Spindle bearing lubrication reliability test device and method

Abstract

The present invention relates to the technical field of detection equipment, and in particular to a spindle bearing lubrication reliability test device and method, comprising a power unit for driving the inner and outer rings of the bearing to rotate, a loading unit for providing load to the bearing, and a detection unit for detecting the oil film thickness in the bearing; the power unit comprises a worm and two turbines used in conjunction with the worm, each turbine is relatively provided with a transmission wheel, and the turbine and the transmission wheel are transmitted through a transmission shaft, and the two transmission wheels are respectively used to provide rotational power to the inner and outer rings of the bearing; by making the inner and outer rings of the bearing perform various forms of movement, the purpose of testing the bearing under different working conditions can be achieved, which effectively improves the accuracy of the detection and the comprehensiveness of the test, facilitates matching different lubricants for bearings under different working conditions, and can conveniently optimize the lubricant replenishment cycle under different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, in particular to a spindle bearing lubrication reliability test device and method. Background Art

[0002] With the rapid development of high-end equipment manufacturing industry, electric spindles, core components in CNC machine tools, aerospace engines, new energy vehicle drive systems and other fields, are evolving towards high speed, high precision and high reliability. As the supporting core of the spindle, the lubrication performance of the bearing directly determines the life, energy consumption and operation stability of the spindle.

[0003] The movement forms of bearings in real applications are complex and diverse. The forces and movement states of the inner and outer rings directly affect the distribution of the lubricating film, frictional heat accumulation, and fatigue life. For example, in scenarios such as wind turbine main shafts and aircraft engine rotors, it is mainly the outer ring of the bearing that rotates. In complex transmission systems such as gearboxes and differentials, both the inner and outer rings of the bearing generally rotate. In machine tool spindles, it is mainly the inner ring of the bearing that rotates. Therefore, the detection of bearing lubricity requires multiple forms of testing based on actual conditions. Traditional testing methods only test the inner or outer ring of the bearing, and the corresponding outer or inner ring of the bearing is fixed during testing. This testing method is relatively one-sided and some problems are concealed. For example, when the outer ring rotates, the centrifugal force has a more significant impact on the migration of the lubricating fluid. The sliding friction between the rolling elements and the raceway is intensified under the differential rotation of the inner and outer rings, accelerating wear. When the relative motion direction of the inner and outer rings changes, the internal stress distribution of the bearing differs. Summary of the Invention

[0004] The present invention provides a spindle bearing lubrication reliability test device and method, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The spindle bearing lubrication reliability test device includes a power unit for driving the inner and outer rings of the bearing to rotate, a loading unit for providing load to the bearing, and a detection unit for detecting the thickness of the oil film in the bearing;

[0007] The power unit includes a worm and two turbines used in conjunction with the worm, each turbine is provided with a transmission wheel opposite to the other, and the turbine and the transmission wheel are driven by a transmission shaft, and the two transmission wheels are used to provide rotational power to the inner and outer rings of the bearing respectively;

[0008] The turbine and the worm are meshingly connected or separated from each other, and the power unit further includes a locking portion for fixing the turbine in a separated state.

[0009] In some embodiments of the present invention, the locking portion includes a support platform and a plurality of racks mounted on the support platform, and the racks are used to engage with the turbine.

[0010] In some embodiments of the present invention, the turbine is movable in a direction perpendicular to the worm axis and away from the worm.

[0011] In some embodiments of the present invention, a linear guide rail is fixed on the support platform, a movable platform is slidingly arranged on the linear guide rail, the transmission shaft is rotatably installed on the movable platform, and a pushing unit 1 for providing power for the movement of the movable platform is arranged on the support platform.

[0012] In some embodiments of the present invention, the moving direction of the movable platform on the linear guide rail is parallel to the axis of the transmission shaft, and the position of the turbine in the circumferential direction of the worm can be adjusted.

[0013] In some embodiments of the present invention, the power unit further includes two arc-shaped guide rails in opposite directions, and the arc-shaped guide rails are coaxial with the worm, and the support platform is slidably mounted on the arc-shaped guide rails;

[0014] A second pushing unit is relatively fixed between the two arc-shaped guide rails, and two oblique arms are relatively provided at the movable end of the pushing unit, and the two oblique arms are rotatably connected to the two support platforms respectively;

[0015] Wherein, the circumferential outer wall of the transmission wheel is in the shape of an arc surface.

