax, the output force of the hydraulic motor is greater than the force of the hoisted object, the hydraulic motor's A port absorbs oil and B port discharges oil, the DT of the second solenoid reversing valve is energized, the B port of the second solenoid reversing valve is connected to the P port, and the outlet pressure oil of the hydraulic pump is divided into three paths after passing through the X port of the main reversing valve group. The first path, after passing through the third pressure reducing valve and the third solenoid reversing valve, passes through the SP port of the balancing valve group and then replenishes oil to the A port of the hydraulic motor. The second path, after passing through the X port of the control valve group and the balancing valve group After the external control oil port is opened, the system switches to the constant tension mode. The third route flows into the rod chamber of the brake through the A port of the second shuttle valve and the C port of the second shuttle valve, and the brake is normally open; the pressure oil at the A port of the main reversing valve group is divided into two routes after passing through the balancing valve group. The first route is used to replenish the oil at the A port of the hydraulic motor; the second route is pressure-regulated by the balancing valve group, and then merges with the outlet oil at the B port of the hydraulic motor. It then flows through the B1 port of the control valve group, the B port of the control valve group, and the main reversing valve group in sequence and then returns to the hydraulic oil tank. The hydraulic motor actively retracts the rope and the wire rope is tensioned.

[0015] When the hoisted object moves downward with the deck of the ship, the wire rope tends to be tightened, the B port of the hydraulic motor absorbs oil and the A port discharges oil, the DT of the second solenoid reversing valve is energized, the B port of the second solenoid reversing valve is connected to the P port, and the outlet pressure oil of the hydraulic pump is divided into three paths after passing through the X port of the main reversing valve group. The first path, after passing through the third pressure reducing valve and the third solenoid reversing valve, passes through the SP port of the balancing valve group and then replenishes oil to the B port of the hydraulic motor. The second path, after passing through the X port of the control valve group and the external control oil port of the balancing valve group, the system switches In the constant tension mode, the third route flows into the rod chamber of the brake through the A port of the second shuttle valve and the C port of the second shuttle valve, and the brake is normally open; at the same time, the outlet pressure oil of the hydraulic pump passes through the P port, B1 port and B port of the control valve group in sequence to replenish the oil at the B port of the hydraulic motor. The excess replenishment flow passes through the B port of the control valve group and the main reversing valve group and then flows back to the hydraulic oil tank. The outlet oil of the A port of the hydraulic motor passes through the balancing valve group and then returns to the B port of the hydraulic motor. The hydraulic motor actively releases the rope and the wire rope is relaxed.

[0016] The control method further comprises the following steps:

[0017] When the suspended object does not move upward or downward with the deck surface of the ship,

[0018] When the DT of the main reversing valve group is energized, the main reversing valve group works in the right position, the P port of the main reversing valve group is connected with the A port, and the B port is connected with the T port. The outlet pressure oil of the hydraulic pump passes through the P port and the A port of the main reversing valve group in sequence and is divided into two paths. One path passes through the A port of the first shuttle valve, the C port of the first shuttle valve, the B port of the second shuttle valve, and the C port of the second shuttle valve and flows into the rod chamber of the brake, and the brake is opened; the other path passes through the A port of the balancing valve group and enters the A port of the hydraulic motor. The pressure oil of the B port of the hydraulic motor passes through the B port of the balancing valve group, the B1 port of the control valve group, the B port of the control valve group, the B port of the main reversing valve group, and the T port of the main reversing valve group in sequence and flows back to the hydraulic oil tank, and the hydraulic motor rotates forward to retract the rope;

[0019] When the DT of the main reversing valve group is energized, the main reversing valve group works in the left position, the P port of the main reversing valve group is connected with the B port, and the A port is connected with the T port. The outlet pressure oil of the hydraulic pump passes through the P port of the main reversing valve group, the B port of the main reversing valve group, the B port of the control valve group, and the B1 port of the control valve group and is divided into two paths. One path passes through the B port of the balancing valve group and enters the B port of the hydraulic motor, and the other path passes through the B port of the first shuttle valve, the C port of the first shuttle valve, the B port of the second shuttle valve, and the C port of the second shuttle valve in sequence and flows into the rod chamber of the brake, and the brake is opened; at the same time, the A port of the hydraulic motor passes through the A port of the balancing valve group, the A port of the main reversing valve group, and the T port of the main reversing valve group in sequence and flows back to the hydraulic oil tank, and the hydraulic motor reverses to release the rope.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In a winch hydraulic control system and control method of the present invention, a balancing valve group is provided at the two oil ports of the hydraulic motor to adjust the working pressure of the hydraulic motor. A main reversing valve group is provided to reverse and adjust the speed of the hydraulic motor to achieve rope reeling and unreeling. A third pressure reducing valve is provided to increase the system return oil back pressure, making the hydraulic motor operate more smoothly. When the second solenoid reversing valve loses power, the pressure oil of the main reversing valve group passes through the first shuttle valve and the second shuttle valve and enters the brake. The control port of the brake is at a higher pressure at ports A and B of the main reversing valve, and the brake opens and closes with the help of the main reversing valve. When the second solenoid reversing valve is energized, the outlet pressure oil of the main reversing valve is divided into three paths after passing through the second solenoid valve. The first path passes through the control valve group, which controls the balancing valve group to switch to constant tension mode, so that the wire rope always maintains a certain tension. The second path passes through the second shuttle valve and enters the brake control port, keeping the brake open. This prevents the system from repeatedly opening and closing the brake in constant tension mode, which causes hysteresis and abnormal wear. The third path passes through the balancing valve group to replenish oil to the hydraulic motor. The higher replenishment pressure helps prevent the hydraulic motor from sucking air when repeatedly dynamically retracting and releasing the rope in constant tension mode. Therefore, the present invention can maintain constant tension on the wire rope and ensure stable operation.

[0022] 2. In a winch hydraulic control system and control method according to the present invention, a main reversing valve assembly is provided with a first relief valve and a first pressure reducing valve. The first relief valve limits the maximum operating pressure of the proportional directional valve, while the first pressure reducing valve provides a stable oil source for the proportional pressure reducing valve. The proportional pressure reducing valve controls the opening size of the proportional directional valve; the greater the outlet pressure of the proportional pressure reducing valve, the larger the proportional directional valve opening. By providing a main shuttle valve and a pressure differential compensator, the main shuttle valve transmits the high-pressure side pressure of ports A and B of the proportional directional valve to the pressure differential compensator spring chamber, ensuring that the pressure differential between ports P and A or B of the proportional directional valve always equals the set value of the pressure differential compensator, ensuring that the inlet flow rate of the proportional directional valve is solely dependent on the opening size of the proportional directional valve. Therefore, the present invention has a rational design, high reliability, and stable operation.

