Material wiping mechanism for inverted 3D printer

Abstract

The utility model relates to the technical field of 3D printing, and provides a material wiping mechanism for an inverted 3D printer, which comprises a material wiping rack and a spray head cleaning mechanism, the spray head cleaning mechanism is placed in the material wiping rack, the spray head cleaning mechanism comprises a baffle plate, the baffle plate is provided with a material wiping hole for a spray head of the printer to pass through, and the material wiping hole is communicated with the spray head cleaning mechanism. When the spray head moves, waste materials are rubbed down, and rapid cleaning of the waste materials at the spray head is achieved; the baffle plate is arranged above the material wiping holes, so that the material wiping holes are mutually bonded together, the clustered filaments are converged into a clustered shape, and subsequent cleaning is facilitated; the waste cleaning mechanism is arranged, a push broach is pushed through a push rod to push waste into the waste collecting mechanism, and the waste is collected in time; the lifting mechanism is arranged, so that the material wiping rack can be driven to move up and down, more moving space is provided for the spray head arranged below the printing bottom plate under the condition that the area of the printer is not changed, and an effective solution is provided for the overflow problem of the inverted 3D printer and the cleaning of the spray head.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a material wiping mechanism for an inverted 3D printer. Background Art

[0002] Traditional 3D printers based on the principle of "fused deposition modeling" (FDM / FFF) include motion components, print heads, print bases, etc. Among them, the print head is always located above the print base, and the print material (such as plastic) is "deposited" on the print base from top to bottom by gravity. However, this printing method makes the overall center of gravity of the machine higher, and it is easy to vibrate during high-speed printing. Vibration will make the printer unstable, affect the printing quality, and also limit the increase in the speed of the printer. Therefore, there is currently an inverted 3D printer, that is, the print head is always located below the print base, so that printing can be performed from bottom to top. However, the wiping problem of the inverted 3D printer cannot be solved by the same wiping mechanism as the traditional 3D printer. In view of this, a wiping mechanism for an inverted 3D printer is designed, which effectively solves the wiping problem and nozzle cleaning problem of the inverted 3D printer. Utility Model Content

[0003] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0004] The utility model provides a material wiping mechanism for an inverted 3D printer, comprising a material wiping frame and a nozzle cleaning mechanism, wherein the nozzle cleaning mechanism is placed in the material wiping frame and comprises a baffle plate, wherein a material wiping hole for the nozzle of the printer to pass through is arranged on the baffle plate, and waste materials are rubbed off when the nozzle moves.

[0005] Furthermore, a movable space for a baffle is provided in the wiping machine frame, a first elastic member is provided in the movable space, and the baffle is configured to restore its original position under the action of the first elastic member.

[0006] Furthermore, the nozzle cleaning mechanism also includes a baffle, which is arranged above the wiping hole, and the area of ​​the baffle is at least equal to the area of ​​the wiping hole.

[0007] Furthermore, the wiping hole is a tapered hole, allowing the nozzle to move slightly relative to the tapered hole in the tapered hole.

[0008] Furthermore, the nozzle cleaning mechanism also includes a wiping component.

[0009] Furthermore, the wiping component includes a brush or a rotatable cleaning member wrapped with a Teflon tube.

[0010] Furthermore, the wiping material assembly includes a cleaning hopper and a pouring port, wherein the pouring port is connected to the bottom of the cleaning hopper; a first slot is provided at the bottom of the cleaning hopper to allow the nozzle to pass through, and a material guiding transition surface is provided between the first slot and the pouring port.

[0011] Furthermore, the wiping mechanism also includes a waste cleaning mechanism, which is arranged at one end of the wiping frame; the waste cleaning mechanism includes a push rod, a push rod bracket and a push knife, the push rod bracket is fixed on the wiping frame, the push rod bracket is provided with a guide hole, a push rod is provided in the guide hole, one end of the push rod is fixedly connected to the push knife, the push knife is placed on the baffle, a second elastic member is sleeved on the push rod, and one end of the second elastic member is fixedly connected to the other end of the push rod.

