Crushing and grinding device, a soybean milk maker including said device and a method for making soybean milk

A soybean milk maker, comprising:

• a milk-producing section including a crushing and grinding device, said crushing and grinding device comprising a motor, a hopper, a crushing and grinding unit, and a material recycling part, said material recycling part comprising a pump and recycling ducts downstream of said crushing and grinding unit, said crushing and grinding unit comprising a coarse-crushing section and a fine-grinding section, wherein said fine-grinding section comprises a stationary grinder and a rotary grinder, said coarse-crushing section is located in a chamber of the stationary grinder, and said coarse-crushing section includes a crushing blade, wherein a gap between the outer side surface of the crushing blade and the inner surface of the stationary grinder chamber gradually decreases in a direction of rotation of the crushing blade from a leading portion of the crushing blade to a base portion of the crushing blade, thereby forming a crushing chamber;
• a milk-boiling section comprising an electrical heating device and a boiling cup;
• and
• a circuit control system comprising a control circuit board and a control valve assembly.