Advantages and disadvantages of vibrating screen round hole screen and square hole screen: round hole screen is punching screen, which has high screening precision, is not easy to wear and has long service life, but the opening ratio of screen surface is low, generally 50%, effective The sieve area is small, the screening speed is slow, and the yield is low. In order to solve this problem, the sieve hole can be made into a conical shape with an enlarged bottom portion, that is, an inverted conical hole is formed, so that the sieve hole is gradually enlarged from the inlet to the outlet, which is advantageous for the material to be permeable. The mesh screen surface is a square hole screen, which is generally woven. Its opening ratio is high, up to 70% of the total screen area, the effective permeable screen area is large, the hole is not easy to be blocked, and the screening speed is fast and the yield is high. However, compared with the sieve plate, it is less robust, the mesh has a short life and is easily deformed, and the shape and size of the mesh holes after the deformation will change.
In addition to the nature of the material (grain size, shape, moisture, etc.), there are also structural parameters of the screen surface (screen width, length and mesh size, shape and opening ratio), and the sieve machine. Kinematic parameters (amplitude, number of vibrations n, screen inclination, etc.) and process parameters (such as productivity and layer thickness). When the structure of the sieved material and the sieve machine is determined, the factors affecting the screening efficiency of the sieve machine are amplitude λ, number of vibrations n, screen inclination angle α0, and productivity Q.