A heat dissipation system and control method for underground coal mining and conveying equipment

Abstract

This invention relates to the field of heat dissipation technology in underground coal mines, specifically to a heat dissipation system and control method for an underground coal mining and conveying device. The system includes a circulating pump, a radiator, an external water source, a liquid storage tank, a replenishment tank, a recovery pump, and multiple three-way valves. The inlet of the circulating pump is connected to the outlet of the heating element of the coal mining and conveying device. The outlet of the circulating pump is connected to the inlet of the radiator, and the outlet of the radiator is connected to the inlet of the heating element. The external water source is connected to the inlet of the heating element. Multiple three-way valves are installed on pipelines connected to the inlet and outlet of the heating element to switch the connection between the circulating pump, radiator, external water source, liquid storage tank, replenishment tank, and the heating element. This system eliminates the need for external water consumption and does not discharge water, thus avoiding water waste and reducing environmental damage and pollution to the working face.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation technology in underground coal mines, specifically to a heat dissipation system and control method for an underground coal mining and conveying device. Background Technology

[0002] With the widespread adoption of mechanization and automation in underground coal mining technology, underground coal mining faces have basically achieved integrated coal mining and transportation. At the same time, air-cooled systems can no longer meet the heat dissipation requirements of their own motors and reducers. Currently, the industry mainly uses open-type cooling water jackets for heat dissipation: cooling water is introduced from the outside, carries away the heat, and is then directly discharged into the current environment. The main advantages of open-type water jacket cooling include: utilizing the advantages of liquid's high specific heat capacity and density, the heat dissipation effect is significantly improved compared to air-cooling. However, its disadvantages are also very prominent: it heavily relies on external low-temperature water sources. The cooling water is discharged directly to the working surface after flowing out of the conveying device, which not only seriously consumes water resources but also causes problems such as high moisture content in raw coal and difficulty in transportation and screening, bringing certain safety hazards. In addition, impurities and pollution contained in external cooling water can also damage the equipment itself to a certain extent.

[0003] Meanwhile, Chinese patent authorization announcement number CN223310168U discloses a heat dissipation system for a coal mining and conveying device in underground coal mines. However, the system is large in size, and its use is limited in some underground working faces due to insufficient space. In addition, due to the large amount of coal dust underground, the radiator is prone to clogging and requires frequent cleaning. Furthermore, since the underground working face is located hundreds of meters underground, in case of an emergency, if maintenance cannot be carried out in time, the machine must be shut down, which affects the efficiency of coal mining. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a heat dissipation system and control method for underground coal mining and conveying devices, so as to improve heat dissipation efficiency and coal mining efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a heat dissipation system for an underground coal mining and conveying device, comprising: a circulating pump, a radiator, an external water source, a liquid storage tank, a replenishment tank, a recovery pump, and multiple three-way valves;

[0007] The inlet of the circulating pump is connected to the outlet of the heating component of the coal conveying device, and the outlet of the circulating pump is connected to the inlet of the radiator.

[0008] The outlet of the radiator is used to connect to the inlet of the heating element, and the external water source is used to connect to the inlet of the heating element.

[0009] The liquid storage tank is used to connect to the outlet of the heating element;

[0010] The replenishment water tank is used to connect to the inlet of the heating element;

[0011] The recovery pump is connected between the liquid storage tank and the external water source;

[0012] Multiple three-way valves are installed on the pipelines connected to the inlet and outlet of the heating element, and are used to switch the connection between the circulating pump, radiator, external water source, liquid storage tank and replenishment tank and the heating element.

[0013] In some embodiments, it also includes a main circuit, an emergency recovery circuit, and a replenishment circuit;

[0014] The plurality of three-way valves include two main three-way valves and two bypass three-way valves, used to switch the connection of the main circuit, the emergency recovery circuit and the replenishment circuit.

[0015] In some embodiments, the two main three-way valves include a first main three-way valve and a second main three-way valve, wherein the first main three-way valve is disposed between the outlet of the circulating pump, the inlet of the radiator and the pipeline for connecting to the outlet of the heating element, and the second main three-way valve is disposed between the outlet of the radiator, the pipeline for connecting to the inlet of the heating element and the pipeline for connecting to the liquid storage tank.

[0016] The two bypass three-way valves include a first bypass three-way valve and a second bypass three-way valve, wherein the first bypass three-way valve is disposed between the pipeline for connecting to the inlet of the heating element, the external water source and the replenishment tank, and the second bypass three-way valve is disposed between the pipeline for connecting to the outlet of the heating element, the pipeline for connecting to the storage tank and the inlet of the circulation pump.

