Driving equipment for measuring dynamic stiffness of bearing

Abstract

The utility model relates to a driving device for bearing dynamic stiffness measurement, and belongs to the field of bearing dynamic stiffness measurement. The equipment comprises a fan, a transmission air duct, an impeller shell, a bearing shell, an impeller and a rotating shaft, and is specifically structurally characterized in that the output end of the fan is communicated with an inner cavity of the impeller shell through the transmission air duct, the impeller shell is connected with one end of the bearing shell through a screw, and the bearing shell and the inner wall of the impeller shell jointly form an inner cavity of the driving equipment; a horizontal rotating shaft is arranged in the inner cavity, an impeller is installed on the rotating shaft on the side face of the inner cavity of the impeller shell, and a test bearing is installed on the rotating shaft on the side face of the inner cavity of the bearing shell. According to the utility model, the vibration of a long shaft system in the form that a motor is connected with a coupling can be effectively avoided, the two ends of the rotating shaft can be exposed through the driving form, dynamic balance adjustment can be carried out on the two end surfaces of the rotating shaft simultaneously, and the test precision is improved.

Description

Technical Field

[0001] The utility model relates to a driving device for measuring the dynamic stiffness of a bearing, belonging to the field of bearing dynamic stiffness measurement. Background Art

[0002] Bearing dynamic stiffness refers to the stiffness exhibited by a bearing under load, i.e., its ability to support the object being loaded. It reflects the relationship between the bearing's deformation and the amount of load applied, and is the ratio of the bearing's deformation to the amount of load applied.

[0003] The characteristics of bearing dynamic stiffness are as follows:

[0004] 1. High rigidity: The higher the dynamic rigidity of the bearing, the smaller the deformation of the bearing when carrying load, thereby improving the processing accuracy of the equipment.

[0005] 2. Impact on equipment precision: Bearing dynamic stiffness is one of the important factors affecting equipment processing accuracy. When equipment requires high precision, it is necessary to select bearings with high dynamic stiffness to ensure equipment stability and accuracy.

[0006] 3. Affected by working state and working conditions: The dynamic stiffness of the bearing is affected by working state and working conditions, including temperature, lubrication state, speed, load size, load direction, etc. These factors will affect the dynamic stiffness of the bearing.

[0007] Bearing dynamic stiffness measurement evaluates the bearing's dynamic stiffness by measuring its ability to deform under dynamic loads. Dynamic stiffness refers to the bearing's ability to resist deformation when subjected to dynamic forces and is typically determined by measuring the displacement of the bearing during deformation.

[0008] The measurement method of bearing dynamic stiffness is as follows:

[0009] 1. Use a bearing dynamic stiffness tester: This instrument uses a precision axial loading device that allows for stable and continuous loading, with the applied load adjustable between 50 and 500 N. Equipped with a high-precision force sensor and an inductive displacement sensor, the instrument calculates stiffness based on sampling results and automatically plots a stiffness curve. It is suitable for stiffness assessment of precision angular contact ball bearings.

[0010] 2. Use a rolling bearing dynamic and static stiffness test device: This device, which includes a rotating motor, displacement sensor, and pressure sensor, measures the bearing's dynamic and static stiffness by applying a load with a vibration frequency. This method considers the effects of both load frequency and bearing rotation frequency, ensuring more accurate dynamic stiffness measurements.

[0011] The dynamic stiffness of the bearing is one of the most critical performance parameters in the spindle system and directly affects the accuracy of the spindle system. Different from the measurement of static stiffness, dynamic stiffness refers to the ability to resist dynamic displacement changes when subjected to alternating loads. Dynamic stiffness is the main indicator for measuring the vibration resistance of the structure. Therefore, the study of bearing dynamic stiffness testing is more important for accurately obtaining the dynamic characteristics of the spindle bearing system. For the spindle-bearing joint, the dynamic stiffness is affected by many factors, such as: the vibration of the drive mechanism, the bearing preload, the bearing pairing method, the matching method between the bearing and the spindle, the spindle rotation speed, the bearing temperature rise, etc. Therefore, the research and development of the drive form is of great significance to the study of the dynamic stiffness of the bearing. Utility Model Content

[0012] The purpose of this utility model is to provide a driving device for measuring the dynamic stiffness of bearings, which is used for measuring the dynamic stiffness of high-speed precision bearings. By changing the driving form, the test equipment can perform bearing dynamic stiffness testing at high speed and low vibration.

