Customized preparation device and preparation method of PLA (polylactic acid) straw

Abstract

The invention discloses a PLA suction pipe customized preparation device and a preparation method thereof, and relates to the field of PLA product processing.The PLA suction pipe customized preparation device comprises a base plate, a gear motor and a spiral conveying pipeline fixedly installed at the end of the gear motor, and the output end of the gear motor is fixedly connected with a spiral rod of the spiral conveying pipeline; the top of the spiral conveying pipeline communicates with a discharging hopper. An integrated production system from raw material conveying to final customized forming is constructed, the base plate provides a stable mounting platform, it is ensured that all the components work cooperatively, the speed reduction motor is matched with the spiral conveying pipeline and the discharging hopper to achieve continuous and stable conveying of the PLA raw materials, the production efficiency is improved, a shaping rod in the discharging head provides preliminary tubular structure shaping for suction pipes, and the production efficiency is improved. And a foundation is laid for subsequent customization processing, the first customization mechanism and the second customization mechanism are closely connected, and the functions of shaping, cooling, spraying, coining and the like are integrated.

Description

Technical Field

[0001] This invention relates to the field of PLA product processing technology, specifically to a PLA straw customization preparation device and preparation method. Background Technology

[0002] With the popularization of environmental protection concepts, PLA material is widely used in the production of disposable products such as straws due to its biodegradable properties. The market demand for customized PLA straws is growing, including different shapes, sizes, surface patterns and colors.

[0003] For example, the method of preparing a heat-resistant PLA straw, which is disclosed in CN114986836A, includes the following steps: (1) PLA straw raw material is prepared by extrusion tube drawing process to obtain straw preform, which contains PLA that has not completed crystallization; (2) The straw preform is treated by constant temperature and constant pressure carbon dioxide immersion treatment to make the uncrystallized PLA in the straw preform complete crystallization, and a PLA straw product with a temperature resistance of ≥70℃ is prepared.

[0004] However, while existing technologies can achieve basic extrusion molding of PLA straws, they are limited in terms of customized processing. It is difficult to flexibly adjust parameters such as the diameter and shape of the straw, and the surface treatment function is limited, which cannot meet the diverse customization needs. Most PLA straw preparation devices have problems such as low functional integration and insufficient customization capabilities. For example, the shaping mechanism is not flexible and it is difficult to process the shape of the straw. The positioning accuracy of surface spraying and pattern imprinting is poor and deviations are prone to occur. The connection between various processing links is not tight enough, resulting in low production efficiency and an inability to efficiently respond to the market's production demand for customized PLA straws. Summary of the Invention

[0005] The purpose of this invention is to provide a PLA straw customization preparation device and preparation method, so as to solve the problems mentioned in the background art, such as insufficient customization capability, low processing accuracy, low functional integration, and inability to meet diverse customization needs and efficient production.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a PLA straw customization preparation device and its preparation method, comprising a substrate, a geared motor, and a spiral conveying pipe fixedly installed at the end of the geared motor. The output end of the geared motor is fixedly connected to the spiral rod of the spiral conveying pipe. The top of the spiral conveying pipe is connected to a hopper. The end of the spiral conveying pipe is sequentially connected to a discharge head, a first customization mechanism, and a second customization mechanism. A shaping rod is fixedly installed inside the discharge head. The first customization mechanism includes a first receiving shell, an extension pipe, and a shaping mechanism installed inside the extension pipe. The extension pipe is located at six equal division points of the first receiving shell. Electromagnets are fixedly installed inside three of the extension pipes. A permanent magnet bead is suspended inside the first receiving shell. The permanent magnet bead is located at the center of the first receiving shell under the magnetic force of the electromagnet.

[0007] A connecting pipe is fixedly connected to one side of the first receiving shell, and the connecting pipe communicates with the discharge head. A cooling pipe is fixedly connected to the other side of the first receiving shell, and the cooling pipe is fixedly connected to the second customized mechanism. The second customized mechanism includes a second receiving shell and an atomizing nozzle and a movable block located at its six equal division points. The movable block and the atomizing nozzle are arranged alternately, and an impression roller is rotatably installed at the end of the movable block.

[0008] Preferably, the end of the extension pipe is detachably connected to a limiting plate by bolts. The limiting plate is used to support the shaping mechanism and the electromagnet. An external end is fixedly installed on the top of the cooling pipe, and the internal part of the external end is connected to an infusion pipe.

[0009] Preferably, a first electric cylinder is fixedly connected to the bottom of the movable block and the bottom of the atomizing nozzle. The first electric cylinder at the bottom of the atomizing nozzle is fixedly installed on the inner wall of the second receiving shell. A feeding pipe is connected to the edge of the atomizing nozzle, and the feeding pipe passes through the second receiving shell.

[0010] Preferably, a support block is fixedly connected to the end of the first electric cylinder at the bottom of the movable block, and a connecting seat is rotatably connected to the end of the support block. A positioning tube is fixedly installed at the three equal division points of the second receiving shell, and the connecting seat is threadedly connected to the positioning tube.

[0011] Preferably, the shaping mechanism includes a second electric cylinder and a limiting block fixedly installed at the end of its housing. A transmission rod is fixedly installed at one end of the piston rod of the second electric cylinder. Both ends of the transmission rod are rotatably connected to bending rods, and the other end of the bending rod is rotatably connected to a gripper.

