Mechanical Characteristics On Movement Of On-line Detection Device Drive System In The Gas Pipeline

Drive system design of on-line detection device is the key technology to realize gas pipeline in-line detection, and the important factor to ensure the authenticity of the test result of gas pipeline. This article aims to study all kinds of factors which impact the stable operation in the gas pipeline of on-line detection device, obtain the relationship between the range of various parts of the structure and the drive pressure, in order to provide the theoretical basis for the speed control of on-line detection device.Firstly, at the base of analyzing the physical model of on-line detection device, establish force analysis simplified model and equation of motion of gas pipeline on-line detection device, obtain that the frictional resistance during moving depends on the structural design of drive cuffs. Meanwhile by analyzing the climbing ability, obstacle capability and capacity through the corners, obtain the corresponding mathematical model.Secondly , establish drive cuffs model with rigid bottom, by solving the frictional resistance, obtain the relationship between pressure needed and structure design of drive cuffs when the device are moving stably in the gas pipeline. Design a model with rigid bottom, according to the procedure results to design the drive cups model whose bottom is the rigid body. Under different condition try the on-line detection device model with drive of the rigid bottom in the structure of the test stand. Compare the data obtained from a large amount of experimental data and theoretical calculations data, in order to improve the correctness of the theory obtained.Lastly, by solving frictional resistance of all kinds of drive cuffs in motion, establish the equations of motion and scheduled procedures when the on-line detection device with all kinds of drive cuffs is moving in the horizontal and the rugged gas pipeline, Through analyzing the curve output of the scheduled procedures, when different drive cuffs were selected, structural design of the drive cuffs, roughness of the pipeline, obstacle in the pipeline and so on impact the driving pressure that needed by the on-line detection device when it's moving stably in the gas pipeline. Obtain range of various parts of the structure, when different drive cuffs are selected. In addition, by analyzing the stop and the start situation of on-line detection device, grasp the start and the stop law of on-line detection device, calculate the time of supplying a large number of gas before the device start, in order to guarantee that the device is not pushed back against when the valve is opened.