tailieunhanh - Industrial Machinery Repair Part Episode 1 Part 10

Tham khảo tài liệu 'industrial machinery repair part episode 1 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Conveyors 209 Configuration Screw conveyors have a variety of configurations. Each is designed for specific applications and or materials. Standard conveyors have a galvanized-steel rotor or helix and trough. For abrasive and corrosive materials . wet ash both the helix and trough may be hard-faced cast iron. For abrasives the outer edge of the helix may be faced with a renewable strip of Stellite a cobalt alloy produced by Haynes Stellite Co. or other similarly hard material. Aluminum bronze Monel or stainless steel also maybe used to construct the rotor and trough. Short-Pitch Screw The standard helix used for screw conveyors has a pitch approximately equal to its outside diameter. The short-pitch screw is designed for applications with inclines greater than 29 degrees. Variable-Pitch Screw Variable-pitch screws having the short pitch at the feed end automatically control the flow to the conveyor and correctly proportion the load down the screw s length. Screws having what is referred to as a short section which has either a shorter pitch or smaller diameter are self-loading and do not require a feeder. Cut-Flight Cut-flight conveyors are used for conveying and mixing cereals grains and other light material. They are similar to normal flight or screw conveyors and the only difference is the configuration of the paddles or screw Notches are cut in the flights to improve the mixing and conveying efficiency when handling light dry materials. Ribbon Screw Ribbon screws are used for wet and sticky materials such as molasses hot tar and asphalt. This type of screw prevents the materials from building up and altering the natural frequency of the screw. A buildup can cause resonance problems and possibly catastrophic failure of the unit. Paddle Screw The paddle-screw conveyor is used primarily for mixing materials like mortar and paving mixtures. An example of a typical application is churning ashes and water to eliminate dust. Performance Process parameters such as .