[0017] In some embodiments, the first port of the first main three-way valve is connected to the first port of the first bypass three-way valve, the second port of the first main three-way valve is connected to an external water source, and the third port of the first main three-way valve is connected to a radiator.

[0018] The first port of the second main three-way valve is connected to the third port of the second bypass three-way valve, the second port of the second main three-way valve is connected to the liquid storage tank, and the third port of the second main three-way valve is connected to the circulating pump.

[0019] In some embodiments, the second port of the first bypass three-way valve is connected to the replenishment water tank, and the third port is connected to the heating element;

[0020] The first port of the second bypass three-way valve is used to connect to the outlet of the heating element, and the second port is used to connect to the replenishment water tank.

[0021] In some embodiments, a plurality of electric ball valves are also included, wherein the plurality of electric ball valves are provided on the connecting pipeline between the external water source, the storage tank, the replenishment tank and the heating element;

[0022] The air inlet of the radiator is equipped with a filter screen and an electric cam for vibrating the filter screen.

[0023] In some embodiments, the system further includes a temperature sensor and a pressure sensor disposed at the inlet and outlet of the heating element, a flow sensor disposed on the inlet and / or outlet pipeline of the circulating pump, a filter disposed at the inlet of the circulating pump, and a level sensor and an overflow port disposed on the liquid storage tank.

[0024] Secondly, the present invention provides a control method for a heat dissipation system of an underground coal mining and conveying device, applicable to any of the above-mentioned heat dissipation systems, comprising the following steps:

[0025] S1. Control the multiple three-way valves to allow the coolant to circulate between the circulating pump, the radiator, and the heat-generating components, forming a normal cooling mode;

[0026] S2. When the system flow rate is detected to be lower than the first threshold or the coolant temperature is higher than the second threshold, control the multiple three-way valves to switch to the emergency circuit, so that the external water source flows into the liquid storage tank after passing through the heating component, forming an emergency mode.

[0027] S3. Control the multiple three-way valves to allow the replenishment tank to replenish coolant to the heating component, thus forming a replenishment mode;

[0028] S4. When the liquid level in the storage tank reaches the high level, the recovery pump is started to return the water in the storage tank to the external water source, forming a recovery mode.

[0029] In some embodiments, the replenishment mode further includes, during the replenishment mode, discharging air from the heating element through an air respirator on the replenishment tank.

[0030] In some embodiments, the recovery mode is performed simultaneously with the normal cooling mode, emergency mode, or replenishment mode.

[0031] Furthermore, the beneficial effects of the present invention are as follows:

[0032] This invention incorporates a circulating pump, a radiator, an external water source, a liquid storage tank, a liquid replenishment tank, a recovery pump, and multiple three-way valves, forming three distinct circuits: a main circuit, an emergency recovery circuit, and a liquid replenishment circuit. In normal cooling mode, the system circulates coolant between the heat-generating components, the circulating pump, and the radiator, eliminating the need for external water supply and preventing water waste while minimizing environmental damage and pollution to the work surface.

[0033] Meanwhile, when the system detects abnormal conditions such as insufficient flow or excessive temperature, it can switch from the main circuit to the emergency recovery circuit, use an external water source to cool the heating components, and temporarily store the used water in the storage tank to ensure the equipment continues to operate in emergency situations. The system also has an independent liquid replenishment circuit, eliminating the need for additional coolant preparation and manual liquid replenishment operations. It has a high degree of automation, which significantly improves the operational reliability and overall efficiency of the underground coal mining and conveying device. Attached Figure Description

[0034] Figure 1 This is a structural framework diagram of the heat dissipation system of the underground coal mining and conveying device provided by the present invention;

[0035] Figure 2 A structural framework diagram of the main circuit in the heat dissipation system of the underground coal mining and conveying device provided by the present invention;

[0036] Figure 3 A structural framework diagram of the liquid replenishment circuit in the heat dissipation system of the underground coal mining and conveying device provided by the present invention;

[0037] Figure 4 A structural framework diagram of the emergency recovery circuit in the heat dissipation system of the underground coal mining and conveying device provided by the present invention;

[0038] Figure 5 A flowchart illustrating the control method for the heat dissipation system of an underground coal mining and conveying device provided by the present invention.

