A bearing play detection device

Abstract

The application discloses a bearing clearance detection device and relates to the technical field of bearing detection, which comprises a supporting assembly and a limiting assembly. The supporting assembly comprises a moving piece two, and the moving piece two comprises a screw rod two and a clearance detector. The limiting assembly comprises a connecting rod, a gear ring, a mounting ring, a gas pump box, a gas bag and a positioning bag. The clearance detector is arranged on the lower side of the screw rod two, and the screw rod two is used for driving the clearance detector to move. The connecting rod is fixed at one end of the screw rod two. The connecting rod is externally fixed with the gear ring, the mounting ring is arranged outside the gear ring, the gas bag is annular, and the gas bag is fixed in the inner ring of the mounting ring. The gas bag in the limiting assembly can be inflated and expanded to drive the positioning bag into the gear groove of the gear ring. Then, the current variable fluid in the positioning bag is electrified to become hard, the screw rod two is locked, the position and angle of the clearance detector during the detection process are absolutely fixed, and the position deviation of the clearance detector caused by the inertia, residual torque or external misoperation of the motor two is avoided.

Description

Technical Field

[0001] This invention relates to the field of bearing testing technology, and in particular to a bearing clearance testing device. Background Technology

[0002] Bearings are core components in various rotating machinery, widely used in motors, automotive transmissions, machine tool spindles, wind power equipment, and other applications. Bearing clearance refers to the maximum permissible relative displacement between the rolling elements and the raceways of the inner and outer rings under no-load conditions. Its value directly determines the bearing's operational flexibility, temperature rise characteristics, vibration noise, and fatigue life. Excessive clearance can cause wobbling and abnormal noise, while insufficient clearance may lead to jamming, overheating, or even seizure. Therefore, rigorous clearance testing must be performed before bearings leave the factory or during assembly.

[0003] Currently, the commonly used clearance detection methods in the industry mainly include manual measurement with a handheld dial indicator or feeler gauge, relying on the operator to manually move the bearing race to read the difference, which is inefficient, has large human error, and poor repeatability; using special testing fixtures in conjunction with displacement sensors for measurement, although it is an improvement over manual methods, still has shortcomings in the bearing positioning process.

[0004] Most tooling uses parallel clamps or simple V-blocks to limit the outer ring of the bearing. When the bearing is placed in a slightly eccentric or tilted position, the axis of the raceway is prone to shift after clamping, which leads to misalignment between the clearance detector probe and the bearing raceway, introducing additional measurement errors.

[0005] The motor will generate inertial overshoot at the moment of starting and stopping. In addition, the residual torque of the lead screw can cause the clearance detector to slightly exceed the target position when it stops, resulting in deviation of the measurement angle or position, which in turn affects the accuracy of the detection results. Summary of the Invention

[0006] This application provides a bearing clearance detection device that solves the problems in existing technologies where most tooling uses parallel clamps or simple V-blocks to limit the bearing outer ring. When the bearing is slightly eccentric or tilted, the axis of the bearing raceway easily shifts after clamping, leading to misalignment between the clearance detector probe and the bearing raceway, introducing additional measurement errors. Furthermore, the inertial overshoot generated by the motor during start-up and shutdown, combined with the residual torque of the lead screw, can cause the clearance detector to slightly exceed the target position when stopped, resulting in deviations in the measurement angle or position, thus affecting the accuracy of the detection results. The device addresses these issues by inflating and expanding the air bladder in the limiting assembly, which then moves the positioning bladder into the gear ring. The toothed grooves, followed by the electrorheological fluid in the positioning chamber hardening upon energization, lock the lead screw, ensuring that the position and angle of the clearance detector are absolutely fixed during the detection process. This avoids positional deviation of the clearance detector caused by the inertia of the motor starting and stopping, residual torque, or external accidental contact, fundamentally eliminating measurement errors caused by angular or positional deviations and significantly improving the accuracy of clearance detection results. The V-shaped grooves have an automatic centering function, which can automatically correct and firmly fix even if the bearing is slightly misaligned during clamping. At the same time, multiple grooves allow multiple bearings to be tested to be clamped at one time, enabling continuous and automated detection of multiple bearings and significantly improving detection efficiency.

[0007] This application provides a bearing clearance detection device, including a support assembly and a limiting assembly. The support assembly includes a second movable component, which includes a second lead screw and a clearance detector. The limiting assembly includes a connecting rod, a toothed ring, a mounting ring, an air pump box, an air bladder, and a positioning bladder. The clearance detector is disposed on the lower side of the second lead screw, which is used to move the clearance detector. The connecting rod is fixed to one end of the second lead screw. The toothed ring is fixed outside the connecting rod, and the mounting ring is disposed outside the toothed ring. The air bladder is annular, and the air bladder is fixed inside the mounting ring. The air pump box is fixed outside the mounting ring. An air pump is disposed inside the air pump box, and the output end of the air pump in the air pump box is connected to the air bladder. The positioning bladder is fixed inside the air bladder, and the positioning bladder is filled with electrorheological fluid. The air bladder can expand together with the positioning bladder and enter the tooth groove of the toothed ring.

[0008] As an improvement, the connecting rod is cylindrical; the mounting ring is cylindrical with its axis running through it; the positioning bladder is annular; two electrode plates are installed inside the positioning bladder, and the electrode plates are in contact with the electrorheological fluid filling the positioning bladder, and the electrode plates are connected to an external power source; in the initial state, the axes of the connecting rod, mounting ring, air bladder and positioning bladder are on the same straight line; the two ends of the positioning bladder are respectively fixed to the inner ring of the mounting ring, and the positioning bladder completely covers the air bladder.

