Bearing lubricating grease film thickness measurement test device and method

Abstract

The invention discloses a bearing lubricating grease film thickness measurement test device and method, and relates to the technical field of mechanical device tests.The bearing lubricating grease film thickness measurement test device comprises a test box and a supporting table, a disc driving mechanism is arranged in the test box, and a ball driving mechanism is arranged on the supporting table; the ball driving mechanism comprises a ball rotation driving mechanism and a ball movement driving mechanism, the ball movement driving mechanism is further provided with a longitudinal load loading mechanism and a supporting mechanism used for placing balls, the supporting table is provided with an optical measurement system, and the test box is further provided with an environment simulation system. The balls and the glass disc are extruded through the longitudinal load loading mechanism, lubricating grease is smeared on the lower portion of the glass disc, the loaded condition and the working condition of the lubricating grease in the main shaft bearing are truly reduced as much as possible, and the film thickness parameter of the lubricating grease is obtained under the action of the optical measurement system. Therefore, real-time monitoring and recording of the film thickness of the test lubricating grease are realized.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical device testing, and in particular to a grease oil film thickness measurement test device and method for bearings. Background Art

[0002] In order to meet the development needs of aerospace, marine equipment and machine tool processing, the research and development of high-end CNC machine tools has been continuously strengthened. As an important component supporting mechanical transmission devices, spindle bearings need to withstand the combined effects of multiple dynamic loads, so the improvement of their comprehensive service performance is crucial to the reliability of machine tool spindles.

[0003] In CNC machine tools, the wear and fatigue degradation of the spindle bearings are the main causes of spindle precision degradation. Grease has good lubrication performance, can reduce bearing wear and improve its load-bearing capacity. Experiments and studies have proved that grease can provide ideal lubrication performance under various working conditions and is the key to optimizing bearing performance and improving its service life. Therefore, in order to ensure that CNC machine tools maintain high precision and reliability, the lubrication and wear conditions of the spindle bearings must be monitored. In the actual working environment, fluctuations in temperature and humidity, changes in load, and the physical and chemical properties of the grease itself may affect the measurement of the oil film thickness, especially under high-speed or variable-speed operating conditions. Accurately measuring the oil film thickness becomes more challenging. In order to meet these challenges, it is an urgent problem for technicians in this field to provide a test device and test method that can simulate the external environmental conditions of grease such as temperature and humidity, oxygen content, salt spray concentration, atmospheric pressure, and the internal mechanical environment of the spindle bearing under complex working conditions to achieve grease reliability evaluation.

[0004] A Chinese patent with application number CN202121867807.7 discloses a high-temperature lubrication performance test device for grease, including an electric heating base and a test box. The test box is arranged on the upper surface of the electric heating base and is connected through a conduit. A test seat and a test frame are arranged inside the test box. A temperature display and a noise detector are plugged into the upper surface of the test box. The detection probes of the temperature display and the noise detector extend into the inside of the test box. When in use, the device monitors the noise of the test piece in real time through the noise detector, so as to obtain the performance of the grease at different temperatures. The Chinese patent application number CN202310962782.6 discloses a grease storage reliability test device for simulating rolling mechanisms, including a test box with a test chamber inside, a constant temperature and humidity loading system and an oxygen concentration control system for adjusting the internal environment of the test chamber, and a test fixture located in the test chamber including a lead screw, a first assembled nut body, a second assembled nut body, a washer, a ball and a ball head. The grease is applied to the closed double arc spiral raceway formed by the two nut bodies. These components together constitute a simulated rolling mechanism for testing the performance of the grease. The preload of the ball is changed by adjusting the tightening torque of the fasteners on the two nut bodies in the test fixture, and the preload borne by the ball screw pair is simulated, thereby simulating the load state of the grease in the rolling spiral mechanism.

[0005] In the above-mentioned prior art, the performance of grease under high temperature conditions is simulated by a heating device, or the load state of grease in a rolling mechanism is simulated. In practical applications, grease often needs to maintain its performance under complex working conditions. The shortcomings of the prior art are that they cannot simulate the performance of grease under the combined action of sliding and rolling, and under the composite loading of multiple physical fields (such as temperature, pressure, oxygen concentration, etc.), thereby failing to simulate the actual working conditions more accurately and failing to evaluate the performance of grease more comprehensively. Summary of the invention

[0006] In order to overcome the above-mentioned defects in the prior art, the present invention provides a bearing grease oil film thickness measurement test device and method capable of measuring the bearing grease oil film thickness.

[0007] To achieve the above object, the present invention provides the following technical solutions: The present invention provides a grease film thickness measurement test device for bearings, comprising a test box and a support table, wherein a disc driving mechanism for driving a glass disc to make reciprocating linear motion and rotational motion is arranged in the test box; a ball driving mechanism for driving a ball to move is arranged on the support table, the ball driving mechanism comprises a ball rotation driving mechanism and a ball movement driving mechanism, and a longitudinal load loading mechanism and a support mechanism for placing the ball are also arranged on the ball movement driving mechanism; an optical measurement system for measuring the grease film thickness is arranged on the support table, the optical measurement system comprises a microscope support frame, a light source box and an image acquisition system, the microscope support frame is installed on the support table, and the light source box and the image acquisition system are arranged on the microscope support frame; an environmental simulation system is also arranged on the test box.

