Can the Rotary Arch-Breaker Machine be used to break arches in high-viscosity materials ?
Rotary Arch-Breaker Machine can be used to break arches of high-viscosity materials, but it requires targeted optimization of structural design and parameter configuration. The core is to overcome the characteristics of strong adhesion and poor fluidity of materials. The specific implementation methods are as follows:
1. Characteristics of high viscosity materials and difficulties in breaking arches
High-viscosity materials (such as wet clay, gypsum slurry, syrup, etc.) usually have the characteristics of repose angle>55°, internal friction coefficient>0.8, adhesion work>20mJ/m², and are prone to form hardened arches and double blockages of adhesion walls in the silo. Traditional arch breaking methods (such as vibration and air blowing) are difficult to effectively destroy the cohesion of materials, while rotary arch breaking machines need to achieve arch breaking through the synergistic effect of mechanical shearing + flexible disturbance + interface separation.
2. Key technologies for adapting to high-viscosity materials
Biaxial counter-rotating structure enhances shear
It uses counter-rotating dual spindles (speed difference 3-5rpm ) and staggered blades (overlap rate 30% ) to break the bonding structure through shear stress ( ≥1.5 times the shear strength of the material). For example, when processing clay with a moisture content of 25% , the shear rate of the dual-axis arch breaker can reach 12s⁻¹ , which is 2 times higher than that of the single-axis model .
Anti-stick knives and surface treatment
Tool material: Use stainless steel tools with silicon nitride coating (hardness HV1800, surface energy <20mN/m), contact angle >110° to reduce material adhesion.
Structural design: It uses a variable pitch spiral cutter (the pitch changes gradually from 300mm at the top of the bin to 150mm at the bottom of the bin), which gradually increases the extrusion force during the downward pushing process. Combined with the serrated design of the tool edge (tooth depth 5mm), it achieves the triple effects of "cutting - extrusion - peeling".
Auxiliary fluidization and temperature control
Air pressure assistance: A pulse airflow nozzle (air pressure 0.4-0.6MPa, pulse frequency 5Hz) is set on the back of the tool to reduce adhesion by using air-solid interface slip, which is especially suitable for syrup materials.
Temperature regulation: For high-viscosity materials that need to be heated (such as hot melt adhesive), a jacketed tool can be configured (with heat transfer oil introduced and temperature control accuracy of ±2°C) to reduce the material viscosity from 10,000 cP to below 3,000 cP, and reduce the arch breaking energy consumption by 35%.
3. Application cases and effect verification
When a food company was processing high-viscosity pectin (viscosity 8000cP, water content 60%), the traditional single-axis arch breaker had to be shut down and cleaned every day due to severe adhesion. After switching to a dual-axis anti-stick rotary arch breaker:
Structural parameters: spindle spacing 200mm, tool surface sprayed with Teflon (thickness 50μm), equipped with a bottom annular airflow nozzle (aperture 2mm).
Operation effect: Arch breaking time was shortened from 45 minutes to 12 minutes, adhesion amount was reduced by 90% , continuous operation for 72 hours without cleaning, energy consumption was 1.2kW・h/t material ( 40% lower than before the transformation ).
4. Limitations and precautions
Upper limit of viscosity: The applicable viscosity range of the rotary arch breaker is usually ≤15000cP. For ultra-high molecular weight polymers (such as silica gel), a pre-crushing device is required.
Moisture content threshold: When the moisture content of the material is greater than 70%, a "muddy" flow may form and a stirring arch-breaking device must be used instead.
Wear control: When the high-viscosity material contains impurities (such as slurry containing quartz sand), the tool needs to be checked for wear regularly (it is recommended to check the blade thickness every 500 hours), and the tungsten carbide cladding layer (hardness HV1600) should be replaced if necessary.
Conclusion: Through the combination of biaxial shearing, anti-sticking surface, airflow assistance and other technologies, the rotary arch breaker can effectively meet the arch breaking needs of high-viscosity materials with viscosity ≤15000cP, especially in the food, chemical and building materials industries. However, the key components need to be customized according to the specific characteristics of the materials.
If you need high quality Rotary Arch-Breaker Machine , please contact Changrong for more questions.
