1) constituting the adhesive sealing the end of the cylinder seal assembly located downstream of the water seal plate, mainly by the reverse spiral sleeve and split cooling water jacket composition. Cooling water jacket made of elastic bolts installed on the mixer drum, so that a mixing machine in thermal expansion or rotor bending deformation, the cooling water jacket can float, this floating feature ensures that you can always reverse spiral sleeve of the cooling water Centre jacket, more conducive to seal.
2) The primary seal in the form of a viscous sealing mechanism is anti-adhesive sealing screw seal, orientation to force material back, the sealing effect depends on the speed of reverse spiral sleeve, head count and it spiral sleeve coat size of the gap, in addition to have the ability of the molten resin flowing outwardly. First, the rotational speed of the sleeve is the reverse spiral rotor speed, usually the same; the gap size of the second coat it, though not high rotor speed (high gear 340r / min, low gear 240r / min), but taking into account cooling Floating adjustment range and resin lubricating water jacket, diameter size is generally set at a gap of about 2mm; the third is the issue number of screw head, due to the large gap between the sleeve and the reverse spiral cooling water jacket, although mainly through the molten resin surging outward spiral groove, but the larger the gap, but also have to consider the outward leakage through the gap, and the use of multi-spiral inward to quickly push back the molten resin will not easily leak; fourth is the outermost a seal, that is appropriate to reduce resin temperature change of molten resin flowing outward, when the temperature of the molten resin is here reduced to a certain extent, the molten resin viscosity increases, even partial curing resin hamper surging outward, and reverse spiral sets common constitute a seal.
In addition there are two things on the sealing is equally important:
Cooling water temperature can not be reduced indefinitely, which would lead to a large area of ??sealing a resin solidification, increased electrical power, increased wear of the seal (and there will be fine fly), the impact of machine cycles run leader. Control the cooling water temperature depends on the viscosity of the resin, the dynamic sealing gap and heat capacity of the cooling water jacket; the molten resin flowing outward along the spiral groove between the gap, but also can play a lubricating role to play adjust the position of the role of the water jacket.
Possibility and reason 3) failure of the first adhesive sealing, frozen cold water temperature caused by excessive leakage spot. Second, the cooling water temperature is too low, after long time operation cause wear of the seal leakage. Third, the cooling water jacket oval, resulting in a viscous seal failure, by reducing the water temperature can try temporarily prevent leakage, waiting for an opportunity to replace. Due to the cooling water jacket is embedded pipeline castings, the case has not been completely eliminated, including stress machined, finished parts will cause deformation occurs after a period of time, affecting the sealing effect.
The significance of the anti-anti-helix spiral sealing sleeve and the sealing lip seal and purge nitrogen gas used in conjunction to solve the powder seal the harsh operating environment issues. Anti-sealing sleeve and floating spiral cooling water jacket is constructed to solve the problem after sealing the leak is difficult to handle molten resin, mature sealing technology allows us to manage on a device in a favorable position to ensure smooth production run.
