Matching Specifications of Wear – Resistant Fixed Jaw Plates for Jaw Crushers
Understanding the Role of Fixed Jaw Plates in Jaw Crushers
The fixed jaw plate is a crucial component of a jaw crusher. It works in tandem with the movable jaw plate to form the crushing chamber. When the materials enter the crushing chamber, they are subjected to the squeezing and crushing forces exerted by the two jaw plates. The fixed jaw plate provides a stable surface for the materials to be crushed against, and its wear – resistance directly affects the overall performance and service life of the jaw crusher.
Factors Influencing the Selection of Wear – Resistant Specifications
Material Hardness and Abrasiveness
The hardness and abrasiveness of the materials to be crushed are primary considerations when choosing the wear – resistant specifications of the fixed jaw plate. For soft materials with low abrasiveness, such as limestone with a compressive strength of less than 80 MPa, a jaw plate with relatively lower hardness but good toughness can be selected. This is because soft materials do not require extremely high – hardness materials to resist wear, and a jaw plate with good toughness can better withstand the impact forces during the crushing process without cracking.
On the other hand, for hard and highly abrasive materials like granite with a compressive strength greater than 150 MPa, high – hardness materials are essential. High – chromium cast iron, with a hardness of up to HRC 60 – 65, is an excellent choice. Its high hardness can effectively resist the abrasive wear caused by hard materials, ensuring a longer service life of the fixed jaw plate.
Impact Load Conditions
The impact load conditions in the crushing process also play a significant role in determining the wear – resistant specifications. In large – scale jaw crushers, which are subjected to high – impact loads, materials with good impact – resistance and the ability to undergo work – hardening are preferred. High – manganese steel, such as ZGMn13, is a traditional and widely used material in such cases. When subjected to large impact or contact stress, the surface layer of high – manganese steel rapidly undergoes work – hardening, increasing its hardness by 5 – 7 times compared to other materials, thus enhancing its wear resistance.
For medium – and small – sized jaw crushers with relatively lower impact loads, materials with a combination of high hardness and appropriate toughness can be selected. For example, medium – carbon low – alloy cast steel can provide both high hardness to resist wear and sufficient toughness to absorb impact energy, making it a suitable choice for these crushers.
Crusher Size and Model
The size and model of the jaw crusher are also important factors. Different sizes of jaw crushers have different requirements for the wear – resistant specifications of the fixed jaw plate. Larger crushers generally require jaw plates with higher strength and wear resistance to handle larger – sized and harder materials. For example, a PE900×1200 jaw crusher, which is used for crushing large – sized materials, may need a fixed jaw plate made of a more durable material compared to a PE150×250 jaw crusher used for smaller – sized materials.
Common Wear – Resistant Material Options for Fixed Jaw Plates
High – Manganese Steel
High – manganese steel has been a popular choice for fixed jaw plates for a long time. Its main advantage lies in its excellent work – hardening ability. When the jaw plate is in use, the surface layer is continuously deformed under the impact of materials, which leads to an increase in hardness. This property allows high – manganese steel to adapt well to high – impact crushing environments. However, it requires sufficient impact force to trigger work – hardening. If the impact force is insufficient, its wear resistance may not be fully utilized.
High – Chromium Cast Iron
High – chromium cast iron is known for its high hardness and excellent wear resistance. The presence of hard chromium carbides in its matrix makes it highly resistant to abrasive wear. It is particularly suitable for crushing hard and abrasive materials. However, high – chromium cast iron has relatively low toughness, which makes it prone to brittle fracture under high – impact loads. Therefore, it is often used in combination with other materials to form composite structures.
Medium – Carbon Low – Alloy Cast Steel
Medium – carbon low – alloy cast steel combines high hardness with appropriate toughness. It can resist the cut – ting and repeated extrusion – induced fatigue peeling of materials, and its service life can be several times longer than that of high – manganese steel in some cases. This material is suitable for medium – and small – sized jaw crushers with relatively lower impact loads and can handle a variety of materials with different hardness levels.
Installation and Maintenance Considerations for Wear – Resistant Fixed Jaw Plates
Proper Installation
When installing the fixed jaw plate, it is crucial to ensure that it is firmly attached to the frame of the jaw crusher. The contact surface between the jaw plate and the frame should be flat. Soft metals such as lead or zinc can be used as gaskets between the jaw plate and the frame, and bolts should be used for tightening. This helps to prevent relative sliding between the jaw plate and the frame during operation, which can cause wear or even damage to the jaw plate.
Regular Inspection and Maintenance
Regular inspection of the fixed jaw plate is necessary to check for signs of wear, cracks, or loose bolts. If minor cracks or local chipping are found, they can be repaired using high – manganese steel welding rods. After welding, heat treatment should be carried out to eliminate stress and prevent re – cracking during use. Additionally, the fixed jaw plate should be flipped or replaced in a timely manner when it shows significant wear to ensure the normal operation of the jaw crusher.
Tangshan Polarislink Advanced Materials Technology Co., Ltd. was established in 1996 and is located in Tangshan, Hebei Province, China. The company is a source manufacturer specializing in wear parts for mining machinery. Relying on its own core factory, the company has been deeply engaged in heavy manufacturing for nearly 30 years, forming a stable industrial foundation centered on manufacturing capability.
The main products include high manganese steel hammers, jaw plates, bushings, mantles, impact plates, high chromium blow bars, cast steel bushings （Mn13/Mn13Cr2，Mn18/Mn18cr2，Mn22/Mn22Cr2） and various other wear-resistant castings, which are widely used in mining crushing, sand and aggregate production, cement and building materials industries. The company is certified by CE and ISO9001, and is capable of long-term batch supply and high-standard customized delivery.
The manufacturing base covers about 100,000 square meters, with a building area of 36,000 square meters, and is equipped with a complete production system including melting, casting, machining, heat treatment and final inspection. With 11 medium-frequency furnaces of 2–10 tons, 2 refining furnaces of 25 tons, 18 heat-treatment furnaces and more than 30 large CNC machines, the annual comprehensive capacity exceeds 50,000 tons, enabling stable production of large, high-strength and high-wear-resistant industrial castings.Official website address:https://www.polarislink.net/