[0023] 3. In a winch hydraulic control system and control method of the present invention, a variable valve assembly is provided. Under normal conditions, the hydraulic motor is at maximum displacement. At this time, the pressure-limiting valve and the variable valve operate in the right position, and the rodless chamber of the variable cylinder drains oil through the pressure-limiting valve and the variable valve, maintaining the hydraulic motor at maximum displacement. When the hydraulic motor's control oil pressure exceeds the spring force of the variable valve, the variable valve operates in the left position, and pressure oil from the hydraulic motor's oil port passes through the variable valve and the pressure-limiting valve and enters the rodless chamber of the variable cylinder, causing the variable lever piston rod to move left and reducing the hydraulic motor's displacement. The pressure-limiting valve is used to prevent overpressure in the hydraulic motor when in the low-displacement state. When the pressure at port A or B of the hydraulic motor reaches the set value of the pressure-limiting valve, the pressure-limiting valve spring force is overcome, causing the motor to operate in the left position. Oil in the rodless chamber of the variable cylinder drains directly and rapidly through the pressure-limiting valve without passing through the variable valve, thus protecting the hydraulic motor. A third shuttle valve is provided to provide a variable oil source for the hydraulic motor, and a third solenoid reversing valve is used to control the connection between the third shuttle valve and the hydraulic motor. Therefore, the present invention has a reasonable design, high reliability, and stable operation.

[0024] 4. In a winch hydraulic control system and control method of the present invention, an accumulator and a first solenoid reversing valve are provided. The accumulator is used to store pressure oil at the outlet of the hydraulic pump. When the first solenoid reversing valve loses power, the pressure oil is stored in the accumulator. When the hydraulic pump fails, the second solenoid reversing valve has no pressure oil at the outlet of the main reversing valve group. In this case, the accumulator can serve as an emergency oil source. When the first solenoid reversing valve is energized, the first solenoid valve obtains pressure oil from the accumulator, providing a three-way oil supply. The first route, after passing through the second pressure reducing valve and the second throttle valve, replenishes oil to port B of the hydraulic motor. After passing through the first shuttle valve and the second shuttle valve, it enters the control port of the brake, causing the brake to remain open. The second route enters port X of the hydraulically controlled reversing valve, driving it to reverse direction, from P to B. The emergency oil source enters the control port of the hydraulically controlled ball valve, causing it to reverse direction. The third path enters the control port of the pilot reversing valve of the two-way cartridge valve, pushing it to reverse direction, from P to A. The two-way cartridge valve self-locks from A to B, preventing the oil replenishing the hydraulic motor's B port from flowing out through the two-way cartridge valve. Only a small amount of emergency oil is required, and the system can still switch to constant tension mode for safe lowering. Therefore, the present invention has high reliability and stable operation.

[0025] 5. In the winch hydraulic control system and control method of the present invention, a second relief valve is provided to adjust the maximum operating pressure of the hydraulic motor; a balancing valve is provided to support the suspended object while the hydraulic motor is releasing the rope to prevent stalling; a hydraulically controlled ball valve is provided to switch the control oil source for the second relief valve control port; and a proportional relief valve is provided to remotely adjust the set pressure of the second relief valve when the system is in constant tension mode. Therefore, the present invention is rationally designed and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the hydraulic control system of the present invention.

[0027] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle main reversing valve group.

[0028] Figure 3 yes Figure 1 Schematic diagram of the structure of the medium variable valve group, hydraulic motor and brake.

[0029] Figure 4 yes Figure 1 Schematic diagram of the structure of the control valve group.

[0030] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle balancing valve group and proportional relief valve.

[0031] Figure 6 yes Figure 1 Schematic diagram of the structure of the second solenoid reversing valve, the third pressure reducing valve, the first shuttle valve, the second shuttle valve, the third solenoid reversing valve, and the third shuttle valve.

[0032] In the figure: hydraulic oil tank 1, electric motor 2, hydraulic pump 3, main reversing valve group 4, proportional directional valve 41, proportional pressure reducing valve 42, first relief valve 43, first pressure reducing valve 44, main shuttle valve 45, pressure differential compensator 46, control valve group 5, two-way cartridge valve 51, hydraulically controlled reversing valve 52, accumulator 53, first solenoid reversing valve 54, second pressure reducing valve 55, second throttle valve 56, balancing valve group 6, balancing valve 61, second relief valve 62, hydraulically controlled ball valve 63, variable valve group 7, variable cylinder 71, connecting rod 72, pressure limiting valve 73, variable valve 74, first throttle valve 75, hydraulic motor 8, second solenoid reversing valve 9, third pressure reducing valve 10, first shuttle valve 11, second shuttle valve 12, brake 13, third solenoid reversing valve 14, third shuttle valve 15, proportional relief valve 16, and one-way valve 17. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] See also Figures 1 to 6 A winch hydraulic control system includes a hydraulic oil tank 1, a hydraulic pump 3, and an electric motor 2. The oil inlet of the hydraulic pump 3 is connected to the hydraulic oil tank 1, and the output end of the electric motor 2 is connected to the input end of the hydraulic pump 3. The hydraulic control system also includes a main reversing valve group 4, a hydraulic motor 8, a control valve group 5, a balancing valve group 6, a brake 13, a second solenoid reversing valve 9, a third pressure reducing valve 10, a first shuttle valve 11, and a second shuttle valve 12. The oil outlet of the hydraulic pump 3 is connected to the P port of the main reversing valve group 4 and the P port of the control valve group 5. The A port of the main reversing valve group 4 is connected to the A port of the first shuttle valve 11 and the A port of the balancing valve group 6. The B port of the main reversing valve group 4 is connected to the B port of the control valve group 5. The X port of the main reversing valve group 4 is connected to the B port of the second solenoid reversing valve 9 and the P port of the third pressure reducing valve 10. The B port and C port of the first shuttle valve 11 are connected to the B port of the balancing valve group 6 and the B port of the second shuttle valve 12, respectively. The A port of the third pressure reducing valve 10 is connected to the SP port of the balancing valve group 6. The P port of the second solenoid reversing valve 9 is connected to the X port of the control valve group 5, the A port of the second shuttle valve 12, and the SP port of the balancing valve group 6. The C port of the second shuttle valve 12 is connected to the rod chamber of the brake 13. The brake 13 is connected to the hydraulic motor 8. The B1 port and the external control oil port of the control valve group 5 are connected to the B port and the external control oil port of the balancing valve group 6, respectively. The two oil outlets of the balancing valve group 6 are connected to the A port and the B port of the hydraulic motor 8, respectively. The hydraulic oil tank 1 is connected to the return oil ports of the main reversing valve group 4, the control valve group 5, the balancing valve group 6, the second solenoid reversing valve 9, and the third pressure reducing valve 10.

[0035] The main reversing valve group 4 includes a first relief valve 43, a first pressure reducing valve 44, a proportional directional valve 41 and two proportional pressure reducing valves 42. The oil inlet of the first relief valve 43, the oil inlet of the first pressure reducing valve 44 and the P port of the proportional directional valve 41 are all connected to the P port of the main reversing valve group 4. The oil outlet of the first pressure reducing valve 44 is connected to the X port of the main reversing valve group 4 and the first oil inlets of the two proportional pressure reducing valves 42. The spring chamber of the first pressure reducing valve 44 is connected to the L port of the main reversing valve group 4, the two The second oil inlet of the proportional pressure reducing valve 42 is connected, the oil outlet of the first relief valve 43 is connected with the T port of the proportional directional valve 41 and the T port of the main reversing valve group 4, the spring chamber of the first relief valve 43 is connected with the second oil inlets of the two proportional pressure reducing valves 42, the oil outlets of the two proportional pressure reducing valves 42 are respectively connected with the two pilot control oil ports of the proportional directional valve 41, and the A port and B port of the proportional directional valve 41 are respectively connected with the A port and B port of the main reversing valve group 4.

