A control method for increasing the capacity of a lap former can

Abstract

This invention relates to the field of textile machinery control technology, specifically to a control method for increasing the capacity of the sliver can in a carding machine coiler; S1. Set initial parameters; S2. Generate the tachometer of the chassis rotary motor; S3. Generate the pulse count table of the chassis traverse motor; S4. Position the initial position; S5. Perform one traverse: sequentially obtain the corresponding chassis rotary motor speed from the chassis rotary motor speed table, and control the sliver can to rotate approximately one revolution; simultaneously, sequentially obtain the corresponding chassis traverse motor pulse count from the chassis traverse motor pulse count table, and control the chassis traverse motor to run once; S6. After this traverse, repeat S5 until N-1 traverses are completed; S7. Execute S4 to enter the next cycle, until the carding machine stops. Using this method, the sliver can coil feed is increased, achieving a better capacity increase effect.

Description

Technical Field

[0001] This invention relates to the field of textile machinery control technology, specifically to a control method for increasing the capacity of the carding machine coiler can. Background Technology

[0002] The coiler, installed at the front of the carding machine, is an important component of the machine. Its main functions are to coil and store the carded sliver, enabling continuous production.

[0003] The working principle of the coiling device: The cotton sliver from the large pressure roller of the carding machine enters the coiling device after a certain draft. It is first supported and guided by the front and rear guide rollers, then bundled and tightened by the trumpet-shaped end, and then pressed and shaped by the small pressure rollers. Next, it is pulled and guided by the inclined coiling tube inside the coiling disc. Finally, due to centrifugal force and gravity, the cotton sliver is thrown out through the outlet at the bottom of the inclined coiling tube. Because the base plate drives the sliver can to rotate at a low speed, while the coiling disc rotates at a high speed, there is a combined motion between the coiling disc and the sliver can. The result of this combined motion is that the thrown-out cotton sliver is placed neatly and regularly in the sliver can, layer by layer, in a tightly packed arrangement within the sliver can. Simultaneously, the cotton sliver is tightly stored in the sliver can by the compression action of the coiling disc. When the working can is full, full cans are replaced and empty cans are replaced, achieving continuous production.

[0004] The requirements for a sliver coiler are generally as follows: First, it should maximize the capacity of the sliver in a sliver can of limited size, in order to reduce the machine's footprint and the number of can changes, thus saving labor. Second, the sliver should be laid evenly in the can, which can facilitate the smooth drawing of the sliver from the can and minimize the entanglement and damage that occur during the laying and drawing process.

[0005] The most widely used type of coiler is the fixed-offset coiler, where the eccentricity e between the coiling disc and the sliver can base is a fixed value. Its working principle is that the coiling disc rotates on a fixed axis, and the sliver is drawn out from the coiling oblique tube outlet of the coiling disc and laid along a circular track in the sliver can, which rotates in the same or opposite directions. Due to the eccentricity e between them and their relative rotation, the relative trajectory of the sliver in the sliver can is a cycloid. Figure 1 This is a radial thickness distribution curve of a single coil of cotton sliver in a fixed-offset coiling device. Here, e0 is the eccentricity between the coiling disc 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 lowest to the highest point of the thickness inside the coil. From... Figure 1 It can be seen that the fixed offset coiler has the following shortcomings: 1) The diameter of the air hole is too large, and a large space cannot be utilized; 2) The thickness of the cotton layer inside the cylinder is uneven, and the smaller the air hole, the greater this thickness unevenness is under the condition of constant sliver density; 3) The greater the thickness unevenness of the cotton layer, the fewer layers of cotton can be coiled inside the cylinder, and the cylinder volume will naturally not reach the expected value.

