This application relates to mechanisms for primary processing of cotton, and more particularly to a device and a method for transferring a cotton fiber, and a device for removing an impurity in the cotton fiber.
Currently, saw ginning devices and saw delinting devices are main devices for primary processing of cotton, and their functions are described as follows.
For example, Chinese patent No. 203668559U discloses a saw ginning device including a saw blade roller and a brush roller. The saw blade roller pulls the cotton fiber to pass through a rib gap between to filter the cotton seed, and then the cotton fiber on the saw blade roller is brushed off by the brush roller and transported out of the saw ginning machine. The surface of the cotton seed processed by the ginning machine is still attached with dense linters, which account for about 6.7% by weight of the lint and are an important fiber source. At present, ginning factories usually carry out the mechanical delintion using a saw delinting device, such as a double-layer saw delinting device disclosed by Chinese patent No. 2009819000. The double-layer saw delinting device includes a saw blade roller and a brush roller. The linters on the cotton seed is delinted through the saw blade roller in a working box, and then the linters on the saw blade roller are brushed off and transported out of the device through the brush roller.
As shown in
Since the friction coefficient between the brush and the cotton fiber is 0.35-0.4, which is close to the friction coefficient 0.3 between the saw blade and the cotton fiber, and thus a saw blade roller 700 and a brush roller 100 are arranged in a contact brushing manner. A brush 101 of the saw blade roller extends into the brush roller by 1-3 mm to facilitate the separation and transfer of the cotton fiber on the licker-in roller. However, the brush forcibly separates the cotton fiber on the saw blade, and the impurities that have been exposed on the saw blade roller will be recombined with the cotton fiber, which makes it difficult to separate the impurities from the cotton fiber. In addition, a distance between adjacent rolls of brushes is about 30 mm, which may cause the instantaneous accumulation of the cotton fiber in the gap between the brushes during the high-speed transfer process of the cotton fiber, hindering the separation of impurities. In the contact brushing manner, to avoid the fire caused by friction, the saw blade roller used herein almost has no gripping force on the cotton fiber and only provides a centrifugal force, leading to a low removing rate of the impurity. The discharged impurities are easy to carry effective fibers, causing loss of clothing fiber. In addition, the service time of the brush is short due to the longtime friction.
Currently, the non-contact brushing manner has not been used for transferring cotton fiber from the roller with the toothed brush.
The existing saw ginning device and saw delinting device may have the following problems.
1. The efficiency for removing impurities is low, leading to a cost for adding an impurity-removing device. The cotton fiber processed by the existing saw ginning device and saw delinting device fails to meet the requirements of downstream users. According to the technical requirement GB/T19819-2005 of the saw ginning device and the technical requirement GB/T21306-2007 of the saw delinting device, a clear standard for the removing rate of the impurity in the cotton fiber is not put forward in the main performance of the device, which means the impurity-removing performance of the existing saw ginning device and saw delinting device is undesirable. To satisfied the downstream users, the lint processed by the existing saw ginning device needs to be further processed by a special lint cleaning device, such as GB/T 21208-2007; and the linters processed by the saw delinting device also need to be further processed a special linters cleaning device, such as GH/T1023-2000. Those cleaning devices largely increase the cost, such as the purchase cost, installation coast and maintaining cost.
2. The existing saw ginning device and saw delinting device may cause large noise and serious air pollution, and require a dust-removing device. The saw ginning device and saw delinting device both include a saw blade roller and a rush roller. The brush roller is an important part in these devices, and is mainly configured to brush the processed cotton fiber and transfer out the cotton fiber from the devices. Generally, a rotation speed of the brush roller is larger than 1000 rpm to totally clean and transfer the cotton fiber from the saw blade roller. However, air flow caused by the high-speed rotation of the brush roller will lead to severely friction with the surrounding mechanical components, generating a large noise. According to the technical requirement GB/T19819-2005 of the saw ginning device and the technical requirement GB/T21306-2007 of the saw delinting device, a no-load noise of the saw ginning device should not be greater than 90 dB(A) and a no-load noise of the saw delinting device should not be greater than 85 dB(A)”. In addition, the high-speed rotation of the brush roller will blow up the dust on the cotton fiber. The brush roller sucks in a large amount of clean air, but discharges similarly sized dust-containing gas, causing serious air pollution. Therefore, an additional facility such as dust-removing pipeline, dust-removing fan and dust-removing tower with a processing capacity of about 6000 m3/h is required for each saw ginning device and saw delinting device, resulting in the increase in the construction cost and energy consumption of the production line.
Therefore, the existing saw ginning device and saw delinting device that include a saw blade roller and a brush roller face the problems of low impurity-removing efficiency, large noise pollution and air pollution, and need to be improved.
