CN110411761B - automatic tension wheel reliability verification test bed - Google Patents
automatic tension wheel reliability verification test bed Download PDFInfo
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- CN110411761B CN110411761B CN201910914733.9A CN201910914733A CN110411761B CN 110411761 B CN110411761 B CN 110411761B CN 201910914733 A CN201910914733 A CN 201910914733A CN 110411761 B CN110411761 B CN 110411761B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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Abstract
The invention discloses an automatic tension pulley reliability verification test bed which comprises a frame body, wherein a mounting base plate is arranged on the frame body, a main driving wheel, an automatic tension pulley and a generator belt pulley are rotatably connected onto the mounting base plate, the input end of the main driving wheel is connected with a driving motor, the output end of the generator belt pulley is connected with the input end of a generator, an eccentric idler wheel is arranged between the main driving wheel and the automatic tension pulley and is rotatably connected onto the mounting base plate, and the main driving wheel, the eccentric idler wheel, the automatic tension pulley and the generator belt pulley are connected through a poly-wedge belt.
Description
Technical Field
The invention relates to the technical field of automobile part detection, in particular to automatic tension pulley reliability verification test beds.
Background
The tensioning wheel on the automobile mainly comprises a fixed shell, a tensioning arm, a wheel body, a torsion spring, a rolling bearing, a spring shaft sleeve and the like, and can automatically adjust the tensioning force according to different tightness degrees of a belt, so that a transmission system is stable, safe and reliable.
In the existing tension pulley test bed, the driving wheel is an eccentric wheel, the eccentric wheel drives the tension pulley to swing times when the driving wheel rotates circles, the condition is inconsistent with the excitation of ignition for multiple times when an engine rotates circles, and therefore the condition that the automatic tension pulley is impacted in the automatic tension pulley reliability test process is inconsistent with the actual condition.
Therefore, it is a technical problem to be solved by those skilled in the art how to provide kinds of automatic tensioning wheel reliability verification test benches, so that the frequency of the variable force applied to the automatic tensioning wheel is equal to the ignition excitation frequency of revolutions of the engine, so that the simulation of the variable force of the test benches is closer to the practical application, and the accuracy of the test result is improved.
Disclosure of Invention
In view of the above, the invention provides automatic tensioning wheel reliability verification test benches, so that the frequency of the variable force applied to the automatic tensioning wheel is equal to the ignition excitation frequency of revolutions of the engine, the simulation of the variable force is closer to the actual application, and the accuracy of the test result is higher.
In order to achieve the purpose, the invention provides the following technical scheme:
automatic tension pulley reliability verification test bed comprises a frame body, wherein a mounting base plate is arranged on the frame body, a main driving wheel, an automatic tension pulley and a generator belt pulley are rotatably connected onto the mounting base plate, the input end of the main driving wheel is connected with a driving motor, the output end of the generator belt pulley is connected with the input end of a generator, an eccentric idler wheel is arranged between the main driving wheel and the automatic tension pulley, the eccentric idler wheel is rotatably connected onto the mounting base plate, and the main driving wheel, the eccentric idler wheel, the automatic tension pulley and the generator belt pulley are connected through a multi-wedge belt.
Preferably, a base plate is detachably connected to the mounting base plate, a mounting base is mounted on the base plate, and the eccentric idler pulley and the automatic tensioning wheel are rotatably connected to the mounting base.
Preferably, a sealed test chamber is arranged on the front surface of the mounting base plate, the main driving wheel, the eccentric idler wheel, the automatic tensioning wheel and the generator pulley are all arranged in the test chamber, and the driving motor and the generator are arranged on the back surface of the mounting base plate.
Preferably, the mounting base plate sets up the upper portion of support body, the lower part of support body is provided with the backup pad, fixedly connected with water pump and water tank in the backup pad, the entry of water pump with the water tank intercommunication, the export of water pump leads to pipe and nozzle intercommunication, the nozzle sets up in the test chamber.
