A PLA straw crystallization machine

Abstract

The present invention provides a PLA straw crystallization machine, comprising a frame and a transfer conveyor belt. The frame is provided with a storage bin, which includes a storage bottom plate, a guide side plate, a fixed side plate, a movable side plate, and a drive mechanism. The storage bottom plate is provided with a feed hole. The guide side plate is tilted and fixed to the side of the storage bottom plate away from the feed port. The fixed side plate is fixedly connected to the edge of the storage bottom plate. The movable side plate is slidably connected to the top surface of the storage bottom plate, and the movable side plate is parallel to the fixed side plate. The drive mechanism is fixedly connected to the top surface of the storage bottom plate. The output end of the drive mechanism is connected to the movable side plate to drive the movable side plate toward or away from the fixed side plate. The drive mechanism controls the movable side plate to move toward or away from the fixed side plate, which can be adjusted according to the length of the PLA straws to arrange and limit the PLA straws. In this way, the PLA straws can be more neatly inserted into the frame and more fully and evenly heated.

Description

Technical Field

[0001] The present invention relates to a crystallizer, in particular to a PLA straw crystallizer. Background Art

[0002] Currently, a Chinese patent with publication number CN113954396A discloses a PLA biodegradable straw crystallization furnace, which includes a frame, an insulation box, and a PLA straw transmission mechanism. The insulation box is provided with a preheating box and a heating box. The PLA straw transmission mechanism includes a drive motor, an active roller, a passive roller, and a tensioning system. The drive motor, the active roller, and the passive roller are all mounted on the frame. The active roller is connected to the passive roller via a conveyor belt. The drive motor drives the active roller to rotate, and the conveyor belt drives the PLA straws through the preheating box and the heating box. However, when using the above-mentioned crystallization furnace, a storage bin is generally installed on the frame to store the PLA straws to be processed and continuously place the PLA straws on top of the PLA straw transmission mechanism. However, the above-mentioned storage bin is mostly formed by welding metal plates, and there is a problem that the inner cavity cannot be adjusted according to the length of the PLA straws. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a PLA straw crystallization machine, which has the advantage that the inner wall of the storage bin can be adjusted according to the length of the PLA straw.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a PLA straw crystallizer, comprising a frame and a transfer conveyor belt, a heating chamber is provided inside the frame, a feed port and a discharge port are respectively provided at both ends of the frame, the feed port and the discharge port are both connected to the heating chamber, the transfer conveyor belt is arranged in the heating chamber, and the two ends of the transfer conveyor belt protrude from the feed port and the discharge port respectively, a storage bin is provided at the feed port, the storage bin is located above the transfer conveyor belt, the storage bin comprises a storage bottom plate, a guide side plate, a fixed side plate, a movable side plate and a driving mechanism, the storage bottom plate is fixedly connected to the The frame is described, a feeding hole is provided through the storage bottom plate, and the feeding hole is opposite to the transfer conveyor belt up and down, the guide side plate is fixed on the side of the storage bottom plate away from the feeding port, and the guide side plate is inclined, the fixed side plate is fixedly connected to the edge of the storage bottom plate, and the edge of the fixed side plate is engaged with the edge of the guide side plate, the movable side plate is slidably connected to the top surface of the storage bottom plate, and the movable side plate is parallel to the fixed side plate, the driving mechanism is fixedly connected to the top surface of the storage bottom plate, and the output end of the driving mechanism is connected to the movable side plate for driving the movable side plate to approach or move away from the fixed side plate.

[0005] Through the above technical solution, when a PLA straw crystallizer is needed to process PLA straws, the PLA straws to be processed are placed on the guide side plates. Under their own weight, the PLA straws slide along the guide side plates and enter between the fixed side plates and the movable side plates. Once a sufficient amount of PLA straws are stored between the fixed and movable side plates, the drive mechanism controls the movable side plates to gradually approach the fixed side plates. The transfer conveyor belt then transfers the PLA straws that have fallen from the feed hole to the machine frame for heating and crystallization. The drive mechanism controls the movable side plates to move closer to or away from the fixed side plates, adjusting the movement according to the length of the PLA straws to organize and limit the PLA straws. This allows the PLA straws to enter the machine frame more neatly and receive more sufficient and even heating.

[0006] Preferably, the side walls of the fixed side plate and the side walls of the movable side plate are both provided with stoppers, the stoppers are arranged in a direction parallel to the guide side plate, and the stoppers are tightly attached to the guide side plate.

