Core translation type cylindrical bottle injection blow molding device

Abstract

The utility model discloses a mold core translation type cylindrical bottle injection blow molding device which comprises a fixed mold base and a movable mold base, N bottle body injection molds and N + 1 bottle body blow molding molds are arranged on the fixed mold base at intervals, a plurality of bottle body injection molding cavities are formed in the bottle body injection molds, 2N injection-blowing mold core sets and 2N pairs of bottle opening injection-blowing half molds arranged on the two sides of each injection-blowing mold core set are arranged on the movable mold base, each bottle opening injection-blowing half mold comprises a bottle opening half base, bottle opening half pieces in one-to-one correspondence with bottle body injection molding cavities are arranged on the bottle opening half bases, and bottle opening forming half cavities and bottle shoulder forming half cavities are formed in the bottle opening half pieces; a demolding frame is arranged on the movable mold base in a sliding mode through a guide column, a sliding core base, a sliding supporting base and a demolding top plate are sequentially arranged below the demolding frame, a guide reset notch is formed in the lower portion of the inner side of the demolding frame, and a demolding supporting table is arranged at the position, right opposite to the lower edge of the injection mold, of the guide reset notch. The injection-blow molding device disclosed by the utility model can be used for injecting and blowing various cylindrical plastic bottles.

Description

A core-shifting cylindrical bottle injection blow molding device Technical Field

[0001] This utility model relates to an injection blow molding device, specifically a core translation injection blow molding device. Background Technology

[0002] Currently, core-translation injection blow molding devices used for injection blow molding of plastic bottles typically include a fixed mold base and a moving mold base that translates relative to the fixed mold base. The fixed mold base has N bottle injection molds and N+1 bottle blow molds arranged at intervals. The bottle injection molds have multiple injection cavities. The moving mold base has 2N+1 pairs of bottle neck connectors corresponding to the N bottle injection molds and N+1 bottle blow molds, as well as 2N sets of injection blow cores. In actual operation, the injection blow cores need to constantly move back and forth between the injection and blow molding stations, while the bottle neck connectors do not. Therefore, the bottle neck connectors need to be removed from the injection blow cores before the cores can be moved. To ensure that the bottle neck connectors can be completely removed from the injection blow cores, the moving mold side needs sufficient height, resulting in a large space occupied by the moving mold side and a less compact structure. Furthermore, the long stroke of the bottle neck half-parts takes a considerable amount of time, impacting production capacity. Additionally, traditional bottle blow molding molds require opening both half-molds to eject the molded bottle from the cavity, necessitating a drive mechanism for opening the mold. This results in a larger mold footprint, more complex structure, and higher cost. Moreover, the opening of the half-molds requires them to move a certain distance towards the moving mold opening side, increasing the moving mold's movement distance and lengthening the mold opening and closing time. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a core-translating cylindrical bottle injection blow molding device that does not require opening the bottle body blow molding mold, has a simple and compact structure, and allows the bottle mouth half-part and the core to move synchronously.

