A high-precision long-cylinder double-row angular contact ball bearing axial clearance detection device

Abstract

A high-precision, long-cylinder, double-row angular contact ball bearing axial clearance detection device relates to the field of bearing testing technology. This device addresses the problem of existing clearance measuring instruments causing wear on the bearing raceways and rolling elements during use, as well as translational and angular deviation between the inner and outer ring axes during measurement, leading to errors in the measured values. This bearing clearance detection device uses a concentric shaft to secure the bearing inner ring to a core shaft, positioning the two inner rings concentrically based on the bearing inner diameter. This prevents translational and angular deviation between the inner and outer ring axes during measurement, thereby improving measurement accuracy. A torque wrench is then used to tighten the screw, thereby axially securing the bearing inner ring. The bearing outer ring is then axially tightened using end-face positioning at 120° intervals, securing it between the upper cover and the main shaft. This device eliminates wear on the bearing raceways and outer surfaces of the rolling elements during testing. The present invention is suitable for detecting bearing axial clearance.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing detection, in particular to a high-precision long-cylinder double-row angular contact ball bearing axial clearance detection device. Background Art

[0002] Currently, the domestic industry typically uses the X194 axial clearance measuring instrument to test the axial clearance of double-row angular contact ball bearings. This testing method involves fixing the outer ring of the bearing and applying a vertical upward and downward load to the inner ring, causing it to move from one extreme position to the other. The displacement of the inner ring is then read as the bearing axial clearance value. This testing method has the following shortcomings: First, the lever loading method of the X194 clearance measuring instrument can cause impact marks on the bearing raceway and steel ball surface. Second, due to the inherent structure of double-row angular contact ball bearings after loading, the inner ring axis and outer ring axis will experience translational and angular deviation when the X194 axial clearance measurement is used. For bearings with an inner ring width of up to 70mm, the distortion value generated during bearing clearance measurement is greater.

[0003] In summary, existing clearance measuring instruments will cause severe wear on the outer surfaces of the bearing raceways and rolling elements during bearing testing. In addition, the inner ring axis and the outer ring axis will produce translational and angular deviation during the measurement process, resulting in large errors in the detected values. Summary of the Invention

[0004] The present invention aims to solve the problem that existing clearance measuring instruments will cause serious wear to the outer surfaces of the bearing raceways and rolling elements during the bearing detection process, and that the inner ring axis and the outer ring axis will produce translational and angular deviation during the measurement process, resulting in large errors in the detected values. A high-precision long-cylinder double-row angular contact ball bearing axial clearance detection device is proposed.

[0005] The present invention discloses a high-precision, long-tube, double-row angular contact ball bearing axial clearance detection device, which comprises a sensor 1, a screw 2, a spacer 3, a core shaft 4, a locking screw 7, an upper cover 8, a main shaft 9, a marble horizontal platform 10, a motor 11, a driving pulley 12, a belt 13, a cylinder 14, a driven pulley 15, a cylindrical roller bearing 16, a sleeve 17, an adjustment arm 18, a locking bolt 19, a column 20, and a frame 21.

