Tension-adjustable drafting device for roving frame

Abstract

The invention relates to the technical field of spinning equipment, in particular to a tension-adjustable drafting device for a roving frame, which comprises a frame, a yarn guide post, a plurality of lower roller mechanisms and an upper roller, the yarn guide post is arranged on the frame, the plurality of lower roller mechanisms are positioned on the front side of the yarn guide post, and the upper roller is arranged on the frame. The lower roller mechanisms are arranged on the rack, are arranged at intervals in the front-back direction and are rotationally arranged on the rack, the upper rollers are arranged at intervals in the front-back direction and are rotationally arranged on the rack, the lower roller mechanisms are correspondingly arranged above the lower roller mechanisms, and preset gaps are formed between the lower roller mechanisms and the upper rollers. The lower roller mechanism and the upper roller are arranged, through cooperation of the first adjusting assembly and the conical insertion type roller, under the condition that the roller is not detached, the moving distance of a drafted fiber strip can be adjusted when the conical insertion type roller rotates by a circle, and therefore the purpose of adjusting the tension of the roving frame is achieved, and operation is easy, convenient and fast.

Description

Technical Field

[0001] The invention relates to the technical field of spinning equipment, in particular to a tension-adjustable drafting device for a roving frame. Background Art

[0002] The roving frame is a spinning equipment that turns fiber strips into roving. Its main functions are to stretch, twist, and wind the roving into a certain roll shape to meet the requirements of the spinning frame processing.

[0003] The roving frame consists of three main parts: a drafting device, a twisting device and a winding device. The drafting device stretches and thins the fiber strips through the speed difference of rollers and other hanging parts, causing relative displacement between fibers to achieve the specified linear density. For example, the rear roller feeds the fiber strips at a slower speed, and the front roller outputs them at a faster speed, thereby stretching and thinning the fiber strips.

[0004] The existing rollers have certain size specifications. When stretching fiber strips of different materials and qualities, in order to prevent a series of problems such as deterioration of the fiber strips, increased breakage, excessive floating fibers, inability to stretch, and fiber damage, it is necessary to adjust the tension of the fiber strips by the device. Specifically, the diameter of the roller is adjusted. To adjust the diameter of the roller, in the existing technology, the roller is usually removed and replaced with a roller of the required diameter. However, this adjustment method is relatively cumbersome and inconvenient to operate. Summary of the Invention

[0005] Based on this, it is necessary to provide a tension-adjustable drafting device for a roving frame to address the problems existing in the current drafting device of the roving frame, so as to solve the problem of complicated operating steps when adjusting the diameter of the roller.

[0006] The above purpose is achieved through the following technical solutions: A tension-adjustable drafting device for a roving frame comprises: frame; A conductor post is provided on the frame; There are multiple lower roller mechanisms, which are located in front of the conductor column and are spaced apart in the front-to-back direction and rotatably mounted on the frame; There are multiple top rollers, which are arranged at intervals along the front-to-back direction and rotatably arranged on the frame, and are correspondingly arranged above each bottom roller mechanism, and form a preset gap between them and the bottom roller mechanism; The lower roller mechanism includes a center tube, a conical plug-in roller and a first adjustment component. The center tube is rotatably set on the frame. There are an even number of conical plug-in rollers, which are sequentially sleeved on the outside of the center tube along the axis of the center tube. Two conical plug-in rollers are divided into a group. The small ends of the two conical plug-in rollers in the same group are plugged into each other, forming a "V-groove" shape at the connection. The first adjustment component is connected between the center tube and the conical plug-in roller, and is used to control the two conical plug-in rollers in the same group to approach or move away from each other.

[0007] Preferably, the first adjusting component includes a bidirectional screw and a guide column, the bidirectional screw is sleeved on the inner side of the center tube, and the bidirectional screw can rotate around its axis relative to the center tube, and the outside of the bidirectional screw is alternately provided with multiple sections of first thread grooves and second thread grooves along its axis, and the first thread grooves and the second thread grooves rotate in opposite directions. There are multiple guide columns, and the multiple guide columns correspond one-to-one to the multiple conical plug-in rollers and are arranged on the inner circumference of the conical plug-in roller. A guide groove is opened on the outside of the center tube, and the guide groove extends along the axis of the center tube. For the two conical plug-in rollers in the same group, the guide column corresponding to one of the conical plug-in rollers passes through the guide groove and is slidably connected in the first thread groove, and the guide column corresponding to the other conical plug-in roller passes through the guide groove and is slidably connected in the second thread groove.

