Drafting device for drawing hemp and wool fibers

Abstract

The invention relates to a drafting device for hemp and wool fiber drawing, which comprises a rear roller pair, a middle roller, a pressure roller and a front roller pair which are sequentially arranged along a fiber rod drafting path, the rear roller pair comprises a rear roller and a rear leather roller, the front roller pair comprises a front roller and a front leather roller, the middle roller supports a fiber rod, and the pressure roller supports the front roller. And the pressure roller presses down the fiber rod. According to the device, curve drafting is formed on ramie strips or wool strips through the middle roller and the pressure roller, the structure is simpler, the high-speed requirement of a drawing frame can be met, fibers cannot be damaged, an additional friction force field can be formed through the middle roller and the pressure roller, floating fibers are effectively controlled, and the evenness of yarn levelness can be improved. According to the device, the rotatable middle roller and the pressure roller are adopted, mutation of friction force between the middle roller and the pressure roller and fibers can be reduced through the rotating middle roller and the pressure roller, the fibers can be held more softly and effectively in a drafting area, and uneven yarn evenness caused by drafting is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning machinery, and in particular relates to a drafting device for drawing hemp and wool fibers. Background Art

[0002] The length of hemp and wool fibers is long and uneven. The traditional drawing method of hemp and wool mainly adopts needle board drawing and leather board drawing to take into account the control of the movement of long and short fibers during drawing. However, during the needle board drawing process, the needle board will damage the fiber when it penetrates the fiber layer, and the fibers will be entangled with each other. In addition, the mechanism of needle board drafting is complicated, and the production speed of the drawing (needling) machine is limited by the up and down movement of the needle board. When the speed is high, the screw head has a strong impact on the needle board, which is easy to cause damage to the machine parts. Therefore, the output speed of the front roller of the needle carding machine is only 60~70m / min, which seriously affects the production efficiency. Although the leather board drafting eliminates the combing box and is more suitable for high speed, the leather board is made of rubber material. The friction between the fiber and the leather board is greater than the friction between the fibers, causing the fiber in direct contact with the leather board to change quickly, while the fiber not in contact with the leather board changes slowly. Therefore, when the fiber strip is thicker, the fibers in the middle layer are prone to speed differences with the fibers in the upper and lower layers (the fiber layers in contact with the upper and lower leather boards), resulting in layered movement. In addition, the drafting leather board is usually made of rubber with poor conductivity, and mutual friction is prone to generate static electricity, which can cause the fibers to entangle with each other or wrap around the machine parts.

[0003] In the cotton spinning drafting, pressure bar drafting has been widely used. The position of the pressure bar in this drafting device is adjustable, and the fiber movement can be controlled by adjusting the additional friction force. The traditional pressure bar drafting is a pressure bar, and the pressure bar is a non-rotating metal bar. The pressure bar drafting has the advantages of simple structure and high drafting efficiency. In the cotton spinning pressure bar drafting, there is only one pressure bar in the drafting area, which is only suitable for short fibers. However, if similar drafting devices can be improved and applied to the drafting of hemp and wool fibers, it will provide an efficient and low-damage drafting method for the drawing processing of hemp and wool fibers, and promote the technological progress and sustainable development of the hemp and wool fiber textile industry. Summary of the invention

[0004] The main purpose of the present invention is to propose a drafting device for hemp and wool fiber drawing, which can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A drafting device for hemp and wool fiber drawing comprises a rear roller pair, a middle roller, a pressure roller and a front roller pair which are sequentially arranged along the fiber strip drawing path. The rear roller pair comprises a rear roller and a rear leather roller, a rear jaw is formed therebetween for holding the feeding end of the fiber strip. The front roller pair comprises a front roller and a front leather roller, a front jaw is formed therebetween for holding the output end of the fiber strip. The middle roller lifts up the fiber strip, and the pressure roller presses down the fiber strip, thereby forming a curved draft on the fiber strip.

[0006] Preferably, the basis weight of each fiber strip fed into the rear jaw is 5-20 g / m, and 4-12 fibers are fed simultaneously.

[0007] Preferably, the diameters of the middle roller and the pressure roller are both 35-55 mm.

[0008] Preferably, the center distance b between the middle roller and the pressure roller is 50-100 mm.

[0009] Preferably, the center distance between the back roller and the front roller is 250-320 mm, and the center distance a between the back roller and the middle roller is 100-150 mm.

[0010] Preferably, the upper surface of the middle roller is higher than the upper surface of the rear roller, and the lower surface of the pressure roller is flush with the upper surface of the front roller.

[0011] Preferably, the upper surface of the middle roller is 0-15 mm higher than the upper surface of the rear roller.

[0012] Preferably, the ratio of the surface linear speeds of the middle roller and the rear roller is 1 to 1.6 times, the ratio of the surface linear speeds of the front roller and the middle roller is 4 to 12 times, and the quantitative weight of the fiber strips output from the front jaw is 5 to 20 g / m.

