Tightening packer
By using the coaxial linkage of the worm gear and the tightening wheel and the design of the end one-way bearing, the springback problem of the strapping tightening machine is solved, achieving higher locking reliability and binding effect, simplifying the structure and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU HANDPACK PACKAGING MASCH CO LTD
- Filing Date
- 2025-05-14
- Publication Date
- 2026-05-12
AI Technical Summary
The cumulative increase in backlash of multi-stage gears in existing strapping tightening machines can cause springback after the tightening wheel tightens, affecting the strapping effect.
The worm gear and the tensioning wheel are coaxially linked through the worm gear shaft, and a one-way bearing is installed on the worm gear shaft to form a double anti-backlash mechanism. The rotation of the tensioning wheel is directly locked by the worm gear reduction and the one-way bearing at the end, eliminating the risk of springback.
It effectively prevents springback, improves locking reliability, simplifies the structure, reduces costs, and enhances binding effect and mechanical stability.
Smart Images
Figure CN224225393U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of packaging machine technology, specifically to a tightening packaging machine. Background Technology
[0002] A strapping tightening machine is a specialized device that tightens the strapping straps tied to the packaged object (such as a box) to ensure that the strapping straps are stably tied to the packaged object.
[0003] Existing strapping tightening machines mainly include a drive unit, an output reduction mechanism linked to the drive unit, and a tightening mechanism linked to the output reduction mechanism. The output reduction mechanism consists of interconnected multi-stage reduction gears, a worm, and a worm wheel. The worm and worm wheel work together to transmit motion and power between intersecting shafts, typically with an intersecting angle of 90°. The tightening mechanism includes a tightening wheel linked to the worm wheel. The drive unit is connected to the multi-stage reduction gears via a drive shaft, and one-way bearings are installed on the drive shaft and the worm. Two one-way bearings are used to achieve unidirectional drive of the tightening wheel. However, the structural design of existing strapping tightening machines still has the following problems in actual use: the two one-way bearings are still some distance away from the tightening wheel, and multi-stage reduction gears are arranged between the one-way bearings and the tightening wheel. There is a gap in the gear meshing, and the backlash of the multi-stage gears will accumulate. When tightening the strapping, the one-way bearings rely on the tension transmitted by the gears to maintain a locked state, but the increased backlash will cause the tightening wheel to spring back after tightening, causing the strapping to loosen and affecting the binding effect. Utility Model Content
[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the cumulative increase in the backlash of the multi-stage gears in the existing strapping tightening machine will cause the tightening wheel to spring back after tightening, causing the strapping to loosen and affecting the binding effect. This invention provides a tightening and strapping machine that reduces springback, improves locking reliability, simplifies the structure, makes maintenance more convenient, and reduces costs.
[0005] To solve the above-mentioned technical problems, this utility model provides a tightening and packing machine, including a drive mechanism, a reduction mechanism, and a tightening mechanism connected in sequence. The reduction mechanism includes a worm and a worm wheel for transmitting torque between the drive mechanism and the tightening mechanism. The tightening mechanism includes a tightening frame and a tightening wheel that are movably disposed relative to the tightening base. The worm wheel has a worm wheel shaft that extends and rotatably disposed on the tightening frame. The tightening wheel is linkedly disposed on the worm wheel shaft. The worm wheel and the tightening wheel are coaxially linked on the tightening frame through the worm wheel shaft. A one-way bearing for limiting the worm wheel shaft to move in one direction is fixedly disposed between the worm wheel shaft and the tightening frame.
[0006] As a preferred embodiment, a bearing housing is fixedly installed inside the tightening frame. The bearing housing has a bearing groove suitable for installing the one-way bearing, and the worm gear shaft has a limiting boss that limits the one-way bearing in the bearing groove.
[0007] As a preferred embodiment, the bearing housing is provided with a through hole that connects to the bearing groove. One end of the worm gear shaft passes through a one-way bearing and the through hole and is connected to the tightening wheel. The other end of the worm gear shaft is rotatably connected to the tightening frame through a positioning bearing.