[0012] Preferably, the cleaning piece or brush is fixed on the push rod bracket and arranged above the push knife.

[0013] Furthermore, the wiping mechanism also includes a waste collecting mechanism, which is arranged at the bottom of the wiping frame and away from the waste cleaning mechanism; the waste collecting mechanism includes a gate device, which includes a gate and a driving device.

[0014] Furthermore, the driving device includes a long connecting shaft, a short connecting shaft, a bearing and a torsion spring, wherein the torsion spring is sleeved on the long connecting shaft, and the gate is movably connected to the wiping machine frame through the long connecting shaft; the bearing is arranged on the short connecting shaft and at the edge of the gate. When subjected to external force, the external force exerts a force on the gate through the bearing to open the gate.

[0015] Furthermore, the wiping mechanism also includes a lifting mechanism, and the lifting mechanism can drive the wiping frame to move up and down.

[0016] The utility model has the following beneficial effects:

[0017] (1) The utility model provides a wiping hole on the baffle plate, so that the nozzle can be directly moved into the wiping hole. The waste material can be wiped off through the wiping hole by a slight movement, thereby realizing rapid cleaning of the waste material at the nozzle;

[0018] (2) A baffle is provided above the wiping hole of the utility model, so that the ejected consumables cannot be cooled in time, causing them to stick together, and the clumped filaments are converged into a mass, which is convenient for subsequent cleaning;

[0019] (3) The utility model is provided with a waste cleaning mechanism, which pushes the pusher through the push rod to push the waste into the waste collection mechanism, thereby collecting the waste in a timely manner;

[0020] (4) The utility model is provided with a lifting mechanism, which can drive the wiping frame to move up and down, thereby providing more movement space for the nozzle arranged under the printing base plate while ensuring that the printer area remains unchanged, and providing an effective solution to the overflow problem and nozzle cleaning of the inverted 3D printer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the wiping mechanism of Example 1.

[0022] Figure 2 It is a schematic diagram of the structure of the baffle in Example 1.

[0023] Figure 3 The structure of the wiping assembly including the hopper in Example 2 is schematically shown. Figure 1 .

[0024] Figure 4 The structure of the wiping assembly including the hopper in Example 2 is schematically shown. Figure 2 .

[0025] Figure 5 The structure of the wiping assembly including the hopper in Example 2 is schematically shown. Figure 3 .

[0026] Figure 6 It is a schematic diagram of the wiping mechanism including a cleaning piece or a brush in Example 2.

[0027] Figure 7 Schematic diagram of the wiping mechanism including the waste cleaning mechanism in Example 4.

[0028] Figure 8 Schematic diagram of the wiping mechanism including the waste collection mechanism in Example 5.

[0029] Fig. 9 It is a schematic diagram of the gate in Example 5.

[0030] Fig.10 It is a schematic diagram of the receiving tray in Example 5.

[0031] Fig.11 It is a schematic diagram of the wiping mechanism including the lifting mechanism in Example 6.

[0032] Fig.12 It is a schematic diagram of the wiping mechanism in Example 7.

[0033] Fig.13 It is a schematic diagram of the placement position of the wiping mechanism in Example 7. DETAILED DESCRIPTION

[0034] The specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. It should be pointed out that the embodiments are only specific explanations of the utility model and should not be regarded as limitations of the utility model. The purpose of the embodiments is to enable those skilled in the art to better understand and reproduce the technical solutions of the utility model. The protection scope of the utility model shall still be based on the scope defined in the claims.

[0035] Example 1

[0036] This embodiment provides a material wiping mechanism for an inverted 3D printer, which is used to remove excess consumables on the nozzle assembly of the inverted 3D printer. The nozzle assembly includes a nozzle, a heat sink, a housing, a printing fixing plate, etc. The nozzle assembly can be moved under the action of an X-axis transmission mechanism and a Y-axis transmission mechanism.

