Weighing and sorting machine, also known as weight removal machine or weight sorting machine.

It is a high-speed and high-precision online inspection and sorting equipment that can be integrated with various packaging production lines and conveyor systems. It is mainly used for online detection of whether the product weight is qualified and whether there are missing components in the packaging. Or transport the items to the corresponding weight range area according to their different weights.
After design improvements, the weighing and sorting machine has evolved from simple weight detection to weight sorting, and the sorting level has also developed from the first level in the field of weight exclusion and weight sorting to over 20 levels currently. Commonly used for weight and size sorting in seafood, traditional Chinese medicine, meat and other fields.
Weighing and sorting machines have gradually become an essential part of modern industrial production, especially in the food and pharmaceutical industries. The weighing and sorting machine completes the measurement of product weight during the transportation process, compares the measured weight with the pre-set range, and sends instructions from the controller to reject products with unqualified weight or distribute products with different weight ranges to the area.

Mainly used in the following situations:
1. Final inspection of product weight
At the final stage of product production, the weight of the product is rechecked and any non-conforming products are removed to ensure that the weight of the products leaving the factory meets the requirements. This is beneficial for ensuring the interests of both consumers and production enterprises. Consumers will not suffer losses due to shortages, and manufacturers will not suffer reputational damage due to customer complaints or even grievances.
2. Feedback control
In addition to providing weight signals for products, the weighing and sorting machine can also output feedback signals to the packaging and filling equipment based on the difference between the average weight and the nominal weight, automatically adjusting the average weight to match the set weight, thereby reducing production costs. For example, if each package of milk powder weighs 450 grams and no weighing scale is used, the average weight of the package is 453 grams to ensure that the product weight meets the standard; After using automatic feedback control for weight inspection, the average weight can reach 450 grams. Calculated based on producing 10000 packs per day, 30000 grams can be saved per day, saving 10.8 tons per year. Calculated at a market average price of 15 yuan per pack for infant formula, 360000 yuan can be saved per year.
3. Product missing inspection
For products with small packaging in large packaging, such as beverage boxes or large bags containing multiple small bags, product shortages may occur due to equipment or personnel factors. Using a weighing scale to inspect the weight of large packaging can ensure that there are no missing products inside the packaging. For example, if each box contains 24 bottles of beverages and the normal weight of each box is constant, checking the weight of each box can reveal any missing items.
4. Classify by category
Automatically classify products with uneven weight. For example, if a chicken manufacturer wants to divide chicken legs of different sizes into several weight ranges, they can use weight inspection to automatically weigh each chicken wing and send the weight signal to the PLC. The PLC drives the corresponding push plate to deliver the chicken wings to the corresponding box according to the set range, thus achieving the purpose of automatic classification.

The above applications are some conventional applications for weight inspection, and weighing and sorting machines can also be applied to many industries such as military and newspaper industries. The United States once used a weighing scale to check the weight of each bullet, as the weight of the bullet can affect its flight trajectory. In addition, the weighing and sorting machine can also be used for counting when distributing newspapers. The quantity of newspapers may be inaccurate during printing and bundling, and the total quantity distributed to various regions may be inaccurate. Using a weighing scale for counting is fast and accurate, which can save a lot of manpower.