CN108044943B - automatic detection and judgment method based on 3D printer - Google Patents
automatic detection and judgment method based on 3D printer Download PDFInfo
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- CN108044943B CN108044943B CN201711288128.2A CN201711288128A CN108044943B CN 108044943 B CN108044943 B CN 108044943B CN 201711288128 A CN201711288128 A CN 201711288128A CN 108044943 B CN108044943 B CN 108044943B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
Abstract
The invention provides an automatic detection and judgment method based on a 3D printer, which determines whether the printing of the bottom base surface of the current printing model is finished by judging whether the brightness change information of all photo-detection areas corresponding to each piece of Z coordinate information accords with a preset brightness change rule or not under N pieces of continuously-changed Z coordinate information, or whether the brightness change information of all photo-detection areas corresponding to each piece of Z coordinate information accords with the preset brightness change rule or not, detects whether the brightness value in the photo-detection areas exceeds the preset brightness value or not through a light sensor after the printing of the bottom base surface of the printing model is finished, and if so, indicates that the bottom base surface of the printing model generates a warping phenomenon, and the light sensor sends a light change signal to a control system. The control system receives the light change signal transmitted by the light sensor, and controls the printing head to stop discharging through the stepping driver, so that the aim of saving materials is fulfilled.
Description
Technical Field
The invention relates to the technical field of 3D printers, in particular to an automatic detection and judgment method based on a 3D printer.
Background
3D printing, one of the rapid prototyping technologies, is a technology for constructing an object by using an adhesive material such as powdered metal or plastic based on a digital model file and by printing layer by layer. The 3D printing is usually implemented by a digital technology material printer, and is often used for manufacturing models in the fields of mold manufacturing, industrial design, and the like, and then gradually used for direct manufacturing of some products, and there are already parts printed by using this technology. The technology has applications in jewelry, footwear, industrial design, construction, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and other fields.
The currently mainstream 3D printing technology mainly includes four technologies, namely, a light curing molding technology (SLA), a three-dimensional powder bonding technology (3DP), a selective laser sintering technology (SLS), and a fused deposition rapid prototyping technology (FDM). Among them, fused deposition rapid prototyping (FDM), also called fuse deposition, is a technique in which a filament-like hot-melt material is heated to melt and extruded through a nozzle having a fine nozzle. When the three-dimensional computer model thermal-melting material cutting machine works, the distances among all layers are determined firstly, the three-dimensional computer model is sliced by the computer to generate a path, then the spray head moves to discharge under the control of the computer according to the path, the hot-melting material is adhered to the workbench or the solidified layer surface of the previous layer, the workbench moves downwards by one layer distance when the layer is solidified, the layer-by-layer manufacturing is repeated until the last layer is formed, and the final finished product is formed by the layer-by-layer accumulation of the material.
In order to facilitate the printing of the finished product, the finished product is taken down from the workbench (namely, the printing bottom plate), the hot-melt material is generally selected from materials with moderate adhesion, so that when the height of the printed product is higher, the bottom surface of the printed product is easily tilted with the contact part of the workbench, and then the printing head cannot accurately print according to a preset track, so that the printed product cannot meet the expected requirement. Meanwhile, the FDM technique generally has a problem that the material wire must be continuously fed during printing, and the forming time of FDM is generally long, if the contact part of the bottom surface of the printed product and the workbench is tilted, not only the model of the former formed part is scrapped, but also the material wire is continuously fed, which causes a lot of waste of the material (according to the expected computer model, the feeding is stopped only when the printing is completely finished).
Disclosure of Invention
The automatic detection and judgment method based on the 3D printer is used for solving the problem that materials are wasted as the material wires of the printing head cannot be stopped to continue feeding when the bottom surface of a printed model of the existing 3D printer is tilted.
in order to achieve the above object, the inventor provides an automatic detection and judgment method based on a 3D printer, where the 3D printer includes a transparent printing substrate, a plurality of size detection sensors, a printing head positioning system, a stepping driver, and a control system; the transparent printing bottom plate is provided with MxN light detection areas, each light detection area is internally provided with a light sensor, and the light sensors are used for detecting the brightness change information of the light detection areas; the size detection sensors are used for acquiring sizes of the cross section of the silk material; the method comprises the following steps:
the printing head positioning system detects coordinate position information of a current printing head, wherein the coordinate position information comprises X coordinate information, Y coordinate information and Z coordinate information; the X coordinate information and the Y coordinate information are coordinate information projected to the transparent printing bottom plate by the printing head, and the Z coordinate information is height information of the printing head relative to the transparent printing bottom plate;
the control system starts a light sensor in the light detection area after the size change of the cross section of the filament material collected by the size detection sensor corresponding to each piece of Z coordinate information meets a preset size change rule under the condition of judging the continuously changed N pieces of Z coordinate information;
When detecting that the brightness value in the photo detection area exceeds a preset brightness value, the light sensor sends a light change signal to the control system;
the control system receives light change signals transmitted by the light sensor and controls the printing head to stop moving and discharge through the stepping driver.
