Design method of height of combing cylinder tooth of cotton spinning combing machine

Abstract

The application relates to the technical field of cotton spinning combing machine cylinder technology, and discloses a design method of the height of a cotton spinning combing machine cylinder tooth piece, which comprises the following steps: calculating the fiber roots of a cotton roll cross section, calculating the total area of the transverse fiber cross section in the cotton roll, calculating the fiber area on the cylinder tooth piece width during the combing process, and calculating the cylinder needle tooth height value; step 1: calculating the fiber roots of the cotton roll cross section; step 2: calculating the total area of the transverse fiber cross section in the cotton roll; step 3: calculating the fiber area on the cylinder tooth piece width during the combing process; and step 4: calculating the cylinder needle tooth height value. The corresponding tooth piece can be made according to the specific properties of the fiber, so that the problem of combing leakage can be effectively solved, and the combing effect on the fiber is improved.

Description

Technical Field

[0001] This invention relates to the field of cylinder technology for cotton spinning combing machines, specifically a method for designing the height of the cylinder teeth in a cotton spinning combing machine. Background Technology

[0002] A cotton combing machine uses cylinder needles to comb the fibers, removing neps, short fibers, and impurities, and separating, straightening, and parallelizing the fibers. This significantly improves the quality and style of yarn and fabric, achieving a higher level of quality. The height of the cylinder needles is a crucial parameter affecting combing quality. If the needle height is too small, the needles cannot completely penetrate the fiber layer during combing, resulting in some fibers floating on the cylinder surface and causing "missed combing." If the needle height is too large, it affects the needle density. Furthermore, the combing area of ​​the cylinder needles (e.g., ...) also affects the combing quality. Figure 1 Because the separation, parallelism, and straightness of fibers vary during combing, the squeezing and combing forces between the cylinder needles and fibers also differ, thus requiring varying cylinder needle heights. Currently, the design of cylinder needle heights for cotton spinning combing machines is primarily determined based on practical production experience, and a systematic design theory and methodology have not yet been established. In particular, the design or selection of cylinder needles when combing with a blend of two or more fibers remains a significant challenge in combing production.

[0003] Patent CN201220108051 discloses a needle arrangement structure for a variable-speed carding cylinder in a cotton spinning combing machine. The variable-speed carding cylinder has a plurality of needles spaced apart on its outer arc surface, arranged axially. The needle density on both sides of the circumference of the variable-speed carding cylinder is greater than the needle density in the middle of the circumference. However, this type of cylinder cannot be adapted to the specific fiber during carding, easily leading to missed carding and severely affecting the carding effect.

[0004] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention discloses a method for designing the height of the cylinder teeth in a cotton spinning combing machine. The method can determine the appropriate teeth based on the fiber roll weight, fiber linear density, and fiber standard moisture regain, thereby effectively solving the problem of missed combing and improving the combing effect on the fibers.

[0006] The technical solution of this invention is: a method for designing the height of the cylinder teeth of a cotton spinning combing machine, comprising the following steps:

[0007] Step 1: Calculate the number of fibers M in the cross-section of the cotton roll:

[0008]

[0009] Where W is the fiber roll dry weight, w is the fiber linear density, and ε is the fiber standard moisture regain. The number of fibers in the cross-section of the fiber roll is calculated using the weight of the fed combed fiber roll and the fiber linear density.

[0010] Step 2: Calculate the total cross-sectional area s of the transverse fibers in the cotton roll. A :

[0011]

[0012] Where d0 is the fiber diameter, in mm. The total area of ​​a single fiber and the cross-section of the fiber roll is calculated using the fiber diameter, and then converted into the cross-sectional area of ​​the fiber on each needle tooth.

[0013] Step 3: Calculate the fiber area s on the width of the cylinder teeth during the combing process. a :

[0014]

[0015] Where γ is the fiber expansion coefficient of the fiber layer during the carding process, and D is the thickness of the base of the cylinder tooth plate;

[0016] Step 4: Calculate the cylinder pin height value h:

[0017]

[0018] Where a is the width of the cylinder tooth (mm), c is the bottom width of the cylinder tooth (mm), and β is the fiber filling coefficient within the needle teeth.

[0019] Preferably, in step 1, the unit of fiber roll dry weight is g / m, the unit of fiber linear density is g / 1000m, and the unit of fiber standard moisture regain is %. The number of fibers in the cross-section of the fiber roll is calculated using the weight of the fed combed fiber roll and the fiber linear density.

[0020] Preferably, in step 2, the unit of fiber diameter is mm. The total area of ​​a single fiber and the cross-section of the fiber roll is calculated using the fiber diameter, and then converted into the cross-sectional area of ​​the fiber on each needle tooth.

[0021] Preferably, the coefficient of thermal expansion in step 3 is 2-3, and the thickness of the base of the cylinder tooth plate is measured in mm using a micrometer.

