PRESS FOR INJECTION OF SUBSTANCE INTO MOULD Russian patent published in 2000 - IPC

FIELD: presses for injection material into mould. SUBSTANCE: moulding press has an injector head provided with an axial chamber, feed duct and a non-return means in the form of a gate controlled from the outside. The head axial chamber is divided into a cylindrical injector chamber and an injector duct. The injector chamber accommodates a piston for movement. The injector duct connects the injector chamber to the injector hole in the mould. The feed duct comes out to the axial chamber. The gate is installed for angular turn on part of the feed duct and on part of the injector duct and serves as a common gate for them. In the "filling" condition the gate is installed for covering the injector duct and communicating the feed duct with the injector chamber through the gate sections. The piston occupies in the injector chamber a position removed from the injector hole for filling the chamber with material. In the "injection" condition the gate is installed for covering the feed duct and communicating the injector chamber with the injector duct through the gate section. The piston occupies a position that is nearer to the injector hole for pressing out the material for its injection through the injector hole. The gate can be set to an angular position, in which the feed duct communicates with the injector duct and injector chamber through the gate sections for operation of the injector head in the "clearing" condition. According to the second variation of invention, the non-return means is made in the form of interconnected gates controlled from the outside and installed for angular turn. The gates adjoin each other and are located side by side with the injector hole. The first and second gates can be set in an angular position, in which the feed duct communicates with the injector chamber through the sections of the first gate, and the injector chamber communicates with the injector duct through the section of the second gate for operation of the injector head in the "clearing" condition. EFFECT: employment of the moulding press for injection of materials capable of producing sediments. 17 cl, 5 dwg