A combined gear acceleration life test bench and its test method based on meta-action theory

Abstract

The present invention discloses a combined gear acceleration life test bench based on the meta-action theory and a test method thereof, comprising a test bench, the test bench is provided with a vertically arranged rack and a magnetic scale, a first encoder is installed at the end of the cylindrical gear shaft away from the magnetic powder clutch, a second encoder is installed at the end of the first bevel gear shaft away from the first bevel gear, and a third encoder is installed at the end of the second bevel gear shaft away from the combined gear, and also comprises a microprocessor, a first vibration sensor is installed on the first bracket, a second vibration sensor is installed on the second bracket, and a third vibration sensor is installed on the rack support bracket, and the magnetic scale, the first encoder, the second encoder, the third encoder, the first vibration sensor, the second vibration sensor and the third vibration sensor are electrically connected to the microprocessor respectively. It can reflect the life evaluation of the combined gear under stress cycle.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission, and in particular to a combined gear acceleration life test bench based on element action theory and a test method thereof. Background Art

[0002] Gleason gears with arc teeth and spur teeth are widely used in mechanical transmission systems. They can transmit power between mutually perpendicular axes in a small space. It is a device that changes the rotational motion of a power source along one axis into rotational motion along another perpendicular axis through an arc tooth pair. It is widely used in nuclear power equipment, automobile differentials, machine tools and other equipment.

[0003] At present, regarding the test device for the combination of arc teeth and spur teeth, the previous technology is to establish the test method and corresponding test device from the perspective of gear parts fatigue durability, failure mode, etc., but not from the perspective of load characteristics; it is impossible to conduct relevant life tests under complex load conditions, and the traditional accelerated life test evaluation based on parts mostly uses constant stress, step stress, and progressive stress loading tests, which cannot fully reflect the performance degradation within multiple element action units, the coupling effect between element action units, and the life evaluation under high and low stress cycles. Therefore, it is necessary to design a test bench and test method that can be used for accelerated life tests of combined arc teeth and spur teeth under compound loading. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a combined gear accelerated life test bench and a test method thereof based on the meta-action theory, which can reflect the life evaluation of the combined gear under stress cycles.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A combined gear accelerated life test bench based on the meta-action theory, comprising a test bench, a motor is fixed on the top of the test bench, a coupling is connected to the output shaft of the motor, a magnetic powder clutch is connected to the other end of the coupling, a horizontally extending cylindrical gear shaft is connected to the other end of the magnetic powder clutch, a first bevel gear shaft is arranged on the side of the cylindrical gear shaft, the center line of the first bevel gear shaft is parallel to the center line of the cylindrical gear shaft, a first gear is mounted on the cylindrical gear shaft, a second gear meshing with the first gear is mounted on the first bevel gear shaft, a second bevel gear shaft is horizontally arranged on the side of the first bevel gear shaft, the center line of the second bevel gear shaft is perpendicular to the center line of the first bevel gear shaft, the first bevel gear on the first bevel gear shaft is meshed with the second bevel gear on the second bevel gear shaft, and a spur gear is mounted on the second bevel gear shaft;

[0007] The test bench is provided with a vertically arranged rack and a magnetic scale, the test bench is fixedly connected to a rack support bracket, the rack can be slidably connected to the rack support bracket in the up and down directions, the spur gear is meshed with the rack, the magnetic scale includes a magnetic scale and a read head, the magnetic scale is fixedly connected to the test bench and is located on one side of the rack, the read head is fixed on the rack, the magnetic scale can measure the displacement information of the read head in the up and down directions, a buffer spring is arranged below the rack, the bottom of the buffer spring is fixedly connected to the test bench, the lower end of the rack abuts against the top of the buffer spring, the test bench is also provided with an acceleration spring, the upper end of the acceleration spring is fixedly connected to the test bench, and the lower end is fixedly connected to a counterweight block, the counterweight block is suspended, and steel wire ropes fixedly connected to the bottom of the rack and the top of the counterweight block are arranged between them, and the steel wire ropes can provide vertical downward pulling force for the rack;

[0008] A first angular displacement encoder is installed at the end of the cylindrical gear shaft away from the magnetic powder clutch, a second angular displacement encoder is installed at the end of the first bevel gear shaft, and a third angular displacement encoder is installed at the end of the second bevel gear shaft. A first bracket, a second bracket and a third bracket connected to the cylindrical gear shaft, the first bevel gear shaft and the second bevel gear shaft for rotation support are fixedly connected to the test bench, respectively. A first vibration sensor, a second vibration sensor and a third vibration sensor are installed on the second bracket, the third bracket and the rack support bracket, respectively. A microprocessor is provided on the test bench, and the magnetic scale, the first angular displacement encoder, the second angular displacement encoder, the third angular displacement encoder, the first vibration sensor, the second vibration sensor and the third vibration sensor are electrically connected to the microprocessor, respectively.

[0009] When this solution is in use, the torque output by the motor is transmitted to the magnetic powder clutch through the coupling, and the magnetic powder clutch is then transmitted to the cylindrical gear shaft. The cylindrical gear shaft transmits the torque to the first bevel gear shaft through the meshing of the first gear and the second gear. The first bevel gear shaft transmits the torque to the second bevel gear shaft through the meshing of the first bevel gear and the second bevel gear. The second bevel gear shaft transmits the torque to the rack through the meshing of the spur gear and the rack. Driven by the spur gear, the rack moves up and down along the height direction of the test bench, and the counterweight is driven up and down by the wire rope on the rack. This state is normal operation under normal working conditions; when the motor is cut off by controlling the magnetic powder clutch to transmit the torque to the cylindrical gear shaft, the bottom of the rack can offset the buffer spring, and the buffer spring can play a buffering role when the gear falls, and the top of the counterweight is connected with an acceleration spring. The acceleration spring is part of the power source when the rod is quickly dropped in the simulation task stage. This state simulates an emergency situation when the power source is lost, and mechanical energy storage is required to complete the specified action. The accelerated life test of the composite loading of the counterweight free fall and the acceleration spring popping out can be carried out.

