Method and device for precise positioning of a ring around shafting

Abstract

The present application relates to a kind of method and device of accurate positioning of around shafting, first determine the tangent straight line segment of a cross section circle of shafting, pass through leveler adjustment the tangent straight line segment horizontal or vertical to ensure that the vertical line in it passes through the center of circle and vertical or horizontal;Make first positioning point be located on the vertical line of tangent straight line segment, according to the distance of actual required adjustment first positioning point to the surface of shaft;Controller instrument vertical line rotates 90 around the center line of axis in the same axis cross section, determine the degree by leveler, ensure that second positioning point and first positioning point are located in the same axis cross section;In turn complete the determination of third positioning point and / or fourth positioning point of around shafting the same axis cross section.The present application can accurately position measuring instrument, meet the requirement that instrument and axis center line are horizontal or vertical, accurately position the distance of measuring instrument to the surface of shafting, can ensure to accurately position the same axis cross section, compared with traditional manual through visual or with the help of level, positioning work is more convenient, fast.

Description

Technical Field

[0001] This invention belongs to the field of shaft system testing and installation technology, specifically relating to a method and apparatus for precise positioning of a surrounding shaft system. Background Technology

[0002] Shaft systems, as power transmission components, are used in various scenarios. High-precision positioning is crucial for accurate measurement results when testing shaft system parameters. For example, in the following two situations: 1. Measuring radial or axial displacement of the shaft system using displacement sensors: For accurate measurements, the line connecting the displacement sensor and the shaft center must be horizontal or vertical, i.e., directly facing the shaft system. Based on the sensor's effective range, the distance from the sensor to the measurement surface needs strict control to prevent vibrations from exceeding or falling outside the effective range during testing. In some cases, multiple sensors are required to be spaced at a certain angle and positioned on the same shaft cross-section; 2. When using the jacking method for bearing load testing, the jack should be positioned directly below the shaft system, and the line connecting the contact point and the center of the corresponding shaft cross-section should be vertical. Otherwise, the measurement results will be affected.

[0003] There are many similar scenarios that require precise positioning around the axis system. Precise positioning can make the measurement results more accurate. However, in most cases, traditional manual positioning is done by visual inspection or by simply using a level. While ensuring that the equipment is horizontal or vertical, it is impossible to ensure that the line connecting the equipment and the axis is horizontal or vertical, i.e., located on one side or directly above the axis system. This is even more difficult when multiple instruments are located on the same axis cross section.

[0004] Chinese patent CN 204366936 U discloses a shaft-mounted gyroscopic vibration sensor installation and positioning device. This device can only position the sensor directly above the shaft, and cannot set the distance between the sensor and the shaft surface. Furthermore, it is only suitable for positioning directly above the shaft. When it is necessary to install instruments in both horizontal and vertical directions on the same shaft cross-section, and when there are requirements for the distance between the instrument and the shaft surface, the installation accuracy of the above method is clearly insufficient. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the problems of the prior art, such as the inability to ensure that the line connecting the instrument and the shaft is horizontal or vertical during the installation of equipment and instruments around the shaft system, insufficient accuracy when installing multiple sets of instruments on the same shaft cross section, and the inability to set the distance between the instrument and the shaft surface. The present invention provides a method and device for precise positioning around the shaft system, which can more quickly and accurately position the shaft system on the same shaft cross section, thereby making the measurement results more accurate and controlling the distance from the positioning point to the outer surface of the shaft.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A method for precise positioning around a shaft system includes the following steps:

[0008] S1. Use instruments to determine the inscribed straight line segment of a cross-section circle of the shaft system. Use a level to adjust the inscribed straight line segment to be horizontal or vertical to ensure that its perpendicular line passes through the center of the circle and is either vertical or horizontal.

[0009] S2. Position the first positioning point on the perpendicular bisector of the inscribed straight line segment of the circle. Adjust the distance from the first positioning point to the outer surface of the shaft as needed. This position is the most accurate installation position for the instrument. Adjust the position of the instrument bracket and install the instrument on the instrument bracket.

[0010] S3. Rotate the plumb line of the control instrument 90° around the axis within the same cross-section. Determine the degree using a level to ensure that the second positioning point and the first positioning point are located on the same cross-section. Adjust the position of the instrument support and install the instrument on the instrument support.

[0011] S4. Repeat step S3 to determine the third and / or fourth positioning points of the same cross-section around the shaft system.