[0009] As an improvement, the support assembly includes a base, a sliding opening, uprights, a mounting bracket, an extension plate, a first abutment, a first movable component, and a second abutment. The base has a through-hole sliding opening. There are two uprights, symmetrically fixed to the lower side of the base. The mounting bracket is inverted U-shaped, with its lower end fixed to the upper side of the base, and the extension plate fixed to one side of the mounting bracket. The first and second abutments have identical structures. The first abutment includes a clamping plate and a groove. The clamping plate inside the first abutment slides on the upper side of the base, while the clamping plate inside the second abutment is fixed to the upper side of the base. Grooves, V-shaped, are formed on the sides of the two clamping plates in both the first and second abutments that are close to each other. The first movable component includes a first motor, a first lead screw, a first guide rod, a first slider, and a connecting block. The first motor is fixed to one side of the uprights. The two ends of the first lead screw rotatably mount on the sides of the two uprights that are close to each other, and the two ends of the first guide rod are fixed to the sides of the two uprights that are close to each other. The first slider is threadedly connected to the first lead screw. The upper part consists of two sliders: a slider 1 slidably mounted on a guide rod 1, a motor 1 whose output end is fixed to a rotating shaft rotatably connected to a lead screw 1 and a vertical plate; a clearance detector fixed to the lower side of slider 2; a motor 1 driving slider 1 to move on the lead screw 1; a guide rod 1 guiding and limiting the position of slider 1; a connecting block located inside the sliding opening, a connecting block fixed to slider 1, and an upper end of the connecting block fixed to the lower side of the inner clamping plate of the contact component 1; a moving component 2 also includes a motor 2, a guide rod 2, and slider 2; a motor 2 fixed to the side of the mounting frame away from the extension plate; two ends of the lead screw 2 rotatably mounted on both sides of the inner wall of the mounting frame; two ends of the guide rod 2 fixed on both sides of the inner wall of the mounting frame; slider 2 threadedly connected to the lead screw 2, slider 2 slidably mounted on the guide rod 2, and a motor 2 whose output end is fixed to a rotating shaft rotatably connected to the lead screw 2 and the mounting frame; a motor 2 driving slider 2 to move on the lead screw 2; and a guide rod 2 guiding and limiting the position of slider 2.

[0010] As an improvement, the length direction of lead screw one is parallel to the length direction of guide rod one; the length direction of lead screw two is parallel to the length direction of guide rod two; and the length direction of lead screw one is perpendicular to the length direction of lead screw two.

[0011] As an improvement, there are multiple grooves, which are evenly spaced along the length of the clamping plate.

[0012] As an improvement, the groove is used to limit the bearing to be tested; after the clamping plate and groove in the first and second contact parts have finished clamping the bearing to be tested, the bearing to be tested is located below the clearance detector.

[0013] As an improvement, the limiting assembly also includes a connecting plate 1, the upper end of which is fixed to the lower side of the extension plate, and the lower end of which is fixed to the outer ring of the mounting ring; the end of the lead screw 2 away from the motor 2 passes through the mounting bracket, and one end of the connecting rod is fixed to the end of the lead screw 2 away from the motor 2; the length direction of the connecting rod is on the same straight line as the length direction of the lead screw 2.

[0014] As an improvement, the limiting component also includes a separator membrane; there are multiple separator membranes, which are fixed inside the airbag and are fixed in a ring at uniform intervals inside the airbag; the multiple separator membranes divide the airbag cavity into multiple non-communicating expansion chambers in a ring; the number of air pumps in the air pump box is consistent with the number of non-communicating expansion chambers in the airbag separated by the multiple separator membranes, and they correspond one-to-one; the output end of the air pump in the air pump box is connected to the non-communicating expansion chambers in the airbag separated by the multiple separator membranes; the limiting component also includes a stop plate; the stop plate is located in the inner ring of the positioning bladder; in the initial state, the stop plate does not contact the inner ring of the positioning bladder; there are four stop plates, which are fixed in a ring on the outer ring of the toothed ring.

[0015] As an improvement, a display assembly is also included, comprising a positioning ring, an arc-shaped plate, a display film, a second connecting plate, an electromagnet, a telescopic device, a sliding block, a slide groove, a limiting rope, and a contact ball. There are two positioning rings, symmetrically fixed on both sides of the arc-shaped plate. Each positioning ring is a cylinder extending along its axis, and the axis of the positioning ring is on the same straight line as the axis of the mounting ring. The arc-shaped plate is a cylinder extending halfway along its axis. The contact ball is hemispherical, and the display film is made of rubber. Both ends of the display film are fixed to both ends of the arc-shaped plate, and both sides of the display film are fixed to the side of the two positioning rings that are close to each other. The arc-shaped plate and the display film form a cylinder extending along its axis. The display film is located on the side closest to the first motor. The upper end of the second connecting plate is fixed to the lower side of the extension plate, and the lower end of the second connecting plate is fixed to the outer ring of the positioning ring. A slide groove is opened on one side of the sliding block, through which the sliding block slides on the two positioning rings. The inner wall of the slide groove is arc-shaped and adapted to the positioning ring. The outer wall and the two positioning rings on opposite sides are completely fitted together; the sliding block slides on the positioning ring without contacting the connecting plate; a contact ball is fixed inside the groove; in the initial state, the contact ball protrudes outward against the display film; the telescopic device is fixed on one side of the sliding block, and an electromagnet is fixed on the side of the telescopic device away from the sliding block; the telescopic device is a spring telescopic rod; in the initial state, the electromagnet does not contact the connecting rod; both the telescopic device and the electromagnet are located in the inner ring of the positioning ring; the end of the electromagnet away from the telescopic device is arc-shaped and fits the outer wall of the connecting rod; the connecting rod is made of iron; there are four limiting ropes, one end of which is fixed to the sliding block, and the end of which is fixed to the inner ring of the positioning ring; there are two limiting ropes on the upper and lower sides of the sliding block, and two limiting ropes are fixed in the inner ring of a single positioning ring; the support assembly also includes an observation plate; the observation plate is fixed on the side of the extension plate away from the mounting frame; it also includes a monitoring camera; the monitoring camera is fixed on the side of the observation plate close to the mounting frame, and the output end of the monitoring camera faces the display film.

[0016] As an improvement, the limiting rope is made of elastic material; in the initial state, the contact ball is located at the center of the display film.

[0017] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0018] Firstly, by inflating the air bladder in the limiting component, the positioning bladder is driven into the tooth groove of the gear ring. Subsequently, the electrorheological fluid inside the positioning bladder is energized and hardens, locking the lead screw. This ensures that the position and angle of the clearance detector are absolutely fixed during the detection process, avoiding positional deviation of the clearance detector caused by the inertia of the motor starting and stopping, residual torque, or external accidental contact. This fundamentally eliminates measurement errors caused by angular or positional deviations, significantly improving the accuracy of clearance detection results. Secondly, the V-shaped groove has an automatic centering function. Even if the bearing is slightly misaligned, it can be automatically corrected and firmly fixed during clamping. At the same time, multiple grooves allow multiple bearings to be tested to be clamped at one time, enabling continuous and automated detection of multiple bearings, significantly improving detection efficiency.

