Outer curve cigarette filter stick forming device

Abstract

The invention provides an outer curve cigarette filter stick forming device which comprises a driving belt wheel, a first belt wheel, a second belt wheel and a conveying belt, and the driving belt wheel and the first belt wheel are sleeved with an inner ring of the conveying belt; the outer ring of the conveyor belt sleeves the second belt wheel, the second belt wheel is adjacent to the first belt wheel, and the conveyor belt rotates to drive the first belt wheel and the second belt wheel to rotate relatively; a first cylinder is arranged above the first belt wheel, a second cylinder is arranged above the second belt wheel, a corresponding first rolling cutter groove is formed in the side face of the first cylinder, and a corresponding second rolling cutter groove is formed in the side face of the second cylinder. The filter stick passes through a gap formed by the first roller cutter groove and the second roller cutter groove, and external threads corresponding to the lines of the first roller cutter groove and the second roller cutter groove are pressed. Through the reverse winding design of the inner ring and the outer ring of the conveying belt, the first belt wheel and the second belt wheel form a natural reverse synchronous rotation relation, and the quality defects such as jumping grains and overlapping grains are effectively overcome.

Description

Technical Field

[0001] This application belongs to the field of tobacco filter rod manufacturing, and specifically relates to an externally curved tobacco filter rod forming device. Background Technology

[0002] In the tobacco production industry, filter rods, as a core component of cigarettes, directly affect the filtration efficiency, smoking taste, and overall quality of cigarettes through their structure and performance. With increasing consumer awareness of healthy smoking, filter rods with external thread structures have become a hot research topic in the industry due to their unique advantages. This structure, by creating regular undulating patterns on the filter rod surface, prolongs the residence time of smoke within the filter rod, increases the contact area with the filter material, and reduces the amount of tar and nicotine transferred compared to traditional smooth filter rods. It also optimizes airflow disturbance during smoking, resulting in a smoother and more mellow taste. Currently, it has been widely applied in mid-to-high-end cigarette products, and annual demand continues to increase.

[0003] In existing technologies, the forming mechanism of filter rod external threads mainly relies on the relative movement of paired roller grooves: a drive device drives a pulley assembly arranged symmetrically up and down or left and right to rotate, causing the roller grooves to form a reverse synchronous extrusion trajectory, pressing the continuously conveyed filter rod blank into a preset thread pattern. However, the current driving system design of the forming device has multiple technical bottlenecks:

[0004] First, the drive structure is redundant and complex. Traditional devices generally adopt an independent drive mode of "one drive and one pulley," for example, by connecting two servo motors to reducers, which then drive the corresponding pulleys. Some devices also require additional intermediate components such as gearboxes and couplings to ensure transmission accuracy. The drive system of mainstream equipment contains a large number of core components, significantly more than the solution of this invention. This not only makes the equipment assembly process cumbersome, but also increases the processing accuracy requirements due to the need for coordination among multiple components, directly leading to a significant increase in manufacturing costs.

[0005] Secondly, the synchronization control precision is insufficient. The synchronous operation of multi-drive systems relies on complex electrical control systems, and factors such as motor speed fluctuations and accumulated transmission backlash can easily cause "phase differences"—when the pulley speed deviates, the timing of the roller groove's compression of the filter rod is misaligned, resulting in periodic skewness of the thread pattern, and in severe cases, defects such as "skipped threads" and "overlapping threads" occur. In actual production, the defect rate of filter rods caused by such synchronization errors is high, far exceeding the industry average standard, and the subsequent sorting and rejection process requires additional manpower and time costs.

[0006] Third, energy consumption and maintenance costs are high. In multi-motor drive mode, the no-load power of the equipment is higher, significantly increasing compared to single-drive solutions, which will lead to a substantial increase in energy consumption over a long period of time. At the same time, the distributed drive structure increases the number of failure points, and problems such as bearing wear and motor overheating occur frequently. The average monthly downtime for maintenance of the production line is much longer than that of the optimized integrated drive solution, which seriously affects the continuity of production.

[0007] Fourth, poor spatial adaptability. Traditional equipment occupies a large area due to the dispersed arrangement of drive components. However, cigarette production lines often need to integrate multiple processes such as cutting and rolling within a limited space. The large size of the equipment limits the flexibility of the production line layout, and some old factories even need to modify their infrastructure to adapt, further increasing the transformation costs for enterprises. Summary of the Invention

[0008] In view of this, the purpose of this application is to provide an external curve tobacco filter rod forming device to solve the above problems.

