Present foam pumps all adopt metal springs as reset parts. After the liquid is taken out, each part of the foam pump returns to its original position due to the recovery of deformation of the metal springs. However, when the foam pump is discarded and needs to be recycled since the foam pump is made of plastic materials except for the metal spring when recycling, it is necessary to disassemble the entire foam pump first, and then disassemble the metal spring and other materials of the foam pump. Recycling separately makes the whole recycling work cumbersome, increases working hours, and reduces work efficiency.

The external foam pump uses elastic parts made of recyclable elastic materials. When the head is pressed down, the pressure of the head drives the piston to press down, so that the elastic parts are deformed and the inner space of the cylinder is fully compressed, so that the gas in the cylinder enters At the mixing part, at the same time, one end of the piston enters the small barrel of the barrel body and drives the pull rod to move towards the straw. The liquid enters the mixing part through the gap between the piston and the pull rod, and the foam flows out from the press head. Since the elastic part is made of recyclable elastic material, Therefore, it can be recycled together with the foam pump during recycling, which is simple and convenient, and improves work efficiency; moreover, the elastic part deforms and fully fills the inner space of the barrel, allowing more gas to enter the mixing part, making the extruded foam more effective it is good.