Spray head unit and 3D printing equipment applying same

Abstract

The embodiment of the utility model provides a spray head unit and 3D printing equipment applying the same. The spray head unit is provided with a conveying channel, the conveying channel is used for conveying consumables, and the spray head unit further comprises a nozzle assembly and a material cutting assembly. The conveying channel penetrates through the nozzle assembly in the axial direction. The material cutting assembly comprises a material cutting part and a cam part, the cam part is constructed to be arranged in a rotating mode, the cam part comprises a protruding first connecting end, the material cutting part is movably connected with the first connecting end, and the material cutting part is constructed to be driven to intrude into or retreat from the conveying channel. The 3D printing equipment comprises a forming platform, a driving unit and the nozzle unit, and the driving unit drives the nozzle unit to move relative to the forming platform.

Description

Technical Field

[0001] This application relates to the field of 3D printing, and particularly to a nozzle unit and a 3D printing device applying the same. Background Art

[0002] 3D printing technology is a rapid prototyping technology that uses a digital model file as a basis and applies special wax materials, powdered metals, plastics, or other bondable materials to manufacture three-dimensional objects by printing layer upon layer of materials. Fused deposition modeling is one of the main 3D printing technologies. This technology melts a thermoplastic filament and extrudes it from a nozzle, depositing it on a forming platform or the previously cured material layer by layer to finally generate a physical object. During 3D printing, it may be necessary to replace the consumables, and a relatively common method is to cut off the consumables and then replace them. How to optimize this process is something that those skilled in the art need to consider. Summary of the Utility Model

[0003] To solve the problems in the prior art, an embodiment of this application provides a nozzle unit and a 3D printing device applying the same.

[0004] An embodiment of this application provides a nozzle unit, which has a transmission channel for transmitting consumables. The nozzle unit further includes a nozzle assembly and a material cutting component. The transmission channel axially penetrates the nozzle assembly. The material cutting component includes a material cutting member and a cam portion. The cam portion is configured to be rotatably arranged. The cam portion includes a protruding first connection end. The material cutting member is movably connected to the first connection end and is configured to be driven to invade or withdraw from the transmission channel.

[0005] In one embodiment, the material cutting member includes a tool handle portion. The tool handle portion includes a connecting rod and a clamping arm. The clamping arm has an arc-shaped outer surface on the side away from the connecting rod. The first connection end is formed with a clamping groove having an arc-shaped inner surface. The clamping arm is movably clamped in the clamping groove, and the outer surface is separably in contact with the inner surface. The tool handle portion is movably connected to the first connection end through the clamping arm.

[0006] In one embodiment, the cam portion further includes a second connection end, which is rotatably connected to the nozzle assembly. The engaging groove is recessed from the side of the first connection end away from the second connection end toward the side where the second connection end is located. On the side of the first connection end away from the second connection end, there are two protrusions spaced apart on both sides of the engaging groove. The engaging arm is located between the two protrusions. On one side of the connecting rod connecting the engaging arm, two grooves are formed, and the two grooves are respectively located on the opposite sides of the engaging arm. The two grooves are recessed from the connecting rod toward the side away from the cam portion, and the two grooves are respectively used to accommodate the two protrusions.

[0007] In one embodiment, the material cutting member further includes a blade portion, and the handle portion further includes a push block. The connecting rod includes a first end portion and a second end portion spaced apart along a feed direction. The engaging arm is located between the first end portion and the second end portion. The first end portion is connected to the blade portion, and the second end portion is connected to the push block. The push block is configured to be able to extend out of the nozzle unit, and the push block is used to be pushed so that the connecting rod drives the blade portion to penetrate into the transmission channel along the feed direction.

[0008] In one embodiment, the nozzle unit further includes a reset assembly, and the nozzle assembly includes a heat dissipation portion. The reset assembly is respectively connected to the heat dissipation portion and the material cutting assembly. The heat dissipation portion is provided with a receiving cavity, and the reset assembly is disposed in the receiving cavity and is located between the transmission channel and the material cutting assembly along a feed direction. The reset assembly is used to push the material cutting assembly to reset so that the material cutting member exits the transmission channel along the feed direction.

[0009] In one embodiment, the reset assembly includes an elastic member. The receiving cavity has a first opening facing the cam portion. One end of the elastic member close to the transmission channel is disposed in the receiving cavity and abuts against the heat dissipation portion, and the other end of the elastic member away from the transmission channel extends out of the receiving cavity through the first opening and abuts against the cam portion.

