Precision adjusting method of rotary recoiling machine

Abstract

The invention discloses a precision adjusting method of a rotary coiling machine. The precision adjusting method comprises the following steps: arranging target point units at at least three calibration positions of a coiling block; measuring the coordinates of the target ball by adopting a laser tracker, then rotating the winding drum for at least two times, and measuring the coordinates of the target ball; obtaining a circle center coordinate of the calibration position; based on the circle center coordinates, the coaxiality of the winding drum is obtained; after the coaxiality is adjusted, the rotation device is controlled to rotate, and the circle center coordinates of the calibration position are determined again; and determining a rotation surface of the rotation device based on the circle center coordinates of the calibration position determined for multiple times to obtain the perpendicularity of the winding drum, and carrying out assembly adjustment until the perpendicularity of the winding drum is smaller than a second threshold value. The precision adjusting efficiency of the rotary recoiling machine is improved, and the assembling efficiency, the production efficiency and the assembling precision of the recoiling machine are improved.

Description

Technical Field

[0001] The invention relates to the technical field of rotary coilers, and in particular to a precision adjustment method for rotary coilers. Background Art

[0002] Coilers are specialized equipment used in the metallurgical industry to coil steel plates. According to the number of coils, they are divided into single-drum coilers and double-drum rotary coilers. The double-drum rotary coiler is compact in design, saving equipment installation space and fixed investment. When coiling strip steel, it can quickly establish tension, coil the strip steel in a continuous manner, extend the stable rolling time, and improve the yield rate. It is widely used in various strip steel production lines.

[0003] The double-drum rotary winder is a large-scale high-speed rotary machine with a complex structure, a long transmission shaft, and many transmission stages. It is a metallurgical machine with high design and manufacturing difficulty and high assembly precision requirements. During assembly, it is necessary to adjust the center of the winder to align with the rotating surface of the large drum, and also to adjust the rotating center of the large drum to align with the rotating center of the primary reducer. Finally, when the two winders, large drum, primary reducer and secondary reducer are assembled, the assembly precision of each component must be repeatedly adjusted. In the prior art, it is necessary to use equipment such as a level and steel wire for multiple measurements and adjustments, which consumes a lot of energy and time, and is not conducive to improving the assembly efficiency and production efficiency of the winder. Summary of the invention

[0004] The purpose of the present invention is to provide a precision adjustment method for a rotary winder to solve the technical problem in the prior art that the assembly precision adjustment process of the double-drum rotary winder is complicated, requires a lot of energy and time, and is not conducive to improving the assembly efficiency and production efficiency of the winder.

[0005] In order to solve the above technical problems, the present invention provides a precision adjustment method for a rotary winder, wherein the rotary winder comprises a rotary device and a plurality of winding drums, and the precision adjustment method comprises:

[0006] Arranging target units at at least three marked positions of the drum, each of the target units comprising at least one target ball arranged on the outer circumferential surface of the drum and spaced apart along the circumferential direction, and the at least three marked positions are sequentially spaced apart along the length direction of the drum;

[0007] The coordinates of the target ball are measured using a laser tracker, and then the drum is rotated at least twice, and the coordinates of the target ball are measured after each rotation is completed;

[0008] Based on the coordinates of the target sphere measured multiple times, the coordinates of the center of the circle of the calibration position are obtained;

[0009] Based on the coordinates of the center of at least three calibrated positions of the roll, the coaxiality of the roll is obtained, and the roll is assembled and adjusted until the coaxiality of the roll is less than a first threshold value;

[0010] After the coaxiality of the plurality of reels is adjusted, the coordinates of the target ball are measured by a laser tracker, the coordinates of the center of the circle of the calibrated position are re-determined, the rotary device is controlled to rotate at least twice, and the coordinates of the center of the circle of the calibrated position are re-determined after each rotation is completed;

[0011] Based on the coordinates of the center of the calibration position determined multiple times, the rotating surface of the rotating device is determined, the verticality of the roll is obtained, and the assembly and adjustment are performed until the verticality of the roll is less than a second threshold.

