Pipeline centering device

Abstract

The utility model discloses a pipeline centering device which comprises a barrel and two centering mechanisms, and the two centering mechanisms are arranged at the two ends of the barrel respectively. Each centering mechanism comprises at least three pressing claws, at least one movable ring and at least one static ring; the two pipe sections which are separated from each other can be preliminarily positioned in the cylinder body. Each static ring is connected with the end face of the cylinder, each moving ring is connected between the static ring and the cylinder in an abutting mode, each pressing claw is adjacent to the corresponding moving ring, threads are arranged on the end face of each moving ring and the outer surface of each pressing claw respectively, the adjacent moving rings and pressing claws are in transmission connection through the threads, and each moving ring can rotate around the central axis of the cylinder relative to the cylinder. Therefore, the adjacent pressing claws are driven to move relative to the barrel in the radial direction of the barrel, and the three pressing claws abut against the outer wall face of the pipeline in the radial direction of the barrel. The pipeline centering device is convenient to use and operate, only one worker is needed to operate the two movable rings, the number of the workers is reduced, and foreign matter cannot be introduced into a nuclear power station site.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant pipeline welding, in particular to a pipeline centering device. Background Art

[0002] In the modification and maintenance of nuclear power plant pipelines, two sections of pipelines need to be welded together. When welding pipelines, there are high requirements for the concentricity of pipeline welding. There are two traditional methods for pipeline welding alignment: 1. Use spot fixing plates to assist welding. Because the spot fixing plates are small, they are very easy to fall into the pipeline, causing the risk of introducing foreign matter, which does not meet the requirements of nuclear power plants to prevent foreign matter; 2. Two people operate at the same time, one assists in docking the pipeline, and the other performs welding. However, many pipeline welding work in nuclear power plants needs to be carried out in narrow or confined spaces such as pits, making it difficult for operators to carry out their work. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a pipeline centering device for assisting pipeline centering during pipeline welding work in a nuclear power plant.

[0004] The technical solution adopted by the utility model to solve the technical problem is: to provide a pipeline centering device, which includes a cylinder and two centering mechanisms, and the two centering mechanisms are respectively arranged at two ends of the cylinder;

[0005] Each of the centering mechanisms comprises at least three pressure claws, at least one dynamic ring and at least one static ring; the internal space of the cylinder is used to accommodate the pipeline, each static ring is connected to the end face of the cylinder, each dynamic ring abuts between the static ring and the cylinder, each pressure claw is arranged adjacent to the dynamic ring, each pressure claw penetrates the inner and outer sides of the cylinder along the radial direction of the cylinder, the end face of each dynamic ring and the outer surface of each pressure claw are respectively provided with threads, and the adjacent dynamic rings and pressure claws are connected by the threaded transmission;

[0006] Each of the movable rings can rotate relative to the cylinder around the central axis of the cylinder, thereby driving the pressure claws adjacent thereto to move relative to the cylinder along the radial direction of the cylinder.

[0007] Preferably, each of the pressing claws comprises a displacement measuring assembly and a hollow shell, a part of the displacement measuring assembly is arranged inside the shell, and another part of the displacement measuring assembly is arranged outside the shell;

[0008] The displacement measuring assembly can move relative to the shell along the radial direction of the cylinder, and the outer surface of the shell is provided with the thread.

[0009] Preferably, the displacement measuring assembly comprises an abutment member, an elastic member and a displacement sensor;

[0010] The housing is provided with a first through hole penetrating through both inner and outer sides thereof, the abutment member is passed through the first through hole, the elastic member is arranged inside the housing, the displacement sensor is at least partially arranged inside the housing, and the elastic member is connected between the abutment member and the displacement sensor;

[0011] The abutment member can move relative to the housing along a penetration direction of the first through hole.

[0012] Preferably, the displacement sensor includes a sensor body and a cable, the shell is further provided with a second through hole penetrating both inner and outer sides thereof, the second through hole is arranged opposite to the first through hole, the cable is passed through the second through hole, and the sensor body is connected between the cable and the elastic member.

[0013] Preferably, the displacement measurement assembly further comprises a sealing unit disposed at the second through hole, and the sealing unit is connected between the housing and the cable.

