The invention discloses an adjusting screw mechanism. The mechanism is characterized in that a
gasket is fixedly arranged on an adjusting screw, a flat
tail of the adjusting screw is arranged in a square hole of an inner adjusting
handle, a pin is arranged in the inner adjusting
handle and is matched into a
waist-shaped hole of the adjusting screw, and the pin is fixed to the inner adjusting
handle by tightening a screw. A positioning spring, a positioning pin and a
steel ball are sequentially arranged in a
blind hole of the inner adjusting handle, the spring tightly presses the positioning pin, the
steel ball placed in a positioning pin hole makes contact with a triangular inner tooth bevel groove of a hand wheel base, external threads of the adjusting screw for
assembly are in threaded connection with internal threads of the hand wheel base, external threads of a hand wheel check ring are in threaded connection with the internal threads of the hand wheel base, the inner adjusting handle is limited, and the hand wheel check ring is fixed to the hand wheel base by tightening a screw, an outer adjusting handle is fixed to the inner adjusting handle by tightening a screw, an inner sealing ring is arranged between the hand wheel base and the inner adjusting handle, and an outer sealing ring is arranged between the hand wheel base and the outer adjusting handle. The mechanism has the advantages of being easy to assemble, good in stability, convenient to use and high in precision.