Welding device for maintenance of underground coal mining machine

Abstract

The invention belongs to the technical field of maintenance welding equipment, and particularly relates to a welding device for maintenance of an underground coal mining machine, which comprises a protective circular cover and a controller mounted on the side wall of the protective circular cover, and further comprises two symmetrical semi-ring steel clamping sleeves arranged on one side of the protective circular cover, the two semi-ring steel clamping sleeves are arranged on the outer side of a roller mounting base in a clamping and sleeving mode, the cutting roller is sleeved with the circular protection cover, the circular protection cover is provided with a connecting mechanism and connected with the two semi-ring steel clamping sleeves through the connecting mechanism, and the gas circulation unit is installed on the outer side of the circular protection cover and connected with the two semi-ring steel clamping sleeves through the connecting mechanism. The air purification device is used for circularly purifying air in the protective circular cover. According to the method, the maintenance frequency of the cutting drum of the coal mining machine can be reduced, the cutting drum can be welded and maintained on the underground site, disassembly, assembly and transportation are not needed, the influence on the coal mining efficiency is reduced, and meanwhile, the method has excellent maintenance safety.

Description

Technical Field

[0001] The invention belongs to the technical field of maintenance welding equipment, and in particular relates to a maintenance welding device for an underground coal mining machine. Background Art

[0002] Coal mining machines are vital in coal mining, but they are in harsh underground working conditions for a long time, such as high-load operation, coal dust erosion, humid environment, etc., which are prone to damage such as component wear and cracking. These problems will affect the normal operation of the coal mining machine and reduce mining efficiency. Welding maintenance is a key means to ensure that the coal mining machine continues to work stably. It can repair damaged key structures such as the cutting part and traction part and restore their performance, which is of great significance to the continuous production of coal mines.

[0003] At present, the cutting part of the coal mining machine needs to directly act on the working surface to cut off the coal blocks, so the cutting part of the coal mining machine wears quickly and has a high maintenance frequency. When repairing the cutting part, welding equipment is needed, such as a welding processing equipment for coal mining machinery maintenance disclosed in patent announcement number CN114559201B;

[0004] Since the coal mining machine is located underground in the coal mine, and there are flammable and explosive substances such as gas and coal dust at the underground coal mining site, the cutting drum needs to be disassembled when the coal mining machine is repaired, and then transported to the ground or to a safe area underground for welding repair. First of all, for easily worn components such as the cutting teeth on the cutting drum, if welding repairs are performed frequently, the cutting drum needs to be disassembled and transported at a high frequency, which affects the coal mining efficiency to a certain extent. Secondly, if the maintenance frequency is reduced, the cutting efficiency of the damaged cutting teeth on the coal blocks will decrease, which will also affect the coal mining efficiency. Summary of the invention

[0005] The object of the present invention is to provide a welding device for repairing an underground coal mining machine in view of the above-mentioned problems.

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

[0007] Two mutually symmetrical half-ring steel ferrules are both arranged on one side of the protective round cover and are used to be ferruled on the outside of the drum mounting seat. The protective round cover is sleeved on the outside of the cutting drum. The protective round cover is installed with a connecting mechanism, and the protective round cover is connected to the two half-ring steel ferrules through the connecting mechanism.

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

[0009] A welding unit, arranged on the side wall of the protective dome, is used for welding and repairing the cutting drum;

[0010] A thermal conductivity test unit is arranged inside the protective dome;

[0011] The ventilation component is arranged inside the gas circulation unit, and the controller controls the operation of the ventilation component according to the electrical signal output by the thermal conductivity testing unit.

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

[0013] Preferably, the gas circulation unit includes a square sleeve fixedly mounted on the outer wall of the protective hood, and an air pump is installed inside the square sleeve, a suction end of the air pump is fixedly connected with a suction pipe, and the suction pipe is communicated with the interior of the protective hood, a baffle is installed on the side of the air outlet end of the air pump inside the square sleeve, and the interior of the square sleeve is filled with adsorption filler on the side of the baffle away from the air pump, a group of air outlet holes are opened on the lower side wall of the square sleeve, and a circulation pipe connected to the group of air outlet holes is fixedly connected to the bottom of the square sleeve, the circulation pipe is communicated with the interior of the protective hood, a sealing cover is installed on the end of the square sleeve away from the protective hood, and the air pump is electrically connected to the controller.

