Straw bending and shaping device and bending method

Abstract

The invention discloses a straw bending and shaping device and a bending method, and relates to the field of automatic assembly. The device comprises a rack, and a straw clamping device, a hot air softening assembly, an upper shaping assembly and a lower bending assembly are arranged on the rack, wherein the upper shaping assembly and the lower bending assembly are located on the two sides of a straw. The hot air softening assembly softens the bent part of the straw; the upper shaping assembly comprises a first guide rail system, a positioning comb plate and an arc-shaped shaping plate, and can be movably positioned and cooperatively shaped; the lower bending assembly comprises a second guide rail system, a cam installation base, a V-shaped cam and the like, the suction pipe is bent through rotation of the V-shaped cam, and a cooling air pipe is further arranged for shaping. The method comprises the steps of hot air softening, positioning, clamping, bending, cooling and returning. According to the device and method, the straw bending efficiency can be improved, the shaping stability is guaranteed, and springback is reduced.

Description

Technical Field

[0001] This invention relates to automated assembly, specifically to a straw bending and shaping device and bending method. Background Technology

[0002] In the straw manufacturing industry, some products (such as nozzles with straws) require the straws to be bent at specific angles. Currently, traditional straw bending processes have significant shortcomings: firstly, the plastic stability of the bent product is poor, and the straw is prone to springback due to material properties, resulting in bending angles that do not meet design requirements and affecting product quality; secondly, existing equipment mostly bends individual straws one by one, making batch processing impossible and resulting in low production efficiency, which is insufficient to meet the needs of large-scale production. Furthermore, the traditional bending process suffers from insufficient straw positioning accuracy, easily leading to displacement and further exacerbating the problem of poor product consistency. These defects limit the improvement of straw bending quality and efficiency, necessitating a more reliable and efficient technical solution. Summary of the Invention

[0003] The present invention provides a straw bending and shaping device, the straw bending and shaping device includes a frame, a straw clamping device is provided on the frame, a straw is clamped and fixed on the straw clamping device, the frame straw bending and shaping device includes a hot air softening component and an upper shaping component and a lower bending component located on both sides of the straw;

[0004] The hot air softening component is used to blow hot air onto the bend of the straw to soften it.

[0005] The upper shaping component includes a first guide rail system, a positioning comb plate, and an arc-shaped shaping plate. The positioning comb plate and the arc-shaped shaping plate are installed on the front and rear sides of the end of the first guide rail system. The first guide rail system drives the positioning comb plate and the arc-shaped shaping plate to move towards the suction tube. The positioning comb plate is provided with a positioning groove with an opening facing the suction tube.

[0006] The lower bending assembly includes a second guide rail system, a cam mounting seat, a "V"-shaped cam, and a cam drive mechanism. The second guide rail system is equipped with a liftable cam mounting seat, on which a "V"-shaped cam is rotatably mounted. The rotation axis of the "V"-shaped cam is located at the intersection point and rotates back and forth along the length of the straw. Both ends of the opening of the "V"-shaped cam are coaxially mounted with shaping rollers distributed along the length of the straw. The cam drive mechanism drives the cam mounting seat to move up and down. The straw and the arc-shaped shaping plate apply force to the two shaping rollers, causing the "V"-shaped cam to rotate around the rotation axis, thereby bending the straw.

[0007] Furthermore, the first guide rail system is a two-axis guide rail, comprising a first transverse guide rail and a longitudinal guide rail;

[0008] The first transverse guide rail is mounted on the frame, and the longitudinal guide rail is slidably mounted on the first transverse guide rail. A first transverse driver for driving the longitudinal guide rail to move laterally is provided on the frame.

[0009] The longitudinal guide rail includes a sliding seat, a longitudinal slide rail, and a longitudinal driver. The sliding seat is slidably mounted on the first transverse guide rail and connected to the first transverse driver. The longitudinal slide rail is longitudinally slidably engaged with the sliding seat. The longitudinal driver drives the longitudinal slide rail to move closer to or further away from the straw in the longitudinal direction.

[0010] The longitudinal slide rail is equipped with an adapter seat for installing the positioning comb plate and the arc-shaped shaping plate. The arc-shaped shaping plate is located on the side of the positioning comb plate away from the suction tube clamping device, and the side of the arc-shaped shaping plate away from the positioning comb plate has an outer arc surface that is equivalent to the bending amplitude of the suction tube.

