CN212555058U - Brightness detection jig and 3D printing equipment - Google Patents

Abstract

The application discloses luminance detection tool and 3D printing apparatus. The brightness detection jig comprises a detection plate and a first measuring device, wherein a plurality of light transmission groups are arranged on the detection plate; each light transmission group comprises at least one light transmission part; the first measuring device is movably arranged on the upper surface of the detection plate, the lower surface of the first measuring device is provided with a plurality of light intensity detection elements corresponding to at least one light transmission group, and the light intensity detection elements traverse each light transmission part under the moving state to detect the light brightness transmitted from each light transmission part, so that the light brightness transmitted from the light transmission holes at different positions of the energy radiated by the energy radiation device is detected, the intensity of the energy radiated by the energy radiation device at different positions is obtained, and data support is provided for calibration of the energy radiation device. Moreover, the first measuring device can detect the brightness of the light rays transmitted out of the light transmitting parts at one detection position, and the detection efficiency is effectively improved.

Description

Brightness detection jig and 3D printing equipment

Technical Field

The application relates to the technical field of 3D printing, especially, relate to a luminance detection tool and 3D printing apparatus.

Background

In the 3D printing process, an energy radiation device of the 3D printing equipment radiates energy to the printing and forming surface to form the material to be solidified on the printing and forming surface. During this period, if the intensity distribution of the energy radiated by the energy radiation device is not uniform, the curing effect of different areas on the printed member is not uniform, and the quality of the printed member is affected. For this reason, it is necessary to calibrate the energy radiation system so that the energy intensity distribution radiated therefrom is uniform, however, there is a lack of a scheme for effectively detecting the energy intensity radiated from the energy radiation device in each direction, so that the calibration work is difficult.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks of the related art, an object of the present invention is to provide a brightness detection fixture for overcoming the technical problems of the related art that the intensity distribution of the energy radiated by the energy radiation device cannot be detected.

To achieve the above and other related objects, a first aspect of the disclosure provides a brightness detection fixture, including: the detection plate is provided with a plurality of light-transmitting groups for transmitting light; wherein, each light transmission group comprises at least one light transmission part; and the second side surface of the first measuring device is provided with a plurality of light intensity detecting elements corresponding to at least one light transmitting group so as to traverse each light transmitting part in a moving state to detect the brightness of light transmitted from each light transmitting part.

In certain embodiments of the first aspect of the present application, the brightness detection jig further includes a guide rail located on one side or opposite sides of the first side surface of the detection plate; wherein the first measuring device is provided on the guide rail to traverse each light-transmitting portion in a process of moving along the guide rail.

In certain embodiments of the first aspect of the present application, the detection plate further defines a central light-transmitting portion at a center thereof.

In certain embodiments of the first aspect of the present application, the brightness detection fixture further includes a second measuring device for detecting the brightness of the light passing through the central light-transmitting portion.

In certain embodiments of the first aspect of the present application, the detection plate is further provided with a centering structure for positioning the second measuring device.

In certain embodiments of the first aspect of the present application, the detection plate further has a plurality of positioning holes formed thereon for determining a positional relationship between the detection plate and the projected pattern of the light source.

In certain embodiments of the first aspect of the present application, the light-transmitting portions are arranged in an array on the detection plate and each row of light-transmitting portions is defined as a light-transmitting group, and the plurality of light intensity detection elements of the first measurement device corresponds to at least one of the position and the number of the light-transmitting groups.

In certain embodiments of the first aspect of the present application, the detection board is provided with a positioning mark for indicating the detection position of each light-transmitting group, or the detection board and the first measurement device are provided with corresponding positioning marks for indicating the detection position of each light-transmitting group.

In certain embodiments of the first aspect of the present application, the detection plate and the first measuring device are provided with corresponding positioning mechanisms for positioning to the detection position of each light transmission group during traversal of the light transmission portions by the first measuring device.

In certain embodiments of the first aspect of the present application, the positioning mechanism comprises: the positioning grooves are arranged on the detection plate and correspond to the detection positions of the light transmission groups; and the positioning pin is arranged on the first measuring device and sequentially falls into the positioning groove in the process that the first measuring device traverses all the light transmission parts.

A second aspect of the present disclosure provides a 3D printing apparatus including: a container for holding a photocurable material to be cured; the energy radiation system is arranged at a preset position on one side of the top or the bottom of the container and is configured to radiate energy to a printing reference surface in the container through a control program when a printing instruction is received so as to cure the light-cured material on the printing reference surface; a member stage, located in the container in a printing state, for attaching a cured layer obtained after energy radiation so as to form a printing member by accumulation of the cured layer; a Z-axis driving mechanism connected with the component platform and configured to adjust the distance between the component plate and the bottom surface of the container according to a printing instruction so as to fill the photo-curing material to be cured; the brightness detection jig according to any one of the embodiments of the first aspect of the present disclosure is configured to detect brightness of different areas in a radiation surface of the energy radiation device during calibration operation; and the control device is electrically connected with the energy radiation system and the Z-axis driving mechanism and is used for enabling the energy radiation system and the Z-axis driving mechanism to cooperatively work to print the 3D component.

