CN222188275U - An inner and outer diameter comparison measuring instrument - Google Patents
An inner and outer diameter comparison measuring instrument Download PDFInfo
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- CN222188275U CN222188275U CN202420817370.3U CN202420817370U CN222188275U CN 222188275 U CN222188275 U CN 222188275U CN 202420817370 U CN202420817370 U CN 202420817370U CN 222188275 U CN222188275 U CN 222188275U
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- 238000005259 measurement Methods 0.000 description 39
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Abstract
The utility model discloses an inside and outside diameter comparison measuring instrument, wherein a first measuring head capable of extending out of a first plane is arranged at the bottom of a first mounting frame, a second measuring head capable of extending out of the bottom of a base is arranged at the bottom of a second mounting frame, a first knob is connected with the first mounting frame and can control the locking or unlocking state of the first mounting frame, when the first knob controls the first mounting frame to be in the unlocking state, the first knob can drive the first measuring head to move along the direction close to or far away from the second measuring head, the second knob is connected with the second mounting frame and can drive the second measuring head to move along the length direction of the base, and the measuring instrument comprises a gauge head and a measuring rod capable of penetrating through the gauge head.
Description
Technical Field
The utility model belongs to the technical field of measuring equipment, and particularly relates to an inside and outside diameter comparison measuring instrument.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The conventional inner diameter or outer diameter measuring tool is basically single in function, namely a single measuring tool can only measure a plurality of corresponding sizes, the conventional caliper is convenient to measure and use but low in measurement accuracy, the inner diameter micrometer or inner diameter meter is high in measurement accuracy but single in measurement application scene, and various customized inner diameter or outer diameter measuring tools are high in customization price and only suitable for corresponding measured sizes.
When a conventional workpiece to be measured is to measure all the inner dimensions or the outer dimensions, a plurality of measuring tools or even a special measuring tool is required to be used according to the measured dimensions.
It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present utility model and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the utility model section.
Disclosure of utility model
In order to overcome the defects in the prior art, the utility model provides an inside and outside diameter comparison measuring instrument which can be used for measuring the inside diameter or the outside diameter of different types of workpieces by replacing a measuring head.
The utility model discloses an inside and outside diameter comparison measuring instrument, which is used for measuring the inside diameter or outside diameter size of a workpiece and comprises the following steps:
The base is provided with a hollow cavity, the plane of the bottom of the base is a first plane, and the front side plate of the base is provided with a second chute;
The first mounting frame and the second mounting frame are arranged side by side in the direction perpendicular to the first plane, a first measuring head capable of extending out of the first plane is arranged at the bottom of the first mounting frame, and a second measuring head capable of extending out of the bottom of the base is arranged at the bottom of the second mounting frame;
The first knob is arranged at the top of the first mounting frame, can control the locking or loosening state of the first mounting frame, and can drive the first measuring head to move along the direction approaching to or far from the second measuring head when the first knob controls the first mounting frame to be in the loosening state;
the second knob is embedded into the second chute and connected with the second mounting frame, and the second knob can drive the second measuring head to move along the length direction of the base;
The measuring instrument measures the inner diameter size of the workpiece when the second mounting frame moves away from the first mounting frame under elastic force in a relaxed state, and measures the outer diameter size of the workpiece when the second mounting frame moves close to the first mounting frame under elastic force in a relaxed state;
The measuring tool comprises a gauge head and a measuring rod capable of penetrating through the gauge head, one end of the measuring rod is connected with the gauge head, and the other end of the measuring rod penetrates through the base to be provided with a third measuring head capable of being in contact with the second mounting frame.
Further, the inner diameter and outer diameter comparison measuring instrument is characterized in that the first mounting frame and the second mounting frame are arranged in the base in parallel, a first sliding groove is formed in the top of the base, and the first knob is embedded into the first sliding groove.
Further, the inside and outside diameter comparison measuring instrument is characterized in that the first mounting frame is arranged in the base through the extension rod, the first knob is used for controlling the first mounting frame to be in a loosening state, the first knob can drive the first mounting frame to move in the length direction of the extension rod, and the bottoms of the first measuring head and the second measuring head are on the same plane.
