Heating device, connecting assembly, printing head and three-dimensional printer

Abstract

The utility model relates to the technical field of 3D printing, in particular to a heating device, a connecting assembly, a printing head and a three-dimensional printer. The heating device is applied to the printing head, the printing head further comprises a nozzle, a discharging channel is formed in the nozzle, the heating device is used for being connected with the nozzle, the heating device comprises at least two feeding channels, and the feeding channels are used for being communicated with the discharging channel. According to the technical scheme, when printing of other colors or consumables is carried out, the consumables do not need to be cut off, and the printing speed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, and in particular to a heating device, a connecting component, a print head and a three-dimensional printer. Background Art

[0002] 3D printing technology uses digital model files and adhesive materials such as powdered metal or plastic as printing materials to construct three-dimensional objects layer by layer. 3D printing technology is a form of rapid prototyping that can produce complex geometries and functional parts. 3D printing technology is rapidly developing, and its applications are expanding, profoundly impacting a wide range of fields, including manufacturing, healthcare, architecture, and art.

[0003] 3D printers include various types, such as FDM (Fused Deposition Modeling) 3D printers. Multi-color printing technology has become the mainstream in FDM printers. Existing multi-color printing technology requires cutting and returning consumables in order to switch between different colors when printing. To switch consumables, the print head must be moved to a specific position so that the print head's cutter is applied with force, thereby cutting the consumables and then returning the cut consumables. This process of cutting the consumables takes a long time, resulting in low printing efficiency. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the purpose of the present invention is to provide a heating device, a connecting component, a print head and a three-dimensional printer that do not need to cut off and return consumables during multi-color printing.

[0005] In the first aspect, the present application provides a print head, which includes a connecting component, a heating device connected to the connecting component, and a nozzle connected to the heating device, the connecting component includes at least two material guide channels, the heating device includes a feed channel corresponding to the material guide channel, the feed channel is connected to the material guide channel, and the nozzle is provided with a discharge channel connected to the feed channel.

[0006] In a second aspect, the present application further provides a three-dimensional printer, which includes the above-mentioned print head.

[0007] The beneficial effects of the utility model are:

[0008] According to the technical solution of the present application, a discharge channel is provided on the nozzle, and a heating device is used to be connected to the nozzle. The heating device includes at least two feed channels, and the feed channel is used to communicate with the discharge channel, so that the molten consumables can enter the discharge channel from the feed channel, so that the consumables in the discharge channel will not affect the entry of the molten consumables in other channels, thereby eliminating the need for special treatment of the first consumable, such as cutting off the consumables. As long as the first consumable does not continue to advance, the advancement of the second consumable can be controlled, thereby quickly realizing the switching of consumables, saving the time of switching consumables, improving the printing speed, and reducing the waste of consumables.

[0009] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the three-dimensional structure of the print head provided in an embodiment of the present application.

[0011] Figure 2 A schematic cross-sectional view of the print head provided in an embodiment of the application.

[0012] Figure 3 A schematic cross-sectional view of the heating device provided in an embodiment of the application.

[0013] Figure 4 A schematic cross-sectional view of the heat dissipation device provided in an embodiment of the application.

[0014] Figure 5 A schematic cross-sectional view of the throat provided in an embodiment of the application.

[0015] Figure 6 A schematic diagram of a partial exploded structure of a print head provided in an embodiment of the present application.

[0016] Figure 7 This is a schematic diagram of the three-dimensional structure of the material changing drive device and the switching device in the embodiment of the present application.

[0017] Figure 8 A schematic diagram of the three-dimensional structure of the active drive device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The following describes preferred embodiments of the present invention in more detail with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0020] It should be understood that although the terms "first", "second", "third", etc. may be used in the present invention to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other.

[0021] Unless otherwise specified, the methods and equipment used in the present invention are all conventional reagents, methods and equipment in the art.

[0022] As attached Figure 1 and 2 As shown, an embodiment of the present application provides a print head 1, which is applied to a three-dimensional printer. The print head 1 is used for multi-color printing. Specifically, the print head 1 can enter consumables of different materials or different colors to advance the target consumable among multiple consumables to print a model using the target consumable.

[0023] The specific number of consumables is not limited. In this application, multiple consumables refer to at least one consumable, such as four consumables.

[0024] The print head 1 includes a housing 50, a consumable drive mechanism 10, a connecting assembly 20, a heating device 30, and a nozzle 40. The consumable drive mechanism 10, the connecting assembly 20, the heating device 30, and the nozzle 40 are respectively directly or indirectly connected to the housing 50. The consumable drive mechanism 10 is used to selectively drive a target consumable among a plurality of consumables forward; wherein, the connecting assembly 20 corresponds to the consumable drive mechanism 10, the connecting assembly 20 is connected to the heating device 30, and the heating device 30 is also connected to the nozzle 40. The connecting assembly 20 includes at least two material guide channels 21, and the heating device 30 includes at least two feed channels 311 corresponding to the material guide channels 21, and the feed channels 311 are connected to the material guide channels 21. The nozzle 40 is provided with a discharge channel 41 connected to the feed channel 311. Among them, one feed channel 311 can be connected to one material guide channel 21.

