Connecting device for air suspension axle and front support of semitrailer

The utility model relates to a semitrailer air suspension axle and front support connecting device which is characterized in that oval holes (6) are correspondingly formed in the left side and the right side of a front support (1), guide blocks (2) are symmetrically fixed to the two sides of the oval holes (6), a sliding block (3) is arranged between the guide blocks (2) and fixed to the front support (1), an inclined rectangular hole (31) is formed in the sliding block (3), and a movable pin bush (4) is embedded in the inclined rectangular hole (31); the guide arm (7) is arranged between two side plates of the front support (1), the pin shaft (5) sequentially penetrates out of the movable pin sleeve (4) on one side, a hole in the guide arm (7) and the movable pin sleeve (4) on the other side, and the guide arm (7) and the two side plates of the front support (1) are connected into a whole in a penetrating mode. The pin sleeve is in surface contact with the pin shaft, and the sliding block is in surface conta