Metal round pipe contracting equipment

Abstract

The invention relates to the field of pipe fitting machining equipment, in particular to equipment for reducing the diameter of a metal round pipe, which comprises a door-shaped rack, an oil pressure device for providing power is fixed at the top of the door-shaped rack, and a metal pressing rod is fixedly connected to a piston on the bottom surface of the oil pressure device; the bottom end of the metal pressing rod is connected with an upper positioning die used for keeping the vertical position of the metal round pipe in a clamped mode. A lower die assembly is arranged in the middle of the door-shaped rack and comprises a pipe contracting die used for pipe contracting and a lower positioning die arranged on the pipe contracting die and used for containing a metal round pipe. The equipment has the beneficial effects that the mechanical structure is simple, the occupied space is small, the pipe wall of the contracted metal pipe is uniform, the surface is smooth and attractive, and cracks of the pipe wall caused by uneven heating in the heating process are avoided.

Description

technical field [0001] The invention relates to the field of pipe fitting processing equipment, in particular to a device for reducing the diameter of metal round pipes. Background technique [0002] PTC heating tubes are usually composed of PTC ceramic heating elements and metal outer sleeves. The PTC heating element has the advantages of small thermal resistance and high heat exchange efficiency. It is an electric heater with automatic constant temperature and power saving. In the process of making PTC heating rods, it is necessary to clamp the PTC heating sheet wrapped with insulating film between two semicircular metal electrodes to form a full circle and fit the metal outer sleeve on the outside. In order to facilitate assembly, the metal tube is required. The inner diameter is slightly larger than the outer diameter of its internal assembly parts. In order to improve the heat transfer efficiency between the internal heating element and the external environment, it is ...

AI Technical Summary

Problems solved by technology

However, the commonly used metal tube shrinking device currently uses a hydraulic pressure clamping machine. The hydraulic pressure clamping machine uses a multi-petal hydraulic head mold to simultaneously squeeze inwards and enclose it into a circle. The diameter of the circle is smaller than the processed pipe. In this way, the multi-lobed hydraulic mold simultaneously presses the inner metal tube to the center of the circle to achieve the purpose of reducing the tube diameter. The method of compressing the tube diameter in this way will cause the metal tube to The strength received by the tube is not uniform, and it will also cause uneven pressing in the gap where the metal tube contacts the petal mold, which not only affects the appearance of the metal tube, but also easily causes the metal tube to be heated during the heating process. Inhomogeneity, which in turn affects the safety of the PTC heating tube

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