[0025] During use, the consumable drive mechanism 10 drives the consumable forward, and the consumable passes through the material guide channel 21, the feed channel 311 and the discharge channel 41 in sequence to be ejected from the nozzle 40, thereby printing a model. Since the heating device 30 includes a feed channel 311 corresponding to the material guide channel 21, the number of the material guide channels 21 is at least 2, and the nozzle 40 has a discharge channel 41, different consumables can be melted in the feed channel 311 of the heating block 31, and the target consumable to be used will advance under the action of the consumable drive mechanism 10, so that the melted target consumable will exit the nozzle 40 from the discharge channel 41 of the nozzle 40, thereby printing a model. Other consumables, due to the advancement of the target consumable, will have a force that hinders other consumables from advancing to the discharge channel 41, thereby achieving the purpose of only ejecting the required target consumable from the nozzle 40 and not ejecting other consumables from the nozzle 40. When using other consumables for printing, the consumables currently in use are stopped from moving forward, the new target consumables are moved forward, the mixed color consumables are squeezed out to the location where waste materials are stored, and the new target consumables are continued to be squeezed out, and the model can be printed using the new target consumables. As a result, when printing a model, the print head 1 of the present application does not need to cut off any consumables, nor does it need to return the consumables, thereby saving the time for cutting and returning the consumables and increasing the printing speed of the model. Whatever color or material consumables need to be used for printing, the corresponding consumables can be directly driven forward. There is no need to set a cutter device for cutting consumables on the print head 1, which saves the production cost of the print head 1 and reduces the volume of the print head 1.

[0026] It is understood that, in addition to the solution in which the print head 1 of the present application includes the consumable drive mechanism 10, the consumable drive mechanism 10 may also be disposed outside the print head 1. That is, in the present application, the print head 1 may not include the consumable drive mechanism 10, and when the print head 1 moves, the consumable drive mechanism 10 may not move synchronously with it. In the present application, there is no limitation on whether the print head 1 includes the consumable drive mechanism 10, and the consumable drive mechanism 10 may be disposed according to actual needs.

[0027] In this application, mixed color consumables can also be used to print the support or filling part of the model instead of being squeezed out to the waste storage area to save consumables.

[0028] The heating device 30 is used to heat the consumable material to melt it. The melted consumable material is sprayed onto the printing platform and can be used to form the model. The number of feed channels 311 of the heating device 30 is consistent with the number of material guide channels 21 of the connecting assembly 20 and the total number of consumables that can be used. The number of feed channels 311 is at least two. For example, the number of feed channels 311, the number of material guide channels 21, and the total number of consumables that can be used can be 2, 3, 4, 5, 6, 8, etc.

[0029] The cross-sectional area of ​​the connection between the feed channel 311 and the discharge channel 41 is less than or equal to the cross-sectional area of ​​the discharge channel 41. The specific value is not limited and can be set as needed. For example, the cross-sectional area of ​​the connection between the feed channel 311 and the discharge channel 41 can be less than or equal to one-third of the cross-sectional area of ​​the discharge channel 41. The cross-sectional area of ​​the connection between the feed channel 311 and the discharge channel 41 can be at the end of the feed channel 311 close to the discharge channel 41, or at the end of the discharge channel 41 close to the feed channel 311, or between the feed channel 311 and the discharge channel 41.

[0030] See also Figure 3 , wherein the heating device 30 includes a heating block 31 and a heating element 32, the heating element 32 is connected to the heating block 31 to heat the heating block 31, and the consumables pass through the heating block 31 and contact the heating block 31 to be heated and melted.

[0031] The heating element 32 is a component that generates heat when powered. Specifically, the heating element 32 includes, but is not limited to, a ceramic heating sleeve, a ceramic heating sheet, a heating wire, etc. The heating element 32 can be removably connected to the heating block 31 to facilitate disassembly and maintenance. The heating element 32 can be removably connected to the heating block 31, such as by a snap-fit ​​connection or by securing it with other components, or the heating element 32 can be non-removably connected to the heating block 31, such as by riveting.

[0032] The heating block 31 is a component that is easy to conduct heat, and its material is not limited. It is usually a metal part. Holes or grooves can be opened on the heating block 31 to facilitate the connection or fixation of the heating element 32. The heating channel can be formed by the holes opened on the heating block 31 of the heating device 30. Specifically, at least two feed holes 314 and a through hole 315 connected to the feed hole 314 are opened on the heating block 31 of the heating device 30. The feed hole 314 is connected to the guide channel 21, and the through hole 315 is connected to the discharge channel 41. The consumables enter the feed hole 314 through the guide channel 21, and after being melted, enter the discharge channel 41 through the through hole 315 to be ejected from the discharge channel 41.

[0033] Each feed hole 314 forms at least a portion of the feed channel 311, and at least two feed holes 314 form at least two feed channels 311. The feed hole 314 is connected to the guide channel 21, and the feed hole 314 is used to enter the consumables. The consumables entering the feed hole 314 can be at least partially melted so that the melted consumables can enter the discharge channel 41 through the guide hole 315. The cross-sectional area of ​​the feed channel 311 is generally circular. Optionally, the diameter of the feed channel 311 is 1.3mm-2.5mm. The feed hole 314 extends along a first direction. The first direction is roughly vertical in a three-dimensional printer. Due to installation errors, manufacturing errors, and printer directional flatness, the first direction may not be vertical. The number of feed holes 314 corresponds to the number of guide holes 315.

[0034] The conducting hole 315 is used to connect the feed hole 314 and the discharge channel 41. The conducting hole 315 can be used as the connection part between the feed channel 311 and the discharge channel 41, or the overlapping part of the conducting hole 315 and the feed hole 314 can be used as the connection part between the feed channel 311 and the discharge channel 41.

