A ball screw grease dynamic performance monitoring test device and method

Abstract

A test device and method for monitoring the dynamic performance of grease for a ball screw pair, comprising a test box and a bed arranged in the test box for installing a test screw, the bed being provided with a speed loading mechanism and an axial force loading mechanism for testing the test screw, and the bed being provided with a load mechanism for cooperating with the axial force loading mechanism; the test screw being provided with a test fixture for monitoring the dynamic performance of the grease; compared with the existing technology, the device realizes real-time monitoring of the film thickness of the test grease, thereby analyzing the grease degradation process and effectively identifying the grease usage status, based on which timely grease replacement and scientific grease selection are carried out to avoid over-lubrication or poor lubrication, thereby effectively improving the reliability and maintenance cost of the ball screw pair.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical device testing, and in particular to a dynamic performance monitoring test device and method for lubricating grease for a ball screw pair. Background Art

[0002] As the manufacturing industry evolves toward higher precision, higher efficiency, and higher reliability, demand for high-end CNC equipment is increasing significantly. Ball screws, due to their high transmission efficiency, low environmental requirements, high reliability, and long life, are widely used as key transmission components in high-end CNC equipment. The performance of ball screws significantly impacts the overall performance of high-end CNC equipment.

[0003] Ball screws are often lubricated with grease. Tests and research have shown that grease significantly impacts the performance of ball screws, with the lifespan of the grease determining its service life to a certain extent. Proper grease use can reduce the friction coefficient of the ball screw and slow down the temperature rise, thereby improving its motion efficiency and service life. Grease's dynamic characteristics continually change during use. As its service life increases, its performance gradually degrades, and it loses its lubricating properties, affecting the ball screw. Real-time monitoring of the grease's dynamic properties and analysis of its degradation process can effectively identify its usage status. This allows for timely grease changes and scientific grease selection to avoid over-lubrication or under-lubrication, effectively improving the reliability and maintenance costs of ball screws.

[0004] Chinese patent application number 201410016756.5 discloses a ball screw reliability test device. In this test device, the screw under test is supported at both ends by a screw support unit. A loading mechanism is connected to the two nuts of the screw under test via a fixture, thereby applying an internal tensile / compressive load between the two sets of nuts on each screw under test. A tensile / compressive load sensor is used to measure the loading force in real time. A variable frequency motor drives the screw under test in forward and reverse rotation, driving the loading mechanism to reciprocate on the bed, thereby completing the reliability test and measurement of the entire length of the screw thread. During the test, the operating status of the screw under test is monitored in real time using a dynamic torque sensor, a noise sensor, and a vibration sensor to determine whether to continue the test. Chinese patent application number 201510780224.3 discloses an axial loading device for a ball screw pair. The above-mentioned axial loading device includes an axial loading test bench and a ball screw pair test bench. The ball screw pair test bench includes a test bench body, a ball screw pair located on the test bench body, and a simulation workbench driven by the ball screw pair. The axial loading test bench is connected to the simulation workbench. The axial loading test bench includes a loading table body, a winding body arranged on the loading table body, and a loading rope wound on the winding body. The other end of the loading rope is connected to the simulation workbench. A loading force adjustment device is also provided on the loading table body, which acts on the winding body to control the loading force of the loading rope on the simulation workbench.

[0005] In the above-mentioned disclosed prior art, an internal tensile / compressive load is applied to the screw pair under test through a loading mechanism, and the loading force is measured in real time through a tensile / compressive sensor. At the same time, the screw pair under test is driven to rotate by a motor, thereby completing the reliability test and test of the entire length of the screw pair thread. The existing technology all tests the performance of the screw pair itself, and cannot monitor the dynamic performance of the grease used for the ball screw pair, and thus cannot understand the grease degradation process and cannot effectively identify the grease usage status. Summary of the Invention

