Motor shell roundness and end face perpendicularity detection device

Abstract

This utility model discloses a device for detecting the roundness and end face perpendicularity of a motor housing, including a base, a first support, a second support, a turntable, a bearing, a first displacement measuring instrument, and a second displacement measuring instrument. The first and second supports are fixedly mounted on the base. The turntable is rotatably mounted on the center of the base via the bearing. The turntable has an annular groove near its outer periphery. The first displacement measuring instrument is movably mounted on the first support and configured to contact the outer diameter of the motor housing. The second displacement measuring instrument is movably mounted on the second support and configured to contact the upper end face of the motor housing. This utility model, through structural improvements, avoids scratching damage to the paint surface of the motor housing during the detection process, while significantly improving detection efficiency and measurement results.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts testing devices. More specifically, this utility model relates to a device for testing the roundness and end face perpendicularity of a motor housing. Background Technology

[0002] In the manufacturing process of automotive motor housings, strict precision requirements are placed on the roundness of their outer diameter and the perpendicularity of their end faces to the axis. A common inspection method involves placing the motor housing on a V-block, manually rotating it, and using a dial indicator to measure the runout of the outer diameter and end faces, thereby calculating the roundness and perpendicularity errors. However, this method has significant drawbacks: the outer surface of the motor housing is usually coated with protective paint, and repeated rotation and friction on the V-block can easily scratch the paint, affecting the product's appearance and rust-proof performance. Furthermore, this method is time-consuming per piece, taking approximately four minutes, resulting in low efficiency. It is also susceptible to errors introduced by the operator's subjective judgment, which is detrimental to quality control and improving production cycle time. Utility Model Content

[0003] The purpose of this invention is to provide a device for detecting the roundness and perpendicularity of the motor housing. Through structural improvements, it avoids scratching damage to the paint surface of the motor housing during the detection process, while significantly improving detection efficiency and measurement results.

[0004] Another objective of this invention is to achieve automated acquisition and output of test data, providing a reliable data foundation for subsequent quality analysis and process control, and improving the modernization level of the testing process.

[0005] The technical solution adopted by this utility model to solve this technical problem is: a device for detecting the roundness and perpendicularity of the motor housing and the end face, including a base, a first bracket, a second bracket, a turntable, a bearing, a first displacement measuring instrument, and a second displacement measuring instrument;

[0006] The first bracket and the second bracket are fixedly mounted on the base. The turntable is rotatably mounted on the center position of the base via a bearing. The turntable has an annular groove near its outer periphery. The first displacement measuring instrument is movable up and down and mounted on the first bracket and configured to contact the outer diameter of the motor housing. The second displacement measuring instrument is movable up and down and mounted on the second bracket and configured to contact the upper end face of the motor housing.

[0007] As a further embodiment of this utility model, a first protective gasket is provided on the inner circumference of each annular groove.

[0008] As a further embodiment of this utility model, the first bracket and the second bracket are cylindrical structures with smooth surfaces. Both the first bracket and the second bracket are provided with horizontal cantilever arms that can be adjusted up and down. The horizontal cantilever arms are locked and fixed to the first bracket / second bracket by locking bolts.

[0009] The first and second displacement measuring instruments are detachably fixed to the corresponding transverse cantilever.

[0010] As a further embodiment of this utility model, four positioning components are evenly distributed along the circumferential direction on the upper surface of the turntable.

[0011] The positioning component includes a hand-tightening screw and a T-shaped post; the T-shaped post is fixed upside down on the surface of the turntable, and a horizontally arranged screw hole is opened on the T-shaped post. The hand-tightening screw is screwed onto the T-shaped post and configured to contact the inner wall of the motor housing.

[0012] As a further embodiment of this utility model, a second protective gasket is fixed to the end of the hand-tightening screw facing the inner wall of the motor housing.

[0013] As a further aspect of this utility model, both the first displacement measuring instrument and the second displacement measuring instrument are dial indicators.

[0014] A further embodiment of this utility model is: it also includes a cover body, which is a frustum-shaped structure, with the diameter of the small disc at the bottom being equal to the inner diameter of the motor housing, and the diameter of the large disc at the top being greater than the inner diameter of the motor housing.

[0015] As a further aspect of this utility model, both the first displacement measuring instrument and the second displacement measuring instrument are inductive displacement sensors.

