阅读说明：本技术 一种提高梳棉机除杂及分梳能力的预分梳除杂装置 (Pre-carding impurity removal device capable of improving impurity removal and carding capacity of carding machine ) 是由 刘延武 白莹 李新奇 王少平 杨国全 文永斐 杨丽珍 王焜平 杜英杰 王念政 于 2019-11-05 设计创作，主要内容包括：一种提高梳棉机除杂及分梳能力的预分梳除杂装置,在梳棉机主锡林区域的回转盖板的进口处设置一组分梳除杂机构,所述分梳除杂机构包括一个预分梳除杂辊、一个清洁辊、一组吸风风道以及传动装置；在预分梳除杂辊上包覆有除杂辊弹性针布,清洁辊位于预分梳除杂辊上方,在清洁辊上包覆有清洁用的清洁辊针布；由除尘板Ⅰ、Ⅱ组成的密封的输送风道上部分别与回转盖板清洁结构中的吸罩和除尘板连接,下部与梳除杂机构的罩壳相连；在除尘板Ⅱ下方、预分梳除尘辊及清洁辊相交处设置一个三角形的除尘刀；在预分梳除杂辊与主锡林接触位置处的前后部位分别安装有预分梳除杂辊后罩板和预分梳除杂辊前罩板,且在预分梳除杂辊前罩板靠近预分梳除杂辊一侧装有除尘刀。(A pre-carding impurity removal device for improving impurity removal and carding capacity of a carding machine is characterized in that a group of carding impurity removal mechanisms are arranged at an inlet of a rotary cover plate of a main cylinder area of the carding machine, and each carding impurity removal mechanism comprises a pre-carding impurity removal roller, a cleaning roller, a group of air suction channels and a transmission device; the pre-carding impurity removing roller is coated with impurity removing roller elastic card clothing, the cleaning roller is positioned above the pre-carding impurity removing roller, and the cleaning roller is coated with cleaning roller card clothing for cleaning; the upper part of a sealed conveying air duct consisting of dust removing plates I and II is respectively connected with a suction hood and the dust removing plates in the rotary cover plate cleaning structure, and the lower part of the sealed conveying air duct is connected with a hood shell of the carding and impurity removing mechanism; a triangular dust removing knife is arranged below the dust removing plate II and at the intersection of the pre-carding dust removing roller and the cleaning roller; the front part and the rear part of the contact position of the pre-carding impurity-removing roller and the main cylinder are respectively provided with a pre-carding impurity-removing roller rear cover plate and a pre-carding impurity-removing roller front cover plate, and one side of the pre-carding impurity-removing roller front cover plate, which is close to the pre-carding impurity-removing roller, is provided with a dust removing knife.)

1. The utility model provides an improve carding machine edulcoration and carding ability's presorting comb edulcoration device which characterized in that: a group of carding and impurity removing mechanisms are arranged at an inlet of a rotary cover plate (22) in a main cylinder area of the carding machine, and each carding and impurity removing mechanism comprises a pre-carding and impurity removing roller (4), a cleaning roller (9), a group of air suction channels and a transmission device; the pre-carding impurity removing roller (4) is coated with impurity removing roller elastic card clothing (7) which plays roles in pre-carding, impurity removing and short velvet and neps removing, the cleaning roller (9) is positioned above the pre-carding impurity removing roller (4), and the cleaning roller (9) is coated with cleaning roller card clothing (10) for cleaning and used for cleaning impurities, short velvet and neps carried on the pre-carding impurity removing roller (4); the upper part of a sealed conveying air duct consisting of a dust removing plate I (12) and a dust removing plate II (14) is respectively connected with a suction hood (13) and a dust removing plate (16) in a rotary cover plate cleaning structure, and the lower part of the sealed conveying air duct is connected with a housing (8) of a carding and impurity removing mechanism; a triangular dust removing knife (11) is arranged below the dust removing plate II (14) and at the intersection of the pre-carding dust removing roller (4) and the cleaning roller (9); the pre-carding impurity removal roller rear cover plate (3) and the pre-carding impurity removal roller front cover plate (6) are respectively installed at the front part and the rear part of the contact position of the pre-carding impurity removal roller (4) and the main cylinder (23), and a dust removal knife (5) used for ensuring the sealing performance of the carding area of the main cylinder and further improving the impurity removal capability is installed on one side, close to the pre-carding impurity removal roller (4), of the pre-carding impurity removal roller front cover plate (6).