[0008] Preferably, the disc driving mechanism includes a disc supporting rod, a third driving motor and a disc lifting platform for lifting the glass disc, the third driving motor is arranged on the disc lifting platform, one end of the disc supporting rod is connected to the glass disc by a bolt, and the other end of the disc supporting rod is connected to the output end of the third driving motor by a coupling.

[0009] Preferably, the disc lifting platform includes a lifting base, a disc supporting platform, a lifting bent rod, a bent rod fixing block and a height adjustment bolt. The lifting base is fixedly connected to the supporting platform by bolts. The lifting base is symmetrically rotatably connected with two groups of lifting bent rods, each group includes two lifting bent rods, and the two lifting bent rods in each group are rotatably connected with a bent rod fixing block. The threads at both ends of the height adjustment bolt have opposite rotation directions, and the two bent rod fixing blocks are respectively threadedly connected to the two ends of the height adjustment bolt. The disc supporting platform is also symmetrically rotatably connected with two groups of lifting bent rods, and the lifting bent rod connected to the disc supporting platform is rotatably connected to the adjacent bent rod fixing block at one end away from the disc supporting platform, and the third drive motor is fixedly connected to the disc supporting platform by bolts.

[0010] Preferably, the ball moving drive mechanism includes a moving platform, a screw transmission mechanism, a second driving motor and a second motor seat. The screw transmission mechanism is used to drive the moving platform to perform linear motion. The screw transmission mechanism includes a first coupling, a second coupling, a driving screw, a screw support unit, a guide rail and a slider. Two symmetrically arranged guide rails are fixedly connected to the top of the support platform, and a slider is slidably arranged on each guide rail. The moving platform is fixedly connected between the two sliders. The second motor seat is fixedly connected to the support platform by bolts, and the second driving motor is fixedly connected to the second motor seat by bolts. The screw support unit is fixedly connected to the top of the support platform by bolts. The screw support unit is arranged corresponding to the position of the second motor seat. One end of the driving screw is connected to the output end of the second driving motor through the first coupling, and the other end of the driving screw is connected to the screw support unit through the second coupling.

[0011] Preferably, the ball rotation drive mechanism includes a first drive motor, a first motor seat and a ball drive connecting rod. The first motor seat is fixedly connected to the mobile platform by bolts, the first drive motor is fixedly connected to the first motor seat by bolts, one end of the ball drive connecting rod is connected to the output end of the first drive motor through a coupling, and the other end of the ball drive connecting rod is fixed to the ball by a threaded connection.

[0012] Preferably, the longitudinal load loading mechanism includes a ball-supported base plate, a base plate side support seat, a dynamometer and a force applying base. The base plate side support seat is fixedly connected to one side of the mobile platform by bolts, and the side of the mobile platform away from the base plate side support seat is fixedly connected with the dynamometer by bolts. The dynamometer is arranged corresponding to the position of the base plate side support seat, the ball-supported base plate is rotatably connected to the base plate side support seat, and the side of the ball-supported base plate away from the base plate side support seat is fixedly connected to the force applying base by bolts.

[0013] Preferably, a supporting mechanism for placing balls is also provided on the ball support base plate, the supporting mechanism comprising a cam, a ball radius adjustment plate, a movable support roller, a fixed support roller and a support roller mounting platform, the support roller mounting platform is fixedly connected to the ball support base plate by bolts, two fixed support rollers are rotatably connected to the support roller mounting platform, a rotating shaft is fixedly provided on the ball support base plate, the cam is rotatably connected to the rotating shaft on the ball support base plate, a nut is threadedly connected to the rotating shaft, the ball radius adjustment plate is slidably connected to the limiting guide rail on the ball support base plate, and two movable support rollers are rotatably connected to the side of the ball radius adjustment plate away from the cam.

[0014] Preferably, the image acquisition system includes a CCD camera, a microscope, a microscope adjustment mechanism and a microscope longitudinal adjustment bracket, the microscope longitudinal adjustment bracket is connected to the microscope support frame, the microscope adjustment mechanism is installed on the microscope longitudinal adjustment bracket, the microscope is installed on the microscope adjustment mechanism, the light source box is connected to the microscope through an optical fiber tube, and the CCD camera is connected to the eyepiece of the microscope.

[0015] Preferably, the environmental simulation system includes a temperature regulating member, an air pressure sensor, a humidity regulating member, an oxygen concentration sensor, a salt spray concentration sensor, a first spray system and a second spray system arranged in the test box, and a salt spray generator connected to the first spray system, a nitrogen generator and an oxygen generator connected to the second spray system, and a water pump connected to the humidity regulating member are arranged on the outside of the test box.