Preferably, the water pump comprises a clean water pump and a sewage pump, the water tank comprises a clean water tank and a sewage tank, an inlet of the clean water pump is communicated with the clean water tank, an outlet of the clean water pump is communicated with the clean water nozzle through a th water pipe, the clean water nozzle is arranged in the test chamber, an inlet of the sewage pump is communicated with the sewage tank, an outlet of the sewage pump is communicated with the sewage nozzle through a second water pipe, and the sewage nozzle is arranged in the test chamber.
Preferably, a clean water valve is arranged on the th water pipe, and a sewage valve is arranged on the second water pipe.
Preferably, be provided with the dust box on the support body, the export of dust box and negative-pressure air fan's entry intercommunication, negative-pressure air fan's export passes through dust pipeline and dust nozzle intercommunication, the dust nozzle sets up in the test cavity.
Preferably, the heating box is arranged on the frame body, an outlet of the heating box is communicated with an inlet of the hot air blower, an outlet of the hot air blower is communicated with a hot air outlet through a heat conveying pipeline, the hot air outlet is arranged in the test chamber, a hot air inlet is arranged in the test chamber, and the hot air inlet is communicated with the heating box through an output pipeline.
Preferably, the test chamber is provided with a temperature detection device, a test end of the temperature detection device is arranged in the test chamber, the temperature detection device is electrically connected with an input end of the controller, and an output end of the controller is electrically connected with the heating box.
Preferably, an opening is formed in the side wall of the test chamber, a chamber is connected to the opening, a sealing strip is arranged at the edge of the chamber close to the side of the opening, and the arrangement position of the sealing strip corresponds to the frame of the opening.
According to the technical scheme, the main driving wheel of the automatic tensioning wheel reliability verification test bench is of a non-eccentric structure, the eccentric idle wheel is arranged between the main driving wheel and the automatic tensioning wheel, the eccentric idle wheel provides variable force for the V-ribbed belt, the V-ribbed belt transmits the variable force to the automatic tensioning wheel, the ratio of the number of rotation turns of the eccentric idle wheel to the main driving wheel is adjusted to be equal to the ignition excitation frequency of turns of the engine, the frequency of the variable force applied to the automatic tensioning wheel is equal to the ignition excitation frequency of turns of the engine, the stress simulation of the automatic tensioning wheel is closer to the actual application, and the accuracy of the test result is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic front structural diagram of an automatic tension wheel reliability verification test bed provided in an embodiment of the present invention;
FIG. 2 is a structural schematic diagram of sides of an automatic tensioner reliability verification test bed provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of another side surfaces of an automatic tensioner reliability verification test bed provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a back side of an automatic tension pulley reliability verification test bed provided in an embodiment of the present invention;
fig. 5 is a diagram of arrangements during an automatic tensioner test provided by an embodiment of the present invention;
fig. 6 is a diagram of another layout patterns during an automatic tensioner test provided by an embodiment of the invention.
Detailed Description
The invention discloses an automatic tension pulley reliability verification test bench, which enables the frequency of variable force applied to an automatic tension pulley to be equal to the ignition excitation frequency of circles of engine rotation, enables the simulation of the variable force to be closer to the actual application, and enables the accuracy of the test result to be higher.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.
Referring to fig. 1 to 6, the invention discloses an automatic tension pulley reliability verification test bed, which comprises a frame body 8.
Wherein, the frame body 8 is formed by welding rectangular steel pipes or channel steel. The frame body 8 is connected with an installation bottom plate 6 in a welding or threaded connection mode. The mounting bottom plate 6 is rotatably connected with a main driving wheel 7, an automatic tension wheel 2 and a generator belt pulley 1. The input end of the main driving wheel 7 is connected with the output shaft of the driving motor 17, and the driving motor 17 drives the main driving wheel 7 to rotate. The output end of the generator belt pulley 1 is connected with the input end of the generator 18, and the generator belt pulley 1 drives the generator 18 to rotate. An eccentric idle wheel 5 is arranged between the main driving wheel 7 and the automatic tensioning wheel 2, the eccentric idle wheel 5 is rotationally connected to the mounting base plate 6, and the main driving wheel 7, the eccentric idle wheel 5, the automatic tensioning wheel 2 and the generator belt wheel 1 are connected through a poly-wedge belt 25.
