Transmission device and 3D printer

Abstract

The utility model relates to the technical field of 3D printing, aims to solve the technical problem of low printing precision of a printed piece, and provides a transmission device and a 3D printer. The transmission device comprises a transmission assembly, a movable assembly, a detection assembly and a leveling detection piece. The length direction of the transmission assembly is parallel to the second direction, and the second direction intersects with the first direction. The movable assembly is movably arranged on the transmission assembly in the second direction and used for being connected with the printing platform or the printing head. The detection assembly comprises a first detection piece and a second detection piece, the first detection piece is arranged on the transmission assembly, and the first detection piece extends in the length direction of the transmission assembly. The second detection member is used for detecting position information relative to the first detection member. The leveling detection piece is arranged on the transmission assembly or the movable assembly and used for detecting the distance between each position of the movable assembly on the transmission assembly and the printing platform in the first direction. The method has the beneficial effect that the printing precision and the printing efficiency are improved.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and more particularly, to a transmission device and a 3D printer. Background Art

[0002] A 3D printing device usually extrudes a consumable onto a printing platform through a print head and obtains a printed part by layer-by-layer printing.

[0003] In the known art, the print head is slidably disposed on the X-axis drive assembly along the X direction. The position accuracy of the print head on the X-axis drive assembly and the position accuracy between the print head and the printing platform both affect the forming accuracy, dimensional accuracy, and other printing qualities of the printed part. Summary of the Utility Model

[0004] This application provides a transmission device and a 3D printer to solve the technical problem of low printing quality of printed parts. In a first aspect, this application provides a transmission device for a 3D printer. The 3D printer has a printing area defined by a printing platform and a print head. The transmission device includes a transmission component, a movable component, and a detection component. The transmission component extends along a first direction. The movable component is movably disposed on the transmission component. The detection component includes a first detection member and a second detection member. The first detection member is disposed on the transmission component along the first direction, and the second detection member is disposed on the movable component. Wherein, the detection component is configured to detect the position information of the second detection member relative to the first detection member to obtain the displacement information of the movable component in the first direction.

[0005] The transmission device of this application is applied to a 3D printer. By detecting the real-time displacement information of the movable component on the transmission component through the detection component and comparing it with the preset position information of the movable component, the position of the movable component on the transmission component can be adjusted to the preset position information according to the difference between the real-time displacement information and the preset displacement information, thereby improving the position accuracy of the print head relative to the printing platform in the XY plane during the printing process and improving the printing accuracy of each point in the XY plane. This transmission device can perform real-time positioning of the spatial position of the print head relative to the printing platform during the printing process, ensure that the actual spatial position of the print head is consistent with the preset spatial position, and ultimately improve the forming accuracy, dimensional accuracy, and surface quality of the printed part.

[0006] In a possible implementation:

[0007] The transmission component has a mounting surface extending along the first direction. The first detection member is disposed on the mounting surface, and the second detection member is disposed facing the first detection member.

[0008] In a possible implementation:

[0009] The first detection member includes a magnetic grating bar disposed on the transmission component, and the second detection member includes a magnetic head disposed on the movable component, and the magnetic head is configured to convert the magnetization signal of the magnetic grating bar into an electrical signal.

[0010] In one possible implementation:

[0011] The detection component also includes a third detection member, which is disposed on the transmission component or the movable component, and is configured to detect the distance between the third detection member and the printing platform in the printing area.

[0012] In one possible implementation:

[0013] The printing area has a first side and a second side disposed opposite to each other. The third detection member is disposed on the transmission assembly, and the scanning surface or scanning line projection of the third detection member on the printing platform extends from the first side to the second side.

[0014] In one possible implementation:

[0015] The transmission assembly has a mounting surface facing the printing platform, and the third detection member is mounted on the mounting surface; the third detection member includes a housing and a plurality of detectors, and the plurality of detectors are distributed in the housing in the length direction of the housing, and the housing has a detection surface facing away from the mounting surface. The plurality of detectors are used to send detection signals, and the detection signals are configured to pass through the detection surface to reach the printing platform, so as to detect the distance between the detector and the printing platform in the printing area.

[0016] In one possible implementation:

[0017] The third detection member also includes an annular baffle, which is convexly arranged on the surface of the housing close to the printing platform, and the detection surface is located on the inner side of the annular baffle.

[0018] In one possible implementation:

[0019] The transmission assembly has a mounting surface facing the printing platform, the mounting surface is provided with a mounting groove, the length direction of the mounting groove is parallel to the first direction, and the third detection member is installed in the mounting groove.

[0020] In one possible implementation:

[0021] The transmission device further includes a transmission belt, a first transmission wheel, and a second transmission wheel. The first transmission wheel is rotatably connected to one end of the transmission assembly in the length direction, and the second transmission wheel is rotatably connected to the other end of the transmission assembly in the length direction. The transmission belt is wound around the first transmission wheel and the second transmission wheel, and the movable assembly is fixedly connected to the transmission belt.

