Automatic welding equipment and welding method for petrochemical pipeline engineering

Abstract

The application relates to an automatic welding device and a welding method for petrochemical pipeline engineering applied to the field of pipeline welding. When two pipelines with the same diameter are welded, the conventional constraint treatment can be performed by using a constraint belt and a rack plate; when a straight cylinder pipeline and a conical pipeline are aligned, the surface of the conical pipeline can be effectively constrained by using the cooperation of an electric telescopic rod and a pressing plate, and then the straight cylinder pipeline subjected to the conventional constraint treatment is aligned; when the end of the straight cylinder pipeline and the symmetrical circular arc pipeline are aligned, the circular arc pipeline is subjected to the operation of first deflection, then stable constraint and finally rotation alignment by using the cooperation of a guide rod, an adjusting piece, a fixed motor and a constraint belt, so that the end alignment of the straight cylinder pipeline and the circular arc pipeline is realized; and after alignment, the cooperation of a gear ring piece, a driving motor and an electric telescopic rod enables a welding gun to perform the circumferential welding treatment on the end of the aligned pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to an automatic welding device, in particular to an automatic welding device for petrochemical pipeline engineering and a welding method applied to the field of pipeline welding. BACKGROUND

[0002] Petrochemical pipeline engineering is a crucial part of the petrochemical industry, involving the transportation, storage, and distribution of petroleum, natural gas, and their derivative products. Common pipeline materials include carbon steel, stainless steel, alloy steel, etc. Pipeline construction includes welding, corrosion protection, and insulation steps. Welding is the main way of connecting pipelines and needs to be strictly in accordance with standards to ensure the quality of the weld. Corrosion protection and insulation treatment can extend the service life of the pipeline and reduce maintenance costs.

[0003] Chinese patent CN118893359B specification discloses a chemical equipment ventilation pipeline welding device that can realize horizontal feeding without the need for other hoisting equipment, and simultaneously realizes the functions of rapid alignment of the ventilation pipe welding surface and automatic adjustment of the welding gun position, greatly simplifying the pipeline welding steps. In addition, Chinese patent CN118081158B specification discloses a petrochemical pipeline welding device with automatic alignment function, which automatically aligns the petrochemical pipeline, reduces the offset of the petrochemical pipeline during welding, and affects the quality of the welding interface, affecting the use of the petrochemical pipeline.

[0004] When existing chemical pipelines are welded, it is usually considered to weld two straight cylindrical pipes of the same diameter. However, in actual operation, there may be a situation where a large pipe and a small pipe are transition welded through a conical pipe. During the end alignment operation of the conical pipe, the conventional arc-shaped lifting piece cannot effectively and stably lift and limit the conical pipe, thereby affecting the subsequent welding quality. SUMMARY

[0005] To solve the above-mentioned problems, the present application provides an automatic welding device for petrochemical pipeline engineering, which includes two lifting bottom plates, each of which is installed with two symmetrically arranged support brackets on the top, each support bracket is internally installed with a round rod and a rotating motor below the round rod, and the output end of the rotating motor is connected with a rotating gear, and the top surface of the lifting bottom plate is slidingly connected with a rack plate engaged with the rotating gear.

[0006] To solve the above-mentioned problems, the present application provides an automatic welding device for petrochemical pipeline engineering, which includes two lifting bottom plates, each of which is installed with two symmetrically arranged support brackets on the top, each support bracket is internally installed with a round rod and a rotating motor below the round rod, and the output end of the rotating motor is connected with a rotating gear, and the top surface of the lifting bottom plate is slidingly connected with a rack plate engaged with the rotating gear.

[0007] One side bottom of one of the lifting bottom plates is provided with a servo motor, an output end of the servo motor is connected with a rotating support, the surface of the rotating support is connected with a ring piece through a cross bar, a plurality of strip-shaped grooves are arranged in a ring shape in the ring piece, a self-rebound rotating shaft is arranged on the inner wall of the strip-shaped groove and is connected with an extrusion plate, a strip-shaped plate is fixedly arranged on the inner wall of the strip-shaped groove, and an electric telescopic rod is arranged in the strip-shaped plate.

