Cotton spinning drafting device and cotton spinning machine

Abstract

The invention relates to the technical field of cotton spinning machines, and discloses a cotton spinning drafting device and a cotton spinning machine.The cotton spinning drafting device comprises a base installed on the inner bottom face of a cotton spinning rack or the ground, the top of the base is connected with a bracket through a supporting rod, the top face of the bracket is rotationally connected with a drafting structure, and the drafting structure is composed of at least one drafting column; the drafting column is connected with the output end of a servo motor and used for driving the drafting column to rotate, and at least two augers used for containing cotton fiber threads are installed on the surface of the drafting column. When cotton fiber threads are fed, a servo motor is directly started to drive one drafting column to rotate, when one drafting column rotates, an auger on the surface of the drafting column starts to be driven to rotate synchronously, the auger moves backwards, the other auger does not move, and the two drafting columns are in a relative far-away state; therefore, the cotton fiber threads are effectively drafted, and the beneficial effects that the traditional two groups of jaws are improved, rollers are not used for drafting, and the occupied area is smaller are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cotton spinning machines, in particular to a cotton spinning drafting device and a cotton spinning machine. Background Art

[0002] The processing of bulk fiber raw material into fiber layers or slivers, and then into roving and spun yarn, requires a gradual thinning process. Therefore, drafting is involved in nearly every major spinning machine or process. Drafting essentially involves the relative displacement of fibers along the axis of the aggregate, distributing them over longer segments. The result is a reduction in the linear density of the aggregate while simultaneously straightening and parallelizing the fibers. Drafting achieved with the aid of airflow is called air drafting, while drafting achieved with rollers of varying surface speeds is called roller drafting. Roller drafting is widely used in various types of conventional spinning.

[0003] For example, the prior art CN 214882017 U discloses a cotton spinning frame drafting device, comprising an adjusting assembly disposed at the head of the inner cavity of the drafting device body, for moving the position of the drafting wheel to adjust the drafting strength. The arrangement of the adjusting assembly and the lubrication assembly can adjust the drafting strength, improve the stability of the drafting wheel during use, and reduce the time cost of user maintenance. In addition, the drafting wheel is disposed on the outside of the drafting device body, and the conveying roller is disposed inside the drafting device body, thereby reducing the problem of lint and short fiber yarns floating in the air and polluting the environment, and facilitating long-term use by users. Another example is the prior art CN 216074135 U discloses a drafting roller anti-sticking device. In this technical solution, when fine impurities or cotton fibers in the cotton sliver passing through the drafting part adhere to the drafting roller, the cleaning hose on the roller anti-sticking device can promptly remove the adhered fine impurities or cotton fibers, and the removed impurity fibers can be promptly sucked away through the suction duct below, thereby effectively preventing the product quality from being affected by the sticking of the drafting roller.

[0004] The above existing roller stretching technologies are all based on more than two jaws, that is, two sets of rollers. Combining the above existing technologies with traditional technologies, it is found that the roller group has the defect of occupying a large space. Due to the mechanical stretching multiple formula E=V1 / V2, the two roller groups must be separated by a certain distance to serve as a buffer zone for the fibers to be stretched. Secondly, when using the roller group for stretching, once the jaws are adjusted too tight, the fiber line pressure is greater due to the small contact area, which makes it more likely to cause fiber breakage. Summary of the Invention

[0005] Technical issues solved: In response to the shortcomings of the existing technology, the present invention provides a cotton spinning drafting device and a cotton spinning machine, which have the advantages of improving the traditional two sets of jaws, no longer using rollers for drafting, occupying a smaller area, increasing the contact area between the cotton fiber line and the drafting device, and reducing the risk of drafting breakage, thereby solving the problems of the above-mentioned technology. Technical Solution

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a cotton spinning drafting device, comprising a base installed on the bottom surface or the ground inside a cotton spinning frame, the top of the base being connected to a bracket via a support rod, the top surface of the bracket being rotatably connected to a drafting structure, the drafting structure being composed of at least one drafting column, the drafting column being connected to the output end of a servo motor for driving its own rotation, at least two augers for accommodating cotton fiber lines being installed on the surface of the drafting column, the two augers being respectively located at the front and rear ends of the drafting column and not in contact with each other, the two augers draft the internal cotton fiber lines under the action of a differential structure or a structure for driving the augers to slide on the surface of the drafting column.

