Tool and method for detecting coaxiality and flatness of motor support

Abstract

The invention relates to a motor support coaxiality and flatness detection jig and method, the motor support coaxiality and flatness detection jig comprises a supporting plate, a support fixing plate and a dial indicator, a first plane bearing is fixedly arranged on the supporting plate, a connecting shaft penetrates through the supporting plate and the support fixing plate and is in sliding fit with the first plane bearing, and the support fixing plate is rotatably connected with the supporting plate; a plurality of positioning assemblies are arranged on the support fixing plate and used for positioning to-be-detected motor supports of different models, each positioning assembly comprises a plurality of positioning holes, distribution of the positioning holes is matched with distribution of positioning protruding points of the to-be-detected motor supports of the models corresponding to the positioning assemblies, a pressing plate is arranged above each positioning hole, and the pressing plates are used for pressing the to-be-detected motor supports. The pressing plate is used for further pressing and fixing the positioned to-be-detected motor bracket on the bracket fixing plate; the dial indicator is used for measuring coaxiality data and flatness data of the motor support to be detected. Compared with the prior art, the accuracy and comprehensiveness of motor support detection can be further improved.

Description

Technical Field

[0001] This invention belongs to the field of motor bracket testing technology, and in particular relates to a fixture and method for testing the coaxiality and flatness of motor brackets. Background Technology

[0002] The structure of the motor is as follows Figure 6 As shown, the coaxiality and flatness of the motor bracket are important factors affecting motor performance and service life. The motor bracket structure is as follows: Figure 8 As shown, coaxiality refers to the four positioning protrusions A / A1 of the motor bracket (and...). Figure 7 The symmetry and position of the stator positioning slots (corresponding to the bearing axis) relative to the bearing's axis. The coaxiality of the motor bracket and the coincidence of the four positioning slots A / A1 of the stator relative to the axis determine the motor's performance and service life. Flatness refers to the smoothness of the bracket's mounting surface; the flatness of the bracket directly affects the parallelism of the two mounting plates and the overall performance of the machine.

[0003] For coaxiality testing of motor brackets, the main equipment on the market includes 2D, 3D, and image inspection devices. However, most of these devices are based on testing the bracket in its natural state after forming, which differs from the actual assembled result. This is because metal stamping parts undergo stress deformation during stretching and bending, especially when a product has multiple bends. It is impossible to perfectly achieve the ideal theoretical dimensions in mass production. When the error accumulates to a certain threshold, many products that pass inspection will still have problems after assembly and fail to meet performance requirements. Chinese patent application 2021109592230 discloses a rapid coaxiality testing method and tooling for assembly benches, which can perform coaxiality testing at any assembly position along with the assembly bench. However, in this solution, the tooling bushing is fixed and locked to the reference input shaft by a flat key and radial locking screws, which may cause the connection to loosen under high vibration or impact loads, resulting in measurement errors. In addition, the above solution cannot achieve flatness testing, and the comprehensiveness of the test needs to be further improved. Therefore, it is necessary to redesign a motor bracket inspection fixture that can simulate the actual state of the motor bracket and stator after assembly, and can inspect coaxiality and flatness after one clamping, thereby further improving the accuracy and comprehensiveness of the inspection results. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art by providing a fixture and method for detecting the coaxiality and flatness of motor brackets, thereby further improving the accuracy and comprehensiveness of motor bracket detection.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] The application provides a motor support coaxiality and flatness detection jig, which comprises a support plate, a support fixing plate and a dial indicator.

[0007] The first plane bearing is fixed on the support plate, the connecting shaft penetrates through the support plate and the support fixing plate and is in sliding fit with the first plane bearing, and the support fixing plate is rotatably connected with the support plate; the support fixing plate is provided with a plurality of positioning assemblies for positioning motor supports of different models to be detected, each positioning assembly comprises a plurality of positioning holes, the distribution of each positioning hole is matched with the distribution of positioning convex points of the motor support of the corresponding model to be detected, and a pressing plate is arranged above each positioning hole for further pressing and fixing the positioned motor support to be detected on the support fixing plate; the dial indicator is used for measuring the coaxiality data and flatness data of the motor support to be detected, the dial indicator is connected with a universal magnetic base through a universal connecting rod, and the universal magnetic base is fixed to the edge of the support plate through a magnetic switch.

