PET bottle preform production equipment and process

Abstract

The invention relates to the technical field of PET bottle preform production, in particular to PET bottle preform production equipment and a PET bottle preform production process. The PET bottle preform production equipment comprises a supporting plate, a first frame body and a second frame body are arranged on the two sides of the upper portion of the supporting plate respectively, and a plastic extruding machine is arranged above the first frame body; the heating assembly is arranged on the outer surface of the plastic extruding machine; the driving assembly is arranged above the second frame body, and the driving assembly is used for driving the forming mold to be close to or away from the discharging mold for mold building forming; and the discharging assembly is arranged in the supporting plate and located below the second frame body. Compared with the prior art, the heating assembly is arranged to be matched with the mixing block, continuous plasticizing and stirring of PET raw materials are achieved in the extrusion molding process through the combined effect of the heating assembly and the mixing block, the uniformity and consistency of bottle preform raw materials are improved, it is ensured that formed bottle preforms have higher transparency, strength and size precision, the deviation of the finished product rate is reduced, and the production efficiency is improved. And the extrusion molding quality and the production efficiency are obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of PET preform production, and particularly to a PET preform production device and process. Background Art

[0002] PET preforms are semi-finished products used to manufacture plastic bottles. They are small bottle blanks made of polyethylene terephthalate (PET) material through injection molding or extrusion molding processes. They are shaped like test tubes, with the mouth part already formed, and the bottle body needs to be stretched into the final bottle through subsequent heating and blow molding processes. PET preforms have excellent transparency, pressure resistance, and impact resistance, and are the main raw materials for producing beverage bottles, mineral water bottles, cosmetic containers, etc. Inevitably, scrap materials, defective products, and waste preforms will be generated during preform production and subsequent processing. Therefore, it is particularly crucial to establish an efficient plastic waste recycling system. The waste materials are crushed, cleaned, and dried through an on-line crushing and recycling system, and then made into high-quality recycled PET pellets through a recycling granulation process. These pellets can be mixed with new materials in proportion or used alone in the manufacture of secondary products, which not only greatly reduces raw material consumption and production costs, but also realizes resource recycling and meets environmental protection emission standards, further enhancing the sustainable development competitiveness of enterprises.

[0003] In the prior art, in the bottle preform automatic production and tail-cutting machine of the Chinese patent document with the publication number of CN104742331B, it is proposed that by setting a manipulator on an injection molding machine and a shearing device on one side of the injection molding machine, the preforms can be automatically taken out, automatically tail-cut, and automatically recycled after being produced by the injection molding machine, replacing traditional manual operations, greatly improving production efficiency and ensuring product quality and uniformity. At the same time, it can avoid potential safety hazards existing in manual operations. However, similar to the traditional method, the heating method in traditional production equipment is prone to local overheating or excessive temperature difference in the extruder, resulting in uneven heating of the PET raw material, incomplete melting of some raw materials, affecting the forming quality of the preform, and prone to poor transparency or poor mechanical properties. Moreover, the heated molten PET raw material is prone to stratification or accumulation of unmelted particles during the flowing process, resulting in uneven wall thickness or rough surface of the preform, reducing the uniformity and yield of the preform. In addition, the formed preforms usually directly fall onto a conveyor belt or into a container. Due to the high temperature of the preforms and the action of gravitational acceleration, they are prone to deformation or breakage, increasing the scrap rate and affecting the appearance and dimensional accuracy of the products. Therefore, the present application discloses a PET preform production device and process. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a PET preform production device and process to solve the problems that the PET raw materials are unevenly heated, and the molten PET raw materials after heating are prone to stratification or accumulation of unmelted particles during the flow process, resulting in uneven wall thickness or rough surface of the preform, and the preform is prone to deformation or breakage due to the high temperature and the action of gravitational acceleration during the downward dropping process.

[0005] Based on the above object, the present invention provides a PET preform production device, including a support plate. On both sides above the support plate, a first frame body and a second frame body are respectively arranged. Above the first frame body, an extrusion machine is arranged. On one side of the extrusion machine, a feed inlet is arranged. On one side of the extrusion machine, a reduction motor for driving the extrusion machine is arranged. At one end of the second frame body, a fixed plate is fixedly installed. At the end of the fixed plate away from the extrusion machine, a discharge die is arranged. One side of the discharge die is communicated with the extrusion outlet of the extrusion machine. On both sides of the bottom of the second frame body, slide rails are arranged. On the slide rails, sliding plates are slidably installed. At one end of the two sliding plates, a moving plate is jointly arranged. On the side of the moving plate close to the fixed plate, a forming die is arranged; A heating component, which is arranged on the outer surface of the extrusion machine. The heating component includes an air inlet module and a diversion module. The air inlet module is used to output hot air for transportation. The diversion module is used to drive the hot air generated by the air inlet module for guiding; A driving component, which is arranged above the second frame body. The driving component is used to drive the forming die to approach or move away from the discharge die for die casting and forming; A discharge component, which is arranged inside the support plate and below the second frame body. The discharge component is used to receive the preform body produced by the discharge die and the forming die and convey it outwards.

