Bearing rigidity testing device

Abstract

The invention relates to the technical field of bearing rigidity detection, and discloses a bearing rigidity testing device, which comprises a fixed seat sleeve, the driving part is used for providing rotation power for the to-be-tested bearing; a twisting assembly; the detection assembly is used for detecting the rigidity change of the bearing under the condition that the bearing bears constant pressure in multiple directions; and the driving piece is connected with the bearing through a twisting assembly. According to the bearing rigidity testing device, certain pressure can be applied to multi-directional positions of the bearing through the arranged detection assembly, large-range wrapping and pressing on the bearing can be achieved through the arrangement of the testing piece, meanwhile, pressing on the one-way position can also be achieved, and therefore the actual complex working condition of the bearing is simulated; and then the display device is used for marking and recording the deformation parameters of the bearing, so that the rigid change form of the bearing in a complex environment can be directly displayed, detection personnel can observe the rigid change form, and finally the accuracy of bearing detection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing stiffness detection, and specifically to a bearing stiffness testing device. Background Technique

[0002] A bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotational accuracy. Especially for the bearings on robotic devices, the movements of the robot basically rely on rotational movements for the actions of various components. Therefore, the bearings on the robot are very important components. However, during the operation of the robot, it is inevitable to have a certain degree of bumping. Once there is a bump, the bearing will be affected by indirect vibration and bumping. Therefore, the bearings on the robot have relatively high rigidity requirements and need to undergo a certain degree of stiffness detection before being used.

[0003] When a bearing of a certain model size is designed and the test piece is manufactured, the performance of the bearing will be detected, especially the rigidity. Because the rigidity of the bearing directly or indirectly determines the running stability between the bearing and the connecting parts, as well as the service life of the bearing. As an important component for the connection and rotation of the robot, the load of the bearing is in an uncertain or unfixed state. When the bearing is used in the field of robots, when the robot bumps at different speeds, different pressures will be generated on the connecting shaft, and then the pressure will be transmitted to the bearing. Therefore, the bearing needs to be tested under different loads or fluctuating loads to ensure its rigidity and running stability;

[0004] However, currently in the detection of bearings, basically a certain pressure is applied to the bearing through a testing machine to check the overall change in its rigidity. This detection method is too single and cannot effectively detect the rigidity of the bearing in a complex environment. Since the bearing is an important part and its service life is relatively long, relying solely on pressure extrusion, the test results are somewhat one-sided. Therefore, a bearing stiffness testing device is proposed to solve the above-mentioned problems. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a bearing stiffness testing device, which solves the problems in the prior art that the detection method for bearings is too single, unable to detect the change state of the bearing's running rigidity in a complex environment, and unable to intuitively display the test data.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solution: A bearing stiffness testing device, including a fixed seat sleeve; a driving member for providing rotational power for the bearing to be tested; a twisting assembly; a detecting assembly for detecting the change in bearing rigidity under constant pressure in multiple directions of the bearing; the driving member is connected to the bearing through the twisting assembly, and the detecting assembly is arranged on the fixed seat sleeve; the twisting assembly includes a connecting member, a locking member and a torque changing member; the detecting assembly includes a speed reducing member and a testing member.

[0009] Preferably, the connecting member includes a rotating shaft, one end of the rotating shaft is connected to the driving member, the other end of the rotating shaft is rotatably connected to a support sleeve, two rotating plates are rotatably connected inside the support sleeve, a power sleeve is fixedly connected to the side surface of the support sleeve, and the power sleeve is connected to the locking member.

[0010] Preferably, the locking member includes a mounting sleeve, the mounting sleeve is fixedly connected to the power sleeve, a plurality of opening grooves are formed on the surface of the mounting sleeve, the bearing is sleeved on the mounting sleeve, a locking cone is slidably connected inside the mounting sleeve, a threaded rod is fixedly connected to the left side of the locking cone, and the threaded rod is threadedly connected to the power sleeve.

