Roads, parks and other municipal facilities, water wells, manholes sink under water wells, water wells and other water supply and drainage wells or holes, manhole cover, Zhejiang, where the drain cover, can be used GM-type wells steel grating cover. GM-type wells steel grating cover is generally designed to be flip-Hefei drain cover much money one square meter, usually turn the opening and closing angle of 110 °. With a hinge pin steel grating cover not only security but also simplifies the construction process. In order to improve impact resistance, GM-type wells steel grating cover commonly used bar spacing of 50mm steel grating manufactured. Steel grating manufacturers use steel grating plug cleaner sulfuric acid relative density 1.84 ratio 24:22, 10 lithium chloride, hydrochloric acid, the ratio of the relative density of 1.15 25:35 drain cover, ammonium chloride, 5 water ratio 41: 38, the components can be dissolved in water. Cleaning plug steel grating, steel, black oxide film and surface rust. Temperature at 20 ~ 80 ℃ cleaning under drain cover, remove the black oxide film and rust at a temperature of 60 ~ 80 ℃ time is about 1 ~ 2min, effective substitution of concentrated hydrochloric acid. Advantages 1) washing oxide film speed and appearance of the same cleaning effect and hydrochloric acid; 2) Price ratio hydrochloride, and the washing increased; 3) harmful hydrogen chloride gases reduce evaporation, significantly improved environmental pollution, extend equipment life. Asahi Connaught wire mesh (Figure) _ _ drain cover manufacturers drain cover provided by Asahi Connaught Anping Wire Mesh Products Co., Ltd. Asahi Connaught Anping Wire Mesh Products Co., Ltd. (www.wangpian1688.com) located in Anping World. Scraps and development in the wave of market economy, the current Asahi Connaught metal mesh has a high profile in the wire mesh, and enjoy a good reputation. Asahi promise made of metal mesh network-wide business alliance certification, marking our service and management level has reached a new height. Asahi Connaught metal mesh staff willing to work with the community to develop insight for a better future.