Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1996-02-11
1998-07-07
Husar, John M.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241216, B02C 204
Patent
active
057756074
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an improved system for preventing free rotation of the head or cone, of a gyratory crusher which also is able to provide sealing.
BACKGROUND OF THE INVENTION
The system of the present invention is particularly suited for use with a gyratory crusher of the type disclosed in Australian patent specification 618545 (AU-B-19935/88). However, while the system will be described in large part with reference to a crusher of that type, it is to be understood that the system also has application to other types of gyratory crushers.
Australian patent specification 618545 teaches in relation to its gyratory crusher that, in the absence of any resistive force being applied to the head of the crusher during revolution of the same about the central axis, the head may rotate relative to the bowl and to a shaft by which gyratory motion is imparted to the head. It is further stated that when frangible or friable material is deposited into the crushing chamber defined by the bowl, and is received within the confines of the annular nip between the bowl and head, the material will tend to resist rotation of the head relative to the bowl.
When there is no frangible or friable material present in the crushing chamber, the heads of most gyratory crushers rotate relative to the bowl if they are not restrained. The heads of crushers which are mounted on and supported by commercial ball and roller bearings often rotate at virtually the same speed as the drive shaft gyrates. Such rotation is undesirable, since: of the crusher is called the closed side setting (CSS) and this determines the size of the resultant product (crushed material). The CSS is adjusted whenever necessary to maintain the size of the product within the desired limits. It is usual for the CSS to be audited by measurement periodically and in many crusher installations this is most conveniently done by lowering a soft deformable material such as lead, on a suspension wire, into the crushing chamber whilst the crusher is operating without feed. After it is crushed, the deformable material is withdrawn, by raising the suspension wire, and its thickness measured to determine the CSS. In other installations the deformable material can be dropped into the crushing chamber and recovered, for measurement, from below the crusher. However, when the head is rotating at approximately the speed of gyration such auditing procedures are impossible. It is far too dangerous to lower a suspended item into the chamber and in any case the rotation distorts the deformable material making accurate CSS measurement impossible. crushing chamber the entry of new feed material is impeded and chamber wear is excessive. Firstly the new material is ejected by the centrifugal force transferred from the head. Secondly the head and bowl suffer premature gouging wear by the new material as the rotational inertia (energy) of the head is absorbed. For these reasons the natural tendency of the head to rotate when the crusher is running with the crushing chamber empty is not acceptable to the industry. A head anti-rotation device is required.
Specific to its type of gyratory crusher, but also of relevance to others, Australian patent 618545 further teaches that, when a gyratory crusher is crushing frangible or friable material, there is often a slight circular inching of a point on the lower periphery of the head with respect to an adjacent point on the circumferential wall of the discharge opening in a clockwise or anti-clockwise direction during nutation (gyration) of the head. The circular inching (rotation) of the head cannot be resisted except by the application of a high restraining force, and it is not appropriate to restrain it because: expensive, bowl by the friable and frangible material, and causing wear channels in the bowl and head which allow oversize product to pass through the crusher and mix with correctly crushed product, such that close control of crushed product grade is impossible. to apply adequate but minimal restraint to
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Bayliss John Andrew
Shannon James William
Husar John M.
Wescone Crushers Pty, Ltd.
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