Measuring instrument and method for detecting wall thickness and run-out of center hole of rolling body

Abstract

The invention discloses a rolling body center hole wall thickness and run-out detection measuring instrument and a detection method, and belongs to the technical field of bearing detection. A rolling body penetrates through a mandrel main body, so that the rolling body can freely roll outside an arc-shaped plate, the tip of a measuring meter is in contact with the outer diameter of the rolling body, and the highest point of the outer diameter of the rolling body is found; the rolling body is rotated by one circle, the maximum value and the minimum value of the measuring meters are recorded, the concentricity of the center line of the outer diameter circle of the rolling body and the center line of the supporting column hole is calculated through the formula that concentricity = (maximum value-minimum value) * 0.5, and the difference value of the two measuring meters on the same bus is the non-perpendicularity of the outer diameter of the rolling body and the center line of the supporting column hole in the rolling body. That is, the central axis of the outer diameter circle of the rolling body is not parallel to the central axis of the strut hole, so that the wall thickness and run-out of the central hole of the rolling body can be detected and measured, the rolling body is corrected if errors exist, and the use precision and the service life of the bearing are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing detection, and in particular relates to a measuring instrument and a detection method for the wall thickness and runout of a central hole of a rolling element. Background Art

[0002] With the rapid development of modern industry, various machines have higher and higher requirements on the precision and service life of bearings, so the requirements for various bearing tests are becoming more and more stringent; Large bearing rolling elements are in the form of support holes, and the concentricity and perpendicularity of the support holes to the outer diameter and end faces are often ignored. The concentricity and perpendicularity of the support holes to the outer diameter and end faces will directly affect the bearing's operating accuracy and service life. Therefore, it is necessary to detect and measure the wall thickness and runout of the rolling element center hole.

[0003] In view of this, a rolling element center hole wall thickness and runout detection measuring instrument and detection method are proposed to solve the above problems. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a measuring instrument and a method for detecting the wall thickness and runout of the center hole of a rolling element, which solves the problem that the rolling elements of large bearings are in the form of bearings with support holes, and the concentricity and perpendicularity of the support holes with the outer diameter and the end face are often ignored. The concentricity and perpendicularity of the support holes with the outer diameter and the end face will directly affect the use accuracy and service life of the bearing.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a rolling body center hole wall thickness and runout detection measuring instrument, comprising a base, the top of the base is fixedly connected with a long column, a long slider 1 is slidably connected to the long column, one side of the long slider 1 is fixedly connected with a long cross bar, a long slider 2 is connected to the outer surface of the long cross bar, a slide bar 1 is fixedly connected to the bottom of the long slider 2, a short column is provided on one side of the long column, the bottom end of the short column is fixedly connected to the base, a short slider 1 is connected to the outer surface of the short column, one side of the short slider 1 is fixedly connected with a short cross bar, a short slider 2 is connected to the outer surface of the short cross bar, a slide bar 2 is fixedly connected to the bottom of the short slider 2, the slide bar 1 and the slide bar 2 are respectively sleeved with slide seats, and a loading plate is connected to the slide seat; A measuring table is installed on the loading plate, and a core shaft body is provided below the measuring table. The core shaft body is arranged on one side of the base, and a limiting block is fixedly connected to the side of the core shaft body close to the base. A positioning component is provided in the limiting block, and an adjusting component is provided in the core shaft body. One end of the adjusting component passes through the core shaft body, and nuts are respectively threadedly connected on both sides outside the adjusting component. The limiting components are respectively hinged around the nuts, and the limiting components pass through the core shaft body.

[0006] As a further solution of the present invention: positioning screws are respectively provided on the long slider 1, the long slider 2, the short slider 1, the short slider 2 and the slide seat, and the two measuring tables are on the same horizontal line.

[0007] As a further solution of the present invention: the limiting assembly includes an arc plate, three through holes are opened on the arc plate, a plurality of rollers are arranged in the through holes, the inner wall of the arc plate is hinged with connecting rods through two pins, and the bottom end of the connecting rod is hinged with the nut through the pin.

