Separation device for separating double-walled plastic bottles

Abstract

This invention relates to a separation device for separating double-walled plastic bottles. The double-walled plastic bottle has an outer shell and an inner liner. The bottom of the outer shell has an opening. The separation device includes: an air suction component for partially extending into the inner liner to evacuate air from the inner liner to reduce the air pressure inside; and a support squeezing component having a squeezing ramp for abutting against and squeezing the bottom of the outer shell to open the opening. The separation device of this invention for separating double-walled plastic bottles can utilize the squeezing ramp to abut against and squeeze the bottom of the outer shell, opening the opening at the bottom of the outer shell, thus facilitating the separation of the outer shell and the inner liner.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a separation device for separating double-walled plastic bottles. Background Technology

[0002] Double-walled plastic bottles are commonly used for filling pharmaceuticals and cosmetics. They consist of two layers: an outer rigid shell typically made of PE (polyethylene) and an inner flexible liner typically made of PP (polypropylene). The inner liner is approximately 0.1 mm thick and completely sealed at the bottom. The outer shell has an opening at the bottom, approximately 0.01 mm to 1 mm wide. After liquid is filled, as the liquid is drawn out, the inner liner contracts, effectively preventing outside air from being drawn back into the bottle and contaminating the contents. When air is drawn out from the inner liner, outside air can enter the gap between the outer and inner liner through this opening, making it less likely for the liner to adhere to the outer shell and facilitating separation.

[0003] However, due to manufacturing processes and other reasons, there may be material adhering to the bottom opening of the outer shell before bottling, making the opening gap less than 0.01mm. The smaller opening gap makes it difficult for external air to enter between the outer shell and the inner liner. The outer shell and the inner liner are tightly adhered together due to the vacuum negative pressure. If only air is pumped out, the inner liner will remain adhered to the inner wall of the outer shell due to the vacuum negative pressure between the outer shell and the inner liner. The inner liner cannot be separated from the inner wall of the outer shell, resulting in the liquid inside the bottle not being able to be sucked out. Summary of the Invention

[0004] Based on the aforementioned deficiencies in the prior art, the purpose of this invention is to provide a separation device for separating double-layered plastic bottles, which can use a pressing inclined surface to abut and press the bottom of the outer shell, opening the opening at the bottom of the outer shell, so as to facilitate the separation of the outer shell and the inner liner.

[0005] Therefore, the present invention provides the following technical solution.

[0006] The present invention provides a separation device for separating double-walled plastic bottles. The double-walled plastic bottles have an outer shell and an inner liner. The bottom of the outer shell has an opening. The separation device includes: an air suction component for partially extending into the inner liner to evacuate air from the inner liner to reduce the air pressure inside the inner liner; and a support extrusion component having an extrusion ramp for abutting against the bottom of the extrusion outer shell to open the opening.

[0007] In at least one embodiment, the suction assembly includes a straw for insertion into the inner liner 12.

[0008] In at least one embodiment, the suction assembly further includes a pressure head for pressing the mouth of the double-walled plastic bottle, with one end of the straw connected to the pressure head and the other end inserted into the inner liner.

[0009] In at least one embodiment, the suction assembly further includes a straw, one end of which is connected to the pressure head and the other end of which is inserted into the inner liner.

[0010] The suction assembly also includes a first seal, which is embedded in the pressure head and is used to seal the mouth of the double-walled plastic bottle.

[0011] In at least one embodiment, when the straw is inserted into the inner liner and the pressure head abuts against the double-walled plastic bottle, the length of the portion of the straw extending into the inner liner is in the range of 1 / 3 to 2 / 3 of the depth of the inner liner.

[0012] In at least one embodiment, the extrusion slope is a planar or arc-shaped surface.

[0013] In at least one embodiment, a support groove is provided at one end of the support extruder, and an extrusion slope is provided on the side wall of the support groove.

[0014] In at least one embodiment, the support extrusion member further includes a first flow channel for communicating the support groove with the external atmosphere.

[0015] In at least one embodiment, there is always a gap between the bottom of the double-walled plastic bottle and the bottom wall of the support groove, and the opening communicates with the first flow channel through the gap.

[0016] In at least one embodiment, the first flow channel is disposed on the side wall of the support groove; and / or the first flow channel penetrates the bottom wall of the support groove.

