Cleaning assembly, hot bed device and 3D printer

Abstract

The utility model relates to the technical field of 3D printing, aims to solve the technical problem that some existing cleaning structures are poor in nozzle cleaning effect, and provides a cleaning assembly, a hot bed device and a 3D printer. Wherein the cleaning assembly comprises a plurality of bristle sets, the bristle sets are distributed in the first direction, each bristle set comprises a plurality of bristle parts distributed in the second direction, the bristle parts of every two adjacent bristle sets are staggered in the first direction, and the first direction and the second direction are kept orthogonal. The nozzle cleaning device has the beneficial effect that the cleaning effect on the nozzle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, in particular, relates to a cleaning assembly, a hot bed device and a 3D printer. BACKGROUND

[0002] After the nozzle completes the printing action, the residual material on the surface of the nozzle is generally cleaned by relative movement with the cleaning structure. However, some existing cleaning structures have poor cleaning effect on the residual material. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a cleaning assembly, a hot bed device and a 3D printer to solve the technical problem that some existing cleaning structures have poor cleaning effect on the residual material.

[0004] The present application provides a cleaning assembly, comprising a plurality of brush groups, the plurality of brush groups are distributed along a first direction, each of the brush groups comprises a plurality of brush portions distributed along a second direction, wherein the brush portions of two adjacent brush groups are staggered along the first direction, and the first direction is orthogonal to the second direction.

[0005] According to the cleaning assembly of the present application, after the nozzle contacts the plurality of brush groups, the brush portions arranged in a staggered manner can contact the surface of the nozzle in different directions, thereby wiping the surface of the nozzle from different directions, improving the wiping efficiency of the surface of the nozzle, and compared with the brush groups arranged in a regular manner in the known technology, the cleaning strength can be further enhanced and the cleaning quality can be improved.

[0006] In one possible implementation, the cleaning assembly further comprises a base portion, and the plurality of brush groups are arranged on one side of the base portion along a third direction, wherein the third direction is orthogonal to the first direction and orthogonal to the second direction. The brush portion has a first inclined surface and a second inclined surface, the first inclined surface is arranged on one side of the second inclined surface along the first direction, and in the direction away from the base portion, the distance between the first inclined surface and the second inclined surface along the first direction gradually decreases.

[0007] In one possible implementation,

[0008] The brush portion further comprises a first top surface and a second top surface, the first top surface is connected to the first inclined surface and extends in a direction close to the second inclined surface, the second top surface is connected to the second inclined surface and extends in a direction close to the first inclined surface, the first top surface is any one of a plane, a concave surface or a convex surface, and the second top surface is any one of a plane, a concave surface or a convex surface.

[0009] In one possible implementation,

[0010] An angle range formed between the first inclined surface and the second inclined surface is between 90 degrees and 135 degrees.

[0011] In a possible implementation manner,

[0012] The bristle part comprises a first brush part and / or a second brush part, and a first gap is formed between the first brush part and the second brush part, and a second gap is formed between two adjacent groups of the bristle groups.

[0013] In a possible implementation manner,

[0014] The cleaning assembly is applied to a 3D printer having a nozzle, and the sealing part is located on one side of the plurality of groups of the bristle groups, and the sealing surface is configured to seal an extrusion port of the nozzle.

[0015] In a possible implementation manner,

[0016] The sealing surface is a plane, and a height of the sealing surface in a third direction is lower than a height of a top surface of the bristle part in the third direction, or the height of the sealing surface in the third direction is consistent with the height of the top surface of the bristle part in the third direction.

[0017] In a possible implementation manner,

[0018] The cleaning assembly further comprises a base part having a mounting surface, and the plurality of groups of the bristle groups are arranged on the mounting surface, and the sealing part is arranged on the mounting surface, and the sealing surface is spaced apart from the mounting surface, and the sealing part further comprises a connecting surface, and the connecting surface is arranged to be inclined relative to the mounting surface, and the connecting surface is connected between the mounting surface and the sealing surface.

[0019] The application further provides a hot bed device comprising a build plate and the aforementioned cleaning assembly. The build plate is configured to carry a printing model. The cleaning assembly is arranged at an edge portion of the build plate.

