Home > Information > News

Why Does a Loss-in-Weight Feeder Fluctuate? This Is How Experienced Technicians Maintain and Service It...

Plaschain 2025-08-20 14:17:36

As a type of automated weighing equipment capable of continuous, uninterrupted feeding and discharging, the loss-in-weight feeder is suitable for weighing and batching control of fine materials. It features high precision and high speed, and is widely used in industries such as modified plastics, chemicals, pharmaceuticals, food, and lithium batteries.

However, during the operation of the loss-in-weight feeder, it is likely to encounter fluctuations in feeding.Today, I will introduce this to everyone.Causes of fluctuations in loss-in-weight scales and knowledge on the daily maintenance of loss-in-weight feeders.。

Twin-screw loss-in-weight feeder | Image source: Chuanli Technology

Firstly, the fluctuations in the gravimetric scale are caused by the following reasons:

1. Check whether the feeding motor and the screw operate smoothly by inspecting their vibration and noise levels.

2. Whether the weighing platform and the machine body are in contact with or sticking to surrounding objects.

The feeding screw impeller may have defects, which can affect the uniformity of feeding. We have found that its screw blades sometimes wear out quickly and occasionally even have missing pieces, which affects the stability of screw feeding.

Whether the flexible connections between the loss-in-weight metering bin and the feeding bin, between the loss-in-weight metering bin and the exhaust pipe, and between the discharge port and the collecting hopper are in normal condition.

New type of screw loss-in-weight feeder | Image source: Chuanli Technology

After understanding the causes of fluctuations in the loss-in-weight feeder, let’s also learn about the daily maintenance of the loss-in-weight feeder.

First, during regular use of the equipment to supply materials, attention should be paid to the cleanliness of the equipment.When the surface of the equipment is contaminated with stains or covered with a large amount of dust, it should be cleaned promptly to keep the equipment clean and dry.

In addition, it is necessary to perform regular calibration during the use of the equipment.Some equipment may experience deviations in accuracy due to prolonged use, but timely calibration can prevent errors and ensure the precision of the loss-in-weight scale.

In daily use, staff should also pay attention to whether the moisture condition of the materials meets the standards.When the moisture content of the material is too high, the weight of the material will increase. This not only affects accuracy, but also places a certain burden on the equipment.

New type of liquid weightless feeder | Image source: Chuanli Technology

Here are 15 daily equipment maintenance management suggestions provided by the experienced technician to address these maintenance needs:

Observe the position of the gearbox vernier and regularly add lubricant to the gearbox.

Regularly use an oil gun to add grease to the gearbox.

Regularly inspect the wear condition of the gears inside the gearbox.

Regularly inspect the oil seal at the connection between the gearbox and the output shaft for signs of aging, and it is recommended to replace it regularly (once a year).

Regularly inspect the oil seal of the horizontal agitator in the hopper. It is recommended to replace it regularly (every 1 year).

Regularly inspect the screw blades (for blade-type welded screws) for any deformation. If the deformation is severe, replacement is necessary.

7. Regularly check whether the weighing is accurate (by placing standard weights on the scale) to determine if recalibration is needed or if the weighing sensor is functioning properly.

Regularly check for any foreign objects in the hopper, spherical bucket or U-shaped bucket, discharge port, and screw area.

When using for the first time, pay attention to the rotation direction of the screw. When facing the screw outlet, the screw should rotate clockwise. If the rotation direction is opposite, you can set the inverter parameters to adjust the screw direction.

If the customer changes the material (material characteristics must be the same), the material inside the screw and spherical hopper must be thoroughly cleaned to ensure product quality.

After daily use, it is necessary to promptly clean the scale platform to ensure that there are no foreign objects between the scale housing and the base, and to ensure that no external objects are pulling or exerting force on the loss-in-weight scale. Ensure that the cable is properly bundled, and that no external force is applied to the loss-in-weight scale.

Before any transportation or relocation of the 12 loss-in-weight feeder, the protective blocks between the cover shell under the weighing body and the base must be installed and secured to prevent external forces from damaging the weighing sensor during handling and transportation. The protective blocks can only be removed after the loss-in-weight feeder is properly positioned and installed.

The loss-in-weight feeder should be installed away from sources of vibration, and the base must be firm and level.

The control system requires good weak current grounding, which must be strictly separated from the strong current grounding, and the grounding resistance must be less than 1 ohm.

15. If an unexplained fault occurs during use, record the fault phenomenon, cut off the power supply, and carry out repairs with electricians and fitters present, ensuring the safety of personnel and equipment.

【Copyright and Disclaimer】The above information is collected and organized by PlastMatch. The copyright belongs to the original author. This article is reprinted for the purpose of providing more information, and it does not imply that PlastMatch endorses the views expressed in the article or guarantees its accuracy. If there are any errors in the source attribution or if your legitimate rights have been infringed, please contact us, and we will promptly correct or remove the content. If other media, websites, or individuals use the aforementioned content, they must clearly indicate the original source and origin of the work and assume legal responsibility on their own.

Why Does a Loss-in-Weight Feeder Fluctuate? This Is How Experienced Technicians Maintain and Service It...

Most Popular