On July 7th, a project of polyester fiber staple technology --- an annual output of 60,000 tons of polyester staple fiber engineering technology development project, after six months of meticulous preparation and testing, a breakthrough in the Shanghai Petrochemical Corporation, The core technology of its research, the center blow-drying tow cooling molding technology has reached the desired goal. The success of this test indicates that China's polyester staple fiber large-scale production technology is in a leading position in the world.
It is understood that at present, the maximum single-line capacity of large-scale polyester staple fiber complete sets of equipment in the world is 50,000 tons per year. Breaking this target has become the technical limit that all authoritative experts in various countries are concerned about and the targets of major manufacturers. China's annual output of 60,000 tons of short fiber domestic engineering technology and software package project is based on technology development. The production capacity of 200 tons per day is not only China's largest capacity for self-development, but also a leading position in the international community. The air blown tow cooling molding technology is the core of the annual production of 60,000 tons of short fiber production technology. The localization rate of a full set of technical equipment reaches 80%, which greatly reduces investment and brings valuable economic and social benefits.
China's chemical fiber industry was developed in the 1970s. During the period, the capacity of polyester staple fiber production lines redeveloped using imported equipment and domestic absorption technology reached an annual output of 15,000 tons. The annual production capacity of the production line introduced in the late 1980s and early 1990s was more than 30,000 tons. At present, China has become the largest producer of polyester fiber and chemical fiber in the world.
A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or Chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or Wire Rope as its lifting medium.
The basic hoist has two important characteristics to define it: Lifting medium and power type. The lifting medium is either wire rope, wrapped around a drum, or load-chain, raised by a pulley with a special profile to engage the chain. The power can be provided by different means. Common means are hydraulics, electrical and air driven motors. Both the wire rope hoist and chain hoist have been in common use since the 1800s, however mass production of an Electric Hoist did not start until the early 1900s and was first adapted by Germany. A hoist can be built as one integral-package unit, designed for cost-effective purchasing and moderate use, or it can be built as a built-up custom unit, designed for durability and performance. The built-up hoist will be much more expensive, but will also be easier to repair and more durable. Package units were once regarded as being designed for light to moderate usage, but since the 60s this has changed. Built-up units are designed for heavy to severe service, but over the years that market has decreased in size since the advent of the more durable packaged hoist. A machine shop or fabricating shop will use an integral-package hoist, while a Steel Mill or NASA would use a built-up unit to meet durability, performance, and repairability requirements. NASA has also seen a change in the use of package hoists. The NASA Astronaut training pool, for example, utilizes cranes with packaged hoists.
Hoisting Mechanism
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