Traction motor vibration test tooling and method

Abstract

The traction motor vibration test tooling includes a bottom plate fixed with a vibration test table, characterized in that: a circular boss in the shape of a disc is installed on the bottom plate, the circular boss is arranged at the center of the bottom plate and the installation height of the circular boss on the bottom plate is adjustable, the traction motor is horizontally placed on the bottom plate, the upper suspension of the traction motor is detachably connected with the bottom plate, and the lower suspension is detachably connected with the circular boss. The present application ensures the synchronization of the upper and lower suspensions in the vibration process, simulates the vibration working condition when the traction motor is actually installed, improves the reliability of the test, the traction motor is horizontally placed and the upper and lower suspensions are respectively fixed on the tooling, which can effectively avoid the low-frequency drift phenomenon in the low-frequency range during the vertical vibration impact resistance test, reduce the test suspension times, improve the test efficiency, meet the vibration test requirements of traction motors of different specifications, and improve the universality and practicality of the test tooling. The present application also provides a traction motor vibration test method.

Description

Technical Field

[0001] This invention relates to a vibration testing fixture for traction motors, used for vibration testing of traction motors. This invention also provides a method for vibration testing of traction motors. Background Technology

[0002] Traction motors, as key components providing core power to locomotives and rolling stock such as high-speed trains, subways, and urban rail transit, must pass vibration and shock tests during type testing. These tests require vibration and shock measurements in the X, Y, and Z directions. However, when conducting vibration and shock tests on traction motors according to the standard "GBT 21563-2018 Shock and Vibration Tests for Rail Transit Locomotives and Rolling Stock," the testing fixtures lack compatibility, resulting in inconsistent vibration magnitudes between the upper and lower suspensions of the motor. CN201721272551.9 discloses a traction motor vibration test fixture, including a base plate, a fixing plate, and a fixing block. The base plate is used to fix itself on a vibration test bench and has multiple through holes for fixing to the vibration test bench. The fixing plate is vertically welded to the base plate and has countersunk holes for fixing the traction motor. The fixing block is welded to the upper end face of the fixing plate and has threaded holes for fixing the traction motor on its upper end face. A pair of first reinforcing plates are symmetrically arranged on both sides of the rear plane, and a pair of second reinforcing plates are arranged on both sides of the front plane. A reinforcing rib is provided between the pair of first reinforcing plates. The disadvantage of the above solution is:

[0003] 1. Vibration testing fixtures are not very versatile and generally only compatible with two types of traction motors;

[0004] 2. The magnitude of vibration varies significantly between the upper and lower suspensions of the motor;

[0005] 3. During the vertical vibration and shock resistance test, low-frequency drift occurs in the low-frequency range, causing the test to be suspended. Summary of the Invention

[0006] The traction motor vibration testing fixture provided by this invention ensures the synchronization of the upper and lower suspensions during vibration, simulates the vibration conditions during actual installation of the traction motor, and improves the reliability of the test. The traction motor is horizontal, and the upper and lower suspensions are respectively fixed to the fixture, which effectively avoids low-frequency drift in the low-frequency range during vertical vibration impact withstand testing, reduces the number of test pauses, improves test efficiency, meets the vibration testing requirements of traction motors of different specifications, and enhances the versatility and practicality of the testing fixture. This invention also provides a traction motor vibration testing method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A traction motor vibration test fixture includes a base plate fixed to a vibration test bench. The fixture is characterized in that: a disc-shaped circular boss is installed on the base plate, the circular boss is located at the center of the base plate and its installation height on the base plate is adjustable, the traction motor is placed horizontally on the base plate, the upper suspension of the traction motor is detachably connected to the base plate, and the lower suspension is detachably connected to the circular boss.

[0009] Preferably, the base plate is a regular polygon with multiple through holes for fixing to the vibration test bench. Each side wall of the base plate has a connection hole for connecting to the upper suspension of the traction motor, and each connection hole on the side wall connects to the upper suspension of a traction motor of a different specification.