[0022] In a second aspect, the present application provides a 3D printer, including the aforementioned transmission device and a printing platform. The printing platform is disposed on one side of the transmission device along a first direction, and the printing platform can move relative to the transmission device along the first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of a 3D printer according to an embodiment of the present application.

[0025] Figure 2 It is a schematic structural diagram of a transmission device according to an embodiment of the present application.

[0026] Figure 3 For Figure 2 the exploded structural diagram of the transmission device in

[0027] Figure 4 For Figure 2 the structural diagram of the transmission device from another perspective in

[0028] Figure 5 For Figure 2 the cross-sectional view of the transmission device perpendicular to the second direction in

[0029] Figure 6 For Figure 2 the cross-sectional view of the transmission device perpendicular to the first direction in

[0030] Figure 7 For Figure 2 the cross-sectional view of the transmission device perpendicular to the third direction in

[0031] Figure 8 For Figure 7 the enlarged partial structural diagram at I in

[0032] Figure 9 For Figure 7 the enlarged partial structural diagram at II in

[0033] Figure 10 Schematic structural diagram of a transmission device according to another embodiment of the present application.

[0034] Figure 11 Schematic structural diagram of a 3D printer according to another embodiment of the present application.

[0035] Figure 12 Schematic structural diagram of a 3D printer according to another embodiment of the present application.

[0036] Figure 13 Schematic structural diagram of a 3D printer according to another embodiment of the present application.

[0037] Description of main element symbols:

[0038]

[0039]

[0040] Detailed implementation manners

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. When an element is considered to be "disposed on" another element, it can be directly disposed on the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific implementation manners, and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0044] Some implementation manners of the present application will be described in detail. Without conflict, the following implementation manners and the features in the implementation manners can be combined with each other.

[0045] Embodiment 1

[0046] Figures 1 - 10 Fig. 2 shows a 3D printer 200 in an embodiment of the present application. The 3D printer 200 is, for example, a 3D printer 200 based on FDM (Fused Deposition Modelling) technology.

[0047] Refer to Figure 1 , the 3D printer 200 provided in this embodiment includes a printing platform 207, a base 205, a frame 206, an X-axis driving component 201, a first Y-axis driving component 202, a Z-axis driving component 204, and a print head 208.

[0048] The first Y-axis driving component 202 is connected to the base 205. The printing platform 207 is used to carry the printed part. The printing platform 207 is connected to the first Y-axis driving component 202 and is used to displace along the Y direction under the drive of the first Y-axis driving component 202. The frame 206 is erected on the base 205. The frame 206 includes two support columns. The two support columns are spaced along the X direction on the base 205. The Z-axis driving component 204 is connected to at least one of the support columns. The support column serves as the support of the Z-axis driving component 204. The frame 206 can be set as a gantry. The X-axis driving component 201 is connected to the Z-axis driving component 204 and is used to displace along the Z direction under the drive of the Z-axis driving component 204. The print head 208 is used to print the molten printing consumables (such as ABS, etc.) on the printing platform 207 to form a printed part. The print head 208 is connected to the X-axis driving component 201 and is used to displace along the X-axis under the drive of the X-axis driving component 201. Among them, the X direction, the Y direction, and the Z direction are perpendicular to each other in pairs. In other embodiments, the X direction, the Y direction, and the Z direction can also be obliquely intersecting with each other in pairs. For example, when the frame 206 of the 3D printer 200 is a triangular prism-shaped frame, the X direction is obliquely intersecting with the Y direction, the Z direction is obliquely intersecting with the Y direction, and the Z direction is obliquely intersecting with the X direction. In other embodiments, the 3D printer 200 can also be set as an integral 3D printer, a single-cantilever 3D printer, an infinite Z-axis 3D printer, or a delta 3D printer, etc. Therefore, the type of the 3D printer in this embodiment can be adjusted according to actual needs, and the positions of the X direction, the Y direction, and the Z direction in the three-dimensional space can also be adjusted accordingly according to different types of 3D printers.

[0049] Optionally, the print head 208 adopts an integrated proximal extrusion mechanism, integrating the extruder, leveling, heating component, optical module, cooling component, and material breakage detection into one, solving the problem of poor stability of multiple modules, improving the integrity of the product, and solving the problems of small extrusion force in remote printing and inability to print flexible consumables.

[0050] When the 3D printer 200 of this embodiment is in use, the consumable is supplied to the print head 208 and melted by heating of the print head 208. The print head 208 is displaced under the drive of the X-axis drive assembly 201. Combining with the displacement of the print platform 207 along with the first Y-axis drive assembly 202, the melted printing consumable prints a printing layer on the XY plane. Subsequently, it is displaced under the drive of the Z-axis drive assembly 204 along with the print head 208, and each printing layer is stacked and connected in the Z direction to form a printed part.

[0051] This embodiment further provides a transmission device 100, which can be used as one or more of the foregoing X-axis drive assembly 201, first Y-axis drive assembly 202, and Z-axis drive assembly 204.

