Extruding head of FDM 3D printer

Abstract

The invention discloses an extruding head of an FDM 3D printer. The extruding head comprises a heating block, a brass nozzle (2), a stainless steel choke (5), a tetrafluoromethane liner pipe (6), a single-head heating pipe (7) and a temperature sensor (8), and further comprises tetrafluoromethane thermal-insulating housings (3 and 4), wherein the heating block is a brass heating block (1), the tetrafluoromethane thermal-insulating housings are arranged outside the brass heating block, a tetrafluoromethane anti-sticking and anti-oxidizing layer (9) is additionally arranged on the outer surface of the brass nozzle (2), so that the brass nozzle is not oxidized, without sticking an extruded material, a limit flange (10) is arranged in the middle of the stainless steel choke (5), the tetrafluoromethane liner pipe extends into the brass nozzle (2) and penetrates through the inside of the stainless steel choke (5) with the limiting flange and the inside of the brass nozzle (2), so that no gap exists in the tetrafluoromethane liner pipe at the connecting part of the stainless steel choke (5) and the brass nozzle (2) to prevent the extruded material from leaking. The extruding head has the advantages of stable performance, stability and durability, no leakage and sticking, no blockage, good printing effect, and the like.

Description

technical field [0001] The invention belongs to an extrusion head of an FDM 3D printer. Background technique [0002] At present, the extrusion heads used by desktop-level FDM 3D printers on the market are basically wrapped with asbestos tiles and high-temperature tapes to insulate the heating block of the print head and fix the temperature probe, and the surface of the brass nozzle lacks coating protection, and the stainless steel throat There is also a gap at the connection between the PTFE liner of the pipe and the brass nozzle, and there is no limiter on the stainless steel throat. The high-temperature tape of such a print head is easy to loosen during long-term high-temperature work and mechanical vibration, and the reliability is poor, and problems are prone to occur in continuous work. In addition, brass nozzles lacking a protective layer are easily oxidized at high temperatures, which not only shortens the service life of the brass nozzles, but also easily sticks to...

AI Technical Summary

Problems solved by technology

The high-temperature tape of such a print head is easy to loosen during long-term high-temperature work and mechanical vibration, and its reliability is poor, and it is prone to problems in continuous work.

In addition, brass nozzles lacking a protective layer are easily oxidized at high temperatures, which not only shortens the service life of the brass nozzles, but also easily sticks to the extruded material during printing. adverse effect on the printing effect

There is a gap between the PTFE lining tube of the throat pipe and the brass nozzle connection. When using the extrusion material with strong fluidity, the material is easy to leak from this gap, which will pollute the extrusion head and cause blockage.

The stainless steel throat has no limit device, and when it is installed on a multi-extrusion head FDM 3D printer, it cannot ensure that the heights of the ends of the multiple extrusion heads are strictly consistent, resulting in poor printing effects when multi-head printing

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