Multifunctional measuring instrument for comprehensive precision of rolling bearing

Abstract

The invention relates to the technical field of bearing measurement, and discloses a multifunctional measuring instrument for comprehensive precision of a rolling bearing. The driving device is mounted on the working platform and comprises a load block capable of axially moving and a motor assembly for driving the load block to rotate; the measuring device comprises a high-precision inductance measuring head for detecting the runout of the bearing to be measured and a pressure sensor for monitoring an axial load; the fixing device is a replaceable mandrel base and is used for supporting an inner ring or an outer ring of the bearing to be detected; wherein the driving device applies an axial load to an inner ring or an outer ring of a to-be-measured bearing through the load block and drives the to-be-measured bearing to rotate, the measuring device synchronously collects bounce and load data of the to-be-measured bearing, the brushless motor and the load block are connected through the magnetic coupling, and the centering error of the mechanical coupling is eliminated. Meanwhile, motor vibration is prevented from being transmitted to the to-be-tested bearing, the pushing force air floating shaft sleeve actively counteracts the magnetic attraction force, and the stability of the load applied to the to-be-tested bearing is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the technical field of bearing measurement technology, and more specifically, it relates to a multifunctional measuring instrument for the comprehensive accuracy of rolling bearings. Background Technology

[0002] The overall accuracy of rolling bearings includes the radial and axial runout of the inner and outer rings, as well as the protrusion. These indicators directly affect the rotational accuracy, service life, and application performance of the bearings. They are important parameters for evaluating whether finished rolling bearings are qualified. Therefore, accurate measurement of these parameters is very important.

[0003] In the existing technology, some bearing manufacturers mainly use manual measuring instruments such as the B023 type to detect the rotational accuracy of the inner and outer rings of rolling bearings. However, manual rotation measurement is prone to uneven rotation speed and human error. The indirect measurement of vibration transmitted by lever also has errors, making it unsuitable for measuring high-precision bearings.

[0004] Other bearing rotation accuracy measuring devices, such as the utility model with patent number CN216348214U, disclose a bearing rotation accuracy testing device. The coupling used in this device, which uses a motor to drive the bearing rotation, cannot eliminate the vibration during the motor rotation process, thus interfering with the accuracy of the data. Furthermore, the measuring devices mentioned above cannot measure the protrusion of rolling bearings, requiring the purchase of additional measuring equipment, which increases production costs.

[0005] In view of this, we have studied and improved the existing structure and its shortcomings, and provided a multi-functional measuring instrument for the comprehensive accuracy of rolling bearings, in order to achieve a more practical purpose. Summary of the Invention

[0006] This invention provides a multifunctional measuring instrument for the overall accuracy of rolling bearings, which overcomes the aforementioned defects in the prior art.

[0007] The purpose and effectiveness of this invention—a multifunctional measuring instrument for the overall accuracy of rolling bearings—are achieved through the following specific technical means: A multifunctional measuring instrument for the comprehensive accuracy of rolling bearings includes: a working platform; a drive unit mounted on the working platform, including an axially movable load block and a motor assembly for driving its rotation; a measuring device including a high-precision inductive measuring head for detecting the runout of the bearing under test and a pressure sensor for monitoring axial load; and a fixing device, which is a replaceable spindle base for supporting the inner or outer ring of the bearing under test; wherein the drive unit applies an axial load to the inner or outer ring of the bearing under test through the load block and drives its rotation, and the measuring device simultaneously acquires the runout and load data of the bearing under test.

[0008] In this solution, the driving device is used to accurately apply axial load to the bearing under test and drive the inner and outer rings of the bearing under test to rotate; the measuring device includes a magnetic base, a high-precision inductive measuring head and a pressure sensor, and is used to measure the overall accuracy of the bearing under test and the axial load on the bearing under test; the fixing device is a replaceable mandrel base, which is used to support one of the bottom end faces of the inner and outer rings of the bearing under test.

[0009] A further technical solution includes: a column connected to the working platform via an electric ball screw to drive the column to move radially along the bearing to be tested; an electric actuator fixed to the column, with a connecting plate fixedly mounted on the actuator slide, a brushless motor and a thrust air bearing bushing mounted on the connecting plate from top to bottom, a magnetic coupling between the brushless motor and the thrust air bearing bushing, the inner rotor of which is connected to the shaft end of the brushless motor, and the outer rotor of which is connected to the upper end of the load block passing through the inner hole of the thrust air bearing bushing.