[0016] Also includes: data collectors;

[0017] The signal output terminal of the first displacement measuring instrument is connected to the first input channel of the data acquisition unit via a first signal line;

[0018] The signal output terminal of the second inductive displacement sensor is connected to the second input channel of the data acquisition unit via the second signal line;

[0019] The data output terminal of the data acquisition device is connected to the data output interface, which synchronously outputs the signal to an external computer.

[0020] This utility model offers at least the following advantages: The detection device provided by this utility model uses a turntable with an annular groove to support the motor housing, replacing the traditional V-block structure. This avoids rigid contact and sliding friction, effectively protecting the paint coating on the product surface. Secondly, the adjustable positioning components on the turntable, used in conjunction with protective pads, enable rapid and accurate centering of the workpiece while preventing scratches on its inner wall, further ensuring the integrity of the workpiece. The device employs a flexibly adjustable bracket and cantilever structure, adapting to motor housings of different lengths (although the motor housings produced by our company have different models, they are all products with the same diameter but different lengths), offering strong versatility and convenient operation. By using displacement measuring instruments (dial gauges or inductive sensors) in conjunction with rotation for measurement, detection efficiency is significantly improved, reducing the single-piece detection time to approximately two minutes. Furthermore, the technical solution using an inductive displacement sensor and data acquisition unit enables automatic, synchronous acquisition and digital output of measurement data, eliminating human reading errors and laying a solid foundation for statistical analysis of product quality, significantly improving the automation and intelligence level of the detection operation.

[0021] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a motor housing roundness and end face perpendicularity detection device according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a positioning component according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a motor housing roundness and end face perpendicularity detection device according to another embodiment of the present invention.

[0025] Among them, 1-motor housing, 2-base, 3-first bracket, 4-second bracket, 5-turntable, 6-bearing, 7-annular groove, 8-first protective pad, 9-second protective pad, 10-lateral cantilever, 11-locking bolt, 12-hand screw, 13-T-shaped column, 14-cover, 15-first displacement measuring instrument, 16-second displacement measuring instrument, 17-base. Detailed Implementation

[0026] The present invention will now be described in detail and completely with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be particularly noted that the technical solutions and features provided in the various parts of the present invention, including the following description, can be combined with each other without conflict.

[0027] Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the protection scope of the present invention.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, and the specific implementation process is as follows:

[0029] like Figure 1 As shown, this utility model provides a device for detecting the roundness and perpendicularity of a motor housing, including a base 2, a first bracket 3, a second bracket 4, a turntable 5, a bearing 6, a first displacement measuring instrument 15, and a second displacement measuring instrument 16;

[0030] The first bracket 3 and the second bracket 4 are fixedly mounted on the base 2. The turntable 5 is rotatably mounted on the center position of the base 2 via the bearing 6. The turntable 5 has an annular groove 7 near its outer periphery for mounting the motor housing 1. The first displacement measuring instrument is movable up and down and mounted on the first bracket 3 and configured to contact the outer diameter of the motor housing 1. The second displacement measuring instrument is movable up and down and mounted on the second bracket 4 and configured to contact the upper end face of the motor housing 1.

[0031] The process of using the detection device:

[0032] Workpiece installation: The operator places the motor housing 1 into the annular groove 7 of the turntable 5. The annular groove 7 provides positioning and support for the motor housing 1.

[0033] Instrument Adjustment: For radial measurement adjustment, the operator moves the first displacement measuring instrument up and down until its probe contacts the highest point of the outer circular surface of the motor housing 1 being measured. Typically, a certain amount of compression (i.e., preload) is applied to the probe, causing the instrument pointer to rotate approximately half a turn. Then, the first displacement measuring instrument is locked. For end-face measurement adjustment, the operator moves the second displacement measuring instrument up and down until its probe contacts a point on the end face of the motor housing 1 being measured. Similarly, a certain amount of preload is applied, and then the second displacement measuring instrument is locked.

[0034] Rotation Measurement: The operator manually rotates turntable 5 slowly and evenly, causing motor housing 1 to rotate one revolution. During this process: the probe of the first displacement measuring instrument moves radially with the undulations of the outer circular surface of motor housing 1. Its internal mechanism converts this displacement into a reading (the swing of the pointer on the mechanical dial or the change in the voltage signal of the digital sensor), recording the maximum and minimum radial runout values ​​of each point on the outer circular surface relative to the reference rotation axis. The probe of the second displacement measuring instrument moves axially with the undulations of the end face of motor housing 1, similarly recording the maximum axial runout values ​​of each point on the end face relative to the reference rotation axis.

