Blowing valve device of a blow-moulding device
AssigneeEugen Seitz AG
InventorsJoachim Schmidt, Mathias Fehlmann
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Abstract
In a method for monitoring a blow-moulding device for producing a hollow body, the blow-moulding device includes at least one process valve unit for feeding a process fluid into a preform of the hollow body under process pressure, wherein the process valve unit includes at least one electrically operated valve. During a blow-moulding process, at least one value of an electric current of the electrically operated valve is detected. The method and the device allow early recognition of an ageing process of the process valves, in particular their pilot valves, and/or the recognition of the status of valve properties.
Claims32
A method for monitoring a blow-moulding device for producing a hollow body, wherein the blow-moulding device has at least one process valve unit for feeding a process fluid into a preform of the hollow body under process pressure, and wherein the process valve unit has at least one electromagnetically actuated valve, wherein a distinctive point of a characteristic of an electric current of the electromagnetically actuated valve is detected during a blowing process, wherein the distinctive point is a reversal point in a counterinduction of the electromagnetically actuated valve, wherein a time of an occurrence of the reversal point is measured, and wherein the time is compared with at least one of a previous measured value and a predefined value, for at least one of detection of an actual malfunction and observation of an ageing process.
A method for monitoring a blow-moulding unit comprising a data processing unit and a plurality of blow-moulding stations for producing a hollow body,
- wherein each blow-moulding station of the plurality of blow-moulding stations has at least one process valve unit with a blowing nozzle on which a preform of the hollow body to be inflated is secured, wherein the process valve unit feeds a process fluid into the preform under process pressure thereby inflating the preform into a final shape of a hollow body, wherein each process valve unit of the plurality of blow-moulding stations has at least one valve,
- and wherein each blow-moulding station of the plurality of blow-moulding stations is associated with at least one sensor,
- wherein the method has at least the following steps:
- detecting at least one first sensor value in each blow-moulding station, resulting in a plurality of detected first sensor values,
- transmitting a plurality of first data values, which are associated with the plurality of at least one detected first sensor value of the plurality of blow-moulding stations, to the data processing unit, wherein each first data value of the plurality of first data value is associated with one of the plurality of blow-moulding stations, whereby the data processing unit receives the first data values of each blow-moulding station of the plurality of blow-moulding stations,
- determining a first statistical average of the transmitted plurality of first data values, which are associated with the plurality of the detected first sensor values, in the data processing unit, thereby considering the first data values of all blow-moulding stations when determining the first statistical average,
- defining the first statistical average, which is determined empirically, as a setpoint, and
- using this empirically determined setpoint as an analytical tool for detecting problems in each blow-moulding station of the plurality of blow-moulding stations.
Dependencies are inferred from the claim text.