Welding device of gas pipeline for gas engineering

Abstract

The invention discloses a gas pipeline welding device for gas engineering, which comprises a mounting base plate, a plurality of mounting holes are formed in the mounting base plate and used for mounting the mounting base plate on a machine tool, and pipeline interfaces are formed in the mounting base plate; the connecting base frame is mounted on the mounting base plate through a locking screw; the centering clamping mechanism is mounted on the connecting base frame; the input end of the rotating winding mechanism is provided with a driving motor, and the driving motor drives the rotating winding mechanism to rotate around the circle center of the pipeline port; and the circular seam welding head is mounted on the rotary winding mechanism, and the rotary winding mechanism drives the circular seam welding head to rotate. The pipelines are accurately aligned through the symmetrical clamping structures, the welding coaxiality is guaranteed, multi-stage gear transmission is matched with the sliding guide design, the welding track is stable and controllable, friction loss is reduced, the device is suitable for different pipe diameters, installation is flexible, manual errors are reduced through automatic surrounding welding, the efficiency and the welding seam quality are improved, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas pipeline processing equipment, in particular to a welding device for gas pipeline of gas engineering. BACKGROUND

[0002] In the construction of gas engineering, the welding quality of gas pipeline is directly related to the safety, sealing and service life of gas delivery system, and is the core link to ensure the stability of gas supply. With the acceleration of urbanization and the continuous growth of gas demand, the construction scale of long-distance, high-pressure gas pipeline network is expanding, and higher and higher requirements are put forward for the precision, stability and efficiency of pipeline welding technology.

[0003] The traditional gas pipeline welding operation relies on manual operation or semi-automatic equipment, which has the following outstanding problems: the positioning accuracy is insufficient, it is difficult to ensure the accurate alignment of the axes of the two pipes when manually clamping the pipe, and problems such as eccentricity and misalignment are prone to occur, which leads to uneven weld thickness, seriously affecting the welding strength and sealing, and increasing the safety hazard of gas leakage, especially for the butt joint of large diameter pipes or special-shaped pipes, the error rate of manual positioning is higher, and subsequent adjustment is time-consuming and laborious. At the same time, the welding track control is unstable, the traditional welding equipment is mainly realized by simple mechanical transmission, and lacks precise track constraint and guide structure, so the ring seam welding head is easy to be affected by vibration, uneven friction resistance and other factors when moving around the pipe, which leads to welding path deviation, and the ring-shaped weld appears discontinuous, incomplete welding or overlapping phenomenon, and cannot guarantee the continuity and consistency of the weld.

[0004] Therefore, we propose a welding device for gas pipeline of gas engineering to solve the above problems. SUMMARY

[0005] The purpose of the present application is to solve the problems in the prior art and provide a welding device for gas pipeline of gas engineering.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A welding device for gas pipeline of gas engineering, comprising:

[0008] A mounting base plate is provided with a plurality of mounting holes for mounting the mounting base plate on a machine tool, and a pipe aperture is provided on the mounting base plate;

[0009] A connecting base frame is installed on the mounting base plate by locking screws;

[0010] A centering and clamping mechanism is installed on the connecting base frame for clamping the gas pipeline and aligning the axis of the gas pipeline with the center of the pipe aperture;

[0011] The rotating arrangement mechanism is installed on the mounting base plate and the connecting base frame, an input end of the rotating arrangement mechanism is provided with a driving motor, and the driving motor drives the rotating arrangement mechanism to rotate around the center of the pipe ring.

[0012] The ring seam welding head is installed on the rotating arrangement mechanism to realize welding of the gas pipe.

[0013] In the welding device for the gas pipe of the gas engineering, the centering and clamping mechanism comprises a fixed connecting seat, the fixed connecting seat is installed on the connecting base frame, the same side of the fixed connecting seat is symmetrically connected with rotating supports, the center point of the rotating support coincides with the rotating point, the two rotating supports are jointly connected with a limiting telescopic frame, the midpoint of the limiting telescopic frame is rotatably connected to the fixed connecting seat, and the upper ends of the two rotating supports are jointly rotatably connected with an electric telescopic rod.

[0014] The side of the fixed connecting seat away from the rotating support is symmetrically rotatably connected with auxiliary rotating frames, and each auxiliary rotating frame is jointly installed with a pipe clamping jaw frame corresponding to the position of the rotating support.

