Design method for height of cylinder tooth piece of cotton spinning comber

Abstract

The invention relates to the technical field of cotton spinning comber cylinders, and discloses a cotton spinning comber cylinder tooth sheet height design method which comprises the steps of calculating the number of fibers on the cross section of a lap, calculating the total area of the cross section of transverse fibers in the lap, calculating the area of fibers on the width of a cylinder tooth sheet in the carding process and calculating the height value of cylinder needle teeth. Step 1, calculating the number of fibers on the cross section of a lap; 2, calculating the total area of cross sections of transverse fibers in the cotton rolls; 3, calculating the fiber area on the width of a cylinder tooth piece in the carding process; and 4, calculating the height value of the cylinder needle teeth. Corresponding tooth pieces can be made according to specific attributes of fibers, so that the problem of missed combing can be effectively solved, and the combing effect on the fibers is improved.

Description

Technical Field

[0001] The invention relates to the technical field of a cotton spinning combing machine cylinder, in particular to a method for designing the height of a cotton spinning combing machine cylinder tooth piece. Background Art

[0002] The cotton combing machine combs the fiber bundle by piercing the cylinder needle teeth into the fiber bundle, removes the cotton knots, short fibers and impurities in the fiber bundle, and separates, straightens and makes the fibers in the fiber bundle parallel, thereby greatly improving the quality of yarn and fabrics, improving the style of yarn and fabrics, and realizing the high-end yarn and fabric products. The height of the cylinder needle teeth of the cotton combing machine is an important parameter affecting the combing quality. When the height of the cylinder needle teeth is too small, the needle teeth cannot completely penetrate the fiber layer during the combing process of the cylinder, that is, some fibers will float on the cylinder needle surface and "miss the comb" will occur; if the height of the cylinder needle teeth is too large, it will affect the density of the needle teeth. In addition, the combing area where the cylinder needle teeth are located is different (such as Figure 1 ), because the separation, parallelism and straightness of the fibers during combing are different, the extrusion force and combing force between the needle teeth and the fibers during cylinder combing are different, so the requirements for the height of the cylinder needle teeth are also different. At present, the design of the height of the cylinder needle teeth of the cotton spinning combing machine is basically determined based on production practice experience, and a systematic design theory and design method have not yet been formed; especially when using more than two kinds of mixed combing fibers, the design or selection of cylinder needle teeth is a problem that plagues combing production.

[0003] In the patent with announcement number CN201220108051, a cotton spinning combing machine variable speed combing cylinder needle tooth arrangement structure is disclosed, wherein the variable speed combing cylinder has a plurality of needle teeth arranged along its axial direction arranged at intervals on the outer side of the circular arc, and the needle tooth density on both sides of the variable speed combing cylinder in the circumferential direction is greater than the needle density in the middle of the variable speed combing cylinder in the circumferential direction. When combing, this cylinder cannot be adapted according to the corresponding fiber, and when combing, it is easy to miss the combing, which seriously affects the combing effect of the fiber.

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

[0005] In order to solve the above problems, the present invention discloses a design method for the height of the cylinder teeth of a cotton spinning combing machine. The corresponding teeth can be formulated according to the fiber dry weight, fiber linear density, and fiber standard moisture regain of the fiber. This can effectively solve the problem of missed combing and improve the combing effect of the fibers.

[0006] The technical solution of the present invention is: a design method for 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 dry basis weight of the fiber roll, w is the fiber linear density, and ε is the fiber normal moisture regain. The number of fibers in the cross section of the fiber roll is calculated using the basis 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 lap A :

[0011]

[0012] Wherein, d0 is the fiber diameter, and its unit is mm. The fiber diameter is used to calculate the total fiber area of ​​the cross section of a single fiber and a fiber roll, and then converted into the fiber cross-sectional area on each needle tooth section;

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

[0014]

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

[0016] Step 4: Calculate the cylinder needle tooth height h:

[0017]

[0018] Wherein, 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 of the fiber in the needle tooth.