[0008] Further, one side of the support fixing plate close to the support plate is processed through a lathe and a grinding machine to form a plurality of concentric annular bosses.

[0009] Further, one side of the support fixing plate close to the support plate is polished.

[0010] Further, the bottom of the support plate is provided with an anti-skid rubber pad.

[0011] Further, the pressing plate is adjusted to be pressed or relaxed through a screw.

[0012] Further, a buffer pad is arranged on the side of the pressing plate in contact with the motor support to be detected.

[0013] Further, a height-variable elastic assembly is arranged between the end of the pressing plate away from the motor support to be detected and the support fixing plate.

[0014] Further, the elastic assembly is a spring or elastic rubber.

[0015] Further, the universal connecting rod is sleeved on the universal magnetic base and is adjusted and fixed through a nut.

[0016] The application also provides a motor support coaxiality and flatness detection method based on the motor support coaxiality and flatness detection jig.

[0017] S1, a second plane bearing is loaded in the bearing chamber of the motor support to be detected, a detection shaft is penetrated through the second plane bearing, a spring is sleeved on the detection shaft, and a plane pad is placed on the top of the spring;

[0018] S2, the positioning point of the motor support to be detected is aligned with the positioning hole on the support fixing plate and is pressed tightly, the pressure plate is adjusted, and the motor support to be detected is fixed to the support fixing plate;

[0019] S3, the position of the dial gauge is adjusted so that the probe thereof is in contact with the circumferential surface of the detection shaft, the support fixing plate is rotated for one round, and the coaxiality data is read from the dial gauge;

[0020] S4, the position of the dial gauge is adjusted so that the probe thereof is in contact with the lowest point of the motor support to be detected, the support fixing plate is rotated for one round, and the flatness data is read from the dial gauge.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. The present application designs a motor support coaxiality and flatness detection jig, which comprises a support plate, a support fixing plate and a dial gauge, the support fixing plate is rotatably connected with the support plate, a plurality of positioning assemblies are arranged on the support fixing plate, different models of motor supports to be detected can be positioned, a plurality of models of support detection are supported, the application range is wide, and the economy is good; each positioning assembly comprises a plurality of positioning holes, the distribution of the positioning holes is matched with the distribution of the positioning protrusions of the corresponding model of the motor support to be detected, a pressure plate is arranged above each positioning hole, the motor support to be detected positioned can be further pressed and fixed to the support fixing plate, at this time, the positioning hole is equivalent to the positioning groove of the stator, the detection is closer to the actual state after the motor support is assembled with the stator, whether the cumulative error of the support after assembly meets the technical requirements can be accurately detected, and the accuracy of the detection result is further improved.

[0023] 2. When the jig designed by the present application is used for detection, the positioning point of the motor support to be detected is aligned with the positioning hole on the support fixing plate and is pressed tightly, after the motor support to be detected is fixed to the support fixing plate, the position of the dial gauge is adjusted so that the probe thereof is in contact with the circumferential surface of the detection shaft, the support fixing plate is rotated for one round, and the coaxiality data can be read from the dial gauge; after the coaxiality detection is completed, the motor support does not need to be disassembled and assembled, only the position of the dial gauge needs to be adjusted so that the probe thereof is in contact with the lowest point of the motor support to be detected, the support fixing plate can be rotated for one round, and the flatness data can be read from the dial gauge. The above detection scheme is convenient to operate, the coaxiality and flatness two items can be detected by one clamping, the comprehensiveness of the detection result is improved, and the detection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a front view of the motor support coaxiality and flatness detection jig;

[0025] Figure 2 It is a top view of the motor support coaxiality and flatness detection jig;

[0026] Figure 3 This is a schematic diagram of the machining process for the bottom surface of the bracket fixing plate.

[0027] Among them, (3a) is the front view of the bracket fixing plate, and (3b) is the bottom view of the bracket fixing plate;

[0028] Figure 4 This is a schematic diagram illustrating the use of a motor bracket coaxiality and flatness testing fixture for coaxiality testing.

[0029] Among them, (4a) is the front view of the fixture during coaxiality testing, and (4b) is the top view of the fixture during coaxiality testing;

[0030] Figure 5 This is a schematic diagram illustrating the use of a fixture for testing the coaxiality and flatness of a motor bracket for flatness inspection.

