Double-wall vacuum plastic bottle

Abstract

A double-wall vacuum plastic bottle. First, an outer preform (5) and an inner preform (6) are injection molded; second, the outer preform (5) is blow-molded into an outer shell (1); then, a second mold core (8) and the inner preform (6) are inserted into the outer shell (1), a bottle mouth of the inner preform (6) is tightly joined to a bottle mouth of the outer shell (1), forming a sealed hollow interlayer (4); the inner preform (6) is blow-molded inside the outer shell (1) to form an inner shell (2); next, air in the hollow interlayer (4) between the outer shell (1) and inner shell (2) is extracted to create a vacuum; and finally, a sealing ring (3) is injection molded to seal and fix the outer shell (1) and inner shell (2), forming an integrated double-wall vacuum plastic bottle. The double-wall vacuum plastic bottle offers advantages such as effective heat insulation and freshness preservation, impact resistance, convenient processing, and low costs.

Description

A double-vacuum plastic bottle Technical Field

[0001] This invention belongs to the field of plastic bottle technology, and specifically relates to a double-vacuum plastic bottle. Background Technology

[0002] Plastic bottles possess many advantages of plastic products, including being unbreakable, inexpensive, highly transparent, and made from food-grade materials. They are a common type of container widely used for carbonated beverages, drinking water, fruit juice, enzyme and tea drinks, medical liquid containers, beverage containers, condiment containers, and more, with a very large demand.

[0003] Although some existing plastic bottles are double-walled and hollow, the interlayer is not vacuum-sealed, resulting in poor heat preservation and food preservation effects. Therefore, it is necessary to research and improve plastic bottles to develop a double-walled vacuum plastic bottle that offers good heat preservation and food preservation, is impact-resistant, easy to process, and inexpensive. Solving technical problems

[0004] To address the shortcomings of existing technologies, this invention provides a double-walled vacuum plastic bottle. First, an outer preform and an inner preform are injection molded. Second, the outer preform is blow-molded into a shell. Then, a second mold core and the inner preform are inserted into the shell, with the bottle neck of the inner preform tightly joined to the bottle neck of the outer shell, forming a sealed hollow interlayer. The inner preform is then blow-molded within the shell to form an inner shell. Next, the air in the hollow interlayer between the outer and inner shells is evacuated to create a vacuum. Finally, a sealing ring is injection molded to seal and fix the outer and inner shells, forming an integrated double-walled vacuum plastic bottle. This double-walled vacuum plastic bottle has advantages such as good heat preservation and freshness retention, impact resistance, easy processing, and low price. Technical solutions

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a dual-channel grain conveyor with blower, characterized in that: firstly, an outer preform and an inner preform are injection molded; secondly, the outer preform is blow molded into an outer shell; then, a second mold core and an inner preform are inserted into the outer shell, with the bottle mouth of the inner preform tightly joined to the bottle mouth of the outer shell to form a sealed hollow interlayer; the inner preform is blow molded into an inner shell within the outer shell; next, the air in the hollow interlayer between the outer shell and the inner shell is evacuated to form a vacuum; finally, a sealing ring is injection molded to seal and fix the outer shell and the inner shell, forming an integrated double-layer vacuum plastic bottle.

[0006] Preferably, the mold cavity for the outer blank is composed of a first fixed mold, a first moving mold, a first slider, a second slider, and a first mold core, and the outer blank and inner blank are injection molded in the mold cavity.

[0007] Preferably, the first insert is assembled inside the first mold core to form a sealed first oil channel, through which oil flows, and the outer blank is wrapped around the first mold core. The temperature of the first mold core is controlled by the oil temperature, thereby adjusting the temperature of the outer blank.

[0008] The second insert is assembled inside the second mold core to form a sealed second oil channel. The oil flows through the circuit, and the inner blank is wrapped around the second mold core. The temperature of the second mold core is controlled by the oil temperature, thereby regulating the temperature of the inner blank.

[0009] Preferably, the first mold cavity, the second mold cavity, and the third mold cavity constitute the outer shell blow molding cavity;

[0010] The first motor drives the first mold cavity to move forward, the second motor drives the second mold cavity to move forward, and the third motor drives the third mold cavity to move upward. The first mold core, the outer blank, the first slider, and the second slider move downward, closing the outer shell blow molding cavity.

