Aluminum pipe fitting inner wall polishing equipment

Abstract

The invention relates to the technical field of aluminum pipe polishing, and discloses aluminum pipe fitting inner wall polishing equipment which comprises a placing part, the placing part comprises a sliding rail base, the upper surface of the sliding rail base is slidably connected with a sliding seat through a sliding groove, and the sliding seat is connected with a placing plate through an elastic piece arranged on the upper surface of the sliding seat; the upper surface of the placing plate is fixedly connected with an electric push rod through a support, the output end of the electric push rod is fixedly connected with a clamping plate and a polishing part which are attached to the outer surface of the circumference of the external aluminum pipe, the polishing part comprises a rack, and the upper surface of the sliding rail base is fixedly connected with the lower surface of the rack through a machine base. The aluminum pipe fitting inner wall polishing equipment can effectively solve the problems that in the prior art, a traditional mechanical polishing method is generally low in efficiency, equipment adopted for rough polishing and equipment adopted for fine polishing are different, an aluminum pipe subjected to rough polishing needs to be transferred and positioned for the second time, a large amount of manpower and material resources are wasted, and automatic production is not facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum tube polishing, and in particular to an aluminum tube inner wall polishing device. Background Art

[0002] When aluminum tubes are used to transport fluids, especially media with high cleanliness requirements such as food, medicine or chemical reagents, polishing the inner wall can reduce media contamination and ensure the purity of the transmitted media; when transporting high-pressure fluids, the polished inner wall can reduce the resistance to fluid flow, reduce turbulence and pressure loss, and also prevent accelerated corrosion of the fluid caused by the rough inner wall.

[0003] The purpose of rough polishing is to remove the oxide layer, rust, scratches and other surface defects on the inner wall of the aluminum tube, laying the foundation for the subsequent fine polishing. The purpose of fine polishing is to improve the surface finish of the inner wall of the aluminum tube and meet certain roughness requirements. It is suitable for occasions with high requirements for cleanliness and finish. Traditional mechanical polishing methods are usually inefficient, and the equipment used for rough polishing and fine polishing is different. Therefore, the aluminum tube after rough polishing needs to be transferred and positioned for the second time, which wastes a lot of manpower and material resources and is not conducive to automated production. Summary of the invention

[0004] Technical issues solved In view of the above-mentioned shortcomings of the prior art, the present invention provides an inner wall polishing device for aluminum pipe fittings, which can effectively solve the problems in the prior art that the traditional mechanical polishing method is usually inefficient, the equipment used for rough polishing and fine polishing are different, and the aluminum pipe after rough polishing needs to be transferred and positioned for the second time, which wastes a lot of manpower and material resources and is not conducive to automated production. Technical Solution

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides an aluminum pipe inner wall polishing device, comprising: A placement part, the placement part comprises a slide rail base, the upper surface of the slide rail base is slidably connected to a slide seat through a slide groove, the slide seat is connected to a placement plate through an elastic member arranged on the upper surface thereof, the upper surface of the placement plate is fixedly connected to an electric push rod through a bracket, and the output end of the electric push rod is fixedly connected to a clamping plate that fits the outer surface of the circumference of the external aluminum tube; The polishing part includes a frame, the upper surface of the slide rail base is fixedly connected to the lower surface of the frame through the frame, the internal rotation of the frame is connected to a rotating shaft, the rotating shaft is fixedly connected to one end close to the clamping plate with a driving rod assembly, and the driving rod assembly is installed with a telescopic member through a driving block sleeved on the outer surface of the circumference; The telescopic members are provided with two groups and are symmetrically distributed with the driving block as the center. The bottom end of the telescopic members of the left group is connected to a rough grinding block, and the bottom end of the telescopic members of the right group is connected to a fine grinding block. Wherein, a magnetic attraction component which can be used to limit the telescopic length of the telescopic component is fixedly connected to the circumferential outer surface of the driving block.

[0006] Furthermore, an arc-shaped supporting plate tightly fitting with the circumferential outer surface of the external aluminum tube is fixedly connected to the upper surface of the placement plate, and the central axis of the rotating shaft is located above the central axis of the external aluminum tube.

