Automatic welding device and method for large precast pile

Abstract

The invention discloses an automatic welding device and method for a large precast pile, and belongs to the field of welding equipment. An automatic welding device for a large precast pile comprises a detachable fixing ring, arc-shaped plates which are symmetrically distributed are installed on the surface of the fixing ring, a welding gun is arranged on one side of each arc-shaped plate, and a walking mechanism arranged on the arc-shaped plates surrounds the surfaces of the arc-shaped plates and is used for driving the welding gun to walk and conduct welding operation. A processing assembly is arranged on the walking mechanism, and the walking mechanism drives the processing assembly to move when walking. Through mutual cooperation of the walking mechanism, the processing assembly and the gas collecting assembly, when surrounding type welding operation is carried out, pre-cleaning can be carried out on a to-be-walking stroke area, splashed welding slag and dust can be processed, the phenomenon of walking deviation or faults of the device during welding operation is effectively avoided, and the welding quality is improved. And the operation stability and the welding precision of the device are improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, and in particular to an automatic welding device and method for large prefabricated piles. Background Art

[0002] Traditional prefabricated pile connection methods mostly use manual welding, which is not only labor-intensive, but also inefficient, and it is difficult to ensure the consistency and stability of welding quality. With the expansion of engineering project scale and the improvement of construction requirements, traditional manual welding methods can no longer meet the needs of modern engineering construction.

[0003] The patent application number is CN202111466556.6, and the application date is 2021-12-03. It discloses an automatic welding pile connection device for prefabricated pipe piles and a method of using the same, wherein the device includes an annular track, which is composed of several rectangular blocks. The annular track is fixedly installed on the prefabricated pipe piles. A moving mechanism is installed on the annular track, and a welding gun is installed at the bottom of the moving mechanism. The welding wire installed on the welding gun is aligned with the weld. The annular track includes a rectangular block, a groove is provided on one side of the rectangular block, and a protrusion is provided on the other side of the rectangular block. Through hole two and through hole one are respectively provided on the rectangular block and the protrusion, and any two rectangular blocks are connected by pins installed in through hole two and through hole one.

[0004] Although the above patent improves the welding efficiency of the device and is suitable for the welding of prefabricated pipe piles with different outer diameters, considering that the operation is carried out in a construction site environment and there is a lot of dust pollution, during the pipe pile welding operation, the parts welded around the pile body are easily affected by dust or welding slag splashed during welding, which may cause the device to easily deviate or fail to the line during subsequent welding, thereby reducing the welding accuracy of the device. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that during the pipe pile welding operation, the parts welded around the pile body are easily affected by dust or welding slag splashed during welding, which causes the device to easily deviate or fail under the line during subsequent welding, and to propose an automatic welding device and method for large prefabricated piles.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A large-scale prefabricated pile automatic welding device comprises a detachable fixing ring, a symmetrically distributed arc plate is installed on the surface of the fixing ring, a welding gun is arranged on one side of the arc plate, and a walking mechanism is arranged on the arc plate, which surrounds the surface of the arc plate and is used to drive the welding gun to move and perform welding operations; a processing component is arranged on the walking mechanism, which drives the processing component to move when the walking mechanism moves, so as to clean the front of the walking area on the arc plate; an air collecting component is arranged on the walking mechanism, which drives the air collecting component to run simultaneously when the walking mechanism runs, so as to generate airflow to perform self-cleaning treatment on the processing component.

[0007] Preferably, the ends of the two fixing rings are rotatably connected via a pin, and the other ends of the two fixing rings are fixedly mounted on the pipe pile via a first bolt.

[0008] Preferably, the walking mechanism includes a T-shaped groove opened on the arc plate, the interior of the T-shaped groove is slidably connected with a T-shaped slider, the top of the T-shaped slider is fixed with an L-shaped block, one end of the L-shaped block is fixed with a mounting seat, and a rotating part is provided on the mounting seat.

[0009] Preferably, the rotating member includes a driving part installed on a mounting seat, the output end of the driving part passes through the mounting seat and is fixed with a rotating gear, the surface of the rotating gear is meshed with a tooth groove, the tooth groove is opened on the surface of the arc plate, and the other end of the mounting seat is fixedly connected to the welding gun.