[0015] In the welding device for the gas pipe of the gas engineering, the rotating arrangement mechanism comprises a driving gear, the driving gear is installed on the output shaft of the driving motor, two intermediate gears and two transmission gears are symmetrically installed on the mounting base plate and the connecting base frame, each intermediate gear is meshed with the driving gear, each transmission gear is meshed with the intermediate gear corresponding to the position, a tooth ring is installed on the mounting base plate, the two transmission gears are meshed with the tooth ring, and the ring seam welding head is installed on the tooth ring.

[0016] In the welding device for the gas pipe of the gas engineering, the mounting base plate comprises a reference main plate and a reference auxiliary plate, the reference main plate is connected with the reference auxiliary plate and forms a pipe ring, the reference main plate and the reference auxiliary plate are connected through two outer arc-shaped plates arranged symmetrically, the engagement groove is formed between the two outer arc-shaped plates, the reference main plate and the reference auxiliary plate, the inner side arc-shaped plate is arranged on the reference auxiliary plate, the end of the inner side arc-shaped plate is vertically provided with an arc-shaped mounting ring, the arc-shaped mounting ring and the reference main plate form an arc-shaped channel, and the ring seam welding head moves in the arc-shaped channel.

[0017] In the welding device for the gas pipe of the gas engineering, the tooth ring is slidably connected between the two outer arc-shaped plates, the reference main plate, the reference auxiliary plate and the inner side arc-shaped plate, a plurality of friction rollers are rotatably connected to the arc-shaped mounting ring, and the sidewall of the tooth ring is provided with a friction groove, and the friction roller is in contact with the friction groove.

[0018] In the welding device for gas pipeline of gas engineering, the end face of the tooth ring is provided with a sliding ring, and the reference attachment plate is provided with a sliding ring groove, and the sliding ring is located in the sliding ring groove.

[0019] In the welding device for gas pipeline of gas engineering, the connecting base frame comprises a Y-shaped connecting frame and an L-shaped connecting frame, the rotating winding mechanism is installed on the Y-shaped connecting frame, and the driving motor and the centering clamping mechanism are installed on the L-shaped connecting frame.

[0020] In the welding device for gas pipeline of gas engineering, the limiting telescopic frame comprises a telescopic base rod and a telescopic sub-rod, the telescopic sub-rod is slidably connected in the telescopic base rod, the telescopic base rod is rotatably connected to the fixed connecting seat and one of the rotating supports, and the telescopic sub-rod is rotatably connected to the other rotating support.

[0021] Compared with the prior art, the welding device for gas pipeline of gas engineering has the following beneficial effects:

[0022] 1. The centering clamping mechanism adopts a symmetrical linkage structure, the rotating support, the auxiliary rotating frame and the pipeline clamping jaw frame are driven to move symmetrically by the electric telescopic rod, the center point of the rotating support coincides with the rotation point, the balance of the clamping force on both sides is ensured, and the axis of the gas pipeline can be accurately aligned with the center of the pipeline ring opening. This design effectively avoids the eccentricity problem during pipeline butt joint, provides a coaxial reference for subsequent welding, significantly improves the uniformity and sealing performance of the weld, and reduces the risk of gas leakage.

[0023] 2. The rotating winding mechanism is multi-stage gear meshing transmission, cooperates with the sliding and rolling support of the tooth ring and the sliding ring groove, the friction roller and the friction groove, forms a stable circular motion driving system, the transmission gear is precisely meshed with the tooth ring through the meshing groove, and the tooth ring moves in the arc-shaped channel, ensuring that the ring seam welding head always moves along the circular arc trajectory of the pipeline butt joint, avoiding the deviation of the welding path, and ensuring the continuity and consistency of the ring weld.

[0024] 3. The driving motor drives the ring seam welding head to automatically rotate around the pipeline through the gear transmission system, without manual adjustment of the welding position, reducing human operation errors, not only reducing the labor intensity of workers, but also realizing continuous and stable welding operation, effectively improving the welding efficiency and quality stability of the gas pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the welding device for gas pipeline of gas engineering is provided.

[0026] Figure 2 The intuitive diagram of the welding device for gas pipeline of gas engineering from another perspective is provided.

[0027] Figure 3 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0028] Figure 4 Another perspective view of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0029] Figure 5 A structure diagram of the rotating winding mechanism in the welding device for the gas pipeline of the gas engineering;

[0030] Figure 6 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate; Figure 5 Another perspective view of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0031] Figure 7 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0032] Figure 8 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0033] Figure 9 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0034] Figure 10 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate; Figure 9 Another perspective view of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0035] Figure 11 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0036] Figure 12 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate;

[0037] Figure 13 A structure diagram of the welding device for the gas pipeline of the gas engineering without the mounting base plate.

