Printing panel detection method, 3D printer, and electronic device

Abstract

Provided in the present application are a printing panel detection method, a 3D printer, and an electronic device. The detection method is applicable to a 3D printer, which comprises a heated bed, a printing head and a printing panel, wherein a detection apparatus is disposed in the printing head. In a specific implementation, the method comprises: controlling a printing head to move to a target area, and then controlling the printing head to descend; and during the process of controlling the printing head to descend, on the basis of a signal output from a detection apparatus, detecting whether a printing panel is placed on the surface of a heated bed. By means of implementing the present application, whether a printing panel is placed on the surface of a heated bed can be automatically detected, such that the reliability is high.

Description

Printing panel detection method, 3D printer and electronic equipment

[0001] This application claims priority to the Chinese patent application with application number 202410065074.7 filed with the State Intellectual Property Office of China on January 16, 2024, and priority to the Chinese patent application entitled “A method for detecting a printed panel, a 3D printer and an electronic device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of 3D printing technology, and in particular to a method for detecting a printed panel, a 3D printer, and an electronic device. Background Art

[0003] A 3D printer (also known as a three-dimensional printer or stereo printer) is a rapid prototyping device. Currently, 3D printers utilize fused deposition modeling (FDM), a technology that constructs three-dimensional objects layer by layer using printing materials such as powdered metal or plastic, based on digital models.

[0004] 3D printers require a print plate placed on the heated bed to support the printing material. The material adheres to the plate and can be removed from the plate after printing. Without a print plate, the material is extruded directly onto the heated bed, making it difficult to remove the printed part and potentially damaging the 3D printer. Therefore, it's necessary to check whether a print plate is in place in a 3D printer. Summary of the Invention

[0005] The present application provides a printing panel detection method, a 3D printer, and an electronic device, which can detect whether the printing panel is placed on the surface of a hot bed with high reliability.

[0006] First, embodiments of the present application provide a method for detecting a print panel. This method is applicable to a 3D printer comprising a heated bed, a print head, and a print panel, wherein the print head is provided with a detection device. In a specific implementation, the print head is controlled to move to a target area and then lowered. During the process of lowering the print head, a signal output by the detection device is used to detect whether the print panel is placed on the heated bed.

[0007] This application can automatically detect whether the printing panel is placed on the surface of the hot bed, avoiding directly squeezing the printing material onto the surface of the hot bed, which can ensure the printing quality and high reliability.

[0008] In conjunction with the first aspect, in a first possible implementation, the detection device includes a force sensing device. In the process of controlling the print head to descend, the detection device detects whether the print panel is placed on the surface of the hot bed based on the signal output by the detection device, which is specifically implemented as follows:

[0009] When the print head is controlled to descend within a preset height range, if the signal output by the force sensing device changes, it is detected that the print panel is placed on the surface of the hot bed.

[0010] In this application, when the print head contacts the print panel, the force applied to the print head changes, and the signal output by the force sensor changes, thereby detecting whether the print panel is placed on the surface of the heated bed. Implementing this application, using a force sensor to detect whether the print panel is placed on the heated bed is low-cost and highly accurate.

[0011] In combination with the first aspect or any one of the above possible implementations of the first aspect, in a second possible implementation, the detection device includes a force sensing device. During the process of controlling the print head to descend, detecting whether the print panel is placed on the surface of the heated bed based on a signal output by the detection device is specifically implemented as follows:

[0012] When the print head is controlled to descend within a preset height range, if the signal output by the force sensing device does not change, it is not detected that the print panel is not placed on the surface of the hot bed.

[0013] In combination with the first aspect or any one of the above possible implementation methods of the first aspect, in a third possible implementation method, before controlling the print head to move to the target area and controlling the print head to descend, the detection method also includes: controlling the print head to move to the lowest point of the printing space of the 3D printer, and the above preset height is the height of the lowest point.

[0014] In the present application, if the printing panel is placed on the surface of the hot bed, the height of the lowest point of the printing space is the height of the printing panel, that is, within the height of the printing panel, the print head will abut against the printing panel, causing the force applied to the print head to change and the signal output by the force sensing device to change.

[0015] In combination with the first aspect or any one of the above-mentioned possible implementation methods of the first aspect, in a fourth possible implementation method, the above-mentioned target area is a projection area of ​​the printing panel relative to the suspended part of the hot bed in the three-dimensional space in the direction along the surface perpendicular to the hot bed.

