Tool special for hole alignment of pipeline flange

Abstract

The utility model discloses a special hole aligning tool for a pipeline flange, which comprises two split semi-rings which have magnetism and are attracted together, and the corresponding side surfaces of the two semi-rings are combined surfaces; each semi-ring is provided with a notch communicated with the inner circle of the semi-ring, the number of the notches is equal to that of bolts used for being connected with the flange, openings of the notches face the combination face, the end, away from the combination face, of each notch is an arc-shaped positioning part, and the center distance of the positioning parts is equal to the center distance of holes in the flange. The inner circle diameter of the semi-ring is D1, the outer diameter of the pipeline is D2, the arc diameter of the positioning part is d1, and the diameter of the bolt is d2, so that D1 = D2, and d1 = d2. When the flange is used for connecting pipelines, bolts do not need to penetrate through holes in the flange one by one, all the bolts can be placed on the two semi-rings at a time, and therefore operation is more convenient. During use, all bolts penetrate through the holes in the flange at the same time, and therefore the connecting efficiency of the pipeline flange can be greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of flange connection auxiliary tools, and in particular to a special tool for aligning holes in pipe flanges. Background Technology

[0002] Currently, when connecting pipe valves, the process involves first using the end face of one flange as a reference, aligning the holes of the two flanges, placing a gasket between the two flanges, and then inserting bolts through the holes on both flanges. A nut is tightened after each bolt. All nuts are then tightened to connect the two flanges and complete the pipe connection.

[0003] Because bolts need to be threaded through the flange one by one, and the space at the pipeline site is usually small, the operation is very inconvenient. Therefore, this method of pipe connection is time-consuming, labor-intensive, and has low connection efficiency.

[0004] Patent CN222589620U discloses a tool for flange installation, including: a main frame, a locating pin, an internal threaded head, an adjusting screw, and two parallel arm blocks. The main frame has two mounting holes, and the two parallel arm blocks correspond one-to-one with the two mounting holes. One end of each parallel arm block is fixed inside a mounting hole. The locating pin passes sequentially through the other end of one parallel arm block, the threaded hole of the flange, and the other end of the other parallel arm block. The internal threaded head is located in the middle of the main frame. The adjusting screw is threadedly connected to the internal threaded head. A flat-head block or flat-end block is detachably connected to the end of the adjusting screw near the flange. This tool allows for quick and accurate installation of bolts and gaskets, while reducing human error and safety hazards. However, after the flange is aligned, the bolts need to be passed through the holes on the flange one by one, which reduces the efficiency of the connection. If the flange is in a confined space, aligning the bolts with the holes on the flange becomes even more difficult. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a special tool for aligning pipe flanges, which can solve the problem of time-consuming, labor-intensive and inefficient connection of pipe flanges.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A special tool for aligning pipe flanges includes two split semi-rings that are magnetically attracted to each other, with corresponding sides of the two semi-rings forming mating surfaces. Each semi-ring has a notch communicating with its inner circle, the number of which is equal to the number of bolts used to connect the flange. The openings of the notches all face the mating surfaces, and the end of each notch away from the mating surface is an arc-shaped positioning part. The center distance between the positioning parts is equal to the center distance between the holes on the flange. The inner diameter of the semi-ring is D1, the outer diameter of the pipe is D2, the arc diameter of the positioning part is d1, and the diameter of the bolt is d2, satisfying D1 = D2 and d1 = d2.

[0008] Furthermore, the width of the notch gradually increases along the direction from the positioning part to the mating surface.

[0009] Furthermore, the sides of the notch are two mutually symmetrical planes, both of which are tangent to the arc of the positioning part, and the included angle between the two planes is between 15° and 45°.

[0010] Furthermore, the inner circle end is chamfered.

[0011] Furthermore, the inner circle is provided with a number of grooves spaced apart along the circumferential direction.

[0012] Furthermore, one half-ring has a boss on the mating surface, and the other half-ring has a recess on the mating surface for engaging with the boss.

[0013] Furthermore, the magnetic poles at the ends of the two semi-rings are opposite to those at the mating surfaces.