[0010] In this scheme, the first angular displacement encoder, the second angular displacement encoder and the third angular displacement encoder are installed on the shaft ends of the cylindrical gear shaft, the first bevel gear shaft and the second bevel gear shaft respectively, so as to monitor the angular displacement changes when the combined gears are meshing in real time, transmit the angular displacement change data to the microprocessor through the acquisition card, compare it with the angular displacement change of the encoder provided by the input motor, convert and compare it with the displacement measured by the rack magnetic scale, and analyze the degradation law of the performance indicators when the combined gears are meshing.

[0011] In this scheme, the first vibration sensor, the second vibration sensor and the third vibration sensor are respectively installed on the first bracket, the second bracket and the rack support bracket, and the amplitude data monitored by the first vibration sensor, the second vibration sensor and the third vibration sensor are transmitted to the microprocessor via the acquisition card, so as to analyze the vibration law of the second gear, the first bevel gear, the second bevel gear, the spur gear and the rack when they are loaded, and the rotation performance degradation data monitored by the first angular displacement encoder, the second angular displacement encoder and the third angular displacement encoder are combined with the rack displacement measured by the magnetic scale for conversion, and the life cycle of the combined gear under different loading conditions is evaluated in combination with the element-action life assessment method.

[0012] Furthermore, it also includes a support frame, the bottom of which is fixed to the test bench by bolts and nuts, and the first bracket, the second bracket and the third bracket are respectively installed on the support frame. In this solution, the support frame is used to support the first bracket, the second bracket and the third bracket.

[0013] Furthermore, the rack support bracket includes a vertical plate which is vertically arranged and fixedly connected to the test bench, the vertical plate is located on one side of the rack, and two support plates are fixedly connected to the side of the vertical plate facing the rack at intervals in the vertical direction, a rack support sleeve is provided on the support plate and is fixedly connected to the rack support sleeve body, the two rack support sleeves are arranged on the same center line and the center line extends in the vertical direction, the rack passes through the two rack support sleeves and can slide with them in the vertical direction, and the spur gear is meshed with the rack at a position between the two rack support sleeves.

[0014] In this solution, a rack support sleeve is used to limit the freedom of the rack, so that the rack can reciprocate in the rack support sleeve; a rack located between two rack support sleeves is meshed with a spur gear to ensure that the rack can mesh with the spur gear.

[0015] Furthermore, a rack flange seat which is arranged coaxially with the bottom of the rack is fixedly connected, and the rack flange seat abuts against the top of the buffer spring.

[0016] This design is to prevent the rack from directly contacting and passing through the buffer spring during the downward movement, causing the buffer spring to fail.

[0017] Furthermore, a vertically arranged sleeve is fixedly connected to the test bench, the upper end of the sleeve is open, the buffer spring is placed on the bottom of the sleeve, and the rack flange seat is located in the sleeve and can slide with the sleeve in the vertical direction.

[0018] In this scheme, the sleeve is fixed to the horizontal plane at the bottom of the test bench by bolts and nuts to ensure that the sleeve is set vertically, and the buffer spring is set in the sleeve. When the rack moves up and down in the height direction, the rack will drive the rack flange seat to extend into the sleeve and resist the buffer spring, and the buffer spring can play a role in buffering the rack.

[0019] A test method for a combined gear acceleration life test bench based on the meta-action theory comprises the following steps:

[0020] Step 1, simulate the operation control of the whole machine: construct three elementary action units of the whole machine, namely, the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, wherein the bevel gear rotation unit represents the meshing coupling unit of the first bevel gear and the second bevel gear, the combined gear rotation unit represents the second bevel gear and the spur gear and the second bevel gear shaft rotation unit, and the rack moving unit represents the meshing coupling unit of the spur gear and the rack;

[0021] Then, the three element actions in the whole machine are applied in different whole machine operating environments of double stress, single stress and variable stress. Among them, double stress represents the rising function of the whole machine, and the tooth surface of the second bevel gear and the first bevel gear in the bevel gear rotation unit, the tooth surface of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surface of the spur gear and the rack in the rack moving unit are subjected to uniform stress in both clockwise and counterclockwise directions. Single stress represents the hovering function of the whole machine, and the tooth surface of the second bevel gear and the first bevel gear in the bevel gear rotation unit is , the tooth surfaces of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surfaces of the spur gear and the rack in the rack moving unit are subjected to clockwise or counterclockwise unidirectional stress, and the variable stress represents the whole machine material replacement function, under different load conditions, the tooth surfaces of the second bevel gear and the first bevel gear in the bevel gear rotation unit, the tooth surfaces of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surfaces of the spur gear and the rack in the rack moving unit are subjected to different clockwise and counterclockwise bidirectional stresses;

[0022] Step 2: Establish the error expression model of the meta-action unit: Use the screw theory to express the spatial posture error of the meta-action unit within a cycle, as shown in formula (1), where θ = (δα, δβ, δγ) T Indicates the small change vector in the rotation direction of the bevel gear rotating unit and the combined gear rotating unit, υ=(dx,dy,dz) T Indicates the small change vector in the moving direction of the rack moving unit;

[0023]

[0024] In the whole machine, the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, continuously run for t task cycles, and obtain N period meta-action unit spatial posture errors T. The N meta-action unit spatial posture errors T are accumulated to construct the meta-action error expression model, as shown in Formula 2, where Δe o Denotes the cumulative error value of the meta-action unit assembly, Δe a1 Denotes tooth thickness error, Δe s Indicates tooth profile error, Δe p1 Indicates the radial eccentricity error of the gear, Δe g Indicates the center distance deviation;

[0025] Δe w (t) = Δe o +Δe a1 +Δe s +Δe p1 +Δe g (2);

[0026] Step 3, triggering the failure mode of the meta-action unit: using the FMA decomposition method to decompose the whole machine of double stress, single stress and variable stress according to "function-motion-action" to obtain three meta-action units: bevel gear rotation unit, combined gear rotation unit and rack moving unit, and determine the failure mode of the three meta-action units in the whole machine through the kinematic equation;

[0027] According to the lifting function, rod dropping function and material changing function of the whole machine and the performance parameter requirements of the whole machine, the performance parameter failure thresholds of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, are determined by using the performance mapping method. When the performance parameter thresholds of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, reach the failure thresholds, the corresponding fault modes of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, are triggered through the meta-action error expression model.