[0006] Chinese patent CN212560570U discloses a device for increasing the capacity of a bar coiler, such as... Figure 2 and 3 As shown, its features are: the chassis 10 is driven by the chassis transmission mechanism to achieve lateral movement and rotation. The chassis transmission mechanism includes a lateral movement drive mechanism and a rotation drive mechanism. The lateral movement drive mechanism includes a chassis fixed support frame 22, a chassis lateral movement support frame 28, and a chassis lateral movement motor 18. The chassis lateral movement motor 18 drives the chassis lateral movement support frame 28 to reciprocate through the lateral movement transmission components. The lateral movement transmission components include a lateral movement motor reduction device, a lateral movement crank, and a connecting rod 31. One end of the crank is connected to the rotation 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 rotation motor 32. The coiling disc of this patented product has a fixed-axis rotational motion, and the sliver can rotates and reciprocates along the chassis 10. During the coiling process, the sliver forms a specific trajectory after the combined motion of the coiling disc and the sliver can, and is arranged and stored in the sliver can.

[0007] This patented product features a fixed-axis rotary coiling disc, with the sliver canister rotating and reciprocating along the base 10. During coiling, the sliver, after being combined with the coiling disc and the sliver canister, forms a specific trajectory for arrangement and storage within the canister. Compared to traditional coilers with fixed-axis drive bases, this product achieves a certain capacity increase by reducing the diameter of the sliver column pores in the canister and by rationally controlling the sliver's movement trajectory. However, it still has shortcomings, primarily due to the continuous lateral movement, which leads to issues such as unsatisfactory capacity increase and uneven sliver density. Summary of the Invention

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

[0009] To achieve the above objectives, the technical solution of the present invention is as follows:

[0010] This invention provides a method for controlling the increase of sliver can volume in a carding machine coiler, comprising the following steps:

[0011] S1. Set initial parameters: Based on the characteristics of the raw materials and process requirements, set the density of the coiled cotton strip, the number of lateral movement positions N, and the N-1 eccentricity adjustment distances;

[0012] S2. To obtain a tachometer for the chassis rotary motor: Based on the strip density and the eccentricity after each lateral movement adjustment, calculate the rotational speed of the strip drum corresponding to each lateral movement, and then calculate the speed of the chassis rotary motor corresponding to each lateral movement. Finally, obtain a tachometer containing N-1 speed values.

[0013] S3. Generate a pulse count table for the chassis lateral motor: Based on the adjustment distance of the eccentricity each time, the running angle of the chassis lateral motor can be obtained each time, and then the number of pulses required for each run of the chassis lateral motor can be obtained. Finally, a pulse count table containing N-1 pulse values ​​is obtained.

[0014] S4. Positioning the initial position: When the chassis lateral motor is running, and the chassis lateral detection sensor is activated, the strip is positioned at the maximum eccentricity position, which is the initial position.

[0015] S5. Perform one lateral movement: Sequentially obtain the chassis rotary motor speed corresponding to this lateral movement from the chassis rotary motor speed table, and use this to control the drum to rotate approximately one revolution; at the same time, sequentially obtain the chassis lateral motor pulse number corresponding to this lateral movement from the chassis lateral motor pulse number table, and use this to control the chassis lateral motor to run once.

[0016] S6. After this lateral movement ends, repeat S5 until N-1 lateral movements are completed;

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

[0018] Furthermore, the number N of lateral movement positions is approximately equal to the sum of the numerator and denominator of the ratio of the maximum to minimum radial thickness of a single loop of cotton sliver.

[0019] Furthermore, 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, and the other eccentricity adjustment distances are approximately half of the first eccentricity adjustment distance.

