A twin-shaft paddle non-gravity mixer uses convective mixing to distribute materials throughout a mixing chamber. Its main components include a horizontal cylindrical chamber, two shafts fitted with counter-rotating paddles, replaceable auxiliary blades, and a pneumatic flap valve.
Working principle
Convective mixing
Two shafts rotate in opposite directions inside the horizontal chamber. The paddles are arranged at specific angles to move materials through the chamber and promote mixing. Their combined movement creates continuous material circulation, helping distribute the materials throughout the batch.
Material circulation
The paddles move materials along the axial direction of the shafts and circulate them radially. This movement lifts and throws the materials, creating a transient weightless state during part of the material's trajectory. The repeated lifting, falling, and redistribution of materials promotes uniform mixing.
Multidirectional mixing
The centrifugal forces generated by rotation, together with the angled paddle arrangement, drive materials through repeated circulation paths. The materials move in different directions rather than remaining in one mixing zone, allowing the mixing action to extend throughout the chamber.
Solid-liquid mixing
A liquid spray port can be installed to introduce liquid into the chamber while the solid materials are being mixed. This allows the equipment to handle solid-liquid mixing processes, subject to the requirements of the materials and production process.
Structural features
Counter-rotating shafts and paddles
The two rotating shafts are the main mixing components. Their paddles rotate in opposite directions and move materials both axially and radially, creating the circulation required for convective mixing. The paddle angles and arrangement determine how the materials move through the chamber.
Replaceable auxiliary blades
The paddle blades use a two-piece design with a movable auxiliary blade between the sections. This arrangement allows the smaller blade to be replaced when necessary, reducing the cost of replacing worn mixing components and simplifying maintenance.
Pneumatic flap valve
The discharge valve fits closely against the inside wall of the mixing chamber. This helps reduce material buildup and mixing dead zones around the discharge area. The large discharge opening allows materials to leave the chamber quickly, with relatively little residue remaining inside.
Rotational speed control
The mixer operates at a rotational speed between 50% and 80% of the critical speed. Maintaining this range is intended to support the mixing process while avoiding excessive agitation that may increase wear. Actual operating settings should follow the requirements of the specific equipment and material.
Custom machining for industrial equipment
In addition to components used in mixing equipment, we provide custom precision machining for non-standard industrial parts based on customer supplied drawings. Hansheng Automation also manufactures precision components for filling machinery and tobacco packaging equipment, as well as parts for yacht equipment and remote control racing cars. The machining requirements are determined by the supplied drawings and the dimensional and structural specifications of each component.
