A multifunctional bearing testing machine

Abstract

The present invention discloses a multifunctional bearing testing machine, which is a testing machine capable of simultaneously performing axial, radial and overturning loading. The present invention provides two different power sources, namely, constant speed and constant direction constant rotation speed testing can be realized on one device, and a swing reciprocating test at a fixed angle can also be performed, and a bearing test in which the outer ring rotates and the inner ring is fixed or the inner ring rotates and the outer ring is fixed can be performed according to different bearing test fixtures. The present invention includes a drive adjustment part, a power source switching device, a dynamic and static pressure spindle device, a radial loading device, a bearing installation fixture and an axial overturning loading part, wherein the drive adjustment part is arranged on one side of the base, the power source switching device is respectively connected to the drive adjustment part and the dynamic and static pressure spindle device by a coupling, the dynamic and static pressure spindle device is connected to the bearing installation fixture by a locking bolt, the radial loading device is arranged on one side of the bearing installation fixture, and the axial overturning loading part is arranged on one side of the bearing installation fixture.

Description

Technical Field

[0001] The invention belongs to the field of bearing testing machines, and relates to a composite rolling bearing life testing machine, in particular to a bearing life testing machine capable of simultaneously performing axial, radial and overturning loading. Background Art

[0002] Rolling bearings are one of the most widely used mechanical parts, and are also one of the most easily damaged components in mechanical equipment. Especially rolling bearings under high-speed and heavy-load conditions are prone to fatigue, cracks, erosion, indentation and other faults due to the long-term and repeated action of the contact stress on the working surface, which can cause bearing breakage, adhesion, burning and other phenomena, and further cause abnormalities in the entire equipment.

[0003] Therefore, the life test of rolling bearings before leaving the factory can not only improve the production process of bearings, but also guide the timely replacement of bearings used on equipment. At present, there are few bearing life test equipment that can simultaneously meet the requirements of axial loading, overturning loading and radial loading, and can withstand high-speed and heavy-load conditions, and can also meet the requirements of constant speed and constant direction speed testing, and can also complete fixed-angle swing reciprocating testing.

[0004] The present invention is to solve the above-mentioned problem and provides a multifunctional composite test machine for bearing testing, which can not only meet the loading of different combinations of three loading methods, but also can carry out large load loading. At the same time, two different power sources are also provided, that is, constant speed and constant direction constant speed testing can be realized on the same device, and fixed angle swing reciprocating testing can also be carried out. Moreover, according to different bearing test fixtures, the present invention can carry out two types of testing: outer ring rotating and inner ring fixed, or inner ring rotating and outer ring fixed. The mechanism of the present invention is cleverly designed, and multiple functional tests can be realized on one device, and it has the function of convenient switching and the like. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-power source rolling bearing life tester with a composite loading mode, which can withstand bearing tests under high-speed and heavy-load conditions and has the advantages of convenient disassembly and assembly, easy operation, etc.

[0006] The purpose and conception of the present invention are achieved through the following technical solutions:

[0007] A multifunctional bearing testing machine comprises a base, a drive adjustment part, a power source switching device, a dynamic and static pressure spindle device, a radial loading device, a bearing installation tool and an axial overturning loading part, characterized in that the drive adjustment part is arranged on one side of the base and is fixed to a T-slot arranged on the base by a T-bolt, the power source switching device and the dynamic and static pressure spindle device are respectively arranged on a box body of the base, the power source switching device is respectively connected to the drive adjustment part and the dynamic and static pressure spindle device by a coupling, and a torque sensor is arranged between the power source switching device and the dynamic and static pressure spindle device, the dynamic and static pressure spindle device is connected to the bearing installation tool by a locking bolt, the bearing installation tool is arranged between the dynamic and static pressure spindle device, the radial loading device and the axial overturning loading part, the radial loading device is arranged on one side of the bearing installation tool and is first connected by a locking bolt, the radial loading device is fixed in the T-slot arranged on the base by a T-bolt, and the axial overturning loading part is arranged on one side of the bearing installation tool and is locked on the base by a T-bolt.

[0008] The base comprises: a bottom plate, a main guide rail, a secondary guide rail, a large box, a small box cover and a main box cover. An oil delivery groove, a T-slot, an anchor bolt groove and a hanging bolt hole are arranged above the above-mentioned bottom plate. The oil delivery groove is arranged around the bottom plate, the T-slots are evenly spaced along the upper surface of the bottom plate, the anchor bolt grooves are arranged on the side of the bottom plate and are evenly distributed, and the hanging bolt holes are arranged on the two side surfaces of the bottom plate along the length direction, and two holes are arranged on each of the left and right side surfaces; the above-mentioned main guide rail and secondary guide rail are respectively fixed to the bottom plate by locking bolts, the main guide rail can provide a unified positioning reference for the drive adjustment part, the large box and the axial overturning loading part, and the secondary guide rail can provide a high-precision positioning reference for the radial loading device; the above-mentioned large box is fixed to the T-slot on the bottom plate by T-locking bolts, the small box cover and the main box cover are arranged above the large box, and the large box is provided with an oil return groove of the dynamic and static pressure spindle device inside, the front half of the large box is used to install the power source switching device, and the rear half is used to install the dynamic and static pressure spindle device.

[0009] The drive adjustment part includes: a main drive handle adjustment support plate, a main drive handle bearing seat, a main drive handle, a main drive displacement adjustment screw rod, a main drive motor mounting seat, a main drive motor mounting seat locking bolt and a main drive motor. The above-mentioned main drive handle adjustment support plate is fixed to the side of the base plate by bolts, the main drive handle bearing seat is installed on the main drive handle adjustment support plate, and is used to support the main drive displacement adjustment screw rod. One end of the main drive displacement adjustment screw rod is connected to the main drive handle through a square shaft, and the other end is connected to the main drive motor mounting seat through a screw thread. The main drive motor mounting seat locking bolt is used to lock the main drive motor mounting seat on the base plate. The main drive motor is fixed to the main drive motor mounting seat by bolts. When the main drive motor mounting seat locking bolt is loosened, the installation position of the main drive motor can be adjusted by rotating the main drive handle, and then the main drive motor is locked and fixed by locking the main drive motor mounting seat locking bolt.

[0010] The power source switching device includes: a gear shaft, a fixed pressure cover on the upper left of the transmission assembly, a fixed pressure cover on the upper right of the transmission assembly, a swing cylinder mounting frame, a swing cylinder, a transition gear, a transition wheel bracket, a transition gear bearing, a transition gear shaft, a driving gear, a swing cylinder mounting plate, a transition wheel rotating shaft, a transition wheel rotating support bearing, a transition wheel bracket fixing screw, a rotary encoder, a positioning pin, a transition wheel bracket handle, a left bearing bracket, a left end cover, a left gear shaft support bearing, a transmission shaft support shell, a right end cover, a right bearing bracket and a right gear shaft support bearing. The above-mentioned gear shaft is connected to the output shaft of the main drive motor through a coupling, and the gear shaft is connected to the output shaft of the main drive motor through a coupling. The left bearing bracket, left gear shaft support bearing, right bearing bracket and right gear shaft support bearing on the left and right sides are installed on the transmission shaft support shell. The left side of the transmission shaft support shell is fixed to the upper left fixed pressure cover of the transmission assembly by bolts, and the right end is fixed to the upper right fixed pressure cover of the transmission assembly by bolts. The left gear shaft support bearing is sealed and positioned by the left end cover, and the right gear shaft support bearing is sealed and positioned by the right end cover. The middle position of the gear shaft is a gear for power transmission of the swing cylinder, and a gear meshing gap of a certain width is provided on the transmission shaft support shell; the above-mentioned swing cylinder mounting frame is fixed to the large The box body, the swing cylinder is installed on the swing cylinder mounting plate, the swing cylinder mounting plate is locked on the swing cylinder mounting frame by bolts, the rotary encoder is fixed on the tail of the swing cylinder to measure the swing angle of the swing cylinder, and the driving gear is fixed on the output shaft of the swing cylinder; the above-mentioned transition gear is installed on the transition wheel bracket through the transition gear shaft and the transition gear bearing, the transition gear can rotate along the axial direction of the transition gear shaft, the transition gear can mesh with the driving gear and the gear shaft, so as to transmit the movement and torque of the swing cylinder to the gear shaft, the transition wheel rotating shaft is fixed on the swing cylinder mounting frame, and the transition wheel bracket is supported by the transition wheel rotating support bearing. It can rotate along the axial direction of the transition wheel rotating axis, and an arc guide groove is provided above the transition wheel bracket. The transition wheel bracket fixing screw is arranged in the arc guide groove and fixed on the swing cylinder mounting frame. The transition wheel bracket can be locked on the swing cylinder mounting frame through the locking nut on the transition wheel bracket fixing screw. A positioning hole for the transition gear meshing is provided above the transition wheel bracket. The transition wheel bracket cooperates with the positioning hole provided above the transition wheel bracket through the positioning pin provided on the back of the swing cylinder mounting frame to perform precise positioning when the transition gear meshes. The transition wheel bracket handle is fixed to the transition wheel bracket through a threaded connection, and is used to manually switch the power source of the swing cylinder.

[0011] The dynamic and static pressure spindle device described herein comprises: a spindle outer sleeve, a spindle, a rear bearing, a spindle rear retaining ring, a spindle fixing nut, a spindle outer ring flange, a spindle waterproof ring, a spindle limiting pin, a front bearing, a spindle transmission flange, a spindle rear end cover and an intermediate bearing. The above-mentioned rear bearing, intermediate bearing and front bearing are respectively installed in the inner cavity of the spindle outer sleeve, the spindle passes through the middle of the three bearings, the rear bearing is axially positioned by the spindle rear retaining ring, and is locked by the spindle fixing nut. The spindle rear end cover is installed at the tail of the spindle outer sleeve to play an oil sealing role; the above-mentioned intermediate bearing and front bearing are axially positioned by the inner step surface of the spindle outer sleeve, the spindle outer ring flange is installed on the spindle outer sleeve to play an oil sealing role, the above-mentioned spindle waterproof ring is installed on the spindle outer ring flange to prevent external dust from entering, the spindle transmission flange is installed on the front end surface of the spindle, and the spindle limiting pin is installed on the end surface of the spindle transmission flange to play a positioning role.