[0007] Furthermore, the driving rod assembly includes a driving rod, the end of the driving rod away from the clamping plate is fixedly connected to the outer end of the rotating shaft, the circumferential outer surface of the driving rod is fixedly connected to a sector block, and the circumferential outer surface of the driving rod is sleeved with a limiting ring connected to the side of the sector block.

[0008] Furthermore, a rotating hole and a fan-shaped hole are respectively opened inside the driving block, the circumferential outer surface of the driving rod is rotatably connected to the inner wall of the rotating hole, the arc surface of the fan-shaped block slides in contact with the inner wall of the fan-shaped hole, and two limit rings are provided and symmetrically distributed with the driving block as the center.

[0009] Furthermore, the telescopic member includes an inner connecting rod, the top end of which is fixedly connected to the circumferential outer surface of the driving block, the outer surface of the inner connecting rod is slidably connected to an external tube, and a square hole is provided on the side of the external tube, the side of the inner connecting rod is fixedly connected to an edge extension plate that slides with the inner wall of the square hole, and the edge extension plate is connected to the side ear block of the external tube via a strong spring arranged on its upper surface.

[0010] Furthermore, a card slot is provided on the side of the inner connecting rod close to the magnetic attraction part, and a card hole matched with the card slot is provided on the side of the outer connecting rod close to the magnetic attraction part. The outer connecting rod is fixedly connected to an L-shaped block via an L-shaped rod arranged on its outer surface, and the outer surface of the L-shaped block is slidably connected to a card block fitted with the card slot, and the side square groove of the card block is provided with a return spring connected to the outer surface of the L-shaped block.

[0011] Furthermore, the magnetic attraction component includes a mounting bracket, the top of the mounting bracket is fixedly connected to the circumferential outer surface of the limiting ring, the end of the mounting bracket away from the limiting ring is fixedly connected to a socket that engages with the outer surface of the external tube, and the lower surface of the socket is fixedly connected to a magnetic plate that is magnetically connected to the outer surface of the block. Beneficial Effects

[0012] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is provided with an arc-shaped supporting plate, a clamping plate, a telescopic part, a rough grinding block and a fine grinding block magnetic suction part. The aluminum tube to be processed is first placed on the upper surface of the arc-shaped supporting plate, and then the output end of the electric push rod drives the clamping plate to clamp the circumferential outer surface of the aluminum tube. The aluminum tube is combined into a whole with the placing plate, the arc-shaped supporting plate, the electric push rod and the clamping plate. During rough polishing, the rotating shaft drives the driving rod, the sector block and the limit ring to rotate clockwise synchronously. The arc surface of the sector block fits the inner wall of the sector hole and rotates clockwise about degrees. The side of the sector block fits the inner wall of the sector hole. At this time, the limit ring drives the magnetic suction part to rotate about degrees synchronously, triggering the corresponding telescopic part. The coarse grinding block will grind the inner wall of the aluminum tube under the action of centrifugal force. Similarly, during fine polishing, the rotating shaft can rotate counterclockwise, and the telescopic part corresponding to the fine grinding block is triggered by the magnetic plate on the fine grinding block, which greatly improves the polishing efficiency of the inner wall of the aluminum tube. In the early stage without stopping the machine, the rotation direction of the rotating shaft can be changed, and the magnetic suction part and the telescopic part can be used to quickly switch from the coarse grinding block to the fine grinding block, eliminating the trouble of secondary transfer and positioning of the rough and fine polishing of the aluminum tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the placement part according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a three-dimensional partial cross-section of a polishing part according to an embodiment of the present invention; Figure 5 It is a schematic structural diagram of a partial three-dimensional separation of the polishing part in an embodiment of the present invention; Figure 6 This is a schematic diagram of the three-dimensional multi-state structure of the polishing part of an embodiment of the present invention; Figure 7 For the embodiment of the present invention Figure 6 A schematic diagram of the structure with a partial enlargement at the center; Figure 8 It is a schematic structural diagram of the three-dimensional separation of the telescopic parts according to an embodiment of the present invention.

