A radial perpendicularity gauge and method for a bow bearing cage

Abstract

The application discloses a radial perpendicularity testing fixture for a bow-shaped bearing retainer, which comprises a fixed probe, a movable probe and a measuring element, the movable probe is arranged to be movable at a first position and a second position, during detection, the fixed probe is tightly attached to the lower end of the retainer pressure slope surface, and the corresponding movable probe is located on the upper end of the retainer pressure slope surface; when the window hole perpendicularity is qualified, the movable probe and the fixed probe are vertically corresponding, i.e., located at the first position, at this time, the measured value of the measuring element is within the standard value range; when the window hole perpendicularity is unqualified, the movable probe and the fixed probe are not vertically corresponding, i.e., located at the second position, at this time, the measured distance value of the measuring element is out of the standard value range; according to the change of the measuring value of the measuring element, the perpendicularity of the retainer window hole can be quickly reflected, and the structure is simple and the detection efficiency is high.

Description

Technical Field

[0001] This application belongs to the field of bearing cage inspection, and particularly relates to a radial perpendicularity inspection tool and method for an arc-shaped bearing cage. Background Technology

[0002] The bow-shaped bearing cage, also known as the M-type cage, guides the needle rollers near its center. It offers good lubrication performance, external guidance, bearing load capacity, production efficiency, and raw material utilization. Currently, the common method for forming M-type cages in China is to use a die for stamping on a punch press. However, during punching of thin-walled M-type cages, uneven clearance between the punch and die, excessive punch penetration into the die, or excessively soft cage material can cause beam torsion. This results in the M-shaped cage opening being either narrower at the top and wider at the bottom, or vice versa. When the needle rollers rotate within this opening, they are prone to uneven wear, increased friction and heat, leading to softening of the bearing surface and abnormal spalling. As the spalling expands, foreign matter enters the cage opening, hindering cage operation and generating load, further accelerating cage wear.

[0003] To ensure that the processing quality of cage pockets meets the finished product requirements, it is necessary to strengthen the process control of the technical indicator "perpendicularity difference between the side beam of the cage pocket and the end face of the cage" during the processing of such cage pockets. For unqualified M-type cages that can be identified by the naked eye, they can be directly judged as unqualified products. For those that cannot be identified by the naked eye, it is necessary to use a cage pocket perpendicularity measuring instrument. Chinese utility model patent with patent number ZL201020592076.5 discloses a roller bearing cage beam perpendicularity measuring instrument, which discloses a technical solution for using a special probe combined with a dial indicator to specifically measure the perpendicularity of the cage pocket. However, the probe structure in this solution is complex, the specific installation and connection method is not disclosed, and the efficiency is low, which cannot achieve rapid detection. Furthermore, it cannot measure the tilt of the side beam towards the outer or inner ring of the bearing. Therefore, it is evident that the existing technology needs further improvement. Summary of the Invention

[0004] The present invention provides a radial perpendicularity gauge and method for a bow-shaped bearing cage, which at least solves or alleviates one or more technical problems in the prior art, or at least provides a beneficial alternative.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a radial perpendicularity gauge for an arc-shaped bearing cage, comprising:

[0006] The device includes a fixed probe, a movable probe, and a measuring element. The fixed probe is attached to the lower end of the retainer's pressure slope. The movable probe is located at the upper end of the retainer's pressure slope and can move radially along the retainer. The movable probe has a first position and a second position. When the movable probe is in the first position, the vertical projections of the fixed probe and the movable probe completely coincide. When the movable probe is in the second position, the vertical projections of the fixed probe and the movable probe partially coincide. The measuring element measures the moving distance of the movable probe to reflect the verticality of the retainer's window opening.

