Several commonly used equipment evaluation methods

There are two commonly used equipment evaluation methods: 1, payback 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, save energy consumption, ensure product quality and the formation of savings, according to the investment costs and savings calculated payback period. Calculation formula: equipment payback period (years) = equipment investment ($) / the use of new equipment after the annual savings ($ / year) in other conditions are the same, in accordance with the shortest payback period to select equipment. 2, the cost of conversion method. First of all, understand the different equipment in the purchase of the initial payment of an investment fee, while estimating the different equipment in operation after the use of the annual maintenance fee must be spent. Due to the different conversion methods can be divided into: (1), the present value method. Through the present value 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 of aggregated into the present value, and then carry out a comparison of the present value, select the optimal equipment. (2), the annual cost method. The acquisition of equipment once the initial investment costs, 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 painting 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 the production line, the correct and reasonable route will have a decisive impact on the production operation and product quality. The contents of process design mainly include: workpiece surface coating quality requirements of pre-treatment methods, spraying methods, process flow, coating properties, spraying environment, time, etc.. The purpose of painting: through painting construction, make the paint on the surface of the coated object to form a solid continuous coating and play its role of decoration, protection and special functions Painting elements: the key of painting project is: painting process and equipment, painting materials, operating environment, and painting management. The quality of the coated material is the basic condition for obtaining high-quality coating. Coating process, equipment, coating environment is to give full play to the performance of coating materials, to obtain high-quality coating, reduce production costs and improve economic efficiency of the necessary conditions. Coating management is to ensure the implementation of the formulated technology, to ensure the stability of the coating quality, to achieve the purpose of coating and the best economic benefits of the important conditions. Coating main equipment: coating main equipment is divided into pre-painting 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 foreign matter carried by the coated parts, such as oxide skin, rust spots, 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 anticorrosion properties and decorative properties. Pretreatment equipment is mainly divided into physical type and chemical type. Physical type: ①, remove impurities attached to the surface of the steel plate, remove grease and other dirt with diluent. ②, such as sulfate or corrosive salts, should be washed with water, blow dry with compressed air. ③, in the steel plate pretreatment line, remove the oxidized skin, rust and her impurities by shot blasting or sand blasting, and then use vacuum cleaner or purified compressed air to remove the steel surface. Chemical type: impregnation type, spraying type, dip-spray combination type, spray-dip-spray combination type. It is mainly composed of tank body, tank liquid heating system, ventilation system, tank liquid mixing system, phosphating deslagging system, oil-water separation system and so on. Among them, phosphate deslagging and oil-water separation device is the key system, phosphate deslagging method, spin-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.