[0015] The numbers in the figure represent: 1, placement part; 11, slide rail base; 12, slide seat; 13, elastic member; 14, placement plate; 141, arc-shaped support plate; 15, electric push rod; 16, clamping plate; 2, polishing part; 21, frame; 22, rotating shaft; 23, driving rod assembly; 231, driving rod; 232, sector block; 233, limiting ring; 24, driving block; 241, rotating hole; 242, sector hole; 2 5. Telescopic member; 251. Internal connecting rod; 2511. Edge extension plate; 2512. Powerful spring; 2513. Card slot; 252. External tube; 2521. Square hole; 2522. Card hole; 2523. L-shaped rod; 2524. L-shaped block; 2525. Card block; 2526. Return spring; 26. Rough grinding block; 27. Fine grinding block; 28. Magnetic member; 281. Mounting frame; 282. Card holder; 283. Magnetic plate. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0017] The present invention will be further described below in conjunction with the embodiments. Example

[0018] See also Figure 1-Figure 8 The present invention provides a technical solution: an aluminum pipe inner wall polishing device, comprising: The placing part 1 comprises a slide rail base 11, the upper surface of the slide rail base 11 is slidably connected with a slide seat 12 through a slide groove, the slide seat 12 is connected with a placing plate 14 through an elastic member 13 arranged on the upper surface thereof, the upper surface of the placing plate 14 is fixedly connected with an electric push rod 15 through a bracket, and the output end of the electric push rod 15 is fixedly connected with a clamping plate 16 that fits the outer surface of the circumference of the external aluminum tube; The polishing part 2 includes a frame 21, the upper surface of the slide rail base 11 is fixedly connected to the lower surface of the frame 21 through the frame, the internal rotation of the frame 21 is connected to a rotating shaft 22, the rotating shaft 22 is fixedly connected to one end close to the clamping plate 16 with a driving rod assembly 23, and the driving rod assembly 23 is installed with a telescopic member 25 through a driving block 24 sleeved on the outer surface of the circumference thereof; There are two groups of telescopic members 25, which are symmetrically distributed around the driving block 24. The bottom end of the telescopic member 25 on the left side is connected to a rough grinding block 26, and the bottom end of the telescopic member 25 on the right side is connected to a fine grinding block 27. The outer circumferential surface of the driving block 24 is fixedly connected with a magnetic attraction member 28 which can be used to limit the telescopic length of the telescopic member 25 .

[0019] An arc-shaped supporting plate 141 that is closely fitted to the outer circumferential surface of the outer aluminum tube is fixedly connected to the upper surface of the placement plate 14, and the central axis of the rotating shaft 22 is located above the central axis of the outer aluminum tube.

[0020] The driving rod assembly 23 includes a driving rod 231, the end of the driving rod 231 away from the clamping plate 16 is fixedly connected to the outer end of the rotating shaft 22, the circumferential outer surface of the driving rod 231 is fixedly connected to a sector block 232, and the circumferential outer surface of the driving rod 231 is sleeved with a limiting ring 233 connected to the side of the sector block 232.

[0021] A rotating hole 241 and a fan-shaped hole 242 are respectively opened inside the driving block 24, the circumferential outer surface of the driving rod 231 is rotatably connected to the inner wall of the rotating hole 241, the arc surface of the fan-shaped block 232 slides in contact with the inner wall of the fan-shaped hole 242, and two limiting rings 233 are provided and are symmetrically distributed with the driving block 24 as the center.

[0022] The telescopic member 25 includes an inner connecting rod 251, the top end of which is fixedly connected to the circumferential outer surface of the driving block 24, the outer surface of the inner connecting rod 251 is slidably connected to an outer tube 252, and a square hole 2521 is provided on the side of the outer tube 252, the side of the inner connecting rod 251 is fixedly connected to an edge extension plate 2511 that slides with the inner wall of the square hole 2521, and the edge extension plate 2511 is connected to the side ear block of the external tube 252 via a strong spring 2512 arranged on its upper surface.

[0023] A slot 2513 is provided on the side of the inner connecting rod 251 close to the magnetic attraction member 28, and a hole 2522 matched with the slot 2513 is provided on the side of the outer connecting rod 252 close to the magnetic attraction member 28. The outer connecting rod 252 is fixedly connected to an L-shaped block 2524 via an L-shaped rod 2523 arranged on its outer surface, and a block 2525 fitting with the slot 2513 is slidably connected to the outer surface of the L-shaped block 2524, and a return spring 2526 connected to the outer surface of the L-shaped block 2524 is arranged in the side square groove of the block 2525.