[0006] The present invention aims to overcome the above-mentioned defects in the prior art and to provide a ball screw pair grease dynamic performance monitoring test device and method capable of monitoring the dynamic performance of the ball screw pair grease.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions: a dynamic performance monitoring test device for grease for a ball screw pair, comprising a test box and a bed arranged in the test box for installing a test screw, the bed being provided with a speed loading mechanism and an axial force loading mechanism for testing the test screw, and the bed being provided with a load mechanism for cooperating with the axial force loading mechanism; the test screw being provided with a test fixture for monitoring the dynamic performance of the grease, the test fixture comprising a fixture body and a groove formed in the fixture body for placing balls and applying grease, a preload adjustment part and a capacitive grease film thickness monitoring part being provided at both ends of the fixture body, and a temperature sensor being provided at one end of the fixture body; the test box is also provided with an environmental simulation mechanism.

[0008] As a preferred solution of the present invention, the speed loading mechanism includes a loading motor and a test workbench connected to a test screw, the test screw is connected to the output end of the loading motor, a first connecting piece for connecting the test screw is provided at the bottom of the test workbench, and the test tooling is connected to the first connecting piece.

[0009] As a preferred solution of the present invention, the load mechanism includes a load motor and a driving screw connected to the output end of the load motor, and the driving screw is connected to a load workbench that moves synchronously with the test workbench.

[0010] As a preferred solution of the present invention, guide rails for guiding the movement of the test workbench and the load workbench are provided on both sides of the bed.

[0011] As a preferred solution of the present invention, the bed is provided with a grating scale for monitoring the position of the test workbench. The grating scale includes a grating scale support seat and grating encoding scales arranged on both sides of the grating scale support seat. A wiring board is provided in the grating scale support seat.

[0012] As a preferred solution of the present invention, a photosensitive head for monitoring the position of the test workbench is movably provided on the grating encoding scale, and a photosensitive head connector for connecting to the test workbench is provided on the grating encoding scale, and the photosensitive head is connected to the photosensitive head connector.

[0013] As a preferred solution of the present invention, the axial force loading mechanism includes a force sensor and a loading cylinder, both ends of the force sensor are respectively connected to the output end of the loading cylinder and the load workbench, and the loading cylinder is arranged on the test workbench.

[0014] As a preferred solution of the present invention, the tool body is provided with a through hole connected to the test screw, a groove is formed on the hole wall of the through hole, the temperature sensor and the capacitive grease film thickness monitoring component are located at the same end of the tool body, and the capacitive grease film thickness monitoring component is arranged in the groove.

[0015] As a preferred solution of the present invention, a shaft sleeve for mounting a temperature sensor is provided in the through hole, and a sealing ring for sealing is provided on the inner wall of the shaft sleeve.

[0016] As a preferred solution of the present invention, the preload adjustment member includes a fixed ring arranged at the end of the through hole and a plurality of fasteners for adjusting the deformation of the tooling body, the plurality of fasteners are arranged on the outer wall of the tooling body, and the plurality of fasteners are arranged along the circumferential direction of the tooling body.

[0017] As a preferred solution of the present invention, the environmental simulation mechanism includes a dust box arranged on the test box and a temperature adjustment component and a humidity adjustment component arranged inside the test box. A nozzle connected to the dust box is provided on the top of the test box, and an air pump, a nitrogen generator, and an oxygen generator connected to the internal box of the test box are provided on the outside of the test box.