[0010] In this solution, the electric ball screw is used to adjust the installation position of the column, thereby ensuring precise alignment between the load block and the bearing under test. The electric actuator is used to move the brushless motor and other drive devices to provide axial load. The magnetic coupling mentioned above can eliminate the alignment error caused by ordinary couplings and avoid transmitting motor vibration to the bearing under test. The electric ball screw drives the column to adjust back and forth to ensure precise alignment between the load block and the bearing under test. An electric actuator is fixed on the column to drive the load block to move up and down, adjusting the axial load on the bearing under test.

[0011] In a further technical solution, the load block is an integral structure with an annular step at its lower end for positioning the inner or outer ring of the bearing to be tested, and its upper shaft is connected to the outer rotor of the magnetic coupling; the lower end face of the thrust air-bearing bushing discharges compressed gas to generate axial thrust, which is used to counteract the magnetic attraction between the inner and outer rotors of the magnetic coupling.

[0012] In this scheme, the thin shaft portion of the load block passes through the inner hole of the thrust air bearing bushing, and the thrust air bearing bushing is fixed on the thrust air bearing bushing connecting plate. When the thrust air bearing bushing is working, its lower end face discharges compressed gas to generate axial force, thereby resisting the magnetic force between the inner and outer rotors of the magnetic coupling.

[0013] A further technical solution is that the connecting plate is divided into a dovetail groove connecting plate, a motor connecting plate, and a thrust air bearing bushing connecting plate; one side of the dovetail groove connecting plate is fixed to the actuator slider, and the other side has a dovetail tenon; one end of the motor connecting plate has a tenon that mates with the dovetail tenon for positioning, and the other end of the motor connecting plate is fixed to the brushless motor; one end of the thrust air bearing bushing connecting plate has a tenon that mates with the dovetail tenon for positioning, and the other end is fixed to the thrust air bearing bushing.

[0014] A further technical solution is that the replaceable spindle base includes: a support step for mounting a pressure sensor and supporting the bearing to be tested; and / or, the replaceable spindle base has a hollow shaft structure for avoiding the high-precision inductance measuring head used to measure the inner ring of the bearing to be tested.

[0015] In a further technical solution, the upper diameter of the replaceable spindle base is reduced to form the support step. The upper diameter of the replaceable spindle base is smaller than the inner diameter of the pressure sensor. The pressure sensor is fitted onto the upper end of the replaceable spindle base, and the support step restricts the downward movement of the pressure sensor. The inner ring of the bearing to be tested is fitted onto the upper end of the replaceable spindle base and abuts against the pressure sensor downward. The lower end face of the load block is concave to form a circular groove. The center of the circular groove is concave to form the annular step. The outer ring of the bearing to be tested is embedded in the circular groove. The annular step abuts against the upper surface of the outer ring of the bearing to be tested to provide rotational friction.

[0016] A further technical solution is that the replaceable spindle base has an upward-opening hollow structure, with the inner diameter at the opening increased to form the support step. The pressure sensor is embedded downward in the hollow structure and is restricted from moving downward by the support step. The outer ring of the bearing under test is embedded downward in the hollow structure and abuts against the pressure sensor. The lower end diameter of the load block is reduced to form the annular step. The lower end of the load block with a small diameter is embedded downward in the inner ring of the bearing under test, and the annular step abuts against the upper surface of the inner ring of the bearing under test to provide rotational friction.

[0017] In a further technical solution, the measuring device further includes: a magnetic base, two magnetic bases are installed on both sides of the working platform, and a high-precision inductance measuring head is installed on them for measuring the rotational accuracy and protrusion of the bearing under test; the high-precision inductance measuring head includes a high-precision inductance side meter for measuring the end face runout of the bearing under test and / or a high-precision measuring meter for measuring the radial runout of the bearing under test.

[0018] In this solution, a multifunctional measuring device is used to measure the end face runout, radial runout, and protrusion of the inner and outer rings of the rolling bearing.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a magnetic coupling to connect a brushless motor and a load block, eliminating the alignment error of the mechanical coupling and preventing motor vibration from being transmitted to the bearing under test, ensuring accurate and reliable runout measurement data. By setting a thrust air-bearing bushing to actively counteract the magnetic attraction, the exhaust from the lower end face of the thrust air-bearing bushing generates an axial thrust opposite to the magnetic force of the magnetic coupling, preventing the load block from axially shifting due to magnetic interference, thus significantly improving the load stability applied to the bearing under test.