[0006] A marble horizontal platform 10 is provided at the top of the frame 21, and a through hole is machined in the center of the upper surface of the marble horizontal platform 10, and a sleeve 17 is embedded in the through hole. The bottom of the main shaft 9 is inserted into the interior of the sleeve 17, and a cylindrical roller bearing 16 is provided between the outer surface of the main shaft 9 and the inner wall of the sleeve 17. A circular through hole is machined at the bottom end face of the main shaft 9, and a cylinder 14 is embedded in the through hole. A concave limit block is provided at the top of the output end of the cylinder 14, and a circular boss is machined at the lower part of the outer surface of the core shaft 4, and the bottom end of the core shaft 4 is inserted into the interior of the blind hole on the upper surface of the concave limit block. A threaded through hole is machined at the center of the top end face of the core shaft 4, and a through hole is machined at the bottom of the countersunk hole of the concave limit block. The bottom end of the screw 2 passes through the pad 3, the threaded through hole on the end face of the core shaft 4 and the through hole on the concave limit block in sequence, and contacts with the output end of the cylinder 14. The upper surface of the main shaft 9 is locked by the locking screw 7 Connected to the upper cover sleeve 8, one end of the upper surface of the marble horizontal platform 10 is provided with a through hole, and a motor 11 is embedded in the through hole. A driving pulley 12 is provided on the output end of the motor 11, and a driven pulley 15 is provided at the bottom of the main shaft 9, and the inner ring of the driven pulley 15 is fixedly connected to the outer surface of the main shaft 9. The driven pulley 15 is connected to the driving pulley 12 through a belt 13. A column 20 is provided at the other end of the upper surface of the marble horizontal platform 10, and a plurality of grooves are uniformly provided on the outer surface of the column 20 along the length direction. One end of the upper surface of the adjusting arm 18 is sleeved on the column 20, and a threaded hole is provided on the end surface of the adjusting arm 18. A locking bolt 19 is provided inside the threaded hole, and the end face of the locking bolt 19 is inserted into one of the grooves on the outer surface of the column 20. A sensor 1 is provided at the other end of the adjusting arm 18, and the bottom end of the sensor 1 contacts the top end face of the screw 2;

[0007] Furthermore, the bottom of the motor 11 is fixedly connected to the middle portion of the lower surface of the baffle 22 via a motor base;

[0008] Furthermore, the cross-sectional area of ​​the through hole at one end of the upper surface of the marble horizontal platform 10 is smaller than the area of ​​the baffle 22;

[0009] Furthermore, the baffle 22 is fixedly connected to the marble horizontal platform 10 by bolts;

[0010] Furthermore, the upper cover 8 is in the shape of a cylinder with one end closed and the other end open and having an inner cavity, and a through hole is provided at the center of the closed end surface of the upper cover 8;

[0011] Furthermore, the core shaft 4 is arranged in the inner cavity of the upper cover 8;

[0012] Furthermore, the bottom of the column 20 is evenly provided with three triangular support plates along the circumferential direction;

[0013] Furthermore, the triangular support plate is fixedly connected to the upper surface of the marble horizontal platform 10 by bolts;

[0014] Furthermore, the upright column 20 is integrally provided with the triangular support plate;

[0015] Furthermore, the diameter of the driving pulley 12 is smaller than the diameter of the driven pulley 15;

[0016] Furthermore, when in use, the inner ring 5 of the bearing to be tested is sleeved on the outer surface of the core shaft 4, and then the bottom of the screw 2 is passed through the spacer 2 and screwed into the inside of the threaded through hole on the core shaft 4. After the bottom of the screw 2 passes through the through hole on the concave limit block, it contacts the output end of the cylinder 14, and the upper surface of the outer ring 6 of the bearing contacts the top of the inner cavity of the upper cover sleeve 8, and the lower surface of the outer ring 6 of the bearing contacts the upper surface of the main shaft 9, and then the outer ring 6 of the bearing is clamped by the upper cover sleeve 8 and the main shaft 9; finally, the upper cover sleeve 8 is fixed to the upper surface of the main shaft 9 by the locking screw 7, and the height of the adjustment arm 18 is adjusted to an appropriate position so that the bottom of the sensor 1 contacts the top of the screw 2;

