BTMA- How to extend the service life of the crusher

When the crusher is working, the wear speed of the upper and lower parts of the crushing plate is different. The lower part wears faster than the upper part. When the crusher is working, the crushing plate is in direct contact with the material and bears the 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, it is particularly important to extend the service life of the crushing plate of the jaw crusher.

The jaw crusher is composed of a movable jaw and a fixed jaw. The crushing force it bears and the friction of the material are easily worn out. In order to protect the jaw plate, wear-resistant lining plates are generally installed on the surface of the movable and fixed jaws. The board is also called the broken board.

In production, the crushing plate acts directly on the material, and the crushing force is very large, especially when crushing materials with high hardness, it will cause the bolts of the crushing plate to vibrate and the nuts to loosen, which will aggravate the wear of the crushing plate and generate great noise. If the board falls off or breaks, the equipment shuts down and affects normal production.

Generally, fine and uniform crystal grains, spherical carbides and uniform distribution, are all conducive to improving rolling contact fatigue life. After the bearing steel is processed, the more retained austenite and the coarser the acicular martensite, the lower the beneficial residual compressive stress and the strength of the carburized layer on the surface, and the easier it is for microcracks to occur. Under the same condition of the undissolved carbide state, when the mass fraction of carbon in martensite is about 0.4% to 0.5%, the strength and toughness of the material are better matched, and the contact fatigue life is long. For the undissolved carbides, through appropriate heat treatment, it tends to be small in volume, small in size, and uniformly distributed, avoiding the appearance of coarse or band-shaped carbides, which are all conducive to fatigue cracks. As the hardness increases within the range, its contact fatigue resistance will increase accordingly. In addition, it is also important to match the surface hardness of the two contact rolling elements.

The surface roughness of the liner. Appropriately reducing the surface roughness of the liner is the way to improve the resistance to fatigue and wear. The required level of the surface roughness of the liner is related to the contact stress on the surface of the liner. Usually, the liner is required to be exposed to fire or high surface hardness. The surface roughness of the board is low.