[0011] Preferably, the torque changing member includes a circular tube, the circular tube is fixed inside the support sleeve through a plate body, an extrusion spring is arranged between the rotating plate and the plate body, the extrusion spring is sleeved on the circular tube, a sliding piece is slidably connected inside the rotating plate, the sliding piece is elastically connected to the rotating plate through a spring, a small roller is rotatably connected to the sliding piece, a marker pen is arranged on the small roller, the marker pen abuts against the speed reducing member, and an arc-shaped sleeve is fixedly connected to the surface of the support sleeve, and the small roller is slidably connected on the arc-shaped sleeve.

[0012] Preferably, the speed reducing member includes a driving gear, the driving gear is fixed on the power sleeve, a plurality of planetary gears are meshed on the surface of the driving gear, a fixed tooth sleeve is meshed on the surface of the planetary gear, the fixed tooth sleeve is connected to the fixed seat sleeve through a fixing member, a linkage sleeve is rotatably connected to the planetary gear, the linkage sleeve is connected to the testing member, and the linkage sleeve abuts against the marker pen.

[0013] Preferably, the testing member includes a roller, a connecting sleeve is fixedly connected to the roller, an arc-shaped extrusion groove is formed inside the linkage sleeve, the roller is slidably connected inside the arc-shaped extrusion groove, a guide post is slidably connected to the connecting sleeve, a pressure spring is sleeved on the guide post, one end of the pressure spring is connected to the connecting sleeve, and the other end of the pressure spring is connected to a pressing sleeve, and the pressing sleeve is fixedly connected to the guide post.

[0014] Preferably, four sets of test pieces are provided, and the four sets of test pieces are circularly arrayed with the center of the linkage sleeve as the axis of symmetry. A one-way groove is further formed inside the linkage sleeve, and a display device is provided on the test piece.

[0015] Preferably, the display device includes a sliding rod, a paintbrush is connected to the sliding rod, a marking board is installed on the fixed seat sleeve, the tip of the paintbrush abuts against the marking board, and scale lines are provided on the marking board.

[0016] Preferably, the elastic forces of the four sets of pressure springs are all different. The structure of the pressing sleeve is arc-shaped, and the guide post is slidably connected to the fixed seat sleeve.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a bearing stiffness testing device, which has the following beneficial effects:

[0019] 1. For this bearing stiffness testing device, the detection component can apply a certain pressure to multiple positions of the bearing in multiple directions, and the test piece can be used to achieve large-range wrapping pressure on the bearing, and can also achieve pressure on a single position, so as to simulate the actual complex working conditions of the bearing. Then, the deformation parameters of the bearing are marked and recorded by the display device, so that the rigid change form of the bearing in a complex environment can be directly imaged for the inspectors to observe, ultimately improving the accuracy of bearing detection.

[0020] 2. For this bearing stiffness testing device, through the provided torque change component, the torque transmitted by the driving component can be recorded, so as to determine whether there is extrusion deformation inside the bearing during the operation under load pressure, resulting in an increase in damping and an increase in torque, so as to detect the internal deformation of the bearing, further improving the detection accuracy of the bearing rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic front view of the overall structure of a bearing stiffness testing device proposed by the present invention;

[0022] Figure 2 It is a schematic rear view of the overall structure of a bearing stiffness testing device proposed by the present invention;

[0023] Figure 3 It is a schematic structural view of the twisting assembly of a bearing stiffness testing device proposed by the present invention;

[0024] Figure 4 It is a schematic structural view of the locking member of a bearing stiffness testing device proposed by the present invention;

[0025] Figure 5Schematic diagram of the speed reducer structure of a bearing stiffness testing device proposed by the present invention;

[0026] Figure 6 Schematic diagram of the partial structure of the test piece of a bearing stiffness testing device proposed by the present invention;

[0027] Figure 7 Schematic diagram of the connection structure between the test piece and the display device of a bearing stiffness testing device proposed by the present invention;

[0028] Figure 8 Schematic diagram of the structure of the linkage sleeve of a bearing stiffness testing device proposed by the present invention;

[0029] Figure 9 Schematic diagram of the connection structure between the linkage sleeve and the roller of a bearing stiffness testing device proposed by the present invention.