[0028] Step 4: Formulate a task plan: According to the existing design specifications of different complete machines, obtain the task history and operating load of the combined gear in the complete machine, draw the stress profile and load profile of the spur gear tooth surface in the combined gear, and use a mixed loading method of progressive stress and step stress to load the combined gear. The loading stress level is selected as 120%, 130% and 140% of the actual working conditions, and the accelerated life test operation cycle is set to 3 task cycles, and the complete machine is tested to see if it can operate normally during these 3 task cycles;

[0029] Step 5, accelerated life test operation: when the whole machine operates normally within 3 task cycles, the test is terminated; otherwise, a cyclic test is performed according to the task plan and load distribution diagram, the motor is started, the output shaft of the motor drives the cylindrical gear shaft to rotate, the cylindrical gear shaft drives the first bevel gear shaft to rotate through the meshing of the first gear and the second gear, the first bevel gear shaft drives the second bevel gear shaft to rotate through the meshing of the first bevel gear and the second bevel gear, the second bevel gear shaft drives the rack up and down through the meshing of the spur gear and the rack, and then the rack vibration signal, the combined gear vibration signal and the cylindrical gear vibration signal are measured by the first vibration sensor, the second vibration sensor and the third vibrator, the angular displacement change of the combined gear when meshing is monitored by the first angular displacement encoder, the second angular displacement encoder and the third angular displacement encoder, the rack displacement change is detected by the magnetic scale, when the performance parameter threshold reaches the performance parameter failure threshold, the corresponding fault mode of the cone is triggered by the meta-action error expression model, that is, a fault occurs, and the corresponding fault data is collected, the test is truncated for time or number of times, the test is stopped, the number of faults occurring in the experimental cycle is recorded, the cumulative number of faults is accumulated, the cumulative failure rate is calculated, and a test report is formed.

[0030] Further, in step four, the stress profile diagram is a diagram with the timeline as the horizontal coordinate and the action execution changes of the rising function, the hovering function and the descending function as the vertical coordinate, so as to obtain the stress task profile of the spur gear in the combined gear, and analyze the stress-time changes of the spur gear in the combined gear; the load profile diagram is a diagram with the timeline as the horizontal coordinate and the changes of the descending function and the rising function as the vertical coordinate, so as to obtain the load profile diagram of the spur gear in the combined gear, and analyze the load-time changes of the spur gear in the combined gear.

[0031] Furthermore, in step five, before conducting the accelerated life test, the test bench is debugged to determine the transmission position of each component of the test bench. It is necessary to ensure that the second bevel gear shaft is installed at 90 degrees to the first bevel gear shaft, and confirm whether the first angular displacement encoder, the second angular displacement encoder, the third angular displacement encoder, the first vibration sensor, the second vibration sensor, the third vibration sensing magnetic scale and the magnetic powder brake are normal, and whether their monitoring parameter functions are normal.

[0032] Furthermore, in step five, when the test is truncated at a certain time or number of times, the test is stopped, and the test fault data is processed. The life distribution of different complete machines is assumed to be a Weibull distribution, and the result data is compared with the error model of the combined gear element action unit. The data is processed, and the actual failure mode of the unit is obtained based on the data characteristics, the unit failure mechanism is analyzed, and an experimental report is formed.

[0033] Furthermore, when processing the test fault data, it is necessary to eliminate the fault, reload it, and repeat the stress level test cycle.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] Compared with the existing technology, this test bench constructs three serial element action units, bevel gear rotation unit, combined gear rotation unit and rack moving unit. Starting from the function realization and structural characteristics of the whole machine, the screw theory is used to establish the spatial posture expression of the element action unit, and the error model considering the accumulation of assembly errors is established in combination with the kinematic equation of the unit. The failure mechanism analysis is carried out according to the error evolution process, and then the life cycle assessment of the combined gear is completed. For the rack moving element action unit, the rack is fixedly connected to the wire rope through the rack flange seat, and the wire rope changes direction through the upper pulley block and the lower pulley block. The end is fixedly connected to the counterweight block, and there is an acceleration spring at the upper end of the counterweight block, and a buffer spring at the lower part of the rack flange seat, which can be loaded in combination. A third vibration sensor is installed on the rack support bracket to monitor the amplitude change of the rack in real time; a magnetic scale is installed next to the rack to measure the movement position of the rack in real time.

[0036] For the combined gear rotation element action, the end face of the second bevel gear shaft monitors the angular displacement change in real time through the third angular displacement encoder. The second bevel gear shaft is supported by the second bracket, and the second vibration sensor is installed on the second bracket to monitor the amplitude change of the combined gear in real time.

[0037] For the bevel gear rotating element action unit, a second angular displacement encoder is installed on the end face of the first bevel gear shaft to monitor the angular displacement change in real time. The entire element action unit is supported by the first bracket and is installed on the first bracket together with the first vibration sensor.

[0038] This test bench can realize the actual task conditions of combined gears, composite loaded head input parts and tail input parts, and load different loads in real time. It can effectively restore the load distribution of the combined gears in the original equipment, collect the fault data of the meta-action unit, and compare it with the established error expression model that considers the accumulation of assembly errors. According to the error evolution process, the failure mechanism is analyzed, and then the life cycle of the combined gear is evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a front view of a combined gear acceleration life test bench based on the element action theory of the present invention;

[0040] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0041] Figure 3 It is a structural schematic diagram of the relationship between the cylindrical gear shaft, the first bevel gear shaft and the second bevel gear shaft in a combined gear accelerated life test bench based on the meta-action theory of the present invention;

[0042] Figure 4It is a schematic diagram of the supporting structure of the cylindrical gear shaft, the first bevel gear shaft and the second bevel gear shaft in a combined gear accelerated life test bench based on the meta-action theory of the present invention;

[0043] Figure 5 It is a flow chart of a test method of a combined gear acceleration life test bench based on the element action theory of the present invention;

[0044] Figure 6 It is the mission history of the whole machine in the test method of the combined gear acceleration life test bench based on the element action theory of the present invention;

[0045] Figure 7 A stress profile diagram of a spur gear tooth surface in a test method of a combined gear accelerated life test bench based on the element-action theory of the present invention;

[0046] Figure 8 The load profile diagram of the spur gear tooth surface in the test method of the combined gear accelerated life test bench based on the element-action theory of the present invention.

