Multifunctional measuring instrument for comprehensive precision of rolling bearing

Abstract

The application relates to the technical field of bearing measurement, and discloses a multifunctional measuring instrument for comprehensive precision of a rolling bearing, which comprises a workbench, a driving device installed on the workbench, a measuring device, and a fixing device. The driving device comprises an axially movable load block and a motor assembly for driving the rotation of the load block. The measuring device comprises a high-precision inductance measuring head for detecting the runout of a bearing to be measured and a pressure sensor for monitoring the axial load. The fixing device is a replaceable mandrel base for supporting the inner ring or the outer ring of the bearing to be measured. The driving device applies an axial load to the inner ring or the outer ring of the bearing to be measured through the load block and drives the rotation of the inner ring or the outer ring. The measuring device synchronously collects the runout and load data of the bearing to be measured. A magnetic coupling is used to connect the brushless motor and the load block, so that the centering error of the mechanical coupling is eliminated, the transmission of the motor vibration to the bearing to be measured is blocked, the thrust air float shaft sleeve actively offsets the magnetic attraction force, and the stability of the load applied to the bearing to be measured is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bearing measurement technology, more specifically, relates to a multifunctional measuring instrument for comprehensive precision of rolling bearing. BACKGROUND

[0002] The comprehensive precision of rolling bearing includes the radial and end face runout of the inner ring and the outer ring, and the convexity, which directly affects the rotation precision, service life and application effect of the bearing, and is an important parameter for measuring whether the finished rolling bearing is qualified. Therefore, accurate measurement of the above parameters is very important.

[0003] In the prior art, some bearing manufacturers mainly use B023 type and other manual type measuring instruments to detect the rotation precision of the inner and outer rings of the rolling bearing. However, manual rotation measurement is prone to uneven rotation speed and human error, and the indirect measurement of lever transmission vibration also has errors, which is not suitable for measuring high-precision bearings.

[0004] In addition, some bearing rotation precision measurement devices, such as the utility model with patent number CN216348214U, disclose a bearing rotation precision detection device. The coupling used for driving the bearing to rotate by the motor cannot eliminate the vibration during the rotation of the motor, thereby interfering with the accuracy of the data. Moreover, the above-mentioned measurement devices cannot measure the convexity of the rolling bearing, and additional measurement devices need to be purchased for measurement, which increases the production cost.

[0005] Therefore, the existing structure and defects are improved, and a multifunctional measuring instrument for comprehensive precision of rolling bearing is provided to achieve a more practical purpose. SUMMARY

[0006] The present application provides a multifunctional measuring instrument for comprehensive precision of rolling bearing to overcome the above-mentioned defects in the prior art.

[0007] The purpose and effect of the multifunctional measuring instrument for comprehensive precision of rolling bearing are achieved by the following specific technical means:

[0008] A multifunctional measuring instrument for comprehensive precision of rolling bearing, comprising: a workbench; a driving device installed on the workbench, comprising an axially movable load block and a motor assembly driving the rotation thereof; a measuring device comprising a high-precision inductance measuring head for detecting the runout of the bearing to be measured and a pressure sensor for monitoring the axial load; a fixing device, which is a replaceable mandrel base, for supporting the inner ring or outer ring of the bearing to be measured; wherein the driving device applies an axial load to the inner ring or outer ring of the bearing to be measured through the load block and drives the rotation thereof, and the measuring device synchronously collects the runout and load data of the bearing to be measured.

[0009] In the present scheme, the driving device is used to precisely apply axial load to the bearing to be tested and drive the inner and outer rings of the bearing to be tested to rotate; the measuring device comprises a magnetic table stand, a high-precision inductance measuring head and a pressure sensor, and is used to measure the comprehensive precision of the bearing to be tested and the axial load borne by the bearing to be tested; 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 to be tested.

[0010] Further technical solutions also include: a column connected to the working platform by an electric ball screw to drive the column to move along the radial direction of the bearing to be tested; an electric actuator fixed to the column, a connection plate fixedly arranged on the actuator sliding table of the electric actuator, a brushless motor and a thrust gas floating shaft sleeve mounted on the connection plate from top to bottom, a magnetic coupling arranged between the brushless motor and the thrust gas floating shaft sleeve, an inner rotor of the magnetic coupling connected to a shaft end of the brushless motor, and an outer rotor of the magnetic coupling connected to an upper end of a load block passing through a hole of the thrust gas floating shaft sleeve.