[0012] The radial loading device comprises: a radial loading base, a radial loading limit column, a radial loading cylinder mounting seat, a radial loading cylinder, a radial loading locking bolt, a radial loading support seat, a radial loading support seat locking bolt and a radial loading head. The radial loading limit column is arranged at the tail of the radial loading base and is used to laterally limit the radial loading cylinder mounting seat. The radial loading cylinder mounting seat cooperates with the radial loading base through a dovetail groove and can slide forward and backward. The radial loading cylinder is fixed to the radial loading cylinder mounting seat by bolts. After the radial loading cylinder mounting seat is appropriately adjusted, it can be locked and fixed to the base plate by the radial loading locking bolt. The radial loading support seat is arranged at the front end of the radial loading base through a dovetail groove, and is used to support the radial loading head. One end of the radial loading head is connected to the output rod of the radial loading cylinder, and the other end is connected to the bearing mounting tooling through a bolt, so that a tensile and compressive radial load can be applied to the outer ring rotating test bearing. After properly adjusting the radial loading support seat, the radial loading support seat can be locked and fixed to the T-slot of the base plate through the radial loading support seat locking bolt; the upper parts of the radial loading base, the radial loading cylinder mounting seat and the radial loading support seat are all provided with a U-groove, which is convenient for adjusting the sliding position.

[0013] The bearing installation tool is an outer ring rotation test tool, including: an outer ring rotation connecting flange, an outer ring rotation test bearing, an outer ring rotation bearing inner ring sleeve retaining ring, an outer ring rotation bearing installation plate, a bearing outer ring sleeve retaining ring, an outer ring rotation bearing outer sleeve retaining ring fastening bolts, an outer ring rotation inner ring sleeve retaining ring fastening bolts, an outer ring rotation snap nut, an outer ring rotation overturning loading connector and an outer ring rotation locking bolt; the outer ring rotation connecting flange is arranged on the left side of the bearing installation tool, and is connected to the bearing through the outer ring rotation tool. The locking bolt hole is connected to the dynamic and static pressure spindle device, the right end of the outer ring rotating connecting flange is connected to the outer ring rotating bearing sleeve through the outer ring rotating locking bolt, and the outer ring rotating connecting flange and the outer ring rotating bearing sleeve are positioned and matched through the positioning cone surface of the outer ring rotating bearing sleeve; the inner ring of the above-mentioned outer ring rotating test bearing is installed on the shaft ring inside the outer ring rotating bearing mounting plate through an interference fit, and is axially fixed by the outer ring rotating bearing inner ring retaining ring, and the outer ring is rotated by the outer ring rotating inner ring retaining ring fastening bolt. The inner ring sleeve retaining ring of the outer ring rotating bearing is fixed on the outer ring rotating bearing mounting plate, the outer ring of the outer ring rotating test bearing is mounted on the outer ring rotating bearing outer sleeve, the outer ring of the outer ring rotating test bearing is axially positioned by the bearing outer ring sleeve retaining ring, and the outer ring sleeve retaining ring of the bearing is fixed to the outer ring rotating bearing outer sleeve by the outer ring rotating outer ring sleeve retaining ring fastening bolt; the outer ring rotating tilting loading connecting piece is arranged below the outer ring rotating bearing mounting plate, and the inner and outer surfaces of the outer ring rotating tilting loading connecting piece are both provided with threads, and the inner thread of the outer ring rotating tilting loading connecting piece It is connected to the overturning loading part in the axial overturning loading part, and is used to apply an overturning load to the inner ring of the outer ring rotating test bearing. The external thread of the outer ring rotating overturning loading connecting piece is connected to the outer ring rotating snap nut, and is used to lock the overturning loading part. The left end face of the outer ring rotating connecting flange is provided with an outer ring rotating flange positioning cone surface connected to the dynamic and static pressure spindle device and an outer ring rotating tooling locking bolt hole, and the right side of the outer ring rotating connecting flange is provided with an outer ring rotating bearing jacket positioning cone surface that cooperates with the outer ring rotating bearing jacket.

[0014] The right end face of the outer ring rotating bearing mounting disk is provided with an outer ring rotating axial loading arc surface which cooperates with the axial loading part in the axial overturning loading part. The outer ring rotating axial loading arc surface can cooperate with the axial loading part. When the outer ring rotating test bearing is subjected to overturning loading and axial loading at the same time, the axial loading part in the axial overturning loading part can produce a slight slip on the outer ring rotating axial loading arc surface to prevent the axial loading rod of the axial loading part from bearing the overturning load; the outer ring rotating axial loading arc surface on the right side of the outer ring rotating bearing mounting disk is provided with An outer ring rotating axial positioning hole can be used to position the axial loading part; an outer ring rotating ejector hole that cooperates with the ejector assembly is provided in the middle position of the right side of the outer ring rotating bearing mounting disk, and the outer ring rotating bearing mounting disk and the ejector assembly cooperate with each other to ensure the rotation accuracy of the outer ring rotating test bearing; an outer ring rotating radial loading seat is provided on one side of the cylindrical surface of the outer ring rotating bearing mounting disk, which can cooperate with the radial loading device to complete the application of radial load to the outer ring rotating test bearing; the above-mentioned outer ring rotating bearing mounting disk is provided with a locking bolt process through hole for locking the outer ring rotating locking bolt.

[0015] The axial overturning loading part comprises: an axial loading part, an overturning loading part, an ejector pin positioning part and a loading base. The axial loading part is located on the upper side of the overturning loading part and is used to apply an axial load to the outer ring rotating test bearing. The overturning loading part is arranged at the middle position and can apply overturning loads in both tensile and compressive directions to the outer ring rotating test bearing. The ejector pin positioning part is arranged on the lower side of the overturning loading part and is used to support the bearing installation tooling and increase the axial rotation stiffness of the axial rotation part. The loading base is arranged above the bottom plate and is used to install the loading part, the overturning loading part and the ejector pin positioning part. The loading base locking bolt arranged above the loading base is a T-bolt, which can cooperate with the T-slot arranged above the bottom plate to fix the loading base. A dovetail groove is arranged above the loading base to support and guide the axial loading part, the overturning loading part and the ejector pin positioning part.

[0016] The axial loading part includes: an axial loading cylinder, an axial loading seat, an axial loading seat locking bolt, an axial pressure sensor, a rear push plate, an axial loading rod wear-resistant sleeve, a guide seat, an axial loading rod, a bidirectional loading connecting bolt, a guide column and a front push plate. The above-mentioned axial loading cylinder is installed on the axial loading seat through a locking bolt, and the axial loading seat is fixed to the loading base through the axial loading seat locking bolt. The axial loading seat is provided with a dovetail groove that cooperates with the loading base. The output rod of the axial loading cylinder is connected to the axial pressure sensor arranged on the rear push plate, one end of the axial loading rod is connected to the rear push plate, and the other end is connected to the front push plate. The push plate is connected, the axial loading rod slides forward and backward through the axial loading rod wear-resistant sleeve arranged in the guide seat, the bidirectional loading connecting bolt is arranged on the front push plate, and is connected to the test bearing installation tooling to apply the tensile and compressive bidirectional loads, the guide column is arranged on the front push plate, and cooperates with the outer ring rotating axial positioning hole on the bearing installation tooling for axial positioning, and the contact surface between the front push plate and the bearing installation tooling is an arc surface, which can prevent the axial loading part from bearing part of the overturning load when the axial load and the overturning load are applied to the bearing installation tooling at the same time, so that only the outer ring rotating test bearing bears the axial load and the overturning load;

[0017] The overturning loading part includes: an overturning loading cylinder, an overturning pressure sensor, a connecting sleeve, an overturning loading shaft, an overturning wear-resistant sleeve and an overturning loading sleeve. The overturning loading cylinder is fixed to the axial loading seat by a locking bolt. The telescopic rod of the overturning loading cylinder is connected to the overturning pressure sensor installed on the connecting sleeve. One end of the overturning loading shaft is connected to the connecting sleeve, and the other end is connected to the outer ring rotating overturning loading connector in the bearing installation tooling to apply overturning loads in both tensile and compressive directions. The overturning loading sleeve is installed in the guide seat by interference fit. A set of overturning wear-resistant sleeves are respectively installed at both ends of the overturning loading sleeve. The overturning wear-resistant sleeve cooperates with the overturning loading shaft to enable the overturning loading shaft to move freely forward and backward.

[0018] The ejector positioning part includes: an advance and retreat handwheel, a handwheel mounting seat, a screw support bearing, a handwheel mounting seat locking bolt, a feed screw, a screw sleeve, a guide seat, an ejector sleeve, an ejector assembly, a guide seat locking bolt, a dovetail base plate and a guide seat connecting bolt. The above-mentioned handwheel mounting seat is fixed to the loading base through the handwheel mounting seat locking bolt. A screw support bearing is provided inside the handwheel mounting seat for supporting the feed screw. One end of the feed screw is connected to the advance and retreat handwheel, and the other end is connected to the screw sleeve. The screw sleeve is installed on the guide seat and can drive the guide seat to move forward and backward by rotating the advance and retreat handwheel. The ejector assembly is installed on the guide seat through the ejector sleeve to provide axial support for the bearing mounting tooling. The guide seat is locked on the dovetail base plate through the guide seat connecting bolt, and the dovetail base plate and the guide seat are fixed to the loading base as a whole through the guide seat locking bolt.

