Development On The Automatic Correction Control System Of Gantry-type Bucket Wheel Stacker And Reclaimer

Gantry-type bucket wheel stacker and reclaimer is a kind of special bulk cargostacking and reclaiming equipment，which has the advantage of simple mechanicalstructure，large capacity and high reclaiming rate，etc. It is an efficient and continuousstacking and reclaiming equipment for bulk materials，which has become one ofnecessary equipment for storage and transportation yard of major modernizationindustries.Gnaw rail of Gantry-type bucket wheel stacker and reclaimer is a commonphenomenon. Gnaw rail means the wheel rim contact the side of the rail because of thewheel running deviation in the traveling process of the gantry-type bucket wheel stackerand reclaimer and cause friction during operation， accelerate the rim wearing，causethe rim getting thin and exceed the prescribed standards or even the entire wheel earlyscrapped. The safe operation of the crane is greatly threatened；meanwhile， it will alsoincrease the operation and maintenance costs. Therefore， it is greatly significant toexplore the cause of the gnaw rail phenomenon so as to prevent and eliminate it.In order to solve the problem of graw rail in the process of the long travelmechanism of the gantry-type bucket wheel stacker and reclaimer traveling，this articleanalyzes the mechanical structure&working condition of Gantry-type bucket wheelstacker and reclaimer and finds out the reason which causes the gnaw rail. Based onthose results，we finish such a solution to prevent and eliminate gnaw rail. Analyizingthe side force and running state of Gantry-type bucket wheel stacker and reclaimer，wefinish a new plan of automatic correction control system.This system adapts advancedVVVF technology to realize both sides of the long travel operating stably andsimultaneously； using sensor technology to achieve accurate detection of the positionand the alignment； by adopting PLC programmable logic controller to achievepositional deviation calculation； by adopting HMI to read data signal and display fault diagnosis and also using the PROFIBUS-DP to achieve high-speed data communicationlink between PLC and VVVF，sensors as well as touch screen. It can be easilycombined with the original electrical circuit and does not affect the normal operation ofthe original system； it can PID automatically rectify the traveling position deviationof long travel to eliminate gnaw rail. Automatic correction control system ofGantry-type bucket wheel stacker and reclaimer has a certain reference value for otherautomatic correction control system of similar mechanical traveling equipment.The innovation of this subject is based on two ideas，one is VVVF correctivecontrol of the position deviation and dynamic position correction，whose design conceptcan achieve to control the traveling of the long travel synchronously， and to eliminatethe cumulative deviation of the encoder； the other is using digital connection controlprograms of the PROFIBUS-DP communication technology to achieve the requirementof the automatic correction system for data communication，real-time，detectingaccuracy and anti-jamming.This automatic correction control program has been formally put into productionand used widely to prove the feasibility and effectiveness of automatic correctioncontrol system of gantry-type bucket wheel stacker and reclaimer.