[0030] In the figure: 1. Fixed seat sleeve; 2. Detection component; 201. Driving gear; 202. Planetary gear; 203. Fixed gear sleeve; 204. Linkage sleeve; 205. Arc-shaped extrusion groove; 206. One-way groove; 207. Roller; 208. Connecting sleeve; 209. Guide post; 210. Pressure sleeve; 211. Pressure spring; 212. Sliding rod; 213. Paintbrush; 214. Marking board; 3. Twisting component; 301. Rotating shaft; 302. Support sleeve; 303. Power sleeve; 304. Slide piece; 305. Small roller; 306. Arc-shaped sleeve; 307. Rotating piece; 308. Round tube; 309. Extrusion spring; 310. Locking cone; 311. Threaded rod; 312. Mounting sleeve; 313. Open slot; Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-9 , a bearing stiffness testing device, including a fixed seat sleeve 1; a driving member for providing rotational power for the bearing to be tested; a twisting component 3; a detection component 2 for detecting the change in the rigidity of the bearing under constant pressure in multiple directions; the driving member is connected to the bearing through the twisting component 3, and the detection component 2 is arranged on the fixed seat sleeve 1; the twisting component 3 includes a connecting member, a locking member and a torsion change member; the detection component 2 includes a speed reducer and a test piece.

[0033] In this embodiment, the connecting member includes a rotating shaft 301. One end of the rotating shaft 301 is connected to the driving member, and the other end of the rotating shaft 301 is rotatably connected to a support sleeve 302. Two rotating plates 307 are rotatably connected inside the support sleeve 302. A power sleeve 303 is fixedly connected to the side surface of the support sleeve 302, and the power sleeve 303 is connected to the locking member. By providing the connecting member, the main purpose is to indirectly transmit the power of the driving member and provide a simulated operating environment for the bearing. Compared with the static detection of the traditional technical solution, the motion simulation of this method can improve the accuracy of the stiffness detection of the bearing more effectively.

[0034] Furthermore, the locking member includes a mounting sleeve 312. The mounting sleeve 312 is fixedly connected to the power sleeve 303. A plurality of opening grooves 313 are formed on the surface of the mounting sleeve 312. The bearing is sleeved on the mounting sleeve 312. A locking cone 310 is slidably connected inside the mounting sleeve 312. A threaded rod 311 is fixedly connected to the left side of the locking cone 310, and the threaded rod 311 is threadedly connected to the power sleeve 303. The bearing to be tested is sleeved on the mounting sleeve 312. By rotating the locking cone 310, the threaded rod 311 will be driven to rotate. Through the threaded connection method, the movement of the locking cone 310 and the threaded rod 311 into the interior of the power sleeve 303 will be controlled. Then, by using the conical surface of the locking cone 310 to squeeze and expand the mounting sleeve 312, the bearing can be locked and fixed. This fixing method can facilitate the quick disassembly and replacement of the bearing and improve the convenience of bearing installation during the detection process.