[0052] For example, in this embodiment, the X-axis drive assembly 201 adopts this transmission device 100, while the first Y-axis drive assembly 202 and the Z-axis drive assembly 204 adopt other structural forms. In addition, in this embodiment, the second direction M2 is parallel to the X direction.

[0053] See Figure 1 and Figure 2 , the transmission device 100 of this embodiment (such as the X-axis drive assembly 201 in this embodiment) is used to drive the print head 208 to displace in the X direction.

[0054] Cooperate with and see Figure 2 and Figure 3 , the transmission device 100 includes a transmission component 10, a movable component 20, and a detection component 30. The length direction of the transmission component 10 is parallel to the second direction M2, and the second direction M2 intersects the first direction M1. The movable component 20 is movably arranged on the transmission component 10 along the second direction M2, and the movable component 20 is used to connect the print head 208. The detection component 30 includes a first detection piece 31 and a second detection piece 32. The first detection piece 31 is arranged on the transmission component 10, and the first detection piece 31 extends from one end of the length direction of the transmission component 10 to the other end of the length direction of the transmission component 10; the second detection piece 32 is arranged on the movable component 20, and the second detection piece 32 is used to detect the position information relative to the first detection piece 31 to obtain the displacement information of the movable component 20 on the transmission component 10 along the second direction M2.

[0055] The transmission device 100 of this embodiment is applied to the 3D printer 200. The print head 208 is installed on the movable component 20. By detecting the real-time displacement information of the movable component 20 on the transmission component 10 through the detection component 30 and comparing it with the preset position information of the movable component 20, in this way, the position of the movable component 20 on the transmission component 10 can be adjusted to the preset position information according to the difference between the real-time displacement information and the preset displacement information, thereby improving the position accuracy of the print head 208 relative to the print platform 207 on the XY plane during the printing process and improving the printing accuracy of each point on the XY plane.

[0056] Thus, by adopting the transmission device 100 for the X-axis drive assembly 201 in this embodiment, the spatial position of the print head 208 can be positioned in real time during the printing process, ensuring that the actual spatial position of the print head 208 is consistent with the preset spatial position, and ultimately improving the forming accuracy, dimensional accuracy and surface quality of the printed part.

[0057] In this embodiment, the length direction of the first detection member 31 is parallel to the second direction M2, thereby improving the installation stability of the first detection member 31 on the transmission assembly 10 and improving the detection accuracy.

[0058] In this embodiment, refer to Figure 3 and Figure 4 , the first detection member 31 includes a magnetic grating bar 31a, the length direction of the magnetic grating bar 31a is parallel to the second direction M2, and the second detection member 32 includes a magnetic head 32a.

[0059] Cooperate with reference to Figure 4 , the magnetic grating bar 31a is provided with a plurality of magnetic signal cells 311 (also seen in Figure 8 and Figure 9 ), the plurality of magnetic signal cells 311 are equally spaced along the second direction M2, and the magnetic grating bar 31a is made by recording a periodically varying signal (sine wave or rectangular wave) with equal pitch on a strip-shaped structure extending along the second direction M2 by means of magnetic recording according to the principle of magnetic tape recording. When the first detection member 31 and the second detection member 32 work, the magnetic head 32a is arranged at intervals relative to the magnetic grating bar 31a, and the magnetic signal on the magnetic grating bar 31a is read by reading the difference in the input and output induced electromotive forces of the magnetic grating bar 31a, and then the actual displacement information is converted into an electrical signal and transmitted to the controller.

[0060] In another embodiment, the first detection member 31 includes a grating bar, the length direction of the grating bar is parallel to the second direction M2, and the second detection member 32 includes a grating head.

[0061] The surface of the grating bar is coated with a plurality of equally spaced non-fully transparent patterns, and the grating head is provided with a photoelectric sensor, which can be used to detect the patterns on the grating bar and obtain the position of the grating head relative to the grating scale through the physical positioning method of grating detection, so as to obtain the real-time position information of the movable assembly 20 on the transmission assembly 10.

[0062] Therefore, there can be various specific structures for the first detection member 31 and the second detection member 32, and this embodiment does not specifically limit them.

[0063] Refer to Figure 4In this embodiment, the detection component 30 further includes a third detection member 33. The third detection member 33 is disposed on the transmission component 10 or the movable component 20. The third detection member 33 is configured to detect the distance between the third detection member 33 and the printing platform 207 in the printing area.

[0064] In this way, the third detection member 33 can be used to obtain the distance between the movable component 20 and the printing platform 207 along the first direction M1 in real time, so as to obtain the real-time height information of the print head 208 and the printing platform 207 along the Z direction at various locations in the XY plane during the printing process. When the actual height information is different from the preset height information, the printing platform 207 can be leveled by the leveling mechanism to make the actual height information the same as the preset height information, thereby improving the position height accuracy of each printing layer.

