Low noise jaw crusher internal structure optimization knowledge

1. Main Internal Noise Sources of Jaw Crusher

1. Impact noise: High‑intensity collision between raw materials, movable jaw and fixed jaw inside crushing chamber.
2. Vibration noise: Unbalanced inertia force of eccentric shaft, flywheel and pulley, frame resonance caused by periodic reciprocating motion of movable jaw计量科学与….
3. Friction noise: Clearance friction of spherical roller bearings, toggle plate contact surface friction, belt slippage of transmission system.
4. Structural radiation noise: Vibration of frame, lining plate and related components radiates noise outward.

2. Crushing Chamber & Jaw Plate Structure Optimization

• Adopt deep‑V‑type curved crushing cavity: Reduce material bouncing and secondary impact inside the cavity, make materials implement layered extrusion crushing instead of violent collision, lower impact noise by 5‑8 dB(A).
• Corrugated / stepped tooth‑shaped jaw plates: Replace flat jaw plates. Wave‑shaped tooth surface increases material bite performance, reduces material sliding and high‑frequency knocking. Optimize tooth height and tooth spacing to disperse instantaneous impact force.
• Optimize matching clearance between jaw plate and frame seat: Strictly control assembly gap, add damping gaskets between jaw plate and frame inner wall to absorb vibration energy transferred from jaw plates to main frame.
• Lining plate material upgrade: Apply composite wear‑resistant damping alloy materials, reduce vibration transmission compared with single high‑manganese steel plates.

3. Transmission System Internal Optimization (Eccentric Shaft‑Bearing‑Flywheel)

1. Inertia force balance optimization for flywheel and pulley

   Add reasonable counterweight blocks on flywheel and large pulley. Adjust counterweight mass and angle to offset partial reciprocating inertia force produced by movable jaw assembly. This measure greatly reduces frame vibration and resonance noise, and can cut system unbalanced inertia force by about 30%‑40%计量科学与…. Strict dynamic balance test is required after casting and processing.

2. Eccentric shaft and bearing seat improvement

• Increase eccentric shaft diameter appropriately, adopt heavy‑load spherical roller bearings; improve bearing seat rigidity, use bolt‑integrated cast‑steel bearing seat instead of welded structure to avoid local deformation and abnormal vibration caused by welding stress.
• Optimize bearing fit clearance, adopt labyrinth sealing structure, reduce friction noise caused by impurity entering bearing chamber.

3. Belt transmission optimization

   Equip automatic V‑belt tensioning device, avoid noise caused by belt slipping and beating. Ensure coaxial precision of motor pulley and crusher pulley to reduce vibration excitation source.

4. Toggle Plate, Movable Jaw & Frame Internal Damping Optimization

• Optimize toggle plate structure: Adopt arc‑surface contact toggle plate, improve contact fitting degree between toggle plate and toggle seat, reduce impact noise at contact position during working stroke. Avoid rigid clearance impact caused by poor fitting.
• Vibration‑isolation damping structure inside movable‑jaw frame: Arrange high‑strength rubber / polyurethane damping buffer pieces between movable jaw and frame contact positions, isolate partial vibration transmitted from movable jaw to main frame, suppress structural resonance noise.
• Frame integral rigidity promotion: Adopt one‑piece high‑quality cast‑steel frame, reduce welding seam quantity; increase local stiffener layout for easy‑vibration areas of frame wall, avoid structural resonance frequency overlapping with crusher working frequency.
• Optimize tension spring and pull‑rod assembly: Calibrate pre‑compression of tension spring, match reasonable spring stiffness, reduce periodic knocking noise of pull‑rod‑spring assembly in high‑speed reciprocating circulation.

5. Internal Auxiliary Structure Optimization

• Internal feeding‑guiding chute lining: Paste polyurethane damping lining inside the feed‑in channel, buffer material falling impact before entering crushing chamber, weaken material impact noise at feeding port.
• Reasonable internal lubrication channel layout: Optimize grease lubrication pipeline, ensure sufficient and uniform lubrication for bearings, toggle plate contact surfaces, reduce dry‑grinding friction noise caused by insufficient lubrication.
• Local internal acoustic absorption structure: Arrange damping‑absorbing composite materials on inner wall of non‑stress cavity of frame, consume partial high‑frequency vibration noise energy without affecting mechanical strength.

6. Practical Performance & Restriction of Internal‑structure‑only Noise Reduction

7. Key Points for Daily Maintenance to Maintain Low‑noise Performance

1. Regularly check wear degree of jaw plates and toggle plates; replace worn parts in time. Uneven wear will amplify impact and friction noise sharply.
2. Keep bearings and kinematic pairs well‑lubricated.
3. Check fastening status of flywheel counterweight block, bearing‑seat bolts and damping gaskets; loose internal components will produce extra vibration noise.