Self-cleaning fitness equipment welding method

Abstract

The invention relates to the technical field of pipe fitting welding, in particular to a self-cleaning fitness equipment welding method which comprises the specific steps that a pipe fitting is clamped and attached, a sliding table drives a positioning device to support a material suction pipe to stretch into the pipe fitting, laser welding is conducted, meanwhile, the material suction pipe sucks out welding gas in the pipe, and after welding, the material suction pipe continues to move to scrape dirt and dust on the inner wall of the pipe. By means of the dust collection and physical scraping dual cleaning mode, the problems that much dust exists in the pipe fitting and cleaning is difficult are effectively solved, the positioning device is used for supporting the long-distance material suction pipe, cantilever deformation is avoided, the welding stability is guaranteed, and the welding efficiency is improved. And automatic stripping is achieved, and the beneficial effects of being clean in machining environment and high in automation degree are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipe welding, in particular to a self-cleaning fitness equipment welding method. BACKGROUND

[0002] At present, Chinese patent No. CN106825927B discloses a laser welding device for large length-diameter ratio fuel rod cladding ring welding, which comprises a laser welding head, a servo motor, a driving three-jaw chuck, a gas protection sleeve, a driven three-jaw chuck and a plurality of supporting rollers. The gas protection sleeve comprises a protection sleeve upper half, a protection sleeve lower half, a protection gas input pipeline, a protection lens bracket and a protection lens. The servo motor, the driving three-jaw chuck, the gas protection sleeve, the driven three-jaw chuck and the supporting rollers are sequentially distributed from right to left. The patent discloses a welding device with a general structure. The device uses a chuck to clamp a workpiece and rotates to cooperate with a laser head to perform ring seam welding. The device also involves a basic gas protection structure.

[0003] However, in the actual production process of the above-mentioned prior art and the pipe fittings of the fitness equipment, it is difficult to clean and remove dust from the inside of the pipe fittings. The existing laser welding device mainly focuses on the quality of the welding surface and the removal of external smoke and dust, often ignoring the situation inside the pipe fittings. During the butt welding of the pipe fittings, high-temperature smoke, metal dust and welding slag are generated inside the pipe. These impurities adhere to the inner wall of the pipe fittings, which are difficult to clean and may affect the rust prevention treatment or the spraying quality of the pipe fittings. The existing external air suction device cannot effectively clean the inside of the pipe fittings, and lacks a physical scraping function for the inner wall slag. SUMMARY

[0004] Therefore, in view of the above problems, the present application provides a self-cleaning fitness equipment welding method which solves the above problems.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a self-cleaning fitness equipment welding method using a welding device, which comprises a laser welding table, a first chuck provided on the laser welding table, a horizontal driving platform for driving the chuck to move horizontally, a laser welding head provided on the laser welding table close to the chuck, a second chuck provided on the laser welding table opposite to the position of the first chuck, a first sliding table, a suction device provided on the first sliding table, a second sliding table and a positioning device provided on the top end of the second sliding table for supporting the suction device. The suction device comprises a connecting block, a suction pipe provided at one end of the connecting block and a discharge pipe provided at the other end of the connecting block. The suction pipe and the discharge pipe are connected in communication.

[0006] The welding method comprises the following steps:

[0007] Step one, the pipe is fed through the first chuck to the set position and clamped, the second pipe to be welded is fed through the second chuck and matched with the pipe clamped by the first chuck;

[0008] Step two, the second sliding table drives the positioning device to move close to the pipe, the first sliding table drives the suction pipe to move to the pipe through the connecting block and the suction pipe is inserted into the pipe under the support of the positioning device;

[0009] Step three, the laser welding head welds the matching surface of the two pipes, the first chuck and the second chuck synchronously drive the pipe to rotate, and the suction pipe is located in the pipe to suck out the gas generated during welding;

[0010] Step four, after welding, the suction pipe continues to move and passes through the inner wall of the pipe to scrape off the dirt and welding dust attached to the inner wall of the pipe, the length of the suction pipe passing through is greater than the welding length of the pipe, then the suction pipe moves to the right, and the scraped dirt and dust are discharged through the suction pipe and the discharge pipe by the external waste suction device;

[0011] Step five, the suction pipe moves reversely to reset, the positioning device blocks the pipe outside the suction pipe to separate the pipe from the suction pipe.

