Control method of brake valve block

Abstract

The invention provides a control method of a brake valve block, the brake valve block is used for controlling brake of a winch, the brake valve block comprises the winch, a brake device connected with the winch, an oil way communication device, a one-way valve, a two-way valve, an oil inlet and an oil tank, the oil way communication device comprises a first electromagnetic valve and a second electromagnetic valve, a steel wire rope is wound on the winch, and the steel wire rope is connected with a hoisted object; the system is simple to operate and reliable to control, so that the safety of on-site operators is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of crane hydraulic control, and in particular to a control method for a brake valve block. Background Art

[0002] Nowadays, winches are needed in cranes to lift heavy objects, and the control of winches is generally achieved through hydraulic control. With the continuous development and utilization of resources, the application of hydraulic control technology is increasingly used in the process of resource collection, such as the winches of offshore cranes for retracting and releasing cables, and the traction mine cars used in coal mine development. The rotation of the winch and the movement of the mine car are all achieved by hydraulic control. In order to improve the safety of emergency braking when the conventional brake of the winch fails, such as the Chinese patent application number 202310249356.8 and the publication date 2023.07.07, the patent document discloses a brake control system and a control method thereof. The brake control system includes a fuel tank, a main pump, a motor, Proportional relief valve, one-way valve, one-position four-way solenoid reversing valve, two-position four-way solenoid reversing valve, two-position four-way hydraulic reversing valve, brake spring cylinder, winch, clutch and emergency pump; the oil inlet end of the main pump is connected with the oil outlet end of the oil tank, the main pump is connected to the motor drive, the oil outlet end of the main pump is connected with the oil inlet end of the one-way valve, the oil outlet end of the one-way valve is connected with the P port of the one-position four-way solenoid reversing valve, the B port of the one-position four-way solenoid reversing valve is connected with the P port of the two-position four-way hydraulic reversing valve, the A port of the two-position four-way hydraulic reversing valve is connected with the rodless cavity of the brake spring cylinder; the rodless cavity of the brake spring cylinder is connected with the B port of the two-position four-way solenoid reversing valve, and the T port of the two-position four-way solenoid reversing valve is connected with the oil tank.

[0003] According to the above document, after energizing any one of the two two-position four-way solenoid reversing valves connected in parallel, the liquid oil in the oil tank can flow through the two-position four-way solenoid reversing valve to the rodless chamber to open the brake of the winch; in order to prevent the failure of the four-way solenoid reversing valve, it is necessary to add an emergency brake solenoid reversing valve, which makes the entire braking operation complicated. If one of the four-way solenoid reversing valves fails, it is also necessary to additionally start the emergency brake valve for braking, which makes the operation complicated and the control method complicated. Summary of the invention

[0004] The object of the present invention is to provide a control method for a brake valve block, which is simple to operate and reliable in control, thereby ensuring the safety of on-site operators.

[0005] To achieve the above object, a control method of a brake valve block is provided for controlling the brake of a winch, comprising a winch, a brake device connected to the winch, an oil circuit connecting device, a one-way valve, a two-way valve, an oil inlet and an oil tank, wherein the oil circuit connecting device comprises a first solenoid valve and a second solenoid valve, a steel wire rope is wound around the winch, and the steel wire rope is connected to the hoisting object; The following steps are also included: S1 connects the external oil pump to the oil inlet, opens the pressure reducing valve, and reduces the oil pressure of the external oil after it flows through the pressure reducing valve to within the tolerance range of the brake device; S2 energizes the solenoid valve 1 and the solenoid valve 2 at the same time, so that the oil after the pressure reduction by the pressure reducing valve flows through the solenoid valve 1 and the solenoid valve 2 in sequence; S3 divides the oil flowing through the second solenoid valve into the first oil circuit and the second oil circuit. The first oil circuit flows to one end of the two-way valve, so that the second oil circuit flows through the one-way valve to be divided into the third oil circuit and the fourth oil circuit. The third oil circuit flows to the other end of the two-way valve, so that the oil pressure at both ends of the two-way valve is equal, and then the fourth oil circuit flows to the brake device; The S4 brake device releases the brake on the winch, allowing the winch to work normally and drive the hoisted object to move up or down through the wire rope; After the hoisted object reaches the target position, S5 cuts off the power to the solenoid valve 1 or the solenoid valve 2, causing the oil pressure of the first oil circuit connected to the solenoid valve 2 to drop instantly, forming an oil pressure difference at both ends of the two-way valve, so that the liquid oil in the third oil circuit and the fourth oil circuit flows back into the two-way valve, and then flows back to the oil tank through the two-way valve; The S6 brake device brakes the winch to stop it from rotating, thereby stopping the hoisted object at the target position.

