Jaw crushers are typically used as primary crushers

Jaw Crusher Pitman The pitman means 'connecting rod' is the main moving part in it. It forms the moving side of the jaw, while the stationary or fixed one forms the other. It achieves its movement through the eccentric machining of the flywheel shaft. Manganese Dies in the Jaw Crusher The jaw crusher pitman is covered on the inward facing side with dies made of manganese, an extremely hard metal. These dies often have scalloped faces. The dies are usually symmetrical top to bottom and can be flipped over that way. This is handy as most wear occurs at the bottom (closed side) of the jaw and flipping them over provides another equal period of use before they must be replaced. The Stationary Jaw plate It is opposite to the pitman face and is statically mounted. It is also covered with a manganese jaw die. It is shown in the illustrations. Eccentric Input Shaft The pitman is put in motion by the oscillation of an eccentric lobe on a shaft that goes through the pitman's entire length. This movement might total only 1 1/2' but produces substantial force to crush material. This force is also put on the shaft itself so they are constructed with large dimensions and of hardened steel. The Input Sheave/Flywheel Rotational energy is fed into the eccentric shaft by means of a sheave pulley which usually has multiple V-belt grooves. In addition to turning the pitman eccentric shaft it usually has substantial mass to help maintain rotational inertia as the jaw crushes material. Protecting the Jaw Crusher: the Toggle Plate The bottom of the pitman is supported by a reflex-curved piece of metal called the toggle plate. It serves the purpose of allowing the bottom of the pitman to move up and down with the motion of the eccentric shaft as well as serve as a safety mechanism for the entire jaw. Should a piece of non-crushable material such as a steel loader tooth (sometimes called 'tramp iron') enter the jaw and be larger than the closed side setting it can't be crushed nor pass through. In this case, the toggle plate will crush and prevent further damage. the Tension Rod Retains the Toggle Plate Without the tension rod & spring the bottom of the pitman would just flop around as it isn't connected to the toggle plate, rather just resting against it in the toggle seat. The Cheek Plates The sides of the jaw crusher are logically called cheeks and they are also covered with high-strength manganese steel plates for durability. The Eccentric Shaft Bearings There are typically four bearings on the eccentric shaft: two on each side of the jaw frame supporting the shaft and two at each end of the pitman. These bearings are typically roller in style and usually have labyrinth seals and some are lubricated with an oil bath system. The Adjustment: Closed Side Opening Shims Depending on the disposition of the material being crushed, different maximum-sized pieces of material may be required. This is achieved by adjusting the opening at the bottom of the jaw, commonly referred to as the 'closed side setting'. Shims (sometimes implemented and a more adjustable or hydraulic fashion) allow for this adjustment. If you are interested in our jaw crushers, please don't hesitate to contact us! Sanway can provide our customers with all kinds of the crushers: PE jaw crusher, PEX small jaw crusher and SJ hydraulic jaw crusher. There isn't a tremendous variation in the crushers, the primary differences is in their size. But SJ hydraulic jaw crusher is a kind of new jaw crushers with hydraulic adjustment device. Moreover, the SJ hydraulic jaw crusher has a superior performance in capacity, operating and stability. Company website: http://www.sanway-china.com/