Printing head and 3D printer
By designing a laser module, a powder ejection module, and a protective gas ejection module in the 3D printing head, the problems of high cost and poor printing quality in existing technologies have been solved, achieving low-cost and high-precision printing results.
Patent Information
- Application Number
- CN202423149889.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-19
AI Technical Summary
Existing 3D printing heads have shortcomings in balancing low cost and high printing quality. They are complex in structure and expensive, and the improvement in printing accuracy is not significant.
Design a printhead comprising a laser module, a powder ejection module, and a protective gas ejection module. The laser module, powder ejection module, and protective gas ejection module are respectively disposed on different sides. The laser module ejects laser to melt powder, and the protective gas ejection module provides a protective gas atmosphere. The cross-sectional area of the powder and protective gas delivery chambers gradually decreases to improve accuracy and speed.
It achieves low cost and high printing quality by reducing internal stress in the metal through a protective atmosphere, thereby improving printing accuracy and quality. The structure is simple and easy to assemble.
Smart Images
Figure CN223849989U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of 3D printing, in particular, relates to a printing head and a 3D printer. BACKGROUND
[0002] The printing head of some known 3D printers needs to simultaneously transport printing powder and protective atmosphere, and has a complex structure and high cost, and the printing precision is not obviously improved, so that low cost and high printing quality cannot be considered. CONTENT OF THE UTILITY MODEL
[0003] The present application provides a printing head and a 3D printer to solve the technical problem that some known printing heads cannot consider low cost and high printing quality.
[0004] The present application provides a printing head, comprising a laser module, a powder ejection module and a protective gas ejection module; the laser module has a first side surface and a second side surface arranged opposite to each other along a first direction, the powder ejection module is connected to the first side surface, and the protective gas ejection module is connected to the second side surface; the laser module is provided with a laser exit surface on one side along a second direction, the laser exit surface is configured to emit laser, and the second direction intersects the first direction; the powder ejection module defines a powder transport cavity, the powder transport cavity is used for ejecting printing powder to a preset area along a third direction, the third direction intersects the first direction, and the cross-sectional area of the powder transport cavity gradually decreases in the direction close to the laser exit surface; the protective gas ejection module defines a protective gas transport cavity, the protective gas transport cavity is used for ejecting protective gas to the preset area along a fourth direction, the fourth direction intersects the first direction, and the cross-sectional area of the protective gas transport cavity gradually decreases in the direction close to the laser exit surface.
[0005] According to the printing head of the present application, in the printing process, the powder ejection module ejects printing powder to the preset area, the laser emitted by the laser exit surface melts and shapes the printing powder, at the same time, the protective gas transport cavity transports protective gas to the preset area, so that the melting of the printing powder can be carried out in the environment of the protective gas, and the protective gas can ensure the melting environment temperature of the printing powder, delay the cooling process after the printing powder is shaped, reduce the internal stress of the printing layer when the printing powder is metal powder, and improve the printing quality.
[0006] Meanwhile, when the flow of the printing powder and the flow of the protective gas are fixed, the width of the protective gas delivery cavity in the first direction gradually decreases in the direction close to the laser exit surface, which can improve the delivery speed of the protective gas and improve the hitting accuracy of the protective gas, so that a high-density protective gas atmosphere can be formed in a narrower range to further improve the printing quality; the width of the powder delivery cavity in the first direction gradually decreases in the direction close to the laser exit surface, which can improve the delivery speed of the printing powder and facilitate the formation of a printing layer in a narrower range to improve the formation precision of the printing layer.
[0007] In addition, the powder ejection module and the protective gas ejection module are arranged on the first side and the second side respectively, so that the structure of the print head is simple, easy to assemble and process, and the cost is low. Therefore, the print head of the present application can balance the lower processing cost and the higher printing quality.
[0008] In a possible implementation manner:
[0009] The interval of the powder ejection module and the protective gas ejection module in the first direction gradually decreases in the direction close to the laser exit surface, so that the second direction, the third direction and the fourth direction intersect at a intersection point, and the intersection point is located in the preset area.
