Traction mechanism of strip bag

Abstract

This utility model provides a traction mechanism for a strip bag, including a mounting plate, two sets of traction units, two sets of pulley units, and a drive assembly. The two sets of traction units are arranged vertically along the mounting plate and located on the mounting plate. Each traction unit includes multiple first traction groups and multiple second traction groups, which are alternately distributed along the length of the mounting plate. The two sets of pulley units correspond one-to-one with the two sets of traction units, and each set of pulley units drives the corresponding traction unit to rotate. Each set of pulley units includes a first synchronous belt and a second synchronous belt, located on the same side of the mounting plate and distributed parallel and staggered. The first synchronous belt drives the first traction group to rotate, and the second synchronous belt drives the second traction group to rotate. The drive assembly is connected to the pulley units to drive their movement. In this embodiment, the first and second synchronous belts drive the first and second traction units respectively, extending the service life of the synchronous belts.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, and in particular to a traction mechanism for strip bags. Background Technology

[0002] In the field of automated packaging equipment, strip bag packaging equipment is a key piece of equipment due to its compact structure, high production efficiency, and wide applicability. Existing strip bag machines typically use servo motors to transmit power to various traction roller groups via synchronous belt drives to tighten, guide, and precisely position the strip bags, ensuring the accuracy of subsequent cutting processes. However, in actual high-speed operation, the synchronous belt needs to sequentially wrap around the drive pulley, transition pulley, tensioning pulley, and multiple sets of traction rollers, forming a complex and compact winding path. Limited by installation space, the center distance between the rollers is generally small, and the bending radius of the synchronous belt at each inflection point is too small. Long-term high-frequency alternating bending in both directions and wrapping around too many rollers makes the synchronous belt prone to fatigue breakage, shortening its service life. Utility Model Content

[0003] In order to improve at least some of the shortcomings or deficiencies in the prior art, the embodiments of this utility model provide a traction mechanism for a strip bag, which avoids the problem of fatigue and damage caused by excessive winding of a single synchronous belt with rollers, and extends the service life of the synchronous belt.

[0004] On one hand, the present invention provides a traction mechanism for a strip bag, comprising: a mounting plate; two sets of traction parts, arranged along the vertical direction of the mounting plate and located on the mounting plate; each set of traction parts includes multiple sets of first traction groups and multiple sets of second traction groups, the multiple sets of first traction groups and the multiple sets of second traction groups being alternately distributed along the length direction of the mounting plate; each set of first traction groups includes two sets of first rollers with opposite rotation directions, each set of second traction groups includes two sets of second rollers with opposite rotation directions, and a guide channel is formed between each pair of first rollers and between each pair of second rollers; two sets of pulleys, corresponding one-to-one with the two sets of traction parts, and each set of pulleys drives the corresponding traction part to rotate; each set of pulleys includes a first synchronous belt and a second synchronous belt, the first synchronous belt and the second synchronous belt being located on the same side of the mounting plate and distributed in parallel and staggered, the first synchronous belt driving the first traction group to rotate, and the second synchronous belt driving the second traction group to rotate; and a drive assembly connected to the pulleys to drive the pulleys to move.

[0005] In some embodiments, each first roller group includes a first shaft and a first roller and a first transmission bearing respectively connected to both ends of the first shaft. The first roller is located on the side of the mounting plate away from the pulley portion, and the first transmission bearing is located on the side of the mounting plate near the pulley portion. Each second roller group includes a second roller, a second transmission bearing, a second shaft, and a bushing. One end of the second shaft is connected to the second roller, and the other end of the second shaft is connected to the second transmission bearing. The bushing is sleeved on the second shaft. The second roller is located on the side of the mounting plate away from the pulley portion, and the second transmission bearing and the bushing are located on the side of the mounting plate near the pulley portion. The bushing is located between the second transmission bearing and the mounting plate. The first synchronous belt drives the first transmission bearing to rotate, and the second synchronous belt drives the second transmission bearing to rotate.

[0006] In some embodiments, within each group of the first traction groups, the first synchronous belt is alternately wound around the outside of the two first drive bearings; within each group of the second traction groups, the first synchronous belt is alternately wound around the outside of each of the bushings; between adjacent first traction groups and second traction groups, the first synchronous belt is wound parallel to the outside of adjacent first drive bearings and bushings.