[0035] Roundness calculation: The roundness error of motor housing 1 can be obtained by calculating the difference between the maximum and minimum readings of the first displacement measuring instrument during the entire rotation process. Perpendicularity calculation: The perpendicularity error of the end face of motor housing 1 to the outer diameter axis can be directly characterized by the maximum runout of the reading of the second displacement measuring instrument during the entire rotation process. The operator can determine whether the workpiece is qualified by comparing the calculated error value with the tolerance requirements specified in the drawing.

[0036] In another technical solution, a first protective gasket 8 is provided on the inner circumference of the annular groove 7. In this embodiment, the first protective gasket 8 is made of polyurethane with medium to high hardness (A80-A90).

[0037] In another technical solution, such as Figure 1 As shown, the first bracket 3 and the second bracket 4 are smooth-surfaced cylindrical structures, which can be cylindrical or square. The first bracket 3 and the second bracket 4 are detachably mounted on the base 2 via a seat 17 and bolts. Both the first bracket 3 and the second bracket 4 are provided with vertically adjustable transverse cantilever 10, which is locked to the first bracket 3 / second bracket 4 by locking bolts 11. The transverse cantilever 10 can be composed of two symmetrical detachable block structures, which are fixed to the first bracket 3 / second bracket 4 as a whole by locking bolts 11. The transverse cantilever 10 can be a block structure with a channel in its middle through which the first bracket 3 / second bracket 4 can pass. Locking bolts 11 are provided on the block structure, and the locking bolts 11 move toward the first bracket 3 / second bracket 4, thereby fixing the transverse cantilever 10 to the first bracket 3 / second bracket 4. The first displacement measuring instrument and the second displacement measuring instrument are detachably fixed to the corresponding transverse cantilever 10 by bolts and fixing seats.

[0038] In another technical solution, such as Figure 2As shown, in practical applications, we found that when the motor housing 1 is placed in the annular groove 7 of the turntable 5, due to the clearance fit between it and the annular groove 7, a slight eccentricity will occur during the rotation of the turntable 5, causing a certain error in the roundness measurement of the motor housing 1. In order to reduce this error, the device was improved: four positioning components are evenly distributed along the circumferential direction on the upper surface of the turntable 5.

[0039] The positioning component includes a hand-tightening screw 12 and a T-shaped post 13; the T-shaped post 13 is inverted and fixed to the surface of the turntable 5, and the T-shaped post 13 can be fixed by bolts. The T-shaped post 13 has a horizontally arranged screw hole, and the hand-tightening screw 12 is screwed onto the T-shaped post 13 and configured to contact the inner wall of the motor housing 1.

[0040] In another technical solution, a second protective washer 9 is fixed to one end of the hand-tightening screw 12 facing the inner wall of the motor housing 1. In this embodiment, the second protective washer 9 is fastened to the end face of the hand-tightening screw 12 by a countersunk screw, the head of which is completely submerged in the inner surface plane of the second protective washer 9. The second protective washer 9 is made of polyurethane with medium to high hardness (A80-A90).

[0041] In another technical solution, both the first and second displacement measuring instruments are dial indicators. In this embodiment, one dial indicator is placed on the outer diameter of the motor housing 1 and the other dial indicator is placed on the end face of the motor housing 1. By rotating the turntable 5, the roundness and end face perpendicularity of the product can be measured, saving 50% of the measurement time. The inspection of a motor housing 1 can be completed in just 2 minutes.

[0042] In another technical solution, such as Figure 3 As shown, it also includes a cover 14, which is a frustum-shaped structure. The diameter of the small disc at the bottom is equal to the inner diameter of the motor housing, and the diameter of the large disc at the top is greater than the inner diameter of the motor housing. When in use, it is installed on the top of the motor housing to open up the motor housing, which will improve the roundness.

