Plastic bottle injection molding production system and injection molding method

Abstract

The invention discloses a plastic bottle injection molding production system and an injection molding method, and belongs to the technical field of injection molding equipment.The plastic bottle injection molding production system comprises a machine body, a feeding mechanism, an injection mechanism, a fixed mold, a movable mold, a hydraulic mold closing mechanism, a female mold and a male mold, and after the male mold and the female mold are closed, a mold cavity is defined between the surfaces of the male mold and the female mold; an accommodating cavity is formed in one end of the male mold towards the fixed mold; the extrusion sliding plug is clamped in the containing cavity in a sliding mode, and the extrusion sliding plug and the injection hole are in a coaxial state; and the driving mechanism is mounted on the male die and is used for driving the extrusion sliding plug to move in the accommodating cavity. According to the injection mold, after injection is completed, the sliding plug is extruded to move reversely, materials in the containing cavity are extruded into the mold cavity, the materials in the mold cavity are mutually extruded and are in a tight state, in the extrusion process, air in the materials can be exhausted into the injection hole, and therefore the air in the mold cavity is exhausted, and the poor quality phenomenon after injection molding is reduced.

Description

Technical Field

[0001] This invention belongs to the field of injection molding equipment technology, specifically relating to a plastic bottle injection molding production system and injection molding method. Background Technology

[0002] Injection molding is a plastic processing method in which plastic is plasticized in a heated barrel of an injection molding machine and then injected into the cavity of a closed mold by a plunger or reciprocating screw to form a finished product. This method can process products with complex shapes, precise dimensions, or inserts, and has high production efficiency. Most thermoplastics and some thermosetting plastics (such as phenolic plastics) can be processed using this method. The material used for injection molding must have good flowability to fill the mold cavity and obtain the finished product.

[0003] For example, the energy-saving plastic preform injection molding device disclosed in Chinese Patent Publication No. CN206703406U uses an injection hydraulic cylinder to inject material into the mold cavity for injection molding. However, in existing plastic bottle injection molding equipment, the injection mechanism injects the material into the mold cavity and then performs molding. Because the material contains air during injection, the material in the mold cavity may not be tightly filled, meaning there may be air in the material. This results in poor quality of the molded plastic bottle product. Therefore, there is a need for an injection molding device that can expel air from the mold cavity. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a plastic bottle injection molding production system and injection molding method.

[0005] The technical solution adopted to solve the above-mentioned technical problems is: a plastic bottle injection molding production system, including the body of an injection molding machine, wherein the body is provided with a feeding mechanism, an injection mechanism, a fixed mold, a moving mold, and a hydraulic mold closing mechanism, wherein the fixed mold has an injection port communicating with the injection mechanism, and further includes: A female mold is installed on the outer wall of the fixed mold. The outer wall of the female mold has an injection hole that communicates with the injection port. A male mold is installed on the moving mold. After the male mold and the female mold are closed, the surfaces of the two molds form a mold cavity. A receiving cavity is opened at the end of the male mold facing the fixed mold. A squeeze plug is slidably engaged within the receiving cavity, and the squeeze plug is coaxial with the injection hole; A drive mechanism mounted on the male mold is used to drive the extrusion slide to move within the receiving cavity.

[0006] Through the above technical solution, during material injection, the drive mechanism drives the extrusion slide to move away from the fixed mold, making the cavity opening open, which is equivalent to increasing the volume of the mold cavity. After injection, the extrusion slide moves in the opposite direction and squeezes the material in the cavity into the mold cavity, so that the material in the mold cavity is squeezed together and becomes compact. During the extrusion process, air in the material can be discharged into the injection hole, thereby expelling the air in the mold cavity and reducing the quality defects after injection molding.

[0007] Furthermore, a connecting section is coaxially fixed to the end of the male mold away from the fixed mold, the connecting section is slidably inserted through the moving mold, and a stop nut is threaded onto the end of the male mold that extends out of the moving mold.

