CN219511480U - LED line structure light high-precision contour measuring device - Google Patents
LED line structure light high-precision contour measuring device Download PDFInfo
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- CN219511480U CN219511480U CN202320769297.2U CN202320769297U CN219511480U CN 219511480 U CN219511480 U CN 219511480U CN 202320769297 U CN202320769297 U CN 202320769297U CN 219511480 U CN219511480 U CN 219511480U
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Abstract
The utility model relates to an LED line structured light high-precision contour measuring device which comprises a working platform, wherein a workpiece to be measured is placed in the middle of the working platform, an LED light source and an industrial camera are arranged above the working platform, the irradiation end of the LED light source faces downwards vertically and towards the workpiece to be measured, a diaphragm is fixedly arranged at the irradiation end of the LED light source, the diaphragm is in a flat plate shape, the periphery of the diaphragm is in sealing connection with the periphery of the irradiation end of the LED light source, a linear slit is arranged in the middle of the diaphragm, the industrial camera is positioned on one side of the workpiece to be measured, and the lens of the industrial camera faces downwards in an inclined manner and faces towards the workpiece to be measured. The utility model aims to solve or at least reduce the problem that laser speckle noise is formed by mutual interference of light rays when the laser is used as a measuring light source for contour measurement, and the contour measurement precision is affected.
Description
Technical Field
The utility model belongs to the technical field of optical contour measurement, and particularly relates to an LED line structure light high-precision contour measurement device.
Background
The line structured light method has wide application in the field of contour measurement due to the advantages of non-contact, high efficiency, simple structure and the like. The method mainly comprises the steps of collecting contour strips on the surface of a measured workpiece, extracting the center coordinates of the strips, and calculating the contour height by adopting a triangulation principle to finish measurement, wherein the most important is that the contour strips with high quality can be obtained. The line structure light profile measuring instrument formed in the market at present adopts laser as a measuring light source, and because the laser has high coherence, the light mutual interference can form laser speckle noise in the measuring process, so that the quality of line laser stripes is poor, the central coordinates of the stripes can not be extracted accurately, and the profile measuring precision is affected.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides an LED line structured light high-precision contour measuring device, which aims to solve or at least reduce the problems that laser speckle noise is formed and contour measuring precision is affected due to mutual interference of light rays when the laser is used as a measuring light source for contour measurement.
The utility model is realized by the following technical scheme:
the high-precision contour measuring device for the LED line structure light comprises a working platform, wherein a measured workpiece is placed in the middle of the working platform, and an LED light source and an industrial camera are arranged above the working platform;
the irradiation end of the LED light source is vertically downward and faces to the workpiece to be tested, the irradiation end of the LED light source is fixedly provided with a diaphragm, the diaphragm is in a flat plate shape, the periphery of the diaphragm is in sealing connection with the periphery of the irradiation end of the LED light source, and the middle of the diaphragm is provided with a linear slit;
the industrial camera is positioned on one side of the tested workpiece, and the lens of the industrial camera is inclined downwards and faces the tested workpiece.
In order to further realize the utility model, the following technical scheme can be preferably selected:
preferably, a workpiece adjusting table is arranged in the middle of the upper surface of the working platform, and the workpiece to be measured is placed on the workpiece adjusting table;
the workpiece adjusting table comprises a rotary table, a first pitching table and a second pitching table which are sequentially arranged from bottom to top, the middle part of the rotary table is rotationally arranged on the working platform, the first pitching table is longitudinally rotationally arranged above the rotary table, the second pitching table is longitudinally rotationally arranged above the first pitching table, the rotation direction of the first pitching table and the rotation direction of the second pitching table are mutually perpendicular, and the workpiece to be measured is placed on the upper surface of the second pitching table.
