CN111334902A - Cotton fiber impurity removing structure - Google Patents

Abstract

The invention discloses a cotton fiber impurity removing structure which comprises a licker-in and a plurality of impurity removing knives, wherein the impurity removing knives are arranged on one side of the licker-in, the gap between the surface of a knife body on one side of each impurity removing knife, which faces the licker-in, and the surface of the licker-in is adjustable from 0.6mm to 6mm, comb teeth are densely distributed on one side of each impurity removing knife, which faces the licker-in, are spaced from the licker-in rack on the licker-in, the spacing h between the tips of the comb teeth and the rack of the licker-in is smaller than the spacing between the tips of the impurity removing knives and the rack of the licker-in, the spacing arc length of the adjacent impurity removing knives in the circumferential direction of the licker-in is not smaller than the length of cotton fibers, the comb teeth and the rack of the licker-in face opposite to each other, the rack front angle α of the comb teeth is-arcsin (h/c), the length of the cotton fibers is c, and the front angle β of the rack of the licker-.

Description

A cotton fiber impurity removal structure

technical field

The invention relates to the field of cotton primary processing machinery, in particular to a cotton fiber impurity removal structure.

Background technique

The existing cotton primary processing machinery, especially the lint cleaning machine, is mostly equipped with multiple impurities removal knives, such as patents: CN201722457U, CN201588010U, CN201362763Y, etc. The impurities removal knife is the key core component of the lint cleaning machine to remove impurities. Impurity removal efficiency. At present, the diameter of the barbed roller of the lint cleaning machine is getting larger and larger, and the number of installed impurities removal knives is increasing. Especially when the cleaning machine picks cotton, 2-3 lint cleaning machines are required. , the number of trash removal knives used is more, this lint cleaning machine and the method of using more trash removal knives for impurity removal have two obvious drawbacks:

Disadvantages 1. The impurity removal efficiency is low, and it is difficult to remove impurities such as fine cotton leaves, cotton stars, neps, and ropes: According to the technical requirements of lint cleaning machine GB/T21308-2007 4.2. The impurity content of the lint before cleaning is the base number): when the impurity content of the lint before cleaning is greater than 2.5%, the cleaning efficiency is not less than 40%", that is, the lint cleaned by the above-mentioned lint cleaning machine still contains about 60% of the impurities that are not cleaned. After cleaning, the quality of the gins can only reach the P3 value of the "Sawtooth Processing Fine Staple Cotton Quality Difference Table", and the price difference is reduced by about 200 yuan/ton. The content of impurities such as neps and ropes is higher. Such impurities are light in weight, small in size and mixed in the cotton fiber. The existing lint cleaning machine can hardly remove the impurities effectively only by the impact force of the impurity removal knife, resulting in The quality of the gins is worse and the spread on lint is even lower.

Disadvantage 2. The use of multiple lint cleaning machines, that is, the impact force of more impurity knives will aggravate further damage to cotton fibers. "Influence of Cotton Performance" records: "Every time the lint is cleaned, the main length of the fiber will decrease by 0.5mm, the length uniformity will decrease by 0.1-0.3%, and the breaking degree will decrease to 0.6-0.7cN/tex." Anqing Branch's report "Treat the impact of lint cleaning machines on the quality of lint cotton" caused damage to cotton fibers, and the short fibers increased by 40% compared with cotton fibers without lint cleaning; therefore, after two lint cleaning machines, only cotton fibers were cleaned. The length of the main body will decrease by 1mm. According to the "Sawtooth Processing Fine Staple Cotton Quality Difference Table", for every 1mm decrease in cotton fiber length, the price difference will decrease by -210 to -820 yuan / ton, resulting in a serious loss of cotton fiber value; in addition, The increase in the number of lint cleaning machines used will also cause the construction and operating costs of lint cleaning equipment to increase exponentially.

SUMMARY OF THE INVENTION

In order to solve the problem of low impurity removal efficiency of the current cotton primary processing mechanical impurity removal knife, the present invention provides a cotton fiber impurity removal structure.

