Intelligent cutting equipment for aluminum alloy pipe

Abstract

The invention relates to the technical field of laser cutting, in particular to intelligent cutting equipment for aluminum alloy pipes, which comprises a machine table, a laser cutting head is arranged on the machine table through a lead screw transmission system, and a chuck for fixing the pipes is arranged on the machine table. The intelligent cutting equipment for the aluminum alloy pipe further comprises an in-pipe buffering mechanism, the in-pipe buffering mechanism comprises a bearing unit arranged in the pipe, a first supporting unit is arranged on the side, facing the chuck, of the bearing unit, a second supporting unit is arranged on the other side of the bearing unit, and a maintaining unit is arranged at the position, corresponding to the bearing unit, of the machine table. Through the high precision and high speed of the laser cutting technology and the ingenious design of the buffer mechanism in the pipe, the problem that slag adheres to the interior of the pipe to form adhering slag is effectively avoided, so that the cutting quality and the product percent of pass are improved, meanwhile, the automation degree and the intelligence degree of the equipment are high, manual intervention is reduced, and the cutting efficiency is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser cutting, in particular to intelligent cutting equipment for aluminum alloy pipes. Background Art

[0002] Laser cutting technology, with its high-power density laser beam, can quickly heat the material to the vaporization point, thereby generating continuous and fine cuts, and achieving efficient and high-precision cutting of various materials. In the field of pipe processing, laser cutting technology is particularly prominent, demonstrating excellent speed and quality advantages.

[0003] However, traditional pipe cutting methods still have certain limitations. Usually, these methods use clamping tools to fix the pipe, leaving one end of the pipe hanging in the air, and then use a laser cutting machine to open holes or cut off the pipe. Although this method is effective, there is a problem: molten metal particles may adhere to the inside of the pipe through the cutting gap, forming slag, which affects the quality of the pipe.

[0004] To solve this problem, the commonly used method is to place buffer material inside the pipe to cover the gap. However, this approach has encountered many challenges in practical applications. First, the friction between the buffer material and the inner wall of the pipe will cause scratches on the inner wall of the pipe, thereby reducing the quality of the pipe. Secondly, when the pipe is rotated or fed, the buffer material is easy to fall off and needs to be manually pushed back in, which not only increases the cumbersomeness of the operation, but also reduces the processing efficiency. In addition, after the surface hole of the pipe is processed, the residual debris inside also needs to be cleaned, which further increases the processing steps and costs. For this reason, we propose an intelligent cutting device for aluminum alloy pipes. Summary of the invention

[0005] In order to solve the above technical problems, the embodiment of the present application provides an intelligent cutting device for aluminum alloy pipes, including a machine platform, a laser cutting head is arranged on the machine platform through a screw transmission system, a chuck for fixing the pipe is arranged on the machine platform, and also includes an in-pipe buffer mechanism:

[0006] The in-pipe buffer mechanism includes a bearing unit arranged in the pipe, the bearing unit is used to block and receive the slag generated during cutting, the bearing unit is provided with a support unit 1 on one side facing the chuck, and a support unit 2 on the other side, the support unit 1 and the support unit 2 can support the inner wall of the pipe;

[0007] A holding unit is provided on the platform at a position corresponding to the carrying unit. The holding unit is located directly below the carrying unit and can enable the carrying unit to always keep its opening facing the laser cutting head to receive the slag.

[0008] In some embodiments, the bearing unit includes a retaining frame arranged inside the tube, slide rails are fixedly arranged on both sides of the retaining frame, slide rods are arranged on both sides of the slide rails, and a bearing plate is arranged on the slide rods.

[0009] In some embodiments, an adjusting screw is rotatably arranged in the slide rail, the adjusting screw thread penetrates the slide rod, and the threads on both sides of the adjusting screw are in opposite directions, a connecting rod is arranged between the slide rods on both sides, and the bearing plate is a flexible metal plate and its two sides are respectively fixedly connected to the connecting rods on both sides;

[0010] A driving motor is arranged at the end of any one of the adjusting screw rods, pulleys are arranged on the outside of the two adjusting screw rods, and a belt is arranged on the outside of the pulleys, and the two adjusting screw rods rotate synchronously through the belt drive.