[0007] In some embodiments, the second synchronous belt is alternately wound around each of the second transmission bearings.

[0008] In some embodiments, the traction unit further includes a first tensioner assembly, wherein both the first synchronous belt and the second synchronous belt bypass the first tensioner assembly.

[0009] In some embodiments, the traction unit further includes a second tensioner assembly, with the first timing belt bypassing the second tensioner assembly.

[0010] In some embodiments, the drive assembly includes a servo motor, a drive bearing, two sets of transition bearing assemblies, and a third synchronous belt. The servo motor is connected to the drive bearing, and the two sets of transition bearing assemblies correspond one-to-one with the two sets of pulley portions. The drive bearing is located on the side of the mounting plate away from the pulley portions. Each set of transition bearing assemblies includes two coaxially arranged transition bearings, which are respectively located on the side of the mounting plate near or away from the pulley portions. The transition bearing located on the side of the mounting plate away from the pulley portions is connected to the drive bearing via the third synchronous belt, and the transition bearing located on the side of the mounting plate near the pulley portions is connected to the traction unit via the pulley portions.

[0011] In some embodiments, V-shaped grooves are provided on the circumferential surfaces of both the first roller and the second roller.

[0012] In some embodiments, the surface of the V-shaped groove is provided with an adhesive layer.

[0013] As can be seen from the above, the above-mentioned technical features of this utility model can have one or more of the following beneficial effects: by setting a first synchronous belt to drive the first traction group to rotate, and setting a second synchronous belt to drive the second traction group to rotate, the bending radius of the synchronous belt is increased and the service life of the synchronous belt is extended. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a front view structural diagram of a traction mechanism for a strip bag provided in an embodiment of the present utility model.

[0016] Figure 2 This is a top view of a traction mechanism for a strip bag, provided as an embodiment of the present invention.

[0017] Figure 3 for Figure 1 The diagram shows an enlarged view of the structure at point A of the traction mechanism for a strip bag.

[0018] Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point B of the traction mechanism for a strip bag.

[0019] Figure 5 for Figure 2 The diagram shows a cross-sectional view of the traction mechanism of a strip bag along C-C'.

[0020] Figure 6 This is a schematic diagram of the installation of the second synchronous belt of a traction mechanism for a strip bag, provided as an embodiment of the present invention.

[0021] Figure 7 This is a side view of a traction mechanism for a strip bag, provided as an embodiment of the present invention.

[0022] Figure label:

[0023] 10. Mounting plate; 210. First traction group; 211. First roller group; 2111. First roller; 2112. First transmission bearing; 2113. First rotating shaft; 220. Second traction group; 221. Second roller group; 2211. Second roller; 2212. Second transmission bearing; 2213. Second rotating shaft; 2214. Bushing; 230. Guide channel; 240. First tensioning wheel group; 250. Second tensioning wheel group; 30. Pulley section; 310. First synchronous belt; 320. Second synchronous belt; 40. Drive assembly; 410. Servo motor; 420. Drive bearing; 430. Transition bearing assembly; 440. Third synchronous belt; 510. V-groove; 520. Rubber coating layer. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] See Figure 1 , Figure 2 and Figure 3 This utility model provides a traction mechanism for strip bags, including a mounting plate 10, two sets of traction units, two sets of pulley units 30, and a drive assembly 40. The mounting plate 10 is fixed to the frame of the strip bag machine, for example, by bolts, serving as the support base for the entire traction mechanism. The two sets of traction units are arranged along the vertical direction of the mounting plate 10 and are located on the mounting plate 10, that is, the two sets of traction units are arranged along the transport direction of the strip bags. Each set of traction units includes multiple sets of first traction groups 210 and multiple sets of second traction groups 220, which are alternately distributed along the length direction of the mounting plate 10. Each set of first traction groups 210 includes two sets of first rollers 211 with opposite rotation directions, and each set of second traction groups 220 includes two sets of second rollers 221 with opposite rotation directions. A guide channel 230 is formed between every two sets of first rollers 211 and between every two sets of second rollers 221.