[0010] Preferably, the base plate has a central through hole corresponding to the circular boss, the central through hole has an annular positioning step surface in the middle, the circular boss extends into the central through hole and abuts against the annular positioning step surface, the top surface of the circular boss protrudes from the central through hole, and the circular boss is fixed to the annular positioning step surface by bolts.

[0011] Preferably, the annular positioning step surface is covered with height adjustment shims for adjusting the height of the circular boss, and the number of height adjustment shims is multiple, with each shim having a different thickness.

[0012] Preferably, the circular protrusion has a waist-shaped hole corresponding to the lower suspension of the traction motor. The waist-shaped holes are distributed in multiple groups at radial intervals. Each group of waist-shaped holes includes two waist-shaped holes corresponding to the lower left suspension connection hole and the lower right suspension connection hole of the traction motor, respectively.

[0013] A method for testing the vibration of a traction motor, characterized by: using the traction vibration testing fixture described above, with the following steps:

[0014] S1: Adjust the height of the round boss on the base plate according to the dimensions of the upper and lower suspensions of the traction motor being tested, and install the round boss on the base plate;

[0015] S2: The traction motor under test is placed horizontally on the base plate, and the upper suspension of the traction motor under test is connected to the base plate, and the lower suspension is connected to the round boss.

[0016] S3: First, fix the base plate on the vertical vibration test bench to assess the longitudinal vibration impact resistance performance of the traction motor under test; then fix the base plate on the horizontal vibration test bench to assess the vertical and lateral vibration impact resistance performance of the traction motor under test.

[0017] Preferably, step S1 specifically refers to:

[0018] First, based on the dimensions of the upper and lower suspensions of the traction motor under test, select the connection hole that connects to the upper suspension of the traction motor under test. Based on the height of the connection between the lower suspension of the traction motor and the circular boss, lay appropriate height adjustment shims on the annular positioning step surface.

[0019] Next, based on the position of the connecting hole, rotate the round boss on the base plate to make the position of the waist-shaped hole and the connecting hole match the upper and lower suspensions of the traction motor being tested, and then fix the round boss to the base plate with bolts.

[0020] Preferably, during step S3, the vibration amplitude of the upper and lower suspensions of the traction motor under test is monitored, and the vibration level of the vibration test bench is corrected until the difference between the vibration amplitudes of the upper and lower suspensions of the traction motor under test is less than 6dB.

[0021] The beneficial effects of the invention are:

[0022] In this invention, the traction motor vibration test fixture has a base plate fixed to the vibration test bench, a circular boss mounted on the base plate, and a horizontally positioned traction motor placed on the base plate. The upper suspension of the traction motor is detachably connected to the base plate, and the lower suspension is detachably connected to the circular boss, ensuring that both the upper and lower suspensions are fixed to the base plate. This guarantees the synchronicity of the upper and lower suspensions during vibration, simulating the vibration conditions during actual installation of the traction motor and improving the reliability of the test. The horizontal positioning of the traction motor and the separate fixing of the upper and lower suspensions to the fixture effectively avoid low-frequency drift in the low-frequency range during vertical vibration impact tolerance testing, reducing the number of test pauses and improving test efficiency. Connection holes for connecting the upper suspensions of traction motors of different specifications are provided on the base plate, and connection holes for connecting the lower suspensions of traction motors of different specifications are provided on the circular boss. The height of the circular boss on the base plate can be adjusted according to connection requirements, allowing traction motors of different specifications to be mounted on the test fixture, meeting the vibration test requirements of different traction motor specifications and improving the versatility and practicality of the test fixture. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a traction motor mounted on the traction motor vibration test fixture of the present invention.

[0024] Figure 2 This is a top view of the traction motor vibration test fixture.

[0025] Figure 3 This is a front view of the traction motor vibration test fixture.