Preferably, a first guide plate and a second guide plate are vertically and fixedly arranged in the middle of the upper surface of the rotary table and in the middle of the upper surface of the first pitching table respectively, the first guide plate and the second guide plate are in an upward convex arc shape, and the first guide plate and the second guide plate are mutually vertical;
the middle part of the lower surface of the first pitching platform and the middle part of the lower surface of the second pitching platform are respectively provided with a first chute and a second chute, the first chute and the second chute are in an upward concave arc shape and respectively correspond to the first guide plate and the second guide plate, the height value of the first guide plate is larger than the depth value of the first chute, the height value of the second guide plate is larger than the depth value of the second chute, and the first chute and the second chute are respectively sleeved on the first guide plate and the second guide plate in a sliding way.
Preferably, two groups of positioning components are arranged between the rotating table and the first pitching table and between the first pitching table and the second pitching table, the two groups of positioning components are respectively arranged at two ends of the rotating direction of the first pitching table or the second pitching table, each positioning component comprises a positioning block and a positioning rod, each positioning block is arranged on the upper surface of the rotating table or the first pitching table in a sliding mode, one face of each positioning block, which faces the first pitching table or the second pitching table, is an inclined face, each inclined face abuts against the periphery of the lower surface of the first pitching table or the periphery of the lower surface of the second pitching table, each positioning rod is transversely arranged, one end of each positioning rod is rotatably connected to each positioning block, and each middle thread is sleeved on the rotating table or the first pitching table.
Preferably, a converging lens is arranged between the LED light source and the tested workpiece, and light rays emitted by the LED light source irradiate the tested workpiece through the converging lens.
Preferably, the lens of the industrial camera is a double telecentric lens.
Preferably, the vertical cradling piece that is provided with of work platform upper surface, from the top down has set gradually first installation arm, second installation arm and third installation arm on the cradling piece, the one end of first installation arm, second installation arm and third installation arm all slips the cover and closes in the cradling piece, LED light source and convergent lens are fixed respectively and are set up in the one end that first installation arm and second installation arm kept away from the cradling piece, the third installation arm is provided with the fourth installation arm, fourth installation arm one end is kept away from the one end of cradling piece with the third installation arm articulated, the other end fixedly connected with industrial camera.
Through the technical scheme, the utility model has the beneficial effects that:
1. the wide-spectrum LED light source is adopted, the coherence is low, interference speckle noise cannot be formed in the measuring process, high-quality fringe images can be acquired through an industrial camera, and the measuring precision of a line structured light method is improved.
2. The industrial camera with the double telecentric lens can reduce stripe image distortion errors and further improve measurement accuracy.
3. The position and the angle of the measuring light, the industrial camera and the measured workpiece can be flexibly adjusted through the bracket rod and the workpiece adjusting table so as to adapt to different measured workpieces and be easy to operate.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of a workpiece adjustment table according to the present utility model;
FIG. 3 is a top view of the workpiece adjustment stage of the present utility model;
FIG. 4 is a cross-sectional view taken at A-A in FIG. 3 in accordance with the present utility model;
FIG. 5 is a cross-sectional view taken at B-B in FIG. 3 in accordance with the present utility model;
FIG. 6 is a schematic view of a rotary table according to the present utility model;
FIG. 7 is one of the structural schematic diagrams of the first pitch stage of the present utility model;
FIG. 8 is a second schematic view of a first pitch stage according to the present utility model;
FIG. 9 is a schematic view of a positioning assembly according to the present utility model;
wherein: 1-a working platform; 2-LED light source; 3-an industrial camera; 4-diaphragm; 5-a workpiece adjusting table; 6-converging lens; 7-double telecentric lens; 8-supporting frame rods; 9-a first mounting arm; 10-a second mounting arm; 11-a third mounting arm; 12-fourth mounting arms; 501-a rotary table; 502-a first pitch stage; 503-a second pitch stage; 504-a first guide plate; 505-a second guide plate; 506-positioning blocks; 507-positioning the rod.
Detailed Description
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. 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.
