Control method for capacity increase of can of coiler of carding machine

Abstract

The invention relates to the technical field of textile machinery control, in particular to a control method for capacity increase of a can of a coiler of a carding machine. The method comprises the following steps: S1, setting initial parameters; S2, manufacturing a rotating speed table of a chassis rotating motor; s3, a chassis traversing motor pulse number table is manufactured; s4, positioning an initial position; s5, executing one-time traversing, namely acquiring the rotating speed of the chassis rotary motor corresponding to the traversing from the rotating speed table of the chassis rotary motor in sequence, and controlling the can to rotate for approximately one circle; meanwhile, the chassis traversing motor pulse number corresponding to the traversing is obtained from a chassis traversing motor pulse number table in sequence, and the chassis traversing motor is controlled to operate once according to the chassis traversing motor pulse number; s6, after the traversing is finished, the step S5 is executed repeatedly until N-1 times of traversing are finished; and S7, executing the step S4, and entering the next cycle until the carding machine stops running. By adopting the method, the coiling quantity of the cans is increased, and a better capacity increasing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of textile machinery control, and in particular to a control method for increasing the capacity of a sliver cylinder of a carding machine coiler. Background Art

[0002] The sliver coiler is installed at the front of the carding machine and is an important part of the carding machine. The main function of the sliver coiler is to coil the carded slivers and store the slivers to achieve continuous production.

[0003] Working principle of the sliver coiler: The slivers at the large pressure roller of the carding machine enter the sliver coiler after a certain stretching, and are first supported and guided by the front and rear cotton guide wheels, and then bundled and tightened by the bell mouth, and then compacted and formed by the small pressure roller, and then pulled and guided by the sliver inclined tube in the sliver coiler. Finally, due to the centrifugal force and gravity, the slivers are thrown out through the outlet at the bottom of the sliver inclined tube. Because the chassis drives the sliver barrel to rotate at a low speed, and the sliver coiler rotates at a high speed, the sliver coiler and the sliver barrel have a combined movement. As a result of the combined movement, the slivers after being thrown out are placed in the sliver barrel in a regular shape, and at the same time, the slivers are compacted by the sliver coiler and stored tightly in the sliver barrel layer by layer. When the working barrel is full, the full barrel is replaced and the empty barrel is replaced to achieve continuous production.

[0004] The general requirements for the sliver coiler are that first, the capacity of the sliver must be increased as much as possible in a can of limited size, in order to reduce the machine footprint and the number of can changes, saving labor; secondly, the slivers must be laid evenly in the can, which can facilitate the smooth removal of the slivers from the can and minimize the entanglement and damage of the slivers during the laying and withdrawal process.

[0005] The most widely used type of sliver coiler is the fixed offset type, i.e. the eccentric distance e between the coiler and the can bottom plate is fixed. Its working principle is that the coiler rotates on a fixed axis, the sliver is drawn out from the coiler inclined tube outlet of the coiler, and laid on a positive circular track in the can rotating in the same or opposite direction. Because there is an eccentric distance e between the two and they rotate relative to each other, the relative trajectory of the sliver in the can is a cycloid. Figure 1 The following is a curve of the radial thickness distribution of a single-circle sliver in a fixed offset coiler, where e0 is the eccentricity between the coiler and the bottom plate of the sliver can, R is the radial distance of the sliver can, h is the radial thickness of the cotton layer along the sliver can, and f is the distance from the low point to the high point of the inner thickness of the sliver coil. Figure 1 It can be seen that the fixed offset coiler has the following shortcomings: 1) The diameter of the pores is too large, and the larger space cannot be utilized; 2) The thickness unevenness of the cotton layer in the cylinder is relatively large, and the smaller the pores, the greater the thickness unevenness under the condition of unchanged sliver density; 3) The greater the thickness unevenness of the cotton layer, the fewer the number of cotton layers coiled in the cylinder, and the capacity in the cylinder naturally cannot reach the expected value.