Further, the inner diameter and outer diameter comparison measuring instrument comprises a vertical section perpendicular to the first plane direction and a horizontal section parallel to the first plane direction, wherein the horizontal section is connected with the guide rail of the inner wall of the upper surface of the base through the sliding block, so that the second mounting frame can move along the length direction of the base, and the elastic piece is mounted at the bottom of the horizontal section.
Further, the inner diameter and outer diameter comparison measuring instrument is characterized in that the inner cavity of the first mounting frame is provided with a first mounting seat which moves up and down along the height direction of the first mounting frame, the bottom end of the first mounting seat is detachably connected with the first side head, and an adjusting locking screw which can adjust the height of the first mounting seat is arranged in the first mounting frame.
Further, the inner diameter and outer diameter comparison measuring instrument is characterized in that the inner cavity of the vertical section of the second mounting frame is provided with a second mounting seat which moves up and down along the height direction of the second mounting frame, the bottom end of the second mounting seat is detachably connected with the second measuring head, and an adjusting locking screw which can adjust the height of the second mounting seat is arranged in the second mounting frame.
Further, the inner diameter and outer diameter comparing and measuring instrument is characterized in that the first measuring head and the second measuring head are spherical measuring heads, the first measuring head is coincident with the central axis of the first mounting seat, and the second measuring head is coincident with the central axis of the second mounting seat.
Further, the inner diameter and outer diameter comparing and measuring instrument is characterized in that an included angle between the first measuring head and the first mounting seat is 90 degrees, an included angle between the second measuring head and the second mounting seat is 90 degrees, and the distance between the central axes of the first measuring head and the second measuring head is larger than the distance between the central axes of the first mounting seat and the second mounting seat.
Further, the inner diameter and outer diameter comparing and measuring instrument is characterized in that the first measuring head and the second measuring head are conical measuring heads, the first measuring head is overlapped with the central axis of the first mounting seat, and the second measuring head is overlapped with the central axis of the second mounting seat.
Further, the inner diameter and outer diameter comparing and measuring instrument is characterized in that the first measuring head and the second measuring head are disc-shaped measuring heads, the first measuring head is coincident with the central axis of the first mounting seat, and the second measuring head is coincident with the central axis of the second mounting seat.
The technical scheme can be seen that the utility model has the following beneficial effects:
1. The internal and external diameter comparison measuring instrument can change different measuring heads to measure different sizes, expands application occasions, is convenient for measuring a plurality of different sizes, has higher measuring precision, accords with most measuring requirements, flexibly sets standard values, does not need specific standard ring gauges, greatly reduces production cost, rapidly measures working actual values, automatically locks measuring states and prevents operation errors, can select a measuring structure with an extension rod when a conventional measuring structure cannot meet a larger measuring range, and expands the measuring range of the measuring instrument;
2. the inner diameter and outer diameter comparison measuring instrument is characterized in that an elastic piece is arranged at the bottom of a second mounting frame, when the elastic piece is in a relaxed state, the second mounting frame moves away from the first mounting frame under elastic force, the measuring instrument measures the inner diameter dimension of a workpiece, when the elastic piece is in a relaxed state, the second mounting frame moves towards the direction close to the first mounting frame under elastic force, the measuring instrument measures the outer diameter dimension of the workpiece, and the inner diameter or the outer diameter dimension of the workpiece is measured.
The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an inside-outside diameter comparison measuring instrument in an embodiment of the utility model;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic diagram of an inside-outside diameter comparison measuring instrument according to another embodiment of the present utility model;
FIG. 4 is a schematic cross-sectional view of FIG. 3;
FIGS. 5 and 6 are schematic views of a first embodiment of the present utility model;
Fig. 7 and 8 are schematic views of a second embodiment of the present utility model;
Fig. 9 and 10 are schematic views of a third embodiment of the present utility model;
Fig. 11 and 12 are schematic views of a fourth embodiment of the present utility model;
Fig. 13 and 14 are schematic views showing installation of an elastic member for measuring the inner and outer diameter dimensions of a workpiece in accordance with an embodiment of the present utility model.