[0020] The application further provides a 3D printer comprising a nozzle, the aforementioned cleaning assembly, and / or the aforementioned hot bed device, and the cleaning assembly is configured to clean the nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings in the embodiments will be briefly introduced as follows. 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.

[0022] Figure 1 Structure diagram of a 3D printer according to an embodiment of the present application.

[0023] Figure 2 Structure diagram of a hot bed device according to an embodiment of the present application.

[0024] Figure 3 Structure diagram of a cleaning assembly according to an embodiment of the present application.

[0025] Figure 4 Structure diagram of a bristle group according to an embodiment of the present application.

[0026] Figure 5 Structure diagram of a first brush part and a second brush part according to an embodiment of the present application.

[0027] Figure 6 Structure diagram of a cleaning assembly according to another embodiment of the present application.

[0028] Figure 7 Structure diagram of a cleaning assembly according to another embodiment of the present application.

[0029] Figure 8 Structure diagram of a hot bed device according to another embodiment of the present application.

[0030] Figure 9 Structure diagram of a cleaning assembly according to another embodiment of the present application.

[0031] Figure 10 Structure diagram of a cleaning assembly and a print head according to an embodiment of the present application.

[0032] Figure 11 Structure diagram of a cleaning assembly and a print head according to another embodiment of the present application.

[0033] Figure 12 Structure diagram of a cleaning assembly according to another embodiment of the present application.

[0034] Explanation of main element symbols:

[0035] Cleaning assembly 100

[0036] Bristle group 10

[0037] Bristle part 20

[0038] First brush part 21

[0039] Second brush part 22

[0040] Base part 30

[0041] Sealing part 40

[0042] First elastic member 51

[0043] Second elastic member 52

[0044] First inclined surface P1

[0045] Second inclined surface P2

[0046] First top surface P3

[0047] Second top surface P4

[0048] Closed surface P5

[0049] Connecting surface P6

[0050] Mounting surface P7

[0051] First gap Q1

[0052] Second gap Q2

[0053] Third gap Q3

[0054] Extrusion port K

[0055] Hot bed device 200

[0056] Build plate 201

[0057] Hot bed plate 202

[0058] 3D printer 300

[0059] Rack 301

[0060] Base 302

[0061] X-axis drive assembly 303

[0062] Y-axis drive assembly 304

[0063] Z-axis drive assembly 305

[0064] Print head 306

[0065] Nozzle 307

[0066] First direction M1

[0067] Second direction M2

[0068] Third direction M3

[0069] The following detailed description will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to 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 of the embodiments of the present application.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] Referring to Figure 1 The present application provides a 3D printer 300, for example, a 3D printer 300 based on FDM technology.

[0075] The 3D printer 300 includes a base 302, a frame 301, a print head 306, a hot bed device 200, an X-axis drive assembly 303, a Y-axis drive assembly 304, or a Z-axis drive assembly 305.

[0076] The frame 301 is fixedly connected to the base 302. The Z-axis drive assembly 305 is connected to the frame 301. The X-axis drive assembly 303 is connected to the Z-axis drive assembly 305. The print head 306 is connected to the X-axis drive assembly 303. The Y-axis drive assembly 304 is connected to the base 302. The Y-axis drive assembly 304 is drivingly connected to the hot bed device 200. The hot bed device 200 is connected to the side of the Y-axis drive assembly 304 away from the base 302.

[0077] In this way, the relative displacement between the print head 306 and the hot bed device 200 can occur in the X direction, the Y direction, and the Z direction, so that the print head 306 can extrude the consumables on the hot bed device 200 and print a three-dimensional printed part.

[0078] In other embodiments, the movable direction of the hot bed device 200 and the print head 306 can also take other forms, which are not limited herein. For example, the Z-axis driving assembly 305 can be arranged on the base 302 and connected with the hot bed device 200. The print head 306 is connected to the frame 301 through the bidirectional driving structure of the first direction M1 and the second direction M2 composed of the X-axis driving assembly 303 and the Y-axis driving assembly 304.

