Flexible swing rod assembly

Abstract

According to the flexible swing rod assembly, one end of a first elastic assembly and one end of a second elastic assembly are hinged to the side edge of a rotating sleeve, the other end of the first elastic assembly and the other end of the second elastic assembly are hinged to an equipment base plate through pin shafts, the upper end of a swing rod is fixed to the rotating sleeve, and the lower portion of the swing rod is fixed to a material containing roller assembly. Compared with the prior art, the elastic component and the spring are combined, material tension fluctuation is effectively absorbed, material damage caused by rigid impact is avoided, the force balance of the flexible swing rod component is set within + / -0.2 g through the elastic component, the problem of uneven material tension is partially solved through the flexible swing rod component, the produced product is attractive in appearance, and the product quality is improved. The device is not only limited to filter stick production, but also can be extended to bag making and bag making processes of a vertical packaging machine, a horizontal packaging machine and the like, and the tension is uniform and is within 2% of that of a small-interval swing rod assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of constant tension production and processing of materials, and more particularly to a flexible rocker assembly. Background Art

[0002] In the cigarette production process, tow, a critical raw material, undergoes multiple processing steps. The stability of its tension and the accuracy of its path during transportation directly impact cigarette quality. Conventional swing arm assemblies, often with rigid structures, struggle to adapt to dynamic changes in tow tension, easily leading to tow breakage or wrinkling. Furthermore, existing devices lack an efficient angle feedback mechanism, making it impossible to precisely control the swing arm's swing amplitude, which in turn affects the stability of tow transportation.

[0003] The bag-making process of packaging equipment is prone to edge warping and pattern misalignment due to the tension fluctuation of material output.

[0004] Therefore, it is necessary to propose a flexible rocker assembly to address the above technical problems. Summary of the Invention

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a flexible rocker arm assembly, which, through the combination of an elastic buffer structure and a precise transmission mechanism, can achieve adaptive tension adjustment and precise control of the swing angle during material conveying, thereby improving product production stability and product quality.

[0006] A flexible rocker assembly includes a first elastic component, a second elastic component, a rocker and a material-capacity roller assembly, wherein one end of the first elastic component and the second elastic component are hinged to the side of a rotating sleeve, and the other ends of the first elastic component and the second elastic component are hinged to the equipment base plate through a pin shaft, the upper end of the rocker is fixed to the rotating sleeve, and the lower part of the rocker is fixed to the material-capacity roller assembly.

[0007] Preferably, the device substrate is provided with a protective cover on the encoder.

[0008] Preferably, the first elastic component includes a first telescopic sleeve, a first telescopic rod and a first slider, and the first telescopic rod is slidably connected in the first telescopic sleeve via the first slider.

[0009] Preferably, the first telescopic rod is sleeved with a first spring and a second spring.

[0010] Preferably, the second elastic component includes a second telescopic sleeve, a second telescopic rod and a second slider, and the second telescopic rod is slidably connected in the second telescopic sleeve via the first slider.

[0011] Preferably, the first telescopic rod is sleeved with a third spring and a fourth spring.

[0012] Preferably, the rocker arm is provided with a plurality of slots.

[0013] Preferably, the material capacity roller assembly includes a first material capacity roller and a second material capacity roller, the first material capacity roller and the second material capacity roller have the same structure, the first material capacity roller includes a rotating roller and a fixed rod, one end of the fixed rod is fixed to the rocker arm, and the rotating roller is fitted outside the fixed rod.

[0014] Compared with the existing technology, it has the following beneficial effects: 1. The present invention effectively absorbs material tension fluctuations and avoids material damage caused by rigid impact through the spring combination of the first elastic component and the second elastic component. 2. The slot design of the swing arm reduces the weight of the swing arm. The roller structure of the material roller assembly reduces the material conveying resistance and improves the operating efficiency of the equipment. A protective cover is set on the encoder of the equipment substrate to effectively isolate dust and oil, thereby extending the service life of the sensor.

