Agricultural plant protection machines and diaphragm pumps thereof

An machine for plant protection, comprising

• a frame;
• a liquid storage tank to store a solution;
• at least one pipe connected to the liquid storage tank;
• a spray assembly;
• and
• a diaphragm pump connected between the liquid storage tank and the spray assembly via the at least one pipe, the diaphragm pump including:
• a pump body including a containing cavity;
• at least one pump cover on the pump body;
• at least one diaphragm in the containing cavity coupled with the at least one pump cover to form at least one cavity;
• and
• a driving mechanism in the containing cavity, including:
• a coil assembly,
• an elastic reset member, and
• a push rod being connected to the at least one diaphragm and the elastic reset member, wherein:
• the push rod is configured to make a reciprocating linear motion when the coil assembly being powered on and off alternately, to drive the at least one diaphragm to reciprocate relative to the at least one pump cover to reduce or enlarge the at least one cavity,
• the push rod is configured to move in a first direction under a magnetic attraction force of the coil assembly when the coil assembly being powered on, and
• the push rod is configured to move in a second direction opposite to the first direction under an elastic force of the elastic reset member when the coil assembly being powered off.