[0039] In the diagram: 1-Main circuit, 11-Circulation pump, 12-Radiator, 13-Motor fan, 14-Filter screen, 15-Electric cam, 16-Temperature sensor, 17-Pressure sensor, 18-First main circuit three-way valve, 19-First bypass three-way valve, 110-Flow meter, 111-Main filter, 112-Pressure gauge, 113-Second bypass three-way valve, 114-Second main circuit three-way valve, 115-Electric ball valve, 2-Replenishment circuit, 21-Replenishment pump, 22-Dual-point level switch, 23-Replenishment tank, 24-Air respirator, 25-Coolant drain pump, 3-Emergency recovery circuit, 31-Storage tank, 33-Level sensor, 32-Overflow port, 34-Recovery pump, 35-Emergency water drain pump, 36-Emergency filter. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the embodiments of the present invention, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships, for example, A and / or B can mean: A alone, A and B simultaneously, and B alone. In addition, in the description of the embodiments of the present invention, "multiple" means two or more. Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, features defined with "first" and "second" can explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, unless otherwise stated, "multiple" means two or more.

[0041] like Figures 1-4 As shown, in a first aspect, the present invention provides a heat dissipation system for an underground coal mining and conveying device, including a circulating pump 11, a radiator 12, an external water source, a liquid storage tank 31, a replenishment tank 23, a recovery pump 34, and multiple three-way valves.

[0042] The inlet of the circulating pump 11 is connected to the outlet of the heating component of the coal conveying device, and the outlet of the circulating pump 11 is connected to the inlet of the radiator 12.

[0043] The outlet of radiator 12 is used to connect to the inlet of the heating element, and an external water source is used to connect to the inlet of the heating element.

[0044] The liquid storage tank 31 is used to connect to the outlet of the heating element;

[0045] The replenishing water tank 23 is used to connect to the inlet of the heating element;

[0046] The recovery pump 34 is connected between the liquid storage tank 31 and the external water source;

[0047] Multiple three-way valves are installed on the pipelines connected to the inlet and outlet of the heating element to switch the connection between the circulating pump 11, radiator 12, external water source, liquid storage tank 31 and replenishment tank 23 and the heating element.

[0048] One possible implementation also includes a main circuit 1, an emergency recovery circuit 3, and a replenishment circuit 2;

[0049] Multiple three-way valves include two main three-way valves and two bypass three-way valves, used to switch the connection of main circuit 1, emergency recovery circuit 3 and replenishment circuit 2.

[0050] One possible implementation also includes a coolant drain pump 25, which is connected to a replenishment tank 23.

[0051] In one possible implementation, the two main three-way valves include a first main three-way valve 18 and a second main three-way valve 114, wherein the first main three-way valve 18 is disposed between the outlet of the circulating pump 11, the inlet of the radiator 12 and the pipeline for connecting to the outlet of the heating element, and the second main three-way valve 114 is disposed between the outlet of the radiator 12, the pipeline for connecting to the inlet of the heating element and the pipeline for connecting to the liquid storage tank 31;

[0052] The two bypass three-way valves include a first bypass three-way valve 19 and a second bypass three-way valve 113. The first bypass three-way valve 19 is located between the pipeline for connecting to the inlet of the heating element, the external water source, and the replenishment water tank 23. The second bypass three-way valve 113 is located between the pipeline for connecting to the outlet of the heating element, the pipeline for connecting to the storage water tank 31, and the inlet of the circulation pump 11.

[0053] In some embodiments, the first port of the first main three-way valve 18 is connected to the first port of the first bypass three-way valve 19, the second port of the first main three-way valve 18 is connected to an external water source, and the third port of the first main three-way valve 18 is connected to the radiator 12.

[0054] The first port of the second main three-way valve 114 is connected to the third port of the second bypass three-way valve 113, the second port of the second main three-way valve 114 is connected to the liquid storage tank 31, and the third port of the second main three-way valve 114 is connected to the circulating pump 11.

[0055] In one possible implementation, the second port of the first bypass three-way valve 19 is connected to the replenishment water tank 23, and the third port is connected to the heating element.

[0056] The first port of the second bypass three-way valve 113 is used to connect to the outlet of the heating element, and the second port is used to connect to the replenishment water tank 23.

[0057] Among them, the first interface, the second interface, and the third interface of the first main three-way valve 18 and the second main three-way valve 114 respectively correspond to Figure 1 The A, B, and C interfaces in the diagram correspond specifically to the first interfaces of the first main three-way valve 18 and the second main three-way valve 114. Figure 1 Port A in the diagram corresponds to the second interface of the first main three-way valve 18 and the second main three-way valve 114. Figure 1Port B in the diagram corresponds to the third port of the first main three-way valve 18 and the second main three-way valve 114. Figure 1 Port C in the middle.

