Pipe center positioning device and method

Abstract

The invention provides a pipe center positioning device and method, and mainly relates to the technical field of pipe center positioning, the pipe center positioning device comprises a first positioning assembly, a laser emitting assembly and an auxiliary positioning assembly, the first positioning assembly comprises a center positioning plate, and the auxiliary positioning assembly comprises an auxiliary positioning plate; the positioning edge of the center positioning plate and the auxiliary edge of the auxiliary positioning plate serve as two chords of a circle formed by the pipe, the intersection point of the perpendicular bisectors of the center positioning plate and the auxiliary positioning plate is the center of the pipe, namely, the laser emitted by the laser emitting assembly is the axis of the pipe, the pipe center positioning device is used for positioning the center of the pipe, the principle is simple, and the positioning accuracy is high. The sleeve center positioning device is simple in structure, accurate in positioning, convenient to install and use, adjustable, capable of being suitable for pipes with different pipe diameters and capable of improving sleeve center positioning accuracy in actual use, and therefore the coaxiality deviation between an upper sleeve and a lower sleeve is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipe center positioning, and in particular relates to a pipe center positioning device and method. Background Art

[0002] In the construction of water system (water supply, drainage, fire protection, etc.) pipelines in multi-story and high-rise buildings, reserved casing is a key pre-buried measure to ensure waterproofing, anti-settling, sound insulation and easy maintenance when the pipeline passes through walls and floor slabs.

[0003] At present, at the construction site, the casing is mainly fixed by measuring its position relative to the axis. Although this method can ensure that the position of the casing in the plane has no deviation, when there are more floors, there will be inevitable errors in the axis or positioning points of each floor, and there will also be cumulative errors. Especially in high-rise buildings, when the errors gradually accumulate and increase, the deviation of the casing will be affected more, resulting in the need to expand the hole during subsequent pipe installation. When installing rainwater pipes, water stop joints will be installed on each floor. When the deviation of the water stop joints is large, it will cause subsequent rainwater pipes to be installed crookedly, leak, and other installation and use quality problems, resulting in rework and repairs, affecting construction progress and increasing construction costs. Summary of the Invention

[0004] In order to make the center positioning of the pipe more accurate and reduce the deviation of the installation of the upper and lower pipes, the present invention provides a pipe center positioning device and method.

[0005] The technical solutions of the present invention are as follows:

[0006] A pipe center positioning device, comprising:

[0007] a first positioning assembly, the first positioning assembly comprising a center positioning plate, the surface of the center positioning plate being located on a radial plane of the tube, the center positioning plate having a positioning edge, and end points of the positioning edge being adapted to fit against the cylindrical inner wall of the tube;

[0008] a laser emitting assembly, the laser emitting assembly being located on a perpendicular bisector of the positioning edge and configured to emit a laser that coincides with the axis of the tube, the laser emitting assembly being movably connected to the first positioning assembly to adjust the distance from the center positioning plate;

[0009] An auxiliary positioning assembly includes a center positioning auxiliary plate having an auxiliary edge, the end points of the auxiliary edge being used to fit the inner wall of the tube and being staggered from the end points of the positioning edge, the center positioning auxiliary plate being movably connected to the laser emitting assembly to adjust the distance from the laser emitting assembly, and the laser emitting assembly being located on the perpendicular bisector of the auxiliary edge.

[0010] Furthermore, the laser emitting assembly includes a laser emitter support and a laser emitter, the laser emitter is placed on the laser emitter support, and at least the bottom of the laser emitter support is made of transparent material and is marked with a center.

[0011] Furthermore, the first positioning assembly further comprises a first rigid screw, a first threaded sleeve, a level adjuster and a first locking nut;

[0012] The first threaded sleeve is fixed on the surface of the center positioning plate;

[0013] The first rigid screw is rotatably connected to the laser emitting assembly via a bearing;

[0014] The first threaded sleeve and the first locking nut are both sleeved on the surface of the first rigid screw and threadedly connected to the surface of the first rigid screw. The first locking nut is arranged between the first threaded sleeve and the laser emitting assembly and is used to lock the first threaded sleeve;

[0015] Two level adjusters are provided, and the two level adjusters are fixed perpendicularly to each other on the surface of the central positioning plate.

