Oil pillow inclined pipeline field welding tooling

Abstract

This utility model relates to the field of welding fixtures and equipment, specifically to on-site welding fixtures for inclined oil conservator pipelines. It includes a support assembly, a height-adjustable movable support plate assembly, and a positioning structure for fixing the gas relay side flange. The support assembly comprises a first support and a second support. The first support is formed by welding a first base, a semi-circular hole support plate, and angle steel, with a slotted hole on the angle steel. The second support is formed by welding a second base and a nut, with a steel sleeve with an inner hole installed inside the nut. Relying on the matching structure between the T-shaped thread of the screw and the inner threaded sleeve of the movable support plate, and with the convenient operation of the handle, the movable support plate can be driven to smoothly rise and fall along the screw. Simultaneously, the precise clearance fit between the steel sleeve of the second support and the smooth rod of the screw ensures excellent height adjustment accuracy. The semi-circular hole support, with specifications identical to the movable support plate, can accurately replicate the original pipeline's inclination angle, completely solving the problem of large angle errors in traditional manual surveying.

Description

Technical Field

[0001] This utility model relates to the field of welding tooling and equipment technology, specifically to on-site welding tooling for inclined oil conservator pipelines. Background Technology

[0002] In the power system operation and maintenance system, transformers, as the core equipment for power transmission and distribution, directly determine the reliability of the power grid's supply through their operational stability. With the continuous growth of social electricity load, a large number of operating transformers face the need for upgrades to improve their load-bearing capacity. As a key component for transformer oil storage, compensation, and oil-gas separation, the oil conservator's upgrade (such as increased volume and optimized sealing performance) has become a core aspect of these upgrades. However, the fabrication of the inclined pipeline between the gas relay and the oil conservator during oil conservator replacement has long faced multiple technical bottlenecks, the specific pain points of which are as follows: I. Limited pre-survey conditions and prominent problem of hole position deviation. Before the transformer is upgraded, it must maintain continuous power supply. Power cannot be cut off in advance to disassemble the crude oil conservator and pipelines, making it impossible to pre-measure the relative positions of the oil inlet and the gas relay flange. When the new conservator is installed on the original transformer support, factors such as manufacturing tolerances of the new conservator and aging and deformation of the original support often cause vertical offsets (within ±50mm) and lateral offsets (within ±30mm) at the oil inlet. These offsets directly lead to inaccurate matching between the new pipelines and the oil inlets and gas relay flange holes. Forced installation can easily cause sealing failure, resulting in transformer oil leakage, or accelerated component aging due to stress concentration in the pipelines. II. Under short-term power outage conditions, traditional manufacturing methods suffer from both low efficiency and low precision. Transformer outage modification time is strictly limited (the industry standard requirement is ≤4 hours), and the oil tank installation location is mostly in a high-altitude area of ​​3-5m above the ground, which presents significant shortcomings in the traditional pipeline fabrication process: The surveying efficiency is low: workers need to climb to high altitudes multiple times and manually measure the tilt angle of the original pipeline and the distance between flange holes with tools such as tape measures and levels. A single survey can take 1.5 to 2 hours, and the measurement data is prone to deviation due to the limited space for high-altitude operation. Insufficient manufacturing precision: Relying on manual experience to adjust the bend angle and straight pipe length often results in pipe tilt angle errors exceeding 1° and offset control errors reaching 3-5mm. This precision defect disrupts the core oil-gas separation logic of "gas entering the gas relay upwards and transformer oil flowing back downwards." At best, it causes the gas relay to malfunction (leading to unplanned power outages); at worst, it causes gas accumulation inside the transformer, preventing timely fault warnings and even leading to major accidents such as insulation system deterioration and equipment burnout.