[0010] Preferably, the processing component includes a connecting shaft fixed at the axis of the rotating gear, a synchronous belt is provided on the surface of the connecting shaft, a rotating shaft is transmitted on the surface of the synchronous belt, one end of the rotating shaft is rotatably connected to a support plate through a bearing, one end of the support plate is fixedly connected to the welding gun, a cleaning brush is installed on the surface of the rotating shaft, and the cleaning brush is in contact with the tooth groove.

[0011] Preferably, the gas collecting assembly includes a cam fixed at the end of the connecting shaft, the surface of the cam fits a limiting block, a sliding rod is fixed to one side of the limiting block, a piston is fixed to the end of the sliding rod, the piston is slidably connected in a connecting cylinder, the connecting cylinder is fixedly connected to a support plate through a fixing plate, a tension spring is fixed between the piston and the connecting cylinder, and the tension spring is sleeved on the surface of the sliding rod.

[0012] Preferably, an air supply pipe is fixed to one end of the connecting tube, one end of the air supply pipe passes through the baffle and is connected to the nozzle, the nozzle is installed on one side surface of the baffle, an air intake pipe is provided at one end of the connecting tube, and a one-way valve is installed between the air intake pipe, the air supply pipe and the connecting tube.

[0013] Preferably, an inclined hole is provided at one end of the connecting tube, the inclined hole is communicated with a rod cavity in the connecting tube, and the inclined hole points to the connection between the connecting shaft and the cam.

[0014] Preferably, the two arc-shaped plates are spliced ​​into a circular ring, a support block is fixed on the surface of the arc-shaped plate, a second bolt is fixed on the outer wall of the fixing ring, and the support block and the second bolt are fixed together by screws.

[0015] A method for using a large prefabricated pile automatic welding device mainly comprises the following steps: Step A: The staff at the construction site connects the pipe pile to be welded with another pipe pile through a fixing fixture. Before the welding operation, a fixed ring can be set on the surface of the pipe pile, and then an arc plate is installed on the surface of the fixed ring, and the welding gun set on the arc plate is assembled with the fixed ring; Step B: During welding, a walking mechanism is provided on the arc plate, and the welding gun is driven to move around the pile body by starting the walking mechanism. During this process, one end of the welding gun is close to the joint of the two pile bodies for welding operation. When the walking mechanism is moving, the processing component is driven to run synchronously by the walking mechanism. The processing component can be used to clean the welding slag and dust splashed in the walking area of ​​the walking mechanism. When the walking mechanism is moving, it can also drive the gas collecting component to run synchronously, so that the airflow generated by the operation of the gas collecting component is transported to the processing component, and the cleaned parts at the processing component can be blown for self-cleaning.

[0016] Compared with the prior art, the present invention provides a large prefabricated pile automatic welding device and method, which has the following beneficial effects: 1. This large prefabricated pile automatic welding device has a traveling mechanism. During the welding operation, the traveling mechanism drives the welding gun to circle around the pile body for welding construction operations, eliminating the trouble of manual operation and making the travel more stable.

[0017] 2. This large-scale prefabricated pile automatic welding device is equipped with a processing component on the traveling mechanism. When the traveling mechanism drives the processing component to run synchronously during the welding operation, the travel area on the surface of the arc plate is cleaned to remove the fallen dust and splashed welding slag, thereby further improving the stability of the device operation and effectively improving the accuracy of the welding operation.

[0018] 3. This large-scale prefabricated pile automatic welding device is also provided with an air collecting component on the traveling mechanism. When the traveling mechanism is in operation, it can also drive the air collecting component to run synchronously. The generated airflow is transported to the processing component, and the cleaned parts at the processing component can be blown for self-cleaning, saving maintenance costs. At the same time, the blown airflow can be used to cool them and extend the service life of the parts.

