Cutting assembly for 3D printer, extrusion mechanism and 3D printer

Abstract

The present application provides a cutting assembly for a 3D printer, an extrusion mechanism and the 3D printer. The cutting assembly comprises a mounting base, a first cutting arm, a second cutting arm, and a push rod. The push rod and the mounting base are arranged opposite to each other, an extrusion part is arranged on the side of the push rod facing the mounting base, and the extrusion part defines an extrusion space. One end of the first cutting arm is rotatably connected to the mounting base, and the other end of the first cutting arm is arranged in the extrusion space. One end of the second cutting arm and the first cutting arm are jointly and rotatably connected to the mounting base, and the other end of the second cutting arm is arranged in the extrusion space. The first cutting arm and the second cutting arm are arranged opposite to each other to define a cutting space, and in the cutting space, a cutter is arranged on the first cutting arm and / or the second cutting arm. When the first cutting arm and the second cutting arm apply force together, the cutter can move towards consumables in the cutting space to quickly cut off the consumables, and the cutting process is fast and efficient.

Description

Cutting assembly for 3D printer, extrusion mechanism for 3D printer and 3D printer

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410433491.2, filed on April 10, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of 3D printing equipment, in particular to a cutting assembly for a 3D printer, an extrusion mechanism for a 3D printer and a 3D printer. BACKGROUND

[0004] FDM (Fused Deposition Modeling) printing, i.e., fused deposition modeling, is a common 3D printing technology. In the process of FDM printing, a 3D model is first sliced into thin slices by slicing software. Then, the printer heats thermoplastic consumables to a molten state, and the material is sprayed layer by layer through a nozzle. The sprayed material cools and solidifies quickly, and through such layer-by-layer accumulation, a complete three-dimensional object is formed.

[0005] With the development of technology, consumers have increasingly high demands for 3D printing models. Existing FDM printing equipment usually only has the function of printing a single color model, i.e., only the same color model can be printed at a time, and models with multiple colors cannot be printed. For some 3D printers that support multi-color printing, when printing a model with multiple colors, the printing process needs to be interrupted, and different color consumables need to be replaced before the printing of another color can continue.

[0006] When changing the material, the consumable is withdrawn from the extruder nozzle. At this time, due to the high temperature of the nozzle, the front end of the consumable is still in a molten state, and direct extraction will cause the consumable to be pulled into a filament, which is not conducive to subsequent printing of the material. How to quickly and effectively shear the consumable in the extruder of the printer becomes a technical problem that needs to be solved urgently. SUMMARY

[0007] The present application provides a cutting assembly for a 3D printer, an extrusion mechanism for a 3D printer and a 3D printer to solve the above technical problems.

[0008] Embodiments of the present application are implemented as follows:

[0009] A cutting assembly for a 3D printer, comprising a mounting base, a first cutting arm, a second cutting arm and a push rod. The push rod is arranged opposite to the mounting base, and an extrusion member is arranged on the side of the push rod facing the mounting base, defining an extrusion space. One end of the first cutting arm is rotatably connected to the mounting base, and the other end is arranged in the extrusion space. One end of the second cutting arm is rotatably connected to the mounting base together with the first cutting arm, and the other end is arranged in the extrusion space. The first cutting arm and the second cutting arm are arranged opposite to each other, defining a cutting space, and a cutter is arranged on the first cutting arm and / or the second cutting arm in the cutting space.

[0010] In this way, when the push rod moves towards the mounting base under the action of an external force, the first cutting arm and the second cutting arm can extend further into the extrusion space, and the extrusion member pushes the first cutting arm and the second cutting arm closer to each other. Under the combined force of the first cutting arm and the second cutting arm, the cutter can move towards the consumable in the cutting space to quickly cut off the consumable, the cutting process is fast and effective, which is conducive to improving the material replacement rate, and the straight shape of the consumable will not be bent, so that a good cross section can be formed at the cut-off position of the consumable.