[0006] The Chinese patent publication number CN212560570U discloses a sliver coiler can capacity increasing device, such as Figure 2 and 3 As shown, the chassis 10 is driven by the chassis transmission mechanism to realize traverse and rotation. The chassis transmission mechanism includes a traverse drive mechanism and a rotation drive mechanism. The traverse drive mechanism includes a chassis fixed support frame 22, a chassis traverse support frame 28, and a chassis traverse motor 18. The chassis traverse motor 18 drives the chassis traverse support frame 28 to move back and forth through the traverse transmission component. The traverse transmission component includes a traverse motor reduction device, a traverse crank and a connecting rod 31. One end of the crank is connected to the rotary shaft 19, and the other end of the crank is hinged to one end of the connecting rod 31. The rotation drive mechanism includes a chassis rotary motor 32. The coiling disk of this patented product is a fixed-axis rotary motion, and the strip cans rotate and reciprocate with the chassis 10. In the process of coiling, the cotton strips are arranged and stored in the strip cans after the combined motion of the coiling disk and the strip cans to form a specific trajectory.

[0007] The coiling disk of this patented product is a fixed-axis rotary motion, and the sliver cans are fixed-axis rotary and reciprocating motions with the chassis 10. In the process of coiling, the slivers are arranged and stored in the sliver cans by forming a specific trajectory after the combined motion of the coiling disk and the sliver cans. Compared with the traditional coiler with a fixed-axis transmission chassis, by changing and reducing the pore diameter of the sliver column in the sliver can and reasonably controlling the sliver movement trajectory, a certain capacity increase effect is indeed achieved, but there are still some shortcomings, mainly because its lateral movement is continuous, resulting in problems such as unsatisfactory capacity increase rate and uneven density of sliver coils. Summary of the invention

[0008] The invention provides a control method for increasing the capacity of a sliver can of a carding machine coiler, the purpose of which is to solve the problems of unsatisfactory capacity increase rate and uneven density of sliver coiling in existing equipment by accurately controlling the traverse movement and the rotation speed of the sliver can in stages.

[0009] To achieve the above object, the technical solution of the present invention is:

[0010] The present invention provides a control method for increasing the capacity of a sliver can of a carding machine coiler, comprising the following steps:

[0011] S1. Set initial parameters: according to the characteristics of the raw materials and process requirements, set the density of the slivers, the number of traverse positions N, and the N-1 eccentricity adjustment distances;

[0012] S2. Prepare chassis rotary motor tachometer: According to the strip density and the eccentricity after each traverse adjustment, calculate the rotation speed of the strip can corresponding to each traverse, and then calculate the speed of the chassis rotary motor corresponding to each traverse, and finally obtain a tachometer containing N-1 speed values;

[0013] S3. Prepare the chassis traverse motor pulse number table: According to each eccentricity adjustment distance, the operating angle of the chassis traverse motor can be obtained each time, and then the number of pulses required for each operation of the chassis traverse motor can be obtained, and finally a pulse number table containing N-1 pulse values ​​is obtained;

[0014] S4. Positioning initial position: When the chassis traverse motor is running and the chassis traverse detection sensor is actuated, the can is positioned at the maximum eccentricity position, which is the initial position;

[0015] S5. Execute a traverse: obtain the chassis rotary motor speed corresponding to this traverse from the chassis rotary motor speed table in sequence, and use it to control the can to rotate nearly one circle; at the same time, obtain the chassis traverse motor pulse number corresponding to this traverse from the chassis traverse motor pulse number table in sequence, and use it to control the chassis traverse motor to run once;

[0016] S6. After the traverse is completed, S5 is repeated until N-1 traverses are completed;

[0017] S7. Execute S4 and enter the next cycle until the carding machine stops running.

[0018] Furthermore, the number N of traverse positions is approximately equal to the sum of the numerator and the denominator of the ratio of the maximum and minimum thicknesses of the can radial thicknesses of a single-turn cotton strip.

