Open Rubber Mixing Mill of Two Roll Mill Qingdao Supplier

Open Rubber Mixing Mill of Two Roll Mill Qingdao Supplier
 


Machine Overview:
Two roll Mixing Mills are designed to ensure perfect and uniform blending of natural and synthetic rubber with other raw materials. These mills provide uniform mixing of the material to the desired level. Most of the mixing mills are driven by electronic motor and different models have different output


Main features:
Roll bearing
Two rigid pillars with removable tops carry the rolls, which are placed either in friction/bush bearings or high quality anti-friction roller bearings. Roller bearings are pretty much standard nowadays, as they allow for 20 - 30 % in power-savings. A lubrication system is no longer required.
Roll nip setting

Adjustment of the front roll used to be made by hand (manual by ratchet) or later motorized by worm gear.
Nowadays hydraulic pistons adjust the rolls and also protect rolls from high forces that can build up in between the rolls (roll safety). They also open roll gap immediately when pushing the safety bar in front or back in case of emergency (required by European Safety standards CE).
Rolls

A mixing mill has 2 horizontal rolls set up back to back. They are made of ground chilled cast iron, with surface hardness ranging from 475 - 520 HV (Vickers hardness) up to 520 - 580 HV (or 68 - 72 HSD). The depth of hardened layer ranges from 10 to 16 mm.
Rolls are made with a central bore for cooling through a spray-type lance (low cost type cooling) or peripheral drills, where bores are closer to the surface for better cooling and more equal distribution.
The rotary joints connected to the spraying lance are supplied from tempering units to provide constant temperature during the mixing process.
Material Guides or Compound guides
At the ends of the roll faces the roll nip is being limited by the compound guide cheeks. The compound guide cheeks of split design with "centre tongue" avoid lateral escape of compound from the working area in any case.
Friction
The standard drive provides fixed speed and fixed friction ratio. The front roll typically runs slower than the back roll. Depending on the compound mixed the friction can range from 1:1.1 for a standard mixing mill, 1:1.25 for silicone or plastics mills, 1:1.8 for breaker mills for new rubber, 1:2.5 for refiner mills with narrow gap of 0.05 mm, up to 1:3.2 for breaker mills for old rubber. A variable speed motor on each roll is required for infinitely variable friction ratio.
Technical Parameters
Machines pcitures show:





Contact:Stephanie 
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