[0011] The sixth motor drives the fourth top block to move forward, the fourth top block pushes the first top block in front, the first top block drives the first fixed block and the first insert to move downward, the cone at the front end of the first insert leaves the cone hole at the front end of the first mold core, the groove on the first insert connects with the cone-shaped gap to form the first air channel;

[0012] Air is blown in through the first air channel to blow-mold the outer preform into a shell. After cooling and solidification, the first motor drives the first mold cavity to retract, the second motor drives the second mold cavity to retract, and the third motor drives the third mold cavity to descend, opening the shell blow molding cavity.

[0013] Preferably, the fourth motor drives the first robotic arm to translate, and the first robotic arm grasps the first slider and the second slider;

[0014] The first mold core and the second mold core are installed on the second worktable. The tenth motor drives the second worktable, the first mold core and the second mold core to move upward, so that the first mold core is pulled out of the shell.

[0015] The fourth motor drives the first robotic arm, the outer shell, the first slider, and the second slider to translate onto the first receiving platform. The first robotic arm returns, while the outer shell, the first slider, and the second slider remain on the first receiving platform.

[0016] The tenth motor drives the second mold core to move downward, so that the second mold core and the inner preform are inserted into the outer shell, and the bottle mouth of the inner preform is tightly joined with the bottle mouth of the outer shell.

[0017] The fifth motor drives the third top block forward, which in turn pushes against the second top block. The second top block drives the second fixed block and the second insert to move downward. The cone at the front end of the second insert leaves the cone hole at the front end of the second mold core. The groove on the second insert connects with the conical gap to form the second air channel. Air is blown in through the second air channel to inflate the inner blank. Air is blown into the interlayer through the third air channel. By adjusting the interlayer gap between the outer shell and the inner shell through the air pressure difference, the inner blank is blown into the inner shell and cooled to solidify.

[0018] Preferably, the air in the interlayer is evacuated through the third air channel, so that a vacuum is formed in the hollow interlayer between the outer shell and the inner shell;

[0019] The seventh motor drives the slide table forward, the right robotic arm grabs the first slider, and the left robotic arm grabs the second slider;

[0020] The eighth motor drives the right and left robotic arms to move outward synchronously, causing the first and second sliders to move outward synchronously, thus disengaging the first and second sliders from the bottle opening of the outer shell.

[0021] The ninth motor drives the fifth top block forward, and the fifth top block rotates the plug, causing the plug to quickly block the opening after the first slider is pulled out; and block the opening of the third air channel on the bottle mouth of the outer shell;

[0022] The tenth motor drives the second mold core to move upward, and the seventh and eighth motors drive the first and second sliders to move to the second receiving platform. The first and second sliders remain on the second receiving platform, and the seventh motor drives the right and left robotic arms to return.

[0023] Preferably, the mold cavity of the sealing ring is composed of the second fixed mold, the second moving mold, the outer shell and the inner shell. The sealing ring is injection molded in the mold cavity to seal and fix the outer shell and the inner shell, forming an integrated double-layer vacuum plastic bottle.

[0024] The tenth motor drives the second mold core to move upward, and the second mold core detaches from the inner shell;

[0025] When the injection molding machine opens the mold, the second fixed mold and the second moving mold are opened, and the double-vacuum plastic bottle falls onto the conveyor belt, which then outputs the plastic bottle.

[0026] Preferably, the tenth motor drives the first, second, third, and fourth worktables to rise;

[0027] The eleventh motor drives the first, second, third, and fourth worktables to rotate 90 degrees, so that the first worktable rotates to the position of the second worktable, the second worktable rotates to the position of the third worktable, the third worktable rotates to the position of the fourth worktable, and the fourth worktable rotates to the position of the first worktable.

[0028] The tenth motor drives the first, second, third, and fourth worktables to descend;

[0029] The preform is injected under the first workbench, blow-molded under the second workbench, vacuum is drawn under the third workbench, and the sealing ring is injected under the fourth workbench. The workbench rises, rotates 90 degrees, and falls, in a cycle, continuously producing double-vacuum plastic bottles. Beneficial effects

[0030] This invention provides a double-vacuum plastic bottle, which has the following beneficial effects:

[0031] A double-walled vacuum plastic bottle is produced by first injection molding an outer preform and an inner preform. Next, the outer preform is blow-molded into an outer shell. Then, a second mold core and the inner preform are inserted into the outer shell, with the bottle mouth of the inner preform tightly joined to the bottle mouth of the outer shell, forming a sealed hollow interlayer. The inner preform is then blow-molded inside the outer shell to form an inner shell. Next, the air in the hollow interlayer between the outer and inner shells is evacuated to create a vacuum. Finally, a sealing ring is injection molded to seal and fix the outer and inner shells, forming an integrated double-walled vacuum plastic bottle. This double-walled vacuum plastic bottle has advantages such as good heat preservation and freshness retention, impact resistance, easy processing, and low price. Attached Figure Description

