Auxiliary support structure for preventing deformation in a plastic bottle blow molding process

Abstract

The utility model provides an auxiliary support structure of preventing deformation in the process of plastic bottle blow molding, related to plastic bottle blow molding device technical field, including base, the inside of base is provided with moving block, the upper end fixed connection of moving block has mobile mould, through setting blow molding gun, blow molding head and support air bag, blow molding gun has efficient delivery, strong sealing property and multiple group adaptability, can stable transmission gas and realizes multi -position or accurate blow molding, ensures that the stress of bottle blank is even, the conical structure of blow molding head is convenient for going into bottle blank and makes medium even distribution, the detachable design of screw thread is convenient maintenance replacement, high temperature resistant characteristic adaptation blow molding environment, guarantee medium output stability, the flexibility and ring structure of support air bag are with elastic rubber, expand and fit the inner wall of bottle blank when blow molding, provide even inward supporting force, limit excessive or irregular deformation, avoid scratching bottle blank simultaneously, ensure that plastic bottle forming size is accurate, appearance is even finally, reduce deformation rate greatly.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic bottle blow molding equipment, and in particular to an auxiliary support structure for preventing deformation during the plastic bottle blow molding process. Background Technology

[0002] In the production of plastic bottles, blow molding is a crucial step. Traditional blow molding relies on a blow gun to inject compressed air into the preform, causing it to expand and solidify. However, because the preform lacks effective internal support when heated and softened, it is prone to localized overstretching or collapse due to uneven air pressure and its own weight. This results in deformed plastic bottles with uneven wall thickness and irregular shapes. Currently, common industry solutions include optimizing blow molding parameters and improving mold design. However, these methods often fail to fundamentally solve the deformation defects caused by the lack of internal support. For example, some manufacturers have tried adding simple fixing pins or protrusions to the mold for positioning assistance. However, this method not only fails to provide uniform support but also damages the preform surface due to the small contact area. In addition, some manufacturers use robotic arms to clamp the preform externally. However, because the preform is in a high-temperature softened state, external clamping can easily leave marks and makes it difficult to ensure consistent force on all parts. None of these existing solutions have effectively solved the deformation problem caused by insufficient internal support of the preform during blow molding.

[0003] A search revealed that the document with publication number "CN218615368U" states that "this utility model provides a plastic bottle blow molding equipment, characterized by: including a first mold assembly and a second mold assembly arranged opposite to each other, and the two mold assemblies can be assembled into a mold body, the mold body having a mold cavity, fins extending outward from the outer walls of the two mold assemblies respectively, with a heat dissipation space between each pair of adjacent fins; multiple through holes on the fins, and a heat dissipation pipe passing through the through holes and coiled in a serpentine manner on the outer wall of the mold assembly; a base, which is placed below the mold body, with multiple air outlets on the base, and the air outlets corresponding to the heat dissipation space." In use, the heat dissipation pipe and fins dissipate heat from the mold, while the upward blowing air lowers the temperature at the bottom of the mold, thereby increasing the cooling rate of the plastic bottle after contact with the inner wall of the mold. This ensures that the plastic bottle is in a low-temperature state after mold opening, improving the stability of the plastic and preventing deformation of the plastic bottle due to subsequent transfer and processing after mold opening.

[0004] However, traditional methods often use external clamping or local fixed-point support, which cannot provide all-round and uniform support to the inner wall of the preform. This results in uneven stress during blow molding and is prone to local deformation. At the same time, existing auxiliary devices lack flexible adjustment mechanisms for preforms of different sizes, requiring frequent tooling changes, which is inefficient and costly. Furthermore, the position adjustment of the blow molding gun relies on manual experience, making it difficult to achieve precise alignment, which further exacerbates the risk of deformation caused by misalignment.

[0005] Therefore, we provide an auxiliary support structure to prevent deformation during the blow molding process of plastic bottles, thus solving the above problems. Utility Model Content

[0006] To overcome the above deficiencies, this utility model provides an auxiliary support structure to prevent deformation during the blow molding process of plastic bottles, aiming to solve the problems mentioned above.

[0007] To achieve the above objectives, this utility model provides the following technical solution: An auxiliary support structure for preventing deformation during the blow molding process of plastic bottles includes a base, a movable block provided on the inner side of the base, a movable mold fixedly connected to the upper end of the movable block, a fixed mold provided on the left side of the movable mold, a positioning rod installed on the inner surface of the fixed mold, and an auxiliary support assembly provided on the left side of the fixed mold. The auxiliary support assembly includes a support plate installed on the left side of the fixed mold, and a connecting slide rail fixedly connected to the surface of the support plate.

