Maintenance device for cover plate of coal mining machine

Abstract

The invention belongs to the technical field of coal mine machinery maintenance equipment, and particularly relates to a coal cutter cover plate maintenance device which comprises a welding main machine, a welding clamp and a welding ground wire, the lower surface of the welding main machine is fixedly connected with an L-shaped rack, and the side wall of the L-shaped rack is fixedly connected with an insulating working table plate; the bottom end of the insulating workbench plate is fixedly connected with a supporting plate. The maintenance device for the cover plate of the coal mining machine not only has the functions of repairing the appearance of the cover plate of the coal mining machine, automatically cleaning and preheating the cracking part of the cover plate and draining welding metal liquid, but also has the functions of adjusting the opening degree of the cracking part of the cover plate and detecting a welding seam after maintenance, so that the maintenance time of the cover plate is shortened, the maintenance convenience and efficiency are improved, and the maintenance cost is reduced. The situation that welding repair convenience and welding seam omission are affected due to too large cracking of the cover plate is avoided, the cover plate which is not maintained to be qualified can be found in time, and the welding maintenance effect and use reliability of the cover plate of the coal mining machine are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine machinery maintenance equipment, and in particular relates to a coal mining machine cover maintenance device. Background Art

[0002] Some key cover plates of coal mining machines, such as the body cover plate and the cutting cover plate, are easily damaged during use. This is because the working environment of the cover plates is harsh, and a large amount of coal dust and rock dust impact the cover plates, causing damage to their surfaces. Secondly, the strong vibration during the coal mining process will loosen the connection parts of the cover plates and cause fatigue cracks. At the same time, under complex geological conditions, the impact force generated by encountering hard obstacles may be transmitted to the cover plates. When damage or even cracks occur, welding equipment is often required for repair to restore its function.

[0003] At present, the welding equipment used to repair cracked and damaged coal mining machine covers has poor functionality and can only perform simple welding operations. This means that when repairing the coal mining machine covers, operations such as cleaning the cracks, correcting deformation, and testing the sealing of welds need to be transferred to other equipment, which makes the repair process of the coal mining machine covers cumbersome and affects the convenience and efficiency of coal mining machine cover repair.

[0004] In addition, when performing welding repairs on thicker coal mining machine covers, due to the large thickness of the weld, the welding metal liquid is often unable to penetrate the weld due to cooling and solidification, resulting in welding omissions in the cracked welds, which in turn affects the effect of the welding repair of the coal mining machine cover, and also affects the reliability of the use of the coal mining machine cover after repair.

[0005] Therefore, we propose a coal mining machine cover maintenance device to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a coal mining machine cover maintenance device in view of the above problems.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a coal mining machine cover maintenance device, comprising a welding main machine, a welding clamp and a welding ground wire, the lower surface of the welding main machine is fixedly connected with an L-shaped frame, the side wall of the L-shaped frame is fixedly connected with an insulating workbench, the bottom end of the insulating workbench is fixedly connected with a support plate, the outer wall of the L-shaped frame and the support plate is fixedly connected with a bottom plate, the upper surface of the bottom plate is fixedly connected with an exhaust mechanism, the top of the L-shaped frame is provided with a through hole, and the hole wall of the through hole is fixedly connected with an electric hydraulic rod, the bottom end of the electric hydraulic rod is fixedly connected with a metal pressing block, and the top of the metal pressing block is electrically connected to the bottom end of the welding ground wire;

[0008] The lower surface of the insulating workbench is fixedly connected with a rolling bearing, the inner wall of the rolling bearing is fixedly connected with a connecting block, the bottom end of the connecting block is fixedly connected with a fixing frame, the inner wall of the fixing frame is fixedly connected with a telescopic rod, and the side end of the telescopic rod is fixedly connected with a connecting rod mechanism;

[0009] The outer wall of the welding tongs is fixedly sleeved with a weld preheating mechanism, the outer wall of the movable end of the telescopic rod is provided with a fixed through hole, and the hole wall of the fixed through hole is fixedly connected with a weld cleaning mechanism, and the upper surface of the L-shaped frame is fixedly connected with a PLC controller.

[0010] In the above-mentioned coal mining machine cover maintenance device, the exhaust mechanism includes a filter box fixedly connected to the upper surface of the base plate, the inner wall of the filter box is fixedly connected with a partition mesh plate, the outer wall of the partition mesh plate is connected with an activated carbon composite filter element plate, a threaded hole is opened at the side end of the filter box, and the hole wall of the threaded hole is threadedly connected with a sealing plug, the inner wall of the sealing plug is fixedly connected with two positioning rods for positioning the activated carbon composite filter element plate, the end of the filter box away from the sealing plug is fixedly connected with a one-way air pump, the air inlet end of the one-way air pump is fixedly connected to the outer wall of the filter box through a bent pipe, the air outlet end of the one-way air pump is fixedly connected with a first hose, the top end of the filter box is fixedly connected with a normally open solenoid valve and a second hose, and the air inlet end of the normally open solenoid valve is fixedly connected with a third hose.

