Solid material comminution or disintegration – Processes – Miscellaneous
Patent
1987-05-11
1988-12-27
Echols, P. W.
Solid material comminution or disintegration
Processes
Miscellaneous
241 37, 241207, B02C 200
Patent
active
047935600
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the adjustment of the gap width of a cone-type crusher or the like, having a crusher cone rotating tumblingly and being height-adjustable in respect to the crusher housing. The crusher cone, by approaching the crusher housing, can be brought into a reference position and an operating position. The travel of the crusher cone is determined corresponding to a set gap width by which the crusher cone should be distant from the reference position to the operating position. The approach of the crusher cone to the crusher housing is detected by means of a movement detection measurement and the respective crusher cone position is determined by means of a distance measurement.
The gap width, i.e. the width of the crusher discharge gap between the stationary crusher housing and the crusher cone located approximately concentrical on the inside of said crusher housing is of decisive importance for crushing effect and crushing performance of a cone-type crusher or a crusher of similar construction: if the crusher gap width is small, the material to be crushed is crushed more finely than if the crusher gap is larger.
Because of the wear of the crusher cone and crusher housing occurring during operation, the width of the crusher gap changes, with the result that the crushed product slowly shows increasing coarseness. Account of this unwanted effect must be taken by resetting the gap width at least periodically to a set value.
The axial inclination of the crusher cone results in its having a smallest and a largest distance, with corresponding transition zones, from the stationary crusher housing; the point forming the smallest distance is referred to as the effective width of the crusher gap.
In a known method, described in British Pat. No. 1,080,085, the gap width is set, with the crusher cone at rest, by means of a movement detection measurement in the form of a pressure measurement and by a distance measurement such that the crusher cone is first brought to the crusher housing until it touches it and, based on the reference position thus determined, a movement of the crusher cone away from the crusher housing corresponding to a predetermined gap width is initiated. Attainment the reference position is determined via a pressure sensor installed in the circuit of the hydraulic shifting drive of the crusher cone; the amount of travel performed during the opening movement into the operational position is determined by means of the measurement of the volume of liquid displaced by the opening movement. The width of the crusher gap and the amount of wear can be determined by an inductive distance measurement; this is accomplished by means of a measuring piston which penetrates into a coil to a larger or smaller degree. The known method can also be operated automatically according to a preset program, either after every stopping of the crusher cone or less often.
A method for the electrical determination and adjustment of the gap width of a cone-type crusher is already known, for example, from German Laid-Open Application DE-OS 20 51 398.
SUMMARY OF THE INVENTION
It is an object of the invention to describe a method and the components necessary for its operation by which the accuracy of setting the width of the crusher gap is improved. The method should especially be such that, if possible, different types of wear of the crusher cone and/or crusher housing can be taken into consideration when adjusting the gap.
The object is attained by performing successively several approach cycles with the crusher cone rotating, each cycle consisting of the approach of the crusher cone to the crusher housing and the subsequent opening movement away from the crusher housing, and to use the approach values gained with every approach cycle for the formation of a reference value fixing the reference position. On the basis of this reference value, that position of the crusher cone is determined which it should have to maintain the operating position in a desired gap width.
The approach operations conducted
REFERENCES:
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patent: 3078051 (1963-02-01), Patterson
patent: 3328888 (1967-07-01), Gieschen
patent: 3436654 (1969-04-01), Thiele
patent: 3700175 (1972-10-01), Saito
patent: 3944146 (1976-03-01), Stockmann et al.
patent: 4251035 (1981-02-01), Chatwin et al.
patent: 4272030 (1981-06-01), Afanasiev
Patent Abstract No. 53-137467 by Kawasaki Jukogyo K.K.; 11-30-78.
Echols P. W.
Fried. Krupp Gesellschaft mit beschrankter Haftung
Gorski Joseph M.
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