[0038] In the figure: 1, mounting base plate; 101, pipe notch; 102, reference main plate; 103, reference auxiliary plate; 104, outer arc plate; 105, meshing notch; 106, inner arc plate; 107, arc-shaped mounting ring; 108, arc-shaped channel; 2, connecting base frame; 201, Y-shaped connecting frame; 202, L-shaped connecting frame; 3, driving motor; 4, ring seam welding head; 5, fixed connecting seat; 6, rotating support; 7, limiting telescopic frame; 8, electric telescopic rod; 9, auxiliary rotating frame; 10, pipe clamping jaw frame; 11, driving gear; 12, intermediate gear; 13, transmission gear; 14, toothed ring; 15, friction roller; 16, friction groove; 17, sliding ring; 18, sliding groove. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0040] EMBODIMENT

[0041] REFERENCE Figures 1-13 A welding device for a gas pipeline of a gas engineering, comprising:

[0042] The mounting base plate 1 is provided with a plurality of mounting holes for mounting the mounting base plate 1 on a machine tool. The mounting holes are arranged in an array to adapt to workbench surfaces of different models of machine tools, thereby improving the versatility and installation flexibility of the device. The mounting base plate 1 is provided with a pipe notch 101.

[0043] The two connecting base frames 2 are symmetrically arranged and mounted on the mounting base plate 1 by locking screws. The locking screws are high-strength internal hexagonal bolts used in combination with lock washers to effectively prevent loosening caused by welding vibration. The connecting base frames 2 include Y-shaped connecting frames 201 and L-shaped connecting frames 202, which are integrally formed by casting to have higher structural strength.

[0044] The centering clamping mechanism is respectively installed on the two connecting base frames 2, is used for clamping the gas pipeline and aligning the axis of the gas pipeline with the center of the pipe socket 101, and comprises fixed connecting seats 5, each of which is installed on the opposite connecting base frame 2, and the same side of the fixed connecting seat 5 is symmetrically connected with a rotating support 6, and the center point of the rotating support 6 coincides with the rotating point. The coincidence design is realized by precise tool positioning and machining, which ensures that the two sides of the force arm are completely symmetrical during rotation. The two rotating supports 6 are jointly connected with a limiting telescopic frame 7, and the midpoint of the limiting telescopic frame 7 is rotatably connected to the fixed connecting seat 5. The limiting telescopic frame 7 comprises a telescopic base rod and a telescopic sub-rod, the telescopic sub-rod is slidably connected in the telescopic base rod, the sliding fit surface of the telescopic base rod and the telescopic sub-rod is plated with chromium to reduce the friction coefficient and improve the wear resistance, and the telescopic base rod is rotatably connected to the fixed connecting seat 5 and one of the rotating supports 6. A stable triangular support structure is formed by the symmetrically arranged rotating supports 6 and the limiting telescopic frame 7. The stability of the triangular structure can effectively resist the vibration impact during welding to avoid deformation of the centering clamping mechanism. The telescopic sub-rod is rotatably connected to the other rotating support 6. The upper ends of the two rotating supports 6 are jointly rotatably connected with an electric telescopic rod 8. The electric telescopic rod 8 is driven by a servo motor and is equipped with a high-precision displacement sensor to realize accurate control of the clamping force. The side of the fixed connecting seat 5 away from the rotating support 6 is symmetrically rotatably connected with an auxiliary rotating frame 9. Each auxiliary rotating frame 9 is jointly installed with a pipe clamping jaw frame 10 between the position corresponding rotating support 6. The clamping surface of the pipe clamping jaw frame 10 is embedded with an arc-shaped rubber pad, which increases the friction to prevent slipping and avoids damaging the outer wall of the pipe. The telescopic movement of the electric telescopic rod 8 can drive the rotating support 6 to rotate synchronously. Since the center point of the rotating support 6 coincides with the rotating point, the symmetry of the movement of the two clamping jaws can be ensured, and eccentricity of the pipe clamping jaw frame 10 during clamping can be avoided. The telescopic base rod and the telescopic sub-rod of the limiting telescopic frame 7 are in sliding fit, which not only prevents the rotating support 6 from rotating excessively through mechanical limiting, but also adjusts the diameter of the pipe through telescopic adjustment. The rotating range of the rotating support 6 is limited, and the clamping demand of pipes with different diameters can be met. The cooperation of the auxiliary rotating frame 9 and the pipe clamping jaw frame 10 can realize uniform clamping at multiple points, avoid plastic deformation of the pipe caused by excessive local stress, and realize uniform clamping of the pipe at multiple points. The pipe axis is accurately aligned with the center of the pipe socket 101, which provides a core guarantee for the coaxiality of subsequent welding.