[0008] As a further solution of the present invention: sliding holes are respectively opened at positions corresponding to a plurality of connecting rods outside the core shaft body, and the connecting rods are slidably connected in the sliding holes.

[0009] As a further solution of the present invention: the adjustment assembly includes a support seat, a screw rod is connected to the support seat through a sleeve, the screw rod is installed in the core shaft body, the threads on both sides of the screw rod are in opposite directions, the nut is threadedly connected to the outside of the screw rod, and one end of the screw rod passes through the core shaft body and is connected to a turntable.

[0010] As a further solution of the present invention: a slot is provided on one side of the base corresponding to the limit block, the limit block is snapped into the slot, and both the limit block and the slot are rectangular in design, a hole is provided in the limit block, and the positioning assembly is snapped into the hole.

[0011] As a further solution of the present invention: the positioning assembly includes a clamping rod, one end of the clamping rod is clamped in the clamping hole, the other end of the clamping rod passes through the base and is connected to a bearing seat, a pull plate is connected to the bearing seat, a push rod is fixed to one side of the pull plate, a spring is connected to the outer sleeve of the clamping rod, one end of the spring is fixed to one side of the base, and the other end of the spring is fixed to the clamping rod.

[0012] A detection method for a rolling element center hole wall thickness and runout detection measuring instrument, the detection method comprising the following steps: When installing the mandrel body, make the mandrel body and the side wall of the base in a vertical state, then install the two measuring gauges on the loading plate respectively, and after adjusting the position of the measuring gauges, insert the rolling body into the mandrel body, so that the support hole in the rolling body contacts the arc plate and the roller, and drive the screw rod to rotate by turning the turntable. Since the threads on both sides of the screw rod are in opposite directions, the two nuts are brought close to each other, and the two nuts push the four arc plates away from each other through the four connecting rods respectively, until the rollers on the arc plate are close to the support hole in the rolling body, so as to achieve the purpose of limiting the rolling body; After limiting the rolling body, adjust the height of the two measuring gauges so that the gauge tips are in contact with the outer diameter of the rolling body, and find the highest point of the outer diameter of the rolling body to ensure that the gauge tips of the two measuring gauges are on the same generatrix where the outer diameter of the rolling body is perpendicular to the end face. Rotate the rolling body for one circle so that the rolling body can drive multiple rollers to rotate, thereby reducing the rotational friction. Record the maximum and minimum values ​​of the measuring gauges. Calculate the concentricity of the center line of the outer diameter circle of the rolling body and the center line of the pillar hole through the formula: concentricity = (maximum value - minimum value) * 0.5. The difference between the two measuring gauges on the same generatrix is ​​the non-perpendicularity between the outer diameter of the rolling body and the center line of the pillar hole in the rolling body, that is, the non-parallelism between the center axis of the outer diameter circle of the rolling body and the center axis of the pillar hole. When the main body of the core shaft needs to be removed, the pull plate is pulled to drive the clamping rod to move so that the clamping rod is disengaged from the clamping hole on the limit block. Secondly, the pull plate is rotated to make the push rod on the pull plate face the base. Since the pull plate and the clamping rod are connected through the bearing seat, the clamping rod does not rotate during the rotation of the pull plate. Next, the pull plate is loosened, and the bearing seat and the pull plate are driven close to the base by the tension of the spring so that the push rod is in contact with the base, thereby always keeping the clamping rod and the clamping hole in a disengaged state. The main body of the core shaft is pulled so that it drives the limit block to disengage from the clamping slot and can be removed. When installing the main body of the core shaft, the limit block is inserted into the clamping slot, and the push rod is disengaged from the base by rotating the pull plate. The tension of the spring can drive the clamping rod to be clamped into the clamping hole, thereby achieving the purpose of quick installation of the main body of the core shaft.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the rolling body is limited by setting the axis body so that the core shaft body and the side wall of the base are in a vertical state. Then, two measuring gauges are respectively installed on the loading plate. After adjusting the position of the measuring gauges, the rolling body is inserted into the core shaft body so that the support hole in the rolling body contacts the arc plate and the roller. At the same time, the rolling body can roll freely outside the arc plate. The heights of the two measuring gauges are adjusted so that the tips of the measuring gauges contact the outer diameter of the rolling body, and the highest point of the outer diameter of the rolling body is found to ensure that the tips of the two measuring gauges are on the same generatrix perpendicular to the outer diameter of the rolling body and the end face. The rolling body is rotated one circle so that the rolling The body can drive multiple rollers to rotate, thereby reducing the rotational friction, and record the maximum and minimum values ​​of the measuring table. The concentricity of the center line of the outer diameter circle of the rolling element and the center line of the support hole is calculated through the formula: Concentricity = (maximum value-minimum value)*0.5. The difference between the two measuring tables on the same generatrix is ​​the non-perpendicularity between the outer diameter of the rolling element and the center line of the support hole in the rolling element, that is, the non-parallelism between the center axis of the outer diameter circle of the rolling element and the center axis of the support hole. Therefore, the wall thickness and runout of the center hole of the rolling element can be detected and measured. If there is an error, the rolling element will be processed and corrected to ensure the use accuracy and service life of the bearing.

