Automatic opening device for tobacco rod tows

Abstract

The invention belongs to the technical field of cigarette rod tow opening, and particularly relates to an automatic cigarette rod tow opening device which comprises a supporting frame, a storage box, an auxiliary feeding assembly, a tension adjusting assembly and a lifting assembly. The auxiliary feeding assembly is arranged above the storage box and comprises two parallel installation plates, a traction motor is arranged on the side wall of one installation plate, a driving traction roller is connected to an output shaft of the traction motor through a coupler, a driven traction roller is arranged on one side of the driving traction roller, and the driven traction roller is connected to the output shaft of the traction motor through a coupler. The traction motor drives the driving traction roller to rotate to pull tows, and the tension adjusting assembly is arranged below the auxiliary feeding assembly. According to the device, the fluctuation range of the tension of the tows is effectively reduced, the opening quality is improved, the resolution capability of the device on tiny tension change is improved, and the detection sensitivity of the tension change is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of tobacco rod bundle opening technology, and in particular relates to an automatic tobacco rod bundle opening device. Background Technology

[0002] Cigarette rods, also known as cigarette filter rods, have a core manufacturing process in which the opening of the filament bundle is crucial. The goal is to draw the tightly wound cellulose acetate or polypropylene filament bundles from the bundle package and transform the bundle's initial "ribbon" state into uniform and fluffy monofilaments or small bundle units. This provides a stable foundation for subsequent plasticizer application and rolling. The quality of the filament bundle opening directly affects the filter rod's suction resistance stability and physical properties.

[0003] Currently, the method for opening tobacco sticks is to draw the filament bundles out of the bundle and directly introduce them into the opening machine, which then pulls and opens the filament bundles.

[0004] The existing device also has the following shortcomings:

[0005] 1. The tension of the filament bundle fluctuates greatly during the conveying process. In particular, the different degrees of compaction between the head and tail of the bundle cause inconsistent lifting tension, resulting in excessive fluctuations in the suction resistance index of the filter rod and affecting the opening quality.

[0006] 2. If the filament bundles are not effectively pretreated before opening, there will be a lot of dust and impurities. The filament bundles are prone to clumping due to dust adhesion, making it difficult for the opening machine to evenly disperse the filament bundles. This will not only prolong the processing time of the opening process, but also make the structure of the filament bundles after opening uneven, affecting the consistency of subsequent filter rod forming. Summary of the Invention

[0007] The purpose of this invention is to address the problems mentioned in the background art by providing an automatic opening device for tobacco rod bundles.

[0008] To achieve the above objectives, the present invention employs the following technical solution: an automatic tobacco rod tow unwinding device, comprising:

[0009] Support frame;

[0010] A storage box, located inside the support frame, is used to store the filament bundles, and a weighing sensor is installed inside the storage box;

[0011] An auxiliary feeding assembly is located above the storage box and includes two parallel mounting plates. One of the mounting plates has a traction motor on its side wall. The output shaft of the traction motor is connected to an active traction roller via a coupling. A driven traction roller is located on one side of the active traction roller. The traction motor drives the active traction roller to rotate and pull the filament bundle.

[0012] A tension adjustment component is located below the auxiliary feeding component and is used to detect the tension of the filament bundle in real time and adjust the tension of the filament bundle accordingly.

[0013] The lifting assembly, located inside the support frame, includes a vertical rod with a ball screw slide rail on the vertical rod. A slider is slidably fitted on the ball screw slide rail. The mounting plate is fixed to the slider by a support arm. When the slider moves along the ball screw slide rail, it drives the mounting plate to move synchronously.

[0014] Furthermore, the tension adjustment assembly includes two guide rollers arranged vertically between two mounting plates and a tension detection roller arranged between the two guide rollers. Slide rails are fixed on the side walls of both mounting plates, and movable blocks are slidably fitted inside the slide rails. The two ends of the tension detection roller are respectively rotatably fitted with the two movable blocks.