[0011] In the above-mentioned coal mining machine cover maintenance device, the connecting rod mechanism includes a horizontal bar fixedly connected to the side end of the telescopic rod, the upper surface of the side end of the horizontal bar is fixedly connected to a connecting tube, the upper surface of the connecting tube is provided with a rectangular through hole, and the hole wall of the rectangular through hole is movably connected with a square tube, the bottom end of the square tube is fixedly sleeved with a retaining ring, the outer wall of the square tube is provided with a plurality of air holes, the top end of the square tube is fixedly connected with a connecting bar, the side end of the connecting bar is fixedly connected to the outer wall of the welding clamp, the upper surface of the horizontal bar is provided with a mounting hole, and the hole wall of the mounting hole is fixedly connected with a weld detection mechanism.

[0012] In the above-mentioned coal mining machine cover maintenance device, the weld detection mechanism includes an air cylinder fixedly connected to the inner wall of the mounting hole on the horizontal bar, the top hole wall of the air cylinder is movably connected with a knocking rod, the bottom end of the knocking rod is fixedly sleeved with a sealing ring, the rod wall of the knocking rod is movably sleeved with a return spring, the bottom end of the air cylinder is fixedly connected with an intake solenoid valve and an exhaust solenoid valve, the connecting ends of the intake solenoid valve and the exhaust solenoid valve are respectively fixedly connected with an intake pipe and an exhaust pipe, and the intake pipe and the exhaust pipe are both fixedly connected with the pipe wall of the first hose.

[0013] In the above-mentioned coal mining machine cover maintenance device, the weld preheating mechanism includes a fixing ring fixedly sleeved on the outer surface of the welding clamp, the lower surface of the fixing ring is fixedly connected with a bellows, the bottom end of the bellows is fixedly connected with an insulation ring, the inner wall of the insulation ring is fixedly connected with a heat insulation cover, the inner wall of the heat insulation cover is fixedly connected with a metal mesh, a fixed through hole is opened at the side end of the insulation ring, and the hole wall of the fixed through hole is fixedly connected with an electric heating tube in contact with the metal mesh, the air inlet end of the third hose passes through the inner wall of the bellows, the tube wall of the bellows is fixedly connected with an L-shaped tube, the air inlet end of the L-shaped tube is fixedly connected with the air outlet end of the first hose, the bottom end of the L-shaped tube passes through the inner wall of the heat insulation cover, and the inner wall of the bellows is fixedly connected with a smoke sensor.

[0014] In the above-mentioned coal mining machine cover maintenance device, an exhaust metal pipe is fixedly connected to the inner wall of the air outlet of the heat insulation cover, and an L-shaped baffle is fixedly sleeved on the pipe wall of the exhaust metal pipe.

[0015] In the above-mentioned coal mining machine cover maintenance device, the weld cleaning mechanism includes a hollow cylinder movably connected to the inner wall of the fixed through hole at the side end of the telescopic rod, the outer wall of the side end of the telescopic rod is fixedly connected to a fixing frame, the inner wall of the fixing frame is fixedly connected to an electric push rod, the movable end of the electric push rod is fixedly connected to the lower surface of the hollow cylinder, the top end of the hollow cylinder is fixedly connected to a conduit, the top end of the conduit is fixedly sleeved with a sealing cover, the top outer wall of the sealing cover is fixedly connected to a mounting ring, the inner wall of the mounting ring is fixedly connected to a push switch, the inner wall of the hollow cylinder is fixedly connected to an air pressure sensor, the air inlet end of the second hose is fixedly connected to the outer surface of the hollow cylinder, and the top inner wall of the sealing cover is fixedly connected to a conical metal mesh cover.

[0016] In the above-mentioned coal mining machine cover maintenance device, the side end of the metal pressing block is fixedly connected with an L-shaped auxiliary pressing block, and the top end of the L-shaped frame is provided with a through hole matched with the L-shaped auxiliary pressing block.

[0017] Compared with the existing technology, the advantages of a coal mining machine cover maintenance device are:

[0018] 1. By setting up the electric hydraulic rod, metal pressure block and L-shaped auxiliary pressure block, the electric hydraulic rod is used to push the metal pressure block, which can squeeze and repair the bulging and cracked parts of the metal cover of the coal mining machine to restore it to flatness and improve the appearance quality of the cover. When the opening of the cracked cover is large, the metal pressure block is used to drive the L-shaped auxiliary pressure block to reduce the opening of the crack, avoiding the convenience of welding and repair affected by the excessive opening. This mechanism enables the coal mining machine cover maintenance device not only to have the function of appearance repair, but also to adjust the opening degree of the cracked cover, avoiding the situation where the crack of the cover is too large and affects the convenience of welding and repair of the cracked cover.

