Petroleum pipeline welding method and welding device

Abstract

The invention discloses a petroleum pipeline welding method and device, and relates to the technical field of petroleum pipeline machining.The petroleum pipeline welding method comprises the steps that a plurality of short pipes are fixed, and the ends of every two adjacent short pipes are in butt joint; one side of the butt joint of every two adjacent short pipes is sleeved with a sleeve; the butt joint positions of the short pipes are welded in sequence; after the butt joint of every two adjacent short pipes is welded, the butt joint is covered with the sleeve; the two ends of the sleeve are welded to the corresponding short pipes correspondingly; after welding between the two ends of the sleeve and the corresponding short pipes is completed, welding of the petroleum pipeline is completed; the sleeve sleeves the weld joint between the adjacent short pipes, the two ends of the sleeve are welded to the two short pipes, the butt joint of the adjacent short pipes is protected through the sleeve, the probability of weld joint breakage is reduced, and the strength of the butt joint of the adjacent short pipes is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pipeline processing, in particular to an oil pipeline welding method and a welding device. Background Art

[0002] Petroleum is a viscous, dark brown liquid known as the "blood of industry." Petroleum is found in parts of the upper crust. Its primary components are a mixture of various alkanes, cycloalkanes, and aromatic hydrocarbons. It is a primary target of geological exploration. Once extracted, it must be transported over long distances via pipelines.

[0003] During the production and processing of oil pipelines, multiple short pipes must be welded sequentially to increase the length of the pipeline. Conventional welding methods typically involve directly butting the short pipes together and then welding the joints. Because welding is performed only at the joints of the short pipes without any other treatment, the welds have low strength and a high probability of fracture.

[0004] In view of this, there is an urgent need for a petroleum pipeline welding method and a welding device to solve the defects in the prior art. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention solves the problem with the following technical structure.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A petroleum pipeline welding method, the method comprising: Fix several short tubes so that the ends of two adjacent short tubes are butted together; A sleeve is provided on one side of the joint between two adjacent short pipes; Weld the short pipe joints in sequence; After the butt joints of two adjacent short pipes are welded, the sleeve is placed over the butt joints; Welding the two ends of the sleeve to the corresponding short pipes respectively; When the welding between the two ends of the sleeve and the corresponding short pipes is completed, the welding of the oil pipeline is completed.

[0007] The sequential welding of the butt joints of the short tubes comprises: firstly performing laser wire welding on the butt joints of two adjacent short tubes, and then performing argon arc welding on the welds in a circumferential direction.

[0008] including a number of positioning rods; The method of connecting the ends of two adjacent short tubes includes: setting a plurality of positioning holes at the ends of the short tubes, setting the positioning rods in the positioning holes when fixing the two adjacent short tubes, and inserting the two ends of the positioning rods into the positioning holes of the two adjacent short tubes respectively.

[0009] It includes an insertion rod, which is adapted to the inner cavity of the short tube; The method of docking the ends of two adjacent short tubes includes: first fixing one of the short tubes, inserting one end of the insertion rod into the fixed short tube, then sleeve the other short tube on the insertion rod and move it toward the side of the fixed short tube until the two short tubes dock, fixing the other short tube, and then pulling out the insertion rod.

[0010] A petroleum pipeline welding device, applied to the above-mentioned petroleum pipeline welding method, is characterized by comprising: a frame, on which a driving mechanism, an ejector mechanism, a welding mechanism, and a plurality of fixing mechanisms are provided; The plurality of fixing mechanisms are sequentially arranged along a straight line, and the fixing mechanisms are used to fix the short tube so that the short tube is in a horizontal state; The welding mechanism is slidably arranged on one side of the plurality of fixing mechanisms, and is used for welding the short pipe; The driving mechanism includes a driving member and a clamping assembly, wherein the clamping assembly and the ejector mechanism are respectively arranged on one side of the two outermost fixing mechanisms that are away from each other, the clamping assembly is used to clamp the short tubes on the adjacent fixing mechanisms, and the driving member is used to drive the clamping assembly to rotate; The ejector mechanism is used to apply a thrust toward one side of the clamping assembly to the short tube on the adjacent fixing mechanism.

[0011] The frame is provided with a first slide rail extending along a straight line, and the plurality of fixing mechanisms are all slidably provided on the first slide rail; The ejector mechanism includes a sliding seat and an ejector, the sliding seat is arranged on the first slide rail, and the ejector is horizontally rotatably arranged on a side of the sliding seat close to the fixing mechanism.