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

[0021] S21. Calculation of bar rotation speed: The relationship between bar density, eccentricity, and bar rotation speed is as follows:

[0022]

[0023] In the formula: V: rotational speed of the bar drum;

[0024] v: Output speed of the coiler;

[0025] e: Eccentricity;

[0026] m: dense stripes;

[0027] D: Diameter of the coiled disc;

[0028] S22. Calculate the speed of the chassis rotary motor: Based on the transmission ratio i of the chassis rotary motor and the rotational speed V of the drum, the speed V of the chassis rotary motor can be calculated. t

[0029]

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

[0031] Furthermore, the method for generating the chassis transverse motor pulse count table specifically includes the following steps:

[0032] S31. Calculate the straight line OB between the center O of the rotating shaft and point B, the end of the connecting rod furthest from the rotating shaft, after the nth eccentricity adjustment. n Length:

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

[0034] Where AB is a link with a set length of l, and the endpoint A of the link rotates around point O with a radius of rotation OA of r; d n Let n be the distance for the nth eccentricity adjustment, where n = 1, 2, ..., N-1;

[0035] S32. Based on the trigonometric function formulas Using the principle of inverse trigonometric functions, we can obtain:

[0036]

[0037] S33. Calculate the distance from the initial position A to the position A' of one end of the link. n Total number of pulses of chassis lateral motor operation

[0038]

[0039] Where P0 is the number of pulses per revolution of the chassis lateral motor, and s is the transmission ratio of the chassis lateral motor;

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

[0041]

[0042] When n = 1,

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

[0044] The beneficial effects achieved by this invention are as follows:

[0045] 1. The independent drive for the transverse movement of the strip drum allows the strip drum chassis to be stopped at any position within the range to adjust the eccentricity, resulting in more precise control;

[0046] 2. The sliver can rotation is independently driven. According to the characteristics of the raw materials, the sliver density parameters of the coiled sliver can be easily set, and the rotation speed of the sliver can at each position can be calculated based on the sliver density and eccentricity to ensure the consistency of the overall sliver density.

[0047] 3. Because the sliver density is consistent, the amount of sliver in each layer after transverse movement is directly proportional to the eccentricity.

[0048] 4. Adjust the eccentricity to reduce the diameter of the pores and increase space utilization;

[0049] 5. Adjusting the eccentricity to a multi-point fixed-point configuration results in stable operation and simplified control;

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

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

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

[0053] Taking all factors into account, the amount of material added to the strip coil is increased to achieve a better capacity increase effect. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0055] Figure 1 This is a radial thickness distribution curve of a single coil of cotton sliver using a fixed-bias coiler.

[0056] Figure 2 This is a perspective view of the bar coiling device for increasing bar capacity disclosed in CN212560570U.

[0057] Figure 3 This is a schematic diagram of the chassis transmission mechanism of the bar coiling device for increasing bar capacity disclosed in CN212560570U.

[0058] Figure 4This is a radial thickness distribution curve of a multi-turn sliver; part a shows the radial thickness distribution curve of the multi-turn sliver when the method is used and the number of lateral movement positions N=2; part b shows the radial thickness distribution curve of the multi-turn sliver when the conventional method is used.

[0059] Figure 5 This is a schematic diagram illustrating the process of converting the circular motion of the chassis lateral motor into the linear motion of the chassis. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort 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 indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0062] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0063] This patent is a control method developed based on Chinese patent CN212560570U, "A Stringer Canister Capacity Enhancement Device". The purpose is to maximize the technical potential of this patented product and solve the problems of unsatisfactory capacity enhancement rate and uneven string density of cotton sliver, so as to achieve a better capacity enhancement effect.

[0064] The core idea of ​​this invention is to adjust the eccentricity in segments to ensure that the highest thickness area of ​​the radial thickness of the sliver coil is misaligned, thereby increasing the volume ratio; at the same time, by adjusting the rotation speed of the sliver coil at different eccentricities, the sliver density of the sliver coils with different eccentricities is ensured to be consistent.

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

[0066] S1. Set initial parameters: Based on the characteristics of the raw materials and the factory's own process requirements, set the density of the coiled cotton sliver, the number of lateral movement positions N, and the N-1 eccentricity adjustment distances (i.e., perform N-1 lateral movements);

[0067] S2. To obtain a tachometer for the chassis rotary motor: Based on the strip density and the eccentricity after each lateral movement adjustment, calculate the rotational speed of the strip drum corresponding to each lateral movement, and then calculate the speed of the chassis rotary motor corresponding to each lateral movement. Finally, obtain a tachometer containing N-1 speed values.