[0011] In some embodiments, the holding unit includes a plurality of holding magnets 1 fixedly arranged on both sides of the bottom of the holding frame, a support rod is arranged on the machine platform, a support frame is arranged at the end of the support rod, a plurality of holding magnets 2 are fixedly arranged on the support frame, and the holding magnets 1 and 2 repel each other.

[0012] In some embodiments, the support unit one and the support unit two each include a support block, and the side walls of the two support blocks are rotatably provided with connecting shafts, and the two connecting shafts are respectively connected to the slide rails on both sides. A plurality of slots are opened on the outside of the support block, and a rotating rod is rotatably provided in the slot via a rotating shaft, and a universal wheel is provided at the end of the rotating rod.

[0013] In some embodiments, a support spring is disposed in the notch of the support block in the support unit 1, and two ends of the support spring are respectively connected to the bottom of the notch and the rotating rod;

[0014] A support spring is also provided at the bottom slot of the support block in the support unit 2, the end of the support spring is connected to the rotating rod, a magnetic linkage component capable of driving the remaining rotating rods to rotate is provided in the support block, and a driving magnetic block capable of driving the magnetic linkage component to move is provided at the laser cutting head.

[0015] In some embodiments, the magnetic linkage assembly includes a moving rod slidably arranged in a support block, the end of the moving rod is wedge-shaped, and a pull rope is connected to the top of the support block and the front end of the rotating rod on both sides, and the other end of the pull rope is fixedly connected to the moving rod. A top rod is slidably arranged on the support block, and the bottom end of the top rod abuts against the end wedge of the moving rod, and a transmission magnetic block that repel each other with the driving magnetic block is arranged at the top of the top rod.

[0016] In some embodiments, a side plate is fixedly connected to one side of the laser cutting head, and the driving magnetic block is fixedly arranged at the end of the side plate.

[0017] In some embodiments, limiting magnetic blocks 1 are fixedly provided on both sides of the support frame, and limiting magnetic blocks 2 that repel each other with limiting magnetic block 1 are fixedly provided on both sides of the support blocks on both sides.

[0018] In some embodiments, the rotating rod is telescopic, and the rotating rod includes a main rod rotatably set on a support block, a support rod is slidably set in the main rod, the universal wheel is set at the end of the support rod, a movable plate is movably set in the main rod, a connecting spring is set on the movable plate, the end of the connecting spring is fixedly connected to the support rod, an extension plate is fixedly set on the side of the movable plate, a sliding groove for the extension plate to slide is opened on the main rod, a fixed screw rod is rotatably set on the main rod, and the fixed screw rod thread passes through the extension plate.

[0019] The present invention has at least the following beneficial effects:

[0020] 1. Improve cutting quality and efficiency: The high precision and high speed of laser cutting technology, combined with the ingenious design of the buffer mechanism inside the pipe, effectively avoid the problem of slag adhering to the inside of the pipe to form slag, thereby improving the cutting quality and product qualification rate. At the same time, the equipment has a high degree of automation and intelligence, which reduces manual intervention and significantly improves cutting efficiency;

[0021] 2. Strong adaptability: The equipment can be flexibly adjusted according to different types of aluminum alloy pipes (such as round pipes and square pipes), ensuring the matching degree between the shape of the bearing plate and the inner wall of the pipe, avoiding motion interference, and ensuring the stability and continuity of the cutting process;

[0022] 3. Protect the pipe structure: The design of the support unit effectively supports the inner wall of the pipe, prevents the pipe from deforming during the cutting process, and protects the integrity of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the laser cutting head of the present invention;

[0025] Figure 3 It is a partial side view structural schematic diagram of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the support frame of the present invention;

[0027] Figure 5 This is a schematic diagram of the bottom structure of the load-bearing unit of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the buffer mechanism in the tube of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the load-bearing unit of the present invention;

[0030] Figure 8 It is a schematic diagram of the side structure of the load-bearing unit of the present invention;

[0031] Fig. 9 This is a structural schematic diagram of a support unit of the present invention;

[0032] Fig.10 This is a structural schematic diagram of the support unit 2 of the present invention;

[0033] Fig.11 It is a schematic diagram of the structure of the magnetic linkage assembly of the present invention;

[0034] Fig.12 It is a schematic diagram of the cross-sectional structure of the rotating rod of the present invention.