[0007] With this technical solution, once a sufficient amount of PLA straws are stored between the fixed and movable side panels, the drive mechanism gradually moves the movable side panel closer to the fixed panel until the stops on the fixed and movable panels respectively contact the ends of the PLA straws. At this point, the fixed and movable panels will not clamp the PLA straws that are not in contact with the stops, allowing them to fall smoothly from the feed hole onto the transfer conveyor.

[0008] Preferably, a flap is provided above two adjacent stoppers, the upper end of the flap is hinged to the two stoppers, and the lower end of the flap abuts against the top surfaces of the two stoppers.

[0009] Through the above technical solution, the PLA straws are squeezed by the flap to ensure that a sufficient number of PLA straws remain between the two blocks. In this way, when the driving mechanism is used to drive the movable side plate to move, the movable side plate is not likely to bend the PLA straws between the two blocks.

[0010] Preferably, a contact switch is provided on the side wall of the fixed side plate, and the contact switch is electrically connected to the driving mechanism. When the flap touches the contact switch, the contact switch controls the driving mechanism to start operating.

[0011] The block located on the fixed side plate is a trigger block, and the trigger block is provided with a groove toward the side wall of the movable side plate. A sensing slider is provided in the groove, and the side of the sensing slider protrudes from the groove. A pressure switch is provided in the groove, and the pressure switch conflicts with the sensing slider. When the pressure value measured by the pressure switch is greater than a preset value, the pressure switch controls the driving mechanism to stop operating.

[0012] Through the above technical solution, when only a small number of PLA straws are placed on the guide side plate, the flap limits the PLA straws, placing them between the two blocks. As the number of PLA straws placed on the guide side plate increases, the flap is gradually lifted. When the flap touches the contact switch, the contact switch controls the drive mechanism to start operating, driving the movable side plate toward the fixed side plate. When the blocks on the fixed side plate and the blocks on the movable side plate both contact the PLA straws, the pressure value measured by the pressure switch exceeds the preset value, and the pressure switch controls the drive mechanism to stop operating, preventing the PLA straws from being bent. By providing the contact switch and pressure switch, the use of the above-mentioned PLA straw crystallizer becomes more convenient and quick.

[0013] Preferably, the driving mechanism includes a servo motor, a lead screw and a nut seat, the servo motor is fixedly connected to the top of the storage bottom plate, the lead screw nut is rotatably connected to the top of the storage bottom plate, the lead screw nut is connected to the output shaft of the servo motor through a coupling, the nut seat is threadedly connected to the lead screw nut, and the nut seat is fixedly connected to the movable side plate.

[0014] With this technical solution, the servo motor drives the screw through the coupling, which in turn drives the movable side plate via the nut seat. When the servo motor rotates forward, the movable side plate moves toward the fixed side plate, while when the servo motor rotates backward, the movable side plate moves away from the fixed side plate.

[0015] Preferably, the guide side plate includes a guide frame, a guide rotating plate and a limiting member. The guide frame is fixedly connected to the material storage bottom plate. A discharge port is provided through the guide frame. The guide rotating plate is rotatably connected to the discharge port. The limiting member is provided between the guide frame and the guide rotating plate to limit the guide rotating plate.

[0016] With the above technical solution, when PLA straws of different lengths need to be crystallized, the control limiter is disabled, and then the guide rotating plate is controlled to move from the discharge port to discharge the remaining unprocessed PLA straws in the storage bin.

[0017] Preferably, a limiting groove is provided on the inner wall of the discharge port, a sliding groove is provided on the side wall of the guide rotating plate, the sliding groove is opposite to the limiting groove, and a toggle groove is provided on the end face of the guide rotating plate away from the fixed side plate, the toggle groove is communicated with the sliding groove, the limiting member includes a spring fixedly connected to the inside of the sliding groove, a limiting block slidingly connected in the sliding groove, and a toggle block slidingly connected in the toggle groove, one end of the limiting block is fixedly connected to the spring, the other end of the limiting block protrudes from the notch of the sliding groove, and the toggle block is fixedly connected to the limiting block.

[0018] Through the above technical solution, when it is necessary to discharge the remaining unprocessed PLA straws in the storage bin, the limit block is driven away from the limit groove by the toggle block. When the limit block is moved out of the limit groove, the guide rotating plate can be controlled to rotate out of the discharge port.