[0036] The main reversing valve group 4 also includes a main shuttle valve 45 and a pressure differential compensator 46. The oil inlet of the pressure differential compensator 46 is connected to the oil inlet of the main reversing valve group 4, and the oil outlet of the pressure differential compensator 46 is connected to the P port of the main reversing valve group 4. The A port and the B port of the proportional directional valve 41 are respectively connected to the A port and the B port of the main shuttle valve 45. The C port of the main shuttle valve 45 is connected to the spring chamber of the pressure differential compensator 46.

[0037] The hydraulic control system also includes a variable valve group 7, a third shuttle valve 15, and a third solenoid reversing valve 14. The A port and B port of the third shuttle valve 15 are respectively connected to the XA port and XB port of the main reversing valve group 4. The two pilot control oil ports of the proportional directional valve 41 are connected to the XA port and XB port of the main reversing valve group 4. The C port of the third shuttle valve 15 is connected to the P port of the third solenoid reversing valve 14. The A port of the third solenoid reversing valve 14 is connected to the X port of the variable valve group 7. The A port and B port of the variable valve group 7 are respectively connected to the two oil outlet ports of the balance valve group 6. The A port and B port of the hydraulic motor 8 are respectively connected to the A port and B port of the variable valve group 7. The L port of the variable valve group 7 is connected to the hydraulic oil tank 1. The variable valve group 7 includes a variable cylinder 71, a pressure limiting valve 73, a first throttle valve 75 and a variable valve 74. The variable cylinder 71 The end of the piston rod is connected to a connecting rod 72, which is L-shaped. The horizontal part of the connecting rod 72 is connected to one end of the swash plate of the hydraulic motor 8, and the vertical part of the connecting rod 72 is connected to the spring chamber of the variable valve 74. The rod chamber of the variable cylinder 71 is connected to the A port and the B port of the hydraulic motor 8, and the rodless chamber of the variable cylinder 71 is connected to the P port of the pressure limiting valve 73 through the first throttle valve 75. The hydraulic control port of the pressure limiting valve 73 is connected to the A port and the B port of the hydraulic motor 8, the A port of the pressure limiting valve 73 is connected to the L port of the variable valve group 7, the B port of the pressure limiting valve 73 is connected to the P port of the variable valve 74, the hydraulic control port of the variable valve 74 is connected to the X port of the variable valve group 7, the B port of the variable valve 74 is connected to the L port of the variable valve group 7, and the A port of the variable valve 74 is connected to both the A port and the B port of the hydraulic motor 8.

[0038] The X1 port and X3 port of the control valve group 5 are connected to the X1 port and X3 port of the balancing valve group 6. The control valve group 5 includes a two-way cartridge valve 51 and a hydraulically controlled reversing valve 52. The X port and P port of the hydraulically controlled reversing valve 52 are both connected to the P port of the control valve group 5. The T port of the hydraulically controlled reversing valve 52 is connected to the X port of the control valve group 5. The B port of the hydraulically controlled reversing valve 52 is connected to the X3 port of the control valve group 5. The A port of the two-way cartridge valve 51 is connected to the B1 port and P port of the control valve group 5. The B port of the two-way cartridge valve 51 is connected to the B port and X1 port of the control valve group 5. The spring chamber of the hydraulically controlled reversing valve 52 and the oil return port of the two-way cartridge valve 51 are connected to the L port of the control valve group 5.

[0039] The control valve group 5 also includes an accumulator 53, a first electromagnetic reversing valve 54, a second pressure reducing valve 55, and a second throttle valve 56. The oil inlet of the accumulator 53 is connected to the P port of the control valve group 5 through a one-way valve 17, the P port of the first electromagnetic reversing valve 54 is connected to the oil outlet of the accumulator 53, the T port of the first electromagnetic reversing valve 54 is connected to the L port of the control valve group 5, and the A port of the first electromagnetic reversing valve 54 is connected to the two-way cartridge valve 51. The X port of the hydraulically controlled reversing valve 52, the X port of the hydraulically controlled reversing valve 52, and the P port of the hydraulically controlled reversing valve 52 are all connected, the oil inlet of the second throttle valve 56 is connected with the A port of the first solenoid reversing valve 54 and the P port of the control valve group 5, the oil inlet of the second pressure reducing valve 55 is connected with the oil outlet of the second throttle valve 56, the oil outlet of the second pressure reducing valve 55 is connected with the B1 port of the control valve group 5, and the spring chamber of the second pressure reducing valve 55 is connected with the L port of the control valve group 5.

[0040] The balancing valve group 6 includes a balancing valve 61, a second relief valve 62, and a hydraulically controlled ball valve 63. The oil inlet of the balancing valve 61 is connected to the A port of the balancing valve group 6, the hydraulically controlled port of the balancing valve 61 is connected to the X1 port of the balancing valve group 6, the oil outlet of the balancing valve 61 is connected to the SP port and one oil outlet of the balancing valve group 6, the P port of the second relief valve 62 is connected to the oil outlet of the balancing valve 61, the T port of the second relief valve 62 is connected to the B port and another oil outlet of the balancing valve group 6, the X port of the second relief valve 62 is connected to the A port of the hydraulically controlled ball valve 63, the hydraulically controlled port of the hydraulically controlled ball valve 63 is connected to the X3 port of the balancing valve group 6, and the B port and the spring chamber of the hydraulically controlled ball valve 63 are respectively connected to the two oil return ports of the balancing valve group 6.

[0041] The hydraulic control system also includes a proportional relief valve 16, the P port of the proportional relief valve 16 is connected to the X4 port of the balancing valve group 6, the B port of the hydraulic control ball valve 63 is connected to the X4 port of the balancing valve group 6, and the T port of the proportional relief valve 16 is connected to the hydraulic oil tank 1.

[0042] A control method for a winch hydraulic control system, the control method comprising the following steps:

[0043] When the suspended object moves upward along with the deck surface of the ship, the wire rope tends to loosen, and the output force of the hydraulic motor 8 is greater than the force of the suspended object. The A port of the hydraulic motor 8 sucks oil and the B port discharges oil. The DT3 of the second electromagnetic reversing valve 9 is energized, and the B port of the second electromagnetic reversing valve 9 is connected to the P port. The outlet pressure oil of the hydraulic pump 3 is divided into three paths after passing through the X port of the main reversing valve group 4. The first path, after passing through the third pressure reducing valve 10 and the third electromagnetic reversing valve 9, passes through the SP port of the balancing valve group 6 to replenish oil to the A port of the hydraulic motor 8. The second path, after passing through the X port of the control valve group 5 and the external port of the balancing valve group 6, is After the oil control port, the system switches to constant tension mode. The third route flows through the A port of the second shuttle valve 12 and the C port of the second shuttle valve 12 into the rod chamber of the brake 13, and the brake 13 is normally open; the pressure oil at the A port of the main reversing valve group 4 is divided into two routes after passing through the balancing valve group 6. The first route is used to replenish oil at the A port of the hydraulic motor 8; the second route is pressure-regulated by the balancing valve group 6, and then merges with the outlet oil of the B port of the hydraulic motor 8. After that, it passes through the B1 port of the control valve group 5, the B port of the control valve group 5, and the main reversing valve group 4 in sequence and then flows back to the hydraulic oil tank 1. The hydraulic motor 8 actively retracts the rope and the wire rope is tensioned.

