Multi Cavity Scanner
Using a scanner to enhance the accuracy of aluminum profile temperature measurements. The scanner has a variety of working modes, which allows the adjustment of the working method for each case.
Scanning range, steps, and timing for the most common case:
-Working distance =1300mm
-Range of the scanning on the table ±200mm.
-The total time of the scanning= 19.4sec.
In the case that a customers would like to shorten scanning time, they can set a shorter scanning area (It’s a straightforward procedure for setting up new virtual right and left limits of scanning).
An alternative solution is setting the working distance to 1500mm. In this case, a single-step length will be longer, and the scanner will need fewer steps for the same angular move.
AST Scanner multicavity measurements
The Process of scanning multi cavity profiles can be seen on the diagram ‘AST scanner multi cavity measurements’.
When the spot measurement diameter is 13mm (for working distance = 1300mm), or 15mm (for working distance=1500mm), the spot will cover parts of a few small profiles and calculate averaged temperature.
During a complete scanning – the scanner will stop at one point, according to our algorithm, one regular profile.
Another option that is suitable for cases where the profile changes its position throughout the process, is “AutoAdjust“.
When activating this option, the scanner will start a procedure to research the profile in case it loses a signal; the pyrometer will count a time (named in user manual “delay 2″) and make movement ±15 Steps Right/Left.
This Time “Delay 2” can be defined by the user based on their particular needs.
Description of the procedure:
The pyrometer will start scanning if a signal is lost during the extrusion process. If the pyrometer finds a hot target, measurements will startat this point.
If a hot target doesn’t found – it will repeat a search in the range of ±15 Steps.
If even the second time there is no signal – the pyrometer moves to mid point of the defined scanning range
and waiting for the new “scan” command.
At the beginning of the extrusion process, the position of the profile is not stable, so scanning at this stage will cause the scanner to lock in the wrong place.
The use of this feature is by closing the circuit of the dry contact, which is carried out from the PLC of the press.
This time “Delay 1” defines the delay between the PLC’s activation and the scan’s start.
The scanner has another delay to avoid the wrong position (named “Delay 1”).
Scanner parameter screen
