Coating composite steel pipe with quick connecting assembly and connecting method of coating composite steel pipe

Abstract

The invention discloses a coating composite steel pipe with quick connecting assemblies and a connecting method thereof, and relates to the technical field of composite steel pipes, the coating composite steel pipe comprises connecting pipes used for conveying geothermal energy, and further comprises the quick connecting assemblies used for quickly installing the two connecting pipes. By means of the quick connecting assembly, when two connecting pipes are connected, the phenomenon that pipelines cannot be connected due to the fact that the centers of the placed connecting pipes are uneven due to the uneven ground can be avoided at the connecting position, quick connection can be guaranteed, after connection is completed, the connecting pipes can be calibrated in a simple and convenient mode, and the connecting efficiency is improved. According to the floor heating pipe, the connecting pipes are made to be in a relatively aligned state, then filling is carried out in other modes, so that additional damage to the quick connecting assembly cannot be caused by medium circulation at the initial stage of use of the floor heating pipe, and the floor heating pipe is generally used for a long time; by means of the quick connection assembly, the phenomenon that extra stress is generated on the connection assembly due to bottom surface sedimentation in the subsequent use process can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of composite steel pipes, and in particular to a coated composite steel pipe with a quick-connect assembly and a connection method thereof. Background Art

[0002] In the process of geothermal energy transmission, it is often transported through multi-section connected steel pipes with composite coatings. The steel pipes are often set at a certain depth underground. However, when the steel pipes are connected, the foundation of the placement position needs to be calibrated to avoid large height errors between the docked steel pipes, which causes greater pressure at the connection. (During installation, the flatness of the pipeline support foundation is very important. If the foundation is uneven, it may cause uneven force on the pipeline, affecting the connection quality, and if the error is large, the threads between the steel pipes cannot be docked, which will directly lead to the inability to connect.) Therefore, when connecting, the installation environment requirements are high, and in the later use process, since the steel pipe is mainly used to transport floor heating, the temperature in the geothermal energy system changes greatly, the metal pipe will generate stress due to thermal expansion and contraction, which may cause the connection to loosen or be damaged) and the soil will inevitably settle. The foundation settlement may cause the pipeline to be misaligned, which in turn causes stress on the connection, which may cause leakage or damage. Due to the limitations of the threaded connection method, if local settlement occurs, the stress on the connection will increase, thereby accelerating the damage to the connection. Summary of the Invention

[0003] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too simple and provides a solution that is significantly different from the existing technology. The embodiment of the present invention provides a coated composite steel pipe with a quick-connect assembly and a connection method thereof to solve the technical problems that when the existing composite steel pipes are connected by threads, the flatness of the connection position is high and self-adjustment of the flatness cannot be performed. Secondly, after the connection is completed, if the ground subsidence occurs subsequently, it will generate greater stress on the connection, which is easy to accelerate the damage of the connection.

[0004] An embodiment of the present invention adopts the following technical solution: a coated composite steel pipe with a quick-connect assembly and a connection method thereof, including a connecting pipe for transporting geothermal energy, and also including a quick-connect assembly for quickly installing two connecting pipes, the end of the connecting pipe is provided with a connecting thread, and a plurality of limiting grooves are provided on the thread, the quick-connect assembly includes a floating male connecting mechanism, a mating mechanism for adjusting the position of the connecting pipe in the male connecting mechanism, and a female connecting mechanism for cooperating with the mating mechanism to adjust the position of the connecting pipe arranged in the male connecting mechanism.

[0005] Furthermore, the limiting grooves provided on the connecting pipe are distributed in a spiral pattern along the thread.

[0006] Furthermore, the male connection mechanism includes a male threaded sleeve, the inner surface of which is provided with a thread connected to the connecting pipe thread, a through mating groove is provided on one side of the male threaded sleeve, and a control groove is provided on the other side of the male threaded sleeve, a threaded pressing block is threadedly connected to the control groove, and a mating block is provided in the control groove, a clamping block is provided below the mating block, and a reset spring block is connected between the clamping block and the mating block.