[0019] The inner ring rotating test tooling includes: an inner ring rotating inner ring rotating shaft, an inner ring rotating test bearing, an inner ring rotating bearing inner ring sleeve retaining ring, an inner ring rotating bearing outer ring sleeve retaining ring, an inner ring rotating outer ring sleeve retaining ring fastening bolts, an inner ring rotating inner ring sleeve retaining ring fastening bolts and a sensor mounting assembly. The inner ring rotating inner ring rotating shaft is arranged on the left side of the inner ring rotating test tooling and is fixed to the dynamic and static pressure spindle device through the bolt holes on the left end face, thereby driving the entire inner ring rotating inner ring rotating shaft to rotate; the inner ring rotating test bearing is installed at the journal of the inner ring rotating inner ring rotating shaft, and the width of the journal is slightly smaller than the width of the inner ring of the inner ring rotating test bearing; the inner ring rotating bearing inner ring sleeve The retaining ring is fixed to the inner ring rotating shaft by the inner ring rotating inner ring sleeve retaining ring fastening bolts, and is used for axial positioning of the inner ring rotating test bearing; the inner ring rotating bearing outer sleeve is arranged on the right side of the ring rotating test tooling, and cooperates with the outer ring of the inner ring rotating test bearing; the inner ring rotating bearing outer ring sleeve retaining ring is arranged between the inner ring rotating inner ring rotating shaft and the inner ring rotating bearing outer sleeve, and is connected to the inner ring rotating bearing outer sleeve by the inner ring rotating outer ring sleeve retaining ring fastening bolts, and the inner ring rotating bearing outer ring sleeve retaining ring is provided with a step boss, which is used for axial positioning of the outer ring of the inner ring rotating test bearing, and is locked and fixed by the inner ring rotating outer ring sleeve retaining ring fastening bolts; the above-mentioned sensor mounting assembly is installed on the inner ring rotating bearing outer sleeve;

[0020] The inner ring rotating shaft is provided with an inner ring rotating mounting cone on the left side thereof, and cooperates with the outer cone of the dynamic and static pressure spindle device; the inner ring rotating shaft is provided with an inner ring rotating ejector cone on the right side thereof, and cooperates with the ejector positioning part in the axial overturning loading part;

[0021] An inner ring rotating axial loading arc surface is provided on the right side of the inner ring rotating bearing sleeve, which cooperates with the axial loading part in the axial overturning loading part. When the inner ring rotating test bearing is simultaneously subjected to overturning loading and axial loading, the axial loading part can produce a slight slip on the inner ring rotating axial loading arc surface to prevent the axial loading part from being subjected to the overturning load; an inner ring rotating axial positioning hole is provided above the inner ring rotating axial loading arc surface on the right side of the inner ring rotating bearing sleeve, which can perform axial positioning on the axial loading part, and an inner ring rotating radial loading seat is provided on the outer side of the cylindrical surface of the inner ring rotating bearing sleeve, which can cooperate with the radial loading device to complete the loading of the radial load on the inner ring rotating test bearing.

[0022] Compared with the prior art, i.e., a single rolling bearing test scheme, specifically, a single radial loading test, a single axial loading test or a single overturning loading test, and a single power source, i.e., a single rotation test or a single swing test, and a single outer ring rotation test scheme or an inner ring rotation test scheme. The present invention provides a multifunctional bearing test composite testing machine, which can not only meet the loading of different combinations of three loading methods, but also select different power sources, such as a rotation test or a swing test, and can also select an outer ring type or inner ring rotation type test scheme according to actual test requirements. The present invention not only has an ingenious mechanism design, but also can realize the testing of multiple items on one device, simplifies the bearing test mechanism, and has the characteristics of easy disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the rear integral axle side structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the front overall axle side structure of the present invention.

[0025] Figure 3 It is the main cross-sectional view of the present invention.

[0026] Figure 4 This is a schematic diagram of the base structure.

[0027] Figure 5 This is a schematic diagram of the drive adjustment part.

[0028] Figure 6 This is a schematic diagram of the front axle side structure of the power source switching device.

[0029] Figure 7 It is a schematic diagram of the rear axle side structure of the power source switching device.

[0030] Figure 8 It is a main cross-sectional view of the power source switching device.

[0031] Fig. 9 It is the main sectional view of the dynamic and static pressure spindle device.

[0032] Fig.10 It is a schematic diagram of the front shaft side structure of the radial loading device.

[0033] Fig.11 It is a schematic diagram of the rear axle side structure of the radial loading device.

[0034] Fig.12 This is the front view of the bearing installation tooling.

[0035] Fig.13 for Fig.12 Cross-sectional view in the AA direction.

[0036] Fig.14 for Fig.12 Cross-sectional view along BB direction.

[0037] Fig.15 Schematic diagram of the front axle side structure of the axial overturning loading part.

[0038] Fig.16 It is the main cross-sectional view of the axial overturning loading part.

[0039] Fig.17 This is a schematic diagram of the shaft side structure of the inner ring rotation test fixture.

[0040] Fig.18 This is the main cross-sectional view of the inner ring rotating test fixture.

[0041] As shown in the figure: 1 is the base, 1-1 is the bottom plate, 1-1-1 is the oil delivery groove, 1-1-2 is the T-slot, 1-1-3 is the anchor bolt groove, 1-1-4 is the lifting bolt hole, 1-2 is the main guide rail, 1-3 is the auxiliary guide rail, 1-4 is the large box, 1-5 is the small box cover, 1-6 is the main box cover, 2 is the drive adjustment part, 2-1 is the main drive handle adjustment support plate, 2-2 is the main drive handle bearing seat, 2-3 is the main drive handle, 2-4 is the main drive displacement adjustment screw, 2-5 is the main drive motor mounting seat, 2-6 is the main drive motor mounting seat locking bolt, 2-7 is the main drive motor, 3 is the power source switching device, 3-1 is the gear shaft, 3-2 is the upper left fixed cover of the transmission assembly, 3-3 is the transmission assembly The upper right fixed pressure cover, 3-4 is the swing cylinder mounting frame, 3-5 is the swing cylinder, 3-6 is the transition gear, 3-7 is the transition wheel bracket, 3-8 is the transition gear bearing, 3-9 is the transition gear shaft, 3-10 is the driving gear, 3-11 is the swing cylinder mounting plate, 3-12 is the transition wheel rotating shaft, 3-13 is the transition wheel rotating support bearing, 3-14 is the transition wheel bracket fixing screw, 3-15 is the rotary encoder, 3-16 is the positioning pin, 3-17 is the transition wheel bracket handle, 3-18 is the left bearing bracket, 3-19 is the left end cover, 3-20 is the left gear shaft support bearing, 3-21 is the transmission shaft support shell, 3-22 is the right end cover, 3-23 is the right bearing bracket, 3-24 is the right gear shaft support bearing, 4 is The dynamic and static pressure spindle device, 4-1 is the spindle outer sleeve, 4-2 is the spindle, 4-3 is the rear bearing, 4-4 is the spindle rear retaining ring, 4-5 is the spindle fixing nut, 4-6 is the spindle outer ring flange, 4-7 is the spindle waterproof ring, 4-8 is the spindle limiting pin, 4-9 is the front bearing, 4-10 is the spindle transmission flange, 4-11 is the spindle rear end cover, 4-12 is the intermediate bearing, 5 is the radial loading device, 5-1 is the radial loading base, 5-2 is the radial loading limiting column, 5-3 is the radial loading cylinder mounting seat, 5-4 is the radial loading cylinder, 5-5 is the radial loading locking bolt, 5-6 is the radial loading support seat, 5-7 is the radial loading support seat locking bolt, 5-8 is the radial loading head, 6 is the bearing installation tooling, 6-1 is the outer 6-1-1 is the outer ring rotating flange positioning cone, 6-1-2 is the outer ring rotating bearing jacket positioning cone, 6-1-3 is the outer ring rotating tooling locking bolt hole, 6-2 is the outer ring rotating test bearing, 6-3 is the outer ring rotating bearing inner ring retaining ring, 6-4 is the outer ring rotating bearing mounting plate, 6-4-1 is the outer ring rotating axial loading arc surface, 6-4-2 is the outer ring rotating axial positioning hole, 6-4-3 is the outer ring rotating ejector hole, 6-4-4 is the outer ring rotating radial loading seat, 6-4-5 is the locking bolt process through hole, 6-5 is the outer ring rotating bearing outer ring retaining ring, 6-6 is the outer ring rotating bearing jacket, 6-7 is the outer ring rotating outer ring retaining ring fastening bolt,6-8 is the outer ring rotating inner ring retaining ring fastening bolt, 6-9 is the outer ring rotating snap nut, 6-10 is the outer ring rotating overturning loading connector, 6-11 is the outer ring rotating locking bolt, 7 is the axial overturning loading part, 7-1 is the loading base, 7-2 is the handwheel mounting seat, 7-3 is the axial loading seat, 7-4 is the advance and retreat handwheel, 7-5 is the overturning loading cylinder, 7-6 is the axial loading cylinder, 7-7 is the screw support bearing, 7-8 is the handwheel mounting seat locking nut bolt, 7-9 is the locking bolt of the loading base, 7-10 is the locking bolt of the axial loading seat, 7-11 is the axial pressure sensor, 7-12 is the feed screw, 7-13 is the rear push plate, 7-14 is the wear sleeve of the axial loading rod, 7-15 is the guide seat, 7-16 is the overturning pressure sensor, 7-17 is the connecting sleeve, 7-18 is the overturning loading shaft, 7-19 is the overturning wear sleeve, 7-20 is the overturning loading sleeve, 7-21 is the screw sleeve, 7-22 is the ejector sleeve , 7-23 is the dovetail base plate, 7-24 is the guide seat connecting bolt, 7-25 is the guide seat locking bolt, 7-26 is the ejector assembly, 7-27 is the axial loading rod, 7-28 is the bidirectional loading connecting bolt, 7-29 is the guide column, 7-30 is the front push plate, 8 is the inner ring rotation test fixture, 8-1 is the inner ring rotation shaft, 8-1-1 is the inner ring rotation mounting cone, 8-1-2 is the inner ring rotation ejector cone, 8-2 is the inner ring rotation Type test bearing, 8-3 is the inner ring rotating bearing inner ring sleeve retaining ring, 8-4 is the inner ring rotating bearing outer sleeve, 8-4-1 is the inner ring rotating axial loading arc surface, 8-4-2 is the inner ring rotating axial positioning hole, 8-4-3 is the inner ring rotating radial loading seat, 8-5 is the inner ring rotating bearing outer ring sleeve retaining ring, 8-6 is the inner ring rotating outer ring sleeve retaining ring fastening bolt, 8-7 is the inner ring rotating inner ring sleeve retaining ring fastening bolt, 8-8 is the sensor installation assembly. DETAILED DESCRIPTION

[0042] The following specific examples further describe the purpose of the present invention in detail. The examples cannot be repeated here one by one, but the implementation mode of the present invention is not limited to the following examples.

[0043] See attached Figure 1 To Attachment Figure 3As shown, a multifunctional bearing testing machine includes a base 1, a drive adjustment part 2, a power source switching device 3, a dynamic and static pressure spindle device 4, a radial loading device 5, a bearing installation tool 6 and an axial overturning loading part 7, characterized in that the drive adjustment part 2 is arranged on one side of the base 1, and is fixed to the T-slot 1-1-2 arranged on the base 1 by T-bolts, the power source switching device 3 and the dynamic and static pressure spindle device 4 are respectively arranged on the large box 1-4 of the base 1, the power source switching device 3 is respectively connected to the drive adjustment part 2 and the dynamic and static pressure spindle device 4 by couplings, and the power A torque sensor is provided between the source switching device 3 and the dynamic and static pressure spindle device 4. The dynamic and static pressure spindle device 4 is connected to the bearing mounting tool 6 by a locking bolt. The bearing mounting tool 6 is provided between the dynamic and static pressure spindle device 4, the radial loading device 5 and the axial overturning loading part 7. The radial loading device 5 is provided on one side of the bearing mounting tool 6 and is first connected by a locking bolt. The radial loading device 5 is fixed in a T-slot 1-1-2 provided on the base 1 by a T-bolt. The axial overturning loading part 7 is provided on one side of the bearing mounting tool 6 and is locked on the base 1 by a T-bolt.