[0044] When the hoisted object moves downward along with the deck surface of the ship, the wire rope tends to be tightened, the B port of the hydraulic motor 8 absorbs oil and the A port discharges oil, DT3 of the second solenoid reversing valve 9 is energized, the B port of the second solenoid reversing valve 9 is connected to the P port, and the outlet pressure oil of the hydraulic pump 3 is divided into three paths after passing through the X port of the main reversing valve group 4. The first path, after passing through the third pressure reducing valve 10 and the third solenoid reversing valve 9, passes through the SP port of the balancing valve group 6 to replenish oil to the B port of the hydraulic motor 8. The second path, after passing through the X port of the control valve group 5 and the external control oil port of the balancing valve group 6, the system switches to constant tension In force mode, the third route flows through the A port of the second shuttle valve 12 and the C port of the second shuttle valve 12 into the rod chamber of the brake 13, and the brake 13 is normally open; at the same time, the outlet pressure oil of the hydraulic pump 3 passes through the P port and the B1 port of the control valve group 5 and the B port of the balancing valve group 6 in sequence to replenish the oil at the B port of the hydraulic motor 8, and the excess replenishing oil flow passes through the B port of the control valve group 5 and the main reversing valve group 4 and then flows back to the hydraulic oil tank 1. The outlet oil at the A port of the hydraulic motor 8 passes through the balancing valve group 6 and then returns to the B port of the hydraulic motor 8. The hydraulic motor 8 actively releases the rope and the wire rope is relaxed.

[0045] The control method further comprises the following steps:

[0046] DT1 of the main reversing valve group 4 is energized, the main reversing valve group 4 works in the right position, the P port of the main reversing valve group 4 is connected with the A port, and the B port is connected with the T port. The outlet pressure oil of the hydraulic pump 3 passes through the P port and the A port of the main reversing valve group 4 in sequence and is divided into two paths. One path passes through the A port of the first shuttle valve 11, the C port of the first shuttle valve 11, the B port of the second shuttle valve 12, and the C port of the second shuttle valve 12 and then flows into the rod chamber of the brake 13, and the brake 13 is opened; the other path passes through the A port of the balancing valve group 6 and then enters the A port of the hydraulic motor 8. The pressure oil of the B port of the hydraulic motor 8 passes through the B port of the balancing valve group 6, the B1 port of the control valve group 5, the B port of the control valve group 5, the B port of the main reversing valve group 4, and the T port of the main reversing valve group 4 in sequence and then flows back to the hydraulic oil tank 1, and the hydraulic motor 8 rotates forward to retract the rope;

[0047] DT2 of the main reversing valve group 4 is energized, the main reversing valve group 4 works in the left position, the P port of the main reversing valve group 4 is connected to the B port, and the A port is connected to the T port. The outlet pressure oil of the hydraulic pump 3 passes through the P port of the main reversing valve group 4, the B port of the main reversing valve group 4, the B port of the control valve group 5, and the B1 port of the control valve group 5 and is divided into two paths. One path passes through the B port of the balancing valve group 6 and enters the B port of the hydraulic motor 8, and the other path passes through the B port of the first shuttle valve 11, the C port of the first shuttle valve 11, the B port of the second shuttle valve 12, and the C port of the second shuttle valve 12 in sequence and flows into the rod chamber of the brake 13, and the brake 13 is opened; at the same time, the A port of the hydraulic motor 8 passes through the A port of the balancing valve group 6, the A port of the main reversing valve group 4, and the T port of the main reversing valve group 4 in sequence and flows back to the hydraulic oil tank 1, and the hydraulic motor 8 reverses to release the rope.

[0048] The principle of the present invention is described as follows:

[0049] In the present invention, the hydraulic pump 3 is a constant pressure variable pump, which provides a stable high-pressure oil source for the system. The pressure oil at the T port of the main reversing valve group 4 is returned to the hydraulic oil tank 1 through the one-way valve 17. The SP port of the balancing valve group 6 is provided with a one-way valve 17. A one-way valve 17 is provided between the first solenoid reversing valve 54 and the second throttle valve 56. A one-way valve 17 is provided between the second throttle valve 56 and the P port of the control valve group 5. A one-way valve 17 is provided between the second pressure reducing valve 55 and the B1 port of the control valve group 5. By providing multiple one-way valves 17, the reverse flow of pressure oil is prevented. L in the hydraulic control system represents the oil port for the leaked oil in the valve group to be separately led back to the oil tank, T represents the return oil port of the working oil circuit, X represents the external control oil port or remote control port, and A, B, and C ports represent the working oil Since the installation position of the hydraulic motor 8 is higher than the hydraulic oil tank 1, there is leakage of oil at the A and B ports of the hydraulic motor 8 after a long period of shutdown, and there is air in the pipeline. In order to prevent the hydraulic motor 8 from being damaged by air suction, after the hydraulic pump 3 is started, before the proportional directional valve 41 is switched, the hydraulic pump 3 is started, and the outlet pressure oil of the hydraulic pump 3 is divided into two paths. One path passes through the control valve group 5 and the balancing valve group 6 in sequence and enters the B port of the hydraulic motor 8 to discharge the air, and the pressure oil fills the B port of the hydraulic motor 8 and the connecting pipeline; the other path passes through the main reversing valve group 4, the third reducing valve 10, and the balancing valve group 6 in sequence and enters the A port of the hydraulic motor 8 to replenish oil for the A port of the hydraulic motor 8; at the same time, the outlet pressure oil of the hydraulic pump 3 passes through the one-way valve 17 and stores the emergency oil source in the accumulator 53.

[0050] Example 1:

[0051] See also Figures 1 to 6A winch hydraulic control system includes a hydraulic oil tank 1, a hydraulic pump 3, and an electric motor 2. The oil inlet of the hydraulic pump 3 is connected to the hydraulic oil tank 1, and the output end of the electric motor 2 is connected to the input end of the hydraulic pump 3. The hydraulic control system also includes a main reversing valve group 4, a hydraulic motor 8, a control valve group 5, a balancing valve group 6, a brake 13, a second solenoid reversing valve 9, a third pressure reducing valve 10, a first shuttle valve 11, and a second shuttle valve 12. The oil outlet of the hydraulic pump 3 is connected to the P port of the main reversing valve group 4 and the P port of the control valve group 5. The A port of the main reversing valve group 4 is connected to the A port of the first shuttle valve 11 and the A port of the balancing valve group 6. The B port of the main reversing valve group 4 is connected to the B port of the control valve group 5. The X port of the main reversing valve group 4 is connected to the B port of the second solenoid reversing valve 9 and the P port of the third pressure reducing valve 10. The B port and C port of the first shuttle valve 11 are connected to the B port of the balancing valve group 6 and the B port of the second shuttle valve 12, respectively. The A port of the third pressure reducing valve 10 is connected to the SP port of the balancing valve group 6. The P port of the second solenoid reversing valve 9 is connected to the X port of the control valve group 5, the A port of the second shuttle valve 12, and the SP port of the balancing valve group 6. The C port of the second shuttle valve 12 is connected to the rod chamber of the brake 13. The brake 13 is connected to the hydraulic motor 8. The B1 port and the external control oil port of the control valve group 5 are connected to the B port and the external control oil port of the balancing valve group 6, respectively. The two oil outlets of the balancing valve group 6 are connected to the A port and the B port of the hydraulic motor 8, respectively. The hydraulic oil tank 1 is connected to the return oil ports of the main reversing valve group 4, the control valve group 5, the balancing valve group 6, the second solenoid reversing valve 9, and the third pressure reducing valve 10.

