Multi-sleeve type inner pipe sleeve welding and mounting device

Abstract

The utility model provides a multi-sleeve type inner pipe sleeve welding installation device which comprises a machine frame, the machine frame is provided with a fixing assembly which is fixedly connected, the fixing assembly comprises an outer rotating component and an outer fixing component, and position adjusting blocks are symmetrically arranged on the surface of the machine frame in the length direction. The position adjusting block is provided with a fixedly connected supporting and rotating assembly, the supporting and rotating assembly comprises a rotating component and an inner fixing component, the outer rotating component and the outer fixing component of the fixing assembly are matched for operation, and casing pipes with different diameters can be installed and fixed before welding; the supporting rotating assembly is provided with a rotating component and an inner fixing component, the rotating component can push the inner fixing component into the casing pipe, the rotating component can drive the casing pipe to rotate through the inner fixing component, and therefore the casing pipe is prevented from deviating in the welding process, and the stability and the welding quality in the welding process are improved. Therefore, welding personnel are prevented from manually adjusting the welding position of the sleeve, and the welding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, in particular to a multi-set inner pipe sleeve welding and installation device. Background Art

[0002] During welding, multiple sets of inner tube sleeves usually need to be installed and fixed on a jig to keep the inner tube sleeves stable during the welding process and avoid movement during the welding process, which affects the welding quality. The traditional inner tube sleeve welding installation device can fix a fixed pipe diameter, which makes it less versatile. When welding pipes of different diameters, it is necessary to replace the installation device corresponding to the specifications for fixing.

[0003] Based on the above situation, in the prior art, a patent with publication number CN212918304U discloses a welding device for metal sleeve processing, which is internally provided with an installation and fixing structure for sleeve welding, the welding device is connected to side support plates on both sides of the front and rear above the placement table, a top plate is connected above the two side support plates, a clamping cylinder is placed above the top plate, the output shaft end of the clamping cylinder is connected to a connecting plate, connecting columns are connected to both sides of the front and rear below the connecting plate, a connecting block is connected below the two connecting columns on one side, an arc-shaped clamping plate is connected below the connecting block, and a welding cylinder is installed on the lower surface of the side support plate. The installation and fixing structure realizes the function of facilitating stable clamping of metal sleeves of different radii on the upper and lower sides by arranging a second support block, an arc-shaped placement plate, a connecting column, a connecting plate, a clamping cylinder, a connecting block and an arc-shaped clamping plate, and has strong stability, mechanical operation and a high degree of automation.

[0004] However, the sleeve installation and fixing structure in the above-mentioned welding device still needs to be improved in light of the actual situation. The above-mentioned installation and fixing structure cannot drive the sleeve to rotate. After the welding operator welds a certain distance on the sleeve, he needs to manually rotate the unwelded part of the sleeve into the operable range of the welding gun, which causes certain inconvenience to the welder and affects the production efficiency to a certain extent. Utility Model Content

[0005] In view of the technical defects existing in the background technology, the utility model proposes a multi-set inner pipe sleeve welding installation device. In order to further solve the above technical problems and meet practical needs, the specific technical solution is as follows:

[0006] A multi-set inner tube sleeve welding and installation device comprises a frame, the frame is provided with a fixedly connected fixing assembly, the fixing assembly is symmetrically arranged on the upper surface of the frame, the fixing assembly comprises an outer rotating part and an outer fixing part, the outer rotating part is fixedly connected to the outer fixing part, the fixing assembly is provided with a fixing channel for fixing the inner tube sleeve, the surface of the frame is symmetrically provided with position adjustment blocks that can slide freely on the frame along the length direction, the position adjustment block is provided with a fixedly connected supporting rotating assembly, the supporting rotating assembly comprises a rotating part and an inner fixing part, the rotating part is fixedly connected to the inner fixing part.

[0007] Furthermore, a first telescopic electric cylinder is provided away from the position adjustment block, and the first telescopic electric cylinder is fixedly connected to the position adjustment block and the frame respectively. A sliding structure is provided between the position adjustment block and the frame, and the sliding structure includes a T-shaped slider arranged on the lower surface of the adjustment block, and a sliding groove arranged on the upper surface of the frame and capable of slidingly cooperating with the T-shaped slider.