[0008] Preferably, a second adjustment component is provided between the frame and the center tube, and the second adjustment component is used to adjust the distance between the axis of the center tube and the axis of the upper roller.

[0009] Preferably, the second adjustment component includes an outer bearing, a threaded sleeve and a threaded pin. A mounting groove is provided on the frame, the outer bearing is movably arranged in the mounting groove, the threaded sleeve is arranged on the outside of the outer bearing, the threaded pin is rotatably arranged on the frame and the end of the threaded pin is threadedly connected to the threaded sleeve.

[0010] Preferably, a second driving member is provided on the outside of the frame, and the second driving member is used to drive the central tube to rotate around its axis.

[0011] Preferably, a first driving member is further provided on the outside of the frame, and the first driving member is used to drive the top roller to rotate around its axis.

[0012] Preferably, a handle is provided at one end of the central tube, and a handwheel is provided at one end of the bidirectional screw near the handle.

[0013] Preferably, a lower material guide assembly is provided on the frame and located between two adjacent lower roller mechanisms, and an upper material guide assembly is provided on the frame and located between two adjacent upper rollers. The upper material guide assembly is located above the lower material guide assembly, and the lower material guide assembly and the upper material guide assembly work together to assist the material in moving from back to front.

[0014] Preferably, the upper material guide assembly includes a material guide wheel, a material guide belt and a material guide support. The material guide wheel is rotatably set on the frame, the material guide support is set on the frame, the material guide belt is rotatably sleeved on the outside of the material guide support, and the inner side of the material guide belt is rotatably connected to the material guide wheel.

[0015] Preferably, the lower material guiding component has the same structure as the upper material guiding component.

[0016] The beneficial effects of the present invention are: The present invention is provided with a lower roller mechanism and an upper roller. When the drafting amount and the holding force of the coarse yarn wound onto the yarn roller are too large, the two conical plug rollers of the same group are moved away from each other through the first adjusting component. At this time, the distance between the bottom of the "V-groove" and the axis of the conical plug roller is reduced to increase the tension. At this time, the distance that the conical plug roller can draw the fiber strip when it rotates one circle is reduced, thereby reducing the drafting amount and the holding force of the coarse yarn wound onto the yarn roller. When the drafting amount and the holding force of the coarse yarn wound onto the yarn roller are insufficient, the two conical plug rollers of the same group are moved closer to each other to reduce the tension. At this time, the distance between the bottom of the "V-groove" and the axis of the conical plug roller is increased, thereby increasing the drafting amount and the holding force of the coarse yarn wound onto the yarn roller. In summary, through the cooperation of the first adjusting component and the conical plug roller, the distance that the conical plug roller can draw the fiber strip when it rotates one circle can be adjusted without disassembling the roller, so the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an overall schematic diagram of a tension-adjustable drafting device for a roving frame according to the present invention; Figure 2 A side view of a tension-adjustable drafting device for a roving frame according to the present invention; Figure 3 for Figure 2 Middle AA section view; Figure 4 for Figure 2 Middle BB cross-section; Figure 5 This is a front view of a tension-adjustable drafting device for a roving frame according to the present invention; Figure 6 for Figure 5 Middle CC section view; Figure 7 for Figure 5 Middle DD section view; Figure 8 This is a schematic structural diagram of a tapered insert roller in a tension-adjustable drafting device for a roving frame according to the present invention; Figure 9 This is a schematic structural diagram of an upper material guide assembly in a tension-adjustable drafting device for a roving frame according to the present invention; Figure 10 This is a schematic structural diagram of a lower roller mechanism in a tension-adjustable drafting device for a roving frame according to the present invention; Figure 11 This is an exploded view of a tapered insert roller in a tension-adjustable drafting device for a roving frame according to the present invention; Figure 12 This is a schematic diagram of the coordination of a tapered insert roller and a top roller in a tension-adjustable drafting device for a roving frame according to the present invention; Figure 13 for Figure 12 Schematic diagram of the enlarged structure at E in the middle; Figure 14 The figure is a schematic structural diagram of a second driving member in a tension-adjustable drafting device for a roving frame according to the present invention.

