A welding auxiliary device for the end disc of a coal mining machine spiral drum

Abstract

This invention relates to the field of welding auxiliary technology, and particularly to a welding auxiliary device for the end plate of a coal mining machine spiral drum. The device includes a worktable, an end plate fixing mechanism mounted on the worktable, and a heat insulation mechanism mounted on the end plate fixing mechanism. The heat insulation mechanism includes a mounting ring, two connecting frames symmetrically mounted on the upper end of the mounting ring, a heat insulation cover mounted on the end of the connecting frames away from the mounting ring, and a sealing assembly for intermittently sealing the front and rear ends of the heat insulation cover. The heat insulation cover and sealing assembly cooperate with the side wall of the end plate to form a heat insulation and protective structure during the welding of the gear seat. This invention significantly improves the timeliness and ease of operation of heat insulation through synchronous welding and heat insulation execution, automated sealing control, fixed heat insulation linkage operation, and a structural design adapted to the end plate, ensuring welding quality and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of welding auxiliary technology, and in particular to a welding auxiliary device for the end plate of a coal mining machine spiral drum. Background Technology

[0002] The spiral drum is the core working mechanism of a coal mining machine, consisting of spiral blades, end plates, and toothed seats, and has the dual functions of coal wall cutting and coal loading. The end plates and toothed seats are mostly rigidly connected by welding. During welding, the toothed seats are first fixed to the end plates, and the toothed seats are initially welded by spot welding. Then, the toothed seats and end plates are fully welded by segmented welding.

[0003] After welding, in order to control residual welding stress, prevent cold cracking, and improve the microstructure and properties of the welded joint, it is necessary to keep the welded area warm so that the weld and heat-affected zone remain at a higher temperature for a longer period of time, which promotes hydrogen escape, reduces hardening tendency, and reduces thermal stress.

[0004] Currently, insulation is often achieved by covering the weld seam with insulation blankets or using heating devices such as ceramic heating pads, tracked heaters, and flame heaters to locally heat the weld seam and heat-affected zone. However, since there are many tooth seats to be welded on the end plate, by the time the above insulation methods are applied after the overall welding is completed, some heat has already been lost, resulting in poor insulation effect. In addition, covering with insulation blankets requires manual labor, which is time-consuming, while using heating devices can only heat and insulate localized areas, and the operating space is limited, making it difficult to meet the insulation requirements of end plates with large overall dimensions. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a welding auxiliary device for the end plate of a coal mining machine spiral drum, which heats and keeps the welding position in a timely manner during the welding process, thereby assisting in the high efficiency and high quality of the welding process.

[0006] A welding auxiliary device for the end plate of a coal mining machine spiral drum includes a workbench, an end plate fixing mechanism installed on the workbench, and a heat preservation mechanism installed on the end plate fixing mechanism.

[0007] The end plate fixing mechanism includes a fixed cylinder fixedly installed in the middle of the workbench, multiple clamping components evenly arranged circumferentially on the side wall of the fixed cylinder for internal support and fixing of the end plate, and a driving component for driving the multiple clamping components to slide synchronously along the radial direction of the fixed cylinder.

[0008] The insulation mechanism includes a mounting ring that is detachably and slidably connected to the upper end of the fixed cylinder, two connecting frames symmetrically mounted on the upper end of the mounting ring, an insulation cover mounted on the end of the connecting frame away from the mounting ring, and a sealing component for intermittently sealing the front and rear ends of the insulation cover. The insulation cover, the sealing component and the end plate side wall cooperate to form an insulation and protection structure during the welding process of the tooth seat.

[0009] Preferably, the clamping assembly includes a sliding rod that is slidably connected to the fixed cylinder in the radial direction. A clamping plate is fixedly installed at one end of the sliding rod outside the fixed cylinder. The clamping plate has an arc surface structure and a flange for limiting the upper end of the end plate is provided at the upper end of the clamping plate.