[0012] Further, a connecting pipe is connected between the suction pipe and the discharge pipe, the connecting pipe includes a fixed circular pipe, a sleeve and a mounting pipe, one side of the fixed circular pipe passes through the through hole in the connecting block, one side of the fixed circular pipe is detachably arranged in the connecting block, the sleeve is arranged on the side of the fixed circular pipe away from the connecting block, the mounting pipe is detachably arranged on the side of the sleeve away from the connecting block, and the outer side of the mounting pipe is detachably connected with the discharge pipe.

[0013] Further, two threaded holes are arranged on the side of the fixed circular pipe close to the suction pipe, the threaded holes on the outer side of the fixed circular pipe are connected with the suction pipe through connecting bolts, a clamp is arranged on the outer side of the discharge pipe, and the outer side of the mounting pipe is connected with the discharge pipe through the clamp.

[0014] Further, the end face of the suction pipe away from the discharge pipe is an inclined face, and the inclination angle of the inclined face from left to right and from bottom to top is 20-50.

[0015] Further, the positioning device includes a connecting piece and positioning blocks, the connecting piece is detachably arranged on the first sliding table, the positioning blocks are arranged on the transverse two sides of the connecting piece, the positioning blocks are provided with holes for the suction pipe to pass through, and the positioning blocks and the suction pipe are coaxially arranged.

[0016] Further, the first sliding table top end face is provided with a spring assembly, the spring assembly comprises a fixed plate detachably arranged on the first sliding table, a movable rod hingedly arranged on the fixed plate, and a spring detachably arranged at the front end of the movable rod, the movable rod is inclined from back to front and from top to bottom, and the bottom of the spring is attached to the pipe.

[0017] By adopting the foregoing technical scheme, the self-cleaning fitness equipment welding method has the following beneficial effects:

[0018] The self-cleaning fitness equipment welding method, by virtue of the setting of the suction device, the suction pipe is arranged in the pipe during the welding process, so that the high-temperature smoke and metal dust generated during welding can be sucked out in the first time, thereby preventing the spread or adhesion of the high-temperature smoke and metal dust in the pipe. After the welding is completed, the hard characteristic of the suction pipe and the special inclined port design are utilized to physically scrape the inner side wall of the pipe by relative movement, so that the welding slag and adhering dirt are effectively removed. The double cleaning mode of suction and scraping solves the problem of much dust in the pipe during the pipe processing and welding process and the difficulty in cleaning, and provides a clean basis for the subsequent rust prevention or spraying process.

[0019] The positioning device is arranged to assist in supporting the suction pipe, the second sliding table drives the positioning device to move, thereby providing a fulcrum for the slender suction pipe inserted into the deep part of the pipe, effectively avoiding the bending deformation or vibration of the suction pipe due to the too long cantilever, and ensuring the balance and stability during the welding and scraping processes. Meanwhile, the positioning block in the positioning device plays a blocking role when the suction pipe is reset, so as to force the pipe and the suction pipe to automatically separate, and the first chuck output is combined to realize the automatic falling of the pipe, without manual intervention, thereby greatly improving the degree of automation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the present application;

[0021] Figure 2 is a partial structural schematic diagram of the present application;

[0022] Figure 3 is a partial structural schematic diagram of the present application in the use state of the suction device and the positioning device;

[0023] Figure 4 is a structural schematic diagram of the present application in the use state;

[0024] Figure 5 is a structural schematic diagram of the present application in the use state of the welding;

[0025] Figure 6 is a front view schematic diagram of the first chuck structure of the present application;

[0026] Figure 7 is a right view schematic diagram of the first chuck structure of the present application;

[0027] Figure 8 is a first chuck local explosion state structure schematic diagram of the present application.

[0028] In the figure: 1, laser welding station; 2, first sliding table; 3, suction device; 4, second sliding table; 5, positioning device; 6, spring assembly; 7, universal elbow; 8, travel switch; 31, connecting block; 311, through hole; 32, suction pipe; 33, discharge pipe; 34, connecting pipe fitting; 3a, fixed round pipe; 3b, sleeve; 3c, mounting pipe; 3d, threaded hole; 3e, clamp; 51, connecting piece; 52, positioning block; 521, opening; 61, fixed plate; 62, movable rod; 63, spring; 1a, first chuck; 1b, transverse driving platform; 1c, laser welding head; 1d, second chuck;

[0029] 101, base; 102, rotating disc; 103, gear ring; 104, driving gear; 105, first motor; 106, first clamping mechanism; 107, partition disc; 108, second clamping mechanism; 109, first moving plate; 110, second moving plate; 111, first rack; 112, guide gear; 113, second rack; 114, lead screw; 115, sliding block; 116, second motor; 117, roller; 118, driving device. DETAILED DESCRIPTION

[0030] The present application will be further described in conjunction with the drawings and specific embodiments.

