Circular pipeline welding method

Abstract

The invention relates to a circular pipeline welding method which is completed through circular pipeline welding equipment, and the welding process comprises the steps that the circular pipeline welding equipment is moved to the side of a circular pipeline through a motor vehicle, and the circular pipeline is sleeved with a positioning ring; the position of the positioning ring is adjusted until the welding gun is aligned with the butt joint position of the two sections of round pipelines needing to be welded together and meets the requirement, the welding machine body is started for welding, meanwhile, the moving mechanism moves in the circumferential direction of the positioning ring at the needed speed, and when the moving mechanism moves by 360 degrees, welding of the whole butt joint position of the round pipelines is completed. The device has the advantages that the whole circumferential direction of the pipeline can be continuously completed without changing the distance of the welding gun in a labor-saving manner, and the problems that the quality of two sections of pipelines is poor and labor is wasted during manual welding are solved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline welding, and in particular to a round pipeline welding method. Background Art

[0002] During the construction of round pipes such as petrochemical pipelines, two adjacent pipe sections need to be welded together. TIG welding is usually used for welding. TIG welding is a welding technology that uses argon as a shielding gas. It is also called argon gas shielded welding. It is to pass argon shielding gas around the arc welding to isolate the air outside the welding area to prevent oxidation of the welding area.

[0003] Argon arc welding technology is a welding technology based on the principle of ordinary arc welding. It uses argon gas to protect metal welding materials. Through high current, the welding materials are melted into liquid on the welded substrate to form a molten pool, so that the welded metal and the welding materials can achieve metallurgical bonding. Since argon gas is continuously supplied during high-temperature molten welding, the welding materials cannot contact with oxygen in the air, thereby preventing the oxidation of the welding materials. Therefore, stainless steel and iron hardware metals can be welded. The existing welding of two sections of round pipes is performed by manually holding a welding gun, a welding wire feeding head and an output head of an argon gas output pipe moving along the circumference of the pipe. This method is not only laborious but also cannot weld the entire circumference of the pipe at one time. During welding, the distance between the welding gun and the welding point cannot be guaranteed to be consistent, resulting in poor welding quality consistency. Summary of the invention

[0004] The invention aims to provide a circular pipe welding method which can save effort and ensure that the welding gun distance remains unchanged to continuously complete the welding of the entire circumference of the pipe, thereby solving the problems of poor quality and laboriousness of two sections of pipes during manual welding.

[0005] The above technical problems are solved by the following technical solutions: a circular pipe welding method, characterized in that it is completed by a circular pipe welding device, the circular pipe welding device includes a welding machine body, a welding wire feeding head, a welding gun, a motor vehicle and a positioning ring, the positioning ring is used to be sleeved on the circular pipe, the welding gun is connected to the welding machine body through an electric wire, the welding machine body is installed on the motor vehicle, the positioning ring is connected to a moving mechanism that travels along the circumference of the positioning ring, the welding wire feeding head and the welding gun are connected to the moving mechanism, the welding gun faces the circumference of the circular pipe, and the positioning ring is provided with a moving mechanism that travels along the circumference of the positioning ring A plurality of tightening structures are distributed circumferentially of the ring, and the tightening structure is used to tighten the circular pipe when the positioning ring is sleeved on the circular pipe so that the positioning ring and the circular pipe are coaxially fixed together; the welding process is: the circular pipe welding equipment is moved to the side of the circular pipe by a motor vehicle, the positioning ring is sleeved on the circular pipe, the position of the positioning ring is adjusted to align the welding gun with the butt joint of the two sections of the circular pipe to be welded together and the position meets the requirements, and the moving mechanism moves along the circumference of the positioning ring at the required speed while the welding machine body is started for welding, and the welding of the entire butt joint of the circular pipe is completed when the moving mechanism moves 360°. The present invention can automatically complete the welding of the circular pipe butt joint for one week, and can maintain the welding gun at any angle to keep the same distance from the welding point so that the weld is smooth, the welding quality is stable, and manual welding can be avoided to damage human health.

[0006] Preferably, the motor vehicle is a tracked vehicle, which can better improve the passability in case of accidental walking.