[0008] As a preferred embodiment, the worm gear and the tensioning wheel are respectively located on both sides of the bearing housing, and the bearing housing and the tensioning frame are connected to form a first space suitable for accommodating the worm gear, and the worm extends into the first space to mesh with the worm gear.
[0009] As a preferred embodiment, a side cover opposite to the bearing housing is installed on one side of the tightening frame, and a second space suitable for accommodating the tightening wheel is formed between the side cover and the bearing housing.
[0010] As a preferred embodiment, the tightening base includes a base body and a tape-releasing base plate connected to one side of the bottom of the base body. The tape-releasing base plate is provided with a tightening roller located below the tightening wheel, and the base body is provided with a support claw that cooperates with the tape-releasing base plate.
[0011] As a preferred embodiment, the tightening frame is rotatably connected to the tightening base via a connecting structure. The connecting structure includes connecting holes respectively provided on the base body and the tightening frame, and a rotating shaft passing through the connecting holes. One side of the base body is provided with a circular shaft portion extending axially along the connecting hole, and the connecting hole passes through the circular shaft portion. A torsion spring structure is sleeved on the circular shaft portion, connecting the base body and the tightening frame respectively. Under the action of the torsion spring structure, the tightening frame has a tendency to drive the tightening wheel to deflect towards the side closer to the tightening roller.
[0012] As a preferred embodiment, the tightening base further includes a guide hole in the base body through which the worm gear shaft can pass, and a rib structure on the other side of the base body. A loosening handle is installed on the top of the base body, and the bearing housing has a circular protrusion with a bearing groove connected in the guide hole.
[0013] As a preferred embodiment, the deceleration mechanism includes a deceleration housing with one end fixedly connected to the tensioning frame, a central gear shaft rotatably disposed within the deceleration housing, and at least one set of planetary gear assemblies connecting the central gear shaft and the worm gear. The central gear shaft is connected to the drive mechanism, and the deceleration housing extends a predetermined length along the axial direction of the central gear shaft.
[0014] As a preferred embodiment, the drive mechanism is a drive motor installed at the other end of the reduction gear housing, and the drive motor is linked to the central gear shaft via a coupling.
[0015] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:
[0016] 1. In the tightening and baling machine provided by this utility model, the worm gear and the tightening wheel are coaxially linked on the tightening frame through the worm gear shaft. A one-way bearing is installed on the worm gear shaft, which can directly lock the rotation of the tightening wheel and the worm gear. Even if there is backlash in the preceding multi-stage gears, the tightening wheel cannot rotate because the one-way bearing acts directly on the worm gear shaft at the end of the transmission chain, preventing reverse rotation and bypassing the influence of backlash in the intermediate transmission chain. This effectively prevents springback, improves the tightening effect and reliability. Furthermore, the one-way bearing is closer to the tightening wheel, resulting in a more direct and faster response, further enhancing the prevention of backlash. The tightening and baling machine using this technical solution triggers mechanical locking the instant the tightening action stops, eliminating the possibility of backlash, thereby reducing springback, improving locking reliability, simplifying the structure, making the structure more compact, and facilitating maintenance. This helps reduce costs and improve product performance.
[0017] 2. The tightening and packing machine provided by this utility model forms a dual anti-reverse mechanism through "worm gear reduction combined with end one-way bearing". This not only retains the mechanical gain of worm gear transmission, but also eliminates the risk of self-locking failure through physical locking, thereby reducing rebound and improving locking reliability. The improved tightening and packing machine has a significantly improved anti-rebound torque and has important application value in the field of packaging machinery.
[0018] 3. In the tightening and packing machine provided by this utility model, the bearing housing is embedded in the tightening frame as an independent module. The bearing groove and the outer ring of the one-way bearing are interference-fitted to achieve positioning and installation. The worm gear shaft limits the one-way bearing in the bearing groove through the limiting boss to achieve axial fixation of the one-way bearing. This installation design achieves high-precision positioning and rigid support for the one-way bearing, ensuring accurate installation of the one-way bearing, enhancing stability, extending service life, facilitating maintenance, and improving the anti-rebound effect through reliable positioning.
