A double-blade variable diameter mechanism

Abstract

This utility model discloses a double-blade variable diameter mechanism, including a blade shaft seat. A sliding shaft driven by a motor to move along the length direction is installed inside the blade shaft seat. Several sets of scissor-type extension components are symmetrically installed on both sides of the blade shaft seat. Each scissor-type extension component has a fixed shaft and a moving shaft. The fixed shaft is installed on the blade shaft seat, and the moving shaft is installed on the sliding shaft. A blade plate assembly is installed between the two symmetrical scissor-type extension components. The extension and retraction of the scissor-type extension components are driven by the motor through the sliding shaft, allowing for real-time adjustment of the rotation radius of the blade plate assembly. This enables rapid adaptation to the production of packaging bags of different lengths. When producing small-sized packaging bags, the symmetrical installation of two sets of blade plate assemblies achieves a single-turn rotation for two cuts, doubling the number of cuts per unit time and increasing the production capacity by one time compared to traditional single-blade mechanisms. For large-sized packaging bags, a single-blade mode can be flexibly switched to ensure cutting stability while accommodating diverse production needs.

Description

Technical Field

[0001] This utility model relates to a production line for packaging bags such as cement bags and chemical bags, and in particular to a double-blade variable diameter mechanism. Background Technology

[0002] In the production of packaging bags such as cement bags and chemical bags, paper rolls, as the core raw material, need to be processed into shape through multiple key processes such as gluing, cutting, and bag making. Among them, the cutting process directly determines the dimensional accuracy and production efficiency of the packaging bags, and is an important link affecting product quality and production efficiency.

[0003] In existing technologies, the cutting process typically relies on the rotational motion of a cutting tool mechanism. Its working principle is as follows: the cutter rotates with the mechanism, and after each cut, it must rotate one full revolution back to the initial cutting position before the next cut can be performed. The circumference of the cutter's rotation radius directly corresponds to the length of the packaging bag. However, this traditional cutting tool mechanism has significant technical limitations: on the one hand, because the radius of the cutting tool mechanism is fixed, when producing packaging bags of different sizes, the entire cutting tool mechanism needs to be replaced. This not only increases equipment adjustment time and labor costs but also reduces production flexibility and continuity. On the other hand, due to limitations such as the weight of the cutting tool mechanism and its structural stability, the rotational speed of the cutter cannot be significantly increased, resulting in low efficiency—only one cut can be completed per revolution—which restricts the overall production line's capacity improvement. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a double-blade variable diameter mechanism.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A double-blade variable diameter mechanism includes a blade shaft seat, in which a sliding shaft driven by a motor to move along the length direction is installed. Several sets of scissor extension assemblies are symmetrically installed on both sides of the blade shaft seat. Each scissor extension assembly is equipped with a fixed shaft and a moving shaft. The fixed shaft is installed on the blade shaft seat, and the moving shaft is installed on the sliding shaft. A blade plate assembly is installed between two symmetrical scissor extension assemblies.

[0007] The scissor extension assembly includes a first fixed rotating arm, a second fixed rotating arm, a first movable rotating arm, and a second movable rotating arm. One end of the first fixed rotating arm and the second fixed rotating arm are mounted on the cutter shaft seat via the fixed shaft. The other end of the first fixed rotating arm is mounted on the first movable rotating arm via the first hinge shaft. The other end of the second fixed rotating arm is mounted on the second movable rotating arm via the second hinge shaft. The first movable rotating arm and the second movable rotating arm are mounted on the sliding shaft via the movable shaft.

[0008] The first and second rotating arms extend outwards to have mounting portions, and the blade assembly is mounted on the end of the mounting portion.

[0009] The cutter shaft holder is provided with an elongated hole corresponding to the sliding trajectory of the moving shaft.

[0010] The blade assembly includes a support plate, on both sides of which are hinged along the length direction a plurality of arranged clips are mounted. The clips are U-shaped and their openings are clamped to the side of the support plate. A blade plate for mounting a cutting blade is detachably mounted between the top surface of the support plate and the clips. A slidable connecting rod is mounted on the bottom of the support plate, and a push block is mounted on the connecting rod corresponding to the opening of the clip. The clips are provided with an inclined surface corresponding to the push block.