[0014] In the present invention, four arc plates are set to limit the rolling body. When adjusting the position of the arc plate, the screw rod is driven to rotate by rotating the turntable. Since the threads on the two sides outside the screw rod are in opposite directions, the two nuts are brought close to each other, and the two nuts push the four arc plates away from each other through four connecting rods respectively until the rollers on the arc plates are close to the support holes in the rolling body, thereby achieving the purpose of limiting the rolling body. Similarly, the turntable is reversed to make the two nuts move away from each other and the four arc plates can be brought close to each other. Therefore, the requirements for supporting and limiting rolling bodies of different specifications can be met, and there is no need to frequently replace the core shaft bodies of different specifications, which is conducive to efficient and stable detection of rolling bodies.

[0015] The present invention drives the clamping rod to move by pulling the pull plate, so that the clamping rod is disengaged from the clamping hole on the limit block, and then rotates the pull plate to make the push rod on the pull plate face the base. Since the pull plate and the clamping rod are connected by the bearing seat, the clamping rod does not rotate during the rotation of the pull plate, and then releases the pull plate, and the bearing seat and the pull plate are driven close to the base by the tension of the spring, so that the push rod is in contact with the base, thereby being able to always keep the clamping rod and the clamping hole in a disengaged state, and pulling the main body of the spindle to drive the limit block to disengage from the clamping slot to remove it. When installing the main body of the spindle, the limit block is inserted into the clamping slot, and the push rod is disengaged from the base by rotating the pull plate. The tension of the spring can drive the clamping rod to be clamped into the clamping hole, so as to achieve the purpose of quickly installing the main body of the spindle. Therefore, the traditional method of installing the main body of the spindle on the base by using threads is abandoned, and the convenience of disassembling and assembling the main body of the spindle is improved, which is beneficial to the replacement of the main body of the spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic structural diagram of the side view of the present invention; Figure 3 It is a structural schematic diagram of the cross section of the base of the present invention; Figure 4 It is a structural schematic diagram of the cross section of the mandrel body of the present invention; Figure 5 It is a structural schematic diagram of the limiting assembly of the present invention; Figure 6 It is a structural schematic diagram of the positioning assembly of the present invention; In the figure: 1, base; 2, long column; 3, long slider 1; 4, long cross bar; 5, long slider 2; 6, slide bar 1; 7, short column; 8, short slider 1; 9, short cross bar; 10, short slider 2; 11, slide bar 2; 12, slide seat; 13, loading plate; 14, measuring table; 15, spindle body; 16, limit assembly; 161, arc plate; 162, through hole; 163, roller; 164, connecting rod; 17, nut; 18, adjustment assembly; 181, support seat; 182, lead screw; 183, turntable; 19, sliding hole; 20, limit block; 21, slot; 22, slot; 23, positioning assembly; 231, clamping rod; 232, bearing seat; 233, pull plate; 234, spring; 235, push rod. Implementation