[0011] Furthermore, the curved molding plate can be detachably installed at the end of the longitudinal slide rail.

[0012] Furthermore, a row of straws is clamped and fixed on the straw clamping device;

[0013] A pair of "V"-shaped cams are installed parallel to each other on the cam mounting base. The pair of "V"-shaped cams are fixedly connected by multiple connecting rods. Several pairs of shaping rollers are installed on the two connecting rods connected to the two ends of the "V"-shaped cams.

[0014] The positioning comb plate has a row of nipple-shaped positioning grooves. The external opening of the positioning groove is a conical opening, and the internal part of the positioning groove is a vertical strip groove.

[0015] Furthermore, the second guide rail system is a two-stage transverse guide rail consisting of a second transverse guide rail and a third transverse guide rail. The second transverse guide rail is fixedly mounted on the frame, and the third transverse guide rail is slidably mounted on the second transverse guide rail. The second transverse guide rail is equipped with a second transverse drive for driving the third transverse guide rail to move laterally.

[0016] A cam drive mechanism for driving the "V"-shaped cam is installed on the third transverse guide rail.

[0017] Furthermore, the cam mounting base includes a base and a lifting seat that slides vertically with the base. The bottom of the lifting seat is provided with lifting rollers, and a "V"-shaped cam is rotatably mounted on the top of the lifting seat.

[0018] The cam drive mechanism includes a guide push block and a push block driver. The guide push block is laterally slidably mounted on the third transverse guide rail. The guide push block has a ramp surface that slides with the lifting roller. The other side is connected to the push block driver. The push block driver pushes the guide push block to move laterally, and the guide push block drives the lifting seat to rise.

[0019] Furthermore, the shaping roller is a grooved roller, and the grooves on the surface of the grooved roller at both ends of the "V"-shaped cam are used to accommodate a straw;

[0020] The lower bending assembly also includes a cooling duct, which is used to blow air onto the bend of the suction tube to cool and shape it.

[0021] Furthermore, a return spring is connected between each "V"-shaped cam and the cam mounting base;

[0022] A support wire is fixed to the cam mounting base, located at the bottom of the straw and perpendicular to the straw.

[0023] A straw bending method based on the straw bending and shaping device, the method comprising the following steps:

[0024] S1. Hot air is blown onto the bend of the straw through the hot air softening component to soften the straw.

[0025] S2. The first guide rail system drives the positioning comb plate and the arc-shaped shaping plate to move towards the straw, so that the straw is stuck in the positioning groove of the positioning comb plate.

[0026] S3. The cam mounting seat moves laterally towards the bend of the straw in the second guide rail system until the "V" shaped cam approaches the first shaping roller of the straw clamping device and contacts the arc-shaped shaping plate, clamping the straw between the first shaping roller and the arc-shaped shaping plate.

[0027] S4. The cam drive mechanism drives the cam mounting seat to lift and lower to raise the height of the "V" shaped cam. The two shaping rollers of the "V" shaped cam are subjected to the force from the straw and the arc shaping plate, causing the "V" shaped cam to rotate around the rotation axis in the direction of the straw clamping device, so as to bend the straw between the first shaping roller, the second shaping roller and the arc shaping plate backward and upward.

[0028] S5. The upper shaping component and the lower bending component are put into place.

[0029] Furthermore, step S4 also includes:

[0030] During or after bending the straw, cool the bent part of the straw with a blower.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. By setting up a hot air softening component to heat the straw before bending, the straw material is brought to a suitable plastic state. Combined with the cooperation of the arc-shaped shaping plate and the "V"-shaped cam, the bending and forming are stable and springback is avoided.

[0033] 2. A positioning comb plate with a nipple-shaped positioning groove is used for precise positioning. The external conical opening facilitates the introduction of the straw, while the internal vertical strip groove can effectively limit the straw and prevent it from shifting during bending, thereby improving bending accuracy.

[0034] 3. The curved molding plate adopts a detachable installation structure, which can quickly replace molding plates with different curvatures according to different product requirements without adjusting the entire device structure, thus improving the adaptability and flexibility of the device.

