Jaw crusher with a hydraulic cylinder overload arrangement

Abstract

A jaw crusher ( 10 ) includes a fixed jaw ( 16 ) and a swing jaw ( 18 ), which define a crushing chamber ( 26 ). The swing jaw ( 18 ) is mounted for cyclic movement in the direction of the fixed jaw ( 16 ), for crushing material between the two jaws. A cross beam ( 42 ) is adjustably received in apertures ( 40 ) provided in the walls ( 12, 14 ) of the frame ( 11 ). A toggle plate ( 54 ) is operatively arranged between the rear of the swing jaw ( 18 ) and the front of the cross beam ( 42 ). An hydraulic cylinder arrangement ( 60 ) includes a pair of cylinders mounted one on either side of the frame ( 11 ) in a respective aperture ( 40 ), in operative engagement with the rear of the cross beam ( 42 ). In use, the cylinders are pressurised to a predetermined value to provide an adjustable, pre-loaded reaction against the toggle plate ( 54 ), in line with the side walls.

Description

technical field [0001] The present invention relates to jaw crushers, particularly, but not exclusively, to jaw crushers for crushing stone material. Background technique [0002] For example, crushing equipment is often used to process mined material for the production of aggregates. For the crushing of stone and similar materials there are various known types of crushing equipment, one of which is known as a jaw crusher. [0003] A conventional jaw crusher includes a frame having side walls and a pair of jaws, fixed and movable, interposed therebetween. Both the fixed jaw and the movable jaw have crushing surfaces arranged in spaced relation to define a crushing chamber for containing material to be crushed. The movable jaw is movable between a first position in which the crushing face of the movable jaw is inclined to a crushing face of the fixed jaw and a second position in which the crushing face of the movable jaw It is roughly parallel to the crushing surface of th...

AI Technical Summary

Problems solved by technology

[0012] The configuration of GB812507 has the disadvantage that in normal operating conditions the beam is bent by the action of the cylinders as the tie rods and associated cylinders are outside the walls of the jaw crusher frame

[0015] Yet there is problem in the jaw crusher of US4927089

For example, the life of the seals in the cylinder can be compromised due to the considerable pressure generated in the cylinder during the crushing process, typically from zero to maximum pressure for each cycle of the movable jaw

Also, for example when the cylinder compresses the fluid during the shredding cycle, the hydraulic fluid is compressed to a certain extent, thus compromising the shredding efficiency

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