A test bench for simulating clearance fault of rotating pair of rotating machinery

Abstract

The present invention discloses an experimental platform for simulating the clearance fault of a rotating pair of a rotating machine, comprising a bracket, on which a power module, an experimental module and a measuring module are arranged; the experimental module comprises a crank, a pin, a slide bar, a slide rail and a slider, one end of the pin is fixed on the crank, the other end of the pin is slidably connected with the slide bar, the slide rail is slidably arranged on the slider, and one end of the slide rail is fixedly connected with the slide bar; the power module drives the crank to rotate, the crank drives the pin to rotate around the central axis of the crank, the pin slides on the slide bar, so that the slide rail connected with the slide bar moves along the length direction of the slider; the measuring module is used to measure the displacement state of the slide rail and the crank. The present invention can accurately simulate the fault condition when the clearance of the rotating pair of the rotating machine exists, and has a simple structure, low manufacturing cost and is easy to implement.

Description

Technical Field

[0001] The invention relates to an experimental device, in particular to an experimental table for simulating clearance faults of rotating pairs of rotating machinery. Background Art

[0002] With the advent of the era of intelligent manufacturing, the complexity of mechanical parts and the requirements of the times for efficient production of enterprises are constantly increasing. In today's enterprise production, the clearance between the two components of the main transmission mechanism of the processing equipment is increasing due to wear under long-term work, especially the rotating components. The increased clearance causes the unstable operation of the transmission mechanism, resulting in the substandard quality of the products processed by the processing equipment and increasing the production cost. Therefore, the detection of the clearance of the transmission mechanism is an important issue. However, the main transmission mechanism of most processing equipment is in a closed or semi-closed working environment, the processing equipment is not easy to disassemble, and the fault diagnosis is difficult. Directly measuring and studying the clearance of the transmission mechanism on the actual processing equipment is too labor-intensive and difficult to implement. Therefore, if there is a corresponding gap fault simulation test bench, it is possible to simulate the occurrence of gap faults on the test bench without disassembling the original production equipment, and collect and study the data of the series of changes in this case, and finally verify it on the actual original production equipment, which is relatively time-saving and labor-saving. The existing rotating machinery fault simulation test benches are basically used in industrial production and scientific research and other fields. The whole machine is relatively mature and the manufacturing cost is high. In addition, most rotating machinery test benches are aimed at simulating common faults such as gears, bearings, friction, etc., and their functions are limited. It is difficult to simulate the fault conditions when there is a clearance between the rotating pairs of rotating machinery.

[0003] In response to the above problems, this patent proposes a test bench for simulating clearance faults in rotating pairs of rotating machinery. Summary of the invention

[0004] The purpose of the present invention is to provide a test bench for simulating the fault of the rotating pair clearance of a rotating machine. The present invention can accurately simulate the fault condition when the rotating pair clearance of the rotating machine exists, has a simple structure, low manufacturing cost and is easy to implement.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an experimental platform for simulating the clearance fault of a rotating pair of a rotating machinery, comprising a bracket, on which a power module, an experimental module and a measuring module are arranged; the experimental module comprises a crank, a pin shaft, a slide bar, a slide rail and a slider, one end of the pin shaft is fixed to the crank, and the other end of the pin shaft is slidably connected to the slide bar, the slide rail is slidably arranged on the slider, and one end of the slide rail is fixedly connected to the slide bar; the power module drives the crank to rotate, and the crank drives the pin shaft to rotate around the central axis of the crank, and the pin shaft slides on the slide bar, so that the slide rail connected to the slide bar moves along the length direction of the slider; the measuring module is used to measure the displacement state of the slide rail and the crank.

[0006] Preferably, the slide bar is in the shape of an elongated circular ring, a slide hole is provided on the slide bar, a first bearing is installed at the end of the pin shaft, and the first bearing is slidably disposed in the slide hole.

[0007] Preferably, a holder is provided on the side of the slide bar, a slot is provided on the holder, one end of the slide rail is embedded in the slot and has an interference fit with the slot, and the end of the slide rail is locked in the slot by a locking screw.