[0044] See attached Figure 4 As shown, the base 1 comprises: a bottom plate 1-1, a main guide rail 1-2, a secondary guide rail 1-3, a large box body 1-4, a small box body cover 1-5 and a main box body cover 1-6. The top of the above-mentioned bottom plate 1-1 is provided with an oil delivery groove 1-1-1, a T-shaped groove 1-1-2, an anchor bolt groove 1-1-3 and a hanging bolt hole 1-1-4. The oil delivery groove 1-1-1 is arranged around the bottom plate 1-1, the T-shaped grooves 1-1-2 are evenly spaced along the upper surface of the bottom plate 1-1, the anchor bolt grooves 1-1-3 are arranged on the side of the bottom plate 1-1 and are evenly distributed, and the hanging bolt holes 1-1-4 are arranged on the two side surfaces of the bottom plate 1-1 along the length direction, and two are arranged on each of the left and right side surfaces; the above-mentioned main guide rail 1- 2 and the auxiliary guide rail 1-3 are respectively fixed to the base plate 1-1 by locking bolts, the main guide rail 1-2 can provide a unified positioning reference for the drive adjustment part 2, the large box 1-4 and the axial overturning loading part 7, and the auxiliary guide rail 1-3 can provide a high-precision positioning reference for the radial loading device 5; the above-mentioned large box 1-4 is fixed to the T-slot 1-1-2 on the base plate 1-1 by T-locking bolts, the small box cover 1-5 and the main box cover 1-6 are arranged above the large box 1-4, and the large box 1-4 is provided with a return oil groove for the dynamic and static pressure spindle device 4, the front half of the large box 1-4 is used to install the power source switching device 3, and the rear half is used to install the dynamic and static pressure spindle device 4.

[0045] See attached Figure 5As shown, the drive adjustment part 2 includes: a main drive handle adjustment support plate 2-1, a main drive handle bearing seat 2-2, a main drive handle 2-3, a main drive displacement adjustment screw rod 2-4, a main drive motor mounting seat 2-5, a main drive motor mounting seat locking bolt 2-6 and a main drive motor 2-7. The main drive handle adjustment support plate 2-1 is fixed to the side of the base plate 1-1 by bolts, and the main drive handle bearing seat 2-2 is installed on the main drive handle adjustment support plate 2-1 for supporting the main drive displacement adjustment screw rod 2-4. One end of the main drive displacement adjustment screw rod 2-4 is fixed to the side of the base plate 1-1 by bolts. The square shaft is connected to the main drive handle 2-3, and the other end is connected to the main drive motor mounting seat 2-5 through a screw thread. The main drive motor mounting seat locking bolt 2-6 is used to lock the main drive motor mounting seat 2-5 on the base plate 1-1. The main drive motor 2-7 is fixed to the main drive motor mounting seat 2-5 by bolts. When the main drive motor mounting seat locking bolt 2-6 is loosened, the installation position of the main drive motor 2-7 can be adjusted by rotating the main drive handle 2-3, and then the main drive motor 2-7 is locked and fixed by locking the main drive motor mounting seat locking bolt 2-6.

[0046] See attached Figure 6 To Attachment Figure 8As shown, the power source switching device 3 includes: a gear shaft 3-1, a transmission assembly upper left fixed pressure cover 3-2, a transmission assembly upper right fixed pressure cover 3-3, a swing cylinder mounting frame 3-4, a swing cylinder 3-5, a transition gear 3-6, a transition wheel bracket 3-7, a transition gear bearing 3-8, a transition gear shaft 3-9, a driving gear 3-10, a swing cylinder mounting plate 3-11, a transition wheel rotating shaft 3-12, a transition wheel rotating support bearing 3-13, a transition wheel bracket fixing screw 3-14, and a rotary encoder 3- 15, positioning pin 3-16, transition wheel bracket handle 3-17, left bearing bracket 3-18, left end cover 3-19, left gear shaft support bearing 3-20, transmission shaft support shell 3-21, right end cover 3-22, right bearing bracket 3-23 and right gear shaft support bearing 3-24, the above-mentioned gear shaft 3-1 is connected to the output shaft of the main drive motor 2-7 through a coupling, and the gear shaft 3-1 is connected to the left and right sides of the left bearing bracket 3-18, the left gear shaft support bearing 3-20 and the right bearing bracket 3-23 , the right gear shaft support bearing 3-24 is installed on the transmission shaft support shell 3-21. The left side of the transmission shaft support shell 3-21 is fixed to the upper left fixed cover 3-2 of the transmission assembly by bolts, and the right end is fixed to the upper right fixed cover 3-3 of the transmission assembly by bolts. The left gear shaft support bearing 3-20 is sealed and positioned by the left end cover 3-19, and the right gear shaft support bearing 3-24 is sealed and positioned by the right end cover 3-22. The middle position of the gear shaft 3-1 is a gear for the swing cylinder 3-5 power transmission, a gear meshing gap of a certain width is provided on the transmission shaft support shell 3-21; the above-mentioned swing cylinder mounting frame 3-4 is fixed to the large box body 1-4 by locking bolts, the swing cylinder 3-5 is installed on the swing cylinder mounting plate 3-11, the swing cylinder mounting plate 3-11 is locked on the swing cylinder mounting frame 3-4 by bolts, the rotary encoder 3-15 is fixed to the tail of the swing cylinder 3-5, which is used to measure the swing angle of the swing cylinder 3-5, and the driving gear 3-10 is fixed to the output shaft of the swing cylinder 3-5;The above-mentioned transition gear 3-6 is installed on the transition wheel bracket 3-7 through the transition gear shaft 3-9 and the transition gear bearing 3-8. The transition gear 3-6 can rotate along the axial direction of the transition gear shaft 3-9. The transition gear 3-6 can mesh with the driving gear 3-10 and the gear shaft 3-1, thereby transmitting the movement and torque of the swing cylinder 3-5 to the gear shaft 3-1. The transition wheel rotating shaft 3-12 is fixed on the swing cylinder mounting frame 3-4. The transition wheel bracket 3-7 can rotate along the axial direction of the transition wheel rotating shaft 3-12 under the support of the transition wheel rotating support bearing 3-13. An arc guide groove is provided above the transition wheel bracket 3-7, and the transition wheel bracket fixing screw 3-14 is arranged in the arc guide groove and fixed on the swing cylinder mounting frame 3-4. The transition wheel bracket 3-7 can be locked on the swing cylinder mounting frame 3-4 through the locking nut on the transition wheel bracket fixing screw 3-14. A positioning hole is provided above the transition wheel bracket 3-7 for the transition gear 3-6 to mesh. The transition wheel bracket 3-7 cooperates with the positioning hole provided above the transition wheel bracket 3-7 through the positioning pin 3-16 provided on the back of the swing cylinder mounting frame 3-4 to accurately position the transition gear 3-6 when it meshes. The transition wheel bracket handle 3-17 is fixed on the transition wheel bracket 3-7 through a threaded connection, and is used to manually switch the power source of the swing cylinder 3-5. ;

[0047] See attached Fig. 9 As shown, the dynamic and static pressure spindle device 4 comprises: a spindle outer sleeve 4-1, a spindle 4-2, a rear bearing 4-3, a spindle rear retaining ring 4-4, a spindle fixing nut 4-5, a spindle outer ring flange 4-6, a spindle waterproof ring 4-7, a spindle limiting pin 4-8, a front bearing 4-9, a spindle transmission flange 4-10, a spindle rear end cover 4-11 and an intermediate bearing 4-12. The above-mentioned rear bearing 4-3, intermediate bearing 4-12 and front bearing 4-9 are respectively installed in the inner cavity of the spindle outer sleeve 4-1, the spindle 4-2 passes through the middle of the three bearings, and the rear bearing 4-3 is axially fixed by the spindle rear retaining ring 4-4. The main shaft is in the position and is locked with the main shaft fixing nut 4-5. The main shaft rear end cover 4-11 is installed on the tail of the main shaft outer sleeve 4-1 to seal the oil. The intermediate bearing 4-12 and the front bearing 4-9 are axially positioned by the inner step surface of the main shaft outer sleeve 4-1. The main shaft outer ring flange 4-6 is installed on the main shaft outer sleeve 4-1 to seal the oil. The main shaft waterproof ring 4-7 is installed on the main shaft outer ring flange 4-6 to prevent external dust from entering. The main shaft transmission flange 4-10 is installed on the front end face of the main shaft 4-2. The main shaft limit pin 4-8 is installed on the end face of the main shaft transmission flange 4-10 to play a positioning role.

[0048] See attached Fig.10 To Attachment Fig.11As shown, the radial loading device 5 comprises: a radial loading base 5-1, a radial loading limiting column 5-2, a radial loading cylinder mounting seat 5-3, a radial loading cylinder 5-4, a radial loading locking bolt 5-5, a radial loading support seat 5-6, a radial loading support seat locking bolt 5-7 and a radial loading head 5-8. The radial loading limiting column 5-2 is arranged at the tail of the radial loading base 5-1, and is used for laterally limiting the radial loading cylinder mounting seat 5-3. The radial loading cylinder mounting seat 5-3 cooperates with the radial loading base 5-1 through a dovetail groove and can slide back and forth. The radial loading cylinder 5-4 is fixed to the radial loading cylinder mounting seat 5-3 by bolts. After the radial loading cylinder mounting seat 5-3 is properly adjusted, it can be locked and fixed to the bottom by the radial loading locking bolt 5-5. On the T-slot 1-1-2 of the plate 1-1; the above-mentioned radial loading support seat 5-6 is arranged at the front end of the radial loading base 5-1 through a dovetail groove, which is used to support the radial loading head 5-8. One end of the radial loading head 5-8 is connected to the output rod of the radial loading cylinder 5-4, and the other end is connected to the bearing mounting tooling 6 through bolts, so that tensile and compressive radial loads can be applied to the outer ring rotating test bearing 6-2. After appropriately adjusting the radial loading support seat 5-6, the adjusted radial loading support seat 5-6 can be locked and fixed on the T-slot 1-1-2 of the base plate 1-1 through the radial loading support seat locking bolt 5-7; the upper parts of the above-mentioned radial loading base 5-1, the radial loading cylinder mounting seat 5-3 and the radial loading support seat 5-6 are all provided with U-shaped grooves, which are convenient for adjusting the front and rear sliding positions.