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-6 The present invention provides a technical solution for a measuring instrument and a method for detecting the wall thickness and runout of a rolling element center hole: Example

[0019] according to Figure 1-6 As shown, a measuring instrument for detecting the wall thickness and runout of a center hole of a rolling element comprises a base 1, a long column 2 is fixedly connected to the top of the base 1, a long slider 1 3 is slidably connected to the long column 2, a long cross bar 4 is fixedly connected to one side of the long slider 1 3, a long slider 2 5 is connected to the outer sleeve of the long cross bar 4, a slide bar 1 6 is fixedly connected to the bottom of the long slider 2 5, a short column 7 is provided on one side of the long column 2, the bottom end of the short column 7 is fixedly connected to the base 1, a short slider 1 8 is connected to the outer sleeve of the short column 7, a short cross bar 9 is fixedly connected to one side of the short slider 1 8, a short cross bar 9 is connected to the outer sleeve of the short slider 2 10, a slide bar 2 11 is fixedly connected to the bottom of the short slider 2 10, a slide seat 12 is respectively sleeved on the outside of the slide bar 1 6 and the slide bar 2 11, a loading plate 13 is connected to the slide seat 12, positioning screws are respectively provided on the long slider 1 3, the long slider 2 5, the short slider 1 8, the short slider 2 10 and the slide seat 12, and two measuring gauges 14 are on the same horizontal line; A measuring table 14 is installed on the loading plate 13, and a spindle body 15 is provided below the measuring table 14. The spindle body 15 is arranged on one side of the base 1, and a side of the spindle body 15 close to the base 1 is fixedly connected to a limit block 20, and a positioning assembly 23 is provided in the limit block 20. The positioning assembly 23 includes a clamping rod 231, one end of the clamping rod 231 is clamped in the clamping hole 22, and the other end of the clamping rod 231 passes through the base 1 and is connected to a bearing seat 232. Since the pull plate 233 is connected to the clamping rod 231 through the bearing seat 232, the clamping rod 231 does not rotate during the rotation of the pull plate 233; The bearing seat 232 is connected with a pull plate 233, and a push rod 235 is fixed on one side of the pull plate 233. The bearing seat 232 and the pull plate 233 are driven close to the base 1 by the pulling force of the spring 234, so that the push rod 235 is in contact with the base 1, so that the clamping rod 231 and the clamping hole 22 are always kept in a disengaged state. The mandrel body 15 is pulled to drive the limit block 20 to disengage from the clamping groove 21, so that it can be removed, thereby improving the convenience of disassembling the mandrel body 15; The clamping rod 231 is outer-mounted with a spring 234, one end of the spring 234 is fixed to one side of the base 1, and the other end of the spring 234 is fixed to the clamping rod 231. The pulling force of the spring 234 can drive the clamping rod 231 to be clamped into the clamping hole 22, thereby achieving the purpose of quickly positioning the core shaft body 15.

[0020] An adjustment assembly 18 is provided in the mandrel body 15. The adjustment assembly 18 includes a support seat 181. A screw rod 182 is connected to the support seat 181 through a sleeve. The screw rod 182 is installed in the mandrel body 15. The threads on both sides of the screw rod 182 are in opposite directions. The nut 17 is threadedly connected to the outside of the screw rod 182. One end of the screw rod 182 passes through the mandrel body 15 and is connected to a turntable 183. Since the threads on both sides of the screw rod 182 are in opposite directions, the two nuts 17 can approach or move away from each other during the rotation of the screw rod 182, so as to facilitate the synchronous adjustment of the four arc plates 161. A slot 21 is provided on one side of the base 1 corresponding to the limit block 20, and the limit block 20 is snapped into the slot 21, and both the limit block 20 and the slot 21 are rectangular in design. A hole 22 is provided in the limit block 20, and the positioning component 23 is snapped into the hole 22. Because the limit block 20 and the slot 21 are both rectangular in design, the core shaft body 15 will not deviate from the angle after installation, thereby improving the installation stability and facilitating high-precision detection of the rolling body.