[0016] The present invention also provides a bearing grease oil film thickness measurement test method, using the bearing grease oil film thickness measurement test device as described above, the method comprises the following steps: Step 1: Determine the specifications, movement form and speed of the ball and glass disc, select the first drive motor, the second drive motor and the third drive motor, and determine the specifications and model of the tested grease; Step 2: Install the disc drive mechanism, calculate the amount of grease to be applied to the glass disc, and evenly spread the bearing grease over the entire lower surface of the glass disc; Step 3: Install the ball drive mechanism, optical measurement system, support mechanism and longitudinal load loading mechanism; Step 4: Set the collection frequency and total test duration of lubricating film thickness, atmospheric pressure, salt spray concentration, oxygen concentration, temperature and humidity parameters, and record the test data of the test grease; Step 5: After the test, turn off the environmental simulation system, turn off the third drive motor and the first drive motor, disassemble the glass disc, collect the test grease and clean the glass disc.

[0017] The present invention has the following beneficial effects: The glass disc and the ball are driven to rotate by the third drive motor and the first drive motor respectively, and the ball is driven to make reciprocating linear motion by the second drive motor. At the same time, the ball is placed between the mobile support roller and the fixed support roller. The longitudinal load loading mechanism squeezes the ball and the glass disc, and grease is applied to the lower part of the glass disc to restore the load and working conditions of the grease in the spindle bearing as realistically as possible. The grease film thickness parameters are obtained under the action of the optical measurement system, so as to realize the real-time monitoring and recording of the test grease film thickness, and then the influence of factors such as load, speed and acceleration on the grease film thickness under different rolling-slip ratios can be analyzed. According to the monitoring results, the grease required by the bearing under different working requirements and working conditions can be scientifically selected, so as to avoid over-lubrication or under-lubrication, which can significantly improve the reliability of the bearing, reduce maintenance costs, and ensure the high efficiency and stability of the equipment during long-term operation.

[0018] The inner wall of the test box is equipped with a nozzle connected to the outer box of the nitrogen generator, oxygen generator and salt spray generator. The test box is also equipped with a temperature regulator, a humidity regulator, an air pressure sensor, a salt spray concentration sensor and an oxygen concentration sensor. These components together constitute an environmental simulation system. The environmental simulation system regulates the temperature, humidity, oxygen concentration, atmospheric pressure and salt spray concentration in the test box, accurately simulating the actual working environment of the bearing grease in service, making the monitoring data more reliable. This device can more accurately measure the oil film thickness of the grease, providing strong data support and technical basis for the next reliability evaluation of the main shaft bearing grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the third driving motor, the disc support platform and the lifting crank rod and other components in the present invention; Figure 3 It is a schematic diagram of the structure of the second drive motor and the second motor base and other components in the present invention; Figure 4 It is a structural schematic diagram of the first driving motor, the first motor seat and the ball-driven connecting rod in the present invention; Figure 5 It is a schematic diagram of the structure of the guide rail, the slider, the second drive motor and other components in the present invention; Figure 6 It is a schematic diagram of the structure of the fixed support roller and the movable support roller and other components in the present invention; Figure 7 It is a schematic diagram of the structure of components such as a force applying base and a dynamometer in the present invention; Figure 8 It is a structural schematic diagram of components such as a microscope adjustment mechanism and a microscope longitudinal adjustment bracket in the present invention; Fig. 9 It is a schematic diagram of the structure of components such as the temperature adjustment element and the air pressure sensor in the present invention.

[0020] In the figure: 1, test box; 2, support table; 301, glass disc; 302, disc support rod; 303, third drive motor; 6, microscope support frame; 7, light source box; 801, CCD camera; 802, microscope; 803, microscope longitudinal adjustment bracket; 901, temperature adjustment member; 902, air pressure sensor; 903, humidity adjustment member; 904, oxygen concentration sensor; 905, salt spray concentration sensor; 906, first spray system; 907, second spray system; 908, salt spray maker; 909, water pump; 910, nitrogen generator; 911, oxygen generator; 1001, lifting base; 1002, disc support table; 1003, lifting curved rod; 1004, curved rod fixing block; 1005 , height adjustment bolt; 1101, first drive motor; 1102, first motor seat; 1103, ball drive connecting rod; 1201, second drive motor; 1202, second motor seat; 1301, cam; 1302, ball radius adjustment plate; 1303, movable support roller; 1304, fixed support roller; 1305, support roller mounting table; 1401, ball support base plate; 1402, base plate side support seat; 1403, dynamometer; 1404, force application base; 1501, first coupling; 1502, second coupling; 1503, drive screw; 1504, screw support unit; 1505, guide rail; 1506, slider; 16, movable platform; 17, microscope adjustment mechanism. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0023] The present application provides a bearing grease film thickness measurement test device, such as Figures 1 to 9 As shown, it includes a test box 1 and a support table 2. The test box 1 is provided with a disc driving mechanism for driving the glass disc 301 to perform reciprocating linear motion and rotational motion; the support table 2 is provided with a ball driving mechanism for driving the ball to move, the ball driving mechanism includes a ball rotation driving mechanism and a ball movement driving mechanism, and the ball movement driving mechanism is also provided with a longitudinal load loading mechanism and a support mechanism for placing the ball; the support table 2 is provided with an optical measuring system for measuring the thickness of the grease film, the optical measuring system includes a microscope support frame 6, a light source box 7 and an image acquisition system, the microscope support frame 6 is connected to the support table 2 by bolts, and the light source box 7 and the image acquisition system are arranged on the microscope support frame 6; the test box 1 is also provided with an environmental simulation system.