[0006] The above arrangement, firstly, sets the liquid oil to pass through the pressure reducing valve, so that the oil pressure of the liquid oil can be reduced to the range that the brake device can withstand, thereby preventing the high-pressure liquid oil from causing damage to the brake device; since the solenoid valve one and the solenoid valve two are connected in series, it is necessary to energize the two solenoid valves at the same time so that the liquid oil flowing through the pressure reducing valve can be connected with the solenoid valve, and then flow to the one-way valve through the solenoid valve; and the first oil circuit, the second oil circuit, the third oil circuit and the fourth oil circuit are set so that after the liquid oil flows through the one-way valve, the oil pressure at both ends of the one-way valve is still equal after the liquid oil passes through the two-way valve, and then flows to the brake device through the fourth oil circuit. The brake of the winch is released by the device; and when any solenoid valve loses power, the fourth oil circuit connected to the brake device and the third oil circuit can form a two-way valve that converges into the same oil circuit and has an oil pressure greater than the oil pressure of the first oil circuit connected to the two-way valve, and then the liquid oil in the oil circuit connected to the brake device flows back to the tank through the two-way valve to brake the winch; in this process, since solenoid valve 1 and solenoid valve 2 are connected in series, the brake can only be released when the two solenoid valves are energized and switched at the same time, which effectively avoids the brake release caused by accidentally touching a single solenoid switch in the control oil circuit, thereby ensuring the safety of on-site operators.

[0007] Further, the P1 valve port of the solenoid valve one is connected to the oil inlet, the A1 valve port of the solenoid valve one is conductively connected to the P2 valve port of the solenoid valve two, the A2 valve port of the solenoid valve two is respectively connected to the input end of the one-way valve and the upper end of the two-way valve, the output end of the one-way valve is respectively connected to the lower end of the two-way valve and the brake device, the T1 valve port of the solenoid valve one, the T2 valve port of the solenoid valve two and the B valve port of the two-way valve are all connected to the oil tank, and the brake device is released when the one-way valve inputs the oil circuit to the brake device; In step S2, the liquid oil after being decompressed by the pressure reducing valve flows into the P1 valve port of the first solenoid valve, and after the first solenoid valve is energized, flows out from the A1 valve port of the first solenoid valve, and then flows to the P2 valve port of the second solenoid valve, and after the second solenoid valve is energized, flows out from the A2 valve port of the second solenoid valve; In step S5, after the solenoid valve 1 or the solenoid valve 2 is powered off, the liquid oil flows back to the oil tank through the valve port T1 of the solenoid valve 1 and the valve port T2 of the solenoid valve 2.

[0008] The above arrangement is arranged by connecting solenoid valve one and solenoid valve two in series. In this way, when controlling the liquid oil to release the brake of the brake device, it is necessary to control solenoid valve one and solenoid valve two to be energized at the same time, so that solenoid valve one and solenoid valve two can be turned on at the same time, so that the liquid oil passing through the pressure reducing valve can flow through solenoid valve one and solenoid valve two to the one-way valve, and a two-way valve is arranged to be connected to both ends of the one-way valve, so that the oil pressure of the liquid oil flowing through both ends of the one-way valve is equal, and then the liquid oil flows to the brake device to release the brake; and after any solenoid valve loses power, the oil pressure of the oil circuit connected to the brake device can be greater than the oil pressure of the two-way valve, and then the liquid oil in the oil circuit connected to the brake device flows back to the oil tank through the two-way valve, thereby achieving braking.

