CN107328331B - Distributed steel ruler calibrating device and method based on vision - Google Patents
Distributed steel ruler calibrating device and method based on vision Download PDFInfo
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- CN107328331B CN107328331B CN201710739735.XA CN201710739735A CN107328331B CN 107328331 B CN107328331 B CN 107328331B CN 201710739735 A CN201710739735 A CN 201710739735A CN 107328331 B CN107328331 B CN 107328331B
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- ruler
- steel ruler
- metal line
- standard metal
- calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/042—Calibration or calibration artifacts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/02—Rulers with scales or marks for direct reading
- G01B3/04—Rulers with scales or marks for direct reading rigid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention discloses a visual-based distributed steel ruler calibrating device and a visual-based distributed steel ruler calibrating method, wherein the visual-based distributed steel ruler calibrating device comprises a cuboid calibrating platform made of marble, a supporting frame is arranged at the bottom of the calibrating platform, three-standard metal line rulers which are arranged along the left-right direction are fixed on the calibrating platform, the front edges of the three-standard metal line rulers are aligned with the front edges of the calibrating platform, sliding rails which are arranged along the left-right direction are fixed on the calibrating platform at the rear side of the three-standard metal line rulers, a plurality of sliding blocks are connected onto the sliding rails in a sliding manner, supporting arms are uniformly arranged on the sliding blocks, cameras for shooting scale marks of the three-standard metal line rulers are fixed on the supporting arms, two-dimensional adjusting tables which can be adjusted along the horizontal and vertical directions are fixed on the front side surfaces of the calibrating platform, and a flat ruler for placing the steel ruler is fixed on the two-dimensional adjusting tables; the semi-automatic quick verification method is particularly suitable for semi-automatic quick verification of batch steel straightedges, greatly improves verification efficiency and reduces working intensity.
Description
Technical Field
The invention belongs to the technical field of metrological verification of steel straightedges, and particularly relates to a distributed steel straightedge verification device and method based on vision.
Background
The current verification method for the steel ruler is based on the Abbe principle in geometric measurement, and during verification, the method of manual adjustment is adopted to adjust the detected steel ruler, so that the line on the detected steel ruler and the line on the standard line ruler are read on the same straight line, and Abbe error caused by the parallel side of the line on the detected ruler and the ruler side of the standard ruler is adjusted in the manual adjustment method; meanwhile, errors caused by adverse factors such as friction force and human body temperature influence on the steel ruler are increased, so that the indication error of the detected steel ruler is increased; on the other hand, the zero end of the detected steel ruler is aligned with the zero end line of the three-standard metal line ruler or any large-size line, and the low-head single-eye observation is carried out by means of the eye force of a magnifying glass of a person, so that the indication error is larger, and the working strength is high.
Disclosure of Invention
The purpose of the invention is to provide a distributed steel ruler calibrating device based on vision and a method thereof, so as to solve the problems in the prior art, and the technical scheme adopted for achieving the purpose is as follows:
the visual distributed steel ruler calibrating device comprises a calibrating platform which is made of marble and is in a cuboid shape, a supporting frame is arranged at the bottom of the calibrating platform, three-class standard metal line rulers which are arranged along the left-right direction are fixed on the calibrating platform, the front edges of the three-class standard metal line rulers are aligned with the front edges of the calibrating platform, sliding rails which are arranged along the left-right direction are fixed on the calibrating platform at the rear side of the three-class standard metal line rulers, a plurality of sliding blocks are connected onto the sliding rails in a sliding manner, supporting arms are uniformly arranged on the sliding blocks, cameras for shooting scale marks of the three-class standard metal line rulers are fixed on the supporting arms, two-dimensional adjusting tables which can be adjusted along the horizontal direction and the vertical direction are fixed on the front side surfaces of the calibrating platform, and flat rulers for placing the steel ruler are fixed on the front side surfaces of the calibrating platform at the left side and the right side of the two-dimensional adjusting tables; an image monitor is placed on the verification platform, and the signal input end of the image monitor is connected with the signal output end of the camera.
