Machine for measuring precision of inner ring and outer ring of bearing

Abstract

The utility model discloses a machine for precision measurement of an inner ring and an outer ring of a bearing, which relates to the technical field of bearing precision measurement and comprises a bearing inner ring detection box and further comprises a clamping and overturning mechanism arranged inside the bearing inner ring detection box and used for clamping and overturning the bearing. The machine comprises a bearing inner ring detection box, a bearing inner support assembly which is arranged on one side of the bearing inner ring detection box and is used for fixing a bearing outer ring by means of a clamping plate inner support, the machine is provided with a clamping turnover mechanism, and a rotating assembly enables the bearing inner ring to rotate around a specific shaft in the measurement process. The measuring instrument can measure different angles, more comprehensive data can be obtained, measurement blind areas are reduced, the measurement precision is improved, the clamping assembly can stably fix the inner ring and the outer ring of the bearing, shaking or displacement during measurement is prevented, and it is guaranteed that measurement data are accurate and reliable.

Description

Technical Field

[0001] This utility model relates to the field of bearing precision measurement technology, specifically a machine for measuring the precision of the inner and outer rings of bearings. Background Technology

[0002] As a key basic component in mechanical equipment, the performance of bearings directly affects the operating efficiency, stability, and lifespan of the entire machine. The surface roughness of the inner and outer rings of a bearing is one of the important factors determining its performance, as it affects the bearing's coefficient of friction, fatigue life, lubrication effect, and noise level.

[0003] A double-row ball bearing outer ring double raceway testing device, authorized by announcement number CN222560895U, includes a testing instrument with a measuring instrument mounting plate. A column is positioned below the measuring instrument mounting plate. The measuring instrument passes through the bottom of the mounting plate and is connected to a sliding shaft via a retaining ring. A worktable is positioned below the measuring instrument, and a positioning slide is positioned below the worktable. The sliding shaft passes through the positioning slide. A self-lubricating bearing is positioned below the positioning slide, and a fixed testing head is positioned outside the self-lubricating bearing. An upper testing steel ball positioning sleeve is connected to the fixed testing head via a positioning pin. An outer ring is positioned below the upper testing steel ball positioning sleeve, and an upper testing steel ball and a lower testing steel ball are positioned inside the outer ring. A movable testing head is positioned inside the lower testing steel ball. This utility model improves testing accuracy and eliminates errors caused by three-point testing, thereby eliminating the defect of poor clearance after final ball matching due to insufficient testing accuracy.

[0004] As shown in the above equipment, although the existing bearing testing device improves the testing accuracy and eliminates the error caused by three-point testing, thereby eliminating the defect of poor clearance after the final selection and fitting of steel balls due to insufficient testing accuracy, it lacks a rotating component. The device can only measure the inner and outer rings of the bearing from a relatively fixed angle, and cannot comprehensively obtain the accuracy data of different angles. It may miss the dimensional deviations or shape errors of some parts, resulting in inaccurate and incomplete measurement results. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a machine for measuring the precision of the inner and outer rings of bearings, thus solving the problems of existing technologies.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a machine for measuring the accuracy of the inner and outer rings of bearings, comprising a bearing inner ring inspection box, and further comprising:

[0007] A clamping and flipping mechanism is provided inside the bearing inner ring detection box. It is used to clamp and flip the bearing to facilitate the detection device to detect the inner ring of the bearing.

[0008] The bearing inner ring support assembly is located on one side of the bearing inner ring inspection box. It is used to fix the bearing outer ring with the help of the clamping plate inner ring support so that the inspection device can inspect it.

[0009] The clamping and flipping mechanism includes a drive base A, which is disposed on the inner wall of the bearing inner ring detection box. A servo motor is fixedly connected to one end of the drive base A. A mounting frame is disposed on the outer wall of the drive base A. A connecting slide plate is fixedly connected to the bottom end of the mounting frame. A slide rail A is slidably connected to the connecting slide plate. The slide rail A is fixedly installed on the inner wall of the bearing inner ring detection box. A drive base B is fixedly installed on the outer wall of the mounting frame. A drive assembly A is fixedly connected to the top end of the drive base B. A movable slide is disposed on the outer wall of the drive base B. A slide rail B is slidably connected to the outer wall of the movable slide. The slide rail B is fixedly connected to the outer wall of the mounting frame. A rotating assembly is disposed on the outer wall of the movable slide. A clamping assembly is connected to the movable slide through the rotating assembly.

