1. Analysis of particle size distribution of materials before screening
Particles generally refer to a section of 4 to 200 mesh. Therefore, according to the 4 - 200 mesh screens for analysis, the screens are:
| Screen number | Screen size (mm) | Screen number | Screen size (mm) | Screen number | Screen size (mm) |
| 4 mesh | 4.75 | 5 mesh | 4.00 | 6 mesh | 3.35 |
| 7 mesh | 2.80 | 8 mesh | 2.36 | 10 mesh | 2.00 |
| 12 mesh | 1.70 | 14 mesh | 1.40 | 16 mesh | 1.18 |
| 18 mesh | 1.00 | 20 mesh | 0.85 | 25 mesh | 0.71 |
| 30 mesh | 0.60 | 35 mesh | 0.50 | 40 mesh | 0.425 |
| 45 mesh | 0.355 | 50 mesh | 0.300 | 60 mesh | 0.250 |
| 70 mesh | 0.212 | 80 mesh | 0.180 | 100 mesh | 0.150 |
| 120 mesh | 0.125 | 140 mesh | 0.106 | 170 mesh | 0.090 |
| 200 mesh | 0.075 | 230 mesh | 0.063 | 270 mesh | 0.053 |
The screen holes are doubled every four mesh counts, that is, the product size is doubled every four particle size numbers. According to the requirements of the production order, a particle size distribution analysis is performed before screening. step:
(1) Weigh a certain weight of material. The more materials, the higher the relative accuracy;
(2) According to the model of the test sieve vibrating machine, select the corresponding number of screens at a time. Screens generally start with a low mesh (4 mesh) and are arranged step by step. Recording the corresponding weights of the corresponding meshes;
(3) After all the sieves from the 4 mesh to the 200 mesh screen are completed, the proportion of each particle size distribution of the materials is calculated. Probably assess production efficiency and progress based on this material particle size distribution.
2. Arrange the production screen according to the actual situation
In the production process, see: 4-8, 8-16, 16-16, 26-40, 40-70, 70-120, 120-200, 200 to be fine. For example, a certain particle size requirement is that the content of a sieve cannot exceed 5%, and the content of a sieve cannot exceed 10%. This kind of particle size is generally referred to as segment sand, sand of a certain size segment (from how many meshes to how many meshes). There is also a single-grain number requirement, such as 8 mesh, which is an item that passes through an 8-mesh screen and does not pass through a 10-mesh screen.
In the order, the customer gives the purchase order often not to place the order according to the broken particle size distribution. There may be a large number of meshes and a small number of meshes. Under the premise of not affecting the quality of delivery, appropriate adjustments can be made in the screen discharge.
For example, the 26-40 product is as follows: the requirement is that the 26 mesh sieve can not exceed 5%, and the 40 mesh sieve can not exceed 10%. According to the normal screen layout, the upper screen is 26 mesh, the lower sieve is 40 mesh, and the middle is the product. The product size distribution done in this way is very good. The particle size distribution is too good, directly affecting the yield of this grain size. It is better to modify it to: 24 mesh on the upper screen and 45 mesh on the lower screen. Such particle size distribution does not affect the product quality requirements. The output of production has also increased accordingly.
The wrong number of screens is the simplest and most effective way to improve a certain size number. Some people will say that the market only sells on a standard screen. In fact, these screens can be called screen manufacturers to help produce non-standard screens. For example, the 30-mesh screen may be 31 mesh, 32 mesh, 33 mesh, 34 mesh or 29 mesh, 28 mesh, 27 mesh, 26 mesh, and the like. Arrange the screen according to actual needs. Other orders are like this. This solves the practical problems of many particle sieving.
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