[0011] In the present scheme, the electric ball screw is used to adjust the mounting position of the column, so that the load block precisely matches the bearing to be tested, the electric actuator is used to move the driving device such as the brushless motor to provide axial load, the magnetic coupling can eliminate the centering error caused by the ordinary coupling, and at the same time, the vibration of the motor is avoided from being transmitted to the bearing to be tested, the electric ball screw drives the column to adjust forward and backward, so as to ensure that the load block precisely matches the bearing to be tested, and the electric actuator fixed to the column is used to drive the load block to move up and down, so as to adjust the axial load borne by the bearing to be tested.

[0012] Further technical solutions, the load block is of an integrated structure, the lower end of the load block is provided with an annular step for positioning the inner ring or the outer ring of the bearing to be tested, and the upper end shaft of the load block is connected to the outer rotor of the magnetic coupling; the lower end surface of the thrust gas floating shaft sleeve discharges compressed gas to generate axial thrust, which is used to offset the magnetic attraction force between the inner and outer rotors of the magnetic coupling.

[0013] In the present scheme, the thin shaft part of the load block passes through the inner hole of the thrust gas floating shaft sleeve, the thrust gas floating shaft sleeve is fixed on the thrust gas floating shaft sleeve connection plate, and when the thrust gas floating shaft sleeve works, the lower end surface of the thrust gas floating shaft sleeve discharges compressed gas to generate axial force, so as to resist the magnetic force between the inner and outer rotors of the magnetic coupling.

[0014] Further technical solutions, the connecting plate is divided into dovetail groove connecting plate, motor connecting plate and thrust gas bearing shaft sleeve connecting plate; one side of the dovetail groove connecting plate is fixed with the actuator slider, and the other side is provided with a dovetail groove; one end of the motor connecting plate is provided with a tenon matched with the dovetail groove for positioning, and the other end of the motor connecting plate is fixed with the brushless motor; one end of the thrust gas bearing shaft sleeve connecting plate is provided with a tenon matched with the dovetail groove for positioning, and the other end of the thrust gas bearing shaft sleeve connecting plate is fixedly installed with the thrust gas bearing shaft sleeve.

[0015] Further technical solutions, the replaceable mandrel base comprises: a support step for installing a pressure sensor and supporting a bearing to be measured; and / or the replaceable mandrel base has a hollow shaft structure for avoiding a high-precision inductance measuring head measuring an inner ring of the bearing to be measured.

[0016] Further technical solutions, the upper end of the replaceable mandrel base is reduced in diameter to form the support step, the diameter of the upper end of the replaceable mandrel base is smaller than the inner diameter of the pressure sensor, the pressure sensor is sleeved on the upper end of the replaceable mandrel base, and the support step limits the downward movement of the pressure sensor, the inner ring of the bearing to be measured is sleeved on the upper end of the replaceable mandrel base and abuts against the pressure sensor downward, the lower end surface 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 measured is embedded in the circular groove, and the annular step abuts against the upper surface of the outer ring of the bearing to be measured to provide rotational friction.

[0017] Further technical solutions, the replaceable mandrel base has a hollow structure with an opening upward, the inner diameter at the opening is increased to form the support step, the pressure sensor is embedded in the hollow structure downward and is limited to move downward by the support step, the outer ring of the bearing to be measured is embedded in the hollow structure downward and abuts against the pressure sensor, the lower end of the load block is reduced in diameter to form the annular step, and the small-diameter lower end of the load block is embedded in the inner ring of the bearing to be measured downward and makes the annular step abut against the upper surface of the inner ring of the bearing to be measured to provide rotational friction.

[0018] Further technical solutions, the measuring device further comprises: two magnetic bases installed on both sides of the working platform, and a high-precision inductance measuring head installed thereon, for measuring the rotation accuracy and protrusion of the bearing to be measured; the high-precision inductance measuring head comprises a high-precision inductance side measuring base for measuring the end face runout of the bearing to be measured and / or a high-precision measuring base for measuring the radial runout of the bearing to be measured.

