Automatic conveying device and maintenance method therefor

An automatic conveying device, comprising:

• a step drive wheel fixedly mounted at a first end of the automatic conveying device;
• a movable bracket arranged at a second end opposite to the first end of the automatic conveying device;
• a step driven wheel disposed on the movable bracket;
• a step chain coupled to the step drive wheel and the step driven wheel;
• a tensioning device that acts on the movable bracket to maintain the step chain in tension;
• a sensor device that detects a displacement of the movable bracket;
• and
• a processor configured to send a first warning signal when a single-trip displacement of the movable bracket exceeds a first threshold, and to send a second warning signal when a accumulative displacement of the movable bracket exceeds a second threshold.