Flange fixing tool for girth welding

Abstract

The utility model discloses a flange fixing tool for girth welding, which is used for assisting welding between a flange and a pipeline connecting sleeve and comprises a fixing base, a positioning cylinder, a driving component and a positioning plate, the positioning cylinder is rotatably mounted on the fixing base, the driving component is used for driving the positioning cylinder to rotate, the positioning plate is vertically mounted on the positioning cylinder, and the driving component is used for driving the positioning cylinder to rotate. The positioning cylinder is sleeved with a compensation sleeve, the flange and the pipeline connecting sleeve are both arranged on the compensation sleeve in a matched and sleeved mode, the end face of the flange is attached to the positioning plate, and the flange is fixedly connected with the positioning plate. According to the flange fixing tool for girth welding, the compensation sleeve is arranged, on one hand, a flange to be welded and a pipeline connecting sleeve are positioned, on the other hand, the welding requirements of flanges of different specifications can be met, universality is improved, and application and popularization are facilitated.

Description

A flange fixing fixture for circumferential welding Technical Field

[0001] This utility model relates to the field of flange welding technology, and in particular, to a flange fixing fixture for circumferential welding. Background Technology

[0002] In pipeline connections, flanges are typically used as connecting components to pipes. During use, a gasket is installed between the two mating flanges to achieve a seal, and then the two mating flanges are secured together using matching bolts and nuts. To facilitate the connection between the pipe and the flange, a metal pipe fitting sleeve is usually welded to the opposite end face of the flange, and then the pipe is fitted onto the pipe fitting sleeve.

[0003] For reliable connection, the connection between the flange and the pipe fitting is generally a circumferential weld. Traditionally, this is done manually. During welding, the flange is laid flat on a horizontal plane, and the pipe fitting is placed vertically in the center hole of the flange. A worker then moves a welding torch around the flange to achieve the circumferential weld. Traditional manual welding cannot guarantee that the central axis of the pipe fitting is perpendicular to the end plane of the flange, thus affecting subsequent installation and the flow of the medium transported within the pipeline. Furthermore, the manual welding method of walking around the flange increases the labor intensity for workers.

[0004] To overcome the aforementioned problems, Chinese patent document CN222154474U discloses a flange welding fixing fixture based on an automatic circumferential welder. The fixture includes an extended clamping end and a flange fixing plate. The extended clamping end is a hollow cylindrical tube. At the end of the extended clamping end near the flange fixing plate, several fixing holes (II) are provided along the annular surface. The flange fixing plate has several rings of holes, with the innermost hole being the first fixing hole, and the outer rings being mounting holes. The size and position of the first and second fixing holes are matched. The extended clamping end and the flange fixing plate are fixed by bolts passing through the first and second fixing holes. This patent document achieves automatic welding, and the flange fixing plate with several mounting holes can accommodate flange welding of various specifications. However, in actual processing, it is necessary to manually keep the flange fixed to ensure that the mounting holes on the flange are aligned with the mounting holes on the flange fixing plate. At the same time, it is also necessary to keep the pipe to be welded coaxial with the flange before welding. The above operations undoubtedly increase the labor intensity and cannot guarantee that the pipe to be welded and the flange are in a good positional relationship. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: In order to overcome the above-mentioned defects in the prior art, a flange fixing fixture for circumferential welding that can reduce labor intensity is provided.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a flange fixing fixture for circumferential welding, used to assist in the welding between the flange and the pipe connection sleeve, including a fixed base, a positioning cylinder, a driving assembly and a positioning plate. The positioning cylinder is rotatably mounted on the fixed base. The driving assembly is used to drive the positioning cylinder to rotate. The positioning plate is vertically mounted on the positioning cylinder. A compensation sleeve is fitted on the positioning cylinder. The flange and the pipe connection sleeve are both fitted on the compensation sleeve. The end face of the flange is in contact with the positioning plate. The flange and the positioning plate are fixedly connected.

[0007] Furthermore, the positioning cylinder is a stepped shaft, and the positioning cylinder includes a fixed section and a sleeve section that are coaxially arranged and connected to each other. The outer diameter of the fixed section is larger than the outer diameter of the sleeve section. The connection between the fixed section and the sleeve section forms a stepped surface. The positioning plate is installed on the fixed section, and the compensation sleeve is fitted on the sleeve section. One end of the compensation sleeve abuts against the stepped surface.

