CN216348420U - Line profile measuring device based on machine vision - Google Patents
Line profile measuring device based on machine vision Download PDFInfo
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- CN216348420U CN216348420U CN202123110831.9U CN202123110831U CN216348420U CN 216348420 U CN216348420 U CN 216348420U CN 202123110831 U CN202123110831 U CN 202123110831U CN 216348420 U CN216348420 U CN 216348420U
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Abstract
The utility model provides a line profile measuring device based on machine vision, which comprises a camera part, a rotary table part and a control and analysis part, wherein the camera part comprises a camera support table, a camera adjusting frame and a high-precision industrial camera, the rotary table part comprises a high-precision rotary table, a special clamp, a grating and a detection head, and the control and analysis part comprises a computer and a servo motor. The line profile measuring device based on machine vision improves the measurement precision and the measurement range of workpieces by using non-contact measurement, is convenient to operate, has high measurement efficiency, and has higher application value.
Description
Technical Field
The utility model relates to the technical field of line profile detection, in particular to a line profile measuring device based on machine vision.
Background
The line profile is a requirement for a curve shape, is an index for limiting the variation of an actual curve to an ideal curve, is a shape tolerance when no reference is required, and is a position tolerance when the reference is required.
How to rapidly and accurately measure the line profile of a certain profile line of a workpiece is always an important research direction in the field of geometric metrology. The detection methods commonly used for the line profile include a template method, a profiling method, a projection method and a coordinate method, and the methods mainly have the defects of low measurement precision, reduced measurement precision due to contact abrasion of a measurement tool and a workpiece along with increase of measurement times, small measurement range and the like.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a line profile measuring device based on machine vision, which solves the problems in the background technology.
In order to achieve the purpose, the utility model is realized by the following technical scheme: a line profile measuring device based on machine vision comprises a camera component, a turntable component and a control and analysis component; the camera component comprises a camera support table, a camera adjusting frame and a high-precision industrial camera, wherein a camera positioning block is arranged on the camera support table, and the camera adjusting frame comprises a sliding rail and a lifting mechanism; the turntable component comprises a high-precision turntable, a special fixture and a grating, wherein the special fixture fixes a workpiece to be measured on the turntable, the high-precision industrial camera captures images when the turntable rotates, and the grating is arranged between the turntable and the high-precision turntable; the control and analysis component comprises a computer and a servo motor, the high-precision rotary table is driven by the servo motor, the servo motor is provided with an encoder and a controller, position information monitored by the grating can be input into the controller, the controller is connected with the computer through a USB (universal serial bus) line, and the computer is connected with the high-precision industrial camera through a gigabit network line, so that data and commands are transmitted.
Further, the high-precision industrial camera is installed on the camera supporting table, the lifting mechanism utilizes a ball screw to realize lifting motion, and the sliding rail and the lifting mechanism are respectively used for adjusting the horizontal distance and the vertical distance between the high-precision industrial camera and a workpiece to be measured so as to ensure that the shooting center of the high-precision industrial camera is just aligned with the profile to be measured.
Furthermore, the rotation of the high-precision turntable and the image taking interval of the high-precision industrial camera are controlled by the computer, and the grating can monitor the rotating angle of the turntable in real time.
Furthermore, the high-precision industrial camera is provided with an infrared laser generator and a lens, wherein the lens is used for collecting laser irradiated on a workpiece to be detected and reflected back.
The utility model has the beneficial effects that: according to the line profile measuring device based on machine vision, the camera component, the turntable component and the control and analysis component are matched for use, and non-contact measurement is utilized, so that the problem of abrasion caused by excessive measurement times can be avoided, and the measurement precision of the line profile is not influenced; meanwhile, the measurement range is large, if the size of the workpiece to be measured is small, a required magnifying lens can be additionally arranged on the high-precision industrial camera, if the size of the workpiece to be measured is large, the workpiece can be partially shot, and then the images are spliced, so that the measurement is completed.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a slide rail;
fig. 3 is a schematic structural diagram of the lifting mechanism.
Wherein, 1, a high-precision turntable; 1.1, a servo motor; 1.2, a turntable; 2. a camera mount; 3. a camera adjusting bracket; 4. a slide rail; 5. a computer; 6. a camera positioning block; 7. high precision industrial cameras; 8. a limiting plate; 9. a hand wheel; 10. and (4) a support column.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, a high-precision industrial camera 7 is mounted on the camera mount 2 and fixed by a camera positioning block 6; the pose of the high-precision industrial camera 7 is adjusted by a slide rail 4 and a lifting mechanism shown in figure 3; the slide rail 4 can be provided with a positioning pin and combined with a limiting plate 8, so that the horizontal distance between the high-precision industrial camera 7 and a workpiece can be accurately limited; by rotating the upper hand wheel 9, the camera mount 2 is lifted by the ball screw, thereby defining the vertical distance between the high-precision industrial camera 7 and the workpiece.
