Filter stick tow opening auxiliary device and opening auxiliary method

Abstract

The invention discloses a filter stick tow opening auxiliary device and an opening auxiliary method, and relates to the technical field of tobacco processing, and the filter stick tow opening auxiliary device comprises a guide plate, an arc-shaped groove, a protrusion and a swing guide rod. The arc-shaped groove is matched with the swinging guide rod, and when the swinging guide rod swings to a first position, an adaptive advancing gap is formed by pressing down the tow band, so that the tow band obtains longitudinal transition friction pre-stretching in a tensioning state, stable guiding is assisted, and crimped fibers are stretched preliminarily; the staggered protrusions form a non-smooth contact surface, differential friction force and distributed transverse carding force are provided for the advancing tow band, adhesion fibers are dispersed in an auxiliary mode to achieve transverse pre-opening, the opening uniformity of the tow band is improved through cooperation of the differential friction force and the distributed transverse carding force, and the situation that part of monofilaments are opened insufficiently is avoided; furthermore, the local curling and gathering phenomenon in subsequent forming is relieved, and the white point defect of the filter stick is improved.

Description

Technical Field

[0001] This application relates to the field of tobacco processing technology, specifically to a filter rod bundle opening auxiliary device and opening auxiliary method. Background Technology

[0002] Fiber acetate tow, as a core raw material in the production of cigarette filters, directly affects key indicators such as filter performance and pressure drop stability. Its production requires a complete set of core processes: first, the tow is made into finished fibers through steps such as slurry preparation, spinning, curling, drying, and packaging, and then transported to the cigarette filter production workshop for further processing. During the filter forming process, the tow must first undergo a loosening process in the forming machine's opening module to break its original curled state, and then be rolled with forming paper to form a continuous filter strip. After the filter strip is slit, the final cigarette filter rod meets the required specifications.

[0003] In the opening process, the primary opening guide plate is a key transition component for the yarn bundle as it enters subsequent opening stages. Traditional primary opening guide plates have a smooth transition structure (e.g., ...). Figure 8 As shown), after the filament bundle enters the first-stage air opening via the guide ring, it needs to be guided to the subsequent roller group by the smooth guide plate.

[0004] However, because the smooth adjacent surfaces of the smooth guide plate cannot provide differentiated friction and lateral combing effect, the filament bundle is difficult to achieve effective pre-opening and stable guidance, resulting in uneven opening of the filament bundle and insufficient opening of some single filaments. Consequently, it is easy to form local curling and aggregation in subsequent forming, which ultimately manifests as white spot defects in the filter rod. Summary of the Invention

[0005] The main objective of this application is to provide a filter rod filament loosening auxiliary device and loosening auxiliary method, which aims to solve the technical problem that the smooth adjacent surface of the traditional smooth guide plate cannot provide differentiated friction and lateral combing effect, making it difficult for the filament belt to achieve effective pre-loosening and stable guidance, resulting in uneven loosening of the filament belt, insufficient loosening of some single filaments, and easy formation of local curling and aggregation in subsequent forming, which ultimately manifests as white spot defects in the filter rod.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A filter rod fiber bundle opening auxiliary device includes a fiber bundle belt, and further includes:

[0008] The guide plate has a contact surface for the filament bundle to travel, and has an arc-shaped groove along its width direction;

[0009] The protrusions are provided on the contact surface of the wire bundle of the guide plate, and are arranged alternately along the width direction of the guide plate.

[0010] A swing guide rod is movably provided above the arc-shaped groove. The swing guide rod has a first position. When the swing guide rod is in the first position, it coincides with the axis of the arc-shaped groove, and its rod body and the bottom of the arc-shaped groove form a gap for the wire bundle to pass through.

[0011] Optionally, the guide plate has a wavy inlet section, a raised section and a straight outlet section that are smoothly connected in sequence along the direction of the filament bundle travel. Two arc-shaped grooves are arranged at intervals along the width direction of the raised section, and each arc-shaped groove is arranged through the raised section along its length direction.

[0012] Optionally, protrusions are distributed in the smooth connection area between the wavy inlet section and the raised section, between the two arc-shaped grooves, and in the smooth connection area between the raised section and the straight outlet section.