[0068] S3. Generate a pulse count table for the chassis lateral motor: Based on the adjustment distance of the eccentricity each time, the running angle of the chassis lateral motor can be obtained each time, and then the number of pulses required for each run of the chassis lateral motor can be obtained. Finally, a pulse count table containing N-1 pulse values ​​is obtained.

[0069] S4. Positioning the initial position: When the chassis lateral motor is running, and the chassis lateral detection sensor is activated, the strip is positioned at the maximum eccentricity position, which is the initial position.

[0070] S5. Perform one lateral movement: Sequentially obtain the chassis slewing motor speed corresponding to this lateral movement from the chassis slewing motor speed table, and use this to control the strip drum to rotate approximately one revolution, and verify by detecting the chassis slewing detection sensor; at the same time, sequentially obtain the chassis lateral movement motor pulse number corresponding to this lateral movement from the chassis lateral movement motor pulse number table, and use this to control the chassis lateral movement motor to run once;

[0071] S6. After this lateral movement ends, repeat S5 until N-1 lateral movements are completed;

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

[0073] Sliver density is a commonly used term in the textile industry. Broadly defined, it refers to the distance the sliver can rotates after the sliver has completed one loop. For example, if the sliver can rotates 20mm after one loop, the sliver density is 20mm. Sliver density reflects the tightness of the coils of sliver within the sliver can. It is influenced by various factors and is determined based on the characteristics of the raw material (such as weight, susceptibility to sticking, and compressive strength) and the factory's process requirements; it is an empirical value.

[0074] The radial thickness distribution curve of the single-layer cotton sliver coil can be referenced. Figure 1 It can be seen that: the inner section has more overlapping cotton strips and is thicker, the middle section has only two overlapping cotton strips and is the thinnest, and the outer section has the same number of overlapping cotton strips as the inner section, but because of its larger radius and larger area, the thickness after dispersion is slightly higher than that of the middle section.

[0075] Depending on the raw materials and sliver density, the ratio of the maximum to minimum radial thickness of a single-loop sliver can varies, as does the width f from the low to the high point inside the loop, and consequently, the number of lateral movement positions N. The number of lateral movement positions N includes the initial position and is calculated using an empirical formula. Specifically, the number of lateral movement positions N is approximately equal to the sum of the numerator and denominator of the ratio of the maximum to minimum radial thickness of the single-loop sliver can. Assuming a maximum to minimum thickness ratio of 2:1, then a value of 3 for the number of lateral movement positions N would be suitable. Furthermore, it is important to note that capacity should not be increased simply for the sake of increasing capacity; the characteristics of the raw materials, the complexity of the process, and production efficiency must be comprehensively considered. Therefore, the specific value of the number of lateral movement positions N needs to be determined by the factory based on the actual situation.

[0076] Based on the radial thickness distribution curve of the strip, the eccentricity adjustment distance for each step can be set. The size of the first eccentricity adjustment distance is referenced to the width f from the low point to the high point inside the layer ring. Based on experience, 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 ring, and the other eccentricity adjustment distances are approximately half of the first eccentricity adjustment distance.

[0077] Based on the characteristics of the raw materials, the sliver density of the coiled sliver is set, and the rotation speed of the sliver can at each lateral position is calculated based on the sliver density and the eccentricity. In this way, the sliver density of the coils with different eccentricities is consistent, resulting in a regular radial thickness distribution curve of the sliver can in the coils.