[0018] A test method for monitoring the dynamic performance of grease for a ball screw pair comprises the following steps:

[0019] Step 1: Determine the specifications and model of the test screw, select the test fixture, and determine the specifications and model of the grease used for the test screw;

[0020] Step 2: Calculate the amount of grease to be added to the test screw and fill the test screw with grease to 2 / 3 of the internal space of the test fixture;

[0021] Step 3: Install the speed loading mechanism and axial force loading mechanism;

[0022] Step 4: Set the collection frequency and total test duration of the lubricating film thickness, temperature, and humidity parameters, and record the test data of the test grease;

[0023] Step 5: After the test ends, turn off the environmental simulation mechanism, the speed loading mechanism, and the axial force loading mechanism, recycle and clean the dust used for working environment simulation, disassemble the test fixture, collect the test grease, and clean the test fixture.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The test screw is driven to rotate by the speed loading mechanism, and an axial force is applied to the test screw by the axial loading mechanism. A test fixture for monitoring the dynamic performance of the grease is provided on the test screw. By placing the ball in the groove of the test fixture and applying grease in the groove, the grease film thickness parameters are obtained by the capacitive grease film thickness monitoring element, thereby achieving real-time monitoring of the test grease film thickness. The grease degradation process can be analyzed and the grease usage status can be effectively identified. Based on this, timely grease change and scientific grease selection can be carried out to avoid over-lubrication or poor lubrication, which can effectively improve the reliability and maintenance cost of the ball screw pair.

[0026] 2. Furthermore, by adjusting the environment in the test chamber through the environmental simulation mechanism, the load characteristics of the grease used in the ball screw pair under actual working conditions are restored, and the accuracy of the monitoring results is increased, thereby improving the effectiveness of the device in monitoring the dynamic performance of the grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the speed loading mechanism of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the load mechanism of the present invention;

[0030] Figure 4 It is a structural diagram of the grating ruler;

[0031] Figure 5 It is a structural diagram of the axial force loading mechanism;

[0032] Figure 6 It is a structural diagram of the test tooling;

[0033] Figure 7 1. It is a structural diagram of a preload adjustment member;

[0034] Figure 8 This is a schematic diagram of the structure of the environmental simulation mechanism.

[0035] Figure 1: Test box 1, bed 101, guide rail 1011, test screw 2, speed loading mechanism 3, loading motor 301, first coupling 3011, first support seat 3012, test workbench 302, first connecting member 3021, axial force loading mechanism 4, force sensor 401, second coupling 4011, loading cylinder 402, cylinder seat 4021, connecting seat 403, test fixture 5, fixture body 501, through hole 5011, groove 5012, capacitive grease film thickness monitoring component 502, sleeve 503, sealing ring 5031, preload adjustment component 504, fastener 5 041, fixed ring 5042, temperature sensor 505, load mechanism 6, load motor 601, drive screw 6011, third coupling 6012, second support seat 6013, load workbench 602, second connecting piece 6021, environmental simulation mechanism 7, dust box 701, nozzle 7011, temperature adjustment part 702, humidity adjustment part 703, air pump 704, nitrogen generator 705, oxygen generator 706, grating scale 8, grating scale support seat 801, wiring board 802, grating encoder scale 803, guide groove 8031, optical head connecting piece 804, optical head 805, control cabinet 9. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] like Figures 1-8 As shown, a dynamic performance monitoring test device for grease for a ball screw pair includes a test box 1 and a bed 101 arranged in the test box 1 for installing a test screw 2, the bed 101 is provided with a speed loading mechanism 3 and an axial force loading mechanism 4 for testing the test screw 2, and the bed 101 is provided with a load mechanism 6 for cooperating with the axial force loading mechanism 4; the test screw 2 is provided with a test fixture 5 for monitoring the dynamic performance of the grease, the test fixture 5 includes a fixture body 501 and a groove 5012 formed in the fixture body 501 for placing balls and applying grease, a preload adjustment part 504 and a capacitive grease film thickness monitoring part 502 are respectively provided at both ends of the fixture body 501, and a temperature sensor 505 is provided at one end of the fixture body 501; the test box 1 is also provided with an environmental simulation mechanism 7.

[0038] Furthermore, the present invention can simultaneously test two test screws 2, that is, two sets of load mechanisms 6 and axial force loading mechanisms 4 are provided on the bed 101, and each set of load mechanisms 6 and axial force loading mechanisms 4 are respectively connected to a test screw 2, and the speed loading mechanism 3 can simultaneously cooperate with the two sets of axial force loading mechanisms 4 to apply axial force to the two test screws 2.