[0019] 4. In the tightening and packing machine provided by this utility model, the tightening frame is rotatably connected to the tightening base through the cooperation of the rotating shaft and the connecting hole, and a torsion spring structure is provided between the tightening frame and the tightening base. The function of the torsion spring is to bring the tightening wheel close to the tightening roller, thereby pressing the packing strap. This structure setting, through the pre-tightening torque of the torsion spring, ensures that the tightening wheel always applies basic pressure to the strap. This allows for dynamic adjustment of the contact pressure, avoids local wear, automatically adapts to different strap thicknesses, maintains stable clamping force, and also buffers impacts to protect mechanical parts.
[0020] 5. In the tightening and packing machine provided by this utility model, since a downward tension is applied to the tightening base when the tensioning wheel tightens, the tightening base is prone to breakage. Therefore, reinforcing ribs are added to the tightening base to make it more robust. By optimizing the mechanical distribution and enhancing local rigidity, the tensile strength and durability of the overall structure of the tightening base are significantly improved.
[0021] 6. The tightening and baling machine provided by this utility model adopts a multi-stage reduction transmission method using planetary gear sets and worm gears in its reduction mechanism. It has the advantages of simple structure, high transmission efficiency, and high output torque, and can achieve a large reduction ratio. In particular, by using the transmission structure design of planetary gear sets to expand the transmission ratio, the load of the drive motor can be adjusted to make its operation smoother, thereby increasing the mechanical output energy, achieving faster speed and greater torque, and maintaining good transmission efficiency and stability during use, thus greatly improving the working efficiency and stability of the tightening and baling machine. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] Figure 1 A three-dimensional structural diagram of the tightening and packing machine provided by this utility model;
[0024] Figure 2 This is a front view of the tightening and packing machine of this utility model;
[0025] Figure 3 This is a schematic cross-sectional view of the tightening and packing machine of this utility model. Figure 1 ;
[0026] Figure 4 This is a schematic cross-sectional view of the tightening and packing machine of this utility model. Figure 2 ;
[0027] Figure 5 This is a schematic diagram of the installation structure of the tensioning wheel and bearing housing of this utility model;
[0028] Figure 6 This is a schematic diagram of the structure of the tightening base of this utility model.
[0029] Explanation of reference numerals in the attached drawings: 1. Drive mechanism; 11. Coupling; 2. Reduction mechanism; 21. Worm; 22. Worm wheel; 23. Worm wheel shaft; 24. Limiting boss; 25. Reduction housing; 26. Central gear shaft; 27. Star gear set; 28. Positioning bearing; 3. Tensioning frame; 31. Side cover; 32. Connecting hole; 4. Tensioning wheel; 5. Tensioning base; 51. Base body; 52. Belt release plate; 53. Tensioning roller; 54. Reinforcing rib structure; 55. Round shaft part; 56. Guide hole; 57. Belt release handle; 6. One-way bearing; 7. Bearing box; 8. Torsion spring structure; 9. Support claw. Detailed Implementation
[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0034] Example
[0035] This embodiment provides, as follows: Figure 1-6The tightening and packing machine shown includes a drive mechanism 1, a reduction mechanism 2, and a tightening mechanism connected in sequence. The reduction mechanism 2 includes a worm gear 21 and a worm wheel 22 for transmitting torque between the drive mechanism 1 and the tightening mechanism. The tightening mechanism includes a tightening frame 3 and a tightening wheel 4 movably disposed relative to a tightening base 5. The worm wheel 22 has a worm wheel shaft 23 extending and rotatably disposed on the tightening frame 3. The tightening wheel 4 is linkedly disposed on the worm wheel shaft 23. The worm wheel 22 and the tightening wheel 4 are coaxially linked on the tightening frame 3 via the worm wheel shaft 23. A one-way bearing 6 is fixedly disposed between the worm wheel shaft 23 and the tightening frame 3 to limit the worm wheel shaft 23 to move in one direction.