[0012] This invention also proposes a device for precise positioning of a surrounding shaft system, including an instrument positioning device. The instrument positioning device includes a mounting plate, positioning wheels, a positioning wheel connecting plate, a measuring instrument, an instrument positioning plate, an instrument adapter plate, and a level. The positioning wheel connecting plate is arranged parallel to the instrument positioning plate below the mounting plate. The positioning wheels are symmetrically mounted at both ends of the positioning wheel connecting plate, and the two positioning wheels are used to make tangential contact with the shaft surface. The line connecting the two contact points forms an inscribed straight line segment in a circle. The instrument adapter plate is mounted on the instrument positioning plate, and the measuring instrument is mounted on the instrument adapter plate at the position corresponding to the midpoint of the two positioning wheels. The level is mounted above the mounting plate.

[0013] In the above scheme, the instrument positioning device further includes a positioning wheel adjustment device and an instrument adjustment device; the positioning wheel adjustment device is mounted on the mounting plate, and its output end is connected to the positioning wheel connecting plate, for adjusting the distance between the positioning wheel connecting plate and the mounting plate; the instrument adjustment device is mounted on the mounting plate, and its output end is connected to the instrument positioning plate, for adjusting the distance between the instrument positioning plate and the mounting plate, thereby adjusting the distance from the measuring instrument to the shaft surface.

[0014] In the above scheme, the positioning wheel adjustment device includes a positioning wheel telescopic shaft passing through the mounting plate. The lower end of the positioning wheel telescopic shaft is fixedly connected to the positioning wheel connecting plate. The positioning wheel telescopic shaft can move axially to adjust its position and is fixed by a first fixing member that is adapted to it. The instrument adjustment device includes an instrument telescopic shaft passing through the mounting plate. The lower end of the instrument telescopic shaft is fixedly connected to the instrument positioning plate. The instrument telescopic shaft can move axially to adjust its position and is fixed by a second fixing member that is adapted to it.

[0015] In the above scheme, the device for precise positioning of the surrounding axis system also includes a basic frame, which includes two sets of horizontal connecting rods arranged in parallel and a set of vertical connecting rods connecting the two sets of horizontal connecting rods; a connecting slider is fixed below the mounting plate of the instrument positioning device, and the connecting slider has a through hole in the middle for the horizontal connecting rod to pass through. The entire instrument positioning device is mounted on the basic frame through the connecting slider and can move along the horizontal connecting rods.

[0016] In the above scheme, the device for precise positioning of the surrounding axis system further includes a limiting wheel assembly disposed on one side of the instrument positioning device. The limiting wheel assembly includes a limiting wheel connecting plate, a limiting wheel, and a first connecting block. The limiting wheel connecting plate is disposed across two sets of horizontal connecting rods, and the upper and lower ends of the limiting wheel connecting plate are respectively connected to the two sets of horizontal connecting rods through the first connecting block. The side of the limiting wheel connecting plate near the instrument positioning device is arc-shaped, and the limiting wheel is installed at both ends of the arc.

[0017] In the above scheme, the device for precise positioning of the surrounding axis system further includes an auxiliary limiting wheel group symmetrically arranged on the other side of the instrument positioning device. A space for the shaft to pass through is formed between the instrument positioning device, the limiting wheel group, and the auxiliary limiting wheel group. The auxiliary limiting wheel group includes an auxiliary limiting wheel connecting plate, an auxiliary limiting wheel, and a second connecting block. The auxiliary limiting wheel connecting plate is arranged across two sets of horizontal connecting rods. The upper and lower ends of the auxiliary limiting wheel connecting plate are respectively connected to the two sets of horizontal connecting rods through the second connecting block. The side of the auxiliary limiting wheel connecting plate closest to the instrument positioning device is arc-shaped, and the auxiliary limiting wheel is installed at both ends of the arc.

[0018] In the above scheme, the device for precise positioning of the surrounding shaft system also includes a pressure spring washer, a pressure spring, and a connecting rod fixing ring installed sequentially on the outside of the second connecting block; after the auxiliary limiting wheel group is connected, a pressure spring washer, a pressure spring, and a connecting rod fixing ring need to be installed sequentially on the horizontal connecting rod to prevent the basic frame from jamming due to the rough outer surface of the shaft system during the rotation of the shaft system.

