CN115234735A - Connecting structure of HDPE (high-density polyethylene) pipe and using method thereof - Google Patents

Abstract

The invention discloses a connecting structure of an HDPE pipe and a method of using the same. The HDPE pipe and the connecting pipe are connected and locked in the form of a shearing groove and a shearing rib, and the ends of the two connecting pipes that are far away from each other are respectively pressed against each other. The HDPE pipe is at the interface of the connecting part, and the connection of the two HDPE pipes can be realized by metal welding between the two connecting pipes. It can better reduce the deformation of HDPE profiles caused by creep such as temperature and gravity. HDPE pipes and connecting pipes can be processed and formed in the factory respectively, and the corresponding two HDPE pipes can be realized by welding between the two connecting pipes. The welding process is mature and reliable, the speed is fast, the connection effect is guaranteed, the heat dissipation is fast after welding, and the subsequent construction can be carried out as soon as possible.

Description

A connection structure of HDPE pipe and using method thereof

technical field

The invention relates to the technical field of pipeline welding structures. More specifically, the present invention relates to a connection structure of HDPE pipes and a method of using the same.

Background technique

High-density polyethylene HDPE has good heat resistance and cold resistance, good chemical stability; also has high rigidity and toughness, good mechanical strength; dielectric properties, environmental stress cracking resistance is also good. In this century, there has been a revolutionary progress in the field of piping, that is, "replacing steel with plastic". HDPE pipes or fittings are very popular, and are widely used in gas transportation, water supply, sewage, agricultural irrigation, mine fine particle solid transportation, as well as oil field, chemical industry, post and telecommunications and other fields, especially in gas transportation.

HDPE will be melted between 190°C and 0°C. The melting temperature of different raw material grades is slightly different. Using this feature, the melted parts of the HDPE profiles are fully contacted and maintained at an appropriate pressure. The pressure is caused by its own thermal expansion. Produced, the correct connection position, the two can be firmly integrated after cooling. The connection method of HDPE usually adopts two methods: electric hot melt connection and hot melt butt joint. At present, the connection of HDPE pipes or fittings still has the following problems:

1. The currently used hot-melt butt joint method is a socket type, which requires a larger heating plate, the size of which is larger than the outer diameter of the pipe. The heating plate is heated first, and then the heating plate is inserted between the butt pipes, and the temperature is transferred through the heating plate to melt the material. After that, take out the heating plate, and then dock the pipe. In this way, most of the energy will be lost, and the power requirements of the equipment are relatively high; the work efficiency is not high, and the time is relatively long; at the same time, there are many manual tasks, and the quality is difficult to guarantee.

2. When using electrothermal fusion welding, it is necessary to lay hot fuses (sheets) on the pipe wall, and set up socket and socket joints, which will affect the appearance, the power requirements of the equipment are high, and the length of each heating and welding is limited.

SUMMARY OF THE INVENTION

An object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages which will be explained later.

Another object of the present invention is to provide a connection structure of HDPE pipes and a method of using the same, so as to solve the technical problems of low connection efficiency and difficult connection quality of HDPE pipes in the prior art.

In order to achieve these objects and other advantages according to the present invention, a connecting structure of HDPE pipes is provided, wherein a connecting portion is extended at the end of each HDPE pipe, and the outer diameter of the connecting portion is slightly smaller than the outer diameter of the HDPE pipe. The outer surface is provided with a shearing groove, the outer side of the connecting part is sleeved with a connecting pipe, the length of the connecting pipe is the same as that of the connecting part, and the inner side of the connecting pipe is equipped with a shearing rib corresponding to the shearing rib. The pipes are connected by circumferential welding between two corresponding connecting pipes.

Preferably, the shearing grooves are annular grooves arranged around the HDPE pipe, the shearing grooves are arranged at intervals along the length direction of the HDPE pipe, and the shearing ribs are annular ribs disposed corresponding to the annular grooves.

Preferably, the shearing grooves are shearing holes evenly arranged on the outer surface of the HDPE pipe, and the shearing ribs are shearing columns corresponding to the shearing holes.

Preferably, the shearing groove and the shearing rib are screw structures that cooperate with each other.

Preferably, the outer diameter of the connecting pipe is the same as the outer diameter of the HDPE pipe.