[0019] Furthermore, the first eccentricity adjustment distance is less than or equal to the width f from the inner low point to the inner high point of the layer circle, and the other eccentricity adjustment distances are approximately equal to half of the first eccentricity adjustment distance.

[0020] Furthermore, the method for preparing the chassis rotary motor tachometer specifically comprises the following steps:

[0021] S21. Calculate the can rotation speed: The relationship between the can density, eccentricity and can rotation speed is as follows:

[0022]

[0023] Where: V: can rotation speed;

[0024] v: sliver coiler output speed;

[0025] e: eccentricity;

[0026] m: strip density;

[0027] D: diameter of coiling disc;

[0028] S22. Calculate the chassis rotary motor speed: According to the chassis rotary motor transmission ratio i and the can rotation speed V, the chassis rotary motor speed V can be calculated. t

[0029]

[0030] S23. Repeat S21 to S22 according to the eccentricity after each traverse adjustment until a tachometer containing N-1 tachometer values ​​is obtained.

[0031] Further, the method for preparing the chassis traverse motor pulse number table specifically comprises the following steps:

[0032] S31. Calculate the straight line OB between the center O of the rotary axis and the end B of the connecting rod away from the rotary axis after the nth eccentricity adjustment n Length:

[0033] OB n =l-r+d n ;

[0034] Where AB is a connecting rod and its length is set to l. The end point A of the connecting rod rotates around point O and the radius of gyration OA is r; d n is the nth eccentricity adjustment distance, n=1, 2, ..., N-1;

[0035] S32. According to the trigonometric formula Then use the principle of inverse trigonometric function to obtain:

[0036]

[0037] S33. Calculate the distance from the initial position A to the position A of one end of the connecting rod n The total number of pulses of chassis traverse motor operation

[0038]

[0039] Among them, P0 is the number of pulses per revolution of the chassis traverse motor, and s is the transmission ratio of the chassis traverse motor;

[0040] S34. Calculate the distance from one end of the connecting rod to position A n-1 To A n Number of pulses of chassis traverse motor operation

[0041]

[0042] Among them, when n = 1,

[0043] S35. Repeat S31 to S34 until a pulse number table containing N-1 pulse values ​​is obtained.

[0044] The beneficial effects achieved by the present invention are:

[0045] 1. The sliver can is driven independently for transverse movement, and the sliver can chassis can be stopped at any position within the range to adjust the eccentricity, making the control more precise;

[0046] 2. The cans are driven independently to rotate. According to the characteristics of the raw materials, the density parameters of the coiled slivers can be easily set, and the rotation speed of the cans at each position can be calculated according to the density and eccentricity to ensure the consistency of the overall density.

[0047] 3. Because the density of slivers is consistent, the amount of slivers in each layer after traverse is proportional to the eccentricity;

[0048] 4. Adjust the eccentricity, reduce the pore diameter, and increase space utilization;

[0049] 5. Adjust the eccentricity to multiple fixed points, stable operation and simplified control;

[0050] 6. Adjust the eccentricity to servo position mode control, with high positioning accuracy and good consistency;

[0051] 7. Considering the stacked layers as a whole, the density unevenness of the cotton layer is reduced;

[0052] 8. With the same can height, the number of cotton layers in the coil increases;

[0053] Taking all factors into consideration, the volume of the sliver can ring is increased to achieve a better capacity expansion effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0055] Figure 1 It is a curve diagram of radial thickness distribution of single-turn sliver in a fixed offset coiler.

[0056] Figure 2 It is a stereoscopic view of the sliver can capacity increasing device of the sliver coiler disclosed in CN212560570U.

[0057] Figure 3 It is a structural schematic diagram of the chassis transmission mechanism of the sliver can capacity increasing device of the sliver coiler disclosed in CN212560570U.

[0058] Figure 4It is a radial thickness distribution curve diagram of a can of multi-turn cotton slivers; wherein, part a shows the radial thickness distribution curve diagram of a can of multi-turn cotton slivers when the present method is adopted and the number of traverse positions N=2; part b shows the radial thickness distribution curve diagram of a can of multi-turn cotton slivers when the conventional method is adopted.

