Bearing limit rotation speed test data acquisition device
By designing a bearing limit speed test data acquisition device, the bearing outer ring temperature and time are monitored and stored in real time, solving the problem of excessive time consumption in the existing technology, and realizing efficient fusion of multiple test data and simplification of parameter adjustment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-10
AI Technical Summary
Existing bearing limit speed tests only focus on the endpoint data, resulting in a lack of correlation between multiple tests, excessive time consumption, and the need for repeated parameter adjustments.
Design a bearing limit speed test data acquisition device, including a base, main shaft, axial loading cylinder, temperature sensor and data acquisition unit, to monitor and save the bearing outer ring temperature and time in real time, and realize the correlation of multiple test data through data fusion.
The data acquisition device enables continuous and correlated storage of bearing limit speed test data, improving test efficiency, reducing repeated test time, and simplifying the parameter adjustment process.
Smart Images
Figure CN223985852U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a bearing testing device, specifically a bearing limit speed test data acquisition device. Background Technology
[0002] With the continuous development of the manufacturing industry, the quality requirements for bearings are increasing across all sectors. This demand is particularly prominent in the automotive, aerospace, and precision manufacturing industries. Precision machine tools are a crucial component of precision manufacturing, and rolling bearings, as vital parts of these tools, directly determine the efficiency and precision of the machine tool due to their high-speed performance. With the rapid development of technology and industry, the working environment of rolling bearings is becoming increasingly complex, placing higher demands on many aspects such as bearing speed, lifespan, load capacity, and design.
[0003] As the main supporting component of an electric spindle system, bearings are often damaged due to excessive frictional heat generated at high speeds, leading to malfunctions in the entire electric spindle system. This not only affects work efficiency but can also cause significant economic losses. Therefore, researching the limiting speed of bearings is of profound significance. Currently, most tests on bearing limiting speeds involve setting a warning temperature and gradually increasing the bearing speed until the temperature reaches the warning temperature to determine the bearing's limiting speed. This method primarily focuses on the endpoint data, and the corresponding experimental setup only processes the data during the test, without collecting or storing it. Multiple tests need to be independently repeated. This testing method requires repeating the test after each adjustment of bearing parameters. Since the time it takes for the bearing's outer ring temperature to stabilize at a certain speed is very long, the overall testing time is excessively long. Utility Model Content
[0004] The purpose of this invention is to solve the problem that focusing only on the endpoint data in bearing limit speed tests leads to a lack of correlation between multiple tests, and to provide a bearing limit speed test data acquisition device.
[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a bearing limit speed test data acquisition device, including a base for fixing the bearing to be tested and a main shaft inserted in the bearing to be tested for driving the inner ring of the bearing to be tested to rotate; the main shaft is connected to a power mechanism and its rotation speed is controlled by a controller; multiple axial loading cylinders are arranged along the circumference of the bearing to be tested to apply axial loading force to the outer ring of the bearing; a temperature sensor in contact with the outer ring of the bearing is provided on the base; and a pressure sensor for measuring the loading pressure is connected to the axial loading cylinder; the output signals of the temperature sensor and the pressure sensor are connected to a data acquisition unit; the data acquisition unit has a timing unit and a storage unit for associating and saving the temperature value measured by the temperature sensor with the time value of the timing unit.
[0006] The storage unit is used to save the spindle speed value and the loading pressure value of the axial loading cylinder, and associates and saves them with the temperature value measured by the temperature sensor.
[0007] The rodless chamber oil supply line of the axial loading cylinder is connected to a pressure sensor for measuring the oil pressure in the rodless chamber of the axial loading cylinder; the data acquisition unit receives the measured value from the pressure sensor and uses it to calculate the loading pressure value based on the measured value and the piston area of the axial loading cylinder.
[0008] One end of the main shaft is connected to a retaining ring for pressing and fixing the inner ring of the bearing to be tested. The main shaft is provided with a positioning step that cooperates with the retaining ring to press and fix the inner ring of the bearing to be tested.
[0009] The retaining ring is installed at one end of the spindle via a threaded connection.