[0008] Two supporting columns are arranged on one side of the two lifting bottom plates, two vertical plates with constraint short columns are fixedly connected to the surface of the supporting columns, a gear ring with an annular groove is arranged in the middle of the two vertical plates, a welding gun is arranged on the inner wall of the gear ring through an electric telescopic rod, the annular groove is connected with the constraint short column in a sliding mode, a driving motor is arranged on the surface of the supporting column, and a driving gear connected with the gear ring is arranged on the output end of the driving motor.

[0009] In the automatic welding device for petroleum chemical pipeline engineering, the cooperation of the ring piece, the constraint belt and the rack plate can distinguish and constrain the pipe with a conical cross section and the pipe with a straight cylinder, so as to ensure the accuracy and stability of the end alignment during pipe welding and ensure the welding quality.

[0010] As a further improvement of the present application, the circular rod in one of the supporting supports on each lifting bottom plate is rotatably connected to the inner wall of the supporting support through a self-recovery rotating shaft, and the other circular rod is fixedly connected to the supporting support, and the surface of one of the circular rods is wound with a constraint belt.

[0011] As a further improvement of the present application, a guide rail is arranged below each lifting bottom plate, a hydraulic lifting rod is slidably connected to the inside of the guide rail, the power end of the hydraulic lifting rod is connected to the bottom surface of the lifting bottom plate, a reciprocating screw rod is arranged on one side of the guide rail, and the surface of the reciprocating screw rod is connected to the surface of the hydraulic lifting rod through a threaded sleeve.

[0012] A supporting motor is arranged at the end of each guide rail, the output ends of the two supporting motors are respectively connected to the ends of the reciprocating screw rods, the rotating motor is designed as a double-output end, and each output end extends to the outside of the supporting support.

[0013] As a further improvement of the present application, the lowest end of the ring piece is located above the supporting support, and the horizontal distance between the electric telescopic rod and the rotating shaft is not greater than half of the length of the extrusion plate.

[0014] As a further improvement of the present application, a welding control system is further included, which comprises a welding driving module, a pipe alignment module, a constraint module and a conical restriction module for conical pipe constraint, the welding driving module is signal connected with a driving motor and an electric telescopic rod for driving the welding gun to adjust the distance for circumferential welding, the pipe alignment module is signal connected with a hydraulic lifting rod and a supporting motor for aligning the constrained pipe ends, the conical restriction module is signal connected with an electric telescopic rod for controlling the inclination of the extrusion plate to fit and extrude the surface of the conical pipe, and the constraint module is signal connected with a rotating motor for driving the rack plate to constrain the pipe radially.

[0015] As a further improvement of the present application, a fixed motor is connected inside the guide rail, and the output end of the fixed motor is connected with the bottom of the hydraulic lifting rod, and the rack plate is replaced by an adjusting piece.

[0016] As a further improvement of the present application, the adjusting piece is two rack plates connected by a shaft rod, and each adjusting piece is connected with a guide rod at one end.

[0017] As a further improvement of the present application, the gap at the connection of the two rack plates is the same as the distance between two adjacent tooth grooves on the surface of the rack plate, and the diameter of the shaft rod is smaller than the thickness of the rack plate.

[0018] As a further improvement of the present application, a welding method of the automatic welding equipment for petroleum and chemical pipeline engineering is provided, and the working steps are as follows

[0019] S1, before welding the two pipe ends, the categories of the two pipes to be welded are determined, if the two pipes are of the same diameter, the constraint belt and the rack plate can be used to constrain and stabilize the two pipes of the same diameter;

[0020] S2, if there is a conical pipe among the two pipes, the ring piece, the electric telescopic rod and the extrusion plate are used in cooperation to strengthen the constraint and extrusion of the conical pipe;

[0021] S3, if there is an arc-shaped pipe among the two pipes, the arc-shaped pipe is first deflected, the two rotating motors, the adjusting piece and the constraint belt are used in cooperation to realize the constraint of the arc-shaped pipe, and then the fixed motor is rotated to align the end of the deflected arc-shaped pipe with the end of the straight cylindrical pipe;

[0022] S4, after the constraint is completed, welding operation is performed.

