How much do you know about checkweighers?
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- Ryan
- Issue Time
- Mar 8,2019
Summary
What are the typical applications of dynamic checkweighers?
How does the checkweigher work?
In principle, a distinction must be made between dynamic and static checkweighers: a static scale means that the product must be manually placed on a platform scale or platform scale, and the scale determines the time for it to reach the weight estimate. This can obtain very accurate weighing results, but this process can only be performed on a sample basis.
Dynamic checkweigher, also known as automatic checkweigher or erroneously called "belt weigher" (actually used for weighing bulk materials), is used for the monitoring and classification of goods according to the weight standard, even for example according to FPV (Local finished product packaging regulations), the filling equipment is intervened through the trend controller of the filling equipment. This is a fully automatic weighing (100% control) of all produced products, in which the products are continuously weighed on the conveyor belt, that is, in a dynamic state. In this case, it is not the scale but the production speed that determines the time for the scale to output the weight value.
The dynamic checkweigher is permanently integrated into the production line to check the products in production at a production rate of 20-200/min, even up to 600/min). There are different types of checkweighers: depending on the location of use, they are classified as online or end checkweighers. If the output requirements are high, and the filling and packaging equipment delivers products in parallel on multiple tracks, a multi-track checkweigher can also be used.
The combination unit that combines the checkweigher and the metal detector (critical control point CCP) provides a space-saving solution because they also use the required weighing input belt for metal detection.
A typical dynamic checkweigher usually consists of three conveyor belts arranged in a row. The important input belt takes the product from the customer’s conveyor belt, and the product is accelerated to correctly separate it and transfer it to the next weighing belt as perfectly as possible. .
Intec provides strain gauge technology and high-precision and extremely fast EMF (Electromagnetic Force Compensation) technology. The output or discharge belt removes the products from the weighing belt, and uses our auxiliary products, such as the rejection system to separate the products. However, according to customer requirements, the wrong weight products are usually removed from the production line to make high quality The products enter the next stage of processing. All of these can be recorded locally on the checkweigher or can be recorded using a suitable software tool (such as SPC@Enterprise).
The dynamic checkweigher (with or without integrated metal detector) provides a large amount of important data about the actual performance (and efficiency) of the production line due to its complete record of all measurement results. In order to be able to evaluate these data more easily, Dadi provides various data interfaces and readily available two-way communication evaluation tools