Auto-leveling device and method for hemp and wool type drawing frame

Abstract

The invention relates to an auto-leveling device and method for a hemp and wool drawing frame. The auto-leveling device comprises a detection device, a drafting device and an auto-leveling control device, the detection device comprises a pair of detection rollers, and pressure sensors are arranged in the detection rollers; the drafting device comprises a rear roller pair, a middle roller, a pressure roller and a front roller pair, the rear roller pair comprises a rear roller and a rear leather roller, a rear jaw is formed between the rear roller and the rear leather roller, and the front roller pair comprises a front roller and a front leather roller, and a front jaw is formed between the front roller and the front leather roller; the auto-leveling control device comprises a first servo motor, a second servo motor, a third servo motor and a controller. The drafting device in the auto-leveling device adopts the middle roller and the pressure roller to replace an existing comb box mechanism which is complex in structure and large in inertia, the auto-leveling device is simple in structure, light in weight and small in load, speed changes can be quickly responded, high-precision draft multiple adjustment is completed, periodic pause is avoided, and draft multiple adjustment is stable.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning machinery, and in particular relates to a self-leveling device and method for hemp and wool drawing frames. Background Art

[0002] Drawing is an important part of the spinning process. Hemp and wool drawing frames are key equipment in the drawing process. They are mainly used for wool spinning and hemp spinning (such as ramie spinning, flax short hemp spinning, etc.), which helps to improve the orderly arrangement of fibers and improve production efficiency. They are of great significance to promoting the development of the textile industry. However, during the drawing and drafting process, the traditional hemp and wool drawing frames are prone to unstable quality of the output strips due to the unevenness of the feed strips. To solve this problem, a self-adjusting leveling device is usually installed on the hemp and wool drawing frames to automatically adjust the drafting multiple according to the quantitative deviation of the feed strips, improve the unevenness of the output strips, and ensure the quality of the output strips.

[0003] At present, the hemp and wool drawing machines equipped with autoleveling devices use needle plate drafting. The comb box in the needle plate drafting device is large in size and inertia, so it cannot respond quickly to the speed change of the autoleveling, and it is difficult to achieve high-precision autoleveling. In addition, the needle plate will periodically pause during the drafting process, resulting in unstable drafting multiples. Summary of the invention

[0004] The main purpose of the present invention is to propose a self-leveling device and method for hemp and wool drawing frames, 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 self-leveling device for hemp and wool drawing frames, comprising a detection device, a drafting device and a self-leveling control device; The detection device comprises a pair of detection rollers, wherein a pressure sensor is provided inside the detection rollers for real-time detection of the quantitative amount of the feeding strip; The drafting device comprises a rear roller pair, a middle roller, a pressure roller and a front roller pair, wherein the rear roller pair comprises a rear roller and a rear leather roller, and a rear jaw is formed between the two, and the front roller pair comprises a front roller and a front leather roller, and a front jaw is formed between the two. After the feeding strip passes through the detection roller, it is gripped by the rear jaw, and then, after being curvedly drafted by the middle roller and the pressure roller, it is gripped by the front jaw and output as an output strip; The self-adjusting and leveling control device includes a first servo motor, a second servo motor, a third servo motor and a controller. The first servo motor is used to drive the rear roller to rotate, the second servo motor is used to drive the middle roller and the pressure roller to rotate, and the third servo motor is used to drive the front roller to rotate. The controller is electrically connected to the pressure sensor, the first servo motor, the second servo motor and the third servo motor respectively.

[0006] Preferably, the second servo motor is connected to the middle roller and the pressure roller through a gear set, and the gear set includes a first gear and two second gears, the first gear is fixedly mounted on the output shaft of the second servo motor, and the two second gears are respectively fixedly mounted on the middle roller and the pressure roller, and both are meshed with the first gear.

[0007] A method for auto-leveling of a hemp or wool drawing frame, using any of the auto-leveling devices described above, comprising the following steps: S1: After the feeding strip passes through the detection roller, it is held by the rear jaw, and then it is drawn by the middle roller and the pressure roller, and then it is held by the front jaw to form an output strip for output; S2: The pressure sensor in the detection roller detects the quantitative amount of the feed strip in real time and transmits the detection signal to the controller. The controller compares the detection signal with the set standard value. According to the comparison result, the speed of the rear roller is controlled by the first servo motor, and the speed of the middle roller and the pressure roller is controlled by the second servo motor, so as to automatically adjust the drafting multiple.