[0032] Figure 1 is a cross-sectional view of the plastic bottle of the present invention;

[0033] Figure 2 is a partial schematic diagram of the present invention;

[0034] Figures 3-4 are partial cross-sectional views of the present invention;

[0035] Figure 5 is a partial schematic diagram of the present invention;

[0036] Figure 6 is a partial cross-sectional view of the present invention;

[0037] Figure 7-12 is a partial structural schematic diagram of the present invention;

[0038] Figure 13 is a partial cross-sectional view of the present invention;

[0039] Figures 14-15 are schematic diagrams of the overall structure of the present invention;

[0040] In the attached diagram: 1. Outer shell; 2. Inner shell; 3. Sealing ring; 4. Interlayer; 5. Outer blank; 6. Inner blank; 7. First mold core; 8. Second mold core; 9. First fixed mold; 10. First moving mold; 11. Second insert; 12. Second insert pin; 13. Second ejector block; 14. Second fixing block; 15. Second spring; 16. Second oil channel; 17. Second air channel; 18. First insert; 19. First insert pin; 20. First ejector block; 21. First fixing block; 22. First spring; 23. First oil channel; 24. First air channel; 25. First slider; 26. Second slider; 27. Third air channel; 28. First motor; 29. ​​First mold cavity; 30. 31. Second mold cavity; 32. Third motor; 33. Third mold cavity; 34. Fourth motor; 35. First robot arm; 36. Fifth motor; 37. Third ejector block; 38. Sixth motor; 39. Fourth ejector block; 40. First receiving platform; 41. Second receiving platform; 42. Seventh motor; 43. Slide table; 44. Eighth motor; 45. Right robot arm; 46. Left robot arm; 47. Ninth motor; 48. Fifth ejector block; 49. Plug; 50. Second fixed mold; 51. Second moving mold; 52. Tenth motor; 53. Eleventh motor; 54. First worktable; 55. Second worktable; 56. Third worktable; 57. Fourth worktable; 58. Conveyor belt. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0042] As shown in Figures 1-15, the present invention provides a technical solution: First, an outer preform 5 and an inner preform 6 are injection molded. Second, the outer preform 5 is blow molded into an outer shell 1. Then, a second mold core 8 and the inner preform 6 are inserted into the outer shell 1, and the bottle mouth of the inner preform 6 is tightly joined with the bottle mouth of the outer shell 1 to form a sealed hollow interlayer 4. The inner preform 6 is blow molded into an inner shell 2 inside the outer shell 1. Next, the air in the hollow interlayer 4 between the outer shell 1 and the inner shell 2 is evacuated to form a vacuum. Finally, a sealing ring 3 is injection molded to seal and fix the outer shell 1 and the inner shell 2, forming an integrated double-layer vacuum plastic bottle.

[0043] The first fixed mold 9, the first moving mold 10, the first slider 25, the second slider 26 and the first mold core 7 form the mold cavity of the outer blank 5. The first fixed mold 9, the first moving mold 10 and the second mold core 8 form the mold cavity of the outer blank 5. The outer blank 5 and the inner blank 6 are injection molded in the mold cavity.

[0044] The first insert 18 is assembled inside the first mold core 7 to form a sealed first oil channel 24. The oil circuit flows, and the outer blank 5 is wrapped around the first mold core 7. The temperature of the first mold core 7 is controlled by the oil temperature, and the temperature of the outer blank 5 is adjusted.

[0045] The second insert 12 is assembled inside the second mold core 8 to form a sealed second oil channel 16. The oil circuit flows, and the inner blank 6 is wrapped around the second mold core 8. The temperature of the second mold core 8 is controlled by the oil temperature, and the temperature of the inner blank 6 is adjusted.

[0046] The first mold cavity 29, the second mold cavity 31 and the third mold cavity 33 constitute the blow molding cavity of the outer shell 1;

[0047] The first motor 28 drives the first mold cavity 29 to move forward, the second motor 30 drives the second mold cavity 31 to move forward, the third motor 32 drives the third mold cavity 33 to move upward, the first mold core 7, the outer blank 5, the first slider 25 and the second slider 26 move downward, closing the blow molding cavity of the outer shell 1;

[0048] The sixth motor 38 drives the fourth top block 39 to move forward. The fourth top block 39 pushes the first top block 20. The first top block 20 drives the first fixed block 21 and the first insert pin 19 to move downward. The cone at the front end of the first insert pin 19 leaves the cone hole at the front end of the first mold core 7 to form a gap. The groove on the first insert pin 19 is connected to the cone gap to form the first air channel 24.