[0036] The above-described implementation method is the core technical solution of this embodiment. Based on the fact that the worm gear 22 is coaxially linked with the tightening wheel 4 on the tightening frame 3 via the worm gear shaft 23, and the one-way bearing 6 is installed on the worm gear shaft 23, the rotation of the tightening wheel 4 and the worm gear 22 can be directly locked. Thus, even if there is backlash in the preceding multi-stage gears, the tightening wheel 4 cannot rotate because the one-way bearing 6 directly acts on the worm gear shaft at the end of the transmission chain, preventing reverse rotation and bypassing the influence of backlash in the intermediate transmission chain. This effectively prevents springback, improves the tightening effect and reliability. Furthermore, the one-way bearing is closer to the tightening wheel, resulting in a more direct and faster response, further enhancing the prevention of backlash. The tightening and packaging machine using this technical solution triggers mechanical locking the instant the tightening action stops, eliminating the possibility of backlash, thereby reducing springback, improving locking reliability, simplifying the structure, making the structure more compact, and facilitating maintenance. This helps reduce costs and improve product performance.
[0037] For further optimization settings, refer to Figure 3 and Figure 5 The tightening frame 3 has a bearing housing 7 fixedly installed inside. The bearing housing 7 has a bearing groove suitable for installing the one-way bearing 6. The worm gear shaft 23 has a limiting boss 24 that limits the one-way bearing 6 in the bearing groove. The bearing housing 7 has a through hole that connects to the bearing groove. One end of the worm gear shaft 23 passes through the one-way bearing 6 and the through hole and connects to the tightening wheel 4. The other end of the worm gear shaft 23 is rotatably connected to the tightening frame 3 through a positioning bearing 28. In this structure, the bearing housing 7 is embedded in the tightening frame 3 as an independent module. The bearing groove and the outer ring of the one-way bearing 6 are positioned and installed by interference fit. The worm gear shaft 23 limits the one-way bearing 6 in the bearing groove through the limiting boss 24 to achieve axial fixation of the one-way bearing 6. This installation design achieves high-precision positioning and rigid support for the one-way bearing, ensuring accurate installation, enhancing stability, extending service life, facilitating maintenance, and improving the anti-rebound effect through reliable positioning.
[0038] like Figure 3As shown, the worm gear 22 and the tightening wheel 4 are respectively located on both sides of the bearing housing 7. The bearing housing 7 and the tightening frame 3 are connected to form a first space suitable for accommodating the worm gear 22. The worm 21 extends into the first space and meshes with the worm gear 22. In addition, a side cover 31 opposite to the bearing housing 7 is installed on one side of the tightening frame 3. The side cover 31 and the bearing housing 7 form a second space suitable for accommodating the tightening wheel 4. This structural arrangement forms a double anti-rebound mechanism through "worm gear reduction and end one-way bearing". This retains the mechanical gain of worm gear transmission and eliminates the risk of self-locking failure through physical locking, thereby reducing rebound and improving locking reliability. The improved tightening and packing machine has a significantly improved anti-rebound torque and has important application value in the field of packaging machinery.
[0039] In summary, since the one-way bearing 6 is set on the worm gear shaft 23 at the end of the transmission chain and positioned in the bearing housing 7, it can reduce maintenance time compared to bearings deeply buried in the middle of the transmission chain. This bearing housing 7 and the tensioning frame 3 are connected by separate bolts to achieve modular maintainability design. As long as the bearing housing is removed from the tensioning frame, the one-way axial replacement operation can be performed. The installation structure is simple and convenient for inspection and replacement.
[0040] The following is combined Figure 1-3 , Figure 6 A detailed explanation of the specific structure of the tightening base is provided below:
[0041] The tightening base 5 includes a base body 51 and a strapping base plate 52 connected to one side of the bottom of the base body 51. The strapping base plate 52 is provided with a tightening roller 53 located below the tightening wheel 4, and the base body 51 is provided with a support claw 9 that cooperates with the strapping base plate 52. The support claw 9 fixes the strapping buckle when the tensioning wheel tightens the strapping, so that the strapping buckle can fix the strapping to achieve bundling. The tightening frame 3 is rotatably connected to the tightening base 5 via a connecting structure. The connecting structure includes connecting holes 32 respectively provided on the base body 51 and the tightening frame 3, and a rotating shaft passing through the connecting holes 32. A circular shaft portion 55 extending axially along the connecting holes 32 is provided on one side of the base body 51. The connecting holes 32 are provided through the circular shaft portion 55. A torsion spring structure 8 connecting the base body 51 and the tightening frame 3 is sleeved on the circular shaft portion 55. Specifically, one end of the torsion spring structure 8 abuts in the mounting hole on the side wall of the base body 51, and the other end abuts on the tightening frame 3. Under the action of the torsion spring structure 8, the tightening frame 3 has a tendency to drive the tightening wheel 4 to deflect towards the side closer to the tightening roller 53. As can be seen from the above structure, the function of the torsion spring is to bring the tightening wheel 4 close to the tightening roller 53, thereby pressing the strapping. The operation of the tightening frame can drive the tightening wheel 4 to rotate relative to the tightening base 5, realizing the pressing or loosening operation. This structural setting, through the pre-tightening torque of the torsion spring, ensures that the tightening wheel 4 always applies basic pressure to the strapping. This allows for dynamic adjustment of contact pressure, avoids local wear, automatically adapts to different strapping thicknesses, maintains stable clamping force, and also buffers impacts to protect mechanical parts.