To solve the large noise pollution and air pollution caused by the saw ginning device and saw delinting device mentioned above, the present disclosure provides a device and a method for transferring a cotton fiber, and a device for removing an impurity in the cotton fiber. The brush roller mentioned above is replaced by a licker-in roller, and the contact brushing manner is changed to a non-contact brushing manner to reduce the abrasion of the roller, so as to effectively remove the impurity and reduce the noise pollution and air pollution.
The technical solutions of the present disclosure are described as follows.
In a first aspect, the present disclosure provides a device for transferring a cotton fiber, comprising:
In a preferred embodiment, the saw blade roller is provided with a plurality of saw blades, an outer circumference of the plurality of saw blades is provided with teeth; two opposite side walls of the plurality of saw blades are respectively provided with a rib; the saw blade roller is configured to hook and pull the cotton fiber from between the ribs to form an initial floating layer with a thickness of Lm× sin t, wherein Lm is a length of the cotton fiber; ti is an angle between the cotton fiber and a tangent of the saw blade roller at an intersection of the hooked cotton fiber and the saw blade roller; t=θ=40±4°; θ is an angle between an entrance side of the teeth of the saw blade roller and a normal plane of the teeth passing a top of the teeth.
In a preferred embodiment, a licker-in wire layer is evenly wound on an outer circumference of the licker-in roller; a gap between the first cover plate and the licker-in wire layer is no larger than 5 mm, preferably 0.2 to 3 mm; and a gap between the windscreen plate and the licker-in wire layer is no larger than 5 mm, preferably 0.2 to 3 mm.
In a preferred embodiment, an end of the first cover plate close to the saw blade roller is a starting end; and a distance from the starting end to the saw blade roller is larger than a thickness of the initial floating layer; a distance from the starting end to a line between a center of the saw blade roller and a center of the licker-in roller is larger than half of a length S of a common chord of a virtual circumference of the initial floating layer and a circumference of the licker-in roller; a ratio of the linear speed of the licker-in roller to the linear speed of the saw blade roller is no less than
ε is an inclination coefficient of the cotton fiber; and ε is selected from 0.8-1.
In a preferred embodiment, an arc M of the surface of the saw blade roller between the rib of the saw blade roller and an end of the first cover plate close to the saw blade roller is 42°-180°.
In a preferred embodiment, the saw blade roller is provided with a plurality of second cover plates spaced apart; an end of each of the plurality of second cover plates is connected to the first cover plate; an arc M of the surface of the saw blade roller covered by each of the plurality of second cover plates is 42-180°; a distance between an end of each of the plurality of second cover plates close to the first cover plate and the surface of the saw blade roller is larger than 21 mm; and a distance between an end of each of the plurality of second cover plates away from the first cover plate and the surface of the saw blade roller is 3-10 mm.
In an embodiment, the number N of rotations of the cotton fiber rotating with the saw blade roller under the plurality of second cover plates is larger than (M)/(2Πrj), wherein rj is a radius of the saw blade roller; a thickness B of the cotton-fiber floating layer is calculated according to a critical diameter formula of a cyclone separator as follows:
wherein w is a rotating speed of the saw blade roller, dc is a diameter of the cotton fiber, ρs is a proportion of the cotton fiber in the cotton-fiber floating layer; and μ is a fluid viscosity of the air; and Π is Pi.
In an embodiment, a length S of a chord of the licker-in roller intersecting with the initial floating layer or the cotton-fiber floating layer under of the plurality of second cover plates is calculated as follows:
in which B is the thickness of the initial cotton-fiber floating layer; Rc is a radius of the licker-in roller; rj is a radius of the saw blade roller; and x is the distance between the surface of the barbed roller and the saw blade roller.
In a second aspect, device for removing an impurity in a cotton-fiber, comprising
In an embodiment, the cotton-fiber support plate is provided with an air compensation port.
In an embodiment, an angle between a line connecting an end of the impurity-removing plate close to the saw blade roller to a center of the licker-in roller and a line connecting the center of the licker-in roller to a center of the saw blade roller is 20-60°; and a distance between an upper end of the impurity-removing plate and the licker-in roller is 15-45 mm.
In a third aspect, the present disclosure provides a method for transferring a cotton fiber using the device for transferring a cotton fiber, comprising:
Lm is a length of the cotton fiber; S is larger than 2εLm; ε is the inclination coefficient of cotton fiber; and ε is 0.8-1.
A mechanism for transferring a cotton fiber using the device provided herein is described as follows.