[0017] In at least one embodiment, the separation device further includes a support assembly, the support assembly including a housing, the housing having a first mounting hole, a support extruder disposed in the first mounting hole, and a second flow channel formed on the housing, the second flow channel communicating with the first flow channel.

[0018] In at least one embodiment, the support assembly further includes a liner, which is embedded in the first mounting hole. The liner includes a guide hole and a second mounting hole that are interconnected. The diameter of the guide hole is adapted to the outer contour of the double-walled plastic bottle to guide the double-walled plastic bottle into the liner. A support extruder is disposed in the second mounting hole.

[0019] When the double-layered plastic bottle is inserted into the liner along the guide hole, the bottom of the double-layered plastic bottle can enter the second mounting hole to abut against the support extruder.

[0020] In at least one embodiment, the support assembly further includes an elastic element disposed in the first mounting hole, one end of the elastic element being connected to the support compression member and the other end being connected to the housing;

[0021] When the double-layered plastic bottle presses against the support extrusion component, it can drive the support extrusion component to compress the elastic component. When the double-layered plastic bottle separates from the support extrusion component, the support extrusion component resets under the action of the elastic component.

[0022] In at least one embodiment, the support assembly further includes a base, and the housing is disposed on the base;

[0023] The base has a third flow channel, and the support groove is connected to the outside atmosphere through the first, second and third flow channels.

[0024] The effects of the invention

[0025] In this invention, a support and extrusion member with an extrusion slope is provided, which abuts against and extrudes the bottom of the outer shell, opening the opening. Outside air can more easily enter the gap between the inner liner and the outer shell through the opened opening, reducing adhesion between the inner liner and the outer shell. At the same time, the inner liner wrinkles due to the extrusion, thus separating from the outer shell. When the air inside the bottle is drawn out from the bottle mouth, the sealed inner liner is in a negative pressure state. The pressure difference between the inside and outside can easily and completely separate the inner liner from the outer shell. Attached Figure Description

[0026] Figure 1 A schematic diagram of a separation device for separating double-walled plastic bottles is shown.

[0027] Figure 2 An exploded view of the separation device is shown.

[0028] Figure 3 A cross-sectional view of the separation device is shown.

[0029] Figure 4 A cross-sectional view of the housing, support extrusion, and base is shown.

[0030] Figure 5 A schematic diagram illustrating the principle of the inclined plane acting on the two sharp corners of the bottle bottom is shown.

[0031] Figure 6 A schematic diagram is shown showing the effect of the inclined concave arc surface on the two sharp corners of the bottle bottom.

[0032] Figure 7 A schematic diagram is shown showing the effect of the inclined, outwardly convex arc surface on the two sharp corners of the bottle bottom.

[0033] Figure 8 A schematic diagram of a double-walled plastic bottle in a compressed state is shown.

[0034] Figure 9 A schematic diagram of the supporting extrusion member is shown in yet another embodiment.

[0035] Figure 10 A cross-sectional view of the support extruder is shown in yet another embodiment.

[0036] Figure 11 A schematic diagram of the supporting extrusion member is shown in another embodiment.

[0037] Figure 12 A cross-sectional view of the support extruder is shown in another embodiment.

[0038] Figure 13 A schematic diagram showing the gap formed between the double-walled plastic bottle and the support groove is shown.

[0039] Figure 14 A schematic diagram of the structure showing the first flow channel located on the side wall of the support groove is shown.

[0040] Figure 15 A cross-sectional view is shown of the first flow channel located on the side wall of the support groove.

[0041] Figure 16 A schematic diagram of the structure of a double-walled plastic bottle is shown.

[0042] Figure 17 A cross-sectional view of a double-walled plastic bottle is shown.

[0043] Figure 18 A bottom view of a double-walled plastic bottle is shown.

[0044] Explanation of reference numerals in the attached figures

[0045] 1. Double-walled plastic bottle; 11. Outer shell; 12. Inner liner; 13. Opening; 14. Bottle bottom; 141. Sharp corner; 15. Bottle mouth; 16. Tangent line;

[0046] 2. Inhalation assembly; 21. Straw; 22. Pressure head;

[0047] 3. Supporting extruder; 31. Extrusion ramp; 32. Support groove; 33. First flow channel; 34. Side wall; 35. Bottom wall; Extension wall 36.