[0065] In this embodiment, there are multiple ways to level the print head 208 and the printing platform 207. For example, a leveling drive (not shown in the figure) is connected between the printing platform 207 and the base 205, and the leveling drive is connected to the printing platform 207 and is used to drive the printing platform 207 to move along the Z direction. Under the condition that the real-time height information is different from the preset height information, the leveling drive drives the printing platform 207 to move along the Z phase to achieve leveling of the printing platform 207. For another example, under the condition that the real-time height information is different from the preset height information, the Z-direction drive component drives the X-axis drive component 201 to move along the Z direction, so that the actual height of the print head 208 in the Z direction changes, and the actual height information is the same as the preset height information. Therefore, this embodiment does not specifically limit the leveling method between the printing platform 207 and the print head 208.

[0066] In this embodiment, see Figure 3 and Figure 5 , the transmission assembly 10 has a mounting surface 11 close to the printing platform 207 along the first direction M1. In this embodiment, the mounting surface 11 is the bottom surface of the transmission assembly 10. The third detection member 33 is mounted on the mounting surface 11; the third detection member 33 includes a housing 332 and a plurality of detectors 334, the plurality of detectors 334 are distributed in the housing 332 along the second direction M2, the housing 332 has a detection surface 331 on the side away from the mounting surface 11, and the plurality of detectors 334 are used to send detection signals, and the detection signals are used to pass through the detection surface 331 to reach the printing platform 207, so as to detect the distance between the printing platform 207 and the transmission assembly 10 along the first direction M1.

[0067] The possibility of dust accumulation on the mounting surface 11 is low, so that the possibility of dust or foreign matter accumulation on the surface of the first detection member 31 is low, and the amount of dust accumulated on the surface of the first detection member 31 is reduced, reducing the influence of dust on the detection coordination of the second detection member 32 and the first detection member 31, and improving the detection accuracy of the second detection member 32 and the first detection member 31.

[0068] Optionally, the number and distribution mode of the multiple detectors 334 can be adjusted according to the actual detection accuracy. For example, the multiple detectors 334 can be arranged in an array to implement the surface scanning detection mode of the third detection member 33 on the printing platform 207 in the printing area. The multiple detectors 334 can also be arranged in a row to implement the line scanning detection mode of the third detection member 33 on the printing platform 207 in the printing area. Among them, the detector 334 can be set as various different rangefinders such as an infrared ranging detector, a laser detector, or an electromagnetic detector.

[0069] In this embodiment, referring to Figure 1 , the printing platform 207 has a first side 2071 and a second side 2072 arranged opposite to each other in the X direction. With reference to Figure 3 and Figure 4 , the length direction of the third detection member 33 is parallel to the second direction M2 (i.e., the X direction), and the scanning surface or scanning line of the third detection member 33 on the printing platform 207 extends from the first side 2071 to the second side 2072.

[0070] When the third detection member 33 has a scanning line, the third detection member 33 can simultaneously detect the distances between various positions along the second direction M2 (i.e., the X direction) and the printing platform 207. During the relative movement of the printing platform 207 and the transmission assembly 10 in the Y direction, the distance detection between each position on the XY plane and the printing substrate along the first direction M1 (i.e., the Z direction) can be realized, thereby improving the detection efficiency. When the third detection member 33 has a scanning surface, the third detection member 33 can simultaneously detect the distances between each position on the XY plane and the printing platform 207 along the first direction M1 in the second direction M2 and the third direction M3.

[0071] In other embodiments, the first side 2071 and the second side 2072 are configured as two sides of the printing platform 207 in any direction within a plane perpendicular to the Z direction, such as two sides of the printing platform 207 arranged opposite to each other in the Y direction.

[0072] Optionally, the length direction of the third detection member 33 is parallel to the second direction M2 for easy installation on the transmission assembly 10.

[0073] In other embodiments, the length direction of the third detection member 33 can also be set to intersect with the second direction M2.

[0074] In this embodiment, referring to Figure 5, the transmission assembly 10 has a mounting surface 11 that approaches the printing platform 207 along the first direction M1. The third detection member 33 is mounted on the mounting surface 11. The side of the third detection member 33 facing away from the mounting surface 11 is the detection surface 331. The detection surface 331 is used to obtain the distance between the detection surface 331 and the printing platform 207 along the first direction M1. The projection of the detection surface 331 on the printing platform 207 along the first direction M1 extends from the first side 2071 to the second side 2072.

[0075] The detection surface 331 is used to emit non-visible light such as laser or infrared rays to obtain the real-time height information between the detection surface 331 and the printing platform 207 along the first direction M1 at various positions along the second direction M2.

[0076] In this embodiment, refer to Figure 5 , the third detection member 33 includes a housing 332 and an annular rib 333. The annular rib 333 protrudes from the surface of the housing 332 close to the printing platform 207. The detection surface 331 is located on the surface of the housing 332 close to the printing platform 207 and is inside the annular rib 333.

[0077] In this way, the annular rib 333 can play a further role in dust prevention, thereby reducing the possibility of dust and waste material residues accumulating on the detection surface 331, and thus improving the detection reliability of the third detection member 33.

[0078] In this embodiment, refer to Figure 5 , the mounting surface 11 is provided with a mounting groove 111. The length direction of the mounting groove 111 is parallel to the second direction M2. The third detection member 33 is mounted in the mounting groove 111, and the detection surface 331 is located inside the opening of the mounting groove 111.