[0008] With the above technical solution, when assembling the male mold, the locking nut is screwed onto the connecting section, making it easier to install the male mold onto the moving mold.

[0009] Furthermore, the driving mechanism includes a cylinder horizontally mounted on the end face of the connecting section, the cylinder rod of the cylinder passing through the connecting section into the receiving cavity, the end of the extrusion slide being coaxially fixed to a connecting part, and one end of the cylinder rod passing through the receiving cavity being rotatably connected to the connecting part.

[0010] Through the above technical solution, the cylinder rod of the cylinder extends and retracts to drive the linear movement of the connecting part, thereby driving the extrusion slide to move within the receiving cavity of the male mold.

[0011] Furthermore, the extrusion slide plug has a sliding cavity on the side facing the female mold, a sliding part is slidably engaged in the sliding cavity, a stirring block is provided at the end of the sliding part, an air-avoiding groove is provided on the surface of the extrusion slide plug to allow the stirring block to pass freely, a rotating mechanism is provided on the male mold, and a retraction mechanism is provided inside the extrusion slide plug; The rotating mechanism is used to drive the extrusion slide to rotate around the axis of the male die during the linear motion of the extrusion slide; The retraction mechanism is used to drive the stirring block to retract into the clearance groove when the extrusion slide moves toward the fixed mold.

[0012] Through the above technical solution, the rotating mechanism drives the extrusion slide to rotate while moving linearly, thereby enabling the stirring block to stir the material in the cavity, so that the material near the injection hole is in a certain flow state, and thus the material in the mold cavity can flow smoothly back from the injection hole to the injection port, avoiding the material at the injection hole opening from solidifying and causing the injection hole to be blocked, resulting in excess material in the mold cavity not being able to flow back from the injection hole. In addition, when the extrusion slide moves toward the fixed mold, the retraction mechanism can drive the extrusion slide to move toward the retraction groove, so that after the extrusion slide moves into place toward the fixed mold, the end face of the stirring block can be flush with the end face of the extrusion slide, thus avoiding affecting the surface quality of the plastic bottle after injection molding.

[0013] Furthermore, the rotating mechanism includes a cylindrical portion fixed to the periphery of the connecting portion, with a first ball rotatably embedded at the end of the cylindrical portion, and a spiral rolling groove for engaging the first ball is provided on the inner wall of the receiving cavity.

[0014] With the above technical solution, when the extrusion slide moves toward the fixed mold, the first ball will roll in the spiral rolling groove, thereby enabling the extrusion slide to rotate in the receiving cavity. At the same time, the extrusion slide can move linearly along the axial direction of the male mold, and the structure is simple.

[0015] Furthermore, the retraction mechanism includes a drive rod coaxially fixed to the end of the cylinder rod of the cylinder, the drive rod passing through the connecting part and threadedly connected to the sliding part.

[0016] With the above technical solution, when the extrusion slide moves toward the fixed mold, the extrusion slide is in a rotating state, which causes the sliding part to rotate synchronously. When the sliding part rotates, the drive rod will screw into the sliding part thread. Through the screw engagement, the sliding part moves away from the fixed mold, which causes the stirring block to gradually move toward the inside of the recessed groove until the end face of the extrusion slide is flush with the end face of the male mold, and the surface of the stirring block is flush with the end faces of the male mold and the extrusion slide.

[0017] Furthermore, the outer wall of the agitator is fixed with an ear block, the sliding part has a cavity for the ear block to pass through freely, and the periphery of the sliding part has a sliding hole for the ear block to pass through freely. The sliding part is provided with a floating mechanism, which is used to alternately drive multiple agitator blocks to move along the axial direction of the sliding part when the sliding part moves in the direction of retracting into the sliding cavity.

[0018] With the above technical solution, when injecting material into the mold cavity, the floating mechanism alternately drives multiple agitator blocks to move axially along the sliding part, so that the agitator blocks can alternately squeeze the material in the cavity on the circumferential surface, so that the material in the cavity is subjected to shearing forces in multiple directions, thereby making it difficult for air to remain inside the material in the cavity.