[0012] Preferably, a trapezoidal frame is fixedly connected to the end of the limiting block, the bent part of the bending rod is rotatably installed at the corner of the trapezoidal frame, a connecting rod is rotatably connected to the outer wall of the trapezoidal frame, and the connecting rod is rotatably connected to the gripper.

[0013] A method for preparing a PLA straw customized preparation device, specifically using a customized straw preparation system, including a raw material storage and conveying module, a preliminary melting and plasticizing module, a prototype extrusion molding module, a magnetic levitation inner support module, an outer wall shaping and adjustment module, a segmented cooling and shaping module, a multi-color spraying control module, a pattern imprinting and positioning module, a dimensional accuracy detection module, and a parameter preset and call module.

[0014] Preferably, the raw material storage and conveying module consists of a hopper, a spiral conveying pipe, and a geared motor. A raw material level sensor is installed inside the hopper, which stores PLA granular raw materials. The preliminary melting and plasticizing module includes a heating section installed in the spiral conveying pipe. A temperature sensor and a heating rod are installed inside the heating section. The temperature sensor monitors the temperature of the raw material within the heating section. The prototype extrusion molding module consists of an outlet head and a shaping rod. An infrared sensor is installed at the end of the outlet head. The magnetic levitation inner support module consists of a first receiving shell, permanent magnet beads, and an electromagnet. The electromagnet is electrically connected to a current regulating module. A Hall sensor is fixedly installed on the inner wall of the first receiving shell. The outer wall shaping regulating module controls the shaping mechanism. The segmented cooling and shaping module consists of a cooling pipe, an external connector, and a liquid delivery pipe. The multi-color spraying control module consists of an atomizing nozzle, a feeding pipe, and a first electric motor. The system comprises a cylinder, a feeding pump connected to the end of the feeding pipe, a color switching valve inside the feeding pipe, a pattern imprinting positioning module consisting of a movable block, an imprinting roller, a positioning tube, a connecting seat, a support block, and a first electric cylinder, a dimensional accuracy detection module including multiple sets of laser displacement sensors, an image detection camera, and a data processing unit, wherein the laser displacement sensors and the image detection camera are respectively located at the discharge head, the outlet of the first receiving shell, the junction of the cooling pipe and the second receiving shell, and the outlet of the second receiving shell, the image detection camera being used to photograph the cross-section and surface of the suction tube, and the data processing unit being electrically connected to the laser displacement sensors and the image detection camera, and a parameter preset and recall module including a human-machine interface touch screen, a PLC storage unit, and a parameter encryption module, wherein the human-machine interface touch screen is electrically connected to the PLC, the PLC storage unit being used to store customized parameters, and the parameter encryption module being used to encrypt the parameters.

[0015] Preferably, it includes the following steps:

[0016] S1: Input customized parameters via the human-machine interaction touch screen. The customized parameters include diameter, length, color code and pattern number, etc. The parameter encryption module encrypts the input parameters and stores them in the PLC storage unit.

[0017] S2: The raw material storage and conveying module is started. The PLA granular raw material in the hopper is conveyed at a set rate through the screw conveyor pipe under the drive of the geared motor. The raw material level sensor monitors the remaining raw material in real time and triggers an alarm when it is lower than the threshold.

[0018] S3: The initial melting and plasticizing module is working. The heating section of the spiral conveying pipe is heated by heating rods. Temperature sensors monitor the raw material temperature in real time. The PLC adjusts the heating power to melt and plasticize the PLA raw material in the range of 170-190℃.

[0019] S4: The molten raw material enters the prototype extrusion molding module, and is extruded into a tubular structure through the extrusion die of the discharge head under the central positioning action of the shaping rod. The infrared sensor detects whether the prototype is continuously extruded and sends a feedback signal to the PLC to coordinate the rhythm of the preceding and following processes.

[0020] S5: The tubular structure enters the magnetic levitation inner support module. The Hall sensor monitors the position of the permanent magnet bead in real time. The PLC changes the current of the electromagnet through the current adjustment module, so that the permanent magnet bead is stably suspended in the center of the first receiving shell, providing dynamic support for the inner wall of the straw.

[0021] S6: The outer wall shaping and adjustment module is activated, the limit plate fixes the position of the shaping mechanism, the second electric cylinder drives the transmission rod, which is transmitted through the bending rod and the trapezoidal frame, so that the gripper opens and closes under the guidance of the connecting rod, and works with the permanent magnet bead to squeeze the tube wall to achieve the customization of diameter and cross-sectional shape;

[0022] S7: After shaping, the straw enters the segmented cooling and shaping module. The first-stage cooling section of the cooling tube inputs 30-40℃ cooling water through the external terminal to quickly reduce the temperature of the straw to below the glass transition temperature. The second-stage cooling section inputs 10-20℃ cooling water to further solidify the shape. The PLC adjusts the flow valves of each section according to the data from the laser displacement sensor.

[0023] S8: The multi-color spraying control module is working. The PLC controls the feeding pump to deliver the corresponding color material through the feeding pipe according to the preset color parameters. The color switching valve realizes the rapid switching of different color materials. The first electric cylinder drives the atomizing nozzle to move and adjust the spraying distance and angle to achieve precise spraying of single color, multi-color gradient or specific areas.

[0024] S9: The pattern imprinting positioning module is started. The positioning tube and the connecting seat are threaded together. The support block adjusts the initial position of the movable block. The first electric cylinder drives the movable block to make fine adjustments so that the imprinting roller and the suction tube surface are in close contact. At the same time, the encoder monitors the suction tube speed to ensure that the pattern imprinting is free from offset and stretching.