[0007] Preferably, the mobile mechanism includes a mobile frame, at least three pairs of running wheels arranged on the mobile frame, a driving gear arranged on the mobile frame, a power mechanism for driving the driving gear to rotate, and a gear ring meshed with the driving gear, the gear ring is connected to the positioning ring, the gear ring and the positioning ring are coaxial, two pairs of the three pairs of running wheels are located at one axial end of the positioning ring, and the other pair of running wheels is located at the other axial end of the positioning ring, one of the two running wheels in the same pair of running wheels is located outside the positioning ring, and the other running wheel is located inside the positioning ring, and the two running wheels in the same pair of running wheels clamp the positioning ring. A specific structure of a mobile mechanism is provided.

[0008] Preferably, inner chamfered surfaces are provided at both axial ends of the inner circumference of the positioning ring, and outer chamfered surfaces are provided at both axial ends of the outer circumference of the positioning ring. The walking wheel located at one axial end of the positioning ring and located inside the positioning ring is supported on the inner chamfered surface at one end of the positioning ring, the walking wheel located at one axial end of the positioning ring and located outside the positioning ring is supported on the outer chamfered surface at one end of the positioning ring, the walking wheel located at the other axial end of the positioning ring and located inside the positioning ring is supported on the inner chamfered surface at the other end of the positioning ring, and the walking wheel located at the other axial end of the positioning ring and located outside the positioning ring is supported on the outer chamfered surface at the other end of the positioning ring. The walking wheel balances the chamfered surface and can play a role in axial positioning, preventing the moving mechanism from moving axially in the process of moving along the circumferential direction of the positioning ring, which causes the welding position to deviate and causes leakage welding.

[0009] Preferably, the tightening structure comprises a base section connected to the positioning ring and an extrusion section threadedly connected to the base section, and the base section and the extrusion section are distributed along the radial direction of the positioning ring. When in use, the extrusion section is rotated to tighten the circular pipe and adjust the coaxiality of the circular pipe and the positioning ring at the same time.

[0010] Preferably, the tightening structures have two rows, the two rows of tightening structures are distributed along the axial direction of the positioning ring, and the tightening structures in the same row of tightening structures are distributed along the circumference of the positioning ring. This can avoid the axial tilt of the positioning ring causing the positioning ring and the round pipe to be out of axial alignment, thereby ensuring the welding quality.

[0011] Preferably, the tightening structure comprises a positioning rod and a brake rod connected to the positioning ring through a swing shaft and a driving member that drives the brake rod to swing with the swing shaft as the axis to abut against the circular pipe. The end of the positioning rod can be rotatably connected to a support ball for contacting the circular pipe. When the circular pipe is supported by all the support balls of the positioning rod, it is coaxial with the positioning ring. When welding, the moving mechanism is rotated in the direction of driving the positioning ring to drive the brake rod to abut against the circular pipe. After the brake rod is pressed against the circular pipe, the positioning ring is fixed on the circular pipe, thereby ensuring that it does not shift during the welding process. When the positioning ring is to be moved on the petrochemical fixation, the moving mechanism is moved in the opposite direction to avoid the brake rod from abutting against the circular pipe, and the support ball remains supported on the domestic pipe, thereby saving effort during the movement and still being able to keep the positioning ring and the circular pipe coaxial, avoiding the need for secondary correction of the coaxiality of the circular pipe and the positioning ring after the movement, thereby increasing the efficiency of multiple welding machines on a pipeline.

[0012] Preferably, the tightening structure further comprises a base, the positioning rod and the brake rod are both connected to the base, a rotation-stopping rod having one end fixed to the positioning ring is provided on the base, the base is connected to the positioning ring through a double-threaded rod, the double-threaded rod and the rotation-stopping rod are parallel, and the welding gun is adjustably connected to the moving mechanism along the radial position of the positioning ring. The position can be adjusted so that the present invention is suitable for welding of round pipes of different diameters.

[0013] Preferably, the positioning rod extends radially along the positioning ring, and the double-threaded rod drives the positioning rod to extend radially along the positioning ring when rotating. When switching to weld round pipes of different diameters, it is convenient and quick to adjust the coaxiality of the positioning ring and the round pipe.