[0013] Optionally, the swing guide rod is provided with an L-shaped mounting base at one end along its length, and a lever cylinder is mounted on the upright plate of the L-shaped mounting base, with the movable end of the lever cylinder connected to one end along the length of the swing guide rod.

[0014] Optionally, the upright plate of the L-shaped mounting base has a first connecting hole for mounting the lever cylinder along its thickness direction; the arc-shaped groove has a second connecting hole along its thickness direction at one end near the L-shaped mounting base, and the bottom plate of the L-shaped mounting base has a third connecting hole corresponding to the second connecting hole along its thickness direction.

[0015] Optionally, a fourth connecting hole is provided on the side of the corrugated guide section away from the raised section along its thickness direction, and three fourth connecting holes are spaced apart along the length direction of the corrugated guide section, and a primary air opening plate seat is provided at the fourth connecting hole.

[0016] Optionally, the wavy inlet section, the raised section, and the straight outlet section are integrally formed.

[0017] Optionally, the protrusion is a columnar boss, and the end of the columnar boss away from the guide plate adopts a smooth arc-shaped rounded corner transition.

[0018] A method for assisting in the opening of filter rod filament bundles, applied to the filter rod filament bundle opening assisting device as described above, the method comprising:

[0019] Control the swing guide rod to swing to the second position, so that it forms an inclined angle with the arc-shaped groove, the inclined angle being greater than 0°;

[0020] The control wire bundle passes through the inclined space between the swing guide rod and the arc-shaped groove;

[0021] Control the swing guide rod to swing to the first position, so that its axis coincides with the axis of the arc-shaped groove, and press the wire bundle into the arc-shaped groove, keeping the wire bundle from contacting the bottom of the arc-shaped groove;

[0022] Control the movement of the filament belt so that it continuously passes over the oscillating guide rod in the first position and the staggered protrusions on the guide plate.

[0023] Optionally, when the swing guide rod is in the first position, the angle of inclination formed by it and the arc-shaped groove is 0°.

[0024] The technical solution provided in this application can include the following beneficial effects: This application sets an arc-shaped groove extending along the width direction and a movable swing guide rod on the contact surface of the filament belt of the guide plate, and arranges a number of protrusions arranged alternately along the width direction on the contact surface, so that the surface of the guide plate forms a rough surface, avoiding the shortcomings of traditional smooth guide plates that lack differentiated friction and transverse combing effect: The arc-shaped groove, in conjunction with the swing guide rod, forms a suitable travel gap by pressing down on the filament belt when the swing guide rod swings to the first position, so that the filament belt obtains longitudinal transition friction pre-stretching under tension, which helps to stabilize the guidance and initially unwind the curled fibers; The alternately arranged protrusions form a non-smooth contact surface, providing differentiated friction and dispersed transverse combing force for the traveling filament belt, helping to disperse the adhering fibers to achieve transverse pre-opening. The two work together to improve the opening uniformity of the filament belt, avoid the situation of insufficient opening of some single filaments, and thus alleviate the local curling and aggregation phenomenon in subsequent forming, and improve the white spot defect of the filter rod. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the filter rod fiber bundle opening auxiliary device;

[0027] Figure 2 This is a schematic diagram of the operation of the filter rod filament bundle loosening auxiliary device;

[0028] Figure 3 These are schematic diagrams of the three-dimensional and two-dimensional structures of the guide plate;

[0029] Figure 4 These are schematic diagrams of the three-dimensional and two-dimensional structures of the swing guide rod;

[0030] Figure 5 This is a schematic diagram of the three-dimensional and two-dimensional structure of the L-shaped mounting base;

[0031] Figure 6 It is a schematic diagram of the raised three-dimensional structure and the planar structure;

[0032] Figure 7This is a structural diagram showing the connection between the primary air opening plate seat and the corrugated inlet section;

[0033] Figure 8 This is a structural diagram of the traditional opening process.

