An autolevelling device and method for ramie and wool drawing frames

Abstract

The present invention relates to an autolevelling device and method for ramie and wool drawing frames, comprising a detection device, a drafting device and an autolevelling control device; the detection device includes a pair of detection rollers, and a pressure sensor is arranged inside the detection rollers; the drafting device includes a rear roller pair, a middle roller, a pressure roller and a front roller pair, the rear roller pair includes a rear roller and a rear apron, and a rear nip is formed between the two, the front roller pair includes a front roller and a front apron, and a front nip is formed between the two; the autolevelling control device includes a first servo motor, a second servo motor, a third servo motor and a controller. In the drafting device of the autolevelling device of the present invention, the middle roller and the pressure roller are used to replace the existing comb box mechanism with complex structure and large inertia. The structure is simple, the weight is light, the load is small, it can quickly respond to speed changes, complete high-precision drafting ratio adjustment, and there will be no periodic pause, and the drafting ratio adjustment is stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of spinning machinery, and particularly relates to an autolevelling device and method for ramie and wool draw frames. Background Art

[0002] Drawing is an important link in the spinning process. Ramie and wool draw frames are key equipment in the drawing process, which are mainly used for wool spinning and ramie spinning (such as ramie spinning, short flax spinning, etc.), helping to improve the orderly arrangement of fibers and production efficiency, and being of great significance for promoting the development of the textile industry. However, in the drawing process of traditional ramie and wool draw frames, due to the unevenness of the fed sliver, the quality of the output sliver is prone to instability. To solve this problem, an autolevelling device is usually configured on the ramie and wool draw frames to automatically adjust the draft ratio according to the quantitative deviation of the fed sliver, improve the unevenness rate of the output sliver, and ensure the quality of the output sliver.

[0003] At present, ramie and wool draw frames equipped with autolevelling devices use pin-plate drafting. The comb box in the pin-plate drafting device has a large volume and large inertia, so it cannot quickly respond to the speed change of autolevelling and is difficult to achieve high-precision autolevelling. Moreover, the pin-plate generates periodic pauses during the drafting process, resulting in unstable draft ratio. Summary of the Invention

[0004] The main object of the present invention is to propose an autolevelling device and method for ramie and wool draw frames, which can effectively solve the problems in the background art.

[0005] To achieve the above object, the present invention is realized through the following technical solutions:

[0006] An autolevelling device for ramie and wool draw frames includes a detection device, a drafting device, and an autolevelling control device;

[0007] The detection device includes a pair of detection rollers, and a pressure sensor is arranged inside the detection rollers for real-time detection of the quantity of the fed sliver;

[0008] The drafting device includes a pair of back rollers, a middle roller, a pressure roller, and a pair of front rollers. The pair of back rollers includes a back roller and a back apron, and a back nip is formed between them. The pair of front rollers includes a front roller and a front apron, and a front nip is formed between them. After the fed sliver passes through the detection rollers, it is held by the back nip, then undergoes curved drafting through the middle roller and the pressure roller, and is held by the front nip and forms an output sliver for output;

[0009] The autolevelling 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. 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.

[0010] Preferably, the second servo motor is connected to the middle roller and the pressure roller through a gear set. The gear set includes a first gear and two second gears. The first gear is fixedly sleeved on the output shaft of the second servo motor. The two second gears are respectively fixedly sleeved on the middle roller and the pressure roller, and are both meshed with the first gear.

[0011] An autolevelling method for a ramie and wool type drawing frame, using the autolevelling device described in any one of the above, includes the following steps:

[0012] S1: After the feeding sliver passes through the detection roller, it is held by the rear nipper, and then undergoes curvilinear drafting through the middle roller and the pressure roller, and is held by the front nipper and forms an output sliver for output.

[0013] S2: The pressure sensor in the detection roller detects the weight per unit length of the feeding sliver 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, it controls the rotation speed of the rear roller through the first servo motor, and controls the rotation speed of the middle roller and the pressure roller through the second servo motor, so as to automatically adjust the drafting ratio.

[0014] Preferably, the weight per unit length of the feeding sliver is 5 - 15 g / m, and 6 - 12 strands are fed in at the same time.