[0006] Preferably, the air inlet module includes a plurality of heating cavities sleeved outside the extrusion machine, and a plurality of hot air blowers fixedly installed at the top end of the support plate. The diversion module includes an air inlet cavity fixedly installed below the heating cavity. Between the plurality of hot air blowers and the plurality of air inlet cavities, a plurality of air inlet pipes are arranged in communication.

[0007] Preferably, one end of the air inlet pipe close to the air inlet cavity is provided with a metal connector. At the bottom end of the air inlet cavity, an air inlet adapted to the metal connector is opened. On one side of the top end of the air inlet cavity, an air outlet is also provided and communicated with the inside of the heating cavity.

[0008] Preferably, a vertical plate is fixedly installed in the middle of the bottom end inside the air inlet cavity. On one side of the bottom end inside the air inlet cavity, a first guide plate is also fixedly installed. The air inlet is located between the vertical plate and the first guide plate. The cross-section of the top end of the first guide plate is arranged in an inverted "V" shape. On one side of the top end inside the air inlet cavity, a second guide plate is fixedly installed. The second guide plate is located directly above the air inlet, and the second guide plate is arranged in an obtuse angle shape.

[0009] Preferably, a third guide plate is also fixedly installed on one side inside the air inlet cavity. The third guide plate is arranged in an inclined shape. One side of the third guide plate cooperates with the second guide plate. The other side of the third guide plate is located at the bottom of the air outlet. A plurality of flow guide plates are also arranged on the upper surface of the third guide plate. All the flow guide plates are arranged in an inverted "V" shape, and the plurality of flow guide plates are arranged in a nested doll shape.

[0010] Preferably, a plurality of mixing blocks are arranged at the bottom of the extruder. A plurality of mixing grooves are equidistantly arranged on the upper surface of the mixing blocks. A plurality of inclined return grooves are staggered on both sides of the mixing grooves. One end of the return groove is communicated with the mixing groove, and the other end of the return groove is set to be concave semicircular to achieve the return effect. A matching return column is arranged inside each return groove. One end of the return column is arranged in an inclined shape parallel to the mixing groove, and the other end of the return column is set to be a convex semicircle.

[0011] Preferably, the driving assembly includes a connecting frame fixedly installed on one side of the second frame body. Servo motors are fixedly installed on both the upper and lower sides of the connecting frame. The output ends of the servo motors are fixedly connected with driving belt pulleys. Threaded rods are rotatably installed on both sides of the second frame body. One end of the threaded rod is fixedly connected with a driven gear. Belts are sleeved between the two driving belt pulleys and the two driven gears respectively. The two threaded rods are respectively threadedly connected with both sides of the moving plate.

[0012] Preferably, a fixed block is fixedly installed in the middle of the bottom of the second frame body. A first shielding plate is arranged on the top of the fixed block to be adapted to the bottom of the moving plate, which is used to prevent the preform body from falling backward to the rear of the moving plate before entering the discharging assembly. A rotating shaft is rotatably installed at the bottom of the fixed block. One side of the bottom of the rotating shaft is fixedly connected with a second shielding plate, and a torsion spring is arranged at the connection between the rotating shaft and the fixed block. The second shielding plate is used to shield the rear of the discharging assembly.

[0013] Preferably, the discharging assembly includes a conveying hopper fixedly installed inside the support plate. The conveying hopper is arranged in an obtuse angle shape. A conveyor belt is provided at the bottom of the conveying hopper. A number of grooves for increasing friction are formed on the conveyor belt. A conveyor belt motor for driving the conveyor belt is arranged on one side of the conveying hopper. A number of partition plates are arranged on the outer surface of the conveyor belt. A first air intake frame is vertically arranged on one side of the conveying hopper. The top end of the first air intake frame is fixedly connected to the fixed block. A number of first air outlet pipes are arranged on the first air intake frame. A number of first nozzles are arranged on the first air outlet pipes. The angles of the first nozzles are arranged to be inclined upward. A second air intake frame is also inclinedly arranged on one side of the conveying hopper. A number of second air outlet pipes are arranged on the second air intake frame. A number of second nozzles are arranged on each of the second air outlet pipes. A number of the second nozzles are arranged to be inclined towards the conveyor belt. A number of the first air intake frames and the second air intake frame are connected to an external air source.