[0008] Furthermore, the fixed assembly is provided with a fixed frame, the outer rotating component is arranged inside the fixed frame, the outer rotating component includes a plurality of rollers, a rotating outer ring, a rotating inner ring and a plurality of brackets, the rotating inner ring is arranged inside the rotating outer ring, the rotating outer ring and the rotating inner ring are connected by a bracket, the rollers are arranged between the rotating outer ring and the fixed frame, and the rollers are rotationally symmetrically distributed along the circumference of the rotating outer ring.

[0009] Furthermore, the external fixed component is rotationally symmetrically distributed inside the external rotating component and is arranged between two adjacent brackets. The external fixed component includes a fixed seat, an arc-shaped outer pressure plate and a second telescopic electric cylinder. The fixed seat is fixedly connected to the rotating outer ring, and the cylinder end of the second telescopic electric cylinder is fixedly installed in the fixed seat. The telescopic rod of the second telescopic electric cylinder passes through the rotating inner ring and is fixedly connected to the arc-shaped outer pressure plate at the end. The rotating outer ring, the rotating inner ring and the plurality of arc-shaped outer pressure plates are distributed in concentric circles from the outside to the inside.

[0010] Furthermore, the rotating component includes a third telescopic electric cylinder, a mounting box, a driving motor, a first fixed plate, and a second fixed plate. The telescopic rod end of the third telescopic electric cylinder is connected to the mounting box, the driving motor is arranged inside the mounting box, the mounting box is connected to the first fixed plate on a side away from the third telescopic electric cylinder, the second fixed plate is provided with an installation cavity for installing an internal fixed component on a side away from the first fixed plate, the power output shaft of the driving motor passes through the first fixed plate and is fixedly connected to the second fixed plate, and the mounting box is provided with a heat dissipation groove in the driving motor.

[0011] Furthermore, a rotating ring groove is provided on one side surface of the first fixing plate close to the second fixing plate, and a rotating clamping ring capable of cooperating with the rotating ring groove is provided on one side surface of the second fixing plate close to the first fixing plate.

[0012] Furthermore, the installation cavity is rotationally symmetrically distributed around the center point of the second fixed plate, the number of the internal fixed components corresponds to the number of the installation cavities, the internal fixed components include a fourth telescopic electric cylinder and an arc-shaped inner support plate, the fourth telescopic electric cylinder is installed in the installation cavity, and the fourth telescopic electric cylinder is connected to the arc-shaped inner support plate.

[0013] Beneficial effects of the utility model:

[0014] Through the cooperation of the external rotating part and the external fixed part of the fixing assembly, the casings of different diameters can be installed and fixed on the outside of the casing before welding, thereby avoiding the displacement of the casing during welding and increasing the stability and welding quality during welding. The supporting rotating assembly is provided with a rotating part and an internal fixed part. The rotating part can push the internal fixed part into the interior of the casing. The arc-shaped inner support plate of the internal fixed part is pushed outward by the fourth telescopic electric cylinder and supported on the inner wall of the casing. The rotating part can drive the casing to rotate through the internal fixed part, thereby avoiding the welder to manually adjust the welding position of the casing, reducing the workload of the welder and thus improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the structure of the fixing component of the utility model.

[0017] Figure 3 It is a schematic diagram of the structure of the supporting rotating assembly of the utility model.

[0018] Figure 4 It is a schematic diagram of the structure of the first fixing plate and the second fixing plate of the utility model.

[0019] Figure 5 It is a schematic structural diagram of the second fixing plate and the inner fixing component of the utility model.

[0020] Figure 6 It is a schematic diagram of the sliding structure of the utility model.

[0021] Figure markings: frame 1, position adjustment block 11, sliding structure 12, T-shaped slider 121, slide groove 122, first telescopic electric cylinder 13, fixed component 2, fixed frame 21, outer rotating component 22, roller 221, rotating outer ring 222, rotating inner ring 223, bracket 224, outer fixed component 23, fixed seat 231, arc-shaped outer pressure plate 232, second telescopic electric cylinder 233, fixed channel 24, support rotating component 3, rotating component 31, third telescopic electric cylinder 311, installation box 312, drive motor 313, first fixed plate 314, rotating ring groove 315, second fixed plate 316, rotating clamping ring 317, installation cavity 318, heat dissipation groove 319, inner fixed component 32, fourth telescopic electric cylinder 321, arc-shaped inner support plate 322. DETAILED DESCRIPTION

