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Comprehensive Guide to Jaw Crushers: Uses, Components, and Benefits

A mobile jaw crusher is a track-mounted primary crushing machine that’s easily moveable on and between production sites. They are used in aggregate production recycling applications and mining operations. Their purpose is to crush down large materials into smaller ones, this can be hard rock, granite, limestone, sandstone, concrete, or demolition, resulting in a useable product that can be either used, sold, or incorporated into a secondary crushing procedure to produce smaller sizes.

Stewart Plant Sales: Your Source for Jaw Crushers

At Stewart Plant Sales, we specialise in selling and servicing top-quality Tesab jaw crushers. Our extensive new Tesab range includes the Tesab jaw crusher series, starting with the 500i, followed by the 600i, 700i, and 800i models. For those seeking hybrid options, we also offer the 700ie and 800ie models.

Key Components of Jaw Crusher

1. Crusher Body 

The design of the crusher body ensures that it's capable of withstanding bending and fracturing stress even when crushing the hardest of materials.

2. Pitman

This refers to the swinging jaw and achieves the reciprocating movement through the eccentric motion of the main flywheel hhaft which creates an enormous force in each stroke.

3. Fixed Jaw

Directly opposite the swinging jaw which is attached to pitman, both swinging and fixed jaw and normally made of manganese which is a very hard metal. Both jaws when worn can be flipped to extend their life span.

4. Flywheel

The flywheel is the heart of the rotational energy needed to feed into the eccentric shaft to maintain rotational inertia as the jaw crushes material.

5. Jaw Crusher Bearings

Normally there are four bearings on the eccentric shaft, two on each side of the crusher body supporting the main shaft and two at the end of the pitman. The bearings are normally tapered roller bearings.

6. Toggle Plate

The bottom of pitman is supported by the toggle plate,  which allows the bottom of the pitman to move up and down with the motion of the eccentric shaft, also serves as a safety failsafe for the whole jaw to prevent further damage should any uncrushable material enter the crushing jaws, designed to bend or even break if necessary.

7. Toggle Rams, Spring & Screw Rod

Without these the bottom of the pitman would just flop around, these ensure the pitman is firmly fixed to the toggle plate. The toggle seats are fixed points where the toggle plate contacts the pitman.

8. CSS, (Closed Side Settings)

Crushed material size is achieved by adjusting the opening at the bottom of the jaws, different jaw crusher models can have shim plates, and others have wedges moved by hydraulic rams.

9. Cheek Plates

These are wear plates that protect the inside of the crusher body during the material being crushed.

10. Power Source

Crushers are powered by either a diesel engine, diesel hybrid, or fully electric depending on model.

How Jaw Crushers Work

Material is loaded with the excavator into the hopper which then heads along the vibrating feeder tray and over the pre-screen dropping into the crusher body, the swing jaw motion compresses the material against the fixed jaw and the processed material falls out the bottom dictated gap that’s been set, then onto the main belt. Heads up the main belt, on most there’s a magnet cross belt that will take out any metals in the processed material, finally dropping out from the top of the main belt into a stockpile or into a secondary crusher, depending on the material size required.

Benefits of Having a Jaw Crusher On-Site

  • Versatility: Jaw crushers can handle a wide range of aggregates and recycling demands
  • High Productivity: Jaw Crushers are renowned for high tonnages
  • Ease of Maintenance: Their mechanical components are straightforward, ensuring quick servicing and repairs to minimise any downtime
  • Adjustable Output: The final product size can be easily adjusted to meet the required specifications
  • Efficiency: jaw crushers are designed to be energy efficient, without affecting production. Tesab now offer hybrid versions on both the 700ie and the 800ie models to reduce the running cost even further.                                                                                                   

Selecting the right Jaw Crusher for you

When considering the purchase of a jaw crusher, it's crucial to assess how it will be used and the specific application requirements. Our Material Processing Manager, Paul Toulouse is on hand to give the correct advice and guidance on the correct model required for the customer's requirements including full demonstration setups.

For more information about our range of jaw crushers, please contact Materials Processing Manager Paul Toulouse at 07736928041 or via email at