A groove grinding device for gas pipeline welding

Abstract

The utility model relates to a kind of grinding devices, more particularly to a kind of bevel grinding device of gas pipeline welding.The grinding device includes support shaft, support shaft is equipped with carousel, gear ring and radial sliding slot are provided on carousel, gear ring is engaged with driving motor on the driving gear;Radial sliding slot is equipped with grindstone by regulator.The grinding device can be directly ground to place by grindstone to pipeline port, can effectively shorten the processing time of bevel and reduce labor intensity.At the same time, it can further improve the consistency of bevel, meet the requirements of welding, and effectively improve the welding quality by improving the quality of bevel.It meets the needs of modern gas pipeline engineering for efficient, high-precision, low-labor-intensity processing.Solves the problem that existing cutting device needs further polishing after gas cutting, which still has high labor intensity.

Description

Technical Field

[0001] This utility model relates to a grinding device, specifically a bevel grinding device for welding gas pipelines. Background Technology

[0002] In gas transmission engineering, the reliability of pipeline connections directly affects the safe and stable operation of the entire gas system. Welding and flange connections are the two most critical connection methods in gas pipeline laying. For medium- and high-pressure gas pipelines with wall thicknesses greater than 6mm, due to the higher pressure and more complex operating conditions, simple flat-end welding cannot guarantee the penetration and mechanical strength of the weld. Therefore, a bevel structure must be pre-processed at the pipeline end. The design and processing quality of the bevel are crucial prerequisites for weld quality—a reasonable bevel angle guides the uniform filling of welding material, ensuring a strong metallurgical bond between the weld and the pipeline body; while precise bevel dimensions and surface quality effectively reduce welding defects and improve the fatigue resistance and corrosion resistance of the connection.

[0003] In traditional processing methods, beveling pipe ends has long relied on manual grinding with handheld angle grinders. This method has several insurmountable drawbacks: Firstly, manual grinding is extremely labor-intensive, requiring operators to maintain a fixed posture for extended periods while grinding the pipe ends in one or more directions, especially in outdoor construction scenarios where space constraints and environmental factors further exacerbate the workload. Secondly, the precision of manual processing depends entirely on the operator's experience and skills, resulting in extremely poor consistency in key indicators such as bevel angle (common V-shaped bevel angles are 30°-45°), blunt edge thickness, and surface roughness. In actual construction, even experienced operators struggle to ensure complete uniformity in processing parameters for adjacent pipe bevels. Problems such as bevel angle deviations exceeding 2°, uneven blunt edge thickness, or deep scratches on the surface can easily lead to defects during welding, including incomplete penetration, slag inclusions, and porosity, and may even cause weld cracking, posing a significant threat to the safe operation of gas pipelines.

[0004] To address the drawbacks of manual grinding, mechanized processing equipment is gradually being applied to the field of pipe beveling. Among them, patent application CN220372411U discloses a pipe beveling gas cutting equipment, which provides a feasible solution for the mechanization upgrade of beveling. The core structure of this equipment includes an inner annular track, an outer arc-shaped track, a fixing plate, a sliding rod, a slider, a limiting mechanism, and a gas cutting gun fixing assembly. The inner annular track can be fixed to the end of the pipe via a clamping structure. The outer arc-shaped track, which is rotatably connected to its outer wall, can achieve circumferential angle adjustment to adapt to the processing needs of pipes with different circumferential sizes. The fixing plate welded to the side surface of the inner annular track integrates a sliding rod. The slider can slide freely along the axial direction of the sliding rod. By adjusting the position of the slider and using the threaded locking structure of the limiting block and the limiting screw, the distance between the gas cutting gun and the pipe end can be precisely controlled, thereby achieving processing of different bevel depths. The cutting machine support plate at the front end of the sliding rod is rotatably connected to the tray via a metal cylinder. The gas cutting gun limiting plate above the tray can fix the angle of the gas cutting gun, ensuring the stability of the gun head posture during the cutting process. Through the coordinated operation of mechanical structures, this device adapts to different diameters and bevel curvature requirements. Operators only need to fix the equipment, adjust the parameters, and start the operation, which greatly reduces the operating threshold. At the same time, the circumferential uniform speed cutting method significantly improves the consistency of the bevel angle, and the cutting accuracy is improved by more than 40% compared with manual grinding, effectively improving the stability of bevel processing.