[0019] In the above scheme, both the limiting wheel and the auxiliary limiting wheel are wide wheels to ensure that the device does not shift axially during the rotation of the device around the shaft system.

[0020] In the above scheme, the device for precise positioning of the surrounding shaft system also includes a braking mechanism disposed on the outside of the limiting wheel assembly. The braking mechanism includes a support plate, an adjusting rod, and a pad. The support plate is fixed on a vertical connecting rod and has a through hole for the adjusting rod to pass through. The adjusting rod is disposed perpendicular to the support plate and can move along its own axial direction. The pad is disposed at one end of the adjusting rod near the shaft and is used to abut against the shaft surface.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. Precisely position the measuring instrument to ensure that the line connecting the instrument and the axis is horizontal or vertical.

[0023] This invention utilizes the principle that the perpendicular bisector of an inscribed straight line segment of a circle must pass through the center of the circle. By adjusting this inscribed straight line segment to be horizontal or vertical using a level, the measuring instrument can be accurately positioned, meeting the requirement that the line connecting the instrument and the axis is horizontal or vertical.

[0024] 2. Accurately locate the distance between the measuring instrument and the shaft surface.

[0025] The distance between the measuring instrument and the shaft surface is set by adjusting the position of the instrument positioning plate, so that it is within the effective range of the instrument and prevents the instrument from going out of the effective range due to vibration during the test.

[0026] 3. It can ensure precise positioning of the cross-section of the same axis.

[0027] The perpendicular bisector of the inscribed straight line segment is rotated a certain degree around the axis to ensure that the two positioning operations are performed on the same axial cross-section. This invention includes a limiting wheel set and an auxiliary limiting wheel set for fixing the device, allowing the entire device to be installed on the shaft system; and after the first measuring instrument is installed, the entire device can be directly rotated around the axis. Both the limiting wheel set and the auxiliary limiting wheel set are wide wheels to ensure that no axial displacement occurs during the rotation of the device around the shaft system.

[0028] 4. Compared to traditional manual methods that rely on visual inspection or the aid of a level, positioning is more convenient and faster.

[0029] This method allows for a more convenient and faster positioning and installation of the instrument. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the device for precise positioning around the shaft system according to the present invention;

[0032] Figure 2 This is an overall structural diagram of the device for precise positioning around the shaft system of the present invention;

[0033] Figure 3 yes Figure 2 A structural diagram of the instrument positioning device shown in the diagram;

[0034] Figure 4 yes Figure 2 The diagram shows the basic frame, limit wheel assembly, and brake mechanism of the device shown.

[0035] Figure 5 yes Figure 2 The diagram shows the structure of the auxiliary limit wheel assembly of the device.

[0036] Figure 6 This is a schematic diagram of the device for precise positioning of the surrounding shaft system of the present invention, with a measuring instrument mounted above the shaft;

[0037] Figure 7 This is a schematic diagram of the device for precise positioning of the surrounding shaft system of the present invention, with the measuring instrument mounted on the right side of the shaft;

[0038] Figure 8 yes Figure 7 The main view;

[0039] Figure 9 yes Figure 8 A schematic diagram showing the connection between the instrument bracket and the instrument adapter plate.

[0040] In the diagram: 10. Instrument positioning device; 11. Mounting plate; 111. Connecting slider; 12. Positioning wheel; 13. Positioning wheel connecting plate; 14. Positioning wheel adjusting device; 141. Positioning wheel telescopic shaft; 142. First nut; 15. Measuring instrument; 16. Instrument positioning plate; 17. Instrument adjusting device; 171. Instrument telescopic shaft; 172. Second nut; 18. Instrument adapter plate; 19. Level.

[0041] 20. Basic frame; 21. Horizontal connecting rod; 22. Vertical connecting rod;

[0042] 30. Limit wheel assembly; 31. Limit wheel connecting plate; 32. Limit wheel; 33. First connecting block;

[0043] 40. Auxiliary limit wheel assembly; 41. Auxiliary limit wheel connecting plate; 42. Auxiliary limit wheel; 43. Second connecting block;

[0044] 51. Compression spring washer; 52. Compression spring; 53. Connecting rod retaining ring;

[0045] 60. Braking mechanism; 61. Support plate; 62. Adjusting rod; 63. Foot pad;

[0046] 70. Instrument stand; 71. Adapter;