[0019] Secondly, when the position of the clearance detector needs to be fine-tuned, instead of uniformly inflating and locking the entire airbag, air is selectively inflated into the independent expansion chamber closest to the target rotation direction. The local expansion pushes the corresponding contact plate, thereby causing the gear ring and lead screw two to rotate extremely slightly. This adds a flexible and controllable fine-tuning actuator to lead screw two, which can effectively overcome the inertial overshoot when the motor stops and accurately stop the clearance detector at the target position. By controlling the voltage of the electrorheological fluid in the positioning airbag, it is made to be in a semi-solid viscous state. During subsequent fine-tuning, it can absorb impact energy, making the start-up and stop process smooth and vibration-free, preventing damage to precision components or affecting positioning accuracy due to rigid impact.

[0020] Thirdly, when the electromagnet is energized and attracted to the connecting rod, the telescopic device is stretched, increasing the rotation radius of the sliding block and the contact ball. When the connecting rod rotates slightly, the contact ball will draw an arc on the display film. According to the arc length formula, with the rotation angle remaining constant, the larger the radius, the longer the arc length. This cleverly transforms and amplifies the minute angular displacement that is difficult to distinguish with the naked eye into a clearly visible linear displacement. The staff can directly observe the movement distance of the contact ball on the display film to intuitively judge the magnitude and direction of the fine adjustment, which greatly facilitates operation and monitoring. The design of the elastic limit rope ensures that the contact ball can move from the center in the corresponding direction regardless of whether the connecting rod rotates clockwise or counterclockwise, realizing the bidirectional rotation trajectory display. Attached Figure Description

[0021] Figure 1 This is a perspective view of a bearing clearance detection device according to the present invention;

[0022] Figure 2 This is a schematic diagram of the bearing clamping state of the first and second contact members of the bearing clearance detection device of the present invention;

[0023] Figure 3 This is a schematic diagram of the moving part two of the bearing clearance detection device of the present invention;

[0024] Figure 4 This is a schematic diagram of the moving component of a bearing clearance detection device according to the present invention. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the moving component of a bearing clearance detection device according to the present invention. Figure 2 ;

[0026] Figure 6 This is a schematic diagram of the installation of the limiting component of a bearing clearance detection device according to the present invention;

[0027] Figure 7 This is a schematic diagram of the airbag installation of a bearing clearance detection device according to the present invention;

[0028] Figure 8 This is a schematic diagram of the gear ring installation of a bearing clearance detection device according to the present invention;

[0029] Figure 9 This is a schematic diagram of the installation of the separator membrane in a bearing clearance detection device according to the present invention;

[0030] Figure 10 This is a perspective sectional view of the display component of a bearing clearance detection device according to the present invention;

[0031] Figure 11 This invention provides a three-dimensional display component for a bearing clearance detection device. Figure 1 ;

[0032] Figure 12 This invention provides a three-dimensional display component for a bearing clearance detection device. Figure 2 ;

[0033] Figure 13 This is a schematic diagram of the contact ball installation in a bearing clearance detection device according to the present invention;

[0034] Figure 14 This is a schematic diagram of the deformation state of the display film in a bearing clearance detection device according to the present invention.

[0035] In the diagram: 100, Support assembly; 110, Base; 111, Sliding port; 120, Vertical plate; 130, Mounting bracket; 140, Extension plate; 150, Observation plate; 160, Abutting component one; 161, Clamping plate; 162, Groove; 170, Moving component one; 171, Motor one; 172, Lead screw one; 173, Guide rod one; 174, Slider one; 175, Connecting block; 180, Moving component two; 181, Motor two; 182, Lead screw two; 183, Guide rod two; 184, Slider two; 185, Clearance detector; 19 0. Abutment component two; 200. Limiting component; 210. Connecting rod; 220. Toothed ring; 230. Mounting ring; 240. Air pump box; 250. Airbag; 260. Positioning bag; 270. Abutment plate; 280. Connecting plate one; 290. Separating membrane; 300. Display component; 310. Positioning ring; 320. Arc plate; 330. Display membrane; 340. Connecting plate two; 350. Electromagnet; 360. Telescopic device; 370. Sliding block; 371. Slide groove; 380. Limiting rope; 390. Abutment ball; 400. Monitoring camera. Detailed Implementation

[0036] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0037] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] Example 1: As Figures 1-8 As shown, this application discloses a bearing clearance detection device, which includes a support assembly 100 and a limiting assembly 200;

[0040] The support assembly 100 includes a base 110, a sliding port 111, a vertical plate 120, a mounting bracket 130, an extension plate 140, a first abutment 160, a first moving part 170, a second moving part 180, and a second abutment 190; the second moving part 180 includes a second motor 181, a second lead screw 182, a second guide rod 183, a second slider 184, and a clearance detector 185; the limiting assembly 200 includes a connecting rod 210, a toothed ring 220, a mounting ring 230, an air pump box 240, an airbag 250, a positioning bag 260, and a first connecting plate 280; the second lead screw 182 is provided with a clearance detector 185 on its lower side, and the second lead screw 182 is used to drive the clearance detector 185 to move;

[0041] Specifically, the clearance detector 185 is used to detect the radial and axial clearance of the bearing. The clearance detector 185 is moved by the rotation of the lead screw 182 to detect the clearance of the bearing to be tested.

[0042] The connecting rod 210 is cylindrical; the mounting ring 230 is cylindrical with its axis running through it; the positioning bladder 260 is annular; two electrode plates are provided inside the positioning bladder 260, and the electrode plates are in contact with the electrorheological fluid filling the positioning bladder 260, and the electrode plates are connected to an external power source.

[0043] Two electrode plates are spaced apart inside the positioning bladder 260. These two electrode plates are not simple flat plates, but rather coaxial annular electrodes. Specifically, both the first and second electrode plates are annular inner electrodes attached to the inner ring of the positioning bladder 260, located on opposite sides of the airbag 250. Thus, when the electrode plates are energized, a radial electric field uniformly distributed along the entire circumference is formed between the first and second electrode plates. This electric field covers all the electrorheological fluid filling the positioning bladder 260, ensuring uniform curing throughout the circumference within milliseconds after energization, thereby achieving maximum locking strength and optimal locking consistency. The electrorheological fluid consists of titanium oxide composite particles with a dielectric constant greater than 50 dispersed in insulating silicone oil. After applying an electric field, its rheological properties change significantly; it is liquid at zero electric field with a viscosity less than 0.2 Pa·s; and it rapidly cures within a millisecond (<10 ms) response time after applying an electric field. Under an electric field strength of 3-5 kV / mm, the shear yield strength after curing can reach 5 kPa-10 kPa; this is existing technology and will not be elaborated here.

