2026/03/13
A significant decline in the output of a half-wet material crusher is typically caused by four main categories of issues: wear and tear on consumable parts, screen abnormalities, issues related to the feed and material condition, and material accumulation within the transmission mechanism or crushing chamber. The troubleshooting and resolution procedures are outlined below.
The most common cause is severe wear and dullness of the hammers or blades; this drastically reduces their cutting and impact capabilities, leading to a significant drop in crushing efficiency. It is therefore necessary to promptly replace the worn hammers or blades with new ones. A clogged or damaged screen can also directly reduce output; clogging hinders smooth discharge and causes material to recirculate and pile up, while damage results in uneven particle size and diminished efficiency. Screen perforations should be cleaned regularly, and any damaged screens must be replaced immediately.
If the feeding rate is too fast, uneven, or excessive (overloaded), semi-wet materials are prone to sticking and clogging the crushing chamber, potentially causing the machine to stall. To prevent this, materials should be fed slowly and evenly, avoiding sudden surges in the feed rate. If the material's moisture content is excessively high or its viscosity is significant, it tends to stick to the hammers, adhere to the chamber walls, or gum up the screen; this reduces the effective crushing space and obstructs material circulation. It is recommended to maintain the moisture content within the range of 40%–60%; if the material is excessively wet, it should undergo pre-treatment prior to crushing.
Insufficient rotational speed—often caused by loose or slipping drive belts—results in reduced power transmission. This requires tightening the belts and inspecting the motor and voltage supply. Severe material accumulation or "wall-hanging" within the crushing chamber compresses the working space and disrupts the material flow field; therefore, the inner walls and dead zones of the chamber should be thoroughly cleaned at the end of every shift. Furthermore, the jamming of hard objects or foreign debris can increase resistance and reduce effective output; in such cases, the machine must be shut down to remove the obstructions, and an iron-removal device should be installed. Finally, motor malfunctions or insufficient motor power can also lead to a decline in output; the motor, electrical wiring, and cooling system should be inspected and repaired promptly.