[0016] In combination with the first aspect or any one of the above possible implementations of the first aspect, in a fifth possible implementation, the force sensing device is configured to change an output signal when the print head is subjected to a force applied by the print panel. This application detects whether the print panel is placed on the surface of the heated bed by feedback from the force applied to the print head by the print panel when the print head abuts the print panel.

[0017] In combination with the first aspect or any of the foregoing possible implementations of the first aspect, in a sixth possible implementation, the print head includes an extrusion wheel, a hot end assembly, and a bracket. The bracket is disposed between the extrusion wheel and the hot end assembly, and a force sensing device is disposed on a side of the bracket facing the hot end assembly. For example, the force sensing device can be specifically implemented as a first coil.

[0018] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in a seventh possible implementation, the detection device includes a distance measuring sensor device.

[0019] In the process of controlling the print head to descend, the detection device outputs a signal to detect whether the printing panel is placed on the surface of the hot bed, which is specifically implemented as follows:

[0020] In the process of controlling the print head to descend, whether the print panel is placed on the surface of the hot bed is detected based on whether the signal output by the distance sensor device continues to increase or decrease.

[0021] In the present application, the distance measuring sensor device outputs a signal that continuously increases or decreases according to the change in the distance between the print head and the print panel, or according to the change in the distance between the print head and the surface of the hot bed, thereby detecting whether the print panel is placed on the surface of the hot bed.

[0022] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in an eighth possible implementation, the printing panel is a conductor, and the surface of the heated bed is a non-conductor.

[0023] The above-mentioned detection of whether the printing panel is placed on the surface of the hot bed is specifically implemented as follows:

[0024] According to the signal output by the distance measuring sensor device continuously increasing or decreasing, it is detected that the printing panel is placed on the surface of the hot bed.

[0025] In the present application, since the print panel is a conductor and the surface of the heated bed is a non-conductor, if the print panel is placed on the surface of the heated bed, the distance measuring sensor device can sense the change in the distance between the print head and the conductor, i.e., the print panel, during the descent process. However, the distance measuring sensor device cannot sense the change in the distance between the print head and the non-conductor, i.e., the heated bed, during the descent process, thereby realizing the detection of whether the print panel is placed on the surface of the heated bed.

[0026] In combination with the first aspect or any one of the above possible implementations of the first aspect, in a ninth possible implementation, the target area is a projection area of ​​the print panel in three-dimensional space in a direction perpendicular to the surface of the print panel.

[0027] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in a tenth possible implementation, the printing panel is a non-conductor, and the surface of the heated bed is a conductor.

[0028] The above-mentioned detection of whether the printing panel is placed on the surface of the hot bed is specifically implemented as follows:

[0029] According to the fact that the signal output by the distance measuring sensor device has not changed, it is detected that the printing panel is placed on the surface of the hot bed.

[0030] In combination with the first aspect or any one of the foregoing possible implementations of the first aspect, in an eleventh possible implementation, the target area is a projection area of ​​the hot bed in three-dimensional space in a direction perpendicular to the surface of the hot bed.

[0031] In a second aspect, an embodiment of the present application provides a 3D printer, comprising a heated bed, a print head, a print panel, and a controller, wherein the controller is configured to execute the detection method described in combination with the first aspect or in combination with any one of the above-mentioned possible implementations of the first aspect.

[0032] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the detection method described in combination with the first aspect or in combination with any one of the above-mentioned possible implementation methods of the first aspect is implemented.

[0033] In a fourth aspect, an embodiment of the present application provides a computer program product, comprising a computer program, wherein, when the computer program is executed by a processor, the detection method described in combination with the first aspect or in combination with any one of the above-mentioned possible implementation methods of the first aspect is implemented.

[0034] It should be understood that the implementation and beneficial effects of the above-mentioned aspects of the present application can be referenced to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic structural diagram of a 3D printer provided in an embodiment of the present application;

[0036] FIG2 is a schematic diagram of a flow chart of a method for detecting a printed panel provided in an embodiment of the present application;

[0037] FIG3 is a schematic diagram of the relative positions of the heated bed and the printing panel provided in an embodiment of the present application;

[0038] FIG4 is a schematic structural diagram of a print head provided in an embodiment of the present application;

[0039] FIG5 is another schematic structural diagram of a print head provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The implementation of the technical solution of the present application is further described in detail below with reference to the accompanying drawings.

