CN203337382U - Bearing precision performance testing device - Google Patents

Abstract

The utility model discloses a bearing precision performance testing device, which comprises a main shaft and a motor. The motor is installed on a first frame, and the main shaft is fixed on a second frame through a main shaft casing sleeved outside it; the rear end of the main shaft is It is fixedly connected with the output shaft of the motor; the front end of the main shaft and the inside of the main shaft housing are provided with the bearing to be tested; on the main shaft housing, the surface matching the main shaft housing and the bearing to be tested is provided with an acceleration sensor and a temperature sensor The radial through hole of the main shaft; the part where the front end of the main shaft extends out of the main shaft housing is equipped with a displacement sensor for measuring the radial runout of the front end of the main shaft. In the utility model, the main shaft and the motor are respectively fixed on two racks to reduce the influence of the vibration of the servo motor on the main shaft; The constant pressure preloading device can change the type and quantity of the springs used according to the test requirements, so as to realize the constant pressure preloading of the tested bearings.

Description

A bearing precision performance testing device

technical field

The utility model belongs to the field of bearing testing, in particular to a bearing precision performance testing device.

Background technique

Rolling bearings are one of the most important basic parts widely used in mechanical equipment, especially on high-speed and high-precision manufacturing machines. The precision retention of rolling bearings and the control of parameters such as temperature, acceleration, and spindle runout will directly affect the accuracy of the processed workpiece. quality. Therefore, before the bearing leaves the factory, a long-term running test is carried out on the same batch of bearing samples to measure the rotation accuracy of the bearing and test the accuracy retention of the bearing. It is very necessary to monitor the various working parameters of the bearing under the condition of load. At present, the widely used bearing precision performance testing machine has a complex structure, and there is a large deviation from the actual working conditions of the bearing. The measured physical quantities are relatively small and the accuracy is not high. The versatility is poor, and the practical application value is small.

Utility model content

The purpose of this utility model is to solve the above problems and provide a bearing precision performance test device, which can test the temperature, vibration acceleration and rotation accuracy of the outer ring of the bearing under different speeds, different preloads and different loads. and other parameters to test and monitor, analyze the measurement data, test the performance of the bearing in terms of accuracy, and guide the determination of the geometric parameters of the bearing and the selection of parameters such as lubrication and preload.

In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: comprising a main shaft and a motor, the motor is installed on the first frame, the main shaft is fixed on the second frame through the main shaft housing sleeved outside it; The rear end is fixedly connected with the output shaft of the motor; at the front end of the main shaft, the bearing to be tested is arranged inside the main shaft housing; and the radial through hole of the temperature sensor; the part where the front end of the main shaft protrudes from the main shaft housing is installed with a displacement sensor for measuring the radial runout of the front end of the main shaft.

The rear end of the above-mentioned main shaft is equipped with a preloading device for preloading the bearing under test at a constant pressure.

The above-mentioned preloading device includes a pair of angular contact ball bearings, and a bearing seat is set on the angular contact ball bearing; a linear bearing is also arranged between the bearing seat and the main shaft housing; a preload spring is fixed on the front end surface of the bearing seat , the other end of the preload spring is fixedly connected with the main shaft housing through the thrust plate.

The above-mentioned main shaft housing is provided with four radial through holes evenly distributed in the circumferential direction, three of which are used to install temperature sensors, and one is used to install acceleration sensors; the temperature sensors and acceleration sensors are directly connected to the outer surface of the tested bearing. The circle is fixedly connected.

The above-mentioned temperature sensor is installed in the hollow bolt with a hole in the middle, and the temperature sensor is fixed on the main shaft shell through the middle hole bolt; a compression spring is installed between the temperature sensor and the hollow bolt, and one end of the compression spring is fixed on the temperature sensor. The lower spring stops, and the other end is fixed on the lower end of the hollow bolt; the upper end of the temperature sensor is connected with an output signal line.

The above-mentioned main shaft includes a main shaft mandrel, and the front end of the main shaft mandrel is processed with a threaded hole for installing the eccentric mandrel; the rear end of the main shaft mandrel is fixedly connected with the output shaft of the motor.

The rear end of the main shaft is fixedly connected with the output shaft of the motor through a flexible coupling.

An eccentric mandrel for radially applying a fixed load to the main shaft is installed in the threaded hole at the front end of the main shaft mandrel.

The part where the front end of the above-mentioned main shaft protrudes from the main shaft housing is symmetrically installed with two displacement sensors separated by 180 degrees in the circumferential direction.

The above-mentioned motor is a servo motor.