[0007] Preferably, the number of the drafting column is one, and the front and rear ends of the surface of one drafting column are respectively connected to the auger, and the auger and the drafting column slide back and forth by means of a slide groove and a slider.

[0008] Preferably, the driving auger sliding structure on the drafting column surface includes at least one blocking rod, the front end of the blocking rod is equipped with a pressing part, the pressing part ball fits the surface of the drafting column, and the pressing part is located in the central area of the drafting column close to the two augers, the side wall of the blocking rod connected to the pressing part is close to the concave texture of the auger outlet, the tail end of the blocking rod is fixedly connected to the support rod, and the support rod is vertically downwardly connected to the ground or the bottom surface of the cotton spinning frame. The blocking rod is used to generate friction with the auger when the auger rotates, forcing the auger to move toward one end of the bracket according to its own texture, so that the auger slides and stretches the cotton fiber line while rotating. The driving auger sliding structure on the drafting column surface also includes a roller, the roller is installed on one end of the auger near the bracket and is connected to its surface in a rolling manner, the roller axis is rotatably connected to the front end of the spring rod, and the tail end of the spring rod is detachably fixed to the bracket surface with a bolt, and the spring rod is used to push the auger forward when it moves backward.

[0009] Preferably, the number of the drafting columns is two. A screw conveyor is fixedly installed on the surface of each of the two drafting columns. The axes of the two drafting columns face each other and their diameters are equal. A through hole penetrating through itself is formed in the axial center area at the tail end of any one of the two drafting columns. A connecting rod is fixedly connected to the inner side of the through hole. A servo motor is connected to the connecting rod near the tail end of the drafting column through a coupling. The front section of the connecting rod passes through the through hole and is fixedly connected to a first gear tooth. The top of the first gear tooth is meshed with a second gear tooth whose diameter is 30%-50% smaller than its own. The second gear tooth is rotatably connected to the front wall of the current drafting column. A transmission rod is fixedly connected to the axial center of the second gear tooth. The tail end of the transmission rod is fixedly connected to the axial center of a third gear tooth. The third gear tooth is located on the front wall of the other drafting column. The diameter of the third gear tooth is 30%-50% larger than that of the second gear tooth. The bottom of the third gear tooth is meshed with a fourth gear tooth fixedly installed at the center of the front wall of the other drafting column. The first gear tooth, the second gear tooth, the third gear tooth and the fourth gear tooth form a differential structure for staggering the rotation speeds of the two drafting columns so as to draft the cotton fiber thread during their self-rotation.

[0010] Preferably, a support is rotatably connected to the middle section of the transmission rod. The bottom of the support extends downward until it reaches the same height as the base to form a support for the transmission rod.

[0011] Preferably, a rotating shaft is further arranged at the center of the front and rear ends of the support. The inner shaft area of the rotating shaft is fixedly connected to the axial center areas of the first gear tooth and the fourth gear tooth through a rod body for supporting the front ends of the two drafting columns.

[0012] Preferably, the differential structure further includes a covering shell. The covering shell is a hollow cylindrical structure and is located between the two drafting columns. The distance between the three is infinitely close but they do not directly contact. The diameter of the covering shell is equal to the diameter of the drafting column and their surfaces are flat.

[0013] Preferably, an opening is formed at the bottom of the covering shell. The bottom of the support is sleeved inside the opening and the two are connected by bolts to form relative fixation.

[0014] Preferably, an electric telescopic rod is further installed below the bracket and above the base. The electric telescopic rod is used to lift and lower the drafting column so that its relative height rises or falls to meet the requirements of different heights.