[0015] The flexible rocker assembly, through its primary and secondary elastic components and the elastic rocker assembly, can maintain force balance within ±0.2 grams-force. Tension fluctuations due to friction and various practical factors can be within ±2 grams-force. The flexible rocker assembly partially addresses uneven material tension, significantly improving the appearance and quality of the resulting product.

[0016] The present invention is not limited to filter rod production, but can also be extended to bag making and bag making processes of vertical packaging machines, horizontal packaging machines, etc. The tension is uniform and is within 2% of the pure small-interval rocker assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the structure of the invention; Figure 2 and Figure 3 It is a structural diagram of components on the device substrate of the present invention; Figure 4 1. It is a structural diagram of the connection between the first elastic component, the second elastic component and the rocker arm of the present invention; Figure 5 is a schematic diagram of a first elastic component of the present invention; Figure 6 is a structural diagram of a second elastic component of the present invention; Figure 7 It is a structural diagram of the first material-capacity roller of the present invention.

[0018] The reference numerals in the figure are: 1. first elastic component; 2. second elastic component; 3. servo motor; 4. rocker arm; 5. material collection roller assembly; 6. equipment base plate; 7. rotating sleeve; 8. first pulley; 9. toothed belt; 10. second pulley; 11. encoder; 12. protective cover; 101. first telescopic sleeve; 102. first telescopic rod; 103. first slider; 104. first spring; 105. second spring; 201. second telescopic sleeve; 202. second telescopic rod; 203. second slider; 204. third spring; 205. fourth spring; 206. slot; 501. first material collection roller; 502. second material collection roller; 503. rotating roller; 504. fixing rod. 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 with reference to the accompanying drawings and embodiments. 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 terms "first" and "second" in the specification and claims of the present invention are used to distinguish different objects, rather than to describe a specific order of objects. For example, "first control instruction" and "second control instruction" are used to distinguish different control instructions, rather than to describe a specific order of control instructions.

[0021] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0022] In the description of the embodiments of the present invention, unless otherwise specified, “multiple” means two or more than two. For example, multiple processing units means two or more processing units, etc.; multiple elements means two or more elements, etc.

[0023] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0024] like Figure 1 Combined with Figures 2 to 7As shown, a flexible rocker assembly includes a first elastic component 1, a second elastic component 2, a servo motor 3, a rocker 4 and a material-capacity roller assembly 5. The servo motor 3 is installed on a device substrate 6, and a rotating sleeve 7 is fixed to one output end of the servo motor 3. One end of the first elastic component 1 and the second elastic component 2 are hinged to the side of the rotating sleeve 7, and the other ends of the first elastic component 1 and the second elastic component 2 are hinged to the device substrate 6 through a pin shaft. The upper end of the rocker 4 is fixed to the rotating sleeve 7, and the lower part of the rocker 4 is fixed to the material-capacity roller assembly 5.

[0025] The other output end of the servo motor 3 is connected to a first pulley 8, which is in turn connected to a second pulley 10 via a toothed belt 9. The central axis of the second pulley 10 is connected to an encoder 11, which is mounted on the equipment baseboard 6. Encoder 11 monitors the rotation angle of the servo motor 3 in real time and, through the toothed belt 9, provides precise feedback on the swing angle of the rocker arm 4, forming a closed-loop control system to ensure accurate positioning of the tow conveyor path. The control system adjusts the speed and direction of the servo motor 3 in real time based on the signals from encoder 11, adapting to the swing amplitude requirements of the rocker arm 4 in different production processes and enhancing the equipment's flexibility.

[0026] A protective cover 12 is installed over the encoder 11 on the equipment base plate 6. This effectively isolates impurities such as dust, oil, and moisture from the production environment, preventing signal distortion or mechanical failure of the encoder 11 due to contamination. This extends its service life and ensures the long-term reliability of the angle feedback system. This cover is suitable for dusty cigarette production environments and improves the stability of the equipment under complex operating conditions.