[0014] The positive effects of this utility model are:

[0015] This invention features two semi-rings made of magnets, each with a notch containing a positioning part for engagement with bolts. When connecting pipes using this invention, bolts do not need to be passed through the flange holes one by one; all bolts can be placed onto the two semi-rings at once, making operation more convenient. The center distance between the positioning parts on the two semi-rings is equal to the center distance between the holes on the flange, and the arc diameter of the positioning part is equal to the outer diameter of the bolt. Therefore, once one bolt is aligned with a hole on the flange, the remaining bolts can be aligned with their corresponding holes, making it easy to align all bolts with the holes on the flange. Since all bolts pass through the flange holes simultaneously, the connection efficiency of the two flanges is greatly improved. Attached Figure Description

[0016] Figure 1 These are schematic diagrams of Examples 1 and 2;

[0017] Figure 2 yes Figure 1 A cross-sectional view of the AA section;

[0018] Figure 3 These are schematic diagrams illustrating the use of Examples 1 and 2;

[0019] Figure 4 This is a schematic diagram of Example 3;

[0020] In the picture:

[0021] 1. Semi-ring; 2. Inner circle; 3. Positioning part; 4. Notch; 5. Boss; 6. Chamfer; 7. Pipe; 8. Bolt; 9. Weld joint; 10. Flange; 11. Nut; 12. Groove; 13. Mating surface. Detailed Implementation

[0022] Example 1

[0023] like Figures 1 to 3 As shown, a special tool for aligning pipe flanges is provided, wherein both flanges 10 to be connected have six holes. The special tool includes two split semi-rings 1, each made of magnets. The corresponding sides of the two semi-rings 1 are mating surfaces 13, and the magnetic poles of the ends of the two semi-rings 1 and the mating surfaces 13 are opposite.

[0024] Each semi-ring 1 has a notch 4 communicating with its inner circle 2. Each flange 10 has three notches 4. The notches 4 on the two flanges 10 are symmetrically arranged on both sides of the mating surface 13. The openings of the notches 4 all face the mating surface 13. The end of each notch 4 away from the mating surface 13 is an arc-shaped positioning part 3. The mating surface 13 is located in the middle of two adjacent positioning parts 3. The center distance of the positioning parts 3 (i.e., the diameter of the circle containing the center of each positioning part 3) is equal to the center distance of the holes on the flange 10 (i.e., the diameter containing the center of each hole on the flange 10). The inner circle 2 of the semi-ring 1 has a diameter of D1, the outer diameter of the pipe 7 has a diameter of D2, the arc diameter of the positioning part 3 has a diameter of d1, and the diameter of the bolt 8 has a diameter of d2. Therefore, D1 = D2 and d1 = d2.

[0025] The working process of this utility model is as follows:

[0026] 1. Place the two flanges 10 to be connected close to each other and align them. Insert a gasket between the two flanges 10 so that the gasket is sandwiched between the two flanges 10.

[0027] 2. Attach the six bolts 8 to the positioning parts 3 on the two semi-rings 1 respectively, with the heads of the bolts 8 pressed against the left end of the semi-rings 1.

[0028] 3. Symmetrically adsorb the two semi-rings 1 onto the outer circle of the pipe 7, with the mating surfaces 13 of the two semi-rings 1 aligned and adsorbed to each other;

[0029] 4. Push both half-rings 1 to the right while simultaneously turning half-rings 1 so that one of the bolts 8 aligns with the hole on one of the flanges 10;

[0030] 5. All six bolts 8 pass through the holes on the flange 10 at the same time. After the right end of the bolt 8 is exposed, put on the flat washer and spring washer in sequence, and then tighten the nut 11.

[0031] 6. Pull the two half-rings 1 outwards, remove the two half-rings 1 from the pipe 7, and tighten the bolts 8.

[0032] Instead of passing each bolt through the holes in the flange 10 individually, all six bolts can be placed on the two semi-rings 1 within a convenient operating space beside the pipe 7, making operation more convenient. Since the center distance of the six positioning parts 3 on the two semi-rings 1 is equal to the center distance of the holes in the flange 10, and the arc diameter of the positioning part 3 is equal to the outer diameter of the bolt 8, as long as one bolt 8 is aligned with a hole in the flange 10, the remaining bolts 8 can also be aligned with their corresponding holes, making it easy to align all six bolts 8 with the holes in the flange 10. Because all six bolts 8 pass through the holes in the flange 10 simultaneously, the connection efficiency of the two flanges 10 is greatly improved.

