A dual-mode biological 3D printing head
assembly comprises a bottom plate, an in-place device, a
UV curing lamp, a normal-temperature printing head and a
thermal printing head are arranged on the bottom plate, and the normal-temperature printing head and the
thermal printing head are used for printing high-
viscosity materials; the bottom plate is further provided with a plurality of electromagnetic valves and a
control circuit board electrically connected with the electromagnetic valves, and the
control circuit board is used for spot-jet printing of low-
viscosity materials. A
nozzle is arranged at the bottom of the
electromagnetic valve, and a top inlet is communicated with the low-
viscosity charging
barrel through a gas path; the low-viscosity charging
barrel is sequentially communicated with a
proportional valve and an
air pump through an air path and is used for extruding and discharging materials to the
electromagnetic valve; a heating
assembly is arranged outside the
thermal printing head and comprises a heat conduction block, a heating rod and a
thermocouple are arranged on the heat conduction block, and a heat
insulation layer is arranged on the periphery. The utility model further discloses a dual-mode biological 3D printer with the printing head
assembly. According to the utility model, high-viscosity materials and low-viscosity materials can be printed at the same time, spot spraying and
extrusion are combined, the defect that the low-viscosity materials cannot be printed in a pure pneumatic
extrusion mode is overcome, and normal-temperature printing and heating printing can be realized.