[0037] like Figure 1 As shown, the wiping mechanism includes a wiping frame 1 and a nozzle cleaning mechanism 3, wherein the nozzle cleaning mechanism 3 is placed in the wiping frame 1, and the nozzle cleaning mechanism 3 includes a baffle 31, on which a wiping hole 31 is provided for the nozzle of the printer to pass through, so that waste materials are rubbed off when the nozzle moves.

[0038] The wiping frame 1 is L-shaped as a whole, and includes a vertical portion 11 of the wiping frame and a transverse portion 12 of the wiping frame. The transverse portion 12 of the wiping frame includes a first transverse portion 121 and a second transverse portion 122. The first transverse portion 121 and the second transverse portion 122 are parallelly arranged on both sides below the vertical portion 11 of the wiping frame.

[0039] The nozzle cleaning mechanism 3 is used for cleaning the nozzle of the sticky material; the baffle 31 can move in the wiping frame 1, and the two sides of the wiping frame 1 are provided with movable space 10 for the baffle, specifically, the first transverse part 121 and the second transverse part 122 are provided with movable space, and a first elastic member is also provided in the movable space, and the baffle is configured to restore it to its original position under the action of the first elastic member, that is, the first elastic member is connected to the baffle 31, when the nozzle moves left and right, the baffle is also driven to move slightly, when the wiping is completed, the nozzle leaves, and the baffle 31 can be restored to its original position under the action of the first elastic member.

[0040] like Figure 2As shown, the baffle 31 includes a first baffle portion 311, a second baffle portion 312 and a third baffle portion 313, the first baffle portion 311, the second baffle portion 312 and the third baffle portion 313 are connected in sequence, the width of the first baffle portion 311 is greater than the width of the second baffle portion 312, and at the connection between the first baffle portion 311 and the second baffle portion 312, vertical baffles 315 are provided on both sides of the first baffle portion 311, and the vertical baffles 315 are used to be fixedly connected to the first elastic member 33; the length of the activity space is slightly greater than the length of the first baffle portion 311; an inclined surface 314 is provided between the third baffle portion 312 and the second baffle portion 312, when the waste is pushed to the inclined surface 314 by the push rod, it can have a buffering effect on the movement of the waste, and the third baffle portion 313 is vertically arranged below the second baffle portion 312.

[0041] The second baffle plate portion 312 of the baffle plate is provided with a wiping hole 310 for the nozzle to pass through. When the nozzle moves, the waste material is shaken off to achieve the purpose of waste cleaning. Preferably, the wiping hole is a conical hole, and the conical bottom surface of the wiping hole is arranged in the direction of the upper surface of the baffle plate, so that the nozzle can move slightly in the conical hole relative to the conical hole. The slight movement can be a reciprocating movement of 1mm, 3 reciprocating movements, and a moving speed of 500mm / s to achieve waste cleaning.

[0042] Example 2

[0043] This embodiment provides a wiping mechanism. In order to better clean the waste material on the nozzle, the nozzle cleaning mechanism further includes a wiping component based on the first embodiment. The wiping component is used to clean the waste material on the nozzle.

[0044] like Figure 3-5 As shown, the wiping material assembly is used to clean the waste on the nozzle; the wiping material assembly 23 includes a cleaning hopper 231 and a pouring port 232, and the bottom of the cleaning hopper 231 is provided with a first slot 2311 that allows the nozzle to pass through.

[0045] The pouring port 232 is connected to the lower part of the cleaning hopper; a material guiding transition surface is provided between the first slot 2311 and the pouring port.