[0015] Furthermore, the tension adjustment assembly also includes a fixed block fixed in the slide rail, and a first spring is provided between the movable block and the fixed block. When the tension of the yarn bundle increases, the yarn bundle will squeeze the tension detection roller, thereby causing the movable block to move towards the fixed block. The displacement of the movable block can directly reflect the magnitude of the change in yarn bundle tension.

[0016] Furthermore, the tension adjustment assembly also includes a cylindrical cavity formed inside the fixed block and a cylindrical groove communicating with the cylindrical cavity. The diameter of the cylindrical groove is smaller than the diameter of the cylindrical cavity. A piston plate is slidably connected to the cylindrical cavity. One end of the piston plate is fixed with a movable rod that penetrates the side wall of the fixed block, and the other end of the movable rod is fixed to the movable block. A detection plate is slidably connected to the cylindrical groove. A detachable end cap is fixed to the end of the cylindrical groove away from the cylindrical cavity. A displacement sensor is provided on the inner side wall of the end cap. A second spring is provided between the end cap and the detection plate. Hydraulic oil is filled in the cavity between the detection plate and the piston plate. When the movable block moves towards the fixed block, the piston plate squeezes the hydraulic oil to push the detection plate to move, and the displacement distance of the detection plate is greater than the displacement distance of the movable block.

[0017] Furthermore, the tension adjustment assembly also includes a PLC controller. The displacement sensor sends the displacement change data of the detection plate to the PLC controller, and the PLC controller adjusts the speed of the traction motor according to the displacement change data.

[0018] Furthermore, the weighing sensor monitors the weight of the filament bundles in the storage box in real time and sends the data to the PLC controller. The PLC controller controls the operation of the ball screw slide rail based on the data transmitted by the weighing sensor, so that the slider drives the mounting plate to move.

[0019] Furthermore, a blower pipe is rotatably arranged between the two mounting plates. The blower pipe is equipped with multiple blower heads. An air supply assembly for supplying air to the blower pipe is provided on the side wall of the mounting plate. The air supply assembly includes a drive circular plate fixed to both ends of the tension detection roller and an air pump fixed to the side wall of the mounting plate. A drive rod is fixed on the piston rod of the air pump. A U-shaped groove is opened on the drive rod. A cylindrical pin that slides with the U-shaped groove is provided on the drive circular plate. An air inlet head is rotatably connected to both ends of the blower pipe. The air inlet head is fixedly connected to the air outlet of the air pump through a U-shaped tube. When the drive circular plate rotates, the blower pipe blows air to the filament bundle in a pulse manner.

[0020] Furthermore, both ends of the blower tube are provided with swing power components for driving the blower tube to swing back and forth. The swing power components include ear seats fixed on the blower tube, a pull rod rotatably fitted on the ear seats, and a limit rod rotatably connected to the other end of the pull rod. An elliptical groove that slides with the limit rod is provided on the side wall of the driving circular plate near the mounting plate.

[0021] Compared with existing technologies, the advantages of this invention are:

[0022] 1. During the use of this invention, when the tension of the filament bundle increases, it squeezes the tension detection roller, causing the movable block to move towards the fixed position and compress the first spring. When the movable block moves, the piston plate moves synchronously within the cylindrical cavity, thereby pushing the detection plate to move within the cylindrical groove. Since the diameter of the cylindrical groove is smaller than the diameter of the cylindrical cavity, the displacement distance of the detection plate is greater than the displacement distance of the movable block. The displacement sensor feeds back the displacement of the detection plate to the PLC controller. After analyzing the data, the PLC controller reduces the speed of the traction motor to correct the tension of the filament bundle. Conversely, when the tension of the filament bundle decreases, the speed of the traction motor is increased to correct the tension. During the unwinding process of the filament bundle, the tension change is checked in real time and the tension is corrected, effectively reducing the fluctuation range of the filament bundle tension and improving the unwinding quality. In addition, by amplifying the displacement of the movable block, this invention improves the device's ability to distinguish minute tension changes and effectively improves the sensitivity of tension change detection.

