Service life simulation experiment device for miniature high-precision bearing

Abstract

The invention relates to the field of miniature high-precision bearings. The invention discloses a miniature high-precision bearing service life simulation experiment device which comprises a C-shaped experiment table, a motor fixedly arranged on the front side of a supporting plate, and a support plate fixedly arranged on the top of a transverse plate of the C-shaped experiment table. A rotating shaft of the motor penetrates through the front side of the supporting plate and is rotationally provided with a fixing mechanism used for limiting the bearing, and an L-shaped groove is formed in the middle of the front side of the supporting plate. A to-be-tested bearing sleeves the side surfaces of four T-shaped plates, and a threaded rotating rod is rotated to drive a circular sleeve and a connecting block to move backwards, so that the four T-shaped plates can be opened outwards at the same time, and an inner ring of the to-be-tested bearing is supported; the threaded rotating rod drives the round sleeve and the connecting block to rotate to different areas, so that the T-shaped plate can be opened to different sizes, and then bearings with different inner diameters can be rapidly supported.

Description

Technical Field

[0001] The present invention relates to the field of micro high-precision bearings, in particular to a life simulation experimental device for micro high-precision bearings. Background Art

[0002] The micro high-precision bearing life simulation experimental device is a precision testing device used to evaluate the durability and reliability of bearings under complex operating conditions. By simulating the dynamic loads, speeds, temperatures, and lubrication conditions of actual operating environments, combined with precision mechanical structures and high-precision sensing systems, it monitors changes in key bearing parameters such as vibration, friction, and temperature rise in real time. The device adopts a modular design, allowing for flexible control of loading and drive modes. Equipped with a multi-dimensional data acquisition and analysis system, it can replicate failure mechanisms such as wear and fatigue in long-term bearing operation in a laboratory environment, providing a scientific basis for optimizing material selection, structural design, and lubrication solutions. It is widely used in the research and development and quality control of high-end bearings in fields such as aerospace, precision instruments, and micro-electromechanical systems.

[0003] In existing bearing life simulation test technology, the conventional method is to perform an interference fit between the inner ring of the bearing and a fixed mold of a specific size and drive the outer ring to rotate to simulate the dynamic load under actual working conditions. However, this method faces significant technical limitations in practical applications. Due to the significant differences in the inner ring apertures of different types of bearings, the test equipment must be equipped with adapter molds of various specifications. Whenever the test sample is changed, a series of operations such as mold disassembly, replacement and recalibration are required. This frequent mold replacement not only increases the test preparation time, but also causes the test equipment to be unable to operate normally during the replacement, thereby reducing the overall test efficiency and equipment utilization rate. Summary of the Invention

[0004] The purpose of the present invention is to provide a life simulation test device for micro high-precision bearings, so as to solve the problem raised in the above background technology that due to the significant differences in the inner ring apertures of bearings of different models, the test equipment must be equipped with adapter molds of various specifications. Whenever the test sample is replaced, a series of operations such as mold disassembly, replacement and recalibration are required. This frequent mold replacement not only increases the test preparation time, but also causes the test equipment to be unable to operate normally during the replacement, thereby reducing the overall test efficiency and equipment utilization rate. In order to achieve the above purpose, the present invention provides the following technical solutions: A life simulation test device for micro high-precision bearings, comprising a C-shaped test table, wherein a support plate is fixedly provided on the top of the horizontal plate of the C-shaped test table; It also includes a motor, which is fixedly arranged on the front side of the support plate, and the rotating shaft of the motor passes through the front side of the support plate and is rotatably provided with a fixing mechanism for limiting the bearing; An L-shaped groove is provided in the middle of the front side of the support plate, an L-shaped block is slidably provided inside the L-shaped groove, a compression spring is fixedly provided on the top of the horizontal block of the L-shaped block, the top of the compression spring is fixedly connected to the top of the inner wall of the L-shaped groove, an adjustment mechanism is fixedly provided on the top of the L-shaped block, a movable groove is provided on the left side of the front side of the support plate, and a movable block is slidably provided inside the movable groove.