[0041] Referring to Figure 1 , which is a schematic diagram of the structure of a 3D printer provided in an embodiment of the present application, as shown in Figure 1 , a 3D printer 101 is connected to a feeding device 102 , which can provide printing materials to the 3D printer 101 .

[0042] The 3D printer 101 includes a print head 1011, a heated bed 1012, and a print panel 1013. The print panel 1013 is placed on the surface of the heated bed 1012. Specifically, the print panel 1013 is placed on the surface of the heated bed 1012 facing the print head 1011.

[0043] The 3D printer 101 also includes a motion assembly 1014. The motion assembly 1014 is connected to at least one of the print head 1011 and the heated bed 1012. During motion of the motion assembly 1014, it can drive at least one of the print head 1011 and the heated bed 1012, causing relative displacement between the print head 1011 and the heated bed 1012. Because the print panel 1013 is placed on the surface of the heated bed 1012, relative displacement can occur between the print head 1011 and the print panel 1013. Exemplarily, the motion assembly 1014 can include a timing belt, a screw, or a guide rail, and this application does not limit the specific form of the motion assembly.

[0044] The print head 1011 includes an extrusion component and a hot end. The extrusion component transports the printing material provided by the feeding device 102 to the 3D printer 101 to the hot end. The hot end has a heating function. The hot end heats the printing material to a molten state and extrude the molten printing material onto the printing panel 1013.

[0045] Illustratively, the hot end includes heat sink fins, a nozzle, and a throat located between the heat sink fins and the nozzle. The printing material sequentially passes through the heat sink fins, the throat, and the nozzle. Specifically, the printing material is heated to a molten state at the nozzle, which then extrude the molten printing material onto the print panel 1013. As at least one of the print head 1011 and the heated bed 1012 moves along the printing path, the nozzle extrude the molten printing material layer by layer onto different locations on the print panel 1013, thereby printing a three-dimensional object.

[0046] The extruder assembly includes a driving wheel and a driven wheel positioned opposite the driving wheel. The printing material passes between the driving and driven wheels. The driving wheel rotates in a first direction, driving the printing material toward the hot end. Rotating in a second direction, opposite to the first, drives the printing material back toward the feeder 102.

[0047] FIG1 takes a 3D printer having a cantilever structure as an example. In some feasible implementations, the structure of the 3D printer may be a gantry structure, a Core xy structure, or a Core xz structure, etc. This application does not limit the specific structure of the 3D printer.

[0048] As shown in Figure 1, the molten printing material needs to be extruded onto the print plate to improve its adhesion. After printing is complete, the print plate can be removed from the heated bed to facilitate removal of the printed three-dimensional object. Therefore, in a 3D printer, detecting whether the print plate is placed on the heated bed is crucial.

[0049] How to implement the detection of the printing panel will be further described below with reference to FIG. 2 to FIG. 5 .

[0050] Referring to FIG2 , FIG2 is a flow chart of a method for detecting a printed panel provided in an embodiment of the present application. As shown in FIG2 , the steps of the detection method include:

[0051] Step S201: Control the print head to move to the target area and control the print head to descend.

[0052] Each step of the detection method provided in this application can be performed by a single controller or multiple controllers with communication connections. The controller can be located in a print head or motion component of a 3D printer, for example. This application does not limit the number of controllers or the locations where they are located.

[0053] Exemplarily, the controller can be, for example, a micro control unit (MCU), a central processing unit (CPU), other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0054] Optionally, the print head is controlled to move to the target area and at the same time the print head is controlled to descend; or, the print head is controlled to move to the target area and then the print head is controlled to descend; or, the print head is controlled to descend and then the print head is controlled to move to the target area.

[0055] The target area may be a pre-set area, and the selection of the target area is related to the specific detection method of the detection device.