further, the plurality of dimensions of the cross-section of the filament material include a first dimension and a second dimension, the first dimension being greater than the second dimension; the number of N is 3; the method comprises the following steps:
And the control system starts the light sensor in the light detection area when the cross-sectional dimension of the filament material corresponding to the printing head is sequentially the first dimension, the first dimension and the second dimension under the condition of judging the continuously changed 3Z coordinate information acquired by the dimension detection sensor.
further, the method comprises the steps of:
the control system judges whether the number of the light sensors which transmit light change signals to the control system exceeds a preset number, if so, the stepping driver controls the printing head to stop moving and discharging, and otherwise, the stepping driver controls the printing head to continue moving and discharging.
further, the method comprises the steps of:
The control system sends out prompt information when the printing head is controlled by the stepping driver to stop moving and discharge.
The inventor also provides an automatic detection and judgment method based on the 3D printer, wherein the 3D printer comprises a transparent printing bottom plate, a printing head positioning system, a stepping driver and a control system; the transparent printing bottom plate is provided with MxN light detection areas, each light detection area is internally provided with a light sensor, and the light sensors are used for detecting the brightness change information of the light detection areas; the method comprises the following steps:
the control system controls the light sensors below all the light detection areas of the transparent printing bottom plate to be in an open state;
The printing head positioning system detects coordinate position information of a current printing head, wherein the coordinate position information comprises X coordinate information, Y coordinate information and Z coordinate information; the X coordinate information and the Y coordinate information are coordinate information projected to the transparent printing bottom plate by the printing head, and the Z coordinate information is height information of the printing head relative to the transparent printing bottom plate;
the control system executes the following steps after judging that the brightness change information of all the photo detection areas corresponding to each piece of Z coordinate information accords with a preset brightness change rule under the condition that the continuously changed N pieces of Z coordinate information are judged:
when detecting that the brightness value in the photo detection area exceeds a preset brightness value, the light sensor sends a light change signal to the control system;
The control system receives light change signals transmitted by the light sensor and controls the printing head to stop moving and discharge through the stepping driver.
Further, the number of N is 3, and the MxN photodetection regions include a first photodetection array region and a second photodetection array region; the method comprises the following steps:
When the control system judges that the information of the continuously changed 3Z coordinates is changed, the brightness change information of the light detection areas is changed according to a preset brightness change rule that the brightness value of the first light detection array area is lower than a preset dark part brightness value, the brightness value of the second light detection array area is lower than a preset dark part brightness value, and the brightness values of all the light detection areas except the first light detection array area and the second light detection array area are lower than a preset dark part brightness value, the light sensors in the light detection areas are started.
Further, the method comprises the steps of:
The control system judges whether the number of the light sensors which transmit light change signals to the control system exceeds a preset number, if so, the stepping driver controls the printing head to stop moving and discharging, and otherwise, the stepping driver controls the printing head to continue moving and discharging.
further, the method comprises the steps of:
the control system sends out prompt information when the printing head is controlled by the stepping driver to stop moving and discharge.
different from the prior art, the automatic detection and judgment method based on the 3D printer is applied to the 3D printer with the transparent printing bottom plate, MxN light detection areas are arranged on the transparent printing bottom plate, a light sensor is arranged in each light detection area, and the light sensors are used for detecting the brightness change information of the light detection areas. The method comprises the steps of determining whether the printing of the bottom base surface of the current printing model is finished by judging whether the brightness change information of all the photo detection areas corresponding to each piece of Z coordinate information accords with a preset brightness change rule or not under the continuously changed N pieces of Z coordinate information, or whether the brightness change information of all the photo detection areas corresponding to each piece of Z coordinate information accords with the preset brightness change rule or not, and detecting whether the brightness value in the photo detection areas exceeds the preset brightness value or not through a light sensor when the printing of the bottom base surface of the printing model is finished. If the brightness value in the photo detection area is detected to exceed the preset brightness value, the bottom base surface of the printing model is warped relative to a printing bottom plate of the 3D printer, and the light sensor sends a light change signal to the control system. The control system receives light change signals transmitted by the light sensor, and controls the printing head to stop moving and discharge through the stepping driver, so that the aim of saving materials is fulfilled.