[0004] To solve the above technical problems, the technical solution adopted by this utility model is as follows: a core-shifting cylindrical bottle injection blow molding device, comprising: a fixed mold base, a movable mold base that moves relative to the fixed mold base, a demolding frame slidably disposed on a demolding base via at least a pair of guide pillars, and a demolding advance / retreat driving device for driving the demolding frame forward and backward. The fixed mold base is provided with N bottle injection molds and N+1 bottle blow molds spaced apart, i.e., the bottle injection molds are arranged between two adjacent bottle blow molds. The bottle injection molds have several bottle injection cavities, and the bottle blow molds have corresponding bottle blow cavities. A demolding top plate is sequentially disposed above the movable mold base. The system comprises a sliding support seat and a sliding core seat. The sliding support seat is fixed on the moving mold base, and the sliding core seat is slidably mounted on the sliding support seat. A mold-moving drive device is provided on the sliding support seat to drive the sliding core seat to translate. The sliding core seat has 2N injection blow molding core groups respectively arranged via core pressure plates. Each injection blow molding core group includes an injection blow molding core corresponding to the injection cavity of the bottle body in the injection mold. A pair of openable bottle neck injection blow molding halves are provided on both sides of each injection blow molding core group. Each bottle neck injection blow molding half includes a bottle neck half seat, on which bottle neck half parts corresponding one-to-one with the injection cavity of the bottle body are provided. The bottle neck half parts are provided with a bottle neck forming half cavity and a bottle shoulder forming half cavity. Correspondingly, the bottle injection mold has an annular protrusion surrounding the port of the bottle injection cavity, corresponding to the bottle shoulder forming half-cavity. This annular protrusion has an annular sealing boss near the port of the bottle injection cavity. When the mold is closed, the end face of the annular sealing boss presses against the inner wall of the bottle shoulder forming half-cavity, forming a sealing surface. A clearance gap is formed between the annular protrusion and the inner wall of the bottle shoulder forming half-cavity. Each pair of bottle neck injection blow molding half-cavities has a bottle neck half-seat elastically connected together, and each end face has a demolding guide slope arranged obliquely from bottom to top and outwards. The core platen has a wedge block, and each wedge block has a corresponding... The demolding guide slope on the side bottle neck half seat corresponds to the demolding guide slope; the demolding frame includes: a pair of demolding templates that span the corresponding ends of all bottle neck injection blow molds, that is: one demolding template spans one end of all bottle neck injection blow molds, and the other demolding template spans the other end of all bottle neck injection blow molds. The pair of demolding templates are respectively provided with downward through guide reset notches on their inner lower parts, and the guide reset notches are provided with demolding support platforms and guide reset grooves at the lower edge of the injection mold facing the injection mold, so that the pair of bottle neck injection blow molds facing the injection mold are slidably placed in the corresponding guide reset grooves; the fixed mold base is provided with guide positioning holes that correspond one-to-one with the guide pillars.

[0005] As a preferred embodiment, in the aforementioned core-translation cylindrical bottle injection blow molding device, the specific connection structure between the bottle mouth half-seats in each pair of bottle mouth injection blow molding half-molds includes: two compression springs, wherein the bottle mouth half-seats are provided with through holes for mold closing along the opening and closing direction, and a bolt is selected to fit one of the compression springs through the through holes for mold closing on both sides of the bottle mouth half-seats, and then the other compression spring is fitted on and the nut is tightened.

[0006] The bottle neck half seat has a spring mounting hole on its outer side facing the mold closing through hole, which is designed to cooperate with the compression spring, forming a stepped hole that is larger on the outside and smaller on the inside. The compression spring is set in the spring mounting hole of the corresponding bottle neck half seat.

[0007] As a preferred embodiment, in the aforementioned core-shifting cylindrical bottle injection blow molding device, the demolding advance and retreat drive device includes: an ejector rod arranged directly opposite the demolding top plate; reset pull rods are respectively provided on both sides of the demolding frame and between the demolding top plate; reset springs are sleeved on the reset pull rods; and the reset springs are disposed between the demolding top plate and the sliding support seat.

[0008] As a preferred embodiment, in the aforementioned core-translation cylindrical bottle injection blow molding device, the moving mold base is provided with ejector pin through holes corresponding to the ejector pins.

[0009] As a preferred embodiment, in the aforementioned core-shifting cylindrical bottle injection blow molding device, spring limiting seats are respectively provided on both sides of the sliding support seat. The spring limiting seats are provided with pull rod through holes that cooperate with the reset pull rod. The reset pull rod is movably inserted into the pull rod through hole on the spring limiting seat, and the upper end of the reset spring presses against the spring limiting seat.

[0010] As a preferred embodiment, in the aforementioned core-shifting cylindrical bottle injection blow molding device, a spring mounting hole for cooperating with a return spring is provided on the bottom surface of the spring limiting seat, and the return spring is disposed in the spring mounting hole on the spring limiting seat.

[0011] As a preferred embodiment, in the aforementioned core-translation cylindrical bottle injection blow molding device, the inner sides of both spring limiting seats are provided with limiting surfaces for limiting the position of the sliding core seat after translation.

[0012] As a preferred embodiment, in the aforementioned core-shifting cylindrical bottle injection blow molding device, the mold-shifting drive device is a cylinder.