[0010] The base is provided with a bearing housing, and the bearing to be tested is installed in the bearing housing. The bearing housing has an assembly hole that connects to the outer ring of the bearing to be tested in the bearing housing. A temperature sensor is set in the assembly hole and contacts the outer ring of the bearing to be tested to measure the temperature of the outer ring of the bearing to be tested.
[0011] The base is provided with a bearing seat, and the bearing to be tested is installed in the bearing seat. A cylinder bracket for installing an axial loading cylinder is fixed on one side of the bearing seat. The piston rod of the axial loading cylinder passes through the bearing seat and applies an axial loading force to the outer ring of the bearing to be tested.
[0012] The cylinder bracket has a fixed part for connecting the bearing seat and a support part extending outward from the fixed part for mounting the axially loaded cylinder. The fixed part and the support part are provided with a central hole for the main shaft to pass through.
[0013] The power mechanism is a variable frequency motor, which is connected to the main shaft via a coupling.
[0014] The beneficial effects of this invention are: the test data acquisition device can store the temperature value of the continuously changing outer ring of the bearing detected during the test in relation to time in the storage unit. By collecting and storing relevant data through this data acquisition device, the data from multiple tests of the bearing's limit speed can be integrated, thereby facilitating the acquisition of the correlation between bearing temperature change and time through relevant historical test data. This helps to solve the problem that each time the bearing parameters are adjusted, an independent repeated test is required, resulting in an excessively long overall test time. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model.
[0016] Figure 2 This is a circuit connection diagram of the data acquisition part of this utility model.
[0017] The markings in the diagram are: 1. Power mechanism, 2. Coupling, 3. Temperature sensor, 4. Bearing under test, 5. Axial loading cylinder, 6. Snap ring, 7. Main shaft, 8. Base, 9. Pressure sensor, 10. Controller, 11. Data acquisition unit, 12. Timing unit, 13. Storage unit, 14. Bearing housing, 15. Cylinder bracket. Detailed Implementation
[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. The specific contents listed in the following embodiments are not limited to the technical features necessary to solve the technical problem described in the claims. Furthermore, the listed embodiments are merely a part of this utility model, and not all of them.
[0019] like Figure 1 As shown, the bearing limit speed test data acquisition device of this utility model includes a base 8, a main shaft 7, a power mechanism 1, and an axial loading cylinder 5. A bearing housing 14 is provided on the base 8, and the bearing 4 to be tested is installed inside the bearing housing. The main shaft 7 passes through the bearing 4 to be tested and engages with the inner ring of the bearing 4. The main shaft 7 is connected to the power mechanism 1 via a coupling 2, and is used to drive the inner ring of the bearing 4 to rotate. The bearing 4 to be tested engages with one end of the main shaft 7. A positioning step is provided on the main shaft to abut against the inner ring of the bearing 4. A retaining ring 6 is connected to one end of the main shaft 7, and the retaining ring 6 abuts against one side of the inner ring of the bearing 4 to cooperate with the positioning step to press and fix the inner ring of the bearing 4. The retaining ring 6 can be threaded onto one end of the main shaft 7. The position of the retaining ring 6 can be adjusted by threading to adapt to the testing requirements of bearings of different widths.
[0020] Figure 1 In the illustrated embodiment, the base 8 is provided with two bearing seats. One bearing seat 14, closer to the power mechanism 1, is used to assemble the bearing 4 to be tested. The other set of bearing seats is used to support the spindle 7 through bearings, maintaining the force balance at both ends of the spindle 7. The power mechanism 1 that drives the spindle 7 to rotate can be a variable frequency motor, whose speed is controlled by a controller, so that the spindle 7 can drive the inner ring of the bearing 4 to be tested to rotate at a set speed to detect the temperature rise of the bearing at that speed.
