(1) Mechanical vibration bag type dust collector is a bag type dust collector that uses a mechanical device (including manual, electromagnetic vibration, pneumatic) to vibrate and clean the filter bag. The characteristics of such a dust collector are that the kinetic energy applied to the dust layer is less and more frequent. It should be made of chemical fiber satin or twill fabric, thickness 0.3-0.7mm, mass per unit area 300-350g/m, filtration speed 0.6-1.0m/min; for small units can be increased to 1.0-1.5m/min.
(2) The compartment back-flush bag type dust collector adopts a compartment structure, and uses a valve to switch by chamber to form a reverse type airflow back-blowing, so that the filter bag is shrunk or bulged to clean the bag type dust collector. It has two states and three states, the number of cleaning times is 3~5 times/h, the cleaning power comes from the self-use pressure of the dust collector body, and the anti-blowing power is additionally provided in the special field; it belongs to the low kinetic energy cleaning type.
The chamber backflush bag type dust collector has the distinction of internal filtration and external filtration, and there is no difference in the selection of filter materials. For large and medium-sized dust collectors, there are usually round bags and no dust-removing skeleton; the filter bag has a length-to-diameter ratio of (15~40):1; it is preferred to use satin (or twill) woven filter material; in special occasions, it can also be strengthened with base cloth. The thin needle felt filter material has a thickness of 1.0 to 1.5 mm and a mass per unit area of ​​300 to 400 g/m. For small dust collectors, flat bags, diamond bags or honeycomb bags must be supported with a dust-removing skeleton. It is preferred to use thin needle-punched felt filter materials with good wear resistance and permeability, with a mass per unit area of ​​350-400 g/m.
(3) Vibrating backflushing and bag-type dust collector refers to a bag type dust collector that has both vibration and reverse airflow double cleaning action. The vibration makes the dust cake loose, and the reverse air flow makes the dust detach. The two methods cooperate with each other to improve the cleaning effect, and is especially suitable for fine particle viscous dust. The filter material selection principle of this type of dust collector is basically the same as that of the sub-chamber backflush type dust collector, and the main selection is the satin (or twill) woven filter material.
(4) The nozzle back-blow bag type dust remover uses the fan to perform the back-flushing dust-removing power. When the dust collector is in the filtered state, the filter bag is sequentially sprayed by moving the nozzle to form a strong reverse airflow. The bag filter that cleans the filter bag is of medium kinetic energy type.
For dust with strong abrasion, the following three points should be noted when selecting filter materials.
1 Chemical fiber is superior to glass fiber. Puffed glass fiber is superior to general glass fiber. Fine, short and curly fiber is superior to coarse, long and smooth fiber.
2 In the felt material, the interlacing property between the fibers should be strengthened by needle punching. The satin fabric is optimal in the fabric, and the brushing of the fabric surface is also a measure to improve the abrasion resistance, but the felt, the satin fabric and the fleece The filter material will increase the resistance value.
3 For ordinary filter material surface coating, calendering and other post-treatment can also improve wear resistance. For glass fiber filter, silicone oil, graphite , and polytetrafluoroethylene resin treatment, it can improve wear resistance and folding resistance. However, when the membrane filter material is used in a highly abrasive condition, the film will be worn out prematurely and the filming effect will be lost.
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