CN-117732687-B - Bus bar electrostatic spraying process and device

CN117732687BCN 117732687 BCN117732687 BCN 117732687BCN-117732687-B

Abstract

The application relates to the technical field of electrostatic spraying, and particularly discloses a bus bar electrostatic spraying process and device. The method comprises six steps of bus bar acceptance and cleaning, non-spraying area protection, electrostatic spraying, coating leveling, cleaning and checking and curing, wherein the newly added coating leveling process is utilized to initially cure epoxy powder, and coating appearance checking and thickness detection are carried out.

Inventors

PENG SHUAI
WU GUANGDONG
LIANG QIWEN
WANG JIAN
LI HEYI

Assignees

贵州航飞精密制造有限公司

Dates

Publication Date: 20260505
Application Date: 20231220

Claims (7)

1. The bus bar electrostatic spraying process is characterized by comprising the following steps of: Firstly, bus bar acceptance and cleaning, namely blowing dust to the bus bar by using compressed air, checking the surface appearance of the electroplated bus bar after dust blowing, taking the bus bar with smooth surface and no bad appearance as acceptance, cleaning the accepted bus bar by using absolute ethanol solution after the acceptance is finished to remove surplus on the surface of the bus bar, and airing at room temperature; protecting the non-spraying area of the bus bar dried in the first step by using a high-temperature-resistant insulating tape; Opening a powder electrostatic spraying combined device, adjusting the distance between a spray gun and a workpiece to be 100-200 mm, controlling the current to be below 30 mu A in a constant current state or controlling the voltage to be below 70kV in a constant voltage state, and starting to spray epoxy powder on the bus bar until the bus bar does not adsorb the powder; fourthly, leveling the coating, namely feeding the sprayed bus bar into a leveling device for leveling, wherein the leveling temperature is controlled to be 100-130 ℃, and the rotating speed of the bus bar in the leveling device is 30-40r/min when the bus bar is leveled; Cleaning and checking, namely cleaning a high-temperature adhesive tape on the bus bar, and performing apparent checking on the bus bar after being leveled, wherein the bus bar with apparent coating-free leakage points and defects is qualified in checking; Step six, curing, namely sending the bus bar which is checked to be qualified in the step five into curing equipment for high-temperature curing, wherein the curing temperature is 170-190 ℃; The defective bus bar in the step five is sent to a de-coating process, a cleaning agent and a tool are used for removing the coating completely in the de-coating process, and the bus bar with the coating removed completely is sent to the step one, and the step one to the step six are repeated; the powder electrostatic spraying combined device comprises a frame, an electric system arranged on the frame, a powder supply system electrically connected with the electric system, and a manual high-pressure powder gun for endowing epoxy powder in the powder supply system with negative charges, wherein the powder supply system comprises a powder suction device for adjusting the suction amount of the epoxy powder.
2. The electrostatic spraying process for bus bars according to claim 1, wherein the powder suction device comprises a conveying gas channel for conveying gas, the conveying gas channel is of a venturi structure with two ends larger than a middle throat, and the middle throat of the conveying gas channel is communicated with the powder suction channel and the dilution gas channel.
3. The electrostatic bus bar spraying process according to claim 1, wherein the powder supply system further comprises an oil-water separation pressure reducing valve for removing oil and water from the external compressed air.
4. An electrostatic bus bar spraying process according to claim 3, characterized in that the oil-water separation pressure reducing valve is connected with a gas dividing valve for dividing the compressed air into four streams.
5. The electrostatic bus bar coating process of claim 1, wherein the melting temperature in the fourth step is 120 ℃.
6. The electrostatic spraying process for bus bars according to claim 1, wherein the leveling device comprises a hinge conveyor belt for conveying the bus bars, the hinge conveyor belt is arranged at the top of the leveling device, a conveying block clamped with the hinge conveyor belt is arranged on the hinge conveyor belt, and a bus bar hanging device for hanging the bus bars is arranged at the lower end of the conveying block.
7. The electrostatic spraying process of bus bar according to claim 6, wherein the transmission block is provided with a driving motor for driving the bus bar to hoist and rotate.