[0007] The radial perpendicularity gauge for the bow-shaped bearing cage of the present invention uses a fixed probe and a movable probe on a testing table. The movable probe can move to a first position and a second position. During testing, the fixed probe is pressed against the lower end of the cage's pressure slope, while the movable probe is positioned at the upper end of the cage's pressure slope. When the window hole perpendicularity is qualified, the movable probe and the fixed probe are vertically aligned, i.e., in the first position. At this time, the measured value is within the standard value range. When the window hole perpendicularity is unqualified, the movable probe and the fixed probe are not vertically aligned, i.e., in the second position. At this time, the measured distance value is outside the standard value range. Based on the change in the measured value, the perpendicularity of the cage window hole can be quickly reflected. The structure is simple, the testing efficiency is high, and it can not only detect cases where the window hole is wider at the top and narrower at the bottom or vice versa, but also detect the tilt of the window beam toward the inner or outer ring of the bearing, resulting in higher testing accuracy.

[0008] Preferably, the fixed probe is a first arc plate adapted to the size of the retainer window hole; the movable probe is a second arc plate adapted to the size of the retainer window hole, and the first arc plate and the second arc plate have the same shape and size.

[0009] By setting the fixed probe and the moving probe as arc plates adapted to the size of the window opening of the retainer, the arc plates enter the window opening and make point or line contact with the window beams on both sides. When the window beam or window opening is defective, the contact position between the arc plate surface of the moving probe and the window beam will change, so that the movement of the moving probe will change, thereby detecting different readings. The structural design is reasonable.

[0010] Preferably, the first arc plate is connected to the first horizontal plate, and the first horizontal plate is connected to the first column; the second arc plate is connected to the second horizontal plate, and the second horizontal plate is connected to the second column, so that the vertical distance between the first arc plate and the second arc plate is adapted to the height of the window opening of the retainer.

[0011] By replacing the first or second column with an opaque height, and using arc plates of different radii to accommodate arched retainers with different window opening heights and widths, one machine can be used for multiple purposes, reducing costs.

[0012] Preferably, the first column is detachably fixed to the fixed probe bracket, the second column is detachably connected to the movable probe bracket, the movable probe bracket is disposed on the first slider, the first slider is connected to the slide rail, the movable probe bracket is connected to the reset mechanism, and the reset mechanism enables the movable probe to switch between the first position and the second position.

[0013] By setting a reset mechanism, after the previous window hole measurement is completed, the moving probe can return to the first position corresponding to the fixed probe, so as to measure other windows holes.

[0014] Preferably, the measuring element is a dial indicator / micrometer, the measuring element is mounted on a measuring element mounting bracket, the movable probe bracket has an extension section, and the movable probe bracket moves so that the extension section abuts against the probe of the dial indicator / micrometer to display the change in moving distance.

[0015] Considering that the measured value of the bow-shaped bearing cage window that does not meet the actual perpendicularity requirement is only slightly different from the qualified value, dial indicators and micrometers have the advantages of simple structure, light weight, and low inertia of the rotating mechanism, and are suitable for the measurement of the bow-shaped bearing cage of this application.

[0016] Preferably, it also includes a positioning plate, the center lines of the positioning plate, the first arc plate and the second arc plate are parallel, the positioning plate is provided with a notch, the length of the notch is equal to the measurement depth of the fixed probe entering the cage window hole.

[0017] By setting a positioning plate and creating a notch in the positioning plate, the radial depth position of the fixed probe entering the window hole is kept consistent each time a measurement is taken, thereby improving the detection accuracy.

[0018] Preferably, it also includes a testing platform, wherein the positioning plate, the first arc plate, and the second arc plate are disposed on the testing platform, and the distance between the notched surface of the positioning plate and the highest point of the arc of the first arc plate is adapted to the outer diameter of the cage to be tested.

[0019] Preferably, the distance between the first and second arc plates and the positioning plate is adjustable to accommodate cages of different sizes.

[0020] Preferably, the first arc plate and the second arc plate / positioning plate are disposed on the second slider, the second slider is connected to the moving mechanism, and the movement of the moving mechanism causes the second slider to move so that the first arc plate and the second arc plate / positioning plate are relatively closer to or farther away from the positioning plate / first arc plate and the second arc plate.