[0049] Air is blown in through the first air channel 24 to blow-mold the outer blank 5 into the outer shell 1. After cooling and shaping, the first motor 28 drives the first mold cavity 29 to move backward, the second motor 30 drives the second mold cavity 31 to move backward, and the third motor 32 drives the third mold cavity 33 to move downward, opening the blow molding cavity of the outer shell 1.

[0050] The fourth motor 34 drives the first robotic arm 35 to translate, and the first robotic arm 35 grasps the first slider 25 and the second slider 26;

[0051] The first mold core 7 and the second mold core 8 are installed on the second workbench 55. The tenth motor 52 drives the second workbench 55, the first mold core 7 and the second mold core 8 to move upward, so that the first mold core 7 is pulled out from the outer shell 1.

[0052] The fourth motor 34 drives the first robotic arm 35, the outer shell 1, the first slider 25 and the second slider 26 to translate onto the first receiving platform 40. The first robotic arm 35 returns, while the outer shell 1, the first slider 25 and the second slider 26 remain on the first receiving platform 40.

[0053] The tenth motor 52 drives the second mold core 8 to move downward, so that the second mold core 8 and the inner blank 6 are inserted into the outer shell 1, so that the bottle mouth of the inner blank 6 is tightly joined with the bottle mouth of the outer shell 1.

[0054] The fifth motor 36 drives the third top block 37 to move forward. The third top block 37 pushes the second top block 13. The second top block 13 drives the second fixed block 14 and the second insert pin 12 to move downward. The cone at the front end of the second insert pin 12 leaves the cone hole at the front end of the second mold core 8. The groove on the second insert pin 12 is connected to the cone-shaped gap to form the second air channel 17.

[0055] Air is blown into the inner blank 6 through the second air channel 17 to inflate it, and air is blown into the interlayer 4 through the third air channel 27. By adjusting the gap distance between the outer shell 1 and the inner shell 2 through the air pressure difference, the inner blank 6 is blow-molded into the inner shell 1 and cooled to set.

[0056] The air inside the interlayer 4 is evacuated through the third air channel 27, so that a vacuum is formed in the hollow interlayer 4 between the outer shell 1 and the inner 2.

[0057] The seventh motor 42 drives the slide table 43 forward, the right robot arm 45 grabs the first slider 25, and the left robot arm 46 grabs the second slider 26.

[0058] The eighth motor 44 drives the right robotic arm 45 and the left robotic arm 46 to move outward synchronously, causing the first slider 25 and the second slider 26 to move outward synchronously, so that the first slider 25 and the second slider 26 are separated from the bottle mouth of the outer shell 1.

[0059] The ninth motor 47 drives the fifth top block 48 forward, and the fifth top block 48 rotates the plug 49, so that the plug 49 quickly blocks the opening after the first slider 25 is pulled out; and blocks the opening of the third air channel 27 on the bottle mouth of the outer shell 1.

[0060] The tenth motor 52 drives the second mold core 8 to move upward, the seventh motor 42 and the eighth motor 44 drive the first slider 25 and the second slider 26 to move onto the second receiving platform 41, the first slider 25 and the second slider 26 remain on the second receiving platform 41, and the seventh motor 42 drives the right robot arm 45 and the left robot arm 46 to return.

[0061] The second fixed mold 50, the second moving mold 51, the outer shell 1 and the inner shell 2 form a mold cavity for the sealing ring 5. The sealing ring 5 is injection molded in the mold cavity to seal and fix the outer shell 1 and the inner shell 2, forming an integrated double-layer vacuum plastic bottle.

[0062] The tenth motor 52 drives the second mold core 8 to move upward, and the second mold core 8 detaches from the inner shell 2;

[0063] When the injection molding machine opens the mold, the second fixed mold 50 and the second moving mold 51 are opened, and the double-vacuum plastic bottle falls onto the conveyor belt 58, which outputs the plastic bottle.