[0045] The rotating arrangement mechanism is symmetrically installed on the mounting base plate 1 and one of the connecting base frames 2, the input end of the rotating arrangement mechanism is provided with a driving motor 3, the rotating arrangement mechanism is installed on the Y-shaped connecting frame 201, the driving motor 3 is installed on one of the L-shaped connecting frames 202, the centering and clamping mechanism is installed on the corresponding L-shaped connecting frame 202 respectively, and the driving motor 3 drives the rotating arrangement mechanism to rotate around the center of the pipe ring 101; the rotating arrangement mechanism comprises a driving gear 11, the driving gear 11 is installed on the output shaft of the driving motor 3, two intermediate gears 12 and two transmission gears 13 are symmetrically installed on the mounting base plate 1 and the connecting base frame 2, the intermediate gears 12 and the transmission gears 13 are both installed on the shaft seat through precise bearings, the rotating smoothness is ensured, each intermediate gear 12 is engaged with the driving gear 11, and each transmission gear 13 is engaged with the corresponding intermediate gear 12, a tooth ring 14 is installed on the mounting base plate 1, the two transmission gears 13 are both engaged with the tooth ring 14, the ring seam welding head 4 is installed on the rotating arrangement mechanism to realize the welding of the gas pipeline, the rotating arrangement mechanism drives the ring seam welding head 4 to rotate, the ring seam welding head 4 is installed on the tooth ring 14, the two transmission gears 13 are symmetrically distributed in the installation position, the engagement areas of the two transmission gears 13 and the tooth ring 14 are complementary and overlapped, when the tooth ring 14 rotates, at least one transmission gear 13 is always engaged with the tooth surface of the tooth ring 14, the design effectively avoids the engagement interruption problem caused by the gear gap, installation error or component wear in single gear transmission, and ensures the continuity and stability of power transmission.

[0046] The mounting base plate 1 comprises a reference main plate 102 and a reference auxiliary plate 103, the reference main plate 102 is connected with the reference auxiliary plate 103 and forms the pipe ring 101, the reference main plate 102 and the reference auxiliary plate 103 are connected through two outer arc-shaped plates 104 arranged symmetrically, the two outer arc-shaped plates 104, the reference main plate 102 and the reference auxiliary plate 103 form an engagement groove 105, the transmission gear 13 is engaged with the tooth ring 14 through the engagement groove 105, the reference auxiliary plate 103 is provided with an inner arc-shaped plate 106, the end of the inner arc-shaped plate 106 is vertically provided with an arc-shaped mounting ring 107, the arc-shaped mounting ring 107 and the reference main plate 102 form an arc-shaped channel 108, and the ring seam welding head 4 moves in the arc-shaped channel 108, which significantly improves the straightness and circular consistency of the movement track of the ring seam welding head 4 and reduces the welding deviation.

[0047] The meshing of the tooth ring 14 and the transmission gear 13 is realized through the meshing notch 105, and the limiting space formed by the outer arc plate 104, the reference main plate 102, the reference auxiliary plate 103 and the inner side arc plate 106 ensures the consistency of the track of the joint between the ring seam welding head 4 and the gas pipeline during the welding process, limits the displacement of the tooth ring 14 from multiple radial dimensions, and eliminates the movement caused by the gear meshing gap, thereby limiting the radial displacement of the tooth ring 14.

[0048] The tooth ring 14 is slidingly connected between the two outer arc plates 104, the reference main plate 102, the reference auxiliary plate 103 and the inner side arc plate 105, and the end face of the tooth ring 14 is provided with a sliding ring 17 made of wear-resistant cast iron and subjected to fine grinding treatment. The reference auxiliary plate 103 is provided with a sliding ring groove 18, and the sliding ring 17 is located in the sliding ring groove 18. High-temperature lubricating grease is applied in the sliding ring groove 18 to maintain lubrication effect in the high-temperature environment of the welding operation. A plurality of friction rollers 15 are uniformly rotatably connected to the arc-shaped mounting ring 107, and the sidewall of the tooth ring 14 is provided with a friction groove 16, and the friction roller 15 is in contact with the friction groove 16. The edge of the groove of the friction groove 16 is rounded to avoid the phenomenon of jamming when the friction roller 15 moves.