[0010] Preferably, the driving assembly includes a driving disk, and multiple guide rods for guiding the driving disk are installed between the upper and lower inner walls of the fixed cylinder. The driving disk is slidably installed between the multiple guide rods and has an inverted frustum-shaped structure. A mating block is installed at one end of the clamping assembly inside the fixed cylinder. The side of the mating block near the driving disk has an inclined structure that fits against the side wall of the driving disk. A screw is rotatably installed on the upper end of the driving disk. The screw is threadedly connected to the fixed cylinder, and the upper end of the screw is located outside the fixed cylinder.

[0011] Preferably, the lower end of the mounting ring is located inside the fixed cylinder, and an annular guide groove is provided on the inner surface of the lower end of the mounting ring; the upper inner wall of the fixed cylinder is symmetrically provided with plug-in blocks that slide radially along it, and a return spring is connected between the plug-in blocks and the fixed cylinder, and the end of the plug-in block is plugged into the guide groove.

[0012] Preferably, the drive assembly further includes sliding rods that are slidably mounted on the upper end of the drive disk and correspond one-to-one with the plug-in blocks. The upper end of the sliding rod slides through the upper end face of the fixed cylinder and is fixedly mounted with a pressure block. The middle part of the sliding rod is slidably connected to an extension plate fixedly mounted on the side wall of the plug-in block. The upper end face of the fixed cylinder is symmetrically mounted with push blocks that correspond one-to-one with the pressure blocks. The upper end face of the pressure block and the lower end face of the push block have a mutually fitting inclined structure.

[0013] Preferably, the heat insulation cover has an arc-shaped structure and an inverted L-shaped cross-section, with a sealing ring snapped into the lower ends of the left and right heat insulation covers.

[0014] Preferably, the upper end of the worktable is provided with an annular groove for the rotation of the closed ring, a limiting rod is installed on the outer ring wall of the annular groove and is slidably connected to the outer ring wall of the closed ring, a ball bearing is rotatably installed on the inner ring wall of the closed ring and contacts the inner ring wall of the annular groove, and a ball bearing is also rotatably installed on the upper end of the annular groove.

[0015] Preferably, the sealing assembly includes a sealing plate that is elastically and horizontally slidably installed at the end of the heat insulation cover and a pushing member for driving the sealing plate to slide. The sealing plate is an elastic and telescopic structure, and the end of the telescopic section of the sealing plate away from the fixed section of the sealing plate is arc-shaped.

[0016] Preferably, the pushing components are evenly distributed on the worktable along the circumference of the fixed cylinder. The pushing components include a first pushing column and a second pushing column fixedly installed on the worktable. The sealing plate fixing section penetrates the side wall of the heat insulation cover and is fixedly installed with inclined guide plates. There are a total of four inclined guide plates on the two heat insulation covers. The four inclined guide plates are divided into front and rear groups, and the front and rear groups of inclined guide plates are centrally symmetrically distributed.

[0017] Preferably, in the two inclined guide plates in the same group, one inclined guide plate is located at the upper part of the sealing plate fixing section, and the other inclined guide plate is located at the lower part of the sealing plate fixing section. Correspondingly, the No. 1 pushing column and the No. 2 pushing column are distributed alternately vertically.

[0018] As can be seen from the above technical solutions, the auxiliary device for welding the end plate of the spiral drum of the coal mining machine designed in this invention has the following beneficial effects: 1. Through the coordinated design of the insulation mechanism and the end plate fixing mechanism, this invention forms a closed insulation space in real time during the welding of the tooth seat. The insulation cover and the sealing component automatically fit against the side wall of the end plate and cooperate with the worktable to form an insulation and protection structure around the weld, ensuring that the welding part is insulated in time and assisting the welding equipment to improve the welding quality.

