Motor driving cover bolt protruding height detection device

Abstract

The utility model belongs to the technical field of motor production, and particularly relates to a motor driving cover bolt protruding height detection device which comprises a sleeve and a dial indicator inserted above the sleeve. The lower end face of the sleeve is a plane perpendicular to the axis. A sliding rod and an elastic piece are arranged in the sleeve, the sliding rod is located below the dial indicator and is in axial sliding fit with the sleeve, and the sliding rod and the dial indicator are arranged at intervals through the elastic piece. An upper limiting part and a lower limiting part are arranged on the sliding rod, and a clamping part located between the upper limiting part and the lower limiting part is arranged on the sleeve; the device further comprises a calibration shaft and an axial limiting plate, when the calibration shaft is located in the sleeve and the axial limiting plate upwards abuts against the lower end face of the sleeve, the calibration shaft upwards abuts against the sliding rod, and the sliding rod upwards compresses the measuring head of the measuring rod on the dial indicator. During measurement, the lower end face of the sleeve abuts against the top face of the driving cover on the two sides of the bolt simultaneously, perpendicularity of the sleeve relative to the upper end face of the driving cover is guaranteed, and measurement precision is improved. The dial indicator visually and accurately displays a measured value, thereby saving manpower and improving detection efficiency.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor production technical field, concretely relates to a motor drive cover bolt protruding height detection device. BACKGROUND

[0002] The pin needs to be assembled on the drive cover of the motor in the starting motor assembly process, and the specific structure is shown as Figure 1 and Figure 2 , the drive cover 11 is provided with a groove, the bottom wall of the groove is provided with a blind hole, the axis of the blind hole is perpendicular to the bottom wall of the groove, the bolt 12 is inserted into the blind hole of the bottom wall of the groove and protrudes from the top surface of the drive cover 11. In order to ensure the smooth progress of the subsequent assembly process, the height dimension of the bolt 12 protruding from the drive cover 11 needs to be measured after the bolt 12 is assembled. At present, the height gauge is mainly used to measure the protruding height of the bolt 12 in the production site, but it is not easy to ensure the flatness of the height gauge base during the measurement process, and then it is difficult to ensure that the measuring rod of the height gauge is perpendicular to the top surface of the drive cover 11, the measurement operation error is large and the operation is inconvenient, and the detection efficiency is low. CONTENT OF THE UTILITY MODEL

[0003] The utility model solves the technical problem that: provide a motor drive cover bolt protruding height detection device, improve the height measurement precision and measurement efficiency of the bolt assembled on the motor drive cover.

[0004] The utility model adopts the technical scheme in the technical problem: a motor drive cover bolt protruding height detection device, including sleeve and dial gauge, the measuring rod of dial gauge is fixedly inserted in sleeve and coaxial arrangement, dial gauge is located sleeve top, sleeve lower end surface is the plane perpendicular to its axis,

[0005] The sleeve is provided with a sliding rod and an elastic element, the sliding rod is located below the dial gauge and is axially slidingly connected with the sleeve, the upper end of the elastic element is connected with the sleeve, and the lower end of the elastic element is axially abutted with the sliding rod, so that the sliding rod and the dial gauge are arranged at intervals;

[0006] The outer side wall of the sliding rod is provided with an upper limiting portion and a lower limiting portion arranged at intervals, the sleeve is provided with a clamping portion located between the upper limiting portion and the lower limiting portion, and the clamping portion is axially slidingly connected with the sliding rod along the axis of the sliding rod.

[0007] Further comprising the calibration shaft arranged outside the sleeve, the lower end of the calibration shaft is provided with an axial limiting plate perpendicular to its axis; when the calibration shaft is located in the sleeve and the axial limiting plate is upwardly abutted with the lower end surface of the sleeve, the calibration shaft is upwardly abutted with the sliding rod, and the sliding rod compresses the measuring head of the measuring rod of the dial gauge.

[0008] Furthermore, the lower part of the sleeve is provided with reference plates protruding from its outer side wall on both sides, and the lower end surface of the reference plate is a planar structure and is flush with the lower end surface of the sleeve.

