Chain conveyor

Steam-heated air is the usual heat-transfer medium employed in these dryers, although combustion gases may be used also. Temperatures above 600 K are not usually feasible because of the problems of lubricating the conveyor, chain, and roller drives. Recirculation of air is in the range of 60 to 90 percent. Conveyors may be made of wire-mesh screen or perforated-steel plate. The minimum practical screen opening size is about 30 mesh. 

This type of cast iron is made by high-temperature heat treatment of white iron castings. The mechanical properties of malleable cast irons are given in Table 3.1 usually they are applied to the fabrication of conveyor chain links, pipe fittings and gears. 

The applications of polyoxymethylene include plumbing and hardware (ballcock valves, shower heads, fittings and valves, pump and filter housings), machinery (gears, bearings, rollers, conveyor chains, airflow valves), transportion (fuel pump housing, cooling-fan parts, fuel... 

Chains, sprockets, conveyor chains or rollers Dispersions in oils or greases (polyglycol for high temperatures)... 

Fresh material enters the inlet hopper on the upper level and makes its way into the drag conveyor chain just before the conveyor chain starts its downward pass to the lower level (Figure 27). 

Solid belts are used for pastes and fine powders. Through circulation belts are applied to granules more than about 3 mm in narrowest dimension. When the feed is not in suitable granular form, it is converted in a preformer to a size range usually of 3-15 mm. Belts are made of chain mail mesh or metal with 2 mm perforations or slots of this width. Steam-heated air is the most common heat transfer medium however, combustion gases may be used. A temperature limit of 620°F is recommended Perry s, 1997, p.12.48) because of problems lubricating the conveyor, chain, and roller drives. 

Basically, they are heavy-duty feeders. Apron feeders are composed of a series of steel plates, which overlap to form a continuous belt (Figure 25). The plates are linked together or mounted on a conveyor chain and driven by sprockets. 

Pop-up (rollers) Powered rollers rise up between conveyor chains or rollers to lift carton above conveyor surface and propel it off to the side. Provides good load orientation. Sort rates to 150 spm loads to 5001b. 

The conveyor bed can be driven by either driving the conveyor bed directly, or by driving bed chains attached to both sides of the conveyor. The arrangement with attached conveyor chains is the most common. 

Imparts detergency, wetting power, emulsification and lubricity. Has good compatibility with inorganic builders in aqueous systems. Dispersant and foaming agent especially suited for industrial and specialty cleaning compounds as well as conveyor chain lubricants. 

Food conveyor chains Yamakyu Chain Co. High-temperature, high speed-performance without lubrication. Resistance to cleaning chemicals... 

Proper design of the clay hopper is very important. Its walls should be as steep as possible, and preferably be plastic-lined, in order to prevent the clay from sticking to it. The handling appliance - apron conveyor, chain conveyor or belt conveyor — should not be too narrowly dimensioned, even if only quite small quantities of clay have to be handled, because otherwise arching of the material between the side guide plates of the conveyor is liable to occur, giving rise to trouble with feeding the clay. 

Straight-running flat-top chains are standardized in ASME B29.17M, Hinge Type Flat Top Conveyor Chains and Sprocket Teeth. 

A straight conveyor is not always possible, due to flow processes, obstructions in the plant, etc., so side-flexing flat-top conveyor chains were developed. These chains are based on straightrunning designs, but have additional clearance in the joint that permits the chain to traverse curves in one or two directions (Figure 1-30). Side-flexing flat-top chains are not covered by any ANSI standard, but they are an important item in the flat-top product line and will be covered further in this book. 

The chains discussed herein are standard chains assembled from parts fabricated from steel or molded from plastic. Cast link chains are beyond the scope of this book, but cast carrier rollers are found in some conveyor chains. Assembly is usually by means of interference fits or by welding. Pin ends may be staked, spun, or riveted. 

Rollers on conveyor chains normally have diameters considerably larger than the widths of their adjacent sidebars, as shown in Figure 2-4. This is done for two reasons. First, and most obvious, the large rollers, called carrier rollers, carry the sidebars well above the conveyor tracks... 

ASME B29.27 hollow-pin roller conveyor chain, in single pitch or double pitch, as shown in Figure 2-13. 

ASME standard B29.15 lists a few of the more popular steel roller conveyor chains and attachments. But manufacturers produce many more models of this type of chain and furnish them with a wide variety of attaehments. These chains are mainly used in conveyors with flights or slats, although they are also sometimes used in bucket elevators and scraper conveyors. 

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