Device and method for detecting roundness error of retainer

Abstract

The invention belongs to the field of irregular profile measurement, and particularly relates to a holder roundness error detection device and a detection method. In order to conveniently measure the roundness error of a retainer of a wind power bearing, the invention provides a retainer roundness error detection device which comprises a measuring head and at least three positioning pieces arranged on the same circumference corresponding to the guide surface of the retainer at intervals, and the central angles corresponding to arcs corresponding to all the positioning pieces are greater than 180 degrees; each positioning piece is used for being in contact with and movably matched with the guide surface of the retainer, the measuring head is fixedly connected to one positioning piece, and the measuring head is used for being in contact with the guide surface of the retainer so as to be used for measuring the guide surface of the retainer. The invention further provides a holder roundness error detection method adopting the holder roundness error detection device. According to the invention, the holder does not need to be moved to a measuring platform, but the detection device is moved to the holder, so that the roundness error of the holder can be measured conveniently.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of irregular contour measurement, and particularly relates to a retainer roundness error detection device and a detection method. BACKGROUND

[0002] The roundness error refers to the deviation degree of the actual shape of the inner and outer circumferential surfaces (also referred to as guide surfaces) of the retainer from a theoretical circle. When detecting whether the retainer of the bearing is qualified, the roundness error is a necessary index to be detected.

[0003] In the measurement, the V-shaped block and the measuring instrument (i.e., the three-point method) can be used to measure the roundness error. The workpiece is placed on the V-shaped block, the V-shaped block is used to support the workpiece and forms two-point contact with the outer circle of the workpiece, the measuring head of the measuring instrument forms third-point contact with the outer circle of the workpiece, then the workpiece is rotated for one revolution, and the maximum difference of the index of the measuring instrument is the roundness error. According to different statistical caliber, sometimes the roundness error is also half of the maximum difference.

[0004] Alternatively, the maximum diameter method can also be used for measurement. In the measurement, the maximum circle and the minimum circle corresponding to the outer circumferential surface (or the inner circumferential surface) of the retainer are measured, the maximum circle and the minimum circle share a common center, and the profile of the outer circumferential surface (or the inner circumferential surface) of the retainer is located between the maximum circle and the minimum circle. The roundness error Δ is equal to the maximum circle diameter D minus the minimum circle diameter d. In some cases, according to different statistical caliber, the roundness error can also be half of the difference between the maximum circle diameter and the minimum circle diameter (or the difference between the maximum circle radius and the minimum circle radius), i.e., Δ = (D-d) / 2; or the roundness error can also be half of the difference between the maximum circle radius and the minimum circle radius, i.e., Δ = (D-d) / 4.

[0005] When measuring the retainer of the wind power bearing, since the diameter of the retainer is very large, the retainer must be placed on the measurement platform and measured by using the three-coordinate measuring instrument. At this time, the measurement must be performed by rotating the measuring head, and cannot be performed by rotating the retainer (i.e., the measurement method in the three-point method).

[0006] However, in the measurement, on the one hand, the process of transferring the retainer to the measurement platform is very inconvenient, and the retainer is easily damaged due to bumping during the transfer process; on the other hand, the cost of the three-coordinate measuring instrument is high, so the number of on-site three-coordinate measuring instruments is small, which is not conducive to the measurement of the roundness error of the retainer in large quantities.

[0007] A wind power bearing retainer and a detection system thereof are disclosed in Chinese Patent Application No. CN118149751A, published on June 7, 2024. The detection system includes a workbench, a positioning seat and a driving mechanism installed on the workbench, and a measuring head installed at the output end of the driving mechanism.

[0008] In the measurement, the holder is first installed on the positioning seat to position the holder, then the driving mechanism drives the measuring head to measure the guide surface of the holder, and the computer judges whether the curve of the inner (or outer) circumferential surface of the holder is within the specified reference range, if yes, it proves that the roundness error is appropriate, and the holder is qualified, if not, it proves that the roundness error is not appropriate, and the holder is unqualified.

