A drafting device for a tension-adjustable roving frame

Abstract

This invention relates to the field of spinning equipment technology, and in particular to a tension-adjustable drafting device for a roving frame, comprising a frame, guide posts, lower roller mechanisms, and upper rollers. The guide posts are mounted on the frame. Multiple lower roller mechanisms are located in front of the guide posts, spaced apart along the front-rear direction and rotatably mounted on the frame. Multiple upper rollers are also spaced apart along the front-rear direction and rotatably mounted on the frame, correspondingly positioned above each lower roller mechanism and forming a preset gap with each lower roller mechanism. This invention, with its lower roller mechanism and upper rollers, allows for adjustment of the fiber sliver movement per revolution of the tapered insert roller without disassembling the rollers, thereby achieving the purpose of adjusting the tension of the roving frame. Therefore, operation is simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of spinning equipment technology, and in particular to a drafting device for a roving frame with adjustable tension. Background Technology

[0002] A roving frame is a spinning device that produces roving from fiber slivers. Its main functions are drafting, twisting, and winding the roving into a specific roll shape to meet the processing requirements of a ring spinning frame.

[0003] A roving frame consists of three main parts: a drafting device, a twisting device, and a winding device. The drafting device elongates and thins the fiber sliver by using the speed difference between rollers and other components, causing relative displacement between the fibers to achieve a specified linear density. For example, the back roller feeds the fiber sliver at a slower speed, while the front roller outputs it at a faster speed, thereby elongating and thinning the fiber sliver.

[0004] With existing rollers having fixed dimensions, when drawing fiber strips of different materials and qualities, in order to prevent a series of problems such as fiber strip deterioration, increased breakage, excessive floating fibers, inability to draw properly, and fiber damage, it is necessary to adjust the tension of the fiber strip using an adjustment device. Specifically, this involves adjusting the diameter of the roller. In existing technologies, the roller is usually removed and replaced with one of the required diameter, but this adjustment method is rather cumbersome and inconvenient. Summary of the Invention

[0005] Therefore, it is necessary to provide a tension-adjustable drafting device for roving frames to address the problems existing in current drafting devices, in order to solve the problem of cumbersome operation procedures when adjusting the diameter of the rollers.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A tension-adjustable drafting device for a roving frame includes:

[0008] frame;

[0009] Guide posts are mounted on the frame;

[0010] There are multiple lower roller mechanisms, which are located in front of the guide post and are arranged at intervals along the front-back direction and rotatably mounted on the frame.

[0011] There are multiple upper rollers, which are arranged at intervals along the front-to-back direction and rotated on the frame. They are also positioned above each lower roller mechanism and form a preset gap with the lower roller mechanism.

[0012] The lower roller mechanism includes a central tube, tapered insert rollers, and a first adjusting component. The central tube is rotatably mounted on the frame. There are an even number of tapered insert rollers, which are sequentially sleeved on the outside of the central tube along its axis. Two tapered insert rollers are grouped together, and the small ends of the two tapered insert rollers in the same group are interlocked, forming a "V-groove" shape at the connection. The first adjusting component is connected between the central tube and the tapered insert rollers and is used to control the two tapered insert rollers in the same group to move closer to or further apart from each other.

[0013] Preferably, the first adjusting assembly includes a bidirectional screw and guide posts. The bidirectional screw is sleeved inside the central tube and can rotate relative to the central tube around its axis. The outer side of the bidirectional screw is alternately provided with multiple first threaded grooves and second threaded grooves along its axis. The first threaded grooves and second threaded grooves rotate in opposite directions. There are multiple guide posts, which correspond one-to-one with multiple tapered insert rollers and are disposed on the inner circumference of the tapered insert rollers. A guide groove is opened on the outer side of the central tube and extends along the axis of the central tube. For two tapered insert rollers in the same group, the guide post corresponding to one tapered insert roller passes through the guide groove and is slidably connected in the first threaded groove, and the guide post corresponding to the other tapered insert roller passes through the guide groove and is slidably connected in the second threaded groove.

[0014] Preferably, a second adjustment component is provided between the frame and the central tube, the second adjustment component being used to adjust the distance between the central tube axis and the upper roller axis.

[0015] Preferably, the second adjusting component includes an outer bearing, a threaded sleeve, and a threaded pin. The frame has an installation groove, the outer bearing is movably disposed in the installation groove, the threaded sleeve is disposed on the outside of the outer bearing, and the threaded pin is rotatably disposed on the frame with its end threadedly connected to the threaded sleeve.