[0008] Preferably, the basis weight of the feed strips is 5-15 g / m, and 6-12 strips are fed at the same time.

[0009] Preferably, the diameters of the middle roller and the pressure roller are both 35-55 mm.

[0010] Preferably, the center distance between the middle roller and the pressure roller is 50-100 mm.

[0011] Preferably, the center distance between the back roller and the front roller is 250-320 mm, and the center distance between the back roller and the middle roller is 100-150 mm.

[0012] Preferably, the upper surface of the middle roller is 0-13 mm 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.

[0013] Preferably, the ratio of the surface linear speeds of the middle roller to the rear roller is 1 to 1.6 times, the ratio of the surface linear speeds of the front roller to the middle roller is 4 to 12 times, and the basis weight of the output strip is 5 to 15 g / m.

[0014] Preferably, the surface linear speed of the front roller is 100-300 m / min.

[0015] The present invention provides a self-leveling device and method for hemp and wool drawing frames, which have the following beneficial effects: 1. When the device is in use, the pressure sensor in the detection roller detects the quantitative amount of the feeding strip in real time and transmits the detection signal to the controller. The controller compares the detection signal with the set standard value. According to the comparison result, the speed of the rear roller is controlled by the first servo motor, and the speed of the middle roller and the pressure roller is controlled by the second servo motor, so as to automatically adjust the drafting multiple, improve the unevenness of the output strip, and ensure the quality of the output strip.

[0016] 2. The drafting device in the self-adjusting and leveling device of the present invention adopts the middle roller and the pressure roller to replace the existing combing box mechanism with complicated structure and large inertia. It has a simple structure, light weight, small load, can quickly respond to speed changes, complete high-precision drafting multiple adjustment, and will not produce periodic pauses. The drafting multiple adjustment is stable.

[0017] 3. In addition, the middle roller and the pressure roller form a curved draft, which can form an additional friction force boundary, effectively control the floating fibers, and is beneficial to improve the uniformity of the strips and further improve the unevenness of the output strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the self-adjusting and leveling device of the present invention.

[0019] In the figure: 1, feeding strip; 2, detection roller; 3, rear leather roller; 4, rear roller; 5, middle roller; 6, pressure roller; 7, front leather roller; 8, front roller; 9, output strip; 10, first servo motor; 11, second servo motor; 12, third servo motor; 13, controller; 14, first gear; 15, second gear. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] Reference Figure 1 , a self-leveling device for hemp and wool type drawing frame, comprising a detection device, a drafting device and a self-leveling control device; The detection device comprises a pair of detection rollers 2, wherein a pressure sensor is provided inside the detection rollers 2 for real-time detection of the quantitative amount of the feeding strip 1; The drafting device includes a rear roller pair, a middle roller 5, a pressure roller 6 and a front roller pair. The rear roller pair includes a rear roller 4 and a rear leather roller 3, and a rear jaw is formed between the two. The front roller pair includes a front roller 8 and a front leather roller 7, and a front jaw is formed between the two. After the feeding strip 1 passes through the detection roller 2, it is gripped by the rear jaw, and then after being curvedly drafted by the middle roller 5 and the pressure roller 6, it is gripped by the front jaw and forms an output strip 9 for output; The self-adjusting and leveling control device includes a first servo motor 10, a second servo motor 11, a third servo motor 12 and a controller 13. The first servo motor 10 is used to drive the rear roller 4 to rotate, the second servo motor 11 is used to drive the middle roller 5 and the pressure roller 6 to rotate, and the third servo motor 12 is used to drive the front roller 8 to rotate. The controller 13 is electrically connected to the pressure sensor, the first servo motor 10, the second servo motor 11 and the third servo motor 12 respectively.

[0025] When the device is in use, the pressure sensor in the detection roller 2 detects the quantity of the feed strip 1 in real time and transmits the detection signal to the controller 13. The controller 13 compares the detection signal with the set standard value. According to the comparison result, the rotation speed of the rear roller 4 is controlled by the first servo motor 10, and the rotation speed of the middle roller 5 and the pressure roller 6 is controlled by the second servo motor 11, so as to automatically adjust the drafting multiple, improve the unevenness of the output strip 9, and ensure the quality of the output strip 9.

[0026] During the self-leveling process, the rotation speed of the front roller 8 remains unchanged. When the output needs to be changed, the controller 13 changes the speed of the front roller 8 through the third servo motor 12.

