Showing papers on "Material flow published in 1982"

Furnace charging installation

Abstract: The delivery of charge material to the hearth of a pressurized blast furnace under the influence of gravity is accomplished without the necessity of changing the direction of material flow at a point exterior of the furnace The rate of flow of the charge material, which moves in a vertical stream, is controlled by a metering device including a pair of overlapping register elements which define a variable size aperture which remains generally symmetrical with respect to the stream axis

Measuring use of heat or the like at individual zones supplied from one source

Abstract: The apparatus for controlling a discontinuously flowing material flow and for measuring a value proportional to this material flow and a further physical magnitude serves particularly for measurement of heat quantities, preferably in central heating apparatus. For this it utilizes at least a self-regulating flow valve (16) for allowing flow-through of a constant material stream (2) and an open/closed material through-flow valve (6) connected in series with the flow valve (16) and controlled by a third physical magnitude (T o ). A servo control device is associated with the material through-flow valve (6). In this the material flowing through the through-flow valve (6) serves as a servo control medium. A thermostat (9), a time register, a pH gage, a concentration gage or a level gage serves for control of the servo device. By means of an apparatus of this type there is solved the problem of measuring in the simplest possible manner the product of two magnitudes that are connected with one another, for example, material quantity and temperature, as this is desirable, for example, for measurement of heat quantities in portions of central heating systems or for simultaneously metering out predetermined material quantities at predetermined times.

On the structure and logic of typical material flow systems

Abstract: A queueing network technique (Solberg's CAN-Q) and a flow control simulator (SINDECS) are applied to investigate general, fundamental performance properties of material flow systems (MFS). The effects of a system's structure and flow logic on performance are compared for three typical flow systems: transfer line, recirculating conveyor loop, and job shop. The concepts of Most Economical MFS for a given performance level, Iso-Performance MTS combinations, and Overall MFS Configuration Measures are introduced.

Testing device for vortex flow meter

Abstract: PURPOSE:To omit an oscilloscope, miniaturize the entitled testing device and reduce the load of the operator by attaching an oscillation variation monitoring circuit to monitor the variation of oscillation of vortex signals. CONSTITUTION:An air filter 2 is attached to the upper stream of a vortex flow meter 1 to be tested which is arranged in the flow passage. Plural voice speed nozzles 4 with different flow rates are fitted to the standard flow rate part 3 which can obtain accurate and stated flow rate and these nozzles can be selected according to the requirement. A vacuum pump 5 is arranged on the lower stream side of the same flow passage as that of the air filter 2, the vortex flow meter 1 to be tested and the standard flow rate part 3 to make a flow material flow into the flow passage. When receiving a vortex signal, a testing part 8 measures and checks the flow rate. An oscillation variation monitoring part 9 monitors whether the oscillation of the vortex signal exceeds a required set point or not during the test time.

An experimental investigation of material handling in flexible manufacturing using computer simulation

Abstract: An important design issue for the automated factory of the future is the material handling function. Flexible manufacturing facilities demand an equally flexible material handling system. Material handling can have a significant impact on work-in-process inventory, and capacity requirements as well as material flow considerations. Since flexible manufacturing facilities are typically costly to design, install and maintain, direct experimentation is not feasible and analytical models give only an approximate solution at best. Due to the magnitude of the economics, even small errors of approximation can be significant.Clearly, computer simulation can be a very effective design and analysis tool for the investigation of material handling processes. This paper presents the results of an experimental investigation of alternative control procedures for dispatching driverless (automated) vehicles to transport "move orders" between manufacturing cells or "islands". Dispatching methodologies examined include first-come-first-served, a dynamic adaptation of the assignment problem and a dynamic programming approach which seeks an optimal tour over the next two, three, etc. moves. Both the value of such optimum-seeking dispatching rules and the appropriateness of computer simulation as an effective design tool are discussed.

Procedure for controlling the density distribution of wood chips and device therefor

Abstract: A chip material container arrangement is provided for storage of material to be spread in the production of particle and/or fiber boards. The container arrangement is equipped with several discharge rollers arranged one above the other, a base belt and feeder devices. With a discharge opening extending over the width of the container, the density distribution of the material to be spread is controlled by removing appropriately dimensioned material quantities from individual partial streams which partial streams are later combined in the area of the discharge opening to form a total material flow.

Mill discharge quantity control device - uses control of ground material carrying air stream control in dependence on measured material flow

Abstract: The material is ground in a ball mill (1), which is supplied with fresh air (mFr). The ground material leaves the ball mill (1) via a discharge housing (2) and the material flow (mA) is monitored by a flow measuring instrument (3). A fan (4) takes in air via filter (5), cyclone (6) and discharge housing (2) and the air flow quantity (VL) taken through the ball mill (1) is controlled by a throttling damper (8) in relation to the value measured by an instrument (3) and evaluated by a converter (7) controlling the damper (8) using a motor. When damp material is handled, the temp. of air taken in for drying purposes can be increased with simultaneous decrease of the air quantity.