[0017] Start the motor 11, which drives the driving pulley 12 to rotate. The bottom of the main shaft 9 is provided with a driven pulley 15, and the inner ring of the driven pulley 15 is fixedly connected to the outer surface of the main shaft 9. The driven pulley 15 is connected to the driving pulley 12 through the belt 13; the driving pulley 12 drives the driven pulley 15 to rotate through the pulley, thereby driving the main shaft 9 to rotate, thereby driving the outer ring 6 of the bearing to rotate continuously, and starting the cylinder 14 so that the output end of the cylinder 14 extends, thereby applying vertical upward pressure to the inner ring 5 of the bearing; then use the sensor 1 to measure the axial looseness of the bearing. The gap size is monitored to complete the detection of the bearing axial clearance. Using this bearing clearance detection device, the bearing inner ring is fixed to the core shaft using a concentric shaft method. The two inner rings are positioned concentrically based on the bearing inner diameter, avoiding translation and angular deviation between the inner ring axis and the outer ring axis during the measurement process, thereby greatly improving the measurement accuracy. A torque wrench is used to tighten the screw to axially tighten the bearing inner ring. The bearing outer ring is axially tightened in 120° equal sections using end face positioning to fix the bearing outer ring between the upper cover and the main shaft. During the detection process, no wear is caused to the outer surfaces of the bearing raceway and rolling elements.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention overcomes the shortcomings of the prior art. This bearing clearance detection device utilizes a concentric shaft arrangement to secure the bearing inner ring to the mandrel. Positioning the two inner rings concentrically using the bearing inner diameter prevents translational and angular deviation between the inner and outer ring axes during measurement, thereby significantly improving measurement accuracy. A torque wrench is used to tighten the screw, thereby axially securing the bearing inner ring. The bearing outer ring is then axially secured by end-face positioning at 120° intervals, securing it between the upper cover and the main shaft. This eliminates wear on the outer surfaces of the bearing raceways and rolling elements during the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of a high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to the present invention;

[0021] Figure 2 This is a graph showing the overall height of the inner ring of a bearing being tested obtained using the high-precision long-tube double-row angular contact ball bearing axial clearance detection device of the present invention;

[0022] Figure 3 A graph showing the groove distance value of the inner ring of the tested bearing obtained by using the high-precision long-tube double-row angular contact ball bearing axial clearance detection device of the present invention;

[0023] Figure 4 A high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to the present invention is used to obtain a curve diagram of the average clearance value of the measured bearing. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figure 1 This embodiment describes a high-precision, long-tube, double-row angular contact ball bearing axial clearance detection device, which specifically includes a sensor 1, a screw 2, a spacer 3, a core shaft 4, a locking screw 7, an upper cover 8, a main shaft 9, a marble horizontal platform 10, a motor 11, a driving pulley 12, a belt 13, a cylinder 14, a driven pulley 15, a cylindrical roller bearing 16, a sleeve 17, an adjustment arm 18, a locking bolt 19, a column 20, and a frame 21.

[0025] A marble horizontal platform 10 is provided at the top of the frame 21, and a through hole is machined in the center of the upper surface of the marble horizontal platform 10, and a sleeve 17 is embedded in the through hole. The bottom of the main shaft 9 is inserted into the interior of the sleeve 17, and a cylindrical roller bearing 16 is provided between the outer surface of the main shaft 9 and the inner wall of the sleeve 17. A circular through hole is machined at the bottom end face of the main shaft 9, and a cylinder 14 is embedded in the through hole. A concave limit block is provided at the top of the output end of the cylinder 14, and a circular boss is machined at the lower part of the outer surface of the core shaft 4, and the bottom end of the core shaft 4 is inserted into the interior of the blind hole on the upper surface of the concave limit block. A threaded through hole is machined at the center of the top end face of the core shaft 4, and a through hole is machined at the bottom of the countersunk hole of the concave limit block. The bottom end of the screw 2 passes through the pad 3, the threaded through hole on the end face of the core shaft 4 and the through hole on the concave limit block in sequence, and contacts with the output end of the cylinder 14. The upper surface of the main shaft 9 is locked by the locking screw 7 Connected to the upper cover sleeve 8, one end of the upper surface of the marble horizontal platform 10 is provided with a through hole, and a motor 11 is embedded in the through hole. A driving pulley 12 is provided on the output end of the motor 11, and a driven pulley 15 is provided at the bottom of the main shaft 9, and the inner ring of the driven pulley 15 is fixedly connected to the outer surface of the main shaft 9. The driven pulley 15 is connected to the driving pulley 12 through a belt 13. A column 20 is provided at the other end of the upper surface of the marble horizontal platform 10, and a plurality of grooves are uniformly provided on the outer surface of the column 20 along the length direction. One end of the upper surface of the adjusting arm 18 is sleeved on the column 20, and a threaded hole is provided on the end surface of the adjusting arm 18. A locking bolt 19 is provided inside the threaded hole, and the end face of the locking bolt 19 is inserted into one of the grooves on the outer surface of the column 20. A sensor 1 is provided at the other end of the adjusting arm 18, and the bottom end of the sensor 1 contacts the top end face of the screw 2;