[0047] In the figure: magnetic scale 1, motor support frame 2, magnetic powder clutch 3, motor 4, coupling 5, acceleration spring 6, counterweight 7, sleeve 8, wire rope 9, rack flange seat 10, buffer spring 11, lower pulley group 12, test bench 13, rack support sleeve 14, second bevel gear shaft 15, first bevel gear shaft 16, cylindrical gear shaft 17, second angular displacement encoder 18, first vibration sensor 19, third angular displacement encoder 20, rack support bracket 21, third vibration sensor 22, second vibration sensor 23, first angular displacement encoder 24, rack 25. DETAILED DESCRIPTION

[0048] The present invention will be described below with reference to the accompanying drawings and embodiments.

[0049] This example: See Figure 1-Figure 4As shown, a combined gear acceleration life test bench based on the meta-action theory and a test method thereof, wherein the combined gear acceleration life test bench based on the meta-action theory includes a test bench 13, a motor 4 is fixed on the top of the test bench 13, a coupling 5 is connected to the output shaft of the motor 4, the other end of the coupling 5 is connected to the magnetic powder clutch 3, the other end of the magnetic powder clutch 3 is connected to a horizontally extending cylindrical gear shaft 17, a first bevel gear shaft 16 is arranged on the side of the cylindrical gear shaft 17, the center line of the first bevel gear shaft 16 is parallel to the center line of the cylindrical gear shaft 17, a first gear is mounted on the cylindrical gear shaft 17, a second gear meshing with the first gear is mounted on the first bevel gear shaft 16, a second bevel gear shaft 15 is horizontally arranged on the side of the first bevel gear shaft 16, the center line of the second bevel gear shaft 15 is perpendicular to the center line of the first bevel gear shaft 16, the first bevel gear on the first bevel gear shaft 16 is meshed with the second bevel gear on the second bevel gear shaft 15, and a spur gear is mounted on the second bevel gear shaft 15.

[0050] The test bench 13 is provided with a vertically arranged rack 25 and a magnetic scale 1. The test bench 13 is fixedly connected with a rack support bracket 21. The rack 25 can be slidably connected to the rack support bracket 21 in the up and down directions. The spur gear is meshed with the rack 25. The magnetic scale 1 includes a magnetic scale and a read head. The magnetic scale is fixedly connected to the test bench and is located on one side of the rack. The read head is fixed on the rack 25. The magnetic scale can measure the displacement information of the read head in the up and down directions. A buffer spring 11 is arranged below the rack 25. The bottom of the buffer spring 11 is fixedly connected to the test bench 13. The lower end of the rack 25 Abutting the top of the buffer spring 11, an acceleration spring 6 is also provided on the test bench 13. The upper end of the acceleration spring 6 is fixedly connected to the test bench 13, and the lower end is fixedly connected to the counterweight block 7. The counterweight block 7 is suspended. A steel wire rope 9 fixedly connected to the bottom of the rack 25 and the top of the counterweight block 7 is provided between them. The steel wire rope 9 can provide a vertical downward pulling force for the rack 25. An upper pulley block is installed on the top of the test bench 13, and a lower pulley block 12 is installed on the bottom. The steel wire rope 9 is wound around the upper pulley block and the lower pulley block 12, and the direction of the steel wire rope 9 is changed by the upper pulley block and the lower pulley block 12.

[0051] A first angular displacement encoder 24 is installed at the end of the cylindrical gear shaft 17 away from the magnetic powder clutch 3, a second angular displacement encoder 18 is installed at the end of the first bevel gear shaft 16, and a third angular displacement encoder 20 is installed at the end of the second bevel gear shaft 15. The test bench 13 is respectively fixed with a first bracket, a second bracket and a third bracket which are rotatably supported and connected to the cylindrical gear shaft 17, the first bevel gear shaft 16 and the second bevel gear shaft 15. The second bracket, the third bracket and the rack support bracket 21 are respectively installed with a first vibration sensor 19, a second vibration sensor 23 and a third vibration sensor 22. A microprocessor is provided on the test bench 13, and the magnetic scale 1, the first angular displacement encoder 24, the second angular displacement encoder 18, the third angular displacement encoder 20, the first vibration sensor 19, the second vibration sensor 23 and the third vibration sensor 22 are respectively electrically connected to the microprocessor.

[0052] When the present solution is in use, the torque output by the motor 4 is transmitted to the magnetic powder clutch 3 through the coupling 5, and the magnetic powder clutch 3 is then transmitted to the cylindrical gear shaft 17, and the cylindrical gear shaft 17 transmits the torque to the first bevel gear shaft 16 through the meshing of the first gear and the second gear, and the first bevel gear shaft 16 transmits the torque to the second bevel gear shaft 15 through the meshing of the first bevel gear and the second bevel gear, and the second bevel gear shaft 15 transmits the torque to the rack 25 through the meshing of the spur gear and the rack 25, and the rack 25 moves up and down along the height direction of the test bench 13 under the drive of the spur gear, and drives the counterweight 7 to move up and down through the wire rope 9 on the rack 25, and this state is normal operation under normal working conditions;

[0053] By controlling the magnetic powder clutch 3 to cut off the motor 4 and transmit the torque to the cylindrical gear shaft 17, the bottom of the rack 25 can be against the buffer spring 11, and the buffer spring 11 can play a buffering role when the gear falls. The top of the counterweight 7 is connected with an acceleration spring 6. The acceleration spring 6 is part of the power source when the rod falls quickly during the simulation task stage. This state simulates an emergency situation when the power source is lost, and mechanical energy storage is required to complete the specified action. The accelerated life test of the composite loading of the free fall of the counterweight 7 and the pop-up of the acceleration spring 6 can be carried out.

[0054] In this solution, the first angular displacement encoder 24, the second angular displacement encoder 18 and the third angular displacement encoder 20 are respectively installed on the shaft ends of the cylindrical gear shaft 17, the first bevel gear shaft 16 and the second bevel gear shaft 15, so as to monitor the angular displacement changes when the combined gears are meshing in real time, transmit the angular displacement change data to the microprocessor through the acquisition card, and then compare it with the angular displacement change of the encoder provided by the input end motor 4, and convert and compare it with the displacement measured by the magnetic scale 1 of the rack 25, so as to analyze the degradation law of the performance indicators when the combined gears are meshing.