[0014] Preferably, the welding unit includes an operating port opened on the outer wall of the protective hood, and a mounting block is provided on the inner side of the operating port, a flexible protective cover is fixedly provided between the side wall of the mounting block and the side wall of the operating port, a detachable welding gun is installed on the end face of the mounting block, and the welding end of the welding gun is arranged on the inner side of the protective hood, and a transparent observation window is provided on the side wall of the protective hood at one side of the operating port.

[0015] Preferably, the thermal conductivity testing unit includes a pressure ring fixedly arranged on the inner wall of the protective circular cover, the side walls of the two semi-ring steel ferrules are integrally formed with semi-convex rings, and the two semi-convex rings are coaxial with the pressure ring, an annular groove is provided at one end of the pressure ring close to the semi-convex ring, and an annular electric heating strip is provided inside the annular groove, an annular heat conducting plate is fixedly installed at the notch of the annular groove, the pressure ring abuts against the front end plate of the cutting drum, a plurality of arc grooves are provided at one end of the two semi-convex rings close to the pressure ring, and an arc-shaped heat conducting block is installed at the notch of each arc groove, a temperature detection probe is installed inside each arc groove, and the temperature measuring end of each temperature detection probe is in contact with the side wall of the arc-shaped heat conducting block on the same side, the two semi-convex rings abut against the tail end of the cutting drum, and the annular electric heating strip and each temperature detection probe are electrically connected to the controller.

[0016] Preferably, the ventilation component includes a branch suction pipe fixedly inserted into the wall of the intake pipe, and a normally closed solenoid valve is installed inside the branch suction pipe, a normally open solenoid valve is installed inside the intake pipe at a side of the intake end of the branch suction pipe away from the air pump, a ventilation hole is opened on the side wall of the protective circular cover, and a ventilation electric-controlled valve is installed inside the ventilation hole, and after the controller receives the electrical signal output by at least one temperature detection probe, it controls the operation of the normally open solenoid valve, the normally closed solenoid valve and the ventilation electric-controlled valve.

[0017] Preferably, the magnetic fixing component includes an annular non-magnetic plate fixedly mounted on the inner wall of the protective circular cover, and a plurality of fixing grooves are provided on the side wall of the annular non-magnetic plate close to the semi-ring steel ferrule, each of the fixing grooves is slidably connected to an arc-shaped non-magnetic plate, and the side wall of each arc-shaped non-magnetic plate is fixedly connected to an arc-shaped electromagnetic block, a plurality of springs are fixedly provided between the side wall of the arc-shaped non-magnetic plate and the bottom of the fixing groove on the same side, and the arc-shaped electromagnetic block is electrically connected to the controller.

[0018] Preferably, a light trough is provided on the inner wall of the protective circular cover at a position on one side of the transparent observation window, and a strip light is installed inside the light trough, and the strip light is electrically connected to the controller.

[0019] Compared with the existing technology, the advantages of a welding device for repairing an underground coal mining machine are:

[0020] 1. Through the cooperation of the protective circular cover, controller, semi-ring steel ferrule, connecting mechanism and welding unit, the cutting drum can be isolated from the external environment without disassembling the cutting drum, avoiding the danger caused by the escape of welding sparks. The cutting drum can be welded and repaired directly on site underground without disassembling the cutting drum or transporting the cutting drum. The time required for repairing the cutting drum can be greatly shortened while maintaining the maintenance frequency, which is conducive to maintaining coal mining efficiency.

