Gu Chang outlined in ductile iron foundry with your anti-theft covers: 1, bolt hole blocking technique method. Bolts, nuts blocked the hook hole, but as long as a bowed head at both ends of the wire, inserted into two grooves under the bolt head inside, you can open and took the covers; 2, lock key method . 3, fork joint linkage method. Gu Chang foundry located in Inoue's hometown - Kim Gu treasure. Taigu Shanxi Jinzhong City, State Road 108, Hu village malleable Industrial Park, east of long high-speed circular covers offer, North Tongyu Qi-speed transport facilities, accessible. Taigu ductile iron manhole cover in the course will inevitably rust Which covers round, Gu Chang-year foundry to introduce you to a method for rust: projectile rust: is the use of high-speed rotating impeller blades blasting machine the abrasive surface scatter toward manhole covers round manhole cover casting, abrasive high-speed flying, impact and friction surfaces of manhole covers, ductile iron covers the surface to remove rust and scale, such as high efficiency of this method, rust quality Well, it makes ductile iron manhole cover surface roughness in order to facilitate access to certain paint adhesion, low labor intensity round manhole covers, dyed lighter hollow of a tree on the environment, production plant should give priority to the use of such methods. Gu Chang-year foundry founded in 2006, is a new modern and dynamic enterprises. Since the construction of ongoing efforts to grow, is to become a professional production of ductile iron covers the company, with annual production capacity of 5,000 tons, is being expanded with an annual output of 10,000 tons. I would like to plant good quality, competitive price, on-time delivery for the majority of merchants to provide high-quality service. Round covers processing, Luliang round manhole covers, Chang-year foundry provided by Gu Chang in foundry. Gu Chang-year foundry (www.sxcnzz.com) strong, credible, in Jinzhong machining industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chang and you work in the foundry into the brilliant, for a better future!