[0003] Third, high-altitude operations are high-risk, and the safety of operation and maintenance cannot be guaranteed. In traditional processes, workers need to carry measuring tools, pipes, welding equipment, etc., and frequently operate on high-altitude platforms, repeatedly going up and down the transformer to verify dimensions. On the one hand, the space on the high-altitude work platform is narrow, which easily leads to safety accidents such as tools falling and personnel bumping into each other; on the other hand, there is a high-voltage electric field around the transformer, and prolonged high-altitude work increases the risk of electric shock, which does not comply with the power industry's "safety first" operation and maintenance principle. Utility Model Content

[0004] The purpose of this utility model is to provide on-site welding fixtures for inclined pipelines of oil conservator, so as to solve the problem of multiple technical bottlenecks that have long been faced in the fabrication of inclined pipelines between the gas relay and the oil conservator during the replacement of the oil conservator as mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides a field welding fixture for an inclined oil conservator pipeline, including a support assembly, a height-adjustable movable support plate assembly, and a positioning structure for fixing the gas relay side flange. The support assembly includes a first support and a second support. The first support is formed by welding a first base, a semi-circular hole support plate, and an angle steel, with a strip-shaped hole on the angle steel. The second support is formed by welding a second base and a nut, with a steel sleeve with an inner hole installed inside the nut. The height-adjustable movable support plate assembly includes a screw, a handle, and a movable support plate. The lower part of the screw is a smooth rod structure, and the smooth rod part is inserted into the steel sleeve of the second support. The handle is welded to the top of the screw. The movable support plate is welded from an internal threaded sleeve and a semi-circular hole plate. A first locking bolt is installed on the internal threaded sleeve, and the movable support plate is threadedly connected to the screw through the internal threaded sleeve. The positioning structure for fixing the gas relay side flange includes a first connecting bolt and a second connecting bolt. The gas relay side flange is fixed to the semi-circular hole support plate of the first support by at least two sets of the first connecting bolts and the second connecting bolts. The angle steel is detachably connected to the semi-circular hole support plate by the second connecting bolt and can move up and down along the strip hole to adapt to different flange specifications.

[0006] This setup features a first support formed by welding a first base, a semi-circular hole support plate, and angle steel to create a stable frame. The slotted hole in the angle steel provides adjustment space for flange positioning. The second support is formed by welding a second base and a nut, with an internal steel sleeve providing vertical support and a guiding foundation for the screw. This dual-support structure ensures the overall stability of the fixture. The lower smooth rod of the screw is inserted into the steel sleeve of the second support, achieving vertical positioning of the screw through the cooperation of the smooth rod and the steel sleeve. The movable support plate is threaded to the screw via an internal threaded sleeve. Rotating the handle drives the movable support plate to rise and fall along the screw. The first locking bolt is used to lock the adjusted height position, forming a "support-adjustment-locking" height control logic. At least two sets of connecting bolts (the first and second connecting bolts) are used to fix the gas relay side flange to the semi-circular hole support plate of the first support, ensuring stable flange positioning. The angle steel is detachably connected to the semi-circular hole support plate via the second connecting bolt and can move up and down along the slotted hole. By adjusting the position of the angle steel to adapt to the mounting hole positions of different flange sizes, universal adjustment of flange positioning is achieved.

[0007] Preferably, the external thread of the screw is a T-type thread, and the internal thread sleeve of the movable support plate is adapted to the T-type thread.

[0008] The screw's external thread uses a T-type thread with a trapezoidal tooth profile, which features strong load-bearing capacity, high transmission efficiency, and wear resistance. The movable support plate's internal thread sleeve is precisely matched with the T-type thread, and force is transmitted through thread engagement. When the handle is rotated, the engagement between the threads drives the movable support plate to rise and fall smoothly along the screw, avoiding the problems of easy stripping and weak load-bearing capacity of ordinary triangular threads.

[0009] Preferably, the semi-circular hole support plate of the first support has the same specifications as the semi-circular hole plate of the movable support plate, and the opening direction of the semi-circular holes of the two are the same, which are used to jointly support the original pipeline or the newly manufactured pipeline. Both the original pipeline and the newly manufactured pipeline are equipped with elbows and straight pipe sections at their ends.

[0010] The specifications (diameter and depth) of the semi-circular hole support plate of the first support and the semi-circular hole plate of the movable support plate are completely consistent, and the opening direction is the same. The two form a symmetrical arc support structure. This structure can ensure that when the original pipeline or the newly made pipeline is placed on the support, the pipe wall is tightly fitted with the semi-circular hole, and the pipeline axis remains horizontal or at a preset tilt angle, avoiding the pipeline from being skewed due to the difference in support specifications.