[0059] Figure 5 It is a schematic diagram of the process of converting the circular motion of the chassis traverse motor into the linear motion of the chassis. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0062] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] This patent is a control method developed based on the Chinese patent "A Sliver Coiler Can Capacity Increasing Device" with publication number CN212560570U. The purpose is to maximize the technical potential of this patented product, solve the problems of unsatisfactory capacity increase rate and uneven density of cotton sliver coiling, so as to achieve better capacity increase effect.

[0064] The core idea of ​​the present invention is to adjust the eccentricity in sections to ensure that the highest thickness area of ​​the radial thickness of the strip can of the multi-layer cotton strip ring is staggered to improve the capacity increase rate; at the same time, by adjusting the rotation speed of the strip can at different eccentricities, the strip density of the strip rings with different eccentricities is guaranteed to be consistent.

[0065] Specifically, the control method comprises the following steps:

[0066] S1. Set initial parameters: according to the characteristics of the raw materials and the factory's own process requirements, set the density of the slivers, the number of traverse positions N, and the N-1 eccentricity adjustment distances (i.e., perform N-1 traverses);

[0067] S2. Prepare chassis rotary motor tachometer: According to the strip density and the eccentricity after each traverse adjustment, calculate the rotation speed of the strip can corresponding to each traverse, and then calculate the speed of the chassis rotary motor corresponding to each traverse, and finally obtain a tachometer containing N-1 speed values;

[0068] S3. Prepare the chassis traverse motor pulse number table: According to each eccentricity adjustment distance, the operating angle of the chassis traverse motor can be obtained each time, and then the number of pulses required for each operation of the chassis traverse motor can be obtained, and finally a pulse number table containing N-1 pulse values ​​is obtained;

[0069] S4. Positioning initial position: When the chassis traverse motor is running and the chassis traverse detection sensor is actuated, the can is positioned at the maximum eccentricity position, which is the initial position;

[0070] S5. Perform a traverse movement: obtain the chassis rotary motor speed corresponding to this traverse movement from the chassis rotary motor speed table in sequence, and use it to control the can to rotate nearly one circle, and verify it by detecting the chassis rotation detection sensor; at the same time, obtain the chassis traverse motor pulse number corresponding to this traverse movement from the chassis traverse motor pulse number table in sequence, and use it to control the chassis traverse motor to run once;

[0071] S6. After the traverse is completed, S5 is repeated until N-1 traverses are completed;

[0072] S7. Execute S4 and enter the next cycle until the carding machine stops running.

[0073] Strip density is a commonly used term in the textile field. It is generally defined as the deflection distance of the can after the cotton sliver is placed in a circle. For example, if the can rotates 20mm after the cotton sliver is placed in a circle, the strip density is 20mm. The size of the strip density reflects the tightness of the cotton slivers in the can. The size of the strip density is affected by many factors. It is set according to the characteristics of the raw materials (such as weight, whether it is afraid of adhesion, whether it is pressure-resistant, etc.) and the process requirements of the factory. It is an empirical value.

[0074] The radial thickness distribution curve of the single-layer sliver coiler can refer to Figure 1 It can be seen that: the inner section has more overlapping cotton strips and is thicker, the middle longer section has only two layers of overlapping cotton strips and is the thinnest, and although the outer section has the same number of overlapping cotton strips as the inner section, due to its large radius and large area, the thickness after dispersion is slightly higher than that of the middle section.