[0009] However, when using the above detection system, the holder still needs to be transported to the workbench (equivalent to the measurement platform), which is very inconvenient to transport, and the holder is easy to be damaged during transportation. SUMMARY

[0010] The purpose of the present application is to provide a holder roundness error detection device to solve the technical problems of the prior art that the holder needs to be moved to the measurement platform for measurement, which is very inconvenient to detect and the holder is easy to be damaged.

[0011] The purpose of the present application is also to provide a holder roundness error detection method to solve the same technical problems.

[0012] To achieve the above purpose, the technical scheme of the holder roundness error detection device provided by the present application is: A holder roundness error detection device, comprising a measuring head, further comprising at least three positioning members arranged at intervals on the same circumference corresponding to the guide surface of the holder, and the central angle corresponding to the arc lines of all positioning members is greater than 180°; all positioning members are connected to each other through a connecting structure, and each positioning member is used for contacting and movably cooperating with the guide surface of the holder, the measuring head is fixedly connected to one of the positioning members, and the measuring head is used for contacting with the guide surface of the holder for measuring the guide surface of the holder.

[0013] Further, the holder roundness error detection device comprises a measuring instrument, the measuring instrument has a dial for displaying readings and the measuring head; the measuring instrument is fixedly installed on the corresponding positioning member.

[0014] Further, the positioning member is a positioning cylinder, and the outer circumferential surface of the positioning cylinder is used for contacting and movably cooperating with the guide surface of the holder.

[0015] Further, the positioning member is divided into an auxiliary positioning member and a measurement positioning member, the measuring head is fixedly connected to the measurement positioning member, and the measurement positioning member and the auxiliary positioning member are fixedly connected to the connecting structure.

[0016] Further, the positioning members are divided into auxiliary positioning members and measuring positioning members, the measuring head is fixedly connected to the measuring positioning members, the measuring positioning members are fixedly connected to the connecting structure, and the auxiliary positioning members are rotatably connected to the connecting structure, so that the auxiliary positioning members can rotate and form auxiliary positioning wheels for rolling with the retainer.

[0017] Further, the positioning members are evenly distributed on the same circle, the connecting structure comprises a connecting ring and mounting rods connected to the connecting ring, the mounting rods extend along the radial direction of the connecting ring, and the mounting rods are evenly distributed along the same circle, the number of the mounting rods is the same as that of the positioning members, and each of the positioning members is mounted on a different mounting rod.

[0018] Further, the positioning members are provided with first guide holes for guiding and sliding along the mounting rods in the extension direction of the mounting rods and first threaded holes perpendicular to and communicating with the first guide holes, and a top pin with one end for abutting on the mounting rod to fix the positioning member is connected to the first threaded hole.

[0019] Further, the connecting ring is provided with second guide holes for guiding and sliding along the radial direction of the mounting rods and second threaded holes perpendicular to and communicating with the second guide holes, and a top pin with one end for abutting on the mounting rod to fix the mounting rod is connected to the second threaded hole.

[0020] Further, the mounting rods are hollow rods, so as to reduce the weight of the retainer roundness error detection device.

[0021] The retainer roundness error detection device provided by the present application has the following advantages: the present application is an improved invention. The main difference between the present application and the prior art is that in the prior art, the retainer needs to be positioned on a measuring platform, and then the measuring head is moved to detect the guide surface of the retainer. In the present application, the retainer roundness error detection device (hereinafter referred to as the detection device) is positioned on the retainer by at least three positioning members, and then the measuring head is moved by rotating the detection device to detect the guide surface of the retainer.

[0022] In use, the detection device is positioned on the retainer by the positioning members to avoid tilting of the detection device during rotation. At the same time, since the positioning members are arranged on the same circle and the central angles corresponding to the arc lines corresponding to all the positioning members are greater than 180°, the positioning members are always in contact with the retainer during rotation of the detection device, so as to position the relative positions of the measuring head connected to the positioning members and the retainer. Thus, the entire outer or inner circumferential surface of the retainer can be detected by the measuring head during rotation of the detection device, and the roundness error can be calculated.