[0079] The possibility of dust accumulation at the mounting surface 11 is relatively low. In this way, the possibility of dust, foreign objects or waste material residues accumulating on the surface of the third detection member 33 is relatively low, and the amount of dust accumulated on the surface of the third detection member 33 is reduced, reducing the influence of dust, foreign objects or waste material residues on the detection accuracy of the third detection member 33 and improving the detection accuracy of the third detection member 33.

[0080] At the same time, the detection surface 331 inside the mounting groove 111 can be further protected from dust, further improving the detection accuracy of the third detection member 33.

[0081] In this embodiment, refer to Figure 6, the transmission device 100 further includes a transmission belt 50, a first transmission pulley 61 and a second transmission pulley 62. The first transmission pulley 61 is rotatably connected to one end of the transmission assembly 10 in the length direction, and the second transmission pulley 62 is rotatably connected to the other end of the transmission assembly 10 in the length direction. The transmission belt 50 is wound around the first transmission pulley 61 and the second transmission pulley 62, and the movable assembly 20 is fixedly connected to the transmission belt 50. Among them, the transmission belt 50 can be set as a synchronous belt, the first transmission pulley 61 can be set as a synchronous pulley, and the second transmission pulley 62 can be set as a synchronous pulley.

[0082] Optionally, the transmission device 100 further includes a driving motor (not shown in the figure). The driving motor is fixedly connected to one of the first transmission pulley and the second transmission pulley 62. The driving motor is used to drive the first transmission pulley 61 or the second transmission pulley 62 to rotate, thereby driving the transmission belt 50 to move along the second direction M2, so as to realize the movement of the movable assembly 20 along the second direction M2. The driving motor can be set as a stepping rotary motor or a servo rotary motor.

[0083] Optionally, the transmission device 100 further includes a controller (not shown in the figure). The controller is communicatively connected to the second detection member 32, and the controller is communicatively connected to the driving motor. The controller is used to receive the real-time position information detected by the second detection member 32, and the controller is used to receive the predetermined position information of the movable assembly 20 during the printing process. The controller is further used to compare the real-time position information and the predetermined position information. When the real-time position information and the predetermined position information are different, the controller calculates the compensation displacement information based on the real-time position information and the predetermined position information, and outputs a control signal to the driving motor to control the driving motor to drive the transmission belt 50 to move according to the compensation displacement information, thereby correcting the position of the movable assembly 20 in real time so that the real-time position information of the movable assembly 20 is the same as the predetermined position information.

[0084] In this embodiment, refer to Figure 6 , the transmission belt 50 includes a first straight section 51 and a second straight section 52. The first straight section 51 is located on one side of the transmission assembly 10 along the third direction M3, and the second straight section 52 is located on the other side of the transmission assembly 10 along the third direction M3. The movable assembly 20 is fixedly connected to the first straight section 51 or the second straight section 52. The transmission device 100 further includes a guide pulley 63. The guide pulley 63 is rotatably connected to the movable assembly 20. The guide pulley 63 is located on one side of the transmission assembly 10 along the first direction M1 and abuts against the transmission assembly 10.

[0085] In this way, when the first straight section 51 or the second straight section 52 is driven to move, the movable assembly 20 moves together with the belt section connected thereto, and the guide pulley 63 synchronously moves along the other side of the transmission assembly 10, avoiding interference in the movement between the first straight section 51, the second straight section 52 and the guide pulley 63, and improving the movement reliability of the movable assembly 20.

[0086] Refer to in conjunction withFigure 6 , the drive belt 50 further includes a first arc segment 53 and a second arc segment 54. The first arc segment 53 is engaged with the first drive wheel 61. One end of the first arc segment 53 is connected to one end of the first straight segment 51 in the length direction, and the other end of the first arc segment 53 is connected to one end of the second straight segment 52 in the length direction. One end of the second arc segment 54 is connected to the other end of the first straight segment 51 in the length direction, and the other end of the second arc segment 54 is connected to the other end of the second straight segment 52 in the length direction.

[0087] In this embodiment, referring to Figure 7 , a concave guide groove 12 is formed on one surface of the transmission assembly 10 along the first direction M1 (which can also be seen in Figure 3 ). The guide wheel 63 is engaged in the guide groove 12. Through the cooperation of the guide wheel 63 and the guide groove 12, the guiding effect of the guide wheel 63 on the movable assembly 20 can be further realized, and the moving accuracy of the movable assembly 20 can be improved.

[0088] Optionally, referring to Figure 8 , the transmission device 100 includes a first guide wheel 63a and a second guide wheel 63b. The first guide wheel 63a is rotatably connected to the mounting member, and the second guide wheel 63b is rotatably connected to the mounting member. The first guide wheel 63a is located on one side of the transmission assembly 10 along the first direction M1, and the second guide wheel 63b is located on the other side of the transmission assembly 10 along the first direction M1. An inner concave first guide groove 12 is formed on one side of the transmission assembly 10 along the first direction M1, and the first guide groove 12 extends along the second direction M2. An inner concave second guide groove 12 is formed on one side of the transmission assembly 10 along the second direction M2, and the second guide groove 12 extends along the second direction M2. The first guide wheel 63a is engaged in the first guide groove 12, and the second guide wheel 63b is engaged in the second guide groove 12.

