Tobacco tow pre-opening tension stabilizing device

Abstract

The invention provides a pre-opening tension stabilizing device for tobacco tows, and belongs to the technical field of tobacco machinery. The device is installed between a tow feeding bag and a filter stick forming device and comprises a lifting module device and a body fixed to an extension arm of the lifting module device. The body comprises a mounting plate, and a pre-first-stage opening device, a tow extracting motor roller device, a tow pressing roller device, a tension feedback belt guide device and a pre-second-stage opening device which are arranged in sequence. The tows are gently opened through two stages of opening devices which are uniquely designed, and internal stress is eliminated; the tension feedback belt guiding device detects the tension of the tows in real time through a swing arm mechanism, converts the tension into electric signals and feeds the electric signals back to a control system, the extraction speed is dynamically adjusted through a PID algorithm, and closed-loop constant tension control is formed. The problem of tension fluctuation caused by height change of the tow package is effectively solved, the stability and consistency of filter stick quality are remarkably improved, and the rejection rate and raw material consumption are reduced.

Description

Technical Field

[0001] This invention belongs to the field of tobacco machinery technology, and specifically relates to a tow pre-opening tension stabilization device for a filter rod forming machine. Background Technology

[0002] KDF2 / 3 / 4 series filter rod forming machines are widely used in the tobacco industry and are key equipment for producing cigarette filter rods. For a long time, unstable tow tension during filter rod production has been one of the main factors affecting filter rod quality (such as shrinkage and draw resistance fluctuations). This is mainly because during the extraction process, as the height of the tow layer decreases, changes in the tow's own weight and the packing pressure cause changes in the tow belt tension, leading to instability in filter rod quality during subsequent forming processes.

[0003] While some technical modifications have been made to KDF equipment in the existing technology, the problem of tension fluctuation caused by changes in the height of the filament bundle has not been fundamentally solved. Unstable tension directly leads to uneven circumference of the filter rods, excessive suction resistance, increased scrap rate, and waste of filament raw materials. Therefore, there is an urgent need for a device that can effectively pre-open and loosen the filament bundle before it enters the forming machine and maintain constant tension. Summary of the Invention

[0004] The technical problem solved by this invention: The purpose of this invention is to overcome the shortcomings of the prior art and provide a pre-opening tension stabilization device for tobacco tow. This device can perform two-stage pre-opening of the tow and detect and adjust the tension in real time during the opening and conveying process to ensure that the tow enters the filter rod forming machine with a constant tension, thereby improving the stability and consistency of the filter rod quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pre-opening tension stabilizing device for tobacco tow, installed between a tow feed package and a filter rod forming device, includes: A lifting module device is installed on the side of the filter rod forming device; The main body of the filament pre-opening tension stabilizing device is fixed to the extension arm of the lifting module device; The main body of the filament pre-opening tension stabilization device includes a mounting plate, on which the following components are sequentially fixed: a filament extraction motor roller device, a filament pressing roller device, a first-stage pre-opening device, a tension feedback belt guide device, and a second-stage pre-opening device. The extraction filament motor roller device and the pressing filament roller device are arranged horizontally and parallel to each other, forming a gap between them for a single filament to pass through; The pre-first stage opening device is located below the extraction filament motor roller device, and a guide positioning ring device is provided at its lower part. The tension feedback belt guide device is located below the extraction filament motor roller device and the pressing filament device; The pre-secondary opening device is located at the rear of the pressure bundle roller device.

[0006] Further defining the above scheme, the pre-stage opening device includes a large air collector cavity I, an air outlet plate I, and an openable cover plate I; The side of the large cavity I of the air collector is provided with an air inlet I, and an air source distribution rod I is provided at the air inlet inside. The air outlet plate I is provided with an upward dovetail-shaped air outlet slit I, the width of which is greater than the width of the air outlet slit of the pre-secondary loosening device; The openable cover plate I is connected to the air outlet plate I via a hinge I and is fixed by a magnet I. The cover plate I is provided with a handle I.

[0007] Further defining the above scheme, the pre-secondary opening device includes a large air collector cavity II, an air outlet plate II, and an openable cover plate II; The large cavity II of the air collector receives air from the side through a 90-degree bend, and an air source distribution rod II is provided at its air inlet. The air outlet plate II is provided with an upward-facing dovetail-shaped air outlet slit II; The openable cover plate II is connected to the air outlet plate II via hinge II and is fixed by magnetic attraction; An arc-shaped wire-stabilizing plate is also provided behind the air outlet of the pre-secondary opening device.

