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First of all, the design information you provided is not comprehensive, such as the lack of pretreatment information (process flow? Process parameters? What is the size of the water tank? Wait a minute. ), phosphating film drying method (drying? Drying temperature? Fuck? Blow dry? Wait a minute. ), coating type (powder coating? Electrophoretic coating? Spray paint? Wait a minute. ), output (the distance between every two distribution boxes on the transmission chain? ), coating quality requirements (impact test? Adhesion? Bending test? Cupping test? Neutral salt spray resistance test? Wet heat test? Wait).

Secondly, when you say "drying tunnel", you should mean "curing room". The width and height of curing chamber are related to the shape of workpiece and the way of fixture, and the length of curing chamber is related to the output and the way of fixture. For powder coatings, regardless of the output, the curing room must ensure that the curing temperature (constant temperature section) is between 180-220 degrees and the curing time is between 15-30 minutes (the curing temperature and time required by different powder coatings are different).

Thirdly, according to the information you provided, "The appearance of one drying tunnel is 1.2m * 1.8m * 25M, and the other is 2M*4M*25m", the total length of the curing chamber is 25m, from which you can calculate your approximate output (assuming the distance between every two workpieces on the conveyor chain is 1m). If the daily production is effective for 8 hours, the daily output is 200. It should be noted that the above accounting is an ideal state. In practical work, the output will be reduced for one reason or another, so the above output should be multiplied by 80%, that is, 160.

Fourthly, due to the different tooling, the above calculation is based on the width of 250mm, that is, the internal width of the curing room should be 250 mm+500x2 =1.25m. If there is thermal insulation, the external width should be about 2m. The total height of the workpiece is 1m, that is, the internal height of the curing chamber is 1000mm+500x2 = 2m, and the insulation layer should be about 3m. So the parameters given by the two companies are not accurate.

To sum up, the curing room should be 2M*3M*25M.