[0035] Furthermore, the torque variation component includes a circular tube 308. The circular tube 308 is fixed inside the support sleeve 302 through a plate body. An extrusion spring 309 is arranged between the rotating piece 307 and the plate body. The extrusion spring 309 is sleeved on the circular tube 308. A sliding piece 304 is slidably connected inside the rotating piece 307. The sliding piece 304 is elastically connected to the rotating piece 307 through a spring. A small roller 305 is rotatably connected to the sliding piece 304. A marker pen is arranged on the small roller 305. The marker pen abuts against the decelerating component. An arc-shaped sleeve 306 is fixedly connected to the surface of the support sleeve 302. The small roller 305 is slidably connected to the arc-shaped sleeve 306. The whole power is indirectly transmitted by the rotation of the rotating shaft 301. When the rotation of the inner ring of the bearing is subject to a certain resistance, at this time, the rotating piece 307 on the rotating shaft 301 squeezes the two extrusion springs 309, resulting in a certain degree of misalignment difference between the rotating shaft 301 and the support sleeve 302. Then the rotating piece 307 will drive the sliding piece 304 to rotate, and the small roller 305 connected to the sliding piece 304 will rotate synchronously. Under the rotating condition, while the small roller 305 slides on the arc-shaped sleeve 306, it drives the sliding piece 304 to be stretched, and the internal spring will be stretched. Then the sliding piece 304 moves up a small distance. Finally, the sliding piece 304 will drive the marker pen connected to it to move up. If the inside of the bearing is deformed and the rotation smoothness of the inner and outer rings of the bearing changes, and at this time the rotating shaft 301 has to overcome the resistance generated at this time and drive the marker pen to move up a small distance and then draw a circle. So at this time, the back of the linkage sleeve 204 will not always be a circular line. If the bearing is not deformed, the rotation smoothness of the inner and outer rings of the bearing basically does not change. So the relative position of the sliding piece 304 will not change and will always be at a certain height position. So the circular arc is in a single circular line. On the contrary, if the bearing is deformed, the rotation action of the rotating shaft 301 will apply different extrusion forces to the extrusion spring 309 through the rotating piece 307, and the relative position of the arc piece 304 will change to a certain extent. So it will be stretched, controlling the marker pen on the small roller 305 to move up. So when drawing a line later, it forms a diameter difference with the circular line under the initial normal operation, generating circular arcs with different diameters. When presenting multiple circular lines with different diameters, after the operator waits for the detection to be completed and checks the circular line on the back of the linkage sleeve 204, they can directly see the change in the smoothness between the inside and the outer ring of the bearing after being stressed, thereby providing a certain numerical reference for the rigidity detection of the bearing.

[0036] In addition, the speed reducer includes a driving gear 201 fixed on the power sleeve 303. A plurality of planetary gears 202 are meshed on the surface of the driving gear 201. A fixed gear sleeve 203 is meshed on the surface of the planetary gears 202. The fixed gear sleeve 203 is connected to the fixed seat sleeve 1 through a fixing member. A linkage sleeve 204 is rotatably connected to the planetary gears 202. The linkage sleeve 204 is connected to the test piece, and the linkage sleeve 204 abuts against a marker pen. Under the condition that the power sleeve 303 rotates, it will synchronously drive the high-speed rotation of the driving gear 201. The rotation of the driving gear 201 will drive the connection of the four planetary gears 202 meshed with it. Using the planetary rotation principle of the speed reducer, the linkage sleeve 204 is driven to rotate at a reduced speed. Because the operating rotation speed of the driving member is relatively fast, the principle of planetary reduction is used to reduce the rotation of the linkage sleeve 204 to avoid synchronous rotation. Because in the detection environment, it is necessary to keep the pressing process a gradual and slow process. Overall, the power of the rotating shaft 301 is used as the power source for bearing pressing, which is more convenient.

[0037] In addition, the test piece includes a roller 207. A connecting sleeve 208 is fixedly connected to the roller 207. An arc-shaped extrusion groove 205 is formed in the linkage sleeve 204. The roller 207 is slidably connected inside the arc-shaped extrusion groove 205. A guide post 209 is slidably connected to the connecting sleeve 208. A compression spring 211 is sleeved on the guide post 209. One end of the compression spring 211 is connected to the connecting sleeve 208, and the other end of the compression spring 211 is connected to a compression sleeve 210. The compression sleeve 210 is fixedly connected to the guide post 209. When the linkage sleeve 204 rotates, it will drive the roller 207 to slide up and down through the sliding connection between the internally provided arc-shaped extrusion groove 205 and the roller 207. Because the inner surface of the arc-shaped extrusion groove 205 is provided with an inclined surface and an arc surface, the sliding connection between the inclined surface and the roller 207 can be used to realize the up and down movement of the roller 207. The up and down movement of the roller 207 will drive the synchronous up and down sliding of the connecting sleeve 208. At this time, when the connecting sleeve 208 presses down, it will compress the compression spring 211, and then the compression spring 211 will provide pressure on the compression sleeve 210. Then the compression sleeve 210 will directly act on the bearing to simulate the bearing in a pressure-bearing state. Therefore, the surface deformation of the bearing is detected by using the pressure acting on the surface of the bearing, and the deformation detection directly corresponds to the stiffness detection of the bearing.