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

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

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

[0022] Preferably, in step 4, a is the width of the cylinder tooth piece, and its unit is mm, c is the bottom width of the cylinder tooth piece, and its unit is mm, β is the fiber filling coefficient of the fiber in the needle tooth, and its value is 0.65-0.95. The expansion coefficient of the fiber layer during the combing process and the filling rate of the fiber in the cross section of the cylinder needle tooth are measured to calculate the height of the cylinder needle tooth.

[0023] Preferably, the fiber filling coefficient of the fibers in the needle teeth is the proportion of the fibers entering the two tooth plates and the gaps between the teeth, and the proportion is the ratio of the total volume of the fibers to the gaps between the teeth.

[0024] The benefits of the present invention are as follows: 1. The present invention calculates the height of the tooth according to the number of fibers in the cross section of the cotton roll, the total area of ​​the transverse fiber cross section in the cotton roll, and the fiber area on the width of the cylinder tooth during the combing process. The cylinder needle teeth with this tooth height can completely pierce the fiber layer to avoid "missing combing" due to some fibers floating on the cylinder needle surface, thereby fully combing the fibers and improving the combing effect of the cylinder on the fibers.

[0025] 2. The present invention is conducive to the full puncture and loosening of the fiber bundle by the cylinder needle teeth, so as to better remove the cotton knots, impurities and short fibers in the fiber bundle, improve the parallelism, straightness and separation of the fibers, reduce the cotton knots, thick sections and details in the yarn, reduce the hairiness, improve the yarn strength, and greatly improve the yarn quality.

[0026] 3. The present invention can achieve full combing of fibers by calculating the height of the teeth for different types of fibers, thereby improving the combing effect of fibers, increasing the removal rate of short fibers, cotton knots and impurities in cotton rolls, and reducing the content of short fibers and cotton knot impurities in combed strips; reducing the coarse and fine sections and cotton knots of the yarn, reducing the unevenness of the yarn, and improving the strength. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 2 It is a schematic structural diagram of the cylinder tooth piece of the present invention.

[0029] Among them: 1. tooth piece, 2. needle plate, 3. cylinder body, 4. cylinder shaft. DETAILED DESCRIPTION

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

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

[0032] The following steps are involved:

[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 lap A :

[0036]

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

[0038]

[0039] Step 4: Calculate the cylinder needle tooth height h:

[0040]

[0041] In step 1, W is the dry weight of the fiber roll (g / m), w is the fiber linear density (g / 1000m), ε is the fiber normal moisture regain (%), and 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 fiber diameter is used to calculate the total fiber area of ​​a single fiber and the cross-section of a fiber roll, and then converted into the fiber cross-sectional area on each needle tooth section.

[0043] In step 3, γ is the fiber expansion coefficient of the fiber layer during the combing process, which is 2-3, and D is the base thickness 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), β is the fiber filling coefficient of the fiber in the needle teeth, and its value is 0.65-0.95. The height of the cylinder needle teeth is calculated by measuring the expansion coefficient of the fiber layer during the combing process and the filling rate of the fiber in the cross section of the cylinder needle teeth.

[0045] Figure 1 The middle tooth piece 1 is located on the needle plate 2 , the needle plate 2 is located on the periphery of the cylinder body 3 , and a cylinder shaft 4 is provided at the center position inside the cylinder body 3 .

[0046] The height h of the tooth plate 1 on the cylinder body 4 is the distance from the top of the tooth plate to the bottom of the tooth plate.

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

[0048] The following takes the design of the 5 combing zones of the cylinder of a cotton spinning combing machine as an example to illustrate the design method of the cylinder needle tooth height:

[0049] Example 1

[0050] It is known that the dry basis weight W of the cotton fiber roll is 75g / m, the linear density w of the cotton fiber is 0.15tex, the standard moisture regain ε of the cotton fiber is 8.5%, and the diameter d0 of the cotton fiber is 18×10 -3 mm, the width a of the cylinder tooth tip is 0.06 mm, the width c of the cylinder needle gap bottom is 0.2 mm, the expansion coefficient γ of the cotton layer during the combing process is measured to be 2.5, the base thickness D of the cylinder needle teeth in the 1st to 5th combing areas and the filling coefficient β of the fibers in the needle teeth are shown in Table 1.

