3D printer feeding mechanism

Abstract

The invention belongs to the field of 3D printing equipment, and discloses a 3D printer feeding mechanism. The 3D printer feeding mechanism comprises a feeding base; a feeding driving wheel is arranged on the feeding base; the feeding base is provided with a pressing unit matched with the feeding driving wheel; and the pressing unit comprises a groove pulley matched with the feeding driving wheel,and a pressing force adjusting module for adjusting the pressing force of the groove pulley. The 3D printer feeding mechanism is characterized in that a first annular groove with one contact point with raw materials is arranged on the side surface of the groove pulley; and a second annular groove with two symmetrical contact points with the raw materials and corresponding to the first annular groove is arranged on the side surface of the feeding driving wheel. The 3D printer feeding mechanism can realize stable, complete and precise outputting of the raw materials.

Description

technical field [0001] The invention relates to the field of 3D printing equipment, in particular to a 3D printer feeding mechanism. Background technique [0002] 3D printing technology is a kind of rapid prototyping technology. It is based on digital model files and builds objects by stacking molding materials layer by layer according to the program. Among them, fused deposition modeling technology (FDM technology) is the most widely used. It The thermoplastic filamentary material is transported to the nozzle of the printer by the feeding device and melted at high temperature, then extruded through the nozzle and solidified, and finally stacked in three-dimensional space to form a three-dimensional object. Therefore, maintaining stable and reliable material delivery has become a necessary condition for successful printing. [0003] CN201310676786.4 discloses a 3D printing feeding device. A 3D printing feeding device, comprising a bottom plate and at least two print heads;...

AI Technical Summary

Problems solved by technology

[0005] It can be seen from the above patent application documents that the wire feed wheel with V-shaped grooves in the technical solution of CN201310676786.4 can be elastically floated. The problem is that the V-shaped concave ring and the wire feeding gear are used together. On the one hand, the wire feeding gear is likely to cause excessive material on the surface of the raw material to be scraped off; It is in one point contact with the raw material wire. Since the wire feeding gear is the provider of the main driving force, the pressure at the point of contact is very high. No matter how the pressing force is adjusted, the problem of too much local pressure cannot be overcome, and this problem is easy to cause Raw material silk is very easy to be scratched

[0006] The problem existing in CN201610201355.6 is that neither the guide wheel I nor the guide wheel II can adjust the pressing force, and it will be very passive when the diameter of the raw material wire changes.

And it is similar to CN201310676786.4, the main driving wheel has a rack or similar rack structure, but in CN201610201355.6, it is changed to an inclined rack that is arranged oppositely or at intervals, which is very easy Scratch raw wire

[0007] The existing feeding devices basically use motor-driven feeding gears and bearing rollers to cooperate with rolling feeding. The size of the rolling force cannot be adjusted. If it is too small, it will not be able to transport the material stably. With the prolongation of the working time, the material powder fills the feeding gear, which causes the feeding slipping phenomenon, resulting in printing failure; at the same time, due to the error in the wire diameter of the printing consumables produced by different manufacturers, the rolling pressure varies during the rolling feeding, resulting in uneven feeding. , resulting in a change in the size of the filament

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