Quantitative pump with external spring

The metering pump with the external spring comprises a cover body, a pressing column and a fixed installation shell, the fixed installation shell is arranged at the bottom of the cover body, the pressing column is arranged in the center of the fixed installation shell, a spray head is arranged on the right side of the pressing column, and a built-in connecting frame is arranged at the connecting position of the outer end of the pressing column and the fixed installation shell. A sealing connecting base is arranged at the joint of the bottom of the built-in connecting frame and the pressing column assembly, and a suction pipe is arranged at the bottom of the sealing connecting base. The pressing assembly is arranged to control the change of the pressure difference in the communicating pipeline, the amount of liquid entering the circulating pipeline is controlled by matching with the absolutely same movement amount of the two groups of inlet balls and outlet balls, the regulation and control of quantitative out