Brake control system and control method thereof

Abstract

A brake control system, the brake control system includes oil tank, main pump, motor, proportional overflow valve, check valve, one two-position four-way electromagnetic reversing valve, two two-position four-way electromagnetic reversing valve, two-position four-way hydraulic reversing valve, brake spring oil cylinder, winch, clutch and emergency pump; The oil inlet end of the main pump communicates with the oil outlet end of the oil tank, the main pump is drivenly connected with the motor, the oil outlet end of the main pump communicates with the oil inlet end of the check valve, the oil outlet end of the check valve communicates with the P port of the one two-position four-way electromagnetic reversing valve, the B port of the one two-position four-way electromagnetic reversing valve communicates 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 communicates with the rodless cavity of the brake spring oil cylinder; The rodless cavity of the brake spring oil cylinder communicates with the B port of the two two-position four-way electromagnetic reversing valve, and the T port of the two two-position four-way electromagnetic reversing valve communicates with the oil tank. The design can carry out emergency braking when the conventional brake fails.

Description

TECHNICAL FIELD

[0001] The present application relates to an improvement of the oil cylinder brake control technology, belonging to the brake control system field, in particular to a brake control system and a control method thereof. BACKGROUND

[0002] With the continuous development and utilization of resources, traditional equipment needs to be applied in emerging fields, and higher requirements for the safety and reliability of the equipment are put forward. For example: the winch suitable for offshore cable winding is applied to the coal mine hoisting system to pull the mine car from the bottom of the mine to the top of the stockyard; in order to ensure the normal operation of the winch, and to quickly brake and emergency release in emergency working conditions, the traditional winch control system samples conventional valve for control, which cannot adjust the braking torque of the winch, and the emergency protection function cannot be implemented. In the case of valve failure and winch overspeed, it cannot brake normally, which cannot meet the high safety and reliability requirements of the winch.

[0003] The Chinese patent application with application number CN202210596432.8 and application date May 30, 2022 discloses a locomotive brake control system and control method. The locomotive brake control system includes a brake cylinder control system, an average pipe control system, and a conversion plug door. When the conversion plug door is in the on position, if the locomotive brake control system is powered off or fails or is in the no-power return mode, the average pipe control system outputs the average pipe pressure according to the mechanical distribution valve pressure, and the brake cylinder control system outputs the brake cylinder pressure according to the mechanical distribution valve pressure and the average pipe pressure. When the conversion plug door is in the cut-off position, if the locomotive brake control system is powered off or fails, the brake cylinder control system outputs the brake cylinder pressure according to the mechanical distribution valve pressure and the average pipe pressure from the host locomotive. Through the brake control system, the brake release consistency between the host locomotive and the coupled locomotive is improved, and the stability and safety of train operation are enhanced. However, the comparative document still does not solve the problem of emergency braking when the conventional brake fails.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the general background of the present patent application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known in the field. SUMMARY

[0005] The purpose of the present application is to overcome the problem of emergency braking when the conventional brake fails in the prior art, and to provide a brake control system and a control method thereof that can perform emergency braking when the conventional brake fails.

[0006] In order to achieve the above object, the technical solution of the present application is: a brake control system, comprising an oil tank, a main pump, a motor, a proportional overflow valve, a one-way valve, a one-two four-way electromagnetic reversing valve, a two-two four-way electromagnetic reversing valve, a two-way four-way hydraulic reversing valve, a brake spring oil cylinder, a winch, a clutch and an emergency pump;

[0007] The oil inlet end of the main pump is communicated with the oil outlet end of the oil tank, the main pump is drivingly connected with the motor, the oil outlet end of the main pump is communicated with the oil inlet end of the one-way valve, the oil outlet end of the one-way valve is communicated with the P port of the one-two four-way electromagnetic reversing valve, the B port of the one-two four-way electromagnetic reversing valve is communicated with the P port of the two-way four-way hydraulic reversing valve, and the A port of the two-way four-way hydraulic reversing valve is communicated with the rodless cavity of the brake spring oil cylinder.

[0008] The rodless cavity of the brake spring oil cylinder is communicated with the B port of the two-two four-way electromagnetic reversing valve, and the T port of the two-two four-way electromagnetic reversing valve is communicated with the oil tank.