[0008] Preferably, the bracket is provided with a slider mounting seat, the slider mounting seat is provided with a slider mounting groove, the slider is embedded in the slider mounting groove, and the slider is fixed in the slider mounting groove via a locking screw.

[0009] Preferably, the power module includes a speed regulating motor, a driving pulley, a driven pulley, a synchronous belt and a transmission shaft. The speed regulating motor is fixed to the bracket by screws, and the motor shaft of the speed regulating motor is connected to the driving pulley. The bracket is also provided with a bearing seat, and a second bearing is installed on the bearing seat. The transmission shaft passes through the second bearing, one end of the transmission shaft is connected to the crank, and the other end of the transmission shaft is connected to the driven pulley, and the synchronous belt is covered on the driving pulley and the driven pulley.

[0010] Preferably, a threaded portion is provided at one end of the transmission shaft close to the crank, and a limiting step is provided at the inner end of the threaded portion. A first fixing hole and a second fixing hole are provided on the crank. The threaded portion of the transmission shaft passes through the first fixing hole, and a locking nut is threadedly connected to the threaded portion. The crank is pressed onto the limiting step of the transmission shaft through the locking nut, and one end of the pin shaft passes through the second fixing hole and is interference fit with the second fixing hole.

[0011] Preferably, the bracket is provided with a first probe seat, a second probe seat and a camera seat, the measuring module includes a first laser displacement sensor installed on the first probe seat, a second laser displacement sensor installed on the second probe seat and an infrared thermal imager installed on the camera seat, and the first laser displacement sensor is located above the highest position from the horizontal plane during the rotation of the crank, the second laser displacement sensor is located above the left limit of the horizontal displacement of the slide rail, and the infrared thermal imager is opposite to the slide bar and the first bearing; the first laser displacement sensor, the second laser displacement sensor and the infrared thermal imager are all electrically connected to the PC end.

[0012] Preferably, a third bearing is mounted on the first probe seat, and the transmission shaft passes through the third bearing.

[0013] Preferably, the first probe seat is provided with a first strip hole extending vertically, the first laser displacement sensor is connected to a first slide seat, the first slide seat is penetrated with a first adjusting screw, and the bottom end of the first adjusting screw is fixed to the first strip hole; the second probe seat is provided with a second strip hole extending vertically, the second laser displacement sensor is connected to a second slide seat, the second slide seat is penetrated with a second adjusting screw, and the bottom end of the second adjusting screw is fixed to the second strip hole; the camera seat is provided with a third strip hole extending vertically, the infrared thermal imager is connected to a slide plate, the slide plate is penetrated with a third adjusting screw, and the bottom end of the third adjusting screw is fixed to the third strip hole.

[0014] Preferably, a fourth strip-shaped hole is horizontally opened on the bracket, a fourth adjusting screw is passed through the second probe seat, and the bottom end of the fourth adjusting screw is fixed to the fourth strip-shaped hole.

[0015] Technical effects and advantages of the present invention:

[0016] 1. The test bench of the present invention mainly includes a power module, an experimental module and a measuring module arranged on a bracket. The crank, pin, slide bar, slide rail and slider in the experimental module form a sinusoidal mechanism. One end of the pin is fixed on the crank, and the other end of the pin is slidably connected to the slide bar. The matching clearance between the slide bar and the pin can be controlled automatically. The slide rail is slidably arranged on the slider, and one end of the slide rail is fixedly connected to the slider. The crank is driven to rotate by the power module, and the crank drives the pin to rotate around the central axis of the crank. The pin slides on the slide bar, so that the slide rail connected to the slide bar moves along the length direction of the slider. The measuring module is used to measure the displacement state of the slide rail and the crank, that is, under controllable clearance conditions, the displacement curve of the slide rail and the crank can be obtained by the measuring module, which is convenient for the subsequent post-processing of the corresponding displacement curve, so as to accurately simulate the fault condition when the clearance of the rotating pair of the rotating machinery exists. In addition, the present invention has the advantages of simple structure, low manufacturing cost and easy implementation.