[0016] In some embodiments of the present invention, the test device further comprises a machine platform and a main motor mounted on the machine platform;

[0017] The power part, the loading part and the detection part are arranged in multiple groups, and the worms in the multiple groups of power parts are coaxially arranged and connected in sequence. The main motor is used to provide power for the worms.

[0018] In some embodiments of the present invention, the detection unit includes a conductive layer provided on the outer wall of each of the transmission wheels and a conductive sheet in sliding contact with the conductive layer, the conductive sheet being fixed to the corresponding movable platform, and the two conductive layers are respectively in press contact with and electrically connected to the inner and outer rings of the bearing, so that a capacitor is formed between the inner and outer rings of the bearing;

[0019] The detection unit further includes a capacitance detector for detecting capacitance strength.

[0020] In some embodiments of the present invention, the loading part includes a support frame 1 and a support frame 2 that can move relative to each other, and rollers are provided at both ends of the support frame 1 and both ends of the support frame 2, and the rollers are used to provide axial loads for the bearings. The rollers on the support frame 1 and the rollers on the support frame 2 are respectively used to squeeze the inner and outer rings of the bearings, and the support frame 1 and the support frame 2 respectively provide moving power through two pushing units 3.

[0021] The spindle bearing lubrication reliability test method, based on the above-mentioned spindle bearing lubrication reliability test device, includes the following steps:

[0022] Fixing multiple bearings on each loading part respectively;

[0023] Adjust the positions of the two transmission wheels in each power unit so that the inner and outer rings of each bearing can move in the following states: inner ring moves, outer ring moves, inner and outer rings move in the same direction with different speeds, and inner and outer rings move in opposite directions.

[0024] Run the main motor to make the inner ring and / or outer ring of the corresponding bearing rotate;

[0025] The lubricating fluid is added to the gap between the inner and outer rings of each bearing through the tube, and the rolling elements carry the lubricating fluid and apply it between the inner and outer rings;

[0026] Applying load to the bearing using a loading part;

[0027] The inner and outer rings of the bearing are energized, and the oil film is used as the electrolyte. The capacitance strength between the inner and outer rings of the bearing is detected by the detection unit, thereby calculating the oil film thickness.

[0028] When different lubricating fluids need to be tested, the operating states of the bearings are consistent, and different lubricating fluids are applied to the bearings, and the above-mentioned testing process is repeated.

[0029] The technical solution of the present invention can achieve the following technical effects:

[0030] By making the inner and outer rings of the bearing perform various forms of movement, the purpose of testing the bearing under different working conditions can be achieved, which effectively improves the accuracy of the detection and the comprehensiveness of the test, makes it convenient to match different lubricants for bearings under different working conditions, and can facilitate the optimization of the lubricant replenishment cycle under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 yes Figure 1 Schematic diagram of the explosion structure;

[0034] Figure 3 2 is a schematic structural diagram of a power unit according to an embodiment of the present invention;

[0035] Figure 4 1 is a schematic structural diagram of an arc guide rail according to an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of a bearing and a structure thereon in an embodiment of the present invention;

[0037] Figure 6 2 is a schematic structural diagram of a loading unit in an embodiment of the present invention.

[0038] Reference numerals:

[0039] 100. Power unit; 101. Worm; 102. Turbine; 103. Drive shaft; 104. Drive wheel; 105. Support platform; 106. Rack; 107. Linear guide; 108. Moving platform; 109. Pushing unit 1; 110. Arc guide; 111. Pushing unit 2; 112. Slant arm;

[0040] 200, loading unit; 201, support frame 1; 202, support frame 2; 203, roller; 204, pushing unit 3; 205, pushing unit 4; 206, side push roller;

[0041] 300, detection unit; 301, conductive layer; 302, conductive sheet; 303, capacitance detector;

[0042] 400, bearings;

[0043] 500. Pipe body;

[0044] 600, machine; 601, main motor. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] Example 1

[0048] like Figures 1 to 4 As shown, the spindle bearing lubrication reliability test device of the present invention includes a power unit 100 for driving the inner and outer rings of the bearing 400 to rotate, a loading unit 200 for providing a load to the bearing 400, and a detection unit 300 for detecting the thickness of the oil film in the bearing 400;

[0049] The power unit 100 includes a worm 101 and two turbines 102 used in conjunction with the worm 101. A transmission wheel 104 is provided on each turbine 102. The transmission shaft 103 drives the transmission wheels 104 and the worms 102. The transmission wheels 104 are used to provide rotational power to the inner and outer rings of the bearing 400.