[0011] One end of the connecting rod is equipped with a swing arm that rotates synchronously with the rotating nut. A guide wheel is installed at the end of the swing arm. The support plate has an end bearing installed at the same end of the swing arm. An "L"-shaped groove is provided on the end bearing. The guide wheel is movably installed in the "L"-shaped groove. A spring for resetting the connecting rod is installed at the other end of the support plate.

[0012] The "L"-shaped groove has a locking slot on its side wall along the length of the support plate.

[0013] The two symmetrical clips are connected at their bottoms by a tension spring.

[0014] The blade plate is provided with several mounting holes for accommodating different cutting blades.

[0015] The beneficial effects of this utility model are as follows: This utility model has a sliding shaft installed inside the cutter shaft seat, driven by a motor to move along the length direction. Several sets of scissor-type extension components are symmetrically installed on both sides of the cutter shaft seat. Each scissor-type extension component has a fixed shaft and a moving shaft. The fixed shaft is installed on the cutter shaft seat, and the moving shaft is installed on the sliding shaft. A blade assembly is installed between the two symmetrical scissor-type extension components. The extension and retraction of the scissor-type extension components are driven by the motor through the sliding shaft, allowing for real-time adjustment of the rotation radius of the blade assembly. This enables rapid adaptation to the production of packaging bags of different lengths. When producing small-sized packaging bags, the symmetrical installation of two sets of blade assemblies achieves a single-turn rotation for two cuts, doubling the number of cuts per unit time and increasing the production capacity by one time compared to traditional single-blade mechanisms. For large-sized packaging bags, a single-blade mode can be flexibly switched to ensure cutting stability while accommodating diverse production needs. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a structural diagram of the present invention;

[0018] Figure 2 This is an exploded view of the present invention;

[0019] Figure 3 This is one of the structural diagrams of a scissor-type extension assembly;

[0020] Figure 4 This is the second structural diagram of the scissor-type extension assembly;

[0021] Figure 5 This is one of the structural diagrams of the blade assembly;

[0022] Figure 6 This is the second structural diagram of the blade assembly;

[0023] Figure 7 This is an exploded view of the blade assembly;

[0024] Figure 8 This is a structural diagram of the clip;

[0025] Figure 9 This is a structural diagram of the end bearing component. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0027] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0028] The following describes some embodiments of the present invention with reference to the accompanying drawings.

[0029] Reference Figure 1-9A dual-blade variable-diameter mechanism includes a blade shaft seat 1. A sliding shaft 3, driven by a motor 2, moves along the length direction within the blade shaft seat 1. Several sets of scissor-type extension components 4 are symmetrically mounted on both sides of the blade shaft seat 1. Each scissor-type extension component 4 has a fixed shaft 5 and a moving shaft 6. The fixed shaft 5 is mounted on the blade shaft seat 1, and the moving shaft 6 is mounted on the sliding shaft 3. A blade plate assembly 7 is installed between the two symmetrical scissor-type extension components 4. The motor 2 drives the sliding shaft 3 to extend and retract the scissor-type extension components 4, allowing for real-time adjustment of the rotation radius of the blade plate assembly 7. This enables rapid adaptation to the production of packaging bags of different lengths. When producing small-sized packaging bags, the symmetrical installation of two sets of blade plate assemblies 7 achieves a single-turn rotation for two cuts, doubling the number of cuts per unit time and increasing the production capacity by one time compared to traditional single-blade mechanisms. For large-sized packaging bags, a single-blade mode can be flexibly switched to ensure cutting stability while accommodating diverse production needs.

[0030] Furthermore, the motor 2 uses a lead screw, lead screw nut, or other conventional transmission structure to drive the sliding shaft 3 to slide.

[0031] The scissor-type extension assembly 4 includes a first fixed rotating arm 8, a second fixed rotating arm 9, a first movable rotating arm 10, and a second movable rotating arm 11. One end of the first fixed rotating arm 8 and the second fixed rotating arm 9 are mounted on the cutter shaft seat 1 via the fixed shaft 5. The other end of the first fixed rotating arm 8 is mounted on the first movable rotating arm 10 via the first hinge shaft 35. The other end of the second fixed rotating arm 9 is mounted on the second movable rotating arm 11 via the second hinge shaft 36. The first movable rotating arm 10 and the second movable rotating arm 11 are mounted on the sliding shaft 3 via the movable shaft 6. By levering the principle, the movement stroke of the sliding shaft is amplified, realizing a wide range of radius adjustment for the cutter assembly. The structure is highly rigid and has excellent load-bearing capacity.