In summary, the first measuring device in the present application may traverse each light-transmitting portion on the detection plate in a moving state, so as to detect the brightness of light transmitted from the light-transmitting holes at different positions by the energy radiated by the energy radiation device, thereby obtaining the intensities of the energy radiated by the energy radiation device at different positions, and providing data support for calibration of the energy radiation device. Moreover, the first measuring device can detect the brightness of the light rays transmitted out of the light transmitting parts at one detection position, and the detection efficiency is effectively improved.

Other aspects and advantages of the present application will be readily apparent to those skilled in the art from the following detailed description. Only exemplary embodiments of the present application have been shown and described in the following detailed description. As those skilled in the art will recognize, the disclosure of the present application enables those skilled in the art to make changes to the specific embodiments disclosed without departing from the spirit and scope of the invention as it is directed to the present application. Accordingly, the descriptions in the drawings and the specification of the present application are illustrative only and not limiting.

Drawings

The specific features of the invention to which this application relates are set forth in the appended claims. The features and advantages of the invention to which this application relates will be better understood by reference to the exemplary embodiments described in detail below and the accompanying drawings. The brief description of the drawings is as follows:

fig. 1 is a schematic structural diagram of a brightness detection fixture according to an embodiment of the present disclosure.

Fig. 2a is a schematic structural diagram of a detection board in an embodiment of the present application.

Fig. 2b shows a schematic view of the structure of the detection plate in another embodiment of the present application.

Fig. 2c shows a schematic structural diagram of a detection board in the present application in a further embodiment.

Fig. 3a is a schematic view showing an embodiment of the present application in which a positioning mark is disposed on a detection board.

Fig. 3b shows a schematic view of another embodiment of the present application in which a positioning mark is arranged on the detection plate.

Fig. 4 is a schematic structural diagram of a first measurement device in an embodiment of the present application.

Fig. 5 is a schematic view of a connection structure of a first measuring device and a detection plate in an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a detection plate in the present application in a further embodiment.

Fig. 7 is a schematic structural diagram of a second measuring device in the present application in one embodiment.

Fig. 8 is a schematic structural diagram of a 3D printing apparatus according to an embodiment of the present disclosure.

Detailed Description

The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.

In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.

Although the terms first, second, etc. may be used herein to describe various elements or parameters in some instances, these elements or parameters should not be limited by these terms. These terms are only used to distinguish one element or parameter from another element or parameter. For example, a first measurement device may be referred to as a second measurement device, and similarly, a second measurement device may be referred to as a first measurement device, without departing from the scope of the various described embodiments. The first and second measuring devices are both described as one measuring device, but they are not the same measuring device unless the context clearly dictates otherwise.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

As described in the background art, in the 3D printing process, the energy radiation device of the 3D printing apparatus forms the material to be cured on the print forming surface by radiating energy to the print forming surface. The uneven distribution of the energy intensity radiated by the energy radiation device can cause the inconsistent curing effect of different areas on the printed component, thereby affecting the quality of the printed component. In the case of the energy radiation device based on the surface exposure, in the radiation surface projected by the energy radiation device based on the surface exposure, generally, the brightness value of the center of the radiation surface is higher, and the brightness value of the edge of the radiation surface is lower, so that the intensity distribution of the energy radiated by the energy radiation device is not uniform, and the degree of curing of the printed member is also not uniform. Therefore, it is necessary to calibrate the energy radiation system so that the intensity distribution of the energy radiated therefrom is uniform.

For this reason, it is necessary to acquire light intensity data of each position in the radiation surface of the energy radiation system, in order to correct the energy radiation device of the 3D printing apparatus using the light intensity data so that the intensity of the radiation surface thereof maintains uniformity.

In view of this, the present application provides a brightness detection fixture for detecting brightness of each region in a projection pattern projected by a light source, so as to detect output power of each region on a projection surface of an optical machine.

The optical machine can be an energy radiation device based on surface exposure in the 3D printing equipment, and the energy radiation device based on surface exposure is a DLP optical machine and an LCD screen; other projection devices are also possible, such as a projector or the like.

In an exemplary embodiment, please refer to fig. 1, which is a schematic structural diagram of a brightness detection fixture according to an embodiment of the present application. As shown in the figure, the brightness detection jig comprises: a detection plate 11 and a first measuring device 12.

The detection plate 11 is provided with a plurality of light-transmitting portions 1111 for transmitting light, wherein one or more light-transmitting portions 1111 form a light-transmitting group, so that a plurality of light-transmitting groups are formed on the detection plate, and the number of the light-transmitting portions 1111 in each group is equal. When the detection plate 11 is placed in the projection direction of the light source, the light-transmitting portion 1111 transmits light projected by the light source. The first measuring device 12 is movably arranged at a first side of the detection plate 11, i.e. the first measuring device 12 is movable relative to the detection plate 11. The second side surface of the first measuring device 12 is provided with a plurality of light intensity detecting elements corresponding to at least one light transmitting group, that is, the number of the light intensity detecting elements is at least equal to the number of the light transmitting portions 1111 of one light transmitting group, so that the brightness of the light transmitted from the light transmitting portions of the detecting plate 11 is detected in a state where the first measuring device 12 moves along the first side surface of the detecting plate 11. The light intensity detecting element includes, for example, a light intensity detector or a photosensor. In the embodiment, for the convenience of understanding, one side surface of the upper surface of the detection plate 11 is a first side surface; a side surface of the lower surface of the detection plate 11 is a second side surface.

