A suspended positioning double-hole multi-row step cooling device and method for coal mine tunnels

Abstract

The present invention discloses a coal mine tunnel suspended positioning type double-hole multi-row cascade cooling device and method, the device includes a multi-stage double-hole cooling pipe module, a cooling circulation module, a temperature monitoring and control module and a suspended push-pull positioning module, the multi-stage double-hole cooling pipe module is installed on the suspended push-pull positioning module and is connected to the cooling circulation module, the temperature detection and control module is arranged on the multi-stage double-hole cooling pipe module, the multi-stage double-hole cooling pipe module includes a plurality of cooling units arranged axially along the coal mine tunnel, the cooling unit includes a double-hole semicircular tube and a plurality of double-hole horizontal tubes, the two ends of the plurality of double-hole horizontal tubes are connected to the double-hole semicircular tube, and the spacing between adjacent double-hole horizontal tubes is less than the tube diameter. The present application solves the problems of low heat exchange efficiency and poor spatial adaptability of traditional cooling technology through the control mechanism of multi-stage gradient heat exchange, the heat exchange efficiency is greatly improved compared with the traditional cooling method, the cooling effect is significant, and the safety is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mine cooling, and in particular to a suspended positioning double-hole multi-row step cooling device and method for a coal mine tunnel. Background Art

[0002] With increasing depth and mechanization in coal mining, high temperatures underground are becoming an increasingly prominent issue. High temperatures not only severely impact the health and safety of workers, but also accelerate equipment aging, increase energy consumption, and even create safety hazards such as gas accumulation.

[0003] Currently, the cooling technologies commonly used in coal mines mainly include mechanical ventilation, refrigeration unit cooling, spray cooling, and local ice packs, but all of them have significant limitations:

[0004] 1. Traditional ventilation cooling: relies on airflow to remove heat, but the ventilation resistance in deep tunnels is large and the air circulation efficiency is low, making it difficult to effectively reduce the temperature in high-temperature areas and resulting in high energy consumption.

[0005] 2. Refrigeration unit application: Large-scale refrigeration equipment and complex piping systems are required, which have problems such as large initial investment, high operation and maintenance costs, and occupied tunnel space. In addition, there is serious cooling loss when transporting cold air over long distances.

[0006] 3. Spray cooling technology: It absorbs heat and cools down through the evaporation of water mist, but it will increase the humidity in the tunnel, causing equipment corrosion, muddy bottom plate, and worsening the working environment. Long-term use may also cause roof stability problems.

[0007] 4. Phase change material (PCM) application: Existing technologies already have cooling solutions that utilize phase change materials to store / release heat, but most of them use single-stage phase change modules, which have a narrow temperature adjustment range, insufficient cooling rate, and lack effective heat recovery and circulation control mechanisms, resulting in low phase change material utilization and unstable cooling effects.

[0008] In addition, the existing cooling devices are mostly installed in a fixed manner, which is difficult to adapt to the complex and changeable tunnel structure. They also lack intelligent monitoring and control means and cannot respond to underground temperature fluctuations in real time, making it difficult to balance cooling efficiency and safety. Summary of the Invention

[0009] The main purpose of the present invention is to provide a coal mine tunnel suspended positioning double-hole multi-row step cooling device, aiming to solve the above technical problems.

[0010] To achieve the above-mentioned purpose, the present invention proposes a coal mine tunnel suspended positioning type double-hole multi-row cascade cooling device, which includes a multi-stage double-hole cooling pipe module, a cooling circulation module, a temperature monitoring and control module and a suspended push-pull positioning module. The multi-stage double-hole cooling pipe module is installed on the suspended push-pull positioning module and is connected to the cooling circulation module. The temperature monitoring and control module is arranged on the multi-stage double-hole cooling pipe module. The multi-stage double-hole cooling pipe module includes a plurality of cooling units arranged axially along the coal mine tunnel. The cooling unit includes a double-hole semicircular pipe and a plurality of double-hole horizontal pipes. The two ends of the double-hole horizontal pipe are connected to the double-hole semicircular pipe, and the spacing between adjacent double-hole horizontal pipes is less than the pipe diameter.