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

[0022] 3. Through the set thermal conductivity test unit, the positions of possible defects such as wear and tooth breakage of the cutting drum can be analyzed and tested before welding, so that all the parts that need to be repaired can be repaired as much as possible in one maintenance, which is conducive to reducing the maintenance frequency of the cutting drum and improving the working stability of the cutting drum. Secondly, in conjunction with the set ventilation component, the inside of the protective hood can be automatically ventilated based on the test results of the thermal conductivity test unit during the welding process, so as to avoid insufficient oxygen concentration and excessive temperature in the protective hood that affect the effect of welding maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0025] Figure 3 The invention provides a welding device for repairing an underground coal mining machine. Figure 2 A magnified view of the structure of part A;

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

[0027] Figure 5 It is a side structural schematic diagram of a welding unit of a welding device for repairing an underground coal mining machine provided by the present invention;

[0028] Figure 6 It is a schematic diagram of the connection structure of two half-ring steel ferrules of a welding device for repairing an underground coal mining machine provided by the present invention;

[0029] Figure 7 The utility model is a schematic diagram of the installation of a welding device for repairing an underground coal mining machine provided by the present invention.

[0030] In the figure: 1 protective round cover, 2 controller, 3 half-ring steel ferrule, 4 roller mounting seat, 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 filler, 76 air outlet, 77 circulation pipe, 78 sealing cover plate, 8 welding unit, 81 operation port, 82 mounting block, 83 flexible protective cover, 84 welding gun, 85 transparent observation window, 9 thermal conductivity test unit, 91 pressure ring, 92 semi-convex ring, 93 annular groove, 94 annular electric heating strip, 95 annular heat conductive plate, 96 arc groove, 97 arc-shaped heat conductive block, 98 temperature detection probe, 10 ventilation assembly, 101 suction pipe, 102 normally closed solenoid valve, 103 normally open solenoid valve, 104 ventilation hole, 105 ventilation electric control valve, 11 lamp trough, 12 strip lamp. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] like Figure 1-Figure 7 As shown, a welding device for maintenance of an underground coal mining machine includes a protective hood 1 and a controller 2 installed on the side wall of the protective hood 1, and also includes: two symmetrical semi-ring steel ferrules 3, the two symmetrical semi-ring steel ferrules 3 are both arranged on one side of the protective hood 1, and are used to be ferruled on the outside of the drum mounting seat 4, the protective hood 1 is sleeved on the outside of the cutting drum 5, the protective hood 1 is installed with a connecting mechanism 6, and the protective hood 1 is connected to the two semi-ring steel ferrules 3 through the connecting mechanism 6, the connecting mechanism 6 includes a mounting ring 61 rotatably sleeved on the outside of the protective hood 1, and the mounting ring 61 is detachably connected to the two semi-ring steel ferrules 3, a magnetic fixing component 62 is provided on the inner side of the protective hood 1, and the magnetic fixing component 62 is magnetically fixed to the two semi-ring steel ferrules 3.

[0033] The magnetic fixing component 62 includes an annular non-magnetic plate 621 fixedly installed on the inner wall of the protective circular cover 1, and a plurality of fixing grooves 622 are opened on the side wall of the annular non-magnetic plate 621 close to the half-ring steel ferrule 3, and each fixing groove 622 is slidably connected to the inside of an arc-shaped non-magnetic plate 623, and each arc-shaped non-magnetic plate 623 is fixedly connected to the side wall with an arc-shaped electromagnetic block 624, and a plurality of springs 625 are fixedly provided between the side wall of the arc-shaped non-magnetic plate 623 and the bottom of the fixing groove 622 on the same side, and the arc-shaped electromagnetic block 624 is electrically connected to the controller 2. When performing welding operations, in order to ensure the stability of the protective circular cover 1, each arc-shaped electromagnetic block 624 is energized by controlling the controller 2, and at this time, each arc-shaped electromagnetic block 624 will be adsorbed on the corresponding half-ring steel ferrule 3, thereby ensuring the stability of the protective circular cover 1.

