Rolling bearing service life testing machine

Abstract

The utility model relates to a rolling bearing life testing machine, which belongs to the technical field of testing machines and comprises a base and a box body, a testing mechanism is arranged at the top of the base and comprises a motor fixedly mounted at the top of the base, a torque sensor is fixedly mounted at the top of the base, a bearing seat is fixedly mounted in the box body, and the bearing seat is fixedly mounted in the box body. And a radial hydraulic cylinder is fixedly mounted at the top of the box body. According to the rolling bearing service life testing machine, the upper limit of the rotating speed of the testing machine is high, the upper limit of the rotating speed of the motor is increased, a lubricating system is additionally arranged, the bearing seat is of an integral box type structure, and therefore testing under the condition that a tested bearing is not installed in a centered mode can be completed; the test under the condition of insufficient lubrication of the test bearing can be completed, life prediction is completed by adjusting the amount of lubricating oil entering the test bearing seat and the temperature, and the state of the bearing is judged by measuring the rotating speed and the torque of a rotating shaft by adding a dynamic torque sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of testing machines, in particular to a rolling bearing life testing machine. Background Art

[0002] The life and reliability of rolling bearings are very important for mechanical equipment. The life of rolling bearings includes fatigue life, vibration life, precision life, wear life, and noise life. To comprehensively test and analyze the life of bearings, it is necessary to ensure the accuracy and stability of the test conditions, and at the same time, to ensure the comprehensiveness and intuitiveness of the test data.

[0003] The existing rolling bearing life test method is to design the test bearing at the cantilever end through a cantilever beam structure. This method has the following disadvantages: it can only complete the bearing life prediction at low speed (below 4000rpm); it cannot simulate the life prediction of the bearing under different installation conditions (angle, parallel, mixed misalignment); it cannot simulate the bearing life prediction under different lubrication conditions; it cannot judge the bearing state through speed or torque fluctuations; it cannot directly and reliably measure the loading force or program-controlled loading force size, so a rolling bearing life tester is proposed to solve the above problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a rolling bearing life tester, which has the advantages of adding a lubrication system to support the first bearing and the second bearing of the rotating shaft for lubrication and cooling, so that the maximum experimental rotation speed can reach 12000rpm; by designing a height, level and angle adjustable mechanism at the bottom of the test bearing seat, simulating different installation conditions of the bearing to complete the life prediction; by adjusting the amount and temperature of the lubricating oil entering the test bearing seat to complete the life prediction; by adding a dynamic torque sensor to measure the rotation speed and torque of the rotating shaft to judge the bearing state; by adding radial and axial force sensors to measure the loading force in real time, and by using an electronically controlled proportional valve to achieve programmable adjustment of the hydraulic loading force, etc., it solves the problems that in the existing rolling bearing life test, only the bearing life prediction can be completed at low speed (below 4000rpm); the life prediction under different installation conditions (angle, parallel, mixed misalignment) of the bearing cannot be simulated; the bearing life prediction under different lubrication conditions cannot be simulated; the bearing state cannot be judged by the rotation speed or torque fluctuation; the loading force cannot be directly and reliably measured or the size of the programmable loading force cannot be controlled.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rolling bearing life tester, comprising a base and a box, wherein a testing mechanism is provided on the top of the base;

[0006] The testing mechanism includes a motor fixedly mounted on the top of the base, a torque sensor fixedly mounted on the top of the base, a bearing seat fixedly mounted inside the box, a radial hydraulic cylinder fixedly mounted on the top of the box, a test bearing seat fixedly mounted inside the box, an axial hydraulic cylinder fixedly mounted on the right side of the box, a misalignment adjustment assembly fixedly mounted on the bottom inner wall of the box, a rotating shaft rotatably connected to the inner circumferential wall of the bearing seat, a radial sensor mounted on the top of the test bearing seat, and an axial sensor mounted on the right side of the test bearing seat.

[0007] Further, the misalignment adjustment component includes a base plate, two side plates are installed on the top of the base plate, two first sliders are slidably connected to the top of the base plate, the top of the first slider is movably connected to the second slider, the top of the second slider is installed with a top plate, the outer wall of the base plate is respectively installed with a rear plate and a front plate, a thrust ball bearing is installed inside the front plate, a screw rod is installed inside the thrust ball bearing, the interior of the front plate is threadedly connected with a hexagonal screw, the outer peripheral wall of the screw rod is threadedly connected with a hexagonal thin nut, the outer peripheral wall of the hexagonal screw is threadedly connected with a hexagonal nut, and a limiting plate is installed on the top of the top plate.

[0008] Furthermore, a bearing retaining ring is provided on the outer wall of the rotating shaft, a sleeve end cover is installed on the outer wall of the bearing retaining ring, a first cylindrical roller bearing is installed on the outer wall of the sleeve end cover, an angular contact bearing is installed on the outer wall of the rotating shaft, and two second cylindrical roller bearings are installed on the outer wall of the rotating shaft.