[0023] 2. When using this invention, the tension detection roller rotates during the filament traction process, which in turn drives the drive disc to rotate, thereby driving the piston rod of the air pump to move back and forth, ultimately realizing pulsed air blowing from the air pipe onto the filament. The air pipe cleans the filament while blowing, and when the air pipe stops blowing, it allows the filament to return to stability, avoiding shape damage caused by continuous stress on the filament.

[0024] 3. When using this invention, the blower tube swings back and forth during the blowing process, which effectively expands the blowing range of the blower tube and improves the cleaning effect. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the overall structure of the automatic tobacco stick bundle unwinding device provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the structure between the two mounting plates in the automatic tobacco stick bundle unwinding device provided by the present invention;

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a schematic diagram of the internal structure of the fixing block in the automatic unwinding device for tobacco stick bundles provided by the present invention;

[0029] Figure 5 yes Figure 4 Enlarged view at point B in the middle;

[0030] Figure 6 This is a cross-sectional view of the structure between the two mounting plates after material feeding in the automatic tobacco stick bundle unwinding device provided by the present invention;

[0031] Figure 7 This is a schematic diagram of the lifting component structure in the automatic tobacco stick bundle unwinding device provided by the present invention;

[0032] Figure 8 This is a schematic diagram of the air supply component in the automatic tobacco rod bundle opening device provided by the present invention;

[0033] Figure 9 This is a schematic diagram of the oscillating power component in the automatic unwinding device for tobacco rod bundles provided by the present invention.

[0034] In the diagram, 1 is the support frame, 11 is the upright, 12 is the ball screw slide rail, 121 is the slider, 122 is the support arm, and 13 is the storage box.

[0035] 2. Mounting plate; 21. Traction motor; 22. Active traction roller; 23. Driven traction roller;

[0036] 31 Guide roller, 32 Tension detection roller, 33 Slide rail, 331 Movable block, 332 Fixed block, 333 First spring, 3321 Cylindrical cavity, 3322 Cylindrical groove, 3323 Piston plate, 3324 Movable rod, 3325 Detection plate, 3326 End cap, 3327 Displacement sensor, 3328 Second spring;

[0037] 4. Air blower, 41. Air blower head, 42. Drive plate, 43. Air pump, 431. Piston rod, 432. Drive rod, 4321. U-shaped groove, 421. Cylindrical pin, 40. Air inlet, 44. U-shaped tube, 45. Ear seat, 451. Pull rod, 452. Limiting rod, 453. Elliptical slide. Detailed Implementation

[0038] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] like Figures 1-7 As shown, the automatic tobacco tow opening device includes a support frame 1, a storage box 13, an auxiliary feeding component, a tension adjustment component, and a lifting component. The storage box 13 is located inside the support frame 1 and is used to store the tow bundle. A weighing sensor is installed inside the storage box 13. The storage box 13 has a door (not shown in the figure). A slot is opened at the top of the storage box 13 for a single layer of tow to pass through. In operation, the door of the storage box 13 is opened, the tow bundle is placed inside the storage box 13, and the tow is led out through the slot at the top of the storage box 13 and introduced into the auxiliary feeding component and the tension adjustment component. After being led out from the auxiliary feeding component and the tension adjustment component, the tow enters the opening machine (the opening machine uses existing technology and is not shown in the figure). The shape of the tow after passing through the auxiliary feeding component and the tension adjustment component is as follows. Figure 6 As shown;

[0040] The auxiliary feeding assembly is located above the storage box 13 and includes two parallel mounting plates 2. One of the mounting plates 2 has a traction motor 21 on its side wall. The output shaft of the traction motor 21 is connected to an active traction roller 22 via a coupling. A driven traction roller 23 is provided on one side of the active traction roller 22. The surfaces of both the active traction roller 22 and the driven traction roller 23 are treated with anti-slip coating. The active traction roller 22 is driven to rotate by the traction motor 21. The active traction roller 22 and the driven traction roller 23 cooperate to clamp the filament bundle and feed it forward.

