A welding device for the maintenance of underground coal mining machines

Abstract

This invention belongs to the technical field of repair and welding equipment, and particularly relates to a welding device for the repair of underground coal mining machines. It includes a protective dome and a controller installed on the side wall of the protective dome. It also includes two symmetrical semi-circular steel clamps, each disposed on one side of the protective dome for clamping onto the outside of the drum mounting base. The protective dome is fitted over the outside of the cutting drum. The protective dome is equipped with a connecting mechanism, and the dome is connected to the two semi-circular steel clamps via the connecting mechanism. A gas circulation unit is installed on the outside of the protective dome for circulating and purifying the air inside the dome. This invention not only reduces the frequency of repairs to the cutting drum of a coal mining machine, but also enables on-site welding repairs of the cutting drum underground, eliminating the need for disassembly and transportation, thus reducing the impact on coal mining efficiency. Furthermore, it offers excellent repair safety.

Description

Technical Field

[0001] This invention belongs to the field of maintenance welding equipment technology, and in particular relates to a welding device for the maintenance of underground coal mining machines. Background Technology

[0002] Coal mining machines are crucial in coal mining, but they operate under harsh underground conditions for extended periods, such as high loads, coal dust erosion, and humid environments. These conditions can easily lead to wear and cracking of components, affecting the normal operation of the coal mining machine and reducing mining efficiency. Welding repair is a key means to ensure the continued stable operation of the coal mining machine. It can repair damaged cutting parts, traction parts, and other critical structures, restoring their performance, which is of great significance to the continuous production of coal mines.

[0003] Currently, the cutting part of the coal mining machine needs to act directly on the working face to cut off the coal blocks. Therefore, the cutting part of the coal mining machine wears out quickly and requires frequent maintenance. When maintaining the cutting part, welding equipment is required, such as the welding processing equipment for coal mining machinery maintenance disclosed in patent publication number CN114559201B.

[0004] Because coal mining machines are located underground in coal mines, where there are flammable and explosive substances such as gas and coal dust, maintenance of the coal mining machine requires disassembling the cutting drum and transporting it to a safe area on the surface or underground for welding repairs. First, for easily worn components such as the cutting teeth on the cutting drum, frequent welding repairs require high-frequency disassembly, assembly, and transportation of the cutting drum, which affects coal mining efficiency to some extent. Second, if the maintenance frequency is reduced, the cutting efficiency of the damaged cutting teeth on coal blocks will decrease, which will also affect coal mining efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a welding device for the maintenance of underground coal mining machines.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a welding device for the maintenance of an underground coal mining machine, comprising a protective cover and a controller installed on the side wall of the protective cover, and further comprising:

[0007] Two symmetrical semi-circular steel ferrules are set on one side of the protective cover and are used to clamp the outer side of the roller mounting seat. The protective cover is fitted on the outer side of the cutting roller. The protective cover is equipped with a connecting mechanism and is connected to the two semi-circular steel ferrules through the connecting mechanism.

[0008] A gas circulation unit is installed on the outside of the protective dome to circulate and purify the air inside the protective dome.

[0009] The welding unit, located on the side wall of the protective cover, is used for welding and repairing the cutting drum.

[0010] The thermal conductivity testing unit is located inside the protective circular shield;

[0011] The ventilation assembly is located inside the gas circulation unit, and the controller controls the operation of the ventilation assembly based on the electrical signal output by the thermal conductivity test unit.

[0012] Preferably, the connecting mechanism includes a mounting ring rotatably sleeved on the outside of the protective cover, and the mounting ring is detachably connected to two semi-circular steel sleeves. The inner side of the protective cover is provided with a magnetic fixing component, and the magnetic fixing component is magnetically fixed to the two semi-circular steel sleeves.

[0013] Preferably, the gas circulation unit includes a square sleeve fixedly installed on the outer wall of the protective dome, and an air pump is installed inside the square sleeve. The air pump's suction end is fixedly connected to a suction pipe, which is connected to the interior of the protective dome. A baffle is installed inside the square sleeve on one side of the air pump's outlet end, and the side of the square sleeve away from the baffle is filled with adsorption filler. A set of air outlet holes are opened on the lower side wall of the square sleeve, and a circulation pipe connected to the set of air outlet holes is fixedly connected to the bottom of the square sleeve. The circulation pipe is connected to the interior of the protective dome. A sealing cover is installed at the end of the square sleeve away from the protective dome. The air pump is electrically connected to a controller.

