Closure assembly for an injection unit of plastic material with micrometrical regulation of the closure rod and corresponding device for regulating micrometrically and fixing a threaded element

摘要

There is provided a closure assembly 10 for an injection unit 11 of a plastic material MP, the closure assembly comprising: a closure rod 16; Between an open position P1 in which the closing rod 16 opens the injection hole 13 'of the mold 13 and a closing position P2 in which the closing rod 16 closes the injection hole 13' A drive piston (15) adapted to drive an axial movement (f1) of the drive piston (16); An adjustment element or nut 20 or 21 provided with a fine pitch thread 21a is provided in the inside of the drive piston 15 for axially controlling the closing rod 16 in the closing position P2 in a side- An adjustment element or nut configured to be threaded or threaded in one direction or another direction within a corresponding threaded portion 22b of the seat portion 22; 22a (22a, 22a, 22a, 22a, 22a, 22a, 22a, 22a, 22a, 22a, 22a, 22a, And the elastic washers 30, 31 provided to cooperate with the plurality of projections and the notches 23a, Advantageously, the adjustment element 21 is fully received in the internal seat 22 formed in the drive piston 15, so that it does not protrude from the body 15a of the drive piston.