[0049] The mounting base plate 1 is fixed on the machine tool through the mounting holes on the reference main plate 102 and the reference auxiliary plate 103 to form a stable support foundation. The pipeline ring opening 101 formed by splicing the reference main plate 102 and the reference auxiliary plate 103 is the butt joint area of the gas pipeline. The two sections of gas pipeline to be welded pass through the device through the pipeline ring opening 101, and the axis thereof needs to be aligned with the center of the pipeline ring opening 101 (subsequently calibrated by the centering clamping mechanism).

[0050] The centering clamping mechanism is installed on the L-shaped connecting frame 202 through the fixed connecting seat 5. The core thereof realizes the centering positioning of the pipeline through a symmetrical linkage structure. When the electric telescopic rod 8 is extended or retracted, the two rotating supports 6 are driven to symmetrically rotate around the rotation point on the fixed connecting seat 5 (the center point of the rotating support 6 coincides with the rotation point to ensure the symmetry of the movement). The rotating support 6 drives the limiting telescopic frame 7 to synchronously extend or retract, and simultaneously drives the pipeline clamping jaw frame 10 on both sides to move towards or away from each other through the auxiliary rotating frame 9, so as to finally clamp the gas pipeline and make the axis of the pipeline accurately coincide with the center of the pipeline ring opening 101, thereby providing a coaxial reference for subsequent welding. The two centering clamping mechanisms can realize the separate clamping of the two sections of gas pipeline, realize the alignment of the two sections of gas pipeline, and prepare for the welding thereof.

[0051] When the driving motor 3 is started, the rotating winding mechanism makes a circular motion around the center of the pipe winding port 101, providing the circular seam welding head 4 with the power to surround the pipe. First, the output shaft of the driving motor 3 drives the driving gear 11 to rotate, and the driving gear 11 meshes with the two intermediate gears 12, transmitting power to the intermediate gears 12. Each intermediate gear 12 meshes with the corresponding transmission gear 13, achieving power splitting and steering. The two transmission gears 13 mesh with the tooth winding ring 14 fixed on the mounting base plate 1 through the meshing slot 105 of the mounting base plate 1. Since the transmission gear 13 is rotated by the tooth surface reaction force of the tooth winding ring 14, the tooth winding ring 14 makes a circular motion around the center of the pipe winding port 101.

[0052] The circular seam welding head 4 is installed on the tooth winding ring 14 and moves synchronously with the rotating winding mechanism. The tooth winding ring 14 drives the circular seam welding head 4 to move in the arc-shaped channel 108 formed by the reference main plate 102 and the arc-shaped mounting ring 107, ensuring that the circular seam welding head 4 always makes a circular motion with the center of the pipe winding port 101 as the center. The motion path is consistent with the arc of the pipe joint. When the rotating winding mechanism drives the circular seam welding head 4 to rotate around the gas pipe along the arc-shaped channel 108, the circular seam welding head 4 performs continuous welding work on the pipe joint. Since the pipe has been fixed by the centering and clamping mechanism and is concentric with the pipe winding port 101, the rotation trajectory of the circular seam welding head 4 is coaxial with the pipe axis, finally forming a uniform annular weld.

[0053] The tooth winding ring 14 is matched with the sliding winding groove 18 of the reference auxiliary plate 103 through the sliding winding ring 17, and the friction groove 16 on the side wall of the tooth winding ring 14 is in contact with the friction roller 15 on the arc-shaped mounting ring 107, reducing the friction resistance during rotation and ensuring the stability of the circular motion. The outer arc-shaped plate 104 and the inner arc-shaped plate 106 of the mounting base plate form a limiting space, restricting the motion trajectory of the tooth winding ring 14 and avoiding deviation.

[0054] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent substitutions or changes within the technical scope disclosed by the present application and according to the technical solutions and inventive concepts of the present application, which should be covered within the protection scope of the present application.