[0031] REFERENCE Figures 1 to 8The embodiment provides a self-cleaning fitness equipment welding method, and a welding device is used, the device comprises a laser welding table 1, a first chuck 1a arranged on the laser welding table 1, a transverse driving platform 1b used for driving the chuck to move transversely, a laser welding head 1c arranged on the laser welding table 1 and close to the chuck, a second chuck 1d arranged on the laser welding table 1 and opposite the first chuck 1a, a first sliding table 2 detachably arranged at the front end of the laser welding table 1, a material suction device 3 arranged on the first sliding table 2, a second sliding table 4 arranged at the top end of the laser welding table 1 and a positioning device 5 used for supporting the material suction device 3, the positioning device 5 is arranged at the top end of the second sliding table 4, the material suction device 3 comprises a connecting block 31 detachably arranged on the second sliding table 4, a material suction pipe 32 and a material discharge pipe 33, the first sliding table 2 and the second sliding table 4 can be ball screw driving linear modules or other sliding tables with equivalent functions, the material suction pipe 32 is arranged on one end face of the connecting block 31 close to the positioning device 5, the material suction pipe 32 is preferably a hard metal pipe, the material suction pipe 32 is in a circular or rectangular shape or other shapes, the material discharge pipe 33 is arranged on one end face of the connecting block 31 away from the material suction pipe 32 and is detachably arranged on the connecting block 31, the material discharge pipe is preferably a corrugated flexible pipe and can also be a mesh pipe or other pipes with equivalent functions, a through hole 311 is arranged in the connecting block 31, the material suction pipe 32 and the through hole 311 are both in communication with the material discharge pipe 33, the material discharge pipe 33 can be connected with an external waste suction device, for sucking the waste in the pipe, the pipe is fed to a set length position through the first chuck to the right end, after completion, the first chuck clamps the pipe, then the pipe to be welded is passed through the second chuck and is attached to the pipe clamped by the first chuck;

[0032] The welding method comprises the following steps:

[0033] Step one, the pipe is clamped after being fed to a set position through the first chuck 1a, the second pipe to be welded is passed through the second chuck 1d and is attached to the pipe clamped by the first chuck 1a;

[0034] Step two, the positioning device 5 is moved to a position close to the pipe by the second sliding table 4, the material suction pipe 32 is moved to the pipe and passes through the positioning device 5 by the first sliding table 2 through the connecting block 31, and the material suction pipe 32 extends into the pipe under the support of the positioning device 5;

[0035] Step three, the abutting surface of the two pipes is welded by the laser welding head 1c, and the first chuck 1a and the second chuck 1d synchronously drive the pipe to rotate, and the material suction pipe 32 in the pipe sucks out the gas generated in the welding process;

[0036] Step four, after welding, the suction pipe 32 continues to move and passes through the inner side wall of the pipe, and the dirt and welding dust attached to the inner side wall of the pipe are scraped off. The suction pipe 32 passes through a length greater than the welding length of the pipe, and then the suction pipe 32 moves to the right, and the scraped dirt and dust are discharged through the suction pipe 32 and the discharge pipe 33 by the external waste suction device.

[0037] Step five, the suction pipe 32 moves reversely and resets, and the positioning device 5 blocks the pipe on the outer side of the suction pipe 32, so that the pipe is separated from the suction pipe 32.

[0038] The first sliding table 2 drives the suction pipe 32 to move to one end of the pipe through the connecting block 31, and the suction pipe 32 moves to the inside of the pipe. Then the laser welding head 1c welds the two pipe fitting surfaces. The first chuck 1a and the second chuck 1d synchronously drive the two pipes to rotate. The suction pipe 32 sucks the welding gas in the pipe to the outside during the welding process. After the welding is completed, the suction pipe 32 passes through the inner side wall of the pipe, and the dirt attached to the inner side wall of the pipe and the dust generated at the welding position of the two pipes are scraped and sucked. The length of the suction pipe 32 passing through the pipe is greater than the welding length of the pipe. After the suction pipe 32 passes through, it moves to the right end. At the same time, the scraped dirt in the pipe and the dirt attached to the inner wall are sucked out of the suction pipe 32 by the external waste suction device and discharged from the discharge pipe 33 into the external waste suction device. The suction pipe 32 moves to the right side of the pipe. The positioning device 5 supports the suction pipe 32, so that the suction pipe 32 supports the pipe close to the first chuck end. During the welding process, the pipe is balanced and stable. The laser pipe welding head generates cutting dust and debris during the welding of the pipe. The dust in the processing environment is sucked and removed by the suction pipe 32, which achieves the beneficial effect of less dust and dirt in the processing process and solves the problem of too much dust in the steel pipe processing and welding process.