[0019] Preferably, there are several movable side panels, and the several movable side panels are evenly distributed along the length direction of the storage bottom plate. The movable side panels away from the fixed side panels are connected to the output end of the driving mechanism. The storage bin also includes a connecting mechanism, which connects the fixed side panel and the several movable side panels to control the distance between the fixed side panel and the adjacent movable side panel and the distance between two adjacent movable side panels to always be the same.

[0020] This technical solution creates multiple chambers between the fixed side panels and the multiple movable side panels, allowing for simultaneous feeding of multiple PLA straws, thereby improving the efficiency of the PLA straw crystallizer. Connecting the movable side panels via a connecting mechanism eliminates the need to adjust the positions of the movable side panels individually, making the storage bin adjustment process more convenient and quicker.

[0021] Preferably, the connecting mechanism includes a connecting unit arranged on the fixed side panel and each of the movable side panels, the connecting unit includes a hinged rod 1 and a hinged rod 2, the middle of which is hinged to the fixed side panel or the movable side panel, the hinged rod 1 of the connecting unit is hinged to the hinged rod 2 of the adjacent connecting unit, and the hinged rod 2 of the connecting unit is hinged to the hinged rod 1 of the adjacent connecting unit.

[0022] Through the above technical solution, when the movable side panel moves, the angle between the hinge rod 1 and the hinge rod 2 changes, and different connection units influence each other, which can ensure that the distance between two adjacent movable side panels is always the same.

[0023] Preferably, a guide groove is provided on the top surface of the material storage bottom plate, and a guide block is provided on the bottom surface of the movable side plate, and the guide block is slidably connected to the guide groove.

[0024] Through the above technical solution, the guide block and the guide groove cooperate with each other to limit and guide the movable side plate, so that the movable side plate is not easily offset during the sliding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of an embodiment;

[0026] Figure 2 It is a structural diagram of the storage silo;

[0027] Figure 3 for Figure 2 A magnified view of part A;

[0028] Figure 4 It is a cross-sectional schematic diagram of a storage silo;

[0029] Figure 5 for Figure 4 A magnified view of part B;

[0030] Figure 6 A schematic diagram of the structure of a transfer conveyor belt;

[0031] Figure 7 for Figure 6 Magnified view of part C;

[0032] Figure 8 It is a structural diagram of the rotary drive mechanism.

[0033] Figure numerals: 1, frame; 2, heating chamber; 3, feed port; 4, discharge port; 5, transfer conveyor belt; 51, flexible frame; 511, support unit; 5111, driving sprocket; 5112, driven sprocket; 5113, support chain; 52, transfer drive mechanism; 521, rotation drive motor; 522, transfer drive reducer; 53, rotation drive mechanism; 531, driving roller; 5311, connecting part 1; 5312, executing part 1; 532, driven roller; 5321, connecting part 2; 5322, executing part 2; 533, conveyor belt; 534, rotation drive element; 5341, rotation drive motor; 5342, rotation drive reducer; 6, storage bin; 61, storage bottom plate; 62, guide side plate; 621. Guide frame; 622. Guide rotating plate; 623. Limiting member; 6231. Spring; 6232. Limiting block; 6233. Toggle block; 63. Fixed side plate; 64. Movable side plate; 65. Driving mechanism; 651. Servo motor; 652. Lead screw; 653. Nut seat; 66. Connecting mechanism; 661. Articulated rod 1; 662. Articulated rod 2; 7. Feeding hole; 8. Stop block; 9. Flip plate; 10. Contact switch; 11. Trigger block; 12. Groove; 13. Induction slider; 14. Pressure switch; 15. Discharge port; 16. Limiting groove; 17. Sliding groove; 18. Toggle groove; 19. Guide groove; 20. Guide block; 21. Conveyor roller; 22. Storage cavity; 23. Main connecting shaft; 24. Secondary connecting shaft. Implementation Method

[0034] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0035] A PLA straw crystallizer, such as Figures 1 to 8 As shown, it includes a frame 1 and a transfer conveyor belt 5.

[0036] The frame 1 houses a heating chamber 2, with a heating device mounted on top. In this embodiment, the heating device comprises a fan and a heating wire. The fan and heating wire work together to blow hot air toward a transfer conveyor 5, heating the PLA straws on the conveyor 5 and causing them to crystallize. The frame 1 has a feed inlet 3 and a discharge outlet 4 at each end, both of which are connected to the heating chamber 2. The transfer conveyor 5 is positioned within the heating chamber 2, with its ends protruding from the feed inlet 3 and discharge outlet 4, respectively.