[0079] In some embodiments, referring to Figure 1 and Figure 2 , the hot bed device 200 includes a build plate 201 and a cleaning assembly 100. The build plate 201 is configured to carry a printed model. The cleaning assembly 100 is configured to clean the nozzles 307. The cleaning assembly 100 is arranged at the edge of the build plate 201. After the printing action is completed, the relative movement between the print head 306 and the hot bed device 200 causes the relative movement between the nozzles 307 and the cleaning assembly 100, so that the surface of the nozzles 307 can be cleaned when the material on the surface of the nozzles 307 has not yet solidified, thereby further improving the cleaning efficiency of the surface of the nozzles 307. In other embodiments, the hot bed device 200 further includes a hot bed plate 202 and other elements.

[0080] In other embodiments, the cleaning assembly 100 can also be independent of the hot bed device 200 and arranged on the frame 301. In this way, after the printing action is completed, the print head 306 is driven by the X-axis driving assembly 303 and the Z-axis driving assembly 305 to move relative to the cleaning assembly 100, thereby achieving the surface cleaning of the nozzles 307 of the print head 306. Therefore, the installation position of the cleaning assembly 100 of the present embodiment can be adjusted according to actual needs, which is not limited herein.

[0081] Referring to Figure 3 , the cleaning assembly 100 includes a plurality of brush groups 10, which are distributed along the first direction M1. Each brush group 10 includes a plurality of brush portions 20 distributed along the second direction M2. The brush portions 20 of adjacent two brush groups 10 are staggered along the first direction M1. The first direction M1 and the second direction M2 are orthogonal.

[0082] According to the cleaning assembly 100 of the present application, after the nozzles 307 contact the plurality of brush groups 10, the staggered brush portions 20 can contact the surface of the nozzles 307 in different directions, thereby wiping the surface of the nozzles 307 from different directions, improving the wiping efficiency of the surface of the nozzles 307. Compared with the regularly arranged brush groups in the known technology, the cleaning strength can be further enhanced and the cleaning quality can be improved.

[0083] The brush portions 20 of the two adjacent groups of brush sets 10 are staggered along the first direction M1, which means that one group of brush sets 10 is offset from the other group of brush sets 10 along the first direction M1 and the second direction M2, and the projections of the two groups of brush sets 10 along the first direction M1 do not coincide. For example, any brush portion 20 of one group of brush sets 10 corresponds to a portion of a brush portion 20 of the other group of brush sets 10 or a gap between two adjacent brush portions 20 of the other group of brush sets 10 along the first direction M1, which can achieve the stagger of the brush portions 20 of the two adjacent groups of brush sets 10 along the first direction M1.

[0084] In some embodiments, referring to Figure 3 The cleaning assembly 100 further includes a base portion 30. The groups of brush sets 10 are arranged on one side of the base portion 30 along a third direction M3. The base portion 30 is used to be connected to the hot bed plate 202 or the rack 301. The brush portion 20 has a first inclined surface P1 and a second inclined surface P2, the first inclined surface P1 is arranged on one side of the second inclined surface P2 along the first direction M1, and the distance between the first inclined surface P1 and the second inclined surface P2 along the first direction M1 gradually decreases in the direction away from the base portion 30.

[0085] In this way, during the reciprocating movement of the nozzle 307 relative to the cleaning assembly 100 in different directions, the first inclined surface P1 and the second inclined surface P2 can respectively clean the surfaces on both sides of the nozzle 307.

[0086] In the present embodiment, the third direction M3 is orthogonal to the first direction M1, and the third direction M3 is orthogonal to the second direction M2. For example, the third direction M3 can be formed as a vertical direction, and the first direction M1 and the second direction M2 are formed as two directions perpendicular to each other in a horizontal plane.

[0087] In some embodiments, the angle range formed between the first inclined surface P1 and the second inclined surface P2 is between 90 degrees and 135 degrees. For example, the angle can be any one of 90 degrees, 95 degrees, 100 degrees, 105 degrees, 110 degrees, 115 degrees, 120 degrees, 125 degrees, 130 degrees, and 135 degrees. If the angle is less than 90 degrees, the brush portion 20 is formed as an outwardly expanding structure away from the base portion 30, and the cleaning effect on the nozzle 307 is poor. If the angle is greater than 135 degrees, the brush portion 20 is relatively flat and cannot achieve good cleaning effect. By setting the angle between 90 degrees and 135 degrees, the cleaning effect on the nozzle 307 can be further improved.