[0011] Preferably, the steel sleeve of the second support is connected to the nut by a thread, and the inner diameter of the steel sleeve is in clearance fit with the smooth diameter of the screw rod, with a clearance value of 0.1-0.3mm.

[0012] This feature allows the steel sleeve to be removable and replaceable via a threaded connection to the nut of the second support, facilitating subsequent maintenance. The gap between the inner diameter of the steel sleeve and the diameter of the screw rod is controlled at 0.1-0.3mm, ensuring that the screw rod can rotate and move freely within the steel sleeve while preventing excessive gap from causing the screw to wobble, thus forming a dual function of "removable-guided-limited".

[0013] Preferably, a second locking bolt is installed on the semi-circular hole plate of the movable support plate. The second locking bolt is arranged radially along the semi-circular hole and is used to tighten and fix the pipeline placed in the semi-circular hole.

[0014] The second locking bolt is installed radially along the semicircular hole, with its axis passing through the center of the semicircular hole. After the pipeline is placed in the semicircular hole, tighten the second locking bolt. The end of the bolt can press against the outer wall of the pipeline, and the pipeline is fixed in the semicircular hole by radial pressure, so as to prevent the pipeline from shifting due to vibration or external force during the surveying or welding process.

[0015] Preferably, both the first base and the second base are rectangular steel plate structures with anti-slip textures on the bottom. The thickness of the rectangular steel plate is 8-12mm and the side length is 150-200mm.

[0016] This rectangular steel plate base has a large contact area (side length 150-200mm) and a thickness of 8-12mm, ensuring that the base has a strong load-bearing capacity and is not easily deformed; the anti-slip texture on the bottom increases the friction between the base and the ground, preventing the tooling from sliding due to external forces (such as personnel touching or welding vibration) during placement or operation.

[0017] Preferably, the length of the strip hole in the angle steel is 50-80mm and the width is 12-16mm, which is used to adapt to the mounting hole positions of the gas relay side flange of different sizes.

[0018] The length of the slotted hole is 50-80mm to provide sufficient adjustment stroke for the angle steel to move up and down, and the width is 12-16mm to accommodate the diameter of common connecting bolts, ensuring that the bolts can slide smoothly in the hole. When adapting to different specifications of flanges, the flange installation height can be changed by adjusting the position of the angle steel in the slotted hole, so that the flange mounting hole and the connecting bolt are precisely aligned.

[0019] Preferably, the handle is a disc structure with a diameter of 25-30mm.

