Analysis mixer rotor sealing system

Today, including the production of various components of the rubber compound is mainly used for the mixer . Mix including a polymer , the fine powder filler spread easily , carbon black , calcium carbonate and a small amount of chemicals such as vulcanizing agents , accelerators , or processing aids and a liquid oil component such as plasticized . These liquids and fine powder components are sealed by means of a rotor mixer control system in order to limit their access to the external environment .
Initially , it is easy to distribute these minor ingredients are processed through the film adhesion , called bonding . As the mixing chamber pressure is high , the paste along the rotor shaft is slowly squeezed out. In order to limit the outflow of the paste , both ends of the rotor shaft seal added .
Itself comprises two ring seals , usually in the region having a hard sliding surface . One fixed on the rotor shaft , the relative one rack-mounted . Each rotor sealing system is essentially the difference between the applied surface pressure , divided into automatic rotor seal (SSA), spring - loaded rotor seal (GA) and a hydraulic rotor seal (WYH).
Dustproof design
SSA sealing principle is based on the use of the mixing chamber pressure . If the mixing chamber pressure increases, the pressure will be transmitted to the sliding ring, which seals the locking force will increase . Minimal surface for the application of pressure , the use of disk spring assembly to the internal pressure of the slip ring to the outer fixing ring. Today, a new mixer are equipped with GA and WYH rotor seal system .
In the spring - loaded rotor seal (GA) system , Fixed Length plastic seal located mixing outdoors. Here , the inner ring fixed to the frame , the outer rotating ring fitted to the rotor shaft . Through several ring arranged around the rotary disc spring assembly surface pressure is applied through the pre- pressure of the spring nut . Lubricating plasticizer injection seals the annular gap , will easily spread by some fine bonded rubber components . Deeper lubrication hole in the slide ring fixed to lubricate sliding surfaces.
Rotor seal the water pressure (WYH) case , the sealing position closer to the rotor , in the end of mixing chamber inside the rack . Rotary slip ring fixed to the inner rotor shaft. Through the outer ring with clamping yoke sleeve . The contact pressure is controlled by the hydraulic cylinder and a disc spring assembly produced , the pressure transmitted to the outer sleeve by sliding the yoke ring on the pressure ring . Lubrication and sealing system similar to GA rotor . Since virtually sealing system to the cross-sectional direction of displacement of the mixing chamber , the rotor shaft and wear the gap between the discs , the fine material will occur in this bond .
Comparing these two systems (GA and WYH sealing system ) , it is evident sealing position is clear distinction between the two factors . WYH sealing system as close to the rotor , only a small corner may accumulate materials. On the other hand , the role of movement of wear is easy to fill directly into the sliding surface , and thus adversely affect the wear on the equipment . GA sealing system has a relatively longer annular gap , the annular gap in the powder retention time is long, so that the oil can be better bonded . Therefore , the sliding surface may be protected better , sealing force can be minimized loaded . However , at the same time truck seal, part of the material in the annular gap increases the risk of accumulation , the seal oil is particularly important here .