[0020] The modular design of the replaceable mandrel base allows for quick replacement of mandrel bases with different positioning structures, enabling rapid switching between various testing modes for the bearing under test, including outer ring measurement, inner ring measurement, outer ring protrusion, and inner ring protrusion. This replaces multiple traditional dedicated devices, reducing equipment costs. In addition, the pressure sensor is integrated into the mandrel base support step to monitor and feedback load data in real time. Combined with the electric actuator, the pressure is automatically adjusted to avoid manual loading errors and achieve real-time closed-loop control of axial load. Attached Figure Description

[0021] Figure 1 This is a front view of a first embodiment of the bearing outer ring rotation accuracy measuring device of the present invention; Figure 2 yes Figure 1 The left view; Figure 3 This is a schematic diagram of the assembly of the magnetic coupling with other components; Figure 4 This is a schematic diagram of the fit between the load block and the bearing under test in Example 1; Figure 5 This is a front view of Embodiment 2 of the bearing inner ring rotation accuracy measuring device of the present invention; Figure 6 This is a schematic diagram of the fit between the load block and the bearing under test in Example 2; Figure 7 This refers to the calibration of the outer ring protrusion measurement gauge in Embodiment 3 of the present invention; Figure 8 This is a view of the measurement of the protrusion of the outer ring of the bearing to be tested in Embodiment 3 of the present invention; Figure 9 This is the calibration of the inner ring protrusion measurement gauge in Embodiment 4 of the present invention; Figure 10 This is a view of the measurement of the protrusion of the inner ring of the bearing to be tested in Embodiment 4 of the present invention.

[0022] Explanation of reference numerals in the attached figures: 10 Working platform, 20 Replaceable spindle base, 21 Pressure sensor, 22 Support step, 30 Magnetic base, 31 High-precision measuring instrument, 32 High-precision inductance measuring instrument, 40 Bearing under test, 50 Integrated load block, 51 Annular step, 60 Thrust air bearing sleeve, 70 Thrust air bearing sleeve connecting plate, 80 Dovetail groove connecting plate, 81 Dovetail tenon groove, 90 Magnetic coupling outer rotor, 91 Magnetic coupling inner rotor, 100 Brushless motor connecting plate, 110 Brushless motor, 120 Column, 130 Electric actuator, 131 Actuator slide, 140 Electric ball screw, 150 Reference component. Detailed Implementation

[0023] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0024] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Embodiment 1 of the present invention is a multifunctional measuring instrument for the comprehensive accuracy of rolling bearings, as follows: Figures 1 to 4 As shown, the work platform 10 is used to measure the end face runout and radial runout of the outer ring of the bearing 40 under test. The work platform 10 is subjected to quenching and tempering treatment to eliminate the internal stress of the steel and avoid deformation of the platform during use. The work platform 10 is fixed with a replaceable spindle base 20, a column 120 and an electric ball screw 140.

[0027] like Figure 1-2The working platform 10 is fixed with a column 120 and an electric ball screw 140. The bottom of the column 120 has a boss that cooperates with the positioning groove of the working platform 10. The electric ball screw 140 is bolted to the column 120 with a nut and is used to adjust the radial position of the load block on the upper end face of the bearing 40 to be tested. In this embodiment, the load block is an integral load block 50. The electric actuator 130 is fixed on the column 120. The electric actuator 130 drives the actuator slide 131 to move axially to provide the axial load required for measuring the bearing 40 to be tested. The actuator slide 131 of the electric actuator 130 is bolted to the dovetail groove connecting plate 80. The lower half of the dovetail groove connecting plate 80 is fixedly connected to the thrust air bearing bushing connecting plate 70. The thrust air bearing bushing connecting plate 70 is fitted with the thrust air bearing bushing 60. The upper half of the dovetail groove connecting plate 80 is machined with a waist-shaped groove for fixing the brushless motor connecting plate 100. A brushless motor 110 is mounted on the connecting plate 100. The dovetail connecting plate 80 is machined with a dovetail tenon 81. Tenons are machined on one side of both the brushless motor connecting plate 100 and the thrust air bearing bushing connecting plate 70. The tenons and dovetail tenons 81 are mutually engaged for positioning. The brushless motor 110 is fixed on the brushless motor connecting plate 100. The shaft end of the brushless motor 110 passes through the brushless motor connecting plate 100 and connects to the inner rotor 91 of the magnetic coupling. The outer rotor 91 of the magnetic coupling... The 0 is connected to the shaft end of the integral load block 50 that passes through the inner hole of the thrust air bearing sleeve 60. The thrust air bearing sleeve 60 is fixed to the thrust air bearing sleeve connecting plate 70 by the rubber sleeve of its outer ring. The multi-functional measuring instrument also includes a replaceable spindle base 20. The pressure sensor 21 is installed on the annular support step 22 at the upper end of the replaceable spindle base 20. The upper end face of the pressure sensor 21 contacts the lower end face of the bearing 40 under test and is used to detect the axial load on the bearing 40 under test.