[0007] Furthermore, the length of the threaded pressing block is three-quarters of the threaded pressing block, and one end of the threaded pressing block located in the matching groove is not threaded. The outer surface of the locking block is made of plastic rubber material, so that the locking block and the matching groove fit tightly. The locking block is used in conjunction with the limiting groove opened on the thread of the connecting pipe.

[0008] Furthermore, the female connection mechanism includes a female connection ring, which is first plugged into the connecting pipe. The female connection ring is provided with a locking bolt for locking the connected connecting pipe. The locking bolt is used in conjunction with the limiting groove. The female connection ring is hollow, and an inner separating ring is provided inside the female connection ring. A through groove is provided in the inner separating ring. Several inclined deflection contact plates are provided in the female connection ring through a rotating rod, and an arc-shaped pressing block connected to the through groove is provided on one side of the deflection contact block.

[0009] Furthermore, a plurality of the deflection and interference blocks form a ring.

[0010] Furthermore, the mating mechanism includes a mating ring, which is connected to the male threaded sleeve through a thread, and a plurality of sliding sleeve rods are provided on the mating ring, the movable end of the sliding sleeve rod is located in the mating groove, and a plurality of sliding grooves are opened in the mating ring. A pull ring is provided on the outside of the mating ring, and the pull ring is connected to one side of the fixed end of the sliding sleeve rod through the sliding groove. A pressing ring is provided on the other side of the fixed end of the sliding sleeve rod, and the pressing ring is located in the female connecting ring and on one side of the arc-shaped pressing block.

[0011] Furthermore, the contact surface between the pressing ring and the arc-shaped pressing block is an arc surface.

[0012] A method for connecting a coated composite steel pipe with a quick-connect assembly comprises the following steps: S1. First, the quick-connect assembly is placed between two composite steel pipes, and the threads of the male threaded sleeve are threadedly connected to the threads of the composite steel pipes to lock the quick-connect assembly in position; S2. Insert the female connecting ring into the thread of another composite steel pipe to be butted. If the centers of the two steel pipes are not aligned during the butt joint, the female connecting ring will cause the deflection abutment block therein to deflect during the insertion process, thereby driving the arc-shaped pressing block to protrude from the through groove; S3. Lock the female connecting ring and the locking bolt using the locking bolt on the female connecting ring; S4. Pull the pull ring. If the connecting pipe is not in a horizontal state, the pull ring will drive the pressing ring to move, which will conflict with the annular pressing block to reset it, thereby aligning the center of the two steel pipes to avoid the height difference between the two steel pipes during installation, which will affect the flow of the medium. S5. After the adjustment is completed, the height difference generated during the calibration process is supplemented by filling or other methods; S6. Push the pull ring to reset the pressing ring indirectly connected to the pull ring, so that there can be a certain height difference between the two steel pipes in the later process, thereby avoiding land subsidence. Then rotate the threaded pressing block to make the locking block fit into the limiting groove, so as to avoid the loosening of the thread during the later medium circulation process, which affects the stability of the pipeline connection.

