Multi-cavity injection mold for plastic bottle blanks

Abstract

The utility model relates to the technical field of plastic molding, and discloses a plastic bottle blank multi-cavity injection mold, which solves the problems in the background technology, comprises an upper mold and a lower mold, and is characterized in that a lower flow guide groove is arranged around the lower mold, positioning grooves are arranged at four corners of the lower mold, positioning holes are arranged in the positioning grooves, and the lower flow guide groove is communicated with the positioning holes. A supporting plate is installed below the lower mold, the supporting plate is connected with a supporting platform, a push rod is arranged below a model of the lower mold, a hydraulic table is connected below the push rod, and the push rod and the hydraulic table are both arranged on the supporting platform; an injection molding opening is formed in the upper portion of the upper mold, an upper flow guide groove is formed in the periphery of the upper mold, a positioning block is arranged on the upper mold, a positioning column is arranged on the positioning block, the positioning block can be embedded into the positioning groove, and the positioning column can be embedded into the positioning hole. According to the utility model, multi-cavity injection molding can be carried out, the production efficiency is improved, and quick demolding can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of plastic molding technology, specifically a multi-cavity injection mold for plastic preforms. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. Its advantages include high production speed and efficiency, automated operation, a wide variety of designs and shapes (from simple to complex), and large to small sizes. It also produces precise dimensions, facilitates product updates, and can create complex shapes. However, most current molding equipment uses a single-cavity structure, which is not conducive to rapid production. After injection molding, the product needs to be removed from the mold cavity, but because the product tends to adhere to the inner wall of the mold cavity, it is difficult to remove, making demolding inconvenient.

[0003] To address this, we propose a multi-cavity injection mold for plastic preforms. Utility Model Content

[0004] Most current molding devices use a single-cavity structure, which is not conducive to rapid production. After injection molding, the product needs to be ejected from the mold cavity. However, because the product easily adheres to the inner wall of the mold cavity, it is difficult to remove, making demolding inconvenient. To solve the above problems, this utility model provides the following technical solution: a multi-cavity injection mold for plastic preforms, including an upper mold and a lower mold, characterized in that: a lower guide groove is provided around the lower mold; positioning grooves are provided at the four corners of the lower mold; positioning holes are provided in the positioning grooves; a support plate is installed below the lower mold; a support platform is connected to the support plate; a push rod is provided below the lower mold; a hydraulic platform is connected below the push rod; both the push rod and the hydraulic platform are located on the support platform; an injection port is provided above the upper mold; an upper guide groove is provided around the upper mold; a positioning block is provided on the upper mold; a positioning post is provided on the positioning block; the positioning block can be fitted with the positioning groove; and the positioning post can be fitted into the positioning hole.

[0005] Preferably, the hydraulic platform is slightly smaller than the support platform, and the hydraulic platform can move up and down along the support plate.

[0006] Preferably, the positioning hole extends into the support plate, and the support plate is screwed onto the support platform.

[0007] Preferably, a square groove is provided above the model of the lower mold, and a through hole is provided below the square groove. The push rod is a T-shaped rod, and the diameter of the push rod body is smaller than the diameter of the through hole, allowing the push rod to move up and down in the through hole. The volume of the push rod head is smaller than the volume of the square groove, allowing the push rod head to engage in the square groove of the model. After injection molding, pushing the push rod upwards allows the molded plastic to be quickly removed from the lower mold.

[0008] Preferably, both the upper mold and the lower mold are made of tungsten cobalt powder alloy tool steel, which has good high temperature resistance and corrosion resistance.

[0009] Preferably, a protruding flow-limiting platform is provided around the injection port to prevent material overflow during the injection process.

[0010] Preferably, the positioning post is screwed to the upper mold for a more secure connection.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] During operation, the upper and lower molds are engaged, with the positioning pins confined within the positioning holes, which in turn are confined within the positioning grooves. The rising hydraulic platform ensures the push rod is precisely fitted into the lower mold, eliminating any opening in the upper mold. Material is then injected from the upper mold, forming between the upper and lower molds. After cooling, the upper and lower molds are separated, and the plastic is molded. If the molded plastic is difficult to remove from the lower mold, the rising hydraulic platform can push the push rod upwards, allowing for quick removal of the molded plastic. This invention enables multi-cavity injection molding, improving production efficiency and facilitating rapid demolding. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a three-dimensional structural diagram of the lower mold of this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the upper mold of this utility model;

[0016] Figure 3 This is a side view of the lower mold of this utility model;

[0017] Figure 4 This is a top view of the upper mold of this utility model;

[0018] Figure 5 This is a cross-sectional schematic diagram of the model and push rod part of this utility model;

[0019] In the diagram: 1. Lower mold; 2. Lower guide channel; 3. Positioning groove; 4. Positioning hole; 5. Support plate; 6. Support platform; 7. Push rod; 8. Hydraulic table; 9. Upper mold; 10. Positioning block; 11. Positioning post; 12. Upper guide channel; 13. Injection port; 14. Flow limiting table; 15. Model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Depend on Figure 1-2 The present invention includes a lower mold 1 and an upper mold 9. The lower mold 1 is characterized by having a lower guide groove 2 around its perimeter, positioning grooves 3 at its four corners, positioning holes 4 within the positioning grooves 3, a support plate 5 mounted below the lower mold 1, a support platform 6 connected to the support plate 5, a push rod 7 below the model 15 of the lower mold 1, a hydraulic platform 8 connected below the push rod 7, and both the push rod 7 and the hydraulic platform 8 being mounted on the support platform 6.