[0058] The first, second, and third ports of the first bypass three-way valve 19 and the second bypass three-way valve 113 respectively correspond to Figure 1 The a, b, and c interfaces in the diagram correspond specifically to the first interfaces of the first bypass three-way valve 19 and the second bypass three-way valve 113. Figure 1 Port a in the diagram corresponds to the second port of the first bypass three-way valve 19 and the second bypass three-way valve 113. Figure 1 Port b in the diagram corresponds to the third port of the first bypass three-way valve 19 and the second bypass three-way valve 113. Figure 1 Port C in the middle.

[0059] One possible implementation also includes multiple electric ball valves 115, wherein multiple electric ball valves 115 are provided on the connecting pipeline between the external water source, the liquid storage tank 31, the replenishment tank 23 and the heating element;

[0060] Meanwhile, an emergency filter 36 is installed at the inlet of the external water source, and an emergency water drain pump 35 is installed at the inlet of the liquid storage tank 31.

[0061] The air inlet of the radiator 12 is provided with a filter screen 14 and an electric cam 15 for vibrating the filter screen 14.

[0062] The replenishment tank 23 is equipped with a two-point liquid level switch 22 for monitoring high and low liquid levels, so that the liquid level inside can be known at all times.

[0063] One possible implementation includes a temperature sensor 16 and a pressure sensor 17 installed at the inlet and outlet of the heating element, a flow sensor installed on the inlet and / or outlet pipeline of the circulating pump 11, a filter installed at the inlet of the circulating pump 11, and a liquid level sensor 33 and an overflow port 32 installed on the liquid storage tank 31. By integrating various sensors and filters, the automation level of the system is improved, and intelligent operation and status monitoring are realized.

[0064] In one possible implementation, the present invention provides a main filter 111 at the inlet of the circulating pump 11 to protect the pump, and a pressure gauge 112 for displaying the system pressure is installed near the main filter 111 for easy on-site personnel to observe.

[0065] Please refer to Figure 5 Secondly, the present invention provides a control method for a heat dissipation system of an underground coal mining and conveying device, applicable to the heat dissipation system of any of the above claims, comprising the following steps:

[0066] S1. Control multiple three-way valves to make the coolant circulate between the circulating pump 11, radiator 12 and heat-generating components to form a normal cooling mode;

[0067] S2. When the system flow rate is detected to be lower than the first threshold or the coolant temperature is higher than the second threshold, control multiple three-way valves to switch to the emergency circuit, so that the external water source flows into the liquid storage tank 31 after passing through the heating component, forming an emergency mode.

[0068] S3. Control multiple three-way valves to allow the coolant tank 23 to replenish coolant to the heat-generating components, forming a coolant replenishment mode;

[0069] S4. When the liquid level in the storage tank 31 reaches the high level, the recovery pump 34 is started to return the water in the storage tank 31 to the external water source, forming a recovery mode.

[0070] In some embodiments, the replenishment mode further includes, during the replenishment mode process, discharging air from the heating element through the air respirator 24 on the replenishment tank 23.

[0071] In one possible implementation, the recovery mode is performed simultaneously with the normal cooling mode, emergency mode, or liquid replenishment mode.

[0072] The specific embodiments of the present invention will be described in detail below with reference to specific implementation methods:

[0073] After the system is powered on, a system and component status check is performed: temperature sensor 16 readings are normal and do not exceed the limit value, which is 50℃; pressure sensor 17 readings are normal and basically consistent, specifically, the difference between the readings of each pressure sensor 17 does not exceed 0.5 bar; the AC port of the first main three-way valve 18 and the second main three-way valve 114 is open and the B port is closed; the ac port of the first bypass three-way valve 19 and the second bypass three-way valve 113 is open and the b port is closed; at the same time, the readings of each flow meter 110 are normal and basically consistent, specifically, the difference between the readings of each flow meter 110 does not exceed 0.5 L / min; all electric ball valves 115 are in the closed state. After all components are in good condition, proceed to the next step.