[0009] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0010] This application provides an external curve cigarette filter rod forming device, which includes: a drive pulley, a first pulley, a second pulley, and a conveyor belt. The inner ring of the conveyor belt surrounds the drive pulley and the first pulley; the outer ring of the conveyor belt surrounds the second pulley, which is adjacent to the first pulley. The rotation of the conveyor belt drives the first pulley and the second pulley to rotate relative to each other. A first cylinder is provided above the first pulley, and a second cylinder is provided above the second pulley. The side of the first cylinder is provided with a corresponding first roller cutter groove, and the side of the second cylinder is provided with a corresponding second roller cutter groove. The filter rod passes through the gap formed by the first roller cutter groove and the second roller cutter groove and is pressed to form an external thread corresponding to the pattern of the first roller cutter groove and the second roller cutter groove.

[0011] Furthermore, the external curve cigarette filter rod forming device also includes: a tensioning structure, which includes a tensioning pulley, a first slide rail, a first slider, and a spring assembly. The tensioning pulley, drive pulley, and first pulley are triangularly encased by the inner ring of the conveyor belt. The first slide rail is parallel to the axis connecting the first pulley and the tensioning pulley. The tensioning pulley is fixed on the first slider, and the first slider slides back and forth on the first slide rail. The spring assembly includes a connecting rod, a spring, and a lever. The connecting rod is fixed to the frame, and one end of the connecting rod is provided with a stop. One end of the lever is sleeved on the connecting rod, and the other end of the lever is connected to the first slider. The spring is sleeved on the connecting rod and located between the lever and the stop.

[0012] Furthermore, the external curve cigarette filter rod forming device also includes a frame, a tensioning mechanism, and a pressing mechanism. The tensioning mechanism includes a slide rail, a slider, and a spring assembly. The slide rail is fixed on the frame and parallel to the axis connecting the first pulley and the tensioning pulley. The tensioning pulley is fixed on the slider. The spring assembly includes a connecting rod, a spring, and a lever. The connecting rod is fixed on the frame and has a stop at one end. One end of the lever is movably sleeved on the connecting rod, and the other end is fixedly connected to the slider. The spring is sleeved on the connecting rod, and both ends abut against the lever and the stop, respectively. The conveyor belt passes around the first pulley and the second pulley in an S-shape, and then sleeves the drive pulley and the tensioning pulley at both ends, forming a closed transmission path.

[0013] Furthermore, the external curve tobacco filter rod forming device also includes: a second slide rail, a second slider and a third slider. The second slide rail is arranged perpendicularly to the first slide rail. The first pulley and the second pulley are respectively arranged on the second slider and the third slider. Both the second slider and the third slider slide on the second slide rail.

[0014] Furthermore, the external curve tobacco filter rod forming device also includes a pin that passes through a slide rail and is used to limit the second and third sliders.

[0015] Furthermore, the connecting rod is a screw rod, which is threadedly connected to the frame body, and the preset tension of the tensioning pulley can be adjusted by rotating the connecting rod.

[0016] Furthermore, the external curve cigarette filter rod forming device is configured to adjust the external curve cigarette filter rod forming device according to the following steps: Step S1: Rotate the connecting rod so that the lever drives the first slider to slide on the first slide rail, thereby adjusting the tension of the tensioning pulley on the conveyor belt; Step S2: The plunger is installed on the second slide rail, and the pin is inserted into the plunger to restrict the movement of the plunger, thereby adjusting the distance between the second pulley and the end of the second slide rail, and realizing the adjustment of the longitudinal position of the first roller cutter groove.

[0017] As can be seen from the above technical solution, the advantages and positive effects of the external curve tobacco filter rod forming device proposed in this application are as follows:

[0018] (1) Breakthrough improvement in transmission efficiency and synchronization accuracy: The integrated transmission scheme of single drive pulley and single conveyor belt is adopted, completely abandoning the traditional multi-motor drive mode. Through the reverse winding design of the inner and outer rings of the conveyor belt, the first pulley and the second pulley form a natural reverse synchronous rotation relationship. This mechanical linkage structure does not require a complex electrical synchronization control system, eliminating the speed deviation and phase misalignment problems of multiple drive sources from the root. It ensures that the timing of the roller groove extruding the filter rod is highly consistent, and the consistency of external thread forming is significantly improved compared with traditional equipment, effectively solving quality defects such as "skipping lines" and "overlapping lines".