[0008] As a further description of the above technical solution: The inner side of the movable mold is provided with a positioning hole that matches the positioning rod. The end of the positioning rod away from the fixed mold can be inserted into the positioning hole of the movable mold. The movable block and the base are connected by a motor drive screw structure.

[0009] As a further description of the above technical solution: A slide plate is slidably connected to the inner side of the connecting slide rail, and a connecting rod is sleeved on the inner side of the slide plate. A drive cylinder is fixedly connected to the upper end of the connecting rod, and the bottom end of the connecting rod is welded to the base.

[0010] As a further description of the above technical solution: A connecting plate is fixedly connected to the lower end of the skateboard, and a fixing plate is fixedly connected to the right side of the connecting plate. The fixing plate is a rectangular plate structure and is made of high-strength alloy material.

[0011] As a further description of the above technical solution: A blow molding gun is installed on the inner side of the fixed plate. A working chamber is provided on the left side of the blow molding gun. The working chamber is connected to the blow molding gun through a pipe. There are a total of four sets of blow molding guns.

[0012] As a further description of the above technical solution: The lower end of the blow molding gun is equipped with a blow molding head, which has a conical structure and is detachably connected to the blow molding gun via threads. The blow molding head is made of high-temperature resistant plastic material.

[0013] As a further description of the above technical solution: The outer side of the blow molding head is fitted with a support airbag, which is a ring-shaped structure and made of elastic rubber material.

[0014] Compared with the prior art, the beneficial effects of this utility model are: By setting up connecting slide rails, slide plates, connecting rods, and drive cylinders, precise positioning of blow molding components is achieved in a coordinated manner. The connecting slide rails, with their strong stability and high fitting precision, provide unidirectional guidance for the slide plate, avoiding blow molding misalignment caused by offset. The slide plate, with its high load-bearing capacity and rigidity, stably transmits power and prevents its own deformation, ensuring the precise positioning of the blow molding gun. The connecting rods, with their high connection strength and adaptability, efficiently connect the drive cylinder and the slide plate, reducing power transmission loss. The drive cylinder, through stable and controllable power output, rapid response, and compact structure, precisely adjusts the slide plate displacement to adapt to the needs of different preform sizes, shortening positioning time and laying the foundation for stable blow molding. This reduces the risk of preform deformation from the position adjustment level.

[0015] By incorporating a blow molding gun, blow molding head, and support airbag, the blow molding gun offers efficient delivery, strong sealing, and multiple adaptability. It can stably transmit gas and achieve multi-station or precision blow molding, ensuring uniform force on the preform. The conical structure of the blow molding head facilitates deep penetration into the preform and ensures uniform media distribution. The detachable threaded design facilitates maintenance and replacement. Its high-temperature resistance adapts to the blow molding environment, ensuring stable media output. The support airbag, with its flexible rubber and ring structure, expands and conforms to the inner wall of the preform during blow molding, providing uniform inward support, limiting excessive or irregular deformation, and preventing scratches on the preform. Ultimately, this ensures accurate plastic bottle dimensions, a smooth appearance, and significantly reduces deformation rates. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model; Figure 2 This is a schematic diagram of the cooperation structure between the base and the auxiliary support components of this utility model; Figure 3 This is a schematic diagram of the mating structure of the base and the blow molding mold of this utility model; Figure 4 This is a schematic diagram of the auxiliary support component structure of this utility model.

[0017] The following are the labeling elements in the diagram: 1. Base; 2. Moving block; 3. Moving mold; 4. Fixed mold; 5. Positioning rod; 6. Auxiliary support assembly; 601. Support plate; 602. Connecting slide rail; 603. Slide plate; 604. Connecting rod; 605. Drive cylinder; 606. Connecting plate; 607. Fixed plate; 608. Blow molding gun; 609. Working chamber; 6010. Blow molding head; 6011. Support airbag. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 As shown, this utility model provides a technical solution: an auxiliary support structure for preventing deformation during the blow molding process of plastic bottles, including a base 1, a movable block 2 is provided on the inner side of the base 1, a movable mold 3 is fixedly connected to the upper end of the movable block 2, a fixed mold 4 is provided on the left side of the movable mold 3, a positioning rod 5 is installed on the inner surface of the fixed mold 4, an auxiliary support component 6 is provided on the left side of the fixed mold 4, the auxiliary support component 6 includes a support plate 601 installed on the left side of the fixed mold 4, and a connecting slide rail 602 is fixedly connected to the surface of the support plate 601.