[0025] S10: The dimensional accuracy detection module detects the straw. The laser displacement sensor detects parameters such as diameter and wall thickness. The image detection camera captures the cross-section and surface of the straw. The data processing unit compares the data with the preset parameters. If the data exceeds the tolerance, it is fed back to the PLC for adjustment.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. In this invention, by integrating core components such as a substrate, a geared motor, a spiral conveying pipe, and a hopper, an integrated production system from raw material transportation to final customized molding is constructed. The substrate provides a stable installation platform to ensure that all components work together. The geared motor, spiral conveying pipe, and hopper work together to achieve continuous and stable transportation of PLA raw materials, improving production efficiency. The shaping rod in the discharge head provides preliminary tubular structure shaping for the straw, laying the foundation for subsequent customized processing. The first and second customization mechanisms are closely connected, integrating functions such as shaping, cooling, spraying, and imprinting to achieve fully automated production, reduce manual intervention, and ensure production continuity and stability. The overall device has a compact structure and high functional integration, and can efficiently complete various processes of customized straw preparation.

[0028] 2. In this invention, in the first customization mechanism, an electromagnet works in conjunction with a permanent magnet bead to precisely control the position of the permanent magnet bead using magnetic force. Combined with the shaping mechanism, the appearance parameters such as the diameter and shape of the suction tube can be flexibly customized. The limiting plate at the end of the extension pipe is detachably connected, which facilitates the replacement of the shaping mechanism and the electromagnet, enhancing the adaptability of the device to different shaping needs. The cooling pipe cools the suction tube in time through an external cooling medium to ensure its shape stability and avoid deformation during subsequent processing. In the second customization mechanism, the first electric cylinder adjusts the position of the movable block and the atomizing nozzle to adapt to suction tubes of different sizes. The feeding pipe ensures a stable supply of paint. The threaded connection between the support block and the positioning tube enables precise positioning of the imprinting roller, improving imprinting accuracy. The positioning tube is set at the three equal division points of the second receiving shell to ensure that the movable block is subjected to balanced force, further ensuring processing quality. The synergistic effect of each mechanism allows the device to meet diverse customization needs while ensuring product accuracy.

[0029] 3. In this invention, the second electric cylinder serves as the power source. Through the linkage of components such as the transmission rod, bending rod, and gripper, the extension and retraction motion of the piston rod is converted into the precise opening and closing action of the gripper. The trapezoidal frame provides a stable fulcrum for the bending rod, and the connecting rod assists in guiding the movement of the gripper, ensuring its stable motion trajectory and preventing skewing or deformation during straw shaping. The limiting block fixes the position of the second electric cylinder to prevent work deviation and improve the overall structural stability. This design allows the degree of gripper opening and closing to be precisely controlled by the second electric cylinder, meeting the shaping needs of straws of different diameters and shapes, enhancing the device's adaptability to customized processing, extending the service life of components, and ensuring that the device maintains good customization effects and processing quality during long-term efficient operation, thus comprehensively improving the overall performance of PLA straw customized preparation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a PLA straw customization preparation device according to the present invention;

[0031] Figure 2 This is a schematic diagram of the end face of a PLA straw customization preparation device according to the present invention;

[0032] Figure 3 This is a three-dimensional structural diagram of the first and second customized mechanisms of a PLA straw customization preparation device according to the present invention;

[0033] Figure 4 This is a schematic diagram of the internal structure of the first and second customized mechanisms of the PLA straw customization preparation device of the present invention;

[0034] Figure 5 This is a schematic diagram of the first customized mechanism of the PLA straw customized preparation device of the present invention;

[0035] Figure 6 For the present invention Figure 5 Enlarged structural diagram of section A;

[0036] Figure 7 This is a schematic diagram of the second customized mechanism of the PLA straw customized preparation device of the present invention;

[0037] Figure 8 This is a schematic diagram of the process for a customized PLA straw preparation device according to the present invention;

[0038] Figure 9 This is a schematic diagram of the shaping and coating process of a PLA straw customization preparation device according to the present invention.

[0039] In the diagram: 1. Base plate; 2. Gear motor; 3. Spiral conveyor pipe; 4. Feed hopper; 5. Discharge head; 6. First custom mechanism; 7. Second custom mechanism; 8. Shaping rod; 9. Forming mechanism; 10. Permanent magnet bead; 11. Electromagnet; 61. First receiving shell; 62. Extension pipe; 63. Limiting plate; 64. Connecting pipe; 65. Cooling pipe; 66. External end; 67. Infusion pipe; 71. Second receiving shell; 72. Support block; 73. Movable block; 74. Connecting seat; 75. Atomizing nozzle; 76. First electric cylinder; 77. Feeding pipe; 78. Imprint roller; 79. Positioning pipe; 91. Second electric cylinder; 92. Limiting block; 93. Transmission rod; 94. Trapezoidal frame; 95. Bending rod; 96. Gripper; 97. Connecting rod. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1: Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown: A PLA straw customization preparation device and its preparation method include a substrate 1, a reduction motor 2 and a spiral conveying pipe 3 fixedly installed at the end of the reduction motor 2. The output end of the reduction motor 2 is fixedly connected to the spiral rod of the spiral conveying pipe 3. The top of the spiral conveying pipe 3 is connected to a hopper 4. The end of the spiral conveying pipe 3 is sequentially connected to a discharge head 5, a first customization mechanism 6 and a second customization mechanism 7. A shaping rod 8 is fixedly installed inside the discharge head 5. The first customization mechanism 6 includes a first receiving shell 61, an extension pipe 62 and a shaping mechanism 9 installed inside the extension pipe 62. The extension pipe 62 is located at the six equal division points of the first receiving shell 61. Electromagnets 11 are fixedly installed inside the three extension pipes 62. Permanent magnet beads 10 are suspended inside the first receiving shell 61. Under the magnetic force of the electromagnets 11, the permanent magnet beads 10 are located at the center of the first receiving shell 61.

