Jaw plates are the most important component of jaw crushers. It is between the fixed plate and the swing plate that the crushing takes place. Since these plates do most of the work, they often need replacement. If you are part of an industry that uses jaw crushers, you undoubtedly know the importance of jaw plates. There are many types of jaw plates available in the market today. These include-
1. Straight Jaw Plates
Straight jaw plates come with many advantages. They have the maximum feed opening, an effective nip angle and the highest reduction ratios. The drawback with them, however, is that they do not last long, especially if they have smaller Close Side Setting or CSS settings. They may plug up regularly. Straight jaw plates are a good option if you are running a small business, but larger operations seem to find them inefficient.
2. Half- Belly Jaw Plates
Half belly jaw plates are essentially straight with a curved end. In terms of wear distribution, they fare better than straight plates and have fewer plugging problems. However, these plates have a lower reduction ratio and a smaller feed opening as compared to the straight ones. When the feed material has a large amount of fines and the bottom-lining wears off quickly, these plates become useful.
3. Full Belly Jaw Plates
These plates are fully curved and have the best wear distribution amongst the three-crusher liners. Due to this, full belly jaw plates are wont to last longer than the other two types. Their plugging is fair and they look decent. They are also capable of being used with smaller CSS settings without sustaining much wear on the ends. Due to their curved shape of these plates, however, the jaw crusher loses its effective nip angle in the upper part of the crushing box. These jaw dies are used particularly when the crusher is larger than the feed to be crushed as they reduce the feed opening. With them, the largest feed won’t exceed the gap between the jaw dies.
4. Jaw Plate Designs and Features
Some features are common to all jaw plates, no matter what type they are. These are-
– Jaw plates should be processed using cold processing hardening technology, in order to improve their hardness
– During the process of natural phase change, water toughening technology should be used to avoid poor performance
– The wear resisting degree in plates that use super high manganese steel and alloy high manganese is higher than those that use traditional materials
– The ridges in the corrugated surface of jaw plates produce a concentrated force which breaks rocks with a lesser effort. This reduces the power requirements and the crusher has fewer loads to contend with. The trouble, however, is that the corrugated surface can be easily plugged and the feed opening thus reduced.
You should choose the jaw plates you use in crushers, depending upon your particular requirements.