Abstract: A mill lining element is disclosed comprising a body of rubber having top and bottom surfaces and longitudinal side edges which extend in the direction of the axis of a mill shell. The body is reinforced by means of a metal plate covering the bottom surface and longitudinally extending metal bars attached to the metal plate adjacent the side edges thereof and extending through the body toward the top surface thereof.

Abstract: A control circuit is disclosed for a sleeve-type pinch valve and which control circuit utilizes an internal vacuum condition in a main supply line in which the valve is disposed to retain the elastomeric sleeve of the valve open. A check valve is provided in the control circuit to prevent backflow of material from the main supply line into the control circuit and pinch valve. A unique check valve disclosed for this purpose includes an expandable tubular diaphragm of elastomeric material normally closed at one end and which opens cylindrically so as to impose no restriction to one-way flow of material therethrough. The one end collapses when flow is interrupted, thus to prevent backflow through the valve.

Abstract: A scraper assembly is pivotally supported for biased engagement with the outer surface of a moving conveyor belt to clean the surface of the belt. The scraper assembly includes a plurality of scraper elements spaced along the length of an elongate carrier which extends transversely of the side edges of the belt. Each scraper element is removably mounted on the carrier and at an inclined angle with respect to the direction of movement of the conveyor belt to displace material clinging to the surface of the belt outwardly towards the edges of the conveyor belt. The scraper element consists of a resilient body with a fixedly vulcanized assembly profile with an outwardly open undercut groove for a bolt. The undercut groove extends at an inclined angle towards the scraping edges of the scraper element. The elongate carriers of the carrier device have a curved carrying surface facing the scraper elements.

Abstract: A scraper assembly is pivotally supported for biased engagement with the outer surface of a moving conveyor belt to clean the belt surface. The scraper assembly includes a plurality of scraper bars spaced along the length of an elongate carrier which is disposed transverse to the side edges of the belt. Each scraper belt is removably mounted on the carrier, and the bars on opposite sides of the center line of the belt are parallel to one another and inclined at an angle with respect to the bent center line. Adjacent ones of the parallel bars have side edges which overlap with respect to an imaginary line intersecting the edges and extending parallel to the bent center line. The scraper bars engage the belt surface, and material clinging to the surface is displaced laterally outwardly toward the opposite sides of the belt.