[0014] This application also discloses a PET preform production process, which is applied to the above PET preform production equipment and includes the following steps: S1: After starting the equipment, the PET raw material enters the extruder. The air intake module and the diversion module of the heating assembly uniformly heat the extruder to gradually soften and melt the PET raw material. S2: The molten PET raw material flows into the discharging die from the extrusion outlet. The servo motor drives the forming die to slide along the slide rail and gradually approaches the discharging die to realize the molding of the preform. S3: After molding, the die opens, and the preform drops above the conveying hopper. The nozzles of the first air intake frame spray cooling air flow on the preform to prevent the preform from deforming at high temperature. At the same time, the preform is lifted and slowly guided to fall. S4: The nozzles of the second air intake frame spray air on the conveyor belt to form an air flow counterflush with the first nozzles, further slowing down the falling speed of the preform and enabling the preform to smoothly fall into the gaps between the partition plates on the conveyor belt. S5: The conveyor belt motor drives the conveyor belt to move slowly. The preforms are arranged in an orderly manner under the partition plates, preventing stacking and collision, and ensuring the stable conveyance of the preforms to the next process.

[0015] The beneficial effects of the present invention: 1. This PET preform production equipment and process, by setting up a heating component in cooperation with a mixing block, the heating component through the cooperation of a hot air blower and an air inlet cavity, ensures that the outer wall of the extruder is evenly heated, avoids local overheating or excessive temperature difference, improves the melting consistency of PET raw materials. The vertical plate and the inverted "V" - shaped first guiding plate structure set in the air inlet cavity make the hot air evenly dispersed, prevent air flow disorder, improve the heating efficiency and stability, reduce the poor flow of raw materials caused by temperature difference. The setting of the mixing block further optimizes the mixing process of the molten PET raw materials. The staggered arrangement of the mixing tank and the reflux tank makes the molten raw materials form a reflux and multiple stirrings inside the cavity. The reflux columns in the reflux tank guide the raw material flow through the inclined plane and semi - circular convex structure, enhance the fluidity and uniformity of the melt, avoid the accumulation of unmelted particles, effectively reduce the delamination phenomenon. The combined action of the heating component and the mixing block enables the PET raw materials to achieve continuous plasticization and stirring during the extrusion process, improves the uniformity and consistency of the preform raw materials, ensures that the formed preforms have higher transparency, strength and dimensional accuracy, reduces the deviation of the finished product rate, and significantly improves the quality and production efficiency of extrusion molding.

[0016] 2. This PET preform production equipment and process, by setting up a discharging component, the conveyor belt at the bottom of the conveying hopper is driven by a conveyor belt motor. The preforms are arranged orderly at intervals of the partition plate, preventing the preforms from stacking or colliding and being damaged, ensuring the neat arrangement of the preforms, improving the conveying efficiency. The nozzles on the first air inlet rack and the second air inlet rack cool the preforms and lift them with air flow, reducing the risk of deformation during the falling process of the preforms. The first nozzle sprays air flow from below to hold the preforms and make them fall slowly, while the second nozzle sprays air flow from above to form a counter - impact, slowing down the falling speed of the preforms, ensuring that the preforms smoothly fall into the partitioned area on the conveyor belt, further preventing the preforms from colliding with each other or rolling and being damaged. The overall structure realizes a stable transition of the preforms from molding to conveying, improves the automation degree of the production line and the finished product rate of the preforms, and provides a stable and reliable preform conveying guarantee for the subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a three - dimensional structure schematic diagram of the present invention; Figure 2 It is an internal structure schematic diagram of the present invention; Figure 3 It is a partial plane structure schematic diagram of the present invention; Figure 4 It is a structure schematic diagram of the heating component of the present invention; Figure 5 Schematic diagram of the diversion module structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of part A in the present invention; Figure 7 Internal plane structure schematic diagram of the diversion module of the present invention; Figure 8 Schematic diagram of the bottom structure of the extruder of the present invention; Figure 9 Schematic diagram of the mixing block structure of the present invention; Figure 10 Schematic diagram of the mold structure of the present invention; Figure 11 Cross-sectional view schematic diagram of the mold of the present invention; Figure 12 Schematic diagram of the structure of the discharging assembly of the present invention; Figure 13 For the present invention Figure 2 Enlarged schematic diagram of part B in the present invention; Figure 14 Schematic diagram of the fixed block and the shielding plate structure of the present invention.