[0026] The two first roller groups 211 in each first traction group 210 are arranged along the length of the mounting plate 10. After completing the unwinding, filling, longitudinal sealing, and transverse sealing processes, the strip bag can pass through the guide channel 230 between the two first roller groups 211 in each first traction group 210, or through the guide channel 230 between the two second roller groups 221 in each second traction group 220. The two first roller groups 211 rotating in opposite directions and the two second roller groups 221 apply downward friction force simultaneously on both sides of the strip bag, forming an active traction force to provide auxiliary guidance for the strip bag, tightening and straightening the strip bag, restricting the freedom of the strip bag in the up-down and front-back directions, improving the accuracy of the cutting position of the cutter in the subsequent cutting process, and ensuring product precision. For example, in each first traction group 210, one of the two first roller groups 211 rotates clockwise, and the other roller group rotates counterclockwise, together assisting the strip bag to move downward; in each second traction group 220, one of the two second roller groups 221 rotates clockwise, and the other roller group rotates counterclockwise, together assisting the strip bag to move downward.

[0027] Two sets of pulley sections 30 correspond one-to-one with two sets of traction sections, and each set of pulley sections 30 drives the corresponding traction section to rotate. Each set of pulley sections 30 may, for example, include a first synchronous belt 310 and a second synchronous belt 320. The first synchronous belt 310 and the second synchronous belt 320 are located on the same side of the mounting plate 10 and are distributed in parallel and staggered. The first synchronous belt 310 drives the first traction group 210 to rotate, and the second synchronous belt 320 drives the second traction group 220 to rotate. The drive assembly 40 is connected to the pulley section 30 to drive the pulley section 30 to move, that is, the drive assembly 40 drives the first synchronous belt 310 and the second synchronous belt 320 to rotate.

[0028] During operation, the drive assembly 40 drives the pulley section 30 to move, which in turn drives the first synchronous belt 310 and the second synchronous belt 320 to start synchronously. After the strip bag is output from the upstream longitudinal sealing and transverse sealing station, it first enters the traction section. The two sides of the strip bag are clamped by the oppositely rotating rollers of the two adjacent first roller groups 211 or the two adjacent second roller groups 221, which applies a downward traction force to the strip bag, keeping it taut. Then it enters the subsequent cutting station, preventing the actual cutting position of the strip bag from deviating from the preset position due to shaking, loosening or displacement during transportation, thus improving the final product accuracy.

[0029] In existing technologies, a single synchronous belt simultaneously drives the first traction group 210 and the second traction group 220. This requires the synchronous belt to contact both groups simultaneously, necessitating alternating wrapping around them. This results in excessive belt bending, a reduced bending radius, and consequently, a shorter lifespan. In this embodiment, by using a first synchronous belt 310 and a second synchronous belt 320, where the first belt 310 drives the first traction group 210 and the second belt 320 drives the second traction group 220, excessive winding of the single synchronous belt around the rollers is avoided. This reduces the number of bends, increases the bending radius, lowers local stress during operation, and extends the lifespan of both belts. The first synchronous belt 310 and the second synchronous belt 320 can be, for example, belts.

[0030] Among them, along the direction of movement perpendicular to the bag ( Figure 1 In the X direction (where the bag moves), the first synchronous belt 310 and the second synchronous belt 320 are located in the same plane and are arranged in parallel, without interfering with each other, thus satisfying the spatial layout of the device. Figure 2 As can be seen, the first synchronous belt 310 is located between the second synchronous belt 320 and the mounting plate 10; the first synchronous belt 310 and the second synchronous belt 320 are located, for example, on the opposite side of the mounting plate 10. The front side in the following text refers to the side of the mounting plate 10 facing the bag transport path, that is, the side of the mounting plate 10 away from the pulley portion 30; the reverse side refers to the side of the mounting plate 10 facing away from the bag transport path and where the pulley portion 30 is provided.

[0031] The distance between two adjacent first rollers 2111 in the first traction group 210 of the same group is adjustable. This distance can be adjusted according to different scenario requirements to adapt to scenarios with strip bags of different widths, thereby improving the applicability of the equipment. It is worth mentioning that the distance between two adjacent second rollers 2211 in the second traction group 220 of the same group is also adjustable, and its adjustment mode can be, for example, the adjustment of the distance between two adjacent first rollers 2111 in the first traction group 210.