[0014] Preferably, the welding unit includes an operation port on the outer wall of the protective dome, and an installation block is provided on the inner side of the operation port. A flexible protective sleeve is fixed between the side wall of the installation block and the side wall of the operation port. A detachable welding torch is installed on the end face of the installation block, and the welding end of the welding torch is located on the inner side of the protective dome. A transparent observation window is provided on the side wall of the protective dome at the position of the operation port.

[0015] Preferably, the thermal conductivity testing unit includes a pressure ring fixedly disposed on the inner wall of the protective circular cover. The sidewalls of the two semi-circular steel sleeves are integrally formed with semi-convex rings, which are coaxial with the pressure ring. An annular groove is formed at one end of the pressure ring near the semi-convex ring, and an annular heating strip is disposed inside the annular groove. An annular heat-conducting plate is fixedly installed at the opening of the annular groove. The pressure ring abuts against the front end plate of the cutting roller. Multiple arc-shaped grooves are formed at the ends of the two semi-convex rings near the pressure ring, and an arc-shaped heat-conducting block is installed at the opening of each arc-shaped groove. A temperature detection probe is installed inside each arc-shaped groove, and the measuring end of each temperature detection probe contacts the sidewall of the arc-shaped heat-conducting block on the same side. The two semi-convex rings abut against the tail end of the cutting roller. The annular heating strip and each temperature detection probe are electrically connected to the controller.

[0016] Preferably, the ventilation assembly includes a branch suction pipe fixedly inserted into the wall of the suction pipe, and a normally closed solenoid valve is installed inside the branch suction pipe. A normally open solenoid valve is installed inside the suction pipe on the side away from the air pump at the air inlet end of the branch suction pipe. A ventilation hole is opened on the side wall of the protective cover, and a ventilation control valve is installed inside the ventilation hole. After receiving an electrical signal output by at least one temperature detection probe, the controller controls the normally open solenoid valve, the normally closed solenoid valve, and the ventilation control valve to work.

[0017] Preferably, the magnetic fixing assembly includes an annular non-magnetic plate fixedly installed on the inner wall of the protective dome, and the annular non-magnetic plate has multiple fixing grooves on the side wall near the semi-annular steel sleeve. Each fixing groove has an arc-shaped non-magnetic plate slidably connected inside, and each arc-shaped non-magnetic plate has an arc-shaped electromagnetic block fixedly connected to its side wall. Multiple springs are fixed between the side wall of the arc-shaped non-magnetic plate and the bottom of the fixing groove on the same side. The arc-shaped electromagnetic block is electrically connected to the controller.

[0018] Preferably, the inner wall of the protective dome is provided with a light groove on one side of the transparent observation window, and a strip light is installed inside the light groove, the strip light being electrically connected to the controller.

[0019] Compared with existing technologies, the advantages of a welding device for the maintenance of underground coal mining machines are:

[0020] 1. Through the coordinated operation of the protective cover, controller, semi-ring steel clamp, connecting mechanism and welding unit, the cutting drum can be isolated from the external environment without disassembling it, preventing welding sparks from escaping and causing danger. This allows for direct welding and maintenance of the cutting drum on-site underground, without the need to disassemble or transport it. This significantly reduces the time required for cutting drum maintenance while maintaining the maintenance frequency, thus helping to maintain coal mining efficiency.

[0021] 2. The gas circulation unit can circulate and purify the air around the cutting drum, thereby adsorbing dangerous gases such as methane and hydrogen sulfide that may be present in the air, thus further improving the safety of welding.

[0022] 3. By setting up a thermal conductivity testing unit, the location of potential defects such as wear and tooth breakage on the cutting roller can be analyzed and tested before welding. This allows for the repair of all parts that need repair in a single maintenance, reducing the frequency of maintenance on the cutting roller and improving its operational stability. Furthermore, in conjunction with the set up ventilation components, the ventilation inside the protective cover can be automatically ventilated based on the test results of the thermal conductivity testing unit during the welding process, preventing insufficient oxygen concentration or excessive temperature inside the protective cover from affecting the welding repair effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a welding device for the maintenance of an underground coal mining machine provided by the present invention;

[0024] Figure 2 This is a cross-sectional structural schematic diagram of a welding device for the maintenance of an underground coal mining machine provided by the present invention;

[0025] Figure 3 This invention provides a welding device for the maintenance of underground coal mining machines. Figure 2 Enlarged view of the structure of section A;

[0026] Figure 4 This is a schematic diagram of the internal structure of the square sleeve of a welding device for the maintenance of an underground coal mining machine provided by the present invention;

[0027] Figure 5 This is a side view of the welding unit of a welding device for the maintenance of an underground coal mining machine provided by the present invention;

[0028] Figure 6 This is a schematic diagram of the connection structure of two semi-ring steel clamps for a welding device for the maintenance of an underground coal mining machine provided by the present invention.