[0047] 200, shaft. Detailed Implementation

[0048] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] To address the challenge of positioning measuring instruments around a shaft system, this invention provides a method for precise positioning around the shaft system, enabling faster and more accurate positioning. The principle is as follows: The shaft system has a circular cross-section. When a straight line segment is inscribed in the circle (a chord), the perpendicular bisector of this line segment must pass through the center of the circle. Mounting the instrument on this perpendicular bisector ensures the instrument is directly opposite the center. When this line segment is horizontal, the instrument is directly above the center, meeting the technical requirements. Similarly, if this line segment is to the right of the center, adjusting it vertically using a level ensures the instrument mounted on this perpendicular bisector is directly opposite the center and located to the right of the shaft system. A fixed distance is maintained between the instrument and the shaft system surface to meet the distance requirements.

[0050] A method for precise positioning around a shaft system includes the following steps:

[0051] S1. Determine the inscribed straight line segment within a cross-sectional circle of the axis system using instruments. Adjust this inscribed straight line segment to be horizontal or vertical using a level to ensure that its perpendicular bisector passes through the center of the circle and is either vertical or horizontal. The perpendicular bisector of the instruments must be clearly marked.

[0052] S2. Position the first positioning point on the perpendicular bisector of the inscribed line segment of the circle. Adjust the distance from the first positioning point to the outer surface of the shaft as needed. This position is the most precise installation position for the instrument. Adjust the position of the instrument bracket and install the instrument on the bracket.

[0053] S3. Rotate the plumb line of the control instrument 90° around the axis within the same cross-section. Determine the degree using a level to ensure that the second positioning point and the first positioning point are located on the same cross-section. Adjust the position of the instrument support and install the instrument on the support.

[0054] S4. Repeat step S3 to determine the third and / or fourth positioning points of the same cross-section around the shaft system.

[0055] Accordingly, the present invention also proposes a device for precise positioning around a shaft system, such as... Figure 1-2 As shown, it includes an instrument positioning device 10, a basic frame 20, a limit wheel group 30, and an auxiliary limit wheel group 40.

[0056] like Figure 3As shown, the instrument positioning device 10 includes a mounting plate 11, positioning wheels 12, a positioning wheel connecting plate 13, a measuring instrument 15 (a displacement sensor in this embodiment), an instrument positioning plate 16, an instrument adapter plate 18, and a level 19. The positioning wheel connecting plate 13 is arranged parallel to the instrument positioning plate 16 below the mounting plate 11. Positioning wheels 12 are symmetrically mounted at both ends of the positioning wheel connecting plate 13. The two positioning wheels 12 are used to make tangential contact with the shaft surface, and the line connecting the two contact points (i.e., the tangent points) forms an inscribed straight line segment in a circle. The instrument adapter plate 18 is mounted on the instrument positioning plate 16, and the measuring instrument 15 is mounted on the instrument adapter plate 18 and corresponds to the position of the midpoint of the two positioning wheels 12 (i.e., the measuring instrument 15 is located on the parallel line of the perpendicular bisector of the line connecting the two tangent points). The level 19 is mounted above the mounting plate 11. During the installation process, it is necessary to ensure that there are no impurities on the contact surface between the level 19 and the instrument positioning plate 16.

[0057] In a further optimization, the instrument positioning device 10 also includes a positioning wheel adjustment device 14 and an instrument adjustment device 17; the positioning wheel adjustment device 14 is mounted on the mounting plate 11, and its output end is connected to the positioning wheel connecting plate 13, for adjusting the distance between the positioning wheel connecting plate 13 and the mounting plate 11; the instrument adjustment device 17 is mounted on the mounting plate 11, and its output end is connected to the instrument positioning plate 16, for adjusting the distance between the instrument positioning plate 16 and the mounting plate 11, thereby adjusting the distance from the measuring instrument 15 to the shaft surface.

[0058] Further optimization includes a positioning wheel adjustment device 14 with a positioning wheel telescopic shaft 141 penetrating through the mounting plate 11. The lower end of the positioning wheel telescopic shaft 141 is fixedly connected to the positioning wheel connecting plate 13. The positioning wheel telescopic shaft 141 can move axially to adjust its position and is fixed by a first fixing member 142 adapted to it. The instrument adjustment device 17 includes an instrument telescopic shaft 171 penetrating through the mounting plate 11. The lower end of the instrument telescopic shaft 171 is fixedly connected to the instrument positioning plate 16. The instrument telescopic shaft 171 can move axially to adjust its position and is fixed by a second fixing member 172 adapted to it.