Internal reference materials show that the seed cotton moves with teeth towards a rib, and immediately changes the direction and speed of movement when hitting the rib. The seed cotton then moves upwards along a surface of the rib. The speed of the seed cotton at the working point of the seed cotton roll is the slowest, and is about 1.1-1.5 m/s. When the seed cotton is at the working point of the rib, the moment that the teeth pulls the fiber from the cotton seed, a running force Fp of a saw blade can be decomposed into two mutually perpendicular forces Fr and Ft. A direction of the Fp is consistent with a traveling direction of the teeth at a working point, and is perpendicular to a radial direction of the saw blade. The Fr is perpendicular to the rib, and is a force for the teeth at a working point of the rib to pull out a cotton fiber from the cotton seed. A direction of the Ft is parallel to the rib, and is a force for the teeth at the working point of the rib to drive a roll of the seed cotton to run. An angle between a tangent of the rib 702 at the working point and a tangent (Fp direction) of the saw blade 701 is a pressure angle. The pressure angle increases when the teeth 7011 pass through the working point of the rib 702, which reducing an effect on the roll of the seed cotton to run upwards along a tangent function of the rib 702. Since the roll of the seed cotton runs upwards along the tangent direction of the rib, an angle σ between the cotton fiber and a normal plane of the teeth 7011 passing through a top of the teeth 7011 is less than 90°, and a maximum value of an angle δ between the cotton fiber and an entrance side 70111 of a tooth is 90°. Referring to
The saw blade roller is installed with saw blades with a centripetal angle, the teeth are provided on the circumference of the saw blade. The angle between the entrance side of the teeth and the normal plane passing the top of the teeth is θ=40°±4°, so that the maximum value of the included angle between the cotton fiber and the circumferential tangent of the saw blade is θ, that is, when the speed of the saw blade roller is extremely low or the side of the saw blade roller close to the barbed roller is a relatively negative pressure zone, when the cotton fiber rotates with the saw blade without facing air resistance, the fiber remains in the state when it is completely pulled off from the rib, σ=90°−θ, the thickness of the cotton-fiber floating layer is Lm×sin θ=13.51-20.84 mm, and Lm is the length of the cotton fiber, with a value of 23-30 mm.
Since the distance x between the saw blade roller and the licker-in roller is preferably 0.5 mm, the virtual circle of the cotton-fiber floating layers formed on the saw blade roller intersects with the circumference of the licker-in roller and shares the chord length S, that is, the cotton brushing area. The thickness B of the cotton-fiber floating layer and the radius Rc of the licker-in roller are variables. According to the two circles with known radius and center distance, find the chord length S shared by the two circles. The radius Rc of the licker-in roller is 125-310.5 mm.
Z1 and Z2 are divided by the chord shared by the two circles, the length of each section connecting the centers of the two circles, and x is the surface distance between the saw blade roller and the licker-in roller.
The cotton fiber leaves the rib with the saw blade roller. When the linear speed of the saw blade roller is lower than 1.5 m/s, the thickness B of the cotton-fiber floating layer is 13.51-20.84 mm; when the linear speed of the saw blade roller exceeds the speed of 1.5 m/s, the cotton fiber is also subject to wind resistance, and the centrifugal force exerted by the saw blade roller on the cotton fiber.
The thickness of the cotton-fiber floating layer theoretically formed under the action of centrifugal force when the cotton fiber rotates with the saw blade roller at a high speed in the present disclosure:
According to the critical diameter formula of the cyclone separator,
the cotton fiber is equivalent to the separated particles, the diameter of a cotton fiber is dc=15 μm, the average length of the cotton fiber is 28 mm, and the volume of the cotton fiber: 3.14*0.015 mm*0.015 mm*28=0.019782 mm3, the specific gravity of cotton fiber ρs is 1.5 g/cm3, μ=0.0186 mPa*s at 30° C., the number of rotations N of the cotton fiber on the surface of the saw blade roller is greater than (M)/(2Πrj, the radius of the saw blade roller is rj, w is the speed of the saw blade roller, ui is the tangential speed of particles and gas in the cyclone separator, which is equivalent to the linear speed of the cotton fiber as it rotates with the saw blade roller, ui=2Πrjw, B is the maximum thickness of the airflow through the particle settling process, which is equivalent to the thickness of the cotton-fiber floating layer,
According to the installation experience, the arc from the rib of the saw blade roller to the second cover plate of the licker-in roller is 42°-180°, and the diameter of the existing saw blade roller is 320 mm. N>(M)/(2Πrj), assuming that the cotton fiber is initially attached to the surface of the saw blade roller, the thickness B of the cotton-fiber floating layer produced when the saw blade roller rotates is shown in Table 1. The distance between the end of the second cover plate of the licker-in roller close to the saw blade roller and the surface of the saw blade roller is greater than the thickness B of the cotton-fiber floating layers.