[0035] 4. The two-axis guide rails of the upper shaping component are combined with the two-stage transverse guide rails of the lower bending component to achieve precise movement and positioning in multiple directions, making the bending action smoother and the bending position and amplitude control more precise.

[0036] 5. The straw clamping device can clamp multiple straws at once. With a pair of "V" shaped cams and a multi-link structure, it can complete the bending operation of multiple straws simultaneously, significantly improving production efficiency.

[0037] 6. The lower bending assembly is equipped with a cooling air duct, which can cool the bending part with cold air immediately during or after bending, so that the suction tube can be quickly shaped and prevent deformation caused by thermal rebound.

[0038] 7. Each "V"-shaped cam is equipped with a return spring between itself and the cam mounting base. After bending, it can automatically return to its initial position, achieving automatic reset, reducing manual intervention, and facilitating continuous operation.

[0039] 8. A support wire is provided on the cam mounting base to provide bottom support for the straw during the heating and softening process, prevent the straw from sagging, and ensure the consistency of the bending shape. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a diagram showing the straw before and after bending.

[0042] Figure 2 This is a perspective view of a straw bending and shaping device according to the present invention;

[0043] Figure 3 This is a side view of the straw bending and shaping device of the present invention;

[0044] Figure 4 A three-dimensional view of the positioning comb plate and the curved shaping plate;

[0045] Figure 5 This is a front view of the positioning comb plate;

[0046] Figure 6 Side view of the positioning comb plate and the curved shaping plate;

[0047] Figure 7 A three-dimensional view of a "V"-shaped cam;

[0048] Figure 8 A schematic diagram of the rotation of a "V"-shaped cam;

[0049] Figure 9 This is a perspective view of a straw bending and shaping device according to the present invention;

[0050] Figure 10 A schematic diagram of the principle of a cam drive mechanism driving a "V" shaped cam for lifting;

[0051] Figures 11a-11e This is a process diagram illustrating the bending of a straw using the straw bending and shaping device of the present invention.

[0052] Figure 11a This is a schematic diagram of heating the bent part of the straw;

[0053] Figure 11b This is a schematic diagram showing the upper shaping component moving downwards to insert the straw;

[0054] Figure 11c This is a schematic diagram of the "V"-shaped cam of the downward bending assembly lifting upwards;

[0055] Figure 11d A schematic diagram showing the rotation of a "V"-shaped cam and its bending of the straw;

[0056] Figure 11e This is a schematic diagram showing the upper shaping component and the lower bending component leaving the straw.

[0057] Explanation of reference numerals in the attached figures:

[0058] 100 - Frame, 210 - Suction tube, 220 - Nozzle;

[0059] 300 - Upper shaping component; 310 - First guide rail system; 311 - First transverse guide rail; 312 - Longitudinal guide rail; 313 - First transverse actuator; 314 - Sliding seat; 315 - Longitudinal slide rail; 316 - Longitudinal actuator; 317 - Adapter seat; 320 - Positioning comb plate; 321 - Positioning groove; 322 - Conical opening; 323 - Vertical strip groove; 330 - Arc-shaped shaping plate;

[0060] 400 - Downward bending assembly, 410 - Second guide rail system, 411 - Second transverse guide rail, 412 - Third transverse guide rail, 413 - Second transverse drive, 415 - Cam drive mechanism, 416 - Guide push block, 417 - Push block drive, 420 - Cam mounting seat, 421 - Reset spring, 4211 - Base, 4212 - Lifting seat, 4213 - Lifting roller, 422 - Support wire, 430 - "V" shaped cam, 431 - Shaping roller, 4311 - First shaping roller, 4312 - Second shaping roller, 433 - Connecting rod, 450 - Cooling duct. Detailed Implementation

[0061] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0062] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution of this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0063] Reference Figure 2-10 As shown, this invention provides a straw bending and shaping device, which includes a frame 100, on which a straw clamping device (not shown) is provided for fixing the straw. The straw clamping device clamps and fixes... Figure 1 The nozzle 220 shown has a straw 210; in another embodiment, if the nozzle is not needed, the straw itself can be clamped directly to accommodate different straw shapes. At the same time, the frame 100 also integrates a hot air softening component (not shown in the figure), as well as an upper shaping component 300 and a lower bending component 400 located on both sides of the straw 210, which together complete the bending and shaping operation of the straw.