[0034] The gas circulation unit 7 is installed on the outer side of the protective circular cover 1, and is used for circulating and purifying the air inside the protective circular cover 1. The gas circulation unit 7 includes a square sleeve 71 fixedly installed on the outer side wall of the protective circular cover 1, and an air pump 72 is installed inside the square sleeve 71, and an air suction end of the air pump 72 is fixedly connected to an air suction pipe 73, and the air suction pipe 73 is connected to the interior of the protective circular cover 1. A baffle 74 is installed on the side of the air outlet end of the air pump 72 inside the square sleeve 71, and the inside of the square sleeve 71 is filled with an adsorption filler 75 at a position on the side of the baffle 74 away from the air pump 72. A group of air outlet holes 76 are opened on the lower side wall of the square sleeve 71, and a circulation pipe 77 connected to the group of air outlet holes 76 is fixedly connected to the bottom of the square sleeve 71, and the circulation pipe 77 is connected to the interior of the protective circular cover 1. A sealing cover plate 78 is installed on the end of the square sleeve 71 away from the protective circular cover 1, the air pump 72 is electrically connected to the controller 2, and the adsorption filler 75 is a filler with porous adsorption performance such as activated carbon.

[0035] The welding unit 8 is arranged on the side wall of the protective hood 1, and is used for welding and repairing the cutting drum 5. The welding unit 8 includes an operation port 81 opened on the outer wall of the protective hood 1, and a mounting block 82 is provided on the inner side of the operation port 81, and a flexible protective cover 83 is fixedly provided between the side wall of the mounting block 82 and the side wall of the operation port 81, a detachable welding gun 84 is installed on the end face of the mounting block 82, and the welding end of the welding gun 84 is arranged on the inner side of the protective hood 1, and a transparent observation window 85 is provided on the side wall of the protective hood 1 at one side of the operation port 81, and the flexible protective cover 83 is made of high temperature resistant and fireproof material, and has certain flexibility and stretchability.

[0036] The inner wall of the protective dome 1 is provided with a light trough 11 at a position on 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 the interior of the protective dome 1 can be supplemented with light through the strip light 12 .

[0037] The thermal conductivity test unit 9 is arranged inside the protective hood 1. The thermal conductivity test unit 9 includes a pressure ring 91 fixedly arranged on the inner wall of the protective hood 1. The side walls of the two semi-ring steel ferrules 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 close to the semi-convex ring 92, and an annular electric heating strip 94 is provided inside the annular groove 93. An annular heat conducting plate 95 is fixedly installed at the notch of the annular groove 93. The pressure ring 91 is abutted against the front end plate of the cutting drum 5. A plurality of arc grooves 96 are provided at one end of the two semi-convex rings 92 close to the pressure ring 91, and the notch of each arc groove 96 is installed. There is an arc-shaped heat-conducting block 97, and a temperature detection probe 98 is installed inside each arc-shaped groove 96, 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 are against the tail end of the cutting drum 5, and 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, and after the temperature exceeds the threshold, it can automatically output an electrical signal to the controller 2. This is an existing mature technology, so it will not be elaborated here. Among them, a vent is left on the side wall of the pressure ring 91 for air circulation inside the protective hood 1.

[0038] The ventilation component 10 is arranged inside the gas circulation unit 7, and the controller 2 controls the operation of the ventilation component 10 according to the electrical signal output by the thermal conductivity testing unit 9. The ventilation component 10 includes a branch suction pipe 101 fixedly plugged 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 at a side of the air inlet end of the branch suction pipe 101 away from the air pump 72. A ventilation hole 104 is opened on the side wall of the protective hood 1, and a ventilation electric control valve 105 is installed inside the ventilation hole 104. After receiving the electrical signal output by at least one temperature detection probe 98, the controller 2 controls the operation of the normally open solenoid valve 103, the normally closed solenoid valve 102 and the ventilation electric control valve 105. When the ventilation electric control valve 105 is energized, its valve plate remains in an open state, and when the power is off, its valve plate remains in a closed state.