[0034] Reference numerals: 1. First-stage air opener; 2. Second-stage air opener; 3. Third-stage air opener; 4. Guide ring; 5. First-stage opening guide plate; 6. Wire bundle; 7. Guide plate; 8. Arc-shaped groove; 9. Protrusion; 10. Swinging guide rod; 11. Corrugated inlet section; 12. Raised section; 13. Straight outlet section; 14. L-shaped mounting base; 15. Vertical plate; 16. Lever cylinder; 17. First connecting hole; 18. Second connecting hole; 19. Base plate; 20. Third connecting hole; 21. Fourth connecting hole; 22. First-stage air opener plate seat. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] Example 1:

[0037] See Figures 1 to 3 A filter rod fiber bundle opening auxiliary device includes a fiber bundle belt 6, and further includes:

[0038] The guide plate 7 has a contact surface for the filament bundle 6 to travel, and an arc-shaped groove 8 is provided along its width direction;

[0039] The protrusions 9 are provided on the contact surface of the wire bundle 6 of the guide plate 7, and are arranged alternately along the width direction of the guide plate 7.

[0040] Among them, a swing guide rod 10 is movably provided above the arc-shaped groove 8. The swing guide rod 10 has a first position. When the swing guide rod 10 is in the first position, it coincides with the axis of the arc-shaped groove 8, and its rod body and the bottom of the arc-shaped groove 8 form a gap for the wire bundle 6 to pass through.

[0041] Specifically, the traditional filter rod filament opening process, such as Figure 8As shown in the figure, 1 is the first-stage air opener 1, 2 is the second-stage air opener 2, 3 is the third-stage air opener 3, 4 is the guide ring 4, and 5 is the first-stage opening guide plate 5. The opening process is as follows: the curled filament bundle 6 enters the first-stage air opener 1 through the guide ring 4, undergoes lateral pre-opening and air-blowing, and is then pulled by the second-stage air opener 2 to the brake roller group without driving force, and then pulled by the subsequent roller group. A certain speed difference is maintained between the motor-driven input roller group and the extension roller group; generally, the extension roller group is faster than the input roller group. This generates longitudinal tension, forming a longitudinal opening of the filament bundle 6. The input drive roller and the extension drive roller are identical threaded rollers, which, through roller pressure and threads, create lateral opening of the passing filament bundle 6. By alternately clamping and releasing the filament bundle fibers between the threads, the filament bundle 6 is evenly extended and relaxed, and the curled parts are staggered and their arrangement is disrupted. The guide roller group generally operates at a slower speed than the stretching roller group. It provides a certain degree of curl recovery to the filament belt 6 and controls the amount of filament fed to the winding section of the forming machine, thereby controlling the weight of the filter rod. It should be noted that this process is existing technology and will not be described in detail here.

[0042] However, the traditional first-stage opening guide plate 5 has a smooth structure. Since the smooth adjacent surface of the smooth guide plate cannot provide differentiated friction and lateral combing effect, the filament belt 6 is difficult to achieve effective pre-opening and stable guidance. As a result, the opening state of the filament belt 6 is uneven, and some single filaments are not opened enough. This makes it easy to form local curling and aggregation in the subsequent forming process, which ultimately manifests as white spot defects in the filter rod.

[0043] See Figures 1 to 3 This application provides a filter rod fiber bundle opening auxiliary device, wherein the guide plate 7 is a primary opening guide plate. The fiber bundle 6 travels along the surface of the guide plate 7, and the guide plate 7 provides support for its movement. An arc-shaped groove 8 is formed along the width direction of the guide plate 7, and the length direction of the arc-shaped groove 8 is consistent with the width direction of the guide plate 7. A swing guide rod 10 is movably disposed above the arc-shaped groove 8 and has a swing function. The arc-shaped groove 8 provides a positioning reference for the swing guide rod 10 and also provides a suitable space for the movement of the fiber bundle 6 after it is pressed, achieving pre-stretching of the fiber bundle 6 in conjunction with the downward pressure of the swing guide rod 10. Initially, the swing guide rod 10 swings away from the arc-shaped groove 8, forming an inclined angle greater than 0° with the arc-shaped groove 8. That is, the swing guide rod 10 is in an inclined state relative to the arc-shaped groove 8, forming an inclined space between the swing guide rod 10 and the arc-shaped groove 8, thereby facilitating the passage of the fiber bundle 6.