[0019] Furthermore, a plurality of guide pins are fixedly inserted at the end of the sliding part, and a guide hole is opened on the outer wall of the ear block to allow the guide pins to pass freely. A spring is wrapped around the periphery of the guide pin, and the two ends of the spring in the direction of elastic force elastically abut against the ear block and the inner wall of the cavity, respectively.

[0020] Through the above technical solution, the spring generates an elastic resisting force on the ear block, so that the stirring block can automatically reset after being driven to move by the floating mechanism.

[0021] Furthermore, the floating mechanism includes a fixed pin coaxially fixed to the end of the drive rod, a rotating paddle fixed to the end of the fixed pin, and a hollow mounting part fixed to the side of the ear block facing the connecting part. A second ball is rotatably fitted to the end of the mounting part, and the second ball cooperates with the rotating paddle.

[0022] With the above technical solution, when the squeeze plug rotates, the drive rod and the sliding part are screwed together, so that the second ball will gradually approach the rotating block. As the squeeze plug rotates, multiple second balls alternately contact the rotating block, and the second balls are squeezed by the rotating block, thereby enabling multiple agitating blocks to move alternately towards the outside of the sliding part.

[0023] A method for injection molding plastic bottles, applied to the plastic bottle injection molding production system described above, includes: The hydraulic mold closing mechanism is activated and drives the moving mold to move towards the fixed mold, so that the male mold moves into the female mold and forms a mold cavity between the surfaces of the female mold and the male mold. The drive mechanism drives the extrusion slide to move away from the fixed mold, which opens the opening of the receiving cavity and increases the internal volume of the mold cavity. The feeding mechanism feeds the material into the injection mechanism, which heats and melts the material and then transports the heated and melted material to the injection port. The material then enters the injection hole through the injection port and then enters the mold cavity through the injection hole, with some material entering the receiving cavity. After injection, the drive mechanism is restarted and drives the extrusion slide to move towards the fixed mold until the end face of the extrusion slide is flush with the end face of the male mold. During the extrusion process, the extrusion slide squeezes the material in the receiving cavity into the mold cavity, so that the material in the mold cavity squeezes each other, making the material more compact, and at the same time squeezing the air in the material into the injection hole.

[0024] Through the above technical solution, the driving mechanism drives the extrusion slide to move away from the fixed mold, so that the cavity opening is opened, which is equivalent to increasing the volume of the mold cavity. After injection, the extrusion slide moves in the opposite direction and squeezes the material in the cavity into the mold cavity, so that the material in the mold cavity is squeezed together and becomes compact. During the extrusion process, air in the material can be discharged into the injection hole, thereby expelling the air in the mold cavity and reducing the quality defects after injection molding.