[0023] In summary, by utilizing the coordination of ring parts, restraint belts, rack plates, adjustment parts and guide rods, pipes with tapered cross-sections, arc-shaped pipes and straight-cylinder-shaped pipes can be differently constrained, thereby ensuring the accuracy and stability of the end alignment during pipe welding, thereby ensuring the welding quality and cooperating with the ring parts, drive motor and electric telescopic rod to achieve circumferential welding operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of this application;

[0025] Figure 2 This is an installation diagram of the gear ring component, ring component, lifting base plate and guide rail of the first embodiment of this application;

[0026] Figure 3 For this application Figure 2 A is an enlarged schematic diagram;

[0027] Figure 4 This is an installation diagram of the servo motor, rotating bracket and lifting base plate of the first embodiment of this application;

[0028] Figure 5 For this application Figure 4 A magnified schematic diagram of point B in FIG.

[0029] Figure 6 This is a schematic diagram of the internal structure of the ring member according to the first embodiment of the present application;

[0030] Figure 7 This is a diagram showing the alignment of a straight tube and a tapered tube according to the first embodiment of the present application;

[0031] Figure 8 This is a diagram of the alignment state of a straight cylindrical pipe and a straight cylindrical pipe according to the first embodiment of the present application;

[0032] Figure 9 This is an installation diagram of the guide rod, the adjustment member, and the fixed motor according to the second embodiment of the present application;

[0033] Figure 10 This is a diagram of the constraint state of the arc-shaped pipe in the second embodiment of the present application, which is achieved by using the constraint belt in a non-deflected state;

[0034] Figure 11 This is a state diagram of the arc-shaped pipe in the second embodiment of the present application being aligned with the end of the straight-cylindrical pipe with the cooperation of the guide rod, the adjustment member and the fixed motor.

[0035] Description of the numbers in the figure:

[0036] 1 guide rail; 2 hydraulic lifting rod; 3 reciprocating screw rod; 4 drive gear; 5 support column; 6 lifting base plate; 7 drive motor; 8 gear ring; 9 ring; 91 extrusion plate; 92 electric telescopic rod; 93 strip-shaped groove; 10 round rod; 11 constraint stub; 12 rotating motor; 13 rotating gear; 14 rack plate; 15 welding gun; 16 electric telescopic rod; 17 rotating support; 18 servo motor; 19 guide rod; 20 fixed motor; 21 adjusting piece. DETAILED DESCRIPTION

[0037] The three embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0038] First embodiment:

[0039] Figures 1-5 An automatic welding device for petrochemical pipeline engineering is shown, comprising two lifting base plates 6, the top of each lifting base plate 6 is provided with two symmetrically arranged support supports, the inside of each support support is provided with a round rod 10 and a rotating motor 12 located below the round rod 10, and the output end of the rotating motor 12 is connected with a rotating gear 13, and the top surface of the lifting base plate 6 is slidingly connected with a rack plate 14 engaged with the rotating gear 13.

[0040] The round rod 10 in one of the support supports on each lifting base plate 6 is rotatably connected to the inner wall of the support support through a self-recovery rotating shaft, and the other round rod 10 is fixedly connected to the support support, and a constraint belt is wound around the surface of one of the round rods 10.

[0041] The bottom of each lifting base plate 6 is provided with a guide rail 1, the inside of the guide rail 1 is slidingly connected with a hydraulic lifting rod 2, and the power end of the hydraulic lifting rod 2 is connected with the bottom surface of the lifting base plate 6, one side of the guide rail 1 is provided with a reciprocating screw rod 3, and the surface of the reciprocating screw rod 3 is connected with the surface of the hydraulic lifting rod 2 through a threaded sleeve.

[0042] One end of each guide rail 1 is provided with a support motor, and the output ends of the two support motors are respectively connected with the ends of the reciprocating screw rod 3, the rotating motor 12 is designed as a double-output end, and each output end extends to the outside of the support support.

