Concrete 3D printer nozzle

The concrete 3D printer nozzle comprises an inner cylinder and an outer cylinder, a first feeding port is formed in the upper portion of the inner cylinder, a discharging port and a spraying hole are formed in the bottom of the inner cylinder, and the spraying hole is formed in the edge of the bottom of the inner cylinder; the outer barrel is arranged on the outer side of the inner barrel, a material storage cavity is formed between the outer barrel and the inner barrel, an extrusion device is arranged in the material storage cavity, a second feeding port is formed in the upper portion of the outer barrel, the bottom of the outer barrel inclines inwards, and the edge of the bottom of the outer barrel and the inner barrel form a closed structure. The spray head can effectively solve the problem that an existing printing spray head is prone to being blocked or low in printing speed in the printing process. 本发明公开了一种混凝土3D打印机喷头，包括内筒和外筒，内筒上部设置有进料口一，内筒底部设置有出料口和喷孔，喷孔设置于内筒底部边缘；外筒，外筒设置于内筒外侧，外筒与内筒之间形成储料腔，储料腔内设置有挤压装置，外筒上