Four-connecting-rod overturning type anti-step-missing automatic telescopic pedal device for clearance compensation of gate door

The invention discloses a four-connecting-rod overturning type anti-step-missing automatic telescopic pedal device for clearance compensation of a gate door. One side of a telescopic pedal assembly isconnected with a fixed doorsill through a sliding block connecting rod, the other side of the telescopic pedal assembly is connected with a four-connecting-rod driving mechanism, the four-connecting-rod driving mechanism is connected with a gear driving assembly, the gear driving assembly is located below the fixed doorsill, the four-connecting-rod driving mechanism and the gear driving assemblyare arranged in a bearing bracket assembly, and the bearing bracket assembly is connected with the four-connecting-rod driving mechanism. While meeting a clearance, the gear driving assembly drives the four-connecting-rod driving mechanism to drive the telescopic pedal assembly to turn out upwards so as to compensate a clearance between the gate door and a vehicle door; when the vehicle is drivenout of a stander, the motor