The centrifugal force exerted by the rotation of the saw blade roller on the cotton fiber offsets the resistance of the cotton fiber to the wind. The higher the speed, the longer the number of rotations, the more significant the offsetting effect. At the same time, laminar flow is formed on the surface of the licker-in roller when it rotates, and the distance between the second cover plate of the licker-in roller and the licker-in roller is extremely small, the laminar flow from the seed cotton fiber outlet channel is extremely small, when the licker-in roller rotates, downward airflow is generated below the intersection of the licker-in roller and the saw blade roller, so that the brush surface area above the intersection of the licker-in roller and the saw blade roller forms a low pressure zone or relative to the negative pressure zone, the resistance of the cotton fiber to the wind is further reduced, and the cotton fiber floating layer can maintain the thickness of the floating layer of the barbed roller when pulled off from the rib. Especially when the saw blade roller is close to the side of the licker-in roller and the ribs cover the saw blade rear cover plate, a vacuum zone is formed under the saw blade rear cover plate, and the cotton fiber is not subject to air resistance.
The principle of transferring and conveying the cotton fiber from the saw blade roller by the licker-in roller of the device provided herein is described as follows.
The cotton fiber separated by the saw blade roller rotates with the saw blade roller to form a cotton-fiber floating layer, the intersection of the licker-in roller and the cotton-fiber floating layers forms a cotton-brushing area. When the cotton fiber rotates to the cotton brushing area, the linear speed of the licker-in roller is higher. The friction between the second layer and the cotton fiber is greater than the friction between the brush and the cotton fiber, and the cotton fiber is hooked and pulled straight by the licker-in wire layer on the surface of the licker-in roller in the cotton brushing area;
When the end of the cotton fiber away from the saw blade moves in the cotton brushing area for a time equal to or less than the time required for the hanging point of the cotton fiber and the saw blade to move with the saw blade to the arc length that passes when it leaves the saw blade, the linear speed ratio of the licker-in roller to the saw blade roller is enough to transfer all the cotton fibers on the saw blade to the licker-in roller, and without back cotton in this state. At the same time, it is required that the chord length S of the cotton brushing area corresponding to the licker-in roller is greater than twice the length of the cotton fiber. If S is less than 2Lm, it means that when the cotton fiber leaves the saw blade roller, there is a non-negligible angle between the movement direction of the cotton fiber on the licker-in roller and the movement direction of the cotton fiber on the saw blade roller, causing the two ends of the cotton fiber are respectively hooked and pulled by the saw blade and the licker-in roller, causing difficulty in separation. Because the cotton fiber is not perpendicular to the center line of the saw blade roller and the barbed roller when it is just hooked by the licker-in roller during the transfer from the saw blade roller to the licker-in roller, and when it leaves the saw blade roller, the cotton fiber and the vertical line of the center line of the saw blade roller and the licker-in roller has an included angle φ, therefore, when the chord length S of the actual cotton brushing area corresponding to the licker-in roller is greater than twice the product of the cotton fiber length and the cotton fiber inclination coefficient c, the cotton fiber can still be completely transferred. Therefore, in the present disclosure, when S is greater than 2εLm, it means that the cotton fiber can be transferred. When ε is 0.8-1, εLm represents Lm cos φ.
The chord S in the intersecting area of the circular cotton-fiber floating layer produced by the rotation of the saw blade roller and the licker-in roller is shown in Table 2. The chord length is approximately equal to the distance that the cotton fiber moves with the licker-in roller after being hooked by the licker-in roller.
When the value of s is 1, the ratio of the linear speed of the licker-in roller to the saw blade roller corresponding to the above chord length S is shown in Table 3.
When the value of ε is 0.8, the ratio of the linear speed of the licker-in roller to the saw blade roller corresponding to the above chord length S is shown in Table 4.
Preferably, the diameter dc of the saw blade roller is 320 mm, the rotating speed of the saw blade roller is greater than 300 rpm, the arc M of the saw blade roller rotating with the cotton fiber is 92°-180°, and the radius of the licker-in roller Rc is greater than that of the saw blade roller, and when the thickness B of the cotton-fiber floating layer is greater than 13.54 mm, the licker-in roller and the saw blade roller are driven to rotate by the geared motor at a linear speed ratio of S:S−2εLm, in which Lm is a length of the cotton fiber; ε is an inclination coefficient of the cotton fiber; ε is 0.8-1; and S is a length of a common chord length of after the intersection of the cotton fiber floating layer and the licker-in roller corresponding to the licker-in roller, which is equal to
in which x is 0.6-1 mm.
The cotton fiber transferred to move with the licker-in roller, under the action of the rotating centrifugal force of the licker-in roller, leaves the licker-in roller, and is supported by the movable impurity-removing plate and the cotton-fiber support plate arranged at the lower part of the licker-in roller, and is blocked by the windscreen plate. The cotton fiber is ejected from the cotton fiber outlet through the machine body under the action of centrifugal force and centrifugal inertia force.
The technical scheme of the present disclosure realizes 100% transfer of cotton fibers on the saw blade roller to the licker-in roller for the first time. So that the non-contact ginning machine has the conditions for industrial application.
