A CRB bearing clearance measuring device

Abstract

A CRB bearing clearance measuring device, belonging to the technical field of CRB bearing testing equipment, includes a base, a positioning component, a loading component, a testing component, and a control module. The base serves as the supporting foundation for the entire device. The positioning component is used to precisely fix the CRB bearing, ensuring its stable position during measurement. The loading component can apply precise and controllable radial and axial loading forces to the bearing. The testing component is responsible for measuring the displacement changes of the bearing under the loading force in real time, thereby obtaining clearance data. The control module automates the entire measurement process and realizes the display, storage, and transmission of data.

Description

Technical Field

[0001] This utility model belongs to the technical field of CRB bearing testing equipment, specifically relating to a CRB bearing clearance measuring device. Background Technology

[0002] As a high-precision bearing, the internal clearance of CRB bearings directly affects their rotational accuracy, load-bearing capacity, and service life. Therefore, clearance measurement is a crucial inspection step during production, assembly, and maintenance. Currently, CRB bearing clearance measurement is mostly performed manually using tools such as dial indicators or micrometers, or with complex general-purpose bearing measuring equipment.

[0003] The manual measurement method has the following drawbacks: First, the measurement accuracy is heavily dependent on the operator's experience and skills, resulting in significant human error and making it difficult to ensure the consistency of measurement results; second, the measurement efficiency is low and cannot meet the testing requirements of mass production; third, when applying measurement force manually, uneven force control can easily cause unnecessary damage to the bearing and also lead to distorted measurement data.

[0004] While general-purpose bearing measuring equipment can improve accuracy to some extent, it suffers from a lack of specificity: CRB bearings employ a cross-arranged roller structure, and their clearance measurement has specific requirements for the direction of force and positioning accuracy. General-purpose equipment cannot accurately match the structural characteristics of CRB bearings, resulting in limited measurement accuracy. In addition, general-purpose equipment is bulky, complex to operate, expensive, and has a long debugging cycle, making it inconvenient for rapid application in production lines or on-site maintenance. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a CRB bearing clearance measuring device. This device addresses the problems of low accuracy, poor efficiency, and insufficient specificity in existing CRB bearing clearance measurement methods mentioned in the background section. It provides accurate and rapid measurement of CRB bearing clearance while simplifying the operation process and reducing usage costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a CRB bearing clearance measuring device, comprising a base, a positioning component, a loading component, a detection component, and a control module; The base is a horizontal load-bearing structure, and its upper surface is a mounting plane for fixing the components. The positioning assembly includes a centering seat, radial positioning blocks, and an axial pressure plate. The centering seat is fixed to the center of the base mounting plane, and its outer circle is adapted to the inner ring of the CRB bearing for centering and positioning the inner ring of the bearing. There are three radial positioning blocks, which are evenly distributed on the base with the centering seat axis as the center. Their inner sides are provided with arc-shaped surfaces adapted to the outer ring of the CRB bearing. They are radially extended and retracted by a cylinder for radial positioning of the outer ring of the bearing. The axial pressure plate is set above the centering seat by a column, and a pressure sensor is provided at its bottom. It is axially raised and lowered by a hydraulic cylinder for axially pressing and positioning the bearing. The loading assembly includes a radial loading unit and an axial loading unit. The radial loading unit is symmetrically arranged on both sides of the centering seat and includes a loading rod, a force sensor, and a servo motor. The end of the loading rod is provided with an arc-shaped pressure head adapted to the bearing roller. The servo motor drives the loading rod to move radially through a ball screw. The force sensor is set between the loading rod and the ball screw to detect the loading force in real time. The axial loading unit is integrated with the axial pressure plate. The pressure of the axial pressure plate is adjusted by a hydraulic cylinder to achieve axial loading. The detection assembly includes a displacement sensor and a data acquisition module. The displacement sensor includes a radial displacement sensor and an axial displacement sensor. The radial displacement sensor is fixed on the loading rod of the radial loading unit and is used to detect the radial displacement of the outer ring of the bearing relative to the inner ring. The axial displacement sensor is fixed below the axial pressure plate and is used to detect the axial displacement of the outer ring of the bearing relative to the inner ring. The data acquisition module is electrically connected to the force sensor, displacement sensor, and pressure sensor and is used to acquire data from each sensor in real time. The control module includes a PLC controller and a touch screen display. The PLC controller is electrically connected to the servo motor, cylinder, hydraulic cylinder, and data acquisition module, and is used to control the actions of each actuator and process data. The touch screen display is electrically connected to the PLC controller and is used for parameter setting, action control, and measurement data display.