[0074] The system operates in four modes during normal operation:

[0075] Normal cooling mode:

[0076] The conventional circulating pump 11 starts, pumping liquid to the radiator 12. The motor fan 13 of the radiator 12 starts and stops according to the liquid temperature: when the liquid temperature reaches the set value T1, the motor fan 13 starts. When the liquid temperature is lower than the set value T2, the motor fan 13 stops running. T2 is 3°C lower than T1. Preferably, T1 is 25°C and T2 is 22°C.

[0077] Simultaneously, when the motor fan 13 is running, the electric cam 15 starts at the same time, intermittently vibrating the radiator 12 and filter screen 14 to reduce coal dust adhering to the filter screen. The system monitors the liquid flow rate in real time through the flow meter 110. When the system flow rate is more than 20% lower than the theoretical flow rate, an alarm message is sent to the main controller, but the system continues to operate normally.

[0078] When the system flow rate is more than 50% lower than the theoretical flow rate, or when the temperature sensor 16 detects that the liquid temperature exceeds the set value T3, an alarm message is sent to the main controller, requesting entry into emergency mode. In this invention, T3 is preferably 50°C.

[0079] Emergency Mode:

[0080] When the command to enter emergency mode is received, port C of the first main three-way valve 18 and the second main three-way valve 114 is closed, port AB is open, and the electric ball valve 115 connected to them is opened. At this time, the liquid no longer flows into the radiator 12 (i.e., the heat-generating component), but returns to the normal circulation pump 11 via the electric ball valve 115. At the same time, the first bypass three-way valve 19 remains in its original state, port C of the second bypass three-way valve 113 is closed, port AB is open, and the coolant drain pump 25 is started to transfer the liquid in the radiator 12 to the replenishment tank 23. When the reading of the flow meter 110 connected to it is 0, it means that the liquid in the radiator 12 has been drained. At this time, the second bypass three-way valve 113 enters the switching action again: port B is closed and port AC is open.

[0081] After completing the above steps, the electric ball valve 115 connected to the external water source is opened, and the water flows through the ball valve and the emergency filter 36, and flows into the radiator 12 through the BA passage of the first main three-way valve 18 and the ca passage of the first bypass three-way valve 19. The flow meter 110 connected to it will display the corresponding flow rate, and then flow through the ac passage of the second bypass three-way valve 113 and the AB passage of the second main three-way valve 114 to the emergency water drain pump 35, and finally flow into the liquid storage tank 31.

[0082] In emergency mode, the motor fan 13 of the conventional circulation pump 11 and radiator 12 continue to run, continuing to discharge the heat of the main liquid into the air until the liquid temperature drops to a level that is basically equal to the readings of the two temperature sensors 16 connected to it, or the difference is ≤0.5℃. At this time, if there is no other fault information in the system, it will send a "liquid replenishment can be resumed" signal to the main controller.

[0083] Unless the main controller receives the aforementioned "recoverable fluid replenishment" signal, the emergency mode will continue until the end of this operation. If the emergency mode continues until the end, it needs to be checked and reset to be deactivated.

[0084] Fluid replacement mode:

[0085] Regardless of whether the emergency mode ends automatically or manually, you must enter the fluid resuscitation mode before returning to normal mode.

[0086] After the system enters the replenishment mode, the electric ball valve 115 connected to the external water source closes, and the external water source no longer supplies emergency water to the flow path. Port C of the first bypass three-way valve 19 closes, while ports A and B are open. The electric ball valve 115 connected to it opens, and the replenished liquid will push the air in the radiator 12 into the replenishment tank 23, and then be discharged to the outside via the air respirator 24. When the reading of the flow meter 110 connected to it is basically consistent with the air in the radiator 12, it indicates that the air in the radiator 12 has been basically purged. At this time, the replenishment pump 21 stops running, the electric ball valve 115 connected to it closes, and the first bypass three-way valve 19 enters an action switch: port B closes, port A and B are open, and the replenishment ends. At this time, if there are no other fault information in the system, a "normal mode can be restored" signal is sent to the main controller.

[0087] Recycling mode:

[0088] Due to the limited capacity of the storage tank 31, a recovery mode is implemented to avoid water waste and environmental impact. When the level sensor 33 reaches a high level, indicating that the tank is largely empty, the recovery pump 34 starts, and the connected electric ball valve 115 opens, allowing water in the storage tank 31 to return to the external water source. When the level sensor 33 reaches a low level, indicating that the tank is largely empty, the recovery pump 34 shuts off, and the connected electric ball valve 115 closes to prevent external water from flowing into the storage tank 31.

[0089] The recycling mode does not conflict with any of the other modes and can be activated at any time.

