PLANT FOR MANUFACTURING HOLLOW ITEMS FROM THERMOPLASTIC MATERIALS Russian patent published in 2001 - IPC

FIELD: devices for plastic refining; manufacture of containers such as bottles, flasks by bulge extrusion. SUBSTANCE: plant has stand that mounts extrusion machine designed for manufacturing tubular blanks before bulging; it also has two forming platforms. The latter are installed on two pairs of rocker-arms crossing in vertical plane provided with angular displacement drive and blown form assembled of two semi-forms. Plant also has form closing drive provided that has two rocker-arm-and connecting-rod mechanisms with axial- displacement ram. Crossing rocker-arms are hinged in pairs through connecting rods. Angular- displacements drive is made in the form of two dual-action piston-type rams fixed together and provided with single-sided opposing rods. Form-closing drive has balancer and connecting rod both installed on platforms symmetrical to plane of closure. Connecting rods are kinematically joined to mechanisms and axial-displacement ram. The latter is mounted on platform for swinging in plane of balancer. EFFECT: simplified design due to fixed kinematic coupling between platforms; improved reliability and effectiveness due to minimizing angles of platform turn. 4 dwg