FFP2 mask is one of the European mask standard EN149:2001. Its function is to absorb harmful aerosols, including dust, smoke, mist, poisonous gas and poisonous vapor, etc. through the filter material, blocking it from being inhaled by people.
The filter material of FFP2 mask is mainly divided into four layers, namely two layers of non-woven fabric + one layer of meltblown fabric + one layer of needle punched cotton.
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Due to the cooperation of the cotton mill in the process of the front and the back, the relationship between speed and output and quality has been carefully calculated. In the case of constant supply, the speed requirements are generally not changed, and only one or two speeds are selected. In this case, it is possible to change the stepless speed regulation directly to the fixed speed operation, that is, 1100 m / min, 1000 m / min, 900 m / min (the drum winding speed). So we designed a fixed speed system by ourselves. Without destroying the original, we designed the third speed according to the speed requirement. The original stepless speed control driven disc was changed to the intermediate medium wheel, and the lower drive shaft was changed to replaceable. The V-belt disc solves the third speed. A set of speed change discs only costs RMB 450 to 500, while a set of stepless speed control system costs 21,000 yuan. Compared with less investment, the speed is stable and it is conducive to electronic yarn clearing. Renovation requirements (1) All processed parts need to be calibrated and then put on the train. (2) Processing size, it is required to reach the standard pattern conveyor belt of the figure. (3) It is best to use imported or domestic high-quality V-belt to avoid the speed instability, the belt is not durable, and it is unnecessary to stop. (4) All castings require no blisters, quenched and tempered, and the exposed surface is sprayed with green paint to prevent corrosion.
Effect analysis: vehicle speed (m/min) 11001000900 drive wheel diameter (mm) 240218197 or more transformation, after more than a year of practice, the effect is good. Since the upper and lower wheels are lighter than the original and save electricity, all 10 vehicles have been rebuilt. This alone will save the company more than 200,000 yuan, but the investment is only a few thousand yuan, and has achieved certain economic benefits. Not only the diameter is increased, but also the weight of the cloth roll is increased, and the contact stress between the gears in the reduction gear box that drives the take-up cloth roll is increased, resulting in a shortened gear life. In response to this situation, localization studies were carried out on the gears in the gearbox. If you want to import gear parts, you need to enter a complete set of gearboxes, but the other gears in the gearbox are generally not bad. Only a helical gear of Z-9 is easy to break, and the imported gears are expensive and have a long cycle. According to our domestic materials and processing conditions, we must analyze the parameters, materials, processing accuracy, and heat treatment of the gear itself. In order to improve the strength of the gear teeth, increase the meshing angle of the transmission and reduce the fatigue pitting of the tooth surface of the gear. If the positive displacement coefficient is too large, the overlap coefficient will be reduced accordingly, which will affect the stability of the transmission and the thickness of the tooth tip will change. Thin, affecting the strength of the crest, so the appropriate displacement coefficient should be calculated according to the fit of the pair of gears.
FFP1: The minimum filtering effect is 80%
FFP2: The minimum filtering effect is 94%
FFP3: The minimum filtering effect is 97%
