The Mechanical Handling and Storing of Material

PUSH-TROUGH CONVEYORS 73 The push-plates are 18 to 30 in. apart, the stroke is equal to the pitch of the blades, and the speed 50 to 60 strokes per minute. The capacity is the same as for push-plate conveyors of the same dimensions, etc. Push-trough conveyors have a restricted use, as the blades will not readily engage with large material. They are principally used in foundries to convey foundry sand. Figs. 94, 95, and 96. Push-Trough Conveyor for Foundry Sand. They will also handle all other fine materials, as well as ashes and small coal to the size of nuts, ordinary sand, gravel, etc. Figs. 94, 95, and 96 illustrate a similar conveyor, several of which are at work on foundry sand in a large German foundry, and made by Vereinigte Schmirgel und Maschinen- Fabriken, Hanover-Hainholz.1 The description of the previous illustration will make a Figs. 97 and 98. Showing Motor and Method of Reducing Speed. repetition unnecessary, and it may suffice to say that this conveyor is nearly 100 ft. long. Figs. 97 and 98 show the motor and the mode of speed reduction. The principal feature of the construction is the curved form of the blades, and the differential roller supports for the reciprocating device. For the latter it is claimed that the power con- sumption is reduced. It has been found that the wear is greatly reduced by lining the trough with wood, which material is less affected by the foundry sand than iron. 1 Zeitschrift des Vereines deutcher Ingenieure, 1909, page 1225.