[0035] In the figure: 1-machine table; 2-laser cutting head; 3-buffer mechanism in the tube; 4-bearing unit; 41-holder; 42-slide rail; 43-slide rod; 44-bearing plate; 45-adjusting screw; 46-connecting rod; 5-support unit one; 51-support block; 52-connecting shaft; 53-rotating rod; 54-universal wheel; 55-support spring; 6-support unit two; 7-holding unit; 71-holding magnet one; 72-support rod; 73-support frame; 74-holding magnet two; 8-magnetic linkage assembly; 81-moving rod; 82-pull rope; 83-top rod; 84-transmission magnet; 9-driving magnet; 10-side plate; 11-limiting magnet one; 12-limiting magnet two; 13-main rod; 14-support rod; 15-movable plate; 16-connecting spring; 17-extension plate; 18-fixed screw. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figure 1-Figure 11 The present invention provides a technical solution: an intelligent cutting device for aluminum alloy pipes, including a machine table 1, on which a laser cutting head 2 is arranged through a screw drive system, wherein the screw drive system is common knowledge of the staff in this field and will not be described in detail here, and a chuck for fixing the pipe is arranged on the machine table 1, and the pipe can be driven to rotate and feed through the chuck, and also includes an in-pipe buffer mechanism 3:

[0038] The in-pipe buffer mechanism 3 includes a bearing unit 4 arranged in the pipe, the bearing unit 4 is used to block and receive the slag generated during cutting, to prevent the slag from falling into the pipe and adhering to the pipe to form slag, the bearing unit 4 is provided with a support unit 1 5 on one side facing the chuck, and a support unit 2 6 on the other side, the support unit 1 5 and the support unit 2 6 can support the inner wall of the pipe;

[0039] A holding unit 7 is provided on the machine platform 1 at a position corresponding to the carrying unit 4 . The holding unit 7 is located directly below the carrying unit 4 , and can enable the carrying unit 4 to always keep its opening facing the laser cutting head 2 to receive the slag.

[0040] The bearing unit 4 includes a retaining frame 41 disposed inside the pipe. Slide rails 42 are fixedly disposed on both sides of the retaining frame 41 . Slide rods 43 are disposed on both sides of the slide rails 42 . A bearing plate 44 is disposed on the slide rods 43 .

[0041] An adjusting screw rod 45 is rotatably arranged in the slide rail 42, and the adjusting screw rod 45 threadably penetrates the slide rod 43, and the thread directions on both sides of the adjusting screw rod 45 are opposite, and a connecting rod 46 is arranged between the slide rods 43 on both sides, and the bearing plate 44 is a flexible metal plate and its two sides are fixedly connected to the connecting rods 46 on both sides respectively;

[0042] A driving motor is disposed at the end of any one of the adjusting screw rods 45, and pulleys are disposed on the outside of the two adjusting screw rods 45. A belt is disposed on the outside of the pulleys, and the two adjusting screw rods 45 rotate synchronously through the belt drive;

[0043] Aluminum alloy pipes are usually provided with square pipes and round pipes. When processing round pipes, due to the special shape of the circle, when the pipe is rotated and cut, the bearing plate 44 in the pipe will not form motion interference with the pipe. However, when processing square pipes, if it is to be ensured that the bearing plate 44 can efficiently receive the slag, the opening of the bearing plate 44 in the square pipe must be large enough. At this time, when the square pipe is rotated, the two sides of the bearing plate 44 will have motion interference with the inner wall of the square pipe. Therefore, during processing, it is necessary to periodically adjust the shape of the bearing plate 44 so that it will not affect the normal rotation processing of the square pipe. During adjustment, the driving motor starts to drive the adjusting screw 45 to rotate, and then drives the two slide bars 43 in the slide rail 42 to move. When the slide bars 43 approach each other, the bearing plate 44 can be deformed, so that the two sides of the bearing plate 44 move to the center of the square pipe, so that the square pipe can rotate smoothly. Then the driving motor drives the bearing plate 44 to reset, so as to ensure that the opening of the bearing plate 44 is large enough most of the time, so as to stably carry the slag.

