Fluent material handling – with receiver or receiver coacting mea – With testing or weighing receiver content
Patent
1983-11-15
1986-08-12
Marcus, Stephen
Fluent material handling, with receiver or receiver coacting mea
With testing or weighing receiver content
141165, 141168, 141 85, 198625, 198662, 177 52, B65B 132, B65B 5710
Patent
active
046050477
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for the metered filling of bulk materials, especially liquids, into receptacles; it has a filling station including the metering device for the bulk material, a conveying device moving the receptacles through the filling station, and a weighing device for the bulk materials which controls the metering device.
BACKGROUND ART
A filling device of this type has become known from the German patent application No. 29 51 665. On this system the conveying device moves each of the receptacles successively past several dosing units each of which meters a part of the bulk material to be filled in and after an intermediate filling into the weighing dish of a weighing unit, controlling the dosing unit, it transfers the material to the receptacle. Each of the dosing units is controlled by a timing circuit which determines the opening time for the flow of bulk material. The weighing unit itself controls the timing circuit of the pertaining dosing unit dependent on the specified tolerance limits. A signal memory adds for each of the receptacles the quantities of bulk material filled by the dosing units into the receptacle.
The expense of construction of the well-known system is relatively high. Several complete weighing and dosing units are necessary in order to be able to observe sufficiently narrow tolerances of the quantity of bulk material filled in. The tolerances are determined by the tolerance limits of the dosing unit, which is last in the charging course, and are so high that they are insufficient for many cases of application, especially for the filling of liquids. By means of the well-known system, merely solid bulk materials are therefore filled.
Furthermore there has been known the volumetric dosing and filling of liquids by means of piston pumps and the like. It is true, the well-known liquid filling systems are able to observe filling tolerances very accurately but they are relatively expensive with respect to construction. Beyond that, the dosing pumps are difficult to clean which causes problems especially in connection with the filling of sterile liquids. Moreover, the abrasion dust of the mechanically moved parts of the dosing pump increases the number of foreign particles in the liquid to be filled.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide a structurally simple device by means of which bulk material and especially liquids can be filled into receptacles at narrow tolerances.
As defined in the invention, this problem is solved by the fact that during the charging of each receptacle in the filling station with bulk material the weighing device monitors the weight of that receptacle and blocks the flow of bulk material of the dosing device when the weight of that receptacle exceeds a predetermined value. In contrast to the well-known filling device, the weighing device monitors the quantity of bulk material actually filled into the receptacle. Dosing errors, as they can occur in connection with the well-known filling device during the refilling of the quantity of bulk material, which was put by the dosing unit into the weighing dish, into the receptacle are avoided. The receptacle is filled in one filling operation, and therefore it does not have to pass through several differently dimensioned dosing units. The cost of construction is low, yet the device affords great accuracy in measuring.
Special advantages result in connection with the filling of liquids. The device has few moving parts--and no moving parts if hose squeezing valves are used, which are in contact with the liquid to be filled so that no abrasion dust or other particles can be carried into the liquid. In contrast to conventional liquid filling devices, the parts coming into contact with the liquids can be cleaned easily. Without changing parts, for instance, pump cylinders and the like, a large filling range can be covered. Since dosing pumps are not used, product losses are comparatively small, a fact which is especially advantageous in
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Bausch Wilhelm L.
Bullinger Siegfried
Busch Walter
Harlass Harald
Strobel Rolf
Bausch & Strobel Maschinenfabrik GmbH & Co.
Cusick Ernest G.
Marcus Stephen
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