Welding tool for anti-disengaging ring of self-anchored nodular cast iron pipe

Abstract

The utility model discloses a self-anchored nodular cast iron pipe anti-disengaging ring welding tool which comprises a fixed ring, a movable ring and a guide assembly, the fixed ring and the movable ring are connected through the guide assembly, the fixed ring and the movable ring are both arranged to be circular ring pieces with adjusting notches, the two sides of each adjusting notch are connected through a fastening assembly, and the fixed ring is connected with the movable ring through the fastening assembly. The fixed ring and the movable ring are arranged coaxially, and the fixed ring and the movable ring move relatively in the axial direction through the guide assembly; according to the utility model, the welding position is ensured to be fixed in the welding process, the plane of the welding ring can be ensured to be perpendicular to the axial direction of the pipe body, the stress uniformity of the welding anti-falling ring in the pipeline mounting process can be ensured, the concentrated stress of a single point of the welding ring is avoided, and the reliability of pipeline mounting is ensured; and meanwhile, a welding gap in the welding process is fixed, the appearance size of the finally-formed anti-disengaging ring is uniform, the stress requirement is met, and the working difficulty and the working intensity of manual grinding in the later period can be greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of pipe welding technology, specifically to a welding fixture for a self-anchoring ductile iron pipe anti-detachment ring. Background Technology

[0002] Pipe jacking, a trenchless pipeline construction method, is primarily used in current municipal road engineering projects. Compared to traditional open-cut construction, it completely solves the problems of damage to urban buildings and traffic congestion during construction, demonstrating its advantages in soil stabilization and environmental protection. This is particularly important for cities with heavy traffic, dense populations, numerous surface buildings, and complex underground pipelines. With the advancement of urbanization in my country and the increasing emphasis on environmental protection, pipe jacking technology is bound to become a trend in urban underground pipeline construction.

[0003] During the trenchless pipeline laying process, the surrounding soil is compressed, and the pipe wall is also subjected to forces from the surrounding soil. The pipe sections must overcome the friction between the outer wall of the pipe and the soil during the laying process. To ensure the normal laying of the pipeline, the pipe sections are fixed by snap-fit ​​anchoring. In addition, to improve the overall strength of the pipeline, the outer wall is completely covered with a cylindrical fiber concrete protective sleeve.

[0004] However, since the actual pipeline laying length may be uncertain during construction, certain pipe sections may be cut and then welded in a ring on the pipe fittings to form an anti-detachment ring for setting based on specific working conditions. The existing anti-detachment rings for welded spigots of cut pipes can only be formed by manual welding. During welding, the position of the anti-detachment rings often cannot be guaranteed to be on the same plane. At the same time, the dimensional deviation of the anti-detachment rings is relatively large, and they generally need to be ground twice, which can easily affect the dragging force of the pipeline during laying.

[0005] In view of the above-mentioned defects, the creator of this utility model has finally obtained this utility model after a long period of research and practice. Utility Model Content

[0006] To address the aforementioned technical deficiencies, the present invention provides a welding fixture for a self-anchoring ductile iron pipe anti-detachment ring, comprising a fixed ring, a movable ring, and a guide assembly. The fixed ring and the movable ring are connected by the guide assembly. Both the fixed ring and the movable ring are circular rings with adjustment slots. The two sides of the adjustment slots are connected by fastening assemblies, and the fixed ring and the movable ring are coaxially arranged. The fixed ring and the movable ring can move axially relative to each other through the guide assembly. Both the fixed ring and the movable ring are made of copper.

[0007] Preferably, the fastening assembly includes a first fixing block, a second fixing block, a fastening bolt, and a fastening nut. The first fixing block and the second fixing block are respectively fixedly disposed on both sides of the adjusting slot and fixedly connected to the fixing ring or the moving ring. Both the first fixing block and the second fixing block are provided with fastening holes. The fastening bolt passes through the two fastening holes in sequence and is threadedly connected to the fastening nut.

[0008] Preferably, the guiding assembly includes a first outer frame, a second outer frame, and a guide rod. The first outer frame is disposed on the outer circular surface of the fixed ring, and the second outer frame is disposed on the outer circular surface of the movable ring. Both the first and second outer frames are provided with guide holes, which are arranged in a one-to-one correspondence. A guide rod is simultaneously inserted into the two corresponding guide holes, and the guide rod is arranged parallel to the axis of the fixed ring.

