Fluent material handling – with receiver or receiver coacting mea – Automatic control of flow cutoff or diversion – Level or overflow responsive
Patent
1996-10-22
1998-08-18
Recla, Henry J.
Fluent material handling, with receiver or receiver coacting mea
Automatic control of flow cutoff or diversion
Level or overflow responsive
141 1, 141 67, 141192, 141324, 222 64, 417 43, 73116, 73149, B65B 130, B65B 328, B65B 5706, B65B 5714
Patent
active
057946680
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a procedure for adjusting a filling jet of flow-controlled automatic filling machines used for dosing liquids of various viscosities and densities and filling these with a free-flowing, directed filling jet into vessels.
A procedure is known in which liquids of various viscosities and densities are dosed and filled into containers by volume-controlled automatic fillers. U.S. Pat. No. 4,460,026 shows a liquid measuring method, using a liquid filling device, containing several reservoir elements in certain positions. These reservoir elements are formed from body and neck parts and connect to a container outlet pipe. The procedure according to U.S. Pat. No. 4,460,026 has the disadvantage that dosing and measuring procedures are carried out in a separate part of the device, causing high measuring inaccuracies due to transmission errors. A further, significant disadvantage of flow-controlled automatic fillers, is the time-dependent filling program. The time-dependency of the filling program, i.e. the presetting of the filling time, irrespective of the viscosity and density combined with the changes occurring during the filling process, ad to significant dosing errors, which either have to be corrected by continuous readjustment of the filling, time or by a subsequent complete filling or the vessels. Once the dosing and measuring process is interrupted, a subsequent adjustment of the time program is necessary until the required amount has been set. DD PS 297 123 shows a sensor arrangement in which sensors are arranged on the filling pipe at certain intervals, allowing a measurement of the basic volume. The evaluation of the operating time difference is used for compensating viscosity influences. A disadvantage of the device required for implementing the procedure is that the speed of the medium to be filled can vary considerably in the device, depending on the viscosity and shear rate. In case of the speed of the filling jet emerging from the filling pipe being too high, the filling jet flows past instead of into the vessel opening. In case of the speed being too low, the filling jet is too weak and the medium runs down the filling pipe or the container. A further disadvantage of this arrangement is that the overflow arrangement required for an even dosing is not filled continuously, causing dosing errors. The arrangement of DD PS 297 123 has the further disadvantage of the pump motors being switched off after completing the filling process, causing the medium to adopt a resting position and to change its viscosity. Upon restarting the pump motors and the dosing, considerable adjustments are required to achieve a continuous dosing accuracy.
The invention has the task of providing a procedure according to the characterizing clause of claim 1, achieving an even, clean supply of the medium volume flow through the filling pipe into the containers consisting of vessels.
According to the invention, the task is solved by determining the speed of the liquid jet emerging from the filling pipe as a set value and storing this value in a computer. The actual speed values of a volume flow emerging from a pump are then compared with the stored set values, to adjust the speed of a filling jet emerging from the filling pipe in the region of an external volume sensor. The actual values of the volume flow are determined by speed sensors arranged in front of internal speed sensors but behind the pumps. The output of the respective pump is changed until the value of the stored set value of the filling jet speed corresponds to the measured volume flow speed. Only then is the dosing and filling process via the volume sensors started. The invention is advantageous if a continuous measuring of the flow speed of the volume flow Q emerging from the leveling pump is carried out whilst maintaining a full filling medium tank and an overflowing leveling container, with the consistency of overfilling being regulated by the comparison of the actual volume flow value with a determined set value from which the leveling pu
REFERENCES:
patent: 4460026 (1984-07-01), Hurley
patent: 5316444 (1994-05-01), Wicnienski
Afuema Abfuellmaschinen GmbH Rosslau
Maust Timothy L.
Recla Henry J.
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