[0056] In some feasible embodiments, the detection device includes a force sensing device. Referring to FIG. 3 , FIG. 3 is a schematic diagram illustrating the relative positions of the heated bed and the print panel provided in an embodiment of the present application. As shown in FIG. 3 , when the print panel 1013 is placed on the surface of the heated bed 1012, the target area is the projection of the portion of the print panel 1013 overhanging the heated bed 1012 in three-dimensional space, perpendicular to the heated bed surface (i.e., in the positive direction of the Z axis). For example, the projection of at least one of areas A, B, and C in three-dimensional space. Controlling the print head to the target area involves controlling the nozzle 3011 in the print head to move to the projection of at least one of areas A, B, and C in three-dimensional space, i.e., any projection of areas A, B, and / or C in the positive direction of the Z axis. At this point, the target area is the portion of the print panel 1013 protruding from the heated bed surface, or the portion of the print panel 1013 overhanging the heated bed 1012 in the XY plane. The nozzles 3011 in the print head descend in the opposite direction of the Z axis. If the print panel 1013 is placed on the heated bed 1012, the nozzles 3011 in the print head can abut against the print panel 1013 within a preset height range. It is understood that the nozzles 3011 abut against the solid portion of the print panel 1013, and the target area needs to avoid the holes that pass through the print panel 1013. If the print panel 1013 is not placed on the heated bed 1012, the nozzles 3011 in the print head cannot abut against the print panel 1013 within the preset height range.

[0057] Alternatively, in some feasible embodiments, the detection device is a distance measuring sensor device. The target area is the projection of the print panel in three-dimensional space in a direction perpendicular to the surface of the print panel. Alternatively, the target area is the projection of the heat bed in three-dimensional space in a direction perpendicular to the surface of the heat bed.

[0058] Step S202: During the process of controlling the print head to descend, detecting whether the printing panel is placed on the surface of the heated bed according to the signal output by the detection device.

[0059] For example, the frequency or frequency change of the signal output by the detection device can be used to detect whether the printing panel is placed on the surface of the heated bed. Alternatively, the amplitude or amplitude change of the signal output by the detection device can be used to detect whether the printing panel is placed on the surface of the heated bed.

[0060] In some feasible implementations, the detection device includes a force sensing device, which can change the output signal when the print head is subjected to a force applied by the print panel.

[0061] In the process of controlling the print head to descend, it is specifically implemented that when the print head is controlled to descend within a preset height range, if the signal output by the force sensor device changes, it is detected that the print panel is placed on the surface of the hot bed; if the signal output by the force sensor device does not change, it is detected that the print panel is not placed on the surface of the hot bed.

[0062] Before executing step S201, the print head can be controlled to move to the lowest point of the printing space, and the lowest point can be understood as the zero point of the three-dimensional coordinates of the printing space. The above-mentioned preset height can be specifically considered to be the Z axis equal to zero in the three-dimensional coordinates, and the range of the preset height can be understood as the range near the Z axis. For example, the height of 0.1 on the Z axis can be considered to be within the range of the preset height, and the height of -0.1 on the Z axis can also be considered to be within the range of the preset height. The range of the preset height in this application can be determined according to actual needs, and this application does not limit the range of the preset height.

[0063] The structure of the force sensing device is exemplarily described below with reference to FIG. 4 and FIG. 5 .

[0064] In some feasible embodiments, the structure of the print head can be as shown in FIG4 , where the print head 40 includes a strain gauge 401, a strain cantilever 402, and a hot end assembly 403. The hot end assembly 403 is connected to one end of the strain cantilever 402, while the other end of the strain cantilever 402 is fixed. The strain gauge 401 is attached to the surface of the strain cantilever 402. When the hot end assembly 403 abuts the print panel, the force applied by the print panel to the hot end assembly 403 is transmitted to the strain cantilever 402, causing the surface of the strain cantilever 402 to deform. If the hot end assembly 403 does not abut the print panel, the surface of the strain cantilever 402 does not deform. Therefore, deformation of the surface of the strain cantilever 402 can be monitored by monitoring whether the amplitude of the signal output by the strain gauge 401 changes, thereby detecting whether the hot end assembly 403 abuts the print panel, that is, whether the print panel is placed on the surface of the hot bed.

[0065] In the present application, when the print head abuts against the print panel, the print head will be subjected to the force exerted by the print panel. Based on the feedback of the force exerted by the print panel on the print head, it is detected whether the print panel is placed on the surface of the hot bed. In the implementation of the present application, strain gauges and strain cantilevers are used for detection, which is low-cost and highly accurate.