[0064] The hot air softening component (not shown in the figure) is used to heat the bend of the straw 210 with hot air (the heating part is as follows). Figure 11a As shown in the diagram, the straw material is softened to facilitate subsequent bending and shaping. Hot air is blown through the air outlet to the part of the straw that needs to be bent, using heat to change the physical properties of the straw material, making it bendable and laying the foundation for subsequent shaping steps.

[0065] Upper shaping component 300

[0066] The upper shaping component 300 consists of a first guide rail system 310, a positioning comb plate 320, and an arc-shaped shaping plate 330. The first guide rail system 310 provides a moving path and power for the positioning comb plate 320 and the arc-shaped shaping plate 330, enabling them to move towards the straw 210. The positioning comb plate 320 has a positioning groove 321 with its opening facing the straw 210. When it moves to the straw, the positioning groove 321 can position and fix the straw, preventing it from shifting during bending. The arc-shaped shaping plate 330 is used to cooperate with the lower bending component to shape the straw, ensuring that the shape after bending meets the requirements.

[0067] In an alternative embodiment, such as Figure 2-3 As shown, the first guide rail system 310 is a two-axis guide rail, consisting of a first transverse guide rail 311 and a longitudinal guide rail 312. The first transverse guide rail 311 is mounted on the frame 100, serving as the moving base for the longitudinal guide rail 312; the longitudinal guide rail 312 is slidably mounted on the first transverse guide rail 311, and the first transverse driver 313 on the frame 100 is responsible for driving the longitudinal guide rail 312 to move laterally. The longitudinal guide rail 312 further includes a sliding seat 314, a longitudinal slide rail 315, and a longitudinal driver 316. The sliding seat 314 is slidably engaged with the first transverse guide rail 311 and connected to the first transverse driver 313. The longitudinal slide rail 315 is longitudinally slidably engaged with the sliding seat 314. Driven by the longitudinal driver 316, the longitudinal slide rail 315 can move closer to or further away from the suction tube 210 in the longitudinal direction, thereby realizing the movement and adjustment of the positioning comb plate 320 and the arc-shaped shaping plate 330 in the two-dimensional direction.

[0068] In an optional embodiment, the curved shaping plate 330 is detachably mounted at the end of the longitudinal slide rail 315. When different degrees of bending are required for the straw, the operator can easily replace the curved shaping plate 330 with the corresponding curvature without adjusting the entire upper shaping assembly. This greatly improves the adaptability of the device to different bending requirements and enhances the flexibility and practicality of the equipment.

[0069] The longitudinal slide rail 315 has an adapter 317 at its end, which is mainly used to install the positioning comb plate 320 and the arc-shaped shaping plate 330, serving as a connection and fixation mechanism. The arc-shaped shaping plate 330 is located on the side of the positioning comb plate 320 away from the straw clamping device. The side of the arc-shaped shaping plate 330 away from the positioning comb plate 320 has an outer arc surface. The curvature of this outer arc surface is approximately the same as the bending radius required for the straw 210. During the bending process, the straw will deform along this outer arc surface to form the required curved shape.

[0070] Downward bending component 400

[0071] The lower bending assembly includes a second guide rail system 410, a cam mounting seat 420, a "V"-shaped cam 430, a cam drive mechanism 415, and a cooling duct 450. The second guide rail system 410 is equipped with a liftable cam mounting seat 420, and a "V"-shaped cam 430 is rotatably mounted on the cam mounting seat 420. The rotation axis of the "V"-shaped cam 430 is located at the intersection and rotates back and forth along the length of the straw. Both ends of the opening of the "V"-shaped cam 430 are coaxially mounted with shaping rollers 431 distributed along the length of the straw. The cam drive mechanism 415 drives the cam mounting seat 420 to move up and down. The straw 210 and the arc-shaped shaping plate 330 apply force to the two shaping rollers 431, causing the "V"-shaped cam 430 to rotate around the rotation axis to bend the straw.

[0072] The cooling duct 450 blows air onto the suction tube after bending, so that the suction tube can be cooled and shaped quickly, maintaining the shape after bending.