[0005] Preferably, the fixing mechanism comprises an internally threaded sleeve, the rear end of which is fixedly connected to the front end of the motor rotating shaft; The front side of the internally threaded sleeve is rotatably provided with a threaded rotating rod, the side of the threaded rotating rod is rotatably provided with a round sleeve, the side of the round sleeve is fixedly provided with four connecting blocks, the front side of the internally threaded sleeve is fixedly sleeved with a gear, and the rigid connection between the internally threaded sleeve and the motor shaft ensures the stability and accuracy of power transmission. The rotational matching design of the threaded rotating rod and the round sleeve realizes the precise control of axial displacement; the symmetrical arrangement of the four connecting blocks ensures uniform force, and the setting of the gears provides a reliable transmission interface for the subsequent adjustment mechanism. The overall structure is compact and the transmission efficiency is high.

[0006] Preferably, a cross bar is fixedly sleeved on the side of the internal threaded sleeve rod, and T-shaped grooves are provided on the left and right sides of the front side of the horizontal bar of the cross bar and the upper and lower sides of the front side of the vertical bar of the cross bar; The T-slot is provided with a T-shaped plate for sliding inside the T-slot, and the side surface of the horizontal plate of the T-plate slides with the inside of the T-slot. The four T-plates are a group of two, and the side surfaces of the horizontal blocks on the opposite sides are all arc surfaces, and the arc surfaces of the horizontal blocks of the T-plate are fixedly provided with rubber strips. Two connecting plates are rotatably provided on the front and rear sides of the vertical plates of the T-plate, and the interior of the connecting plate rotates with the side surfaces of the connecting block. The cross-bar structure not only enhances the overall rigidity, but its symmetrically distributed T-slots provide a precise guide track for the T-plate, and the sliding cooperation between the T-plate and the T-slot ensures the smoothness of radial movement. The arc surface design cooperates with the rubber strip to ensure full contact with the inner ring of the bearing and avoids surface damage. The rotating setting of the connecting plate realizes the conversion of the motion form, so that the axial displacement can be effectively converted into radial clamping force. The Shore hardness of the rubber strip has been optimized and selected, which will not scratch the bearing surface while providing sufficient friction.

[0007] Preferably, the adjustment mechanism includes an L-shaped rod, which is fixedly arranged on the top of the vertical block of the L-shaped block, and an L-shaped strip is fixedly arranged on the left side of the front side of the horizontal bar of the L-shaped rod, and the left and right sides of the bottom of the vertical bar of the L-shaped strip and the left and right sides of the bottom of the vertical bar of the L-shaped rod are beveled, and the lower side of the vertical bar of the L-shaped rod contacts the side of the gear. The linkage design of the L-shaped rod and the L-shaped strip realizes convenient operation, and the beveled angle treatment makes the meshing process smoother, effectively reduces impact and wear, and the contact design with the side of the gear not only ensures the reliability of the transmission, but also facilitates quick unlocking, which significantly improves the adjustment efficiency.

[0008] Preferably, the shape of the moving block and the shape of the inside of the moving groove are both L-shaped, and a rack is fixedly provided on the top of the moving block, and the side surface of the rack slides with the lower side of the vertical rod of the L-shaped rod and the side surface of the rack, and a circular shaft is rotatably provided on the front side of the moving block, and the side surface of the circular shaft and the side surface of the four T-shaped plates are sleeved with belts. The L-shaped matching structure ensures the precise guidance of the moving block in the moving groove, and the sliding matching of the rack and the L-shaped rod realizes the adjustability of the position; the rotation setting of the circular shaft ensures the flexibility of the belt drive, and the overall design makes the belt tension adjustment more precise and convenient.

[0009] Preferably, a reinforcing diagonal rod is fixedly provided on the side of the horizontal rod of the L-shaped rod, and the side of the reinforcing diagonal rod is fixedly matched with the side of the horizontal bar of the L-shaped bar. The setting of the reinforcing diagonal rod significantly improves the bending stiffness and stability of the L-shaped rod structure, effectively prevents deformation under stress, and ensures positioning accuracy and reliability in long-term use. The reinforcing diagonal rod adopts the triangular stabilization principle, and its welding position is optimized by finite element analysis. The reinforcing ribs added inside make the stress distribution more uniform, avoiding the risk of microcrack expansion caused by local stress concentration.

[0010] Preferably, a placement groove is provided on the top of the horizontal plate of the C-shaped laboratory table, a sealing baffle is slidingly provided inside the placement groove, and a handle is fixedly provided on the top of the sealing baffle, and the interior of the placement groove is filled with lubricating silicone grease. The placement groove provides a special workstation for bearing testing, and the sliding sealing baffle design is convenient for operation and can effectively isolate external pollution. The filling of lubricating silicone grease not only reduces friction loss, but also forms an anti-oxidation protective layer, thereby extending the service life of the bearing. The lubricating silicone grease is formulated with fully synthetic base oil and has excellent high-temperature stability and metal surface affinity.