[0064] Each of the four workbenches is equipped with a first mold core 8 and a second mold core 9, for a total of four sets. The processes under the four workbenches are carried out simultaneously and production begins. The first mold only injects the outer blank 5, and the second mold starts to inject the outer blank 5 and the inner blank 6. The outer shell 1 of each mold is used for the inner blank 6 of the next mold. During the blow molding process, the first slider 25 and the second slider 26 move from the first mold core 7 to the second mold core 8. After vacuuming, the first slider 25 and the second slider 26 return to the first mold core 7.

[0065] The tenth motor 52 drives the first worktable 54, the second worktable 55, the third worktable 56 and the fourth worktable 57 to rise;

[0066] The eleventh motor 52 drives the first worktable 54, the second worktable 55, the third worktable 56 and the fourth worktable 57 to rotate 90 degrees, so that the first worktable 54 rotates to the position of the second worktable 55, the second worktable 55 rotates to the position of the third worktable 56, the third worktable 56 rotates to the position of the fourth worktable 57, and the fourth worktable 57 rotates to the position of the first worktable 54.

[0067] The tenth motor drives the first worktable 54, the second worktable 55, the third worktable 56, and the fourth worktable 57 to descend;

[0068] The first workbench 54 is used for injection molding of the preform, the second workbench 55 is used for blow molding, the third workbench 56 is used for vacuum extraction, and the fourth workbench 57 is used for injection molding of the sealing ring 5. The workbench rises, rotates 90 degrees, and falls, in a cycle, continuously producing double-vacuum plastic bottles.

[0069] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All modifications or applications made based on the above examples are within the scope of protection of this technical solution.

Claims

1. A double-layered vacuumed plastic bottle, characterized by: First, the outer preform (5) and the inner preform (6) are injection molded. Then, the outer preform (5) is blow molded into the outer shell (1). Next, the second mold core (8) and the inner preform (6) are inserted into the outer shell (1). The bottle mouth of the inner preform (6) is tightly joined with the bottle mouth of the outer shell (1) to form a sealed hollow interlayer (4). The inner preform (6) is blow molded into the inner shell (2) inside the outer shell (1). Then, the air in the hollow interlayer (4) between the outer shell (1) and the inner shell (2) is evacuated to form a vacuum. Finally, a sealing ring (3) is injection molded to seal and fix the outer shell (1) and the inner shell (2) to form an integrated double-layer vacuum plastic bottle.

2. A double vacuum plastic bottle according to claim 1, characterized in that: The first fixed mold (9), the first moving mold (10), the first slider (25), the second slider (26) and the first mold core (7) form the mold cavity of the outer blank (5). The first fixed mold (9), the first moving mold (10) and the second mold core (8) form the mold cavity of the outer blank (5). The outer blank (5) and the inner blank (6) are injection molded in the mold cavity.

3. The double-walled vacuum plastic bottle according to claim 1, characterized in that: The first insert (18) is assembled inside the first mold core (7) to form a sealed first oil channel (24). The oil circuit flows, and the outer blank (5) is wrapped around the first mold core (7). The temperature of the first mold core (7) is controlled by the oil temperature, and the temperature of the outer blank (5) is adjusted. The second insert (12) is assembled inside the second mold core (8) to form a sealed second oil channel (16). The oil circuit flows, and the inner blank (6) is wrapped around the second mold core (8). The temperature of the second mold core (8) is controlled by the oil temperature, and the temperature of the inner blank (6) is adjusted.

4. A double-walled vacuum plastic bottle according to claim 1, characterized in that: The first mold cavity (29), the second mold cavity (31), and the third mold cavity (33) constitute the outer shell (1) blow molding cavity; The first motor (28) drives the first mold cavity (29) to move forward, the second motor (30) drives the second mold cavity (31) to move forward, the third motor (32) drives the third mold cavity (33) to move upward, the first mold core (7), the outer blank (5), the first slider (25) and the second slider (26) move downward, and the outer shell (1) blow molding cavity is closed; The sixth motor (38) drives the fourth top block (39) forward. The fourth top block (39) pushes the first top block (20) forward. The first top block (20) drives the first fixed block (21) and the first insert (19) downward. The cone at the front end of the first insert (19) leaves the cone hole at the front end of the first mold core (7) to form a gap. The groove on the first insert (19) is connected to the cone gap to form the first air channel (24). Air is blown in through the first air channel (24) to blow the outer blank (5) into the outer shell (1). After cooling and shaping, the first motor (28) drives the first mold cavity (29) to move backward, the second motor (30) drives the second mold cavity (31) to move backward, and the third motor (32) drives the third mold cavity (33) to move downward, opening the blow molding cavity of the outer shell (1).