[0026] Figure 4 This is an exploded view of the traction motor vibration test fixture. Detailed Implementation

[0027] The following is combined with Figures 1-4 The embodiments of the present invention will be described in detail below.

[0028] A traction motor vibration test fixture includes a base plate 1 fixed to a vibration test bench. The fixture is characterized in that: a disc-shaped circular boss 2 is installed on the base plate 1, the circular boss 2 is located at the center of the base plate 1 and its installation height on the base plate 1 is adjustable, the traction motor 3 is horizontally placed on the base plate 1, the upper suspension of the traction motor 3 is detachably connected to the base plate 1, and the lower suspension is detachably connected to the circular boss 2.

[0029] In the traction motor vibration test fixture described above, the base plate 1 is fixed to the vibration test bench, the circular boss 2 is mounted on the base plate 1, and the traction motor 3 is horizontally placed on the base plate 1. The upper suspension of the traction motor 3 is detachably connected to the base plate 1, and the lower suspension is detachably connected to the circular boss 2, ensuring that both the upper and lower suspensions of the traction motor 3 are fixed on the base plate 1. This guarantees the synchronicity of the upper and lower suspensions during vibration, simulating the vibration conditions during actual installation of the traction motor and improving the reliability of the test. The horizontal position of the traction motor and the separate fixing of the upper and lower suspensions to the fixture effectively avoid low-frequency drift in the low-frequency range during vertical vibration impact resistance tests, reducing the number of test pauses and improving test efficiency. Connection holes for connecting the upper suspensions of traction motors of different specifications are provided on the base plate 1, and connection holes for connecting the lower suspensions of traction motors of different specifications are provided on the circular boss 2. The height of the circular boss 2 on the base plate 1 can be adjusted according to connection requirements, allowing traction motors of different specifications to be mounted on the test fixture, meeting the vibration test requirements of different specifications of traction motors and improving the versatility and practicality of the test fixture.

[0030] The base plate 1 is a regular polygon with multiple through holes 11 for fixing to a vibration test bench. Each side wall of the base plate 1 has a connection hole 12 for connecting to the upper suspension of a traction motor. Each connection hole 12 on a side wall connects to the upper suspension of a traction motor of a different specification. As shown in the figure, each side wall of the base plate 1 has a connection hole 12, and each connection hole 12 can connect to the upper suspension of a traction motor of a specific specification. This allows the base plate 1 to be connected to the upper suspension of various traction motors of different specifications, meeting the vibration test requirements of traction motors of different specifications.

[0031] The base plate 1 has a central through hole 13 corresponding to the circular boss 2. The central through hole 13 has an annular positioning step surface 14 in its center. The circular boss 2 extends into the central through hole 13 and abuts against the annular positioning step surface 14. The top surface of the circular boss 2 protrudes from the central through hole 13. The circular boss 2 is fixed to the annular positioning step surface 14 by bolts. The annular positioning step surface 14 is located at the center of the central through hole 12 along its axial direction. The circular boss 2 is placed in the central through hole 13 and positioned by the annular positioning step surface 14.

[0032] The annular positioning step 14 is provided with height-adjusting shims 4 for adjusting the height of the circular boss 2. Multiple shims 4 are used, each with a different thickness. The circular boss 2 is placed on the shims 4 after the height-adjusting shims 4 are laid on the annular positioning step 14. Bolts are then passed through the circular boss 2 and the shims 4 and tightened to position the circular boss 2 on the annular positioning step 14. Different thicknesses and numbers of shims 4 allow the circular boss 2 to be adjusted to different heights to meet the connection requirements of the under-suspension of traction motors of different specifications.

[0033] The circular boss 2 has oblong holes 21 corresponding to the lower suspension of the traction motor 3. Multiple sets of oblong holes 21 are radially spaced, and each set includes two oblong holes corresponding to the left and right lower suspension connection holes of the traction motor, respectively. The multiple sets of oblong holes 21 on the circular boss 2 allow each set to connect to the lower suspension of a traction motor of a specific specification, thus meeting the vibration testing requirements of traction motors of different specifications.