[0023] To achieve the above-mentioned object, the technical scheme of the retainer roundness error detection method provided by the present application is as follows: The application discloses a cage roundness error detection method, which adopts a cage roundness error detection device to measure, wherein, during the measurement, first, all positioning members are in contact with the guide surface of the cage, and the measuring head is in contact with the corresponding guide surface of the cage; then, the cage roundness error detection device is rotated for at least one round, and the maximum value of the data measured by the measuring head is subtracted from the minimum value of the data measured, so as to obtain the roundness error. The cage roundness error detection device comprises a measuring head, at least three positioning members which are arranged at intervals on the same circumference corresponding to the guide surface of the cage, and the central angles corresponding to the arc lines of all the positioning members are greater than 180°; all the positioning members are connected with each other through a connecting structure, and each positioning member is used for being in contact with and movably matched with the guide surface of the cage; the measuring head is fixedly connected to one of the positioning members, and the measuring head is used for being in contact with the guide surface of the cage, so as to measure the guide surface of the cage.

[0024] Further, the cage roundness error detection device comprises a measuring instrument, the measuring instrument has a dial for displaying readings and the measuring head; and the measuring instrument is fixedly installed on the corresponding positioning member.

[0025] Further, the positioning member is a positioning cylinder, and the outer circumferential surface of the positioning cylinder is used for being in contact with and movably matched with the guide surface of the cage.

[0026] Further, the positioning member is divided into an auxiliary positioning member and a measuring positioning member, the measuring head is fixedly connected to the measuring positioning member, and the measuring positioning member and the auxiliary positioning member are fixedly connected with the connecting structure.

[0027] Further, the positioning member is divided into an auxiliary positioning member and a measuring positioning member, the measuring head is fixedly connected to the measuring positioning member, the measuring positioning member is fixedly connected with the connecting structure, and the auxiliary positioning member is rotatably matched with the connecting structure, so that the auxiliary positioning member can rotate and form an auxiliary positioning wheel for rolling matching with the cage.

[0028] Further, the positioning members are arranged at intervals on the same circumference; the connecting structure comprises a connecting ring and a mounting rod connected with the connecting ring, the mounting rod extends along the radial direction of the connecting ring, the mounting rods are arranged at intervals on the same circumference, the number of the mounting rods is the same as that of the positioning members, and each positioning member is mounted on a different mounting rod.

[0029] Further, the positioning member is provided with a first guide hole for guiding and sliding matching with the mounting rod along the extending direction of the mounting rod and a first threaded hole which is perpendicular to the first guide hole and is in communication with the first guide hole, a top screw with one end used for abutting on the mounting rod to fix the positioning member is connected to the first threaded hole.

[0030] Further, the connecting ring is provided with a second guide hole for guiding and sliding with the mounting rod in the radial direction and a second threaded hole perpendicular to the second guide hole and communicating with the second guide hole, and a top pin is connected to the second threaded hole and one end of the top pin abuts against the mounting rod to fix the mounting rod.

[0031] Further, the mounting rod is a hollow rod to reduce the weight of the retainer roundness error detection device.

[0032] The retainer roundness error detection method provided by the application has the following beneficial effects: the main difference between the application and the prior art is that, in the prior art, the retainer needs to be positioned on a measuring platform, and then a measuring head is moved to detect the guide surface of the retainer; in the application, the retainer roundness error detection device (hereinafter referred to as the detection device) is positioned on the retainer by at least three positioning members, and then the measuring head is moved by rotating the detection device and detecting the guide surface of the retainer.

[0033] In use, the detection device is positioned on the retainer by the positioning members to avoid tilting of the detection device during rotation, and since the positioning members are arranged on the same circumference and the central angles corresponding to the arc lines corresponding to all the positioning members are greater than 180°, the positioning members are always in contact with the retainer during rotation of the detection device to position the relative positions of the measuring head connected to the positioning members and the retainer, so that the entire outer or inner circumferential surface of the retainer is detected by the measuring head during rotation of the detection device, and the roundness error can be calculated by the maximum diameter method. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 Fig. 1 is a structural schematic view of a retainer roundness error detection device of the application; Figure 2 Fig. 2 is a structural schematic view of the retainer roundness error detection device of the application for measuring the outer circumferential surface of a retainer.