[0009] Preferably, both the first outer frame and the second outer frame are provided with at least three guide holes, the guide holes of the first outer frame being evenly distributed in a ring around the axis of the fixed ring, and the guide holes of the second outer frame being evenly distributed in a ring around the axis of the movable ring.

[0010] Preferably, the first outer frame includes a plurality of first connecting plates, the second outer frame includes a plurality of second connecting plates, the first connecting plates are perpendicular to the axis of the fixed ring, the second connecting plates are perpendicular to the axis of the movable ring, and the guide holes are respectively perpendicularly arranged on the corresponding first connecting plates and second connecting plates.

[0011] Preferably, the first outer frame further includes a first positioning plate, and the second outer frame includes a second positioning plate. The first positioning plate is flush with the end face of the fixed ring near the moving ring, and the second positioning plate is flush with the end face of the moving ring near the fixed ring. Both the first positioning plate and the second positioning plate are provided with positioning holes, and the positioning holes on the first positioning plate and the second positioning plate are correspondingly arranged. The positioning rod passes through the two corresponding positioning holes simultaneously, and the positioning rod is provided with a scale along the straight extension direction.

[0012] Preferably, the positioning hole on the first positioning plate is a threaded hole, the positioning hole on the second positioning plate is a through hole, the positioning rod is provided with a threaded section and a scale section, the scale is set on the scale, and the threaded section is threadedly connected to the positioning hole on the first positioning plate.

[0013] Preferably, one end of the positioning rod is provided with a limit block, and the threaded segment is disposed between the limit block and the scale segment.

[0014] Compared with the prior art, the advantages of this utility model are as follows: This utility model ensures that the welding position is fixed during the welding process and that the plane of the welding ring is perpendicular to the axial direction of the pipe body. This ensures the uniformity of the stress on the welded anti-detachment ring during pipeline installation, avoids concentrated stress on a single point of the welding ring, and ensures the reliability of pipeline installation. At the same time, the welding gap is fixed during the welding process, and the final formed anti-detachment ring has uniform dimensions and meets the stress requirements, which can greatly reduce the difficulty and labor intensity of subsequent manual grinding work. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation structure of the welding fixture for the self-anchoring ductile iron pipe anti-detachment ring;

[0016] Figure 2 This is a front view of the structure of the self-anchoring ductile iron pipe anti-detachment ring welding fixture;

[0017] Figure 3 This is a structural view of the fastening assembly;

[0018] Figure 4 This is a view of the connection structure of the positioning rod.

[0019] The numbers in the diagram represent:

[0020] 1-Fixed ring; 2-Moving ring; 3-Adjusting groove; 4-Cast iron pipe; 5-First fixing block; 6-Second fixing block; 7-Fastening bolt; 8-Fastening nut; 9-Guide rod; 10-First connecting plate; 11-Second connecting plate; 12-First positioning plate; 13-Second positioning plate; 14-Positioning rod; 15-Limiting block. Detailed Implementation

[0021] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0022] Example 1

[0023] like Figure 1 As shown, Figure 1 This is a schematic diagram of the safety protection device for the hot-top casting machine.

[0024] The self-anchoring ductile iron pipe anti-detachment ring welding fixture of this utility model includes a fixed ring 1, a movable ring 2, and a guide assembly. The fixed ring 1 and the movable ring 2 are connected by the guide assembly. Both the fixed ring 1 and the movable ring 2 are circular rings with adjusting slots 3 to facilitate the fitting of the fixed ring 1 and the movable ring 2 onto the cast iron pipe 4. The two sides of the adjusting slots 3 are connected by fastening assemblies to fix the fixed ring 1 and the movable ring 2 onto the cast iron pipe 4. The fixed ring 1 and the movable ring 2 are coaxially arranged and can move axially relative to each other through the guide assembly. Both the fixed ring 1 and the movable ring 2 are made of copper.

[0025] This invention involves fitting a fixed ring 1 and a movable ring 2 onto a cast iron pipe 4, and using a guide assembly to coaxially adjust and move the fixed ring 1 and the movable ring 2. This ensures a suitable gap is formed between the fixed ring 1 and the movable ring 2 while adjusting their positions on the cast iron pipe 4. The gap and the outer wall of the bottom of the cast iron pipe 4 form an annular groove structure. An anti-detachment ring is formed by welding within the gap. The softness and good thermal conductivity of copper facilitate the forming and demolding of the anti-detachment ring after welding.