[0024] The magnetic attraction component 28 includes a mounting frame 281, the top of which is fixedly connected to the circumferential outer surface of the limiting ring 233, and the end of the mounting frame 281 away from the limiting ring 233 is fixedly connected to a socket 282 that engages with the outer surface of the external tube 252, and the lower surface of the socket 282 is fixedly connected to a magnetic plate 283 that is magnetically connected to the outer surface of the block 2525.

[0025] refer to Figure 1-8The traditional mechanical polishing method is usually inefficient, and the equipment used for rough polishing and fine polishing is different. Therefore, the aluminum tube after rough polishing needs to be transferred and positioned for the second time, which wastes a lot of manpower and material resources and is not conducive to automated production. In order to overcome the above-mentioned defects, the present invention designs an aluminum pipe inner wall polishing device.

[0026] Placement of aluminum tube: Initially, the electric push rod 15 on the placement part 1 is in a loose state, and the aluminum tube to be processed is placed on the upper surface of the arc-shaped support plate 141. Then, the output end of the electric push rod 15 drives the clamping plate 16 to clamp the outer circumferential surface of the aluminum tube. The aluminum tube is combined with the placement plate 14, the arc-shaped support plate 141, the electric push rod 15 and the clamping plate 16 into a whole, and the elastic member 13 is elastically deformed under pressure (the elastic member 13 is preferably a spring group). At the same time, the slide rail base 11 can drive the slide 12, the elastic member 13, the placement plate 14, the arc-shaped support plate 141, the electric push rod 15, the clamping plate 16 and the aluminum tube to move synchronously toward the side of the polishing part 2, and with the help of the driving rod assembly 23, the driving block 24, the telescopic member 25, the rough grinding block 26 and the fine grinding block 27 on the polishing part 2, the rough and fine integrated grinding of the inner wall of the aluminum tube is achieved. It is worth noting that after the aluminum tube is placed, the elastic member 13 is compressed under the action of its own gravity. After it becomes stable, the central axis of the aluminum tube is located directly below the central axis of the rotating shaft 22 .

[0027] Polishing of aluminum tube: In the initial state, under the joint gravity of the two groups of telescopic parts 25, the coarse grinding block 26 and the fine grinding block 27, the coarse grinding block 26 and the fine grinding block 27 are respectively distributed on both sides of the telescopic part 25. At this time, the magnetic suction part 28 is in a free hanging state and does not contact with any group of telescopic parts 25. The telescopic part 25 is under the elastic force of the strong spring 2512. At this time, the length formed by the inner connecting rod 251 and the outer connecting rod 252 is the shortest, so that the coarse grinding block 26 and the fine grinding block 27 do not contact the inner wall of the aluminum tube, which facilitates the coarse grinding block 26 and the fine grinding block 27 to slide into the aluminum tube. At the same time, the fan-shaped block 232 on the driving rod assembly 23 is located about the middle of the fan-shaped hole 242.

[0028] During rough polishing (the rotating shaft 22 rotates clockwise), the servo motor starts, and its output end drives the rotating shaft 22 to rotate clockwise, driving the driving rod 231, the fan-shaped block 232 and the limit ring 233 on the driving rod assembly 23 to rotate clockwise synchronously, and the arc surface of the fan-shaped block 232 fits the inner wall of the fan-shaped hole 242 to rotate, and the clockwise rotation is about 15 degrees. The side of the fan-shaped block 232 fits the inner wall of the fan-shaped hole 242, and then, the driving rod 231 uses the fan-shaped block 232 and the limit ring 233 to drive the driving block 24 to rotate clockwise synchronously, thereby driving the telescopic member 25, the rough grinding block 26 and the fine grinding block 27 to rotate clockwise synchronously. At the same time, when the sector block 232 rotates 15 degrees, the limiting ring 233 drives the mounting frame 281, the clamping seat 282, and the magnetic plate 283 on the magnetic attraction member 28 to rotate synchronously, and the clamping seat 282 is engaged with the outer surface of the external tube 252, and drives it to rotate synchronously with the clamping seat 282 (to improve the stability of the external tube 252). At this time, the magnetic force of the magnetic plate 283 acts on the clamping block 2525 (the side of the clamping block 2525 close to the magnetic plate 283 adopts a magnetic design), and the side square groove of the clamping block 2525 is along the L-shaped block 25 24 slides, the reset spring 2526 is compressed and elastically deformed, the block 2525 is disengaged from the slot 2513, and the limit on the inner connecting rod 251 disappears. Under the action of centrifugal force, the inner connecting rod 251 overcomes the elastic force of the strong spring 2512, drives the rough grinding block 26 to gradually fit the inner wall of the aluminum tube, and the rough grinding block 26 rotates in a circle to start rough polishing the inner wall of the aluminum tube, and cooperates with the slide rail base 11 to drive the slide 12, the placement plate 14, the clamping plate 16 and the aluminum tube to move forward, completing the overall polishing of the inner wall of the aluminum tube. Similarly, during fine polishing, the rotating shaft 22 can rotate counterclockwise, and the magnetic plate 283 on the fine grinding block 27 triggers the telescopic member 25 corresponding to the fine grinding block 27, which greatly improves the polishing efficiency and accuracy of the inner wall of the aluminum tube, and saves the trouble of secondary transfer and positioning of the rough and fine polishing of the aluminum tube.

