Rigidity testing mechanism applied to crossed roller bearing

Abstract

The invention belongs to the field of bearing detection, and provides a rigidity testing mechanism applied to a crossed roller bearing, which comprises a rack, an external pressing mechanism, an internal pressing mechanism, a seesaw and a lifting mechanism, the rack is provided with a detection seat used for positioning a bearing outer ring, and the external pressing mechanism is located above the detection seat and can press the bearing outer ring on the detection seat; the inner pressing mechanism is installed on the outer pressing mechanism. Compared with the prior art, the device has the advantages that the outer ring of the bearing is pressed by the external pressing mechanism, and the connecting piece is matched with the nut seat, so that the inner ring of the bearing is automatically aligned, screwed and pressed when the driving disc is switched between the bearing position and the fixed position, and the detection accuracy is improved through the cooperative structural design of the seesaw and the double detection pens. A mechanical lever principle, a precise positioning and pressing mechanism and detection of the bearing inner ring without external force contact are ingeniously fused, high-precision and quantifiable testing of the rigidity difference of the inner ring and the outer ring of the crossed roller bearing is achieved, and the testing efficiency and the testing accuracy are improved.

Description

Technical Field

[0001] This invention belongs to the field of bearing testing, specifically relating to a rigidity testing mechanism for crossed roller bearings. Background Technology

[0002] Crossed roller bearings are precision rotating units that are not only small in size but can also withstand axial force, radial force, and overturning moment simultaneously. They are widely used in the structures of CNC rotary tables and robot joints in CNC machine tools and other equipment. The rigidity of a crossed roller bearing, which is the relative deformation of the inner and outer rings after the bearing is subjected to external force (mainly lateral tilting force), is an important testing indicator for crossed roller bearings.

[0003] During bearing rigidity testing, the inner and outer rings of the crossed roller bearing need to be fixed to the relevant components of the testing device. Currently, conventional rigidity testing methods typically involve manual operation. This means that for each bearing being tested, both the inner and outer rings need to be fixed using screws or the upper and lower fixing plates of the testing device. This process not only makes disassembling and installing screws cumbersome but also affects overall work efficiency. Furthermore, manual testing inevitably introduces measurement errors related to the bearing's centering, leading to inaccurate test results and failing to meet the quality control requirements of high-precision fixed bearings. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a rigidity testing mechanism for crossed roller bearings that features a simple structure, good stability, high-precision rigidity assessment, and automated alignment and locking.

[0005] The objective of this invention can be achieved by addressing the following technical problem: proposing a rigidity testing mechanism for crossed roller bearings, comprising a frame, an external pressure mechanism, an internal pressure mechanism, a seesaw, and a lifting mechanism;

[0006] The frame is provided with a detection seat for positioning the outer ring of the bearing, and the external pressure mechanism is located above the detection seat and can press the outer ring of the bearing onto the detection seat;

[0007] The internal pressure mechanism is mounted on the external pressure mechanism. The internal pressure mechanism includes a connector and a drive disc. A nut seat is mounted on the seesaw. The connector is movably connected to the nut seat and can press and fix the inner ring of the bearing onto the nut seat. The drive disc can switch between the bearing position and the fixed position of the connector.

[0008] The frame is equipped with a first detection pen and a second detection pen. The first detection pen is in contact with the top wall of one end of the seesaw in a vertical direction, and the second detection pen is in contact with the bottom wall of the other end of the seesaw in a vertical direction. A detection weight is suspended at the end of the seesaw near the first detection pen.

[0009] The lifting mechanism is used to support the seesaw, and can be disengaged to the underside of the seesaw after the connector is connected to the nut seat, so as to replace the testing weight to test the difference in values ​​between the two testing pens;

[0010] When the drive disk is in the bearing position, the drive disk can drive the connector to move down synchronously, so that the connector is aligned with the nut seat;

[0011] When the drive disc switches from the bearing position to the fixed position, the external pressure mechanism presses against the outer ring of the bearing. The drive disc and the connecting member form a clearance in the vertical direction, so that when the drive disc rotates, it can drive the connecting member to be screwed onto the nut seat and pressed against the inner ring of the bearing.

[0012] In the above-mentioned rigidity testing mechanism for crossed roller bearings, the bottom wall of the drive disc is symmetrically provided with bearing blocks, the connecting member includes a fixing plate and a screw, the screw is connected to the bottom wall of the fixing plate and can be screwed onto the nut seat; the fixing plate is symmetrically provided with anti-disengagement blocks, the bearing blocks move against the inner top wall of the anti-disengagement blocks, and together form the clearance gap when there is a height difference between them.

[0013] In the rigidity testing mechanism applied to crossed roller bearings described above, when the external pressure mechanism presses against the outer ring of the bearing, the travel of the fixed plate pressing against the inner ring of the bearing is less than the height difference between the bearing block and the anti-disengagement block.

[0014] In the rigidity testing mechanism for crossed roller bearings described above, the fixing plate is further provided with an anti-detachment pin located between two adjacent anti-detachment arc blocks.

