Axial load testing device and method for motor positioning end bearing

Abstract

This invention relates to the field of motor bearing testing technology, specifically to a testing device and method for testing the axial load of a motor positioning end bearing. It primarily addresses the technical problem that existing motor bearing axial load testing methods are unsuitable for motors operating in strong magnetic environments. The testing device includes a floating end bearing cover, a floating end sealing ring, a positioning end bearing, a positioning end detection mechanism, a floating end loading mechanism, and a data acquisition system. The positioning end detection mechanism includes a test bearing cover, a first piezoelectric force sensor, and an elastic support component. The floating end loading mechanism includes a support frame, a linear power element, and a second piezoelectric force sensor. The data acquisition system includes a data acquisition instrument. This solution is based on a contact-type piezoelectric force sensor for structural design to complete the test, offering advantages such as resistance to strong magnetic interference and suitability for motors operating in strong magnetic environments.

Description

Technical Field

[0001] This invention relates to the field of motor bearing testing technology, and in particular to a device and method for testing the axial load of a motor positioning end bearing. Background Technology

[0002] Horizontally mounted motor bearings experience two loads: radial load and axial load. The radial load is shared by the locating end bearing and the floating end bearing, while the axial load is borne solely by the locating end bearing. The axial load is crucial for the reliability assessment of the locating end bearing, especially in operating environments where large axial loads can easily cause severe damage. Therefore, measuring the axial load on the locating end bearing is essential for bearing configuration selection and fault analysis.

[0003] In existing technologies, strain gauges are generally used to indirectly obtain the axial load of motor bearings. Although this method is convenient and flexible, some motors have strong magnetic environments. When placed in a strong magnetic environment, this method is easily affected by electromagnetic interference (the strain gauge is prone to data distortion due to strong magnetic induction interference voltage), making it impossible to obtain accurate loads. In fact, under strong electromagnetic interference, signal saturation or circuit overload may occur, making it impossible to measure at all.

[0004] Therefore, there is an urgent need for a device and method for testing the axial load of the positioning end bearing of a motor in a strong magnetic environment. Summary of the Invention

[0005] To overcome the technical shortcomings of existing motor bearing axial load testing methods that are not applicable to motors in strong magnetic environments, this invention provides a testing device and method for testing the axial load of motor positioning end bearings.

[0006] The axial load testing device for motor positioning end bearings provided by the present invention includes a floating end bearing cover, a floating end sealing ring and a positioning end bearing, and also includes a positioning end detection mechanism, a floating end loading mechanism and a data acquisition system;

[0007] The positioning end detection mechanism includes a test bearing cover to replace the original positioning end bearing cover. The end face of the test bearing cover near the positioning end bearing is arranged at a distance from the positioning end bearing and has multiple mounting positions evenly distributed along the circumference. Each mounting position is equipped with a first piezoelectric force sensor and an elastic support. The first piezoelectric force sensor extends out of the end face of the test bearing cover near the positioning end bearing and abuts against the outer ring of the positioning end bearing under the action of the elastic support.

[0008] The floating end loading mechanism includes a support frame fixed to the floating end bearing cover, a linear power element is installed on the support frame, the linear power element is located outside the motor and is used to apply axial thrust to the floating end sealing ring, and a second piezoelectric force sensor is provided between the output end of the linear power element and the floating end sealing ring.

[0009] The data acquisition system includes a data acquisition instrument, which is communicatively connected to both the first piezoelectric force sensor and the second piezoelectric force sensor.

[0010] Optionally, the mounting position is a through hole, the elastic support includes a locking member and an elastic member, the position of the locking member in the through hole is adjustable, and the elastic member is pressed between the locking member and the first piezoelectric force sensor.

[0011] Optionally, the through hole for installing the locking element has an internal thread, the locking element is a stud screwed into the internal thread, and the elastic element is a spring.

[0012] Optionally, the first piezoelectric force sensor is connected to the data acquisition instrument via a signal cable. The test bearing cover has multiple lead-in channels, each corresponding to one of the first piezoelectric force sensors. The lead-in channels are used to lead the signal cable from the corresponding first piezoelectric force sensor to the data acquisition instrument.