[0044] The holding unit 7 includes a plurality of holding magnetic blocks 71 fixedly arranged on both sides of the bottom of the holding frame 41, a support rod 72 is arranged on the machine table 1, a support frame 73 is arranged at the end of the support rod 72, and a plurality of holding magnetic blocks 74 are fixedly arranged on the support frame 73, and the holding magnetic blocks 71 and 74 repel each other;

[0045] Since the position of the laser cutting head 2 remains unchanged during processing, while the pipe is rotating and feeding, in order to enable the supporting plate 44 to function throughout the entire processing process, the U-shaped opening formed by it needs to always face upwards, through the retaining magnetic block 1 71 on both sides of the retaining frame 41 and the retaining magnetic block 2 74 on the support frame 73, the mutual repulsion between the two ensures that the retaining frame 41 will not rotate with the pipe, thereby ensuring the stable use of the supporting plate 44. On the other hand, the repulsive force generated between the magnetic blocks can also balance the weight of the device in the pipe to avoid deformation of the pipe.

[0046] Support unit 1 5 and support unit 2 6 each include a support block 51, and the side walls of the two support blocks 51 are rotatably provided with connecting shafts 52, and the two connecting shafts 52 are respectively connected to the slide rails 42 on both sides. A plurality of slots are provided on the outer side of the support block 51, and a rotating rod 53 is rotatably provided in the slot through a rotating shaft, and a universal wheel 54 is provided at the end of the rotating rod 53. The rotating rod 53 and the universal wheel 54 at its end can support the inside of the pipe to prevent the pipe from being distorted and deformed after cutting.

[0047] A support spring 55 is arranged in the notch of the support block 51 in the support unit 1 5. The two ends of the support spring 55 are respectively connected to the bottom of the notch and the rotating rod 53. The rotating rod 53 is pressed by the elastic force of the support spring 55, so that it drives the universal wheel 54 to abut against the side wall of the pipe. It should be noted that the elastic force of the support spring 55 needs to be appropriately set, and should not be too large or too small. If it is too large, it will make the device difficult to move in the pipe, and if it is too small, it will make the device unstable in the pipe. During specific use, the staff can adjust it as needed;

[0048] The bottom slot of the support block 51 in the support unit 2 6 is also provided with a support spring 55, the end of the support spring 55 is connected to the rotating rod 53, and a magnetic linkage component 8 capable of driving the remaining rotating rods 53 to rotate is provided in the support block 51. A side plate 10 is fixedly connected to one side of the laser cutting head 2, and the driving magnetic block 9 is fixedly arranged at the end of the side plate 10.

[0049] The magnetic linkage assembly 8 includes a moving rod 81 slidably arranged in the support block 51, the end of the moving rod 81 is wedge-shaped, the top of the support block 51 and the front ends of the rotating rods 53 on both sides are connected with a pull rope 82, the other end of the pull rope 82 is fixedly connected to the moving rod 81, and a top rod 83 is slidably arranged on the support block 51, the bottom end of the top rod 83 abuts against the end wedge of the moving rod 81, and the top end of the top rod 83 is provided with a transmission magnetic block 84 that repel each other with the driving magnetic block 9;

[0050] When the laser cutting head 2 moves downward to cut the pipe, the driving magnet 9 drives the transmission magnet 84 to move through the repulsive force, and the transmission magnet 84 drives the top rod 83 to move downward, and the top rod 83 drives the moving rod 81 to move. The moving rod 81 drives multiple rotating rods 53 to rotate through the pull rope 82, so that the rotating rod 53 drives the universal wheel 54 to abut against the inner wall of the pipe, and the structure is located inside the part of the pipe that needs to be cut off. After the cutting is completed, the driving magnet 9 moves away from the transmission magnet 84, so that the rotating rod 53 no longer has the force to press against the inner wall of the pipe. At this time, the cut pipe falls under the action of its own weight.