[0009] Furthermore, the outer surface of the sleeve includes two parallel milled flat surfaces.

[0010] Furthermore, the snap-fit ​​part is a snap-fit ​​bolt arranged radially along the sleeve, the snap-fit ​​bolt passing through the side wall of the sleeve and threadedly connected to the side wall of the sleeve.

[0011] Furthermore, the outer wall of the sliding rod is provided with an annular groove coaxial with it, and the locking part is located in the annular groove;

[0012] The upper sidewall of the annular groove is the upper limit portion, and the lower sidewall of the annular groove is the lower limit portion.

[0013] Furthermore, the inner wall of the sleeve is provided with a protrusion, and the protrusion is provided with a lower limiting surface, and the upper end of the elastic element abuts against the lower limiting surface of the protrusion.

[0014] Furthermore, the elastic element is a compression spring.

[0015] Furthermore, a guide rod segment is provided on the top surface of the sliding rod. The guide rod segment and the sliding rod are integrally formed. The outer diameter of the guide rod segment is smaller than the outer diameter of the sliding rod, and the two have a stepped surface directly between them.

[0016] The compression spring is sleeved on the outside of the guide rod section, and the lower end of the compression spring abuts against the step surface.

[0017] Furthermore, the sleeve and the sleeve are connected via a dial indicator connector;

[0018] The dial indicator connector is sleeved on the outside of the sleeve to clamp and fix the measuring rod of the sleeve. The lower part of the dial indicator connector is located inside the sleeve and is threadedly connected to the inner wall of the sleeve.

[0019] The upper end of the elastic element abuts against the lower end surface of the dial indicator connector.

[0020] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model provides a device for detecting the protrusion height of a motor drive cover pin. By setting a calibration shaft to extend into the sleeve and push the sliding rod upwards, the sliding rod presses against the measuring head of a dial indicator, thus completing the dial indicator zeroing operation. An axial limiting plate ensures that the length of the calibration shaft extending into the sleeve is the same during dial indicator zeroing, thereby ensuring the same compression of the measuring head during multiple zeroing processes, and thus ensuring the same sensitivity of the dial indicator during multiple measurements, reducing errors in multiple measurements and ensuring the consistency of measurement standards. By setting the lower end face of the sleeve as a plane to ensure that it simultaneously abuts against the top surfaces of the drive covers on both sides of the pin during measurement, the perpendicularity of the sleeve and the dial indicator relative to the upper end face of the motor drive cover is ensured, reducing pin measurement errors and improving measurement accuracy. By setting the dial indicator to quickly, intuitively, and accurately read the measured values, and comparing them with the limit deviations required by the process, the installation accuracy of the pin can be quickly and accurately determined to meet the process requirements, saving manpower and improving testing efficiency. By incorporating an elastic element, the sliding rod and the dial indicator do not come into contact when idle, thus preventing wear on the dial indicator's measuring rod, ensuring the device's measurement accuracy, and extending its service life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the axial structure of the motor drive cover and pin assembly structure in the background art;

[0022] Figure 2 This is a cross-sectional view of the assembly structure of the motor drive cover and the pin in the background art.

[0023] Figure 3 This is a schematic diagram of the axial side structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the axial cross-sectional structure of the dial indicator during zeroing.

[0025] Figure 5 This is an axial cross-sectional view of the structure of this utility model when the calibration shaft is located outside the sleeve;

[0026] Figure 6 This is a schematic diagram of the axonal structure of the product measured by this utility model;

[0027] Figure 7 This is a cross-sectional structural diagram of the product measured by this utility model;

[0028] Reference numerals: 11-Drive cover; 12-Pin; 2-Sleeve; 21-Snap-fit ​​part; 22-Base plate; 23-Milled flat surface; 3-Sliding rod; 31-Upper limit part; 32-Lower limit part; 33-Guide rod section; 4-Elastic element; 51-Calibration shaft; 52-Lower limit plate; 6-Dial indicator connector; 9-Dial indicator. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. In the present invention, the basic design dimension of the height of the pin 12 protruding from the top surface of the drive cover 11 is H, and its allowable upper limit deviation is a1, and its lower limit deviation is a2.