The technical scheme adopted by the present invention:

A cotton fiber impurity removing structure, comprising: a licker-in roller, a plurality of impurity removing knives, the impurity removing knives are arranged on one side of the licker-in roller, the impurity removing knives face the side of the licker-in roller and the knife body and the thorn The gap on the surface of the roller is 0.6mm-6mm, and the side of each impurity removing knife facing the licker-in roller is densely covered with comb needle teeth, and all the comb needle teeth in any row or each row of comb needle teeth distributed along the axis of the licker-in roller. The distances to the surface of the licker-in are equal; the serrations of the comb needles are spaced apart from the licker-in rack on the licker-in, and the distance h is smaller than the distance between the butt end of the impurity removal knife and the licker-in rack, and the The distance between the blade edge of the impurity removing knife and the licker-in roller is not greater than the distance between the butt end of the knife and the licker-in roller, and the arc length of the interval between adjacent impurity removing knives in the circumferential direction of the licker-in roller is not less than the length of the cotton fiber. The rack faces are opposite, the rack rake angle α of the comb needle teeth is -arcsin(h/c)～arcsin(h/c)°, the cotton fiber length is c, and the licker-in rack rake angle of the licker-in β is arcsin(h/c)～36°.

Preferably, the distance between the blade edge end of the trash removing knife and the blade butt end opposite to the blade edge end from the surface of the licker-in roller is adjustable.

Preferably, the rack spacing of the comb needle teeth is smaller than the rack winding spacing of the licker-in rack.

Preferably, the comb needle serrations form an opening surface on the surface of the impurity removal knife, the length of the opening surface extending in the axial direction of the licker-in is greater than the axial length of the licker-in, and the width of the opening surface in the direction perpendicular to the axial direction of the licker-in is greater than The length of cotton fibers.

Preferably, the side of the impurity removing blade facing the licker-in roller forms an arc surface matching with the surface of the licker-in roller.

Preferably, a groove extending along the axial direction of the licker-in is provided on the side of the impurity removing blade facing the licker-in, and a comb needle plate densely covered with comb needle teeth is installed in the groove.

Further, the length of the cotton fiber is 10 to 30 mm, the height of the rack of the comb needle teeth is 0.6 to 1.5 mm, the rack front angle α of the comb needle teeth is -5 to 5°, and the licker-in roller The rake angle β of the licker-in rack is 10° to 36°.

The impurity removal process and beneficial effects of the present invention are as follows:

When the licker-in hook pulls the cotton fiber to the edge of the impurity removal blade, impurities such as infertile seeds and cottonseed hulls are mixed in the cotton fiber. The outer side of the cotton fiber layer of the licker-in is blocked by the front end of the licker-in knife, and the cotton fiber layer is discharged; The rake angle of the teeth, the pressure when feeding cotton, the arc length of the impurity removal blade distance from the cotton feeding point, etc. will all affect the gripping force and centrifugal force of the licker-in on the cotton fiber, so the gap between the blade of the impurity removal blade and the licker-in roller is preferred. It is set to 0.6-6mm; when the blade end of the impurity removal knife is close to the licker-in, it is used for impurity removal. When the butt end of the knife is far away from the licker-in, it is convenient for cotton fibers to rotate with the licker-in to separate impurities to the surface of the floating layer. The width of the upper carding surface along the rotation direction of the licker-in roller is not less than the length of the cotton fiber, that is, greater than the length of the cotton fiber after being pulled by the licker-in roller. In a straight line, it is convenient to separate impurities from cotton fibers, and to tear apart the neps and cords;

Some small impurities such as cotton leaves, cotton stars, etc., as well as some light impurities such as neps, ropes, etc., are attached to the cotton fiber layer due to their light weight or tight entanglement with cotton fibers, and are difficult to be removed by the front end of the trash removal knife. , with the hook of the licker-in roller into the curved surface of the side of the impurity removal knife facing the licker-in roller;

Since the length of cotton fiber is generally 10-30mm, after being pulled and rotated by the licker-in rack, the cotton fiber floating layer entering the gap between the licker-in knife and the licker-in roller is driven by the licker-in rack and the upper part of the licker-in knife is set The combing of the comb needle and rack makes each fiber straightened by carding. In this process, the fine impurities mixed on the cotton fiber by the centrifugal force reduce the adhesion of the cotton fiber and separate from the cotton fiber, and mix in the cotton fiber. The neps in the fibers are combed and torn apart to form effective cotton fibers, and the originally damaged cotton fibers can be recycled;

