The determination of the process plan of the production line shall fully consider the practicability and progressiveness of the technology, and fully meet the requirements of product quality and production program; The selected technology is mature and reliable, without any test

The design and selection of process equipment of the production line adopt advanced technologies at home and abroad to ensure the realization of the process and various technical parameters; Coating technology and equipment with high efficiency, low energy consumption and low pollution shall be adopted as far as possible

All equipment of the production line shall be practical, reliable and safe. Purchased equipment and components shall be used. Imported products shall be used for key equipment and domestic high-quality brand products shall be used for general equipment

For self-made equipment on the production line, common parts and standard parts shall be used as much as possible in the structural design to improve the product standardization and facilitate maintenance, fully consider the improvement of the production and working environment and labor hygiene conditions, and implement the relevant national and industrial standards and regulations

The overall layout of the production line shall fully consider the rationality of the process flow of the whole production line, and the equipment layout shall be coordinated, orderly, beautiful and convenient for operation and maintenance

The environmental protection, safety and three wastes treatment involved shall be designed according to relevant standards and specifications and put into operation at the same time with the equipment

It is made of 50mm color steel sandwich plate to reduce the sand blasting noise to below 500Hz, which greatly improves the noise environment and has good corrosion resistance and weather resistance: 2mm thick steel plate is laid below 2m around the room, and 4mm thick wear-resistant rubber plate is installed around the room to effectively protect the sand blasting room; The floor inside the room is made of steel grating, 40mm × It is made of 4mm Flat steel, with perforated plate laid on it, 3mm thick, modular structure, convenient for daily maintenance; A trench (about 1200mm deep) is dug between the two guide rails at the bottom of the shot blasting chamber to facilitate the operators to perform shot blasting on the bottom of the workpiece.

It is composed of sand blasting host, sand valve, stop valve, rotary feeding valve, high-speed spray gun, etc; Jiutong jt-11-900y high-efficiency and large-capacity sand blasting machine is adopted as the sand blasting host. It can be equipped with two sand control valves and two high-speed spray guns at the same time. The sand loading capacity is large, and one tank can contain about 5 tons of steel sand; The sandblasting tank is designed and manufactured according to ASME standards and meets the requirements of relevant national standards; The sand valve has the advantages of convenient adjustment, safety and reliability, and long service life (more than 3000 hours); The high-speed sandblasting gun is made of boron carbide and has a long service life of 800-1000 hours

Compared with the traditional sand absorption floor, it has stronger sand absorption ability, greatly reduces the sand blocking fault caused by the presence of welding slag, welding rod head and large particles, and has low maintenance cost; There is no need to dig deep trenches to save capital construction cost; The air inlets for sand material recovery and dust recovery are all arranged under the honeycomb sand absorption floor. The air flow and dust are always from top to bottom to ensure that the dust concentration in the space above 0.5m in the sandblasting room is very low, the visibility is very high, and the working environment is good.

Two stage separation is adopted. The first stage is a unique inertial separator, and the second stage is a screen separator, which can effectively separate the foreign matters, abrasives and dust in the recovery system. The separated complete sand material is returned to the main machine of the sand blasting machine for recycling. The dust and crushed sand are sent to the dust remover for filtering and stored in the dust remover for regular cleaning.

The filter cartridge type dust collector is adopted. The filter cartridge filter material is a new type of material produced in Japan. The filter material is 100% polyester fiber with a thickness of 0.75mm; Heat resistant maximum temperature: 80 ℃; Air permeability: 220m3 / m2 / h; Weight: 240g / m2; Filtration precision: 5um-10um; Filtration resistance: ≤ 45pa; Filtration efficiency: ≥ 99.99%.

The electric control system adopts S7-200 programmable controller produced by Siemens for centralized control. S7-200 series programmable controller is the latest product launched by Siemens in recent years. It has the characteristics of fast processing speed, stable and reliable performance, and more convenient communication and networking. Contactors and thermal relays are all products of Schneider, Delixi and other companies.

The chamber body adopts: δ75mm thick rock wool sandwich insulation layer (rock wool density is 120kg/M³）， The outer wall is 0.5mm color steel plate, and the inner wall is 0.5mm 304 stainless steel, so that the temperature of the outer wall plate is not higher than 5°C of the room temperature. The thickness of the inner and outer wall plates of the chamber is δ 0.6mm galvanized steel plate, filled with rock wool in the middle, the heat transfer coefficient shall not be greater than 0.38kcal/㎡. H.℃, and the average sound insulation shall not be less than 21.5r (DB). The column of the chamber is made of profile steel, and its strength, stability, thermal insulation, sealing, impact resistance and seismic resistance meet the requirements of national or industrial standards.

According to the control wind speed specified in gb14444-2006 safety regulations for painting operation and technical regulations for safety of paint booth, and according to the requirements of industrial painting, the paint booth is designed with micro negative pressure, that is, the exhaust air volume is slightly greater than 3-5% of the air supply volume, which can prevent external dust from entering the operation area. The unit is equipped with air inlet filter section, air valve, filter section, fan section and heating section.