[0042] Further optimized settings, such as Figure 6 As shown, the tightening base 5 also includes a guide hole 56 in the base body 51 through which the worm gear shaft 23 can pass, and a reinforcing rib structure 54 on the other side of the base body 51. This is because a downward tension is applied to the tightening base 5 when the tensioning wheel tightens, making the tightening base 5 prone to breakage. Therefore, a reinforcing rib is added to the tightening base 5 to make it more robust. By optimizing the mechanical distribution and enhancing local rigidity, the tensile strength and durability of the overall structure of the tightening base 5 are significantly improved. A belt release handle 57 is installed on the top of the base body 51. The bearing housing 7 has a circular protrusion with a bearing groove connected to the guide hole 56. When releasing the belt, simply lift the deceleration mechanism with the belt release handle 57 as the fulcrum, which simultaneously lifts the tightening frame 3 and the tightening wheel 4 together, thereby completing the belt release. This operation is more labor-saving.
[0043] In this embodiment, combined with Figure 1 and Figure 4As shown, the reduction mechanism 2 includes a reduction housing 25 with one end fixedly connected to the tensioning frame 3, a central gear shaft 26 rotatably disposed within the reduction housing 25, and a set of planetary gear assemblies connecting the central gear shaft 26 and the worm 21. The central gear shaft 26 is connected to the drive mechanism 1. The reduction housing 25 extends a predetermined length along the axial direction of the central gear shaft 26. The planetary gear assembly includes a planet carrier and multiple planetary gears disposed on the planet carrier and meshing with the central gear shaft 26, as well as an annular toothed belt disposed on the inner wall of the reduction housing 25 and cooperating with the planetary gears. The worm 21 is coaxially linked with the planet carrier. In a further preferred configuration, the drive mechanism 1 is a drive motor installed at the other end of the reduction housing 25. The drive motor is linked to the central gear shaft 26 via a coupling 11. Its working principle is as follows: when the drive motor rotates, it drives the central gear shaft 26 to rotate via the coupling 11. The central gear shaft 26 then engages with the planetary gear set to drive the planetary carrier to rotate. In turn, the planetary carrier drives the worm 21 and worm wheel 22 to rotate. When the worm wheel 22 rotates, it drives the tightening wheel 4 to rotate via the worm wheel shaft 23. The tightening wheel 4 applies gripping force to the packing strap through the teeth on its surface, thereby achieving tightening when the tightening wheel rotates. In summary, the reduction mechanism 2 of this tightening and baling machine adopts a multi-stage reduction transmission method using planetary gear sets and worm gears. It has the advantages of simple structure, high transmission efficiency, and high output torque, and can achieve a large reduction ratio. In particular, by using the transmission structure design of planetary gear sets to expand the transmission ratio, the load on the drive motor can be adjusted, making its operation smoother, thereby increasing the mechanical output energy, achieving faster speed and greater torque, and maintaining good transmission efficiency and stability during use. This significantly improves the working efficiency and stability of the tightening and baling machine to meet product usage requirements.