[0048] 4. First sealing element;

[0049] 5. Support assembly; 51. Housing; 511. First mounting hole; 512. Second flow channel; 52. Liner; 521. Guide hole; 522. Second mounting hole; 53. Elastic element;

[0050] 6. Base; 61. Third flow channel; 611. First hole; 612. Second hole;

[0051] 7. Second sealing element;

[0052] 8. Third sealing element. Detailed Implementation

[0053] To make the technical solution and beneficial effects of the present invention more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0054] In the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this invention and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limiting this invention.

[0055] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature above second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0058] The following is based on Figures 1 to 18 Detailed description of specific embodiments of the separation device according to the present invention.

[0059] In this embodiment, such as Figures 16 to 18 As shown, the double-walled plastic bottle 1 has an outer shell 11 and an inner liner 12. The bottom of the outer shell 11 has an opening 13, and as shown... Figure 16 As shown, the double-walled plastic bottle 1 also has a bottle bottom 14 (i.e., the bottom of the outer shell 11) and a bottle mouth 15, with pointed corners 141 on both sides of the bottle bottom 14.

[0060] like Figures 2 to 5 As shown, the separation device for separating double-walled plastic bottles includes an air suction assembly 2 and a support extrusion member 3. The air suction assembly 2 is used to partially extend into the inner liner 12 to extract air from the inner liner 12 to reduce the air pressure inside the inner liner. The support extrusion member 3 has an extrusion ramp 31, which is used to abut against the bottom of the extrusion shell 11 to open the opening 13.

[0061] By adopting the above technical solution, the extrusion slope 31 abuts against and extrudes the bottom of the outer shell 11, opening the opening 13. Outside air can easily enter the gap between the inner liner 12 and the outer shell 11 through the opened opening 13, reducing the adhesion between the inner liner 12 and the outer shell 11. At the same time, the inner liner 12 wrinkles due to being squeezed, thus separating from the outer shell 11. When the air inside the bottle is drawn out from the bottle mouth 15, the sealed inner liner 12 is in a negative pressure state. The pressure difference between the inside and outside can be used to easily separate the inner liner 12 from the outer shell 11 completely.

[0062] In one implementation, such as Figure 4 As shown, a support groove 32 is provided at one end of the support extrusion member 3. The support groove 32 is used to accommodate the bottle bottom 14 of the double-layer plastic bottle 1. The extrusion slope 31 is provided on the side wall of the support groove 32.

[0063] In one implementation, such as Figure 5As shown, the extrusion ramp 31 can be a plane. In this way, when the extrusion ramp 31 extrudes the bottom 14 of the double-layered plastic bottle, the bottom 14 is subjected to the reaction force F of the inclined extrusion ramp 31. The reaction force F can be decomposed into a decomposed force F1 pointing towards the axis of the bottle body. The decomposed force F1 extrudes the two sharp corners 141 of the bottom of the bottle inward. The sharp corners 141 and the opening 13 are deformed, and the opening 13 is opened. At this time, external air enters the gap between the inner liner 12 and the outer shell 11 through the opening 13. After being squeezed, part of the inner liner 12 wrinkles, which can promote the separation of the inner liner 12 and the outer shell 11.

[0064] In particular, such as Figure 11 , 12 As shown, the sidewall 34 of the support groove 32 includes an extrusion ramp 31 and an extension wall 36 extending from the extrusion ramp 31 away from the bottom wall 35. The extension wall 36 extends in the same direction as the extrusion ramp 31 and is used to limit the shaking of the double-layer plastic bottle 1. The extension wall 36 and the sidewall 34 connected to the extrusion ramp 31 form the support groove 32.

[0065] The side wall 34 of the support groove 32 can also be formed by connecting other types of walls, such as an arc-shaped wall, with the extrusion slope 31, as long as the extrusion slope 31 can extrude pressure on the bottle bottom 14 to cause the inner liner 12 and the outer shell 11 to separate.

[0066] It is understandable that the two sides of the bottle bottom 14 may not form sharp corners 141, and the bottle bottom 14 may be formed in other structural forms, as long as the squeezing slope 31 can squeeze the bottle bottom 14 to cause the inner liner 12 and the outer shell 11 to separate.