[0013] Compared with the prior art, the present invention has the following beneficial effects: First, during use, it is necessary to explain the problems that exist in the process of pipe connection. The first problem point is that the ground is horizontal when the pipes are connected, resulting in the center lines of the two pipes not overlapping, so that there will be a certain gap between the pipe openings. At this time, when the quick-connect assembly is used for connection, the phenomenon of uneven connection pipe openings due to uneven ground can be ignored (the existing connection is generally directly through threaded connection or flange connection. Threaded connection has high requirements for connection levelness and gap difference. Similarly, flange connection is also locked by bolts. During the bolt locking process, there are also requirements for connection centerness). When the quick-connect assembly is used for connection, even if there are errors at both ends, the male and female connection mechanisms in the quick-connect assembly can be connected to the corresponding connecting pipes, which reduces the connection requirements. Secondly, after the connection is completed, through the matching mechanism, if there is an error between the connecting pipes, the connecting pipe with the error can be adjusted to calibrate its center line (although the pipes can be connected, but during the flow of the medium, if there is a gap difference between the pipes, it will cause the medium to additionally flush the quick-connect assembly, affecting the life of the quick-connect assembly). Therefore, through calibration, the service life of the quick-connect assembly can be guaranteed, and this calibration mode is relatively portable. You only need to pull the pull ring to move it to the other end, which is simple to operate; After the installation is completed, the phenomenon of ground settlement must also be taken into consideration. If the quick-connect assembly is a hard connection, when the ground settles, the connecting pipe will forcibly squeeze the connecting part, causing the stress on the connecting part to increase. Over time, this will cause the connecting part to deform, thus affecting the connection effect. However, at this time, after the calibration is completed through the quick-connect assembly in this case, the pull ring can be reset so that there is still displacement space between the connecting pipe and the connecting pipe, thereby avoiding the stress caused by the connecting pipe to the quick-connect assembly and improving the service life of the connecting pipe and the quick-connect assembly.

[0014] Through the quick-connect assembly in this case, when connecting two connecting pipes, the phenomenon that the pipes cannot be connected due to the uneven center of the connecting pipe caused by the uneven ground can be avoided at the connection point, ensuring quick connection. Secondly, when the connection is completed, the connecting pipe can be calibrated in a relatively simple way so that the connecting pipes are in a relatively aligned state, and then filled by other means so that the medium circulation at the beginning of use will not cause additional damage to the quick-connect assembly. Secondly, floor heating pipes are generally used for a long time. The quick-connect assembly can also avoid the phenomenon of additional stress on the connecting assembly due to bottom settlement during subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic structural diagram of the quick-connect assembly of the present invention; Figure 3 This is a schematic diagram of the exploded structure of the male connection mechanism of the present invention; Figure 4 For the present invention Figure 3 A in the middle is an enlarged structural diagram; Figure 5 Schematic diagram of the overall structure of the quick-connect assembly of the present invention; Figure 6 This is a schematic cross-sectional structural diagram of the female connection mechanism of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle; Figure 8 It is a schematic diagram of the overall cross-sectional structure of the quick-connect assembly of the present invention; Figure 9 It is a schematic diagram of the overall structure of the deflection contact plate of the present invention.

[0017] Reference numerals: 1. Connecting tube; 2. Male connecting mechanism; 21. Matching block; 22. Threaded pressing block; 23. Reset spring block; 24. Engaging block; 25. Restriction groove; 26. Male threaded sleeve; 27. Matching groove; 3. Matching mechanism; 31. Sliding sleeve rod; 32. Matching ring; 33. Pull ring; 34. Pressing ring; 35. Slide groove; 4. Female connecting mechanism; 41. Through groove; 42. Female connecting ring; 43. Arc-shaped pressing block; 44. Rotating rod; 45. Deflection contact plate; 46. Inner separating ring. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0020] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0023] The following combination Figures 1 to 9 As shown, an embodiment of the present invention provides a coated composite steel pipe with a quick-connect assembly and a connection method thereof, including a connecting pipe 1 for transporting geothermal energy, and also including a quick-connect assembly for quickly installing two connecting pipes 1. The end of the connecting pipe 1 is provided with a connecting thread, and a plurality of limiting grooves 25 are provided on the thread. The quick-connect assembly includes a floating male connecting mechanism 2, a matching mechanism 3 for adjusting the position of the connecting pipe 1 in the male connecting mechanism 2, and a female connecting mechanism 4 for cooperating with the matching mechanism 3 to adjust the position of the connecting pipe 1 set in the male connecting mechanism 2.

