Checkweigher is a modern equipment to complete the picking, sorting and placing operations in distribution centers, and it is a strong technical guarantee to carry out sorting and distribution operations. It has high sorting capacity and can handle various kinds of goods. It can be integrated with various packaging production lines and conveying systems, and is mainly used for on-line inspection of whether the weight of products is qualified or not, and whether there are missing parts in the package. Or according to the different weights of the items are transported to the corresponding weight range area. Generally consists of control device, sorting device, conveying device and sorting roadway. The role of the control device is to identify, receive and process the sorting signal, according to the requirements of the sorting signal to instruct the sorting device, according to the variety of goods, according to the goods delivered to the location or according to the owner of the category of goods for automatic classification. These sorting requirements can be through different ways, such as bar code scanning, color code scanning, keyboard input, weight detection, voice recognition, height detection and shape recognition, etc., input to the sorting control system, according to the sorting signals to determine a certain kind of goods should enter which sorting channel.

The role of the classification device is based on the control device issued by the sorting instructions, when the goods with the same sorting signal through the device, the device action, so as to change the direction of operation in the conveyor into other conveyors or into the sorting channel. There are many kinds of sorting device, generally there are several kinds of push-out type, floating type, inclined type and branch type, different devices for sorting goods packaging materials, packaging weight, smoothness of the bottom surface of the package, etc. There are not exactly the same requirements.

The main component of the weighing control system is the conveyor belt or conveyor, whose main role is to make the commodities to be sorted through the control device, the classification device, and conveyor on both sides of the device, generally connected to a number of sorting roadway, so that the sorted commodities sliding down the main conveyor (or the main conveyor belt) in order to carry out the subsequent operations.