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

[0079] S21. Calculation of bar rotation speed: The relationship between bar density, eccentricity, and bar rotation speed is as follows:

[0080]

[0081] In the formula: V: rotational speed of the bar drum;

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

[0083] e: Eccentricity;

[0084] m: dense stripes;

[0085] D: Diameter of the coiled disc;

[0086] S22. Calculate the speed of the chassis rotary motor: Based on the transmission ratio i of the chassis rotary motor and the rotational speed V of the drum, the speed V of the chassis rotary motor can be calculated. t :

[0087]

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

[0089] It's worth noting that the drum's rotation speed undergoes a deceleration / acceleration process as it transitions from one lateral movement cycle to the next. Therefore, the drum actually rotates approximately one revolution, the exact number depending on the performance of the chassis rotary motor and the speed difference between different lateral movement cycles. Furthermore, although the drum's lateral movement is segmented, there is no pause between different lateral movement cycles, and the drum continuously rotates at the corresponding speed throughout the lateral movement.

[0090] This method predicts the width f from the lowest to the highest point inside the layer ring based on the different radial thickness distribution curves and the ratio of the maximum to the minimum thickness, serving as a reference for the first eccentricity adjustment. By lateral movement of the chassis, the eccentricity is changed, forming overlapping layers with misaligned maximum thickness regions of the two layers, reducing the thickness of the multiple layers and simultaneously shrinking the pores, thereby achieving a better volume-increasing effect.

[0091] To change the eccentricity, it is necessary to control the chassis lateral movement, which requires converting the circular motion of the chassis lateral motor into the linear motion of the chassis. To precisely control the exact distance of the chassis lateral movement, it is necessary to determine the rotation angle of the chassis lateral motor. Since the chassis lateral motor is a servo motor, when operating in position mode, the position pulse quantity of the lateral motor can be converted into the change in eccentricity, thus achieving precise adjustment of the eccentricity.

[0092] The scheme for converting the circular motion of the chassis lateral motor into the linear motion of the chassis is as follows: Figure 5 As shown, Figure 5 In the diagram, point O is the center of the rotation axis, line AB is a connecting rod with a set length of l, the endpoint A of the connecting rod rotates around point O with a rotation radius OA of r, and e0 is the maximum eccentricity.

[0093] First example: When the eccentricity is at its maximum, the connecting rod is at position AB, which is the initial position; at this time, the chassis lateral movement detection sensor will activate; when the connecting rod is about to return to the initial position, the chassis lateral movement motor rotates at a constant speed, and when the activation of the chassis lateral movement detection sensor is detected, the chassis lateral movement motor immediately stops.

[0094] Fourth example: When the rotary shaft rotates 180 degrees, the connecting rod is at position A0B0. At this point, the eccentricity is minimal, e = e0 - 2r. Based on the parameters of the chassis traverse motor, namely the number of pulses per revolution P0 and the transmission ratio s of the chassis traverse motor, the number of pulses the servo motor takes to move the connecting rod from position A to position A0 can be calculated.

[0095]

[0096] In the second example, the rotation angle of the rotating shaft 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, based on the set d1, calculate ∠AOA1. In △A1OB1, OA1 = r, A1B1 = l, we know that:

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

[0098] According to the trigonometric function formula Using the principle of inverse trigonometric functions, we can obtain:

[0099]

[0100] Therefore, ∠AOA1 = 180 - ∠A1OB1. Then, based on the parameters of the chassis lateral motor, namely the number of pulses per revolution P0 and the transmission ratio s of the chassis lateral motor, the total number of pulses generated by the chassis lateral motor from the initial position A to position A1 can be calculated.

[0101]

[0102] In the third example, the rotation angle of the rotating shaft 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, based on the set d1 and d2, calculate ∠AOA2. In △A2OB2, OA2 = r, A2B2 = l, we know that:

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

[0104] According to the trigonometric function formula Using the principle of inverse trigonometric functions, we can obtain:

[0105]

[0106] Therefore, we can obtain ∠AOA2=180-∠A2OB2. Then, based on the parameters of the chassis lateral motor, namely the number of pulses per revolution P0 and the transmission ratio s of the chassis lateral motor, we can calculate the total number of pulses that the chassis lateral motor will generate from the initial position A to the position A2 of one end of the connecting rod.

