Line hanging valve wear a reason, line hanging fatigue operation, hydraulic valve springs and related balance valve, valve seat, in the long-term work load hypervariable hanging hardware store, will produce fatigue and crack, causing the spring to shorten the length, the entire broken, and the valve seat sealing surface spalling, damage and failure; second, deformed parts, but has been in use, the residual stress of hydraulic valve parts in the process and use of the residual load stress exceeds the yield strength of domestic and foreign parts and materials when , parts deformation, and failure can not complete the required functions; third, long line hanging in inferior environments, resulting in a large area of ??corrosion, hydraulic oil mixed with water or acids is too high, the use of a longer time will corrode the hydraulic valve The relevant parts to fail and lose their accuracy. Load capacity issues line hanging withstand during operation gantry crane line, line hanging device and its institutions to overcome these loads: traffic load lifting capacity of goods (goods lifting mechanism and by changing the position of the boom luffing mechanism to change the distance extension ), friction (certain goods lifting slewing mechanism, the horizontal movement mechanism and line hanging device), wind loads and snow loads (all work in the open air driving device). Said load is called external load or static load, dynamic load them and together make up the computing load. The following describes the method to determine the static load and cited their role in driving the device and its institutions on the way. Load cargo lift mechanism, these institutions can be tilted vertically moving a member, cargo and liquid dispersions. Cargo grab a piece of the rope by tying or specialized spreader to achieve. The method of tying the rope structure and goods allows the driver may pre-tensioned wire rope and the cargo lift smoothly from the foundation. Disk upgrade electricity and on similar situations. Rigid spreader grab the goods when the situation is less favorable, then often called the phenomenon occurs suddenly slipping, that is, when the moving speed of the spreader achieve considerable goods leave support. Regardless of what method to fetch line hanging test, if the driver can not see the goods, are also likely to occur suddenly hitches. When lifting the goods, as long as the institution to overcome part of the goods traffic load lifting amount, but also to overcome the friction between the cargo and rail. Line lift heavy loads amount to a piece of cargo is generally known, which can be obtained according to the volume and proportion. Sometimes lifting mechanism for flipping goods into pieces. In this case, some of the road load cargo lifting of an impact will enhance the role of the rope. Bulk and liquid cargo is usually some kind of container transport. In some cases, the line hanging device itself when the container spreader. It should be remembered and to determine lump-line dispersion quantity of the goods lift heavy loads, not based on the volume of proportion, but according to the proportion of the heap and taking into account their moisture and fragmentation. Gantry crane line, generous heavy (certified), Daqing line hanging by generous Heavy Machinery Co., Ltd., Henan Province. Heavy Machinery Co., Ltd., Henan Province, generous (www.hnqizhongshebei.com) (www.hnqizhongshebei.com) is Zhengzhou, engineering, construction cranes leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum Limits to meet customer needs. In heavy generous leadership with the staff warmly welcome all inquiries negotiations to create a better future for heavy generous.