Design Principles:
Utilize reliable production technologies and equipment, along with modern management, to replace traditional, outdated painting processes, equipment, and management. Meet requirements for painting technology, paint quality, environment, hygiene, and production standards; equipment is reliable, advanced, aesthetically pleasing, cost-effective in operation, easy to use, and convenient.
Painting workshop layout principles:
The manual and non-manual operation areas are relatively separated.
2. The clean and non-clean areas are separated relative to each other.
Minimize the volume of shipment.
4. Minimize noise pollution.
Process Design:
Based on the absorption and digestion of advanced domestic and international coating technologies and mature experiences, ensure that this process design is practical, reliable, and advanced.
All equipment design and manufacturing are strictly in accordance with national standards for environmental protection, hygiene, and safety. Noise reduction measures are taken for each piece of equipment, ensuring that the noise level in the workshop is below 85 decibels.
The equipment meets the product's usage requirements, operates reliably, is easy to operate, and convenient to maintain.
The selected accessories, materials, and electrical components are all domestic renowned products, ensuring reliable quality and performance, as well as the service life of the equipment.
Carefully consider the interconnection between systems and implement protective measures against equipment failures to prevent accidents.
(6) A dry paint booth with top air supply and bottom exhaust ventilation.
Equipment specifications and structural design
1. Operating Principle:
During painting, the external air is filtered through the primary filter mesh at the intake vent and then delivered to the roof by the fan (the heating system is activated in winter). This allows the gas to enter the static pressure room, evenly filling the paint room with the help of filter cotton, creating a wind curtain around the workpiece. At this point, the empty room air speed in the paint room exceeds 0.23 m/s, ensuring that paint mist from the painting process does not linger in the operator's breathing zone but quickly descends. Subsequently, the air flow is directed through the exhaust fan, passing through the exhaust gas treatment system to the exhaust duct, and finally released through the environmental protection box, in compliance with the GB16297-1996 standard.
2. Main structure and components of the equipment
Structure Composition: Comprises the room body, lighting system, air filtration system, air distribution system, heating system, exhaust system, paint mist and waste gas treatment system, electrical control system, and safety system, among other components.
2.1. The chamber is mainly composed of the frame, wall panels, workpiece entrance and exit doors, and safety doors. The strength, stability, thermal insulation, sealing, impact resistance, and seismic resistance of the chamber meet the requirements of national or relevant industry standards.
⑴ Frame
The cabinet frame is made from square steel tubes and galvanized steel plates that are bent and welded together.
⑵ Wall Panels
The room panels are made of composite thermal insulation boards, with both inner and outer panels being color steel plates, filled with 58mm thick polyurethane insulation material. The total thickness is 75mm. All panels are assembled for easy installation and disassembly. The color is white.
Lighting System: Explosion-proof lighting units are installed on the top and side sections of the room. The top units are mounted at a 45-degree angle, while the side units are installed within the wall panels. The tubes are equipped with explosion-proof Philips high-efficiency sources, ensuring safety, energy efficiency, and ease of maintenance. The ballasts are designed specifically for spray rooms by our company, guaranteeing an illuminance of approximately 700Lux.
Each side of the waist features two layers of lighting arrangement.
2.3 Air Filtration System
Air filtration is of two stages, including preliminary filtration (inlet air filtration) and high-efficiency filtration (top filtration). The preliminary filtration is set at the inlet, utilizing a mesh structure to effectively filter particles larger than 15μm.
The primary technical specifications of the initial efficiency filter cotton are:
Initial Resistance 24 Pa
Final resistance 250 Pa
Average Capture Rate (Calculation Method) 86%
Dust Holding Capacity: 620g/㎡
Thickness: 20mm
High-efficiency filtration material is selected, with 600G precision-grade filter cotton flatly laid on the galvanized mesh at the bottom of the static pressure chamber, securely fastened by a circular steel frame. This ensures a secondary air filtration and more even airflow distribution into the operation area, thereby guaranteeing consistent air volume and purity. The filter cotton has a multi-layer structure, with an oil-resistant intermediate layer that provides strong adhesion, ensuring air purity with dust content ≯1.5mg/m3, dust particle count ≯200 per cm3, and large dust particles ≯5µm. Differential pressure gauges are set on the top and bottom of the filter cotton; an alarm is triggered to prompt replacement when the filter cotton becomes severely clogged, causing a significant reduction in airflow speed and an increase in differential pressure, to prevent mismatched supply and exhaust airflows that could lead to excessive indoor-outdoor pressure differences affecting the painting process. Its main technical specifications are:
Model: 600
Initial Resistance 19 Pa
Final resistance: 230Pa
Average Capture Rate: 98%
Dust Holding Capacity 419 g/m²
Thickness: 25mm
Flame Retardancy: Meets F5 rating standard
2.4 Air Supply System: Composed mainly of an air supply fan, fan base, and steel frame. The fan bases are filled with sound-absorbing material to reduce noise and vibration.
Based on the workpiece features, the airspeed in the paint room should be above 0.23 m/s, as calculated.
Q1=3600FV=3600×（14×10）×0.23=115920m3/h
Considering wind resistance and interference coefficients, a total air volume of 120,000 m³/h is selected, with a total of 4 air supply systems, consisting of 8 YDW type centrifugal fans.
Fan parameters are as follows:
Model: YDW
Airflow: 15,000 m³/h
RPM: 950 r/min
Pressure: 801 Pa
Power: 5.5 kW
Quantity: 8 units
2.5, Exhaust System: Comprised mainly of exhaust fans, ducts, and profiles, etc. During painting, to discharge the filtered air at a high altitude, two exhaust systems are installed, each with a flow rate of 35,201 m³/h, to maintain a slightly positive pressure state within the chamber during painting, thereby ensuring the quality of the coating. Each system is equipped with one centrifugal fan, model 4-82.
2.6 Paint Mist and Waste Gas Treatment System: Utilizes dry treatment, with the treated gases released into the air at high altitudes, in compliance with the national standard GB16297-1996.
Airflow exhaust ducts
