Heating and pressurizing composite device for processing plastic-lined composite steel pipe

Abstract

The invention relates to the technical field of steel pipe machining, and discloses a heating and pressurizing composite device for plastic-lined composite steel pipe machining, which comprises a metal bottom plate, and a pressurizing device, a heating device and a clamping device are fixedly mounted on the metal bottom plate; the pressurizing device comprises a base, a mounting plate, a case, a motor, a threaded rod I, a closed box, a pushing and pressing plate, a connecting rod, a movable plate, a middle through pipe and a rubber ring, the bottom surface of the base is fixedly mounted on the top surface of the metal bottom plate, and one end of the mounting plate is fixedly connected with the top surface of the base. By arranging the pressurizing device, a motor drives a threaded rod to rotate to enable a movable plate and a pushing plate to move, air in a closed box is slowly compressed into a heated plastic pipe, and the problems that in a traditional pressurizing mode, a pressurizer is used for directly pressurizing the interior of the plastic pipe, the pressurizing speed is too high, and consequently the plastic pipe is prone to being exploded; therefore, the plastic lining failure is caused.

Description

technical field [0001] The invention relates to the technical field of steel pipe processing, in particular to a heating and pressing composite device for processing plastic-lined composite steel pipes. Background technique [0002] Plastic-lined steel pipes are based on galvanized seamless steel pipes and welded steel pipes. After removing the welding ribs on the inner wall, they are lined with food-grade polyethylene (PE) pipes of the same diameter as the galvanized pipe. The thickness of the polyethylene liner is in accordance with HG / T 20538-2016 standard, finally pressurized and heated for a certain period of time, it is an upgraded product of traditional galvanized pipe, the technology of plastic-lined steel pipe inherits the advantages of steel pipe and plastic pipe, and according to market demand, production process , Anti-corrosion measures, connection methods, cost-effectiveness and many other aspects are comprehensively analyzed and the pipes are designed reasona...

AI Technical Summary

Problems solved by technology

[0002] Plastic-lined steel pipes are based on galvanized seamless steel pipes and welded steel pipes. After removing the welding ribs on the inner wall, they are lined with food-grade polyethylene (PE) pipes of the same diameter as the galvanized pipe. The thickness of the polyethylene liner is in accordance with HG / T 20538-2016 standard, finally pressurized and heated for a certain period of time, it is an upgraded product of traditional galvanized pipe, the technology of plastic-lined steel pipe inherits the advantages of steel pipe and plastic pipe, and according to market demand, production process , Anti-corrosion measures, connection methods, cost-effectiveness and many other aspects are comprehensively analyzed and the pipes are designed reasonably. Therefore, the pipes have many technical characteristics and are widely used in the cold and hot water supply systems of various buildings. The connection methods include special snap ring connections, Groove (clamp) connection or thread connection, the construction process is similar to the groove connection of steel pipe and the thread connection of steel pipe. With the popularization of people's environmental protection awareness and health awareness, new environmental protection water supply pipes have sprung up like mushrooms after rain. There are so many varieties that it is difficult to enumerate. Plastic-lined steel pipes inherit the respective advantages of steel pipes and plastic pipes, while abandoning their respective shortcomings. One of the most important contents in pipe design is to reasonably determine the wall of the pipe according to the conditions and requirements of use. At the same time, this parameter directly affects the cost performance of the product. The unique wall thickness design of the plastic-lined steel pipe includes the wall thickness of the inner plastic pipe and the outer wall thickness of the welded pipe, which determines a series of technical characteristics; the production process of the traditional plastic-lined composite steel pipe For pickling and derusting, hot-dip galvanizing, heating and pressurizing for plastic lining; the traditional pressurization method is to use a supercharger to directly pressurize the plastic pipe. Too fast a pressurization rate will easily cause the plastic pipe to burst, resulting in plastic lining. fail

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