[0010] In one embodiment, the reset assembly includes an elastic member and an elastic connection seat. The receiving cavity has a second opening facing the material cutting member. The elastic member is disposed in the receiving cavity. One end of the elastic member close to the transmission channel is disposed in the receiving cavity and abuts against the heat dissipation portion, and the other end of the elastic member away from the transmission channel is connected to the elastic connection seat. The elastic connection seat extends out of the receiving cavity through the second opening and is connected to the material cutting member.

[0011] In one embodiment, the nozzle assembly includes a heat dissipation part, the cam part is rotatably connected to the heat dissipation part, the heat dissipation part includes a connection body, heat dissipation fins and a guiding boss, the connection body includes a first connection part and a second connection part which are connected, the heat dissipation fins are connected to the first connection part, the guiding boss is arranged on the first connection part, the transmission channel axially penetrates through the first connection part and the guiding boss, the second connection part is arranged on one side of the first connection part along a feed direction, the second connection part is provided with an installation groove, the cam part is arranged in the installation groove and is rotatably connected to the second connection part, and the material cutting part and the guiding boss are located on the same side of the connection body.

[0012] In one embodiment, the nozzle unit further includes an extrusion assembly and a housing, the extrusion assembly and the nozzle assembly are respectively connected to the housing and are received in the housing, the transmission channel axially penetrates through the extrusion assembly and the nozzle assembly in sequence, at least a section of the area of the transmission channel between the extrusion assembly and the nozzle assembly is exposed, the material cutting assembly is arranged between the extrusion assembly and the nozzle assembly and can movably invade or withdraw from the transmission channel, the material cutting part includes a push block, and the housing is provided with a through hole, and the push block extends out of the housing through the through hole.

[0013] An embodiment of the present application further provides a 3D printing device, which includes a forming platform, a driving unit and the nozzle unit as described in any one of the foregoing embodiments, and the driving unit drives the nozzle unit to move relative to the forming platform.

[0014] It can be understood that in the nozzle unit of the present application and the 3D printing device applying the same, the cam part is configured to be rotatably arranged, the convex first connection end of the cam part is connected to the material cutting part, and during the rotation of the cam part relative to the nozzle assembly, the convex first connection end can amplify the rotation path of the cam part, so that the material cutting part can move with the cam part as a connection node and invade or withdraw from the transmission channel to realize the cutting of the consumable material. Description of the Drawings

[0015] Figure 1 It is a three-dimensional schematic diagram of the nozzle unit provided by the embodiment of the present application.

[0016] Figure 2 It is a partial three-dimensional schematic diagram of the nozzle unit provided by the embodiment of the present application.

[0017] Figure 3 It is a three-dimensional schematic diagram of the nozzle assembly of the nozzle unit provided by the embodiment of the present application.

[0018] Figure 4 It is a three-dimensional schematic diagram of the material cutting assembly of the nozzle unit provided by the embodiment of the present application.

[0019] Figure 5 A three-dimensional schematic diagram of the cam portion of the material cutoff assembly of the nozzle unit provided by an embodiment of the present application.

[0020] Figure 6 A three-dimensional schematic diagram of the material cutoff member of the material cutoff assembly of the nozzle unit provided by an embodiment of the present application.

[0021] Figure 7 An assembly schematic diagram of the reset assembly of the nozzle unit provided by an embodiment of the present application.

[0022] Figure 8 An assembly schematic diagram of the reset assembly of the nozzle unit provided by another embodiment of the present application.

[0023] Figure 9 A three-dimensional schematic diagram of the 3D printing device provided by an embodiment of the present application.

