Construction crane danger caused by factors

By analyzing the following main reasons:
     1, special equipment manufacturing license terms
     In some places because of the quality and technical supervision departments relevant laws and regulations recognize different;hoist crane implementation of strict, so that some do not meet the requirements of the lifting machinery and equipment manufacturing enterprises achieved a "special equipment manufacturing license", leading to some unqualified products into the rental market.
     2, special equipment manufacturing supervision and inspection of
     Lifting machinery manufacturing enterprises producing devices can not achieve 100% detection rate, resulting in some mechanical equipment factory have failed to obtain a "product certification" and "special equipment manufacturing supervision and inspection certificate."
     3, the production technology
     At present, China's production of construction lifting equipment company, with a tower  Steel crane  self-development capacity, very few companies, mostly using imported equipment production technology tower crane drawings, but for some structures, institutions had to change, because the original tower crane design drawings of the core technology to understand, there is a deviation on digestion; substitution of materials, manufacturing processes, tooling manufacturing, design improvements, technical capabilities are not designed to support the unit, resulting in some construction crane equipment in production technology to a security risk.
From the above causes manufacturers of products have quality problems caused by industrial accidents.bridge crane By 1990, the country's 128 since starting construction crane responsibility for production safety accident analysis, accident six due to quality problems, accounting for 4.7%.