[0044] As the filament bundle 6 passes through the inclined space, the control swing guide rod 10 swings, causing it to swing towards the arc-shaped groove 8 to the first position. At this point, the swing guide rod 10 forms a 0° inclined angle with the arc-shaped groove 8, the axis of the swing guide rod 10 coincides with the axis of the arc-shaped groove 8, and a gap is formed between the rod body of the swing guide rod 10 and the bottom of the arc-shaped groove 8. Under the downward pressure of the swing guide rod 10, the filament bundle 6 is pressed into the arc-shaped groove 8 without contacting the bottom of the arc-shaped groove 8. In this way, during the movement of the filament bundle 6, the downward pressure of the swing guide rod 10 will give the filament bundle a longitudinal transition friction pre-stretch.

[0045] The protrusions 9 are located on the contact surface of the fiber bundle 6 on the guide plate 7, and are arranged alternately along the width direction of the guide plate 7. That is, the arrangement direction of the protrusions 9 is consistent with the length direction of the swing guide rod 10 and the arc-shaped groove 8. By staggering the protrusions 9 along the width direction of the guide plate 7, the surface of the guide plate 7 is made rough, which makes up for the lack of differentiated friction of the traditional smooth guide plate 7. It forms a dispersed transverse (width direction of the guide plate 7) combing force on the traveling fiber bundle 6, and at the same time provides differentiated friction force, laying a uniform fiber bundle state for the subsequent opening process. Furthermore, when the fiber bundle 6 travels, the fibers in different areas will come into contact with the protrusions 9 at different positions and be subjected to differentiated combing force. The originally sticky fibers will be dispersed laterally (width direction of the guide plate 7). This transverse dispersion effect replaces the uncombed state of the traditional smooth guide plate 7, realizing the transverse pre-opening of the fiber bundle 6.

[0046] Working effect: This application sets an arc-shaped groove 8 extending along the width direction and a movable swing guide rod 10 on the contact surface of the filament belt 6 of the guide plate 7. At the same time, several protrusions 9 are arranged alternately along the width direction on the contact surface, so that the surface of the guide plate 7 is rough. This avoids the shortcomings of traditional smooth guide plates 7, which lack differentiated friction and transverse combing effect. The arc-shaped groove 8, together with the swing guide rod 10, forms a suitable travel gap by pressing down on the filament belt 6 when the swing guide rod 10 swings to the first position. This allows the filament belt 6 to obtain longitudinal transition friction pre-stretching under tension, which helps to stabilize the guide and initially unwind the curled fibers. The alternately arranged protrusions 9 form a non-smooth contact surface, which provides differentiated friction and dispersed transverse combing force for the traveling filament belt 6. This helps to disperse the adhering fibers to achieve transverse pre-opening. The two work together to improve the opening uniformity of the filament belt 6, avoid the situation of insufficient opening of some single filaments, and thus alleviate the local curling and aggregation phenomenon in subsequent forming and improve the white spot defect of the filter rod.

[0047] Example 2:

[0048] See Figure 1 and 3Based on Embodiment 1, optionally, the guide plate 7 has a wavy inlet section 11, a raised section 12 and a straight outlet section 13 that are smoothly connected in sequence along the traveling direction of the filament belt 6. Two arc-shaped grooves 8 are arranged at intervals along the width direction of the raised section 12, and each arc-shaped groove 8 is arranged through the raised section 12 along the length direction of the raised section 12.

[0049] Specifically, the smoothly connected corrugated structure guides the traveling filament belt 6 to smoothly transition to the raised section 12, avoiding deviation or wrinkling caused by sudden changes in direction when the filament belt 6 enters the working area. At the same time, it can form a light preliminary combing of the filament belt 6, laying the foundation for subsequent tensioning and pre-stretching. The raised section 12 provides suitable installation and working space for the arc-shaped groove 8 and the swing guide rod 10, so that when the swing guide rod 10 presses down, it holds the filament belt 6 to form a stable tension state. The straight guide section 13, through its straight structure, allows the filament belt 6, which has been pre-stretched and laterally pre-opened, to smoothly transition to the subsequent process, reducing the state fluctuation of the filament belt 6 when leaving the guide plate 7, and ensuring the stability of the filament belt 6 when entering the next level of opening or conveying structure. The two through-type arc-shaped grooves 8 are arranged at intervals along the width direction of the raised section 12, which can adapt to different areas in the width direction of the filament belt 6, so that the double swing guide rod 10 forms a double-point pressure on the filament belt 6, increasing the duration and coverage of the pre-stretching effect, and can more effectively unwind the curled fibers.