[0039] The operating principle of the present invention is now described 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, and 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 the subsequent welding. After all the preparatory work is completed, the two half-ring steel ferrules 3 are clamped on the outside of the drum mounting seat 4, and then the protective round cover 1 is sleeved on the outside of the cutting drum 5 (refer to Figure 7 First, install two half-ring steel ferrules 3 in the direction of the dotted line F1, then install the protective round cover 1 in the direction of the dotted line F2), and lock and fix the installation ring 61 and the two half-ring steel ferrules 3 together through the locking member (the locking member is a screw, nut, etc.), and because the half-ring steel ferrules 3 and the protective round cover 1 are locked and fixed together, the pressing ring 91 will abut against the front end plate of the cutting drum 5, and the semi-convex ring 92 will abut against the rear end of the cutting drum 5, then, connect the controller 2 to the external power supply, and start the controller 2;

[0040] After the controller 2 is started, it will first control the air pump 72 to work for 5 minutes. The air suction end of the air pump 72 will extract the air inside the protective dome 1 through the air suction pipe 73, and transport the airflow to the adsorption filler 75, and then return the airflow to the inside of the protective dome 1 through the air outlet 76 and the circulation pipe 77. When the airflow passes through the adsorption filler 75, the gas, hydrogen sulfide, coal dust, etc. that may be contained in the airflow will be adsorbed by the adsorption filler 75, so that the dangerous substances in the airflow can be removed. After the air pump 72 finishes working at the scheduled time, the controller 2 will immediately control the annular electric heating strip 94 to start working, and the annular electric heating strip 94 will heat the annular heat conducting plate 95 (heating The temperature is 70℃±1℃), and the annular heat conducting plate 95 will conduct the heat to the arc-shaped heat conducting block 97 through the cutting drum 5, and the temperature detection probe 98 can detect the temperature of the arc-shaped heat conducting block 97 in real time. When the cutting drum 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 position. Therefore, the temperature detected by the temperature detection probe 98 at this position is moderate. At the position where the cutting drum 5 is worn, the wear will increase the contact area between the position and the air, so the heat is lost more in the process of conduction, so the temperature detected by the temperature detection probe 98 at this position is When the pick weld is broken, a gap appears at the connection between the pick and the spiral blade on the cutting drum 5 due to the broken pick weld. At this time, heat conduction is blocked, so compared with the intact pick, heat is not easy to dissipate. Therefore, the temperature detected by the temperature detection probe 98 at the corresponding position is high. After the controller 2 controls the annular electric heating strip 94 to work for 4 minutes, the controller 2 will connect the connection circuit with each temperature detection probe 98. The temperature detection probe 98 can convert the temperature into an electrical signal and output it to the controller 2. The controller 2 will mark the corresponding position on its own display screen according to the strength of the electrical signal output by each temperature detection probe 98. (For example, the display screen of the controller 2 will display an image of a simulated cutting drum 5, and punctuation marks will be displayed at the positions corresponding to the temperature detection probes 98. When the temperature is moderate, the punctuation marks are green, when the temperature is high, the punctuation marks are red, and when the temperature is low, the punctuation marks are yellow). The staff can know which positions of the cutting drum 5 may need welding repair based on the punctuation mark information, so as to guide the staff to repair all the positions that need repair in one repair as much as possible (wherein, the annular electric heating strip 94 heats the cutting drum 5, and can also preheat the cutting drum 5 before welding, reduce the thermal stress generated by welding, and help improve the welding repair effect);

[0041] After the annular electric heating strip 94 has been working for 4 minutes, the controller 2 controls the annular electric heating strip 94 to stop working, and then the staff rotates the protective round cover 1 according to the display mark on the controller 2, so that the transparent observation window 85 rotates to the position where maintenance is required, and then the staff observes the positions of the picks, blades, etc. that need welding repair through the transparent observation window 85 (after the controller 2 is started, the strip light 12 will be synchronously controlled to work, and the strip light 12 can fill light around the transparent observation window 85, so that it is convenient for the staff to view the positions that need welding repair), and then the staff holds the welding gun 84 to repair the positions that need to be repaired. Since the welding gun 84 is connected to the protective round cover 1 through the mounting block 82 and the flexible protective cover 83, and the flexible protective cover 83 has the characteristics of being soft and stretchable, it will not affect the movement, tilting and other operations of the welding gun 84, so the welding gun 84 can be used to perform welding repair work on the cutting drum 5 (due to the obstruction of the protective round cover 1, the welding sparks generated during welding cannot escape to the external environment, so there will be no danger caused by the welding sparks, ensuring the safety of on-site welding);