[0037] A storage bin 6 is located at the feed port 3 and is positioned above the transfer conveyor 5 to supply PLA straws to be processed. The storage bin 6 includes a storage base 61, guide side panels 62, fixed side panels 63, movable side panels 64, a drive mechanism 65, and a connecting mechanism 66.

[0038] The storage base plate 61 is fixedly connected to the frame 1. A feeding hole 7 is provided through the storage base plate 61, and the feeding hole 7 is vertically opposite to the transfer conveyor 5. A guide groove 19 is provided on the top surface of the storage base plate 61, and the guide groove 19 is provided in a direction perpendicular to the transfer conveyor 5.

[0039] The guide side plate 62 is fixed to the side of the storage bottom plate 61 away from the feed port 3, and the guide side plate 62 is arranged at an angle. The guide side plate 62 includes a guide frame 621, a guide rotating plate 622, and a limiter 623. The guide frame 621 is fixedly connected to the storage bottom plate 61. The guide frame 621 is provided with a discharge port 15, and a limiter slot 16 is provided on the inner wall of the discharge port 15. The guide rotating plate 622 is rotatably connected to the discharge port 15. The side wall of the guide rotating plate 622 is provided with a sliding slot 17, which is opposite to the limiter slot 16. The end surface of the guide rotating plate 622 away from the fixed side plate 63 is provided with a toggle slot 18, which is connected to the sliding slot 17. The limiter 623 is provided between the guide frame 621 and the guide rotating plate 622 to limit the guide rotating plate 622. The limiting member 623 includes a spring 6231 fixedly connected to the interior of the sliding groove 17, a limiting block 6232 slidably connected to the sliding groove 17, and a toggle block 6233 slidably connected to the toggle groove 18. One end of the limiting block 6232 is fixedly connected to the spring 6231, and the other end of the limiting block 6232 protrudes from the notch of the sliding groove 17. The toggle block 6233 is fixedly connected to the limiting block 6232.

[0040] The fixed side plate 63 is fixedly connected to the edge of the material storage bottom plate 61 , and the edge of the fixed side plate 63 is engaged with the edge of the guide side plate 62 .

[0041] The movable side plate 64 is parallel to the fixed side plate 63. There are a plurality of movable side plates 64, and the plurality of movable side plates 64 are evenly distributed along the length direction of the storage bottom plate 61. The bottom surface of the movable side plate 64 is provided with a guide block 20, which is slidably connected to the guide groove 19.

[0042] The sidewalls of both the fixed side panel 63 and the movable side panel 64 are equipped with stoppers 8, which are arranged parallel to and in close contact with the guide side panel 62. A flap 9 is positioned above each of the adjacent stoppers 8. The upper ends of the flaps 9 are hinged to the two stoppers 8, and the lower ends of the flaps 9 contact the top surfaces of the two stoppers 8. A contact switch 10 is also installed on the sidewall of the fixed side panel 63. The contact switch 10 is electrically connected to the drive mechanism 65. When the flap 9 contacts the contact switch 10, the contact switch 10 activates the drive mechanism 65. The block 8 located on the fixed side plate 63 is a trigger block 11. The trigger block 11 is provided with a groove 12 on the side wall facing the movable side plate 64. A sensing slider 13 is provided in the groove 12. The side of the sensing slider 13 protrudes from the groove 12. A pressure switch 14 is provided in the groove 12. The pressure switch 14 conflicts with the sensing slider 13. When the pressure value measured by the pressure switch 14 is greater than the preset value, the pressure switch 14 controls the driving mechanism 65 to stop operating.

[0043] The drive mechanism 65 includes a servo motor 651, a lead screw 652, and a nut seat 653. The servo motor 651 is fixedly connected to the top of the storage base 61, the lead screw 652 and the nut are rotatably connected to the top of the storage base 61, the lead screw 652 and the nut are connected to the output shaft of the servo motor 651 through a coupling, the nut seat 653 is threadedly connected to the lead screw 652 and the nut seat 653 is fixedly connected to the movable side plate 64 away from the fixed side plate 63.

[0044] The connecting mechanism 66 connects the fixed side panel 63 and the movable side panels 64 to maintain the same distance between the fixed side panel 63 and adjacent movable side panels 64, as well as the distance between two adjacent movable side panels 64. The connecting mechanism 66 includes connecting units disposed on the fixed side panel 63 and each movable side panel 64. The connecting units include a first hinge rod 661 and a second hinge rod 662, each hinged at its center to the fixed side panel 63 or the movable side panel 64. The first hinge rod 661 of the connecting unit is hinged to the second hinge rod 662 of the adjacent connecting unit, and the second hinge rod 662 of the connecting unit is hinged to the first hinge rod 661 of the adjacent connecting unit.

