Mine hoist braking overheating prevention device based on gas-liquid composite cooling and control method

Abstract

The invention discloses a mine hoist anti-braking overheating device based on gas-liquid composite cooling and a control method.The mine hoist anti-braking overheating device comprises a brake disc water cooling assembly, a brake disc water cooling hydraulic system, an improved brake shoe and a brake shoe air cooling pneumatic system, and the brake disc water cooling assembly is used for conducting liquid cooling on a brake disc; the brake disc water cooling hydraulic system is used for providing cooling liquid for the brake disc water cooling assembly, an airflow channel is formed in the improved brake shoe and used for conducting air cooling on the improved brake shoe and a brake disc, and the brake shoe air cooling pneumatic system is used for providing cooling air for the improved brake shoe. The gas-liquid mixed cooling method is used for effectively reducing the brake heat production of the elevator, accurate control over the friction temperature of the brake disc and the brake shoe is achieved by controlling the displacement of the hydraulic pump and the opening of the gas path valve, the brake heat failure risk is reduced, and the brake safety of the mine elevator is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of brake cooling for mine hoists, and in particular to a brake overheating prevention device for mine hoists based on gas-liquid composite cooling and a control method thereof. Background Art

[0002] In mine operations, mine hoists, as critical transportation equipment connecting underground and the surface, are responsible for lifting personnel, equipment, and ore. The reliable operation of their braking systems is directly related to mine safety. Under frequent braking and heavy-load braking conditions, the disc brakes of mine hoists can experience a sharp rise in disc temperature due to frictional heat generation. This reduces the friction coefficient of the disc and brake shoe surfaces, diminishing the braking torque and severely impacting braking safety.

[0003] In the existing technology, conventional cooling methods have problems such as low heat dissipation efficiency and uneven temperature control, which makes it difficult to cope with the high heat load under the complex working conditions of mine hoists. When the gate disc temperature exceeds the critical threshold, it will not only cause the brake friction coefficient to decrease and the brake response to be delayed, but may also cause faults such as thermal deformation, cracks, and even burning of the gate disc, which seriously threatens the operational safety and reliability of the hoisting system, reduces the service life of the equipment, and increases operation and maintenance costs. Therefore, the development of an efficient and reliable mine hoist anti-brake overheating device and cooling method to achieve precise temperature control of the gate disc braking process has become a key technical issue that needs to be solved to ensure the safe and stable operation of the mine hoist. Summary of the Invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a mine hoist anti-brake overheating device and control method based on gas-liquid composite cooling.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a mine hoist brake overheating prevention device based on gas-liquid composite cooling, comprising a brake disc water-cooling component, a brake disc water-cooling hydraulic system, an improved brake shoe, and a brake shoe air-cooling pneumatic system. The brake disc water-cooling component is used to perform liquid cooling on the brake disc, and the brake disc water-cooling hydraulic system is used to provide cooling liquid for the brake disc water-cooling component. An air flow channel is provided inside the improved brake shoe for gas cooling of the improved brake shoe and the brake disc, and the brake shoe air-cooling pneumatic system is used to provide cooling air for the improved brake shoe. The cooling component includes a swivel joint, a bearing seat, a cooling water pipe, a gate disc, and a hoist drum; the inlet and outlet of the swivel joint are connected to the gate disc cooling hydraulic system; the bearing seat is used to support the entire hoist; a double-channel S-shaped cooling water channel is provided inside the gate disc; a straight-through inlet and outlet cooling water channel is provided inside the hoist drum, and the straight-through inlet and outlet cooling water channel is connected to the swivel joint; the cooling water pipe is arranged on the end faces on both sides of the hoist drum, and is used to connect the S-shaped cooling water channel of the gate disc and the straight-through cooling water channel of the hoist drum.