[0046] The opening 2312 of the cleaning hopper 231 faces upward, and the material guide transition surface 233 includes a first inclined surface and a first plane in sequence from the opening 2312 to the pouring port 232. Another material guide transition surface 233 includes a first inclined surface 234, a first plane 235, a second inclined surface 236 and a second plane 237 in sequence from the opening 2312 to the pouring port 232, wherein the second plane 237 is connected to the pouring port, and there is a certain angle between the first plane 235 and the second plane 237. For example, in this embodiment, the first plane 235 is a horizontal plane, and the second plane 237 is a vertical plane. Through this inclined plane + plane + inclined plane + vertical plane method, the nozzle residual material (molten plastic) is removed. ) forms a guiding transition surface so that it can flow out from the pouring port in a molten state. In addition, since a protective cover is provided during the printing process, the temperature inside the machine will be relatively higher than the ambient temperature, and the residual material will not solidify so quickly. Generally speaking, it can solidify after the blanking is completed. Even if some plastics solidify in advance and stick to a certain plane or inclined surface in the material guiding transition surface 233, they can be cleaned up after the printing is completed or after a certain period of time. Because the residual material cleaning device provided by the present invention is a relatively independent part of the structure relative to the functional body of the printer, as long as the residual material on the functional body of the printer is cleaned up to avoid affecting the printing process, the present invention has completed its mission.

[0047] The entire eraser assembly 23 is movably arranged on one side of the print head assembly. When the second extruder motor 250 drives the print head to move horizontally, it can drive the print head to move toward or away from the eraser assembly 23. The first slot 2311 is arranged above the plane where the print head is located or part of the print head can be moved into the first slot 2311. When the print head moves to the eraser assembly 23, it can extend into the first slot 2311. Preferably, the first slot 2311 is located on the first inclined surface 234 and the first plane 235. Since the print head is inclined upward and partially protrudes from the printing platform, the first slot 2311 part located on the first inclined surface 234 can accommodate the height of the print head, so that it can smoothly enter the first slot. Then the first slot part located on the first plane 235 is close to the print head and can receive the residual material extruded from the print head. This material receiving process can also be said to be a kind of scraping of the extruded residual material.

[0048] Preferably, the bottom of the eraser assembly 23 (on the bottom surface of one side of the pouring port) is connected to the rotating arm 2302 via a fastener 2301, and the rotating arm 2302 is connected to the rotating motor 2303 below. In this way, the eraser assembly 23 can move closer to or farther away from the print head assembly 7 by rotating the rotating motor 2303. When eraser wiping is not needed, such as during formal printing, or when printing is stopped, the nozzle does not discharge material, or the position of the printing platform needs to be adjusted, the eraser assembly 23 can be turned out to make way to prevent the eraser assembly 23 from blocking the movement of the printing base plate.

[0049] Preferably, a brush assembly 238 is provided on the outer side of the first slope 234 for cleaning excess plastic melted on the nozzle. When the nozzle moves into the brush, waste will remain in the brush, and the brush assembly 238 only needs to be removed and cleaned or replaced regularly.

[0050] Preferably, a brush assembly 238 may also be provided on the outer side of the first plane.

[0051] like Figure 6 As shown, the wiping component can also be a rotatable cleaning member or brush wrapped with a Teflon tube.

[0052] The cleaning piece or brush 35 is fixed on the push rod bracket 42 and is arranged above the push knife 43. When the nozzle moves in the wiping hole 310, the waste on the nozzle can be rubbed off by the cleaning piece or brush 35. The wiping hole is a conical hole. The conical bottom surface of the wiping hole is arranged in the upper surface direction of the baffle, so that the nozzle can move slightly relative to the conical hole in the conical hole. The slight movement can be a reciprocating movement of 1mm, and the moving speed is 500mm / s; or the nozzle is placed in the wiping hole 310 to drive the baffle to slide back and forth, and at the same time, the waste is shaken off during the sliding process to achieve the purpose of waste cleaning.

[0053] Example 3

[0054] This embodiment provides a wiping mechanism. Based on the embodiments 1 and / or 3, the nozzle cleaning mechanism 3 further includes a blocking piece 32.

