FEED Business Worldwide - June 2012
Connecting efficiency to large-scale mixing 
by DONG Biao and WEI Erte , Jiangsu Muyang Group Co., Ltd, China.
Proportioning and mixing are the most important steps in the feed manufacturing process and often dictate the capacity of the plant.
As meat consumption has risen dramatically in developing countries over the past few years, the global industrial feed milling machinery suppliers have been driven to grow expand both the quantity and quality of their technology. Equipment which can cost-efficiently produce feed in large quantities, meeting the demands of high quality feed production is on the the wish list of many integrators and large capacity feed mill operators..
In order to bring up the capacity of a mixing system, the mixer size should be increased, the mixing cycle itself should be shortened, and the production inputs used should be as economical as possible. But no matter how the mixer is refined, the objective is always to achieve a homogeneous mixture of balanced nutrition.
With the same object and the in-depth knowledge of feed mixing technology, Muyang researchers have launched the SJHS 8 Mixer. With this new model, Muyang boosts the largest available capacity of its double-circle paddle mixer lines from 6m3 to 8m3. (See Fig.1.)
The mixer has been also improved in terms of capacity, efficiency and hygiene.
Scale up production with high mixing homogeneity 
Prior to the SJHS 8's launch, there had already been over 700 sets of Muyang SJHS model mixers installed at feed mills and integrator complexes worldwide since 2007. Featuring a patented double-circle paddle rotor structure (see Fig.2), they are well-known for providing up to 97.5% feed raw material homogeneity and short mixing cycle of 60 to 90 seconds. 
As a result of improvements made to their mixing efficiency, the feed industry increasingly relies on paddle mixers. Muyang's SJHS series of double-circle paddle mixers further enhances such improvements by using the combination of inner and outer paddles that reinforce convectional mixing movement. Besides, the paddle faces are adjustable and allowed to optimize mixing solutions for different formulations. It can achieve the formulations a mixing homogeneity over 95% within 90s easily.
The SJHS 8 Mixer performs as well as the other SJHS series mixers in mixing homogeneity and efficiency. A volume of 8m3, on the other hand, it can process up to 4 tonnes of feed materials per batch and at least 16 batches per hour.  
Having said that, this is not merely a larger capacity, larger scale version of previous releases in this paddle mixer line, as it features uniquely innovative features in its own right.
Features unique to the SJHS 8 includes two 37kW motors, each situated at opposite ends of the rotor shaft. They have the effect of driving the rotor shaft in a balanced, symmetrical manner. This balances the stress on the drive shaft parts, thereby contributing to a more uniform and stable mixing process.
Two air-return ducts are designed to route back displaced air from the mixer back to incoming feed ingredients. This has the benefit of quickly restoring balanced air pressure within the mixing chamber, thereby minimizing friction and streamlining the flow of feed materials in and out of the mixer. (See Fig.3.)
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