Fluent material handling – with receiver or receiver coacting mea – With testing or weighing receiver content
Patent
1996-09-24
1998-10-13
Jacyna, J. Casimer
Fluent material handling, with receiver or receiver coacting mea
With testing or weighing receiver content
141153, 141188, B65B 328, B65B 334, G01G 1500
Patent
active
058198164
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention takes as its departure point a process for metering and introducing a liquid into packaging containers as set forth hereinafter. In a process of this type which has been disclosed in EP 0 430 897 A1, the packaging containers to be filled are conveyed to a liquid-introducing device by means of a conveying device, both the tare weight and the gross weight of the packaging containers being registered in each case by one weighing device upstream and downstream of the liquid-introducing device and being fed to a control device as an input variable. The liquid-introducing device is connected via a distributor to a supply container which stores the liquid and is subjected to a constant, regulated gas pressure. Arranged in the supply container are a sensor for registering the filling level, a sensor for registering the liquid temperature, and a sensor for registering the gas pressure, these likewise being connected to the control device. The control device determines, from the input values of the sensors and of the weighing devices, an activation time for the metering valves of the liquid-introducing device for a specific desired filling quantity. In this arrangement, a hydrostatic pressure is added to the gas pressure measured, which hydrostatic pressure, for its part, is calculated from the known density and the measured temperature of the liquid and the filling level in the supply container. At the same time, by virtue of the liquid temperature being registered, the viscosity of said liquid can be determined and the activation time of the metering valves can be corrected if appropriate. The disadvantage with the apparatus operating by this process is that all the sensors are arranged within the supply container. Upon changing the supply container, which is usually arranged exchangeably in order to use various product batches, a large amount of work is thus necessary in order to refit the sensors. Moreover, registering the liquid temperature in the supply container is problematical since the temperature, and thus also the viscosity of the liquid, can change from the supply container to the metering valves. Furthermore, in order to register the overall pressure of the liquid in the metering valves, a filling-level sensor is required in addition to a gas pressure sensor. The known apparatus is therefore of a relatively complex construction.
It is also known from the abovementioned document to dispense with the filling-level sensor when quantities to be removed from the supply container are relatively small in relation to the overall contents thereof. However, this restricts the possible applications as regards the quantities of liquid which can be removed or it produces metering inaccuracies.
U.S. Pat. No. 4,570,822 further discloses a computer-controlled metering apparatus in the case of which each metering valve is assigned its own pressure sensor in order to register the overall pressure. Furthermore, each metering valve is activated separately by a computer.
The disadvantage with this known metering apparatus is that, as a result of the large number of pressure sensors, it is of a complex construction and does not make provision for taking account of temperature.
ADVANTAGES OF THE INVENTION
In contrast, the process according to the invention for metering and introducing a liquid into packaging containers, has the advantage that, by virtue of the arrangement of the pressure sensor and, if appropriate, the temperature sensor in the immediate vicinity of the metering valves, the parameters essential for metering are registered precisely, with the result that the weight of the quantities introduced is extremely precise. Furthermore, an essential advantage is that, when a product container is changed, the sensors do not have to be exchanged or modified.
If the temperature of the liquid at the time of liquid introduction is known, then the temperature sensor can be dispensed with. Consequently, the construction of the apparatus is further simplified.
Further advantages and advantageous fu
REFERENCES:
patent: 4417610 (1983-11-01), Waldstrom et al.
patent: 5148841 (1992-09-01), Graffin
patent: 5156193 (1992-10-01), Baraffato et al.
Greigg Edwin E.
Greigg Ronald E.
Jacyna J. Casimer
Robert & Bosch GmbH
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