[0014] Preferably, the displacement sensor includes a sensor body and a digital display head, the shell is also provided with a second through hole passing through both sides thereof, the second through hole is arranged opposite to the first through hole, the digital display head is located on the outside of the shell and is arranged at the second through hole, and the sensor body is connected between the digital display head and the elastic member.

[0015] Preferably, each end of the cylinder is provided with at least three grooves, each of the grooves passes through the inner and outer sides of the cylinder, the at least three pressure claws and the at least three grooves are matched together one by one, and the groove wall surface of the groove is provided with a lubricating layer.

[0016] Preferably, the cylinder is provided with at least one opening between its two ends, and the opening passes through both inner and outer sides of the cylinder.

[0017] Preferably, the pipeline centering device also includes bolts, and each end face of the stationary ring and each end face of the cylinder are provided with bolt holes, and the bolts are detachably inserted into the bolt holes to detachably connect each stationary ring to the end face of the cylinder.

[0018] Preferably, at each end of the cylinder, the pressing claws are evenly distributed along the circumference of the cylinder.

[0019] The utility model has at least the following beneficial effects: the internal space of the cylinder is used to accommodate the pipeline, and the two separated pipe sections are installed on the same cylinder, so that they can be initially positioned inside the cylinder. The adjacent moving rings and the pressing claws are connected by threaded transmission, that is, the same moving ring can be connected to the three pressing claws by end face threaded transmission, and each moving ring can rotate relative to the cylinder around the central axis of the cylinder, thereby driving the three pressing claws adjacent to it to move relative to the cylinder along the radial direction of the cylinder, so that the three pressing claws press against the outer wall surface of the pipeline along the radial direction of the cylinder. In this way, it can be ensured that each pipe section has good concentricity (coaxiality) with the cylinder, so that the two pipe sections have good concentricity (coaxiality). The pipeline centering device is easy to use and operate, and only one staff member is needed to operate the two moving rings, which reduces the number of staff members and does not introduce foreign matter into the nuclear power plant site. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the pipeline centering device in some embodiments of the utility model;

[0022] Figure 2 yes Figure 1 A side structural schematic diagram of the pipeline centering device shown;

[0023] Figure 3 yes Figure 1 The front view structural schematic diagram of the pipeline centering device shown;

[0024] Figure 4 yes Figure 1 A schematic cross-sectional structure diagram of a pressure claw of a pipeline centering device shown;

[0025] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure of the pressure claw from another perspective;

[0026] Figure 6 is a schematic cross-sectional structure diagram of the pressing claws in other embodiments of the utility model;

[0027] Figure 7 yes Figure 6 A schematic diagram of the cross-sectional structure of the pressure claw from another perspective is shown. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0029] like Figures 1 to 3 As shown, in some embodiments, the pipeline centering device provided by the utility model includes a cylinder 1 and two centering mechanisms, and the cylinder 1 is a hollow cylindrical structure having two ends. The two centering mechanisms are respectively arranged at the two ends of the cylinder 1. Each centering mechanism includes at least three pressure claws 2, at least one dynamic ring 3 and at least one static ring 4. That is, in each centering mechanism, the number of pressure claws 2 is at least three, the number of dynamic rings 3 is at least one, and the number of static rings 4 is at least one. That is, the two centering mechanisms include at least six pressure claws 2, at least two dynamic rings 3 and at least two static rings 4 in total. The two centering mechanisms are symmetrically arranged at the two ends of the cylinder 1. The internal space of the cylinder 1 is used to accommodate the pipeline.

