Auto-leveling system and method for drawing frame

Abstract

The invention discloses an auto-leveling system and method for a drawing frame. The auto-leveling system comprises a feeding system, a drafting mechanism, a detection system, a driving system, a control unit and the drawing frame which are sequentially arranged in the running direction of cotton slivers. A middle roller capable of moving up and down is arranged to adjust the tension of each cotton sliver; the tension of each cotton sliver entering the rear roller is kept consistent; the detection system is arranged to monitor the quantification of cotton slivers of the drafting mechanism in real time and adjust the rotation speeds of the cotton feeding roller, the pre-pressing mechanism and the rear roller to automatically adjust the draft multiple in real time, so that the cotton slivers at the drawing frame are kept consistent. The problem that pressure is unbalanced due to the fact that multiple cotton slivers are tightened or loosened in the drafting process is solved, high-precision draft multiple adjustment is achieved, and drawing consistency is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of draw frames in the textile industry, and particularly to an autolevelling system and method for a draw frame. Background Art

[0002] Drawing is an important link in the spinning process. Its function is to improve the internal structure of the sliver, thereby improving its long-section evenness, reducing the weight unevenness rate at the same time, straightening and paralleling the fibers in the sliver, reducing the hooks, making the fineness meet the requirements, mixing different types or qualities of raw materials evenly, and achieving the specified mixing ratio. The autolevelling system is based on the deviation of the feeding or output sliver (or cotton layer) quantity (the difference from the rated value), and by changing the speed of the feeding roller or the output roller, the draft ratio is automatically adjusted accordingly, so that the spun sliver (or cotton roll) quantity is kept at a stable value that meets the requirements, and at the same time, it can also improve the weight unevenness rate of different sections of the sliver (or cotton roll).

[0003] For example, Chinese Invention Patent with the publication number CN119352199A and the publication date of January 24, 2025 discloses an autolevelling device and method for flax and wool draw frames, including 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 them, the front roller pair includes a front roller and a front apron, and a front nip is formed between them; the autolevelling control device includes a first servo motor, a second servo motor, a third servo motor and a controller. In the autolevelling device of this invention, the drafting device uses a middle roller and a pressure roller to replace the existing complicated and large-inertia comb box mechanism, with simple structure, light weight, small load, can quickly respond to speed changes, complete high-precision draft ratio adjustment, and will not produce periodic pauses, and the draft ratio adjustment is stable.

[0004] It can be seen from the above patents that the autolevelling device automatically adjusts the draft ratio by controlling the speed during use, but the uneven pressure caused by the tight or loose situation of multiple slivers during the drafting process results in the problem that the tension of each sliver is inconsistent and needs to be adjusted; for this reason, the present invention proposes an autolevelling system and method for a draw frame to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies of the prior art and provide an autolevelling system and method for a draw frame.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: An automatic evenness control system for a drawing frame, comprising a feeding system and a drafting mechanism arranged in sequence along the running direction of the sliver; the feeding system includes a feeding bobbin and a guide roller for conveying the sliver to the drafting mechanism; the drafting mechanism includes a feeding roller, a pre-pressing mechanism, a middle roller group, a pressure roller and a back roller arranged in sequence along the running direction of the sliver and drafting the sliver; the middle roller group includes a plurality of middle rollers arranged at equal intervals, the center of the middle roller is rotationally connected to the front end of an electric telescopic rod through a rotating shaft, the electric telescopic rod is slidably connected in a sleeve, and the sleeve is fixedly installed on a guide bar platform; the middle roller group further includes a controller and a plurality of sensors, the controller is arranged on the guide bar platform, the sensors are arranged in the middle roller and correspond to each other, and the controller is electrically connected to the electric telescopic rod and the sensors respectively; the middle roller group and the pressure roller are matched to form a curve drafting mechanism.

[0007] Preferably, a detection system is arranged in the drafting mechanism, and the detection system includes a first pressure sensor, a second pressure sensor and a third pressure sensor respectively arranged in the feeding roller, the pre-pressing mechanism and the back roller.

[0008] Preferably, a driving system is arranged around the drafting mechanism, and the driving system includes a first servo motor, a second servo motor and a third servo motor respectively used for driving the feeding roller, the pre-pressing mechanism and the back roller.

[0009] Preferably, the drafting mechanism is connected to a drawing frame along the running direction of the sliver, and the drawing frame includes a bunching mechanism and a compressing roller; the bunching mechanism is a flared structure with a large inlet and a small outlet, and the compressing roller is a pair of concave rollers and convex rollers, and the radius of the concave roller is greater than the radius of the convex roller.