[0035] The extension direction of the via 315 can be the same as that of the feed hole 314. For example, the via 315 can extend in a first direction to facilitate the movement of the melted consumable material and facilitate the printing of the model. The diameter of the via 315 can be smaller than the diameter of the feed hole 314. Alternatively, the diameter of the via 315 can be less than or equal to half the diameter of the feed hole 314. Alternatively, the feed hole 314 and the via 315 can have the same diameter, thereby ensuring smoother feeding.

[0036] The via 315 and the feed hole 314 overlap in the first direction, and / or the feed hole 314 and the via 315 overlap in the second direction. The first direction is perpendicular to the second direction. It can be understood that the perpendicularity in this application is approximately perpendicular, such as a difference of 87°, 89°, etc., and due to installation errors, processing errors, etc., the second direction may not be absolutely perpendicular to the first direction. The via 315 and the feed hole 314 overlap in the first direction, which can be understood as the projections of the via 315 and the feed hole 314 along the first direction on a plane perpendicular to the first direction overlapping. The feed hole 314 and the via 315 overlap in the second direction, which can be understood as the projections of the via 315 and the feed hole 314 along the second direction on a plane perpendicular to the second direction overlapping. The conductive hole 315 and the feed hole 314 overlap in the first direction, or the feed hole 314 and the conductive hole 315 overlap in the second direction, so that when the conductive hole 315 and the feed hole 314 are opened, their respective holes are opened separately, so that the conductive hole 315 and the feed hole 314 are connected. By controlling the amount of overlap between the two, the cross-sectional area of ​​the connecting portion of the conductive hole 315 and the feed hole 314 can be controlled, so that the area of ​​the connected portion is easy to control, and the processing of the two does not affect each other, the processing precision is low, and it is easy to implement. Optionally, the projection of the conductive hole 315 on the feed hole 314 is less than or equal to one-third of the cross-sectional area of ​​the feed hole 314. Optionally,

[0037] If the feed hole 314 and the guide hole 315 overlap in the first direction, the overlapping size of the feed hole 314 and the guide hole 315 in the first direction is 0.1mm-1mm; if the feed hole 314 and the guide hole 315 overlap in the second direction, the overlapping size of the feed hole 314 and the guide hole 315 in the second direction is 0.1mm-1mm. In the present application, the overlapping size of the feed hole 314 and the guide hole 315 in the first direction and the overlapping size in the second direction are appropriate. The size will not be too large, thereby causing the advancing melted target consumable to enter the feed hole 314 of other consumables, and the size will not be too small, causing the melted target consumable to have difficulty passing through the guide hole 315 into the discharge channel 41. Specifically, the overlapping size of the feed hole 314 and the guide hole 315 in the first direction is 0.3mm-0.8mm; the overlapping size of the feed hole 314 and the guide hole 315 in the second direction is 0.3mm-0.8mm.

[0038] The heating block 31 of the heating device 30 also has a first connection hole 312, which is connected to the conductive hole 315 and is used to connect to the nozzle 40. The first connection hole 312 extends along a first direction, and the projection of the conductive hole 315 on the first connection hole 312 is located within the first connection hole 312. It can be seen that in this application, the size of the first connection hole 312 is larger than the size of the conductive hole 315, and the first connection hole 312 is closer to the end of the heating block 31 than the conductive hole 315. This makes the processing of the first connection hole 312 and the conductive hole 315 easier to achieve.

[0039] The heating block 31 of the heating device 30 further defines a second connection hole 313, which communicates with a feed hole 314 for connecting to the connection assembly 20. The second connection hole 313 extends along the first direction, and the projection of the feed hole 314 on the second connection hole 313 is located within the second connection hole 313.

[0040] It can be seen that in this application, the size of the second connection hole 313 is larger than the size of the feed hole 314, and the second connection hole 313 is closer to the end of the heating block 31 than the feed hole 314, so that the processing of the second connection hole 313 and the feed hole 314 is easier to achieve. In addition, the feed hole 314 and the conductive hole 315 partially overlap, making the entire heating block 31 easier to process and reducing the processing and manufacturing cost of the heating block 31.

[0041] The nozzle 40 can be an existing nozzle 40 and can be removably connected to the heating block 31. For example, a first thread is provided on the inner wall of the first connecting hole 312, and a second thread is provided on a portion of the outer wall of the nozzle 40. The nozzle 40 is removably connected to the heating block 31 through the first connecting hole 312. The material of the nozzle 40 is not limited, and for example, the material of the nozzle 40 can include brass. The discharge channel 41 of the nozzle 40 can be formed by at least a discharge hole formed on the nozzle 40. It is understood that the size of the discharge channel 41 of the nozzle 40 can vary.

[0042] Please also refer to Figure 2 、 Figure 4 and Figure 5 The connection assembly 20 includes a heat sink 22 and a throat 23 connected to the heat sink 22. The throat 23 is also connected to the second connection hole 313 of the heating device 30. The heat sink 22 has at least two first material guide holes 221, and the throat 23 has at least two second material guide holes 231. The first material guide holes 221 correspond to the second material guide holes 231 in number and are in communication with each other. The second material guide holes 231 are configured to correspond to the feed hole 314 of the feed channel 311 and are also in communication with the feed hole 314 to facilitate the advancement of consumables.

