CN115742304A - Optical machine correction system and method for 3D printing equipment - Google Patents
Optical machine correction system and method for 3D printing equipment Download PDFInfo
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- CN115742304A CN115742304A CN202310015177.8A CN202310015177A CN115742304A CN 115742304 A CN115742304 A CN 115742304A CN 202310015177 A CN202310015177 A CN 202310015177A CN 115742304 A CN115742304 A CN 115742304A
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Abstract
The invention discloses an optical machine correction system and method for 3D printing equipment, and relates to the technical field of 3D printing. The optical-mechanical correction system comprises an adjusting device, a camera device, an image processing device, a rack, a printing platform, a moving device and an optical machine, wherein the printing platform, the moving device and the optical-mechanical are arranged on the rack; the optical machine is positioned below the printing platform, and the moving device is positioned above the printing platform and can move up and down relative to the printing platform; the adjusting device is detachably connected to the moving device; the camera device is arranged on the adjusting device and comprises a camera with a lens facing the printing platform; the adjusting device is used for driving the camera to horizontally move or lift and move, and the camera is used for shooting actual patterns projected to the printing platform by the optical machine; the image processing device is in communication connection with the camera and is used for acquiring the number of light spots and pixel values in the photo shot by the camera. The technical scheme of the invention can solve the problems of complex operation and low measurement precision of the existing optical-mechanical correction method.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to an optical machine correction system and method for 3D printing equipment.
Background
The existing printers using the DLP (Digital Light Processing) technical principle all face the problem of installation and calibration, and the DLP optical machine has the best design working distance, and when the working distance of actual installation is equal to the design working distance, the size of the projected Light spot and the size of the Light spot array reach the design value. In the near sub-range of design working distance (beyond the scope then unable focus), can still make the ray apparatus project the upper surface from the type membrane through rotating the focus ring on the adjustment ray apparatus camera lens. However, if the projected working distance deviates from the designed working distance, a rectangular pattern whose maximum size can be obtained can be projected, and the projected size of a single spot or pixel no longer meets the designed value.
Such deviations in projected dimensions due to installation distances may not only result from self-assembly, but also may be caused by mechanical part dimensions, clearances, etc. for fastening; another reason is that the projected pattern needs to be focused on the upper surface of the release film, light inevitably undergoes slight refraction after passing through the glass and the release film, and the change of the optical path may cause slight deviation of the working distance. The actual projected size of the pattern needs to be detected to correct the mounting position of the optical machine to be at the design working distance. However, since the projection size of each spot is small, high-precision measurement is required; and the UV light is inconvenient to use naked eyes to directly observe and measure, so that the problems of complex operation and low measurement precision exist in the conventional optical machine correction method when the actual projection size of the pattern is detected.
Disclosure of Invention
The invention mainly aims to provide an optical machine correction system for 3D printing equipment, and aims to solve the problems of complex operation and low measurement precision of the existing optical machine correction method.
In order to achieve the above object, the present invention provides an optical machine calibration system for a 3D printing apparatus, comprising:
the device comprises a rack, a printing platform arranged on the rack, a moving device and an optical machine, wherein the optical machine is positioned below the printing platform, the moving device is positioned above the printing platform, the moving device can move up and down relative to the printing platform, and the moving device can be used for installing a forming platform of the 3D printing equipment;
the adjusting device is detachably connected to the moving device;
the camera device is arranged on the adjusting device and comprises a camera, and a lens of the camera faces the printing platform; the adjusting device is used for driving the camera to horizontally move or lift and move, and the camera is used for shooting actual patterns projected to the printing platform by the light machine;
and the image processing device is in communication connection with the camera and is used for acquiring the number of light spots and pixel values in a photo shot by the camera.
In an embodiment, camera device still includes telecentric mirror head, telecentric mirror head install in the camera lens department of camera, and court print platform extends the setting, telecentric mirror head orientation print platform's one side is provided with the UV light filter layer.
In an embodiment, adjusting device connects gradually first switching portion, regulating part and second switching portion including, first switching portion is used for connecting the mobile device, second switching portion is used for connecting camera device, the regulating part is including the first slip table and the second slip table of range upon range of setting, first slip table is used for driving camera device carries out vertical migration or lateral shifting, the second slip table is used for driving camera device carries out longitudinal movement.