[0044] In the initial state, the axes of the connecting rod 210, mounting ring 230, airbag 250, and positioning bladder 260 are on the same straight line. The connecting rod 210 is fixed to one end of the lead screw 182. A toothed ring 220 is fixed outside the connecting rod 210, and a mounting ring 230 is set outside the toothed ring 220. The airbag 250 is annular, and the airbag 250 is fixed inside the mounting ring 230. The air pump box 240 is fixed outside the mounting ring 230. An air pump is installed inside the air pump box 240, and the output end of the air pump in the air pump box 240 is connected to the airbag 250. The positioning bladder 260 is fixed inside the airbag 250 and is filled with electrorheological fluid. The two ends of the positioning bladder 260 are respectively fixed to the inner ring of the mounting ring 230, and the positioning bladder 260 completely encloses the airbag 250. The airbag 250 can cause the positioning bladder 260 to expand together and enter the tooth groove of the toothed ring 220.

[0045] Specifically, when it is necessary to fix the position of the lead screw 182, the air pump in the air pump box 240 inflates the air bag 250, causing the air bag 250 to expand inward. During the expansion process, the air bag 250 and the positioning bag 260 expand inward together, so that the air bag 250 and the positioning bag 260 enter the tooth groove of the tooth ring 220. Then, the electrorheological fluid in the positioning bag 260 is energized and hardened, thereby fixing the position of the entire lead screw 182.

[0046] The screw 182 cannot continue to rotate, thus ensuring the accuracy of the position and angle of the clearance detector 185 during the detection process. If the position and angle of the clearance detector 185 are inaccurate, it will lead to errors in clearance measurement. By ensuring the detection angle and position of the clearance detector 185, errors caused by angle or position deviations can be avoided, and external forces can be prevented from accidentally touching the detector and causing changes in the angle of the clearance detector 185, thereby further improving the accuracy of the measurement results.

[0047] A sliding opening 111 is provided through the base 110; there are two upright plates 120, which are symmetrically fixed to the lower side of the base 110; the mounting bracket 130 is inverted U-shaped, the lower end of the mounting bracket 130 is fixed to the upper side of the base 110, and the extension plate 140 is fixed to one side of the mounting bracket 130; the upper end of the connecting plate 280 is fixed to the lower side of the extension plate 140, and the lower end of the connecting plate 280 is fixed to the outer ring of the mounting ring 230.

[0048] Specifically, the limiting component 200 is installed on the outside of the mounting bracket 130, so the limiting component 200 will not interfere with the position adjustment of the clearance detector 185 inside the mounting bracket 130.

[0049] The first contact element 160 and the second contact element 190 have the same structure. The first contact element 160 includes a clamping plate 161 and a groove 162. The clamping plate 161 of the first contact element 160 is slidably disposed on the upper side of the base 110, and the clamping plate 161 of the second contact element 190 is fixed to the upper side of the base 110. A groove 162 is formed on the side of the two clamping plates 161 in the first contact element 160 and the second contact element 190 that is close to each other. The groove 162 is V-shaped. There are multiple grooves 162, which are evenly spaced along the length of the clamping plate 161. The groove 162 is used to limit the bearing to be tested. After the clamping plate 161 and the groove 162 in the first contact element 160 and the second contact element 190 have clamped the bearing to be tested, the bearing to be tested is located below the clearance detector 185.

[0050] Specifically, the position of the bearing to be tested is restricted by the first abutment 160 and the second abutment 190. The bearing to be tested is placed between the two clamps 161 inside the first abutment 160 and the second abutment 190, and needs to be located in the groove 162. The first abutment 160 moves towards the second abutment 190. During the movement, the position of the bearing to be tested is restricted by the groove 162.

[0051] Because the groove 162 is V-shaped, even if the bearing to be tested is misplaced in the groove 162, the bearing to be tested will be gradually returned to its original position and fixed as the first contact 160 and the second contact 190 gradually approach each other. In addition, multiple grooves 162 are provided, so multiple bearings can be positioned at one time, which improves the testing efficiency.

[0052] The moving component 170 includes a motor 171, a lead screw 172, a guide rod 173, a slider 174, and a connecting block 175. The motor 171 is fixed to one side of the upright plate 120. The two ends of the lead screw 172 are rotatably mounted on the side of the two upright plates 120 that are close to each other. The two ends of the guide rod 173 are fixed to the side of the two upright plates 120 that are close to each other. The slider 174 is threadedly connected to the lead screw 172 and slidably mounted on the guide rod 173. The motor 171 outputs power... The output end is fixed on the rotating shaft that is rotatably connected to the lead screw 172 and the vertical plate 120; the motor 171 is used to drive the slider 174 to move on the lead screw 172; the length direction of the lead screw 172 is parallel to the length direction of the guide rod 173; the guide rod 173 is used to guide and limit the position of the slider 174; the connecting block 175 is located inside the sliding port 111, and the connecting block 175 is fixed on the slider 174. The upper end of the connecting block 175 is fixed to the lower side of the inner clamping plate 161 of the contact member 160.

[0053] Specifically, the operation of motor 171 drives lead screw 172 to rotate. During the rotation, the position of slider 174 is restricted by guide rod 173, thereby adjusting the position of slider 174. Furthermore, since the contact member 160 is connected to slider 174 through connecting block 175, the position of contact member 160 is adjusted to perform clamping and positioning operations on the bearing to be tested.

[0054] Motor 181 is fixed to the side of mounting bracket 130 away from extension plate 140; both ends of lead screw 182 are rotatably mounted on both sides of the inner wall of mounting bracket 130; both ends of guide rod 183 are fixed to both sides of the inner wall of mounting bracket 130; the length direction of lead screw 182 is parallel to the length direction of guide rod 183; slider 184 is threadedly connected to lead screw 182 and slidably mounted on guide rod 183; the output end of motor 181 is fixed to the rotating shaft rotatably connected to lead screw 182 and mounting bracket 130; clearance detector 185 is fixed to the lower side of slider 184; motor 181 is used to drive slider 184 to move on lead screw 182; guide rod 183 is used to guide and limit the position of slider 184. The length direction of lead screw 172 is perpendicular to the length direction of lead screw 182. The end of the lead screw 182 away from the motor 181 passes through the mounting bracket 130, and one end of the connecting rod 210 is fixed to the end of the lead screw 182 away from the motor 181; the length direction of the connecting rod 210 is on the same straight line as the length direction of the lead screw 182.