[0012] The fixing mechanism includes a first mounting seat, a supporting platform, a cover plate, a first fixing assembly and a limiting assembly. The first mounting seat is slidably set on the first slide rail. The first fixing assembly is used to lock the first mounting seat on the first slide rail. The supporting platform is set on the top of the first mounting seat. A supporting groove with an upward opening is set on the supporting platform. A limiting groove is set on the cover plate. The limiting assembly is used to fix the cover plate on the supporting platform so that the opening of the limiting groove is opposite to the opening of the supporting groove.

[0013] A plurality of rollers are provided on the supporting platform and the cover plate, and the circumferential directions of the plurality of rollers extend into the supporting groove or the limiting groove.

[0014] The two ends of the cover plate are respectively a rotating end and a free end. A first rotating shaft is provided on the supporting platform. The rotating end is provided on the first rotating shaft. The limiting component is used to fix the free end on the supporting platform.

[0015] The limiting assembly includes a limiting bolt. A rotating member is provided on the supporting platform. The limiting bolt is threadedly connected to the rotating member. A U-shaped slot is provided at the free end.

[0016] The above structure of the present invention can achieve the following beneficial effects: By installing a sleeve at the weld between adjacent short pipes and welding the two ends of the sleeve to the two short pipes, the sleeve protects the joints of adjacent short pipes, reduces the probability of weld breakage, and improves the strength of the joints of adjacent short pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the first embodiment; Figure 2 for Figure 1 A schematic diagram of the structure at center A; Figure 3 Schematic diagram of the structure of the driving mechanism in the first embodiment; Figure 4 Schematic diagram of the structure of the ejector mechanism in the first embodiment; Figure 5 This is a schematic structural diagram of the adjacent fixing mechanisms in the first embodiment when used in conjunction with each other; Figure 6 Schematic diagram of the structure of the fixing mechanism in the first embodiment; Figure 7 This is a structural diagram of the fixing mechanism in the first embodiment from another perspective; Figure 8 This is a structural diagram of the supporting platform in the first embodiment; Figure 9 Schematic diagram of the structure of the heating mechanism in the first embodiment; Figure 10 Schematic diagram of the structure of the length measuring mechanism in the first embodiment; Figure 11 This is a schematic structural diagram of the short tube in the second embodiment.

[0018] In the figure: 1. frame; 2. driving mechanism; 21. driving member; 22. clamping assembly; 3. ejector mechanism; 31. sliding seat; 32. ejector; 4. fixing mechanism; 41. first mounting seat; 411. positioning groove; 42. supporting platform; 421. supporting groove; 422. supporting plate; 423. first rotating shaft; 424. second rotating shaft; 43. cover plate; 431. limiting groove; 432. pressure plate; 44. roller; 45. limiting bolt; 46. rotating member; 47. slot; 48. fixing plate; 49. fixing bolt; 5. track plate; 51. positioning strip; 6. limiting plate; 61. limiting hole; 7. limiting column; 8. heating mechanism; 81. second mounting seat; 82. thermal insulation pad; 83. heating plate; 9. length measuring mechanism; 91. measuring head; 100. sleeve. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or equipment.

[0021] The following is combined with Figure 1-11 This application is described in further detail.