[0043] In another technical solution, although the dial indicator is more efficient than existing technologies, it still mainly relies on manual reading and requires manual recording or input into the computer system. This is not conducive to the statistical analysis of product quality. In order to further improve production efficiency, realize the automation of quality control, and facilitate data analysis and traceability, in another embodiment, both the first displacement measuring instrument and the second displacement measuring instrument are inductive displacement sensors. In this embodiment, the first displacement measuring instrument is fixedly installed on the first bracket 3, and the probe of the first displacement measuring instrument is perpendicular to the axis of the motor housing 1 to be measured and contacts the outer diameter surface of the motor housing 1; the second displacement measuring instrument is fixedly installed on the second bracket 4, and the probe of the second displacement measuring instrument is parallel to the axis of the motor housing 1 to be measured and contacts the end face surface of the motor housing 1.

[0044] It also includes: a data acquisition unit; the signal output terminal of the first displacement measuring instrument is connected to the first input channel of the data acquisition unit via a first signal line; the signal output terminal of the second inductive displacement sensor is connected to the second input channel of the data acquisition unit via a second signal line; the data output terminal of the data acquisition unit is connected to a data output interface, which synchronously outputs signals to an external computer. In this embodiment, the data acquisition unit is configured to synchronously acquire the voltage signals of the first and second displacement measuring instruments during the rotation of the turntable 5, and convert the voltage signals into digital signals representing the displacement of the probe; the data output interface is configured to synchronously output the digital signal representing the displacement of the probe, the identification signal of the first displacement measuring instrument, and the identification signal of the second displacement measuring instrument to an external computer. In this embodiment, by using an inductive displacement sensor and adding a data acquisition unit and a data output interface, automated and synchronous acquisition and output of detection data are achieved, reducing manual labor and improving detection efficiency.

[0045] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and embodiments shown and described herein.

Claims

1. A device for detecting the roundness and perpendicularity of an motor housing, characterized in that, It includes a base, a first bracket, a second bracket, a turntable, bearings, a first displacement measuring instrument, and a second displacement measuring instrument; The first bracket and the second bracket are fixedly mounted on the base. The turntable is rotatably mounted on the center position of the base via a bearing. The turntable has an annular groove near its outer periphery. The first displacement measuring instrument is movable up and down and mounted on the first bracket and configured to contact the outer diameter of the motor housing. The second displacement measuring instrument is movable up and down and mounted on the second bracket and configured to contact the upper end face of the motor housing.

2. The motor housing roundness and end face perpendicularity detection device as described in claim 1, characterized in that, Each annular groove is provided with a first protective gasket.

3. The motor housing roundness and end face perpendicularity detection device as described in claim 2, characterized in that, The first and second supports are smooth cylindrical structures. Both the first and second supports are equipped with adjustable horizontal cantilever arms, which are locked and fixed to the first / second supports by locking bolts. The first and second displacement measuring instruments are detachably fixed to the corresponding transverse cantilever.

4. The motor housing roundness and end face perpendicularity detection device as described in claim 3, characterized in that, Four positioning components are evenly distributed along the circumference on the upper surface of the turntable. The positioning component includes a hand-tightening screw and a T-shaped post; the T-shaped post is fixed upside down on the surface of the turntable, and a horizontally arranged screw hole is opened on the T-shaped post. The hand-tightening screw is screwed onto the T-shaped post and configured to contact the inner wall of the motor housing.

5. The motor housing roundness and end face perpendicularity detection device as described in claim 4, characterized in that, A second protective washer is fixed to the end of the hand-tightening screw facing the inner wall of the motor housing.

6. The motor housing roundness and end face perpendicularity detection device as described in claim 3, characterized in that, Both the first displacement measuring instrument and the second displacement measuring instrument are dial gauges.

7. The motor housing roundness and end face perpendicularity detection device as described in claim 6, characterized in that, It also includes a cover, which is a frustum-shaped structure. The diameter of the small disc at the bottom is equal to the inner diameter of the motor housing, and the diameter of the large disc at the top is greater than the inner diameter of the motor housing.

8. The motor housing roundness and end face perpendicularity detection device as described in claim 4, characterized in that, Both the first displacement measuring instrument and the second displacement measuring instrument are inductive displacement sensors; Also includes: data collectors; The signal output terminal of the first displacement measuring instrument is connected to the first input channel of the data acquisition unit via a first signal line; The signal output terminal of the second displacement measuring instrument is connected to the second input channel of the data acquisition unit via a second signal line; The data output terminal of the data acquisition device is connected to the data output interface, which synchronously outputs the signal to an external computer.

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