[0017] 2. The cooperation between the pin and the slide bar of the present invention is realized by the first bearing. The power of the transmission shaft makes the crank and the pin connected to the crank rotate synchronously. The bearing installed on the pin slides between the slide bars, so that the slide rail connected to the slide bar can move horizontally in the slider. At the same time, in order to realize the self-control of the matching clearance of the rotating pair, since the first bearing is a standard part, its outer ring is a fixed size, and slide bars with different sliding hole sizes are processed to achieve the effect of accurately controlling the matching clearance of the rotating pair.

[0018] 3. The end of the slide rail of the present invention is embedded in the slot of the side holder of the slide bar, and the end of the slide rail is fastened to the slot of the holder by a locking screw, thereby realizing a fixed connection between the slide rail and the slide bar. This connection method has a good fixing effect and is very convenient for disassembly and assembly.

[0019] 4. The present invention provides a slider installation groove on the slider mounting seat, and the slider is embedded in the slider installation groove for pre-positioning, which can make the installation position of the slider more accurate. The slider is then fixed in the slide groove by a locking screw, thereby achieving accurate installation of the slider, allowing the sliding trajectory of the slide rail to be accurately measured and reducing system errors.

[0020] 5. The speed regulating motor of the present invention drives the driving pulley, synchronous belt and driven pulley to operate, so as to achieve the effect of transmitting the power of the speed regulating motor to the rotating shaft. The frequency modulation and speed regulation of the speed regulating motor itself and the two pulleys with different transmission ratios can achieve multi-level speed adjustment, and can affect the rotating pair of the rotating machinery with gap under different speed conditions.

[0021] 6. The threaded portion of the transmission shaft of the present invention passes through the first fixing hole on the crank. The crank and the transmission shaft are linked by screwing the locking nut into the threaded portion of the transmission shaft and pressing the crank onto the limiting step of the transmission shaft. The pin passes through the second fixing hole of the crank and is interference fit with the second fixing hole to achieve a fixed connection between the pin and the crank. The above connection method is simple and detachable, and disassembly and assembly are very convenient.

[0022] 7. The present invention sets two measuring points of laser displacement sensors in the experimental bench. One of them is placed above the highest horizontal point during the rotation of the crank to measure the displacement curve of the crank. The other is placed above the left limit of the horizontal displacement of the slide rail to measure the displacement curve of the slide rail. The two laser displacement sensors are connected to the PC end, which can monitor and save the corresponding displacement curve parameters in real time, which is convenient for the subsequent post-processing of the corresponding displacement curve. The linkage between the bearing on the pin shaft and the slide bar of the present invention is a non-closed environment, and the size of the gap affects the heat transfer caused by the collision and movement between the first bearing and the slide bar. The infrared thermal imager can be used to collect information of the red thermal image, and the collected image information is used as data preparation for subsequent machine learning.

[0023] 8. The present invention installs a third bearing on the first probe seat, and the transmission shaft passes through the third bearing. The second bearing and the third bearing are fulcrums at both ends of the transmission shaft, which can make the rotation of the transmission shaft more stable, and the rotation of the transmission shaft on the bearing can greatly reduce friction loss, which has the advantage of being more energy-saving.

[0024] 9. The first laser displacement sensor, the second laser displacement sensor and the infrared thermal imager of the present invention can be adjusted up and down by corresponding adjustment screws, so that they can be adjusted to the most suitable angle and accurately measure the experimental data.

[0025] 10. The present invention can change the installation position of the second probe seat according to the left limit position of the slide rail by adjusting the fourth adjusting screw, so that the second laser displacement sensor on the second probe seat is accurately installed just above the left limit position of the slide rail, thereby accurately measuring the displacement curve of the slide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a rear view of the present invention;

[0028] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0029] Figure 4 It is a cross-sectional view of the transmission shaft and the crank when they are matched;

[0030] Figure 5 It is a schematic diagram of the installation structure of the first laser displacement sensor of the present invention;

[0031] Figure 6 is a schematic diagram of the installation structure of the second laser displacement sensor of the present invention;

[0032] Figure 7 It is a schematic diagram of the installation structure of the camera holder of the present invention;

[0033] Figure 8 A motion diagram of the experimental module of the present invention;

[0034] Fig. 9 This is a left side view of the present invention after the bracket is removed;

[0035] Fig.10 The invention is a flow chart for detecting the clearance fault of the rotating pair of a rotating machinery.