[0043] The heat sink 22 is used to dissipate heat from the throat 23. The heat sink 22 is made of a material that easily dissipates heat. The specific material of the heat sink 22 is not limited, and materials for the heat sink 22 include, but are not limited to, brass and aluminum. It is understood that the material of the heat sink 22 is not limited to metal, and this application does not list them one by one. The heat sink 22 may be provided with cooling fins to facilitate heat dissipation.

[0044] The first material guide hole 221 is arranged at an angle to the first direction to facilitate the entry of consumables into the first material guide hole 221. Specifically, the end of the first material guide hole 221 away from the nozzle 40 is the first end, and the end of the first material guide hole 221 closer to the nozzle 40 is the second end. The distance between the first ends of the two first material guide holes 221 can be greater than the distance between the second ends of the two first material guide holes 221. Because the distance between the ends of any two first material guide holes 221 away from the nozzle 40 is greater than the distance between the ends closer to the nozzle 40, the distance between the ends of the two first material guide holes 221 away from the nozzle 40 is greater, leaving more space for connecting components for transporting consumables, such as Teflon tubes or other components that limit the movement of consumables, such as the channel opened in the housing 50.

[0045] The heat sink 22 further has a third connection hole 222 at one end near the nozzle 40. The third connection hole 222 is used to connect to the throat pipe 23. The third connection hole 222 communicates with the first material guide hole 221. The third connection hole 222 and the first material guide hole 221 can be separately provided at both ends of the heat sink 22. The diameter of the third connection hole 222 is larger than that of the first material guide hole 221, so that after the throat pipe 23 is installed, the second material guide hole 231 on the throat pipe 23 corresponds to the first material guide hole 221 of the heat sink 22. The connection method between the heat sink 22 and the throat pipe 23 is not limited and can be detachable or non-detachable, specifically, through threaded connection, jackscrew connection, etc.

[0046] The projection of the first material guide hole 221 on one end of the third connecting hole 222 is located inside the third connecting hole 222, so that after the throat pipe 23 is installed, the first material guide hole 221 can accurately correspond to the second material guide hole 231, and the first material guide hole 221 and the third connecting hole 222 on the heat dissipation device 22 are easy to open.

[0047] The throat pipe 23 extends along the first direction, and the second material guiding hole 231 is arranged along the first direction, which can reduce the volume of the throat pipe 23.

[0048] Please also refer to Figure 6 、 Figure 7 and Figure 8The specific structure of the consumable drive mechanism 10 is not limited, as long as it can drive the consumables forward or backward. The consumable drive mechanism 10 can adopt any existing consumable drive mechanism 10, or a consumable drive mechanism 10 of a new design in the future. It is understood that since the switching of consumables in this application does not require driving the consumables backward, the consumable drive mechanism 10 used in this application may also only have the function of driving the consumables forward, and the consumable drive mechanism 10 may not have the function of driving the consumables backward.

[0049] Optionally, the consumables driving mechanism 10 includes a first driving device 11, a consumables selecting device 12, a second driving device 14, and at least two consumables pressing devices 13, wherein the consumables pressing device 13 is located at least on one side of the second driving device 14, the first driving device 11 is driven and connected to the consumables selecting device 12, and the consumables selecting device 12 is driven and connected to the consumables pressing device 13, so that the target consumables pressing device 13 in the at least two consumables pressing devices 13 and the second driving device 14 selectively clamp the consumables to drive the target consumables forward or backward. Specifically, the first driving device 11 can drive the consumables selecting device 12 to rotate so that the consumables pressing device 13 connected to the consumables selecting device 12 approaches or moves away from the second driving device 14, and the second driving device 14 is used to rotate to drive the target consumables forward or backward.

[0050] The consumable driving mechanism 10 includes a first driving device 11, a consumable selecting device 12, a second driving device 14 and at least two consumable pressing devices 13. The consumable pressing device 13 is located on at least one side of the second driving device 14. The first driving device 11 is driven and connected to the consumable selecting device 12, and the consumable selecting device 12 is driven and connected to the consumable pressing device 13, so that the target consumable pressing device 13 in the at least two consumable pressing devices 13 and the second driving device 14 selectively clamp the consumables to drive the target consumables forward or backward. The present application has only one second driving device, which can selectively clamp the target consumables with different consumable pressing devices to drive the target consumables forward or backward, reducing the number of second driving devices, resulting in a simple structure of the consumable driving mechanism and reducing the volume of the consumable driving mechanism.

[0051] It is understood that a consumable drive mechanism 10 having the same structure as that of the present application may not have the function of driving the consumables backward, because the forward and backward movement of the consumables is a control function of the consumable drive mechanism 10, rather than a structural function. For example, driving the second drive device 14 forward or reverse can achieve the forward or backward movement of the consumables. In the present application, the correspondence between forward rotation and the forward or backward movement of the consumables is not limited.

[0052] In this embodiment, the number of consumables clamping devices 13 is not limited. The number of consumables clamping devices 13 is the same as the number of consumables. Each consumables clamping device 13 is used to clamp a consumable so that the second drive device 14 drives the consumable forward or backward. For example, the print head 1 includes four consumables clamping devices 13, two of which are located on one side of the second drive device 14, and the other two are located on the other side of the second drive device 14. Such a layout can save space and improve space utilization. More consumables clamping devices 13 can be accommodated in a limited space, which is conducive to the miniaturization of the print head 1 and does not affect the arrangement of other components, such as the connection assembly 20. Optionally, the consumables drive mechanism 10 includes at least four first drive devices, at least two of which are located on one side of the second drive device 14, and at least two of which are located on the other side of the second drive device 14.

