As we all know, the working conditions are more extensive, including the physical and chemical properties of the materials and their influence on the mixing equipment, whether the materials have special handling requirements during the mixing process, and the installation space of the mixer, etc. The degree of conditional restrictions is not the same, so it is difficult to have a clear standard. Here, we can only briefly analyze the effects of working conditions on the selection of mixers and their important structures:
1. For materials with different specific gravity, the mixing equipment has different structural strengths and powers, and the performance parameters such as the discharge gate, rotor, body and other structural forms and even the rotational speed are often different. It cannot be simply regarded as a local part. Enhanced or power scaling. For example, a ribbon blender hops generally adopts a double-headed double-belt wide ribbon, while a mixed iron-red powder is usually a single-layer staggered spiral ribbon, and the remaining structures of the two are also significantly different, and the rotational speed difference is also large.
2. For materials with finer grain size, special attention should be paid to the sealing of the production equipment, and the residual amount should be carefully considered. For example, when mixing flour with a two-axis paddle-free gravity mixer, it is desirable to use a 90° full-length large-opening door, a blown self-cleaning system, a cross-draw type discharge door and a shaft end gas seal structure for better assurance. Sealing and reducing the residue, in addition to the use of the upper bag to replace the return air duct, so as not to spray the fine flour from the return air pipe when mixing.
3. Multi-faceted consideration of the impact of other special physical properties on the selection equipment. For materials with poor fluidity or liquid addition, the coulter, flying knife, crushing roller and other mechanisms with strong shear mixing effect can be reasonably selected according to the specific conditions; the mechanism with faster wear should be wear-resistant or designed. It can be adjusted and replaced; the equipment that needs to be cleaned frequently due to material bonding should be provided with self-cleaning device and convenient and quick cleaning door; if the shape or particle state is not allowed to destroy the material, it is suitable to use the container rotary mixer. Mainly rely on convection mixing and diffusion mixing and mixing process softer equipment and so on.
4. For the mixing of materials that require heating or accompanying chemical reactions, in addition to selecting the appropriate material and temperature control structure, it is also necessary to pay attention to the influence of temperature changes on the equipment mechanism itself. For example, if the discharge door is used, the small door structure should be used. If the large door structure must be used, it is necessary to adopt a discharge structure such as a slanting type discharge door with automatic compensation capability to avoid the sealing of the discharge part due to thermal deformation. Reliability; At the same time, the equipment such as the main shaft and the rotor should be designed to take the necessary line expansion compensation measures.
5, the installation space is also a problem that often needs to be considered when choosing a hybrid device. For example, horizontal mixers are generally suitable for large-area and high-limit applications. Vertical mixers are the opposite. Vertical mixers are suitable for applications with small space, while gravity-free mixers and v-type mixers have the same specifications. Compared with hybrid equipment, the occupied space is generally much larger, but it also has the advantages of easy movement and convenient layout.
Of course, in addition to the installation size of the mixer itself, reasonable on-site layout and installation methods can effectively improve the installation space conditions of the mixer. When selecting a mixing device, it is rare to determine the mixer type based solely on the mass of the mixture obtained in a series of independent experiments.
In general, the compatibility of the process with the quality of the mixture and the type of mixing equipment is considered. The initial selection is to first eliminate the incompatible mixing equipment. These compatibility mainly refers to the following:
1. Purity of the product In many industrial processes, the purity of the product is important. To avoid contamination between batch operations, the mixing equipment must be thoroughly cleaned after each use. In order to adapt to this condition, the internal shape of the mixer should be smooth, indicating that high-precision polishing should be performed and that the cleaning operation should be easy. To avoid possible contamination of the lubricant, the bearings and seals should not be in direct contact with the mixture or placed on top of the mixture. Tumbler mixers—commonly known as double cone mixers, V-type mixers, two-dimensional motion mixers—can meet all of the above requirements, have a simple shape, and have no contact with the rotating part inside the mixer. The low-speed convection mixing equipment with complex impellers not only has cleaning problems, but also all convection mixing equipment has the possibility of contact with lubrication and lubrication, such as horizontal ribbon mixers, conical mixers, etc. In addition, many mixers are not suitable for processing environments where product specifications change frequently and require thorough cleaning.
2. When selecting the mixer's airtight mixer, in addition to considering the product that can provide high purity, it must also consider environmental issues such as dust spillage and environmental pollution. From a health, safety and economic point of view, dust spillage should be minimized and the powder should be sealed in a closed mixing vessel. However, when feeding and unloading operations, the closed container must be opened. At this time, some fine dust will overflow and diffuse into the surrounding air. Corresponding measures should also be taken to minimize pollution.