[0022] Example 1, reference Figure 1-Figure 3The oil pipeline welding device shown in the figure comprises: a frame 1, on which a driving mechanism 2, an ejector mechanism 3, a welding mechanism and several fixing mechanisms 4 are provided (the specific number is adaptively adjusted according to the processing requirements. In this embodiment, 9 are preferably provided, that is, 9 short pipes are welded simultaneously); the several fixing mechanisms 4 are arranged in sequence along a straight line, and the fixing mechanisms 4 are used to fix the short pipes so that the short pipes are in a horizontal state; the welding mechanism is slidably arranged on one side of the several fixing mechanisms 4 (the welding mechanism is driven to slide on one side of the several fixing mechanisms 4 by a driving member, which is not shown in the drawings), and the welding mechanism is used to weld the short pipes; the driving mechanism 2 comprises a driving member 21 and a clamping assembly 22, and the clamping assembly 22 and the ejector mechanism 3 are respectively arranged on the side of the two outermost fixing mechanisms 4 away from each other, the clamping assembly 22 is used to clamp the short pipes on the adjacent fixing mechanisms 4, and the driving member 21 is used to drive the clamping assembly 22 to rotate; the ejector mechanism 3 It is used to apply a thrust toward the clamping assembly 22 to the short tubes on the adjacent fixing mechanisms 4; in this way, during processing, each fixing mechanism 4 fixes a short tube, and the clamping assembly 22 clamps the end of an adjacent short tube, and the ejector mechanism 3 applies a thrust toward the clamping assembly 22 to the short tube, so that the ends of the short tubes on the several fixing mechanisms 4 fit together, and due to the consistency of the support heights of the several fixing mechanisms 4, the short tubes on the several fixing mechanisms 4 are coaxial; then the welding mechanism welds the butt joints between adjacent short tubes in turn, and at the same time, the driving assembly 21 drives the clamping assembly 22 to rotate, so that the short tubes being welded rotate synchronously in the same direction, and the welding mechanism welds the butt joints in a circumferential direction in turn until the welding of the short tubes on the several fixing mechanisms 4 is completed, so that the several short tubes form a long oil pipeline, and several short tubes are fixed at one time before welding to ensure that the several short tubes are coaxially arranged, which is beneficial to improving the coaxiality of the several short tubes and improving the welding efficiency of the oil pipeline.

[0023] like Figure 1 and Figure 2 As shown, in order to facilitate the adjustment of the position of the fixing mechanism 4, a first slide rail extending along a straight line is provided on the frame 1, and several fixing mechanisms 4 are slidably set on the first slide rail. In this embodiment, the first slide rail is composed of two parallel track plates 5, and the sides of the two track plates 5 close to each other are both suspended. According to the welding requirements, the fixing mechanism 4 is made to slide on the two track plates 5, and the distance between adjacent fixing mechanisms 4 is adjusted to adapt to the welding of short tubes of different lengths.

[0024] like Figure 4As shown, in order to position the multiple short tubes in the axial direction, the ejector mechanism 3 includes a sliding seat 31 and an ejector 32. The sliding seat 31 is arranged on the first slide rail, and the ejector 32 is horizontally rotatably arranged on the side of the sliding seat 31 close to the fixing mechanism 4. In this way, the sliding seat 31 is pushed to slide on the first slide rail, so that the ejector 32 is pressed against the end of an adjacent short tube, so that the ends of the multiple short tubes are fitted together, and then the sliding seat 31 is locked on the first slide rail. When the driving assembly 21 drives the short tube to rotate, the ejector 32 rotates relative to the sliding seat 31. A motor can also be set on the sliding seat 31 to make the clamping assembly 22 and the ejector 32 rotate synchronously, so that the short tubes on both sides rotate synchronously.

[0025] like Figure 5-Figure 8 As shown, the fixing mechanism 4 includes a first mounting seat 41, a supporting platform 42, a cover plate 43, a first fixing assembly and a limiting assembly. The first mounting seat 41 is slidably arranged on the first slide rail. The first fixing assembly is used to lock the first mounting seat 41 on the first slide rail. The supporting platform 42 is arranged on the top of the first mounting seat 41. A supporting groove 421 with an upward opening is provided on the supporting platform 42. A limiting groove 431 is provided on the cover plate 43. The limiting assembly is used to fix the cover plate 43 on the supporting platform 42 so that the opening of the limiting groove 431 is opposite to the opening of the supporting groove 421. The short tube is supported by the supporting platform 42, and the cover plate 43 is fixed to the supporting platform 42 through the limiting component to limit the radial direction of the short tube and complete the fixation of the position of the short tube, and the first mounting seat 41 is slidably set on the two track plates 5 to facilitate the adjustment of the position of the supporting platform 42; and, a number of rollers 44 are provided on the supporting platform 42 and the cover plate 43, and the circumferential extension of the number of rollers 44 is into the supporting groove 421 or the limiting groove 431; the short tube is in contact with the number of rollers 44, so that the short tube can be rotated to perform circumferential welding on the joints of adjacent short tubes.