[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A tightening and packing machine, comprising a drive mechanism (1), a reduction mechanism (2), and a tightening mechanism connected in sequence, wherein the reduction mechanism (2) includes a worm gear (21) and a worm wheel (22) for transmitting torque between the drive mechanism (1) and the tightening mechanism, and the tightening mechanism includes a tightening frame (3) and a tightening wheel (4) movably disposed relative to a tightening base (5), characterized in that: The worm gear (22) has a worm gear shaft (23) that extends and rotatably mounts on the tensioning frame (3). The tensioning wheel (4) is linked to the worm gear shaft (23). The worm gear (22) and the tensioning wheel (4) are coaxially linked on the tensioning frame (3) via the worm gear shaft (23). A one-way bearing (6) is fixedly mounted between the worm gear shaft (23) and the tensioning frame (3) to limit the worm gear shaft (23) to move in one direction.
2. The tightening and packing machine according to claim 1, characterized in that: The tightening frame (3) is internally fixed with a bearing housing (7), the bearing housing (7) is provided with a bearing groove suitable for installing the one-way bearing (6), and the worm gear shaft (23) is provided with a limiting boss (24) that limits the one-way bearing (6) in the bearing groove.
3. The tightening and packing machine according to claim 2, characterized in that: The bearing housing (7) has a through hole that connects to the bearing groove. One end of the worm gear shaft (23) passes through the one-way bearing (6) and the through hole and is connected to the tightening wheel (4). The other end of the worm gear shaft (23) is rotatably connected to the tightening frame (3) through the positioning bearing (28).
4. The tightening and packing machine according to claim 3, characterized in that: The worm gear (22) and the tensioning wheel (4) are respectively located on both sides of the bearing housing (7). The bearing housing (7) and the tensioning frame (3) are connected to form a first space suitable for accommodating the worm gear (22). The worm (21) extends into the first space and meshes with the worm gear (22).
5. The tightening and packing machine according to claim 4, characterized in that: The tightening frame (3) has a side cover (31) installed on one side opposite to the bearing housing (7), and a second space suitable for accommodating the tightening wheel (4) is formed between the side cover (31) and the bearing housing (7).
6. The tightening and packing machine according to any one of claims 2-5, characterized in that: The tightening base (5) includes a base body (51) and a tape-laying base plate (52) connected to the bottom side of the base body (51). The tape-laying base plate (52) is provided with a tightening roller (53) located below the tightening wheel (4), and a support claw (9) that cooperates with the tape-laying base plate (52) is provided on the base body (51).
7. The tightening and packing machine according to claim 6, characterized in that: The tightening frame (3) is rotatably connected to the tightening base (5) through a connecting structure. The connecting structure includes connecting holes (32) respectively provided on the base body (51) and the tightening frame (3), and a rotating shaft passing through the connecting hole (32). A round shaft portion (55) extending axially along the connecting hole (32) is provided on one side of the base body (51). The connecting hole (32) passes through the round shaft portion (55). A torsion spring structure (8) is sleeved on the round shaft portion (55) and respectively connecting the base body (51) and the tightening frame (3). Under the action of the torsion spring structure (8), the tightening frame (3) has a tendency to drive the tightening wheel (4) to deflect towards the side closer to the tightening roller (53).
8. The tightening and packing machine according to claim 6, characterized in that: The tightening base (5) also includes a guide hole (56) provided in the base body (51) for the worm gear shaft (23) to pass through, and a reinforcing rib structure (54) provided on the other side of the base body (51). A loosening handle (57) is installed on the top of the base body (51). The bearing box (7) has a circular protrusion with a bearing groove connected in the guide hole (56).
9. The tightening and packing machine according to claim 1, characterized in that: The deceleration mechanism (2) includes a deceleration housing (25) with one end fixedly connected to the tensioning frame (3), a central gear shaft (26) rotatably disposed in the deceleration housing (25), and at least one set of planetary gear assemblies connecting the central gear shaft (26) and the worm gear (21). The central gear shaft (26) is connected to the drive mechanism (1), and the deceleration housing (25) extends a set length along the axial direction of the central gear shaft (26).
10. The tightening and packing machine according to claim 9, characterized in that: The drive mechanism (1) is a drive motor installed at the other end of the reduction housing (25), and the drive motor is linked to the central gear shaft (26) through a coupling (11).