[0011] In a possible implementation, the extrusion member comprises a first extrusion member and a second extrusion member, and the extrusion space is formed between the first extrusion member and the second extrusion member; the first extrusion member is provided with a first pulley at an end away from the push rod, and the first pulley is in sliding fit with the outer side surface of the first cutting arm; and / or the second extrusion member is provided with a second pulley at an end away from the push rod, and the second pulley is in sliding fit with the outer side surface of the second cutting arm.

[0012] In a possible implementation, the first cutting arm comprises a first portion, a second portion and a third portion connected together, the first portion is rotatably connected to the mounting base, the cutter comprises a first cutter arranged on the side of the second portion facing the second cutting arm, the third portion is bent towards the second cutting arm, and the end of the third portion is accommodated in the extrusion space and in sliding fit with the first extrusion member; or / and the second cutting arm comprises a fourth portion, a fifth portion and a sixth portion connected together, the fourth portion is rotatably connected to the mounting base, and the fourth portion is arranged in stack with the first portion, the cutter comprises a second cutter arranged on the side of the fifth portion facing the second portion, the sixth portion is bent towards the first cutting arm, and the sixth portion is accommodated in the extrusion space and in sliding fit with the first extrusion member.

[0013] In a possible implementation, the third portion and the sixth portion are arranged in up-down staggered manner.

[0014] In a possible implementation, the width of the extrusion space gradually decreases in the direction away from the mounting base.

[0015] In a possible implementation, the push rod comprises a main body part, a rotating part and a pushing part, the rotating part is arranged at one end of the main body part and used to rotatably connect the main body part to an external structure, the pushing part is arranged at the other end of the main body part and used to apply an external force to the main body part, the pressing piece is connected to the side of the main body part facing the mounting base, and the distance between the pressing piece and the rotating part is smaller than the distance between the pressing piece and the pushing part.

[0016] In a possible implementation, the cutting assembly further comprises a reset piece, the reset piece is elastically arranged between the first cutting arm and the second cutting arm, or the reset piece is arranged at the rotatable connection between the first cutting arm, the second cutting arm and the mounting base and used to drive the first cutting arm and the second cutting arm to rotate reversely.

[0017] In a possible implementation, the first cutting arm is provided with a first positioning piece, the second cutting arm is provided with a second positioning piece, the first positioning piece and the second positioning piece are oppositely arranged, and the two ends of the reset piece are sleeved with the first positioning piece and the second positioning piece respectively.

[0018] In a possible implementation, the mounting base is further provided with a limiting piece, the limiting piece is arranged at the side of the first cutting arm away from the second cutting arm and used to block the first cutting arm.

[0019] The embodiment of the present application further provides an extrusion mechanism for a 3D printer, comprising an extrusion assembly and the cutting assembly for a 3D printer as described in the above embodiment, the extrusion assembly is connected to the mounting base of the cutting assembly, and the discharge end of the extrusion assembly is correspondingly arranged with the cutter of the cutting assembly.

[0020] The embodiment of the present application further provides a 3D printer, comprising a rack, a printing platform and the cutting assembly for a 3D printer as described in the above embodiment or the extrusion mechanism for a 3D printer as described in the above embodiment, the printing platform is movably assembled to the rack, and the cutting assembly or the extrusion mechanism is movably assembled to the rack and correspondingly arranged with the printing platform. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Fig. 1 is a structural schematic view of the cutting assembly for a 3D printer according to an embodiment of the present application.

[0023] Fig. 2 is a structural schematic view of the cutting assembly shown in Fig. 1 in another direction.

[0024] Fig. 3 is a top view of the material cutting assembly shown in Fig. 1 when not cutting material.

[0025] Fig. 4 is a top view of the material cutting assembly shown in Fig. 1 when cutting material.

[0026] Fig. 5 is an exploded structural schematic view of the material cutting assembly shown in Fig. 1.

[0027] Fig. 6 is a structural schematic view of an extrusion mechanism for a 3D printer according to an embodiment of the present application.

[0028] Fig. 7 is a structural schematic view of the extrusion mechanism shown in Fig. 6 when cutting material.

[0029] Fig. 8 is a structural schematic view of a 3D printer according to an embodiment of the present application.

