CN121068075B - Detection device and detection method based on three-jaw inside micrometer measuring force - Google Patents
Detection device and detection method based on three-jaw inside micrometer measuring forceInfo
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- CN121068075B CN121068075B CN202511588749.7A CN202511588749A CN121068075B CN 121068075 B CN121068075 B CN 121068075B CN 202511588749 A CN202511588749 A CN 202511588749A CN 121068075 B CN121068075 B CN 121068075B
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Abstract
The invention relates to the technical field of three-jaw inside micrometer measuring force detection, in particular to a detecting device and a detecting method based on three-jaw inside micrometer measuring force, wherein the detecting device based on three-jaw inside micrometer measuring force comprises a base, a movable clamp and a three-jaw chuck, the movable clamp and the three-jaw chuck are respectively arranged at two ends of the base, the movable clamp is used for clamping a three-jaw inside micrometer to be tested and can drive the three-jaw inside micrometer to move in the horizontal direction and the vertical direction, a digital display force transducer is correspondingly arranged on one side, opposite to the center of the three-jaw chuck, of the movable jaw of the three-jaw chuck, a measuring head of the digital display force transducer is positioned on a central line of the corresponding movable jaw, and the three digital display force transducers are in butt fit with three measuring jaws of the three-jaw inside micrometer in a one-to-one correspondence manner. The three-jaw internal micrometer has the advantages that the measuring error caused by the center displacement of the three-jaw internal micrometer can be reduced, and the measuring precision and the working efficiency are improved.
Description
Technical Field
The invention relates to the technical field of three-jaw inside micrometer measuring force detection, in particular to a three-jaw inside micrometer measuring force-based detection device and a three-jaw inside micrometer measuring force-based detection method.
Background
The measuring force requirement of the three-jaw inside micrometer is regulated in the related national standard of the existing three-jaw inside micrometer, and a measuring force checking method is provided, wherein as shown in figure 1, the checking of the measuring force is carried out by using a dynamometer 1 with an indexing value not more than 0.2N and an accuracy level of 2.5, and the three measuring jaws of the three-jaw inside micrometer 2 are simultaneously stressed by means of a 60-degree V-shaped block 3 (or a similar device) during the checking.
In the above inspection method, the three measuring claws are stressed simultaneously, because the V-shaped block 3 is fixed, when the three measuring claws extend, the center (axis) of the measuring head of the three-claw inside micrometer 2 can be displaced upwards, and then in the measuring process, the measuring error can be caused by the center displacement of the three-claw inside micrometer, the accuracy of the measuring result is difficult to ensure, and the three-claw inside micrometer is difficult to clamp under the condition that the three-claw inside micrometer moves upwards, so that the efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a detection device and a detection method based on three-jaw inside micrometer measuring force, which can reduce measuring errors caused by the center displacement of the three-jaw inside micrometer, thereby improving measuring precision and working efficiency.
The aim of the invention is achieved by the following technical scheme:
The detection method of the detection device based on the three-jaw inside micrometer measuring force comprises the steps of arranging a base, a movable clamp and a three-jaw chuck at two ends of the base respectively, clamping the three-jaw inside micrometer to be detected by the movable clamp and driving the three-jaw inside micrometer to move in the horizontal direction and the vertical direction, arranging a digital display force measuring sensor on one side, opposite to the center of the three-jaw chuck, of the movable jaw of the three-jaw chuck correspondingly, arranging a measuring head of the digital display force measuring sensor on a central line of the corresponding movable jaw, and enabling the three digital display force measuring sensors to be in butt fit with three measuring jaws of the three-jaw inside micrometer in a one-to-one correspondence manner.
The three-jaw inside micrometer measuring force detection method comprises the following detection steps:
S1, zeroing the digital display force transducer, adjusting the position of a movable jaw of the three-jaw chuck, and adjusting the position of the three-jaw inside micrometer through a movable clamp, so that three measuring jaws of the three-jaw inside micrometer are respectively contacted with measuring heads of the three digital display force transducer, and then fine-adjusting the position of the three-jaw inside micrometer through the movable clamp, so that the readings of the three digital display force transducers are the same.