[0030] like Figures 3-7 As shown, a device for detecting the protrusion height of a motor-driven cover pin includes a sleeve 2 and a dial indicator 9. The measuring rod of the dial indicator 9 is fixedly inserted into the sleeve 2 and the two are arranged coaxially. The dial indicator 9 is located above the sleeve 2. The lower end face of the sleeve 2 is a plane perpendicular to its axis. A sliding rod 3 and an elastic element 4 are provided inside the sleeve 2. The sliding rod 3 is located below the dial indicator 9 and slides axially with the sleeve 2. The upper end of the elastic element 4 is connected to the sleeve 2, and the lower end of the elastic element 4 abuts axially with the sliding rod 3, so that the sliding rod 3 and the dial indicator 9 are spaced apart. The outer wall of the sliding rod 3 is provided with... The sleeve 2 has an upper limit part 31 and a lower limit part 32 arranged at intervals. The sleeve 2 is provided with a locking part 21 located between the upper limit part 31 and the lower limit part 32. The locking part 21 slides with the sliding rod 3 along the axial direction of the sliding rod 3. The sleeve 2 also includes a calibration shaft 51 located on the outside of the sleeve 2. The lower end of the calibration shaft 51 is provided with an axial limiting plate 52 perpendicular to its axis. When the calibration shaft 51 is located inside the sleeve 2 and the axial limiting plate 52 abuts upward against the lower end face of the sleeve 2, the calibration shaft 51 abuts against the sliding rod 3, and the sliding rod 3 compresses the measuring head of the measuring rod on the dial indicator 9 upward.

[0031] The dial indicator 9 is fixed in axial position relative to the sleeve 2, and the measuring head of the measuring rod on the dial indicator 9 is located at the lower end of the measuring rod. When the dial indicator meets the measurement accuracy, it can also be used instead of the dial indicator 9. The length of the calibration shaft 51 is the same as the design height of the pin 12 protruding from the top surface of the drive cover 11. The outer diameter of the calibration shaft 51, the outer diameter of the pin 12 protruding from the drive cover 11, and the diameter of the lower port of the sleeve 2 are the same. In the static state, the sliding rod 3 is spaced apart from the measuring head at the lower end of the measuring rod on the dial indicator 9 under the tension of the elastic element 4. The sliding rod 3 and the dial indicator 9 do not contact each other, avoiding wear of the measuring rod of the dial indicator 9 by the sliding rod 3, and ensuring the measurement accuracy and service life of the device. When the axis of the sleeve 2 is set in the vertical direction, the sliding rod 3 slides down under the action of gravity. The locking part 21 supports the upper limit part 31 to limit the sliding rod 3, preventing the sliding rod 3 from falling out of the sleeve 2.

[0032] Before using this utility model to test the axial installation accuracy of the pin, the calibration shaft 51 should be inserted into the lower end of the sleeve 2. The calibration shaft 51 pushes the sliding rod 3 to compress the elastic element 4 and presses the measuring head of the dial indicator 9 until the upper end face of the axial limiting plate 52 is in contact with the lower end face of the sleeve 2. Then the dial indicator 9 is zeroed. After calibration, the dial indicator 9 is zeroed. Then the calibration shaft 51 is removed from the sleeve 2. The elastic element 4 rebounds and the sliding rod 3 is reset. Then the height of the pin 12 protruding from the motor drive cover 11 is measured. This invention uses a calibration shaft 51 that extends into the sleeve 2 to push the sliding rod 3 upwards, causing the sliding rod 3 to press the measuring head of the dial indicator 9 to zero the dial indicator 9. By setting an axial limiting plate 51, it ensures that the length of the calibration shaft 51 extending into the sleeve 2 is the same when the dial indicator 9 is zeroed. This ensures that the compression of the measuring head of the dial indicator 9 is the same during multiple zeroing processes, thereby ensuring that the sensitivity of the dial indicator 9 is the same during multiple measurements, reducing errors during multiple measurements, and ensuring the consistency of measurement standards.