[0010] Preferably, the rotating assembly includes a base plate, which is fixedly installed on the outer wall of the movable slide. A slide rail C is fixedly connected to the outer wall of the base plate, and a toothed ring cover is slidably connected to the outer wall of the slide rail C. A gear meshes with the inner wall of the toothed ring cover, and the gear is rotatably connected to the outer wall of the base plate. A drive motor is fixedly connected to the bottom end of the gear, and a slide groove seat is fixedly connected to the outer wall of the base plate. The inner wall of the slide groove seat is slidably connected to the toothed ring cover.

[0011] Preferably, the clamping assembly includes a housing disposed on one side of the toothed ring cover. A telescopic rod is disposed at one end of the housing. A fixing plate is fixedly connected to one end of the telescopic rod. The fixing plate is fixedly connected to the outer wall of the toothed ring cover. A hinge seat is hinged to one end of the telescopic rod. A trapezoidal push plate is fixedly connected to one end of the hinge seat. Trapezoidal moving plates are slidably connected to both sides of the trapezoidal push plate. A fixing clamp is fixedly connected to the outer wall of the trapezoidal moving plate.

[0012] Preferably, the bearing inner support assembly includes a mounting base, which is disposed on one side of the bearing inner ring inspection box. A placement plate is fixedly connected to the top of the mounting base. A sliding groove is formed on the outer wall of the placement plate. A limiting plate is fixedly installed on the outer wall of the placement plate. A rotating plate is rotatably connected to the inner wall of the mounting base. A rotating shaft is fixedly connected to the bottom end of the rotating plate. A limiting arc groove is formed on the outer wall of the rotating plate. A limiting slide is slidably connected to the inner wall of the limiting arc groove. A sliding clamp is fixedly connected to the top of the limiting slide. The sliding clamp is slidably connected to the inner wall of the sliding groove.

[0013] Preferably, one end of the bearing inner ring testing box is fixedly connected to a connecting column, and the bearing inner ring testing box is connected to the bearing outer ring testing box through the connecting column.

[0014] Preferably, the inner wall of the bearing inner ring testing box is provided with a precision positioning component to ensure the accurate placement of the product under test, with a deviation within 0.1 mm. The inner wall of the bearing inner ring testing box is fixedly connected to a mounting frame, and the outer wall of the mounting frame is provided with a bearing testing device A for precision testing of the bearing inner ring.

[0015] Preferably, a transmission seat is fixedly installed on the inner wall of the bearing outer ring inspection box, a pneumatic rotary table is provided on the outer wall of the transmission seat, a drive assembly B is fixedly connected to the outer wall of the pneumatic rotary table, the output end of the drive assembly B is connected to the rotating shaft, a column is fixedly connected to the outer wall of the pneumatic rotary table, the top end of the column is fixedly connected to the mounting base, a connecting frame is fixedly installed on the inner wall of the bearing outer ring inspection box, a bearing inspection device B is provided on the outer wall of the connecting frame for precision inspection of the bearing outer ring, and an auxiliary positioning frame is fixedly installed on the inner wall of the bearing outer ring inspection box.

[0016] This invention provides a machine for measuring the accuracy of inner and outer rings of bearings. Compared with the prior art, it has the following advantages:

[0017] 1. This machine for measuring the precision of the inner and outer rings of bearings is equipped with a clamping and flipping mechanism. The rotating component allows the inner ring of the bearing to rotate around a specific axis during the measurement process. The measuring instrument can measure it at different angles to obtain more comprehensive data, reduce measurement blind spots, and improve measurement accuracy. The clamping component can firmly fix the inner and outer rings of the bearing to prevent shaking or displacement during measurement and ensure accurate and reliable measurement data.

