Dispensing – Automatic control – Motor control
Patent
1979-01-11
1981-06-30
Tollberg, Stanley H.
Dispensing
Automatic control
Motor control
222 52, 222134, 222135, 137 99, 364479, B67D 508, G06F 1546
Patent
active
042758220
ABSTRACT:
The instant invention relates to an apparatus for metering at least two flowable reaction components, such as polyurethane-forming components, in a predetermined ratio into a mixing chamber. The apparatus broadly comprises a metering unit for each component, which is made up of a piston and cylinder, a feed pipe leading from a storage container into the cylinder, a delivery pipe leading from the cylinder to the mixing chamber and optionally a return pipe, and a drive unit. Each drive unit is in the form of an electro-hydraulic linear amplifier which comprises a stepping motor for a control mechanism which is coupled to a hydraulic piston and cylinder, wherein the drive unit is capable of driving the metering piston. Control electronics are provided for controlling the metering units. The controls comprise at least one adjustable control frequency generator for generating signals to be fed to the electro-hydraulic linear amplifiers to control the movements of the metering pistons. A first signal path is provided for conducting signals to at least one of the electro-hydraulic linear amplifiers from a control frequency generator and a second signal path is provided for conducting the control frequency generator signals to all other electro-hydraulic linear amplifiers via an adjustable frequency reducer.
REFERENCES:
patent: 3604903 (1971-09-01), Hill et al.
patent: 3667651 (1972-06-01), Shapiro
patent: 3798431 (1974-03-01), Schulkind et al.
patent: 3967634 (1976-07-01), Scherer et al.
patent: 4008829 (1977-02-01), Chandra et al.
patent: 4084246 (1978-04-01), Schwartz
Boden Heinrich
Juffa Richard
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Tollberg Stanley H.
Wacyra Edward M.
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