[0019] In the present solution, the use of the multifunctional measuring device can measure the end face runout, radial runout and protrusion of the inner and outer rings of the rolling bearing.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The present application adopts a magnetic coupling to connect the brushless motor and the load block, eliminates the centering error of the mechanical coupling, simultaneously blocks the transmission of motor vibration to the bearing to be measured, ensures the accuracy and reliability of the runout measurement data, sets the thrust air-floating shaft sleeve to actively offset the magnetic attraction force, the lower end surface of the thrust air-floating shaft sleeve exhausts to generate an axial thrust in the opposite direction of the magnetic force of the magnetic coupling, avoids the axial deviation of the load block caused by the magnetic force interference, and significantly improves the stability of the load applied to the bearing to be measured.

[0022] Through the modular design of the replaceable mandrel base, the replaceable mandrel base with different positioning structures can be quickly replaced, various test modes such as outer ring measurement, inner ring measurement, outer ring protrusion, and inner ring protrusion of the bearing to be measured are realized, the traditional multiple special-purpose equipment is replaced, the equipment cost is reduced, in addition, the pressure sensor is integrated on the mandrel base support step, the load data is monitored and fed back in real time, the pressure is automatically adjusted in combination with the electric actuator, the manual loading error is avoided, and the real-time closed-loop control of the axial load is realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the front view of the bearing outer ring rotation precision measurement device in the present application;

[0024] Figure 2 is the left view of Figure 1 ;

[0025] Figure 3 is the assembly schematic view of the magnetic coupling and other components;

[0026] Figure 4 is the cooperation state schematic view of the load block and the bearing to be measured in the embodiment one;

[0027] Figure 5 is the front view of the bearing inner ring rotation precision measurement device in the present application;

[0028] Figure 6 is the cooperation state schematic view of the load block and the bearing to be measured in the embodiment two;

[0029] Figure 7 is the calibration of the outer ring protrusion measurement table in the embodiment three of the present application;

[0030] Figure 8 is the view of the outer ring protrusion measurement of the bearing to be measured in the embodiment three of the present application;

[0031] Figure 9 is the calibration of the inner ring protrusion measurement table in the embodiment four of the present application;

[0032] Figure 10It is the view of the protruding amount measurement of the inner ring of the bearing to be measured in the fourth embodiment of the present application.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 10 working platform, 20 replaceable mandrel base, 21 pressure sensor, 22 support step, 30 magnetic table seat, 31 high-precision measuring table, 32 high-precision inductance measuring table, 40 bearing to be measured, 50 integral load block, 51 annular step, 60 thrust gas bearing sleeve, 70 thrust gas bearing sleeve connecting plate, 80 dovetail groove connecting plate, 81 dovetail 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 element. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples, and the following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0036] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application, in addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] An embodiment of a multifunctional measuring instrument for comprehensive precision of a rolling bearing according to the present application is shown in Figures 1-4 As shown, it is used for measuring the end face runout and radial runout of the outer ring of the bearing to be measured 40, the working platform 10 adopts quenching and normalizing treatment to eliminate the internal stress of the steel material and avoid deformation of the platform during use, and the replaceable mandrel base 20, the column 120 and the electric ball screw 140 are fixed on the working platform 10.