[0018] 2. This machine for measuring the precision of the inner and outer rings of bearings is equipped with an inner bearing support assembly. The inner bearing support assembly provides uniform and stable support force from inside the outer ring of the bearing, preventing the outer ring from deforming due to gravity or external forces during measurement. This ensures that the measurement results can accurately reflect the actual precision of the outer ring, and at the same time, it can accurately determine the center position of the outer ring of the bearing, so that the relative position of the measuring instrument and the outer ring remains fixed and accurate, reducing positioning errors and improving the repeatability and accuracy of the measurement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the clamping and flipping mechanism of this utility model;

[0021] Figure 3 This is a schematic diagram of the rotating component of this utility model;

[0022] Figure 4 This is a schematic diagram of the clamping component of this utility model;

[0023] Figure 5This is a schematic diagram of the bearing inner clamping assembly of this utility model;

[0024] Figure 6 This is a cross-sectional view of the bearing inner clamping assembly of this utility model.

[0025] In the diagram: 1. Bearing inner ring inspection box; 2. Connecting column; 3. Bearing outer ring inspection box; 4. Precision positioning assembly; 5. Mounting bracket; 6. Clamping and flipping mechanism; 61. Drive seat A; 62. Slide rail A; 63. Connecting slide plate; 64. Mounting frame; 65. Drive seat B; 66. Movable slide; 67. Rotating assembly; 671. Base plate; 672. Slide rail C; 673. Gear; 674. Drive motor; 675. Motor; 676. Gear ring cover; 68. Clamping assembly; 681. Housing; 682. Telescopic rod; 6 83. Hinge seat; 684. Trapezoidal moving plate; 685. Trapezoidal push plate; 686. Fixed clamp plate; 687. Fixed plate; 69. Slide rail B; 610. Drive assembly A; 7. Bearing detection device A; 8. Transmission seat; 9. Bearing inner support assembly; 91. Mounting seat; 92. Placement plate; 93. Slide groove; 94. Limiting plate; 95. Rotating plate; 96. Limiting arc groove; 97. Limiting slide seat; 98. Sliding clamp seat; 10. Pneumatic rotary table; 11. Connecting frame; 12. Bearing detection device B; 13. Auxiliary positioning frame. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] See Figures 1-6 This utility model provides the following two technical solutions:

[0028] First implementation: A machine for measuring the accuracy of the inner and outer rings of a bearing, including a bearing inner ring inspection box 1, and further comprising:

[0029] The clamping and flipping mechanism 6 is located inside the bearing inner ring inspection box 1 and is used to clamp and flip the bearing to facilitate the inspection device to inspect the inner ring of the bearing.

[0030] The bearing inner support assembly 9 is located on one side of the bearing inner ring inspection box 1 and is used to fix the bearing outer ring with the help of the clamping plate inner support so that the inspection device can inspect it.

[0031] The inner wall of the bearing inner ring inspection box 1 is equipped with a precision positioning component 4 to ensure the accurate placement of the product to be tested, with a deviation within 0.1 mm. The inner wall of the bearing inner ring inspection box 1 is fixedly connected with a mounting bracket 5, and the outer wall of the mounting bracket 5 is equipped with a bearing inspection device A7 for the precision inspection of the bearing inner ring.

[0032] The clamping and flipping mechanism 6 includes a drive base A61, which is disposed on the inner wall of the bearing inner ring detection box 1. A servo motor is fixedly connected to one end of the drive base A61. A mounting frame 64 is disposed on the outer wall of the drive base A61. A connecting slide plate 63 is fixedly connected to the bottom end of the mounting frame 64. A slide rail A62 is slidably connected to the connecting slide plate 63. The slide rail A62 is fixedly installed on the inner wall of the bearing inner ring detection box 1. A drive base B65 is fixedly installed on the outer wall of the mounting frame 64. A drive assembly A610 is fixedly connected to the top end of the drive base B65. A movable slide 66 is disposed on the outer wall of the drive base B65. A slide rail B69 is slidably connected to the outer wall of the movable slide 66. The slide rail B69 is fixedly connected to the outer wall of the mounting frame 64. A rotating assembly 67 is disposed on the outer wall of the movable slide 66. A clamping assembly 68 is connected to the movable slide 66 through the rotating assembly 67.

