Jaw crusher's working mechanism is composed of working chamber composed of moving jaw and fixed jaw. Dynamic jaw and fixed jaw are subjected to great crushing force and friction of materials. They are easy to wear. In order to protect jaw panels, they are generally Fixed surface mounted wear-resistant liner, this liner is also known as crushing tooth plate. The surface of the crushing tooth plate is usually made into a tooth shape, and the angle of the crushing plate tooth peak is 90° to 120°, and the size of the crushing tooth plate is determined by the nature and the degree of crushing of the crushing material. When crushing the large material, the angle is larger; When breaking small pieces of material, the angle can be smaller. The size of the tooth pitch depends on the particle size of the product and is usually about equal to the width of the discharge port. The ratio of the tooth height to the tooth pitch can be taken as 1/2 to 1/3. During work, the speed of wear on the upper and lower parts of the crushing tooth is not the same. The lower part wears faster than the upper part. When the jaw crusher works, the crushing tooth plate is in direct contact with the material and withstands the great crushing force and the friction of the material. The role of crushing tooth plate life is directly related to the jaw crusher work efficiency and production costs, therefore, to extend the life of jaw crusher crushing tooth plate is particularly important. Extending the service life of jaw crusher jaw crusher can be considered in terms of design, material selection, assembly, and improvement during use.
At the time of design, the jaws of jaws and jaws should be peaked against the valley of teeth. In this way, when the material is broken, in addition to the extrusion effect, there is also a bending effect, and the material is relatively easy to break. In order to strengthen the service life of the crushing tooth plate, the crushing tooth plate of the small and medium-sized crusher is designed to be vertically symmetrical. When the lower part is worn, the adjustable head can be used. The crushing tooth plate of the large jaw crusher is designed to be symmetrical to each other. The crush plate can be replaced after wear. Chopping tooth plate material selection, in order to improve the service life of the crush plate, the material uses more than 12% manganese manganese steel, commonly used ZGMn13. Manganese steel has good toughness. Although its hardness is not high (about 210 HB), it is continuously hardened under pressure due to its cold working hardening characteristics. Therefore, it constantly wears and strengthens in the work until it wears out. Use only scrapped. There are also many new materials on the market, such as ZGMn13Cr2 and other alloy composite materials. Although these materials have higher prices, their service life is several times that of common manganese steel parts. Manganese steel crushing tooth plate must pass water toughness after casting. The operation of water toughening treatment is basically the same as quenching. That is to say, the cast manganese steel crushing tooth plate is heated to 1 000 ~ 1 100 °C and rapidly cooled in water. After the water toughening treatment, a uniform metallurgical structure can be obtained, and the metallographic structure can be fixed to avoid the natural phase change during use to deteriorate the performance.