[0007] Preferably, the gate disc water-cooled hydraulic system includes a liquid storage tank, a cooler, a filter, a hydraulic pump, a servo motor, a one-way valve, a throttle valve, a flow meter, a thermometer, and a pressure gauge that are interconnected; the gate disc water-cooled hydraulic system controls the displacement of the hydraulic pump by controlling the voltage of the servo motor; the flow meter is connected in series with the hydraulic circuit of the gate disc water-cooled hydraulic system to monitor the flow of the hydraulic system, and the thermometer and pressure gauge are connected in parallel with the hydraulic circuit of the gate disc water-cooled hydraulic system to monitor the temperature and pressure of the hydraulic system; the liquid outlet of the liquid storage tank is connected to the hydraulic pump through a filter, a cooler is provided between the liquid outlet of the rotary joint and the liquid storage tank, and the liquid outlet of the hydraulic pump is connected to the throttle valve through a one-way valve.

[0008] Preferably, an overflow valve is provided between the one-way valve and the liquid storage tank.

[0009] Preferably, a cross-shaped channel is provided inside the improved brake shoe as a gas flow channel, and the air flow channel is connected to the brake shoe air-cooling pneumatic system.

[0010] Preferably, the friction surface of the improved brake shoe is a grooved friction surface, and the grooves of the grooved friction surface are evenly distributed with openings 1 connecting to the gas flow channel, and the side of the improved brake shoe is provided with opening 2 connecting to the gas flow channel for connecting to the brake shoe air-cooled pneumatic system.

[0011] Preferably, the brake shoe air-cooled pneumatic system includes an air storage tank, a second cooler, an air filter, a pneumatic pump, a second motor, a second one-way valve, an electromagnetic reversing valve, a proportional reversing valve, a second thermometer and a second pressure gauge; the P ports of several parallel proportional reversing valves are connected to the electromagnetic reversing valve, the T port of the proportional reversing valve is connected to the improved brake shoe opening two, the second thermometer and the second pressure gauge are connected in parallel to the pneumatic circuit of the brake shoe air-cooled pneumatic system for monitoring the temperature and pressure of the pneumatic system; the air outlet of the pneumatic pump is connected to the electromagnetic reversing valve through the second one-way valve, the air storage tank is connected to the pneumatic pump through the air filter, the pneumatic pump is connected to the second motor, and the air storage tank is connected to the second cooler.

[0012] Preferably, a second overflow valve is provided between the second one-way valve and the gas storage tank.

[0013] The present invention also provides a control method for the above-mentioned gas-liquid composite cooling-based mine hoist anti-brake overheating device, comprising the following steps:

[0014] Step S1: Detect the brake disc brake temperature threshold T through testing P ; Set the trigger temperature of the mine hoist anti-brake overheating device to the brake disc brake temperature threshold T P 80%;

[0015] Step S2: Installing an infrared temperature sensor on the disc brake to monitor the brake disc surface brake temperature T1 in real time during the braking process of the mine hoist;

[0016] Step S3: The gate disc is measured by the infrared temperature sensor to be more than 80% T P The temperature rise ΔT1 is used to calculate the heat dissipated by the brake disc Q = m·c·ΔT1;

[0017] Where m is the mass of the brake disc, c is the specific heat capacity of the brake disc;

[0018] Step S4: Calculate the control voltage V of the servo motor (105) driving the hydraulic pump (104) according to the heat Q of the brake disc and the temperature difference ΔT2 between the inlet and outlet of the coolant, as follows:

[0019] If T1≤80%T P , then V=0,

[0020] If T1>80%T P ,but

[0021] Where ρ is the coolant density, L is the hydraulic pump displacement, k v is the servo motor speed-voltage proportional coefficient, c p is the specific heat capacity of the coolant, ΔT2 is the temperature difference between the inlet and outlet of the coolant, η v is the volumetric efficiency of the hydraulic pump;

[0022] Step S5: According to the brake shoe surface temperature T w and the cooling gas temperature T gas Calculate the proportional reversing valve (409) spool opening D input value as follows:

[0023] If T1≤80%T P , then D=0,

[0024] If T1>80%T P ,but

[0025] Among them, D is the proportional valve core opening, A channel is the effective flow cross-sectional area of the cooling channel, K D is the flow coefficient, P in is the input thermal power, T w is the brake shoe surface temperature, T gas is the cooling gas temperature, h0 is the reference value of the heat transfer coefficient, A surface is the effective surface area for heat dissipation;

[0026] Step S6: adjusting the displacement of the hydraulic pump by controlling the servo motor control voltage V; adjusting the gas flow by controlling the valve core opening D of the proportional reversing valve;

[0027] Step S7: Real-time monitoring of the gate disc surface temperature. If the gate disc surface temperature is greater than 80% T P , then repeat steps S3-S6, if the gate disc surface temperature is less than 80% T P , then end the control.

