Adjusting hand wheel set having zero position limiting function and sight

An adjusting hand wheel set having a zero position limiting function, comprising an adjusting hand wheel, a zeroing screw, a hand wheel seat, a hand wheel buckle cover, an adjusting base and an adjusting screw, wherein the adjusting base is nested in the hand wheel seat, the adjusting base and the hand wheel seat are provided with mutually matched tooth connection surfaces respectively, an upper end of the adjusting screw is in embedded running fit and connection with the adjusting base, a middle portion of the adjusting screw is in threaded connection with the hand wheel seat, the hand wheel buckle cover is disposed on the hand wheel seat and fixedly connected to the hand wheel seat, an outer wall of the adjusting hand wheel is provided with a graduated scale, and the adjusting hand wheel is locked and connected with the adjusting base through the zeroing screw, wherein

• a linkage ring is disposed in the adjusting hand wheel and fixedly connected to the adjusting hand wheel, a linkage protrusion integrally formed with the linkage ring is disposed on an outer wall of the linkage ring along any radius direction of the linkage ring, and the linkage protrusion on the linkage ring is aligned with a zero position of the graduated scale on the outer wall of the adjusting hand wheel;
• the adjusting hand wheel set further comprises a stop ring, an upper port of the stop ring is internally provided with a ring surface integrally formed with the stop ring, the ring surface is provided with a linkage groove along any radius direction of the ring surface, and a first limit protrusion is disposed on a bottom surface of the ring surface at the edge of one side of the linkage groove;
• the stop ring is nested on the hand wheel buckle cover and is in threaded connection with the hand wheel buckle cover;
• after the adjusting hand wheel is locked with the adjusting base, the linkage protrusion is embedded in the linkage groove;
• a top surface of the hand wheel buckle cover is provided with a second limit protrusion, and when the stop ring is screwed on the hand wheel buckle cover until the first limit protrusion and the second limit protrusion form a limit, the linkage groove is located over the second limit protrusion.