[0088] In some embodiments, referring to Figure 3The base part 30 has a mounting surface P7, and a plurality of groups of bristle groups 10 are arranged on the mounting surface P7. The base part 30 is configured to be fixedly mounted on the 3D printer 300, for example, the frame 301 or the build plate 201 of the 3D printer 300.

[0089] In some embodiments, referring to Figure 3 The bristle part 20 further comprises a first top surface P3 and a second top surface P4, the first top surface P3 is connected to the first inclined surface P1 and extends in a direction close to the second inclined surface P2, and the second top surface P4 is connected to the second inclined surface P2 and extends in a direction close to the first inclined surface P1, and the first top surface P3 is any one of a plane, a concave surface or a convex surface. The second top surface P4 is any one of a plane, a concave surface or a convex surface.

[0090] In this way, after the nozzle 307 moves along the first inclined surface P1 or the second inclined surface P2 to the first top surface P3 or the second top surface P4, the first top surface P3 or the second top surface P4 can clean the bottom surface of the nozzle 307, thereby improving the overall cleaning effect of the cleaning assembly 100 on the nozzle 307.

[0091] In some embodiments, referring to Figure 3 The bristle part 20 comprises a first brush part 21 and / or a second brush part 22, and the first brush part 21 and the second brush part 22 have a first gap Q1 therebetween, and the bristle parts 20 of the two adjacent groups of bristle groups 10 have a second gap Q2 therebetween. The first gap Q1 is configured to cause the first brush part 21 and / or the second brush part 22 to deform after being in contact with the nozzle 307. In this way, during the relative movement of the nozzle 307 with respect to the cleaning assembly 100, the first brush part 21 and the second brush part 22 can clean the nozzle 307 without damaging the surface of the nozzle 307. Moreover, the second gap Q2 can cause the bristle parts 20 of the two adjacent groups of bristle groups 10 to deform with respect to each other after being in contact with the nozzle 307. In this way, during the relative movement of the nozzle 307 with respect to the bristle groups 10, the second gap Q2 can further improve the deformation amount of each bristle part 20, thereby increasing the contact area between the bristle groups 10 and the surface of the nozzle 307 and improving the cleaning effect.

[0092] In this embodiment, the top surface of the first brush part 21 is formed as the first top surface P3, and the side surface of the first brush part 21 away from the second brush part 22 in the second direction M2 is formed as the first inclined surface P1. The top surface of the second brush part 22 is formed as the second top surface P4, and the side surface of the second brush part 22 away from the first brush part 21 in the second direction M2 is formed as the second inclined surface P2.

[0093] In this embodiment, referring to Figure 3The bristle part 20 of one of the groups of bristle sets 10 comprises both the first bristle part 21 and the second bristle part 22, the bristle part 20 of one end of the two ends of the other group of bristle sets 10 comprises only the first bristle part 21, and the bristle part 20 of the other end comprises only the second bristle part 22, so as to stagger the groups of bristle sets 10.

[0094] In some embodiments, the first gap Q1 is formed from the top surface of the bristle part 20 and extends to the mounting surface P7. In other embodiments, referring to Figure 4 , the first gap Q1 has a gap bottom surface, and the gap bottom surface is spaced apart from the mounting surface P7. Therefore, the depth of the first gap Q1 can be adjusted according to the requirement of the deformation amount of the bristle part 20, which is not specifically limited in the present embodiment.

[0095] In some embodiments, referring to Figure 5 , each first bristle part 21 is provided with a second bristle part 22 on each side along the first direction M1. In this way, the projection of the first inclined surface P1 of the first bristle part 21 along the first direction M1 intersects with the projection of the second inclined surface P2 of the second bristle part 22 along the first direction M1.

[0096] In this embodiment, along the first direction M1, the first bristle part 21 and the second bristle part 22 can completely correspond to each other, or can be offset at a certain distance in the second direction M2.