[0024] like Figure 1 and Figure 2 As shown, the disc driving mechanism includes a disc supporting rod 302, a third driving motor 303 and a disc lifting platform for lifting the glass disc 301, the disc lifting platform includes a lifting base 1001, a disc supporting platform 1002, a lifting curved rod 1003, a curved rod fixing block 1004 and a height adjusting bolt 1005, the lifting base 1001 is fixedly connected to the supporting platform 2 by bolts, the lifting base 1001 is symmetrically rotatably connected with two groups of lifting curved rods 1003, each group includes two lifting curved rods 1003, and the two lifting curved rods 1003 of each group are rotatably connected with a curved rod fixing block 1004, and the height adjusting bolt 1005 is fixedly connected to the supporting platform 2 by bolts. 05, the threads at both ends have opposite rotation directions, and the two bent rod fixing blocks 1004 are respectively threadedly connected to the two ends of the height adjustment bolt 1005, and the disc support platform 1002 is also symmetrically rotatably connected with two groups of lifting bent rods 1003, and the lifting bent rod 1003 connected to the disc support platform 1002 is rotatably connected to the adjacent bent rod fixing block 1004 at one end away from the disc support platform 1002, and the third drive motor 303 is fixedly connected to the disc support platform 1002 by bolts, one end of the disc support rod 302 is connected to the glass disc 301 by bolts, and the other end of the disc support rod 302 is connected to the output end of the third drive motor 303 through a coupling.

[0025] like Figure 1 , Figure 3 and Figure 5 As shown, the ball moving drive mechanism includes a moving platform 16, a screw transmission mechanism, a second driving motor 1201 and a second motor seat 1202. The screw transmission mechanism is used to drive the moving platform 16 to make a linear motion. The screw transmission mechanism includes a first coupling 1501, a second coupling 1502, a driving screw 1503, a screw support unit 1504, a guide rail 1505 and a slider 1506. The top of the support platform 2 is fixedly connected to two symmetrically arranged guide rails 1505 by bolts. A slider 1506 is slidably arranged on each guide rail 1505, and the two sliders 1506 are connected together. A mobile platform 16 is fixedly connected, the second motor seat 1202 is fixedly connected to the support platform 2 by bolts, the second drive motor 1201 is fixedly connected to the second motor seat 1202 by bolts, the screw support unit 1504 is fixedly connected to the top of the support platform 2 by bolts, the screw support unit 1504 is arranged corresponding to the position of the second motor seat 1202, one end of the drive screw 1503 is connected to the output end of the second drive motor 1201 through the first coupling 1501, and the other end of the drive screw 1503 is connected to the screw support unit 1504 through the second coupling 1502.

[0026] like Figure 1 as well as Figures 3 to 5 As shown, the ball rotation drive mechanism includes a first drive motor 1101, a first motor seat 1102 and a ball drive connecting rod 1103. The first motor seat 1102 is fixedly connected to the mobile platform 16 by bolts, the first drive motor 1101 is fixedly connected to the first motor seat 1102 by bolts, one end of the ball drive connecting rod 1103 is connected to the output end of the first drive motor 1101 through a coupling, and the other end of the ball drive connecting rod 1103 is fixed to the ball by a threaded connection; the first drive motor 1101 drives the ball drive connecting rod 1103 and the ball to perform a rotational motion, thereby realizing the simulation of the ball rolling working condition; the second drive motor 1201 drives the drive screw 1503 to rotate, thereby driving the mobile platform 16 and the ball to perform a linear motion along the guide rail 1505, thereby realizing the simulation of the ball sliding working condition.

[0027] like Figure 1 as well as Figures 3 to 7As shown, the longitudinal load loading mechanism includes a ball-supported base plate 1401, a base plate side support seat 1402, a dynamometer 1403 and a force applying base 1404. The base plate side support seat 1402 is fixedly connected to one side of the mobile platform 16 by bolts. The side of the mobile platform 16 away from the base plate side support seat 1402 is fixedly connected with the dynamometer 1403 by bolts. The dynamometer 1403 is arranged corresponding to the position of the base plate side support seat 1402. The ball-supported base plate 1401 is rotatably connected to the base plate side support seat 1402. The side of the ball support base 1401 away from the base side support seat 1402 is fixedly connected to the force applying base 1404 by bolts. The force applying base 1404 is provided with a rectangular groove, which matches the circular protrusion of the tension hook of the tension gauge 1403. The longitudinal force is provided to the ball through the longitudinal load loading mechanism, that is, the force applying base 1404 is pulled upward by the tension gauge 1403, and the force applying base 1404 drives the ball support base 1401 to rotate upward, so that the extrusion force between the ball and the glass disc 301 becomes larger.