[0019] The markings in the figure are: 1. Support plate; 2. First frame; 3. Second frame; 4. Extruder; 5. Feed inlet; 6. Heating cavity; 7. Air inlet cavity; 8. Hot air blower; 9. Air inlet pipe; 10. Metal connector; 11. Air inlet; 12. First guide plate; 13. Second guide plate; 14. Third guide plate; 15. Diversion plate; 16. Air outlet; 17. Reduction motor; 18. Fixed plate; 19. Moving plate; 20. Mixing block; 21. Mixing tank; 22. Return groove; 23. Return column; 24. Discharging mold; 25. Forming mold; 26. Slide rail; 27. Sliding plate; 28. Connecting frame; 29. Servo motor; 30. Lead screw; 31. Driven gear; 32. Fixed block; 33. First shielding plate; 34. Second shielding plate; 35. Rotating shaft; 36. Transfer hopper; 37. Conveyor belt; 38. Conveyor belt motor; 39. Partition plate; 40. Groove; 41. First air intake frame; 42. First air outlet pipe; 43. First spray head; 44. Second air intake frame; 45. Second air outlet pipe; 46. Second spray head. Detailed implementation manners

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0021] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] As Figures 1 to 14 shown, a PET preform production device includes a support plate 1. On both sides above the support plate 1, a first frame 2 and a second frame 3 are respectively arranged. Above the first frame 2, an extrusion machine 4 is arranged. On one side of the extrusion machine 4, a feed inlet 5 is arranged. On one side of the extrusion machine 4, a reduction motor 17 for driving the extrusion machine 4 is arranged. At one end of the second frame 3, a fixed plate 18 is fixedly installed. At one end of the fixed plate 18 away from the extrusion machine 4, a discharge die 24 is arranged. One side of the discharge die 24 is communicated with the extrusion outlet of the extrusion machine 4. On both sides of the bottom of the second frame 3, slide rails 26 are arranged. On the slide rails 26, sliding plates 27 are slidably installed. At one end of the two sliding plates 27, a moving plate 19 is jointly arranged. On the side of the moving plate 19 close to the fixed plate 18, a forming die 25 is arranged; a heating assembly, which is arranged on the outer surface of the extrusion machine 4. The heating assembly includes an air inlet module and a diversion module. The air inlet module is used to output hot air for transportation, and the diversion module is used to drive the hot air generated by the air inlet module for guiding; a driving assembly, which is arranged above the second frame 3. The driving assembly is used to drive the forming die 25 to approach or move away from the discharge die 24 for die casting; a discharging assembly, which is arranged inside the support plate 1 and below the second frame 3. The discharging assembly is used to receive the preform body produced by the discharge die 24 and the forming die 25 and convey it outwards. Among them, the driving assembly includes a connecting frame 28 fixedly installed on one side of the second frame 3. On both the upper and lower sides of the connecting frame 28, servo motors 29 are fixedly installed. The output ends of the servo motors 29 are fixedly connected with driving belt pulleys. On both sides of the second frame 3, lead screws 30 are rotatably installed. One end of the lead screw 30 is fixedly connected with a driven gear 31. Belts are sleeved between the two driving belt pulleys and the two driven gears 31 respectively. The two lead screws 30 are respectively threadedly connected with both sides of the moving plate 19; After starting the device, the PET raw material is heated and extruded by the extruder 4. The inlet air module and the diversion module of the heating component are used to uniformly heat the extruder 4 to ensure that the temperature of the extruded PET material is consistent. The extruded PET material flows into the interior of the discharge die 24 through the extrusion outlet. The forming die 25 slides along the slide rail 26 driven by the servo motor 29 and gradually approaches the discharge die 24 to realize the pressing and molding of the preform. After the preform is formed, the preform is pushed out by the synchronous cooperation of the discharge die 24 and the forming die 25. The preform body is automatically transported to the outside of the device through the discharge component to realize continuous production. During the whole process, the closing position and the forming speed of the die are controlled by the servo motor 29 to ensure accurate preform dimensions and consistent shapes, improve the preform quality, and meet the requirements of batch production. Among them, the heating component uniformly heats the extruder 4 through the inlet air module and the diversion module to ensure that the extruded PET material is evenly heated, which helps to improve the forming quality of the preform, reduce material defects, and improve the transparency and strength of the preform. The driving component is driven by the servo motor 29. Through the cooperation of the driving pulley and the driven gear 31, the lead screw 30 is driven to rotate, so that the moving plate 19 and the forming die 25 smoothly approach or move away from the discharge die 24, which not only improves the accuracy of die closing, but also realizes the precise control of the preform thickness and shape, and improves the preform consistency. The discharge component is arranged inside the support plate 1, automatically receives the preform and transports it outwards, realizes the continuity and automation of preform production, reduces the manual operation link, improves the production efficiency, and meets the requirements of large-scale production.