[0033] The rotating assembly 67 includes a base plate 671, which is fixedly installed on the outer wall of the movable slide 66. A slide rail C672 is fixedly connected to the outer wall of the base plate 671. A toothed ring cover 676 is slidably connected to the outer wall of the slide rail C672. A gear 673 is meshed with the inner wall of the toothed ring cover 676. The gear 673 is rotatably connected to the outer wall of the base plate 671. A drive motor 674 is fixedly connected to the bottom end of the gear 673. A slide groove seat 675 is fixedly connected to the outer wall of the base plate 671. The inner wall of the slide groove seat 675 is slidably connected to the toothed ring cover 676.

[0034] The clamping assembly 68 includes a housing 681, which is disposed on one side of the toothed ring cover 676. A telescopic rod 682 is provided at one end of the housing 681. A fixing plate 687 is fixedly connected to one end of the telescopic rod 682. The fixing plate 687 is fixedly connected to the outer wall of the toothed ring cover 676. A hinge seat 683 is hinged to one end of the telescopic rod 682. A trapezoidal push plate 685 is fixedly connected to one end of the hinge seat 683. Trapezoidal moving plates 684 are slidably connected to both sides of the trapezoidal push plate 685. A fixing clamping plate 686 is fixedly connected to the outer wall of the trapezoidal moving plate 684.

[0035] The machine for measuring the accuracy of the inner and outer rings of bearings is equipped with a clamping and flipping mechanism 6. The rotating component 67 allows the inner ring of the bearing to rotate around a specific axis during the measurement process. The measuring instrument can measure it at different angles to obtain more comprehensive data, reduce measurement blind spots, and improve measurement accuracy. Meanwhile, the clamping component 68 can firmly fix the inner and outer rings of the bearing to prevent shaking or displacement during measurement and ensure that the measurement data is accurate and reliable.

[0036] The second implementation method differs from the first implementation method in that: a connecting column 2 is fixedly connected to one end of the bearing inner ring detection box 1, and the bearing outer ring detection box 3 is connected to the bearing inner ring detection box 1 through the connecting column 2.

[0037] A transmission seat 8 is fixedly installed on the inner wall of the bearing outer ring inspection box 3. A pneumatic rotary table 10 is provided on the outer wall of the transmission seat 8. A drive component B is fixedly connected to the outer wall of the pneumatic rotary table 10. The output end of the drive component B is connected to the rotating shaft. A column is fixedly connected to the outer wall of the pneumatic rotary table 10. The top of the column is fixedly connected to the mounting seat 91. A connecting frame 11 is fixedly installed on the inner wall of the bearing outer ring inspection box 3. A bearing inspection device B12 is provided on the outer wall of the connecting frame 11 for the accuracy inspection of the bearing outer ring. An auxiliary positioning frame 13 is fixedly installed on the inner wall of the bearing outer ring inspection box 3.

[0038] The bearing inner support assembly 9 includes a mounting base 91, which is located on one side of the bearing inner ring inspection box 1. A placement plate 92 is fixedly connected to the top of the mounting base 91. A sliding groove 93 is provided on the outer wall of the placement plate 92. A limiting plate 94 is fixedly installed on the outer wall of the placement plate 92. A rotating plate 95 is rotatably connected to the inner wall of the mounting base 91. A rotating shaft is fixedly connected to the bottom of the rotating plate 95. A limiting arc groove 96 is provided on the outer wall of the rotating plate 95. A limiting slide 97 is slidably connected to the inner wall of the limiting arc groove 96. A sliding clamp 98 is fixedly connected to the top of the limiting slide 97. The sliding clamp 98 is slidably connected to the inner wall of the sliding groove 93.