[0036] In the figure: 1, bracket; 2, universal wheel; 3, speed regulating motor; 4, synchronous belt; 5, bearing seat; 6, second bearing; 7, transmission shaft; 8, first probe seat; 9, third bearing; 10, crank; 11, pin shaft; 12, slide bar; 13, first bearing; 14, slider mounting seat; 15, slider; 16, slide rail; 17, second probe seat; 18, first laser displacement sensor; 19, second laser displacement sensor; 20, camera seat; 21, infrared thermal imager; 22, driving pulley; 23, driven pulley ; 24. Sliding hole; 25. Card seat; 26. Card slot; 27. First fixing hole; 28. Second fixing hole; 29. ​​Threaded portion; 30. Limiting step; 31. Locking nut; 32. First sliding seat; 33. First strip hole; 34. First adjusting screw; 35. Second sliding seat; 36. Second adjusting screw; 37. Fourth strip hole; 38. Fourth adjusting screw; 39. Slide plate; 40. Third strip hole; 41. Third adjusting screw; 42. Slider mounting slot; 43. Locking screw; 44. Second strip hole. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The present invention provides the following Figure 1-10The test bench for simulating clearance faults of rotating pairs of rotating machinery shown in the figure includes a bracket 1. The bracket 1 is a profile bracket 1. The top of the bracket 1 has a support plate. The construction of the corresponding height of the bracket 1 meets the humanized design requirements. The bottom of the bracket 1 is provided with a universal wheel 2 to help the experimenter complete the transportation of the test bench. The bracket 1 is provided with a power module, an experimental module and a measurement module; the experimental module includes a crank 10, a pin 11, a slide bar 12, a slide rail 16 and a slider 15. The crank 10, the pin 11, the slide bar 12, the slide rail 16 and the slider 15 form a sinusoidal mechanism. One end of the pin 11 is fixed to the crank 10, and the other end of the pin 11 is slidably connected to the slide bar 12. The matching clearance between the slide bar 12 and the pin 11 can be controlled automatically. The slide rail 16 is slidably arranged on the slider 15, and one end of the slide rail 16 is fixedly connected to the slide bar 12; the power module drives the crank 10 to rotate, and the crank 10 rotates. The handle 10 drives the pin 11 to rotate around the central axis of the crank 10, and the pin 11 slides on the slide bar 12, so that the slide rail 16 connected to the slide bar 12 moves along the length direction of the slider 15; the measuring module is used to measure the displacement state of the slide rail 16 and the crank 10, that is, under controllable clearance conditions, the displacement curves of the slide rail 16 and the crank 10 can be obtained through the measuring module, which is convenient for the subsequent post-processing of the corresponding displacement curves, thereby accurately simulating the fault condition when the rotating pair clearance of the rotating machinery exists, and the present invention has the advantages of simple structure, low manufacturing cost and easy implementation.

[0039] As attached Figure 3 As shown, the slide bar 12 is in the shape of an elongated ring, and a slide hole 24 is provided on the slide bar 12. The end of the pin shaft 11 is installed with a first bearing 13, and the first bearing 13 is slidably arranged in the slide hole 24. The cooperation between the pin shaft 11 and the slide bar 12 is realized by the first bearing 13. The power of the transmission shaft 7 makes the crank 10 and the pin shaft 11 connected to the crank 10 perform synchronous rotation movement, and the bearing installed on the pin shaft 11 slides between the slide bars 12, so that the slide rail 16 connected to the slide bar 12 can move horizontally in the slider 15. At the same time, in order to realize the self-control of the matching clearance of the rotating pair, since the first bearing 13 is a standard part, its outer ring is a fixed size, and the slide bars 12 with different sizes of slide holes 24 are processed to achieve the effect of accurately controlling the matching clearance of the rotating pair, so that the matching clearance of the slide bar 12 and the bearing can be changed between 0.05 and 1.00 mm.