[0055] Specifically, the operation of motor 181 drives lead screw 182 to rotate. During the rotation, the position of slider 184 is restricted by guide rod 183, thereby adjusting the position of slider 184. Clearance detector 185 is installed below slider 184, thereby adjusting the position of clearance detector 185 to perform individual detection operations on multiple objects to be detected that are clamped and fixed by contact member 160 and contact member 190.

[0056] The electrorheological fluid filling the gap detector 185 and the positioning capsule 260 is existing technology and will not be described in detail here.

[0057] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0058] The air bladder 250 in the limiting component 200 inflates, driving the positioning bladder 260 into the tooth groove of the toothed ring 220. Subsequently, the electrorheological fluid in the positioning bladder 260 is energized and hardens, locking the lead screw 182. This ensures that the position and angle of the clearance detector 185 are absolutely fixed during the detection process, avoiding positional deviation of the clearance detector 185 caused by the starting and stopping inertia of the motor 181, residual torque, or external accidental contact. This fundamentally eliminates measurement errors caused by angular or positional deviations, significantly improving the accuracy of clearance detection results. The V-shaped groove 162 has an automatic centering function. Even if the bearing is slightly misaligned, it can be automatically corrected and firmly fixed during clamping. At the same time, multiple grooves 162 allow multiple bearings to be tested to be clamped at one time, enabling continuous and automated detection of multiple bearings, significantly improving detection efficiency.

[0059] Example 2: In the above solution, the operation of motor 2 181 drives the clearance detector 185 to adjust its position. However, motor 2 181 experiences inertial overshoot at the moment of starting and stopping. Even when power is cut off, the internal rotor inertia and residual torque of lead screw 2 182 will still cause the clearance detector 185 to slightly exceed the target position when motor 2 181 stops. Based on this, the solution of Example 1 is improved, such as... Figure 9 As shown:

[0060] The limiting component 200 also includes a partition membrane 290; there are multiple partition membranes 290, which are fixed inside the airbag 250, and the multiple partition membranes 290 are fixed in a ring at uniform intervals inside the airbag 250; the multiple partition membranes 290 divide the cavity inside the airbag 250 into multiple non-communicating expansion chambers in a ring; the number of air pumps in the air pump box 240 is consistent with the number of non-communicating expansion chambers in the airbag 250 separated by the multiple partition membranes 290, and they correspond one-to-one; the output end of the air pump in the air pump box 240 is connected to the non-communicating expansion chambers in the airbag 250 separated by the multiple partition membranes 290; the limiting component 200 also includes an abutment plate 270; the abutment plate 270 is located in the inner ring of the positioning bladder 260; in the initial state, the abutment plate 270 does not contact the inner ring of the positioning bladder 260; there are four abutment plates 270, which are fixed in a ring on the outer ring of the toothed ring 220.

[0061] Specifically, the limit component 200 can drive the lead screw 182 to perform rotational fine-tuning operations; when it is necessary to rotate to one side, the expansion chamber of the airbag 250 separated by the separator 290 closest to the contact plate 270 is inflated, so that the inflated airbag 250 abuts against one side of the contact plate 270. During the continuous expansion process, the toothed ring 220 is driven to perform rotational fine-tuning operations.

[0062] Before rotational fine-tuning, the airbag 250 expands uniformly. During expansion, the positioning bag 260 adheres to the outside of the contact plate 270. By changing the voltage intensity of the electrorheological fluid, the hardness of the positioning bag 260 is controlled, making it a semi-solid liquid with greater damping. When fine-tuning the toothed ring 220, the positioning bag 260 can absorb impact energy like a damper and slowly initiate the fine-tuning operation. After the position adjustment is completed, the positioning bag 260 quickly hardens completely, locking the toothed ring 220.

[0063] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0064] When the position of the clearance detector 185 needs to be fine-tuned, instead of uniformly inflating and locking the entire airbag 250, air is selectively inflated into the independent expansion chamber closest to the target rotation direction. The local expansion pushes the corresponding abutment plate 270, thereby causing the gear ring 220 and the lead screw 182 to rotate extremely slightly. This adds a flexible and controllable fine-tuning actuator to the lead screw 182, which can effectively overcome the inertial overshoot when the motor stops and accurately stop the clearance detector 185 at the target position. By controlling the voltage of the electrorheological fluid in the positioning bladder 260, it is made to be in a semi-solidified viscous state. During subsequent fine-tuning, it can absorb impact energy, making the start-up and stop process smooth and vibration-free, preventing damage to precision components or affecting positioning accuracy due to rigid impact.

[0065] Example 3: In the above solution, the position of the clearance detector 185 is adjusted by the airbag 250 during use. However, when the device is finely adjusted, the arc length during rotation is small, making it inconvenient for operators to observe whether adjustments are being made. Furthermore, during normal use of the device, after the clearance detector 185 is positioned, it is impossible to visually detect any slight displacement of the clearance detector 185 during detection operations. Therefore, the solution in Example 2 is improved as follows: Figures 10-14 As shown:

[0066] It also includes a display assembly 300, which comprises a positioning ring 310, an arc-shaped plate 320, a display film 330, a connecting plate 340, an electromagnet 350, a telescopic device 360, a sliding block 370, a sliding groove 371, a limiting rope 380, and a contact ball 390. There are two positioning rings 310, symmetrically fixed on both sides of the arc-shaped plate 320. Each positioning ring 310 is a cylinder extending along its axis, and the axis of the positioning ring 310 is collinear with the axis of the mounting ring 230. The arc-shaped plate 320 is a cylinder extending halfway along its axis. The contact ball 390 is hemispherical. The display film 330 is made of rubber. Both ends of the display film 330 are fixed to both ends of the arc-shaped plate 320, and both sides of the display film 330 are fixed to the side of the two positioning rings 310 that are close to each other. The arc-shaped plate 320 and the display film 330 form a [missing information - likely a typo, should be "interconnected"]. The device is a cylindrical shape with its axis running through it; the display film 330 is located on the side closer to the motor 171; the upper end of the connecting plate 2 340 is fixed to the lower side of the extension plate 140, and the lower end of the connecting plate 2 340 is fixed to the outer ring of the positioning ring 310; a sliding groove 371 is opened on one side of the sliding block 370, and the sliding block 370 is slidably mounted on the two positioning rings 310 through the sliding groove 371; the inner wall of the sliding groove 371 is an arc shape adapted to the positioning ring 310, and the sliding groove 371 is completely fitted with the inner wall, outer wall and the side of the two positioning rings 310 that are far apart from each other; when the sliding block 370 slides on the positioning ring 310, it does not contact the connecting plate 2 340; a contact ball 390 is fixed in the sliding groove 371; in the initial state, the contact ball 390 protrudes outward against the display film 330; in the initial state, the contact ball 390 is located at the center of the display film 330.