[0008] Further defining the above scheme, the tension feedback belt guide device includes a width limiting component, a non-powered steering roller, a tension swing arm component, a synchronous belt pulley component, and an angle sensor component; The width limiting component includes a width limiting bracket and a width limiting wheel. The width limiting wheel is fixed to the mounting plate by the width limiting bracket and is used to limit the width of the filament entering. Multiple unpowered steering rollers are provided and fixed on the mounting plate to change the direction of the filament bundle; The tension swing arm assembly includes two lightweight, non-powered feedback rollers, a lightweight swing rod, and a swing shaft. The lightweight, non-powered feedback rollers are mounted on the lightweight swing rod, which is connected to the swing shaft, which is connected to a mounting plate. The angle sensor assembly includes an angle sensor and a sensor mounting bracket, wherein the angle sensor is fixed to a mounting plate by the sensor mounting bracket. The synchronous belt pulley assembly includes synchronous pulley I, synchronous pulley II, and a synchronous belt. Synchronous pulley I is mounted on the angle sensor, and synchronous pulley II is mounted on the swing shaft. Synchronous pulley I and synchronous pulley II are connected by the synchronous belt.

[0009] Further defining the above scheme, in the tension feedback belt guide device, the filament bundle sequentially passes around the first unpowered steering roller, the first lightweight unpowered feedback roller on the lightweight swing arm, the second unpowered steering roller, the second lightweight unpowered feedback roller on the lightweight swing arm, the third unpowered steering roller, and the fourth unpowered steering roller.

[0010] Further defining the above scheme, the motor of the extraction filament motor roller device is a servo motor or a variable frequency motor, and its control system receives the analog signal fed back by the angle sensor in the tension feedback belt guide device, and adjusts the extraction speed in real time through a PID control algorithm to achieve constant tension control.

[0011] Further defining the above solution, the lifting module device is an electric push rod, a lead screw slide, or a cylinder-driven lifting mechanism, used to adjust the working height of the main body of the filament pre-opening tension stabilizing device to adapt to changes in the extraction height of the filament bundle.

[0012] The path of the filament bundle is as follows: it is drawn out from the filament bundle package, passes through the guide positioning ring device, the pre-first-stage opening device, the gap between the filament bundle extraction motor roller device and the pressing filament bundle roller device, the tension feedback belt guide device, the pre-second-stage opening device, and finally enters the input roller of the filter rod forming device.

[0013] Advantages of this invention compared to existing technologies: 1. This solution ensures constant tension and improved quality: Through closed-loop real-time feedback and control, tension fluctuations caused by changes in the height of the filament bundle are effectively eliminated, ensuring that the filament bundle maintains constant tension when entering the forming machine. This significantly reduces the shrinkage phenomenon and suction resistance fluctuations of the filter rod, and improves the stability of the filter rod quality. 2. This solution features a two-stage high-efficiency pre-opening: It adopts a uniquely designed two-stage air pressure opening device, which uses the hot air source of the main unit to gradually open the filament bundle. The opening effect is uniform and sufficient, which completely eliminates the internal stress of the filament bundle caused by packaging and transportation, and provides raw materials with uniform state for subsequent molding. 3. This solution features adaptive adjustment: The lifting module can adjust the working position of the entire device according to the real-time height of the filament bundle, ensuring the optimal extraction angle and initial tension, thus enhancing the adaptability of the equipment; 4. This solution has a compact structure and high integration: it integrates the functions of opening, traction, tension detection and control into one unit. The compact structure makes it easy to add and modify existing KDF equipment without requiring large-scale changes to the main unit. 5. This solution reduces losses and saves costs: Stable tension and good opening effect reduce filament breakage, skein slippage and scrap rate in the production process, directly saving raw and auxiliary materials such as filament bundles and reducing production costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall installation three-dimensional structure of the present invention; Figure 2 This is a front view of the overall installation structure of the present invention; Figure 3 This is an enlarged structural schematic diagram of the main body of the filament pre-opening tension stabilization device in this invention; Figure 4 This is a schematic diagram of the pre-stage opening device in this invention; Figure 5 This is a schematic diagram of the pre-secondary opening device in this invention; Figure 6 This is a schematic diagram of the tension feedback belt guide device in this invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0017] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] Please see Figure 1-6 The embodiments of the present invention are described in detail below.