The principle of the device provided herein for reducing working noise and reducing working dust is described as follows.
The height of the licker-in wire layer is much smaller than the height of the brush, so that the air volume passing through the second cover plate of the licker-in roller when the licker-in roller rotates is much smaller than that of the brush roller, which greatly reduces the dust volume; and the airflow passing through the second cover plate of the licker-in roller is reduced, the airflow speed is reduced, so that the airflow speed is much lower than the surface linear speed of the licker-in roller, preventing the airflow from cutting the card wire to produce noise.
In the drawings, 100, brush roller; 101. brush; 110. brush bundle; 120. brush root; 130. cover plate; 102. shell;
200. licker-in roller; 401. impurity-removing plate; 402. second cover plate; 4021. starting end; 403. windscreen plate; 404. cotton-fiber support plate; 405. guide plate; 406. exit channel; 407. shell; 408. licker-in wire layer; 409. cover plate; 410. air compensation port; 411. cylindrical cavity; 412. first window; 413. second window; 414. cotton-brushing area; 415. box plate; 700. saw blade roller; 701. saw blade; 7011. teeth; 70111. entrance side; and 702. rib.
The technical solutions of the prior art and the present disclosure will be further described below with reference to the accompanying drawing.
Referring to
In an embodiment, a saw blade roller 700 hooks out the cotton fiber from between ribs 702 to form an initial floating layer with a thickness of Lm×sin t, in which Lm is a length of the cotton fiber; t is an angle between the cotton fiber pulled out and a tangent of the saw blade roller 700 at an intersection of the cotton fiber and the saw blade roller 700; t=θ=40±4°; and θ is an angle between the entrance side 70111 of the tooth of the saw blade roller 700 and a normal plane of the teeth 7011 passing through the top of the teeth 7011. Specifically, when the saw blade roller 700 hooks out the cotton fiber of the seed cotton between the ribs 702 and the initial floating layer is just formed, the cotton fiber (the initial floating layer) is subjected to a centrifugal force when rotating with the saw blade roller 700, such that the thickness of the cotton fiber (the initial floating layer) gradually increases to form a cotton-fiber floating layer.
In an embodiment, the cotton fiber transfer device may be, but is not limited to, applied to a saw ginning machine, a saw delinting machine and a saw lint cleaner.
As shown in
As shown in
An air quantity generated by the brush roller 100 per minute during working is calculated as follows:
Air quantity Q3=V*S/T
in which, V is a volume of the brush roller 100 suffering from the air; S is a rotation speed; and T is a working time.
Therefore, the air quantity generated by the brush roller 100 per hour is about 2865.05 m3. A gap between a windscreen plate 403 and a top of the brush of the brush roller 100 is generally required to be set at 3 mm. Then, an area of an upper air inlet of the brush roller 100 is only 0.0042 m2, which is calculated by the equation: 1.4 m*0.003 m=0.0042 m2; and the air quantity generated by the brush roller 100 is 0.796 m3/s. Theoretically, a wind speed v3 at the intersection should reach 0.796÷0.0042=189.4872 m/s, and a linear speed of the brush bundle 110 is 3.14*(0.155+0.025+0.025)*2*1010÷60=21.671 m/s. The linear speed of the brush bundle 110 is less than the airflow speed 189.4872 m/s required by an air inlet of a gap with a width of 1-3 mm between the brush bundle 110 and the windscreen plate 403. After being blocked by the rear windshield 403 and the brush bundle 110, the air flow vibrate the brush bundle 110 and the brush root 120 to generate noise, and the airflow forms a negative pressure or even a vacuum at a cover plate 130 of the brush. The huge air pressure difference and wind speed will inevitably cause violent friction with the windscreen plate 403 at the air inlet of the gap with the width of 1-3 mm, resulting in huge howling noise.
According to the Bernoulli equation, an equation can be obtained as follows:
P
3
+ρgh+½ρv32=P0+ρgh+½ρv02.
In an embodiment, an impurity-removing plate 401 is provided on a side of the cotton-fiber support plate 404 close to the saw blade roller 700.
As shown in
ΔP′=P3−P0=−½ρv32=−710.893 Pa. That is, and air pressure between the left end of the impurity-removing plate 401 and the brush bundle 110 is negative pressure, which is very different from the atmospheric pressure on a side of the saw blade roller 700. An air pressure difference generates a suction force to the cotton fiber towards a side of the channel between the impurity-removing plate 401 and the brush roller 100, such that the cotton fiber is sucked into the channel between the impurity-removing plate 401 and the brush roller 100. A wind speed in the channel between the impurity-removing plate 401 and the brush roller 100 is greater than the linear speed of the brush bundle 110. Impurities such as infertile seeds, leaf crumbs, cottonseed hulls, cottonseed covers on a surface of the brush roller 100 are sucked into the channel between the impurity-removing plate 401 and the brush roller 100 before being layered. The impurity-removing plate 401 can block the impurities with a larger particle size that the impurities larger than a width of the channel between the impurity-removing plate 401 and the brush roller 100 are blocked. Since the wind speed is greater than the linear speed of the brush bundle 110, the cotton fiber moves forwards faster than the brush bundle 110 and is blocked between the brushes 101 of two adjacent brush bundles 110. As a result, the holding power of the brush bundle 110 on the cotton fiber is further reduced, and the cotton fiber is also lost, reducing the clothing content, that is, a weight percent the cotton fiber in the seed cotton.
