Jaw crusher

Vertical Adjustment of the Fixed Jaw Plate When altering the crusher setting, the moving jaw is swung forward and upward or backward and downward, thus altering the vertical position of the movable jaw plate. A faulty vertical relationship between the jaw plates will result in abnormal wear. Therefore, the crushers are equipped with facilities for adjusting the height of the fixed jaw plate. Adjustment can be carried out by means of levers.

Selecting Jaw crusher size

The size of a jaw crusher depends on the desired feeding size and its capacity. The crusher should be large enough to ensure the average size of the products. In practice, incompetent loading and other issues that may arise during operation should be considered. The feed opening between the jaw plates should be significantly larger than the largest rock size entering the crusher to reduce the risk of irregularly shaped rocks tumbling on top of the opening instead of entering for crushing.
Materials should be able to enter the opening continuously to increase total capacity.

The size of the feed opening between the jaw plates varies depending on the type and conditions of crushing. In a primary crusher, when the feeding consists of uniform rocks, controlling roll and cubic rocks is easier than managing irregularly shaped ones.

The power required will vary with the produced size, capacity, and rock characteristics. The given capacities are in metric tons and are based on crushing clean, dry limestone, which weighs approximately 1534 kg/m³ when loose and has a specific gravity of 2.6. Wet, sticky feeds will tend to reduce capacities.
A feeder should be used ahead of the crusher to provide a continuous, regulated feed. All feed material should be of a size that can readily enter the crushing chamber. Undersized material should be removed from the feed using a grizzly or scalping screen to prevent packing and excessive wear on the jaws.

Eccentric Shaft

The eccentric shaft of this machine is made of high-grade forged steel and is very precisely machined. It is generously dimensioned, and the transitions between various diameters are designed to minimize the risk of fatigue as much as possible.

Jaw Plates

The jaw plates of this machine are made of manganese steel, which has excellent wear resistance. Their backs are surface-ground to ensure good contact with the frame and the moving jaw. The jaw plates are reversible, allowing full utilization. Both fine-toothed and coarse-toothed jaw plates are available.

Toggle

The toggle of this crusher is made of high-accuracy steel plates with the proper thickness or is cast from steel. The correct toggle length for this type of crusher ensures the optimal angle between the fixed and moving toggles, preventing it from exceeding the standard length and thereby avoiding the ejection of rocks.

Bearing Arrangement

The roller bearings are of the spherical type, allowing them to adjust to shaft deflection. They are protected by labyrinth seals, which are designed with minimal clearance to effectively prevent dust and dirt from entering the bearings while also stopping grease from leaking out. In this crusher, the frame bearings are mounted in replaceable housings, which are securely fixed in recesses within the frame using bearing caps.

Adjusting Device

The function of the adjusting device is to compensate for wear on the jaw plates,toggle seats, and toggle plate, as well as to provide minor adjustments to the discharge opening. The adjusting wedge is raised or lowered using adjusting bolts, and the horizontal movement of the groove block is followed by the toggle plate and moving jaw, thereby altering the crusher’s discharge opening. Adjustments can be made while the crusher is in operation.
For major changes in the discharge opening, a longer or shorter toggle plate is used. Toggle plates are available in various standard lengths. However, these adjustment methods can only be applied within certain limits. If the lower section of the moving jaw advances too far toward the fixed jaw plate, the nip angle will become too large, affecting material processing.
To make significant changes to the discharge opening without altering the nip angle, a third adjustment method is used. This involves inserting a thicker or thinner shim behind the fixed jaw plate. Shims are available in various standard thicknesses. Changing the shim thickness behind the fixed jaw plate also affects the feed opening at the top. To achieve the maximum possible opening, the thinnest shim necessary for maintaining a suitable nip angle should be used.