[0042] Secondly, when the controller 2 controls the annular electric heating strip 94 to stop working, the controller 2 will control the air pump 72 to start working again. During welding, the air pump 72 can extract the smoke generated by welding, and adsorb and purify the welding smoke through the adsorption filler 75 to prevent the welding smoke from affecting the staff's line of sight. When there are many positions that need to be welded on the cutting drum 5, the high temperature generated by welding will gradually accumulate inside the protective dome 1. At this time, the temperature detection probe 98 will detect the temperature rise. After the temperature rises to the threshold (for example, 80°C), the temperature detection probe 98 will automatically output a warning signal to the controller 2. At this time, the controller 2 will use its own voice module to give a voice prompt, and the personnel should stop welding in time. The controller 2 will delay for 1 minute to control the normally closed solenoid valve 102, the normally open solenoid valve 103 and the ventilation electric control valve 105 to energize. The normally closed solenoid valve 102 is energized to open, the normally open solenoid valve 103 is energized to close, and the ventilation electric control valve 105 is energized to close. 05 is powered on. At this time, the air pump 72 inhales the external air through the suction pipe 73 and the branch suction pipe 101, and after being filtered by the adsorption filler 75, the external air is transported to the inside of the protective dome 1 through the air outlet 76 and the circulation pipe 77, while the air inside the protective dome 1 is discharged through the ventilation hole 104. On the one hand, it can reduce the temperature inside the protective dome 1, and on the other hand, it can restore the oxygen concentration of the air inside the protective dome 1 to ensure the 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 to give a voice prompt through its own voice module, prompting the personnel to continue welding. At the same time, the controller 2 controls the normally closed solenoid valve 102, the normally open solenoid valve 103 and the ventilation electric 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 cutting drum 5 is repaired at the position where welding is required, the staff shuts down the controller 2 and removes the protective round cover 1 and the semi-ring steel sleeve 3 from the cutting drum 5, thus completing the welding maintenance 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding device for maintenance of an underground coal mining machine, comprising a protective hood (1) and a controller (2) mounted on a side wall of the protective hood (1), characterized in that: Also includes: Two mutually symmetrical half-ring steel ferrules (3) are both arranged on one side of the protective hood (1) and are used to be ferruled on the outside of the drum mounting seat (4). The protective hood (1) is sleeved on the outside of the cutting drum (5). The protective hood (1) is equipped with a connecting mechanism (6), and the protective hood (1) is connected to the two half-ring steel ferrules (3) via the connecting mechanism (6). A gas circulation unit (7) is installed on the outside of the protective hood (1) and is used to circulate and purify the air inside the protective hood (1); A welding unit (8) is arranged on the side wall of the protective hood (1) and is used for welding and repairing the cutting drum (5); A thermal conductivity testing unit (9) is arranged inside the protective hood (1); The ventilation component (10) is arranged inside the gas circulation unit (7), and the controller (2) controls the operation of the ventilation component (10) according to the electrical signal output by the thermal conductivity testing unit (9).

2. A welding device for repairing an underground coal mining machine according to claim 1, characterized in that: The connecting mechanism (6) comprises a mounting ring (61) rotatably mounted on the outside of the protective hood (1), and the mounting ring (61) is detachably connected to two half-ring steel ferrules (3); a magnetic fixing component (62) is provided on the inner side of the protective hood (1), and the magnetic fixing component (62) is magnetically fixed to the two half-ring steel ferrules (3).

