Pressure gauge shell cap screwing machine

The invention relates to the technical field of cap screwing machines, in particular to a cap screwing machine for a pressure gauge shell. A cover screwing machine for a pressure gauge shell comprises a limiting mechanism and an adjusting mechanism. The limiting mechanism comprises a plurality of fan-shaped circular ring sliding blocks. The adjusting mechanism comprises a shell, a first half gear, a second half gear, two first racks and two second racks. The pressure gauge comprises an upper cover and a bottom cover. The lower end of each first rack is used for abutting against one fan-shaped circular ring sliding block, and the lower end of each second rack is used for abutting against one fan-shaped circular ring sliding block. The first rack and the second rack rotate reversely to enable the upper cover to deflect to be coaxial with the bottom cover, the shell rotates forwards, the upper cover is rotated to enter the bottom cover, and screwing is completed. The invention provides a cover screwing machine f