[0053] It is understood that the number of consumable material pressing devices 13 and the local position of the consumable material pressing devices 13 are for exemplary purposes only and do not limit the number and layout. As in other embodiments, the four consumable material pressing devices 13 can be arranged in a row and all arranged on the same side of the second drive device.

[0054] The consumables clamping device 13 includes a passive roller 131, a rotating link 132, and an elastic element 133. The rotating link 132 can be movably connected to the housing 50. The passive roller 131 is rotatably connected to the rotating link 132. The elastic element 133 is connected to the housing 50 and the rotating link 132 respectively. The elastic element 133 is used to apply force to the rotating link 132 to approach the second drive device 14, so that the passive roller 131 and the second drive device 14 clamp the consumables. In this application, connection includes abutment.

[0055] The structure of the passive roller 131 is not limited, as long as the passive roller 131 can contact the consumables and can clamp the consumables with the second drive device 14. Exemplarily, a first groove for accommodating the consumables is provided on the passive roller 131, and the side wall of the first groove can be roughened to increase the friction between the consumables and the passive roller 131. For example, grooves can be provided on the side wall of the first groove, and the grooves are arranged along the circumference of the passive roller 131. The number of passive rollers 131 included in each consumable pressing device 13 is not limited, such as including one or more passive rollers 131. In the embodiment of the present application, each consumable pressing device 13 can include a passive roller 131, and the print head 1 includes four passive rollers 131, two passive rollers 131 are located on one side of the second drive device 14, and the other two passive rollers 131 are located on the other side of the second drive device 14, so that the passive rollers on the same side of the second drive device 14 are arranged side by side.

[0056] The structure and type of the elastic element 133 are not limited. For example, the elastic element 133 may be a torsion spring, a spring, elastic silicone, etc. The number of elastic elements 133 is also not limited. A consumable material pressing device 13 may include one or more elastic elements 133, as long as the elastic element 133 can provide a force to move the rotating connecting rod 132 toward the second driving device 14. In the embodiment of the present application, the elastic element 133 is a torsion spring, and each consumable material pressing device 13 includes only one torsion spring, which is respectively connected to the rotating connecting rod 132 of the housing 50.

[0057] The rotating link 132 includes a rotating portion 1321 and a connecting portion 1322. The rotating portion 1321 and the connecting portion 1322 are connected. The end of the rotating portion 1321 away from the connecting portion 1322 is rotatably connected to the housing 50. The passive roller 131 is connected to the end of the connecting portion 1322 closer to the rotating portion 1321. The elastic element 133 is connected to the housing 50 and the connecting portion 1322, respectively. The end of the rotating portion 1321 away from the connecting portion 1322 is rotatably connected to the housing 50, and the passive roller 131 is connected to the end of the connecting portion 1322 closer to the rotating portion 1321. This allows the passive roller 131 to protrude toward the second drive mechanism 14, thereby preventing the rotating portion 1321 and the connecting portion 1322 from interfering with the second drive mechanism 14. The end of the rotating portion 1321 away from the connecting portion 1322, i.e., the position on the rotating portion 1321 at a distance greater than half the length of the rotating portion 1321, is located away from the connecting portion 1322. The connection portion 1322 is close to one end of the rotating portion 1321 , that is, a position on the connection portion 1322 at a distance from the rotating portion 1321 that is less than half of the length of the connection portion 1322 .

[0058] The rotating portion 1321 and the connecting portion 1322 may be integrally formed. The specific material of the rotating portion 1321 and the connecting portion 1322 is not limited, for example, the rotating portion 1321 and the connecting portion 1322 may be made of plastic or metal.

[0059] An abutment portion 1323 is provided on the connecting portion 1322 of the rotating connecting rod 132. The abutment portion 1323 is used to abut against the consumable selection device 12. The consumable selection device 12 is used to push the abutment portion 1323 away from the consumable selection device 12, or to make way for the abutment portion 1323, so that the abutment portion 1323, the rotating connecting rod 132 and the passive roller 131 are close to the second driving device 14. The abutment portion 1323 can protrude toward the consumable selection device 12. The shape of the abutment portion 1323 is not limited. In the present application, the abutment portion 1323 is rod-shaped, and the end of the abutment portion 1323 close to the consumable selection device 12 is smoothed to facilitate the consumable selection device 12 to push the abutment portion 1323, such as the end of the abutment portion 1323 close to the consumable selection device 12 is arc-shaped. The abutment portion 1323 can be integrally formed with the connecting portion 1322. The material of the abutting portion 1323 is not limited. For example, the abutting portion 1323 can be made of plastic.

[0060] A rotating shaft 51 may be protruded from the housing 50 so that the rotating portion 1321 of the rotating link 132 of the consumables pressing device 13 is rotatably connected to the rotating shaft 51 , that is, the rotating portion 1321 is connected to the rotating shaft of the rotating portion 1321 .

[0061] The consumable material selection device 12 is used to enable the passive roller 131 and the second drive device 14 to clamp the consumable material at one time, such as clamping one or two consumable materials at one time. In the embodiment of the present application, the consumable material selection device 12 is used to enable the passive roller 131 and the second drive device 14 to clamp at most one consumable material at one time. The consumable material selection device 12 is provided with a switching groove 121 arranged in the circumferential direction, and the switching groove 121 is used to make way for the abutment portion 1323, so that the abutment portion 1323, the connecting portion 1322 and the passive roller 131 can be close to the second drive device 14, so that the passive roller 131 and the second drive device 14 can clamp the consumable material. The material of the consumable material selection device 12 is not limited, such as the material of the consumable material selection device 12 can be plastic or metal.