[0013] Optionally, the test bearing cover has an annular groove on the end face near the positioning bearing. The mounting position is located outside the annular groove and is laterally connected to the annular groove. One end of the lead wire channel extends to the bottom of the annular groove and the other end extends to the outside of the motor.

[0014] Optionally, the support frame includes a fixed plate, and multiple support tubes are provided between the fixed plate and the floating end bearing cover. The multiple support tubes are distributed at intervals along the circumference of the motor and each support tube is arranged along the axial direction. The fixed plate is pressed and fixed by bolts that pass through the support tubes and are screwed to the floating end bearing cover. The linear power element is mounted on the fixed plate.

[0015] Optionally, the linear power element is a hydraulic cylinder, the cylinder body of which is screwed onto the fixed plate, and the second piezoelectric force sensor is fixed to the end face of the floating end sealing ring.

[0016] Optionally, the data acquisition system further includes a first signal adapter and a second signal adapter, wherein the first signal adapter is communicatively connected between the data acquisition instrument and the first piezoelectric force sensor, and the second signal adapter is communicatively connected between the data acquisition instrument and the second piezoelectric force sensor.

[0017] The method for testing the axial load of a motor positioning end bearing provided by this invention includes the following steps:

[0018] S1. The aforementioned motor positioning end bearing axial load testing device is used for testing. The reading of the first piezoelectric force sensor is read as F1 and the reading of the second piezoelectric force sensor is read as F2 by the data acquisition instrument.

[0019] S2. Remove the floating end loading mechanism and build a test bench on the floating end of the motor. Apply axial thrust to the floating end sealing ring through the test bench and read the reading of the first piezoelectric force sensor as F3 through the data acquisition instrument.

[0020] S3. The axial load of the positioning end bearing of the motor is (F2-F1+F3).

[0021] Optionally, in step S2, after confirming that the reading of the first piezoelectric force sensor has changed relative to the initial value, an axial thrust is applied to the floating end sealing ring through the test bench.

[0022] If the reading is still the initial value, the elastic support needs to be adjusted until the reading of the first piezoelectric sensor changes relative to the initial value.

[0023] The technical solution provided by this invention has the following advantages compared with the prior art:

[0024] The axial load testing device and method for motor positioning end bearings provided by this invention employs a piezoelectric force sensor for detection, which has the advantage of resisting strong magnetic interference and is suitable for motors in strong magnetic environments. Simultaneously, a positioning end detection mechanism and a floating end loading mechanism are added. The positioning end detection mechanism can measure the thrust borne by the outer ring of the motor positioning end bearing, and the floating end loading mechanism can measure the axial load applied by the floating end of the motor. The difference between the two is the frictional force when the motor positioning end bearing slides under a large axial load. Then, when using an existing test bench instead of the floating end loading mechanism, the sum of the thrust borne by the outer ring of the motor positioning end bearing measured by the positioning end detection mechanism and this frictional force is the axial load borne by the motor positioning end bearing. This provides an effective hardware environment for the piezoelectric force sensor, ensuring its feasibility, and also considers friction factors, resulting in more accurate measurement results. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the testing device in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram showing the structure of the floating end bearing cover and its auxiliary components in an embodiment of the present invention;

[0029] Figure 3 express Figure 2 Sectional view at point AA;

[0030] Figure 4 express Figure 2 Sectional view at point BB;

[0031] Figure 5 This is a schematic diagram of the structure of the fixed disk in an embodiment of the present invention;

[0032] Figure 6 This is a flowchart illustrating the testing method in an embodiment of the present invention.