Preferably, an adjustable pressing plate for fixing the three standard metal line ruler is arranged on the verification platform; an elastic pressing sheet for clamping and fixing the steel ruler is arranged on the flat ruler; the left end or the right end of the flat ruler is provided with a zero positioning block for fixing the end part of the steel ruler.
Preferably, the two-dimensional adjusting table is a two-dimensional adjusting table with a differential head.
A steel ruler verification method using the vision-based distributed steel ruler verification device, comprising the following steps of:
a: the steel ruler to be detected is horizontally placed on the flat ruler, the head end or the tail end of the steel ruler is propped against the zero position positioning block, and then the steel ruler is fixed by an elastic pressing sheet;
b: rotating a vertical differentiating head of the two-dimensional adjusting table, and adjusting the leveling ruler and the steel ruler in the up-down direction to enable the scale mark surface of the steel ruler and the ruler edge of the three-class standard metal line ruler to be on the same plane;
c: rotating the horizontal differentiating head of the two-dimensional adjusting table, and adjusting the leveling ruler and the steel ruler in the left-right direction to align zero scale marks of the steel ruler with zero scale marks of the three-class standard metal line ruler;
d: sliding the sliding block left and right to enable different cameras to be aligned with positions of corresponding scale marks required to be detected, screwing a fastening bolt on the sliding block, opening an image monitor, and rotating a coarse adjusting knob and a fine adjusting knob on the supporting arm to obtain clear images;
e: the image monitor carries out scale value line identification on the amplified contrast images of the three-standard metal line ruler and the steel ruler through image processing software, and finally, the indication error of the steel ruler is automatically calculated;
f: and after verification is finished, rotating the vertical differential head of the two-dimensional adjusting table, dropping the flat ruler so as to be placed on the support, and taking down the steel straight ruler.
Preferably, when the three-standard metal line ruler is required to be checked, the adjustable pressing plate is opened, and then the three-standard metal line ruler is taken out for checking.
The invention has the beneficial effects that: (1) The verification platform and the special leveling rule made of marble are used, so that the consistency requirement of the placement level of the three standard metal line ruler and the steel ruler is improved; (2) Through the arrangement of the two-dimensional adjusting table capable of being adjusted along the horizontal direction and the vertical direction, the alignment of the scale mark surface and the zero scale mark of the steel ruler and the three-standard metal line ruler is ensured, and under the matched use of the zero positioning block, errors caused by the contact of a hand or a hand with the steel ruler are avoided, and the alignment precision and accuracy are improved; (3) The cameras can be fixed at any position on the slide rail, so that the calibration positions of different scale marks of the steel ruler with different length specifications can be calibrated simultaneously according to the calibration requirements, and the problem of larger indication error caused by visual observation is avoided; (4) The elastic pressing sheet clamps and fixes the steel ruler, so that the requirement of coplanarity of the full range of the ruler to be inspected and the scale mark surface of the three-line ruler is improved; (5) The semi-automatic quick verification method is particularly suitable for semi-automatic quick verification of batch steel straightedges, greatly improves verification efficiency and reduces working intensity.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a left side view of fig. 1.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the visual distributed steel ruler calibrating device comprises a calibrating platform 8 which is made of marble and is in a cuboid shape, wherein a supporting frame 6 is arranged at the bottom of the calibrating platform 8, in order to realize levelness adjustment of the calibrating platform 8, a balance support leg is arranged at the bottom of one end of the supporting frame 6, two balance support legs are arranged at the bottom of the other end of the supporting frame 6, and levelness adjustment of the calibrating platform 8 can be realized rapidly through height adjustment of three balance support legs; a third-class standard metal line ruler 13 arranged along the left-right direction is fixed on the verification platform 8, the front edge of the third-class standard metal line ruler 13 is aligned with the front edge of the verification platform 8, a sliding rail 4 arranged along the left-right direction is fixed on the verification platform 8 at the rear side of the third-class standard metal line ruler 13, a plurality of sliding blocks 3 are connected on the sliding rail 4 in a sliding manner, in order to fix the sliding blocks 3 at any position of the sliding rail 4 for verification measurement at different scale positions, fastening bolts (not shown in the figure) are arranged on the sliding blocks 3, a supporting arm 2 is uniformly arranged on the sliding blocks 3, a camera 1 for shooting the scale marks of the third-class standard metal line ruler 13 is fixed on the supporting arm 2, a coarse adjusting knob and a fine adjusting knob are arranged on the supporting arm 2 for focusing the camera 1, a two-dimensional adjusting table 9 which can be adjusted along the horizontal and vertical directions is fixed on the front side surface of the verification platform 8, a flat ruler 12 for placing a steel ruler is fixed on the two-dimensional adjusting table 9, and a support 7 is fixed on the front side surface of the verification platform 8 at the left and right sides of the two-dimensional adjusting table 9; an image monitor 5 is placed on the verification platform 8, and a signal input end of the image monitor 5 is connected with a signal output end of the camera 1.