[0067] Specifically, the display film 330 is located on the operating side near where the operator places the bearing to be tested, so that it can be easily observed when the contact ball 390 moves and deforms when it contacts the display film 330.

[0068] The telescopic device 360 ​​is fixed to one side of the sliding block 370, and the electromagnet 350 is fixed to the side of the telescopic device 360 ​​away from the sliding block 370; the telescopic device 360 ​​is a spring telescopic rod; in the initial state, the electromagnet 350 is not in contact with the connecting rod 210; both the telescopic device 360 ​​and the electromagnet 350 are located in the inner ring of the positioning ring 310; the end of the electromagnet 350 away from the telescopic device 360 ​​is arc-shaped and adapted to the outer wall of the connecting rod 210; the connecting rod 210 is made of iron.

[0069] Specifically, when the device is in normal use and the clearance detector 185 is performing clearance detection, the electromagnet 350 is energized and attracted to the connecting rod 210. If the lead screw 182 rotates, causing the clearance detector 185 to shift, the contact ball 390 will continuously move on the display film 330, making it convenient for staff to observe whether the clearance detector 185 has shifted.

[0070] Furthermore, when the position of the clearance detector 185 needs to be finely adjusted by the limiting component 200, the electromagnet 350 is energized and attracted to the connecting rod 210. When the connecting rod 210 rotates, the contact ball 390 moves continuously on the display film 330, which makes it convenient for staff to observe whether the clearance detector 185 has been adjusted and displaced.

[0071] After the electromagnet 350 is attracted to the connecting rod 210, the length of the telescopic device 360 ​​increases. The larger the radius, the longer the arc length corresponding to the same angle, which magnifies the tiny rotation into a linear displacement that is easier to observe. The tiny angular displacement that is difficult to distinguish with the naked eye is converted into a clearly visible change in arc length, which is convenient for the staff to observe.

[0072] The telescopic rod 360 is a spring telescopic rod. When the electromagnet 350 is not energized, the telescopic rod 360 is not stretched. The telescopic rod 360 is stretched only when the electromagnet 350 is energized.

[0073] There are four limiting ropes 380. One end of the limiting rope 380 is fixed to the sliding block 370, and the end of the limiting rope 380 away from the sliding block 370 is fixed to the inner ring of the positioning ring 310. There are two limiting ropes 380 on the upper and lower sides of the sliding block 370 respectively, and two limiting ropes 380 are fixed to the inner ring of a single positioning ring 310. The limiting ropes 380 are made of elastic material.

[0074] Specifically, by fixing the limiting ropes 380 to both the top and bottom of the sliding block 370, the position of the sliding block 370 is restricted, and the sliding block 370 is restricted to the center position of the display film 330. Whether the connecting rod 210 rotates counterclockwise or clockwise, the trajectory display operation can be completed on the display film 330.

[0075] After the electromagnet 350 is energized and attracted to the connecting rod 210, the electromagnet 350 rotates clockwise and counterclockwise by a maximum angle of forty degrees. After the rotation angle reaches forty degrees, the electromagnet 350 is de-energized. The electromagnet 350, the telescopic device 360 ​​and the sliding block 370, and the tension of the limiting rope 380 complete the reset, and the contact ball 390 returns to the center position. Then the electromagnet 350 can be energized again and attracted to the connecting rod 210 to perform the trajectory display operation again.

[0076] The support assembly 100 also includes an observation plate 150; the observation plate 150 is fixed to the side of the extension plate 140 away from the mounting bracket 130; it also includes a monitoring camera 400; the monitoring camera 400 is fixed to the side of the observation plate 150 near the mounting bracket 130, and the output end of the monitoring camera 400 faces the display film 330.

[0077] Specifically, the movement trajectory of the ball 390 can be continuously monitored by the monitoring camera 400.

[0078] The monitoring camera 400 and electromagnet 350 are both existing technologies and will not be described in detail here.

[0079] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0080] When the electromagnet 350 is energized and attracted to the connecting rod 210, the telescopic device 360 ​​is stretched, increasing the rotation radius of the sliding block 370 and the contact ball 390. When the connecting rod 210 rotates slightly, the contact ball 390 will draw an arc on the display film 330. According to the arc length formula, with the rotation angle unchanged, the larger the radius, the longer the arc length. This cleverly converts and amplifies the minute angular displacement that is difficult to distinguish with the naked eye into a clearly visible linear displacement. The operator can directly observe the movement distance of the contact ball 390 on the display film 330 to intuitively judge the magnitude and direction of the fine adjustment, which greatly facilitates operation and monitoring. The design of the elastic limit rope 380 ensures that the contact ball 390 can move from the center in the corresponding direction regardless of whether the connecting rod 210 rotates clockwise or counterclockwise, realizing the bidirectional rotation trajectory display.

[0081] The specific working process of the device is as follows:

[0082] Bearing placement: Place multiple deep groove ball bearings to be tested between the first contact 160 and the second contact 190 in sequence. Each bearing corresponds to a V-shaped groove 162. The V-shaped groove 162 has an automatic centering function. Even if the bearing is slightly off-center or tilted, it will be automatically corrected during the subsequent clamping process.

[0083] Start the moving part 170 to clamp the bearings: start the motor 171, which drives the lead screw 172 to rotate; the slider 174 moves along the lead screw 172 under the guidance of the guide rod 173, and drives the clamping plate 161 of the abutment part 160 to slide towards the abutment part 190 through the connecting block 175; the V-shaped grooves 162 on the two clamping plates 161 gradually close, clamping and centering multiple deep groove ball bearings at the same time; after clamping, all bearings are located directly below the clearance detector 185.

[0084] Start the moving part 180, and move the clearance detector 185 above the first bearing: start the motor 181, which drives the lead screw 182 to rotate; the slider 184 moves along the lead screw 182 under the guidance of the guide rod 183, and the clearance detector 185 moves accordingly, accurately aligning with the center position of the first deep groove ball bearing.