[0067] Furthermore, in this embodiment, the angle between the extrusion slope 31 and the horizontal plane is set to 1° to 89°. Preferably, this angle is set to 40° to 80°, which can generate a larger decomposition force F1 pointing towards the axis of the bottle, making the sharp corner 141 and the opening 13 more easily deformable, thus making the opening 13 easier to deform and expand, which is more conducive to the entry of external gas. The inner liner 12 is more likely to wrinkle under compression to separate from the outer shell 11. Alternatively, the angle can be set to 1° to 40° or 80° to 89°, in which case the extrusion slope 31 can achieve compression of the bottle bottom 14, and, as Figure 8 As shown, the angle between the tangent 16 at the contact point between the bottle bottom 14 and the extrusion slope 31 and the extrusion slope 31 is α. The smaller the angle α, the greater the decomposed force F1 pointing towards the axis of the bottle. When the slope angle is about 70°, the angle formed between the tangent 16 at the contact point between the bottle bottom 14 and the extrusion slope 31 and the extrusion slope 31 is relatively small.

[0068] In one embodiment, the extrusion bevel 31 can be an arc-shaped surface, for example, the extrusion bevel 31 can be... Figure 6 The concave arc surface shown or Figure 7The convex arc surface shown.

[0069] like Figure 2 , 4 As shown in Figure 11, the sidewalls constituting the support groove 32 have an annular structure. Correspondingly, the extrusion ramp 31 provided on the sidewalls of the support groove 32 is a rotation ramp, as shown in Figure 11. Figure 9 , 10 As shown, the support groove 32 includes two oppositely arranged sidewalls 34, and correspondingly, the extrusion slope 31 includes two slopes spaced apart. Optionally, the number of sidewalls 34 can be greater than two, and correspondingly, the extrusion slope 31 includes multiple slopes spaced apart.

[0070] In one implementation, such as Figure 3 As shown, the suction assembly 2 includes a straw 21 for insertion into the inner liner 12. It is understood that the straw 21 can be connected to a suction device such as a vacuum pump to suction the inner liner 12. The vacuum negative pressure can be set from -5 kPa to -100 kPa, preferably from -20 kPa to -70 kPa.

[0071] Furthermore, the suction assembly 2 may also include a pressure head 22, which is used to press the bottle opening 15 of the double-walled plastic bottle 1. A straw 21 is installed inside the pressure head 22, with one end of the straw 21 connected to the pressure head 22. When the straw 21 is inserted into the inner liner 12, the pressure head 22 can abut against the bottle opening 15 of the double-walled plastic bottle 1 for positioning. Furthermore, the interior of the straw 21 is in fluid communication with the interior of the pressure head 22, allowing the pressure head 22 to be connected to suction equipment such as a vacuum pump for suction operations.

[0072] Optionally, in one embodiment, when the straw 21 is inserted into the inner liner 12 and the pressure head 22 abuts against the double-walled plastic bottle 1, the length of the portion of the straw 21 extending into the inner liner 12 is within the range of 1 / 3 to 2 / 3 of the depth of the inner liner 12. In this way, the straw 21 can extend into the inner liner 12 to a certain length, which can avoid the situation where the inner liner 12 can only be partially separated from the outer shell 11 by simply drawing outwards through the bottle opening with negative pressure, and a portion of the inner liner 12 and the outer shell 11 are still stuck together and cannot be completely separated.

[0073] It should be understood that the pressure head 22 is not necessary, and the straw 21 can also be directly connected to the suction device to evacuate the inner liner 12.

[0074] In one implementation, such as Figure 3As shown, the suction assembly 2 also includes a first seal 4, which is embedded in the pressure head 22 to seal the bottle opening 15 of the double-walled plastic bottle 1, thereby improving suction efficiency. Optionally, the first seal 4 can be fitted onto the straw 21. The first seal 4 can be a gasket, a sealing ring, or other sealing element. In one embodiment, as... Figures 2 to 4 As shown, the separation device also includes a support assembly 5, which includes a housing 51 with a first mounting hole 511 and a support extruder 3 disposed in the first mounting hole 511.

[0075] In one implementation, such as Figures 2 to 4 As shown, the support assembly 5 also includes a liner 52, which is embedded in the first mounting hole 511. Further, the liner 52 includes a guide hole 521 and a second mounting hole 522 that are interconnected. The diameter of the guide hole 521 is adapted to the outer contour of the double-layer plastic bottle 1 to guide the double-layer plastic bottle 1 into the liner 52. The support extruder 3 is disposed in the second mounting hole 522. When the double-layer plastic bottle 1 is inserted into the liner 52 along the guide hole 521, the bottom 14 of the double-layer plastic bottle 1 can enter the second mounting hole 522 to abut against the support extruder 3.