[0041] The tension adjustment component is located below the auxiliary feeding component and is used to detect and adjust the tension of the yarn bundle in real time. The tension adjustment component includes two guide rollers 31 distributed vertically between two mounting plates 2 and a tension detection roller 32 between the two guide rollers 31. The surfaces of the guide rollers 31 and the tension detection roller 32 are treated with anti-slip treatment. Slide rails 33 are fixed on the side walls of the two mounting plates 2. Specifically, the slide rails 33 are detachably fixed to the mounting plates 2 by screws. Movable blocks 331 are slidably fitted inside the slide rails 33. The two ends of the tension detection roller 32 are respectively rotatably fitted with the two movable blocks 331. A push rod is provided between the two movable blocks 331. When feeding material, the push rod is pulled to move the tension detection roller 32 to facilitate feeding. In specific operation, the tension detection roller 32 abuts against the yarn bundle to provide initial tension to the yarn bundle. When the yarn bundle is conveyed upward, the tension detection roller 32 rotates under the action of friction.

[0042] The tension adjustment assembly also includes a fixed block 332 fixed in the slide rail 33. A first spring 333 is provided between the movable block 331 and the fixed block 332. When the tension of the yarn bundle increases, the horizontal component of the tension increases accordingly, so the yarn bundle will squeeze the tension detection roller 32, causing the movable block 331 to move towards the fixed block 332 and compress the first spring 333. Conversely, when the tension decreases, the movable block 331 moves towards the yarn bundle under the elastic force of the first spring 333. The displacement of the movable block 331 can directly reflect the magnitude of the change in yarn bundle tension.

[0043] The tension adjustment assembly also includes a cylindrical cavity 3321 formed inside the fixed block 332 and a cylindrical groove 3322 communicating with the cylindrical cavity 3321. The diameter of the cylindrical groove 3322 is smaller than the diameter of the cylindrical cavity 3321. A piston plate 3323 is slidably connected within the cylindrical cavity 3321. One end of the piston plate 3323 is fixed with a movable rod 3324 that penetrates the side wall of the fixed block 332. The other end of the movable rod 3324 is fixed to the movable block 331. A detection plate 3325 is slidably connected within the cylindrical groove 3322. A detachable end cap 3326 is fixed to the end of the cylindrical groove 3322 away from the cylindrical cavity 3321. A displacement sensor 3327 is provided on the inner side wall of 6. A second spring 3328 is provided between the end cover 3326 and the detection plate 3325. Hydraulic oil is filled in the cavity between the detection plate 3325 and the piston plate 3323. When the movable block 331 moves towards the fixed block 332, the piston plate 3323 squeezes the hydraulic oil to push the detection plate 3325 to move. Since the diameter of the cylindrical groove 3322 is smaller than the diameter of the cylindrical cavity 3321, the displacement distance of the detection plate 3325 is greater than the displacement distance of the movable block 331. By amplifying the displacement of the movable block 331, the device's ability to distinguish minute tension changes is improved, and the sensitivity of tension change detection is effectively improved.

[0044] The tension adjustment assembly also includes a PLC controller. The displacement sensor 3327 sends the displacement change data of the detection plate 3325 to the PLC controller. The PLC controller adjusts the speed of the traction motor 21 according to the displacement change data, thereby correcting the tension of the filament bundle, effectively reducing the fluctuation range of the tension of the filament bundle, and improving the opening quality.

