The invention discloses a back-cleaning device and method for detecting and removing cotton foreign fibers, and relates to the field of
textile equipment. The back-cleaning device comprises a
machine body, a main cotton channel, a back-cleaning channel, a foreign
fiber detection module, a spray valve module, a first
impurity-containing cotton conveying module, an opening module, a second
impurity-containing cotton conveying module, a waste cotton collecting module and a control module, a plurality of groups of foreign
fiber detection modules are arranged, and the plurality of groups of foreign
fiber detection modules are used for carrying out repeated and cyclic foreign fiber detection on the cotton flow in the main cotton channel and the cleaning channel. Single-
face detection and double-
face detection of the main cotton flow can be achieved, foreign fibers and
impurity-containing cotton in the to-be-detected cotton flow can be effectively removed, the impurity-containing cotton is subjected to re-cleaning and re-inspection, multi-channel cyclic re-inspection and foreign fiber removal of the impurity-containing cotton and recycling of the impurity-containing cotton are achieved, waste of the cotton in the foreign fiber removal process is reduced, and the cotton quality is improved. And meanwhile, the foreign fiber detection and removal rate is improved, and the economic benefit of a cotton
spinning mill is guaranteed.