[0026] This invention ensures that the welding position is fixed during the welding process and that the plane of the welding ring is perpendicular to the axial direction of the pipe body. This ensures the uniformity of stress on the welded anti-detachment ring during pipeline installation, avoids concentrated stress on a single point of the welding ring, and ensures the reliability of pipeline installation. At the same time, the welding gap is fixed during the welding process, and the final anti-detachment ring has uniform dimensions and meets the stress requirements, which can greatly reduce the difficulty and labor intensity of subsequent manual grinding work.

[0027] The operation and control of this invention are simpler, reducing manual labor, improving work efficiency, and enhancing the welding quality of the ductile iron pipe anti-detachment ring.

[0028] Example 2

[0029] The fastening assembly includes a first fixing block 5, a second fixing block 6, a fastening bolt 7, and a fastening nut 8. The first fixing block 5 and the second fixing block 6 are respectively fixedly disposed on both sides of the adjusting slot 3 and are fixedly connected to the fixing ring 1 or the moving ring 2. Both the first fixing block 5 and the second fixing block 6 are provided with fastening holes. The fastening bolt 7 passes through the two fastening holes in sequence and is threadedly connected to the fastening nut 8. By adjusting the position of the fastening nut 8 on the fastening bolt 7, the relative position between the first fixing block 5 and the second fixing block 6 can be adjusted, thereby controlling the opening size of the adjusting slot 3, which facilitates the clamping or loosening of the fixing ring 1 and the moving ring 2 on the cast iron pipe 4.

[0030] The guiding assembly includes a first outer frame, a second outer frame, and a guide rod 9. The first outer frame is disposed on the outer circular surface of the fixed ring 1, and the second outer frame is disposed on the outer circular surface of the movable ring 2. Both the first and second outer frames are provided with guide holes, which are arranged in a one-to-one correspondence. The guide rod 9 passes through the two corresponding guide holes simultaneously. The guide rod 9 is arranged parallel to the axis of the fixed ring 1, thereby ensuring that the fixed ring 1 or the movable ring 2 can move axially relative to each other under the action of the guide rod 9.

[0031] Preferably, both the first outer frame and the second outer frame are provided with at least three guide holes. The guide holes of the first outer frame are evenly distributed in a ring around the axis of the fixed ring 1, and the guide holes of the second outer frame are evenly distributed in a ring around the axis of the moving ring 2, thereby ensuring the stability of the relative linear movement of the fixed ring 1 and the moving ring 2.

[0032] Preferably, the first outer frame includes a plurality of first connecting plates 10, and the second outer frame includes a plurality of second connecting plates 11. The first connecting plates 10 are perpendicular to the axis of the fixed ring 1, and the second connecting plates 11 are perpendicular to the axis of the movable ring 2. The guide holes are respectively perpendicularly arranged on the first connecting plates 10 and the second connecting plates 11, thereby realizing the axial guidance of the guide rod 9 by the guide holes.

[0033] Before welding, the present invention is fitted onto the iron pipe. The depth to which the fixing ring 1 is fitted onto the cast iron pipe 4 is determined according to the required position of the anti-detachment ring. After determining the position, the fastening bolt 7 of the fixing ring 1 is tightened to make it fit and fix it to the body of the cast iron pipe 4. The position of the movable ring is adjusted according to the required size of the fixing ring 1. The movable ring is slidable by the guide rod 9 to ensure that the final welded anti-detachment ring has a uniform size. Then, the fastening bolt 7 is tightened to fix the movable ring. After locking, the present invention is fitted and fixed to the cast iron pipe 4. After fixing the present invention, gas shielded welding is used to weld the seam, and the welding position is adjusted by rotating the cast iron pipe 4.

[0034] Example 3

[0035] The first outer frame further includes a first positioning plate 12, and the second outer frame includes a second positioning plate 13. The first positioning plate 12 is flush with the end face of the fixed ring 1 near the moving ring 2, and the second positioning plate 13 is flush with the end face of the moving ring 2 near the fixed ring 1. Both the first positioning plate 12 and the second positioning plate 13 are provided with positioning holes, and the positioning holes on the first positioning plate 12 and the second positioning plate 13 are correspondingly arranged. The positioning rod 14 passes through the corresponding two positioning holes at the same time, and the positioning rod 14 is provided with a scale along the straight extension direction.

[0036] Since the first positioning plate 12 and the second positioning plate 13 are flush with both sides of the gap, the distance between the first positioning plate 12 and the second positioning plate 13 is the width of the gap. The width of the gap is detected by the distance between the first positioning plate 12 and the second positioning plate 13 through the positioning rod 14 with scale, so as to ensure the thickness of the fixed ring 1 formed by welding.