[0043] One side of the two lifting base plates 6 is provided with a support column 5, the surface of the support column 5 is provided with two vertical plates fixedly connected with constraint stubs 11, the middle of the two vertical plates is provided with a gear ring 8 provided with an annular groove, the inner wall of the gear ring 8 is provided with a welding gun 15 through an electric telescopic rod 16, the annular groove is slidingly connected with the constraint stub 11, the surface of the support column 5 is provided with a drive motor 7, and the output end of the drive motor 7 is connected with a drive gear 4 engaged with the gear ring 8.

[0044] Specifically, when welding two pipes with the same diameter, the pipes are first placed in the middle of the surface of the lifting base 6, then the restraint belt is wound around the top of the pipe, and then the belt is fixed on the surface of the circular rod 10 connected with the support bracket (knotting or other fixing methods can be used), thereby restraining the pipe. Then the rotating motor 12 is started, so that the two rack plates 14 on both sides of the surface of the lifting base 6 are close to each other, thereby abutting against the surface of the pipe. The above two restraint operations can enhance the restraint of the pipe.

[0045] After the pipe is restrained, the support motor is started to drive the two hydraulic lifting rods 2 and the pipe in the restrained state on the surface of the lifting base 6 to move close to each other. In this process, the hydraulic lifting rod 2 is used to adjust the lifting height of the pipe, so that the center of the pipe in the restrained state and the center of the gear ring 8 are on the same axis (because the middle of the lifting base 6 and the center of the gear ring 8 are on the same straight line, the height of the pipe can be adjusted to make the annular weld formed by the butt joint of the two pipes and the gear ring 8 concentric, as shown in Figure 8

[0046] When the two pipes move to the position of the gear ring 8, the support motor is turned off and the electric telescopic rod 16 is used to adjust the position of the welding gun 15 to the butt joint of the pipes. Then the driving motor 7 is started, and the driving gear 4 and the gear ring 8 are engaged to drive the gear ring 8 and the welding gun 15 to move around the butt joint of the pipes, thereby realizing the circumferential welding operation.

[0047] When the welding gun 15 is circumferentially welded, because of the design of the annular groove and the restraint stub 11, the gear ring 8 always remains suspended on one side of the driving gear 4 and engaged with the driving gear 4 during rotation, thereby ensuring the circumferential rotation of the gear ring 8.

[0048] Figure 6 As shown, one side of the lifting base 6 is provided with a servo motor 18, the output end of the servo motor 18 is connected with a rotating bracket 17, the surface of the rotating bracket 17 is connected with a ring 9 through a cross bar, the inside of the ring 9 is provided with a plurality of annularly arranged strip grooves 93, the inner wall of the strip groove 93 is rotatably connected with an extrusion plate 91 through a self-rebound rotating shaft, the inner wall of the strip groove 93 is fixedly connected with a strip plate, the inside of the strip plate is penetratively connected with an electric telescopic rod 92, the lowest end of the ring 9 is located above the support bracket, and the horizontal distance between the electric telescopic rod 92 and the rotating shaft is not greater than half of the length of the extrusion plate 91.

[0049] ​Also included is a welding control system, which includes a welding drive module, a pipe alignment module, a constraint module, and a conical restriction module for restricting the conical pipe, the welding drive module is signal connected with the drive motor 7 and the electric telescopic rod 16, used to drive the welding torch 15 to adjust the distance and circumferentially weld, the pipe alignment module is signal connected with the hydraulic lifting rod 2 and the support motor, used to close and align the end of the restricted pipe, the conical restriction module is signal connected with the electric telescopic rod 92, used to control the inclination degree of the extrusion plate 91, so that it is fitted and extruded to restrict the surface of the conical pipe, the constraint module is signal connected with the rotating motor 12, used to drive the rack plate 14 to radially constrain the pipe.

[0050] Specifically, when welding the ends of two pipes with different diameters, because of the diameter difference, a pipe with a conical cross section needs to be butt-jointed, and then welded at the end of the butt joint, so as to realize the welding operation between pipes with different diameters (in this embodiment, the pipe with larger diameter is referred to as c, the pipe with a conical cross section is referred to as b, and the pipe with smaller diameter is referred to as a, hereinafter referred to as c pipe, b pipe and a pipe).

