auxiliary positioning device

Abstract

The present disclosure relates to an auxiliary positioning device for positioning the outer circumferential surface of a shaft, the shaft having a shaft body and a flange part at one end of the shaft body, the flange part having a flange surface facing the shaft body and a plurality of connecting holes arranged in an annular array around the axis of the shaft, a connecting part passing through the connecting hole and locked on the flange surface, the auxiliary positioning device comprising: a positioning part abutting against the connecting part and abutting against the flange surface; an extension part connected with the positioning part and extending along the axis of the shaft away from the flange part; and a positioner connected with the extension part, the positioner having a preset distance from the positioning part along the axis of the shaft, the positioner being arranged towards the shaft body and used for indicating a positioning point on the outer circumferential surface of the shaft body. The technical solution provided by the present disclosure can improve the accuracy of positioning and facilitate operation.

Description

Technical Field

[0001] This disclosure relates to the technical field of wind power load testing, and in particular to an auxiliary positioning device. Background Technology

[0002] Measuring the bending moment and torque of the wind turbine's main shaft is a core step in ensuring the safe operation of the unit, verifying the effectiveness of the design, and optimizing operation and maintenance strategies. The current method involves attaching strain gauges at multiple equally spaced points on the same cross-section of the main shaft using a flexible measuring tape, and then using the strain values ​​in different directions of the strain gauges to infer the corresponding load type.

[0003] However, since the strain gauge is attached to one end of the spindle in a funnel shape, meaning that both the axial and circumferential directions of the strain gauge's attachment area are arc surfaces, the flexible ruler measurement method is difficult to operate and inaccurate, thus affecting the final load test results. Utility Model Content

[0004] The purpose of this disclosure is to provide an auxiliary positioning device that can improve positioning accuracy and is easy to operate.

[0005] According to one aspect of this disclosure, an auxiliary positioning device is provided for positioning the outer peripheral surface of a shaft member. The shaft member has a shaft body and a flange portion located at one end of the shaft body. The flange portion has a flange face facing the shaft body and a plurality of connecting holes arranged in a circular array around the axis of the shaft member. A connecting pair portion passes through the connecting holes and is locked onto the flange face. The auxiliary positioning device includes: a positioning member abutting against the connecting pair and the flange face; an extension member connected to the positioning member and extending along the axis of the shaft member away from the flange portion; and a locator connected to the extension member, the locator having a predetermined distance between itself and the positioning member along the axial direction of the shaft member, the locator being positioned towards the shaft body and used to indicate a positioning point on the outer peripheral surface of the shaft body.

[0006] The technical solution provided in this disclosure utilizes the characteristic of multiple connecting pairs arranged in a circular array. By abutting the positioning element against an equal number of connecting pairs at intervals, multiple equally spaced positioning points along the circumference can be obtained through a positioner. Simultaneously, by abutting the positioning element against the flange face, leveraging the high precision of the flange face as a machined surface, the accuracy of the axial position of the multiple positioning points along the shaft can be guaranteed. In summary, the auxiliary positioning device can utilize multiple connecting pairs and flange faces for abutment positioning to obtain multiple equally spaced positioning points on the same cross-section of the shaft, avoiding the inaccuracies of flexible measuring tape measurements, thereby simplifying the positioning operation, improving positioning accuracy, and ensuring measurement accuracy.

[0007] Optionally, the locator is a light emitter; the light emitted by the locator forms a light spot on the outer peripheral surface of the shaft, so as to indicate the positioning point through the light spot.

[0008] With the above solution, the positioner can achieve positioning without contacting the outer circumferential surface of the shaft. The length of the positioner does not need to be too large, and interference between the positioner and other components can be avoided during operation, making operation convenient.

[0009] Optionally, the positioner is a contact element; the positioner contacts the outer peripheral surface of the shaft to indicate the positioning point through the contact point between the positioner and the outer peripheral surface of the shaft.

[0010] The above solution results in a simpler contact structure and lower manufacturing costs, thus reducing production costs.

[0011] Optionally, the positioner is connected to the extension via an adjusting member, and the adjusting member and the extension are axially adjustable along the shaft.

[0012] With the above scheme, the positioner and the extension can be adjusted relative to each other along the axial direction of the shaft, thereby adjusting the preset distance between the positioner and the positioning member along the axial direction of the shaft to adapt to different axial positions.