[0039] As Figures 1-2 , the working platform 10 is fixed with a column 120 and a motorized ball screw 140, the bottom of the column 120 has a boss matched with the positioning slot of the working platform 10, the motorized ball screw 140 is bolted with the column 120 through a nut, used to adjust the radial position of the load block on the end surface of the bearing 40 to be measured, in this embodiment, the load block adopts an integrated load block 50, an electric actuator 130 is fixed on the column 120, the electric actuator 130 drives the actuator slide 131 to move axially to provide the required axial load for measuring the bearing 40 to be measured, the actuator slide 131 of the electric actuator 130 is fixed by bolt connection with the dovetail groove connecting plate 80, the lower half of the dovetail groove connecting plate 80 is fixedly connected with the thrust gas bearing sleeve connecting plate 70, the thrust gas bearing sleeve connecting plate 70 is matched with the installation of the thrust gas bearing sleeve 60, the upper half of the dovetail groove connecting plate 80 is processed with a waist-shaped groove, used to fix the brushless motor connecting plate 100, the brushless motor connecting plate 100 is matched with the installation of the brushless motor 110, the dovetail groove connecting plate 80 is processed with a dovetail groove 81, the brushless motor connecting plate 100 and the thrust gas bearing sleeve connecting plate 70 are processed with a tenon on one side, the tenon is matched with the dovetail groove 81 for positioning, the brushless motor 110 is fixed on the brushless motor connecting plate 100, the shaft end of the brushless motor 110 is connected with the inner rotor 91 of the magnetic coupling through the brushless motor connecting plate 100, and the outer rotor 90 of the magnetic coupling is matched with the shaft end of the integrated load block 50 passing through the inner hole of the thrust gas bearing sleeve 60, the thrust gas bearing sleeve 60 is fixed on the thrust gas bearing sleeve connecting plate 70 through the rubber sleeve of its outer ring, the multifunctional measuring instrument also includes a replaceable mandrel base 20, the annular support step 22 on the upper end of the replaceable mandrel base 20 is installed with a pressure sensor 21, the upper end surface of the pressure sensor 21 is in contact with the lower end surface of the bearing 40 to be measured, used to detect the axial load of the bearing 40 to be measured.

[0040] As Figure 3 , the brushless motor 110 drives the magnetic coupling inner rotor 91, drives the magnetic coupling outer rotor 90 and the integrated load block 50 connected therewith to rotate, thereby driving the outer ring of the bearing 40 to be measured to rotate, the thrust gas bearing sleeve 60 is fixed in the thrust gas bearing sleeve connecting plate 70, the inner hole of the thrust gas bearing sleeve 60 is matched with the shaft end of the integrated load block 50. When working, the lower end surface of the thrust gas bearing sleeve 60 generates compressed gas, forming an axial thrust acting on the end surface of the integrated load block 50, used to offset the axial magnetic force between the magnetic coupling inner rotor 91 and the magnetic coupling outer rotor 90.

[0041] The upper shaft end of the integrated load block 50 is directly connected with the magnetic coupling outer rotor 90, 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.

[0042] 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.

[0043] 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.

[0044] Embodiment 2 of the multifunctional measuring instrument for the overall accuracy of rolling bearings in this invention, as shown below. Figures 5-6 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 6The lower end of the integrated load block 50 in the embodiment is provided with an annular step 51 for supporting the upper end surface of the inner ring of the bearing to be measured 40, which is protruded downward and inserted into the inner ring of the bearing to be measured 40, so that the annular step 51 abuts against the inner ring of the bearing to be measured 40 to position the bearing to be measured 40. The replaceable mandrel base 20 is provided with an annular support step 22 for supporting the pressure sensor 21 and the outer ring of the bearing to be measured 40, and the middle outer surface of the replaceable mandrel base 20 is hollowed to avoid the high-precision inductance measuring table 32 for measuring the end surface and axial runout of the inner ring of the bearing to be measured 40.

[0045] When measuring the inner ring of the bearing to be measured 40, the pressure sensor 21 is first installed on the support step 22 of the replaceable mandrel base 20, and then the bearing to be measured 40 is installed on the upper end surface of the pressure sensor 21 and cooperates with the annular gap of the upper end annular hole of the replaceable mandrel base 20. Then the electric actuator 130 drives the integrated load block 50 to move downward, and the lower shaft end of the integrated load block 50 is inserted into the inner ring of the bearing to be measured 40 and makes the annular step 51 tightly contact the upper end surface of the bearing to be measured 40. The lower end surface of the thrust gas bearing sleeve 60 provides a thrust force to offset the magnetic force between the inner rotor 91 of the magnetic coupling and the outer rotor 90 of the magnetic coupling, and the brushless motor 110 drives the integrated load block 50 to rotate through the inner rotor 91 of the magnetic coupling and the outer rotor 90 of the magnetic coupling, and the step contact surface of the annular step 51 drives the inner ring of the bearing to be measured 40 to rotate. Then, the high-precision inductance measuring table 32 is adjusted to be located at the lower end surface and the inner surface of the inner ring of the bearing to be measured 40, respectively, to measure the end surface runout and radial runout of the inner ring of the bearing to be measured 40.