[0033] In the picture:

[0034] 1. Positioning end detection mechanism; 11. Test bearing cover; 111. Mounting position; 112. Lead wire channel; 113. Annular groove; 114. Mounting hole; 12. First piezoelectric force sensor; 13. Elastic support; 131. Locking element; 132. Elastic element; 2. Floating end loading mechanism; 21. Support frame; 211. Fixed plate; 212. Support tube; 213. Bolt; 22. Linear power element; 221. Oil pipe; 222. Hydraulic pump; 23. Second piezoelectric force sensor; 3. Data acquisition system; 31. Data acquisition instrument; 32. Signal cable; 33. First signal adapter; 34. Second signal adapter;

[0035] 100. Floating end bearing cover; 200. Floating end sealing ring; 300. Positioning end bearing; 400. Stator; 500. Rotor; 600. Floating end bearing; 700. Positioning end sealing ring. Detailed Implementation

[0036] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0037] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0039] The following is combined with Figures 1 to 6 Specific embodiments of the present invention will be described in detail below. Example 1

[0040] This embodiment provides a motor positioning end bearing axial load testing device, including a floating end bearing cover 100, a floating end sealing ring 200, a positioning end bearing 300, a positioning end detection mechanism 1, a floating end loading mechanism 2, and a data acquisition system 3.

[0041] It should be noted that the above list only includes the components improved by this solution compared to the existing motor structure, as well as components related to the improved components. Other necessary components are still included, such as the stator 400, rotor 500, floating end bearing 600, and positioning end sealing ring 700. The rotor 500 is mounted on the stator 400 via the floating end bearing 600 and the positioning end bearing 300. The floating end bearing cover 100 presses against the outer ring of the floating end bearing 600, and the floating end ring presses against the inner ring of the floating end bearing 600. The positioning end bearing cover (replaced by the test bearing cover 11 described later in this solution) presses against the outer ring of the positioning end bearing 300, and the positioning end sealing ring 700 presses against the inner ring of the positioning end bearing 300. The floating end is the transmission end, and the positioning end is the non-transmission end.

[0042] The positioning end detection mechanism 1 includes a test bearing cover 11, a first piezoelectric force sensor 12, and an elastic support member 13. The test bearing cover 11 is used to replace the original positioning end bearing cover. The end face of the test bearing cover 11 near the positioning end bearing 300 is arranged at a distance from the positioning end bearing 300 and has multiple mounting positions 111 evenly distributed along the circumference. Each mounting position 111 is equipped with a first piezoelectric force sensor 12 and an elastic support member 13. The first piezoelectric force sensor 12 extends out of the end face of the test bearing cover 11 near the positioning end bearing 300 and abuts against the outer ring of the positioning end bearing 300 under the action of the elastic support member 13.

[0043] It is easy to understand that when the positioning bearing 300 is subjected to a large axial load, it will move axially. Therefore, the end face of the test bearing cover 11 and the positioning bearing 300 need to be arranged separately to allow for the movement of the positioning bearing 300. This allows the axial load on the positioning bearing 300 to be fully converted into the frictional force between the outer ring of the positioning bearing 300 and the stator 400 and the thrust of the outer ring of the positioning bearing 300 on the first piezoelectric force sensor 12. This thrust can be read by the first piezoelectric force sensor 12.

[0044] Specifically, the first piezoelectric force sensor 12 is cylindrical in shape, with a signal cable 32 leading out from the side. Of course, the first piezoelectric force sensor 12 can also be prismatic or other shapes, but it must be able to ensure axial force transmission.

[0045] It should be noted that the so-called test bearing cover 11 is used to replace the original positioning end bearing cover. That is, the test bearing cover 11 is installed in the position of the original positioning end bearing cover and has the same function as the original positioning end bearing cover. However, it should be noted that in this solution, the test bearing cover 11 does not directly position the outer ring of the positioning end bearing 300. Instead, a gap is left between the test bearing cover 11 and the outer ring of the positioning end bearing 300, and the outer ring of the positioning end bearing 300 is positioned by the first piezoelectric force sensor 12.

[0046] Specifically, the outer edge of the test bearing cover 11 has eight mounting holes 114 evenly distributed circumferentially. The test bearing cover 11 is fixed to the end face of the stator 400 by fasteners passing through the mounting holes 114. Of course, the mounting holes 114 can also be designed to be five or other numbers.

[0047] Specifically, the mounting position 111 is a through hole, and the elastic support 13 includes a locking member 131 and an elastic member 132. The position of the locking member 131 in the through hole is adjustable, and the elastic member 132 is pressed between the locking member 131 and the first piezoelectric force sensor 12. Adjusting the position of the locking member 131 can cause a change in the elastic force of the elastic member 132, thereby allowing the first piezoelectric force sensor 12 to move axially under the action of this elastic force until it is pressed against the outer ring end face of the positioning end bearing 300, ensuring that the first piezoelectric force sensor 12 works effectively. Of course, the elastic support 13 can also be designed as a non-adjustable structure, and then the axial movement of the first piezoelectric force sensor 12 can be achieved by replacing the elastic support 13 of different specifications, but the operation is more cumbersome and laborious.

