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Analyze Checkweigher Weighing Sorting Process
Nov 30, 2018

Shanghai Shigan specializes in supplying various checkweighers. Checkweighing scales are mainly used for quality inspection and classification of products on the assembly line. They can also be used for product inspection and missing parts inspection. In order to help everyone better use checkweighers, The following is for everyone to share the weighing scale weighing and sorting process;


Analyze checkweigher weighing sorting process:

The checkweigher completes the measurement of the weight of the product during the delivery process of the product, and compares the measured weight with a preset range, and the controller issues a command to reject the unqualified product or to product of different weight range. Distribution to the designated area. Checkweighing checkweighing has gradually become an indispensable link in modern industrial production, especially in the food and pharmaceutical industries.



Mainly used in the following occasions:

1. Final inspection of product weight

In the final part of the production process, the weight of the product is re-examined, and the unqualified product is removed to ensure that the weight of the manufactured product meets the requirements. This helps to ensure the interests of both the consumer and the manufacturing company. Consumers will not suffer losses due to lack of money, and manufacturers will not be damaged by reputations due to customer complaints or even complaints.


2, feedback control

The automatic checkweigher not only provides the weight signal of the product, but also rejects the unqualified product. It can also output the feedback signal to the packaging filling device according to the difference between the average weight and the nominal weight, and automatically adjust the average weight to match the set weight. , thereby reducing production costs.


3, product missing check

For products that contain small packages in large packages, such as beverage boxes, where large bags contain multiple pouches, the product may be missing due to equipment or personnel factors. Using a checkweigher to check the weight of a large package ensures that there is no missing product in the large package. For example, 24 bottles of beverage per box, the normal weight of each box is a certain, check the weight of each box can be found with or without leakage.


4, sorted by category

Automatic classification of products with uneven weight. For example, manufacturers of split chickens should divide the chicken legs of different sizes into several weight ranges, and then use the check weight to automatically weigh each chicken wing and send the weight signal to the PLC. The PLC drives the corresponding push according to the set range. The board sends the chicken wings to the corresponding box to complete the automatic classification.


The working principle is:

The checkweigher sorting scale consists of a weighing conveyor, a controller, and a feed conveyor. The weighing conveyor completes the collection of the weight signal and sends the weight signal to the controller for processing. The feed conveyor mainly ensures sufficient spacing between products by increasing the speed. The discharge conveyor is used to transport the finished product away from the weighing area.


Weighing preparation

The product enters the feed conveyor, and the speed setting of the feed conveyor is generally determined according to the spacing of the products and the required speed. The purpose is to ensure that only one product can be placed on the weighing platform during the work of the checkweigher.


Weighing process

When the product enters the weighing conveyor, the system identifies the product to be tested from entering the weighing area based on an external signal, such as a photoelectric switch signal, or an internal level signal. Depending on the speed of the weighing conveyor and the length of the conveyor, or based on the level signal, the system can determine when the product leaves the weighing conveyor. From the product entering the weighing platform to leaving the weighing platform, the weighing sensor will detect the signal shown in the figure below, and the controller selects the signal that stabilizes the agricultural area for processing, and the weight of the product can be obtained.


Sorting process

When the controller obtains the weight signal of the product, the system will compare with the preset weight range to sort the products. The sorting type will vary according to the application. There are mainly the following types: reject the defective products. Except for overweight and underweight, respectively, or transport to different places, according to different weight ranges, to different weight categories.

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