Preferably, the HDPE pipe is a two-half Haff connection structure, and the connection pipe is correspondingly arranged as two half of the same segment, and the two half segments are welded along the axial direction of the connection pipe.

Preferably, the outer side of the connecting pipe is also connected with a lifting lug.

The present invention also provides a method for using the connection structure of the HDPE pipe, comprising the following steps:

S1. The connecting part of the HDPE pipe to be connected and the matching connecting pipe are processed and connected in a factory to form a combined structure;

S2, check the connection strength between the connection part and the connection pipe;

S3. Align the two composite structures relative to each other, and weld the two connecting pipes through metal, thereby connecting the two HDPE pipes.

Preferably, in step S1, when processing and connecting the HDPE pipe and the connecting pipe, the connecting pipe is heated to increase the connection effect of the HDPE pipe and the connecting pipe.

Preferably, in step S3, the two combined structures are aligned by setting an alignment device, and the alignment device includes:

The inner diameter of the first limit ring is the same as the outer diameter of the HDPE pipe. The first limit ring is provided with a first limit hole that penetrates through the axial direction, and the first limit hole is in the first limit ring. The upper part is symmetrically arranged with a plurality of holes along the circumference, the first limiting hole is a circular first hole part on the side close to the center of the circle, and a second hole part extends on the side away from the center of the circle. The size of the limit ring in the circumferential direction is smaller than the diameter of the first hole portion, and the length of the second hole portion in the radial direction is consistent with the length of the first hole portion from the inner side wall of the first limit ring;

The second limiting ring, the inner diameter of which is the same as the outer diameter of the HDPE pipe, is assembled from two identical semi-circular rings. The semi-circular ring includes a limiting part and a fastening part, and the limiting part corresponds to all the first The position of the limit hole is respectively provided with a second limit hole, and the second limit hole has a circular structure and is consistent with the size of the first hole;

The plug includes a round rod, the diameter of the round rod is the same as the diameter of the first hole portion, and one end of the round rod is provided with a first locking portion radially outward, and the shape and size of the first locking portion are the same as those of the second locking portion. The hole parts are the same, and the middle part of the outer side of the round rod is provided with a second clamping part at intervals along the axial direction; the second clamping part and the first clamping part are located at opposite ends in the radial direction of the round rod; The distance between the nearest second stopper is greater than the thickness of the first stop ring. In the radial direction of the round rod, the distance between the farthest end of the second stopper and the axis is equal to the outer diameter of the connecting pipe , a latch is passed between each opposite first limiting hole and the second limiting hole, and the most distal end of the second locking portion is used to collide with the outer side wall of the connecting pipe;

When using the alignment device, one of the combined structures to be connected is inserted into the first limit ring, the other of the combined structures is embedded into a semicircle of the second limit ring, and the two combined structures to be The connecting end faces collide, and then a pin is inserted into the second limit hole on the installed semi-circular ring and the first limit hole on the opposite first limit ring to adjust the coaxiality of the two combined structures. When inserting the pin, insert it in the direction that the second detent part preferentially enters the first limit hole until the round rod enters the second limit hole of the second limit ring, and then rotate and continue to move in the axial direction Move the latch forward so that the first locking part enters the second hole of the first limit ring, then install another half ring, and insert a plug into the second limit hole on the other half of the half ring to Install in the same way, push the pin into the first limit hole on the corresponding first limit ring, and then continue to move the pin forward in the axial direction and rotate until it enters a second limit hole and the first stopper Enter into the corresponding second hole, and finally connect tightly through the fastening part between the two semi-circles;

When welding the two connecting pipes, the latches at the corresponding positions are drawn out crosswise to form a welding space.

The present invention includes at least the following beneficial effects: in the connection structure of the HDPE pipe of the present invention, the HDPE pipe and the connecting pipe are connected and locked in the form of cooperation between the shearing groove and the shearing rib, and the ends of the two connecting pipes that are far away from each other are Tighten the interface between the HDPE pipe and the connecting part, and the metal welding between the two connecting pipes can realize the connection of the two HDPE pipes. The stiffness of the pipe can better reduce the deformation of HDPE profiles caused by creep such as temperature and gravity. The HDPE pipe and the connecting pipe can be processed and formed in the factory respectively, and the corresponding two HDPE pipes can be realized by welding between the two connecting pipes. Pipe connection, the welding process is mature and reliable, the speed is fast, the connection effect is guaranteed, the heat dissipation is fast after welding, and the subsequent construction can be carried out as soon as possible.

