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.
Hoist/Hoisting Mechanism,Hoisting Mechanisms,Hoist Mechanism,Hoist Motor Eurocrane (China) Co., Ltd. , https://www.eurocranegroup.com
According to Liu Xianqiu, secretary general of the China Film Industry Association, in terms of technological innovation, China has made major breakthroughs in ultrafiltration, microfiltration and reverse osmosis. The original production of reverse osmosis membranes has always been a blank space. At present, at least three domestic companies have been able to achieve localization and have achieved the bulk export of products. Microfiltration membrane and ultrafiltration membrane technology have reached the world advanced level, are widely used in municipal engineering and sewage treatment projects, and has formed a group of more influential domestic brands. In addition, the gas phase film and inorganic film technology have also been greatly improved, and show a broader application prospects.
Another sign of the maturity of China's membrane and water treatment technologies is that many domestic companies are not willing to stay on the production of membrane and membrane accessories, but also can systematically contract water treatment projects. China Bluestar Beijing Cleaning Company is in the domestic pharmaceutical industry in recent years. One of the outstanding general contractors in the field of beer and food, metallurgy, municipal engineering and other areas, its membrane and water treatment specialization company enjoys a good reputation in the industry.
Liu Xianqiu said that the direct cause of the advancement of China's membrane and water treatment technology is the sustainable development and the implementation of the national policy of circular economy. The market demand has effectively driven the drive Chain of application and industry, industry and scientific research.
Membrane and water treatment technology approaching the international advanced level achieved a qualitative leap
The 7th China International Film and Water Treatment Technology and Equipment Exhibition closed on September 16th. The film and water treatment technology and equipment manufacturing in China have achieved a qualitative leap over the past few years. Its overall strength has approached the international advanced level. Level.