[0013] Optionally, the adjusting member includes a connecting seat and a clamping plate; the positioner is connected to the connecting seat, the connecting seat and the clamping plate are located on opposite sides of the extension member, and the connecting seat and the clamping plate are connected by fasteners and clamp the extension member.

[0014] With the above solution, when it is necessary to adjust the preset distance between the positioner and the locating element along the axial direction of the shaft, the fasteners can be loosened first, while ensuring the connection between the fasteners and the connecting seat and clamping plate. Then, the adjusting element can be pushed along the extension to adjust the preset distance between the positioner and the locating element along the axial direction of the shaft. Once the desired preset distance is reached, the fasteners are tightened again to secure the connecting seat and clamping plate to the extension. This eliminates the need to remove the adjusting element and positioner from the extension during adjustment, facilitating the adjustment operation and enabling stepless adjustment, thus expanding the adjustment range.

[0015] Optionally, the positioning element includes a first positioning plate and a second positioning plate; the first positioning plate is connected to the extension member, the side of the first positioning plate away from the extension member abuts against the flange surface, the first positioning plate has a mating surface, the mating surface abuts against the connecting pair; the second positioning plate is connected to the first positioning plate, the second positioning plate abuts against the outer peripheral surface of the flange portion.

[0016] The above scheme utilizes the contact between the mating surfaces and the connecting pairs, as well as the contact between the second positioning plate and the outer circumferential surface of the flange, to allow the positioning component to be limited at multiple points, reducing the shaking of the positioning component and ensuring the relative accuracy of its position.

[0017] Optionally, the mating surface abuts against the gasket of the connecting pair; or, the mating surface abuts against the bolt of the connecting pair.

[0018] Optionally, the auxiliary positioning device further includes a pressure sleeve and a clamping nut; the pressure sleeve is fitted onto the nut of the connecting pair, the clamping nut is threadedly connected to the screw of the connecting pair, and one end of the clamping nut abuts against one end of the pressure sleeve so that the other end of the pressure sleeve presses the first positioning plate against the flange surface.

[0019] The above scheme allows the first positioning plate to be clamped between the pressure sleeve and the flange, preventing the auxiliary positioning device from moving away from the flange and ensuring the stability of the auxiliary positioning device's operation.

[0020] Optionally, there is one mating surface that spans across the connecting pair.

[0021] The above scheme allows for limiting the position of the auxiliary positioning device on each connecting pair by inserting the first positioning plate into the connecting pair through the mating surface and by having the second positioning plate abut against the outer circumferential surface of the flange. This ensures that the installation position of the auxiliary positioning device on each connecting pair is relatively consistent, thereby ensuring the accuracy of the axial spacing of the multiple positioning points.

[0022] Optionally, there are two mating surfaces, which are symmetrically arranged about a preset symmetrical surface. The contact point between the second positioning plate and the outer peripheral surface of the flange is located on the preset symmetrical surface. The first positioning plate is inserted between two adjacent connecting pairs, and the two mating surfaces abut against the two connecting pairs respectively.

[0023] With the above scheme, the first positioning plate can abut against two adjacent connecting pairs through two mating surfaces, and cooperate with the second positioning plate to abut against the outer peripheral surface of the flange to achieve limiting, ensuring that the installation position of the auxiliary positioning device is relatively consistent between each two adjacent connecting pairs, thereby ensuring the accuracy of the axial spacing of the multiple positioning points obtained. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A half-sectional schematic diagram of an auxiliary positioning device according to an embodiment of the present disclosure in an operational state is shown. Figure 2 A partial structural schematic diagram of an auxiliary positioning device according to an embodiment of the present disclosure in a working state is shown; Figure 3 It shows Figure 2 A half-section diagram of the middle section structure; Figure 4 A perspective view of an auxiliary positioning device according to an embodiment of the present disclosure is shown; Figure 5 An exploded schematic diagram of an auxiliary positioning device according to an embodiment of the present disclosure is shown; Figure 6 A schematic diagram of the structure of a locator according to another embodiment of the present disclosure is shown; Figure 7 A partial structural schematic diagram of an auxiliary positioning device in a working state according to another embodiment of the present disclosure is shown; Figure 8 It shows Figure 7 A half-section diagram of the middle section structure; Figure 9 A perspective view of an auxiliary positioning device according to another embodiment of the present disclosure is shown; Explanation of reference numerals in the attached figures: 10. Shaft; 11. Shaft body; 12. Flange; 13. Flange face; 14. Connecting pair; 100. Positioning component; 110. First positioning plate; 111. Mating surface; 120. Second positioning plate; 200. Extension parts; 300. Positioner; 400. Adjusting component; 410. Connecting seat; 420. Clamping plate; 510. Pressure sleeve; 520. Pressure nut. Detailed Implementation