[0015] A cotton spinning machine spins cotton using the cotton thread drafted by the cotton spinning drafting device as claimed in claim 9. The cotton spinning machine includes a frame. The front end inside the frame accommodates the drafting device. The rear side inside the frame is connected to a cotton spinning structure.

[0016] Furthermore, the cotton spinning machine is an existing technology, such as the technical solution with publication number CN108796684A, which directly introduces the cotton yarn stretched by the stretching device of this application into the cotton spinning machine to complete the loading, and then the cotton spinning machine works. Since its technical solution is too simple, it can be clearly described without the need for drawings, and this application no longer uses drawings to illustrate it.

[0017] Compared with the prior art, the present invention provides a cotton spinning drafting device and a cotton spinning machine, which have the following beneficial effects: 1. The present invention directly turns on the servo motor to drive a drafting column to start rotating when the cotton fiber line is loaded. When one drafting column rotates, the auger on its surface starts to be driven to rotate synchronously. Once the auger starts to rotate, its friction will carry the cotton fiber line attached to the inside of the auger along the grain to the tail end of the drafting column. At this time, the pressing part in contact with the grain inside the auger will also form a relative motion with its inner wall as the auger moves to offset the hard friction. Since the blocking rod connected to the pressing part is in a fixed position, the auger will be limited by the pressing part after it actually contacts the pressing part, and since the rotation of the auger cannot be stopped, it will move backward under the restriction of the blocking rod. At this time, since the auger moves backward and the other auger does not move, a relative distance state is generated between the two, thereby effectively drafting the cotton fiber line and achieving the beneficial effect of improving the traditional two sets of jaws and not using rollers for drafting, which occupies a smaller area.

[0018] 2. The present invention directly turns on the servo motor to drive a drafting column to start rotating when the cotton fiber line is being loaded. When a drafting column rotates, the auger on its surface starts to be driven to rotate synchronously. Once the auger starts to rotate, its friction will carry the cotton fiber line attached to the inside of the auger along the grain toward the tail end of the drafting column. Due to the presence of multiple spiral forward auger grains, its actual contact area is greater than that of a traditional drafting device, thereby achieving the beneficial effect of increasing the contact area between the cotton fiber line and the drafting device and reducing the risk of drafting breakage.

[0019] 3. The present invention winds the cotton fiber line around the auger on the surface of one or two drafting columns for one circle, and then the auger can rotate to drive the cotton fiber line to move to the other drafting column, thereby achieving the beneficial effect that the cotton fiber line can be put on the line more easily in the initial stage without adjusting the drafting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of embodiment 1 of the present invention; Figure 2 This is a side view of the auger structure of Example 1 of the present invention; Figure 3 It is an enlarged schematic diagram of the support rod structure of the present invention; Figure 4 This is a schematic diagram of the overall structure of embodiment 2 of the present invention; Figure 5 Internal schematic diagram of the overall structure of the second embodiment of the present invention; Figure 6 Schematic diagram of the support structure of the present invention; Figure 7 Schematic diagram of the cooperation state between the pressing group and the covering shell of the present invention; Figure 8 Schematic diagram of the distribution state of the pressing groups on the outer periphery of the covering shell of the present invention; Figure 9 Partial cross-sectional view of the pressing assembly of the present invention.

[0021] Wherein: 1. Bracket; 2. Drafting column; 201. Auger; 2011. Blocking rod; 2012. Pressing part; 2013. Support rod; 2014. Buffer block; 2015. Blind hole; 2016. Spring; 3. Roller; 301. Spring rod; 4. Link; 401. First tooth; 402. Second tooth; 4021. Transmission rod; 403. Third tooth; 404. Fourth tooth; 5. Support; 6. Covering shell; 7. Electric telescopic rod; 8. Pressing group; 810. Pressing subgroup; 811. Pressing assembly. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. 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. Embodiment

