It refers to the economic evaluation of the equipment purchase stage. First of all, several feasible equipment purchase program should be formed, through the comparative analysis of the program, select the optimal program, so as to achieve the purchase of the best economic equipment.
Commonly used equipment evaluation methods are two:
1. Payback period method. That is, on the one hand, to calculate the investment costs of different equipment; on the other hand, due to the use of new equipment to improve labor productivity, energy consumption, product quality and so on to ensure the formation of the amount of savings, according to the investment costs and savings in the calculation of the payback period. Calculation formula for:
Equipment payback period (years) = equipment investment (yuan) / the use of new equipment after the annual savings (yuan / year)
Other conditions are the same, in accordance with the shortest payback period to select equipment.
2. Cost conversion method. First of all, to understand the different equipment in the purchase of the initial investment fee, while estimating the different equipment in operation after the use of the annual maintenance fee must be spent. Because of the different conversion methods, can be divided into:
(1), the present value method. Through the present value of the coefficient of the annual maintenance costs converted to the equivalent of the initial investment costs, and the initial investment in the acquisition of the cost is summarized into the present value, and then carry out a comparison of the present value, select the optimal equipment.
(2), the annual cost method. The initial investment cost of the purchase of equipment, based on the compound interest rate converted to the equivalent of the annual cost of expenditure. And then with the annual maintenance fee to summarize the adult cost, the annual cost of different equipment for comparison, analysis, selection of the optimal equipment.
Establishment of the coating production line: first of all, to determine the production program, complete the process design, program planning, and then the design of non-standard equipment, manufacturing and installation. Therefore, process design, program planning is the basis for the establishment of production lines, correct and reasonable route to the production operation and product quality will have a decisive impact. The content of process design mainly includes: workpiece surface coating quality requirements of pretreatment methods, spraying methods, process flow, coating properties, spraying environment, time, etc..
The purpose of coating: through the coating construction, the paint on the surface of the coated object to form a solid continuous coating and play its role in decoration, protection and special functions
Coating elements: the key to the coating project is: coating process and equipment, coating materials, operating environment, and coating management.
The quality of the coated material is the basic condition for obtaining high quality coating. Painting process, equipment, painting environment is to give full play to the performance of the coating materials, to obtain high-quality coating, reduce production costs and improve economic efficiency of the necessary conditions. Coating management is to ensure that the implementation of the developed technology to ensure that the coating quality stability, to achieve the purpose of coating and the best economic benefits of the important conditions.
Painting the main equipment: coating the main equipment is divided into coating the surface pretreatment equipment, paint equipment, film drying and curing equipment, mechanized conveying equipment, dust-free constant temperature and humidity air supply equipment and other ancillary equipment.
Painting surface pretreatment equipment, pretreatment purpose: to remove the coated parts with foreign matter, such as oxide, rust, grease, etc., to provide a good substrate suitable for painting requirements, such as phosphating, oxidation, passivation, in order to ensure that the coating has a good anti-corrosion properties and decorative properties. Pretreatment equipment is mainly divided into physical type, chemical type.
Physical type:
①, remove impurities attached to the surface of the steel plate, remove grease and other dirt with diluent.
②, if there are sulfates or corrosive salts, should be washed with water, blow dry with compressed air.
③, in the steel plate pretreatment line, with shot blasting or sand blasting rust removal method to remove the oxide skin, rust and her impurities, and then use a vacuum cleaner or purified compressed air to remove the steel surface.
Chemical type:
Impregnated type, spraying type, combined type of dipping and spraying, combined type of spraying-dipping-spraying.
Mainly consists of tank body, tank liquid heating system, ventilation system, tank liquid mixing system, phosphating deslagging system, oil and water separation system. Among them, phosphate deslagging and oil-water separation device is the key system, phosphate deslagging method, spinning liquid separation method, inclined plate sedimentation method, bag filtration method, plate and frame filter press and other common methods.
Oil-water separation is mainly: adsorption, ultrafiltration, thermal oil separation and centrifugal method.