A portable low-pressure cold spraying device

Abstract

Belonging to the technical field of cold spraying equipment, the invention relates to a portable low pressure cold spraying device. One end of a first powder feeding pipe is in pipeline connection with a powder feeder through a rubber pipe, and the other end is embedded in a nozzle. A heater is mounted below the nozzle, which is a coaxial downstream powder feeding nozzle structure or a lateral downstream powder feeding nozzle structure. When the nozzle is a coaxial downstream powder feeding nozzle, the nozzle and the heater are in a vertical state; and when the nozzle is a lateral downstream powder feeding nozzle, the nozzle and the heater are in a parallel state. The heater bottom is connected to a temperature control system. A heat supply pipeline and the heater are in fixed connection, compressed air enters the heater through the heat supply pipeline. The portable low pressure cold spraying device has the advantages of simple structure, reliable principle, convenient operation, and environmental friendliness.

Description

Technical field: [0001] The invention belongs to the technical field of cold spraying equipment, and relates to a portable low-pressure cold spraying device for on-site construction of anti-corrosion coating preparation and damaged parts repair, which is suitable for supersonic spray guns used at 0.8-1.5 MPa, and improves the deposition efficiency of materials. Background technique: [0002] Russian patent 1674585, U.S. patent 6502767 "advanced coldspray system", U.S. patent 6759085 "methodsandapparatusforlowpressurecoldspraying" and Chinese patent ZL00253384.7 "supersonic cold spraying device" all disclose low-pressure cold spraying equipment and methods of use thereof. The low-pressure cold spraying equipment disclosed in these patents The unique heater and supersonic nozzle are integrated together to reduce the loss of heat in the pipeline, maximize the maximum electrical input power in the smallest volume, and meet the spraying requirements; at the same time, through the ...

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Problems solved by technology

[0002] Russian patent 1674585, U.S. patent 6502767 "advanced coldspray system", U.S. patent 6759085 "methodsandapparatusforlowpressurecoldspraying" and Chinese patent ZL00253384.7 "supersonic cold spraying device" all disclose low-pressure cold spraying equipment and methods of use thereof. The low-pressure cold spraying equipment disclosed in these patents The unique heater and supersonic nozzle are integrated together to reduce the loss of heat in the pipeline, maximize the maximum electrical input power in the smallest volume, and meet the spraying requirements; at the same time, through the downstream siphon powder feeding, the powder is transported from the It is fed into the downstream stable negative pressure area, and cooperates with the solenoid valve to automatically control the amount of powder to ensure uniform coating quality. This structure does not need to use a special powder feeder, which reduces the complexity of the structure and simplifies the equipment. The spraying equipment can process aluminum , zinc, nickel, tin and copper alloys and their composite materials, etc., the gas flow rate covered by the patent is 15m 3 -20m 3 , because the acceleration ability is lower than that of ordinary high-pressure cold spray equipment, its deposition is mainly activated by adding oxide materials, and the efficiency is only 20% under typical process conditions; from the perspective of portability and coating performance, the existing Commercial cold spray equipment has met the requirements of various on-site construction, but the utilization rate and deposition efficiency of materials are very low. The main disadvantage is that the deposition efficiency is too low. Its weight and volume are required to be small enough, which leads to the limitation of heater power input; second, the heater does not ensure the low temperature of the surface of the heater through heat insulation but heat dissipation through space, resulting in low heat utilization efficiency; third, the small air flow leads to The pressure of the front air chamber cannot be increased, which limits the acceleration ability of the airflow and also limits the deposition efficiency; fourth, the continuous spraying time of the existing equipment is limited by the rapid wear of the nozzle, and cannot be processed continuously for a long time; fifth, the deposition efficiency is only 20% It leads to low construction efficiency and prolongs the construction period; Sixth, the heater is heated by electric heating wire, which is easily damaged and complicated to assemble. The surface oxidation process is used for insulation treatment, which requires high packaging requirements

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