[0037] Preferably, the positioning hole on the first positioning plate 12 is a threaded hole, the positioning hole on the second positioning plate 13 is a through hole, and the positioning rod 14 is provided with a threaded section and a scale section. The scale is set on the scale, and the threaded section is threadedly connected to the positioning hole on the first positioning plate 12. The positioning rod 14 is fixedly set on the first positioning plate 12 through the threaded section, so as to ensure the stable position of the positioning rod 14 when the gap is adjusted, and the gap size can be observed intuitively.

[0038] Generally, a limiting block 15 is provided at one end of the positioning rod 14, and the threaded section is disposed between the limiting block 15 and the scale section. The relative position between the positioning rod 14 and the first positioning plate 12 is stabilized by the relative snap-fit ​​positioning between the limiting block 15 and the first positioning plate 12, thereby ensuring that the scale is stable on one side of the gap, which is more conducive to measuring the size of the gap through the scale.

[0039] The above description is merely a preferred embodiment of the present utility model and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present utility model, all of which will fall within the protection scope of the present utility model.

Claims

1. A welding fixture for a self-anchoring ductile iron pipe anti-detachment ring, characterized in that, It includes a fixed ring, a movable ring, and a guide assembly. The fixed ring and the movable ring are connected by the guide assembly. Both the fixed ring and the movable ring are circular rings with adjustment slots. The two sides of the adjustment slots are connected by fastening assemblies. The fixed ring and the movable ring are coaxially arranged and can move axially relative to each other through the guide assembly.

2. The welding fixture for the self-anchoring ductile iron pipe anti-detachment ring as described in claim 1, characterized in that, The fastening assembly includes a first fixing block, a second fixing block, a fastening bolt, and a fastening nut. The first fixing block and the second fixing block are respectively fixedly disposed on both sides of the adjusting slot and fixedly connected to the fixing ring or the moving ring. Both the first fixing block and the second fixing block are provided with fastening holes. The fastening bolt passes through the two fastening holes in sequence and is threadedly connected to the fastening nut.

3. The welding fixture for the self-anchoring ductile iron pipe anti-detachment ring as described in claim 1, characterized in that, The guiding assembly includes a first outer frame, a second outer frame, and a guide rod. The first outer frame is disposed on the outer circular surface of the fixed ring, and the second outer frame is disposed on the outer circular surface of the movable ring. Both the first and second outer frames are provided with guide holes, which are arranged in a one-to-one correspondence. A guide rod is simultaneously inserted into the two corresponding guide holes, and the guide rod is arranged parallel to the axis of the fixed ring.

4. The welding fixture for the self-anchoring ductile iron pipe anti-detachment ring as described in claim 3, characterized in that, Both the first and second outer frames are provided with at least three guide holes. The guide holes of the first outer frame are evenly distributed in a ring around the axis of the fixed ring, and the guide holes of the second outer frame are evenly distributed in a ring around the axis of the movable ring.

5. The welding fixture for the self-anchoring ductile iron pipe anti-detachment ring as described in claim 3, characterized in that, The first outer frame includes a plurality of first connecting plates, and the second outer frame includes a plurality of second connecting plates. The first connecting plates are perpendicular to the axis of the fixed ring, and the second connecting plates are perpendicular to the axis of the movable ring. The guide holes are respectively perpendicularly arranged on the corresponding first connecting plates and second connecting plates.

6. The welding fixture for the self-anchoring ductile iron pipe anti-detachment ring as described in claim 5, characterized in that, The first outer frame further includes a first positioning plate, and the second outer frame includes a second positioning plate. The first positioning plate is flush with the end face of the fixed ring near the moving ring, and the second positioning plate is flush with the end face of the moving ring near the fixed ring. Both the first positioning plate and the second positioning plate are provided with positioning holes, and the positioning holes on the first positioning plate and the second positioning plate are correspondingly arranged. The positioning rod passes through the two corresponding positioning holes simultaneously, and the positioning rod is provided with a scale along the straight extension direction.

7. The welding fixture for the self-anchoring ductile iron pipe anti-detachment ring as described in claim 6, characterized in that, The positioning hole on the first positioning plate is a threaded hole, the positioning hole on the second positioning plate is a through hole, the positioning rod is provided with a threaded section and a scale section, the scale is set on the scale, and the threaded section is threadedly connected to the positioning hole on the first positioning plate.

8. The welding fixture for the self-anchoring ductile iron pipe anti-detachment ring as described in claim 7, characterized in that, One end of the positioning rod is provided with a limit block, and the threaded section is disposed between the limit block and the scale section.

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