A control method for a hydraulic system of a blade mounting winch

Abstract

The present invention provides a control method for the hydraulic system of a blade installation winch; when multiple push-pull oil cylinders are in synchronous motion, the oil circuits between adjacent push-pull oil cylinders are connected, so that the oil volume of the hydraulic oil in the multiple push-pull oil cylinders is consistent, and the oil pressure is balanced, so that the multiple push-pull oil cylinders can be synchronously extended and retracted; and when the oil circuits between adjacent push-pull oil cylinders are disconnected, each push-pull oil cylinder is independent, and when one of the push-pull oil cylinders is controlled to move, it will not affect the other push-pull oil cylinders; when the push-pull oil cylinder moves alone, it will not be interfered by the hydraulic oil of the other push-pull oil cylinders. Then, by controlling the reversing of the power three-position four-way solenoid valve, multiple push-pull oil cylinders can be controlled to extend and retract synchronously, and each push-pull oil cylinder can also be controlled to extend and retract individually.

Description

Technical Field

[0001] The invention relates to wind power generation installation equipment, and in particular to a control method for a hydraulic system of a blade installation winch. Background Art

[0002] Wind power generation is widely used as a new energy source; when installing the blades of a windmill, the hub of the windmill needs to be positioned and clamped; then the hub is pushed to rotate; the installation opening of the hub is in a horizontal position with the blades; and then the blades are installed.

[0003] A patent document with application number 201610388748.2 in China and publication date 2016.10.26 discloses a hydraulic control system for a rudder blade platform; the control system includes an oil tank, a variable pump, a motor, a speed control valve, a relief valve, a three-position four-way electromagnetic reversing valve A, a three-position four-way electromagnetic reversing valve B, a first two-way balancing valve, a second two-way balancing valve, a first hydraulic cylinder and a second hydraulic cylinder; the variable pump is connected to the motor; the oil inlet of the variable pump is connected to the oil tank, and the oil outlet of the variable pump is connected to the speed control valve and the relief valve respectively; the oil outlet of the relief valve is connected to the oil tank; a pressure gauge is provided between the variable pump and the relief valve; the outlet of the speed control valve is connected to the three-position four-way electromagnetic reversing valve A and the three-position four-way electromagnetic reversing valve B respectively; the three-position four-way electromagnetic reversing valve A is connected to the first two-way balancing valve; the first two-way balancing valve is connected to the first hydraulic cylinder; the three-position four-way electromagnetic reversing valve B is connected to the second two-way balancing valve; the second two-way balancing valve is connected to the second hydraulic cylinder.

[0004] However, in this control system, there is no connecting oil circuit between the first hydraulic cylinder and the second hydraulic cylinder; the hydraulic oil in the first hydraulic cylinder cannot flow directly into the second hydraulic cylinder; the oil pressure of the hydraulic oil in the first hydraulic cylinder and the second hydraulic cylinder cannot be kept consistent; and it is impossible to achieve synchronous extension and retraction of the first hydraulic cylinder and the second hydraulic cylinder. Summary of the invention

[0005] The present invention provides a control method for the hydraulic system of a blade mounting winch; the method can control multiple push-pull oil cylinders to extend and retract synchronously; and the method can also control each push-pull oil cylinder to extend and retract individually.

[0006] To achieve the above object, the technical solution of the present invention is: a control method for a hydraulic system of a blade mounting winch, comprising the following steps:

[0007] (1) Preset timing limit; the timing limit is used to calculate the running time of the first oil pump and the second oil pump after starting.

[0008] (1.1). The K7 end of the first unloading valve and the K8 end of the second unloading valve are energized, and the first unloading valve and the second unloading valve are switched.

[0009] (2) Start the first oil pump and the second oil pump, and the timing limit starts; the hydraulic oil entering the first oil pump flows from the control oil port of the first oil pump to the first unloading valve, and the hydraulic oil flows from the oil port A7 of the first unloading valve to the oil port T7 of the first unloading valve and then flows back to the oil tank; the hydraulic oil entering the second oil pump flows from the control oil port of the second oil pump to the second unloading valve, and the hydraulic oil flows from the oil port A8 of the second unloading valve to the oil port T8 of the second unloading valve and then flows back to the oil tank.

[0010] (3) Determine whether the timing limit has expired. If so, proceed to step (4).

[0011] (4) The K7 end of the first unloading valve and the K8 end of the second unloading valve are energized, and the first unloading valve and the second unloading valve are switched; the hydraulic oil entering the first oil pump flows out from the oil outlet of the first oil pump; the hydraulic oil entering the second oil pump flows out from the oil outlet of the second oil pump.

[0012] (5). The K1 end of the locking three-position four-way solenoid valve is energized, and the hydraulic oil flows from the oil port P1 of the locking three-position four-way solenoid valve to the oil port B1 of the locking three-position four-way solenoid valve and then flows into the rodless cavity of the locking pin cylinder. The hydraulic oil in the rod cavity of the locking pin cylinder flows from the oil port A1 of the locking three-position four-way solenoid valve to the oil port T1 of the locking three-position four-way solenoid valve; the locking pin cylinder extends. After the locking pin cylinder is fully extended, the locking three-position four-way solenoid valve is reset to the middle position.

[0013] (6) When the K3 terminal of the clamping three-position four-way solenoid valve is energized, the hydraulic oil flows from the oil port P2 of the clamping three-position four-way solenoid valve to the oil port B2 of the clamping three-position four-way solenoid valve and then flows into the rodless cavity of the clamping cylinder. The hydraulic oil in the rod cavity of the clamping cylinder flows from the oil port A2 of the clamping three-position four-way solenoid valve to the oil port T2 of the clamping three-position four-way solenoid valve; the clamping cylinder extends; when the clamping cylinder is fully extended, the clamping three-position four-way solenoid valve is reset to the middle position.