[0010] In a possible implementation manner:
[0011] The powder ejection module comprises a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are spaced apart in the first direction, the third side wall and the fourth side wall are spaced apart in a fifth direction, the first side wall, the second side wall, the third side wall and the fourth side wall are sequentially connected and surround the powder delivery cavity, the fifth direction intersects the first direction, the first side wall is connected to the first side, and the interval between the first side wall and the second side wall gradually decreases in the direction close to the laser exit surface.
[0012] In a possible implementation manner:
[0013] The protective gas ejection module comprises a fifth side wall, a sixth side wall, a seventh side wall and an eighth side wall, the fifth side wall and the sixth side wall are spaced apart in the first direction, the seventh side wall and the eighth side wall are spaced apart in a fifth direction, the fifth side wall, the sixth side wall, the seventh side wall and the eighth side wall are sequentially connected and surround the powder delivery cavity, the fifth direction intersects the first direction, the fifth side wall is connected to the second side, and the interval between the fifth side wall and the sixth side wall gradually decreases in the direction close to the laser exit surface.
[0014] The application also provides a 3D printer comprising the printing head and the platform assembly.
[0015] In a possible implementation,
[0016] The 3D printer further comprises a first displacement device and a first connecting member. The first connecting member is in transmission connection with the first displacement device, one end of the first connecting member extends out of the first displacement device along a fifth direction, and the printing head is connected to the end of the first connecting member extending out of the first displacement device.
[0017] In a possible implementation,
[0018] The platform assembly comprises a bearing member, a heating member and a platform member. The heating member is arranged on a side of the bearing member close to the printing head. The platform member is arranged on a side of the heating member close to the printing head, and a surface of the platform member close to the printing head is provided with the preset region.
[0019] In a possible implementation,
[0020] The side of the bearing member close to the printing head is provided with a mounting groove, the heating member is mounted in the mounting groove, and the platform member covers a groove opening of the mounting groove.
[0021] In a possible implementation,
[0022] The bearing member comprises a bearing plate and a connecting part, the mounting groove is arranged in the bearing plate, the connecting part is protrudingly arranged on a groove bottom surface of the mounting groove, the heating member is provided with an avoiding hole, and the connecting part is accommodated in the avoiding hole.
[0023] In a possible implementation,
[0024] The 3D printer further comprises a second displacement device; the connecting part is provided with a fastening hole penetrating in a second direction, the fastening hole penetrates through the connecting part and the bearing plate, the fastening hole is configured to be connected with the second displacement device through a fastening structure, and the second displacement device is used to drive the platform assembly to move relative to the printing head. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0026] Figure 1 Front view of a print head according to an embodiment of the application.
[0027] Figure 2 Perspective view of a print head according to an embodiment of the application.
[0028] Figure 3 Sectional view of a print head according to an embodiment of the application.
[0029] Figure 4 Bottom view of a print head according to an embodiment of the application.
[0030] Figure 5 Schematic view of a 3D printer according to an embodiment of the application, with a first workpiece and a second workpiece on the platform assembly.
[0031] Figure 6 Schematic view of a second displacement device and a platform assembly according to an embodiment of the application.
[0032] Figure 7 Schematic view of a first displacement device, a first connecting member and a print head according to an embodiment of the application.
[0033] Figure 8 Schematic view of Figure 5 Enlarged view of II in Fig. 1.
[0034] Figure 9 Exploded view of a second displacement device and a platform assembly according to an embodiment of the application.
[0035] Figure 10 Exploded view of a carrier member, a heating member and a second displacement device according to an embodiment of the application.