[0013] Preferably, the surface linear speed of the front roller is 120-300 m / min.

[0014] The present invention provides a drafting device for hemp and wool fiber drawing, which has the following beneficial effects: 1. This device forms a curved draft on the flax or wool strips through the middle roller and the pressure roller. Compared with the traditional needle plate drafting and leather plate drafting, the structure is simpler, which can meet the high-speed requirements of the drawing frame, has high production efficiency, and will not damage the fibers. In addition, the middle roller and the pressure roller can form an additional friction force boundary to effectively control the floating fibers, which is beneficial to improve the uniformity of the strips.

[0015] 2. The hyperbolic drafting of the rollers and pressure rollers in this device can lengthen the control range of the fibers, taking into account both long and short fibers, and is more suitable for combined drafting of hemp and wool (especially hemp, because the length of hemp is more uneven than that of wool).

[0016] 3. This device uses a rotating middle roller and a pressure roller. The rotating middle roller and the pressure roller can reduce the sudden change of friction between the fibers, so that the fibers are held more gently and effectively in the drafting area, reducing the unevenness of the fibers caused by the drafting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the drafting device of the present invention.

[0018] In the figure: 1, fiber strip; 2, rear leather roller; 3, rear roller; 4, middle roller; 5, pressure roller; 6, front leather roller; 7, front roller. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Reference Figure 1 A drafting device for hemp and wool fiber drawing, comprising a rear roller pair, a middle roller 4, a pressure roller 5 and a front roller pair arranged in sequence along the drafting path of the fiber strip 1, the rear roller pair comprising a rear roller 3 and a rear leather roller 2, a rear jaw formed therebetween for holding the feeding end of the fiber strip 1, the middle roller 4 supports the fiber strip 1, the pressure roller 5 presses down the fiber strip 1, forming a curved draft for the fiber strip 1, the front roller pair comprising a front roller 7 and a front leather roller 6, a front jaw formed therebetween for holding the output end of the fiber strip 1.

[0024] The device is mainly used for drawing flax and wool fibers. The fiber strip 1 is flax or wool, which is fed from the rear jaw and output from the front jaw after being drawn by the middle roller 4 and the pressure roller 5.

[0025] This device forms a curved drafting on the flax strips or wool strips through the middle roller 4 and the pressure roller 5. Compared with the traditional needle plate drafting and leather plate drafting, the structure is simpler, can meet the high-speed requirements of the drawing frame, has high production efficiency, and will not cause damage to the fibers. In addition, an additional friction force boundary can be formed by the middle roller 4 and the pressure roller 5 to effectively control the floating fibers, which is beneficial to improving the uniformity of the strips.

[0026] Compared with the traditional pressure bar drafting, which is a pressure bar and a non-rotating metal bar, the hyperbolic drafting of rollers 4 and pressure rollers 5 in this device can lengthen the control range of the fibers while taking into account both long and short fibers, and is more suitable for the combined drafting of hemp and wool with uneven lengths.

[0027] In addition, the cohesion of hemp fibers is poor, and holes are easily formed in the hemp net during the drawing process. If a traditional fixed and non-rotating pressure rod is used, the fibers may be unevenly drawn due to the sudden increase or decrease in friction when passing through. Therefore, the device adopts a rotatable middle roller 4 and a pressure roller 5. The rotating middle roller 4 and the pressure roller 5 can reduce the sudden change of friction between the fibers, so that the fibers are held more gently and effectively in the drawing area, reducing the unevenness of the fibers caused by the drawing.

[0028] Preferably, the basis weight of each fiber strip 1 fed into the rear jaw is 5-20 g / m, and 4-12 fibers are fed at the same time. The diameters of the middle roller 4 and the pressure roller 5 are both 35-55 mm, the center distance b between the middle roller 4 and the pressure roller 5 is 50-100 mm, the center distance between the rear roller 3 and the front roller 7 is 250-320 mm, the center distance a between the rear roller 3 and the middle roller 4 is 100-150 mm, the upper surface of the middle roller 4 is higher than the upper surface of the rear roller 3, specifically, the upper surface of the middle roller 4 is 0-15 mm higher than the upper surface of the rear roller 3, and curved drafting is formed by the height difference; because The center distance between the middle roller 4 and the pressure roller 5 is relatively small. If the middle roller 4 is higher than the rear jaw and the pressure roller 5 is lower than the front jaw, the fiber strip 1 will form an excessively long encircling arc on the middle roller 4 and the pressure roller 5, which is not conducive to the movement of the fiber. Therefore, the lower surface of the pressure roller 5 is set to be flush with the upper surface of the front roller 7; the ratio of the surface linear speed of the middle roller 4 to the rear roller 3 is 1~1.6 times, and the ratio of the surface linear speed of the front roller 7 to the middle roller 4 is 4~12 times. The quantitative weight of the fiber strip 1 output from the front jaw is 5~20g / m, and the surface linear speed of the front roller 7 (strip output speed) is 120~300m / min.