[0016] Preferably, a second driving member is provided on the outside of the frame, which is used to drive the central tube to rotate around its axis.

[0017] Preferably, the frame is further provided with a first driving member on its exterior, which is used to drive the upper roller to rotate about its axis.

[0018] Preferably, one end of the central tube is provided with a handle, and the end of the bidirectional screw near the handle is provided with a handwheel.

[0019] Preferably, a lower guide assembly is provided on the frame between two adjacent lower roller mechanisms, and an upper guide assembly is provided on the frame between two adjacent upper rollers. The upper guide assembly is located above the lower guide assembly, and the lower guide assembly and the upper guide assembly work together to assist the material in moving from back to front.

[0020] Preferably, the upper material guiding assembly includes a material guiding wheel, a material guiding belt, and a material guiding support. The material guiding wheel is rotatably mounted on the frame, the material guiding support is mounted on the frame, the material guiding belt is rotatably sleeved on the outside of the material guiding support, and the inner side of the material guiding belt is rotatably connected to the material guiding wheel.

[0021] Preferably, the lower guide assembly has the same structure as the upper guide assembly.

[0022] The beneficial effects of the present invention are:

[0023] This invention features a lower roller mechanism and an upper roller. When the draft and holding force of the roving wound onto the yarn roller are too high, the first adjusting component moves the two conical insert rollers in the same group further apart. This reduces the distance between the bottom of the "V-groove" and the axis of the conical insert roller, increasing tension. Consequently, the distance the fiber sliver can move in one rotation of the conical insert roller decreases, thus reducing the draft and holding force of the roving wound onto the yarn roller. Conversely, when the draft and holding force of the roving wound onto the yarn roller are insufficient, the two conical insert rollers in the same group move closer together to reduce tension. This increases the distance between the bottom of the "V-groove" and the axis of the conical insert roller, increasing the draft and holding force of the roving wound onto the yarn roller. In summary, the cooperation between the first adjusting component and the conical insert rollers allows for adjustment of the distance the fiber sliver can move in one rotation of the conical insert roller without disassembling the rollers, making operation simple and convenient. Attached Figure Description

[0024] Figure 1 This is an overall schematic diagram of a tension-adjustable drafting device for a roving frame according to the present invention;

[0025] Figure 2 This is a side view of a tension-adjustable drafting device for a roving frame according to the present invention;

[0026] Figure 3 for Figure 2 Sectional view of AA;

[0027] Figure 4 for Figure 2 BB section view;

[0028] Figure 5 This is a front view of a tension-adjustable drafting device for a roving frame according to the present invention;

[0029] Figure 6 for Figure 5 CC section view;

[0030] Figure 7 for Figure 5 DD section view;

[0031] Figure 8 This is a schematic diagram of the conical insert roller in a drafting device for a tension-adjustable roving frame according to the present invention;

[0032] Figure 9 This is a schematic diagram of the upper guide assembly in a tension-adjustable drafting device for a roving frame according to the present invention.

[0033] Figure 10 This is a schematic diagram of the lower roller mechanism in a tension-adjustable drafting device for a roving frame according to the present invention.

[0034] Figure 11 This is an exploded view of the conical insert roller in a tension-adjustable drafting device for a roving frame according to the present invention;

[0035] Figure 12 This is a schematic diagram showing the cooperation between the conical insert roller and the upper roller in a drafting device for a tension-adjustable roving frame according to the present invention;

[0036] Figure 13 for Figure 12 A magnified schematic diagram of the structure at point E in the middle;

[0037] Figure 14 This is a schematic diagram of the structure of the second drive component in a tension-adjustable drafting device for a roving frame according to the present invention.

[0038] in:

[0039] 100. Rack; 110. Mounting slot;

[0040] 200. Conductor post;

[0041] 300, Lower roller mechanism; 310, Central tube; 311, Guide groove; 320, Conical insert roller; 321, End retaining ring; 330, First adjusting assembly; 340, Handle; 350, Handwheel;

[0042] 331, double-ended screw; 3311, first threaded groove; 3312, second threaded groove; 332, guide post;

[0043] 400. Up Lola;

[0044] 500, Second adjusting assembly; 510, Outer bearing; 520, Threaded sleeve; 530, Threaded pin; 540, Inner bearing;

[0045] 600. First driving component;

[0046] 700, Second driving component; 710, Driven pulley; 720, Transmission belt; 730, First driving source; 740, Driving pulley; 750, Tensioner pulley;

