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Electrostatic powder coating accident prevention measures

electrostatic spraying method is a coating method that makes the atomized paint particles negatively charged in the DC high-voltage electric field according to the physical phenomenon of electrophoresis, and under the action of the electrostatic field, flows directionally to the positively charged workpiece surface, and forms a uniform and firmly attached film after neutralization and deposition

compared with ordinary painting, painting or mechanical spraying, electrostatic spraying can greatly improve the working environment of workers, make the paint mist no longer fly into the air, and ensure the health of workers. However, due to various reasons such as operators' failure to operate in accordance with national standards and specifications in electrostatic powder spraying operations, serious accidents such as fire and explosion occurred frequently in electrostatic spraying operations, and 5g testing network was under construction in China. Therefore, the prevention of electrostatic powder spraying accidents must attract the attention of relevant personnel

causes of accidents in electrostatic powder spraying operation

1 combustible material powder

the most serious accident in electrostatic powder spraying operation is the combustion and explosion caused by powder spraying. There are three reasons: first, the powder coating is combustible material, which has the possibility of combustion and explosion; Second, during normal spraying, if the distance between the sprayer electrode and the workpiece (or other objects) is improper, discharge ignition may occur. If the constant current source control fails, the ignition energy may exceed the minimum ignition energy of suspended powder explosion; Third, the mixing of powder and air in the powder spraying cabin. If the recovered air volume is not enough to reduce the mixing concentration of powder and air to the allowable concentration, it is easy to reach the lower limit of explosion concentration. When the electrostatic ignition energy exceeds the minimum ignition energy of powder, explosion accidents may be caused

2 the prospect of electrical is very decadent.

there are many electrical failure accidents in electrostatic powder spraying, among which the failure rate of spray chamber, spray gun device, electric furnace, drying channel and other equipment is high. Electric shock caused by electrostatic high voltage of spraying device is often caused by short circuit fault of electrical circuit; Aging electric heating elements in electric heating furnaces, static electricity, lead screw drive and rack drive of electrical appliances, disordered grounding, wrong grounding or poor grounding will cause electrified appliances to injure people; The insulation layer of power cable of mobile equipment is worn, and electric leakage leads to accidents

3 mechanical accidents

the harm of mechanical accidents in electrostatic powder spraying can not be ignored, especially the degreasing, derusting, phosphating, water washing, etc. in the wet pretreatment process, spraying equipment or tank soaking equipment, shot blasting, sand blasting equipment, preheating furnace, powder spraying chamber, curing furnace, cooling device, etc. in the dry pretreatment process are easy to cause accidents. Workpiece or catenary, hook parts, and falling parts may cause serious damage to the equipment, or even combustion and explosion accidents

4 spraying process

from the process analysis, the accident factors of electrostatic powder spraying include many aspects that it is not easy to deviate from the linear elastic mechanics relationship before the crack expands, such as the rationality of the process, whether the parameters between the processes, equipment connection, etc. are appropriate; Whether the interlocking design of the power system control device is reasonable; Whether the setting of safety warning signs is reasonable or not, and how effective the combustion and explosion prevention measures are; Whether the safety alarm system and fire protection system equipment are appropriate, especially the information sensing speed and processing mode. From the perspective of operation and management, we should mainly consider the perfection of labor protection measures; Implementation level of safety operation procedures and standards; Technical training including safety education for operators before work; Effectiveness of safety technical inspection; Cycle and quality of equipment maintenance and repair; Emergency equipment for safety accidents, including emergency repair equipment, readiness of items and many other factors

accident prevention countermeasures

1 general layout of the coating workshop

the coating workplace should be arranged on the upwind side of the wind direction with the minimum frequency throughout the year in the plant area, leaving enough safety distance from the front area of the plant, crowded places and plants with high cleanliness requirements. In principle, it should be set up as an independent plant, and at the same time, it is necessary to set up fire fighting passages according to the relevant provisions of GB code for fire protection design of buildings to ensure more than two unobstructed entrances and exits. The emergency evacuation distance between the painting operation station in the super large plant and the entrance and exit safety door is generally not more than 25m. When the painting operation adopts the closed painting process and keeps the negative pressure in the closed painting space, and the combustible gas concentration alarm system or automatic explosion suppression system (including qualified explosion relief device) is set at the same time, and the fire compartment of the painting section accounts for less than 20% of the area of the painting workshop, the fire prevention requirements of the workshop can be determined according to the class D and class E production workshops in the fire hazard classification of production

2 operator safety management

operators must be familiar with equipment systems, including emergency relief facilities, fire-fighting facilities and alarm devices, and be proficient in operation. Operators shall receive training before taking up their posts, understand the safety performance of the equipment, and consciously abide by the safe operation procedures. Operators must be familiar with and abide by personal labor protection knowledge, and are required to take dust collection measures when cleaning dust. Check and maintain the equipment regularly to ensure that the equipment operates in good condition. Full time safety officers must patrol the production site and conduct regular inspection

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