1. For materials with different specific gravity, the mixing equipment has different structural strengths and powers, and the performance parameters such as the discharge gate, rotor, body and other structural forms and even the rotational speed are often different. It cannot be simply regarded as a local part. Enhanced or power scaling. For example, a ribbon blender hops generally adopts a double-headed double-belt wide ribbon, while a mixed iron-red powder is usually a single-layer staggered spiral ribbon, and the remaining structures of the two are also significantly different, and the rotational speed difference is also large.
2. For materials with finer grain size, special attention should be paid to the sealing of the production equipment, and the residual amount should be carefully considered. For example, when mixing flour with a two-axis paddle-free gravity mixer, it is desirable to use a 90° full-length large-opening door, a blown self-cleaning system, a cross-draw type discharge door and a shaft end gas seal structure for better assurance. Sealing and reducing the residue, in addition to the use of the upper bag to replace the return air duct, so as not to spray the fine flour from the return air pipe when mixing.
3. Multi-faceted consideration of the impact of other special physical properties on the selection equipment. For materials with poor fluidity or liquid addition, the coulter, flying knife, crushing roller and other mechanisms with strong shear mixing effect can be reasonably selected according to the specific conditions; the mechanism with faster wear should be wear-resistant or designed. It can be adjusted and replaced; the equipment that needs to be cleaned frequently due to material bonding should be provided with self-cleaning device and convenient and quick cleaning door; if the shape or particle state is not allowed to destroy the material, it is suitable to use the container rotary mixer. Mainly rely on convection mixing and diffusion mixing and mixing process softer equipment and so on.
4. For the mixing of materials that require heating or accompanying chemical reactions, in addition to selecting the appropriate material and temperature control structure, it is also necessary to pay attention to the influence of temperature changes on the equipment mechanism itself. For example, if the discharge door is used, the small door structure should be used. If the large door structure must be used, it is necessary to adopt a discharge structure such as a slanting type discharge door with automatic compensation capability to avoid the sealing of the discharge part due to thermal deformation. Reliability; At the same time, the equipment such as the main shaft and the rotor should be designed to take the necessary line expansion compensation measures.
5, the installation space is also a problem that often needs to be considered when choosing a hybrid device. For example, horizontal mixers are generally suitable for large-area and high-limit applications. Vertical mixers are the opposite. Vertical mixers are suitable for applications with small space, while gravity-free mixers and v-type mixers have the same specifications. Compared with hybrid equipment, the occupied space is generally much larger, but it also has the advantages of easy movement and convenient layout.
Of course, in addition to the installation size of the mixer itself, reasonable on-site layout and installation methods can effectively improve the installation space conditions of the mixer. When selecting a mixing device, it is rare to determine the mixer type based solely on the mass of the mixture obtained in a series of independent experiments.
In general, the compatibility of the process with the quality of the mixture and the type of mixing equipment is considered. The initial selection is to first eliminate the incompatible mixing equipment. These compatibility mainly refers to the following:
1. Purity of the product In many industrial processes, the purity of the product is important. To avoid contamination between batch operations, the mixing equipment must be thoroughly cleaned after each use. In order to adapt to this condition, the internal shape of the mixer should be smooth, indicating that high-precision polishing should be performed and that the cleaning operation should be easy. To avoid possible contamination of the lubricant, the bearings and seals should not be in direct contact with the mixture or placed on top of the mixture. Tumbler mixers—commonly known as double cone mixers, V-type mixers, two-dimensional motion mixers—can meet all of the above requirements, have a simple shape, and have no contact with the rotating part inside the mixer. The low-speed convection mixing equipment with complex impellers not only has cleaning problems, but also all convection mixing equipment has the possibility of contact with lubrication and lubrication, such as horizontal ribbon mixers, conical mixers, etc. In addition, many mixers are not suitable for processing environments where product specifications change frequently and require thorough cleaning.
2. When selecting the mixer's airtight mixer, in addition to considering the product that can provide high purity, it must also consider environmental issues such as dust spillage and environmental pollution. From a health, safety and economic point of view, dust spillage should be minimized and the powder should be sealed in a closed mixing vessel. However, when feeding and unloading operations, the closed container must be opened. At this time, some fine dust will overflow and diffuse into the surrounding air. Corresponding measures should also be taken to minimize pollution.
Rf Deactivator ,Rf Label Deactivator,Eas Rf Deactivator,Rf Integrated Deactivators
WENZHOU BOSHINE ELECTRONIC SECURITY CO.,LTD , https://www.boshine.com