[0050] The turbine 102 and the worm 101 are meshed and connected or separated from each other, and the power unit 100 further includes a locking portion for fixing the turbine 102 in a separated state;

[0051] In the present invention, the power unit 100 is mainly used to provide different forms of power for the rotation of the inner and outer rings of the bearing 400, so that it can perform multiple forms of operation. For example, when the worm 101 in the power unit 100 rotates forward, the worm 101 drives the two turbines 102 thereon to rotate forward synchronously. At this time, the two turbines 102 drive the two transmission wheels 104 to rotate forward synchronously through the two transmission shafts 103. The two transmission wheels 104 are respectively located on the outer side and the inner side of the bearing 400, that is, the two transmission wheels 104 are respectively in contact with the outer wall of the outer ring and the inner wall of the inner ring of the bearing 400, thereby causing the two transmission wheels 104 to drive The inner and outer rings of the bearing 400 rotate synchronously in the same direction, and because the rotation radius of the inner and outer rings is different, the inner and outer rings perform forward synchronous differential motion, and the rolling elements between the inner and outer rings roll in the raceway; when the worm 101 rotates in the opposite direction, the inner and outer rings on the bearing 400 perform reverse synchronous differential motion; when the turbine 102 on the transmission wheel 104 outside the bearing 400 is separated from the worm 101, and the turbine 102 is fixed by the corresponding locking part, the transmission wheel 104 cannot rotate at this time, and the transmission wheel 104 is still in contact with the outer ring of the bearing 400. Due to the friction of the transmission wheel 104, the inner ring of the bearing 400 rotates, and the rotation direction of the inner ring is limited by the rotation direction of the worm 101. That is, at this time, the bearing 400 only performs the test and detection work of the inner ring rotation, and the inner ring can rotate forward or reverse; when the turbine 102 on the transmission wheel 104 inside the bearing 400 is separated from the worm 101, the corresponding locking part fixes the turbine 102. At this time, the bearing 400 only performs the test and detection work of the outer ring rotation, and the outer ring can rotate forward or reverse; based on the above content, it can be achieved Multiple forms of movement of the inner and outer rings of the bearing 400; in some embodiments, the two turbines 102 can also be set on the same side of the worm 101, so that the two turbines 102 can rotate in the same direction. In combination with the transmission shaft 103 and the transmission wheel 104, the two transmission wheels 104 can rotate in the same direction. Since the two transmission wheels 104 act on the inner and outer rings of the bearing 400 respectively, the movement directions of the inner and outer rings of the bearing 400 can be opposite. Of course, to facilitate kinetic energy transmission, multiple transmission shafts 103 and multiple couplings can be used to adjust the kinetic energy transmission direction;

[0052] Since the transmission wheel 104 on the turbine 102 needs to maintain contact with the inner ring or outer ring of the bearing 400 when the turbine 102 moves, the moving distance of the turbine 102 or the width of the transmission wheel 104 can be set. When the turbine 102 is separated from the worm 101, the transmission wheel 104 maintains contact with the bearing 400. Of course, in some embodiments, the position of the transmission wheel 104 can also be relatively fixed. The transmission shaft 103 is in the form of a telescopic rod, and the fixed end of the telescopic rod is connected to the transmission wheel 104, and the movable end of the telescopic rod is connected to the turbine 102. Therefore, when the turbine 102 moves, the position of the transmission wheel 104 remains unchanged.