[0013] The technical solution of this utility model is:

[0014] A driving device for measuring the dynamic stiffness of a bearing, the device includes a fan, a transmission air duct, an impeller housing, a bearing housing, an impeller, and a rotating shaft. The specific structure is as follows: the output end of the fan is connected to the inner cavity of the impeller housing through the transmission air duct, the impeller housing is connected to one end of the bearing housing by screws, the bearing housing and the inner wall of the impeller housing together form the inner cavity of the driving device, a horizontal rotating shaft is provided in the inner cavity, the rotating shaft is located on the side of the inner cavity of the impeller housing, and the impeller is installed, and the rotating shaft is located on the side of the inner cavity of the bearing housing to install a test bearing.

[0015] The driving device for measuring the dynamic stiffness of the bearing is characterized in that a stiffness measuring device is installed on the other end of the bearing housing, the stiffness measuring device is connected to the other end of the bearing housing through a mounting plate, one end of the stiffness measuring device extends into the inner cavity of the bearing housing and corresponds to the test bearing through a bearing push plate, and the stiffness measuring device contacts the test bearing through the bearing push plate and applies thrust to the test bearing.

[0016] The driving device for measuring the dynamic stiffness of the bearing has two ends of the transmission air duct riveted to the fan and the impeller housing respectively.

[0017] In the driving device for measuring the dynamic stiffness of a bearing, the impeller and the rotating shaft are fixed by key cooperation.

[0018] In the driving device for measuring the dynamic stiffness of the bearing, the fan is fixed to the mounting frame by screws.

[0019] In the driving device for measuring the dynamic stiffness of a bearing, the bearing housing is mounted on a fixing frame, and the fixing frame is fixed to the mounting frame by screws.

[0020] The design idea of ​​this utility model is:

[0021] The utility model discloses a drive device for measuring the dynamic stiffness of bearings, which is used to measure the dynamic stiffness of bearings under high-speed operating conditions. This drive type reduces the use of cumbersome connection methods such as couplings, and reduces factors such as vibration of the test equipment caused by the drive type. The fan drive type assembles the impeller with the rotating shaft using a key. The fan drives the impeller to rotate at high speed, thereby driving the bearing to rotate for measurement. This can drive the bearing to rotate at high speed without generating heat, and the drive speed is higher than that of conventional drive types. In addition, this drive type can leak the tail end of the rotating shaft, facilitating the dynamic balance adjustment of the equipment and improving the test accuracy.

[0022] The advantages and beneficial effects of the utility model are:

[0023] (1) The device of the utility model can provide high-speed drive for the bearing;

[0024] (2) The utility model adopts the tail end drive form of the rotating shaft, eliminating the need for couplings, connectors and other connections;

[0025] (3) The utility model adopts a direct drive mode, and the overall drive form has small vibration and little impact on the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1-Figure 2 This is the structural design diagram of the drive device of the utility model. Figure 1 For the axonometric drawing of the drive equipment, Figure 2 This is a cross-sectional view of the drive equipment.