Other advantages, objects, and features of the present invention will appear in part from the description that follows, and in part will be appreciated by those skilled in the art from the study and practice of the invention.

Description of drawings

1 is a front view structural view of an embodiment of the connection structure of the HDPE pipe of the present invention;

Fig. 2 is the front structural view of the connecting pipe of an embodiment of the connecting structure of the HDPE pipe of the present invention;

3 is a schematic diagram of the exploded structure of the connecting part and the connecting pipe of another embodiment of the connecting structure of the HDPE pipe of the present invention;

FIG. 4 is a front structural view of an alignment device according to an embodiment of the present invention;

5 is a side view structural view of a first limiting ring according to an embodiment of the present invention;

6 is a side view structural view of a second limiting ring according to an embodiment of the present invention;

FIG. 7 is a side structural view of a latch according to an embodiment of the present invention.

Description of the reference numerals in the description: 1. HDPE pipe, 2. Inner side of HDPE pipe, 3. Connecting part, 4. Connecting pipe, 5. Annular groove, 6. Annular rib, 7. Shearing hole, 8. Shearing column, 9, lifting lug, 10, combined structure, 11, first limit ring, 12, first limit hole, 13, first hole portion, 14, second hole portion, 15, second limit ring, 16, Limiting part, 17, Fastening part, 18, Second limiting hole, 19, Bolt, 20, Round rod, 21, First locking part, 22, Second locking part.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present invention, The terms "landscape", "portrait", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", The orientation or positional relationship indicated by "inside" and "outside" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the indicated device or element must have The particular orientation, construction and operation in the particular orientation are therefore not to be construed as limitations of the invention.

As shown in Figures 1-4, the present invention provides a connection structure for HDPE pipes. The end of each HDPE pipe 1 is extended with a connection portion 3. The outer diameter of the connection portion 3 is slightly smaller than the outer diameter of the HDPE pipe 1. The connection portion The outer surface of 3 is provided with a shearing groove, the outer side of the connecting part 3 is sleeved with a connecting pipe 4, the length of the connecting pipe 4 is consistent with the length of the connecting part 3, and the inner side of the connecting pipe 4 is equipped with a shearing rib corresponding to the shearing rib. , the two HDPE pipes 1 to be connected are connected by circumferential welding between the two corresponding connecting pipes 4 .

The connecting pipe 4 is made of metal products, generally aluminum alloy, ordinary aluminum, stainless steel, carbon steel, etc. The HDPE pipe 1 and the connecting pipe 4 are connected and locked in the form of a shear groove and a shear rib, and then through the The connection of the two HDPE pipes 1 can be completed by metal welding between the two connecting pipes 4. After welding, the ends of the two connecting pipes 4 that are far away from each other are respectively smaller in the outer diameter of the connecting part 3 than the limit of the body of the HDPE pipe 1. Under the action, the interface of the HDPE pipe 1 at the connecting part 3 is held up. By arranging the connecting part 3 at the end of the HDPE pipe 1 and sheathing the connecting connecting pipe 4, the rigidity of the original HDPE pipe 1 is increased, and the deformation of the HDPE profile caused by creep such as temperature and gravity can be better reduced. The HDPE pipe 1 and the connecting pipe 4 can be processed and formed in the factory respectively. After passing the inspection, they leave the factory and the connection effect is guaranteed. The connection between the two corresponding HDPE pipes 1 is realized by welding between the two connecting pipes 4. The connecting pipe 4 is For metal products, the welding process is mature and reliable, the speed is fast, the heat dissipation is fast after welding, and the follow-up construction can be carried out as soon as possible.

In another technical solution, as shown in FIGS. 1 and 2 , the shearing grooves are annular grooves 5 arranged around the HDPE pipe 1 , and the shearing grooves are spaced along the length direction of the HDPE pipe 1 . , the shearing rib is the annular rib 6 provided corresponding to the annular groove 5 .

The HDPE pipe 1 itself has a certain toughness, and can be melted between 190° C. and 0° C. depending on the material composition. Pushing the connecting part 3 to the bottom, each annular rib 6 enters an annular groove 5 respectively, so as to lock the connection between the connecting pipe 4 and the HDPE pipe 1. By heating the connecting pipe 4 properly, the HDPE pipe 1 can be properly heated. The connection part 3 produces an appropriate amount of melting, which facilitates and strengthens the connection effect with the connection pipe 4 .