In order to facilitate verification of the third-class standard metal line ruler 13 to ensure the magnitude transmission of a higher level, an adjustable pressing plate (not shown in the figure) for fixing the third-class standard metal line ruler 13 is arranged on the verification platform 8, and the adjustable pressing plate has various forms, for example, two fixing bolts are arranged on an adjustable pressing plate body, the adjustable pressing plate body is pressed on the end part of the third-class standard metal line ruler 13, and then the third-class standard metal line ruler 13 is pressed on the verification platform 8 through the fixing bolts, so that the third-class standard metal line ruler 13 is convenient to quickly position and take out; an elastic pressing sheet (not shown in the figure) for clamping and fixing the steel ruler 14 is arranged on the flat ruler 12; a zero positioning block 15 for fixing the end part of the steel ruler 14 is arranged at the left end or the right end of the flat ruler 12.
In the process of aligning and adjusting the steel ruler 14 and the three-class standard metal line ruler 13, in order to improve the adjustment precision, the two-dimensional adjustment table 9 is a two-dimensional adjustment table with differential heads, and comprises a horizontal differential head 11 for adjusting in the horizontal direction and a vertical differential head 10 for adjusting in the vertical direction, wherein the structures of the horizontal differential head 11 and the vertical differential head 10 are micrometer principle structures.
A steel ruler verification method using the vision-based distributed steel ruler verification device described above, comprising the steps of:
a: the steel ruler 14 to be verified is horizontally placed on the flat ruler 12, the head end or the tail end of the steel ruler 14 is propped against the zero position positioning block 15, and then the steel ruler is fixed by an elastic pressing sheet;
b: the vertical differentiating head 10 of the two-dimensional adjusting table is rotated to adjust the leveling ruler 12 and the steel ruler 14 in the up-down direction, so that the scale mark surface of the steel ruler 14 and the edges of the three standard metal line rulers 13 are on the same plane;
c: rotating the horizontal differentiating head 11 of the two-dimensional adjusting table to adjust the horizontal rule 12 and the steel ruler 14 in the left-right direction, so that zero scale marks of the steel ruler 14 are aligned with zero scale marks of the three-standard metal line ruler 13;
d: sliding the sliding block 3 left and right to enable different cameras 1 to be aligned with positions of corresponding scale marks required to be verified, screwing fastening bolts on the sliding block, opening the image monitor 5, and rotating a coarse adjusting knob and a fine adjusting knob on the supporting arm 2 to obtain clear images;
e: the image monitor 5 carries out scale value line identification on the amplified contrast images of the three-standard metal line ruler 13 and the steel ruler 14 through image processing software, the vertical differential head 10 and/or the horizontal differential head 11 are/is rotated by reference to the scale value images for fine adjustment, the adjustment is carried out to a proper position, and finally the indication error of the steel ruler 14 is automatically calculated after photographing;
f: after verification, the vertical differential head 10 of the two-dimensional adjusting table is rotated, the flat ruler 12 is dropped to be placed on the support 7, and the steel straight ruler 14 is taken down.