In one embodiment, please refer to fig. 2a, which is a schematic structural diagram of a detection board in the present application in one embodiment. As shown in the drawing, in the present embodiment, the light-transmitting portion 1111 is a through hole, and the shape of each through hole may be a circle as shown in the drawing, or may be any shape such as a square, a triangle, or another polygon.

In another embodiment, please refer to fig. 2b, which is a schematic structural diagram of a detection board in the present application in another embodiment. As shown in the figure, in the embodiment, the light-transmitting portion 1111 has a strip-shaped hollow structure.

In yet another embodiment, please refer to fig. 2c, which is a schematic structural diagram of a detection board in the present application in yet another embodiment. As shown in the figure, in this embodiment, the light-transmitting portion 1111 may further include strip-shaped hollow structures located at two sides and a square hollow structure located between the strip-shaped hollow structures at the two sides.

Here, the shape and arrangement of the light-transmitting portion may be configured according to practical application, as long as light capable of transmitting the projection pattern projected by the light source at a plurality of different positions may be applied to the present application.

In an exemplary embodiment, the plurality of light transmission groups are arranged on the detection plate in an array form, each row of light transmission parts is defined as one group, and the plurality of light intensity detection elements of the first measurement device correspond to at least the position and the number of the light transmission parts in one light transmission group.

Continuing with fig. 2a as an example, in the embodiment shown in fig. 2a, 4 through holes in the same column form a light-transmitting group 111. The number of light intensity detecting elements and the positions of the light intensity detecting elements on the first measuring device at least correspond to the number and positions of the light transmitting portions 1111 in one light transmitting group. Of course, the number of the light intensity detecting elements and the positions of the light intensity detecting elements on the first measuring device may also correspond to the number and positions of the light transmitting portions in the plurality of light transmitting groups, for example, in the example of fig. 2a, the number of the light intensity detecting elements may also be 8, 12, 16, 20 or 24, so as to detect the brightness of the light transmitted by the light transmitting portions 1111 in the plurality of rows at the same position.

It should be noted that, although the vertical rows are shown as a column in the present embodiment, in practical applications, depending on the defined direction, a horizontal row may be defined as a column to form a light-transmitting group, for example, in the example corresponding to fig. 2a, 6 horizontal through holes may be defined as a light-transmitting group. In addition, the number of the light-transmitting portions in the longitudinal and transverse directions of the array may also be configured according to actual requirements, in other words, those skilled in the art will know that the number of the light-transmitting holes or the light intensity detecting elements may be adaptively adjusted and changed according to the actual structure or the size of the detecting plate, and is not limited herein.

In an exemplary embodiment, in order to enable the first measuring device to be accurately positioned to each detection position to detect the brightness of the light transmitted through each light transmitting portion, the brightness detection jig is further provided with a positioning mark or a positioning mechanism.

In one embodiment, please refer to fig. 3a, which shows a schematic diagram of an embodiment of the present application in which a positioning mark is configured on a detection board. As shown, a positioning mark 117, i.e., a positioning mark line indicated by a dotted line in the figure, is provided on the detection plate corresponding to each detection position. In this embodiment, during the movement of the first measuring device, the left side contour line of the first measuring device may be aligned with each positioning mark line to position the first measuring device to each detection position, and when the first measuring device moves to each detection position, each light intensity measuring element in the first measuring device corresponds to each light transmission portion position one to one, thereby detecting the brightness of the light transmitted from the light transmission portion of the detection plate 11. Of course, the locating mark line may also be presented in other forms or arranged in alignment with the right side contour line or other locations of the first measuring device.

In another embodiment, please refer to fig. 3b, which shows a schematic diagram of another embodiment of the present application in which a positioning mark is configured on a detection board. As shown, a positioning mark 117, i.e. a positioning mark line and a positioning mark arrow, as indicated by the dashed line in the figure, is provided on both the detection plate and the first measuring device. In this embodiment, during the movement of the first measuring device, the positioning mark arrows on the first measuring device may be aligned with the positioning mark lines to position the first measuring device to each detection position, and when the first measuring device moves to each detection position, the light intensity measuring elements in the first measuring device correspond to the light transmission portions one by one, so as to detect the brightness of the light transmitted through the light transmission portion of the detection plate 11. Of course, the positioning identification lines and the positioning identification arrows may also be present in other forms or arranged at other locations of the detection plate and the first measuring device.