Claims

1. A welding device for a gas pipeline for gas engineering, characterized in that: The utility model relates to a kind of gas pipe ring seam welding machine, including: Mounting base plate (1), several mounting holes are opened on the mounting base plate (1), for the installation of mounting base plate (1) on machine tool, pipe flange opening (101) is opened on the mounting base plate (1); Two connection base frames (2) are symmetrically arranged, and are mounted on the mounting base plate (1) by locking screw; Centering clamping mechanism is respectively mounted on two connection base frames (2), for the clamping of gas pipe and the coincidence of the axis of gas pipe and the center of pipe flange opening (101); Rotary winding mechanism is jointly mounted on mounting base plate (1) and one of connection base frames (2), input end of the rotary winding mechanism is mounted with driving motor (3), and driving motor (3) drives rotary winding mechanism to rotate around the center of pipe flange opening (101); Ring seam welding head (4) is mounted on rotary winding mechanism, realizes the welding of gas pipe, and rotary winding mechanism drives ring seam welding head (4) to rotate.

2. A welding device for gas pipes for gas engineering according to claim 1, characterized in that The centering clamping mechanism includes fixed connecting seat (5), and fixed connecting seat (5) is mounted on connection base frame (2), the same side of fixed connecting seat (5) is symmetrically rotatably connected with rotary support (6), and the center point of rotary support (6) coincides with rotation point, limit telescopic frame (7) is rotatably connected between two rotary supports (6), and the midpoint of limit telescopic frame (7) is rotatably connected on fixed connecting seat (5), and the upper end of two rotary supports (6) is rotatably connected with electric telescopic rod (8); The side of fixed connecting seat (5) away from rotary support (6) is symmetrically rotatably connected with auxiliary rotary frame (9), and pipe clamping jaw frame (10) is jointly mounted between each auxiliary rotary frame (9) and position corresponding rotary support (6).

3. A welding device for gas pipes for gas engineering according to claim 1, characterized in that The rotary winding mechanism includes driving gear (11), and driving gear (11) is mounted on the output shaft of driving motor (3), two intermediate gears (12) and two transmission gears (13) are jointly and symmetrically installed on mounting base plate (1) and connection base frame (2), each intermediate gear (12) is engaged with driving gear (11), and each transmission gear (13) is engaged with position corresponding intermediate gear (12), gear ring (14) is installed on mounting base plate (1), and two transmission gears (13) are engaged with gear ring (14), and ring seam welding head (4) is installed on gear ring (14).

4. A welding apparatus for gas pipes for gas engineering according to claim 3, characterized in that The installation base plate (1) comprises a reference main plate (102) and a reference auxiliary plate (103), and the reference main plate (102) is connected with the reference auxiliary plate (103) and forms a pipeline ring mouth (101), the reference main plate (102) and the reference auxiliary plate (103) are connected through two outer arc plates (104) arranged symmetrically, the two outer arc plates (104), the reference main plate (102) and the reference auxiliary plate (103) form a meshing slot (105) therebetween, the reference auxiliary plate (103) is provided with an inner arc plate (106), the end of the inner arc plate (106) is vertically provided with an arc-shaped mounting ring (107), the arc-shaped mounting ring (107) and the reference main plate (102) form an arc-shaped channel (108) therebetween, and the ring seam welding head (4) moves in the arc-shaped channel (108).

5. A welding apparatus for gas pipes for gas engineering according to claim 4, characterized in that The tooth ring (14) is slidingly connected between the two outer arc plates (104), the reference main plate (102), the reference auxiliary plate (103) and the inner arc plate (105), a plurality of friction rollers (15) are uniformly rotatably connected to the arc-shaped mounting ring (107), the sidewall of the tooth ring (14) is provided with a friction groove (16), and the friction roller (15) is in contact with the friction groove (16).

6. A welding apparatus for gas pipes for gas engineering according to claim 5, characterized in that The end surface of the tooth ring (14) is provided with a sliding ring (17), the reference auxiliary plate (103) is provided with a sliding ring groove (18), and the sliding ring (17) is located in the sliding ring groove (18).

7. A welding device for gas pipes for gas engineering according to claim 1, characterized in that The connecting frame (2) comprises a Y-shaped connecting frame (201) and an L-shaped connecting frame (202), the rotating winding mechanism is mounted on the Y-shaped connecting frame (201), and the driving motor (3) and the centering clamping mechanism are mounted on the L-shaped connecting frame (202).

8. A welding device for gas pipes for gas engineering according to claim 2, characterized in that The limiting telescopic frame (7) comprises a telescopic base rod and a telescopic sub-rod, the telescopic sub-rod is slidingly connected in the telescopic base rod, the telescopic base rod is rotatably connected to the fixed connecting seat (5) and one of the rotating supports (6), and the telescopic sub-rod is rotatably connected to the other rotating support (6).

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