Drawings
Fig. 1 is a flowchart of an automatic detection and determination method based on a 3D printer according to an embodiment of the present invention;
Fig. 2 is a flowchart of an automatic detection and determination method based on a 3D printer according to another embodiment of the present invention;
FIG. 3 is a schematic view of a bottom base of a printing module according to an embodiment of the present invention;
Fig. 4 is a schematic diagram of a printing backplane of a 3D printer according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a printing backplane of a 3D printer application process according to an embodiment of the present invention;
description of reference numerals:
101. Printing a bottom plate; 102. a light sensor; 103. a photo detection region; 104. printing the bottom surface of the model;
201. First material silk; 202. and (7) second material threads.
Detailed Description
to explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
fig. 4 is a schematic diagram of a printing backplane of a 3D printer according to an embodiment of the present invention. The 3D printer comprises a transparent printing bottom plate 101, a plurality of size detection sensors, a printing head positioning system, a stepping driver and a control system; the transparent printing bottom plate is provided with MxN light detection areas 103, each light detection area 103 is internally provided with a light sensor 102, and the light sensors 102 are used for detecting the brightness change information of the light detection areas; the size detection sensors are used for collecting sizes of the cross section of the silk material. The printing bottom plate is designed to be transparent, so that the light sensor can capture light in time when the brightness in the light detection area is changed. The size and density of the light detection area can be adjusted according to actual needs.
fig. 1 is a flowchart illustrating an automatic detection and determination method based on a 3D printer according to an embodiment of the present invention. The method comprises the following steps:
the method first proceeds to step S101 where the print head positioning system detects coordinate position information of the current print head. The coordinate position information comprises X coordinate information, Y coordinate information and Z coordinate information; the X coordinate information and the Y coordinate information are coordinate information projected to the transparent printing bottom plate by the printing head, and the Z coordinate information is height information of the printing head relative to the transparent printing bottom plate.
and then, in the step S102, the control system starts the light sensor in the light detection area after the size change of the cross section of the filament material acquired by the size detection sensor corresponding to each piece of Z coordinate information accords with a preset size change rule under the condition that the continuously changed N pieces of Z coordinate information are judged.
And then step S103, when the light sensor detects that the brightness value in the light detection area exceeds the preset brightness value, the light sensor sends a light change signal to the control system.
And then, the control system receives the light change signal transmitted by the light sensor in step S104, and controls the printing head to stop moving and discharge through the stepping driver.
In short, when the control system determines that the size of the cross section of the filament material collected by the size detection sensor corresponding to each piece of Z coordinate information is changed according to the preset size change rule, it indicates that the bottom base surface of the current printing model (which is equivalent to the base of the printing model, and the model starts to enter the formal printing on the base) is printed, and thus the light sensor in the light detection area is turned on. If the brightness value in the photo detection area is detected to exceed the preset brightness value, the edge warping phenomenon occurs in the part of the photo detection area originally covered by the material wire (namely, the photo detection area on the printing bottom plate of the 3D printer originally covered by the material wire on the bottom base surface of the printing model is covered by the material wire, so the brightness value of the photo detection area of the covered part is darker than that of the uncovered part, and if the covered part is changed from dark to bright again, the edge warping phenomenon occurs). When the edge warping phenomenon of the bottom base surface of the printing model is detected, the control system controls the printing head to stop discharging continuously (specifically, the control system can control the motor of the extruder through the stepping driver), and therefore the purpose of saving materials is achieved.
at present, the bottom plate filament (namely the bottom base surface of a printing model) of a 3D printer is generally three layers, and the section size of the three layers of filament materials follows the variation rule of thickness, thickness and fineness from bottom to top. Thus, in certain embodiments, the plurality of dimensions of the cross-section of the filament material include a first dimension and a second dimension, the first dimension being greater than the second dimension; the number of N is 3; the method comprises the following steps: and the control system starts the light sensor in the light detection area when the cross-sectional dimension of the filament material corresponding to the printing head is sequentially the first dimension, the first dimension and the second dimension under the condition of judging the continuously changed 3Z coordinate information acquired by the dimension detection sensor. In short, whether the printing of the current baseboard wire is finished is determined by judging whether the cross-sectional dimension of the continuous 3 layers (namely, the Z coordinate information continuously changes three times) of the wire material conforms to the change rule of 'thickness, thickness and thinness', and after the printing of the baseboard wire is judged to be finished, the photoelectric sensor is started. The scheme can better determine the time when the light sensor starts to detect the change of the light, so that the brightness detection of the light detection area is carried out orderly.