When the three-standard metal line ruler 13 is required to be checked, the adjustable pressing plate is opened, and then the three-standard metal line ruler 13 is taken out for checking.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. A steel ruler verification method using a vision-based distributed steel ruler verification device, comprising the steps of:
a: the steel ruler to be detected is horizontally placed on the flat ruler, the head end or the tail end of the steel ruler is propped against the zero position positioning block, and then the steel ruler is fixed by an elastic pressing sheet;
b: rotating a vertical differentiating head of the two-dimensional adjusting table, and adjusting the leveling ruler and the steel ruler in the up-down direction to enable the scale mark surface of the steel ruler and the ruler edge of the three-class standard metal line ruler to be on the same plane;
c: rotating the horizontal differentiating head of the two-dimensional adjusting table, and adjusting the leveling ruler and the steel ruler in the left-right direction to align zero scale marks of the steel ruler with zero scale marks of the three-class standard metal line ruler;
d: sliding the sliding block left and right to enable different cameras to be aligned with positions of corresponding scale marks required to be detected, screwing a fastening bolt on the sliding block, opening an image monitor, and rotating a coarse adjusting knob and a fine adjusting knob on the supporting arm to obtain clear images;
e: the image monitor carries out scale value line identification on the amplified contrast images of the three-standard metal line ruler and the steel ruler through image processing software, and finally, the indication error of the steel ruler is automatically calculated;
f: after verification is finished, rotating the vertical differential head of the two-dimensional adjusting table, dropping the flat ruler so as to be placed on the support, and taking down the steel straight ruler;
the used vision-based distributed steel ruler calibrating device comprises a cuboid calibrating platform made of marble, wherein a support frame is arranged at the bottom of the calibrating platform, three-standard metal line rulers which are arranged along the left-right direction are fixed on the calibrating platform, the front edges of the three-standard metal line rulers are aligned with the front edges of the calibrating platform, sliding rails which are arranged along the left-right direction are fixed on the calibrating platform at the rear side of the three-standard metal line rulers, a plurality of sliding blocks are connected onto the sliding rails in a sliding manner, a supporting arm is uniformly arranged on the sliding blocks, a camera for shooting the graduation marks of the three-standard metal line rulers is fixed on the supporting arm, a two-dimensional adjusting table which can be adjusted along the horizontal direction and the vertical direction is fixed on the front side of the calibrating platform, and a support for supporting the steel ruler is fixed on the front side of the platform at the left side and the right side of the two-dimensional adjusting table; an image monitor is arranged on the verification platform, and the signal input end of the image monitor is connected with the signal output end of the camera;
an adjustable pressing plate for fixing the three standard metal line ruler is arranged on the verification platform; an elastic pressing sheet for clamping and fixing the steel ruler is arranged on the flat ruler; the left end or the right end of the flat ruler is provided with a zero positioning block for fixing the end part of the steel ruler; the two-dimensional adjusting table is a two-dimensional adjusting table with a differential head.
2. A method for testing a steel ruler according to claim 1, wherein when the three standard metal line rulers are required to be tested, the three standard metal line rulers are taken out for test after the adjustable pressing plate is opened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710739735.XA CN107328331B (en) | 2017-08-25 | 2017-08-25 | Distributed steel ruler calibrating device and method based on vision |
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| CN201710739735.XA CN107328331B (en) | 2017-08-25 | 2017-08-25 | Distributed steel ruler calibrating device and method based on vision |
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| CN107328331A CN107328331A (en) | 2017-11-07 |
| CN107328331B true CN107328331B (en) | 2023-05-23 |
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| CN112113477A (en) * | 2020-10-23 | 2020-12-22 | 广州计量检测技术研究院 | Steel ruler calibration and measurement method, system and device and storage medium |
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