In another technical solution, as shown in FIG. 3 , the shear force grooves are shear force holes 7 evenly arranged on the outer surface of the HDPE pipe 1 , and the shear force ribs are shear force corresponding to the shear force holes 7 . Column 8.

When the connecting pipe 4 is pushed into the connecting portion 3 of the HDPE pipe 1 , each shearing column 8 enters one of the shearing holes 7 to connect the connecting pipe 4 and the HDPE pipe 1 with limit locking.

In another technical solution, the shearing groove and the shearing rib are screw structures that cooperate with each other.

By arranging the matched thread structure, the connecting pipe 4 can be screwed into the connecting part 3 to the top through the thread, and the connection is convenient.

In another technical solution, as shown in FIGS. 1-4 , the outer diameter of the connecting pipe 4 is the same as the outer diameter of the HDPE pipe 1 . The outer diameter of the entire HDPE pipe 1 is the same, and the connected HDPE pipes 1 have a continuous and beautiful appearance, which is also convenient for installation and fixation of the connection of the HDPE pipes 1 during construction.

In another technical solution, the HDPE pipe 1 is a two-half Hough connection structure, and the connecting pipe 4 is correspondingly arranged as two half of the same pipe pieces, and the two half pipe pieces are along the axis of the connecting pipe 4 to welding.

For the HDPE pipes 1 of different structural forms, the corresponding connecting pipe 4 structure is adopted, and the two half connecting pipes 4 are also connected together by metal welding.

In another technical solution, as shown in FIG. 2 , the outer side of the connecting pipe 4 is also connected with a lifting lug 9 . By arranging the lifting lugs 9, the HDPE pipe 1 can be easily moved or lifted as a whole.

The present invention also provides a method for using the connection structure of the HDPE pipe 1, as shown in Figures 1-4, comprising the following steps:

S1. The connecting portion 3 of the HDPE pipe 1 to be connected and the matching connecting pipe 4 are processed and connected in a factory to form a combined structure 10;

S2, check the connection strength between the connection part 3 and the connection pipe 4;

S3. Align the two composite structures 10 relative to each other, and connect the two HDPE pipes 1 by metal welding the two connecting pipes 4 .

The connection between the HDPE profile and the special connection structure can be processed and formed in the factory, and it can be inspected and accepted by drawing. , The operation is simple, the connection is firm and the force is clear, and the appearance is continuous and beautiful.

In another technical solution, in step S1, when processing and connecting the HDPE pipe 1 and the connecting pipe 4, the connecting pipe 4 is heated to increase the connection effect of the HDPE pipe 1 and the connecting pipe 4 .

In another technical solution, as shown in Figures 4-7, in step S3, the two combined structures 10 are aligned by setting an alignment device, and the alignment device includes:

The inner diameter of the first limiting ring 11 is consistent with the outer diameter of the HDPE pipe 1 . The first limiting ring 11 is provided with a first limiting hole 12 penetrating in the axial direction. The first limiting ring 11 is provided with a plurality of them symmetrically along the circumference. The first limiting hole 12 is a circular first hole portion 13 on the side close to the center of the circle, and extends as a second hole portion on the side away from the center of the circle. 14. The size of the second hole portion 14 in the circumferential direction of the first limit ring 11 is smaller than the diameter of the first hole portion 13, and the length of the second hole portion 14 in the radial direction is the distance from the first hole portion 13 to the first limit ring. The length of the inner side wall of 11 is the same;

The second limiting ring 15 has the same inner diameter as the outer diameter of the HDPE pipe 1 and is assembled from two identical semicircular rings. The semicircular ring includes a limiting portion 16 and a fastening portion 17 . The limiting portion 16 A second limiting hole 18 is respectively opened at the positions corresponding to all the first limiting holes 12 , and the second limiting hole 18 has a circular structure and is consistent with the size of the first hole portion 13 ;