The automatic tensioning wheel 2 can automatically adjust the belt tension of the front end wheel system of the engine according to the difference of the operation working conditions of the engine and the change of the length of the belt, and the stability and reliability of the operation of the front end wheel system are ensured.
in the embodiment, the eccentric idler pulley 5 is connected by bearings to a shaft that is attached to the mounting plate 6. the main drive wheel 7 and the generator pulley 1 are connected to respective shafts that are attached by bearings to the mounting plate 6.
The automatic tension wheel reliability verification test bench of the invention has the advantages that the main driving wheel 7 is of a non-eccentric structure, the eccentric idler wheel 5 is arranged between the main driving wheel 7 and the automatic tension wheel 2, the eccentric idler wheel 5 provides variable force to the V-ribbed belt 25, the V-ribbed belt 25 transmits the variable force to the automatic tension wheel 2, the ratio of the number of rotation turns of the eccentric idler wheel 5 and the main driving wheel 7 is adjusted to be equal to the ignition excitation frequency of turns of the engine, the frequency of the variable force applied to the automatic tension wheel 2 is equal to the ignition excitation frequency of turns of the engine, the stress simulation of the automatic tension wheel 2 is closer to the practical application, the accuracy of the test result is higher,
to facilitate adjustment of the mounting positions of the automatic tensioner 2 and the eccentric idler 5 on the mounting base plate 6, the base plate 3 is detachably attached to the mounting base plate 6. In order to adjust the angle of the automatic tensioning wheel 2 and the eccentric idler wheel 5 relative to the mounting base plate 6 conveniently, a mounting base 4 is detachably mounted on the base plate 3, and the eccentric idler wheel 5 and the automatic tensioning wheel 2 are rotatably connected to the mounting base 4. The above-mentioned detachable means that the connection is made by bolt and nut or screw and nut.
Specifically, a plurality of th connecting through holes are formed in the mounting base plate 6, a second connecting through hole and a plurality of third connecting through holes are formed in the substrate 3, and a fourth connecting through hole is formed in the mounting base plate 4. the substrate 3 and the mounting base plate 6 are connected through bolts passing through the th connecting through hole and the second connecting through hole and nuts connected to the bolts, and the mounting base plate 4 and the substrate 3 are connected through bolts passing through the fourth connecting through hole and the third connecting through hole.
Meanwhile, the plurality of connecting through holes are formed in the mounting base plate 6, so that the test bench can simultaneously check a plurality of groups of automatic tensioning wheels 2, and simultaneously realize the adjustment of the arrangement positions of the automatic tensioning wheels 2 and the eccentric idler wheels 5, as shown in fig. 1, 4 groups of automatic tensioning wheels 2 are arranged on the test bench from the left, and the positions of the 4 groups of automatic tensioning wheels 2 are arranged clockwise from the left, wherein the automatic tensioning wheels 2 are arranged on the upper side, the eccentric idler wheels 5 are arranged on the lower side, the automatic tensioning wheels 2 are arranged on the right side, the eccentric idler wheels 5 are arranged on the left side, the automatic tensioning wheels 2 are arranged on the lower side, the eccentric idler wheels 5 are arranged on the upper side, the automatic tensioning wheels 2 are arranged.
In order to avoid the influence of the external environment on the test result and improve the accuracy of the test result, a sealed test chamber is arranged on the front surface of the mounting base plate 6, the main driving wheel 7, the eccentric idler wheel 5, the automatic tensioning wheel 2 and the generator pulley 1 are all arranged in the test chamber, and the driving motor 17 and the generator 18 are arranged on the back surface of the mounting base plate 6, wherein the front surface is an surface of the mounting base plate 6 provided with the test wheel train, and the mounting base plate 6 is side surfaces of the test chamber.
