What are the parts of jaw crusher?
Jaw crushers are widely used in mining, construction, and other industries to crush large stones into smaller pieces. They are designed to be highly efficient and reliable, allowing for the maximum processing of materials. To understand how jaw crushers work, it is essential to know about their different parts and their functions. In this article, we will explore the various components of a jaw crusher and how they contribute to its overall performance.
1. Frame
The frame is the main structure of a jaw crusher, providing support and strength to withstand the substantial forces encountered during crushing operations. It is typically made of cast iron or steel and is designed to withstand high-stress conditions. Frames are usually equipped with two vertical side plates known as cheek plates, which are attached to the frame with bolts. Cheek plates help to distribute the crushing force evenly across the jaw plates.
2. Jaw plates
Jaw plates are the most important and frequently-replaced wear parts of a jaw crusher. They are responsible for crushing the material against fixed and movable jaws to produce the desired product size. Jaw plates come in two main types: the fixed jaw plate and the movable jaw plate. The fixed jaw plate is stationary and acts as a platform against which the material is crushed. The movable jaw plate, on the other hand, moves back and forth to exert pressure on the material during the crushing process.
3. Pitman
The pitman is a moving part located near the bottom of the jaw crusher. It connects the toggle plate and the movable jaw, allowing the latter to move up and down to crush the material. The pitman is usually made of high-quality cast steel and is precision machined to withstand severe operating conditions. It also acts as a pivot point for the toggle plates, which control the jaw crusher''s opening and closing movements.
4. Toggle plates
Toggle plates are located between the pitman and the movable jaw. They serve as a safety device to prevent overloading of the crusher by providing a means for the release of uncrushable material. When an uncrushable object enters the crushing chamber, the toggle plates automatically open, allowing the uncrushable material to pass through without causing damage to the crusher. Once the uncrushable material has passed, the toggle plates close, resuming normal crushing operations.
5. Flywheel
The flywheel is a heavy, wheel-like component that stores rotational energy. It is mounted on one end of the eccentric shaft, which rotates to drive the movable jaw. The primary function of the flywheel is to balance the inertia forces generated by the moving jaw and to maintain the correct speed and momentum of the crushing process. It also serves as a reservoir of energy, enabling the crusher to quickly respond to changes in material feed.
6. Eccentric shaft
The eccentric shaft is a crucial component that drives the movement of the movable jaw. It is a forged alloy steel shaft with a large eccentricity at one end. The eccentric shaft is mounted in heavy-duty spherical roller bearings, which ensure smooth operation and minimize power loss due to friction. As the eccentric shaft rotates, it causes the movable jaw to move in an elliptical pattern, crushing the material against the fixed jaw.
7. Bearings
Bearings play a vital role in ensuring the smooth and efficient operation of a jaw crusher. They support the rotating motion of the eccentric shaft and the continuous movement of the movable jaw. Jaw crushers typically use spherical roller bearings, which can handle high radial loads and moderate axial loads. These bearings are lubricated with grease, which helps to reduce friction and extend their service life.
8. Wedges
Wedges are used to adjust the gap between the fixed and movable jaws to control the desired product size. By inserting or removing wedges, the crusher''s discharge opening can be adjusted to accommodate different material sizes. Wedges are typically made of high-strength steel and are easy to install and remove.
9. Tension rods
Tension rods provide the necessary tension to keep the toggle plates in position and maintain the proper operating clearance between the jaw plates. They are an essential part of the jaw crusher''s toggle system. Tension rods are made of high-quality steel and are connected to the toggle plates through tension springs.
10. Hydraulic cylinder
Some jaw crushers are equipped with a hydraulic cylinder that allows for the adjustment of the discharge setting. This feature is particularly useful when dealing with varying material sizes or when a change in the desired product size is needed. The hydraulic cylinder applies hydraulic pressure to the toggle plates, causing them to move and adjust the crusher''s discharge opening.
In conclusion,
Jaw crushers consist of several important parts that work together to produce the desired crushing results. Understanding the functions of each component allows operators to troubleshoot any problems that may arise and maximize the crusher''s performance. The frame, jaw plates, pitman, toggle plates, flywheel, eccentric shaft, bearings, wedges, tension rods, and hydraulic cylinder all play a critical role in the efficient operation of a jaw crusher. By properly maintaining and replacing these parts, jaw crushers can deliver consistent and reliable crushing performance, ensuring the productivity and profitability of various industries.