In an embodiment, first slip table is including first slide, second slide and the third slide of range upon range of setting, and connect the horizontal adjust knob of first slide and second slide, connection the vertical adjust knob of second slide and third slide, first slide is connected first switching portion, horizontal adjust knob is used for driving the relative first slide of second slide carries out lateral shifting, vertical adjust knob is used for driving the relative second slide of third slide carries out vertical shifting.
The invention also provides an optical-mechanical correction method based on the optical-mechanical correction system for the 3D printing equipment, which comprises the following steps:
the method comprises the following steps: acquiring an actual physical size A corresponding to a unit pixel in a photo shot by the camera device in a focusing manner;
step two: adjusting the mobile device to enable the camera device to be focused on the printing platform;
step three: adjusting the optical machine to enable the pattern projected by the optical machine to be focused on the printing platform;
step four: adjusting the adjusting device to enable the camera device to focus on the actual pattern projected onto the printing platform and shoot;
step five: acquiring a pixel value corresponding to a single light spot in the shot actual pattern photo through the image processing device, and combining an actual physical size A corresponding to the single pixel in the step one to obtain an actual physical size B corresponding to the single light spot in the shot actual pattern photo; if the actual physical size B corresponding to the unit light spot is smaller than the set physical size C corresponding to the unit light spot, the distance between the optical machine and the printing platform is adjusted to be far; if the actual physical size B corresponding to the unit light spot is larger than the set physical size C corresponding to the unit light spot, the distance between the optical machine and the printing platform is adjusted to be close;
step six: and repeating the third step to the fifth step until the actual physical size B corresponding to the unit light spot is consistent with the set physical size C corresponding to the unit light spot.
In an embodiment, the step of obtaining the actual physical size a corresponding to a unit pixel in a photo focused and taken by the image capturing device specifically includes:
focusing and shooting a standard sample piece with the length of D by using the camera device;
acquiring a pixel value E corresponding to the length of a standard sample in a shot standard sample photo through the image processing device;
and calculating the actual physical size A = D/E corresponding to the unit pixel.
In an embodiment, the resolution of the optical machine is F, the actual pattern size projected to the printing platform by the optical machine at a set distance is H, and the set physical size C = H/F corresponding to a unit spot.
In an embodiment, the step five of obtaining the actual physical size B corresponding to the unit light spot in the shot actual pattern photo specifically includes:
acquiring the number X of light spots on any straight line and a pixel value Y corresponding to the straight line in a shot actual pattern photo through the image processing device;
and calculating the actual physical size B = (Y × A/X) corresponding to the unit light spot.
In an embodiment, in the step of obtaining the pixel value Y corresponding to the straight line, the start point and the end point of the straight line are regarded as a complete unit pixel.
In an embodiment, in the sixth step, when a difference between the actual physical dimension B corresponding to the unit spot and the set physical dimension C corresponding to the unit spot is not greater than 1% of the set physical dimension C corresponding to the unit spot, it is determined that the actual physical dimension B corresponding to the unit spot matches the set physical dimension C corresponding to the unit spot.
According to the technical scheme, the camera device is focused on the printing platform through adjustment, the optical machine is focused on the printing platform, after an actual pattern projected to the printing platform by the optical machine falls within the visual field range of the camera, the camera shoots to obtain a photo containing part or all of the actual pattern; after the number and the pixel value of the light spots in the photo are measured by the image processing device, the pixel value corresponding to the unit light spot can be calculated, and the actual physical size corresponding to the unit light spot in the shot actual pattern photo can be obtained by combining the actual physical size corresponding to the unit pixel in the shot photo shot by the known camera. Comparing the two sizes to measure the deviation between the actual working distance and the designed working distance of the optical machine; after the comparison of the two sizes and the adjustment of the working distance of the optical machine are repeated, the optical machine can be closer to the set working distance, and the correction of the installation position of the optical machine is realized.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of an optical-mechanical calibration system for a 3D printing apparatus according to the present invention;
fig. 2 is a schematic view illustrating an adjusting device installed on a frame in an embodiment of an optical-mechanical calibration system for a 3D printing apparatus according to the present invention;
fig. 3 is an exploded view of an adjusting device in an embodiment of the optical-mechanical calibration system for 3D printing apparatus according to the present invention;
FIG. 4 is a schematic structural view of a first slide table in FIG. 3;
fig. 5 is a sectional view of the second slide table in fig. 3;
fig. 6 is a schematic flowchart of an embodiment of an optical-mechanical calibration method of an optical-mechanical calibration system for a 3D printing apparatus according to the present invention.