[0009] The T port of the one-two four-way electromagnetic reversing valve and the T port of the two-way four-way hydraulic reversing valve are communicated with the oil tank.

[0010] The winch and the clutch are respectively connected with the emergency pump, the oil inlet end of the emergency pump is communicated with the oil outlet end of the oil tank, and the oil outlet end of the emergency pump is communicated with the X port of the two-way four-way hydraulic reversing valve.

[0011] A transmission shaft is arranged on the winch, and two transmission shafts are arranged on the emergency pump.

[0012] The oil outlet end of the one-way valve is communicated with the oil inlet end of a pressure gauge and an accumulator.

[0013] A pressure sensor is mounted on the pressure gauge.

[0014] The oil inlet end of the pressure sensor is communicated with the oil inlet end of the one-way valve.

[0015] The oil outlet end of the accumulator is communicated with the P port of the one-two four-way electromagnetic reversing valve, the B port of the one-two four-way electromagnetic reversing valve is communicated with the P port of the two-way four-way hydraulic reversing valve, and the A port of the two-way four-way hydraulic reversing valve is communicated with the rodless cavity of the brake spring oil cylinder.

[0016] The oil outlet end of the pressure gauge is communicated with the P port of the one-two four-way electromagnetic reversing valve, the B port of the one-two four-way electromagnetic reversing valve is communicated with the P port of the two-way four-way hydraulic reversing valve, and the A port of the two-way four-way hydraulic reversing valve is communicated with the rodless cavity of the brake spring oil cylinder.

[0017] The oil circuit between the main pump and the one-way valve is communicated with the P port of the proportional overflow valve, and the T port of the proportional overflow valve is communicated with the oil tank.

[0018] The first transmission shaft is connected with the emergency pump, and the second transmission shaft is connected with the first transmission shaft to drive the emergency pump to operate.

[0019] The brake control system and the brake method thereof include normal braking and emergency braking:

[0020] The normal braking refers to: when the winch stops operating, first control the two-position four-way electromagnetic reversing valve and the two-position four-way electromagnetic reversing valve to lose electricity, and control the motor to stop operating, then the pressure oil in the rodless cavity of the brake spring oil cylinder flows through the A port of the two-position four-way hydraulic reversing valve, the P port of the two-position four-way hydraulic reversing valve, the B port of the two-position four-way electromagnetic reversing valve, and the T port of the two-position four-way electromagnetic reversing valve in sequence, and finally flows back to the oil tank, and at the same time, the pressure oil in the rodless cavity of the brake spring oil cylinder also flows back to the oil tank after flowing through the B port of the two-position four-way electromagnetic reversing valve and the T port of the two-position four-way electromagnetic reversing valve in sequence;

[0021] The emergency braking refers to: when the winch speed sensor detects that the winch is overspeed, the electric control driving clutch is closed, at this time, the second transmission shaft of the emergency pump is driven to operate through the first transmission shaft of the winch, so as to drive the emergency pump to operate and provide the hydraulic power for the reversing of the two-position four-way hydraulic reversing valve, at this time, the two-position four-way hydraulic reversing valve is operated from the right position to the left position, the pressure oil in the rodless cavity of the brake spring oil cylinder flows back to the oil tank after flowing through the A port of the two-position four-way hydraulic reversing valve and the T port of the two-position four-way hydraulic reversing valve in sequence, and at the same time, the pressure oil in the rodless cavity of the brake spring oil cylinder also flows back to the oil tank after flowing through the B port of the two-position four-way electromagnetic reversing valve and the T port of the two-position four-way electromagnetic reversing valve, so that the pressure is released, and the emergency braking is completed.

[0022] After the emergency braking is completed, the speed of the winch is reduced to zero, at this time, the emergency pump has no power source input, and cannot provide power for the reversing of the two-position four-way hydraulic reversing valve, the B port to the T port of the two-position four-way hydraulic reversing valve returns to the normal state, the clutch is disengaged, and the conventional braking state is restored.

