GB247437A - Improvements in and relating to apparatus for treating fish offal for the preparation of fish meal - Google Patents

Abstract

247,437. Phillips, E. B.. and West, W. May 13, 1925. Digesters. - In the preparation of fish meal, fish offal is cooked bv steam in a closed vessel and steam is admitted at the base of the cooking space and directed beneath the charge to effect agitation of the fish offal. As shown in Fig. 1, the cooking- vessel a is closed at the bottom by a door g which is raised into and lowered from its closed position by an hydraulic ram k having a head j with rails i which register with rails i' on which the door g, and the cooked. compressed cake of fish offal resting thereon, is wheeled away to a drying - chamber. Locking-bolts m having racks which are engaged by pinions n, support the door g when it is closed. The offal is compressed, after the cooking is complete, by an hydraulically operated piston e having indicator rods f ending in eyes to which the counterweight cables are attached. The steam for agitating is supplied through downwardly oblique nozzles r controlled by needle valves . Sliding perforated steam nozzles q are adapted to be thrust into the mass at different levels, and steam is supplied at o and exhausted at p. Door-closed charging, observation and charge-levelling openings are provided. The door g is a hollow member having its upper surface perforated and covered with wire gauze. The liquid expressed from the charge by the piston e flows into the hollow portion of the door g and is drained away through a a steam trap g<1>. In order that the steam introduced for agitation through the nozzles r shall not be suppressed by the steam supplied, by the nozzles q, the introduction of steam through the nozzles r is stopped during the agitation, or, alternatively, the steam from the nozzle r is supplied at a pressure higher than that from the nozzles q. Specification 103,493, [ Class 28 (ii), Kitchen and like appliances &c.], is referred to.