[0021] Preferably, a method for using a radial perpendicularity gauge for a bow-shaped bearing cage includes the following steps:

[0022] S1: The second slider is moved by the moving mechanism so that the distance between the highest point of the arc of the first arc plate and the notch surface of the positioning plate is adapted to the outer diameter of the cage to be tested.

[0023] S2: Based on the height of the cage window opening to be tested, select appropriate first and second columns so that the distance between the first and second arc plates matches the height of the cage window opening, ensuring that the first arc plate can be tightly attached to the lower end of the cage slope and the second arc plate can be tightly attached to the upper end of the cage pressure slope. At this time, the second arc plate is in the second position.

[0024] S3: Zero the dial indicator, snap the middle part of the window beam of the standard retainer into the notch of the positioning plate, and insert the first and second arc plates into the window opening to measure the standard value of the retainer to be tested.

[0025] S4: Test the cage to be tested according to the steps in S3, record the values ​​of the dial indicator or micrometer, and compare them with the standard values. If there is an error between the values ​​and the standard values ​​and the error range is exceeded, it means that the verticality of the window hole of the cage to be tested does not meet the standard.

[0026] The above structure has the following beneficial effects:

[0027] 1. The radial perpendicularity gauge of the bow-shaped bearing cage of this application can quickly reflect the perpendicularity of the cage window hole. It has a simple structure and high detection efficiency. It can not only detect the case where the window hole is wider at the top and narrower at the bottom or vice versa, but also detect the tilt of the window beam toward the inner or outer ring of the bearing, thus achieving higher detection accuracy.

[0028] 2. The radial perpendicularity gauge for the bow-shaped bearing cage of this application has a notch in the positioning plate. When the middle part of the window beam of the bow-shaped cage enters the notch, the end of the fixed probe enters the window hole. The distance of the notch can be set to keep the distance of the fixed probe entering the window hole of the cage fixed. Therefore, the entry distance can be accurately controlled manually. The operation is simple and convenient, and the inspection cost is effectively reduced.

[0029] 3. The radial perpendicularity gauge for the bow-shaped bearing cage of this application has an adjustable distance between the positioning plate and the fixed and moving probes to accommodate bow-shaped cages of various sizes and specifications. It can replace the columns of different heights and the arc plates of different radii to adapt to bow-shaped cages with different window heights and widths, making it a multi-purpose machine with a wider range of applications.

[0030] 4. The method for detecting the radial perpendicularity of the bow-shaped bearing cage according to this application is simple, convenient, fast, efficient, and has higher detection accuracy. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain this application and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 A three-dimensional structural diagram of the fit of the bow-shaped bearing cage of this application placed in a perpendicularity gauge for inspection is shown.

[0033] Figure 2 A top view schematic diagram of the fit of the bow-shaped bearing cage of this application placed in a verticality gauge for inspection is shown;

[0034] Figure 3 A schematic diagram illustrating one embodiment of the perpendicularity gauge of this application is shown.

[0035] Figure 4 A schematic three-dimensional structural diagram of the perpendicularity gauge of this application is shown;

[0036] Figure 5 A schematic three-dimensional structural diagram of the reset mechanism of this application is shown;

[0037] Label Explanation:

[0038] 1-Fixed probe; 10-First arc plate; 11-First horizontal plate; 12-First column; 13-Fixed probe bracket;

[0039] 2-Moving probe; 20-Second arc plate; 21-Second horizontal plate; 22-Second column; 23-Moving probe bracket; 230-Extension section; 24-First slider; 25-Slide rail; 26-Reset mechanism; 260-Spring; 261-Limiting post; 262-Limiting plate;

[0040] 3-Measuring component; 30-Measuring component mounting bracket;

[0041] 4-Positioning plate; 40-Notch;

[0042] 5-Detection table; 50-Second slider; 51-Moving mechanism; 510-Lead screw; 511-Guide rod; 512-Handle; 513-Moving plate;

[0043] 6-Arch-shaped retainer; 60-Slope surface; 61-Window opening; 62-Window beam. Detailed Implementation

[0044] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0045] The present invention will now be described with reference to the accompanying drawings.