[0024] Description of main element symbols

[0025] Nozzle unit 10

[0026] Transfer channel 100

[0027] Shell 11

[0028] First outer shell 111

[0029] Second outer shell 112

[0030] Third outer shell 113

[0031] Through hole 1131

[0032] Extrusion assembly 12

[0033] Extrusion driving member 121

[0034] Extrusion gear 122

[0035] First profiling structure 123

[0036] Nozzle assembly 13

[0037] Heat dissipation part 131

[0038] Connection main body 1310

[0039] First connection part 1311

[0040] Second connection part 1312

[0041] Installation groove 13121

[0042] Accommodation cavity 13122

[0043] First opening 13123

[0044] Second opening 13124

[0045] Radiating fin 1313

[0046] Guide boss 1314

[0047] Guide groove 13140

[0048] Heating part 132

[0049] Nozzle part 133

[0050] Stock-breaking assembly 14

[0051] Stock-breaking piece 141

[0052] Tool shank part 1411

[0053] Second profiling structure 14110

[0054] Connecting rod 14111

[0055] First end 14112

[0056] Second end 14113

[0057] Engaging arm 14114

[0058] Outer surface 14115

[0059] Groove 14116

[0060] Blade part 1412

[0061] Pusher block 1413

[0062] Cam part 142

[0063] First connection end 1421

[0064] Engaging groove 14210

[0065] Protrusion 14211

[0066] Inner surface 14212

[0067] Second connection end 1422

[0068] Reset assembly 16

[0069] Elastic part 161

[0070] Elastic connection seat 162

[0071] Feed direction T

[0072] 3D printing device 1

[0073] Forming platform 17

[0074] Drive unit 18

[0075] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific embodiments

[0076] The following description will describe the content of the present application more comprehensively with reference to the drawings. The exemplary embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components. The terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. In addition, when used herein, "comprises" and / or "comprising" and / or "has", integers, steps, operations, components and / or components, but does not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof. Unless otherwise defined, all terms (including 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. In addition, unless clearly defined in the text, terms such as those defined in a general dictionary should be construed to have a meaning consistent with their meaning in the relevant art and the content of this application, and will not be construed as idealized or overly formal meanings.

[0077] Generally, 3D printing technology is a rapid prototyping technology that uses a digital model file as a basis and applies special wax materials, powdered metals, plastics and other bondable materials to manufacture three-dimensional objects by printing layer upon layer of materials. Fused deposition modeling is one of the main 3D printing technologies. This technology melts the hot-melt filament and extrudes it from the nozzle, depositing it on the forming platform or the previously cured material of the previous layer, and finally generating a physical object. During the 3D printing process, it may be necessary to replace the consumables. A relatively common method is to cut off the consumables and then replace them. How to optimize this process is something that those skilled in the art need to consider.

[0078] Correspondingly, an embodiment of the present application provides a nozzle unit and a 3D printing device using the same. The nozzle unit has a transmission channel for transmitting consumables. The nozzle unit further includes a nozzle assembly and a material cutting assembly. The transmission channel axially penetrates through the nozzle assembly. The material cutting assembly includes a material cutting member and a cam portion. The cam portion is rotatably connected to a heat dissipation portion. The cam portion is configured to be rotatably arranged. The material cutting member is movably connected to a first connection end. The material cutting member is configured to be driven to invade or withdraw from the transmission channel. The 3D printing device includes a forming platform, a driving unit, and the aforementioned nozzle unit. The driving unit drives the nozzle unit to move relative to the forming platform.

[0079] Furthermore, in the nozzle unit of the present application and the 3D printing device using the same, the cam portion is configured to be rotatably arranged. The convex first connection end of the cam portion is connected to the material cutting member. During the rotation of the cam portion relative to the nozzle assembly, the convexly arranged first connection end can amplify the rotation path of the cam portion, enabling the material cutting member to move with the cam portion as a connection node and invade or withdraw from the transmission channel to cut off the consumables.

[0080] Those skilled in the art can understand that "3D printing" refers to a technology that constructs an object by layer-by-layer printing based on a digital model file, using powdered metals, plastics, or other bondable materials.

[0081] The following content will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; identical or similar components will be denoted by the same or similar reference numerals or similar technical terms.

[0082] The following will refer to the accompanying drawings to further describe in detail the specific embodiments of the present application.

[0083] As Figure 1 and Figure 2 shown, an embodiment of the present application provides a nozzle unit 10 having a transmission channel 100 for transmitting consumables (not shown in the figure). The nozzle unit 10 further includes a nozzle assembly 13, a material cutting assembly 14, an extrusion assembly 12, and a housing 11. The extrusion assembly 12 and the nozzle assembly 13 are respectively connected to the housing 11 and housed within the housing 11. The transmission channel 100 axially penetrates through the extrusion assembly 12 and the nozzle assembly 13 in sequence; that is, during the operation of the nozzle unit 10, the consumables can enter the nozzle unit 10 from one side of the extrusion assembly 12, and further be conveyed to the nozzle assembly 13 and extruded by the nozzle assembly 13. At least a section of the transmission channel 100 between the extrusion assembly 12 and the nozzle assembly 13 is exposed. The material cutting assembly 14 is disposed between the extrusion assembly 12 and the nozzle assembly 13 and can movably invade or withdraw from the transmission channel 100 through at least a section of the exposed area of the transmission channel 100 to cut off the consumables.