[0021] One end of the adjustment component 18 passes through the mandrel body 15, and nuts 17 are respectively threadedly connected on both sides of the adjustment component 18; The nut 17 is hinged around the limiting assembly 16, which includes an arc plate 161, and three through holes 162 are formed on the arc plate 161. A plurality of rollers 163 are provided in the through holes 162. The inner wall of the arc plate 161 is hinged with connecting rods 164 through two pins. The bottom end of the connecting rod 164 is hinged to the nut 17 through the pin. Since the rollers 163 are provided, the support holes in the rolling body are in contact with the arc plate 161 and the rollers 163. At the same time, the rolling body can roll freely outside the arc plate 161, thereby reducing the rotational friction. The limiting assembly 16 passes through the core shaft body 15, and sliding holes 19 are respectively opened at the positions corresponding to the plurality of connecting rods 164 on the outside of the core shaft body 15. The connecting rods 164 are slidably connected in the sliding holes 19. Due to the provision of the sliding holes 19, the sliding holes 19 play a role in limiting the connecting rods 164, thereby preventing the connecting rods 164 from deviating at an angle and affecting the stability of the arc plate 161 in supporting and limiting the rolling body. Example

[0022] The detection method of the rolling element center hole wall thickness and runout detection measuring instrument comprises the following steps: S1. When installing the mandrel body 15, make the mandrel body 15 and the side wall of the base 1 in a vertical state. Then, install the two measuring gauges 14 on the loading plate 13 respectively. After adjusting the position of the measuring gauges 14, insert the rolling body into the mandrel body 15 so that the support hole in the rolling body contacts the arc plate 161 and the roller 163. The screw rod 182 is driven to rotate by rotating the turntable 183. Since the threads on both sides of the screw rod 182 are in opposite directions, the two nuts 17 are brought close to each other. The two nuts 17 push the four arc plates 161 away from each other through the four connecting rods 164 respectively until the rollers 163 on the arc plate 161 are close to the support hole in the rolling body, so as to achieve the purpose of limiting the rolling body. S2. After limiting the rolling body, adjust the height of the two measuring gauges 14 so that the tip of the measuring gauge 14 contacts the outer diameter of the rolling body, and find the highest point of the outer diameter of the rolling body to ensure that the tips of the two measuring gauges 14 are on the same generatrix perpendicular to the outer diameter of the rolling body and the end face. Rotate the rolling body for one circle so that the rolling body can drive multiple rollers 163 to rotate, thereby reducing the rotational friction. Record the maximum and minimum values ​​of the measuring gauge 14, and calculate the concentricity of the center line of the outer diameter circle of the rolling body and the center line of the support hole by the formula: concentricity = (maximum value - minimum value) * 0.5. The difference between the two measuring gauges 14 on the same generatrix is ​​the non-perpendicularity between the outer diameter of the rolling body and the center line of the support hole in the rolling body, that is, the non-parallelism between the center axis of the outer diameter circle of the rolling body and the center axis of the support hole. S3. When the mandrel body 15 needs to be removed, the pull plate 233 is pulled to drive the clamping rod 231 to move so that the clamping rod 231 is disengaged from the clamping hole 22 on the limit block 20. Then, the pull plate 233 is rotated so that the top rod 235 on the pull plate 233 faces the base 1. Since the pull plate 233 and the clamping rod 231 are connected through the bearing seat 232, the clamping rod 231 does not rotate during the rotation of the pull plate 233. Then, the pull plate 233 is released, and the bearing seat 232 and the pull plate 233 are driven to close together by the pulling force of the spring 234. Close to the base 1, make the push rod 235 contact with the base 1, so that the clamping rod 231 and the clamping hole 22 can always be kept in a disengaged state, pull the core shaft body 15 to drive the limit block 20 to disengage from the clamping slot 21, and then remove it. When installing the core shaft body 15, insert the limit block 20 into the clamping slot 21, and make the push rod 235 disengage from the base 1 by rotating the pull plate 233. The pulling force of the spring 234 can drive the clamping rod 231 to be clamped into the clamping hole 22, so as to achieve the purpose of quickly installing the core shaft body 15.