[0028] Preferably, the trigger temperature of the mine hoist anti-brake overheating device is set to the brake disc brake temperature threshold T P 70% of.

[0029] The beneficial effects of the present invention are:

[0030] 1. The present invention adopts a gas-liquid mixed cooling method, which can effectively improve the heat dissipation efficiency during the braking process, accelerate the reduction of the friction surface temperature of the brake, and increase the service life of the equipment.

[0031] 2. The brake disc water cooling system and brake shoe air cooling system of the present invention operate independently and can serve as backup for each other. If the water cooling system fails, gas cooling can still maintain basic heat dissipation. At the same time, liquid cooling can provide continuous cooling when the gas supply is interrupted, avoiding the risk of brake failure caused by failure of a single system.

[0032] 3. The present invention can monitor the surface temperature of the gate disc in real time and automatically enter the cooling mode when the temperature exceeds the safety threshold, thereby enhancing the safety of mine hoist operation.

[0033] 4. The double-channel S-shaped cooling water channel inside the gate disc of the present invention can increase the contact area and flow rate, extend the cooling path, and at the same time, the double-channel design can reduce the radial temperature difference of the gate disc and improve the cooling efficiency; the brake shoe friction surface is a grooved friction surface, and air flow holes are evenly opened in the groove, so that the cooling gas of the pneumatic system acts on the brake friction surface through the internal air flow channel of the brake shoe, effectively reducing the temperature without affecting the braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of a gate disc water cooling system according to an embodiment of the present invention;

[0036] Figure 2 A partial cross-sectional view of a gate disc according to an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of a brake shoe air cooling system according to an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of an improved brake shoe structure according to an embodiment of the present invention;

[0039] Figure 5 A flow chart of a control system according to an embodiment of the present invention;

[0040] Figure: 1. Disk water-cooling hydraulic system; 101. Liquid storage tank; 102. Cooler; 103. Filter; 104. Hydraulic pump; 105. Servo motor; 106. Check valve; 107. Overflow valve; 108. Throttle valve; 109. Flow meter; 110. Thermometer; 111. Pressure gauge; 2. Disk water-cooling assembly; 201. Rotary joint; 202. Bearing seat; 203. Cooling water Pipe; 204, brake disc; 205, hoist drum; 206, S-shaped cooling water channel; 3, improved brake shoe; 4, brake shoe air-cooled pneumatic system; 401, air storage tank; 402, cooler 2; 403, overflow valve 2; 405, pneumatic pump; 406, motor 2; 407, one-way valve 2; 408, electromagnetic reversing valve; 409, proportional reversing valve; 410 thermometer 2; 411, pressure gauge 2. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example 1:

[0043] like Figure 1-5 As shown, this embodiment provides a mine hoist brake overheating prevention device and control method based on gas-liquid composite cooling.

[0044] A mine hoist brake overheating prevention device based on gas-liquid composite cooling includes a brake disc water-cooling component 2, a brake disc water-cooling hydraulic system 1, an improved brake shoe 3, and a brake shoe air-cooling pneumatic system 4. The brake disc water-cooling component 2 is used to liquid-cool the brake disc, and the brake disc water-cooling hydraulic system 1 is used to provide coolant for the brake disc water-cooling component 2. An air flow channel is provided inside the improved brake shoe 3 for gas cooling the improved brake shoe 3 and the brake disc, and the brake shoe air-cooling pneumatic system 4 is used to provide cooling air for the improved brake shoe 3.

[0045] The gate disc water cooling assembly 2 includes a rotary joint 201, a bearing seat 202, a cooling water pipe 203, a gate disc 204, and a hoist drum 205; the inlet and outlet of the rotary joint 201 are connected to the gate disc cooling hydraulic system 1; the bearing seat 202 is used to support the entire hoist; a double-channel S-shaped cooling water channel 206 is provided inside the gate disc 204; a straight-through inlet and outlet cooling water channel is provided inside the hoist drum 205, and the straight-through inlet and outlet cooling water channel is connected to the rotary joint 201; the cooling water pipe 203 is arranged on both side end faces of the hoist drum 205, and is used to connect the S-shaped cooling water channel 206 of the gate disc 204 and the straight-through cooling water channel of the hoist drum 205.