S2, a force measuring device of the three-jaw inside micrometer is rotated, when the force measuring device sounds, the numerical values of the three digital display force measuring sensors are read, and the maximum value of the numerical values is taken as the measuring force of the three-jaw inside micrometer.
In step S1, when the measuring jaw of the three-jaw inside micrometer contacts with the measuring head of the digital measuring sensor, the movable jaw position of the three-jaw chuck is adjusted to enable the measuring jaw of the three-jaw inside micrometer to fall into the corresponding V-shaped positioning groove, then the three-jaw inside micrometer is clamped and fixed through the movable clamp, and then the movable clamp drives the three-jaw inside micrometer to move upwards to enable the measuring jaw of the three-jaw inside micrometer to move along the center line of the V-shaped positioning groove to contact with the measuring head of the digital measuring sensor.
In step S1, when the position of the three-jaw inside micrometer is finely adjusted, the horizontal position of the three-jaw inside micrometer is finely adjusted through the movable clamp, so that the readings of three digital display force transducers are approximately the same.
Further, the movable clamp comprises a horizontal moving assembly, a vertical moving assembly and a clamping assembly, wherein the horizontal moving assembly is arranged on the base, the vertical moving assembly is arranged on the horizontal moving assembly, and the clamping assembly is arranged on the vertical moving assembly and used for clamping the three-jaw inside micrometer.
Further, the horizontal movement assembly comprises a guide rail and a sliding seat, the guide rail is arranged on the base along the horizontal movement direction of the three-jaw inside micrometer, the bottom of the sliding seat is arranged on the guide rail in a sliding manner through the sliding block, and the vertical movement assembly is arranged on the sliding seat.
Further, the vertical moving assembly comprises a stand column and a supporting arm, the stand column is arranged on the sliding seat, one end of the supporting arm is slidably sleeved on the stand column, and the other end of the supporting arm is connected to the clamping assembly.
Further, the clamping assembly comprises a clamping frame, a top block and an adjusting bolt, one end of the clamping frame is fixedly connected to the supporting arm, a V-shaped clamping groove is formed in the inner side of one end, close to the supporting arm, of the clamping frame, the three-jaw inside micrometer penetrates through the clamping frame and is matched with the V-shaped clamping groove in a clamping mode, one end, far away from the supporting arm, of the clamping frame is connected with the adjusting bolt in a threaded mode, the rod portion of the adjusting bolt penetrates into the inner side of the clamping frame and is connected to the top block in a parallel mode, and the top block abuts against the three-jaw inside micrometer.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the invention, through the arrangement of the movable clamp, the three-jaw chuck and the digital display force sensor, in the process of detecting the measuring force of the three-jaw inside micrometer, the position of the three-jaw inside micrometer is regulated through the movable clamp, and the working principle of the three-jaw inside micrometer can be perfectly matched by combining the automatic centering characteristic of the three-jaw chuck during working, so that the three-jaw inside micrometer cannot move upwards due to the stress of the measuring jaw during detection, further the measuring error caused by the upward movement of the center of the three-jaw inside micrometer can be reduced, meanwhile, the data reading is convenient by combining the digital display force sensor, the error caused by the traditional visual reading is reduced, and the detection precision is further improved.
2. According to the invention, through the arrangement of the positioning blocks and the V-shaped positioning grooves, the three-jaw inner micrometer can be matched with the movable clamp in the process of measuring force detection of the three-jaw inner micrometer, so that the three-jaw inner micrometer can be rapidly and accurately clamped and positioned, and the working efficiency is improved.
3. The invention is suitable for measuring force detection of three-jaw inside micrometer with different specifications, has low detection operation difficulty and short measurement time, can provide convenience for production enterprises and metering detection mechanisms, and has good application and popularization values.
Drawings
FIG. 1 is a schematic illustration of a prior art three-jaw inside micrometer measuring force test;
FIG. 2 is a perspective view of the whole structure of the present invention;
FIG. 3 is a schematic elevational view of the overall structure of the present invention;
FIG. 4 is a schematic top view of the overall structure of the present invention;
FIG. 5 is a schematic cross-sectional view of the structure of FIG. 3 in the direction A-A;
FIG. 6 is a schematic diagram of a digital display load cell in accordance with the present invention.