[0036] Explanation of main element symbols:
[0037] 3D printer 100
[0038] Print head 10
[0039] Laser module 11
[0040] Mounting portion 111
[0041] Laser exit portion 112
[0042] Powder ejection module 12
[0043] First side wall 121
[0044] Second side wall 122
[0045] Third side wall 123
[0046] Fourth edge wall 124
[0047] Protective gas ejection module 13
[0048] Fifth edge wall 131
[0049] Sixth edge wall 132
[0050] Seventh edge wall 133
[0051] Eighth edge wall 134
[0052] First side P1
[0053] Second side P2
[0054] Laser exit surface P3
[0055] Intersection P4
[0056] Powder delivery cavity Q1
[0057] Protective gas delivery cavity Q2
[0058] Predefined area A
[0059] First direction X1
[0060] Second direction X2
[0061] Third direction X3
[0062] Fourth direction X4
[0063] Fifth direction X5
[0064] Mounting slot C
[0065] Avoidance hole K1
[0066] Fastening hole K2
[0067] First displacement device 21
[0068] Second displacement device 22
[0069] Third displacement device 23
[0070] Platform assembly 30
[0071] Carrier 31
[0072] Carrier plate 311
[0073] Connection portion 312
[0074] Heating element 32
[0075] Platform element 33
[0076] Rack 40
[0077] Column 41
[0078] Crossbeam 42
[0079] Bottom plate 43
[0080] First connecting piece 51
[0081] Second connecting piece 52
[0082] Third connecting piece 53
[0083] First connecting portion 531
[0084] Second connecting portion 532
[0085] Driving piece 61
[0086] Guide piece 62
[0087] Lead screw 63
[0088] Mounting seat 64
[0089] First workpiece 200
[0090] Second workpiece 300
[0091] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0092] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments.
[0093] 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 can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.
[0094] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
[0095] Some embodiments of the present application are described in detail. The following embodiments and features of the embodiments can be combined with each other in the case of no conflict.
[0096] Referring to Figure 1 and Figure 2 , the embodiment provides a print head 10, comprising a laser module 11, a powder ejection module 12 and a protective gas ejection module 13. The laser module 11 has a first side P1 and a second side P2 arranged opposite to each other along a first direction X1, the powder ejection module 12 is connected to the first side P1, the protective gas ejection module 13 is connected to the second side P2, and the laser module 11 is provided with a laser exit surface P3 on one side along a second direction X2, the laser exit surface P3 is configured to emit laser, and the second direction X2 intersects the first direction X1. The powder ejection module 12 defines a powder delivery cavity Q1 for ejecting printing powder towards a predetermined area A along a third direction X3, the third direction X3 intersects the first direction X1, and the cross-sectional area of the powder delivery cavity Q1 gradually decreases in the direction close to the laser exit surface P3. The protective gas ejection module 13 defines a protective gas delivery cavity Q2 for ejecting protective gas towards the predetermined area A along a fourth direction X4, the fourth direction X4 intersects the first direction X1, and the cross-sectional area of the protective gas delivery cavity Q2 gradually decreases in the direction close to the laser exit surface P3.
[0097] According to the print head 10 of the embodiment, in the printing process, the powder ejection module 12 ejects printing powder to the predetermined area A, the laser emitted by the laser exit surface P3 melts and shapes the printing powder, and at the same time, the protective gas delivery cavity Q2 delivers protective gas to the predetermined area A, so that the melting of the printing powder can be carried out in the environment of the protective gas, which can ensure the melting environment temperature of the printing powder, delay the cooling process after the printing powder is shaped, reduce the internal stress of the printing layer when the printing powder is metal powder, and improve the printing quality. The protective gas can be configured as high-temperature inert gas, such as helium, argon, etc.
[0098] At the same time, in the case that the flow rate of the printing powder and the flow rate of the protective gas are fixed, the width of the protective gas delivery cavity Q2 along the first direction X1 gradually decreases in the direction close to the laser exit surface P3, which can improve the delivery speed of the protective gas and improve the hitting accuracy of the protective gas, so as to form a protective gas atmosphere with higher density in a narrower range, thereby further improving the printing quality; the width of the powder delivery cavity Q1 along the first direction X1 gradually decreases in the direction close to the laser exit surface P3, which can improve the delivery speed of the printing powder, facilitate the shaping of the printing layer in a narrower range, and improve the shaping precision of the printing layer.
[0099] In addition, the powder ejection module 12 and the protective gas ejection module 13 are arranged on the first side P1 and the second side P2 respectively, so that the structure of the print head 10 is simple, easy to assemble and process, and the cost is low. Therefore, the print head 10 of the present application can balance the lower processing cost and the higher printing quality.