[0023] Please refer to Figures 1-6 , a cotton spinning drafting device, including a base installed on the inner bottom surface or the ground of the cotton spinning machine frame. The top of the base is connected to the bracket 1 through a support rod. The top surface of the bracket 1 is rotatably connected to a drafting structure. The drafting structure is composed of at least one drafting column 2. The drafting column 2 is connected to the output end of a servo motor to drive its own rotation. At least two augers 201 for accommodating cotton fiber lines are installed on the surface of the drafting column 2. The two augers 201 are respectively located at the front and rear ends of the drafting column 2 and do not contact each other. The two augers perform drafting on the internal cotton fiber lines under the action of a differential structure or a structure that drives the auger 201 to slide on the surface of the drafting column 2.

[0024] There is one drafting column 2, and the front and rear ends of the surface of one drafting column 2 are respectively connected to the auger 201, and the auger 201 and the drafting column 2 slide back and forth by means of a slide groove and a slider. A pressing part 2012 is installed at the front end of the blocking rod 2011. The pressing part 2012 is specifically a universal ball. By pressing the covering shell 6 through the universal ball, hard friction can be reduced to avoid damage to the cotton fiber line. The sphere of the pressing part 2012 fits on the surface of the drafting column 2, and the pressing part 2012 is located in the central area of the drafting column 2 where the two augers 201 are close to each other. The side wall of the blocking rod 211 connected to the pressing part 2012 is close to the concave texture of the auger 201 outlet, and the tail end of the blocking rod 2011 is fixedly connected to the support rod. 2013, the support rod 2013 is connected vertically downward to the ground or the bottom surface of the cotton spinning machine frame, and the blocking rod 201 is used to rub against the auger 201 when it rotates, forcing the auger 201 to move toward one end of the bracket 1 according to its own texture, so that the auger 201 slides and stretches the cotton fiber line while rotating, and the auger 201 is driven to slide on the surface of the drafting column. The structure also includes a roller 3, which is installed on the end of the auger 201 close to the bracket 1 and is connected to its surface in a rolling manner. The axial rotation of the roller 3 is connected to the front end of the spring rod 301, and the tail end of the spring rod 301 is detachably fixed to the surface of the bracket 1 with a bolt. The spring rod 301 is used to push the auger 201 forward when it moves backward.

[0025] Furthermore, the connection method of the slider and the slot belongs to a transmission technology that is widely used in the existing technology. This application does not involve improvements to this technology and directly uses the existing slot slider, such as the existing technology with publication number CN218266811U. Therefore, this application does not separately describe it in the drawings, nor does it separately describe its structure and principle in the specification.

[0026] Furthermore, when feeding the cotton fiber line, the servo motor is directly turned on to drive a drafting column 2 to start rotating. When a drafting column 2 rotates, the auger 201 on its surface begins to be driven to rotate synchronously. Once the auger 201 starts to rotate, its friction will carry the cotton fiber line attached to the inside of the auger 201 along the grain to the tail end of the drafting column 2. At this time, the pressing part 2012 in contact with the internal grain of the auger 201 will also move with the auger 201 to form a relative motion with its inner wall to offset the hard friction. Since the blocking rod 2011 connected to the pressing part 2012 is in a fixed position, the auger 201 will be limited by the pressing part 2012 after it actually contacts it. Since the rotation of the auger 201 cannot be stopped, it will move backward under the restriction of the blocking rod 2011. For details, please refer to the attached manual. Figure 1 At this time, since the auger 201 moves backward and the other auger 201 does not move, a relative distance between the two is generated, thereby effectively stretching the cotton fiber line.