[0014] (6.1). If you need to control multiple push-pull cylinders to extend synchronously, proceed to step (7); if you need to control each push-pull cylinder to extend individually, proceed to step (7.4).

[0015] (7). Multiple push-pull electric proportional reversing valves are switched to end a, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port B3 of the push-pull electric proportional reversing valve and then flows into the rodless cavity of the push-pull oil cylinder. The hydraulic oil in the rod cavity of the push-pull oil cylinder flows from the oil port A3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull oil cylinders are extended synchronously; and then step (7.1) is performed.

[0016] (7.1). If you need to control multiple push-pull cylinders to retract synchronously, proceed to step (7.2); if you need to control a push-pull cylinder to retract alone, proceed to step (7.3);

[0017] (7.2). Multiple push-pull electric proportional reversing valves are switched to end b, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull oil cylinders retract synchronously.

[0018] (7.3). The K5 end of the power three-position four-way solenoid valve is energized; the hydraulic oil is no longer input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the push-pull electric proportional reversing valve is switched to the b end, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the single push-pull oil cylinder retracts.

[0019] (7.4). The K5 end of the power three-position four-way solenoid valve is energized; the hydraulic oil is no longer input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the oil circuit between adjacent push-pull cylinders is disconnected; the push-pull electric proportional reversing valve is switched to the a end, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port B3 of the push-pull electric proportional reversing valve and then flows into the rodless cavity of the push-pull cylinder. The hydraulic oil in the rod cavity of the push-pull cylinder flows from the oil port A3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the push-pull cylinder extends; and then proceed to step (7.5).

[0020] (7.5). If you need to control a push-pull cylinder to retract alone, proceed to step (7.6); if you need to control multiple push-pull cylinders to retract synchronously, proceed to step (7.7);

[0021] (7.6). The push-pull electric proportional reversing valve changes direction to end b, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the single push-pull oil cylinder retracts;

[0022] (7.7). The K5 end of the power three-position four-way solenoid valve loses power; the hydraulic oil is input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the oil ports between adjacent push-pull cylinders are connected; the hydraulic oil in adjacent push-pull cylinders maintains the same oil volume; multiple push-pull electric proportional reversing valves are switched to the b end, the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull cylinder, and the hydraulic oil in the rodless cavity of the push-pull cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull cylinders retract synchronously.

[0023] In the above method, when the oil pump is started, the load of the motor of the starting oil pump is relatively large; before starting the first oil pump and the second oil pump, the first unloading valve and the second unloading valve are first switched so that the control oil port of the first oil pump and the control oil port of the second oil pump are connected to the oil tank; after the first oil pump and the second oil pump are started, the hydraulic oil entering the first oil pump and the second oil pump flows back to the oil tank; the amount of hydraulic oil in the first oil pump and the second oil pump is reduced, thereby reducing the load of the motor; after the first oil pump and the second oil pump have been operated for a period of time, the load of the motor will decrease; through the timing time limit, when the running time of the first oil pump and the second oil pump reaches the timing time limit; it is judged that the first oil pump and the second oil pump are operating normally and the load of their motors has decreased; at this time, the first unloading valve and the first unloading valve are closed; the oil outlet of the first oil pump and the oil outlet of the second oil pump can output hydraulic oil. When multiple push-pull cylinders are in synchronous motion, the oil circuits between adjacent push-pull cylinders are connected, so that the amount of hydraulic oil in multiple push-pull cylinders is consistent and the oil pressure is balanced, so that multiple push-pull cylinders can be extended and retracted synchronously. When the oil circuits between adjacent push-pull cylinders are disconnected, each push-pull cylinder is independent, and when one of the push-pull cylinders is controlled to move, it will not affect the other push-pull cylinders. When the push-pull cylinder moves alone, it will not be interfered by the hydraulic oil of the other push-pull cylinders. Then, by controlling the reversing of the three-position four-way solenoid valve, multiple push-pull cylinders can be controlled to extend and retract synchronously, and each push-pull cylinder can be controlled to extend and retract individually.

[0024] Furthermore, step (4) further includes: after the hydraulic oil flows out from the oil outlet of the first oil pump and the oil outlet of the second oil pump; performing steps (5)-(6); and then performing step (6.1);

[0025] (5) When the K1 end of the locking three-position four-way solenoid valve is energized, the hydraulic oil flows from the oil port P1 of the locking three-position four-way solenoid valve to the oil port B1 of the locking three-position four-way solenoid valve and then flows into the rodless cavity of the locking pin cylinder. The hydraulic oil in the rod cavity of the locking pin cylinder flows from the oil port A1 of the locking three-position four-way solenoid valve to the oil port T1 of the locking three-position four-way solenoid valve; the locking pin cylinder extends. After the locking pin cylinder is fully extended, the locking three-position four-way solenoid valve is reset to the middle position;

[0026] (6) When the K3 terminal of the clamping three-position four-way solenoid valve is energized, the hydraulic oil flows from the oil port P2 of the clamping three-position four-way solenoid valve to the oil port B2 of the clamping three-position four-way solenoid valve and then flows into the rodless cavity of the clamping cylinder. The hydraulic oil in the rod cavity of the clamping cylinder flows from the oil port A2 of the clamping three-position four-way solenoid valve to the oil port T2 of the clamping three-position four-way solenoid valve; the clamping cylinder extends; when the clamping cylinder is fully extended, the clamping three-position four-way solenoid valve is reset to the middle position.