[0047] 800. Upper guide assembly; 810. Guide wheel; 820. Guide belt; 830. Guide support; 840. Second drive source;

[0048] 900. Lower feeder assembly;

[0049] 1000, fiber strips. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0051] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0052] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0053] like Figures 1 to 14As shown, a tension-adjustable drafting device for a roving frame includes a frame 100, guide posts 200, lower roller mechanisms 300, and upper rollers 400. The guide posts 200 are mounted on the frame 100. Multiple lower roller mechanisms 300 are located in front of the guide posts 200, spaced apart along the front-rear direction and rotatably mounted on the frame 100. Multiple upper rollers 400 are also spaced apart along the front-rear direction and rotatably mounted on the frame 100, correspondingly positioned above each lower roller mechanism 300, forming a preset gap with each lower roller mechanism 300. The pulling mechanism 300 includes a central tube 310, tapered insert rollers 320, and a first adjusting component 330. The central tube 310 is rotatably mounted on the frame 100. There are an even number of tapered insert rollers 320, which are located outside the central tube 310 along its axis. Two tapered insert rollers 320 are grouped together, and the small ends of the two tapered insert rollers 320 in the same group are inserted into each other, forming a "V-groove" shape at the connection. The first adjusting component 330 is connected between the central tube 310 and the tapered insert rollers 320 and is used to control the two tapered insert rollers 320 in the same group to move closer to or further away from each other.

[0054] Initially, the coiled fiber sliver 1000 is wound onto the feed roller. When the fiber sliver 1000 is being drawn, the operator pulls one end of the fiber sliver 1000, causing it to pass over the guide post 200 and sequentially through multiple preset gaps formed by the lower roller mechanism 300 and the upper roller 400 from back to front. The fiber sliver 1000 is positioned within the "V-groove" formed by the insertion of the two tapered insert rollers 320 of the lower roller mechanism 300. Then, both the lower roller mechanism 300 and the corresponding upper roller 400 rotate circumferentially to draw the fiber sliver 1000 from back to front. Specifically, as follows... Figure 7 As shown, the rotational speed (angular velocity) of each lower roller mechanism 300 and the corresponding upper roller 400 increases from back to front, and the rotational speed of the lower roller mechanism 300 and the upper roller 400 at the same position in the front-back direction is the same. Since the rotational speed of each lower roller mechanism 300 and the corresponding upper roller 400 increases from back to front, the fiber sliver 1000 is stretched step by step from back to front. The stretched fiber sliver 1000 forms a roving that extends out from the preset gap at the frontmost side. At this time, the extended roving can be wound onto the yarn roller for further processing of the roving.

[0055] When the draft and holding force of the roving wound onto the yarn roller are insufficient, it is necessary to increase the draft of the roving. At this time, the operator uses the first adjusting component 330 to bring the two conical insert rollers 320 of the same group closer to each other by a certain distance to increase the tension. At this time, the distance between the bottom of the "V groove" and the axis of the conical insert roller 320 increases. In this way, without disassembling the roller, the distance that the fiber sliver 1000 can move in one revolution of the conical insert roller 320 can increase, so as to adapt to the situation where the draft and holding force of the roving need to be increased.

[0056] Conversely, when the draft and holding force of the roving wound onto the yarn roller are too large, it is necessary to reduce the draft of the lower roller mechanism 300. At this time, the operator uses the first adjusting component 330 to move the two conical insert rollers 320 of the same group away from each other by a certain distance to reduce the tension. At this time, the distance between the bottom of the "V groove" and the axis of the conical insert roller 320 is reduced, and the distance that the fiber sliver 1000 can move when the conical insert roller 320 rotates one revolution is reduced, so as to adapt to the situation where the draft and holding force of the roving need to be reduced.

[0057] It should also be noted that the "V-groove" design formed by the interlocking of the small ends of the two tapered insert rollers 320 can adapt to the situation where the fiber sliver 1000 is thick in the middle and thin on both sides, ensuring that the tension of the tapered insert rollers 320 and the fiber sliver 1000 is uniform in the width direction, which is beneficial to improving the drafting uniformity of the roving.

[0058] It should also be noted that when it is necessary to clean the fibrous impurities attached to the conical insert roller 320, the small ends of the two conical insert rollers 320 are brought close to each other to their extreme positions. During the process of the small ends of the two conical insert rollers 320 approaching each other, the fibrous impurities located in the slots of the conical insert rollers 320 will move directionally towards the large end of the conical insert rollers 320 and eventually collect at the large end of the conical insert rollers 320. This achieves the purpose of facilitating the cleaning of fibrous impurities on the conical insert rollers 320.