[0034] The process of mounting the traction motor onto the traction motor vibration test fixture described above is as follows:

[0035] First, based on the dimensions of the upper and lower suspensions of the traction motor being tested, select the connection hole 12 that connects to the upper suspension of the traction motor. Based on the height of the connection between the lower suspension of the traction motor and the circular boss 2, lay appropriate height adjustment shims 4 on the annular positioning step surface 14 so that the height of the circular boss 2 meets the connection requirements.

[0036] Next, based on the position of the connecting hole 12, rotate the round boss 2 on the base plate 1 so that the positions of the waist-shaped hole 21 and the connecting hole 12 meet the connection requirements of the traction motor for suspension. Then, fix the round boss 2 to the base plate 1 with bolts.

[0037] Then, the traction motor to be tested is placed horizontally on the base plate 1. The upper suspension of the traction motor is connected to the corresponding connecting hole 12 with bolts, and the lower suspension is connected to the corresponding oblong hole 21 with bolts, thus connecting the traction motor to the test fixture. After fixing the base plate 1 to the vibration test bench, the vibration test of the traction motor can be carried out.

[0038] This invention also provides a method for testing the vibration of a traction motor, characterized in that: the test is conducted using the traction vibration testing fixture described above, and the steps are as follows:

[0039] S1: Adjust the height of the round boss 2 on the base plate 1 according to the dimensions of the upper and lower suspensions of the traction motor being tested, and install the round boss 2 on the base plate 1;

[0040] S2: The traction motor under test is placed horizontally on the base plate 1, and the upper suspension of the traction motor under test is connected to the base plate 1, and the lower suspension is connected to the round boss 2.

[0041] S3: First, fix the base plate 1 on the vertical vibration test bench to assess the longitudinal vibration impact resistance performance of the traction motor under test; then fix the base plate 1 on the horizontal vibration test bench to assess the vertical and lateral vibration impact resistance performance of the traction motor under test.

[0042] In the above-described traction motor vibration test method, the base plate 1 is fixed to the vibration test bench, the circular boss 2 is installed on the base plate 1, and the traction motor under test is placed horizontally on the base plate 1. The upper suspension of the traction motor under test is connected to the base plate 1, and the lower suspension is connected to the circular boss 2, so that both the upper and lower suspensions of the traction motor under test are fixed on the base plate 1. The traction motor under test, the base plate, and the circular boss form a whole, ensuring the synchronicity of the upper and lower suspensions during vibration. Since the traction motor under test is set horizontally, the longitudinal vibration impact resistance performance of the traction motor is assessed on the vertical vibration test bench, and the vertical and lateral vibration impact resistance performance of the traction motor is assessed on the horizontal vibration test bench, simulating the vibration conditions when the traction motor is actually installed, thus improving the reliability of the test. The traction motor is horizontal, and the upper and lower suspensions are fixed on the fixture respectively, which can effectively avoid the low-frequency drift phenomenon in the low-frequency range during the vertical vibration impact resistance test, reduce the number of test pauses, and improve test efficiency.

[0043] Specifically, step S1 refers to:

[0044] First, based on the dimensions of the upper and lower suspensions of the traction motor under test, select the connection hole 12 that connects to the upper suspension of the traction motor under test. Based on the height of the connection between the lower suspension of the traction motor and the round boss 2, lay an appropriate height adjustment shim 4 on the annular positioning step surface 14.

[0045] Next, based on the position of the connecting hole 12, rotate the round boss 2 on the base plate 1 so that the positions of the waist-shaped hole 21 and the connecting hole 12 are adapted to the upper and lower suspensions of the traction motor under test, and then fix the round boss 2 on the base plate 1 with bolts.