[0018] in: 100, rack; 110, mounting slot; 200, conductor column; 300, bottom roller mechanism; 310, center tube; 311, guide groove; 320, tapered plug-in roller; 321, end fixing ring; 330, first adjustment assembly; 340, handle; 350, handwheel; 331, bidirectional screw; 3311, first thread groove; 3312, second thread groove; 332, guide post; 400, top roller; 500, second adjustment assembly; 510, outer bearing; 520, threaded sleeve; 530, threaded pin; 540, inner bearing; 600, first driving member; 700, second driving member; 710, driven pulley; 720, transmission belt; 730, first driving source; 740, driving pulley; 750, tensioning pulley; 800, upper material guide assembly; 810, material guide wheel; 820, material guide belt; 830, material guide support; 840, second drive source; 900, lower material guide assembly; 1000. Fiber strips. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0020] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0021] 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.

[0022] like Figures 1 to 14 As shown, a tension-adjustable drafting device for a roving machine includes a frame 100, a conductor post 200, a lower roller mechanism 300 and an upper roller 400. The conductor post 200 is arranged on the frame 100. There are multiple lower roller mechanisms 300. The multiple lower roller mechanisms 300 are located in front of the conductor post 200 and are arranged at intervals along the front-to-back direction and are rotatably arranged on the frame 100. There are multiple upper rollers 400. The multiple upper rollers 400 are arranged at intervals along the front-to-back direction and are rotatably arranged on the frame 100 and are correspondingly configured above each lower roller mechanism 300, and a preset gap is formed between the lower roller mechanism 300 and the lower roller mechanism 300. The pulling mechanism 300 includes a center tube 310, a conical plug-in roller 320 and a first adjustment component 330. The center tube 310 is rotatably set on the frame 100. There are an even number of conical plug-in rollers 320, and they are arranged on the outside of the center tube 310 along the axis of the center tube 310. Two conical plug-in rollers 320 are divided into a group. The small ends of the two conical plug-in rollers 320 in the same group are plugged into each other, forming a "V-groove" shape at the connection. The first adjustment component 330 is connected between the center tube 310 and the conical plug-in roller 320, and is used to control the two conical plug-in rollers 320 in the same group to approach or move away from each other.

[0023] In the initial state, the rolled fiber strip 1000 is wound on the feeding roller. When the fiber strip 1000 is stretched, the staff pulls one end of the fiber strip 1000 so that the fiber strip 1000 passes over the wire rod 200 and passes through a plurality of preset gaps formed by the lower roller mechanism 300 and the upper roller 400 from back to front, and the fiber strip 1000 is located in the "V-groove" formed by the two conical plug-in rollers 320 of the lower roller mechanism 300. Then, the lower roller mechanism 300 and the corresponding upper roller 400 are rotated circumferentially to stretch the fiber strip 1000 from back to front. Specifically, 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-to-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 strip 1000 is stretched step by step from back to front. After stretching, the fiber strip 1000 forms a coarse yarn that extends out from the preset gap on the front side. At this time, the extended coarse yarn can be wound onto the yarn roller to facilitate further processing of the coarse yarn.

[0024] When the drafting amount and holding force of the coarse yarn wound onto the yarn roller are insufficient, the drafting amount of the coarse yarn needs to be increased. At this time, the staff uses the first adjustment component 330 to make the two conical plug rollers 320 of the same group approach 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 plug roller 320 is increased. In this way, the distance that the conical plug roller 320 can stretch the fiber strip 1000 when it rotates one circle can be increased without disassembling the roller, so as to adapt to the situation where the drafting amount and holding force of the coarse yarn need to be increased.

[0025] On the contrary, when the drafting amount and holding force of the coarse yarn wound onto the yarn roller are too large, it is necessary to reduce the drafting amount of the lower roller mechanism 300. At this time, the staff uses the first adjustment component 330 to make the two conical plug rollers 320 in the same group move 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 plug roller 320 is reduced, and the distance that the conical plug roller 320 can stretch the fiber strip 1000 to move after one rotation is reduced, so as to adapt to the situation where the drafting amount and holding force of the coarse yarn need to be reduced.