[0055] like Figure 6 As shown, the baffle 32 is arranged above the erasing hole, and the area of ​​the baffle 32 is at least equal to the area of ​​the erasing hole; the baffle 32 can be fixed on the erasing frame 1. Under the heating state, the thermoplastic material will melt and be pushed out due to the continuous feeding of the material. The ejected consumable will quickly cool into filaments. If there is no baffle 32 to restrict it, the consumable will form loose filaments. After adding the baffle 32, the cooling space of the consumable filaments can be constrained during the cooling and forming process of the ejected consumables. The ejected consumables cannot be cooled in time, and because of the limited space, the filaments will stick to each other, and the clumped filaments will be converged into clumps, which is convenient for subsequent cleaning.

[0056] Example 4

[0057] This embodiment provides an wiping mechanism, which, based on Embodiments 1, 2 and / or 3, further includes a waste cleaning mechanism 4.

[0058] like Figure 7As shown, the waste cleaning mechanism 4 is used to process the waste cleaned by the nozzle cleaning mechanism, and the waste cleaning mechanism 4 includes a push rod 41, a push rod bracket 42 and a push knife 43. The push rod bracket 42 is fixed on the wiping machine frame 1, and a guide hole 421 is provided on the push rod bracket 42. A push rod 41 is provided in the guide hole 421. A second elastic member 44 is sleeved on the push rod 41. One end of the push rod 41 is fixedly connected to the push knife 43, and the other end of the push rod 41 is fixedly connected to the second elastic member 44 through a gasket and a nut. The push rod 41 can drive the push knife 43 to reciprocate along the axial direction of the push rod at the push rod bracket 42 under the joint action of the second elastic member 44 and force; the shape of the push rod 41 includes but is not limited to a rectangular parallelepiped.

[0059] The push knife 43 is placed on the baffle 31, and the length of the push knife 43 is equal to the distance between the first transverse portion 121 and the second transverse portion 122, so as to ensure that the waste falling on the baffle 31 can be pushed by the push knife 43 to the waste collection mechanism 5 or the receiving tray.

[0060] Example 6

[0061] This embodiment provides a material wiping mechanism, which, based on embodiments 1, 2, 4 and / or 5, further comprises a waste material collecting mechanism 5. The waste material collecting mechanism is arranged at the bottom of the material wiping frame and is far away from the waste material cleaning mechanism.

[0062] like Figure 8 As shown, the waste collection mechanism 5 is arranged below the transverse part of the erasing frame and close to the vertical part of the erasing frame; the waste collection mechanism 5 includes a gate device, and the gate device includes a gate 251 and a driving device; the driving device includes a long connecting shaft 252, a short connecting shaft 253, a bearing 254 and a torsion spring 255, the torsion spring 255 is sleeved on the long connecting shaft 252, and the gate 251 is movably connected to the erasing frame 1 through the long connecting shaft 252; the bearing 254 is arranged on the short connecting shaft 253 and arranged at the edge of the gate 251, when subjected to external force, the external force exerts an action force on the gate 251 through the bearing 254 to open the gate 251. The gate 251 includes two left and right gates, and the two gates and the erasing frame 1 form a third placement space for placing waste.

[0063] like Fig. 9As shown, a first connecting end 2511 is provided on one side of the gate 251, a third connecting hole 2512 is provided in the first connecting end 2511, a second connecting end 2513 is provided on the other side of the gate 251, and the second connecting end 2513 is arranged at the end of the gate 251, a fourth connecting hole 2514 is provided in the second connecting end 2513; a fifth connecting hole matching the third connecting hole 2512 is provided on the erasing machine frame 1, the long connecting shaft 252 and the torsion spring 255 are placed in the third connecting hole 2512 and the fifth connecting hole, for movably connecting the gate 251; the bearing 254 is arranged on the short connecting shaft 253, and the short connecting shaft 253 is arranged in the fourth connecting hole 2514.

[0064] In some preferred embodiments, the driving device may be a gate driving motor, which directly drives the gate to open and close.