[0024] Specifically, the limiting grooves 25 provided on the connecting pipe 1 are distributed in a spiral shape along the thread.

[0025] During operation, due to the provision of multiple limiting grooves 25, after the male threaded sleeve 26 and the connecting pipe 1 are connected, as long as the thread is twisted until it cannot move, the corresponding limiting groove 25 and the locking block 24 will match. Because the actual movement amount of the thread does not change after one circle, and the number of threads that can be screwed on the male threaded sleeve 26 is also constant, when it cannot be screwed, it means that it has moved into place. At this time, a limiting groove 25 can be opened on the corresponding connecting pipe 1 to ensure that it can be locked.

[0026] Specifically, the male connection mechanism 2 includes a male threaded sleeve 26, the inner surface of which is provided with a thread threadedly connected to the connecting pipe 1, a mating groove 27 is provided on one side of the male threaded sleeve 26, and a control groove is provided on the other side of the male threaded sleeve 26, a threaded pressing block 22 is threadedly connected to the control groove, and a mating block 21 is provided in the control groove, a clamping block 24 is provided below the mating block 21, and a reset spring block 23 is connected between the clamping block 24 and the mating block 21.

[0027] Specifically, the length of the threaded pressing block 22 is three-quarters of the threaded pressing block 22, and one end of the threaded pressing block 22 located in the matching groove 27 is not threaded. The outer surface of the locking block 24 is made of plastic rubber material, so that the locking block 24 and the matching groove 27 fit tightly together. The locking block 24 is used in conjunction with the limiting groove 25 provided on the thread of the connecting pipe 1.

[0028] During operation, because rotating the threaded pressing block 22 actually pressurizes the liquid in the fitting groove 27, it is necessary to ensure sealing. At this time, plastic rubber is filled on the surface of the locking block 24 and a non-through thread is set to ensure the overall sealing.

[0029] Specifically, the female connecting mechanism 4 includes a female connecting ring 42, which is first plugged into the connecting pipe 1. The female connecting ring 42 is provided with a locking bolt for locking the connected connecting pipe 1. The locking bolt is used in conjunction with the limiting groove 25. The female connecting ring 42 is hollow, and an inner separating ring 46 is provided in the female connecting ring 42. A through groove 41 is provided in the inner separating ring 46. Several inclined deflection contact plates 45 are provided in the female connecting ring 42 through a rotating rod 44, and an arc-shaped pressing block 43 connected to the through groove 41 is provided on one side of the deflection contact block.

[0030] Specifically, a plurality of the deflection and interference blocks form a ring.

[0031] Since the deflection resistance block forms a ring, when a certain point protrudes, it will push the deflection resistance block corresponding to the point to deflect.

[0032] Specifically, the mating mechanism 3 includes a mating ring 32, which is connected to the male threaded sleeve 26 through a thread, and a plurality of sliding sleeve rods 31 are provided on the mating ring 32. The movable end of the sliding sleeve rod 31 is located in the mating groove 27. A plurality of sliding grooves 35 are provided in the mating ring 32. A pull ring 33 is provided on the outside of the mating ring 32. The pull ring 33 is connected to one side of the fixed end of the sliding sleeve rod 31 through the sliding groove 35. A pressing ring 34 is provided on the other side of the fixed end of the sliding sleeve rod 31, and the pressing ring 34 is located in the female connecting ring 42 and on one side of the arc-shaped pressing block 43.

[0033] Specifically, the contact surface between the pressing ring 34 and the arc-shaped pressing block 43 is an arc surface.