[0027] Furthermore, the position where the blocking rod 2011 is installed must be the auger at the end of the cotton fiber line where it exits from the drafting column 2. In this way, the pressing part will not press the cotton fiber line, but will only roll over its surface after contacting the cotton fiber line without causing it to break. Embodiment

[0028] Please refer to Figures 1-6 , the number of drafting columns 2 is two. An auger 201 is fixedly installed on the surface of each of the two drafting columns. The axes of the two drafting columns 2 are opposite to each other and their diameters are equal. A through hole penetrating itself is opened in the axial center area at the end of any one of the two drafting columns 2. A connecting rod 4 is fixedly connected to the inside of the through hole. A servo motor is connected to the connecting rod 4 near the end of the drafting column 2 through a coupling. The front section of the connecting rod 4 passes through the through hole and is fixedly connected to a first gear tooth 401. The top of the first gear tooth 401 meshes with a second gear tooth 402 whose diameter is 30%-50% smaller than its own. The second gear tooth 402 is rotatably connected to the front wall of the current drafting column 2. A transmission rod 4021 is fixedly connected to the axis of the second gear tooth 402. The tail end of the transmission rod 4021 is fixedly connected to the axis of a third gear tooth 403. The third gear tooth 403 is located on the front wall of the other drafting column 2. The diameter of the third gear tooth 403 is 30%-50% larger than that of the second gear tooth 402. The bottom of the third gear tooth 403 meshes with a fourth gear tooth 404 fixedly installed at the center of the front wall of the other drafting column 2. The first gear tooth 401, the second gear tooth 402, the third gear tooth 403, and the fourth gear tooth 404 form a differential structure for staggering the rotation speeds of the two drafting columns 2 so that the cotton fiber line is drafted when they rotate.

[0029] Furthermore, since there are two drafting columns 2, it is necessary to provide power to the two drafting columns 2. After the servo motor is started, the connecting rod 4 is directly driven to rotate. Since the tail end of the connecting rod 4 is fixedly connected to the No. 1 gear 401, it will synchronously drive the No. 1 gear to rotate. Further, when the No. 1 gear 401 starts to rotate, it will drive the No. 2 gear 402 to rotate. Since the No. 2 gear 402 itself is not connected to the surface of the drafting column 2, there will be no problem of being unable to rotate. Further, when the No. 2 gear 402 rotates, it will drive the No. 3 gear 403 to rotate through the transmission rod 4021 fixed to itself. Since the diameter of the No. 2 gear 402 is smaller than that of the No. 1 gear 401, when the drafting column 2 rotates, the speed of the No. 2 gear 402 will be greater than the speed of the No. 1 gear 401. Further, the No. 3 gear 403 The diameter is larger than the No. 4 tooth 404, and the rotation speed will be increased again at this time. Because the No. 4 tooth 404 is fixedly installed on the surface of another drafting column 2, the rotation speeds of the two drafting columns 2 will form a differential speed at this time. After the cotton fiber line is wrapped around the auger 201 on the surface of the slow-rotating drafting column 2, the auger 201 can rotate and drive the cotton fiber line to move to the other drafting column 2. When it reaches the covering shell 6, manual intervention is performed to wrap the thread end part around the surface of another auger 201 again. At this time, the other drafting column 2 with a faster rotation speed will drive the auger 201 to rotate faster than the other auger 201, so that it meets the mechanical drafting multiple formula E=V1 / V2, completing roller drafting, and different from the two roller wheel groups at a certain distance in the prior art, this technical solution only requires at least one drafting column 2 to complete the drafting.

[0030] Furthermore, the support 5 is connected to the second gear 402 and the third gear 403 at the same time, but it will not affect the transmission of the two. At the same time, the support 5 is also indirectly connected to the two drafting columns 2 to support them, forming two parallel supports with the electric telescopic rod 7. Furthermore, the telescopic structure at the bottom of the support is a bolt-fixed telescopic rod or the same electric rod, which is used to cooperate with the electric telescopic rod 7 to adjust the overall height of the drafting device.