[0019] like Figure 1 , Figure 2 , Figure 3As shown, the pre-opening tension stabilizing device for tobacco tow is installed on the right side of the filter rod forming device 2, located upstream of the tow package 1. It includes a lifting module device 3, which is fixed on the side of the main unit. Its extension arm 31 can be raised and lowered according to the height of the tow package 1, thereby driving the entire tension stabilizing device body to adjust to a suitable height.

[0020] The main body of the filament pre-opening tension stabilizing device is fixed on the extension arm 31 of the lifting module device 3. The main body of the filament pre-opening tension stabilizing device includes a mounting plate 10, on which the following components are sequentially fixed: a filament extraction motor roller device 4, a filament pressing roller device 5, a pre-first-stage opening device 6, a tension feedback belt guide device 7, and a pre-second-stage opening device 8. The filament extraction motor roller device 4 and the filament pressing roller device 5 are arranged horizontally and parallel to each other, forming a gap between them for a single strand of filament 100 to pass through. The pressure between them is adjustable, and they jointly clamp and pull the filament. The pre-first-stage opening device 6 is located below the filament extraction motor roller device 4, and a guide positioning ring device 9 is provided at its lower part; the tension feedback belt guide device 7 is located below the filament extraction motor roller device 4 and the filament pressing device 5; the pre-second-stage opening device 8 is located at the rear of the filament pressing roller device 5.

[0021] like Figure 4 As shown, the pre-stage opening device 6 includes a large air collector cavity I60, an air outlet plate I61, and an openable cover plate I62; the side of the large air collector cavity I60 is provided with an air inlet I64, and an air source distribution rod I601 is provided at the air inlet inside; the air outlet plate I61 is provided with an upward dovetail-shaped air outlet slit I611, the width of which is greater than the width of the air outlet slit of the pre-stage opening device 8; the openable cover plate I62 is connected to the air outlet plate I61 by a hinge I63 and is fixed by a magnet I66, and the cover plate I62 is provided with a handle I65.

[0022] The pre-stage opening device initially distributes airflow uniformity by changing the air inlet direction of the large cavity I60 of the air collector, and enlarges the air inlet I64 to allow air to enter from the side. Instead of using compressed cold air from an air compressor, it utilizes the dry air source provided by the main unit's own fan, which has a certain temperature. The large cavity design of the air collector enhances the air collection effect. An air distribution rod I601 is added at the air inlet of the large cavity I60 of the air collector, ensuring that the airflow from the air source to the air outlet plate I61 is evenly distributed from both sides. The air outlet of the air outlet plate I61 features an upward-facing dovetail-shaped air outlet gap I611 (aligned with the direction of the silk bundle's movement) that allows the silk bundle to pass through, increasing the opening area for airflow through the silk bundle. This facilitates the silk bundle's movement and ensures a wider opening width. Meanwhile, an openable cover plate I62 is added above the air outlet plate I61. When the yarn bundle is running, the air passing through the gap is blown upwards and downwards by the cover plate, increasing the opening area of ​​the yarn bundle. When manually threading the yarn bundle, the handle can be pulled out for easy threading. During operation, the yarn bundle passes through the guide positioning ring device 9, the air outlet plate I61, and the yarn bundle extraction motor roller device 4, and then enters the tension feedback belt guide device 7.

[0023] like Figure 5 As shown, the pre-secondary opening device 8 includes a large air collector cavity II80, an air outlet plate II81, and an openable cover plate II82. The large air collector cavity II80 receives air from the side through a 90-degree bend, and an air source distribution rod II801 is provided at its air inlet. The air outlet plate II81 has an upward dovetail-shaped air outlet slit II811. The openable cover plate II82 is connected to the air outlet plate II81 through a hinge II83 and is fixed by magnetic attraction. An arc-shaped wire stabilizing plate 84 is also provided behind the air outlet of the pre-secondary opening device 8.