[0007] The centering seat has a detachable positioning sleeve on its outer circle. The outer diameter of the positioning sleeve is designed to match the inner ring size of different CRB bearing models. By replacing the positioning sleeve, the measurement and adaptation of bearings of different specifications can be achieved.

[0008] The radial positioning block has a wear-resistant bushing on its arc-shaped surface. The bushing is made of polytetrafluoroethylene material to prevent scratches on the outer ring surface of the bearing during the positioning process.

[0009] Both the radial and axial displacement sensors are laser displacement sensors with a measurement accuracy of ±0.001mm, ensuring the high precision required for clearance measurement.

[0010] The control module also includes a data storage unit and a communication interface. The data storage unit is used to store measurement data and parameter settings, and the communication interface supports Ethernet communication to enable the uploading of measurement data and remote control.

[0011] The beneficial effects of this utility model are as follows: Precise bearing positioning is achieved through the combination of a centering seat and a radial positioning block; displacement detection is performed using a laser displacement sensor, with a measurement accuracy of ±0.001mm; simultaneously, the loading force is fed back in real time by a force sensor, and the loading process is precisely controlled by a PLC controller, avoiding measurement errors caused by fluctuations in loading force and effectively improving the accuracy of clearance measurement; automated control of the entire bearing positioning, loading, and testing process is realized; operators only need to complete parameter settings and start operations through a touch screen display, reducing the measurement time for a single bearing to less than 30 seconds, improving efficiency by 5-8 times compared to manual measurement, meeting the testing needs of mass production; by replacing the detachable positioning sleeve and adjusting the extension range of the radial positioning block, it can be adapted to measure different models and specifications of CRB bearings, eliminating the need for separate measuring equipment for each bearing specification and reducing equipment investment costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a top view of the structure of this utility model.

[0014] In the diagram: 1. Base, 2. Centering seat, 3. Radial positioning block, 4. Axial pressure plate, 5. Cylinder, 6. Column, 7. Hydraulic cylinder, 8. Servo motor, 9. Loading rod, 10. Arc-shaped pressure head, 11. Control module. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Please refer to the figure. Figure 1 , Figure 2As shown, a CRB bearing clearance measuring device includes a base 1, a positioning component, a loading component, a detection component, and a control module. The base 1 is made of cast iron, with leveling feet at the bottom and a high-precision mounting surface machined on the top to ensure the flatness of each component. The base 1 serves as the supporting foundation for the entire device, providing a stable mounting platform for the other components. The positioning component is used to precisely fix the CRB bearing, ensuring its stable position during measurement. The loading component can apply precise and controllable radial and axial loading forces to the bearing, simulating the stress state of the bearing in actual operation. The detection component is responsible for measuring the displacement change of the bearing under the loading force in real time, thereby obtaining clearance data. The control module 11 automates the entire measurement process and realizes the display, storage, and transmission of data. The modules cooperate with each other to accurately measure the CRB bearing clearance.

