Device for locking or unlocking tripod of measuring instrument

The invention discloses a device for locking or unlocking a tripod of a measuring instrument. The device is characterized by comprising a rivet hole (screw hole), a rivet (screw), a stainless steel sheet A, a shell, a spring upper movable iron ring, a spring lower fixed iron ring, a spring, a lock cylinder, a lock cylinder wrench slideway, a lock cylinder wrench, a stainless steel sheet B and a stainless steel sheet C, when the locking or unlocking device of the measuring instrument tripod is installed, the center of the device and the center of the measuring instrument tripod are located on the same vertical line. When the tripod is folded or unfolded, the lock cylinder wrench is pressed down along the slide way by hand and is slightly pushed rightwards, and the tripod is locked. And the lock cylinder is automatically lifted along the slide way and the foot stool is opened when the lock cylinder is slightly pushed to the left side. Therefore, the effect of quickly opening or quickly locking the tripod is ach