[0016] Furthermore, the auxiliary positioning assembly further includes a telescopic joint;

[0017] One end of the telescopic joint is fixed on the central positioning auxiliary plate, and the other end is rotatably connected to the laser emitting assembly through a connecting assembly.

[0018] Furthermore, the connecting assembly includes a telescopic joint bearing and a telescopic joint rotating shaft, the telescopic joint bearing is fixed on the laser emitting assembly, the telescopic joint rotating shaft is rotatably connected to it in the telescopic joint bearing, and the end of the telescopic joint away from the center positioning auxiliary plate is fixedly connected to the surface of the telescopic joint rotating shaft, so that the center positioning auxiliary plate can swing up and down in a radial plane direction perpendicular to the pipe.

[0019] Furthermore, the device also includes a second positioning component, and the first positioning component and the second positioning component are respectively arranged on both sides of the laser emitting component, and the center line of the second positioning component is collinear with the center line of the first rigid screw rod, which is used to assist in fixing the first positioning component.

[0020] Furthermore, the second positioning assembly includes a second rigid screw, a second threaded sleeve and a second locking nut;

[0021] The second rigid screw is rotatably connected to the laser emitting assembly via a bearing;

[0022] The second threaded sleeve and the second locking nut are both sleeved on the surface of the second rigid screw rod and threadedly connected to the second rigid screw rod. The second locking nut is arranged between the second threaded sleeve and the laser emitting assembly and is used to lock the second threaded sleeve. One end of the second threaded sleeve is used to abut against the inner wall of the pipe to assist in fixing the first positioning assembly.

[0023] The present invention also discloses a pipe center positioning method using the pipe center positioning device, comprising the following steps:

[0024] S1. Place the device inside the pipe so that the two end points of the positioning edge of the center positioning plate are in contact with the inner wall of the pipe, and the surface of the center positioning plate is located on the radial plane of the pipe;

[0025] S2. Fixing the first positioning component;

[0026] S3. Adjust the position of the center positioning auxiliary plate so that the two end points of the auxiliary side of the center positioning auxiliary plate are in contact with the inner wall of the pipe and staggered with the two end points of the positioning side;

[0027] S4. When the laser emitting assembly is located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge at the same time, the center positioning work is completed.

[0028] Furthermore, in step S1, adjusting the surface of the center positioning plate to be located on the radial plane of the pipe is specifically performed by: adjusting the surface of the center positioning plate to be located on the radial plane of the pipe by observing two level adjustment instruments; and / or,

[0029] In step S2, the first positioning assembly is fixed by rotating the second threaded sleeve so that its tip abuts against the inner wall of the pipe; and / or,

[0030] In step S3, the position of the center positioning auxiliary plate is adjusted, specifically:

[0031] Rotate the first rigid screw and the second rigid screw to adjust the position of the laser emitting assembly in the direction of the center line of the first positioning assembly, that is, adjust the position of the center positioning auxiliary plate in this direction, and adjust the distance between the center positioning auxiliary plate and the inner wall of the pipe by adjusting the distance between the center positioning auxiliary plate and the laser emitting assembly; and / or,

[0032] Step S3 also includes: when the laser emitting assembly is simultaneously located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge, observing again the two level adjusters to adjust the surface of the center positioning plate to be located on the radial plane of the pipe.

[0033] Furthermore, step S3 further includes: after the position of the center positioning auxiliary plate is adjusted, rotating the first locking nut and the second locking nut to respectively lock the first threaded sleeve and the second threaded sleeve; and / or,

[0034] Step S4 also includes: when the laser emitting assembly is simultaneously located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge, calibrating the verticality of the laser emitting assembly so that it can emit laser light that coincides with the axis of the pipe.