[0025] The beneficial effects of this invention are as follows: 1. In this invention, during material injection, the extrusion slide is driven by the drive mechanism to move away from the fixed mold, thereby opening the cavity opening and increasing the volume of the mold cavity. After injection, the extrusion slide moves in the opposite direction and extrudes the material in the cavity into the mold cavity, causing the material in the mold cavity to be squeezed together and compacted. During the extrusion process, air in the material can be discharged into the injection hole, thereby expelling the air in the mold cavity and reducing the quality defects after injection molding. 2. In this invention, the rotating mechanism drives the extrusion slide to rotate while moving linearly, thereby enabling the stirring block to agitate the material in the cavity, so that the material near the injection hole is in a certain flow state, thereby allowing the material in the mold cavity to flow smoothly back from the injection hole to the injection port, avoiding the material at the injection hole opening from solidifying and causing the injection hole to be blocked, resulting in excess material in the mold cavity being unable to flow back from the injection hole; 3. In this invention, when injecting material into the mold cavity, the floating mechanism alternately drives multiple agitator blocks to move axially along the sliding part, so that the agitator blocks can alternately squeeze the material in the cavity on the circumferential surface, so that the material in the cavity is subjected to shearing forces in multiple directions, thereby making it difficult for air to remain inside the material in the cavity. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a plastic bottle injection molding production system according to an embodiment of the present invention; Figure 2 yes Figure 1 A diagram illustrating the positional relationship from another perspective; Figure 3 This is a schematic diagram showing the positional relationship of the fixed mold, male mold, and female mold after assembly in this invention; Figure 4 yes Figure 3 A diagram illustrating the positional relationship from another perspective; Figure 5 This is a schematic diagram showing the positional relationship of the female mold, cylinder, and stop nut after assembly in this invention; Figure 6 yes Figure 5 A diagram illustrating the positional relationship from another perspective; Figure 7 yes Figure 6 Schematic diagram of the explosive decomposition of the medium structure; Figure 8 yes Figure 7 A diagram illustrating the positional relationship from another perspective; Figure 9 yes Figure 8 Enlarged schematic diagram of the local structure at point A; Figure 10 yes Figure 5A schematic diagram showing the positional relationship of the middle section after it has been cut open; Figure 11 This is a schematic diagram showing the positional relationship of the male mold, extrusion plug, and sliding part after assembly in this invention; Figure 12 This is a schematic diagram showing the positional relationship between the sliding part and the stirring block after assembly in this invention; Figure 13 yes Figure 12 A schematic diagram showing the positional relationship of the middle section after it has been cut open.

