The Research Of Bolt Tensioning Jack And Test Ecquipment

With the development of thermal power and nuclear power,etc and the expansion of power unit,large bolt connection is playing a more and more important role in equipment assembly,which the bolt pre-tightening is an important factor to ensure the quality of connection.Traditional bolt pre-tightening by workers with a hammer percussion wrench or using the method of hydraulic wrench,but these methods for equipment,bolt and sealing material not only has the damage,and often there will be a deformation caused by uneven pretightening fittings,pressure vessels leakage accident;At present,the widespread adoption of bolt tensioning jack in the world to realize the bolt pre-tightening,powered by high pressure oil pump,using material allows the elastic range,within the scope of the elastic deformation of tensile bolt,so as to achieve the purpose of the bolt,has simple operation,easy to use,safe and economic characteristics,has been widely used in metallurgical mining,shipbuilding,electric power system,vehicles,heavy machinery,petrochemical,and other fields.In see bolt stretcher used widely at the same time,we also should pay attention to the working environment of bolt tensioning jack is more and more bad,such as applications of pressure is more and more high,working space is smaller and smaller,if the material selection of bolt tensioning jack is improper,or the structure size design is unreasonable,it is easy to appear on the engineering hydraulic cylinder jammed or blowout,distortion,and the piston and cylinder jammed or stretcher leak phenomenon,it will cause big loss for the factory,appear even casualties;In addition,the high hydraulic cylinder of the hydraulic bolt tensioning jack requirement,for the cylinder and piston seal put forward higher request,so it is necessary to carry out the bolt stretcher before use pressure testing,ensure the safety and reliability of the bolt stretcher,so the bolt tensioning jack test equipment is imperative.This paper mainly designed a kind of M56 hydraulic bolt tensioning jack at the highest pressure 180MPa and test equipment which can support the biggest pressure of 1600 tons aimed about this kind of bolt tensioning jack,and used the modern three-dimensional software and finite element software for modeling and stress analysis,made the principle diagram of the hydraulic pressure test and the test outline,finish bolt tensioning jack factory test,and apply the results to the production practice,thus giving impetus to the development of bolt tensile machine and related equipment,to solve the domestic market in urgent need of the bolt tensile test equipment problem.