Compared with the prior art, the utility model has the following beneficial effects:

The utility model is a bearing precision performance testing device, which fixes the main shaft and the motor on two racks respectively, reduces the influence of the vibration of the servo motor on the main shaft, improves the rotation accuracy and rigidity of the main shaft, and reduces the influence of the servo motor on the tested bearing. disturbance of operation.

Further, the rear end of the main shaft of the utility model is equipped with a pre-tensioning device, which can change the type and quantity of the springs used according to the test requirements, so as to realize the constant-pressure pre-tightening of the tested bearing.

Furthermore, the main shaft of the utility model is connected with the output shaft of the servo motor through a flexible coupling and drives the main shaft to rotate, which minimizes the influence of the vibration of the servo motor on the main shaft and ensures the reliability of the sensor measurement data.

Further, the rear end of the main shaft of the utility model is supported by a pair of precise angular contact ball bearings, which can improve the rotation accuracy and rigidity of the main shaft, and further reduce the interference of the servo motor to the operation of the bearing under test.

Further, the utility model adopts a temperature sensor with a radial spring compression mechanism, which avoids the separation of the temperature sensor from the outer ring of the bearing under test due to vibration and affects the accuracy of the measurement, and can also ensure the temperature under the condition of external vibration. The sensor is in close contact with the outer ring of the tested bearing to improve the temperature measurement accuracy.

Further, the front end of the main shaft of the present invention is symmetrically installed with two precision displacement sensors symmetrically arranged to measure the radial displacement of the mandrel at a distance of 180 degrees in the circumferential direction, and the two-point method is used to process the collected displacement data, which can be separated and obtained in real time. The shape error and the rotation error of the bearing, the long-term operation test is carried out, the change of the rotation error of the spindle bearing is recorded, and the accuracy retention of the tested bearing can be detected.

Furthermore, the eccentric mandrel is installed on the main shaft of the utility model, and the size and position of the eccentric mass can be determined according to the size of the required loading force and the acting position, so as to realize quantitative loading on the main shaft bearing in the radial direction.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the temperature sensor of the present invention.

Among them, 1 is the tested bearing; 2 is the acceleration sensor; 3 is the main shaft housing; 4 is the preload spring; 5 is the bearing seat; 6 is the angular contact ball bearing; 7 is the flexible coupling; 8 is the servo motor; 9 10 is the main shaft mandrel; 11 is the eccentric mandrel; 12 is the temperature sensor; 121 is the spring stop point; 122 is the compression spring; 123 is the lock nut; 124 is the output signal line; 125 is the hollow bolt ; 13 push plate.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Referring to Fig. 1, the utility model includes a main shaft and a servo motor 8, the servo motor 8 is installed on the first frame, and the main shaft is fixed on the second frame by the main shaft shell 3 sleeved outside it; the main shaft includes a main shaft mandrel 10. The front end of the main shaft mandrel 10 is processed with a threaded hole for installing the eccentric mandrel 11, and the threaded hole at the front end of the main shaft mandrel 10 is installed with an eccentric mandrel 11 for applying a quantitative load in the radial direction of the main shaft; the main shaft mandrel 10 The rear end is fixedly connected with the output shaft of the servo motor 8 through the flexible coupling 7, and the servo motor 8 drives the main shaft to rotate. The flexible connection between the servo motors minimizes the impact of the vibration of the servo motor on the main shaft and ensures the reliability of the sensor measurement data; the main shaft is fixed on the frame through the main shaft housing 3; the rear end of the main shaft is connected to the servo motor 8 The output shaft is fixedly connected; at the front end of the main shaft, the bearing 1 to be tested is arranged inside the main shaft housing 3, and the rear end of the main shaft is equipped with a preloading device for preloading the bearing under test 1 at a constant pressure; the preloading device includes a pair of angular contacts Ball bearing 6, angular contact ball bearing 6 is fitted with bearing seat 5, the preloading device can realize the constant pressure preloading of the tested bearing according to the test requirements, and the rear end is supported by a pair of precision angular contact ball bearings, which can improve the stability of the main shaft The rotation accuracy and rigidity further reduce the influence of the servo motor on the tested bearing; a linear bearing 9 is also provided between the bearing seat 5 and the main shaft housing 3; a preload spring 4 is fixed on the front end surface of the bearing seat 5, and The other end of the spring 4 is fixedly connected to the main shaft housing 3 through the thrust plate 13; on the main shaft housing 3, there are four uniformly distributed radial Through holes, three of which are used to install temperature sensors 12, and one is used to install acceleration sensors 2; said temperature sensors 12 and acceleration sensors 2 are directly fixedly connected with the outer ring of the tested bearing; wherein, temperature sensors 12 are installed in the middle with In the hollow bolt 125 of the hole, the temperature sensor 12 is fixed on the main shaft housing 3 by the middle hole bolt 125; a compression spring 122 is installed between the temperature sensor and the hollow bolt 125, and one end of the compression spring 122 is fixed on the temperature sensor 12. On the spring stop point 121 below, the other end is fixed on the lower end of the hollow bolt 125; the upper end of the temperature sensor 12 is connected with an output signal line 124, and the hollow bolt 125 is screwed into the threaded hole of the main shaft housing 3 to a certain depth, and locked with a lock When the tightening nut 123 is tightened, the spring will be compressed, and the spring will compress the temperature sensor, forcing it to keep in close contact with the outer ring of the bearing under test, so as to avoid the separation of the temperature sensor from the outer ring of the bearing under test and affect the measurement due to vibration. Accuracy; the acceleration sensor 2 and the temperature sensor 12 are fixedly connected directly to the outer ring of the tested bearing 1 through the through hole on the main shaft housing 3 to ensure the reliability of the acceleration signal and temperature signal; the front end of the main shaft extends out of the main shaft housing Part 3, two displacement sensors S1 and S2 for measuring the radial runout of the front end of the spindle are installed symmetrically at a distance of 180 degrees in the circumferential direction ;It is used to measure the radial displacement of the front end of the spindle, and the two-point method is used to process the displacement data. The shape error of the spindle and the rotation error of the bearing can be separated in real time, and the long-term running test can be used to record the change of the rotation error of the spindle bearing. The accuracy retention of the tested bearing under certain test conditions.