[0019] The parts not involved in the device are the same as the prior art or can be implemented by using the prior art. The present invention sets a walking mechanism, a processing component and a gas collecting component to cooperate with each other. When performing a circular welding operation, the travel area to be walked can be pre-cleaned, and the splashing welding slag and dust can be processed, thereby effectively avoiding the occurrence of device walking deviation or malfunction during the welding operation, thereby improving the stability of the device operation and the accuracy of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of an automatic welding device for large prefabricated piles proposed by the present invention; Figure 2 This is a schematic diagram of the top view of a large prefabricated pile automatic welding device proposed by the present invention; Figure 3 The present invention proposes Figure 2 Schematic diagram of the AA section structure; Figure 4 The present invention proposes Figure 3 A schematic diagram of the enlarged structure of the middle A area; Figure 5 This is a schematic diagram of a partial three-dimensional structure of a walking mechanism in a large prefabricated pile automatic welding device proposed by the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of a large prefabricated pile automatic welding device proposed by the present invention when viewed from above; Figure 7 The present invention proposes Figure 6 Schematic diagram of the enlarged structure of the middle B area; Figure 8 This is a front view structural schematic diagram of a large prefabricated pile automatic welding device proposed by the present invention.

[0021] In the figure: 1. fixing ring; 10. first bolt; 11. pin; 2. arc plate; 21. support block; 22. fixing block; 23. second bolt; 3. welding gun; 4. walking mechanism; 41. L-shaped block; 42. T-shaped slider; 43. T-shaped slide groove; 44. mounting seat; 45. driving part; 46. rotating gear; 47. tooth groove; 5. processing assembly; 51. connecting shaft; 52. synchronous belt; 53. rotating shaft; 54. cleaning brush; 55. support plate; 56. baffle; 6. gas collecting assembly; 61. cam; 62. limit block; 63. slide rod; 64. piston; 65. connecting tube; 66. gas pipe; 67. tension spring; 68. intake pipe; 69. nozzle. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] In the description of the present invention, the term "multiple" refers to two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. The terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0024] In the description of this specification, the description of the terms "one embodiment", "some implementations", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation 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 one or more embodiments or examples in a suitable manner.

[0025] Reference Figure 1-Figure 8 A large-scale prefabricated pile automatic welding device comprises a detachable fixing ring 1, a symmetrically distributed arc plate 2 is installed on the surface of the fixing ring 1, a welding gun 3 is arranged on one side of the arc plate 2, and a walking mechanism 4 is arranged on the arc plate 2, which is used to drive the welding gun 3 to walk and weld around the surface of the arc plate 2; a processing component 5 is arranged on the walking mechanism 4, which drives the processing component 5 to move when the walking mechanism 4 moves, so as to clean the front of the walking area on the arc plate 2; a gas collecting component 6 is arranged on the walking mechanism 4, which drives the gas collecting component 6 to run when the walking mechanism 4 runs, and generates airflow to perform self-cleaning treatment on the processing component 5.

[0026] In this solution, the staff connects the pipe pile to be welded with another pipe pile through a fixing fixture at the construction site. Before the welding operation, the fixed ring 1 can be set on the surface of the pipe pile, and then the arc plate 2 is installed on the surface of the fixed ring 1, and the welding gun 3 set on the arc plate 2 is assembled with the fixed ring 1, so as to facilitate the subsequent welding operation. During welding, a walking mechanism 4 is provided on the arc plate 2, and the welding gun 3 is driven to walk around the pile body by starting the walking mechanism 4. In this process, one end of the welding gun 3 is close to the joint seam of the two pile bodies for welding operation. When the walking mechanism 4 is moving, the processing group is driven by the walking mechanism 4. The processing component 5 operates synchronously, and the processing component 5 can be used to clean the splashing welding slag and dust in the walking area of ​​the walking mechanism 4, so as to ensure the smooth operation of the walking mechanism 4 and avoid the occurrence of malfunctions and deviations. When the walking mechanism 4 is walking, it can also drive the gas collecting component 6 to operate synchronously, so that the airflow generated by the operation of the gas collecting component 6 is transported to the processing component 5, and the cleaned parts at the processing component 5 can be blown for self-cleaning, which saves maintenance costs. At the same time, the blown airflow can be used to cool them and extend the service life of the parts. On the whole, the coordinated operation of multiple components can effectively improve the stability of the device operation and the accuracy of welding.

[0027] In a preferred embodiment, referring to Figure 2 The ends of the two fixing rings 1 are rotatably connected by a pin shaft 11, and the other ends of the two fixing rings 1 are fixedly mounted on the pipe pile by a first bolt 10. The two arc plates 2 are spliced ​​into a circular ring shape, and a support block 21 is fixed on the surface of the arc plate 2. The outer wall of the fixing ring 1 is fixed with a second bolt 23, and the support block 21 and the second bolt 23 are fixed together by screws.