2. The pre-carding impurity removal device for improving impurity removal and carding capacity of a carding machine according to claim 1, wherein: the elastic card clothing (7) of the impurity removing roller has the same needle height and angle with the card clothing (24) of the rotary cover plate, the density of the needle teeth is less than that of the card clothing (24) of the rotary cover plate, and the tooth tip direction of the elastic card clothing is opposite to the tooth tip direction of the main cylinder card clothing (39).

3. The pre-carding impurity removal device for improving impurity removal and carding capacity of a carding machine according to claim 1, wherein: the rotating direction of the pre-carding impurity removing roller (4) and the rotating direction of the main cylinder (4) are opposite to each other and rotate at a low speed lower than 1m/min, the impurity removing roller elastic card clothing (7) and the main cylinder card clothing (39) form a pre-carding function, and a part of large short fibers, impurities and neps generated in the previous process are contained between the elastic card clothing and taken away.

4. The pre-carding and impurity-removing device for improving impurity-removing and carding capabilities of a carding machine according to claim 1, wherein teeth of the elastic card clothing (10) for cleaning are higher than those of the elastic card clothing (7) of the impurity-removing roller, the elastic card clothing and the elastic card clothing (7) of the impurity-removing roller are arranged at a negative interval of 0.5 ~ 1.5.5 mm, the bending direction of the front end of the card clothing (10) of the cleaning roller is the same as that of the front end of the elastic card clothing (7) of the impurity-removing roller, and the rotating direction of the cleaning roller (9) deviates from that of the pre-carding and impurity-removing roller (4) and rotates at a high speed of 400-500 m/min.

5. The pre-carding impurity removal device for improving impurity removal and carding capacity of a carding machine according to claim 1, wherein: the power of the pre-carding impurity removing roller (4) and the cleaning roller (9) is respectively driven by a cover plate gear shaft (20) and a cover plate cleaning motor (30); or two motors are arranged to respectively drive the pre-carding impurity removing roller (4) and the cleaning roller (9).

6. The pre-carding impurity removal device for improving impurity removal and carding capacity of a carding machine according to claim 1, wherein: the distance between the roller body of the pre-carding impurity removing roller (4) and the main cylinder (23) is set to be 0.4-0.5 mm, is larger than the distance between the inlet of the rotary cover plate (22) and the main cylinder (23), and is smaller than the distance between the last group of adjacent rear fixed cover plates and the main cylinder (23).

Technical Field

The invention relates to cotton carding equipment in textile machinery, in particular to a pre-carding impurity removal device for improving impurity removal and carding capacity of a carding machine.

Background

In the working area of the main cylinder of the carding machine, the main cylinder and the rotary cover plate form a main carding area of the carding machine. The main cylinder rotates at a linear speed of 2000 meters per minute, and the rotary cover plate performs curvilinear motion along an arc line fitting the diameter of the excircle of the cylinder at a linear speed of less than one meter per minute. The distance between the movable cover plate and the cylinder is gradually reduced from the fiber inlet to the fiber outlet. In the main carding zone, the carding and the removal of impurities of the fibres substantially pass through three stages. In the first stage, when the fiber just enters the inlet of the carding area, the fiber is bigger, and the short fiber, the impurity and the nep are also bigger, at the moment, the big fiber is gradually decomposed and reduced through carding, and the short fiber, the impurity and the nep are also decomposed and reduced, and a part of the big impurity is sprayed into the flat clothing of the cover plate; in the second stage, in the middle section of the carding area, the decomposed and reduced fibers are further carded into finer fiber bundles in the second stage, short fibers, impurities and neps are also further decomposed and reduced, and the carding and impurity removal strength in the second stage is very high; in the third stage, at the outlet of the carding area, the fibers can be thoroughly carded into single fibers, and short fibers, impurities and cotton knots can also become very fine and are adsorbed on the cover plate patterns formed by the cover plate card clothing due to impurity removal in the first two stages. Finally, the fiber layer decomposed into single fiber state enters the subsequent process, and the cover board flowers (short fibers, impurities and neps) are cleaned by the cover board cleaning device.