[0085] Locking screw 182 ensures the detection position is absolutely fixed: the air pump in the air pump box 240 inflates the air bag 250, the air bag 250 expands inward, driving the positioning bag 260 to expand together, so that the positioning bag 260 is embedded in the tooth groove of the toothed ring 220; the electrorheological fluid in the positioning bag 260 is energized, and solidifies and hardens in milliseconds, firmly locking the toothed ring 220, the connecting rod 210 and the screw 182; this completely eliminates the position displacement of the clearance detector 185 caused by the start-stop inertia of motor 181, residual torque or external accidental contact.

[0086] Clearance detector 185 performs measurements: Clearance detector 185 detects the radial and axial clearances of deep groove ball bearings; since lead screw 182 is locked, the probe position and angle remain absolutely stable during the detection process, and the measurement results are accurate and reliable.

[0087] For fine-tuning of the clearance detector 185 position: If a minor adjustment to the detection position is required, the overall airbag 250 is not uniformly expanded and locked; instead, the independent expansion chamber closest to the target rotation direction is individually inflated, and the local expansion pushes the corresponding contact plate 270, causing the toothed ring 220 and the lead screw 182 to rotate slightly; at the same time, the voltage of the electrorheological fluid inside the positioning bladder 260 is controlled to keep it in a semi-solidified viscous state, absorbing impact energy and achieving smooth, vibration-free fine-tuning; after the fine-tuning is in place, the positioning bladder 260 quickly and completely solidifies, and the lead screw 182 is relocked.

[0088] Angular displacement magnification display: When the electromagnet 350 is energized, it is attracted to the connecting rod 210, and the telescopic device 360 ​​is stretched, increasing the rotation radius of the sliding block 370 and the contact ball 390.

[0089] When the connecting rod 210 rotates slightly, the contact ball 390 draws an arc on the display film 330, magnifying the minute angular displacement that is difficult to distinguish with the naked eye into a clearly visible linear displacement. By observing the distance and direction of the movement of the contact ball 390 on the display film 330, the operator can intuitively judge the fine adjustment amount or determine whether the clearance detector 185 has been accidentally displaced.

[0090] Monitoring camera 400 assistance: The monitoring camera 400 continuously captures the trajectory of the contact ball 390 on the display film 330, which can be used for recording, remote monitoring or automatic alarm.

[0091] Move to the next bearing: After the current bearing inspection is completed, the positioning bladder 260 is de-energized and returns to a liquid state, the air bladder 250 is de-inflated, and the lock is released; the motor 181 is restarted again, and the clearance detector 185 is moved to the next bearing position, and the above positioning, locking and inspection steps are repeated.

[0092] After all tests are completed, the system is reset: Motor 171 rotates in the reverse direction, releasing the contact part 160, and all bearings that have completed the tests are removed; all components return to their initial state, awaiting the next batch of bearing tests.

[0093] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bearing clearance testing device, characterized in that, Includes a support component (100) and a limiting component (200); The support assembly (100) includes a second movable component (180), which includes a second lead screw (182) and a clearance detector (185). The limiting assembly (200) includes a connecting rod (210), a toothed ring (220), a mounting ring (230), an air pump box (240), an airbag (250), and a positioning bag (260); A clearance detector (185) is installed on the lower side of the lead screw (182), and the lead screw (182) is used to drive the clearance detector (185) to move; The connecting rod (210) is fixed to one end of the lead screw (182); The connecting rod (210) is fixed with a toothed ring (220), and an installation ring (230) is provided outside the toothed ring (220). The airbag (250) is annular, and the airbag (250) is fixed inside the installation ring (230). The air pump box (240) is fixed outside the installation ring (230). An air pump is installed inside the air pump box (240), and the output end of the air pump inside the air pump box (240) is connected to the air bag (250); The inner ring of the airbag (250) is fixed to the positioning bladder (260), and the positioning bladder (260) is filled with electrorheological fluid; The airbag (250) can inflate together with the positioning bag (260) and enter the tooth groove of the toothed ring (220).

2. The bearing clearance testing device according to claim 1, characterized in that, The connecting rod (210) is cylindrical; The mounting ring (230) is a cylindrical shape that runs through its axis; The positioning capsule (260) is ring-shaped; Two electrode plates are installed inside the positioning capsule (260). The electrode plates are in contact with the electrorheological fluid filling the positioning capsule (260). The electrode plates are connected to an external power source. In the initial state, the axes of the connecting rod (210), mounting ring (230), airbag (250), and positioning bag (260) are on the same straight line; The two ends of the positioning bladder (260) are fixed to the inner ring of the mounting ring (230), and the positioning bladder (260) completely encloses the airbag (250).

3. The bearing clearance testing device according to claim 2, characterized in that, The support assembly (100) includes a base (110), a sliding port (111), a vertical plate (120), a mounting bracket (130), an extension plate (140), a first abutment (160), a first movable part (170), and a second abutment (190). A sliding opening (111) is provided through the base (110). There are two upright plates (120), which are symmetrically fixed to the lower side of the base (110); The mounting bracket (130) is inverted U-shaped. The lower end of the mounting bracket (130) is fixed to the upper side of the base (110), and the extension plate (140) is fixed to one side of the mounting bracket (130). The first abutment (160) and the second abutment (190) have the same structure; The first contact element (160) includes a clamp (161) and a groove (162); The inner clamping plate (161) of the first contact part (160) is slidably disposed on the upper side of the base (110), and the inner clamping plate (161) of the second contact part (190) is fixed on the upper side of the base (110); The two clamps (161) inside the first abutment (160) and the second abutment (190) have a groove (162) on the side of the two clamps (161) that are close to each other. The groove (162) is V-shaped. The moving part (170) includes a motor (171), a lead screw (172), a guide rod (173), a slider (174), and a connecting block (175). Motor 1 (171) is fixed to one side of the upright plate (120); The two ends of the lead screw (172) are rotatably set on the side where the two upright plates (120) are close to each other, and the two ends of the guide rod (173) are fixed on the side where the two upright plates (120) are close to each other; The slider (174) is threadedly connected to the lead screw (172), the slider (174) is slidably set on the guide rod (173), and the output end of the motor (171) is fixed on the rotating shaft that is rotatably connected to the lead screw (172) and the vertical plate (120). Motor 1 (171) is used to drive slider 1 (174) to move on lead screw 1 (172); Guide rod one (173) is used to guide the position of limiting slider one (174); The connecting block (175) is located inside the sliding port (111), and the connecting block (175) is fixed on the slider (174). The upper end of the connecting block (175) is fixed to the lower side of the inner clamping plate (161) of the contacting member (160). The second moving part (180) also includes the second motor (181), the second guide rod (183), and the second slider (184). Motor 2 (181) is fixed to the side of the mounting bracket (130) away from the extension plate (140); The two ends of the lead screw (182) are rotatably set on both sides of the inner wall of the mounting bracket (130); the two ends of the guide rod (183) are fixed on both sides of the inner wall of the mounting bracket (130); The second slider (184) is threadedly connected to the second lead screw (182), the second slider (184) is slidably set on the second guide rod (183), and the output end of the second motor (181) is fixed on the rotating shaft that is rotatably connected to the second lead screw (182) and the mounting bracket (130); The gap detector (185) is fixed on the lower side of slider two (184); Motor 2 (181) is used to drive slider 2 (184) to move on lead screw 2 (182); Guide rod 2 (183) is used to guide the position of limiting slider 2 (184).