[0013] As a preferred embodiment, in the aforementioned core-shifting cylindrical bottle injection blow molding device, the demolding frame is provided with guide post mounting holes corresponding to the guide posts, and guide sleeves are provided in the guide post mounting holes, with the guide posts movably disposed in the corresponding guide sleeves.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model unifies the design of injection molds and blow molds into a split structure, namely: the injection mold and the blow mold are respectively composed of a bottle body injection mold and a bottle body blow mold, and a pair of bottle neck injection blow molds with the same structure. This allows each pair of bottle neck injection blow molds to move together when the injection blow core is translated, thus eliminating the need to spend time removing them from the injection blow core, shortening the mold opening stroke of the bottle neck injection blow molds, thereby shortening the mold opening time of the bottle neck injection blow molds and improving production capacity; moreover, it also reduces the height of the moving mold side, making the structure of the moving mold side more compact and reducing material costs.

[0016] 2. This utility model sets the bottle shoulder forming half cavity on the bottle mouth half part, retaining only the cavity corresponding to the straight cylindrical part of the bottle body on the bottle body injection mold and bottle body blow mold. In this way, the bottle body blow mold does not need to be opened and closed, and the formed bottle is directly pulled out from the straight cylindrical cavity, thereby reducing the mold opening distance of the moving mold, making the structure on the moving mold side more compact, and further reducing material costs. Furthermore, by setting an annular protrusion corresponding to the bottle shoulder forming half cavity around the port of the bottle body injection cavity on the bottle body injection mold, the annular protrusion has an annular sealing boss near the port of the bottle body injection cavity. When the mold is closed, the end face of the annular sealing boss presses against the inner wall of the bottle shoulder forming half cavity to form a sealing surface, ensuring the normal progress of the injection molding process. In addition, because there is a clearance between the annular protrusion and the inner wall of the bottle shoulder forming half cavity, the contact area between the injection blow molding part and the bottle body injection mold and the bottle body blow molding mold is reduced when the mold is closed, thereby extending the service life of the bottle body injection mold, the bottle body blow molding mold and the injection blow molding part.

[0017] 3. The guide reset notch of this utility model is provided with a demolding support platform at the lower edge of the injection mold, forming a guide reset groove. This allows a pair of bottle neck injection blow mold halves facing the injection mold to be bound in the corresponding guide reset groove. Thus, the bottle neck injection blow mold halves can be pushed and opened at the injection station by the demolding support platform, and the molded plastic bottle can be demolded from the injection blow core. This allows the time for switching the injection blow core station to overlap with the cooling time of the plastic bottle, thereby further improving production capacity and reducing production costs.

[0018] 4. This utility model has a through hole for mold closing on the bottle mouth half seat along the opening and closing direction, and then uses two bolts, nuts and two compression springs to elastically connect a pair of bottle mouth injection mold half-die. Its structure is very simple and practical, which greatly reduces the manufacturing cost.

[0019] 5. This utility model has a spring mounting hole that matches the compression spring by opening a through hole on the outside of the bottle mouth half seat directly opposite the mold closing hole. On the one hand, the extension and contraction of the compression spring is more stable. On the other hand, since the compression spring does not occupy external space, the structure is more compact and can further reduce manufacturing costs.

[0020] 6. This utility model provides a spring mounting hole on the bottom surface of the spring limiting seat to cooperate with the return spring. On the one hand, this makes the extension and retraction of the return spring more stable. On the other hand, since the return spring does not occupy external space, the structure is more compact, which can further reduce manufacturing costs. Attached Figure Description

[0021] Figure 1 is a cross-sectional view of the injection blow molding device of this utility model when the mold is closed.

[0022] Figure 2 is a cross-sectional view of the injection blow molding device of this utility model when the mold is opened.

[0023] Figure 3 is a schematic diagram of the arrangement structure on the fixed mold side.

[0024] Figure 4 is a schematic diagram of the arrangement structure on the moving mold side.

[0025] Figure 5 is a schematic cross-sectional view of the template removal structure along direction AA in Figure 2.

[0026] Figure 6 is a schematic cross-sectional view of the template removal structure along the BB direction in Figure 2.

[0027] Figure 7 is a partial structural diagram of Figure 1 viewed from the left.

[0028] Figure 8 is an enlarged structural diagram of part E in Figure 1.