The carding principle of the rotary cover plate is described above. The running directions of the rotary cover plate are two types: initially, the direction of travel of the revolving deck is the same as the main cylinder, as shown in fig. 7. When the main cylinder carries the fibers into the area of the rotary cover plate, the cover plate is clean, and the carding capacity is strongest. At this time, due to the carding of the main cylinder and the cover plate and the centrifugal force when the main cylinder rotates at a high speed, a large amount of short fibers, impurities and neps are sprayed on the rotary cover plate. When the movable cover plate is moved to the middle position of the carding area, the load of the cover plate is heavy, and the impurity removal capability is greatly reduced. When the movable cover plate runs to the outlet of the carding area, the fine fiber bundles are thoroughly decomposed into single fibers by strong carding capacity, and just in the area, the surface of the cover plate is basically and completely filled by the cover plate patterns, so that the carding capacity and the impurity removal capacity are weakened, and the aim of carding cannot be achieved. And too much apron flowers on the apron surface lead to the impurity that this region produced can't adsorb on the elastic card clothing of cladding on the apron, and the impurity that this region produced, even include the bold impurity that produces in first, second region, all probably are taken away by main cylinder, get into the subsequent handling, lead to the fibre to become dirty, be very unfavorable for production.

For the above reasons, all existing carding machines adopt a mode of reversing the revolving flat, namely, the revolving direction of the main cylinder is opposite, as shown in fig. 5. The cover plate runs in the reverse direction, the card clothing of the cover plate is clean at the outlet of the carding area, and meanwhile, the impurities in the area are thinner and less than those at the inlet, so the carding area has strong carding function, can more thoroughly comb the fiber bundles into single fibers, and avoids the possibility that dirty fibers enter the subsequent process. When the cover plate moves to the middle position of the carding area, although a part of short fibers, impurities and neps are carried, the quantity of the short fibers, the impurities and the neps is reduced compared with the cover plate which rotates forwards, and the cover plate plays a positive role in carding and impurity removal of the middle area. Problems arise when the cover plate is moved to the entry location of the carding area. At this time, the surface of the cover plate is basically filled by the cover plate patterns, impurities at the inlet cannot be brought to the next process due to the fact that the cover plate is reversely rotated, the carding capacity is greatly reduced due to the fact that a part of the card clothing of the cover plate at the inlet is filled by the cover plate patterns, carding force on large fibers at the inlet is insufficient, fiber bundles entering the second area are large, burden of subsequent carding is increased, and once yield is increased, neps are also increased, and influence on yield is obvious.

Disclosure of Invention

The invention aims to provide a pre-carding impurity removal device for improving impurity removal and carding capacity of a carding machine aiming at the defects in the prior art. The pre-carding and impurity-removing device cancels a rear web cleaner positioned at the inlet of the rotary cover plate and replaces the rear web cleaner with a group of pre-carding and impurity-removing mechanisms before the main cylinder carding area of the carding machine enters the rotary cover plate. Before the fibre got into the gyration apron, earlier through presorted carding of edulcoration mechanism, edulcoration, tentatively decompose the bold fibre, partly bold impurity is cleared up through this mechanism for the fibre that gets into the gyration apron is less, and impurity is corresponding to be reduced, in order to alleviate the work burden in apron region, promotes the ability of carding and edulcoration of carding machine.

The object of the invention can be achieved by the following measures:

the invention discloses a pre-carding impurity removal device for improving impurity removal and carding capacity of a carding machine, which is characterized in that: the carding machine is characterized in that a group of carding and impurity removing mechanisms are arranged at an inlet of a rotary cover plate of a main cylinder area of the carding machine, and each carding and impurity removing mechanism comprises a pre-carding and impurity removing roller, a cleaning roller, a group of air suction channels and a transmission device; the pre-carding and impurity-removing roller is coated with impurity-removing roller elastic card clothing which plays roles in pre-carding, impurity removal and short fiber and neps removal, the cleaning roller is positioned above the pre-carding and impurity-removing roller, and the cleaning roller is coated with cleaning roller card clothing for cleaning and used for cleaning impurities, short fibers and neps carried on the pre-carding and impurity-removing roller; the upper part of a sealed conveying air duct consisting of a dust removing plate I and a dust removing plate II is respectively connected with a suction hood and the dust removing plate in the rotary cover plate cleaning structure, and the lower part of the sealed conveying air duct is connected with a housing of the carding and impurity removing mechanism; a triangular dust removing knife is arranged below the dust removing plate II and at the intersection of the pre-carding dust removing roller and the cleaning roller; the sealed conveying air duct processes impurities, short fibers and neps thrown out by the cleaning roller in a high-speed rotation mode by means of wind power of the cover plate air suction opening; the front part and the rear part of the contact position of the pre-carding impurity removal roller and the main cylinder are respectively provided with a pre-carding impurity removal roller rear cover plate and a pre-carding impurity removal roller front cover plate, and one side of the pre-carding impurity removal roller front cover plate, which is close to the pre-carding impurity removal roller, is provided with a dust removal knife which is used for ensuring the sealing property of the carding area of the main cylinder and further improving the impurity removal capability.

The elastic card clothing of the impurity removing roller has the same needle height and angle with the card clothing of the rotary cover plate, the density of the needle teeth is less than that of the card clothing of the rotary cover plate, and the direction of the tooth tips of the elastic card clothing of the impurity removing roller is opposite to the direction of the tooth tips of the card clothing of the main cylinder.

The rotation direction of the pre-carding and impurity removing roller is opposite to the rotation direction of the main cylinder and rotates at a low speed lower than 1m/min, the elastic card clothing of the impurity removing roller and the card clothing of the main cylinder form a pre-carding effect, and a part of large short fibers, impurities and neps generated in the previous process are contained between the elastic card clothing and taken away.

The teeth of the cleaning roller card clothing are higher than the impurity removing roller elastic card clothing and are arranged at a negative interval of 0.5 ~ 1.5.5 mm with the impurity removing roller elastic card clothing, the bending direction of the front end of the cleaning roller card clothing is the same as that of the front end of the impurity removing roller elastic card clothing, the rotating direction of the cleaning roller is deviated from that of the pre-carding impurity removing roller, and the cleaning roller card clothing rotates at a high speed of 400-500 m/min.

The power of the pre-carding impurity removing roller and the power of the cleaning roller are respectively driven by a cover plate gear shaft and a cover plate cleaning motor (30); or two motors are arranged to respectively drive the pre-carding impurity removing roller and the cleaning roller (it needs to be explained that a cover plate gear shaft is driven by a main cylinder motor, and the cover plate cleaning motor and the main cylinder motor are both arranged in the original transmission system of the carding machine, so that a new motor is not required to be added under the general condition).

The distance between the roller body of the pre-carding impurity removing roller and the main cylinder is set to be 0.4-0.5 mm, is larger than the distance between the inlet of the rotary cover plate and the main cylinder, and is smaller than the distance between the last group of adjacent rear fixed cover plates and the main cylinder.

The working principle of the invention is as follows:

before the raw cotton fibers enter the main cylinder carding area, after carding and impurity removal are carried out on the raw cotton fibers by the last group of fixed cover plates (two plates), the impurities generated by carding the fixed cover plates are not removed by the rear cotton net cleaner, but the rear cotton net cleaner is replaced by a group of pre-carding impurity removal mechanisms. The pre-carding impurity removing mechanism comprises a pre-carding impurity removing roller, a cleaning roller, a pre-carding impurity removing roller, a housing around the cleaning roller, an air suction duct and a transmission device. And the fiber from the first path enters the carding area of the pre-carding impurity removing roller after being carded by the last group of fixed cover plates, and the fiber is further carded and reduced. Before entering the carding area of the rotary cover plate formally, the presorting carding of the fiber can reduce the carding pressure of the rotary cover plate to a certain extent, which is beneficial to production. And the fibre after the back fixed cover plate carding, the short staple, impurity and the nep that itself carried to and the short staple, impurity and nep that the pre-carding edulcoration roller carding produced also can some enter into in the card clothing gap of pre-carding edulcoration roller, along with the rotation of pre-carding edulcoration roller, shift to the top, clear up by the high-speed rotatory cleaning roller that the cladding has clean special card clothing again, cooperate the wind channel of induced drafting at last to send into the apron wind channel with short staple, impurity and nep, finally get into the dirt system that strains. Before entering the carding area of the revolving cover plate formally, the fibers remove a part of short fibers, impurities and neps in advance, which is very beneficial to carding in the revolving cover plate area and plays an active role in improving the yield of the carding machine.