4. The bearing clearance testing device according to claim 3, characterized in that, The length direction of lead screw 1 (172) is parallel to the length direction of guide rod 1 (173); The length direction of lead screw 2 (182) is parallel to the length direction of guide rod 2 (183); The length direction of lead screw 1 (172) is perpendicular to the length direction of lead screw 2 (182).

5. The bearing clearance testing device according to claim 4, characterized in that, There are multiple grooves (162), which are evenly spaced along the length of the clamp (161).

6. The bearing clearance testing device according to claim 5, characterized in that, The groove (162) is used to limit the bearing to be inspected; After the clamping plate (161) and groove (162) in the first abutment (160) and the second abutment (190) clamp the bearing to be tested, the bearing to be tested is located below the clearance detector (185).

7. The bearing clearance testing device according to claim 6, characterized in that, The limiting assembly (200) also includes a connecting plate (280), the upper end of which is fixed to the lower side of the extension plate (140), and the lower end of which is fixed to the outer ring of the mounting ring (230); The end of the lead screw (182) away from the motor (181) is connected to the mounting bracket (130), and one end of the connecting rod (210) is fixed to the end of the lead screw (182) away from the motor (181); The length direction of the connecting rod (210) is on the same straight line as the length direction of the lead screw (182).

8. The bearing clearance testing device according to claim 7, characterized in that, The limiting component (200) also includes a separator (290); There are multiple separator membranes (290), which are fixed inside the airbag (250). The multiple separator membranes (290) are fixed in a ring-shaped and uniformly spaced manner inside the airbag (250). Multiple separators (290) annularly divide the cavity inside the airbag (250) into multiple non-interconnected expansion cavities; The number of air pumps in the air pump box (240) is consistent with the number of non-communicating expansion chambers in the air bladders (250) separated by multiple partition membranes (290), and they correspond one-to-one. The air pump output end inside the air pump box (240) is connected to the non-communicating expansion chambers inside the air bladders (250) separated by multiple separators (290); The limiting component (200) also includes an abutment plate (270); The contact plate (270) is located inside the positioning capsule (260); In the initial state, the contact plate (270) does not contact the inner ring of the positioning capsule (260); There are four contact plates (270), which are fixed in a ring on the outer ring of the toothed ring (220).

9. A bearing clearance testing device according to claim 8, characterized in that, It also includes a display assembly (300), which includes a positioning ring (310), an arc plate (320), a display film (330), a connecting plate (340), an electromagnet (350), a telescopic device (360), a sliding block (370), a slide groove (371), a limiting rope (380), and a contact ball (390). There are two positioning rings (310), which are symmetrically fixed on both sides of the arc-shaped plate (320); The positioning ring (310) is a cylindrical shape that runs through its axis, and the axis of the positioning ring (310) and the axis of the mounting ring (230) are on the same straight line. The curved plate (320) is a cylinder in which half of its axis runs through; The contact ball (390) is hemispherical, and the display film (330) is made of rubber. The two ends of the display film (330) are fixed to the two ends of the arc plate (320), and the two sides of the display film (330) are fixed to the side of the two positioning rings (310) that are close to each other; The curved plate (320) and the display film (330) form a cylindrical shape that runs through its axis; The display film (330) is located on the side closest to the motor (171); The upper end of the connecting plate 2 (340) is fixed to the lower side of the extension plate (140), and the lower end of the connecting plate 2 (340) is fixed to the outer ring of the positioning ring (310); A groove (371) is provided on one side of the sliding block (370), and the sliding block (370) is slidably mounted on the two positioning rings (310) through the groove (371); The inner wall of the slide groove (371) is an arc shape that fits the positioning ring (310). The inner wall, outer wall and the two positioning rings (310) are completely fitted together. When the sliding block (370) slides on the positioning ring (310), it does not contact the connecting plate (340); The sliding groove (371) is fixed with a contact ball (390); In the initial state, the contact ball (390) protrudes outward against the display film (330); The telescopic device (360) is fixed on one side of the sliding block (370), and the electromagnet (350) is fixed on the side of the telescopic device (360) away from the sliding block (370). The telescopic joint (360) is a spring telescopic rod; In the initial state, the electromagnet (350) is not in contact with the connecting rod (210); The telescopic device (360) and the electromagnet (350) are both located within the positioning ring (310); The end of the electromagnet (350) away from the telescoping device (360) is fitted with an arc shape on the outer wall of the connecting rod (210); The connecting rod (210) is made of iron; There are four limiting ropes (380). One end of the limiting rope (380) is fixed to the sliding block (370), and the other end of the limiting rope (380) away from the sliding block (370) is fixed to the inner ring of the positioning ring (310). The upper and lower sides of the sliding block (370) have two limiting ropes (380), and the inner ring of a single positioning ring (310) fixes the two limiting ropes (380). The support assembly (100) also includes an observation plate (150); The observation plate (150) is fixed to the side of the extension plate (140) away from the mounting bracket (130); It also includes monitoring cameras (400); The monitoring camera (400) is fixed on the side of the observation plate (150) near the mounting bracket (130), and the output end of the monitoring camera (400) faces the display film (330).

10. A bearing clearance testing device according to claim 9, characterized in that, The limiting rope (380) is made of elastic material; In the initial state, the contact ball (390) is located at the center of the display film (330).

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