[0020] This design features a disc-shaped handle with a large grip area and a diameter of 25-30mm, which is ergonomically designed to facilitate one-handed gripping and force application. When rotating the handle, the disc shape ensures even force distribution to the hand, avoiding the slipperiness and discomfort associated with traditional cylindrical handles.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: I. In the on-site welding fixture for the inclined oil conservator pipeline, precise control of key pipeline parameters is crucial for solidifying the foundation of oil-gas separation and equipment safety. Utilizing the matching structure between the T-shaped thread of the screw and the internal threaded sleeve of the movable support plate, along with the convenient operation of the handle, the movable support plate can be driven to smoothly rise and fall along the screw. Simultaneously, the precise clearance fit between the second support steel sleeve and the screw's smooth rod ensures excellent height adjustment accuracy. Furthermore, the semi-circular hole support (with the same opening direction) of the first support and the movable support plate, matching in specifications, accurately replicates the tilt angle of the original pipeline, completely solving the problem of large angle errors in traditional manual surveying. This precision ensures the core oil-gas separation logic of "gas entering the gas relay upwards and transformer oil flowing back downwards," fundamentally avoiding major risks such as gas protection failure, insulation system deterioration, and equipment burnout. The slotted holes on the angle steel allow for flexible adjustment of the upper and lower installation positions of the gas relay side flange, easily accommodating the differences in hole positions of flanges of different specifications. Combined with the height adjustment function of the movable support plate, it can accurately compensate for the height and lateral offset of the oil port under the new oil tank, ensuring precise control of the offset of the newly manufactured pipeline and flange hole positions, and effectively preventing problems such as transformer oil leakage and accelerated aging of pipeline due to hole misalignment. II. The on-site welding fixture for this inclined oil conservator pipeline significantly improves construction efficiency and is perfectly suited for short-term power outages. No personnel need to climb to heights to work. The original pipeline that has been removed can simply be placed on the semi-circular hole support of the tooling. By adjusting the height of the movable support plate and the position of the angle steel, the tilt angle and flange positioning can be accurately measured. The time required for a single measurement is greatly reduced, and the efficiency is significantly improved compared to traditional manual high-altitude measurement, saving a lot of time for the subsequent fabrication of new pipelines. Using the existing pipeline positioned by the tooling as a reference, the gas relay side flange of the newly fabricated pipeline is directly fixed on the tooling. Combined with the total length of the existing pipeline measured with a tape measure and the precisely adjusted tilt angle, the straight pipe section length can be cut and the elbow angle adjusted simultaneously. The entire process of tooling installation, surveying, and new pipeline fabrication is time-efficient, fully adaptable to short-term transformer power outages, and significantly reduces the total construction time compared to traditional fabrication methods, minimizing losses from unplanned power outages. Third, the on-site welding fixture for the inclined oil conservator pipeline enhances versatility and practicality, covering maintenance needs across multiple scenarios. The semi-circular hole support of the tooling is compatible with common pipeline specifications. Combined with the adjustment range of the angle steel strip hole and the height adaptability of the movable support plate, it can meet the oil tank replacement needs of transformers of different voltage levels without frequent replacement of tooling parts. This solves the problem of insufficient versatility of existing tooling with "one tool for one device" and reduces operation and maintenance costs. The steel sleeve and nut of the second support are connected by threads. The screw and movable support plate can be disassembled into independent components. The overall weight is light and the size is small, making it easy to carry to the transformer site (especially high-altitude platforms or narrow spaces). The first base and the second base are made of thick rectangular steel plates. The anti-slip texture on the bottom can ensure that the tooling is placed stably on the ground or temporary platform, avoiding the tooling from shifting during construction and affecting accuracy, thus improving the convenience of on-site operation. Fourth, the on-site welding fixtures for the inclined oil conservator pipeline significantly reduce safety risks and comply with power safety operation and maintenance guidelines. The entire process eliminates the need for personnel to climb at heights, carry measuring tools, or operate welding equipment at heights, completely avoiding safety risks such as falls from heights, falling tools, and electric shocks from high-voltage electric fields, reducing the incidence of accidents during high-altitude operations, and conforming to the power industry's "safety first" operation and maintenance principle. The movable support plate is locked in height by the first locking bolt, and the second locking bolt radially presses against the pipeline along the semi-circular hole to ensure the relative position of the pipeline and the tooling is stable during the surveying and welding process, avoiding measurement errors or welding deviations caused by pipeline shaking; at the same time, the disc structure handle is easy for the operator to apply force to adjust and is not easy to slip, further improving the safety of operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a top view of the structure of this utility model; The meanings of the labels in the diagram are as follows: 1. First support; 2. Second support; 3. Movable support plate; 4. Screw; 5. Handle; 7. First locking bolt; 8. Original pipeline; 9. Newly manufactured pipeline; 10. Elbow; 11. Straight pipe section; 12. First connecting bolt; 13. Second connecting bolt; 14. Angle steel; 15. Semi-circular hole support plate; 16. Second locking bolt; 17. Second base; 18. First base. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides on-site welding fixtures for inclined oil conservator pipelines, such as... Figures 1-3As shown, the device includes a support assembly, a height-adjustable movable support plate assembly, and a positioning structure for fixing the gas relay side flange. The support assembly includes a first support 1 and a second support 2. The first support 1 is formed by welding a first base 18, a semi-circular hole support plate 15, and an angle steel 14. The angle steel 14 has a strip-shaped hole. The second support 2 is formed by welding a second base 17 and a nut, and a steel sleeve with an inner hole is installed inside the nut. The height-adjustable movable support plate assembly includes a screw 4, a handle 5, and a movable support plate 3. The lower part of the screw 4 is a smooth rod structure, and the smooth rod part is inserted into the steel sleeve of the second support 2. The handle 5 is welded to the top of the screw 4. The movable support plate 3 is welded from an internal threaded sleeve and a semi-circular hole plate. The internal threaded sleeve is equipped with a first locking bolt 7, and the movable support plate 3 is threadedly connected to the screw 4 through the internal threaded sleeve. The positioning structure for fixing the gas relay side flange includes a first connecting bolt 12 and a second connecting bolt 13. The gas relay side flange is fixed to the semi-circular hole support plate 15 of the first support 1 by at least two sets of first connecting bolts 12 and second connecting bolts 13. The angle steel 14 is detachably connected to the semi-circular hole support plate 15 by the second connecting bolt 13 and can move up and down along the strip hole to adapt to different flange specifications.