[0008] Furthermore, the positioning cylinder is a one-piece molded structure.

[0009] Furthermore, a connecting edge is formed radially protruding on the outer wall of the fixed section, the positioning plate abuts against the connecting edge, and the positioning plate and the connecting edge are fixedly connected by fasteners.

[0010] Furthermore, the positioning plate has a waist-shaped groove, which is aligned with the mounting hole on the flange. A fastening bolt is installed on the flange, and one end of the fastening bolt passes through the mounting hole and the waist-shaped groove in sequence before a fastening nut is installed.

[0011] Furthermore, the positioning plate is sleeved on the positioning cylinder, the positioning plate has a circular structure, and the length direction of the waist-shaped groove is arranged along the radial direction of the positioning plate.

[0012] Furthermore, the waist-shaped groove has multiple grooves, which are evenly arranged circumferentially on the positioning plate.

[0013] Furthermore, the fixed base includes a base and a support connected to each other, the support being perpendicular to the base, and the positioning cylinder being rotatably mounted on the support.

[0014] Furthermore, the drive assembly includes a motor, a drive wheel, a driven wheel, and a pulley. The base of the motor is fixedly mounted on the base, the drive wheel is fixedly mounted on the output shaft of the motor, the driven wheel is fixedly mounted on the positioning cylinder, and the pulley is simultaneously mounted on the outside of both the drive wheel and the driven wheel.

[0015] The beneficial effects of this utility model are as follows: The flange fixing fixture for circumferential welding of this utility model simultaneously fits the flange to be welded and the pipe connection sleeve onto the compensation sleeve. The compensation sleeve ensures that the flange and the pipe connection sleeve are always in a coaxial state. Compared with the prior art, there is no need to manually adjust the position between the pipe connection sleeve and the flange, which reduces labor intensity. Moreover, the positions of the two are accurately placed. In addition, by replacing the matching compensation sleeve, it can adapt to the welding needs of flanges of different specifications, improve versatility, and facilitate widespread use. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 is a perspective view of the flange fixing fixture for circumferential welding of this utility model;

[0018] Figure 2 is a front view of the flange fixing fixture for circumferential welding shown in Figure 1.

[0019] Figure 3 is a top view of the flange fixing fixture for circumferential welding shown in Figure 1;

[0020] Figure 4 is a cross-sectional view along AA of the flange fixing fixture for circumferential welding shown in Figure 3.

[0021] In the diagram: 100, flange; 101, mounting hole; 200, pipe connection sleeve; 300, fastening bolt; 400, fastening nut; 1, fixed base; 11, base; 12, support seat; 121, through hole; 13, bearing; 2, fixed cylinder; 21, fixed section; 22, sleeve section; 210, stepped surface; 23, connecting edge; 3, drive assembly; 31, motor; 32, driving wheel; 33, driven wheel; 34, pulley; 4, positioning plate; 41, shaped groove; 5, compensation sleeve. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0023] Please refer to Figures 1-4. This utility model provides a flange fixing fixture for circumferential welding, used to assist in the welding between flange 100 and pipe connecting sleeve 200. The flange fixing fixture for circumferential welding includes a fixing base 1, a positioning cylinder 2, a driving assembly 3, and a positioning plate 4. The positioning cylinder 2 is rotatably mounted on the fixing base 1 and is horizontally positioned. The driving assembly 3 is used to drive the positioning cylinder 2 to rotate. The positioning plate 4 is vertically mounted on the positioning cylinder 2. In use, flange 100 and pipe connecting sleeve 200 are sequentially fitted onto the positioning cylinder 2 from the end of the positioning cylinder 2 away from the driving assembly 3, and flange 100 is fixedly mounted on the positioning plate 4. At this time, the pipe connecting sleeve 200 is first spot welded to flange 100. Then, under the action of the driving assembly 3, the positioning cylinder 2 is driven to rotate synchronously with flange 100 and pipe connecting sleeve 200, and the welding is aligned with the joint of flange 100 and pipe connecting sleeve 200. Circumferential welding can be achieved with rotation.