5. A double-vacuum plastic bottle according to claim 1, characterized in that: The fourth motor (34) drives the first robotic arm (35) to translate, and the first robotic arm (35) grabs the first slider (25) and the second slider (26). The first mold core (7) and the second mold core (8) are mounted on the second workbench (55). The tenth motor (52) drives the second workbench (55), the first mold core (7) and the second mold core (8) to move upward, so that the first mold core (7) is pulled out from the outer shell (1). The fourth motor (34) drives the first robotic arm (35), the outer shell (1), the first slider (25) and the second slider (26) to translate onto the first receiving platform (40). The first robotic arm (35) returns, and the outer shell (1), the first slider (25) and the second slider (26) remain on the first receiving platform (40). The tenth motor (52) drives the second mold core (8) to move downward, so that the second mold core (8) and the inner blank (6) are inserted into the outer shell (1), so that the bottle mouth of the inner blank (6) is tightly joined with the bottle mouth of the outer shell (1); The fifth motor (36) drives the third top block (37) forward, the third top block (37) pushes the second top block (13) forward, the second top block (13) drives the second fixed block (14) and the second insert (12) downward, the cone at the front end of the second insert (12) leaves the cone hole at the front end of the second mold core (8), the groove on the second insert (12) is connected with the cone gap to form the second air channel (17). Air is blown into the inner blank (6) through the second air channel (17) and air is blown into the interlayer (4) through the third air channel (27). By adjusting the gap distance between the interlayer (4) of the outer shell (1) and the inner shell (2) through the air pressure difference, the inner blank (6) is blown into the inner shell (1) and cooled to solidify.

6. A double-vacuum plastic bottle according to claim 1, characterized in that: The air in the interlayer (4) is removed by the third air channel (27), so that the hollow interlayer (4) between the outer shell (1) and the inner shell (2) forms a vacuum; The seventh motor (42) drives the slide (43) forward, the right robot (45) grabs the first slider (25), and the left robot (46) grabs the second slider (26). The eighth motor (44) drives the right robotic arm (45) and the left robotic arm (46) to move outward synchronously, so that the first slider (25) and the second slider (26) move outward synchronously, so that the first slider (25) and the second slider (26) are separated from the bottle mouth of the outer shell (1); The ninth motor (47) drives the fifth top block (48) forward, and the fifth top block (48) rotates the plug (49), so that the plug (49) quickly blocks the opening after the first slider (25) is pulled out; and blocks the opening of the third air channel (27) on the bottle mouth of the outer shell (1); The tenth motor (52) drives the second mold core (8) to move upward, the seventh motor (42) and the eighth motor (44) drive the first slider (25) and the second slider (26) to move onto the second receiving platform (41), the first slider (25) and the second slider (26) remain on the second receiving platform (41), and the seventh motor (42) drives the right robot (45) and the left robot (46) to return.

7. A double-walled vacuum plastic bottle according to claim 1, characterized in that: The mold cavity of the sealing ring (5) is composed of the second fixed mold (50), the second moving mold (51), the outer shell (1) and the inner shell (2). The sealing ring (5) is injection molded in the mold cavity to seal and fix the outer shell (1) and the inner shell (2) to form an integrated double-layer vacuum plastic bottle. The tenth motor (52) drives the second mold core (8) to move upward, and the second mold core (8) disengages from the inner shell (2); When the injection molding machine opens the mold, the second fixed mold (50) and the second moving mold (51) are opened, and the double-vacuum plastic bottle falls onto the conveyor belt (58), and the conveyor belt (58) outputs the plastic bottle.

8. A double-vacuum plastic bottle according to claim 1, characterized in that: The tenth motor (52) drives the first worktable (54), the second worktable (55), the third worktable (56) and the fourth worktable (57) to rise; The eleventh motor (52) drives the first worktable (54), the second worktable (55), the third worktable (56) and the fourth worktable (57) to rotate 90 degrees, so that the first worktable (54) rotates to the position of the second worktable (55), the second worktable (55) rotates to the position of the third worktable (56), the third worktable (56) rotates to the position of the fourth worktable (57), and the fourth worktable (57) rotates to the position of the first worktable (54); The tenth motor (52) drives the first worktable (54), the second worktable (55), the third worktable (56) and the fourth worktable (57) to descend; The first workbench (54) injects the preform, the second workbench (55) blow-molding, the third workbench (56) draws a vacuum, and the fourth workbench (57) injects the sealing ring (5). The workbench rises, rotates 90 degrees, and falls, and cycles continuously to produce double-vacuum plastic bottles.

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