[0030] Main element symbol explanation: cutting assembly 100 mounting seat 10 rotating pin 11 limiting piece 12 first mounting plate 13 second mounting plate 14 first cutting arm 20 first part 21 second part 22 third part 23 first cutter 24 first limiting piece 25 second cutting arm 30 fourth part 31 fifth part 32 sixth part 33 second cutter 34 second limiting piece 35 push rod 40 main body 41 first rod 411 second rod 412 rotating part 42 pushing part 43 rotating shaft 44 extrusion piece 50 first extrusion piece 51 second extrusion piece 52 extrusion space 53 first pulley 54 second pulley 55 reset piece 60 extrusion mechanism 200 extrusion assembly201 discharge end 202 3D printer 300 frame 301 printing platform 302 consumable 400 DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the 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 of the present application.

[0032] 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 intervening elements can also be present. When an element is referred to as being "connected" to or "coupled" to another element, it can be directly connected to the other element or intervening elements can also be present. When an element is referred to as being "positioned on" another element, it can be directly on the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only.

[0033] 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 term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] 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.

[0035] Referring to FIG. 1 and FIG. 2, the embodiment provides a cutting assembly 100 for a 3D printer 300, comprising a mounting base 10, a first cutting arm 20, a second cutting arm 30 and a push rod 40. The push rod 40 is arranged opposite to the mounting base 10, and the push rod 40 is provided with an extrusion piece 50 on the side facing the mounting base 10, and the extrusion piece 50 defines an extrusion space 53. One end of the first cutting arm 20 is rotatably connected to the mounting base 10, and the other end is arranged in the extrusion space 53. One end of the second cutting arm 30 is rotatably connected to the mounting base 10 together with the first cutting arm 20, and the other end is arranged in the extrusion space 53. The first cutting arm 20 and the second cutting arm 30 are arranged opposite to each other to define a cutting space. In the cutting space, the first cutting arm 20 and / or the second cutting arm 30 are provided with a cutting knife.

[0036] In this way, when the push rod 40 moves towards the mounting base 10 under the action of an external force, the first cutting arm 20 and the second cutting arm 30 can extend more into the extrusion space 53. During the movement of the push rod 40, the extrusion piece 50 pushes the first cutting arm 20 and the second cutting arm 30 to rotate towards each other. Under the joint force of the first cutting arm 20 and the second cutting arm 30, the cutting knife can move towards the consumable 400 in the cutting space to quickly cut off the consumable, and the cutting process is quick and effective, which is conducive to improving the material changing rate, and will not cause the straight shape of the consumable 400 to bend, so that the consumable 400 can form a good cross section at the cut-off position.

[0037] In some embodiments, the extrusion piece 50 comprises a first extrusion piece 51 and a second extrusion piece 52, and the extrusion space 53 is formed between the first extrusion piece 51 and the second extrusion piece 52. In the direction away from the mounting base 10, the width of the extrusion space 53 gradually decreases. The first extrusion piece 51 is in sliding fit with the first cutting arm 20, and the second extrusion piece 52 is in sliding fit with the second cutting arm 30. When the push rod 40 moves towards the mounting base 10 under the action of an external force, the first extrusion piece 51 and the second extrusion piece 52 push the first cutting arm 20 and the second cutting arm 30 to rotate towards each other respectively, and the extrusion space 53 with gradually decreasing width can cause the first cutting arm 20 and the second cutting arm 30 to approach each other, so as to jointly exert a shearing force on the consumable 400.