[0005] Although the aforementioned gas cutting equipment represents a significant leap forward in automation and processing consistency compared to manual grinding, meeting the initial beveling requirements and significantly reducing labor intensity, it still has technical shortcomings due to the inherent characteristics of the gas cutting process. It struggles to meet the high-precision requirements of welding medium- and high-pressure gas pipelines. Gas cutting is a process that melts and blows away metal using a high-temperature flame generated by the combustion of combustible gas and oxygen, achieving material cutting. The cutting temperature reaches over 3000℃, causing oxidation and phase transformation of the metal structure at the pipeline end, forming an oxide scale and heat-affected zone with a thickness of 0.5-2mm. Simultaneously, the splashing and uneven removal of molten slag during gas cutting results in noticeable wavy protrusions and pits on the cut bevel surface, with a surface roughness typically between Ra12.5 and Ra25, far exceeding the welding process requirement of Ra6.3 or less. Therefore, the bevel processed using this gas cutting equipment must undergo secondary grinding. Operators must then use a grinding wheel to meticulously grind away the oxide scale, heat-affected zone, and ripple defects on the bevel surface until it meets the surface quality requirements for welding. This secondary grinding process not only perpetuates the problem of high manual labor intensity but also makes the bevel processing procedure cumbersome and prolongs the processing cycle. Furthermore, the repeated processing may lead to dimensional deviations in the bevel, hindering further improvements in the efficiency of gas pipeline engineering construction.

[0006] Based on the aforementioned technical pain points, the existing beveling process using gas cutting and manual grinding can no longer meet the demands of modern gas pipeline engineering for efficient, high-precision, and low-labor-intensity processing. Therefore, it is urgent to design a beveling grinding device for gas pipeline welding to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a beveling grinding device for gas pipeline welding that can meet welding requirements and further reduce labor intensity.

[0008] The technical solution of this utility model is: A beveling grinding device for gas pipeline welding comprises a support shaft, a turntable, a gear ring, a drive motor, a drive gear, an adjuster, and a grinding stone. Its features include: a turntable movably mounted on the support shaft via bearings; a gear ring is provided on one end face of the turntable; a drive motor is mounted on the support shaft end of one side of the gear ring via a support plate; a drive gear is provided on the output shaft of the drive motor, meshing with the gear ring; and radial grooves are evenly distributed in a ring on the other end face of the turntable, with an adjuster movably mounted on the radial grooves, and a grinding stone mounted on the adjuster.

[0009] An air bladder is provided at the end of the support shaft on one side of the grinding stone; an air pipe is provided on the support shaft between the support plate and the turntable, and the air pipe is connected to the air bladder through an air hole on the support shaft.

[0010] An electric cylinder is mounted on the airbag via a pressure plate. The piston rod end of the electric cylinder passes through the pressure plate, the airbag, and is fixedly connected to the end of the support shaft.

[0011] The adjuster consists of a slide block, a limiting plate, an assembly plate, and an angle adjusting arm. The limiting plate is provided on the slide block, and the assembly plate is fixedly mounted on the slide block outside the limiting plate. An angle adjusting arm is installed on the end of the assembly plate through adjusting bolts, and the end of the angle adjusting arm is fixedly connected to the grinding stone. The slide block is slidably connected to the radial slide groove.

[0012] The slide block is provided with a limit adjustment groove; the limit plate is L-shaped, and the end of the limit plate on one side of the slide block is slidably connected to the limit adjustment groove; multiple universal balls are provided at intervals on the end of the limit plate on the inner side of the angle adjustment arm.

[0013] The limiting plate on one side of the slide has a strip hole, and a set screw is threaded on the slide. The end of the set screw passes through the strip hole, the slide, and the radial groove in sequence to abut against each other.