[0039] The test box 1 is a closed structure, which makes it easy for the environmental simulation mechanism 7 to adjust and change the environment in the test box 1, so as to make it closer to the working conditions of the test screw 2. The front of the test box 1 is detachable and is provided with an observation window; the speed loading mechanism 3 and the load mechanism 6 have the same operating speed, and the axial force loading mechanism 4 is provided on the speed loading mechanism 3 and the load mechanism 6; the ball is placed in the groove 5012 of the test fixture 5, and grease is applied in the groove 5012. The grease film thickness parameters are obtained under the action of the capacitive grease film thickness monitoring component 502, thereby realizing real-time monitoring of the test grease film thickness, and then the grease degradation process can be analyzed, and the grease usage status can be effectively identified, based on which timely grease change and scientific grease selection can be carried out to avoid over-lubrication or poor lubrication, which can effectively improve the reliability and maintenance cost of the ball screw pair.

[0040] The speed loading mechanism 3 includes a loading motor 301 and a test workbench 302 connected to the test screw 2. The test screw 2 is connected to the output end of the loading motor 301. A first connecting piece 3021 for connecting the test screw 2 is provided at the bottom of the test workbench 302, and the test tool 5 is connected to the first connecting piece 3021. Furthermore, the speed loading mechanism 3 is fixedly connected to the bed 101 by bolts. The end of the test screw 2 is provided with a first support seat 3012 for supporting the test screw 2, and the two ends of the test screw 2 are respectively connected to the first coupling 3011. The two first couplings 3011 are respectively connected to the loading motor 301 and the first support seat 30127. The loading motor 301 drives the test workbench 302 to move. The first connecting piece 3021 is threadedly connected to the test screw 2. The test tool 5 is connected to the first connecting piece 3021, and the test tool 5 is sleeved on the test screw 2.

[0041] The load mechanism 6 includes a load motor 601 and a driving screw 6011 connected to the output end of the load motor 601. The driving screw 6011 is connected to a load workbench 602 that moves synchronously with the test workbench 302. Furthermore, the load mechanism 6 is used to simulate the loading of the rotational speed of the test screw 2. Specifically, the end of the driving screw 6011 is provided with a second support seat 6013 for supporting the driving screw 6011, and third couplings 6012 are respectively provided at both ends of the driving screw 6011. The two third couplings 6012 are respectively connected to the output end of the load motor 601 and the second support seat 6013. A second connecting member 6021 rotatably connected to the driving screw 6011 is provided at the bottom of the load workbench 602. The load motor 601 drives the load workbench 602 to move. The load workbench 602 and the test workbench 302 have the same moving speed, and the load workbench 602 and the test workbench 302 move synchronously.

[0042] Guide rails 1011 are provided on both sides of the bed 101 for guiding the movement of the test workbench 302 and the load workbench 602. Furthermore, two groups of guide rails 1011 are provided for guiding the two groups of test workbenches 302 and the load workbench 602. Specifically, the two groups of guide rails 1011 are respectively provided on the opposite sides of the bed 101, and the guide rails 1011 are provided along the length direction of the bed 101.

[0043] A grating scale 8 for monitoring the position of the test workbench 302 is provided on the bed 101. The grating scale 8 includes a grating scale support seat 801 and a grating encoding scale 803 arranged on both sides of the grating scale support seat 801. A wiring board 802 is provided in the grating scale support seat 801. Furthermore, a photosensitive head 805 for monitoring the position of the test workbench 302 is movably provided on the grating encoding scale 803, and a photosensitive head connector 804 for connecting to the test workbench 302 is provided on the grating encoding scale 803. The photosensitive head 805 is connected to the photosensitive head connector 804.