[0010] Preferably, a control unit is arranged on the drafting mechanism, and the control unit is electrically connected to the first pressure sensor, the second pressure sensor and the third pressure sensor, and the first servo motor, the second servo motor and the third servo motor respectively.

[0011] An automatic evenness control method for a drawing frame, adopting the automatic evenness control system described in any one of the above, characterized in that: it includes the following steps: S1: The sliver enters the drafting mechanism after passing through the feeding bobbin and the guide roller in sequence, is introduced by the feeding roller onto the pre-pressing mechanism, and then the tension of each sliver is adjusted by the middle roller group and then undergoes curve drafting through the pressure roller, and then enters the drawing frame through the back roller, is bunched by the bunching mechanism, and then the sliver is pressed by the compressing roller; S2: The first pressure sensor, the second pressure sensor, and the third pressure sensor respectively and real-time detect the quantitative value of the sliver at the feed roller, the pre-pressing mechanism, and the back roller, and transmit the detection signals to the control unit. The control unit respectively and dynamically controls the rotational speeds of the feed roller, the pre-pressing mechanism, and the back roller through the first servo motor, the second servo motor, and the third servo motor, so as to keep the slivers at the drawing frame consistent; the sensor real-time detects the tension of the sliver at the middle roller and transmits the detection signal to the controller, and the controller controls the electric telescopic rod to extend or compress, and then drives the middle roller to rise or fall to adjust the tension of the sliver at the middle roller to be consistent.

[0012] The beneficial effects of the present invention are as follows: 1. A middle roller that can move up and down is provided to adjust the tension of each sliver; the tension of each sliver entering the back roller is kept consistent, solving the problem of uneven pressure caused by the situation that some slivers are taut or loose during the drafting process. 2. A detection system is provided to real-time monitor the quantitative value of the sliver of the drafting mechanism and respectively adjust the rotational speeds of the feed roller, the pre-pressing mechanism, and the back roller to real-time and automatically adjust the drafting multiple, so as to keep the slivers at the drawing frame consistent. Description of the Drawings

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0014] The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0015] Figure 1 It is a front structure schematic diagram of the present invention; Figure 2 It is a top structure schematic diagram of the present invention; Figure 3 It is a structure schematic diagram of the middle roller group of the present invention; As shown in the figure: 1. Feeding system; 11. Feeding bale; 12. Guide roller; 2. Drafting mechanism; 21. Feed roller; 22. Preloading mechanism; 23. Middle roller group; 231. Middle roller; 231. Middle roller group; 232. Electric telescopic rod; 233. Sleeve; 234. Guide bar platform; 235. Controller; 236. Sensor; 24. Pressure roller; 25. Rear roller; 3. Detection system; 31. First pressure sensor; 32. Second pressure sensor; 33. Third pressure sensor; 4. Driving system; 41. First servo motor; 42. Second servo motor; 43. Third servo motor; 5. Draw frame; 51. Bundling mechanism; 52. Compressing roller; 6. Control unit. Detailed implementation mode

[0016] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and illustrated herein can generally be arranged and designed in a variety of different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but is merely representative of selected 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 fall within the scope of protection of the present invention.

[0018] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0019] It should be noted that like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. 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. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "linked" 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 directly connected or indirectly connected through an intermediate medium, and it can 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.

[0022] Referring to Figures 1-3 , a self-leveling system for a drawing frame disclosed by the present invention includes a feeding system 1, a drafting mechanism 2, a detection system 3, a driving system 4, a control unit 6, and a drawing frame 5 arranged in sequence along the running direction of the sliver.