[0028] like Figure 3 The brushless motor 110 drives the inner rotor 91 of the magnetic coupling, which in turn drives the outer rotor 90 of the magnetic coupling and the integrated load block 50 connected thereto to rotate, thereby driving the outer ring of the bearing 40 under test to rotate. The thrust air-bearing bushing 60 is fixed in the thrust air-bearing bushing connecting plate 70, and the inner hole of the thrust air-bearing bushing 60 mates with the shaft end of the integrated load block 50. During operation, compressed gas is generated on the lower end face of the thrust air-bearing bushing 60, forming an axial thrust that acts on the end face of the integrated load block 50 to counteract the axial magnetic force between the inner rotor 91 and the outer rotor 90 of the magnetic coupling.

[0029] The upper shaft end of the integrated load block 50 is directly connected to the outer rotor 90 of the magnetic coupling, such as... Figure 4The bottom surface of the integrated load block 50 is provided with an annular step 51 that supports and positions the upper end face of the outer ring of the bearing under test 40. The replaceable spindle base 20 has a supporting step 22 for fixing the pressure sensor 21. The upper end face of the pressure sensor 21 supports the lower end face of the bearing under test 40 and is used to measure the axial load on the bearing under test 40.

[0030] The magnetic base 30 is located on the left and right sides during the measurement of the rotational accuracy of the bearing 40 under test, and different high-precision measuring instruments are installed on them respectively. In this embodiment, the measuring instrument head includes a high-precision inductance measuring instrument 32 for measuring the end face runout of the bearing 40 under test and a high-precision measuring instrument 31 for measuring the radial runout of the bearing 40 under test.

[0031] When measuring the outer ring of the bearing 40 under test, the pressure sensor 21 is first installed on the support step 22 of the replaceable spindle base 20, and then the bearing 40 under test is installed on the upper end face of the pressure sensor 21, with a clearance fit between the bearing 40 under test and the upper shaft end of the replaceable spindle base 20. The electric ball screw 140 drives the column 120 for radial adjustment, and then the electric actuator 130 drives its actuator slide 131 to move the dovetail groove connecting plate 80 downward, so that the annular step 51 of the integrated load block 50 contacts the upper end face of the bearing 40 under test, providing the load required for measuring the radial and end face runout of the bearing 40 under test. The lower end face of the thrust air-bearing bushing 60 provides thrust to counteract the magnetic force between the inner rotor 91 and the outer rotor 90 of the magnetic coupling. Simultaneously, the brushless motor 110 drives the integrated load block 50 to rotate via the inner rotor 91 and the outer rotor 90 of the magnetic coupling. The annular step 51 utilizes friction to drive the outer ring of the bearing under test 40 to rotate. Then, the high-precision inductance meter 32 and the high-precision measuring meter 31 are adjusted to be positioned at the lower end face and outer surface of the outer ring of the bearing under test 40, respectively, to measure the end face runout and radial runout of the outer ring of the bearing under test 40, displaying the results on the inductance micrometer. When the measurement is complete, the electric actuator 130 drives the actuator slide 131 upwards to replace the bearing under test 40 and begin testing the next bearing under test 40.

[0032] Embodiment 2 of the multifunctional measuring instrument for the overall accuracy of rolling bearings in this invention, as shown below. Figures 5 to 6 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment is applicable to measuring the end face runout and radial runout of the inner ring of the bearing 40 under test. Figure 6In this embodiment, the lower end of the integrated load block 50 is provided with an annular step 51 for supporting the upper end face of the inner ring of the bearing under test 40. It forms a downward protrusion with an outer diameter smaller than the inner diameter of the bearing under test 40 and is inserted into the inner ring of the bearing under test 40 so that the annular step 51 abuts against the inner ring of the bearing under test 40 to position the bearing under test 40. The mandrel base 20 is replaceable and is provided with an annular support step 22 for supporting the positioning of the pressure sensor 21 and the outer ring of the bearing under test 40. The outer circular surface and the inner cavity of the mandrel base 20 are replaceable and are hollow to avoid the high-precision inductive side tester 32 for measuring the end face of the inner ring of the bearing under test 40 and the axial runout.