[0019] (2) Significant advantages of structural simplification and cost optimization: By integrating the transmission chain, the number of core drive components is greatly reduced, eliminating unnecessary components such as motors, reducers, and couplings. This not only reduces manufacturing costs but also simplifies assembly processes and shortens equipment assembly time. At the same time, the simplification of parts reduces potential failure points, lowers the frequency of later maintenance, significantly saves annual maintenance costs, and greatly improves the economic efficiency of the equipment.

[0020] (3) Adaptive adjustment capability of the tensioning system: The innovatively designed spring-type tensioning structure achieves dynamic balance of conveyor belt tension. When the conveyor belt becomes slightly loose due to long-term use, the spring automatically pushes the tensioning pulley to compensate for the displacement through the lever, maintaining stable transmission tension. The screw-type connecting rod design allows for flexible adjustment of the preset tension according to the conveyor belt material, load changes, and other working conditions, covering various tobacco production scenarios. This structure extends the service life of the conveyor belt and avoids transmission slippage or component overload damage caused by unstable tension.

[0021] (4) Dual improvement in space utilization and production flexibility: The slide rail layout and integrated design significantly reduce the equipment's footprint compared to traditional models, allowing it to be directly embedded in existing compact production lines without additional factory modifications. The second slide rail and plunger adjustment structure support stepless fine-tuning of the roller cutter groove position, enabling the replacement and adjustment of filter rods of different specifications to be completed in a short time, significantly shortening the replacement time compared to traditional equipment and meeting the flexible production needs of small batches and multiple varieties.

[0022] (5) Comprehensive improvement in energy consumption and operational stability: The single drive source design significantly reduces the no-load energy consumption of the equipment. Combined with the short path design of the transmission link, energy loss is significantly reduced compared to traditional multi-drive systems. In addition, the integrated transmission reduces mechanical vibration and noise, and the decibel level of the equipment is at a low level, providing a more friendly operating environment for production, while reducing the negative impact of vibration on the molding accuracy of filter rods. Attached Figure Description

[0023] The above description of this application and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solutions.

[0024] Figure 1 This is a structural diagram of the external curve tobacco filter rod forming device provided in this application;

[0025] Figure 2 This is a top view of the external curve tobacco filter rod forming apparatus provided in this application.

[0026] The reference numerals in the attached figures are explained as follows:

[0027] Slide rail: 10;

[0028] Slider: 11;

[0029] First pulley: 21;

[0030] Second pulley: 22;

[0031] First roller cutter groove: 31;

[0032] Second roller cutter groove: 32;

[0033] Conveyor belts: 4;

[0034] Drive mechanism: 41;

[0035] Frame size: 5;

[0036] Pin mounting hole: 51;

[0037] Linkage: 6;

[0038] lever: 7;

[0039] Tensioner pulley: 8;

[0040] Spring: 9. Detailed Implementation

[0041] The detailed features and advantages of this application are described below in the specific embodiments. The content of this description is sufficient to enable any person skilled in the art to understand the technical content of this application and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this application.

[0042] The invention will now be described with reference to the accompanying drawings, in which similar reference numerals denote similar elements. While specific structures and arrangements are discussed, it should be understood that this is done merely for illustrative purposes. Those skilled in the art will recognize that other structures and arrangements can be used without departing from the spirit and scope of the invention. It will be apparent to those skilled in the art that the invention can also be used in a variety of other applications.

[0043] In this specification and claims, several terms will be used, and unless otherwise indicated, these terms will be defined to have the following meanings:

[0044] The singular forms “a” and “the” include their corresponding plural forms. “At least one” means one or more, and “more” means two or more. “At least one of the following” or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be expressed as: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0045] All figures used to represent component amounts, properties (e.g., molecular weight), reaction conditions, etc., should be considered to be modified in all cases by the terms "within the unavoidable margin of error" or "about". Therefore, the numerical values ​​set forth herein are approximate and may vary depending on the desired properties sought to be obtained by the present invention. The principle of equivalents, which is applied to a minimum and not intended to limit the scope of the claims, should be applied, for example, each value should be interpreted at least according to the reported significant digits and by applying conventional rounding techniques.

[0046] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0047] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.

[0048] Unless otherwise indicated, the following abbreviations have the following meanings, and any other abbreviations used herein but not defined have their generally accepted standard meanings:

[0049] All other terms used herein for special definition are intended to have the general meaning understood by one of ordinary skill in the art, in particular meaning that one of ordinary skill in the art, upon reading the claims, specification and drawings of this patent, can directly and without doubt determine how the technical solution of this patent can be implemented.