[0039] The machine for measuring the precision of the inner and outer rings of bearings is equipped with a bearing inner support assembly 9. The bearing inner support assembly 9 provides uniform and stable support force from inside the bearing outer ring, preventing the outer ring from deforming due to gravity or external forces during measurement. This ensures that the measurement results can accurately reflect the actual precision of the outer ring, and at the same time, it can accurately determine the center position of the bearing outer ring, keeping the relative position of the measuring instrument and the outer ring fixed and accurate, reducing positioning errors, and improving the repeatability and accuracy of the measurement.

[0040] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used.

[0041] When the robot places the bearing into the precision positioning component 4 through the handling and clamping, and adjusts its position by rotating the precision positioning component 4, the drive component A610 drives the drive seat A61 to move, causing the movable carriage 66 to move downward. As it moves, when the bearing is located between the two fixed clamping plates 686, the telescopic rod 682 extends and retracts, causing the hinge seat 683 to move. The movement of the hinge seat 683 causes the trapezoidal push plate 685 to move. The inward movement of the trapezoidal push plate 685 causes its two ends to slide. The trapezoidal moving plate 684 moves inward, and the inward movement of the two trapezoidal moving plates 684 drives the two fixed clamping plates 686 to move inward, thereby fixing and clamping the spline sleeve. After the bearing is stably clamped, it moves upward through the movable slide 66, and after moving to the detection range of the bearing detection device A7, the drive motor 674 drives the gear 673 to rotate. The rotation of the gear 673 drives the toothed ring cover 676 meshing on its outer wall to slide and rotate on the slide rail C672. 6. Sliding rotation drives the clamped bearing to rotate. Then, the bearing detection device A7 can perform multi-angle precise detection of the bearing inner ring. After the inner ring is detected, the bearing is placed on the outer wall of the placement plate 92 by the robot transport and with the assistance of the auxiliary positioning frame 13 and the limiting clamp of the limiting plate 94. Then, the drive component B is started to drive the rotating shaft to rotate, which in turn drives the rotating plate 95 to rotate. The rotation of the rotating plate 95 causes the limiting slide 97 to slide in the limiting arc groove 96. The gradual sliding of the limiting slide 97 in the limiting arc groove 96 drives the sliding clamp 98 connected to its top to gradually move outward in the sliding groove of the inner wall of the groove plate 93. The gradual outward movement of the two sliding clamps 98 can internally support and fix the bearing. After fixing, the transmission seat 8 operates to drive the pneumatic rotary table 10 to move. When it moves to the detection range of the bearing detection device B12, it stops moving. Then, the pneumatic rotary table 10 rotates, which facilitates the bearing detection device B12 to perform precise detection of the bearing outer ring.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A machine for measuring the accuracy of inner and outer rings of bearings, comprising a bearing inner ring inspection box (1), characterized in that, Also includes: The clamping and flipping mechanism (6) is located inside the bearing inner ring detection box (1) and is used to clamp and flip the bearing so that the detection device can detect the inner ring of the bearing. The bearing inner support assembly (9) is located on one side of the bearing inner ring inspection box (1) and is used to fix the bearing outer ring with the help of the clamping plate inner support so that the inspection device can inspect it. The clamping and flipping mechanism (6) includes a drive base A (61), which is disposed on the inner wall of the bearing inner ring detection box (1). A servo motor is fixedly connected to one end of the drive base A (61). A mounting frame (64) is provided on the outer wall of the drive base A (61). A connecting slide plate (63) is fixedly connected to the bottom end of the mounting frame (64). A slide rail A (62) is slidably connected to the connecting slide plate (63). The slide rail A (62) is fixedly installed on the inner wall of the bearing inner ring detection box (1). 4) A drive seat B (65) is fixedly installed on the outer wall. A drive assembly A (610) is fixedly connected to the top of the drive seat B (65). A movable slide (66) is provided on the outer wall of the drive seat B (65). A slide rail B (69) is slidably connected to the outer wall of the movable slide (66). The slide rail B (69) is fixedly connected to the outer wall of the mounting frame (64). A rotating assembly (67) is provided on the outer wall of the movable slide (66). The movable slide (66) is connected to a clamping assembly (68) through the rotating assembly (67).