[0062] The specific structure of the switching groove 121 is not limited, such as the shape of the switching groove 121 matches the abutment portion. In the present application, the cross-sectional shape of the switching groove 121 is arc-shaped, so that the consumable selection device 12 can rotate and realize the contact and separation of the abutment portion 1323 with the groove wall of the switching groove 121. The switching groove 121 is arranged along the circumferential direction, that is, the switching groove 121 is staggered, and the projections of different switching grooves 121 on the cross section of the consumable selection device 12 are located at different positions, so that at any moment, only one consumable pressing device 13 clamps the consumables. The switching groove 121 can be distributed on different planes; thus, the consumable pressing devices 13 can be distributed on different planes, which can improve space utilization. At least one switching groove 121 is distributed on each plane. In the present application, a switching groove is distributed in each plane to drive at least two consumable pressing devices 13 arranged on one plane.

[0063] If the print head 1 includes at least four consumable material clamping devices 13, the consumable material selection device 12 is provided with at least two switching slots 121, and the switching slots 121 are distributed on at least two planes, with at least one switching slot 121 provided on each plane. In one embodiment, the number of switching slots 121 is two. The positions of the switching slots can be reasonably arranged so that the consumable material clamping devices 13 can be adjusted to five gear positions, namely, one position is neutral. In the neutral state, none of the consumable material clamping devices 13 and the second drive device 14 will clamp the consumable material.

[0064] See also Figure 4The first driving device 11 is used to drive the consumable material selection device 12 to rotate. The specific structure of the first driving device 11 is not limited, as long as it can drive the consumable material selection device 12 to rotate.

[0065] Specifically, the first driving device 11 includes a first motor 111, a worm 112 and a worm gear 113, the worm 112 is connected to the first motor 111, the worm gear 113 is drivingly connected to the worm 112, and the worm gear 113 is coaxially connected to the consumable selection device 12; or,

[0066] The first driving device 11 includes a first motor 111, a first gear and a second gear. The first gear is driven and connected to the first motor 111, and the second gear is driven and connected to the first gear. The diameter of the second gear is larger than the diameter of the first gear. The second gear is coaxially connected to the consumable selection device 12, and the diameter of the second gear is larger than the diameter of the consumable selection device 12.

[0067] The above two structures of the first driving device 11 are exemplary descriptions of the embodiments of the present application and do not limit the specific structure of the first driving device 11.

[0068] See also Figure 5 The second driving device 14 includes a driving mechanism (not numbered) and a driving roller 141 connected to the driving mechanism. The driving roller 141 is used to clamp the consumables with the consumables pressing device 13.

[0069] The specific structure of the driving mechanism is not limited, and it can drive the driving roller 141 to rotate. For example, the driving mechanism includes a second motor 142, a motor drive wheel 143 drivingly connected to the second motor 142, and a reduction roller 144 drivingly connected to the motor drive wheel 143, wherein the diameter of the reduction roller 144 is larger than the diameter of the motor drive wheel 143, the reduction roller 144 is coaxially connected to the driving roller 141, and the diameter of the reduction roller 144 is larger than the diameter of the driving roller 141.

[0070] The specific structure of the active roller 141 is not limited, as long as it can contact the consumables and clamp the consumables with the passive roller 131. For example, the active roller 141 can be provided with a second groove for accommodating the consumables. The sidewalls of the second groove can be roughened to increase the friction between the consumables and the active roller 141. For example, the sidewalls of the second groove can be provided with grooves, and the grooves are arranged along the circumference of the passive roller 131.

[0071] The second driving device 14 includes at least two active rollers 141. Different active rollers 141 are located on different planes. In the embodiment of the present application, at least two active rollers 141 are coaxially connected to the deceleration roller 144 of the driving mechanism to achieve the same angle rotation.

[0072] Each active roller 141 corresponds to at least one consumable material pressing device 13, that is, each active roller 141 corresponds to at least one passive roller 131. In the embodiment of the present application, each active roller 141 corresponds to two consumable material pressing devices 13, that is, each active roller 141 corresponds to two passive rollers 131. A consumable material pressing device 13 is provided on each side of the active roller 141, that is, two consumable material pressing devices 13 are provided on both sides of the active roller 141. If the print head 1 includes four consumable material pressing devices 13, then the print head 1 includes two active rollers 141.

[0073] Optionally, the connecting assembly 20 further includes a connecting device 24 , which is provided with a plurality of third material guide holes 241 . The third material guide holes 241 correspond to the consumables passing through the consumable driving mechanism 10 , and the third material guide holes 241 also correspond one-to-one to the first material guide holes 221 .

[0074] The specific structure of the connecting device 24 is not limited. The connecting device 24 can be connected to the housing 50. Alternatively, the connecting device 24 can be integrally formed with the housing 50. In other embodiments, the connecting device 24 is a consumable guide tube. The distance between the connecting device 24 and the heat sink 2223 is 0.1 mm to 5 mm, that is, there is a gap between the connecting device 24 and the heat sink 2223.