[0097] In some embodiments, referring to Figure 3 , in each group of bristle sets 10, the two adjacent bristle parts 20 have a third gap Q3, so that the two adjacent bristle parts 20 are configured to deform with respect to the nozzle 307. In this way, during the relative movement between the nozzle 307 and the bristle set 10, the third gap Q3 can further improve the deformation amount of each bristle part 20, thereby improving the contact area between the bristle set 10 and the surface of the nozzle 307, and improving the cleaning effect.

[0098] In some embodiments, referring to Figure 6 , the bristle part 20 is formed as an integral structure, the first top surface P3 and the second top surface P4 are connected and form the surface of the bristle part 20 away from the base part 30 along the third direction M3, and the first inclined surface P1 and the second inclined surface P2 are the surfaces on the two opposite sides of the bristle part 20 along the second direction M2.

[0099] In the embodiment shown in Figure 6 , the first inclined surface P1 and the second inclined surface P2 are connected to the mounting surface P7 by a vertical surface respectively. And the first inclined surface P1 and the second inclined surface P2 are both planar.

[0100] In the embodiment shown in Figure 7In the shown embodiment, the first inclined surface P1 and the second inclined surface P2 are both arc surfaces, and the first top surface P3 and the second top surface P4 are also arc surfaces, and the first inclined surface P1, the first top surface P3, the second top surface P4 and the second inclined surface P2 are smoothly and sequentially connected.

[0101] In some embodiments, referring to Figure 8 and Figure 9 , the cleaning assembly 100 further comprises a first elastic member 51. The first elastic member 51 is elastically supported between the base 30 and the 3D printer 300 on a side of the base 30 facing away from the bristle group 10. The first elastic member 51 can be configured as an elastic element such as a spring, a tension spring or an elastic column.

[0102] In this way, the first elastic member 51 can enable the bristle group 10 to move closer to or further away from the 3D printer 300. When the nozzle 307 is in contact with the bristle group 10, the first elastic member 51 exerts an elastic force on the bristle group 10 to enable the bristle group 10 to be pressed against the surface of the nozzle 307, thereby improving the cleaning effect of the bristle group 10 on the surface of the nozzle 307. In addition, the first elastic member 51 can also provide a certain buffering effect to avoid the possibility of interference and damage between the nozzle and the bristle group 10, and enable the bristle group 10 to better adapt to the movement of the nozzle, simplify the movement control logic of the nozzle, and further reduce the assembly precision requirement of the cleaning assembly 100, thereby improving the application range of the cleaning assembly 100.

[0103] In some embodiments, referring to Figure 8 , the first elastic member 51 is connected between the base 30 and the edge portion of the build plate 201. In other embodiments, the cleaning assembly 100 is mounted on the gantry 301, and the first elastic member 51 is connected between the gantry 301 and the base 30.

[0104] In some embodiments, referring to Figure 10 and Figure 11 , the cleaning assembly 100 further comprises a hole sealing portion 40. The hole sealing portion 40 is located on one side of the plurality of bristle groups 10, and has a sealing surface P5 configured to seal the extrusion opening K of the nozzle 307. In this way, after the nozzle 307 moves relative to the plurality of bristle groups 10 and finishes cleaning the excess material on the surface of the nozzle 307, the X-axis drive assembly 303 and the Z-axis drive assembly 305 can drive the nozzle 307 to move to abut against the sealing surface P5, so that the sealing surface P5 seals the extrusion opening K of the nozzle 307.

[0105] In some embodiments, the closed surface P5 is a plane, and the height of the closed surface P5 in the third direction M3 is lower than the height of the top surface (e.g., the first top surface P3 or the second top surface P4) of the bristle portion 20 in the third direction M3, or the height of the closed surface P5 in the third direction M3 is consistent with the height of the top surface (e.g., the first top surface P3 or the second top surface P4) of the bristle portion 20 in the third direction M3. In this way, when the nozzle 307 moves onto the closed surface P5, the closed surface P5 can ensure good sealing effect on the extrusion opening K of the nozzle 307, and reduce the possibility of forming a gap between the extrusion opening K and the closed surface P5.