[0033] Example 2

[0034] The difference between this embodiment and Embodiment 1 is that:

[0035] The notch 4 gradually increases in width along the direction from the positioning part 3 to the mating surface 13. The side of the notch 4 consists of two planes symmetrical about a straight line passing through the center of the arc on the positioning part 3 and perpendicular to the mating surface 13. Both planes are tangent to the arc on the positioning part 3, and the included angle between the two planes is 30 degrees, thus allowing the two semi-rings 1 to be easily removed from the pipe 7. For ease of operation, handles can be welded to the outside of the two semi-rings 1.

[0036] Both inner circles 2 of the two semi-rings 1 are chamfered at their ends. The chamfer 6 is located on the side of the semi-ring 1 facing the flange 10. Therefore, when the semi-ring 1 slides along the axial direction of the pipe 7 on the surface of the pipe 7, it can prevent the small protrusions on the surface of the pipe 7 from obstructing the semi-ring 1, ensuring the normal movement of the semi-ring 1. The chamfer 6 also provides clearance space for the weld joint 9 between the flange 10 and the pipe 7, so that the semi-ring 1 is as close as possible to the flange 10, the exposed length of the bolt 8 thread is longer, and the flat washer, spring washer and nut 11 are easily screwed onto the bolt 8.

[0037] Example 3

[0038] The difference between this embodiment and Embodiment 2 is that:

[0039] Each semi-ring 1 has several grooves 12 spaced along the circumferential direction on its inner circle 2, which reduces the contact area between the semi-ring 1 and the pipe 7, making it easier for the semi-ring 1 to move along the axial direction of the pipe 7.

[0040] One of the semi-rings 1 has a trapezoidal boss 5 on the mating surface 13, and the other semi-ring 1 has a recess on the mating surface 13 for engaging with the boss 5. The engagement of the boss 5 and the recess makes it easier to align the mating surfaces 13 after the two semi-rings 1 are fitted together.

[0041] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. A special tool for aligning holes in pipe flanges, characterized in that, The device includes two magnetically attached split-rings (1) that are attracted to each other. The corresponding sides of the two split-rings (1) are mating surfaces (13). Each split-ring (1) has a notch (4) that communicates with the inner circle (2) of the split-ring (1). The number of notches (4) is equal to the number of bolts (8) used to connect the flange (10). The openings of the notches (4) all face the mating surfaces (13). The end of each notch (4) away from the mating surfaces (13) is an arc-shaped positioning part (3). The center distance of each positioning part (3) is equal to the center distance of the holes on the flange (10). The inner circle (2) diameter of the split-ring (1) is D1, the outer diameter of the pipe (7) is D2, the arc diameter of the positioning part (3) is d1, and the diameter of the bolt (8) is d2. Thus, D1 = D2 and d1 = d2 are satisfied.

2. The special tool for aligning pipe flanges according to claim 1, characterized in that, The width of the notch (4) gradually increases along the direction from the positioning part (3) to the mating surface (13).

3. A special tool for aligning pipe flanges according to claim 2, characterized in that, The side of the notch (4) consists of two mutually symmetrical planes, both of which are tangent to the arc of the positioning part (3), and the included angle between the two planes is between 15° and 45°.

4. A special tool for aligning pipe flanges according to claim 1, characterized in that, The inner circle (2) has a chamfer (6) at its end.

5. A special tool for aligning holes in a pipe flange according to claim 1, characterized in that, The inner circle (2) is provided with a number of grooves (12) at intervals along the circumferential direction.

6. A special tool for aligning pipe flanges according to claim 1, characterized in that, One of the semi-rings (1) has a boss (5) on the mating surface (13), and the other semi-ring (1) has a recess on the mating surface (13) for engaging with the boss (5).

7. A special tool for aligning pipe flanges according to claim 1, characterized in that, The magnetic poles at the ends of the two semi-rings (1) are opposite to those at the joint surface (13).

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