[0046] The gate disc water-cooling hydraulic system 1 includes a liquid storage tank 101, a cooler 102, a filter 103, a hydraulic pump 104, a servo motor 105, a one-way valve 106, a throttle valve 108, a flow meter 109, a thermometer 110, and a pressure gauge 111, which are interconnected. The gate disc water-cooling hydraulic system 1 controls the displacement of the hydraulic pump 104 by controlling the voltage of the servo motor 105. The flow meter 109 is connected in series to the hydraulic circuit of the gate disc water-cooling hydraulic system 1 to monitor the flow of the hydraulic system. The temperature gauge 110 and the pressure gauge 111 are connected in parallel to the hydraulic circuit of the gate disc water-cooled hydraulic system 1 to monitor the temperature and pressure of the hydraulic system; the liquid outlet of the liquid storage tank 101 is connected to the hydraulic pump 104 through a filter 103, and a cooler 102 is provided between the liquid outlet of the rotary joint 201 and the liquid storage tank 101. The liquid outlet of the hydraulic pump 104 is connected to the throttle valve 108 through a one-way valve 106, and an overflow valve 107 is provided between the one-way valve 106 and the liquid storage tank 101.

[0047] The improved brake shoe 3 is provided with a second opening on the side thereof, which is connected to the brake shoe air-cooling pneumatic system 4, and a cross-shaped channel is provided inside as a gas flow channel; the gas flow channel is connected to the second opening, and the friction surface of the improved brake shoe 3 is a grooved friction surface, and the grooves are evenly provided with first openings, which are connected to the internal gas flow channel. The cooling air can evenly act on the friction surface of the gate disc 204 and the improved brake shoe 3, reducing the friction surface temperature without affecting the friction efficiency.

[0048] The brake shoe air-cooled pneumatic system 4 includes an air storage tank 401, a cooler 402, an air filter 404, a pneumatic pump 405, a motor 406, a check valve 407, an electromagnetic reversing valve 408, a proportional reversing valve 409, a thermometer 410 and a pressure gauge 411; the P ports of several parallel proportional reversing valves 409 are connected to the electromagnetic reversing valve 408, the T ports of the proportional reversing valve 409 are connected to the opening 2 of the improved brake shoe 3, the thermometer 410 and the pressure gauge 411 are connected. 411 is connected in parallel to the pneumatic circuit of the brake shoe air-cooled pneumatic system 4 and is used to monitor the temperature and pressure of the pneumatic system; the air outlet of the pneumatic pump 405 is connected to the electromagnetic reversing valve 408 through a one-way valve 407, and the air tank 401 is connected to the pneumatic pump 405 through an air filter 404, and the pneumatic pump 405 is connected to a motor 406, and the air tank 401 is connected to a cooler 402; an overflow valve 403 is provided between the one-way valve 407 and the air tank 401.

[0049] In this embodiment, the liquid storage tank 101, cooler 102, filter 103, hydraulic pump 104, servo motor 105, one-way valve 106, relief valve 107, throttle valve 108, flow meter 109, thermometer 110, pressure gauge 111, rotary joint 201, bearing seat 202, cooling water pipe 203, gate disc 204, hoist drum 205, S-shaped cooling water channel 206, improved brake shoe 3, air storage tank 401, cooler 2 402, relief valve 2 403, pneumatic pump 405, motor 2 406, one-way valve 2 407, electromagnetic reversing valve 408, proportional reversing valve 409, thermometer 2 410, and pressure gauge 2 411 all adopt existing products or structures well known to those skilled in the art, and the connection methods among them also adopt existing connection methods well known to those skilled in the art.

[0050] The brake disc water-cooling hydraulic system (1) and the brake shoe air-cooling pneumatic system (4) of this embodiment are controlled by a circuit control system well known to those skilled in the art.