[0033] When measuring the inner ring of the bearing 40 under test, the pressure sensor 21 is first installed on the support step 22 of the replaceable spindle base 20. Then, the bearing 40 under test is installed on the upper end face of the pressure sensor 21, with a clearance fit between it and the upper annular inner hole of the replaceable spindle base 20. Then, the electric actuator 130 drives the integrated load block 50 to move down, and its lower shaft end is inserted into the inner ring of the bearing 40 under test, so that the annular step 51 is in close contact with the upper end face of the bearing 40 under test. The lower end face of the thrust air bearing sleeve 60 provides thrust to counteract the magnetic force between the inner rotor 91 and the outer rotor 90 of the magnetic coupling. At the same time, the brushless motor 110 drives the integrated load block 50 to rotate through the inner rotor 91 and the outer rotor 90 of the magnetic coupling. The friction of the contact surface of the annular step 51 drives the inner ring of the bearing 40 under test to rotate. Then, adjust the high-precision inductance meter 32 so that it is located at the lower end face of the inner ring and the inner surface of the inner ring of the bearing under test 40, respectively, and measure the end face runout and radial runout of the inner ring of the bearing under test 40.

[0034] Embodiment 3 of the multifunctional measuring instrument for the overall accuracy of rolling bearings in this invention, as shown in the example... Figures 7 to 8 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment is applicable to measuring the outer ring protrusion of the bearing 40 under test. Figure 7 When measuring the protrusion of the outer ring of the bearing 40 under test, first install the pressure sensor 21 onto the support step 22 of the replaceable spindle base 20. Then, place the reference piece 150 on the upper surface of the pressure sensor 21. Next, adjust the magnetic base 30 so that the high-precision inductive transducer 32 is located on the lower surface of the reference piece 150, adjusting the position until the transducer displays a value of 0. After removing the reference piece 150, install the bearing 40 under test into the replaceable spindle base 20, with the lower surface of the inner ring of the bearing 40 in contact with the pressure sensor 21. Figure 8The electric actuator 130 drives the integrated load block 50 to move downwards, applying an axial load perpendicular to the upper end face of the outer ring of the bearing under test 40. Simultaneously, the brushless motor 110 drives the integrated load block 50 to rotate. At this time, the high-precision inductance meter 32 measures the maximum and minimum values ​​of the protrusion of the outer ring of the bearing under test 40, using the lower end face of the outer ring as the measuring point. Then, the height difference A between the lower end face of the inner ring and the lower end face of the outer ring is measured. The bearing under test 40 is removed, and its inner ring width B and outer ring width C are measured. Thus, the relative protrusion D between the upper end face of the inner ring and the upper end face of the outer ring of the bearing under test 40 can be obtained as D = A + BC.

[0035] Embodiment four of the multifunctional measuring instrument for the overall accuracy of rolling bearings in this invention, as shown below. Figures 9 to 10 As shown, the difference between this embodiment and Embodiment Two is that this embodiment is applicable to measuring the inner ring protrusion of the bearing 40 under test. Figure 9 When measuring the inner ring protrusion of the bearing 40 under test, first install the pressure sensor 21 onto the support step of the replaceable spindle base 20. Then, place the reference piece 150 on the upper surface of the pressure sensor 21. Adjust the position of the high-precision inductive transducer 32 so that its head passes through the interior of the replaceable spindle base 20 and is located on the lower surface of the reference piece, and make the reading on the transducer 0. After removing the reference piece 150, install the bearing 40 under test into the replaceable spindle base 20, with its lower surface in contact with the pressure sensor 21 and its outer ring outer surface fitting with the spindle hole. Figure 10 The integrated load block 50 moves downward, and its lower end shaft is inserted into the inner ring of the bearing 40 under test. Its annular step 51 contacts the upper end face of the inner ring of the bearing 40 under test and applies an axial load to it. After the brushless motor 110 drives the integrated load block 50 to rotate, the high-precision inductance meter 32 uses the lower end face of the inner ring of the bearing 40 under test as the measuring point to measure the maximum and minimum values ​​of the protrusion of the inner ring of the bearing 40 under test. Then, the height difference A between the lower end face of the outer ring and the lower end face of the inner ring is measured. The bearing 40 under test is removed and its inner ring width B and outer ring width C are measured. Then, the relative protrusion D between the upper end face of the inner ring and the upper end face of the outer ring of the bearing 40 under test can be obtained as D = A + CB.