[0015] In the aforementioned rigidity testing mechanism applied to crossed roller bearings, the external pressure mechanism includes:

[0016] A lifting cylinder is mounted on the frame, and a movable frame is connected to the movable end of the lifting cylinder;

[0017] Guide slide rails are symmetrically arranged on the frame in the vertical direction. Guide sliders are connected to the side walls of the movable frame. The guide sliders are movably engaged with the guide slide rails.

[0018] An external pressure block is connected to the bottom wall of the movable frame, and the external pressure block is movably pressed against the outer ring of the bearing.

[0019] In the aforementioned rigidity testing mechanism applied to crossed roller bearings, the internal pressure mechanism further includes:

[0020] A fixed base is installed on the movable frame, and a fixed sleeve is connected to the fixed base;

[0021] A right-angle reducer and a drive motor are mounted on the fixed sleeve. The input end of the right-angle reducer is connected to the drive motor, and the output end is connected to a rotating shaft via a coupling. The drive disc is sleeved on the bottom of the rotating shaft and is detachably connected to it.

[0022] Several auxiliary bearings are disposed in the fixed seat and mounted on the rotating shaft. The bottom wall of the fixed seat is connected to a bearing cover plate. A spacer is mounted on the rotating shaft. The bearing cover plate and the spacer are used to limit the displacement of the auxiliary bearings along the axis of the rotating shaft.

[0023] In the above-mentioned rigidity testing mechanism for crossed roller bearings, the detection seat is also provided with a displacement sensor and a limiting pin. The detection end of the displacement sensor abuts against the side wall of the seesaw. The end of the seesaw near the second detection pen has an oblong hole, and the limiting pin is movably inserted into the oblong hole.

[0024] In the above-mentioned rigidity testing mechanism for crossed roller bearings, the anti-disengagement block includes a circular arc portion and an arc-shaped extension portion that are symmetrically arranged, and the bearing block movably abuts against the circular arc portion; the arc-shaped extension portion extends outward along the arc direction of the circular arc portion, and the inner diameter of the arc-shaped extension portion is smaller than the inner diameter of the circular arc portion.

[0025] In the aforementioned rigidity testing mechanism applied to crossed roller bearings, the lifting mechanism includes:

[0026] A linear bearing housing is mounted on the frame, and a linear bearing is disposed within the linear bearing housing;

[0027] A lifting cylinder and a support plate are provided. The lifting cylinder is mounted on the support plate, and the output end of the lifting cylinder is connected to the bottom wall of the linear bearing seat. A main shaft is movably connected inside the support plate, and the main shaft is connected to the linear bearing.

[0028] The transition plate is movably connected to the seesaw via a first positioning pin. Annular protrusions are formed on both axial sides of the transition plate. Annular grooves are provided at the top of both the seesaw and the main shaft. The annular protrusions are movably disposed within the annular grooves, and the annular protrusion at the bottom of the transition plate is movably connected to the main shaft via a second positioning pin.

[0029] The aforementioned rigidity testing mechanism for crossed roller bearings also includes:

[0030] The mounting plate is connected to the frame via support columns;

[0031] The system includes a bearing cylinder and a bearing plate. The bearing cylinder is mounted on the mounting plate, and the output end of the bearing cylinder is connected to a movable plate. The bearing plate is detachably connected to the movable plate and is used to support the test weight, so that there is a height difference between the top of the suspension bolt connected to the test weight and the seesaw.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The rigidity testing mechanism for crossed roller bearings of the present invention uses an external pressure mechanism to press the outer ring of the bearing, and at the same time uses a connecting piece and a nut seat to achieve automatic alignment and tightening of the inner ring of the bearing when the drive disc switches between the bearing position and the fixed position. In the collaborative structural design of the seesaw and the double detection pen, the mechanical lever principle, the precise positioning and pressing mechanism and the detection of the inner ring of the bearing without external force contact are cleverly integrated, so as to achieve high-precision and quantifiable testing of the rigidity difference between the inner and outer rings of the crossed roller bearing, thereby improving the testing efficiency and accuracy.

[0034] (2) Add anti-detachment pins between two adjacent anti-detachment arc blocks on the fixed plate to further limit the phenomenon of the connector separating from the anti-detachment arc block during rotation, enhance the connection stability between the connector and the drive disk, and improve the safety of equipment operation and the consistency of test results.

[0035] (3) A displacement sensor and a limit pin are added to the test seat. The displacement sensor monitors the lateral displacement of the seesaw in real time and then feeds it back to the drive motor to adjust the seesaw to the accurate test position by reversing the rotation. This avoids the test data distortion caused by abnormal deflection during the test and significantly improves the safety and data reliability of the test process. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of this application;

[0037] Figure 2 yes Figure 1 A sectional view;

[0038] Figure 3 This is a schematic diagram of the drive disk when it is in the load-bearing position;

[0039] Figure 4 This is a schematic diagram of the structure when the drive disk is in a fixed position;

[0040] Figure 5This is a schematic diagram of the limit pin and displacement sensor;

[0041] Figure 6 It is an exploded view of the seesaw, main shaft, and transition plate;

[0042] Figure 7 This is a structural diagram of the bearing cylinder, bearing plate, and testing weight.