[0029] Figure 9 is a schematic diagram of the structure when a pair of bottle neck injection blow molding half molds are closed.

[0030] Figure 10 is a schematic diagram of the structure of a pair of bottle neck injection blow molding half molds when the mold is opened.

[0031] The reference numerals in Figures 1 to 10 are as follows: 1. Fixed mold base; 11. Guide positioning hole; 111. Guide sleeve; 15. Hot runner; 2. Moving mold base; 201. Ejector pin through hole; 21. Guide post; 3. Bottle injection mold; 37. Bottle injection cavity; 4. Bottle blow mold; 45. Annular protrusion; 451. Annular sealing boss; 47. Bottle blow cavity; 5. Demolding frame; 51. Demolding support plate; 511. Guide sleeve; 52. Demolding plate; 521. Reset boss; 522. Guide reset notch; 523. Guide reset slide; 528. Demolding support platform; 53. Reset pull rod; 55. Reset spring; 6. Demolding top plate; 60. Ejector pin; 7. Injection blow core; 70. Sliding support seat; 71. Sliding core seat; 710. Mold moving cylinder. 72. Core platen; 75. Spring limit seat; 751. Spring mounting hole; 752. Pull rod through hole; 753. Limiting surface; 8. Bottle neck injection mold half; 80. Bottle neck half seat; 8001. Mold closing through hole; 8002. Spring mounting hole; 8011. Demolding guide slope; 803. Demolding boss; 81. Bottle neck half part; 811. Bottle neck forming half cavity; 812. Bottle shoulder forming half cavity; 813. Sealing surface; 815. Clearance gap; 83. Wedge block; 830. Base; 831. Angled guide platform; 8311. Demolding guide slope; 832. Neck-shaped connection; 84. Connecting bolt; 85. Compression spring; 86. Compression spring; 87. Limiting nut; 88. Tightening nut; 91. Plastic preform; 92. Plastic bottle. Detailed Implementation

[0032] The following describes in detail, with reference to the accompanying drawings, the specific implementation scheme of the core-shifting cylindrical bottle injection blow molding device of this utility model.

