This utility model discloses a
stock solution injection pump, including a pump housing, a drive mechanism, and a pump
piston. The pump housing has a pump inlet and a pump outlet. The pump
piston is driven by the drive mechanism to move up and down in the pump housing. It also includes a limit detection mechanism, which includes an upper limit detection sensor, a
lower limit detection sensor, and a detection strip. The detection strip moves up and down synchronously with the pump
piston and cooperates with the upper and
lower limit detection sensors. This utility model has the advantages of simple structure, good liquid flow rate accuracy control, and improved working reliability.