[0048] The structure of the locking member 131 and the spring is not limited. For example, in this embodiment, the hole section for mounting the locking member 131 is provided with an internal thread, the locking member 131 is a stud screwed into the internal thread, and the elastic member 132 is a spring. The elastic force of the elastic member 132 can be adjusted by turning the stud, thereby realizing the axial movement of the first piezoelectric force sensor 12. The operation is simple and convenient, and the performance is reliable. In other embodiments, the locking member 131 can also be designed as a telescopic rod or other adjustable structure, and the elastic member 132 can also be a deformable structure such as a silicone block.

[0049] It is easy to understand that the diameter of the through hole should be slightly larger than the outer diameter of the first piezoelectric force sensor 12 so that the first piezoelectric force sensor 12 can be placed; while the diameter of the hole section with internal threads should be smaller than the diameter of the through hole so that the stud can be inserted into the through hole.

[0050] Specifically, there are eight mounting positions 111 evenly distributed circumferentially, and the first piezoelectric force sensor 12 and the elastic support member 13 are each provided with eight corresponding positions. Of course, the mounting positions 111 can also be set to five or other numbers.

[0051] The floating end loading mechanism 2 includes a support frame 21, a linear power element 22, and a second piezoelectric force sensor 23. The support frame 21 is fixed to the floating end bearing cover 100. The linear power element 22 is mounted on the support frame 21. The linear power element 22 is located outside the motor and is used to apply axial thrust to the floating end sealing ring 200. The second piezoelectric force sensor 23 is provided between the output end of the linear power element 22 and the floating end sealing ring 200. During operation, the linear power element 22 outputs axial thrust, which is transmitted to the positioning end bearing 300 after passing through the second piezoelectric force sensor 23, the floating end sealing ring 200, and the rotor 500. Therefore, the reading of the second piezoelectric force sensor 23 minus the reading of the first piezoelectric force sensor 12 should be equal to the value of the frictional force between the outer ring of the positioning end bearing 300 and the stator 400.

[0052] It is easy to understand that the range of the second piezoelectric force sensor 23 should be greater than that of the first piezoelectric force sensor 12, because the reading of the second piezoelectric force sensor 23 is equal to the sum of the reading of the first piezoelectric force sensor 12 and the friction force value.

[0053] Specifically, the support frame 21 includes a fixed plate 211. Multiple support tubes 212 are provided between the fixed plate 211 and the floating end bearing cover 100. These support tubes 212 are spaced apart circumferentially along the motor, and each support tube 212 is arranged axially. The fixed plate 211 is tightened and fixed by bolts 213 that pass through the support tubes 212 and are screwed onto the floating end bearing cover 100. The linear power element 22 is mounted on the fixed plate 211. The combined structure of the fixed plate 211, support tubes 212, and bolts 213 is convenient to install and disassemble, and provides a secure fixation. Of course, the support frame 21 can also adopt a box-shaped, gantry-type, or other commonly used support structure.

[0054] The specific structure of the linear power element 22 is not limited. For example, in this embodiment, the linear power element 22 is a hydraulic cylinder, and the cylinder body has external threads and is screwed onto the fixed plate 211. In actual use, the hydraulic cylinder needs to be connected to the oil pipe 221 and the hydraulic pump 222. In other embodiments, the linear power element 22 can also be an electric cylinder or a pneumatic cylinder, and the linear power element 22 can also be fixed to the support frame 21 by clips or flanges.

[0055] The method of fixing the second piezoelectric force sensor 23 is not limited. For example, in this embodiment, the second piezoelectric force sensor 23 is attached to the end face of the floating end sealing ring 200. In other embodiments, the second piezoelectric force sensor 23 can also be fixed to the end face of the output end of the linear power element 22.