After carding, the cotton fibers leave the impurity removal knife with the movement of the licker-in. During the carding process, the fine impurities of the cotton fibers are separated out or fall into the pin rack on the impurity removal knife, and are pulled by the licker-in roller at a high speed. The rotating cotton fiber tail sweeps out the comb needle rack, and the cotton layer is discharged from the end of the impurity removing knife facing away from the blade;

During the carding process, some impurities are not completely separated from the cotton fibers, and because the adhesion with the cotton fibers is reduced during carding, after the cotton fiber layer leaves the impurity removal knife, it is affected by the centrifugal force of the licker-in and the wind generated by the licker-in. , was thrown out of the cotton fiber layer;

Before the carded cotton fibers are separated from the licker-in, install the next impurity removal knife according to the above method, and perform carding and cleaning on the cotton fibers again, and perform cleaning for many times.

The interval arc length of adjacent impurity removing knives in the circumferential direction of the licker-in roller is not less than the length of the cotton fiber, that is, greater than the length of the cotton fiber after being pulled by the licker-in roller. , Comb into a straight state, easy to separate impurities and cotton fibers, and easy to tear the neps and ropes apart;

Set the height of the comb needle teeth on the trash removal knife to 0.6-1.5mm, that is, the comb needle teeth are spaced apart from the licker-in rack on the licker-in, and the average value of the spacing is smaller than the distance between the surface of the knife body of the trash removal knife facing the licker-in. The average spacing of the licker-in rack, if the gap between the blade end of the impurity removal knife and the licker-in roller is 0.6mm, then the impurities in the cotton fiber and located in the outer layer of the rack roller with a single grain larger than 0.6mm will be removed by the impurity removal knife The blade end is discharged, and another part of the impurities is mixed in the inner layer of the licker-in rack of the licker-in roller (the height of the licker-in rack is about 2mm). The function of the inter-knife comb needle rack is to support, guide and comb the cotton fibers on the licker-in. Faster, the shorter the separation distance, the more the number of impurity removal knives installed. On the contrary, the smaller the gap between the butt end of the knife and the licker-in roller surface, the longer the separation distance of cotton fibers and impurities from the licker-in roller. The smaller the number.

Assuming that both ends of each cotton fiber are straightened by the needle teeth and the licker-in hook, the greater the distance between the needle teeth and the licker-in surface, the greater the angle between the straightened cotton fiber and the licker-in surface, and the closer The distance h between the teeth of the comb needle at the butt end and the licker-in roller is 4.5 to 5.4 mm, and the angle between each cotton fiber at the butt end that is straightened by the comb needle rack and the licker-in rack and the surface of the licker-in roller is arcsin (h/ c)=8.62°～32.68°, wherein c=10～30mm, preferably, the direction of the serrations of the comb needle and the rack of the licker-in are opposite, and the front angle of the serrations of the comb needle is -5°～5°, or plus or minus 5°, The rake angle of the licker-in rack is set to arcsin(h/c)～36°, the purpose is that when the rake angle of the needle teeth is greater than arcsin(h/c)°, the needle sawtooth exerts a direction toward the needle on the cotton fiber. The component force of the tooth root movement of the serrations will make a small number of cotton fibers detach from the licker-in rack, and the detached cotton fibers will accumulate on the serrations of the comb needles, which will cause cotton fibers to block. It will not be separated from the licker-in; and when the rake angle of the comb needle at the butt end is less than -arcsin(h/c)°, the needle sawtooth push the cotton fiber to the licker-in, and the cotton fiber is not easy to be straightened and combed, and mixed Small impurities between cotton fibers are not easily centrifuged.

The purpose of making the rake angle β of the licker-in rack to be arcsin (h/c) ~ 36° is to make the licker-in rack exert a component force on the cotton fibers that moves towards the root of the licker-in rack, and make this point The force is greater than the component force applied by the cotton fibers to the movement of the tooth roots of the comb needle teeth, so that the friction force of the comb needle teeth on the trash removal knife is smaller than the grip force of the licker-in rack on the cotton fibers, which further prevents the cotton fibers from clogging.

The tooth density of the comb needle is set to 30-100 teeth/25mm2, which is greater ^than the density of the licker-in rack, that is, the rack spacing of the comb needle teeth is smaller than the winding spacing of the licker-in rack; the purpose is to allow the licker-in to pull. The cotton fibers are evenly combed by the serrations of the comb needles on the trash removal knife.