[0050] Optionally, protrusions 9 are distributed in the smooth connection area between the wavy inlet section 11 and the raised section 12, between the two arc-shaped grooves 8, and in the smooth connection area between the raised section 12 and the straight outlet section 13.

[0051] Specifically, each of the three regions has protrusions 9. This differentiated layout avoids the uneven combing caused by a single-region distribution, and also avoids the problems of excessive local resistance and sudden changes in fiber tension that may be caused by a continuous distribution across the entire area. At the same time, the presence of protrusions 9 in all three regions ensures that the fiber bundle continuously receives differentiated friction and lateral combing during its journey across the entire guide plate 7 surface, further improving the problems of uneven fiber opening and local curling and aggregation, and providing a stable fiber bundle foundation for subsequent processes.

[0052] Example 3:

[0053] See Figures 1 to 5 Based on the above embodiments, optionally, the swing guide rod 10 is provided with an L-shaped mounting base 14 at one end along its length, and a lever cylinder 16 is mounted on the upright plate 15 of the L-shaped mounting base 14, and the movable end of the lever cylinder 16 is connected to one end along the length of the swing guide rod 10.

[0054] Specifically, the L-shaped mounting base 14, through the fitting installation of the upright plate 15 and the lever cylinder 16, provides a stable fixed reference for the cylinder. Simultaneously, its structural form matches the installation posture of the swing guide rod 10, allowing the moving end of the cylinder to connect with one end of the swing guide rod 10 along its length, ensuring that the driving force is transmitted along the swing trajectory of the swing guide rod 10. The lever cylinder 16, as a power actuator, can output controllable swing driving force and angle, achieving a smooth switch of the swing guide rod 10 from its initial tilted state (second position) to its first position. This satisfies both the obstacle avoidance requirements when the filament belt 6 is inserted and the ability to operate smoothly during operation. The swing guide rod 10 provides uniform and stable downward pressure, ensuring the holding effect of the swing guide rod 10 on the filament bundle when it cooperates with the arc-shaped groove 8, thereby achieving longitudinal transition friction pre-stretching. In addition, the cylinder parameters (such as swing angle and driving force) can be adjusted to adapt to the holding requirements of different specifications of filament bundles 6, improving the versatility of the device. At the same time, it works in synergy with the three-section structure of the guide plate 7 and the distribution of the protrusions 9 to ensure that the movement of the swing guide rod 10 matches the travel state of the filament bundle 6 during the introduction, pre-stretching, and export processes, ensuring the synergistic effect of pre-stretching and lateral pre-opening.

[0055] Optionally, the upright plate 15 of the L-shaped mounting base 14 has a first connecting hole 17 for mounting the lever cylinder 16 along its thickness direction; the arc-shaped groove 8 has a second connecting hole 18 along its thickness direction at one end near the L-shaped mounting base 14, and the bottom plate 19 of the L-shaped mounting base 14 has a third connecting hole 20 corresponding to the second connecting hole 18 along its thickness direction.

[0056] Specifically, the first connecting hole 17 is adapted to the mounting connecting hole of the lever cylinder 16 to fix the cylinder on the vertical plate 15 of the L-shaped mounting base 14. This ensures the stability of the cylinder after installation, preventing shaking during operation, and also controls the installation height and horizontal position of the movable end of the lever cylinder 16, ensuring its coaxiality with the swing guide rod 10 along its length, so that the driving force is transmitted along the swing trajectory of the swing guide rod 10. The second connecting hole 18 is opened at one end of the arc-shaped groove 8 near the L-shaped mounting base 14 and serves as the mounting reference for the L-shaped mounting base 14. It provides structural protection for the swing guide rod 10 to coincide with the axis of the arc-shaped groove 8 when it swings to the first position.

[0057] The third connecting hole 20 corresponds to the second connecting hole 18. By passing fasteners (such as screws) through the third connecting hole 20 and the second connecting hole 18, the base plate 19 of the L-shaped mounting seat 14 is firmly fixed to the guide plate 7. This achieves a rigid connection between the L-shaped mounting seat 14 and the guide plate 7, and ensures that the mounting seat 14 is installed without deviation through the hole correspondence. This allows the lever cylinder 16 on the upright plate 15 to match the position of the swing guide rod 10 at the arc groove 8.