[0044] Specifically, the wiring board 802 is installed on the grating scale support seat 801 by screws, the grating encoder scale 803 is installed on both sides of the grating scale support seat 801 by screws, the upper surface of the optical head connector 804 is installed on the test workbench 302 by screws, and the optical head 805 is installed on the lower surface of the optical head connector 804 by screws and installed on the guide groove 8031 ​​of the grating encoder scale 803 to realize real-time monitoring of the position of the workbench sub-component 241. The guide groove 8031 ​​is set along the length direction of the grating encoder scale 803.

[0045] The axial force loading mechanism 4 includes a force sensor 401 and a loading cylinder 402. Both ends of the force sensor 401 are respectively connected to the output end of the loading cylinder 402 and the load workbench 602. The loading cylinder 402 is arranged on the test workbench 302. Furthermore, the axial force loading mechanism 4 is used to simulate the loading of the axial force. Specifically, a second coupling 4011 is provided at both ends of the force sensor 401. The force sensor 401 is connected to the output end of the loading cylinder 402 through the second coupling 4011. The second coupling 4011 at the other end of the force sensor 401 is connected to a connecting seat 403. The connecting seat 403 is fixed to the load workbench 602 by screws, and the cylinder seat 4021 is fixed to the test workbench 302 by screws. Because the load workbench 602 and the test workbench 302 move at the same speed, the force applied by the loading cylinder 402 is the axial force exerted on the test screw 2, thereby realizing the simulated loading of the axial force.

[0046] A through hole 5011 connected to the test screw 2 is provided on the tool body 501, and a groove 5012 is formed on the hole wall of the through hole 5011. The temperature sensor 505 and the capacitive grease film thickness monitoring component 502 are located at the same end of the tool body 501, and the capacitive grease film thickness monitoring component 502 is arranged at the groove 5012. A shaft sleeve 503 for installing the temperature sensor 505 is provided in the through hole 5011, and a sealing ring 5031 for sealing is provided on the inner wall of the shaft sleeve 503. Furthermore, the test tool 5 can realize real-time monitoring of the dynamic performance parameters of the test grease and simulated loading of the preload force of the test screw 2. Specifically, the tool body 501 is made of elastic insulating material. A groove 5012 for storing balls is provided on the inner side of the main body 501, and the test grease is smeared on the groove 5012. The temperature sensor 505 is installed on the sleeve 503 to realize real-time monitoring of the test grease temperature; the sleeve 503 is fixed to the tool body 501 by screws, and the sealing ring 5031 is installed on the inner side of the sleeve 503, and the sealing ring 5031 is in contact with the test screw 2. The capacitive grease film thickness monitoring component 502 has two induction coils. The tool body 501 and the test screw 2 are selected as the monitoring parts, and the two induction coils are respectively installed between the sleeve 503 and the tool body 501 and on the test screw 2. The film thickness value of the test grease is calculated using the difference in capacitance between the monitoring parts.

[0047] The preload adjustment member 504 includes a fixed ring 5042 arranged at the end of the through hole 5011 and a number of fasteners 5041 for adjusting the deformation of the tooling body 501. The number of fasteners 5041 are arranged on the outer wall of the tooling body 501, and the number of fasteners 5041 are arranged along the circumferential direction of the tooling body 501. Furthermore, the adjustment of the preload is achieved by utilizing the characteristic that the elastic material of the tooling body 501 can be slightly deformed. The fixed ring 5042 is a rigid material. When the tightening torque of the fastener 5041 is adjusted, the tooling body 501 is slightly deformed, the fixed ring 5042 does not deform, the space of the groove 501 becomes smaller, and the preload of the test screw 2 is increased, thereby realizing simulated loading of the preload.