[0024] The pre-stage opening device also improves the initial uniformity of airflow by changing the air intake direction of the large cavity II80 of the air collector. It enlarges the air inlet and introduces air from the side via a 90-degree bend, eliminating the need for compressed cold air from an air compressor. Instead, it utilizes the dry air source provided by the main unit's own fan, which has a certain temperature. The large cavity design of the air collector enhances the air collection effect. An air distribution rod II801 is added to the air inlet of the large cavity II80 of the air collector, ensuring that the airflow from the source to the outlet plate is evenly distributed from both sides. The outlet of the outlet plate II81 features an upward-sloping dovetail-shaped slit II811 (aligned with the direction of the filament bundle's movement) that allows the filament bundle to pass through, increasing the opening area and facilitating both the bundle's movement and ensuring the opening width. The opening of this slit is slightly smaller than the width of the outlet slit of the pre-stage opening device. Meanwhile, an openable cover plate II82 is added above the air outlet plate II81. When the yarn bundle passes through the air outlet gap II811 during operation, the air is blown upwards and downwards by the cover plate, increasing the opening area of ​​the yarn bundle. After passing through the arc-shaped yarn stabilizing plate 84, the pre-opened yarn bundle enters the input roller device of the main equipment 2.

[0025] The aforementioned pre-first-stage opening device and pre-second-stage opening device adopt a unique design of side air intake, large cavity air collection, uniform air distribution with distribution rod, and upward dovetail-shaped air outlet. Utilizing the main unit's own air source with suitable temperature and humidity, the device gently and fully opens the filament bundle, eliminating its internal stress.

[0026] like Figure 6As shown, the tension feedback belt guide device 7 includes a width limiting assembly, a non-powered steering roller 710, a tension swing arm assembly, a synchronous pulley assembly, and an angle sensor assembly. The width limiting assembly includes a width limiting bracket 711 and a width limiting wheel 712. The width limiting wheel 712 is fixed to the mounting plate 10 via the width limiting bracket 711, used to limit the width of the yarn bundle entering and prevent unstable inward and outward swaying when the yarn bundle enters the tension feedback belt guide device. Multiple non-powered steering rollers 710 are provided and fixed to the mounting plate 10, used to change the direction of yarn bundle travel and guide the yarn bundle. The tension swing arm assembly includes two lightweight non-powered feedback rollers 709, a lightweight swing rod 708, and a swing shaft 704. The lightweight non-powered feedback rollers 709 are mounted on the lightweight swing rod 708, which is connected to the swing shaft 704, which is connected to the mounting plate 10, used to provide real-time feedback of the tension feedback signal value during the yarn bundle pulling process. The angle sensor assembly includes an angle sensor 701 and a sensor mounting bracket 702. The angle sensor 701 is fixed to the mounting plate 10 via the sensor mounting bracket 702. It is used to convert the tension feedback signal during the filament pulling process into an analog signal of angle feedback and send it to the control system to control the real-time change of the filament extraction motor roller device to extract the filament, thereby achieving the purpose of constant tension in the filament. The synchronous pulley assembly includes synchronous pulley I 705, synchronous pulley II 706, and synchronous belt 707. Synchronous pulley I 705 is mounted on the angle sensor 701, and synchronous pulley II 706 is mounted on the swing shaft 704. Synchronous pulley I 705 and synchronous pulley II 706 are connected by synchronous belt 707 and are used for the conversion of tension feedback signals during the filament pulling process.

[0027] Design principle of tension feedback belt guide device: Since the speed of filament extraction reaches 600 meters / minute, in order to achieve stable tension control of the filament during the extraction process, a secondary tension release is used in the transmission design to achieve stable control. Under the action of the filament extraction motor roller device 4, the filament passes through the width limiting component, and then sequentially passes around the first unpowered steering roller 710 and the first lightweight unpowered feedback roller 709 on the lightweight swing rod 708, forming the first tension release. Then it passes through the second unpowered steering roller 710 and the second lightweight unpowered feedback roller 709 on the lightweight swing rod 708, forming the second tension release. Finally, it passes around the third and fourth unpowered steering rollers 710 and is fed upward into the pre-secondary opening device.

[0028] The working principle of the tension feedback belt guide device: The core of the tension feedback belt guide device is a swing arm mechanism with two lightweight rollers. This mechanism converts changes in the tension of the yarn bundle into angular displacement of the swing arm. A synchronous belt pulley mechanism then drives an angle sensor, converting the angular displacement into an analog electrical signal. This signal is fed back to the control system, which uses a PID algorithm to adjust the rotational speed of the yarn bundle extraction motor roller in real time, thus forming a closed-loop constant tension control system.