[0042] A connecting pipe 64 is fixedly connected to one side of the first receiving shell 61. The connecting pipe 64 is connected to the discharge head 5. A cooling pipe 65 is fixedly connected to the other side of the first receiving shell 61. The cooling pipe 65 is fixedly connected to the second customized mechanism 7. The second customized mechanism 7 includes a second receiving shell 71, an atomizing nozzle 75 located at its six division points, and a movable block 73. The movable block 73 and the atomizing nozzle 75 are arranged alternately. An impression roller 78 is rotatably installed at the end of the movable block 73.

[0043] The end of the extension pipe 62 is detachably connected to a limiting plate 63 by bolts. The limiting plate 63 is used to support the shaping mechanism 9 and the electromagnet 11. An external end 66 is fixedly installed on the top of the cooling pipe 65. An infusion pipe 67 is connected inside the external end 66.

[0044] In this embodiment, the substrate 1 serves as the basic support structure for the entire device, providing an installation platform for each component. When the geared motor 2 operates, it drives the screw rod at its end to rotate. The screw rod is located inside the screw conveying pipe 3. After the hopper 4 adds PLA raw material into the screw conveying pipe 3, the screw rod, driven by the geared motor 2, conveys the raw material forward, achieving continuous supply of raw material. After the raw material is conveyed to the output end through the screw conveying pipe 3, it enters the discharge head 5. The shaping rod 8 inside the discharge head 5 performs basic shaping on the initially formed PLA material, making it form a tubular structure, laying the foundation for subsequent customized processing. Subsequently, the initially shaped PLA suction tube enters the first customization mechanism 6. The first receiving shell 61 is connected to the discharge head 5 through the connecting pipe 64, allowing the PLA to flow smoothly. A straw can enter the interior of the first receiving shell 61. Extension pipes 62 are located at six equal division points of the first receiving shell 61. Electromagnets 11 fixedly installed within three of these extension pipes 62 generate magnetic force when energized. Permanent magnetic beads 10 are suspended inside the first receiving shell 61. Under the magnetic force of multiple sets of electromagnets 11, the permanent magnetic beads 10 are stably positioned at the center of the first receiving shell 61. During straw delivery, the permanent magnetic beads 10, located inside the straw, provide support and shaping. Simultaneously, a limiting plate 63, detachably connected to the end of the extension pipes 62 by bolts, supports and fixes the shaping mechanism 9 and the electromagnets 11. Supported by the limiting plate 63, the shaping mechanism 9, in conjunction with the centrally located permanent magnetic beads 10, can customize the shape of the PLA straw. The shaping process involves adjusting the magnetic force of the electromagnet 11 to change the position of the permanent magnet bead 10, thereby cooperating with the shaping mechanism 9 to customize the appearance parameters such as the diameter and shape of the straw. After the initial shaping, the PLA straw is transported to the second customization mechanism 7 through the cooling pipe 65 on the other side of the first receiving shell 61. The external end 66 at the top of the cooling pipe 65 can be connected to a cooling medium supply device. The cooling medium enters the cooling pipe 65 through the infusion pipe 67 to cool and shape the PLA straw, preventing it from being affected by unstable shape in subsequent processing. After entering the second customization mechanism 7, the second receiving shell 71 provides space for further customization of the straw. The atomizing nozzles 75 and movable blocks 73, which are staggered at its six equal division points, respectively achieve different positioning. The device features a customizable design. The atomizing nozzle 75 can spray specific colors onto the surface of the PLA straw according to requirements, satisfying customization needs. The embossing roller 78, rotatably mounted at the end of the movable block 73, can emboss logos, patterns, and other markings on the straw surface, enabling brand or pattern customization. The movable block 73 allows adjustment of the embossing roller 78's position based on the straw size, ensuring precise embossing. Furthermore, the limiting plate 63 at the end of the extension pipe 62 uses a bolt-detachable connection, facilitating replacement or maintenance of the shaping mechanism 9 and electromagnet 11 to adapt to different shaping needs. The coordinated operation of all components enables integrated production of PLA straws, from raw material delivery to final customized molding. The base plate 1 ensures the overall stability of the device, guaranteeing smooth production.The geared motor 2, in conjunction with the screw conveyor pipe 3 and the hopper 4, achieves continuous and stable conveying of PLA raw materials, improving production efficiency. The shaping rod 8 inside the discharge head 5 provides initial shaping for the straw, ensuring its basic tubular structure. In the first customization mechanism 6, the electromagnet 11 and the permanent magnet bead 10 work together to precisely control the position of the permanent magnet bead 10 through magnetic force. Combined with the shaping mechanism 9, the straw's shape can be flexibly customized to meet the needs of different diameters and shapes. Furthermore, the limiting plate 63 at the end of the extension pipe 62 is easy to disassemble and assemble, facilitating the replacement of different shaping mechanisms 9 and electromagnets according to customization requirements. 11. The adaptability of the device is enhanced. Cooling pipe 65 introduces cooling medium through external end 66 and infusion pipe 67 to cool the shaped straw in a timely manner, ensuring the straw's shape is stable and preventing deformation during subsequent processing. In the second customization mechanism 7, atomizing nozzle 75 enables color customization of the straw surface, and imprinting roller 78 at the end of movable block 73 enables imprinting customization of patterns and markings. The two are arranged alternately, allowing for simultaneous spraying and imprinting operations, improving customization efficiency and meeting diverse appearance customization needs. The overall device integrates functions such as conveying, shaping, cooling, spraying, and imprinting.