[0025] The support components provide a stable foundation for pipeline support and flange positioning, preventing tooling displacement from affecting surveying and welding accuracy; the height-adjustable components enable flexible raising and lowering of the movable support plate 3, providing core adjustment functions for accurately replicating the tilt angle of the original pipeline 8, solving the problem of traditional manual height control being inaccurate; the flange positioning structure, through multi-bolt fixing and strip hole adjustment, ensures the flange positioning is firm and can adapt to different flange specifications without replacing positioning components, improving tooling versatility.

[0026] In this embodiment, the external thread of the screw 4 is a T-type thread, and the internal thread sleeve of the movable support plate 3 is adapted to the T-type thread.

[0027] The high load-bearing capacity of the T-type thread ensures that the movable support plate 3 can stably support the weight of the pipeline and avoid height deviation caused by thread deformation; the smooth thread engagement makes the movable support plate 3 rise and fall smoothly, improves the height adjustment accuracy, and the wear-resistant properties extend the service life of the screw 4 and the inner thread sleeve of the movable support plate 3, reducing the frequency of tooling maintenance.

[0028] Specifically, the semi-circular hole support plate 15 of the first support 1 has the same specifications as the semi-circular hole plate of the movable support plate 3, and the opening direction of the semi-circular holes of the two are the same. They are used to jointly support the original pipeline 8 or the newly made pipeline 9. Both the original pipeline 8 and the newly made pipeline 9 are equipped with elbows 10 and straight pipe sections 11 at their ends.

[0029] Symmetrical and uniformly sized semi-circular hole supports ensure stable placement of pipelines and eliminate surveying errors caused by unstable supports. When supporting the original pipeline 8, they can accurately restore the actual tilt state of the pipeline, providing a precise benchmark for the fabrication of the new pipeline 9. When supporting the new pipeline 9, they ensure that the pipeline position is fixed during welding, improving the fabrication accuracy of the new pipeline.

[0030] Furthermore, the steel sleeve of the second support 2 is connected to the nut by threads, and the inner diameter of the steel sleeve is clearance-fitted with the smooth diameter of the screw 4, with a clearance value of 0.1-0.3mm.

[0031] The detachable steel sleeve design allows for individual replacement when the steel sleeve is worn, reducing the maintenance cost of the second support 2; the small clearance fit ensures that the screw 4 does not wobble significantly when it is raised or lowered, improving the height adjustment accuracy, ensuring accurate measurement of the tilt angle of the original pipeline 8, and reducing frictional wear between the screw 4 and the steel sleeve.

[0032] Furthermore, a second locking bolt 16 is installed on the semi-circular hole plate of the movable support plate 3. The second locking bolt 16 is arranged radially along the semi-circular hole and is used to tighten and fix the pipeline placed in the semi-circular hole.

[0033] The radial clamping fixing method can firmly lock the original pipeline 8 and the newly made pipeline 9 in position, eliminating measurement or welding errors caused by pipeline displacement; the clamping force of the second locking bolt 16 can be flexibly adjusted, which can not only fix the pipeline, but also avoid excessive compression and damage to the outer wall of the pipeline, and is suitable for pipelines with different wall thicknesses.

[0034] Furthermore, both the first base 18 and the second base 17 are rectangular steel plate structures with anti-slip textures on the bottom. The thickness of the rectangular steel plate is 8-12mm and the side length is 150-200mm.

[0035] The thick rectangular steel plate base enhances the overall stability of the tooling and prevents the first support 1 and the second support 2 from tilting due to base deformation, thus ensuring the accuracy of surveying and welding. The anti-slip texture effectively prevents the tooling from sliding, especially on uneven ground or temporary platforms at the transformer site, it can still keep the first support 1 and the second support 2 stable, thus improving operational safety.

