Fault Analysis and Solutions for Vibrating Screens During Operation

Frequent damage to key components of vibrating screens directly impacts production efficiency. Implementing routine maintenance and analyzing common fault causes are essential. This document analyzes the reasons for abnormal vibration trajectories in vibrating screens and provides corresponding solutions.

Any malfunction during the vibrating screen's operation will disrupt subsequent production processes. When the direction of excitation force generated by the vibrator deviates or spring damping parameters fail, the screen box may exhibit “twisted vibration,” leading to material deviation, resonance, or stagnation.

Once “twisted vibration” occurs, it not only compromises screening efficiency but also damages the equipment structure. This leads to uneven force distribution, causing the screen box to crack and significantly shortening the vibrating screen's service life. The causes and solutions are as follows:

① If the vibrating screen fails to start or exhibits low amplitude:   - Inspect for obstructions, motor damage, faulty circuit components, or insufficient voltage.   - If these issues are ruled out, check for excessive material buildup on the screen surface and clear it.   - Additionally, verify that coupling bolts are not loose. Adjust the position of the eccentric shaft weights or auxiliary eccentric weights as needed.

② If the screen rotates too slowly with bearing overheating, this indicates inadequate routine maintenance, insufficient bearing grease, or poor quality of newly added grease causing bearing blockage or labyrinth seal jamming.

③ Prolonged operation at critical frequency may cause cracks in the screen side plates, beam fractures, or structural component damage. This could result from loose side plate fastening bolts, spring deformation, or excessive eccentric block error. Replace damaged parts and tighten bolts accordingly.

④ Poor material flow on the vibrating screen surface primarily stems from three causes: First, insufficient rigidity of the screen box or loosened connecting bolts—tighten promptly. Second, lateral imbalance of the screen box—inspect the support foot springs themselves, immediately replace springs or modify support dimensions. Alternatively, damaged screen mesh may be the cause—replace the screen immediately. Third, improper operation, specifically uneven feeding.

⑤ Excessive noise in the vibrating screen may result from bearing damage, loose bolts, broken crossbeams, or damaged springs. Except for bolts which can be tightened promptly, all other issues require replacement of parts.

⑥ Poor screening quality in the vibrating screen can stem from mesh clogging, increased particle size and moisture content in the material, excessively thick feed layers, or uneven feeding. Additionally, insufficient tension on both sides of the screen mesh may cause belt slackness and reduced traction during operation. After resolving the underlying issues, running the machine in reverse for a period can improve screening efficiency.

Vibrating screens frequently encounter operational failures, necessitating immediate troubleshooting upon occurrence. Concurrently, strengthen routine maintenance and upkeep of linear vibrating screens by assigning dedicated technical personnel for specialized operation. Only through such measures can equipment better serve enterprises and generate value.

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