In another embodiment, in order to improve the positioning efficiency and convenience, the detection plate and the first measuring device are provided with corresponding positioning mechanisms for positioning to the detection position of each light transmission group in the process that the first measuring device traverses each light transmission part. In the process that the first measuring device moves along the detection plate, the positioning mechanism on the first measuring device generates a limiting effect due to the acting force between structures when contacting the positioning mechanism on the detection plate so as to prompt an operator of the detection position of the first measuring device on the detection plate.

Referring to fig. 2a in conjunction with fig. 4, fig. 4 is a schematic structural diagram of a first measurement device according to an embodiment of the present disclosure. As shown in fig. 2a, a positioning groove 115 is formed on the detection plate corresponding to each light-transmitting set 111, so that a plurality of positioning grooves are formed on the detection plate; as shown in fig. 4, a positioning pin 125 is disposed on the first measuring device 12. And in the process that the first measuring device traverses all the light transmission parts, the positioning pins on the first measuring device sequentially fall into all the positioning grooves. When the first measuring device is moved to each detection position, each light intensity measuring element in the first measuring device corresponds to each light transmission portion position one by one, thereby detecting the brightness of the light transmitted from the light transmission portion of the detection plate 11.

The positioning pin may be a spring pin, or a material that can deform under manual force, such as a polymer material. When the positioning pin is a spring pin, after the positioning pin falls into the positioning groove, the spring is urged to contract to enable the positioning pin to leave from the positioning groove and move to the next detection position along the moving direction by applying force to the moving direction; when the positioning pin is made of high polymer materials, after the positioning pin falls into the positioning groove, the positioning pin is forced to deform in the moving direction so as to enable the positioning pin to leave from the positioning groove and move to the next detection position along the moving direction.

In practical application, according to specific needs, a plurality of positioning pins may be disposed on the detection plate corresponding to the detection positions, and a positioning groove is disposed on the first measurement device to achieve the same or similar technical effects, which is not described herein again.

In another embodiment, a positioning block is disposed on the detection plate corresponding to each light-transmitting set, the positioning block is a convex structure formed on the surface of the detection plate, so that a plurality of positioning blocks are formed on the detection plate, and a positioning pin is disposed on the first measuring device. When the first measuring device moves to a detection position, each light intensity measuring element in the first measuring device corresponds to each light transmission part corresponding to the detection position one by one, and therefore the brightness of light rays transmitted through each light transmission part of the detection plate is detected. After the detection is finished, the positioning pins on the first measuring device are forced to pass over the positioning blocks to move to the next detection position by applying force to the moving direction.

The positioning pin may be a spring pin, or a material that can deform under manual force, such as a polymer material. When the positioning pin is a spring pin, after the positioning pin touches the positioning block, the positioning pin is firstly subjected to the blocking force of the positioning block to the positioning block, namely the arrival of the positioning pin at a detection position is prompted, and after the detection is finished, the spring is prompted to contract by applying force to the moving direction, so that the spring can cross the positioning block and move to the next detection position along the moving direction; when the positioning pin is made of a high polymer material, after the positioning pin touches the positioning block, the positioning pin is firstly subjected to a blocking force of the positioning block to the positioning block, namely, the detection position is prompted to be reached, and after the detection is finished, the positioning pin is forced to deform to cross the positioning block and move to the next detection position along the moving direction by applying force to the moving direction.

In order to ensure the fit between the positioning block and the positioning pin, the positioning block should be arranged at a height that matches the amount of height deformation that can be produced by the positioning pin. For example, when the positioning pin is a spring pin, the positioning block is not set to a height higher than the amount of deformation that the spring can produce; when the locating pin is macromolecular material, the setting height of locating piece should not be higher than the deformation volume that the locating pin body can produce when receiving the manpower action.

In an exemplary embodiment, to provide a moving path of the first measuring device on the detection plate, the brightness detection jig further includes a guide rail.

Referring to fig. 1, a guide rail 13 is disposed on a first side surface of the detecting plate 11. The guide rail 13 includes a rail attached to a first side surface of the detection plate 11, and a slider provided on the rail. The first measuring device is mounted on the slide so as to be slidable on the rail by means of the slide for movement over the detection plate. The guide rails can also be arranged on two opposite sides of the first side surface of the detection plate, and two ends of the first measuring device are respectively connected with the guide rails on the two sides. During the movement of the first measuring device along the guide rail, the plurality of light intensity detecting elements on the first measuring device traverse the light transmitting portions to detect the brightness of the light transmitted through the light transmitting portions. In a possible embodiment, to facilitate limiting the stroke range of the first measuring device, a limiting mechanism 116 is further disposed on the detection plate on both sides of the stroke range of the first measuring device, and the limiting mechanism includes, but is not limited to, a bump or a limiting pin.