The invention mainly utilizes the method of pre-carding and impurity removal before the fiber leaves the last group of fixed cover plates and enters the rotary cover plate to improve the impurity removal and carding capability of the main carding area of the carding machine. The core working principle of pre-carding impurity removal is as follows: the pre-carding impurity removing roller is coated with elastic card clothing with the same needle height and angle as the card clothing of the rotary cover plate, the density of the needle teeth is slightly less than that of the card clothing of the rotary cover plate, and the tooth tips of the elastic card clothing face to the direction opposite to the tooth tips of the card clothing of the main cylinder; the rotation direction of the pre-carding impurity removing roller is opposite to the rotation direction of the main cylinder and rotates at a low speed of not more than 1m/min, so that the pre-carding impurity removing roller can form a pre-carding effect with the card clothing of the main cylinder and can hold and take away a part of massive short fibers, impurities and neps generated in the previous process among the elastic card clothing. The cleaning roller above the pre-carding impurity removing roller is coated with elastic card clothing with cleaning function, the tooth height is higher than the card clothing on the pre-carding impurity removing roller, and the card clothing is negative gauge with the card clothing of the pre-carding impurity removing roller, and is about 1 mm; the direction of the cleaning roller card clothing is the same as that of the pre-carding impurity removal roller card clothing; the rotating direction of the cleaning roller deviates from the rotating direction of the pre-carding and impurity removing roller, the cleaning roller rotates at a high speed of about 400-500 m/min, and short fibers, impurities and neps filled between the card clothing of the pre-carding and impurity removing roller are cleaned at a high frequency, so that the pre-impurity removing effect is formed.

The beneficial effects of the invention are as follows:

1. in the carding area of the main cylinder of the carding machine, before entering the revolving flat, the traditional method is that a rear web cleaner sucks away short fibers, impurities and neps generated by carding of a part of rear fixed flat. However, this method only removes a small part of large short fibers, impurities and neps, has no carding function, and cannot adsorb and remove more short fibers, impurities and neps. And after the pre-carding impurity removing roller replaces the rear cotton net cleaner, the pre-carding function is increased, and more short fibers, impurities and neps can be adsorbed in the elastic card clothing of the pre-carding impurity removing roller. The large fibers are further reduced and are combed more before entering the rotary cover plate, the number of short fibers, impurities and neps at the inlet of the rotary cover plate is reduced, and the impurity removal burden of the rotary cover plate is reduced.

2. When the pre-carding impurity removing roller rotates to the upper part at a constant speed at an extremely low speed, a certain amount of short fibers, impurities and neps are gathered in the elastic card clothing coated on the excircle of the pre-carding impurity removing roller, and different from a cover plate flower, the short fibers, the impurities and the neps on the pre-carding impurity removing roller cannot be accumulated and overlapped, and all the short fibers, the impurities and the neps are better cleaned. Short fibers, impurities and neps on the pre-carding impurity removing roller can be cleaned up only by arranging a cleaning roller rotating at a high speed above the pre-carding impurity removing roller, and the short fibers, the impurities and the neps cannot return to the main cylinder.

3. An air suction duct is arranged above the cleaning roller, an opening is formed below the air suction duct of the original rotary cover plate cleaning structure, and the upper part of the air suction duct is connected with the air duct of the original rotary cover plate cleaning structure; a housing is arranged outside the pre-carding dust removing roller and the cleaning roller, and the lower part of the air suction duct is connected with the housing; in addition, a triangular dust removing knife is arranged at the intersection of the pre-carding dust removing roller and the cleaning roller below the dust removing plate 2 on the right side of the air suction duct, so that a sealed conveying air duct is formed from the pre-carding dust removing roller, the cleaning roller and the cover plate air suction duct, impurities, short fibers and neps thrown out by the high-speed rotation of the cleaning roller in the pre-carding impurity removing mechanism can be treated by means of the wind power induced by the cover plate air suction, and a new suction port does not need to be added in an original air suction system of the carding machine.