[0038] It should be noted that there are four sets of test pieces, and the four sets of test pieces are circularly arrayed with the center of the linkage sleeve 204 as the axis of symmetry. A one-way groove 206 is also provided inside the linkage sleeve 204, and a display device is provided on the test piece. The elastic forces of the four sets of pressure springs 211 are all different. The structure of the pressure sleeve 210 is arc-shaped, and the guide post 209 is slidably connected to the fixed seat sleeve 1. The tester can perform tests with different pressure loads according to the pressure springs 211 with different elastic forces. Of course, the operator can also set the pressure springs 211 with the same elastic force, and the specific setting is converted according to the test environment. The display device includes a sliding rod 212, a paintbrush 213 is connected to the sliding rod 212, a marking board 214 is installed on the fixed seat sleeve 1, the tip of the paintbrush 213 abuts against the marking board 214, and scale lines are provided on the marking board 214. A sliding rod 212 is provided on each connecting sleeve 208, so the synchronous sliding distance of the sliding rods 212 will become longer, and finally drive the paintbrush 213 to draw a long vertical line on the marking board 214. Because there are four paintbrushes 213, there will be four vertical lines on the marking board 214, and two of them will be longer than the other two lines. Therefore, at this time, the tester can determine the deformation degree and deformation position of the bearing according to the length of the vertical lines, so as to realize the detection of the bearing stiffness.

[0039] To sum up: By using the line-drawing type stiffness recording, it is possible to clearly detect the "points" where stiffness changes occur when the bearing is pressurized, and it is also possible to judge whether there is a stiffness change inside the bearing according to the power driving the bearing to rotate. Compared with the detection of traditional detectors, this technical solution can better reflect the multi-directional stiffness detection of the bearing. Because the existing technologies using sensors and detectors can only detect the changes in the external environment of the bearing, and the inner part, that is, the inner ring of the bearing, cannot be detected, or it is not easy to detect. However, with this technical solution, whether there is a stiffness change in the inner ring of the bearing can be judged through the change value of the driving force. The simplified principle direction is to control the dynamic rotation of the bearing through a shaft rod. The outer ring of the bearing is in a fixed state, and the inner ring is in a rotating state. When the stiffness of the inner ring changes, the rotation of the shaft rod will be subject to a certain degree of resistance, and the change value of the resistance generated by the rotation of the shaft rod is used to detect the stiffness change inside the bearing. This technical effect is more significant than the existing technologies, and the detection effect is better.

[0040] The entire technical solution belongs to the "dynamic measurement method" of bearings. Under the condition of power rotation of the bearings, a load force is applied to judge the stiffness change of the tested bearings. When the stiffness of the bearings changes, the stiffness change value of the bearings can be directly and clearly known by using the scribing method. Even if the stiffness change value of the bearings is small, the range of bearing stiffness change can be judged by the length of the scribing. Moreover, in the linkage process of this technical solution, "loads" in multiple directions and a unidirectional load are intermittently provided to the bearings to detect the local or overall stiffness change of the bearings. Its effect is more remarkable, and it can better simulate the actual complex working conditions of the bearings, making the subsequent detection values more accurate.

[0041] All the electrical components mentioned in this article are electrically connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device such as a computer for control.

