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Originally the word was an abbreviation of, and synonymous to, popular music, but developed around 1954 expressing a specific musical category. The stylistic origins of pop music is folk,jazz,R&B,rock and roll,traditional pop music.The typical instruments are guitar,bass guitar,drum kit and keyboard.The cultural origins go as far back to 1950's in the United States.It is popular worldwide since 1960s.
Principle: resulting in differential pressure. By differential pressure switch monitoring in and out of the nozzle pressure difference of change, when the differential pressure to set data, control device for hydraulic control valves, motor drive signal, caused by the following action: motor driving brush rotation, the filter cleaning, emission control valve to open at the same time, the whole cleaning process for dozens of seconds, at the end of the automatic brush filter when cleaning, close the valve, the motor stop running, system back to its initial state, began to filter into the next process
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