Does the metering device of the granule filling machine need to be calibrated regularly?

The measuring device of the granule filling machine must be calibrated regularly, which is the core measure to ensure filling accuracy and product quality. Here are the key points:

Precision degradation caused by mechanical wear and tear
The piston, measuring cup, or sensor of the measuring device will continue to rub during use, and metal components (such as stainless steel piston barrels) will gradually wear out. For example, filling abrasive particles such as coarse salt and tablet debris may result in a gap deviation of 0.1-0.3 millimeters after several months, causing fluctuations in single filling volume beyond the allowable range.

Sealing deformation causes material leakage
The rubber sealing ring of the metering valve will undergo permanent deformation due to particle compression and temperature changes. If a certain milk powder factory fails to calibrate in a timely manner, the slight deformation of the sealing ring leads to a leakage of 2-3 grams of powder per can, resulting in a daily loss of tens of kilograms of raw materials. Regular calibration can detect seal failure and replace it in a timely manner.

Adaptation requirements for changes in material characteristics
When the same device processes different batches of particles, there are differences in material density and flowability. If the baking factory fills damp and clumped sugar particles in summer, the measuring stroke needs to be lowered; Dry particles in winter require additional travel. Calibration can quickly match changes in physical properties, avoiding batch overweight or underweight.

Avoiding the accumulation of systematic errors
The transmission gear clearance and servo motor feedback deviation of the filling machine will accumulate errors over time. A case study of a pharmaceutical factory shows that after continuous operation for three months, the overall deviation of the measuring system reached 1.8%. Through weekly calibration, the error was controlled within 0.5% to avoid the risk of million level drug recalls.

Core details of calibration operation
Reference material selection: Use actual filled particles instead of standard weights (such as the "physical calibration method" mentioned on webpage 30) to eliminate the effects of material static electricity and fluffiness;
Dynamic simulation calibration: Tested at the operating speed of the production line (such as speed calibration required for rotary filling machines), the static calibration result can deviate from the actual value by up to 20%;
Three dimensional accuracy verification: In addition to weight detection, measure the height of the material level with a caliper (such as controlling the filling depth for capsule filling) to ensure consistency in filling.