[0022] like Figures 1 to 6 As shown, the utility model provides a technical solution: a multi-set inner tube sleeve welding and installation device, comprising a frame 1, the frame 1 is provided with a fixedly connected fixing component 2, the fixing component 2 is symmetrically arranged on the upper surface of the frame 1, the fixing component 2 comprises an outer rotating part 22 and an outer fixing part 23, the outer rotating part 22 is fixedly connected to the outer fixing part 23, the fixing component 2 is provided with a fixing channel 24 for fixing the inner tube sleeve, the surface of the frame 1 is symmetrically provided with a position adjustment block 11 that can slide freely on the frame 1 along the length direction, the position adjustment block 11 is provided with a fixedly connected supporting rotating component 3, the supporting rotating component 3 comprises a rotating part 31 and an inner fixing part 32, the rotating part 31 is fixedly connected to the inner fixing part 32.

[0023] The utility model can install and fix sleeves of different diameters before welding. The external fixing component 23 is arranged inside the external rotating component 22. The external fixing component 23 is rotationally symmetrically distributed inside the external rotating component 22, so that the arc-shaped external pressure plates 232 of several external rotating components 22 can enclose and form an annular structure for fixing the sleeve. The arc-shaped external pressure plates 232 are all connected to the second telescopic electric cylinder 233. The second telescopic electric cylinder 233 can drive the arc-shaped external pressure plates 232 to gather or disperse toward the center position of the fixed channel 24, so that the diameter of the annular structure formed by the arc-shaped external pressure plates 232 can be changed, thereby realizing the fixation of sleeves of different diameters.

[0024] The utility model can drive the sleeve to rotate by itself, reduce the workload of welders, and improve welding efficiency. The support rotation component 3 is provided with a rotating part 31 and an inner fixing part 32. The rotating part 31 can push the inner fixing part 32 into the sleeve. After the inner fixing part 32 enters the sleeve, the arc-shaped inner support plate 322 of the inner fixing part 32 is pushed outward from the installation cavity 318 by the fourth telescopic electric cylinder 321 and supported on the inner wall of the sleeve. The driving motor 313 in the rotating part 31 drives the inner fixing part 32 to rotate as a whole, and the inner fixing part 32 drives the sleeve to rotate, thereby avoiding the welder from manually adjusting the sleeve welding position and reducing the workload of the welder.

[0025] As a preferred embodiment of the present invention, Figure 1 and Figure 6 As shown, the position adjustment block 11 is provided with a first telescopic electric cylinder 13 away from the position adjustment block 11, and the first telescopic electric cylinder 13 is respectively fixedly connected to the position adjustment block 11 and the frame 1, and a sliding structure 12 is provided between the position adjustment block 11 and the frame 1, and the sliding structure 12 includes a T-shaped slider 121 arranged on the lower surface of the position adjustment block 11, and a slide groove 122 arranged on the upper surface of the frame 1 and capable of slidingly cooperating with the T-shaped slider 121.

[0026] The position adjustment block 11 is used to support the rotating component 3, specifically, the third telescopic electric cylinder 311 supporting the rotating component 3 is installed on the upper surface of the position adjustment block 11, so that the position adjustment block 11 can drive the supporting rotating component 3 to move as a whole through the third telescopic electric cylinder 311, and the sliding structure 12 is used to increase the stability of the position adjustment block 11 when sliding, the T-shaped slider 121 is engaged with the slide groove 122, and the T-shaped slider 121 can perform limited sliding in the slide groove 122, so as to prevent the position adjustment block 11 from being separated from the upper surface of the frame 1 during the sliding process, and the sliding of the position adjustment block 11 is driven by the first telescopic electric cylinder 13. When it is necessary to significantly adjust the position of the supporting rotating component 3 on the frame, the first telescopic electric cylinder 13 can be started, the telescopic rod of the first telescopic electric cylinder 13 can be greatly shortened or extended, and the supporting rotating component 3 as a whole can be quickly pulled out of the inside of the casing or pushed deeper into the casing through the position adjustment block 11 and the sliding structure 12.

