(17) is hanging objects must not run over people or equipment. (18) When a unit of welding crane to set up a special ground, do not allow the use of body ground. (19) The hook is in the lower limit position, must retain more turns on the reel safety ropes. (20) does not allow the crane bumped, but does not allow the use of a crane to promote another crane to work. (21) lifting heavy objects, liquid metal, when explosive and dangerous bridge crane buy, it must be slowly lifted from the ground 100 ~ 200mm, test brake reliability. (22) Repair and inspection lights 15 tons bridge crane, the voltage must be below 36V. (23) Overhead Crane All electrical equipment enclosure should be grounded. As the trolley track is not in the main beam welding, welding ground measures should be taken. Available ground wire cross-sectional area larger than 75mm2 bare copper galvanized flat iron or 10mm2 or 30mm2 larger than the galvanized steel bar. Ground position or crane cab body should be more than two. Any little ground resistive bridge to power neutral between dual-beam crane crane, should be less than 4Ω. (24) to have regular technical safety checks, do preflight preparatory work. So what is the cause of a crane accident lost? Why should there be an accident lost it? Now I will give you to answer it. First of all, we come to know the phenomenon of loss and harm crane accident. Lost crane refers to a crane accident at the time of operation, the suspension load, spreaders and other heavy objects falling from the sky suddenly, to harm people's lives and property of the accident. Lifting of the most common accident is the most dangerous accident loss. Here, we are concerned that the type of accident and the loss of reasons: 1, broken rope accident. Hoisting rope fracture is very common crane accident lost a crane, mainly because of overloading lifting pull off the rope, hanging oblique, causing chaos rope pinch-stayed off the rope, long rope is used and the resulting lack of maintenance rope wear and other causes. 2, rope off the accident. Rope off the accident means lifting heavy objects falling from the bondage rope, resulting in destruction of accident casualties. The main reason causing the accident off the rope is tied to improper methods and essentials heavy, causing heavy slippage; suspension load had been a collision, impact, vibration, etc. wavering, causing weight loss and so on. 3, off the hook accident. Delink accident means heavy, hoisting rope or hook hook special spreader emerge from the mouth of the weight loss caused by the accident. The lack of protective equipment hook hook; hook guard protector function failure; improper lifting hook hook method and deformation caused by opening the mouth too much, and many other causes of accidents occurred off the hook. 15 t crane, generous heavy (certified), Nanning bridge crane provided 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.