[0027] The first elastic assembly 1 comprises a first telescopic sleeve 101, a first telescopic rod 102, and a first slider 103. The first telescopic rod 102 is slidably connected to the first telescopic sleeve 101 via the first slider 103. The combination of the slider and the sleeve allows the telescopic rod to slide axially. When the tow tension changes, the elastic assembly absorbs or releases energy through expansion and contraction, achieving dynamic buffering and reducing the rigid displacement of the rocker arm 4. The slider structure limits radial movement of the telescopic rod, ensuring that the elastic assembly maintains linear motion during expansion and contraction, enhancing the smoothness of the buffering process.

[0028] The first telescopic rod 102 is equipped with a first spring 104 and a second spring 105. By arranging two springs (such as compression springs or tension springs) on the telescopic rod, a multi-stage elastic buffer structure is formed to accommodate tension fluctuations of varying magnitudes. The spring preload is adjustable to meet the tension requirements of different tow sizes. When tow tension increases, the spring compresses to absorb energy; when tension decreases, the spring returns to provide pulling force, preventing excessive swing of the pendulum rod 4 due to tension imbalance, thus achieving bidirectional adaptive tension adjustment.

[0029] The second elastic assembly 2 comprises a second telescopic sleeve 201, a second telescopic rod 202, and a second slider 203. The second telescopic rod 202 is slidably connected to the second telescopic sleeve 201 via the second slider 203. The second elastic assembly 2 is symmetrically arranged with the first elastic assembly 1. The identical slider-telescopic sleeve structure ensures balanced force on both sides of the rotating sleeve 7, preventing deflection or jamming of the swing arm 4 due to unilateral force, thereby improving system stability. The dual elastic assemblies work together to expand the tension buffering range. Even if a minor fault occurs on one side, the other side can still provide basic buffering capacity, improving the device's fault tolerance.

[0030] The second telescopic rod 202 is equipped with a third spring 204 and a fourth spring 205. By adding the third and fourth springs to the second telescopic rod 202 (complementing the dual springs of the first elastic component 1), a four-spring buffer system is constructed, further enhancing the elastic component's tension absorption capacity. This is particularly suitable for high-frequency tension fluctuations in high-speed production.

[0031] The pendulum rod 4 is provided with a plurality of slots 206. The slots 206 reduce the weight of the pendulum rod 4, reduce the driving load of the servo motor 3, and reduce energy consumption; at the same time, the center of gravity distribution of the pendulum rod 4 is optimized, and the balance of the swing process is improved.

[0032] The feed roller assembly 5 includes a first feed roller 501 and a second feed roller 502. The first and second feed rollers 501 and 502 have identical structures. The first feed roller 501 includes a rotating roller 503 and a fixed rod 504. One end of the fixed rod 504 is fixed to the swing rod 4, and the rotating roller 503 is mounted on the fixed rod 504. The rotating roller 503 is mounted on the fixed rod 504 via a bearing, allowing for free rotation. This reduces sliding friction between the tow and the feed roller, prevents surface damage or static electricity accumulation, and ensures tow quality. The tow forms an S-shaped path around the two rollers 503. The swing rod 4 swings to adjust the angle between the two rollers 503, achieving smooth changes in the tow's conveying direction and avoiding sudden changes in tension caused by sharp bends.

[0033] Beneficial effect: The present invention effectively absorbs the tension fluctuation of the yarn bundle through the spring combination of the first elastic component 1 and the second elastic component 2, and avoids the damage of the yarn bundle caused by rigid impact. The servo motor 3 drives and cooperates with the encoder 11 for real-time monitoring to achieve precise control of the swing angle of the rocker arm 4 to meet the requirements of different production processes.

[0034] The slot hole 206 design of the rocker arm 4 reduces the weight of the rocker arm 4, and the roller 503 structure of the material roller assembly 5 reduces the resistance to tow conveying, thereby improving the operating efficiency of the equipment; the protective cover 12 set on the encoder 11 of the equipment substrate 6 effectively isolates dust and oil, thereby extending the service life of the sensor.

[0035] The flexible rocker assembly can set the force balance within ±0.2 grams through the primary elastic assembly, the secondary elastic assembly and the elastic rocker assembly. Due to practical reasons such as friction, the fluctuation is within ±2 grams. The flexible rocker assembly partially solves the uneven elastic bending tension of the filament bundle, and the suction resistance fluctuation of the produced filter rod is improved by more than 10% compared with the current nozzle rod index.

