Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1996-07-24
1998-07-14
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241214, B02C 206
Patent
active
057791660
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The invention relates to hydraulically adjustable cone crushers or gyratory crushers. Specifically, the invention concerns a safety device to prevent the main shaft from being raised too high when adjusting the setting.
PRIOR ART
A cone crusher has a vertical eccentric shaft provided with an oblique interior hole. The hole mounts a main shaft to which a crushing cone is attached. The crushing cone is surrounded laterally by a crusher body. A crushing chamber is formed by an inner crushing blade attached to the crushing cone and by an outer crushing blade attached to the body. When the eccentric shaft is rotated, the main shaft and thus also the crushing cone are made to move oscillatingly, whereby the gap between the crushing blades will vary at each point during the cycle. The smallest gap occurring during a cycle is called the crusher setting.
The crusher setting is often made adjustable with the aid of a hydraulic system, so that the main shaft can be moved in a vertical direction in relation to the body.
The main shaft is often supported on the body at its top end by using a supporting top bearing. A gyratory crusher generally just means this subordinated kind of cone crusher.
As the crushing blades wear down, the main shaft must be raised correspondingly in order to achieve the same setting. With gyratory crushers in particular there is then a risk of driving the crushing cone into the bearing housing of the supporting top bearing and of thus damaging the crusher. To prevent this, such various limit switches and indicators have been used in crushers of the prior art as usually operate electrically. However, a problem with these has been their unreliable operation.
DESCRIPTION OF THE INVENTION
GENERAL DESCRIPTION
An essential feature of the invention is a bypass channel through which a pressure medium escapes from the cylinder for adjusting the setting upon exhaustion of the adjustment margin. In this way the main shaft cannot be driven too high.
DESCRIPTION OF THE DRAWINGS
The appended drawings are an integrated part of the description of the invention.
FIG. 1 shows a gyratory crusher in accordance with the invention.
FIG. 2 shows en enlarged detail of the crusher shown in FIG. 1.
FIG. 3 shows the adjustment cylinder and the lower part of the main shaft in another gyratory crusher in accordance with the invention.
FIG. 4 shows the adjustment cylinder and the main shaft in a third gyratory crusher in accordance with the invention.
FIG. 5 shows a detail of the crusher shown in FIG. 4.
DETAILED DESCRIPTION
The invention can be applied to all types of cone crushers provided with hydraulic equipment for adjusting the setting. The invention is especially suitable for gyratory crushers equipped with a supporting top bearing and wherein the setting is adjusted by moving the main shaft in relation to the eccentric shaft.
The adjusting plunger is preferably a plunger surrounding the eccentric shaft and with the main shaft pressing against its bottom. In this way a compact structure is obtained, wherein the bypass channel for pressure medium in accordance with the invention can also be conveniently arranged by conducting pressure medium between the cylinder and the plunger into the crusher's lubricating oil circuit.
However, the invention is also suitable for traditional crushers which have a conventional adjusting cylinder and a piston located entirely below the main shaft.
In the solution in accordance with the invention the pressure medium is allowed to flow away from the cylinder to a lower pressure by way of a special bypass channel, when the main shaft reaches its topmost permissible position. The quantity of pressure medium can then no longer be increased in the cylinder and thus the main shaft can not be raised further.
The bypass channel for pressure medium may run between the cylinder and the plunger, through the cylinder or through the plunger. The bypass channel may consist, for example, of one or several grooves, holes or chamfers made in the cylinder wall. The medium ma
REFERENCES:
patent: 2799456 (1957-07-01), Behr
patent: 4339087 (1982-07-01), Pollak
Koski Raimo
Ruokonen Markku
Norderg-Lokomo Oy
Rosenbaum Mark
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