[0019] 2. This invention achieves the function of locking the clamping and heat preservation mechanisms simultaneously with a single operation through a drive component. The clamping of the end plate and the locking of the heat preservation mechanism can be achieved at the same time with one action, reducing operation steps, improving the overall efficiency of the device, and meeting the requirements of high-efficiency welding.

[0020] In summary, this invention significantly improves the timeliness and ease of operation of heat preservation by simultaneously performing welding and heat preservation, automatically controlling sealing, linking fixing and heat preservation operations, and using a structural design that adapts to the end plate, thus ensuring welding quality and increasing production efficiency. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a forward structural diagram of the present invention.

[0024] Figure 3 This is a top view of the structure of the present invention.

[0025] Figure 4 This is a frontal sectional view of a partial structure of the present invention.

[0026] Figure 5 This is the present invention. Figure 4 Enlarged view of point A in the middle.

[0027] Figure 6 This is the present invention. Figure 4 Enlarged view of point B in the middle.

[0028] Figure 7 This is a three-dimensional structural diagram of the present invention from another perspective.

[0029] Figure 8 This is a bottom view of the fixed cylinder and U-shaped component of the present invention.

[0030] Reference numerals: 1. Workbench; 11. Limiting rod; 2. End plate fixing mechanism; 3. Insulation mechanism; 21. Fixing cylinder; 211. U-shaped part; 22. Clamping assembly; 221. Sliding rod; 222. Clamping plate; 23. Drive assembly; 231. Drive plate; 232. Guide rod; 233. Mating block; 234. Screw; 235. Sliding rod; 236. Pressure block; 237. Pushing block; 24. Insertion block; 31. Mounting ring; 32. Connecting frame; 33. Insulation cover; 331. Locking block; 34. Sealing assembly; 341. Sealing plate; 342. Pushing part; 343. Pushing column No. 1; 344. Pushing column No. 2; 345. Inclined guide plate; 35. Closing ring; 36. Closing cover. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Reference Figure 1 A welding auxiliary device for the end plate of a coal mining machine spiral drum includes a workbench 1, an end plate fixing mechanism 2 installed on the workbench 1, and a heat preservation mechanism 3 installed on the end plate fixing mechanism 2.

[0033] Reference Figure 1 and Figure 4 The end plate fixing mechanism 2 includes a fixed cylinder 21 fixedly installed in the middle of the workbench 1, a plurality of clamping components 22 uniformly arranged circumferentially on the side wall of the fixed cylinder 21 for internal support and fixing of the end plate, and a driving component 23 for driving the plurality of clamping components 22 to slide synchronously along the radial direction of the fixed cylinder 21.

[0034] Reference Figure 1 and Figure 3The heat preservation mechanism 3 includes an installation ring 31 that is detachably and slidably connected to the upper end of the fixed cylinder 21, two connecting frames 32 that are symmetrically installed on the upper end of the installation ring 31, a heat preservation cover 33 installed on the end of the connecting frame 32 away from the installation ring 31, and a sealing component 34 for intermittently sealing the front and rear ends of the heat preservation cover 33. The heat preservation cover 33 and the sealing component 34 cooperate with the side wall of the end plate to form a heat preservation and protection structure during the welding process of the tooth seat.

[0035] More specifically, such as Figure 8 As shown, the upper end face of the fixed cylinder 21 is composed of two parts: an annular plate and a circular plate. The circular plate is located inside the annular plate and is coaxially arranged with the annular plate. An annular rotation groove is left between the circular plate and the annular plate for the mounting ring 31 to rotate. The lower ends of the circular plate and the annular plate are fixedly connected by multiple U-shaped pieces 211. The space left between the two vertical sections of the U-shaped piece 211 is sufficient for the mounting ring 31 to rotate, that is, the U-shaped piece 211 will not obstruct the rotation of the mounting ring 31.

