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We inivented automatic girth seam grinderas perthe construction requirements and features. It is hung beside the panel on the support of steel frame and complete seam surface grinding work though the operation of grinding mechanism.It takes the above edge as railway, if travel frame is working. The speed of travel frame can be adjusted by speed adjustment controller. This speed is grinding speed. It has effectively resolved the problems of more staffing effort, low grinding efficiency, and large workload. It is an applied technology leap in highly-efficient development of construction.