A bearing precision detection device

Abstract

The utility model relates to a kind of bearing precision detection devices, including force unit, working simulation unit and bearing detection unit;Working simulation unit includes sleeve and shaft rod, the outer ring of measured bearing is interference fit with sleeve, the inner ring of measured bearing is interference fit with shaft rod, the outside of shaft rod is equipped with driving device, driving device rotates shaft rod by belt drive;Force unit includes mechanics sensor and cylinder, mechanics sensor one end is connected with shaft rod by connecting block, other end is connected with the piston rod of cylinder, and the piston rod of cylinder is coaxial with shaft rod;The measuring head of bearing detection unit is located on measured bearing or sleeve.This bearing precision detection device solves the problem that the deformation of the outer ring of the bearing is difficult to measure when the main shaft bearing is subjected to different axial forces in static and dynamic states. The trend of the deformation of the outer ring of the main shaft bearing in each state can be accurately represented by the values of each sensor.

Description

Technical Field

[0001] This utility model relates to a bearing precision testing device, belonging to the technical field of bearing precision measurement devices. Background Technology

[0002] Spindle bearings are the core components of machine tool spindles, and their performance determines the overall performance, machining accuracy, operational stability, and service life of the lathe spindle. Traditional bearing accuracy testing methods, such as manual measurement, are inefficient and cannot dynamically detect bearing deformation. In the face of large-scale production, they cannot meet the demands for efficient and accurate testing, thus affecting the overall production pace. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a bearing precision testing device. This bearing precision testing device solves the problem that it is difficult to measure the deformation of the outer ring of the spindle bearing when it is subjected to different axial forces under static and dynamic conditions. It can accurately show the trend of the change of the outer ring deformation of the spindle bearing under various states through the values ​​of various sensors.

[0004] To solve the above problems, the specific technical solution of this utility model is as follows: A bearing precision testing device includes a force application unit, a working simulation unit, and a bearing testing unit; the working simulation unit includes a sleeve and a shaft, the outer ring of the bearing being tested is interference-fitted with the sleeve, the inner ring of the bearing being tested is interference-fitted with the shaft, and a driving device is provided on the outside of the shaft, the driving device drives the shaft to rotate via a belt; the force application unit includes a mechanical sensor and a cylinder, one end of the mechanical sensor is connected to the shaft via a connecting block, and the other end is connected to the piston rod of the cylinder, and the piston rod of the cylinder is coaxial with the shaft; the measuring head of the bearing testing unit is located on the bearing being tested or the sleeve.

[0005] The drive device includes a motor and a belt drive. One pulley of the belt drive is connected to the output shaft of the motor, and the other pulley is coaxially connected to the shaft. The two pulleys are driven by a belt.

[0006] The sleeve is supported on the upper surface of the precision worktable; the cylinder is hinged through a cylinder bracket set on the upper surface of the precision worktable.

[0007] A central frame is provided between the sleeve and the cylinder bracket. The central frame has a through hole in the center, and rollers are evenly distributed around the circumference inside the through hole. The shaft is supported on the central frame by the rollers and is coaxially engaged with the outer circumference of the shaft.

[0008] The bearing detection unit is a displacement sensor; when detecting the axial deformation of the outer ring of the bearing under test, the measuring head of the displacement sensor is parallel to the shaft axis and in contact with the outer ring of the bearing under test; when measuring the radial deformation of the bearing under test, the measuring head of the displacement sensor is in radial contact with the outer wall of the sleeve.

[0009] The bearing accuracy testing device of this application adopts the above structure and has the following advantages: 1. This device applies axial force through a force-applying device. The greater the force on the spindle, the greater the deformation of the bearing, and the greater the deformation of the corresponding position of the sleeve. The reading of the displacement sensor set in the middle can indicate the magnitude of the deformation, thus showing the deformation of the outer ring of the spindle bearing under different forces under static or dynamic conditions. 2. The center frame can ensure the coaxiality of the shaft and sleeve, and ensure that no radial movement occurs during testing; 3. The force-applying device can apply axial force, and the value of the axial force can be confirmed by the mechanical sensor installed on it; 4. The motor drives the shaft to rotate via a belt, simulating the working state of the main shaft, and the bearing deformation is measured by the value of the displacement sensor. 5. This device can measure the deformation of the outer ring of the spindle bearing under different axial forces in static and dynamic conditions, thereby calculating and fitting the bearing state under different working conditions, providing data basis for the selection of spindle bearings, which is of great value to the development of bearing precision measurement field and of great significance to the development of testing equipment. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the bearing precision testing device.

[0011] Figure 2 This is a schematic diagram of the force application unit.

[0012] Figure 3 This is a schematic diagram of a working simulation unit.

[0013] Figure 4 This is a schematic diagram of the bearing inspection unit detecting the deformation of the shaft.

[0014] Figure 5 A schematic diagram of the radial deformation detection unit for bearings.