[0100] The powder delivery cavity Q1 of the powder ejection module 12 can be connected with the powder feeding device. The protective gas ejection module 13 can be connected with the protective gas delivery device. Alternatively, the powder ejection module 12 can also integrate the powder storage and powder delivery functions, and the protective gas ejection module 13 can also integrate the protective gas storage and protective gas delivery functions.
[0101] In some embodiments, referring to Figure 1 and Figure 2 , the interval of the powder ejection module 12 and the protective gas ejection module 13 along the first direction X1 gradually decreases in the direction close to the laser exit surface P3, so that the second direction X2, the third direction X3 and the fourth direction X4 intersect at a intersection point P4, and the intersection point P4 is located in the preset area A. In this way, the printing powder, the protective gas and the laser can be ensured to be at the same position in the preset area A, i.e. the intersection point P4, so as to improve the printing precision.
[0102] In some embodiments, referring to Figure 2 and Figure 3 , the powder ejection module 12 includes a first side wall 121, a second side wall 122, a third side wall 123 and a fourth side wall 124. The first side wall 121 and the second side wall 122 are spaced apart along the first direction X1, the third side wall 123 and the fourth side wall 124 are spaced apart along a fifth direction X5, and the first side wall 121, the second side wall 122, the third side wall 123 and the fourth side wall 124 are sequentially connected and surrounded to form the powder delivery cavity Q1, and the fifth direction X5 intersects the first direction X1. In the direction close to the laser exit surface P3 along the first direction X1, the interval of the first side wall 121 and the second side wall 122 gradually decreases in the direction close to the laser exit surface P3, and the interval between the third side wall 123 and the fourth side wall 124 is equal. In this way, the cross-sectional area of the powder delivery cavity Q1 can gradually decrease in the direction close to the laser exit surface P3.
[0103] In some embodiments, referring to Figure 2 and Figure 3The protective gas ejection module 13 comprises a fifth side wall 131, a sixth side wall 132, a seventh side wall 133 and an eighth side wall 134. The fifth side wall 131 and the sixth side wall 132 are spaced apart along the first direction X1, and the seventh side wall 133 and the eighth side wall 134 are spaced apart along the fifth direction X5. The fifth side wall 131, the sixth side wall 132, the seventh side wall 133 and the eighth side wall 134 are sequentially connected and form the powder conveying cavity Q1. The fifth direction X5 intersects the first direction X1. The distance between the fifth side wall 131 and the sixth side wall 132 gradually decreases in the direction close to the laser emission surface P3. In this way, the cross-sectional area of the protective gas conveying cavity Q2 gradually decreases in the direction close to the laser emission surface P3.
[0104] In some embodiments, referring to Figure 4 The laser module 11 comprises a mounting portion 111 and a laser emission portion 112. The mounting portion has a first side P1 and a second side P2. The laser emission portion 112 is arranged on one side of the mounting portion 111 along the second direction X2, and the surface of the laser emission portion 112 away from the mounting portion 111 is the laser emission surface P3. In other embodiments, the laser module 11 can be configured as an integrally formed structure.
[0105] In some embodiments, referring to Figure 4 The projection of the laser emission surface P3 along the first direction X1 is located inside the powder conveying cavity Q1, and the projection of the laser emission surface P3 along the first direction X1 is located inside the protective gas conveying cavity Q2.
[0106] In this way, the size of the powder range sprayed by the powder conveying cavity Q1 in the first direction X1 is greater than the laser emission surface P3, so that the powder conveying cavity Q1 can spray a larger range of powder in the preset area A to ensure the stability of the laser melting printing powder. At the same time, the protective gas conveying cavity Q2 can spray a larger range of protective gas to ensure that the laser emitted by the laser module 11 is located inside the protective gas, thereby improving the protection effect during the melting printing process.
[0107] Referring to Figure 5 The present embodiment provides a 3D printer 100 comprising a printing head 10 and a platform assembly 30. The platform assembly 30 is movably arranged on one side of the printing head 10, and the platform assembly 30 is provided with a preset area A. The printing head 10 is used to extrude printing consumables to the platform assembly 30. The printing consumables can be metal powder or plastic.
[0108] The 3D printer 100 further comprises a rack 40, a first displacement device 21, a second displacement device 22 and two third displacement devices 23.