[0084] In one embodiment, the transmission channel 100 axially penetrates through the nozzle assembly 13. The material cutoff assembly 14 includes a material cutoff member 141 and a cam portion 142. The cam portion 142 is configured to be rotatably arranged. The cam portion 142 includes a protruding first connection end 1421. The material cutoff member 141 is movably connected to the first connection end 1421. The material cutoff member 141 is configured to be driven to invade or withdraw from the transmission channel 100.

[0085] It can be understood that for the nozzle unit 10 of the present application and the 3D printing device 1 using the same, the cam portion 142 is configured to be rotatably arranged. The protruding first connection end 1421 in the cam portion 142 is connected to the material cutoff member 141. During the rotation of the cam portion 142 relative to the nozzle assembly 13, the protruding first connection end 1421 can amplify the rotation path of the cam portion 142, enabling the material cutoff member 141 to move with the cam portion 142 as a connection node and invade or withdraw from the transmission channel 100 to achieve the cutting of the consumable material.

[0086] In this embodiment, the nozzle assembly 13 includes a heat dissipation portion 131. The cam portion 142 is rotatably connected to the heat dissipation portion 131.

[0087] It can be understood that the transmission channel 100 axially penetrates through the heat dissipation portion 131. The material cutoff member 141 is connected to the heat dissipation portion 131 through the cam portion 142, bringing the material cutoff member 141 closer to the transmission channel 100 and making the structure of the nozzle unit 10 more compact.

[0088] In other embodiments, the cam portion 142 can also be rotatably connected to other structures on the nozzle unit 10, such as the housing 11 or other supporting structures within the nozzle unit 10.

[0089] Further in combination with Figure 1 and Figure 2 As shown, in one embodiment, the housing 11 includes a first outer shell 111, a second outer shell 112, and a third outer shell 113. The first outer shell 111 and the second outer shell 112 are respectively located on opposite sides of the third outer shell 113, and the first outer shell 111 and the second outer shell 112 are respectively connected to the third outer shell 113. The first outer shell 111 is connected to the extrusion assembly 12, and the extrusion assembly 12 is received within the first outer shell 111; the second outer shell 112 is connected to the nozzle assembly 13, and the second outer shell 112 is used to accommodate the heat dissipation assembly (not shown in the figure) of the nozzle unit 10; the third outer shell 113 covers the front of the nozzle unit 10 from the front view angle, and is used to accommodate the nozzle assembly 13 and shield the extrusion assembly 12.

[0090] In one embodiment, the material cutting member 141 includes a pushing block 1413. The housing 11 is provided with a through hole 1131, and the pushing block 1413 extends out of the housing 11 through the through hole 1131. In this embodiment, the through hole 1131 is formed in the third housing 113, and the aperture of the through hole 1131 is slightly larger than the outer diameter of the pushing block 1413, so that the pushing block 1413 can extend out of the housing 11 through the through hole 1131, enabling the pushing block 1413 to follow the overall movement of the nozzle unit 10 to collide with an external structure (such as the Z-axis of the 3D printing device 1), thereby driving the movement of the material cutting member 141 to achieve the cutting of the consumable material.

[0091] In one embodiment, the extrusion assembly 12 at least includes an extrusion driving member 121 and an extrusion gear 122. The extrusion driving member 121 is drivingly connected to the extrusion gear 122, and the transmission channel 100 passes through the extrusion gear 122. The extrusion gear 122 clamps the consumable material and sends it to the nozzle assembly 13. It can be understood that the structures of the extrusion driving member 121 and the pair of extrusion gears 122 can be known and feasible structures, such as the cooperation of a driving motor, a driving wheel and a driven wheel, etc., which will not be elaborated here.