[0039] A connecting pipe 34 is connected between the suction pipe 32 and the discharge pipe 33. The connecting pipe 34 includes a fixed circular pipe 3a, a sleeve 3b and a mounting pipe 3c, as shown in Figure 1 The fixed circular pipe 3a passes through the through hole 311 in the connecting block 31 on one side. The fixed circular pipe 3a is detachably arranged in the connecting block 31 on one side. The sleeve 3b is arranged on the side away from the connecting block 31 of the fixed circular pipe 3a. The sleeve 3b is threadedly connected or inserted or connected in other forms with the fixed circular pipe 3a. The mounting pipe 3c is detachably arranged on the side away from the connecting block 31 of the sleeve 3b. The mounting pipe 3c is detachably connected to the outer side of the discharge pipe 33.

[0040] The sleeve 3b is sleeved on the right end of the fixed circular pipe 3a, and the mounting pipe 3c is sleeved on the right end of the sleeve 3b. During installation, the fixed circular pipe 3a is fixed in the through hole 311 of the connecting block 31, the discharge pipe 33 is fixed on the right end of the mounting pipe 3c, and the connecting pipe 34 is detachably connected to the connecting block 31 for use. When the connecting pipe 34 is damaged, it can be easily replaced and maintained. The fixed circular pipe 3a and the mounting pipe 3c are well adapted to the suction pipe 32 and the discharge pipe 33, and are tightly sealed during connection. The suction pipe 32 is a hard pipe, which is easy to pass through the pipe fitting. The discharge pipe 33 is a soft pipe or a telescopic hose, which is easy to contract and bend when moving.

[0041] The fixed circular pipe 3a is provided with two threaded holes 3d on the side close to the suction pipe 32. The threaded holes 3d on the outer side of the fixed circular pipe 3a are connected to the suction pipe 32 by connecting bolts, or are connected in a threaded or other connection mode. The discharge pipe 33 is provided with a clamp 3e on the outer side. The mounting pipe 3c is connected to the discharge pipe 33 through the clamp 3e. The clamp mentioned in this application has been disclosed in the authorized and published invention case "worm drive type clamp" (CN201820109988.9), and the structure and principle of the clamp have been disclosed. Therefore, this application will not be repeated.

[0042] The suction pipe 32 is fixed and attached by bolts passing through the threaded holes 3d on the fixed circular pipe 3a. When the suction pipe 32 or the fixed circular pipe 3a needs to be disassembled, the bolts in the threaded holes 3d can be removed to disassemble the suction pipe 32 or the fixed circular pipe 3a. This can achieve the benefit of quickly disassembling the suction pipe 32 or the fixed circular pipe 3a. The discharge pipe 33 is connected to the mounting pipe 3c through the clamp 3e, which can achieve the benefit of quickly disassembling the discharge pipe 33. The clamp 3e has the advantages of low procurement cost and good durability.

[0043] The end face of the suction pipe 32 away from the discharge pipe 33 is an inclined face. The inclination angle of the inclined face from left to right and from bottom to top is 20-50. The area of the inclined face is larger than that of the vertical plane, and the adsorption effect on the inner wall of the pipe fitting is good.

[0044] The positioning device 5 includes a connecting piece 51 and a positioning block 52. The connecting piece 51 is detachably arranged on the first sliding table 2. The positioning block 52 is arranged on the transverse sides of the connecting piece 51. The positioning block 52 is provided with an opening 521 for the suction pipe 32 to pass through. The positioning block 52 and the suction pipe 32 are coaxially arranged.

[0045] The second sliding table 4 drives the positioning device 5 to move close to the pipe, and then the suction pipe 32 passes through the hole 521 on the positioning block 52, and then continues to pass through the inner wall of the pipe on one side. The second sliding table 4 supports the end of the suction pipe 32 close to the pipe, which can avoid the problem that the suction pipe 32 is easily bent and deformed when the long suction pipe 32 supports the end of the pipe during welding. At the same time, the suction pipe 32 moves to the hole 521 in the positioning block 52, and the suction pipe 32 is separated from the inner wall of the pipe. The positioning block 52 blocks the pipe on the outside of the suction pipe 32, so that the pipe is easily separated from the suction pipe 32 and avoids moving the suction pipe 32 to move the pipe.