[0029] In summary, the present invention adopts the design of the placement portion 1 and the drive rod assembly 23, the drive block 24, the telescopic member 25, the rough grinding block 26 and the fine grinding block 27, which has the following advantages: Advantage 1: After the aluminum tube is placed on the arc-shaped support plate 141, the two sets of clamping plates 16 clamp it, and under the action of its own gravity, the elastic member 13 is driven to be compressed, and after it is stable, the central axis of the aluminum tube is located directly below the central axis of the rotating shaft 22. In the subsequent grinding process of the rough grinding block 26 (or fine grinding block 27), the rough grinding block 26 cooperates with the telescopic member 25 to closely fit the inner wall of the aluminum tube for rotational grinding. At the same time, during the grinding process of the rough grinding block 26, the rough grinding block 26 will drive the aluminum tube, the clamping plate 16, etc. to swing, accelerate the separation of impurities on the inner wall, and meet the grinding of aluminum tubes with different diameters within a certain range.

[0030] Advantage 2: When the driving block 24 rotates clockwise, it will drive the telescopic member 25, the coarse grinding block 26, the fine grinding block 27 and the magnetic member 28 to rotate synchronously. Since the telescopic member 25 is provided with two groups, corresponding to the coarse grinding block 26 and the fine grinding block 27 respectively (the angle between the coarse grinding block 26 and the fine grinding block 27 is about 30 degrees, and “the two are always located on the same side”), it can be seen from the above that when the magnetic member 28 rotates clockwise, it will trigger the telescopic member 25 corresponding to the coarse grinding block 26. The coarse grinding block 26 will grind the inner wall of the aluminum tube under the action of centrifugal force, and generate thrust to the aluminum tube to make it swing (the length of the coarse grinding block 26 from the rotation center axis is greater than the length of the fine grinding block 27 from the rotation center axis), so as to avoid the fine grinding block 27 contacting the inner wall of the aluminum tube and damaging the fine grinding block 27 during the rough polishing process.

[0031] Advantage three, the driving rod 231, the fan-shaped block 232 and the limiting ring 233 are driven by the rotating shaft 22 to rotate clockwise synchronously, and the arc surface of the fan-shaped block 232 fits the inner wall of the fan-shaped hole 242 to rotate, and the clockwise rotation is about 15 degrees. The side of the fan-shaped block 232 fits the inner wall of the fan-shaped hole 242. At this time, the limiting ring 233 drives the magnetic suction part 28 to rotate about 15 degrees synchronously, triggering the corresponding telescopic part 25. The telescopic part 25 that is not triggered will remain constant. The two do not interfere with each other, and only one group of telescopic parts 25 can be triggered at a time.