[0073] In an alternative embodiment, such as Figure 2 As shown, the second guide rail system 410 is a two-stage transverse guide rail system consisting of a second transverse guide rail 411 and a third transverse guide rail 412. The second transverse guide rail 411 is fixedly mounted on the frame 100, and the third transverse guide rail 412 is slidably mounted on the second transverse guide rail 411. The second transverse drive 413 configured on the second transverse guide rail 411 can drive the third transverse guide rail 412 to move laterally. This two-stage transverse guide rail design allows for more precise control of the position of the "V"-shaped cam 430, ensuring the accuracy of the bending operation.

[0074] In an alternative embodiment, such as Figure 10 As shown, the cam mounting base 420 includes a base 4211 and a lifting seat 4212 that slides vertically with the base. The bottom of the lifting seat 4212 is provided with a lifting roller 4213, and a "V"-shaped cam 430 is rotatably mounted on the top of the lifting seat 4212. The cam drive mechanism 415 is mounted on the third transverse guide rail 412. The cam drive mechanism 415 consists of a guide push block 416 and a push block driver 417. The guide push block 416 is slidably mounted laterally on the third transverse guide rail 412. The guide push block 416 is provided with a ramp surface that slides with the lifting roller 4213. The other side is connected to the push block driver 417. The push block driver 417 pushes the guide push block 416 to move laterally, and the guide push block 416 drives the lifting seat 4212 and the "V"-shaped cam 430 on its top to rise.

[0075] In an optional embodiment, the shaping roller 431 is a grooved roller with grooves on its surface. The groove dimensions on the surfaces of the grooved rollers at both ends of the "V"-shaped cam 430 match those of a straw 210, just enough to accommodate the straw. During bending, the straw is embedded in the grooves. The design of the grooved rollers not only limits the straw, preventing it from detaching during bending, but also reduces friction between the rollers and the straw through its own rotation, avoiding damage to the straw surface.

[0076] In an optional embodiment, a return spring 421 is connected between each "V"-shaped cam 430 and the cam mount 420, such as... Figure 7 As shown. The reset spring 421 is elastic. When the guide push block 416 leaves the "V"-shaped cam 430, it no longer applies force to the "V"-shaped cam 430. At this time, the reset spring 421 will generate tension, pulling the "V"-shaped cam 430 back to the initial position, preparing for the next bending operation, and ensuring the continuity and stability of the device operation.

[0077] In this invention, to improve work efficiency, a row of straws 210 can be clamped and fixed on the straw clamping device. Correspondingly, a pair of "V"-shaped cams 430 are installed parallel to each other on the cam mounting base 420. The pair of "V"-shaped cams 430 are fixedly connected by three connecting rods 433. The three connecting rods 433 are respectively connected between the three ends of the "V"-shaped cams 430. Several pairs of plastic rollers 431 are respectively installed on the two connecting rods 433 connected to the two ends of the opening of the "V"-shaped cams 430. Preferably, one end of the reset spring 421 is connected to one of the connecting rods 433 to drive the "V"-shaped cams 430 to reset.

[0078] The positioning comb plate 320 has a row of nipple-shaped positioning grooves 321. This structural design allows the device to bend multiple straws at once, greatly improving production efficiency. The external opening of the nipple-shaped positioning groove 321 is a conical opening 322, which guides the straw and facilitates its entry into the positioning groove. The internal part of the positioning groove 321 is a vertical strip groove 323, which firmly holds the straw in place, effectively preventing it from shifting during the bending process.

[0079] A support wire 422 is installed on the cam mounting seat 420. The cam mounting seat 420 is perpendicular to the straw and overlaps the bottom of the straw to provide bottom support for the straw and prevent the straw from drooping after being heated and softened, which would affect the subsequent bending process.

[0080] The bending steps of the present invention will be further explained below:

[0081] S1. The straw is clamped using the straw bending and shaping device. Then, the hot air softening component is activated to blow hot air onto the bending portion of the straw 210, such as... Figure 11a As shown. The purpose of the hot air is to soften the material at the bend of the straw 210, making it bendable so that subsequent bending and shaping operations can be carried out smoothly. During the hot air blowing process, it is necessary to control the temperature and blowing time of the hot air to ensure that the straw is softened to a suitable degree without being damaged by overheating.