[0012] In one or more embodiments, the step of obtaining the coaxiality of the roll based on the center coordinates of at least three calibrated positions of the roll comprises:

[0013] Based on the coordinates of the centers of at least three calibrated positions of the reel, a first center column is obtained, where the first center column is a cylinder with the smallest diameter that encloses the centers of all calibrated positions;

[0014] Based on the diameter of the first center column and the spacing between adjacent calibration positions, the coaxiality of the roll is obtained.

[0015] In one or more embodiments, the step of determining the rotation surface of the rotating device based on the center coordinates of the calibration position determined multiple times to obtain the verticality of the roll includes:

[0016] Constructing a plane of the center of the circle of the calibration position determined multiple times as a rotation surface of the rotation device;

[0017] Based on the coordinates of the center of at least three calibrated positions of the roll, a first center column of the roll is obtained, wherein the first center column is a cylinder with the smallest diameter that encloses the centers of all the calibrated positions;

[0018] The central axis of the first central column of the drum is used as the center line of the drum, and the angle between the center line and the rotating surface of the rotating device is calculated to obtain the verticality of the drum.

[0019] In one or more embodiments, it further includes:

[0020] After the verticality of the plurality of rolls is adjusted, the coordinates of the center of the circle of the calibrated position of the roll are re-determined, and then the rotating device is controlled to rotate at least twice, and after each rotation is completed, the coordinates of the center of the circle of the calibrated position of the roll are re-determined;

[0021] Based on the coordinates of the center of the calibration position determined multiple times, the coaxiality of the rotary device is obtained, and the assembly and adjustment are performed until the coaxiality of the rotary device is less than a third threshold value;

[0022] After the coaxiality of the rotating device is adjusted, the symmetry of the plurality of rolls is calculated, and the assembly and adjustment are performed until the symmetry of the plurality of rolls is less than a fourth threshold value.

[0023] In one or more embodiments, the step of obtaining the coaxiality of the rotary device based on the center coordinates of the calibration positions determined multiple times includes:

[0024] Based on the coordinates of the center of the calibration position determined multiple times, obtaining the rotation center corresponding to the calibration position;

[0025] Based on the rotation centers corresponding to the multiple calibration positions, the coaxiality of the rotation device is obtained.

[0026] In one or more embodiments, the step of obtaining the coaxiality of the rotating device by the rotation centers corresponding to the plurality of calibrated positions comprises:

[0027] Based on the rotation centers corresponding to the plurality of calibration positions, a second center column is obtained, where the second center column is a cylinder with the smallest diameter that encloses the rotation centers corresponding to all the calibration positions;

[0028] Based on the diameter of the second center column and the spacing between adjacent calibration positions, the coaxiality of the rotary device is obtained.

[0029] In one or more embodiments, after the coaxiality of the rotating device is adjusted, the step of calculating the symmetry of the plurality of rolls comprises:

[0030] After the coaxiality of the rotating device is adjusted, the second center column is re-determined, and the central axis of the second center column is used as the center line of the rotating device. The distances between the multiple reels and the center line are calculated to obtain the symmetry of the multiple reels.

[0031] In one or more embodiments, the target unit further includes an annular tooling, which is sleeved and mounted on the drum, and a plurality of evenly spaced positioning holes are arranged on the outer ring surface of the annular tooling, the positioning holes match the shape of the target ball, and the target ball is at least partially embedded in the positioning holes and installed.

[0032] In one or more embodiments, the target sphere is fixed to the annular tooling by magnetic attraction.

[0033] In one or more embodiments, the step of arranging target units at at least three marked positions of the reel is specifically: arranging a target unit on the outer side, the middle side and the inner side of the reel respectively.