[0019] 2. Through the set weld preheating mechanism, weld cleaning mechanism and connecting rod mechanism, when the cracked and damaged metal cover of the coal mining machine needs welding repair, first place the coal mining machine cover on the insulating workbench, and push the metal pressure block through the electric hydraulic rod, which can not only limit the cover but also cooperate with welding to form a loop. After the smoke sensor detects the welding smoke, the exhaust mechanism is started, which can purify the smoke generated by welding on the one hand, and automatically clean the gaps at the cracks of the cover by using the negative pressure environment on the other hand. At the same time, the hot air flow preheats the cracks to reduce welding residual stress, prevent deformation cracking and cold cracks, and improve welding quality. The negative pressure state of the hollow cylinder can also guide the flow of welding molten metal to avoid solidification and welding omissions. When the staff controls the movement of the welding clamp, the sealing cover moves synchronously with the welding clamp through the connecting rod mechanism to ensure the continuous coordination of various functions. This mechanism enables the coal mining machine cover maintenance device to have the functions of automatic cleaning, preheating and drainage of welding molten metal at the cracks of the coal mining machine cover, and at the same time can avoid welding omissions in the welds at the cracks of the cover, which not only improves the effect of welding maintenance of the coal mining machine cover, but also ensures the reliability of the use of the coal mining machine cover after maintenance, and can improve the convenience and efficiency of repairing the coal mining machine cover.

[0020] 3. Through the set weld detection mechanism, when the cracks of the coal mining machine cover are welded and repaired, the weld detection mechanism is controlled by the PLC controller, and the knocking rod of the weld detection mechanism knocks multiple times to simulate the external force impact environment, and performs an impact simulation test on the weld to detect the weld quality. On the other hand, a closed cavity is formed by a sealing cover and the air pressure change is detected under a negative pressure state to determine whether the welding is qualified. This mechanism enables the coal mining machine cover maintenance device to have the function of weld detection after maintenance, and enables the device to promptly detect unqualified covers and improve the effect of welding maintenance of the coal mining machine cover. At the same time, it also improves the reliability of the use of the coal mining machine cover after maintenance, further shortens the cover maintenance time, and improves the convenience and efficiency of coal mining machine cover maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a coal mining machine cover maintenance device provided by the present invention;

[0022] Figure 2 It is a structural schematic diagram of an air extraction mechanism in a coal mining machine cover maintenance device provided by the present invention;

[0023] Figure 3 It is a structural schematic diagram of a connecting block part in a coal mining machine cover maintenance device provided by the present invention;

[0024] Figure 4 It is a structural schematic diagram of a weld preheating mechanism in a coal mining machine cover maintenance device provided by the present invention;

[0025] Figure 5It is a structural schematic diagram of a part of a connecting rod mechanism in a coal mining machine cover maintenance device provided by the present invention;

[0026] Figure 6 The present invention is a schematic structural diagram of a weld cleaning mechanism and a weld detection mechanism in a coal mining machine cover maintenance device provided by the present invention.

[0027] In the figure: 1 welding host, 2 welding clamp, 3 welding ground wire, 4 L-shaped frame, 5 exhaust mechanism, 51 filter box, 52 partition mesh plate, 53 activated carbon composite filter plate, 54 sealing plug, 55 positioning rod, 56 one-way exhaust pump, 57 first hose, 58 normally open solenoid valve, 59 second hose, 510 third hose, 6 connecting rod mechanism, 61 horizontal bar, 62 connecting tube, 63 square tube, 64 retaining ring, 65 air hole, 66 connecting strip, 7 weld preheating mechanism, 71 fixing ring, 72 bellows, 73 insulation ring, 74 insulation cover, 75 metal mesh, 76 electric heating tube, 77 L-shaped tube, 78 smoke sensor, 8 weld cleaning mechanism, 81 air Core cylinder, 82 fixing frame, 83 electric push rod, 84 conduit, 85 sealing cover, 86 mounting ring, 87 push switch, 88 air pressure sensor, 89 conical metal mesh cover, 9 weld detection mechanism, 91 air cylinder, 92 knock rod, 93 sealing ring, 94 return spring, 95 air inlet solenoid valve, 96 exhaust solenoid valve, 97 air inlet pipe, 98 air outlet pipe, 10 insulating workbench, 11 support plate, 12 bottom plate, 13 electric hydraulic rod, 14 metal pressure block, 15 rolling bearing, 16 connecting block, 17 fixing frame, 18 telescopic rod, 19 PLC controller, 20 exhaust metal pipe, 21 L-shaped baffle, 22 L-shaped auxiliary pressure block, 23 through hole. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1-Figure 6As shown, a coal mining machine cover maintenance device includes a welding main machine 1, a welding clamp 2 and a welding ground wire 3. The lower surface of the welding main machine 1 is fixedly connected with an L-shaped frame 4, and the side end of the metal pressing block 14 is fixedly connected with an L-shaped auxiliary pressing block 22. The top of the L-shaped frame 4 is provided with a through hole 23 that matches the L-shaped auxiliary pressing block 22. If the crack of the coal mining machine metal cover is large, the coal mining machine cover can also be moved vertically to the L-shaped auxiliary pressing block 22, and the crack of the coal mining machine cover can be adjusted to be arranged at the L-shaped auxiliary pressing block 22. The pressing block 22 is in a vertical position in the extrusion direction, and then the extrusion force of the L-shaped auxiliary pressing block 22 can be used to reduce the opening of the cracked coal mining machine cover, thereby avoiding the situation where the opening of the cracked coal mining machine cover is too large and inconvenient for welding and repair. The side wall of the L-shaped frame 4 is fixedly connected with an insulating workbench 10, and the bottom end of the insulating workbench 10 is fixedly connected with a support plate 11. The outer wall of the L-shaped frame 4 and the support plate 11 is fixedly connected with a bottom plate 12, and the upper surface of the bottom plate 12 is fixedly connected with an exhaust mechanism 5, and the exhaust mechanism 5 includes A filter box 51 is fixedly connected to the upper surface of the bottom plate 12, a partition mesh plate 52 is fixedly connected to the inner wall of the filter box 51, an activated carbon composite filter plate 53 is connected to the outer wall of the partition mesh plate 52, a threaded hole is provided at the side end of the filter box 51, and a sealing plug 54 is threadedly connected to the hole wall of the threaded hole, two positioning rods 55 for positioning the activated carbon composite filter plate 53 are fixedly connected to the inner wall of the sealing plug 54, a one-way air pump 56 is fixedly connected to the end of the filter box 51 away from the sealing plug 54, and the air inlet end of the one-way air pump 56 is connected to the air inlet end of the one-way air pump 56. The one-way vacuum pump 56 is fixedly connected to the outer wall of the filter box 51 through a bent pipe, the air outlet end is fixedly connected to the first hose 57, the top end of the filter box 51 is fixedly connected to the normally open solenoid valve 58 and the second hose 59, the air inlet end of the normally open solenoid valve 58 is fixedly connected to the third hose 510, a through hole is opened at the top end of the L-shaped frame 4, and the hole wall of the through hole is fixedly connected to the electric hydraulic rod 13, the bottom end of the electric hydraulic rod 13 is fixedly connected to the metal pressing block 14, and the top end of the metal pressing block 14 is electrically connected to the bottom end of the welding ground wire 3.