[0026] Measuring the bending moment and torque of the wind turbine's main shaft is a core step in ensuring the safe operation of the unit, verifying the effectiveness of the design, and optimizing operation and maintenance strategies. The current mainstream testing method involves measuring and marking multiple equally spaced points on the same cross-section of the main shaft using a flexible measuring tape, then attaching strain gauges accordingly. Finally, the strain values ​​in different directions of the strain gauges are used to infer the load type, such as bending moment and torque. However, in actual testing, since the main shaft is already installed at a high altitude, large measuring equipment cannot be used. Therefore, most existing methods rely on flexible measuring tapes. However, the strain gauge attachment area is concentrated at the funnel-shaped end of the main shaft, where both the axial and circumferential directions are curved surfaces. This makes flexible measuring tape measurement difficult to operate and makes it hard to guarantee the accuracy of the point spacing, thus affecting the strain gauge placement accuracy and ultimately negatively impacting the reliability of the load test results.

[0027] To address this, the present disclosure redesigns the auxiliary positioning device for the strain gauge. This auxiliary positioning device engages with the flange face at one end of the spindle for positioning. By utilizing the precision of the flange face as the machining surface, the accuracy of the axial position is ensured. At the same time, the auxiliary positioning device utilizes the connecting pair connected to the flange to ensure the accuracy of circumferential equidistant positioning, thereby simplifying the positioning operation, improving the positioning accuracy, and ensuring the measurement accuracy.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this disclosure, but not all embodiments.

[0029] This disclosure provides an auxiliary positioning device for positioning the outer peripheral surface of a shaft 10. The shaft 10 may have a shaft body 11 and a flange portion 12 located at one end of the shaft body 11. The flange portion 12 has a flange surface 13 facing the shaft body 11 and a plurality of connecting holes arranged in a circular array around the axis of the shaft 10, or in other words, the plurality of connecting holes are equally spaced around the axis of the shaft 10. A connecting pair 14 partially passes through the connecting holes and is locked onto the flange surface 13.

[0030] For example, this auxiliary positioning device can be applied to load testing of the shaft 10 to position the shaft 10, facilitating the attachment of strain gauges, ensuring the accuracy of strain gauge attachment, and improving testing precision. Of course, this auxiliary positioning device can also be applied to drilling or milling operations; this disclosure does not specifically limit its application. The shaft 11 can be a shaft with a constant cross-section, or it can include a variable cross-section portion, for example... Figure 1As shown, one end of the shaft 11 may have a flared portion, and the flange portion 12 is located at the end of the flared portion. Taking the application of the auxiliary positioning device in the load test of the shaft component 10 after installation in a wind turbine generator set as an example, the shaft component 10 may be the main shaft of the wind turbine generator set. The flange portion 12 of the shaft component 10 is connected to the hub through the connecting pair 14. The auxiliary positioning device is used to assist in positioning multiple equally spaced positioning points on the outer circumferential surface of the shaft component 10 after installation, so that strain gauges can be attached to the positioning points respectively, thereby realizing online load testing.

[0031] Specifically, such as Figures 1 to 5 As shown, the auxiliary positioning device includes a positioning element 100, an extension element 200, and a positioner 300. The positioning element 100 abuts against the connecting pair 14 and the flange face 13. The extension element 200 is connected to the positioning element 100 and extends along the axis of the shaft 10 away from the flange portion 12. The positioner 300 is connected to the extension element 200, and a preset distance exists between the positioner 300 and the positioning element 100 along the axial direction of the shaft 10, fixing the relative positional relationship between the positioner 300 and the positioning element 100. The positioner 300 is positioned towards the shaft 11 and is used to indicate a positioning point on the outer circumferential surface of the shaft 11.