[0092] In one embodiment, the nozzle assembly 13 further includes a heating part 132 and a nozzle part 133. The heat dissipation part 131 and the heating part 132 are respectively connected to the nozzle part 133. The heating part 132 can heat the nozzle part 133 to melt the consumable material located therebetween. The heat dissipation part 131 is thermally coupled to the nozzle part 133 and / or the heating part 132 to achieve heat dissipation of the nozzle assembly 13. In this embodiment, the throat (not shown in the figure) of the nozzle part 133 can extend into the transmission channel 100 located in the heat dissipation part 131 and communicate with the transmission channel 100 in the heat dissipation part 131, or extend to the side of the heat dissipation part 131 close to the extrusion assembly 12 to correspond to the transmission channel 100 in the extrusion assembly 12, but the throat does not interfere with the feeding and retracting of the material cutting member 141. It can be understood that the structures of the heating part 132 and the nozzle part 133 can be known and feasible structures, which will not be elaborated here.

[0093] Further combined with Figure 3As shown, in one embodiment, the heat dissipation part 131 includes a connection main body 1310, heat dissipation fins 1313, and a guiding boss 1314. The connection main body 1310 includes a first connection part 1311 and a second connection part 1312 which are connected. The heat dissipation fins 1313 are connected to the first connection part 1311. The guiding boss 1314 is arranged on the first connection part 1311. The transmission channel 100 axially penetrates through the first connection part 1311 and the guiding boss 1314. The second connection part 1312 is arranged on one side of the first connection part 1311 along a feed direction T. An installation groove 13121 is formed in the second connection part 1312. The cam part 142 is arranged in the installation groove 13121 and is rotatably connected to the second connection part 1312. The blanking part 141 and the guiding boss 1314 are located on the same side of the connection main body 1310. It can be understood that the cam part 142 and the heat dissipation part 131 can be rotatably connected through a rotating shaft (not shown in the figure), and those skilled in the art can understand that this is surely feasible.

[0094] In this embodiment, both the heat dissipation fins 1313 and the guiding boss 1314 are arranged on the first connection part 1311, and the nozzle part 133 and the heating part 132 are also correspondingly arranged with the first connection part 1311. The transmission channel 100 axially penetrates through the extrusion assembly 12, the first connection part 1311, the nozzle part 133, and the heating part 132 in sequence. The second connection part 1312 is connected to the first connection part 1311 and can be integrally arranged. The second connection part 1312 is located on one side of the first connection part 1311 along the feed direction T to avoid interfering with the extrusion assembly 12, the nozzle part 133, and the heating part 132. The installation groove 13121 is formed on the second connection part 1312 close to the side where the extrusion assembly 12 is located. The installation groove 13121 is used to accommodate the cam part 142. Both the side of the installation groove 13121 away from the first connection part 1311 and the side facing the extrusion assembly 12 can be of an open structure to avoid interfering with the blanking part 141 and the cam part 142 and prevent the movement of the blanking part 141 and the cam part 142 from causing interference.

[0095] It can be understood that by expanding and setting the second connection part 1312 on the basis of the first connection part 1311, the heat dissipation part 131 can load the blanking assembly 14 without interfering with other structures such as the heat dissipation fins 1313. There is no need to add other connection brackets in the nozzle unit 10 to connect the blanking assembly 14; moreover, the second connection part 1312 can also be accommodated in the housing 11, and the second connection part 1312 does not need to occupy the space of other structures; thus, the overall structure of the nozzle unit is more compact.

[0096] In this embodiment, a guiding groove 13140 for guiding the blade part 1412 of the blanking part 141 can be arranged on the side of the guiding boss 1314 away from the first connection part 1311, and the transmission channel 100 is exposed at the position corresponding to the guiding groove 13140.

[0097] Further combined with Figures 4 to 6 As shown, in one embodiment, the cam portion 142 is a cam-shaped structure. The cam portion 142 includes a first connection end 1421 and a second connection end 1422 which are connected. The second connection end 1422 corresponds to the rotation axis of the cam portion 142. The second connection end 1422 is rotatably connected to the heat dissipation portion 131. The first connection end 1421 corresponds to the protruding structure of the cam portion 142. The first connection end 1421 protrudes relative to the second connection end 1422; that is, the second connection end 1422 and the first connection portion 1311 of the connection main body 1310 can achieve coaxial rotational connection through the connection relationship of the through hole cooperating with a rotating shaft or a pin (not shown in the figure). The second connection end 1422 rotates and drives the first connection end 1421 to approach or move away from the transmission channel 100. The blanking member 141 includes a tool handle portion 1411 and a blade portion 1412. The tool handle portion 1411 is connected to the blade portion 1412. The tool handle portion 1411 is connected to the first connection end 1421 of the cam portion 142. One end of the tool handle portion 1411 is a push block 1413, and the other end of the tool handle portion 1411 is connected to the blade portion 1412; that is, the cam portion 142 is movably connected to the heat dissipation portion 131.