The reference numbers indicate:
| reference numerals | Name(s) | Reference numerals | Name(s) |
| 10 | Optical |
100 | |
| 110 | |
111 | |
| 112 | |
200 | |
| 300 | |
400 | Adjusting |
| 410 | |
420 | Adjusting |
| 421 | First sliding table | 4211 | |
| 4212 | |
4213 | |
| 4214 | Transverse adjusting |
4215 | |
| 422 | Second sliding table | 4221 | The |
| 4222 | Fifth |
4223 | |
| 4224 | |
430 | Second switching |
| 500 | |
510 | |
| 520 | Telecentric lens |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions relating to "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an optical machine correction system for 3D printing equipment, which can conveniently and accurately correct the installation position of an optical machine in the 3D printing equipment.
Referring to fig. 1 and fig. 2, in the present embodiment, the optical engine calibration system 10 includes an adjusting device 400, a camera 500, an image processing device (not shown), a frame 100, and a printing platform 200, a moving device 110 and an optical engine 300 disposed on the frame 100. The optical machine 300 is located below the printing platform 200, the moving device 110 is located above the printing platform 200, the moving device 110 can move up and down relative to the printing platform 200, and the moving device 110 can be used for installing a forming platform of the 3D printing apparatus; the adjusting device 400 is detachably connected to the moving device 110; the image capturing device 500 is installed on the adjusting device 400, the image capturing device 500 includes a camera 510, and a lens of the camera 510 faces the printing platform 200; the adjusting device 400 is configured to drive the camera 510 to perform horizontal movement or lifting movement, and the camera 510 is configured to capture an actual pattern projected by the optical machine 300 onto the printing platform 200; the image processing device is connected to the camera 510 for communication and is used to obtain the number of light spots and pixel values in the photos taken by the camera 510.
The optical machine 300 has an optimal design working distance, and when the actual installation working distance is equal to the design working distance, the size of the projected light spot and the size of the light spot array reach the design value. That is, the optical machine 300 is known to have a set physical size corresponding to a unit light spot in an actual pattern projected to the printing platform 200 at a set distance. The camera 500, whether including the telecentric lens 520 or only the camera 510, can obtain the actual physical size of the unit pixel in the focused photo. The camera 500 is adjusted to focus on the printing platform 200, and the optical machine 300 is focused on the printing platform 200, and after the actual pattern projected by the optical machine 300 onto the printing platform 200 falls within the visual field range of the camera 510, the camera 510 takes a picture containing part or all of the actual pattern. After the number and the pixel value of the light spots in the photo are measured by the image processing device, the pixel value corresponding to the unit light spot can be calculated, and the actual physical size corresponding to the unit light spot in the shot actual pattern photo can be obtained by combining the known actual physical size corresponding to the unit pixel. By comparing the two dimensions, the deviation between the actual working distance and the designed working distance of the optical machine 300 can be measured. Specifically, if the actual physical size corresponding to the unit light spot is smaller than the set physical size corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted to be far away; if the actual physical size corresponding to the unit light spot is larger than the set physical size corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted to be close. After the comparison of the two dimensions and the adjustment of the working distance of the optical engine 300 are repeated, the optical engine 300 can be closer to the set working distance, and the correction of the installation position of the optical engine 300 is realized.
The 3D printing apparatus generally includes a forming platform installed on the mobile device 110, and before the 3D printing apparatus runs a printing job, the installed position of the optical machine 300 is corrected by the optical machine correction system 10; after the correction is completed, the adjusting device 400 is detached, and the forming platform is installed on the moving device 110, so that the 3D printing apparatus can sequentially perform the printing operation. And because the adjusting device 400 and the camera device 500 are arranged at the mounting position of the forming platform, the camera device 500 is not blocked by the forming platform when shooting the projection pattern on the printing platform 200, so that the shooting process is more convenient.
Further, in an embodiment, the image capturing apparatus 500 further includes a telecentric lens 520, the telecentric lens 520 is installed at the lens of the camera 510, and extends toward the printing platform 200, and a UV light filtering layer is disposed on one side of the telecentric lens 520 toward the printing platform 200.
