Drill bit for heat exchange tube and using method thereof

Abstract

The invention relates to a drill bit for a heat exchange tube. The drill bit comprises a drill bit body and at least one cutting blade, wherein the drill bit body is a cylinder, and the cutting blades are arranged along the circumferential direction of the drill bit body; a bevelling angle is arranged on the inner wall of one end of the drill bit body; the ends, close to the bevelling angle of the drill bit body, of the cutting blades are cutting edges which extend out of the inner wall of the drill bit body in the radial direction of the drill bit body; the bevelling angle of the bit drill body extends to the cutting edges of the cutting blades; an inclined face of the bevelling angle of the drill bit body is used for abutting against the ends of fixedly-arranged heat exchange pipes, the drill bit body moves in a direction close to the heat exchange pipes till the cutting edges of the cutting blades abut against the ends of the heat exchange pipes, and the drill bit body and the heat exchange pipes are arranged along the same axis; and the drill bit body drives the cutting blades to rotate so as to cut the end of the heat exchange pipes. The invention further provides a using method of the drill bit for the heat exchange tube. The drill bit has the beneficial effect that coaxial arrangement of the heat exchange pipes and the drill bit body can be automatically completed; and the lengths of the heat exchange pipes exceeding a tube plate are consistent.

Description

technical field [0001] The invention relates to the technical field of heat exchange tubes, in particular to a drill bit for heat exchange tubes and a usage method. Background technique [0002] The heat exchange tube assembly includes a heat exchange tube and a tube sheet sheathed on the outer periphery of the heat exchange tube. After the heat exchange tube is assembled with the tube sheet, the length of the heat exchange tube beyond the tube sheet is uneven. Therefore, the end of the heat exchange tube needs to be drilled so that the length of each heat exchange tube beyond the tube sheet is consistent. In order to facilitate subsequent welding of the tube sheet. In the prior art, hand-held twist drills are commonly used to cut the ends of the heat exchange tubes, but this cutting method has the following problems: [0003] (1) Manual operation, low cutting precision, it is difficult to ensure that the length of the heat exchange tube beyond the tube sheet is consistent...

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a drill bit for heat exchange tubes and its use method, which solves the problem of using a hand-held twist drill bit to cut the end of the heat exchange tube: it is difficult to ensure that the heat exchange tube The length beyond the tube sheet is consistent, the positioning accuracy is high, and the technical problems are difficult to operate

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