[0026] like Figure 6 and Figure 7 As shown, the two ends of the cover plate 43 are respectively a rotating end and a free end. A first rotating shaft 423 is provided on the support platform 42, and the rotating end is provided on the first rotating shaft 423. The limiting component is used to fix the free end on the support platform 42; the limiting component includes a limiting bolt 45, and a rotating member 46 is provided on the support platform 42. The limiting bolt 45 is threadedly connected to the rotating member 46, and a U-shaped card slot 47 is provided at the free end. In this way, the cover plate 43 rotates on the support platform 42 so as not to block the support slot 42. 1, so that the short tube can be placed on the support platform 42 or removed from the support platform 42. The setting of the limiting bolt 45 allows the cover plate 43 to be closed on the support platform 42, and the rotating member 46 is rotated relative to the support platform 42 (rotated in a direction perpendicular to the horizontal plane) to allow the limiting bolt 45 to enter the groove 47. Then, the limiting bolt 45 is rotated so that the nut of the limiting bolt 45 is locked on the side of the groove 47 away from the support platform 42, thereby fixing the cover plate 43 on the support platform 42.

[0027] like Figure 7 As shown, in order to make the first mounting seat 41 slide on the two track plates 5 and to facilitate locking at a certain point of the track plate 5, the first fixing assembly includes a fixing plate 48 and a plurality of fixing bolts 49. The fixing plate 48 is fixed to the bottom of the first mounting seat 41 by a plurality of fixing bolts 49. The sides of the two track plates 5 close to each other are both arranged between the fixing plate 48 and the first mounting seat 41. When it is necessary to adjust the position of the first mounting seat 41, the plurality of fixing bolts 49 are screwed to increase the distance between the first mounting seat 41 and the fixing plate 48 so that the first mounting seat 41 can slide on the track plate 5. When it is necessary to lock the position of the first mounting seat 41, the plurality of fixing bolts 49 are screwed in the opposite direction so that the fixing plate 48 and the first mounting seat 41 are clamped and fixed to the upper and lower sides of the track plate 5 to complete the locking of the position of the first mounting seat 41.

[0028] Further optimization is, Figure 2 As shown, a track plate 5 is provided with a positioning bar 51, and the positioning bar 51 is consistent with the extension direction of the track plate 5. The bottom of the first mounting seat 41 is provided with a positioning groove 411 adapted to the positioning bar 51. In this way, the positioning groove 411 is clamped on the positioning bar 51, thereby positioning and limiting the position of the first mounting seat 41 in the second direction (the second direction is perpendicular to the extension direction of the first slide rail), and positioning and limiting the position perpendicular to the direction of the first slide rail to ensure that the short tubes on several fixing mechanisms 4 are coaxial.

[0029] like Figure 6 As shown, in order to expand the supporting area for the short tube, a supporting plate 422 is provided on one side of the supporting platform 42. Correspondingly, a pressure plate 432 is provided on the same side of the cover plate 43 as the supporting plate 422. The pressure plate 432 cooperates with the supporting plate 422 to fix the short tube.

[0030] like Figure 6 and Figure 7 As shown, in order to limit the rotation angle of the cover 43, a second rotating shaft 424 is provided on one side of the support platform 42, a limiting plate 6 is provided on the second rotating shaft 424, and a straight-line limiting hole 61 is provided on the limiting plate 6. A limiting column 7 is provided on one side of the rotating end, and the limiting column 7 is clamped in the limiting hole 61; the axial direction of the first rotating shaft 423 is consistent with the axial direction of the second rotating shaft 424, and the axis of the first rotating shaft 423 does not coincide with the axis of the second rotating shaft 424. In this way, when the cover 43 rotates, the limiting column 7 slides in the limiting hole 61, and the end of the limiting hole 61 away from the second rotating shaft 424 is the movement limit position of the limiting column 7, that is, at this time, the cover 43 and the support platform 42 are at the maximum angle.

[0031] like Figure 5 and Figure 9As shown, a heating mechanism 8 is provided between two adjacent fixing mechanisms 4, and the heating mechanism 8 includes a second mounting seat 81, a thermal insulation pad 82, a heating plate 83 and a second fixing assembly. The second mounting seat 81 is slidably set on the first slide rail, and the second fixing assembly (the structure of the second fixing assembly is consistent with the structure of the first fixing assembly, and will not be repeated here) is used to lock the second mounting seat 81 on the first slide rail; the thermal insulation pad 82 is set at the top of the second mounting seat 81, and the heating plate 83 is set on the top of the thermal insulation pad 82. In order to improve welding efficiency and welding quality, a heating mechanism 8 is provided at the butt joint of two adjacent short pipes, and heating is performed by the heating mechanism 8 to increase the temperature of the butt joint to facilitate welding; and reduce the cooling rate, prevent cracks, reduce welding stress and remove moisture.