[0109] The rack 40 comprises a base plate 43, a cross beam 42 and two upright columns 41. The two upright columns 41 are arranged at the base plate 43 and spaced apart along a first direction X1. The two upright columns 41 extend along a second direction X2. The second direction X2 is perpendicular to or obliquely intersects the first direction X1. The cross beam 42 extends along the first direction X1 and is connected to the two upright columns 41 at two ends thereof.
[0110] The two third displacement devices 23 are arranged at the two upright columns 41 respectively and extend along the second direction X2.
[0111] The first displacement device 21 is drivingly connected to the two third displacement devices 23 and can move along the second direction X2 under the driving of the two third displacement devices 23. The first displacement device 21 is drivingly connected to the print head 10.
[0112] The second displacement device 22 extends along a fifth direction X5 and is arranged at the base plate 43. The second displacement device 22 is drivingly connected to the platform assembly 30.
[0113] In this way, the relative movement of the print head 10 and the platform assembly 30 along the first direction X1, the second direction X2 and the fifth direction X5 can be realized through the first displacement device 21, the second displacement device 22 and the third displacement device 23, so that the print head 10 can complete 3D printing on the platform assembly 30.
[0114] Specifically, referring to Figure 5 and Figure 6 , a first workpiece 200 can be prearranged on the platform assembly 30. The first workpiece 200 can be configured as a plate-shaped structure. By controlling the relative movement of the print head 10 along the edge of the first workpiece 200 relative to the platform assembly 30, and sequentially processing and forming at the edge of the first workpiece 200, a second workpiece 300 in the form of a surrounding wall is finally formed, thereby constructing a product with a base plate and a surrounding wall. In this printing mode, since the second workpiece 200 in the form of a surrounding wall is formed by laser printing, the welding of the first workpiece 100 and the second workpiece 200 can be realized synchronously, which can ensure the connection reliability between the second workpiece 200 and the first workpiece 100 of the metal structure; and since the first workpiece 100 can be directly selected from metal plates, the overall printing time of the product is reduced, thereby balancing the processing efficiency and processing quality of the product, which can meet the mass production demand of high quality.
[0115] In other embodiments, the workpiece of the required structure can also be directly constructed by 3D printing.
[0116] In some embodiments, referring to Figure 7The 3D printer 100 further comprises a first connecting member 51, the first connecting member 51 is drivingly connected to the first displacement device 21, one end of the first connecting member 51 extends out of the first displacement device 21 along the fifth direction X5, and the print head 10 is connected to the one end of the first connecting member 51 extending out of the first displacement device 21.
[0117] In this way, the movement of the print head 10 will not collide with the first connecting member 51 or the column 41, the third displacement device 23, etc., thereby ensuring the working reliability of the print head 10.
[0118] Optionally, the first connecting member 51 is connected to the mounting portion 111.
[0119] In some embodiments, in the second direction X2, the laser exit surface P3 is located between the first connecting member 51 and the platform assembly 30, thereby further reducing the interference problem that may occur during the movement of the print head 10.
[0120] In the present embodiment, the first displacement device 21, the second displacement device 22 and the third displacement device 23 have substantially the same structure, and the first displacement device 21 will be described as an example.
[0121] Referring to Figure 7 The first displacement device 21 comprises a driving member 61, a guide member 62, a lead screw 63 and two mounting seats 64. The two mounting seats 64 are spaced apart. The two ends of the lead screw 63 are rotatably arranged in the two mounting seats 64. The guide member 62 is connected between the two mounting seats 64 and extends along the spacing direction of the two mounting seats 64. The connecting member (the first connecting member 51, the second connecting member 52 or the third connecting member 53) is drivingly connected to the lead screw 63. The guide member 62 is in guiding cooperation with the connecting member to guide the movement direction of the connecting member. The driving member 61 is arranged on the side of one mounting seat 64 away from the other mounting seat 64. The driving member 61 is drivingly connected to the lead screw 63 to drive the rotation of the lead screw 63, thereby driving the movement of the connecting member along the length direction of the lead screw 63. The driving member 61 can be configured as an electric motor.
[0122] In other embodiments, the first displacement device 21, the second displacement device 22 and the third displacement device 23 can also be configured as a transmission belt type displacement structure.