[0026] In this specific embodiment, when in use, the inner ring 5 of the bearing to be tested is sleeved on the outer surface of the core shaft 4, and then the bottom of the screw 2 is passed through the spacer 2 and screwed into the inside of the threaded through hole on the core shaft 4. After the bottom of the screw 2 passes through the through hole on the concave limit block, it contacts the output end of the cylinder 14, and the upper surface of the outer ring 6 of the bearing contacts the top of the inner cavity of the upper cover sleeve 8, and the lower surface of the outer ring 6 of the bearing contacts the upper surface of the main shaft 9, and then the outer ring 6 of the bearing is clamped by the upper cover sleeve 8 and the main shaft 9; finally, the upper cover sleeve 8 is fixed to the upper surface of the main shaft 9 by the locking screw 7, and the height of the adjustment arm 18 is adjusted to an appropriate position so that the bottom of the sensor 1 contacts the top of the screw 2;

[0027] Start the motor 11, which drives the driving pulley 12 to rotate. The bottom of the main shaft 9 is provided with a driven pulley 15, and the inner ring of the driven pulley 15 is fixedly connected to the outer surface of the main shaft 9. The driven pulley 15 is connected to the driving pulley 12 through the belt 13; the driving pulley 12 drives the driven pulley 15 to rotate through the pulley, thereby driving the main shaft 9 to rotate, thereby driving the outer ring 6 of the bearing to rotate continuously, and starting the cylinder 14 so that the output end of the cylinder 14 extends, thereby applying vertical upward pressure to the inner ring 5 of the bearing; then use the sensor 1 to measure the axial looseness of the bearing. The gap size is monitored to complete the detection of the bearing axial clearance. Using this bearing clearance detection device, the bearing inner ring is fixed to the core shaft using a concentric shaft method. The two inner rings are positioned concentrically based on the bearing inner diameter, avoiding translation and angular deviation between the inner ring axis and the outer ring axis during the measurement process, thereby greatly improving the measurement accuracy. A torque wrench is used to tighten the screw to axially tighten the bearing inner ring. The bearing outer ring is axially tightened in 120° equal sections using end face positioning to fix the bearing outer ring between the upper cover and the main shaft. During the detection process, no wear is caused to the outer surfaces of the bearing raceway and rolling elements.

[0028] Specific implementation method 2: Combination Figure 1 This embodiment is described as a further limitation of the bearing axial clearance detection device described in the first embodiment. This embodiment describes a high-precision long-cylinder double-row angular contact ball bearing axial clearance detection device, in which the bottom of the motor 11 is fixedly connected to the middle of the lower surface of the baffle 22 through the motor seat.

[0029] Specific implementation method three: Combination Figure 1 This embodiment further defines the bearing axial clearance detection device described in the second embodiment. This embodiment describes a high-precision, long-tube, double-row angular contact ball bearing axial clearance detection device. The cross-sectional area of ​​the through hole at one end of the upper surface of the marble horizontal platform 10 is smaller than the area of ​​the baffle 22.

[0030] In this specific embodiment, the cross-sectional area of ​​the through hole at one end of the upper surface of the marble horizontal platform 10 is smaller than the area of ​​the baffle 22, and the bottom of the motor 11 is fixedly connected to the middle part of the lower surface of the baffle 22 through the motor seat, thereby fixing the motor 11 inside the through hole at one end of the upper surface of the marble horizontal platform 10.

