| 摘要 |
Apparatus for filtering or collecting dust or other particulate matter which includes a plurality of filter elements that must be cleaned at periodic intervals by emitting a burst of cleaning air into the interior of the filter element so that it flows in a reverse direction to the normal flow of the transport air to remove particulate matter accumulated on the surface of the filter element. The cleaning air is emitted from a plurality of nozzles mounted on a horizontal arm that rotates above the filter elements, and each nozzle is provided with its own valve which can be opened to connect the nozzle to a source of pressurized cleaning air. A microprocessor is programmed to receive a reference signal when the horizontal arm reaches a predetermined point in its movement, after which the microprocessor is programmed to operate each of the valves in a predetermined sequence and at a predetermined timed frequency.
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