[0027] In the above method, the fixing portion of the wheel hub is positioned by extending the locking pin oil cylinder; and then the clamping oil cylinder is extended to clamp the fixing portion of the wheel hub.

[0028] Furthermore, step (4) also includes: the hydraulic oil flowing out from the oil outlet of the first oil pump and the oil outlet of the second oil pump enters the high-pressure filter for filtration and then flows to the push-pull electric proportional reversing valve, the clamping three-position four-way solenoid valve, the locking three-position four-way solenoid valve and the power three-position four-way solenoid valve. In this way, the cleanliness of the hydraulic oil can be maintained.

[0029] Furthermore, after step (7.3) is completed, step (12) is performed.

[0030] (12) Individually control the remaining push and pull cylinders to retract in sequence.

[0031] Further, after step (7.6) is completed, proceed to step (13);

[0032] (13) Individually control the remaining push-pull cylinders to extend in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The schematic diagram of the hydraulic system using the present invention.

[0034] Figure 2 for Figure 1 Enlarged view of a.

[0035] Figure 3 for Figure 1 Enlarged view of middle b.

[0036] Figure 4 It is a schematic diagram of the cooperation between the turning wheel and the wheel hub using the present invention.

[0037] Figure 5 It is a schematic diagram of the cooperation between the push-pull oil cylinder and the wheel hub using the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1-5As shown; a control method for a hydraulic system of a blade mounting winch; the hydraulic system includes a power system 1 and a control system 2; the control system 2 is provided with more than two groups; the power system 1 supplies oil to more than two groups of control systems 2; in this embodiment, the control system 2 is provided with five groups. Each group of control systems 2 includes a locking oil circuit 23, a clamping oil circuit 22 and a push-pull oil circuit 21. The power system 1 includes an oil tank 11 and a pump station system 12; the oil tank 11 is connected to the pump station system 12. The locking oil circuit 23 includes a locking three-position four-way solenoid valve 231, a locking hydraulically controlled one-way valve 232 and a locking pin cylinder 233; the oil port P1 end of the locking three-position four-way solenoid valve of the locking three-position four-way solenoid valve 231 is connected to the pump station system 12; the T1 end of the locking three-position four-way solenoid valve 231 is connected to the oil tank 11; the A1 end of the locking three-position four-way solenoid valve 231 is connected to the control oil port of the locking hydraulically controlled one-way valve 232 and the rod cavity port of the locking pin cylinder 233; the oil port B1 end of the locking three-position four-way solenoid valve of the locking three-position four-way solenoid valve 231 is connected to the oil inlet port of the locking hydraulically controlled one-way valve 232; the rodless cavity port of the locking pin cylinder 233 is connected to the oil outlet port of the locking hydraulically controlled one-way valve 232.

[0040] The clamping oil circuit 22 includes a clamping three-position four-way solenoid valve 221, a clamping hydraulically controlled one-way valve 222 and a clamping cylinder 223; the P2 end of the clamping three-position four-way solenoid valve 221 is connected to the pump station system 12; the T2 end of the clamping three-position four-way solenoid valve 221 is connected to the oil tank 11; the A2 end of the clamping three-position four-way solenoid valve 221 is connected to the control oil port of the clamping hydraulically controlled one-way valve 222 and the rod cavity port of the clamping cylinder 223; the B2 end of the clamping three-position four-way solenoid valve 221 is connected to the oil inlet of the clamping hydraulically controlled one-way valve 222.

[0041] An accumulator 224 is connected between the oil outlet of the clamping hydraulic control one-way valve 222 and the rodless cavity of the clamping oil cylinder 223. By providing the accumulator 224, a part of the hydraulic oil flowing out of the oil outlet of the clamping hydraulic control one-way valve 222 is stored in the accumulator 224; thus, when the hydraulic oil is no longer input from the oil inlet of the clamping hydraulic control one-way valve 222, the accumulator 224 can still keep the external support force of the clamping oil cylinder 223 unchanged.

[0042] A clamping one-way throttle valve is connected between the clamping three-position four-way solenoid valve 221 and the clamping hydraulic one-way valve 222. The clamping one-way throttle valve includes a clamping one-way valve 225 and a clamping throttle valve 226; the oil inlet of the clamping throttle valve 226 is connected to the B2 end of the clamping three-position four-way solenoid valve 221; the oil outlet of the clamping throttle valve 226 is connected to the oil inlet of the clamping hydraulic one-way valve 222; the oil inlet of the clamping one-way valve 225 is connected to the oil outlet of the clamping throttle valve 226, and the oil outlet of the clamping one-way valve 225 is connected to the oil inlet of the clamping throttle valve 226.

[0043] The push-pull oil circuit 21 includes a push-pull electric proportional reversing valve 211, a push-pull balancing valve and a push-pull oil cylinder 212; the oil port P3 end of the push-pull electric proportional reversing valve of the push-pull electric proportional reversing valve 211 is connected to the pump station system 12; the oil port T3 end of the push-pull electric proportional reversing valve of the push-pull electric proportional reversing valve 211 is connected to the oil tank 11; the oil port A3 end of the push-pull electric proportional reversing valve of the push-pull electric proportional reversing valve 211 and the oil port B3 end of the push-pull electric proportional reversing valve are connected to the push-pull balancing valve; the push-pull balancing valve is connected to the rod cavity port of the push-pull oil cylinder 212 and the rodless cavity port of the push-pull oil cylinder 212. The push-pull oil cylinder 212 is controlled by the push-pull electric proportional reversing valve 211; the synchronization effect of multiple push-pull oil cylinders 212 is achieved; and the rodless cavity of the push-pull oil cylinder 212 and the rod cavity of the push-pull oil cylinder 212 are maintained under pressure by setting a push-pull balancing valve.