[0032] See Figure 4In some embodiments, each first roller assembly 211 includes a first shaft 2113 and first rollers 2111 and first drive bearings 2112 respectively connected to both ends of the first shaft 2113. The first rollers 2111 are located on the side of the mounting plate 10 away from the pulley portion 30, and the first drive bearings 2112 are located on the side of the mounting plate 10 near the pulley portion 30. The first synchronous belt 310 drives the first drive bearings 2112 to rotate. The first shaft 2113 passes through the mounting plate 10 and is rotatably engaged with the mounting plate 10 through a bearing seat (not shown in the figure). The first rollers 2111 are located on the front side of the mounting plate 10 and are keyed to the first shaft 2113, allowing them to directly contact the surface of the bag and apply traction friction. The first drive bearings 2112 are located on the back side of the mounting plate 10 and are fixedly connected to the first shaft 2113, receiving drive torque. Specifically, the drive component 40 operates, causing the first synchronous belt 310 to move, which in turn causes the first transmission bearing 2112 to rotate. The first transmission bearing 2112 drives the first roller 2111 to rotate via the first rotating shaft 2113.

[0033] Each second roller assembly 221 includes a second roller 2211, a second transmission bearing 2212, a second rotating shaft 2213, and a bushing 2214. One end of the second rotating shaft 2213 is connected to the second roller 2211, and the other end of the second rotating shaft 2213 is connected to the second transmission bearing 2212. The bushing 2214 is sleeved on the second rotating shaft 2213. The second roller 2211 is located on the side of the mounting plate 10 away from the pulley portion 30, and the second transmission bearing 2212 and the bushing 2214 are located on the side of the mounting plate 10 close to the pulley portion 30. The bushing 2214 is located between the second transmission bearing 2212 and the mounting plate 10. The second synchronous belt 320 drives the second transmission bearing 2212 to rotate. The second roller 2211 has the same structure as the first roller 2111 and is located on the front of the mounting plate 10. The second rotating shaft 2213 passes through the mounting plate 10 and is rotatably engaged with the mounting plate 10 through a bearing seat (not shown in the figure). The second transmission bearing 2212 is located on the back of the mounting plate 10 and is fixedly connected to the second rotating shaft 2213 to receive driving torque. Specifically, when the drive assembly 40 operates, it drives the second synchronous belt 320 to move, which in turn drives the second transmission bearing 2212 to rotate. The second transmission bearing 2212 drives the second roller 2211 to rotate through the second rotating shaft 2213.

[0034] See Figure 5In some embodiments, within each first traction group 210, the first synchronous belt 310 is alternately wound around the outside of two first transmission bearings 2112; within each second traction group 220, the first synchronous belt 310 is alternately wound around the outside of each bushing 2214; between adjacent first traction groups 210 and second traction groups 220, the first synchronous belt 310 is wound parallel to the outside of adjacent first transmission bearings 2112 and bushings 2214. Compared with the prior art where the first synchronous belt 310 is alternately wound around the first traction group 210 and second traction group 220 throughout its entire length, this method adopts a parallel straight line arrangement at adjacent first transmission bearings 2112 and bushings 2214, reducing the total number of bends of the first synchronous belt 310, increasing the bending radius of the first synchronous belt 310, and improving the service life of the first synchronous belt 310.

[0035] Secondly, since the bushing 2214 is fitted on the second rotating shaft 2213, when the first synchronous belt 310 drives the bushing 2214 to rotate, only the bushing 2214 rotates idly, and the second rotating shaft 2213 and the second roller 2211 are not subjected to torque, thus ensuring that they remain stationary and ensuring that the second traction group 220 is driven independently by the second synchronous belt 320.

[0036] See Figure 6 In some embodiments, the second synchronous belt 320 is alternately wound around each of the second transmission bearings 2212. The distance between the inflection points of the second synchronous belt 320 between two adjacent second traction groups 220 is lengthened, increasing the bending radius of the second synchronous belt 320 between two adjacent second traction groups 220, avoiding fatigue fracture of the second synchronous belt 320 due to severe bending, and increasing the service life of the second synchronous belt 320.