[0075] The print head 1 may also include an elastic connector connected to the housing 50 and a force sensor disposed on the elastic connector. The heat sink is connected to the housing 50 via an elastic element 133. When the nozzle 40 assembly 30 of the print head 1 contacts the printing platform of the 3D printer, the elastic connector deforms, allowing the force sensor to sense the deformation of the elastic connector and thus detect contact between the nozzle 40 assembly 30 and the printing platform, thereby facilitating leveling of the 3D printer. A gap is provided between the connecting device 24 and the heat sink 2223 to facilitate deformation of the elastic connector.

[0076] The print head 1 may further include a material-break detection device, which is disposed at one end of the consumables drive mechanism 10 away from the nozzle 40 assembly 30; and / or

[0077] The print head 1 also includes a material blockage detection device, which is arranged at one end of the consumable drive mechanism 10 away from the nozzle 40 assembly 30. The specific structure of the material breakage detection device or the material blockage detection device is not limited in this application, and it only needs to be able to detect material breakage or blockage of the consumable.

[0078] The present application also provides a three-dimensional printer, which includes the above-mentioned print head 1 and has all the functions and advantages of the above-mentioned print head 1.

[0079] Label 1, the present application also provides a heating device 30, the heating device 30 is applied to the print head 1, the print head also includes a nozzle 40, the nozzle 40 is provided with a discharge channel 41, the heating device 30 is used to connect with the nozzle 40, the heating device 30 includes at least two feed channels 311, the feed channel 311 is used to communicate with the discharge channel 41.

[0080] Label 2, based on label 1, the cross-sectional area of ​​the connection portion between the feed channel 311 and the discharge channel 41 is less than or equal to one third of the cross-sectional area of ​​the discharge channel 41.

[0081] Reference numeral 3, based on reference numeral 1, the heating device 30 is provided with at least two feed holes 314 and a conducting hole 315 communicating with the feed holes 314, and the projection of the conducting hole 315 on the feed hole 314 is less than or equal to one third of the cross-sectional area of ​​the feed hole 314;

[0082] The conducting hole 315 is used to communicate with the discharge channel 41 .

[0083] Reference numeral 4, based on reference numeral 3, the feed hole 314 and the conducting hole 315 extend in the same direction.

[0084] Reference numeral 5, based on reference numeral 4, the feed hole 314 and the conducting hole 315 both extend along the first direction, and the second direction is perpendicular to the first direction;

[0085] The feed hole 314 and the via hole 315 overlap in the first direction, and / or the feed hole 314 and the via hole 315 overlap in the second direction.

[0086] Label 6, based on label 5, if the feed hole 314 and the guide hole 315 overlap in the first direction, the overlapping size of the feed hole 314 and the guide hole 315 in the first direction is 0.1mm-1mm; if the feed hole 314 and the guide hole 315 overlap in the second direction, the overlapping size of the feed hole 314 and the guide hole 315 in the second direction is 0.1mm-1mm.

[0087] Reference number 7, based on reference number 6, the overlapping dimension of the feed hole 314 and the conductive hole 315 in the first direction is 0.3mm-0.8mm; the overlapping dimension of the feed hole 314 and the conductive hole 315 in the second direction is 0.3mm-0.8mm.

[0088] Reference numeral 8, based on reference numeral 5, a first connecting hole 312 is further provided on the heating device 30, the first connecting hole 312 is connected to the conducting hole 315, and the first connecting hole 312 is used to connect the nozzle 40; the conducting hole 315 and the discharge channel 21 have the same diameter.

[0089] Reference numeral 9 , based on reference numeral 8 , a second connecting hole 313 is further provided on the heating device 30 , and the second connecting hole 313 is communicated with the feed hole 314 .

[0090] Reference numeral 10, based on reference numeral 9, the first connection hole 312 extends along the first direction, and the projection of the conductive hole 315 on the first connection hole 312 is located inside the first connection hole 312;

[0091] The second connecting hole 313 extends along the first direction, and a projection of the feeding hole 314 on the second connecting hole 313 is located inside the second connecting hole 313 .

[0092] Reference numeral 11 , based on reference numeral 3 , the heating device 30 includes a heating block 31 and a heating element 32 . The heating element 32 is connected to the heating block 31 . A feed hole 314 and a conducting hole 315 are provided on the heating block 31 .

[0093] Label 12, the present application also provides a connecting component 20, which is used to connect to the heating device 30 of any one of labels 1-11, and the connecting component 20 includes at least two material guide channels 21, which are used to correspond to the feed channel 311.

[0094] Label 13, based on label 12, the connecting device includes a throat pipe 23, which is used to connect with the heating device 30, and at least two second material guide holes 231 are opened on the throat pipe, and the second material guide holes 231 are used to correspond to the feed channel 311, and the second material guide holes 231 are used to communicate with the feed channel 311.

[0095] Reference numeral 14 , based on reference numeral 13 , the second material guide hole 231 is provided along a first direction, and the first direction is the axial direction of the throat pipe 23 .

[0096] Reference numeral 15, based on reference numeral 14, the connection assembly 20 further includes a heat dissipation device 22, the heat dissipation device 22 is connected to the throat 23, at least two first material guide holes 221 are provided on the heat dissipation device 22, the number of the first material guide holes 221 corresponds to the number of the second material guide holes 231, and the first material guide holes 221 are connected to the second material guide holes 231.

[0097] Reference numeral 16, based on reference numeral 15, the first material guiding hole 221 is arranged at an angle to the first direction.

[0098] Reference numeral 17 , based on reference numeral 15 , a third connecting hole 222 is further provided on the heat dissipation device 22 . The third connecting hole 222 is used to connect with the throat pipe 23 , and the first material guide hole 221 is in communication with the third connecting hole 222 .