[0051] The working principle of the mine hoist brake overheating prevention device based on gas-liquid composite cooling in this embodiment is as follows:

[0052] When the surface temperature of the gate disc 204 rises, exceeding 80% of the set threshold, the gate disc water cooling system begins to operate. The servo motor 105 drives the hydraulic pump 104, and the coolant flows through the filter 103, the one-way valve 106, and the throttle valve 108 to the liquid inlet of the rotary joint 201. The coolant then flows through the cooling water pipe 203 and the direct cooling water channel 205 inside the hoist drum to act on the S-shaped cooling water channel inside the gate disc 204, forming a circular loop. During the coolant circulation, the coolant absorbs the heat generated by friction. The coolant passes through the return port of the rotary joint 201, is cooled by the cooler 402, and then returns to the liquid storage tank. Simultaneously, the brake shoe air-cooled pneumatic system also operates. The cooling gas passes through the one-way valve 407 and the solenoid reversing valve 408, and the proportional reversing valve 409 adjusts the gas flow by adjusting the opening size. The cooling gas acts on the brake friction surface through the internal air flow channel of the brake shoe 3.

[0053] A control method for a mine hoist anti-brake overheating device based on gas-liquid composite cooling in this embodiment is specifically as follows:

[0054] Step S1: Detect the brake disc brake temperature threshold T by a test method well known to those skilled in the art. P ;

[0055] Step S2: Installing an infrared temperature sensor on the disc brake to monitor the brake disc surface brake temperature T1 in real time during the braking process of the mine hoist; the disc brake and infrared temperature sensor are conventional products or structures well known to those skilled in the art, and are connected to each other using conventional connection methods well known to those skilled in the art;

[0056] Step S3: The gate disc is measured by the infrared temperature sensor to be more than 80% T P The temperature rise ΔT1 of the brake disc is used to calculate the heat generated by the brake disc Q = m·c·ΔT1;

[0057] Where m is the mass of the brake disc, c is the specific heat capacity of the brake disc;

[0058] Step S4: The control voltage V of the servo motor 105 driving the hydraulic pump 104 is obtained according to the heat Q of the brake disc and the temperature difference ΔT2 of the coolant inlet and outlet. The temperature difference ΔT2 of the coolant inlet and outlet is obtained by the signal measured by the temperature meter (110). The specific calculation formula of the control voltage V is as follows:

[0059] If T1≤80%T P , then V=0,

[0060] If T1>80%T P ,but

[0061] Where ρ is the coolant density, L is the hydraulic pump displacement, k v is the servo motor speed-voltage proportional coefficient, c p is the specific heat capacity of the coolant, ΔT2 is the temperature difference between the inlet and outlet of the coolant, η v is the volumetric efficiency of the hydraulic pump;

[0062] Step S5: According to the brake shoe surface temperature T w and the cooling gas temperature T gas The input value of the valve core opening D of the proportional reversing valve 409 is obtained as follows:

[0063] If T1≤80%T P , then D=0,

[0064] If T1>80%T P ,but

[0065] Among them, D is the valve core opening of proportional reversing valve 409, A channel is the effective flow cross-sectional area of the cooling channel, K D is the flow coefficient, P in is the input thermal power, T w is the brake shoe surface temperature, T gas Cooling gas temperature, h0 heat transfer coefficient reference value, A surface is the effective surface area for heat dissipation;

[0066] Step S6: adjusting the displacement of the hydraulic pump by controlling the servo motor control voltage V; adjusting the gas flow by controlling the valve core opening D of the proportional reversing valve 409;

[0067] Step S6: Real-time monitoring of the surface temperature of the gate disc 204. If the surface temperature of the gate disc 204 is greater than 80% of T P , then repeat steps S3-S6. If the surface temperature of the gate disk 204 is less than 80% T P , then end the control;