[0023] Compared with the prior art, the brake control system and the brake method thereof have the following beneficial effects:

[0024] 1. In the brake control system and the brake method thereof, the winch and the clutch are connected with the emergency pump, the oil inlet end of the emergency pump is communicated with the oil outlet end of the oil tank, the oil outlet end of the emergency pump is communicated with the X port of the two-position four-way hydraulic reversing valve, in the case that the winch is overspeed, all electrical elements are controlled to stop working, at the same time, the clutch is driven to quickly close the driving shaft of the emergency pump, the two-position four-way hydraulic reversing valve is driven to work, the pressure oil in the rodless cavity of the brake spring oil cylinder is released and flows back to the oil tank, the emergency braking of the brake is completed, and the emergency braking can be performed when the conventional braking fails. Therefore, the emergency braking can be performed, and the safety in use is high.

[0025] 2. In the braking control system and method of this invention, the oil circuit between the main pump and the check valve is connected to the P port of the proportional relief valve, and the T port of the proportional relief valve is connected to the oil tank. The current signal controlling the proportional relief valve controls the output pressure of the control system, and the pressurized oil is delivered to the rodless chamber of the brake spring cylinder through the main pump to adjust the braking torque. Therefore, this design can adjust the winch braking torque and ensure stable operation.

[0026] 3. In the braking control system and method of this invention, when the winch stops running, the control motor stops operating, all solenoid valves are de-energized, and the pressure oil in the rodless chamber of the brake spring cylinder is released and flows back to the oil tank, completing the braking. Therefore, this design can quickly achieve parking braking with a rapid response. Attached Figure Description

[0027] Fig. 1 This is a system schematic diagram of the present invention.

[0028] Fig. 2 This is a diagram showing the hydraulic circuit routing for normal braking in this invention.

[0029] Fig. 3 This is a diagram showing the hydraulic circuit layout for emergency braking in this invention.

[0030] In the diagram: 1. Oil tank; 2. Main pump; 3. Motor; 4. Proportional relief valve; 5. Check valve; 6. Pressure gauge; 7. Pressure sensor; 8. Accumulator; 9. One- or two-position four-way solenoid directional valve; 10. Two- or two-position four-way solenoid directional valve; 11. Two-position four-way hydraulic directional valve; 12. Brake spring cylinder; 12. Rodless chamber; 13. Winch; 14. Clutch; 15. Emergency pump; 16. First drive shaft; 17. Second drive shaft. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] See Figs. 1 to 3 A braking control system includes an oil tank 1, a main pump 2, a motor 3, a proportional relief valve 4, a check valve 5, a one- or two-position four-way solenoid directional valve 9, a two- or two-position four-way solenoid directional valve 10, a two-position four-way hydraulic directional valve 11, a brake spring cylinder 12, a winch 13, a clutch 14, and an emergency pump 15.

[0033] The oil inlet of the main pump 2 is connected to the oil outlet of the oil tank 1. The main pump 2 is driven by the motor 3. The oil outlet of the main pump 2 is connected to the oil inlet of the check valve 5. The oil outlet of the check valve 5 is connected to the P port of the one- or two-position four-way solenoid directional valve 9. The B port of the one- or two-position four-way solenoid directional valve 9 is connected to the P port of the two-position four-way hydraulic directional valve 11. The A port of the two-position four-way hydraulic directional valve 11 is connected to the rodless chamber 121 of the brake spring cylinder 12.

[0034] The rodless cavity 121 of the brake spring oil cylinder 12 is communicated with the B port of the two-position four-way electromagnetic reversing valve 10, and the T port of the two-position four-way electromagnetic reversing valve 10 is communicated with the oil tank 1.

[0035] The T port of the one-position four-way electromagnetic reversing valve 9 and the T port of the two-position four-way hydraulic reversing valve 11 are communicated with the oil tank 1.

[0036] The winch 13 and the clutch 14 are respectively connected with the emergency pump 15, the oil inlet end of the emergency pump 15 is communicated with the oil outlet end of the oil tank 1, and the oil outlet end of the emergency pump 15 is communicated with the X port of the two-position four-way hydraulic reversing valve 11.

[0037] A transmission shaft 16 is arranged on the winch 13, and two transmission shafts 17 are arranged on the emergency pump 15.