[0053] The loading unit 200 is primarily used to apply a load to the bearing 400, simulating normal operating conditions during testing to improve test accuracy. The loading unit 200 applies loads to the bearing 400 in both radial and axial directions. The detection unit 300 detects the oil film thickness within the bearing 400 to verify the reliability of the lubricant. Certainly, in some testing processes, multiple bearings 400 of the same specification may be tested with different lubricants to verify the lubricating effect and reliability of different lubricants under different operating conditions of the bearing 400.

[0054] During use, the bearing 400 is fixed on the loading part 200, and the lubricating liquid is injected into the bearing 400 through the tube body 500. During the injection process, the bearing 400 can be kept in a rotating state to facilitate the rolling element to carry the lubricating liquid and smear it in the raceway. It can also be applied manually. The two transmission wheels 104 are in contact with the inner and outer rings of the bearing 400 respectively. When the worm 101 runs, it will drive the inner and outer rings of the bearing 400 to run through the two turbines 102 and the two transmission wheels 104. Then the loading part 200 provides a load to the bearing 400, so that the bearing 400 simulates the actual use condition. The thickness of the oil film in the bearing 400 is detected by the detection part 300. As the running time of the bearing 400 increases, the thickness of the oil film gradually decreases, thereby realizing the reliability detection of the oil film of the bearing 400. Based on the multi-form movement mode of the bearing 400, a variety of reliability tests can be realized, thereby improving the comprehensiveness of the detection and facilitating the selection of different lubricating liquids for different use environments of the bearing 400.

[0055] It should be noted that the above-mentioned test can accurately assess the lubricant consumption cycle, thereby facilitating the adjustment and optimization of the lubricant replenishment cycle. Since temperature, vibration, and other factors have a significant impact on the oil film during actual use, auxiliary equipment such as a thermometer, an oscillation detector, and a central control box can be installed during the test to improve the accuracy and convenience of the test. Of course, if the lubricant needs to be tested during or after the test, the lubricant can also be sampled using a pipette, scraper, etc. and subsequently analyzed. The contact point between the transmission wheel 104 on the inner side of the bearing 400 and the inner ring can be located near the outer transmission wheel 104, or located away from the outer transmission wheel 104, or at any other position on the inner ring, as long as power transmission can be achieved.

[0056] To improve the comprehensiveness of the detection, when abnormal temperature rise or vibration of the bearing 400 is detected, its lubrication failure is detected. When metal debris is shed from the bearing 400, abnormal wear is present inside the bearing 400, and the bearing 400 can be determined to have fatigue failure.

[0057] By making the inner and outer rings of the bearing 400 perform various forms of movement, the purpose of testing and inspecting the bearing 400 under different working conditions can be achieved, effectively improving the accuracy of the detection and the comprehensiveness of the test, making it convenient to match different lubricants for the bearing 400 under different working conditions, and conveniently optimizing the lubricant replenishment cycle under different working conditions; for problems such as the influence of centrifugal force on the migration of the lubricant when the outer ring of the bearing 400 rotates, the increased sliding friction between the rolling elements and the raceway under the differential rotation of the inner and outer rings, the accelerated wear phenomenon, and the difference in stress distribution inside the bearing when the relative movement direction of the inner and outer rings changes, different types of lubricants can be selected in a targeted manner to solve or improve the above problems or phenomena, thereby increasing the service life of the bearing.

[0058] Based on the above implementation, Figure 4 As shown, the locking portion includes a support platform 105 and a plurality of racks 106 mounted on the support platform 105 , and the racks 106 are used to engage with the turbine 102 ;

[0059] When the turbine 102 moves, the rack 106 is located on its moving path, so that the teeth on the turbine 102 can engage with the teeth on the rack 106. At this time, the rack 106 can achieve a locking effect on the turbine 102; since the teeth on the turbine 102 are worm teeth, the corresponding teeth on the rack 106 are also worm teeth; in order to facilitate the smooth engagement of the turbine 102 and the rack 106, the end of the worm teeth on the turbine 102 facing the rack 106 and the end of the worm teeth on the rack 106 facing the turbine 102 can both be set to a cone shape to facilitate the smooth insertion of the turbine 102 and the rack 106.