[0030] Each stationary ring 4 is connected to the end face of the cylinder 1, and each dynamic ring 3 is abutted between the stationary ring 4 and the cylinder 1. That is, the stationary ring 4 and the cylinder 1 together fix the axial position of the dynamic ring 3 on the cylinder 1, but the circumferential position of the dynamic ring 3 is changeable, that is, the dynamic ring 3 is rotatable relative to the cylinder 1. Specifically, each pressing claw 2 is arranged adjacent to the dynamic ring 3, and each pressing claw 2 penetrates the inner and outer sides of the cylinder 1 along the radial direction of the cylinder 1. The end face of each dynamic ring 3 and the outer surface of each pressing claw 2 facing the dynamic ring 3 are respectively provided with threads 23, and the adjacent dynamic rings 3 and pressing claws 2 are connected by transmission through the threads 23. Each dynamic ring 3 can rotate relative to the cylinder 1 around the central axis y of the cylinder 1, thereby driving the adjacent pressing claw 2 to move relative to the cylinder 1 along the radial direction of the cylinder 1. That is, the rotation central axis of the dynamic ring 3 is perpendicular to the moving direction of the pressing claw 2, and the dynamic ring 3 and the pressing claw 2 constitute an end face gear transmission system. Therefore, when a person rotates the movable ring 3 , the movable ring 3 can drive the pressure claw 2 to move relative to the cylinder body 1 along the radial direction of the cylinder body 1 through the thread 23 , so that the pressure claw 2 is close to or away from the outer wall surface of the pipe inside the cylinder body 1 .

[0031] by Figures 1 to 3Taking the pipeline centering device of the illustrated embodiment as an example, the process of using the pipeline centering device in pipeline welding work is as follows: first, align the end of the cylinder 1 with one of the two separated pipe sections, then sleeve the cylinder 1 on the outer wall of one of the pipe sections, and one of the centering mechanisms is located on the outer wall of one of the pipe sections. Then, align the other pipe section and extend it into the end of the cylinder 1, so that the cylinder 1 is simultaneously sleeved on the outer wall of the other pipe section, and the other centering mechanism is located on the outer wall of the other pipe section. Thus, the two separated pipe sections are installed on the same cylinder 1 and are initially positioned inside the cylinder 1. Finally, the personnel rotate the two moving rings 3 located at both ends of the cylinder 1, so that each pressing claw 2 is driven by the moving ring 3 and simultaneously approaches the outer wall of the pipe along the radial direction of the cylinder 1, until each pressing claw 2 is firmly abutted against the outer wall of the pipe, completing the centering of the pipeline.

[0032] In summary, the internal space of the cylinder 1 is used to accommodate the pipeline, and the two separated pipe sections are installed on the same cylinder 1, so that the initial positioning can be obtained inside the cylinder 1. The adjacent moving rings 3 and the pressing claws 2 are connected by transmission through the thread 23, that is, the same moving ring 3 can be connected by transmission with the three pressing claws 2 through the end face thread 23, and each moving ring 3 can rotate relative to the cylinder 1 around the central axis y of the cylinder 1, thereby driving the three pressing claws 2 adjacent to it to move relative to the cylinder 1 along the radial direction of the cylinder 1, so that the three pressing claws 2 are pressed against the outer wall surface of the pipeline along the radial direction of the cylinder 1. The three pressing claws 2 have the same displacement, thereby ensuring that the intervals between the three positions on the outer wall surface of the pipeline that contact the three pressing claws 2 are consistent with the inner wall surface of the cylinder 1, so that each pipe section can be ensured to have good concentricity (coaxiality) with the cylinder 1, so that the two pipe sections have good concentricity (coaxiality). The pipeline centering device is easy to use and operate, and only one staff member is required to operate the two moving rings 3, which reduces the number of staff members and does not introduce foreign matter into the nuclear power plant site.

[0033] like Figures 4 to 7 As shown, in some embodiments, each pressure jaw 2 includes a displacement measuring component 21 and a hollow structure shell 20. A portion of the displacement measuring component 21 is disposed inside the shell 20, and another portion of the displacement measuring component 21 is disposed outside the shell 20. The displacement measuring component 21 can move relative to the shell 20 along the radial direction of the cylinder 1. The displacement measuring component 21 can contact the outer wall surface of the pipeline during the movement of the shell 20, and a relative displacement occurs between the shell 20. By detecting the relative displacement between itself and the shell 20, the operator is prompted with information on whether the pressure jaw 2 and the pipeline are locked. A thread 23 is provided on the outer surface of the shell 20. The thread 23 on the moving ring 3 is adapted to the thread 23 on the outer surface of the shell 20.