[0027] The drafting device in the self-leveling device of the present invention adopts the middle roller 5 and the pressure roller 6 to replace the existing combing box mechanism with complicated structure and large inertia. It has simple structure, light weight, small load, can quickly respond to speed changes, complete high-precision drafting multiple adjustment, and will not produce periodic pauses. The drafting multiple adjustment is stable. In addition, the middle roller 5 and the pressure roller 6 form a curved drafting, which can form an additional friction force boundary, effectively control the floating fibers, and is conducive to improving the uniformity of the strip dryness, and further improves the unevenness of the strip dryness of the output strip 9.

[0028] The second servo motor 11 is connected to the middle roller 5 and the pressure roller 6 through a gear set, and the gear set includes a first gear 14 and two second gears 15. The first gear 14 is fixedly sleeved on the output shaft of the second servo motor 11, and the two second gears 15 are respectively fixedly sleeved on the middle roller 5 and the pressure roller 6, and are both meshed with the first gear 14. In this way, the rotation speed of the middle roller 5 and the pressure roller 6 can be controlled by the second servo motor 11, and the rotation speed ratio of the middle roller 5 and the pressure roller 6 is 1:1.

[0029] Preferably, the quantitative feeding strip 1 is 5-15 g / m, and 4-12 strips are fed at the same time. The diameters of the middle roller 5 and the pressure roller 6 are both 35-55 mm. The center distance between the middle roller 5 and the pressure roller 6 is 50-100 mm. The center distance between the back roller 4 and the front roller 8 is 250-320 mm, and the center distance between the back roller 4 and the middle roller 5 is 100-150 mm. The upper surface of the middle roller 5 is 0-13 mm higher than the upper surface of the back roller 4, and the lower surface of the pressure roller 6 is flush with the upper surface of the front roller 8. The ratio of the surface linear velocity of the middle roller 5 to the back roller 4 is 1-1.6 times, and the ratio of the surface linear velocity of the front roller 8 to the middle roller 5 is 4-12 times. The quantitative output strip 9 is 5-15 g / m. The surface linear velocity of the front roller 8 is 100-300 m / min.

[0030] Example 1

[0031] The self-adjusting and leveling device of the hemp and wool type drawing frame proposed by the present invention is used to draw and combine the ramie strips. The length of the ramie fiber is 120mm, the basis weight of each ramie strip fed is 5g / m, and the number of fed strips is 12. The diameter of the middle roller 5 and the pressure roller 6 used is 35mm, the roller holding distance between the rear roller 4 and the front roller 8 is 320mm, the center distance between the rear roller 4 and the middle roller 5 is 150mm, and the center distance between the middle roller 5 and the pressure roller 6 is 50mm. The upper surface of the middle roller 5 is 1mm higher than the upper surface of the rear roller 4. The ratio of the surface linear velocity of the middle roller 5 to the rear roller 4 is 1.0 times, the ratio of the surface linear velocity of the front roller 8 to the middle roller 5 is 12.0 times, the basis weight of the output strip 9 is 5.0g / m, and the unevenness of the output strip 9 is 4.5%.

[0032] Example 2

[0033] The self-adjusting and leveling device of the hemp and wool type drawing frame proposed by the present invention is used to draw and combine the flax strips. The length of the flax fiber is 60mm, the quantitative weight of each fed flax strip is 10g / m, and the number of fed strands is 10. The diameter of the middle roller 5 and the pressure roller 6 used is 55mm, the roller holding distance between the rear roller 4 and the front roller 8 is 250mm, the center distance between the rear roller 4 and the middle roller 5 is 100mm, and the center distance between the middle roller 5 and the pressure roller 6 is 100mm. The upper surface of the middle roller 5 is 7mm higher than the upper surface of the rear roller 4. The ratio of the surface linear velocity of the middle roller 5 to the rear roller 4 is 1.2 times, the ratio of the surface linear velocity of the front roller 8 to the middle roller 5 is 8 times, the quantitative weight of the output strip 9 is 10.4g / m, and the unevenness of the output strip 9 is 4.1%.