[0123] In the present embodiment, the guide member 62 is configured as an optical axis structure, and in other embodiments, the guide member 62 can be configured as a slide rail structure.
[0124] In some embodiments, referring to Figure 8The 3D printer 100 further comprises a third connecting member 53. The third connecting member 53 connects the first displacement device 21 and the second displacement device 22. The third connecting member 53 comprises a first connecting portion 531 and two second connecting portions 532. The two second connecting portions 532 are respectively drivingly connected to the two third displacement devices 23. The first connecting portion 531 extends along the first direction X1 and is connected between the two second connecting portions 532. The first displacement device 21 is arranged on the first connecting portion 531.
[0125] In some embodiments, referring to Figure 9 and Figure 10 , the platform assembly 30 comprises a bearing member 31, a heating member 32 and a platform member 33. The heating member 32 is arranged on the bearing member 31 close to the print head 10. The platform member 33 is arranged on the heating member 32 close to the print head 10, and a surface of the platform member 33 close to the print head 10 is provided with a preset area A. In this way, the heating member 32 can heat the platform member 33, so that the temperature of the parts on the preset area A rises, and the heating member 32 can heat the printed layers, printing powder and the like formed on the preset area A, so as to delay the cooling speed of the printing powder and the printed layers, reduce the internal stress of the workpiece formed by printing, and improve the printing quality. The bearing member 31 can play a heat insulation effect to prevent the heat generated by the heating member 32 from damaging other structures (such as the second displacement device 22) of the 3D printer 100. In addition, in the application mode of the present embodiment, the heating member 32 can heat the first workpiece, thereby improving the welding effect of the printed layers of the first workpiece and the second workpiece in the printing process.
[0126] In some embodiments, referring to and
[0127] , the bearing member 31 is provided with a mounting groove C on the side close to the print head 10, the heating member 32 is mounted in the mounting groove C, and the platform member 33 covers the opening of the mounting groove C. In this way, the heating member 32 can be mounted in a closed manner to avoid direct contact with the heating member 32 when the operator misoperates, thereby improving the operation safety of the 3D printer 100. Figure 9 Figure 10 In some embodiments, referring to and
[0128] , the bearing member 31 is provided with a mounting groove C on the side close to the print head 10, the heating member 32 is mounted in the mounting groove C, and the platform member 33 covers the opening of the mounting groove C. In this way, the heating member 32 can be mounted in a closed manner to avoid direct contact with the heating member 32 when the operator misoperates, thereby improving the operation safety of the 3D printer 100. Figure 9 Figure 10The carrier 31 comprises a carrier plate 311 and a connecting portion 312. The mounting groove C is formed in the carrier plate 311, and the connecting portion 312 is protrudingly arranged on the groove bottom surface of the mounting groove C. The heating element 32 is provided with an avoiding hole K1, and the connecting portion 312 is accommodated in the avoiding hole K1. In this way, the installation reliability of the heating element 32 can be improved by the cooperation of the connecting portion 312 and the avoiding hole K1, and the heating element 32 is stably accommodated in the mounting groove C. In addition, the connecting portion 312 can further play a heat insulation role to improve the heat insulation effect. In addition, in the embodiment, the second workpiece can be arranged at a position corresponding to the connecting portion 312 of the platform assembly 33, and the printing area is located outside the connecting portion 312, so that the normal printing can be ensured.
[0129] In other embodiments, the connecting portion 312 can also be arranged at the edge of the carrier plate 311. The carrier 31 can be connected to the second displacement device 22 in various ways, and the embodiment does not make specific limitations.
[0130] In some embodiments, referring to Figure 9 and Figure 10 , the connecting portion 312 is provided with a fastening hole K2 penetrating in the second direction X2. The fastening hole K2 penetrates the connecting portion 312 and the carrier plate 311, and is configured to be connected to the second displacement device 22 through a fastening structure. The second displacement device 22 is used to drive the platform assembly 30 to move relative to the print head 10. In this way, the connection length of the fastening structure and the carrier 31 can be improved, so as to ensure the connection reliability of the carrier 31 and the second displacement device 22.