[0028] In the above scheme, during the welding preparation stage, two fixing rings 1 are installed on the surface of the pile body. The fixing rings 1 fit the surface of the pile body and are locked and fixed by the first bolts 10. After the fixing rings 1 are installed, the arc plate 2 is then installed on the fixing rings 1. The two arc plates 2 are spliced ​​into a complete circular ring shape, which is tightened and fixed by the second bolts 23 through the cooperation of the support block 21 and the fixing block 22. With such a structure, disassembly and assembly are more convenient, installation is convenient, and the work efficiency of the staff is effectively improved.

[0029] In a preferred embodiment, referring to Figure 4 and Figure 5The walking mechanism 4 includes a T-shaped slide groove 43 provided on the arc plate 2, a T-shaped slider 42 is slidably connected inside the T-shaped slide groove 43, an L-shaped block 41 is fixed on the top of the T-shaped slider 42, a mounting seat 44 is fixed at one end of the L-shaped block 41, a rotating member is arranged on the mounting seat 44, and the rotating member includes a driving part 45 installed on the mounting seat 44, a rotating gear 46 is fixed on the output end of the driving part 45 through the mounting seat 44, a tooth groove 47 is meshed on the surface of the rotating gear 46, and the tooth groove 47 is provided on the surface of the arc plate 2, and the other end of the mounting seat 44 is fixedly connected to the welding gun 3.

[0030] In the above scheme, the driving part 45 is replaced by a reduction motor drive. When welding is performed, the driving part 45 is started to drive the rotating gear 46 to rotate, the rotating gear 46 is engaged with the tooth groove 47, and the T-shaped slider 42 at one end of the L-shaped block 41 slides inside the T-shaped slide groove 43, so that the welding gun 3 can be driven to weld around the surface of the arc plate 2. Through this scheme, the trouble of manual welding operation in outdoor environment is saved, the labor intensity is saved, and the consistency and stability of welding quality are effectively improved.

[0031] It should be noted that in order to improve the stability of the device operation, in a preferred solution, L-shaped blocks 41, T-shaped sliders 42 and T-shaped grooves 43 can be symmetrically arranged at both ends of the arc plate 2, and then the two L-shaped blocks 41 are fixedly connected to the welding gun 3, so that after the rotating gear 46 is engaged with the tooth groove 47, the welding gun 3 moves more stably.

[0032] In a preferred embodiment, referring to Figure 5 The processing component 5 includes a connecting shaft 51 fixed at the axis of the rotating gear 46, a synchronous belt 52 is provided on the surface of the connecting shaft 51, a rotating shaft 53 is driven on the surface of the synchronous belt 52, one end of the rotating shaft 53 is rotatably connected to a support plate 55 through a bearing, one end of the support plate 55 is fixedly connected to the welding gun 3, a cleaning brush 54 is installed on the surface of the rotating shaft 53, and the cleaning brush 54 is in contact with the tooth groove 47.

[0033] In the above scheme, the rotating gear 46 drives the connecting shaft 51 to rotate, and then drives the cleaning brush 54 to rotate synchronously. The cleaning brush 54 contacts the tooth groove 47, and can clean the dust and welding slag in the depression of the tooth groove 47 to avoid staying in the tooth groove 47 and affecting the normal operation of the walking mechanism 4. Therefore, with the cooperation of the walking mechanism 4 and the processing component 5, during the automatic walking welding process, the travel area can be pre-cleaned in advance, thereby reducing the occurrence of device failure during welding. When the cleaning brush 54 is cleaning, the baffle 56 can be set to enclose the cleaned dust and foreign matter to avoid affecting the rotating gear 46, thereby achieving a good protective effect.