[0038] The oil outlet end of the one-way valve 5 is respectively communicated with the pressure gauge 6 and the oil inlet end of the accumulator 8.

[0039] The pressure sensor 7 is installed on the pressure gauge 6.

[0040] The oil inlet end of the pressure sensor 7 is communicated with the oil inlet end of the one-way valve 5.

[0041] The oil outlet end of the accumulator 8 is communicated with the P port of the one-position four-way electromagnetic reversing valve 9, the B port of the one-position four-way electromagnetic reversing valve 9 is communicated with the P port of the two-position four-way hydraulic reversing valve 11, and the A port of the two-position four-way hydraulic reversing valve 11 is communicated with the rodless cavity 121 of the brake spring oil cylinder 12.

[0042] The oil outlet end of the pressure gauge 6 is communicated with the P port of the one-position four-way electromagnetic reversing valve 9, the B port of the one-position four-way electromagnetic reversing valve 9 is communicated with the P port of the two-position four-way hydraulic reversing valve 11, and the A port of the two-position four-way hydraulic reversing valve 11 is communicated with the rodless cavity 121 of the brake spring oil cylinder 12.

[0043] The oil circuit between the main pump 2 and the one-way valve 5 is communicated with the P port of the proportional overflow valve 4, and the T port of the proportional overflow valve 4 is communicated with the oil tank 1.

[0044] The one transmission shaft 16 is connected with the emergency pump 15, and the two transmission shafts 17 are connected with the one transmission shaft 16 to drive the emergency pump 15 to operate.

[0045] A brake method of a brake control system, the brake method of the brake control system comprises normal braking and emergency braking:

[0046] The normal braking refers to: when the winch 13 stops running, first control a two-position four-way electromagnetic reversing valve 9 and a two-position four-way electromagnetic reversing valve 10 lose power, control the motor 3 to stop running, then the pressure oil in the rodless cavity 121 of the brake spring oil cylinder 12 flows through the A port of the two-position four-way hydraulic reversing valve 11, the P port of the two-position four-way hydraulic reversing valve 11, the B port of the two-position four-way electromagnetic reversing valve 9, and the T port of the two-position four-way electromagnetic reversing valve 9 in turn, and finally flows back to the oil tank 1, and the pressure oil in the rodless cavity 121 of the brake spring oil cylinder 12 also flows back to the oil tank 1 after flowing through the B port of the two-position four-way electromagnetic reversing valve 10 and the T port of the two-position four-way electromagnetic reversing valve 10 in turn;

[0047] The emergency braking refers to: when the winch 13 speed sensor detects that its speed is too high, the electric control driving clutch 14 is closed, at this time, the two drive shafts 17 of the emergency pump 15 are driven to run through a drive shaft 16 of the winch 13, to drive the emergency pump 15 to run, and provide hydraulic power for the two-position four-way hydraulic reversing valve 11, at this time, the two-position four-way hydraulic reversing valve 11 is operated from the right position to the left position, the pressure oil in the rodless cavity 121 of the brake spring oil cylinder 12 flows back to the oil tank 1 after flowing through the A port of the two-position four-way hydraulic reversing valve 11 and the T port of the two-position four-way hydraulic reversing valve 11 in turn, and the pressure oil in the rodless cavity 121 of the brake spring oil cylinder 12 also flows back to the oil tank 1 from the B port of the two-position four-way electromagnetic reversing valve 10 and the T port of the two-position four-way electromagnetic reversing valve 10, to release the pressure, and complete the emergency braking.

[0048] After the emergency braking is completed, the speed of the winch 13 is reduced to zero, at this time, the emergency pump 15 has no power source input, and cannot provide power for the reversing of the two-position four-way hydraulic reversing valve 11, the B port to the T port of the two-position four-way hydraulic reversing valve 11 returns to the normal state, the clutch 14 is disengaged, and returns to the normal braking state.