[0058] See Figure 3 and7 Optionally, a fourth connecting hole 21 is provided on the side of the corrugated guide section 11 away from the raised section 12 along its thickness direction, and three fourth connecting holes 21 are distributed at intervals along the length direction of the corrugated guide section 11. A primary air opening plate seat 22 is provided at the fourth connecting hole 21.

[0059] Specifically, the three fourth connecting holes 21, evenly distributed at multiple points, enhance the stability of the connection between the primary air loosening plate seat 22 and the guide plate 7, preventing the guide plate 7 from deforming or shifting under the impact of the yarn bundle's movement. The primary air loosening plate seat 22, guide ring 4 (not shown in the figure), guide plate 7, swing guide rod 10, lever cylinder 16, and L-shaped mounting base 14 constitute the first-stage air loosening device. During normal production, the yarn bundle 6 passes through the guide ring 4, then through the primary air loosening plate seat 22, and then sequentially passes through two swing guide rods 10. The yarn bundle 6 is initially stretched at the two swing guide rods 10 and laterally unfolded on the protrusion 9 before entering the brake roller for loosening, making the loosening of the yarn bundle 6 more stable. The primary air loosening plate seat 22 is provided with an inverted V-shaped air slit to facilitate outward air blowing, providing pre-loosening airflow assistance for the yarn bundle 6 before it enters the guide plate 7. This is existing technology and will not be described in detail here.

[0060] Optionally, the wavy inlet section 11, the raised section 12, and the straight outlet section 13 are integrally formed.

[0061] Specifically, the one-piece molding design avoids structural gaps, assembly deviations, and weak strength problems that may occur with segmented splicing. First, it improves the overall structural rigidity and load-bearing stability of the guide plate 7, making it less prone to deformation or displacement when subjected to the impact of the filament bundle's movement, thus providing a reliable structural foundation for the realization of the three-section structure's function. Second, this design ensures the smoothness and positional accuracy of the connection between the corrugated inlet section 11 and the raised section 12, and between the raised section 12 and the straight outlet section 13, avoiding problems such as inter-segment misalignment and abrupt transitions that may occur with segmented splicing, allowing the filament bundle 6 to smoothly complete the guide along the surface of the guide plate 7. The entire process from entry transition—core pre-stretching / lateral loosening—exit shaping reduces filament shift, tension abrupt changes, or wrinkles caused by poor inter-segment connection. In addition, the one-piece molding can also ensure the positional accuracy of functional structures such as arc groove 8 and protrusion 9, ensuring their coordinated action with components such as swing guide rod 10 and lever cylinder 16, avoiding the impact of segment assembly errors on pre-stretching uniformity and lateral loosening effect, while improving the durability of guide plate 7, reducing functional decay caused by inter-segment loosening during long-term use, and providing structural guarantee for the overall device to stably improve filter rod white spot defects and enhance loosening consistency.

[0062] See Figure 1 and 5 Optionally, the protrusion 9 is a columnar boss, and the end of the columnar boss away from the guide plate 7 adopts a smooth arc-shaped rounded corner transition.

[0063] Specifically, as the basic structure for differentiated friction and transverse combing, the columnar shape can provide a stable height and contact area of ​​the protrusion 9. Its independent columnar layout forms a distributed force point. Combined with the staggered arrangement along the width direction of the guide plate 7, it can form a multi-point, discontinuous transverse resistance to the traveling filament bundle 6, ensuring that the adhering fibers can be effectively dispersed and transverse pre-opening can be achieved. The rounded corners eliminate the sharp edges at the top of the protrusion 9, reducing stress concentration when the filament belt 6 contacts the protrusion 9 during its movement. This prevents sharp structures from snagging or cutting the filament fibers, ensuring the integrity of the filament and avoiding new local aggregation problems caused by fiber breakage. The arc-shaped transition surface allows the filament belt 6 to slide smoothly when it contacts the protrusion 9, reducing abrupt changes in contact resistance and preventing the filament from getting stuck or experiencing tension fluctuations in the area of ​​the protrusion 9. This ensures that the filament continues to travel stably along the surface of the guide plate 7, providing a continuous filament state for the longitudinal pre-stretching of the swing guide rod 10. The rounded corner design, through uniform contact pressure distribution, makes the friction between the filament belt 6 and each columnar protrusion more gentle and controllable, further improving the uniformity of transverse combing and avoiding uneven filament stretching caused by excessive local friction.