[0029] Figure 7 This is an installation diagram of a welding device for the maintenance of an underground coal mining machine provided by the present invention.

[0030] In the diagram: 1. Protective circular cover; 2. Controller; 3. Semi-ring steel clamp; 4. Roller mounting base; 5. Cutting roller; 6. Connecting mechanism; 61. Mounting ring; 62. Magnetic fixing assembly; 621. Annular non-magnetic plate; 622. Fixing groove; 623. Arc-shaped non-magnetic plate; 624. Arc-shaped electromagnetic block; 625. Spring; 7. Gas circulation unit; 71. Square sleeve; 72. Air pump; 73. Suction pipe; 74. Baffle; 75. Adsorption packing; 76. Air outlet; 77. Circulation pipe; 78. Sealing cover; 8. Welding unit. 81 Operating port, 82 Mounting block, 83 Flexible protective sleeve, 84 Welding torch, 85 Transparent observation window, 9 Thermal conductivity test unit, 91 Pressure ring, 92 Semi-convex ring, 93 Annular groove, 94 Annular heating strip, 95 Annular heat-conducting plate, 96 Arc groove, 97 Arc heat-conducting block, 98 Temperature detection probe, 10 Ventilation assembly, 101 Suction tube, 102 Normally closed solenoid valve, 103 Normally open solenoid valve, 104 Ventilation port, 105 Ventilation solenoid valve, 11 Lamp slot, 12 Strip lamp. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] like Figures 1-7 As shown, a welding device for the maintenance of an underground coal mining machine includes a protective circular cover 1 and a controller 2 installed on the side wall of the protective circular cover 1. It also includes two mutually symmetrical semi-circular steel clamps 3, each of which is disposed on one side of the protective circular cover 1 and is used to clamp the outer side of the drum mounting seat 4. The protective circular cover 1 is fitted on the outer side of the cutting drum 5. The protective circular cover 1 is equipped with a connecting mechanism 6, and the protective circular cover 1 is connected to the two semi-circular steel clamps 3 through the connecting mechanism 6. The connecting mechanism 6 includes a mounting ring 61 that is rotatably fitted on the outer side of the protective circular cover 1, and the mounting ring 61 is detachably connected to the two semi-circular steel clamps 3. The inner side of the protective circular cover 1 is provided with a magnetic fixing component 62, and the magnetic fixing component 62 is magnetically fixed to the two semi-circular steel clamps 3.

[0033] The magnetic fixing assembly 62 includes an annular non-magnetic plate 621 fixedly installed on the inner wall of the protective dome 1. The annular non-magnetic plate 621 has multiple fixing grooves 622 on its side wall near the semi-annular steel sleeve 3. Each fixing groove 622 has an arc-shaped non-magnetic plate 623 slidably connected inside it. Each arc-shaped non-magnetic plate 623 has an arc-shaped electromagnetic block 624 fixedly connected to its side wall. Multiple springs 625 are fixed between the side wall of the arc-shaped non-magnetic plate 623 and the bottom of the fixing groove 622 on the same side. The arc-shaped electromagnetic block 624 is electrically connected to the controller 2. During the welding operation, in order to ensure the stability of the protective dome 1, the controller 2 controls each arc-shaped electromagnetic block 624 to be energized. At this time, each arc-shaped electromagnetic block 624 will be attracted to the corresponding semi-annular steel sleeve 3, thereby ensuring the stability of the protective dome 1.

