Design Of Virtual Prototype Of The Workover Rig Operating System And Analysis Of Relevant Components

The majority of workover rigs in China are still operated manually at present. Such mode of operation requires great labor intensity and is usually accompanied by hazards. Therefore, it is currently quite necessary to design an automatic operating system. The vehicle-mounted workover rig operating system designed by the paper is the main bearing system and the operation system of vehicle-mounted workover rigs which primarily consists of the truss, chain wheel bracket, the elevator system, the slip system, blowout preventer, the derrick system etc.After collecting and analyzing current development of workover rigs at home and abroad, the paper designs several important systems of the vehicle-mounted workover rig operating system. The paper mainly uses SolidWorks to conduct a 3D modeling of the main systems making up the operating system, assembles them and establishes a virtual prototype of the operating system. And then establishes the finite element model of the truss based on the designed truss scheme, utilizes Concise architectural design manual to calculate wind loads of three windward faces of the truss, applies the finite element software to conduct a static analysis of windward faces of the truss respectively, obtains the stress and displacement nephogram of each windward face, and then conducts an overall check of them. In the end, stipulations in Code of Steel Structure Building Design(AISC-360-05) are used to verify the units with the maximum force, namely No. 4, No. 74 and No. 8.With the finite element method, the paper makes a modal analysis and buckling analysis of the truss itself, finds the inherent frequency and basic vibration mode of the truss structure through modal analysis, locates the weaknesses of the truss and works out the way to avoid resonance occurred during the operation. The critical load of the truss is gained by the buckling analysis and as indicated by the data comparison, the axial load of truss is smaller than its critical load, which provides basis for the safe use of the truss.In the end, by carrying out a motion simulation of the vehicle-mounted workover rig operating system and applying the ADAMS software to make a kinematic analysis of the lifting process of the operating system, the paper obtains the curve showing how the force at the 9th and 10 th points of the joint between the truss and the derrick changes as the angle changes, providing further basis for structure design and improvement of the operating system.