[0027] Reference numerals: 1. Body; 2. Injection mechanism; 3. Feeding mechanism; 4. Fixed mold; 5. Female mold; 6. Moving mold; 7. Hydraulic mold closing mechanism; 8. Cylinder; 9. Stop nut; 10. Connecting section; 11. Male mold; 12. Injection port; 13. Injection hole; 14. Drive rod; 15. Connecting part; 16. Extrusion slide; 17. Sliding part; 18. Fixing pin; 19. Stirring block; 20. Receiving cavity; 21. Cylindrical part; 22. Rotating block; 23. Spring; 24. Guide pin; 25. Ear block; 26. Mounting part; 27. Sliding hole; 28. Clearance groove; 29. ​​Sliding cavity; 30. First ball bearing; 31. Spiral rolling groove; 32. Mold cavity; 33. Hole; 34. Second ball bearing. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] like Figures 1-13 As shown, this embodiment provides a plastic bottle injection molding production system, including the body 1 of an injection molding machine. The body 1 is equipped with a feeding mechanism 3, an injection mechanism 2, a fixed mold 4, a moving mold 6, and a hydraulic clamping mechanism 7. The fixed mold 4 has an injection port 12 communicating with the injection mechanism 2. The injection mechanism 2 has a heating and melting device. The feeding mechanism 3 conveys the material to the injection mechanism 2, and then the heating and melting device heats and melts the material, making the material flow in a certain way. A female mold 5 is installed on the outer wall of the fixed mold 4 facing the moving mold 6. The outer wall of the female mold 5 has an injection port 12 communicating with the injection port 12. A connecting section 10 is slidably installed on the moving mold 6 through the injection hole 13. A male mold 11 is coaxially installed on one end of the connecting section 10 facing the fixed mold 4. A stop nut 9 is threadedly fitted on the other end of the connecting section 10. The stop nut 9 is screwed into the connecting section 10 until the end face of the stop nut 9 presses against the surface of the moving mold 6. The hydraulic mold closing mechanism 7 drives the moving mold 6 to move towards the fixed mold 4, so that the male mold 11 and the female mold 5 close together. After the mold is closed, the outer surface of the male mold 11 and the inner cavity surface of the female mold 5 form a mold cavity 32. The contour of the mold cavity 32 matches the contour of the plastic bottle. A cavity 20 is provided at the end of the male mold 11 facing the fixed mold 4. A compression plug 16 is coaxially and slidably engaged within the cavity 20. The compression plug 16 is coaxial with the injection hole 13. A cylinder 8 is horizontally mounted on the end face of the connecting section 10 away from the fixed mold 4. The cylinder rod of the cylinder 8 passes through the connecting section 10 into the cavity 20. A connecting part 15 is coaxially fixed to the end of the compression plug 16. A drive rod 14 is coaxially fixed to the end of the cylinder rod of the cylinder 8 that passes through the cavity 20. A bearing is mounted on the end face of the connecting part 15, and the drive rod 14 is fixedly inserted into the inner ring of the bearing, thereby causing the cylinder rod of the cylinder 8 to be rotatably connected to the connecting part 15. The periphery of the connecting part 15... Two cylindrical portions 21 are vertically fixed and symmetrically arranged along the axial direction of the connecting portion 15. The ends of the cylindrical portions 21 are rotatably fitted with first ball bearings 30. The inner wall of the receiving cavity 20 is provided with a spiral rolling groove 31 for the first ball bearings 30 to engage. When the cylinder rod of the cylinder 8 extends, it will drive the connecting portion 15 and the extrusion slide 16 to move towards the fixed mold 4, and cause the first ball bearings 30 to roll in the spiral rolling groove 31. Since the drive rod 14 is rotatably connected to the connecting portion 15, the connecting portion 15 will rotate, so that when the extrusion slide 16 moves towards the fixed mold 4, the extrusion slide 16 will also rotate around the axial direction of the male mold 11. The extrusion plug 16 has a sliding cavity 29 on the side facing the female mold 5. A sliding part 17 is slidably engaged in the sliding cavity 29. The end of the drive rod 14 away from the cylinder 8 passes through the connecting part 15 and is threadedly connected to the sliding part 17. The end of the sliding part 17 is provided with a stirring block 19. The surface of the extrusion plug 16 has a clearance groove 28 for the stirring block 19 to pass freely. An ear block 25 is fixedly connected to the outer wall of the stirring block 19. The sliding part 17 has a cavity 33 for the ear block 25 to pass freely, and the periphery of the sliding part 17 has a sliding hole 27 for the ear block 25 to pass freely. Multiple guide pins 24 are fixedly inserted at the end of the sliding part 17. The outer wall of the ear block 25 has a guide pin for the ear block 25 to pass freely. A guide hole 24 allows free passage. A spring 23 is wrapped around the periphery of the guide pin 24. The two ends of the spring 23 elastically abut against the inner wall of the lug 25 and the cavity 33, respectively. A fixing pin 18 is coaxially fixed to the end of the drive rod 14. A rotating lever 22 is fixed to the end of the fixing pin 18. A hollow mounting part 26 is fixed to the side of the lug 25 facing the connecting part 15. The end of the mounting part 26 connected to the lug 25 is open, allowing the guide pin 24 to pass into the inner cavity of the mounting part 26. The end of the mounting part 26 away from the lug 25 is closed and has a spherical groove. A second ball 34 is rotatably embedded in the spherical groove. The second ball 34 works in conjunction with the rotating lever 22.