In the practical application process, when the density of the photodetection area is high, if the bottom base surface of the printing model is only slightly tilted, the whole printing of the upper model cannot be affected, otherwise, if the bottom base surface of the model is already obviously tilted, the whole printing model is likely to be scrapped if the printing is continued, and the two conditions are comprehensively considered. In short, the light change signal is sent out to indicate that the light sensors below a certain light detection area detect that a part of the bottom base surface of the model covering the light detection area is tilted, and if the number of the light sensors transmitting the light change signal exceeds a preset number, the situation that a large part of the bottom base surface of the model is tilted relative to the printing bottom plate at the moment is indicated, the printing head needs to be stopped immediately to continue discharging and printing, so that a large amount of loss of the material wires is avoided, and therefore the control system controls the extruder motor to stop working through the stepping driver.
In certain embodiments, the method further comprises the steps of: the control system sends out prompt information when the printing head is controlled by the stepping driver to stop moving and discharge. The prompt message comprises voice prompt message, image prompt message, video prompt message, light prompt message and the like. Can inform the bottom surface of user's current model through the tip phenomenon of having taken place to stick up the limit, avoid continuing extravagant material silk, the printer has stopped continuing the ejection of compact to the user takes measures to solve. For example, the user may remove a previously formed portion of the obsolete model from the printing substrate and reset to start a new printing operation.
Fig. 2 is a flowchart illustrating an automatic detection and determination method based on a 3D printer according to another embodiment of the present invention. The 3D printer comprises a transparent printing bottom plate, a printing head positioning system, a stepping driver and a control system; the transparent printing bottom plate is provided with MxN light detection areas, each light detection area is internally provided with a light sensor, and the light sensors are used for detecting the brightness change information of the light detection areas; the method comprises the following steps:
firstly, step S201 is entered, the control system controls the light sensors below all the photo detection areas of the transparent printing bottom plate to be in an open state;
then, the printing head positioning system detects the coordinate position information of the current printing head in step S202, wherein the coordinate position information comprises X coordinate information, Y coordinate information and Z coordinate information; the X coordinate information and the Y coordinate information are coordinate information projected to the transparent printing bottom plate by the printing head, and the Z coordinate information is height information of the printing head relative to the transparent printing bottom plate;
Then, step S203 is executed in which the control system determines whether the brightness change information of all the photo detection areas corresponding to each piece of Z coordinate information meets a preset brightness change rule under the continuously changing N pieces of Z coordinate information, and if so, executes the following steps:
Then step S204, when the light sensor detects that the brightness value in the light detection area exceeds a preset brightness value, a light change signal is sent to the control system;
and then, the control system receives the light change signal transmitted by the light sensor in step S205, and controls the print head to stop moving and discharge through the stepping driver.
in short, when the control system determines that N pieces of Z coordinate information continuously change, the brightness change information of all the photo detection areas corresponding to each piece of Z coordinate information conforms to the preset brightness change rule, which indicates that the bottom base surface of the current printing model (which is equivalent to the base of the printing model on which the model starts to enter formal printing) has been printed, so that the following steps can be performed: specifically, if the photoelectric sensor detects that the brightness value in the photo detection area exceeds the preset brightness value again, it is indicated that the edge warping phenomenon occurs in the portion of the photo detection area originally covered by the material wire (that is, the brightness value of the photo detection area covered by the material wire of the bottom base surface of the printing model is darker than that of the uncovered portion because the photo detection area on the printing bottom plate of the 3D printer is covered by the material wire, and if the covered portion is changed from dark to bright again, the edge warping phenomenon occurs). When the edge warping phenomenon of the bottom base surface of the printing model is detected, the control system controls the printing head to stop discharging continuously (specifically, the control system can control the motor of the extruder through the stepping driver), and therefore the purpose of saving materials is achieved.