[0032] The first rotating arm 10 and the second rotating arm 11 extend outward to have mounting portions 12, and the blade assembly 7 is mounted on the end of the mounting portion 12.

[0033] Furthermore, the mounting part 12 is provided with a mounting hole 33, and the blade assembly 7 is provided with a mounting shaft 34 corresponding to the mounting hole 33, and the mounting shaft 34 is installed in the mounting hole 33.

[0034] The cutter shaft seat 1 is provided with an elongated hole 13 corresponding to the sliding trajectory of the moving shaft 6, which provides precise guiding constraint for the moving shaft 6, ensures that the trajectory is stable when the sliding shaft drives each moving arm to move, avoids deviation and jamming, and ensures the smooth extension and contraction of the scissor assembly.

[0035] The blade assembly 7 includes a support plate 14. Several arranged clips 15 are hinged to both sides of the support plate 14 along its length. Each clip 15 has a U-shaped structure, and its opening is clamped to the side of the support plate 14. A blade plate 17 for mounting a cutter 16 is detachably mounted between the top surface of the support plate 14 and the clips 15. A slidable connecting rod 18 is mounted on the bottom of the support plate 14, and a pusher is mounted on the connecting rod 18 corresponding to the opening of each clip 15. 19. The clamp 15 is provided with an inclined surface 20 corresponding to the push block 19. During installation, the blade 17 is inserted between the top surface of the support plate 14 and the clamp 15. Pulling the connecting rod 18 causes the push block 19 to slide along the inclined surface 20, causing the clamp 15 to rotate and thus pressing the blade 17 onto the support plate 14. During disassembly, pushing the connecting rod 18 to reset the clamp 15 allows the blade 17 to be easily pulled out without any external force applied. The operation is simple and convenient.

[0036] The bottom of the support plate 14 is provided with a sliding groove 29, and the connecting rod 18 is installed in the sliding groove 29. The sliding groove 29 is located at the position of the clamp 15 and has a notch 30 in the direction of the clamp 15. The two sides of the push block 19 extend into the notch 30, and the inclined surface 20 is located at the notch 30. Since the cutter 16 is facing the product, the bottom of the support plate 14 is suitable for installation on the machine. When assembled on the machine, only the bottom of the support plate 14 abuts against the installation position, and the entire push block 19 is hidden inside the support plate 14. The design of all components extending beyond the bottom of the support plate 14 can reduce the structure of the assembly surface and make installation more convenient.

[0037] One end of the connecting rod 18 is equipped with a swing arm 22 that rotates synchronously with the rotating nut 21. A guide wheel 23 is mounted at the end of the swing arm 22. The support plate 14 has an end bearing 24 mounted on the same end as the swing arm 22. An "L"-shaped groove 25 is provided on the end bearing 24, and the guide wheel 23 is movably mounted within the "L"-shaped groove 25. The other end of the support plate 14 is equipped with a spring 31 that resets the connecting rod 18. When a worker rotates the rotating nut 21 using a tool (such as a wrench), the swing arm 22 rotates synchronously, causing the guide wheel 23 to rotate around the rotating nut. When the guide wheel 23 rolls relative to the nut within the "L"-shaped groove 25, the swing arm 22 moves accordingly (simultaneously). The spring 31 will be further compressed. After the movement is completed, the length direction of the swing arm 22 is consistent with the stretching direction of the spring 31. The rotating nut 21 is moved outward, thereby pushing out the connecting rod 18. At this time, the push block 19 moves towards the clamp 15 and slides along the inclined plane 20, causing the clamp 15 to rotate, thereby pressing the blade plate 17 onto the support plate 14, thus completing the installation of the blade plate 17. When the worker rotates the rotating nut 21 in the opposite direction, the length direction of the swing arm 22 forms an angle with the stretching direction of the spring 31, and the spring 31 can pull the connecting rod 18 to reset. At this time, the blade plate 17 can be pulled out.

[0038] The L-shaped groove 25 has a slot 26 on the side wall along the length of the support plate 14. After the blade plate 17 is installed, the guide wheel 23 is inserted into the slot 26 to limit the movement and prevent it from being released automatically.