[0036] Furthermore, the length of the strip hole in angle steel 14 is 50-80mm and the width is 12-16mm, which is used to adapt to the mounting hole positions of gas relay side flanges of different sizes.

[0037] Sufficient adjustment stroke covers the hole height differences of most gas relay side flanges, eliminating the need to replace angle steel 14 and improving tooling versatility; the strip hole width is compatible with standard bolts, ensuring smooth bolt sliding and facilitating quick adjustment of the angle steel 14 position, shortening flange positioning time and improving construction efficiency.

[0038] Furthermore, the handle 5 has a disc structure with a diameter of 25-30mm.

[0039] The ergonomically designed handle 5 reduces operator hand fatigue, especially when repeatedly adjusting the height of the movable support plate 3, thus improving operating comfort; the grip is firm and not easy to slip, ensuring that the force when rotating the handle 5 is controllable, making the lifting speed of the movable support plate 3 smooth and further improving the accuracy of height adjustment.

[0040] When using the on-site welding fixture for the inclined oil conservator pipeline of this utility model, first place the first support 1 and the second support 2 on a flat ground next to the transformer, ensuring that the anti-slip texture on the bottom of both is in close contact with the ground to prevent the fixture from sliding; according to the total length of the original pipeline 8 to be removed, adjust the distance between the first support 1 and the second support 2 so that the semi-circular hole support plates of both (the semi-circular hole support plate 15 of the first support 1 and the semi-circular hole plate of the movable support plate 3) can support the two ends of the original pipeline 8 respectively, in preparation for subsequent surveying. The gas relay side flange is attached to the side of the semi-circular hole support plate 15 of the first support 1. According to the flange mounting hole position, the vertical position of the angle steel 14 along the strip hole (the strip hole length is 50-80mm and the width is 12-16mm to adapt to different flange hole positions) is adjusted so that the hole position of the angle steel 14 is aligned with the flange mounting hole. Then, at least two sets of first connecting bolts 12 and second connecting bolts 13 are passed through the flange mounting hole and the strip hole of the angle steel 14 in sequence, and the bolts are tightened to fix the flange and the semi-circular hole support plate 15, forming a stable mapping benchmark. Place one end of the dismantled original pipe 8 on the semi-circular hole support plate 15 of the first support 1 (close to the fixed gas relay side flange), and the other end on the semi-circular hole plate of the movable support plate 3; rotate the handle 5 (disc structure, diameter 25-30mm, easy to grip) clockwise or counterclockwise to drive the screw 4 to rotate. Since the movable support plate 3 is adapted to the T-shaped thread of the screw 4 through the internal thread sleeve, the rotation of the screw 4 will drive the movable support plate 3 to move up and down along the screw 4 until the semi-circular hole plate of the movable support plate 3 is tightly attached to the wall of the original pipe 8. At this time, the original pipe 8 returns to the tilt angle when it was actually installed; then tighten the first locking bolt 7 to lock the height position of the movable support plate 3 on the screw 4, and then tighten the second locking bolt 16 on the semi-circular hole plate of the movable support plate 3 so that the bolt end presses against the outer wall of the original pipe 8, fixing the original pipe 8 in the semi-circular hole support, and completing the tilt angle measurement. Place the removed old oil tank on the ground and measure the relative position dimensions of the old oil tank flange hole and the gas relay side flange (which has been fixed to the tooling); then measure the position parameters of the new oil tank flange hole, and calculate the height difference of the straight pipe section 11 and the offset of the elbow 10 required for the newly made pipeline 9 by comparison, and determine the cutting length of the straight pipe section 11 and the angle adjustment value of the elbow 10. As in step 2, fix the gas relay side flange of the newly fabricated pipeline 9 onto the semi-circular hole support plate 15 of the first support 1 (consistent with the flange positioning reference of the original pipeline 8); according to the tilt angle of the original pipeline 8 measured in step 3 (the height of the movable support plate 3 is already locked), assemble the straight pipe section 11 of the new pipeline 9 (cut to the calculated length) and the elbow 10 (adjusted according to the offset angle), connect one end to the flange, and place the other end on the semi-circular hole plate of the movable support plate 3 to ensure that the tilt angle of the new pipeline 9 is consistent with that of the original pipeline 8; tighten the second locking bolt 16 to tighten the new pipeline 9 to prevent displacement during welding; finally, weld the connection between the straight pipe section 11 and the elbow 10 of the new pipeline 9 according to the welding specifications to complete the fabrication of the new pipeline. After the new pipeline welding is completed and cooled, loosen the first locking bolt 7, the second locking bolt 16, and the first connecting bolt 12 and the second connecting bolt 13 of the fixed flange, and remove the newly made pipeline 9; lower the movable support plate 3 along the screw 4, unscrew the steel sleeve inside the second support 2 (the steel sleeve is threadedly connected to the nut and can be disassembled), disassemble the screw 4, movable support plate 3, handle 5 and other components, and store them separately from the first support 1 and the second support 2 for easy carrying and storage later.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A field welding fixture for inclined oil conservator pipelines, comprising a support assembly, a height-adjustable movable support plate assembly, and a positioning structure for fixing the gas relay side flange, characterized in that: The support assembly includes a first support (1) and a second support (2). The first support (1) is formed by welding a first base (18), a semi-circular hole support plate (15) and an angle steel (14). The angle steel (14) has a strip hole. The second support (2) is formed by welding a second base (17) and a nut. A steel sleeve with an inner hole is installed inside the nut. The height-adjustable movable support plate assembly includes a screw (4), a handle (5), and a movable support plate (3). The lower part of the screw (4) is a bare rod structure, and the bare rod part is inserted into the steel sleeve of the second support (2). The handle (5) is welded to the top of the screw (4). The movable support plate (3) is welded from an internal threaded sleeve and a semi-circular hole plate. A first locking bolt (7) is installed on the internal threaded sleeve, and the movable support plate (3) is threadedly connected to the screw (4) through the internal threaded sleeve. The positioning structure for fixing the gas relay side flange includes a first connecting bolt (12) and a second connecting bolt (13). The gas relay side flange is fixed to the semi-circular hole support plate (15) of the first support (1) by at least two sets of the first connecting bolt (12) and the second connecting bolt (13). The angle steel (14) is detachably connected to the semi-circular hole support plate (15) by the second connecting bolt (13) and can move up and down along the strip hole to adapt to different flange specifications.