[0046] The specific solution adopted is as follows:

[0047] like Figure 1-5 As shown, the present invention provides a radial perpendicularity gauge for a bow-shaped bearing cage, comprising:

[0048] The device includes a fixed probe 1, a movable probe 2, and a measuring element 3. The fixed probe 1 is attached to the lower end of the retainer pressure slope 60. The movable probe 2 is located at the upper end of the retainer pressure slope 60 and can move radially along the retainer. The movable probe 2 has a first position and a second position. When the movable probe 2 is in the first position, the vertical projections of the fixed probe 1 and the movable probe 2 completely coincide. When the movable probe 2 is in the second position, the vertical projections of the fixed probe 1 and the movable probe 2 partially coincide. The measuring element 3 measures the moving distance of the movable probe 2 to reflect the verticality of the retainer window 61.

[0049] Specifically, the first position is the position where the perpendicularity is acceptable. Specifically, the perpendicularity gauge of this application is used to measure the arc-shaped bearing cage with a standard perpendicularity window 61. The fixed probe 1 and the moving probe 2 are positioned within the window 61 of the cage, maintaining a vertically aligned state. The abutment part abuts against the length measuring tool probe, and the moving probe 2 measures the distance traveled by the standard arc-shaped cage 6. The second position is the position where the perpendicularity does not meet the standard. Cases where the window 61 does not meet the perpendicularity standard can be roughly divided into cases where the window 61... There are four types of defects: wide at the bottom and narrow at the top, narrow at the top and wide at the bottom of the window hole 61, the window beam 62 tilted towards the outer ring of the bearing, and the window beam 62 tilted towards the inner ring of the bearing. In these cases, the moving probe 2 will move a certain distance, which may be greater than or less than the standard moving distance. In actual testing, a reasonable error range will be set. If the value is equal to the standard value or within the reasonable error range, it means that the verticality of the window hole 61 of the bow-shaped retainer 6 being tested meets the requirements. Otherwise, it is a defective product and will be rejected. Alternatively, an M-shaped gauge can be made to adjust the verticality of the punch hole according to the measurement to improve the yield.

[0050] As a first preferred embodiment of this application, such as Figure 1 The fixed probe 1 is a first arc plate 10 adapted to the size of the retainer window hole 61; the movable probe 2 is a second arc plate 20 adapted to the size of the retainer window hole 61, and the first arc plate 10 and the second arc plate 20 have the same shape and size.

[0051] During testing, the arc surface of the arc plate makes point or line contact with the window beams 62 on both sides of the window opening 61. When certain conditions occur, such as the window opening 61 being wider at the top and narrower at the bottom, the window opening 61 being narrower at the top and wider at the bottom, the window beams 62 tilting towards the outer ring of the bearing, or the window beams 62 tilting towards the inner ring of the bearing, the contact point between the arc plate surface of the moving probe 2 and the window beams 62 changes, causing the moving probe 2 to move. This allows for comparison with standard values, indirectly determining the verticality of the window opening 61 of the bow-shaped retainer 6 under test.

[0052] Furthermore, the first arc plate 10 is connected to the first horizontal plate 11, and the first horizontal plate 11 is connected to the first column 12; the second arc plate 20 is connected to the second horizontal plate 21, and the second horizontal plate 21 is connected to the second column 22, so that the vertical distance between the first arc plate 10 and the second arc plate 20 is adapted to the height of the window hole 61 of the retainer. The first arc plate 10, the first horizontal plate 11, the second arc plate, and the second horizontal plate 21 can be integrally formed, or they can be connected in a detachable manner. For example, a protruding plug can be provided on the first arc plate 10, and a groove adapted to the shape of the plug can be provided on the first horizontal plate to facilitate the replacement of arc plates of different sizes to adapt to retainers of different specifications. In addition, the shape of the fixed probe and the moving probe is not limited to arc shape, but can also be trapezoidal, triangular, or other symmetrical shapes with inclined surfaces.