[0048] The environmental simulation mechanism 7 includes a dust box 701 arranged on the test box 1 and a temperature adjustment component 702 and a humidity adjustment component 703 arranged in the test box 1. A nozzle 7011 connected to the dust box 701 is provided on the top of the test box 1. An air pump 704 connected to the internal box of the test box 1, a nitrogen generator 705, and an oxygen generator 706 are provided on the outside of the test box 1.

[0049] Specifically, a temperature regulator 702 is mounted on the left inner surface of test chamber 1, and a humidity regulator 703 is mounted on the right inner surface of test chamber 1, regulating the temperature and humidity within test chamber 1. A nitrogen generator 705, an oxygen generator 706, and an air pump 704 are placed outside test chamber 1. A dust box 701 is mounted on the top outer surface of test chamber 1. Six nozzles 7011 are mounted in two rows symmetrically along the left and right central axis of test chamber 1. An air pump 805 provides dry air to test chamber 1, blowing dust from dust box 701 into test chamber 1 to simulate the working environment of test screw 2. A control cabinet 9 is also located outside test chamber 1 to control test parameters.

[0050] A test method for monitoring the dynamic performance of grease for a ball screw pair comprises the following steps:

[0051] Step 1: Determine the specifications and model of the test screw 2, select the test fixture 5, and determine the specifications and model of the grease used for the test screw 2;

[0052] The specific steps include:

[0053] 1.1: Determine the specifications and models of the two test screws 2, and select the test fixture 5 and the first connecting piece 3021;

[0054] 1.2: Determine the specifications and type of grease for the test screw 2 to be tested;

[0055] 1.2: Prepare the items required for the test, including the grease sample for the test screw 2, an electronic balance for weighing the grease, a torque wrench, a tool for sampling the test grease, a sample bag and label for sealing the test grease sample, and petroleum ether for removing residual grease on the test fixture 5;

[0056] 1.3: Be familiar with the use of electronic balance and capacitive grease film thickness monitoring device, check whether the circuit and gas line connections are good, and check whether the control cabinet 9 can be used normally.

[0057] Step 2: Calculate the amount of grease to be added to the test screw 2, and fill the test screw 2 with grease to fill 2 / 3 of the internal space of the test fixture 5;

[0058] Applying the test grease sample and assembling the test fixture 5 and the first connecting member 3021 specifically include the following steps:

[0059] 2.1: Calculate the amount of test grease to be added based on the volume of the grooves 5012 of the two sets of test fixtures 5. The amount of grease to be added is 2 / 3 of the volume of the grooves 5012.

[0060] 2.2: Based on the calculated grease addition amount, use an electronic balance to weigh the grease required for the two groups of test screws 2, 4 parts for each group;

[0061] 2.3: Confirm that there is no residual foreign matter on the groove 5012. If there is, the tool body 501 needs to be cleaned;

[0062] 2.4: Assemble the preload adjustment member 504 onto the tool body 501, and only gently screw the fastener 5041 into the opening of the fixing ring 5042;

[0063] 2.5: Evenly add test grease to the groove 5012, then evenly add balls to the groove 5012. Assemble the tool body 501 to the test screw 2 from one end of the test screw 2, install the capacitive grease film thickness monitoring element 502, and install the temperature sensor 505, sleeve 503 and seal ring 5031;

[0064] 2.6: Use a torque wrench to adjust the tightening torque of the fastener 5041 to the required value, install the test fixture 5 on the first connecting piece 3021, and tighten the fixing screws;

[0065] 2.7: Repeat steps 2.3 to 2.6 until all test fixtures 5 are assembled with the first connecting piece 3021.