The telecentric lens 520 has a depth of field function, and allows a certain range of deviation based on the focus of the camera 510, so as to ensure that the pattern in the shot photo is not distorted, and compensate the situation that the camera 510 is not installed in place to a certain extent. On the other hand, telecentric lens 520 can improve the precision of the camera 510 taking photos, for example, when the magnification of telecentric lens 520 is 2 times, under the condition that the pixel value of the photos taken by camera 510 is not changed, the actual physical size corresponding to the unit pixel is half of the original sensor of camera 510, the quality of taking photos is improved, the subsequent accuracy of measuring the actual size of the projection patterns of the optical machine 300 is also improved, and finally the adjustment of the installation position of the optical machine 300 is more accurate. Correspondingly, the field of view of the camera 510 is reduced by half, and when the actual pattern projected onto the printing platform 200 by the optical machine 300 is photographed by the camera 510, the position of the camera 510 needs to be adjusted by the adjusting device 400, so that the actual pattern is located within the field of view of the camera 510.
The DLP digital light processing technology is a working principle of a 3D printing apparatus, and the optical machine 300 located below the printing platform 200 emits UV light and projects the UV light on the printing platform 200 to form a set pattern. The sensor of the camera 510 may be a CCD sensor or a COMS sensor, and no matter the CCD sensor or the COMS sensor, some UV light bands may interfere with the sensor to form an optical signal, so that when the camera 510 shoots the actual pattern projected by the optical machine 300, uneven shadow light spots may appear around the bright light spots forming the actual pattern, and the state of the shadow light spots is unstable, and irregular flicker may occur, which affects the observation of the bright light spots forming the actual pattern. By disposing the UV light filtering layer on the side of the telecentric lens 520 facing the printing platform 200, the UV light band causing interference can be filtered, and the error of observing the actual pattern can be reduced. Specifically, the UV light filtering layer may be formed by uniformly coating a UV-proof coating on the outer side of the telecentric lens 520, or by adding a UV light filter, such as a UV light filter, on the outer side of the telecentric lens 520. It can be understood that when the image capturing apparatus 500 does not include the telecentric lens 520, the UV light filtering layer disposed outside the lens of the camera 510 can also achieve the same effect, and the description thereof is omitted.
Referring to fig. 2 to 5, in an embodiment, the adjusting device 400 includes a first adapting portion 410, an adjusting portion 420, and a second adapting portion 430, which are sequentially connected, the first adapting portion 410 is configured to be connected to the moving device 110, the second adapting portion 430 is configured to be connected to the image capturing device 500, the adjusting portion 420 includes a first sliding table 421 and a second sliding table 422, which are stacked, the first sliding table 421 is configured to drive the image capturing device 500 to vertically move or horizontally move, and the second sliding table 422 is configured to drive the image capturing device 500 to longitudinally move.
Specifically, first slip table 421 includes first slide 4211, second slide 4212 and the third slide 4213 of range upon range of setting, and connects horizontal adjust knob 4214, the connection of first slide 4211 and second slide 4212 and the vertical adjust knob 4215 of third slide 4212 and third slide 4213, first slide 4211 is connected first switching portion 410, horizontal adjust knob 4214 is used for driving the relative first slide 4211 of second slide 4212 carries out lateral shifting, vertical adjust knob 4215 is used for driving the relative second slide 4212 of third slide 4213 carries out vertical movement.
Second slip table 422 includes fourth slide plate 4221, fifth slide plate 4222, vertical adjust knob 4223 and driving medium 4224, fourth slide plate 4221 and fifth slide plate 4222 set up range upon range of, fourth slide plate 4221 connects third slide plate 4213, fifth slide plate 4222 connects second switching portion 430, vertical adjust knob 4223 connects fourth slide plate 4221, driving medium 4224 rotate connect in fourth slide plate 4221 and be located between fourth slide plate 4221 and the fifth slide plate 4222, driving medium 4224 is including the first transmission portion and the second transmission portion that are the angle connection, first transmission portion butt longitudinal adjust knob 4223, second transmission portion butt fifth slide plate 4222, vertical adjust knob 4223 butt pushes when first transmission portion, transmission medium 4224 rotates and second transmission portion butt pushes fifth slide plate 4222, make keep away from fifth slide plate 4222 removes towards the direction of fourth slide plate 4221, namely longitudinal movement. When the longitudinal adjustment knob 4223 is adjusted in a direction away from the transmission member 4224, the transmission member 4224 rotates the second transmission portion in a direction away from the fifth slide plate 4222 by using its own torque, the second transmission portion releases the blocking of the fifth slide plate 4222, and the fifth slide plate 4222 moves toward the fourth slide plate 4221.