The plug 19 includes a round rod 20, the diameter of the round rod 20 is consistent with the diameter of the first hole portion 13, and one end of the round rod 20 is provided with a first latching portion 21 radially outward. The shape and size are consistent with the second hole portion 14 . The outer middle portion of the round rod 20 is provided with a second locking portion 22 at intervals along the axial direction. 21 are located at opposite ends, the distance between the first locking portion 21 and the nearest second locking portion 22 is greater than the thickness of the first limiting ring 11 , in the radial direction of the round rod 20, the second locking portion The distance between the farthest end of 22 and the shaft center is equal to the outer diameter of the connecting pipe 4, and a plug 19 is passed between each opposite first limit hole 12 and the second limit hole 18 and the second locking portion The most distal end of 22 is used to interfere with the outer side wall of the connecting pipe 4;

When using the alignment device, insert one of the combined structures 10 to be connected into the first limiting ring 11 , the other combined structure 10 is embedded into a semicircle of the second limiting ring 15 , and the two The end faces of the combined structure 10 to be connected collide, and then a pin 19 is inserted into the second limit hole 18 on the installed semi-circular ring and the first limit hole 12 on the opposite first limit ring 11 . In order to adjust the coaxiality of the two combined structures 10 , when inserting the pin 19 , the second locking portion 22 preferentially enters the first limiting hole 12 , until the round rod 20 enters the second limiting ring 15 . Then rotate and continue to move the pin 19 forward in the axial direction, so that the first locking portion 21 enters the second hole portion 14 of the first limiting ring 11, and then install another semi-circular ring , insert a pin 19 into the second limit hole 18 on the other half of the semicircle, install it in the same way, push the pin 19 into the first limit hole 12 on the corresponding first limit ring 11, Then continue to move the pin 19 forward in the axial direction and rotate until it enters a second limiting hole 18 and the first locking portion 21 enters the corresponding second hole portion 14, and finally through the fastening between the two semi-circles Part 17 is tightly connected;

When welding the two connecting pipes 4, the pins 19 at the corresponding positions are drawn out crosswise to form a welding space.

According to needs, a plug 19 can be passed through the first limit hole 12 and the second limit hole 18 in each group, and the coaxial collinearity of the two HDPE pipes 1 can be adjusted by using the plug 19 to facilitate the HDPE pipe. 1. The connection is firm and the service life is improved. The lengths of the first detent portion 21 and the second detent portion 22 relative to the radial projection of the round rod 20 are the same, so that the second detent portion 22 can pass through the second detent first. After the hole 14 and the second locking portion 22 come between the first limiting ring 11 and the second limiting ring 15 , the round rod 20 is rotated again so that the first locking portion 21 is located at the position of the second hole 14 . Then enter the second hole portion 14 at the position where it is located, so that the second locking portion 22 is also rotated to be consistent with the radial direction of the HDPE pipe 1, and can withstand and limit the connection pipe 4, and the round rod 20 as a whole passes through. The limiting effect of the second hole portion 14 on the first locking portion 21 prevents rotation. Then, according to the welding requirements, pull out the plug 19 at the place to be welded, so as to avoid hindering the operation of the welding tool. After the welding is completed, pull out all the plugs 19 and remove the first The second limit ring 15, the first limit ring 11 can also be made into a detachable two-half structure or drawn from the corresponding HDPE pipe 1, then the inner wall of the corresponding first limit ring 11 can be made relatively smooth, which is convenient for Sliding on the HDPE pipe 1 , the position of the fastening portion 17 on the second limiting ring 15 is symmetrically arranged relative to the position of the second limiting hole 18 , so as to avoid affecting the position setting of the second limiting hole 18 .

Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (10)