[0034] Working principle: First, place the quick-connect assembly between the two composite steel pipes, and use the thread of the male threaded sleeve 26 to threadedly connect with the thread of the composite steel pipe to lock the position of the quick-connect assembly, and then insert the female connecting ring 42 into the thread of the other composite steel pipe that needs to be docked. During the docking process, if the centers of the two steel pipes are not aligned, the female connecting ring 42 will cause the deflection resistance block therein to deflect during the insertion process, thereby driving the arc-shaped pressing block 43 to protrude from the through groove 41. (Because the centers of the male threaded sleeve 26 and the female connecting ring 42 are aligned during use, and when the two connecting pipes 1 are docked, the two The center lines of the connecting pipes 1 are not aligned, so there will be a certain position of the connecting pipe 1 that will interfere with the deflection interference block and cause it to deflect. However, since the deflection interference block is tilted in the initial state, when it is deflected, the deflection direction is fixed, thereby ensuring that the deflected interference block will drive the arc-shaped pressing block 43 to pass through the through groove 41), and then the female connecting ring 42 is locked with the locking bolt through the locking bolt on the female connecting ring 42. When pulling the pull ring 33, if the docked connecting pipe 1 is not in a horizontal state, pulling the pull ring 33 will drive the pressing ring 34 to move, and the movement of the pull ring 33 will pull the fixed end of the sliding sleeve rod 31 connected to it to move , and the fixed end of the sliding sleeve rod 31 is connected to the pressing ring 34. At this time, the pressing ring 34 will move synchronously, and the movement of the pressing ring 34 will conflict with the arc-shaped pressing block 43 to reset it. Since the arc-shaped pressing block 43 is connected to the deflection resistance block, the reset of the arc-shaped pressing block 43 will drive the deflection resistance plate 45 connected thereto to reset. Since the deflection resistance block is connected to the connecting pipe 1, when the deflection resistance block is reset, it will push the connecting pipe 1 to move until the two connecting pipes 1 are pushed to the same center, thereby calibrating the two connecting pipes 1 and avoiding the height difference between the two steel pipes during installation, which affects the flow of the medium (in the process of pulling, it can be used to Assist external force to pull, avoid manual pulling cannot pull normally), when the adjustment is completed, the height difference generated in the calibration process is supplemented by filling or other methods, and then the pull ring 33 is reset to ensure that the quick-connect assembly reduces the impact of settlement. When resetting, the pull ring 33 is pushed at this time, so that the pressing ring 34 indirectly connected to the pull ring 33 is reset, so that a certain height difference can be created between the two steel pipes in the later process, thereby avoiding land settlement, and then rotating the threaded pressing block 22 so that the locking block 24 is stuck in the limiting groove 25, so as to avoid the loosening of the thread during the later medium circulation process, affecting the stability of the pipeline connection.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coated composite steel pipe with a quick-connect assembly, comprising a connecting pipe (1) for conveying geothermal energy, characterized in that; The invention also includes a quick-connect assembly for quickly installing two connecting pipes (1), wherein the end of the connecting pipe (1) is provided with a connecting thread, and a plurality of limiting grooves (25) are provided on the thread. The quick-connect assembly includes a male connecting mechanism (2) that can be arranged floatingly, a matching mechanism (3) for adjusting the position of the connecting pipe (1) in the male connecting mechanism (2), and a female connecting mechanism (4) for matching the matching mechanism (3) to adjust the position of the connecting pipe (1) arranged in the male connecting mechanism (2).

2. The coated composite steel pipe with a quick-connect assembly according to claim 1, characterized in that; The limiting grooves (25) provided on the connecting pipe (1) are distributed in a spiral pattern along the thread.

3. The coated composite steel pipe with a quick-connect assembly according to claim 1, characterized in that; The male connection mechanism (2) comprises a male threaded sleeve (26), the inner surface of the male threaded sleeve (26) is provided with a thread threadedly connected to the connecting pipe (1), one side of the male threaded sleeve (26) is provided with a through-fitting groove (27), the other side of the male threaded sleeve (26) is provided with a control groove, a threaded pressing block (22) is threadedly connected to the control groove, and a fitting block (21) is provided in the control groove, a snap-fit block (24) is provided below the fitting block (21), and a return spring block (23) is connected between the snap-fit block (24) and the fitting block (21).