4. The driving devices required by the pre-carding impurity removing roller and the cleaning roller are respectively provided by an original rotary cover plate gear shaft and a cover plate cleaning motor in an original rotary cover plate cleaning mechanism. Lengthening the shaft end of an original rotary cover plate gear shaft, arranging two synchronous belt pulleys at the shaft ends of the original rotary cover plate gear shaft and the pre-carding impurity-removing roller, and transmitting the synchronous belt pulleys according to a certain transmission ratio to enable the pre-carding impurity-removing roller to rotate at a set speed; the cleaning roller in the pre-carding and impurity removing mechanism and the cleaning roller in the original rotary cover plate cleaning mechanism share the original cover plate cleaning motor. The cover plate gear shaft is driven by the main cylinder motor, and the cover plate cleaning motor and the main cylinder motor are both arranged in the original transmission system of the carding machine, so that a new motor is not required to be added. Like this, only expand the transmission space in the axial dimension, other two dimensions do not change, have simplified spatial structure greatly.

In conclusion, the carding machine has the advantages that the carding area of the main cylinder of the carding machine is changed at least, the mechanical design is simplified, the modification cost is low, and the impurity removal and carding capacity of the carding area of the main cylinder of the carding machine can be improved, so that the yield of the carding machine is improved, and the cotton sliver index is optimized.

Drawings

FIG. 1 is a design diagram of a pre-carding and impurity-removing mechanism in the invention.

FIG. 2 is an enlarged view of a pre-carding impurity removal mechanism in the present invention.

FIG. 3 is a transmission schematic diagram of a pre-carding impurity removing mechanism in the invention.

FIG. 4 is a working principle diagram of a pre-carding impurity removing mechanism in the invention.

FIG. 5 is a design drawing of carding and impurity removal at the inlet of a revolving flat of a carding machine in the prior art (the running direction of the revolving flat is opposite to that of a main cylinder).

FIG. 6 is an enlarged view of the design drawing of carding and impurity removal at the inlet of the revolving flat of the prior art (the running direction of the revolving flat is opposite to that of the main cylinder).

FIG. 7 is a design drawing of carding and impurity removal at the inlet of a revolving flat of a carding machine in the prior art (the running direction of the revolving flat is the same as that of a main cylinder).

Numbers in fig. 1-7: 1. rear fixed cover plates (front, middle and rear groups) 2, a universal suction inlet 3, a pre-carding impurity removal roller rear cover plate 4, a pre-carding impurity removal roller 5, a dust removing knife 6, a pre-carding impurity removal roller front cover plate 7, impurity removal roller elastic card clothing 8, a pre-carding dust removal roller and a cover shell 9 outside the cleaning roller, a cleaning roller 10, cleaning roller card clothing 11, a triangular dust removing knife 12, a dust removing plate 113, a suction cover 14 in the original rotary cover plate cleaning structure, a dust removing plate 215, a cover plate air suction inlet 16, a dust removing plate 17 in the original rotary cover plate cleaning structure, cleaning roller card clothing 18 for the original rotary cover plate cleaning, a cleaning roller 19 for the original rotary cover plate cleaning, a large hair brush roller 20 for the original rotary cover plate cleaning, a rotary cover plate gear shaft 21, a group of rotary cover plate frameworks 22, a rotary cover plate 23, a main cylinder 24, elastic card clothing 25 for the rotary cover plate, The cleaning device comprises a large brush roller card clothing 26 for cleaning an original rotary cover plate, a driven belt wheel 27 arranged on a pre-carding and impurity removing roller, a driven belt wheel 28 arranged on the cleaning roller, a synchronous belt 29 for driving the cleaning roller, a synchronous belt 30 for driving the pre-carding and impurity removing roller, an original rotary cover plate cleaning motor 31, a synchronous belt wheel 32 arranged on the cleaning roller for cleaning the original rotary cover plate, a driving belt wheel 33 arranged on the original rotary cover plate cleaning motor, a driving belt wheel 34 arranged on a gear shaft of the rotary cover plate, a sealing strip 35, a rear cotton net cleaner 36 arranged at an inlet of the original rotary cover plate, a dust removing knife 37, a front cover plate 38 of the rear cotton net cleaner, a rotary cover plate 39 and main cylinder card clothing.