[0031] Specific implementation method four: Combination Figure 1 This embodiment is described as a further limitation of the bearing axial clearance detection device described in the third embodiment. This embodiment describes a high-precision long-cylinder double-row angular contact ball bearing axial clearance detection device, in which the baffle 22 is fixedly connected to the marble horizontal platform 10 by bolts.

[0032] Specific implementation method five: Combination Figure 1 This embodiment is described as a further limitation of the bearing axial clearance detection device described in the first embodiment. This embodiment describes a high-precision long-tube double-row angular contact ball bearing axial clearance detection device, wherein the upper cover sleeve 8 is a cylindrical body with one end closed and the other end open and having an inner cavity, and a through hole is provided in the center of the closed end surface of the upper cover sleeve 8;

[0033] In this specific embodiment, the upper cover sleeve 8 is a cylindrical body with an inner cavity that is closed at one end and open at the other end, and a through hole is provided at the center of the closed end face of the upper cover sleeve 8. The inner diameter of the through hole of the closed end face of the upper cover sleeve 8 should be smaller than the diameter of the outer ring of the bearing to be measured, so that the inner edge of the through hole of the closed end face of the upper cover sleeve 8 and the upper surface of the main shaft 9 can be used to axially clamp the outer ring of the bearing.

[0034] Specific implementation method six: combination Figure 1 This embodiment is described as a further limitation of the bearing axial clearance detection device described in the fifth embodiment. This embodiment describes a high-precision long-cylinder double-row angular contact ball bearing axial clearance detection device, in which the core shaft 4 is arranged in the inner cavity of the upper cover sleeve 8.

[0035] Specific implementation method seven: combination Figure 1 This embodiment further defines the bearing axial clearance detection device described in the first embodiment. This embodiment further defines a high-precision, long-tube, double-row angular contact ball bearing axial clearance detection device. The bottom of the column 20 is provided with three triangular support plates evenly spaced along the circumferential direction.

[0036] In this specific embodiment, three triangular support plates are evenly arranged at the bottom of the column 20 along the circumferential direction to improve the stability of the device in use.

[0037] Specific implementation method eight: combination Figure 1 This embodiment is described as a further limitation of the bearing axial clearance detection device described in Specific Embodiment 7. This embodiment describes a high-precision long-cylinder double-row angular contact ball bearing axial clearance detection device, in which the triangular support plate is fixedly connected to the upper surface of the marble horizontal platform 10 by bolts.

[0038] Specific implementation method nine: Combination Figure 1 This embodiment is described as a further limitation of the bearing axial clearance detection device described in the seventh embodiment. This embodiment describes a high-precision long-tube double-row angular contact ball bearing axial clearance detection device, in which the column 20 is integrally arranged with the triangular support plate.

[0039] Specific implementation method ten: Combination Figure 1 This embodiment is described as further limiting the bearing axial clearance detection device described in the first embodiment. In this embodiment, a high-precision long-tube double-row angular contact ball bearing axial clearance detection device is described, wherein the diameter of the driving pulley 12 is smaller than the diameter of the driven pulley 15.

[0040] In this specific embodiment, the diameter of the driving pulley 12 is smaller than the diameter of the driven pulley 15 to ensure that the main shaft 9 rotates at a low speed.