[0011] Preferably, the bottom of the two vertical plates of the C-shaped laboratory table are fixed with reinforcement plates, one side of the reinforcement plates is fixedly matched with the bottom of the horizontal plate of the C-shaped laboratory table, and the left and right sides of the two vertical plates of the C-shaped laboratory table are fixed with fixed blocks. The combined design of the reinforcement plates and the fixed blocks forms a stable support frame, which effectively disperses the load stress, suppresses vibration deformation, and provides a solid structural guarantee for high-speed testing conditions.

[0012] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the bearing to be tested is placed on the side surfaces of four T-shaped plates, and the threaded rotating rod is rotated to drive the circular sleeve and the connecting block to move backward, so that the four T-shaped plates can be opened outward at the same time and support the inner ring of the bearing to be tested. This radial synchronous expansion mechanism adopts precision trapezoidal thread transmission to ensure that the four T-shaped plates always maintain synchronous movement, avoiding deformation of the inner ring of the bearing due to uneven force. When supporting bearings with different inner diameters, the T-shaped plates can be opened to different sizes by driving the circular sleeve and the connecting block to rotate to different areas with the threaded rotating rod. The pitch of the threaded rotating rod has been optimized, and each rotation corresponds to an accurate radial displacement. It can be quickly positioned to the standard bearing inner diameter size position with the scale indicator ring. This design can not only quickly support and fix bearings with different inner diameters, but also compensate for the tolerance of the bearing inner ring through the elastic deformation of the rubber strip, ensuring uniform distribution of clamping force.

[0013] In the present invention, the L-shaped block drives the L-shaped rod to move upward, compresses the compression spring, releases the engagement state between the L-shaped block and the rack, moves the moving block and the circular shaft to a suitable position, and ensures that the tension of the belt is in a suitable state, relaxes the L-shaped block, and allows the L-shaped block to reset downward by the rebound force of the compression spring, thereby ensuring that the belt is in a suitable tension. Then, the rotating shaft of the motor drives the internal threaded sleeve rod, the T-shaped plate and the bearings on its side to rotate, so that the belt in a taut state drives the inner ring of the bearing to rotate for testing.

[0014] The L-shaped block is used to move the L-shaped rod upward, and the L-shaped bar is also used to move upward, so that the vertical bar of the L-shaped bar is released from the fixed state of the gear. This linkage mechanism adopts integrated processing to ensure the synchronization and reliability of the action. When the bearings of different inner diameters are fixed by rotating the threaded rotating rod, the optimized design of the gear tooth shape makes the meshing process smoother and reduces the impact vibration during adjustment. When the threaded rotating rod is rotated to the appropriate area, it moves downward through the vertical bar of the L-shaped bar, and the bevel angle design at its bottom can automatically guide the meshing with the gear tooth groove to ensure positioning accuracy. This design can not only reliably engage the side of the gear teeth, but also prevent accidental loosening during the test through the ratchet principle. For bearings with large or small differences in inner diameter, this mechanism can achieve rapid fixation, and its adjustment range covers standard bearing sizes from miniature to large. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of a partial three-dimensional structure of a C-shaped laboratory table of the present invention; Figure 3This is a three-dimensional structural expansion diagram of the support plate of the present invention; Figure 4 It is a partial three-dimensional structure expansion diagram of the support plate of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the moving block of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the fixing mechanism of the present invention; Figure 7 Schematic diagram of the three-dimensional structure of the cross bar of the present invention; Figure 8 It is a partial three-dimensional structure expansion diagram of the fixing mechanism of the present invention; Figure 9 It is a partial three-dimensional structural schematic diagram of the fixing mechanism of the present invention; Figure 10 It is a schematic diagram of a partial three-dimensional structure of the adjustment mechanism of the present invention.