[0075] According to different raw materials and strip densities, the ratio of the maximum and minimum radial thickness of the can of single-circle cotton strips is different, the width f from the low point to the high point on the inner side of the layer circle is also different, and the number of traverse positions N is also different; the number of traverse positions N includes the initial position, and the number of traverse positions N is calculated by an empirical formula. Specifically, the number of traverse positions N is approximately equal to the sum of the numerator and denominator of the maximum and minimum radial thickness ratio of the can of single-circle cotton strips; assuming that the maximum and minimum thickness ratio is 2:1, then the number of traverse positions N is more appropriate to be 3. In addition, it is worth noting that capacity cannot be increased for the sake of capacity increase. It is also necessary to comprehensively consider the characteristics of the raw materials, the complexity of the process and the production efficiency. Therefore, the specific value of the number of traverse positions N needs to be determined by the factory according to actual conditions.

[0076] According to the radial thickness distribution curve of the strip can, the eccentricity adjustment distance can be set each time; the size of the first eccentricity adjustment distance refers to the width f from the low point to the high point on the inner side of the layer circle. According to experience, the first eccentricity adjustment distance is less than or equal to the width f from the low point to the high point on the inner side of the layer circle, and the other eccentricity adjustment distances are approximately equal to half of the first eccentricity adjustment distance.

[0077] According to the characteristics of the raw materials, the density of the coiled cotton strips is set, and the rotation speed of the strip can at each traverse position is calculated based on the density and eccentricity. In this way, the density of strips in coils with different eccentricities is consistent, and there is a regular radial thickness distribution curve of the strip can in the layer coils.

[0078] Furthermore, the method for preparing the chassis rotary motor tachometer specifically comprises the following steps:

[0079] S21. Calculate the can rotation speed: The relationship between the can density, eccentricity and can rotation speed is as follows:

[0080]

[0081] Where: V: can rotation speed;

[0082] v: The sliver coiler speed is set according to the factory process requirements, such as 10 meters to 400 meters per minute, which is determined by the user based on raw materials, output, indicators, etc.

[0083] e: eccentricity;

[0084] m: strip density;

[0085] D: diameter of coiling disc;

[0086] S22. Calculate the chassis rotary motor speed: According to the chassis rotary motor transmission ratio i and the can rotation speed V, the chassis rotary motor speed V can be calculated. t :

[0087]

[0088] S23. Repeat S21 to S22 according to the eccentricity after each traverse adjustment until a tachometer containing N-1 tachometer values ​​is obtained.

[0089] It is worth noting that the speed of the can goes through a deceleration / acceleration process from the current traverse cycle to the next traverse cycle, so the actual rotation of the can is only close to one circle, and the specific amount depends on the performance of the chassis rotary motor and the speed difference of different traverse cycles. In addition, although the traverse of the can is segmented, there is no pause between different traverse cycles of the can, and the can rotates at the corresponding speed during the traverse process.

[0090] This method predicts the width f from the low point to the high point inside the layer ring according to the difference in radial thickness distribution curves and the maximum and minimum thickness ratio, which is used as a reference for the first eccentricity adjustment. By moving the chassis horizontally and changing the eccentricity, a superimposed layer ring with the highest thickness area of ​​the two layers of strips is formed, the thickness of the multi-layer strips is reduced, and the pores are reduced, so as to achieve a better capacity increase effect.

[0091] If you want to change the eccentricity, you need to control the chassis traverse movement, and convert the circular motion of the chassis traverse motor into the linear motion of the chassis. If you want to accurately control the precise distance of the chassis traverse movement, you need to find the rotation angle of the chassis traverse motor. Since the chassis traverse motor is a servo motor, when running in position mode, the position pulse amount of the traverse motor can be converted into the change of eccentricity, so as to achieve precise adjustment of the eccentricity.

[0092] The solution for converting the circular motion of the chassis traverse motor into the linear motion of the chassis is as follows: Figure 5 As shown, Figure 5 In the figure, point O is the center of the rotating axis, straight line AB is the connecting rod and its length is set to l, the end point A of the connecting rod rotates around point O and the rotation radius OA is r, and e0 is the maximum eccentricity.