[0059] Furthermore, in order to drive the tapered insert roller 320 to rotate circumferentially, the tapered insert roller 320 sleeved on the outside of it can be driven to rotate synchronously by driving the central tube 310 to rotate circumferentially.

[0060] Furthermore, to prevent deformation of the small end of the tapered insert roller 320, an end fixing ring 321 is fitted around the outer periphery of the small end of the tapered insert roller 320. The end fixing ring 321 is formed by connecting two semi-circular ring bolts. During installation, the small ends of the two tapered insert rollers 320 are first inserted into each other, and then the end fixing ring 321 is spliced ​​and fixedly installed on the outside of the small end of the tapered insert roller 320.

[0061] In a further embodiment, such as Figure 10 and Figure 11 As shown, the first adjusting assembly 330 includes a bidirectional screw 331 and guide posts 332. The bidirectional screw 331 is sleeved inside the central tube 310 and can rotate relative to the central tube 310 around its axis. Multiple first threaded grooves 3311 and second threaded grooves 3312 are alternately arranged on the outside of the bidirectional screw 331 along its axis. The first threaded grooves 3311 and second threaded grooves 3312 rotate in opposite directions. There are multiple guide posts 332, and each guide post 332 corresponds to a multiple tapered insert roller 320. Correspondingly and disposed on the inner circumference of the tapered insert roller 320, the outer side of the central tube 310 is provided with a guide groove 311. The guide groove 311 extends along the axis of the central tube 310. Among the two tapered insert rollers 320 in the same group, the guide post 332 corresponding to one tapered insert roller 320 passes through the guide groove 311 and is slidably connected in the first threaded groove 3311. The guide post 332 corresponding to the other tapered insert roller 320 passes through the guide groove 311 and is slidably connected in the second threaded groove 3312.

[0062] When it is necessary to bring two tapered insert rollers 320 of the same group closer together, the operator holds the center tube 310 still with one hand, and then rotates the bidirectional screw 331 with the other hand. Under the limiting action of the guide groove 311, the bidirectional screw 331 drives the corresponding guide post 332 to move closer together along the guide groove 311 through the first threaded groove 3311 and the second threaded groove 3312 on it. Thus, the two guide posts 332 drive the corresponding tapered insert rollers 320 closer together. Conversely, when it is necessary to move two tapered insert rollers 320 of the same group further apart, the operator holds the center tube 310 still with one hand, and rotates the bidirectional screw 331 in the opposite direction with the other hand, thus moving the two tapered insert rollers 320 of the same group further apart.

[0063] Further, such as Figure 8 As shown, for ease of operation, a handle 340 is provided at one end of the central tube 310, and a handwheel 350 is provided at the end of the bidirectional screw 331 near the handle 340. In use, the operator holds the handle 340 with one hand to keep it stationary, and turns the handwheel 350 with the other hand.

[0064] In a further embodiment, such as Figure 6 , Figure 8 , Figure 10 As shown, a second adjustment component 500 is provided between the frame 100 and the center tube 310. The second adjustment component 500 is used to adjust the distance between the axis of the tapered insert roller 320 and the axis of the upper roller 400.

[0065] Understandably, the distance between the tapered insert roller 320 and the upper roller 400 should be maintained within a suitable range. When the distance between the tapered insert roller 320 and the upper roller 400 is small, the fiber strip 1000 will be subjected to greater compressive force within the preset gap. Conversely, when the distance between the tapered insert roller 320 and the upper roller 400 is large, the fiber strip 1000 will slide relative to both the tapered insert roller 320 and the upper roller 400. When two tapered insert rollers 320 in the same group move closer or further apart, the distance between the tapered insert roller 320 and the corresponding upper roller 400 will change. Therefore, it is necessary to adjust the distance between the axis of the tapered insert roller 320 and the axis of the upper roller 400 through the second adjusting component 500 to keep the distance between the tapered insert roller 320 and the upper roller 400 within a suitable range.

[0066] In a further embodiment, such as Figure 6 and Figure 10 As shown, the second adjustment assembly 500 includes an outer bearing 510, a threaded sleeve 520, and a threaded pin 530. The frame 100 has an installation groove 110. The outer bearing 510 is movably disposed in the installation groove 110. The inner ring of the outer bearing 510 is coaxially connected to the central tube 310. The threaded sleeve 520 is disposed on the outside of the outer bearing 510. The threaded pin 530 is rotatably disposed on the frame 100, and the end of the threaded pin 530 is threadedly connected to the threaded sleeve 520.