The reference numerals of the drawings comprise 1, a base, 2, a first mounting frame, 3, a second mounting frame, 4, a first measuring head, 5, a second measuring head, 6, a first knob, 7, a second knob, 8, a gauge head, 9, a measuring rod, 11, a third measuring head, 12, a first mounting seat, 13, a second mounting seat, 14, a guide rail, 15, a sliding block, 16, a first sliding groove, 17, a second sliding groove, 18, an extension rod, 19 and an elastic piece.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, in the description of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
The present utility model will be described in detail with reference to the accompanying drawings and examples.
Referring to fig. 1 to 14, the present embodiment provides an inside-outside diameter comparison gauge for measuring an inside diameter or an outside diameter dimension of a workpiece, comprising:
The base 1, the base 1 has a hollow cavity, the plane where the bottom of the base 1 is located is a first plane, and the front side plate of the base 1 is provided with a second chute 17;
The device comprises a first mounting frame 2 and a second mounting frame 3, wherein the first mounting frame 2 and the second mounting frame 3 are arranged side by side in the direction perpendicular to a first plane, a first measuring head 4 capable of extending out of the first plane is arranged at the bottom of the first mounting frame 2, and a second measuring head 5 capable of extending out of the bottom of the base 1 is arranged at the bottom of the second mounting frame 3;
The first knob 6 is arranged at the top of the first mounting frame 2, the first knob 6 can control the locking or loosening state of the first mounting frame 2, and when the first knob 6 controls the first mounting frame 2 to be in the loosening state, the first knob 6 can drive the first measuring head 4 to move along the direction approaching or separating from the second measuring head 5;
The second knob 7 is embedded in the second chute 17, the second knob 7 is connected with the second mounting frame 3, and the second knob 7 can drive the second measuring head 5 to move along the length direction of the base 1;
The elastic member 19 is disposed at the bottom of the second mounting frame 3, and referring to fig. 13, when the elastic member 19 is in a relaxed state, the second mounting frame 3 approaches to the left by elastic force (i.e., moves in a direction away from the first mounting frame), the first measuring head 4 and the second measuring head 5 are both in contact with the inner wall of the workpiece to be measured, and the measuring instrument measures the inner diameter dimension of the workpiece, and referring to fig. 14, when the elastic member 19 is in a relaxed state, the second mounting frame 3 approaches to the right by elastic force (i.e., moves in a direction close to the first mounting frame), the first measuring head 4 and the second measuring head 5 are both in contact with the outer wall of the workpiece to be measured, and the measuring instrument measures the outer diameter dimension of the workpiece, and the measuring principle is the same, except that the measuring principle is different in the inner force measuring directions. In this embodiment, the elastic member 19 may be selected from springs or other elastic products.
The measuring tool comprises a gauge head 8 and a measuring rod 9 capable of penetrating through the gauge head 8, one end of the measuring rod 9 is connected with the gauge head 8, and the other end of the measuring rod penetrates through the base 1 and is provided with a third measuring head 11 capable of being in contact with the second mounting frame 3. Specifically, in this embodiment, the measurement accuracy requirement is high, and the gauge may be a dial indicator.
Specifically, referring to fig. 1 and 2, in the present embodiment, the conventional measuring structure is that the first mounting frame 2 and the second mounting frame 3 are disposed in parallel in the base 1, a first chute 16 is disposed at the top of the base 1, and the first knob 6 is embedded in the first chute 16.
Specifically, referring to fig. 3 and 4, in another embodiment, the conventional measuring structure has a limited measuring range, and when a larger measuring range is required, the extended measuring structure is that the first mounting frame 2 is disposed in the base 1 through the extension rod 18, the first knob 6 controls the first mounting frame 2 to be in a loose state, the first knob 6 can drive the first mounting frame 2 to move along the length direction of the extension rod 18, and the bottoms of the first measuring head 4 and the second measuring head 5 are on the same plane. In this embodiment, the extension rod 18 can select a cylindrical structure, the length of the extension rod 18 can be adjusted according to actual measurement requirements, the measurement structure of the added and prolonged version is a split structure, the bottom measurement surfaces of the first mounting frame 2 and the base 1 can be calibrated by selecting parallel cushion blocks, the two measurement surfaces are guaranteed to be on the same plane, and the measurement accuracy is guaranteed.
