Dispensing – Automatic control – Constant weight – volume or pressure control by output
Patent
1991-04-25
1992-11-10
Kashnikow, Andres
Dispensing
Automatic control
Constant weight, volume or pressure control by output
222 63, 222 77, 222504, 222559, B29C 4710, B29C 4792, G01G 1318
Patent
active
051617145
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a feed device for bulk material, comprising a more particularly funnel-shaped storage tank, which is borne freely movable by measuring members as a weighing tank of a mass throughput weighing system and is disposed with its outlet over a conveyor system for the removal of the bulk material.
In a known feed device used for extruders (German Patent Specification 37 05 963 C1) a transition member having an inclined surface is provided between the tapering bottom part of the storage tank and its tubular vertical outlet. On its side facing the outlet the bulk material moving from the storage tank into the transition member breaks off, in this way arriving in the vertical outlet. The result is an uncoupling of the mass flow, which otherwise might lead to measuring errors in weighing the mass throughput. This kind of uncoupling of the mass flow is adequate for the majority of applications. However, it has been found in practice that the asymmetrical discharge of the bulk material is not optimum, since the result is non-symmetrical loadings on the mass throughput weighing system, which as a rule comprises a number of measuring members. There is also the fact that the transition member with the inclined surface which is rigidly disposed on the tank does not allow the metering of the bulk material. If metering is required, so as to underfeed the extruder with bulk material to a varying extent, additional metering devices must be provided, the result being that the technical device is fairly expensive.
Another disadvantage of the prior art device is that bulk materials of low flowability, more particularly finely pulverulent bulk material, may due to several diversions become dammed up during discharge. Attempts have been made to obviate these difficulties by free cross-sections of different sizes in the outlet and in the transition member, but this meant that different transition members and outlets had to be available, in dependence on the bulk material to be processed.
It is an object of the invention to provide a feed device for bulk material which enables the mass throughput to be better determined gravimetrically than previously and also metered, substantially independently of the pourability and flowability of the bulk material.
This problem is solved according to the invention in a feed device of the kind specified by the feature that disposed below the outlet is a conical or pyramidal damming and supporting member for the bulk material which is borne by the storage tank and whose conical or pyramidal apex faces the outlet, its conical or pyramidal surfaces cooperating with the edge of the outlet to form a gap on all sides. Preferably the maximum diameter of the conical or pyramidal damming and supporting member is at least as large as the diameter of the outlet.
Due to the conical or pyramidal shape of the damming and supporting member, in the feed device according to the invention the bulk material is distributed uniformly and free from back-up on all sides. Because of the elimination of the prior art multiple deviation of the bulk material on its way to the outlet, there are no pockets in which bulk material can become stuck, such as were hitherto frequently the cause of undesirable backing-up, more particularly in the case of bulk material of low flowability. B changing the width of the gap on all sides of the damming and supporting member, while maintaining the pouring angle on the damming and supporting member, the bulk material to be discharged can be metered without adverse effect on the uncoupling of the mass flow. No additional metering devices are required which affect discharge, as in the prior art.
It is true that conical closure members for tanks containing bulk material have been known for decades (German Patent Specification 342 197), but those closure members have an exclusively opening and closing function. There is no disclosure of any uncoupling of a mass flow, as is important in the use of mass throughput weighing systems.
A required metering of the quantity of bu
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Neumann Ulrich
Riediger Roland
DeRosa Kenneth
Inoex Innovationen und Ausrustungen fur die Extrusionstechnik
Kashnikow Andres
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