[0035] Legend of reference signs: 1, connecting ring; 2, mounting rod; 3, auxiliary positioning member; 4, measuring positioning member; 5, measuring instrument; 5-1, measuring head; 6, top pin; 7, retainer. DETAILED DESCRIPTION

[0036] To solve the problems in the background art, the core inventive concept of the application is contrary to the concept of positioning the retainer on the measuring platform of the detection device in the prior art, and in the application, the retainer roundness error detection device (hereinafter referred to as the detection device) is positioned on the retainer, so that the retainer does not need to be moved, but the detection device is moved, thereby effectively avoiding damage to the retainer during transfer.

[0037] The application will be further described in detail in connection with the following examples.

[0038] The embodiment of the cage roundness error detection device provided by the application: As shown in Figures 1-2 As a basic embodiment, the cage roundness error detection device (hereinafter referred to as the detection device) includes a measurement head 5-1 and at least three positioning members (three in the figure) arranged at intervals on the same circumference corresponding to the guide surface (outer or inner circumferential surface) of the cage 7. The central angle corresponding to the arc corresponding to all positioning members is greater than 180° (the three positioning members are evenly distributed in the figure, so the central angle corresponding to the arc corresponding to all positioning members is 240°). All positioning members are connected to each other by a connecting structure, and each positioning member is used to contact and movably cooperate with the guide surface of the cage 7. The measurement head 5-1 is fixedly connected to one of the positioning members, and the measurement head 5-1 is used to contact the guide surface of the cage 7 for measuring the guide surface of the cage 7.

[0039] Among them, the measurement head 5-1 is a product in the prior art, and the contact measurement of the cage 7 is performed by the measurement head 5-1 in the prior art. It should be particularly pointed out that the laser sensor ranging method is not used to measure the track of the guide surface of the cage 7 in the prior art, because the sensitivity and accuracy of the laser sensor are too low, and the error is too large.

[0040] The detection device can be positioned on the cage 7 by the at least three positioning members, avoiding tilting of the detection device during rotation. At the same time, since the central angle corresponding to the arc corresponding to all positioning members is greater than 180°, the cage 7 cannot be moved radially after the detection device is installed on the cage 7, ensuring that the measurement head 5-1 rotates along the same circumference (the center of the circumference is located on the center line of the circumference surrounded by the positioning members, and the center of the cage 7 is also located on the center line of the circumference surrounded by the positioning members) and detects the entire outer or inner circumferential surface of the cage 7, thereby calculating the roundness error.

[0041] The center of the circumference measured by the measurement head 5-1 is located on the center line of the circumference surrounded by the positioning members (or the center line of the cage 7), and the maximum radius value of the radial plane of the cage 7 where the measurement head 5-1 is located is R max , and the minimum radius value is R min , then the roundness error of the guide surface (including the inner and outer circumferential surfaces) of the cage 7 is Δ=R max -R minSince the difference between the maximum value and the minimum value of the data measured by the measuring head 5-1 is equal to the difference between the maximum radius value and the minimum radius value, subtracting the maximum value of the data measured by the measuring head 5-1 from the minimum value of the data measured by the measuring head 5-1 can obtain the roundness error under a certain statistical caliber (maximum diameter method, Δ = (D-d) / 2, D is the maximum round diameter, and d is the minimum round diameter).

[0042] In an embodiment, the same as in the Chinese invention patent application with the application publication number CN118149751A, the data measured by the measuring head 5-1 can be collected by a computer, and the measuring head 5-1 and the computer can be connected by wires or wirelessly connected through Bluetooth, WIFI or 2.4G network. The computer can operate the collected data and calculate the difference between the maximum value and the minimum value of the data measured by the measuring head 5-1 (i.e., the roundness error).