[0043] In the diagram, 1 is the bearing; 10 is the outer ring; and 11 is the inner ring.

[0044] 2. Frame; 20. Detection base; 200. Displacement sensor; 201. Limit pin; 21. First detection pen; 22. Second detection pen; 23. Detection weight; 230. Suspension bolt;

[0045] 3. External pressure mechanism; 30. Lifting cylinder; 300. Moving frame; 301. Guide slider; 31. Guide slide rail; 32. External pressure block;

[0046] 4. Internal pressure mechanism; 40. Connecting parts; 400. Fixing plate; 401. Anti-arc block; 401a. Arc part; 401b. Arc extension part; 401c. Assembly gap; 402. Screw; 403. Anti-disengagement pin; 41. Drive disc; 410. Bearing block; 411. Guide ring; 420. Clearance gap; 43. Fixing seat; 430. Bearing cover plate; 44. Fixing sleeve; 45. Right angle reducer; 450. Coupling; 451. Rotating shaft; 452. Spacer; 46. Drive motor; 47. Auxiliary bearing;

[0047] 5. Seesaw; 50. Nut seat; 51. Waist-shaped hole; 52. First locating pin; 53. Mounting hole;

[0048] 6. Lifting mechanism; 60. Linear bearing housing; 61. Linear bearing; 62. Lifting cylinder; 63. Bearing plate; 64. Main shaft; 640. Annular groove; 65. Transition plate; 650. Annular protrusion; 651. Second positioning pin;

[0049] 70. Mounting plate; 71. Support column; 72. Bearing cylinder; 73. Bearing plate; 74. Moving plate. Detailed Implementation

[0050] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0051] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0052] like Figures 1 to 7 As shown, the present invention provides a rigidity testing mechanism for a crossed roller bearing 1, comprising a frame 2, an external pressure mechanism 3, an internal pressure mechanism 4, a seesaw 5, and a lifting mechanism 6.

[0053] The frame 2 is equipped with a detection seat 20 for positioning the outer ring 10 of the bearing 1. An external pressure mechanism 3 is located above the detection seat 20 and can press the outer ring 10 of the bearing 1 onto the detection seat 20. An internal pressure mechanism 4 is installed on the external pressure mechanism 3. The internal pressure mechanism 4 includes a connector 40 and a drive disk 41. A nut seat 50 is installed on the seesaw 5. The connector 40 is movably connected to the nut seat 50 and can press and fix the inner ring 11 of the bearing 1 onto the nut seat 50. The drive disk 41 can switch between the bearing position and the fixed position of the connector 40. A first detection pen 21 and a second detection pen 22 are installed on the frame 2. The first detection pen 21 contacts the top wall of one end of the seesaw 5 in a vertical direction, and the second detection pen 22 contacts the other end of the seesaw 5 in a vertical direction. The bottom wall of the seesaw 5; and a test weight 23 is suspended at the end of the seesaw 5 near the first test pen 21; the lifting mechanism 6 is used to support the seesaw 5, and can be disengaged to the bottom of the seesaw 5 after the connecting piece 40 is connected to the nut seat 50, so as to replace the test weight 23 to test the difference in values ​​between the two test pens; when the drive disk 41 is in the bearing position, the drive disk 41 can drive the connecting piece 40 to move down synchronously, so that the connecting piece 40 is aligned with the nut seat 50; when the drive disk 41 switches from the bearing position to the fixed position, the external pressure mechanism 3 presses against the outer ring 10 of the bearing 1, and the drive disk 41 and the connecting piece 40 form a clearance gap 420 in the vertical direction, so that when the drive disk 41 rotates, it can drive the connecting piece 40 to be screwed onto the nut seat 50 and pressed against the inner ring 11 of the bearing 1.