[0067] When it is necessary to reduce the distance between the tapered insert roller 320 and the upper roller 400, the operator rotates the threaded pin 530. Since the end of the threaded pin 530 is threadedly connected to the threaded sleeve 520, the rotation of the threaded pin 530 drives the threaded sleeve 520 to move upward along its own axis. The threaded sleeve 520 then drives the outer bearing 510 to move upward synchronously, which in turn drives the central tube 310 to move upward synchronously. Because the tapered insert roller 320 is fitted outside the central tube 310, it moves upward synchronously with the central tube 310, thus reducing the distance between the tapered insert roller 320 and the upper roller 400. Conversely, when it is necessary to increase the distance between the tapered insert roller 320 and the upper roller 400, the operator simply rotates the threaded pin 530 in the opposite direction. The specific process will not be described in detail here.

[0068] Further, such as Figure 6 As shown, since the inner ring diameter of the outer bearing 510 is larger than the diameter of the central tube 310, in order to connect the outer bearing 510 and the central tube 310, an inner bearing 540 is fitted inside the outer bearing 510, so that the outer ring diameter of the inner bearing 540 matches the inner ring diameter of the outer bearing 510, and the inner ring diameter of the inner bearing 540 matches the diameter of the central tube 310.

[0069] In a further embodiment, such as Figure 8 and Figure 14 As shown, a second driving member 700 is provided on the outside of the frame 100. The second driving member 700 is used to drive the central tube 310 to rotate around its axis. Specifically, the second driving member 700 includes a driven pulley 710, a transmission belt 720, a first driving source 730, a driving pulley 740, and a tensioning pulley 750. The driven pulley 710 is located at the end of the central tube 310. The first driving source 730 is located on the frame 100 and is a servo motor. The driving pulley 740 is fixedly connected to the output shaft of the first driving source 730. The transmission belt 720 is drivingly connected between the driven pulley 710 and the driving pulley 740. The frame 100 is also provided with a tensioning pulley 750, which is used to tension the transmission belt 720.

[0070] When in use, the first drive source 730 is started. The output shaft of the first drive source 730 drives the drive pulley 740 to rotate. The drive pulley 740 drives the driven pulley 710 to rotate through the transmission belt 720. The driven pulley 710 drives the center tube 310 to rotate. The center tube 310 drives the conical insert roller 320 to rotate.

[0071] In a further embodiment, such as Figure 8 As shown, the frame 100 is also provided with a first drive unit 600, which is a servo motor. The first drive unit 600 is used to drive the upper roller 400 to rotate around its axis.

[0072] When the upper roller 400 needs to rotate, the first drive unit 600 is activated, and the upper roller 400 is driven to rotate through the output shaft of the first drive unit 600.

[0073] In a further embodiment, such as Figure 7 As shown, a lower guide assembly 900 is provided on the frame 100 and between two adjacent lower roller mechanisms 300, and an upper guide assembly 800 is provided on the frame 100 and between two adjacent upper rollers 400. The upper guide assembly 800 is located above the lower guide assembly 900. The lower guide assembly 900 and the upper guide assembly 800 work together to assist the material, i.e. the fiber strip 1000, in moving from back to front.

[0074] During operation, the fiber strip 1000 is sandwiched between the upper guide assembly 800 and the lower guide assembly 900. After the upper guide assembly 800 and the lower guide assembly 900 are started, the fiber strip 1000 moves from back to front through the combined action of the upper guide assembly 800 and the lower guide assembly 900.

[0075] In addition, the upper guide assembly 800 is also used to support the fiber strip 1000 and prevent the fiber strip 1000 from sagging.

[0076] In a further embodiment, such as Figure 9 As shown, the upper material guiding assembly 800 includes a material guiding wheel 810, a material guiding belt 820, and a material guiding support 830. The material guiding wheel 810 is rotatably mounted on the frame 100. A second drive source 840 is mounted on the frame 100. The output shaft of the second drive source 840 is fixedly connected to the material guiding wheel 810. The material guiding support 830 is mounted on the frame 100. The material guiding belt 820 is rotatably sleeved on the outside of the material guiding support 830, and the inner side of the material guiding belt 820 is rotatably connected to the material guiding wheel 810.

