Jaw Crushers are a popular choice for the primary crushing of a variety of materials, including hard, abrasive and non-friable materials that may be wet but are not sticky.
Crushing of the material takes place between a stationary and moving or swing jaw plate. The swing jaw plate is mounted on a pitman, which is given a reciprocating motion. When the pitman moves toward the stationary jaw, the material is squeezed and broken until it is to a size where it can be discharged out of the bottom of the crushing chamber.
Product size adjustments can be made by increasing or decreasing the closed-side setting, which is the distance between the stationary jaw plate and the swing jaw plate at the bottom of the crushing chamber.
There are two main styles of Jaw Crushers: shape-adjust and hydraulic.
WHAT IS A SHAPE-ADJUST JAW CRUSHER?
SHAPE-adjust Jaw Crushers feature shim plates to maintain the closed-side setting. The shims are located behind the swing jaw as part of the adjustment system, which also includes a hydraulic ram, slide beam with locking wedge, wedge-locking tool, and an on-board hydraulic and electrical system.
WHAT IS A HYDRAULIC JAW CRUSHER?
Hydraulic Jaw Crushers feature hydraulics instead of shims to maintain the closed-side setting. The adjusting components I’m on a hydraulic Jaw Crusher include flange-mounted double-acting cylinders, manifold, slide beam with slide bars and a remote hydraulic and electrical control system.
MAKING A PRODUCT SIZE ADJUSTMENT
If you need to change your product size or accommodate for general wear on the jaw dies, you can increase or decrease the discharge opening by adjusting the closed-side setting. Moving the swing jaw closer to the stationary jaw decreases the closed-side setting, while moving the swing jaw further from the stationary jaw increases the closed-side setting.
For a traditional shim-adjust Jaw Crusher, adjusting the closed-side setting is a bit labor-intensive and requires a complete plant shutdown while the adjustment is being made. Lockout/tagout and all safety procedures must be followed while performing the adjustment to reduce the risk of injury. You also need to make sure you have the appropriate tools, typically wrenches of varying size, to perform the task
The actual adjustment requires the addition or removal of SHAPE to increase or decrease the discharge opening. The procedure involves relieving tension on the toggle plate, adding or removing shims as required and tensioning the toggle plate.
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