[0040] As attached Figure 3 As shown, a holder 25 is provided on the side of the slide bar 12, and a slot 26 is provided on the holder 25. One end of the slide rail 16 is embedded in the slot 26 and has an interference fit with the slot 26, and the end of the slide rail 16 is locked in the slot 26 by a locking screw 43, thereby realizing a fixed connection between the slide rail 16 and the slide bar 12. This connection method has a good fixing effect and is very convenient for disassembly and assembly.

[0041] As attached Figure 2 As shown, the bracket 1 is provided with a slider mounting seat 14, and the slider mounting seat 14 is provided with a slider mounting groove 42. The slider 15 is embedded in the slider mounting groove 42 for pre-positioning, which can make the installation position of the slider 15 more accurate, and the slider 15 is fixed in the slider mounting groove 42 by a locking screw 43, thereby realizing accurate installation of the slider 15, and the sliding trajectory of the slide rail 16 can be accurately measured, thereby reducing system errors.

[0042] As attached Figure 1 and attached Figure 2 As shown, the power module includes a speed regulating motor 3, a driving pulley 22, a driven pulley 23, a synchronous belt 4 and a transmission shaft 7. The speed regulating motor 3 is fixed to the bracket 1 by screws, and the motor shaft of the speed regulating motor 3 is connected to the driving pulley 22. The bracket 1 is also provided with a bearing seat 5, and a second bearing 6 is installed on the bearing seat 5. The transmission shaft 7 passes through the second bearing 6. One end of the transmission shaft 7 is connected to the crank 10, and the other end of the transmission shaft 7 is connected to the driven pulley 23. The synchronous belt 4 is wrapped around the driving pulley 22 and the driven pulley 23. Under certain conditions, the speed change range of the speed regulating motor 3 can be realized by adjusting the transmission ratio of the driving pulley 22 and the driven pulley 23, that is, the effective circle diameter of the driving pulley 22 and the driven pulley 23 as shown in the figure.

[0043] As attached Figure 3 and attached Figure 4 As shown, a threaded portion 29 is provided at one end of the transmission shaft 7 close to the crank 10, and a limiting step 30 is provided at the inner end of the threaded portion 29. A first fixing hole 27 and a second fixing hole 28 are provided on the crank 10. The threaded portion 29 of the transmission shaft 7 passes through the first fixing hole 27, and a locking nut 31 is threadedly connected to the threaded portion 29. The crank 10 is pressed onto the limiting step 30 of the transmission shaft 7 through the locking nut 31, and one end of the pin shaft 11 passes through the second fixing hole 28 and is interference fit with the second fixing hole 28. The above connection method is simple and detachable, and disassembly and assembly are very convenient.

[0044] As attached Figure 1As shown, the bracket 1 is provided with a first probe seat 8, a second probe seat 17 and a camera seat 20, and the measuring module includes a first laser displacement sensor 18 installed on the first probe seat 8, a second laser displacement sensor 19 installed on the second probe seat 17 and an infrared thermal imager 21 installed on the camera seat 20. Since the maximum measuring range of the two laser displacement sensors is 8 mm, the first laser displacement sensor 18 is located above the highest position from the horizontal plane during the rotation of the crank 10 to measure the displacement curve of the crank 10, and the second laser displacement sensor 19 is located above the left limit of the horizontal displacement of the slide rail 16 to measure the displacement curve of the slide rail 16. The two laser displacement sensors are connected to the PC end, and the experimenter can use the corresponding software of the two laser displacement sensors to monitor and save the measured displacement curve and other information in real time through the laptop device brought by the experimenter, and can also use the sampling frequency of the two laser displacement sensors as a time node to prepare for further data processing later, such as converting the displacement curve into a velocity and acceleration curve, and multiple data angles to verify the type of rotating pair clearance fault.

[0045] The infrared thermal imager 21 is facing the slide bar 12 and the first bearing 13, and the linkage between the bearing on the pin shaft 11 of the present invention and the slide bar 12 is a non-closed environment, and the size of the gap affects the heat transfer caused by the collision and movement between the first bearing 13 and the slide bar 12. The experimenter can use the external infrared thermal imager 21 to take a thermal infrared image of the first bearing 13 and the slide bar 12, and the experimenter can use the known controlled rotational pair clearance of the first bearing 13 and the slide bar 12 as a label to perform machine learning, so as to achieve the purpose of combining machine vision with the fault diagnosis of the rotational pair clearance of rotating machinery.

