Showing papers on "Material flow published in 1980"

Method for controlling the flow of coating material

Abstract: A system for adjusting the flow rate of charged particulate coating material between a device for dispensing the coating material and an article, or "target," to be coated by such material to account for factors, such as variations in the profile or contour of the target, or movement of the target transversely to the direction of motion of a conveyor upon which the target is being conveyed past the device or head, which might otherwise cause variations in the thickness of the coating material. The particles migrate in a known manner under the influence of an electrical field toward the target for deposition on the target to coat it at high deposition efficiency. The system continuously monitors the current flow to the target. The system feeds back this current flow related signal to a coating material flow rate servomechanism.

Installation for conveying fine-grained material

Abstract: 1. Apparatus for the continuous delivery of accurately measured quantities of fine material from a storage bin (1) or production arrangement to a consuming arrangement in which at least two pneumatic pressure vessels (3, 4) which are alternately filled and emptied are provided between the storage bin or production arrangement and the consuming arrangement and an outlet valve (12, 12') which can be shut off and an adjustable valve which affects the material flow are arranged in each material discharge pipe (14), characterized in that a) the adjustable valves in the material discharge pipes (e.g. 14) are constructed as control nozzles (15, 15') which affect the material flow pneumatically and are arranged behind the outlet valves (12, 12') - viewed in the direction of movement of the material - and in that b) the control nozzles (15, 15') are connected to an air distributor (18) by means of which a quantity of control air can be supplied corresponding to the selected quantity of material conveyed when the material discharge pipe (14) of the relevant pressure vessel (e.g. 3) is open and a reduced quantity of control air can be supplied when the material discharge pipe of the relevant pressure vessel is closed.

Means for regulating a discontinuous flow of material and for measuring a value proportional to this flow of material and to a second physical quantity

Abstract: The system for controlling a discontinuously flowing flow of material and for measuring a flow of this material and to a further physical variable proportional value, is used in particular for measuring amounts of heat, preferably in central heating systems. For this purpose, it requires at least a self-regulating flow valve (16) for flowing a constant stream of material (2) and with the flow valve (16) connected in series, by a third physical quantity (To) controlled, on-off material flow valve (6). The material flow valve (6) is associated with a servo controller. In this case serves the flow control valve (6) by flowing material as a servo control medium. a thermostat (9), a timer, a pH meter is used to control the servo device. a concentration meter or a level meter. By means of such system, the objective is achieved to measure the simplest possible manner, the product of two interconnected variables, such as material quantity and temperature, as is desirable, for example, in measuring quantities of heat in parts of central heating systems, or for the uniform metering predetermined amounts of materials in predetermined times.

Silo system for mixing stored material

Abstract: A silo for mixing dried and powdery materials such as cement. A number of discharge apertures positioned at different places at the bottom of a mixing silo are connected by conduits to a common receptacle such as an homogenizing silo. A flow control gate is coupled to each discharge aperture to allow material flow to the receptacle to be controlled. Three modes of operation are disclosed: a single flow-mode wherein the flow control gates are opened sequentially one at a time, a dual-flow-same-rate mode wherein pairs of flow control gates are sequentially opened to the same extent, and a dual-flow-different-rate mode wherein pairs of flow control gates are sequentially opened to different extents. A level sensor in the homogenizing silo is connected to a level indicator circuit which emits level indicator signals indicating whether the material in the receptacle is rising or falling, thereby allowing automatic adjustment of the material flow rate into the receptacle up to a predetermined cut-off level. A flow control gate selector circuit connected to a variable timer and to a mode control circuit selects which flow control gates will be opened, and an alternator for every pair of flow control gates is connected to the mode control circuit and to the flow control gate selector circuits to vary the flow rate during different alternator periods when the dual-flow-different-rate mode is selected.