[0050] Even if there are incomplete descriptions, omissions, or ambiguities in the grammar, words, punctuation, graphics, symbols, etc. of the claims, specification, and drawings of this patent, a person skilled in the art can still arrive at the only correct understanding by reading the claims, specification, and drawings as a whole without extensive reasoning or experimentation, and effectively exclude various incorrect interpretations that are not aimed at achieving the purpose of this patent.

[0051] Those skilled in the art would first choose to read the claims, specification, and drawings of this patent to reasonably interpret the terms; secondly, they would choose to refer to the relevant definitions in other documents published by the applicant before the filing date to reasonably interpret the terms; thirdly, they would choose the references cited in this patent to reasonably interpret the terms; and finally, they would choose to combine the technical dictionaries, technical manuals, reference books, textbooks, national or industry technical standards, etc., commonly used by those skilled in the art to reasonably interpret the terms.

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0053] Please refer to Figure 1 and Figure 2 This application provides an external curve tobacco filter rod forming device, which includes: a drive pulley, a first pulley 21, a second pulley 22, and a conveyor belt 4.

[0054] The inner ring of the conveyor belt 4 encloses the drive pulley and the first pulley 21.

[0055] The outer ring of the conveyor belt 4 surrounds the second pulley 22, which is adjacent to the first pulley 21. The rotation of the conveyor belt 4 causes the first pulley 21 and the second pulley 22 to rotate relative to each other.

[0056] A first cylinder is provided above the first pulley 21, and a second cylinder is provided above the second pulley 22.

[0057] The side of the first cylinder is provided with a corresponding first roller cutter groove 31, and the side of the second cylinder is provided with a corresponding second roller cutter groove 32.

[0058] The filter rod passes through the gap formed by the first roller cutter groove 31 and the second roller cutter groove 32, and is pressed to form an external thread corresponding to the texture of the first roller cutter groove 31 and the second roller cutter groove 32.

[0059] Specifically, the drive pulley is connected to the external drive mechanism 41 through the transmission shaft and can rotate at a constant speed around its own axis; the first pulley 21 and the second pulley 22 are arranged in parallel, and both of their axles are fixed to the frame 5 through bearing seats, and can rotate freely.

[0060] It is understood that the drive pulley is installed at the bottom of the frame 5 through the bearing seat. The bearing seat and the frame 5 are rigidly connected by bolts. The surface of the drive pulley is machined with an annular groove, and the groove is equipped with an anti-slip rubber pad. The pulley core is fixed to the drive shaft by a flat key. The other end of the drive shaft is connected to the output end of the servo motor through a coupling. The motor is fixed on the adjustable bracket on the side of the frame 5. The waist-shaped hole on the bracket can be used to fine adjust the position of the motor to ensure the coaxiality of the drive shaft and the motor output shaft.

[0061] The conveyor belt 4 is made of high-strength wear-resistant material. Its inner ring is tightly fitted on the outer circumference of the drive pulley and the outer circumference of the first pulley 21 to form a stable transmission contact. The outer ring of the conveyor belt 4 is fitted on the outer circumference of the second pulley 22, and the rim distance between the second pulley 22 and the first pulley 21 is small, ensuring that the conveyor belt 4 can drive the two pulleys simultaneously during operation.

[0062] When the drive pulley rotates under the action of external power, the conveyor belt 4 moves in a cycle along the preset track, thereby driving the first pulley 21 and the second pulley 22 to rotate relative to each other in opposite directions, forming a reverse synchronous transmission relationship.

[0063] It is understood that the first pulley 21 and the second pulley 22 are grooved pulleys of the same specification, and are arranged in the middle of the frame 5. The two ends of the pulley axle are connected to the bearing seats through bearings. The bearing seats are fixed on the second slider 11 and the third slider 11 respectively, ensuring that the pulleys can rotate flexibly and without axial movement. The conveyor belt 4 is made of wear-resistant polyurethane material, with evenly distributed toothed protrusions on the inner side, which mesh with the tooth grooves on the pulley surface. During assembly, the following steps should be followed: First, wrap the inner ring of the conveyor belt 4 around the drive pulley and the first pulley 21 to ensure that the inner ring is in close contact with the surfaces of the two pulleys; then, extend the outer ring of the conveyor belt 4 from the outside of the first pulley 21 and wrap it around the second pulley 22 in a reverse winding manner. During the winding process, it is necessary to ensure that the conveyor belt 4 is not twisted and that the contact area with each pulley is uniform.