[0066] Step 3: Install the speed loading mechanism 3 and the axial force loading mechanism 4;

[0067] The specific steps include:

[0068] 3.1: Install the assembled test screw 2 to the output end of the loading motor 301, connect the drive screw 6011 to the output end of the load motor 601, and install the test workbench 302 to the first connecting member 3021 and the load workbench 602 to the second connecting member 6021 using screws;

[0069] 3.2: Connect each test bench 302 to the guide rail 1011 with screws, and connect the optical head connector 604 to the test bench 302;

[0070] 3.3: Connect the various test benches 302 together, and install the axial force loading mechanism 4 on the load bench 602 and the test bench 302 respectively by screws;

[0071] 3.4: Manually push the test workbench 302 to ensure that all components are firmly installed and that the test grease is evenly filled in each tooling body 501;

[0072] 3.5: Set the test parameters of the speed loading mechanism 3, axial force loading mechanism 4, and environmental simulation mechanism 7 through the control cabinet 9

[0073] Step 4: Set the collection frequency and total test duration of the lubricating film thickness, temperature, and humidity parameters, and record the test data of the test grease;

[0074] The specific steps include:

[0075] 4.1: Based on the normal working stress of the selected test screw 2, calculate the speed and axial force of the dynamic performance monitoring test of the ball screw pair grease to simulate the actual working conditions;

[0076] 4.2: Use the control cabinet to set the grease test environment temperature, humidity, and working environment simulation parameters, the test parameters of the speed loading mechanism 3 and the axial force loading mechanism 4, the total test duration, and the frequency of collecting lubricating film thickness and temperature;

[0077] 4.3: Start the test and record the dynamic performance of the test grease according to the test specifications until the test time reaches the total test time;

[0078] Step 5: After the test ends, turn off the environmental simulation mechanism 7, the speed loading mechanism 3, and the axial force loading mechanism 4, recycle and clean the dust used for working environment simulation, disassemble the test fixture 5, collect the test grease, and clean the test fixture 5.

[0079] The specific steps include:

[0080] 5.1: After the test ends, the speed loading mechanism 3, the axial force loading mechanism 4, and the environment simulation mechanism 7 are turned off through the control cabinet 9, and a small vacuum cleaner is turned on to collect the dust used for the working environment simulation;

[0081] 5.2: Open the door of the test chamber 1, disassemble the test screw 2 and the test fixture 5, collect the test grease and clean the test fixture 5 and the test screw 2 completely with petroleum ether. Leave them in a ventilated environment for 2 hours until the petroleum ether evaporates and they are ready for the next test.

[0082] 5.3: After the test, the dynamic performance degradation data of the test grease is statistically analyzed to obtain the dynamic performance degradation law of the test grease

[0083] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be embodied in the widest possible manner consistent with the principles and novel features disclosed herein.

