Dynamic load testing device for motor bearing based on double-shaft coupling

Abstract

The application discloses a motor bearing dynamic load testing device based on double-shaft coupling and relates to the technical field of bearing testing. The device is obviously different from the conventional bearing load testing mode in that a semi-linkage structure is formed by a power output shaft, a joint shaft and a power detection shaft, the semi-linkage structure is convenient for the acquisition process of subsequent rotation parameters, the accurate testing of the dynamic load of the motor bearing is realized through the cooperative work of a first sliding table, a second sliding table and a third sliding table, the design of the semi-linkage structure makes the power output and detection more flexible, the response characteristics of the motor bearing under different load conditions are accurately captured, the setting of multiple detection components and an axial polarization detection component further improves the comprehensiveness and accuracy of the testing, the active intervention of a pulse action component on a ball head rod simulates the working state of the motor bearing in different action environments, the pulse action component provides strong support for the performance evaluation and optimization of the motor bearing, and the accuracy of the testing data in the testing process is improved.

Description

Technical Field

[0001] This invention relates to the field of bearing testing technology, and more specifically to a dynamic load testing device for motor bearings based on dual-axis coupling. Background Technology

[0002] Referring to the relevant content in publication number CN107543707A, the testing process for motor bearings is explained as follows: the upper limit of bearing operation is obtained by simulating the working environment. Considering its structural characteristics, the inner and outer rings must maintain two states: the inner ring rotates while the outer ring is fixed, or the inner ring is fixed while the outer ring rotates. Therefore, the bearing testing focuses mainly on speed characteristics, temperature index, and vibration characteristics.

[0003] It should be further explained that the core value of the testing process lies in simulating different working environments. However, the actual operation of motor bearings mainly involves loads in both axial and radial directions. The "force-force coordination" and "force-speed coordination" of radial and axial loads are prone to deviation, which directly affects the realism of the load simulation. Specifically, when applying radial load to the test bearing, installation deviation of the loading mechanism may lead to additional axial component force, and conversely, axial loading may also introduce radial interference force. In addition, if the loading point is not collinear with the geometric center of the bearing, an additional bending moment will be generated, causing the bearing to bear the combined effect of "preset load + additional torque".

[0004] Furthermore, in situations such as sudden motor stoppage or load change, the response speeds of the radial and axial loading systems are inconsistent (e.g., hydraulic loading response is slower than electromagnetic loading), resulting in a time difference between the "set biaxial load ratio" and the "actual ratio acting on the bearing." This can affect the accuracy of test data and exacerbate irreversible damage to the motor output shaft and roller shaft. To address this, the present invention proposes a solution. Summary of the Invention

[0005] The purpose of this invention is to provide a dynamic load testing device for motor bearings based on dual-axis coupling, which addresses the situation where the difference in load and response time in the axial and radial directions during motor bearing testing directly affects the accuracy of test data or may cause irreversible damage to the motor spindle and bearings.

[0006] The objective of this invention can be achieved through the following technical solution: a dynamic load testing device for motor bearings based on dual-axis coupling, comprising a working platform and a first slide, a second slide, and a third slide arranged sequentially along its length, wherein the second slide serves as the motor bearing fixing position, the first slide serves as the power output position, and the third slide serves as the power detection position;

[0007] An assembly consisting of a power detection shaft, a connector shaft, and a power output shaft is provided between the first slide and the third slide. The connector shaft is connected to the inner bushing in the motor bearing, and the two ends of the connector shaft form a semi-linkage structure consisting of pin blocks and pin grooves between the power detection shaft and the power output shaft.

[0008] The second slide is equipped with multiple detection components corresponding to the outer bushing of the motor bearing, an axial polarization detection component corresponding to the inner bushing of the motor bearing, and a clamping seat for fixing the motor bearing.

[0009] The configuration is further defined as follows: a power motor corresponding to the power output shaft is provided on the first slide, and a rotary encoder component corresponding to the power detection shaft is provided on the third slide.

[0010] A further configuration is provided: a retaining ring sleeve is fitted on the outer position of the semi-linkage structure corresponding to the joint shaft, the power detection shaft, and the power output shaft.