[0089] Through the cooperation of the first guide wheel 63a and the second guide wheel 63b, the moving reliability of the movable assembly 20 along the second direction M2 of the transmission assembly 10 can be further improved.

[0090] Optionally, referring to Figure 8 , there are two first guide wheels 63a, and the two first guide wheels 63a are arranged at intervals along the second direction M2. There is one second guide wheel 63b, and the projection of the second guide wheel 63b on the transmission assembly 10 is located between the projections of the two first guide wheels 63a on the transmission assembly 10.

[0091] In this embodiment, referring to Figure 7, the transmission assembly 10 includes a transfer frame 13, a first mounting frame 14, a second mounting frame 15, and an adjusting member 16. The first transmission wheel 61 is rotatably connected to the first mounting frame 14, and the second transmission wheel 62 is rotatably connected to the second mounting frame 15. The first mounting frame 14 is fixed to one end of the transfer frame 13 along the second direction M2, and the second mounting frame 15 is slidably connected to the other end of the transfer frame 13 along the second direction M2. The adjusting member 16 is used to fix the second mounting frame 15 at different positions of the transfer frame 13 along the second direction M2. Thus, by adjusting the distance between the second mounting frame 15 and the first mounting member along the second direction M2 by the adjusting member 16, the tension of the transmission belt 50 between the first transmission wheel 61 and the second transmission wheel 62 can be adjusted.

[0092] Optionally, referring to Figure 9 , the transmission assembly 10 further includes a fixing plate 17 and a connecting plate 18. The fixing plate 17 is located at one end of the transfer frame 13 facing away from the first mounting frame 14. The fixing plate 17 is spaced from the transfer frame 13 along the second direction M2. The fixing plate 17 is connected to the transfer frame 13 through the connecting plate 18. The second mounting frame 15 is disposed between the fixing plate 17 and the transfer frame 13. The second mounting frame 15 is slidably fitted on the connecting plate 18 along the second direction M2. The adjusting member 16 passes through the fixing plate 17 from the side of the fixing plate 17 facing away from the transfer frame 13 and is connected to the second mounting frame 15. By adjusting the distance between the second mounting frame 15 and the transfer frame 13 by the adjusting member 16, the position adjustment of the second mounting frame 15 and the first mounting frame 14 is realized, and the tension adjustment of the transmission belt 50 is completed. Thus, the adjusting member 16 of this embodiment has the effect of conveniently adjusting the tension of the transmission belt 50, which is beneficial to reducing the error between the actual position information and the predetermined position information of the moving assembly 20 and improving the printing accuracy.

[0093] Optionally, referring to Figure 9 , the connecting plate 18 is provided with a guiding hole, and the length direction of the guiding hole is parallel to the second direction M2. The second mounting frame 15 is provided with a guiding protrusion 192, and the guiding protrusion 192 passes through the guiding hole. When the second mounting frame 15 moves along the second direction M2 under the action of the adjusting member 16, the guiding hole can guide the guiding protrusion 192, thereby improving the moving accuracy of the second mounting frame 15 during the tension adjustment process.

[0094] In another embodiment of the present application, the transmission assembly 10 can also be formed into another structural form. The transmission assembly 10 includes an optical axis and a mounting bracket. The length direction of the optical axis is parallel to the second direction M2, and the movable assembly 20 is movably arranged on the optical axis along the second direction M2. The mounting bracket is arranged at an interval from the optical axis along the first direction M1 or the third direction M3, the length direction of the mounting bracket is parallel to the second direction M2, and the mounting bracket is parallel and spaced from the optical axis. Both ends of the length direction of the mounting bracket are respectively connected to the base 205 or two columns, and the first detection member 31 is fixedly arranged on the mounting bracket. Therefore, in this embodiment, there are various structural ways of the transmission assembly 10 and the first detection member 31, which are not limited herein.

[0095] In this embodiment, referring to Figure 10 , the movable assembly 20 includes a first side plate 21, a second side plate 22, a top plate 23 and a bottom plate 24. The first side plate 21, the top plate 23, the second side plate 22 and the bottom plate 24 are sequentially connected to enclose an avoidance hole 26, and the transmission assembly 10 is disposed through the avoidance hole 26. The first guide wheel 63a is rotatably connected between the first side plate 21 and the second side plate 22, and the first guide wheel 63a is located between the top plate 23 and the transmission assembly 10. The second guide wheel 63b is rotatably connected between the first side plate 21 and the second side plate 22, and the second guide wheel 63b is located between the bottom plate 24 and the transmission assembly 10.