[0023] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. A rolling element center hole wall thickness and runout detection and measuring instrument, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a long column (2), a long slider (3) is slidably connected to the long column (2), a long cross bar (4) is fixedly connected to one side of the long slider (3), a long slider (5) is connected to the outer sleeve of the long cross bar (4), a slide bar (6) is fixedly connected to the bottom of the long slider (5), a short column (7) is provided on one side of the long column (2), the bottom end of the short column (7) is fixedly connected to the base (1), a short slider (8) is connected to the outer sleeve of the short column (7), a short slider (10) is fixedly connected to one side of the short slider (8), a short cross bar (9) is fixedly connected to the outer sleeve of the short cross bar (9), a short slider (10) is connected to the outer sleeve of the short cross bar (9), a slide bar (11) is fixedly connected to the bottom of the short slider (10), a slide seat (12) is respectively connected to the outer sleeve of the slide seat (12), and a loading plate (13) is connected to the slide seat (12); A measuring gauge (14) is mounted on the loading plate (13), a spindle body (15) is disposed below the measuring gauge (14), the spindle body (15) is disposed on one side of the base (1), a side of the spindle body (15) close to the base (1) is fixedly connected to a limit block (20), a positioning assembly (23) is disposed in the limit block (20), an adjustment assembly (18) is disposed in the spindle body (15), one end of the adjustment assembly (18) passes through the spindle body (15), nuts (17) are respectively threadedly connected on two sides of the outside of the adjustment assembly (18), the nut (17) is respectively hingedly connected to the limit assembly (16) around the nut (17), and the limit assembly (16) passes through the spindle body (15).

2. The rolling element center hole wall thickness and runout detection and measuring instrument according to claim 1, characterized in that: Positioning screws are respectively provided on the long slider 1 (3), the long slider 2 (5), the short slider 1 (8), the short slider 2 (10) and the slide seat (12), and the two measuring gauges (14) are located on the same horizontal line.

3. The rolling element center hole wall thickness and runout detection and measuring instrument according to claim 1, characterized in that: The limit assembly (16) comprises an arc-shaped plate (161), three through holes (162) are formed on the arc-shaped plate (161), a plurality of rollers (163) are arranged in the through holes (162), the inner wall of the arc-shaped plate (161) is hinged with connecting rods (164) via two pins, and the bottom end of the connecting rod (164) is hinged with a nut (17) via a pin.

4. The rolling element center hole wall thickness and runout detection and measuring instrument according to claim 3 is characterized in that: Sliding holes (19) are respectively provided at positions outside the core shaft body (15) corresponding to a plurality of connecting rods (164), and the connecting rods (164) are slidably connected in the sliding holes (19).

5. The rolling element center hole wall thickness and runout detection and measuring instrument according to claim 1, characterized in that: The adjustment assembly (18) comprises a support seat (181), a screw rod (182) is connected to the support seat (181) via a shaft sleeve, the screw rod (182) is installed in the spindle body (15), the threads on both sides of the screw rod (182) are in opposite directions, the nut (17) is threadedly connected to the outside of the screw rod (182), and one end of the screw rod (182) passes through the spindle body (15) and is connected to a rotating disk (183).