In the high-precision rotary table 1, a servo motor 1.1 provides power for a rotary table 1.2 through worm transmission, and special fixtures of different types can be installed on the rotary table 1.2 aiming at different workpieces.
When the line profile measuring device based on machine vision is used for measurement, the following steps are required to be carried out:
step 1: starting a high-precision industrial camera 7 arranged on a camera support platform 2 and a servo motor 1.1;
step 2: the imaging quality of the high-precision industrial camera can be observed in the computer 5, the relative position of the high-precision industrial camera 7 and the turntable 1.2 is adjusted through the camera adjusting frame 3, meanwhile, certain options in the high-precision industrial camera are set to improve the imaging quality, and the measurement object at the moment is the upper contour line of the turntable 1.2;
and step 3: after the adjustment is finished, the computer 5 controls the servo motor 1.1 to move, meanwhile, the grating detector 4 is started to monitor the rotating angle of the turntable 1.2, when the grating detector 4 monitors that the turntable rotates for 360 degrees, the computer 5 controls the servo motor to stop, and the shot picture is processed through the stored algorithm;
and 4, step 4: outputting measurement data, taking out two points with the minimum depth and the maximum depth, respectively naming the two points as A, B to be recorded as zero points, and recording angle data read by the grating detection head 4 at the moment by the computer 5;
and 5: the servo motor drives the turntable 1.2 to move to a middle angle C of A, B degrees, namely A, B and a camera light source point are collinear, and at the moment, a special clamp is placed to ensure that a long axis of a measuring workpiece is coincided with a A, B connecting line and a rotating center of the workpiece is coincided with a geometric center;
step 6: repeating the operations (2), (3) and (4), changing the measuring object into a workpiece to be measured, and calculating the eccentric amount e of the workpiece to be measured;
and 7: when the grating detection head 4 detects that the rotation has been performed again by 360 degrees, the measurement is stopped;
and 8: the measured data is compared with the standard data on the computer 5, and the final data is screened by setting a threshold value so as to reach the threshold value range as effective data.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A machine vision-based line profile measurement apparatus, comprising:
the camera component comprises a camera support table, a camera adjusting frame and a high-precision industrial camera, wherein a camera positioning block is arranged on the camera support table, and the camera adjusting frame comprises a sliding rail and a lifting mechanism;
the rotary table component comprises a high-precision rotary table, a special fixture and a grating, the special fixture fixes a workpiece to be measured on the rotary table, the high-precision industrial camera captures images when the rotary table rotates, and the grating is arranged between the rotary table and the high-precision rotary table;
the control and analysis component comprises a computer and a servo motor, the high-precision rotary table is driven by the servo motor, the servo motor is provided with an encoder and a controller, position information monitored by the grating can be input into the controller, the controller is connected with the computer through a USB (universal serial bus) line, and the computer is connected with the high-precision industrial camera through a gigabit network line, so that data and commands are transmitted.
2. The machine-vision-based line profile measurement device of claim 1, wherein: the high-precision industrial camera is installed on the camera supporting table, the lifting mechanism utilizes a ball screw to realize lifting motion, and the sliding rail and the lifting mechanism are respectively used for adjusting the horizontal distance and the vertical distance between the high-precision industrial camera and a workpiece to be detected so as to ensure that the camera shooting center of the high-precision industrial camera is just aligned with the profile to be detected.
3. The machine-vision-based line profile measurement device of claim 1, wherein: the rotation of the high-precision rotary table and the image taking interval of the high-precision industrial camera are controlled by the computer, and the grating can monitor the rotating angle of the rotary table in real time.
4. The machine-vision-based line profile measurement device of claim 1, wherein: the high-precision industrial camera is provided with an infrared laser generator and a lens, and the lens is used for collecting laser irradiated on a workpiece to be detected and reflected back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202123110831.9U CN216348420U (en) | 2021-12-13 | 2021-12-13 | Line profile measuring device based on machine vision |
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| CN202123110831.9U CN216348420U (en) | 2021-12-13 | 2021-12-13 | Line profile measuring device based on machine vision |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116222464A (en) * | 2023-05-08 | 2023-06-06 | 江苏省计量科学研究院(江苏省能源计量数据中心) | High-precision linear displacement detection system |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116222464A (en) * | 2023-05-08 | 2023-06-06 | 江苏省计量科学研究院(江苏省能源计量数据中心) | High-precision linear displacement detection system |
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