Specifically, in this embodiment, the second mounting frame 3 includes a vertical section perpendicular to the first plane direction and a horizontal section parallel to the first plane direction, and the horizontal section is connected to the guide rail 14 on the inner wall of the upper surface of the base 1 through the slider 15, so that the second mounting frame 3 can move along the length direction of the base 1, and the elastic member 19 is mounted at the bottom of the horizontal section.
Specifically, in this embodiment, the inner cavity of the first mounting frame 2 is provided with a first mounting seat 12 that moves up and down along the height direction thereof, the bottom end of the first mounting seat 12 is detachably connected with the first side head, and an adjusting locking screw (not shown in the figure) that can adjust the height of the first mounting seat 12 is provided in the first mounting frame 2, so that the mounting height position of the first measuring head 4 can be adjusted to adapt to different measuring depths.
Specifically, in this embodiment, the inner cavity of the vertical section of the second mounting frame 3 is provided with a second mounting seat 13 that moves up and down along the height direction thereof, the bottom end of the second mounting seat 13 is detachably connected with the second measuring head 5, and an adjusting locking screw (not shown in the figure) that can adjust the height of the second mounting seat 13 is provided in the second mounting frame 3, so that the mounting height position of the second measuring head 5 can be adjusted to adapt to different measuring depths.
By means of the structure, the first measuring head 4 and the second measuring head 5 are made of stainless steel, the bottom of the base 1 is a smooth surface measuring surface, when the device is used, the smooth surface measuring surface is in contact with a measured workpiece, the first measuring head 4 and the second measuring head 5 are in contact with the inner wall or the outer wall of the measured workpiece, the gauge is initialized, a standard block is set according to the size range of the measured workpiece by adopting a comparison measuring method, the positions of the first measuring head 4 and the second measuring head 5 are adjusted, the data measured by the gauge head 8 are deviation values relative to the standard block, and as the numerical value of the standard block is known, the whole measured value is equal to the simple algebraic sum of the deviation value and the numerical value of the standard block, so that the whole measured value of the measured workpiece can be measured conveniently and rapidly by only calibrating the numerical value of the standard block; the inner and outer diameter comparison measuring instrument can change different measuring heads to measure different sizes, expands application occasions, is convenient for measuring various different sizes, has higher measuring precision, meets most measuring requirements, flexibly sets standard values, does not need specific standard ring gauges, greatly reduces production cost, rapidly measures actual working values, automatically locks a measuring state and prevents operation errors, can select a measuring structure with an extension rod to expand the measuring range of the measuring instrument when a conventional measuring structure cannot meet a larger measuring range, and is provided with an elastic piece 19 at the bottom of a second mounting frame 3, and when the elastic piece 19 is in a relaxed state, the second mounting frame 3 is contacted with the inner wall of a measured workpiece by elastic force, the measuring instrument measures the inner diameter size of the workpiece by the first measuring head 4 and the second measuring head 5, and is provided with an extension rod to expand the measuring range of the measuring instrument when the elastic piece 19 is in a relaxed state, according to fig. 13, when the second mounting frame 3 moves towards the direction close to the first mounting frame under elastic acting force, the first measuring head 4 and the second measuring head 5 are in contact with the outer wall of the measured workpiece, the measuring instrument measures the outer diameter size of the workpiece, the inner diameter or the outer diameter size of the workpiece is measured, the measuring principle is the same, and the difference is that the measuring force direction in the measuring instrument is different.
The utility model is illustrated in detail below by means of specific examples:
Example 1
Specifically, referring to fig. 5, in this embodiment, the first measuring head 4 and the second measuring head 5 are spherical measuring heads, the first measuring head 4 coincides with the central axis of the first mounting seat 12, and the second measuring head 5 coincides with the central axis of the second mounting seat 13.