The moving device 110 includes a slide rail 111 vertically extending and disposed, and a slider 112 slidably connected to the slide rail 111, wherein the slider 112 can move up and down along the slide rail 111. The first transfer portion 410 and the sliding block 112 are provided with corresponding screw holes, and the first transfer portion 410 is matched with the screw holes through bolts or screws to be detachably connected with the sliding block 112. The adjusting device 400 realizes the lifting movement relative to the printing platform 200 through the slider 112, and the image capturing device 500 is mounted on the adjusting device 400, so as to finally realize the lifting movement of the image capturing device 500 relative to the printing platform 200.
Similarly, the third sliding plate 4213 and the fourth sliding plate 4221 may be provided with corresponding screw holes, and the third sliding plate 4213 and the fourth sliding plate 4221 are connected by bolts or screws in cooperation with the screw holes; corresponding screw holes can be formed in the fifth sliding plate 4222 and the second adapter part 430, and the fifth sliding plate 4222 and the second adapter part 430 are connected through matching of bolts or screws and the screw holes.
It can be understood that the first sliding plate 4211, the second sliding plate 4212, the third sliding plate 4213, the fourth sliding plate 4221 and the fifth sliding plate 4222 are stacked, the second adapter 430 is connected to the fifth sliding plate 4222, the image pickup device 500 is connected to the fifth sliding plate 4222 through the second adapter 430, and when the second sliding plate 4212 moves relative to the first sliding plate 4211 and the third sliding plate 4213 moves relative to the second sliding plate or the fifth sliding plate 4222 moves relative to the fourth sliding plate 4221, the image pickup device 500 is driven to move correspondingly, so that the horizontal movement or the vertical movement of the image pickup device 500 is realized.
The invention further provides an optical-mechanical correction method based on the optical-mechanical correction system 10 for the 3D printing device.
Referring to fig. 6, in the present embodiment, the method for calibrating an optical engine for a 3D printing apparatus includes the following steps:
step one S100: acquiring an actual physical size A corresponding to a unit pixel in a photo shot by the camera device 500 in a focusing manner;
step two S200: adjusting the mobile device 110 to focus the camera device 500 on the printing platform 200;
step three S300: adjusting the optical engine 300 so that the pattern projected by the optical engine 300 is focused on the printing platform 200;
step four S400: adjusting the adjusting device 400 so that the camera device 500 focuses on the actual pattern projected onto the printing platform 200 and performs shooting;
step five S500: acquiring a pixel value corresponding to a single light spot in the shot actual pattern photo through the image processing device, and combining an actual physical size A corresponding to the single pixel in the step one to obtain an actual physical size B corresponding to the single light spot in the shot actual pattern photo; if the actual physical size B corresponding to the unit light spot is smaller than the set physical size C corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted to be far; if the actual physical size B corresponding to the unit light spot is larger than the set physical size C corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted to be close;
step six S600: and repeating the third step S300 to the fifth step S500 until the actual physical size B corresponding to the unit light spot is consistent with the set physical size C corresponding to the unit light spot.
The principle of the optical-mechanical correction method is as follows: the optical engine 300 has an optimal design working distance, and when the actual installation working distance is equal to the design working distance, the size of the projected light spot and the size of the light spot array reach the design values. That is, the optical machine 300 is known to have a set physical size C corresponding to a unit light spot in an actual pattern projected to the printing platform 200 at a set distance. The camera 500, whether including the telecentric lens 520 or only the camera 510, can obtain the actual physical size a corresponding to the unit pixel in the focused photograph. The camera device 500 is adjusted to focus on the printing platform 200, the optical machine 300 is adjusted to focus on the printing platform 200, and after the actual pattern projected by the optical machine 300 onto the printing platform 200 falls within the visual field range of the camera 510, the camera 510 takes a picture containing part or all of the actual pattern. The image processing device measures the pixel value corresponding to the unit light spot in the photo, and then the actual physical size A corresponding to the known unit pixel is combined, so that the actual physical size B corresponding to the unit light spot in the shot actual pattern photo can be obtained. Comparing the B value with the C value, the deviation between the actual working distance and the designed working distance of the optical machine 300 can be measured. Specifically, if the actual physical size B corresponding to the unit light spot is smaller than the set physical size C corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted to be far away; if the actual physical size B corresponding to the unit light spot is larger than the set physical size C corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted to be close. After the comparison between the B value and the C value and the adjustment of the working distance of the optical machine 300 are repeated, the optical machine 300 can be made to approach the set working distance more and more, and the correction of the installation position of the optical machine 300 is realized.