[0030] A rolling bearing 15 is fixedly connected to the lower surface of the insulating workbench 10, and a connecting block 16 is fixedly connected to the inner wall of the rolling bearing 15. A fixed frame 17 is fixedly connected to the bottom end of the connecting block 16, and a telescopic rod 18 is fixedly connected to the inner wall of the fixed frame 17. The side end of the telescopic rod 18 is fixedly connected to a connecting rod mechanism 6, and the connecting rod mechanism 6 includes a horizontal bar 61 fixedly connected to the side end of the telescopic rod 18, and a connecting tube 62 is fixedly connected to the upper surface of the side end of the horizontal bar 61. A rectangular through hole is opened on the upper surface of the connecting tube 62, and a square tube 63 is movably connected to the hole wall of the rectangular through hole. A retaining ring 64 is fixedly sleeved on the bottom end of the square tube 63, and a plurality of air holes 65 are opened on the outer wall of the square tube 63. A connecting strip 66 is fixedly connected to the top end of the square tube 63, and the side end of the connecting strip 66 is fixedly connected to the outer wall of the welding clamp 2.

[0031] A mounting hole is provided on the upper surface of the horizontal bar 61, and a weld detection mechanism 9 is fixedly connected to the hole wall of the mounting hole. The weld detection mechanism 9 includes an air cylinder 91 fixedly connected to the inner wall of the mounting hole on the horizontal bar 61, and a knocking rod 92 is movably connected to the hole wall of the top end of the air cylinder 91. A sealing ring 93 is fixedly sleeved on the bottom end of the knocking rod 92, and a reset spring 94 is movably sleeved on the rod wall of the knocking rod 92. An intake solenoid valve 95 and an exhaust solenoid valve 96 are fixedly connected to the bottom end of the air cylinder 91. The connecting ends of the intake solenoid valve 95 and the exhaust solenoid valve 96 are respectively fixedly connected to an intake pipe 97 and an exhaust pipe 98. The intake pipe 97 and the exhaust pipe 98 are both fixedly connected to the pipe wall of the first hose 57. This mechanism enables the coal mining machine cover maintenance device to have the function of weld detection after maintenance, and enables the device to promptly detect the cover that has failed maintenance, and improve the effect of welding maintenance of the coal mining machine cover.

[0032] The outer wall of the welding clamp 2 is fixedly sleeved with a weld preheating mechanism 7, and the weld preheating mechanism 7 includes a fixing ring 71 fixedly sleeved with the outer surface of the welding clamp 2, a bellows 72 is fixedly connected to the lower surface of the fixing ring 71, a heat insulation ring 73 is fixedly connected to the bottom end of the bellows 72, a heat insulation cover 74 is fixedly connected to the inner wall of the heat insulation ring 73, an exhaust metal pipe 20 is fixedly connected to the inner wall of the air outlet of the heat insulation cover 74, an L-shaped baffle 21 is fixedly sleeved on the pipe wall of the exhaust metal pipe 20, the exhaust metal pipe 20 can constrain a large amount of hot air to blow to the cracks of the coal mining machine cover for efficient preheating, and the L-shaped baffle 21 can prevent the nozzle of the exhaust metal pipe 20 from being blocked, and the heat insulation cover 74 The inner wall is fixedly connected with a metal mesh 75, the side end of the insulation ring 73 is provided with a fixed through hole, and the hole wall of the fixed through hole is fixedly connected with an electric heating tube 76 in contact with the metal mesh 75, the air inlet end of the third hose 510 passes through the inner wall of the bellows 72, the tube wall of the bellows 72 is fixedly connected with an L-shaped tube 77, the air inlet end of the L-shaped tube 77 is fixedly connected with the air outlet end of the first hose 57, the bottom end of the L-shaped tube 77 passes through the inner wall of the insulation cover 74, and the inner wall of the bellows 72 is fixedly connected with a smoke sensor 78. This mechanism enables the coal mining machine cover maintenance device to have the function of preheating the cracks, improves the quality of welding maintenance, and ensures that the coal mining machine cover can be used reliably after maintenance.