At present, the bottom plate filament (namely the bottom base surface of a printing model) of a 3D printer is generally three layers, and the section size of the three layers of filament materials follows the variation rule of thickness, thickness and fineness from bottom to top. Thus, in some embodiments, the number of N is 3, and the MxN photodetection regions include a first photodetection array region and a second photodetection array region; the method comprises the following steps: and when the control system judges that the brightness change information of the photodetection areas changes according to a preset brightness change rule that the brightness value of the first photodetection array area is lower than a preset dark part brightness value, the brightness value of the second photodetection array area is lower than a preset dark part brightness value, and the brightness values of all the photodetection areas except the first photodetection array area and the second photodetection array area are lower than a preset dark part brightness value under the condition of judging that the 3Z coordinate information continuously changes, the control system judges that the printing of the bottom base surface of the printing model is finished.
As shown in fig. 3, the printing substrate 101 is provided with 6 × 10 photo-detection regions (i.e., M is 6, and N is 10), and it is assumed that the step of the Z-coordinate information is 1, i.e., the Z-coordinate information between two adjacent layers differs by 1. After the 3D printer starts to work, a filament with a first size in cross section (i.e., a black filled portion in the drawing, denoted as a first filament 201) is printed in an X-Y plane with Z coordinate information of 0, and a light detection area covered with the filament with the first size in cross section is denoted as a first light detection array area, i.e., five rows of light detection areas 1, 3, 5, 7, and 9 in the drawing. Then, a control system of the 3D printer adjusts Z coordinate information of the print head, and continues to print with the filament with the first size cross section (i.e., the shaded filling portion in the figure, which is denoted as the second filament 202) in the X-Y plane where the Z coordinate information is 1, and marks a photo-detection area covered with the filament with the first size cross section in the X-Y screen as a second photo-detection array area, which is 1, 3, and 5 rows of photo-detection areas in the figure. And then a control system of the 3D printer adjusts Z coordinate information of the printing head, and fills all the light detection areas by adopting a material wire (not marked in the figure) with a second size of section in an X-Y plane with the Z coordinate information of 2, so that a thick-layer bottom plate wire, a thick-layer bottom plate wire and a thin-layer bottom plate wire are formed, the completion of the printing of the bottom base surface of the model is shown, and then the printing of the specific structure of the model can be formally started on the bottom plate wire. Based on the characteristic, for the light sensor, when the brightness change information of the continuous 3-layer photo-detection areas is detected to be changed according to a preset brightness change rule that the brightness value of the first photo-detection array area is lower than a preset dark part brightness value, the brightness value of the second photo-detection array area is lower than a preset dark part brightness value, and the brightness values of all the photo-detection areas except the first photo-detection array area and the second photo-detection array area are lower than a preset dark part brightness value, the printing of the bottom base surface of the printing model is judged to be completed. And then, judging whether the bottom base surface is warped or not can be started, wherein the judging mode is as described above, and the details are not repeated here.
The inventor also provides a 3D printer, which includes a transparent printing bottom plate 101, the transparent printing bottom plate 101 is provided with MxN photo detection regions 103, and each photo detection region 103 is provided with a light sensor 102. The printing bottom plate is designed to be transparent, so that the light sensor can capture light in time when the brightness in the light detection area is changed. The size and density of the light detection area can be adjusted according to actual needs.
the 3D printer further comprises:
the printing head is arranged above the transparent printing bottom plate and used for feeding the wire material to an extruder motor of the heater, and the extruder motor is a stepping motor. The printhead typically includes an extruder including an extruder motor having an output gear that engages and drives the filament of printing material forward into a heating unit. The extruder motor may be any suitable type of motor, such as a stepper motor controlled by a stepper driver. The heating unit is used for melting the wires, the heated wires can be output through a nozzle of the printing head, and then layer-by-layer printing is started.