[0016] In the figure: 1. C-shaped laboratory table; 101. Placement slot; 102. Sealing baffle; 103. Pull handle; 104. Reinforcement; 105. Fixed block; 2. Support plate; 3. Motor; 4. Fixing mechanism; 401. Internal threaded sleeve; 402. Threaded rotating rod; 403. Round sleeve; 404. Connecting block; 405. Cross bar; 406. T-shaped slot; 407. T-shaped plate; 408. Rubber strip; 409. Connecting plate; 4010. Gear; 5. L-shaped slot; 6. L-shaped block; 7. Adjustment mechanism; 701. L-shaped rod; 702. L-shaped bar; 8. Moving slot; 9. Moving block; 901. Rack; 902. Round shaft; 903. Belt; 10. Compression spring. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] See also Figures 1 to 10 The present invention provides a technical solution: a life simulation experimental device for micro high-precision bearings, comprising a C-shaped experimental table 1, a support plate 2 is fixedly provided on the top of the horizontal plate of the C-shaped experimental table 1; It also includes a motor 3, which is fixedly arranged on the front side of the support plate 2. The rotating shaft of the motor 3 passes through the front side of the support plate 2 and is rotatably provided with a fixing mechanism 4 for limiting the bearing; An L-shaped groove 5 is provided in the middle of the front side of the support plate 2, and an L-shaped block 6 is slidingly provided inside the L-shaped groove 5. A compression spring 10 is fixedly provided on the top of the horizontal block of the L-shaped block 6, and the top of the compression spring 10 is fixedly connected to the top of the inner wall of the L-shaped groove 5. An adjustment mechanism 7 is fixedly provided on the top of the L-shaped block 6. A movable groove 8 is provided on the left side of the front side of the support plate 2, and a movable block 9 is slidingly provided inside the movable groove 8.