[0036] Reference Figure 4 The clamping assembly 22 includes a sliding rod 221 that is slidably connected to the fixed cylinder 21 in the radial direction. A clamping plate 222 is fixedly installed at one end of the sliding rod 221 outside the fixed cylinder 21. The clamping plate 222 has an arc surface structure and a flange for limiting the upper end of the end plate is provided at the upper end of the clamping plate 222.

[0037] Reference Figure 4 The driving assembly 23 includes a driving disk 231. Multiple guide rods 232 for guiding the driving disk 231 are installed between the upper and lower inner walls of the fixed cylinder 21. The driving disk 231 is slidably installed between the multiple guide rods 232. The driving disk 231 is an inverted frustum-shaped structure. A mating block 233 is installed at one end of the clamping assembly 22 inside the fixed cylinder 21. The side of the mating block 233 near the driving disk 231 is an inclined structure that fits against the side wall of the driving disk 231. A screw 234 is rotatably installed on the upper end of the driving disk 231. The screw 234 is threadedly connected to the fixed cylinder 21, and the upper end of the screw 234 is located outside the fixed cylinder 21.

[0038] Before welding, place the end plate on the workbench 1, so that the end plate is located outside the fixed cylinder 21 and is in a position approximately coaxial with the fixed cylinder 21. Then, manually rotate the screw 234, so that the screw 234 drives the drive plate 231 to move downward along the guide rod 232. The downward movement of the drive plate 231 drives multiple mating blocks 233 to move in a direction away from each other, thereby causing the drive rod to drive the corresponding clamping plate 222 to provide circumferential support to the inner wall of the end plate, achieving a fixing effect. At the same time, the flange at the upper end of the clamping plate 222 cooperates with the upper surface of the workbench 1 to limit the vertical position of the end plate, further improving the stability of the end plate position during welding.

[0039] Reference Figure 4 and Figure 5 The lower end of the mounting ring 31 is located inside the fixed cylinder 21, and an annular guide groove is provided on the inner surface of the lower end of the mounting ring 31. The upper inner wall of the fixed cylinder 21 is symmetrically provided with insertion blocks 24 that slide radially along it. A return spring is connected between the insertion block 24 and the fixed cylinder 21. The end of the insertion block 24 is inserted into the guide groove. Through the insertion and cooperation between the guide groove and the insertion block 24, the stability of the mounting ring 31 during rotation is improved, and the mounting ring 31 is prevented from separating from the fixed cylinder 21 during the welding process, which would affect the heat preservation and protection effect.

[0040] Reference Figure 4 and Figure 5 The drive assembly 23 further includes sliding rods 235, corresponding to the plug-in blocks 24, which are slidably mounted on the upper end of the drive disk 231. The upper end of the sliding rod 235 slides through the upper surface of the fixed cylinder 21 and is fixedly mounted with a pressure block 236. The middle part of the sliding rod 235 is slidably connected to an extension plate fixedly mounted on the side wall of the plug-in block 24. The upper surface of the fixed cylinder 21 is symmetrically mounted with push blocks 237, corresponding to the pressure blocks 236. The upper surface of the pressure block 236 and the lower surface of the push block 237 are inclined surfaces that fit together. The push block 237 is covered with a protective cover fixedly mounted on the upper end of the fixed cylinder 21.

[0041] Before welding, the mounting ring 31 is inserted and the position of the clamping assembly 22 is adjusted by rotating the screw 234 and driving the drive disk 231. At the same time, the drive disk 231 drives the sliding rod 235 to move downward synchronously. During the downward movement, the pressure block 236 moves downward along the inclined surface of the push block 237, the extension plate pushes the plug block 24, and at the same time pushes and pulls the reset spring. The plug block 24 is inserted into the guide groove to guide and limit the rotation of the mounting ring 31 during the welding process.