[0046] As attached Figure 4 As shown, a third bearing 9 is installed on the first probe seat 8, and the transmission shaft 7 passes through the third bearing 9. The second bearing 6 and the third bearing 9 are fulcrums at both ends of the transmission shaft 7, which can make the rotation of the transmission shaft 7 more stable, and the rotation of the transmission shaft 7 on the bearing can greatly reduce friction loss, which has the advantage of being more energy-saving.

[0047] As attached Figure 5-7As shown, the first probe seat 8 is provided with a first strip hole 33 extending vertically, the first laser displacement sensor 18 is fixed on the first slide seat 32, the first slide seat 32 is penetrated with a first adjusting screw 34, and the bottom end of the first adjusting screw 34 is fixed to the first strip hole 33; the second probe seat 17 is provided with a second strip hole 44 extending vertically, the second laser displacement sensor 19 is fixed on the second slide seat 35, the second slide seat 35 is penetrated with a second adjusting screw 36, and the bottom end of the second adjusting screw 36 is fixed to the second strip hole 44; the camera seat 20 is provided with a third strip hole 40 extending vertically, the infrared thermal imager 21 is fixed on the slide plate 39, the slide plate 39 is penetrated with a third adjusting screw 41, and the bottom end of the third adjusting screw 41 is fixed to the third strip hole 40, the first laser displacement sensor 18, the first laser displacement sensor 18 and the infrared thermal imager 21 can be adjusted up and down by corresponding adjusting screws, so as to facilitate adjustment to the most suitable angle and accurately measure the experimental data.

[0048] As attached Figure 6 As shown, a fourth strip hole 37 is horizontally opened on the bracket 1, and a fourth adjusting screw 38 is passed through the second probe seat 17. The bottom end of the fourth adjusting screw 38 is fixed to the fourth strip hole 37. By adjusting the fourth adjusting screw 38, the installation position of the second probe seat 17 can be changed according to the left limit position of the slide rail 16, so that the second laser displacement sensor 19 on the second probe seat 17 is accurately installed above the left limit position of the slide rail 16, thereby accurately measuring the displacement curve of the slide rail 16.

[0049] The present invention is based on mechanical theory and combined with information collection technology. The rotating pair clearance fault simulation test bench of the rotating machinery is based on a sinusoidal mechanism composed of a crank 10, a pin 11, a slide bar 12, a slide rail 16 and a slider 15. The test bench can simulate the clearance effect of the rotating pair within a certain range. Since the experimental effect is not significant when the clearance is too large, the controllable clearance effect range is controlled between 0.05 and 1.00 mm. Under controllable clearance conditions, the displacement curves of the slide rail 16 and the crank 10 can be obtained by a laser displacement sensor, and the laser displacement sensor has its own implementation monitoring software. At a fixed sampling frequency, the experimenter can further process and analyze the displacement curves of the two without a timer. In order to be closer to intelligent manufacturing, the designed slide bar 12 part can provide the experimenter with red thermal imaging through an infrared thermal imager 21, and conduct machine vision experiments and further processing.