[0055] In this scheme, the first vibration sensor 19, the second vibration sensor 23 and the third vibration sensor 22 are respectively installed on the first bracket, the second bracket and the rack support bracket 21, and the amplitude data monitored by the first vibration sensor 19, the second vibration sensor 23 and the third vibration sensor 22 are transmitted to the microprocessor via the acquisition card, so as to analyze the vibration law of the second gear, the first bevel gear, the second bevel gear, the spur gear and the rack 25 when they are loaded, and the rotation performance degradation data monitored by the first angular displacement encoder 24, the second angular displacement encoder 18 and the third angular displacement encoder 20 are combined with the rack 25 displacement measured by the magnetic scale 1 for conversion, and the life cycle of the combined gear under different loading conditions is evaluated in combination with the element action life assessment method.

[0056] Description: The combined gear in the device of the present invention is a combination of a spur gear and a second bevel gear.

[0057] It also includes a motor support frame 2 for supporting the motor 4, the bottom of the motor support frame 2 is fixedly installed on the horizontal plane of the test bench 13 by bolts and nuts; the magnetic powder clutch 3 is fixed on the first support frame by bolts and nuts, and the bottom of the first support frame is fixed on the horizontal plane of the test bench 13 by bolts and nuts.

[0058] Preferably, the rack support bracket 21 includes a vertical plate which is vertically arranged and fixedly connected to the test bench 13, the vertical plate is located on one side of the rack 25, and two support plates are fixedly connected to the side of the vertical plate facing the rack 25 at intervals in the vertical direction, a rack support sleeve 14 is provided on the support plate and is fixedly connected to the rack support sleeve 14 body, the two rack support sleeves 14 are arranged on the same center line and the center line extends in the vertical direction, the rack 25 passes through the two rack support sleeves 14 and can slide with them in the vertical direction, and the spur gear is meshed with the rack at a position between the two rack support sleeves.

[0059] In this solution, the rack support sleeve 14 is used to limit the freedom of the rack 25, so that the rack 25 can reciprocate in the rack support sleeve 14; the rack 25 located between the two rack support sleeves 14 is meshed with the spur gear to ensure that the rack 25 can mesh with the spur gear.

[0060] Preferably, a rack flange seat 10 which is arranged coaxially with the bottom of the rack 25 is fixedly connected, and the rack flange seat 10 abuts against the top of the buffer spring 11 .

[0061] This design is to prevent the rack 25 from directly contacting and passing through the buffer spring 11 during the downward movement, causing the buffer spring 11 to be ineffective.

[0062] Secondly, the rack flange seat 10 is connected to the bottom of the rack 25, and the mounting hole on the rack flange seat 10 is provided for the wire rope 9 to pass through, and the wire rope 9 is fixed in the mounting hole. When the rack 25 moves up and down, the rack flange seat 10 will be driven to move up and down, and then the wire rope 9 will be pulled to drive the counterweight 7 to move.

[0063] Preferably, a vertically arranged sleeve 8 is fixedly connected to the test bench 13, the upper end of the sleeve 8 is open, the buffer spring 11 is placed on the bottom of the sleeve 8, and the rack flange seat 10 is located in the sleeve and can slide with the sleeve 8 in the vertical direction.

[0064] In this solution, the sleeve 8 is fixed to the horizontal plane at the bottom of the test bench 13 by bolts and nuts to ensure that the sleeve 8 is vertically arranged, and the buffer spring 11 is arranged in the sleeve 8. When the rack 25 moves up and down in the height direction, the rack 25 will drive the rack flange seat 10 to extend into the sleeve 8 and resist against the buffer spring 11, and the buffer spring 11 can play a role in buffering the rack 25.

[0065] See also Figure 5-Figure 8 As shown, the present invention extracts three meta-action units in the motion chain according to the functions of different complete equipment where the combined gear is located, analyzes the structural composition of the meta-action units corresponding to the above three meta-actions, and builds the above-mentioned combined gear acceleration life test bench based on the meta-action theory. According to the different task conditions of the above-mentioned complete equipment, the test bench of the present invention is used to simulate the load and transmission efficiency of the combined gear under different task conditions, and carry out the life test of the combined gear.

[0066] A test method for a combined gear acceleration life test bench based on the meta-action theory comprises the following steps:

[0067] Step 1, simulate the operation control of the whole machine: construct three elementary action units of the whole machine, namely, the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, wherein the bevel gear rotation unit represents the meshing coupling unit of the first bevel gear and the second bevel gear, the combined gear rotation unit represents the second bevel gear and the spur gear and the second bevel gear shaft rotation unit, and the rack moving unit represents the meshing coupling unit of the spur gear and the rack;

[0068] Then, the three element actions in the whole machine are applied in different whole machine operating environments of double stress, single stress and variable stress. Among them, double stress represents the rising function of the whole machine, and the tooth surface of the second bevel gear and the first bevel gear in the bevel gear rotation unit, the tooth surface of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surface of the spur gear and the rack in the rack moving unit are subjected to uniform stress in both clockwise and counterclockwise directions. Single stress represents the hovering function of the whole machine, and the tooth surface of the second bevel gear and the first bevel gear in the bevel gear rotation unit is , the tooth surfaces of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surfaces of the spur gear and the rack in the rack moving unit are subjected to clockwise or counterclockwise unidirectional stress, and the variable stress represents the whole machine material replacement function, under different load conditions, the tooth surfaces of the second bevel gear and the first bevel gear in the bevel gear rotation unit, the tooth surfaces of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surfaces of the spur gear and the rack in the rack moving unit are subjected to different clockwise and counterclockwise bidirectional stresses;

[0069] Step 2: Establish the error expression model of the meta-action unit: Use the screw theory to express the spatial posture error of the meta-action unit within a cycle, as shown in formula (1), where θ = (δα, δβ, δγ) T Indicates the small change vector in the rotation direction of the bevel gear rotating unit and the combined gear rotating unit, υ=(dx,dy,dz) T Indicates the small change vector in the moving direction of the rack moving unit;

[0070]

[0071] In the whole machine, the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, continuously run for t task cycles, and obtain N period meta-action unit spatial posture errors T. The N meta-action unit spatial posture errors T are accumulated to construct the meta-action error expression model, as shown in Formula 2, where Δe o Denotes the cumulative error value of the meta-action unit assembly, Δe a1 Denotes tooth thickness error, Δe s Indicates tooth profile error, Δe p1 Indicates the radial eccentricity error of the gear, Δe g Indicates the center distance deviation;