[0033] The outer wall of the movable end of the telescopic rod 18 is provided with a fixed through hole, and the hole wall of the fixed through hole is fixedly connected to a weld cleaning mechanism 8, the upper surface of the L-shaped frame 4 is fixedly connected to a PLC controller 19, the weld cleaning mechanism 8 includes a hollow cylinder 81 movably connected to the inner wall of the fixed through hole at the side end of the telescopic rod 18, the outer wall of the side end of the telescopic rod 18 is fixedly connected to a fixed frame 82, the inner wall of the fixed frame 82 is fixedly connected to an electric push rod 83, the movable end of the electric push rod 83 is fixedly connected to the lower surface of the hollow cylinder 81, the top of the hollow cylinder 81 is fixedly connected to a guide tube 84, the guide tube A sealing cover 85 is fixedly sleeved on the top of the tube 84, a mounting ring 86 is fixedly connected to the top outer wall of the sealing cover 85, a push switch 87 is fixedly connected to the inner wall of the mounting ring 86, an air pressure sensor 88 is fixedly connected to the inner wall of the hollow tube 81, an air inlet end of the second hose 59 is fixedly connected to the outer surface of the hollow tube 81, a conical metal mesh cover 89 is fixedly connected to the top inner wall of the sealing cover 85. This mechanism enables the coal mining machine cover maintenance device to have the function of automatic cleaning of cracks, shortens the coal mining machine cover maintenance process, and improves the convenience and efficiency of coal mining machine cover maintenance.

[0034] The welding host 1, the one-way vacuum pump 56, the normally open solenoid valve 58, the electric heating tube 76, the electric push rod 83, the air intake solenoid valve 95, the exhaust solenoid valve 96 and the electric hydraulic rod 13 are all electrically connected to the output end of the PLC controller 19 through wires, the smoke sensor 78 and the air pressure sensor 88 are electrically connected to the input end of the PLC controller 19 through wires, the push switch 87 is electrically connected to the external power supply through a wire, and the push switch 87 is electrically connected to the input end of the PLC controller 19 through a wire. The above-mentioned power-on devices and electrical connections are all existing technologies and will not be repeated here.

[0035] The operating principle of the present invention is described as follows: when the metal cover of the coal mining machine needs to be repaired due to deformation or cracking, the damaged part of the metal cover of the coal mining machine is first moved to the bottom of the metal pressing block 14, and then the PLC controller 19 controls the electric hydraulic rod 13 to push the metal pressing block 14 downward and squeeze the damaged part of the metal cover of the coal mining machine to repair it. For example, the bulging part of the metal cover of the coal mining machine is squeezed and flattened by the metal pressing block 14, or the cracked and raised part of the metal cover of the coal mining machine can also be squeezed and flattened by the downwardly moved metal pressing block 14. In addition, if the cracked opening of the metal cover of the coal mining machine is large, the coal mining machine cover can also be moved vertically to the L-shaped auxiliary pressing block 22. At the same time, the cracked part of the coal mining machine cover is adjusted to be arranged in a vertical position with respect to the extrusion direction of the L-shaped auxiliary pressure block 22. Then, when the PLC controller 19 controls the electric hydraulic rod 13 to push the metal pressure block 14 downward, the metal pressure block 14 drives the L-shaped auxiliary pressure block 22 to move downward. After that, the extrusion force of the L-shaped auxiliary pressure block 22 can be used to reduce the opening of the cracked part of the coal mining machine cover, thereby avoiding the situation that the opening of the cracked part of the coal mining machine cover is too large and inconvenient for welding and repair. This mechanism enables the coal mining machine cover repair device not only to have the function of repairing the appearance, but also to adjust the opening degree of the cracked part of the cover, thereby avoiding the situation that the cracked part of the cover is too large and affects the convenience of welding and repair of the cracked part of the cover.