[0035] The beneficial effects of the present invention are as follows:

[0036] The present invention provides a device and method for locating the center of a pipe. The device and method utilize the characteristic that the intersection of the perpendicular bisectors of any two chords in a circle is the center of the circle, with the positioning edge and the auxiliary edge as the two "chords" and the ray emitted by the laser emitter as the "center of the circle". By adjusting the positions of the positioning edge and the auxiliary edge, the laser emitted by the laser emitter can just coincide with the center line of the pipe, thereby achieving the purpose of locating the center of the pipe. The device has a simple principle and accurate positioning, and can reduce the installation deviation between the upper and lower pipes. The device is easy to install and use, flexible to operate, and adjustable, and can be applied to pipes of different diameters. The size of the device can be adjusted according to the diameter of the pipe.

[0037] By using this device in the installation of building casings, the center position of the upper building casing is determined by the laser emitted by the laser transmitter, which can improve the accuracy of casing center positioning, thereby reducing the coaxiality deviation between the upper and lower layers of casings, avoiding subsequent quality problems such as skewed pipeline installation and leakage, ensuring construction progress, and avoiding increased construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of a pipe center positioning device according to an embodiment of the present invention after completing positioning work;

[0039] Figure 2 This is an embodiment of the present invention Figure 1 A partial enlarged view of point A in the middle;

[0040] Figure 3 is a structural diagram of a connection component in an embodiment of the present invention;

[0041] Figure 4 Schematic diagram of the partial structure of the first limiting component in an embodiment of the present invention.

[0042] In the figure: 1. Pipe; 2. Center positioning plate; 3. Center positioning auxiliary plate; 4. Laser emitter support; 5. Laser emitter; 6. First rigid screw; 7. First threaded sleeve; 8. Level adjuster; 9. First locking nut; 10. Telescopic joint; 11. Connecting assembly; 111. Telescopic joint bearing; 112. Telescopic joint shaft; 12. Second rigid screw; 13. Second threaded sleeve; 14. Second locking nut. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0044] Definition of terms:

[0045] The radial plane refers to a plane along the radial direction of the pipe and perpendicular to the axial center line (axis) of the pipe 1.

[0046] Example 1

[0047] refer to Figures 1 to 4 , this embodiment provides a pipe center positioning device, including: a first positioning component, a laser emitting component and an auxiliary positioning component.

[0048] The first positioning assembly includes a centering plate 2. The surface of the centering plate 2 is located on a radial plane of the tube 1. The centering plate 2 has a positioning edge, the end points of which are configured to engage with the cylindrical inner wall of the tube 1. In this embodiment, the tube 1 is a hollow circular tube, and the centering plate 2 can be in the shape of an isosceles triangle, wherein the base of the isosceles triangle serves as the positioning edge.

[0049] The laser emitting assembly is located on the perpendicular bisector of the positioning edge and is used to emit a laser that coincides with the axis of the pipe 1. The laser emitting assembly is movably connected to the first positioning assembly to adjust the distance from the center positioning plate 2.

[0050] The auxiliary positioning assembly includes a centering auxiliary plate 3 having auxiliary edges. The two end points of the auxiliary edges are designed to mate with the inner wall of the tube 1 and are offset from the two end points of the positioning edge. The centering auxiliary plate 3 is movably connected to the laser emitting assembly to adjust the distance therefrom. The laser emitting assembly is located on the perpendicular bisector of the auxiliary edges. In this embodiment, the centering auxiliary plate 3 can be in the shape of an isosceles triangle, where the base of the isosceles triangle serves as the auxiliary edge.

[0051] The embodiment of the present invention utilizes the characteristic that the intersection of the perpendicular bisectors of any two chords in a circle is the center of the circle, takes the positioning edge and the auxiliary edge as the "chords", and takes the ray emitted by the laser emitter 5 as the "center of the circle". By adjusting the positions of the positioning edge and the auxiliary edge, the two end points of the positioning edge and the two end points of the auxiliary edge are staggered and attached to the inner wall of the pipe 1, so that the laser emitted by the laser emitter 5 can just coincide with the center line of the pipe 1, thereby achieving the purpose of center positioning of the pipe 1. The principle is simple, the positioning is accurate, and the installation and use are easy; the operation is flexible and convenient, and it has adjustability, can be applied to pipes 1 of different diameters, and the overall size of the device can be adjusted according to the diameter of the pipe 1.