Step , the mounting base plate 6 is arranged on the upper portion of the frame body 8, the support plate 26 is arranged on the lower portion of the frame body 8, the water pump 15 and the water tank 12 are fixedly connected to the support plate 26, the inlet of the water pump 15 is communicated with the water tank 12, the outlet of the water pump 15 is communicated with the nozzle 10 through the water pipe 16, and the nozzle 10 is arranged in the test chamber.
, the water pump 15 includes a clean water pump and a sewage pump, the water tank 12 includes a clean water tank and a sewage tank, the inlet of the clean water pump is connected with the clean water tank, the outlet of the clean water pump is connected with a clean water nozzle through a th water pipe, the clean water nozzle is arranged in the test chamber, thereby simulating the test environment of drenching, the inlet of the sewage pump is connected with the sewage tank, the outlet of the sewage pump is connected with a sewage nozzle through a second water pipe, the sewage nozzle is arranged in the test chamber, thereby simulating the test environment of drenching slurry, the clean water nozzle and the sewage nozzle are respectively provided with a plurality of nozzles, in order to prevent the clean water nozzle from being polluted or blocked by the slurry water sprayed by the sewage nozzle, the water spray effect of the clean water nozzle is influenced, and the height of the clean water nozzle is not lower than that of the sewage nozzle.
Wherein, a clear water valve 13 is arranged on the th water pipe, a sewage valve 14 is arranged on the second water pipe, and the sewage nozzle and the clear water nozzle are both arranged on the upper part of the automatic tensioning wheel.
In the manual mode, the clean water valve 13 and the sewage valve 14 are manually closed or opened to control whether to spray.
In another specific embodiment, the automatic tension pulley reliability verification test bench of the invention further comprises a controller, wherein the clean water valve 13 and the sewage valve 14 are both electromagnetic valves, the electromagnetic valves are both electrically connected with the controller, the controller is connected with a power supply, and the controller is used for controlling the opening and closing of the electromagnetic valves.
The driving motor 17 is a variable frequency motor or a servo motor, the controller is electrically connected with the driving motor 17, and the controller is used for controlling the rotating speed of the driving motor 17. Specifically, the controller is a PLC.
, a dust box 22 is arranged on the frame body 8, an outlet of the dust box 22 is communicated with an inlet of a negative pressure fan (not shown), an outlet of the negative pressure fan is communicated with a dust nozzle 19 through a dust pipeline 20, the dust nozzle 19 is arranged in the test chamber, in order to control the communication or the closing of the dust pipeline 20, a dust electromagnetic valve 21 is connected on the dust pipeline 20, the dust electromagnetic valve 21 is electrically connected with the controller, the negative pressure fan is electrically connected with the controller, and the controller is used for controlling the working or non-working of the negative pressure fan.
In order to simulate different test temperature environments, a heating box 24 is arranged on the frame body 8, an outlet of the heating box 24 is communicated with an inlet of a hot air fan 23, an outlet of the hot air fan 23 is communicated with a hot air outlet 11 through a heat conveying pipeline, the hot air outlet 11 is arranged in the test chamber, a hot air inlet 9 is further arranged in the test chamber, the hot air inlet 9 is communicated with the heating box 24 through an output pipeline, so that hot air is recycled, the heat energy utilization rate is improved, and the test device can be prevented from being damaged by excessive pressure in the test chamber.
The testing chamber is provided with a temperature detection device (not shown in the figure), the testing end of the temperature detection device is arranged in the testing chamber, and the temperature detection device is electrically connected with the controller. The temperature detection device is a temperature sensor or a thermocouple. Temperature-detecting device is used for detecting temperature in the test chamber, works as when air temperature in the test chamber is less than the lower limit of settlement, controller control heating cabinet 24 begins to heat, and the air after the heating supplyes and fills in the test chamber, monitor as temperature-detecting device air temperature in the test chamber reaches when setting for the upper limit requirement, controller control heating cabinet 24 stops the heating, thereby realizes right the temperature control of test chamber makes temperature in the test chamber is in suitable set value within range all the time.