[0033] As shown in Figures 1 and 2, the core-translating cylindrical bottle injection blow molding device of this utility model includes: a fixed mold base 1, a movable mold base 2 that translates relative to the fixed mold base 1, a demolding frame 5 slidably mounted on the movable mold base 2 via four guide posts 21 respectively located at the four corners of the movable mold base 2, and a demolding advance / retreat driving device for driving the demolding frame 5 forward and backward. The fixed mold base 1 is provided with two bottle injection molds 3 and three bottle blow molds 4 spaced apart, that is, the bottle injection molds 3 are arranged between two adjacent bottle blow molds 4. The moving mold base 2 has eight injection molding cavities 37 for the bottle body, and the bottle blow molding mold 4 has eight corresponding bottle blow molding cavities 47 (see Figure 3). Above the moving mold base 2, a demolding top plate 6, a sliding support seat 70, and a sliding core seat 71 are sequentially arranged. The sliding support seat 70 is fixed to the moving mold base 2, and the sliding core seat 71 is slidably disposed on the sliding support seat 70 (this is conventional technology in the art and will not be described further here). The sliding support seat 70 is equipped with a mold moving cylinder 710 as a mold moving drive device (used to drive the sliding core seat 71). (Translation), the sliding core seat 71 is provided with four injection blow molding core groups through four pairs of core pressure plates 72. Each injection blow molding core group includes eight injection blow molding cores 7 corresponding to eight bottle body injection molding cavities 37 in the bottle body injection mold 3. Each injection blow molding core group has a pair of openable bottle neck injection blow molding half molds 8 on both sides. The bottle neck injection blow molding half mold 8 includes a bottle neck half seat 80. The bottle neck half seat 80 is provided with bottle neck half parts 81 corresponding one-to-one with the bottle body injection molding cavities 37, as shown in Figure 8. The bottle neck half parts 81 are provided with bottle neck forming. The half cavity 811 and the bottle shoulder forming half cavity 812 are respectively provided. Correspondingly, the bottle body injection mold 3 is provided with an annular protrusion 45 around the port of the bottle body injection cavity 37, which corresponds to the bottle shoulder forming half cavity 812. The annular protrusion 45 is provided with an annular sealing boss 451 near the port of the bottle body injection cavity 37. When the mold is closed, the end face of the annular sealing boss 451 presses against the inner wall of the bottle shoulder forming half cavity 812 to form a sealing surface 813, and an avoidance gap 815 is formed between the annular protrusion 45 and the inner wall of the bottle shoulder forming half cavity 812.The bottle neck half-mounts 80 in each pair of bottle neck injection mold half-mounts 8 are elastically connected together, as shown in Figures 9 and 10. The specific connection structure includes two compression springs 85 and 86. Each bottle neck half-mount 80 has a mold-closing through hole 8001 along the opening and closing direction. On its outer side, directly opposite the mold-closing through hole 8001, the bottle neck half-mount 80 has a spring mounting hole 8002 that mates with the compression spring, forming a stepped hole that is larger on the outside and smaller on the inside. After the compression spring 85 is fitted onto the connecting bolt 84, it passes sequentially through the spring mounting hole 8002 and the mold-closing through hole 8001 on one side (the left side in Figures 9 and 10), and then sequentially through the bottle neck half-mount 80 on the other side (the right side in Figures 8 and 9). After the compression spring 86 is inserted through the through hole 8001 and the spring mounting hole 8002 of the mold 0, the upper limit nut 87 and the tightening nut 88 are tightened. Each bottle neck half seat 80 in the bottle neck injection mold 8 has a demolding guide slope 8011 arranged from bottom to top and outward on its opposite end faces. The core pressure plate 72 is provided with a wedge block 83, which includes: a base 830 and a slope guide platform 831 set on the base 830 through a neck-shaped connecting part 832. The slope guide platform 831 has a demolding guide slope 8311 on both sides corresponding to the demolding guide slope 8011 on the corresponding bottle neck half seat 80. The moving mold base 2 is provided with four Demolding frames 5 are slidably mounted on guide posts 21 located at the four corners of the mold. Each demolding frame 5 includes a pair of demolding templates 52 arranged towards the corresponding ends of all the bottle neck injection mold halves 8, and a pair of demolding support plates 51 connected to the corresponding ends of these templates 52, forming a square frame structure. The demolding support plates 51 have guide post mounting holes corresponding to the guide posts 21, and guide sleeves 511 are installed in these holes. The guide posts 21 are movably mounted in the corresponding guide sleeves 511, as shown in Figures 4 to 7. Each pair of demolding templates 52 has a downwardly penetrating guide reset notch 522 on its lower inner side, forming a reset boss 521. Furthermore, the guide reset notch 522 is positioned directly opposite the bottle injection mold 3. A demolding support 528 is provided at the lower edge, forming a guide reset slide groove 523. The bottle mouth injection blow mold 8 is provided with a demolding boss 803 corresponding to the guide reset slide groove 523, so that the demolding bosses 803 on each pair of bottle mouth injection blow molds 8 facing the bottle body injection mold 3 are slidably positioned in the corresponding guide reset slide groove 523. The fixed mold base 1 is provided with guide positioning holes 11 corresponding to the guide pillars 21, and guide sleeves 111 are provided in the guide positioning holes 11. The demolding advance and retreat drive device includes: an ejector rod 60 arranged facing the demolding top plate 6, and an ejector rod through hole 201 corresponding to the ejector rod 60 is provided on the moving mold base 2 (which is a conventional technology in the art and will not be described in detail here).A reset pull rod 53 is respectively provided between the pair of demolding support plates 51 and the demolding top plate 6. A reset spring 55 is sleeved on the reset pull rod 53. The reset spring 55 is located between the demolding top plate 6 and the sliding support seat 70. Specifically, the sliding support seat 70 is provided with a spring limiting seat 75. The bottom surface of the spring limiting seat 75 has a spring mounting hole 751 that cooperates with the reset spring 55. The bottom wall of the spring mounting hole 751 has a spring positioning hole 751 that cooperates with the reset spring 55. The pull rod 53 is fitted with a pull rod through hole 752. After the reset pull rod 53 is fitted with the reset spring 55, it passes through the spring mounting hole 751 and the pull rod through hole 752 on the spring limiting seat 75. The upper end of the reset spring 55 abuts against the bottom wall of the spring mounting hole 751 on the spring limiting seat 75. In this embodiment, the inner sides of the spring limiting seats 75 on both sides are provided with limiting surfaces 753 for limiting the position of the sliding core seat 71 after translation, so that the sliding core seat 71 is more accurately positioned after translation.