[0021] The bearing 4 under test is an angular contact ball bearing. Multiple axial loading cylinders 5 are arranged on one side of the bearing 4, evenly distributed along the circumference of the bearing 4, and are used to apply axial loading force to the outer ring of the bearing. Figure 1As shown, a cylinder bracket 15 is fixed to one side of the bearing housing. The cylinder bracket 15 has a fixed part and a supporting part extending to one side from the fixed part. The fixed part is fixedly connected to the bearing housing 14 by bolts, and the extending part extends towards one side of the bearing housing. The axial loading cylinder 5 is mounted on the extending part. Both the fixed part and the supporting part are annular and are connected by a connecting pipe or spaced connecting strips. A central hole for the main shaft 7 to pass through is provided in the center of both the fixed part and the supporting part, so that the cylinder bracket 15 and the rotating main shaft 7 will not interfere. The piston rod of the axial loading cylinder 5 passes through the bearing housing and applies an axial loading force to the outer ring of the bearing 4 under test. With this structure, multiple axial loading cylinders can be evenly arranged around the main shaft 7 to apply axial load to the outer ring of the bearing under test, avoiding uneven loading. Moreover, compared with the usual method of applying axial load through the main shaft 7, the influence of the power mechanism on the main shaft can be avoided, and the load control is more accurate.
[0022] The axial loading cylinder 5 is equipped with a pressure sensor for measuring the loading pressure. This pressure sensor can be connected to the oil supply line of the rodless chamber of the axial loading cylinder 5 to measure the oil pressure in the rodless chamber. By measuring the oil pressure, the axial loading force applied by the axial loading cylinder 5 to the outer ring of the bearing under test can be indirectly obtained, which can solve the problem that the installation position of the bearing under test 4 is limited by space and it is inconvenient to install a pressure sensor.
[0023] like Figure 1 As shown, a temperature sensor 3 is provided on the bearing housing 14 of the base 8, which is in contact with the outer ring of the bearing. The temperature sensor 3 is set in the mounting hole on the bearing housing 14. The mounting hole is connected from the outside of the bearing housing 14 to the outer ring of the bearing 4 to be tested in the bearing housing, so that the temperature sensor 3 set in the mounting hole can contact the outer ring of the bearing to be tested, and can monitor the temperature of the outer ring of the bearing to be tested in real time.
[0024] like Figure 2 As shown, the output signals of temperature sensor 3 and pressure sensor 9 are connected to data acquisition unit 11, and controller 10 is also connected to data acquisition unit 11 to transmit the control value of spindle speed 7 to data acquisition unit 11. Pressure sensor 9 measures a value that indirectly reflects the loading pressure, which is transmitted to data acquisition unit 11. Data acquisition unit 11 calculates the loading pressure value based on the measured value and the piston area of axial loading cylinder. The real-time monitored loading pressure value is also transmitted to controller 10, which controls axial loading cylinder 5 to apply a predetermined axial loading force to the outer ring of the bearing under test.
[0025] The data acquisition unit includes a timing unit 12 and a storage unit 13. The timing unit 12 can be a timer that starts timing from the rotation of the spindle 7 and is used to generate time parameters in the data acquisition unit. The storage unit 13 is used to store the temperature values measured by the temperature sensor, the loading pressure values of the axial loading cylinder, and the rotational speed of the spindle 7. The temperature values stored in the storage unit 13 are categorized and stored according to different spindle speeds and different loading pressure values to record the temperature changes of the bearing under test under different speeds and loading pressures. Each category of temperature value is stored in association with the time value of the timing unit. The specific storage format for the association between temperature and time values, and the method for associating the time value with the measured temperature value in the data acquisition unit, can be found in existing technologies and will not be described in detail here.
[0026] During use, the bearing limit speed test data acquisition device uses a controller to apply a certain axial load to the bearing under test via a loading cylinder. The power mechanism 1 controls the spindle 7 to increase its speed in stages, for example, every 60 minutes. This time interval is set according to the time required for the bearing under test to reach a stable temperature at a given speed, ensuring that the bearing's temperature gradually stabilizes before moving to the next speed. The speed increases from low to high, with the speed difference set as needed, for example, an interval of 600 to 1800 r / min between each stage. To prevent large temperature fluctuations at higher speeds, the speed increase can be larger at lower speeds and smaller at higher speeds. Throughout the process, the axial load remains constant. The temperature sensor automatically collects the temperature value of the bearing's outer ring and transmits it to the data acquisition unit. The data acquisition unit then obtains a series of data showing the bearing's temperature change with speed and time. Based on this data, a temperature rise curve for the bearing can be fitted. Using this temperature rise curve, the bearing speed can be estimated based on temperature and time, or vice versa, guiding bearing design and testing and improving bearing testing efficiency.