[0046] Embodiment three of the multifunctional measuring instrument for comprehensive precision of a rolling bearing in the application is shown in Figures 7-8 The difference between the embodiment and embodiment one is that the embodiment is suitable for measuring the protrusion of the outer ring of the bearing to be measured 40. Figure 7 When measuring the protrusion of the outer ring of the bearing to be measured 40, the pressure sensor 21 is first installed on the support step 22 of the replaceable mandrel base 20, and then the reference element 150 is placed on the upper end surface of the pressure sensor 21, and then the magnetic table base 30 is adjusted to make the high-precision inductance measuring table 32 located at the lower end surface of the reference element 150, and the position is adjusted to make the measuring table display a value of 0. After the reference element 150 is removed, the bearing to be measured 40 is installed in the replaceable mandrel base 20, and the lower end surface of the inner ring of the bearing to be measured 40 contacts the pressure sensor 21. Figure 8, the electric driver 130 drives the integrated load block 50 to move downward, and an axial load of the vertical end surface is applied to the upper end surface of the outer ring of the bearing 40 to be measured, and the brushless motor 110 drives the integrated load block 50 to rotate. At this time, the high-precision inductance side measuring table 32 takes the lower end surface of the outer ring of the bearing 40 to be measured as a measuring point, and measures the maximum value and the minimum value of the convexity of the outer ring of the bearing 40 to be measured. Then, the height difference A of the lower end surface of the inner ring relative to the lower end surface of the outer ring is measured, the inner ring width B and the outer ring width C of the bearing 40 to be measured are measured, and the relative convexity D of the upper end surface of the inner ring relative to the upper end surface of the outer ring is obtained.

[0047] As shown in the fourth embodiment of the multifunctional measuring instrument for the comprehensive precision of the rolling bearing of the application, Figures 9-10 The difference between the fourth embodiment and the second embodiment is that the fourth embodiment is suitable for measuring the convexity of the inner ring of the bearing 40 to be measured. Figure 9 When the convexity of the inner ring of the bearing 40 to be measured is measured, the pressure sensor 21 is first installed on the support step of the replaceable mandrel base 20, then the reference element 150 is placed on the upper end surface of the pressure sensor 21, the position of the high-precision inductance side measuring table 32 is adjusted, the table head of the high-precision inductance side measuring table 32 is inserted into the inside of the replaceable mandrel base 20 and located at the lower end surface of the reference element, and the display value of the measuring table is adjusted to 0. After the reference element 150 is removed, the bearing 40 to be measured is installed in the replaceable mandrel base 20, the lower end surface is in contact with the pressure sensor 21, and the outer circle surface of the outer ring is in clearance fit with the mandrel hole. Figure 10 The integrated load block 50 moves downward, the lower end shaft of the integrated load block 50 is inserted into the inner ring of the bearing 40 to be measured, the annular step 51 of the integrated load block 50 is in contact with the upper end surface of the inner ring of the bearing 40 to be measured, and an axial load is applied to the upper end surface of the inner ring of the bearing 40 to be measured. After the brushless motor 110 drives the integrated load block 50 to rotate, the high-precision inductance side measuring table 32 takes the lower end surface of the inner ring of the bearing 40 to be measured as a measuring point, and measures the maximum value and the minimum value of the convexity of the inner ring of the bearing 40 to be measured. Then, the height difference A of the lower end surface of the outer ring relative to the lower end surface of the inner ring is measured, the inner ring width B and the outer ring width C of the bearing 40 to be measured are measured, and the relative convexity D of the upper end surface of the inner ring relative to the upper end surface of the outer ring is obtained.