[0032] like Figure 1 and Figure 10 As shown, a second slide rail is provided on one side of the first slide rail, and the second slide rail is provided parallel to the first slide rail. A length measuring mechanism 9 is provided on the second slide rail. The length measuring mechanism 9 is used to measure the distance between the two outermost short pipes on the sides away from each other. The length measuring mechanism 9 includes a length measuring sensor 91. The sensor 91 detects the side of the two outermost short pipes away from each other, thereby calculating the length of the entire oil pipeline.

[0033] Embodiment 2, a petroleum pipeline welding method, characterized by: Methods include: Fix several short tubes so that the ends of two adjacent short tubes are butted together; A sleeve 100 is provided on one side of the joint between two adjacent short pipes; Weld the short pipe joints in sequence; After the butt joints of two adjacent short pipes are welded, the sleeve 100 is placed over the butt joints. Welding the two ends of the sleeve 100 to the corresponding short tubes respectively; When the welding between the two ends of the sleeve 100 and the corresponding short pipes is completed, the welding of the oil pipeline is completed.

[0034] Combined with Implementation 1, specifically: Several short tubes are fixed by several fixing mechanisms 4 respectively, and a sleeve 100 is provided between two adjacent fixing mechanisms 4, and the sleeve 100 is sleeved on one of the short tubes; The clamping assembly 22 clamps the ends of adjacent short tubes, and the ejector mechanism 3 applies a thrust toward one side of the clamping assembly 22 to the short tubes on the adjacent fixing mechanism 4, so that the short tubes are connected in sequence; The welding mechanism welds the short pipe joints in sequence from the side close to the clamping assembly 22; while the welding mechanism is welding, the driving assembly 21 drives the clamping assembly 22 to rotate; After the welding of the butt joints of two adjacent short pipes is completed, several sleeves 100 are placed over the butt joints; The welding mechanism welds the two ends of the sleeves 100 to the corresponding short pipes respectively; while the welding mechanism is welding, the driving assembly 21 drives the clamping assembly 22 to rotate; When the welding between the two ends of the sleeve 100 and the corresponding short pipes is completed, the welding of the oil pipeline is completed.

[0035] By installing a sleeve 100 at the weld between adjacent short tubes and welding the two ends of the sleeve 100 to the two short tubes, the sleeve 100 protects the joints between adjacent short tubes, reducing the probability of weld breakage and improving the strength of the joints between adjacent short tubes.

[0036] Furthermore, considering that the weld seam has a high hardness and is prone to cracks after laser wire welding at the butt joint of the short tube, the welding mechanism includes a laser welding component and an argon arc welding component; The welding mechanism welds the short tube joints in sequence from the side close to the clamping assembly 22, including: first using a laser welding assembly to perform laser wire welding on the joints of two adjacent short tubes, and then using an argon arc welding assembly to perform argon arc welding on the weld in a circumferential direction, thereby reducing the hardness of the weld by argon arc welding, thereby reducing the probability of cracks in the weld.

[0037] Furthermore, since the coaxiality between adjacent short tubes needs to be ensured, the present application discloses two short tube positioning methods, one of which is: comprising a plurality of positioning rods; The connection between the ends of two adjacent short tubes includes: providing a plurality of positioning holes 200 (such as Figure 11 As shown), when fixing two adjacent short tubes, a positioning rod is set in the positioning hole 200, so that the two ends of the positioning rod are respectively inserted into the positioning holes 200 of the two adjacent short tubes. The positioning rod cooperates with the positioning holes 200 at the ends of the short tubes to complete the positioning of the radial positions of the adjacent short tubes.

[0038] The second is: including an insertion rod, the insertion rod is adapted to the inner cavity of the short tube; The method of docking the ends of two adjacent short tubes includes: first fixing one of the short tubes, inserting one end of the insertion rod into the fixed short tube, then sleeve the other short tube on the insertion rod, and move it toward the side of the fixed short tube until the two short tubes dock, fix the other short tube, and then pull out the insertion rod, ensuring the matching of the inner cavities of adjacent short tubes by the insertion rod, thereby positioning the radial positions of the adjacent short tubes.

[0039] The above are only preferred embodiments of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and variations directly derived or imagined by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the scope of protection of the present invention.

Claims

1. A petroleum pipeline welding method, characterized in that: Methods include: Fix several short tubes so that the ends of two adjacent short tubes are butted together; A sleeve (100) is provided on one side of the joint between two adjacent short pipes; Weld the short pipe joints in sequence; After the butt joints of two adjacent short pipes are welded, the sleeve (100) is placed over the butt joints; Welding the two ends of the sleeve (100) to the corresponding short tubes respectively; When the welding between the two ends of the sleeve (100) and the corresponding short pipes is completed, the welding of the oil pipeline is completed.