[0059] Further optimization involves providing a screw hole on the instrument adapter plate 18 for connection with the adapter portion 71 of the instrument bracket 70. During the transfer of the measuring instrument 15 adapter plate from the displacement sensor positioning plate to the instrument bracket 70, the distance between the adapter plate and the shaft surface remains unchanged.

[0060] like Figure 4 As shown, the basic frame 20 includes two sets of horizontal connecting rods 21 arranged in parallel, and a set of vertical connecting rods 22 connecting the two sets of horizontal connecting rods 21; a connecting slider 111 is fixed below the mounting plate 11 of the instrument positioning device 10, and the connecting slider 111 has a through hole in the middle for the horizontal connecting rods 21 to pass through. The instrument positioning device 10 is mounted on the basic frame 20 through the connecting slider 111 and can move along the horizontal connecting rods 21.

[0061] See also Figure 4 The limiting wheel assembly 30 is disposed on one side of the instrument positioning device 10. The limiting wheel assembly 30 includes a limiting wheel connecting plate 31, a limiting wheel 32, and a first connecting block 33. The limiting wheel connecting plate 31 is disposed across two sets of horizontal connecting rods 21. The upper and lower ends of the limiting wheel connecting plate 31 are respectively connected to the two sets of horizontal connecting rods 21 through the first connecting block 33. The side of the limiting wheel connecting plate 31 near the instrument positioning device 10 is arc-shaped, and the limiting wheel 32 is installed at both ends of the arc.

[0062] See Figure 2 , Figure 5 The auxiliary limiting wheel assembly 40 is symmetrically arranged on the other side of the instrument positioning device 10, forming a space between the instrument positioning device 10, the limiting wheel assembly 30, and the auxiliary limiting wheel assembly 40 for the shaft 200 to pass through. The auxiliary limiting wheel assembly 40 includes an auxiliary limiting wheel connecting plate 41, an auxiliary limiting wheel 42, and a second connecting block 43. The auxiliary limiting wheel connecting plate 41 is arranged across two sets of horizontal connecting rods 21, and the upper and lower ends of the auxiliary limiting wheel connecting plate 41 are respectively connected to the two sets of horizontal connecting rods 21 through the second connecting block 43. The side of the auxiliary limiting wheel connecting plate 41 closest to the instrument positioning device 10 is arc-shaped, and the auxiliary limiting wheel 42 is installed at both ends of the arc.

[0063] The limiting wheel set 30 and the auxiliary limiting wheel set 40 are used to fix the entire device, so that the entire device can be installed on the shaft system; and after the first measuring instrument 15 is installed, the entire device is directly rotated around the shaft. In order to ensure that no axial displacement occurs during the rotation of the device around the shaft system, both the limiting wheel set 30 and the auxiliary limiting wheel set 40 are wide wheels.

[0064] See also Figure 5 The device for precise positioning around the shaft system also includes a pressure spring washer 51, a pressure spring 52, and a connecting rod retaining ring 53, which are installed sequentially on the outside of the second connecting block 43. After the auxiliary limiting wheel set 40 is connected, the pressure spring washer 51, the pressure spring 52, and the connecting rod retaining ring 53 are installed sequentially on the horizontal connecting rod 21 to prevent the basic frame 20 from jamming due to the rough outer surface of the shaft system during rotation around the shaft.

[0065] See also Figure 2 The device for precise positioning around the shaft system also includes a brake mechanism 60 located outside the limit wheel assembly 30. The brake mechanism 60 includes a support plate 61, an adjusting rod 62, and a pad 63. The support plate 61 is fixed to the vertical connecting rod 22 and has a through hole for the adjusting rod 62 to pass through. The adjusting rod 62 is set perpendicular to the support plate 61 and can move along its own axial direction. The pad 63 is located at the end of the adjusting rod 62 near the shaft and is used to abut against the shaft surface.

[0066] According to the method of the present invention, the specific method of using the above-mentioned device is as follows:

[0067] Step 1: Assemble the overall frame (including the basic frame 20, the limiting wheel set 30, and the braking mechanism 60). Assemble the instrument positioning device 10, and ensure that the connecting slider 111 under the instrument positioning plate 16 passes through the two horizontal connecting rods 21 above the basic frame 20. Adjust the instrument positioning device 10 to be as close as possible to the limiting wheel set 30. Adjust the height of the positioning wheel 12 using the positioning wheel adjustment device 14, and adjust the height of the instrument positioning plate 16 using the instrument adjustment device 17.