[0034] Different from the prior art, the beneficial effects of this application are:

[0035] The present application arranges target balls at different positions on the outer circumference of the reel, uses a laser tracker to measure the target ball coordinates, and obtains multiple target ball coordinates by controlling the rotation of the reel and the rotation of the rotary device. Based on the multiple target ball coordinates, the coaxiality, verticality, symmetry of the reel and the coaxiality of the rotary device are measured, which helps to improve the precision adjustment efficiency of the rotary winder and improve the assembly efficiency, production efficiency and assembly accuracy of the winder. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0037] Figure 1 It is a structural schematic diagram of an embodiment of a double-drum rotary winder of the present application;

[0038] Figure 2 It is a flow chart of an implementation method of a precision adjustment method of a rotary coiler of the present application;

[0039] Figure 3 yes Figure 2 A schematic diagram of a flow chart of an implementation method corresponding to S400;

[0040] Figure 4 is a schematic diagram of an implementation of the first central column of the present application;

[0041] Figure 5 yes Figure 2 A schematic diagram of a flow chart of an implementation method corresponding to S600;

[0042] Figure 6 is a schematic diagram of an implementation of the rotation plane of the present application;

[0043] Figure 7 yes Figure 2 A flowchart of an implementation method corresponding to S800 in FIG. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0045] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0046] See also Figure 1 , Figure 1 It is a structural schematic diagram of an embodiment of a double-drum rotary winder of the present application.

[0047] like Figure 1 As shown, the double-drum rotary winder includes a rotating device and two drums arranged on the rotating device. During assembly, it is necessary to adjust the center of the drum to align with the rotating surface of the rotating device, and also to adjust the rotation center of the rotating device (also the rotation center of the secondary reducer) to align with the rotation center of the primary reducer. Finally, when the two drums, the rotating device, the primary reducer and the secondary reducer are assembled, the assembly accuracy of each component must be repeatedly adjusted.

[0048] At present, during the assembly process of the double-drum rotary winder, the precision adjustment process requires multiple measurements and adjustments with the help of equipment such as levels and steel wires, which requires a lot of energy and time and is not conducive to improving the assembly efficiency and production efficiency of the winder.

[0049] In order to solve the above problems, the applicant has developed a new precision adjustment method for a rotary winder. This method measures the coordinates of the target points on the reel using a laser tracker, and calculates the center axis, verticality and rotation center of each reel. The measured data helps to guide the rapid adjustment of the precision of the rotary winder to meet the preset conditions, thereby significantly improving the assembly efficiency and production efficiency of the winder.

[0050] For details, please refer to Figure 2 , Figure 2 It is a flow chart of an implementation method of a precision adjustment method of a rotary coiler of the present application.

[0051] like Figure 2 As shown, the method includes:

[0052] S100, arranging target units at at least three calibrated positions of the reel.

[0053] Each target point unit includes at least one target ball arranged on the outer circumferential surface of the drum and spaced apart along the circumferential direction, and at least three calibration positions are sequentially spaced apart along the length direction of the drum.

[0054] Specifically, in one embodiment, a target unit may be arranged on the outside, the middle and the inside of the roll respectively, and in this case, three calibration positions are arranged on the roll.

[0055] In one embodiment, each target unit may include only one target ball. In other embodiments, each target unit may include multiple target balls arranged at intervals along the circumference, for example, four target balls adjacent to each other at an interval of 90°, both of which can achieve the effect of the present embodiment.

[0056] In one embodiment, the target unit may include an annular tooling, and the annular tooling may be sleeved and installed on the reel. For example, the annular tooling may be fixed to the reel by bolts.

[0057] A plurality of evenly spaced positioning holes are arranged on the outer ring surface of the annular tooling, the positioning holes match the shape of the target ball, and the target ball is at least partially embedded in the positioning holes for installation.

[0058] In one embodiment, the target ball can be fixed in the positioning hole by magnetic attraction. In other embodiments, the target ball can also be fixed in other ways, all of which can achieve the effect of this embodiment.

[0059] S200, using a laser tracker to measure the coordinates of the target ball, then rotating the reel at least twice, and measuring the coordinates of the target ball after each rotation.

[0060] Specifically, the coordinates of the target ball may be measured once in the initial state, and then the reel may be rotated at least twice, for example, 90° each time, and the coordinates of the target ball may be measured again after the rotation.

[0061] Based on the above operations, at least three coordinates of the target ball at each calibrated position can be obtained, and the three coordinates are arranged around the center of the reel at the calibrated position.

[0062] S300, based on the coordinates of the target sphere measured multiple times, obtain the coordinates of the center of the calibration position.

[0063] It can be understood that a circle can be determined using three points and the coordinates of the center of the circle can be obtained; based on the coordinates of the target sphere measured multiple times, the coordinates of the center of the circle at the calibration position can be obtained.

