Through water cooling appts. suitable for producing diameter-50mm rebar

The utility model discloses a water passing cooling device that is applicable for the manufacturing of ????50mm screw steel. An inlet duct, a water inlet section, a cooling section, a water discharge section, an outlet duct and a air seal section are arranged in sequence according to the conveyance direction of rolling pieces; the inlet duct is positioned at the front section of the water inlet section; the water inlet section is composed of a water inlet, a water inlet tank and a cooling water nozzle, wherein: the cooling water nozzle is arranged in the circumferential direction with certain angle to the rolling line in the water inlet tank; a duct is also positioned in the water inlet tank; the cooling section, which is positioned at the rear section of the water inlet section, is composed of a backwater tank and a water discharge pipe, wherein: the backwater tank is connected to the water inlet section via a backwater pipe; the outlet duct is positioned in between the backwater tank and the air seal section; the air seal section is composed of an air intake, an air seal box and a air blast nozzle; a duct is also positioned in the air seal box. The utility model can greatly improve the production technologies for large-size screw steel and better satisfy the requirements for the infrastructural construction of large-scale project.