[0056] It is easy to understand that a through hole should be opened at the position of the fixed plate 211 corresponding to the support tube 212, and the diameter of the through hole should be slightly smaller than the inner diameter of the support tube 212 so that the bolt 213 can be inserted into the support tube 212; the length of the support tube 212 should be matched with the stroke design of the hydraulic cylinder.

[0057] Specifically, the second piezoelectric force sensor 23 is cylindrical in shape, with a signal cable 32 leading out from the side. Of course, the second piezoelectric force sensor 23 can also be prismatic or other shapes, but it must be able to ensure axial force transmission.

[0058] The data acquisition system 3 includes a data acquisition instrument 31, which is communicatively connected to both the first piezoelectric force sensor 12 and the second piezoelectric force sensor 23.

[0059] Specifically, the type of data acquisition device 31 is not limited. For example, the data acquisition device 31 in this embodiment has both AC and DC data acquisition modes. More flexible to use .

[0060] Specifically, both the first piezoelectric force sensor 12 and the second piezoelectric force sensor 23 are connected to the data acquisition instrument 31 via signal cables 32, resulting in a more stable signal and stronger anti-interference capabilities. However, it should be noted that when the first piezoelectric force sensor 12 is connected to the data acquisition instrument 31 via signal cables 32, the test bearing cover 11 needs to have multiple lead wire channels 112. Each lead wire channel 112 corresponds one-to-one with a different first piezoelectric force sensor 12. The lead wire channels 112 are used to lead the signal cables 32 from the corresponding first piezoelectric force sensor 12 to the data acquisition instrument 31, thus meeting the lead wire requirements.

[0061] The way the lead-in channel 112 cooperates with the first piezoelectric force sensor 12 is not limited. For example, in this embodiment, an annular groove 113 is provided on the end face of the test bearing cover 11 near the positioning bearing 300. The mounting position 111 is located outside the annular groove 113 and is laterally connected to the annular groove 113. One end of the lead-in channel 112 extends to the bottom of the annular groove 113 and the other end extends to the outside of the motor. After the signal cable 32 is led out from the corresponding first piezoelectric force sensor 12, it passes through the annular groove 113 and the lead-in channel 112 in sequence to the outside of the motor, and then connects to the data acquisition instrument 31. This wiring method is relatively neat, and the annular groove 113 is the oil reservoir of the original positioning bearing cover, which is also more conducive to modifying the positioning bearing cover into a test bearing cover 11. In other embodiments, one end of the lead-in channel 112 can also be directly extended to the mounting position 111.

[0062] The structure of the lead channel 112 is not limited. For example, in this embodiment, the lead channel 112 includes an axial hole and a radial hole. One end of the axial hole extends to the bottom of the annular groove 113 and the other end communicates with one end of the radial hole. The other end of the radial hole extends to the outer surface of the test bearing cover 11 to lead to the outside. In other embodiments, the lead channel 112 may also be a curved channel.

[0063] In some embodiments, a first signal adapter 33 and a second signal adapter 34 may also be added to the data acquisition system 3. The first signal adapter 33 is communicatively connected between the data acquisition system 31 and the first piezoelectric force sensor 12, and the second signal adapter 34 is communicatively connected between the data acquisition system 31 and the second piezoelectric force sensor 23. The first signal adapter 33 and the second signal adapter 34 mainly process a pair of signals and then send the processed signals to the data acquisition system 31 for recording.

[0064] The working principle of the motor positioning end bearing axial load testing device in this embodiment is as follows:

[0065] a. Design and fabrication of test fixtures: The test fixtures include a test bearing cover 11 and a support frame 21;

[0066] b. Installation of piezoelectric force sensor: The sensor includes a first piezoelectric force sensor 12 and a second piezoelectric force sensor 23; the first piezoelectric force sensor 12 is installed in the through hole of the test bearing cover 11, and the output end of the first piezoelectric force sensor 12 is made to abut against the outer ring end face of the positioning end bearing 300 by means of studs and springs; the second piezoelectric force sensor 23 is pasted on the end face of the floating end sealing ring 200, and the hydraulic cylinder is adjusted so that its output end contacts the second piezoelectric force sensor 23;

[0067] c. Installation and debugging of data acquisition system 3: Connect the signal cable 32 of the first piezoelectric force sensor 12 and the signal cable 32 of the second piezoelectric force sensor 23 to the data acquisition instrument 31. Set the data acquisition instrument 31 to DC coupling acquisition mode and clear it before acquisition.