[0027] The reference numerals in the figure are: 1. fan, 2. transmission air duct, 3. impeller housing, 4. bearing housing, 5. fixing frame, 6. stiffness measuring device, 7. mounting frame, 8. impeller, 9. rotating shaft, 10. mounting plate, 11. bearing push plate, 12. test bearing. DETAILED DESCRIPTION

[0028] like Figure 1-Figure 2 As shown, the utility model proposes a driving device for measuring the dynamic stiffness of a bearing, which mainly includes a fan 1, a transmission air duct 2, an impeller housing 3, a bearing housing 4, a fixing frame 5, an impeller 8, a rotating shaft 9, etc. The specific structure is as follows:

[0029] The fan 1 is fixed to the mounting frame 7 by screws, and the output end of the fan 1 is connected to the inner cavity of the impeller housing 3 through the transmission air duct 2. The two ends of the transmission air duct 2 are riveted to the fan 1 and the impeller housing 3 respectively. The impeller housing 3 is connected to one end of the bearing housing 4 by screws. The bearing housing 4 is mounted on the fixing frame 5, and the fixing frame 5 is fixed to the mounting frame 7 by screws. The inner wall of the bearing housing 4 and the impeller housing 3 jointly form the inner cavity of the driving device, and a horizontal rotating shaft 9 is provided in the inner cavity. The rotating shaft 9 is located on the side of the inner cavity of the impeller housing 3 and an impeller 8 is installed. The impeller 8 and the rotating shaft 9 are fixed by key cooperation. The rotating shaft 9 is located on the side of the inner cavity of the bearing housing 4 and a test bearing 12 is installed. The fan 1 drives the impeller 8 to rotate at high speed, and the impeller 8 drives the rotating shaft 9 and the test bearing 12 thereon to rotate at high speed.

[0030] The stiffness measuring device 6 is connected to the other end of the bearing housing 4 through the mounting plate 10. One end of the stiffness measuring device 6 extends into the inner cavity of the bearing housing 4 and corresponds to the test bearing 12 through the bearing push plate 11. The stiffness measuring device 6 contacts the test bearing 12 through the bearing push plate 11 and applies thrust to the test bearing 12. The applied thrust value is fed back in real time through the force sensor of the stiffness measuring device 6.

[0031] Test results show that the fan drive method used in this utility model avoids complex shaft connections such as couplings and long motor shafts, minimizing the impact of vibrations from couplings and long motor shafts on bearing dynamic stiffness measurements. This drive method also allows for leakage at both ends of the rotating shaft, allowing dynamic balancing to be performed simultaneously on both ends, improving test accuracy. The high speed provided by this drive method more accurately reflects the measured value of bearing dynamic stiffness.

Claims

1. A driving device for measuring bearing dynamic stiffness, characterized in that: The device includes a fan, a transmission air duct, an impeller housing, a bearing housing, an impeller, and a rotating shaft. The specific structure is as follows: the output end of the fan is connected to the inner cavity of the impeller housing through the transmission air duct, the impeller housing is connected to one end of the bearing housing by screws, and the bearing housing and the inner wall of the impeller housing together form the inner cavity of the driving device. A horizontal rotating shaft is provided in the inner cavity, and the impeller is installed on the side of the rotating shaft on the inner cavity of the impeller housing, and the test bearing is installed on the side of the rotating shaft on the inner cavity of the bearing housing.

2. The driving device for measuring bearing dynamic stiffness according to claim 1, characterized in that: A stiffness measuring device is installed on the other end of the bearing housing. The stiffness measuring device is connected to the other end of the bearing housing through a mounting plate. One end of the stiffness measuring device extends into the inner cavity of the bearing housing and corresponds to the test bearing through a bearing push plate. The stiffness measuring device contacts the test bearing through the bearing push plate and applies thrust to the test bearing.

3. The driving device for measuring bearing dynamic stiffness according to claim 1, characterized in that: The two ends of the transmission air duct are riveted to the fan and impeller casing respectively.

4. The driving device for measuring bearing dynamic stiffness according to claim 1, characterized in that: The impeller and the rotating shaft are fixed by key fitting.

5. The driving device for measuring bearing dynamic stiffness according to claim 1, characterized in that: The fan is fixed to the mounting frame by screws.

6. The driving device for measuring bearing dynamic stiffness according to claim 1, characterized in that: The bearing housing is mounted on a fixing bracket, and the fixing bracket is fixed to the mounting bracket by screws.

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