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The work condition of crushing-screening equipment is poor. As one of the most important parts of the screening equipment, the vibrating screen surface is the foundation of screening equipment, which suffers the impact from the ore unloading, the ore load and the vibration (including the reverberation). It is not only screening equipment, but also conveying equipment, which conveys the materials on the screen.
The impact plate adjusting system as well as overload protect device for the whole machine, can work when foreign materials enter into impact crusher. Impact plate can be bounced again and let foreign materials go, so that it prevents iron block or other uncrushable material doing damage to crusher.
Hammer plate of impact crusher is fixed tightly to fixed rotor, therefore, the moment is small when starting machine. It is easy to control rotor balance performance, and there are little disturbing force during operation. That ensures smoothly start. Usually, the steel screen plate is made of the low carbon steel plate, and the bars screen netting is made of the bars. Then they are welded in the screen box. This kind of screen surface has low abrasion resisting properties. In order to improve the work life of screen surface, the thickness of the steel plate and the diameter of the bars are often increased. However, this method will decrease the aperture ratio of the screen surface and make the screen hole be blocked easily, which reduces the efficiency of screening. In addition, the heavy screen surface will make the installation and unloading uneasy and influence the quality of the machine. For the welding rods screen surface, due to the overheated welding parts and the existence of internal stress, the screen surface often fractures along the welding point.
Driving system of impact crusher adopts motor + mechanical coupling of sand making machine +V belt + Crusher, which can effectively improve the motor starts performance, enabling the motor to run smoothly and start. Belt transmission mode plays role of double overload protection function. Drive system requirement to motor is low power, and it significantly reduces running costs. This drive method is an economical and practical, good performance, high quality, safe and reliable driving scheme.
It is better for the thickness of the screen plate being less than 12.5mm. The screening efficiency of rectangular mesh screen is higher than the screening efficiency of round-hole screen. What’s more, it is better to use star arrangement for the round-hole screen.
PFW series impact crusher developed by Hongxing Mining Machinery Company, is available to all kinds of soft, medium and hard material crush. Now it is specially applied to metallurgy, mining, cement, chemical industry, refractory and ceramic industries, as well as used in highway construction, water projects, such as building rubble, sand processing areas. The appearance design is unique, which makes a breakthrough trail ever before. Besides, Hongxing mining machine will depend on market demands to create new type machine with more features and satisfactory to users.

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