[0084] Although this article uses more reference numerals in the figure: test box 1, bed 101, guide rail 1011, test screw 2, speed loading mechanism 3, loading motor 301, first coupling 3011, first support seat 3012, test workbench 302, first connecting member 3021, axial force loading mechanism 4, force sensor 401, second coupling 4011, loading cylinder 402, cylinder seat 4021, connecting seat 403, test fixture 5, fixture body 501, through hole 5011, groove 5012, capacitive grease film thickness monitoring component 502, sleeve 503, sealing ring 5031, preload adjustment component 504, fastener 5041, The following terms are used, but the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. A ball screw pair grease dynamic performance monitoring test device, comprising a test box (1) and a bed (101) arranged in the test box (1) for installing a test screw (2), characterized in that: The bed (101) is provided with a rotation speed loading mechanism (3) and an axial force loading mechanism (4) for testing the test screw (2), and the bed (101) is provided with a load mechanism (6) for cooperating with the axial force loading mechanism (4); the test screw (2) is provided with a test fixture (5) for monitoring the dynamic performance of the grease, the test fixture (5) comprising a fixture body (501) and a groove (5012) formed in the fixture body (501) for placing a ball and applying grease, a preload adjustment member (504) and a capacitive grease film thickness monitoring member (502) are respectively provided at both ends of the fixture body (501), and a temperature sensor (505) is provided at one end of the fixture body (501); the test box (1) is also provided with an environmental simulation mechanism (7); The speed loading mechanism (3) comprises a loading motor (301) and a test workbench (302) connected to a test screw (2); the test screw (2) is connected to the output end of the loading motor (301); a first connecting piece (3021) for connecting to the test screw (2) is provided at the bottom of the test workbench (302); and the test fixture (5) is connected to the first connecting piece (3021); The load mechanism (6) comprises a load motor (601) and a driving screw (6011) connected to an output end of the load motor (601), wherein the driving screw (6011) is connected to a load workbench (602) that moves synchronously with the test workbench (302); The axial force loading mechanism (4) comprises a force sensor (401) and a loading cylinder (402), wherein two ends of the force sensor (401) are respectively connected to the output end of the loading cylinder (402) and the load workbench (602), and the loading cylinder (402) is arranged on the test workbench (302); The tool body (501) is provided with a through hole (5011) connected to the test screw (2), a groove (5012) is formed on the hole wall of the through hole (5011), the temperature sensor (505) and the capacitive grease film thickness monitoring component (502) are located at the same end of the tool body (501), and the capacitive grease film thickness monitoring component (502) is arranged at the groove (5012); A shaft sleeve (503) for mounting a temperature sensor (505) is provided in the through hole (5011), and a sealing ring (5031) for sealing is provided on the inner wall of the shaft sleeve (503); The preload adjustment member (504) comprises a fixing ring (5042) arranged at the end of the through hole (5011) and a plurality of fasteners (5041) for adjusting the deformation of the tool body (501); the plurality of fasteners (5041) are arranged on the outer wall of the tool body (501), and the plurality of fasteners (5041) are arranged along the circumferential direction of the tool body (501).

2. A ball screw grease dynamic performance monitoring test device according to claim 1, characterized in that: Guide rails (1011) for guiding the movement of the test workbench (302) and the load workbench (602) are provided on both sides of the bed (101).

3. A ball screw grease dynamic performance monitoring test device according to claim 1, characterized in that: The bed (101) is provided with a grating ruler (8) for monitoring the position of the test workbench (302), the grating ruler (8) comprising a grating ruler support seat (801) and grating code rulers (803) arranged on both sides of the grating ruler support seat (801), and a wiring board (802) is provided in the grating ruler support seat (801); A photosensitive head (805) for monitoring the position of the test workbench (302) is movably provided on the grating code ruler (803), and a photosensitive head connecting piece (804) for connecting to the test workbench (302) is provided on the grating code ruler (803), and the photosensitive head (805) is connected to the photosensitive head connecting piece (804).

4. A ball screw grease dynamic performance monitoring test device according to claim 1, characterized in that: The environmental simulation mechanism (7) comprises a dust box (701) arranged on the test box (1) and a temperature regulating member (702) and a humidity regulating member (703) arranged inside the test box (1); a nozzle (7011) connected to the dust box (701) is provided on the top of the test box (1); an air pump (704) connected to the inner box of the test box (1), a nitrogen generator (705), and an oxygen generator (706) are provided on the outside of the test box (1).

5. A dynamic performance monitoring test method for ball screw grease, characterized in that: The ball screw pair grease dynamic performance monitoring test device according to any one of claims 1 to 4 comprises the following steps: Step 1: Determine the specifications and model of the test screw (2), select the test fixture (5), and determine the specifications and model of the grease used for the test screw (2); Step 2: Calculate the amount of grease to be added to the test screw (2), and fill the test screw (2) with grease to fill 2 / 3 of the internal space of the test fixture (5); Step 3: Install the speed loading mechanism (3) and the axial force loading mechanism (4); Step 4: Set the collection frequency and total test duration of the lubricating film thickness, temperature, and humidity parameters, and record the test data of the test grease; Step 5: After the test ends, turn off the environmental simulation mechanism (7), turn off the speed loading mechanism (3) and the axial force loading mechanism (4), recycle and clean the dust used for the working environment simulation, disassemble the test fixture (5), collect the test grease and clean the test fixture (5).

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