[0045] The transfer conveyor 533 includes a flexible frame 51 , a transfer drive mechanism 6552 and a rotation drive mechanism 6553 .

[0046] The flexible frame 51 comprises two symmetrically arranged support units 511. Each support unit 511 includes a driving sprocket 5111, a driven sprocket 5112 symmetrically arranged with the driving sprocket 5111, and a support chain 5113 connecting the driving and driven sprockets 5111 and 5112. A primary connecting shaft 23 is connected between the two opposing driving sprockets 5111, and a secondary connecting shaft is connected between the two opposing driven sprockets 5112. Several conveyor rollers 21 are positioned between the two support chains 5113 and are rotatably connected to the rotational shafts of the support chains 5113. A storage cavity 22 for PLA straws is formed between adjacent conveyor rollers 21. The minimum width of the storage cavity 22 is greater than the diameter of the PLA straw.

[0047] The transfer drive mechanism 6552 is connected to the flexible frame 51 and is used to drive the flexible frame 51 to move along its length. The transfer drive mechanism 6552 includes a transfer drive motor 521 and a transfer drive reducer 522. The output end of the transfer drive motor 521 is connected to the input end of the transfer drive reducer 522, and the output end of the transfer drive reducer 522 is connected to the main connecting shaft 23.

[0048] The rotary drive mechanism 6553 contacts the conveyor rollers 21, driving the conveyor rollers 21 to rotate circumferentially. The rotary drive mechanism 6553 is positioned between the conveyor rollers 21. The rotary drive mechanism 6553 includes a driving roller 531, a driven roller 532 symmetrically arranged with the driving roller 531, a transmission belt connecting the driving roller 531 and the driven roller 532, and a rotary drive element 534 connecting the driving roller 531. The driving roller 531 includes a first connecting portion 5311 and first actuators 5312 symmetrically located at both ends of the first connecting portion 5311. The driven roller 532 includes a second connecting portion 5321 and second actuators 5322 symmetrically located at both ends of the second connecting portion 5321. Two transmission belts connect the first actuator 5312 and the second actuator 5322. The transmission belt contacts the upper conveyor roller 21, and the rotary drive element 534 drives the driving roller 531 to rotate. The rotation driving element 534 includes a rotation driving motor 5341521 and a rotation driving reducer 5342 . The output end of the rotation driving motor 5341521 is connected to the input end of the rotation driving reducer 5342 , and the output end of the rotation driving reducer 5342 is connected to the active roller 531 .

[0049] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A PLA straw crystallization machine, comprising a frame (1) and a transfer conveyor (5), wherein a heating chamber (2) is provided inside the frame (1), a feed port (3) and a discharge port (4) are respectively provided at both ends of the frame (1), wherein the feed port (3) and the discharge port (4) are both connected to the heating chamber (2), the transfer conveyor (5) is provided in the heating chamber (2), and the two ends of the transfer conveyor (5) protrude from the feed port (3) and the discharge port (4), respectively, a storage bin (6) is provided at the feed port (3), and the storage bin (6) is located above the transfer conveyor (5), and the machine is characterized in that: The storage bin (6) comprises a storage bottom plate (61), a guide side plate (62), a fixed side plate (63), a movable side plate (64) and a driving mechanism (65). The storage bottom plate (61) is fixedly connected to the frame (1). A feeding hole (7) is provided through the storage bottom plate (61), and the feeding hole (7) is vertically opposite to the transfer conveyor belt (5). The guide side plate (62) is fixed to the side of the storage bottom plate (61) away from the feed port (3), and the guide side plate (62) is inclined. The fixed side plate (63) is fixed. The movable side plate (64) is connected to the edge of the material storage bottom plate (61), and the edge of the fixed side plate (63) is engaged with the edge of the guide side plate (62). The movable side plate (64) is slidably connected to the top surface of the material storage bottom plate (61), and the movable side plate (64) is parallel to the fixed side plate (63). The driving mechanism (65) is fixedly connected to the top surface of the material storage bottom plate (61), and the output end of the driving mechanism (65) is connected to the movable side plate (64) to drive the movable side plate (64) to approach or move away from the fixed side plate (63).

2. A PLA straw crystallizer according to claim 1, characterized in that: The side walls of the fixed side plate (63) and the side walls of the movable side plate (64) are both provided with a stopper (8), and the stopper (8) is arranged in a direction parallel to the guide side plate (62), and the stopper (8) is tightly attached to the guide side plate (62).

