After nearly 30 years of innovative development in the mining machinery industry, Chongqing Longjian Group has now developed and produced a variety of jaw crushers such as PE jaw crushers, JC European jaw crushers, etc., mainly used for compressive strength not exceeding The medium crushing and coarse crushing operations of 320 MPa of various materials have the characteristics of large crushing ratio, high output, uniform product size, simple structure, reliable work, easy maintenance, and economic operating costs. At present, the Chongqing Longjian Group's jaw crusher equipment has been widely used in mining, smelting, building materials, highways, railways, water conservancy and other departments. The product sales and services of tens of thousands of enterprises are exported to Central Asia, West Asia, Southeast Asia, Africa, Australia, North and South America and many other countries and regions have been well received by customers at home and abroad.

       As we all know, when the jaw crusher is working, the crushing plate is directly in contact with the material and bears huge crushing force and friction of the material. The service life of the crushing plate is directly related to the working efficiency and production cost of the jaw crusher. Therefore, Chongqing Longjian Group has improved the durability of the crushing plate of the jaw crusher from aspects of design, material selection, assembly and process improvement during use.

       The working mechanism of the jaw crusher is composed of a working chamber composed of a movable jaw and a fixed jaw. The movable jaw and the fixed jaw bear a huge crushing force and the friction effect of the material, which is easy to wear. In order to protect the jaw plate and reduce the damage of important parts, Chongqing Longjian Group installs wear-resistant lining on the surface of moving and fixed jaws. This kind of lining is also called crushing board. The surface of the crushing plate is usually made into a tooth shape. The angle of the peak of the crushing plate varies from 90 to 120, and its size is determined by the nature and block size of the crushed material. When the broken material is large, the angle is larger; when the broken material is small, the angle can be smaller. The size of the tooth pitch depends on the particle size of the product, which is usually about equal to the width of the discharge port, and the ratio of the tooth height to the tooth pitch can be taken from 1/2 to 1/3. When working, the speed of the upper and lower parts of the crushing plate is different due to gravity. The lower part wears faster than the upper part. When the jaw crusher is working, the crushing plate directly contacts the material and bears huge crushing force and material. The friction effect and the service life of the crushing plate are directly related to the working efficiency and production cost of the jaw crusher.

       For this reason, it is particularly important to extend the service life of the crushing plate of the jaw crusher. Chongqing Longjian Group Seiko Manufacturing Co., Ltd. has improved durability in terms of structure, material selection, assembly and improvement in actual use.

       1. Structure and material selection

       During the design of Chongqing Longjian Group, the broken plates of moving and fixed jaws should be tooth-to-tooth. In this way, in addition to the squeezing effect, the material also has a bending effect during crushing, and the material is relatively easy to crush. In order to extend the service life of the crushing plate, the crushing plate of the small and medium-sized crusher is designed to be symmetrical up and down, and the head can be used when the lower part is worn; Replacing the crushing board to reduce costs. The material of the crushing board can be white 1: 3 cast iron. White 1: 3 cast iron has the advantages of greater hardness, better wear resistance, cheaper price, and easy purchase; the disadvantages are brittleness, easy breakage, and short service life. In order to improve the service life of the crushing plate, manganese steel with good toughness containing more than 12% manganese can also be used as the material, such as ZGMn13, which is commonly used. Although the hardness is not high (approximately 210 HB), but because of the characteristics of cold work hardening, the surface of the part is continuously strengthened under the pressure, so it is constantly worn and strengthened in the work, and it is scrapped until it is worn out. After casting, the manganese steel crushing plate is subjected to water toughness treatment, that is, the cast manganese steel crushing plate is heated to 1000-11 O 0 ℃ and then quenched in water. Operation is basically the same as quenching. After the water toughening treatment, a uniform metallographic structure can be obtained, and the metallographic structure can be fixed, which avoids the phase change that naturally occurs during use and deteriorates the performance. The disadvantage of manganese steel is that it is more expensive, but considering the durability and production volume, it is more economical to use ZGMn13 than white 1: 3 cast iron.

       2. Assembly

       During assembly, the crushing plate is firmly attached to the jaw plate. When the crusher is working, there should be no loosening of the crushing plate, otherwise it is easy to break or wear the crushing plate, reducing the durability of the crushing plate. This requires that the crushing plate must be firmly attached to the E plate. Chongqing Longjian Group adopts soft metal (such as lead, zinc, etc.) as the gasket between the crushing plate and the E plate, and fastens it with bolts. Therefore, the crushing plate must be installed during assembly to prolong the durability of the crushing plate. In addition, in the actual use of the jaw crusher produced by Chongqing Longjian Group, specific analysis can be carried out for the specific situation, and appropriate technical measures can be taken to prevent the broken plate from loosening, increased wear, and breakage, thereby extending the durability of the broken plate Degree, reduce costs and improve work efficiency.

       3. Flexible use during use

       In the actual production process, the crushing plate directly interacts with the material, and the crushing force is very large. Especially when crushing materials with greater hardness, the bolts installed with the crushing plate vibrate and the nut loosens due to the increase of the crushing force, which makes the crushing plate wear and aggravate. The extremely loud noise causes hidden dangers. In severe cases, the broken plate falls off or breaks to stop the equipment and affect the normal production. In this case, you can usually only tighten the bolts and nuts before starting the machine. However, the problem cannot be solved completely. It is necessary to analyze the specific problem according to the actual situation on the spot and find a way to take a practical and feasible method to solve the problem. Chongqing Longjian Group recommends the use of spring anti-loosening and vibration reduction devices to solve the loosening of the crushing plate during work, thereby extending the durability of the crushing plate and improving the work efficiency. The specific method is to use the spring to make the bolt anti-loose and self-tightening device. The device is composed of an inner spring gland, a spring, and an outer spring gland. Put this device on the bolt to tighten the nut, because the spring is compressed to a certain degree by the nut After that, a strong anti-vibration effect is produced to extend the durability of the crushing plate. From the aspects of structure, material selection, assembly, and process improvement during use, the durability of the crushing plate can be well extended, thereby reducing production costs.