[0046] The first sliding table 2 is provided with a spring assembly 6 at the top end surface, the spring assembly 6 includes a fixed plate 61 detachably provided on the first sliding table 2, an activity rod 62 hingedly provided on the fixed plate 61, and a spring 63 detachably provided on the front end of the activity rod 62. The activity rod 62 is inclined from back to front and from top to bottom, and the spring 63 is in contact with the pipe at the bottom.

[0047] Because the activity rod 62 is in an inclined state, the spring 63 provided on the activity rod 62 will press the pipe. When the pipe is welded, the suction pipe 32 moves to the right, the first chuck leaves the pipe, and under the pressing of the spring 63, the pipe with poor welding quality will fall off, and the pipe is easily separated from the suction pipe 32, which is beneficial to the preliminary arrangement and selection of the welded pipe.

[0048] The positioning device 5 is provided with a universal curved pipe 7. When the pipe is welded on the outside, the suction hole of the universal curved pipe 7 can assist in sucking the dust generated by the outside welding of the pipe, reducing the generation of external dust during processing.

[0049] The first chuck 1a comprises a base 101 arranged on the transverse driving platform 1b, a rotating disc 102 rotatably arranged outside the base 101, a gear ring 103 arranged outside the rotating disc 102, a driving gear 104 arranged below the gear ring 103, a first motor 105 for driving the driving gear 104 to rotate, a first clamping mechanism 106 arranged at a longitudinal position on the rotating disc 102, a partition disc 107 arranged at a side of the rotating disc 102, and a second clamping mechanism 108 arranged at a transverse position on the partition disc 107, wherein the second clamping mechanism 108 comprises first and second moving plates 109 and 110 slidingly arranged at two transverse sides of the partition disc 107, first racks 111 arranged at upper and lower sides of the first moving plate 109, a guide gear 112 rotatably arranged on the partition disc 107 and engaged with the first racks 111, second racks 113 arranged on the second moving plate 110 and engaged with the guide gear 112, a lead screw 114 rotatably arranged on the partition disc 107, a sliding block 115 arranged at a right side of the second moving plate 110 and screwed with the lead screw 114, a second motor 116 for driving the lead screw 114 to rotate, rollers 117 rotatably arranged on adjacent surfaces of the first and second moving plates 109 and 110, and a driving device 118 for driving the rollers 117 to rotate.

[0050] In use, the pipe passes through the rotating disc 102 and the partition disc 107, and after completion, the second motor 116 drives the lead screw 114 to rotate, the lead screw 114 drives the second moving plate 110 to move towards the pipe through the sliding block 115, the second moving plate 110 drives the second racks 113 to synchronously move, the second racks 113 drive the first racks 111 to move through the guide gear 112, which synchronously drives the first moving plate 109 to move towards the pipe, and the second clamping mechanism 108 also synchronously clamps the pipe; the first clamping mechanism 106 has the same structure and principle as the second clamping mechanism 108, and will not be described here.

[0051] When the second chuck 1d rotates, the first motor 105 drives the gear ring 103 to rotate through the driving gear 104, so that the rotating disc 102 synchronously rotates with the second chuck 1d, which is beneficial to cooperation with the second chuck 1d; when the pipe to be welded is a square pipe or a rectangular pipe with inconsistent length and width, the first clamping mechanism 106 and the second clamping mechanism 108 can be independently adjusted, the first clamping mechanism 106 and the second clamping mechanism 108 clamp the wide side and the long side of the rectangular pipe respectively, which is convenient for clamping the square pipe or the rectangular pipe with inconsistent length and width, the driving device 118 drives the rollers 117 to rotate after welding, which can drive the welded pipe to move out of the first chuck 1a, which is convenient for automatic feeding in cooperation with the automatic feeding mechanism, avoids the welded pipe in the first chuck 1a from blocking the pipe feeding of the automatic feeding mechanism, and does not need manual removal, thereby reducing labor cost and improving compatibility.

[0052] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the technical features indicated. Thus, the features defined with "first", "second", etc. can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0053] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0055] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0056] Although the present application is specifically shown and described in connection with preferred embodiments, those skilled in the art should understand that various changes in form and details can be made to the present application without departing from the spirit and scope of the present application defined by the appended claims, and all such changes are within the protection scope of the present application.

