Electrostatic spraying method is based on physical phenomena electrophoresis, the atomization of the paint particles in the DC high voltage field to bring a negative charge, and the role of the electrostatic field, the directional flows to the surface positively charged, and deposited by the form a uniform, attached to a solid thin film coating method.
Electrostatic spraying and general painting, spray painting or mechanical than can greatly improve the working environment of workers, so that mist is no longer flying into the air to ensure the health of workers. glue stick However, due to the operator in the electrostatic powder coating operation fails to national standards and norms for various reasons such operations, resulting in electrostatic spraying operations in fires, explosions and other fatal accidents occur frequently. Therefore, electrostatic powder coating to the prevention of accidents caused by the officer attention.
Electrostatic powder coating operation cause of the accident.
A combustible material powder.
Electrostatic powder coating operation is the most serious accidents caused by powder spray combustion and explosion,glue gun the occurrence of 3 reasons: First, as a combustible powder coating material, with the possibility of combustion and explosion; the second is the normal spraying, if the spray electrode by and the workpiece (or other objects) in the space properly, the discharge ignition phenomenon may occur, if the current source control failure, the energy of the ignition of suspended powder blasting may exceed the minimum ignition energy; third spray tank the powder and air mixture, if the recycling air flow is not enough to reduce the concentration of powder and air mixture to allow the concentration of the LEL is easy to achieve, when the powder electrostatic ignition energy than the minimum ignition energy, it may cause explosion.
2 electrical fault.
Electrostatic powder coating more electrical fault accident, in which spray room, spray devices, electric oven, bake, such as equipment failure rates are high. Electrostatic spraying high pressure caused by electric shock devices, often caused by electrical short-circuit fault; electric furnace heating elements in the aging, static electricity, electrical grounding confusion, mistake or grounded electric appliances will cause bad injuries; mobile device power cable insulation wear leakage caused by accidents.
3 machinery accident.
Electrostatic powder coating mechanical accident hazards can not be ignored, especially in the wet pre-treatment process degreasing, rust removal, phosphate, washing, etc., spray equipment or tank leaching equipment, dry pre-treatment process in the blast, jet Preheat oven sand equipment, spray tanks, curing oven, the cooling device so easily lead to accidents. Workpiece or hanging chain, hook parts, parts are drop may cause serious damage to equipment, or even blasting accident.
4 spraying.
Analyzed from the process, electrostatic powder coating contains a number of aspects of the accident factors, such as the process is reasonable, between the parameters of the process, equipment, convergence is appropriate; power system control device designed or chain; safety warning signs to set reasonable or not, how the effectiveness of preventive measures blasting; security alarm system, fire system equipment is appropriate, in particular information processing mode sensing speed and position. From the point of view of operational management, the main labor protection measures should be considered the perfect degree; safe operating procedures, standards, implementation of standards; operators including safety education, including pre-job technical training; check the effectiveness of security technologies; equipment maintenance, maintenance cycle and quality; safety emergency equipment, including repair equipment, and other items ready to state a number of factors.
Accident prevention measures.
1, the overall layout of painting workshop.
Painting should be arranged in workplace perennial plant of the windward side of the minimum frequency of wind direction, and before the plant area, crowded place, plant cleanliness requirements between high enough to stay a safe distance, in principle, should be set by an independent plant, also to be according to GB50016-2006 "building design for fire protection," the relevant provisions of the building fire channel, to ensure the smooth flow of import and export more than 2. Large coating plant operator position within the security gate and entrance of emergency evacuation from not more than 25m. When the painting and make use of enclosed spray painting process closed to maintain negative pressure room, while setting the concentration of combustible gas alarm system or automatic explosion suppression systems (including qualified vent device), and the painting section in fire district area accounted for less than a painting workshop 20%, the plant can produce a fire hazard classification of the D, E production plant to determine fire safety requirements.