1. a connection structure of HDPE pipe, it is characterized in that, the end of each HDPE pipe is extended with connecting portion, the outer diameter of the connecting portion is slightly smaller than the outer diameter of the HDPE pipe, and the outer surface of the connecting portion is provided with a shear groove, A connecting pipe is sleeved on the outer side of the connecting part. The length of the connecting pipe is the same as that of the connecting part. The inner side of the connecting pipe is equipped with a shearing rib corresponding to the shearing rib. The two HDPE pipes to be connected pass through two corresponding shearing ribs. The connecting pipes are welded and connected in the circumferential direction. 2 . The connection structure of an HDPE pipe according to claim 1 , wherein the shearing groove is an annular groove arranged around the HDPE pipe, and the shearing groove is along the length direction of the HDPE pipe. 3 . The shear ribs are arranged at intervals, and the shear ribs are annular ribs arranged corresponding to the annular grooves. 3. The connection structure of an HDPE pipe according to claim 1, wherein the shearing groove is a shearing hole evenly arranged on the outer surface of the HDPE pipe, and the shearing rib is a corresponding shearing hole Set of shear columns. 4. The connection structure of an HDPE pipe according to claim 1, wherein the shearing groove and the shearing rib are mutually matched thread structures. 5 . The connection structure of an HDPE pipe according to claim 1 , wherein the outer diameter of the connection pipe is the same as the outer diameter of the HDPE pipe. 6 . 6 . The connection structure of an HDPE pipe according to claim 1 , wherein the HDPE pipe is a two-half Hough connection structure, and the connecting pipe is correspondingly arranged as a segment of the same two halves, and the two half pipes are correspondingly arranged. 7 . The sheets are welded along the axial direction of the connecting pipe. 7 . The connection structure of an HDPE pipe according to claim 1 , wherein the outer side of the connection pipe is further connected with a lifting lug. 8 . 8. the using method of the connection structure of a HDPE pipe, is characterized in that, comprises the steps: S1. The connecting part of the HDPE pipe to be connected and the matching connecting pipe are processed and connected in a factory to form a combined structure; S2, check the connection strength between the connection part and the connection pipe; S3. Align the two composite structures relative to each other, and weld the two connecting pipes through metal, thereby connecting the two HDPE pipes. 9. The method for using a connection structure of an HDPE pipe according to claim 8, wherein in step S1, when processing and connecting the HDPE pipe and the connecting pipe, the connecting pipe is heated to increase the The connection effect of the HDPE pipe and the connecting pipe. 10. The method for using a connection structure of an HDPE pipe according to claim 8, wherein in step S3, the two combined structures are aligned by setting an alignment device, and the alignment device comprises: The inner diameter of the first limit ring is the same as the outer diameter of the HDPE pipe. The first limit ring is provided with a first limit hole that penetrates through the axial direction, and the first limit hole is in the first limit ring. The upper part is symmetrically arranged with a plurality of holes along the circumference, the first limiting hole is a circular first hole part on the side close to the center of the circle, and a second hole part extends on the side away from the center of the circle. The size of the limit ring in the circumferential direction is smaller than the diameter of the first hole portion, and the length of the second hole portion in the radial direction is consistent with the length of the first hole portion from the inner side wall of the first limit ring; The second limiting ring, the inner diameter of which is the same as the outer diameter of the HDPE pipe, is assembled from two identical semi-circular rings. The semi-circular ring includes a limiting part and a fastening part, and the limiting part corresponds to all the first The position of the limit hole is respectively provided with a second limit hole, and the second limit hole has a circular structure and is consistent with the size of the first hole; The plug includes a round rod, the diameter of the round rod is the same as the diameter of the first hole portion, and one end of the round rod is provided with a first locking portion radially outward, and the shape and size of the first locking portion are the same as those of the second locking portion. The hole parts are the same, and the middle part of the outer side of the round rod is provided with a second clamping part at intervals along the axial direction; the second clamping part and the first clamping part are located at opposite ends in the radial direction of the round rod; The distance between the nearest second stopper is greater than the thickness of the first stop ring. In the radial direction of the round rod, the distance between the farthest end of the second stopper and the axis is equal to the outer diameter of the connecting pipe , a latch is passed between each opposite first limiting hole and the second limiting hole, and the most distal end of the second locking portion is used to collide with the outer side wall of the connecting pipe; When using the alignment device, one of the combined structures to be connected is inserted into the first limit ring, the other of the combined structures is embedded into a semicircle of the second limit ring, and the two combined structures to be The connecting end faces collide, and then a pin is inserted into the second limit hole on the installed semi-circular ring and the first limit hole on the opposite first limit ring to adjust the coaxiality of the two combined structures. When inserting the pin, insert it in the direction that the second detent part preferentially enters the first limit hole until the round rod enters the second limit hole of the second limit ring, and then rotate and continue to move in the axial direction Move the latch forward so that the first locking part enters the second hole of the first limit ring, then install another half ring, and insert a plug into the second limit hole on the other half of the half ring to Install in the same way, push the pin into the first limit hole on the corresponding first limit ring, and then continue to move the pin forward in the axial direction and rotate until it enters a second limit hole and the first stopper Enter into the corresponding second hole, and finally connect tightly through the fastening part between the two semi-circles; When welding the two connecting pipes, the latches at the corresponding positions are drawn out crosswise to form a welding space.

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