Specifically, referring to fig. 6, when the required measurement range is enlarged, the extension rod is adopted to increase the measurement range, the first mounting frame can move on the extension rod to adjust the measurement range, but the measuring instrument with the extension rod structure is of a split structure, and the parallel cushion blocks can be selected to calibrate the measurement surfaces of the first mounting frame and the base before measurement, so that the measurement surfaces of the first mounting frame and the base are in the same plane, and the measurement accuracy is ensured.
Example two
Specifically, referring to fig. 7, in this embodiment, the included angle between the first measuring head 4 and the first mounting seat 12 is 90 °, the included angle between the second measuring head 5 and the second mounting seat 13 is 90 °, and the distance between the central axes of the first measuring head 4 and the second measuring head 5 is greater than the distance between the central axes of the first mounting seat 12 and the second mounting seat 13, so that the group of measuring heads can measure the inner hole groove.
Specifically, referring to fig. 8, when the required measurement range is enlarged, the extension rod is adopted to increase the measurement range, the first mounting frame can move on the extension rod to adjust the measurement range, but the measuring instrument with the extension rod structure is of a split structure, and the parallel cushion blocks can be selected to calibrate the measurement surfaces of the first mounting frame and the base before measurement, so that the measurement surfaces of the first mounting frame and the base are in the same plane, and the measurement accuracy is ensured.
Example III
Specifically, referring to fig. 9, in this embodiment, the first measuring head 4 and the second measuring head 5 are conical measuring heads, the central axes of the first measuring head 4 and the first mounting seat 12 coincide, the central axes of the second measuring head 5 and the second mounting seat 13 coincide, and the hole center distance of the workpiece can be measured by adopting a pair of conical measuring heads.
Specifically, referring to fig. 10, when the required measurement range is enlarged, the extension rod is adopted to increase the measurement range, the first mounting frame can move on the extension rod to adjust the measurement range, but the measuring instrument with the extension rod structure is of a split structure, and the parallel cushion blocks can be selected to calibrate the measurement surfaces of the first mounting frame and the base before measurement, so that the measurement surfaces of the first mounting frame and the base are in the same plane, and the measurement accuracy is ensured.
Example IV
Specifically, referring to fig. 11, in this embodiment, the first measuring head 4 and the second measuring head 5 are disc-shaped measuring heads, the first measuring head 4 coincides with the central axis of the first mounting seat 12, the second measuring head 5 coincides with the central axis of the second mounting seat 13, and the diameter of the groove in the hole can be measured by adopting a pair of disc-shaped measuring heads.
Specifically, referring to fig. 12, when the required measurement range is enlarged, the extension rod is adopted to increase the measurement range, the first mounting frame can move on the extension rod to adjust the measurement range, but the measuring instrument with the extension rod structure is of a split structure, and the parallel cushion blocks can be selected to calibrate the measurement surfaces of the first mounting frame and the base before measurement, so that the measurement surfaces of the first mounting frame and the base are in the same plane, and the measurement accuracy is ensured.
In the utility model, different measuring heads or extension bars can be replaced to measure different sizes, so that the application occasions are enlarged, the sizes of various different workpieces can be conveniently measured, the measurement accuracy is higher, and most of measurement requirements are met.
The principles and embodiments of the present utility model have been described in detail in the foregoing application examples, which are provided to facilitate understanding of the technical solutions and core ideas of the present utility model, and in addition, since modifications may be made by one skilled in the art in light of the present teachings, the present teachings should not be construed as limited to the above descriptions.