In the figure, 1, a dynamometer, 2, a three-jaw inside micrometer, 3, a V-shaped block, 4, a base, 5, a three-jaw chuck, 6, a movable jaw, 7, a digital display force sensor, 8, a measuring head, 9, a guide rail, 10, a sliding seat, 11, a column, 12, a support arm, 13, a clamping frame, 14, a top block, 15, an adjusting bolt, 16, a V-shaped clamping groove, 17, a positioning block, 18, a V-shaped positioning groove, 19, a sliding block, 20, a spanner, 21, a jacking bolt, 22 and a locking bolt are shown.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 2 to 6, a detecting device based on a three-jaw inside micrometer measuring force comprises a base 4, a movable clamp and a three-jaw chuck 5. The three-jaw internal micrometer comprises a base 4, a movable clamp and a three-jaw chuck 5, wherein the movable clamp and the three-jaw chuck 5 are respectively arranged at two ends of the base 4, the movable clamp is used for clamping a three-jaw internal micrometer 2 to be tested, the movable clamp can drive the three-jaw internal micrometer 2 to move in the horizontal direction and the vertical direction so as to adjust the position of the three-jaw internal micrometer 2, a digital display force transducer 7 is correspondingly arranged on one side, opposite to the center of the three-jaw chuck 5, of three movable jaws 6 of the three-jaw chuck 5, a measuring head 8 of the digital display force transducer 7 is positioned on a central line of the corresponding movable jaw 6, and the three digital display force transducers 7 are in one-to-one butt fit with three measuring jaws of the three-jaw internal micrometer 2.
As shown in fig. 2 to 4, the movable clamp includes a horizontal moving assembly, a vertical moving assembly, and a clamping assembly, the horizontal moving assembly is mounted on the base 4, the vertical moving assembly is mounted on the horizontal moving assembly, and the clamping assembly is mounted on the vertical moving assembly. The horizontal moving assembly comprises a guide rail 9 and a sliding seat 10, the guide rail 9 is fixed on the base 4 along the horizontal moving direction of the three-jaw inside micrometer 2, the bottom of the sliding seat 10 is slidably mounted on the guide rail 9 through a sliding block 19, the vertical moving assembly comprises a stand column 11 and a supporting arm 12, the stand column 11 is fixed on the sliding seat 10, one end of the supporting arm 12 is slidably sleeved on the stand column 11, and the other end of the supporting arm 12 is connected with the clamping assembly. The clamping assembly is used for clamping the three-jaw inside micrometer 2, after the three-jaw inside micrometer 2 is clamped and fixed, the three-jaw inside micrometer 2 is driven to move in the horizontal direction through the sliding of the sliding seat 10 on the guide rail 9, and the three-jaw inside micrometer 2 is driven to move in the vertical direction through the sliding of the supporting arm 12 on the upright post 11, so that the position of the three-jaw inside micrometer 2 is adjusted.
As shown in fig. 2 and 3, an upright tightening bolt 21 is screwed on the slide 10, a wrench 20 is fixed at the top of the tightening bolt 21, the lower end of the tightening bolt 21 passes through the slide 10 and is fixedly connected with a rubber press block, after the slide 10 slides in place, the tightening bolt 21 is driven to move downwards by pulling the wrench 20, so that the rubber press block is tightly abutted against the base 4, and the slide 10 is further fixed.
As shown in fig. 2-4, an opening is formed in one end of the support arm 12, which is slidably connected with the upright post 11, along the length direction of the support arm 12, a locking bolt 22 is in threaded connection with one side of the support arm 12 at the opening, the locking bolt 22 penetrates through the opening, after the support arm 12 is slid in place, the parts of the support arm 12 at the two sides of the opening are closed by tightening the locking bolt 22, and then the support arm 12 tightly clamps the upright post 11, so that the support arm 12 is fixed.