Claims

1. A self-cleaning fitness equipment welding method using a welding device, the device comprising a laser welding table (1), a first chuck (1a) provided on the laser welding table (1), a transverse driving platform (1b) for driving the chuck to move transversely, a laser welding head (1c) provided on the laser welding table (1) close to the chuck, a second chuck (1d) provided on the laser welding table (1) opposite the first chuck (1a), a first sliding table (2), a suction device (3) provided on the first sliding table (2), a second sliding table (4), and a positioning device (5) provided at the top end of the second sliding table (4) for supporting the suction device (3), the suction device (3) comprising a connecting block (31), a suction pipe (32) provided at one end of the connecting block (31), and a discharge pipe (33) provided at the other end of the connecting block (31), the suction pipe (32) and the discharge pipe (33) being in communication. The welding method comprises the following steps: Step one: After the pipe passes through the first chuck (1a) and reaches the set position, it is clamped, and the second pipe to be welded passes through the second chuck (1d) and is attached to the pipe clamped by the first chuck (1a); Step two: The second sliding table (4) moves the positioning device (5) to a position close to the pipe, and the first sliding table (2) moves the suction pipe (32) towards the pipe through the connecting block (31) and passes through the positioning device (5), and the suction pipe (32) extends into the pipe under the support of the positioning device (5); Step three: The laser welding head (1c) welds the attached surface of the two pipes, and the first chuck (1a) and the second chuck (1d) synchronously drive the pipe to rotate, and in the welding process, the suction pipe (32) located in the pipe absorbs the gas generated during welding; Step four: After welding is completed, the suction pipe (32) continues to move and passes through the inner wall of the pipe, and the dirt and welding dust attached to the inner wall of the pipe are scraped off, the length of the suction pipe (32) passing through is greater than the welding length of the pipe, and then the suction pipe (32) moves to the right, and the scraped dirt and dust are discharged through the suction pipe (32) and the discharge pipe (33) by the external waste suction device; Step five: The suction pipe (32) moves reversely to reset, and the positioning device (5) blocks the pipe outside the suction pipe (32) to separate the pipe from the suction pipe (32).

2. A self-cleaning fitness equipment welding method as defined in claim 1, wherein: A connecting pipe (34) is provided between the suction pipe (32) and the discharge pipe (33), the connecting pipe (34) comprises a fixed circular pipe (3a), a sleeve (3b), and a mounting pipe (3c), one side of the fixed circular pipe (3a) passes through the through hole (311) in the connecting block (31), the fixed circular pipe (3a) is detachably provided in the connecting block (31), the sleeve (3b) is provided on the side of the fixed circular pipe (3a) away from the connecting block (31), the mounting pipe (3c) is detachably provided on the side of the sleeve (3b) away from the connecting block (31), and the mounting pipe (3c) is detachably connected with the discharge pipe (33) on the outside.

3. A self-cleaning method of welding fitness equipment according to claim 1, characterized in that: The fixed circular pipe (3a) is provided with two threaded holes (3d) on the side close to the suction pipe (32), the threaded holes (3d) on the outer side of the fixed circular pipe (3a) are connected with the suction pipe (32) through connecting bolts, the outer side of the discharge pipe (33) is provided with a clamp (3e), and the outer side of the mounting pipe (3c) and the discharge pipe (33) are connected through the clamp (3e).

4. A self-cleaning method of welding fitness equipment according to claim 2, characterized in that: The end face of the suction pipe (32) away from the discharge pipe (33) is an inclined surface, and the inclined angle of the inclined surface from left to right and from bottom to top is 20-50.

5. A self-cleaning method of welding fitness equipment according to claim 1, characterized in that: The positioning device (5) comprises a connecting piece (51) and a positioning block (52), the connecting piece (51) is detachably arranged on the first sliding table (2), the positioning block (52) is arranged on the transverse two sides of the connecting piece (51), the positioning block (52) is provided with an opening (521) for the suction pipe (32) to pass through, and the positioning block (52) and the suction pipe (32) are coaxially arranged.

6. A self-cleaning method of welding fitness equipment according to claim 1, characterized in that: The first sliding table (2) is provided with a spring assembly (6) on the top end face, the spring assembly (6) comprises a fixed plate (61) which is detachably arranged on the first sliding table (2), a movable rod (62) which is hingedly arranged on the fixed plate (61), and a spring (63) which is detachably arranged on the front end of the movable rod (62), the movable rod (62) is inclined from back to front and from top to bottom, and the spring (63) is in close contact with the pipe fitting at the bottom.

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