3. A PLA straw crystallizer according to claim 2, characterized in that: A flap (9) is provided above the two adjacent stoppers (8), the upper end of the flap (9) is hinged to the two stoppers (8), and the lower end of the flap (9) abuts against the top surfaces of the two stoppers (8).

4. A PLA straw crystallizer according to claim 3, characterized in that: A contact switch (10) is provided on the side wall of the fixed side plate (63), and the contact switch (10) is electrically connected to the driving mechanism (65). When the flip plate (9) touches the contact switch (10), the contact switch (10) controls the driving mechanism (65) to start operating. The stopper (8) on the fixed side plate (63) is a trigger block (11). The trigger block (11) is provided with a groove (12) on the side wall facing the movable side plate (64). A sensing slider (13) is provided in the groove (12). The side of the sensing slider (13) protrudes from the groove (12). A pressure switch (14) is provided in the groove (12). The pressure switch (14) contacts the sensing slider (13). When the pressure value measured by the pressure switch (14) is greater than a preset value, the pressure switch (14) controls the driving mechanism (65) to stop operating.

5. The PLA straw crystallizer according to claim 1, wherein: The driving mechanism (65) includes a servo motor (651), a lead screw (652) and a nut seat (653), wherein the servo motor (651) is fixedly connected to the top of the material storage bottom plate (61), the lead screw (652) and the nut are rotatably connected to the top of the material storage bottom plate (61), the lead screw (652) and the nut are connected to the output shaft of the servo motor (651) through a coupling, the nut seat (653) is threadedly connected to the lead screw (652) and the nut seat (653) is fixedly connected to the movable side plate (64).

6. A PLA straw crystallizer according to claim 1, characterized in that: The guide side plate (62) includes a guide frame (621), a guide rotating plate (622) and a limiting member (623); the guide frame (621) is fixedly connected to the material storage bottom plate (61); a discharge port (15) is provided through the guide frame (621); the guide rotating plate (622) is rotatably connected to the discharge port (15); and the limiting member (623) is provided between the guide frame (621) and the guide rotating plate (622) for limiting the guide rotating plate (622).

7. A PLA straw crystallizer according to claim 6, characterized in that: A limiting groove (16) is provided on the inner wall of the discharge port (15), a sliding groove (17) is provided on the side wall of the guide rotating plate (622), the sliding groove (17) is opposite to the limiting groove (16), and a toggle groove (18) is provided on the end surface of the guide rotating plate (622) away from the fixed side plate (63), the toggle groove (18) is connected to the sliding groove (17), and the limiting member (623) includes a fixed connection to the sliding groove (1 7) an internal spring (6231), a limit block (6232) slidably connected to the sliding groove (17), and a toggle block (6233) slidably connected to the toggle groove (18), one end of the limit block (6232) is fixedly connected to the spring (6231), the other end of the limit block (6232) protrudes from the notch of the sliding groove (17), and the toggle block (6233) is fixedly connected to the limit block (6232).

8. The PLA straw crystallizer according to claim 1, wherein: There are a plurality of movable side plates (64), and the plurality of movable side plates (64) are evenly distributed along the length direction of the storage bottom plate (61). The movable side plates (64) away from the fixed side plates (63) are connected to the output end of the driving mechanism (65). The storage bin (6) also includes a connecting mechanism (66). The connecting mechanism (66) connects the fixed side plates (63) and the plurality of movable side plates (64) to control the distance between the fixed side plates (63) and the adjacent movable side plates (64) and the distance between two adjacent movable side plates (64) to be always the same.

9. A PLA straw crystallizer according to claim 8, characterized in that: The connecting mechanism (66) includes a connecting unit arranged on the fixed side panel (63) and each of the movable side panels (64), and the connecting unit includes a hinge rod 1 (661) and a hinge rod 2 (662) whose middle part is hinged to the fixed side panel (63) or the movable side panel (64), the hinge rod 1 (661) of the connecting unit is hinged to the hinge rod 2 (662) of the adjacent connecting unit, and the hinge rod 2 (662) of the connecting unit is hinged to the hinge rod 1 (661) of the adjacent connecting unit.

10. The PLA straw crystallizer according to claim 1, characterized in that: A guide groove (19) is provided on the top surface of the material storage bottom plate (61), and a guide block (20) is provided on the bottom surface of the movable side plate (64). The guide block (20) is slidably connected to the guide groove (19).

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