Specifically, the resolution of the optical machine 300 is F, the actual pattern size projected to the printing platform 200 by the optical machine 300 at the set working distance is H, and the set physical size C = H/F corresponding to the unit spot. For example, the resolution of the optical engine 300 is 1920 × 1080, the actual size of the pattern projected onto the printing platform 200 over a set working distance is 96 × 54mm, and the set physical size corresponding to a unit spot is 50 × 50 μm.
It can be understood that the actual pattern projected by the optical engine 300 is actually located on the release film of the printing platform 200, and the release film generally has some unavoidable lines such as scratches, and in the step of adjusting the moving device 110 to focus the camera device 500 on the printing platform 200, when the camera 510 can observe the scratch lines in the field of view until the scratch lines are clearest, we think that the camera 510 is focusing on the surface of the release film.
The step of adjusting the optical machine 300 so that the pattern projected by the optical machine 300 is focused on the printing platform 200 specifically includes: while the optical machine 300 projects any pattern on the release film, the focusing ring of the lens of the optical machine 300 is adjusted to make the projected pattern reach the clearest or the maximum contrast on the release film, and at this time, the pattern projected by the optical machine 300 is considered to be projected on the upper surface of the release film and reach focusing.
Specifically, in an embodiment, the step S100 of acquiring the actual physical size a corresponding to a unit pixel in a photo focused by the image capturing device 500 includes:
focusing and shooting a standard sample with the length of D by using the camera device 500;
acquiring a pixel value E corresponding to the length of a standard sample in a shot standard sample photo through the image processing device;
and calculating the actual physical size A = D/E corresponding to the unit pixel.
Further, in the fifth step S500, the process of obtaining the actual physical size B corresponding to the unit light spot in the shot actual pattern photo specifically includes:
acquiring the number X of light spots on any straight line and a pixel value Y corresponding to the straight line in a shot actual pattern photo through the image processing device;
the actual physical dimension B = (Y × a/X) for the unit spot is calculated.
Specifically, in the step of obtaining the pixel value Y corresponding to the straight line, the start point and the end point of the straight line are both regarded as a complete unit pixel. Considering that the start point and the end point of the light spot straight line are not necessarily a complete unit pixel when measuring the pixel value corresponding to the straight line, and the integral multiple of the unit pixel of the measured value of the pixel value needs to estimate and read the start point and the end point of the light spot straight line, and regards the estimated and read result as a complete unit pixel. At this time, a theoretical error of at most two unit pixels exists, and the smaller the actual physical size a corresponding to a unit pixel is, the smaller the theoretical error caused by two unit pixels is.
In an embodiment, in the step six S600, when the difference between the actual physical size B corresponding to the unit light spot and the set physical size C corresponding to the unit light spot is not greater than 1% of the set physical size C corresponding to the unit light spot, it is determined that the actual physical size B corresponding to the unit light spot matches the set physical size C corresponding to the unit light spot.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the specification and drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.
Claims (10)
1. An opto-mechanical correction system for a 3D printing device, the opto-mechanical correction system comprising:
the optical machine is positioned below the printing platform, the moving device is positioned above the printing platform, the moving device can move up and down relative to the printing platform, and the moving device can be used for installing a forming platform of the 3D printing equipment;
the adjusting device is detachably connected to the moving device;
the camera device is arranged on the adjusting device and comprises a camera, and a lens of the camera faces the printing platform; the adjusting device is used for driving the camera to move horizontally or lift, and the camera is used for shooting actual patterns projected to the printing platform by the optical machine;
and the image processing device is in communication connection with the camera and is used for acquiring the number of light spots and pixel values in a picture shot by the camera.
2. The optical-mechanical calibration system for 3D printing equipment as claimed in claim 1, wherein said camera device further comprises a telecentric lens, said telecentric lens is installed at the lens of said camera and is extended towards said printing platform, and a UV light filtering layer is disposed on one side of said telecentric lens towards said printing platform.