[0044] The push-pull balancing valve includes a first push-pull check valve 213, a second push-pull check valve 215, a first push-pull relief valve 214 and a second push-pull relief valve 216. The oil outlet of the first push-pull relief valve 214 is connected to the oil port A3 end of the push-pull electric proportional reversing valve of the push-pull three-position four-way solenoid valve, and the oil inlet of the first push-pull relief valve 214 is connected to the rod cavity of the push-pull oil cylinder 212; the oil outlet of the second push-pull relief valve 216 is connected to the oil port B3 end of the push-pull electric proportional reversing valve of the push-pull three-position four-way solenoid valve, and the oil inlet of the second push-pull relief valve 216 is connected to the rodless cavity of the push-pull oil cylinder 212. The oil inlet of the first push-pull one-way valve 213 is connected to the oil outlet of the first push-pull relief valve 214, and the oil outlet of the first push-pull one-way valve 213 is connected to the oil inlet of the first push-pull relief valve 214; the oil inlet of the second push-pull one-way valve 215 is connected to the oil outlet of the second push-pull relief valve 216, and the oil outlet of the second push-pull one-way valve 215 is connected to the oil inlet of the second push-pull relief valve 216.

[0045] The push-pull oil circuit 21 also includes a first logic valve 217 and a second logic valve 218; the A5 end of the first logic valve 217 is connected to the rod cavity port of the push-pull oil cylinder 212; the A6 end of the second logic valve 218 is connected to the rodless cavity port of the push-pull oil cylinder 212; the other ends of more than two first logic valves 217 are connected to each other; in this embodiment, the B5 ends of the five first logic valves 217 are connected to each other. The other ends of more than two second logic valves 218 are connected to each other; in this embodiment, the B6 ends of the five second logic valves 218 are connected to each other. The power system 1 also includes a power three-position four-way solenoid valve 13; the oil tank 11 is connected to the T4 end of the power three-position four-way solenoid valve 13; the pump station system 12 is connected to the P4 end of the power three-position four-way solenoid valve 13; the signal end of the first logic valve 217 and the signal end of the second logic valve 218 are both connected to the A4 end of the power three-position four-way solenoid valve 13. The B4 end of the power three-position four-way solenoid valve 13 is cut off. The oil drain port of the first logic valve 217 and the oil drain port of the second logic valve 218 are both connected to the oil tank 11 .

[0046] The pump station system 12 includes a first oil pump 121, a second oil pump 122 and a pressure protection relief valve 123; the oil inlet of the first oil pump 121, the oil return port of the first oil pump 121, the oil inlet of the second oil pump 122, and the oil return port of the second oil pump 122 are all connected to the oil tank 11; the oil outlet of the first oil pump 121 and the oil outlet of the second oil pump 122 are all connected to one end of the power three-position four-way solenoid valve 13, one end of the locking three-position four-way solenoid valve 231, one end of the clamping three-position four-way solenoid valve 221, and one end of the push-pull electric proportional reversing valve 211; the control oil port of the first oil pump 121 and the control oil port of the second oil pump 122 are both connected to one end of the pressure protection relief valve 123, and the other end of the pressure protection relief valve 123 is connected to the oil tank 11. By setting the pressure protection relief valve 123, when the pressure of the first oil pump 121 and the second oil pump 122 is high, the hydraulic oil flows back to the oil tank 11 through the pressure protection relief valve 123, thereby reducing the pressure of the oil pump.

[0047] A first check valve 124 is connected between the control oil port of the first oil pump 121 and the pressure protection relief valve 123; a second check valve 125 is connected between the control oil port of the second oil pump 122 and the pressure protection relief valve 123. The first check valve 124 is provided to prevent the hydraulic oil from flowing out of the pressure protection relief valve 123 to the first oil pump 121; the second check valve 125 is provided to prevent the hydraulic oil from flowing out of the pressure protection relief valve 123 to the second oil pump 122.

[0048] The pump station system 12 also includes a first unloading valve 126 and a second unloading valve 127; the control oil port of the first oil pump 121 is connected to one end of the first unloading valve 126; the control oil port of the second oil pump 122 is connected to one end of the second unloading valve 127; the other end of the first unloading valve 126 and the other end of the second unloading valve 127 are connected to the oil tank 11.

[0049] The load on the first oil pump 121 and the second oil pump 122 is relatively large when they are started; the first oil pump 121 is unloaded through the first unloading valve 126; the second oil pump 122 is unloaded through the second unloading valve 127; the load on the first oil pump 121 and the second oil pump 122 is reduced to avoid the large load generated when the first oil pump 121 and the second oil pump 122 are started. Impact on the pump station system 12.

[0050] In this embodiment, the oil outlet of the first oil pump 121 and the oil outlet of the second oil pump 122 are connected to one end of the high-pressure filter 128; the other end of the high-pressure filter 128 is connected to the push-pull electric proportional reversing valve 211, the clamping three-position four-way solenoid valve 221, the locking three-position four-way solenoid valve 231 and the power three-position four-way solenoid valve 13. By setting the high-pressure filter 128, the cleanliness of the hydraulic oil is maintained. Further, a cooler 111, a liquid level gauge (not shown in the figure), a high oil temperature alarm (not shown in the figure) and a low liquid level alarm (not shown in the figure) are provided on the oil tank 11; the cooler 111 is used to cool the hydraulic oil in the oil tank 11; the liquid level gauge is used to display the liquid level of the hydraulic oil in the oil tank 11; the high oil temperature alarm is used to detect the oil temperature of the hydraulic oil in the oil tank 11 and issue an early warning; the low liquid level alarm is used to detect the hydraulic oil in the oil tank 11 and issue an early warning.