[0028] Further, such as Figure 1 as well as Figures 3 to 6 As shown, a support mechanism for placing balls is also provided on the ball support base plate 1401, and the support mechanism includes a cam 1301, a ball radius adjustment plate 1302, a movable support roller 1303, a fixed support roller 1304 and a support roller mounting platform 1305. The support roller mounting platform 1305 is fixedly connected to the ball support base plate 1401 by bolts, and two fixed support rollers 1304 are rotatably connected to the support roller mounting platform 1305. A rotating shaft is fixedly provided on the ball support base plate 1401, and the cam 1301 is rotatably connected to the rotating shaft on the ball support base plate 1401. A thread is provided on the upper end of the rotating shaft, and a nut is threadedly connected to the rotating shaft. Plate 1302 is slidably connected to the limiting guide rail set on the ball support base plate 1401, the ball radius adjustment plate 1302 is squeezed and matched with the cam 1301, and the ball radius adjustment plate 1302 is rotatably connected to the side away from the cam 1301 with two movable support rollers 1303. By manually driving the cam 1301 to rotate around the rotating shaft, the gap between the movable support roller 1303 and the fixed support roller 1304 can be increased or reduced to replace balls with different radii, so as to realize the simulation of bearing working conditions of different sizes. After the position of the cam 1301 is adjusted, the nut on the rotating shaft is tightened so that the nut is squeezed and matched with the cam 1301, and the cam 1301 is locked and fixed by the nut.

[0029] like Figure 1 and Figure 8As shown, the image acquisition system includes a CCD camera 801, a microscope 802, a microscope adjustment mechanism 17 and a microscope longitudinal adjustment bracket 803. The microscope longitudinal adjustment bracket 803 is fixedly connected to the microscope support frame 6 by bolts, the microscope adjustment mechanism 17 is installed on the microscope longitudinal adjustment bracket 803 by fastening screws, and the microscope 802 is installed on the microscope adjustment mechanism 17 by fastening screws. The microscope adjustment mechanism 17 can realize lateral adjustment and angle adjustment of the microscope 802, and the microscope longitudinal adjustment bracket 803 can realize longitudinal adjustment of the microscope 802. Furthermore, the light source box 7 is connected to the microscope 802 through an optical fiber tube to provide a light source. The CCD camera 801 is connected to the eyepiece of the microscope 802 by threads. The CCD camera 801 can regularly collect the oil film thickness and shape data of the grease to realize the dual-light interference dynamic collection of the aging state of the grease.

[0030] like Figure 1 and Fig. 9 As shown, the environmental simulation system includes a temperature adjustment component 901 and an air pressure sensor 902 arranged on the left side of the test box 1, a humidity adjustment component 903, an oxygen concentration sensor 904, a salt spray concentration sensor 905, a first spray system 906 and a second spray system 907 arranged on the right side of the test box 1, and a salt spray maker 908 connected to the first spray system 906, a nitrogen generator 910 and an oxygen generator 911 connected to the second spray system 907, and a water pump 909 connected to the humidity adjustment component 903 are arranged on the outside of the test box 1.

[0031] Specifically, the temperature regulating member 901 and the humidity regulating member 903 regularly collect and adjust the temperature and humidity inside the test box 1, the air pressure sensor 902, the oxygen concentration sensor 904 and the salt spray concentration sensor 905 regularly collect the atmospheric pressure, oxygen concentration and salt spray concentration inside the test box 1, and adjust them according to the requirements of the bearing working environment simulation, the first spray system 906 and the second spray system 907 are both provided with nine nozzles inside the test box 1, the first spray system 906 and the second spray system 907 are both provided with a threaded pipe joint outside the test box 1, the first spray system 906 is connected to the salt spray maker 908 through a pipeline to adjust the salt spray concentration inside the test box 1, and the second spray system 907 is connected to the nitrogen generator 910 and the oxygen generator 911 through a pipeline to adjust the atmospheric pressure and oxygen concentration inside the test box 1.

[0032] The present invention can simultaneously drive the glass disc 301 and the ball, drive the glass disc 301 to rotate at a constant speed through the third drive motor 303, drive the ball to make a rotary motion through the first drive motor 1101, and drive the ball to make a linear motion through the second drive motor 1201, thereby realizing the simulation of the rolling-slip ratio of the ball in the actual working state in the bearing.