[0042] Working principle: First, the bearing to be measured needs to be sleeved on the mounting sleeve 312. With the multiple opening slots 313 provided, a certain contraction space can be provided for the mounting sleeve 312, so that the bearing can be stably clamped on the mounting sleeve 312. Then, by rotating the locking cone 310, the threaded rod 311 will be driven to rotate. Through the threaded connection method, the locking cone 310 and the threaded rod 311 will be controlled to move into the interior of the power sleeve 303. Then, the conical surface of the locking cone 310 is used to squeeze and expand the mounting sleeve 312, and the bearing will be locked and fixed. This fixing method can facilitate the quick disassembly and replacement of the bearing. In the traditional method, the bearing and the shaft rod are tightly interference-connected to ensure the fixation of the bearing. However, the interference connection method is used in actual connections, while this technical solution is only for detection use. Therefore, it is necessary to ensure the quick installation and quick replacement of the bearing.When the bearing fixes the support shaft, by controlling the operation of the driving part, the rotation of the rotating shaft 301 will be driven. The rotating shaft 301 will drive the two rotating pieces 307 to rotate. The rotating piece 307 will drive the support sleeve 302 to rotate through the elastic connection of the two compression springs 309. Then, the rotation of the support sleeve 302 will drive the power sleeve 303 to rotate. When the power sleeve 303 rotates, it will drive the mounting sleeve 312 to rotate. At this time, the bearing on the mounting sleeve 312 will rotate accordingly, forming a state of simulated rotational operation. Under the condition of the rotation of the power sleeve 303, it will synchronously drive the high-speed rotation of the driving gear 201. The rotation of the driving gear 201 will drive the connection of the four planetary gears 202 meshing with it. Using the planetary rotation principle of the speed reducer, it drives the linkage sleeve 204 to rotate at a reduced speed. Because the running rotation speed of the driving part is relatively fast, the planetary reduction principle is used to reduce the rotation of the linkage sleeve 204 to avoid synchronous rotation. When the linkage sleeve 204 rotates, it will drive the roller 207 to slide up and down through the sliding connection between the arc-shaped extrusion groove 205 arranged inside and the roller 207. Because the inclined surface and the arc-shaped surface are arranged inside the arc-shaped extrusion groove 205, the up and down movement of the roller 207 can be realized by using the sliding connection between the inclined surface and the roller 207. The up and down movement of the roller 207 will drive the synchronous up and down sliding of the connection sleeve 208. When the connection sleeve 208 presses down at this time, it will compress the pressure spring 211. Then, the pressure is provided by the pressure spring 211 and acts on the pressure sleeve 210. Then, the pressure sleeve 210 will directly act on the bearing, thereby simulating the state of the bearing under pressure. Therefore, when the whole pressure is transmitted, it acts on the pressure spring 211 through the downward pressure of the connection sleeve 208. And the whole pressure sleeve 210 is provided with four groups, that is, there are four groups of pressure springs 211 and arc-shaped extrusion grooves 205. So at this time, the four groups of pressure sleeves 210 will rotate synchronously to simulate the pressure bearing of the bearing. The tester can perform tests with different pressure loads according to the pressure springs 211 with different elastic forces set. Of course, the operator can also set the pressure springs 211 with the same elastic force. The specific setting is converted according to the test environment. At this time, the bearing will bear pressures in multiple directions.Moreover, a one-way groove 206 is provided in the linkage sleeve 204 for the purpose of controlling a pressure sleeve 210 to bear pressure. Because when the roller 207 slides to the arc surface, it is in a pressure-relieving state at this time, and the pressure transmitted by the pressure sleeve 210 to the bearing gradually decreases. When a certain roller 207 moves to the position of the one-way groove 206, by using the sliding extrusion of the inclined surface again, a certain roller 207 will be individually controlled to press down, while the other three rollers 207 will still be in the other three arc surfaces, presenting a pressure-relieving state. Therefore, at this time, the extrusion sliding of a single roller 207 will be realized, so there will only be the pressure of one pressure sleeve 210 acting on the bearing, so as to simulate the extrusion stiffness test of the unilateral position. And the entire linkage sleeve 204 is in a rotating state. Therefore, as the rotation progresses, the other three rollers 207, that is, the pressure sleeve 210, will be gradually and sequentially controlled for individual extrusion, realizing the overall wrapped pressure bearing of the bearing and the unilateral pressure bearing. The entire linkage sleeve 204 rotates counterclockwise. If it rotates clockwise, the roller 207 will be stuck at the similar straight surface positions of the one-way groove 206 and the extrusion groove 205. However, if it rotates counterclockwise, the sliding surfaces of the one-way groove 206 and the extrusion groove 205 are inclined surfaces. Therefore, multiple rollers 207 will perform extrusion sliding at the inclined surface positions and will not be stuck. If a certain area of the bearing deforms, for example, when the bearing becomes an elliptical structure after bearing pressure, while the bearing itself is circular, but after deformation, it will be elliptical. Therefore, the downward extrusion displacement distance of two of the connecting sleeves 208 will be greater than the displacement distance of the other two connecting sleeves 208 at this time. And a sliding rod 212 is provided on each connecting sleeve 208. Therefore, the synchronous sliding distance of the sliding rods 212 will become longer, and finally drive the pen 213 to draw a long vertical line on the marking board 214. Because there are four pens 213, there will be four vertical lines on the marking board 214, and two of them will be longer than the other two lines. Therefore, at this time, the inspector can determine the deformation degree and deformation position of the bearing according to the length of the vertical lines, so as to realize the detection of the bearing stiffness. And the entire technical solution also provides a test structure for rigidly extruding the inside of the bearing, specifically a torque change part. The specific principle is that when the bearing deforms under pressure, there may also be a certain degree of deformation inside, which will cause a change in the rotation smoothness of the inner and outer rings of the bearing. Therefore, when the inner ring of the bearing rotates at this time, it will be subject to a certain damping, rather than the initial or constant value.The entire power transmission relies on the rotating shaft 301. When the rotation of the inner ring of the bearing encounters a certain resistance, the rotating piece 307 on the rotating shaft 301 squeezes the two compression springs 309, causing a certain degree of misalignment between the rotating shaft 301 and the support sleeve 302. Then, the rotating piece 307 drives the sliding piece 304 to rotate, and the small roller 305 connected to the sliding piece 304 rotates synchronously. Under the rotating condition, while the small roller 305 slides on the arc-shaped sleeve 306, it drives the sliding piece 304 to expand outward, and the internal spring will be stretched. Then, the sliding piece 304 moves up a small distance. Finally, the sliding piece 304 will drive the marker pen connected to it to move up. In the normal detection state, the marker pen is in contact with the back of the linkage sleeve 204. Therefore, as the marker pen rotates at a high speed, it will draw a circle on the back of the linkage sleeve 204. Although the linkage sleeve 204 is also rotating, the rotation speeds of the linkage sleeve 204 and the sliding piece 304 are different, that is, they are rotating at different speeds. So, a circular trajectory line will still be drawn on the linkage sleeve 204. If the inside of the bearing is deformed and the smoothness of the rotation of the inner and outer rings of the bearing changes, the rotating shaft 301 has to overcome the resistance generated at this time and drive the marker pen to move up a small distance, and then draw a circle. Therefore, at this time, the back of the linkage sleeve 204 will not always be a circular line, but will show circular lines with multiple different diameters. So, after the operator waits for the detection to be completed and checks the circular lines on the back of the linkage sleeve 204, they can directly see the change in the smoothness between the inside and the outer ring of the bearing after being subjected to pressure, thereby providing a certain numerical reference for the rigidity detection of the bearing.