[0027] As a preferred embodiment of the present invention, Figure 1 and Figure 2As shown, the fixed assembly 2 is provided with a fixed frame 21, the outer rotating component 22 is arranged inside the fixed frame 21, the outer rotating component 22 includes a plurality of rollers 221, a rotating outer ring 222, a rotating inner ring 223 and a plurality of brackets 224, the rotating inner ring 223 is arranged inside the rotating outer ring 222, the rotating outer ring 222 and the rotating inner ring 223 are connected by the bracket 224, the rollers 221 are arranged between the rotating outer ring 222 and the fixed frame 21, and the rollers 221 are rotationally symmetrically distributed along the circumference of the rotating outer ring 222.

[0028] The rotating outer ring 222 and the rotating inner ring 223 can provide installation positions for the external fixing component 23. The rotating inner ring 223 between the rotating outer ring 222 and the rotating inner ring 223 is connected by the bracket 224, which can increase the overall structural strength of the rotating outer ring 222 and the rotating inner ring 223, so that the external fixing component 23 can operate stably for a long time. The roller 221 is arranged between the rotating outer ring 222 and the fixing frame 21. The roller 221 can rotate freely, which can reduce the resistance when the sleeve rotates. When the external fixing component 23 is installed and fixed to the sleeve from the outside of the sleeve before welding 1, the external fixing component 23 The arc-shaped outer pressure plate 232 of the component 23 is in close contact with the outer side wall of the sleeve. When the sleeve rotates, the sleeve can drive the outer rotating component 22 as a whole and the rotating outer ring 222 and the rotating inner ring 223 of the outer fixed component 23 to rotate through the arc-shaped outer pressure plate 232. The fixed frame 21 is fixed to the surface of the frame 1 and does not rotate. The rotation resistance of the rotating outer ring 222 is reduced by rotating the roller 221, thereby reducing the workload of the driving motor 313 of the rotating component 31, thereby increasing the stability and service life of the equipment during long-term operation.

[0029] As a preferred embodiment of the present invention, Figure 1 and Figure 2 As shown, the outer fixed component 23 is rotationally symmetrically distributed inside the outer rotating component 22 and is arranged between two adjacent brackets 224. The outer fixed component 23 includes a fixed seat 231, an arc-shaped outer pressure plate 232 and a second telescopic electric cylinder 233. The fixed seat 231 is fixedly connected to the rotating outer ring 222. The cylinder end of the second telescopic electric cylinder 233 is fixedly installed in the fixed seat 231. The telescopic rod of the second telescopic electric cylinder 233 passes through the rotating inner ring 223 and is fixedly connected to the arc-shaped outer pressure plate 232 at the end. The rotating outer ring 222, the rotating inner ring 223 and a plurality of arc-shaped outer pressure plates 232 are distributed in concentric circles from the outside to the inside.

[0030] The outer fixing component 23 is used to clamp and fix the sleeve. The fixing seat 231 is installed on the inner wall of the rotating outer ring 222. The cylinder end of the second telescopic electric cylinder 233 is fixedly installed in the fixing seat 231. The telescopic rod of the second telescopic electric cylinder 233 passes through the rotating inner ring 223, so that the second telescopic electric cylinder 233 can be firmly fixed between the rotating outer ring 222 and the rotating inner ring 223. In the initial state where the arc-shaped outer pressure plate 232 does not clamp the sleeve, the arc-shaped outer pressure plate 232 is driven by the second telescopic electric cylinder 233 and approaches the inner wall of the rotating inner ring 223. When the sleeve needs to be clamped, the sleeve is placed in the fixing channel 24 at this time. The arc-shaped outer pressure plate 232 is driven by the second telescopic electric cylinder 233 to gather toward the center position of the fixing channel 24 until the inner concave surface of the arc-shaped outer pressure plate 232 is close to the outer wall of the sleeve, thereby fixing the sleeve.

[0031] As a preferred embodiment of the present invention, Figure 1 , Figure 3 and Figure 4 As shown, the rotating component 31 includes a third telescopic electric cylinder 311, a mounting box 312, a driving motor 313, a first fixed plate 314, and a second fixed plate 316. The telescopic rod end of the third telescopic electric cylinder 311 is connected to the mounting box 312, and the driving motor 313 is arranged inside the mounting box 312. The mounting box 312 is connected to the first fixed plate 314 on the side away from the third telescopic electric cylinder 311. The second fixed plate 316 is provided with a mounting cavity 318 for installing the internal fixing component 32 on the side away from the first fixed plate 314. The power output shaft of the driving motor 313 passes through the first fixed plate 314 and is fixedly connected to the second fixed plate 316. The mounting box 312 is provided with a heat dissipation groove 319 on the driving motor 313.