[0054] Specifically, such as Figures 1 to 7 As shown, when a worker or robotic arm places the crossed roller bearing 1 to be inspected into the inspection seat 20, the outer ring 10 of the bearing 1 is positioned by the inspection seat 20, while the inner ring 11 of the bearing 1 is supported by the nut seat 50. Simultaneously, the lifting mechanism 6 supports the seesaw 5 from below, keeping it horizontal and stable for subsequent operations. As the external pressure mechanism 3 drives the entire internal pressure mechanism 4 to move downwards synchronously, during this process, such as... Figure 2 As shown, the connector 40 aligns with the nut seat 50 the moment it moves downward (at this time, the drive disc 41 still supports the connector 40, i.e.) Figure 2The drive disc 41 is shown in the bearing position to prevent the entire connecting piece 40 from tilting and affecting the accuracy of subsequent clamping of the inner ring 11 of the bearing 1. Meanwhile, the external pressure mechanism 3... Figure 2 As the state shown continues to move downwards, the drive disk 41 moves relative to the connector 40 to... Figure 4 At the fixed position shown, the external pressure mechanism 3 has already completed the clamping and fixing of the outer ring 10 of the bearing 1. Since the connecting piece 40 is not yet under force on the outer ring 10 of the bearing 1, the internal pressure mechanism 4 drives the drive disk 41 to rotate, thereby pushing the connecting piece 40 to rotate around its own axis. As the connecting piece 40 is screwed into the internal thread hole of the nut seat 50 (not shown in the figure), it completes the synchronous downward clamping of the inner ring 11 of the bearing 1, realizing the axial fixing of the inner ring 11. It is worth noting that the drive disk 41 does not apply downward pressure to the connecting piece 40 at this time, which also means that the inner ring 11 of the bearing 1 is clamped and fixed by the nut seat 50 on the seesaw 5 in conjunction with the connecting piece 40. For this reason, as the lifting mechanism 6 moves away from the seesaw 5, the detection weight 23 at the far end of the seesaw 5 can be changed to different masses, and the rigidity of the bearing 1 can be judged by the difference in values ​​fed back by the first detection pen 21 and the second detection pen 22. In summary, this invention uses an external pressure mechanism 3 to press the outer ring 10 of the bearing 1, while simultaneously utilizing the connection 40 and the nut seat 50 to enable the drive disc 41 to automatically align and tighten the inner ring 11 of the bearing 1 when switching between the bearing position and the fixed position. The collaborative structural design of the seesaw 5 and the dual detection pens cleverly integrates the mechanical lever principle, the precise positioning and pressing mechanism, and the detection of the inner ring 11 of the bearing 1 without external force contact. By applying a load through the suspended detection weight 23, the rigid deformation of the inner ring 11 of the bearing 1 under stress is accurately reflected, improving testing flexibility and efficiency. The overall structure achieves synchronous positioning and loading of the inner and outer rings 10 of the crossed roller bearing 1, effectively improving the accuracy and efficiency of rigidity testing.

[0055] It should be noted that both the first detection pen 21 and the second detection pen 22 in this embodiment adopt a pneumatic detection structure, and their structure and working principle can be referenced from existing technologies. In addition, before detection, both the first detection pen 21 and the second detection pen 22 are corrected by the seesaw 5. By changing the detection weights 23 of different specifications, the detection difference between the two detection pens is obtained. Based on the calculation formula known in the industry (which belongs to the prior art and is not within the protection scope of this solution, so it will not be described in detail), and with the help of big data, the rigidity value of the bearing 1 can be obtained.

[0056] The bottom wall of the drive plate 41 is symmetrically provided with bearing blocks 410. The connector 40 includes a fixing plate 400 and a screw 402. The screw 402 is connected to the bottom wall of the fixing plate 400 and can be screwed onto the nut seat 50. The fixing plate 400 is symmetrically provided with anti-detachment blocks 401. The bearing block 410 moves against the inner top wall of the anti-detachment block and together form a clearance gap 420 when there is a height difference between them.

[0057] like Figures 2 to 4 As shown, the anti-arc detachment block 401 in this solution has an inverted L-shaped structure (see reference). Figure 3 As shown in the structure, when the fixing plate 400 is pressed against the inner ring 11 of the bearing 1, it can be fixedly connected to the nut seat 50 by the screw 402. At this time, the fixing plate 400 and the nut seat 50 are respectively pressed against the top wall and bottom wall of the inner ring 11 of the bearing 1. In addition, the fixed connection between the nut seat 50 and the seesaw 5 allows the deformation of the inner ring 11 of the bearing 1 relative to the outer ring 10 of the bearing 1 to be applied under the load force of the test weight 23. Compared with the traditional manual inspection method of prying up the inner ring 11 of the bearing 1, this scheme can accurately detect the bearing 1 after the inner ring 11 of the bearing 1 is fixed without external force contact (i.e., the drive disk 41 and the bearing block 410 no longer support the connecting part 40). On the other hand, it ensures the centering detection of the bearing 1, improving the testing efficiency and accuracy. In addition, as Figure 3 As shown, this structure can reliably drive the connecting piece 40 to move downwards and align with the nut seat 50 when the drive disc 41 is in the bearing position, and forms a clearance 420 after switching to the fixed position (see reference). Figure 4 The structure shown allows the drive disc 41 to rotate, which only drives the screw 402 to turn without affecting the pressing state of the external pressure mechanism 3. This effectively avoids interference with the already pressed outer ring 10 during the driving process, and realizes the linkage operation of pressing the outer ring 10 and inner ring 11 of the bearing 1, thereby improving the reliability of locking and the safety of operation.

[0058] The anti-detachment arc block 401 includes a symmetrically arranged arc portion 401a and an arc-shaped extension portion 401b. The bearing block 410 movably abuts against the arc portion 401a. The arc-shaped extension portion 401b extends outward along the arc direction of the arc portion 401a, and the inner diameter of the arc-shaped extension portion 401b is smaller than the inner diameter of the arc portion 401a.