[0032] In this way, by utilizing the characteristic of multiple connecting pairs 14 arranged in a circular array, the positioning element 100 can be abutted against an equal number of connecting pairs 14, thereby obtaining multiple equally spaced positioning points along the circumference through the positioner 300. Simultaneously, by abutting the positioning element 100 against the flange surface 13, and taking advantage of the high precision of the flange surface 13 as a machined surface, the accuracy of the axial position of the multiple positioning points along the shaft 10 can be guaranteed. In summary, the auxiliary positioning device can utilize multiple connecting pairs 14 and the flange surface 13 for abutment positioning to obtain multiple equally spaced positioning points on the same cross-section of the shaft 10, avoiding the inaccuracies of flexible measuring tape measurements, thereby simplifying the positioning operation, improving positioning accuracy, and ensuring measurement accuracy.

[0033] In practical applications, the required number of positioning points can be pre-calculated by determining the angle between two adjacent positioning points. Then, the positioning component 100 is abutted against the first / first group of connecting pairs 14 (two adjacent connecting pairs 14), and the corresponding positioning point is obtained through the positioner 300. Next, the positioning component 100 is abutted against the second / second group of connecting pairs 14 (two adjacent connecting pairs 14), with an angle between the second / second group of connecting pairs 14 and the first / first group of connecting pairs 14. The corresponding positioning point is then obtained through the positioner 300. This process is repeated until the required number of equally spaced positioning points are obtained.

[0034] Regarding the specific structure of the locator 300, this disclosure provides two possible embodiments for reference.

[0035] Example 1, as Figure 3 and Figure 4 As shown, the positioner 300 can be a light emitter. The light emitted by the positioner 300 forms a light spot on the outer peripheral surface of the shaft 11, so as to indicate the positioning point through the light spot. In this way, the positioner 300 can achieve positioning without contacting the outer peripheral surface of the shaft 11, and the length of the positioner 300 does not need to be too large. During operation, interference between the positioner 300 and other components can be avoided, making operation convenient.

[0036] For example, the locator 300 may be a laser emitter or an infrared emitter, etc.

[0037] Example 2, as Figure 6 As shown, the positioner 300 is a contact element. The positioner 300 contacts the outer peripheral surface of the shaft 11 to indicate the positioning point through the contact point between the positioner 300 and the outer peripheral surface of the shaft 11. The contact element has a simpler structure and lower manufacturing cost, which can reduce production costs.

[0038] For example, the contact member can be a long ruler. The contact member and the extension 200 can be fixed relative to each other in the radial direction of the shaft 10. The contact member and the extension 200 can also slide relative to each other in the radial direction of the shaft 10 to accommodate different distances between the extension 200 and the outer peripheral surface of the shaft 10.

[0039] In some embodiments, the positioner 300 and the extension 200 can be fixed relative to each other along the axial position of the shaft 10.

[0040] In some other embodiments, such as Figure 4 and Figure 5 As shown, the positioner 300 and the extension 200 can be adjusted relative to each other along the axial direction of the shaft 10, thereby adjusting the preset distance between the positioner 300 and the positioner 100 along the axial direction of the shaft 10 to adapt to different axial positions. Specifically, the positioner 300 is connected to the extension 200 via an adjusting member 400, and the adjusting member 400 and the extension 200 are adjustablely connected along the axial direction of the shaft 10.

[0041] Regarding the specific structure of the adjusting member 400, in some embodiments, the adjusting member 400 may include a connecting seat 410 and a clamping plate 420. The positioner 300 is connected to the connecting seat 410, and the connecting seat 410 and the clamping plate 420 are located on opposite sides of the extension member 200. The connecting seat 410 and the clamping plate 420 are connected by fasteners and clamp the extension member 200. When it is necessary to adjust the preset distance between the positioner 300 and the positioning member 100 along the axial direction of the shaft 10, the fasteners can be loosened first, but the connection between the fasteners and the connecting seat 410 and the clamping plate 420 can still be maintained. Then, the adjusting member 400 can be pushed along the extension member 200 to adjust the preset distance between the positioner 300 and the positioning member 100 along the axial direction of the shaft 10. When the desired preset distance is reached, the fasteners are tightened again so that the connecting seat 410 and the clamping plate 420 are clamped and fixed on the extension member 200. In this way, during the adjustment process, there is no need to remove the adjusting component 400 and the positioner 300 from the extension component 200, which facilitates the adjustment operation and enables stepless adjustment, thus widening the adjustment range.