[0036] The invention is not limited to filter rod production, but can also be extended to bag making and vertical packaging machines, horizontal packaging machines, and other bag making processes. The tension is uniform and is within 2% of the pure small-interval swing arm assembly. Working process: the control system sends instructions, the servo motor 3 drives the rotating sleeve 7 to swing clockwise, the rocker arm 4 synchronously drives the material-containing roller assembly 5 to deflect, and the tow conveying path is adjusted to one side; the encoder 11 monitors the angle of the rotating sleeve 7 in real time through the toothed belt 9, and sends a signal to the servo motor 3 to stop the action when it reaches the preset value; when the tow tension changes, the spring of the elastic component absorbs energy through compression / stretching to prevent the rocker arm 4 from shaking violently; when reverse adjustment is required, the servo motor 3 rotates counterclockwise, and the rocker arm 4 swings in the opposite direction under the action of the reset force of the elastic component on the opposite side, completing the dynamic adjustment of the tow conveying path.

[0037] Example 1: Conventional cigarette tow delivery scenario It is suitable for medium-speed cigarette production lines (conveyance speed 500-1000m / min), processing conventional acetate fiber tow (single yarn denier 1.5-3.0D), requiring the tow tension to be stable at 50±2gf, and the filter rod draw resistance fluctuation ≤15%.

[0038] Servo motor 3: A low-inertia servo motor (model: Mitsubishi HG-KR43J) with a rated speed of 3000 rpm and an output torque of 4.0 N m is selected.

[0039] First elastic component 1: The first telescopic sleeve 101 has a length of 150 mm, the effective stroke of the first telescopic rod 102 is ±20 mm, the first spring 104 (stiffness 10 N / mm) and the second spring 105 (stiffness 15 N / mm) are connected in series, and the preload force is 30 grams.

[0040] The second elastic component 2 has a symmetrical structure. The stiffness of the third spring 204 and the fourth spring 205 are 12 N / mm and 13 N / mm respectively.

[0041] The material collection roller assembly 5: The roller 503 of the first material collection roller 501 and the second material collection roller 502 has a diameter of 80 mm and a surface coated with a polytetrafluoroethylene friction reduction layer. The fixed rod 504 is installed through the middle slot 206 of the rocker 4 with a spacing of 150 mm.

[0042] Operating Process: With pendulum arm 4 in a vertical neutral position, the tow wraps around two rollers 503 at a 180° wrap angle, with an initial tension of 50 grams-f. If upstream equipment speed fluctuations cause tow accumulation, servo motor 3 drives the sleeve 7 to swing 10° clockwise, causing pendulum arm 4 to deflect the material-receiving roller assembly 5 to the right, releasing the accumulated tow. If the tow tension suddenly increases to 55 grams-f, the first telescopic rod 102 of the first elastic assembly 1 slides 5mm to the left, compressing the first spring 104 and stretching the second spring 105 to absorb the energy. Simultaneously, the second elastic assembly 2 stretches in the opposite direction, balancing the force on pendulum arm 4 via the third and fourth springs 204 and 205, ensuring tension fluctuations within ±2 grams-f. Encoder 11 provides real-time feedback on the sleeve 7 angle (with an accuracy of ±0.1°), and servo motor 3 stops when the angle reaches 10°.

[0043] Implementation effect: The tow tension fluctuation is controlled within 48-52 grams-force (±2 grams-force), which is 75% higher than the traditional rigid rocker assembly.

[0044] The fluctuation of filter rod draw resistance is reduced from 18% to 12%, meeting the quality requirements of high-end cigarettes.

[0045] Example 2: High-speed cigarette tow tension compensation scenario It is suitable for high-speed cigarette production lines (conveyance speed 1500-2000m / min), processing high-elasticity polypropylene tow (single yarn denier 1.0-1.5D), and coping with high-frequency tension fluctuations (frequency ≥ 50Hz). It requires the swing frequency of the pendulum 4 to be 30 times / second.