[0037] See Figure 2 , Figure 3 , Figure 5 ,and Figure 6 In some embodiments, to ensure that the first synchronous belt 310 and the second synchronous belt 320 remain taut and to guarantee reliable transmission, the traction unit further includes a first tensioning pulley group 240, with both the first synchronous belt 310 and the second synchronous belt 320 bypassing the first tensioning pulley group 240. The first tensioning pulley group 240 synchronously adjusts the first synchronous belt 310 and the second synchronous belt 320, keeping them taut and thus ensuring reliable transmission.

[0038] See Figure 2 , Figure 3 , Figure 5 ,and Figure 6In some embodiments, the traction unit further includes a second tensioning pulley group 250, around which the first synchronous belt 310 passes. Since the first synchronous belt 310 and the second synchronous belt 320 have different lengths (as shown in the figure, the first synchronous belt 310 is longer than the second synchronous belt 320), after adjustment of the first tensioning pulley group 240, there is a tension difference between the first synchronous belt 310 and the second synchronous belt 320. The first synchronous belt 310 can be readjusted using the second tensioning pulley group 250 to ensure that both the first synchronous belt 310 and the second synchronous belt 320 are within their optimal tension range.

[0039] See 1 and Figure 2 In some embodiments, the drive assembly 40 includes a servo motor 410, a drive bearing 420, two sets of transition bearing assemblies 430, and a third synchronous belt 440. The servo motor 410 is connected to the drive bearing 420, and the two sets of transition bearing assemblies 430 correspond one-to-one with the two sets of pulley portions 30. The drive bearing 420 is located on the side of the mounting plate 10 away from the pulley portion 30, that is, the drive bearing 420 is located on the front side of the mounting plate 10. Each set of transition bearing assemblies 430 includes two coaxially arranged transition bearings, and... The transition bearing is not located on the side of the mounting plate 10 closest to or furthest from the pulley portion 30. The transition bearing on the side of the mounting plate 10 furthest from the pulley portion 30 is connected to the drive bearing 420 via a third synchronous belt 440. In other words, the transition bearing on the front side of the mounting plate 10 is connected to the drive bearing 420 via the third synchronous belt 440. The transition bearing on the side of the mounting plate 10 closest to the pulley portion 30 is connected to the traction unit via the pulley portion 30. In other words, the transition bearing on the back side of the mounting plate 10 is connected to the traction unit via the pulley portion. The third synchronous belt 440 is, for example, a belt.

[0040] During operation, the output of the servo motor 410 drives the active bearing 420 to rotate. The active bearing 420 drives the two transition bearings on the front of the mounting plate 10 to rotate via the third synchronous belt 440. The transition bearings on the back of the mounting plate 10 rotate synchronously. The two transition bearings on the back drive the two sets of traction parts to rotate via the two sets of pulleys 30 respectively.

[0041] See Figure 7 In some embodiments, V-shaped grooves 510 are provided on the circumferential surfaces of the first roller 2111 and the second roller 2211. The V-shaped grooves 510 can increase the contact area between the first roller 2111, the second roller 2211 and the bag, thereby increasing the friction and tightening effect. The structure is simple and effective.

[0042] See Figure 7In some embodiments, the surface of the V-shaped groove 510 is provided with an adhesive layer 520. The adhesive layer 520 is used to increase the friction of the surface of the V-shaped groove 510. That is, the adhesive layer 520 can increase the friction and tension between the first roller 2111 and the bag, and between the second roller 2211 and the bag.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of this utility model. Provided that the technical features do not conflict, the structure is not contradictory, and the purpose of this utility model is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pulling mechanism for a bag-on-chip, characterized in that, include: Mounting plate (10); Two sets of traction units are arranged along the vertical direction of the mounting plate (10) and located on the mounting plate (10); each set of traction units includes multiple sets of first traction groups (210) and multiple sets of second traction groups (220), the multiple sets of first traction groups (210) and the multiple sets of second traction groups (220) are alternately distributed along the length direction of the mounting plate (10); each set of first traction groups (210) includes two sets of first rollers (211) with opposite rotation directions, each set of second traction groups (220) includes two sets of second rollers (221) with opposite rotation directions, and a guide channel (230) is formed between each pair of first rollers (211) and between each pair of second rollers (221); Two sets of pulley sections (30) correspond one-to-one with two sets of traction sections, and each set of pulley sections (30) drives the corresponding traction section to rotate; each set of pulley sections (30) includes a first synchronous belt (310) and a second synchronous belt (320), the first synchronous belt (310) and the second synchronous belt (320) are located on the same side of the mounting plate (10) and are distributed in parallel and staggered, the first synchronous belt (310) drives the first traction group (210) to rotate, and the second synchronous belt (320) drives the second traction group (220) to rotate; A drive assembly (40) is connected to the pulley section (30) to drive the pulley section (30) to move.