Example 1:
as shown in fig. 1-9, the high-precision contour measuring device for the LED line structure light comprises a working platform 1, wherein a measured workpiece is placed in the middle of the working platform 1, and an LED light source 2 and an industrial camera 3 are arranged above the working platform 1;
the irradiation end of the LED light source 2 is vertically downward and faces to the workpiece to be tested, the irradiation end of the LED light source 2 is fixedly provided with a diaphragm 4, the diaphragm 4 is in a flat plate shape, the periphery of the diaphragm 4 is in sealing connection with the periphery of the irradiation end of the LED light source 2, and the middle part of the diaphragm 4 is provided with a linear slit;
the industrial camera 3 is located at one side of the workpiece to be measured, and the lens of the industrial camera 3 is inclined downward and toward the workpiece to be measured.
In order to facilitate the adjustment of the position state of the workpiece to be measured so as to improve the applicability, a workpiece adjusting table 5 is arranged in the middle of the upper surface of the working platform 1, and the workpiece to be measured is placed on the workpiece adjusting table 5;
the workpiece adjusting table 5 comprises a rotary table 501, a first pitching table 502 and a second pitching table 503 which are sequentially arranged from bottom to top, the middle part of the rotary table 501 is rotationally arranged on the working platform 1, the first pitching table 502 is longitudinally rotationally arranged above the rotary table 501, the second pitching table 503 is longitudinally rotationally arranged above the first pitching table 502, the rotation direction of the first pitching table 502 and the rotation direction of the second pitching table 503 are mutually perpendicular, and a workpiece to be measured is arranged on the upper surface of the second pitching table 503.
In order to optimize the product structure, ensure the reliability of the rotation of the first pitching platform 502 and the second pitching platform 503, a first guide plate 504 and a second guide plate 505 are respectively and vertically fixed in the middle of the upper surface of the rotating platform 501 and the middle of the upper surface of the first pitching platform 502, the first guide plate 504 and the second guide plate 505 are in the shape of convex circular arcs, and the first guide plate 504 and the second guide plate 505 are mutually vertical;
the middle part of the lower surface of the first pitching platform 502 and the middle part of the lower surface of the second pitching platform 503 are respectively provided with a first chute and a second chute, the first chute and the second chute are in an upward concave arc shape and are respectively arranged corresponding to the first guide plate 504 and the second guide plate 505, the height value of the first guide plate 504 is larger than the depth value of the first chute, the height value of the second guide plate 505 is larger than the depth value of the second chute, and the first chute and the second chute are respectively sheathed on the first guide plate 504 and the second guide plate 505 in a sliding way.
In order to guarantee the stability of first every single move platform 502 and second every single move platform 503 position when measuring, all be provided with two sets of locating component between revolving stage 501 and the first every single move platform 502 and between first every single move platform 502 and the second every single move platform 503, two sets of locating component set up respectively in the rotation direction both ends of first every single move platform 502 or second every single move platform 503, locating component includes locating piece 506 and locating lever 507, locating piece 506 slides and sets up in revolving stage 501 or first every single move platform 502 upper surface, the one side of locating piece 506 orientation first every single move platform 502 or second every single move platform 503 is the inclined plane, the inclined plane supports to first every single move platform 502 or second every single move platform 503 lower surface periphery, the locating lever 507 transversely sets up, locating lever 507 one end rotation is connected to locating piece 506, middle part screw thread cover is in revolving stage 501 or first every single move platform 502.
In order to improve measurement accuracy, the width of the linear light bar emitted by the LED light source 2 when the linear light bar irradiates the workpiece to be measured is as thin as possible, a converging lens 6 is arranged between the LED light source 2 and the workpiece to be measured, and light emitted by the LED light source 2 irradiates the workpiece to be measured through the converging lens 6.
In order to further improve the measurement accuracy and ensure the imaging effect of the industrial camera 3, the lens of the industrial camera 3 is a double telecentric lens 7.