As shown in
As shown in
As shown in
As shown in
As shown in
In an embodiment, the cotton fiber transfer device further includes the shell 407 of the licker-in roller 200. The shell 407 of the licker-in roller 200 covers the licker-in roller 200, and the licker-in wire layer 408 is evenly wound around on a surface the shell 407 along a circumference direction. The licker-in wire layer 408 includes a 109-type card wire and card clothing.
As shown in
As shown in
Referring to
1. Analysis of a Producing Area of the Cotton-Fiber Floating Layer in the Cotton-Brushing Area According to an Air Flow Field Generated During an Operation of the Licker-in Roller 200,
Air quantity Q2=V*S/T*1.4 m;
in which, V is a volume of the licker-in roller 200 suffering from the air; S is a rotation speed; and T is a working time.
The volume of the licker-in roller 200 suffering from the air V1=[3.14*(0.2+0.003) m*(0.2+0.003) m*1.4 m−3.14*0.2 m*0.2 m*1.4 m]*60%=0.003189 m3.
Air quantity Q2=0.003189 m3*1440/min=4.592 m3/min=0.0797 m3/s.
Therefore, the air quantity generated by the licker-in roller 200 per hour is about 286.9973 m3. A gap between a surface profile of the card wire and the windscreen plate 403 is set to 3 mm, and an area of an air inlet formed by the gap between the surface profile of the card wire and the windscreen plate 403 is 1.4 m*0.003 m=0.0042 m2. The air quantity generated by the licker-in roller 200 is 0.0797 m3/s. Theoretically, a wind speed v1 between the first cover plate 402 and the licker-in roller 200, at the air inlet, and at an air outlet reaches 0.0797÷0.0042=18.981 m/s. An air flow that moves from the air inlet to the air outlet for brushing the cotton fiber is formed. The first cover plate 402 is connected to the third cover plate 409 and the exit channel 406, and the exit channel 406 is under a negative pressure; therefore, when the licker-in roller 200 rotates, the air cannot be exhausted from the exit channel 406 to the saw blade roller 700, and a negative pressure zone will be formed at the saw blade roller 700.
According to the Bernoulli equation, the following equation can be obtained:
P
1
+ρgh+½ρv12=P0+ρgh+½ρv02.
Referring to
2. Analysis of an Impurity-Removing Effect According to an Installation Position of the Impurity-Removing Plate 401
Referring to
in which w is a rotating speed of the saw blade roller 700; dc is a diameter of the cotton fiber; ρs is a proportion of the cotton fiber in the cotton-fiber floating layer r; and μ is a fluid viscosity of air; and Π is Pi.
The thicknesses of the cotton-fiber floating layers transferred to the licker-in roller 200 and rotating for 0.111, 0.139 or 0.167 turn are 21 mm, 27 mm and 32 mm, respective. Since the density and diameter of the impurities are much larger than the cotton fiber, thicknesses of impurity floating layers formed by the impurities transferred to the licker-in roller 200 and rotating for 0.111, 0.139, or 0.167 are much greater than those of the cotton-fiber floating layer. When a width of the gap between the impurity-removing plate 401 and the surface of the licker-in roller 200 is 21, 28 or 33 mm, the cotton fiber can be blocked between the impurity-removing plate 401 and the licker-in roller 200, so as to separate the impurity from the cotton fiber. The thickness of the cotton-fiber floating layers is smaller than the width of the gap between the impurity-removing plate 401 and the licker-in roller 200, and the impurity-removing plate 401 does not damage the cotton fiber. Since the density and particle size of the impurity in the cotton fiber are much larger than those of the cotton fiber, when rotating with the licker-in roller 200, the impurity generates a centrifugal thickness greater than the thickness of the cotton-fiber floating layer. The centrifugal thickness of the impurity is larger than the width of the gap between the impurity-removing plate 401 and the licker-in roller 200, such that the impurity can be discharged by the impurity-removing plate 401.
3. Analysis of a Mechanism for the Cotton Fiber to be Transferred from the Saw Blade Roller 700 to the Licker-in Roller 200
As shown in
As shown in
4. Checking Calculation the Characteristics for Transferring the Cotton Fiber
The size of the licker-in roller 200, the size of the saw blade roller 700, and the rotation speed of the saw blade roller 700 in this example are similar to those in Comparative Example 1. An arc of the saw blade roller 700 covered by the third cover plate 409 in this example is 62°. The thickness B of the cotton-fiber floating layer is calculated according to Table 1.