[0049] See attached Figure 12 to Figure 14As shown, the bearing installation tool 6 is an outer ring rotation test tool, including: an outer ring rotation connecting flange 6-1, an outer ring rotation test bearing 6-2, an outer ring rotation bearing inner ring sleeve retaining ring 6-3, an outer ring rotation bearing installation plate 6-4, a bearing outer ring sleeve retaining ring 6-5, an outer ring rotation bearing sleeve 6-6, an outer ring rotation outer ring sleeve retaining ring fastening bolt 6-7, an outer ring rotation inner ring sleeve retaining ring fastening bolt 6-8, an outer ring rotation buckle nut 6-9, an outer ring rotation overturning loading connector 6-10 and an outer ring rotation locking bolt 6-11; the above-mentioned outer ring rotation connecting flange 6-1 is arranged on the left side of the bearing installation tool 6, and is connected to the bearing installation tool 6 by the outer ring rotation test bearing 6-2. The rotating tool locking bolt hole 6-1-3 is connected to the dynamic and static pressure main shaft device 4, the right end of the outer ring rotating connecting flange 6-1 is connected to the outer ring rotating bearing sleeve 6-6 through the outer ring rotating locking bolt 6-11, and the outer ring rotating connecting flange 6-1 and the outer ring rotating bearing sleeve 6-6 are positioned and matched through the outer ring rotating bearing sleeve positioning cone surface 6-1-2; the inner ring of the above-mentioned outer ring rotating test bearing 6-2 is installed on the shaft ring inside the outer ring rotating bearing mounting plate 6-4 through an interference fit, and is axially fixed by the outer ring rotating bearing inner ring retaining ring 6-3, and the outer ring is fixed by the outer ring rotating inner ring retaining ring fastening bolt 6-8 The inner ring retaining ring 6-3 of the rotating bearing is fixed on the outer ring rotating bearing mounting plate 6-4, the outer ring of the outer ring rotating test bearing 6-2 is mounted on the outer ring rotating bearing sleeve 6-6, the outer ring of the outer ring rotating test bearing 6-2 is axially positioned by the outer ring retaining ring 6-5 of the bearing, and the outer ring retaining ring 6-5 of the bearing is fixed to the outer ring rotating bearing sleeve 6-6 by the outer ring rotating outer ring retaining ring fastening bolt 6-7; the above-mentioned outer ring rotating tilting loading connecting piece 6-10 is arranged below the outer ring rotating bearing mounting plate 6-4, and the inner and outer surfaces of the outer ring rotating tilting loading connecting piece 6-10 are both provided with threads, and the outer ring rotating tilting loading connecting piece 6-10 The inner thread is connected with the overturning loading part in the axial overturning loading part 7, and is used to apply an overturning load to the inner ring of the outer ring rotating test bearing 6-2. The outer thread of the outer ring rotating overturning loading connector 6-10 is connected with the outer ring rotating snap nut 6-9, and is used to lock the overturning loading part; the left end face of the outer ring rotating connecting flange 6-1 is provided with an outer ring rotating flange positioning cone surface 6-1-1 connected to the dynamic and static pressure spindle device 4 and an outer ring rotating tooling locking bolt hole 6-1-3, and the right side of the outer ring rotating connecting flange 6-1 is provided with an outer ring rotating bearing jacket positioning cone surface 6-1-2 that cooperates with the outer ring rotating bearing jacket 6-6;

[0050] The right end face of the outer ring rotating bearing mounting plate 6-4 is provided with an outer ring rotating axial loading arc surface 6-4-1 which cooperates with the axial loading part in the axial overturning loading part 7. The outer ring rotating axial loading arc surface 6-4-1 can cooperate with the axial loading part. When the outer ring rotating test bearing 6-2 is simultaneously subjected to overturning loading and axial loading, the axial loading part in the axial overturning loading part 7 can produce a slight slip on the outer ring rotating axial loading arc surface 6-4-1, thereby preventing the axial loading rod 7-27 of the axial loading part from bearing the overturning load. An outer ring rotating axial fixing arc surface 6-4-1 is provided above the outer ring rotating axial loading arc surface 6-4-1 on the right side of the outer ring rotating bearing mounting plate 6-4. The positioning hole 6-4-2 can be used to position the axial loading part; an outer ring rotating pin hole 6-4-3 which cooperates with the pin assembly 7-26 is provided in the middle position of the right side of the outer ring rotating bearing mounting plate 6-4, and the outer ring rotating bearing mounting plate 6-4 and the pin assembly 7-26 cooperate with each other to ensure the rotation accuracy of the outer ring rotating test bearing 6-2; an outer ring rotating radial loading seat 6-4-4 is provided on one side of the cylindrical surface of the outer ring rotating bearing mounting plate 6-4, which can cooperate with the radial loading device 5 to complete the application of radial load to the outer ring rotating test bearing 6-2; the above-mentioned outer ring rotating bearing mounting plate 6-4 is provided with a locking bolt process through hole 6-4-5 for locking the outer ring rotating locking bolt 6-11.

[0051] Refer to the attached Fig.15 and attached Fig.16 As shown, the axial overturning loading part 7 comprises: an axial loading part, an overturning loading part, an ejector pin positioning part and a loading base 7-1. The above-mentioned axial loading part is located on the upper side of the overturning loading part, and is used to realize the application of axial load to the outer ring rotating test bearing 6-2; the overturning loading part is arranged at the middle position, and can apply overturning loads in both tensile and compressive directions to the outer ring rotating test bearing 6-2; the ejector pin positioning part is arranged on the lower side of the overturning loading part, and is used to support the bearing installation tooling 6, and increase the axial rotation stiffness of the axial rotation part; the loading base 7-1 is arranged above the bottom plate 1-1, and is used to install the loading part, the overturning loading part and the ejector pin positioning part. The loading base locking bolt 7-9 arranged above the loading base 7-1 is a T-bolt, which can cooperate with the T-slot 1-1-2 arranged above the bottom plate 1-1 to fix the loading base 7-1; a dovetail groove is arranged above the above-mentioned loading base 7-1, which is used to support and guide the axial loading part, the overturning loading part and the ejector pin positioning part;

[0052] The axial loading part includes: an axial loading cylinder 7-6, an axial loading seat 7-3, an axial loading seat locking bolt 7-10, an axial pressure sensor 7-11, a rear push plate 7-13, an axial loading rod wear-resistant sleeve 7-14, a guide seat 7-15, an axial loading rod 7-27, a two-way loading connecting bolt 7-28, a guide column 7-29 and a front push plate 7-30. The above-mentioned axial loading cylinder 7-6 is installed on the axial loading seat 7-3 through a locking bolt, and the axial loading seat 7-3 is fixed on the loading base 7-1 through the axial loading seat locking bolt 7-10. The axial loading seat 7-3 is provided with a dovetail groove that cooperates with the loading base 7-1. The output rod of the axial loading cylinder 7-6 is connected to the axial pressure sensor 7-11 arranged on the rear push plate 7-13. The axial loading rod 7-27 is connected to the front push plate 7-3. One end is connected to the rear push plate 7-13, and the other end is connected to the front push plate 7-30. The axial loading rod 7-27 slides forward and backward through the axial loading rod wear-resistant sleeve 7-14 set in the guide seat 7-15. The bidirectional loading connecting bolt 7-28 is set on the front push plate 7-30, which is connected to the installation tool of the test bearing to apply the tensile and compressive bidirectional loads. The guide column 7-29 is set on the front push plate 7-30, and cooperates with the outer ring rotating axial positioning hole 6-4-2 on the bearing installation tool 6 for axial positioning. The contact surface between the front push plate 7-30 and the bearing installation tool 6 is an arc surface, which can prevent the axial loading part from bearing part of the overturning load when the axial load and the overturning load are applied to the bearing installation tool 6 at the same time, and only the outer ring rotating test bearing 6-2 is subjected to the axial load and the overturning load.

[0053] The overturning loading part includes: an overturning loading cylinder 7-5, an overturning pressure sensor 7-16, a connecting sleeve 7-17, an overturning loading shaft 7-18, an overturning wear-resistant sleeve 7-19 and an overturning loading sleeve 7-20. The overturning loading cylinder 7-5 is fixed to the axial loading seat 7-3 by a locking bolt, and the telescopic rod of the overturning loading cylinder 7-5 is connected to the overturning pressure sensor 7-16 installed on the connecting sleeve 7-17. One end of the overturning loading shaft 7-18 is connected to the connecting shaft The outer ring of the bearing is connected to the guide seat 7-17, and the other end is connected to the outer ring rotary overturning loading connector 6-10 in the bearing installation tool 6 to apply the overturning load in both tensile and compressive directions. The overturning loading sleeve 7-20 is installed in the guide seat 7-15 through interference fit. A set of overturning wear-resistant sleeves 7-19 are respectively installed at both ends of the overturning loading sleeve 7-20. The overturning wear-resistant sleeves 7-19 cooperate with the overturning loading shaft 7-18 to enable the overturning loading shaft 7-18 to move freely forward and backward.

[0054] The ejector positioning part includes: an advance and retract handwheel 7-4, a handwheel mounting seat 7-2, a screw support bearing 7-7, a handwheel mounting seat locking bolt 7-8, a feed screw 7-12, a screw sleeve 7-21, a guide seat 7-15, an ejector sleeve 7-22, an ejector assembly 7-26, a guide seat locking bolt 7-25, a dovetail base plate 7-23 and a guide seat connecting bolt 7-24. The above-mentioned handwheel mounting seat 7-2 is fixed to the loading base 7-1 by the handwheel mounting seat locking bolt 7-8, and a screw support bearing 7-7 is provided inside the handwheel mounting seat 7-2 for supporting the feed screw 7-12, the feed screw One end of the rod 7-12 is connected to the advance and retreat handwheel 7-4, and the other end is connected to the screw sleeve 7-21. The screw sleeve 7-21 is installed on the guide seat 7-15, and can drive the guide seat 7-15 to move forward and backward by rotating the advance and retreat handwheel 7-4. The ejector assembly 7-26 is installed on the guide seat 7-15 through the ejector sleeve 7-22 to provide axial support for the bearing mounting tooling 6. The guide seat 7-15 is locked on the dovetail base plate 7-23 by the guide seat connecting bolt 7-24. The dovetail base plate 7-23 and the guide seat 7-15 are fixed as a whole to the loading base 7-1 through the guide seat locking bolt 7-25.