[0027] The above description of specific embodiments is only for the purpose of helping to understand the technical concept and core idea of this utility model. Although specific preferred embodiments have been used to describe and illustrate the technical solution, they should not be construed as limiting the utility model itself. Those skilled in the art can make various changes in form and detail without departing from the technical concept. These easily conceived changes or substitutions should all be covered within the protection scope of this utility model.
Claims
1. A bearing limit speed test data acquisition device, comprising a base (8) for fixing a bearing to be tested (4) and a main shaft (7) penetrating through the bearing to be tested for driving rotation of the inner ring of the bearing to be tested; the main shaft is connected with a power mechanism (1) and its rotation speed is controlled by a controller; a plurality of axial loading cylinders (5) for applying axial loading force to the outer ring of the bearing are arranged along the circumferential direction of the bearing to be tested (4) on one side of the bearing to be tested, characterized in that: A temperature sensor (3) is arranged on the base (8) to contact the outer ring of the bearing, and an axial loading oil cylinder (5) is connected with a pressure sensor (9) for measuring the loading pressure; the output signals of the temperature sensor (3) and the pressure sensor (9) are connected to a data acquisition unit (11); the data acquisition unit has a timing unit (12) and a storage unit (13) for associatively storing the temperature value measured by the temperature sensor and the time value of the timing unit.
2. A bearing limit speed test data acquisition device as claimed in claim 1, characterized in that: The storage unit (13) is used to store the rotating speed value of the main shaft (7) and the loading pressure value of the axial loading oil cylinder (5), and associatively store the temperature value measured by the temperature sensor (3).
3. A bearing limit speed test data acquisition device as set forth in claim 1, characterized by: A pressure sensor (9) for measuring the oil pressure in the rodless cavity of the axial loading oil cylinder is connected to the oil supply pipeline of the rodless cavity of the axial loading oil cylinder (5); the data acquisition unit (11) receives the measurement value of the pressure sensor (9), and is used to calculate the loading pressure value according to the measurement value and the piston area of the axial loading oil cylinder.
4. A bearing limit speed test data acquisition device as set forth in claim 1, characterized by: One end of the main shaft (7) is connected with a snap ring (6) for pressing and fixing the inner ring of the bearing (4) to be measured, and a positioning step for cooperating with the snap ring to press and fix the inner ring of the bearing to be measured is arranged on the main shaft.
5. A bearing limit speed test data acquisition apparatus as claimed in claim 4, wherein: The snap ring (6) is installed at one end of the main shaft (7) through threaded cooperation.
6. A bearing limit speed test data acquisition device as set forth in claim 1, characterized by: The base (8) is provided with a bearing seat (14), and the bearing (4) to be measured is installed in the bearing seat; an assembly hole is arranged on the bearing seat (14) and communicates with the outer ring of the bearing (4) to be measured in the bearing seat, and the temperature sensor (3) is arranged in the assembly hole and contacts the outer ring of the bearing to be measured to measure the temperature of the outer ring of the bearing to be measured.
7. A bearing limit speed test data acquisition device as set forth in claim 1, characterized by: The base (8) is provided with a bearing seat (14), and the bearing (4) to be measured is installed in the bearing seat; an assembly hole is arranged on the bearing seat (14) and communicates with the outer ring of the bearing (4) to be measured in the bearing seat, and the temperature sensor (3) is arranged in the assembly hole and contacts the outer ring of the bearing to be measured to measure the temperature of the outer ring of the bearing to be measured.
8. A bearing limit speed test data acquisition device as in claim 7, wherein: The oil cylinder support (15) has a fixed part for connecting the bearing seat (14) and a support part extending outward from the fixed part for installing the axial loading oil cylinder, and a center hole for the main shaft (7) to pass through is arranged at the center of the fixed part and the support part.
9. A bearing limit speed test data acquisition apparatus as set forth in claim 1, characterized by: The power mechanism (1) is a variable frequency motor connected with the main shaft (7) through a shaft coupling (2).