[0051] Reference Figure 4-5 As shown in the figure, a locking cylinder 233, a clamping cylinder 223 and a push-pull cylinder 212 are installed on the turning wheel 3. The wheel hub includes a fixed part 41 and a rotating part 42; three mounting holes 43 are provided on the rotating part. The rotating part 42 is mounted on the fixed part 41 and rotates relative to the fixed part 41. The locking cylinder 233 is used to position the fixed part 41; the clamping cylinder 223 is used to clamp the fixed part 41; and the push-pull cylinder 212 is used to rotate the rotating part 42. Five positioning holes (not shown in the figure) are provided at the bottom of the fixing part; in the present embodiment, the locking pin cylinder 233 extends into the positioning hole to position the fixing part 41; at the same time, the turning gear drives the push-pull cylinder 212 to penetrate into the rotating part 42; then the fixing part 41 is clamped by the clamping cylinder 223; after clamping the fixing part 41, the five push-pull cylinders 212 extend synchronously to contact the inner surface of the rotating part 42 to drive the rotating part 42 to rotate; and then the mounting hole 43 is driven to rotate, so that the mounting hole 43 can be aligned with the blade to be installed.

[0052] The hydraulic system is supplied with oil through the power system 1; it is energized through the K1 end of the locking three-position four-way solenoid valve 231, and the hydraulic oil flows from the oil port P1 of the locking three-position four-way solenoid valve to the oil port B1 of the locking three-position four-way solenoid valve; the hydraulic oil in the locking pin cylinder 233 flows from the oil port A1 of the locking three-position four-way solenoid valve to the oil port T1 of the locking three-position four-way solenoid valve; the hydraulic oil flows into the oil inlet of the locking hydraulic control one-way valve 232 and then flows into the rodless cavity of the locking pin cylinder 233, thereby extending the locking pin cylinder 233. Power is obtained through the K2 end of the locking three-position four-way solenoid valve 231; the hydraulic oil flows from the oil port P1 of the locking three-position four-way solenoid valve to the oil port A1 of the locking three-position four-way solenoid valve; the hydraulic oil flows to the control oil port of the locking hydraulically controlled one-way valve 232 to open the locking hydraulically controlled one-way valve 232; the hydraulic oil in the locking pin cylinder 233 flows from the oil port B1 of the locking three-position four-way solenoid valve to the oil port T1 of the locking three-position four-way solenoid valve; the hydraulic oil flows from the rodless cavity of the locking pin cylinder 233 to the oil outlet of the locking hydraulically controlled one-way valve 232, and then is discharged through the locking three-position four-way solenoid valve 231, so that the locking pin cylinder 233 is retracted; the locking oil circuit 23 positions the wheel hub by extending the locking pin cylinder 233.

[0053] The K3 end of the clamping three-position four-way solenoid valve 221 is energized, and the hydraulic oil flows from the oil port P2 of the clamping three-position four-way solenoid valve to the oil port B2 of the clamping three-position four-way solenoid valve; the hydraulic oil in the clamping cylinder 223 flows from the oil port A2 of the clamping three-position four-way solenoid valve to the oil port T2 of the clamping three-position four-way solenoid valve; the hydraulic oil flows into the oil inlet of the clamping hydraulic control one-way valve 222 and then flows into the rodless cavity of the clamping cylinder 223, thereby extending the clamping cylinder 223. The K4 end of the clamping three-position four-way solenoid valve 221 is energized, and the hydraulic oil flows from the oil port P2 of the clamping three-position four-way solenoid valve to the oil port A2 of the clamping three-position four-way solenoid valve; the hydraulic oil flows to the control oil port of the clamping hydraulically controlled one-way valve 222 to open the clamping hydraulically controlled one-way valve 222; the hydraulic oil in the clamping cylinder 223 flows from the oil port B2 of the clamping three-position four-way solenoid valve to the oil port T2 of the clamping three-position four-way solenoid valve; the hydraulic oil flows from the rodless cavity of the clamping cylinder 223 to the oil outlet of the clamping hydraulically controlled one-way valve 222, and then is discharged through the clamping three-position four-way solenoid valve 221 to retract the clamping cylinder 223; the clamping oil circuit 22 clamps the wheel hub by extending the clamping cylinder 223.

[0054] By reversing the push-pull electric proportional reversing valve 211 to the a end, the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port B3 of the push-pull electric proportional reversing valve; the hydraulic oil in the push-pull oil cylinder 212 flows from the oil port A3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the hydraulic oil flows into the rodless cavity of the push-pull oil cylinder 212, so that the push-pull oil cylinder 212 is extended. By reversing the push-pull electric proportional reversing valve 211 to the b end, the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve; the hydraulic oil in the push-pull oil cylinder 212 flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the hydraulic oil flows out from the rodless cavity of the push-pull oil cylinder 212, and then is discharged through the push-pull electric proportional reversing valve 211, so that the push-pull oil cylinder 212 is retracted. The push-pull oil circuit 21 pushes the wheel hub to rotate by extending the push-pull oil cylinder 212 .