[0049] Example 1:

[0050] A brake control system, the brake control system comprising an oil tank 1, a main pump 2, a motor 3, a proportional overflow valve 4, a one-two four-way electromagnetic reversing valve 9, a two-two four-way electromagnetic reversing valve 10, a two-way four-way hydraulic reversing valve 11, a brake spring oil cylinder 12, a winch 13, a clutch 14 and an emergency pump 15; the oil inlet end of the main pump 2 is in communication with the oil outlet end of the oil tank 1, the main pump 2 is drivingly connected with the motor 3, the oil outlet end of the main pump 2 is in communication with the oil inlet end of the one-way valve 5, the oil outlet end of the one-way valve 5 is in communication with the P port of the one-two four-way electromagnetic reversing valve 9, the B port of the one-two four-way electromagnetic reversing valve 9 is in communication with the P port of the two-way four-way hydraulic reversing valve 11, and the A port of the two-way four-way hydraulic reversing valve 11 is in communication with the rodless cavity 121 of the brake spring oil cylinder 12; the rodless cavity 121 of the brake spring oil cylinder 12 is in communication with the B port of the two-two four-way electromagnetic reversing valve 10, and the T port of the two-two four-way electromagnetic reversing valve 10 is in communication with the oil tank 1; the T port of the one-two four-way electromagnetic reversing valve 9 and the T port of the two-way four-way hydraulic reversing valve 11 are in communication with the oil tank 1; the winch 13 and the clutch 14 are respectively connected with the emergency pump 15, the oil inlet end of the emergency pump 15 is in communication with the oil outlet end of the oil tank 1, and the oil outlet end of the emergency pump 15 is in communication with the X port of the two-way four-way hydraulic reversing valve 11; a transmission shaft 16 is arranged on the winch 13, and two transmission shafts 17 are arranged on the emergency pump 15.

[0051] A brake method of a brake control system, the brake method of the brake control system comprising normal braking and emergency braking:

[0052] The normal braking refers to: when the winch 13 stops running, first control the one-two four-way electromagnetic reversing valve 9 to lose power and the two-two four-way electromagnetic reversing valve 10 to lose power, and control the motor 3 to stop running, then the pressure oil in the rodless cavity 121 of the brake spring oil cylinder 12 flows through the A port of the two-way four-way hydraulic reversing valve 11, the P port of the two-way four-way hydraulic reversing valve 11, the B port of the one-two four-way electromagnetic reversing valve 9 and the T port of the one-two four-way electromagnetic reversing valve 9 in turn, and finally flows back to the oil tank 1, and at the same time, the pressure oil in the rodless cavity 121 of the brake spring oil cylinder 12 also flows back to the oil tank 1 after flowing through the B port of the two-two four-way electromagnetic reversing valve 10 and the T port of the two-two four-way electromagnetic reversing valve 10 in turn;

[0053] The emergency brake refers to: when the speed sensor of winch 13 detects that it appears overspeed, the electric control driving clutch 14 is closed, at this time the two driving shafts 17 of emergency pump 15 are driven to run through a driving shaft 16 of winch 13, to drive emergency pump 15 to run, to provide the reversing hydraulic power for two-position four-way hydraulic reversing valve 11, at this time two-position four-way hydraulic reversing valve 11 is operated from right position to left position, the pressure oil of rodless cavity 121 of brake spring oil cylinder 12 flows back to oil tank 1 through A port of two-position four-way hydraulic reversing valve 11 and T port of two-position four-way hydraulic reversing valve 11 in turn, at the same time, the pressure oil of rodless cavity 121 of brake spring oil cylinder 12 also flows back to oil tank 1 from B port of two two-position four-way electromagnetic reversing valve 10 and T port of two two-position four-way electromagnetic reversing valve 10, to release the pressure, to complete the emergency brake.

[0054] Embodiment 2:

[0055] Embodiment 2 is basically the same as embodiment 1, the difference is that:

[0056] A brake control system, the oil outlet of the check valve 5 is communicated with the pressure gauge 6 and the inlet of the accumulator 8 respectively; the pressure sensor 7 is installed on the pressure gauge 6; the oil outlet of the accumulator 8 is communicated with the P port of a two-position four-way electromagnetic reversing valve 9, the B port of the two-position four-way electromagnetic reversing valve 9 is communicated with the P port of the two-position four-way hydraulic reversing valve 11, and the A port of the two-position four-way hydraulic reversing valve 11 is communicated with the rodless cavity 121 of the brake spring oil cylinder 12; the oil outlet of the pressure gauge 6 is communicated with the P port of a two-position four-way electromagnetic reversing valve 9, the B port of the two-position four-way electromagnetic reversing valve 9 is communicated with the P port of the two-position four-way hydraulic reversing valve 11, and the A port of the two-position four-way hydraulic reversing valve 11 is communicated with the rodless cavity 121 of the brake spring oil cylinder 12; the oil circuit between the main pump 2 and the check valve 5 is communicated with the P port of the proportional overflow valve 4, and the T port of the proportional overflow valve 4 is communicated with the oil tank 1; the driving shaft 16 is connected with the emergency pump 15, and the two driving shafts 17 are connected with the driving shaft 16 to drive the emergency pump 15 to run.

[0057] The brake release principle is as follows: when the PLC program receives the brake release signal, the electromagnet of the two two-position four-way electromagnetic reversing valve 10 is electrified, the oil in the rodless cavity 121 of the brake spring oil cylinder 12 is isolated from the oil circuit of the oil tank 1; at the same time, the current signal of the proportional overflow valve 4 is given to the maximum value, and the electromagnetic valve of the two-position four-way electromagnetic reversing valve 9 is electrified; the motor 3 is started to drive the main pump 2, the high pressure oil of the main pump 2 enters the rodless cavity 121 of the brake spring oil cylinder 12 through the check valve 5, the two-position four-way electromagnetic reversing valve 9 and the two-position four-way hydraulic reversing valve 11, to drive the brake spring oil cylinder 12 piston rod to extend, to completely open the brake;

[0058] At this time, the high pressure oil of the main pump 2 enters the accumulator 8 at the same time, when the pressure sensor 7 detects that the pressure reaches the design value, the motor 3 stops running, and the accumulator 8 provides the opening pressure oil for the brake spring oil cylinder 12; but when the detection pressure sensor 7 is lower than the design value, the motor 3 is started again, and the main pump 2 drives the accumulator 8 to charge pressure, and the pressure reaches the set value, and the motor 3 stops running, the control process can greatly reduce the running time of the motor 3, and the energy-saving and emission-reducing effect is achieved.

[0059] Embodiment 3:

[0060] Embodiment 3 is basically the same as embodiment 1, and the difference is that:

[0061] A brake control system, when the pressure sensor 7 fails, the pressure of the rodless cavity 121 entering the brake spring oil cylinder 12 can be observed through the pressure gauge 6, when the winch 13 needs to release in emergency with the brake force, according to the requirements of different brake torques, the PLC controls the current signal value of the proportional overflow valve 4, adjusts the pressure of the rodless cavity 121 entering the brake spring oil cylinder 12, completes the adjustment of the brake torque, completes the emergency release of the winch, and improves the safety of the system.

[0062] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments, but any equivalent modifications or changes made by those skilled in the art according to the disclosed content of the present application shall be included in the protection scope recorded in the claims.