[0038] In some embodiments, the first cutting arm 20 and the second cutting arm 30 are arranged to be curved towards each other, forming a cutting space between the two curved arm structures for the consumable 400 to pass through. The cutting knives include a first cutting knife 24 and a second cutting knife 34. The first cutting knife 24 and the second cutting knife 34 are located in the cutting space and arranged on the first cutting arm 20 and the second cutting arm 30 respectively. When the first pressing member 51 and the second pressing member 52 push the first cutting arm 20 and the second cutting arm 30 to rotate towards each other, the cutting space becomes smaller, and the first cutting knife 24 and the second cutting knife 34 move closer to each other to cut the consumable 400. The first cutting knife 24 and the second cutting knife 34 are arranged opposite to each other and staggered vertically, so that when the first cutting knife 24 and the second cutting knife 34 rotate towards each other, they can at least partially overlap, facilitating the formation of shearing force on the consumable 400, quickly and efficiently cutting the consumable 400, and making the consumable 400 have a good cross section at the cutting position. In other embodiments, the first cutting knife 24 and the second cutting knife 34 can also be arranged in alignment, and the consumable 400 can be cut off by the extrusion cutting method to meet the cutting requirements, which is not limited in the present application. The first pressing member 51 and the second pressing member 52 form a U-shaped structure, and the extrusion space 53 is a semicircular groove structure between the first pressing member 51 and the second pressing member 52. During the movement of the push rod 40 towards the mounting seat 10, the more part of the first cutting arm 20 and the second cutting arm 30 enters the extrusion space 53, the greater the rotating stroke of the two cutting arms pushed by the two pressing members, and thus the first cutting knife 24 and the second cutting knife 34 can fully cut the consumable 400.

[0039] Please continue to refer to FIG. 3, FIG. 4 and FIG. 5. In some embodiments, the first pressing member 51 is provided with a first pulley 54 at the end away from the push rod 40, and the first pulley 54 is in sliding cooperation with the outer side surface of the first cutting arm 20. During the movement of the push rod 40 towards the mounting seat 10, the first pressing member 51 pushes the first cutting arm 20 to rotate towards the second cutting arm 30 through the first pulley 54. In some embodiments, the second pressing member 52 is provided with a second pulley 55 at the end away from the push rod 40, and the second pulley 55 is in sliding cooperation with the outer side surface of the second cutting arm 30. During the movement of the push rod 40 towards the mounting seat 10, the second pressing member 52 pushes the second cutting arm 30 to rotate towards the first cutting arm 20 through the second pulley 55. The first pulley 54 and the second pulley 55 can be bearing rollers, which can reduce the frictional resistance between the pressing members and the cutting arms. On the one hand, it can make the pressing members quickly push the cutting arms, improve the cutting speed, and on the other hand, it can also reduce the friction loss of the structure, prolong the service life of the cutting assembly 100.

[0040] In some embodiments, referring to Figs. 1-4 again, the first cutting arm 20 comprises a first portion 21, a second portion 22 and a third portion 23 connected in sequence, the first portion 21 is rotatably connected to the mounting base 10, a first cutting blade 24 is arranged on a side of the second portion 22 facing the second cutting arm 30, the third portion 23 is bent towards the second cutting arm 30, and an end of the third portion 23 is accommodated in the pressing space 53 and is in sliding fit with the first pressing member 51. The second cutting arm 30 comprises a fourth portion 31, a fifth portion 32 and a sixth portion 33 connected in sequence, the fourth portion 31 is rotatably connected to the mounting base 10, and the fourth portion 31 is arranged in stack with the first portion 21, a second cutting blade 34 is arranged on a side of the fifth portion 32 facing the second portion 22, the sixth portion 33 is bent towards the first cutting arm 20, and the sixth portion 33 is accommodated in the pressing space 53 and is in sliding fit with the first pressing member 51.

[0041] Specifically, the mounting base 10 is provided with a rotating pin 11, and the first portion 21 of the first cutting arm 20 and the fourth portion 31 of the second cutting arm 30 are rotatably sleeved on the rotating pin 11, so that the first cutting arm 20 and the second cutting arm 30 are hinged on the mounting base 10. The first portion 21 and the second portion 22 connected in sequence are bent towards a direction away from the second cutting arm 30, and the fourth portion 31 and the fifth portion 32 connected in sequence are bent towards a direction away from the first cutting arm 20, so as to form a cutting space between the first cutting arm 20 and the second cutting arm 30.

