Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Reexamination Certificate
2000-04-20
2001-12-11
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
Reexamination Certificate
active
06328237
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a gyratory crusher having inner and outer shells and a crushing chamber there between.
BACKGROUND ART
Gyratory crushers, such as cone crushers and spindle crushers, generally comprise an outer shell which is fixedly connected to a body, and an inner shell which is arranged radially inside said outer shell. The inner shell is connected to an internal shaft member for executing a gyratory movement. Between the two shells a crushing chamber is defined, in which crushing of a material is carried out as the inner shell moves.
It is common for the shaft member to be vertically adjustable for changing an axial distance between the two shells. As a result, the particle size of the crushed material can be adjusted. The vertical adjustability is usually achieved by the shaft member being supported by a piston member which is vertically adjustable in a cylinder member.
The shaft member, which must be rotatable relative to the piston member, is mounted in a thrust bearing which is arranged between the shaft member and the piston member and to which a medium for promoting the function of the bearing, suchas a lubricant or hydraulic fluid, must be supplied during operation of the crusher.
The medium is supplied to the thrust bearing from a tank via a transport duct extending through the cylinder member and the piston member. In the transition between the cylinder member and the piston member, the duct is formed on the side of the cylinder member as a small opening and on the side of the piston member as an area of a large extent in the axial direction, thus allowing the medium to be transferred in each individual position of the piston. It is then necessary for the axial length of the area of the duct in the piston member adjacent to the cylinder member to be at least as great as the length of stroke of the piston member, i.e. the distance between the top and bottom position of the piston member.
A problem in prior-art gyratory crushers is that they are large and unwieldy, and especially they need a relatively large space in the vertical direction. This causes difficulties and a limited possibility of choosing the position of such crushers. Particular difficulties exist in mobile crushers.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a gyratory crusher which is improved in relation to prior-art constructions.
A specific object is to provide a crusher construction which permits a lower height in relation to the crushing capacity than in existing constructions.
According to the invention, these and other objects which will appear from the following specification are now achieved by a gyratory crusher which is of the type described by way of introduction and which in addition has a novel and improved transport duct system.
According to the invention, the gyratory crusher thus has a transport duct for supplying to a thrust bearing a medium promoting the bearing function via a piston member, said thrust bearing being arranged between the piston member and a shaft member supported thereby. The transport duct is defined upstream of the piston member by a transfer means, which has at least a portion or a part which is displaceable relative to the piston member and at least a portion or a part which is displaceable relative to a cylinder member, in which the piston member is displaceable.
According to one aspect of the invention, there is thus provided a transport duct, the extent or length of which in the axial direction depends on the position of the piston member.
This makes a reduction of the axial extent of the piston member possible since the piston member need not accommodate the entire extent of the transport duct in all axial positions.
Preferred embodiments are defined in the subclaims. In one embodiment, the piston member is thus axially movable between an upper and a lower position, between which the distance is greater than the extent of the piston member in the axial direction. This results in a crusher, in which the piston member, in spite of a great length of stroke, takes up little space in the vertical direction.
The transfer means comprises in a particularly preferred embodiment at least one annular element which is movable in the axial direction.
In a special embodiment, the annular element is movably arranged between the piston member and the cylinder member. The transport duct extends from an inlet in the cylinder member radially through the annular element to the piston member. In each transition between cylinder member, annular element and piston member, the transport duct has an axially extended transfer area. By the duct along its radial extent being provided with two axially extended transfer areas, the length of each of these transfer areas could be halved compared with prior-art constructions. Thus, the height of the piston member could practically be halved without any reduction of the capacity. A particular advantage of this embodiment is that the transfer member can be made in one piece, which means that the number of movable parts can be kept small.
In another embodiment, with or without one or more annular elements, the transfer means has an axially adjustable length, such that a predetermined length is assigned to each piston position. Owing to a thus variable length, the piston can be given a length of stroke which is essentially an unlimited number of times greater than the length of the piston member in the axial direction The transfer means can take over the greater part of the extent of the transport duct in the axial direction in different positions.
In a particularly preferred embodiment, the adjustable length of the transfer means has been achieved by the transfer means being telescopic and comprising a plurality of telescopically movable, annular elements which are preferably slidingly displaceable relative to each other. An upper element is connected to the piston member, and a lower element is connected to the cylinder member in a fixed axial position. This solution is extremely reliable owing to its simple design.
In an especially preferred embodiment, the telescopic transfer means is recessed in the piston member and/or in the base of the cylinder member. This results in a further decrease of the height.
REFERENCES:
patent: 4084756 (1978-04-01), Coxhill
Luedeka Neely & Graham P.C.
Rosenbaum Mark
Svedala-Arbra AB
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