[0014] Preferably, the driving member is a torsion spring sleeved on the swing shaft; or The driving member includes a ferromagnet arranged on the brake rod and a permanent magnet arranged on the positioning rod and adsorbing the ferromagnet. When the brake rod swings toward the direction close to the circular pipe with the swing shaft as the axis, a section of the brake rod in contact with the circular pipe approaches the positioning rod.

[0015] The present invention has the following advantages: no manual movement of the welding gun is required during welding, labor is saved, the welding gun distance can be maintained consistent, the welding of the entire circumference of the pipeline can be completed continuously, the welding quality is good, and the welding equipment can move automatically in case of accidents without manual movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the round pipe welding equipment in Example 1; Figure 2 for Figure 1 A partial schematic diagram of Figure 3 It is a partial schematic diagram of the round pipe welding equipment in the second embodiment; Figure 4 for Figure 3 A local enlarged schematic diagram of point A.

[0017] In the figure: welding machine body 1, welding wire feeding head 2, welding gun 3, argon cylinder 4, motor vehicle 5, positioning ring 6, electric wire 7, argon gas output pipe 8, winding reel 9, moving mechanism 10, welding wire 11, top tightening structure 12, base section 13, extrusion section 14, moving frame 15, walking wheel 16, driving gear 17, gear ring 18, inner chamfered inclined surface 19, outer chamfered inclined surface 20, base 21, positioning rod 22, swing shaft 23, brake rod 24, support ball 25, anti-rotation rod 26, double-headed threaded rod 27, ferromagnet 28, permanent magnet 29, round pipe 30. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1, see Figure 1 and Figure 2A circular pipe welding method is completed by a circular pipe welding device, which includes a welding machine body 1, a welding wire feeding head 2, a welding gun 3, an argon gas bottle 4, a motor vehicle 5 and a positioning ring 6. The motor vehicle is a tracked vehicle. The positioning ring is used to be sleeved on the circular pipe. The welding gun is connected to the welding machine body through an electric wire 7, and the argon gas bottle is provided with an argon gas output pipe 8. The welding machine body, the argon gas bottle and the winding reel 9 (for winding the welding wire) are installed on the motor vehicle. A moving mechanism 10 that moves along the circumference of the positioning ring is connected to the positioning ring, and the outlet ends of the welding wire feeding head, the welding gun and the argon gas output pipe are connected to the moving mechanism, and the welding wire 11 is automatically transported by the welding wire feeding head. The welding gun faces the circumference of the circular pipe. The positioning ring is provided with a plurality of tightening structures 12 distributed along the circumference of the positioning ring. The tightening structure is used to tighten the circular pipe when the positioning ring is sleeved on the circular pipe so that the positioning ring is coaxially fixed with the circular pipe. The tightening structure includes a base section 13 connected to the positioning ring and an extrusion section 14 threadedly connected to the base section, and the base section and the extrusion section are distributed along the radial direction of the positioning ring. When in use, the circular pipe is tightened by rotating the extrusion section and the coaxiality of the circular pipe and the positioning ring is adjusted. The tightening structure has two rows, and the two rows of tightening structures are distributed along the axial direction of the positioning ring. The tightening structures in the same row of tightening structures are distributed along the circumferential direction of the positioning ring. The moving mechanism includes a moving frame 15, four pairs of running wheels 16 arranged on the moving frame, a driving gear 17 arranged on the moving frame, a power mechanism (the power mechanism is specifically a motor) for driving the driving gear to rotate, and a gear ring 18 meshed with the driving gear. The gear ring is connected to the positioning ring, and the gear ring and the positioning ring are coaxial. Two pairs of running wheels are located at one axial end of the positioning ring, and the other two pairs of running wheels are located at the other axial end of the positioning ring. One of the two running wheels in the same pair of running wheels is located outside the positioning ring, and the other running wheel is located inside the positioning ring. The two running wheels in the same pair of running wheels clamp the positioning ring. Inner chamfered surfaces 19 are provided at both axial ends of the inner circumference of the positioning ring, and outer chamfered surfaces 20 are provided at both axial ends of the outer circumference of the positioning ring. The running wheel located at one axial end of the positioning ring and located inside the positioning ring is supported on the inner chamfered surface at one end of the positioning ring, the running wheel located at one axial end of the positioning ring and located outside the positioning ring is supported on the outer chamfered surface at one end of the positioning ring, the running wheel located at the other axial end of the positioning ring and located inside the positioning ring is supported on the inner chamfered surface at the other end of the positioning ring, and the running wheel located at the other axial end of the positioning ring and located outside the positioning ring is supported on the outer chamfered surface at the other end of the positioning ring.

