To Improve the Mixing Quality of The Mixer, The Following Key Measures Must Be Taken

For the entire feed processing production line, in order to obtain satisfactory quality compound feed in the finished product warehouse, the mixing uniformity of the feed must meet the standard requirements, in addition to the structure and technical parameters of a machine that meets the process requirements, it can be used in a short time. In addition to the mixer with satisfactory mixing uniformity, the reasonable arrangement of the front and rear procedures and the reasonable use of the mixer itself are all decisive factors. Here are some measures shared by the Mixer Supplier, I hope it will be helpful to you!

Mixer

1. Fullness factor

Regardless of the type of Mixer, proper charging conditions are the prerequisites for the mixer to work normally and obtain the expected mixing effect.

Among the batch mixers, the filling factor of the horizontal ribbon mixer is between 0.6 and 0.8, and the maximum material level cannot exceed the top surface of the rotor; the filling factor of the batch vertical mixer is generally controlled at 0.8 to 0.85; The full factor of the shaft or double-shaft blade high-efficiency mixer is 0.8-1. When the bulk density of the material is greater than 0.6, it is calculated according to the mixing quantity of each batch; when the bulk density of the material is less than 0.6, it can be calculated in the bulk density range.

2. Operation sequence

The various vitamins, pharmaceuticals and other additives or concentrates in the feed that are less in content need to be diluted with a carrier before entering the mixer to make a pre-mix, and then they can enter the mixer together with other materials.

In the order of feeding, generally the components with large proportions are added first or most of them are added into the machine, and a small amount and a small amount of components are placed on the material. Among various materials, those with larger particle size are generally added to the mixer first, while those with smaller particle sizes are added later. The density of materials will also vary. When there is a large difference, the materials with a small degree of densification are generally concentrated first, and then the materials with a high degree of densification.

3. Mixing time

For continuous mixers, this problem does not exist, but for batch mixers, it is very important to determine the mixing time for the quality of the mixture:

① If the mixing time is too short, the material will be discharged without being fully mixed in the mixer, and the mixing quality of the product will definitely be affected;

②If the mixing time is too long, the materials will be mixed in the mixer for a long time, which will not only increase the energy consumption and decrease the output, but also cause the separation and accumulation of the components due to excessive mixing, which will reduce the uniformity of the mixing.

The determination of the mixing time depends on the mixing speed of the mixer, which is mainly determined by the type of the mixer. For example, the horizontal ribbon mixer, whose mixing effect is mainly convection, moves the materials from one place of the pile to another, and can quickly achieve rough lumpy mixing. Therefore, the mixing time with this mixer is relatively short. Usually 2 to 5 minutes per batch, the length of time depends on the nature of the raw materials, such as moisture content, particle size, fat content, etc. For a dual-shaft high-efficiency mixer that mainly uses shear and convection mixing, the mixing uniformity requirement is generally reached within 40-60s, and the mixing cycle is shorter.

4. Try to avoid separation

The mixture of solid particles has dynamic characteristics. Even when the material is obviously in a static state in the bin or bag, the particles of the material are still in constant relative motion. Any fluid powder has a tendency to separate.

There are two reasons for the separation: one is that when the material falls on a pile, larger particles will roll under the pile due to their greater inertia, while small particles with smaller inertia may be embedded in the cracks on the pile. It's just that when the material is vibrated, the smaller particles tend to move to the bottom, and the larger particles tend to move to the top. The second is that when the mixture is blown or fluidized, it separates according to the difference in particle size and density.

To avoid separation, the following four methods are used:

① Strive to have the same particle size of the various components of the mixture, and also use the method of adding liquid to avoid separation.

②Master the mixing time and do not over-mix. It is generally believed that the materials should be discharged before the uniformity of the mixing is approached, and the mixing should be completed by the transportation or transfer process.

③Reduce the loading and unloading work after mixing to a minimum. The smaller the material falling, rolling or sliding, the better.

④ Press the material into granules immediately after mixing, so that the mixture is granular.

5. Regular inspection

After the mixer has been used for a long time, the door sealing strip will suffer from aging and wear. The operator should regularly check the door of the mixer for leaks. If the door body leaks, it should be checked and repaired in time, and related vulnerable parts should be replaced.

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