[0098] In one embodiment, the tool handle portion 1411 includes a connecting rod 14111 and a clamping arm 14114 which are connected. The clamping arm 14114 has an arc-shaped outer surface 14115 on the side away from the connecting rod 14111. The first connection end 1421 is formed with a clamping groove 14210 which has an arc-shaped inner surface 14212. The clamping arm 14114 is movably clamped in the clamping groove 14210. The outer surface 14115 and the inner surface 14212 are separably in contact. The tool handle portion 1411 is movably connected to the first connection end 1421 through the clamping arm 14114.

[0099] It can be understood that the arc-shaped inner surface 14212 and the arc-shaped outer surface 14115 cooperate with each other to make the clamping arm 14114 rotatably connected to the first end portion 14112; that is, the clamping arm 14114 can remain connected to the first end portion 14112, and at the same time, the clamping arm 14114 can rotate relative to the first end portion 14112, so that the blanking member 141 can achieve feeding substantially along the feeding direction T. In this embodiment, the side of the clamping arm 14114 away from the connecting rod 14111 is spherical, and its outer diameter is larger than that of the side of the clamping arm 14114 close to the connecting rod 14111. Correspondingly, the inner diameter of the inner cavity of the clamping groove 14210 is slightly larger than the inner diameter of its opening, so that the clamping arm 14114 is not easily disengaged from the clamping groove 14210.

[0100] In one embodiment, the engaging groove 14210 is formed by the first connecting end 1421 being recessed toward the second connecting end 1422 on the side where the second connecting end 1422 is located. The first connecting end 1421 is provided with two protrusions 14211 spaced apart on both sides of the engaging groove 14210 on the side away from the second connecting end 1422, and the engaging arm 14114 is located between the two protrusions 14211. The connecting rod 14111 is used to form two grooves 14116 on one side of the engaging arm 14114, and the two grooves 14116 are respectively located on the opposite sides of the engaging arm 14114, and the two grooves 14116 are recessed by the connecting rod 14111 toward the side away from the cam portion 142, and the two grooves 14116 are respectively used to accommodate the two protrusions 14211.

[0101] It can be understood that when the cutting piece 141 is advancing or retreating along the feed direction T, the cam portion 142 rotates, and one of the two protrusions 14211 is closer to the connecting rod 14111 than the other. In order to avoid interference with the movement of the connecting rod 14111 along the feed direction T, a groove 14116 is provided in the area where the connecting rod 14111 may contact the protrusion 14211 to avoid the protrusion 14211.

[0102] In one embodiment, the connecting rod 14111 includes a first end 14112 and a second end 14113 spaced apart along the feed direction T, the engaging arm 14114 is located between the first end 14112 and the second end 14113, the first end 14112 is connected to the blade portion 1412, and the second end 14113 is connected to the push block 1413. The push block 1413 is configured to extend out of the spray head unit 10, and the push block 1413 is used to be pushed so that the connecting rod 14111 drives the blade portion 1412 to invade the transmission channel 100 along the feed direction T.

[0103] Further integration Figure 2 and Figure 6 As shown, in one embodiment, the shell of the extrusion assembly 12 has a first profiling structure 123, and the first profiling structure 123 has a substantially arc-shaped edge and is substantially step-shaped; the handle portion 1411 has a second profiling structure 14110 on the side facing the extrusion assembly 12 along the feed direction T, and the second profiling structure 14110 has a substantially arc-shaped edge and is substantially step-shaped, and the second profiling structure 14110 has a smaller thickness on the side close to the first profiling structure 123. It can be understood that the shapes of the first profiling structure 123 and the second profiling structure 14110 are substantially matched, which can avoid hard contact when the handle portion 1411 moves along the feed direction T to contact the shell of the extrusion assembly 12, and can extend the feed distance of the handle portion 1411 and improve the overall space utilization.