Claims

1. A braking control method for a braking control system, characterized in that... The braking control system includes an oil tank (1), a main pump (2), a motor (3), a proportional relief valve (4), a check valve (5), a first two-position four-way solenoid directional valve (9), a second two-position four-way solenoid directional valve (10), a two-position four-way hydraulic directional valve (11), a brake spring cylinder (12), a winch (13), a clutch (14), and an emergency pump (15). The oil inlet of the main pump (2) is connected to the oil outlet of the oil tank (1). The main pump (2) is driven by the motor (3). The oil outlet of the main pump (2) is connected to the oil inlet of the check valve (5). The oil outlet of the check valve (5) is connected to the P port of the first two-position four-way solenoid directional valve (9). The B port of the first two-position four-way solenoid directional valve (9) is connected to the P port of the two-position four-way hydraulic directional valve (11). The A port of the two-position four-way hydraulic directional valve (11) is connected to the rodless chamber of the brake spring cylinder (12). The rodless chamber of the brake spring cylinder (12) is connected to the B port of the second two-position four-way solenoid valve (10), and the T port of the second two-position four-way solenoid valve (10) is connected to the oil tank (1). The T port of the first two-position four-way solenoid directional valve (9) and the T port of the two-position four-way hydraulic directional valve (11) are connected to the oil tank (1); The winch (13) and clutch (14) are respectively connected to the emergency pump (15). The oil inlet of the emergency pump (15) is connected to the oil outlet of the oil tank (1). The oil outlet of the emergency pump (15) is connected to the X port of the two-position four-way hydraulic directional valve (11). The winch (13) is equipped with a drive shaft (16), and the emergency pump (15) is equipped with two drive shafts (17). The braking control method includes normal braking and emergency braking: The normal braking refers to the following: when the winch (13) stops running, the first two-position four-way solenoid valve (9) and the second two-position four-way solenoid valve (10) are de-energized, and the motor (3) is stopped running. Then, the pressure oil in the rodless chamber (121) of the brake spring cylinder (12) flows sequentially through the A port of the two-position four-way hydraulic valve (11), the P port of the two-position four-way hydraulic valve (11), the B port of the two-position four-way solenoid valve (9), and the T port of the two-position four-way solenoid valve (9), and finally flows back to the oil tank (1). At the same time, the pressure oil in the rodless chamber (121) of the brake spring cylinder (12) also flows sequentially through the B port of the second two-position four-way solenoid valve (10) and the T port of the second two-position four-way solenoid valve (10), and then flows back to the oil tank (1). The emergency braking refers to the following: when the speed sensor of the winch (13) detects that it is overspeeding, the electronically controlled drive clutch (14) closes. At this time, the first drive shaft (16) of the winch (13) drives the second drive shaft (17) of the emergency pump (15) to run, so as to drive the emergency pump (15) to run and provide hydraulic power for the two-position four-way hydraulic directional valve (11) to switch. At this time, the two-position four-way hydraulic directional valve (11) runs from the right position to the left position. The pressure oil in the rodless chamber (121) of the brake spring cylinder (12) flows back to the oil tank (1) after passing through the A port and the T port of the two-position four-way hydraulic directional valve (11) in sequence. At the same time, the pressure oil in the rodless chamber (121) of the brake spring cylinder (12) also flows back to the oil tank (1) from the B port and the T port of the second two-position four-way electromagnetic directional valve (10), releasing its pressure and completing the emergency braking.

2. The braking control method according to claim 1, characterized in that: The oil outlet of the one-way valve (5) is connected to the oil inlet of the pressure gauge (6) and the accumulator (8), respectively.

3. The braking control method according to claim 2, characterized in that: A pressure sensor (7) is installed on the pressure gauge (6).

4. The braking control method according to claim 3, characterized in that: The oil inlet of the pressure sensor (7) is connected to the oil inlet of the check valve (5).

5. The braking control method according to claim 2, characterized in that: The oil outlet of the accumulator (8) is connected to the P port of the first two-position four-way solenoid directional valve (9), the B port of the first two-position four-way solenoid directional valve (9) is connected to the P port of the two-position four-way hydraulic directional valve (11), and the A port of the two-position four-way hydraulic directional valve (11) is connected to the rodless chamber (121) of the brake spring cylinder (12).

6. The braking control method according to claim 2, characterized in that: The oil outlet of the pressure gauge (6) is connected to the P port of the first two-position four-way solenoid directional valve (9), the B port of the first two-position four-way solenoid directional valve (9) is connected to the P port of the two-position four-way hydraulic directional valve (11), and the A port of the two-position four-way hydraulic directional valve (11) is connected to the rodless chamber (121) of the brake spring cylinder (12).

7. The braking control method according to claim 1, characterized in that: The oil circuit between the main pump (2) and the check valve (5) is connected to the P port of the proportional relief valve (4), and the T port of the proportional relief valve (4) is connected to the oil tank (1).

8. The braking control method according to claim 1, characterized in that: The first drive shaft (16) is connected to the emergency pump (15), and the second drive shaft (17) is connected to the first drive shaft (16) to drive the emergency pump (15) to run.

9. The braking control method according to claim 1, characterized in that: After the emergency braking is completed, the speed of the winch (13) drops to zero. At this time, the emergency pump (15) has no power source input and cannot provide power for the switching of the two-position four-way hydraulic directional valve (11). The B port to T port channel of the two-position four-way hydraulic directional valve (11) returns to the normal state, disengages the clutch (14), and returns to the normal braking state.

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