[0060] Since when the turbine 102 is separated from the worm 101, it is only necessary to ensure that the turbine 102 and the worm 101 are out of transmission relationship and the transmission wheel 104 remains in contact with the bearing 400, there is no restriction on the moving direction of the turbine 102, that is, the turbine 102 can move in a direction perpendicular to the axis of the worm 101 and away from the worm 101; the specific movement mode of the turbine 102 can be to move along the axis of the transmission shaft 103, or move in a direction perpendicular to the axis of the transmission shaft 103 and the axis of the worm 101, or move in a direction perpendicular to the axis of the worm 101 and inclined relative to the axis of the transmission shaft 103, as long as the turbine 102 can be smoothly separated from the worm 101 and can be smoothly re-engaged; since the moving direction of the turbine 102 can be selected in multiple directions, the position of the rack 106 needs to be adjusted and correspond to the turbine 102.

[0061] Based on the above implementation, Figure 4As shown, a linear guide rail 107 is fixed on the support platform 105, a moving platform 108 is slidably provided on the linear guide rail 107, the transmission shaft 103 is rotatably mounted on the moving platform 108, and a pushing unit 109 for providing power for the movement of the moving platform 108 is provided on the support platform 105;

[0062] The support platform 105 can provide support for the linear guide rail 107, which is used to provide support and guidance for the movable platform 108. The movable platform 108 is used to provide support for the transmission shaft 103. The driving unit 109 is used to provide power for the movement of the movable platform 108, thereby achieving the purpose of providing guidance and power for the movement of the turbine 102.

[0063] In some embodiments, when the transmission shaft 103 is a telescopic rod structure, its fixed end can be fixed relative to the linear guide rail 107, and its movable end can pass through the moving platform 108 and connect to the turbine 102. Of course, it can also be used as Figure 4 In the manner shown, the transmission shaft 103 is directly mounted on the moving platform 108 , and the transmission wheel 104 is allowed to move synchronously with the turbine 102 , but the transmission wheel 104 needs to always maintain a contact transmission state with the bearing 400 .

[0064] Since the specifications of the main shaft vary, the specifications of the bearing 400 also vary. When testing different bearings 400, the distance between the two transmission wheels 104 needs to be adjustable. That is, the moving direction of the movable platform 108 on the linear guide 107 is parallel to the axis of the transmission shaft 103, and the position of the turbine 102 in the circumferential direction of the worm 101 can be adjusted.

[0065] When the turbine 102 moves in the circumferential direction of the worm 101, the structures corresponding to the turbine 102, such as the support platform 105, the rack 106, the linear guide 107, the movable platform 108 and the transmission wheel 104, will move synchronously. At this time, the distance between the two transmission wheels 104 changes, and the turbine 102 and the worm 101 can maintain a meshing relationship, thereby improving the functionality of the test and detection; and in order to enable the turbine 102 to move in the circumferential direction of the worm 101 and to be separated from the worm 101, it is necessary to limit the moving direction of the turbine 102 when the turbine 102 is separated from the worm 101, and the turbine 102 cannot move at will, so the turbine 102 can only move along the axial direction of the transmission shaft 103.

[0066] Based on the above implementation, Figure 4 As shown, the power unit 100 further includes two arc-shaped guide rails 110 in opposite directions, and the arc-shaped guide rails 110 are coaxial with the worm 101, and the support platform 105 is slidably mounted on the arc-shaped guide rails 110;

[0067] Among them, a pushing unit 2 111 is relatively fixed between the two arc-shaped guide rails 110, and two oblique arms 112 are relatively provided at the movable ends of the pushing unit 2 111, and the two oblique arms 112 are respectively rotatably connected to the two support platforms 105;

[0068] The outer wall of the transmission wheel 104 is in the shape of an arc surface;

[0069] Since the arc guide rail 110 is coaxial with the worm 101, the support platform 105 moves in the circumferential direction of the worm 101 when it moves, thereby allowing the turbine 102 to move in the circumferential direction of the worm 101, and the movement of the support platform 105 does not affect the sliding of the movable platform 108 on the linear guide rail 107, so that the turbine 102 can also meet the design requirements of being separated from the worm 101; when it is necessary to transmit bearings 400 of different specifications, at least one of the two transmission wheels 104 is displaced, that is, any one of the transmission wheels 104 is allowed to move. In order to adjust the distance between the two transmission wheels 104, both transmission wheels 104 can be moved to adjust the distance between the two transmission wheels 104. When both transmission wheels 104 are able to move, the moving distance of each transmission wheel 104 can be smaller than the distance when only one transmission wheel 104 is moved, thereby increasing the adjustment range. In order to keep the two transmission wheels 104 at the same height, it is necessary to make the two support platforms 105 move synchronously. By using the arrangement of the second pushing unit 111 and the two oblique arms 112, the synchronous movement effect of the two support platforms 105 can be achieved.