[0039] The two symmetrical clips 15 are connected at their bottoms by a tension spring 27. When the blade plate 17 is not inserted, the tension spring 27 pulls the clips 15 tight, causing the clips 15 to tend to move away from the top surface of the support plate 14. This keeps the distance between the clips 15 and the top surface of the support plate 14 at its maximum, making it easier to insert the blade plate 17.

[0040] The support plate 14 has several hinge seats 32 arranged along its length on both sides, and the clip 15 is hingedly installed in the hinge seats 32.

[0041] The blade plate 17 is provided with a number of mounting holes 28 for adapting to different cutting blades, which can accommodate the installation needs of cutting blades of different specifications and types, expand the applicability of the mechanism, eliminate the need to customize blade plates for different cutting blades, and reduce equipment adaptation costs.

[0042] In this invention, the term "multiple" refers to two or more items unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A double-blade variable diameter mechanism, comprising a blade shaft seat (1), characterized in that... The cutter shaft seat (1) is equipped with a sliding shaft (3) that is driven by a motor (2) to move along the length direction. Several sets of scissor extension assemblies (4) are symmetrically installed on both sides of the cutter shaft seat (1). The scissor extension assembly (4) is equipped with a fixed shaft (5) and a moving shaft (6). The fixed shaft (5) is installed on the cutter shaft seat (1), and the moving shaft (6) is installed on the sliding shaft (3). A blade assembly (7) is installed between the two symmetrical scissor extension assemblies (4).

2. The dual-knife variable-diameter mechanism of claim 1, wherein The scissor extension assembly (4) includes a first fixed rotating arm (8), a second fixed rotating arm (9), a first movable rotating arm (10), and a second movable rotating arm (11). One end of the first fixed rotating arm (8) and the second fixed rotating arm (9) are mounted on the cutter shaft seat (1) via the fixed shaft (5). The other end of the first fixed rotating arm (8) is mounted on the first movable rotating arm (10) via the first hinge shaft. The other end of the second fixed rotating arm (9) is mounted on the second movable rotating arm (11) via the second hinge shaft. The first movable rotating arm (10) and the second movable rotating arm (11) are mounted on the sliding shaft (3) via the movable shaft (6).

3. The dual-knife variable-diameter mechanism of claim 2, wherein The first rotating arm (10) and the second rotating arm (11) have mounting portions (12) extending outward, and the blade assembly (7) is mounted on the end of the mounting portion (12).

4. The dual knife reaming mechanism of claim 2, wherein The cutter shaft seat (1) is provided with an elongated hole (13) corresponding to the sliding trajectory of the moving shaft (6).

5. The dual knife reaming mechanism of claim 1, wherein The blade assembly (7) includes a support plate (14). Several clamps (15) are hinged to both sides of the support plate (14) along the length direction. The clamps (15) are U-shaped. The openings of the clamps (15) are clamped to the side of the support plate (14). A blade plate (17) for mounting a cutter (16) is detachably installed between the top surface of the support plate (14) and the clamps (15). A slidable connecting rod (18) is installed at the bottom of the support plate (14). A push block (19) is installed on the connecting rod (18) corresponding to the opening of the clamp (15). The clamps (15) are provided with an inclined surface (20) corresponding to the push block (19).

6. The dual-knife variable-diameter mechanism of claim 5, wherein One end of the connecting rod (18) is equipped with a swing arm (22) that rotates synchronously with the rotating nut (21). A guide wheel (23) is installed at the end of the swing arm (22). The support plate (14) is located at the same end of the swing arm (22) and has an end bearing (24) installed thereon. An "L"-shaped groove (25) is provided on the end bearing (24). The guide wheel (23) is movably installed in the "L"-shaped groove (25). A spring (31) for resetting the connecting rod (18) is installed at the other end of the support plate (14).

7. The dual-knife variable-diameter mechanism of claim 6, wherein A slot (26) is provided on the side wall of the "L"-shaped groove (25) in the length direction of the support plate (14).

8. The dual knife reaming mechanism of claim 5, wherein The bottoms of the two symmetrical clips (15) are connected by a tension spring (27).

9. The dual knife reaming mechanism of claim 5, wherein The blade plate (17) is provided with a number of mounting holes (28) for adapting to different cutting blades.

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