[0064] Two cylinders are respectively positioned directly above the first pulley 21 and the second pulley 22, with the axes of the two cylinders collinear with the pulley axes. The outer circumferential surfaces of the two cylinders are respectively machined with matching first roller cutter grooves 31 and second roller cutter grooves 32. The grooves are distributed in a continuous spiral pattern, and parameters such as groove depth and pitch correspond perfectly. The openings of the first roller cutter groove 31 and the second roller cutter groove 32 are positioned opposite each other, forming a gap channel for only a single filter rod to pass through. When the filter rod passes through this gap axially under the action of the conveying mechanism, the two roller cutter grooves rotate synchronously in opposite directions under the drive of the lower pulley. The concave and convex structure of the grooves applies uniform extrusion force to the surface of the filter rod, pressing an external thread on the outer circumferential surface of the filter rod that perfectly matches the groove pattern.

[0065] The cylinder is fixed to the top of the pulley axle, and their axes coincide. The first roller cutter groove 31 and the second roller cutter groove 32 on the side of the cylinder are made by precision machining. The grooves are in a continuous spiral shape, the spiral directions of the two grooves are opposite and the textures match each other, and the edges of the groove openings are rounded to avoid scratching the filter rod.

[0066] The external curve tobacco filter rod forming device also includes: a tensioning structure.

[0067] The tensioning structure includes a tensioning pulley 8, a first slide rail 10, a first slider 11, and a spring assembly.

[0068] Among them, the tension pulley 8, the drive pulley and the first pulley 21 are enclosed in a triangle by the inner ring of the conveyor belt 4.

[0069] The first slide rail 10 is parallel to the axis connecting the first pulley 21 and the tension pulley 8. The tension pulley 8 is fixed on the first slider 11, and the first slider 11 slides back and forth on the first slide rail 10.

[0070] It is understood that the wheel body specifications of the tension pulley 8 are the same as those of the first pulley 21. The wheel axle is connected to the first slider 11 through a bearing. The first slider 11 is embedded in the groove of the first slide rail 10. The slide rail 10 is fixed to the frame 5 by bolts. Its length direction is parallel to the line connecting the wheel axles of the first pulley 21 and the tension pulley 8, ensuring that the tension pulley 8 can move in a preset direction.

[0071] The spring assembly includes a connecting rod 6, a spring, and a lever 7. The connecting rod 6 is fixed on the frame 5. One end of the connecting rod 6 is provided with a stop block. One end of the lever 7 is sleeved on the connecting rod 6, and the other end of the lever 7 is connected to the first slider 11. The spring 9 is sleeved on the connecting rod 6 and is located between the lever 7 and the stop block.

[0072] The drive pulley is fixed to one side of the frame 5 via a bearing housing. The first pulley 21 and the second pulley 22 are arranged side by side in the middle of the frame 5 and can rotate freely around the rotation axis. The tension pulley 8 is located on the side near the drive pulley, forming a triangular distribution with the first pulley 21 and the second pulley 22. The conveyor belt 4 is made of polyurethane and passes around the first pulley 21 and the second pulley 22 in sequence to form an S-shaped structure. Its two ends are respectively fitted onto the drive pulley and the tension pulley 8 to achieve power transmission.

[0073] In the spring assembly, one end of the connecting rod 6 is fixed to the frame 5, and the other end is provided with a stop block. One end of the lever 7 is sleeved on the connecting rod 6, and the other end is connected to the first slider 11. The spring 9 is sleeved on the connecting rod 6 and located between the lever 7 and the stop block. During assembly, the spring 9 needs to be in a proper compressed state to ensure the initial tension of the conveyor belt 4.

[0074] Specifically, the diameter of the tension pulley 8 is matched with that of the first pulley 21, and its axle is connected to the first slider 11 through a bearing; the outer circumferences of the tension pulley 8, the drive pulley and the first pulley 21 are wrapped in a triangle by the inner ring of the conveyor belt 4, forming a stable three-point transmission structure.

[0075] The first slide rail 10 is fixed to the frame 5 by bolts. Its length direction is parallel to the line connecting the axles of the first pulley 21 and the tension pulley 8. The first slider 11 is embedded in the groove of the first slide rail 10 and can slide freely along the length direction of the slide rail 10 to ensure that the tension pulley 8 can be adjusted in a preset direction.

[0076] The spring assembly includes a connecting rod 6, a spring 9, and a lever 7. The connecting rod 6 is a rigid rod with one end vertically fixed to the side wall of the frame 5 and the other end welded with a circular stop.