One of the benefits of the present invention is that: on the premise of not increasing the kinetic energy consumption of the cotton preliminary processing machinery, the impurity removal efficiency of each impurity removal knife can be improved by more than 8%, and the impurity removal efficiency of each machine can be improved by more than 30%, especially For the small impurities that are difficult to be removed by the existing impurity removing knife, the present invention can greatly improve the impurity removal efficiency thereof;

The second advantage of the present invention is that: the present invention can open and recycle the neps and cables that are difficult to remove by the existing cotton primary processing machinery, and each scrap knife can reduce the content of neps and cables by more than 15%. It is invented that the cotton fibers after mechanical cleaning are basically free of neps and cords, and the cotton fibers are not damaged;

The third benefit of the present invention is that the appearance and shape of the cleaned cotton fibers, including the color and luster of the cotton fibers, are greatly improved, and the use value and economic value of the cotton fibers are improved.

Description of drawings

Fig. 1 is the structural representation of the cotton fiber impurity discharge structure of the present invention;

Fig. 2 is the enlarged schematic diagram of the impurity removing knife of the present invention;

Fig. 3 is the principle schematic diagram of straightening cotton fiber of the cotton fiber impurity removing structure of the present invention;

Fig. 4 is the principle schematic diagram of the straightening cotton fiber of the cotton fiber impurity removing structure of the present invention;

Figure 5 is a schematic structural diagram of the cotton fiber impurity-removing structure of the present invention.

Detailed ways

The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are only used for illustration and are not used to limit the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.

Example 1

As shown in Figures 1 and 2, a cotton fiber impurity removal structure includes: a licker-in 2, a plurality of impurity removal knives 1, the impurity removal knives 1 are arranged on one side of the licker-in roller 2, and each impurity removal knife 1 faces the licker-in roller The extension surface of one side of 2 is parallel to the surface of the licker-in 2, and the gap with the surface of the licker-in 2 is 5-6 mm, so that the impurity removing knife 1 does not damage the cotton fibers rotating with the licking-in roller 2; each impurity removing knife 1 faces One side of the licker-in 2 is densely covered with comb needle teeth 11, see Figure 3c, the comb needle teeth 11 are spaced apart from the licker-in rack 21 on the licker-in 2, and the distance h is smaller than the end distance of the butt 15 of the trash removal knife 1 The spacing between the licker-in racks 21, the arc length of the adjacent licker-in knives 1 in the circumferential direction of the licker-in 2 is not less than the length of the cotton fiber, preferably 40-80 mm, the comb needle serrations 11 form a combing surface on the surface of the licker-in knife 1 , the length of the opening surface extending in the axial direction of the licker-in 2 is greater than the axial length of the licker-in 2, and the width of the opening surface in the direction perpendicular to the axial direction of the licker-in 2 is greater than the length of the cotton fiber, such as 20-80mm. The needle teeth 11 and the licker-in rack 21 face oppositely. See Figure 3a to Figure 3c. The rack front angle α of the needle teeth 11 is -arcsin(h/c)～arcsin(h/c)°, and the cotton fiber length is c=10～30mm, the rake angle β of the licker-in rack 21 of the licker-in 2 is arcsin(h/c)～36°, and the rack density of the comb needle teeth is 30～100 teeth/25mm ² .

That is to say, when the two ends of the cotton fiber are pulled and straightened by the hooks of the licker-in rack 21 and the needle teeth 11, respectively, they receive a pulling force L of the same magnitude in opposite directions, and the cotton fiber is subjected to the normal pressure Nc in front of the teeth at one end of the licker-in rack 21. and centrifugal force U, the component force of the normal pressure Nc in front of the tooth is the opening force R, the value of the angle between the normal pressure Nc in front of the tooth and the opening force R is equal to the value of the rake angle β of the licker-in rack, the normal pressure in front of the tooth The component force of Nc in the normal direction of the licker-in is Ncsinβ, which is opposite to the direction of the centrifugal force U, which makes the cotton fiber move to the root of the licker-in rack.

The cotton fibers are subjected to the pressure Np before the toothed rack of the comb needles at one end of the needle teeth 11, and the pressure Np can be decomposed into a tensile force L along the cotton fiber direction and a component force fp perpendicular to the cotton fiber direction.