[0045] Example 2: According to Figure 4 and Figure 7 As shown, a first electric cylinder 76 is fixedly connected to the bottom of the movable block 73 and the bottom of the atomizing nozzle 75. The first electric cylinder 76 at the bottom of the atomizing nozzle 75 is fixedly installed on the inner wall of the second receiving shell 71. A feeding pipe 77 is connected to the edge of the atomizing nozzle 75 and passes through the second receiving shell 71. A support block 72 is fixedly connected to the end of the first electric cylinder 76 at the bottom of the movable block 73. A connecting seat 74 is rotatably connected to the end of the support block 72. A positioning tube 79 is fixedly installed at the three equal division points of the second receiving shell 71. The connecting seat 74 is threadedly connected to the positioning tube 79.

[0046] In this embodiment, the movable block 73 and the atomizing nozzle 75 are positioned by a first electric cylinder 76 at the bottom. The first electric cylinder 76 at the bottom of the atomizing nozzle 75 is fixed to the inner wall of the second receiving shell 71, providing stable support for the atomizing nozzle 75 and driving its movement to accommodate suction tubes of different diameters. The feed tube 77 passes through the second receiving shell 71 to deliver paint to the atomizing nozzle 75. The end of the first electric cylinder 76 at the bottom of the movable block 73 is connected to a support block 72. The connecting seat 74 at the end of the support block 72 is threadedly connected to the positioning tube 79 at the three division points of the second receiving shell 71. The support block 72 and the first electric cylinder 76 can be adjusted by rotating the connecting seat 74. The position, in conjunction with the first electric cylinder 76 driving the movable block 73 to move, achieves precise positioning of the impression roller 78. The first electric cylinder 76 can flexibly adjust the position of the movable block 73 and the atomizing nozzle 75 to adapt to the customized needs of different sized suction tubes. The feed pipe 77 ensures a stable supply of paint and guarantees continuous spraying. The threaded connection between the connecting seat 74 and the positioning tube 79 not only achieves fine adjustment of the position of the movable block 73, but also enhances the structural stability. The positioning tube 79 is set at three equal points on the second receiving shell 71 to make the movable block 73 bear force evenly and improve the impression accuracy. The second customized mechanism 7 can meet diverse impression and spraying needs and enhance the applicability of the device.

[0047] Example 3: According to Figure 5 and Figure 6 As shown, the shaping mechanism 9 includes a second electric cylinder 91 and a limiting block 92 fixedly installed at the end of its outer shell. A transmission rod 93 is fixedly installed at one end of the piston rod of the second electric cylinder 91. Both ends of the transmission rod 93 are rotatably connected to bending rods 95. The other end of the bending rod 95 is rotatably connected to a gripper 96. A trapezoidal frame 94 is fixedly connected to the end of the limiting block 92. The bent part of the bending rod 95 is rotatably installed at the corner of the trapezoidal frame 94. A connecting rod 97 is rotatably connected to the outer wall of the trapezoidal frame 94. The connecting rod 97 is rotatably connected to the gripper 96.

[0048] In this embodiment, the second electric cylinder 91 serves as a power source. The limiting block 92 at the end of its outer casing fixes its position to prevent displacement during operation. When the piston rod of the second electric cylinder 91 extends or retracts, it drives the transmission rod 93, which is fixed to it, to move synchronously. The bent rod 95, rotatably connected to both ends of the transmission rod 93, is then pulled or pushed. Since the bent portion of the bent rod 95 is rotatably mounted at the corner of the trapezoidal frame 94, and the trapezoidal frame 94 is stably supported by the fixed connection at the end of the limiting block 92, the bent rod 95 will move with the corner of the trapezoidal frame 94 as its base. The fulcrum rotates, causing the gripper 96, which is rotatably connected to the other end, to open and close. Simultaneously, the connecting rod 97, rotatably connected to the outer wall of the trapezoidal frame 94, is rotatably connected to the gripper 96, providing auxiliary support and guidance during the gripper 96's movement, ensuring a stable trajectory. The second electric cylinder 91 provides precise power output, accurately controlling the movement distance of the transmission rod 93 through the extension and retraction of the piston rod, thereby achieving precise adjustment of the opening and closing degree of the gripper 96. The opening and closing of the gripper 96 compresses the originally round straw into an irregularly shaped straw, clamping the straw... The straw can be adjusted in shape by moving the gripper 96 or pulling it into other shapes. The limiting block 92 not only fixes the position of the second electric cylinder 91, but also provides a stable mounting base for the trapezoidal frame 94, ensuring the structural stability of the entire shaping mechanism 9. The trapezoidal frame 94 provides a reliable fulcrum for the bending rod 95, and its shape design can adapt to the rotation trajectory of the bending rod 95, reducing motion interference. The bending rod 95 converts the linear motion of the transmission rod 93 into the opening and closing action of the gripper 96 through the lever principle, resulting in efficient and stable transmission. With the assistance and guidance of the connecting rod 97, the gripper 96 moves more smoothly, avoiding the straw from tilting or deforming during the shaping process and improving the shaping accuracy. The connecting rod 97 enhances the connection strength between the gripper 96 and the trapezoidal frame 94, preventing the gripper 96 from being damaged due to excessive force and extending the service life of the components. This gives the shaping mechanism 9 the characteristics of flexible adjustment, precise shaping, and stable structure, which can efficiently adapt to straw shaping work with different customized needs, further improving the customization capability and production quality of the entire PLA straw customization preparation device.

