Rotary welding clamp for petrochemical pipeline

Abstract

The utility model discloses and provides a petrochemical pipeline spin welding clamp, which belongs to the technical field of pipeline welding, and comprises a left baffle plate and a right baffle plate, a pneumatic connecting rod type clamping mechanism and a rotating mechanism are respectively arranged on the symmetrical surfaces of the left baffle plate and the right baffle plate, the rotating mechanism comprises a central gear, and the central gear is arranged on a positioning shaft. The sun gear is connected with the mounting base through a bearing, the two sides of the sun gear are each meshed with a large gear, the two large gears are each meshed with a small gear, the two small gears are both meshed with the gear track, the two large gears and the two small gears are all connected with the mounting base through bearings, and the gear track is connected to the left baffle / right baffle through screws. The butt joint of the petrochemical pipeline is fixedly clamped through the pneumatic connecting rod type clamping mechanism, the clamping force serves as supporting force, the motor is used for driving the center gear, the gear again drives the large gear and the small gear to rotate in a meshed mode, and therefore the gear track is driven to rotate in the circumferential direction.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel construction, and specifically relates to a rotary welding fixture for petrochemical pipelines. Background Technique

[0002] Petrochemical pipelines transport flammable and explosive oil and gas. Therefore, during the welding process, the risks to be borne are very high, and quality and safety problems are likely to occur. Therefore, the welding process method is very important. (1) Welding methods and preparatory work for petrochemical pipelines

[0003] ① Welding method. For pipeline welding, argon arc welding is selected for backing welding and arc welding is used for surfacing. A good welding joint can be obtained, the repair rate can be reduced, and the project quality can be guaranteed. Manual arc welding is a welding method that melts metal using the arc heat between the welding object and the electrode. The scope of application of this welding method is relatively wide, and it can be welded in different positions such as indoors, outdoors, horizontally, and vertically. This has become the main method in pressure pipeline welding methods.

[0004] ② Preparatory work. Due to the special nature of the welding object, preparatory work must be done before welding. It is necessary to compile a welding operation instruction manual, which mainly includes the technology of welders and the evaluation of welding processes. During the compilation of this instruction manual, construction technicians should formulate a series of measures for construction technology based on the specific content of the construction and draw up a specific welding plan. Before the start of the welding project, it is necessary to carry out the evaluation work of the welding process, and the main basis for the evaluation is the welding performance of the steel.

[0005] (2) Welding process The welding process mainly includes working links such as backing, filling, surfacing, and weld seams. The welding processes required for different links are also different.

[0006] ① Backing welding. Argon arc welding is generally selected for backing welding, which is carried out from bottom to top. At the starting and ending points of welding, the interfaces that can be joined are polished by grinding. The welds of the formation are required to be uniform and not welded through; before using argon arc welding for backing, it is necessary to carry out trial welding first; during the welding process, the trench where the welding operation is located should be enclosed with boards to prevent the influence of wind and sand on the welding quality.

[0007] ② Surfacing welding. During the surfacing welding process, the diameter of the electrode should be selected according to the size of the gap at the welding interface. During the welding process, the starting and ending points of the electrode arc must be staggered from the middle layer weld to prevent arcing on the surface of the middle layer weld.

[0008] ③ Middle - layer welding. The weld joints of this layer and the bottom - layer joints should be staggered by at least 10 mm to be suitable for the diameter of the welding electrode. If the wall thickness of the petrochemical pipeline to be welded is 9 mm, a three - layer weld can be selected. The best way to move the electrode in the middle layer is in a straight line. After this layer of welding is completed, it is necessary to remove the spatter and slag generated during welding. When quality problems are found during quality inspection, they must be solved immediately.

[0009] ④ Weld seam welding. Arrange a special person to record details such as the pipeline specifications, operators, current, voltage, and ambient temperature. Then number this weld seam and stamp it with a steel seal for future inspection work.

[0010] During the process of pipeline welding, it is easy to have quality problems and it is difficult to achieve the expected effect of quality control. The main problems include:

[0011] Porosity is a common problem in the welding process. The reason for its occurrence is that the gas in the molten pool has not completely overflowed before the molten metal solidifies. There are many types of pores, mainly columnar pores and round pores. Columnar pores have a greater depth, while round pores have a larger area. These pores will affect the welding quality and increase the probability of cracks in the weld seam.