The utility model is also equipped with an oil mist lubrication system, which can respectively use grease lubrication or oil mist lubrication to lubricate the tested bearing according to the test requirements.

The working process of the present utility model is like this:

Before the test, process the corresponding eccentric mandrel and determine the type and quantity of the pre-tightening spring according to the radial load required by the tested bearing and the required pre-tightening force, and lubricate the tested bearing as required to make the servo motor Drag the spindle to rotate at a certain speed and start collecting sensor data.

Using the two-point method to process the data of the precision displacement sensor at the front end of the spindle, the shape error of the spindle and the real-time rotation error of the spindle bearing can be obtained, and the long-term test can be carried out to record the change of the rotation error of the spindle bearing, and the accuracy retention of the tested bearing can be detected. It provides a reference for the determination of bearing geometric parameters, the selection of lubrication method and preload. By measuring the temperature of the outer ring of the bearing and comparing it with the room temperature, the temperature rise of the bearing under different working conditions can be obtained, and the acceleration signal of the outer ring of the bearing can be analyzed to analyze the early precision failure of the bearing.

The novel bearing precision performance testing device provided by the utility model has the following advantages:

(1) In the test device provided by the utility model, the driving servo motor and the main shaft are respectively fixed on two different racks and are driven by flexible couplings, which minimizes the interference of the servo motor on the operation of the main shaft and improves the test data. reliability.

(2) In the test device provided by the utility model, the rear end of the main shaft adopts a constant pressure pre-tightening device, which can change the type or quantity of the spring used to change the pre-tightening force of the bearing under test according to the test requirements, so as to realize the test of the bearing under test. constant pressure preload.

(3) In the test device provided by the utility model, the rear end of the main shaft is supported by a pair of precision angular contact ball bearings, which can improve the rotation accuracy and rigidity of the main shaft, and further reduce the influence of the servo motor on the tested bearing.

(4) In the test device provided by the utility model, four evenly distributed radial through holes are processed along the circumferential direction at the joint between the main shaft shell and the tested bearing, three of which are installed with temperature sensors and one with acceleration sensors. Test the temperature and acceleration signals of the outer ring of the bearing respectively.

(5) In the test device provided by the utility model, the temperature sensor with a radial compression structure is used to ensure that the temperature sensor is in close contact with the outer ring of the tested bearing even under the condition of external vibration, and the temperature measurement accuracy is improved.

(6) In the test device provided by the utility model, the front end of the main shaft is equipped with two precision displacement sensors symmetrically arranged to measure the radial displacement of the mandrel, and the two-point method is used to process the collected displacement data, and the shape error and the shape error of the main shaft can be separated in real time. The rotation error of the bearing, long-term running test, recording the change of the rotation error of the spindle bearing, can detect the accuracy retention of the tested bearing.

(7) In the test device provided by the utility model, the mandrel is processed with a threaded hole for installing the eccentric mandrel. According to the test requirements, different eccentric mandrels are processed to achieve quantitative radial loading on the main shaft.

(8) In the test device provided by the utility model, oil mist lubrication and grease lubrication can be selected respectively to lubricate the tested bearing to meet different test requirements.