[0066] Optionally, in some feasible implementations, the structure of the print head may also be as shown in FIG. 5 , where the print head 50 includes an extrusion wheel 501 , a hot end assembly 502 , and a bracket 503 located between the extrusion wheel 501 and the hot end assembly 502 .

[0067] The bracket 503 is provided with a force sensing device 504 on a side facing the hot end assembly 502 . The force sensing device 504 can sense the distance between the hot end assembly 502 and the bracket 503 .

[0068] When the hot end assembly 502 abuts the printing panel, specifically when the nozzle 5023 in the hot end assembly 502 abuts the printing panel, the heat sink fin 5021 moves toward the side close to the extrusion wheel 501, causing the distance between the hot end assembly 502 and the bracket 503 to change, specifically causing the distance between the heat sink fin 5021 and the bracket 503 to change, causing the signal output by the force sensing device 504 to change.

[0069] Exemplarily, the force sensing device 504 may include a first coil, the plane of which is parallel to the surface of the heat sink fin 5021. The heat sink fin 5021 is a metal conductor, and when the heat sink fin 5021 moves toward the side closer to the extrusion wheel, the magnetic field strength of the first coil changes. Exemplarily, the first coil is connected to the first LC resonant circuit, and the change in the magnetic field strength of the first coil is specifically manifested as a change in the inductance in the first LC resonant circuit, causing the frequency of the signal in the first LC resonant circuit to change. That is, by detecting the change in the signal frequency of the first coil, it is possible to detect whether the printing panel is placed on the surface of the hot bed.

[0070] Optionally, the hot end assembly 502 may further include a silicone sleeve 5022 , which is disposed around the heating unit to prevent heat loss from the heating unit and to prevent a user from being burned when accidentally touching the hot end assembly.

[0071] This embodiment of the present application adds a force sensor device between the bracket and the hot-end assembly. This device monitors the distance between the hot-end assembly and the bracket to determine whether the hot-end assembly is abutting the print panel. This device converts the force exerted by the print panel on the print head into the distance between the hot-end assembly and the bracket to determine whether the hot-end assembly is abutting the print panel, thereby confirming whether the print panel is placed on the surface of the hot bed. This embodiment of the present application offers a simple structure, high design flexibility, high space utilization, and reduced costs.

[0072] Optionally, in some feasible embodiments, the detection device includes a distance measuring sensor device, which can output a continuously changing signal, such as continuously increasing or continuously decreasing, as the print head continues to descend, when a conductor is provided in the target area.

[0073] For example, the printing panel is a conductor and the surface of the hot bed is a non-conductor. In this case, the target area is the projection area of ​​the printing panel in three-dimensional space in a direction perpendicular to the surface of the printing panel, that is, any projection area of ​​the printing panel in the positive direction of the Z axis.

[0074] If the print panel is placed on the surface of the hot bed, the distance sensing device can output a signal that continuously increases or decreases according to the change in the distance between the print head and the print panel. Exemplarily, the distance sensing device includes a second coil, which can be set in the print head, for example, it can be set on the surface of the print head close to the hot bed. The second coil is connected to the second LC resonant circuit. During the descent of the print head, the magnetic field strength of the second coil continuously changes in a certain direction, which is specifically manifested as the inductance in the second LC resonant circuit continuously changing along a certain direction, so that the frequency of the signal in the second LC resonant circuit continuously changes in a certain direction, for example, continuously decreasing. That is, it is possible to detect whether the print panel is placed on the surface of the hot bed by detecting whether the signal frequency of the second coil continuously decreases during the descent of the print head.

[0075] If the printing panel is not placed on the surface of the hot bed, the distance sensor device cannot sense the change in the distance between the print head and the printing panel, and the output signal does not change.

[0076] Alternatively, the printing panel is a non-conductor and the surface of the hot bed is a conductor. In this case, the target area is the projection area of ​​the hot bed in three-dimensional space in the direction perpendicular to the surface of the hot bed, that is, any projection area of ​​the hot bed in the positive direction of the Z axis.

[0077] If the printing panel is placed on the surface of the heated bed, the printing panel blocks the distance sensor device from sensing the distance change between the print head and the heated bed. At this time, the signal output by the distance sensor device does not change.

