Checkweigher is a medium-low speed, high-precision on-line checkweighing equipment, which can be integrated with various packaging production lines and conveyor systems, and is mainly used for on-line checking whether the weight of the product is qualified or not, and whether there is any missing part in the package or the weight of the product is archived.

Online automatic checkweigher has gradually become an indispensable link in modern industrial production, especially in the production process of food and pharmaceutical industries. Online automatic checkweigher completes the measurement of product weight during the conveying process of the product, and compares the measured weight with the pre-set range, and sends out the instruction from the controller to reject the products with unqualified weight or distribute the products with different weight ranges to the designated area.

Checkweigher consists of weighing conveyor, controller and inlet/outlet conveyor. Among them, the weighing conveyor completes the collection of weight signals and sends the weight signals to the controller for processing. The in-feed conveyor ensures adequate spacing between the products by increasing the speed. The outfeed conveyor is used to transport the checked products out of the weighing area.

The working process is as follows:

Weighing preparation: the product enters the infeed conveyor, the speed of the infeed conveyor is set, generally according to the spacing of the products and the required speed to be decided together. The aim is to ensure that only one product can be on the weighing platform during the automatic checkweighing process.

Weighing process: when the product enters the weighing conveyor, the system recognizes that the product to be detected enters the weighing zone according to external signals, such as photoelectric switch signals, or internal level signals. Depending on the speed of the weighing conveyor and the length of the conveyor, or on the level signal, the system can determine the time at which the product leaves the weighing conveyor. From the time the product enters the weighing platform to the time it leaves the weighing platform, the load cell will detect the signal and the controller will select the signal in the stable agricultural area for processing, so that the weight of the product can be obtained.

Sorting process: When the controller gets the weight signal of the product, the system will compare it with the pre-set weight range, and sort the product, the sorting type will be different according to the application, there are mainly the following types: Non-conformity rejection, overweight and underweight are rejected, or conveyed to different places, according to the different weight ranges, and subdivided into different weight categories.

Report Feedback: With the weight signal feedback function, the average weight of a set number of products is usually fed back to the controller of the packaging/filling/canning machine, which will dynamically adjust the dosing volume to make the average weight of the products closer to the target value.

In addition to the feedback function, the automatic checkweigher can also provide a wealth of reporting functions, the number of packages per zone, the total number of packages per zone, the number of qualified, the total number of qualified, the average value, the standard deviation, and the total number and total accumulation.