[0053] Furthermore, by replacing the first column 12 or the second column 22 with different heights, the vertical spacing between the first arc plate 10 and the second arc plate 20 is changed, matching arc plates of different radii to adapt to the bow-shaped retainer 6 with different window opening widths and heights. In addition, the thickness of the arc plate can be adapted to the height of the vertical section at the upper or lower end of the slope surface 60 of the bow-shaped retainer 6, preventing the coexistence of tilt and verticality at different height positions of the vertical section. For example, if the arc plate only contacts the vertical section but does not actually contact the tilted section, it may be judged as qualified. However, when the thickness of the arc surface is adapted to the vertical section, it will contact the tilted section first, and the tilt can be directly determined. The vertical section in contact with the needle roller is fully covered for inspection, thereby improving the inspection accuracy.

[0054] Considering that the inspection tool of this application needs to measure the window 61 of the bow-shaped retainer 6 repeatedly, in this embodiment, the first column 12 is detachably fixed to the fixed probe 1 bracket, the second column 22 is detachably connected to the movable probe 2 bracket, the movable probe 2 bracket is set on the first slider 24, the first slider 24 is connected to the slide rail 25, the movable probe 2 bracket is connected to the reset mechanism 26, and the reset mechanism 26 enables the movable probe 2 to switch between the first position and the second position.

[0055] The specific implementation structure of the reset mechanism 26 is as follows: Figure 4 and 5The structure includes a spring 260, a limiting post 261, and a limiting plate 262. One end of the spring 260 abuts against the support of the moving probe 2, and the other end abuts against the limiting plate 262 through the limiting post 261. Considering that the measured value of the window 61 of the bow-shaped retainer 6 with unqualified verticality is actually only slightly different from the qualified value, meaning that the moving probe 2 will only move a slight distance, and in order to enable the moving probe 2 to quickly remain stationary at this position, the length of the spring 260 should not be too long. Furthermore, the limiting post 261 and the limiting plate 262 are used to limit the moving distance of the moving probe 2, preventing the spring 260 from failing to quickly cancel out the elastic potential energy through friction. The structural design is more reasonable.

[0056] As a second preferred embodiment of this application, the measuring element 3 is a dial indicator / micrometer indicator. The measuring element 3 is disposed on the measuring element mounting bracket 30. The movable probe bracket 23 is provided with an extension section 230. The movable probe bracket 23 moves so that the extension section 230 abuts against the probe of the dial indicator / micrometer indicator to display the change in the moving distance.

[0057] Considering that the perpendicularity test of the window hole 61 is a repetitive operation, in order to ensure measurement accuracy, the position and depth of the fixed probe 1 entering the window hole 61 must remain consistent each time. However, this is not easy to do manually. Therefore, the applicant envisions using a robotic arm and program-controlled placement and movement distance. However, this method is costly. Therefore, in this embodiment, a positioning plate 4 structure is set up. The center lines of the positioning plate 4, the first arc plate 10, and the second arc plate 20 are parallel. The positioning plate 4 has a notch 40, the length of which is equal to the measurement depth of the fixed probe 1 entering the cage window hole 61. To facilitate the placement of the bow-shaped bearing cage to be tested, a testing platform 5 is also included. The positioning plate 4, the first arc plate 10, and the second arc plate 20 are set on the testing platform 5. The distance between the notch 40 surface of the positioning plate 4 and the highest point of the arc of the first arc plate 10 is adapted to the outer diameter of the cage to be tested.

[0058] Specifically, the straight-line distance between the end face of the positioning plate 4 and the highest point of the arc surface of the fixed probe 1 is equal to the outer diameter of the cage to be tested. A notch 40 is made in the positioning plate 4. When the middle part of the cage window beam 62 enters the notch 40, the end of the fixed probe 1 enters the window hole 61. Setting the distance of the notch 40 can keep the distance of the fixed probe 1 entering the cage window hole 61 fixed. Therefore, the entry distance can be precisely controlled manually. The operation is simple and convenient. Of course, a robotic arm and a digital dial indicator can also be used to transmit the data of the digital dial indicator to the computer in real time for comparison with the standard value. Those skilled in the art can understand that this can achieve a fully intelligent and rapid detection method.