[0031] When in use, after the cotton fiber line is wrapped around the auger 201 on the surface of one or two drafting columns, the auger 201 can rotate and drive the cotton fiber line to move toward the other drafting column 2. When there is only one drafting column 2, the auger 201 on its surface begins to be driven to rotate synchronously when one drafting column 2 rotates. Once the auger 201 starts to rotate, its friction will carry the cotton fiber line attached to the inside of the auger 201 along the grain toward the tail end of the drafting column 2. At this time, the pressing part 2012 in contact with the grain inside the auger 201 will also move with the auger 201 to form a relative motion with its inner wall to offset the hard friction. Since the blocking rod 2011 connected to the pressing part 2012 is in a fixed position, the auger 201 will be limited by the pressing part 2012 after it actually contacts it. Since the rotation of the auger 201 cannot be stopped, it will move backward under the restriction of the blocking rod 2011. For details, please refer to the attached manual. Figure 1 At this time, since the auger 201 moves backward and the other auger 201 does not move, a relative distance between the two is generated, thereby effectively stretching the cotton fiber line; When there are two drafting columns, the servo motor is started to directly drive the connecting rod 4 to rotate. Since the tail end of the connecting rod 4 is fixedly connected to the No. 1 gear 401, it will synchronously drive the No. 1 gear to rotate. Further, when the No. 1 gear 401 starts to rotate, it will drive the No. 2 gear 402 to rotate. Since the No. 2 gear 402 itself is not connected to the surface of the drafting column 2, there will be no problem of being unable to rotate. Further, when the No. 2 gear 402 rotates, it will drive the No. 3 gear 403 to rotate by itself through the transmission rod 4021 to which it is fixed. Since the diameter of the No. 2 gear 402 is smaller than that of the No. 1 gear 401, when the drafting column 2 rotates, the speed of the No. 2 gear 402 will be greater than the speed of the No. 1 gear 401. Furthermore, the diameter of the No. 3 gear 403 is larger than that of the No. 4 gear 404. At this time, the rotation speed will be increased again, and because the fourth tooth 404 is fixedly mounted on the surface of the other drafting column 2, the rotation speeds of the two drafting columns 2 will form a speed difference at this time, and after the cotton fiber line is wrapped around the auger 201 on the surface of the slow-rotating drafting column 2, the auger 201 can rotate and drive the cotton fiber line to move to the other drafting column 2. When it reaches the covering shell 6, manual intervention is performed to wrap the thread end part around the surface of the other auger 201 again. At this time, the other drafting column 2 with a faster rotation speed will drive the auger 201 to rotate faster than the other auger 201, so that it satisfies the mechanical drafting multiple formula E=V1 / V2, completing the roller drafting, and different from the two roller wheel groups at a certain distance in the prior art, this technical solution only requires at least one drafting column 2 to complete the drafting.

[0032] The blocking rod 2011, the pressing portion 2012, and the support rod 2013 together form a pressing assembly 811. More preferably, Figure 7 、 Figure 8As shown, a plurality of pressing components 811 are provided. The plurality of pressing components 811 are arranged along the axial direction of the covering shell 6 to form a plurality of pressing groups 8. Each pressing group 8 includes at least two pressing sub-groups 810. The distance between the pressing part 2012 close to the output end of the auger 201 and the covering shell 6 in each group of pressing components 811 is smaller than the distance between the pressing part 2012 far from the output end of the auger 201 and the covering shell 6 in this group of pressing components 811; the distance between the pressing part 2012 and the covering shell 6 in multiple groups of pressing components 811 gradually increases from the output end to the input end of the auger 201, so that the thickness of the cotton fiber line on the covering shell 6 can be gradually thinned in the direction from the input end to the output end of the auger 201, avoiding the accumulation of the cotton fiber line at the last pressing component 811. If only one pressing component 811 is provided, it may cause the cotton fiber line to wind and accumulate at the pressing component 811, and more seriously, it will cause blockage inside the auger 201. By setting the pressing group 8, the overall working load of the equipment is reduced, and the drafting efficiency and drafting effect of the cotton fiber line are improved.