[0051] When the b pipe is constrained, the constraint effect of the constraint belt and the rack plate 14 is limited (because the cross section is conical, the constraint area of the constraint belt and the rack plate 14 is limited, and thus the constraint effect is poor), so the ring 9 is used for processing.

[0052] When the b pipe is constrained, the servo motor 18 can be started first to drive the rotating support 17 to rotate, so that the ring 9 is shifted to the right side of the gear ring 8, and then the b pipe is sequentially threaded through the gear ring 8 and the ring 9 from left to right (in this state, the diameter of the left side of the b pipe is the same as that of the a pipe, and the diameter of the right side of the b pipe is the same as that of the c pipe, if it is reversed, the threading direction of the b pipe is opposite), until the surface of the b pipe is in contact with the inner wall surface of the ring 9, and then the electric telescopic rod 92 is started to drive the extrusion plate 91 to deflect downward, until the extrusion plate 91 extrudes and overlaps on the surface of the b pipe (as shown in FIG. Figure 7 After the constraint contact area with the b pipe is increased and the constraint effect is enhanced, the support motor is used to sequentially align the ends of the a pipe, the b pipe and the c pipe, and then welding can be performed.

[0053] In addition, the distance between the installation position of the electric telescopic rod 92 and the end of the extrusion plate 91 is designed, so that the electric telescopic rod 92 can drive the extrusion plate 91 to deflect by a large angle after a small distance is extended, so as to adapt to the constraint requirements of b pipes of various sizes.

[0054] Second embodiment:

[0055] Figure 9The inner rail 1 is connected with a fixed motor 20, and the output end of the fixed motor 20 is connected with the bottom of the hydraulic lifting rod 2, and the rack plate 14 is replaced by an adjusting part 21.

[0056] The adjusting part 21 is connected by a shaft, and each adjusting part 21 is connected with a guide rod 19.

[0057] The gap at the connecting part of the two rack plates 14 is the same as the distance between the two adjacent tooth grooves on the surface of the rack plate 14, and the diameter of the shaft is smaller than the thickness of the rack plate 14.

[0058] Different from the first embodiment, the present embodiment is mainly aimed at two pipes with the same diameter to be welded, but one of the pipes is designed as a straight cylinder, and the other pipe is designed as a circular arc, so that the welded pipe can realize the reversing operation of the pipeline. In the present embodiment, the pipe designed as a straight cylinder is referred to as e-pipe, and the pipe designed as a circular arc is referred to as d-pipe, and hereinafter referred to as e-pipe and d-pipe. In the present embodiment, the surface of the hydraulic lifting rod 2 is connected with the threaded sleeve on the surface of the reciprocating screw rod 3 through a shaft sleeve (and the shaft sleeve is installed on the surface of the fixed end of the hydraulic lifting rod 2), so that when the fixed motor 20 drives the hydraulic lifting rod 2 to rotate, it will not be affected by the threaded sleeve, and with the rotation of the reciprocating screw rod 3, the movement can be smoothly driven. Since the bottom of the fixed motor 20 is connected with the inner part of the rail 1 through the ball, the friction between the fixed motor 20 and the rail 1 is small, and there is no too much interference, so that the lifting bottom plate 6 can realize the rotation and lifting operation at the same time.

[0059] Specifically, when the d-pipe is constrained by the constraint belt and the rack plate 14, it is found that the contact of the rack plate 14 on one side with the surface of the d-pipe is unstable, and the binding effect of the constraint belt is asymmetric (as shown in Figure 10 ). This kind of constraint effect is not good, so the present embodiment is adopted.

[0060] As shown in Figure 11As shown, when the d pipeline is constrained, the d pipeline can be deflected by 45 degrees (at this time, the d pipeline is close to the side of the non-fixed connection of the support bracket of the upper circular rod 10 of the lifting base plate 6, and the specific placement position is adjusted according to the actual size), then the rotating motor 12 is used to drive the adjusting part 21 away from the smaller curved surface to move close to the d pipeline, then the constraint belt is pulled to pass over the top surface of the d pipeline, and then the end of the constraint belt is constrained on the surface of the fixed connection of the circular rod 10 (at this time, the position of the guide rod 19 is located directly below the tangent plane of the larger curved surface of the d pipeline, so that the constraint contact area of the constraint belt on the d pipeline is larger after the constraint belt is wound through the d pipeline and the guide rod 19), and finally the other rotating motor 12 on the lifting base plate 6 is started to drive the adjusting part 21 connected therebetween to move close to the d pipeline, and the constraint operation of the d pipeline is performed in cooperation with the first adjusting part 21. Through the above operation, the constraint contact area of the constraint belt on the surface of the d pipeline can be increased, and the stable constraint of the d pipeline can be realized.