[0059] In order to make the inspection tool of this application adaptable to various sizes and specifications of bow-shaped retainers 6, in this embodiment, the distance between the first arc plate 10 and the second arc plate 20 and the positioning plate 4 can be adjusted to adapt to retainers of different sizes and specifications.

[0060] The specific implementation method for achieving distance adjustment is as follows:

[0061] Example 1: The first arc plate 10 and the second arc plate 20 / positioning plate 4 are disposed on the second slider 50. The second slider 50 is connected to the moving mechanism 51. The movement of the moving mechanism 51 causes the second slider 50 to move so that the first arc plate 10 and the second arc plate 20 / positioning plate 4 are relatively closer to or farther away from the positioning plate 4 / first arc plate 10 and second arc plate 20.

[0062] Specifically, such as Figure 4 Below the first horizontal plate 11, there are sequentially arranged a first column 12 and a fixed probe bracket 13. The fixed probe 1 is directly connected to the second slider 50. Below the second horizontal plate 21, there are sequentially arranged a second column 22, a movable probe bracket 23, a first slider 24, and a slide rail 25. The slide rail 25 is provided with a movable plate 513, which is located on the second slider 50. The limiting plate 262 is also located on the movable plate 513. The movable plate 513 extends out a section parallel to the extension section 230 of the movable probe bracket 23 for the installation of the measuring component mounting bracket 30. The moving mechanism 51 includes a lead screw 510, a guide rod 511, and a handle 512. Turning the handle 512 moves the second slider 50 so that the components on the second slider 50 move accordingly. Alternatively, only a positioning plate 4 can be set above the second slider 50, making the distance adjustment simple and convenient.

[0063] Example 2: The positioning plate 4 is detachably connected to the table surface of the testing table 5, so that the positioning plate 4 can move relative to the fixed probe 1 and the movable probe 2. Specifically, the positioning plate 4 is provided with an oblong hole, and the testing table 5 is provided with a positioning hole. The oblong hole and the positioning hole are connected by bolts, which can be understood by those skilled in the art.

[0064] A method for using a radial perpendicularity gauge for a bow-shaped bearing cage includes the following steps:

[0065] S1: The second slider 50 is moved by the moving mechanism 51 so that the distance between the highest point of the arc of the first arc plate 10 and the notch 40 of the positioning plate 4 is adapted to the outer diameter of the cage to be tested.

[0066] S2: Based on the height of the retainer window 61 to be tested, select appropriate first column 12 and second column 22 so that the distance between the first arc plate 10 and the second arc plate 20 is adapted to the height of the retainer window 61, ensuring that the first arc plate 10 can be tightly attached to the lower end of the retainer slope and the second arc plate 20 can be tightly attached to the upper end of the retainer pressure slope 60. At this time, the second arc plate 20 is in the second position.

[0067] S3: Zero the dial indicator, snap the middle part of the window beam 62 of the standard retainer into the notch 40 of the positioning plate 4, and let the first arc plate 10 and the second arc plate 20 enter the window hole 61 to measure the standard value of the retainer to be tested.

[0068] S4: Test the cage to be tested according to the steps in S3, record the values ​​of the dial indicator or micrometer, and compare them with the standard values. If there is an error between the values ​​and the standard values ​​and the error range is exceeded, it means that the verticality of the window hole 61 of the cage to be tested does not meet the standard.

[0069] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0070] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0071] In this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0072] The technical solutions protected by this invention are not limited to the above-described embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the scope of protection of this invention. Although the invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this invention are within the scope of protection claimed by this invention.