[0051] The calculation is performed as follows: (1) Calculate the number of fibers in the cross-section of the cotton roll M, see Table 1; (2) Calculate the total cross-sectional area of ​​the fibers in the cotton roll s A The values ​​are shown in Table 1; (3) Calculate the fiber area s on the width of the cylinder tooth 1 in each combing zone a See Table 1; (4) Calculate the height h of the cylinder needle teeth in different carding areas and see Table 1.

[0052] Table 1

[0053] Combing 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] It is known that the dry basis weight W of the long-staple cotton fiber roll is 70g / m, the linear density w of the cotton fiber is 0.123tex, the official moisture regain ε of the cotton fiber is 8.5%, the diameter d_0 of the cotton fiber is 1410-3mm, the width a of the cylinder tooth tip is 0.06mm, the bottom width c of the cylinder needle gap is 0.2mm, and the expansion coefficient γ of the cotton layer during the combing process is measured to be 3. The base thickness D of the cylinder needle teeth in the 1st to 5th combing areas and the fiber filling coefficient β in the needle teeth are shown in Table 2.

[0056] Table 2

[0057] Combing 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 made according to the specific properties of the fiber to avoid some fibers floating on the surface of the cylinder needle and "missing the comb", improve the removal rate of short fibers, neps and impurities in the cotton rolls, and reduce the content of short fibers and neps impurities in the combed strips; reduce the thick and thin sections and neps of the yarn, reduce the unevenness of the yarn, and improve the strength.

[0059] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A design method for the height of cylinder teeth of a cotton spinning combing machine, characterized in that: The following steps are involved: Step 1: Calculate the number of fibers M in the cross section of the cotton roll: Where W is the dry basis weight of the fiber roll, w is the fiber linear density, ε is the fiber normalized moisture regain, and the number of fibers in the cross section of the fiber roll is calculated using the basis weight and fiber linear density of the fed combed fiber roll. Step 2: Calculate the total cross-sectional area s of the transverse fibers in the lap A : Wherein, d0 is the fiber diameter, and its unit is mm. The fiber diameter is used to calculate the total fiber area of ​​the cross section of a single fiber and a fiber roll, and then converted into the fiber cross-sectional area on each needle tooth section; Step 3: Calculate the fiber area s on the width of the cylinder teeth during the carding process a : Among them, β is the expansion coefficient of the fiber layer during the combing process, and D is the base thickness of the cylinder tooth plate; Step 4: Calculate the cylinder needle tooth height h: Among them, a is the width of the cylinder tooth (mm), c is the bottom width of the cylinder tooth (mm), and β is the filling coefficient of the fiber in the needle tooth.

2. The method for designing the height of the cylinder teeth of a cotton spinning combing machine according to claim 1, characterized in that: The unit of the dry weight of the fiber roll in step 1 is g / m, the unit of the fiber linear density is g / 1000m, the unit of the fiber normal regain is %, and 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.

3. The method for designing the height of cylinder teeth of a cotton spinning combing machine according to claim 1, characterized in that: The unit of the fiber diameter in step 2 is mm. The fiber diameter is used to calculate the total fiber area of ​​the cross section of a single fiber and a fiber roll, and then converted into the fiber cross-sectional area on each needle tooth section.

4. The method for designing the height of cylinder teeth of a cotton spinning combing machine according to claim 1, characterized in that: The fiber expansion coefficient in step 3 is 2-3, and the thickness of the cylinder tooth base is in mm, which is measured by a micrometer.

5. The method for designing the height of cylinder teeth of a cotton spinning combing machine according to claim 1, characterized in that: In step 4, a is the width of the cylinder tooth plate, and its unit is mm; c is the bottom width of the cylinder tooth plate, and its unit is mm; β is the fiber filling coefficient of the fiber in the needle tooth, and its value is 0.65-0.

95. The expansion coefficient of the fiber layer during the combing process and the fiber filling rate in the cross section of the cylinder needle tooth are measured to calculate the height of the cylinder needle tooth.

6. The method for designing the height of cylinder teeth of a cotton spinning combing machine according to claim 5, characterized in that: The filling coefficient of the fiber in the needle teeth is the proportion of the fiber entering the two tooth plates and the gap between the teeth, and the proportion is the ratio of the total volume of the fiber to the gap between the teeth.

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