[0017] The positioning assembly includes a centering seat 2, radial positioning blocks 3, and an axial pressure plate 4. The centering seat 2 is fixed to the center of the mounting plane of the base 1 by bolts. A positioning sleeve is fitted on its outer circle. The positioning sleeve is interference-fitted with the inner ring of the CRB bearing to achieve centering of the inner ring of the bearing. There are three radial positioning blocks 3, which are evenly distributed at 120° with the axis of the centering seat 2 as the center. Their outer sides are connected to the piston rod of the cylinder 5. The cylinder 5 is fixed on the base 1. A wear-resistant bushing is fixed to the inner side of the radial positioning block 3 by bolts. The arc-shaped surface of the inner side of the wear-resistant bushing is adapted to the outer ring of the CRB bearing. The axial pressure plate 4 is fixed above the centering seat 2 by a column 6. The top of the axial pressure plate 4 is connected to the piston rod of the hydraulic cylinder 7. The hydraulic cylinder 7 is fixed on the crossbeam at the top of the column 6. A pressure sensor is embedded in the center of the bottom of the axial pressure plate 4. The loading assembly includes a radial loading unit and an axial loading unit. The radial loading unit is symmetrically arranged on both sides of the centering base 2 and includes a loading rod 9, a force sensor, a servo motor 8, and an arc-shaped pressure head 10. The servo motor 8 is fixed to the base 1 by a motor mount. The output shaft of the servo motor 8 is connected to a ball screw. The nut of the ball screw is fixedly connected to the loading rod 9. The force sensor is connected in series between the loading rod 9 and the nut of the ball screw. The arc-shaped pressure head 10 is threaded to the end of the loading rod 9, and its arc-shaped surface is adapted to the roller of the CRB bearing. The axial loading unit is integrated with the axial pressure plate 4. The axial pressure plate 4 is driven by a hydraulic cylinder 7 to apply axial pressure, thereby achieving axial loading. The detection assembly includes displacement sensors and a data acquisition module. The displacement sensors include radial displacement sensors and axial displacement sensors, both of which are laser displacement sensors. The radial displacement sensor is fixed to the loading rod 9 by a bracket, and its detection direction is towards the side of the outer ring of the CRB bearing. The axial displacement sensor is located below the axial pressure plate 4, and its detection direction is towards the upper end face of the outer ring of the CRB bearing. The data acquisition module uses a multi-channel data acquisition card, and its input terminals are connected to the force sensor, pressure sensor, radial displacement sensor, and axial displacement sensor respectively through signal lines. The control module includes a PLC controller and a touch screen display. The PLC controller is a Siemens S7, 1200 series PLC, located in the electrical control box 11 on the surface of the base 1. Its input terminal is connected to the output terminal of the data acquisition module, and its output terminal is connected to the control terminals of the servo motor 8, cylinder 5, and hydraulic cylinder 7, respectively. The touch screen display is a 10-inch industrial touch screen, fixed on the front of the electrical control box 11, and connected to the PLC controller via Ethernet communication. The electrical control box 11 also has a data storage unit and a communication interface. The data storage unit uses an SD card and is connected to the PLC controller. The communication interface uses an RJ45 interface and extends to the outside of the electrical control box.

[0018] The working process of this embodiment is as follows: 1. Adaptation and Adjustment: Replace the corresponding locating sleeve according to the model of the CRB bearing to be measured, and ensure that the locating sleeve is adapted to the inner ring of the bearing; set the measurement parameters through the touch screen, including radial loading force, axial clamping force, number of measurements, etc. 2. Bearing loading: Place the CRB bearing onto the positioning sleeve of the centering seat 2, so that the inner ring of the bearing fits against the positioning sleeve; 3. Positioning and clamping: The operator starts the positioning program through the touch screen. The PLC controller controls the cylinder 5 to move, driving the three radial positioning blocks 3 to retract synchronously towards the center until the wear-resistant bushing is in contact with the outer ring of the bearing, thus achieving radial positioning. Then, the hydraulic cylinder 7 is controlled to move, driving the axial pressure plate 4 to descend until it contacts the upper end face of the outer ring of the bearing. The pressure sensor detects the clamping force in real time. When the set value is reached, the hydraulic cylinder 7 stops moving, thus achieving axial clamping. 4. Loading Measurement: The PLC controller starts the servo motors 8 of the radial loading units on both sides, driving the loading rods 9 towards the bearing via ball screws. After the arc-shaped pressure head 10 contacts the bearing rollers, loading continues. The force sensor provides real-time feedback of the loading force. When the set radial loading force is reached, the servo motors 8 stop loading. At this time, the radial displacement sensor detects the radial displacement of the bearing outer ring relative to the inner ring, and the axial displacement sensor detects the axial displacement. The data acquisition module collects the displacement and force data and transmits them to the PLC controller. The PLC controller calculates the bearing clearance (radial clearance is the difference in radial displacement, and axial clearance is the difference in axial displacement) based on the collected displacement data. 5. Data Processing: The PLC controller compares the calculated clearance value with the preset standard value to determine whether the bearing clearance is qualified, and stores the measurement data, qualified status and measurement time in the data storage unit; at the same time, the measurement results are displayed on the touch screen. 6. Unloading and feeding: After the measurement is completed, the PLC controller controls the radial loading unit to reset, and then controls the axial pressure plate 4 to rise and the radial positioning block 3 to reset. The operator removes the bearing to complete one measurement process.