[0042] In some embodiments, the thickness of the first portion 21 is less than the thickness of the second portion 22, the thickness of the fourth portion 31 is less than the thickness of the fifth portion 32, and the first portion 21 and the fourth portion 31 are arranged in staggered manner. Specifically, the first portion 21 is connected to the bottom of the second portion 22, and the fourth portion 31 is connected to the upper portion of the fifth portion 32, so that the first portion 21 is below the fourth portion 31. In this way, after the first portion 21 and the fourth portion 31 are arranged in stack on the rotating pin 11, the second portion 22 and the fifth portion 32 are substantially at the same height position, without excessive deviation.

[0043] In some embodiments, the third portion 23 and the sixth portion 33 are arranged in staggered manner. Specifically, the third portion 23 is connected to the upper portion of the second portion 22, and the sixth portion 33 is connected to the lower portion of the fifth portion 32, so that the third portion 23 is above the sixth portion 33. When the first cutting arm 20 and the second cutting arm 30 are rotated towards each other, the third portion 23 and the sixth portion 33 can be arranged in staggered manner, so that the first cutting blade 24 and the second cutting blade 34 can overlap as much as possible, which is beneficial to increase the shearing range.

[0044] Further, the height positions of the first pulley 54 and the second pulley 55 are also matched with the third portion 23 and the sixth portion 33 respectively, so as to smoothly push the first cutting arm 20 and the second cutting arm 30 to rotate towards each other to implement the cutting process.

[0045] In some embodiments, the push rod 40 comprises a main body portion 41, a rotating portion 42 and a pushing portion 43. The rotating portion 42 is arranged at one end of the main body portion 41 and is used to rotatably connect the main body portion 41 to an external structure. The pushing portion 43 is arranged at the other end of the main body portion 41 and is used to apply an external force to the main body portion 41. The pressing member 50 is connected to the side of the main body portion 41 facing the mounting base 10, and the distance between the pressing member 50 and the rotating portion 42 is less than the distance between the pressing member 50 and the pushing portion 43. In this way, the push rod 40 forms a force-saving lever structure. A small external force applied to the pushing portion 43 can easily drive the two cutting arms to move towards each other, thereby quickly and efficiently cutting the consumable 400.

[0046] Specifically, the center position of the rotating portion 42 is arranged at the rotating shaft 44, and the push rod 40 as a whole can rotate around the rotating shaft 44. The main body portion 41 comprises a first rod portion 411 and a second rod portion 412 connected to each other, and the extension direction of the first rod portion 411 is arranged to intersect the extension direction of the second rod portion 412. That is, the included angle between the first rod portion 411 and the second rod portion 412 is less than 180°. The pushing portion 43 is arranged at the end of the first rod portion 411, and the rotating portion 42 is arranged at the end of the second rod portion 412. The length of the first rod portion 411 is greater than the length of the second rod portion 412. The first pressing member 51 and the second pressing member 52 are connected to the side of the first rod portion 411 facing the mounting base 10.

[0047] In one of the embodiments, the thickness of the first pulley 54 is greater than the thickness of the third portion 23, and the thickness of the second pulley 55 is greater than the thickness of the sixth portion 33. As shown in FIG. 4 and FIG. 7, when the push rod 40 rotates towards the mounting base 10 under the action of the external force, the first pressing member 51 and the second pressing member 52 also synchronously press the first cutting arm 20 and the second cutting arm 30, and the first cutting arm 20 and the second cutting arm 30 move towards each other. The first pulley 54 and the second pulley 55 with greater thickness can maintain contact with the third portion 23 and the sixth portion 33 when the first pressing member 51 and the second pressing member 52 are inclined, so that the two cutting arms can continuously receive the pushing force from the two pressing members.

[0048] In some embodiments, referring again to FIG. 1 to FIG. 5, the cutting assembly 100 further comprises a reset member 60 which is elastically abutted between the first cutting arm 20 and the second cutting arm 30. When the external force applied to the push rod 40 disappears, the first cutting arm 20 and the second cutting arm 30 can reversely rotate under the action of the elastic force of the reset member 60, and simultaneously reversely push the first pressing member 51 and the second pressing member 52, so as to make the push rod 40 return to the initial position.