[0034] The gas circulation unit 7 is installed on the outside of the protective dome 1 to circulate and purify the air inside the protective dome 1. The gas circulation unit 7 includes a square sleeve 71 fixedly installed on the outer wall of the protective dome 1, and an air pump 72 is installed inside the square sleeve 71. An air suction pipe 73 is fixedly connected to the suction end of the air pump 72 and is connected to the inside of the protective dome 1. A baffle 74 is installed on the side of the square sleeve 71 located at the air outlet end of the air pump 72. Adsorption filler 75 is filled on the side of the square sleeve 71 located away from the baffle 74. A set of air outlet holes 76 are opened on the lower side wall of the square sleeve 71. A circulation pipe 77 connected to the set of air outlet holes 76 is fixedly connected to the bottom of the square sleeve 71 and is connected to the inside of the protective dome 1. A sealing cover plate 78 is installed on the end of the square sleeve 71 away from the protective dome 1. The air pump 72 is electrically connected to the controller 2. The adsorption filler 75 is a filler with porous adsorption properties, such as activated carbon.

[0035] Welding unit 8 is set on the side wall of protective cover 1 and is used to weld and repair cutting roller 5. Welding unit 8 includes an operation port 81 opened on the outer side wall of protective cover 1, and an installation block 82 is provided on the inner side of operation port 81. A flexible protective sleeve 83 is fixed between the side wall of installation block 82 and the side wall of operation port 81. A detachable welding gun 84 is installed on the end face of installation block 82, and the welding end of welding gun 84 is located on the inner side of protective cover 1. A transparent observation window 85 is provided on the side wall of protective cover 1 on one side of operation port 81. The flexible protective sleeve 83 is made of high temperature resistant and fireproof material and has a certain degree of flexibility and stretchability.

[0036] A light trough 11 is provided on the inner wall of the protective dome 1 at one side of the transparent observation window 85, and a strip light 12 is installed inside the light trough 11. The strip light 12 is electrically connected to the controller 2, and can provide supplementary lighting for the inside of the protective dome 1.

[0037] The thermal conductivity testing unit 9 is located inside the protective dome 1. The thermal conductivity testing unit 9 includes a pressure ring 91 fixedly mounted on the inner wall of the protective dome 1. Two semi-circular steel sleeves 3 have integrally formed semi-convex rings 92 on their sidewalls, and the two semi-convex rings 92 are coaxial with the pressure ring 91. An annular groove 93 is formed at the end of the pressure ring 91 near the semi-convex ring 92, and an annular heating strip 94 is provided inside the annular groove 93. An annular heat-conducting plate 95 is fixedly installed at the opening of the annular groove 93. The pressure ring 91 abuts against the front end plate of the cutting roller 5. Multiple arc-shaped grooves 96 are formed at the end of each of the two semi-convex rings 92 near the pressure ring 91, and each arc-shaped groove 96 is fitted with a heat-conducting plate 95. There is an arc-shaped heat-conducting block 97, and each arc-shaped groove 96 has a temperature detection probe 98 installed inside. The temperature measuring end of each temperature detection probe 98 is in contact with the side wall of the arc-shaped heat-conducting block 97 on the same side. Two semi-convex rings 92 abut against the tail end of the cutting roller 5. The annular electric heating strip 94 and each temperature detection probe 98 are electrically connected to the controller 2. The temperature detection probe 98 can convert the temperature into an electrical signal and output it to the controller 2. After the temperature exceeds the threshold, it can automatically output an electrical signal to the controller 2. This is a mature existing technology, so it will not be described in detail here. The side wall of the pressure ring 91 has a vent hole for protecting the air circulation inside the circular cover 1.

[0038] The ventilation assembly 10 is located inside the gas circulation unit 7, and the controller 2 controls the ventilation assembly 10 to work according to the electrical signal output by the thermal conductivity test unit 9. The ventilation assembly 10 includes a branch suction pipe 101 fixedly inserted into the wall of the suction pipe 73, and a normally closed solenoid valve 102 is installed inside the branch suction pipe 101. A normally open solenoid valve 103 is installed inside the suction pipe 73 on the side away from the air pump 72 at the air inlet end of the branch suction pipe 101. A ventilation hole 104 is opened on the side wall of the protective cover 1, and a ventilation solenoid valve 105 is installed inside the ventilation hole 104. After receiving an electrical signal output by at least one temperature detection probe 98, the controller 2 controls the normally open solenoid valve 103, the normally closed solenoid valve 102 and the ventilation solenoid valve 105 to work. When the ventilation solenoid valve 105 is energized, its valve plate remains open; when de-energized, its valve plate remains closed.