In this embodiment, the focusing lens 6 is a focusing lens manufactured by Wei Zhi manufacturing and having a model number AFT-ZL0930, and the double telecentric lens 7 is a lens manufactured by Wei Zhi manufacturing and having a model number BT-2309.
For being convenient for adjust LED light source 2, assemble lens 6 and industry camera 3 relative measured workpiece's position state, work platform 1 upper surface is vertical to be provided with cradling piece 8, first installation arm 9 has been set gradually from the top down on the cradling piece 8, second installation arm 10 and third installation arm 11, the one end of first installation arm 9, second installation arm 10 and third installation arm 11 all slip-on in cradling piece 8, LED light source 2 and assemble lens 6 are fixed respectively and are set up in the one end that first installation arm 9 and second installation arm 10 kept away from cradling piece 8, third installation arm 11 is provided with fourth installation arm 12, the one end that cradling piece 8 was kept away from to fourth installation arm 12 one end and third installation arm 11 articulates, the other end fixedly connected with industry camera 3.
In actual measurement, the workpiece to be measured is placed on the workpiece adjusting table 5, and the state of the workpiece adjusting table 5 is adjusted so that the surface to be measured of the workpiece to be measured faces the LED light source 2. The first mounting arm 9 and the second mounting arm 10 are adjusted to be in the vertical position on the support rod 8, so that the LED light source 2 and the converging lens 6 are driven to move up and down, and LED linear light is projected to the surface of a workpiece to be measured. The up-down position of the third mounting arm 11 on the bracket rod 8 is adjusted to drive the industrial camera 3 to move up and down. The angle of the industrial camera 3 is adjusted by adjusting and rotating the fourth mounting arm 12, so that line structure light stripes on the measured workpiece can enter the field of view of the industrial camera 3. And collecting linear structure light fringes of the measured surface, extracting the center of the fringes, and finally calculating and obtaining the profile of the measured workpiece surface through a light triangulation principle.
Finally, it should be noted that: the foregoing description of the preferred embodiments of the present utility model is not intended to be limiting, but rather, it will be apparent to those skilled in the art that the foregoing description of the preferred embodiments of the present utility model can be modified or equivalents can be substituted for some of the features thereof, and any modification, equivalent substitution, improvement or the like that is within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (7)
1. The high-precision contour measuring device for the LED line structure light comprises a working platform (1), wherein a measured workpiece is placed in the middle of the working platform (1), and the high-precision contour measuring device is characterized in that an LED light source (2) and an industrial camera (3) are arranged above the working platform (1);
the LED light source (2) is characterized in that the irradiation end of the LED light source (2) is vertically downward and faces to a workpiece to be tested, a diaphragm (4) is fixedly arranged at the irradiation end of the LED light source (2), the diaphragm (4) is in a flat plate shape, the periphery of the diaphragm (4) is connected with the periphery of the irradiation end of the LED light source (2) in a sealing manner, and a linear slit is arranged in the middle of the diaphragm (4);
the industrial camera (3) is positioned on one side of the tested workpiece, and the lens of the industrial camera (3) is inclined downwards and faces the tested workpiece.
2. The LED line structured light high-precision contour measuring device according to claim 1, wherein a workpiece adjusting table (5) is arranged in the middle of the upper surface of the working platform (1), and the measured workpiece is placed on the workpiece adjusting table (5);
the workpiece adjusting table (5) comprises a rotary table (501), a first pitching table (502) and a second pitching table (503) which are sequentially arranged from bottom to top, the middle of the rotary table (501) is rotationally arranged on the working platform (1), the first pitching table (502) is longitudinally rotationally arranged above the rotary table (501), the second pitching table (503) is longitudinally rotationally arranged above the first pitching table (502), the rotation direction of the first pitching table (502) and the rotation direction of the second pitching table (503) are mutually perpendicular, and a workpiece to be measured is arranged on the upper surface of the second pitching table (503).