[0011] The configuration is further improved so that axial clearance is provided at one end of the pin block corresponding to the pin groove and at one end of the connector shaft corresponding to the power detection shaft and the power output shaft.

[0012] The pin blocks are further configured in a circular array along the center point of the joint axis, and the arc length of the pin blocks is less than the arc length of the pin groove. Radial springs are provided at both ends of the pin blocks corresponding to the arc length direction of the pin groove.

[0013] The radial spring is further configured as follows: the radial spring consists of two straight plates and an arc-shaped spring plate disposed between the two straight plates. The arc-shaped spring plate is linearly and equidistantly arranged along the length direction of the straight plates, and the two straight plates are arranged along the arc length direction of the pin block.

[0014] Further configuration: concave annular grooves are provided on the outer wall positions of both ends of the motor bearing corresponding to the joint shaft, and concave locking blocks are provided on the conductive end positions of the axial polarization component at positions corresponding to the concave annular groove structure contours.

[0015] The concave block is further configured such that it moves in a relatively horizontal direction relative to the connector shaft along the length of the working platform, and the contact surface between the concave block and the concave annular groove is provided with multiple balls.

[0016] The configuration is further defined as follows: a ball joint rod corresponding to the length direction of the working platform is provided at the center point of the power detection shaft, one end of the ball joint rod is spherical and matches the center point of one end of the connector shaft, and a pulse action component corresponding to the other end of the ball joint rod is provided on the third slide.

[0017] The present invention has the following beneficial effects:

[0018] 1. During the testing process, the power motor drives the power output shaft to rotate. The power is transmitted to the connector shaft through the semi-linkage structure of the pin block and pin groove, which in turn drives the inner bushing of the motor bearing to rotate. Multiple detection components and the axial polarization detection component work synchronously to accurately capture parameters such as vibration, temperature and axial polarization of the bearing under different load conditions. The pulse action component applies intermittent impacts to the connector shaft through the ball joint rod to simulate the sudden load changes encountered by the motor bearing in actual working conditions, effectively improving the comprehensiveness and authenticity of the test data. The setting of the retaining ring sleeve and radial spring not only ensures the stability of the semi-linkage structure, but also reduces the impact of mechanical friction on the test results through the axial clearance design. The ball joint structure of the concave retaining block and concave ring groove further reduces the resistance in the axial polarization detection process, ensuring the accuracy of the detection data. This device can more realistically reproduce the working environment of the motor bearing and provide reliable data support for bearing performance evaluation and optimization.

[0019] 2. In addition to the above, it should be noted that the method differs significantly from conventional bearing load testing in that it uses a semi-linkage structure formed by the power output shaft, connector shaft, and power detection shaft. This facilitates the acquisition of subsequent rotational parameters. Furthermore, to optimize the connection process of the power output shaft, connector shaft, and power detection shaft, the coordinated operation of the first, second, and third slides is optimized, providing strong support for the performance evaluation and optimization of motor bearings and improving the accuracy of test data during the testing process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the dynamic load testing device for motor bearings based on dual-axis coupling proposed in this invention.

[0022] Figure 2 For the present invention Figure 1 The front view;

[0023] Figure 3 This is a split view of the power output shaft and the connector shaft in this invention;

[0024] Figure 4 In this invention Figure 4 Lateral view;

[0025] Figure 5 This is a cross-sectional view between the power detection shaft and the connector shaft in this invention;

[0026] Figure 6 This is a schematic diagram of the structure of the second slide in this invention.

[0027] In the diagram: 1. Working platform; 2. First slide; 3. Second slide; 4. Third slide; 5. Power motor; 6. Clamping shaft seat; 7. Power detection shaft; 8. Pulse action assembly; 9. Power output shaft; 10. Connector shaft; 11. Axial polarization detection structure; 12. Rotary encoder assembly; 13. Concave clamping block; 14. Clamping ring sleeve; 15. Concave annular groove; 16. Pin groove; 17. Pin block; 18. Radial spring; 19. Ball joint rod. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1: To address the issue that differences in load and response time in the axial and radial directions during motor bearing testing directly affect the accuracy of test data and may even cause irreversible damage to the motor shaft and bearings, this example proposes the following technical solutions:

[0030] Reference Figures 1-6 The dynamic load testing device for motor bearings based on dual-axis coupling in this embodiment includes a working platform 1 and a first slide 2, a second slide 3 and a third slide 4 arranged sequentially along its length direction. The second slide 3 serves as the motor bearing fixing position, the first slide 2 serves as the power output position, and the third slide 4 serves as the power detection position.

