Research On The Key Techniques Of Trackless Gantry Crane

Trackless gantry crane is a part of trackless transport system. Trackless gantry crane not only can be used to install segment during subway tunnel construction, to maintain segment during the subway operation, but also to install the precast inverted arch, the segment lining and to construct the prefabricated station, and so on.Trackless gantry crane adopted the more advanced mechanical arm technology. The crane’s running system is inclined and equipped wheel-side reducer to control speed.This paper is based on the special structure of the crane, and cooperated with the task“the research of the multifunctional prefabricated part installation equipment and construction technology in full face subway tunnel ” of China railway fifth survey and design institute group mechanical engineering machinery co., LTD. The following research has been made in the software Solidworks, ANSYS Workbench and ADAMS:(1)The dimension parameter of the trackless grant crane is calculated according to the working requirement of the crane and the diameter of the subway tunnel.Modeling and assembling the 3D model of the trackless gantry crane in Solidworks software, achieving the parametric modeling.(2)Static analysis of the crane beam’s four kinds of working condition can be conducted in ANSYS Workbench. The maximum stress is 102.57 MPa in the most dangerous working condition, which is less than the allowable stress 175 Mpa. So the design meets safety. Then according to the result of the static analysis. Steel thickness of the beam is necessary for optimizing.(3)Based on the maximum stress working condition, the thickness of the girder can be optimizing. Then quality optimization design can be conducted in the Shape Finder module, which will make the weight of the crane lighted. The removable area is calculated by the Shape Finder module. The thickness of the girder is reduced from12 mm to 8 mm, and the maximum stress becomes 144.89 MPa. The mass of the crane is reduced by 17%. The optimization design makes the stress well-distributed,material application sufficient.(4)The final model is modal analyzed in ANSYS Workbench. Fundamental frequency is 12.309 Hz., which is differ from the natural vibration frequency of the motor hoist and wheel-side reducer. This analysis shows the characteristics of mode can meets design requirements.(5)The 3D model of the trackless gantry crane can be imported into ADAMS.Then the model will be dynamic mechanical analyzed. The center’s track of the crane’s beam mass can be dynamic analyzed according to the displacement, velocity and accelerated velocity of the X,Y,Z directions. The result shows that crane can smooth running in the tunnel.