[0020] When in use, the circular pipe welding equipment is moved to the side of the circular pipe by a motor vehicle, the positioning ring is put on the circular pipe, the position of the positioning ring is adjusted until the welding gun is aligned with the butt joint of the two sections of the circular pipe to be welded together and the position meets the requirements, the welding machine body is started for welding and the moving mechanism moves along the circumference of the positioning ring at a required speed, and when the moving mechanism moves 360°, the welding of the entire butt joint of the circular pipe is completed.

[0021] Embodiment 2 is different from Embodiment 1 in that: See also Figure 3 and Figure 4 The tightening structure includes a base 21, a positioning rod 22 fixed on the base, a brake rod 24 connected to the base through a swing shaft 23, and a driving member that drives the brake rod to swing with the swing shaft as the axis to abut against the circular pipe. The end of the positioning rod can be rotatably connected with a support ball 25 for contacting the circular pipe, and the circular pipe is coaxial with the positioning ring when supported by the support balls of all the positioning rods. When welding, the moving mechanism is rotated in the direction of driving the positioning ring to drive the brake rod to abut against the circular pipe, and the positioning ring is fixed on the circular pipe 30 after the brake rod is pressed against the circular pipe, thereby ensuring that it does not shift during the welding process. When the positioning ring is to be moved on the petrochemical fixed, the moving mechanism is moved in the opposite direction to avoid the brake rod from abutting against the circular pipe, and the support ball remains supported on the domestic pipe, so that the movement process is labor-saving and the positioning ring and the circular pipe can still be kept coaxial, avoiding the need for secondary correction of the coaxiality of the circular pipe and the positioning ring after the movement, thereby making the efficiency of multiple welding machines on a pipeline high.

[0022] The base is provided with a stop rod 26 with one end fixed to the positioning ring. The base is connected to the positioning ring through a double-threaded rod 27. The double-threaded rod and the stop rod are parallel. The welding gun is connected to the moving mechanism in an adjustable radial position along the positioning ring. The positioning rod extends in the radial direction of the positioning ring. When the double-threaded rod rotates, the positioning rod is driven to extend in the radial direction of the positioning ring. The driving member includes a ferromagnet 28 arranged on the brake rod and a permanent magnet 29 arranged on the positioning rod to absorb the ferromagnet. When the brake rod swings in the direction close to the circular pipe with the swing shaft as the axis, the section of the brake rod in contact with the circular pipe approaches the positioning rod.

[0023] Embodiment 3 is different from Embodiment 2 in that the driving member is a torsion spring sleeved on the swing shaft.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A round pipe welding method, It is characterized in that The process is completed by a circular pipe welding device, the circular pipe welding device comprises a welding machine body, a welding wire feeding head, a welding gun, a motor vehicle and a positioning ring, the positioning ring is used to be sleeved on the circular pipe, the welding gun is connected to the welding machine body through an electric wire, the welding machine body is installed on the motor vehicle, a moving mechanism that moves along the circumferential direction of the positioning ring is connected to the positioning ring, the welding wire feeding head and the welding gun are connected to the moving mechanism, the welding gun faces the circumferential surface of the circular pipe, and the positioning ring is provided with a plurality of tightening structures distributed along the circumferential direction of the positioning ring, the tightening structure is used to tighten the circular pipe when the positioning ring is sleeved on the circular pipe so that the positioning ring and the circular pipe are coaxially fixed together; the welding process is: the circular pipe welding device is moved to the side of the circular pipe by the motor vehicle, the positioning ring is sleeved on the circular pipe, the position of the positioning ring is adjusted to align the welding gun with the butt joint of the two sections of the circular pipe to be welded together and the position meets the requirements, the welding machine body is started to weld while the moving mechanism moves along the circumferential direction of the positioning ring at a required speed, and the welding of the entire butt joint of the circular pipe is completed when the moving mechanism moves 360°.