[0039] The operating principle of this invention is explained as follows: When it is necessary to repair and weld the components at the cutting drum 5 of the coal mining machine, the coal mining machine is moved to a suitable position, and the cutting drum 5 is lowered to a height of about 1 meter by the rocker arm. Then, the coal mining machine is powered off and stopped, and the coal slag, oil stains, etc. on the surface of the cutting drum 5 that needs to be repaired are cleaned to avoid affecting subsequent welding. After all the preparations are completed, the two semi-circular steel clamps 3 are clamped on the outside of the drum mounting base 4, and then the protective cover 1 is put on the outside of the cutting drum 5 (refer to...). Figure 7 First, install two semi-circular steel sleeves 3 in the direction of the dotted line F1, then install the protective cover 1 in the direction of the dotted line F2, and lock the mounting ring 61 and the two semi-circular steel sleeves 3 together with locking parts (locking parts are screws, nuts, etc.). Since the semi-circular steel sleeves 3 and the protective cover 1 are locked together, the pressing ring 91 will abut against the front end plate of the cutting roller 5, and the semi-convex ring 92 will abut against the tail end of the cutting roller 5. Then, connect the controller 2 to the external power supply and start the controller 2.

[0040] After the controller 2 starts, it will first control the air pump 72 to work for 5 minutes at a set time. The air pump 72 will draw air out of the protective cover 1 through the air intake pipe 73 and deliver the airflow to the adsorption packing 75. Then, the airflow will be returned to the interior of the protective cover 1 through the air outlet 76 and the circulation pipe 77. When the airflow passes through the adsorption packing 75, any gas, hydrogen sulfide, coal dust, etc. that may be contained in the airflow will be adsorbed by the adsorption packing 75, thereby removing hazardous substances from the airflow. After the air pump 72 finishes its timed operation, the controller 2 will immediately control the annular electric heating bar 94 to start working. The annular electric heating bar 94 will heat the annular heat-conducting plate 95. The temperature is 70℃±1℃. The annular heat-conducting plate 95 conducts heat through the cutting roller 5 to the arc-shaped heat-conducting block 97. The temperature detection probe 98 can detect the temperature of the arc-shaped heat-conducting block 97 in real time. When the cutting roller 5 is not worn, the heat conduction path is complete, and more heat can be conducted to the arc-shaped heat-conducting block 97 at the corresponding location. Therefore, the temperature detected by the temperature detection probe 98 at this location is moderate. However, at the worn location of the cutting roller 5, the wear increases the contact area with air at this location, so more heat is lost during conduction. Therefore, the temperature detected by the temperature detection probe 98 at this location is lower. The temperature reading is too low, and when the weld of the cutting tooth breaks, a gap appears at the connection between the cutting tooth and the spiral blades on the cutting drum 5. Heat conduction is hindered, so heat is not easily dissipated compared to an intact cutting tooth. Therefore, the temperature detected by the temperature sensor 98 at the corresponding location is too high. After the controller 2 controls the annular heating strip 94 to work for 4 minutes, the controller 2 will connect the circuit with each temperature sensor 98. The temperature sensor 98 can convert the temperature into an electrical signal and output it to the controller 2. The controller 2 then marks the corresponding position on its display screen according to the strength of the electrical signal output by each temperature sensor 98. (For example, the controller 2 display will show a simulated image of the cutting drum 5, with markers at the corresponding positions of each temperature detection probe 98. The markers are green when the temperature is moderate, red when the temperature is high, and yellow when the temperature is low.) Based on the marker information, the staff can know which positions of the cutting drum 5 may need welding repair, thus guiding the staff to repair all the necessary positions in one repair (the annular heating strip 94 heats the cutting drum 5 and can also preheat the cutting drum 5 before welding, reducing the thermal stress generated by welding and helping to improve the welding repair effect).

[0041] After the annular heating strip 94 has been working for 4 minutes, the controller 2 stops the annular heating strip 94. Then, the operator rotates the protective cover 1 according to the display marks on the controller 2, so that the transparent observation window 85 is rotated to the position that needs to be repaired. The operator then observes the cutting teeth, blades, and other positions that need to be welded and repaired through the transparent observation window 85. (After the controller 2 is started, it will simultaneously control the strip light 12 to work. The strip light 12 can provide supplementary lighting around the transparent observation window 85, so that the operator can easily see the position that needs to be welded and repaired.) Then, the operator uses the welding gun 84 to repair the position that needs to be repaired. Since the welding gun 84 is connected to the protective cover 1 through the mounting block 82 and the flexible protective sleeve 83, and the flexible protective sleeve 83 has the characteristics of being soft and stretchable, it will not affect the movement, tilting, or other operations of the welding gun 84. Therefore, the welding gun 84 can be used to perform welding repair work on the cutting roller 5. (Due to the obstruction of the protective cover 1, the welding sparks generated during welding cannot escape to the external environment, so there is no danger caused by welding sparks, ensuring the safety of on-site welding.)