[0026] It should also be added that the "V-groove" design formed by the mutual insertion of the small ends of the two conical plug-in rollers 320 can adapt to the situation where the fiber strip 1000 is thick in the middle and thin on both sides, ensuring that the pulling force between the conical plug-in roller 320 and the fiber strip 1000 is uniform at all positions in the width direction, which is conducive to improving the drafting uniformity of the coarse yarn.

[0027] It should also be noted that when it is necessary to clean the fiber impurities attached to the conical plug roller 320, the small ends of the two conical plug rollers 320 are brought close to each other to the extreme position. In the process of the small ends of the two conical plug rollers 320 approaching each other, the fiber impurities located in the slots of the conical plug rollers 320 will move toward the large end of the conical plug roller 320 and finally gather at the large end of the conical plug roller 320, thereby achieving the purpose of facilitating the cleaning of the fiber impurities on the conical plug roller 320.

[0028] Furthermore, in order to drive the conical insert roller 320 to rotate circumferentially, the conical insert roller 320 sleeved on the outside of the central tube 310 can be driven to rotate circumferentially synchronously.

[0029] Furthermore, in order to prevent the small end of the conical plug-in roller 320 from being deformed, an end fixing ring 321 is provided on the outer periphery of the small end of the conical plug-in roller 320. The end fixing ring 321 is formed by connecting two semicircular ring bolts. During the specific installation, the small ends of the two conical plug-in rollers 320 are first plugged into each other, and then the end fixing ring 321 is spliced ​​and fixedly installed on the outside of the small end of the conical plug-in roller 320.

[0030] In a further embodiment, Figure 10 and Figure 11 As shown, the first adjustment component 330 includes a bidirectional screw 331 and a guide post 332. The bidirectional screw 331 is sleeved on the inner side of the central tube 310, and the bidirectional screw 331 can rotate around its axis relative to the central tube 310. The outer portion of the bidirectional screw 331 is alternately provided with multiple sections of first thread grooves 3311 and second thread grooves 3312 along its axis. The first thread grooves 3311 and the second thread grooves 3312 rotate in opposite directions. There are multiple guide posts 332, and the multiple guide posts 332 are aligned with the multiple tapered plug-in rollers 320. Corresponding to and arranged on the inner circumference of the conical plug-in roller 320, a guide groove 311 is opened on the outside of the center tube 310, and the guide groove 311 extends along the axis of the center tube 310. In the two conical plug-in rollers 320 of the same group, the guide column 332 corresponding to one of the conical plug-in rollers 320 passes through the guide groove 311 and is slidably connected in the first thread groove 3311, and the guide column 332 corresponding to the other conical plug-in roller 320 passes through the guide groove 311 and is slidably connected in the second thread groove 3312.

[0031] When the two tapered insert rollers 320 in the same group need to be brought closer together, the staff member fixes the central tube 310 with one hand to keep it stationary, and then uses the other hand to rotate the bidirectional screw 331. Under the limiting action of the guide groove 311, the bidirectional screw 331 drives the corresponding two guide posts 332 along the guide groove 311 toward each other through the first thread groove 3311 and the second thread groove 3312 provided thereon, thereby driving the corresponding tapered insert rollers 320 toward each other. Conversely, when the two tapered insert rollers 320 in the same group need to be moved away from each other, the staff member fixes the central tube 310 with one hand to keep it stationary, and uses the other hand to rotate the bidirectional screw 331 in the opposite direction, thereby moving the two tapered insert rollers 320 in the same group away from each other.

[0032] Further, such as Figure 8 As shown, in order to facilitate the operation of the staff, a handle 340 is provided at one end of the central tube 310, and a hand wheel 350 is provided at one end of the bidirectional screw 331 near the handle 340. When in use, the staff holds the handle 340 with one hand to keep it still and rotates the hand wheel 350 with the other hand.

[0033] In a further embodiment, Figure 6 、 Figure 8 、 Figure 10 As shown, a second adjustment assembly 500 is provided between the frame 100 and the central tube 310 , and the second adjustment assembly 500 is used to adjust the distance between the axis of the tapered insert roller 320 and the axis of the top roller 400 .