2. A round pipe welding method according to claim 1, It is characterized in that The motor vehicle is a tracked vehicle.

3. A round pipe welding method according to claim 1, It is characterized in that The mobile mechanism includes a mobile frame, at least three pairs of walking wheels arranged on the mobile frame, a driving gear arranged on the mobile frame, a power mechanism for driving the driving gear to rotate and a gear ring meshing with the driving gear, the gear ring is connected to the positioning ring, the gear ring and the positioning ring are coaxial, two pairs of walking wheels among the three pairs of walking wheels are located at one axial end of the positioning ring, and the other pair of walking wheels is located at the other axial end of the positioning ring, one of the two walking wheels in the same pair of walking wheels is located outside the positioning ring, and the other walking wheel is located inside the positioning ring, and the two walking wheels in the same pair of walking wheels clamp the positioning ring.

4. A round pipe welding method according to claim 3, It is characterized in that Inner chamfered surfaces are provided at both axial ends of the inner circumference of the positioning ring, and outer chamfered surfaces are provided at both axial ends of the outer circumference of the positioning ring. The walking wheel located at one axial end of the positioning ring and located inside the positioning ring is supported on the inner chamfered surface at one end of the positioning ring, the walking wheel located at one axial end of the positioning ring and located outside the positioning ring is supported on the outer chamfered surface at one end of the positioning ring, the walking wheel located at the other axial end of the positioning ring and located inside the positioning ring is supported on the inner chamfered surface at the other end of the positioning ring, and the walking wheel located at the other axial end of the positioning ring and located outside the positioning ring is supported on the outer chamfered surface at the other end of the positioning ring.

5. A round pipe welding method according to claim 1, It is characterized in that The tightening structure includes a base section connected to the positioning ring and an extrusion section threadedly connected to the base section, and the base section and the extrusion section are distributed along the radial direction of the positioning ring. When in use, the extrusion section is rotated to tighten the circular pipe and adjust the coaxiality of the circular pipe and the positioning ring at the same time.

6. A round pipe welding method according to claim 1, It is characterized in that The tightening structures are arranged in two rows, the tightening structures in the two rows are distributed along the axial direction of the positioning ring, and the tightening structures in the same row are distributed along the circumferential direction of the positioning ring.

7. A round pipe welding method according to claim 1, It is characterized in that The tightening structure includes a positioning rod and a brake rod connected to a positioning ring through a swing shaft, and a driving member that drives the brake rod to swing with the swing shaft as the axis to abut against the circular pipe. The end of the positioning rod is rotatably connected to a support ball for contacting the circular pipe. When the circular pipe is supported by the support balls of all the positioning rods, it is coaxial with the positioning ring. When welding is performed, the moving mechanism is rotated in the direction of driving the positioning ring to overdrive the brake rod to abut against the circular pipe. After the brake rod is tightened against the circular pipe, the positioning ring is fixed on the circular pipe, thereby ensuring fixation during welding. When the positioning ring needs to be moved on the petrochemical fixation, the moving mechanism is moved in the opposite direction to avoid the brake rod abutting against the circular pipe, and the support balls remain supported on the domestic pipe.

8. A round pipe welding method according to claim 7, It is characterized in that The tightening structure also includes a base, and the positioning rod and the brake rod are both connected to the base. The base is provided with a stop rod with one end fixed to the positioning ring. The base is connected to the positioning ring through a double-headed threaded rod, and the double-headed threaded rod and the stop rod are parallel. The welding gun is adjustably connected to the moving mechanism along the radial position of the positioning ring.

9. A round pipe welding method according to claim 8, It is characterized in that The positioning rod extends in the radial direction of the positioning ring, and the double-start threaded rod drives the positioning rod to extend in the radial direction of the positioning ring when rotating.

10. A round pipe welding method according to claim 7, It is characterized in that The driving member includes a ferromagnet arranged on the brake rod and a permanent magnet arranged on the positioning rod and adsorbing the ferromagnet. When the brake rod swings toward the direction close to the circular pipe with the swing shaft as the axis, a section of the brake rod in contact with the circular pipe approaches the positioning rod.

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