[0011] In one embodiment, the double-hole semicircular tube and the double-hole horizontal tube both include a cooling outer tube and a cooling inner tube, the cooling outer tube is provided with a phase change material, and the cooling inner tube is provided with a cooling medium.

[0012] In one embodiment, the cooling circulation module includes a cooling device and a circulation pump, and the circulation pump is connected to the cooling inner pipe.

[0013] In one embodiment, the temperature monitoring and control module includes a thermocouple, a solid-liquid interface scale window, and water inlet and outlet valves. The thermocouple is arranged on the inner wall of the cooling outer tube, the inner wall of the cooling inner tube, the surrounding rock and the tunnel, and the solid-liquid interface scale window is installed on the cooling unit.

[0014] In one embodiment, the solid-liquid interface scale window is made of a heat-insulating transparent material, and scale lines are engraved on the surface of the solid-liquid interface scale window.

[0015] In one embodiment, the suspended push-pull positioning module includes a top plate anchor hook, a steel wire rope, a base hook, a hanging base, a slide rail and a double-hole cooling pipe hook. The hanging base is connected to the top plate anchor hook through the steel wire rope, and the cooling unit is connected through the double-hole cooling pipe hook.

[0016] In addition, the present invention also provides a coal mine roadway suspended positioning double-hole multi-row step cooling method, the coal mine roadway suspended positioning double-hole multi-row step cooling method is applied to the coal mine roadway suspended positioning double-hole multi-row step cooling device as described above, the coal mine roadway suspended positioning double-hole multi-row step cooling method includes:

[0017] S100, thermodynamic adaptation design of key parameters of cooling device, importing the geothermal geological condition parameters of the site into the numerical model, and calculating the surrounding rock temperature T under the scheme without using key cooling parameters. R The cooling rate ΔT of the tunnel ambient temperature and the total cooling heat Q within the tunnel service life n years all, average value of range of solid phase ratio The average temperature drop of the cross section parallel to the last stage double-hole cooling pipe ΔT EP , determine the phase transition temperature T according to the following formula PCM , step phase change temperature difference ΔT PCM , the distance L1 between the double-hole cooling pipes at each level and the cooling time t cool :

[0018]

[0019] S200, underground installation of cooling device and its solid phase initialization, and adjustment of phase change temperature to T PCM The temperature difference between the step phase transition and the PCM Phase change material, and load the phase change material into the cooling outer tube through the filler inlet, and lower all modules through the auxiliary shaft to the tunnel position that needs to be cooled in the mine, install the multi-stage double-hole cooling pipe module, cooling circulation module, temperature monitoring and control module and suspended push-pull positioning module in sequence, after installation, start the suspended push-pull positioning module, push each stage of double-hole cooling pipe to the corresponding position according to the spacing L1 through the slide rail and fix it, arrange the thermocouple and solid-liquid interface scale window to the specified position, and then connect each pipeline and equipment. After the installation is completed, observe the scale of the solid-liquid interface scale window, start the cooling circulation module to perform solid-phase initialization setting on the phase change material, and stop the initialization operation when the scale of the solid-liquid interface scale window is 1.0;

[0020] S300, the circulating refrigeration mode of the cooling device is started and the temperature monitoring and control module is started to monitor the data in real time and control the device. When the ambient temperature of the underground tunnel is higher than the phase change temperature of the phase change material, the multi-stage double-hole cooling pipe module is automatically started, and the phase change material begins to absorb ambient heat and undergoes phase change. When the temperature monitoring and control module reads that the solid-liquid interface scale window points to 0.0, the cooling equipment, circulation pump and water inlet and outlet valves in the cooling circulation module are started, and the cooling medium begins to flow in the cooling inner tube, absorbing the phase change heat of the phase change material and introducing the phase change heat into the cooling equipment. When the temperature monitoring and control module reads that the solid-liquid interface scale window points to 0.7, the cooling equipment, circulation pump and water inlet and outlet valves in the cooling circulation module are closed, completing the refrigeration cycle within one operating cycle, and cooling is carried out in this cycle.

[0021] In the technical solution of the present invention, the problems of low heat exchange efficiency and poor spatial adaptability of traditional cooling technology are solved through the control mechanism of multi-stage gradient heat exchange. The heat exchange efficiency is greatly improved compared with traditional cooling methods, the cooling effect is significant, and safety is further improved.