[0023] The feeding system 1 for conveying cotton strips to the drafting mechanism 2 includes a feeding can 11 and a guide roller 12. The cotton strips are drawn out of the feeding can 11 by the guide roller 12 and fed into the drafting mechanism 2 in a certain direction. The drafting mechanism 2 includes a feeding roller 21, a pre-pressing mechanism 22, a middle roller group 23, a pressure roller 24 and a rear roller 25; the feeding roller 21 and the rear roller 25 are both a pair of rollers, which are respectively used to pull the cotton strips into and out of the drafting mechanism 2; the pre-pressing mechanism 22 is a combination of rollers and leather rollers, which are used to pre-press the cotton strips, gather the cotton strip fibers, and reduce the loss and confusion of the cotton strip fibers; the middle roller group 23 and the pressure roller 24 form a curved drafting mechanism, which can form an additional friction force boundary, effectively control the floating fibers, and is conducive to improving the uniformity of the strips and further improving the unevenness of the output strips; the middle roller group 23 includes a number of middle rollers 231, sensors 236 and controllers 23 arranged at equal intervals. 5. The center of the middle roller 231 is rotatably connected to the front end of the electric telescopic rod 232 through a rotating shaft. The electric telescopic rod 232 is slidably connected to the sleeve 233. The sleeve 233 is fixedly installed on the guide strip platform 234. The controller 235 is arranged on the guide strip platform 234. A sensor 236 is arranged in each middle roller 231. The controller 235 is electrically connected to the electric telescopic rod 232 and the sensor 236 respectively. The sensor 236 detects the tension of the cotton strip at the middle roller 231 in real time and transmits the detection signal to the controller 235. The controller 235 controls the electric telescopic rod 232 to extend or compress and then drives the middle roller 231 to rise or fall to adjust the tension of the cotton strip at the middle roller 231 to keep it consistent.

[0024] The detection system 3 includes a first pressure sensor 31, a second pressure sensor 32 and a third pressure sensor 33 which are respectively arranged in the feeding roller 21, the pre-pressing mechanism 22 and the back roller 25, and respectively monitors the quantitative amount of the cotton strips at the feeding roller 21, the pre-pressing mechanism 22 and the back roller 25 in real time. The driving system 4 includes a first servo motor 41, a second servo motor 42 and a third servo motor 43 which are used to drive the feeding roller 21, the pre-pressing mechanism 22, the pressure roller 24 and the back roller 25 respectively.

[0025] Along the running direction of the slivers, the drafting mechanism 2 is connected to the drawing frame 5, and the drawing frame 5 includes a bundling mechanism 51 and a pressing roller 52; the bundling mechanism 51 is a trumpet-shaped structure with a large inlet and a small outlet. The bundling mechanism 51 gathers the slivers into a belt in time to prevent the loss and disorder of the edge fibers when the slivers are output at a high speed, increase the cohesion between the fibers, and reduce the winding roller and sliver breakage phenomenon; the pressing roller 52 is a pair of concave roller and convex roller, and the radius of the concave roller is larger than that of the convex roller. The cooperation of the concave roller and the convex roller presses the slivers into tight and smooth slivers, reduces the accidental elongation of the slivers when they are drawn out, and increases the capacity of the sliver tube.

[0026] The control unit 6 is disposed on the drafting mechanism 2 , and is electrically connected to the first pressure sensor 31 , the second pressure sensor 32 , the third pressure sensor 33 , and the first servo motor 41 , the second servo motor 42 , and the third servo motor 43 , respectively.

[0027] The principles and workflow of this application are as follows: A plurality of cotton strips are drawn out from the feeding can 11 by the strip guide roller 12 and fed into the drafting mechanism 2 in a certain direction. The feeding roller 21 pulls the cotton strips into the drafting mechanism 2, and at the same time, the first pressure sensor 31 monitors the quantitative amount of the cotton strips at the feeding roller 21 in real time, and transmits the detection signal to the control unit 6. The control unit 6 compares the detection signal with the set standard value, and according to the comparison result, controls the rotation speed of the feeding roller 21 through the first servo motor 41 to automatically adjust the drafting multiple in real time (the drafting multiple is adjusted from the moment the cotton strips enter the feeding roller 21); the cotton strips then reach the pre-pressing mechanism 22, where the second pressure sensor 32 monitors the quantitative amount of the cotton strips at the pre-pressing mechanism 22 in real time, and transmits the detection signal to the control unit 6. The control unit 6 compares the detection signal with the set standard value, and according to the comparison result, controls the rotation speed of the pre-pressing mechanism 22 through the second servo motor 42 to automatically adjust the drafting multiple in real time; the cotton strips then reach the middle roller group 23, where each middle roller group 23 is used to press the cotton strips. The sensor 236 on the roller 231 detects the tension of the cotton strips at the middle roller 231 in real time and transmits the detection signal to the controller 235. The controller 235 controls the electric telescopic rod 232 to extend or compress and then drive the middle roller 231 to rise or fall to adjust the tension of the cotton strips at the middle roller 231 to remain consistent; the cotton strips then reach the pressure roller 24 for curve drawing, and then reach the rear roller 25. The third pressure sensor 33 monitors the quantity of the cotton strips at the rear roller 25 in real time and transmits the detection signal to the control unit 6. The control unit 6 compares the detection signal with the set standard value. According to the comparison result, the third servo motor 43 controls the rotation speed of the rear roller 25 to automatically adjust the drawing multiple in real time, so that the cotton strips at the drawing machine 5 remain consistent; the cotton strips are then gathered by the bundling mechanism 51 and pressed into tight and smooth strips by the pressing roller 52.