[0031] Among them, (5a) is the front view of the fixture for flatness testing, and (5b) is the top view of the fixture for flatness testing;

[0032] Figure 6 This is a schematic diagram of the motor's structure;

[0033] Figure 7 This is a schematic diagram of the stator and rotor structure;

[0034] Figure 8 This is a schematic diagram of the motor bracket structure;

[0035] Explanation of reference numerals in the attached drawings: 1. Support plate; 2. Bracket fixing plate; 3. First plane bearing; 4. Connecting shaft; 5. Pressure plate; 6. Screw; 7. Universal magnetic base; 8. Dial indicator; 9. Detection shaft; 10. Motor bracket to be tested; 11. Spring; 12. Flat washer; 13. Second plane bearing. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0037] Example 1

[0038] This embodiment provides a fixture for testing the coaxiality and flatness of a motor bracket, such as... Figure 1 As shown, it includes a support plate 1, a bracket fixing plate 2, and a dial indicator 8. A first plane bearing 3 is fixedly mounted on the support plate 1, and a connecting shaft 4 passes through the support plate 1 and the bracket fixing plate 2 and slides in cooperation with the first plane bearing 3, thereby rotatably connecting the bracket fixing plate 2 and the support plate 1.

[0039] The bracket fixing plate 2 is equipped with multiple positioning components (such as...Figure 2 The A / A1, B / B1, and C / C1 components can be used to position different models of motor brackets to be tested, giving the fixture a wide range of applications and good economic efficiency. Each positioning component includes multiple positioning holes, the distribution of which matches the distribution of positioning protrusions on the corresponding model of the motor bracket to be tested. A pressure plate 5 is provided above each positioning hole to further press the positioned motor bracket to be tested onto the bracket fixing plate 2. The pressure plate 5 can be tightened or loosened by screws 6.

[0040] In a preferred embodiment, a buffer pad is provided on the side of the pressure plate 5 that contacts the motor bracket under test, which can prevent the motor bracket under test from sliding and at the same time make the motor bracket under test evenly stressed and prevent deformation.

[0041] In a preferred embodiment, a height-variable elastic component is provided between the end of the pressure plate 5 away from the motor bracket to be tested and the bracket fixing plate 2. The elastic component can be a spring or elastic rubber. This setting can also ensure that the motor bracket to be tested is subjected to uniform force and is more stable during the testing process.

[0042] In a preferred embodiment, the side of the bracket fixing plate 2 closest to the support plate 1 is machined using a lathe and a grinding machine, such as... Figure 3 As shown in (3b), the shaded areas are retained, and the blank areas are removed using a lathe and grinder to form multiple concentric annular bosses. Figure 3 As shown in (3a), the height of the boss after machining is about 0.5mm. The above setting can reduce the friction between the bracket fixing plate 2 and the support plate 1 when rotating, while ensuring the stability during rotation.

[0043] In a preferred embodiment, the side of the bracket fixing plate 2 closest to the support plate 1 is polished to further reduce measurement errors caused by frictional resistance.

[0044] In a preferred embodiment, the bottom of the support plate 1 is provided with an anti-slip rubber pad to ensure the stability of the fixture during the measurement process.

[0045] The dial indicator 8 is used to measure the coaxiality and flatness data of the motor bracket under test. The dial indicator 8 is connected to the universal magnetic base 7 through a universal connecting rod. The universal connecting rod is sleeved on the universal magnetic base 7 and is adjusted and fixed by a nut. The universal magnetic base 7 is fixed to the edge of the support plate 1 by a magnetic switch.

[0046] Example 2

[0047] This embodiment provides a method for detecting the coaxiality and flatness of a motor bracket based on the motor bracket coaxiality and flatness detection fixture as described in Embodiment 1, wherein the coaxiality detection includes the following steps:

[0048] S1, such asFigure 4 As shown in (4a), a second planar bearing 13 is installed in the bearing chamber of the motor bracket 10 to be tested, the test shaft 9 is passed through the second planar bearing 13, the spring 11 is fitted into the test shaft 9, and a planar shim 12 is placed on top of the spring 11.

[0049] S2. Align the positioning point of the motor bracket 10 to be tested with the positioning hole on the bracket fixing plate 2 and press it tightly. Adjust the pressure plate 5 to fix the motor bracket 10 to be tested onto the bracket fixing plate 2.