[0009] Furthermore, the brake device includes an oil storage tank, a spring, a piston and a brake block, one end of the spring is fixed to the bottom of the oil storage tank, the other end of the spring is fixedly connected to one end of a piston arranged in the oil storage tank, the other end of the piston is fixedly connected to the brake block, the brake block abuts against the rotating shaft of the winch, the piston divides the interior of the oil storage tank into an upper oil storage chamber and a lower oil storage chamber, and the upper oil storage chamber is connected to the output end of the one-way valve; In step S4, the fourth oil circuit fluid pushes the piston to compress the spring 1, thereby driving the brake block to separate from the rotating shaft of the winch, so that the winch rotates normally; In step S6, the oil pressure of the fourth oil circuit is reduced, and the piston is driven to move in the opposite direction under the action of the spring 1, thereby driving the brake block to abut against the rotating shaft of the winch, so that the winch stops rotating.

[0010] The above arrangement allows the oil to flow directly into the upper oil storage chamber through the one-way valve when the winch brake needs to be released, thereby exerting a downward force on the piston to compress spring 1, thereby driving the piston to move downward, causing the brake block to disengage from the winch shaft and releasing the brake.

[0011] Furthermore, a spring 2 and a connecting block are provided inside the two-way valve, one end of the spring 2 is fixedly connected to the top of the two-way valve, and the other end of the spring 2 is fixedly connected to the connecting block, and the connecting block divides the interior of the two-way valve into a first chamber and a second chamber.

[0012] With the above arrangement, after the liquid oil flows into the two-way valve, it can push the connecting block to compress or stretch the second spring, thereby adjusting the oil pressure of the oil circuit connected to the brake device.

[0013] Furthermore, a valve port B is provided on one side of the first chamber, the valve port B is connected to the oil tank, the output end of the one-way valve is connected to the upper end of the first chamber, and the lower end of the second chamber is connected to the output end of the one-way valve; In step S3, the first oil circuit is connected to the second chamber, the third oil circuit is connected to the first chamber, and the liquid oil in the first oil circuit pushes the connecting block to move toward the first chamber to block the valve port B. Then, the connecting block is in a balanced state in the two-way valve under the action of the first oil circuit and the third oil circuit.

[0014] According to the above arrangement, when braking is not needed, the oil pressure passing through both ends of the one-way valve can be equal by connecting the second chamber to the output end of the one-way valve and the output end of the one-way valve to the first chamber, so that the liquid oil passing through the one-way valve directly flows into the upper oil storage chamber, exerting a downward force on the piston to compress the spring 1, thereby driving the piston to move downward, so that the brake block is separated from the winch shaft and the brake is released; when braking is needed, after disconnecting one of the solenoid valves 1 and 2, the oil pressure in the second chamber connected to the input end of the one-way valve is reduced, so that the oil pressure in the first chamber is greater than the oil pressure in the second chamber, and then the connecting block is pushed to move upward to compress the spring 2, and the liquid oil in the first chamber flows out from the B valve port, thereby reducing the oil pressure in the first chamber, so that the hydraulic pressure in the upper oil storage chamber is greater than the oil pressure in the first chamber, so that the liquid oil in the upper oil storage chamber flows into the first chamber through the oil path under the action of the spring 1, and then flows back to the oil tank through the B valve port, and then the spring 1 pushes the piston to move upward, so that the brake block abuts against the winch shaft to achieve braking.