6. The rolling element center hole wall thickness and runout detection and measuring instrument according to claim 1, characterized in that: A slot (21) is provided on one side of the base (1) corresponding to the limit block (20), the limit block (20) is snapped into the slot (21), and both the limit block (20) and the slot (21) are rectangular in design. A slot (22) is provided in the limit block (20), and the positioning assembly (23) is snapped into the slot (22).

7. The rolling element center hole wall thickness and runout detection and measuring instrument according to claim 6, characterized in that: The positioning assembly (23) comprises a clamping rod (231), one end of which is clamped in the clamping hole (22), the other end of which passes through the base (1) and is connected to a bearing seat (232), a pull plate (233) is connected to the bearing seat (232), a push rod (235) is fixed to one side of the pull plate (233), a spring (234) is connected to the outer sleeve of the clamping rod (231), one end of which is fixed to one side of the base (1), and the other end of which is fixed to the clamping rod (231).

8. A method for detecting the wall thickness and runout of a rolling element center hole by a measuring instrument for detecting the wall thickness and runout of a rolling element center hole according to any one of claims 1 to 7, characterized in that: The detection method comprises the following steps: When installing the mandrel body (15), the mandrel body (15) and the side wall of the base (1) are in a vertical state. Then, the two measuring gauges (14) are respectively installed on the loading plate (13). After adjusting the position of the measuring gauges (14), the rolling body is inserted into the mandrel body (15) so that the support hole in the rolling body contacts the arc plate (161) and the roller (163). The screw rod (182) is driven to rotate by rotating the turntable (183). Since the threads on the two sides of the screw rod (182) are in opposite directions, the two nuts (17) are brought closer to each other. The two nuts (17) push the four arc plates (161) away from each other through the four connecting rods (164) until the rollers (163) on the arc plates (161) are closely attached to the support hole in the rolling body, thereby achieving the purpose of limiting the position of the rolling body. After limiting the rolling body, the heights of the two measuring gauges (14) are adjusted so that the gauge tips of the measuring gauges (14) contact the outer diameter of the rolling body, and the highest point of the outer diameter of the rolling body is found to ensure that the gauge tips of the two measuring gauges (14) are on the same generatrix perpendicular to the outer diameter of the rolling body and the end face. The rolling body is rotated for one circle so that the rolling body can drive the multiple rollers (163) to rotate, thereby reducing the rotational friction. The maximum and minimum values ​​of the measuring gauges (14) are recorded, and the concentricity of the center line of the outer diameter circle of the rolling body and the center line of the support hole is calculated by the formula: concentricity = (maximum value - minimum value) * 0.

5. The difference between the two measuring gauges (14) on the same generatrix is ​​the non-perpendicularity between the outer diameter of the rolling body and the center line of the support hole in the rolling body, that is, the non-parallelism between the center axis of the outer diameter circle of the rolling body and the center axis of the support hole. When the mandrel body (15) needs to be removed, the pull plate (233) is pulled to drive the clamping rod (231) to move, so that the clamping rod (231) is disengaged from the clamping hole (22) on the limit block (20), and then the pull plate (233) is rotated to make the top rod (235) on the pull plate (233) face the base (1). Since the pull plate (233) and the clamping rod (231) are connected via the bearing seat (232), the clamping rod (231) does not rotate during the rotation of the pull plate (233). Then, the pull plate (233) is released, and the bearing seat (232) and the pull plate (233) are driven close to each other by the pulling force of the spring (234). The base (1) is provided so that the push rod (235) contacts the base (1), thereby being able to always keep the clamping rod (231) and the clamping hole (22) in a disengaged state. The mandrel body (15) is pulled to drive the limit block (20) to disengage from the clamping slot (21), and the mandrel body (15) can be removed. When installing the mandrel body (15), the limit block (20) is inserted into the clamping slot (21), and the push rod (235) is disengaged from the base (1) by rotating the pull plate (233). The clamping rod (231) can be driven to clamp into the clamping hole (22) by the pulling force of the spring (234), thereby achieving the purpose of quickly installing the mandrel body (15).

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