[0023] Such as Figures 2 to 7As shown in the figure, the air inlet module includes several heating cavities 6 sleeved outside the extruder 4, and several hot air blowers 8 fixedly installed at the top end of the support plate 1. The air guiding module includes an air inlet cavity 7 fixedly installed below the heating cavity 6. There are several air inlet pipes 9 connecting and communicating between the several hot air blowers 8 and the several air inlet cavities 7. One end of the air inlet pipe 9 close to the air inlet cavity 7 is provided with a metal connector 10. The bottom end of the air inlet cavity 7 is provided with an air inlet 11 adapted to the metal connector 10. One side of the top end of the air inlet cavity 7 is also provided with an air outlet 16 communicating with the inside of the heating cavity 6. A vertical plate is fixedly installed in the middle of the bottom end inside the air inlet cavity 7. A first guiding plate 12 is also fixedly installed on one side of the bottom end inside the air inlet cavity 7. The air inlet 11 is located between the vertical plate and the first guiding plate 12. The cross section of the top end of the first guiding plate 12 is arranged in an inverted "V" shape. A second guiding plate 13 is fixedly installed on one side of the top end inside the air inlet cavity 7. The second guiding plate 13 is located directly above the air inlet 11. The second guiding plate 13 is arranged in an obtuse angle shape. A third guiding plate 14 is also fixedly installed on one side inside the air inlet cavity 7. The third guiding plate 14 is arranged in an inclined shape. One side of the third guiding plate 14 cooperates with the second guiding plate 13. The other side of the third guiding plate 14 is located at the bottom of the air outlet 16. The upper surface of the third guiding plate 14 is also provided with several guiding plates 15. The several guiding plates 15 are all arranged in an inverted "V" shape, and the several guiding plates 15 are arranged in a nested doll shape; After starting the hot air blower 8, the hot air is transported to the air inlet cavity 7 through the air inlet pipe 9. The air inlet 11 of the air inlet cavity 7 is connected to the air inlet pipe 9 through the metal connector 10. After the hot air enters the air inlet cavity 7, it is guided and shunted by the vertical plate and the first guiding plate 12, and is evenly dispersed to the left and right along the inverted "V" shaped structure. The hot air continuously rises in the cavity, and after being reflected by the second guiding plate 13, it enters the heating cavity 6, and the outer wall of the extruder 4 is evenly heated through the heating cavity 6, realizing the continuous heating and softening of the PET raw material. During the heating process, the hot air circulates in the cavity to ensure uniform heating of the extruder 4, improve the stability and forming quality of the extrusion process until the PET material reaches the best softening state and completes the heating link. There are a vertical plate and a first guiding plate 12 inside the air inlet cavity 7. After the air flow enters the cavity, it is guided and shunted to both sides by the inverted "V" shaped guiding plate, effectively preventing the hot air from concentrating inside the cavity, ensuring that the air flow is evenly distributed inside the heating cavity 6, improving the heating stability, avoiding local temperature difference. The second guiding plate 13 is arranged directly above the air inlet 11, and its obtuse angle structure can reflect or guide the rising air flow, preventing the air flow from directly flowing back to the air inlet 11, reducing the load of the hot air blower 8, ensuring the consistent direction of the hot air flow, and further improving the heating efficiency and stability.

[0024] As Figure 1 、 Figure 8 、 Figure 9As shown in the figure, several mixing blocks 20 are provided at the bottom of the extruder 4. A number of mixing grooves 21 are equidistantly arranged on the upper surface of the mixing block 20. On both sides of the mixing groove 21, several inclined return grooves 22 are staggered. One end of the return groove 22 is communicated with the mixing groove 21, and the other end of the return groove 22 is set to be concave and semicircular to achieve the return effect. A matching return column 23 is arranged inside each return groove 22. One end of the return column 23 is inclined and parallel to the mixing groove 21, and the other end of the return column 23 is set to be a semicircular shape protruding outwards; After the extruder 4 is started, the PET raw material gradually melts under the action of the heating component and flows downward along the cavity of the extruder 4. The molten PET raw material enters the mixing groove 21 on the surface of the mixing block 20 and enters the staggered return grooves 22 under the action of gravity and flow pressure. The return column 23 inside the return groove 22 guides the raw material to flow back to the mixing groove 21 through its inclined surface and semicircular convex structure, realizing continuous cyclic stirring and flow. The raw material flows back and forth between the return groove 22 and the mixing groove 21, making the melt fully mixed and plasticized, and at the same time preventing the unmelted particles from depositing at the bottom of the mixing groove 21. With the continuous operation of the extruder 4, the evenly molten PET raw material gradually flows towards the extrusion port, completing the extrusion process, ensuring that the preform raw material reaches an ideal molding state. The PET raw material is stirred multiple times during the extrusion process, preventing the raw material from stratifying due to temperature difference or density difference, ensuring the consistency of the molten PET raw material, and improving the preform molding quality.

