Device and method for detecting a force on an injection moulding machine

Abstract

The invention relates to a device and method for detecting a force on an injection moulding machine for processing plastic materials. According to said invention, a first element () interacting with a mechanical drive and movable at least indirectly thereby in a direction of movement (x) is displaced during said displacement with respect to a second element () positioned near the first element () or oppositely thereto. A force measuring device (D) is used for determining the force applied on the first () and/or second () element by the actuation of the injection moulding machine produced by the relative displacement thereof between the first () and second () elements. A hydraulic chamber whose size is modifiable during the relative displacement associated with a change in pressure of a fluid medium in said hydraulic chamber is firmed between the first () and second () elements, wherein said change in pressure forms an input signal for adjusting the force or pressure and a pressure-relief valve () is used for bypassing the hydraulic medium to a hydraulic medium container (), when the predetermined or predeterminable presser is exceeded in the hydraulic chamber (), thereby making it possible to obtain a device and method for detecting a force on an injection moulding machine which makes it possible to determine said force in a favourable alternative manner and simultaneously ensure an overload protection.