[0030] The working principle of this embodiment is as follows: The hydraulic mold closing mechanism 7 drives the moving mold 6 to move toward the fixed mold 4, so that the fixed mold 4 and the moving mold 6 close together. After the mold is closed, the outer surface of the male mold 11 and the inner cavity surface of the female mold 5 form a mold cavity 32. The contour of the mold cavity 32 matches the contour of the plastic bottle. The cylinder rod of the cylinder 8 is shortened (i.e., the cylinder rod of the cylinder 8 retracts into the cylinder 8), so that the extrusion slide 16 moves away from the fixed mold 4, thereby making the receiving cavity 20 open toward the side opening of the fixed mold 4. This is equivalent to increasing the internal volume of the mold cavity 32. The feeding mechanism 3 conveys the material to the injection mechanism 2. The heating and melting device in the injection mechanism 2 heats and melts the material, making it flowable. The injection mechanism 2 then injects the heated and melted material into the injection port 12 of the fixed mold 4. The material then enters the injection hole 13 through the injection port 12 and then enters the mold cavity 32 through the injection hole 13. Some of the material enters the receiving cavity 20. At this time, the total amount of material in the mold cavity 32 and the receiving cavity 20 is greater than the total amount of material in the mold cavity 32 in the prior art. At this time, the sliding part 17 protrudes to the outside of the end face of the extrusion slide 16. After injection, the cylinder rod of cylinder 8 extends, thereby driving the extrusion slide 16 to move towards the fixed mold 4. The extrusion slide 16 also rotates, causing the sliding part 17 to rotate synchronously. When the sliding part 17 rotates, the sliding part 17 and the drive rod 14 are screwed together. When screwed together, the sliding part 17 will move away from the fixed mold 4. At this time, as the sliding part 17 rotates, the stirring block 19 can stir the material in the receiving cavity 20, so that the material near the opening of the injection hole 13 (facing the moving mold 6) is in a stirred state, preventing the material near the opening of the injection hole 13 from solidifying and blocking the opening of the injection hole 13. Furthermore, when the sliding part 17 moves away from the fixed mold 4, since the drive rod 14 is in a fixed position, the ear block 25 will continuously approach the rotating dial block 22, causing the second ball 34 to alternately contact the rotating dial block 22. When in contact, the rotating dial block 22 exerts a squeezing force on the second ball 34, causing the second ball 34 to drive the mounting part 26 and the ear block 25 to move towards the fixed mold 4. This causes the stirring dial block 19 to alternately move towards the fixed mold 4 in the circumferential direction. After the second ball 34 disengages from the rotating dial block 22, the spring 23 provides elasticity to the ear block 25. The resisting force causes the ear block 25 and the agitator block 19 to move rapidly away from the fixed mold 4. This allows the agitator block 19 to generate multi-directional shearing forces on the material in the receiving cavity 20, breaking up air bubbles inside the material and allowing air to escape. After the extrusion slide 16 moves into position, the end face of the extrusion slide 16 is flush with the end face of the male mold 11. At the same time, the surface of the agitator block 19 is also flush with the end face of the extrusion slide 16. The rotating block 22 rotates between two adjacent second balls 34 without contacting the second balls 34 or the mounting part 26. Then, the injection molding equipment processes the material in the mold cavity 32 using existing technology.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A plastic bottle injection molding production system, comprising the body (1) of an injection molding machine, wherein the body (1) is provided with a feeding mechanism (3), an injection mechanism (2), a fixed mold (4), a moving mold (6), and a hydraulic mold closing mechanism (7), wherein the fixed mold (4) is provided with an injection port (12) communicating with the injection mechanism (2), characterized in that, Also includes: A female mold (5) is installed on the outer wall of the fixed mold (4). An injection hole (13) communicating with the injection port (12) is opened on the outer wall of the female mold (5). A male mold (11) is installed on the moving mold (6). After the male mold (11) and the female mold (5) are closed, the surfaces of the two form a mold cavity (32). A receiving cavity (20) is opened at one end of the male mold (11) facing the fixed mold (4). A squeeze plug (16) is slidably engaged in the receiving cavity (20), and the squeeze plug (16) is coaxial with the injection hole (13); A drive mechanism is mounted on the male mold (11) for driving the extrusion slide (16) to move within the receiving cavity (20).

2. The plastic bottle injection molding production system according to claim 1, characterized in that, The male mold (11) is coaxially fixed to one end away from the fixed mold (4) with a connecting section (10), the connecting section (10) is slidably inserted through the moving mold (6), and a stop nut (9) is threaded onto one end of the moving mold (6).

3. The plastic bottle injection molding production system according to claim 2, characterized in that, The driving mechanism includes a cylinder (8) horizontally mounted on the end face of the connecting section (10). The cylinder rod of the cylinder (8) passes through the connecting section (10) into the receiving cavity (20). The end of the extrusion slide (16) is coaxially fixed to a connecting part (15). One end of the cylinder rod of the cylinder (8) that passes through the receiving cavity (20) is rotatably connected to the connecting part (15).