[0019] Example 1: See also Figure 5 、 Figure 6 、 Figure 7 , this embodiment provides a technical solution: The fixing mechanism 4 includes an internally threaded sleeve 401, the rear end of which is fixedly connected to the front end of the rotating shaft of the motor 3; The front side of the internal threaded sleeve 401 is rotatably provided with a threaded rotating rod 402, the side of the threaded rotating rod 402 is rotatably provided with a round sleeve 403, the side of the round sleeve 403 is fixedly provided with four connecting blocks 404, and the front side of the internal threaded sleeve 401 is fixedly sleeved with a gear 4010; A cross bar 405 is fixedly sleeved on the side of the internal thread sleeve 401, and T-shaped grooves 406 are provided on the left and right sides of the front side of the horizontal bar of the cross bar 405 and the upper and lower sides of the front side of the vertical bar of the cross bar 405; A T-shaped plate 407 is slidably provided inside the T-shaped slot 406. The side of the horizontal plate of the T-shaped plate 407 is slidably fitted inside the T-shaped slot 406. The four T-shaped plates 407 are grouped into two, and the side surfaces of the horizontal blocks on each side facing each other are all arcuate surfaces. A rubber strip 408 is fixedly provided on the arcuate surface of the horizontal block of the T-shaped plate 407. Two connecting plates 409 are rotatably provided on the front and rear sides of the vertical plates of the T-shaped plate 407. The interior of the connecting plate 409 is rotatably fitted with the side surfaces of the connecting block 404. In this embodiment, through the precise rotational motion of the threaded rotating rod 402, its external thread and the internal thread of the internal threaded sleeve rod 401 form a tight spiral pair, thereby converting the rotational motion into precise axial displacement. When the operator applies a clockwise rotational torque, the threaded rotating rod 402 will be smoothly retracted along the axial direction of the internal threaded sleeve rod 401, realizing controllable feeding motion. During this process, the circular sleeve 403 rigidly connected to the threaded rotating rod 402 will produce synchronous axial movement to ensure the coordinated operation of the entire transmission mechanism. Four connecting blocks 404 are equidistantly distributed in a cross shape on the outer circumference of the circular sleeve 403. Each connecting block 404 is equipped with a slidable T-shaped plate 407. The T-shaped plate 407 is connected to the fixed structure. The T-slots 406 form a high-precision fit. During axial movement, the T-slots 406 impose bidirectional constraints on the motion trajectory of the T-plates 407, ensuring that they can only slide stably along a preset path. As the threaded rotating rod 402 continues to be screwed in, the four T-plates 407 simultaneously expand radially outward under the control of the guide mechanism, thereby pushing the elastic rubber strips 408 connected to them to expand evenly. The precise fit between the T-slots 406 and the T-plates 407 ensures the stability and repeatability of the motion trajectory, avoiding deflection or jamming. At the same time, the elastic deformation characteristics of the rubber strips 408 enable them to adapt to slight tolerance variations of different inner diameters, providing sufficient contact pressure while avoiding scratches or wear on the bearing working surface. Example 2: See also Figure 1 、 Figure 2 、 Figure 4 、 Figure 8 , this embodiment provides a technical solution: The adjustment mechanism 7 includes an L-shaped rod 701, which is fixedly mounted on the top of the vertical block of the L-shaped block 6. An L-shaped bar 702 is fixedly mounted on the left side of the front side of the horizontal bar of the L-shaped rod 701. The left and right sides of the bottom of the vertical bar of the L-shaped bar 702 and the left and right sides of the bottom of the vertical bar of the L-shaped rod 701 are beveled. The bottom side of the vertical bar of the L-shaped rod 701 contacts the side of the gear 4010. The shape of the moving block 9 and the shape of the interior of the moving groove 8 are both L-shaped. A rack 901 is fixedly provided on the top of the moving block 9. The side of the rack 901 slides with the lower side of the vertical rod of the L-shaped rod 701 and the side of the rack 901. A circular shaft 902 is rotatably provided on the front side of the moving block 9. The side of the circular shaft 902 and the side of the four T-shaped plates 407 are sleeved with belts 903. In this embodiment, the L-shaped block 6 is used to precisely guide the L-shaped rod 701 to complete linear displacement in the vertical direction. When the operator starts the adjustment mechanism, the L-shaped rod 701 rises steadily under the constraint of the guide device, and its vertical rod portion is gradually separated from the precise meshing surface of the rack 901. This process completely releases the lateral movement constraint on the rack 901. After the constraint is released, the moving block 9 can achieve smooth position adjustment under low friction conditions by virtue of its precise sliding fit with the moving groove 8. The displacement of the moving block 9 is directly transmitted to the circular shaft 902 through a rigid connection, so that it moves accurately to the preset working position, ensuring that the belt 903 sleeved between the circular shaft 902 and the outer ring of the experimental bearing can automatically reach the ideal tension state, so that the belt 903 maintains the best tension distribution on the entire contact circumference. When the experimental bearing enters the high-speed rotation state, the radial slip trend of the belt 903 caused by the centrifugal effect is overcome through the contact pressure and friction coefficient. This stable friction transmission characteristic ensures the continuity and reliability of torque transmission, providing a solid guarantee for the accuracy of the experimental data. After the positioning is completed, the L-shaped rod 701 is accurately reset under the elastic restoring force of the compression spring 10, and its vertical rod part is re-embedded in the tooth gap of the rack 901 to form a reliable mechanical interlocking. The main positioning function is achieved through the meshing of the rack, and at the same time, continuous auxiliary constraints are provided with the help of the spring preload, ensuring that the geometric parameters of the transmission system do not shift during the experimental cycle. Example 3: See also Figure 2 、 Figure 5 、 Figure 6 、、 Figure 7 、 Figure 8 , this embodiment provides a technical solution: The fixing mechanism 4 includes an internally threaded sleeve 401, the rear end of which is fixedly connected to the front end of the rotating shaft of the motor 3; The front side of the internal threaded sleeve 401 is rotatably provided with a threaded rotating rod 402, and the side of the threaded rotating rod 402 is rotatably provided with a round sleeve 403. Four connecting blocks 404 are fixedly provided on the side of the round sleeve 403. The front side of the internal threaded sleeve 401 is fixedly sleeved with a gear 4010. It is worth noting that a one-way bearing is sleeved inside the gear 4010, and the inner ring of the one-way bearing is fixedly matched with the side of the threaded rotating rod 402. The one-way bearing can ensure that the threaded rotating rod 402 in a fixed state can rotate simultaneously with the internal threaded sleeve 401, but will not move back and forth inside the internal threaded sleeve 401. The adjustment mechanism 7 includes an L-shaped rod 701, which is fixedly mounted on the top of the vertical block of the L-shaped block 6. An L-shaped bar 702 is fixedly mounted on the left side of the front side of the horizontal bar of the L-shaped rod 701. The left and right sides of the bottom of the vertical bar of the L-shaped bar 702 and the left and right sides of the bottom of the vertical bar of the L-shaped rod 701 are beveled. The bottom side of the vertical bar of the L-shaped rod 701 contacts the side of the gear 4010. The side of the horizontal bar of the L-shaped bar 701 is fixedly provided with a reinforcing diagonal bar 703, and the side of the reinforcing diagonal bar 703 is fixedly matched with the side of the horizontal bar of the L-shaped bar 702; A placement groove 101 is provided on the top of the horizontal plate of the C-shaped laboratory table 1. A sealing baffle 102 is slidably provided inside the placement groove 101, and a pull handle 103 is fixedly provided on the top of the sealing baffle 102. The interior of the placement groove 101 is filled with lubricating silicone grease. A reinforcement plate 104 is fixedly provided at the bottom of the two vertical plates of the C-shaped laboratory table 1. One side of the reinforcement plate 104 is fixedly matched with the bottom of the horizontal plate of the C-shaped laboratory table 1. Fixed blocks 105 are fixedly provided on the left and right sides of the two vertical plates of the C-shaped laboratory table 1. In this embodiment, when the L-shaped rod 701 moves upward steadily in the vertical direction, it will synchronously drive the L-shaped bar 702 linked with it to complete the coordinated movement. During this process, the vertical bar part of the L-shaped bar 702 is gradually separated from the tooth profile contact surface of the gear 4010. When the constraint is completely released, the threaded rotating rod 402 enters the adjustable state. At this time, the operator can accurately adjust the radial clamping force according to the actual size of the inner ring of the bearing of different specifications. When the vertical bar of the L-shaped rod 701 is on the side of the gear 4010, the threaded rotating rod 402 can be completely locked through the mechanical interference of precise positioning. This rigid constraint method ensures