PBS_Powder & Bulk Solids

Powder & Bulk Solids, June 2018

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Powder & Bulk Solids TechnicalExclusive 12 pockets can also be incorporated to help manage wear. Other Considerations Sticky Materials If the material being conveyed through the gate is sticky, it may tend to build up on the blade. This buildup, if not dealt with, will cause the gate to malfunction. It will fail to open and close properly, leading the reduced material flow, or stop- ping it all together. It is important to consider this when choosing the gate, as certain types and models are more susceptible than others, and gate manufacturers have vari- ous options available to combat this problem and will be able to deter- mine which is best for the particular application. Actuation Gates can be actuated by a va- riety of means. Often the sim- plest and lowest cost method is manual actuation. This can take the form of a hand wheel, hand crank, chain wheel, etc. Typically, these types of gates utilize either rack and pinion ar- rangement or a threaded rod ar- rangement to open and close the gate. Gates with a rack and pin- ion arrangement typically require fewer turns to open and close than a threaded rod. However, the rack and pinion is difficult to seal and tends to require more space. The threaded rod arrange- ment requires less space, but requires more turns to open and close. These gates rely on the force a person is able to exert on the manual operator to open and close. In certain situations, this may be prohibitive due to the size of the gate or the force re- quired, or due to inaccessibility. For situations requiring large amounts of force, remote or au- tomated operation, gates can be actuated using pneumatic, hy- draulic, or electrical actuators. Each type has its advantages and disadvantages and should be se- lected with consideration given to the operating environment (indoor or outdoor, temperature etc.), what power sources are available (what is used in the plant), and the actuation speed required (pneumatically actu- ated gates can open and close much quicker than hydraulic or electric). Gate manufacturers will size the actuator for the specific gate and its intended application. ome will offer an oversize option if extra force is required. Gates come in many different shapes and forms and each appli- cation is different. It is important to consult with the gate supplier or manufacturer in order to prop- erly select the gate for a particu- lar situation and to select the necessary options to ensure that the gate functions as desired. Ricky Patel, BESc, is an engineer- ing associate, Lorenz Conveying Products, Cobourg, Ontario, Canada. Lorenz has been a lead- ing manufacturer of couplings, tube and pipe bends, fittings, diverter valves, slide gates, cyclones, and custom fabricated accessories for pneumatic conveying, vacuum, and bulk handling systems since 1979, servicing the plastics, food, and chemical industries. For more information, call 905-372-2240 or visit lorenz.ca. Lorenz maintenance gate J u n e 2 0 1 8 www. .com Visit Our Website for Breaking News Updated throughout the Day

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