[0025] As Figure 2 , Figure 12 , Figure 13 , Figure 14 , Figure 9As shown in the figure, a fixed block 32 is fixedly installed in the middle of the bottom of the second frame body 3. A first baffle 33 is arranged on the top of the fixed block 32 and is adapted to the bottom of the moving plate 19, which is used to prevent the blank body from falling backward behind the moving plate 19 before entering the discharging assembly. A rotating shaft 35 is rotatably installed at the bottom of the fixed block 32. A second baffle 34 is fixedly connected to one side of the bottom of the rotating shaft 35, and a torsion spring is arranged at the connection between the rotating shaft 35 and the fixed block 32. The second baffle 34 is used to block the rear of the discharging assembly. The discharging assembly includes a conveying hopper 36 fixedly installed inside the support plate 1. The conveying hopper 36 is arranged in an obtuse angle shape. A conveyor belt 37 is arranged at the bottom of the conveying hopper 36. A number of grooves 40 for increasing friction are formed on the conveyor belt 37. A conveyor belt motor 38 for driving the conveyor belt 37 is arranged on one side of the conveying hopper 36. A number of partition plates 39 are arranged on the outer surface of the conveyor belt 37. A first air inlet frame 41 is vertically arranged on one side of the conveying hopper 36. The top end of the first air inlet frame 41 is fixedly connected to the fixed block 32. A number of first air outlet pipes 42 are arranged on the first air inlet frame 41. A number of first spray nozzles 43 are arranged on the first air outlet pipes 42. The angles of the first spray nozzles 43 are inclined upward. A second air inlet frame 44 is also inclinedly arranged on one side of the conveying hopper 36. A number of second air outlet pipes 45 are arranged on the second air inlet frame 44. A number of second spray nozzles 46 are arranged on each of the number of second air outlet pipes 45. The number of second spray nozzles 46 is inclined toward the conveyor belt 37. The number of first air inlet frames 41 and the second air inlet frame 44 are connected to an external air source; After the blank is formed, the mold is opened, and the blank falls from the discharging mold 24 above the conveying hopper 36. The cooling air flow sprayed upward by the first spray nozzles 43 is aligned with the blank body, lifting and cooling the blank to prevent it from deforming due to high temperature and gravity. When the blank slowly falls into the conveyor belt 37, the second spray nozzles 46 spray air downward. Through the counteraction with the air flow of the first spray nozzles 43, the falling speed of the blank is further slowed down to ensure that the blank stably enters the gaps between the partition plates 39 on the conveyor belt 37. The conveyor belt motor of the conveyor belt 37 drives the conveyor belt 37 to move slowly forward, and the blanks are arranged in sequence to enter the next process. The first baffle 33 arranged on the top of the fixed block 32 is adapted to the bottom of the moving plate 19, effectively preventing the blank from falling backward after the mold is released, ensuring that the blank accurately enters the conveying hopper 36, avoiding blank damage or waste generation, improving production stability and product yield. The first spray nozzles 43 are aligned with the blank body for lifting and cooling, preventing the newly formed high-temperature blank from deforming due to gravity or rapid falling. The second spray nozzles 46 spray air toward the conveyor belt 37 to form a stable cooling air flow, enabling the blank to slowly and stably fall into the conveyor belt 37, effectively reducing the phenomenon of blank damage or deviation. Moreover, the partition plates 39 on the outer surface of the conveyor belt 37 ensure that the blanks are spaced apart during transportation, effectively preventing the blanks from colliding or stacking with each other during transportation, preventing the blanks from being scratched or deformed, ensuring that the finished blanks are neatly arranged, and providing convenience for the subsequent process.

[0026] The present application also discloses a production process for PET preforms, which is applied to the above-mentioned PET preform production equipment and includes the following steps: S1: After starting the equipment, the PET raw material enters the extruder 4, and the extruder 4 is uniformly heated through the air inlet module and the diversion module of the heating component, so that the PET raw material is gradually softened and melted; S2: The molten PET raw material flows from the extrusion port into the discharge die 24, and the servo motor 29 drives the forming die to slide along the slide rail 26 and gradually approaches the discharge die 24 to realize the molding of the preform; S3: After molding, the mold is opened, and the preform drops above the transfer hopper 36. The nozzles of the first air inlet frame 41 spray cooling air flow on the preform to prevent the preform from deforming at high temperature, and at the same time lift the preform and slowly guide it to fall; S4: The nozzles of the second air inlet frame 44 spray air on the conveyor belt 37 to form an air flow counterflush with the first nozzle 43, further slowing down the falling speed of the preform, so that the preform smoothly falls into the gap of the partition plate 39 on the conveyor belt 37; S5: The conveyor belt 37 motor drives the conveyor belt 37 to move slowly, and the preforms are arranged in an orderly manner at intervals of the partition plate 39, preventing stacking and collision, and ensuring the stable transportation of the preforms to the next process.