[0019] In this embodiment, measurement data can be uploaded to the workshop MES system via a communication interface to achieve centralized data management; at the same time, it supports querying historical measurement data through a touch screen, which facilitates quality traceability.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0021] The parts of this utility model not described in detail are existing technologies.

Claims

1. A CRB bearing clearance measuring device, characterized in that: Includes a base (1), a positioning component, a loading component, a detection component, and a control module; The base (1) is a horizontal load-bearing structure, and its upper surface is a mounting plane for fixing the components. The positioning assembly includes a centering seat (2), a radial positioning block (3), and an axial pressure plate (4). The centering seat (2) is fixed to the center of the mounting plane of the base (1), and its outer circle is adapted to the inner ring of the CRB bearing to achieve centering and positioning of the inner ring of the bearing. There are three radial positioning blocks (3), which are evenly distributed on the base (1) with the axis of the centering seat (2) as the center. The inner side of the block is provided with an arc-shaped surface adapted to the outer ring of the CRB bearing. The block is driven by a cylinder (5) to achieve radial extension and retraction, and is used for radial positioning of the outer ring of the bearing. The axial pressure plate (4) is set above the centering seat (2) by a column (6). The bottom of the plate is provided with a pressure sensor. The plate is driven by a hydraulic cylinder (7) to achieve axial lifting and lowering, and is used to axially press and position the bearing. The loading assembly includes a radial loading unit and an axial loading unit. The radial loading unit is symmetrically arranged on both sides of the centering seat (2) and includes a loading rod (9), a force sensor and a servo motor (8). The end of the loading rod (9) is provided with an arc-shaped pressure head (10) adapted to the bearing roller. The servo motor (8) drives the loading rod (9) to move radially through a ball screw. The force sensor is set between the loading rod (9) and the ball screw to detect the loading force in real time. The axial loading unit is integrated with the axial pressure plate (4). The pressure of the axial pressure plate is adjusted by a hydraulic cylinder (7) to achieve axial loading. The detection component includes a radial displacement sensor, an axial displacement sensor, and a data acquisition module; The control module is located in the electrical control box (11) on the surface of the base (1), and includes a PLC controller and a touch screen. The PLC controller is electrically connected to each actuator and sensor.

2. The CRB bearing clearance measuring device according to claim 1, characterized in that: The centering seat (2) has a detachable positioning sleeve on its outer circle. The outer diameter of the positioning sleeve is designed to match the inner ring size of the CRB bearing.

3. The CRB bearing clearance measuring device according to claim 1, characterized in that: The radial positioning block (3) has a wear-resistant bushing on its inner side. The wear-resistant bushing is made of polytetrafluoroethylene material and has an arc-shaped surface on its inner side that is compatible with the outer ring of the CRB bearing.

4. The CRB bearing clearance measuring device according to claim 1, characterized in that: Both the radial displacement sensor and the axial displacement sensor are laser displacement sensors with a measurement accuracy of ≥ ±0.001 mm.

5. The CRB bearing clearance measuring device according to claim 1, characterized in that: The control module also includes a data storage unit and a communication interface. The data storage unit is used to store measurement data, and the communication interface supports Ethernet communication.

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