[0022] The use of a modular suspension structure can break through the limitations of tunnel space. At the same time, through the circulating water system and waste heat recovery technology, it can greatly save operating costs, extend the life of equipment, significantly improve work efficiency, and protect the physical and mental health of underground workers. It provides a scientific basis and process optimization solutions for the prevention and control of heat hazards in deep coal mining, and promotes the industry's transformation towards a green, low-carbon, efficient and safe direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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 the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a structural schematic diagram of a suspended positioning double-hole multi-row step cooling device for a coal mine tunnel according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the staggered ventilation and heat exchange principle of an embodiment of the present invention;

[0026] Figure 3 This is a diagram showing the arrangement of the solid-liquid interface scale window according to an embodiment of the present invention;

[0027] Figure 4 This is a phase change temperature cloud diagram of the embodiment of the present invention after running for 120 hours;

[0028] Figure 5 This is a solid phase ratio diagram after running for 120 hours in an embodiment of the present invention;

[0029] Figure 6 This is a solid phase ratio curve diagram of the embodiment of the present invention after running for 120 hours;

[0030] Figure 7 This is the cooling curve of the embodiment of the present invention after running for 120 hours.

[0031] Explanation of the accompanying numbers: 1. Multi-stage double-hole cooling pipe module; 2. Cooling circulation module; 3. Temperature monitoring and control module; 4. Suspended push-pull positioning module; 5. Cooling outer pipe; 6. Phase change material; 7. Filling inlet; 8. Cooling inner pipe; 9. Double-hole horizontal pipe; 10. Double-hole semicircular pipe; 11. Cooling medium; 12. Cooling equipment; 13. Circulating pump; 14. Thermocouple; 15. Solid-liquid interface scale window; 16. Water inlet and outlet valve; 17. Top plate anchor hook; 18. Wire rope; 19. Base hook; 20. Hanging base; 21. Slide rail; 22. Double-hole cooling pipe hook.

[0032] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0033] 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0036] Moreover, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The invention provides a coal mine tunnel suspended positioning double-hole multi-row step cooling device.

[0038] like Figure 1-Figure 7 As shown, the coal mine tunnel suspended positioning type double-hole multi-row cascade cooling device provided by the embodiment of the present invention includes a multi-stage double-hole cooling pipe module 1, a cooling circulation module 2, a temperature monitoring and control module 3 and a suspended push-pull positioning module 4, the multi-stage double-hole cooling pipe module 1 is installed on the suspended push-pull positioning module 4 and is connected to the cooling circulation module 2, the temperature monitoring and control module is arranged on the multi-stage double-hole cooling pipe module 1, the multi-stage double-hole cooling pipe module 1 includes a plurality of cooling units arranged axially along the coal mine tunnel, the cooling unit includes a double-hole semicircular pipe 10 and a plurality of double-hole horizontal pipes 9, the two ends of the plurality of double-hole horizontal pipes 9 are connected to the double-hole semicircular pipe 10, and the distance between adjacent double-hole horizontal pipes 9 is less than the pipe diameter.

[0039] The double-hole semicircular tube 10 and the double-hole horizontal tube 9 both include a cooling outer tube 5 and a cooling inner tube 8 . The cooling outer tube 5 is provided with a phase change material 6 , and the cooling inner tube 8 is provided with a cooling medium 11 .

[0040] In this embodiment, the cooling circulation module 2 includes a cooling device 12 and a circulation pump 13 , and the circulation pump 13 is connected to the cooling inner pipe 8 .

[0041] The temperature monitoring and control module includes a thermocouple 14, a solid-liquid interface scale window 15, and a water inlet and outlet valve 16. The thermocouple 14 is arranged on the inner wall of the cooling outer tube 5, the inner wall of the cooling inner tube 8, the surrounding rock and the tunnel. The solid-liquid interface scale window 15 is installed on the cooling unit. The solid-liquid interface scale window 15 is made of a heat-insulating transparent material, and the surface of the solid-liquid interface scale window 15 is engraved with scale lines.