[0049] Example 4: According to Figure 8 and Figure 9 As shown, a method for preparing a PLA straw customized preparation device is described. Specifically, a customized straw preparation system is used, including a raw material storage and conveying module, a preliminary melting and plasticizing module, a prototype extrusion molding module, a magnetic levitation inner support module, an outer wall shaping and adjustment module, a segmented cooling and shaping module, a multi-color spraying control module, a pattern imprinting and positioning module, a dimensional accuracy detection module, and a parameter preset and call module.

[0050] The raw material storage and conveying module consists of a hopper 4, a spiral conveying pipe 3, and a geared motor 2. A raw material level sensor is installed inside the hopper 4, which stores PLA granules. The preliminary melting and plasticizing module includes a heating section located in the spiral conveying pipe 3. A temperature sensor and a heating rod are installed inside the heating section to monitor the temperature of the raw material. The prototype extrusion molding module consists of an outlet head 5 and a shaping rod 8. An infrared sensor is installed at the end of the outlet head 5. The magnetic levitation internal support module consists of a first receiving shell 61, permanent magnet beads 10, and an electromagnet 11. The electromagnet 11 is electrically connected to a current adjustment module. A Hall sensor is fixedly installed on the inner wall of the first receiving shell 61. The outer wall shaping adjustment module controls the shaping mechanism 9. The segmented cooling and shaping module consists of a cooling pipe 65, an external end 66, and a liquid delivery pipe 67. The multi-color spraying control module consists of an atomizing nozzle 75, a feeding pipe 77, and a first electric cylinder 7. The system consists of six components: a feeding pipe 77 connected to a feeding pump at its end; a color switching valve inside the feeding pipe 77; a pattern imprinting positioning module consisting of a movable block 73, an imprinting roller 78, a positioning pipe 79, a connecting seat 74, a support block 72, and a first electric cylinder 76; a dimensional accuracy detection module including multiple sets of laser displacement sensors, an image detection camera, and a data processing unit; laser displacement sensors and image detection cameras respectively located at the discharge head 5, the outlet of the first receiving shell 61, the junction of the cooling pipe 65 and the second receiving shell 71, and the outlet of the second receiving shell 71; the image detection camera is used to photograph the cross-section and surface of the suction tube; the data processing unit is electrically connected to the laser displacement sensors and the image detection camera; and a parameter preset and recall module including a human-machine interface touch screen, a PLC storage unit, and a parameter encryption module; the human-machine interface touch screen is electrically connected to the PLC; the PLC storage unit is used to store customized parameters; and the parameter encryption module is used to encrypt the parameters.

[0051] How to use and how to work this device:

[0052] Step 1: Input customized parameters through the human-machine interface touch screen. Customized parameters include diameter, length, color code and pattern number, etc. The parameter encryption module encrypts the input parameters and stores them in the PLC storage unit.

[0053] Step 2: The raw material storage and conveying module is started. The PLA granular raw material in the hopper 4 is conveyed at a set rate through the screw conveying pipe 3 under the drive of the reduction motor 2. The raw material level sensor monitors the remaining raw material in real time and triggers an alarm when it is lower than the threshold.

[0054] Step 3: The initial melting and plasticizing module is working. The heating section of the spiral conveying pipe 3 is heated by heating rods. The temperature sensor monitors the raw material temperature in real time. The PLC adjusts the heating power to melt and plasticize the PLA raw material in the range of 170-190℃.

[0055] Step 4: The molten raw material enters the prototype extrusion molding module, and is extruded into a tubular structure under the central positioning action of the shaping rod 8 through the extrusion die of the discharge head 5. The infrared sensor detects whether the prototype is continuously extruded and sends a feedback signal to the PLC to coordinate the rhythm of the preceding and following processes.

[0056] Step 5: The tubular structure enters the magnetic levitation inner support module. The Hall sensor monitors the position of the permanent magnet bead 10 in real time. The PLC changes the current of the electromagnet 11 through the current adjustment module, so that the permanent magnet bead 10 is stably suspended in the center of the first receiving shell 61, providing dynamic support for the inner wall of the straw.

[0057] Step 6: The outer wall shaping and adjustment module is activated, the limit plate 63 fixes the position of the shaping mechanism 9, the second electric cylinder 91 drives the transmission rod 93, which is transmitted through the bending rod 95 and the trapezoidal frame 94, so that the gripper 96 opens and closes under the guidance of the connecting rod 97, and works with the permanent magnet bead 10 to squeeze the tube wall to achieve the customization of diameter and cross-sectional shape;

[0058] Step 7: After shaping, the straw enters the segmented cooling and shaping module. The first-stage cooling section of the cooling pipe 65 is supplied with 30-40℃ cooling water through the external terminal 66 to quickly reduce the temperature of the straw to below the glass transition temperature. The second-stage cooling section is supplied with 10-20℃ cooling water to further solidify the shape. The PLC adjusts the flow valves of each section according to the data from the laser displacement sensor.

