An impurity removal system for refining cotton, comprising an opening-and-impurity-removal mechanism (100), a gravity impurity-removal mechanism (200), a drum impurity-removal mechanism (300) and a secondary opening-and-impurity-removal mechanism (400), wherein,
- the opening-and-impurity-removal mechanism (100) comprises a first bin shell (1), a first induced draft fan (2), a conveying mechanism (60), a pressing roller (3), a first opening roller (4), a second opening roller (5), a first motor (6), a second motor (7), a screw rod (8), a sliding seat (9), a first rotary shaft (10), a third motor (11), a fourth motor (12), a first bottom plate (13) and a second bottom plate (14),
- a bottom of the first bin shell (1) is open, and a top of the first bin shell (1) is provided with a first discharge opening (16), an air inlet of the first induced draft fan (2) communicates with the first discharge opening (16) through a first air duct (17), a front wall of the first bin shell (1) is provided with a first feeding opening (18), from which a rear part of the conveying mechanism (60) penetrates into the first bin shell (1), the pressuring roller (3) is movably installed on the first feeding opening (18) of the first bin shell (1), and located above the conveying mechanism (60), the first opening roller (4) is movably installed in the first bin shell (1), located at a rear end of the conveying mechanism (60), and first saw teeth (21) are set on a periphery of the first opening roller (4), the first motor (6) is connected with the first opening roller (4), the second opening roller (5) is movably installed in the first bin shell (1), and second saw teeth (23) are set on a periphery of the second opening roller (5), the second motor (7) is connected with the second opening roller (5), the first bottom plate (13) and the second bottom plate (14) are respectively fixedly installed in the first bin shell (1) below the first opening roller (4) and the second opening roller (5), the first bottom plate (13) and the second bottom plate (14) respectively present an arc shape corresponding to the first opening roller (4) and the second opening roller (5), an impurity-discharging hole (24) is set in the second bottom plate (14), an inner top of the first bin shell (1) is provided with a pair of supporting plates (40), between which a guiding column (41) is set, the third motor (11) is fixedly installed on an outer wall of the first bin shell (1), the screw rod (8) is movably installed on the pair of supporting plates (40), and one end of the screw rod (8) protrudes from the first bin shell (1) and is connected with the third motor (11), a through hole (43) and a screw hole (44) are set in the sliding seat (9), which movably encircles the guiding column (41) through the through hole (43), and the screw rod (8) is rotationally set in the screw hole (44) of the sliding seat (9), the first rotary shaft (10) is movably installed on the sliding seat (9), on which the fourth motor (12) is fixedly installed, and is connected to the first rotary shaft (10), and stirring rods (47) in a row are set on the first rotary shaft (10),
- the gravity impurity-removal mechanism (200) comprises a second bin shell (A1), a sixth motor (A2), a middle shaft (A3), a sieving hopper (A4), a seventh motor (A5), a second rotary shaft (A6), a cam (A7), a pulley (A8), a covering plate (A9) and a second induced draft fan (A10),
- a second feeding opening (A19) is set on a side of the second bin shell (A1), a top of the second bin shell (A1) is provided with a second discharging opening (A20), an air outlet of the first induced draft fan (2) communicates with the second feeding opening (A19) through a first pipe (S1), and an air inlet of the second induced draft fan (A10) communicates with the second discharging opening (A20) through a second air duct (A39), a bottom of the second bin shell (A1) is provided with a first impurity-discharging opening (A21), and the covering plate (A9) is hinged and set at the first impurity-discharging opening (A21) of the second bin shell (A1), a locking mechanism (A40) is set between the second bin shell (A1) and the covering plate (A9), a guiding hole (A29) is set on an inner side wall of the second bin shell (A1), the sieving hopper (A4) is located in the second bin shell (A1), a bottom of the sieving hopper (A4) is provided with a guiding column (A30), which is movably inserted in the guiding hole (A29), a first sieving hole (A31) is set in a bottom wall of the sieving hopper (A4), and an axis hole (A32) is set in a top wall of the second bin shell (A1), the middle shaft (A3) is movably inserted into the second bin shell (A1) through the axis hole (A32), and the sixth motor (A2) is connected to the middle shaft (A3), the middle shaft (A3) is provided with a transverse rod (A33), which is provided with a raking rod (A34), and the raking rod (A34) extends downward into the sieving hopper (A4), the second rotary shaft (A6) is movably inserted in the second bin shell (A1), and the cam (A7) is fixedly installed on the second rotary shaft (A6), the pulley (A8) is movably installed on the cam (A7), and the pulley (A8) is located under the bottom of the sieving hopper (A4), the seventh motor (A5) is connected with the second rotary shaft (A6),
- the drum impurity-removal mechanism (300) comprises a fourth bin shell (B1), a third induced draft fan (B2), a fourth induced draft fan (B3), a drum (B4), a thirteenth motor (B5), a fourteenth motor (B6), a connecting sleeve (B7), and a fourth rotary shaft (B9),