[0052] The main reversing valve group 4 includes a first relief valve 43, a first pressure reducing valve 44, a proportional directional valve 41 and two proportional pressure reducing valves 42. The oil inlet of the first relief valve 43, the oil inlet of the first pressure reducing valve 44 and the P port of the proportional directional valve 41 are all connected to the P port of the main reversing valve group 4. The oil outlet of the first pressure reducing valve 44 is connected to the X port of the main reversing valve group 4 and the first oil inlets of the two proportional pressure reducing valves 42. The spring chamber of the first pressure reducing valve 44 is connected to the L port of the main reversing valve group 4, the two The second oil inlet of the proportional pressure reducing valve 42 is connected, the oil outlet of the first relief valve 43 is connected with the T port of the proportional directional valve 41 and the T port of the main reversing valve group 4, the spring chamber of the first relief valve 43 is connected with the second oil inlets of the two proportional pressure reducing valves 42, the oil outlets of the two proportional pressure reducing valves 42 are respectively connected with the two pilot control oil ports of the proportional directional valve 41, and the A port and B port of the proportional directional valve 41 are respectively connected with the A port and B port of the main reversing valve group 4.

[0053] The main reversing valve group 4 also includes a main shuttle valve 45 and a pressure differential compensator 46. The oil inlet of the pressure differential compensator 46 is connected to the oil inlet of the main reversing valve group 4, and the oil outlet of the pressure differential compensator 46 is connected to the P port of the main reversing valve group 4. The A port and the B port of the proportional directional valve 41 are respectively connected to the A port and the B port of the main shuttle valve 45. The C port of the main shuttle valve 45 is connected to the spring chamber of the pressure differential compensator 46.

[0054] The X1 port and X3 port of the control valve group 5 are connected to the X1 port and X3 port of the balancing valve group 6. The control valve group 5 includes a two-way cartridge valve 51 and a hydraulically controlled reversing valve 52. The X port and P port of the hydraulically controlled reversing valve 52 are both connected to the P port of the control valve group 5. The T port of the hydraulically controlled reversing valve 52 is connected to the X port of the control valve group 5. The B port of the hydraulically controlled reversing valve 52 is connected to the X3 port of the control valve group 5. The A port of the two-way cartridge valve 51 is connected to the B1 port and P port of the control valve group 5. The B port of the two-way cartridge valve 51 is connected to the B port and X1 port of the control valve group 5. The spring chamber of the hydraulically controlled reversing valve 52 and the oil return port of the two-way cartridge valve 51 are connected to the L port of the control valve group 5.

[0055] The balancing valve group 6 includes a balancing valve 61, a second relief valve 62, and a hydraulically controlled ball valve 63. The oil inlet of the balancing valve 61 is connected to the A port of the balancing valve group 6, the hydraulically controlled port of the balancing valve 61 is connected to the X1 port of the balancing valve group 6, the oil outlet of the balancing valve 61 is connected to the SP port and one oil outlet of the balancing valve group 6, the P port of the second relief valve 62 is connected to the oil outlet of the balancing valve 61, the T port of the second relief valve 62 is connected to the B port and another oil outlet of the balancing valve group 6, the X port of the second relief valve 62 is connected to the A port of the hydraulically controlled ball valve 63, the hydraulically controlled port of the hydraulically controlled ball valve 63 is connected to the X3 port of the balancing valve group 6, and the B port and the spring chamber of the hydraulically controlled ball valve 63 are respectively connected to the two oil return ports of the balancing valve group 6. The hydraulic control system also includes a proportional relief valve 16, the P port of the proportional relief valve 16 is connected to the X4 port of the balancing valve group 6, the B port of the hydraulic control ball valve 63 is connected to the X4 port of the balancing valve group 6, and the T port of the proportional relief valve 16 is connected to the hydraulic oil tank 1.

[0056] A control method for a winch hydraulic control system, the specific steps of the control method are:

[0057] DT1 of the proportional pressure reducing valve 42 is energized, and the proportional directional valve 41 works in the right position. The P port of the proportional directional valve 41 is connected to the A port, and the B port is connected to the T port. The outlet pressure oil of the hydraulic pump 3 passes through the P port and the A port of the proportional directional valve 41 in sequence and is divided into two paths. One path passes through the A port of the first shuttle valve 11, the C port of the first shuttle valve 11, the B port of the second shuttle valve 12, and the C port of the second shuttle valve 12 and then flows into the rod chamber of the brake 13, and the brake 13 is opened; the other path passes through the balance valve 61 and then enters the A port of the hydraulic motor 8. The pressure oil of the B port of the hydraulic motor 8 passes through the A port of the two-way cartridge valve 51, the B port of the two-way cartridge valve 51, the B port of the proportional directional valve 41, and the T port of the proportional directional valve 41 in sequence and then flows back to the hydraulic oil tank 1, and the hydraulic motor 8 rotates forward to retract the rope;

[0058] DT2 of the proportional pressure reducing valve 42 is energized, and the proportional directional valve 41 works in the left position. The P port of the proportional directional valve 41 is connected to the B port, and the A port is connected to the T port. The outlet pressure oil of the hydraulic pump 3 passes through the P port of the proportional directional valve 41, the B port of the proportional directional valve 41, the B port of the two-way cartridge valve 51, and the A port of the two-way cartridge valve 51, and is divided into two paths. One path enters the B port of the hydraulic motor 8, and the other path passes through the B port of the first shuttle valve 11, the C port of the first shuttle valve 11, the B port of the second shuttle valve 12, and the C port of the second shuttle valve 12 in sequence and flows into the rod chamber of the brake 13, and the brake 13 is opened; at the same time, the other path enters the control port of the balance valve 61, and the balance valve 61 is opened. The A port of the hydraulic motor 8 passes through the balance valve 61, the A port of the proportional directional valve 41, and the T port of the proportional directional valve 41 and flows back to the hydraulic oil tank 1, and the hydraulic motor 8 reverses to release the rope;

[0059] When the suspended object moves upward along with the deck surface of the ship, the wire rope tends to loosen, and the output force of the hydraulic motor 8 is greater than the force of the suspended object. The A port of the hydraulic motor 8 sucks oil and the B port discharges oil. The DT3 of the second electromagnetic reversing valve 9 is energized, and the B port of the second electromagnetic reversing valve 9 is connected to the P port. The outlet pressure oil of the hydraulic pump 3 is divided into three paths after passing through the third pressure reducing valve 10 and the second electromagnetic reversing valve 9. The first path, after passing through the one-way valve 17, replenishes oil to the A port of the hydraulic motor 8; the second path, after passing through the hydraulically controlled reversing valve 52, enters the control port of the hydraulically controlled ball valve 63, so that the hydraulically controlled ball valve 63 is reversed, and the system switches to the constant tension mode; the third path passes through the A port of the second shuttle valve 12 and the third reversing valve 9. After the C port of the second shuttle valve 12, the pressure flows into the rod chamber of the brake 13, and the brake 13 is normally open; at the same time, DT4 of the proportional relief valve 16 is energized to adjust the set pressure of the second relief valve 62. After the setting is completed, DT3 loses power; the pressure oil at the A port of the proportional directional valve 41 is divided into two paths after passing through the balance valve 61. The first path is used to replenish the oil at the A port of the hydraulic motor 8; the second path is pressure-regulated by the second relief valve 62, and then merges with the outlet oil at the B port of the hydraulic motor 8. After that, it passes through the A port of the two-way cartridge valve, the B port of the two-way cartridge valve, the B port of the proportional directional valve 41, and the T port of the proportional directional valve 41 and then flows back to the hydraulic oil tank 1. The hydraulic motor 8 actively retracts the rope and the wire rope is tensioned.