[0093] Example 1: When the eccentricity is the largest, the connecting rod is at the AB position, which is defined as the initial position; at this time, the chassis traverse detection sensor will be activated; when the connecting rod is about to return to the initial position, the chassis traverse motor rotates at a constant speed, and when the chassis traverse detection sensor is detected to be activated, the chassis traverse motor stops immediately;

[0094] Example 4: The rotary shaft rotates 180 degrees, and the connecting rod is at position A0B0. At this time, the eccentricity is the smallest, e=e0-2r. According to the parameters of the chassis traverse motor, that is, the number of pulses per revolution P0 and the transmission ratio s of the chassis traverse motor, the number of pulses of the servo motor running from A to position A0 at one end of the connecting rod can be obtained.

[0095]

[0096] In the second example, the rotation angle of the rotary axis is ∠AOA1, one end of the connecting rod moves from A to A1, and the other end moves from B to B1; at this time, the eccentricity adjustment distance is d1, that is, the eccentricity is e=e0-d1; now according to the set d1, calculate ∠AOA1; in △A1OB1, OA1=r, A1B1=l, it can be known that:

[0097] OB1=OB+BB1=AB-OA+BB1=l-r+d1,

[0098] According to the trigonometric formula Then use the principle of inverse trigonometric function to obtain:

[0099]

[0100] Then we can get ∠AOA1=180-∠A1OB1, and then according to the parameters of the chassis traverse motor, that is, the number of pulses per revolution P0 and the chassis traverse motor transmission ratio s, we can get the total number of pulses of the chassis traverse motor running from the initial position A to the position A1 at one end of the connecting rod.

[0101]

[0102] In the third example, the rotation angle of the rotary axis is ∠AOA2, one end of the connecting rod moves from A to A2, and the other end moves from B to B2; at this time, the eccentricity adjustment distance is d1+d2, that is, the eccentricity is e=e0-d1-d2; now according to the set d1 and d2, calculate ∠AOA2; in △A2OB2, OA2=r, A2B2=l, it can be known that:

[0103] OB2=OB+BB1+B1B2=AB-OA+BB1+B1B2=l-r+d1+d2,

[0104] According to the trigonometric formula Then use the principle of inverse trigonometric function to obtain:

[0105]

[0106] Then we can get ∠AOA2=180-∠A2OB2, and then according to the parameters of the chassis traverse motor, that is, the number of pulses per revolution P0 and the chassis traverse motor transmission ratio s, we can get the total number of pulses of the chassis traverse motor running from the initial position A to the position A2 at one end of the connecting rod.

[0107]

[0108] Then we can calculate the number of pulses of the servo motor when the connecting rod moves from position A1 to position A2:

[0109]

[0110] For a larger number of traverse positions N, the calculation method is similar.

[0111] In summary, the method for preparing the chassis traverse motor pulse number table specifically includes the following steps:

[0112] S31. Calculate the straight line OB between the center O of the rotary axis and the end B of the connecting rod away from the rotary axis after the nth eccentricity adjustment n Length:

[0113] OB n =l-r+d n ;

[0114] Where AB is a connecting rod and its length is set to l. The end point A of the connecting rod rotates around point O and the radius of gyration OA is r; d n is the nth eccentricity adjustment distance, n=1, 2, ..., N-1;

[0115] S32. According to the trigonometric formula Then use the principle of inverse trigonometric function to obtain:

[0116]

[0117] Among them, point A n and B n are the positions of the two end points A and B of the connecting rod after the nth eccentricity adjustment;

[0118] S33. Calculate the distance from the initial position A to the position A of one end of the connecting rod n The total number of pulses of chassis traverse motor operation

[0119]

[0120] Among them, P0 is the number of pulses per revolution of the chassis traverse motor, and s is the transmission ratio of the chassis traverse motor;

[0121] S34. Calculate the distance from one end of the connecting rod to position An-1 To A n Number of pulses of chassis traverse motor operation

[0122]

[0123] Among them, when n = 1,

[0124] S35. Repeat S31 to S34 until a pulse number table containing N-1 pulse values ​​is obtained.