[0015] Preferably, the diameters of both the middle roller and the pressure roller are 35 - 55 mm.

[0016] Preferably, the center distance between the middle roller and the pressure roller is 50 - 100 mm.

[0017] Preferably, 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.

[0018] 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.

[0019] Preferably, the ratio of the surface linear speeds of the middle roller and the rear roller is 1 - 1.6 times, the ratio of the surface linear speeds of the front roller and the middle roller is 4 - 12 times, and the weight per unit length of the output sliver is 5 - 15 g / m.

[0020] Preferably, the surface linear velocity of the front roller is 100 - 300 m / min.

[0021] The present invention provides an autolevelling device and method for ramie and wool drawing frames, having the following beneficial effects:

[0022] 1. When the device is in use, the pressure sensor in the detection roller detects the weight per unit length of the feeding sliver 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 rotation speed of the rear roller is controlled by the first servo motor, and the rotation speeds of the middle roller and the pressure roller are controlled by the second servo motor, so as to automatically adjust the draft multiple, improve the unevenness of the output sliver, and ensure the quality of the output sliver.

[0023] 2. In the autolevelling device of the present invention, the drafting device uses a middle roller and a pressure roller to replace the existing complex and large-inertia comb box mechanism. It has a simple structure, light weight, and small load, can quickly respond to speed changes, complete high-precision adjustment of the draft multiple, and will not produce periodic pauses, and the adjustment of the draft multiple is stable.

[0024] 3. Moreover, the middle roller and the pressure roller form a curved draft, which can form an additional friction field to effectively control floating fibers, is beneficial to improving the evenness of the sliver, and further improves the unevenness of the output sliver. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the autolevelling device of the present invention.

[0026] In the figure: 1. Feeding sliver; 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 sliver; 10. First servo motor; 11. Second servo motor; 12. Third servo motor; 13. Controller; 14. First gear; 15. Second gear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the drawings of the present invention.

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. 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.

[0031] Referring to Figure 1 , an automatic evenness control device for a flax and wool drawframe, comprising a detection device, a drafting device, and an automatic evenness control device;

[0032] The detection device includes a pair of detection rollers 2, and a pressure sensor is arranged inside the detection rollers 2 for real-time detection of the quantity of the fed sliver 1.

[0033] 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 apron 3, and a rear nip is formed therebetween. The front roller pair includes a front roller 8 and a front apron 7, and a front nip is formed therebetween. After the fed sliver 1 passes through the detection rollers 2, it is held by the rear nip, then undergoes curvilinear drafting through the middle roller 5 and the pressure roller 6, and is held by the front nip and forms an output sliver 9 for output.

[0034] The autolevelling 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. 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.

[0035] When the device is in use, the pressure sensor in the detecting roller 2 detects the weight per unit length of the feeding sliver 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 controller 13 controls the rotation speed of the rear roller 4 through the first servo motor 10 and controls the rotation speeds of the middle roller 5 and the pressure roller 6 through the second servo motor 11, so as to automatically adjust the draft multiple, improve the evenness of the output sliver 9 and ensure the quality of the output sliver 9.

[0036] When autolevelling, the rotation speed of the front roller 8 remains unchanged. When it is necessary to change the output, the controller 13 changes the speed of the front roller 8 through the third servo motor 12.

[0037] In the drafting device of the autolevelling device of the present invention, the middle roller 5 and the pressure roller 6 are adopted to replace the existing comb box mechanism with complex structure and large inertia. The structure is simple, the weight is light, the load is small, it can respond quickly to speed changes, complete the adjustment of the drafting multiple with high precision, and there will be no periodic pause, and the adjustment of the drafting multiple is stable. Moreover, the middle roller 5 and the pressure roller 6 form a curved draft, which can form an additional frictional field to effectively control the floating fibers, which is beneficial to improving the evenness of the sliver and further improving the evenness of the output sliver 9.

[0038] The second servo motor 11 is connected to the middle roller 5 and the pressure roller 6 through a gear set. 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. 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 speeds of the middle roller 5 and the pressure roller 6 can be controlled through the second servo motor 11, and the rotation speed ratio of the middle roller 5 and the pressure roller 6 is 1:1.