[0033] The test box 1 is a closed structure, which is convenient for the environmental simulation system to adjust and change the environment in the test box 1, so as to make it closer to the actual working condition of the bearing ball. One side of the test box 1 is detachable and is provided with an observation window; the operating speeds of the third drive motor 303 and the first drive motor 1101 can be adjusted, and the sliding speed of the ball can be changed in combination with the change in the distance between the ball and the center of the glass disc 301; the ball is placed between the fixed support roller 1304 and the movable support roller 1303, and grease is applied under the glass disc 301. The grease film thickness parameters are obtained under the dual-light interference dynamic acquisition of the optical measurement system, thereby realizing real-time monitoring of the test grease film thickness, and then reliability evaluation can be performed, and according to the evaluation results, the grease required by the bearing under different working requirements and working conditions can be scientifically selected, thereby avoiding over-lubrication or under-lubrication, which can effectively improve the reliability of the bearing, reduce maintenance costs, and ensure the high efficiency and stability of the equipment during long-term operation.

[0034] The present application also provides a bearing grease oil film thickness measurement test method, using the bearing grease oil film thickness measurement test device as described above, comprising the following steps: Step 1: Determine the specifications, movement form and speed of the ball and glass disc 301, select the first drive motor 1101, the second drive motor 1201 and the third drive motor 303, and determine the specifications and model of the tested grease, which specifically includes the following steps: Step 1.1: Determine the specifications, movement form and speed of the glass disc 301 and the ball, and select the first drive motor 1101, the second drive motor 1201 and the third drive motor 303; Step 1.2: Determine the specification and type of the grease applied under the glass disc 301; Step 1.3: Prepare the items required for the test, including the grease sample for the test glass disc 301, an electronic balance for weighing the grease, a torque wrench, a tool for sampling the test grease, a sample bag and a label for sealing the test grease sample, and petroleum ether for removing residual foreign matter on the glass disc 301; Step 1.4: Be familiar with the use of electronic balance and optical measurement system, check whether the circuit and gas connection of the whole test device are in good condition, and check whether the sealing of test box 1 is in good condition.

[0035] Step 2: Install the disc drive mechanism, calculate the amount of grease applied to the glass disc 301, and evenly spread the bearing grease on the entire lower surface of the glass disc 301, specifically including the following steps: Step 2.1: Calculate the amount of test grease to be added according to the surface area of ​​the glass disc 301 and the size of the ball so that the grease can be evenly applied to the entire lower surface of the glass disc 301; Step 2.2: According to the calculated amount of grease, use an electronic balance to weigh the grease required for the test. Weigh 3 portions and perform multiple tests to reduce errors and ensure the accuracy of the test. Step 2.3: Wipe the glass disc 301 to ensure that there is no foreign matter remaining on the glass disc 301; Step 2.4: Install the third drive motor 303 onto the disc support platform 1002, then install the disc support rod 302 onto the third drive motor 303 via a coupling, and then gently place the glass disc 301 at a fixed position on the disc support rod 302; Step 2.5: Align the bolt connection holes of the glass disc 301 and the disc support rod 302, use a torque wrench to fix the glass disc 301, and adjust the disc lifting platform so that the glass disc 301 is in a higher position; Step 2.6: Apply grease evenly on the lower surface of the glass disc 301.

[0036] Step 3: Install the ball drive mechanism, optical measurement system, support mechanism and longitudinal load loading mechanism, including the following steps: Step 3.1: Install the ball drive mechanism and check whether the screw drive mechanism installed on the support platform 2 can drive the moving platform 16 to move smoothly; Step 3.2: Install the longitudinal load loading mechanism and the support mechanism, adjust the support mechanism on the ball support base plate 1401 so that the distance between the fixed support roller 1304 and the movable support roller 1303 is maximized, adjust the position of the ball rotary drive mechanism, and thread the ball onto the ball rotary drive mechanism so that the ball is located between the fixed support roller 1304 and the movable support roller 1303; Step 3.3: Match the dynamometer 1403 with the force applying base 1404 on the ball bearing support base plate 1401, and adjust the magnitude of the force applied by the dynamometer 1403 so that the ball bearing support base plate 1401 is parallel to the support platform 2, and clear the count of the dynamometer 1403; Step 3.4: The ball is gently brought into contact with the fixed support roller 1304, and the support mechanism is adjusted so that the movable support roller 1303 is also brought into contact with the ball, thereby completing the ball limiting; Step 3.5: According to the requirements of the test rolling-slip ratio simulation and sliding speed, the distance between the ball and the center of the glass disc 301 is calculated, and the disc lifting platform and the moving platform 16 are adjusted so that the ball and the glass disc 301 are lightly in contact at the specified position; Step 3.6: Adjust the position of the microscope 802 so that the lens of the microscope 802 is aligned with the center of the ball; Step 3.7: According to the rolling-slip ratio simulation requirements of the test, the rotation speeds of the third drive motor 303 and the first drive motor 1101 are set, and the extrusion force that the longitudinal load loading mechanism needs to apply is set.