[0125] In order to better illustrate the capacity increase effect of this method, this article will explain it with examples:

[0126] Example 1:

[0127] For example, the maximum and minimum radial thickness ratio of a single-loop sliver can is 2:1, and the number of traverse positions N is 2. Figure 4 The can rotates one circle at the outermost circle position (the position with the maximum eccentricity), and moves the bottom plate of the can inward once to the second position, that is, the eccentricity changes by d1. It rotates one more circle, and then returns to the outermost circle position for the next cycle. The maximum thickness points of the two layers of cotton strips are staggered, which reduces the total thickness after superposition and reduces the pores. The thickness ratio of the superimposed cotton layer becomes smaller, from 2:1 to 3:2. In this way, the number of layers in the can is increased. Although the length of the small circle is shorter, the total length of the cotton strips is still increased after comprehensive calculation, achieving the effect of increasing capacity.

[0128] When the circumference c of the coiling disk is constant and the density m of the slivers is consistent, the total length L of each layer of slivers is proportional to the eccentricity e, that is:

[0129]

[0130] in,

[0131] Take the outermost circle as the first layer, assuming that the amount of cotton strips in the first layer is L1, the eccentricity is e0, and the thickness of the thickest point is h, then L1=ke0, then the amount of cotton strips in the second layer is L2=k(e0-d1), the minimum thickness of the thickest point after the two layers are superimposed is h+0.5h=1.5h, and the total amount of the two layers is L1+L2=ke0+k(e0-d1)=2ke0-kd1;

[0132] If the height of the cotton column in the can is set to H, then the capacity increase is:

[0133]

[0134] Taking a 1-meter-diameter can as an example, the diameter of the coiling disk is 270 mm, e0=350 mm, f is approximately 40 mm, and d1=40 mm, we get P=25.7%, which means a capacity increase of 25.7%.

[0135] Example 2:

[0136] Similarly, taking the number of traverse positions N as 3 as an example, the amount of sliver in the third layer is L3=k(e0-d1-d2), and the minimum thickness of the thickest point after the three layers are stacked is h+0.5h+0.5h=2h, that is, three layers are now placed on the height of the original two layers, and the increased capacity is:

[0137]

[0138] and then

[0139] Taking a 1-meter diameter can as an example, the diameter of the coiling disc is 270 mm, e0=350 mm, f is approximately 40 mm, and d1=40 mm, d2=20 mm, we get P=35.7%.

[0140] Example 3:

[0141] Similarly, taking the number of traverse positions N as 4 as an example, the capacity increase is:

[0142]

[0143] and then

[0144] Taking a 1-meter-diameter sliver can as an example, the diameter of the coiling disc is 270 mm, e0=350 mm, f is approximately 40 mm, and d1=40 mm, d2=20 mm, d3=20 mm, we get P=39.4%.

[0145] Example 4:

[0146] Similarly, taking the number of traverse positions N as 5 as an example, the capacity increase is:

[0147]

[0148] and then

[0149] Taking a 1-meter-diameter sliver can as an example, the diameter of the coiling disc is 270 mm, e0=350 mm, f is approximately 40 mm, and d1=40 mm, d2=20 mm, d3=20 mm, d4=20 mm, we get P=40%.

[0150] Example 5:

[0151] Similarly, taking the number of traverse positions N as 6 as an example, the capacity increase is:

[0152]

[0153] Taking a 1-meter-diameter strip can as an example, the diameter of the strip coil is 270mm, e0=350mm, f is approximately 40mm, and d1=40mm, d2=20mm, d3=20mm, d4=20mm, d5=20mm, and we get P=38.8%.

[0154] If the traverse position continues to increase, the inner sliver circle will be too small, and the total sliver amount in the can will decrease, less than the total amount of 5 traverse positions or 4 traverse positions; considering the capacity increase rate, process complexity and efficiency, in this case, 3 or 4 traverse positions are sufficient.