[0077] One end of the lever 7 has a through hole and is movably sleeved on the body of the connecting rod 6, while the other end is connected to the first slider 11; the spring 9 is a high-strength compression spring, which is sleeved on the connecting rod 6 and its two ends abut against the side of the lever 7 and the side of the stop block, respectively.

[0078] Under the natural elastic force of the spring 9, the lever 7 is always pushed towards the tension pulley 8, and through its connection with the first slider 11, it drives the tension pulley 8 to move away from the first pulley 21, so that the conveyor belt 4 is always kept in a moderate tension state and slippage is avoided during transmission.

[0079] The external curve cigarette filter rod forming device also includes: a second slide rail 10, a second slider 11 and a third slider 11. The second slide rail 10 is arranged perpendicularly to the first slide rail 10. The first pulley 21 and the second pulley 22 are respectively arranged on the second slider 11 and the third slider 11. The second slider 11 and the third slider 11 slide on the second slide rail 10.

[0080] Specifically, the second slide rail 10, the second slider 11, and the third slider 11 are used to adjust the pulley spacing. The second slide rail 10 is fixed to the frame 5 by bolts, and its length direction is perpendicular to the first slide rail 10. The second slider 11 and the third slider 11 are simultaneously embedded in the slide groove of the second slide rail 10, and the two can slide independently along the length direction of the slide rail 10.

[0081] The second slide rail 10 is fixed to the middle of the frame 5 by bolts and is arranged perpendicular to the first slide rail 10. The bottom of the second slide rail 11 and the third slide rail 11 are provided with wear-resistant slide rails 11, which can slide flexibly along the slide groove of the second slide rail 10. The bearing seats of the first pulley 21 and the second pulley 22 are respectively fixed to the second slide rail 11 and the third slide rail 11 by bolts. The side of the second slide rail 10 is provided with a pin mounting hole 51, through which the pin can be passed to fix the position of the slide rail 11.

[0082] The bearing seat of the first pulley 21 is fixed to the upper surface of the second slider 11 by bolts, and the bearing seat of the second pulley 22 is fixed to the upper surface of the third slider 11 by bolts, so that the two pulleys can move synchronously with the slider 11, thereby adjusting the relative distance between them.

[0083] The external curve tobacco filter rod forming device also includes a pin that passes through the slide rail 10 and is used to limit the second slider 11 and the third slider 11.

[0084] It is understood that multiple pin mounting holes 51 are evenly provided along the length direction on the side wall of the second slide rail 10. The pins can pass through the pin mounting holes 51 and block the side of the second slider 11 or the third slider 11, which can limit the sliding stroke of the slider 11 and achieve precise positioning of the pulley.

[0085] The connecting rod 6 is a screw rod, which is threaded to the frame 5, and the preset tension of the tension pulley 8 can be adjusted by rotating the connecting rod 6.

[0086] Specifically, the connecting rod 6 adopts a screw structure, with external threads machined on its body. The corresponding position of the frame 5 is provided with an installation hole with internal threads. The connecting rod 6 is screwed vertically into the frame 5 through thread engagement and thus fixed.

[0087] When it is necessary to adjust the preset tension, the operator can use a wrench to rotate the connecting rod 6, so that the connecting rod 6 moves axially in and out of the frame 5, thereby changing the initial compression of the spring 9. The deeper the connecting rod 6 is screwed into the frame 5, the greater the compression of the spring 9, the stronger the thrust on the lever 7, and the greater the pre-tension force of the tension pulley 8 on the conveyor belt 4. Conversely, the pre-tension force decreases, thus adapting to the transmission requirements under different working conditions.

[0088] The external curve cigarette filter rod forming device is configured to adjust the external curve cigarette filter rod forming device according to the following steps:

[0089] Step S1: Rotate the connecting rod 6 so that the lever 7 drives the first slider 11 to slide on the first slide rail 10, thereby adjusting the tension of the tension pulley 8 on the conveyor belt 4.

[0090] Specifically, when the conveyor belt 4 becomes slack or too tight, the operator uses a tool to rotate the connecting rod 6, which acts as a screw. Since the connecting rod 6 is connected to the frame 5 by a thread, its rotation is converted into a linear displacement along the axial direction, thereby changing the compression degree of the spring 9. The force exerted by the spring 9 on the lever 7 changes with the amount of compression. Under the action of the force, the lever 7 drives the first slider 11 to slide along the first slide rail 10, causing the tensioning pulley 8 to move closer to or further away from the first pulley 21, thereby adjusting the tension of the conveyor belt 4 until the conveyor belt 4 can drive smoothly without obvious slippage or abnormal noise.