[0022] An injection port 13 is provided above the upper mold 9, an upper guide groove 12 is provided around the upper mold 9, a positioning block 10 is provided on the upper mold 9, a positioning post 11 is provided on the positioning block 10, the positioning block 10 can be fitted with the positioning groove 3, and the positioning post 11 can be fitted into the positioning hole 4.

[0023] The hydraulic platform 8 is slightly smaller than the support platform 6, and the hydraulic platform 8 can move up and down along the support plate 5.

[0024] The positioning hole 4 extends into the support plate 5, which is screwed onto the support platform 6.

[0025] A square groove is provided above the model 15 of the lower mold 1, and a through hole is provided below the square groove. The push rod 7 is a T-shaped rod, and the diameter of the push rod 7 is smaller than the diameter of the through hole, allowing the push rod 7 to move up and down in the through hole. The volume of the head of the push rod 7 is smaller than the volume of the square groove, allowing the head of the push rod 7 to engage in the square groove of the model 15. After injection from the injection port 13, the material fills the upper mold 9 and lower mold 1 along the lower guide groove 2 and the upper guide groove 12. The head of the push rod 7 effectively prevents the material from seeping into the interior of the model 15. After the plastic is molded, the upper mold 9 and lower mold 1 are separated, and the push rod 7 is pushed upward to quickly remove the molded plastic from the lower mold 1. The head of the push rod 7 increases the contact area with the interior of the molded plastic, protecting the plastic from damage during demolding.

[0026] Both the upper mold 9 and the lower mold 1 are made of tungsten cobalt powder alloy tool steel, which has good high temperature resistance and corrosion resistance.

[0027] A protruding flow-limiting platform 14 is provided around the injection port 13 to prevent material from overflowing during the injection process.

[0028] The positioning pin 11 is screwed to the upper mold 9, making it more secure.

[0029] Working principle: During operation, the upper mold 9 and lower mold 1 are engaged. The positioning pin 11 is confined in the positioning hole 4, and the positioning block 10 is confined in the positioning groove 3. The rising hydraulic platform 8 causes the push rod 7 to fit precisely into the lower mold 1, ensuring that the lower mold 1 has no opening. Material is injected from the injection port 13 of the upper mold 9, and distributed into multiple cavities through the upper guide groove 12 and lower guide groove 2. The material is formed between the upper mold 9 and the lower mold 1. After cooling, the upper mold 9 and lower mold 1 are separated, and the plastic is molded. The molded plastic is difficult to remove from the lower mold 1; the rising hydraulic platform 8 pushes the push rod 7 upwards, allowing the molded plastic to be quickly removed.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] 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. A multi-cavity injection mold for plastic preforms, comprising a lower mold (1) and an upper mold (9), characterized in that, The lower mold (1) is surrounded by a lower guide groove (2), and the lower mold (1) is provided with positioning grooves (3) at its four corners. The positioning grooves (3) are provided with positioning holes (4). A support plate (5) is installed below the lower mold (1). The support plate (5) is connected to a support platform (6). A push rod (7) is provided below the model (15) of the lower mold (1). A hydraulic table (8) is connected below the push rod (7). The push rod (7) and the hydraulic table (8) are both located on the support platform (6). An injection port (13) is provided above the upper mold (9), an upper guide groove (12) is provided around the upper mold (9), a positioning block (10) is provided on the upper mold (9), a positioning post (11) is provided on the positioning block (10), the positioning block (10) can be fitted with the positioning groove (3), and the positioning post (11) can be fitted into the positioning hole (4).

2. The multi-cavity injection mold for plastic preforms according to claim 1, characterized in that: The hydraulic platform (8) is slightly smaller than the support platform (6), and the hydraulic platform (8) can move up and down along the support plate (5).

3. The multi-cavity injection mold for plastic preforms according to claim 1 or 2, characterized in that: The positioning hole (4) extends into the support plate (5), which is screwed onto the support platform (6).

4. The multi-cavity injection mold for plastic preforms according to claim 1, characterized in that: A square groove is provided above the model (15) of the lower mold (1), and a through hole is provided below the square groove. The push rod (7) is a T-shaped rod. The diameter of the push rod (7) is smaller than the diameter of the through hole, so that the push rod (7) can move up and down in the through hole. The volume of the head of the push rod (7) is smaller than the volume of the square groove, so that the head of the push rod (7) can be engaged in the square groove of the model (15).

5. The multi-cavity injection mold for plastic preforms according to claim 1, characterized in that: Both the upper mold (9) and the lower mold (1) are made of tungsten cobalt powder alloy tool steel, which has good high temperature resistance and corrosion resistance.

6. The multi-cavity injection mold for plastic preforms according to claim 1, characterized in that: A protruding flow-limiting platform (14) is provided around the injection port (13) to prevent material from overflowing during the injection process.

7. The multi-cavity injection mold for plastic preforms according to claim 1, characterized in that: The positioning pin (11) is screwed to the upper mold (9).

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