[0055] By setting the first logic valve 217 and the second logic valve 218, when the first logic valve 217 and the second logic valve 218 between adjacent push-pull cylinders 212 are connected, the hydraulic oil in one push-pull cylinder 212 will flow into other push-pull cylinders 212, and when controlling the movement of multiple push-pull cylinders 212, the amount of hydraulic oil in multiple push-pull cylinders 212 is made consistent, and thus the oil pressure in the push-pull cylinders 212 is made consistent. At the same time, by reversing the power three-position four-way solenoid valve 13, the first logic valve 217 and the second logic valve 218 are controlled to be reversed; when the first logic valve 217 and the second logic valve 218 between adjacent push-pull cylinders 212 are not connected, when controlling the movement of one of the push-pull cylinders 212, the hydraulic oil in the push-pull cylinder 212 cannot flow to the remaining push-pull cylinders 212, and thus does not interfere with the remaining push-pull cylinders 212. When multiple push-pull electric proportional reversing valves 211 are all switched to end a, the power system 1 supplies oil, the oil pressure of multiple push-pull cylinders 212 is consistent, and multiple push-pull cylinders 212 extend synchronously; when multiple push-pull electric proportional reversing valves 211 are all switched to end b, the power system 1 supplies oil, the oil pressure in multiple push-pull cylinders 212 is consistent, and multiple push-pull cylinders 212 retract synchronously. When the power three-position four-way solenoid valve 13 is switched, each push-pull cylinder 212 is controlled to extend or retract individually, and the oil pressure of the other push-pull cylinders 212 is not affected. Avoid controlling one push-pull cylinder 212 to extend or retract individually, and the other push-pull cylinders 212 do not move, and the consistent oil pressure in multiple push-pull cylinders 212 interferes with the push-pull cylinders 212 that need to move. By setting the three-position four-way solenoid valve 13, it is possible to control multiple push-pull cylinders 212 to extend synchronously and multiple push-pull cylinders 212 to retract synchronously; it is also possible to control each push-pull cylinder 212 to extend and retract individually.

[0056] The control method comprises the following steps:

[0057] (1) Preset timing limit; the timing limit is used to calculate the running time of the first oil pump and the second oil pump after starting.

[0058] (1.1). The K7 end of the first unloading valve and the K8 end of the second unloading valve are energized, and the first unloading valve and the second unloading valve are switched.

[0059] (2) Start the first oil pump and the second oil pump, and the timing limit starts; the hydraulic oil entering the first oil pump flows from the control oil port of the first oil pump to the first unloading valve, and the hydraulic oil flows from the oil port A7 of the first unloading valve to the oil port T7 of the first unloading valve and then flows back to the oil tank; the hydraulic oil entering the second oil pump flows from the control oil port of the second oil pump to the second unloading valve, and the hydraulic oil flows from the oil port A8 of the second unloading valve to the oil port T8 of the second unloading valve and then flows back to the oil tank.

[0060] (3) Determine whether the timing limit has expired. If so, proceed to step (4).

[0061] (4) The K7 end of the first unloading valve and the K8 end of the second unloading valve are energized, and the first unloading valve and the second unloading valve are switched; the hydraulic oil entering the first oil pump flows out from the oil outlet of the first oil pump; the hydraulic oil entering the second oil pump flows out from the oil outlet of the second oil pump.

[0062] (5). The K1 end of the locking three-position four-way solenoid valve is energized, and the hydraulic oil flows from the oil port P1 of the locking three-position four-way solenoid valve to the oil port B1 of the locking three-position four-way solenoid valve and then flows into the rodless cavity of the locking pin cylinder. The hydraulic oil in the rod cavity of the locking pin cylinder flows from the oil port A1 of the locking three-position four-way solenoid valve to the oil port T1 of the locking three-position four-way solenoid valve; the locking pin cylinder extends. After the locking pin cylinder is fully extended, the locking three-position four-way solenoid valve is reset to the middle position.

[0063] (6) When the K3 terminal of the clamping three-position four-way solenoid valve is energized, the hydraulic oil flows from the oil port P2 of the clamping three-position four-way solenoid valve to the oil port B2 of the clamping three-position four-way solenoid valve and then flows into the rodless cavity of the clamping cylinder. The hydraulic oil in the rod cavity of the clamping cylinder flows from the oil port A2 of the clamping three-position four-way solenoid valve to the oil port T2 of the clamping three-position four-way solenoid valve; the clamping cylinder extends; when the clamping cylinder is fully extended, the clamping three-position four-way solenoid valve is reset to the middle position.

[0064] (6.1). If you need to control multiple push-pull cylinders to extend synchronously, proceed to step (7); if you need to control each push-pull cylinder to extend individually, proceed to step (7.4).

[0065] (7). Multiple push-pull electric proportional reversing valves are switched to end a, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port B3 of the push-pull electric proportional reversing valve and then flows into the rodless cavity of the push-pull oil cylinder. The hydraulic oil in the rod cavity of the push-pull oil cylinder flows from the oil port A3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull oil cylinders are extended synchronously.

[0066] (7.1). If it is necessary to control multiple push-pull cylinders to retract synchronously, proceed to step (7.2); if it is necessary to control a push-pull cylinder to retract alone, proceed to step (7.3). In this embodiment, proceed to step (7.3).

[0067] (7.2). Multiple push-pull electric proportional reversing valves are switched to end b, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull oil cylinders retract synchronously.

[0068] (7.3). The K5 end of the power three-position four-way solenoid valve is energized; the hydraulic oil is no longer input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the push-pull electric proportional reversing valve is switched to the b end, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the single push-pull oil cylinder retracts. Then proceed to step (12)

[0069] (7.4). The K5 end of the power three-position four-way solenoid valve is energized; the hydraulic oil is no longer input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the oil circuit between adjacent push-pull cylinders is disconnected; the push-pull electric proportional reversing valve is switched to the a end, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port B3 of the push-pull electric proportional reversing valve and then flows into the rodless cavity of the push-pull cylinder. The hydraulic oil in the rod cavity of the push-pull cylinder flows from the oil port A3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the push-pull cylinder extends; and then proceed to step (7.5).