3. The optical machine calibration system for 3D printing equipment according to claim 1, wherein the adjusting device comprises a first switching part, an adjusting part and a second switching part which are sequentially connected, the first switching part is used for connecting the moving device, the second switching part is used for connecting the camera device, the adjusting part comprises a first sliding table and a second sliding table which are arranged in a stacked manner, the first sliding table is used for driving the camera device to move vertically or horizontally, and the second sliding table is used for driving the camera device to move vertically.
4. The optical machine calibration system for 3D printing equipment, according to claim 3, wherein the first sliding table comprises a first sliding plate, a second sliding plate and a third sliding plate which are arranged in a stacked manner, a transverse adjusting knob for connecting the first sliding plate and the second sliding plate, and a vertical adjusting knob for connecting the second sliding plate and the third sliding plate, the first sliding plate is connected with the first transfer portion, the transverse adjusting knob is used for driving the second sliding plate to move transversely relative to the first sliding plate, and the vertical adjusting knob is used for driving the third sliding plate to move vertically relative to the second sliding plate.
5. An opto-mechanical correction method based on the opto-mechanical correction system for 3D printing equipment according to any of claims 1 to 4, characterized by comprising the following steps:
the method comprises the following steps: acquiring an actual physical size A corresponding to a unit pixel in a photo shot by the camera device in a focusing manner;
step two: adjusting the mobile device to enable the camera device to be focused on the printing platform;
step three: adjusting the optical machine to focus the pattern projected by the optical machine on the printing platform;
step four: adjusting the adjusting device to enable the camera device to focus on the actual pattern projected onto the printing platform and shoot;
step five: acquiring a pixel value corresponding to a single light spot in the shot actual pattern photo through the image processing device, and combining an actual physical size A corresponding to the single pixel in the step one to obtain an actual physical size B corresponding to the single light spot in the shot actual pattern photo; if the actual physical size B corresponding to the unit light spot is smaller than the set physical size C corresponding to the unit light spot, the distance between the optical machine and the printing platform is adjusted to be far; if the actual physical size B corresponding to the unit light spot is larger than the set physical size C corresponding to the unit light spot, the distance between the optical machine and the printing platform is adjusted to be close;
step six: and repeating the third step to the fifth step until the actual physical size B corresponding to the unit light spot is consistent with the set physical size C corresponding to the unit light spot.
6. The optical-mechanical correction method of the optical-mechanical correction system for 3D printing equipment according to claim 5, wherein the step of obtaining the actual physical dimension a corresponding to a unit pixel in the photograph taken by the camera in focus specifically comprises:
focusing and shooting a standard sample piece with the length of D by using the camera device;
acquiring a pixel value E corresponding to the length of a standard sample in a shot standard sample photo through the image processing device;
and calculating the actual physical size A = D/E corresponding to the unit pixel.
7. The optical-mechanical calibration method of the optical-mechanical calibration system for the 3D printing apparatus according to claim 5, wherein the resolution of the optical-mechanical calibration system is F, the actual pattern size projected by the optical-mechanical calibration system onto the printing platform at a set distance is H, and the set physical size corresponding to a unit spot is C = H/F.
8. The optical-mechanical correction method of the optical-mechanical correction system for the 3D printing apparatus according to claim 5, wherein in the fifth step, the process of obtaining the actual physical dimension B corresponding to the unit light spot in the shot actual pattern photo specifically includes:
acquiring the number X of light spots on any straight line and a pixel value Y corresponding to the straight line in a shot actual pattern photo through the image processing device;
and calculating the actual physical size B = (Y × A/X) corresponding to the unit light spot.
9. The opto-mechanical calibration method for the opto-mechanical calibration system of 3D printing equipment according to claim 8, wherein in the step of obtaining the pixel value Y corresponding to the straight line, the start point and the end point of the straight line are regarded as a complete unit pixel.
10. The optical-mechanical calibration method of the optical-mechanical calibration system for the 3D printing apparatus according to claim 5, wherein in the sixth step, when the difference between the actual physical dimension B corresponding to the unit light spot and the set physical dimension C corresponding to the unit light spot is not greater than 1% of the set physical dimension C corresponding to the unit light spot, it is determined that the actual physical dimension B corresponding to the unit light spot matches the set physical dimension C corresponding to the unit light spot.
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