When the cotton fiber is straightened by the licker-in rack 21 and the needle teeth 11, the minimum included angle with the licker-in surface is arcsin(3.5/30)=6.69°;

As shown in Figure 3a, when the rack rake angle α of the needle teeth 11 is set to 0°, the component force fp of the pressure Np in the direction perpendicular to the cotton fiber faces the licker-in 2, and the cotton fibers will not be pulled away from the thorn by the needle teeth 11. The tooth root of the roller rack 21 will not be separated from the licker-in, but it can straighten the cotton fibers and centrifuge the fine impurities between the cotton fibers.

As shown in Figure 3b, when the rack front angle α of the needle teeth 11 is set to -5°, the component force fp of the pressure Np in the direction perpendicular to the cotton fiber is directed to the licker-in roller 2, and the cotton fibers will not be pulled away by the needle teeth 11. The tooth root of the licker-in rack 21 will not be separated from the licker-in, but it can straighten the cotton fibers and make the fine impurities between the cotton fibers centrifugal. The tension L becomes smaller, the cotton fibers are not easy to straighten, and the fine impurities between the cotton fibers are not easily exposed and centrifuged.

As shown in Figure 3c, when the rack front angle α of the needle teeth 11 is set to 5°, the pressure Np almost coincides with the longitudinal direction of the cotton fibers, no component force fp is generated, and the cotton fibers will not be pulled away by the needle teeth 11. The tooth root of the licker-in rack 21 will not be separated from the licker-in, and can better open and straighten the cotton fibers and centrifuge the fine impurities between the cotton fibers.

As shown in Fig. 4, when the rack front angle α of the needle teeth 11 is set to be greater than arcsin(h/c)°, the component force fp of the pressure Np in the direction perpendicular to the cotton fiber is directed to the needle teeth 11, and the cotton fibers will be blocked by the needle teeth. The hook of the serration 11 is pulled towards the tooth root of the comb needle, which will break part of the cotton fiber. If the rake angle β of the licker-in rack is less than arcsin(h/c)°, the normal pressure Nc in front of the teeth is in the licker-in method. The component force in the direction is that Ncsinβ will be less than fp, that is, the cotton fiber will be separated from the licker-in, resulting in the clogging of the cotton fiber.

As an embodiment, the impurity removing knife 1 forms an arc-shaped surface which is matched with the surface of the licker-in roll 2 toward the side of the licker-in roll 2 .

As an embodiment, a groove 12 extending along the axial direction of the licker-in 2 is provided on the side of the impurity removing knife 1 to the licker-in 2 , and the comb needle plate 13 densely covered with the comb needle teeth 11 is installed in the groove 12 .

The tensile force L=Rcos(arcsin(h/c)) of the cotton fiber, the smaller the arcsin(h/c)°, the greater the tensile force on the cotton fiber, the easier it is to overcome the elastic force between the cotton fibers and straighten, so it is necessary to discharge The miscellaneous knives 1 are arranged close to the licker-in rollers 2. If the mutual distance is more than 5mm, the knives of the miscellaneous knives can be used to remove impurities without damaging the cotton fibers. At the minimum value of arcsin(h/c)°, the diameter of the discharge is larger, but it does not hurt the cotton fiber.

In Example 1, the distance between the surface of the impurity removal knife 1 facing the licker-in roller 2 and the licker-in roller 2 can also be set to 0.8-2 mm, so that more cotton fibers are distributed on the tooth roots of the licker-in roller rack 21. At this time, impurities are removed. The diameter of the impurities that can be separated by the knife 1 is smaller.