[0082] S2. After the hot air softening is complete, the first guide rail system 310 drives the positioning comb plate 320 and the arc-shaped shaping plate 330 to move towards the straw 210. During the movement, the positioning groove 321 on the positioning comb plate 320 gradually approaches the straw, eventually causing the straw 210 to be stuck in the positioning groove 321. Figure 11b As shown, the positioning groove 321 positions and fixes the straw, preventing it from shifting position during subsequent bending and ensuring accurate bending operations.

[0083] S3. After positioning, the cam mounting base 420 moves laterally towards the bend of the straw 210 under the drive of the second guide rail system 410. As the cam mounting base 420 moves, the "V"-shaped cam 430 also gradually approaches the straw. Until the first shaping roller 4311 on the left side of the "V"-shaped cam 430 contacts the arc-shaped shaping plate 330, as... Figure 11c As shown. At this time, the straw 210 is clamped between the first shaping roller 4311 and the arc-shaped shaping plate 330, providing a stable clamping point for subsequent bending operations.

[0084] S4. After the first shaping roller 4311 clamps the straw, the pusher driver 417 drives the guide pusher 416 to move laterally to the left. The inclined surface of the guide pusher 416 cooperates with the lifting roller 4213 of the lifting seat 4212, causing the lifting seat 4212 and the "V"-shaped cam 430 to move upward. The two shaping rollers 431 of the "V"-shaped cam 430 are subjected to forces from the straw 210 and the arc-shaped shaping plate 330, causing the "V"-shaped cam 430 to rotate around the rotation axis in the direction of the straw clamping device. Figure 11d As shown. In this process, the first shaping roller 4311, the second shaping roller 4312, and the arc-shaped shaping plate 330 cooperate to bend the straw located between them backward and upward to form the desired bending shape. At the same time as bending, the cooling air duct 450 starts blowing air, and the cold air quickly cools the straw 210, thereby fixing its bent state and ensuring that the bent shape can be stably maintained.

[0085] S5. After the straw has cooled and set, the upper shaping component 300 and the lower bending component 400 begin to return to their original positions. Figure 11eAs shown. The upper shaping component 300 moves away from the straw under the drive of the first guide rail system 310 and returns to its initial position; the lower bending component 400 also returns to its initial position under the drive of the second guide rail system 410. After all components are in place, the entire bending and shaping operation is completed, and the device is ready to perform the next straw bending process.

[0086] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A straw bending and shaping device, comprising a frame, a straw clamping device on the frame, and a straw clamped and fixed thereon, characterized in that, The frame suction tube bending and shaping device includes a hot air softening component and an upper shaping component and a lower bending component located on both sides of the suction tube. The hot air softening component is used to blow hot air onto the bend of the straw to soften it. The upper shaping component includes a first guide rail system, a positioning comb plate, and an arc-shaped shaping plate. The positioning comb plate and the arc-shaped shaping plate are installed on the front and rear sides of the end of the first guide rail system. The first guide rail system drives the positioning comb plate and the arc-shaped shaping plate to move towards the suction tube. The positioning comb plate is provided with a positioning groove with an opening facing the suction tube. The lower bending assembly includes a second guide rail system, a cam mounting seat, a "V"-shaped cam, and a cam drive mechanism. The second guide rail system is equipped with a liftable cam mounting seat, on which a "V"-shaped cam is rotatably mounted. The rotation axis of the "V"-shaped cam is located at the intersection point and rotates back and forth along the length of the straw. Both ends of the opening of the "V"-shaped cam are coaxially mounted with shaping rollers distributed along the length of the straw. The cam drive mechanism drives the cam mounting seat to move up and down. The straw and the arc-shaped shaping plate apply force to the two shaping rollers, causing the "V"-shaped cam to rotate around the rotation axis to bend the straw.