[0020] Furthermore, the inner side of the movable mold 3 is provided with a positioning hole that matches the positioning rod 5. The end of the positioning rod 5 away from the fixed mold 4 can be inserted into the positioning hole of the movable mold 3. The movable block 2 and the base 1 are connected by a motor-driven screw structure. By matching the positioning rod 5 with the positioning hole on the inner side of the movable mold 3, the movable mold 3 is accurately positioned when docking with the fixed mold 4, avoiding mold misalignment that affects the quality of blow-molded products. At the same time, the movable block 2 is driven to move by the motor-driven screw structure, providing stable and controllable power for the opening and closing of the movable mold 3, ensuring that the mold opening and closing action is accurate and reliable.

[0021] Furthermore, a slide plate 603 is slidably connected to the inner side of the connecting slide rail 602, and a connecting rod 604 is sleeved on the inner side of the slide plate 603. A drive cylinder 605 is fixedly connected to the upper end of the connecting rod 604, and the bottom end of the connecting rod 604 is welded to the base 1. The drive cylinder 605 drives the slide plate 603 to slide along the connecting slide rail 602 on the surface of the support plate 601. The connecting plate 606 at the lower end of the slide plate 603 simultaneously drives the fixed plate 607 to move, thereby adjusting the auxiliary support position to adapt to the blow molding requirements at different stages.

[0022] Furthermore, a connecting plate 606 is fixedly connected to the lower end of the slide plate 603, and a fixing plate 607 is fixedly connected to the right side of the connecting plate 606. The fixing plate 607 is a rectangular plate structure and is made of high-strength alloy material. The connecting plate 606 acts as a connecting bridge to fix the slide plate 603 and the fixing plate 607, so that the displacement of the slide plate 603 can be synchronously transmitted to the fixing plate 607. The fixing plate 607 is made of high-strength alloy material and has sufficient structural strength to provide stable installation support for the blow molding gun 608, preventing the blow molding gun 608 from displacing due to vibration or force during the blow molding process, and ensuring the stable operation of the blow molding.

[0023] Furthermore, a blow molding gun 608 is installed on the inner side of the fixing plate 607, and a working chamber 609 is provided on the left side of the blow molding gun 608. The working chamber 609 is connected to the blow molding gun 608 through a pipe. There are four sets of blow molding guns 608. The working chamber 609 serves as a gas source and a storage and control unit for the blow molding medium. High-pressure gas or the medium required for blow molding is delivered to the blow molding gun 608 through the pipe. The four sets of blow molding guns 608 can realize multi-station synchronous blow molding or precise blow molding of different parts of a single product according to the blow molding requirements of plastic bottles, thereby improving blow molding efficiency and product quality. At the same time, multiple sets of blow molding guns 608 can also enhance the stability of the blow molding process and reduce the risk of product deformation.

[0024] Furthermore, a blow molding head 6010 is installed at the lower end of the blow molding gun 608. The blow molding head 6010 has a conical structure and is detachably connected to the blow molding gun 608 via a thread. The blow molding head 6010 is made of high-temperature resistant plastic material. The conical design of the blow molding head 6010 facilitates deep penetration into the plastic preform and allows the blown gas or medium to be evenly distributed on the inner wall of the preform, promoting uniform preform molding and reducing local deformation. The threaded detachable connection facilitates the replacement and maintenance of the blow molding head 6010. When the blow molding head 6010 is worn, damaged, or needs to be adapted to different product specifications, it can be quickly disassembled and replaced. At the same time, the blow molding head 6010 is made of high-temperature resistant plastic material, which can adapt to the high-temperature environment during the blow molding process, avoiding deformation or damage to the blow molding head 6010 due to high temperature, and ensuring stable blow molding operation.

[0025] Furthermore, a support airbag 6011 is fitted on the outer side of the blow molding head 6010. The support airbag 6011 is a ring-shaped structure made of elastic rubber material. It is fitted on the outer side of the blow molding head 6010. During the blow molding process, the support airbag 6011 can enter the plastic preform along with the blow molding head 6010. When blow molding begins, the support airbag 6011 can expand slightly under certain pressure and contact the inner wall of the preform, providing auxiliary support to the preform and limiting excessive or irregular deformation of the preform during the blow molding process. At the same time, the elastic rubber material has good flexibility and will not scratch the inner wall of the preform. It can also adapt to the shape changes during the preform molding process, ensuring that the final molded plastic bottle has accurate dimensions and a smooth appearance.