[0032] Advantage four: without stopping the machine, by changing the rotation direction of the rotating shaft 22, with the help of the magnetic suction part 28 and the telescopic part 25, the rough grinding block 26 can be quickly switched to the fine grinding block 27 for grinding (the telescopic part 25 can realize automatic reset), the overall automation level is high, and the operation is simple and convenient.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aluminum pipe inner wall polishing device, characterized in that: include: A placement portion (1), the placement portion (1) comprising a slide rail base (11), the upper surface of the slide rail base (11) being slidably connected to a slide seat (12) via a slide groove, the slide seat (12) being connected to a placement plate (14) via an elastic member (13) arranged on its upper surface, the upper surface of the placement plate (14) being fixedly connected to an electric push rod (15) via a bracket, and the output end of the electric push rod (15) being fixedly connected to a clamping plate (16) that fits the outer circumferential surface of an external aluminum tube; A polishing part (2), the polishing part (2) comprising a frame (21), the upper surface of the slide rail base (11) being fixedly connected to the lower surface of the frame (21) via the frame, the frame (21) being internally rotatably connected to a rotating shaft (22), the rotating shaft (22) being fixedly connected to one end close to the clamping plate (16) with a driving rod assembly (23), and the driving rod assembly (23) being provided with a telescopic member (25) via a driving block (24) sleeved on the outer circumferential surface thereof; The telescopic members (25) are provided in two groups and are symmetrically distributed with the driving block (24) as the center, the bottom end of the telescopic members (25) of the left group is connected to a rough grinding block (26), and the bottom end of the telescopic members (25) of the right group is connected to a fine grinding block (27); Wherein, a magnetic attraction member (28) which can be used to limit the telescopic length of the telescopic member (25) is fixedly connected to the circumferential outer surface of the driving block (24).

2. The inner wall polishing device of an aluminum pipe according to claim 1, characterized in that: An arc-shaped supporting plate (141) that is tightly fitted to the circumferential outer surface of the external aluminum tube is fixedly connected to the upper surface of the placement plate (14), and the central axis of the rotating shaft (22) is located above the central axis of the external aluminum tube.

3. The inner wall polishing device of an aluminum pipe according to claim 1, characterized in that: The driving rod assembly (23) comprises a driving rod (231), one end of the driving rod (231) away from the clamping plate (16) being fixedly connected to the outer end of the rotating shaft (22), a sector block (232) being fixedly connected to the circumferential outer surface of the driving rod (231), and a limiting ring (233) connected to the side surface of the sector block (232) being sleeved on the circumferential outer surface of the driving rod (231).

4. The inner wall polishing device of an aluminum pipe according to claim 3, characterized in that: The driving block (24) is provided with a rotating hole (241) and a fan-shaped hole (242) therein respectively; the circumferential outer surface of the driving rod (231) is rotatably connected to the inner wall of the rotating hole (241); the arc surface of the fan-shaped block (232) slides in contact with the inner wall of the fan-shaped hole (242); and two limit rings (233) are provided and are symmetrically distributed around the driving block (24).

5. The inner wall polishing device of an aluminum pipe according to claim 3, characterized in that: The telescopic member (25) comprises an inner connecting rod (251), the top end of the inner connecting rod (251) being fixedly connected to the circumferential outer surface of the driving block (24), the outer surface of the inner connecting rod (251) being slidably connected to an outer tube (252), and a square hole (2521) is provided on the side of the outer tube (252), the side of the inner connecting rod (251) being fixedly connected to an edge extension plate (2511) that slides with the inner wall of the square hole (2521), and the edge extension plate (2511) is connected to the side ear block of the outer tube (252) via a strong spring (2512) provided on its upper surface.

6. The inner wall polishing device of an aluminum pipe according to claim 5, characterized in that: A clamping groove (2513) is provided on a side of the inner connecting rod (251) close to the magnetic attraction member (28); a clamping hole (2522) matched with the clamping groove (2513) is provided on a side of the outer connecting rod (252) close to the magnetic attraction member (28); the outer connecting rod (252) is fixedly connected to an L-shaped block (2524) via an L-shaped rod (2523) arranged on its outer surface; a clamping block (2525) fitted with the clamping groove (2513) is slidably connected to the outer surface of the L-shaped block (2524); and a return spring (2526) connected to the outer surface of the L-shaped block (2524) is provided in a side square groove of the clamping block (2525).

7. The inner wall polishing device of an aluminum pipe according to claim 6, characterized in that: The magnetic attraction member (28) comprises a mounting frame (281), the top end of the mounting frame (281) being fixedly connected to the circumferential outer surface of the limiting ring (233), the end of the mounting frame (281) away from the limiting ring (233) being fixedly connected to a holder (282) engaged with the outer surface of the external tube (252), and the lower surface of the holder (282) being fixedly connected to a magnetic plate (283) magnetically connected to the outer surface of the clamping block (2525).

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