[0043] In a preferred embodiment, the detection device includes a measuring instrument 5 (such as a circular dial gauge), which has a dial for displaying readings and the measuring head 5-1 described above. The measuring instrument 5 is an existing instrument, for example, it can be the measuring instrument 5 used in the existing three-point method, which will not be described here again. The measuring instrument 5 is fixedly installed on the corresponding positioning member.

[0044] In this embodiment, when detecting, the worker can slowly rotate the detection device and observe the readings of the measuring instrument 5 in real time, record the maximum value and the minimum value of the readings, and then calculate the difference between the maximum value and the minimum value of the data measured by the measuring head 5-1.

[0045] In this embodiment, the measuring head 5-1 does not need to be configured with a computer, which is conducive to saving costs, and the detection device is more easily moved, which is conducive to moving the detection device to each holder 7.

[0046] In an embodiment, as shown in Figures 1-2 The positioning member is a positioning cylinder, the outer circumferential surface of the positioning cylinder is used to contact and movably cooperate with the guide surface of the holder 7; the positioning member is divided into an auxiliary positioning member 3 and a measurement positioning member 4, the measuring head 5-1 is fixedly connected to the measurement positioning member 4, and the measurement positioning member 4 and the auxiliary positioning member 3 are fixedly connected to the connecting structure. The friction between the outer circumferential surface of the positioning cylinder and the guide surface of the holder 7 is sliding friction.

[0047] In another embodiment, referring to Figures 1-2As shown, unlike the above embodiment, the auxiliary positioning member 3 is rotatably connected with the connecting structure, so that the auxiliary positioning member 3 can rotate and form an auxiliary positioning wheel for rolling contact with the retainer 7. Specifically, the auxiliary positioning member 3 (i.e. auxiliary positioning cylinder) is provided with a through hole, and a bolt is screwed through the through hole and connected with the connecting structure, and the screw rod of the bolt forms the rotation shaft of the auxiliary positioning member 3. Of course, the auxiliary positioning member 3 can also be installed on the connecting structure by using a split pin, and the split pin forms the rotation shaft of the auxiliary positioning member 3.

[0048] In other embodiments, a wheel can also be directly installed on the connecting structure, and the wheel is used to contact the retainer 7 and form the auxiliary positioning member 3.

[0049] In the above embodiment, the friction between the auxiliary positioning member 3 and the retainer 7 is rolling friction, which is beneficial to reduce the friction between the detection device and the retainer 7 and facilitate manual rotation of the detection device.

[0050] In other embodiments, the positioning member can also be a cuboid positioning block, an arc-shaped positioning block, etc., as long as all the positioning members have a complete inscribed circle (corresponding to the outer circumferential surface of the retainer 7) and / or a complete circumscribed circle (corresponding to the inner circumferential surface of the retainer 7).

[0051] Of course, a single detection device can be used to measure only the outer circumferential surface of the retainer 7, and another detection device can be used to measure the inner circumferential surface of the retainer 7.

[0052] In order to simplify the structure, in one embodiment, the positioning members are evenly spaced on the same circumference, the connecting structure includes a connecting ring 1 and mounting rods 2 connected with the connecting ring 1, the mounting rods 2 extend along the radial direction of the connecting ring 1, and the mounting rods 2 are evenly spaced along the same circumference, the number of mounting rods 2 is the same as the number of positioning members, and each positioning member is installed on a different mounting rod 2. The structure is simple, the weight of the detection device is lighter, and it is easy to move.

[0053] In Figures 1-2 In the embodiment shown, all the mounting rods 2 are located in the same plane (or at the same axial height), and all the positioning members are also located in the same plane (or at the same axial height), so that the structure is simple and it is easy to ensure that all the positioning members contact the retainer 7 at the same time.

[0054] Preferably, the mounting rods 2 are hollow rods, so as to reduce the weight of the retainer roundness error detection device and make it easier for the worker to move the detection device.

[0055] In other embodiments, the positioning members can also be arranged at intervals instead of being uniformly distributed. For example, there are three positioning members, the central angle of the circle corresponding to the line connecting two of them is 90°, the central angle of the circle corresponding to the line connecting one of them and the other one is 91°, and the central angle of the circle corresponding to the line connecting the other one and the other one is 179°. The included angle between the mounting rods 2 matches the central angle corresponding to the positioning members. At this time, the central angle of the arc corresponding to all the positioning members is 181°.