3. A welding device for repairing an underground coal mining machine according to claim 1, characterized in that: The gas circulation unit (7) comprises a square sleeve (71) fixedly mounted on the outer side wall of the protective hood (1), and an air pump (72) is mounted inside the square sleeve (71), an air suction end of the air pump (72) is fixedly connected to an air suction pipe (73), and the air suction pipe (73) is connected to the inside of the protective hood (1), and a baffle (74) is mounted inside the square sleeve (71) on one side of the air outlet end of the air pump (72), and the inside of the square sleeve (71) is located away from the baffle (74) and away from the air. One side of the pump (72) is filled with an adsorption filler (75), a group of air outlet holes (76) are opened on the lower side wall of the square sleeve (71), and a circulation pipe (77) connected to the group of air outlet holes (76) is fixedly connected to the bottom of the square sleeve (71), and the circulation pipe (77) is connected to the inside of the protective hood (1). A sealing cover plate (78) is installed at one end of the square sleeve (71) away from the protective hood (1), and the air pump (72) is electrically connected to the controller (2).

4. A welding device for repairing an underground coal mining machine according to claim 1, characterized in that: The welding unit (8) comprises an operating port (81) provided on the outer wall of the protective hood (1), and a mounting block (82) is provided on the inner side of the operating port (81), a flexible protective sleeve (83) is fixedly provided between the side wall of the mounting block (82) and the side wall of the operating port (81), a detachable welding gun (84) is installed on the end surface of the mounting block (82), and the welding end of the welding gun (84) is arranged on the inner side of the protective hood (1), and a transparent observation window (85) is provided on the side wall of the protective hood (1) at a position on one side of the operating port (81).

5. The welding device for repairing an underground coal mining machine according to claim 3, characterized in that: The thermal conductivity test unit (9) comprises a pressure ring (91) fixedly arranged on the inner wall of the protective hood (1); the side walls of the two semi-ring steel ferrules (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) close to the semi-convex ring (92), and an annular electric heating strip (94) is provided inside the annular groove (93); an annular heat conducting plate (95) is fixedly installed at the notch of the annular groove (93); the pressure ring (91) is connected to the front end plate of the cutting drum (5) The two semi-convex rings (92) are respectively provided with a plurality of arc grooves (96) at one end close to the pressing ring (91), and an arc heat conductive block (97) is installed at the notch of each arc groove (96), and a temperature detection probe (98) is installed inside each arc groove (96), and the temperature measuring end of each temperature detection probe (98) is in contact with the side wall of the arc heat conductive block (97) on the same side, the two semi-convex rings (92) are pressed against the tail end of the cutting drum (5), and the annular electric heating strip (94) and each temperature detection probe (98) are electrically connected to the controller (2).

6. A welding device for repairing an underground coal mining machine according to claim 5, characterized in that: The ventilation component (10) includes a branch suction pipe (101) fixedly plugged 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) at a side of the air inlet end of the branch suction pipe (101) away from the air pump (72); a ventilation hole (104) is opened on the side wall of the protective hood (1), and a ventilation electric control valve (105) is installed inside the ventilation hole (104); after the controller (2) receives the electrical signal output by at least one temperature detection probe (98), it controls the normally open solenoid valve (103), the normally closed solenoid valve (102) and the ventilation electric control valve (105) to operate.

7. A welding device for repairing an underground coal mining machine according to claim 2, characterized in that: The magnetic attraction fixing component (62) includes an annular non-magnetic plate (621) fixedly mounted on the inner wall of the protective circular cover (1), and a plurality of fixing grooves (622) are provided on the side wall of the annular non-magnetic plate (621) close to the semi-ring steel ferrule (3), and each of the fixing grooves (622) is slidably connected to an arc-shaped non-magnetic plate (623), and the side wall of each arc-shaped non-magnetic plate (623) is fixedly connected to an arc-shaped electromagnetic block (624), and a plurality of springs (625) are fixedly provided between the side wall of the arc-shaped non-magnetic plate (623) and the bottom of the fixing groove (622) on the same side, and the arc-shaped electromagnetic block (624) is electrically connected to the controller (2).

8. A welding device for repairing an underground coal mining machine according to claim 4, characterized in that: A light trough (11) is provided on the inner wall of the protective circular cover (1) at a position on one side of the transparent observation window (85), and a strip light (12) is installed inside the light trough (11), and the strip light (12) is electrically connected to the controller (2).

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