[0045] The lifting assembly is located inside the support frame 1 and includes a vertical rod 11. A ball screw slide rail 12 is provided on the vertical rod 11, and a slider 121 is slidably fitted on the ball screw slide rail 12. The mounting plate 2 is fixed to the slider 121 by a support arm 122. The weighing sensor monitors the weight of the yarn bundle in the storage box 13 in real time and sends the data to the PLC controller. The PLC controller controls the ball screw slide rail 12 to operate according to the data transmitted by the weighing sensor, so that the slider 121 drives the mounting plate 2 to move. In specific operation, as the opening and loosening work continues, the yarn bundles in the yarn bundle are continuously drawn out, and the thickness and weight of the yarn bundle are continuously reduced. The weighing sensor transmits the real-time weight of the yarn bundle to the PLC controller. The PLC controller controls the mounting plate 2 to move down to compensate for the thickness loss of the yarn bundle, effectively reducing the tension fluctuation caused by the change in the thickness of the yarn bundle.

[0046] like Figure 8 As shown, a blower pipe 4 is rotatably arranged between two mounting plates 2. Multiple blower heads 41 are provided on the blower pipe 4, and the blower heads 41 are connected to the blower pipe 4. An air supply assembly for supplying air to the blower pipe is provided on the side wall of the mounting plate 2. The air supply assembly is covered with a protective shell. The air supply assembly includes a drive circular plate 42 fixed to both ends of the tension detection roller 32 and an air pump 43 fixed to the side wall of the mounting plate 2. A drive rod 432 is fixed to the piston rod 431 of the air pump 43. A U-shaped groove 4321 is provided on the drive rod 432. A cylindrical pin 421 that slides with the U-shaped groove 4321 is provided on the drive circular plate 42. Air inlets 40 are rotatably connected to both ends of the blower pipe 4. The air inlets 40 are connected to the air pump. The air outlet of 43 is fixedly connected by a U-shaped tube 44. Specifically, flanges are provided at both ends of the U-shaped tube 44, the air inlet head 40, and the air outlet of the air pump 43. The flanges at both ends of the U-shaped tube 44 are fixed to the flanges of the air inlet head 40 and the air outlet of the air pump 43, respectively. When the drive plate 42 rotates, the cylindrical pin 421 drives the drive rod 432 to move back and forth, thereby driving the drive rod 432 to pull the piston rod 431 of the air pump 43 back and forth, so that the air pump 43 generates a pulsed airflow into the blower pipe 4, thereby causing the blower pipe 4 to blow air to the filament bundle in a pulsed manner. When the blower pipe 4 blows air, it cleans the filament bundle. When the blower pipe 4 stops blowing air, it can restore the stability of the filament bundle and avoid the shape damage caused by continuous stress on the filament bundle.

[0047] like Figure 9As shown, the blower tube 4 is provided with swing power components at both ends for driving the blower tube 4 to swing back and forth. The swing power components include ear seats 45 fixed on the blower tube 4, and a pull rod 451 is rotatably fitted on the ear seats 45. The pull rod 451 is slidably fitted with the side wall of the mounting plate 2. The other end of the pull rod 451 is rotatably connected to a limit rod 452. An elliptical groove 453 is provided on the side wall of the drive plate 42 near the mounting plate 2, which is slidably fitted with the limit rod 452. When the drive plate 42 rotates, the limit rod 452 drives the pull rod 451 to move back and forth and pull the ear seats 45, thereby causing the blower tube 4 to swing back and forth, effectively expanding the blowing range of the blower tube 4 and improving the cleaning effect.

[0048] The working principle of this invention is as follows:

[0049] In practice, the filament bundle is placed inside the storage box 13. The filament bundle is then led out through the through slot at the top of the storage box 13 and introduced into the auxiliary feeding assembly and tension adjustment assembly. The shape of the filament bundle after passing through the auxiliary feeding assembly and tension adjustment assembly is as follows. Figure 6 As shown, the filament bundle is drawn out from the auxiliary feeding assembly and tension adjustment assembly and enters the opening machine (the opening machine adopts existing technology and is not shown in the figure). The traction motor 21 is turned on, and the rotation of the traction motor 21 drives the active traction roller 22 to rotate. The driven traction roller 23 cooperates with the active traction roller 22 to clamp the filament bundle and convey it forward.