[0052] By utilizing the device of this embodiment in the installation of building casings, the center position of the upper building casing is determined by the laser emitted by the laser emitter 5, which can improve the accuracy of the casing center positioning, thereby reducing the coaxiality deviation between the upper and lower casings, avoiding subsequent quality problems such as skewness and leakage in pipeline installation, ensuring the construction progress, and avoiding increasing construction costs.

[0053] As a preferred embodiment, the laser emitting assembly includes a laser emitter support 4 and a laser emitter 5. The laser emitter 5 is placed on the laser emitter support 4 and can be removed from the laser emitter support 4. At least the bottom of the laser emitter support 4 is made of a transparent material and is marked with a center. The laser line emitted by the laser emitter 5 is on the center line of the marked center, so that after the positioning of the lower layer pipe 1 is completed, the position of the upper layer pipe 1 is determined. For example, after the center positioning of the lower layer pipe 1 is completed, the laser line emitted by the laser emitter 5 in the center positioning device is the axis line of the pipe 1. At this time, another pipe 1 that has been centered using a center positioning device without a laser emitter 5 is placed on the superstructure formwork, and a level is used to keep the upper and lower layers of pipes 1 vertical. Then, the beam of the lower layer laser emitter 5 is passed through the center position of the bottom of the laser emitter support 4 in the upper layer center positioning device. This can ensure that the axis lines of the upper layer pipe 1 and the lower layer pipe 1 are coaxial, avoid coaxiality deviation between the upper and lower pipes 1, and improve accuracy.

[0054] As a preferred embodiment, the first positioning assembly further includes a first rigid screw 6 , a first threaded sleeve 7 , a level adjuster 8 and a first locking nut 9 .

[0055] The first threaded sleeve 7 is fixed on the surface of the center positioning plate 2, for example, the first threaded sleeve 7 is fixed on the surface of the center positioning plate 2 by welding or fasteners. In this embodiment, the axis of the first threaded sleeve 7 coincides with the perpendicular bisector of the positioning edge.

[0056] The first rigid screw 6 is rotatably connected to the laser emitting assembly via a bearing, ensuring that the first rigid screw 6 rotates independently of the laser emitting assembly when rotating, or when adjusting the verticality of the laser emitting assembly. The axis of the first rigid screw 6 coincides with the perpendicular bisector of the positioning edge and passes through the centerline of the laser emitting assembly support 4.

[0057] The first threaded sleeve 7 and the first locking nut 9 are both sleeved on the surface of the first rigid screw rod 6 and are threadedly connected to the surface of the first rigid screw rod 6. The first locking nut 9 is arranged between the first threaded sleeve 7 and the laser emitting assembly and is used to lock the first threaded sleeve 7 to prevent the first threaded sleeve 7 from loosening due to external force after the center positioning work is completed, so that the first rigid screw rod 6 and the first threaded sleeve 7 remain fixed in position.

[0058] There are two level adjusters 8, and the two level adjusters 8 are fixed perpendicularly to each other on the surface of the center positioning plate 2, which are used to adjust the levelness of the center positioning plate 2, that is, to adjust the levelness of the entire device to avoid the center positioning plate 2 from tilting and affecting the overall accuracy of the pipe center positioning device.

[0059] As a preferred embodiment, the auxiliary positioning assembly further includes an expansion joint 10. One end of the expansion joint 10 is fixed to the center positioning auxiliary plate 3, and the other end is rotatably connected to the laser emitting assembly via a connecting assembly 11. The expansion joint 10 can be used to adjust the distance between the center positioning auxiliary plate 3 and the laser emitting assembly, making the device suitable for pipes 1 of different diameters. In this embodiment, the axis of the expansion joint 10 coincides with the perpendicular bisector of the auxiliary side.

[0060] The connecting assembly 11 includes a telescopic joint bearing 111 and a telescopic joint shaft 112. The telescopic joint bearing 111 is fixed to the laser emitting assembly, and the telescopic joint shaft 112 is rotatably connected to it within the telescopic joint bearing 111. The end of the telescopic joint 10 away from the center positioning auxiliary plate 3 is fixedly connected to the surface of the telescopic joint shaft 112, allowing the center positioning auxiliary plate 3 to swing up and down in a radial plane direction perpendicular to the pipe 1. Through the connecting assembly 11, the telescopic joint 10 does not affect each other when swinging or adjusting the verticality of the laser emitting assembly to emit laser light. In this embodiment, the telescopic joint bearing 111 has a middle opening structure, so that the telescopic joint shaft 112 fits with the telescopic joint 10 at the opening, allowing the telescopic joint 10 to swing up and down.