[0039] Preferably, the feeding rate of the feeding strip 1 is 5-15 g / m, and 4-12 strips are fed simultaneously. 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 speed of the middle roller 5 to that of the back roller 4 is 1-1.6 times, and the ratio of the surface linear speed of the front roller 8 to that of the middle roller 5 is 4-12 times. The feeding rate of the output strip 9 is 5-15 g / m. The surface linear speed of the front roller 8 is 100-300 m / min.

[0040] Example 1

[0041] The drafting and doubling of ramie strips are carried out by using the automatic evenness regulating device of the ramie and wool type drawing frame proposed by the present invention. The length of ramie fibers is 120 mm, the feeding rate of each ramie strip is 5 g / m, and the number of feeding strips is 12. The diameters of the middle roller 5 and the pressure roller 6 used are 35 mm, the roller holding distance between the back roller 4 and the front roller 8 is 320 mm, the center distance between the back roller 4 and the middle roller 5 is 150 mm, and the center distance between the middle roller 5 and the pressure roller 6 is 50 mm. The upper surface of the middle roller 5 is 1 mm higher than the upper surface of the back roller 4. The ratio of the surface linear speed of the middle roller 5 to that of the back roller 4 is 1.0 times, and the ratio of the surface linear speed of the front roller 8 to that of the middle roller 5 is 12.0 times. The feeding rate of the output strip 9 is 5.0 g / m, and the unevenness rate of the output strip 9 is 4.5%.

[0042] Example 2

[0043] The drafting and doubling of flax strips are carried out by using the automatic evenness regulating device of the ramie and wool type drawing frame proposed by the present invention. The length of flax fibers is 60 mm, the feeding rate of each flax strip is 10 g / m, and the number of feeding strips is 10. The diameters of the middle roller 5 and the pressure roller 6 used are 55 mm, the roller holding distance between the back roller 4 and the front roller 8 is 250 mm, the center distance between the back roller 4 and the middle roller 5 is 100 mm, and the center distance between the middle roller 5 and the pressure roller 6 is 100 mm. The upper surface of the middle roller 5 is 7 mm higher than the upper surface of the back roller 4. The ratio of the surface linear speed of the middle roller 5 to that of the back roller 4 is 1.2 times, and the ratio of the surface linear speed of the front roller 8 to that of the middle roller 5 is 8 times. The feeding rate of the output strip 9 is 10.4 g / m, and the unevenness rate of the output strip 9 is 4.1%.

[0044] Example 3

[0045] The drafting and doubling of the top slivers are carried out by the autolevelling device of the ramie and wool type drawing frame proposed by the present invention. The length of the wool fiber is 90 mm, the fixed quantity of each fed top sliver is 15 g / m, and the number of fed roots is 6. The diameters of the middle roller 5 and the pressure roller 6 used are 45 mm, the roller holding distance between the back roller 4 and the front roller 8 is 280 mm, the center distance between the back roller 4 and the middle roller 5 is 120 mm, and the center distance between the middle roller 5 and the pressure roller 6 is 70 mm. The upper surface of the middle roller 5 is 13 mm higher than the upper surface of the back roller 4. The ratio of the surface linear velocities of the middle roller 5 and the back roller 4 is 1.6 times, and the ratio of the surface linear velocities of the front roller 8 and the middle roller 5 is 4 times. The fixed quantity of the output sliver 9 is 14.1 g / m, and the unevenness rate of the output sliver 9 is 2.1%.

[0046] In the traditional method, gilling drafting is adopted. The unevenness rate of the output ramie sliver is about 5% - 9%, and the unevenness rate of the output wool sliver is about 3% - 4%. It can be seen from the above-mentioned Embodiment 1, Embodiment 2 and Embodiment 3 that after the drafting and doubling of the ramie sliver and the wool sliver are carried out by using the present autolevelling device, the unevenness rate of the output sliver 9 is relatively low and is lower than that of the autolevelling device using gilling drafting in the traditional method.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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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