[0064] Example 4:

[0065] Based on the above embodiments, this application provides an opening assistance method, applied to the filter rod filament tow opening assistance device as described above, the method comprising:

[0066] Control the swing guide rod 10 to swing to the second position, so that it forms an inclined angle with the arc-shaped groove 8, the inclined angle being greater than 0°;

[0067] The control wire bundle 6 passes through the inclined space between the swing guide rod 10 and the arc-shaped groove 8;

[0068] Control the swing guide rod 10 to swing to the first position, so that its axis coincides with the axis of the arc groove 8, and press the wire bundle 6 into the arc groove 8, keeping the wire bundle 6 from contacting the bottom of the arc groove 8;

[0069] The control thread 6 is moved so that it continuously passes over the oscillating guide rod 10 in the first position and the staggered protrusions 9 on the guide plate 7.

[0070] Specifically, the lever cylinder 16 drives the swing guide rod 10 to swing, switching the swing guide rod 10 to the second position. At this time, the swing guide rod 10 and the arc-shaped groove 8 form an inclined angle greater than 0°. This angle creates an open inclined space between them, providing sufficient operating space for the insertion of the filament bundle 6. The preferred angle range for the second position is 15° to 45°. This angle range can provide sufficient open space for filament bundles 6 of different specifications, avoiding the difficulty of insertion or the problem of filament edge rubbing caused by too small an angle. It can also effectively control the swing amplitude of the swing guide rod 10, preventing redundant stroke of the lever cylinder 16 caused by too large an angle, and loosening or displacement caused by excessive attitude adjustment after the filament is inserted. At the same time, this range can ensure that the swing guide rod 10 has a reasonable stroke and efficient response when switching from the second position to the first position.

[0071] The filament belt 6 is guided by the guide ring 4 and the primary air opening plate seat 22, travels along the surface of the corrugated inlet section 11 of the guide plate 7, passes through the inclined space between the swing guide rod 10 and the guide plate 7, and enters the subsequent roller group after passing through the straight outlet section 13 of the guide plate 7.

[0072] The control lever cylinder 16 reverses its action, driving the swing guide rod 10 to swing towards the arc-shaped groove 8 until it switches to the first position: at this time, the swing guide rod 10 and the arc-shaped groove 8 form a 0° angle (parallel state), its axis coincides with the axis of the arc-shaped groove 8, and the rod body of the swing guide rod 10 presses down on the wire bundle 6, so that the wire bundle 6 fits into the arc-shaped groove 8, while maintaining the gap between the wire bundle 6 and the bottom of the arc-shaped groove 8 to avoid the wire bundle 6 from contacting the bottom of the groove;

[0073] Under the continuous pulling action of the subsequent roller group, the filament belt 6 continuously travels along the surface of the guide plate 7, passing through the two arc-shaped grooves 8 areas, and forming frictional contact with the double swing guide rods 10 in the first position, thereby applying a moderate and uniform longitudinal pre-tension to the filament belt 6. At the same time, during its travel, the filament belt 6 successively passes through the smooth connection area between the wavy introductory section 11 and the raised section 12, the area between the two arc-shaped grooves 8, and the smooth connection area between the raised section 12 and the straight outtroductory section 13. The raised sections form a transverse combing effect on the traveling filament belt 6, dispersing the adhering fibers and achieving transverse loosening. Finally, it is smoothly output to the subsequent process through the straight outtroductory section 13.

