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The noise of the whole crane is reduced by adding a guide rail. The sliding door adopts modular design, and the DC motor and microcomputer control unit are controlled through data bus communication. It is automatically adjusted according to the weight of the door leaf and the speed of opening and closing the door. The door opening width can be adjusted arbitrarily between 25% ~ 90%, and the appropriate door opening and closing amplitude saves the flow of air flow, so as to achieve energy conservation and environmental protection. The whole line bus type self inspection system can detect and judge the damaged parts by itself for maintenance. A single microcomputer control device can control two sets of driving devices at the same time to pull the large door body to meet the needs of a variety of special places.