Fluent material handling – with receiver or receiver coacting mea – With means to move supply means and/or receiver to – from or... – Movably mounted supply
Patent
1995-07-27
1997-06-24
Recla, Henry J.
Fluent material handling, with receiver or receiver coacting mea
With means to move supply means and/or receiver to, from or...
Movably mounted supply
141 12, 141 71, 141232, 141 67, 366189, 366192, B65B 104
Patent
active
056410093
DESCRIPTION:
BRIEF SUMMARY
This invention is concerned with charging cavities with particulate material.
In various industries, the requirement exists to charge cavities with particulate material which ideally fills the cavity to a constant depth. The provision of such a level pile is not easy to achieve because particulate material naturally forms an uneven pile if poured into a cavity. This can be alleviated to some extent by complex pouring techniques but this is slow and may be impractical if the cavity is in a confined space, e.g. between the platens of a press. The possibility also exists of over-filling the cavity and skimming off the excess material. This possibility is, however, wasteful of material and may not be possible in a confined space. This solution is also not available where successive layers of particulate material are deposited on top of one another. Where there is more than one type of particle in a charge, it is also difficult to maintain uniformity of distribution during charging with present charging techniques.
It is an object of the present invention to provide an improved method of charging a cavity with a particulate material.
The invention provides a method of charging a cavity with particulate material, the method comprising positioning a predetermined quantity of particulate material in a box which has substantially the same horizontal cross-sectional shape as the cavity, the box being closed at the bottom by at least one door on which the particulate material rests, moving the box to and fro horizontally a plurality of times with movements arranged so that the energy imparted to the material as a result of the movements is progressively reduced during the movements, and removing said door from the box sufficiently rapidly that the particulate material falls substantially as a unit into the cavity.
In a method according to the invention, the to and fro horizontal motion causes the particulate material to form a substantially level pile in the box, i.e. one of constant depth, and this pile is found to fall substantially intact into the cavity. The relatively large quantity of energy applied to the material in the initial movements of the to and fro movement causes larger particles in the material to be distributed across the box while the relatively smaller quantity of energy applied in the later movements does not significantly move said larger particles but distributes any smaller particles. By reducing the energy progressively, the correct amount of energy to distribute each particle size present, is applied at some time during the movements and once distributed said particles are not significantly moved thereafter. The to and fro motion can be performed in the confined space between the platens of a press, and the method can be used to deposit successive layers, each of uniform depth, on top of one another. Furthermore, the to and fro motion is found to achieve a uniform distribution of particles of different types within a charge or layer which is present in the material in the cavity, unlike some known charging methods which create local concentrations of particles of one type. The progressive reduction in energy can be achieved by decreasing the amplitude of the to and fro movements. Alternatively, or additionally, the duration of the movements may be increased.
At least some of the to and fro movements may be separated by pauses, thereby giving the material more settling time before it is moved again. The pauses may last up to one quarter of the duration of the movement preceding it.
The door, or several doors arranged to be moved simultaneously, have to close the entire bottom of the box and be removed sufficiently rapidly that substantially none of the material can fall before the rest. A removal time of about 0.2 seconds has been found to be suitable. The door or doors may be removed by horizontal movement.
The to and fro movements of the box are preferably linear but may alternatively be arcuate, circular or ellipsoidal. In some cases, it may be advantageous to superimpose simultaneous or s
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Patent Abstracts of Japan, vol. 4, No. 72 (M-13) (554) 27 May 1980 "Powder Supplying Method and Powder Supplying Device For Powder Forming Machine" Inventor: Riken K.K.
Dyson Mark Philip
Marks Kevin Trevor
Sutton Andrew David
Turner Ronald Henry
Douglas Steven O.
GB Tools & Components Exports Ltd.
Recla Henry J.
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