AS/RS and conveyors

Racks are "flow-through" racks In which the unit load Is stored from one side of the rack by a dedicated SIR machine, and Is retrieved by another machine from the pick did of the rack. 3. Monomial AS/RSI: is a system designed to handle small loads that are contained in bins or drawers in the storage system. A. Generally smaller than a unit load AS/RSI and is often enclosed for security of the items stored. B. Uses special SIR machines to retrieve and transport the bins to the P&D station at the end of the aisle in order to be able to withdraw individual items from the bin. C.

P&D station is manually operated by a worker. D. The bin or drawer must then be returned to its location in the system. 4. Man-on-board AS/RSI: this system is dedicated for retrieving single items from outrage. A. Human worker drives a carriage of the SIR machine. B. Permits individual item that he picked directly at their storage locations. 5. Automated item retrieval system: a storage systems designed for retrieval of individual items or small product cartons. A. Items are stored in lanes. B. In retrieval process item is pushed from its lane and dropped onto a conveyor for delivery to the pickup station. . The supply of items in each lane is periodically replenished, allowing first-in. First-out Inventory rotation 6. Vertical' lift storage modules (EVILS): These are also called vertical lift automated outrage/retrieval systems. A. Uses a center aisle or more. B. Capable of holding large Inventories while saving valuable floor space In the factory. Three application areas can be distinguished for automated storage/retrieval systems: 1 . Unit load storage and handling. Commonly found in: Warehousing for finished goods. Manufacturing facilities e. G. Deep-lane systems are mostly used in food industry. 2.

Order picking. As order picking involves retrieving materials in less than full unit load quantities, monomial, man-an-board, and item retrieval systems are used for this application area. 3. Work-in-process storage systems. It's a new application recently developed of automated storage technology. The following ways are ways to manage unavoidable WIPE: a. Buffer storage in production. Used between two processes which production rates differ significantly. An in-process buffer is needed between these operations to temporarily store the output of the first process as the input for the second process. . Support of Just-in-time delivery. Just-in-time TIT) is a manufacturing strategy that follows the pull strategy in which parts required in production are received immediately prior they are needed in the plant. As this strategy is very risky in terms f stock outs that occurs due to late supplier deliveries, usually plants install automated storage systems as storage buffers for incoming materials. C. Kitting of parts for assembly. When an order is received, the required components are retrieved, collected into kits, and delivered to the production floor for assembly. . Compatible with automatic identification systems. Uses automatic identification devices; bar code readers which allows loads to be stored and retrieved without human interaction to identify the loads. E. Computer control and tracking of materials. Used to identify the location and tutus of work-in-process in the facility. F. Support of factory wide automation. Part 2: Prepare a report about manual and automated conveyors. CONVEYOR SYSTEMS Conveyors are used when material must be moved in relatively large quantities between specific locations over a fixed path.

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Conveyors divided into two basic categories: 1 . Powered conveyors The power mechanism is contained in the fixed path, using chains, belts, rotating rolls, or other devices to force loads along the path. They are usually used in automated material transport systems in manufacturing plants, warehouses, and distribution centers. 2. Non-powered conveyors. Tat or by using gravity from one height to a lower height. Types of Conveyors 1. Roller and Skate Wheel Conveyors. Roller conveyor: The pathway consists of a series of rollers that are perpendicular to the direction of travel.

The fixed frame contains rollers that lifts the pathway above floor level from several inches to several feet. Flat pallets carrying unit loads are moved forward as the roller rotate. Applications: manufacturing, assembly, and packaging. Skate-wheel conveyors are similar to roller conveyors but skate wheels rotating on shaft connected to a frame to roll pallets along the path way instead of rollers. Applications of skate wheel conveyors are similar to those of roller conveyors, except that the loads must generally be lighter. 2.

Belt Conveyors. Belt conveyors consist of a continuous loop: Half its length is used for delivering materials, and the other half is the return run. Belt conveyors are typically available in two types; Flat belts for pallets, individual parts, or even certain types of bulk materials; Thorough belts for bulk materials. Conveyors Driven by Chains and Cables. Uses chains that forms endless loop on which loads are carried directly. The loop forms a straight line with a pulley at each end. This is usually in an over-and-under configuration.

These conveyors are categorized as the following: 1. Chain: a. Used to transport heavy unit loads. B. Parallel chain configuration used to transport pallets. 2. Slat conveyor: a) Uses discretely spaced slats connected to a chain b) Unit being transported retains its position c) Orientation and placement of the load is controlled d) Used for heavy loads or loads that might damage a belt e) Bottling and canning plants use flat chain or slat conveyors because of wet conditions, temperature, and cleanliness requirements f) Tilt slat conveyor used for serration 3.

In floor towline conveyors: . Uses towline to provide power to wheeled carriers such as trucks, dollies, or carts that move along the floor b. Used for fixed-path travel of carriers (each of which has variable path capabilities when disengaged from the towline) c. Towline can be located either overhead, flush with the floor, or in the floor a. Uses a series of trolleys supported from or within an overhead track b. Trolleys are equally spaced in a closed loop path and are suspended from a chain c.

Carriers are used to carry multiple units of product d. Does not provide for accumulation e. Commonly used in processing, assembly, packaging, and storage operations 5. A power-and-free overhead trolley conveyor: a. Similar to trolley conveyor due to use of discretely spaced carriers transported by an overhead chain; however, the power-and-free conveyor uses two tracks: one powered and the other non-powered. B. Carriers can be disengaged from the power chain and accumulated or switched onto spurs c.

Termed an Inverted Power-and- Free Conveyor when tracks are located on the floor 6. Cart-on-track conveyors: a. Used to transport carts along a track b. Carts are transported by a rotating tube c. Connected to each cart is a drive wheel that rests on the tube and that is used to array the speed of the cart (by varying the angle of contact between the drive wheel and the tube) d. Carts are independently controlled e. Accumulation can be achieved by maintaining the drive wheel parallel to the tube 7.

Screw conveyors: a. Consists of a tube or U-shaped stationary trough through which a shaft-mounted helix revolves to push loose material forward in a horizontal or inclined direction b. One of the most widely used conveyors in the processing industry c. Many applications in agricultural and chemical processing 8. Vibration-based conveyors: a. Consists of a trough, bed, or tube b. Vibrates at a relatively high frequency and small amplitude in order to convey individual units of products or bulk material c.

Can be used to convey almost all granular, free-flowing materials 9. Vertical lift conveyors: is a power-based conveyer that moves products automatically from one level to another. A. Carrier used to raise or lower a load to different levels of a facility (e. G. , different floors and/or mezzanines) b. Differs from a freight elevator in that it is not designed or certified to carry people c. Can be manually or automatically loaded and/or controlled and can interface with horizontal conveyors

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