In another exemplary embodiment, both ends of the first measuring device have connecting portions movably fixed to the detection plate. Please refer to fig. 5, which is a schematic diagram illustrating a connection structure between a first measuring device and a detecting board according to an embodiment of the present disclosure. As shown in the figure, the first measuring device 12 includes a body 122 and connecting portions 123 located at two sides of the lower portion of the body, and the detecting plate 11 is clamped in a gap between the connecting portions 123 and the body 122. Therefore, the first measuring device 12 can move along the first side surface of the detecting plate 11 and is limited by the connecting portion 123, so that in the process that the first measuring device moves along the first side surface of the detecting plate 11, the light intensity detecting elements on the first measuring device can be aligned with the corresponding light transmitting portions when reaching the corresponding detecting positions, and the light transmitting portions are traversed to detect the brightness of the light transmitted from the light transmitting portions.

In an exemplary embodiment, please refer to fig. 6, which is a schematic structural diagram of a detection board in another embodiment of the present application. As shown in the figure, in order to detect the brightness of the central point of the light source, the center of the detection plate 11 is further provided with a central light-transmitting portion 112.

Here, in order to detect the light transmitted through the central transparent portion 112, in one embodiment, a light intensity detecting element corresponding to the central transparent portion 112 may be disposed at a corresponding position on the first measuring device. In another embodiment, since the number of light intensity detecting elements that can be mounted on the first measuring device is limited, a second measuring device can be separately configured to separately detect each light-transmitting portion 1111 from the central light-transmitting portion 112. For example, after the first measuring device traverses the other light-transmitting portions 1111, the second measuring device may detect the brightness of the light transmitted through the central light-transmitting portion 112. Alternatively, the brightness of the light transmitted through the central light-transmitting portion 112 may be detected by the second measuring device, and then the first measuring device may traverse the other light-transmitting portions 1111 to detect the brightness of the light transmitted through each light-transmitting portion 1111.

In an exemplary embodiment, in order to accurately position the detection plate to the detection position corresponding to the central light-transmitting portion, a center positioning structure for positioning the second measuring device is further provided on the detection plate.

In one embodiment, please refer to fig. 7 in combination with fig. 6, wherein fig. 7 is a schematic structural diagram of a second measurement device in the present application in one embodiment. As shown in fig. 7, the second measuring device 14 includes a case 124 and a light intensity detecting element 121, and as shown in fig. 6, a positioning groove 113 corresponding to the contour of the case of the second measuring device 14 is provided at the center of the first side surface of the detection plate 11. When the brightness of the light transmitted through the central light-transmitting portion is detected, the second detecting device 14 is placed in the positioning slot 113 and the light intensity detecting element 121 of the second detecting device 14 is placed toward the detecting plate, so that the light intensity detecting element 121 can be aligned with the central light-transmitting portion of the detecting plate to detect the brightness of the light transmitted through the central light-transmitting portion.

It should be understood that the positioning groove is only one implementation manner of the centering structure, and in practical applications, the centering structure may be configured in other forms according to practical requirements. For example, at least one bump or mark for indicating the placing position of the second measuring device is arranged on the edge of the detecting plate corresponding to the placing position of the second measuring device (i.e. the detecting position of the central light-transmitting part).

In some cases, when the brightness of each light ray in the projection pattern projected by the light source is detected using the brightness detection jig, the positional relationship between the detection plate and the projection pattern projected by the light source is first determined.

For this purpose, in a possible embodiment, as shown in fig. 2a and 6, the detection plate is further provided with a plurality of positioning holes 114 for determining a positional relationship between the detection plate and the projected pattern of the light source. Before the brightness of the light transmitted through each light transmitting part on the detection plate is detected, firstly, the light source projects a calibration pattern, and whether the projected patterns projected by the detection plate and the light source are in an ideal position relationship is verified through the plurality of positioning holes 114. The calibration pattern may include, for example, calibration points corresponding to the number and positions of the positioning holes 114, when the light source projects the calibration pattern toward the detection plate, if each calibration point in the calibration pattern passes through each positioning hole, it indicates that the projected patterns projected by the detection plate and the light source are in an ideal position relationship, otherwise (i.e., if the calibration point is blocked by the detection plate and cannot pass through the positioning point), the positions of the light source and/or the detection plate are adjusted so that each calibration point in the calibration pattern passes through each positioning hole.

In a possible embodiment, the light intensity detection element may detect or visually determine whether each of the calibration points in the calibration pattern passes through each of the positioning holes. When determining whether each calibration point in the calibration pattern penetrates through each positioning hole in a visual inspection mode, a semi-euphotic layer can be arranged at the bottom of each positioning hole to reduce the stimulation of a light source to eyes. Examples of the semi-light-transmitting layer include a semi-light-transmitting film, paper, or the like.

In an embodiment of the present application, please continue to refer to fig. 1, taking the example that the brightness detection fixture is applied to a 3D printing apparatus, first, the brightness detection fixture is fixed on the 3D printing apparatus, for example, placed on a workpiece platform of the 3D printing apparatus, and the light source projects a calibration image having calibration points corresponding to the number and positions of the positioning holes 114 on the detection plate 11, and the position relationship between the projection patterns of the detection plate and the light source is determined by whether each calibration point penetrates through each positioning hole 114. If the calibration points do not pass through the positioning holes 114, the projection direction of the light source or the position of the brightness detection tool is adjusted so that the calibration points pass through the positioning holes 114. Then, the operator can be prompted to reach the detection position through the positioning groove 115 at each detection position during the movement by moving the first measuring device 12 to the detection position corresponding to each light transmission group through the guide rail 13 to traverse each light transmission part, and after the detection work of the current detection position is completed, the first measuring device 12 is continuously moved to the next detection position to detect the brightness of the light transmitted from the light transmission part 1111 of the detection plate. As shown in fig. 1, a central light-transmitting portion 112 is further formed at the center of the detecting plate 11, and the brightness of the light transmitted through the central light-transmitting portion 112 is measured by a second measuring device and is positioned by a positioning groove 113, which is a central positioning structure.