[0009] Furthermore, a bearing preloader is installed on the outer wall of the axial sensor, and two tapered roller bearings are installed on the outer wall of the bearing preloader. A test bearing seat is installed on the outer walls on the opposite sides of the two tapered roller bearings, and an end cover of the test bearing seat is installed on the left side of the test bearing seat.

[0010] Furthermore, the output shaft of the motor is connected and installed with the torque sensor, a through hole is opened inside the box, the rotating shaft is slidably connected inside the through hole and the size is adapted, and the left side of the rotating shaft is connected and installed with the torque sensor.

[0011] Furthermore, there are two test bearing seats, the rotating shaft is located between the two test bearing seats, the right side of the rotating shaft is attached to the left side of the axial sensor, and the bottom of the test bearing seat is connected and installed with the top of the misalignment adjustment assembly.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] 1. The rolling bearing life tester has a high upper speed limit. By increasing the upper speed limit of the motor and adding a lubrication system, the bearing seat is an integral box-type structure, which can complete the test of the bearing under misaligned installation. By designing a height, level and angle adjustable mechanism at the bottom of the test bearing seat, the test can be completed when the bearing is insufficiently lubricated. The life prediction can be completed by adjusting the amount and temperature of the lubricating oil entering the test bearing seat. The dynamic torque sensor is added to measure the speed and torque of the shaft to determine the bearing status.

[0014] 2. The rolling bearing life tester measures the loading force in real time by adding radial and axial force sensors. Compared with the force converted by measuring the hydraulic oil pressure, the loading force measured by the force sensor is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 For this utility model Figure 1 Look at the structural diagram;

[0017] Figure 3 For this utility model Figure 1 Schematic diagram of the structure from top view;

[0018] Figure 4 It is a schematic diagram of the structure of the misalignment adjustment component of the utility model.

[0019] In the figure: 1. base; 2. motor; 3. torque sensor; 4. bearing seat; 5. radial hydraulic cylinder; 6. test bearing seat; 7. axial hydraulic cylinder; 8. misalignment adjustment assembly; 9. rotating shaft; 10. radial sensor; 11. axial sensor; 14. housing. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-4 A rolling bearing life testing machine in this embodiment includes a base 1 and a box 14, and a testing mechanism is provided on the top of the base 1.

[0022] The testing mechanism includes a motor 2 fixedly installed on the top of the base 1, a torque sensor 3 fixedly installed on the top of the base 1, a bearing seat 4 fixedly installed inside the box 14, a radial hydraulic cylinder 5 fixedly installed on the top of the box 14, a test bearing seat 6 fixedly installed inside the box 14, an axial hydraulic cylinder 7 fixedly installed on the right side of the box 14, a misalignment adjustment component 8 fixedly installed on the bottom inner wall of the box 14, a rotating shaft 9 is rotatably connected to the inner circumferential wall of the bearing seat 4, the output shaft of the motor 2 is connected and installed with the torque sensor 3, a through hole is opened inside the box 14, and the rotating shaft 9 is slidably connected to the inside of the through hole and is adapted in size.

[0023] The left side of the rotating shaft 9 is connected and installed with the torque sensor 3, the outer peripheral wall of the rotating shaft 9 is provided with a bearing retaining ring, the outer wall of the bearing retaining ring is installed with a shaft sleeve end cover, the outer wall of the shaft sleeve end cover is installed with a first cylindrical roller bearing, the outer peripheral wall of the rotating shaft 9 is installed with an angular contact bearing, and the outer peripheral wall of the rotating shaft 9 is installed with two second cylindrical roller bearings. A radial sensor 10 is installed on the top of the test bearing seat 6, and an axial sensor 11 is installed on the right side of the test bearing seat 6. There are two test bearing seats 6. The rotating shaft 9 is located between the two test bearing seats 6, and the right side of the rotating shaft 9 is attached to the left side of the axial sensor 11.

[0024] The bottom of the bottom test bearing seat 6 is connected and installed with the top of the misalignment adjustment assembly 8, the outer wall of the axial sensor 11 is installed with a bearing preloader, the outer wall of the bearing preloader is installed with two tapered roller bearings, the outer walls of the two tapered roller bearings on the opposite sides are installed with a test bearing seat, and the end cover of the test bearing seat is installed on the left side of the test bearing seat.

[0025] The misalignment adjustment component 8 includes a base plate, two side plates are installed on the top of the base plate, two first sliders are slidably connected to the top of the base plate, the top of the first slider is movably connected to the second slider, the top of the second slider is installed with a top plate, the outer wall of the base plate is respectively installed with a rear plate and a front plate, a thrust ball bearing is installed inside the front plate, a screw rod is installed inside the thrust ball bearing, the interior of the front plate is threadedly connected with a hexagonal screw, the outer peripheral wall of the screw rod is threadedly connected with a hexagonal thin nut, the outer peripheral wall of the hexagonal screw is threadedly connected with a hexagonal nut, and a limit plate is installed on the top of the top plate.