[0065] like Fig.10 As shown, the waste collection mechanism may also be directly a receiving tray 24, the edge of which is provided with a retaining wall 241, which is annular in shape as a whole and is mainly used to prevent the dripping molten plastic from flowing and causing secondary dripping.

[0066] The nozzle 6 may be provided with a Teflon coating to better prevent the extra residual material from overflowing.

[0067] Preferably, the receiving tray 24 can also be directly set on the print nozzle assembly. The receiving tray 24 can be installed on the outer shell of the print nozzle assembly 7 by screws and other connectors to achieve a fixed connection between the receiving tray and the print nozzle assembly. In addition, magnets with opposite charges that attract each other can be installed on the outer shell and the receiving tray 24, respectively, and fixed by the magnetism of the magnets. In this way, the receiving tray 24 can move simultaneously with the nozzle. The receiving tray 24 is provided with a second slot 242, which should be sufficient to allow the nozzle to pass through. In order to avoid damaging the print nozzle, in some ways, the length of the second slot 242 in one direction is slightly larger than the width of the nozzle so as not to squeeze or wear the nozzle, but the priority is to catch the residual material dripping from the nozzle.

[0068] Preferably, the receiving tray 24 is designed to be flat, and its plane size can be 8-15 times the cross-sectional size of the widest part of the nozzle. Since the lower part of the nozzle and the receiving tray are moving below the printing plane during printing, the receiving tray 24 can have a flat receiving plane, and can also be used to catch the waste material dripping from the printing platform during printing. The present invention is provided with a residual material collection device that can move with the nozzle, which can effectively prevent the residual material from sliding off the nozzle, and the size of the residual material collection device of the present invention is much larger than the nozzle width, and can also receive the waste material dropped from the printing platform during printing, avoiding the contamination of the printing equipment caused by the dripping of residual material or waste. In addition, the receiving tray of the present invention can be disassembled and can be removed for cleaning after printing is completed, which is convenient to use.

[0069] Example 6

[0070] This embodiment provides an wiping mechanism, which further includes a lifting mechanism 2 based on Embodiments 1, 2 and / or 3.

[0071] like Fig.11 As shown, the lifting mechanism 2 is also arranged on the wiping frame 1. Specifically, the lifting mechanism 2 is arranged on the vertical part 11 of the wiping frame. The lifting mechanism 2 includes an optical axis 21, a linear bearing 22, a lead screw 23, and a lead screw nut 24, wherein the optical axis 21 is assembled with the linear bearing 22, and the lead screw 23 is assembled with the lead screw nut 24, which drives the wiping frame 1 and the nozzle cleaning mechanism 3, the waste cleaning mechanism 4, and the waste collecting mechanism 5 arranged on the wiping frame 1 to move up and down.

[0072] Example 7

[0073] This embodiment provides a material wiping mechanism.

[0074] like Fig.12 As shown, the wiping mechanism may also include a wiping frame, a nozzle cleaning mechanism and a waste cleaning mechanism 4, and the waste cleaning mechanism 4 is used to clean the waste processed by the nozzle cleaning mechanism; the wiping mechanism may also include a wiping frame, a nozzle cleaning mechanism, a waste cleaning mechanism 4 and a waste collecting mechanism 5, and the nozzle cleaning mechanism 3, the waste cleaning mechanism 4 and the waste collecting mechanism 5 are arranged on the wiping frame 1; the nozzle cleaning mechanism 3 is arranged inside the wiping frame 1, the waste cleaning mechanism 4 is arranged at one end of the wiping frame 1, and the waste collecting mechanism 5 is arranged at the bottom of the wiping frame 1 and away from the waste cleaning mechanism 4; the nozzle cleaning mechanism 3 is arranged between the first transverse portion 121 and the second transverse portion 122, and the waste cleaning mechanism 4 is arranged at one end of the transverse portion of the wiping frame away from the vertical portion of the wiping frame.