[0068] d. Bearing outer ring friction test: Pressure is applied by hydraulic cylinder. When the pressure reaches the maximum static friction between the outer ring of the positioning end bearing 300 and the stator 400, the movement of the positioning end bearing 300 changes to dynamic friction. At the same time, the first piezoelectric force sensor 12 detects the load. At this time, the readings of the first piezoelectric force sensor 12 and the second piezoelectric force sensor 23 are read. The difference between the two readings is the friction between the positioning end bearing 300 and the stator 400.

[0069] It should be noted that the positioning bearing 300 of the motor will experience abnormal temperature rise when subjected to abnormal axial loads, which may even cause wear on the bearing flange and reduce motor reliability. Furthermore, axial load is a crucial factor in bearing selection, and obtaining accurate axial load data is essential for motor bearing selection. This solution uses a piezoelectric force sensor to replace strain gauges susceptible to electromagnetic interference, solving the problem of measuring the dynamic load of the positioning bearing in a strong magnetic environment. Additionally, during actual use, the positioning bearing cover abuts against the outer ring end face of the positioning bearing 300, and abnormal axial loads occur during motor operation, making the testing of these axial loads quite challenging. This solution proposes an innovative concept: designing a test bearing cover 11 that causes the positioning bearing 300 to slide under large axial loads, thereby indirectly measuring the axial load through the sum of friction and thrust. Example 2

[0070] The method for testing the axial load of a motor positioning end bearing provided by this invention includes the following steps:

[0071] S1. The aforementioned motor positioning end bearing axial load testing device is used for testing. The reading of the first piezoelectric force sensor 12 is read as F1 by the data acquisition instrument 31, and the reading of the second piezoelectric force sensor 23 is read as F2.

[0072] It is easy to understand that this step is achieved by the motor positioning end bearing axial load testing device of Embodiment 1, specifically including step ad in Embodiment 1.

[0073] S2. Bearing outer ring thrust test: Remove the floating end loading mechanism 2 and build a test bench on the floating end of the motor. Apply axial thrust to the floating end sealing ring 200 through the test bench. Read the reading of the first piezoelectric force sensor 12 as F3 through the data acquisition instrument 31.

[0074] It is easy to understand that using a test bench for testing is a standard practice in this field, and will not be elaborated further here.

[0075] Specifically, after confirming that the reading of the first piezoelectric force sensor 12 has changed relative to the initial value, an axial thrust is applied to the floating end sealing ring 200 via the test bench. If the reading remains the initial value, the elastic support needs to be adjusted until the reading of the first piezoelectric sensor changes relative to the initial value. This operation ensures that the first piezoelectric force sensor 12 is in contact with the outer ring of the positioning end bearing 300 before testing, thus guaranteeing the effectiveness of the first piezoelectric force sensor 12.

[0076] S3. Calculation of bearing axial load: The axial load of the positioning end bearing 300 of the motor is (F2-F1+F3).

[0077] The above are merely specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. A device for testing the axial load of a motor positioning end bearing, comprising a floating end bearing cover (100), a floating end sealing ring (200), and a positioning end bearing (300), characterized in that, It also includes a positioning end detection mechanism (1), a floating end loading mechanism (2), and a data acquisition system (3); The positioning end detection mechanism (1) includes a test bearing cover (11) to replace the original positioning end bearing cover. The test bearing cover (11) is arranged at a distance from the positioning end bearing (300) on the end face near the positioning end bearing (300) and has multiple mounting positions (111) evenly distributed along the circumference. Each mounting position (111) is equipped with a first piezoelectric force sensor (12) and an elastic support member (13). The first piezoelectric force sensor (12) extends out of the end face of the test bearing cover (11) near the positioning end bearing (300) and abuts against the outer ring of the positioning end bearing (300) under the action of the elastic support member (13). The floating end loading mechanism (2) includes a support frame (21) fixed on the floating end bearing cover (100), a linear power element (22) is mounted on the support frame (21), the linear power element (22) is located outside the motor and is used to apply axial thrust to the floating end sealing ring (200), and a second piezoelectric force sensor (23) is provided between the output end of the linear power element (22) and the floating end sealing ring (200). The data acquisition system (3) includes a data acquisition instrument (31), which is communicatively connected to the first piezoelectric force sensor (12) and the second piezoelectric force sensor (23).