As shown in fig. 2 and 4, the clamping assembly includes a clamping frame 13, a top block 14, and an adjusting bolt 15. One end of the clamping frame 13 is fixedly connected with the supporting arm 12, a V-shaped clamping groove 16 is formed in the inner side of one end, close to the supporting arm 12, of the clamping frame 13, an adjusting bolt 15 is connected to one end, far away from the supporting arm 12, of the clamping frame 13 in a threaded mode, and the rod portion of the adjusting bolt 15 penetrates into the inner side of the clamping frame 13 and is fixedly connected with the jacking block 14. Through the sliding slide seat 10 and the supporting arm 12, the three-jaw inside micrometer 2 passes through the clamping frame 13 and is in clamping fit with the V-shaped clamping groove 16, then the adjusting bolt 15 is screwed to drive the top block 14 to tightly prop against the three-jaw inside micrometer 2, and the three-jaw inside micrometer 2 is clamped and fixed between the top block 14 and the V-shaped clamping groove 16.
As shown in fig. 2 and 4, the fixing manner between the support arm 12 and the clamping frame 13 is the same as the fixing manner of the support arm 12 on the upright 11. Specifically, one end of the supporting arm 12 is clamped on the clamping frame 13, an opening is formed in the side wall of one end, clamped by the clamping frame 13, of the supporting arm 12, a locking bolt 22 penetrating through the opening is connected to the top of the supporting arm 12 in a threaded mode, the locking bolt 22 is screwed to enable the positions, located on two sides of the opening, of the supporting arm 12 to be closed, and then the supporting arm 12 is enabled to tightly clamp the clamping frame 13, and accordingly the clamping frame 13 is fixed.
When the detection device is used for detecting the measuring force of the three-jaw inside micrometer 2, the detection method comprises the following detection steps:
S1, zeroing a digital display force transducer 7, adjusting the position of a movable claw 6 of a three-claw chuck 5, adjusting the position of a three-claw inside micrometer 2 through a movable clamp, enabling three measuring claws of the three-claw inside micrometer 2 to be respectively contacted with measuring heads 8 of the three digital display force transducer 7, and fine-adjusting the position of the three-claw inside micrometer 2 through the movable clamp to enable the readings of the three digital display force transducers 7 to be the same;
s2, a force measuring device of the three-jaw inside micrometer 2 rotates, when the force measuring device sounds, the numerical values of the three digital display force measuring sensors 7 are read, and the maximum value of the numerical values is taken as the measuring force of the three-jaw inside micrometer 2.
As shown in fig. 4 and 6, in order to facilitate quick and accurate positioning of the three-jaw inside micrometer 2, a positioning block 17 is fixed under the measuring head 8 on the digital display force transducer 7, a V-shaped positioning groove 18 is arranged on one side of the positioning block 17 opposite to the center of the three-jaw chuck 5 along the vertical direction, and the center line of the V-shaped positioning groove 18 is collinear with the center of the measuring head 8 of the digital display force transducer 7. Because the included angles between every two of the three movable claws 6 of the three-claw chuck 5 are 120 degrees, the included angles between every two of the three V-shaped positioning grooves 18 are 120 degrees, so that in the step S1, when the measuring claw of the three-claw inside micrometer 2 is contacted with the measuring head 8 of the digital display measuring sensor 7, the position of the movable claw 6 of the three-claw chuck 5 can be adjusted, the measuring claw of the three-claw inside micrometer 2 firstly falls into the corresponding V-shaped positioning groove 18, then the three-claw inside micrometer 2 is clamped and fixed through the movable clamp, and then the movable clamp drives the three-claw inside micrometer 2 to move upwards, so that the measuring claw of the three-claw inside micrometer 2 moves to be contacted with the measuring head 8 of the digital display measuring sensor 7 along the central line of the V-shaped positioning groove 18, and further the three-claw inside micrometer 2 is rapidly positioned. In addition, because three movable claws 6 move radially simultaneously and realize automatic centering when three-jaw chuck 5 works, the working principle of three-jaw inside micrometer 2 can be perfectly matched, and then when the measuring claw of three-jaw inside micrometer 2 detects the atress, three-jaw inside micrometer 2 can not move upwards, and simultaneously the problem that clamping is difficult under the condition that three-jaw inside micrometer 2 moves upwards in the measuring process can be solved, and simultaneously the stroke of movable claws 6 of three-jaw chuck 5 is adjustable, and then can be applicable to the three-jaw inside micrometer 2 of different specifications and measure.