[0096] In other embodiments, the movable assembly 20 can also be provided with only the first side plate 21 or the second side plate 22, and the stable movement of the movable assembly 20 along the transmission assembly 10 can also be realized. The specific structure of the movable assembly 20 can be adjusted according to actual needs, and this embodiment does not specifically limit it.

[0097] In this embodiment, referring to Figure 10 , a mounting protrusion 25 is provided on one side of the first side plate 21 along the second direction M2, and the second detection member 32 is fixedly arranged on the mounting protrusion 25 and extends into one side of the first detection member 31 along the third direction M3, so as to realize the relative position detection of the first detection member 31 and the second detection member 32. The specific mounting position of the second detection member 32 on the mounting protrusion 25 can be adjusted according to actual needs. And, in other embodiments, the second detection member 32 can also be fixedly arranged at the top plate 23 or the bottom plate 24, and the second detection member 32 can also be arranged on the plate surface of the first side plate 21 or the second side plate 22. The specific mounting position of the second detection member 32 can be adjusted according to actual needs.

[0098] Embodiment Two

[0099] Next, in combination with Figure 10Describe the transmission device 100a according to another embodiment of the present application. The structure of the transmission device 100a in this embodiment is substantially the same as that of the transmission device 100 in the first embodiment. The difference is that the third detection member 33 in this embodiment is disposed on the movable assembly 20.

[0100] Refer to Figure 10 , in this embodiment, the third detection member 33 can move with the print head 208. Thus, during the movement of the print head 208 relative to the print substrate in the XY plane, the third detection member 33 can detect the real-time height information of the print head 208 at various positions in the XY plane along the first direction M1 with respect to the print substrate, and transmit it to the controller. The controller compares the real-time height information with the preset height information to control the leveling action between the print head 208 and the print substrate.

[0101] Fixing the third detection member 33 to the movable assembly 20, with the leveling reference of the third detection member 33 being the print head 208, can further improve the leveling accuracy of the print substrate compared to using the transmission assembly 10 as the leveling reference, thereby improving the printing quality of the printed parts.

[0102] In this embodiment, the third detection member 33 is fixedly disposed at the first side plate 21, the second side plate 22, the top plate 23 or the bottom plate 24 of the movable assembly 20.

[0103] In this embodiment, the third detection member 33 can be set as a laser ranging head 33a. The laser ranging head 33a is used to emit a point laser to the print substrate or to send a plane laser to the print substrate, and the projection of the plane laser on the print substrate is less than or equal to one square millimeter. In this way, the volume of the laser ranging head 33a can be reduced, and the detection accuracy of the third detection member 33 can be improved, thereby playing a role in improving the detection accuracy of the third detection member 33.

[0104] Embodiment Three

[0105] Next, in combination with Figure 11 Describe the 3D printer 200a according to another embodiment of the present application. The structure of the 3D printer 200a in this embodiment is substantially the same as that of the 3D printer 200 in the first embodiment. The difference is that the first Y-axis drive assembly 202 in this embodiment adopts the structure of the transmission device 100 in the first embodiment, and the movable assembly 20 of the transmission device 100 in this embodiment is fixedly connected to the printing platform 207. Moreover, in this embodiment, the first direction M1 is parallel to the Y direction. The Y direction in this embodiment can be perpendicular or oblique to the X direction. The positional relationship between the Y direction and the X direction can be determined according to the specific type of the 3D printer 200a, which will not be elaborated here.

[0106] The 3D printer 200b in this embodiment can be an integral 3D printer, a single cantilever 3D printer, an infinite Z-axis 3D printer, etc.

[0107] In this embodiment, the mounting surface 11 of the transmission assembly 10 is the top surface of the transmission assembly 10 along the Z direction, so as to facilitate the third detecting member 33 to detect the real-time height information between the transmission assembly 10 and the printing platform 207, thereby determining whether the printing platform 207 is horizontal. Moreover, through the detecting assembly 30, the displacement accuracy of the printing platform 207 along the Y direction can be detected.

[0108] Thus, the first Y-axis driving assembly 202 in this embodiment adopts the aforementioned transmission device 100, which can improve the relative displacement accuracy between the printing platform 207 and the print head 208, and further improve the printing quality of the printed matter.

[0109] In addition, when the first Y-axis driving assembly 202 adopts the aforementioned transmission device 100, the transmission device 100 may further include an X-axis displacement member, and the X-axis displacement member is connected between the third detecting member 33 and the movable assembly 20 or the transmission assembly 10, so that the third detecting member 33 can detect the levelness of the printing platform 207 at each point in the XY plane, thereby facilitating the calibration of the levelness of the printing platform 207.