In summary, the first measuring device in the present application may traverse each light-transmitting portion on the detection plate in a moving state, so as to detect the brightness of light transmitted from the light-transmitting holes at different positions by the energy radiated by the energy radiation device, thereby obtaining the intensities of the energy radiated by the energy radiation device at different positions, and providing data support for calibration of the energy radiation device. Moreover, the first measuring device can detect the brightness of the light rays transmitted out of the light transmitting parts at one detection position, and the detection efficiency is effectively improved.

The second aspect of the present application also provides a 3D printing apparatus.

In an exemplary embodiment, please refer to fig. 8, which is a schematic structural diagram of a 3D printing apparatus according to an embodiment of the present application. As shown, the 3D printing apparatus includes: a container 31, an energy radiation system 32, a component platform 34, a Z-axis driving mechanism 35, a brightness detection tool (not shown), and a control device 33.

Wherein the container 31 has a transparent bottom for containing the light curing material to be cured. The photocurable material includes any liquid material susceptible to photocuring, examples of which include: a photocurable resin liquid, or a resin liquid doped with a mixed material such as ceramic powder or a color additive. The container 31 may be transparent as a whole or only the bottom of the container, for example, the container 31 is a glass container 31, and the wall of the container 31 is adhered with light absorbing paper (such as black film, black paper, etc.) so as to reduce the interference of light curing material curing due to light scattering during projection. The bottom surface of the container can be paved with a transparent flexible film which is a release film and is convenient to separate.

In one embodiment, the component platform comprises a component plate, and a plurality of through holes are formed in the component plate to allow the light-cured material to pass through during a printing operation of the 3D printing device, so that the light-cured material in the container has good fluidity during the printing process to ensure the printing quality.

The component plate is located in the container 31 in a printing state, and is driven by the Z-axis driving mechanism 35 to perform lifting movement, during which the solidified layer is separated from the bottom surface of the container 31, and the space between the solidified layer and the bottom surface of the container 31 is filled with the light-curing material, so that the solidified layer obtained after energy radiation is attached under the cooperation of the energy radiation system, so as to form a printing component through accumulation of the solidified layer.

The energy radiation system 32 is located below the container 31 and irradiates light energy to the bottom surface, and is used for irradiating the received layered image to the printing reference surface of the container 31 through a control program when receiving a printing instruction so as to cure the light-curing material on the printing reference surface, and obtain a corresponding pattern curing layer. Of course, in some embodiments, the energy radiation system may also be located above the container and irradiate light energy toward the bottom surface.

The structure of the energy radiation system 32 is determined according to the type of the 3D printing apparatus.

In an embodiment, the 3D printing device may be a bottom projection or bottom exposure 3D printing device, for example, a DLP (Digital Light processing) device that performs surface exposure by a top or bottom projector, or an LCD device that performs surface exposure by a top projector. And the energy radiation system of the 3D printing device is positioned on the bottom surface of the container and irradiates towards the bottom surface of the container, and is used for irradiating layered images in the 3D component model onto a printing reference surface formed by the gap between the component plate and the bottom of the container so as to cure the light curing material into a corresponding pattern curing layer.

When the 3D printing device is used for printing an object, the energy radiation system irradiates the light-cured material at the bottom of the container to form a first cured layer, the first cured layer is attached to a component plate, the component plate is driven by a Z-axis driving mechanism to move upwards so that the cured layer is separated from the bottom of the container, then the component plate is descended so that the light-cured material to be cured is filled between the bottom of the container and the first cured layer, the light-cured material is irradiated again to obtain a second cured layer attached to the first cured layer, and the like, and the cured layers are accumulated on the component plate through multiple filling, irradiating and separating operations to obtain the 3D object. For 3D printing equipment for manufacturing a 3D object by using a light-cured material in a bottom surface exposure mode, in the printing process, a layer-by-layer printing mode is adopted, and each printing layer is peeled from the bottom of a container after being cured. When a solidified layer is formed, the upper and second side surfaces of the solidified layer are respectively attached to the component plate and the bottom of the container, generally, the adhesion force between the 3D object and the bottom of the container is strong, and a large pulling force needs to be overcome in the process that the solidified layer is driven by the component plate to rise to realize peeling, and the risk that the solidified layer is damaged is also accompanied. Therefore, it is common to reduce the adhesive force to be overcome by covering the bottom of the container with a release film.

