Conveyors continuous-bucket

Figure 5.12. Bucket elevators and conveyors, (a) Spaced bucket elevator, (b) Bucket conveyor for vertical and horizontal travel, (c) Discharge of pivoted buckets on horizontal path, (d) Spaced buckets receive part of their load directly and part by scooping the bottom, (e) Continuous buckets are filled as they pass through the loading leg with a feed spout above the tail wheel, (f) Centrifugal discharge of buckets, (g) Discharge mode of continuous buckets.

Continuous Percolators Coarse sohds are also leached by percolation in moving-bed equipment, including single-deck and nmlti-deck rake classifiers, bucket-elevator contactors, and horizontal-belt conveyors. 

Continuous transport of the solids against the solution is employed in several kinds of equipment, including screw, perforated belt, and bucket conveyors. One operation carries a bed of seeds 3-4 ft thick on a perforated belt that moves only a few feet per minute. Fresh solvent is applied 1/5 to 1/3 of the distance from the discharge, percolates downward, is collected in pans, and is redistributed by pumps countercurrently to the travel of the material. 

Glycerin is metered by means of a bucket conveyor (Fig lb) driven by hydraulic turbine The arrangements for introducing measured quantities of acid and glycerin are connected by a lever (2) in such a way that the influx of acid and NG into the nitrator proceeds at a predetermined ratio. Movement of the tipping vessel exerts a pull on the lever, and this takes the brakes off the bucket conveyor. The conveyor immediately starts to move, and continues to do so until the acid metering vessel returns the lever to its former position and stops the conveyor again... 

Cartoner. This may be automated and continuous-motion equipment that receives containers that are standing upright in single file on a feed conveyor. The patient leaflet is positioned by the rotary leaflet placer at the bottom of the infeed bucket followed by a container on the side. The presence of the container and leaflet is verified automatically, and a folding carton is checked in a corresponding bucket. This triggers a push arm to transfer the container and leaflet from the bucket into the erected carton. 

Materials-handling equipment is logically divided into continuous and batch types, and into classes for the handling of liquids, solids, and gases. Liquids and gases are handled by means of pumps and blowers in pipes, flumes, and ducts and in containers such as drums, cylinders, and tank cars. Solids may be handled by conveyors, bucket elevators, chutes, lift trucks, and pneumatic systems. The selection of materials-handling equipment depends upon the cost and the work to be done. Factors that must be considered in selecting such equipment include ... 

Safe separation studies were conducted to achieve increased production and cost effectiveness with improved safety. A typical ammunition production line flow diagram (in this case for the manufacture of 105 mm projectile) consists of several work areas as shown in Fig 8. ( (l) Receiving and storage, (2) Box open and inspect (3) Melt Pour (U) Cool (5) Hold (6) Funnel Pull and (T) Riser Preparation.) Explosive material is transferred by automatic conveyor between these work areas. The requirement was to establish safe separation between explosive boxes, pallets with and without funnels, buckets, and to determine critical height of continuous feed flake Comp B and TNT. The objective of these tests was to establish minimum nonpropagation distances between these items so that an explosion chain reaction will be prevented. 

In some processes the crushed solid particles are moved continuously by bucket-type conveyors or a screw conveyor. The solvent flows countercurrently to the moving bed. 

Depending upon how chain and moving elements are mounted for a specific duty, several types of chain conveyors can be obfained. Scraper conveyors will have the moving element, or flight, fitted perpendicular between two strands of roller chains, while apron conveyors will have fhe moving elements, or pans, overlapped and mounted on the same plane of roller chains forming a continuous "apron." When buckefs are fixed to two strands of roller chains mounted on a steep-sloped or vertical structure, elevation of bulk solids can be possible in the so-called bucket elevators. 

As employed here, the term relates to material handling devices which run continuously. The material itself may be carried along in a continuous flow (e.g., on a belt conveyor) or in individual receptacles which may be very closely spaced (e.g., on a bucket conveyor) or farther apart (e.g., on a bucket elevator) or indeed some considerable distance apart and possibly detachable (e.g., on aerial ropeways or tramways). 

Like the swing bucket elevator, the continuous-flow conveyor can therefore move the material vertically as well as horizontally. The swing bucket elevator is expensive in initial cost and takes up a considerable amount of space, but has the advantages of low wear and little maintenance. Also, it can handle coarse lumps of material. On the other hand, the continuous-flow conveyor is used only for pulverized, fine-grained or flaky materials, which are carried along in a totally enclosed duct, so that there is no dust nuisance. It is to be noted that these conveyors are quite unsuitable for dealing with sticky, corrosive or ungraded materials with hard constituents. 

On large-scale tests, it is necessary to employ a continuous device to remove the discharged cake from the test area, because of the sheer volume which accumulates in a short time. This device will probably be a simple belt conveyor or perhaps a screw conveyor. Manually removed hoppers, or buckets, can suffice on the smaller tests. 

Many hundreds of years passed before the need arose to handle other than water in a continuous mechanical manner. The demand to process large quantities of grain from the newly exploited vast American plains led to the mechanisation of flour mills, an early type of which is thought to have been made by Evans around 1742. His grandson, Oliver Evans, built a fully mechanised mill in 1785 that included belt conveyors, bucket elevators and a... 

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