MOVABLE-JAW CRUSHER AND CRUSHING MACHINE OF RUBBLE AND SIMILAR PROVIDED WITH SUCH CRUSHER

摘要

A crushing machine (1) of rubble and similar provided with a movable- jaw crusher (3) and a vibrating conveyor (4, 6) adapted to advance the material to be crushed towards the cited crusher (3); the crusher (3) comprising an external casing (7) in which a crushing chamber (8) is obtained, two crushing jaws (9, 10) positioned inside the crushing chamber (8) facing each other so as to define the two side sloping walls of a downward- converging hopper, and a jaw actuating device (11) capable of cyclically moving the two crushing jaws (9, 10) one against the other to crush the material which is conveyed between said crushing jaws (9, 10); the crusher (3) being further provided with at least one ultrasound proximity sensor (30) which is positioned immediately over the top opening (8a) of the hopper formed by said crushing jaws (9, 10), and is capable of outputting a signal indicating the distance (d) existing between the sensor itself and the surface of the mass of material to be crushed present inside said hopper, and of an electronic control unit (31) which is connected to said proximity sensor (30) and is able to instantaneously determine the level of the material to be crushed present inside the hopper formed by said crushing jaws (9, 10).