[0042] In some other embodiments, the adjusting member 400 may be provided with a through hole, and the extension member 200 may be provided with a plurality of threaded holes spaced apart along the axial direction of the shaft member 10. Fasteners pass through the through holes and connect to the threaded holes, so that by selecting to connect to different threaded holes, the preset distance between the positioner 300 and the positioner 100 along the axial direction of the shaft member 10 can be adjusted.

[0043] Regarding the specific structure of the positioning element 100, in some embodiments, such as Figures 2 to 9 As shown, the positioning member 100 includes a first positioning plate 110 and a second positioning plate 120. The first positioning plate 110 is connected to the extension member 200, and the side of the first positioning plate 110 away from the extension member 200 abuts against the flange face 13. The first positioning plate 110 has a mating surface 111, which abuts against the connecting pair 14. The second positioning plate 120 is connected to the first positioning plate 110 and abuts against the outer peripheral surface of the flange portion 12. Therefore, by utilizing the abutment of the mating surface 111 against the connecting pair 14 and the abutment of the second positioning plate 120 against the outer peripheral surface of the flange portion 12, the positioning member 100 can be limited at multiple points, reducing the shaking of the positioning member 100 and ensuring the relative accuracy of the positioning member 100's position.

[0044] Among them, the mating surface 111 and the connecting pair 14 can abut at multiple points, or the mating surface 111 and the connecting pair 14 can abut at each other.

[0045] For example, the mating surface 111 abuts against the gasket of the connecting pair 14, or the mating surface 111 abuts against the bolt of the connecting pair 14. Accordingly, the mating surface 111 is arc-shaped, and the arc shape of the mating surface 111 can match the outer peripheral surface shape of the gasket or bolt so that the mating surface 111 fits against the outer peripheral surface of the gasket or bolt.

[0046] In practical applications, the auxiliary positioning device can be prevented from moving away from the flange 12 by the user pressing it manually.

[0047] Of course, such as Figure 3 As shown, the auxiliary positioning device may also include a pressure sleeve 510 and a clamping nut 520. The pressure sleeve 510 is sleeved on the nut of the connecting pair 14, and the clamping nut 520 is threadedly connected to the screw of the connecting pair 14. One end of the clamping nut 520 abuts against one end of the pressure sleeve 510, so that the other end of the pressure sleeve 510 abuts against the first positioning plate 110 and the flange face 13. Thus, the first positioning plate 110 can be clamped between the pressure sleeve 510 and the flange portion 12 by the pressure sleeve 510, preventing the auxiliary positioning device from moving away from the flange portion 12 and ensuring the stability of the operation of the auxiliary positioning device.

[0048] In some embodiments, such as Figures 2 to 5 As shown, the first positioning plate 110 may have one mating surface 111, which spans across the connecting pair 14. Thus, by inserting the first positioning plate 110 onto the connecting pair 14 through the mating surface 111 and engaging the second positioning plate 120 against the outer peripheral surface of the flange portion 12, the positioning is limited, ensuring that the installation position of the auxiliary positioning device on each connecting pair 14 is relatively consistent, thereby ensuring the accuracy of the axial spacing of the multiple positioning points.

[0049] In some other embodiments, such as Figures 7 to 9 As shown, there may be two mating surfaces 111, which are symmetrically arranged about a preset symmetrical surface. The contact point between the second positioning plate 120 and the outer peripheral surface of the flange 12 is located on the preset symmetrical surface. The first positioning plate 110 is inserted between two adjacent connecting pairs 14, and the two mating surfaces 111 abut against the two connecting pairs 14 respectively. Thus, the first positioning plate 110 can abut against the two adjacent connecting pairs 14 through the two mating surfaces, and the second positioning plate 120 abuts against the outer peripheral surface of the flange 12 to achieve limiting, ensuring that the installation position of the auxiliary positioning device between each pair of adjacent connecting pairs 14 is relatively consistent, thereby ensuring the accuracy of the axial spacing of the multiple positioning points.

[0050] In this embodiment, a pressure sleeve 510 and a clamping nut 520 can be installed on either of the two connecting pairs 14, thereby clamping the first positioning plate 110 by the pressure sleeve 510. Of course, the pressure sleeve 510 and the clamping nut 520 can also be installed on the two connecting pairs 14 respectively.