[0031] An assembly consisting of a power detection shaft 7, a connector shaft 10, and a power output shaft 9 is provided between the first slide 2 and the third slide 4. The connector shaft 10 is connected to the inner bushing in the motor bearing, and the two ends of the connector shaft 10 form a semi-linkage structure consisting of a pin block 17 and a pin groove 16 between the power detection shaft 7 and the power output shaft 9.

[0032] The second slide 3 is equipped with multiple detection components corresponding to the outer bushing of the motor bearing, an axial polarization detection component 11 corresponding to the inner bushing of the motor bearing, and a clamping seat 6 for fixing the motor bearing. The first slide 2 is equipped with a power motor 5 corresponding to the power output shaft 9, and the third slide 4 is equipped with a rotary encoder component 12 corresponding to the power detection shaft 7.

[0033] Technical Principle: A brief explanation of the load testing process for motor bearings: The motor is used as the power component to drive the inner ring of the motor bearing to rotate continuously, and relevant parameters of the outer ring are obtained, specifically including the temperature change and vibration frequency change of the outer ring. In the context of this invention, the motor 5 is used as the power component. After the motor bearing is fixed in the clamping seat 6, the power output shaft 9 connected to the motor 5 rotates at high speed in conjunction with the connector shaft 10. Multiple detection components are used to collect data parameters of the outer ring of the motor bearing, including the temperature change and vibration frequency change of the outer ring. The rotation parameters of the power detection shaft 7 are obtained by the rotary encoder 12 and compared with the output power of the motor 5 to obtain relevant data of the motor bearing.

[0034] In the conventional testing mode, the inner ring of the motor bearing and the power output shaft 9 connected to the power motor 5 are an integral structure. Therefore, when the output power / mode of the power motor 5 fluctuates, it is difficult to obtain more accurate test data using only a single power output shaft 9. The key content of this invention is that the power output shaft 9, the connector shaft 10, and the power detection shaft 7 form a relatively integrated main shaft. The power output shaft 9 is used to provide kinetic energy, while the power detection shaft 7 is used to obtain the rotational state of the inner ring of the motor bearing.

[0035] Example 2: Improvements to the connection method between the power detection shaft, power output shaft, and connector shaft:

[0036] A retaining ring sleeve 14 is fitted on the outer position of the semi-linkage structure corresponding to the joint shaft 10, the power detection shaft 7, and the power output shaft 9. An axial clearance is provided at one end of the pin block 17 corresponding to the pin groove 16 and at one end of the joint shaft 10 corresponding to the power detection shaft 7 and the power output shaft 9. The pin blocks 17 are arranged in a circular array along the center point of the joint shaft 10, and the arc length of the pin blocks 17 is less than the arc length of the pin groove 16. Radial springs 18 are provided at both ends of the pin blocks 17 corresponding to the arc length direction of the pin groove 16. The radial springs 18 are composed of two straight plates and an arc-shaped spring plate arranged between the two straight plates. The arc-shaped spring plate is arranged linearly and equidistantly along the length direction of the straight plates, and the two straight plates are arranged along the arc length direction of the pin blocks 17.

[0037] Solution Description: Refer to Figure 3 and Figure 4Explanation: The power output shaft 9 and the power detection shaft 7 are mainly linked to the connector main shaft 10 through the pin block 17 and the pin groove 16. However, the difference in arc length between the pin block 17 and the pin groove 16 is limited. It can be understood that the pin block 17 and the pin groove 16 are not completely locked. In the initial state, the pin block 17 is located in the middle position of the pin groove 16, and radial springs 18 are set on both sides of the pin block 17 corresponding to the pin groove 16. The radial springs 18 are essentially springs. When the power output shaft 9 moves counterclockwise or clockwise, it will continuously compress the radial springs 18 on one side until it reaches its maximum extent, which will synchronously drive the connector shaft 10 to rotate in a specific direction. When the connector shaft 10 rotates in a specific direction, the radial springs 18 on the other side will also be compressed in a specific direction until the power detection shaft 7 rotates.