[0059] Step 8: The multi-color spraying control module works. The PLC controls the feeding pump to deliver the corresponding color material through the feeding pipe 77 according to the preset color parameters. The color switching valve realizes the rapid switching of different color materials. The first electric cylinder 76 drives the atomizing nozzle 75 to move, adjusting the spraying distance and angle to achieve precise spraying of single color, multi-color gradient or specific areas.

[0060] Step 9: The pattern imprinting positioning module is activated. The positioning tube 79 is threadedly engaged with the connecting seat 74. The support block 72 adjusts the initial position of the movable block 73. The first electric cylinder 76 drives the movable block 73 to make fine adjustments, so that the imprinting roller 78 is in close contact with the surface of the suction tube. At the same time, the speed of the suction tube is monitored by the encoder to ensure that the pattern imprinting is free from offset and stretching.

[0061] Step 10: The dimensional accuracy detection module detects the straw. The laser displacement sensor detects parameters such as diameter and wall thickness. The image detection camera captures the cross-section and surface of the straw. The data processing unit compares the data with the preset parameters. If the data exceeds the tolerance, it is fed back to the PLC for adjustment.

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A PLA straw customization preparation device, comprising a substrate (1), a geared motor (2), and a spiral conveying pipe (3) fixedly installed at the end of the geared motor (2), wherein the output end of the geared motor (2) is fixedly connected to the spiral rod of the spiral conveying pipe (3), and the top of the spiral conveying pipe (3) is connected to a hopper (4), characterized in that: The end of the spiral conveying pipe (3) is connected in sequence to the discharge head (5), the first custom mechanism (6) and the second custom mechanism (7). The discharge head (5) is fixedly installed with a shaping rod (8). The first custom mechanism (6) includes a first receiving shell (61), an extension pipe (62) and a shaping mechanism (9) installed on its inner side. The extension pipe (62) is located at the six division points of the first receiving shell (61). Electromagnets (11) are fixedly installed inside the three extension pipes (62). Permanent magnet beads (10) are suspended on the inner side of the first receiving shell (61). The permanent magnet beads (10) are located at the center of the first receiving shell (61) under the magnetic force of multiple sets of electromagnets (11). A connecting pipe (64) is fixedly connected to one side of the first receiving shell (61), and the connecting pipe (64) communicates with the discharge head (5). A cooling pipe (65) is fixedly connected to the other side of the first receiving shell (61), and the cooling pipe (65) is fixedly connected to the second customized mechanism (7). The second customized mechanism (7) includes a second receiving shell (71), an atomizing nozzle (75) located at its six equal division points, and a movable block (73). The movable block (73) and the atomizing nozzle (75) are arranged alternately. An impression roller (78) is rotatably installed at the end of the movable block (73).

2. The PLA straw customization preparation device according to claim 1, characterized in that: The end of the extension pipe (62) is detachably connected to a limiting plate (63) by bolts. The limiting plate (63) is used to support the shaping mechanism (9) and the electromagnet (11). An external end (66) is fixedly installed on the top of the cooling pipe (65). An infusion pipe (67) is connected inside the external end (66).

3. The PLA straw customization preparation device according to claim 2, characterized in that: The bottom of the movable block (73) and the bottom of the atomizing nozzle (75) are both fixedly connected to a first electric cylinder (76). The first electric cylinder (76) at the bottom of the atomizing nozzle (75) is fixedly installed on the inner wall of the second receiving shell (71). A feeding pipe (77) is connected to the edge of the atomizing nozzle (75), and the feeding pipe (77) passes through the second receiving shell (71).

4. The PLA straw customization preparation device according to claim 3, characterized in that: The bottom of the movable block (73) has a support block (72) fixedly connected to the end of the first electric cylinder (76), and the end of the support block (72) is rotatably connected to a connecting seat (74). The second receiving shell (71) has a positioning tube (79) fixedly installed at the three division points, and the connecting seat (74) is threadedly connected to the positioning tube (79).

5. The PLA straw customization preparation device according to claim 4, characterized in that: The shaping mechanism (9) includes a second electric cylinder (91) and a limiting block (92) fixedly installed at the end of its housing. A transmission rod (93) is fixedly installed at one end of the piston rod of the second electric cylinder (91). Both ends of the transmission rod (93) are rotatably connected to a bending rod (95). The other end of the bending rod (95) is rotatably connected to a gripper (96).

6. The PLA straw customization preparation device according to claim 5, characterized in that: The end of the limiting block (92) is fixedly connected to a trapezoidal frame (94), the bent part of the bending rod (95) is rotatably installed at the corner of the trapezoidal frame (94), and a connecting rod (97) is rotatably connected to the outer wall of the trapezoidal frame (94). The connecting rod (97) is rotatably connected to the gripper (96).

7. A method for preparing a PLA straw customization preparation device, using the PLA straw customization preparation device according to any one of claims 1-6, characterized in that: Specifically, it uses a customized straw preparation system, including a raw material storage and conveying module, a preliminary melting and plasticizing module, a prototype extrusion molding module, a magnetic levitation inner support module, an outer wall shaping and adjustment module, a segmented cooling and shaping module, a multi-color spraying control module, a pattern imprinting and positioning module, a dimensional accuracy detection module, and a parameter preset and call module.