[0104] Further integration Figure 7 and Figure 8As shown, Figure 7 and Figure 8 are Figure 2 shown in a sectional view along the VII-VII direction. In one embodiment, the nozzle unit 10 further includes a reset assembly 16. The reset assembly 16 is respectively connected to the heat dissipation part 131 and the material cutting-off assembly 14. The heat dissipation part 131 is provided with a receiving cavity 13122. The reset assembly 16 is arranged in the receiving cavity 13122 and is located between the transmission channel 100 and the material cutting-off assembly 14 along a feed direction T. The reset assembly 16 is used to push the material cutting-off assembly 14 to reset, so that the material cutting member 141 withdraws from the transmission channel 100 along the feed direction T.

[0105] It can be understood that the engaging arm 14114 is arranged between the first end 14112 and the second end 14113. When the push block 1413 is pushed, the tool handle part 1411 is driven to move towards the side where the transmission channel 100 is located. The tool handle part 1411 rotates relative to the cam part 142, and the tool handle part 1411 drives the cutting edge part 1412 to invade the transmission channel 100 along the feed direction T. The reset assembly 16 is arranged between the transmission channel 100 and the material cutting-off assembly 14. After the external force applied to the push block 1413 is removed, the reset assembly 16 deforms and drives the tool handle part 1411 to move away from the side where the transmission channel 100 is located. The tool handle part 1411 rotates relative to the cam part 142, and the tool handle part 1411 drives the cutting edge part 1412 to withdraw from the transmission channel 100 along the feed direction T.

[0106] Further combined with Figure 7 As shown, in one embodiment, the reset assembly 16 includes an elastic member 161. The receiving cavity 13122 has a first opening 13123 facing the cam part 142. One end of the elastic member 161 close to the transmission channel 100 is arranged in the receiving cavity 13122 and abuts against the heat dissipation part 131, and the other end of the elastic member 161 away from the transmission channel 100 extends out of the receiving cavity 13122 through the first opening 13123 and abuts against the cam part 142.

[0107] It can be understood that the elastic member 161 can directly push the cam part 142 to rotate, and then the cam part 142 drives the tool handle part 1411 to move away from the side where the transmission channel 100 is located, and drives the cutting edge part 1412 to withdraw from the transmission channel 100 along the feed direction T.

[0108] Further combined with Figure 8As shown, in one embodiment, the reset assembly 16 includes an elastic member 161 and an elastic connection seat 162. The accommodation cavity 13122 has a second opening 13124 facing the blanking member 141. The elastic member 161 is disposed in the accommodation cavity 13122. One end of the elastic member 161 close to the transmission channel 100 is disposed in the accommodation cavity 13122 and abuts against the heat dissipation portion 131. The other end of the elastic member 161 away from the transmission channel 100 is connected to the elastic connection seat 162. The elastic connection seat 162 extends out of the accommodation cavity 13122 through the second opening 13124 and is connected to the blanking member 141.

[0109] It can be understood that the elastic member 161 drives the tool holder portion 1411 to move away from the side where the transmission channel 100 is located through the elastic connection seat 162, and drives the cutting edge portion 1412 to withdraw from the transmission channel 100 along the feed direction T.

[0110] In this embodiment, the reset assembly 16 is reset by elastic force. In other embodiments, the reset assembly 16 can also be reset by other forces such as magnetic force that have a correlation relationship with distance, displacement, and deformation.

[0111] Further in combination with Figure 9 As shown, an embodiment of the present application further provides a 3D printing device 1, which includes a forming platform 17, a driving unit 18, and a nozzle unit 10 as described in any one of the foregoing embodiments. The driving unit 18 drives the nozzle unit 10 to move relative to the forming platform 17.

[0112] In the foregoing, the specific embodiments of the present application have been described with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that various changes and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. These changes and substitutions all fall within the scope defined by the present application.

Claims

1. A nozzle unit having a transmission channel for transmitting consumables, characterized in that: The nozzle unit also includes: A nozzle assembly, wherein the transmission channel axially penetrates the nozzle assembly; The material-breaking component comprises a material-breaking piece and a cam portion, wherein the cam portion is configured to be rotatably arranged, the cam portion comprises a protruding first connecting end, the material-breaking piece is movably connected to the first connecting end, and the material-breaking piece is configured to be driven and invade or exit the transmission channel.