As shown in fig. 5, in order to perform fine adjustment on the position of the three-jaw inside micrometer 2, the operation is more convenient and quicker, when the movable clamp and the three-jaw chuck 5 are installed, the horizontal movement track of the center of the three-jaw inside micrometer 2 is collinear with the movement track of one movable jaw 6 of the three-jaw chuck 5, so that in step S1, not only three-jaw inside micrometer 2 with various specifications can be rapidly clamped, but also the horizontal position of the three-jaw inside micrometer 2 only needs to be fine-adjusted through the movable clamp, and the readings of three digital display load cells 7 can be approximately the same.
According to the detection device and the corresponding detection method based on the three-jaw inside micrometer measuring force, in the process of detecting the three-jaw inside micrometer 2 measuring force, the three-jaw inside micrometer 2 can be rapidly and accurately clamped and positioned, the three-jaw inside micrometer 2 cannot move upwards due to the fact that the measuring jaws are stressed in detection, and therefore measuring errors caused by the fact that the centers of the three-jaw inside micrometer 2 move upwards can be reduced, meanwhile, data reading is facilitated by combining the digital display force measuring sensor 7, errors caused by traditional visual measurement readings are reduced, and detection accuracy is further improved. The invention can not only greatly shorten the measurement time and lighten the operation difficulty of operators, but also bring convenience to production enterprises and metering detection mechanisms, and has good application and popularization values.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The detection method of the detection device based on the three-jaw inside micrometer measuring force is characterized in that the detection device based on the three-jaw inside micrometer measuring force comprises a base (4), a movable clamp and a three-jaw chuck (5), wherein the movable clamp and the three-jaw chuck (5) are respectively arranged at two ends of the base (4), the movable clamp is used for clamping a three-jaw inside micrometer (2) to be measured and can drive the three-jaw inside micrometer (2) to move in the horizontal direction and the vertical direction, a digital display force transducer (7) is correspondingly arranged on one side, opposite to the center of the three-jaw chuck (5), of a movable jaw (6) of the three-jaw chuck (5), a measuring head (8) of the digital display force transducer (7) is positioned on a central line of the corresponding movable jaw (6), and the three digital display force transducers (7) are in one-to-one abutting fit with three measuring jaws of the three-jaw inside micrometer (2);
the method for detecting the measuring force of the three-jaw inside micrometer (2) comprises the following detection steps:
S1, zeroing a digital display force transducer (7), adjusting the position of a movable jaw (6) of a three-jaw chuck (5), adjusting the position of a three-jaw inside micrometer (2) through a movable clamp, enabling three measuring jaws of the three-jaw inside micrometer (2) to be respectively contacted with measuring heads (8) of the three digital display force transducer (7), and fine-adjusting the position of the three-jaw inside micrometer (2) through the movable clamp to enable the readings of the three digital display force transducers (7) to be the same;
s2, a force measuring device of the three-jaw inside micrometer (2) is rotated, when the force measuring device sounds, the numerical values of the three digital display force measuring sensors (7) are read, and the maximum value of the numerical values is taken as the measuring force of the three-jaw inside micrometer (2).
2. The detection method of the detection device based on the three-jaw inner micrometer measuring force according to claim 1, wherein a positioning block (17) is arranged right below a measuring head (8) on the digital display measuring sensor (7), a V-shaped positioning groove (18) is formed in one side, opposite to the center of the three-jaw chuck (5), of the positioning block (17) in the vertical direction, the center line of the V-shaped positioning groove (18) is collinear with the center of the measuring head (8) of the digital display measuring sensor (7), when the measuring jaw of the three-jaw inner micrometer (2) is in contact with the measuring head (8) of the digital display measuring sensor (7) in step S1, the position of a movable jaw (6) of the three-jaw chuck (5) is adjusted, the measuring jaw of the three-jaw inner micrometer (2) falls into a corresponding V-shaped positioning groove (18), then the three-jaw inner micrometer (2) is clamped and fixed through a movable clamp, and then the measuring jaw of the three-jaw inner micrometer (2) is driven to move upwards through the movable clamp, so that the measuring jaw of the three-jaw inner micrometer (2) moves along the V-shaped positioning groove (18) to be in contact with the center line of the measuring head (8) of the digital display measuring sensor (7).