[0070] (7.5). If you need to control a push-pull cylinder to retract alone, proceed to step (7.6); if you need to control multiple push-pull cylinders to retract synchronously, proceed to step (7.7).

[0071] (7.6). The push-pull electric proportional reversing valve changes direction to end b, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the single push-pull oil cylinder retracts.

[0072] (7.7). The K5 end of the power three-position four-way solenoid valve loses power; the hydraulic oil is input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the oil ports between adjacent push-pull cylinders are connected; the hydraulic oil in adjacent push-pull cylinders maintains the same oil volume; multiple push-pull electric proportional reversing valves are switched to the b end, the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull cylinder, and the hydraulic oil in the rodless cavity of the push-pull cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull cylinders retract synchronously.

[0073] In this embodiment, in step (6.1), choose to perform step (7); then perform (8)-(10); then perform step (7.1).

[0074] (8) Determine whether the mounting hole of the hub is aligned with the blade; if not, the push-pull cylinder continues to extend to drive the rotating part to rotate; if so, proceed to step (9).

[0075] (9). The push-pull electric proportional reversing valve is reset to the middle position.

[0076] (10). Install the blade into the mounting hole; now the blade installation is complete, proceed to step (7.1).

[0077] In step (7.1), select step (7.3). Then proceed to step (12).

[0078] (12) Individually control the remaining push and pull cylinders to retract in sequence; then proceed to step (12.1)

[0079] (12.1). After all the push and pull cylinders are retracted, the K5 terminal of the three-position four-way power solenoid valve loses power.

[0080] (12.2). Repeat steps (7), (8)-(10), and (7.3)-(12.1) to complete the installation of all blades.

[0081] (12.3). The K2 end of the locking three-position four-way solenoid valve is energized, and the locking pin cylinder retracts; the K4 end of the clamping three-position four-way solenoid valve is energized, and the clamping cylinder retracts; then the locking three-position four-way solenoid valve and the clamping three-position four-way solenoid valve are reset to the middle position.

[0082] In the above method, when the oil pump is started, the load of the motor of the starting oil pump is relatively large; before starting the first oil pump and the second oil pump, the first unloading valve and the second unloading valve are first switched so that the control oil port of the first oil pump and the control oil port of the second oil pump are connected to the oil tank; after the first oil pump and the second oil pump are started, the hydraulic oil entering the first oil pump and the second oil pump flows back to the oil tank; the amount of hydraulic oil in the first oil pump and the second oil pump is reduced, thereby reducing the load of the motor; after the first oil pump and the second oil pump have been operated for a period of time, the load of the motor will decrease; through the timing time limit, when the running time of the first oil pump and the second oil pump reaches the timing time limit; it is judged that the first oil pump and the second oil pump are operating normally and the load of their motors has decreased; at this time, the first unloading valve and the first unloading valve are closed; the oil outlet of the first oil pump and the oil outlet of the second oil pump can output hydraulic oil. Then, first extend the locking cylinder to position the fixed part of the hub; then extend the clamping cylinder to clamp the fixed part of the hub; then extend the push-pull cylinder to push the rotating part of the hub to rotate; when the rotating part rotates so that the mounting hole is aligned with the blade; the push-pull electric proportional reversing valve is reset to the middle position; the push-pull cylinder supports the rotating part to keep it stationary; when the blade is installed, the three-position four-way solenoid valve is energized; then control each push-pull cylinder to retract in turn; when one of the push-pull cylinders retracts, the remaining push-pull cylinders support the rotating part to keep it stationary. The method of driving the hub to rotate with the push-pull cylinder and the method of installing the blade on the hub are prior art and will not be described here.

[0083] In the above method:

[0084] Step (4) also includes: the hydraulic oil flowing out from the oil outlet of the first oil pump and the oil outlet of the second oil pump enters the high-pressure filter for filtration and then flows to the push-pull electric proportional reversing valve, the clamping three-position four-way solenoid valve, the locking three-position four-way solenoid valve and the power three-position four-way solenoid valve.

[0085] After step (7.6) is completed, proceed to step (13). (13) Individually control the remaining push and pull cylinders to extend in sequence.