[0036] When the cracked and damaged metal cover of the coal mining machine needs welding repair, first place the coal mining machine cover on the insulating workbench 10, and rotate the cracked part of the coal mining machine cover to suspend it outside the insulating workbench 10, then the PLC controller 19 controls the welding host 1 and the electric hydraulic rod 13 to start, the electric hydraulic rod 13 pushes the metal pressure block 14 to squeeze the limited coal mining machine cover, and the metal pressure block 14 connected to the welding ground wire 3 can cooperate with the welding clamp 2 and the welding host 1 to form a welding circuit, to ensure that the cracked part of the coal mining machine cover can be reliably welded and repaired, then the staff clamps the welding rod on the welding clamp 2, and controls the welding rod to weld the cracked part of the coal mining machine cover through the welding clamp 2, and the smoke generated by the welding of the welding rod The fog is detected by the smoke sensor 78, and the smoke sensor 78 sends an electrical signal to the PLC controller 19. The PLC controller 19 controls the one-way air pump 56 of the air extraction mechanism 5 to be powered on and started, and also controls the electric heating tube 76 and the electric push rod 83 to work. The electric heating tube 76 is powered on to generate heat, so that the temperature in the heat insulation cover 74 is increased. The electric push rod 83 is controlled by the PLC controller 19 to push the hollow cylinder 81 upward, and makes the top of the sealing cover 85 contact the lower surface of the coal mining machine cover. Then, after the top of the sealing cover 85 contacts the coal mining machine cover, the press switch 87 is also pressed by the coal mining machine cover and powered on, and the circuit sends an electrical signal to the PLC controller 19, and the PLC controller 19 controls the electric push rod 83 to stop extending;

[0037] During this process, the one-way air pump 56 sucks the air in the bellows 72 and the hollow cylinder 81 respectively through the filter box 51, the normally open solenoid valve 58, the second hose 59 and the third hose 510. After the air is sucked out of the bellows 72 by the third hose 510, the air can carry the smoke constrained by the bellows 72 into the filter box 51, and the small smoke particles are intercepted and purified by the activated carbon composite filter element plate 53. After the air is sucked out of the hollow cylinder 81 by the second hose 59, a negative pressure environment is formed at the sealing cover 85 and the hollow cylinder 81. The negative pressure environment requires the suction of external air for pressure balance, but the top of the sealing cover 85 contacts the surface of the coal mining machine cover, which will hinder the suction of external air. Therefore, the negative pressure sealing cover 85 is sucked through the cracks in the coal mining machine cover. The air is pressure balanced, and then when the airflow passes through the cracks of the coal mining machine cover, it can peel off the coal powder impurities attached to the surface of the cracks, and the airflow is used to automatically clean the cracks of the coal mining machine cover. In addition, the clean air discharged by the one-way air pump 56 is transported to the L-shaped tube 77 through the first hose 57. The air in the L-shaped tube 77 passes through the heat insulation cover 74 and is heated by the high-temperature electric heating tube 76 and the metal mesh 75. The air with increased temperature is sprayed through the exhaust metal pipe 20 to the cracks of the coal mining machine cover that have not flowed into the welding metal liquid. The hot air flow can preheat the cracks of the coal mining machine cover. After the cracks of the coal mining machine cover are preheated, the residual stress of welding can be reduced, deformation and cracking caused by thermal expansion and contraction can be prevented, and cold cracks can be prevented. This can improve the performance of the welding joint and improve the welding quality. In addition, while the hollow cylinder 81 continuously draws air through the second hose 59, the negative pressure state in the sealing cover 85 also continues. The negative pressure suction force generated by the negative pressure environment can also guide the welding molten metal flowing into the cracks of the coal mining machine cover to flow downward. Especially when facing thicker coal mining machine covers, it can ensure that the welding molten metal can pass through the cracks of the cover. Moreover, since the cracks of the coal mining machine cover are preheated before welding, the preheating temperature further avoids the situation where the welding molten metal flowing into the cracks of the coal mining machine cover solidifies due to rapid cooling, so that the welding molten metal can be completely filled into the cracks of the coal mining machine cover, avoiding welding omissions at the cracks of the coal mining machine cover, and the staff When the welding clamp 2 is controlled to move, the welding clamp 2 drives the telescopic rod 18 to move in the same distance and direction through the connecting bar 66, the square tube 63 and the cross bar 61, and the side end of the telescopic rod 18 can drive the hollow cylinder 81 and the sealing cover 85 to move synchronously with the moving direction and distance of the welding clamp 2, ensuring that the weld preheating mechanism 7 and the weld cleaning mechanism 8 can continuously cooperate with each other. This mechanism enables the coal mining machine cover maintenance device to have the functions of automatic cleaning, preheating and welding metal liquid drainage of the cracked parts of the coal mining machine cover, and at the same time can avoid the situation of welding omissions in the welds at the cracked parts of the cover, which not only improves the effect of the welding maintenance of the coal mining machine cover, but also ensures the reliability of the use of the coal mining machine cover after maintenance, and can improve the convenience and efficiency of repairing the coal mining machine cover.