[0090] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A heat dissipation system for an underground coal mining and conveying device, characterized in that, include: The system includes a circulating pump, radiator, external water source, liquid storage tank, replenishment tank, recovery pump, and multiple three-way valves. The inlet of the circulating pump is connected to the outlet of the heating component of the coal conveying device, and the outlet of the circulating pump is connected to the inlet of the radiator. The outlet of the radiator is used to connect to the inlet of the heating element, and the external water source is used to connect to the inlet of the heating element. The liquid storage tank is used to connect to the outlet of the heating element; The replenishment water tank is used to connect to the inlet of the heating element; The recovery pump is connected between the liquid storage tank and the external water source; Multiple three-way valves are installed on the pipelines connected to the inlet and outlet of the heating element, and are used to switch the connection relationship between the circulating pump, radiator, external water source, liquid storage tank and replenishment tank and the heating element; It also includes the main circuit, emergency recovery circuit, and liquid replenishment circuit; The plurality of three-way valves include two main three-way valves and two bypass three-way valves, used to switch the connection of the main circuit, the emergency recovery circuit and the replenishment circuit; The two main three-way valves include a first main three-way valve and a second main three-way valve, wherein the first main three-way valve is disposed between the outlet of the circulating pump, the inlet of the radiator and the pipeline for connecting to the outlet of the heating element, and the second main three-way valve is disposed between the outlet of the radiator, the pipeline for connecting to the inlet of the heating element and the pipeline for connecting to the liquid storage tank. The two bypass three-way valves include a first bypass three-way valve and a second bypass three-way valve, wherein the first bypass three-way valve is disposed between the pipeline for connecting to the inlet of the heating element, the external water source and the replenishment tank, and the second bypass three-way valve is disposed between the pipeline for connecting to the outlet of the heating element, the pipeline for connecting to the storage tank and the inlet of the circulation pump; The first port of the first main three-way valve is connected to the first port of the first bypass three-way valve, the second port of the first main three-way valve is connected to an external water source, and the third port of the first main three-way valve is connected to a radiator. The first port of the second main three-way valve is connected to the third port of the second bypass three-way valve, the second port of the second main three-way valve is connected to the liquid storage tank, and the third port of the second main three-way valve is connected to the circulating pump. The second port of the first bypass three-way valve is connected to the replenishment water tank, and the third port is connected to the heating element; The first port of the second bypass three-way valve is used to connect to the outlet of the heating element, and the second port is used to connect to the replenishment water tank.

2. The heat dissipation system of the underground coal mining and conveying device as described in claim 1, characterized in that, It also includes multiple electric ball valves, wherein multiple electric ball valves are installed on the connecting pipeline between the external water source, the liquid storage tank, the liquid replenishment tank and the heating element; The air inlet of the radiator is equipped with a filter screen and an electric cam for vibrating the filter screen.

3. The heat dissipation system for the underground coal mining and conveying device as described in claim 1, characterized in that, It also includes a temperature sensor and a pressure sensor installed at the inlet and outlet of the heating element, a flow sensor installed on the inlet and / or outlet pipeline of the circulating pump, a filter installed at the inlet of the circulating pump, and a liquid level sensor and an overflow port installed on the liquid storage tank.

4. A control method for the heat dissipation system of an underground coal mining conveying device, characterized in that, The heat dissipation system applied to any one of claims 1-3 includes the following steps: S1. Control the multiple three-way valves to allow the coolant to circulate between the circulating pump, the radiator, and the heat-generating components, forming a normal cooling mode; S2. When the system flow rate is detected to be lower than the first threshold or the coolant temperature is higher than the second threshold, control the multiple three-way valves to switch to the emergency circuit, so that the external water source flows into the liquid storage tank after passing through the heating component, forming an emergency mode. S3. Control the multiple three-way valves to allow the replenishment tank to replenish coolant to the heating component, thus forming a replenishment mode; S4. When the liquid level in the storage tank reaches the high level, the recovery pump is started to return the water in the storage tank to the external water source, forming a recovery mode.

5. The control method for the heat dissipation system of the underground coal mining and conveying device as described in claim 4, characterized in that, The replenishment mode also includes, during the replenishment process, discharging air from the heating element through an air respirator on the replenishment tank.

6. The control method for the heat dissipation system of the underground coal mining and conveying device as described in claim 4, characterized in that, The recovery mode is performed simultaneously with the normal cooling mode, emergency mode, or liquid replenishment mode.

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