[0038] To explain based on the above: When the power motor 5 drives the power output shaft 9 to rotate, and its rotation direction and speed change, since the connector shaft 10 mainly serves as a "connection structure" between the power output shaft 9 and the power detection shaft 7, the rotational state change of the inner ring of the motor bearing can be obtained by the rotary encoder 12. This part is one of the obvious differences from the conventional motor bearing load test process.

[0039] Example 3: The following improvement scheme is proposed for the dynamic detection shaft:

[0040] The connector shaft 10 is provided with concave annular grooves 15 on the outer wall of both ends of the motor bearing. The axial polarization component 11 is provided with a concave locking block 13 at the position corresponding to the structural outline of the concave annular groove 15. The concave locking block 13 moves horizontally relative to the connector shaft 10 along the length of the working platform 1. The contact surface between the concave locking block 13 and the concave annular groove 15 is provided with multiple balls. The center point of the power detection shaft 7 is provided with a ball head rod 19 corresponding to the length of the working platform 1. One end of the ball head rod 19 is spherical and matches the center point of one end of the connector shaft 10. The third slide 4 is provided with a pulse action component 8 corresponding to the other end of the ball head rod 19.

[0041] Solution Description: The bearing structure is described as follows: Most bearings involve a fixed outer ring and a rotating inner ring. When the power output shaft 9 continuously outputs radial rotational force, the inner ring may experience changes in axial force. Refer to [reference needed] for details. Figure 6 Explanation: The connector shaft 10 has concave annular grooves 15 symmetrically arranged along the thickness direction of the motor bearing, and multiple concave retaining blocks 13 are provided on the concave annular grooves 15, such as... Figure 6As shown, in order to obtain more realistic test data, the concave blocks 13 are distributed at 90° equidistant intervals to continuously perform directional testing in the four directions of up, down, left, and right. It is also necessary to ensure that the structural contours of the concave blocks 13 and the concave annular groove 15 are completely matched, so that when the connector shaft 10 rotates continuously, the concave blocks 13 cooperate with the balls to reduce frictional damage to the connector shaft 10.

[0042] However, in reality, if the inner ring of the motor bearing experiences directional horizontal displacement, it will further affect the relative position of the concave locking block 13. For this, refer to... Figure 6 The axial polarization detection component 11 is essentially similar to a displacement sensor and is mainly used to obtain the horizontal offset of the concave block 13. Its key purpose is to obtain the possible axial offset of the inner ring of the motor bearing when the rotation state of the power output shaft 9 changes.

[0043] In summary, the following points can be made: a ball joint rod 19 is added to the internal position of the power detection shaft 7 relative to the connector shaft 10 in a sliding manner. However, the ball joint rod 19 can form an integral structure with the connector shaft 10 through the ball structure at one end, but the ball joint rod 19 will not interfere with the rotation process of the connector shaft 10.

[0044] Reference Figure 5 It should be noted that during the actual load test, the pulse action component 8 can drive the ball joint 9 to move directionally along the length of the working platform 1. The pulse action component 8 is essentially an electromagnetic pulse structure. For example, a permanent magnet can be set at the other end of the ball joint 19. The pulse action component 8 contains an energized winding coil. In the two states of energization / de-energization, it can generate two states of magnetization or demagnetization with the permanent magnet. The purpose is to generate changes in the axial force of the inner ring of the motor bearing through active interference when the connector shaft 10 is rotating normally, so as to further simulate the working state in different operating environments. Specifically, it is manifested as: changing the rotation state of the power output shaft 9 to form radial force fluctuation, and forming axial force fluctuation through the ball joint 19.

[0045] The derivative part of the present invention is that the first slide 2, the second slide 3 and the third slide 4 can slide and be fixed on the working platform 1 in a directional manner, which is to facilitate the connection process of the connector shaft 10, the power detection shaft 7 and the power output shaft 9.