In order to adjust the installation positions of the substrate 3 and the installation base 4 conveniently, an opening is formed in the side wall of the test chamber opposite to the installation bottom plate 6, a chamber is connected to the opening, and in order to improve the sealing performance, a sealing strip is arranged on the side, close to the side of the opening, of the edge of the chamber , and the arrangement position of the sealing strip corresponds to the frame of the opening.
Through above structure setting for automatic take-up pulley reliability verification test bench can simulate spare part and the operating mode that has an influence to automatic take-up pulley 2 among the practical application, and automatic take-up pulley 2 arranges between generator 18 and eccentric idler 5, makes automatic take-up pulley 2 be in the most harsh operating condition all the time, thereby has improved the reliability of test result.
By adding the eccentric idler wheel 5, the rotation circle ratio of the eccentric idler wheel 5 and the driving wheel system is equal to the ignition excitation frequency of circles of the engine, so that the experimental simulation working condition is closer to the practical application.
The integrated heating function of this laboratory bench simulates practical application's environmental problem for the temperature of experimental environment is adjustable, and the function of integrated dust, trickle and mud spray can simulate the service condition of different environment.
The test bench disclosed by the invention comprehensively considers different operation working conditions of the front-end gear train of the engine, so that the comprehensiveness of the examination can be realized, the simulation working condition of the bench is closer to the actual working condition, and the accuracy and the reliability of the test result are improved.
In the description of the present solution, it is to be understood that the terms "upper", "lower", "vertical", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present solution.
Thus, a feature defined as "", "second" may explicitly or implicitly include or more of that feature.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Claims (10)
- The test bed for verifying the reliability of the automatic tensioning wheels comprises a frame body (8) and is characterized in that a mounting base plate (6) is arranged on the frame body (8), a main driving wheel (7), the automatic tensioning wheels (2) and a generator belt wheel (1) are connected to the mounting base plate (6) in a rotating mode, the input end of the main driving wheel (7) is connected with a driving motor (17), the output end of the generator belt wheel (1) is connected with the input end of a generator (18), an eccentric idler wheel (5) is arranged between the main driving wheel (7) and the automatic tensioning wheels (2), the eccentric idler wheel (5) is connected to the mounting base plate (6) in a rotating mode, the main driving wheel (7), the eccentric idler wheel (5), the automatic tensioning wheels (2) and the generator belt wheel (1) are connected through a multi-wedge belt (25), and the number of turns of the ratio of the eccentric idler wheel (5) to the rotation of the main driving wheel (7) is adjusted to be equal to the.
- 2. The automatic tensioner reliability verification test stand according to claim 1, characterized in that a base plate (3) is detachably connected to the mounting base plate (6), a mounting base (4) is mounted on the base plate (3), and the eccentric idler (5) and the automatic tensioner (2) are rotatably connected to the mounting base (4).
- 3. The automatic tensioner reliability verification test stand according to claim 1, characterized in that the front face of the mounting base plate (6) is provided with a sealed test chamber, the main drive wheel (7), the eccentric idler wheel (5), the automatic tensioner (2) and the generator pulley (1) are all disposed within the test chamber, and the drive motor (17) and the generator (18) are disposed on the back face of the mounting base plate (6).
- 4. The automatic tensioning wheel reliability verification test bench according to claim 3, wherein the mounting base plate (6) is arranged at the upper part of the frame body (8), a support plate (26) is arranged at the lower part of the frame body (8), a water pump (15) and a water tank (12) are fixedly connected to the support plate (26), an inlet of the water pump (15) is communicated with the water tank (12), an outlet of the water pump (15) is communicated with a nozzle (10) through a water pipe (16), and the nozzle (10) is arranged in the test chamber.