[0029] Example 1

[0030] The drafting device proposed by the present invention is used to draft and combine ramie strips, the length of ramie fiber is 120mm, the basis weight of each ramie strip fed is 5g / m, and the number of ramie strips fed is 12. The diameter of the middle roller 4 and the pressure roller 5 used is 35mm, the center distance between the middle roller 4 and the pressure roller 5 is 100mm, and the roller holding distance between the rear roller 3 and the front roller 7 is 320mm. The upper surface of the middle roller 4 is 1mm higher than the upper surface of the rear roller 3. The ratio of the surface linear velocity of the pressure roller 5 to the rear roller 3 is 1.0 times, and the ratio of the surface linear velocity of the front roller 7 to the middle roller 4 is 12.0 times. The output strip basis weight is 5.0g / m, and the output speed is 210m / min.

[0031] Example 2

[0032] The flax strips are stretched and combined by the pressure roller 5 drafting device proposed in the present invention. The length of the flax fiber is 100 mm, the basis weight of each fed flax strip is 16 g / m, and the number of fed flax strips is 10. The diameter of the middle roller 4 and the pressure roller 5 used is 45 mm, the center distance between the middle roller 4 and the pressure roller 5 is 70 mm, and the roller holding distance between the rear roller 3 and the front roller 7 is 280 mm. The upper surface of the middle roller 4 is 7 mm higher than the upper surface of the rear roller 3. The ratio of the surface linear velocity of the pressure roller 5 to the rear roller 3 is 1.2 times, and the ratio of the surface linear velocity of the front roller 7 to the middle roller 4 is 6.7 times. The output strip basis weight is 20 g / m, and the output speed is 120 m / min.

[0033] Example 3

[0034] The pressure roller 5 drafting device proposed by the present invention is used to draft and combine the wool strips. The wool fiber length is 90mm, the basis weight of each fed wool strip is 20g / m, and the number of fed strands is 4. The diameter of the middle roller 4 and the pressure roller 5 used is 55mm, the center distance between the middle roller 4 and the pressure roller 5 is 50mm, and the roller holding distance between the rear roller 3 and the front roller 7 is 250mm. The upper surface of the middle roller 4 is 15mm higher than the upper surface of the rear roller 3. The ratio of the surface linear velocity of the pressure roller 5 to the rear roller 3 is 1.6 times, and the ratio of the surface linear velocity of the front roller 7 to the middle roller 4 is 5 times. The output strip basis weight is 10.0g / m, and the strip output speed is 300m / min.

[0035] It can be seen from the above-mentioned embodiments 1, 2 and 3 that after the present device is used to draw and combine flax strips and wool strips, the production efficiency is greatly improved.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drafting device for drawing hemp and wool fibers, characterized in that: It includes a rear roller pair, a middle roller, a pressure roller and a front roller pair which are arranged in sequence along the fiber strip stretching path. The rear roller pair includes a rear roller and a rear leather roller, and a rear jaw is formed therebetween for holding the feeding end of the fiber strip. The front roller pair includes a front roller and a front leather roller, and a front jaw is formed therebetween for holding the output end of the fiber strip. The middle roller supports the fiber strip, and the pressure roller presses the fiber strip downward, thereby forming a curved stretching for the fiber strip.

2. A drafting device for hemp and wool fiber drawing according to claim 1, characterized in that: The basis weight of each fiber strip fed into the rear jaw is 5 to 20 g / m, and 4 to 12 fibers are fed simultaneously.

3. A drafting device for hemp and wool fiber drawing according to claim 1, characterized in that: The diameters of the middle roller and the pressure roller are both 35-55 mm.

4. A drafting device for hemp and wool fiber drawing according to claim 1, characterized in that: The center distance b between the middle roller and the pressure roller is 50-100 mm.

5. A drafting device for hemp and wool fiber drawing according to claim 1, characterized in that: The center distance between the back roller and the front roller is 250-320 mm, and the center distance a between the back roller and the middle roller is 100-150 mm.

6. A drafting device for hemp and wool fiber drawing according to claim 1, characterized in that: The upper surface of the middle roller is higher than the upper surface of the rear roller, and the lower surface of the pressure roller is flush with the upper surface of the front roller.

7. A drafting device for hemp and wool fiber drawing according to claim 6, characterized in that: The upper surface of the middle roller is 0-15 mm higher than the upper surface of the rear roller.

8. A drafting device for hemp and wool fiber drawing according to claim 1, characterized in that: The ratio of the surface linear speeds of the middle roller and the rear roller is 1 to 1.6 times, the ratio of the surface linear speeds of the front roller and the middle roller is 4 to 12 times, and the quantitative weight of the fiber strip output from the front jaw is 5 to 20 g / m.

9. A drafting device for hemp and wool fiber drawing according to claim 1, characterized in that: The surface linear speed of the front roller is 120-300 m / min.

Images