[0029] The motor of the extraction filament motor roller device 4 is a servo motor or a variable frequency motor. Its control system receives the analog signal fed back by the angle sensor 701 in the tension feedback belt guide device 7, and adjusts the extraction speed in real time through a PID control algorithm to achieve constant tension control.

[0030] The lifting module device 3 is a lifting mechanism driven by an electric push rod, a lead screw slide, or a cylinder. It is used to adjust the working height of the main body of the filament pre-opening tension stabilizing device to adapt to the change in the extraction height of the filament bundle 1.

[0031] Working principle and process: 1. Fiber bundle extraction and primary opening: The fiber bundle 100 is extracted from the fiber bundle package 1 and first passes through the guide positioning ring device 9 for initial positioning. It then enters the pre-primary opening device 6. (Example...) Figure 3 As shown, the hot air from the main unit enters the large cavity of the air collector I60 through the side air inlet I64. After being evenly distributed by the distribution rod I601, it is blown towards the air outlet plate I61. The filament bundle passes through the dovetail-shaped air outlet slit I611, and is subjected to the upward and lateral airflow, undergoing the first width expansion and stress release. The openable cover plate I62 guides the airflow to blow the filament bundle from top to bottom, enhancing the opening effect and effectively solving the stress problem caused by packaging and transportation of the filament bundle during unpacking.

[0032] 2. Traction and Tension Detection: After being opened, the filament bundle enters the gap between the filament bundle extraction motor roller device 4 and the filament bundle pressing roller device 5, and is actively pulled upwards, allowing the pre-opened filament bundle to be fully released to the corresponding position according to the production speed of the main equipment. The filament bundle then enters the tension feedback belt guide device 7. (Example...) Figure 4 As shown, the filament bundle sequentially passes over multiple unpowered steering rollers 710 and twice passes over two lightweight unpowered feedback rollers 709 mounted on a lightweight pendulum rod 708. When the tension of the filament bundle changes, it pulls the lightweight pendulum rod 708 to swing around the pendulum axis 704. The swing of the lightweight pendulum rod 708 is transmitted through the synchronous belt pulley assembly (705, 706, 707), driving the shaft of the angle sensor 701 to rotate, thereby converting the tension change into a measurable analog voltage or current signal.

[0033] 3. Closed-loop tension control: The angle sensor 701 transmits the detected real-time tension signal to the control system (such as a PLC). The control system compares this signal with the set tension target value, calculates the control quantity through a PID control algorithm, and dynamically adjusts the speed of the servo motor or variable frequency motor driving the filament extraction motor 4. For example, when the detected tension is too high, the drawing speed is slightly increased to reduce the filament tension; conversely, the speed is decreased. This forms a fast and precise closed-loop control circuit, ensuring that the tension applied to the filament remains essentially constant regardless of changes in the filament bundle height.

[0034] 4. Secondary Opening and Feeding to the Main Unit: After tension stabilization control, the filament bundle continues to rise into the pre-secondary opening device 8. Its working principle is similar to that of the pre-primary opening device 6, but the width of the air outlet gap II 811 is slightly smaller, allowing for more precise secondary opening and shaping of the filament bundle. The arc-shaped filament stabilizing plate 84 is used to organize the filament bundle, and finally it is smoothly fed into the input roller device of the main unit equipment to enter the subsequent filter rod forming process.

[0035] Lifting adjustment: During the production process, the operator can set or automatically control the working height of the lifting module device 3 through the control panel, so that the guide positioning ring device 9 always maintains a better relative position with the top layer of the filament bundle, ensuring that the filament bundle can be pulled out at a smooth angle and reducing the initial tension change.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pre-opening tension stabilizing device for tobacco tow, installed between a tow feed package (1) and a filter rod forming device (2), characterized in that: include: The lifting module device (3) is installed on the side of the filter rod forming device (2); The main body of the filament pre-opening tension stabilizing device is fixed on the extension arm (31) of the lifting module device (3); The main body of the pre-opening tension stabilizing device for the filament bundle includes a mounting plate (10), on which the following are fixed in sequence: a filament bundle extraction motor roller device (4), a filament bundle pressing roller device (5), a first-stage pre-opening device (6), a tension feedback belt guide device (7), and a second-stage pre-opening device (8). The extraction filament motor roller device (4) and the pressing filament roller device (5) are arranged horizontally and parallel to each other, forming a gap between them for a single filament bundle (100) to pass through; The pre-first stage opening device (6) is located below the extraction filament motor roller device (4), and a guide positioning ring device (9) is provided at its lower part. The tension feedback belt guide device (7) is located below the extraction filament motor roller device (4) and the pressing filament device (5); The pre-secondary opening device (8) is located at the rear of the pressing bundle roller device (5); The lifting module device (3) is an electric push rod, screw slide or cylinder driven lifting mechanism, used to adjust the working height of the main body of the filament pre-opening tension stabilizing device to adapt to the change in the extraction height of the filament bundle (1).