The printing head positioning system is used for acquiring coordinate position information of the printing head, and the coordinate position information comprises X coordinate information, Y coordinate information and Z coordinate information; the X coordinate information and the Y coordinate information are coordinate information projected to the transparent printing bottom plate by the printing head, and the Z coordinate information is height information of the printing head relative to the transparent printing bottom plate. The 3D printer is carried out based on slices in the printing process, and the computer determines the path of each slice according to the three-dimensional computer model, namely the preset coordinate change information of each slice. In the practical application process, the coordinate position information of the printing head continuously changes along with the movement of the printing head, so that the printing head positioning system can feed the current coordinate position information of the printing head back to the control system in real time, and the control system can acquire the printing progress of the current model and the current coordinate position information of the printing head.
a stepper driver connected to the extruder motor and capable of controlling operation of the extruder motor. The control system is used for controlling the operation of the stepping driver according to the change of the coordinate position information transmitted by the printing head positioning system and the light change signal transmitted by the light sensor.
in short, the control system can determine the bottom surface information of the printing model according to the coordinate position information transmitted by the printing head positioning system, and can judge whether the bottom surface of the current printing model has the edge warping phenomenon according to the light change signal transmitted by the light sensor in the printing process. When the light sensor detects that the brightness of the photo-detection area originally lower than the preset brightness value becomes higher than the preset brightness value, it indicates that the edge warping phenomenon occurs in the portion of the photo-detection area originally covered by the material wire (i.e. the bottom surface of the printing model, because the portion is covered by the material wire, the brightness value detected by the covered portion of the photo-detection area is darker than that detected by the uncovered portion). When the bottom surface of the printing model is detected to have the edge warping phenomenon, the control system controls the printing head to stop discharging continuously (specifically, the control system can control the extruder motor through the stepping driver), so that the purpose of saving materials is achieved.
in order to save power consumption and better determine the time when the light sensor starts to detect the light change, in some embodiments, the control system includes a sensor control circuit, and the sensor control circuit is used for turning on the light sensor in the light detection area after receiving a Z coordinate information change signal sent by the printing head positioning system; the Z coordinate information change signal is a signal generated when the printing head starts from the transparent printing bottom position and the Z coordinate information changes for the first time. The printing process of the 3D printer is to print layer by layer, namely the printing head moves in an X-Y plane to finish the printing operation in the plane, then the Z coordinate information of the printing head is adjusted, and the printing is continued in the X-Y plane where the adjusted Z coordinate information is located, and the steps are repeated until the model is finally printed. Based on the characteristic of the 3D printer, the signal generated when the printing head changes from the transparent printing bottom position and the first Z coordinate information can be used as a mark for completing the bottom printing of the model to be printed. The sensor control circuit starts the light sensor below the light detection area after the bottom surface of the model to be printed is printed, and then judges whether the bottom surface of the model to be printed has the edge warping phenomenon or not by judging whether the light sensor detects that the brightness value of the light detection area is changed from dark to bright or not. Through the scheme, the opportunity for the light sensor to start to detect the change of light can be well determined, so that the detection of whether the edge is warped is started after the bottom surface of the model is printed, on one hand, misjudgment is not easy to occur, and on the other hand, power consumption is also saved.
In order to further reduce power consumption, in some embodiments, the control system further includes a main controller, where the main controller is configured to obtain the bottom surface information of the printing model according to a moving track of the printing head on the transparent printing bottom plate when the sensor control circuit is configured to receive a Z coordinate information change signal sent by the printing head positioning system, and turn on the light sensor in the light detection area where the bottom surface information of the printing model is located through the sensor control circuit; and the bottom surface information of the printing model is determined according to the change condition of the X coordinate information and the change condition of the Y coordinate information of the printing head on the transparent printing bottom plate. In short, after the bottom surface of the model is determined, only the light sensor below the light detection region covered by the bottom surface of the model needs to be turned on. The light sensor below the light detection area uncovered by the bottom surface of the model can be selected not to be started, so that the purpose of saving power consumption is achieved. For example, the bottom surface 104 of the printing model in fig. 5 is a triangle with a shaded portion, the sensor control circuit only needs to turn on the light sensor below the light detection region covered by the triangle.
In some embodiments, the light sensor is configured to send a light change signal to the control system when detecting that the brightness value in the photo detection area exceeds a preset brightness value. The control system is used for the light variation signal transmitted by the light sensor to control the operation of the stepping driver and comprises: the control system is used for controlling the extruder motor to stop working through the stepping driver according to the light change signal transmitted by the light sensor. Preferably, the 3D printer further comprises a prompt unit, and the control system is further configured to control the extruder motor to stop working through the step driver, and send a prompt message through the prompt unit. The prompt message comprises voice prompt message, image prompt message, video prompt message, light prompt message and the like. Can inform the bottom surface of user's current model through the tip phenomenon of having taken place to stick up the limit, avoid continuing extravagant material silk, the printer has stopped continuing the ejection of compact to the user takes measures to solve. For example, the user may remove a previously formed portion of the obsolete model from the printing substrate and reset to start a new printing operation.
