▎ 摘　　要

NOVELTY - The device has a main valve portion (1) whose side is fixedly connected with a crude oil inlet pipeline (2). The surface of crude oil inlet pipeline is detachably installed with a fixing hoop (3), and the side of fixing hoop is fixedly installed with a graphene electric heating film (4). The side of graphene electric heating film is fixedly installed with a rotating soft rod (5), and the surface of rotating soft rod is winding with a steel wire traction rope (6). The surface of crude oil inlet pipeline is fixedly installed with a fixing ring (7), and the top portion of main valve portion is detachably installed with a connecting column (8). The top of connecting column is fixedly installed with a rotating plate (9), and the surface of connecting column is movably sleeved with a switch component (10). USE - Combined wellhead device of watering valve group with anti-freezing and blocking function used in production of oil field. ADVANTAGE - The water-mixing valve group combined wellhead device is provided with anti-freezing and blocking function. The combined wellhead device uses fixing hoop and rotating soft rod convenient to disassemble, simply installs graphene electric heating film on surface of the crude oil inlet pipeline, and uses the Zipper (RTM: Slide fastener) tooth to wrap the graphene electrothermal film to the pipeline, and reinforces the heat preservation effect. The smooth transportation of crude oil is ensured in the pipeline in the environment with low temperature, and the viscous crude oil entering into the watering valve to cause blockage is avoided. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the combined wellhead device of watering valve group with anti-freezing and blocking function. Main valve portion (1) Crude oil inlet pipeline (2) Fixing hoop (3) Graphene electric heating film (4) Rotating soft rod (5) Steel wire traction rope (6) Fixing ring (7) Connecting column (8) Rotating plate (9) Switch component (10)