[0068] This embodiment adopts a gas-liquid mixed cooling method, which can effectively improve the heat dissipation efficiency during braking, accelerate the reduction of the friction surface temperature of the brake, and increase the service life of the equipment; the brake disc water cooling system and the brake shoe air cooling system of this embodiment operate independently and can serve as backup for each other. If the water cooling system fails, gas cooling can still maintain basic heat dissipation. At the same time, liquid cooling can provide continuous cooling when the gas supply is interrupted, avoiding the risk of brake failure caused by failure of a single system; this embodiment can monitor the surface temperature of the brake disc in real time, and automatically enter the cooling mode when the temperature exceeds the safety threshold, which can enhance the operating safety of the mine hoist; the dual-channel S-shaped cooling water channel inside the gate disc of this embodiment can increase the contact area and flow, extend the cooling path, and the dual-channel design can reduce the radial temperature difference of the gate disc and improve the cooling efficiency; the brake shoe friction surface is a grooved friction surface, and air flow holes are evenly opened in the groove, so that the cooling gas of the pneumatic system acts on the brake friction surface through the air flow channel inside the brake shoe, effectively cooling without affecting the braking effect.

[0069] Example 2:

[0070] The difference between this embodiment and embodiment 1 is that the triggering temperature of the mine hoist brake overheating prevention device is set to 70% of the brake disc brake temperature threshold.

[0071] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A mine hoist anti-brake overheating device based on gas-liquid composite cooling, characterized in that: The invention comprises a brake disc water cooling assembly (2), a brake disc water cooling hydraulic system (1), an improved brake shoe (3), and a brake shoe air cooling pneumatic system (4), wherein the brake disc water cooling assembly (2) is used for liquid cooling of the brake disc, the brake disc water cooling hydraulic system (1) is used for providing cooling liquid for the brake disc water cooling assembly (2), an air flow channel is provided inside the improved brake shoe (3) for gas cooling of the improved brake shoe (3) and the brake disc, the brake shoe air cooling pneumatic system (4) is used for providing cooling air for the improved brake shoe (3), the brake disc water cooling assembly (2) comprises a rotary joint (201), a bearing seat (202), a cooling water pipe (203), a brake disc (2 04), hoist drum (205); the inlet and outlet of the rotary joint (201) are connected to the gate disc cooling hydraulic system (1); the bearing seat (202) is used to support the entire hoist; a double-channel S-shaped cooling water channel (206) is provided inside the gate disc (204); a straight-through inlet and outlet cooling water channel is provided inside the hoist drum (205), and the straight-through inlet and outlet cooling water channel is connected to the rotary joint (201); the cooling water pipe (203) is arranged on both side end faces of the hoist drum (205) and is used to connect the S-shaped cooling water channel (206) of the gate disc (204) and the straight-through cooling water channel of the hoist drum (205).

2. The anti-brake overheating device for a mine hoist based on gas-liquid composite cooling according to claim 1 is characterized in that: The gate disc water-cooling hydraulic system (1) comprises a liquid storage tank (101), a cooler (102), a filter (103), a hydraulic pump (104), a servo motor (105), a one-way valve (106), a throttle valve (108), a flow meter (109), a temperature gauge (110), and a pressure gauge (111) which are interconnected. The gate disc water-cooling hydraulic system (1) controls the displacement of the hydraulic pump (104) by controlling the voltage of the servo motor (105). The flow meter (109) is connected in series to the gate disc water-cooling hydraulic system (1). The hydraulic circuit is used to monitor the flow of the hydraulic system; the temperature gauge (110) and the pressure gauge (111) are connected in parallel to the hydraulic circuit of the gate disc water-cooled hydraulic system (1) to monitor the temperature and pressure of the hydraulic system; the liquid outlet of the liquid storage tank (101) is connected to the hydraulic pump (104) through a filter (103); a cooler (102) is provided between the liquid outlet of the rotary joint (201) and the liquid storage tank (101); and the liquid outlet of the hydraulic pump (104) is connected to a throttle valve (108) through a one-way valve (106).

3. The anti-brake overheating device for a mine hoist based on gas-liquid composite cooling according to claim 2 is characterized in that: An overflow valve (107) is provided between the one-way valve (106) and the liquid storage tank (101).

4. The anti-brake overheating device for a mine hoist based on gas-liquid composite cooling according to claim 1 is characterized in that: The improved brake shoe (3) is provided with a cross-shaped channel inside as a gas flow channel, and the gas flow channel is connected to the brake shoe air-cooling pneumatic system (4).