[0034] In a preferred embodiment, referring to Figure 5, Figure 6 and Figure 7 The gas collecting assembly 6 includes a cam 61 fixed to the end of the connecting shaft 51, the surface of the cam 61 is fitted with a limit block 62, a sliding rod 63 is fixed on one side of the limit block 62, a piston 64 is fixed on the end of the sliding rod 63, the piston 64 is slidably connected in the connecting cylinder 65, the connecting cylinder 65 is fixedly connected to the support plate 55 through a fixing plate, a tension spring 67 is fixed between the piston 64 and the connecting cylinder 65, the tension spring 67 is sleeved on the surface of the sliding rod 63, an air supply pipe 66 is fixed to one end of the connecting cylinder 65, one end of the air supply pipe 66 passes through the baffle 56 and is connected to the nozzle 69, the nozzle 69 is installed on one side of the baffle 56, an air inlet pipe 68 is provided at one end of the connecting cylinder 65, a one-way valve is installed between the air inlet pipe 68 and the air supply pipe 66 and the connecting cylinder 65, an oblique hole is opened at one end of the connecting cylinder 65, the oblique hole is connected to the rod cavity in the connecting cylinder 65, and the oblique hole points to the connection between the connecting shaft 51 and the cam 61.

[0035] In the above scheme, when the connecting shaft 51 rotates, it drives the cam 61 to rotate synchronously. The cam 61 reciprocates and squeezes the limit block 62, so that the piston 64 slides back and forth inside the connecting tube 65, sucks in air from the air inlet pipe 68 and then delivers it to the nozzle 69 through the air supply pipe 66 for spraying. The nozzle 69 points to the cleaning brush 54. In this way, when the cleaning brush 54 is cleaned, the cleaning brush 54 can be cleaned again by blowing the air flow to avoid foreign matter adhering to the surface of the cleaning brush 54, thereby achieving a self-cleaning effect. At the same time, the air flow in the rod cavity in the connecting tube 65 is sprayed through the inclined hole to the connection between the connecting shaft 51 and the synchronous belt 52, so that the heat generated by the friction of the components during operation is blown to cool it down, thereby extending its service life and saving maintenance costs.

[0036] A method for using a large prefabricated pile automatic welding device mainly comprises the following steps: Step A: The staff at the construction site connects the pipe pile to be welded with another pipe pile through a fixing fixture. Before the welding operation, the fixed ring 1 can be set on the surface of the pipe pile, and then the arc plate 2 is installed on the surface of the fixed ring 1, and the welding gun 3 set on the arc plate 2 is assembled with the fixed ring 1; Step B: During welding, a walking mechanism 4 is provided on the arc plate 2. The walking mechanism 4 is started to drive the welding gun 3 to move around the pile body. During this process, one end of the welding gun 3 is close to the joint of the two pile bodies for welding operation. When the walking mechanism 4 is moving, the processing component 5 is driven to run synchronously by the walking mechanism 4. The processing component 5 can be used to clean the welding slag and dust splashed in the walking area of ​​the walking mechanism 4. When the walking mechanism 4 is moving, it can also drive the gas collecting component 6 to run synchronously. In this way, the airflow generated by the operation of the gas collecting component 6 is transported to the processing component 5, and the cleaned parts at the processing component 5 can be blown for self-cleaning.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic welding device for large prefabricated piles, comprising a detachable fixing ring (1), the surface of the fixing ring (1) being provided with symmetrically distributed arc plates (2), one side of the arc plates (2) being provided with a welding gun (3), characterized in that: A walking mechanism (4) disposed on the arc-shaped plate (2), surrounding the surface of the arc-shaped plate (2) and used to drive the welding gun (3) to walk and perform welding operations; The walking mechanism (4) is provided with a processing component (5), which drives the processing component (5) to move when the walking mechanism (4) moves, so as to clean the front of the walking area on the curved plate (2); the walking mechanism (4) is provided with an air collection component (6), which drives the air collection component (6) to move when the walking mechanism (4) moves, thereby generating an airflow to perform self-cleaning treatment on the processing component (5).

2. The large prefabricated pile automatic welding device according to claim 1 is characterized in that: The ends of the two fixing rings (1) are rotatably connected via a pin shaft (11), and the other ends of the two fixing rings (1) are fixedly mounted on the pipe pile via a first bolt (10).

3. The large prefabricated pile automatic welding device according to claim 1 is characterized in that: The walking mechanism (4) comprises a T-shaped slide groove (43) provided on the arc-shaped plate (2), a T-shaped slider (42) being slidably connected inside the T-shaped slide groove (43), an L-shaped block (41) being fixed on the top of the T-shaped slider (42), a mounting seat (44) being fixed on one end of the L-shaped block (41), and a rotating member being arranged on the mounting seat (44).