[0077] During operation, the servo motor is started, and the output shaft of the servo motor drives the guide wheel 810 to rotate. The guide wheel 810 drives the guide belt 820 to rotate circumferentially around the guide support 830. The outer side of the guide belt 820 abuts against the fiber strip 1000, thus assisting the fiber strip 1000 to move directionally from back to front.

[0078] In a further embodiment, such as Figure 7 As shown, the lower guide assembly 900 and the upper guide assembly 800 have the same structure, the difference being that the rotation direction of the guide wheel 810 of the lower guide assembly 900 is opposite to that of the guide wheel 810 of the upper guide assembly 800.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A drafting device for a tension-adjustable roving frame, characterized in that, include: frame; Guide posts are mounted on the frame; There are multiple lower roller mechanisms, which are located in front of the guide post and are arranged at intervals along the front-back direction and rotatably mounted on the frame. There are multiple upper rollers, which are arranged at intervals along the front-to-back direction and rotated on the frame. They are also positioned above each lower roller mechanism and form a preset gap with the lower roller mechanism. The lower roller mechanism includes a central tube, tapered insert rollers, and a first adjusting assembly. The central tube is rotatably mounted on the frame. There are an even number of tapered insert rollers, sequentially sleeved around the central tube along its axis. Two tapered insert rollers are grouped together, with their small ends interlocking to form a "V-groove" at the connection point. The first adjusting assembly connects the central tube and the tapered insert rollers, controlling whether the two tapered insert rollers in the same group move closer or further apart. The first adjusting assembly includes a bidirectional screw and a guide post. The bidirectional screw is sleeved inside the central tube and can... Relative to the rotation of the central tube around its axis, the outer side of the bidirectional screw is alternately provided with multiple first threaded grooves and second threaded grooves along its axis. The first threaded grooves and second threaded grooves rotate in opposite directions. There are multiple guide posts, which correspond one-to-one with multiple tapered insert rollers and are arranged on the inner circumference of the tapered insert rollers. The outer side of the central tube is provided with a guide groove that extends along the axis of the central tube. For two tapered insert rollers in the same group, the guide post corresponding to one tapered insert roller passes through the guide groove and is slidably connected in the first threaded groove, and the guide post corresponding to the other tapered insert roller passes through the guide groove and is slidably connected in the second threaded groove.

2. The tension-adjustable drafting device for a roving frame according to claim 1, characterized in that, A second adjustment component is provided between the frame and the central tube. The second adjustment component is used to adjust the distance between the axis of the central tube and the axis of the upper roller.

3. The tension-adjustable drafting device for a roving frame according to claim 2, characterized in that, The second adjustment assembly includes an outer bearing, a threaded sleeve, and a threaded pin. A mounting groove is provided on the frame. The outer bearing is movably mounted in the mounting groove. The threaded sleeve is located on the outside of the outer bearing. The threaded pin is rotatably mounted on the frame, and the end of the threaded pin is threadedly connected to the threaded sleeve.

4. The tension-adjustable drafting device for a roving frame according to claim 1, characterized in that, The frame is provided with a second driving member on its exterior, which is used to drive the central tube to rotate around its axis.

5. The tension-adjustable drafting device for a roving frame according to claim 1, characterized in that, The frame is also provided with a first driving member on its exterior, which is used to drive the upper roller to rotate around its axis.

6. The tension-adjustable drafting device for a roving frame according to claim 1, characterized in that, One end of the central tube is provided with a handle, and a handwheel is provided at the end of the bidirectional screw near the handle.

7. The tension-adjustable drafting device for a roving frame according to claim 1, characterized in that, A lower guide assembly is provided on the frame between two adjacent lower roller mechanisms, and an upper guide assembly is provided on the frame between two adjacent upper rollers. The upper guide assembly is located above the lower guide assembly. The lower guide assembly and the upper guide assembly work together to assist the material in moving from back to front.

8. The tension-adjustable drafting device for a roving frame according to claim 7, characterized in that, The upper material guiding assembly includes a material guiding wheel, a material guiding belt, and a material guiding support. The material guiding wheel is rotatably mounted on the frame, the material guiding support is mounted on the frame, the material guiding belt is rotatably sleeved on the outside of the material guiding support, and the inner side of the material guiding belt is rotatably connected to the material guiding wheel.

9. A drafting device for a tension-adjustable roving frame according to claim 8, characterized in that, The lower feeding assembly has the same structure as the upper feeding assembly.

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