2. The machine for measuring the accuracy of inner and outer rings of bearings according to claim 1, characterized in that: The rotating assembly (67) includes a base plate (671), which is fixedly installed on the outer wall of the movable slide (66). A slide rail C (672) is fixedly connected to the outer wall of the base plate (671). A toothed ring cover (676) is slidably connected to the outer wall of the slide rail C (672). A gear (673) meshes with the inner wall of the toothed ring cover (676). The gear (673) is rotatably connected to the outer wall of the base plate (671). A drive motor (674) is fixedly connected to the bottom end of the gear (673). A slide groove seat (675) is fixedly connected to the outer wall of the base plate (671). The inner wall of the slide groove seat (675) is slidably connected to the toothed ring cover (676).

3. The machine for measuring the accuracy of inner and outer rings of bearings according to claim 1, characterized in that: The clamping assembly (68) includes a housing (681) disposed on one side of the toothed ring cover (676). A telescopic rod (682) is provided at one end of the housing (681). A fixing plate (687) is fixedly connected to one end of the telescopic rod (682). The fixing plate (687) is fixedly connected to the outer wall of the toothed ring cover (676). A hinge seat (683) is hinged to one end of the telescopic rod (682). A trapezoidal push plate (685) is fixedly connected to one end of the hinge seat (683). A trapezoidal moving plate (684) is slidably connected to both sides of the trapezoidal push plate (685). A fixing clamping plate (686) is fixedly connected to the outer wall of the trapezoidal moving plate (684).

4. The machine for measuring the accuracy of inner and outer rings of bearings according to claim 1, characterized in that: The bearing inner support assembly (9) includes a mounting base (91), which is located on one side of the bearing inner ring inspection box (1). A placement plate (92) is fixedly connected to the top of the mounting base (91). A sliding groove (93) is provided on the outer wall of the placement plate (92). A limiting plate (94) is fixedly installed on the outer wall of the placement plate (92). A rotating plate (95) is rotatably connected to the inner wall of the mounting base (91). A rotating shaft is fixedly connected to the bottom end of the rotating plate (95). A limiting arc groove (96) is provided on the outer wall of the rotating plate (95). A limiting slide (97) is slidably connected to the inner wall of the limiting arc groove (96). A sliding clamp (98) is fixedly connected to the top of the limiting slide (97). The sliding clamp (98) is slidably connected to the inner wall of the sliding groove (93).

5. A machine for measuring the accuracy of inner and outer rings of bearings according to claim 1, characterized in that: One end of the bearing inner ring inspection box (1) is fixedly connected to a connecting column (2), and the bearing inner ring inspection box (1) is connected to the bearing outer ring inspection box (3) through the connecting column (2).

6. A machine for measuring the accuracy of inner and outer rings of bearings according to claim 1, characterized in that: The inner wall of the bearing inner ring inspection box (1) is provided with a precision positioning component (4) to ensure the accuracy of the placement of the product to be tested, with a deviation within 0.1 mm. The inner wall of the bearing inner ring inspection box (1) is fixedly connected with a mounting bracket (5), and the outer wall of the mounting bracket (5) is provided with a bearing inspection device A (7) for the precision inspection of the bearing inner ring.

7. A machine for measuring the accuracy of inner and outer rings of bearings according to claim 5, characterized in that: The inner wall of the bearing outer ring inspection box (3) is fixedly installed with a transmission seat (8). The outer wall of the transmission seat (8) is provided with a pneumatic rotary table (10). The outer wall of the pneumatic rotary table (10) is fixedly connected with a drive component B. The output end of the drive component B is connected to the rotating shaft. The outer wall of the pneumatic rotary table (10) is fixedly connected with a column. The top of the column is fixedly connected to a mounting seat (91). The inner wall of the bearing outer ring inspection box (3) is fixedly installed with a connecting frame (11). The outer wall of the connecting frame (11) is provided with a bearing inspection device B (12) for the accuracy inspection of the bearing outer ring. The inner wall of the bearing outer ring inspection box (3) is fixedly installed with an auxiliary positioning frame (13).

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