4. The large prefabricated pile automatic welding device according to claim 3 is characterized in that: The rotating member comprises a driving portion (45) mounted on a mounting seat (44); an output end of the driving portion (45) passes through the mounting seat (44) and is fixed with a rotating gear (46); a surface of the rotating gear (46) is meshed with a tooth groove (47); the tooth groove (47) is provided on the surface of the arc plate (2); and the other end of the mounting seat (44) is fixedly connected to the welding gun (3).

5. The large prefabricated pile automatic welding device according to claim 4 is characterized in that: The processing assembly (5) comprises a connecting shaft (51) fixed at the axis of the rotating gear (46); a synchronous belt (52) is arranged on the surface of the connecting shaft (51); a rotating shaft (53) is driven on the surface of the synchronous belt (52); one end of the rotating shaft (53) is rotatably connected to a support plate (55) via a bearing; one end of the support plate (55) is fixedly connected to the welding gun (3); a cleaning brush (54) is installed on the surface of the rotating shaft (53); and the cleaning brush (54) is in contact with the tooth groove (47).

6. The large prefabricated pile automatic welding device according to claim 5 is characterized in that: The gas collecting assembly (6) comprises a cam (61) fixed to the end of the connecting shaft (51), the surface of the cam (61) is in contact with a limit block (62), a sliding rod (63) is fixed to one side of the limit block (62), a piston (64) is fixed to the end of the sliding rod (63), the piston (64) is slidably connected in a connecting tube (65), the connecting tube (65) is fixedly connected to a support plate (55) via a fixing plate, a tension spring (67) is fixed between the piston (64) and the connecting tube (65), and the tension spring (67) is sleeved on the surface of the sliding rod (63).

7. The large prefabricated pile automatic welding device according to claim 6 is characterized in that: An air delivery pipe (66) is fixed to one end of the connecting cylinder (65), one end of the air delivery pipe (66) passes through the baffle (56) and is in communication with a spray head (69), the spray head (69) being mounted on a side surface of the baffle (56), an air intake pipe (68) being arranged at one end of the connecting cylinder (65), and a one-way valve being mounted between the air intake pipe (68), the air delivery pipe (66) and the connecting cylinder (65).

8. The large prefabricated pile automatic welding device according to claim 7, characterized in that: An oblique hole is formed at one end of the connecting tube (65), the oblique hole being in communication with a rod cavity in the connecting tube (65), and the oblique hole pointing to the connection between the connecting shaft (51) and the cam (61).

9. The large prefabricated pile automatic welding device according to claim 1, characterized in that: The two arc-shaped plates (2) are spliced ​​into a circular ring shape, a support block (21) is fixed on the surface of the arc-shaped plate (2), a second bolt (23) is fixed on the outer wall of the fixing ring (1), and the support block (21) and the second bolt (23) are fixed together by screws.

10. A method for using a large prefabricated pile automatic welding device, according to claim 6, characterized in that: The main steps include: Step A: A worker connects a pipe pile to be welded with another pipe pile by means of a fixing fixture at the construction site. Before the welding operation, a fixing ring (1) is provided and sleeved on the surface of the pipe pile. Then, an arc plate (2) is installed on the surface of the fixing ring (1). A welding gun (3) provided on the arc plate (2) is assembled with the fixing ring (1); Step B: During welding, a walking mechanism (4) is provided on the arc plate (2). The walking mechanism (4) is started to drive the welding gun (3) to move around the pile body. During this process, one end of the welding gun (3) is close to the joint seam of the two pile bodies for welding. When the walking mechanism (4) is moving, the processing component (5) is driven by the walking mechanism (4) to run synchronously. The processing component (5) can be used to clean the welding slag and dust splashed in the walking area of ​​the walking mechanism (4). When the walking mechanism (4) is moving, it can also drive the gas collection component (6) to run synchronously. In this way, the airflow generated by the operation of the gas collection component (6) is transported to the processing component (5), and the cleaned parts at the processing component (5) can be blown to perform self-cleaning treatment.

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