[0050] When the tension of the filament bundle increases, the horizontal component of the tension force also increases, thereby pushing the tension detection roller 32 and the movable block 331 to move closer to the fixed block 332. As the movable block 331 moves, it drives the piston plate 3323 to move synchronously and squeeze the hydraulic oil. The hydraulic oil pushes the detection plate 3325 closer to the displacement sensor 3327. Since the diameter of the cylindrical groove 3322 is smaller than the diameter of the cylindrical cavity 3321, the displacement distance of the detection plate 3325 is greater than the displacement distance of the movable block 331. The displacement sensor 3327 detects the displacement of the detection plate 3325. The change data is sent to the PLC controller. The PLC controller controls the traction motor 21 to reduce the speed to correct the yarn tension based on the displacement change data. Conversely, when the yarn tension decreases, the PLC controller controls the traction motor 21 to increase the speed to correct the yarn tension based on the displacement change data. The yarn tension is continuously corrected during the tension detection process, which effectively reduces the fluctuation range of yarn tension and improves the opening quality. In addition, by amplifying the displacement of the movable block 331, the present invention improves the device's ability to distinguish minute tension changes and effectively improves the sensitivity of tension change detection.

[0051] When the tension detection roller 32 rotates, it drives the drive plate 42 to rotate, which in turn drives the drive rod 432 to move back and forth. The drive rod 432 pulls the piston rod 431 of the air pump 43 back and forth, causing the air pump 43 to generate pulsed airflow into the blower pipe 4, which in turn blows pulsed air onto the filament bundle. When the blower pipe 4 blows air, it cleans the filament bundle. When the blower pipe 4 stops blowing air, it allows the filament bundle to return to stability, avoiding shape damage caused by continuous stress on the filament bundle. In addition, when the drive plate 42 rotates, it drives the pull rod 451 to move back and forth under the action of the elliptical slide groove 453 and the limit rod 452. The pull rod 451 pulls the ear seat 45, causing the blower pipe 4 to swing back and forth, effectively expanding the blowing range of the blower pipe 4 and improving the cleaning effect.

[0052] Furthermore, as the filaments inside the bundle are continuously drawn out, the thickness and weight of the bundle decrease continuously. The weighing sensor transmits the real-time weight of the bundle to the PLC controller. The PLC controller controls the mounting plate 2 to move down to compensate for the thickness loss of the bundle, effectively reducing tension fluctuations caused by changes in the thickness of the bundle.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic unwinding device for tobacco rod bundles, characterized in that, include: Support frame (1); Storage box (13), located inside the support frame (1), is used to store the silk bundle. The storage box (13) is equipped with a weighing sensor. An auxiliary feeding assembly is located above the storage box (13) and includes two parallel mounting plates (2). One of the mounting plates (2) has a traction motor (21) on its side wall. The output shaft of the traction motor (21) is connected to an active traction roller (22) via a coupling. A driven traction roller (23) is provided on one side of the active traction roller (22). The active traction roller (22) is rotated by the traction motor (21) to pull the filament bundle. A tension adjustment component is located below the auxiliary feeding component and is used to detect the tension of the filament bundle in real time and adjust the tension of the filament bundle accordingly. The lifting assembly is located inside the support frame (1) and includes a vertical rod (11). A ball screw slide rail (12) is provided on the vertical rod (11). A slider (121) is slidably fitted on the ball screw slide rail (12). The mounting plate (2) is fixed to the slider (121) by a support arm (122). When the slider (121) moves along the ball screw slide rail (12), it drives the mounting plate 2 to move synchronously.

2. The automatic unwinding device for tobacco rod bundles according to claim 1, characterized in that, The tension adjustment assembly includes two guide rollers (31) arranged vertically between two mounting plates (2) and a tension detection roller (32) arranged between the two guide rollers (31). Slide rails (33) are fixed on the side walls of the two mounting plates (2). Movable blocks (331) are slidably fitted inside the slide rails (33). The two ends of the tension detection roller (32) are respectively rotatably fitted with the two movable blocks (331).