[0075] The wiping mechanism can be directly fixed at a certain position of the 3D printer, and the lowest plane of the wiping mechanism is configured to be at the plane where the top of the nozzle is located or slightly lower than the plane where the bottom of the nozzle is located (that is, to ensure that the nozzle can pass through the wiping hole), so that the nozzle can be moved to the bottom of the wiping mechanism under the action of the transmission component to perform the wiping operation;

[0076] like Fig.13 As shown, the material placing and erasing mechanism 102 can be placed on the base cover 100 of the printer. Specifically, a placement hole 103 for placing the material placing mechanism is provided on the base cover 100, and the placement hole 103 matches the overall shape of the material placing mechanism.

[0077] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0078] It should be noted that the technical features not described in detail in the present invention can be achieved by any existing technology.

Claims

1. A material wiping mechanism for an inverted 3D printer, characterized in that: The device comprises a material wiping frame and a nozzle cleaning mechanism, wherein the nozzle cleaning mechanism is placed in the material wiping frame and comprises a baffle plate, on which a material wiping hole for the nozzle of the printer to pass is arranged, so as to wipe off the waste material when the nozzle moves.

2. The material wiping mechanism for an inverted 3D printer according to claim 1, characterized in that: The wiping machine frame is provided with an activity space for a baffle, the activity space is provided with a first elastic member, and the baffle is configured to restore its original position under the action of the first elastic member.

3. The material wiping mechanism for an inverted 3D printer according to claim 1, characterized in that: The nozzle cleaning mechanism further comprises a baffle, which is arranged above the wiping hole, and the area of ​​the baffle is at least equal to the area of ​​the wiping hole.

4. The material wiping mechanism for an inverted 3D printer according to claim 1, characterized in that: The wiping hole is a tapered hole, and the nozzle can be slightly moved relative to the tapered hole in the tapered hole.

5. The material wiping mechanism for an inverted 3D printer according to claim 1, characterized in that: The nozzle cleaning mechanism also includes a wiping component.

6. The material wiping mechanism for an inverted 3D printer according to claim 5, characterized in that: The wiping material assembly comprises a brush or a rotatable cleaning member covered with a Teflon tube.

7. The material wiping mechanism for an inverted 3D printer according to claim 5, characterized in that: The wiping material assembly comprises a cleaning hopper and a pouring port, wherein the pouring port is connected to the bottom of the cleaning hopper; a first slot is provided at the bottom of the cleaning hopper to allow the nozzle to pass through, and a material guiding transition surface is provided between the first slot and the pouring port.

8. The material wiping mechanism for an inverted 3D printer according to claim 5, characterized in that: The wiping mechanism also includes a waste cleaning mechanism, which is arranged at one end of the wiping frame; the waste cleaning mechanism includes a push rod, a push rod bracket and a push knife, the push rod bracket is fixed to the wiping frame, the push rod bracket is provided with a guide hole, a push rod is provided in the guide hole, one end of the push rod is fixedly connected to the push knife, the push knife is placed on the baffle, a second elastic member is sleeved on the push rod, and one end of the second elastic member is fixedly connected to the other end of the push rod.

9. The material wiping mechanism for an inverted 3D printer according to claim 1, characterized in that: The wiping mechanism also includes a waste collecting mechanism, which is arranged at the bottom of the wiping frame and away from the waste cleaning mechanism; the waste collecting mechanism includes a gate device, which includes a gate and a driving device.

10. The material wiping mechanism for an inverted 3D printer according to claim 9, characterized in that: The driving device includes a long connecting shaft, a short connecting shaft, a bearing and a torsion spring. The torsion spring is sleeved on the long connecting shaft, and the gate is movably connected to the wiping machine frame through the long connecting shaft. The bearing is arranged on the short connecting shaft and at the edge of the gate. When subjected to external force, the external force exerts a force on the gate through the bearing to open the gate.

11. The material wiping mechanism for an inverted 3D printer according to claim 1, characterized in that: The material wiping mechanism also includes a lifting mechanism, and the lifting mechanism can drive the material wiping frame to move up and down.

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