[0050] S3. Adjust the position of dial indicator 8, such as... Figure 4 As shown in (4b), make its probe contact the circumferential surface of the detection shaft 9, rotate the bracket fixing plate 2 one revolution, confirm that the probe is adjusted in place, and read the coaxiality data from the dial indicator 8.

[0051] Flatness inspection includes the following steps:

[0052] After completing the coaxiality test, adjust the position of dial indicator 8, such as... Figure 5 As shown in (5a) and (5b), make the probe connect with the lowest point of the motor bracket 10 to be tested, rotate the bracket fixing plate 2 one revolution, confirm that the probe is adjusted in place, and read the flatness data from the dial indicator 8.

[0053] The above method can test both coaxiality and flatness in one clamping, which is convenient and improves the testing efficiency. At the same time, the positioning holes on the bracket fixing plate 2 are equivalent to the positioning slots of the stator, making the test closer to the actual state after the motor bracket and stator are assembled. It can accurately detect whether the cumulative error of the motor bracket after assembly meets the technical requirements.

[0054] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A fixture for testing the coaxiality and flatness of a motor bracket, characterized in that, Includes a support plate (1), a bracket fixing plate (2), and a dial indicator (8); A first planar bearing (3) is fixedly provided on the support plate (1). A connecting shaft (4) passes through the support plate (1) and the bracket fixing plate (2) and slides with the first planar bearing (3) to rotatably connect the bracket fixing plate (2) and the support plate (1). The bracket fixing plate (2) is provided with multiple positioning components for positioning different models of motor brackets to be tested. Each positioning component includes multiple positioning holes. The distribution of each positioning hole matches the distribution of the positioning protrusions of the corresponding model of the motor bracket to be tested. A pressure plate (5) is provided above each positioning hole for further pressing the positioned motor bracket to be tested onto the bracket fixing plate (2). The dial indicator (8) is used to measure the coaxiality data and flatness data of the motor bracket to be tested. The dial indicator (8) is connected to the universal magnetic base (7) through a universal connecting rod. The universal magnetic base (7) is fixed to the edge of the support plate (1) through a magnetic switch.

2. The motor bracket coaxiality and flatness testing fixture according to claim 1, characterized in that, The side of the bracket fixing plate (2) near the support plate (1) is machined by a lathe and a grinding machine to form multiple concentric annular bosses.

3. The motor bracket coaxiality and flatness testing fixture according to claim 1, characterized in that, The side of the bracket fixing plate (2) near the support plate (1) is polished.

4. The motor bracket coaxiality and flatness testing fixture according to claim 1, characterized in that, The bottom of the support plate (1) is provided with an anti-slip rubber pad.

5. The motor bracket coaxiality and flatness testing fixture according to claim 1, characterized in that, The pressure plate (5) can be tightened or loosened by adjusting the screw (6).

6. The motor bracket coaxiality and flatness testing fixture according to claim 1, characterized in that, A buffer pad is provided on the side of the pressure plate (5) that contacts the motor bracket to be tested.

7. A fixture for detecting the coaxiality and flatness of a motor bracket according to claim 1, characterized in that, A height-variable elastic component is provided between the end of the pressure plate (5) away from the motor bracket to be tested and the bracket fixing plate (2).

8. A fixture for detecting the coaxiality and flatness of a motor bracket according to claim 7, characterized in that, The elastic component is a spring or elastic rubber.

9. A fixture for detecting the coaxiality and flatness of a motor bracket according to claim 1, characterized in that, The universal joint is sleeved on the universal magnetic base (7) and fixed by adjustment with a nut.

10. A method for detecting the coaxiality and flatness of a motor bracket based on a motor bracket coaxiality and flatness detection fixture as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Install the second plane bearing in the bearing chamber of the motor bracket to be tested, pass the test shaft through the second plane bearing, put the spring into the test shaft, and place a flat shim on the top of the spring. S2. Align the positioning point of the motor bracket to be tested with the positioning hole on the bracket fixing plate and press it tightly. Adjust the pressure plate to fix the motor bracket to be tested onto the bracket fixing plate. S3. Adjust the position of the dial indicator so that its probe is in contact with the circumferential surface of the detection shaft. Rotate the bracket fixing plate one revolution and read the coaxiality data from the dial indicator. S4. Adjust the position of the dial indicator so that its probe is in contact with the lowest point of the motor bracket to be tested. Rotate the bracket fixing plate one revolution and read the flatness data from the dial indicator.

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