[0055] Refer to the attached Fig.17 To Attachment Fig.18As shown, the difference between this embodiment and embodiment 7 is that this embodiment is an inner ring rotation test fixture, and the inner ring rotation test fixture 8 comprises: an inner ring rotation inner ring rotating shaft 8-1, an inner ring rotation test bearing 8-2, an inner ring rotation bearing inner ring sleeve retaining ring 8-3, an inner ring rotation bearing outer sleeve 8-4, an inner ring rotation bearing outer ring sleeve retaining ring 8-5, an inner ring rotation outer ring sleeve retaining ring fastening bolt 8-6, an inner ring rotation inner ring sleeve retaining ring fastening bolt 8-7 and a sensor mounting assembly 8-8, the above-mentioned inner ring rotation inner ring rotating shaft 8-1 is arranged on the left side of the inner ring rotation test fixture 8, and is fixed to the dynamic and static pressure spindle device 4 through the bolt holes on the left end face, thereby driving the rotation of the entire inner ring rotation inner ring rotating shaft 8-1; the above-mentioned inner ring rotation test bearing 8-2 is installed at the shaft neck of the inner ring rotation inner ring rotating shaft 8-1 through interference fit, and the width of the shaft neck is slightly smaller than the inner ring rotation test bearing 8-2 width; the inner ring rotating bearing inner ring sleeve retaining ring 8-3 is fixed on the inner ring rotating inner ring rotating shaft 8-1 by the inner ring rotating inner ring sleeve retaining ring fastening bolt 8-7, and is used for axially positioning the inner ring rotating test bearing 8-2; the inner ring rotating bearing outer ring sleeve retaining ring 8-4 is arranged on the right side of the entire mechanism, and cooperates with the outer ring of the inner ring rotating test bearing 8-2; the inner ring rotating bearing outer ring sleeve retaining ring 8-5 is arranged between the inner ring rotating inner ring rotating shaft 8-1 and the inner ring rotating bearing outer ring sleeve 8-4, and is connected to the inner ring rotating bearing outer ring sleeve retaining ring fastening bolt 8-6, and the inner ring rotating bearing outer ring sleeve retaining ring 8-5 is provided with a boss with a step, which is used for axially positioning the outer ring of the inner ring rotating test bearing 8-2, and is locked and fixed by the inner ring rotating outer ring sleeve retaining ring fastening bolt 8-6; the sensor mounting assembly 8-8 is installed on the inner ring rotating bearing outer ring sleeve 8-4;

[0056] The inner ring rotating shaft 8-1 has an inner ring rotating mounting cone 8-1-1 on the left side thereof, and cooperates with the outer cone of the dynamic and static pressure spindle device 4; the inner ring rotating shaft 8-1 has an inner ring rotating ejector cone 8-1-2 on the right side thereof, and cooperates with the ejector positioning portion in the axial overturning loading portion 7;

[0057] The right side of the inner ring rotating bearing sleeve (8-4) is provided with an inner ring rotating axial loading arc surface (8-4-1), which cooperates with the axial loading part in the axial overturning loading part (7). When the inner ring rotating test bearing (8-2) is simultaneously subjected to overturning loading and axial loading, the axial loading part can generate a slight slip on the inner ring rotating axial loading arc surface (8-4-1) to prevent the axial loading part from bearing the overturning load; an inner ring rotating axial positioning hole (8-4-2) is provided above the inner ring rotating axial loading arc surface (8-4-1) on the right side of the inner ring rotating bearing sleeve (8-4), which can axially position the axial loading part; an inner ring rotating radial loading seat (8-4-3) is provided on the outer side of the cylindrical surface of the inner ring rotating bearing sleeve (8-4), which can cooperate with the radial loading device (5) to complete the loading of the radial load on the inner ring rotating test bearing (8-2).

[0058] The working principle of the present invention is as follows:

[0059] First, according to the actual needs of the tested bearing, choose to adopt an inner rotation test or an outer ring rotation test scheme, that is, choose the bearing installation fixture 6 or the inner ring rotation test fixture 8. Then choose a continuous rotation test or a swing test within a certain angle range, that is, choose the main drive motor 2-7 in the drive adjustment part 2 to work or the swing cylinder 3-5 in the power source switching device 3 to work. Further select the loading load of the test bearing, that is, apply an axial load, a radial load or an overturning load to the test bearing, or a combination of the three loads. After determining the above requirements, the test bearing can be assembled on the test fixture, and then installed on the dynamic and static pressure spindle device 4, and then the corresponding power device is started, the corresponding load is loaded, and the bearing life test can be carried out. Finally, according to the collected vibration signal, it is analyzed to determine whether the tested bearing has a fault.