[0046] Based on the dimensions of the upper and lower suspensions of the traction motor under test, select the connecting hole 12 and adjust the height of the round boss 2. Then, install the traction motor under test on the base plate 1 so that the traction motor under test, the round boss 2 and the base plate 1 form a whole, ensuring the vibration synchronization of the upper and lower suspensions of the traction motor under test during the vibration test.

[0047] In step S3, the vibration amplitudes of the upper and lower suspensions of the traction motor under test are monitored, and the vibration level of the vibration test bench is corrected until the difference in vibration amplitude between the upper and lower suspensions of the traction motor under test is less than 6 dB. By correcting the vibration level of the vibration test bench to ensure that the difference in vibration amplitude between the upper and lower suspensions of the traction motor under test is less than 6 dB, the synchronicity of the upper and lower suspensions of the traction motor under test during vibration is guaranteed, thus improving the reliability of the test.

[0048] The technical solutions of the embodiments of the present invention have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. 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.

Claims

1. A traction motor vibration test fixture comprising a base plate fixed to a vibration test table, characterized in that: A disc-shaped boss is installed on the base plate. The boss is located at the center of the base plate and its installation height on the base plate is adjustable. The traction motor is horizontally placed on the base plate. The upper suspension of the traction motor is detachably connected to the base plate, and the lower suspension is detachably connected to the boss. The base plate is in the shape of a regular polygon, and has multiple through holes that can be fixed to the vibration test bench. The side walls of the base plate are all provided with connection holes for connecting to the upper suspension of the traction motor, and each connection hole on the side wall is connected to the upper suspension of the traction motor of a different specification. The base plate has a central through hole corresponding to the circular boss. The central through hole has an annular positioning step surface in the middle. The circular boss extends into the central through hole and abuts against the annular positioning step surface. The top surface of the circular boss protrudes from the central through hole. The circular boss is fixed to the annular positioning step surface by bolts. The annular positioning step surface is covered with height adjustment shims for adjusting the height of the circular boss. There are multiple height adjustment shims, and each shim has a different thickness. The circular protrusion has oblong holes corresponding to the lower suspension of the traction motor. Multiple sets of oblong holes are distributed radially, and each set of oblong holes includes two oblong holes corresponding to the lower left suspension connection hole and the lower right suspension connection hole of the traction motor, respectively.

2. A vibration test method for traction motors, characterized in that: The traction motor vibration test fixture described in claim 1 is used for testing, and the steps are as follows: S1: Adjust the height of the round boss on the base plate according to the dimensions of the upper and lower suspensions of the traction motor being tested, and install the round boss on the base plate; S2: The traction motor under test is placed horizontally on the base plate, and the upper suspension of the traction motor under test is connected to the base plate, and the lower suspension is connected to the round boss. S3: First, fix the base plate on the vertical vibration test bench to assess the longitudinal vibration impact resistance performance of the traction motor under test; then fix the base plate on the horizontal vibration test bench to assess the vertical and lateral vibration impact resistance performance of the traction motor under test.

3. The traction motor vibration test method according to claim 2, characterized in that, Step S1 specifically refers to: First, based on the dimensions of the upper and lower suspensions of the traction motor under test, select the connection hole that connects to the upper suspension of the traction motor under test. Based on the height of the connection between the lower suspension of the traction motor and the circular boss, lay appropriate height adjustment shims on the annular positioning step surface. Next, based on the position of the connecting hole, rotate the round boss on the base plate to make the position of the waist-shaped hole and the connecting hole match the upper and lower suspensions of the traction motor being tested, and then fix the round boss to the base plate with bolts.

4. The traction motor vibration test method according to claim 2, characterized in that: During step S3, the vibration amplitude of the upper and lower suspensions of the traction motor under test is monitored, and the vibration level of the vibration test bench is corrected until the difference between the vibration amplitudes of the upper and lower suspensions of the traction motor under test is less than 6dB.

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