Printing head screw rod device suitable for coarse aggregate concrete 3D printing

Abstract

The invention discloses a printing head screw rod device suitable for coarse aggregate concrete 3D printing. The device comprises a stator and a rotor; the rotor is arranged in the stator, and comprises a straight rod and spiral blades; the spiral blades are uniformly distributed on the straight rod; the stator is a combined piece of a steel pipe and a flexible sleeve; the flexible sleeve is arranged between the spiral blades and the steel pipe; and the spiral blades on the rotor are tightly combined with the flexible sleeve on the stator. The printing head screw rod device can be applied to a concrete 3D printing head; a storage hopper on the printing head is arranged above the printing head screw rod device; and an extrusion port is positioned under the printing head screw rod device. The printing head screw rod device suitable for coarse aggregate concrete 3D printing is reasonable in structure; a wear-resistance rubber sleeve is arranged between the spiral blades of the rotor and a cover of the steel pipe; the blades are tightly combined with the rubber sleeve to guarantee consistent extrusion force, so that the discharge uniformity is improved; and the device can extrude concrete containing aggregates, and effectively widens the application range of a building 3D printer.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a printing head screw device suitable for 3D printing of coarse aggregate concrete. Background technique [0002] For the extrusion print head of the construction 3D printing concrete material equipment, it should be able to extrude concrete with stones, and have stable flow, stable and controllable transmission power, self-priming function, low noise, high efficiency, long life and reliable operation specialty. At present, there are mainly two types of conveying pumps: plunger pump and screw pump, and these two pumps are mainly used for long-distance material transportation. Piston pumps are mainly used for concrete containing coarse aggregate, and screw pumps are mainly used for mortar transportation. [0003] However, since architectural 3D printing technology is a new technology that has emerged in recent years, there is no specific equipment for the extrusion head of t...

AI Technical Summary

Problems solved by technology

[0004] Relying on the extrusion device of eccentric helix and double-wire helicoid, there are obvious limitations in the printing and extrusion of architectural 3D printing concrete:

[0005] (1) The general eccentric crankshaft pump can only convey and extrude the mortar material whose aggregate is sand, but cannot be applied when the aggregate is stone printing concrete material and steel fiber concrete material.

[0006] (2) The eccentric crankshaft pump relies on the tight wrapping of the crankshaft rotor and the double-wire screw rod sleeve, forming, conveying and extrusion pressure. During the conveying process of materials with sand, it is very easy to wear and tear, and there are a small amount of coarse foreign matter in the material , the print head will be stuck, and the fault tolerance rate is low

[0007] (3) The eccentric crankshaft pump that can realize the extrusion of small-sized fine stones is generally large in size, and the power of the power motor required is also large. After being made into a building 3D printing head, it is large and heavy, and it is difficult to control and use

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