[0048] The embodiments of the application are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art, and the embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A multifunctional measuring instrument for measuring the overall accuracy of a rolling bearing, characterized in that: The utility model relates to a bearing jump test device, comprising: a work platform; a driving device mounted on the work platform, comprising an axially movable load block and a motor assembly driving the rotation of the load block; a measuring device, comprising a high-precision inductance measuring head for detecting the bearing jump of a bearing to be measured and a pressure sensor for monitoring the axial load; a fixing device, which is a replaceable mandrel base, for supporting the inner ring or outer ring of the bearing to be measured; wherein the driving device applies an axial load to the inner ring or outer ring of the bearing to be measured through the load block and drives the rotation of the inner ring or outer ring, and the measuring device synchronously collects the bearing jump and load data of the bearing to be measured; further comprising: a column connected to the work platform through an electric ball screw to drive the column to move along the radial direction of the bearing to be measured; an electric actuator fixed to the column, a connection plate fixedly arranged on the actuator sliding table of the electric actuator, a brushless motor and a thrust gas float shaft sleeve mounted on the connection plate from top to bottom, a magnetic coupling arranged between the brushless motor and the thrust gas float shaft sleeve, an inner rotor of the magnetic coupling connected to the shaft end of the brushless motor, and an outer rotor of the magnetic coupling connected to the upper end of the load block passing through the inner hole of the thrust gas float shaft sleeve.

2. The multifunctional measuring instrument for the overall precision of a rolling bearing according to claim 1, characterized in that, The load block is of an integrated structure, and the lower end of the load block is provided with an annular step for positioning the inner ring or outer ring of the bearing to be measured, and the upper end shaft part of the load block is connected to the outer rotor of the magnetic coupling. The lower end surface of the thrust gas float shaft sleeve discharges compressed gas to generate axial thrust for offsetting the magnetic attraction force between the inner and outer rotors of the magnetic coupling.

3. The multifunctional measuring instrument for the overall precision of a rolling bearing according to claim 1, characterized in that, The connection plate is divided into a dovetail groove connection plate, a motor connection plate, and a thrust gas float shaft sleeve connection plate. One side of the dovetail groove connection plate is fixed with the actuator sliding block, and the other side is provided with a dovetail groove. One end of the motor connection plate is provided with a tenon matched with the dovetail groove for positioning, and the other end of the motor connection plate is fixed with the brushless motor. One end of the thrust gas float shaft sleeve connection plate is provided with a tenon matched with the dovetail groove for positioning, and the other end of the thrust gas float shaft sleeve connection plate is fixedly mounted with the thrust gas float shaft sleeve.

4. The multifunctional measuring instrument for the overall precision of a rolling bearing according to claim 2, characterized in that, The replaceable mandrel base comprises: a support step for mounting the pressure sensor and supporting the bearing to be measured; and / or the replaceable mandrel base has a hollow shaft structure for avoiding the high-precision inductance measuring head measuring the inner ring of the bearing to be measured.

5. The multifunctional measuring instrument for the overall precision of a rolling bearing according to claim 4, characterized in that, The upper end of the replaceable mandrel base is reduced in diameter to form the support step, the diameter of the upper end of the replaceable mandrel base is smaller than the inner diameter of the pressure sensor, the pressure sensor is sleeved on the upper end of the replaceable mandrel base, the support step limits the downward movement of the pressure sensor, the inner ring of the bearing to be measured is sleeved on the upper end of the replaceable mandrel base and abuts against the pressure sensor downward, the lower end surface of the load block is recessed to form a circular groove, the center of the circular groove is recessed to form the annular step, the outer ring of the bearing to be measured is embedded in the circular groove, and the annular step abuts against the upper surface of the outer ring of the bearing to be measured to provide rotational friction.

6. The multifunctional measuring instrument for the overall precision of a rolling bearing according to claim 4, characterized in that, The replaceable mandrel base has a hollow structure with an upward opening, the inner diameter at the opening is increased to form the support step, the pressure sensor is embedded into the hollow structure downward and is limited to move downward by the support step, the outer ring of the bearing to be measured is embedded into the hollow structure downward and abuts against the pressure sensor, the lower end of the load block is reduced in diameter to form the annular step, the small-diameter lower end of the load block is embedded into the inner ring of the bearing to be measured downward and the annular step abuts against the upper surface of the inner ring of the bearing to be measured to provide the rotating friction force.

7. The multifunctional measuring instrument for the overall precision of a rolling bearing according to claim 1, characterized in that, The measuring device further comprises: magnetic table seats, two of which are installed on the two sides of the working platform and have high-precision inductance measuring heads installed thereon for measuring the rotation accuracy and convexity of the bearing to be measured; the high-precision inductance measuring heads comprise high-precision inductance side measuring tables for measuring the end face runout of the bearing to be measured and / or high-precision measuring tables for measuring the radial runout of the bearing to be measured.

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