2. The axial load testing device for the motor positioning end bearing according to claim 1, characterized in that, The mounting position (111) is a through hole. The elastic support (13) includes a locking member (131) and an elastic member (132). The position of the locking member (131) in the through hole is adjustable. The elastic member (132) is pressed between the locking member (131) and the first piezoelectric force sensor (12).

3. The axial load testing device for the motor positioning end bearing according to claim 2, characterized in that, The through hole for installing the locking member (131) has an internal thread, the locking member (131) is a stud screwed into the internal thread, and the elastic member (132) is a spring.

4. The axial load testing device for the motor positioning end bearing according to claim 1, characterized in that, The first piezoelectric force sensor (12) is connected to the data acquisition instrument (31) via a signal cable (32). The test bearing cover (11) has multiple lead wire channels (112), each of which corresponds to a first piezoelectric force sensor (12). The lead wire channels (112) are used to lead the signal cable (32) from the corresponding first piezoelectric force sensor (12) to the data acquisition instrument (31).

5. The axial load testing device for the motor positioning end bearing according to claim 4, characterized in that, The test bearing cover (11) has an annular groove (113) on the end face near the positioning end bearing (300). The mounting position (111) is located outside the annular groove (113) and is laterally connected to the annular groove (113). One end of the lead wire channel (112) extends to the bottom of the annular groove (113) and the other end extends to the outside of the motor.

6. The axial load testing device for the motor positioning end bearing according to claim 1, characterized in that, The support frame (21) includes a fixed plate (211). A plurality of support tubes (212) are provided between the fixed plate (211) and the floating end bearing cover (100). The plurality of support tubes (212) are distributed at intervals along the circumference of the motor and each support tube (212) is arranged along the axial direction. The fixed plate (211) is pressed and fixed by bolts (213) that pass through the support tubes (212) and are screwed onto the floating end bearing cover (100). The linear power element (22) is installed on the fixed plate (211).

7. The axial load testing device for the motor positioning end bearing according to claim 6, characterized in that, The linear power element (22) is a hydraulic cylinder, the cylinder body of which is screwed onto the fixed plate (211), and the second piezoelectric force sensor (23) is fixed to the end face of the floating end sealing ring (200).

8. The axial load testing device for the motor positioning end bearing according to any one of claims 1 to 7, characterized in that, The data acquisition system (3) further includes a first signal adapter (33) and a second signal adapter (34). The first signal adapter (33) is communicatively connected between the data acquisition system (31) and the first piezoelectric force sensor (12), and the second signal adapter (34) is communicatively connected between the data acquisition system (31) and the second piezoelectric force sensor (23).

9. A method for testing the axial load of a bearing at the positioning end of a motor, characterized in that, Includes the following steps: S1. The test is performed using the motor positioning end bearing axial load testing device according to any one of claims 1 to 8. The reading of the first piezoelectric force sensor (12) is read as F1 by the data acquisition instrument (31), and the reading of the second piezoelectric force sensor (23) is read as F2. S2. Remove the floating end loading mechanism (2), and build a test bench on the floating end of the motor. Apply axial thrust to the floating end sealing ring (200) through the test bench. Read the reading of the first piezoelectric force sensor (12) as F3 through the data acquisition instrument (31). S3. The axial load of the positioning end bearing (300) of the motor is (F2-F1+F3).

10. The method for testing the axial load of the motor positioning end bearing according to claim 9, characterized in that, In step S2, after confirming that the reading value of the first piezoelectric force sensor (12) has changed relative to the initial value, an axial thrust is applied to the floating end sealing ring (200) through the test bench; If the reading is still the initial value, the elastic support needs to be adjusted until the reading of the first piezoelectric sensor changes relative to the initial value.

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