[0015] Furthermore, one end of the pressure reducing valve is connected to the oil inlet, and the other end of the pressure reducing valve is connected to the P1 valve port of the solenoid valve 1.

[0016] The above arrangement facilitates adjusting the external oil pressure to within the oil pressure range that the brake device can withstand through the pressure reducing valve.

[0017] Furthermore, the solenoid valve 1 and the solenoid valve 2 are both two-position three-way valves.

[0018] The above settings can conveniently realize the connection between the input and output ends by controlling the P port. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the structural connection of the present invention.

[0020] Figure 2 for Figure 1 Enlarged view of point D in the middle.

[0021] Figure 3 for Figure 1 Enlarged view of point E in the middle.

[0022] Figure 4 for Figure 1 Enlarged view of point F in the middle.

[0023] Figure 5 It is the work flow chart of the present invention. DETAILED DESCRIPTION

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

[0025] like Figures 1 to 4 As shown, a control method for a brake valve block includes a winch 1, a brake device connected to the winch 1, an oil circuit connecting device, a two-way valve 6, an oil inlet 9 and an oil tank 10, wherein the brake device is connected to one end of the oil circuit connecting device and one end of the two-way valve 6 respectively through a one-way valve 111, the other end of the oil circuit connecting device is connected to the oil inlet 9 through a pressure reducing valve 8, and the other end of the two-way valve 6 is connected to the oil tank 10.

[0026] like Figure 1 As shown, the oil circuit connecting device includes a solenoid valve 1 71 and a solenoid valve 2 72, the solenoid valve 1 71 and the solenoid valve 2 72 are connected in series, one end of the pressure reducing valve 8 is connected to the oil inlet 9, the other end of the pressure reducing valve 8 is connected to the P1 valve port of the solenoid valve 1 71, and the A1 valve port of the solenoid valve 1 71 is connected to the P2 valve port of the solenoid valve 2 72 to achieve a series connection, so that the two solenoid valves need to be energized at the same time to allow the liquid oil passing through the pressure reducing valve 8 to pass through the two solenoid valves, otherwise the liquid oil passing through the pressure reducing valve 8 cannot be connected to the brake device through the solenoid valve 1 71 and the solenoid valve 2 72 to open the brake. In this embodiment, the solenoid valve 1 and the solenoid valve 2 are both two-position three-way valves.

[0027] like Figure 2-4As shown, when the one-way valve inputs the oil circuit to the brake device, the brake device is released. The brake device includes an oil storage tank 4, a spring 51, a piston 5 and a brake block 3. One end of the spring 51 is fixed to the bottom of the oil storage tank 4, and the other end of the spring 51 is fixedly connected to one end of the piston 5 arranged in the oil storage tank 4. The other end of the piston 5 is fixedly connected to the brake block 3. The brake block 3 abuts against the rotating shaft 2 of the winch 1. The piston 5 divides the interior of the oil storage tank 4 into an upper oil storage chamber 41 and a lower oil storage chamber 42. The upper oil storage chamber 41 is connected to the output end of the one-way valve. A spring 52 and a connecting block 7 are arranged inside the two-way valve 6. , one end of the spring 2 52 is fixedly connected to the top of the two-way valve 6, and the other end of the spring 2 52 is fixedly connected to the connecting block 7, and the connecting block 7 divides the interior of the two-way valve 6 into a first chamber 61 and a second chamber 62. A valve port B is provided on one side of the first chamber 61, and the valve port B is connected to the oil tank 10. The output end of the one-way valve 111 is connected to the upper end of the first chamber 61, and the lower end of the second chamber 62 is respectively connected to the input end of the one-way valve and the A2 valve port of the solenoid valve 2, and the T1 valve port of the solenoid valve 1 71, the T2 valve port of the solenoid valve 2 72 and the B valve port of the two-way valve 6 are all connected to the oil tank 10; in this way, there is no need When braking is required, by connecting the second chamber 62 to the input end of the one-way valve 111 and the output end of the one-way valve 111 to the first chamber 61, the oil pressure at both ends of the one-way valve 111 can be equal, so that the liquid oil passing through the one-way valve 111 directly flows into the upper oil storage chamber 41, exerting a downward force on the piston 5 to compress the spring 1 51, thereby driving the piston 5 to move downward, so that the brake block 3 is separated from the rotating shaft 2 of the winch 1, and the brake is released; when braking is required, after disconnecting one of the solenoid valve 1 71 and the solenoid valve 2 72, the second chamber connected to the input end of the one-way valve 111 is The oil pressure in the first chamber 61 is reduced, so that the oil pressure in the second chamber 62 is greater than that in the first chamber 61, thereby pushing the connecting block 7 upward to compress the spring 2 52, and the liquid oil in the first chamber 61 flows out from the valve port B, thereby reducing the oil pressure in the first chamber 61, so that the oil pressure in the upper oil storage chamber 41 is greater than that in the first chamber 61, so that the liquid oil in the upper oil storage chamber 41 flows into the first chamber 61 through the oil path under the action of the spring 1 51, and then flows back to the oil tank 10 through the valve port B, and then the spring 1 51 pushes the piston 5 upward to make the brake block 3 abut against the rotating shaft 2 of the winch 1 to achieve braking. In this embodiment, the oil inlet 9 is connected to an external oil pump (not shown in the figure).