[0043] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A bearing stiffness testing device, characterized in that: include: A fixed seat cover (1); A driving member, used to provide rotational power to the bearing to be tested; Twisting assembly (3); A detection component (2) is used to detect changes in bearing rigidity when the bearing is subjected to constant pressure in multiple directions; The driving member is connected to the bearing via a torsion assembly (3), and the detection assembly (2) is arranged on the fixed seat sleeve (1); The torsion assembly (3) comprises a connecting member, a locking member and a torque changing member; The detection component (2) comprises a speed reducing component and a testing component; The speed reducer comprises a driving gear (201), the driving gear (201) is fixed on a power sleeve (303), a plurality of planetary gears (202) are meshed on the surface of the driving gear (201), a fixed gear sleeve (203) is meshed on the surface of the planetary gear (202), the fixed gear sleeve (203) is connected to a fixed seat sleeve (1) via a fixing member, a linkage sleeve (204) is rotatably connected to the planetary gear (202), and the linkage sleeve (204) is connected to a test piece; The test piece comprises a roller (207), a connecting sleeve (208) is fixedly connected to the roller (207), an arc-shaped extrusion groove (205) is provided in the linkage sleeve (204), the roller (207) is slidably connected inside the arc-shaped extrusion groove (205), a guide column (209) is slidably connected to the connecting sleeve (208), a pressure spring (211) is sleeved on the guide column (209), one end of the pressure spring (211) is connected to the connecting sleeve (208), the other end of the pressure spring (211) is connected to a pressing sleeve (210), and the pressing sleeve (210) is fixedly connected to the guide column (209).