[0033] Specifically, the distances between the adjacent pressing sub-groups 810 of the two pressing groups 8 and the covering shell 6 can be equal, or the distance between the pressing sub-group 810 close to the output end of the covering shell 6 and the covering shell 6 in the two pressing groups 8 is smaller than the distance between the pressing sub-group 810 far from the output end of the covering shell 6 and the covering shell 6. This can better ensure that the linear density of the cotton fiber line can be gradually reduced, enabling the pressing group 8 to press the cotton fiber line step by step in a stepped manner, making the treatment of the cotton fiber line more gentle and greatly improving the stability of the entire device.

[0034] Furthermore, each pressing sub-group 810 includes at least one pressing component 811. Preferably, each pressing sub-group 810 includes a plurality of pressing components 811. In this embodiment, three pressing components 811 are selected. The pressing components 811 in the pressing sub-group 810 are distributed circumferentially around the covering shell 6, which can press the cotton fiber line outside the covering shell 6 from multiple angles, ensuring that the cotton fiber line outside the covering shell can be evenly thinned and reducing the pressure borne by a single pressing component 811.

[0035] Furthermore, as Figure 9As shown, a buffer block 2014 is fixedly arranged at the top of the support rod 2013. A blind hole 2015 is formed in the buffer block 2014. The blocking rod 2011 is inserted into the blind hole 2015. The blocking rod 2011 can slide in the blind hole 2015. A limit clamping block is arranged in the blind hole 2015 to prevent the blocking rod 2011 from detaching. A spring 2016 is arranged in the blind hole 2015. The blocking rod 2011 presses on the spring 2016. When the pressing part 2012 contacts the cotton fiber thread to generate pressure, the blocking rod 2011 compresses the spring 2016, playing a buffering role and avoiding hard pressing damage to the cotton fiber thread. Preferably, the blocking rod 2011 and the buffer block 2014 in the pressing group 8 closest to the output end of the covering shell 6 are rigidly connected. In order to ensure that the pressing assembly 811 and the covering shell 6 output the fibers evenly, the remaining pressing groups 8 are all provided with springs 2016 for buffering, so that the cotton fiber thread can be buffered when being squeezed on the covering shell 6, greatly reducing the damage probability of the cotton fiber thread. A better choice is that the elasticity of the spring 2016 in the pressing group 8 gradually decreases from the output end to the input end of the covering shell 6, which can better squeeze the cotton fiber thread outside the covering shell 6, gradually adjust the pressing force on the cotton fiber thread, make the pressing process more linear, and make the output effect of the cotton fiber thread better.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cotton spinning draft device, comprising a base installed on the inner bottom surface or the ground of a cotton spinning machine frame, and a bracket (1) is connected to the top of the base through a support rod, and is characterized in that: The top surface of the bracket (1) is rotatably connected to a drafting structure, and the drafting structure is composed of at least one drafting column (2). The drafting column (2) is connected to the output end of a servo motor for driving its own rotation. At least two augers (201) for accommodating cotton fiber lines are installed on the surface of the drafting column (2). The two augers (201) are respectively located at the front and rear ends of the drafting column (2) and do not contact each other. The two augers draft the internal cotton fiber lines under the action of a differential structure or a sliding structure of the driving augers (201) on the surface of the drafting column (2).

2. The cotton spinning draft device according to claim 1, characterized in that: The number of the drafting column (2) is one, and the front and rear ends of the surface of one drafting column (2) are respectively sleeved with the auger (201), and the auger (201) and the drafting column (2) slide forward and backward by means of a slide groove and a slider.