[0073] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A radial perpendicularity gauge for an arc-shaped bearing cage, characterized in that, include: The device includes a fixed probe, a movable probe, and a measuring element. The fixed probe is attached to the lower end of the retainer's pressure slope. The movable probe is located at the upper end of the retainer's pressure slope and can move radially along the retainer. The movable probe has a first position and a second position. When the movable probe is in the first position, the vertical projections of the fixed probe and the movable probe completely coincide. When the movable probe is in the second position, the vertical projections of the fixed probe and the movable probe partially coincide. The measuring element measures the moving distance of the movable probe to reflect the verticality of the retainer's window opening. The fixed probe is a first arc plate adapted to the size of the retainer window hole; The movable probe is a second arc plate adapted to the size of the cage window hole, and the first arc plate and the second arc plate have the same shape and size; The first arc plate is connected to the first horizontal plate, and the first horizontal plate is connected to the first vertical column; The second arc plate is connected to the second horizontal plate, and the second horizontal plate is connected to the second column, so that the vertical distance between the first arc plate and the second arc plate is adapted to the height of the window opening of the retainer; The first column is detachably fixed to the fixed probe bracket, the second column is detachably connected to the movable probe bracket, the movable probe bracket is disposed on the first slider, the first slider is connected to the slide rail, the movable probe bracket is connected to the reset mechanism, and the reset mechanism enables the movable probe to switch between the first position and the second position.

2. The radial perpendicularity gauge for an arc-shaped bearing cage according to claim 1, characterized in that, The measuring element is a dial indicator / micrometer indicator, which is mounted on a measuring element mounting bracket. The movable probe bracket has an extension section. The movable probe bracket moves so that the extension section abuts against the probe of the dial indicator / micrometer indicator to display the change in the moving distance.

3. The radial perpendicularity gauge for an arc-shaped bearing cage according to claim 1, characterized in that, It also includes a positioning plate, the center lines of the positioning plate, the first arc plate and the second arc plate are parallel, the positioning plate has a notch, the length of the notch is equal to the measurement depth of the fixed probe entering the cage window hole.

4. The radial perpendicularity gauge for an arc-shaped bearing cage according to claim 3, characterized in that, It also includes a testing platform, on which the positioning plate, the first arc plate, and the second arc plate are disposed. The distance between the notched surface of the positioning plate and the highest point of the arc of the first arc plate is adapted to the outer diameter of the cage to be tested.

5. A radial perpendicularity gauge for an arc-shaped bearing cage according to claim 4, characterized in that, The distance between the first and second arc plates and the positioning plate can be adjusted to accommodate cages of different sizes.

6. The radial perpendicularity gauge for an arc-shaped bearing cage according to claim 5, characterized in that, The first arc plate and the second arc plate / positioning plate are disposed on the second slider. The second slider is connected to a moving mechanism. The movement of the moving mechanism causes the second slider to move so that the first arc plate and the second arc plate / positioning plate are relatively closer to or farther away from the positioning plate / first arc plate and the second arc plate.

7. A method of using the radial perpendicularity gauge for the bow-shaped bearing cage as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1: The second slider is moved by the moving mechanism so that the distance between the highest point of the arc of the first arc plate and the notch surface of the positioning plate is adapted to the outer diameter of the cage to be tested. S2: Based on the height of the cage window opening to be tested, select appropriate first and second columns so that the distance between the first and second arc plates matches the height of the cage window opening, ensuring that the first arc plate can be tightly attached to the lower end of the cage slope and the second arc plate can be tightly attached to the upper end of the cage pressure slope. At this time, the second arc plate is in the second position. S3: Zero the dial indicator, snap the middle part of the window beam of the standard retainer into the notch of the positioning plate, and insert the first and second arc plates into the window opening to measure the standard value of the retainer to be tested. S4: Test the cage to be tested according to the steps in S3, record the values ​​of the dial indicator or micrometer, and compare them with the standard values. If there is an error between the values ​​and the standard values ​​and the error range is exceeded, it means that the verticality of the window hole of the cage to be tested does not meet the standard.

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