2. A bearing stiffness testing device according to claim 1, characterized in that: The connecting member comprises a rotating shaft (301), one end of the rotating shaft (301) is connected to the driving member, the other end of the rotating shaft (301) is rotatably connected to a supporting sleeve (302), the interior of the supporting sleeve (302) is rotatably connected to two rotating plates (307), the side of the supporting sleeve (302) is fixedly connected to a power sleeve (303), and the power sleeve (303) is connected to a locking member.

3. A bearing stiffness testing device according to claim 2, characterized in that: The locking member comprises a mounting sleeve (312), the mounting sleeve (312) is fixedly connected to the power sleeve (303), a plurality of opening grooves (313) are provided on the surface of the mounting sleeve (312), a bearing sleeve is arranged on the mounting sleeve (312), a locking cone (310) is slidably connected inside the mounting sleeve (312), a threaded rod (311) is fixedly connected to the left side of the locking cone (310), and the threaded rod (311) is threadedly connected to the power sleeve (303).

4. A bearing stiffness testing device according to claim 3, characterized in that: The torque changing member comprises a round tube (308), the round tube (308) is fixed inside the support sleeve (302) through a plate body, an extrusion spring (309) is arranged between the rotating plate (307) and the plate body, the extrusion spring (309) is sleeved on the round tube (308), a sliding plate (304) is slidably connected inside the rotating plate (307), the sliding plate (304) is elastically connected to the rotating plate (307) through a spring, a small roller (305) is rotatably connected to the sliding plate (304), a marking pen is arranged on the small roller (305), the linkage sleeve (204) abuts against the marking pen, an arc sleeve (306) is fixedly connected to the surface of the support sleeve (302), and the small roller (305) is slidably connected to the arc sleeve (306).

5. A bearing stiffness testing device according to claim 1, characterized in that: The test pieces are arranged in four groups, and the four groups of test pieces are distributed in a circular array with the center of the linkage sleeve (204) as the symmetry axis. A one-way groove (206) is also provided inside the linkage sleeve (204), and a display device is provided on the test pieces.

6. A bearing stiffness testing device according to claim 5, characterized in that: The display device comprises a sliding rod (212), a paintbrush (213) is connected to the sliding rod (212), a marking plate (214) is installed on the fixed seat cover (1), the tip of the paintbrush (213) is in contact with the marking plate (214), and scale lines are arranged on the marking plate (214).

7. A bearing stiffness testing device according to claim 6, characterized in that: The elastic forces of the four groups of pressure springs (211) are all different. The structure of the pressure sleeve (210) is in an arc shape. The guide column (209) is slidably connected to the fixed seat sleeve (1).

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