[0072] Δe w (t) = Δe o +Δe a1 +Δe s +Δe p1 +Δe g (2);

[0073] Step 3, triggering the failure mode of the meta-action unit: using the FMA decomposition method to decompose the whole machine of double stress, single stress and variable stress according to "function-motion-action" to obtain three meta-action units: bevel gear rotation unit, combined gear rotation unit and rack moving unit, and determine the failure mode of the three meta-action units in the whole machine through the kinematic equation;

[0074] According to the lifting function, rod dropping function and material changing function of the whole machine and the performance parameter requirements of the whole machine, the performance parameter failure thresholds of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, are determined by using the performance mapping method. When the performance parameter thresholds of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, reach the failure thresholds, the corresponding fault modes of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, are triggered through the meta-action error expression model; the fault modes of the bevel gear rotation unit and the combined gear rotation unit are shown in Table 1; the fault modes of the rack moving unit are shown in Table 2;

[0075] Table 1 Failure modes of bevel gear transmission unit and combination gear transmission unit

[0076] Serial number Failure Mode Serial number Failure Mode 1 No Action 4 Angular velocity fluctuation exceeds the limit 2 Insufficient angular displacement 5 Offset exceeded 3 Angular velocity is too slow

[0077] Table 2 Failure modes of rack moving unit

[0078] Serial number Failure Mode Serial number Failure Mode 1 No Action 4 Speed ​​fluctuation exceeds the limit 2 Insufficient displacement 5 Offset exceeded 3 Too slow

[0079] Step 4: Formulate a task plan: According to the existing design specifications of different complete machines, obtain the task history and operating load of the combined gear in the complete machine, draw the stress profile and load profile of the spur gear tooth surface in the combined gear, and use a mixed loading method of progressive stress and step stress to load the combined gear. The loading stress level is selected as 120%, 130% and 140% of the actual working conditions, and the accelerated life test operation cycle is set to 3 task cycles, and the complete machine is tested to see if it can operate normally during these 3 task cycles;

[0080] Step 5, accelerated life test operation: when the whole machine operates normally within 3 task cycles, the test is terminated; otherwise, a cyclic test is performed according to the task plan and load distribution diagram, the motor is started, the output shaft of the motor drives the cylindrical gear shaft to rotate, the cylindrical gear shaft drives the first bevel gear shaft to rotate through the meshing of the first gear and the second gear, the first bevel gear shaft drives the second bevel gear shaft to rotate through the meshing of the first bevel gear and the second bevel gear, the second bevel gear shaft drives the rack up and down through the meshing of the spur gear and the rack, and then the rack vibration signal, the combined gear vibration signal and the cylindrical gear vibration signal are measured by the first vibration sensor, the second vibration sensor and the third vibrator, the angular displacement change of the combined gear when meshing is monitored by the first angular displacement encoder, the second angular displacement encoder and the third angular displacement encoder, the rack displacement change is detected by the magnetic scale, when the performance parameter threshold reaches the performance parameter failure threshold, the corresponding fault mode of the cone is triggered by the meta-action error expression model, that is, a fault occurs, and the corresponding fault data is collected, the test is truncated for time or number of times, the test is stopped, the number of faults occurring in the experimental cycle is recorded, the cumulative number of faults is accumulated, the cumulative failure rate is calculated, and a test report is formed.

[0081] Preferably, in step four, the stress profile diagram is a diagram with the timeline as the horizontal coordinate and the changes in the execution of the rising function, the hovering function and the descending function as the vertical coordinate, so as to obtain the stress task profile of the spur gear in the combination gear, and analyze the stress-time changes of the spur gear in the combination gear; the load profile diagram is a diagram with the timeline as the horizontal coordinate and the changes in the descending function and the rising function as the vertical coordinate, so as to obtain the load profile diagram of the spur gear in the combination gear, and analyze the load-time changes of the spur gear in the combination gear.

[0082] Preferably, in step five, before conducting the accelerated life test, the test bench is debugged to determine the transmission position of each component of the test bench, to ensure that the second bevel gear shaft is installed at 90 degrees to the first bevel gear shaft, to confirm whether the first angular displacement encoder, the second angular displacement encoder, the third angular displacement encoder, the first vibration sensor, the second vibration sensor, the third vibration sensing magnetic scale and the magnetic powder brake are normal, and whether their monitoring parameter functions are normal.

[0083] Preferably, in step five, when the test is truncated at a certain time or number of times, the test is stopped, and the test fault data is processed. The life distribution of different whole machines is assumed to be a Weibull distribution, and the result data is compared with the error model of the combined gear element action unit. The data is processed, and the actual failure mode of the unit is obtained based on the data characteristics, the unit failure mechanism is analyzed, and an experimental report is formed.

[0084] Preferably, when processing the test fault data, it is necessary to eliminate the fault, reload, and repeat the stress level test cycle.

[0085] The test method of the present invention combines the functions of a control rod drive mechanism complete equipment, constructs three elementary action units including a bevel gear rotation unit, a combined gear rotation unit and a rack movement unit, establishes an error expression model considering the accumulation of assembly errors, and completes the life assessment of the combined gear in combination with failure mechanism analysis.

[0086] The accelerated life test of this test bench is carried out according to the test task profile, tooth surface stress load profile and load loading profile. After starting the drive motor of the test bench, the bevel gear rotates in the ascending direction of the aforementioned drive mechanism until it rotates N circles (corresponding to the aforementioned drive mechanism moving upward 1200mm), the motor is turned off for a delay of 3s and then restarted, the bevel gear rotates in the descending direction of the aforementioned drive mechanism until it rotates N circles (corresponding to the aforementioned drive mechanism moving downward 1200mm), the motor is turned off for a delay of 3s and then restarted, the bevel gear rotates in the ascending direction of the aforementioned drive mechanism, after rotating N circles, the motor is turned off for a delay of 3S and then restarted, and then rotates in the descending direction of the aforementioned drive mechanism. After repeating this action k times, the motor is turned off for a delay of 3s, turn off the motor, and complete the task of simulating the actual normal working condition of the test bench; after completing the above experiment, start the drive motor of the test bench, and the bevel gear rotates in the ascending direction of the above drive mechanism until it rotates N circles (corresponding to the above drive mechanism moving upward 1200mm), turn off the motor and delay for 3s, then control the magnetic powder clutch to cut off the transmission chain, and the entire transmission chain is driven by the gravity of the counterweight load and the elastic force of the acceleration spring to start accelerating down, until the rack flange seat stops falling and returns to a static state under the elastic force of the buffer spring, and after a delay of 3s, control the magnetic powder clutch to close the transmission chain and start the drive motor, cycle this action k times, and then turn off the motor to complete the task of simulating the actual rapid rod drop operation process of the test bench. After completing the above full round of task cycles, change the wire rope pulling load mass, and load 120%, 130%, and 140% of the load mass and repeat the above test task cycle again.