2. The tobacco tow pre-opening tension stabilizing device according to claim 1, characterized in that: The pre-stage opening device (6) includes a large air collector cavity I (60), an air outlet plate I (61), and an openable cover plate I (62); The side of the large cavity I (60) of the air collector is provided with an air inlet I (64), and an air source distribution rod I (601) is provided at the air inlet inside. The air outlet plate I (61) is provided with an upward dovetail-shaped air outlet slit I (611), and the width of the air outlet slit I (611) is greater than the width of the air outlet slit of the pre-secondary loosening device (8). The openable cover plate I (62) is connected to the air outlet plate I (61) via hinge I (63) and is fixed by magnet I (66). The openable cover plate I (62) is provided with handle I (65).

3. The tobacco tow pre-opening tension stabilizing device according to claim 1, characterized in that: The pre-secondary loosening device (8) includes a large air collector cavity II (80), an air outlet plate II (81), and an openable cover plate II (82). The large cavity II (80) of the air collector is air-intaken from the side through a 90-degree bend, and an air source distribution rod II (801) is provided at its air inlet. The air outlet plate II (81) is provided with an upward dovetail-shaped air outlet slit II (811); The openable cover plate II (82) is connected to the air outlet plate II (81) via hinge II (83) and is fixed by magnetic attraction; An arc-shaped wire stabilizing plate (84) is also provided behind the air outlet of the pre-secondary opening device (8).

4. The tobacco tow pre-opening tension stabilizing device according to claim 1, characterized in that: The tension feedback belt guide device (7) includes a width limiting component, a non-powered steering roller (710), a tension swing arm component, a synchronous belt pulley component, and an angle sensor component; The width limiting component includes a width limiting bracket (711) and a width limiting wheel (712). The width limiting wheel (712) is fixed on the mounting plate (10) by the width limiting bracket (711) to limit the width of the filament bundle entering. Multiple unpowered steering rollers (710) are provided and fixed on the mounting plate (10) for changing the direction of the filament bundle; The tension swing arm assembly includes two lightweight, non-powered feedback rollers (709), a lightweight swing rod (708), and a swing shaft (704). The lightweight, non-powered feedback rollers (709) are mounted on the lightweight swing rod (708), which is connected to the swing shaft (704). The swing shaft (704) is connected to the mounting plate (10). The angle sensor assembly includes an angle sensor (701) and a sensor mounting bracket (702), wherein the angle sensor (701) is fixed to the mounting plate (10) by the sensor mounting bracket (702); The synchronous pulley assembly includes synchronous pulley I (705), synchronous pulley II (706) and synchronous belt (707). Synchronous pulley I (705) is mounted on angle sensor (701), synchronous pulley II (706) is mounted on swing shaft (704), and synchronous pulley I (705) and synchronous pulley II (706) are connected by synchronous belt (707).

5. The tobacco tow pre-opening tension stabilizing device according to claim 4, characterized in that: In the tension feedback belt guide device (7), the filament bundle sequentially passes around the first unpowered steering roller (710), the first lightweight unpowered feedback roller (709) on the lightweight swing rod (708), the second unpowered steering roller (710), the second lightweight unpowered feedback roller (709) on the lightweight swing rod (708), the third unpowered steering roller (710), and the fourth unpowered steering roller (710).

6. The tobacco tow pre-opening tension stabilizing device according to claim 1, characterized in that: The motor of the extraction filament motor roller device (4) is a servo motor or a variable frequency motor. Its control system receives the analog signal fed back by the angle sensor (701) in the tension feedback belt guide device (7), and adjusts the extraction speed in real time through the PID control algorithm to achieve constant tension control.

Images