[0034] In practical applications, the demolding and pushing device equipped with the ejector rod 60 is installed on the body of the translational injection blow molding machine.

[0035] The working process of this utility model is as follows: the mold closes, the plasticized plastic enters the injection cavity 37 of the bottle body through the hot runner 15, and after the preform 91 is formed by temperature control, the mold opens, the moving mold retracts, and the bottle neck injection blow molding half mold 8 and injection blow core 7, along with the preform 91, are ejected from the injection cavity 37. After the moving mold retracts to the set position, the mold moving cylinder 710 drives the sliding core seat 71, the injection blow core 7 above it, and the bottle neck injection blow molding half mold 8 to move a distance, so that the bottle neck carrying the preform 91... The blow molding core 7 and the preform 91 are aligned with the bottle body blow molding mold 4. The blow molding core 7 of the preform 91 is aligned with the bottle body injection molding mold 3. After the mold is closed, the plasticized plastic enters the bottle body injection cavity 37 through the hot runner 15. The preform is formed under temperature control. At the same time, the blow molding core 7 opens the air inlet to allow air to enter and push the piston to open the core head (this is a conventional technique in the art and will not be described in detail here). Compressed air is blown into the blow molding core 7 in the bottle body blow molding cavity 47 through the corresponding air inlet and passes through the air passage to the piston. Air is blown out from the air inlet between the moving mold core and the core body (this is a conventional technique in the field and will not be described in detail here). After blowing for a certain period of time, the plastic bottle 92 is cooled and formed. After the preform and blow molding are completed, the moving mold retracts. The injection blow core 7 and the bottle neck injection blow mold 8 on the injection station retract with the plastic preform 91. The injection blow core 7 and the bottle neck injection blow mold 8 on the blow molding station retract with the formed plastic bottle 92. After the moving mold retracts into place, the mold moving cylinder 710 drives the sliding core seat 71 and the injection blow mold on it. The core 7 and the bottle neck injection blow mold 8 move a distance, the blow-molded plastic bottle 92 on the blow molding station moves to the injection molding station, the preform 91 on the injection molding station moves to the corresponding blow molding station, the demolding frame 5 pushes forward, and the bottle neck injection blow mold 8 with the plastic bottle 92 is pushed forward and opened by the demolding support 528 on the demolding plate 52 to remove the plastic bottle 92 from the injection blow core 7. Then the demolding plate retracts, and the bottle neck injection blow mold 8 with the plastic bottle 92 removed returns to its original position. This cycle repeats.

