Construction waste screening principle
Screening is less than using a sieve material through the screen mesh of fine grained material surface, which is greater than the sieve hole extremely grain of material on screen and completing the process of the separation of coarse and fine grained material.The separation process can be considered by the material stratification and fine stick through sieve of two phases.Material stratification is the condition of complete separation. Fine sieve is the purpose of separation.Material screening process, material and surface with the appropriate relative motion, between material layer on the surface of the screen in a loose state, namely the material according to the particle size of layered, lead is located in the upper, threading a grain at a lower level, fine particle reaches the screen surface and through the mesh.At the same time. Make the wall materials and the sieve surface relative motion particles from the mesh on the mesh, is advantageous for the fine particle through the mesh.Fine particle through sieve is the premise of particle size smaller than the screen mesh, according to its through sieve the ease of fine particle can be divided into "easy to sieve grain" and "difficult to sieve grain"."Easy to sieve grain size smaller than the screen size 7 l three-quarters of particles, it is easy to through the formation of coarse grain clearance reached through sieve sieve surface;"Hard to sieve grain granularity is more than three-quarters of the mesh size particles, it is difficult to rent grain formed by clearance, and granularity, the closer the more difficult it is to thoroughly screen mesh size.Construction waste screening principle, the classification of the construction waste screening.
Classification of the construction waste screening
According to the screening shall complete the tasks in the process, screening operations can be divided into six types.
1. Independent screening its purpose is to get the final products conform to the requirements of the users.
2. Prepare screening its purpose is to prepare for the next job.
3. Preliminary screening before crushing screening, the purpose is to advance screening out qualified or not with broken ping products high work efficiency of crushing, prevent excessive broken and save energy.
4. Check the screen to sieve the broken products, also known as the control screen.
5. Select the useful screening using the material component distribution in each grade, significant differences for screening or the nature of homework.
6. Dehydration screening out the moisture in the material, it is often used for waste or desliming dehydration.