[0064] S400, based on the center coordinates of at least three calibrated positions of the roll, obtain the coaxiality of the roll, and assemble and adjust until the coaxiality of the roll is less than a first threshold.

[0065] Since the coordinates of the center of at least three intervals of the roll are known, the coaxiality of the roll can be obtained. For details, please refer to Figure 3 , Figure 3 yes Figure 2 A flow chart of an implementation method corresponding to S400 in FIG.

[0066] like Figure 3 As shown, the method for obtaining the coaxiality of the roll includes:

[0067] S401. Obtain a first center column based on the center coordinates of at least three calibrated positions of the reel.

[0068] The first center column is a cylinder with the smallest diameter that surrounds the centers of all calibrated positions.

[0069] See also Figure 4 , Figure 4 It is a schematic diagram of an implementation of the first central column of the present application.

[0070] like Figure 4 As shown, based on the coordinates of the center of the circle at the three calibrated positions, a first center column that wraps the entire center of the circle can be constructed. The first center column is the actual center line of the roll in the figure.

[0071] Based on the actual center line and theoretical center line of the roll, the coaxiality of the roll can be obtained.

[0072] S402: Obtain the coaxiality of the roll based on the diameter of the first center column and the spacing between adjacent calibration positions.

[0073] Based on the diameter φd of the first center column and the spacing L between adjacent calibration positions, the coaxiality φd / L of the roll can be obtained.

[0074] Based on the measured coaxiality of the roll, the assembly of the roll may be adjusted so that the coaxiality of the roll is less than a first threshold.

[0075] The first threshold is preset based on actual working conditions. In one exemplary embodiment, the first threshold may be 0.05 mm / m.

[0076] S500, after the coaxiality of the multiple reels is adjusted, the coordinates of the target ball are measured by a laser tracker, the coordinates of the center of the circle at the calibrated position are re-determined, the rotary device is controlled to rotate at least twice, and the coordinates of the center of the circle at the calibrated position are re-determined after each rotation is completed.

[0077] After the coaxiality of multiple reels is adjusted, the reels are controlled to rotate multiple times, and the coordinates of the target ball are measured after each rotation, and the coordinates of the center of the circle at the calibrated position are re-determined.

[0078] The rotary device is then controlled to rotate, and after each rotation is completed, the above steps are repeated to re-determine the center coordinates of the calibrated position.

[0079] S600, based on the coordinates of the center of the circle of the calibration position determined multiple times, determine the rotating surface of the rotating device, obtain the verticality of the roll, and assemble and adjust until the verticality of the roll is less than a second threshold.

[0080] For details, please refer to Figure 5 , Figure 5 yes Figure 2 A flowchart of an implementation method corresponding to S600 is shown in FIG.

[0081] like Figure 5 As shown, the method for obtaining the verticality of the roll includes:

[0082] S601, constructing a plane of the center of the circle of the calibration position determined multiple times as the rotation surface of the rotation device.

[0083] Since the coordinates of the center of the calibrated position are known when the rotating device rotates to different angles, a plane passing through the center of the calibrated position at all angles can be constructed, and this plane is the rotating surface of the rotating device.

[0084] See also Figure 6 , Figure 6 It is a schematic diagram of an implementation of the rotation plane of the present application.

[0085] like Figure 6 As shown, the rotation plane passes through the center of the calibration position at different angles.

[0086] S602: Obtain a first center column of the reel based on the coordinates of the center of at least three calibrated positions of the reel.

[0087] Similar to S401, the first center column of the reel is re-determined at this time.

[0088] S603, taking the central axis of the first central column of the reel as the center line of the reel, calculating the angle between the center line and the rotating surface of the rotating device to obtain the verticality of the reel.

[0089] The central axis of the first center column is the center line of the reel. The verticality of the reel can be obtained by calculating the angle between the center line of the reel and the rotating surface.

[0090] Based on the calculated verticality, assembly adjustment may be guided until the verticality is less than a second threshold.

[0091] The second threshold is data preset based on actual working conditions and can be adjusted based on the working conditions.

