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Multihead weigher also known as combination scales, multi-head weighers use a number of different weigh heads to generate precise measurements of products by calculating the weight in each weigh head. Each Weigh head has its own precision load cell.

 

The process begins when product is fed into the top of the multihead weigher, where a dispersal system, normally a vibrating  or rotating top cone,  distributes the product into a series of linear feed plates. This top cone is normally equipped with a load cell which controls the feed of product to the multihead weigher. A series of curtains are normally placed around the linear feeders to ensure an even quantity of product is available for distribution to the feed hoppers.

 

 

 

The linear feed plates vibrate individually. The amplitude and duration of vibration can be varied to increase or decrease the vibration depending on the charachteristics of the product. For sticky products a lot of vibraton will be required wheras for free flowing products a minimal amount of vibration will be required to get the product moving.  Each linear feeder will deliver some product into a feed hopper.

 

For example in a 10 head Multihead Weigher there will be 10 Linear feeders delivering products to 10 Feed hoppers. After each delivery to the feed hoppers the linear feeders will stop vibrating and wait until the Feed hoppers have emptied their contents into the Weigh hoppers before starting again. Each Weigh Hopper is equipped with a highly accurate load cell. This load cell will calculate the weight checking machine of product in the weigh hopper.

 

The processor in the Multihead Weigher will then calculate the best combination of available weights required to achieve the desired target weight.