[0042] After welding, the screw 234 is rotated in the opposite direction, causing the screw 234 to drive the drive plate 231 to move upward. After moving upward, the pressure block 236 moves upward along the inclined surface of the push block 237. Under the reset action of the reset spring, the sliding rod 235 drives the plug block 24 to gradually move out of the guide groove. When the clamping assembly 22 releases the clamping and fixing of the end plate, the plug block 24 is also completely moved out of the guide groove. At this time, the mounting ring 31 and the heat insulation cover 33 can be removed from the fixing cylinder 21 to avoid obstructing the removal of the end plate with the welded upper tooth seat.

[0043] Reference Figure 3 , Figure 4 and Figure 6The heat insulation cover 33 has an arc-shaped structure and an inverted L-shaped cross-section. The lower ends of the two heat insulation covers 33 are connected to a sealing ring 35. Specifically, the lower end of the heat insulation cover 33 is integrally formed with multiple locking blocks 331. The upper end of the sealing ring 35 has a locking groove corresponding to each locking block 331. The sealing ring 35 is slidably connected to the worktable 1. Before welding, the locking blocks 331 are inserted into the locking grooves to achieve the connection between the heat insulation cover 33 and the sealing ring 35, so that the sealing ring 35 can rotate synchronously with the heat insulation cover 33. In this way, the lower end of the heat insulation cover 33 can be sealed by the sealing ring 35 during the welding process to provide a more enclosed heat insulation space, slow down the heat dissipation rate of the welding part, and improve the heat insulation effect. After welding, the heat insulation cover 33 is lifted up to separate the locking blocks 331 from the locking grooves.

[0044] Furthermore, refer to Figure 4 and Figure 6 The upper end of the workbench 1 is provided with an annular groove for the rotation of the closed ring 35. A limiting rod 11 is installed on the outer ring wall of the annular groove and is slidably connected to the outer ring wall of the closed ring 35. The limiting rod 11 prevents the closed ring 35 from falling out of the annular groove. A ball bearing is rotatably installed on the inner ring wall of the closed ring 35 and contacts the inner ring wall of the annular groove. A ball bearing is also rotatably installed on the upper end of the annular groove to reduce the wear generated during the rotation of the closed ring 35.

[0045] Reference Figure 1 and Figure 7 The sealing assembly 34 includes a sealing plate 341 that is elastically and horizontally slidably mounted at the end of the heat insulation cover 33, and a pushing member 342 for driving the sealing plate 341 to slide. The sealing plate 341 is an elastic and telescopic structure. The fixed section of the sealing plate 341 is connected to the heat insulation cover 33 by a spring (not shown in the figure). The end of the telescopic section of the sealing plate 341 away from the fixed section of the sealing plate 341 is arc-shaped to adapt to the shape of the end plate sidewall and fits against the end plate sidewall during welding.

[0046] The space between the ends of the two insulation covers 33 is the welding station. Each time, the toothed seats that are 180 degrees apart can be welded. During welding, the position of the toothed seats is limited by existing robotic arms or fixtures, and the surface of the toothed seats to be welded is made to fit against the side wall of the end cover. Then, the welding is carried out by existing welding equipment.

[0047] During the welding process, the sealing plate 341 is pushed by the pushing component 342, so that the sealing plate 341 is completely located inside the insulation cover 33. The telescopic end of the sealing plate 341 is in contact with the side wall of the end plate. With the combined action of the sealing plate 341, the insulation cover 33, the end plate, and the sealing ring 35, the internal space of the insulation cover 33 is isolated from the outside, thereby insulating the welded tooth seat.

[0048] After the two corresponding tooth seats are welded, the insulation cover 33 is manually rotated. After rotation, the pushing component 342 separates from the sealing plate 341. Under the elastic force of the installed spring, the sealing plate 341 moves outward from the insulation cover 33 to avoid the tooth seats that have just been welded and the protruding structures on the side wall of the end plate. When the insulation cover 33 rotates to the next position to be welded, the rotation stops, and the pushing component 342 pushes the sealing plate 341 back into the insulation cover 33. Since the sealing plate 341 is a telescopic structure, even if its telescopic section comes into contact with the tooth seats or protruding structures, it will not affect the rotation of the insulation cover 33.