[0092] Based on the above steps, the coaxiality and verticality of the roll can be quickly adjusted, effectively improving the assembly accuracy of the roll.

[0093] To achieve the coaxiality of the rotating device and the symmetry of multiple rolls, please refer to Figure 1 , the method of the present application also includes:

[0094] S700, after the verticality of the plurality of rolls is adjusted, the center coordinates of the calibrated positions of the rolls are re-determined, and then the rotary device is controlled to rotate at least twice, and after each rotation is completed, the center coordinates of the calibrated positions of the rolls are re-determined.

[0095] Similar to S500, the center coordinates of the calibration position at different rotation angles of the rotating device are re-determined. In one embodiment, the initial state of the rotating device can be taken as 0°, and then the rotating device is rotated 90° and 180° respectively to obtain the center coordinates of the calibration position at 0°, 90°, and 180°.

[0096] S800, based on the coordinates of the center of the circle of the calibration position determined multiple times, obtain the coaxiality of the rotary device, and assemble and adjust until the coaxiality of the rotary device is less than a third threshold.

[0097] See also Figure 7 , Figure 7 yes Figure 2 A flowchart of an implementation method corresponding to S800 in FIG.

[0098] like Figure 7 As shown, the method for obtaining the coaxiality of the rotary device includes:

[0099] S801. Based on the coordinates of the center of the calibration position determined multiple times, obtain the rotation center corresponding to the calibration position.

[0100] Since the coordinates of the center of the calibration position at different rotation angles of the rotary device are known, a circle passing through the center of the calibration position at all angles can be constructed, and the circle is used as the rotation center corresponding to the calibration position.

[0101] S802: Based on the rotation centers corresponding to the multiple calibration positions, obtain the coaxiality of the rotation device.

[0102] Similar to S400, since the rotation centers of multiple calibration positions are known, a cylinder with the smallest diameter that encloses the rotation centers of all calibration positions can be constructed, that is, a second center column, which is the actual center axis of the rotating device.

[0103] Based on the diameter φD of the second center column and the spacing L between adjacent calibration positions, the coaxiality φD / L of the rotary device can be obtained.

[0104] Based on the measured coaxiality of the rotary device, the assembly of the rotary device may be adjusted so that the coaxiality of the rotary device is less than a third threshold value.

[0105] The third threshold is preset based on actual working conditions and can be adjusted based on the working conditions.

[0106] S900, after the coaxiality of the rotating device is adjusted, the symmetry of the multiple rolls is calculated, and the assembly and adjustment are performed until the symmetry of the multiple rolls is less than a fourth threshold value.

[0107] After the coaxiality of the rotating device is adjusted, the second center column can be re-determined, and the center line of the second center column is used as the center axis of the rotating device.

[0108] Then, the distance between the central axis of each roll and the central axis of the rotating device is calculated, thereby obtaining the symmetry of the multiple rolls.

[0109] Assembly adjustment is performed based on the measured symmetry until the symmetry is less than a fourth threshold.

[0110] The fourth threshold is preset based on actual working conditions and can be adjusted based on the working conditions.

[0111] Based on the above steps, the coaxiality of the rotary device and the symmetry of the drum can be quickly adjusted, effectively improving the assembly accuracy of the drum and the rotary device.

[0112] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0113] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for adjusting the precision of a rotary coiler, characterized in that: The rotary winder includes a rotary device and a plurality of winding drums, and the precision adjustment method includes: Arranging target units at at least three marked positions of the drum, each of the target units comprising at least one target ball arranged on the outer circumferential surface of the drum and spaced apart along the circumferential direction, and the at least three marked positions are sequentially spaced apart along the length direction of the drum; The coordinates of the target ball are measured using a laser tracker, and then the drum is rotated at least twice, and the coordinates of the target ball are measured after each rotation is completed; Based on the coordinates of the target sphere measured multiple times, the coordinates of the center of the circle of the calibration position are obtained; Based on the coordinates of the center of at least three calibrated positions of the roll, the coaxiality of the roll is obtained, and the roll is assembled and adjusted until the coaxiality of the roll is less than a first threshold value; After the coaxiality of the plurality of reels is adjusted, the coordinates of the target ball are measured by a laser tracker, the coordinates of the center of the circle of the calibrated position are re-determined, the rotary device is controlled to rotate at least twice, and the coordinates of the center of the circle of the calibrated position are re-determined after each rotation is completed; Based on the coordinates of the center of the calibration position determined multiple times, the rotating surface of the rotating device is determined, the verticality of the roll is obtained, and the assembly and adjustment are performed until the verticality of the roll is less than a second threshold.