2. The traction mechanism for the strip bag as described in claim 1, characterized in that, Each of the first roller groups (211) includes a first shaft (2113) and a first roller (2111) and a first transmission bearing (2112) respectively connected to both ends of the first shaft (2113). The first roller (2111) is located on the side of the mounting plate (10) away from the pulley portion (30), and the first transmission bearing (2112) is located on the side of the mounting plate (10) close to the pulley portion (30). Each second roller assembly (221) includes a second roller (2211), a second transmission bearing (2212), a second rotating shaft (2213), and a bushing (2214). One end of the second rotating shaft (2213) is connected to the second roller (2211), and the other end of the second rotating shaft (2213) is connected to the second transmission bearing (2212). The bushing (2214) is sleeved on the second rotating shaft (2213). The second roller (2211) is located on the side of the mounting plate (10) away from the pulley portion (30). The second transmission bearing (2212) and the bushing (2214) are located on the side of the mounting plate (10) closer to the pulley portion (30), and the bushing (2214) is located between the second transmission bearing (2212) and the mounting plate (10). The first synchronous belt (310) drives the first transmission bearing (2112) to rotate, and the second synchronous belt (320) drives the second transmission bearing (2212) to rotate.

3. The traction mechanism for the strip bag as described in claim 2, characterized in that, Within each of the first traction groups (210), the first synchronous belt (310) is alternately wound around the outside of the two first transmission bearings (2112); within each of the second traction groups (220), the first synchronous belt (310) is alternately wound around the outside of each of the bushings (2214); between adjacent first traction groups (210) and second traction groups (220), the first synchronous belt (310) is wound in parallel around the outside of adjacent first transmission bearings (2112) and bushings (2214).

4. The traction mechanism for the strip bag as described in claim 2, characterized in that, The second synchronous belt (320) is alternately wound around each of the second transmission bearings (2212).

5. The traction mechanism for the strip bag as described in claim 1, characterized in that, The traction unit also includes a first tensioner assembly (240), and both the first synchronous belt (310) and the second synchronous belt (320) bypass the first tensioner assembly (240).

6. The traction mechanism for the strip bag as described in claim 1, characterized in that, The traction unit also includes a second tensioner assembly (250), and the first synchronous belt (310) passes around the second tensioner assembly (250).

7. The traction mechanism for the strip bag as described in claim 1, characterized in that, The drive assembly (40) includes a servo motor (410), a drive bearing (420), two sets of transition bearing assemblies (430), and a third synchronous belt (440). The servo motor (410) is connected to the drive bearing (420), and the two sets of transition bearing assemblies (430) correspond one-to-one with the two sets of pulley portions (30). The drive bearing (420) is located on the side of the mounting plate (10) away from the pulley portion (30). Each set of transition bearing assemblies (430) includes two coaxially arranged transition bearings, which are respectively located on the side of the mounting plate (10) near or away from the pulley portion (30). The transition bearing located on the side of the mounting plate (10) away from the pulley portion (30) is connected to the drive bearing (420) through the third synchronous belt (440), and the transition bearing located on the side of the mounting plate (10) near the pulley portion (30) is connected to the traction unit through the pulley portion (30).

8. The traction mechanism for the strip bag as described in claim 2, characterized in that, Both the first roller (2111) and the second roller (2211) have V-shaped grooves (510) on their circumferential surfaces.

9. The traction mechanism for the strip bag as described in claim 8, characterized in that, The surface of the V-shaped groove (510) is provided with an adhesive layer (520).

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