[0012] Slag inclusion is one of the more serious quality problems in welding quality. Slag inclusion means that there are a large number of impurities such as rust and slag in the weld seam, which affects the welding quality. Slag inclusion often appears in the inter - layer and root of the weld bead.

[0013] Cracks occur during the welding process. The internal stress of the weld bead is affected, causing the cracks to continuously extend and expand, and finally leading to fatal damage to the entire pipeline. Cracks are common problems that damage the welding process quality of petrochemical pipelines and pose potential safety hazards to the safe use of pipelines. The common cracks are mainly crystallization, liquefaction, and delay. Crystallization cracks are the most likely to appear in pipelines. They occur during the process of welding completion and gradual solidification. Liquefaction cracks have the same generation process as crystallization cracks, but cracking cracks appear several hours or days after welding completion. Delayed cracks are due to the extensibility of the cracks themselves. Affected by the hydrogen content in the weld of the welded base material and the stress on the welded joint, and during long - term changes, the cracks will gradually become larger, endangering the use quality and safety of the pipeline.

[0014] From the common quality problems in the above - mentioned welding process, it can be seen that the quality of welders themselves, welding materials, and welding methods are all important factors affecting welding quality. Therefore, it is extremely urgent to design a rotary welding fixture for petrochemical pipelines. Utility Model Content

[0015] In order to overcome the deficiencies of the prior art, the purpose of the present utility model is to provide a rotating welding fixture for petrochemical pipelines. The pneumatic link clamping mechanism is used to fixedly clamp the butting joint of the petrochemical pipeline. Taking this as the supporting force, the motor is used to drive the central gear, and the re-gear drives the large gear and the small gear to mesh and rotate, thereby driving the gear track to rotate in the circumferential direction.

[0016] The technical solution adopted by the present utility model:

[0017] A rotating welding fixture for petrochemical pipelines, which includes a left baffle and a right baffle. A pneumatic link clamping mechanism and a rotating mechanism are respectively arranged on the symmetrical planes of the left baffle and the right baffle. When the pneumatic link clamping mechanism clamps the pipeline, the circumferential rotation of the pipeline is realized through the rotating mechanism.

[0018] In the above technical solution, a mounting seat is arranged on the left baffle / right baffle.

[0019] In the above technical solution, further, the rotating mechanism includes a central gear. The central gear is arranged on a positioning shaft, and the central gear is connected to the mounting seat through a bearing. A large gear is meshed on each side of the central gear. Two small gears are respectively meshed with the two large gears. Both small gears are meshed with the gear track, and both large gears and both small gears are connected to the mounting seat through bearings. The gear track is connected to the left baffle / right baffle through screws.

[0020] In the above technical solution, furthermore, the mounting seat is welded to the left baffle / right baffle, and the mounting seat is of an inverted "Y" - shaped structure. A "Z" - shaped plate is integrally formed at the top of the inverted "Y" - shaped structure. The positioning shaft passes through the "Z" - shaped plate and is connected to the central gear, and the positioning shaft is connected to the "Z" - shaped plate through a bearing.

[0021] In the above technical solution, furthermore, the rotating mechanism includes a fixed seat. The fixed seat is fixed below the bottom horizontal plane of the "Z" - shaped plate through screws. A screw rod is arranged above the bottom horizontal plane of the "Z" - shaped plate. The screw rod passes through the top wall of the fixed seat and is threadedly connected to a horizontal connecting block. The two ends of the horizontal connecting block are respectively hinged to the top of a connecting rod A. The bottoms of the two connecting rods A are hinged to two symmetrically arranged movable rods. The rod body of the movable rod is hinged to the side wing of the fixed seat. The bottom of the movable rod is hinged to an arc - shaped clamping jaw. The top of the arc - shaped clamping jaw is hinged to the bottom wall of the fixed seat through a connecting rod B.

