Research On Rust Uniformity Of Mechanical Inner Wall Of Elbow And Simulation Analysis Of Removal Effect

The small diameter metal pipes can be seen everywhere in modern industry and production,and are usually used to transport liquids,gases and some solid particles.These pipes are usually exposed to air and contacted with external environment,lead to serious corrosion of metal pipes.By using the method of pipe internal coating can improve the corrosion resistance of pipelines,but the coating must be cleaned including the pipe surface rust,dirt and other impurities.The commonly used methods of pipeline rust removal are as follwing:high pressure water jet method,sand blasting method,chemical method and so on,these methods can not guarantee the evenness of rust removal at elbow bend,the uniformity of rust removal at elbow bend can greatly improve the service life of elbow.This paper is mainly aimed at the problem of rust removing nonuniformity of mechanical mechanism,which used for rust removal inside small diameter bends,through the design of the grinding block structure part of the rust removing mechanism that ensure the mechanical descaling mechanism can uniformly remove the rust layer of the elbow bend,and through simulation to verification the rust removing mechanism can pass through the elbow smoothly.through coordinate the motion parameters of derusting mechanism at straights and corners,to ensure that the rust removing mechanism has the same rust removing area at the elbow straight road and the bend road,in order to improve the rust removal efficiency of the rust removing mechanism.Finally,the derusting efficiency of the rust removal mechanism is analyzed by simulation,and it provides a reliable theoretical basis for the commissioning of the derusting mechanism.The main contents of this paper are as follows:Firstly,aiming at the problem of rust removing nonuniformity of mechanical mechanism used for rust removal inside the small diameter bend pipe at present stage,the general equation of the block structure is derived through theoretical calculation,to ensure the uniformity of rust removal at the bend of the bend.And the correctness of the general equation of the obtained block structure is verified,to design the structure of the grinding block,and kinematics and dynamics simulation of this mechanism is carried out by motion simulation software ADAMS,to obtain the curves of displacement and speed of each rust removing mechanism in the specific elbow,by analyzing the movement of the derusting mechanism in the elbow,the rationality of the designed block structure is verified,and it provides theoretical support for the production of rust removing device of mechanical pipe inner wall.Secondly,the coordination of motion parameters of rust removal mechanism at elbow straight road and bend road.The motion parameters of the rust removing mechanism include the speed n of rust removing mechanism and the feed speed V_f of the rust removing mechanism,through give the theoretical derivation of relation formula between motion parameters of rust removal mechanism,to coordinate the motion parameters of the derusting mechanism,to ensure the rust removing mechanism has the same rust removing area at the elbow straight road and the bend road,in order to improve the rust removal efficiency of the rust removing mechanism,and verify the relation of motion parameters by examples.Thirdly,the simulation analysis of derusting effect of rust removal mechanism by finite element analysis software ABAQUS,to analysis the difference between normal grinding force and theoretical value obtained by simulation,and through an example to calculate the rust removal area of the rust removal mechanism,to obtain the rust removal effect of this rust removing mechanism.