[0049] In some embodiments, as shown in FIG. 5, the reset member 60 can be a spring structure, the first cutting arm 20 is provided with a first positioning member 25, which is located at one end of the second part 22 close to the third part 23. The second cutting arm 30 is provided with a second positioning member 35, which is located at one end of the fifth part 32 close to the sixth part 33. The first positioning member 25 and the second positioning member 35 are oppositely arranged, and the two ends of the reset member 60 are respectively sleeved on the first positioning member 25 and the second positioning member 35. In this way, when the push rod 40 rotates towards the mounting base 10 to drive the first cutting arm 20 and the second cutting arm 30 to approach each other, the reset member 60 is compressed. When the external force on the push rod 40 disappears, the reset member 60 releases the elastic force and pushes the first cutting arm 20 and the second cutting arm 30 away from each other, thereby exerting a counteracting force on the push rod 40 to reset the push rod 40.

[0050] In other embodiments, the reset member 60 can also be arranged at the rotating connection between the first cutting arm 20, the second cutting arm 30 and the mounting base 10, for driving the first cutting arm 20 and the second cutting arm 30 to rotate in opposite directions. Specifically, the reset member 60 can be a torsion spring arranged at the rotating pin 11. When the first cutting arm 20 and the second cutting arm 30 approach each other, the torsion spring is compressed. After the external force on the push rod 40 disappears, the torsion spring releases the elastic force on the first cutting arm 20 and the second cutting arm 30 respectively, so that the first cutting arm 20 and the second cutting arm 30 rotate in opposite directions and reset, while the push rod 40 is also reset.

[0051] In some embodiments, referring again to FIGS. 1, 3 and 4, the mounting base 10 is further provided with a limiting member 12, which is located on the side of the first cutting arm 20 away from the second cutting arm 30, for resisting the first cutting arm 20. When the reset member 60 pushes the first cutting arm 20 and the second cutting arm 30 away from each other, the limiting member 12 can limit the rotation range of the first cutting arm 20 by abutting against the outer side of the first cutting arm 20, so as to avoid the first cutting arm 20 moving out of the extrusion space 53, thereby limiting the rotation range of the second cutting arm 30 and preventing the reset member 60 from falling off.

[0052] Referring to FIG. 6 and FIG. 7, the embodiment of the present application further provides an extrusion mechanism 200 for the 3D printer 300, comprising the extrusion assembly 201 and the cutting assembly 100 for the 3D printer 300 as described in the above embodiment, the extrusion assembly 201 is connected to the mounting seat 10 of the cutting assembly 100, and the discharge end 202 of the extrusion assembly 201 is correspondingly arranged with the cutting knives of the cutting assembly 100. Specifically, the mounting seat 10 comprises the first mounting plate 13 and the second mounting plate 14 which are connected vertically. The rotating pin 11 is arranged on the first mounting plate 13 and is rotatably connected with the first cutting arm 20 and the second cutting arm 30. One side of the extrusion assembly 201 can be positioned with the second mounting plate 14, so that the extrusion assembly 201 is located above the first cutting arm 20 and the second cutting arm 30. The consumable 400 is inserted from the upper end of the extrusion assembly 201 and enters between the first cutting knife 24 and the second cutting knife 34 from the discharge port at the lower end of the extrusion assembly 201. When the push rod 40 is pushed towards the mounting seat 10 by the external device or the user, the push rod 40 pushes the first cutting arm 20 and the second cutting arm 30 to approach each other through the first extrusion piece 51, the second extrusion piece 52, the first pulley 54 and the second pulley 55, so that the first cutting knife 24 and the second cutting knife 34 cut the consumable 400 at the same time, realizing efficient cutting of the consumable 400 and facilitating the replacement operation of the extrusion assembly 201.

[0053] Referring to FIG. 8, the embodiment of the present application further provides a 3D printer 300, comprising the frame 301, the printing platform 302 and the cutting assembly 100 for the 3D printer 300 as described in the above embodiment or the extrusion mechanism 200 for the 3D printer 300 as described in the above embodiment. The printing platform 302 is movably assembled in the frame 301, and the cutting assembly 100 or the extrusion mechanism 200 is movably assembled in the frame 301 and is correspondingly arranged with the printing platform 302.

