Catalog excerpts
Application of Rotary Paddle Switch in Level Measurement for Moisturized Materials Rotary paddle switch is a common level switch for level measurement of granular and powdery solids. With simple working principle, convenient operation and lower price, it is widely favored by customers. However, working conditions in level measurement applications are complicated and different. For each application and its working conditions, there are specific requirements for rotary paddle switch and its installation accordingly. Rotary paddle switch in level measurement for materials that is moisturized or containing moisture is a typical complicated application. That´ what we are going to talk about in this article. s Fig.1 Material accumulation and scarring Rotary paddle switch is generally used in level measurement for dry materials. It is not recommended for material with strong hygroscopicity due to its physical structure. We know that normal operation of rotary paddle switch relies on mechanical precision fitting between motor and transmission shaft, transmission shaft and bearing, and fittings in oil sealing mechanism. Moisturized material or material containing moisture can easily "scar" at the base of spindle (as shown in Fig.1). Over a period of time the material accumulated around the shaft. It would increase resistance to spindle rotation, affect normal rotation of the blade and eventually motor would fail to drive the spindle and false switching signal would be generated. In addition, moisturized solid materials are easy to agglomerate. That means it can agglomerate to a large volume or heavy weight of blocks or dough. These blocks will impact rotary blade Shenzhen Jiwei Automations Ltd.
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and transmission shaft, cause serious deformation of the blade and transmission shaft, damage the instrument and stop the normal operation of the whole equipment. So, is it true that rotary paddle switch cannot be used in level measurement for material that is moisturized or containing moisture? The answer is certainly “No”, not absolutely true. The characteristics of the measured material have a great impact on the service life of the instrument. What we could do is to find out how to avoid adverse effects. After going through a large number of tests and analysis, engineers in Jiwei found...
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silos at the beginning. Unlike the shaft which was protected by a protective sleeve, the blade was not rigid enough to bear the impact from moisturized and easily agglomerated materials (such as sludge etc.). The blade was deformed almost 90 ° to the impact. due In addition, when the V-shaped protective baffle is installed, one must consider whether the space between protective baffle and spindle is too narrow or small because material containing moisture usually has poor fluidity and easy to agglomerate. It is easy to accumulate in a narrow space (dead zone) and form “scars” on the shaft....
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alarm signal. Therefore, it is recommended to use a silo with an alcove (as shown in Fig.3) to avoid material direct impact on the blade and material buildup in dead zone. Furthermore, besides of taking the above measures and precautions, regular cleaning and maintenance of level meters is also necessary in order to ensure the rotary paddle switch to function well and extend its service life as much as possible. Shenzhen Jiwei Automations Ltd.
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