[0028] It also includes the following specific steps, such as Figure 5 As shown, S1 connects the external oil pump to the oil inlet 9, opens the pressure reducing valve 8, and reduces the oil pressure of the external oil after flowing through the pressure reducing valve 8 to within the tolerance range of the brake device.

[0029] S2 energizes the solenoid valve 1 71 and the solenoid valve 2 72 at the same time, so that the liquid oil after the pressure reduction by the pressure reducing valve 8 flows into the solenoid valve 1 72 from the P1 valve port of the solenoid valve 1 72, then flows out from the A1 valve port of the solenoid valve 1 72, then flows to the P2 valve port of the solenoid valve 2 73, and finally flows out from the A2 valve port of the solenoid valve 2 73.

[0030] S3 divides the liquid oil after flowing through the solenoid valve 2 73 into the first oil circuit 11 and the second oil circuit 22. The first oil circuit 11 flows to one end of the two-way valve 6 and is connected to the second chamber 62. Then, the second oil circuit 22 flows through the one-way valve 111 and is divided into the third oil circuit 33 and the fourth oil circuit 44. The third oil circuit 33 flows to the other end of the two-way valve 6 and is connected to the first chamber 61. The liquid oil of the first oil circuit 11 pushes the connecting block 7 to move toward the first chamber 61 to block the valve port B. Then, the connecting block 7 is in a balanced state in the two-way valve 6 under the action of the first oil circuit 11 and the third oil circuit 33, so that the oil pressure at both ends of the two-way valve 6 is equal. Then, the fourth oil circuit 44 flows to the brake device. S4 brake device releases the brake on the winch 1. In this embodiment, the fourth oil circuit 44 fluid pushes the piston 5 to compress the spring 1 51, thereby driving the brake block 3 to separate from the rotating shaft 2 of the winch 1, so that the winch 1 rotates normally, and drives the hoisted object to move upward or downward through the wire rope (not marked in the figure); After the hoisted object reaches the target position, S5 cuts off the power to the electromagnetic valve 1 71 or the electromagnetic valve 2 72, causing the oil pressure of the first oil circuit 11 connected to the electromagnetic valve 2 72 to drop instantly, forming an oil pressure difference at both ends of the two-way valve 6, so that the liquid oil in the third oil circuit 33 and the fourth oil circuit 44 flows back into the two-way valve 6 and pushes the connecting block 7 to move in the opposite direction to open the valve port B, and then flows back to the oil tank 10 through the valve port B, and then the liquid oil in the electromagnetic valve 1 71 and the electromagnetic valve 2 72 flows back to the oil tank through the valve port T1 of the electromagnetic valve 1 71 and the valve port T2 of the electromagnetic valve 2 72 respectively; The S6 brake device brakes the winch 1. In this embodiment, the oil pressure of the fourth oil circuit 44 is reduced, and the piston 5 is driven to move in the opposite direction under the action of the spring 1 51, thereby driving the brake block 3 to abut against the rotating shaft 2 of the winch 1, so that the winch 1 stops rotating, and the hoisted object is stopped at the target position.

