In accordance with the paint mist processing way and its own structural features, painting can be divided into dry type and wet type two kinds, wet is divided into water and water cycle in two forms. The paint to dry according to the energy used in the heating can be divided into steam heating, electric heating tube heating, oil heating, gas, natural gas, liquefied gas and gas heating, including fuel heating is the common use of the operation cost is more economic choices. General large-scale production assembly shop has its own characteristics, the overall high quality demand of spray paint, small batch production, paint drying temperature low. So the spraying mostly adopts dry fuel heating equipment incorporated in the paint, paint, paint spraying and drying in the same location realized two process, satisfy the need of the production process, and saves space.
Equipment composition
Spray paint need to meet the coating operations on the environment, such as temperature, illumination, cleanliness requirements; To ensure the safety and health for the operators and reach the emissions standards. It generally by the chamber body, air supply system, ventilation system, heating system, filter and capture mist system, lighting, electric control system and supporting system, etc, adopting air distribution, from the top to the bottom of the convulsions of emissions or heating temperature.
1) Chambers: the role is to put the paint fog limited within a certain range, with a ventilation device makes mist along the air moving in the direction of flow to the filtration unit for processing. It consists of room wall, roof and floor grille. Room wall is made of color steel plate profiling general casting polyurethane foam foam insulation board, with a glass window. Roof on room wall above, is equipped with all the wind filter unit. Ground grid above the ground return air duct and grille gap of about 30 ~ 50 mm, height of 30 ~ 50 mm, with 3 ~ 4 mm thick flat steel welding assembly. Now there is a kind of can with expansion chamber before mobile telescopic mobile spray paint room, brought large spraying operation more convenient.
2) for the wind system: used to spray paint room to provide clean, comfortable temperature of air, to meet the needs of the production technology. Spray paint spray paint requirement when the room temperature in the 20 ~ 25 ℃ (summer) at room temperature, wind speed 0.3 m/s, or positive pressure of 4 ~ 8 pa. Paint spray paint requirement when the room temperature is in (70 + 3) ℃, 2 hours heat preservation, ventilation cooling requirements remain (20 + 3) ℃, insulation 5 hours. General fan selection B4-72 - type l2 NO. 8 c, air volume of 17000 m3 / h, motor power 7.5 kW, the fan also as the hot air circulation use of the lacquer that bake, fan configuration number depending on the actual technical requirements.
3) exhaust system: use explosion-proof type centrifugal fan, motor should be explosion proof, you need to set up regulating valve, exhaust air volume can be adjusted, in order to guarantee the micro positive pressure conditions in spray-paint room, to prevent the workshop impurity gas or dust into the spray paint room. Axial flow fan is generally selected or B4-72-12 NO. 8 c, air volume of 16000 m3 / h, motor power 7.5 kW, fan configuration number depending on the actual technical requirements.
Contains 4) heating system: configuration heating furnace, heating furnace burner, heat exchanger, and oil supply pipeline system of three parts. Import burner burner with high combustion efficiency, easy use and maintenance of security, the program controller for automatic control of the combustion process, air door controlled by servo machine automatic adjustment, high voltage electronic ignition using digital monitor fire, has the characteristics of safe and reliable. Heat exchanger is its core component, generally USES a multi-pass tube shell type floating head structure, smoke and wind road is the cycle of two independent systems, heat exchange component adopts full stainless steel manufacturing, in order to guarantee the quality of wind circulation. Multilayer insulation heat preservation, heat preservation effect is good, exhaust smoke temperature is low, small heat loss, exchange, high efficiency; Slide rail junction ?
5) filtering, and capture mist system: blower inlet and spray paint the upper air inlet shall set up effective non-woven filter bag, used to larger dust filter out particles in the air (3 microns collection coefficient, the efficiency > 95%). The ground return air duct filter glass filter material should be adopted.
6) lighting: lighting is located in the inner chamber wall spray paint room location, intensity of illumination should be l000Lx or higher.
7) electrical control system: should adjust and display temperature, time, burning machine and fan interlock control. Exhaust fan painting in a state of work, don't work under the state of the lacquer that bake; Blower, burning machine can be controlled separately, and the burning machine, fan operation should has light display; Spray paint room temperature more than 80 ~ C should report to the police; Is required to fulfill the requirements of heat preservation of the lacquer that bake a buzzer notification operation personnel; Panel should have lighting and lift the car control switch. And set up a control cabinet, the use of automatic temperature control, automatic delay, configuration of digital display temperature control instrumentation, low voltage circuit breaker and ac contactor.
8) supporting system: including mobile car sliding door, etc. Mobile car is to make staff to easily reach to spray paint spraying the different parts, and set up on both sides of the spray paint room length direction. Sliding door is the width of the side of the spray paint for being in and out of the sprayed articles. A length direction side should be equipped with a side door, when the spray paint room can automatically open when the positive pressure is greater than the l0Pa, assure indoor air pressure in the normal range, a side door and heating chamber should be in the same side.