[0068] Step 2: Pass the overall frame and instrument positioning device 10 through the shaft system until the two sets of limit wheels 32 are completely tangent to the outer diameter of the round shaft.

[0069] Step 3: Assemble the auxiliary limit wheel set 40, and install the auxiliary limit wheel set 40, pressure spring washer 51, pressure spring 52, and connecting rod fixing ring 53 in sequence to prevent jamming due to uneven shaft surface during rotation around the shaft, until the two sets of auxiliary limit wheels 42 on the auxiliary limit wheel set 40 are completely tangent to the outer diameter of the round shaft.

[0070] Step 4: Adjust the positioning wheels 12. When the two positioning wheels 12 are tangent to the outer diameter of the circular shaft, the perpendicular bisector of the line connecting the centers of the two wheels must pass through the center of the circular shaft.

[0071] Step 5: Adjust the horizontal angle of the frame using the level 19, ensuring it is horizontal or vertical according to the required installation position of the measuring instrument 15 (in this embodiment, it is horizontal; see [link]). Figure 6 Operate the brake mechanism 60, rotate the adjusting rod 62 so that the pad 63 abuts against the shaft system, and fix the device on the round shaft.

[0072] Step 6: Press down the instrument positioning plate 16 so that the instrument positioning plate 16 is completely tangent to the outer diameter of the circular shaft, and the distance between the lower surface of the instrument positioning plate 16 and the measuring transmitter is the set value.

[0073] Step 7: Adjust the instrument bracket 70 so that the positioning hole on the fixed position of the instrument bracket 70 connects with the positioning hole on the instrument transfer plate. Finally, remove the bolts that originally fixed the instrument transfer plate. At this point, the installation of the measuring instrument 15 above the axis is complete.

[0074] Step 8: After installing one of the measuring instruments 15 in a set, to install the other, simply release the brake mechanism 60, lift the positioning wheel 12 and the instrument positioning plate 16, connect the new measuring instrument 15 to the instrument adapter plate 18, and fix the instrument adapter plate 18 to the instrument positioning plate 16. Rotate the device to a suitable angle (in this embodiment, the right vertical position; see [reference]). Figure 7-9 Repeat steps four through seven above.

[0075] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for precise positioning around a shaft system, characterized in that, Includes the following steps: S1. Use instruments to determine the inscribed straight line segment of a cross-section circle of the shaft system. Use a level to adjust the inscribed straight line segment to be horizontal or vertical to ensure that its perpendicular line passes through the center of the circle and is either vertical or horizontal. S2. Position the first positioning point on the perpendicular bisector of the inscribed straight line segment of the circle. Adjust the distance from the first positioning point to the outer surface of the shaft as needed. This position is the most accurate installation position for the instrument. Adjust the position of the instrument bracket and install the instrument on the instrument bracket. S3. Rotate the plumb line of the control instrument 90° around the axis within the same cross-section. Determine the degree using a level to ensure that the second positioning point and the first positioning point are located on the same cross-section. Adjust the position of the instrument support and install the instrument on the instrument support. S4. Repeat step S3 to determine the third and / or fourth positioning points of the same cross-section around the shaft system.

2. A device for precise positioning around a shaft system, characterized in that, To implement the method of claim 1, the device includes an instrument positioning device, which includes a mounting plate, positioning wheels, a positioning wheel connecting plate, a measuring instrument, an instrument positioning plate, an instrument adapter plate, and a level. The positioning wheel connecting plate is arranged parallel to the instrument positioning plate below the mounting plate. The positioning wheels are symmetrically mounted at both ends of the positioning wheel connecting plate, and the two positioning wheels are used to make tangential contact with the shaft surface. The line connecting the two contact points forms an inscribed straight line segment in a circle. The instrument adapter plate is mounted on the instrument positioning plate, and the measuring instrument is mounted on the instrument adapter plate at the position corresponding to the midpoint of the two positioning wheels. The level is mounted above the mounting plate.