the absolute stability of the clamping force during the experiment. The inner surface of the placement groove 101 is treated with a special process and filled with high-performance lubricating silicone grease, which not only provides a precise positioning reference for the bearing to be tested, but also forms a long-lasting and effective anti-oxidation protective layer. This protective layer can completely isolate the shaft The contact between the metal surface and the air is effectively suppressed, and the electrochemical corrosion caused by environmental humidity is effectively suppressed. At the same time, the sealing baffle 102 is perfectly matched with the placement groove 101 through a high-precision sliding guide. Its closed state can build a completely sealed protective space. First, it can completely block the invasion of external dust particles into the bearing raceway. Second, it can prevent the volatilization loss of lubricant. The reinforcement plate 104 and the fixed block 105 are optimized by finite element analysis and are symmetrically distributed along the key stress concentration area of ​​the C-shaped experimental table 1. This layout combines the dual advantages of multi-point rigid connection and triangular stable configuration. On the one hand, it disperses the load by increasing the number of constraint points, and on the other hand, it uses the natural stability of the triangular structure to improve the overall rigidity. This structural design gives the test bench excellent torsional stiffness, which can effectively suppress structural resonance or elastic deformation caused by dynamic loads in high-speed rotation tests, ensuring data reliability and operational safety during the experimental process. The use method and advantages of the present invention: The use method of the life simulation experimental device for micro high-precision bearings has the following working process: like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown: in the initial operation stage, the rotation of the threaded rotating rod 402 drives the circular sleeve 403 to move forward in the axial direction. At this time, the four evenly distributed T-shaped plates 407 are synchronously retracted to the central axis position under the action of the guide mechanism, forming an initial state that is convenient for bearing installation. The operator can easily put the bearing to be tested into the positioning space formed by the four T-shaped plates 407 to ensure that the bearing center is accurately aligned with the fixture axis. When the threaded rotating rod 402 is rotated clockwise, the system enters the precision clamping stage. The rotation of the threaded rotating rod 402 is converted into axial displacement of the circular sleeve 403 through the precision thread pair, driving the four connecting blocks 404 to move backward synchronously. The movement of the connecting block 404 is converted into radial motion through the unique cooperation relationship between the T-shaped slot 406 and the T-shaped plate 407. During this process, the connecting plate 409 on the side of each connecting block 404 produces a precise deflection angle, driving the four T-shaped plates 407 to achieve completely synchronized radial expansion movement. This innovative motion conversion mechanism ensures that all support points are evenly stressed, providing stable radial support for the inner ring of the bearing being tested. By precisely controlling the rotation angle of the threaded rotating rod 402, the operator can fine-tune the axial position of the circular sleeve 403 and the connecting block 404, thereby accurately controlling the radial expansion amount of the T-shaped plate 407. This stepless adjustment feature enables the fixture to perfectly adapt to the testing requirements of bearings with different inner diameters. During the adjustment process, the unique T-slot guide system ensures that all support points maintain synchronous movement, thereby enabling rapid support of bearings with different inner diameters. By first applying force upward to the L-shaped block 6, the L-shaped rod 701 rigidly connected to it is driven to move smoothly upward along the vertical guide rail. During this process, the raised part of the L-shaped rod 701 produces progressive compression on the compression spring 10, and at the same time, the vertical block at the end of the L-shaped block 6 moves upward until it is completely out of engagement with the rack 901, releasing the lock on the transmission system. At this time, the operator can adjust the relative position of the rack 901 and the circular shaft 902 through the moving block 9 according to the current test requirements. The displacement of the moving block 9 is controlled by the moving slot 8 to ensure that the axis of the circular shaft 902 remains parallel to the center of the bearing, thereby accurately adjusting the tension of the belt 903 sleeved on the circular shaft 902 and the outer ring of the bearing to be tested. After completing the position adjustment, Slowly release the force on the L-shaped block 6. The compression spring 10 pushes the L-shaped rod 701 downward accurately along the guide structure under the action of the elastic restoring force until the vertical rod at the front end of the L-shaped rod 701 is reinserted into the tooth gap of the rack 901. This mechanical interlocking structure achieves self-locking through the friction force generated by the contact between the tooth surfaces, ensuring the stability of the geometric parameters of the transmission system during the test. During the test operation, the output shaft of the motor 3 drives the internal threaded sleeve 401 to rotate through the coupling. The rotational motion is transmitted to the T-shaped plate 407 assembly through the threaded pair, driving the clamped inner ring of the bearing to rotate on a fixed axis. At the same time, the belt 903, which maintains appropriate tension, forms an effective friction transmission with the outer ring of the bearing, so that the inner ring of the bearing can be subjected to a rotation test. By applying a vertical upward force to the L-shaped block 6, the force is transmitted to the L-shaped rod 701 and the L-shaped bar 702 at the same time through the rigid connection. Under the constraint of the guide groove, the L-shaped rod 701 and the L-shaped bar 702 maintain synchronous vertical movement, and the movement trajectories of the two are completely parallel. As the L-shaped bar 702 moves upward, the vertical bar part at its end slides smoothly along the tooth profile inclined surface of the gear 4010, and finally completely disengages from the meshing state, releasing the rotation restriction of the gear 4010. At this time, the operator can freely rotate the threaded rotating rod 402, and realize axial feed movement through the cooperation of its external thread and the internal thread of the internal threaded sleeve rod 401. The rotation movement of the threaded rotating rod 402 drives the front end clamping mechanism to produce radial displacement. The clamping mechanism adopts a multi-slider synchronous expansion design. The four clamping jaws maintain synchronous movement under the constraint of the guide groove. When the threaded rotating rod 402 rotates, the clamping jaws produce corresponding radial displacement according to the thread lead, thereby accurately adapting to different inner diameter sizes. The size of the clamping force of the bearing can be fine-tuned by controlling the rotation angle of the threaded rotating rod 402, ensuring that the bearing can be firmly fixed without causing excessive contact stress. After completing the bearing positioning, the operator releases the force on the L-shaped block 6. Under the action of the rebound force of the compression spring 10, the vertical bar of the L-shaped bar 702 re-engages along the tooth profile of the gear 4010. The meshing process is divided into two stages. First, the inclined surface of the vertical bar contacts the gear tooth profile and is automatically aligned under the action of gravity; then the flat surface of the vertical bar is completely fitted with the side surface of the gear to form a surface contact lock. This double locking mechanism ensures that a stable clamping state can be maintained under various speed conditions. During the test, different specifications of bearing samples can be quickly switched. When replacing, only the standard operating procedure needs to be repeated. The clamping diameter is adjusted by rotating the threaded rotating rod 402, and then the position is locked by the L-shaped bar 702. The bearing with large or small inner diameter differences can be quickly fixed for experiments. The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A life simulation experimental device for micro high-precision bearings, comprising a C-shaped experimental table (1), wherein a support plate (2) is fixedly provided on the top of a horizontal plate of the C-shaped experimental table (1); It is characterized by: It also includes a motor (3), the motor (3) is fixedly arranged on the front side of the support plate (2), the rotating shaft of the motor (3) passes through the front side of the support plate (2) and is rotatably provided with a fixing mechanism (4) for limiting the bearing position; An L-shaped groove (5) is provided in the middle of the front side of the support plate (2), an L-shaped block (6) is slidably provided inside the L-shaped groove (5), a compression spring (10) is fixedly provided on the top of the transverse block of the L-shaped block (6), the top end of the compression spring (10) is fixedly connected to the top of the inner wall of the L-shaped groove (5), an adjustment mechanism (7) is fixedly provided on the top of the L-shaped block (6), a movable groove (8) is provided on the left side of the front side of the support plate (2), and a movable block (9) is slidably provided inside the movable groove (8).

