How to Maintain and Service the double shaft shredder blades

How to Maintain and Service the double shaft shredder blades：

Daily Operation and Startup/Shutdown Procedures

Before Startup: Ensure the cavity is free of foreign objects, check that the blade is securely fastened and well-lubricated, and confirm that the safety protection is in good condition. For new machines, immediately retighten the blade bolts 1 hour after startup.

During operation, ensure materials are fed evenly. Avoid overloading. Do not add hard items such as metal. Monitor for unusual noises. Watch the current and output. Stop the operation immediately if you detect any abnormalities.

After stopping, thoroughly clean leftover materials using a brush or compressed air to reach corners. Avoid harsh cleaners at all times.

Cleaning and Lubrication

Cleaning: Clear materials after each shutdown. Deep-clean the blade chamber and the blade every week. Remove adhered substances to prevent corrosion and damage to the blade edge.

Lubrication:

Once the blade is cleaned, apply anti-rust oil to prevent corrosion.

Bearings, which are the rotating supports that reduce friction within the shredder, should be lubricated with lithium-based grease of NLGI 2 grade (the standard classification for grease thickness and hardness) every 100-500 hours.

The reducer, a gearbox that slows the motor's speed to increase torque, should be filled with ISO VG 320 gear oil (an industry-standard viscosity grade) every 2000 hours, with oil temperature maintained at 45-80℃.

Apply thread locking adhesive (a chemical that secures threaded fasteners) when tightening bolts. This prevents the bolts from loosening due to vibration or use.

Grinding Specifications:

Use a dedicated grinding machine. For each grinding pass, do not exceed a 0.1mm stroke. Maintain the original blade angle. After grinding, check for and remove burrs, and ensure dynamic balance with an imbalance of within 0.5g·cm. Keep the imbalance within 0.5g·cm after removing burrs.

Avoid using water cooling. Allow the blade to cool naturally to prevent cracking.

Replace the blade if the width wear exceeds the allowed limit or if chipping is observed. Use both sides of double-sided blades. For thin material, set the gap to 0.8mm.

Daily: Clear waste materials. Inspect blade damage and bolts. Listen for abnormal sounds. Check lubrication.

Weekly: Deep clean. Sharpen dull blades. Check clearance and parallelism. Lubricate key areas.

Monthly: Comprehensive inspection for wear, calibrate clearance, replace failed blades, thoroughly lubricate, and change oil (per schedule)

New machine or major overhaul: Tighten blades 1 hour after startup. Complete comprehensive inspections and clearance calibration within 72 hours.