Cylinder shape pipe piece with inner harden layer and its production method and equipment

Abstract

The present invention relates to a cylindrical pipe with internal hardened layer, its production method and special-purpose equipment. Said cylindrical pipe has small wall thickness and long length, its pipe wall has internal layer and external layer with different hardness, the hardness of its internal layer is greater than that of external layer, and said pipe is applicable for conveying material with high frictional coefficient. Its production method adopts the mode utilizing frequency to control pipe movement and proper hardening temp. range, and is special-purpose equipment is simple in structure, stable in operation, and can accurately control hardening temp., pipe moving speed nad depth of hardened layer.

Description

technical field [0001] The invention relates to a quenching cylindrical pipe fitting, its quenching method and special equipment. The cylindrical pipe member comprises a concrete delivery pipe for construction site use, but the invention is not limited to concrete delivery pipes. The method and its special equipment are suitable for use in the quenching operation of cylindrical pipe fittings with large diameter, thin pipe wall and long length. Background technique [0002] In the prior art, the inner wall of the pipe is required to have a higher hardness for the concrete conveying pipe used in the construction site or the large-scale pipe fittings used in other similar engineering technologies, so as to slow down the abrasion of the inner wall of the pipe by conveying coarse-grained materials; at the same time, due to The pipe body is often subjected to external collisions during transportation or work, so the outer wall of the pipe is required to have the toughness to prev...

AI Technical Summary

Problems solved by technology

[0009] The first embodiment of this device is used for the flame heating and quenching process, but there are multiple defects as mentioned above in this method, especially it cannot be used for processing thin-walled pipes similar to the aforementioned concrete delivery pipes

[0010] The second embodiment of the above-mentioned device adopts the electromagnetic induction heating method, but there are following defects that are difficult to overcome in the implementation of this program: first, one end of the pipe to be processed is fixed by the clamping table 7, if the pipe 18 rotates during the processing, then Due to the long pipe fittings (generally 3-5 meters, some up to 6-7 meters), the other end will swing, that is, the rotation of the two ends of the pipe fittings is not concentric, although the guide wheel 5 can support the pipe fittings, Reduce the swing of the pipe fittings, but because the gap between the electromagnetic induction head and the inner wall of the pipe is very small (usually 2-3mm), even if there is a slight swing, it may come into contact with the pipe wall, resulting in a short circuit

It is difficult to improve work efficiency, and from a practical point of view, it is difficult to be recognized

[0011] Secondly, the rotation speed of the power motors of the two workbenches is constant, which is not conducive to arbitrarily adjusting the rotation speed according to the working conditions and workpiece conditions.

Although the workbench 20 adopts the gearbox 2 to adjust the rotation speed of the main shaft, its adjustment range is very limited and it is not practical

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