[0034] It is understood that the spacing between the conical plug roller 320 and the top roller 400 should be maintained within an appropriate range. When the spacing between the conical plug roller 320 and the top roller 400 is small, the fiber strip 1000 will be subjected to a greater extrusion force within the preset gap. Conversely, when the spacing between the conical plug roller 320 and the top roller 400 is large, the fiber strip 1000 will slide relative to the conical plug roller 320 and the top roller 400. When two conical plug rollers 320 in the same group move closer to or farther away from each other, the spacing between the conical plug roller 320 and the corresponding top roller 400 will change. Therefore, the second adjustment assembly 500 is required to adjust the spacing between the axis of the conical plug roller 320 and the axis of the top roller 400 to maintain the spacing between the conical plug roller 320 and the top roller 400 within an appropriate range.

[0035] In a further embodiment, Figure 6 and Figure 10As shown, the second adjustment assembly 500 includes an outer bearing 510, a threaded sleeve 520 and a threaded pin 530. A mounting groove 110 is provided on the frame 100. The outer bearing 510 is movably arranged in the mounting groove 110. The inner ring of the outer bearing 510 is coaxially connected to the center tube 310. The threaded sleeve 520 is arranged on the outside of the outer bearing 510. The threaded pin 530 is rotatably arranged on the frame 100, and the end of the threaded pin 530 is threadedly connected to the threaded sleeve 520.

[0036] When the distance between the tapered insert roller 320 and the top roller 400 needs to be reduced, 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, and the outer bearing 510 drives the center tube 310 to move upward synchronously. Since the tapered insert roller 320 is mounted on the outside of the center tube 310, the tapered insert roller 320 moves upward synchronously with the center tube 310, thereby reducing the distance between the tapered insert roller 320 and the top roller 400. Conversely, when the distance between the tapered insert roller 320 and the top roller 400 needs to be increased, the operator simply rotates the threaded pin 530 in the opposite direction. The specific process is not repeated here.

[0037] Further, such as Figure 6 As shown, since the inner ring diameter of the outer bearing 510 is larger than the diameter of the center tube 310, in order to connect the outer bearing 510 and the center tube 310, the inner bearing 540 is sleeved on the inner side of the outer bearing 510, so that the outer ring diameter of the inner bearing 540 is adapted to the inner ring diameter of the outer bearing 510, and the inner ring diameter of the inner bearing 540 is adapted to the diameter of the center tube 310.

[0038] In a further embodiment, Figure 8 and Figure 14 As shown, a second driving member 700 is provided on the outside of the frame 100, and the second driving member 700 is used to drive the central tube 310 to rotate about 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 provided at the end of the central tube 310, the first driving source 730 is provided on the frame 100, and the first driving source 730 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 transmission-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.

[0039] When in use, the first driving source 730 is started, and the output shaft of the first driving source 730 drives the active pulley 740 to rotate, and the active pulley 740 drives the driven pulley 710 to rotate through the transmission belt 720, and the driven pulley 710 drives the center tube 310 to rotate, and the center tube 310 drives the conical plug-in roller 320 to rotate.

[0040] In a further embodiment, Figure 8 As shown, a first driving member 600 is further provided on the outside of the frame 100. The first driving member 600 is a servo motor. The first driving member 600 is used to drive the top roller 400 to rotate around its axis.

[0041] When the top roller 400 needs to rotate, the first driving member 600 is started, and the top roller 400 is driven to rotate via the output shaft of the first driving member 600.

[0042] In a further embodiment, Figure 7 As shown, a lower material guide assembly 900 is provided on the frame 100 and located between two adjacent lower roller mechanisms 300, and an upper material guide assembly 800 is provided on the frame 100 and located between two adjacent upper rollers 400. The upper material guide assembly 800 is located above the lower material guide assembly 900. The lower material guide assembly 900 and the upper material guide assembly 800 work together to assist the material, i.e., the fiber strip 1000, to move from back to front.

[0043] During operation, the fiber strip 1000 is clamped between the upper material guide component 800 and the lower material guide component 900. After the upper material guide component 800 and the lower material guide component 900 are started, the upper material guide component 800 and the lower material guide component 900 work together to assist the fiber strip 1000 to move from back to front.