2. The on-site welding fixture for the inclined oil conservator pipeline according to claim 1, characterized in that: The external thread of the screw (4) is a T-type thread, and the internal thread sleeve of the movable support plate (3) is adapted to the T-type thread.

3. The on-site welding fixture for the inclined oil conservator pipeline according to claim 1, characterized in that: The semi-circular hole support plate (15) of the first support (1) has the same specifications as the semi-circular hole plate of the movable support plate (3), and the opening direction of the semi-circular holes of the two are the same, which are used to jointly support the original pipeline (8) or the newly made pipeline (9). The ends of the original pipeline (8) and the newly made pipeline (9) are equipped with elbows (10) and straight pipe sections (11).

4. The on-site welding fixture for the inclined oil conservator pipeline according to claim 1, characterized in that: The steel sleeve of the second support (2) is connected to the nut by a thread, and the inner diameter of the steel sleeve is in clearance fit with the smooth diameter of the screw (4), with a clearance value of 0.1-0.3mm.

5. The on-site welding fixture for the inclined oil conservator pipeline according to claim 1, characterized in that: The movable support plate (3) has a second locking bolt (16) installed on its semi-circular hole plate. The second locking bolt (16) is arranged radially along the semi-circular hole and is used to tighten and fix the pipeline placed in the semi-circular hole.

6. The on-site welding fixture for the inclined oil conservator pipeline according to claim 1, characterized in that: The first base (18) and the second base (17) are both rectangular steel plate structures, and the bottom is provided with anti-slip texture. The thickness of the rectangular steel plate is 8-12mm and the side length is 150-200mm.

7. The on-site welding fixture for the inclined oil conservator pipeline according to claim 1, characterized in that: The length of the strip hole of the angle steel (14) is 50-80mm and the width is 12-16mm, which is used to adapt to the mounting hole of the gas relay side flange of different sizes.

8. The on-site welding fixture for the inclined oil conservator pipeline according to claim 1, characterized in that: The handle (5) is a disc structure with a diameter of 25-30mm.

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