[0056] The number and arrangement of the positioning members can be set as needed by those skilled in the art.

[0057] In a preferred embodiment, as shown in Figure 1 the first guide hole for guiding and sliding along the extension direction of the mounting rod 2 and the first threaded hole perpendicular to and communicating with the first guide hole are arranged on the positioning member, and the first threaded hole is connected with a top pin 6 having one end for abutting on the mounting rod 2 to fix the positioning member.

[0058] In use, the top pin 6 can be loosened first, then the positioning member is moved to the appropriate position, and finally the top pin 6 is tightened again to adapt to different specifications of the retainer 7, which is beneficial to reduce the number and specifications of the on-site detection device and facilitate on-site management. On this basis, the measuring instrument 5 can be installed in a normal direction (the measuring head 5-1 faces inward) or in a reverse direction (the measuring head 5-1 faces outward) to measure the outer and inner circumferential surfaces of the retainer 7, respectively. The measuring instrument 5 is installed on the positioning member by bolts (the positioning member is provided with a threaded hole, and the measuring instrument 5 is provided with a mounting hole for the bolts to pass through).

[0059] In the embodiment shown in Figure 1 the second guide hole for guiding and sliding along the radial direction of the mounting rod 2 and the second threaded hole perpendicular to and communicating with the second guide hole are arranged on the connecting ring 1, and the second threaded hole is connected with a top pin 6 having one end for abutting on the mounting rod 2 to fix the mounting rod 2.

[0060] In use, the position of the positioning member can be adjusted by adjusting the top pin 6 connected with the second threaded hole, and the adjustment radius of the positioning member is increased, so that the detection device can be applied to more specifications of the retainer 7. On the basis of the first threaded hole on the positioning member cooperating with the first top pin 6, the position of the positioning member can also be adjusted twice to make the detection device applicable to more specifications of the retainer 7.

[0061] Of course, in other embodiments, when the detection device is only used to detect the guide surface of one specification of the retainer 7, the positions of the positioning members do not need to be adjusted, and the connecting ring 1 and the mounting rod 2 can be fixedly connected by welding or the like, and the positioning members can be fixedly connected with the mounting rod 2 by welding or the like. At this time, the on-site detection devices of various specifications need to be classified and managed.

[0062] In other embodiments, the connecting structure can also be a circular plate, and all the positioning members are installed on the same plate surface of the circular plate; to reduce the weight of the detection device, weight-reducing holes can also be formed on the circular plate.

[0063] The connecting structure can be set according to actual needs by those skilled in the art, and only the connecting structure is used to connect all the positioning members, so that all the positioning members are located at positions corresponding to the outer circumferential surface (or the inner circumferential surface) of the retainer 7.

[0064] In the present application, the retainer 7 of the wind power bearing is made of brass, which has good corrosion resistance and can be used in humid, acidic and alkaline environments and is not prone to rust; the positioning cylinder is a hollow cylinder with closed ends, and threaded holes are formed on the end faces of the hollow cylinder, the threaded holes on one end face are used to install the jackscrew 6, and the threaded holes on the other end face are used to install the measuring instrument 5 (according to needs, the auxiliary positioning cylinder does not install the measuring instrument 5). The installation rod 2 can be a hollow circular rod, preferably a hollow square rod, the first guide hole on the positioning cylinder is a square hole to facilitate the guidance of the positioning cylinder and prevent unnecessary rotation of the positioning cylinder when the jackscrew 6 is not tightened; similarly, the second guide hole on the connecting ring 1 can also be a square hole; the connecting ring 1, the positioning member and the installation rod 2 are preferably metal parts, which have long service lives.

