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Preventive Maintenance Guide for Weighing Mixers: Accuracy and Cost Both Guaranteed!

Plaschain 2025-07-27 13:44:58

Weighing Mixer(Gravimetric Blender)

The gravimetric blender efficiently distributes multiple raw materials (virgin material, regrind, additives) into the weighing chamber through valve design and gain-in-weight technology. After weighing, the materials fall into the mixing chamber and are then conveyed to the production machine.

However, under high-load operation, the accuracy of the mixer is highly prone to "deviation"!

To control the costs of expensive materials and additives, it is recommended to inspect the mixer at least once a year and to carry out ongoing preventive maintenance to ensure continued accuracy.

Single Additive Quantitative Feeder

Multi-component mixer gate valve

1Distribution gates and valves

The material distribution doors and valves must open and close freely, quickly, and completely.

Check the sliding door track for wear. Check whether the cylinder positioning adjustment properly closes the sliding door.

The sliding door should be inspected for wear, closure, and responsiveness.

The gate or valve should be closed just enough to block the flow of material, but not further to cause blockage. Depending on the nature of the valve or gate, it is best not to go beyond the far end of the material opening, as this may trap particles.

Check whether the U-shaped pin connecting the cylinder is intact, with no fractures or wear.

Check whether the air pressure is correct, the fittings are secure, and the air hose is damaged or kinked.

2Weighing sensor

Do not remove the load cell from its mounting base; instead, disassemble it (i.e., remove the back cover) to inspect for contaminants that may have entered and accumulated over time.

Blow off all contaminants with compressed air.

Depending on the dustiness of the materials you typically handle, contamination of the load cell may be an ongoing issue for the mixer, and a more refined load cell enclosure from the manufacturer may be required.

Although the free movement of the weight sensor is slight, it is crucial and material buildup cannot be tolerated.

The weighing box must be freely floating to allow the load cell to perform its function.

3Weight gain box

Check whether the discharge valve, baffle, or gate operates smoothly.

The pivot points of these institutions should not wear out.

The valve device should not drip when closed, and it should not drip even when closed to prevent particle leakage.

The valve mechanism should accommodate the static accumulation of particles without interfering with the cessation of material flow.

Check whether the valve is fully closed.

4Weighing bin free movement

Carefully inspect all parts of the weighing box and its supporting frame to ensure that nothing is in contact with any fixed parts of the mixer, and that its weight is fully supported by the load cells, just as designed.

All sides of the weighing box should be left with gaps to prevent inaccurate weight measurements.

Touching the box causes the weight reading on the controller to change. Once the touch is removed, the reading returns to its original value, with an error margin of 1 gram or 0.1 gram.

Usually, according to the display accuracy specified by the manufacturer, only the last digit will drift or change, and the variation will not exceed one digit.

If any interference is detected in the weighing box, it must be repaired.

5Mixing room

Check if the blades are bent or noticeably sharp, as these conditions are caused by material wear during the mixing process. Bent blades may break and severely damage your process screw.

Sharp blades pose safety hazards and can also lead to a gradual decline in mixing performance.

Worn and sharp mixing blades are not only dangerous, but may eventually break and fall into the machine. Moreover, they are also unable to mix materials effectively.

6If the condition of the mixing blade is poor, please replace it.

Stirring blades are usually easy to unlock and/or slide off the drive system for cleaning.

If excessive force is required when disassembling the mixer components, it may indicate severe wear and/or contamination of the components, and/or defects in mechanical parts such as the locking mechanism or interlocking motor shaft ring. This situation should be corrected to prevent blade breakage and potential safety hazards.

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Preventive Maintenance Guide for Weighing Mixers: Accuracy and Cost Both Guaranteed!

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