Small-caliber tube inner wall powder electrothermal explosion spraying device

Abstract

The invention relates to a small-caliber tube inner wall powder electrothermal explosion spraying device which is used for implementing complete tube inner wall spraying on a long tube with the minimum caliber of 35mm. The small-caliber tube inner wall powder electrothermal explosion spraying device is composed of a conductive gun head, a low-voltage electrode (6), a high-voltage electrode (7), a conductive connector, a powder delivery tube (1) and a support sleeve (10), wherein the conductive gun head is in the shape of a circular tube composed of a semicircular-tube-shaped low-voltage conductor and a semicircular-tube-shaped high-voltage conductor; the low-voltage electrode (6) is installed in the low-voltage conductor; the high-voltage electrode (7) is installed in the high-voltage conductor; the conductive connector is in the shape of a semicircular tube and is coaxial with the conductive gun head; one end of the conductive connector is connected with the conductive gun head, and the other end is connected with the two poles of an energy storage capacitor; the powder delivery tube (1) is provided with a powder receiving groove; metal powder (12) is spread in the powder receiving groove; the powder delivery tube (1) can extend into the circular tube formed by the conductive gun head and conductive connector; and the low-voltage electrode (6) and high-voltage electrode (7) perform gas discharge, so that the metal powder is exploded between the two poles.

Description

technical field [0001] The invention relates to an electric thermal explosion spraying device in the technical field of thermal spraying. Background technique [0002] Thermal spraying technology is widely used in the field of material surface protection due to its low cost, good coating performance, and on-site construction. The traditional thermal spraying technology is to heat and accelerate the spraying material in a gaseous fluid, so that the spraying material is completely atomized and then hits the substrate at high speed to form a coating (such as flame spraying, arc spraying, plasma spraying, etc.). However, this kind of method relying on flame flow or jet atomization and accelerating spraying materials must require a certain spraying distance to completely atomize and accelerate the spraying materials in order to obtain a coating with good performance and uniform appearance. For example, the best spraying distance of flame spraying is between 120-250mm, the best s...

AI Technical Summary

Problems solved by technology

However, my country's research in the field of electrothermal explosion spraying started relatively late, especially in the research and development of electrothermal explosion spraying devices for small-diameter tube inner walls.

The main problems include: (1) It is limited to spraying the inner hole of the part and the inner wall of the pipe with a short length, and it is impossible to make the device extend into a longer pipe for spraying; (2) Most of the spraying materials are metal wire or foil. The development of powder electric explosion spraying equipment is less, which limits the application range of electric thermal explosion spraying

Images