[0099] Reference numeral 18 , based on reference numeral 17 , a projection of one end of the first material guiding hole 221 close to the third connecting hole 222 on the third connecting hole 222 is located inside the third connecting hole 222 .

[0100] Label 19, based on label 17, the end of the first material guide hole 221 away from the nozzle 40 is the first end, the end of the first material guide hole 221 close to the nozzle 40 is the second end, and the distance between the first ends of the two first material guide holes 221 is greater than the distance between the second ends of the two first material guide holes 221.

[0101] Reference number 20 , the present application further provides a print head 1 , which includes a heating device 30 of any one of reference numbers 1-11 , or a connecting assembly 20 of any one of reference numbers 12-19 .

[0102] Reference number 21 , the present application further provides a three-dimensional printer, which includes a heating device 30 of any one of reference numbers 1-11, or a connecting assembly 20 of any one of reference numbers 12-19, or a print head 1 of reference number 20 .

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A heating device, characterized in that: The heating device is applied to a print head, which also includes a nozzle, and a discharge channel is provided on the nozzle. The heating device is used to be connected to the nozzle, and the heating device includes at least two feed channels, and the feed channels are used to communicate with the discharge channel.

2. The heating device according to claim 1, characterized in that The cross-sectional area of ​​the connection portion between the feed channel and the discharge channel is less than or equal to one third of the cross-sectional area of ​​the discharge channel.

3. The heating device according to claim 1, characterized in that The heating device is provided with at least two feed holes and conducting holes communicating with the feed holes, wherein the projection of the conducting holes on the feed holes is less than or equal to one third of the cross-sectional area of ​​the feed holes; The conducting hole is used to communicate with the discharge channel.

4. The heating device according to claim 3, characterized in that The feed hole and the conducting hole extend in the same direction.

5. The heating device according to claim 4, characterized in that The feed hole and the conducting hole both extend along a first direction; The feed hole and the conducting hole overlap in a first direction, and / or the feed hole and the conducting hole overlap in a second direction, and the second direction is perpendicular to the first direction.

6. The heating device according to claim 5, characterized in that If the feed hole and the conductive hole overlap in the first direction, the overlapping size of the feed hole and the conductive hole in the first direction is 0.1mm-1mm; if the feed hole and the conductive hole overlap in the second direction, the overlapping size of the feed hole and the conductive hole in the second direction is 0.1mm-1mm.

7. The heating device according to claim 6, characterized in that The overlapping dimension of the feed hole and the conductive hole in the first direction is 0.3 mm to 0.8 mm; the overlapping dimension of the feed hole and the conductive hole in the second direction is 0.3 mm to 0.8 mm.

8. The heating device according to claim 5, characterized in that The heating device is further provided with a first connecting hole, which is communicated with the conducting hole and is used to connect the nozzle; the conducting hole and the discharge channel have the same diameter.

9. The heating device according to claim 8, characterized in that The heating device is further provided with a second connecting hole, which is communicated with the feeding hole.

10. The heating device according to claim 9, characterized in that The first connecting hole extends along a first direction, and a projection of the conducting hole on the first connecting hole is located inside the first connecting hole; The second connecting hole extends along the first direction, and the projection of the feeding hole on the second connecting hole is located inside the second connecting hole.

11. The heating device according to claim 3, characterized in that The heating device includes a heating block and a heating element, the heating element is connected to the heating block, and the heating block is provided with the feed hole and the conducting hole.

12. A connection assembly, characterized in that: The connecting assembly is used to be connected to the heating device according to any one of claims 1 to 11, and the connecting assembly includes at least two material guiding channels, and the material guiding channels are used to correspond to the feed channels.

13. The connection assembly according to claim 12, characterized in that The connecting device includes a throat pipe, which is used to connect to the heating device. At least two second material guide holes are opened on the throat pipe, and the second material guide holes are used to correspond to the feed channel, and the second material guide holes are used to communicate with the feed channel.

14. The connection assembly according to claim 13, wherein: The second material guiding hole is arranged along a first direction, and the first direction is the axial direction of the throat pipe.

15. The connection assembly according to claim 14, characterized in that The connecting assembly also includes a heat dissipation device, which is connected to the throat. At least two first material guide holes are opened on the heat dissipation device. The number of the first material guide holes corresponds to the number of the second material guide holes, and the first material guide holes are connected to the second material guide holes.

16. The connection assembly according to claim 15, characterized in that The first material guiding hole is arranged at an angle to the first direction.

17. The connection assembly according to claim 15, characterized in that The heat dissipation device is further provided with a third connecting hole, which is used to be connected to the throat pipe, and the first material guide hole is communicated with the third connecting hole.

18. The connection assembly according to claim 17, wherein: The projection of one end of the first material guiding hole close to the third connecting hole on the third connecting hole is located inside the third connecting hole.

19. The connection assembly according to claim 17, wherein: The end of the first material guide hole away from the nozzle is the first end, the end of the first material guide hole close to the nozzle is the second end, and the distance between the first ends of the two first material guide holes is greater than the distance between the second ends of the two first material guide holes.

20. A print head, characterized in that: The print head comprises the heating device according to any one of claims 1 to 11, or comprises the connecting assembly according to any one of claims 12 to 19.

21. A three-dimensional printer, characterized in that: The three-dimensional printer includes the heating device according to any one of claims 1 to 11, or the connecting assembly according to any one of claims 12 to 19, or the print head according to claim 20.

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