[0022] Compared with the prior art, the beneficial effects of the present utility model are:

[0023] 1. The utility model fixes and clamps the docking joint of a petrochemical pipeline through a pneumatic link clamping mechanism. Taking this as the supporting force, the motor is used to drive the central gear to rotate. Driven by the central gear, the large gear and the small gear mesh and drive the gear track to rotate in the circumferential direction, realizing the welding operation at the docking joint of the welding machine, and reducing the influence of manual operation on the welding quality (the whole structure drives the pipeline to rotate, and there is no need to rotate the welding machine). Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0025] Figure 1 Schematic diagram of a rotary welding fixture for petrochemical pipelines

[0026] Figure 2 Schematic diagram of the rotating mechanism

[0027] Figure 3 is Figure 2 rear view

[0028] Figure 4 Schematic diagram of the mounting seat

[0029] Figure 5 Front view of the pneumatic link clamping mechanism

[0030] Figure 6 Schematic diagram of the pneumatic link clamping mechanism at 45° above the left

[0031] Figure 7 Schematic diagram of the pneumatic link clamping mechanism at 45° below the left

[0032] Among them, 1. Right baffle, 2. Left baffle, 3. Rotating mechanism, 301. Central gear, 302. Large gear, 303. Small gear, 304. Gear track; 305. Positioning shaft, 4. Pneumatic link clamping mechanism, 401. Fixed seat, 402. Screw, 403. Horizontal connecting block, 404. Link A, 405. Live rod, 406. Arc-shaped clamping jaw, 407. Link B, 5. Mounting seat, 6. Pipeline. Detailed Embodiment

[0033] To make the objects, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0035] Embodiment 1

[0036] Referring to Figure 1-3 As shown, this embodiment provides a rotary welding fixture for a petrochemical pipeline 6, which includes a left baffle 2 and a right baffle 1. An air-operated link clamping mechanism 4 and a rotating mechanism 3 are respectively arranged on the symmetry planes of the left baffle 2 and the right baffle 1. When the air-operated link clamping mechanism 4 clamps the pipeline 6, the rotating mechanism 3 drives the pipeline 6 to rotate circumferentially.

[0037] The rotating mechanism 3 includes a central gear 301. The central gear 301 is arranged on a positioning shaft 305. An installation seat 5 is arranged on the left baffle 2 / right baffle 1. The installation seat 5 is fixed to the left baffle 2 and the right baffle 1 by screws. The central gear 301 is connected to the installation seat 5 through a bearing. A large gear 302 is meshed on each side of the central gear 301. Each of the two large gears 302 meshes with a small gear 303. Both of the two small gears 303 are meshed with a gear track 304. Moreover, the two large gears 302 and the two small gears 303 are both connected to the installation seat 5 through bearings. The gear track 304 is connected to the left baffle 2 / right baffle 1 by screws.

[0038] As Figure 4 shown, the installation seat 5 is welded to the left baffle 2 / right baffle 1. And the installation seat 5 is of an inverted "Y" - shaped structure, and a "Z" - shaped plate is integrally formed at the top of the inverted "Y" - shaped structure. The positioning shaft 305 penetrates through the "Z" - shaped plate and is connected to the central gear 301. And the positioning shaft 305 is connected to the "Z" - shaped plate through a bearing.

[0039] Align the two pipe ends to be welded, leaving an appropriate margin. After using the pneumatic link clamping mechanisms 4 on the left baffle 2 and the right baffle 1 to clamp the two pipes 6 respectively and press them tightly, the motor is key-connected to the positioning shaft 305. The motor drives the central gear 301 to rotate. Driven by the central gear 301, the large gear 302 and the small gear 303 mesh and drive, driving the gear track 304 to rotate in its circumferential direction, and finally driving the pipe to rotate self - sufficiently, realizing the welding operation of the welding machine on the docking joint of the petrochemical pipe 6.

[0040] Embodiment 2

[0041] Based on Embodiment 1, this embodiment describes the rotating mechanism 3 in detail.