[0042] Secondly, when controller 2 stops the annular heating strip 94, it will control air pump 72 to start working again. During welding, air pump 72 can extract the welding fumes and purify them through adsorption filler 75, preventing the welding fumes from affecting the operator's vision. When there are many welding positions on the cutting roller 5, the high temperature generated by welding will gradually accumulate inside the protective cover 1. At this time, temperature detection probe 98 will detect the temperature rise. After the temperature rises to the threshold (e.g., 80℃), temperature detection probe 98 will automatically output a warning signal to controller 2. At this time, controller 2 will provide a voice prompt through its own voice module, and the operator should stop welding work in time. Controller 2 will delay for 1 minute to control normally closed solenoid valve 102, normally open solenoid valve 103 and ventilation solenoid valve 105 to be energized. Normally closed solenoid valve 102 will be energized to open, normally open solenoid valve 103 will be energized to close, and ventilation solenoid valve 105 will be energized to close. When the power is turned on at 05, the air pump 72 draws in external air through the suction pipe 73 and the branch suction pipe 101. After being filtered by the adsorption packing 75, the external air is delivered to the inside of the protective dome 1 through the air outlet 76 and the circulation pipe 77. The air inside the protective dome 1 is discharged through the ventilation hole 104. This reduces the temperature inside the protective dome 1 and restores the oxygen concentration inside the protective dome 1, ensuring welding stability. As the temperature inside the protective dome 1 decreases, the electrical signal output by the temperature detection probe 98 to the controller 2 disappears. At this time, the controller 2 will delay for 2 minutes and provide a voice prompt through its own voice module, reminding the personnel that welding can continue. At the same time, the controller 2 controls the normally closed solenoid valve 102, the normally open solenoid valve 103 and the ventilation control valve 105 to stop working. At this time, the air inside the protective dome 1 continues to circulate through the air pump 72 until the electrical signal output by the temperature detection probe 98 is received again.

[0043] After the welding repairs were completed at the locations on the cutting drum 5 that required them, the workers shut down the controller 2 and removed the protective cover 1 and the semi-circular steel sleeve 3 from the cutting drum 5. This completed the welding repair work on the cutting drum 5 at the underground coal mining site.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for the maintenance of an underground coal mining machine, comprising a protective shield (1) and a controller (2) mounted on the side wall of the protective shield (1), characterized in that, Also includes: Two symmetrical semi-circular steel sleeves (3) are set on one side of the protective cover (1) for fitting on the outside of the roller mounting seat (4). The protective cover (1) is fitted on the outside of the cutting roller (5). The protective cover (1) is equipped with a connecting mechanism (6), and the protective cover (1) is connected to the two semi-circular steel sleeves (3) through the connecting mechanism (6). A gas circulation unit (7) is installed on the outside of the protective dome (1) to circulate and purify the air inside the protective dome (1); Welding unit (8) is set on the side wall of protective cover (1) and is used to weld and repair the cutting drum (5); The thermal conductivity testing unit (9) is located inside the protective dome (1); The ventilation assembly (10) is located inside the gas circulation unit (7), and the controller (2) controls the ventilation assembly (10) to work according to the electrical signal output by the thermal conductivity test unit (9); The thermal conductivity testing unit (9) includes a pressure ring (91) fixedly installed on the inner wall of the protective circular cover (1). The side walls of the two semi-circular steel sleeves (3) are integrally formed with semi-convex rings (92), and the two semi-convex rings (92) are coaxial with the pressure ring (91). An annular groove (93) is provided at one end of the pressure ring (91) near the semi-convex ring (92), and an annular heating strip (94) is provided inside the annular groove (93). An annular heat-conducting plate (95) is fixedly installed at the opening of the annular groove (93). The pressure ring (91) is aligned with the front end plate of the cutting roller (5). The two semi-convex rings (92) are provided with multiple arc-shaped grooves (96) at one end near the pressure ring (91), and each arc-shaped groove (96) is equipped with an arc-shaped heat-conducting block (97). Each arc-shaped groove (96) is equipped with a temperature detection probe (98), and the temperature measuring end of each temperature detection probe (98) is in contact with the side wall of the arc-shaped heat-conducting block (97) on the same side. The two semi-convex rings (92) abut against the tail end of the cutting roller (5). The annular electric heating strip (94) and each temperature detection probe (98) are electrically connected to the controller (2).