3. The device for precise positioning around a shaft system according to claim 2, characterized in that, The instrument positioning device further includes a positioning wheel adjustment device and an instrument adjustment device; the positioning wheel adjustment device is mounted on the mounting plate, and its output end is connected to the positioning wheel connecting plate, for adjusting the distance between the positioning wheel connecting plate and the mounting plate; the instrument adjustment device is mounted on the mounting plate, and its output end is connected to the instrument positioning plate, for adjusting the distance between the instrument positioning plate and the mounting plate, thereby adjusting the distance from the measuring instrument to the shaft surface.

4. The device for precise positioning of a surrounding shaft system according to claim 3, characterized in that, The positioning wheel adjustment device includes a positioning wheel telescopic shaft passing through the mounting plate. The lower end of the positioning wheel telescopic shaft is fixedly connected to the positioning wheel connecting plate. The positioning wheel telescopic shaft can move axially to adjust its position and is fixed by a first fixing member adapted to it. The instrument adjustment device includes an instrument telescopic shaft passing through the mounting plate. The lower end of the instrument telescopic shaft is fixedly connected to the instrument positioning plate. The instrument telescopic shaft can move axially to adjust its position and is fixed by a second fixing member adapted to it.

5. The device for precise positioning of a surrounding shaft system according to claim 2, characterized in that, The device for precise positioning around the axis also includes a basic frame, which includes two sets of horizontal connecting rods arranged in parallel and a set of vertical connecting rods connecting the two sets of horizontal connecting rods; a connecting slider is fixed below the mounting plate of the instrument positioning device, and the connecting slider has a through hole in the middle for the horizontal connecting rods to pass through. The entire instrument positioning device is mounted on the basic frame through the connecting slider and can move along the horizontal connecting rods.

6. The device for precise positioning of a surrounding shaft system according to claim 5, characterized in that, The device for precise positioning of the surrounding axis system also includes a limiting wheel assembly disposed on one side of the instrument positioning device. The limiting wheel assembly includes a limiting wheel connecting plate, a limiting wheel, and a first connecting block. The limiting wheel connecting plate is disposed across two sets of horizontal connecting rods, and the upper and lower ends of the limiting wheel connecting plate are respectively connected to the two sets of horizontal connecting rods through the first connecting block. The side of the limiting wheel connecting plate near the instrument positioning device is arc-shaped, and the limiting wheel is installed at both ends of the arc.

7. The device for precise positioning of a surrounding shaft system according to claim 6, characterized in that, The device for precise positioning of the surrounding axis system also includes an auxiliary limiting wheel group symmetrically arranged on the other side of the instrument positioning device. A space for the shaft to pass through is formed between the instrument positioning device, the limiting wheel group, and the auxiliary limiting wheel group. The auxiliary limiting wheel group includes an auxiliary limiting wheel connecting plate, an auxiliary limiting wheel, and a second connecting block. The auxiliary limiting wheel connecting plate is arranged across two sets of horizontal connecting rods. The upper and lower ends of the auxiliary limiting wheel connecting plate are respectively connected to the two sets of horizontal connecting rods through the second connecting block. The side of the auxiliary limiting wheel connecting plate closest to the instrument positioning device is arc-shaped, and the auxiliary limiting wheel is installed at both ends of the arc.

8. The device for precise positioning around a shaft system according to claim 7, characterized in that, The device for precise positioning of the surrounding shaft system also includes a pressure spring washer, a pressure spring, and a connecting rod fixing ring installed sequentially on the outside of the second connecting block; after the auxiliary limiting wheel group is connected, a pressure spring washer, a pressure spring, and a connecting rod fixing ring need to be installed sequentially on the horizontal connecting rod to prevent the basic frame from jamming due to the rough outer surface of the shaft system during the rotation of the shaft system.

9. The device for precise positioning of a surrounding shaft system according to claim 7, characterized in that, Both the limiting wheel and the auxiliary limiting wheel are wide wheels, ensuring that the device does not deviate axially during rotation around the shaft system.

10. The device for precise positioning around a shaft system according to claim 6, characterized in that, The device for precise positioning of the surrounding shaft system also includes a braking mechanism disposed on the outside of the limiting wheel assembly. The braking mechanism includes a support plate, an adjusting rod, and a pad. The support plate is fixed on a vertical connecting rod and has a through hole for the adjusting rod to pass through. The adjusting rod is disposed perpendicular to the support plate and can move along its own axial direction. The pad is disposed at the end of the adjusting rod near the shaft and is used to abut against the shaft surface.

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