[0022] Preferably, in step 4, a is the width of the cylinder tooth plate in mm, c is the bottom width of the cylinder tooth plate in mm, β is the fiber filling coefficient in the needle teeth with a value of 0.65-0.95, and the height of the cylinder needle teeth is calculated by measuring the expansion coefficient of the fiber layer and the fiber filling rate in the cross section of the cylinder needle teeth during the combing process.

[0023] Preferably, the fiber filling coefficient in the needle teeth is the proportion of the fiber entering the two teeth and the gap between the teeth, which is the proportion of the total fiber volume in the gap between the teeth.

[0024] The advantages of this invention are as follows: 1. This invention calculates the height of the cylinder teeth based on the number of fibers in the cross-section of the cotton roll, the total cross-sectional area of ​​the transverse fibers in the cotton roll, and the fiber area on the width of the cylinder teeth during the combing process. The cylinder teeth with this height can completely penetrate the fiber layer, avoiding some fibers from floating on the cylinder needle surface and causing "missed combing", thus fully combing the fibers and improving the combing effect of the cylinder on the fibers.

[0025] 2. This invention facilitates the full penetration and opening of the fiber bundle by the cylinder needles, thereby better removing neps, impurities and short fibers from the fiber bundle, improving the parallelism, straightness and separation of the fibers, reducing neps, thick and thin spots in the yarn, reducing hairiness, improving yarn strength and significantly improving yarn quality.

[0026] 3. This invention targets different types of fibers. By calculating the height of the toothed blades, the fibers can be fully combed, improving the combing effect and increasing the removal rate of short fibers, neps, and impurities in the cotton lap. This reduces the content of short fibers and neps in the combed sliver, thereby reducing the number of thick and thin sections and neps in the yarn, lowering the evenness, and increasing the strength. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the improved cylinder structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the cylinder tooth plate of the present invention.

[0029] The components are: 1. gear plate, 2. needle plate, 3. cylinder body, and 4. cylinder shaft. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] like Figure 1-2As shown, a method for designing the height of the cylinder teeth of a cotton combing machine includes calculating the number of fibers in the cross-section of the cotton lap, calculating the total cross-sectional area of ​​the transverse fibers in the cotton lap, calculating the fiber area on the width of the cylinder teeth during the combing process, and calculating the cylinder tooth height value.

[0032] Includes the following steps:

[0033] Step 1: Calculate the number of fibers M in the cross-section of the cotton roll:

[0034]

[0035] Step 2: Calculate the total cross-sectional area s of the transverse fibers in the cotton roll. A :

[0036]

[0037] Step 3: Calculate the fiber area s on the width of the cylinder teeth during the combing process. a :

[0038]

[0039] Step 4: Calculate the cylinder pin height value h:

[0040]

[0041] In step 1, W is the fiber roll dry weight (g / m), w is the fiber linear density (g / 1000m), and ε is the fiber standard moisture regain (%). The number of fibers in the cross-section of the fiber roll is calculated using the weight of the fed combed fiber roll and the fiber linear density.

[0042] In step 2, d0 is the fiber diameter (mm). The total area of ​​a single fiber and the cross-section of the fiber roll is calculated using the fiber diameter, and then converted into the cross-sectional area of ​​the fiber on each needle tooth.

[0043] In step 3, γ is the fiber expansion coefficient of the fiber layer during the carding process, with a coefficient of 2-3, and D is the thickness of the base of the cylinder tooth plate (mm).

[0044] In step 4, a is the width of the cylinder tooth (mm), b is the lateral distance between the tooth tips, c is the bottom width of the cylinder tooth (mm), h is the height of the cylinder tooth (mm), and β is the fiber filling coefficient in the needle teeth, which has a value of 0.65-0.95. The height of the cylinder needle teeth is calculated by measuring the expansion coefficient of the fiber layer and the fiber filling rate in the cross section of the cylinder needle teeth during the carding process.

[0045] Figure 1 The middle gear 1 is located on the needle plate 2, the needle plate 2 is located on the periphery of the cylinder body 3, and the cylinder shaft 4 is located at the center of the cylinder body 3.

[0046] The height h of the toothed plate 1 on the cylinder 4 is the distance between the top and bottom of the toothed plate.

[0047] The cylinder tooth plate 1 has five combing zones, namely A, B, C, D and E. The combing zones change from sparse to dense from A to E. The thickness of the base of the cylinder tooth plate 1 gradually decreases, the lateral distance between the tooth tips gradually decreases, and the height of the cylinder needle teeth gradually decreases.

[0048] The following example, using the design of the five carding zones of a cotton combing machine cylinder, illustrates the design method for the cylinder tooth height:

[0049] Example 1

[0050] Given that the dry weight W of the cotton fiber roll is 75 g / m, the linear density w of the cotton fiber is 0.15 tex, the standard moisture regain ε of the cotton fiber is 8.5%, and the diameter d0 of the cotton fiber is 18 × 10⁻⁶ mm, the cotton fiber has a dry weight W of 75 g / m, the linear density w of the cotton fiber is 0.15 tex, the standard moisture regain ε of the cotton fiber is 8.5%, and the diameter d0 of the cotton fiber is 18 × 10⁻⁶ mm. -3 mm, the width a of the cylinder tip is 0.06 mm, the width c of the bottom of the cylinder gap is 0.2 mm, the expansion coefficient γ of the cotton layer during the carding process is measured to be 2.5, and the base thickness D of the cylinder needles in the first to fifth carding zones and the filling coefficient β of the fibers in the needles are shown in Table 1.