[0014] The beneficial effects of this utility model are as follows: This beveling and grinding device for gas pipeline welding can directly grind the pipe ends to the correct position using grinding stones, combining the cutting and grinding processes into a single grinding step. This eliminates the need for post-cutting grinding, effectively shortening the beveling processing time and further reducing labor intensity. Simultaneously, because all grinding stones rotate synchronously, the angles, blunt edge thickness, and roughness of the beveling are consistent across all areas, further improving beveling uniformity and meeting welding requirements. Furthermore, improving beveling quality effectively enhances welding quality. This meets the demands of modern gas pipeline engineering for efficient, high-precision, and low-labor-intensity processing. Additionally, the adjustable mechanism combined with radial grooves allows for adaptation to pipes of different diameters and wall thicknesses, effectively improving the device's versatility and expanding its application range. It also solves the problem of existing cutting devices requiring further grinding after gas cutting, which still results in high labor intensity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 yes Figure 1 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the structure of the regulator of this utility model.

[0016] In the diagram: 1. Support shaft, 2. Turntable, 3. Gear ring, 4. Drive motor, 5. Drive gear, 6. Grinding stone, 7. Support plate, 8. Radial groove, 9. Airbag, 10. Air pipe, 11. Air hole, 12. Pressure plate, 13. Electric cylinder, 14. Slide, 15. Limiting plate, 16. Assembly plate, 17. Angle adjusting arm, 18. Adjusting bolt, 19. Limiting adjustment groove, 20. Universal ball, 21. Strip hole, 22. Set screw. Detailed Implementation

[0017] The beveling grinding device for gas pipeline welding consists of a support shaft 1, a turntable 2, a gear ring 3, a drive motor 4, a drive gear 5, an adjuster, and a grinding stone 6. The turntable 2 is movably mounted on the support shaft 1 via bearings. A gear ring 3 is located on one end face of the turntable 2. The drive motor 4 is mounted on the end of the support shaft 1 on one side of the gear ring 3 via a support plate 7. A drive gear 5 is mounted on the output shaft of the drive motor 4, meshing with the gear ring 3. Radial grooves 8 are evenly distributed in a ring on the other end face of the turntable 2. An adjuster is movably mounted on the radial grooves 8, and the grinding stone 6 is mounted on the adjuster. The function of the support shaft 1 is to support the turntable 2 and the drive motor 4 via the pipe insertion point, thereby positioning the adjuster and the grinding stone 6. The function of the drive motor 4 is to drive the drive gear 5 to rotate, which in turn drives the gear ring 3 to rotate, which in turn drives the turntable 2 to rotate. The rotating turntable drives the regulator and the grinding stone 6 to rotate, thereby driving the grinding stone 6 to slide at the pipe end. The grinding stone 6 grinds the pipe end, forming a bevel. Since the bevel is formed directly by grinding, the cutting and grinding steps are combined into one grinding step. After grinding, there is no need to grind the bevel again, which further reduces labor intensity and shortens the beveling time, effectively improving processing efficiency. Since the grinding stone 6 rotates along the pipe end, it ensures that the angle, blunt edge thickness, and roughness of the bevel are consistent after grinding, ensuring the consistency of the bevel and thus effectively improving the bevel quality, thereby effectively improving the welding quality. The function of the regulator is to adjust the position of the grinding stone 6 in conjunction with the radial slide 8, and at the same time adjust the angle of the grinding stone 6 by the regulator itself. By adjusting the position of the grinding stone 6, the grinding stone 6 can be adapted to pipes of different diameters. By adjusting the angle of the grinding stone 6, the grinding angle of the grinding stone 6 can be controlled, thereby controlling the angle of the bevel.

[0018] An air bladder 9 is provided at the end of the support shaft 1 on one side of the grinding stone 6; an air pipe 10 is provided on the support shaft 1 between the support plate 7 and the turntable 2, and the air pipe 10 is connected to the air bladder 9 through the air hole 11 on the support shaft 1. The air pipe 10 is connected to an air pump or air source, so that air is sequentially pumped into the air pipe 10, the air hole 11, and the air bladder 9, thereby causing the air bladder 9 to expand in the pipe. The expanded air bladder 9 supports the support shaft 1, and the expansion of the air bladder 9 allows the support shaft 1 to be supported in pipes of different diameters, solving the problem of the cumbersome process of replacing the support shaft 1 with a diameter that matches the pipe diameter.