[0034] like Figures 4 to 7As shown, further, in some embodiments, the displacement measurement assembly 21 includes an abutment member 211, an elastic member 212 and a displacement sensor 213. The housing 20 is provided with a first through hole 201 penetrating through the inner and outer sides thereof, the abutment member 211 is penetrated through the first through hole 201, the elastic member 212 is arranged inside the housing 20, the displacement sensor 213 is at least partially arranged inside the housing 20, and the elastic member 212 is connected between the abutment member 211 and the displacement sensor 213. The abutment member 211 can move relative to the housing 20 along the through direction of the first through hole 201. During the movement of the abutment member 211 relative to the housing 20, the elastic member 212 is compressed accordingly, and the displacement sensor 213 detects the compression amount of the elastic member 212, and quantifies the displacement of the abutment member 211 relative to the housing 20.

[0035] Specifically, in the process of personnel rotating the moving ring 3 to make the pressure claw 2 approach the outer wall of the pipe, there are three stages in chronological order: in the first stage, driven by the moving ring 3, the shell 20 and the displacement measuring assembly 21 move together along the radial direction of the cylinder 1 relative to the cylinder 1 and approach the outer wall of the pipe until the part of the abutment 211 located outside the shell 20 first contacts the outer wall of the pipe; in the second stage, the shell 20 continues to approach the outer wall of the pipe, but the abutment 211 and the pipe are relatively stationary, and the part of the abutment 211 located outside the shell 20 gradually moves relative to the shell 20 and retracts to the inside of the shell 20 until the abutment 211 is completely retracted to the inside of the shell 20; in the third stage, the shell 20 continues to move, and the abutment 211 and the shell 20 remain relatively stationary. The relative displacement between the displacement measuring assembly 21 and the shell 20 measured by the displacement sensor 213 is zero, which means that the shell 20 is completely in close contact with the outer wall of the pipe, and the operator can be prompted with the information that the pressure claw 2 and the pipe are locked.

[0036] like Figure 4 and Figure 5As shown, further, in some embodiments, the displacement sensor 213 includes a sensor body 214 and a cable 215, and the housing 20 is further provided with a second through hole 202 that passes through both sides thereof, and the second through hole 202 is arranged opposite to the first through hole 201. Specifically, along the radial direction of the cylinder 1, the second through hole 202 and the first through hole 201 are respectively arranged at both ends of the housing 20. The cable 215 is passed through the second through hole 202, and the sensor body 214 is connected between the cable 215 and the elastic member 212. Specifically, one end of the cable 215 extends into the interior of the housing 20 through the second through hole 202 and is connected to the sensor body 214. The other end of the cable 215 is located outside the housing 20 and can be used to connect to equipment such as a control terminal. The sensor body 214 detects the compression of the elastic member 212, and transmits the corresponding displacement data to the corresponding control terminal through the cable 215. The control terminal obtains the relative displacement data between the displacement measurement component 21 and the housing 20, and can display the data in real time for personnel, and can remind personnel through sound and light alarms when the relative displacement between the displacement measurement component 21 and the housing 20 is detected to be zero. The displacement sensor is a mature existing technology. The displacement sensor 213 described in this embodiment can adopt an existing displacement sensor with a cable, which will not be repeated here. The control terminal can be an electronic device such as a computer and a mobile phone.

[0037] like Figure 4 As shown, further, in some embodiments, the displacement measurement assembly 21 further includes a sealing unit 216 disposed at the second through hole 202, and the sealing unit 216 is connected between the housing 20 and the cable 215 to seal the gap between the housing 20 and the cable 215 to prevent external impurities from entering the interior of the housing 20 through the gap and affecting the normal operation of the displacement sensor 213 or affecting the measurement accuracy. Specifically, as Figure 4 In the illustrated embodiment, the sealing unit 216 includes an elastic sealing ring 218 and a rigid sealing ring 217. The inner wall surface of the sealing ring 217 is provided with a circle of mounting grooves, and the sealing ring 218 is arranged in the mounting grooves. The inner wall surface of the sealing ring 217 and the sealing ring 218 are respectively in sealing contact with the outer peripheral surface of the cable 215. The outer wall surface of the sealing ring 217 is in sealing contact with the inner wall surface of the shell 20. There may be an interference fit between the sealing ring 217 and the shell 20. In some other embodiments, the sealing unit 216 may also be a sealing ring installed in the gap between the shell 20 and the cable 215; or, the sealing unit 216 may also be an adhesive layer filled in the gap between the shell 20 and the cable 215.