[0059] like Figures 2 to 4 As shown, this solution also includes a guide ring 411 on the drive disk 41, located above the support block 410. When the drive disk 41 is in the support position, the guide ring 411 moves against the inner wall of the arc-shaped extension 401b to ensure... Figure 3The stability of the connection between the drive disk 41 and the anti-disengagement block 401 is ensured to prevent relative swaying during synchronous descent from affecting the subsequent pressing operation on the inner ring 11 of the bearing 1; after the external pressure mechanism 3 presses the outer ring 10 of the bearing 1, the drive disk 41 moves relative to the anti-disengagement block 401 from... Figure 3 The load-bearing position shown has been switched to Figure 4 In the fixed position shown, the drive disc 41 can drive the fixed plate 400 to rotate by pushing the side wall of the arc portion 401a. This completes the pressing of the fixed plate 400 against the top wall of the inner ring 11 of the bearing 1, while simultaneously achieving a fixed connection between the screw 402 and the nut seat 50. Therefore, this structure not only ensures a smooth sliding fit between the bearing block 410 and the anti-detachment arc block 401, but also enhances the anti-detachment performance and improves the reliability of the linkage between the drive disc 41 and the connecting piece 40.

[0060] When the external pressure mechanism 3 presses the outer ring 10 of the bearing 1, the travel of the fixed plate 400 pressing the inner ring 11 of the bearing 1 is less than the height difference between the bearing block 410 and the anti-arc release block 401. Figures 2 to 4 As shown, this design means that the support block 410 is in Figure 4 When the position shown is reached (i.e., the drive disc 41 is in a fixed position, and the external pressure mechanism 3 has completed the pressing operation on the outer ring 10 of the bearing 1), as shown... Figure 4 The distance from the bottom wall of the fixed plate 400 to the outer ring 10 of the bearing 1 (e.g., 7 mm) is less than the height difference between the bearing block 410 and the arc-shaped extension 401b (e.g., 10 mm). This also means that during the process of the bearing block 410 pushing the fixed plate 400 to rotate and press the inner ring 11 of the bearing 1, the height difference between the arc-shaped extension 401b and the bearing block 410 gradually decreases until the bottom wall of the fixed plate 400 is pressed against the inner ring 11 of the bearing 1. When the screw 402 is connected in the nut seat 50, there is still a certain gap between the bearing block 410 and the arc-shaped extension 401b. This ensures that the bearing block 410 (or the entire drive plate 41) will not exert any external force on the fixed plate 400 and the anti-disengagement arc block 401, thus ensuring the accuracy of the subsequent rigidity test of the inner ring 11 of the bearing 1 by the test weight 23. In addition, this design also ensures that even when the outer ring 10 is pressed by the external pressure mechanism 3, the connecting piece 40 still has enough freedom to complete the turning action, avoiding the impact of structural interference on the normal pressing of the inner ring 11 of the bearing 1, and ensuring the stability and controllability of the pressing process of the inner ring 11.

[0061] The fixing plate 400 is also provided with an anti-detachment pin 403 located between two adjacent anti-detachment arc blocks 401.

[0062] like Figure 3 and Figure 4As shown, in this embodiment, an assembly gap 401c is formed between the arc-shaped extension 401b and the arc-shaped portion 401a at the bottom of another arc-shaped extension 401b. This assembly gap 401c allows the support block 410 to extend into and rotate to the underside of the arc-shaped extension 401b (see reference). Figure 3 (Structure shown) At this time, the operator can add an anti-detachment pin 403 at the assembly gap 401c (the anti-detachment pin 403 is interference-fitted with the hole on the fixing plate 400, and can be disassembled and assembled at any time, improving convenience), thereby restricting the extension block from moving. Figure 4 After reaching the indicated position, the device rotates in the opposite direction and disengages from the anti-detachment arc block 401, effectively enhancing the stability of the movable connection between the connector 40 and the drive disk 41, improving the safety of equipment operation, and ensuring the accuracy of test results.

[0063] The external pressure mechanism 3 includes: a lifting cylinder 30, which is mounted on the frame 2, and the movable end of the lifting cylinder 30 is connected to a movable frame 300; a guide rail 31, which is symmetrically mounted on the frame 2 in the vertical direction, and a guide slider 301 is connected to the side wall of the movable frame 300, and the guide slider 301 is movably engaged with the guide rail 31; and an external pressure block 32, which is connected to the bottom wall of the movable frame 300, and the external pressure block 32 is movably pressed against the outer ring 10 of the bearing 1.

[0064] like Figure 2 As shown, when the piston rod on the lifting cylinder 30 (or an electric cylinder) extends, it can drive the moving frame 300 along... Figure 2 The vertical downward movement is achieved by the guide rail 31, which not only serves as a guide but also bears part of the load. In conjunction with the guide slider 301, it effectively eliminates lateral swaying and ensures that the outer pressure block 32 presses down vertically. This avoids deformation of the outer ring 10 of the bearing 1 or test errors caused by uneven load. The overall structure is simple, the response is rapid, and the positioning is accurate, significantly improving the stability and repeatability of the pressing process.