3. The automatic unwinding device for tobacco rod bundles according to claim 2, characterized in that, The tension adjustment assembly also includes a fixed block (332) fixed in the slide rail (33). A first spring (333) is provided between the movable block (331) and the fixed block (332). When the tension of the filament bundle increases, the filament bundle will squeeze the tension detection roller (32), thereby causing the movable block (331) to move towards the fixed block (332). The displacement of the movable block (331) can directly reflect the magnitude of the change in the tension of the filament bundle.

4. The automatic unwinding device for tobacco rod bundles according to claim 3, characterized in that, The tension adjustment assembly further includes a cylindrical cavity (3321) opened inside the fixed block (332) and a cylindrical groove (3322) communicating with the cylindrical cavity (3321). The diameter of the cylindrical groove (3322) is smaller than the diameter of the cylindrical cavity (3321). A piston plate (3323) is slidably connected in a sealed manner inside the cylindrical cavity (3321). One end of the piston plate (3323) is fixed with a movable rod (3324) penetrating the side wall of the fixed block (332), and the other end of the movable rod (3324) is fixed to the movable block (331). A detection plate (3325) is slidably connected in a sealed manner inside the cylindrical groove (3322). A detachable end cap (3326) is fixed to one end of the cylindrical groove (3322) away from the cylindrical cavity (3321). A displacement sensor (3327) is provided on the inner side wall of the end cap (3326). A second spring (3328) is provided between the end cap (3326) and the detection plate (3325). Hydraulic oil is filled in the cavity between the detection plate (3325) and the piston plate 3323. When the movable block (331) moves toward the fixed block (332), the piston plate (3323) squeezes the hydraulic oil to push the detection plate (3325) to move. The displacement distance of the detection plate (3325) is greater than the displacement distance of the movable block (331).

5. The automatic unwinding device for tobacco rod bundles according to claim 4, characterized in that, The tension adjustment assembly also includes a PLC controller. The displacement sensor (3327) sends the displacement change data of the detection plate (3325) to the PLC controller, and the PLC controller adjusts the speed of the traction motor (21) according to the displacement change data.

6. The automatic unwinding device for tobacco rod bundles according to claim 5, characterized in that, The weighing sensor monitors the weight of the filament bundle in the storage box (13) in real time and sends the data to the PLC controller. The PLC controller controls the ball screw slide rail (12) to operate according to the data transmitted by the weighing sensor, so that the slider (121) drives the mounting plate (2) to move.

7. The automatic unwinding device for tobacco rod bundles according to claim 2, characterized in that, A blower pipe (4) is rotatably disposed between the two mounting plates (2). The blower pipe (4) is provided with multiple blower heads (41). An air supply assembly for supplying air to the blower pipe is provided on the side wall of the mounting plate (2). The air supply assembly includes a drive circular plate (42) fixed to both ends of the tension detection roller (32) and an air pump (43) fixed to the side wall of the mounting plate (2). A drive rod (43) is fixed on the piston rod (431) of the air pump (43). 2) The drive rod (432) is provided with a U-shaped groove (4321), and the drive circular plate (42) is provided with a cylindrical pin (421) that slides with the U-shaped groove (4321). The two ends of the blow pipe (4) are sealed and rotatably connected with an air inlet (40). The air inlet (40) is fixedly connected to the air outlet of the air pump (43) through a U-shaped tube (44). When the drive circular plate (42) rotates, the blow pipe (4) blows air to the filament bundle in a pulse manner.

8. The automatic unwinding device for tobacco rod bundles according to claim 7, characterized in that, The blower tube (4) is provided with swing power components at both ends for driving the blower tube (4) to swing back and forth. The swing power components include ear seats (45) fixed on the blower tube (4). A pull rod (451) is rotatably fitted on the ear seat (45). The other end of the pull rod (451) is rotatably connected to a limit rod (452). An elliptical groove (453) that slides with the limit rod (452) is provided on the side wall of the drive plate (42) near the mounting plate (2).

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