Based on the analysis of domestic manufacture situation , the paper points out that manufacture process of crane should be subject to the supervision as soon as possible , in view of the problems existed in the process and the features , it puts forward some measures for improvement 摘要在分析我国起重机械制造现状及其原因的基础上，提出应该将起重机械制造过程尽快纳入监管的观点，并针对目前起重机械制造过程特点和存在的问题，提出了具体的应对措施。
To go with this amendment , the factories and industrial undertakings ( lifting appliances and lifting gear ) regulations , the factories and industrial undertakings ( suspended working platforms ) regulation and the factories and industrial undertakings ( loadshifting machinery ) regulation were also amended to extend the duties of the principal contractor to other contractors who control the way any construction work involving the use of these equipment or machinery is carried out on the construction site 为了配合此项修订，我们亦对《工厂及工业经营（起重机械及起重装置）规例》 、 《工厂及工业经营（吊船）规例》和《工厂及工业经营（负荷物移动机械）规例》作出相应修订，把总承建商的责任，扩展至在地盘内控制任何涉及使用这些设备或机械的建筑工程进行方式的其他承建商。
Compared with other hoisting machinery , it possess many advantages , such as big span , high speed , high efficiency , simple structure , cheap cost and so on . and it also can get rid of the limit of weather and landform , exert the efficacy that other hoisting machinery and hoisting technology ca n ' t bring into play under specific condition 与其它起重机械相比，它具有跨度大、速度快、效率高、总体结构简单、造价低廉、施工周期短等突出优点，并且不受气候和地形条件的限制，在特定的条件下能发挥其它起重机械和起重技术所不能发挥作用。
Under this background the engineering practice shows that the traditional design method of a drum wall could be conservative . such designing method often leads to a thicker drum wall which causes not only difficulties for welding drums " bending and machining , but also let increase the machines " own weight , i . e . reduce the effective performance of the cranes 但工程实践表明，起重机卷筒传统的设计计算方法偏于保守，用传统方法设计现代起重机械的起升机构，会导致卷筒壁厚增加，这样不仅对焊接卷筒的弯曲、加工带来困难，而且往往会加大设备自重使起升机构工作性能降低。
There are many lifting equipments with thousands of varieties and specifications , such as l series of electric single beam cranes and manual single beam cranes , q series of electric bridge - style cranes , m series of gate - style cranes , qt series of tower cranes , and h series of electric hoist cranes , which are widely used in the industries of metallurgy , machine , mine , railway , port , oil , chemical industry , construction and so on 集团的主要产品有l系列电动系梁起重机及手动单梁起重机， q系列电动桥式起重机， m系列门式起重机， qt系列塔式起重机， h系列电动葫芦及其它形式的起重机械共有千个品种规格，广泛应用于冶金、机械、矿山、铁路、港口、石油、化工建筑等行业。