[0060] When the hoisted object moves downward along the deck surface of the ship, the wire rope tends to be tightened, the B port of the hydraulic motor 8 absorbs oil and the A port discharges oil, DT3 of the second solenoid reversing valve 9 is energized, the B port of the second solenoid reversing valve 9 is connected to the P port, and the outlet pressure oil of the hydraulic pump 3 is divided into three paths after passing through the X port of the main reversing valve group 4. The first path passes through the third reducing valve 10 and the third solenoid reversing valve 9, and then passes through the second overflow valve 62 to replenish oil to the B port of the hydraulic motor 8. The second path passes through the hydraulically controlled reversing valve 52 and enters the control port of the hydraulically controlled ball valve 63, so that the hydraulically controlled ball valve 63 is reversed, and the system switches to constant tension mode. The oil flows through the A port of the second shuttle valve 12 and the C port of the second shuttle valve 12 into the rod chamber of the brake 13, and the brake 13 is normally open. At the same time, the outlet pressure oil of the hydraulic pump 3 passes through the second throttle valve 56 and the second reducing valve 55 in sequence to replenish oil for the B port of the hydraulic motor 8. The excess replenishing oil flow passes through the A port of the two-way cartridge valve, the B port of the two-way cartridge valve, the B port of the proportional directional valve 41, and the T port of the proportional directional valve 41 and then flows back to the hydraulic oil tank 1. The outlet oil of the A port of the hydraulic motor 8 passes through the second overflow valve 62 and then returns to the B port of the hydraulic motor 8. The hydraulic motor 8 actively releases the rope and the wire rope is relaxed.

[0061] Example 2:

[0062] The basic content is the same as Example 1, except that:

[0063] See also Figure 3The hydraulic control system also includes a variable valve group 7, a third shuttle valve 15, and a third solenoid reversing valve 14. Port A and port B of the third shuttle valve 15 are respectively connected to port XA and port XB of the main reversing valve group 4. The two pilot control oil ports of the proportional directional valve 41 are connected to port XA and port XB of the main reversing valve group 4. Port C of the third shuttle valve 15 is connected to port P of the third solenoid reversing valve 14. Port A of the third solenoid reversing valve 14 is connected to port X of the variable valve group 7. Port A and port B of the variable valve group 7 are respectively connected to the two oil outlets of the balancing valve group 6. Port A and port B of the hydraulic motor 8 are respectively connected to port A and port B of the variable valve group 7. The return oil port of the variable valve group 7 is connected to the hydraulic oil tank 1. The variable valve group 7 includes a variable cylinder 71, a pressure limiting valve 73, a first throttle valve 75 and a variable valve 74. The variable cylinder 71 The end of the piston rod is connected to a connecting rod 72, which is L-shaped. The horizontal part of the connecting rod 72 is connected to one end of the swash plate of the hydraulic motor 8, and the vertical part of the connecting rod 72 is connected to the spring chamber of the variable valve 74. The rod chamber of the variable cylinder 71 is connected to the A port and the B port of the hydraulic motor 8, and the rodless chamber of the variable cylinder 71 is connected to the P port of the pressure limiting valve 73 through the first throttle valve 75. The hydraulic control port of the pressure limiting valve 73 is connected to the A port and the B port of the hydraulic motor 8, the A port of the pressure limiting valve 73 is connected to the return oil port of the variable valve group 7, the B port of the pressure limiting valve 73 is connected to the P port of the variable valve 74, the hydraulic control port of the variable valve 74 is connected to the X port of the variable valve group 7, the B port of the variable valve 74 is connected to the return oil port of the variable valve group 7, and the A port of the variable valve 74 is connected to both oil ports of the hydraulic motor 8.

[0064] DT5 of the third solenoid reversing valve 14 is energized, connecting port P with port A. The pressure oil of the proportional pressure reducing valve 42 enters the variable valve 74 after passing through the third shuttle valve 15. When the control oil pressure is greater than the spring force of the variable valve 74, the variable valve 74 operates in the left position, and port P is connected to port A. The pressure oil of port A or port B of the hydraulic motor 8 passes through port A and port P of the variable valve 74, and port B and port P of the pressure limiting valve 73, and then enters the rodless chamber of the variable cylinder 71, causing the piston rod of the variable lever 71 to move left, reducing the displacement of the hydraulic motor 8. When the pressure of port A or port B of the hydraulic motor 8 reaches the set value of the pressure limiting valve 73, it overcomes the spring force of the pressure limiting valve 73 and causes it to operate in the left position. Port A of the pressure limiting valve 73 is connected to port P, and the oil in the rodless chamber of the variable cylinder 71 is discharged after passing through the first throttle valve 75 and the pressure limiting valve 73.

[0065] Example 3:

[0066] The basic content is the same as Example 1, except that:

[0067] See also Figure 4The control valve group 5 also includes an accumulator 53, a first solenoid reversing valve 54, a second pressure reducing valve 55, and a second throttle valve 56. The oil inlet of the accumulator 53 is connected to the P port of the control valve group 5 via a one-way valve 17. The P port of the first solenoid reversing valve 54 is connected to the oil outlet of the accumulator 53. The T port of the first solenoid valve is connected to the oil return port of the control valve group 5. The A port of the first solenoid reversing valve 54 is connected to the X port of the two-way cartridge valve 51, the X port of the hydraulically controlled reversing valve 52, the P port of the hydraulically controlled reversing valve 52, and the B port of the control valve group 5. The A port of the first solenoid reversing valve 54 is connected to the B port of the control valve group 5 after passing through the second throttle valve 56 and the second pressure reducing valve 55. The spring chamber of the first pressure reducing valve 44 is connected to the L port of the control valve group 5.

[0068] The control method also includes an emergency mode. In the emergency mode, the hydraulic pump 3 fails, DT6 of the first electromagnetic reversing valve 54 is energized, the P port is connected to the A port, and the pressure oil of the accumulator 53 is divided into three oil supply routes after passing through the first electromagnetic reversing valve 54. The first route, the second throttle valve 56, and the second pressure reducing valve 55 supply oil to the hydraulic motor 8. At the same time, the oil passes through the B port and the C port of the first shuttle valve 11 and the B port and the C port of the second shuttle valve 12 and enters the control port of the brake 13, so that the brake The actuator 13 is normally open; the second path pushes the reversal through the X port of the hydraulically controlled reversing valve 52, so that the P port is connected to the B port, and the pressure oil passes through the P port and the B port of the hydraulically controlled reversing valve 52 and enters the hydraulically controlled ball valve 63 to reverse it, so that the system maintains the constant tension mode; the third path passes through the control port X of the pilot reversing valve of the two-way cartridge valve 51, pushes its reversal, and the A port of the pilot reversing valve is connected to the P port, and the pressure oil passes through the A port of the two-way cartridge valve 51 to replenish oil to the B port of the hydraulic motor 8.

