Patent GB-190306925-A (GB)
Title: Improvements in Hydro-extractors.
Inventor: MARCHEVILLE MARCEL DE
Filed: 1903-03-25
Granted: 1904-03-25
Abstract: 6925. MarchÚville, M. de. March 25. Hydro - extractors. - Relates to a centrifugal hydro-extractor, in which crystals are drained from the mother-liquors, washed with pure liquid, and finally drained or dried, and in which means are provided for washing the straining-surface, automatically, at intervals. The liquid containing the crystals to be drained and dried is fed on to the inner surface of the drum a, by means of an oscillating distributer c, which is provided with a funnel, and is rocked by levers d, e. The levers are actuated by a cam x, rotated by spur and bevel wheel gearing from a shaft d<2>, which is driven by a belt from the drum shaft. After the material has been washed and drained, it is removed from the drum on to a shoot j, by means of a scraper i, which is supported by a slide k adapted to be moved along the inner surface of the drum, by means of a leading-screw operated by belt gearing and toothed wheels as shown. The drum is of truncated conical form, with the open mouth at the smaller end, and is devoid of any internal flanges. The valve A<1>, Fig. 3<a>, which admits the product to be drained to the distributer, and the valve B<1>, which admits the washing-liquid, are opened and closed by means of cams A, B upon the shaft h<1>, which revolves once during a set of operations. To effect the discharge at the required times, a tappet upon the wheel h lifts the beltshipper rod l, so that a pin upon the bevel-wheel g<2> strikes against an arm upon the rod and moves it forward. The belt fork upon the rod then throws the extractor mechanism into action, and the material is removed from the drum by the scraper i. As the scraper slide moves to the right, the arm n attached to the rod l falls, and the hooked end engages with a pin upon the belt-shipper rodp. The slide strikes the rod o when travelling towards the drum, and the two belt forks are moved together, which operation reverses the slide. It strikes the end of the belt-shipper rod p, as it reaches the end of its travel, and thus throws the belt on to the loose pulley. To effect a washing of the inner surface of the drum at intervals, after the product has been extracted, the charging- valve A<1> is locked, and the washing-valve B<1> opened for a few seconds. This operation is carried out as follows :-The bar r, Figs. 2 and 3<a>, is raised by a pin upon the wheel q<1>, which revolves once an hour, into such a position that the stop s<1> engages with a stud s upon the rod p, which, in moving forward to put the extractor gear out of action, carries the bar r with it, and locks the charging - valve A. The lever for opening the valve A' is jointed at 2, and maintained straight by a spring. As the bar r is moved to the left, a pin 4 opens the washing-valve B<1>, and the end of the bar locks the valve A' in such a way that the cam A only raises the free end of the lever. When the pin t<1>, acting on the projection t<2> on the wheel h, returns the bar r to its original position, the valve B' closes, and the lever on the valve A<1> straightens out under the action of the spring, and allows the continuation of the charging- operation.