[0106] In some embodiments, referring to Figure 10 , the hole sealing portion 40 is arranged on the mounting surface P7, and the closed surface P5 is spaced apart from the mounting surface P7. The hole sealing portion 40 further includes a connecting surface P6 connected between the mounting surface P7 and the closed surface P5. The connecting surface P6 is configured to guide the nozzle 307 to move from the position of the bristle group 10 to the closed surface P5, so as to avoid the nozzle 307 being limited by the hole sealing portion 40 during movement and unable to enter the space above the closed surface P5, and enable the nozzle 307 to be abutted to the closed surface P5 under the driving of the X-axis driving assembly 303, so as to simplify the motion control logic of the nozzle 307.

[0107] In this embodiment, the connecting surface P6 can be configured as a plane, an outwardly convex arc surface, or an inwardly concave arc surface, and the specific shape thereof can be determined according to actual requirements.

[0108] In some embodiments, referring to Figure 12 , the cleaning assembly 100 further includes a second elastic member 52. The second elastic member 52 is connected between the hole sealing portion 40 and the base portion 30. In this way, when the nozzle 307 moves to the hole sealing portion 40 and contacts the closed surface P5, the second elastic member 52 can exert an elastic force on the hole sealing portion 40, so as to enable the closed surface P5 to keep sealing the extrusion opening K of the nozzle 307, and ensure that the consumables in the nozzle 307 do not leak out.

[0109] The second elastic member 52 can be configured as an elastic element such as a spring, a tension spring, or an elastic column.

[0110] 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 cleaning assembly characterized by, Comprising: a plurality of bristle groups, the plurality of bristle groups being distributed along a first direction, each of the plurality of bristle groups comprising a plurality of bristle portions distributed along a second direction, wherein the bristle portions of two adjacent bristle groups are staggered along the first direction, and wherein the first direction is orthogonal to the second direction.

2. The cleaning assembly of claim 1, wherein: the cleaning assembly further comprises a base portion, and the plurality of bristle groups are disposed on one side of the base portion along a third direction, wherein the third direction is orthogonal to the first direction and orthogonal to the second direction; the bristle portions have a first inclined surface and a second inclined surface, the first inclined surface being disposed on one side of the second inclined surface along the first direction, and the distance between the first inclined surface and the second inclined surface along the first direction gradually decreases in a direction away from the base portion.

3. The cleaning assembly of claim 2, wherein: the bristle portions further comprise a first top surface and a second top surface, the first top surface being connected to the first inclined surface and extending in a direction approaching the second inclined surface, and the second top surface being connected to the second inclined surface and extending in a direction approaching the first inclined surface, the first top surface being any one of a flat surface, a concave surface, or a convex surface, and the second top surface being any one of a flat surface, a concave surface, or a convex surface.

4. The cleaning assembly of claim 2, wherein: the angle between the first inclined surface and the second inclined surface is in a range of 90 degrees to 135 degrees.

5. The cleaning assembly of claim 1, wherein: the bristle portions comprise a first brush portion and a second brush portion, the first brush portion and the second brush portion have a first gap therebetween, and two adjacent bristle groups have a second gap therebetween.

6. The cleaning assembly of claim 1, wherein, for use in a 3D printer having a nozzle, the cleaning assembly further comprises a sealing portion, the sealing portion being disposed on one side of the plurality of bristle groups, the sealing portion having a sealing surface configured to seal an extrusion opening of the nozzle.

7. The cleaning assembly of claim 6, wherein: the sealing surface is a flat surface, and the height of the sealing surface in a third direction is lower than the height of the top surface of the bristle portions in the third direction, or the height of the sealing surface in the third direction is consistent with the height of the top surface of the bristle portions in the third direction.

8. The cleaning assembly of claim 6, wherein: the cleaning assembly further comprises a base portion, the base portion having a mounting surface, the plurality of bristle groups being disposed on the mounting surface, and the sealing portion being disposed on the mounting surface, the sealing surface being spaced apart from the mounting surface, the sealing portion further comprising a connecting surface, the connecting surface being disposed obliquely relative to the mounting surface, and the connecting surface being connected between the mounting surface and the sealing surface.

9. A heat bed apparatus, characterized by, Comprising: a build plate configured to carry a printed model; the cleaning assembly of any one of claims 1 to 8, the cleaning assembly being disposed on an edge portion of the build plate.

10. A 3D printer characterized by, A cleaning assembly as claimed in any one of claims 1 to 8, configured to clean a nozzle.

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