Claims

1. A winch hydraulic control system, comprising a hydraulic oil tank (1), a hydraulic pump (3), and an electric motor (2), wherein the oil inlet of the hydraulic pump (3) is connected to the hydraulic oil tank (1), and the output end of the electric motor (2) is connected to the input end of the hydraulic pump (3), characterized in that: The hydraulic control system further comprises a main reversing valve group (4), a hydraulic motor (8), a control valve group (5), a balancing valve group (6), a brake (13), a second electromagnetic reversing valve (9), a third pressure reducing valve (10), a first shuttle valve (11), and a second shuttle valve (12). The oil outlet of the hydraulic pump (3) is connected to the P port of the main reversing valve group (4) and the P port of the control valve group (5). The A port of the main reversing valve group (4) is connected to the A port of the first shuttle valve (11) and the A port of the balancing valve group (6). The B port of the main reversing valve group (4) is connected to the B port of the control valve group (5). The X port of the main reversing valve group (4) is connected to the B port of the second electromagnetic reversing valve (9) and the P port of the third pressure reducing valve (10). The B port and the C port of the first shuttle valve (11) are respectively connected to the B port of the balancing valve group (6) and the second shuttle valve (12). The B port of the control valve group (5) is connected, the A port of the third pressure reducing valve (10) is connected to the SP port of the balancing valve group (6), the P port of the second electromagnetic reversing valve (9) is connected to the X port of the control valve group (5), the A port of the second shuttle valve (12), and the SP port of the balancing valve group (6), the C port of the second shuttle valve (12) is connected to the rod chamber of the brake (13), the brake (13) is connected to the hydraulic motor (8), the B1 port and the external control oil port of the control valve group (5) are respectively connected to the B port and the external control oil port of the balancing valve group (6), the two oil outlets of the balancing valve group (6) are respectively connected to the A port and the B port of the hydraulic motor (8), and the hydraulic oil tank (1) is connected to the return oil ports of the main reversing valve group (4), the control valve group (5), the balancing valve group (6), the second electromagnetic reversing valve (9), and the third pressure reducing valve (10); The X1 port and the X3 port of the control valve group (5) are connected to the X1 port and the X3 port of the balancing valve group (6). The control valve group (5) includes a two-way cartridge valve (51) and a hydraulically controlled reversing valve (52). The X port and the P port of the hydraulically controlled reversing valve (52) are both connected to the P port of the control valve group (5). The T port of the hydraulically controlled reversing valve (52) is connected to the X port of the control valve group (5). The B port of (52) is connected to the X3 port of the control valve group (5), the A port of the two-way cartridge valve (51) is connected to the B1 port and the P port of the control valve group (5), the B port of the two-way cartridge valve (51) is connected to the B port and the X1 port of the control valve group (5), and the spring chamber of the hydraulically controlled reversing valve (52) and the oil return port of the two-way cartridge valve (51) are connected to the L port of the control valve group (5); The control valve group (5) further comprises an accumulator (53), a first electromagnetic reversing valve (54), a second pressure reducing valve (55), and a second throttle valve (56). The oil inlet of the accumulator (53) is connected to the P port of the control valve group (5) through a one-way valve (17). The P port of the first electromagnetic reversing valve (54) is connected to the oil outlet of the accumulator (53). The T port of the first electromagnetic reversing valve (54) is connected to the L port of the control valve group (5). The A port of the first electromagnetic reversing valve (54) is connected to the The X port of the hydraulically controlled reversing valve (51), the X port of the hydraulically controlled reversing valve (52), and the P port of the hydraulically controlled reversing valve (52) are all connected; the oil inlet of the second throttle valve (56) is connected to the A port of the first electromagnetic reversing valve (54) and the P port of the control valve group (5); the oil inlet of the second pressure reducing valve (55) is connected to the oil outlet of the second throttle valve (56); the oil outlet of the second pressure reducing valve (55) is connected to the B1 port of the control valve group (5); and the spring chamber of the second pressure reducing valve (55) is connected to the L port of the control valve group (5).

2. A winch hydraulic control system according to claim 1, characterized in that: The main reversing valve group (4) comprises a first overflow valve (43), a first pressure reducing valve (44), a proportional directional valve (41) and two proportional pressure reducing valves (42); the oil inlet of the first overflow valve (43), the oil inlet of the first pressure reducing valve (44) and the P port of the proportional directional valve (41) are all connected to the P port of the main reversing valve group (4); the oil outlet of the first pressure reducing valve (44) is connected to the X port of the main reversing valve group (4) and the first oil inlets of the two proportional pressure reducing valves (42); the spring chamber of the first pressure reducing valve (44) is connected to the L port of the main reversing valve group (4). The oil outlet of the first relief valve (43) is connected to the T port of the proportional directional valve (41) and the T port of the main reversing valve group (4); the spring chamber of the first relief valve (43) is connected to the second oil inlets of the two proportional pressure reducing valves (42); the oil outlets of the two proportional pressure reducing valves (42) are respectively connected to the two pilot control oil ports of the proportional directional valve (41); the A port and the B port of the proportional directional valve (41) are respectively connected to the A port and the B port of the main reversing valve group (4).

3. A winch hydraulic control system according to claim 2, characterized in that: The main reversing valve group (4) further comprises a main shuttle valve (45) and a pressure differential compensator (46). The oil inlet of the pressure differential compensator (46) is connected to the oil inlet of the main reversing valve group (4), the oil outlet of the pressure differential compensator (46) is connected to the P port of the main reversing valve group (4), the A port and the B port of the proportional directional valve (41) are respectively connected to the A port and the B port of the main shuttle valve (45), and the C port of the main shuttle valve (45) is connected to the spring chamber of the pressure differential compensator (46).

4. A winch hydraulic control system according to claim 2, characterized in that: The hydraulic control system further comprises a variable valve group (7), a third shuttle valve (15), and a third electromagnetic reversing valve (14); the A port and the B port of the third shuttle valve (15) are respectively connected to the XA port and the XB port of the main reversing valve group (4); the two pilot control oil ports of the proportional directional valve (41) are connected to the XA port and the XB port of the main reversing valve group (4); the C port of the third shuttle valve (15) is connected to the P port of the third electromagnetic reversing valve (14); the A port of the third electromagnetic reversing valve (14) is connected to the XA port and the XB port of the main reversing valve group (4); The port is connected to the X port of the variable valve group (7), the A port and the B port of the variable valve group (7) are respectively connected to the two oil outlets of the balance valve group (6), the A port and the B port of the hydraulic motor (8) are respectively connected to the A port and the B port of the variable valve group (7), the L port of the variable valve group (7) is connected to the hydraulic oil tank (1), the variable valve group (7) includes a variable cylinder (71), a pressure limiting valve (73), a first throttle valve (75) and a variable valve (74), the variable cylinder (71) The end of the piston rod is connected to a connecting rod (72), and the connecting rod (72) is L-shaped. The horizontal portion of the connecting rod (72) is connected to one end of the swash plate of the hydraulic motor (8), and the vertical portion of the connecting rod (72) is connected to the spring chamber of the variable valve (74). The rod chamber of the variable cylinder (71) is connected to the A port and the B port of the hydraulic motor (8). The rodless chamber of the variable cylinder (71) is connected to the P port of the pressure limiting valve (73) through the first throttle valve (75). The pressure limiting valve (73) The hydraulic control port of the variable valve (74) is connected to the A port and the B port of the hydraulic motor (8), the A port of the pressure limiting valve (73) is connected to the L port of the variable valve group (7), the B port of the pressure limiting valve (73) is connected to the P port of the variable valve (74), the hydraulic control port of the variable valve (74) is connected to the X port of the variable valve group (7), the B port of the variable valve (74) is connected to the L port of the variable valve group (7), and the A port of the variable valve (74) is connected to both the A port and the B port of the hydraulic motor (8).