[0027] Compared with the prior art, this PET preform production process ensures the uniform heating and full plasticization of the PET raw material in the extruder 4 through the cooperation of the heating component and the mixing block 20, avoiding preform defects caused by temperature difference and unmelted particles, improving the molding quality. The mold closing and molding processes are precisely controlled by the servo motor 29, realizing the precise adjustment of the shape and thickness of the preform, improving the consistency and yield of the preform. The preform after demolding is cooled by two-way air flow spraying, effectively preventing the preform from deforming at high temperature. The lifting and counterflush air flow slow down the falling speed of the preform, avoiding damage to the preform caused by dropping. The conveyor belt 37 is provided with a partition plate 39 to keep the preforms at a distance during transportation, preventing mutual collision or stacking, ensuring that the preforms are neatly arranged and enter the next process, improving the automation level and production efficiency, reducing the scrap rate and manual intervention, and meeting the requirements of mass production.

[0028] Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0029] The present invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A PET preform production equipment, characterized in that: include: A support plate (1), wherein a first frame (2) and a second frame (3) are respectively arranged on both sides above the support plate (1), an extruder (4) is arranged above the first frame (2), a feed port (5) is arranged on one side of the extruder (4), a reduction motor (17) for driving the extruder (4) is arranged on one side of the extruder (4), a fixed plate (18) is fixedly mounted on one end of the second frame (3), a discharge die (24) is arranged on the end of the fixed plate (18) away from the extruder (4), one side of the discharge die (24) is connected to the extrusion port of the extruder (4), slide rails (26) are arranged on both sides of the bottom of the second frame (3), a sliding plate (27) is slidably mounted on each of the slide rails (26), a movable plate (19) is commonly arranged at one end of the two sliding plates (27), and a molding die (25) is arranged on a side of the movable plate (19) close to the fixed plate (18); A heating component, the heating component being arranged on the outer surface of the extruder (4), the heating component comprising an air inlet module and a flow guide module, the air inlet module being used to output hot air for transportation, and the flow guide module being used to drive and guide the hot air generated by the air inlet module; a driving assembly, the driving assembly being arranged above the second frame (3), the driving assembly being used to drive the molding die (25) to move closer to or further away from the discharge die (24) to perform molding; A discharge assembly, the discharge assembly is arranged inside the support plate (1) and below the second frame (3), the discharge assembly is used to receive the preform body produced by the discharge mold (24) and the molding mold (25) and transport it outwards.

2. The PET preform production equipment according to claim 1, characterized in that: The air inlet module comprises a plurality of heating chambers (6) sleeved on the outside of the extruder (4), and a plurality of hot air blowers (8) fixedly mounted on the top of the support plate (1); the flow guide module comprises an air inlet chamber (7) fixedly mounted below the heating chamber (6); and a plurality of air inlet pipes (9) are arranged between the plurality of hot air blowers (8) and the plurality of air inlet chambers (7) for communication.

3. The PET preform production equipment according to claim 2, characterized in that: A metal connector (10) is provided at one end of the air inlet pipe (9) close to the air inlet cavity (7); an air inlet (11) adapted to the metal connector (10) is provided at the bottom end of the air inlet cavity (7); and an air outlet (16) is also provided on one side of the top end of the air inlet cavity (7) and communicates with the interior of the heating cavity (6).

4. The PET preform production equipment according to claim 3, characterized in that: A vertical plate is fixedly mounted in the middle of the bottom end of the air inlet cavity (7), and a first guide plate (12) is also fixedly mounted on one side of the bottom end of the air inlet cavity (7). The air inlet (11) is located between the vertical plate and the first guide plate (12), and the top cross-section of the first guide plate (12) is arranged in an inverted "V" shape. A second guide plate (13) is fixedly mounted on one side of the top end of the air inlet cavity (7), and the second guide plate (13) is located directly above the air inlet (11). The second guide plate (13) is arranged in an obtuse angle.

5. The PET preform production equipment according to claim 4, characterized in that: A third guide plate (14) is also fixedly mounted on one side of the interior of the air inlet cavity (7); the third guide plate (14) is arranged in an inclined shape; one side of the third guide plate (14) cooperates with the second guide plate (13); the other side of the third guide plate (14) is located at the bottom of the air outlet (16); a plurality of guide plates (15) are also arranged on the upper surface of the third guide plate (14); the plurality of guide plates (15) are arranged in an inverted "V" shape, and the plurality of guide plates (15) are arranged in a nesting doll shape.