2. A life simulation experimental device for micro high-precision bearings according to claim 1, characterized in that: The fixing mechanism (4) comprises an internally threaded sleeve rod (401), the rear end of the internally threaded sleeve rod (401) being fixedly connected to the front end of the rotating shaft of the motor (3); The front side of the internally threaded sleeve (401) is rotatably provided with a threaded rotating rod (402), the side of the threaded rotating rod (402) is rotatably provided with a circular sleeve (403), the side of the circular sleeve (403) is fixedly provided with four connecting blocks (404), and the front side of the internally threaded sleeve (401) is fixedly sleeved with a gear (4010).

3. The life simulation experimental device for micro high-precision bearings according to claim 2, characterized in that: A cross bar (405) is fixedly sleeved on the side of the internal threaded sleeve rod (401), and T-shaped grooves (406) are provided on the left and right sides of the front side of the horizontal bar of the cross bar (405) and the upper and lower sides of the front side of the vertical bar of the cross bar (405); The T-shaped slot (406) is internally slidably provided with a T-shaped plate (407), and the side surface of the horizontal plate of the T-shaped plate (407) is slidably matched with the inside of the T-shaped slot (406). The four T-shaped plates (407) are grouped into two, and the side surfaces of the horizontal blocks on each side facing each other are all arc surfaces, and the arc surfaces of the horizontal blocks of the T-shaped plates (407) are fixedly provided with rubber strips (408). The front and rear sides of the vertical plates of the T-shaped plates (407) are both rotatably provided with two connecting plates (409), and the interior of the connecting plates (409) is rotatably matched with the side surface of the connecting block (404).