In the DLP device, the energy radiation system includes a DMD chip, a controller, and a memory module, for example. Wherein the storage module stores therein a layered image layering the 3D component model. And the DMD chip irradiates the light source of each pixel on the corresponding layered image to the top surface of the container after receiving the control signal of the controller. In fact, the mirror is composed of hundreds of thousands or even millions of micromirrors, each micromirror represents a pixel, and the projected image is composed of these pixels. The DMD chip may be simply described as a semiconductor light switch and a micromirror plate corresponding to the pixel points, and the controller allows/prohibits the light reflected from each of the micromirrors by controlling each of the light switches in the DMD chip, thereby irradiating the corresponding layered image onto the photo-curable material through the transparent top of the container so that the photo-curable material corresponding to the shape of the image is cured to obtain the patterned cured layer.

In the LCD printing apparatus, the energy radiation device is an LCD liquid crystal panel light source system. The LCD printing device comprises an LCD liquid crystal screen and a light source, wherein the LCD liquid crystal screen is positioned above the container, and the light source is aligned above the LCD liquid crystal screen. And a control chip in the energy radiation device projects the layered image of the slice to be printed to a printing surface through an LCD (liquid crystal display), and the material to be solidified in the container is solidified into a corresponding pattern solidified layer by using a pattern radiation surface provided by the LCD.

Since the energy radiation device radiates energy, the energy reaching each position on the component plate may be different, particularly for the energy radiation device for the area exposure. Therefore, the energy radiation device can be calibrated by detecting the energy of the energy radiated by the energy radiation device at each position on the component plate through the brightness detection jig, so that the energy projected by the calibrated energy radiation device is uniform.

The specific structure of the brightness detection fixture is substantially the same as that of the brightness detection fixture in the embodiment corresponding to fig. 1 to 7, and therefore, the technical features of the embodiment can be applied to this embodiment, and the detailed description of the described technical details is not repeated.

The brightness detection jig is configured to be placed on the component platform in a calibration operation of the 3D printing device, the energy radiation device projects a calibration image with calibration points corresponding to the number and the positions of the positioning holes in the detection plate of the brightness detection jig, and the position relation between the projection patterns of the detection plate and the energy radiation device is determined according to whether the calibration points penetrate through the positioning holes. If the calibration points do not penetrate through the positioning holes, the projection direction of the energy radiation device or the position of the brightness detection jig is adjusted so that the calibration points penetrate through the positioning holes. Then, the first measuring device of the brightness detection jig is moved to the detection position corresponding to each light transmission group through the guide rail to enable the first measuring device to traverse each light transmission part, an operator can be prompted to reach the detection position through the positioning groove at each detection position in the moving process, and after the detection work of the current detection position is completed, the first measuring device is continuously moved to the next detection position to detect the brightness of the light transmitted from the light transmission part of the detection plate. And in the non-calibration operation, the brightness detection jig is taken down from the component platform so as to facilitate the printing operation.

The Z-axis driving mechanism 35 is connected to the component platform 34 for controlling the component platform 34 to move up and down so that the space between the component platform 34 and the container 31 is filled with the light-curing material.

Here, the Z-axis drive mechanism 35 includes a drive unit and a connection unit. The driving unit is exemplified by a driving motor, wherein the driving motor is exemplified by a servo motor, the servo motor selects forward rotation or reverse rotation to control lifting based on the received control instruction, and drives the connecting unit to move up and down according to the rotating speed/rotating acceleration/torsion and the like indicated by the control instruction. Wherein the control instruction comprises a lifting direction and specific operation parameters. The operating parameters are, for example, parameters such as rotation speed, rotational acceleration or torque.

The connection unit includes a fixed rod with one end fixed on the component platform 34, and an engagement moving assembly fixed with the other end of the fixed rod, wherein the engagement moving assembly is driven by the driving unit to drive the fixed rod to move vertically, and the engagement moving assembly is, for example, a limit moving assembly engaged by a tooth-shaped structure, such as a rack. As another example, the connection unit includes: a screw and a positioning and moving structure screwed on the screw, wherein both ends of the screw are screwed on the driving unit, the outer end of the positioning and moving structure is fixedly connected to the component platform 34, and the positioning and moving structure can comprise a nut-shaped structure of a ball and a clamping piece.

The control device 33 is electrically connected to the Z-axis driving mechanism 35 and the energy radiation system 32, respectively, and is configured to control the Z-axis driving mechanism 35 and the energy radiation system 32 to print a 3D component.

Here, the control device 33 is exemplified by a computer device, an industrial personal computer including a CPU or an MCU, or an electronic device based on an embedded operating system.

In a possible embodiment, the device comprises a storage unit, a processing unit, and an interface unit.

Wherein, the memory unit comprises nonvolatile memory, volatile memory and the like. The nonvolatile memory is, for example, a solid state disk or a usb disk. The storage unit is connected with the processing unit through a system bus. The processing unit comprises at least one of a CPU or a chip integrated with the CPU, a programmable logic device (FPGA) and a multi-core processor.