6. The PET preform production equipment according to claim 5, characterized in that: A plurality of mixing blocks (20) are arranged at the bottom of the extruder (4), a plurality of mixing grooves (21) are equidistantly arranged on the upper surface of the mixing block (20), a plurality of reflux grooves (22) are staggeredly arranged on both sides of the mixing groove (21) in an inclined shape, one end of the reflux groove (22) is connected to the mixing groove (21), and the other end of the reflux groove (22) is arranged in an inwardly concave semicircular shape to achieve a reflux effect, and a matching reflux column (23) is arranged inside the reflux groove (22), one end of the reflux column (23) is in an inclined shape and parallel to the mixing groove (21), and the other end of the reflux column (23) is arranged in an outwardly protruding semicircular shape.

7. The PET preform production equipment according to claim 1, characterized in that: The driving assembly comprises a connecting frame (28) fixedly mounted on one side of the second frame (3), servo motors (29) fixedly mounted on both upper and lower sides of the connecting frame (28), the output ends of the servo motors (29) fixedly connected to driving pulleys, screw rods (30) rotatably mounted on both sides of the second frame (3), one end of the screw rod (30) fixedly connected to a driven gear (31), belts are respectively provided between the two driving pulleys and the two driven gears (31), and the two screw rods (30) are respectively threadedly connected to both sides of the movable plate (19).

8. The PET preform production equipment according to claim 1, characterized in that: A fixed block (32) is fixedly installed at the middle of the bottom of the second frame (3); a first shielding plate (33) is arranged on the top of the fixed block (32) and is adapted to the bottom of the movable plate (19) to prevent the preform body from falling to the rear of the movable plate (19) before entering the discharge assembly; a rotating shaft (35) is rotatably installed at the bottom of the fixed block (32); a second shielding plate (34) is fixedly connected to one side of the bottom of the rotating shaft (35); a torsion spring is arranged at the connection between the rotating shaft (35) and the fixed block (32); and the second shielding plate (34) is used to shield the rear of the discharge assembly.

9. The PET preform production equipment according to claim 8, characterized in that: The discharging assembly comprises a conveying bucket (36) fixedly mounted inside the support plate (1), the conveying bucket (36) being arranged in an obtuse angle, a conveying belt (37) being arranged at the bottom of the conveying bucket (36), a plurality of grooves (40) for increasing friction being provided on the conveying belt (37), a conveying belt motor (38) for driving the conveying belt (37) being arranged on one side of the conveying bucket (36), a plurality of partition plates (39) being arranged on the outer surface of the conveying belt (37), a first air inlet frame (41) being arranged vertically on one side of the conveying bucket (36), a top end of the first air inlet frame (41) being fixedly connected to the fixing block (32), The first air inlet frame (41) is provided with a plurality of first air outlet pipes (42), the first air outlet pipes (42) are provided with a plurality of first nozzles (43), the first nozzles (43) are arranged at an angle of upward inclination, a second air inlet frame (44) is also arranged at an inclination on one side of the conveying bucket (36), the second air inlet frame (44) is provided with a plurality of second air outlet pipes (45), the plurality of second air outlet pipes (45) are each provided with a plurality of second nozzles (46), the plurality of second nozzles (46) are arranged at an inclination toward the conveyor belt (37), and the plurality of first air inlet frames (41) are connected to an external air source at the second air inlet frames (44).

10. A PET preform production process, applied to the PET preform production equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: After the equipment is started, the PET raw material enters the extruder (4), and the extruder (4) is evenly heated by the air inlet module and the flow guide module of the heating component, so that the PET raw material is gradually softened and melted; S2: The molten PET raw material flows from the extrusion port into the discharge mold (24), and the servo motor (29) drives the molding mold to slide along the slide rail (26), gradually approaching the discharge mold (24), thereby realizing molding of the bottle preform; S3: After molding, the mold opens and the preform falls from the discharge mold (24) to the top of the conveying bucket (36). The nozzle of the first air inlet rack (41) sprays cooling air to the preform to prevent the preform from being deformed by high temperature, and at the same time lifts the preform to slowly guide it to fall; S4: The nozzle of the second air inlet rack (44) sprays air toward the conveyor belt (37), forming an airflow counteracting that of the first nozzle (43), thereby further slowing down the falling speed of the preforms, so that the preforms fall smoothly into the gap between the partition plates (39) on the conveyor belt (37); S5: The conveyor belt (37) is driven by a motor to slowly move the conveyor belt (37), and the preforms are arranged in order under the partition plate (39) to prevent stacking and collision, thereby ensuring that the preforms are stably transported to the next process.

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