Claims (10)
1. An inside-outside diameter comparison gauge for measuring the inside or outside diameter dimension of a workpiece, comprising:
The base is provided with a hollow cavity, the plane of the bottom of the base is a first plane, and the front side plate of the base is provided with a second chute;
The first mounting frame and the second mounting frame are arranged side by side in the direction perpendicular to the first plane, a first measuring head capable of extending out of the first plane is arranged at the bottom of the first mounting frame, and a second measuring head capable of extending out of the bottom of the base is arranged at the bottom of the second mounting frame;
The first knob is arranged at the top of the first mounting frame, can control the locking or loosening state of the first mounting frame, and can drive the first measuring head to move along the direction approaching to or far from the second measuring head when the first knob controls the first mounting frame to be in the loosening state;
the second knob is embedded into the second chute and connected with the second mounting frame, and the second knob can drive the second measuring head to move along the length direction of the base;
The measuring instrument comprises a first mounting frame, a second mounting frame, an elastic piece, a measuring instrument, a first measuring head, a second measuring head, a first measuring head and a second measuring head, wherein the elastic piece is arranged at the bottom of the second mounting frame, when the elastic piece is in a relaxed state, the second mounting frame is contacted with the inner wall of a measured workpiece when being moved away from the first mounting frame under elastic force, and the measuring instrument measures the inner diameter of the workpiece;
The measuring tool comprises a gauge head and a measuring rod capable of penetrating through the gauge head, one end of the measuring rod is connected with the gauge head, and the other end of the measuring rod penetrates through the base to be provided with a third measuring head capable of being in contact with the second mounting frame.
2. The inside and outside diameter comparison measuring instrument according to claim 1, wherein the first mounting frame and the second mounting frame are arranged in the base in parallel, a first sliding groove is formed in the top of the base, and the first knob is embedded into the first sliding groove.
3. The inside and outside diameter comparison measuring instrument according to claim 1, wherein the first mounting frame is arranged in the base through an extension rod, the first knob controls the first mounting frame to be in a loose state, the first knob can drive the first mounting frame to move in the length direction of the extension rod, and the bottoms of the first measuring head and the second measuring head are on the same plane.
4. A inside and outside diameter comparison measuring instrument according to claim 2 or 3, wherein the second mounting frame comprises a vertical section arranged perpendicular to the first plane direction and a horizontal section parallel to the first plane direction, the horizontal section is connected with the guide rail of the inner wall of the upper surface of the base through a sliding block, so that the second mounting frame can move along the length direction of the base, and the elastic piece is mounted at the bottom of the horizontal section.
5. The inside and outside diameter comparison measuring instrument according to claim 4, wherein the inner cavity of the first mounting frame is provided with a first mounting seat which moves up and down along the height direction of the first mounting frame, the bottom end of the first mounting seat is detachably connected with the first side head, and an adjusting locking screw which can adjust the height of the first mounting seat is arranged in the first mounting frame.
6. The inside and outside diameter comparison measuring instrument according to claim 4, wherein the inner cavity of the vertical section of the second mounting frame is provided with a second mounting seat which moves up and down along the height direction of the second mounting frame, the bottom end of the second mounting seat is detachably connected with the second measuring head, and an adjusting locking screw which can adjust the height of the second mounting seat is arranged in the second mounting frame.
7. The inside and outside diameter comparison measuring instrument according to claim 6, wherein the first measuring head and the second measuring head are spherical measuring heads, the first measuring head coincides with a central axis of the first mounting seat, and the second measuring head coincides with a central axis of the second mounting seat.
8. The inside and outside diameter comparison measuring instrument according to claim 7, wherein an included angle between the first measuring head and the first mounting seat is 90 degrees, an included angle between the second measuring head and the second mounting seat is 90 degrees, and a distance between central axes of the first measuring head and the second measuring head is greater than a distance between central axes of the first mounting seat and the second mounting seat.
9. The inside and outside diameter comparison measuring instrument according to claim 6, wherein the first measuring head and the second measuring head are conical measuring heads, the first measuring head coincides with a central axis of the first mounting seat, and the second measuring head coincides with a central axis of the second mounting seat.
10. The inside and outside diameter comparison measuring instrument according to claim 6, wherein the first measuring head and the second measuring head are disc-shaped measuring heads, the first measuring head coincides with the central axis of the first mounting seat, and the second measuring head coincides with the central axis of the second mounting seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420817370.3U CN222188275U (en) | 2024-04-19 | 2024-04-19 | An inner and outer diameter comparison measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420817370.3U CN222188275U (en) | 2024-04-19 | 2024-04-19 | An inner and outer diameter comparison measuring instrument |
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| CN222188275U true CN222188275U (en) | 2024-12-17 |
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| CN202420817370.3U Active CN222188275U (en) | 2024-04-19 | 2024-04-19 | An inner and outer diameter comparison measuring instrument |
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