[0028] Of course, the embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-leveling system for a drawing frame, comprising a feeding system (1) and a drafting mechanism (2) arranged in sequence along the running direction of the sliver; the feeding system (1) includes a feeding bobbin (11) and a guide roller (12) for conveying the sliver to the drafting mechanism (2); characterized in that: The drafting mechanism (2) includes a feed roller (21), a pre-pressing mechanism (22), a middle roller group (23), a pressure roller (24), and a back roller (25) that are sequentially arranged along the running direction of the sliver and draft the sliver; the middle roller group (23) includes a number of middle rollers (231) arranged at equal intervals, the center of the middle roller (231) is rotationally connected to the front end of an electric telescopic rod (232) through a rotating shaft, the electric telescopic rod (232) is slidably connected within a sleeve (233), and the sleeve (233) is fixedly installed on a guide bar platform (234); the middle roller group (23) further includes a controller (235) and a number of sensors (236), the controller (235) is arranged on the guide bar platform (234), the sensors (236) are arranged within the middle roller (231) and correspond to each other, and the controller (235) is electrically connected to the electric telescopic rod (232) and the sensors (236) respectively; the middle roller group (23) and the pressure roller (24) cooperate to form a curved drafting mechanism.

2. The self-leveling system for a drawing frame according to claim 1, characterized in that: A detection system (3) is arranged within the drafting mechanism (2), and the detection system (3) includes a first pressure sensor (31), a second pressure sensor (32), and a third pressure sensor (33) that are respectively arranged within the feed roller (21), the pre-pressing mechanism (22), and the back roller (25).

3. The automatic evenness control system for a drawing frame according to claim 1, wherein: A driving system (4) is arranged around the drafting mechanism (2), and the driving system (4) includes a first servo motor (41), a second servo motor (42), and a third servo motor (43) that are respectively used to drive the feed roller (21), the pre-pressing mechanism (22), and the back roller (25).

4. A self-leveling system for a drawing frame according to claim 1, characterized in that: The drafting mechanism (2) is connected to a drawing frame (5) along the running direction of the sliver, and the drawing frame (5) includes a bunching mechanism (51) and a compressing roller (52); the bunching mechanism (51) is a flared structure with a large inlet and a small outlet, and the compressing roller (52) is a pair of concave and convex rollers, and the radius of the concave roller is greater than the radius of the convex roller.

5. The self-leveling system for a drawing frame according to claim 1, characterized in that: A control unit (6) is arranged on the drafting mechanism (2), and the control unit (6) is electrically connected to the first pressure sensor (31), the second pressure sensor (32), the third pressure sensor (33), the first servo motor (41), the second servo motor (42), and the third servo motor (43) respectively.

6. A method for a self-leveling system of a drawing frame, using the self-leveling system according to any one of claims 1-5, characterized in that: It includes the following steps: S1: The sliver enters the drafting mechanism (2) successively through a feeding sliver can (11) and a guide bar roller (12), is introduced by the feed roller (21) onto the pre-pressing mechanism (22), then the tension of each sliver is adjusted by the middle roller group (23), and then undergoes curved drafting through the pressure roller (24), and then enters the drawing frame (5) through the back roller (25), is bunched by the bunching mechanism (51), and then is strip-compressed by the compressing roller (52). S2: The first pressure sensor (31), the second pressure sensor (32) and the third pressure sensor (33) respectively and real-time detect the quantitative value of the sliver at the feed roller (21), the pre-pressing mechanism (22) and the back roller (25), and transmit the detection signals to the control unit (6). The control unit (6) respectively and dynamically controls the rotational speeds of the feed roller (21), the pre-pressing mechanism (22) and the back roller (25) through the first servo motor (41), the second servo motor (42) and the third servo motor (43), so as to keep the sliver at the drawing frame (5) consistent; the sensor (236) real-time detects the tension of the sliver at the middle roller (231) and transmits the detection signal to the controller (235), and the controller (235) controls the electric telescopic rod (232) to extend or compress, and then drives the middle roller (231) to rise or fall to adjust the tension of the sliver at the middle roller (231) to be consistent.

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