Detailed Description

The invention will be further described with reference to the following examples (drawings):

as shown in figures 1 and 4, the pre-carding impurity removal device for improving the impurity removal and carding capacity of the carding machine is characterized in that: a group of carding and impurity removing mechanisms are arranged at an inlet of a rotary cover plate of a main cylinder area of the carding machine, and each carding and impurity removing mechanism comprises a pre-carding and impurity removing roller 4, a cleaning roller 9, a group of air suction channels and a transmission device; the pre-carding impurity removing roller 9 is coated with impurity removing roller elastic card clothing 7 which plays roles of pre-carding, impurity removing and short velvet and neps removing, the cleaning roller 9 is positioned above the pre-carding impurity removing roller 4, and the cleaning roller 9 is coated with cleaning roller card clothing 10 for cleaning and used for cleaning impurities, short velvet and neps carried on the pre-carding impurity removing roller 4; the upper part of a sealed conveying air duct consisting of a dust removing plate I12 and a dust removing plate II 14 is respectively connected with a suction hood 13 and a dust removing plate 16 in a rotary cover plate cleaning structure, and the lower part of the sealed conveying air duct is connected with a housing (8) of a carding and impurity removing mechanism; a triangular dust removing knife 11 is arranged below the dust removing plate II 14 and at the intersection of the pre-carding dust removing roller 4 and the cleaning roller 9; the sealed conveying air duct processes impurities, short fibers and neps thrown out by the cleaning roller 9 in a high-speed rotation mode by means of wind power of the cover plate air suction opening 15; the front part and the rear part of the contact position of the pre-carding impurity removal roller 4 and the main cylinder 23 are respectively provided with a pre-carding impurity removal roller rear cover plate 3 and a pre-carding impurity removal roller front cover plate 6, and one side of the pre-carding impurity removal roller front cover plate 6 close to the pre-carding impurity removal roller 4 is provided with a dust removal knife 5 for ensuring the sealing property of the carding area of the main cylinder and further improving the impurity removal capability.

The elastic card clothing 7 of the impurity removing roller has the same needle height and angle with the card clothing 24 of the rotary cover plate, the density of the needle teeth is less than that of the 24 needle teeth of the card clothing of the rotary cover plate, and the direction of the tooth tips of the elastic card clothing 7 is opposite to the direction of the tooth tips of the card clothing 39 of the main cylinder.

The rotating direction of the pre-carding impurity removing roller 4 and the rotating direction of the main cylinder 4 are opposite to each other and rotate at a low speed lower than 1m/min, the elastic card clothing 7 of the impurity removing roller and the card clothing 39 of the main cylinder form a pre-carding effect, and a part of large short fibers, impurities and neps generated in the previous process are contained between the elastic card clothing and taken away.

The tooth height of the cleaning roller card clothing (10) is higher than that of the impurity removing roller elastic card clothing 7, the cleaning roller card clothing and the impurity removing roller elastic card clothing 7 are arranged at a negative interval of 0.5 ~ 1.5.5 mm, the bending direction of the front end of the cleaning roller card clothing 10 is the same as that of the front end of the impurity removing roller elastic card clothing 7, the rotating direction of the cleaning roller 9 is opposite to that of the pre-carding impurity removing roller 4, and the cleaning roller rotates at a high speed of 400-500 m/min.

The power of the pre-carding impurity removing roller 4 and the cleaning roller 9 is respectively driven by a cover plate gear shaft 20 and a cover plate cleaning motor 30; or two motors are arranged to respectively drive the pre-carding impurity removal roller 4 and the cleaning roller 9 (it is to be noted that, because the cover plate gear shaft 20 is driven by the main cylinder motor, and the cover plate cleaning motor 30 and the main cylinder motor are both in the original transmission system of the carding machine, a new motor is not required to be added under the general condition).

The distance between the roller body of the pre-carding impurity removing roller 4 and the main cylinder 23 is set to be 0.4-0.5 mm, is larger than the distance between the inlet of the rotary cover plate 22 and the main cylinder 23, and is smaller than the distance between the last group of adjacent rear fixed cover plates 1 and the main cylinder 23.