2. The precision adjustment method according to claim 1, characterized in that: The step of obtaining the coaxiality of the drum based on the center coordinates of at least three calibrated positions of the drum comprises: Based on the coordinates of the centers of at least three calibrated positions of the reel, a first center column is obtained, where the first center column is a cylinder with the smallest diameter that encloses the centers of all calibrated positions; Based on the diameter of the first center column and the spacing between adjacent calibration positions, the coaxiality of the roll is obtained.

3. The precision adjustment method according to claim 1, characterized in that: The step of determining the rotation surface of the rotating device based on the center coordinates of the calibration positions determined multiple times to obtain the verticality of the roll includes: Constructing a plane of the center of the circle of the calibration position determined multiple times as a rotation surface of the rotation device; Based on the coordinates of the center of at least three calibrated positions of the roll, a first center column of the roll is obtained, wherein the first center column is a cylinder with the smallest diameter that encloses the centers of all the calibrated positions; The central axis of the first central column of the reel is used as the center line of the reel, and the angle between the center line and the rotating surface of the rotating device is calculated to obtain the verticality of the reel.

4. The precision adjustment method according to claim 1, characterized in that: Also includes: After the verticality of the plurality of rolls is adjusted, the coordinates of the center of the circle of the calibrated position of the roll are re-determined, and then the rotating device is controlled to rotate at least twice, and after each rotation is completed, the coordinates of the center of the circle of the calibrated position of the roll are re-determined; Based on the coordinates of the center of the calibration position determined multiple times, the coaxiality of the rotary device is obtained, and the assembly and adjustment are performed until the coaxiality of the rotary device is less than a third threshold value; After the coaxiality of the rotating device is adjusted, the symmetry of the plurality of rolls is calculated, and the assembly and adjustment are performed until the symmetry of the plurality of rolls is less than a fourth threshold value.

5. The precision adjustment method according to claim 4, characterized in that: The step of obtaining the coaxiality of the rotary device based on the center coordinates of the calibration positions determined multiple times comprises: Based on the coordinates of the center of the calibration position determined multiple times, obtaining the rotation center corresponding to the calibration position; Based on the rotation centers corresponding to the multiple calibration positions, the coaxiality of the rotation device is obtained.

6. The precision adjustment method according to claim 5, characterized in that: The step of obtaining the coaxiality of the rotating device by using the rotation centers corresponding to the plurality of calibrated positions comprises: Based on the rotation centers corresponding to the plurality of calibration positions, a second center column is obtained, where the second center column is a cylinder with the smallest diameter that encloses the rotation centers corresponding to all the calibration positions; Based on the diameter of the second center column and the spacing between adjacent calibration positions, the coaxiality of the rotary device is obtained.

7. The precision adjustment method according to claim 6, characterized in that: After the coaxiality of the rotating device is adjusted, the step of calculating the symmetry of the plurality of rolls comprises: After the coaxiality of the rotating device is adjusted, the second center column is re-determined, and the central axis of the second center column is used as the center line of the rotating device. The distances between the multiple reels and the center line are calculated to obtain the symmetry of the multiple reels.

8. The precision adjustment method according to claim 1, characterized in that: The target point unit also includes an annular tooling, which is sleeved and installed on the reel, and a plurality of evenly spaced positioning holes are arranged on the outer ring surface of the annular tooling, the positioning holes match the shape of the target ball, and the target ball is at least partially embedded in the positioning holes for installation.

9. The precision adjustment method according to claim 8, characterized in that: The target ball is fixed to the annular tooling by magnetic attraction.

10. The precision adjustment method according to claim 1, characterized in that: The step of arranging target units at at least three marked positions of the reel is specifically as follows: arranging a target unit at the outer side, the middle side and the inner side of the reel respectively.

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