Claims

1. A test bench for simulating clearance fault of rotating pair of rotating machinery, characterized in that: The invention comprises a bracket (1), on which a power module, an experimental module and a measuring module are arranged; the experimental module comprises a crank (10), a pin shaft (11), a slide bar (12), a slide rail (16) and a slider (15); one end of the pin shaft (11) is fixed on the crank (10), the other end of the pin shaft (11) is slidably connected to the slide bar (12), the slide rail (16) is slidably arranged on the slider (15), and one end of the slide rail (16) is fixedly connected to the slide bar (12); the power module drives the crank (10) to rotate, the crank (10) drives the pin shaft (11) to rotate around the central axis of the crank (10), the pin shaft (11) slides on the slide bar (12), so that the slide rail (16) connected to the slide bar (12) moves along the slider (15); 15) moves in the length direction; the measuring module is used to measure the displacement state of the slide rail (16) and the crank (10); the slide bar (12) is in the shape of an elongated ring, and a slide hole (24) is provided on the slide bar (12); the end of the pin shaft (11) is installed with a first bearing (13), and the first bearing (13) is slidably arranged in the slide hole (24); a holder (25) is provided on the side of the slide bar (12), and a slot (26) is provided on the holder (25), one end of the slide rail (16) is embedded in the slot (26) and has an interference fit with the slot (26), and the end of the slide rail (16) is locked in the slot (26) by a locking screw (43); a slider mounting seat (14) is provided on the bracket (1), and the slider mounting seat (1 4) is provided with a slider installation groove (42), the slider (15) is embedded in the slider installation groove (42), and the slider (15) is fixed in the slider installation groove (42) by a locking screw (43); the power module comprises a speed regulating motor (3), a driving pulley (22), a driven pulley (23), a synchronous belt (4) and a transmission shaft (7), the speed regulating motor (3) is fixed to the bracket (1) by screws, the motor shaft of the speed regulating motor (3) is connected to the driving pulley (22), the bracket (1) is also provided with a bearing seat (5), a second bearing (6) is installed on the bearing seat (5), the transmission shaft (7) passes through the second bearing (6), one end of the transmission shaft (7) is connected to the crank (10), and the other end of the transmission shaft (7) is connected to the crank (10). The driven pulley (23) is connected to the driving pulley (22), and the synchronous belt (4) is wrapped around the driving pulley (22) and the driven pulley (23); the transmission shaft (7) is provided with a threaded portion (29) at one end close to the crank (10), and a limiting step (30) is provided at the inner end of the threaded portion (29); the crank (10) is provided with a first fixing hole (27) and a second fixing hole (28); the threaded portion (29) of the transmission shaft (7) passes through the first fixing hole (27), and a locking nut (31) is threadedly connected to the threaded portion (29); the crank (10) is pressed and fixed to the limiting step (30) of the transmission shaft (7) through the locking nut (31); one end of the pin shaft (11) passes through the second fixing hole (28) and is interference fit with the second fixing hole (28).

2. The test bench for simulating clearance fault of rotating pair of rotating machinery according to claim 1, characterized in that: The bracket (1) is provided with a first probe seat (8), a second probe seat (17) and a camera seat (20); the measuring module comprises a first laser displacement sensor (18) mounted on the first probe seat (8), a second laser displacement sensor (19) mounted on the second probe seat (17) and an infrared thermal imager (21) mounted on the camera seat (20); the first laser displacement sensor (18) is located above the highest position from the horizontal plane during the rotation of the crank (10); the second laser displacement sensor (19) is located above the left limit of the horizontal displacement of the slide rail (16); and the infrared thermal imager (21) is directly opposite to the slide bar (12) and the first bearing (13).

3. The test bench for simulating clearance fault of rotating pair of rotating machinery according to claim 2, characterized in that: A third bearing (9) is mounted on the first probe seat (8), and the transmission shaft (7) passes through the third bearing (9).

4. The test bench for simulating clearance fault of rotating pair of rotating machinery according to claim 2, characterized in that: The first probe seat (8) is provided with a first strip hole (33) extending in the vertical direction, the first laser displacement sensor (18) is connected to a first slide seat (32), a first adjusting screw (34) is passed through the first slide seat (32), and the bottom end of the first adjusting screw (34) is fixed to the first strip hole (33); the second probe seat (17) is provided with a second strip hole (44) extending in the vertical direction, the second laser displacement sensor (19) is connected to a second slide seat (35), a second adjusting screw (36) is passed through the second slide seat (35), and the bottom end of the second adjusting screw (36) is fixed to the second strip hole (44); the camera seat (20) is provided with a third strip hole (40) extending in the vertical direction, the infrared thermal imager (21) is connected to a slide plate (39), a third adjusting screw (41) is passed through the slide plate (39), and the bottom end of the third adjusting screw (41) is fixed to the third strip hole (40).

5. The test bench for simulating clearance fault of rotating pair of rotating machinery according to claim 2, characterized in that: A fourth strip hole (37) is horizontally opened on the upper edge of the bracket (1), a fourth adjusting screw (38) is passed through the second probe seat (17), and the bottom end of the fourth adjusting screw (38) is fixed to the fourth strip hole (37).

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