[0074] This application first controls the swing guide rod 10 to swing to the second position to form an inclined space, ensuring that the filament belt 6 can be smoothly inserted; then the swing guide rod 10 is driven to switch to the first position, so that the filament belt 6 is pressed with the axis coincidence to embed it into the arc-shaped groove 8 and maintain a gap with the bottom of the groove, forming a gentle and controllable longitudinal transition friction pre-stretch during the movement of the filament belt 6; the filament belt 6 passes through the bosses in three specific areas in sequence during continuous movement, and gradually disperses the adhering fibers through the differential friction and dispersed transverse combing provided by the bosses, so that the filament belt 6 obtains a uniform pre-opening effect, reduces the situation of insufficient opening of some monofilaments, and thus alleviates the local curling and aggregation in the subsequent forming process, and improves the white spot defect of the filter rod.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A filter rod tow opening aid device comprising a tow band (6), characterized in that, Also include: The guide plate (7) has a contact surface for the travel of the tow band (6), and an arc-shaped groove (8) is opened along the width direction thereof; The convex (9) is arranged on the contact surface of the tow band (6) of the guide plate (7), and a plurality of convexes are arranged in staggered intervals along the width direction of the guide plate (7); Wherein, the arc-shaped groove (8) is movably provided with a swing guide rod (10) above, the swing guide rod (10) has a first position, when the swing guide rod (10) is in the first position, the axis of the swing guide rod (10) coincides with the axis of the arc-shaped groove (8), and the rod body and the groove bottom of the arc-shaped groove (8) form a gap for the tow band (6) to pass through.

2. A filter rod tow opening aid according to claim 1 characterised in that, The guide plate (7) has a wave-shaped leading-in section (11), a raised section (12) and a straight leading-out section (13) which are smoothly connected in sequence along the travel direction of the tow band (6), the arc-shaped groove (8) is arranged in two intervals along the width direction of the raised section (12), and each arc-shaped groove (8) is provided in a penetrating manner along the length direction of the raised section (12).

3. A filter rod tow opening aid according to claim 2, characterised in that The smoothly connected area of the wave-shaped leading-in section (11) and the raised section (12), the two arc-shaped grooves (8) and the smoothly connected area of the raised section (12) and the straight leading-out section (13) are all distributed with convexes (9).

4. A filter rod tow opening aid according to claim 3 characterised in that The swing guide rod (10) is provided with an L-shaped mounting seat (14) at one end of the length direction, the vertical plate (15) of the L-shaped mounting seat (14) is provided with a lever air cylinder (16), and the movable end of the lever air cylinder (16) is connected with one end of the length direction of the swing guide rod (10).

5. A filter rod tow opening aid according to claim 4, characterised in that The vertical plate (15) of the L-shaped mounting seat (14) is provided with a first connecting hole (17) along the thickness direction thereof for mounting the lever air cylinder (16); one end of the arc-shaped groove (8) close to the L-shaped mounting seat (14) is provided with a second connecting hole (18) along the thickness direction thereof, and the bottom plate (19) of the L-shaped mounting seat (14) is provided with a third connecting hole (20) corresponding to the second connecting hole (18) along the thickness direction thereof.

6. A filter rod tow opening aid according to claim 5, characterised in that The wave-shaped leading-in section (11) is provided with a fourth connecting hole (21) on the side away from the raised section (12) along the thickness direction thereof, and the fourth connecting hole (21) is distributed in three intervals along the length direction of the wave-shaped leading-in section (11), and a first-stage air opening plate seat (22) is arranged at the fourth connecting hole (21).

7. A filter rod toasting aid according to claim 3 characterised in that The wave-shaped leading-in section (11), the raised section (12) and the straight leading-out section (13) are integrally formed.

8. A filter rod toasting aid according to claim 1 characterised in that, The convex (9) is a columnar boss, and the end of the columnar boss away from the guide plate (7) is transitioned by a smooth arc-shaped fillet.

9. An opening assisting method characterized by, The method is applied to the filter rod tow opening auxiliary device of any one of claims 1-8, and the method comprises: Control the swing guide rod (10) to swing to the second position, so that the swing guide rod (10) and the arc-shaped groove (8) form an inclined angle, and the inclined angle is greater than 0°; Control the tow band (6) to pass through the inclined space between the swing guide rod (10) and the arc-shaped groove (8); Control the swing guide rod (10) to swing to the first position, so that the axis of the swing guide rod (10) coincides with the axis of the arc-shaped groove (8), and press down the tow band (6) into the arc-shaped groove (8), so that the tow band (6) does not contact the groove bottom of the arc-shaped groove (8); The tows tape (6) is controlled to travel continuously through the swing guide rod (10) in the first position and the protrusions (9) arranged alternately on the guide plate (7).

10. The opening assistance method according to claim 9, characterized by, When the swing guide rod (10) is in the first position, the swing guide rod (10) and the arc-shaped groove (8) form an included angle of 0°.

Images