[0044] In addition, the upper material guide assembly 800 is also used to support the fiber strip 1000 to prevent the fiber strip 1000 from sagging.

[0045] In a further embodiment, Figure 9 As shown, the upper material guide assembly 800 includes a material guide wheel 810, a material guide belt 820 and a material guide support 830. The material guide wheel 810 is rotatably set on the frame 100. A second driving source 840 is set on the frame 100. The output shaft of the second driving source 840 is fixedly connected to the material guide wheel 810. The material guide support 830 is set on the frame 100. The material guide belt 820 is rotatably sleeved on the outside of the material guide support 830, and the inner side of the material guide belt 820 is rotatably connected to the material guide wheel 810.

[0046] During operation, the servo motor is started, and the guide wheel 810 is driven to rotate through the output shaft of the servo motor. The guide wheel 810 drives the guide belt 820 to rotate circumferentially around the guide support 830. The outer side surface of the guide belt 820 is against the fiber strip 1000, thereby assisting the fiber strip 1000 to move in a directional manner from back to front.

[0047] In a further embodiment, Figure 7 As shown, the lower material guiding assembly 900 has the same structure as the upper material guiding assembly 800 , except that the rotation direction of the guide wheel 810 of the lower material guiding assembly 900 is opposite to that of the guide wheel 810 of the upper material guiding assembly 800 .

[0048] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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.

[0049] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A tension-adjustable drafting device for a roving frame, characterized in that: include: frame; A conductor post is provided on the frame; There are multiple lower roller mechanisms, which are located in front of the conductor column and are spaced apart in the front-to-back direction and rotatably mounted on the frame; There are multiple top rollers, which are arranged at intervals along the front-to-back direction and rotatably arranged on the frame, and are correspondingly arranged above each bottom roller mechanism, and form a preset gap between them and the bottom roller mechanism; The lower roller mechanism includes a center tube, a conical plug-in roller and a first adjustment component. The center tube is rotatably set on the frame. There are an even number of conical plug-in rollers, which are sequentially sleeved on the outside of the center tube along the axis of the center tube. Two conical plug-in rollers are divided into a group. The small ends of the two conical plug-in rollers in the same group are plugged into each other, forming a "V-groove" shape at the connection. The first adjustment component is connected between the center tube and the conical plug-in roller, and is used to control the two conical plug-in rollers in the same group to approach or move away from each other.

2. A tension-adjustable drafting device for a roving frame according to claim 1, characterized in that: The first adjusting component includes a bidirectional screw and a guide column. The bidirectional screw is sleeved on the inner side of the center tube, and the bidirectional screw can rotate around its axis relative to the center tube. The outside of the bidirectional screw is alternately provided with multiple sections of first thread grooves and second thread grooves along its axis. The first thread grooves and the second thread grooves rotate in opposite directions. There are multiple guide columns, and the multiple guide columns correspond one-to-one to the multiple tapered plug-in rollers and are arranged on the inner circumference of the tapered plug-in roller. A guide groove is opened on the outside of the center tube, and the guide groove extends along the axis of the center tube. Two tapered plug-in rollers in the same group, the guide column corresponding to one of the tapered plug-in rollers passes through the guide groove and is slidably connected in the first thread groove, and the guide column corresponding to the other tapered plug-in roller passes through the guide groove and is slidably connected in the second thread groove.

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

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

5. The tension-adjustable drafting device for a roving frame according to claim 1, characterized in that: A second driving member is provided on the outside of the frame, and the second driving member is used to drive the central tube to rotate around its axis.

6. A tension-adjustable drafting device for a roving frame according to claim 1, characterized in that: A first driving member is also provided on the outside of the frame, and the first driving member is used to drive the top roller to rotate around its axis.

7. The tension-adjustable drafting device for a roving frame according to claim 1, characterized in that: A handle is provided at one end of the central tube, and a hand wheel is provided at one end of the bidirectional screw rod close to the handle.

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

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

10. A tension-adjustable drafting device for a roving frame according to claim 9, characterized in that: The lower material guiding component has the same structure as the upper material guiding component.

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