[0087] Collect test failure data, write accelerated life test reports for combined gears, and evaluate the life cycles of arc and spur gear combinations based on meta-motion theory.

[0088] In summary, the present invention realizes the meshing transmission process of the combined gear under simulated actual working conditions, designs corresponding power transmission parts and supporting fastener parts based on the structural characteristics of the elementary action unit, and assembles these parts together to realize the meshing of three transmission pairs, and installs different types of sensors on the power transmission parts and supporting fasteners respectively to realize real-time monitoring of input parameters and output parameters when the transmission pairs are meshed. At the same time, the present invention determines the task profile, tooth surface stress load and load profile of the test bench in combination with the task distribution and load distribution of the whole equipment where the combined gear is located, laying a foundation for evaluating the reliability of the combined gears of arc teeth and spur teeth and implementing the reliability evaluation test procedure.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A combined gear acceleration life test bench based on the meta-action theory, characterized in that: A test bench is included, wherein a motor is fixed on the top of the test bench, a coupling is connected to the output shaft of the motor, a magnetic powder clutch is connected to the other end of the coupling, a horizontally extending cylindrical gear shaft is connected to the other end of the magnetic powder clutch, a first bevel gear shaft is provided on the side of the cylindrical gear shaft, a center line of the first bevel gear shaft is parallel to the center line of the cylindrical gear shaft, a first gear is mounted on the cylindrical gear shaft, a second gear meshing with the first gear is mounted on the first bevel gear shaft, a second bevel gear shaft is horizontally arranged on the side of the first bevel gear shaft, a center line of the second bevel gear shaft is perpendicular to the center line of the first bevel gear shaft, a first bevel gear on the first bevel gear shaft is meshed with a second bevel gear on the second bevel gear shaft, and a spur gear is mounted on the second bevel gear shaft; The test bench is provided with a vertically arranged rack and a magnetic scale, the test bench is fixedly connected to a rack support bracket, the rack can be slidably connected to the rack support bracket in the up and down directions, the spur gear is meshed with the rack, the magnetic scale includes a magnetic scale and a read head, the magnetic scale is fixedly connected to the test bench and is located on one side of the rack, the read head is fixed on the rack, the magnetic scale can measure the displacement information of the read head in the up and down directions, a buffer spring is arranged below the rack, the bottom of the buffer spring is fixedly connected to the test bench, the lower end of the rack abuts against the top of the buffer spring, the test bench is also provided with an acceleration spring, the upper end of the acceleration spring is fixedly connected to the test bench, and the lower end is fixedly connected to a counterweight block, the counterweight block is suspended, and steel wire ropes fixedly connected to the bottom of the rack and the top of the counterweight block are arranged between them, and the steel wire ropes can provide vertical downward pulling force for the rack; A first angular displacement encoder is installed at the end of the cylindrical gear shaft away from the magnetic powder clutch, a second angular displacement encoder is installed at the end of the first bevel gear shaft, and a third angular displacement encoder is installed at the end of the second bevel gear shaft. A first bracket, a second bracket and a third bracket connected to the cylindrical gear shaft, the first bevel gear shaft and the second bevel gear shaft for rotation support are fixedly connected to the test bench, respectively. A first vibration sensor, a second vibration sensor and a third vibration sensor are installed on the second bracket, the third bracket and the rack support bracket, respectively. A microprocessor is provided on the test bench, and the magnetic scale, the first angular displacement encoder, the second angular displacement encoder, the third angular displacement encoder, the first vibration sensor, the second vibration sensor and the third vibration sensor are electrically connected to the microprocessor, respectively.

2. The combined gear accelerated life test bench based on the meta-action theory according to claim 1 is characterized in that: It also includes a support frame, the bottom of which is fixed to the test bench through bolts and nuts, and the first bracket, the second bracket and the third bracket are respectively installed on the support frame.

3. The combined gear accelerated life test bench based on the meta-action theory according to claim 1 is characterized in that: The rack support bracket includes a vertical plate which is vertically arranged and fixedly connected to the test bench, the vertical plate is located on one side of the rack, and two support plates are fixedly connected to the side of the vertical plate facing the rack at intervals in the vertical direction, a rack support sleeve is provided on the support plate and is fixedly connected to the rack support sleeve body, the two rack support sleeves are arranged on the same center line and the center line extends in the vertical direction, the rack passes through the two rack support sleeves and can slide with them in the vertical direction, and the spur gear is meshed with the rack at a position between the two rack support sleeves.

4. The combined gear accelerated life test bench based on the meta-action theory according to claim 1 is characterized in that: The bottom of the rack is fixedly connected with a rack flange seat arranged on the same center line, and the rack flange seat abuts against the top of the buffer spring.

5. The combined gear accelerated life test bench based on the meta-action theory according to claim 4 is characterized in that: A vertically arranged sleeve is fixedly connected to the test bench, the upper end of the sleeve is open, the buffer spring is placed on the bottom of the sleeve, and the rack flange seat is located in the sleeve and can slide with the sleeve in the vertical direction.