[0051] The calculation is performed according to the following steps: (1) Calculate the number of fibers M in the cross-section of the cotton roll (see Table 1); (2) Calculate the total cross-sectional area s of the transverse fibers in the cotton roll. A The values ​​are shown in Table 1; (3) Calculate the fiber area s on the width of the cylinder teeth 1 in each combing zone. a See Table 1; (4) Calculate the height h value of the cylinder needles in different combing zones, as shown in Table 1.

[0052] Table 1

[0053] sorting area D / mm β / ％ M / root <![CDATA[S A / mm 2 ]]> <![CDATA[s a / mm 2 ]]> h / mm 1 0.8 70 <![CDATA[5.425×10 5 ]]> 137.979 0.92 2.8 2 0.6 75 <![CDATA[5.425×10 5 ]]> 137.979 0.69 2.5 3 0.5 80 <![CDATA[5.425×10 5 ]]> 137.979 0.575 2.2 4 0.5 80 <![CDATA[5.425×10 5 ]]> 137.979 0.575 2.2 5 0.4 90 <![CDATA[5.425×10 5 ]]> 137.979 0.46 1.9

[0054] Example 2

[0055] Given that the dry weight W of the long-staple cotton fiber roll is 70 g / m, the linear density w of the cotton fiber is 0.123 tex, the standard moisture regain ε of the cotton fiber is 8.5%, the diameter d_0 of the cotton fiber is 14 × 10⁻³ mm, the width a of the cylinder tooth tip is 0.06 mm, the bottom width c of the cylinder gap is 0.2 mm, the expansion coefficient γ of the cotton layer during the carding process is measured to be 3, and the base thickness D of the cylinder teeth in the first to fifth carding zones and the fiber filling coefficient β within the teeth are shown in Table 2.

[0056] Table 2

[0057] sorting area D / mm β / ％ M / root <![CDATA[s A / mm 2 ]]> <![CDATA[s a / mm 2 ]]> h / mm 1 0.8 70 <![CDATA[6.175×10 5 ]]> 95.009 0.76 2.3 2 0.6 75 <![CDATA[6.175×10 5 ]]> 95.009 0.57 2.1 3 0.5 80 <![CDATA[6.175×10 5 ]]> 95.009 0.475 1.9 4 0.5 80 <![CDATA[6.175×10 5 ]]> 95.009 0.475 1.9 5 0.4 90 <![CDATA[6.175×10 5 ]]> 95.009 0.38 1.6

[0058] The corresponding teeth can be designed according to the specific properties of the fiber to avoid some fibers floating on the cylinder needle surface and causing "missed combing", improve the removal rate of short fibers, neps and impurities in the cotton lap, reduce the content of short fibers and neps and impurities in the combed sliver; reduce the thickness and thickness of the yarn and neps, reduce the evenness and increase the strength.

[0059] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention; the objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A method for designing the height of the cylinder teeth in a cotton spinning combing machine, characterized in that, Includes the following steps: Step 1: Calculate the number of fibers in the cross-section of the cotton roll. : ； Where W is the fiber roll weight and w is the fiber linear density. The standard moisture regain of the fiber is calculated using the weight of the fed combed fiber roll and the fiber linear density to obtain the number of fibers in the cross-section of the fiber roll. The unit of the dry weight of the fiber roll is g / m, the unit of the fiber linear density is g / 1000m, and the unit of the standard moisture regain of the fiber is %. The number of fibers in the cross-section of the fiber roll is calculated using the weight of the fed combed fiber roll and the fiber linear density. Step 2: Calculate the total cross-sectional area of ​​the transverse fibers in the cotton roll. : ； in, The fiber diameter is measured in mm. The total cross-sectional area of ​​a single fiber and the fiber roll is calculated using the fiber diameter, and then converted into the cross-sectional area of ​​the fiber on each needle tooth. Step 3: Calculate the fiber area across the width of the cylinder teeth during the combing process. : ； in, The expansion coefficient of the fiber layer during the carding process is 2-3. The thickness of the cylinder tooth base is in mm and is measured by micrometer. D is the thickness of the cylinder tooth base. Step 4: Calculate the height of the cylinder pins. : ； Where a is the width of the cylinder teeth in mm, c is the bottom width of the cylinder teeth in mm, β is the fiber filling coefficient in the needle teeth with a value of 0.65-0.

95. The height of the cylinder needle teeth is calculated by measuring the expansion coefficient of the fiber layer and the filling rate of the fiber in the cross section of the cylinder needle teeth during the carding process. The fiber filling coefficient in the needle teeth is the proportion of the fiber entering the two teeth and the gap between the teeth. The proportion is the proportion of the total fiber volume in the gap between the teeth.

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