2. The nozzle unit according to claim 1, characterized in that The material-cutting piece includes a shank portion, which includes a connected connecting rod and a locking arm, the locking arm having an arc-shaped outer surface on the side away from the connecting rod, a locking groove is formed at the first connecting end, the locking groove has an arc-shaped inner surface, the locking arm can be movably clamped in the locking groove, the outer surface and the inner surface can be detachably contacted, and the shank portion is movably connected to the first connecting end via the locking arm.

3. The nozzle unit according to claim 2, characterized in that The cam portion also includes a second connecting end, which is rotatably connected to the nozzle assembly. The engaging groove is formed by the first connecting end being recessed on a side away from the second connecting end toward a side where the second connecting end is located. The first connecting end has two protrusions spaced apart on both sides of the engaging groove on a side away from the second connecting end. The engaging arm is located between the two protrusions. Two grooves are formed on a side of the connecting rod used to connect the engaging arm. The two grooves are respectively located on opposite sides of the engaging arm. The two grooves are recessed by the connecting rod toward a side away from the cam portion, and the two grooves are respectively used to accommodate the two protrusions.

4. The nozzle unit according to claim 2, characterized in that: The material breaking piece also includes a blade portion, the handle portion also includes a push block, the connecting rod includes a first end and a second end spaced apart along a feed direction, the locking arm is located between the first end and the second end, the first end is connected to the blade portion, the second end is connected to the push block, the push block is constructed to be able to extend out of the nozzle unit, and the push block is used to be pushed so that the connecting rod drives the blade portion to invade the transmission channel along the feed direction.

5. The nozzle unit according to claim 1, characterized in that: The nozzle unit also includes a reset component, the nozzle assembly includes a heat dissipation part, the reset component is respectively connected to the heat dissipation part and the material cutting component, the heat dissipation part is provided with a accommodating cavity, the reset component is arranged in the accommodating cavity and is located between the transmission channel and the material cutting component along a feed direction, and the reset component is used to push the material cutting component to reset so that the material cutting part exits the transmission channel along the feed direction.

6. The nozzle unit according to claim 5, characterized in that The reset assembly includes an elastic member, the accommodating cavity has a first opening arranged toward the cam portion, one end of the elastic member close to the transmission channel is arranged in the accommodating cavity and abuts against the heat dissipation portion, and the other end of the elastic member away from the transmission channel extends out of the accommodating cavity through the first opening and abuts against the cam portion.

7. The nozzle unit according to claim 5, characterized in that: The reset assembly includes an elastic member and an elastic connecting seat, the accommodating cavity has a second opening arranged toward the material-breaking member, the elastic member is arranged in the accommodating cavity, one end of the elastic member close to the transmission channel is arranged in the accommodating cavity and abuts against the heat dissipation part, and the other end of the elastic member away from the transmission channel is connected to the elastic connecting seat, and the elastic connecting seat extends out of the accommodating cavity through the second opening and is connected to the material-breaking member.

8. The nozzle unit according to claim 1, characterized in that: The nozzle assembly includes a heat dissipation part, the cam part is rotatably connected to the heat dissipation part, the heat dissipation part includes a connecting body, heat dissipation blades and a guide boss, the connecting body includes a first connecting part and a second connecting part that are connected, the heat dissipation blades are connected to the first connecting part, the guide boss is arranged on the first connecting part, the transmission channel axially penetrates the first connecting part and the guide boss, the second connecting part is arranged on one side of the first connecting part along a feed direction, the second connecting part is provided with a mounting groove, the cam part is arranged in the mounting groove and is rotatably connected to the second connecting part, and the material breaking piece and the guide boss are located on the same side of the connecting body.

9. The nozzle unit according to claim 1, characterized in that: The nozzle unit also includes an extrusion component and a shell, the extrusion component and the nozzle component are respectively connected to the shell and accommodated in the shell, the transmission channel is arranged to penetrate the extrusion component and the nozzle component in sequence along the axial direction, at least a section of the transmission channel between the extrusion component and the nozzle component is exposed, the material cutting component is arranged between the extrusion component and the nozzle component and can movably invade or withdraw from the transmission channel, the material cutting piece includes a push block, the shell is provided with a through hole, and the push block extends out of the shell through the through hole.

10. A 3D printing device, characterized in that: It comprises a molding platform, a driving unit and a nozzle unit as claimed in any one of claims 1 to 9, wherein the driving unit drives the nozzle unit to move relative to the molding platform.

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