[0033] During measurement, sleeve 2 is fitted over the outside of pin 12, with the lower end face of sleeve 2 simultaneously abutting against the top surfaces of the drive covers 11 on both sides of pin 12. The dial indicator 9 is then observed and its reading recorded: if the reading A ≥ a2 and A ≤ a1, the height of pin 12 protruding from the drive cover 11 meets the quality requirements; if the reading A > a1, the length of pin 12 protruding from the drive cover 11 is too large; if the reading A < a1, the length of pin 12 protruding from the drive cover 11 is insufficient. Based on the reading of dial indicator 9, the installation accuracy of pin 12 can be quickly and intuitively determined to meet the process requirements, saving manpower and improving testing efficiency. Compared to using a height gauge to measure the height of the pin 12, this utility model sets the lower end face of the sleeve 2 as a plane to ensure that it simultaneously abuts against the top surface of the drive cover 11 on both sides of the pin 12 during measurement, thus ensuring the perpendicularity of the sleeve 2 relative to the upper end face of the motor drive cover 11, reducing the measurement error of the pin 12, and improving the measurement accuracy.

[0034] During measurement, the sleeve 2 is used to horizontally position the entire measuring device by fitting it around the outside of the pin 12. The lower end face of the sleeve 2 abuts against the top surface of the motor drive cover 11, ensuring that the dial indicator 9 is perpendicular to the top surface of the motor drive cover 11. The sleeve 2 can be a straight cylinder or a stepped sleeve structure. Considering the large gap between the pin 12 and the groove sidewall of the drive cover 11, generally greater than 10mm on one side, if the sleeve 2 is set as a straight cylinder and its lower end face abuts against the top surface of the drive cover 11, the sleeve 2 will be large in size and weight, which is not only inconvenient to use but also wastes raw materials. Preferably, the lower part of the sleeve 2 has reference plates 22 protruding from its outer sidewall on both sides. The lower end face of the reference plate 22 is a planar structure and flush with the lower end face of the sleeve 2. In this case, the sleeve 2 is a stepped sleeve structure, which reduces the size and weight of the sleeve 2, reduces the size and weight of the entire measuring device, facilitates handling and measurement operations, saves manpower, and improves work efficiency. During measurement, the lower end face of the reference plate 22 abuts against the top surface of the drive cover 11. The reference plate 22 can be a ring plate structure or a sleeve structure. As a further preferred embodiment, the outer surface of the sleeve 2 includes two parallel milled flat surfaces 23, which facilitates gripping, positioning, and use.

[0035] The snap-fit ​​portion 21 on the sleeve 2 has various structural forms, such as a locating pin inserted radially into the sleeve 2, or a bolt threadedly connected to the sleeve 2. Preferably, the snap-fit ​​portion 21 is a snap-fit ​​bolt arranged radially along the sleeve 2, which passes through the side wall of the sleeve 2 and is threadedly connected to the side wall of the sleeve 2. This structure is simple and convenient for assembly and disassembly.

[0036] During measurement operations or zeroing operations of the dial indicator 9, the sliding rod 3 is used to push the measuring head of the dial indicator 9 upwards. Generally, the maximum outer diameter of the sliding rod 3 is the same as the inner diameter of the sleeve 2 to ensure that the sliding rod 3 is parallel to the sleeve 2 and to ensure smooth sliding along the axial direction of the sleeve 2 within the sleeve 2, thereby improving measurement accuracy. The upper limit part 31 and the lower limit part 32 can be a limiting plate protruding from the outer wall of the sleeve 2, or they can be the upper and lower side walls of the limiting groove. Preferably, the outer side wall of the sliding rod 3 is provided with an annular groove coaxial with it, the locking part 21 is located in the annular groove, the upper side wall of the annular groove is the upper limit part 31, and the lower side wall of the annular groove is the lower limit part 32. The structure is simple and easy to manufacture.