[0015] In the figure, 1-sleeve, 2-bearing under test, 3-displacement sensor, 4-center frame, 5-shaft, 6-belt, 7-connecting block, 8-mechanical sensor, 9-motor, 10-cylinder, 11-cylinder bracket, 12-precision worktable. Detailed Implementation

[0016] like Figures 1 to 3As shown, a bearing precision testing device includes a force application unit, a working simulation unit, and a bearing testing unit. The working simulation unit includes a sleeve 1 and a shaft 5. The outer ring of the bearing 2 under test is interference-fitted with the sleeve 1, and the inner ring of the bearing 2 under test is interference-fitted with the shaft 5. A drive device is provided on the outside of the shaft 5, and the drive device drives the shaft 5 to rotate via a belt. The force application unit includes a force sensor 8 and a cylinder 10. One end of the force sensor 8 is connected to the shaft 5 via a connecting block 7, and the other end is connected to the piston rod of the cylinder 10. The piston rod of the cylinder 10 is coaxial with the shaft 5. The measuring head of the bearing testing unit is located on the bearing 2 under test or the sleeve 1.

[0017] The drive device includes a motor 9 and a belt device 6. One pulley of the belt device 6 is connected to the output shaft of the motor 9, and the other pulley is coaxially connected to the shaft 5. The two pulleys are driven by a belt.

[0018] The sleeve 1 is supported on the upper surface of the precision worktable 12; the cylinder 10 is hinged through the cylinder bracket 11 provided on the upper surface of the precision worktable 12.

[0019] A central frame 4 is provided between the sleeve 1 and the cylinder bracket 11. The central frame 4 has a through hole in the center, and rollers are evenly distributed in the through hole. The shaft 5 is supported on the central frame 4 by the rollers and is coaxially engaged with the outer circumference of the shaft 5.

[0020] like Figure 4 and Figure 5 As shown, the bearing detection unit is a displacement sensor 3; when detecting the axial deformation of the outer ring of the bearing 2 under test, the measuring head of the displacement sensor 3 is parallel to the axis of the shaft 5 and the measuring head is in contact with the outer ring of the bearing 2 under test; when measuring the radial deformation of the bearing 2 under test, the measuring head of the displacement sensor 3 is in radial contact with the outer wall of the sleeve 1.

[0021] The working process of the bearing precision testing device in this application is as follows: Before the experiment, check the accuracy of the device's installation position, ensuring correct connections between the bottom of the center frame 4 and the precision worktable 12, the sleeve 1 and the precision worktable 12, and the cylinder bracket 11 and the precision worktable 12. Adjust the position of the rollers on the center frame 4 to ensure the coaxiality of the shaft 5 and the sleeve 1. Ensure that the inner ring of the bearing 2 under test is installed in the corresponding position on the shaft 5, simulating the actual state during spindle assembly and operation. Before testing, conduct a drive experiment to ensure that all parts are securely installed, guaranteeing that the shaft 5 will not experience radial displacement or vibration under load. To prevent the displacement sensor 3 from malfunctioning, measurements should be performed within a feasible testing range to ensure accurate instrument readings and protect the equipment from damage.

[0022] During the experiment, the starting cylinder 10 applies force to the shaft 5 through the force sensor 8, transmitting the axial force of the shaft 5 to the bearing 2 under test, and the axial deformation is measured by the displacement sensor 3. When the measuring head of the displacement sensor 3 makes radial contact with the outer wall of the sleeve 1, the radial deformation of the bearing 2 under test is measured. In the above measurement process, the motor 9 can also be started to make the bearing 2 under test rotate coaxially with the shaft 5, and the dynamic deformation of the bearing can be measured.

Claims

1. A bearing precision detection device, characterized by: It includes a force application unit, a work simulation unit, and a bearing testing unit; the work simulation unit includes a sleeve (1) and a shaft (5), the outer ring of the bearing (2) being tested is interference-fitted with the sleeve (1), the inner ring of the bearing (2) being tested is interference-fitted with the shaft (5), and a drive device is provided on the outside of the shaft (5), the drive device drives the shaft (5) to rotate via a belt; the force application unit includes a mechanical sensor (8) and a cylinder (10), one end of the mechanical sensor (8) is connected to the shaft (5) via a connecting block (7), and the other end is connected to the piston rod of the cylinder (10), and the piston rod of the cylinder (10) is coaxial with the shaft (5); the measuring head of the bearing testing unit is located on the bearing (2) being tested or the sleeve (1).

2. The bearing precision testing device according to claim 1, characterized in that: The drive device includes a motor (9) and a belt device (6). One pulley of the belt device (6) is connected to the output shaft of the motor (9), and the other pulley is coaxially connected to the shaft (5). The two pulleys are driven by a belt.

3. The bearing precision detection apparatus of claim 1, wherein: The sleeve (1) is supported on the upper surface of the precision worktable (12); the cylinder (10) is hinged through the cylinder bracket (11) provided on the upper surface of the precision worktable (12).

4. The bearing precision detection apparatus of claim 1, wherein: A central frame (4) is provided between the sleeve (1) and the cylinder bracket (11). The central frame (4) has a through hole in the center. Rollers are evenly distributed in the through hole. The shaft (5) is supported on the central frame (4) by the rollers and is coaxially engaged with the outer circumference of the shaft (5).

5. The bearing precision detection apparatus of claim 1, wherein: The bearing detection unit is a displacement sensor (3); when detecting the axial deformation of the outer ring of the bearing (2) under test, the measuring head of the displacement sensor (3) is parallel to the axis of the shaft (5) and the measuring head is in contact with the outer ring of the bearing (2) under test; when measuring the radial deformation of the bearing (2) under test, the measuring head of the displacement sensor (3) is in radial contact with the outer wall of the sleeve (1).

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