5. The anti-brake overheating device for a mine hoist based on gas-liquid composite cooling according to claim 4 is characterized in that: The friction surface of the improved brake shoe (3) is a grooved friction surface, and the grooves of the grooved friction surface are evenly provided with openings 1 for connecting to the gas flow channel. The side of the improved brake shoe (3) is provided with openings 2 for connecting to the gas flow channel for connecting to the brake shoe air-cooled pneumatic system (4).

6. The anti-brake overheating device for a mine hoist based on gas-liquid composite cooling according to claim 5, characterized in that: The brake shoe air-cooled pneumatic system (4) comprises an air storage tank (401), a cooler (402), an air filter (404), a pneumatic pump (405), a motor (406), a check valve (407), an electromagnetic reversing valve (408), a proportional reversing valve (409), a temperature gauge (410) and a pressure gauge (411); the P ports of a plurality of parallel proportional reversing valves (409) are connected to the electromagnetic reversing valve (408), and the T ports of the proportional reversing valves (409) are connected to the openings of the improved brake shoe (3). The second temperature gauge (410) and the second pressure gauge (411) are connected in parallel to the pneumatic circuit of the brake shoe air-cooled pneumatic system (4) to monitor the temperature and pressure of the pneumatic system; the air outlet of the pneumatic pump (405) is connected to the electromagnetic reversing valve (408) through the second one-way valve (407), the air storage tank (401) is connected to the pneumatic pump (405) through the air filter (404), the pneumatic pump (405) is connected to the second motor (406), and the air storage tank (401) is connected to the second cooler (402).

7. The anti-brake overheating device for a mine hoist based on gas-liquid composite cooling according to claim 6, characterized in that: A second overflow valve (403) is provided between the second one-way valve (407) and the gas storage tank (401).

8. A control method for a mine hoist anti-brake overheating device based on gas-liquid composite cooling according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1: Detect the brake disc brake temperature threshold T through testing P ; Set the trigger temperature of the mine hoist anti-brake overheating device to the brake disc brake temperature threshold T P 80%; Step S2: Installing an infrared temperature sensor on the disc brake to monitor the brake disc surface brake temperature T1 in real time during the braking process of the mine hoist; Step S3: The gate disc is measured by the infrared temperature sensor to be more than 80% T P The temperature rise ΔT1 of the brake disc is used to calculate the heat generated by the brake disc Q = m·c·ΔT1; Where m is the mass of the brake disc, c is the specific heat capacity of the brake disc; Step S4: Calculate the control voltage V of the servo motor (105) driving the hydraulic pump (104) according to the heat Q of the brake disc and the temperature difference ΔT2 between the inlet and outlet of the coolant, as follows: If T1≤80%T P , then V=0, If T1>80%T P ,but Where ρ is the coolant density, L is the hydraulic pump displacement, k v is the servo motor speed-voltage proportional coefficient, c p is the specific heat capacity of the coolant, ΔT2 is the temperature difference between the inlet and outlet of the coolant, η v is the volumetric efficiency of the hydraulic pump; Step S5: According to the brake shoe surface temperature T w and the cooling gas temperature T gas Calculate the proportional reversing valve (409) spool opening D input value as follows: If T1≤80%T P , then D=0, If T1>80%T P ,but Wherein, D is the valve core opening of proportional reversing valve (409), A channel is the effective flow cross-sectional area of the cooling channel, K D is the flow coefficient, P in is the input thermal power, T w is the brake shoe surface temperature, T gas is the cooling gas temperature, h0 is the reference value of the heat transfer coefficient, A surface is the effective surface area for heat dissipation; Step S6: adjusting the displacement of the hydraulic pump by controlling the servo motor control voltage V; adjusting the gas flow by controlling the valve core opening D of the proportional reversing valve; Step S7: Real-time monitoring of the gate disc surface temperature. If the gate disc surface temperature is greater than 80% T P , then repeat steps S3-S6, if the gate disc surface temperature is less than 80% T P , then end the control.

9. The control method of the mine hoist anti-brake overheating device based on gas-liquid composite cooling according to claim 8, characterized in that: Set the trigger temperature of the mine hoist anti-brake overheating device to the brake disc brake temperature threshold T P 70% of.

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