[0061] As a preferred embodiment, the device also includes a second positioning component. The first positioning component and the second positioning component are respectively arranged on both sides of the laser emitting component, and the center line of the second positioning component is collinear with the center line of the first rigid screw rod 6, which is used to assist in fixing the first positioning component. After the positioning edge position of the center positioning plate 2 is determined, the device can be fixed in the pipe 1 by the second positioning component. There is no need to use external force to assist in fixing the center positioning plate 2, and it can avoid the center positioning plate 2 from being skewed after leveling, thereby improving the positioning accuracy.

[0062] The second positioning assembly includes a second rigid screw rod 12, a second threaded sleeve 13 and a second locking nut 14. The second rigid screw rod 12 is rotatably connected to the laser emitting assembly through a bearing, so that when the second rigid screw rod 12 rotates or when the verticality of the laser emitting assembly emitting the laser is adjusted, the two do not affect each other.

[0063] The second threaded sleeve 13 and the second locking nut 14 are both sleeved on the surface of the second rigid screw rod 12 and are threadedly connected to the second rigid screw rod 12. The second locking nut 14 is arranged between the second threaded sleeve 13 and the laser emitting assembly and is used to lock the second threaded sleeve 13 to prevent the second threaded sleeve 13 from loosening due to external forces after the center positioning work is completed, so that the second threaded sleeve 13 and the second rigid screw rod 12 remain in a fixed position, improving the positioning accuracy. One end of the second threaded sleeve 13 is used to abut against the inner wall of the pipe 1 to assist in fixing the first positioning assembly. In this embodiment, the first rigid screw rod 6, the first threaded sleeve 7, the second rigid screw rod 12, and the second threaded sleeve 13 are all coaxially arranged.

[0064] Example 2

[0065] This embodiment provides a method for locating the center of a pipe using the pipe center locating device in Example 1, including the following steps: S1-S4. Specifically:

[0066] S1. Place the device inside the pipe 1 so that the two end points of the positioning edge of the center positioning plate 2 fit the inner wall of the pipe 1 and the surface of the center positioning plate 2 is located on the radial plane of the pipe 1.

[0067] As a preferred embodiment, in step S1 , the surface of the center positioning plate 2 is adjusted to be located on the radial plane of the pipe 1 , specifically by observing two level adjusters 8 to adjust the surface of the center positioning plate 2 to be located on the radial plane of the pipe 1 .

[0068] S2. Fixing the first positioning assembly. Specifically, the second threaded sleeve 13 may be rotated so that its tip abuts against the inner wall of the pipe 1 .

[0069] S3. Adjust the position of the center positioning auxiliary plate 3 so that the two end points of the auxiliary side of the center positioning auxiliary plate 3 fit the inner wall of the pipe 1 and are staggered with the two end points of the positioning side.

[0070] As a preferred embodiment, step S3 further includes, when the laser emitting assembly is simultaneously located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge, again observing the two leveling instruments 8 to adjust the surface of the centering plate 2 so that it is located on the radial plane of the tube 1. If the surface of the centering plate 2 is not located on the radial plane of the tube 1, the centering plate 2 is fine-tuned until the laser emitting assembly in the tube centering device is simultaneously located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge, and the surface of the centering plate 2 is located on the radial plane of the tube 1. At this point, the laser emitting assembly completes the centering operation.

[0071] As a preferred embodiment, step S3 also includes: after the position of the center positioning auxiliary plate 3 is adjusted, the first locking nut 9 and the second locking nut 14 are rotated to lock the first threaded sleeve 7 and the second threaded sleeve 13 respectively, so that the first threaded sleeve 7 and the first rigid screw rod 6 remain in a fixed position, and the second threaded sleeve 13 and the second rigid screw rod 12 remain in a fixed position.