[0037] Step 4: Set the collection frequency and total test duration of lubricating film thickness, atmospheric pressure, salt spray concentration, oxygen concentration, temperature and humidity parameters, and record the test data of the test grease, including the following steps: Step 4.1: According to the actual working environment of the spindle bearing and the experimental requirements, set the simulation parameters such as atmospheric pressure, salt spray concentration, oxygen concentration, temperature and humidity in the test chamber 1; Step 4.2: Set the total duration of the test and the frequency of collecting lubricating film thickness and environmental parameters; Step 4.3: Start the test and record the test grease film thickness according to the test specification until the test time reaches the total test duration.

[0038] Step 5: After the test is finished, the environmental simulation system is turned off, the third drive motor 303 and the first drive motor 1101 are turned off, the glass disc 301 is disassembled, the test grease is collected and the glass disc 301 is cleaned, which specifically includes the following steps: Step 5.1: After the test is finished, the environmental simulation system is turned off through the external control cabinet, the microscope 802 is moved, the squeezing force applied by the longitudinal load loading mechanism is reduced, the disc lifting platform is raised, and the third drive motor 303 and the first drive motor 1101 are turned off; Step 5.2: Open the test box 1, remove the glass disc 301 with a torque wrench, collect the test grease and wipe the glass disc 301 with petroleum ether until it is completely clean, and leave it in a ventilated environment for 2 hours to wait for the petroleum ether to evaporate and be used for the next test; Step 5.3: After the test, the recorded grease film thickness is statistically analyzed and reliability evaluated to help scientifically select and properly use grease when using the bearing.

[0039] 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 bearing grease film thickness measurement test device, comprising a test box (1) and a support table (2), characterized in that: A disc drive mechanism for driving a glass disc (301) to perform reciprocating linear motion and rotational motion is provided in the test box (1); a ball drive mechanism for driving a ball to move is provided on the support table (2); the ball drive mechanism comprises a ball rotation drive mechanism and a ball movement drive mechanism; the ball movement drive mechanism is also provided with a longitudinal load loading mechanism and a support mechanism for placing the ball; an optical measurement system for measuring the thickness of a grease film is provided on the support table (2); the optical measurement system comprises a microscope support frame (6), a light source box (7) and an image acquisition system; the microscope support frame (6) is mounted on the support table (2); the light source box (7) and the image acquisition system are arranged on the microscope support frame (6); and an environmental simulation system is also provided on the test box (1).

2. A bearing grease film thickness measurement test device according to claim 1, characterized in that: The disc driving mechanism comprises a disc supporting rod (302), a third driving motor (303) and a disc lifting platform for lifting the glass disc (301); the third driving motor (303) is arranged on the disc lifting platform; one end of the disc supporting rod (302) is connected to the glass disc (301) via a bolt; and the other end of the disc supporting rod (302) is connected to the output end of the third driving motor (303) via a coupling.

3. A bearing grease film thickness measurement test device according to claim 2, characterized in that: The disc lifting platform comprises a lifting base (1001), a disc supporting platform (1002), a lifting curved rod (1003), a curved rod fixing block (1004) and a height adjustment bolt (1005). The lifting base (1001) is fixedly connected to the supporting platform (2) by bolts. The lifting base (1001) is symmetrically rotatably connected to two groups of lifting curved rods (1003). Each group comprises two lifting curved rods (1003). The two lifting curved rods (1003) in each group are rotatably connected to a curved rod fixing block (1004). The height adjustment bolt (1005) is provided to the lifting base (1001) and the lifting base (1001) is provided to the lifting base (1001). The threads at both ends of the joint bolt (1005) are rotated in opposite directions, and the two bent rod fixing blocks (1004) are respectively threadedly connected to the two ends of the height adjustment bolt (1005). The disc support platform (1002) is also symmetrically rotatably connected with two sets of lifting bent rods (1003). The lifting bent rod (1003) connected to the disc support platform (1002) is rotatably connected to the adjacent bent rod fixing block (1004) at one end away from the disc support platform (1002). The third drive motor (303) is fixedly connected to the disc support platform (1002) by bolts.

4. A bearing grease film thickness measurement test device according to claim 2, characterized in that: The ball moving drive mechanism comprises a moving platform (16), a screw transmission mechanism, a second driving motor (1201) and a second motor seat (1202); the screw transmission mechanism is used to drive the moving platform (16) to perform linear motion; the screw transmission mechanism comprises a first coupling (1501), a second coupling (1502), a driving screw (1503), a screw support unit (1504), a guide rail (1505) and a slider (1506); the top of the support platform (2) is fixedly connected to two symmetrically arranged guide rails (1505); each guide rail (1505) is slidably provided with a slider (1506); the two sliders (1506) are fixedly connected to each other. A mobile platform (16) is connected, the second motor seat (1202) is fixedly connected to the support platform (2) by bolts, the second drive motor (1201) is fixedly connected to the second motor seat (1202) by bolts, the screw support unit (1504) is fixedly connected to the top of the support platform (2) by bolts, the screw support unit (1504) is arranged corresponding to the position of the second motor seat (1202), one end of the drive screw (1503) is connected to the output end of the second drive motor (1201) through the first coupling (1501), and the other end of the drive screw (1503) is connected to the screw support unit (1504) through the second coupling (1502).