[0070] Since the turbine 102 and the support platform 105 can move in a circular direction around the worm 101, the transmission wheel 104 will be tilted relative to the bearing 400. In order to ensure that the transmission wheel 104 can maintain a stable contact transmission effect with the bearing 400, the circumferential outer wall of the transmission wheel 104 can be set to an arc surface.

[0071] Optimizing the above implementation, the test device further includes a machine 600 and a main motor 601 mounted on the machine 600;

[0072] The power unit 100, the loading unit 200 and the detection unit 300 are arranged in multiple groups, and the worms 101 in the multiple groups of power units 100 are coaxially arranged and connected in sequence. The main motor 601 is used to provide power for the worms 101;

[0073] In the present invention, the machine platform 600 can provide a mounting location for the test device, and the main motor 601 can provide power for the multiple worms 101 arranged in an array, thereby enabling the multiple worms 101 to move synchronously, thereby achieving the effect of simultaneously testing multiple bearings 400. When different lubricants need to be tested, multiple bearings 400 of the same specification can be simultaneously assembled on multiple loading units 200 and tested. In this way, the reliability of different lubricants can be directly tested simultaneously, rather than having to test only one bearing 400 and one lubricant at a time as in traditional methods. This simultaneous testing method can make the comparison of test data more intuitive and accurate, eliminating the need for repeated data recording. In addition, during the testing process, rapid judgments can be made based on the consumption of different lubricants, eliminating the need for long-term testing. In other words, this comparative and synchronous testing method can directly determine the lubricant consumption trend and comparison within a period of time. This not only shortens the time for simultaneous testing of multiple bearings 400, but also shortens the testing cycle. Of course, in some embodiments, long-term testing is required to test the reliability of a single lubricant, which can also be implemented in the present invention.

[0074] When testing the oil film thickness, the common methods are to stop the machine for testing, or to use the current to break through the oil film for non-stop testing. The first method mentioned above will cause the test to be interrupted, and the second method will cause electric shock loss of the oil film, affecting the test accuracy. Therefore, in order to achieve the oil film thickness detection without stopping the machine and protecting the oil film, the capacitance method can be used. Specifically, Figures 4 and 5 As shown, the detection unit 300 includes a conductive layer 301 provided on the outer wall of each transmission wheel 104 and a conductive sheet 302 in sliding contact with the conductive layer 301. The conductive sheet 302 is fixed to the corresponding moving platform 108. The two conductive layers 301 are respectively in press contact with the inner and outer rings of the bearing 400 and are electrically connected, so that a capacitor is formed between the inner and outer rings of the bearing 400.

[0075] The detection unit 300 further includes a capacitance detector 303 for detecting capacitance strength;

[0076] In the present invention, the conductive layer 301 can be directly wrapped around the transmission wheel 104, or the transmission wheel 104 can be formed into a wire shape by depositing or applying a conductive metal. The conductive sheet 302 is fixed to the movable platform 108 and needs to be in contact with the conductive layer 301. This allows the conductive layer 301 to be connected to an external power source to realize power supply to the conductive layer 301. When the conductive layers 301 on the two transmission wheels 104 respectively power the inner and outer rings of the bearing 400, an electric field is formed between the inner and outer rings of the bearing 400, that is, the inner and outer rings of the bearing 400 form a capacitor structure. The capacitance value is then detected by the capacitance detector 303, thereby realizing the detection of the oil film thickness.