[0032] The rotating component 31 is used to drive the inner fixing component 32 to rotate, so that the inner fixing component 32 can drive the sleeve to rotate. The telescopic rod end of the third telescopic electric cylinder 311 is connected to the installation box 312, and the driving motor 313 is arranged inside the installation box 312. The power output shaft of the driving motor 313 passes through the first fixing plate 314 and is connected to the second fixing plate 316, so that the driving motor 313 can drive the second fixing plate 316 to rotate. The inner fixing component 32 is installed in the installation cavity 318 of the second fixing plate 316, so that the inner fixing component 32 can drive the sleeve to rotate. The third telescopic electric cylinder 311 is used to fine-tune the position of the inner fixing component 32 inside the sleeve, so that the arc-shaped inner support plate 322 of the inner fixing component 32 can be supported at the middle section of the sleeve, thereby increasing the stability of the sleeve when rotating. The heat dissipation groove 319 arranged on the top of the installation box 312 can not only dissipate heat for the driving motor 313, but also serve as an installation and maintenance window for the driving motor 313.

[0033] As a preferred embodiment of the present invention, Figure 3 and Figure 4 As shown, a rotating ring groove 315 is provided on one side surface of the first fixing plate 314 close to the second fixing plate 316 , and a rotating clamping ring 317 capable of cooperating with the rotating ring groove 315 is provided on one side surface of the second fixing plate 316 close to the first fixing plate 314 .

[0034] The rotating retaining ring 317 can slide in the rotating ring groove 315, which can increase the stability of the second fixed plate 316 when it is driven by the drive motor 313 to rotate. In order to increase the smoothness of the rotation of the second fixed plate 316, the rotating ring groove 315 can be properly lubricated when the components are running to reduce the rotation resistance of the second fixed plate 316, thereby reducing the operating resistance of the drive motor 313 and increasing the service life of the drive motor 313.

[0035] As a preferred embodiment of the present invention, Figure 1 , Figure 3 and Figure 4 As shown, the installation cavity 318 is rotationally symmetrically distributed around the center point of the second fixed plate 316, and the number of the internal fixed components 32 and the installation cavity 318 corresponds one to one. The internal fixed component 32 includes a fourth telescopic electric cylinder 321 and an arc-shaped inner support plate 322. The fourth telescopic electric cylinder 321 is installed in the installation cavity 318, and the fourth telescopic electric cylinder 321 is connected to the arc-shaped inner support plate 322.

[0036] The inner fixing component 32 is used to form a support for the inner wall of the sleeve, so that the driving motor 313 can drive the sleeve to rotate through the second fixing plate 316, the fourth telescopic electric cylinder 321 and the arc-shaped inner support plate 322. When the inner fixing component 32 is in the initial state, the fourth telescopic electric cylinder 321 retracts and at the same time drives the arc-shaped inner support plate 322 to enter the installation cavity 318, thereby storing and protecting the arc-shaped inner support plate 322. When it is necessary to drive the sleeve to rotate, the telescopic rod of the fourth telescopic electric cylinder 321 is extended to push the arc-shaped inner support plate 322 out of the installation cavity 318, and the outer convex surface of the arc-shaped inner support plate 322 gradually contacts closely with the inner side wall of the sleeve, so that the inner fixing component 32 forms a support inside the inner side wall of the sleeve. In order to increase the friction between the outer convex surface of the arc-shaped inner support plate 322 and the inner side wall of the sleeve, a layer of rubber or silicone can be fixed on the outer convex surface of the arc-shaped inner support plate 322.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-set inner tube casing welding installation device, comprising a frame (1), characterized in that: The frame (1) is provided with a fixedly connected fixing assembly (2), the fixing assembly (2) being symmetrically arranged on the upper surface of the frame (1), the fixing assembly (2) comprising an outer rotating component (22) and an outer fixing component (23), the outer rotating component (22) being fixedly connected to the outer fixing component (23), the fixing assembly (2) being provided with a fixing channel (24) for fixing an inner tube sleeve, and a position adjustment block (11) being symmetrically arranged on the surface of the frame (1) along the length direction and being able to slide freely on the frame (1), the position adjustment block (11) being provided with a fixedly connected supporting rotating assembly (3), the supporting rotating assembly (3) comprising a rotating component (31) and an inner fixing component (32), the rotating component (31) being fixedly connected to the inner fixing component (32).