[0155] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A control method for increasing the capacity of a sliver can of a carding machine coiler, characterized in that: The following steps are involved: S1. Set initial parameters: according to the characteristics of the raw materials and process requirements, set the density of the slivers, the number of traverse positions N, and the N-1 eccentricity adjustment distances; S2. Prepare chassis rotary motor tachometer: According to the strip density and the eccentricity after each traverse adjustment, calculate the rotation speed of the strip can corresponding to each traverse, and then calculate the speed of the chassis rotary motor corresponding to each traverse, and finally obtain a tachometer containing N-1 speed values; S3. Prepare the chassis traverse motor pulse number table: According to each eccentricity adjustment distance, the operating angle of the chassis traverse motor can be obtained each time, and then the number of pulses required for each operation of the chassis traverse motor can be obtained, and finally a pulse number table containing N-1 pulse values ​​is obtained; S4. Positioning initial position: When the chassis traverse motor is running and the chassis traverse detection sensor is actuated, the can is positioned at the maximum eccentricity position, which is the initial position; S5. Execute a traverse: obtain the chassis rotary motor speed corresponding to this traverse from the chassis rotary motor speed table in sequence, and use it to control the can to rotate nearly one circle; at the same time, obtain the chassis traverse motor pulse number corresponding to this traverse from the chassis traverse motor pulse number table in sequence, and use it to control the chassis traverse motor to run once; S6. After the traverse is completed, S5 is repeated until N-1 traverses are completed; S7. Execute S4 and enter the next cycle until the carding machine stops running.

2. A control method for increasing the capacity of a sliver can of a carding machine coiler according to claim 1, characterized in that: The number of traverse positions N is approximately equal to the sum of the numerator and the denominator of the ratio of the maximum and minimum thicknesses of the can radial thicknesses of a single-turn cotton strip.

3. A control method for increasing the capacity of a sliver can of a carding machine coiler according to claim 1, characterized in that: The first eccentricity adjustment distance is less than or equal to the width f from the low point to the high point inside the layer circle, and the other eccentricity adjustment distances are approximately equal to half of the first eccentricity adjustment distance.

4. A control method for increasing the capacity of a sliver can of a carding machine coiler according to any one of claims 1 to 3, characterized in that: The method for preparing the chassis rotary motor tachometer specifically comprises the following steps: S21. Calculate the can rotation speed: The relationship between the can density, eccentricity and can rotation speed is as follows: Where: V: can rotation speed; v: sliver coiler output speed; e: eccentricity; m: strip density; D: diameter of coiling disc; S22. Calculate the chassis rotary motor speed: According to the chassis rotary motor transmission ratio i and the can rotation speed V, the chassis rotary motor speed V can be calculated. t : S23. Repeat S21 to S22 according to the eccentricity after each traverse adjustment until a tachometer containing N-1 tachometer values ​​is obtained.

5. A control method for increasing the capacity of a sliver can of a carding machine coiler according to any one of claims 1 to 3, characterized in that: The method for preparing the chassis traverse motor pulse number table specifically comprises the following steps: S31. Calculate the straight line OB between the center O of the rotary axis and the end B of the connecting rod away from the rotary axis after the nth eccentricity adjustment n Length: OB n =l-r+d n ; Where AB is a connecting rod and its length is set to l. The end point A of the connecting rod rotates around point O and the radius of gyration OA is r; d n is the nth eccentricity adjustment distance, n=1, 2, ..., N-1; S32. According to the trigonometric formula Then use the principle of inverse trigonometric function to obtain: S33. Calculate the distance from the initial position A to the position A of one end of the connecting rod n The total number of pulses of chassis traverse motor operation Among them, P0 is the number of pulses per revolution of the chassis traverse motor, and s is the transmission ratio of the chassis traverse motor; S34. Calculate the distance from one end of the connecting rod to position A n-1 To A n Number of pulses of chassis traverse motor operation Among them, when n = 1, S35. Repeat S31 to S34 until a pulse number table containing N-1 pulse values ​​is obtained.

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