[0019] An electric cylinder 13 is mounted on the airbag 9 via a pressure plate 12. The piston rod end of the electric cylinder 13 passes through the pressure plate 12, the airbag 9, and is fixedly connected to the end of the support shaft 1. The function of the electric cylinder 13 is to further compress the inflated airbag 9, using the airbag 9 as a fixed point to pull the support shaft 1 into the pipe. This, in turn, pulls the grinding stone 6 through the turntable 2 and the adjuster, gradually increasing the grinding depth of the pipe end and completing the beveling process. This solves the problem of manually pushing the support shaft 1 and thus the grinding stone 6.

[0020] The regulator consists of a slide block 14, a limiting plate 15, an assembly plate 16, and an angle adjusting arm 17. The limiting plate 15 is mounted on the slide block 14, and the assembly plate 16 is fixedly mounted on the slide block 14 outside the limiting plate 15. An angle adjusting arm 17 is mounted on the end of the assembly plate 16 via adjusting bolts 18, and the end of the angle adjusting arm 17 is fixedly connected to the grinding stone 6. The slide block 14 is slidably connected to the radial groove 8. The function of the limiting plate 15 is to restrict the position of the slide block 14 by the relative sliding between the limiting plate 15 inserted into the pipe and the inner wall of the pipe. This, in turn, restricts the position of the grinding stone 6 sequentially through the slide block 14, the assembly plate 16, and the angle adjusting arm 17. The auxiliary airbag 9 and the support shaft 1 position and support the grinding stone 6, ensuring the relative position of the grinding stone 6 with the pipe end during grinding. The function of the angle adjusting arm 17 is to adjust the grinding angle of the grinding stone 6 by the relative rotation of the angle adjusting arm 17 and the assembly plate 16, thereby adjusting the bevel angle. The slides 14 are linked by a linkage mechanism similar to the jaws of a three-jaw chuck on a machine tool (the linkage mechanism is existing technology and will not be described in detail here). The function of the slides 14 is to adjust the relative position of the grinding stone 6 by sliding the slides 14 relative to the radial groove 8, so that the position of the grinding stone 6 matches the pipe itself. This allows for the grinding and beveling of pipe ends of different diameters, enhancing the versatility of the grinding device.

[0021] The slide block 14 is provided with a limit adjustment groove 19; the limit plate 15 is L-shaped, and the end of the limit plate 15 on one side of the slide block 14 is slidably connected to the limit adjustment groove 19; multiple universal balls 20 are spaced apart on the end of the limit plate 15 on the inner side of the angle adjustment arm 17, so that the rolling of the universal balls 20 with the inner wall of the pipe replaces the direct friction between the limit plate 15 and the inner wall of the pipe, thereby reducing the wear of the limit plate 15. The function of the limit adjustment groove 19 is to adjust the relative position of the limit plate 15 and the grinding stone 6, so that the distance between the grinding stone 6 and the limit plate 15 is adapted to the pipe wall thickness, enabling it to grind pipes with different wall thicknesses, and further enhancing the versatility of the grinding device.

[0022] A strip hole 21 is provided on the limiting plate 15 on one side of the slide block 14. A set screw 22 is threaded on the slide block 14. The end of the set screw 22 passes through the strip hole 21 and the slide block 14 in sequence and abuts against the radial slide groove 8.

[0023] When using the beveling grinding device for gas pipeline welding, the end of the support shaft 1 on one side of the grinding stone 6, the air bladder 9, and the electric cylinder 13 are inserted into the pipeline. After the support shaft 1 is inserted, air is injected into the air bladder 9 through the air pipe 10, causing the air bladder 9 to expand and support the support shaft 1. After the air bladder 9 expands to the set air pressure, the set screws 22 and adjusting bolts 18 are loosened. The position and angle of the grinding stone 6 and the position of the limiting plate 15 are adjusted according to the inner diameter and wall thickness of the pipeline and the beveling angle. After the grinding stone 6 and the limiting plate 15 are adjusted into place, the set screws 22 and adjusting bolts 18 are tightened. After tightening, the drive motor 4 is started. The drive motor 4 drives the grinding stone 6 to rotate sequentially through the drive gear 5, the gear ring 3, the turntable 2, and the adjuster. The rotating grinding stone 6 grinds the pipeline end to form a beveling. During the grinding process of the grinding stone 6, the electric cylinder 13 compresses the air bag 9 to pull the support shaft 1, which in turn pulls the turntable 2, the adjuster and the grinding stone 6 in sequence, increasing the grinding progress of the grinding stone 6 on the pipe end until the blunt edge thickness of the pipe bevel meets the design requirements.