[0046] In summary, the coordinated operation of the first, second, and third slides enables precise testing of the dynamic load on motor bearings. The semi-linkage structure design allows for more flexible power output and testing, accurately capturing the response characteristics of motor bearings under different load conditions. The inclusion of multiple detection components and an axial polarization detection component further enhances the comprehensiveness and accuracy of the test. The active interference of the ball joint by the pulse action component simulates the working state of the motor bearing in different operating environments, providing strong support for the performance evaluation and optimization of motor bearings and improving the accuracy of test data during the testing process.

[0047] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dynamic load testing device for motor bearings based on dual-axis coupling, comprising a working platform (1) and a first slide (2), a second slide (3), and a third slide (4) arranged sequentially along its length, characterized in that, The second slide (3) is used as the motor bearing fixing position, the first slide (2) is used as the power output position, and the third slide (4) is used as the power detection position; An assembly consisting of a power detection shaft (7), a connector shaft (10), and a power output shaft (9) is provided between the first slide (2) and the third slide (4). The connector shaft (10) is connected to the inner bushing in the motor bearing, and the two ends of the connector shaft (10) form a semi-linkage structure consisting of a pin block (17) and a pin groove (16) between the power detection shaft (7) and the power output shaft (9). The second slide (3) is equipped with multiple detection components corresponding to the outer bushing of the motor bearing, an axial polarization detection component (11) corresponding to the inner bushing of the motor bearing, and a clamping seat (6) for fixing the motor bearing.

2. The dynamic load testing device for motor bearings based on dual-axis coupling according to claim 1, characterized in that, The first slide (2) is provided with a power motor (5) corresponding to the power output shaft (9), and the third slide (4) is provided with a rotary encoder assembly (12) corresponding to the power detection shaft (7).

3. The dynamic load testing device for motor bearings based on dual-axis coupling according to claim 1, characterized in that, A retaining ring sleeve (14) is fitted on the outer position of the semi-linkage structure corresponding to the joint shaft (10), the power detection shaft (7), and the power output shaft (9).

4. The dynamic load testing device for motor bearings based on dual-axis coupling according to claim 3, characterized in that, The pin block (17) is provided with an axial clearance at one end of the pin groove (16) and the connector shaft (10) is provided with an axial clearance at one end of the power detection shaft (7) and the power output shaft (9).

5. The dynamic load testing device for motor bearings based on dual-axis coupling according to claim 3, characterized in that, The pins (17) are arranged in a circular array along the center point of the joint shaft (10), and the arc length of the pins (17) is less than the arc length of the pin groove (16). Radial springs (18) are provided at both ends of the pins (17) corresponding to the arc length direction of the pin groove (16).

6. The dynamic load testing device for motor bearings based on dual-axis coupling according to claim 5, characterized in that, The radial spring (18) consists of two straight plates and an arc-shaped spring plate disposed between the two straight plates. The arc-shaped spring plate is linearly and equidistantly disposed along the length direction of the straight plates, and the two straight plates are disposed along the arc length direction of the pin block (17).

7. The dynamic load testing device for motor bearings based on dual-axis coupling according to claim 1, characterized in that, The connector shaft (10) is provided with concave annular grooves (15) on the outer wall positions corresponding to both ends of the motor bearing, and the axial polarization component (11) is provided with concave locking blocks (13) on the position of the conduction end corresponding to the structure outline of the concave annular grooves (15).

8. The dynamic load testing device for motor bearings based on dual-axis coupling according to claim 7, characterized in that, The concave block (13) moves in a relatively horizontal direction relative to the joint shaft (10) along the length of the working platform (1), and the contact surface between the concave block (13) and the concave annular groove (15) is provided with multiple balls.

9. The dynamic load testing device for motor bearings based on dual-axis coupling according to claim 1, characterized in that, The center point of the power detection shaft (7) is provided with a ball head rod (19) corresponding to the length direction of the working platform (1). One end of the ball head rod (19) is spherical and matches the center point of one end of the connector shaft (10). The third slide (4) is provided with a pulse action component (8) corresponding to the other end of the ball head rod (19).

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