[0038] like Figure 6 and Figure 7 As shown, in some other embodiments, Figure 4 and Figure 5The difference between the illustrated embodiment is that the displacement sensor 213 includes a sensor body 214 and a digital display head 219. The digital display head 219 is located outside the housing 20 and is arranged at the second through hole 202, covering the second through hole 202. The sensor body 214 is connected between the digital display head 219 and the elastic member 212. Thus, the displacement data detected by the sensor body 214 can be directly displayed by the digital display head 219 for personnel to know. The displacement sensor is a mature prior art, and the displacement sensor 213 described in this embodiment can adopt an existing displacement sensor with a digital display, which will not be repeated here. Specifically, in this embodiment, the sensor body 214 includes a movable ruler 2140 and a fixed ruler 2141. One of the movable ruler 2140 and the fixed ruler 2141 is connected to the elastic member 212 and can move up and down relative to the shell 20 with the elastic member 212, and the other of the movable ruler 2140 and the fixed ruler 2141 is relatively stationary with respect to the shell 20. By measuring the relative displacement of the movable ruler 2140 and the fixed ruler 2141, the relative displacement between the abutment member 211 and the shell 20 can be obtained, and the measured displacement data is displayed by the digital display head 219.

[0039] like Figures 1 to 3 As shown, in some embodiments, at least three grooves are provided at each end of the cylinder 1, each groove runs through the inner and outer sides of the cylinder 1, and at least three pressing claws 2 and at least three grooves are matched together in a one-to-one correspondence. That is, the number of grooves is consistent with the number of pressing claws 2, and each groove is used to install a pressing claw 2. The groove wall surface of each groove is provided with a lubricating layer, which is used to reduce the friction between the pressing claw 2 and the groove, thereby ensuring that the pressing claw 2 can move smoothly relative to the cylinder 1.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the cylinder 1 is provided with at least one opening 10 at a position between its two ends, and the opening 10 passes through the inner and outer sides of the cylinder 1. Specifically, the opening 10 is located in the middle position of the central axis y direction of the cylinder 1, and avoids the two ends of the cylinder 1. The opening 10 can be one, two or three. The shape and number of the openings 10 can be freely selected. The opening 10 is mainly used to accommodate welding tools such as welding rods required for the welding process of the two pipe sections. Therefore, when the cylinder 1 is sleeved on the outer wall surface of the two pipe sections, the weld position between the two pipe sections is just exposed through the opening 10, which is convenient for personnel to perform welding work.

[0041] like Figure 1 and Figure 2As shown, in some embodiments, a bolt hole 80 is provided on the end face of each stationary ring 4 and each end face of the cylinder 1. The pipeline centering device further includes a plurality of bolts 81, each of which is detachably inserted into a bolt hole 80 to detachably connect each stationary ring 4 to the end face of the cylinder 1. Of course, in some other embodiments, the stationary ring 4 and the end face of the cylinder 1 may also be non-detachably connected.

[0042] like Figure 1 and Figure 3 As shown, in some embodiments, at each end of the cylinder 1, the pressure claws 2 are evenly spaced and distributed along the circumference of the cylinder 1. For example, Figure 1 and Figure 3 In the illustrated embodiment, there are three pressing claws 2 at each end of the cylinder 1, and the three pressing claws 2 are distributed in a ring shape with an angle of 120° along the circumference of the cylinder 1. This ensures that three positions on the outer wall of the pipeline at equal intervals along the circumference are in contact with the three pressing claws 2 respectively, further accurately ensuring the concentricity (coaxiality) between the pipeline and the cylinder 1.