[0077] It should be pointed out that due to the existence of rolling elements, current will flow through the rolling elements, thereby destroying the capacitor structure composed of the inner and outer rings. At this time, an insulating layer can be applied to the rolling elements and raceways to isolate the current, or high-frequency excitation can be used. High-frequency alternating current can be used to utilize the "skin effect" of the conductor to reduce the conduction of current by the rolling elements. That is, under high frequency, the current is concentrated on the surface of the conductor, the actual conducting cross-sectional area of ​​the rolling elements is small, and the impedance is increased, thereby realizing the detection of the oil film thickness. Of course, the oil film thickness can also be calculated by compensation according to the frequency of the alternating current.

[0078] Optimized to the above implementation, such as Figures 5 and 6 As shown, the loading part 200 includes a support frame 1 201 and a support frame 2 202 that can move relative to each other, and rollers 203 are provided at both ends of the support frame 1 201 and the support frame 2 202. The rollers 203 are used to provide axial loads for the bearing 400. The rollers 203 on the support frame 1 201 and the rollers 203 on the support frame 2 202 are used to squeeze the inner and outer rings of the bearing 400, respectively. The support frame 1 201 and the support frame 2 202 are respectively provided with moving power through two pushing units 3 204.

[0079] In the present invention, the above structure provides an axial load. That is, when one push unit 3 204 extends and the other push unit 3 204 contracts, the rollers 203 on the opposing support frame 1 201 act on the outer ring of the bearing 400, and the rollers 203 on the support frame 202 act on the inner ring of the bearing 400. The inner and outer rings are subjected to opposite forces, thereby achieving the purpose of providing an axial load on the bearing.

[0080] In actual use, the distance between the two rollers 203 on the support frame 1 201 or the support frame 202 is greater than the thickness of the bearing 400, so that the bearing 400 can be easily inserted between the support frame 1 201 and the support frame 2 202. When the bearing 400 needs to be fixed, one pushing unit 3 204 can be extended and the other pushing unit 3 204 can be shortened, so that the support frame 1 201 and the support frame 2 202 can move alternately and the corresponding rollers 203 can be used to squeeze and fix the inner and outer rings of the bearings.

[0081] In some embodiments, since the bearing 400 needs to bear a radial load, the loading part 200 may further include a pushing unit 205 and a side push roller 206 for providing a radial load to the bearing 400. The side push roller 206 is installed on the movable end of the pushing unit 205. The pushing unit 205 may push the side push roller 206 to act on the outer ring or inner ring of the bearing 400, thereby providing a radial load to the bearing 400. Figure 5 For example, the side thrust roller 206 acts on the outer ring of the bearing 400;

[0082] The pushing unit 3 204 and the pushing unit 4 205 are both fixed relative to the machine 600 .

[0083] Example 2

[0084] The spindle bearing lubrication reliability test method, based on the above-mentioned spindle bearing lubrication reliability test device, includes the following steps:

[0085] Fixing a plurality of bearings 400 on each loading part 200 respectively;

[0086] Adjust the positions of the two transmission wheels 104 in each power unit 100 so that the inner and outer rings of each bearing 400 respectively move in the inner ring, then the outer ring, then the inner and outer rings move in the same direction with a differential speed, and finally the inner and outer rings move in opposite directions.

[0087] Running the main motor 601 to rotate the inner ring and / or outer ring of the corresponding bearing 400;

[0088] Lubricating fluid is added to the gap between the inner and outer rings of each bearing 400 through the tube 500, and the rolling elements carry the lubricating fluid and apply it between the inner and outer rings;

[0089] Applying a load to the bearing 400 using the loading unit 200;

[0090] The inner and outer rings of the bearing 400 are energized, and the oil film is used as the electrolyte. The capacitance strength between the inner and outer rings of the bearing 400 is detected by the detection unit 300 to calculate the thickness of the oil film.

[0091] When different lubricating fluids need to be tested, the operating states of the bearings 400 are consistent, and different lubricating fluids are applied to each bearing 400, and the above-mentioned testing process is repeated;

[0092] By using the above method, the oil film reliability test of the bearing 400 under different working conditions can be realized, and the reliability detection of different oil films can also be realized. Compared with the traditional method, the detection is more comprehensive and more accurate.