[0049] It should be noted that the internal space of the insulation cover 33 can be selected according to actual needs, ensuring that it can simultaneously provide insulation and protection for multiple welded tooth seats.

[0050] It should also be noted that, in order to further reduce the gap between the end plate and the insulation cover 33 during welding, thereby slowing down the heat loss, a closed cover 36 with an upper and lower elastic telescopic structure is fixedly installed at the end of the horizontal section of the insulation cover 33. The bottom of the closed cover 36 can be provided with ball bearings to reduce the friction between it and the end plate.

[0051] Reference Figure 3 The pushing components 342 are evenly distributed around the fixed cylinder 21 on the workbench 1. The number and distribution spacing of the pushing components 342 are determined according to the number and distribution spacing of the toothed seats to be welded on the end cover. The pushing components 342 include a first pushing column 343 and a second pushing column 344 fixedly installed on the workbench 1. The fixed section of the sealing plate 341 penetrates the side wall of the heat insulation cover 33 and is fixedly installed with an inclined guide plate 345. There are a total of four inclined guide plates 345 on the two heat insulation covers 33. The four inclined guide plates 345 are divided into front and rear groups, and the front and rear groups of inclined guide plates 345 are centrally symmetrically distributed.

[0052] By cooperating with the corresponding No. 1 pushing column 343 and No. 2 pushing column 344, the end of the telescopic section of the sealing plate 341 is driven to fit against the side wall of the end plate to form a relatively closed heat-insulating space. During the rotation of the heat-insulating cover 33, the two sets of centrally symmetrically distributed inclined guide plates 345 can promptly avoid the two newly welded tooth seats.

[0053] Reference Figure 2 and Figure 7 In the same group of two inclined guide plates 345, one inclined guide plate 345 is located on the upper part of the fixed section of the sealing plate 341, and the other inclined guide plate 345 is located on the lower part of the fixed section of the sealing plate 341. Correspondingly, the first pushing column 343 and the second pushing column 344 are staggered vertically to avoid the inclined guide plate 345 being pushed and colliding with the tooth seat before it is rotated into position, which would affect the firmness of the tooth seat welding.

[0054] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

[0056] The above provides a detailed description of the auxiliary welding device for the end plate of the spiral drum of a coal mining machine provided by the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A welding auxiliary device for the end disc of a coal mining machine spiral drum, characterized in that, Includes a workbench, an end plate fixing mechanism mounted on the workbench, and a heat preservation mechanism mounted on the end plate fixing mechanism; The end plate fixing mechanism includes a fixed cylinder fixedly installed in the middle of the workbench, multiple clamping components evenly arranged circumferentially on the side wall of the fixed cylinder for internal support and fixing of the end plate, and a driving component for driving the multiple clamping components to slide synchronously along the radial direction of the fixed cylinder. The insulation mechanism includes a mounting ring that is detachably and slidably connected to the upper end of the fixed cylinder, two connecting frames symmetrically mounted on the upper end of the mounting ring, an insulation cover mounted on the end of the connecting frame away from the mounting ring, and a sealing component for intermittently sealing the front and rear ends of the insulation cover. The insulation cover, the sealing component and the end plate side wall cooperate to form an insulation and protection structure during the welding process of the tooth seat.

2. The auxiliary device for welding the end disc of the spiral drum of a coal mining machine according to claim 1, characterized in that, The clamping assembly includes a sliding rod that is slidably connected to the fixed cylinder in the radial direction. A clamping plate is fixedly installed at one end of the sliding rod outside the fixed cylinder. The clamping plate has an arc surface structure and a flange for limiting the upper end of the end plate is provided at the upper end of the clamping plate.