[0060] The above embodiments are only preferred examples of the present invention and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A multifunctional bearing testing machine, comprising: A base (1), a drive adjustment part (2), a power source switching device (3), a dynamic and static pressure spindle device (4), a radial loading device (5), a bearing installation tool (6) and an axial overturning loading part (7), characterized in that: the drive adjustment part (2) is arranged on one side of the base (1), and is fixed to a T-slot (1-1-2) provided on the base (1) by a T-bolt, the power source switching device (3) and the dynamic and static pressure spindle device (4) are respectively arranged on a large box (1-4) of the base (1), the power source switching device (3) is respectively connected to the drive adjustment part (2) and the dynamic and static pressure spindle device (4) by a coupling, and the power source switching device (3) A torque sensor is provided between the dynamic and static pressure spindle device (4), the dynamic and static pressure spindle device (4) is connected to the bearing installation tool (6) by means of locking bolts, the bearing installation tool (6) is provided between the dynamic and static pressure spindle device (4), the radial loading device (5) and the axial overturning loading part (7), the radial loading device (5) is provided on one side of the bearing installation tool (6) and is connected by means of locking bolts, the radial loading device (5) is fixed in a T-slot (1-1-2) provided on the base (1) by means of T-bolts, the axial overturning loading part (7) is provided on one side of the bearing installation tool (6) and is locked on the base (1) by means of T-bolts; The bearing installation tool (6) is an outer ring rotation test tool or an inner ring rotation test tool, and the outer ring rotation test tool comprises: an outer ring rotation type connecting flange (6-1), an outer ring rotation type test bearing (6-2), an outer ring rotation type bearing inner ring sleeve retaining ring (6-3), an outer ring rotation type bearing installation plate (6-4), an outer ring rotation type bearing outer ring sleeve retaining ring (6-5), an outer ring rotation type bearing outer ring sleeve retaining ring outer ring sleeve retaining ring fastening bolt (6-7), an outer ring rotation type inner ring sleeve retaining ring fastening bolt (6-8), an outer ring rotation type snap nut (6-9), an outer ring rotation type overturning loading connector (6-10) and ... outer ring sleeve retaining ring fastening bolt (6-8), an outer ring rotation type snap nut (6-9), an outer ring rotation type overturning loading connector (6-10) and an outer ring rotation type bearing outer ring sleeve retaining ring outer ring sleeve retaining ring outer ring sleeve retaining ring fastening bolt (6-10) and an outer ring rotation type bearing outer ring sleeve retaining ring outer ring sleeve retaining ring fastening bolt (6-8) The outer ring rotating connection flange (6-1) is arranged on the left side of the bearing installation tool (6), and is connected to the dynamic and static pressure spindle device (4) through the outer ring rotating tool locking bolt hole (6-1-3); the right end of the outer ring rotating connection flange (6-1) is connected to the outer ring rotating bearing sleeve (6-6) through the outer ring rotating locking bolt (6-11); the outer ring rotating connection flange (6-1) and the outer ring rotating bearing sleeve (6-6) are positioned and matched through the outer ring rotating bearing sleeve positioning cone surface (6-1-2); the inner ring of the outer ring rotating test bearing (6-2) is installed The outer ring rotating bearing is mounted on the shaft ring inside the outer ring rotating bearing mounting plate (6-4), and is axially fixed by the outer ring rotating bearing inner ring sleeve retaining ring (6-3), and the outer ring rotating bearing inner ring sleeve retaining ring fastening bolts (6-8) are used to fix the outer ring rotating bearing inner ring sleeve retaining ring (6-3) on the outer ring rotating bearing mounting plate (6-4). The outer ring of the outer ring rotating test bearing (6-2) is mounted on the outer ring rotating bearing outer sleeve (6-6), and the outer ring of the outer ring rotating test bearing (6-2) is axially positioned by the outer ring rotating bearing outer ring sleeve retaining ring (6-5), and the outer ring rotating bearing outer ring sleeve retaining ring fastening bolts (6-7) are used to fix the outer ring rotating bearing outer ring The retaining ring (6-5) is fixed on the outer ring rotating bearing sleeve (6-6); the outer ring rotating tilting loading connecting piece (6-10) is arranged below the outer ring rotating bearing mounting plate (6-4), and the inner and outer surfaces of the outer ring rotating tilting loading connecting piece (6-10) are both provided with threads, the inner thread of the outer ring rotating tilting loading connecting piece (6-10) is connected to the tilting loading part in the axial tilting loading part (7) to apply a tilting load to the inner ring of the outer ring rotating test bearing (6-2), and the outer thread of the outer ring rotating tilting loading connecting piece (6-10) is connected to the outer ring rotating buckle nut (6-9) to lock the tilting loading part;The left end surface of the outer ring rotating connecting flange (6-1) is provided with an outer ring rotating flange positioning cone (6-1-1) connected to the dynamic and static pressure spindle device (4) and an outer ring rotating tooling locking bolt hole (6-1-3), and the right side of the outer ring rotating connecting flange (6-1) is provided with an outer ring rotating bearing sleeve positioning cone (6-1-2) that cooperates with the outer ring rotating bearing sleeve (6-6); The right end face of the outer ring rotating bearing mounting plate (6-4) is provided with an outer ring rotating axial loading arc surface (6-4-1) which cooperates with the axial loading part in the axial overturning loading part (7); the outer ring rotating axial loading arc surface (6-4-1) can cooperate with the axial loading part, and when the overturning load and the axial load are applied to the outer ring rotating test bearing (6-2) at the same time, the axial loading part in the axial overturning loading part (7) can produce a slight slip on the outer ring rotating axial loading arc surface (6-4-1), thereby preventing the axial loading rod (7-27) of the axial loading part from bearing the overturning load; an outer ring rotating axial positioning hole (6-4-1) is provided above the outer ring rotating axial loading arc surface (6-4-1) on the right side of the outer ring rotating bearing mounting plate (6-4). -4-2), which can position the axial loading part; an outer ring rotating pin hole (6-4-3) cooperating with the pin assembly (7-26) is provided in the middle position of the right side of the outer ring rotating bearing mounting plate (6-4), and the outer ring rotating bearing mounting plate (6-4) and the pin assembly (7-26) cooperate with each other to ensure the rotation accuracy of the outer ring rotating test bearing (6-2); an outer ring rotating radial loading seat (6-4-4) is provided on one side of the cylindrical surface of the outer ring rotating bearing mounting plate (6-4), which can cooperate with the radial loading device (5) to complete the application of radial load to the outer ring rotating test bearing (6-2); the above-mentioned outer ring rotating bearing mounting plate (6-4) is provided with a locking bolt process through hole (6-4-5) for locking the outer ring rotating locking bolt (6-11); The inner ring rotating test fixture (8) comprises: an inner ring rotating inner ring rotating shaft (8-1), an inner ring rotating test bearing (8-2), an inner ring rotating bearing inner ring sleeve retaining ring (8-3), an inner ring rotating bearing outer ring sleeve retaining ring (8-4), an inner ring rotating bearing outer ring sleeve retaining ring (8-5), an inner ring rotating outer ring sleeve retaining ring fastening bolt (8-6), an inner ring rotating inner ring sleeve retaining ring fastening bolt (8-7) and a sensor mounting assembly (8-8). The inner ring rotating inner ring rotating shaft (8-1) is arranged on the left side of the inner ring rotating test fixture (8), and is fixed to the dynamic and static pressure spindle device (4) through the bolt hole on the left end face, thereby driving the entire inner ring rotating inner ring rotating shaft (8-1) rotates; the inner ring rotating test bearing (8-2) is installed at the journal of the inner ring rotating inner ring rotating shaft (8-1), and the width of the journal is slightly smaller than the width of the inner ring of the inner ring rotating test bearing (8-2); the inner ring rotating bearing inner ring retaining ring (8-3) is fixed to the inner ring rotating inner ring rotating shaft (8-1) by the inner ring rotating inner ring retaining ring fastening bolt (8-7), which is used for axial positioning of the inner ring rotating test bearing (8-2); the inner ring rotating bearing outer ring (8-4) is arranged on the right side of the inner ring rotating test fixture (8), and cooperates with the outer ring of the inner ring rotating test bearing (8-2); the inner ring rotating bearing outer ring retaining ring The ring (8-5) is arranged between the inner ring rotating shaft (8-1) and the inner ring rotating bearing sleeve (8-4), and is connected to the inner ring rotating bearing sleeve (8-4) through the inner ring rotating outer ring sleeve retaining ring fastening bolt (8-6); the inner ring rotating bearing outer ring sleeve retaining ring (8-5) is provided with a step boss for axially positioning the outer ring of the inner ring rotating test bearing (8-2), and is locked and fixed by the inner ring rotating outer ring sleeve retaining ring fastening bolt (8-6); the above-mentioned sensor installation assembly (8-8) is installed on the inner ring rotating bearing sleeve (8-4); the left side of the inner ring rotating shaft (8-1) is provided with an inner ring rotating installation cone surface (8-1-1) , and cooperates with the outer conical surface of the dynamic and static pressure spindle device (4); the right side of the inner ring rotating inner ring rotating shaft (8-1) is provided with an inner ring rotating ejector cone surface (8-1-2) which cooperates with the ejector positioning part in the axial overturning loading part (7); the right side of the inner ring rotating bearing sleeve (8-4) is provided with an inner ring rotating axial loading arc surface (8-4-1) which cooperates with the axial loading part in the axial overturning loading part (7); when the inner ring rotating test bearing (8-2) is simultaneously subjected to overturning loading and axial loading, the axial loading part can generate a slight slip on the inner ring rotating axial loading arc surface (8-4-1) to prevent the axial loading part from bearing the overturning load;An inner ring rotating axial positioning hole (8-4-2) is provided above the inner ring rotating axial loading arc surface (8-4-1) on the right side of the inner ring rotating bearing sleeve (8-4), which can axially position the axial loading part; an inner ring rotating radial loading seat (8-4-3) is provided on the outer side of the cylindrical surface of the inner ring rotating bearing sleeve (8-4), which can cooperate with the radial loading device (5) to complete the loading of the radial load of the inner ring rotating test bearing (8-2); The base (1) comprises: a bottom plate (1-1), a main guide rail (1-2), a secondary guide rail (1-3), a large box (1-4), a small box cover (1-5) and a main box cover (1-6); an oil delivery groove (1-1-1), a T-shaped groove (1-1-2), an anchor bolt groove (1-1-3) and a hanging bolt hole (1-1-4) are arranged above the bottom plate (1-1); the oil delivery groove (1-1-1) is arranged around the bottom plate (1-1); the T-shaped grooves (1-1-2) are evenly spaced along the upper surface of the bottom plate (1-1); the anchor bolt grooves (1-1-3) are evenly distributed on the side of the bottom plate (1-1); the hanging bolt holes (1-1-4) are arranged on both side surfaces of the bottom plate (1-1) along the length direction, and two are arranged on each of the left and right side surfaces; the main guide rail (1-1-2) is arranged on the bottom plate (1-1); the anchor bolt grooves (1-1-3) are evenly distributed on the side of the bottom plate (1-1); the hanging bolt holes (1-1-4) are arranged on both side surfaces of the bottom plate (1-1) along the length direction; and two are arranged on each of the left and right side surfaces; The main guide rail (1-2) and the auxiliary guide rail (1-3) are respectively fixed on the base plate (1-1) by locking bolts, the main guide rail (1-2) can provide a unified positioning reference for the drive adjustment part (2), the large box (1-4) and the axial overturning loading part (7), and the auxiliary guide rail (1-3) can provide a high-precision positioning reference for the radial loading device (5); the above-mentioned large box (1-4) is fixed on the T-slot (1-1-2) on the base plate (1-1) by T-locking bolts, the small box cover (1-5) and the main box cover (1-6) are arranged above the large box (1-4), and the large box (1-4) is provided with a return oil groove of the dynamic and static pressure spindle device (4), the front half of the large box (1-4) is used to install the power source switching device (3), and the rear half is used to install the dynamic and static pressure spindle device (4).

2. The multifunctional bearing testing machine according to claim 1, characterized in that: The drive adjustment part (2) comprises: a main drive handle adjustment support plate (2-1), a main drive handle bearing seat (2-2), a main drive handle (2-3), a main drive displacement adjustment screw rod (2-4), a main drive motor mounting seat (2-5), a main drive motor mounting seat locking bolt (2-6) and a main drive motor (2-7). The main drive handle adjustment support plate (2-1) is fixed to the side of the base plate (1-1) by bolts, and the main drive handle bearing seat (2-2) is installed on the main drive handle adjustment support plate (2-1) to support the main drive displacement adjustment screw rod (2-4). One end of the main drive displacement adjustment screw rod (2-4) is fixed to the side of the base plate (1-1) by bolts. The square shaft is connected to the main drive handle (2-3), and the other end is connected to the main drive motor mounting seat (2-5) through a screw thread. The main drive motor mounting seat locking bolt (2-6) is used to lock the main drive motor mounting seat (2-5) on the bottom plate (1-1). The main drive motor (2-7) is fixed to the main drive motor mounting seat (2-5) through bolts. When the main drive motor mounting seat locking bolt (2-6) is loosened, the installation position of the main drive motor (2-7) can be adjusted by rotating the main drive handle (2-3), and then the main drive motor (2-7) can be locked and fixed by locking the main drive motor mounting seat locking bolt (2-6).

