Problems of blockages caused by lumps forming a stable arch structure over a flow channel are generally easy to foresee, but hard to predict with any degree of accuracy because the process is stochastic and depends on many factors. Flow stoppages of this type are often a problem when flow is required through relatively small openings
Simple guidelines for “safe” opening sizes are often published that quote a single multiple of particle size for circular and slot outlets. In practice, apart from the advantage of a slot over a circular or square opening, reliable flow is influenced by the form of the constituent particles whether the material is dynamic or starting from a static condition. Guidelines taking these features into account are given below based on a multiple of maximum particle size. The advantages of Mass Flow at the outlet region are clearly seen.
Fitting a valve at the opening size for static conditions and converging to the dynamic size of orifice below the valve can attain the benefits of dynamic flow for the final outlet connection size. Even better results can be achieved in plane flow when transverse relief is provided by sigma two relaxation.
Sigma two relaxation, a technique exploited by Ajax to enable reliable flow through openings less than normally practical. Where the particle composition is of variable size, these orifice sizes may be generous, but the tendency for granular products to segregate can form irregular concentrations in a flow system. In circumstances where “caking” or agglomerations may occur and the size of potential lumps is indeterminate, it is prudent to incorporate lump traps, diverting screens or inserts that provide long slots to allow flow to continue if part is blocked by lumps.
Ajax offers a range of lump-breakers to overcome more serious blocking hazards, both as self-standing machines and as integral fittings with hoppers or chutes. A virtue of screw feeders is that they offer large and efficient flow openings and also tend to reduce friable lumps.
Dealing with Structural Arches
Dealing with Structural Arches
Problems of blockages caused by lumps forming a stable arch structure over a flow channel are generally easy to foresee, but hard to predict with any degree of accuracy because the process is stochastic and depends on many factors. Flow stoppages of this type are often a problem when flow is required through relatively small openings
Simple guidelines for “safe” opening sizes are often published that quote a single multiple of particle size for circular and slot outlets. In practice, apart from the advantage of a slot over a circular or square opening, reliable flow is influenced by the form of the constituent particles whether the material is dynamic or starting from a static condition. Guidelines taking these features into account are given below based on a multiple of maximum particle size. The advantages of Mass Flow at the outlet region are clearly seen.
Fitting a valve at the opening size for static conditions and converging to the dynamic size of orifice below the valve can attain the benefits of dynamic flow for the final outlet connection size. Even better results can be achieved in plane flow when transverse relief is provided by sigma two relaxation.
Sigma two relaxation, a technique exploited by Ajax to enable reliable flow through openings less than normally practical. Where the particle composition is of variable size, these orifice sizes may be generous, but the tendency for granular products to segregate can form irregular concentrations in a flow system. In circumstances where “caking” or agglomerations may occur and the size of potential lumps is indeterminate, it is prudent to incorporate lump traps, diverting screens or inserts that provide long slots to allow flow to continue if part is blocked by lumps.
Ajax offers a range of lump-breakers to overcome more serious blocking hazards, both as self-standing machines and as integral fittings with hoppers or chutes. A virtue of screw feeders is that they offer large and efficient flow openings and also tend to reduce friable lumps.
For more information, please visit:
https://edir.bulk-online.com/profile...-equipment.htm1083 ajax equipment.htm
http://www.google.de/search?client=s...nWDYjvOfHyjfQMsearch?client=safari&rls=en&q=ajax+site:bulk online.com&ie=UTF 8&oe=UTF 8&rediresc=&ei=XMBKTJnWDYjvOfHyjfQM
http://www.google.de/search?num=100&...=&oq=&gsrfai=search?num=100&hl=de&client=safari&rls=en&q=Lyn+Bates+site%3Abulk online.com&btnG=Suche&aq=f&aqi=&aql=&oq=&gsrfai= ■