[0091] Step S2: The plunger is installed on the second slide rail 10. The pin is inserted into the plunger to restrict its movement, thereby adjusting the distance between the second pulley 22 and the end of the second slide rail 10, and adjusting the longitudinal position of the first roller cutter groove 31.

[0092] Specifically, when it is necessary to adjust the alignment between the roller cutter groove gap and the conveying path according to the actual position of the filter rod conveying path, first pull out the pin inserted into the pin mounting hole 51 and remove the plunger of the current specification.

[0093] Select plungers of different thicknesses or lengths and embed them into the preset grooves of the second slide rail 10, so that one end of the plunger abuts against the side of the second slider 11.

[0094] Next, the pin is passed through the pin mounting hole 51 on the side wall of the second slide rail 10 and inserted into the positioning groove of the plunger to restrict the relative movement between the plunger and the second slider 11. By replacing the plunger with different specifications, the limit position of the second slider 11 on the second slide rail 10 can be changed, thereby adjusting the distance between the second pulley 22 and the end of the second slide rail 10, and finally achieving fine adjustment of the position of the first roller cutter groove 31 in the longitudinal direction to ensure that the filter rod can accurately enter the gap of the roller cutter groove.

[0095] The debugging and operation of the device shall be carried out in accordance with the following steps:

[0096] Transmission system debugging: Start the servo motor and observe the rotation of the drive pulley, the first pulley 21, and the second pulley 22 to ensure that the conveyor belt 4 runs smoothly without deviation, slippage, or abnormal noise. If uneven transmission occurs, it can be corrected by adjusting the motor position or the fixing bolts of the pulley bearing housing.

[0097] Roller groove alignment adjustment: Manually place the standard filter rod sample into the gap formed by the first roller groove 31 and the second roller groove 32, rotate the pulley to make the filter rod rotate with the roller groove, and take out the filter rod to observe the external thread forming effect.

[0098] Tension adjustment: When the conveyor belt 4 shows signs of loosening, rotate the connecting rod 6 to adjust the compression of the spring 9, so that the tension pulley 8 increases the tension of the conveyor belt 4; if the conveyor belt 4 is too tight, the connecting rod 6 can be rotated in the opposite direction to reduce the tension until the conveyor belt 4 runs smoothly.

[0099] Changeover Operation: When it is necessary to change to a different specification of filter rod, first pull out the pin, remove the current plunger, and push the second slider 11 and the third slider 11 to adjust the position of the first pulley 21 and the second pulley 22 so that the gap of the roller cutter groove is adapted to the new specification filter rod. Select a suitable plunger and install it in the corresponding position, insert the pin to fix the slider 11, and after trial production, confirm that the external thread of the filter rod is qualified, formal production can begin.

[0100] In this specification, references to "an embodiment" or "a specific implementation" mean that a particular feature, structure, or characteristic described in connection with that embodiment / specific implementation is included in at least one embodiment / specific implementation of the invention. Therefore, the phrase "in one embodiment / specific implementation" appearing in various places in this specification does not necessarily refer to the same embodiment / setting, but rather to potentially different embodiments. Furthermore, specific features, structures, or characteristics may be combined in one or more embodiments / settings in any suitable manner, as will be apparent to those skilled in the art from this disclosure.

[0101] Similarly, it should be understood that in the above description of exemplary embodiments / specific implementations of the invention, various features of the invention are sometimes combined in a single embodiment / specific implementation or its figures and description, with the aim of simplifying the disclosure and aiding in the understanding of one or more of the various aspects of the invention. However, the method of description in this patent should not be construed as reflecting an intention that the claimed features of the invention are more than those expressly stated in each claim, except where explicitly stated otherwise or in obvious technical contradiction or exclusion. Rather, the inventive aspect reflected in the claims lies in not all the features of a single foregoing disclosed embodiment / specific implementation. Therefore, the claims following the detailed description are expressly incorporated herein by reference, each claim existing independently as a separate embodiment / specific implementation of the invention.

[0102] Furthermore, while some embodiments / specific implementations described herein include, but are not limited to, other features included in other embodiments / specific implementations, combinations of features from different embodiments / specific implementations are intended to be within the scope of the invention and form different embodiments / specific implementations, as will be understood by those skilled in the art. For example, in the following claims, embodiments / specific implementations of any claim can be used in any combination.

[0103] The terms and expressions used in this specification are for illustrative purposes and not for limitation. In using these terms and expressions, it is not intended to exclude any equivalents of the features or portions thereof shown and described, but rather to recognize that various modifications may be possible within the scope of the invention.