The interface unit comprises a plurality of driving reserved interfaces, and each driving reserved interface is electrically connected with a device which is independently packaged in the 3D printing equipment such as the energy radiation system 32 and the Z-axis driving mechanism 35 and transmits data or drives to work through the interface, so that the devices which are independently packaged in the 3D printing equipment such as the energy radiation system 32 and the Z-axis driving mechanism 35 and transmit data or drive to work through the interface are controlled. The control device further comprises at least one of the following: a prompting device, a human-computer interaction unit and the like. The interface unit determines its interface type according to the connected device, which includes but is not limited to: universal serial interface, video interface, industrial control interface, etc. For example, the drive reservation interface includes: the energy radiation system comprises a USB interface, a plurality of HDMI interfaces and a plurality of RS232 interfaces, wherein the USB interface and the RS232 interfaces are respectively provided, the USB interface can be connected with a human-computer interaction unit and the like, and the RS232 interfaces are connected with the energy radiation system 32, the Z-axis driving mechanism 35 and the like so as to control the energy radiation system 32, the Z-axis driving mechanism 35 and the like.

In summary, the 3D printing apparatus in the present application is configured with the brightness detection fixture for detecting the brightness of each area of the radiation surface of the energy radiation device, and the first measurement device thereof can traverse each light transmission portion on the detection plate in a moving state, so as to detect the brightness of the light transmitted from the light transmission holes at different positions by the energy radiated by the energy radiation device, thereby obtaining the intensities of the energy radiated by the energy radiation device at different positions, and providing data support for the calibration of the energy radiation device. Moreover, the first measuring device can detect the brightness of the light rays transmitted out of the light transmitting parts at one detection position, and the detection efficiency is effectively improved. The detection data provided by the brightness detection jig can be used for calibrating the energy radiation device of the 3D printing equipment, so that the brightness of the radiation surface of the energy radiation device is kept uniform.

The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.

Claims (11)

1. A brightness detection jig is characterized by comprising:

the detection plate is provided with a plurality of light-transmitting groups for transmitting light; each light transmission group comprises at least one light transmission part;

and the second side surface of the first measuring device is provided with a plurality of light intensity detecting elements corresponding to at least one light transmitting group so as to traverse each light transmitting part in a moving state to detect the brightness of light transmitted from each light transmitting part.

2. The brightness detection jig according to claim 1, further comprising a guide rail, the guide rail being located on one side of the first side surface of the detection plate or on two opposite sides thereof; wherein the first measuring device is provided on the guide rail to traverse each light-transmitting portion in a process of moving along the guide rail.

3. The brightness detecting jig according to claim 1, wherein the detecting plate further has a central light-transmitting portion formed at a center thereof.

4. The apparatus of claim 3, further comprising a second measuring device for measuring the brightness of the light passing through the central light-transmitting portion.

5. The brightness detection jig according to claim 4, wherein a center positioning structure for positioning the second measuring device is further provided on the detection plate.

6. The brightness detection jig according to claim 1, wherein the detection plate further has a plurality of positioning holes formed thereon for determining a positional relationship between the detection plate and the projected pattern of the light source.

7. The apparatus according to claim 1, wherein the light-transmitting portions are formed on the detection plate in an array, each row of the light-transmitting portions is defined as a light-transmitting group, and the plurality of light intensity detection elements of the first measurement device correspond to at least one of the light-transmitting groups in position and number.

8. The brightness detection jig according to claim 7, wherein a positioning mark for indicating the detection position of each light-transmitting group is provided on the detection plate, or a corresponding positioning mark for indicating the detection position of each light-transmitting group is provided on the detection plate and the first measurement device.

9. The apparatus according to claim 7, wherein the detecting plate and the first measuring device are provided with corresponding positioning mechanisms for positioning to the detecting position of each light transmitting group during the process of the first measuring device traversing each light transmitting portion.

10. The brightness detection jig according to claim 8 or 9, wherein the positioning mechanism comprises:

the positioning grooves are arranged on the detection plate and correspond to the detection positions of the light transmission groups;

and the positioning pin is arranged on the first measuring device and sequentially falls into the positioning groove in the process that the first measuring device traverses all the light transmission parts.

11. A3D printing apparatus, comprising:

a container for holding a photocurable material to be cured;

the energy radiation system is arranged at a preset position on one side of the top or the bottom of the container and is configured to radiate energy to a printing reference surface in the container through a control program when a printing instruction is received so as to cure the light-cured material on the printing reference surface;

a member stage, located in the container in a printing state, for attaching a cured layer obtained after energy radiation so as to form a printing member by accumulation of the cured layer;

a Z-axis driving mechanism connected with the component platform and configured to adjust the distance between the component plate and the bottom surface of the container according to a printing instruction so as to fill the photo-curing material to be cured;

the brightness detection fixture according to any one of claims 1 to 10, for detecting brightness of different areas in the radiation surface of the energy radiation device during calibration operation;

and the control device is electrically connected with the energy radiation system and the Z-axis driving mechanism and is used for enabling the energy radiation system and the Z-axis driving mechanism to cooperatively work to print the 3D component.

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