[0107]

[0108] Then, the number of pulses required for the servo motor to operate from position A1 to position A2 can be calculated.

[0109]

[0110] For an even greater number of lateral positions N, the calculation method follows the same logic.

[0111] In summary, the method for generating the chassis transverse motor pulse count table specifically includes the following steps:

[0112] S31. Calculate the straight line OB between the center O of the rotating shaft and point B, the end of the connecting rod furthest from the rotating shaft, after the nth eccentricity adjustment. n Length:

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

[0114] Where AB is a link with a set length of l, and the endpoint A of the link rotates around point O with a radius of rotation OA of r; d n Let n be the distance for the nth eccentricity adjustment, where n = 1, 2, ..., N-1;

[0115] S32. Based on the trigonometric function formulas Using the principle of inverse trigonometric functions, we can obtain:

[0116]

[0117] Among them, point A n and B n These 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 link. n Total number of pulses of chassis lateral motor operation

[0119]

[0120] Where P0 is the number of pulses per revolution of the chassis lateral motor, and s is the transmission ratio of the chassis lateral motor;

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

[0122]

[0123] When n = 1,

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

[0125] To better illustrate the capacity expansion effect of this method, this article will use examples:

[0126] Example 1:

[0127] Taking a single-loop cotton sliver with a maximum to minimum radial thickness ratio of 2:1 and a lateral movement number N of 2 as an example, such as... Figure 4 The sliver can rotates once at the outermost position (the position with the largest eccentricity), and then the base of the sliver can is moved inward once to the second position, that is, the eccentricity changes by d1. Then it rotates once more and returns to the outermost position to start the next cycle. This shifts the maximum thickness points of the two layers of cotton sliver, reducing the total thickness after stacking, and at the same time reducing the size of the air holes. The thickness ratio of the stacked cotton layers becomes smaller, changing from 2:1 to 3:2. This increases the number of layers in the sliver can. Although the length of the smaller layers is slightly shorter, the total length of the cotton sliver still increases after comprehensive calculation, achieving the effect of increasing volume.

[0128] With a constant circumference c of the sliver coil and a uniform sliver density m, the total length L of each layer of sliver is proportional to the eccentricity e, that is:

[0129]

[0130] in,

[0131] Taking the outermost ring as the first layer, assuming the amount of cotton swabs 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 swabs in the second layer is L2 = k(e0-d1). The thickness of the thickest point after the two layers are superimposed is the minimum of h + 0.5h = 1.5h. The total amount of cotton swabs in the two layers is L1 + L2 = ke0 + k(e0-d1) = 2ke0 - kd1.

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

[0133]

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

[0135] Example 2:

[0136] Similarly, taking a horizontal movement of N as an example, the amount of cotton sliver in the third layer is L3 = k(e0 - d1 - d2). The thickness of the thickest point after the three layers are stacked is the minimum of h + 0.5h + 0.5h = 2h. That is, if three layers are now placed on top of the original two layers, the increase in capacity is:

[0137]

[0138] and then

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

[0140] Example 3:

[0141] Similarly, taking a horizontal movement position N of 4 as an example, the increase in capacity is:

[0142]

[0143] and then

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

[0145] Example 4:

[0146] Similarly, taking a horizontal movement number N of 5 as an example, the increase in capacity is:

[0147]

[0148] and then

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

[0150] Example 5:

[0151] Similarly, taking a horizontal movement position N of 6 as an example, the increase in capacity is:

[0152]

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

[0154] If the number of transverse positions continues to increase, the inner cotton sliver loop will be too small, and the total amount of cotton sliver in the sliver tube will decrease, less than the total amount of 5 or 4 transverse positions. Considering the capacity increase rate, process complexity and efficiency, in this case, 3 or 4 transverse positions are sufficient.