[0110] Embodiment Four

[0111] Next, in combination with Figure 12 Describe a 3D printer 200b according to another embodiment of the present application. The structure of the 3D printer 200b in this embodiment is substantially the same as the structure of the 3D printer 200 in Embodiment One. The difference is that the printing platform 207 of the 3D printer 200b in this embodiment is fixedly arranged on the base 205. The 3D printer 200 in this embodiment further includes a second Y-axis driving assembly 203. The second Y-axis driving assembly 203 is connected to the Z-axis driving assembly 204 and can move along the Z direction under the drive of the Z-axis driving assembly 204. The X-axis driving assembly 201 is connected to the second Y-axis driving assembly 203 and can move along the Y axis under the drive of the second Y-axis driving assembly 203. Moreover, in this embodiment, the first direction M1 is parallel to the Y direction. The Y direction in this embodiment may be perpendicular or oblique to the X direction, and the positional relationship between the Y direction and the X direction can be determined according to the specific type of the 3D printer 200b, which will not be elaborated here.

[0112] The 3D printer 200b in this embodiment may be an integral 3D printer, a single cantilever 3D printer, an infinite Z-axis 3D printer, a delta 3D printer, or the like.

[0113] Thus, the second Y-axis driving assembly 203 in this embodiment adopts the aforementioned transmission device 100, which can improve the relative displacement accuracy between the printing platform 207 and the print head 208, and further improve the printing quality of the printed matter.

[0114] Embodiment Five

[0115] The following will combine with Figure 13 to describe the 3D printer 200c according to another embodiment of the present application. The structure of the 3D printer 200c in this embodiment is substantially the same as that of the 3D printer 200 in the first embodiment, except that the Z-axis drive assembly 204 in this embodiment adopts the transmission device 100 of the first embodiment. Moreover, in this embodiment, the first direction M1 is parallel to the Z direction. The Z direction in this embodiment can be perpendicular or oblique to the X direction, and the positional relationship between the Z direction and the X direction can be determined according to the specific type of the 3D printer 200c, which will not be elaborated here.

[0116] The 3D printer 200c in this embodiment can be an integral 3D printer, a single cantilever 3D printer, an infinite Z-axis 3D printer, a delta 3D printer, or the like.

[0117] Therefore, by adopting the aforementioned transmission device 100 for the Z-axis drive assembly 204 in this embodiment, the relative displacement accuracy between the printing platform 207 and the print head 208 can be improved, thereby improving the printing quality of the printed part.

[0118] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A transmission device for a 3D printer, wherein the 3D printer has a printing area defined by a printing platform and a print head, characterized in that: The transmission device comprises: A transmission assembly, wherein the transmission assembly is extended along a first direction; A movable component, wherein the movable component is movably disposed on the transmission component; A detection component, the detection component comprising a first detection member and a second detection member, the first detection member is arranged on the transmission component along the first direction, and the second detection member is arranged on the movable component; Wherein, the detection component is configured to detect its position information relative to the first detection component through the second detection component to obtain the displacement information of the movable component in the first direction.

2. The transmission device according to claim 1, characterized in that: The transmission assembly has a mounting surface extending along the first direction, the first detection member is arranged on the mounting surface, and the second detection member is arranged toward the first detection member.

3. The transmission device according to claim 2, characterized in that: The first detection member includes a magnetic grating bar disposed on the transmission component, and the second detection member includes a magnetic head disposed on the movable component, wherein the magnetic head is configured to convert a magnetization signal of the magnetic grating bar into an electrical signal.

4. The transmission device according to claim 1, characterized in that: The detection component further includes a third detection member, which is disposed on the transmission component or the movable component, and is configured to detect the distance between the third detection member and the printing platform in the printing area.

5. The transmission device according to claim 4, characterized in that: The printing area has a first side and a second side disposed opposite to each other; The third detecting member is disposed on the transmission assembly, and a scanning surface or a scanning line projection of the third detecting member on the printing platform extends from the first side to the second side.

6. The transmission device according to claim 4, characterized in that: The transmission assembly has a mounting surface facing the printing platform, and the third detection member is mounted on the mounting surface; the third detection member includes a shell and a plurality of detectors, and the plurality of detectors are distributed in the shell in the length direction of the shell, and the shell has a detection surface facing away from the mounting surface. The plurality of detectors are used to emit detection signals, and the detection signals are configured to pass through the detection surface and reach the printing platform, so as to detect the distance between the detector and the printing platform in the printing area.

7. The transmission device according to claim 6, characterized in that: The third detection member further includes an annular baffle, which is protruding from a surface of the shell close to the printing platform, and the detection surface is located on an inner side of the annular baffle.

8. The transmission device according to claim 4, characterized in that: The transmission assembly has a mounting surface facing the printing platform, the mounting surface is provided with a mounting groove, the length direction of the mounting groove is parallel to the first direction, and the third detection member is installed in the mounting groove.

9. The transmission device according to claim 1, characterized in that: The transmission device also includes a transmission belt, a first transmission wheel and a second transmission wheel. The first transmission wheel is rotatably connected to one end of the transmission component in the length direction, and the second transmission wheel is rotatably connected to the other end of the transmission component in the length direction. The transmission belt is wound around the first transmission wheel and the second transmission wheel, and the movable component is fixedly connected to the transmission belt.

10. A 3D printer, characterized in that: include: The transmission device according to any one of claims 1 to 9; A printing platform is disposed on one side of the transmission device along a first direction, and the printing platform can move relative to the transmission device along the first direction.

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