3. The multifunctional bearing testing machine according to claim 1, characterized in that: The power source switching device (3) comprises: a gear shaft (3-1), a transmission assembly upper left fixed pressure cover (3-2), a transmission assembly upper right fixed pressure cover (3-3), a swing cylinder mounting frame (3-4), a swing cylinder (3-5), a transition gear (3-6), a transition wheel bracket (3-7), a transition gear bearing (3-8), a transition gear shaft (3-9), a driving gear (3-10), a swing cylinder mounting plate (3-11), a transition wheel rotating shaft (3-12), a transition wheel rotating support bearing (3-13), a transition wheel bracket fixing screw (3-14), a rotary encoder (3-15), and a rotary encoder (3-16). -15), positioning pin (3-16), transition wheel bracket handle (3-17), left bearing bracket (3-18), left end cover (3-19), left gear shaft support bearing (3-20), transmission shaft support shell (3-21), right end cover (3-22), right bearing bracket (3-23) and right gear shaft support bearing (3-24), the above-mentioned gear shaft (3-1) is connected to the output shaft of the main drive motor (2-7) through a coupling, and the gear shaft (3-1) is connected to the left and right sides of the left bearing bracket (3-18), the left gear shaft support bearing (3-20), the right bearing bracket ( 3-23), the right gear shaft support bearing (3-24) is installed on the transmission shaft support shell (3-21), the left side of the transmission shaft support shell (3-21) is fixed to the upper left fixed cover (3-2) of the transmission assembly by bolts, and the right end is fixed to the upper right fixed cover (3-3) of the transmission assembly by bolts, and the left gear shaft support bearing (3-20) is sealed and positioned by the left end cover (3-19), and the right gear shaft support bearing (3-24) is sealed and positioned by the right end cover (3-22), and a gear is provided in the middle position of the gear shaft (3-1) for the swing cylinder (3-5) is a power transmission device, and a gear meshing clearance of a certain width is provided on the transmission shaft support shell (3-21); the above-mentioned swing cylinder mounting frame (3-4) is fixed to the large box (1-4) by locking bolts, the swing cylinder (3-5) is installed on the swing cylinder mounting plate (3-11), the swing cylinder mounting plate (3-11) is locked on the swing cylinder mounting frame (3-4) by bolts, the rotary encoder (3-15) is fixed to the tail of the swing cylinder (3-5) for measuring the swing angle of the swing cylinder (3-5), and the driving gear (3-10) is fixed to the output shaft of the swing cylinder (3-5);The above-mentioned transition gear (3-6) is installed on the transition wheel bracket (3-7) through the transition gear shaft (3-9) and the transition gear bearing (3-8). The transition gear (3-6) can rotate along the axial direction of the transition gear shaft (3-9). The transition gear (3-6) can mesh with the driving gear (3-10) and the gear shaft (3-1), thereby transmitting the movement and torque of the swing cylinder (3-5) to the gear shaft (3-1). The transition wheel rotating shaft (3-12) is fixed on the swing cylinder mounting frame (3-4). The transition wheel bracket (3-7) can rotate along the axial direction of the transition wheel rotating shaft (3-12) under the support of the transition wheel rotating support bearing (3-13). An arc guide groove is provided above the transition wheel bracket (3-7). The transition wheel bracket is fixed The screw rod (3-14) is arranged in the arc-shaped guide rail groove and fixed on the swing cylinder mounting frame (3-4). The transition wheel bracket (3-7) can be locked on the swing cylinder mounting frame (3-4) through the locking nut on the transition wheel bracket fixing screw rod (3-14). A positioning hole for the transition gear (3-6) to be engaged is arranged above the transition wheel bracket (3-7). The transition wheel bracket (3-7) cooperates with the positioning hole arranged above the transition wheel bracket (3-7) through the positioning pin (3-16) arranged on the back of the swing cylinder mounting frame (3-4) to accurately position the transition gear (3-6) when it is engaged. The transition wheel bracket handle (3-17) is fixed on the transition wheel bracket (3-7) through a threaded connection and is used to manually switch the power source of the swing cylinder (3-5). ; 4. The multifunctional bearing testing machine according to claim 1, characterized in that: The dynamic and static pressure spindle device (4) comprises: a spindle outer sleeve (4-1), a spindle (4-2), a rear bearing (4-3), a spindle rear retaining ring (4-4), a spindle fixing nut (4-5), a spindle outer ring flange (4-6), a spindle waterproof ring (4-7), a spindle limiting pin (4-8), a front bearing (4-9), a spindle transmission flange (4-10), a spindle rear end cover (4-11) and an intermediate bearing (4-12). The rear bearing (4-3), the intermediate bearing (4-12) and the front bearing (4-9) are respectively installed in the inner cavity of the spindle outer sleeve (4-1), the spindle (4-2) passes through the middle of the three bearings, and the rear bearing (4-3) passes through the spindle rear retaining ring (4-4). Axial positioning is performed and the spindle fixing nut (4-5) is used for locking. The rear end cover (4-11) of the spindle is installed at the tail of the spindle outer sleeve (4-1) to play the role of oil sealing. The intermediate bearing (4-12) and the front bearing (4-9) are axially positioned through the inner step surface of the spindle outer sleeve (4-1). The spindle outer ring flange (4-6) is installed on the spindle outer sleeve (4-1) to play the role of oil sealing. The spindle waterproof ring (4-7) is installed on the spindle outer ring flange (4-6) to prevent external dust from entering. The spindle transmission flange (4-10) is installed on the front end surface of the spindle (4-2). The spindle limit pin (4-8) is installed on the end surface of the spindle transmission flange (4-10) to play a positioning role.

5. The multifunctional bearing testing machine according to claim 1, characterized in that: When the bearing mounting fixture is an outer ring rotation test fixture, the radial loading device (5) comprises: a radial loading base (5-1), a radial loading limit column (5-2), a radial loading cylinder mounting seat (5-3), a radial loading cylinder (5-4), a radial loading locking bolt (5-5), a radial loading support seat (5-6), a radial loading support seat locking bolt (5-7) and a radial loading head (5-8). The radial loading limit column (5-2) is arranged at the tail of the radial loading base (5-1) and is used to laterally limit the radial loading cylinder mounting seat (5-3). The radial loading cylinder mounting seat (5-3) cooperates with the radial loading base (5-1) through a dovetail groove. The radial loading cylinder (5-4) is fixed to the radial loading cylinder mounting seat (5-3) by bolts. By properly adjusting the radial loading cylinder mounting seat (5-3), the radial loading locking bolt (5-5) can be used to lock the radial loading cylinder. The radial loading support seat (5-6) is fixed on the T-slot (1-1-2) of the base plate (1-1); the radial loading support seat (5-6) is arranged at the front end of the radial loading base (5-1) through a dovetail groove, and is used to support a radial loading head (5-8); one end of the radial loading head (5-8) is connected to the output rod of the radial loading cylinder (5-4), and the other end is connected to the bearing mounting fixture (6) through a bolt, so that a tensile and compressive radial load can be applied to the outer ring rotating test bearing (6-2); after the radial loading support seat (5-6) is properly adjusted, the radial loading support seat (5-6) can be locked and fixed on the T-slot (1-1-2) of the base plate (1-1) by using the radial loading support seat locking bolt (5-7); the upper parts of the radial loading base (5-1), the radial loading cylinder mounting seat (5-3) and the radial loading support seat (5-6) are all provided with a U-groove to facilitate the adjustment of the sliding position.

6. The multifunctional bearing testing machine according to claim 1, characterized in that: When the bearing installation tool is an outer ring rotation test tool, the axial overturning loading part (7) includes: an axial loading part, a overturning loading part, a pin positioning part and a loading base (7-1), wherein the axial loading part is located on the upper side of the overturning loading part and is used to apply an axial load to the outer ring rotation test bearing (6-2); the overturning loading part is located at the middle position and can apply overturning loads in both tensile and compressive directions to the outer ring rotation test bearing (6-2); the pin positioning part is located on the lower side of the overturning loading part and is used to support the bearing installation tool ( 6) to increase the axial rotation stiffness of the axial rotation part; the loading base (7-1) is arranged above the base plate (1-1) and is used to install the loading part, the overturning loading part and the ejector positioning part. The loading base locking bolt (7-9) arranged above the loading base (7-1) is a T-bolt, which can cooperate with the T-slot (1-1-2) arranged above the base plate (1-1) to fix the loading base (7-1); a dovetail groove is arranged above the above-mentioned loading base (7-1) to support and guide the axial loading part, the overturning loading part and the ejector positioning part; The axial loading part comprises: an axial loading cylinder (7-6), an axial loading seat (7-3), an axial loading seat locking bolt (7-10), an axial pressure sensor (7-11), a rear thrust plate (7-13), an axial loading rod wear-resistant sleeve (7-14), a guide seat (7-15), an axial loading rod (7-27), a bidirectional loading connecting bolt (7-28), a guide column (7-29) and a front thrust plate (7-30). The axial loading cylinder (7-6) is installed on the axial loading seat (7-3) through the locking bolt, the axial loading seat (7-3) is fixed on the loading base (7-1) through the axial loading seat locking bolt (7-10), the axial loading seat (7-3) is provided with a dovetail groove that cooperates with the loading base (7-1), the output rod of the axial loading cylinder (7-6) is connected to the axial pressure sensor (7-11) arranged on the rear thrust plate (7-13), one end of the axial loading rod (7-27) is connected to the rear thrust plate (7-13), and one end of the axial loading rod (7-27) is connected to the rear thrust plate (7-13). The push plate (7-13) is connected with the push plate (7-13), and the other end is connected with the front push plate (7-30). The axial loading rod (7-27) slides forward and backward through the axial loading rod wear-resistant sleeve (7-14) arranged in the guide seat (7-15). The bidirectional loading connecting bolt (7-28) is arranged on the front push plate (7-30) and connected with the outer ring rotating bearing mounting plate (6-4). The bidirectional loading load can be applied to the outer ring rotating test bearing (6-2). The guide column (7-29) is arranged on the front push plate (7-30) and cooperates with the outer ring rotating axial positioning hole (6-4-2) on the bearing mounting tool (6) for axial positioning. The contact surface between the front push plate (7-30) and the bearing mounting tool (6) is an arc surface, which can prevent the axial loading part from bearing part of the overturning load when the axial load and the overturning load are applied to the bearing mounting tool (6) at the same time, so that only the outer ring rotating test bearing (6-2) is subjected to the axial load and the overturning load. The overturning loading part comprises: an overturning loading cylinder (7-5), an overturning pressure sensor (7-16), a connecting sleeve (7-17), an overturning loading shaft (7-18), an overturning wear-resistant sleeve (7-19) and an overturning loading sleeve (7-20), wherein the overturning loading cylinder (7-5) is fixed to the axial loading seat (7-3) by a locking bolt, the telescopic rod of the overturning loading cylinder (7-5) is connected to the overturning pressure sensor (7-16) installed on the connecting sleeve (7-17), and one end of the overturning loading shaft (7-18) is connected to the connecting sleeve (7-17). The first end of the bearing assembly (7-17) is connected to the shaft sleeve (7-17), and the other end is connected to the outer ring rotary tilting loading connector (6-10) in the bearing installation tool (6) to apply tilting load in both tensile and compressive directions. The tilting loading sleeve (7-20) is installed in the guide seat (7-15) through interference fit. A set of tilting wear-resistant sleeves (7-19) are respectively installed at both ends of the tilting loading sleeve (7-20). The tilting wear-resistant sleeves (7-19) cooperate with the tilting loading shaft (7-18) to enable the tilting loading shaft (7-18) to move freely forward and backward. The ejector positioning part comprises: an advance and retreat hand wheel (7-4), a hand wheel mounting seat (7-2), a screw support bearing (7-7), a hand wheel mounting seat locking bolt (7-8), a feed screw (7-12), a screw sleeve (7-21), a guide seat (7-15), an ejector sleeve (7-22), an ejector assembly (7-26), a guide seat locking bolt (7-25), a dovetail base plate (7-23) and a guide seat connecting bolt (7-24). The hand wheel mounting seat (7-2) is fixed to the loading base (7-1) by the hand wheel mounting seat locking bolt (7-8). A screw support bearing (7-7) is provided inside the hand wheel mounting seat (7-2) for supporting the feed screw (7-12). One end of the rod (7-12) is connected to the advance / retract hand wheel (7-4), and the other end is connected to the screw sleeve (7-21). The screw sleeve (7-21) is installed on the guide seat (7-15) and can drive the guide seat (7-15) to move forward and backward by rotating the advance / retract hand wheel (7-4). The ejector assembly (7-26) is installed on the guide seat (7-15) through the ejector sleeve (7-22) and is used for axial support of the bearing installation tool (6). The guide seat (7-15) is locked on the dovetail base plate (7-23) through the guide seat connecting bolt (7-24). The dovetail base plate (7-23) and the guide seat (7-15) are fixed to the loading base (7-1) as a whole through the guide seat locking bolt (7-25).

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