This Machine consists of either:
- An indexing starwheel mechanism, or
- A chain drive transfer system for higher speeds.
Both mechanisms transfer aerosol containers from the transport conveyor onto a weighing platform.
The aerosol containers are weighed and classified in accordance with adjustable parameters stored in the PLC / HMI system.
Aerosol containers not within the specified tolerance of an acceptable weight are mechanically separated from passing containers, which are indexed back onto the transport conveyor.
Our checkweighers generally comprise of:
- A transfer mechanism (index starwheel or chain drive)
- A set of changeparts or container guides (depending upon transfer unit)
- One or more weigh stations
- A HMI or Operating Unit
- A stainless steel support frame
An indexing machine has the advantage of weighing to an accuracy of ± 0.1 gram with process speeds of up to 120 containers per minute. The disadvantage, is that a set of changeparts will be necessary to process each different diameter of container.
A chain drive checkweigher has the advantage of process speeds up to 300 containers per minute, and containers from Ø45mm to Ø65mm can be processed without the need for changeparts. The disadvantage, is a slight drop in accuracy.
If a container fails the test, the Machine can:
- Stop, and indicate the failure for operators to remove, before restarting the Machine.
- Push the failure into a customer-provided ‘Bin’ which would be situated underneath the conveyor.
- Push the failure onto a separate ‘Reject Conveyor’.
Both the Bin and Reject conveyor would require periodic inspection to ensure they did not fill to capacity.
Aerosol Checkweigher Machines are typically constructed to comply with ATEX Zone II/3G regulations (classification Zone 2) but can be adapted to wrk in a Zone II 2G environment (classification Zone I).