[0043] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A pipeline centering device, characterized in that: It comprises a cylinder (1) and two centering mechanisms, wherein the two centering mechanisms are respectively arranged at two ends of the cylinder (1); Each of the centering mechanisms comprises at least three pressure claws (2), at least one moving ring (3) and at least one stationary ring (4); the internal space of the cylinder (1) is used to accommodate the pipeline, each stationary ring (4) is connected to the end face of the cylinder (1), each moving ring (3) is abutted between the stationary ring (4) and the cylinder (1), each of the pressure claws (2) is arranged adjacent to the moving ring (3), each of the pressure claws (2) penetrates the inner and outer sides of the cylinder (1) along the radial direction of the cylinder (1), the end face of each moving ring (3) and the outer surface of each pressure claw (2) are respectively provided with threads (23), and the adjacent moving rings (3) and pressure claws (2) are transmission-connected via the threads (23); Each of the movable rings (3) is capable of rotating relative to the cylinder (1) around the central axis (y) of the cylinder (1), thereby driving at least three adjacent pressing claws (2) to move relative to the cylinder (1) along the radial direction of the cylinder (1).

2. The pipeline centering device according to claim 1, characterized in that: Each of the pressing claws (2) comprises a displacement measuring component (21) and a shell (20) with a hollow structure, wherein a portion of the displacement measuring component (21) is arranged inside the shell (20), and another portion of the displacement measuring component (21) is arranged outside the shell (20); The displacement measuring assembly (21) is capable of moving relative to the housing (20) along the radial direction of the cylinder (1), and the outer surface of the housing (20) is provided with the thread (23).

3. The pipeline centering device according to claim 2, characterized in that: The displacement measurement component (21) comprises an abutment member (211), an elastic member (212) and a displacement sensor (213); The housing (20) is provided with a first through hole (201) penetrating the inner and outer sides thereof; the abutment member (211) is arranged through the first through hole (201); the elastic member (212) is arranged inside the housing (20); the displacement sensor (213) is at least partially arranged inside the housing (20); and the elastic member (212) is connected between the abutment member (211) and the displacement sensor (213); The abutment member (211) is capable of moving relative to the housing (20) along a penetration direction of the first through hole (201).

4. The pipeline centering device according to claim 3, characterized in that: The displacement sensor (213) comprises a sensor body (214) and a cable (215); the housing (20) is further provided with a second through hole (202) penetrating both inner and outer sides thereof; the second through hole (202) is arranged opposite to the first through hole (201); the cable (215) is passed through the second through hole (202); and the sensor body (214) is connected between the cable (215) and the elastic member (212).

5. The pipeline centering device according to claim 4, characterized in that: The displacement measurement assembly (21) further comprises a sealing unit (216) disposed at the second through hole (202), wherein the sealing unit (216) is connected between the housing (20) and the cable (215).

6. The pipeline centering device according to claim 3, characterized in that: The displacement sensor (213) comprises a sensor body (214) and a digital display head (219); the housing (20) is further provided with a second through hole (202) penetrating both inner and outer sides thereof; the second through hole (202) is arranged opposite to the first through hole (201); the digital display head (219) is located outside the housing (20) and is arranged at the second through hole (202); the sensor body (214) is connected between the digital display head (219) and the elastic member (212).

7. The pipeline centering device according to claim 1, characterized in that: Each end of the cylinder (1) is provided with at least three grooves, each of the grooves passes through the inner and outer sides of the cylinder (1), the at least three pressing claws (2) and the at least three grooves are matched together in a one-to-one correspondence, and the groove wall surface of the groove is provided with a lubricating layer.

8. The pipeline centering device according to claim 1, characterized in that: The cylinder (1) is provided with at least one opening (10) at a position between its two ends, and the opening (10) passes through both the inner and outer sides of the cylinder (1).

9. The pipeline centering device according to claim 1, characterized in that: The pipeline centering device also includes a bolt (81), and a bolt hole (80) is provided on the end face of each stationary ring (4) and each end face of the cylinder (1). The bolt (81) is detachably inserted into the bolt hole (80) to detachably connect each stationary ring (4) to the end face of the cylinder (1).

10. The pipeline centering device according to claim 1, characterized in that: At each end of the cylinder (1), the pressing claws (2) are evenly distributed along the circumference of the cylinder (1).

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