[0041] Specific implementation method 11: Combination Figures 1 to 4 This embodiment is described. This embodiment is a further limitation of the bearing axial clearance detection device described in the specific embodiment 1. The high-precision long-tube double-row angular contact ball bearing axial clearance detection device described in this embodiment has a specific axial clearance detection process: first, the bearing to be tested is installed on the bearing axial clearance detection device, and the modeling simulation is compared with the measured results. In terms of the tightening torque of the bearing inner ring, the preload force is set to 5N·m to axially tighten the inner ring, and the preload force is gradually increased by 2N·m to detect the overall height and groove spacing values ​​respectively to obtain a change curve (such as Figure 2 and Figure 3 );

[0042] Measured data and trend chart analysis show that increasing the inner ring preload from 5 N·m to 15 N·m reduces the groove spacing by 0.002mm, remaining constant thereafter. However, the overall height decreases by 0.018mm when increasing the preload from 5 N·m to 19 N·m, remaining constant thereafter. Analysis indicates that the change in groove spacing is due to the gap between the two inner rings, while the change in overall height is due to the gaps between the mating surfaces, the mandrel step, and the elastic deformation of the gasket. Therefore, a tightening torque of 15 N·m is selected as the inner ring preload for clearance testing.

[0043] Similarly, a tightening torque is applied to the outer ring of the bearing and the torque is increased layer by layer to obtain a curve of the bearing clearance detection test value (such as Figure 4 );

[0044] Measured data and trend chart analysis show that within the clearance range of 3 to 9 N·m, the maximum difference in clearance is 0.7 μm, and the average difference is 0.4 μm. However, when the preload force increases to 11 N·m, the average clearance value increases by 1.9 μm. Subsequently, the rate of increase in the average clearance value gradually slows as the preload force increases. This indicates that the outer ring undergoes elastic deformation under high preload, reducing the outer ring groove spacing and thus increasing the average clearance value. Based on these test results, a 9 N·m outer ring preload force is the preferred outer ring preload force for clearance testing.

[0045] How it works

[0046] During use, the inner ring 5 of the bearing to be tested is sleeved on the outer surface of the core shaft 4, and then the bottom of the screw 2 is passed through the spacer 2 and screwed into the inside of the threaded through hole on the core shaft 4. After the bottom of the screw 2 passes through the through hole on the concave limit block, it contacts the output end of the cylinder 14, and the upper surface of the outer ring 6 of the bearing contacts the top of the inner cavity of the upper cover sleeve 8, and the lower surface of the outer ring 6 of the bearing contacts the upper surface of the main shaft 9, and then the outer ring 6 of the bearing is clamped by the upper cover sleeve 8 and the main shaft 9; finally, the upper cover sleeve 8 is fixed to the upper surface of the main shaft 9 by the locking screw 7, and the height of the adjusting arm 18 is adjusted to an appropriate position so that the bottom of the sensor 1 contacts the top of the screw 2;

[0047] Start the motor 11, which drives the driving pulley 12 to rotate. The bottom of the main shaft 9 is provided with a driven pulley 15, and the inner ring of the driven pulley 15 is fixedly connected to the outer surface of the main shaft 9. The driven pulley 15 is connected to the driving pulley 12 through the belt 13; the driving pulley 12 drives the driven pulley 15 to rotate through the pulley, thereby driving the main shaft 9 to rotate, thereby driving the outer ring 6 of the bearing to rotate continuously, and starting the cylinder 14 so that the output end of the cylinder 14 extends, thereby applying vertical upward pressure to the inner ring 5 of the bearing; then use the sensor 1 to measure the axial looseness of the bearing. The gap size is monitored to complete the detection of the bearing axial clearance. Using this bearing clearance detection device, the bearing inner ring is fixed to the core shaft using a concentric shaft method. The two inner rings are positioned concentrically based on the bearing inner diameter, avoiding translation and angular deviation between the inner ring axis and the outer ring axis during the measurement process, thereby greatly improving the measurement accuracy. A torque wrench is used to tighten the screw to axially tighten the bearing inner ring. The bearing outer ring is axially tightened in 120° equal sections using end face positioning to fix the bearing outer ring between the upper cover and the main shaft. During the detection process, no wear is caused to the outer surfaces of the bearing raceway and rolling elements.