[0072] As a preferred embodiment, in step S3, the position of the center positioning auxiliary plate 3 is adjusted as follows:

[0073] Rotating the first rigid screw 6 and the second rigid screw 12 adjusts the position of the laser emitting assembly in the direction of the centerline of the first positioning assembly, thereby adjusting the position of the centering auxiliary plate 3 in this direction. Adjusting the distance between the centering auxiliary plate 3 and the laser emitting assembly adjusts the distance between the centering auxiliary plate 3 and the inner wall of the tube 1. This adjustment ensures that the end points of the auxiliary edge of the centering auxiliary plate 3 are aligned with the inner wall of the tube 1.

[0074] S4. When the laser emitting assembly is located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge at the same time, the center positioning work is completed.

[0075] As a preferred embodiment, step S4 also includes: when the laser emitting assembly is simultaneously located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge, calibrating the verticality of the laser emitting assembly so that it can emit a laser that coincides with the axis of the tube 1.

[0076] In one embodiment, the device is used to install building casing. After completing the positioning work of steps S1-S4, the casing is placed on the building formwork, and the casing is aligned vertically using a level ruler. The casing is then fixed, and the laser emitted by the laser emitter 5 is aligned vertically using a level ruler. A hole is opened below the upper template marked by the laser emitter 5, allowing the laser to pass through the upper template. Then, another casing is placed, which has previously been installed with a pipe centering device (the laser emitter 5 has been removed from the centering device), ensuring that the laser passes through the center of the bottom mark of the laser emitter support 4. At this point, the upper and lower casings are coaxial. The upper casing is then fixed, completing the positioning of the upper casing. The centering device in the lower casing can then be removed. The above steps are repeated to perform casing positioning work on multi-story buildings. When there are many floors, positioning should be carried out floor by floor, using the first-floor casing as a reference to avoid cumulative errors.

[0077] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A pipe center positioning device, characterized in that: include: A first positioning assembly, comprising a center positioning plate (2), the surface of the center positioning plate (2) being located on a radial plane of the tube (1), the center positioning plate (2) having a positioning edge, the two end points of the positioning edge being adapted to fit against the cylindrical inner wall of the tube (1); a laser emitting assembly, the laser emitting assembly being located on a perpendicular bisector of the positioning edge and being used to emit a laser that coincides with the axis of the tube (1), the laser emitting assembly being movably connected to the first positioning assembly to adjust the distance from the center positioning plate (2); An auxiliary positioning component, the auxiliary positioning component includes a center positioning auxiliary plate (3), the center positioning auxiliary plate (3) has an auxiliary edge, the two end points of the auxiliary edge are used to fit with the inner wall of the tube (1), and are staggered with the two end points of the positioning edge, the center positioning auxiliary plate (3) is movably connected to the laser emitting component to adjust the distance from the laser emitting component, and the laser emitting component is located on the perpendicular bisector of the auxiliary edge.

2. The pipe center positioning device according to claim 1, characterized in that: The laser emitting assembly comprises a laser emitter support (4) and a laser emitter (5), wherein the laser emitter (5) is placed on the laser emitter support (4), and at least the bottom of the laser emitter support (4) is made of a transparent material and is marked with a center.

3. The pipe center positioning device according to claim 1, characterized in that: The first positioning assembly further comprises a first rigid screw (6), a first threaded sleeve (7), a level adjuster (8) and a first locking nut (9); The first threaded sleeve (7) is fixed on the surface of the center positioning plate (2); The first rigid screw rod (6) is rotatably connected to the laser emission assembly via a bearing; The first threaded sleeve (7) and the first locking nut (9) are both sleeved on the surface of the first rigid screw rod (6) and are threadedly connected to the surface of the first rigid screw rod (6); the first locking nut (9) is arranged between the first threaded sleeve (7) and the laser emitting assembly and is used to lock the first threaded sleeve (7); Two level adjusters (8) are provided, and the two level adjusters (8) are fixed perpendicularly to each other on the surface of the center positioning plate (2).

4. The pipe center positioning device according to claim 1, characterized in that: The auxiliary positioning assembly further includes a telescopic joint (10); One end of the telescopic joint (10) is fixed on the center positioning auxiliary plate (3), and the other end is rotationally connected to the laser emission component via a connecting component (11).