[0036] The embodiments of the present invention are given for the purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A multifunctional measuring instrument for the overall accuracy of rolling bearings, characterized in that: include: Work platform; The drive unit, mounted on the working platform, includes an axially movable load block and a motor assembly that drives its rotation. The measuring device includes a high-precision inductive measuring head for detecting the runout of the bearing under test and a pressure sensor for monitoring axial load; The fixing device is a replaceable spindle base used to support the inner or outer ring of the bearing to be tested. The driving device applies an axial load to the inner or outer ring of the bearing under test through a load block and drives it to rotate, while the measuring device simultaneously collects the runout and load data of the bearing under test.

2. The multifunctional measuring instrument for the comprehensive accuracy of rolling bearings according to claim 1, characterized in that, include: The column is connected to the working platform by an electric ball screw to drive the column to move radially along the bearing to be tested; An electric actuator is fixed on a column, and a connecting plate is fixedly installed on the actuator slide on it. A brushless motor and a thrust air bearing bush are installed on the connecting plate from top to bottom. A magnetic coupling is provided between the brushless motor and the thrust air bearing bush. The inner rotor is connected to the shaft end of the brushless motor, and the outer rotor is connected to the upper end of the load block that passes through the inner hole of the thrust air bearing bush.

3. The multifunctional measuring instrument for the comprehensive accuracy of rolling bearings according to claim 2, characterized in that, The load block is an integral structure with an annular step at its lower end for positioning the inner or outer ring of the bearing to be tested, and its upper shaft is connected to the outer rotor of the magnetic coupling. The lower end face of the thrust air bearing sleeve discharges compressed gas to generate axial thrust, which is used to counteract the magnetic attraction between the inner and outer rotors of the magnetic coupling.

4. A multifunctional measuring instrument for the comprehensive accuracy of rolling bearings according to claim 2, characterized in that, The connecting plate is divided into a dovetail groove connecting plate, a motor connecting plate, and a thrust air bearing bush connecting plate. One side of the dovetail groove connecting plate is fixed to the actuator slider, and the other side has a dovetail tenon groove; One end of the motor connecting plate has a tenon that mates with the dovetail groove for positioning, and the other end of the motor connecting plate is used to fix the brushless motor. One end of the thrust air bearing bushing connecting plate has a tenon that mates with a dovetail groove for positioning, and the other end is fixedly installed with the thrust air bearing bushing.

5. A multifunctional measuring instrument for the comprehensive accuracy of rolling bearings according to claim 3, characterized in that, The replaceable spindle base includes: Support steps are used to install pressure sensors and support the bearings under test. And / or, the replaceable spindle base has a hollow spindle structure to avoid the high-precision inductance measuring head used for measuring the inner ring of the bearing under test.

6. A multifunctional measuring instrument for the comprehensive accuracy of rolling bearings according to claim 5, characterized in that, The upper diameter of the replaceable spindle base is reduced to form the support step. The upper diameter of the replaceable spindle base is smaller than the inner diameter of the pressure sensor. The pressure sensor is fitted onto the upper end of the replaceable spindle base, and the support step restricts the downward movement of the pressure sensor. The inner ring of the bearing under test is fitted onto the upper end of the replaceable spindle base and abuts against the pressure sensor downward. The lower end face of the load block is concave to form a circular groove. The center of the circular groove is concave to form the annular step. The outer ring of the bearing under test is embedded in the circular groove. The annular step abuts against the upper surface of the outer ring of the bearing under test to provide rotational friction.

7. A multifunctional measuring instrument for the comprehensive accuracy of rolling bearings according to claim 5, characterized in that, The replaceable spindle base has an upward-opening hollow structure. The inner diameter at the opening is increased to form the support step. The pressure sensor is embedded downward in the hollow structure and is restricted from moving downward by the support step. The outer ring of the bearing under test is embedded downward in the hollow structure and abuts against the pressure sensor. The lower end diameter of the load block is reduced to form the annular step. The lower end of the load block is embedded downward in the inner ring of the bearing under test, and the annular step abuts against the upper surface of the inner ring of the bearing under test to provide rotational friction.

8. A multifunctional measuring instrument for the overall accuracy of rolling bearings according to claim 1, characterized in that, The measuring device further includes: Magnetic bases, two of which are mounted on both sides of the work platform, are equipped with high-precision inductance measuring heads for measuring the rotational accuracy and protrusion of the bearing under test. The high-precision inductance measuring head includes a high-precision inductance meter for measuring the end face runout of the bearing under test and / or a high-precision measuring meter for measuring the radial runout of the bearing under test.

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