2. The straw bending and shaping device as described in claim 1, characterized in that, The first guide rail system is a two-axis guide rail, which includes a first transverse guide rail and a longitudinal guide rail; The first transverse guide rail is mounted on the frame, and the longitudinal guide rail is slidably mounted on the first transverse guide rail. A first transverse driver for driving the longitudinal guide rail to move laterally is provided on the frame. The longitudinal guide rail includes a sliding seat, a longitudinal slide rail, and a longitudinal driver. The sliding seat is slidably mounted on the first transverse guide rail and connected to the first transverse driver. The longitudinal slide rail is longitudinally slidably engaged with the sliding seat. The longitudinal driver drives the longitudinal slide rail to move closer to or further away from the straw in the longitudinal direction. The longitudinal slide rail is equipped with an adapter seat for installing the positioning comb plate and the arc-shaped shaping plate. The arc-shaped shaping plate is located on the side of the positioning comb plate away from the suction tube clamping device, and the side of the arc-shaped shaping plate away from the positioning comb plate has an outer arc surface that is equivalent to the bending amplitude of the suction tube.

3. The straw bending and shaping device as described in claim 2, characterized in that, The curved molding plate can be detachably installed at the end of the longitudinal slide rail.

4. The straw bending and shaping device as described in claim 1, characterized in that, A row of straws is clamped and fixed on the straw clamping device; A pair of "V"-shaped cams are installed parallel to each other on the cam mounting base. The pair of "V"-shaped cams are fixedly connected by multiple connecting rods. Several pairs of shaping rollers are installed on the two connecting rods connected to the two ends of the "V"-shaped cams. The positioning comb plate has a row of nipple-shaped positioning grooves. The external opening of the positioning groove is a conical opening, and the internal part of the positioning groove is a vertical strip groove.

5. The straw bending and shaping device as described in claim 1, characterized in that, The second guide rail system is a two-stage transverse guide rail consisting of a second transverse guide rail and a third transverse guide rail. The second transverse guide rail is fixedly mounted on the frame, and the third transverse guide rail is slidably mounted on the second transverse guide rail. The second transverse guide rail is equipped with a second transverse drive for driving the third transverse guide rail to move laterally. A cam drive mechanism for driving the "V"-shaped cam is mounted on the third transverse guide rail.

6. The straw bending and shaping device as described in claim 5, characterized in that, The cam mounting base includes a base and a lifting seat that slides vertically with the base. The bottom of the lifting seat is equipped with lifting rollers, and a "V"-shaped cam is rotatably mounted on the top of the lifting seat. The cam drive mechanism includes a guide push block and a push block driver. The guide push block is laterally slidably mounted on the third transverse guide rail. The guide push block has a ramp surface that slides with the lifting roller. The other side is connected to the push block driver. The push block driver pushes the guide push block to move laterally, and the guide push block drives the lifting seat to rise.

7. The straw bending and shaping device as described in claim 1, characterized in that, The shaping roller is a grooved roller, and the grooves on the surface of the grooved roller at both ends of the "V"-shaped cam are used to accommodate a straw; The lower bending assembly also includes a cooling duct, which is used to blow air onto the bend of the suction tube to cool and shape it.

8. The straw bending and shaping device as described in claim 1, characterized in that, Each "V"-shaped cam is connected to the cam mount with a return spring; A support wire is fixed on the cam mounting base, located at the bottom of the straw and perpendicular to the straw.

9. The straw bending method of the straw bending and shaping device according to any one of claims 1-8, characterized in that, The method includes the following steps: S1. Hot air is blown onto the bend of the straw through the hot air softening component to soften the straw. S2. The first guide rail system drives the positioning comb plate and the arc-shaped shaping plate to move towards the straw, so that the straw is stuck in the positioning groove of the positioning comb plate. S3. The cam mounting seat moves laterally towards the straw bend in the second guide rail system until the "V" shaped cam approaches the first shaping roller of the straw clamping device and contacts the arc-shaped shaping plate, clamping the straw between the first shaping roller and the arc-shaped shaping plate. S4. The cam drive mechanism drives the cam mounting seat to lift and lower to raise the height of the "V" shaped cam. The two shaping rollers of the "V" shaped cam are subjected to the force from the straw and the arc shaping plate, causing the "V" shaped cam to rotate around the rotation axis in the direction of the straw clamping device, so as to bend the straw between the first shaping roller, the second shaping roller and the arc shaping plate backward and upward. S5. The upper shaping component and the lower bending component are put into place.

10. The straw bending method as described in claim 9, characterized in that, Step S4 also includes: During or after bending the straw, cool the bent part of the straw with a blower.

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