Example 2

5 and 2, a cotton fiber impurity removal structure, comprising: 2 licker-in rollers, a plurality of impurity removal knives 1, the impurity removal knife 1 is arranged on one side of the licker-in roller 2, and the impurity removal knife 1 faces the licker-in roller 2 The gap between one side of the knife body and the surface of the licker-in can be adjusted from 0.6mm to 6mm, and the side of each impurity removal knife 1 facing the licker-in 2 is densely covered with comb needle teeth 11, and any one of them distributed along the axis of the licker-in 2 The distances from all the comb needle teeth 11 in a row to the surface of the licker-in 2 are equal, and the distance between the surface of the knife body between the blade edge 14 end and the butt 15 end of the miscellaneous removal knife 1 and the licker-in roll 2 is not greater than the distance from the knife butt to the licker-in roll 2 The distance, for example, is adjusted as follows, the blade end 14 is 0.6mm from the surface of the licker-in 2, the butt end 15 of the knife is 6mm from the surface of the licker-in 2, and the interval arc length of the adjacent impurity removing knives 1 in the circumferential direction of the licker-in 2 is not less than cotton The length of the fiber is set to 20mm, the needle teeth 11 and the licker-in rack 21 are facing opposite, and the rack front angle α of the needle teeth 11 is -arcsin(h/c)～arcsin(h/c)°, preferably 5 °The length of cotton fiber is c=20mm, and the front angle β of the licker-in rack 21 of the licker-in 2 is arcsin(h/c)～36°, preferably 10～36°, so the trash removing knife 1 of the embodiment 2 is compared with the embodiment 1 More can be installed to improve the efficiency of impurity removal. For example, in Example 1, when the surface of the impurity removing knife 1 is parallel to the surface of the licker-in roller 2, the rake angle α of the comb needle serrations 11 will not cause the problem of cotton blocking and poor opening effect. The inclination of Example 1 offsets the effect of the rake angle α of the serrations 11 of the combs making the cotton fibers on the licker-in 2 detached, and the problem of cotton clogging will not occur. The value is higher than that of Example 1, and the carding effect is better.

Claims (7)

1. a cotton fiber impurity removing structure, comprising: licker-in, a plurality of impurity removing knives, it is characterized in that, described impurity removing knife is arranged on one side of described licker-in, this impurity removing knife faces the side of licker-in roller The gap between the knife body and the surface of the licker-in is 0.6mm-6mm, the side of each impurity removal knife facing the licker-in roller is densely covered with comb needle teeth, and all the comb needle teeth in any row along the axis of the licker-in roller are distributed. Or the distances between the teeth of each row of comb needles and the surface of the licker-in are equal; the teeth of the comb needles are spaced apart from the licker-in racks on the licker-in, and the distance h is smaller than the distance between the butt end of the trash removal knife and the teeth of the licker-in. The distance between the strips, the distance between the blade end of the trash removal knife and the licker-in roller is not greater than the distance between the butt end of the knife and the licker-in roller, and the interval arc length of the adjacent trash removal knives in the circumferential direction of the licker-in roller is not less than the length of the cotton fiber. The direction of the needle teeth and the licker-in rack is opposite, the rack front angle α of the comb needle teeth is -arcsin(h/c)～arcsin(h/c)°, the cotton fiber length is c, and the licker-in The rake angle β of the licker-in rack is arcsin(h/c)～36°. 2 . The cotton fiber impurity removal structure according to claim 1 , wherein the distance between the blade edge end of the trash removal knife and the knife butt end opposite to the blade edge end from the surface of the licker-in roller is adjustable. 3 . 3 . The cotton fiber impurity removal structure according to claim 1 , wherein the rack spacing of the comb needle teeth is smaller than the rack winding spacing of the licker-in rack. 4 . 4. The cotton fiber impurity removal structure according to claim 1, wherein the comb needle serrations form a carding surface on the surface of the impurity removal knife, and the length of the opening surface extending in the axial direction of the licker-in is greater than the axial direction of the licker-in. Length, the width of the opening surface in the direction perpendicular to the axial direction of the licker-in is greater than the length of the cotton fibers. 5 . The cotton fiber impurity removing structure according to claim 1 , wherein the side of the impurity removing blade facing the licker-in roller forms an arc-shaped surface that matches the surface of the licker-in roller. 6 . 6 . The cotton fiber impurity removing structure according to claim 1 , wherein the side of the impurity removing blade facing the licker-in roller is provided with a groove extending in the axial direction of the licker-in roller, and the comb needles with comb needle teeth are densely covered. A plate is installed in the groove. 7. The cotton fiber impurity removal structure according to any one of claims 1 to 6, wherein the length of the cotton fiber is 10 to 30 mm, and the height of the rack of the needle teeth is 0.6 to 1.5 mm. The rack rake angle α of the comb needle teeth is -5-5°, and the licker-in rack rake angle β of the licker-in is 10-36°.

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