[0038] When the cracks in the coal mining machine cover are welded and repaired, the PLC controller 19 controls the welding host 1 to stop welding. At the same time, the PLC controller 19 also controls the moving end of the electric push rod 83 to retract, and the PLC controller 19 also controls the normally open solenoid valve 58 to be energized and closed, and the one-way air pump 56 continues to be energized to pump air. When the sucked air is discharged through the first hose 57, the PLC controller 19 controls the air intake solenoid valve 95 to be energized and opened. Part of the air in the first hose 57 quickly enters the air cylinder 91, and pushes the knocking rod 92 through the sealing ring 93 to quickly impact the weld of the coal mining machine cover, and simulates the environment in which the coal mining machine cover is impacted by external force again by knocking. After the impact simulation is completed, The air inlet solenoid valve 95 is powered off and closed, and the exhaust solenoid valve 96 is powered on and opened. At this time, the return spring 94 compressed in the air cylinder 91 is restored, and the elastic force of the recovery process pushes the knocking rod 92 to retract. During the retraction process, the air in the gas returns to the first hose 57 through the exhaust solenoid valve 96 and the outlet pipe 98. Then, the PLC controller 19 cyclically controls the opening and closing of the air inlet solenoid valve 95 and the exhaust solenoid valve 96, and controls the knocking rod 92 to knock on the crack repair area of ​​the coal mining machine cover for multiple times. After that, the position of the sealing cover 85 is randomly controlled by the welding clamp 2 and the connecting rod mechanism 6, and the moving end of the electric push rod 83 is extended by the PLC controller 19, and the electric push rod 83 pushes the sealing cover 85 to contact the coal mining machine cover welding again. The area to be repaired, at this time, the sealing cover 85 is close to the surface of the coal mining machine cover, and a closed cavity is formed inside the sealing cover 85, and then under the suction action of the one-way vacuum pump 56, the sealing cover 85 is in a negative pressure state again, when the air pressure in the sealing cover 85 is fed back to the PLC controller 19 in real time through the air pressure sensor 88, and when the air pressure value detected by the air pressure sensor 88 reaches the air pressure threshold preset by the PLC controller 19, the PLC controller 19 controls the one-way vacuum pump 56 to cut off the power and stop ventilation, and observe for 1 minute. If the air pressure sensor 88 detects that there is no change in the air pressure in the sealing cover 85 within 1 minute, it means that the welding of the coal mining machine cover welding maintenance area located on the top of the sealing cover 85 is qualified , especially after the knocking rod 92 has been knocked for many times, it still has a sealing effect. On the contrary, if the air pressure sensor 88 detects that the air pressure at the sealing cover 85 has changed, it means that there is a leak at the welding point of the coal mining machine cover, indicating that the welding repair of the coal mining machine cover is unqualified and needs to be repaired again. In this way, the sealing cover 85 is checked several times to improve the accuracy of the weld detection result. This mechanism enables the coal mining machine cover maintenance device to have the function of weld detection after maintenance, and enables the device to promptly detect the cover that has failed the maintenance, as well as improve the effect of the coal mining machine cover welding maintenance, and at the same time improves the reliability of the use of the coal mining machine cover after maintenance, further shortens the time for cover maintenance, and improves the convenience and efficiency of coal mining machine cover maintenance.

[0039] 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 coal mining machine cover maintenance device, comprising a welding main machine (1), a welding clamp (2) and a welding ground wire (3), characterized in that: The lower surface of the welding main machine (1) is fixedly connected to an L-shaped frame (4), the side wall of the L-shaped frame (4) is fixedly connected to an insulating workbench (10), the bottom end of the insulating workbench (10) is fixedly connected to a support plate (11), the outer wall of the L-shaped frame (4) and the support plate (11) is fixedly connected to a bottom plate (12), the upper surface of the bottom plate (12) is fixedly connected to an exhaust mechanism (5), the top of the L-shaped frame (4) is provided with a through hole, and the hole wall of the through hole is fixedly connected to an electric hydraulic rod (13), the bottom end of the electric hydraulic rod (13) is fixedly connected to a metal pressing block (14), and the top end of the metal pressing block (14) is electrically connected to the bottom end of the welding ground wire (3); The lower surface of the insulating workbench (10) is fixedly connected to a rolling bearing (15), the inner wall of the rolling bearing (15) is fixedly connected to a connecting block (16), the bottom end of the connecting block (16) is fixedly connected to a fixing frame (17), the inner wall of the fixing frame (17) is fixedly connected to a telescopic rod (18), and the side end of the telescopic rod (18) is fixedly connected to a connecting rod mechanism (6); A weld preheating mechanism (7) is fixedly sleeved on the outer wall of the welding clamp (2), a fixed through hole is opened on the outer wall of the movable end of the telescopic rod (18), and a weld cleaning mechanism (8) is fixedly connected to the hole wall of the fixed through hole, and a PLC controller (19) is fixedly connected to the upper surface of the L-shaped frame (4).