[0076] In one implementation, such as Figures 2 to 4 As shown, the support assembly 5 also includes an elastic element 53, which is disposed in the first mounting hole 511. One end of the elastic element 53 is connected to the support extrusion member 3, and the other end is connected to the housing 51. When the double-layer plastic bottle 1 presses against the support extrusion member 3, it can drive the support extrusion member 3 to compress the elastic element 53. When the double-layer plastic bottle 1 separates from the support extrusion member 3, the support extrusion member 3 resets under the action of the elastic element 53.

[0077] In one embodiment, the elastic element 53 can be a spring, a metal sheet, a rubber ring, a bellows, or other elastic structures. The elastic element 53 provides elastic support for the double-walled plastic bottle 1, preventing it from being subjected to excessive pressure that could lead to twisting, deformation, or even breakage.

[0078] In one implementation, such as Figure 3 As shown, the elastic element 53 is a spring. Spring mounting holes can be provided on both the housing 51 and the support pressing member 3 to install the two ends of the elastic element 53 respectively. This is beneficial for the quick installation and stable movement of the elastic element 53.

[0079] In one implementation, such as Figure 9 , 10As shown, the support assembly 5 may not have the elastic element 53. When the pressure head 2 presses the double-layer plastic bottle 1, the support compression member 3 does not shift. The pressure head 2 directly applies the pressing force on the double-layer plastic bottle 1 to the support compression member 3, completing the separation of the inner liner 12 and the outer shell 11 of the double-layer plastic bottle 1. In one embodiment, as... Figures 3 to 4 As shown, the support extrusion member 3 also includes a first flow channel 33, which is used to connect the support groove 32 with the external atmosphere.

[0080] In one implementation, such as Figure 13 As shown, the double-layered plastic bottle 1 moves to its limit position under the pressure of the pressure head 2. At this time, there is a gap A between the bottom of the double-layered plastic bottle 1 and the bottom wall 35 of the support groove 32. That is, during the process of the double-layered plastic bottle 1 moving from the initial position to the limit position, there is always a gap between the bottom of the double-layered plastic bottle 1 and the bottom wall 35 of the support groove 32, so that the opening 13 communicates with the first flow channel 33 through the gap, and at the same time provides space for the opening 13 to open.

[0081] In one implementation, such as Figure 14 , 15 As shown, the first flow channel 33 is located on the side wall 34 of the support groove 32. External air enters through the first flow channel 33 into the gap between the bottom of the double-layer plastic bottle 1 and the bottom wall 35 of the support groove 32, and then enters the opening 13 through the gap.

[0082] In one implementation, such as Figures 3 to 4 As shown, a second flow channel 512 is provided on the housing 51, and the second flow channel 512 is connected to the first flow channel 33. The support groove 32 communicates with the external atmosphere through the first flow channel 33 and the second flow channel 512. Optionally, the first flow channel 33 penetrates the bottom wall 35 of the support groove 32, and the second flow channel 512 is a through hole and is located at the center of the housing 51. In particular, the first flow channel 33 may include the spring mounting hole provided on the support extrusion member 3, and the second flow channel 512 may include the spring mounting hole provided on the housing 51.

[0083] Optionally, a first flow channel 33 is provided on both the bottom wall 35 and the side wall 34 of the support groove 32, which is more conducive to the inflow of external air.

[0084] In one implementation, such as Figures 3 to 4As shown, the support assembly also includes a base 6, and a housing 51 is disposed on the base 6. The base has a third flow channel 61, and the support groove 32 communicates with the external atmosphere through the first flow channel 33, the second flow channel 512, and the third flow channel 61. Optionally, the third flow channel 61 is formed by connecting a vertically arranged first hole 611 and a horizontally arranged second hole 612. The horizontally arranged second hole 612 penetrates the base 6 and communicates with the external atmosphere. One end of the second flow channel 512 on the housing 51 communicates with the vertically arranged first hole 611, and the other end communicates with the first flow channel 33 on the support extruder 3.

[0085] In one implementation, such as Figures 2 to 3 As shown, a second sealing element 7 is also provided at the end of the housing 51 facing the pressure head 22. The second sealing element 7 is embedded in the housing 51 to form a seal between the pressure head 22 and the housing 51, preventing dust or other foreign objects from entering the separation device and affecting its use. The second sealing element 7 can be a gasket, a sealing ring, or other types of sealing element.