[0034] Example 3

[0035] The self-adjusting and leveling device of the hemp and wool type drawing frame proposed by the present invention is used to draw and combine the wool tops. The wool fiber length is 90mm, the basis weight of each fed wool top is 15g / m, and the number of fed tops is 6. The diameters of the middle roller 5 and the pressure roller 6 used are 45mm, the roller holding distance between the rear roller 4 and the front roller 8 is 280mm, the center distance between the rear roller 4 and the middle roller 5 is 120mm, and the center distance between the middle roller 5 and the pressure roller 6 is 70mm. The upper surface of the middle roller 5 is 13mm higher than the upper surface of the rear roller 4. The ratio of the surface linear velocity of the middle roller 5 to the rear roller 4 is 1.6 times, the ratio of the surface linear velocity of the front roller 8 to the middle roller 5 is 4 times, the basis weight of the output strip 9 is 14.1g / m, and the unevenness of the output strip 9 is 2.1%.

[0036] Traditionally, needle-comb drafting is used, and the unevenness of the output flax strips is about 5% - 9%, and the unevenness of the output wool strips is about 3% - 4%. According to the above-mentioned embodiments 1, 2 and 3, it can be seen that after the flax strips and wool strips are stretched and combined by the self-adjusting leveling device, the unevenness of the output strips 9 is relatively low, which is lower than that of the traditional self-adjusting leveling device using needle plate drafting.

[0037] 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 self-leveling device for hemp and wool drawing frames, characterized in that: It includes a detection device, a drafting device and a self-leveling control device; The detection device comprises a pair of detection rollers, wherein a pressure sensor is provided inside the detection rollers for real-time detection of the quantitative amount of the feeding strip; The drafting device comprises a rear roller pair, a middle roller, a pressure roller and a front roller pair, wherein the rear roller pair comprises a rear roller and a rear leather roller, and a rear jaw is formed between the two, and the front roller pair comprises a front roller and a front leather roller, and a front jaw is formed between the two. After the feeding strip passes through the detection roller, it is gripped by the rear jaw, and then, after being curvedly drafted by the middle roller and the pressure roller, it is gripped by the front jaw and output as an output strip; The self-adjusting and leveling control device includes a first servo motor, a second servo motor, a third servo motor and a controller. The first servo motor is used to drive the rear roller to rotate, the second servo motor is used to drive the middle roller and the pressure roller to rotate, and the third servo motor is used to drive the front roller to rotate. The controller is electrically connected to the pressure sensor, the first servo motor, the second servo motor and the third servo motor respectively.

2. The self-leveling device for hemp and wool drawing frame according to claim 1, characterized in that: The second servo motor is connected to the middle roller and the pressure roller through a gear set, and the gear set includes a first gear and two second gears. The first gear is fixedly mounted on the output shaft of the second servo motor, and the two second gears are respectively fixedly mounted on the middle roller and the pressure roller, and are both meshed with the first gear.

3. A method for auto-leveling a hemp or wool drawing frame, using the auto-leveling device according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1: After the feeding strip passes through the detection roller, it is held by the rear jaw, and then it is drawn by the middle roller and the pressure roller, and then it is held by the front jaw to form an output strip for output; S2: The pressure sensor in the detection roller detects the quantitative amount of the feed strip in real time and transmits the detection signal to the controller. The controller compares the detection signal with the set standard value. According to the comparison result, the speed of the rear roller is controlled by the first servo motor, and the speed of the middle roller and the pressure roller is controlled by the second servo motor, so as to automatically adjust the drafting multiple.

4. The method for self-leveling of a hemp and wool drawing frame according to claim 3, characterized in that: The quantitative feeding strips are 5~15g / m, and 6~12 strips are fed at the same time.

5. The method for self-leveling of a hemp and wool drawing frame according to claim 3, characterized in that: The diameters of the middle roller and the pressure roller are both 35-55 mm.

6. The method for self-leveling of hemp and wool drawing frames according to claim 3, characterized in that: The center distance between the middle roller and the pressure roller is 50-100 mm.

7. The method for self-leveling of hemp and wool drawing frames according to claim 3, characterized in that: The center distance between the rear roller and the front roller is 250-320 mm, and the center distance between the rear roller and the middle roller is 100-150 mm.

8. The method for self-leveling of hemp and wool drawing frames according to claim 3, characterized in that: The upper surface of the middle roller is 0-13 mm 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.

9. The method for self-leveling of hemp and wool drawing frames according to claim 3, 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 basis weight of the output strip is 5 to 15 g / m.

10. The method for self-leveling of hemp and wool drawing frames according to claim 3, characterized in that: The surface linear speed of the front roller is 100-300 m / min.

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