[0031] Working principle of the present invention: when the brake needs to work, the liquid oil flows through the oil inlet 9 through the pressure reducing valve 8, and the oil pressure of the liquid oil is adjusted to the bearing range of the brake device, and then the liquid oil flows into the solenoid valve 1 71, so that the solenoid valve 1 71 and the solenoid valve 2 72 are energized at the same time, so that the solenoid valve 1 71 and the solenoid valve 2 72 are connected in series, and the liquid oil flows to the one-way valve 111 through the solenoid valve 1 71 and the solenoid valve 2 72 in turn, and at the same time flows to the two-way valve 6 through the oil branch path. The two ends of the two-way valve 6 are respectively connected to the two ends of the one-way valve 11, so that the oil pressure of the liquid oil flowing through the two ends of the one-way valve 111 is equal, so that the liquid oil flows to the brake device, and the oil pressure of the upper oil storage chamber 41 of the oil storage tank 4 in the brake device is increased, so that the spring 1 51 in the oil storage tank 4 is pressed downward, and the piston 5 drives the brake block 3 downward. Move, thereby releasing the brake, and the winch 1 works normally; when the brake needs to stop working, either the solenoid valve 1 71 or the solenoid valve 2 72 is powered off or both are powered off at the same time, so that the oil pressure in the second chamber 62 connected to the A2 valve port of the solenoid valve 2 72 can be reduced, so that the oil pressure in the first chamber 61 is greater than the oil pressure in the second chamber 62, pushing the connecting block 7 to move upward to compress the spring 2 52, and the liquid oil in the first chamber 61 flows out from the B valve port, thereby reducing the oil pressure in the first chamber 61, and the oil pressure of the brake device is greater than the oil pressure in the first chamber 61, so that the liquid oil of the brake device flows into the first chamber 61 through the oil circuit, and then flows back to the oil tank 10 through the B valve port, finally reducing the oil pressure of the brake device, so that the brake block 3 abuts against the rotating shaft 2 of the winch 1, achieving braking.

Claims

1. A control method of a brake valve block, used for controlling the brake of a winch, comprising a winch, a brake device connected to the winch, an oil circuit connecting device, a one-way valve, a two-way valve, an oil inlet and an oil tank, wherein the oil circuit connecting device comprises a first solenoid valve and a second solenoid valve, a steel wire rope is wound around the winch, and the steel wire rope is connected to the hoisting object; Features: The following steps are also included: S1 connects the external oil pump to the oil inlet, opens the pressure reducing valve, and reduces the oil pressure of the external oil after it flows through the pressure reducing valve to within the tolerance range of the brake device; S2 energizes the solenoid valve 1 and the solenoid valve 2 at the same time, so that the oil after the pressure reduction by the pressure reducing valve flows through the solenoid valve 1 and the solenoid valve 2 in sequence; S3 divides the oil flowing through the second solenoid valve into the first oil circuit and the second oil circuit. The first oil circuit flows to one end of the two-way valve, so that the second oil circuit flows through the one-way valve to be divided into the third oil circuit and the fourth oil circuit. The third oil circuit flows to the other end of the two-way valve, so that the oil pressure at both ends of the two-way valve is equal, and then the fourth oil circuit flows to the brake device; The S4 brake device releases the brake on the winch, allowing the winch to work normally and drive the hoisted object to move up or down through the wire rope; After the hoisted object reaches the target position, S5 cuts off the power to the solenoid valve 1 or the solenoid valve 2, causing the oil pressure of the first oil circuit connected to the solenoid valve 2 to drop instantly, forming an oil pressure difference at both ends of the two-way valve, so that the liquid oil in the third oil circuit and the fourth oil circuit flows back into the two-way valve, and then flows back to the oil tank through the two-way valve; The S6 brake device brakes the winch to stop it from rotating, thereby stopping the hoisted object at the target position.