[0131] In some embodiments, referring to Figure 10 , the 3D printer 100 further comprises a second connecting piece 52. The second connecting piece 52 connects the carrier plate 311 and the second displacement device 22. The second connecting piece 52 is T-shaped, and the cross-sectional area of the end of the second connecting piece 52 connected to the carrier plate 311 is larger. In this way, the connection stability between the second connecting piece 52 and the carrier plate 311 can be improved, and the support reliability of the platform assembly 30 can be improved.
[0132] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.
Claims
1. A printhead, characterized by, The laser module, the powder ejection module and the protective gas ejection module are provided; The laser module has a first side and a second side arranged opposite to each other along a first direction, the powder ejection module is connected to the first side, the protective gas ejection module is connected to the second side, and the laser module is provided with a laser exit surface on one side along a second direction, the laser exit surface is configured to emit laser, and the second direction intersects the first direction; The powder ejection module defines a powder delivery cavity for ejecting printing powder along a third direction towards a preset area, the third direction intersects the first direction, and a cross-sectional area of the powder delivery cavity gradually decreases in a direction close to the laser exit surface; The protective gas ejection module defines a protective gas delivery cavity for ejecting protective gas along a fourth direction towards the preset area, the fourth direction intersects the first direction, and a cross-sectional area of the protective gas delivery cavity gradually decreases in a direction close to the laser exit surface.
2. The print head according to claim 1, wherein: The powder ejection module and the protective gas ejection module gradually decrease in spacing along the first direction in a direction close to the laser exit surface, so that the second direction, the third direction and the fourth direction intersect at a common intersection point, and the intersection point is located in the preset area.
3. The print head according to claim 1, wherein: The powder ejection module includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the second side wall are spaced apart along the first direction, the third side wall and the fourth side wall are spaced apart along a fifth direction, the first side wall, the second side wall, the third side wall and the fourth side wall are sequentially connected and surround the powder delivery cavity, the fifth direction intersects the first direction, and the first side wall and the second side wall gradually decrease in spacing in a direction close to the laser exit surface.
4. The print head according to claim 1, wherein: The protective gas ejection module includes a fifth side wall, a sixth side wall, a seventh side wall and an eighth side wall, the fifth side wall and the sixth side wall are spaced apart along the first direction, the seventh side wall and the eighth side wall are spaced apart along the fifth direction, the fifth side wall, the sixth side wall, the seventh side wall and the eighth side wall are sequentially connected and surround the powder delivery cavity, the fifth direction intersects the first direction, and the fifth side wall and the sixth side wall gradually decrease in spacing in a direction close to the laser exit surface.
5. A 3D printer characterized by, The print head according to any one of claims 1 to 4; A platform assembly movably arranged on one side of the print head, the platform assembly being provided with the preset area. The 3D printer further includes:
6. The 3D printer of claim 5, wherein, A first displacement device; A first connecting member drivingly connected to the first displacement device, one end of the first connecting member extending out of the first displacement device along a fifth direction, and the print head being connected to the one end of the first connecting member extending out of the first displacement device. The platform assembly includes:
7. The 3D printer of claim 5, wherein, A carrier; A heating member is arranged on the bearing member close to the print head; A platform member is arranged on the heating member close to the print head, and a surface of the platform member close to the print head is provided with the preset area.
8. The 3D printer according to claim 7, characterized in that: The side of the bearing member close to the print head is provided with a mounting groove, the heating member is mounted in the mounting groove, and the platform member is arranged on the groove opening of the mounting groove.
9. The 3D printer according to claim 8, characterized in that: The bearing member comprises a bearing plate and a connecting portion, the mounting groove is arranged on the bearing plate, the connecting portion is protrudingly arranged on the groove bottom surface of the mounting groove, the heating member is provided with an avoiding hole, and the connecting portion is accommodated in the avoiding hole.
10. The 3D printer according to claim 9, characterized in that: The 3D printer further comprises a second displacement device; The connecting portion is provided with a fastening hole penetrating in a second direction, the fastening hole penetrates the connecting portion and the bearing plate, the fastening hole is configured to be connected with the second displacement device through a fastening structure, and the second displacement device is used to drive the platform assembly to move relative to the print head.