A diameter of one cotton fiber: dc=15 μm; a length of one cotton fiber: 28 mm; a volume of one cotton fiber: 3.14*0.015 mm*0.015 mm*28=0.019782 mm3; a specific density ρs of the cotton fiber: 1.5 g/cm3; at 30° C., μ=0.0186 mPa*s. w is a rotation speed of the saw blade roller 700, and ui is a tangential velocity of a particle and gas in a cyclone separator, and is equivalent to a linear speed of the cotton fiber when the cotton fiber rotates with the saw blade roller 700. ui is equal to 2Πrjw.
Table 5 shows the number of rotations that cotton fiber rotates with the centrifugal movement of the saw blade roller 700 until it is thrown on the surface of the licker-in roller 200, and the number of rotations is 62° in this example. A distance between the surface of the licker-in roller 200 and the surface of the saw blade roller 700 is 0.6 mm. The thickness of the cotton-fiber floating layer on the saw blade roller 700 is 9.13 mm. It can be seen from Table 1 that the corresponding thickness 9.13 mm of the cotton-fiber floating layer is smaller than 21 mm, and the cotton-fiber floating layer will not touch the first cover plate 402. The length S of the common chord of the intersecting area (cotton brushing area 414) of the cotton-fiber floating layer and the licker-in roller 200 is no less than 78.88 mm in Table 2.
in which B is a thickness of the initial floating layer; Rc is a radius of the licker-in roller 200; rj is a radius of the saw blade roller 700, x is the distance between the surface of the licker-in roller 200 and the surface of the saw blade roller 700. When the length S is 78.88 mm, according to S=78.88 mm=2(hs+εLm), it can be calculated: hs=11.44 mm. In addition, vb:va=3.65>3.45:1, the high line speed ratio makes the cotton fiber always be in a straight state during transfer, reducing the twisting and knotting of cotton fiber. When the arc of the saw blade roller 700 covered by the third cover plate 409 is larger than 62°, the licker-in roller 200 provided herein can completely transfer of the cotton fiber from the saw blade roller 700 at the same rotation speed.
The linear speed of the card wire on the surface of the licker-in roller 200: 3.14*(0.2+0.003)*2*1500÷60=31.87 m/s; and the linear speed of the surface of the licker-in roller 200: 3.14*(0.2)*2*1440÷60=31.4 m/s. That is, the linear speed of the licker-in roller 200 and the line speed of the card wire on the surface of the licker-in roller 200 are both greater than the airflow speed of the air inlet, which is 3.322 m/s. Therefore, the card wire on the surface of the licker-in roller 200 will not vibrate under the high-speed cutting of the airflow, such that the noise will not be generated. In this way, the device provided herein works well in noise reducing.
As shown in
If an arc length from the left end of the third cover plate 409 to a connection line of a center of the licker-in roller 200 and a center of the saw blade roller 700 is 32°, it can be from Table 1 that a thickness of the corresponding cotton-fiber floating layer is 6.597 mm, which is less than 21 mm. Therefore, the cotton-fiber floating layer will not touch the first cover plate 402. As shown in Table 3, the corresponding chord length S is 68.18 mm. S=68.18 mm=2(hs+0.8Lm), (hs+0.8Lm)/hs=3.12>2.57, which means not all of the cotton fiber be pulled away in a straight line in time.
The test results show that a removing amount of the impurity removal is more than 50%. The linear speed ratio is smaller than 3.12, and the cotton fiber is kneaded into knots and cannot be transferred 100%.
As shown in
In an embodiment, the two side walls of the saw blade roller 700 are respectively provided with a rib 702, and the saw blade roller 700 can hook and pull cotton fibers from between the rib 702 to form a cotton-fiber floating layer.
In this example, when the value of 8 is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 62°, it can be seen in Table 1 that a thickness of the corresponding cotton-fiber floating layers theoretically formed under the action of centrifugal force is 7.12 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the barbed roller. As shown in Table 6-7, the corresponding chord length S is 68.83 mm. S=68.83 mm=2(hs+0.8Lm), (hs+0.8Lm)/hs=2.86<4.30 means that all cotton fibers can be pulled away in a straight line in time. When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 62°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is Lm×sin θ=13.51−20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.
Table 6 shows the supplementary calculation results of the chord S in the intersecting area of the circular cotton-fiber floating layer produced by the rotation of the saw blade roller 700 and the licker-in roller 200.
The linear speed ratio of the licker-in roller 200 to the saw blade roller 700 corresponding to the chord length S above is shown in Table 7.