2. A method for controlling a brake valve block according to claim 1, Features: The P1 valve port of the solenoid valve 1 is connected to the oil inlet, the A1 valve port of the solenoid valve 1 is conductively connected to the P2 valve port of the solenoid valve 2, the A2 valve port of the solenoid valve 2 is respectively connected to the input end of the one-way valve and the upper end of the two-way valve, the output end of the one-way valve is respectively connected to the lower end of the two-way valve and the brake device, and the T1 valve port of the solenoid valve 1, the T2 valve port of the solenoid valve 2 and the B valve port of the two-way valve are all connected to the oil tank; In step S2, the liquid oil after being decompressed by the pressure reducing valve flows into the P1 valve port of the first solenoid valve, and after the first solenoid valve is energized, flows out from the A1 valve port of the first solenoid valve, and then flows to the P2 valve port of the second solenoid valve, and after the second solenoid valve is energized, flows out from the A2 valve port of the second solenoid valve; In step S5, after the solenoid valve 1 or the solenoid valve 2 is powered off, the liquid oil flows back to the oil tank through the valve port T1 of the solenoid valve 1 and the valve port T2 of the solenoid valve 2.

3. A method for controlling a brake valve block according to claim 1, Features: The brake device comprises an oil storage tank, a spring, a piston and a brake block, one end of the spring is fixed to the bottom of the oil storage tank, the other end of the spring is fixedly connected to one end of a piston arranged in the oil storage tank, the other end of the piston is fixedly connected to the brake block, the brake block abuts against the rotating shaft of the winch, the piston divides the interior of the oil storage tank into an upper oil storage chamber and a lower oil storage chamber, and the upper oil storage chamber is connected to the output end of the one-way valve; In step S4, the fourth oil circuit fluid pushes the piston to compress the spring 1, thereby driving the brake block to separate from the rotating shaft of the winch, so that the winch rotates normally; In step S6, the oil pressure of the fourth oil circuit is reduced, and the piston is driven to move in the opposite direction under the action of the spring 1, thereby driving the brake block to abut against the rotating shaft of the winch, so that the winch stops rotating.

4. A method for controlling a brake valve block according to claim 1, Features: A spring 2 and a connecting block are provided inside the two-way valve. One end of the spring 2 is fixedly connected to the top of the two-way valve, and the other end of the spring 2 is fixedly connected to the connecting block. The connecting block divides the inside of the two-way valve into a first chamber and a second chamber.

5. A method for controlling a brake valve block according to claim 4, Features: A valve port B is provided on one side of the first chamber, the valve port B is connected to the oil tank, the output end of the one-way valve is connected to the upper end of the first chamber, and the lower end of the second chamber is connected to the input end of the one-way valve; In step S3, the first oil circuit is connected to the second chamber, the third oil circuit is connected to the first chamber, and the liquid oil in the first oil circuit pushes the connecting block to move toward the first chamber to block the valve port B. Then, the connecting block is in a balanced state in the two-way valve under the action of the first oil circuit and the third oil circuit.

6. A method for controlling a brake valve block according to claim 1, Features: One end of the pressure reducing valve is connected to the oil inlet, and the other end of the pressure reducing valve is connected to the P1 valve port of the solenoid valve 1.

7. A method for controlling a brake valve block according to claim 2, Features: The solenoid valve 1 and the solenoid valve 2 are both two-position three-way valves.

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