Methods to extend jaw plate service life of jaw crusher

1. Optimize Raw Material Conditions

Control feeding particle size strictly. Oversized stones frequently cause heavy impact and localized stress on jaw plates. Keep feed size within the equipment’s designed range.
Reduce sticky, wet and muddy materials. Wet viscous ore adheres to the crushing cavity, changes actual crushing clearance and causes uneven wear.
Remove non-crushing impurities like iron blocks, steel bars and metal scraps. Hard foreign objects will create severe impact damage or even crack the jaw plate.
Grade raw materials if possible. Mixing fine powder properly can buffer direct collision between large rocks and jaw plates.

Maintain uniform continuous feeding. Avoid partial feeding, which leads to one-sided wear of movable and fixed jaw plates.
Set proper discharge gap. Too small gap increases squeezing force and accelerates abrasion; too large gap reduces crushing efficiency and causes repeated cyclic impact.
Do not run the machine under overload for long periods. Overload raises contact pressure on jaw plate working surface and speeds up material abrasion.
Prevent empty running. Idle operation brings unnecessary metal-to-metal impact between jaw plates. Stop feeding first before shutdown.

Select matched jaw plate materials according to ore hardness: high manganese steel for hard rock; high chromium alloy composite jaw plates for highly abrasive stone.
Install jaw plates tightly. Eliminate gaps between jaw plate and jaw body. Use filler (zinc alloy or cement mortar) to ensure full contact, avoiding local vibration and loose bolts.
Check fastening bolts regularly. Loose jaw plate bolts are a common cause of accelerated wear and plate cracking. Retighten bolts during routine inspection.
Flip jaw plates in time. Most jaw plates have symmetrical structure. When one side wears down to a certain degree, reverse and reinstall to use the other working face, double service life. Replace jaw plates before excessive wear damages the jaw body.

Check the toggle plate, toggle seat and bearing clearance. Abnormal clearance causes unstable swing trajectory of movable jaw, leading to irregular jaw plate wear.
Keep the crushing cavity clean. Clear accumulated materials after shutdown to avoid hard deposits affecting jaw movement.
Monitor lubrication system. Poor lubrication causes abnormal swing resistance of movable jaw, changes crushing force distribution and worsens jaw plate abrasion.
Check wear condition periodically. Establish wear log to track thinning rate of tooth profile, arrange replacement plan in advance.

Choose tooth profile matching your material: sharp teeth for coarse crushing of large blocks; dense flat teeth for fine crushing. Worn tooth profile will reduce crushing performance and increase abrasion.
Ensure the matching between movable jaw and fixed jaw tooth shape. Poor tooth engagement leads to point contact instead of surface contact, generating concentrated stress.

Arrange pre-screening before crusher to remove fine particles in advance, lowering the load on jaw plates.
For highly abrasive ore, adopt overlay welding repair on worn jaw plate surface (professional welding required) to restore tooth shape and extend usage time.
Train operators to avoid sudden feeding fluctuation, impact loading and metal entering the cavity.