8. The method for preparing a PLA straw customization preparation device according to claim 7, characterized in that: The raw material storage and conveying module consists of a feeding hopper (4), a spiral conveying pipe (3), and a reduction motor (2). The feeding hopper (4) is equipped with a raw material level sensor and is used to store PLA granular raw materials. The preliminary melting and plasticizing module includes a heating section installed in the spiral conveying pipe (3). The heating section is equipped with a temperature sensor and a heating rod. The temperature sensor is used to monitor the temperature of the raw material in the heating section. The prototype extrusion molding module consists of a discharge head (5) and a shaping rod (8), and an infrared sensor is provided at the end of the discharge head (5); The magnetic levitation inner support module consists of a first housing shell (61), a permanent magnet bead (10), and an electromagnet (11). The electromagnet (11) is electrically connected to a current adjustment module. A Hall sensor is fixedly installed on the inner wall of the first housing shell (61). The outer wall shaping and adjustment module controls the shaping mechanism (9); The segmented cooling and shaping module consists of a cooling pipe (65), an external connector (66), and an infusion pipe (67); The multi-color spraying control module consists of an atomizing nozzle (75), a feeding pipe (77) and a first electric cylinder (76). The end of the feeding pipe (77) is connected to a feeding pump, and a color switching valve is installed inside the feeding pipe (77). The pattern imprinting positioning module consists of a movable block (73), an imprinting roller (78), a positioning tube (79), a connecting seat (74), a support block (72), and a first electric cylinder (76); The dimensional accuracy detection module includes multiple sets of laser displacement sensors, image detection cameras, and a data processing unit. The laser displacement sensors and image detection cameras are respectively set at the outlet head (5), the outlet of the first receiving shell (61), the junction of the cooling pipe (65) and the second receiving shell (71), and the outlet of the second receiving shell (71). The image detection camera is used to photograph the cross-section and surface of the suction tube. The data processing unit is electrically connected to the laser displacement sensors and the image detection camera. The parameter preset and recall module includes a human-machine interface touch screen, a PLC storage unit, and a parameter encryption module. The human-machine interface touch screen is electrically connected to the PLC, the PLC storage unit is used to store customized parameters, and the parameter encryption module is used to encrypt the parameters.

9. The method for preparing a PLA straw customization preparation device according to claim 8, characterized in that: Includes the following steps: S1. Input customized parameters through the human-machine interaction touch screen. The customized parameters include diameter, length, color code and pattern number, etc. The parameter encryption module encrypts the input parameters and stores them in the PLC storage unit. S2. The raw material storage and conveying module is started. The PLA granular raw material in the hopper (4) is conveyed at a set rate through the screw conveying pipe (3) under the drive of the geared motor (2). The raw material level sensor monitors the remaining raw material in real time and triggers an alarm when it is below the threshold. S3, the initial melting and plasticizing module is working, the heating section of the spiral conveying pipe (3) is heated by the heating rod, and the temperature sensor monitors the raw material temperature in real time; S4. The molten raw material enters the prototype extrusion molding module and is extruded into a tubular structure through the extrusion die of the discharge head (5) under the central positioning action of the shaping rod (8). The infrared sensor detects whether the prototype is continuously extruded and sends a feedback signal to the PLC to coordinate the rhythm of the preceding and following processes. S5. The tubular structure enters the magnetic levitation inner support module. The Hall sensor monitors the position of the permanent magnet bead (10) in real time. The PLC changes the current of the electromagnet (11) through the current adjustment module so that the permanent magnet bead (10) is stably suspended in the center of the first housing shell (61). S6. The outer wall shaping adjustment module is started, the limit plate (63) fixes the position of the shaping mechanism (9), the second electric cylinder (91) drives the transmission rod (93), and through the bending rod (95) and the trapezoidal frame (94) transmission, the gripper (96) opens and closes under the guidance of the connecting rod (97), and cooperates with the permanent magnet bead (10) to squeeze the tube wall to realize the customization of diameter and cross-sectional shape; S7. After shaping, the straw enters the segmented cooling and shaping module. The first-stage cooling section of the cooling pipe (65) inputs 30-40℃ cooling water through the external end (66) to quickly reduce the temperature of the straw to below the glass transition temperature. The second-stage cooling section inputs 10-20℃ cooling water to further solidify the shape. The PLC adjusts the flow valves of each section according to the data from the laser displacement sensor. S8. The multi-color spraying control module is working. The PLC controls the feeding pump to deliver the corresponding color material through the feeding pipe (77) according to the preset color parameters. The color switching valve realizes the rapid switching of different color materials. The first electric cylinder (76) drives the atomizing nozzle (75) to move and adjust the spraying distance and angle. S9. The pattern imprinting positioning module is started. The positioning tube (79) and the connecting seat (74) are threaded together. The support block (72) adjusts the initial position of the movable block (73). The first electric cylinder (76) drives the movable block (73) to make a fine adjustment so that the imprinting roller (78) is in close contact with the surface of the suction tube. At the same time, the speed of the suction tube is monitored by the encoder. S10, the dimensional accuracy detection module detects the straw. The laser displacement sensor detects the diameter and wall thickness parameters, the image detection camera captures the cross-section and surface of the straw, the data processing unit compares it with the preset parameters, and if the deviation is out of tolerance, it feeds back to the PLC for adjustment.

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