[0061] After the d pipeline is constrained, the e pipeline is constrained in a conventional manner (see the first embodiment), and then the fixed motor 20 is used to drive the d pipeline in a constrained state to rotate (the specific rotation angle is adjusted according to the actual size), so that one end of the d pipeline in a constrained state is aligned with the end of the e pipeline, and then subsequent circumferential welding operation is performed.

[0062] Third embodiment:

[0063] A welding method of an automatic welding device for petroleum and chemical pipeline engineering, and the working steps are as follows:

[0064] S1, before welding the two pipeline ends, the categories of the two pipelines to be welded are determined, if the two pipelines are equal in diameter, the constraint belt and the rack plate 14 can be used to constrain and stabilize the two pipelines equal in diameter;

[0065] S2, if there is a conical pipeline among the two pipelines, the ring part 9, the electric extension rod 92 and the extrusion plate 91 are used in cooperation to strengthen the constraint and extrusion effect on the conical pipeline;

[0066] S3, if there is an arc-shaped pipeline among the two pipelines, the arc-shaped pipeline is deflected first, the two rotating motors 12, the adjusting part 21 and the constraint belt are used in cooperation to realize the constraint of the arc-shaped pipeline, and then the fixed motor 20 is used to rotate to align the end of the deflected arc-shaped pipeline with the end of the straight cylinder-shaped pipeline;

[0067] S4, after the constraint is completed, the welding operation is performed.

[0068] In summary, when welding two pipes with the same diameter, the conventional constraint treatment can be performed by using the constraint belt and the rack plate 14. When aligning the straight tube and the conical pipe, the surface of the conical pipe can be effectively constrained by using the cooperation of the electric telescopic rod 92 and the extrusion plate 91, and then the straight tube is aligned with the conventional constraint treatment. When aligning the straight tube and the symmetrical circular arc pipe, the circular arc pipe needs to be first deflected, then stably constrained, and finally rotated and aligned by using the cooperation of the guide rod 19, the adjusting piece 21, the fixed motor 20, and the constraint belt, so as to realize the end alignment of the straight tube and the circular arc pipe. After alignment, the circumferential welding of the end of the pipe after alignment can be performed by using the cooperation of the gear ring piece 8, the driving motor 7, and the electric telescopic rod 16, so that the welding gun 15 can perform the circumferential welding on the end of the pipe after alignment.

