What are the specific effects of humidity on the operation of ZQ650-31.5-5 gear reducer?

Humidity has a significant impact on the operation of the ZQ650-31.5-5 gear reducer. In a high-humidity environment (relative humidity >80%), water vapor intrusion is the core cause of lubrication failure, metal corrosion, and reduced sealing performance. It will directly cause gear wear, bearing jamming, oil emulsification and other failures. In severe cases, it can cause sudden shutdown of the equipment or shorten its life by more than 50%. Considering that this model is often used in heavy-duty working conditions, a detailed analysis needs to be carried out from the four dimensions of lubrication system, transmission components, sealing structure and electrical accessories.

1. Lubrication system: oil emulsification and lubrication failure are the primary risks

In a high-humidity environment, water vapor enters the box through the breathable cap and sealing gap, mixes with lubricating oil, and triggers a series of chain reactions:

• ‌Lubricating oil emulsification and deterioration‌ : Moisture and gear oil form a milky white emulsion, which destroys the integrity of the oil film, causing the gears and bearings to be in a state of boundary lubrication or even dry friction, and the tooth surfaces are prone to pitting and peeling.

• ‌Grease hardening and caking‌ : If the bearing is lubricated with grease, the intrusion of water vapor will cause the lithium-based grease to absorb water and harden, losing its lubrication and buffering functions, causing increased friction resistance and abnormal temperature rise during operation.

• ‌The acid value of the oil increases‌ : Water reacts with additives to generate acidic substances, which corrode the surfaces of gears and bearings, and accelerates corrosion of the inner wall of the box. Rust particles further contaminate the oil, forming a vicious cycle of 'wear-contamination-rewear'.

2. Transmission components: corrosion leads to reduced load-bearing capacity and abnormal operation

ZQ650 is a medium and large cylindrical gear reducer. Its gears, shaft systems and bearings are extremely prone to electrochemical corrosion in humid environments:

• ‌Gear tooth surface corrosion‌ : Uncoated parts such as tooth roots and journals absorb water vapor to form red rust or black rust. The rust layer falls off during operation, causing pitting and peeling, reducing the tooth surface contact strength, and the load-bearing capacity decreases by more than 30%.

• ‌Bearing rusted and stuck‌ : After the GCr15 bearing steel raceway or steel balls are corroded, the rotation resistance increases and a 'sanding' abnormal sound occurs. In severe cases, the cage breaks, causing the shaft system to get stuck.

• ‌Corrosion of shafting and key connections‌ : After the input/output shaft, splines, and flat keys are corroded, the fitting gap increases, causing circumferential slippage or axial movement, causing impact loads when transmitting torque, and even causing key breakage.

3. Sealing and fastening structure: protection failure causes secondary faults

Seal aging and fastener corrosion are hidden dangers in high-humidity environments:

• ‌Seal aging and failure‌ : Rubber oil seals and O-rings are easy to harden and deform in hot and humid environments, losing their sealing effect, resulting in oil leakage or continuous moisture intrusion.

• ‌Corrosion and loosening of fasteners‌ : After the anchor bolts and box joint surface bolts are corroded, they are not only difficult to disassemble, but also cause the vibration of the reducer to intensify due to looseness, amplify the coaxiality deviation, and affect the gear meshing accuracy.

• ‌Joint surface leakage‌ : After the sealant on the box joint surface fails, moisture and impurities invade, exacerbating internal pollution.