3. The cotton spinning draft device according to claim 2, characterized in that: The driving screw (201) sliding structure on the drafting column surface includes at least one blocking rod (2011), a pressing portion (212) is installed at the front end of the blocking rod (211), the sphere of the pressing portion (212) is fitted on the surface of the drafting column (2), and the pressing portion (212) is located in the central area of the drafting column (2) where the two screws (201) are close to each other. The side wall of the blocking rod (211) connected to the pressing portion (212) is close to the concave groove of the screw (201) outlet. The tail end of the blocking rod (2011) is fixedly connected to the support rod (213), and the support rod (213) is vertically connected to the ground or the bottom surface of the cotton spinning frame. (211) is used to generate friction with the auger (201) when the auger (201) rotates, forcing the auger (201) to move toward one end of the bracket (1) according to its own texture, so that the auger (201) slides and stretches the cotton fiber line while rotating. The structure for driving the auger (201) to slide on the surface of the stretching column also includes a roller (3). The roller (3) is installed at one end of the auger (201) close to the bracket (1) and is connected to the surface of the auger (201) in a rolling manner. The roller (3) is axially rotated to connect the front end of the spring rod (301). The tail end of the spring rod (301) is detachably fixed to the surface of the bracket (1) using bolts. The spring rod (301) is used to push the auger (201) forward when it moves backward.

4. A cotton spinning drafting device according to claim 1, characterized in that: The number of the drafting columns (2) is two. A screw conveyor (201) is fixedly installed on the surface of each of the two drafting columns. The axes of the two drafting columns (2) face each other and their diameters are equal. A through hole penetrating through itself is opened in the axial center area at the tail end of any one of the two drafting columns (2). A connecting rod (4) is fixedly connected to the inner side of the through hole. A servo motor is connected to the connecting rod (4) near the tail end of the drafting column (2) through a coupling. The front section of the connecting rod (4) passes through the through hole and is fixedly connected to a first gear (401). The top of the first gear (401) meshes with a second gear (402) whose diameter is 30%-50% smaller than its own. The second gear (402) is rotatably connected to the front wall of the current drafting column (2). A transmission rod (4021) is fixedly connected to the axial center of the second gear (402). The tail end of the transmission rod (4021) is fixedly connected to the axial center of a third gear (403). The third gear (403) is located on the front wall of the other drafting column (2). The diameter of the third gear (403) is 30%-50% larger than that of the second gear (402). The bottom of the third gear (403) meshes with a fourth gear (404) fixedly installed at the center of the front wall of the other drafting column (2). The first gear (401), the second gear (402), the third gear (403) and the fourth gear (404) form a differential structure for staggering the rotation speeds of the two drafting columns (2) so as to draft the cotton fiber yarn when they rotate.

5. A cotton spinning draft device according to claim 4, characterized in that: A support (5) is rotatably connected to the middle section of the transmission rod (4021). The bottom of the support extends downward until it reaches the same height as the base to form a support for the transmission rod.

6. A cotton spinning drafting device according to claim 5, characterized in that: Shafts are further arranged at the centers of the front and rear ends of the support (5). The inner shaft area of the shafts is fixedly connected to the axial center areas of the first gear (401) and the fourth gear (404) through rods for supporting the front ends of the two drafting columns (2).

7. A cotton spinning drafting device according to claim 1, characterized in that: The differential structure further includes a covering shell (6). The covering shell (6) is a hollow cylindrical structure and is located between the two drafting columns (2). The distance between the three is infinitely close but they do not directly contact. The diameter of the covering shell (6) is equal to the diameter of the drafting column (2), and their surfaces are flat.

8. A cotton spinning drafting device according to claim 7, characterized in that: An opening is opened at the bottom of the covering shell (6). The bottom of the support (5) is sleeved inside the opening, and the two are connected by bolts to form relative fixation.

9. A cotton spinning draft device according to claim 5, characterized in that: An electric telescopic rod (7) is further installed below the bracket (1) and above the base. The electric telescopic rod (7) is used to lift and lower the drafting column (2) so that its relative height rises or falls to meet the requirements of different heights. The bottom of the support is also installed with a telescopic structure corresponding to the electric telescopic rod (7).

10. A cotton spinning machine, characterized in that, The cotton spinning machine spins cotton yarn drafted by the cotton spinning drafting device according to any one of claims 1-9. The cotton spinning machine includes a frame. The front end inside the frame accommodates the drafting device, and the rear side inside the frame is connected to the cotton spinning structure.

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