[0065] The internal pressure mechanism 4 also includes: a fixed base 43, mounted on the movable frame 300, with a fixed sleeve 44 connected to the fixed base 43; a right-angle reducer 45 and a drive motor 46, mounted on the fixed sleeve 44, with the input end of the right-angle reducer 45 connected to the drive motor 46 and the output end connected to the rotating shaft 451 via a coupling 450, and a drive disc 41 sleeved on the bottom of the rotating shaft 451 and detachably connected to it; and several auxiliary bearings 47, located inside the fixed base 43 and mounted on the rotating shaft 451, with a bearing cover plate 430 connected to the bottom wall of the fixed base 43, and a spacer 452 mounted on the rotating shaft 451, the bearing cover plate 430 and the spacer 452 used to limit the displacement of the auxiliary bearings 47 along the axial direction of the rotating shaft 451.

[0066] like Figures 1 to 4 As shown, the outer pressure block 32 presses against the outer ring 10 of the bearing 1, and the bearing block 410 is at... Figure 4 When in the indicated position, the drive motor 46 (stepper motor or servo motor) can transmit the output torque to the rotating shaft 451 through the right-angle reducer 45. The rotation of the rotating shaft 451 drives the drive disk 41 connected to it to rotate synchronously. Finally, under the force of the bearing block 410 pushing the arc part 401a, the fixing plate 400 presses the inner ring 11 of the bearing 1. At the same time, the screw 402 is connected in the nut seat 50. During the rotation, the rotating shaft 451 is supported by multiple sets of auxiliary bearings 47 (such as single-row cylindrical roller bearings 1 and angular contact bearings 1 at its upper and lower ends) in the fixing seat 43. In addition, the spacer ring 452 is installed between or below the inner ring 11 of the bearing 1. The bearing cover plate 430 presses the outer ring 10 of the bearing 1 from the bottom of the fixing seat 43. Together, they form an axial preload and limiting structure to prevent the auxiliary bearings 47 from axially moving under start-stop or reverse torque, ensuring that the drive disk 41 rotates smoothly and the torque transmission is reliable, thereby improving the tightening accuracy of the inner ring 11 and the service life of the whole machine.

[0067] The detection seat 20 is also equipped with a displacement sensor 200 and a limiting pin 201. The detection end of the displacement sensor 200 abuts against the side wall of the seesaw 5. The end of the seesaw 5 near the second detection pen 22 is provided with a waist-shaped hole 51, and the limiting pin 201 is movably inserted into the waist-shaped hole 51.

[0068] like Figure 1 and Figure 5 As shown, in this embodiment, the seesaw 5 is supported in a horizontal position by the lifting mechanism 6. At this time, the detection end of the displacement detector lightly touches the side wall of the seesaw 5 and outputs an initial zero-point signal. As the bearing block 410 pushes the arc block, the fixing plate 400 can move to press the inner ring 11 of the bearing 1, and at the same time, the screw 402 is tightened in the nut seat 50. During this process, the rotation of the fixing plate 400 and the screw 402 will inevitably drive the seesaw 5 along... Figure 5 A slight horizontal oscillation occurs, and the seesaw 5 is prevented from displacing excessively in the horizontal direction by the contact between the limiting pin 201 and the side wall of the oblong hole 51. It is worth noting that in this design, the outer diameter of the limiting pin 201 is slightly smaller than the inner diameter of the oblong hole 51 to accommodate the limiting pin 201's influence on the seesaw 5 along its horizontal direction. Figure 5 The horizontal rotation limit prevents jamming caused by positional interference between the two. At the same time, the displacement sensor 200 monitors the lateral displacement of the seesaw 5 in real time, thereby determining that the seesaw 5 has shifted at the accurate position. This signal is then fed back to the drive motor 46. By reversing the drive motor 46, the position of the seesaw 5 is adjusted in conjunction with the bearing block 410 pressing against the anti-detachment pin 403. This effectively ensures the accuracy of the test data and significantly improves the safety and reliability of the test process.

[0069] Furthermore, it should be noted that before the aforementioned drive motor 46 reverses, the screw 402 is already tightened inside the nut seat 50, and the fixing plate 400 is pressed against the inner ring 11 of the bearing 1. In other words, the inner ring 11 of the bearing 1, the fixing plate 400, the screw 402, the nut seat 50, and the seesaw 5 can be considered as an integral structure. In addition, the balls between the inner ring 11 and the outer ring 10 of the bearing 1, as the drive motor 46 drives the rotating shaft 451 to rotate, and then move against the limit pin 20 through the bearing block 410. 1. The fixed plate 400 is rotated. Since the offset of the seesaw 5 is small (usually 2-5mm), after the fixed plate 400 rotates slightly (the inner ring 11 of the bearing 1 rotates slightly in sync with the fixed plate 400 by means of the balls), the seesaw 5 is adjusted back to the accurate position. At this time, the detection end of the displacement sensor 200 returns to the normal value, and the drive motor 46 can stop working. After the lifting mechanism 6 moves away, the rigidity of the bearing 1 can be tested by the detection weight 23.