6. A test method for a combined gear acceleration life test bench based on the meta-action theory, characterized in that: The combined gear accelerated life test bench based on the meta-action theory according to any one of claims 1 to 5 comprises the following steps: Step 1, simulate the operation control of the whole machine: construct three elementary action units of the whole machine, namely, the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, wherein the bevel gear rotation unit represents the meshing coupling unit of the first bevel gear and the second bevel gear, the combined gear rotation unit represents the second bevel gear and the spur gear and the second bevel gear shaft rotation unit, and the rack moving unit represents the meshing coupling unit of the spur gear and the rack; Then, the three element actions in the whole machine are applied in different whole machine operating environments of double stress, single stress and variable stress. Among them, double stress represents the rising function of the whole machine, and the tooth surface of the second bevel gear and the first bevel gear in the bevel gear rotation unit, the tooth surface of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surface of the spur gear and the rack in the rack moving unit are subjected to uniform stress in both clockwise and counterclockwise directions. Single stress represents the hovering function of the whole machine, and the tooth surface of the second bevel gear and the first bevel gear in the bevel gear rotation unit is , the tooth surfaces of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surfaces of the spur gear and the rack in the rack moving unit are subjected to clockwise or counterclockwise unidirectional stress, and the variable stress represents the whole machine material replacement function, under different load conditions, the tooth surfaces of the second bevel gear and the first bevel gear in the bevel gear rotation unit, the tooth surfaces of the second bevel gear shaft to the second bevel gear and the spur gear in the combined gear rotation unit, and the tooth surfaces of the spur gear and the rack in the rack moving unit are subjected to different clockwise and counterclockwise bidirectional stresses; Step 2: Establish the error expression model of the meta-action unit: Use the screw theory to express the spatial posture error of the meta-action unit within a cycle, as shown in formula (1), where θ = (δα, δβ, δγ) T Indicates the small change vector in the rotation direction of the bevel gear rotating unit and the combined gear rotating unit, υ=(dx,dy,dz) T Indicates the small change vector in the moving direction of the rack moving unit; In the whole machine, the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, continuously run for t task cycles, and obtain N period meta-action unit spatial posture errors T. The N meta-action unit spatial posture errors T are accumulated to construct the meta-action error expression model, as shown in Formula 2, where Δe o Denotes the cumulative error value of the meta-action unit assembly, Δe a1 Denotes tooth thickness error, Δe s Indicates tooth profile error, Δe p1 Indicates the radial eccentricity error of the gear, Δe g Indicates the center distance deviation; Δe w (t)=Δe o +Δe a1 +Δe s +Δe p1 +Δe g (2); Step 3: Triggering the failure mode of the meta-action unit: Using the FMA decomposition method, the whole machine with double stress, single stress and variable stress is decomposed according to "function-motion-action" to obtain three meta-action units: the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit. The failure modes of the three meta-action units in the whole machine are determined by the kinematic equations; According to the lifting function, rod dropping function and material changing function of the whole machine and the performance parameter requirements of the whole machine, the performance parameter failure thresholds of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, are determined by using the performance mapping method. When the performance parameter thresholds of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, reach the failure thresholds, the corresponding fault modes of the three meta-action units, namely the bevel gear rotation unit, the combined gear rotation unit and the rack moving unit, are triggered through the meta-action error expression model. Step 4: Formulate a task plan: According to the existing design specifications of different complete machines, obtain the task history and operating load of the combined gear in the complete machine, draw the stress profile and load profile of the spur gear tooth surface in the combined gear, and use a mixed loading method of progressive stress and step stress to load the combined gear. The loading stress level is selected as 120%, 130% and 140% of the actual working conditions, and the accelerated life test operation cycle is set to 3 task cycles, and the complete machine is tested to see if it can operate normally during these 3 task cycles; Step 5, accelerated life test operation: when the whole machine operates normally within 3 task cycles, the test is terminated; otherwise, a cyclic test is performed according to the task plan and load distribution diagram, the motor is started, the output shaft of the motor drives the cylindrical gear shaft to rotate, the cylindrical gear shaft drives the first bevel gear shaft to rotate through the meshing of the first gear and the second gear, the first bevel gear shaft drives the second bevel gear shaft to rotate through the meshing of the first bevel gear and the second bevel gear, the second bevel gear shaft drives the rack up and down through the meshing of the spur gear and the rack, and then the rack vibration signal, the combined gear vibration signal and the cylindrical gear vibration signal are measured by the first vibration sensor, the second vibration sensor and the third vibrator, the angular displacement change of the combined gear when meshing is monitored by the first angular displacement encoder, the second angular displacement encoder and the third angular displacement encoder, the rack displacement change is detected by the magnetic scale, when the performance parameter threshold reaches the performance parameter failure threshold, the corresponding fault mode of the cone is triggered by the meta-action error expression model, that is, a fault occurs, and the corresponding fault data is collected, the test is truncated for time or number of times, the test is stopped, the number of faults occurring in the experimental cycle is recorded, the cumulative number of faults is accumulated, the cumulative failure rate is calculated, and a test report is formed.

7. The test method of the combined gear acceleration life test bench based on the meta-action theory according to claim 6 is characterized in that: In step four, the stress profile diagram is a diagram with the timeline as the horizontal coordinate and the action execution changes of the rising function, hovering function and descending function as the vertical coordinate, so as to obtain the stress task profile of the spur gear in the combined gear, and analyze the stress-time changes of the spur gear in the combined gear; the load profile diagram is a diagram with the timeline as the horizontal coordinate and the changes of the descending function and the rising function as the vertical coordinate, so as to obtain the load profile diagram of the spur gear in the combined gear, and analyze the load-time changes of the spur gear in the combined gear.

8. The test method of the combined gear acceleration life test bench based on the meta-action theory according to claim 6 is characterized in that: In step five, before conducting the accelerated life test, the test bench is debugged to determine the transmission position of each component of the test bench. It is necessary to ensure that the second bevel gear shaft is installed at 90 degrees to the first bevel gear shaft. Confirm whether the first angular displacement encoder, the second angular displacement encoder, the third angular displacement encoder, the first vibration sensor, the second vibration sensor, the third vibration sensor magnetic scale and the magnetic powder brake are normal, and whether their monitoring parameter functions are normal.

9. The test method of the combined gear acceleration life test bench based on the meta-action theory according to claim 6 is characterized in that: In step five, when the test is truncated at a certain time or number of times, the test is stopped and the test fault data is processed. The life distribution of different complete machines is assumed to be a Weibull distribution. The result data is compared with the error model of the combined gear element action unit, and the data is processed. The actual failure mode of the unit is obtained based on the data characteristics, the unit failure mechanism is analyzed, and an experimental report is formed.

10. The test method of the combined gear acceleration life test bench based on the meta-action theory according to claim 9 is characterized in that: When processing test fault data, it is necessary to eliminate the fault, reload, and repeat the stress level test cycle.

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