Hydraulically adjustable cone crusher and axial bearing assembly of a crusher
The present invention relates to cone crusher. More precisely, the invention concerns a hydraulic setting adjustment system of a cone crusher and an axial bearing assembly suitable for use in the setting adjustment system of a cone crusher.
Known in the patent literature, as well as by those skilled in the art, there are several different crushers, in which the crushing of stones or corresponding hard materials is effected in a crushing chamber defined by two crushing tools having substantially a form of truncated circular cones. This kind of a crusher is called a cone crusher.
It is essential for the quality of the crushed final product that the form of the crushing chamber does not change substantially during the crushing procedure. Essential for the grain size of the produced crushed aggregate is the so called setting of the crusher, in other words, the minimum distance between the crushing tools during a working cycle of the crusher. When the crushing tools wear, the setting of the crusher will be, however, changed. In order to compensate for this change, different setting adjustment solutions have already been used in crushers for a long time. Several solutions of this kind are known in the patent literature as well as by those skilled in the art. Many of those are hydraulically driven.
In accordance with said patent publication, the pressure medium required for the setting adjustment of the crusher is supplied to the pressure medium space of the hydraulic setting adjustment cylinder via a flexible hose in a lubricant channel extending inside the main shaft of the crusher. In accordance with one embodiment of said publication, the hose is attached at its upper end to an extension of the lower end of the adjustment piston, said extension extending through the axial bearing assembly of the crusher, and said extension, as well as the piston itself include a channel for supplying pressure medium through the piston into the pressure medium space of the adjustment cylinder. In accordance with another embodiment of said publication, the hose is attached at its upper end to an extension of the lower end of the adjustment cylinder, said extension extending through the axial bearing assembly of the crusher, and said extension, as well as the bottom of the cylinder itself include a channel for supplying pressure medium to the adjustment cylinder, to the pressure medium space below the piston.
Finnish patent application FI-20040585 (Nieminen et al.) discloses a hydraulically adjustable cone crusher, wherein a piston-cylinder assembly of the hydraulic adjustment system is located in a space between the upper end of the main shaft, attached immobile into the frame, and the crushing head mounted movably with respect to the frame around the upper end of the main shaft. In this way, a crusher with small outer dimensions is provided without having to compromise the size of the crushing chamber and thereby over the capacity of the crusher.
Another drawback of the solution is the fact that a large central aperture must be made in the lower bearing of the axial bearing assembly for the extension of the lower end of the adjustment piston or the adjustment cylinder, said extension extending through the axial bearing assembly, for allowing the movement of the extension when the crusher is in operation. In the solutions in accordance with said patent application the adjustment piston or adjustment cylinder with its lower end extension is an element moving laterally with respect to the lower bearing of the axial bearing assembly. The large central aperture means that the supporting area of the bearing surfaces of the axial bearing assembly are quite small compared to their total surface area, whereby the ability of the crusher to bear vertical crushing loads remains small. This means, in fact, decreasing the capacity of the crusher.
For solving the problems of the prior art there is now invented a hydraulically adjustable cone crusher and an axially arranged axial bearing assembly of the crusher as described below.
Processing your request, Please wait....