[0042] The suspended push-pull positioning module 4 includes a top plate anchor hook 17, a steel wire rope 18, a base hook 19, a hanging base 20, a slide rail 21 and a double-hole cooling pipe hook 22. The hanging base 20 is connected to the top plate anchor hook 17 through the steel wire rope 18, and the cooling unit is connected through the double-hole cooling pipe hook 22.

[0043] The present invention provides a coal mine tunnel suspended positioning double-hole multi-row step cooling method, comprising the following steps:

[0044] 1) Numerical model construction: A matching cooling device size framework was built based on the geothermal geological conditions of the mining area and the underground environmental parameters. A numerical model of the underground cooling device model was established using COMSOL software. Multi-physics field coupling analysis was performed using laminar flow, Darcy's law, and porous media heat transfer modules. The natural convection effect caused by the phase change of phase change material 6 was ignored, as was the deformation caused by temperature changes and the contact thermal resistance between different materials. The surrounding rock and the multi-stage double-hole cooling pipe module 1 were assumed to be isotropic, and mass transfer was ignored.

[0045] 2) Thermodynamic adaptation design of key parameters of cooling device: import the geothermal geological condition parameters of the site into the numerical model, and calculate the cooling rate ΔT and total cooling heat Q of the tunnel ambient temperature within the tunnel service life n years under different cooling key parameter schemes. all , average value of range of solid phase ratio The average temperature drop of the cross section parallel to the last stage double-hole cooling pipe ΔT EP , determine the phase transition temperature T according to the following formula (1): PCM , step phase change temperature difference ΔT PCM , the distance L1 between the double-hole cooling pipes at each level and the cooling time t cool Other key parameters:

[0046]

[0047] The simulation time step and total time of the numerical model are set to 1 minute and 120 hours respectively. Taking into account the geothermal geological conditions of the coal mine and the influence of the underground environment, the key parameters T of the cooling device are obtained through calculation and simulation verification. PCM , ΔT PCM , L1 and t cool The best temperature reduction conditions are 29℃, 5℃, 0.5m and 6h respectively. Figure 2-Figure 7 shown.

[0048] 2) The cooling device is installed underground. The cooling device is lowered to the position underground where cooling is required through the lifting equipment, and the suspended push-pull positioning module 4 is started for construction. According to the structural characteristics of the tunnel roof, a customized hanging base 20 is designed in advance, equipped with a wire rope 18, a base hook 19, and a slide rail 21. The thermocouple 14 and the solid-liquid interface scale window 15 are arranged in advance to the specified position, and then the various pipelines and equipment are connected. The phase change material 6 is loaded into the cooling outer tube 5 through the filler inlet 7, and the size of the distance L1 between each level of double-hole cooling pipes is adjusted by the slide rail 21. After assembly, the device is pulled to the specified position by the hanging pulley and hung on the roof anchor hook 17.

[0049] 3) Solid phase initialization of the cooling device. After the device is built, observe the scale of the solid-liquid interface scale window 15, start the cooling cycle module 2 to perform solid phase initialization setting on the phase change material 6, and stop the initialization operation when the scale of the solid-liquid interface scale window 15 is 1.0.

[0050] 4) The circulating refrigeration mode of the cooling device is started and operated. After completing step 3), the temperature monitoring and control module 3 is started to monitor the data in real time and control the device. When the ambient temperature of the underground tunnel is higher than the phase change temperature of the phase change material 6, the multi-stage double-hole cooling pipe module 1 is automatically started, and the phase change material 6 begins to absorb ambient heat and undergoes phase change. When the temperature monitoring and control module 3 reads that the solid-liquid interface scale window 15 points to 0.0, the cooling device 12, the circulating pump 13 and the water inlet and outlet valves 16 in the cooling circulation module 2 are started, and the cooling medium 11 begins to flow in the cooling inner tube 8, absorbing the phase change heat of the phase change material 6 and introducing the phase change heat into the cooling device 12. When the temperature monitoring and control module 3 reads that the solid-liquid interface scale window 15 points to 0.7, the cooling device 12, the circulating pump 13 and the water inlet and outlet valves 16 in the cooling circulation module 2 are closed, and the refrigeration cycle within one operating cycle is completed, and the cycle continues;

[0051] 5) A control method for the cooling circulation system. Accordingly, based on step 4), the temperature changes of the surrounding rock, the phase change material 6, and the cooling medium 11 monitored by the thermocouple 14 are ultimately reflected as specific readings at the solid-liquid interface scale window 15, and the operating efficiency of the cooling circulation module 2 is controlled based on the specific readings at the solid-liquid interface scale window 15.