5. The pipe center positioning device according to claim 4, characterized in that: The connecting assembly (11) includes a telescopic joint bearing (111) and a telescopic joint rotating shaft (112), wherein the telescopic joint bearing (111) is fixed on the laser emitting assembly, and the telescopic joint rotating shaft (112) is rotatably connected to the telescopic joint bearing (111) inside the telescopic joint bearing (111), and one end of the telescopic joint (10) away from the center positioning auxiliary plate (3) is fixedly connected to the surface of the telescopic joint rotating shaft (112), so that the center positioning auxiliary plate (3) can swing up and down along a radial plane direction perpendicular to the pipe (1).

6. The pipe center positioning device according to claim 3, characterized in that: The device also includes a second positioning component, wherein the first positioning component and the second positioning component are respectively arranged on both sides of the laser emitting component, and the center line of the second positioning component is colinear with the center line of the first rigid screw rod (6) for assisting in fixing the first positioning component.

7. The pipe center positioning device according to claim 6, characterized in that: The second positioning assembly comprises a second rigid screw rod (12), a second threaded sleeve (13) and a second locking nut (14); The second rigid screw rod (12) is rotatably connected to the laser emission assembly via a bearing; The second threaded sleeve (13) and the second locking nut (14) are both sleeved on the surface of the second rigid screw rod (12) and are threadedly connected to the second rigid screw rod (12). The second locking nut (14) is arranged between the second threaded sleeve (13) and the laser emitting assembly and is used to lock the second threaded sleeve (13). One end of the second threaded sleeve (13) is used to abut against the inner wall of the pipe (1) to assist in fixing the first positioning assembly.

8. A method for locating the center of a pipe using the pipe center locating device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. The device is placed in the pipe (1), so that the two end points of the positioning edge of the center positioning plate (2) are in contact with the inner wall of the pipe (1), and the surface of the center positioning plate (2) is located on the radial plane of the pipe (1); S2. Fixing the first positioning component; S3, adjusting the position of the center positioning auxiliary plate (3) so that the two end points of the auxiliary edge of the center positioning auxiliary plate (3) fit the inner wall of the pipe (1) and are staggered with the two end points of the positioning edge; S4. When the laser emitting assembly is located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge at the same time, the center positioning work is completed.

9. The method for locating the center of a pipe according to claim 8, wherein: Using the pipe centering device as claimed in claim 7; In the step S1, the surface of the center positioning plate (2) is adjusted to be located on the radial plane of the pipe (1), specifically: by observing two level adjustment instruments (8), the surface of the center positioning plate (2) is adjusted to be located on the radial plane of the pipe (1); and / or, In the step S2, the first positioning assembly is fixed, specifically by rotating the second threaded sleeve (13) so that its tip abuts against the inner wall of the pipe (1); and / or, In step S3, the position of the center positioning auxiliary plate (3) is adjusted, specifically: Rotating the first rigid screw (6) and the second rigid screw (12) to adjust the position of the laser emitting assembly in the direction of the center line of the first positioning assembly, that is, adjusting the position of the center positioning auxiliary plate (3) in this direction, and adjusting the distance between the center positioning auxiliary plate (3) and the inner wall of the pipe (1) by adjusting the distance between the center positioning auxiliary plate (3) and the laser emitting assembly; and / or, Step S3 also includes: when the laser emitting assembly is simultaneously located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge, observing again the two level adjusters (8) to adjust the surface of the center positioning plate (2) to be located on the radial plane of the pipe (1).

10. The method for locating the center of a pipe according to claim 9, wherein: Step S3 further comprises: after the position of the center positioning auxiliary plate (3) is adjusted, rotating the first locking nut (9) and the second locking nut (14) to respectively lock the first threaded sleeve (7) and the second threaded sleeve (13); and / or, Step S4 also includes: when the laser emitting assembly is simultaneously located on the perpendicular bisector of the positioning edge and the perpendicular bisector of the auxiliary edge, calibrating the verticality of the laser emitting assembly so that it can emit laser light that coincides with the axis of the pipe (1).

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