Anchor frame mixer
Anchor type low-speed rotation and shear force prevent settlement, suitable for high viscosity liquids. Attention should be paid to distinguishing between anchor type and frame type, which belong to the same category and are collectively referred to as anchor frame type. Structurally, the ratio of impeller diameter to tank diameter is relatively large, usually between 0.7 and 0.9, and even higher at high viscosity. Anchor frame type is a common type and widely used, accounting for over 75% of the market. In terms of application scenarios, prevent materials from adhering to the tank wall. In terms of price, a comparison was made between anchor frame style and screw belt style. Anchor frame style has a lower cost, but the mixing effect may be slightly inferior and needs to be selected according to demand. Technical parameters such as rotational speed are usually between 10-70rpm, which reduces shaft shaking at low speeds and is suitable for high viscosity. The connection method is similar to a paddle type, fixed with bolts. In terms of combination use, it can be combined with multiple layers of turbines or added with a scraper to improve heat transfer. In terms of materials, stainless steel material may require corrosion resistance. The material was not specifically mentioned in the user issue, but it may need to be briefly mentioned.
Comprehensive analysis of anchor frame agitator
1, Structure and Design
Basic Structure
The anchor frame mixer is composed of a metal frame (such as stainless steel), with a main body shape usually rectangular or circular, and is attached to the inner wall of the tank. The bottom is designed to fit an elliptical tank or a middle bottom bearing 14. The ratio of impeller diameter to tank diameter is relatively large, with a suitable ratio of 0.7~0.9 for low viscosity liquids and 0.8~0.95 for high viscosity liquids.
Blades and Drive
The types of blades include flat blades, folded blades, or scraping blades, which are fixed to the mixing shaft by bolts and connected in a similar manner to a propeller. The drive system consists of a motor and a reducer, with a typical speed of 10~70rpm, suitable for high viscosity materials.
2, Characteristics and advantages
Shear force and anti settlement
When rotating at low speed, it can generate significant shear force along the tank wall, effectively preventing material settling or adhesion, and promoting fluid exchange inside the tank.
Economy and Applicability
Compared with the ribbon mixer, the anchor frame mixer has a lower cost (about 2/3 of the ribbon mixer) and is suitable for scenarios where mixing efficiency is not high. But there may be a mixing dead zone near its axis, which needs to be improved by combining deformed impellers or multi-layer turbine combinations.
3, Application scenarios
Typical fields
Mixing and heat transfer of high viscosity fluids such as polymers, colloids, and high concentration slurries.
Crystallization operation: Reduce crystal adhesion and improve heat transfer efficiency by low-speed scraping.
Solid liquid mixing: prevent solid settling and maintain uniform temperature inside the tank.
Industry Applications
Commonly found in industries such as chemical, food, and pharmaceutical, especially in reaction vessels that require low cost and large stirring capacity.
4, Technical parameters and selection
Key parameters
Speed range: 10~50rpm (high viscosity) or 50~70rpm (low viscosity).
Material selection: Stainless steel (304/316L) is the main material, with strong corrosion resistance.
Suitable tank type: elliptical or circular tank body with small gap with the tank wall (conducive to heat transfer).
Selection suggestions
Single anchor or combination type (such as anchor belt MDS) should be selected based on material viscosity, mixing requirements, and cost budget.
If you need to eliminate the mixing dead zone, you can pair it with a turbine impeller or add a scraper.
5, Limitations and improvements
Mixing efficiency limitation
In high viscosity fluids, flow blind spots are prone to form in the vicinity of the shaft, which require optimization through deformation impellers or forced extrusion flow design.
Alternative solutions
When high requirements are placed on the mixing effect, a ribbon mixer can be used, but its cost is higher.
The above content combines the core characteristics and applicable scenarios of anchor frame mixers
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