[0026] Working Principle: In operation, the process begins with mold preparation. The motor drives the lead screw structure, moving the moving block 2 inside the base 1. This causes the moving mold 3 on the upper end of the moving block 2 to move towards the fixed mold 4. As they approach docking, the positioning rod 5 inside the fixed mold 4 inserts into the positioning hole of the moving mold 3 for precise positioning, forming a closed blow molding cavity awaiting the preform. Next comes the blow molding assembly positioning stage. Based on the preform specifications, the drive cylinder 605 in the auxiliary support assembly 6 extends and retracts. The drive cylinder 605 drives the slide plate 603 to slide along the connecting rail 602 on the surface of the support plate 601. Simultaneously, the connecting plate 606 at the lower end of the slide plate 603 drives the fixed plate 607 to move until the four sets of blow molding guns 608 inside the fixed plate 607 are aligned with the opening of the preform in the mold cavity. Then, the blow molding stage begins. After the plastic preform is placed into the cavity formed by the moving mold 3 and the fixed mold 4, the working chamber 609 is activated. The working chamber 609 then supplies power to the four sets of blow molding guns through pipes. High-pressure gas is delivered via blow gun 608 and flows to blow head 6010 at the lower end. Blow head 6010 extends into the preform and blows the gas evenly onto support airbag 6011. Support airbag 6011 pushes the preform to conform to the inner wall of the mold and forms the preform. At the same time, support airbag 6011 on the outside of blow head 6010 expands slightly under pressure and contacts the inner wall of preform to provide auxiliary support to limit deformation. Finally, in the demolding and resetting stage, after the plastic bottle is formed, working chamber 609 stops delivering the medium, support airbag 6011 returns to its original shape, and control drive cylinder 605 to extend and retract, driving slide plate 603, connecting plate 606, fixing plate 607, blow gun 608, and blow head 6010 to withdraw from the mold cavity. Then, the motor drives the lead screw structure to move block 2 and moving mold 3 away from fixed mold 4, opening the mold and taking out the formed plastic bottle. Finally, moving mold 3 resets, ready for the next blow molding operation. This completes the process of using an auxiliary support structure to prevent deformation during the blow molding of plastic bottles.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary support structure for preventing deformation during the blow molding process of plastic bottles, comprising a base (1), characterized in that: A movable block (2) is provided on the inner side of the base (1). A movable mold (3) is fixedly connected to the upper end of the movable block (2). A fixed mold (4) is provided on the left side of the movable mold (3). A positioning rod (5) is installed on the inner surface of the fixed mold (4). An auxiliary support assembly (6) is provided on the left side of the fixed mold (4). The auxiliary support assembly (6) includes a support plate (601) installed on the left side of the fixed mold (4). A connecting slide rail (602) is fixedly connected to the surface of the support plate (601).

2. The auxiliary support structure for preventing deformation during the blow molding process of a plastic bottle according to claim 1, characterized in that, The inner side of the movable mold (3) is provided with a positioning hole that is compatible with the positioning rod (5). The end of the positioning rod (5) away from the fixed mold (4) can be inserted into the positioning hole of the movable mold (3). The movable block (2) and the base (1) are connected by a motor drive screw structure.

3. The auxiliary support structure for preventing deformation during the blow molding process of a plastic bottle according to claim 1, characterized in that, The inner side of the connecting slide rail (602) is slidably connected to a slide plate (603), and the inner side of the slide plate (603) is sleeved with a connecting rod (604). The upper end of the connecting rod (604) is fixedly connected to a driving cylinder (605), and the bottom end of the connecting rod (604) is welded to the base (1).

4. The auxiliary support structure for preventing deformation during the blow molding process of a plastic bottle according to claim 3, characterized in that, The lower end of the slide plate (603) is fixedly connected to a connecting plate (606), and the right side of the connecting plate (606) is fixedly connected to a fixing plate (607). The fixing plate (607) is a rectangular plate structure and is made of high-strength alloy material.

5. The auxiliary support structure for preventing deformation during the blow molding process of a plastic bottle according to claim 4, characterized in that, A blow molding gun (608) is installed on the inner side of the fixing plate (607). A working chamber (609) is provided on the left side of the blow molding gun (608). The working chamber (609) is connected to the blow molding gun (608) through a pipe. There are a total of four sets of blow molding guns (608).

6. The auxiliary support structure for preventing deformation during the blow molding process of a plastic bottle according to claim 5, characterized in that, The lower end of the blow molding gun (608) is equipped with a blow molding head (6010), which has a conical structure and is detachably connected to the blow molding gun (608) by a thread. The blow molding head (6010) is made of high-temperature resistant plastic material.

7. The auxiliary support structure for preventing deformation during the blow molding process of a plastic bottle according to claim 6, characterized in that, The outer side of the blow molding head (6010) is fitted with a support airbag (6011), which is a ring-shaped sac structure and is made of elastic rubber material.

Images