Analysis of Multi-Head Crusher Fault Maintenance

The multi-impact crusher is one of the commonly used equipment for crushing old concrete road surfaces, but what are the common malfunctions of a multi-impact crusher, and how should it be maintained?

One: Bearing Overheating

Reason Analysis:

(1) Poor Lubrication: Insufficient, excessive, or contaminated grease, which leads to friction heat not being adequately dissipated. (2) Bearing Wear: In the working area of a multi-impact crusher, dust is abundant, and some fine dust enters the high-speed rotating bearing housing. This causes the grease inside to deteriorate, leading to poor lubrication and bearing wear. When the bearing continues to operate in a worn state, increased friction and heat lead to a rise in bearing temperature. (3) Improper Bearing Installation: Incorrect installation, low precision, and bending of the bearing can produce torque during rotation, causing the bearing to overheat or wear, resulting in vibration, increased noise, and a rise in temperature.

Exclusion Method:

(1) Replace or add an adequate amount of lubricant; (2) The lubricant in the bearing should be 50% of its volume; (3) Clean the bearing or replace it, inspect, and install the bearing correctly.

Machine Vibration

Reason Analysis:

(1) When changing hammer heads, or due to worn-out hammer heads causing the rotor's static balance to be inadequate; (2) Hammer head breakage in a multi-hammer crusher leading to unbalanced rotor; (3) Bent or broken shaft pins; (4) Cracks in the triangular or circular disk; (5) Loose foundation bolts.

Exclusion Methods:

(1) Disassemble the hammer, select one based on weight, ensuring the total weight of the hammer on each hammer shaft is equal to the total weight of the relative hammer on the shaft, thereby achieving static balance as required; (2) Replace the hammer head; (3) Replace the pin shaft; (4) Weld and repair or replace.

(5) Securely tighten the anchor bolts.