Referring to
In this example, when the value of c is 0.8, an arc M between a rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to a surface of the saw blade roller 700 is 52°, it can be seen in Table 1 that a thickness of the cotton-fiber floating layers theoretically formed under the action of centrifugal force of the saw blade roller 700 is 7.65 mm<21 mm, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller. As shown in Table 6-7, the corresponding chord length S is 71.61 mm. S=71.61 mm=2(hs+0.8Lm), (hs+0.8Lm)/hs=2.67>2.639 means that all cotton fibers cannot be pulled away in a straight line in time.
If an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 62°, It can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force is 9.13 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 78.88 mm. S=78.88 mm=2(hs+0.8Lm), (hs+0.8Lm)/hs=2.31<2.6 means that all cotton fibers can be pulled away in a straight line in time. When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is greater than 62°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is Lm×sin θ=13.51-20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.
Referring to
In this example, when the value of ε is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 42°, it can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force of the saw blade roller 700 is 8.04 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 73.39 mm. S=73.39 mm=2(hs+0.8Lm) and (hs+0.8Lm)/hs=2.57<2.664 mean that all cotton fibers can be pulled away in a straight line in time.
When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 42°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is Lm×sin θ=13.51-20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.
Referring to
In this example, when the value of ε is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 72°, it can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force of the saw blade roller 700 is 14.31 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 109.59 mm. S=109.59 mm=2(hs+0.8Lm), (hs+0.8Lm)/hs=1.69<1.776 means that all cotton fibers can be pulled away in a straight line in time.
When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 72°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is Lm×sin θ=13.51-20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.
Referring to
In this example, when the value of c is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 58°, it can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force of the saw blade roller 700 is 13.32 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 105.44 mm. S=105.44 mm=2(hs+0.8Lm), (hs+0.8Lm)/hs=1.74<1.816 means that all cotton fibers can be pulled away in a straight line in time.
When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 58°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs, the thickness of the cotton-fiber floating layers is Lm×sin θ=13.51-20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.
Referring to
In this example, when the value of ε is 0.8, an arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700 corresponding to the surface of the saw blade roller 700 is 92°, it can be seen in Table 1 that the thickness of the cotton-fiber floating layers formed under the action of centrifugal force of the saw blade roller 700 is 13.54 mm, which is less than 21 mm from the left end of the first cover plate 402 of the licker-in roller 200 to the surface of the saw blade roller 700, it means that the cotton-fiber floating layer will not touch the first cover plate 402 of the licker-in roller 200. As shown in Table 6-7, the corresponding chord length S is 109.59 mm. S=109.59 mm=2(hs+0.8Lm), (hs+0.8Lm)/hs=1.73<1.76 means that all cotton fibers can be pulled away in a straight line in time.
When the arc M between the rib 702 of the saw blade roller 700 and the end of the first cover plate 402 of the licker-in roller 200 close to the saw blade roller 700, corresponding to the surface of the saw blade roller 700 is greater than 92°, the licker-in roller 200 of this example can realize the complete transfer of cotton fibers from the saw blade roller 700 at the same rotation speed. When the cotton fibers remain completely pulled off the ribs 702, the thickness of the cotton-fiber floating layers is Lm×sin θ=13.51−20.84 mm. The cotton-fiber floating layer can maintain this thickness under the centrifugal action of the saw blade 701. Actually, the condition of the returned cotton fiber is also monitored on the lower side of the saw blade roller 700. No cotton fiber is found to be entrained after the saw blade roller 700 rotated away from the cotton brushing area 414.
The principle of the high efficiency for the device provided herein to remove the impurity in the cotton fiber is described as follow.
Referring to
The embodiments provided herein are not intended to limit the scope of this disclosure, and modifications, replacements and improvements made by those skilled in the art within the spirit of the present disclosure should fall within the scope of the present disclosure defined by the appended claims. When the rotation speed of the saw blade roller 700 is 10 rpm, a ratio of the linear speed of the licker-in roller 200 to the linear speed of the saw blade roller 700 is greater than the values in Table 3, which means the cotton fiber can still be completely transferred. In addition, as shown in Table 3, the thickness of the cotton-fiber floating layer on the surface of the saw blade roller 700 is 13.51-20.84 mm.
Number | Date | Country | Kind |
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201911022232.6 | Oct 2019 | CN | national |
201921806459.5 | Oct 2019 | CN | national |
This application is continuation of International Patent Application No. PCT/CN2020/119174, filed on Sep. 30, 2020, which claims the benefit of priority from Chinese Patent Application Nos. 201911022232.6 and 201921806459.5, both filed on Oct. 25, 2019. The content of the aforementioned applications, including any intervening amendments thereto, is incorporated herein by reference in its entirety.
Number | Date | Country | |
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Parent | PCT/CN2020/119174 | Sep 2020 | US |
Child | 17507976 | US |