3. The detection method of the detection device based on the three-jaw inside micrometer measuring force, which is disclosed by the claim 1, is characterized in that the horizontal movement track of the center of the three-jaw inside micrometer (2) is collinear with the movement track of one movable jaw (6) of the three-jaw chuck (5), and in step S1, when the position of the three-jaw inside micrometer (2) is finely adjusted, the horizontal position of the three-jaw inside micrometer (2) is finely adjusted through the movable clamp, so that the readings of three digital display load cells (7) are approximately the same.
4. The detection method of the detection device based on the three-jaw inside micrometer measuring force according to claim 1, wherein the movable clamp comprises a horizontal moving assembly, a vertical moving assembly and a clamping assembly, the horizontal moving assembly is arranged on the base (4), the vertical moving assembly is arranged on the horizontal moving assembly, and the clamping assembly is arranged on the vertical moving assembly and is used for clamping the three-jaw inside micrometer (2).
5. The detection method of the detection device based on the three-jaw inside micrometer measuring force according to claim 4, wherein the horizontal movement assembly comprises a guide rail (9) and a sliding seat (10), the guide rail (9) is arranged on the base (4) along the horizontal movement direction of the three-jaw inside micrometer (2), the bottom of the sliding seat (10) is arranged on the guide rail (9) in a sliding manner through a sliding block (19), and the vertical movement assembly is arranged on the sliding seat (10).
6. The detection method of the detection device based on the three-jaw inside micrometer measuring force according to claim 5, wherein the vertical moving assembly comprises a stand column (11) and a supporting arm (12), the stand column (11) is arranged on the sliding seat (10), one end of the supporting arm (12) is slidably sleeved on the stand column (11), and the other end of the supporting arm (12) is connected with the clamping assembly.
7. The detection method of the detection device based on the three-jaw inside micrometer measuring force according to claim 6, wherein the clamping assembly comprises a clamping frame (13), a jacking block (14) and an adjusting bolt (15), one end of the clamping frame (13) is fixedly connected with the supporting arm (12), a V-shaped clamping groove (16) is formed in the inner side of one end, close to the supporting arm (12), of the clamping frame (13), the three-jaw inside micrometer (2) penetrates through the clamping frame (13) and is in clamping fit with the V-shaped clamping groove (16), the adjusting bolt (15) is connected to one end, far away from the supporting arm (12), of the clamping frame (13) in a threaded mode, a rod portion of the adjusting bolt (15) penetrates into the inner side of the clamping frame (13) and is connected with the jacking block (14) in a parallel, and the jacking block (14) abuts against the three-jaw inside micrometer (2).
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| CN202511588749.7A CN121068075B (en) | 2025-11-03 | 2025-11-03 | Detection device and detection method based on three-jaw inside micrometer measuring force |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110470198A (en) * | 2019-08-30 | 2019-11-19 | 联动天翼新能源有限公司 | A kind of cylindrical battery case diameter and concentricity testing device |
| CN110763110A (en) * | 2019-11-18 | 2020-02-07 | 陕西航空电气有限责任公司 | Three-jaw internal diameter ruler automatic calibration device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2334962C2 (en) * | 1973-07-10 | 1975-06-26 | Maschinenfabrik Augsburg-Nuernberg Ag, 8000 Muenchen | Device for the exact determination of the inner diameter |
| CN87215869U (en) * | 1987-11-28 | 1988-08-31 | 吴家昌 | Digital display type applied force determination apparatus for measuring instruments |
| IT250569Y1 (en) * | 2000-10-02 | 2003-09-24 | Ruggeri Alberto | RESET TOOL FOR THREE-POINT MICROMETERS AND TWO-POINT BORE GAUGES |
| CN211205242U (en) * | 2020-02-18 | 2020-08-07 | 成都新成量工具有限公司 | Detection apparatus for circularity and tapering |
| CN114413704B (en) * | 2021-12-31 | 2023-06-02 | 西安航天计量测试研究所 | Three-point inside micrometer calibration device and calibration method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470198A (en) * | 2019-08-30 | 2019-11-19 | 联动天翼新能源有限公司 | A kind of cylindrical battery case diameter and concentricity testing device |
| CN110763110A (en) * | 2019-11-18 | 2020-02-07 | 陕西航空电气有限责任公司 | Three-jaw internal diameter ruler automatic calibration device |
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