[0051] The terms "upper" and "lower" used in this disclosure are used to describe the relative positional relationship of the various structures in the accompanying drawings. They are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this disclosure. Changes or adjustments to the relative relationships without substantially altering the technical content should also be considered as part of the scope of implementation of this disclosure.

[0052] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] Furthermore, in this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. An auxiliary positioning device, characterized in that, The auxiliary positioning device is used to position the outer peripheral surface of the shaft (10). The shaft (10) has a shaft body (11) and a flange portion (12) located at one end of the shaft body (11). The flange portion (12) has a flange surface (13) facing the shaft body (11) and a plurality of connecting holes arranged in a ring array around the axis of the shaft (10). A connecting pair (14) passes through the connecting holes and is locked onto the flange surface (13). The auxiliary positioning device includes: Positioning element (100), which abuts against the connecting pair (14) and the flange face (13); An extension (200) is connected to the positioning member (100) and extends along the axis of the shaft member (10) in a direction away from the flange portion (12); Positioner (300), the positioner (300) is connected to the extension (200), the positioner (300) is at a preset distance from the positioner (100) along the axial direction of the shaft (10), the positioner (300) is disposed toward the shaft (11) and is used to indicate a positioning point on the outer circumferential surface of the shaft (11).

2. The auxiliary positioning device according to claim 1, characterized in that, The locator (300) is a light emitter; The light emitted by the locator (300) forms a light spot on the outer peripheral surface of the shaft (11) to indicate the locating point.

3. The auxiliary positioning device according to claim 1, characterized in that, The positioner (300) is a contact element; The locator (300) contacts the outer peripheral surface of the shaft (11) to indicate the positioning point through the contact point between the locator (300) and the outer peripheral surface of the shaft (11).

4. The auxiliary positioning device according to claim 1, characterized in that, The positioner (300) is connected to the extension (200) via an adjusting member (400), and the adjusting member (400) and the extension (200) are axially adjustable along the shaft (10).

5. The auxiliary positioning device according to claim 4, characterized in that, The adjusting member (400) includes a connecting seat (410) and a clamping plate (420); The locator (300) is connected to the connecting seat (410), the connecting seat (410) and the clamping plate (420) are located on opposite sides of the extension (200), and the connecting seat (410) and the clamping plate (420) are connected by fasteners and clamp the extension (200).

6. The auxiliary positioning device according to any one of claims 1 to 5, characterized in that, The positioning element (100) includes a first positioning plate (110) and a second positioning plate (120); The first positioning plate (110) is connected to the extension (200), and the side of the first positioning plate (110) away from the extension (200) abuts against the flange surface (13). The first positioning plate (110) has a mating surface (111), and the mating surface (111) abuts against the connecting pair (14). The second positioning plate (120) is connected to the first positioning plate (110), and the second positioning plate (120) abuts against the outer peripheral surface of the flange (12).

7. The auxiliary positioning device according to claim 6, characterized in that, The mating surface (111) abuts against the gasket of the connecting pair (14); or, The mating surface (111) abuts against the bolt of the connecting pair (14).

8. The auxiliary positioning device according to claim 6, characterized in that, The auxiliary positioning device also includes a pressure sleeve (510) and a clamping nut (520). The pressure sleeve (510) is fitted onto the nut of the connecting pair (14), and the clamping nut (520) is threadedly connected to the screw of the connecting pair (14). One end of the clamping nut (520) abuts against one end of the pressure sleeve (510) so that the other end of the pressure sleeve (510) presses against the first positioning plate (110) and the flange surface (13).

9. The auxiliary positioning device according to claim 6, characterized in that, The mating surface (111) is one, and the mating surface (111) spans across the connecting pair (14).

10. The auxiliary positioning device according to claim 6, characterized in that, The mating surface (111) has two parts, and the two mating surfaces (111) are symmetrically arranged about a preset symmetrical surface. The contact point between the second positioning plate (120) and the outer peripheral surface of the flange (12) is located on the preset symmetrical surface. The first positioning plate (110) is inserted between two adjacent connecting pairs (14), and the two mating surfaces (111) abut against the two connecting pairs (14) respectively.

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