[0046] Servo motor 3: A high-speed response servo motor (model: Siemens1FK7042-5AK71-1AA0) with a maximum speed of 6000 rpm and a 20-bit absolute encoder (resolution 0.0056°) is selected.

[0047] Elastic component optimization: Both the first and second elastic components adopt a "double spring parallel" structure, with the first spring 104 and the second spring 105 connected in parallel (total stiffness 25 N / mm), and the third spring 204 and the fourth spring 205 connected in parallel (total stiffness 28 N / mm); the slider adopts a linear bearing, and the friction coefficient is reduced from 0.2 to 0.05.

[0048] Rocker 4 and material-carrying roller assembly 5: Rocker 4 adopts a lightweight aluminum alloy design, with slots 206 distributed at a density of 5 per 100 mm, reducing weight by 30%; the diameter of roller 503 is reduced to 60 mm, the moment of inertia is reduced by 40%, and the response speed is increased to 20 ms / °.

[0049] Working process: When the production line speed is increased to 1800m / min, the servo motor 3 drives the rotating sleeve 7 to swing back and forth ±15° at a frequency of 20 times / second, and drives the encoder 11 to provide real-time feedback through the toothed belt 9 to ensure that the swing cycle matches the tow conveying speed.

[0050] When the tow generates high-frequency tension fluctuations (such as 50Hz, ±10 grams of force), the parallel spring group of the elastic component is quickly compressed / stretched (response time ≤ 10ms), attenuating the fluctuations to within ±2 grams of force; the symmetrical elastic component balances the loads on both sides of the rotating sleeve 7 to avoid resonance.

[0051] The linear bearing design of roller 503 reduces the friction resistance of the tow from 5 grams of force to 1 gram of force, and combined with the S-shaped roller winding path (270° wrap angle), it reduces tow damage.

[0052] Implementation effect: The swing angle error of pendulum 4 is ≤0.5°, meeting the requirement of precise adjustment 30 times per second.

[0053] For 1.0D tow, the tension fluctuation is controlled at ±1.5 grams, and the filter rod suction resistance fluctuation is reduced from 20% to 8%, exceeding the user's required 10% improvement target.

[0054] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flexible rocker assembly, characterized in that: It includes a first elastic component, a second elastic component, a rocker arm and a material-capacity roller component. One end of the first elastic component and the second elastic component are hinged to the side of the rotating sleeve, and the other ends of the first elastic component and the second elastic component are hinged to the equipment base plate through a pin shaft. The upper end of the rocker arm is fixed to the rotating sleeve, and the lower part of the rocker arm is fixed to the material-capacity roller assembly.

2. A flexible rocker assembly according to claim 1, characterized in that: The other output end of the servo motor is connected to a first pulley, the first pulley is connected to a second pulley through a toothed belt transmission, the central axis of the second pulley is connected to an encoder, and the encoder is installed on a device substrate.

3. The flexible rocker assembly according to claim 1, wherein: The device substrate is provided with a protective cover on the encoder.

4. The flexible rocker assembly according to claim 1, wherein: The first elastic component includes a first telescopic sleeve, a first telescopic rod and a first slider, and the first telescopic rod is slidably connected in the first telescopic sleeve via the first slider.

5. The flexible rocker assembly according to claim 1, wherein: The first telescopic rod is sleeved with a first spring and a second spring.

6. The flexible rocker assembly according to claim 1, wherein: The second elastic component includes a second telescopic sleeve, a second telescopic rod and a second slider, and the second telescopic rod is slidably connected to the second telescopic sleeve through the first slider.

7. The flexible rocker assembly according to claim 1, wherein: The first telescopic rod is sleeved with a third spring and a fourth spring.

8. The flexible rocker assembly according to claim 1, wherein: The rocker is provided with a plurality of slots.

9. The flexible rocker assembly according to claim 1, wherein: The material capacity roller assembly includes a first material capacity roller and a second material capacity roller. The first material capacity roller and the second material capacity roller have the same structure. The first material capacity roller includes a rotating roller and a fixed rod. One end of the fixed rod is fixed to the rocker arm, and the rotating roller is sleeved outside the fixed rod.

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