The equipment is provided with sectional air supply and exhaust. The main exhaust fan is started only when painting. B4-72 explosion-proof centrifugal fan, fan and motor are explosion-proof; Considering the initial investment and operation cost, only one set of exhaust system is designed for the equipment, and the exhaust and waste gas treatment functions of each section are realized by controlling the switching of valves; During drying, four sets of exhaust fans with small air volume (air volume is about 5% of the air supply system) are additionally configured for indoor ventilation and discharge of high concentration circulating gas during drying to avoid waste gas overflow.

The spray booth is equipped with 2 sets of spraying systems. The spraying system is selected from the products of Graco company of the United States. The products have stable performance, high reliability and long service life. It is especially suitable for the automatic line of continuous operation, and effectively solves the production line shutdown problem caused by frequent failures; Robots can also be selected to replace the spray painting workers for spray painting. It can avoid the heavy labor of operators in the harsh working environment. At the same time, it can ensure stable workpiece surface quality and high production efficiency, and realize automatic spray painting!

In order to ensure the cleanliness of fresh air, the equipment adopts primary filtration and precision filtration on the top of the room (synthetic fiber filter material 3a-600g (F5) sub high efficiency filter top cotton is selected). After secondary filtration, the cleanliness of air supply can reach 10 μ 100% filter off dust particles above 3-10 μ M μ M) the number of dust is not more than 300 / cm ³。 The filter material is set at the bottom of the static chamber and supported by the top cotton support net. The top cotton support net is of high-quality C-shaped steel structure. After special rust prevention treatment, it has good rigidity, no corrosion and easy to replace the top cotton.

Left, middle and right exhaust ducts are set on the floor of the paint booth. The paint mist filter device is installed in the air duct. During spraying, the spray mist can pass through the flat filter cotton with the air flow, and a large amount of paint mist is absorbed, with an adsorption efficiency of more than 98%. The paint mist filter device is composed of PA-50 filter fiber support net and filter fiber cotton. When replacing, remove the upper floor grid, take out the tiled filter cotton and support net, then replace the filter cotton, and then lay a new filter cotton. The saturated filter bottom cotton is sent to the incinerator for incineration to prevent environmental pollution.

In the scheme, the user's investment and the local environmental protection policies of the project are considered. The whole equipment adopts activated carbon adsorption bed filtration, and the catalytic combustion equipment interface is reserved to provide additional facilities for the future environmental protection requirements upgrading. The organic waste gas can be adsorbed by using the adsorption characteristics of activated carbon micropores. The waste gas with low concentration, low temperature and hydrocarbon can be treated. The solvent can be recovered and reused. The purification efficiency of organic waste gas is as high as 90-95%. The adsorption of organic solvent before regeneration can reach 25% of the total weight of activated carbon. The iodine value of the self-contained activated carbon of the equipment is ≥ 800, and the carbon content is ≥ 15m ³， 4 activated carbon adsorption beds, each volume ≥ 4.3m ³， The drawer structure is adopted in the structure, so that it can be replaced quickly

The paint booth adopts a control system composed of LCD touch screen and Siemens PLC. Through the touch screen, the start and stop of the whole paint booth can be controlled, and the parameters such as operation time and temperature can be set and controlled, and the equipment of each unit in the paint booth can be controlled. It is possible to display the working state of each main device. The control system is safe and reliable, easy to operate, and has various protection and alarm functions. It has multi-function automatic conversion function, and can realize automatic conversion function operation such as normal temperature painting, temperature rise painting, drying and dehumidification on the control console. When the equipment status is changed, all relevant automatic valves can be automatically changed.

The thickness of the outer wall plate of the chamber is δ 0.476mm corrugated color steel plate, and the thickness of the wall plate in the chamber is δ 0.6mm galvanized steel plate, filled with rock wool δ 100mm thick (rock wool density is 120kg / m3) insulation board, and the material of the chamber body is δ 1.5mm cold plate, so that the temperature of the outer wall plate is not higher than 5 ℃ of the room temperature, with strong sealing and thermal insulation.

The shell is welded by profile steel and thin steel plate. Both ends are connected with the air duct by flanges. Both sides are insulated and insulated by asbestos plates. Carbon steel electric heating tubes are selected as electric heating elements, 3KW / piece, with a total quantity of 160 pieces.

3001gg high temperature resistant coarse effect flat filter is selected. It is made of alkali free glass fiber filament. The fiber layer is thin to dense from the windward side to the leeward side, effectively blocking dust. It has the characteristics of large air volume, small resistance, flame retardant, chemical corrosion resistance and excellent radiation resistance

In order to ensure that the concentration of organic solvent vapor in the drying room is within a safe range, the drying room must exclude some gas and introduce corresponding volume of fresh air. According to the calculation, the exhaust gas emission is 3000 m3 / h. This part of the exhaust gas is introduced into the heater furnace by the traction fan for incineration and then discharged.