Claims

1. A high-precision long-tube double-row angular contact ball bearing axial clearance detection device, characterized by: It includes a sensor (1), a screw (2), a spacer (3), a core shaft (4), a locking screw (7), an upper cover (8), a main shaft (9), a marble horizontal platform (10), a motor (11), a driving pulley (12), a belt (13), a cylinder (14), a driven pulley (15), a cylindrical roller bearing (16), a sleeve (17), an adjusting arm (18), a locking bolt (19), a column (20) and a frame (21); The top of the frame (21) is provided with a marble horizontal platform (10), a through hole is machined in the center of the upper surface of the marble horizontal platform (10), a sleeve (17) is embedded in the through hole, the bottom of the main shaft (9) is inserted into the inside of the sleeve (17), and a cylindrical roller bearing (16) is provided between the outer surface of the main shaft (9) and the inner wall of the sleeve (17), a circular through hole is machined on the bottom end face of the main shaft (9), a cylinder (14) is embedded in the through hole, and a concave groove is provided on the top of the output end of the cylinder (14). The concave limiting block is a block having a circular boss on the lower portion of the outer surface of the core shaft (4), and the bottom end of the core shaft (4) is inserted into the blind hole on the upper surface of the concave limiting block. A threaded through hole is processed at the center of the top end face of the core shaft (4), and a through hole is processed at the bottom of the countersunk hole of the concave limiting block. The bottom end of the screw (2) passes through the pad (3), the threaded through hole on the end face of the core shaft (4) and the through hole on the concave limiting block in sequence, and contacts the output end of the cylinder (14). The upper surface of the main shaft (9) is connected to the upper cover sleeve through a locking screw (7). (8) is connected, one end of the upper surface of the marble horizontal platform (10) is provided with a through hole, the interior of the through hole is embedded with a motor (11), the output end of the motor (11) is provided with a driving pulley (12), the bottom of the main shaft (9) is provided with a driven pulley (15), and the inner ring of the driven pulley (15) is fixedly connected to the outer surface of the main shaft (9), the driven pulley (15) is connected to the driving pulley (12) through a belt (13), and the other end of the upper surface of the marble horizontal platform (10) is provided with a column (20), the column The outer surface of the column (20) is provided with a plurality of grooves uniformly arranged along the length direction. One end of the upper surface of the adjusting arm (18) is sleeved on the column (20), and a threaded hole is provided on the end surface of the adjusting arm (18). A locking bolt (19) is provided inside the threaded hole, and the end surface of the locking bolt (19) is inserted into one of the grooves on the outer surface of the column (20). The other end of the adjusting arm (18) is provided with a sensor (1), and the bottom end of the sensor (1) contacts the top end surface of the screw rod (2).

2. A high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 1, characterized in that: The bottom of the motor (11) is fixedly connected to the middle of the lower surface of the baffle (22) via a motor seat.

3. A high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 2, characterized in that: The cross-sectional area of ​​the through hole at one end of the upper surface of the marble horizontal platform (10) is smaller than the area of ​​the baffle (22).

4. A high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 3, characterized in that: The baffle (22) is fixedly connected to the marble horizontal platform (10) via bolts.

5. The high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 1, characterized in that: The upper cover sleeve (8) is in the shape of a cylinder with one end closed and the other end open and having an inner cavity, and a through hole is provided at the center of the closed end surface of the upper cover sleeve (8).

6. A high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 5, characterized in that: The core shaft (4) is arranged in the inner cavity of the upper cover sleeve (8).

7. The high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 1, characterized in that: The bottom of the column (20) is evenly provided with three triangular support plates along the circumferential direction.

8. The high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 7, characterized in that: The triangular support plate is fixedly connected to the upper surface of the marble horizontal platform (10) through bolts.

9. The high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 7, characterized in that: The upright column (20) is integrally arranged with the triangular support plate.

10. The high-precision long-tube double-row angular contact ball bearing axial clearance detection device according to claim 1, characterized in that: The diameter of the driving pulley (12) is smaller than the diameter of the driven pulley (15).

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