2. A multi-set inner pipe sleeve welding installation device according to claim 1, characterized in that: A first telescopic electric cylinder (13) is provided away from the position adjustment block (11), the first telescopic electric cylinder (13) being fixedly connected to the position adjustment block (11) and the frame (1) respectively, a sliding structure (12) is provided between the position adjustment block (11) and the frame (1), the sliding structure (12) comprising a T-shaped sliding block (121) provided on the lower surface of the position adjustment block (11), and a sliding groove (122) provided on the upper surface of the frame (1) and capable of slidingly cooperating with the T-shaped sliding block (121).

3. A multi-set inner pipe sleeve welding installation device according to claim 1, characterized in that: The fixing assembly (2) is provided with a fixing frame (21), the outer rotating component (22) is arranged inside the fixing frame (21), the outer rotating component (22) comprises a plurality of rollers (221), a rotating outer ring (222), a rotating inner ring (223) and a plurality of brackets (224), the rotating inner ring (223) is arranged inside the rotating outer ring (222), the rotating outer ring (222) and the rotating inner ring (223) are connected via the bracket (224), the rollers (221) are arranged between the rotating outer ring (222) and the fixing frame (21), and the rollers (221) are distributed in a rotationally symmetrical manner along the circumference of the rotating outer ring (222).

4. A multi-set inner pipe sleeve welding installation device according to claim 3, characterized in that: The outer fixed component (23) is rotationally symmetrically distributed inside the outer rotating component (22) and is arranged between two adjacent brackets (224). The outer fixed component (23) comprises a fixed seat (231), an arc-shaped outer pressure plate (232) and a second telescopic electric cylinder (233). The fixed seat (231) is fixedly connected to the rotating outer ring (222). The cylinder end of the second telescopic electric cylinder (233) is fixedly installed in the fixed seat (231). The telescopic rod of the second telescopic electric cylinder (233) passes through the rotating inner ring (223) and is fixedly connected to the arc-shaped outer pressure plate (232) at the end. The rotating outer ring (222), the rotating inner ring (223) and the plurality of arc-shaped outer pressure plates (232) are distributed in concentric circles from the outside to the inside.

5. The multi-set inner pipe sleeve welding installation device according to claim 1, characterized in that: The rotating component (31) comprises a third telescopic electric cylinder (311), a mounting box (312), a driving motor (313), a first fixing plate (314), and a second fixing plate (316); the telescopic rod end of the third telescopic electric cylinder (311) is connected to the mounting box (312); the driving motor (313) is arranged inside the mounting box (312); a side of the mounting box (312) away from the third telescopic electric cylinder (311) is connected to the first fixing plate (314); a side of the second fixing plate (316) away from the first fixing plate (314) is provided with a mounting cavity (318) for mounting an internal fixing component (32); a power output shaft of the driving motor (313) passes through the first fixing plate (314) and is fixedly connected to the second fixing plate (316); and the mounting box (312) is provided with a heat dissipation groove (319) in the driving motor (313).

6. A multi-set inner pipe sleeve welding installation device according to claim 5, characterized in that: A rotating ring groove (315) is provided on a surface of one side of the first fixing plate (314) close to the second fixing plate (316), and a rotating clamping ring (317) capable of cooperating with the rotating ring groove (315) is provided on a surface of one side of the second fixing plate (316) close to the first fixing plate (314).

7. A multi-set inner pipe sleeve welding installation device according to claim 5, characterized in that: The installation cavities (318) are rotationally symmetrically distributed around a center point of the second fixed plate (316); the number of the internal fixed components (32) and the installation cavities (318) corresponds one to one; the internal fixed components (32) comprise a fourth telescopic electric cylinder (321) and an arc-shaped inner support plate (322); the fourth telescopic electric cylinder (321) is installed in the installation cavity (318); and the fourth telescopic electric cylinder (321) is connected to the arc-shaped inner support plate (322).

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