A jaw crusher is a primary crushing machine used in mining, quarrying, and recycling industries to break down large rocks into smaller pieces. It consists of several key parts, each with specific functions. Below is an overview of the main components and their roles:
Main Parts of a Jaw Crusher & Their Functions
# 1. Fixed Jaw (Stationary Die)
– The fixed jaw is the immovable part of the crusher that provides a surface against which the rock is crushed.
– Made of high manganese steel or other wear-resistant materials to withstand abrasion.
# 2. Movable Jaw (Swing Jaw)
– The movable jaw moves back and forth against the fixed jaw, exerting compressive force to break rocks.
– Driven by an eccentric shaft connected to a motor via belts/pulleys.
# 3. Eccentric Shaft
– Rotates to create the up-and-down motion of the movable jaw.
– Transmits power from the motor to the jaw assembly.
# 4. Toggle Plate (Toggle Seat)
– Acts as a safety mechanism to protect the crusher from overload damage by breaking if excessive force is applied.
– Also helps adjust the discharge opening size when replaced with different thicknesses.
# 5. Cheek Plates (Side Liners)
– Protect the sides of the crusher frame from wear caused by rock abrasion.
– Usually made of manganese steel for durability.
# 6. Flywheel
– Stores rotational energy to ensure smooth operation and reduce power fluctuations during crushing cycles.
# 7. Tension Rod & Spring
– Maintains pressure on the toggle plate and helps return the movable jaw after each crushing stroke.
# 8. Adjustment Wedge (Discharge Setting Adjustment System)
– Allows operators to adjust the gap between the jaws, controlling the size of crushed output material (CSS – Closed Side Setting).
# 9. Pitman (Moving Jaw Support Arm)
– Connects the movable jaw to the e.jpg)
ntric shaft, transferring motion efficiently for crushing action.
Working Principle:
1. The motor drives the eccentric shaft, causing the movable jaw to move in an elliptical motion.
2. Rocks enter through the top feed opening and are crushed between the fixed and moving jaws as they move closer together (compression).
3. Crushed material exits