[0054] The above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. 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 cutting assembly for a 3D printer, characterized in that: include: Mounting seat; A push rod is arranged opposite to the mounting seat, and an extrusion piece is provided on a side of the push rod facing the mounting seat, wherein the extrusion piece defines an extrusion space; a first cutting arm, one end of which is rotatably connected to the mounting seat and the other end of which is disposed in the extrusion space; a second cutting arm, one end of which is rotatably connected to the mounting seat together with the first cutting arm, and the other end of which is disposed in the extrusion space; The first cutting arm and the second cutting arm are arranged opposite to each other to define a cutting space, and a cutting knife is provided on the first cutting arm and / or the second cutting arm in the cutting space.

2. The cutting assembly for a 3D printer according to claim 1, characterized in that: The extrusion piece includes a first extrusion piece and a second extrusion piece, and the extrusion space is formed between the first extrusion piece and the second extrusion piece; A first pulley is provided at one end of the first extrusion member away from the push rod, and the first pulley is slidably engaged with the outer side surface of the first cutting arm.

3. The cutting assembly for a 3D printer according to claim 1, characterized in that: The extrusion piece includes a first extrusion piece and a second extrusion piece, and the extrusion space is formed between the first extrusion piece and the second extrusion piece; A second pulley is provided at one end of the second extrusion member away from the push rod, and the second pulley is slidably engaged with the outer side surface of the second cutting arm.

4. The cutting assembly for a 3D printer according to claim 1, characterized in that: The extrusion piece includes a first extrusion piece and a second extrusion piece, and the extrusion space is formed between the first extrusion piece and the second extrusion piece; A first pulley is provided at one end of the first extrusion member away from the push rod, and the first pulley is slidably engaged with the outer side surface of the first cutting arm; and A second pulley is provided at one end of the second extrusion member away from the push rod, and the second pulley is slidably engaged with the outer side surface of the second cutting arm.

5. The cutting assembly for a 3D printer according to any one of claims 2 to 4, characterized in that: The first cutting arm includes a first part, a second part and a third part that are connected to each other. The first part is rotatably connected to the mounting seat. The cutter includes a first cutter. The first cutter is arranged on the side of the second part facing the second cutting arm. The third part is bent toward the second cutting arm. The end of the third part is accommodated in the extrusion space and slidingly cooperates with the first extrusion member.

6. The cutting assembly for a 3D printer according to claim 5, characterized in that: The second cutting arm includes a fourth part, a fifth part and a sixth part that are connected to each other. The fourth part is rotatably connected to the mounting seat, and the fourth part is stacked with the first part. The cutter includes a second cutter. The second cutter is arranged on the side of the fifth part facing the second part. The sixth part is bent toward the first cutting arm. The sixth part is accommodated in the extrusion space and slides with the first extrusion member.

7. The cutting assembly for a 3D printer according to any one of claims 1 to 6, characterized in that: The width of the extrusion space gradually decreases in a direction away from the mounting seat.

8. The cutting assembly for a 3D printer according to any one of claims 1 to 7, characterized in that: The push rod includes a main body, a rotating part and a pushing part. The rotating part is provided at one end of the main body for rotating the main body to connect to an external structure. The pushing part is provided at the other end of the main body for applying an external force to the main body. The extrusion member is connected to a side of the main body facing the mounting seat, and the distance between the extrusion member and the rotating part is smaller than the distance between the extrusion member and the pushing part.

9. The cutting assembly for a 3D printer according to any one of claims 1 to 8, characterized in that: The cutting assembly further includes a reset member, which is elastically supported between the first cutting arm and the second cutting arm.

10. The cutting assembly for a 3D printer according to claim 9, characterized in that: The reset member is provided at the rotation connection between the first cutting arm, the second cutting arm and the mounting seat, and is used for driving the first cutting arm and the second cutting arm to rotate in opposite directions.

