How often do the wear parts of a tunnel dryer need to be replaced?

The replacement cycle for wear parts of tunnel dryers should be determined based on a comprehensive assessment of equipment usage intensity, operating conditions, and the specific type of component; typically, these parts are replaced after 1,000 to 5,000 hours of operation or every quarter to year.

Reference Replacement Intervals for Common Wear Parts

Conveyor belt/chain

When used frequently, it is recommended to inspect the component every 2,000–3,000 operating hours; replace it promptly if wear is severe or if elongation or cracks are observed.
If used in high-temperature, high-dust environments, the service life may be reduced to 6–12 months.

Bearing and Roller

Regular lubrication can extend service life; typically, after 3,000–5,000 hours, it is necessary to assess whether replacement is required.
If unusual noises, abnormal temperature rise, or sluggish rotation are detected, the machine should be stopped immediately for inspection.

Heating tube (electric heating tube or infrared tube)

Under normal operating conditions, the service life is approximately 5,000 hours; however, unstable voltage or inadequate heat dissipation may lead to premature aging.
It is recommended to perform a power test every 12 months, and the unit should be replaced if output drops by more than 15%.

Sealing strips (for furnace door and air duct)

Under repeated exposure to high temperatures, it is prone to aging and deformation. It is recommended to inspect and replace any damaged components every 6–8 months to prevent heat leakage.

Filter and Fan Blades

The primary filter should be cleaned every 1–2 weeks and replaced every 3 months.
When dust accumulation on wind turbine blades affects dynamic balance, the blades should be cleaned or replaced, with a maintenance cycle of approximately one year.

Temperature control sensor (thermocouple)

Precision components may drift over prolonged use; we recommend calibration every six months and mandatory replacement within two years to ensure temperature‑control accuracy.

The actual replacement schedule should be flexibly adjusted based on routine inspection records and the equipment’s operating condition; establishing a preventive maintenance plan can effectively prevent unexpected shutdowns.