4. The life simulation experimental device for micro high-precision bearings according to claim 2, characterized in that: The adjustment mechanism (7) comprises an L-shaped rod (701), the L-shaped rod (701) being fixedly arranged on the top of the vertical block of the L-shaped block (6), an L-shaped bar (702) being fixedly arranged on the left side of the front side of the horizontal bar of the L-shaped rod (701), the left and right sides of the bottom of the vertical bar of the L-shaped bar (702) and the left and right sides of the bottom of the vertical bar of the L-shaped rod (701) being beveled, and the lower side of the vertical bar of the L-shaped rod (701) is in contact with the side surface of the gear (4010).

5. The life simulation experimental device for micro high-precision bearings according to claim 4, characterized in that: The shape of the moving block (9) and the shape of the interior of the moving groove (8) are both L-shaped. A rack (901) is fixedly provided on the top of the moving block (9). The side of the rack (901) is slidably matched with the lower side of the vertical rod of the L-shaped rod (701) and the side of the rack (901). A circular shaft (902) is rotatably provided on the front side of the moving block (9). The side of the circular shaft (902) and the side of the four T-shaped plates (407) are sleeved with a belt (903).

6. The life simulation experimental device for micro high-precision bearings according to claim 4, characterized in that: A reinforcing diagonal rod (703) is fixedly provided on the side of the horizontal rod of the L-shaped rod (701), and the side of the reinforcing diagonal rod (703) is fixedly matched with the side of the horizontal rod of the L-shaped bar (702).

7. The life simulation experimental device for micro high-precision bearings according to claim 1, characterized in that: A placement groove (101) is provided on the top of the horizontal plate of the C-shaped laboratory table (1), a sealing baffle (102) is slidably provided inside the placement groove (101), and a pull handle (103) is fixedly provided on the top of the sealing baffle (102), and the interior of the placement groove (101) is filled with lubricating silicone grease.

8. The life simulation experimental device for micro high-precision bearings according to claim 1, characterized in that: The bottoms of the two vertical plates of the C-shaped laboratory table (1) are fixedly provided with reinforcement plates (104), one side of the reinforcement plates (104) is fixedly matched with the bottom of the horizontal plate of the C-shaped laboratory table (1), and the left and right sides of the two vertical plates of the C-shaped laboratory table (1) are fixedly provided with fixing blocks (105).

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