[0069] In combination with the current actual demand, the above-mentioned embodiments of the present application are not limited to the scope, and various changes made within the knowledge of those skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. An automatic welding device for petrochemical pipeline engineering, comprising two supporting base plates (6), characterized in that: Two symmetrically arranged support brackets are installed on the top of each of the lifting base plates (6), a round rod (10) and a rotating motor (12) located below the round rod (10) are installed inside each of the support brackets, and the output end of the rotating motor (12) is connected to a rotating gear (13), and the top surface of the lifting base plate (6) is slidably connected to a rack plate (14) meshing with the rotating gear (13); A servo motor (18) is installed at the bottom of one side of one of the lifting base plates (6), and the output end of the servo motor (18) is connected to a rotating bracket (17). The surface of the rotating bracket (17) is connected to a ring member (9) via a cross bar. The inside of the ring member (9) is provided with a plurality of strip grooves (93) arranged in an annular manner. An extrusion plate (91) is rotatably installed on the inner wall of the strip groove (93) via a self-rebounding rotating shaft. A strip plate is fixedly installed on the inner wall of the strip groove (93), and an electric extension rod (92) is installed through the inside of the strip plate. A support column (5) is installed on one side of the two lifting base plates (6), and two vertical plates with restraining short columns (11) fixedly connected to the surface are installed on the surface of the support column (5). A gear ring member (8) with an annular groove on the surface is arranged in the middle of the two vertical plates. A welding gun (15) is installed on the inner wall of the gear ring member (8) through an electric telescopic rod (16). The annular groove is slidably connected to the restraining short column (11). A driving motor (7) is installed on the surface of the support column (5), and the output end of the driving motor (7) is connected to a driving gear (4) meshing with the gear ring member (8); A guide rail (1) is arranged below each lifting base plate (6), the guide rail (1) is internally slidably connected to a hydraulic lifting rod (2), and the power end of the hydraulic lifting rod (2) is connected to the bottom surface of the lifting base plate (6), and a reciprocating screw rod (3) is installed on one side of the guide rail (1), and the surface of the reciprocating screw rod (3) is connected to the surface of the hydraulic lifting rod (2) through a threaded sleeve; The guide rail (1) is internally connected to a fixed motor (20) in a rolling manner, and the output end of the fixed motor (20) is connected to the bottom of the hydraulic lifting rod (2), and the rack plate (14) is replaced by an adjusting member (21); The adjusting member (21) is composed of two rack plates (14) connected by a shaft, and one end of each adjusting member (21) is connected to a guide rod (19); The gap at the connection between the two rack plates (14) is the same as the distance between two adjacent tooth grooves on the surface of the rack plate (14), and the diameter of the shaft is smaller than the thickness of the rack plate (14).

2. The automatic welding equipment for petrochemical pipeline engineering according to claim 1, characterized in that: The round rod (10) in one of the support brackets on each lifting base plate (6) is rotatably connected to the inner wall of the support bracket via a self-returning rotation axis, and the other round rod (10) is fixedly connected to the support bracket, and a restraining belt is wrapped around the surface of one of the round rods (10).

3. The automatic welding equipment for petrochemical pipeline engineering according to claim 2, characterized in that: A supporting motor is arranged at one end of each guide rail (1), and the output ends of the two supporting motors are respectively connected to the ends of the reciprocating screw rod (3). The rotating motor (12) is designed with dual output ends, and each output end extends to the outside of the supporting bracket.

4. The automatic welding equipment for petrochemical pipeline engineering according to claim 3, characterized in that: The lowest end of the ring member (9) is located above the support bracket, and the horizontal distance between the electric extension rod (92) and the rotating shaft is no greater than half the length of the extrusion plate (91) itself.

5. The automatic welding equipment for petrochemical pipeline engineering according to claim 4, characterized in that: The invention also includes a welding control system, which includes a welding drive module, a pipeline alignment module, a constraint module and a conical constraint module for constraining the conical pipeline. The welding drive module is connected to the drive motor (7) and the electric telescopic rod (16) by signal, and is used to drive the welding gun (15) to adjust the distance and then weld circumferentially. The pipeline alignment module is connected to the hydraulic lifting rod (2) and the support motor by signal, and is used to bring the constrained pipeline ends closer and align. The conical constraint module is connected to the electric telescopic rod (92) by signal, and is used to control the inclination of the extrusion plate (91) so that it fits the surface of the conical pipeline and constrains it by extrusion. The constraint module is connected to the rotating motor (12) by signal, and is used to drive the rack plate (14) to radially constrain the pipeline.

6. A welding method for an automatic welding device for petrochemical pipeline engineering according to any one of claims 1 to 5, characterized in that: The working steps are as follows: S1. Before welding the ends of two pipes, determine the types of the two pipes to be welded. If the two pipes have the same diameter, the two pipes with the same diameter can be constrained and stabilized by using a restraining belt and a rack plate (14); S2. If there is a conical pipe in the two pipes, the ring member (9), the electric extension rod (92) and the extrusion plate (91) are used to strengthen the restraining and extruding effect on the conical pipe; S3. If one of the two pipes has an arc, the arc is first deflected, and the two rotating motors (12), the adjusting member (21), and the restraining belt are used to restrain the arc, and then the fixed motor (20) is rotated to align the end of the deflected arc with the end of the straight pipe. S4. After the constraint is completed, welding operation is performed.

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