[0042] As Figure 5-7 shown, the rotating mechanism 3 includes a fixed seat 401. The fixed seat 401 is fixed to the bottom horizontal plane of the "Z" - shaped plate by screws. Above the bottom horizontal plane of the "Z" - shaped plate, there is a screw rod 402. The screw rod 402 passes through the top wall of the fixed seat 401 and is thread - connected to the horizontal connecting block 403. The two ends of the horizontal connecting block 403 are respectively hinged to the top of a connecting rod A 404. The bottoms of the two connecting rods A 404 are hinged to two symmetrically arranged movable rods 405. The rod body of the movable rod 405 is hinged to the flank of the fixed seat 401. The bottom of the movable rod 405 is hinged to an arc - shaped clamping jaw 406. The top of the arc - shaped clamping jaw 406 is hinged to the bottom wall of the fixed seat 401 through a connecting rod B 407.

[0043] When the pneumatic drive rotates the screw rod 402, the horizontal connecting block 403 moves up and down on the screw rod 402. When the horizontal connecting block 403 moves upward on the screw rod 402, the two opposite movable rods 405 are driven by the connecting rod A 404 to rotate away from each other. Then the arc - shaped clamping jaws 406 hinged to the bottoms of the two connecting rods rotate relatively and close to clamp the pipe 6 tightly.

[0044] The above - mentioned rotation of the screw rod 402 by pneumatic drive belongs to the prior art and will not be elaborated here one by one.

[0045] Welding processes corresponding to Embodiment 1 and Embodiment 2:

[0046] The pneumatic drive rotates the screw rod 402. The horizontal connecting block 403 moves upward on the screw rod 402. The connecting rod A 404 drives the two opposite movable rods 405 to rotate away from each other. Then the arc - shaped clamping jaws 406 hinged to the bottoms of the two connecting rods rotate relatively and close to clamp the pipe 6 tightly, realizing the fixed clamping of the docking joint of the petrochemical pipe. Taking this as the supporting force, the motor drives the central gear 301. Driven by the central gear 301, the large gear 302 and the small gear 303 mesh and drive, driving the gear track 304 to rotate in its circumferential direction, and then driving the pipe to rotate self - sufficiently, realizing the welding of one - week of the pipe docking position without the rotation of the welding machine.

[0047] The above are only the preferred embodiments of the present utility model and do not impose any limitations on the present utility model. Any simple modifications, changes, and equivalent variations made to the above embodiments based on the technical essence of the utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A rotary welding fixture for petrochemical pipelines, characterized in that The fixture includes a left baffle and a right baffle. An air-operated link clamping mechanism and a rotating mechanism are respectively arranged on the symmetry planes of the left baffle and the right baffle. When the air-operated link clamping mechanism clamps the pipeline, the circumferential rotation of the pipeline is realized through the rotating mechanism.

2. The rotary welding fixture for petrochemical pipelines according to claim 1, wherein, Mounting seats are arranged on the left baffle / right baffle.

3. The rotary welding fixture for petrochemical pipelines according to claim 2, characterized in that, The rotating mechanism includes a central gear. The central gear is arranged on a positioning shaft, and the central gear is connected to the mounting seat through a bearing. A large gear is meshed on each side of the central gear. Each of the two large gears meshes with a small gear. Both of the two small gears are meshed with a gear track, and the two large gears and the two small gears are all connected to the mounting seat through bearings. The gear track is connected to the left baffle / right baffle by screws.

4. The rotary welding fixture for petrochemical pipelines according to claim 2, characterized in that, The mounting seat is welded to the left baffle / right baffle, and the mounting seat is of an inverted "Y" - shaped structure. A "Z" - shaped plate is integrally formed at the top of the inverted "Y" - shaped structure. The positioning shaft penetrates through the "Z" - shaped plate and is connected to the central gear, and the positioning shaft is connected to the "Z" - shaped plate through a bearing.

5. The rotary welding fixture for petrochemical pipelines according to claim 4, characterized in that The rotating mechanism includes a fixed seat. The fixed seat is arranged below the "Z" - shaped plate. A screw rod is arranged above the horizontal plane at the bottom of the "Z" - shaped plate. The screw rod penetrates through the top wall of the fixed seat and is threadedly connected to a horizontal connecting block. The two ends of the horizontal connecting block are respectively hinged to the top of a link A. The bottoms of the two link As are hinged to two symmetrically arranged live rods. The rod body of the live rod is hinged to the side wing of the fixed seat. The bottom of the live rod is hinged to an arc-shaped claw. The top of the arc-shaped claw is hinged to the bottom wall of the fixed seat through a link B.

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