[0037] The elastic element 4 is used to separate the sliding rod 3 and the measuring rod of the dial indicator 9 when the device is stationary. The upper end of the elastic element 4 can be glued, snapped, or abutted against the sleeve 2. Preferably, the inner wall of the sleeve 2 has a protrusion with a lower limiting surface. The upper end of the elastic element 4 abuts against the lower limiting surface of the protrusion, which facilitates the assembly of the elastic element 4. The protrusion can be a structure of multiple protrusions arranged circumferentially along the sleeve, or it can be a ring plate structure. The elastic element 4 can be a rubber column, a rubber sleeve, or a spring. As a further preferred option, the elastic element 4 is a compression spring, which is easier to obtain and saves costs compared to other elastic elements. As an even further preferred option, the top surface of the sliding rod 3 has a guide rod section 33, which is an integral structure formed by the sliding rod 3. The outer diameter of the guide rod section 33 is smaller than the outer diameter of the sliding rod 3, and the two have a stepped surface directly. The compression spring is sleeved on the outside of the guide rod section 33, and the lower end of the compression spring abuts against the stepped surface. By setting guide rod segment 33, the compression spring can be extended and retracted along its axial direction, thus extending the service life of the compression spring.

[0038] The calibration shaft 51 extends into the sleeve 2 to push the sliding rod 3 upwards, causing the sliding rod 3 to compress the elastic element 4 and thus compress the measuring end of the dial indicator 9. The lower limit plate 52 abuts against the lower end face of the sleeve 2 to axially limit the calibration shaft 51, ensuring that the calibration shaft 51 is fully inserted into the sleeve 2. This ensures that the upward stroke of the sliding rod 3 and the axial compression stroke of the measuring end of the dial indicator 9 are the same during multiple zeroing processes, thereby ensuring the measurement accuracy of the entire measuring device. The calibration shaft 51 can be a stepped shaft or a smooth shaft, and the lower limit plate 52 protrudes from the side wall of the calibration shaft 51.

[0039] The dial indicator 9 can be fixedly mounted on the upper part of the sleeve 2 using adapters such as set screws, bolts, or clamps. The head of the dial indicator 9 is located on the outer side of the sleeve 2. Specifically, a set screw is threaded onto the wall of the sleeve 2, with its axial direction arranged radially along the sleeve 2. The set screw presses against the measuring rod of the dial indicator 9, and the set screw cooperates with the inner wall of the sleeve 2 to clamp and fix the measuring rod of the dial indicator 9. However, the set screw can easily deform the measuring rod of the dial indicator 9 by squeezing. Preferably, the dial indicator 9 and the sleeve 2 are connected by a dial indicator connector 6. The dial indicator connector 6 is sleeved on the outer side of the dial indicator 9 to clamp and fix the measuring rod of the dial indicator 9, and the lower part of the dial indicator connector 6 is located inside the sleeve 2 and threadedly connected to the inner wall of the sleeve 2. This structure is simple, reduces the probability of damaging the measuring rod of the dial indicator 9, and improves the service life of the dial indicator 9. The aforementioned dial indicator connector 6 is a standard externally purchased part, which can be obtained from MISUMI (China) Precision Machinery Trading Co., Ltd. or other sources. For example, the dial indicator connector 6 can be the DGHL1 model dial indicator connector sold by MISUMI (China) Precision Machinery Trading Co., Ltd. For details on the shape and dimensions of the dial indicator connector, please refer to the official website of MISUMI (China) Precision Machinery Trading Co., Ltd. This design allows the upper end of the elastic element 4 to abut against the lower end surface of the dial indicator connector 6, eliminating the need for a corresponding structure connected to the upper end of the elastic element 4 within the sleeve 2, thus simplifying the structure of the sleeve 2.