[0036] In summary, the above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes and modifications made to the shape, structure, features and spirit described in the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. A core shift parison blow molding apparatus comprising: A fixed mold base and a movable mold base that translates relative to the fixed mold base, characterized in that the fixed mold base is provided with N bottle injection molds and N+1 bottle blow molds spaced apart, i.e., the bottle injection molds are arranged between two adjacent bottle blow molds, the bottle injection molds have a plurality of bottle injection cavities, and the bottle blow molds have corresponding bottle blow cavities; a demolding top plate, a sliding support base, and a sliding core base are sequentially arranged above the movable mold base, the sliding support base is fixed on the movable mold base, the sliding core base is slidably disposed on the sliding support base, and the sliding support base is provided with a mold transfer driving device for driving the sliding core base to translate. The moving core holder is equipped with 2N injection blow molding core assemblies via core pressure plates. Each injection blow molding core assembly includes an injection blow molding core corresponding to the injection cavity of the bottle body in the injection mold. A pair of openable bottle neck injection blow molding halves are provided on both sides of each injection blow molding core assembly. The bottle neck injection blow molding halves include a bottle neck half-seat, on which bottle neck half-parts corresponding to the injection cavities of the bottle body are provided. Each bottle neck half-part has a bottle neck forming half-cavity and a bottle shoulder forming half-cavity. Correspondingly, the bottle body injection mold has an annular protrusion around the port of the bottle body injection cavity, corresponding to the bottle shoulder forming half-cavity. This annular protrusion has a ring-shaped protrusion near the port of the bottle body injection cavity. The annular sealing boss, during mold closing, presses its end face against the inner wall of the bottle shoulder forming half-cavity, forming a sealing surface, while a clearance gap is formed between the annular protrusion and the inner wall of the bottle shoulder forming half-cavity; the bottle neck half-seats in each pair of bottle neck injection blow molding half-cavities are elastically connected together, and each end face has a demolding guide slope arranged from bottom to top and outward; the core platen is provided with a wedge block, and each side of the wedge block has a demolding guide slope corresponding to the demolding guide slope on the corresponding side bottle neck half-seat; the cylindrical bottle injection blow molding device also includes: a demolding frame slidably mounted on the demolding seat by at least a pair of guide pillars; And a demolding advance and retreat drive device for driving the demolding frame to advance and retreat, the demolding frame including: a pair of demolding templates that span across the corresponding ends of all bottle neck injection blow molds, that is: one demolding template spans one end of all bottle neck injection blow molds, and the other demolding template spans the other end of all bottle neck injection blow molds, the pair of demolding templates are respectively provided with downward through guide reset notches on their inner lower parts, and the guide reset notches are provided with demolding support platforms at the lower edge of the injection mold facing the injection mold, forming guide reset slides, so that the pair of bottle neck injection blow molds facing the injection mold are slidably placed in the corresponding guide reset slides; the fixed mold base is provided with guide positioning holes corresponding one-to-one with the guide pillars.

2. A core-translation type blow molding apparatus for a cylindrical container according to claim 1, wherein The specific connection structure between the bottle neck half-seats in each pair of bottle neck injection molds includes: two compression springs. The bottle neck half-seats are provided with through holes for mold closing along the opening and closing direction. A bolt is selected, one of the compression springs is put on, passes through the through holes for mold closing on both sides of the bottle neck half-seats, and then the other compression spring is put on and the nut is tightened.

3. A core shift parison blow molding apparatus according to claim 2, wherein The bottle neck half seat has a spring mounting hole on its outer side facing the mold closing through hole, which is designed to cooperate with the compression spring, forming a stepped hole that is larger on the outside and smaller on the inside. The compression spring is set in the spring mounting hole of the corresponding bottle neck half seat.

4. The core-translation type cylindrical bottle injection blow molding device according to claim 1, characterized in that, The demolding advance and retreat drive device includes: an ejector rod arranged facing the demolding top plate; reset pull rods are respectively arranged between the two sides of the demolding frame and the demolding top plate; reset springs are sleeved on the reset pull rods; and the reset springs are arranged between the demolding top plate and the sliding support seat.

5. A core shift parison blow molding apparatus according to claim 4 wherein, The moving mold base is provided with ejector through holes corresponding to the ejector rods.

6. A core shift parison blow molding apparatus according to claim 4 wherein, Spring limiting seats are respectively provided on both sides of the sliding support seat. The spring limiting seats have a pull rod through hole that cooperates with the reset pull rod. The reset pull rod is movably inserted into the pull rod through hole on the spring limiting seat, and the upper end of the reset spring abuts against the spring limiting seat.

7. The core-translation type cylindrical bottle injection blow molding device according to claim 6, characterized in that, The bottom surface of the spring limiting seat is provided with a spring mounting hole that cooperates with the reset spring, and the reset spring is set in the spring mounting hole on the spring limiting seat.

8. A core shift parison blow molding apparatus according to claim 6 wherein, Both sides of the spring limiting seats have limiting surfaces on their inner sides to limit the position of the sliding core seat after translation.

9. The core-translation type cylindrical bottle injection blow molding device according to claim 1, characterized in that, The aforementioned mold-moving drive device is a cylinder.

10. A core shift parison blow molding apparatus according to any one of claims 1 to 9, characterized in that, The demolding frame has guide post mounting holes corresponding to the guide posts, and guide sleeves are provided in the guide post mounting holes. The guide posts are movably mounted in the corresponding guide sleeves.

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