[0051] Limiting magnetic blocks 11 are fixedly arranged on both sides of the support frame 73, and limiting magnetic blocks 12 that repel each other with the limiting magnetic blocks 11 are fixedly arranged on both sides of the support blocks 51 on both sides. The limiting magnetic blocks 11 and 12 are both inclinedly arranged, and the repulsive force ensures that the device is always located above the support frame 73, that is, the laser processing location, and will not move due to the movement and feeding of the pipeline, so that the supporting plate 44 is always located on both sides of the pipe cutting line.

[0052] The working process of the intelligent aluminum alloy pipe cutting equipment is as follows: first, the aluminum alloy pipe to be processed is firmly mounted on the chuck on the machine table 1, and then the equipment is started. The laser cutting head 2 starts to accurately cut the pipe under the drive of the screw transmission system. During this process, the bearing unit 4 effectively bears the slag generated by the cutting through the flexible metal bearing plate 44 to prevent it from adhering to the inside of the pipe. At the same time, the holding unit 7 uses the mutual repulsion between the magnetic blocks to ensure that the bearing plate 44 is always facing the laser cutting head 2 and balances the weight of the device to prevent the pipe from deformation. The supporting unit stably supports the inner wall of the pipe through the universal wheel 54 to prevent the pipe from distorting during the cutting process. When the laser cutting head 2 completes the cutting and moves up, the magnetic linkage component 8 automatically releases the pressure on the rotating rod 53, so that the cut pipe falls smoothly. During the entire cutting process, the chuck drives the pipe to be continuously fed, and the laser cutting head 2 continues to work until all cutting tasks are completed. Then the device is taken out and the slag on the bearing plate 44 can be cleaned at the same time.

[0053] Example 2: Please refer to Fig.12In Example 2, on the basis of Example 1, the rotating rod 53 is configured to be telescopic, and the rotating rod 53 includes a main rod 13 rotatably set on the support block 51, a support rod 14 is slidably set in the main rod 13, a universal wheel 54 is set at the end of the support rod 14, a movable plate 15 is movably set in the main rod 13, a connecting spring 16 is set on the movable plate 15, the end of the connecting spring 16 is fixedly connected to the support rod 14, an extension plate 17 is fixedly set on the side of the movable plate 15, a sliding groove for the extension plate 17 to slide is opened on the main rod 13, a fixed screw rod 18 is rotatably set on the main rod 13, and the fixed screw rod 18 threadably penetrates the extension plate 17.

[0054] During adjustment, the fixed screw 18 is rotated to drive the extension plate 17 to move, and the extension plate 17 drives the movable plate 15 to move, thereby adjusting the position of the spring. In this way, not only the overall length of the rotating rod 53 can be adjusted, but also the pressure of the support rod 14 and the universal wheel 54 on the back of the pipe can be adjusted.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. An intelligent cutting device for aluminum alloy pipes, comprising a machine platform (1), a laser cutting head (2) being arranged on the machine platform (1) through a screw drive system, and a chuck for fixing the pipe being arranged on the machine platform (1), characterized in that: It also includes an in-tube buffer mechanism (3): The in-pipe buffer mechanism (3) comprises a bearing unit (4) arranged in the pipe, the bearing unit (4) is used to block and receive slag generated during cutting, the bearing unit (4) is provided with a support unit 1 (5) on one side facing the chuck, and a support unit 2 (6) on the other side, the support unit 1 (5) and the support unit 2 (6) are capable of supporting the inner wall of the pipe; A holding unit (7) is provided on the machine platform (1) at a position corresponding to the carrying unit (4); the holding unit (7) is located directly below the carrying unit (4) and can enable the carrying unit (4) to always maintain an opening facing the laser cutting head (2) so as to receive the slag.

2. The intelligent cutting device for aluminum alloy pipes according to claim 1 is characterized in that: The bearing unit (4) comprises a retaining frame (41) arranged inside the pipe, slide rails (42) are fixedly arranged on both sides of the retaining frame (41), slide rods (43) are arranged on both sides of the slide rails (42), and a bearing plate (44) is arranged on the slide rods (43).