[0024] The fixed base 1 has an "L"-shaped structure and includes a base 11 and a support 12 connected to each other. Both are flat plates. The base 11 is horizontally positioned and used for fixed installation on a bearing surface (e.g., a factory floor). The support 12 is perpendicular to the base 11, and the positioning cylinder 2 is rotatably mounted on the support 12. Specifically, the support 12 has a through hole 121 through which the positioning cylinder 2 rotatably passes. To improve the rotational stability of the positioning cylinder 2, a bearing 13 is provided between the support 12 and the positioning cylinder 2. The outer ring of the bearing 13 is fixedly embedded in the through hole 121, and the inner ring of the bearing 13 is fixedly sleeved on the outside of the positioning cylinder 2. In addition, to improve the support strength of the support 12, the width of the support 12 (i.e., the length along the axial direction of the positioning cylinder 2) is designed to be relatively wide. Two bearings 13 are also provided, and they are respectively installed on opposite sides of the through hole 121.

[0025] In this embodiment, the drive assembly 3 includes a motor 31, a drive wheel 32, a driven wheel 33, and a pulley 34. The motor 31 is fixedly mounted on the base 11. The drive wheel 32 is fixedly mounted on the output shaft of the motor 31. The driven wheel 33 is fixedly mounted on the positioning cylinder 2. The pulley 34 is mounted on the outside of both the drive wheel 32 and the driven wheel 33. During operation, starting the motor 31 drives the drive wheel 32 to rotate. Under the action of the pulley 34, the driven wheel 33 rotates, thereby driving the positioning cylinder 2 to rotate. Furthermore, the outer diameter of the drive wheel 32 is smaller than the outer diameter of the driven wheel 33 to achieve deceleration, which helps control the slow rotation of the positioning cylinder 2 and improves the quality of the circumferential seam.

[0026] The positioning cylinder 2 is a stepped shaft, comprising a fixed section 21 and a fitting section 22 connected to each other. The fixed section 21 and the fitting section 22 are coaxially arranged, and the outer diameter of the fixed section 21 is larger than the outer diameter of the fitting section 22. A stepped surface 210 is formed at the connection between the fixed section 21 and the fitting section 22. In use, the fixed section 21 is rotatably connected to the support seat 12 of the fixed base 1. The positioning plate 4 is fixedly installed on the fixed section 21, and the flange 100 to be welded and the pipe connection sleeve 200 are fitted onto the fitting section 22. In this embodiment, the positioning cylinder 2 is a one-piece molded structure, which facilitates processing and also helps enterprises save production costs.

[0027] In this embodiment, a compensation sleeve 5 is detachably fitted onto the outside of the sleeve section 22. The compensation sleeve 5 is a sleeve-shaped structure with both ends through it. The inner wall of the compensation sleeve 5 cooperates with the outer wall of the sleeve section 22, and the outer wall of the compensation sleeve 5 cooperates with the inner walls of the flange 100 and the pipe connection sleeve 200. Thus, the compensation sleeve 5 can be fitted onto the sleeve section 22 from the end away from the fixed section 21, and one end of the compensation sleeve 5 abuts against the stepped surface 210 to achieve positioning. Then, the flange 100 and the pipe connection sleeve 200 are sequentially fitted onto the compensation sleeve 5. It should be noted that the flange 100 and the pipe connection sleeve 200 to be welded in this utility model have the same inner diameter. Therefore, when both the flange 100 and the pipe connection sleeve 200 are fitted onto the sleeve section 22, the flange 100 and the pipe connection sleeve 200 will inevitably be in a coaxial state, ensuring that they are aligned during welding.

[0028] When the inner diameter of the flange 100 to be welded and the pipe connection sleeve 200 changes, the user only needs to fit the matching compensation sleeve 5 of the corresponding size onto the fitting section 22, which improves the versatility of the fixing fixture of this utility model. It should be noted that the multiple matching compensation sleeves 5 used for replacement all have the same inner diameter and fit with the fitting section 22, and their outer diameter matches the inner diameter of the flange 100 to be welded.

[0029] The positioning plate 4 has a waist-shaped groove 41, which is aligned with the mounting hole 101 on the flange 100. When the flange 100 is fitted onto the compensation sleeve 5, the end face of the flange 100 is in contact with the positioning plate 4. A fastening bolt 300 is installed on the flange 100. One end of the fastening bolt 300 passes through the mounting hole 101 and the waist-shaped groove 41 in sequence and is then fitted with a fastening nut 400. In this way, the locking relationship between the flange 100 and the positioning plate 4 is achieved through the mutual cooperation of the fastening bolt 300 and the fastening nut 400.