More specifically, the present invention eliminates the rear web cleaner 35 (see fig. 5 and 6) at the entrance of the revolving flat 22 before the carding area of the main cylinder of the carding machine enters the revolving flat 22, and replaces it with a set of pre-carding and impurity removing mechanisms (so that other parts around the main cylinder except the pre-carding and impurity removing rollers and the front and rear cover plates thereof can be kept in the original design without modification). The upper part of a conveying air duct consisting of a dust removing plate I12 and a dust removing plate II 14 is connected with a suction hood 13 and a dust removing plate 16 in a rotary cover plate cleaning structure in the prior art, the lower part of the conveying air duct is connected with a pre-carding dust removing roller 4 and a hood 8 outside the cleaning roller 9, and impurities, short fibers and neps thrown out by the cleaning roller 9 in a high-speed rotation mode can be treated by means of wind power of a cover plate air suction opening 15; the transmission device is responsible for the power of the pre-carding impurity removing roller 4 and the cleaning roller 9 and is respectively driven by the original cover plate gear shaft 20 and the original cover plate cleaning motor 30, and because the cover plate gear shaft 20 is driven by the main cylinder motor, and the cover plate cleaning motor 30 and the main cylinder motor are both in the original transmission system of the carding machine, no new motor is needed to be added; two cover plates, namely a pre-carding impurity removal roller rear cover plate 3 and a pre-carding impurity removal roller front cover plate 6, are respectively arranged at the contact position of the pre-carding impurity removal roller 4 and the main cylinder 23, namely at the front and the back of the pre-carding impurity removal roller 4, and the dust removing knife 5 is arranged at the end part of the pre-carding impurity removal roller front cover plate 6 close to the pre-carding impurity removal roller 4, so that the sealing property of the carding area of the main cylinder is ensured, and the impurity removal capability is further improved.

The pre-carding impurity removing roller 4 performs rotary motion at the speed of less than 1m/min, and the direction is opposite to the rotary direction of the main cylinder 23. The roller surface is coated with the impurity removing roller elastic card clothing 7 which is the same as the rotary cover plate 22, the distance between the roller body of the pre-carding impurity removing roller 4 and the main cylinder 23 is set to be 0.4-0.5 mm, is larger than the distance between the inlet of the rotary cover plate 22 and the main cylinder 23, and is smaller than the distance between the last group of rear fixed cover plates 1 adjacent to each other and the main cylinder 23. The aim is that the pre-carding impurity removing roller 4 can be matched with the main cylinder 23 to further comb the fibers carded by the rear fixed cover plate, decompose the fibers into smaller fiber bundles, and then the smaller fiber bundles are brought into the carding area of the rotary cover plate by the main cylinder 23 rotating at a high speed. Meanwhile, due to the action of centrifugal force when the main cylinder rotates at high speed, a plurality of large short fibers, impurities and neps can be sprayed into the card clothing gaps of the pre-carding and impurity removing roller and are transferred to the upper part along with the rotation of the pre-carding and impurity removing roller; the cleaning roller 9 positioned above the pre-carding impurity removing roller 4 rotates at a high speed of about 400-500 m/min, the roller surface is coated with a cleaning roller card clothing 10, and short fibers, impurities and neps carried on the impurity removing roller elastic card clothing 7 are cleaned. The cleaning roller 9 sends short fiber, foreign matters and neps into the cover plate air suction port 15 (see fig. 4) by using the centrifugal force generated by the self at high speed in cooperation with the air suction duct.

The power device responsible for the pre-carding impurity removing roller 4 and the cleaning roller 9 is respectively driven by the original cover plate gear shaft 20 and the original cover plate cleaning motor 30, and a new motor is not required to be added, as shown in fig. 3. The shaft end of the cover plate gear shaft 20 is lengthened, a driving synchronous belt wheel 33 is arranged at the shaft end, and the pre-carding impurity removal roller 4 is driven to rotate by driving a driven synchronous belt wheel 26 on the pre-carding impurity removal roller 4. The cleaning roller 9 in the pre-carding and impurity removing mechanism is provided with a driven synchronous pulley 27 at the shaft end and is driven by a driving pulley 32 on the original cover plate cleaning motor 30.