3. The auxiliary device for welding the end disc of the spiral drum of a coal mining machine according to claim 1, characterized in that, The drive assembly includes a drive disk, and multiple guide rods for guiding the drive disk are installed between the upper and lower inner walls of the fixed cylinder. The drive disk is slidably mounted between the multiple guide rods, and the drive disk has an inverted frustum-shaped structure. The clamping assembly has a mating block installed at one end inside the fixed cylinder. The side of the mating block near the drive disk has an inclined structure that fits against the side wall of the drive disk. A screw is rotatably installed on the upper end of the drive disk. The screw is threadedly connected to the fixed cylinder, and the upper end of the screw is located outside the fixed cylinder.

4. The auxiliary device for welding the end disc of the spiral drum of a coal mining machine according to claim 3, characterized in that, The lower end of the mounting ring is located inside the fixed cylinder, and an annular guide groove is provided on the inner surface of the lower end of the mounting ring; the upper inner wall of the fixed cylinder is symmetrically provided with plug-in blocks that slide radially along it, and a return spring is connected between the plug-in blocks and the fixed cylinder, and the end of the plug-in block is plugged into the guide groove.

5. The auxiliary device for welding the end disc of the spiral drum of a coal mining machine according to claim 4, characterized in that, The drive assembly also includes sliding rods that are slidably mounted on the upper end of the drive disk and correspond one-to-one with the plug-in blocks. The upper end of the sliding rod slides through the upper end face of the fixed cylinder and is fixedly mounted with a pressure block. The middle part of the sliding rod is slidably connected to the extension plate fixedly mounted on the side wall of the plug-in block. The upper end face of the fixed cylinder is symmetrically mounted with push blocks that correspond one-to-one with the pressure blocks. The upper end face of the pressure block and the lower end face of the push block have a mutually fitting inclined structure.

6. The auxiliary device for welding the end disc of the spiral drum of a coal mining machine according to claim 3, characterized in that, The heat insulation cover has an arc structure and an inverted L-shaped cross-section, with a sealing ring snapped into the lower ends of the left and right heat insulation covers.

7. The auxiliary device for welding the end disc of a coal mining machine spiral drum according to claim 6, characterized in that, The upper end of the workbench is provided with an annular groove for the closed ring to rotate. A limiting rod that is slidably connected to the outer ring wall of the closed ring is installed on the outer ring wall of the annular groove. A ball bearing that contacts the inner ring wall of the annular groove is rotatably installed on the inner ring wall of the closed ring. A ball bearing is also rotatably installed on the upper end of the annular groove.

8. The auxiliary device for welding the end disc of the spiral drum of a coal mining machine according to claim 1, characterized in that, The sealing assembly includes a sealing plate that is elastically and horizontally slidably installed at the end of the heat insulation cover and a pushing member for driving the sealing plate to slide. The sealing plate is an elastic and telescopic structure, and the end of the telescopic section of the sealing plate away from the fixed section of the sealing plate is arc-shaped.

9. The auxiliary device for welding the end disc of the spiral drum of a coal mining machine according to claim 8, characterized in that, The extrusion components are evenly distributed on the worktable along the circumference of the fixed cylinder. The extrusion components include a No. 1 extrusion column and a No. 2 extrusion column that are fixedly installed on the worktable. The sealing plate fixing section penetrates the side wall of the insulation cover and is fixedly installed with inclined guide plates. There are a total of four inclined guide plates on the two insulation covers. The four inclined guide plates are divided into front and rear groups, and the front and rear groups of inclined guide plates are centrally symmetrically distributed.

10. The auxiliary device for welding the end disc of the spiral drum of a coal mining machine according to claim 9, characterized in that, In the same group of two inclined guide plates, one inclined guide plate is located at the upper part of the sealing plate fixing section, and the other inclined guide plate is located at the lower part of the sealing plate fixing section. Correspondingly, the No. 1 and No. 2 push columns are distributed alternately.

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