Claims

1. A control method for a hydraulic system of a blade mounting winch, A locking pin cylinder, a clamping cylinder and a push-pull cylinder are installed on the turning gear, and the wheel hub includes a fixed part and a rotating part; three mounting holes are provided on the rotating part, and the rotating part is mounted on the fixed part and rotates relative to the fixed part; the locking pin cylinder is used to position the fixed part; the clamping cylinder is used to clamp the fixed part; the push-pull cylinder is used to rotate the rotating part; five positioning holes are provided at the bottom of the fixed part; the locking pin cylinder extends into the positioning holes to position the fixed part; at the same time, the turning gear drives the push-pull cylinder to penetrate into the rotating part; then the clamping cylinder clamps the fixed part; after clamping the fixed part, the five push-pull cylinders extend synchronously and contact the inner surface of the rotating part to drive the rotating part to rotate; and then the mounting hole is driven to rotate so that the mounting hole can be aligned with the blade to be installed; Features: The following steps are involved: Step (1). Preset a timing limit; the timing limit is used to calculate the running time of the first oil pump and the second oil pump after starting; Step (1.1). The K7 end of the first unloading valve and the K8 end of the second unloading valve are energized, and the first unloading valve and the second unloading valve are switched; Step (2). Start the first oil pump and the second oil pump, and the timing time starts; the hydraulic oil entering the first oil pump flows from the control oil port of the first oil pump to the first unloading valve, and the hydraulic oil flows from the oil port A7 of the first unloading valve to the oil port T7 of the first unloading valve and then flows back to the oil tank; the hydraulic oil entering the second oil pump flows from the control oil port of the second oil pump to the second unloading valve, and the hydraulic oil flows from the oil port A8 of the second unloading valve to the oil port T8 of the second unloading valve and then flows back to the oil tank; Step (3). Determine whether the timing limit has expired. If so, proceed to step (4); Step (4). The K7 end of the first unloading valve and the K8 end of the second unloading valve are energized, and the first unloading valve and the second unloading valve are switched; the hydraulic oil entering the first oil pump flows out from the oil outlet of the first oil pump; the hydraulic oil entering the second oil pump flows out from the oil outlet of the second oil pump; after the hydraulic oil flows out from the oil outlet of the first oil pump and the oil outlet of the second oil pump; proceed to steps (5)-(6); Step (5). The K1 end of the locking three-position four-way solenoid valve is energized, and the hydraulic oil flows from the oil port P1 of the locking three-position four-way solenoid valve to the oil port B1 of the locking three-position four-way solenoid valve and then flows into the rodless cavity of the locking pin cylinder. The hydraulic oil in the rod cavity of the locking pin cylinder flows from the oil port A1 of the locking three-position four-way solenoid valve to the oil port T1 of the locking three-position four-way solenoid valve; the locking pin cylinder extends, and after the locking pin cylinder is fully extended, the locking three-position four-way solenoid valve is reset to the middle position; Step (6). The K3 end of the clamping three-position four-way solenoid valve is energized, and the hydraulic oil flows from the oil port P2 of the clamping three-position four-way solenoid valve to the oil port B2 of the clamping three-position four-way solenoid valve and then flows into the rodless cavity of the clamping cylinder. The hydraulic oil in the rod cavity of the clamping cylinder flows from the oil port A2 of the clamping three-position four-way solenoid valve to the oil port T2 of the clamping three-position four-way solenoid valve; the clamping cylinder extends; when the clamping cylinder is fully extended, the clamping three-position four-way solenoid valve is reset to the middle position, and then step (6.1) is performed; Step (6.1). If it is necessary to control multiple push-pull cylinders to extend synchronously, proceed to step (7); if it is necessary to control each push-pull cylinder to extend individually, proceed to step (7.4); Step (7). Multiple push-pull electric proportional reversing valves are reversed to end a, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port B3 of the push-pull electric proportional reversing valve and then flows into the rodless cavity of the push-pull oil cylinder. The hydraulic oil in the rod cavity of the push-pull oil cylinder flows from the oil port A3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull oil cylinders are extended synchronously; and then step (7.1) is performed; Step (7.1). If you need to control multiple push-pull cylinders to retract synchronously, proceed to step (7.2); if you need to control a push-pull cylinder to retract alone, proceed to step (7.3); Step (7.2). Multiple push-pull electric proportional reversing valves are reversed to end b, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull oil cylinders are retracted synchronously; Step (7.3). The K5 end of the power three-position four-way solenoid valve is energized; the hydraulic oil is no longer input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the push-pull electric proportional reversing valve is switched to the b end, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the single push-pull oil cylinder retracts; Step (7.4). The K5 end of the power three-position four-way solenoid valve is energized; the hydraulic oil is no longer input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the oil circuit between adjacent push-pull cylinders is disconnected; the push-pull electric proportional reversing valve is switched to end a, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port B3 of the push-pull electric proportional reversing valve and then flows into the rodless cavity of the push-pull cylinder. The hydraulic oil in the rod cavity of the push-pull cylinder flows from the oil port A3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the push-pull cylinder extends; Then proceed to step (7.5); Step (7.5). If it is necessary to control a push-pull cylinder to retract alone, proceed to step (7.6); if it is necessary to control multiple push-pull cylinders to retract synchronously, proceed to step (7.7); Step (7.6). The push-pull electric proportional reversing valve is reversed to end b, and the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull oil cylinder. The hydraulic oil in the rodless cavity of the push-pull oil cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; the single push-pull oil cylinder retracts; Step (7.7). The K5 end of the power three-position four-way solenoid valve loses power; the hydraulic oil is input into the signal end of the first logic valve and the signal end of the second logic valve; the first logic valve and the second logic valve are switched; the oil ports between adjacent push-pull cylinders are connected; the hydraulic oil in adjacent push-pull cylinders maintains the same oil volume; multiple push-pull electric proportional reversing valves are switched to the b end, the hydraulic oil flows from the oil port P3 of the push-pull electric proportional reversing valve to the oil port A3 of the push-pull electric proportional reversing valve and then flows into the rod cavity of the push-pull cylinder, the hydraulic oil in the rodless cavity of the push-pull cylinder flows from the oil port B3 of the push-pull electric proportional reversing valve to the oil port T3 of the push-pull electric proportional reversing valve; multiple push-pull cylinders retract synchronously.

2. A method for controlling a hydraulic system of a blade mounting winch according to claim 1, characterized in that: Step (4) also includes: the hydraulic oil flowing out from the oil outlet of the first oil pump and the oil outlet of the second oil pump enters the high-pressure filter for filtration and then flows to the push-pull electric proportional reversing valve, the clamping three-position four-way solenoid valve, the locking three-position four-way solenoid valve and the power three-position four-way solenoid valve.

3. The control method of the hydraulic system of a blade mounting winch according to claim 1, characterized in that: After step (7.3) is completed, proceed to step (12); Step (12). Individually control the remaining push-pull cylinders to retract in sequence.

4. The control method of the hydraulic system of a blade mounting winch according to claim 1, characterized in that: After step (7.6) is completed, proceed to step (13); Step (13). Individually control the remaining push-pull cylinders to extend in sequence.

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