[0040] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for detecting the protrusion height of a motor-driven cover pin, comprising a sleeve (2) and a dial indicator (9), wherein the measuring rod of the dial indicator (9) is fixedly inserted into the sleeve (2) and the two are arranged coaxially, and the dial indicator (9) is located above the sleeve (2); characterized in that: The lower end face of the sleeve (2) is a plane perpendicular to its axis; The sleeve (2) is provided with a sliding rod (3) and an elastic element (4). The sliding rod (3) is located below the dial indicator (9) and slides axially with the sleeve (2). The upper end of the elastic element (4) is connected to the sleeve (2), and the lower end of the elastic element (4) abuts against the sliding rod (3) circumferentially, so that the sliding rod (3) and the dial indicator (9) are arranged at intervals. The sliding rod (3) has an upper limit part (31) and a lower limit part (32) arranged at intervals on its outer side wall. The sleeve (2) has a snap-fit ​​part (21) located between the upper limit part (31) and the lower limit part (32). The snap-fit ​​part (21) slides with the sliding rod (3) along the axial direction of the sliding rod (3). It also includes a calibration shaft (51) disposed on the outside of the sleeve (2), and the lower end of the calibration shaft (51) is provided with an axial limiting plate (52) perpendicular to its axis; when the calibration shaft (51) is located inside the sleeve (2) and the axial limiting plate (52) abuts against the lower end face of the sleeve (2) upward, the calibration shaft (51) abuts against the sliding rod (3), and the sliding rod (3) compresses the measuring head of the measuring rod on the dial indicator (9) upward.

2. The device for detecting the protrusion height of the motor-driven cover pin according to claim 1, characterized in that: The lower part of the sleeve (2) is provided with reference plates (22) protruding from its outer side wall on both sides. The lower end surface of the reference plate (22) is a planar structure and is flush with the lower end surface of the sleeve (2).

3. The device for detecting the protrusion height of the motor-driven cover pin according to claim 2, characterized in that: The outer surface of the sleeve (2) includes two parallel milled flat surfaces (23).

4. The device for detecting the protrusion height of the motor-driven cover pin according to claim 1, characterized in that: The snap-fit ​​part (21) is a snap-fit ​​bolt arranged radially along the sleeve (2), and the snap-fit ​​bolt passes through the side wall of the sleeve (2) and is threadedly connected to the side wall of the sleeve (2).

5. The device for detecting the protrusion height of the motor-driven cover pin according to claim 1, characterized in that: The sliding rod (3) has an annular groove on its outer side wall, which is coaxial with it, and the snap-fit ​​part (21) is located in the annular groove; The upper sidewall of the annular groove is the upper limit part (31), and the lower sidewall of the annular groove is the lower limit part (32).

6. The device for detecting the protrusion height of the motor-driven cover pin according to claim 1, characterized in that: The inner wall of the sleeve (2) is provided with a protrusion, and the protrusion is provided with a lower limiting surface. The upper end of the elastic element (4) abuts against the lower limiting surface of the protrusion.

7. The device for detecting the protrusion height of the motor-driven cover pin according to claim 1, characterized in that: The elastic element (4) is a compression spring.

8. The device for detecting the protrusion height of the motor-driven cover pin according to claim 7, characterized in that: The top surface of the sliding rod (3) is provided with a guide rod section (33), the guide rod section (33) and the sliding rod (3) are integrally formed, the outer diameter of the guide rod section (33) is smaller than the outer diameter of the sliding rod (3) and the two have a stepped surface directly; The compression spring is sleeved on the outside of the guide rod section (33), and the lower end of the compression spring abuts against the step surface.

9. The device for detecting the protrusion height of the motor-driven cover pin according to any one of claims 1-8, characterized in that: The dial indicator (9) and the sleeve (2) are connected by a dial indicator connector (6); The dial indicator connector (6) is sleeved on the outside of the dial indicator (9) to clamp and fix the measuring rod of the dial indicator (9). The lower part of the dial indicator connector (6) is located inside the sleeve (2) and is threadedly connected to the inner wall of the sleeve (2). The upper end of the elastic element (4) abuts against the lower end surface of the dial indicator connector (6).

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