[0086] In one implementation, such as Figure 2 As shown, a third seal 8 is also embedded on the side of the base 6 facing the housing 51 to prevent dust or other foreign objects from entering the separation device and affecting its use. The third seal 8 can be a gasket, a sealing ring, or other type of seal.

[0087] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of the present invention and do not limit the scope of protection of this patent.

Claims

1. A separating device for separating a double-layer plastic bottle having an outer shell (11) and an inner liner (12), the bottom of the outer shell (11) being provided with an opening (13), characterized in that, The separation device comprises: an air suction assembly (2) for partially extending into the inner container (12) to perform air suction on the inner container (12) to reduce the air pressure in the inner container (12); a supporting extrusion piece (3) having an extrusion slope (31) for abutting and extruding the bottom of the outer shell (11) to open the opening (13); the air suction assembly (2) comprises a suction pipe (21) for insertion into the inner container (12); the air suction assembly (2) further comprises a pressure head (22) for pressing the bottle mouth (15) of the double-layer plastic bottle (1), one end of the suction pipe (21) being connected with the pressure head (22) and the other end being used for insertion into the inner container (12); the extrusion slope (31) is a plane or an arc surface.

2. The separation device of claim 1, wherein, the air suction assembly (2) further comprises a first sealing piece (4) embedded in the pressure head (22) for sealing the bottle mouth of the double-layer plastic bottle (1).

3. The separation device of claim 2, wherein, when the suction pipe (21) is inserted into the inner container (12) and the pressure head (22) abuts against the double-layer plastic bottle (1), the length of the part of the suction pipe (21) extending into the inner container (12) is within the range of 1 / 3 to 2 / 3 of the depth of the inner container (12).

4. The separation device of claim 1, wherein, one end of the supporting extrusion piece (3) is provided with a supporting groove (32), and the extrusion slope (31) is arranged on the side wall (34) of the supporting groove (32).

5. The separation device of claim 4, wherein, the supporting extrusion piece (3) further comprises a first flow channel (33) for enabling the supporting groove (32) to communicate with the external atmosphere.

6. The separation device of claim 5, wherein, there is always a gap between the bottom of the double-layer plastic bottle (1) and the bottom wall (35) of the supporting groove (32), and the opening (13) communicates with the first flow channel (33) through the gap.

7. The separation device of claim 5, wherein, the first flow channel (33) is arranged on the side wall (34) of the supporting groove (32); and / or the first flow channel (33) penetrates the bottom wall (35) of the supporting groove (32).

8. The separation device of claim 5, wherein, the separation device further comprises a supporting assembly (5) comprising a housing (51) formed with a first mounting hole (511), and the supporting extrusion piece (3) is arranged in the first mounting hole (511), a second flow channel (512) is formed in the housing (51) and communicates with the first flow channel (33).

9. The separation device of claim 8, wherein, the supporting assembly (5) further comprises a lining piece (52) embedded in the first mounting hole (511), and the lining piece (52) comprises a guide hole (521) and a second mounting hole (522) in communication with each other, the hole diameter of the guide hole (521) is matched with the outer contour size of the double-layer plastic bottle (1) to guide the double-layer plastic bottle (1) to be inserted into the lining piece (52); the supporting extrusion piece (3) is arranged in the second mounting hole (522). When the double-layer plastic bottle (1) is inserted into the lining piece (52) along the guide hole (521), the bottom of the double-layer plastic bottle (1) can enter the second mounting hole (522) to abut against the support extrusion piece (3).

10. The separation device of claim 8, wherein, The support assembly (5) further comprises an elastic piece (53) arranged in the first mounting hole (511), one end of the elastic piece (53) being connected with the support extrusion piece (3) and the other end being connected with the shell (51). When the double-layer plastic bottle (1) abuts against the support extrusion piece (3), the support extrusion piece (3) can be driven to compress the elastic piece (53), and when the double-layer plastic bottle (1) is separated from the support extrusion piece (3), the support extrusion piece (3) is reset under the action of the elastic piece (53).

11. The separation device of claim 8, wherein, The support assembly (5) further comprises a base (6), and the shell (51) is arranged on the base (6). The third flow channel (61) is arranged on the base (6), and the support groove (32) is in communication with the external atmosphere through the first flow channel (33), the second flow channel (512) and the third flow channel (61).

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