4. The coated composite steel pipe with a quick-connect assembly according to claim 3, characterized in that: The threaded pressing block (22) has a threaded length of three quarters of the threaded pressing block (22). One end of the threaded pressing block (22) located in the matching groove (27) does not have a threaded portion. The outer surface of the engaging block (24) is made of plastic rubber material, so that the engaging block (24) and the matching groove (27) are tightly matched. The engaging block (24) is used in conjunction with a limiting groove (25) provided on the thread of the connecting pipe (1).

5. The coated composite steel pipe with a quick-connect assembly according to claim 1, characterized in that; The female connection mechanism (4) includes a female connection ring (42), and the female connection ring (42) and the connection pipe (1) are first plug-connected. The female connection ring (42) is provided with a locking bolt for locking the connected connection pipe (1), and the locking bolt is used in conjunction with the limiting groove (25). The female connection ring (42) is hollow, and an inner separation ring (46) is provided in the female connection ring (42). A through groove (41) is provided in the inner separation ring (46). A plurality of inclined deflection contact plates (45) are provided in the female connection ring (42) through a rotating rod (44), and an arc-shaped pressing block (43) connected to the through groove (41) is provided on one side of the deflection contact block.

6. The coated composite steel pipe with a quick-connect assembly according to claim 5, characterized in that; A plurality of the deflection and interference blocks form a ring.

7. The coated composite steel pipe with a quick-connect assembly according to claim 1, characterized in that; The mating mechanism (3) includes a mating ring (32), the mating ring (32) is connected to the male threaded sleeve (26) through a thread, and a plurality of sliding sleeve rods (31) are provided on the mating ring (32), the movable end of the sliding sleeve rod (31) is located in the mating groove (27), a plurality of sliding grooves (35) are provided in the mating ring (32), a pull ring (33) is provided outside the mating ring (32), the pull ring (33) is connected to one side of the fixed end of the sliding sleeve rod (31) through the sliding groove (35), and a pressing ring (34) is provided on the other side of the fixed end of the sliding sleeve rod (31), and the pressing ring (34) is located in the female connecting ring (42) and on one side of the arc-shaped pressing block (43).

8. The coated composite steel pipe with a quick-connect assembly according to claim 7, characterized in that; The contact surface between the pressing ring (34) and the arc-shaped pressing block (43) is an arc surface.

9. A method for connecting coated composite steel pipes with a quick-connect assembly, characterized in that: The following steps are involved: S1. First, the quick-connect assembly is placed between two composite steel pipes, and the threads of the male threaded sleeve (26) are threadedly connected to the threads of the composite steel pipes, thereby locking the quick-connect assembly in position; S2. Insert the female connecting ring (42) into the thread of another composite steel pipe to be butted. If the centers of the two steel pipes are not aligned during the butt joint, the female connecting ring (42) will cause the deflection resistance block therein to deflect during the insertion process, thereby driving the arc-shaped pressing block (43) to protrude from the through groove (41); S3, locking the female connecting ring (42) and the locking bolt through the locking bolt on the female connecting ring (42); S4. Pull the pull ring (33). If the butted connecting pipe (1) is not in a horizontal state, the pull ring (33) drives the pressing ring (34) to move, which will interfere with the annular pressing block to reset it, thereby calibrating the center of the circle between the two steel pipes to avoid the height difference between the two steel pipes during installation, which affects the flow of the medium; S5. After the adjustment is completed, the height difference generated during the calibration process is supplemented by filling or other methods; S6, pushing the pull ring (33) to reset the pressing ring (34) indirectly connected to the pull ring (33), so that a certain height difference can exist between the two steel pipes in the later process, thereby avoiding land subsidence, and then rotating the threaded pressing block (22) so that the locking block (24) is locked in the limiting groove (25), thereby avoiding the situation where the thread is loosened during the later medium circulation process, which affects the stability of the pipeline connection.

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