Date: Nov. 16, 2020
In crushing, sand making, and ore dressing production, the screening process is indispensable equipment, and the screening equipment is also diverse. This article introduces the characteristics of 8 kinds of screening machines in detail, and the screening equipment suitable for different links in the sand and gravel production line. Commonly used screening equipment mainly includes the vibrating screen, fixed screen, roller screen.
A fixed screen is a screening machine with a fixed screen surface. It is placed obliquely and the material is tilted at the high end. Without any external force, the ore is passed through the sieve by its weight and divided into under-screen material smaller than the sieve hole and over-screen material larger than the sieve hole. Two levels of granularity.
The screening efficiency of the fixed screen is low, it is easy to be blocked when the viscous water content is high, and the operation is labor-intensive. However, because of its simple structure, easy manufacture, no power, and low cost, it is widely used in crushing operations. It can be divided into two types: grid sieve and strip sieve.
1). Grid screen: mostly used in the upper part of the raw ore receiving bin and coarsely crushed ore bin, mainly used to control the particle size of the ore.
2). Bar screen (bar screen): mostly used for pre-screening before coarse crushing and medium crushing.
The screen surface of the roller screen is composed of many parallel rollers with sieve discs staggered on them. The gap between adjacent rollers and discs is the sieve hole of this kind of sieve. The roller is driven by a sprocket or gear to rotate, and its rotation direction is the same as the material flow direction.
Roller screens are often used for screening coarse-grained materials. They are suitable for screening soft and medium-hard materials. Its advantage is that it does not block the screen. The disadvantage is that the equipment is bulky, the screening efficiency is low, and the roller wears quickly.
The commonly used mine vibrating screen is not a kind of screening equipment, but a kind. Usually, there are inertial vibrating screens, self-centering vibrating screens, eccentric vibrating screens, heavy-duty vibrating screens, circular vibrating screens, linear vibrating screens, etc. Below we focus on comparing the characteristics of these types of vibrating screens.
Section one screening: fixed screen (low screening efficiency, low equipment investment), heavy-duty vibrating screen (high screening efficiency, high equipment investment), roller screen (medium screening efficiency, high equipment investment).
Section two screening: circular vibrating screen (high screening efficiency, low equipment investment), linear vibrating screen (medium screening efficiency, low equipment investment).
Section three screening: circular vibrating screen (high screening efficiency, low equipment investment), linear vibrating screen (medium screening efficiency, low equipment investment).
Inspection and screening: circular vibrating screen (high screening efficiency, low equipment investment), linear vibrating screen (medium screening efficiency, low equipment investment).
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