[0070] The lifting mechanism 6 includes: a linear bearing housing 61, mounted on the frame 2, with a linear bearing 611 disposed inside the linear bearing housing 61; a lifting cylinder 62 and a support plate 63, the lifting cylinder 62 being mounted on the support plate 63, and the output end of the lifting cylinder 62 being connected to the bottom wall of the linear bearing housing 61; a main shaft 64 being movably connected inside the support plate 63, the main shaft 64 being connected to the linear bearing 611; and a transition plate 65, which is movably connected to the seesaw 5 via a first positioning pin 52, with annular protrusions 650 formed on both axial sides of the transition plate 65, and annular grooves 640 being opened at the top of both the seesaw 5 and the main shaft 64, the annular protrusions 650 being movably disposed within the annular grooves 640, and the annular protrusions 650 located at the bottom of the transition plate 65 being movably connected to the main shaft 64 via a second positioning pin 651.

[0071] like Figure 1 , Figure 2 , Figure 5 as well as Figure 6 As shown, the output end of the lifting cylinder 62 is fixedly connected to the linear bearing seat 61. During operation, the movement of the lifting cylinder 62 itself drives the main shaft 64 and the transition plate 65 along... Figure 2The vertical reciprocating movement (i.e., the main shaft 64 moving up and down along its axis) is noteworthy. It's important to note that the main shaft 64, transition plate 65, and seesaw 5 in this design are all movably connected. Therefore, the flexible support and precise positioning between the seesaw 5 and the main shaft 64 are achieved through the engagement of the annular protrusion 650 and the annular groove 640, and the connection of the double positioning pins. Specifically, when the seesaw 5 rotates slightly in the horizontal direction, the first positioning pin 52 drives the transition plate 65 to rotate. The transition plate 65, in turn, drives the main shaft 64 to rotate around its axis via the second positioning pin 651, preventing jamming when the transition plate 65 supports the seesaw 5. Consequently, when the main shaft 64 moves the transition plate 65 away from the seesaw 5 along its axis, the first positioning pin 52 can quickly disengage from the seesaw 5. The entire process requires no manual disassembly. Therefore, this structure can stably support the seesaw 5 for initial assembly and can also quickly disengage before testing, avoiding interference with the testing process and ensuring the accuracy of the test data. Furthermore, the engagement of the annular protrusion 650 and the annular groove 640 ensures that the transition plate 65 and the main shaft 64 have good coaxiality and anti-torsional performance. Under the action of the linear bearing 611, the vertical lifting and lowering movement of the main shaft 64 is further ensured. In addition, the one-way thrust ball bearing 1 installed between the bearing plate 63 and the main shaft 64 plays an axial positioning role, ensuring that the shaft will not move due to axial force during operation.

[0072] This solution also includes: a mounting plate 70, which is connected to the frame 2 via a support column 71; a bearing cylinder 72 and a bearing plate 73, wherein the bearing cylinder 72 is mounted on the mounting plate 70 and the output end of the bearing cylinder 72 is connected to a movable plate 74, and the bearing plate 73 is detachably connected to the movable plate 74 for receiving the test weight 23, so that there is a height difference between the top of the suspension bolt 230 connected to the test weight 23 and the seesaw 5.

[0073] like Figure 7As shown, during the process of the outer pressure block 32 and the fixing plate 400 pressing and fixing the inner and outer rings 10 of the bearing 1 respectively, the moving plate 74 and the bearing plate 73 are pushed up by the bearing cylinder 72. The test weight 23 is placed on the bearing plate 73, and its suspension bolt 230 is suspended through the hanging hole 53 of the seesaw 5. Due to the lifting effect of the bearing plate 73, there is a set height difference (e.g., 1–3 mm) between the top of the suspension bolt 230 and the top wall of the seesaw 5, which means that the weight of the weight has not been transmitted to the seesaw 5. At this time, the inner and outer rings 10 of the bearing 1 have not been pressed. The seesaw 5 is supported in a horizontal state by the transition plate 65 until the inner and outer rings 10 of the bearing 1 are pressed and fixed, and the seesaw 5 is adjusted to the correct position. Then the bearing cylinder 72 can descend and tighten the suspension bolt 230, so that the weight of the weight is fully applied to the seesaw 5 through the suspension bolt 230, and the rigidity test officially begins. This design facilitates the automatic loading, unloading, and replacement of weights, avoiding errors or safety hazards caused by manual intervention; at the same time, the lifting and lowering of the bearing plate 73 is controlled by a cylinder to automate the testing process, improving testing efficiency and ease of operation.

[0074] It should be noted that this solution also has a movable reference tray on the frame 2 via a sliding module (slide rail and slider). A bearing 1 that meets the rigidity requirements can be placed on the reference tray for comparison during testing.