11. The cutting assembly for a 3D printer according to claim 9 or 10, characterized in that: The first cutting arm is provided with a first positioning member, the second cutting arm is provided with a second positioning member, the first positioning member and the second positioning member are arranged opposite to each other, and the two ends of the reset member are respectively sleeved on the first positioning member and the second positioning member.

12. The cutting assembly for a 3D printer according to any one of claims 1 to 11, characterized in that: The mounting seat is further provided with a limiting member, which is located on a side of the first cutting arm away from the second cutting arm and is used to resist the first cutting arm.

13. An extrusion mechanism for a 3D printer, characterized in that: The invention comprises an extrusion component and a cutting component for a 3D printer, wherein the extrusion component is connected to a mounting seat of the cutting component, and a discharge end of the extrusion component is arranged corresponding to a cutter of the cutting component.

14. The extrusion mechanism for a 3D printer according to claim 13, characterized in that: The cutting component for the 3D printer includes: Mounting seat; A push rod is arranged opposite to the mounting seat, and an extrusion piece is provided on a side of the push rod facing the mounting seat, wherein the extrusion piece defines an extrusion space; a first cutting arm, one end of which is rotatably connected to the mounting seat and the other end of which is disposed in the extrusion space; a second cutting arm, one end of which is rotatably connected to the mounting seat together with the first cutting arm, and the other end of which is disposed in the extrusion space; The first cutting arm and the second cutting arm are arranged opposite to each other to define a cutting space, and a cutting knife is provided on the first cutting arm and / or the second cutting arm in the cutting space.

15. The extrusion mechanism for a 3D printer according to claim 14, characterized in that: The extrusion piece includes a first extrusion piece and a second extrusion piece, and the extrusion space is formed between the first extrusion piece and the second extrusion piece; A first pulley is provided at one end of the first extrusion member away from the push rod, and the first pulley is slidably engaged with the outer side surface of the first cutting arm.

16. The extrusion mechanism for a 3D printer according to claim 14, characterized in that: The extrusion piece includes a first extrusion piece and a second extrusion piece, and the extrusion space is formed between the first extrusion piece and the second extrusion piece; A second pulley is provided at one end of the second extrusion member away from the push rod, and the second pulley is slidably engaged with the outer side surface of the second cutting arm.

17. The extrusion mechanism for a 3D printer according to claim 14, wherein: The extrusion piece includes a first extrusion piece and a second extrusion piece, and the extrusion space is formed between the first extrusion piece and the second extrusion piece; A first pulley is provided at one end of the first extrusion member away from the push rod, and the first pulley is slidably engaged with the outer side surface of the first cutting arm; and A second pulley is provided at one end of the second extrusion member away from the push rod, and the second pulley is slidably engaged with the outer side surface of the second cutting arm.

18. The extrusion mechanism for a 3D printer according to any one of claims 15 to 17, characterized in that: The first cutting arm includes a first part, a second part and a third part that are connected to each other. The first part is rotatably connected to the mounting seat. The cutter includes a first cutter. The first cutter is arranged on the side of the second part facing the second cutting arm. The third part is bent toward the second cutting arm. The end of the third part is accommodated in the extrusion space and slidingly cooperates with the first extrusion member.

19. The extrusion mechanism for a 3D printer according to claim 18, wherein: The second cutting arm includes a fourth part, a fifth part and a sixth part that are connected to each other. The fourth part is rotatably connected to the mounting seat, and the fourth part is stacked with the first part. The cutter includes a second cutter. The second cutter is arranged on the side of the fifth part facing the second part. The sixth part is bent toward the first cutting arm. The sixth part is accommodated in the extrusion space and slides with the first extrusion member.

20. A 3D printer, characterized in that: include: frame; a printing platform, movably mounted on the frame; and The cutting assembly for a 3D printer according to any one of claims 1 to 12 or the extrusion mechanism for a 3D printer according to any one of claims 13 to 19, wherein the cutting assembly or the extrusion mechanism is movably mounted on the frame and arranged corresponding to the printing platform.

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