Soil pressure balance shield machine back loading type cutter head foam spraying device

A dorsal-loading-type cutter head foam injection device of soil pressure balance shield machine in the technical field of tunnel driving, the dorsal-loading-type cutter head foam injection device of soil pressure balance shield machine is composed of cutter head front panel, steel pipe with spigot flange at inner hole, cutter head back panel, foam pipeline box with sealing threaded hole, sealing ring, sleeve with foam nozzle end opening, diaphragm, flange, gasket, sealing fixed plug, screw, foam, excavation tunnel face and tool; the spigot flange end of the steel pipe with spigot flange at inner hole is connected with the cutter head front panel; the other end is connected with the cutter head back panel; the foam pipeline box with sealing threaded hole is connected with the cutter head back panel; when they are connected, the steel pipe with spigot flange at inner hole is concentric with the foam pipeline box with sealing threaded hole and is enclosed in the steel pipe with spigot flange at inner hole with t