[0075] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0077] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A rigidity testing mechanism for crossed roller bearings, characterized in that, It includes the frame, external pressure mechanism, internal pressure mechanism, seesaw, and lifting mechanism; The frame is provided with a detection seat for positioning the outer ring of the bearing, and the external pressure mechanism is located above the detection seat and can press the outer ring of the bearing onto the detection seat; The internal pressure mechanism is mounted on the external pressure mechanism. The internal pressure mechanism includes a connector and a drive disc. A nut seat is mounted on the seesaw. The connector is movably connected to the nut seat and can press and fix the inner ring of the bearing onto the nut seat. The drive disc can switch between the bearing position and the fixed position of the connector. The frame is equipped with a first detection pen and a second detection pen. The first detection pen is in contact with the top wall of one end of the seesaw in a vertical direction, and the second detection pen is in contact with the bottom wall of the other end of the seesaw in a vertical direction. A detection weight is suspended at the end of the seesaw near the first detection pen. The lifting mechanism is used to support the seesaw, and can be disengaged to the underside of the seesaw after the connector is connected to the nut seat, so as to replace the testing weight to test the difference in values ​​between the two testing pens; When the drive disk is in the bearing position, the drive disk can drive the connector to move down synchronously, so that the connector is aligned with the nut seat; When the drive disc switches from the bearing position to the fixed position, the external pressure mechanism presses against the outer ring of the bearing. The drive disc and the connecting member form a clearance in the vertical direction, so that when the drive disc rotates, it can drive the connecting member to be screwed onto the nut seat and pressed against the inner ring of the bearing.

2. The rigidity testing mechanism for crossed roller bearings according to claim 1, characterized in that, The bottom wall of the drive plate is symmetrically provided with bearing blocks. The connecting member includes a fixing plate and a screw. The screw is connected to the bottom wall of the fixing plate and can be screwed onto the nut seat. The fixing plate is symmetrically provided with anti-disengagement blocks. The bearing blocks move against the inner top wall of the anti-disengagement blocks and together form the clearance gap when there is a height difference between them.

3. The rigidity testing mechanism for crossed roller bearings according to claim 2, characterized in that, When the external pressure mechanism presses against the outer ring of the bearing, the travel distance of the fixed plate pressing against the inner ring of the bearing is less than the height difference between the bearing block and the anti-disengagement block.

4. The rigidity testing mechanism for crossed roller bearings according to claim 2, characterized in that, The fixing plate is also provided with an anti-detachment pin located between two adjacent anti-detachment arc blocks.

5. The rigidity testing mechanism for crossed roller bearings according to claim 2, characterized in that, The external pressure mechanism includes: A lifting cylinder is mounted on the frame, and a movable frame is connected to the movable end of the lifting cylinder; Guide slide rails are symmetrically arranged on the frame in the vertical direction. Guide sliders are connected to the side walls of the movable frame. The guide sliders are movably engaged with the guide slide rails. An external pressure block is connected to the bottom wall of the movable frame, and the external pressure block is movably pressed against the outer ring of the bearing.

6. The rigidity testing mechanism for crossed roller bearings according to claim 5, characterized in that, The internal pressure mechanism also includes: A fixed base is installed on the movable frame, and a fixed sleeve is connected to the fixed base; A right-angle reducer and a drive motor are mounted on the fixed sleeve. The input end of the right-angle reducer is connected to the drive motor, and the output end is connected to a rotating shaft via a coupling. The drive disc is sleeved on the bottom of the rotating shaft and is detachably connected to it. Several auxiliary bearings are disposed in the fixed seat and mounted on the rotating shaft. The bottom wall of the fixed seat is connected to a bearing cover plate. A spacer is mounted on the rotating shaft. The bearing cover plate and the spacer are used to limit the displacement of the auxiliary bearings along the axis of the rotating shaft.

7. The rigidity testing mechanism for crossed roller bearings according to claim 1, characterized in that, The detection seat is also equipped with a displacement sensor and a limiting pin. The detection end of the displacement sensor abuts against the side wall of the seesaw. The seesaw has a waist-shaped hole near the end of the second detection pen, and the limiting pin is movably inserted into the waist-shaped hole.

8. The rigidity testing mechanism for crossed roller bearings according to claim 2, characterized in that, The anti-detachment arc block includes a symmetrically arranged arc portion and an arc-shaped extension portion, and the bearing block movably abuts against the arc portion; the arc-shaped extension portion extends outward along the arc direction of the arc portion, and the inner diameter of the arc-shaped extension portion is smaller than the inner diameter of the arc portion.

9. The rigidity testing mechanism for crossed roller bearings according to claim 1, characterized in that, The lifting mechanism includes: A linear bearing housing is mounted on the frame, and a linear bearing is disposed within the linear bearing housing; A lifting cylinder and a support plate are provided. The lifting cylinder is mounted on the support plate, and the output end of the lifting cylinder is connected to the bottom wall of the linear bearing seat. A main shaft is movably connected inside the support plate, and the main shaft is connected to the linear bearing. The transition plate is movably connected to the seesaw via a first positioning pin. Annular protrusions are formed on both axial sides of the transition plate. Annular grooves are provided at the top of both the seesaw and the main shaft. The annular protrusions are movably disposed within the annular grooves, and the annular protrusion at the bottom of the transition plate is movably connected to the main shaft via a second positioning pin.

10. A rigidity testing mechanism for crossed roller bearings according to claim 1, characterized in that, Also includes: The mounting plate is connected to the frame via support columns; The system includes a bearing cylinder and a bearing plate. The bearing cylinder is mounted on the mounting plate, and the output end of the bearing cylinder is connected to a movable plate. The bearing plate is detachably connected to the movable plate and is used to support the test weight, so that there is a height difference between the top of the suspension bolt connected to the test weight and the seesaw.

Images