[0052] ① Installation parameters: The solid-liquid interface scale window 15 is arranged at a height h (h>R, R is the radius of the cooling outer tube) m higher than the junction of the inner and outer tubes and the first row of left columns, that is, the place where phase change fully occurs. It is made of thermal insulation transparent material and wraps the cooling inner tube 8 and the cooling outer tube 5. A thin layer phase change module is added to a section at the center of the cooling outer tube 5, and scale lines are set on the surface.

[0053] ② Working principle: when no phase change occurs, that is, in the initial state, the phase change material 6 is located at the scale line 1.0. After the phase change occurs, the solid-liquid interface begins to appear and its position continues to decrease. For example, when the solid-liquid interface boundary reaches the scale line 0.8, the solid phase proportion of the phase change material 6 reaches 80%. When it reaches the scale line 0.0, the solid phase proportion of the phase change material 6 reaches 0%, indicating that the phase change material 6 has completely absorbed heat and melted.

[0054] ③ Control method: When the phase change material 6 in the solid-liquid interface window 15 undergoes a phase change and the solid-liquid interface position drops to 0.0, the inlet and outlet valves automatically open, and the circulation pump 13 and cooling device 12 are activated. The speed of the circulation pump 13 or the circulation flow rate of the cooling medium 11 can be increased as needed to enhance heat dissipation. When the solid-liquid interface line reaches 0.7, the valve is closed, and the circulation pump 13 is turned off. The cooling device 12 continues to operate until the medium cools down and stops operating, repeating the cycle.

[0055] 6) Healthy operation and maintenance of the cooling device throughout its life cycle underground. The temperature monitoring and control module 3 adjusts the device parameters in a timely manner according to the on-site monitoring data. Due to the long-term use of the multi-stage double-hole cooling pipe module 1, wear and tear may occur, resulting in leakage of the phase change material 6. The integrity of the device needs to be checked regularly. Once leakage occurs, it needs to be repaired in time and the phase change material 6 needs to be replenished. Similarly, the cooling circulation module 2, temperature monitoring and control module 3 and suspended push-pull positioning module 4 need to be regularly maintained and serviced to ensure the normal operation of the cooling device throughout its life cycle.

[0056] This application solves the problems of low heat exchange efficiency and poor spatial adaptability of traditional cooling technology through a multi-stage gradient heat exchange control mechanism. The heat exchange efficiency is greatly improved compared with traditional cooling methods, the cooling effect is significant, and safety is further improved.