[0065] The embodiment of the retainer roundness error detection method provided by the present application is as follows: Referring to Figures 1-2 The retainer roundness error detection method is as follows: the retainer roundness error detection device is used for measurement, during measurement, first, all the positioning members are brought into contact with the guide surface of the retainer 7, and the measuring head 5-1 is brought into contact with the corresponding guide surface of the retainer 7, then the retainer roundness error detection device is rotated at least one time, and the maximum value of the data measured by the measuring head 5-1 is subtracted from the minimum value of the data measured to obtain the roundness error.

[0066] The retainer roundness error detection device is any one of the embodiments of the retainer roundness error detection device of the present application, and will not be described here.

[0067] Finally, it needs to be explained that the above-mentioned is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application is described in detail with reference to the foregoing embodiments, for the person skilled in the art, still can not need to pay the creative labor to modify the technical scheme recorded in the foregoing each embodiment, or to carry out the equivalent replacement to part technical features, or to carry out the organic combination to different embodiments, thereby the embodiment given in the drawing is combined, of course, the person skilled in the art can also combine the embodiment not given in the remaining description drawing of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cage roundness error detection device, comprising a measuring head, characterized in that, It also includes at least three positioning elements spaced apart on the same circumference corresponding to the guide surface of the cage, and the central angle corresponding to the arc of all positioning elements is greater than 180°; all positioning elements are interconnected by a connecting structure, and each positioning element is used to contact and move with the guide surface of the cage, and the measuring head is fixedly connected to one of the positioning elements, and the measuring head is used to contact the guide surface of the cage for measuring the guide surface of the cage.

2. The cage roundness error detection device as described in claim 1, characterized in that, The cage roundness error detection device includes a measuring instrument having a dial for displaying readings and a measuring head; the measuring instrument is fixedly mounted on a corresponding positioning component.

3. The cage roundness error detection device as described in claim 1 or 2, characterized in that, The positioning element is a positioning cylinder, the outer circumferential surface of which is used to contact and move with the guide surface of the cage.

4. The cage roundness error detection device as described in claim 3, characterized in that, The positioning components are divided into auxiliary positioning components and measuring positioning components. The measuring head is fixedly connected to the measuring positioning components, and both the measuring positioning components and the auxiliary positioning components are fixedly connected to the connecting structure.

5. The cage roundness error detection device as described in claim 3, characterized in that, The positioning components are divided into auxiliary positioning components and measuring positioning components. The measuring head is fixedly connected to the measuring positioning component, which is fixedly connected to the connecting structure. The auxiliary positioning component is rotatably engaged with the connecting structure so that the auxiliary positioning component can rotate and form an auxiliary positioning wheel for rolling engagement with the cage.

6. The cage roundness error detection device as described in claim 1 or 2, characterized in that, The positioning components are evenly distributed on the same circumference; the connecting structure includes a connecting ring and mounting rods connected to the connecting ring. The mounting rods extend radially along the connecting ring and are evenly distributed on the same circumference. The number of mounting rods is the same as the number of positioning components, and each positioning component is installed on a different mounting rod.

7. The cage roundness error detection device as described in claim 6, characterized in that, The positioning component is provided with a first guide hole for guiding and sliding with the mounting rod along the extension direction of the mounting rod and a first threaded hole that is perpendicular to and communicates with the first guide hole. A set screw is connected to the first threaded hole, one end of which is used to press against the mounting rod to fix the positioning component.

8. The cage roundness error detection device as described in claim 6, characterized in that, The connecting ring is provided with a second guide hole for radially guiding and sliding with the mounting rod and a second threaded hole that is perpendicular to and communicates with the second guide hole. A set screw with one end pressing against the mounting rod is connected to the second threaded hole to fix the mounting rod.

9. The cage roundness error detection device as described in claim 6, characterized in that, The mounting rod is hollow to reduce the weight of the cage roundness error detection device.

10. A method for detecting cage roundness error, characterized in that, The cage roundness error detection device according to any one of claims 1 to 9 is used for measurement. During the measurement, firstly, all positioning parts are made to contact the guide surface of the cage, and the measuring head is made to contact the corresponding guide surface of the cage. Then, the cage roundness error detection device is rotated at least one revolution, and the maximum value of the data measured by the measuring head is subtracted from the minimum value of the measured data to obtain the roundness error.

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