2. The welding device for the maintenance of an underground coal mining machine according to claim 1, characterized in that, The connecting mechanism (6) includes a mounting ring (61) that is rotatably sleeved on the outside of the protective cover (1), and the mounting ring (61) is detachably connected to two semi-circular steel sleeves (3). The inner side of the protective cover (1) is provided with a magnetic fixing component (62), and the magnetic fixing component (62) is magnetically fixed to the two semi-circular steel sleeves (3).

3. The welding device for the maintenance of an underground coal mining machine according to claim 1, characterized in that, The gas circulation unit (7) includes a square sleeve (71) fixedly installed on the outer wall of the protective dome (1), and an air pump (72) is installed inside the square sleeve (71). The air pump (72) is fixedly connected to an air suction pipe (73) at its suction end, and the air suction pipe (73) is connected to the inside of the protective dome (1). A baffle (74) is installed inside the square sleeve (71) on one side of the air pump (72) at its outlet end, and the inside of the square sleeve (71) is away from the air pump (72) at the baffle (74). The pump (72) is filled with adsorption packing (75) on one side. The lower side wall of the square sleeve (71) is provided with a set of air outlets (76). The bottom of the square sleeve (71) is fixedly connected with a circulation pipe (77) that communicates with the set of air outlets (76). The circulation pipe (77) is connected to the inside of the protective round cover (1). A sealing cover plate (78) is installed at the end of the square sleeve (71) away from the protective round cover (1). The air pump (72) is electrically connected to the controller (2).

4. The welding device for the maintenance of an underground coal mining machine according to claim 1, characterized in that, The welding unit (8) includes an operation port (81) opened on the outer wall of the protective dome (1), and an installation block (82) is provided on the inner side of the operation port (81). A flexible protective sleeve (83) is fixed between the side wall of the installation block (82) and the side wall of the operation port (81). A detachable welding torch (84) is installed on the end face of the installation block (82), and the welding end of the welding torch (84) is located on the inner side of the protective dome (1). A transparent observation window (85) is provided on the side wall of the protective dome (1) on the side of the operation port (81).

5. A welding device for the maintenance of an underground coal mining machine according to claim 3, characterized in that, The ventilation assembly (10) includes a branch suction pipe (101) fixedly inserted into the wall of the suction pipe (73), and a normally closed solenoid valve (102) is installed inside the branch suction pipe (101). A normally open solenoid valve (103) is installed inside the suction pipe (73) on the side away from the air pump (72) at the air inlet end of the branch suction pipe (101). A ventilation hole (104) is opened on the side wall of the protective cover (1), and a ventilation control valve (105) is installed inside the ventilation hole (104). After receiving an electrical signal output by at least one temperature detection probe (98), the controller (2) controls the normally open solenoid valve (103), the normally closed solenoid valve (102) and the ventilation control valve (105) to work.

6. The welding device for maintenance of an underground coal mining machine according to claim 2, characterized in that, The magnetic fixing assembly (62) includes an annular non-magnetic plate (621) fixedly installed on the inner wall of the protective circular cover (1). The annular non-magnetic plate (621) has multiple fixing grooves (622) on the side wall near the semi-annular steel sleeve (3). Each fixing groove (622) has an arc-shaped non-magnetic plate (623) slidably connected inside. Each arc-shaped non-magnetic plate (623) has an arc-shaped electromagnetic block (624) fixedly connected to the side wall. Multiple springs (625) are fixed between the side wall of the arc-shaped non-magnetic plate (623) and the bottom of the fixing groove (622) on the same side. The arc-shaped electromagnetic block (624) is electrically connected to the controller (2).

7. The welding device for the maintenance of an underground coal mining machine according to claim 4, characterized in that, The inner wall of the protective dome (1) is provided with a light groove (11) on one side of the transparent observation window (85), and a strip light (12) is installed inside the light groove (11). The strip light (12) is electrically connected to the controller (2).

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