[0078] If the print panel is not placed on the surface of the heated bed, the distance sensor device can output a signal that continuously increases or decreases according to the distance between the print head and the heated bed. The specific implementation can be the same as the second coil mentioned above, which will not be repeated here.

[0079] An embodiment of the present application also provides a computer program product, which includes a computer program. When the computer program product is run on a computer, it enables the computer to execute the detection method provided by the embodiment of the present application.

[0080] A computer program can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) method. A computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media. Available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media, or semiconductor media (e.g., solid-state drives).

[0081] It should be noted that the above terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0082] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A detection method for a printing panel, characterized in that, The described detection method is applicable to a 3D printer, which includes a heated bed, a print head, and a print panel, and a detection device is provided in the print head; The described detection method includes: Controlling the print head to move to a target area and controlling the print head to descend; During the process of controlling the print head to descend, detecting whether the print panel is placed on the surface of the heated bed according to the signal output by the detection device.

2. The detection method according to claim 1, characterized in that, The detection device includes a force-sensing device; During the process of controlling the print head to descend, detecting whether the print panel is placed on the surface of the heated bed according to the signal output by the detection device includes: When the print head is controlled to descend within a preset height range, if the signal output by the force-sensing device changes, it is detected that the print panel is placed on the surface of the heated bed.

3. The detection method according to claim 1 or 2, characterized in that, The detection device includes a force-sensing device; During the process of controlling the print head to descend, detecting whether the print panel is placed on the surface of the heated bed according to the signal output by the detection device includes: When the print head is controlled to descend within a preset height range, if the signal output by the force-sensing device does not change, it is not detected that the print panel is placed on the surface of the heated bed.

4. The detection method according to claim 2 or 3, characterized in that, Before controlling the print head to move to the target area and controlling the print head to descend, the detection method further includes: Controlling the print head to move to the lowest point of the printing space of the 3D printer; The preset height is the height at the position where the lowest point is located.

5. The detection method according to any one of claims 2-4, characterized in that, The target area is the projection area in three-dimensional space of the suspended part of the print panel relative to the heated bed in the direction perpendicular to the surface of the heated bed.

6. The detection method according to any one of claims 2-5, characterized in that, The force-sensing device is used to change the output signal when the print head is subjected to the force exerted by the print panel.

7. The detection method according to any one of claims 2-6, characterized in that, The print head includes an extrusion wheel, a hot end assembly, and a bracket. The bracket is provided between the extrusion wheel and the hot end assembly, and the force-sensing device is provided on one side of the bracket facing the hot end assembly.

8. The detection method according to claim 1, wherein The detection device includes a distance-sensing device; During the process of controlling the print head to descend, detecting whether the print panel is placed on the surface of the heated bed according to the signal output by the detection device includes: During the process of controlling the print head to descend, detecting whether the print panel is placed on the surface of the heated bed according to whether the signal output by the distance-sensing device continuously increases or continuously decreases.

9. The detection method according to claim 8, characterized in that The print panel is a conductor, and the surface of the heated bed is a non-conductor; Detecting whether the print panel is placed on the surface of the heated bed according to whether the signal output by the distance-sensing device continuously increases or continuously decreases includes: Detecting that the print panel is placed on the surface of the heated bed according to the signal output by the distance-sensing device continuously increasing or continuously decreasing.

10. The detection method according to claim 8 or 9, characterized in that, The target area is the projection area of the print panel in three-dimensional space in the direction perpendicular to the surface of the print panel.

11. The detection method according to claim 8, wherein The print panel is a non-conductor, and the surface of the heated bed is a conductor; Detecting whether the printing panel is placed on the surface of the hot bed according to whether the signal output by the ranging sensor device continuously increases or continuously decreases includes: Detecting that the printing panel is placed on the surface of the hot bed according to that the signal output by the ranging sensor device does not change.

12. The detection method according to claim 8 or 11, characterized in that, The target area is the projection area of the hot bed in three-dimensional space in the direction perpendicular to the surface of the hot bed.

13. A 3D printer, characterized in that, The 3D printer includes a hot bed, a print head, a printing panel, and a controller, and the controller is configured to execute the detection method according to any one of claims 1 to 12.

14. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the detection method according to any one of claims 1 to 12 is implemented.

15. A computer program product, characterized in that, It includes a computer program, wherein when the computer program is executed by a processor, the detection method according to any one of claims 1 to 12 is implemented.

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