5. A winch hydraulic control system according to claim 2, characterized in that: The balancing valve group (6) comprises a balancing valve (61), a second relief valve (62), and a hydraulically controlled ball valve (63). The oil inlet of the balancing valve (61) is connected to the A port of the balancing valve group (6), the hydraulically controlled port of the balancing valve (61) is connected to the X1 port of the balancing valve group (6), the oil outlet of the balancing valve (61) is connected to the SP port and an oil outlet of the balancing valve group (6), the P port of the second relief valve (62) is connected to the X2 port of the balancing valve group (6), and the oil outlet of the balancing valve (61) is connected to the SP port and an oil outlet of the balancing valve group (6). The oil outlet of the balancing valve (61) is connected, the T port of the second relief valve (62) is connected to the B port and another oil outlet of the balancing valve group (6), the X port of the second relief valve (62) is connected to the A port of the hydraulically controlled ball valve (63), the hydraulic control port of the hydraulically controlled ball valve (63) is connected to the X3 port of the balancing valve group (6), and the B port and the spring chamber of the hydraulically controlled ball valve (63) are respectively connected to the two oil return ports of the balancing valve group (6).

6. A winch hydraulic control system according to claim 5, characterized in that: The hydraulic control system further comprises a proportional relief valve (16), wherein the P port of the proportional relief valve (16) is connected to the X4 port of the balancing valve group (6), the B port of the hydraulically controlled ball valve (63) is connected to the X4 port of the balancing valve group (6), and the T port of the proportional relief valve (16) is connected to the hydraulic oil tank (1).

7. A control method for a winch hydraulic control system according to claim 1, characterized in that: The control method comprises the following steps: When the suspended object moves upward along with the deck surface of the ship, the wire rope tends to loosen, the output force of the hydraulic motor (8) is greater than the force of the suspended object, the A port of the hydraulic motor (8) sucks oil and the B port discharges oil, DT3 of the second electromagnetic reversing valve (9) is energized, the B port of the second electromagnetic reversing valve (9) is connected to the P port, and the outlet pressure oil of the hydraulic pump (3) is divided into three paths after passing through the X port of the main reversing valve group (4). The first path, after passing through the third pressure reducing valve (10) and the second electromagnetic reversing valve (9), is replenished with oil to the A port of the hydraulic motor (8) through the SP port of the balancing valve group (6). The second path, after passing through the X port of the control valve group (5) and the external control oil of the balancing valve group (6), is replenished with oil to the A port of the hydraulic motor (8). After the port is opened, the system switches to the constant tension mode. The third route flows through the port A of the second shuttle valve (12) and the port C of the second shuttle valve (12) into the rod chamber of the brake (13), and the brake (13) is normally open. The pressure oil of the port A of the main reversing valve group (4) is divided into two routes after passing through the balance valve group (6). The first route is the oil replenishment route of the port A of the hydraulic motor (8). The second route is pressure-regulated by the balance valve group (6) and then converges with the outlet oil of the port B of the hydraulic motor (8). After passing through the port B1 of the control valve group (5), the port B of the control valve group (5), and the main reversing valve group (4), it flows back to the hydraulic oil tank (1). The hydraulic motor (8) actively retracts the rope and the wire rope is tensioned. When the suspended object moves downward along with the deck surface of the ship, the wire rope tends to be tightened, the B port of the hydraulic motor (8) absorbs oil and the A port discharges oil, the DT3 of the second electromagnetic reversing valve (9) is energized, the B port of the second electromagnetic reversing valve (9) is connected with the P port, and the outlet pressure oil of the hydraulic pump (3) is divided into three paths after passing through the X port of the main reversing valve group (4). The first path passes through the third pressure reducing valve (10) and the second electromagnetic reversing valve (9), and then passes through the SP port of the balancing valve group (6) to replenish oil to the B port of the hydraulic motor (8). The second path passes through the X port of the control valve group (5) and the external control oil port of the balancing valve group (6), and the system switches to the constant tension mode. The third route flows into the rod chamber of the brake (13) after passing through the A port of the second shuttle valve (12) and the C port of the second shuttle valve (12), and the brake (13) is normally open; at the same time, the outlet pressure oil of the hydraulic pump (3) passes through the P port, the B1 port, and the B port of the balance valve group (6) in sequence to replenish the oil of the B port of the hydraulic motor (8), and the excess replenishing oil flow passes through the B port of the control valve group (5) and the main reversing valve group (4) and then flows back to the hydraulic oil tank (1). The outlet oil of the A port of the hydraulic motor (8) passes through the balance valve group (6) and then returns to the B port of the hydraulic motor (8), and the hydraulic motor (8) actively releases the rope, and the wire rope is relaxed.

8. The control method of the winch hydraulic control system according to claim 7, characterized in that: The control method further comprises the following steps: When the suspended object does not move upward or downward with the deck surface of the ship, When DT1 of the main reversing valve group (4) is energized, the main reversing valve group (4) works in the right position, the P port of the main reversing valve group (4) is connected to the A port, and the B port is connected to the T port. The outlet pressure oil of the hydraulic pump (3) passes through the P port and the A port of the main reversing valve group (4) in sequence and is divided into two paths. One path passes through the A port of the first shuttle valve (11), the C port of the first shuttle valve (11), the B port of the second shuttle valve (12), and the C port of the second shuttle valve (12) and then flows to the The first path of the hydraulic oil flows into the rod chamber of the brake (13), and the brake (13) opens; the other path passes through the A port of the balance valve group (6) and then enters the A port of the hydraulic motor (8). The pressure oil at the B port of the hydraulic motor (8) flows through the B port of the balance valve group (6), the B1 port of the control valve group (5), the B port of the control valve group (5), the B port of the main reversing valve group (4), the T port of the main reversing valve group (4), and then flows back to the hydraulic oil tank (1). The hydraulic motor (8) rotates forward to retract the rope; When DT2 of the main reversing valve group (4) is energized, the main reversing valve group (4) works in the left position, the P port of the main reversing valve group (4) is connected to the B port, and the A port is connected to the T port. The outlet pressure oil of the hydraulic pump (3) passes through the P port of the main reversing valve group (4), the B port of the main reversing valve group (4), the B port of the control valve group (5), and the B1 port of the control valve group (5) and is divided into two paths. One path passes through the B port of the balance valve group (6) and enters the B port of the hydraulic motor (8). The other path is connected to the B port of the hydraulic motor (8). The oil flows through the B port of the first shuttle valve (11), the C port of the first shuttle valve (11), the B port of the second shuttle valve (12), and the C port of the second shuttle valve (12) and then flows into the rod chamber of the brake (13), and the brake (13) opens; at the same time, the A port of the hydraulic motor (8) flows through the A port of the balance valve group (6), the A port of the main reversing valve group (4), and the T port of the main reversing valve group (4) in sequence and then flows back to the hydraulic oil tank (1), and the hydraulic motor (8) reverses to release the rope.

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