[0024] This beveling and grinding device for gas pipeline welding can directly grind the pipe ends to the correct position using grinding stones, combining the cutting and grinding processes into a single grinding step. This eliminates the need for post-cutting grinding, effectively shortening the beveling processing time and further reducing labor intensity. Simultaneously, because all grinding stones rotate synchronously, the angles, blunt edge thickness, and roughness of the beveling are consistent across all areas, further improving beveling uniformity and meeting welding requirements. Furthermore, improving beveling quality effectively enhances welding quality. This meets the demands of modern gas pipeline engineering for efficient, high-precision, and low-labor-intensity processing. Additionally, the adjustable mechanism combined with radial grooves allows for adaptation to pipes of different diameters and wall thicknesses, effectively improving the device's versatility and expanding its application range. It also solves the problem of existing cutting devices requiring further grinding after gas cutting, which still results in high labor intensity.

Claims

1. A beveling grinding device for gas pipeline welding, comprising a support shaft (1), a turntable (2), a gear ring (3), a drive motor (4), a drive gear (5), an adjuster, and a grinding stone (6), characterized in that: A turntable (2) is movably mounted on the support shaft (1) via a bearing. A gear ring (3) is provided on one end face of the turntable (2). A drive motor (4) is mounted on the end of the support shaft (1) on one side of the gear ring (3) via a support plate (7). A drive gear (5) is provided on the output shaft of the drive motor (4). The drive gear (5) meshes with the gear ring (3). A radial groove (8) is evenly distributed in a ring on the other end face of the turntable (2). An adjuster is movably mounted on the radial groove (8). A grinding stone (6) is provided on the adjuster.

2. The beveling grinding device for gas pipeline welding according to claim 1, characterized in that: An airbag (9) is provided at the end of the support shaft (1) on one side of the grinding stone (6); an air pipe (10) is provided on the support shaft (1) between the support plate (7) and the turntable (2), and the air pipe (10) is connected to the airbag (9) through the air hole (11) on the support shaft (1).

3. The beveling grinding device for gas pipeline welding according to claim 2, characterized in that: An electric cylinder (13) is installed on the airbag (9) via a pressure plate (12). The piston rod end of the electric cylinder (13) passes through the pressure plate (12), the airbag (9) and is fixedly connected to the end of the support shaft (1).

4. The beveling grinding device for gas pipeline welding according to claim 1, characterized in that: The adjuster consists of a slide (14), a limiting plate (15), an assembly plate (16), and an angle adjusting arm (17). The slide (14) is provided with a limiting plate (15), and the assembly plate (16) is fixedly mounted on the slide (14) outside the limiting plate (15). An angle adjusting arm (17) is installed on the end of the assembly plate (16) through an adjusting bolt (18). The end of the angle adjusting arm (17) is fixedly connected to the grinding stone (6). The slide (14) is slidably connected to the radial groove (8).

5. The beveling grinding device for gas pipeline welding according to claim 4, characterized in that: The slide block (14) is provided with a limit adjustment groove (19); the limit plate (15) is L-shaped, and the end of the limit plate (15) on one side of the slide block (14) is slidably connected to the limit adjustment groove (19); multiple universal balls (20) are provided at intervals on the end of the limit plate (15) on the inner side of the angle adjustment arm (17).

6. The beveling grinding device for gas pipeline welding according to claim 5, characterized in that: A strip hole (21) is provided on the limiting plate (15) on one side of the slide (14). A set screw (22) is threaded on the slide (14). The end of the set screw (22) passes through the strip hole (21), the slide (14) and abuts against the radial groove (8).

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