[0155] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for controlling the increase of sliver can volume in a carding machine coiler, characterized in that, Includes the following steps: S1. Set initial parameters: Based on the characteristics of the raw materials and process requirements, set the density of the coiled cotton strip, the number of lateral movement positions N, and the N-1 eccentricity adjustment distances; S2. To obtain a tachometer for the chassis rotary motor: Based on the strip density and the eccentricity after each lateral movement adjustment, calculate the rotational speed of the strip drum corresponding to each lateral movement, and then calculate the speed of the chassis rotary motor corresponding to each lateral movement. Finally, obtain a tachometer containing N-1 speed values. S3. Generate a pulse count table for the chassis lateral motor: Based on the adjustment distance of the eccentricity each time, the running angle of the chassis lateral motor can be obtained each time, and then the number of pulses required for each run of the chassis lateral motor can be obtained. Finally, a pulse count table containing N-1 pulse values ​​is obtained. S4. Positioning the initial position: When the chassis lateral motor is running, and the chassis lateral detection sensor is activated, the strip is positioned at the maximum eccentricity position, which is the initial position. S5. Perform one lateral movement: Sequentially obtain the chassis rotary motor speed corresponding to this lateral movement from the chassis rotary motor speed table, and use this to control the drum to rotate approximately one revolution; at the same time, sequentially obtain the chassis lateral motor pulse number corresponding to this lateral movement from the chassis lateral motor pulse number table, and use this to control the chassis lateral motor to run once. S6. After this lateral movement ends, repeat S5 until N-1 lateral movements are completed; S7. Execute S4 to enter the next cycle until the carding machine stops running.

2. The control method for increasing the volume of the carding machine coiler can according to claim 1, characterized in that: The number of lateral movement positions N is approximately equal to the sum of the numerator and denominator of the ratio of the maximum to minimum radial thickness of a single loop of cotton sliver.

3. The method for controlling the increase of sliver can volume in 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 lowest point to the highest point inside the layer ring, and the other eccentricity adjustment distances are approximately half of the first eccentricity adjustment distance.

4. A method for controlling the increase of sliver can volume in a carding machine coiler according to any one of claims 1 to 3, characterized in that, The method for generating the chassis rotary motor tachometer specifically includes the following steps: S21. Calculation of bar rotation speed: The relationship between bar density, eccentricity, and bar rotation speed is as follows: In the formula: V: rotational speed of the bar drum; v: Output speed of the coiler; e: Eccentricity; m: dense stripes; D: Diameter of the coiled disc; S22. Calculate the speed of the chassis rotary motor: Based on the transmission ratio i of the chassis rotary motor and the rotational speed V of the drum, the speed V of the chassis rotary motor can be calculated. t : S23. Repeat S21 to S22 based on the eccentricity after each lateral adjustment until a tachometer containing N-1 speed values ​​is obtained.

5. A method for controlling the increase of sliver can volume in a carding machine coiler according to any one of claims 1 to 3, characterized in that, The method for generating the chassis transverse motor pulse count table specifically includes the following steps: S31. Calculate the straight line OB between the center O of the rotating shaft and point B, the end of the connecting rod furthest from the rotating shaft, after the nth eccentricity adjustment. n Length: OB n =l-r+d n ; Where AB is a link with a set length of l, and the endpoint A of the link rotates around point O with a radius of rotation OA of r; d n Let n be the distance for the nth eccentricity adjustment, where n = 1, 2, ..., N-1; S32. Based on the trigonometric function formulas Using the principle of inverse trigonometric functions, we can obtain: S33. Calculate the distance from the initial position A to the position A' of one end of the link. n Total number of pulses of chassis lateral motor operation Where P0 is the number of pulses per revolution of the chassis lateral motor, and s is the transmission ratio of the chassis lateral motor; S34. Calculate the distance from position A to one end of the connecting rod. n-1 To A n Number of pulses of chassis lateral motor When n = 1, S35. Repeat S31 to S34 until a pulse count table containing N-1 pulse values ​​is obtained.

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