Description

Bus bar electrostatic spraying process and device Technical Field The invention relates to the technical field of electrostatic spraying, in particular to a bus bar electrostatic spraying process and device. Background Bus bars are a common electrical component in power supply systems, which are mainly composed of metal or conductor in a multi-layer laminated structure, which can greatly reduce the number of cable connections, collect and connect current, and are mainly used for carrying and distributing electric energy, and are important components in modern power supply systems. In the field of aviation, bus bars are widely applied, are key components of an aircraft power system for outputting, transmitting and distributing power to various electrical equipment, and have important roles and functions on the aircraft. On a large-scale passenger plane, the power distribution system of the aircraft transmits power through various bus bars, but in recent years, the fixed weight of the aircraft is continuously reduced, the occupied volume of each part of the power supply system is correspondingly reduced, in order to save space, the power system of the aircraft has to adopt a multi-line parallel structure, the structure causes the bus bars in unit volume to have larger passing current, and the voltage difference between the bus bars is correspondingly increased, so that the bus bars are easier to break down air to generate short circuit, and therefore, the aviation field has to put higher requirements on the insulation property of the bus bars. In order to meet the requirement of the aviation field on the insulativity of the bus bar, enterprises usually use epoxy powder to spray the electroplated bus bar to form an insulating coating, after the coating is sprayed, in the bus bar electrostatic spraying technology in the prior art, the sprayed bus bar can be completely combined with the bus bar after high-temperature baking, but the baked coating has strong adhesive force and complete powder combination, if the thickness of the coating cannot meet the requirement after one-time spraying, or the bus bar needs to be reworked due to unqualified appearance quality of the coating, the coating tightly combined with the bus bar causes high difficulty in removing the coating, excessively long consumption time and seriously influences the production progress. Disclosure of Invention The invention aims to provide a bus bar electrostatic spraying process and device, which are used for solving the technical problems that unqualified bus bars in the prior art are tightly combined with a coating, so that the difficulty of removing the coating is large, the consumed time is too long, and the production progress is seriously affected. In order to solve the problems, the invention adopts the technical proposal that the bus bar electrostatic spraying process The method comprises the following steps: Firstly, bus bar acceptance and cleaning, namely blowing dust to the bus bar by using compressed air, checking the surface appearance of the electroplated bus bar after dust blowing, taking the bus bar with smooth surface and no bad appearance as acceptance, cleaning the accepted bus bar by using absolute ethanol solution after the acceptance is finished to remove surplus on the surface of the bus bar, and airing at room temperature; protecting the non-spraying area of the bus bar dried in the first step by using a high-temperature-resistant insulating tape; Opening a powder electrostatic spraying combined device, adjusting the distance between a spray gun and a workpiece to be 100-200 mm, controlling the current to be below 30uA in a constant current state, or controlling the voltage to be below 70KV in a constant voltage (conventional) state, and starting to spray epoxy powder on the bus bar until the bus bar does not adsorb the powder; Fourthly, coating leveling, namely feeding the sprayed bus bar into a leveling device for leveling, wherein the leveling temperature is controlled to be 100-130 ℃, and the rotating speed of the bus bar in the leveling device is 40r/min when the bus bar is leveled; step five, cleaning and checking, namely cleaning a high-temperature adhesive tape on the bus bar, and performing apparent checking on the bus bar after being leveled, so as to ensure that apparent leakage points and defects are avoided; Step six, curing, namely sending the bus bar which is checked to be qualified in the step five into curing equipment for high-temperature curing, wherein the curing temperature is 170-190 ℃; And (3) feeding the defective bus bar in the step five into a de-coating process, wherein the coating is removed cleanly by using a professional cleaning agent (JX-1) and a tool in the de-coating process, and feeding the bus bar with the cleanly removed coating into the step one, and repeating the step one to the step six. The beneficial effects of this embodiment lie in: 1. In the prior art, after the spraying of the e