2. A petroleum pipeline welding method according to claim 1, characterized in that: The sequential welding of the butt joints of the short tubes comprises: firstly performing laser wire welding on the butt joints of two adjacent short tubes, and then performing argon arc welding on the welds in a circumferential direction.

3. A petroleum pipeline welding method according to claim 1, characterized in that: including a number of positioning rods; The method of butting the ends of two adjacent short tubes comprises: providing a plurality of positioning holes (200) at the ends of the short tubes; when fixing the two adjacent short tubes, providing the positioning rods in the positioning holes (200); and inserting the two ends of the positioning rods into the positioning holes (200) of the two adjacent short tubes.

4. A petroleum pipeline welding method according to claim 1, characterized in that: It includes an insertion rod, which is adapted to the inner cavity of the short tube; The method of docking the ends of two adjacent short tubes includes: first fixing one of the short tubes, inserting one end of the insertion rod into the fixed short tube, then sleeve the other short tube on the insertion rod and move it toward the side of the fixed short tube until the two short tubes dock, fixing the other short tube, and then pulling out the insertion rod.

5. A petroleum pipeline welding device, applied to the petroleum pipeline welding method according to claims 1-4, characterized in that: include: A frame (1), wherein the frame (1) is provided with a driving mechanism (2), an ejector mechanism (3), a welding mechanism, and a plurality of fixing mechanisms (4); A plurality of the fixing mechanisms (4) are arranged in sequence along a straight line, and the fixing mechanisms (4) are used to fix the short tube so that the short tube is in a horizontal state; The welding mechanism is slidably arranged on one side of the plurality of fixing mechanisms (4), and the welding mechanism is used to weld the short pipe; The driving mechanism (2) comprises a driving member (21) and a clamping assembly (22), wherein the clamping assembly (22) and the ejector mechanism (3) are respectively arranged on a side of the two outermost fixing mechanisms (4) that are away from each other, the clamping assembly (22) is used to clamp the short tube on the adjacent fixing mechanism (4), and the driving member (21) is used to drive the clamping assembly (22) to rotate; The ejector mechanism (3) is used to apply a thrust toward one side of the clamping assembly (22) to the short tube on the adjacent fixing mechanism (4).

6. The oil pipeline welding device according to claim 5, characterized in that: A first slide rail extending along a straight line is provided on the frame (1), and the plurality of fixing mechanisms (4) are all slidably provided on the first slide rail; The ejector mechanism (3) comprises a sliding seat (31) and an ejector (32), wherein the sliding seat (31) is arranged on the first slide rail, and the ejector (32) is horizontally rotatably arranged on a side of the sliding seat (31) close to the fixing mechanism (4).

7. The oil pipeline welding device according to claim 6, characterized in that: The fixing mechanism (4) includes a first mounting seat (41), a supporting platform (42), a cover plate (43), a first fixing component and a limiting component, wherein the first mounting seat (41) is slidably arranged on the first slide rail, and the first fixing component is used to lock the first mounting seat (41) on the first slide rail, the supporting platform (42) is arranged on the top of the first mounting seat (41), and a supporting groove (421) with an upward opening is provided on the supporting platform (42), and a limiting groove (431) is provided on the cover plate (43), and the limiting component is used to fix the cover plate (43) on the supporting platform (42) so that the opening of the limiting groove (431) is opposite to the opening of the supporting groove (421).

8. The oil pipeline welding device according to claim 7, characterized in that: A plurality of rollers (44) are provided on both the supporting platform (42) and the cover plate (43), and the plurality of rollers (44) extend circumferentially into the supporting groove (421) or the limiting groove (431).

9. The oil pipeline welding device according to claim 7, characterized in that: The two ends of the cover plate (43) are respectively a rotating end and a free end; a first rotating shaft (423) is provided on the support platform (42); the rotating end is provided on the first rotating shaft (423); and the limiting component is used to fix the free end on the support platform (42).

10. The oil pipeline welding device according to claim 9, characterized in that: The limiting assembly includes a limiting bolt (45), a rotating member (46) is provided on the supporting platform (42), the limiting bolt (45) is threadedly connected to the rotating member (46), and a U-shaped slot (47) is provided at the free end.

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