- 5. The automatic tensioning wheel reliability verification test bench according to claim 4, characterized in that the water pump (15) comprises a clean water pump and a sewage pump, the water tank (12) comprises a clean water tank and a sewage tank, an inlet of the clean water pump is communicated with the clean water tank, an outlet of the clean water pump is communicated with a clean water nozzle through a -th water pipe, the clean water nozzle is arranged in the test chamber, an inlet of the sewage pump is communicated with the sewage tank, an outlet of the sewage pump is communicated with the sewage nozzle through a second water pipe, and the sewage nozzle is arranged in the test chamber.
- 6. The automatic tensioning wheel reliability verification test bed according to claim 5, characterized in that a clean water valve (13) is arranged on the th water pipe, and a sewage valve (14) is arranged on the second water pipe.
- 7. The automatic tensioning wheel reliability verification test bench according to claim 3, characterized in that a dust box (22) is arranged on the frame body (8), an outlet of the dust box (22) is communicated with an inlet of a negative pressure fan, an outlet of the negative pressure fan is communicated with a dust nozzle (19) through a dust pipeline (20), and the dust nozzle (19) is arranged in the test chamber.
- 8. The automatic tensioning wheel reliability verification test bench according to claim 3, wherein a heating box (24) is arranged on the frame body (8), an outlet of the heating box (24) is communicated with an inlet of a hot air fan (23), an outlet of the hot air fan (23) is communicated with a hot air outlet (11) through a heat transmission pipeline, the hot air outlet (11) is arranged in the test chamber, a hot air inlet (9) is arranged in the test chamber, and the hot air inlet (9) is communicated with the heating box (24) through an output pipeline.
- 9. The automatic tensioner reliability verification test stand according to claim 8, characterized in that a temperature detection device is arranged on the test chamber, a testing end of the temperature detection device is arranged inside the test chamber, the temperature detection device is electrically connected with an input end of a controller, and an output end of the controller is electrically connected with the heating box (24).
- 10. The automatic tensioning wheel reliability verification test bench according to claim 3, wherein an opening is formed in a side wall of the test chamber, a chamber is connected to the opening, a sealing strip is arranged on the side of the edge of the chamber , and the position of the sealing strip corresponds to the frame of the opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910914733.9A CN110411761B (en) | 2019-09-26 | 2019-09-26 | automatic tension wheel reliability verification test bed |
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| CN201910914733.9A CN110411761B (en) | 2019-09-26 | 2019-09-26 | automatic tension wheel reliability verification test bed |
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| CN110411761A CN110411761A (en) | 2019-11-05 |
| CN110411761B true CN110411761B (en) | 2020-01-31 |
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| CN201910914733.9A Active CN110411761B (en) | 2019-09-26 | 2019-09-26 | automatic tension wheel reliability verification test bed |
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| CN112945114B (en) * | 2021-01-15 | 2023-04-07 | 东风柳州汽车有限公司 | Belt elasticity detection mechanism and car |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20014686U1 (en) * | 2000-03-13 | 2001-01-11 | Cm Digit Gmbh & Co Kg | Measuring device for quality inspection of gear wheels and / or number shafts |
| US6609988B1 (en) * | 2001-05-24 | 2003-08-26 | The Gates Corporation | Asymmetric damping tensioner belt drive system |
| CN102494896B (en) * | 2011-12-13 | 2013-09-25 | 成都嘉陵华西光学精密机械有限公司 | Comprehensive simulation experiment system and method for engine front-end wheel train |
| CN203606057U (en) * | 2013-11-09 | 2014-05-21 | 中国第一汽车股份有限公司 | Engine idle pulley load dynamic measuring device |
| CN205317475U (en) * | 2016-01-28 | 2016-06-15 | 宁波市鄞州德来特技术有限公司 | Motor head train test equipment's testboard |
| CN208297119U (en) * | 2018-06-28 | 2018-12-28 | 人本集团有限公司 | Tension wheel shaft bearing simulation experiment device |
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