ROTATABLE SPRAY HEAD, MULTI-MATERIAL SPRAYING APPARATUS USING THEREOF, AND METHOD FOR SPRAYING MULTIPLE MATERIALS

摘要

A rotatable spray head, a multi-material spraying apparatus using the rotatable spray head, and a method of spraying multiple materials are provided. The multi-material spraying apparatus includes the rotatable spray head. The rotatable spray head includes an outer shell and an inner shaft tube, for creating relative rotational motion between each other to switch the spraying material. Different materials can be sprayed one at a time through a same ejecting outlet of the rotatable spray head. A recycling step of the method allows the sprayed material to be recycled back to a material supplying pipe or a material holder, before switching to a different spraying material, in order to prevent the mixing of different spraying materials.

主权项

1. A rotatable spray head, comprising:
an outer shell, defining a receiving cavity, an ejecting outlet and at least two radial inlets, wherein the receiving cavity communicates with the ejecting outlet and the radial inlets radially communicate with the receiving cavity; and an inner shaft tube, coaxially received in the receiving cavity, wherein the inner shaft tube defines a central channel and a lateral through hole, one of two openings of the central channel communicates with the ejecting outlet of the outer shell, and the other opening of the central channel is a gas inlet, the lateral through hole is defined on the inner shaft tube and communicates with the central channel; wherein the inner shaft tube is rotatable relative to the outer shell, and the lateral through hole selectively communicates with one of the radial inlets.