[0093] It should be pointed out that the propulsion units in this case can be any structure such as a cylinder, an oil cylinder, an electromagnetic propeller, a propulsion motor, etc., which can be selected according to assembly requirements, and the structural dimensions, specifications, strength, materials, etc. in this case can be determined according to actual needs, which will not be elaborated here.

[0094] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Spindle bearing lubrication reliability test device, characterized in that: It includes a power unit for driving the inner and outer rings of the bearing to rotate, a loading unit for providing load to the bearing, and a detection unit for detecting the thickness of the oil film in the bearing; The power unit includes a worm and two turbines used in conjunction with the worm, each turbine is provided with a transmission wheel opposite to the other, and the turbine and the transmission wheel are driven by a transmission shaft, and the two transmission wheels are used to provide rotational power to the inner and outer rings of the bearing respectively; The turbine and the worm are meshed and connected or separated from each other, and the power unit further includes a locking portion for fixing the turbine in a separated state; The locking portion includes a support platform and a plurality of racks mounted on the support platform, wherein the racks are used to engage with the turbine; A linear guide rail is fixed on the support platform, a moving platform is slidably arranged on the linear guide rail, the transmission shaft is rotatably mounted on the moving platform, and a pushing unit 1 for providing power for the movement of the moving platform is provided on the support platform; The moving direction of the movable platform on the linear guide rail is parallel to the axis of the transmission shaft, and the position of the turbine in the circumferential direction of the worm can be adjusted; The power unit further includes two arc-shaped guide rails in opposite directions, and the arc-shaped guide rails are coaxial with the worm, and the support platform is slidably mounted on the arc-shaped guide rails; A second pushing unit is relatively fixed between the two arc-shaped guide rails, and two oblique arms are relatively provided at the movable end of the pushing unit, and the two oblique arms are rotatably connected to the two support platforms respectively; Wherein, the outer circumferential wall of the transmission wheel is in the shape of an arc surface; The test device also includes a machine platform and a main motor installed on the machine platform; The power unit, the loading unit, and the detection unit are arranged in multiple groups, and the worms in the multiple groups of power units are coaxially arranged and connected in sequence, and the main motor is used to provide power to the worms; The detection unit includes a conductive layer provided on the outer wall of each transmission wheel and a conductive sheet in sliding contact with the conductive layer, wherein the conductive sheet is fixed to the corresponding movable platform, and the two conductive layers are respectively in press contact with the inner and outer rings of the bearing and electrically connected, so that a capacitor is formed between the inner and outer rings of the bearing; The detection unit further includes a capacitance detector for detecting capacitance strength.

2. The spindle bearing lubrication reliability test device according to claim 1, characterized in that: The worm gear is movable in a direction perpendicular to the worm axis and away from the worm.

3. The spindle bearing lubrication reliability test device according to claim 1, characterized in that: The loading part includes a support frame 1 and a support frame 2 that can move relative to each other, and rollers are provided at both ends of the support frame 1 and the two ends of the support frame 2. The rollers are used to provide axial loads for the bearings. The rollers on the support frame 1 and the rollers on the support frame 2 are respectively used to squeeze the inner and outer rings of the bearings. The support frame 1 and the support frame 2 respectively provide moving power through two pushing units 3.

4. A spindle bearing lubrication reliability test method, applicable to the spindle bearing lubrication reliability test device according to any one of claims 1 to 3, characterized in that it comprises the following steps: Fixing multiple bearings on each loading part respectively; Adjust the positions of the two transmission wheels in each power unit so that the inner and outer rings of each bearing can move in the following states: inner ring moves, outer ring moves, inner and outer rings move in the same direction with different speeds, and inner and outer rings move in opposite directions. Run the main motor to make the inner ring and / or outer ring of the corresponding bearing rotate; The lubricating fluid is added to the gap between the inner and outer rings of each bearing through the tube, and the rolling elements carry the lubricating fluid and apply it between the inner and outer rings; Applying load to the bearing using a loading part; The inner and outer rings of the bearing are energized, and the oil film is used as the electrolyte. The capacitance strength between the inner and outer rings of the bearing is detected by the detection unit, thereby calculating the oil film thickness. When different lubricating fluids need to be tested, the operating states of the bearings are consistent, and different lubricating fluids are applied to the bearings, and the above-mentioned testing process is repeated.

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