Mechanical conveyors

Conveyors, mechanical, 76-88 Cooling towers, 280-285 approach to equilibrium, 234 bid data required, 284 kinds of fill, 282 performance curves, 284 sizing example, 281,282 sketches, 283... 

Anhydrous hydrogen cyanide and a 50% solution of sodium hydroxide are fed into a reactor. The reactants are heated in a crystallizer to remove water and form the sodium cyanide crystals. The sodium cyanide is filtered, then dried on a conveyor. Mechanical devices (e.g., cyclones) are used to produce wither briquettes or granular products. The feed must be essentially pure to obtain high quality, 99% sodium cyanide [75]. Figure 4.6 is a flow diagram of the sodium cyanide process [76],... 

As an example, consider the design of a simple conveyor mechanism, depicted in Fig. 5.3, built from multiple DEAs that will push a small cylindrical object forward. One solution is to use a central controller to coordinate the behavior of each actuator. Without feedback, the timing of actuation of each DEA would need to follow a predetermined pattern. However, as the object accelerates, or if objects with different masses or rotational inertias are transported, it would be difficult to ensure synchronized actuation in such an inflexible system. To improve flexibility, feedback from each actuator is required. Typically this would involve conventional external sensors, e.g., laser displacement sensors, LVDTs, optical encoders, or motion sensors, and the use of a centralized controller to coordinate the overall... 

In Fig. 5.7 an example of a conveyor mechanism consisting of multiple artificial muscle actuators pushing a small cylindrical object up some inclined rails is shown. To realise our ctenophore-like DEMES conveyor system, however, a method is needed for measuring capacitance. 

Keep the conveyor mechanism well lubricated at all times. 

The BMA diffuser is a cylindrical tower with a conveyor mechanism attached to a central rotating shaft. Guide plates on the shaft direct the cossettes upward, while the juice exits through screens at the bottom. 

There are three basic ways to achieve mechanical expression, ie, with an indatable diaphragm, with a compression belt, or in a screw conveyor of reducing pitch or diameter. 

Other designs squee2e the cake between two permeable belts or between a screw conveyor of diminishing diameter, or pitch, and its permeable enclosure. The available filters which use mechanical compression can be classified into four principal categories, ie, membrane plate presses, tube presses, belt presses, and screw presses. 

The mechanical design of the idler roUs is a function of the particular service under which the conveyor operates. Minimum industrial standards for roU dimensions, bearings, and appHcation criteria for different service conditions have been estabHshed (14). Idler life is deterrnined by a combination of factors such as bearings, seals, shell thickness, load density, and the operating environment. 

These coaveyors are made up of standard mechanical components that can be configured ia differeat ways to perform a particular task. The types most used ia the chemical iadustry iaclude aproa, flight, and drag chain conveyors. 

Kecommended Practice for Troughed Belt Conveyors, The Mechanical Handling Engineers Association, London, 1986. 

The pusher-type furnace is relatively free from mechanical problems because all mechanical parts are located outside the hot zone. It employs a roller-conveyor usually and will handle charges weighing considerably more per square meter than a belt-conveyor furnace. Pushers are driven by electric motors, compressed air, or hydraulic systems and can be automatically timed and synchronized with door-... 

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