[0030] In this embodiment, the positioning plate 4 is sleeved on the positioning cylinder 2. The positioning plate 4 has a circular structure, and the length direction of the waist-shaped groove 41 is arranged radially along the positioning plate 4. There are multiple waist-shaped grooves 41, which are evenly arranged circumferentially on the positioning plate 4. In this way, locking between multiple points can be achieved, improving the connection reliability between the flange 100 and the positioning plate 4.

[0031] In this embodiment, a connecting edge 23 is radially protruding on the outer wall of the fixing section 21 of the positioning cylinder 2. The positioning plate 4 abuts against the connecting edge 23. The positioning plate 4 and the connecting edge 23 are fixedly connected by fasteners such as bolts or screws. In this way, the user can replace the positioning plate 4 according to the size of the flange 100 to be welded and the position of the mounting hole 101 on it, so as to lock the flange 100 on the positioning plate 4.

[0032] This utility model discloses a flange fixing fixture for circumferential welding. The flange 100 to be welded and the pipe connection sleeve 200 are simultaneously fitted onto the compensation sleeve 5. The compensation sleeve 5 ensures that the flange 100 and the pipe connection sleeve 200 are always in a coaxial state. Compared with the prior art, there is no need to manually adjust the position between the pipe connection sleeve 200 and the flange 100, which reduces labor intensity. Moreover, the positions of the two are accurately placed. In addition, by replacing the matching compensation sleeve 5, it can adapt to the welding needs of flanges 100 of different specifications, improve versatility, and facilitate widespread use.

[0033] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A flange fixing fixture for circumferential welding, used to assist in the welding between the flange and the pipe connection sleeve, characterized in that: The device includes a fixed base, a positioning cylinder, a drive assembly, and a positioning plate. The positioning cylinder is rotatably mounted on the fixed base. The drive assembly drives the positioning cylinder to rotate. The positioning plate is vertically mounted on the positioning cylinder. A compensation sleeve is fitted on the positioning cylinder. A flange and a pipe connection sleeve are fitted onto the compensation sleeve. The end face of the flange is in contact with the positioning plate. The flange and the positioning plate are fixedly connected.

2. The flange fixing fixture for circumferential welding as described in claim 1, characterized in that: The positioning cylinder is a stepped shaft, which includes a fixed section and a sleeve section that are coaxially arranged and connected to each other. The outer diameter of the fixed section is larger than the outer diameter of the sleeve section. The connection between the fixed section and the sleeve section forms a stepped surface. The positioning plate is installed on the fixed section, and the compensation sleeve is fitted on the sleeve section. One end of the compensation sleeve abuts against the stepped surface.

3. The flange fixing fixture for circumferential welding as described in claim 2, characterized in that: The positioning cylinder is a one-piece molded structure.

4. The flange fixing fixture for circumferential welding as described in claim 2, characterized in that: A connecting edge is formed radially protruding on the outer wall of the fixed section. The positioning plate abuts against the connecting edge, and the positioning plate and the connecting edge are fixedly connected by fasteners.

5. The flange fixing fixture for circumferential welding as described in claim 1, characterized in that: The positioning plate has a waist-shaped groove, which is aligned with the mounting hole on the flange. A fastening bolt is installed on the flange, and one end of the fastening bolt passes through the mounting hole and the waist-shaped groove in sequence before a fastening nut is installed.

6. The flange fixing fixture for circumferential welding as described in claim 5, characterized in that: The positioning plate is sleeved on the positioning cylinder. The positioning plate has a circular structure, and the length direction of the waist-shaped groove is arranged along the radial direction of the positioning plate.

7. The flange fixing fixture for circumferential welding as described in claim 6, characterized in that: The waist-shaped groove has multiple grooves, which are evenly arranged circumferentially on the positioning plate.

8. The flange fixing fixture for circumferential welding as described in claim 1, characterized in that: The fixed base includes a base and a support connected to each other, the support being perpendicular to the base, and the positioning cylinder being rotatably mounted on the support.

9. The flange fixing fixture for circumferential welding as described in claim 8, characterized in that: The drive assembly includes a motor, a drive wheel, a driven wheel, and a pulley. The base of the motor is fixedly mounted on the base. The drive wheel is fixedly mounted on the output shaft of the motor. The driven wheel is fixedly mounted on the positioning cylinder. The pulley is mounted on the outside of both the drive wheel and the driven wheel.

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