5. A bearing grease film thickness measurement test device according to claim 4, characterized in that: The ball rotary drive mechanism comprises a first drive motor (1101), a first motor seat (1102) and a ball drive connecting rod (1103); the first motor seat (1102) is fixedly connected to the mobile platform (16) by means of bolts; the first drive motor (1101) is fixedly connected to the first motor seat (1102) by means of bolts; one end of the ball drive connecting rod (1103) is connected to the output end of the first drive motor (1101) by means of a coupling; and the other end of the ball drive connecting rod (1103) is fixedly connected to the ball by means of a threaded connection.

6. A bearing grease film thickness measurement test device according to claim 5, characterized in that: The longitudinal load loading mechanism comprises a ball bearing support base plate (1401), a base plate side support seat (1402), a dynamometer (1403) and a force applying base (1404); the base plate side support seat (1402) is fixedly connected to one side of the mobile platform (16) by means of bolts; the side of the mobile platform (16) away from the base plate side support seat (1402) is fixedly connected to the dynamometer (1403) by means of bolts; the dynamometer (1403) is arranged corresponding to the position of the base plate side support seat (1402); the ball bearing support base plate (1401) is rotatably connected to the base plate side support seat (1402); and the side of the ball bearing support base plate (1401) away from the base plate side support seat (1402) is fixedly connected to the force applying base (1404) by means of bolts.

7. A bearing grease film thickness measurement test device according to claim 6, characterized in that: A support mechanism for placing balls is also provided on the ball support base plate (1401), the support mechanism comprising a cam (1301), a ball radius adjustment plate (1302), a movable support roller (1303), a fixed support roller (1304) and a support roller mounting platform (1305). The support roller mounting platform (1305) is fixedly connected to the ball support base plate (1401) by bolts, and two fixed bearings are rotatably connected to the support roller mounting platform (1305). A fixed support roller (1304) is provided with a rotating shaft fixedly disposed on the ball support base plate (1401); the cam (1301) is rotatably connected to the rotating shaft on the ball support base plate (1401); a nut is threadedly connected to the rotating shaft; a ball radius adjustment plate (1302) is slidably connected to a limit guide rail on the ball support base plate (1401); and the side of the ball radius adjustment plate (1302) away from the cam (1301) is rotatably connected to two movable support rollers (1303).

8. The bearing grease film thickness measuring test device according to claim 7, characterized in that: The image acquisition system comprises a CCD camera (801), a microscope (802), a microscope adjustment mechanism (17) and a microscope longitudinal adjustment bracket (803); the microscope longitudinal adjustment bracket (803) is connected to a microscope support frame (6); the microscope adjustment mechanism (17) is mounted on the microscope longitudinal adjustment bracket (803); the microscope (802) is mounted on the microscope adjustment mechanism (17); the light source box (7) is connected to the microscope (802) via an optical fiber tube; and the CCD camera (801) is connected to the eyepiece of the microscope (802).

9. A bearing grease film thickness measurement test device according to claim 8, characterized in that: The environmental simulation system comprises a temperature regulating member (901), an air pressure sensor (902), a humidity regulating member (903), an oxygen concentration sensor (904), a salt spray concentration sensor (905), a first spray system (906) and a second spray system (907) arranged in a test box (1); a salt spray generator (908) connected to the first spray system (906), a nitrogen generator (910) and an oxygen generator (911) connected to the second spray system (907) and a water pump (909) connected to the humidity regulating member (903) are arranged outside the test box (1).

10. A test method for measuring the thickness of a grease film for a bearing, characterized in that: Using the bearing grease film thickness measurement test device as claimed in claim 9, the method comprises the following steps: Step 1: Determine the specifications, movement form and speed of the ball and glass disc (301), select the first drive motor (1101), the second drive motor (1201) and the third drive motor (303), and determine the specifications and model of the tested grease; Step 2: Install the disc drive mechanism, calculate the amount of grease to be applied to the glass disc (301), and evenly spread the bearing grease over the entire lower surface of the glass disc (301); Step 3: Install the ball drive mechanism, optical measurement system, support mechanism and longitudinal load loading mechanism; Step 4: Set the collection frequency and total test duration of lubricating film thickness, atmospheric pressure, salt spray concentration, oxygen concentration, temperature and humidity parameters, and record the test data of the test grease; Step 5: After the test is completed, the environmental simulation system is turned off, the third drive motor (303) and the first drive motor (1101) are turned off, the glass disc (301) is disassembled, the test grease is collected and the glass disc (301) is cleaned.

Images