[0104] Therefore, it should be understood that although the invention has been specifically disclosed through preferred embodiments, exemplary embodiments and optional features, those skilled in the art may take variations or modifications of the concepts disclosed herein, and such variations and modifications are therefore considered to be within the scope of the invention as defined by the appended claims.

[0105] The specific embodiments given in this specification are examples of useful implementations of the present invention. It will be apparent to those skilled in the art that the present invention can be implemented using many variations of the devices, device components, and method steps disclosed in this specification.

[0106] The foregoing description of specific embodiments fully discloses the general features of the present invention, enabling others to easily modify and / or adapt such specific embodiments for various applications by applying knowledge within the scope of the art, without conducting excessive experimentation and without departing from the general concept of the present invention.

[0107] Therefore, based on the teachings and guidance provided herein, it is intended that such modifications and alterations be included within the meaning and scope of equivalents of the disclosed embodiments. It should be understood that the wording or terminology used herein is for descriptive purposes and is not intended to be limiting; thus, the wording or terminology in this specification will be interpreted by those skilled in the art based on the foregoing teachings and guidance.

[0108] Furthermore, the scope of the invention should not be limited to any of the exemplary embodiments described above, but only to the appended claims and their equivalents.

Claims

1. A device for forming an outer-curved filter rod for cigarettes, characterized in that, The externally curved cigarette filter rod forming device includes: a drive pulley, a first pulley, a second pulley, and a conveyor belt. The inner ring of the conveyor belt encloses the drive pulley and the first pulley; The outer ring of the conveyor belt surrounds the second pulley, and the second pulley is adjacent to the first pulley. The rotation of the conveyor belt causes the first pulley and the second pulley to rotate relative to each other. A first cylinder is provided above the first pulley, and a second cylinder is provided above the second pulley. The side of the first cylinder is provided with a corresponding first roller cutter groove, and the side of the second cylinder is provided with a corresponding second roller cutter groove. The filter rod passes through the gap formed by the first and second roller cutter grooves and is pressed to form external threads corresponding to the patterns of the first and second roller cutter grooves.

2. The externally curved cigarette filter rod forming device according to claim 1, characterized in that, The external curve tobacco filter rod forming device also includes: a tensioning structure. The tensioning structure includes a tensioning pulley, a first slide rail, a first slider, and a spring assembly. The tension pulley, the drive pulley, and the first pulley are enclosed in a triangle by the inner ring of the conveyor belt; The first slide rail is parallel to the axis connecting the first pulley and the tension pulley. The tension pulley is fixed on the first slider, and the first slider slides back and forth on the first slide rail. The spring assembly includes a connecting rod, a spring, and a lever. The connecting rod is fixed to the frame, and one end of the connecting rod is provided with a stop. One end of the lever is sleeved on the connecting rod, and the other end of the lever is connected to the first slider. The spring is sleeved on the connecting rod and located between the lever and the stop.

3. The externally curved cigarette filter rod forming device according to claim 2, characterized in that, The conveyor belt, in an S-shape, passes sequentially around the first pulley and the second pulley, and then its two ends are respectively fitted with the drive pulley and the tension pulley, forming a closed transmission path.

4. The external curve tobacco filter rod forming device according to claim 2, characterized in that, The external curve tobacco filter rod forming device further includes: a second slide rail, a second slider, and a third slider. The second slide rail is perpendicular to the first slide rail. The first pulley and the second pulley are respectively mounted on the second slider and the third slider. Both the second slider and the third slider slide on the second slide rail.

5. The externally curved cigarette filter rod forming device according to claim 4, characterized in that, The external curve tobacco filter rod forming device also includes a pin. The pin passes through the slide rail and is used to limit the movement of the second slider and the third slider.

6. The externally curved cigarette filter rod forming device according to claim 2, characterized in that, The connecting rod is a screw rod, which is threaded to the frame body, and the preset tension of the tensioning pulley can be adjusted by rotating the connecting rod.

7. The external curve tobacco filter rod forming device according to claim 4, characterized in that, The external curve tobacco filter rod forming device is configured to adjust the external curve tobacco filter rod forming device according to the following steps: Step S1: Rotate the connecting rod so that the lever drives the first slider to slide on the first slide rail, thereby adjusting the tension of the tensioning pulley on the conveyor belt; Step S2: The plunger is installed on the second slide rail, and the pin is inserted into the plunger to restrict the movement of the plunger, thereby adjusting the distance between the second pulley and the end of the second slide rail, and realizing the adjustment of the longitudinal position of the first roller cutter groove.

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