3. The high-precision contour measuring device for LED line structure light according to claim 2, wherein a first guide plate (504) and a second guide plate (505) are respectively and vertically fixedly arranged in the middle of the upper surface of the rotary table (501) and the middle of the upper surface of the first pitching table (502), the first guide plate (504) and the second guide plate (505) are in the shape of an upward convex arc, and the first guide plate (504) and the second guide plate (505) are mutually perpendicular;
the first pitching platform (502) lower surface middle part and second pitching platform (503) lower surface middle part are provided with first spout and second spout respectively, first spout and second spout are concave convex and set up with first baffle (504) and second baffle (505) correspondence respectively, and the height value of first baffle (504) is greater than the depth value of first spout, and the height value of second baffle (505) is greater than the depth value of second spout, and first spout and second spout slip fit in first baffle (504) and second baffle (505) respectively.
4. A LED line structured light high-precision contour measurement apparatus according to claim 3, characterized in that, two sets of positioning components are disposed between the turntable (501) and the first pitching stage (502) and between the first pitching stage (502) and the second pitching stage (503), the two sets of positioning components are disposed at two ends of the rotation direction of the first pitching stage (502) or the second pitching stage (503), respectively, the positioning components comprise a positioning block (506) and a positioning rod (507), the positioning block (506) is slidably disposed on the upper surface of the turntable (501) or the first pitching stage (502), one surface of the positioning block (506) facing the first pitching stage (502) or the second pitching stage (503) is an inclined surface, the inclined surface abuts against the periphery of the lower surface of the first pitching stage (502) or the second pitching stage (503), the positioning rod (507) is laterally disposed, one end of the positioning rod (507) is rotatably connected to the positioning block (506), and the middle part is in threaded sleeve with the turntable (501) or the first pitching stage (502).
5. The high-precision contour measuring device for LED line structure light according to claim 1, wherein a converging lens (6) is arranged between the LED light source (2) and the measured workpiece, and light rays emitted by the LED light source (2) irradiate the measured workpiece through the converging lens (6).
6. The LED line structured light high precision profile measurement device according to claim 1, characterized in that the lens of the industrial camera (3) is a double telecentric lens (7).
7. The LED line structured light high-precision contour measurement device according to claim 5, wherein the support rod (8) is vertically disposed on the upper surface of the working platform (1), the first mounting arm (9), the second mounting arm (10) and the third mounting arm (11) are sequentially disposed on the support rod (8) from top to bottom, one ends of the first mounting arm (9), the second mounting arm (10) and the third mounting arm (11) are slidably sleeved on the support rod (8), the LED light source (2) and the converging lens (6) are respectively fixedly disposed at one ends of the first mounting arm (9) and the second mounting arm (10) far away from the support rod (8), the third mounting arm (11) is provided with a fourth mounting arm (12), one end of the fourth mounting arm (12) is hinged with one end of the third mounting arm (11) far away from the support rod (8), and the other end is fixedly connected with the industrial camera (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320769297.2U CN219511480U (en) | 2023-04-10 | 2023-04-10 | LED line structure light high-precision contour measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320769297.2U CN219511480U (en) | 2023-04-10 | 2023-04-10 | LED line structure light high-precision contour measuring device |
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| CN219511480U true CN219511480U (en) | 2023-08-11 |
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| CN202320769297.2U Active CN219511480U (en) | 2023-04-10 | 2023-04-10 | LED line structure light high-precision contour measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116817796A (en) * | 2023-08-23 | 2023-09-29 | 武汉工程大学 | Method and device for measuring precision parameters of curved surface workpiece based on double telecentric lenses |
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2023
- 2023-04-10 CN CN202320769297.2U patent/CN219511480U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116817796A (en) * | 2023-08-23 | 2023-09-29 | 武汉工程大学 | Method and device for measuring precision parameters of curved surface workpiece based on double telecentric lenses |
| CN116817796B (en) * | 2023-08-23 | 2023-11-24 | 武汉工程大学 | Method and device for measuring precision parameters of curved surface workpiece based on double telecentric lenses |
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