In the practical application process, when the density of the photo detection area is high, if the bottom surface of the model is slightly tilted, the whole printing of the model above is not affected, otherwise, if the bottom surface of the model is obviously tilted, the whole printing model is likely to be scrapped if the printing is continued, and in consideration of the two conditions, in some embodiments, the control system is further used for judging whether the number of the light sensors for transmitting the light change signal exceeds the preset number, if so, the extruder motor is controlled to stop working through the step driver, otherwise, the extruder motor is not controlled to stop working by the step driver. In short, the light change signal is sent out to indicate that the light sensors below a certain light detection area detect that a part of the bottom surface of the model covering the light detection area is tilted, and if the number of the light sensors transmitting the light change signal exceeds a preset number, the light change signal indicates that a large part of the bottom surface of the model is tilted at the moment, the printing head needs to be stopped immediately to continue discharging and printing, so that a large amount of loss of the material wire is avoided, and the extruder motor is controlled by the stepping driver to stop working.
It should be noted that the above embodiments are only examples of the present invention, and those skilled in the art can make other changes and modifications to these embodiments once they know the basic inventive concept of the present invention, so that although the above embodiments have been described herein, they do not limit the scope of the present invention, and all equivalent structures or equivalent processes using the contents of the present specification and drawings, or directly or indirectly using other related technical fields, are included in the scope of the present invention.
Claims (4)
1. An automatic detection and judgment method based on a 3D printer is characterized in that the 3D printer comprises a transparent printing bottom plate, a printing head positioning system, a stepping driver and a control system; the transparent printing bottom plate is provided with MxN light detection areas, each light detection area is internally provided with a light sensor, and the light sensors are used for detecting the brightness change information of the light detection areas; the method comprises the following steps:
The control system controls the light sensors below all the light detection areas of the transparent printing bottom plate to be in an open state;
the printing head positioning system detects coordinate position information of a current printing head, wherein the coordinate position information comprises X coordinate information, Y coordinate information and Z coordinate information; the X coordinate information and the Y coordinate information are coordinate information projected to the transparent printing bottom plate by the printing head, and the Z coordinate information is height information of the printing head relative to the transparent printing bottom plate;
The control system executes the following steps after judging that the brightness change information of all the photo detection areas corresponding to each piece of Z coordinate information accords with a preset brightness change rule under the condition that the continuously changed N pieces of Z coordinate information are judged:
When detecting that the brightness value in the photo detection area exceeds a preset brightness value, the light sensor sends a light change signal to the control system;
the control system receives light change signals transmitted by the light sensor and controls the printing head to stop moving and discharge through the stepping driver.
2. The method as claimed in claim 1, wherein the number of N is 3, and the MxN photo detection regions include a first photo detection array region and a second photo detection array region; the method comprises the following steps:
When the control system judges that the information of the continuously changed 3Z coordinates is changed, the brightness change information of the light detection areas is changed according to a preset brightness change rule that the brightness value of the first light detection array area is lower than a preset dark part brightness value, the brightness value of the second light detection array area is lower than a preset dark part brightness value, and the brightness values of all the light detection areas except the first light detection array area and the second light detection array area are lower than a preset dark part brightness value, the light sensors in the light detection areas are started.
3. The 3D printer-based automatic detection and judgment method according to claim 1, wherein the method comprises the steps of:
The control system judges whether the number of the light sensors which transmit light change signals to the control system exceeds a preset number, if so, the stepping driver controls the printing head to stop moving and discharging, and otherwise, the stepping driver controls the printing head to continue moving and discharging.
4. The 3D printer based automatic detection and judgment method according to any one of claims 1 to 3, characterized in that the method further comprises the steps of:
the control system sends out prompt information when the printing head is controlled by the stepping driver to stop moving and discharge.
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| CN205202211U (en) * | 2015-12-17 | 2016-05-04 | 龙泉市金宏瓷业有限公司 | 3D (three -dimensional) printer |
| CN205763864U (en) * | 2016-07-21 | 2016-12-07 | 中北大学 | A kind of dusty material laser sintering (SLS) device |
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| US10406801B2 (en) * | 2015-08-21 | 2019-09-10 | Voxel8, Inc. | Calibration and alignment of 3D printing deposition heads |
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| CN205763864U (en) * | 2016-07-21 | 2016-12-07 | 中北大学 | A kind of dusty material laser sintering (SLS) device |
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