Telescopic steering swing arm shaft

The telescopic steering swing arm shaft comprises a telescopic module, a push-pull module and an air inlet module, the telescopic module comprises an inner column and an outer cylinder which is detachably installed in the inner column and extends to the top of the inner column, and an oil cavity, an oil collecting chamber, an air cavity and an installation cavity are formed in the outer cylinder; and the push-pull module comprises an elastic cushion mounted in the mounting cavity. According to the utility model, after the plate body is extruded by the clamping plate, the plate body transmits extrusion force and upward or downward force to the cylinder, the cylinder transmits the received force to the spring, the spring enables the cylinder to drive the piston rod to reciprocate up and down, then air generated in the air cavity is conveyed to the oil cavity through the U-shaped pipe, and the pressure in the oil cavity is increased; lubricating oil in the inner column is transmitted to the sponge through the th