The new bearing precision performance testing device provided by the utility model adopts the following main components:

1. Test angular contact ball bearing: ZYSB7008C, bearing inner diameter 40mm, shaft research technology.

2. Supporting angular contact ball bearing: ZYSB7007C, bearing inner diameter 35mm, shaft research technology.

3. Drive servo motor: HF-SP352, Mitsubishi, Japan.

4. Servo driver: MR-J3-350A, Mitsubishi, Japan.

5. Armored platinum thermal resistance temperature sensor with special structure: WZPK-191CT, Xi'an Zhonghan Automation Instrument Co., Ltd.

6. Precision displacement sensor: probe: rice iridium capacitive sensor (CS05)

Preamplifier: Miiridium DL6500 integrated preamplifier, German Miiridium.

7. Acceleration sensor: B&K4518-003, B&K, Denmark.

8. Temperature data acquisition system: Yokogawa MA100 data acquisition system, Shanghai Yokogawa International Trade Co., Ltd.

9. Acceleration and displacement data acquisition system: B&K3053-B-120, B&K, Denmark.

The above is only one embodiment of the utility model, not all or the only implementation. Any equivalent transformation adopted by those of ordinary skill in the art to the technical solution of the utility model by reading the specification of the utility model shall be considered as the present invention. covered by the claims of the utility model.

Claims (10)

1. A bearing accuracy performance testing device, characterized in that: it includes a main shaft and a motor, the motor is installed on the first frame, and the main shaft is fixed on the second frame through the main shaft housing (3) sleeved outside it; The rear end of the main shaft is fixedly connected with the output shaft of the motor; at the front end of the main shaft, the bearing (1) to be tested is arranged inside the main shaft housing (3); on the main shaft housing (3), the main shaft housing (3) and The mating surface of the tested bearing (1) is provided with radial through holes for installing the acceleration sensor (2) and the temperature sensor (12); the part where the front end of the main shaft protrudes from the main shaft housing (3) is installed with a hole for measuring the front end of the main shaft. Displacement sensor for radial runout. 2. The bearing precision performance testing device according to claim 1, characterized in that: the rear end of the main shaft is fitted with a preloading device for preloading the tested bearing (1) at a constant pressure. 3. The bearing accuracy performance testing device according to claim 2, characterized in that: the preloading device includes a pair of angular contact ball bearings (6), and the angular contact ball bearings (6) are overlaid with bearing seats (5 ), a linear bearing (9) is also provided between the bearing seat (5) and the main shaft housing (3); a preload spring (4) is fixed on the front end surface of the bearing seat (5), and the preload spring (4) The other end of the shaft is fixedly connected with the main shaft housing (3) through the thrust plate (13). 4. The bearing accuracy performance testing device according to claim 1, characterized in that: the main shaft housing (3) is provided with four radial through holes evenly distributed in the circumferential direction, three of which are used to install temperature One of the sensors (12) is used to install the acceleration sensor (2); the temperature sensor (12) and the acceleration sensor (2) are directly fixedly connected with the outer ring of the tested bearing. 5. The bearing accuracy performance testing device according to claim 4, characterized in that: the temperature sensor (12) is installed in a hollow bolt (125) with a hole in the middle, and the temperature sensor is connected to the center through the hole bolt (125). (12) is fixed on the spindle housing (3); a compression spring (122) is installed between the temperature sensor and the hollow bolt (125), and one end of the compression spring (122) is fixed on the spring below the temperature sensor (12) On the stop point (121), the other end is fixed on the lower end of the hollow bolt (125); the upper end of the temperature sensor (12) is connected with an output signal line (124). 6. The bearing accuracy performance testing device according to claim 1, characterized in that: the main shaft includes a main shaft mandrel (10), and the front end of the main shaft mandrel (10) is processed with a hole for installing an eccentric mandrel (11). threaded hole; the rear end of the main shaft mandrel (10) is fixedly connected with the output shaft of the motor. 7. The bearing precision performance testing device according to claim 1 or 6, characterized in that: the rear end of the main shaft is fixedly connected to the output shaft of the motor through a flexible coupling (7). 8. The bearing accuracy performance testing device according to claim 6, characterized in that: an eccentric mandrel (11) for applying a quantitative load in the radial direction of the main shaft is installed in the threaded hole at the front end of the main shaft mandrel (10) . 9. The bearing accuracy performance testing device according to claim 1, characterized in that: the part of the front end of the spindle protruding from the spindle housing (3) is symmetrically installed with two displacement sensors separated by 180 degrees in the circumferential direction ( S1, S2). 10. The bearing precision performance testing device according to claim 1, characterized in that: the motor is a servo motor (8).

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