[0057] The use of a modular suspension structure can break through the limitations of tunnel space. At the same time, through the circulating water system and waste heat recovery technology, it can greatly save operating costs, extend the life of equipment, significantly improve work efficiency, and protect the physical and mental health of underground workers. It provides a scientific basis and process optimization solutions for the prevention and control of heat hazards in deep coal mining, and promotes the industry's transformation towards a green, low-carbon, efficient and safe direction.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A coal mine tunnel suspended positioning double-hole multi-row cascade cooling device, characterized in that: The coal mine tunnel suspended positioning double-hole multi-row cascade cooling device includes a multi-stage double-hole cooling pipe module, a cooling circulation module, a temperature monitoring and control module and a suspended push-pull positioning module. The multi-stage double-hole cooling pipe module is installed on the suspended push-pull positioning module and is connected to the cooling circulation module. The temperature monitoring and control module is arranged on the multi-stage double-hole cooling pipe module. The multi-stage double-hole cooling pipe module includes a plurality of cooling units arranged axially along the coal mine tunnel. The cooling unit includes a double-hole semicircular tube and a plurality of double-hole horizontal tubes. Both ends of the double-hole horizontal tube are connected to the double-hole semicircular tube, and the spacing between adjacent double-hole horizontal tubes is smaller than the diameter of the double-hole horizontal tube. The coal mine tunnel suspended positioning double-hole multi-row cascade cooling method includes: S100, thermodynamic adaptation design of key parameters of cooling device, importing the geothermal geological condition parameters of the site into the numerical model, and calculating the surrounding rock temperature T under the scheme without using key cooling parameters. R The cooling rate ΔT of the tunnel ambient temperature and the total cooling heat Q within the tunnel service life n years all , average value of range of solid phase ratio The average temperature drop of the cross section parallel to the last stage double-hole cooling pipe ΔT EP , determine the phase transition temperature T according to the following formula PCM , step phase change temperature difference ΔT PCM , the distance L1 between the double-hole cooling pipes at each level and the cooling time t cool : S200, underground installation of cooling device and its solid phase initialization, and adjustment of phase change temperature to T PCM The temperature difference between the step phase transition and the PCM Phase change material, and load the phase change material into the cooling outer tube through the filler inlet, and lower all modules through the auxiliary shaft to the tunnel position that needs to be cooled in the mine, install the multi-stage double-hole cooling pipe module, cooling circulation module, temperature monitoring and control module and suspended push-pull positioning module in sequence, after installation, start the suspended push-pull positioning module, push each stage of double-hole cooling pipe to the corresponding position according to the spacing L1 through the slide rail and fix it, arrange the thermocouple and solid-liquid interface scale window to the specified position, and then connect each pipeline and equipment. After the installation is completed, observe the scale of the solid-liquid interface scale window, start the cooling circulation module to perform solid-phase initialization setting on the phase change material, and stop the initialization operation when the scale of the solid-liquid interface scale window is 1.0; S300, the circulating refrigeration mode of the cooling device is started and the temperature monitoring and control module is started to monitor the data in real time and control the device. When the ambient temperature of the underground tunnel is higher than the phase change temperature of the phase change material, the multi-stage double-hole cooling pipe module is automatically started, and the phase change material begins to absorb ambient heat and undergoes phase change. When the temperature monitoring and control module reads that the solid-liquid interface scale window points to 0.0, the cooling equipment, circulation pump and water inlet and outlet valves in the cooling circulation module are started, and the cooling medium begins to flow in the cooling inner tube, absorbing the phase change heat of the phase change material and introducing the phase change heat into the cooling equipment. When the temperature monitoring and control module reads that the solid-liquid interface scale window points to 0.7, the cooling equipment, circulation pump and water inlet and outlet valves in the cooling circulation module are closed, completing the refrigeration cycle within one operating cycle, and cooling is carried out in this cycle.

2. The coal mine tunnel suspended positioning double-hole multi-row step cooling device according to claim 1 is characterized in that: The double-hole semicircular tube and the double-hole horizontal tube both include a cooling outer tube and a cooling inner tube. The cooling outer tube is provided with a phase change material, and the cooling inner tube is provided with a cooling medium.

3. The coal mine tunnel suspended positioning double-hole multi-row step cooling device according to claim 2, characterized in that: The cooling circulation module includes a cooling device and a circulation pump, and the circulation pump is connected to the cooling inner pipe.

4. The coal mine tunnel suspended positioning double-hole multi-row step cooling device according to claim 2, characterized in that: The temperature monitoring and control module includes a thermocouple, a solid-liquid interface scale window, and water inlet and outlet valves. The thermocouple is arranged on the inner wall of the cooling outer tube, the inner wall of the cooling inner tube, the surrounding rock and the tunnel. The solid-liquid interface scale window is installed on the cooling unit.

5. The coal mine tunnel suspended positioning double-hole multi-row step cooling device according to claim 4 is characterized in that: The solid-liquid interface scale window is made of a heat-insulating transparent material, and scale lines are engraved on the surface of the solid-liquid interface scale window.

6. The coal mine tunnel suspended positioning double-hole multi-row step cooling device according to claim 1, characterized in that: The suspended push-pull positioning module includes a top plate anchor hook, a steel wire rope, a base hook, a hanging base, a slide rail and a double-hole cooling pipe hook. The hanging base is connected to the top plate anchor hook through the steel wire rope, and the cooling unit is connected through the double-hole cooling pipe hook.

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