3. The intelligent cutting device for aluminum alloy pipes according to claim 2 is characterized in that: An adjusting screw rod (45) is rotatably arranged in the slide rail (42), the adjusting screw rod (45) is threadedly penetrated through the slide rod (43), and the threads on both sides of the adjusting screw rod (45) are in opposite directions, a connecting rod (46) is arranged between the slide rods (43) on both sides, and the bearing plate (44) is a flexible metal plate, and both sides thereof are fixedly connected to the connecting rods (46) on both sides respectively; A driving motor is arranged at the end of any one of the adjusting screw rods (45), a pulley is arranged outside the two adjusting screw rods (45), a belt is arranged outside the pulley, and the two adjusting screw rods (45) rotate synchronously through the belt drive.

4. The intelligent cutting device for aluminum alloy pipes according to claim 2 is characterized in that: The holding unit (7) comprises a plurality of holding magnets (71) fixedly arranged on both sides of the bottom of the holding frame (41); a support rod (72) is arranged on the machine platform (1); a support frame (73) is arranged at the end of the support rod (72); a plurality of holding magnets (74) are fixedly arranged on the support frame (73); and the holding magnets (71) and the holding magnets (74) repel each other.

5. The intelligent cutting device for aluminum alloy pipes according to claim 2 is characterized in that: The support unit 1 (5) and the support unit 2 (6) each comprise a support block (51), the side walls of the two support blocks (51) are both rotatably provided with connecting shafts (52), the two connecting shafts (52) are respectively connected to the slide rails (42) on both sides, a plurality of slots are provided on the outside of the support block (51), a rotating rod (53) is rotatably provided in the slot via a rotating shaft, and a universal wheel (54) is provided at the end of the rotating rod (53).

6. The intelligent cutting device for aluminum alloy pipes according to claim 5 is characterized in that: A support spring (55) is arranged in the notch of the support block (51) in the support unit 1 (5), and two ends of the support spring (55) are respectively connected to the bottom of the notch and the rotating rod (53); A support spring (55) is also provided at the bottom notch of the support block (51) in the second support unit (6), and the end of the support spring (55) is connected to the rotating rod (53). A magnetic linkage component (8) capable of driving the remaining rotating rods (53) to rotate is provided in the support block (51), and a driving magnetic block (9) capable of driving the magnetic linkage component (8) to move is provided at the laser cutting head (2).

7. The intelligent cutting device for aluminum alloy pipes according to claim 5 is characterized in that: The magnetic linkage assembly (8) comprises a moving rod (81) slidably arranged in a support block (51), the end of the moving rod (81) is wedge-shaped, the top of the support block (51) and the front ends of the rotating rods (53) on both sides are connected with a pull rope (82), the other end of the pull rope (82) is fixedly connected to the moving rod (81), and a top rod (83) is slidably arranged on the support block (51), the bottom end of the top rod (83) abuts against the end wedge of the moving rod (81), and a transmission magnetic block (84) that repel each other with the driving magnetic block (9) is arranged at the top of the top rod (83).

8. The intelligent cutting device for aluminum alloy pipes according to claim 1 is characterized in that: A side plate (10) is fixedly connected to one side of the laser cutting head (2), and the driving magnetic block (9) is fixedly arranged at the end of the side plate (10).

9. The intelligent cutting device for aluminum alloy pipes according to claim 5, characterized in that: The support frame (73) has two limit magnetic blocks (11) fixedly disposed on both sides, and the support blocks (51) on both sides have two limit magnetic blocks (12) fixedly disposed on both sides that repel the limit magnetic block (11).

10. The intelligent cutting device for aluminum alloy pipes according to claim 5, characterized in that: The rotating rod (53) is telescopic, and comprises a main rod (13) rotatably arranged on a supporting block (51), a supporting rod (14) being slidably arranged inside the main rod (13), the universal wheel (54) being arranged at the end of the supporting rod (14), a movable plate (15) being movably arranged inside the main rod (13), a connecting spring (16) being arranged on the movable plate (15), the end of the connecting spring (16) being fixedly connected to the supporting rod (14), an extension plate (17) being fixedly arranged on the side of the movable plate (15), a sliding groove for sliding the extension plate (17) being provided on the main rod (13), a fixed screw rod (18) being rotatably arranged on the main rod (13), and the fixed screw rod (18) being threadedly penetrated through the extension plate (17).

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