4. The plastic bottle injection molding production system according to claim 3, characterized in that, The extrusion slide (16) has a sliding cavity (29) on the side facing the female mold (5). A sliding part (17) is slidably engaged in the sliding cavity (29). A stirring block (19) is provided at the end of the sliding part (17). An anti-airway groove (28) is provided on the surface of the extrusion slide (16) to allow the stirring block (19) to pass freely. A rotating mechanism is provided on the male mold (11). A retraction mechanism is provided inside the extrusion slide (16). The rotating mechanism is used to drive the extrusion slide (16) to rotate around the axis of the male mold (11) when the extrusion slide (16) moves linearly; The retraction mechanism is used to drive the stirring block (19) to retract into the clearance groove (28) when the extrusion slide (16) moves toward the fixed mold (4).

5. The injection molding production system for plastic bottles according to claim 4, characterized in that, The rotating mechanism includes a cylindrical part (21) fixed to the periphery of the connecting part (15), and a first ball (30) is rotatably embedded at the end of the cylindrical part (21). The inner wall of the receiving cavity (20) is provided with a spiral rolling groove (31) for engaging the first ball (30).

6. The plastic bottle injection molding production system according to claim 4, characterized in that, The retraction mechanism includes a drive rod (14) coaxially fixed to the end of the cylinder rod of the cylinder (8), the drive rod (14) passing through the connecting part (15) and threadedly connected to the sliding part (17).

7. The injection molding production system for plastic bottles according to claim 6, characterized in that, The outer wall of the stirring block (19) is fixed with an ear block (25). The sliding part (17) has a cavity (33) for the ear block (25) to pass through freely. The periphery of the sliding part (17) has a sliding hole (27) for the ear block (25) to pass through freely. The sliding part (17) is provided with a floating mechanism. The floating mechanism is used to alternately drive multiple stirring blocks (19) to move along the axial direction of the sliding part (17) when the sliding part (17) moves in the direction of retracting into the sliding cavity (29).

8. The injection molding production system for plastic bottles according to claim 7, characterized in that, Multiple guide pins (24) are fixedly inserted at the end of the sliding part (17). The outer wall of the ear block (25) is provided with a guide hole for the guide pins (24) to pass freely. A spring (23) is wrapped around the periphery of the guide pin (24). The two ends of the spring (23) elastically abut against the ear block (25) and the inner wall of the cavity (33) respectively.

9. A plastic bottle injection molding production system according to claim 7, characterized in that, The floating mechanism includes a fixed pin (18) coaxially fixed to the end of the drive rod (14), a rotating paddle (22) fixed to the end of the fixed pin (18), and a hollow mounting part (26) fixed to the side of the ear block (25) facing the connecting part (15). A second ball (34) is rotatably fitted to the end of the mounting part (26), and the second ball (34) cooperates with the rotating paddle (22).

10. A method for injection molding plastic bottles, applied to the plastic bottle injection molding production system according to any one of claims 1 to 9, characterized in that, include: The hydraulic mold closing mechanism (7) is started and drives the moving mold (6) to move toward the fixed mold (4), so that the male mold (11) moves into the female mold (5) and forms a mold cavity (32) between the surfaces of the female mold (5) and the male mold (11). The drive mechanism drives the extrusion slide (16) to move away from the fixed mold (4), which opens the opening of the receiving cavity (20) and increases the internal volume of the mold cavity (32); The feeding mechanism (3) feeds the material into the injection mechanism (2), the injection mechanism (2) heats and melts the material, and then transports the heated and melted material to the injection port (12), and then into the injection hole (13) through the injection port (12), and then into the mold cavity (32) through the injection hole (13), and some of the material enters the receiving cavity (20); After injection, the drive mechanism is restarted and the extrusion slide (16) is driven to move toward the fixed mold (4) until the end face of the extrusion slide (16) is flush with the end face of the male mold (11). During the extrusion process, the extrusion slide (16) extrudes the material in the receiving cavity (20) into the mold cavity (32), so that the material in the mold cavity (32) is squeezed against each other, making the material more compact, and at the same time, the air in the material is squeezed to the injection hole (13).

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