[0026] In this embodiment, the misalignment adjustment component 8 rotates the distance between the two first sliders of the screw rod, so that the second slider and the top plate move upward, and finally controls the rise and fall of the test bearing seat 6, simulating the parallel misalignment of the bearing, and adjusts the left and right positions of the top plate by tightening and loosening the bolts, and finally controls the deflection of the lower half of the test bearing. At this time, the bearing seat 4 has an angular deflection around the center of the bearing, simulating the angular misalignment of the bearing. Because the rotating shaft is regarded as a rigid body, the displacement of the bearing seat 4 affects the change of the preload force of the bearing 9. These two methods are used to simulate the installation failure of the bearing caused by parallel misalignment, angular misalignment, etc. during installation.

[0027] The working principle of the above embodiment is:

[0028] The motor 2 drives the dynamic torque sensor 3, and the dynamic torque sensor 3 drives the rotating shaft 9 to rotate the test bearing to simulate the bearing operation. The radial hydraulic cylinder 5 and the axial hydraulic cylinder 7 loading devices apply loading force to simulate the load on the bearing. The installation errors in the height, horizontal and angular directions of the test bearing can be adjusted through the misalignment adjustment component 8. The life prediction of the bearing is started by comprehensively considering the speed, load, installation condition and lubrication condition. The feedback data of the vibration, temperature, speed and torque sensor 3 installed on the test bench are recorded in real time for analysis, and the life of the corresponding bearing is judged according to the analysis results.

[0029] It should be noted that the standard parts used in the application can be purchased from the market, special-shaped parts can be customized according to the description in the specification and drawings, and the specific connection methods of each part adopt mature bolts, rivets, welding, etc. in the prior art, and conventional means. Machinery, parts and equipment all adopt conventional models in the prior art; plus the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rolling bearing life testing machine, comprising a base (1) and a housing (14), characterized in that: A testing mechanism is provided on the top of the base (1); The testing mechanism comprises a motor (2) fixedly mounted on the top of a base (1); a torque sensor (3) is fixedly mounted on the top of the base (1); a bearing seat (4) is fixedly mounted inside the box (14); a radial hydraulic cylinder (5) is fixedly mounted on the top of the box (14); a test bearing seat (6) is fixedly mounted inside the box (14); an axial hydraulic cylinder (7) is fixedly mounted on the right side of the box (14); a misalignment adjustment component (8) is fixedly mounted on the bottom inner wall of the box (14); a rotating shaft (9) is rotatably connected to the inner peripheral wall of the bearing seat (4); a radial sensor (10) is mounted on the top of the test bearing seat (6); and an axial sensor (11) is mounted on the right side of the test bearing seat (6).

2. A rolling bearing life testing machine according to claim 1, characterized in that: The misalignment adjustment component (8) comprises a base plate, two side plates are installed on the top of the base plate, two first sliders are slidably connected to the top of the base plate, the top of the first slider is movably connected to the second slider, the top of the second slider is installed with a top plate, the outer wall of the base plate is respectively installed with a rear plate and a front plate, a thrust ball bearing is installed inside the front plate, a screw rod is installed inside the thrust ball bearing, the interior of the front plate is threadedly connected with a hexagonal screw, the outer peripheral wall of the screw rod is threadedly connected with a hexagonal thin nut, the outer peripheral wall of the hexagonal screw is threadedly connected with a hexagonal nut, and a limit plate is installed on the top of the top plate.

3. The rolling bearing life testing machine according to claim 1, characterized in that: The outer peripheral wall of the rotating shaft (9) is provided with a bearing retaining ring, the outer wall of the bearing retaining ring is installed with a shaft sleeve end cover, the outer wall of the shaft sleeve end cover is installed with a first cylindrical roller bearing, the outer peripheral wall of the rotating shaft (9) is installed with an angular contact bearing, and the outer peripheral wall of the rotating shaft (9) is installed with two second cylindrical roller bearings.

4. The rolling bearing life testing machine according to claim 1, characterized in that: A bearing preloader is installed on the outer wall of the axial sensor (11), two tapered roller bearings are installed on the outer wall of the bearing preloader, a test bearing seat is installed on the outer walls of the two tapered roller bearings on the opposite sides, and an end cover of the test bearing seat is installed on the left side of the test bearing seat.

5. The rolling bearing life testing machine according to claim 1, characterized in that: The output shaft of the motor (2) is connected and installed with the torque sensor (3), a through hole is provided inside the box (14), the rotating shaft (9) is slidably connected inside the through hole and is of a matching size, and the left side of the rotating shaft (9) is connected and installed with the torque sensor (3).

6. The rolling bearing life testing machine according to claim 1, characterized in that: There are two test bearing seats (6), the rotating shaft (9) is located between the two test bearing seats (6), the right side of the rotating shaft (9) is attached to the left side of the axial sensor (11), and the bottom of the test bearing seat (6) is connected and installed with the top of the misalignment adjustment component (8).

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