| Spherical tank is a common pressure vessel,and sometimes its internal medium is inflammable,explosive and poisonous.If the tank is damaged,it will leak the internal media,causing fire,explosion,poisoning and other accidents,therefore,it is an important work to test the spherical tank regularly.The internal testing of the conventional spherical tank requires a lot of scaffolding,which is time-consuming and complicated,making it more difficult to detect.According to this situation,the hydraulic transmission spherical tank detection device can facilitate the detection of the tank and improve the working efficiency.The measuring device designed for the paper is suitable for 3000m~3 spherical tank,and the diameter of manhole is500mm.The analysis process is as follows:(1)The repairman can reach all parts of the inside surface of the can in a manned box.The main structure of the detection device is a two-arm mechanism including vertical arm and horizontal arm.The accessories of the device include the upper connecting frame,hydraulic rotary mechanism,hydraulic lifting mechanism,manned frame and hydraulic system.Due to the size limitation of the manhole,the size of the mechanism through the manhole is all less than 500mm.The functions of the detection device can be realized:the expansion of the two-arm mechanism,the rotation of the horizontal arm around the central axis of the spherical tank,and the rotation of the horizontal arm around the tail of the vertical arm.Rotary motion and rotation are realized by hydraulic rotary mechanism and lifting mechanism respectively.The two arm mechanism draws lessons from the telescopic arm of the automobile crane and adopts hydraulic drive.Because of the difficulty of modular design and manufacturing process of testing equipment,both arms are hydraulic telescopic three arms.Its length is the same,the length of the three arms is 4000,4100 and 4150mm respectively.Two arms overlap 850mm,two and three arms overlap 890mm.A rectangle with a section shape of 4mm thick.To minimize the self-weight,the section size of the horizontal arm is smaller than that of the vertical arm.The hydraulic rotary mechanism and lifting mechanism are driven by hydraulic capstan and cycloidal motor.The manned frame is detachable and easy to pass through the manhole.The hydraulic system is provided with hydraulic oil by the hydraulic station for hydraulic components(oil cylinder of two-arm mechanism,hydraulic rotary mechanism,hydraulic lifting mechanism).(2)In order to ensure the safety of the structure,the upper roof of the two-arm structure and the spherical tank is used for material Q690A;The upper connection frame is used for material Q345A which is good for welding.The material of hydraulic cylinder is 45 steel.The man frame is used for the aluminum alloy material which density is small.The slide block between the telescopic boom is made of casting copper alloy which is suitable for high-temperature and wear-resistant.(3)Static analysis and static dynamic analysis of the detection device were analyzed by using traditional mechanics analysis and finite element analysis software ANSYS Workbench.The strength and rigidity of the structure are in the allowable value.In order to avoid the resonance of the detection device,modal analysis is carried out.Further detailed analysis is made on the connecting bolts of the steel wire rope,the connecting bolt of the maximum bending moment and the joint surface and pin.The strength of hydraulic cylinder,especially the stability is analyzed to prevent destabilization.The strength and stiffness of key parts are analyzed by finite element software.In order to detect the actual application of the device,the installation plan and debugging are made. |
PDF Full Text Request