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.
machine models
Motor&Electrical Components:
1. Motor&Electrical Components equiped with "SIEMENS"
"MITSUBSHI" "CHINT",etc.
2. Imported PLC auto control,Safe, Seliable,Stable.
3. Patented design,energy conservation.
Rolls(Made by Dalian Bao Feng):
1. Made of chilled cast iron with vanadium and titanum alloys;.
2. Working surface Hardness:HS72±2
3. Rolls temperature and time control system:Imported PLC auto
control system.
Transmission System:
1. Hardened tooth-surface reducer, Compact structure.
2. Higher transmission efficiency.
3. Lower noise,Longer Service Life.
Humane Safety Design(Passed CE Safty certification):
1. Protective cover prevent operator's hands from rolling into the
roll.
2. Equipped with emergency device,provide safe and reliable
emergency stop.
3. Equipped with an overload protection device to prevent the major
components from being damaged due to overloading..
Base frame:
Whole casting framework,firm and durable,easy to installation
