Research On Key Technologies Of SYB500 Loading Arm

As the most important handling equipment in the oil transportation, the stability and reliability of loading arm's operation determines whether the oil can be transported in time. The swivel joints are the heart of complete loading arm, and they are both the oil passage and the important structural components of loading arm to achieve full-connected in three coordinate axis. Their quality determines the value and life of the loading arm. In addition, the outboard arm, the inboard arm and the riser are not only the main carriers, but also the primary instruments of loading arm to achieve handling operation. So research on the swivel joint and the body structure is of great significance to the safety of loading arm. The research takes the central swivel joint and body structure of SYB500 loading arm as background.Firstly, the combined load is applied by two-step process, and through analyzing the change of contact angle, the maximum roller load of the central swivel joint on the loading arm is calculated under the combined load. Then Hertz theory is used to calculate the contact stress and the deformation. Non-linear contact analysis is carried out on the swivel joint by ANSYS software, the contact stress and the contact deformation of the ball are calculated, and they are compared with Hertz theory. The method of applying load of bearing in the finite element model is also researched.Secondly, considering the deficiency in the methods for calculating the life of the central swivel joint, the theoretical calculation method is proposed. And the dynamic life of the central swivel joint is calculated in the light of the calculation method for the life of knuckle bearing. After that, its static load capacity is checked according to the slewing bearing. The fatigue life of the central swivel joint is predicated by using the strain fatigue method in nSoft based on the finite element stress analysis.Finally, based on the method of full stress optimizing design, the parameters of section dimensions are defined as design variables, the strength condition is defined as constraint condition and the volume of model is defined as objective function, and then structure optimization for body structure is performed in ANSYS. The rational designing results have reached by comparing the optimal results, which reduce design cost and improve efficiency.