2. A coal mining machine cover repair device according to claim 1, characterized in that: The air extraction mechanism (5) comprises a filter box (51) fixedly connected to the upper surface of the bottom plate (12); a partition screen (52) is fixedly connected to the inner wall of the filter box (51); an activated carbon composite filter plate (53) is connected to the outer wall of the partition screen (52); a threaded hole is provided at the side end of the filter box (51); a sealing plug (54) is threadedly connected to the hole wall of the threaded hole; two positioning rods (54) for positioning the activated carbon composite filter plate (53) are fixedly connected to the inner wall of the sealing plug (54); 5), one end of the filter box (51) away from the sealing plug (54) is fixedly connected to a one-way air pump (56), the air inlet end of the one-way air pump (56) is fixedly connected to the outer wall of the filter box (51) through a bent pipe, the air outlet end of the one-way air pump (56) is fixedly connected to a first hose (57), the top end of the filter box (51) is fixedly connected to a normally open solenoid valve (58) and a second hose (59), and the air inlet end of the normally open solenoid valve (58) is fixedly connected to a third hose (510).

3. A coal mining machine cover repair device according to claim 1, characterized in that: The connecting rod mechanism (6) comprises a horizontal bar (61) fixedly connected to the side end of the telescopic rod (18); a connecting tube (62) is fixedly connected to the upper surface of the side end of the horizontal bar (61); a rectangular through hole is provided on the upper surface of the connecting tube (62); a square tube (63) is movably connected to the hole wall of the rectangular through hole; a retaining ring (64) is fixedly sleeved on the bottom end of the square tube (63); a plurality of air holes (65) are provided on the outer wall of the square tube (63); a connecting bar (66) is fixedly connected to the top end of the square tube (63); a side end of the connecting bar (66) is fixedly connected to the outer wall of the welding clamp (2); a mounting hole is provided on the upper surface of the horizontal bar (61); a weld detection mechanism (9) is fixedly connected to the hole wall of the mounting hole.

4. A coal mining machine cover repair device according to claim 3, characterized in that: The weld detection mechanism (9) comprises an air cylinder (91) fixedly connected to the inner wall of the mounting hole on the horizontal bar (61); a knocking rod (92) is movably connected to the top hole wall of the air cylinder (91); a sealing ring (93) is fixedly sleeved on the bottom end of the knocking rod (92); a return spring (94) is movably sleeved on the rod wall of the knocking rod (92); an air intake solenoid valve (95) and an air exhaust solenoid valve (96) are fixedly connected to the bottom end of the air cylinder (91); the connecting ends of the air intake solenoid valve (95) and the air exhaust solenoid valve (96) are respectively fixedly connected to an air intake pipe (97) and an air outlet pipe (98); the air intake pipe (97) and the air outlet pipe (98) are both fixedly connected to the pipe wall of the first hose (57).

5. A coal mining machine cover repair device according to claim 2, characterized in that: The weld preheating mechanism (7) comprises a fixing ring (71) fixedly sleeved on the outer surface of the welding clamp (2); the lower surface of the fixing ring (71) is fixedly connected to a bellows (72); the bottom end of the bellows (72) is fixedly connected to a heat insulating ring (73); the inner wall of the heat insulating ring (73) is fixedly connected to a heat insulating cover (74); the inner wall of the heat insulating cover (74) is fixedly connected to a metal mesh (75); a fixed through hole is opened at the side end of the heat insulating ring (73); An electric heating tube (76) in contact with the metal mesh (75) is fixedly connected to the hole wall, an air inlet end of the third hose (510) passes through the inner wall of the bellows (72), an L-shaped tube (77) is fixedly connected to the tube wall of the bellows (72), an air inlet end of the L-shaped tube (77) is fixedly connected to the air outlet end of the first hose (57), a bottom end of the L-shaped tube (77) passes through the inner wall of the heat insulation cover (74), and a smoke sensor (78) is fixedly connected to the inner wall of the bellows (72).

6. A coal mining machine cover repair device according to claim 5, characterized in that: An exhaust metal pipe (20) is fixedly connected to the inner wall of the air outlet of the heat insulation cover (74), and an L-shaped baffle (21) is fixedly sleeved on the pipe wall of the exhaust metal pipe (20).

7. A coal mining machine cover repair device according to claim 2, characterized in that: The weld cleaning mechanism (8) comprises a hollow cylinder (81) movably connected to the inner wall of a fixed through hole at the side end of a telescopic rod (18); a fixing frame (82) is fixedly connected to the outer wall of the side end of the telescopic rod (18); an electric push rod (83) is fixedly connected to the inner wall of the fixing frame (82); a movable end of the electric push rod (83) is fixedly connected to the lower surface of the hollow cylinder (81); a top end of the hollow cylinder (81) is fixedly connected to a conduit (84); and the conduit (84) is ) is fixedly sleeved at the top end thereof with a sealing cover (85), the top outer wall of the sealing cover (85) is fixedly connected to a mounting ring (86), the inner wall of the mounting ring (86) is fixedly connected to a push switch (87), the inner wall of the hollow cylinder (81) is fixedly connected to an air pressure sensor (88), the air inlet end of the second hose (59) is fixedly connected to the outer surface of the hollow cylinder (81), and the top inner wall of the sealing cover (85) is fixedly connected to a conical metal mesh cover (89).

8. A coal mining machine cover repair device according to claim 1, characterized in that: An L-shaped auxiliary pressing block (22) is fixedly connected to the side end of the metal pressing block (14), and a through hole (23) matching with the L-shaped auxiliary pressing block (22) is provided at the top end of the L-shaped frame (4).

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