- a side part of the fourth bin shell (B1) is provided with a fourth feeding opening (B10), an air outlet of the second induced draft fan (A10) communicates with the fourth feeding opening (B10), the drum (B4) is movably installed in the fourth bin shell (B1), and is tube shaped, and first mesh (B12) is set on a peripheral wall of the drum (B4), a first scraper (B13) is set at the fourth feeding opening (B10) inside the fourth bin shell (B1), one end of the first scraper (B13) is configured to be adjacent to outer peripheral wall of the drum (B4), one end of the drum (B4) is provided with an impurity-discharging pipe (B14), an outer periphery of the impurity-discharging pipe (B14) is provide with an annular hump (B15), the connecting sleeve (B7) is fixedly installed on an outer wall of the fourth bin shell (B1), and the impurity-discharging pipe (B14) is movably mounted in the connecting sleeve (B7) with the annular hump (B15), and communicates with the connecting sleeve (B7), the third induced draft fan (B2) communicates with the connecting sleeve (B7) through a third air duct (B16), and the thirteenth motor (B5) is connected with the drum (B4), a bottom of the fourth bin shell (B1) is provided with a discharging pipe (B19), two side walls of the discharging pipe (B19) are respectively provided with arc plates (B20) having a same center of circle and same radius, an impurity-absorbing cavity (B21) is set on an outer side of the arc plate (B20) at one side, and second mesh (B22) communicating with the impurity-absorbing cavity (B21) is set on that arc plate (B20), and an impurity-outlet (B23) is set on an outer wall of the impurity-absorbing cavity (B21), the fourth induced draft fan (B3) communicates with the impurity-outlet (B23) through a fourth air duct (B24), the fourth rotatory shaft (B9) is movably inserted in the discharging pipe (B19), and a second scraper (B26) is set on the fourth rotatory shaft (B9), one end of the second scraper (B26) is configured to be adjacent to an inner side wall of the arc plate (B21), the fourteenth motor (B6) is connected with the fourth shaft (B9),
- the secondary opening-and-impurity-removal mechanism (400) comprises a third bin shell (C1), a pair of first lickers-in (C2), a second licker-in (C3), an eighth motor (C4), a ninth motor (C5), a vibrating sieve plate (C6), a tenth motor (C7), a third rotatory shaft (C8), a connecting rod (C9), a conveying shaft (C10), an eleventh motor (C11), a third opening roller (C12) and a twelfth motor (C13),
- a third feeding opening (C17) is set in a top of the third bin shell (C1), and the discharging pipe (B19) is connected to the third feeding opening (C17) through a second pipe (S2), a division plate (C14) is set in the third bin shell (C1), and an impurity-discharging channel (C15) is formed between the division plate (C14) and an inner wall of one side of the third bin shell (C1), a bottom of the third bin shell (C1) is provided with a conveying trough (C18), at a bottom of the conveying trough (C18) a second impurity-discharging opening (C19) is set, a lifting channel (C20) communicating with an inside of the third bin shell (C1) is set in a side of the third bin shell (C1), and a third discharging opening (C21) is set at an upper end of the lifting channel (C20), an impurity-leaking plate (C22) is set in the third bin shell (C1) and the lifting channel (C20), and two ends of the impurity-leaking plate (C22) are fixed at the division plate (C14) and the third discharging opening (C21) of the lifting channel (C20), the pair of first lickers-in (C2) are respectively movably installed at the third feeding opening (C17) of the third bin shell (C1), a periphery of the first lickers-in (C2) is provide with a first spike (C50), and the eighth motor (C4) is connected with the pair of first lickers-in (C2), the second licker-in (C3) is movably installed in the third bin shell (C1) below the pair of the first lickers-in (C2), a second spike (CM) is set on a periphery of the second licker-in (C3), and the ninth motor (C5) is connected with the second licker-in (C3), the third rotatory shaft (C8) is movably inserted in the third bin shell (C1), and a flying wheel disk (C33) is set on the third rotatory shaft (C8), one end of the vibrating sieve plate (C6) is hinged to an inner wall of the third bin shell (C1), one end of the connecting rod (C9) is hinged to the flying wheel disk (C33), and the other end of the connecting rod (C9) is hinged to the other end of the vibrating sieve plate (C6), the vibrating sieve plate (C6) is located above the impurity-discharging channel (C15) and below the second licker-in (C3), a second sieving hole (C37) is set on the vibrating sieve plate (C6), and the tenth motor (C7) is fixedly installed on the third bin shell (C1), and connected with the third rotatory shaft (C8), the conveying shaft (C10) is movably installed in the conveying trough (C18), and a spiral rib plate (C40) is set on the conveying shaft (C10), the third opening roller (C12) is movably installed in the third bin shell (C1) and the lifting channel (C20) with an incline, third saw teeth (C43) are set on a periphery of the third opening roller (C12), the impurity-leaking plate (C22) is located below the third opening roller (C12), and continuous arcs of the impurity-leaking plate (C22) are configured to respectively correspond to the third opening rollers (C12), impurity-leaking holes (C44) are set in the impurity-leaking plate (C22), and the twelfth motor (C13) is in connected with the third opening rollers (C12) in a row.