1. Liner type
Fixed liner (fixed jaw liner): installed on the fixed jaw bed, withstand high-intensity extrusion and sliding friction.
Moveable liner (moving jaw liner): installed on the moving jaw, reciprocating with the moving jaw, and wear faster.
Side guard: protect both sides of the jaw bed to prevent the material from wearing the frame.
2. Material selection
The liner needs to have high hardness, wear resistance and impact resistance. Common materials include:
High manganese steel (ZGMn13): traditional material, strong impact resistance, suitable for hard materials (such as granite).
Alloy steel (Cr-Mo): wear resistance is better than high manganese steel, suitable for medium-hard materials.
High chromium cast iron (Cr20~26): extremely wear-resistant, but brittle, need to optimize the design to avoid breakage.
Composite material: such as tungsten carbide inlaid liner, the service life is extended by 3~5 times, but the cost is high.
3. Liner tooth design
Smooth type: used for fine crushing, uniform particle size of the discharge material.
Tooth shape (triangle, trapezoid): Enhanced bite force, suitable for coarse crushing or high hardness materials.
Symmetrical/asymmetric design: Asymmetric tooth shape can reduce wear rate and extend service life.
4. Wear and replacement
Causes of wear: material hardness, crushing ratio, liner material, operating pressure, etc.
Judgment criteria: When the liner is worn to 60%~70% of the original thickness or the tooth shape is flattened, it needs to be replaced.
Replacement steps:
1. Stop the machine and cut off the power supply;
2. Remove the old liner (pay attention to the rust of the bolts);
3. Clean the surface of the jaw bed;
4. Install the new liner to ensure that it is tightened without looseness.
5. Maintenance tips
Check the tightening of the liner bolts every week;
Record the wear cycle and formulate a preventive replacement plan;
When crushing sticky materials, regularly clean the adhesion on the liner surface.
