PET (Polyethylene Terephthalate) plastic cup preform injection mold

Abstract

The utility model relates to the technical field of PET (Polyethylene Terephthalate) plastic cup preform injection molding, and discloses a PET plastic cup preform injection mold which comprises a mounting plate, a quick demolding mechanism is arranged at the top of the mounting plate, an upper mold is arranged at the top of the quick demolding mechanism, an injection molding mechanism is arranged at the top of the upper mold, the quick demolding mechanism comprises a lower mold, and the lower mold is provided with an upper mold. The lower dies are arranged at the top of the mounting plate, first air cylinders are fixedly connected to the two sides of each lower die, and fixing parts are fixedly connected to the sides, away from the lower dies, of the first air cylinders and fixedly connected to the top of the mounting plate. According to the PET plastic cup preform injection mold, through the arrangement of the rapid demolding mechanism, compared with a traditional demolding method, the machining period of each plastic cup preform is greatly shortened through the efficient disassembly mode, and the efficiency of a whole plastic cup preform machining production line is improved; and therefore, more qualified plastic cup bottle blanks can be produced in unit time, and the large demand of the market on the plastic cup bottle blanks is met.

Description

Technical Field

[0001] This utility model relates to the field of PET plastic cup and bottle preform injection molding technology, specifically to a PET plastic cup and bottle preform injection mold. Background Technology

[0002] PET plastic cup and bottle preforms are an important intermediate product in the manufacture of PET plastic cups and bottles. PET (polyethylene terephthalate) is a thermoplastic polyester. It has good chemical stability and is resistant to most organic solvents and acids and alkalis. This makes PET plastic cup and bottle preforms less susceptible to corrosion from common chemicals during storage and subsequent processing, ensuring the stability of product quality.

[0003] In the current plastics processing field, existing PET plastic cup and bottle preform injection molds have significant limitations in practical applications. After PET plastic granules are heated, melted, and injection molded into the cup and bottle preform within the mold cavity—a series of complex processes—demolding often requires manual intervention, following traditional operating methods.

[0004] In this demolding process, workers need to open the mold first and then carefully remove the formed PET plastic cup and bottle preforms from the mold. However, this manual demolding method has many drawbacks. First, from the perspective of time cost, since manual operation is relatively slow, especially in the case of large-scale production, each cup and bottle preform takes a certain amount of time to demold, which results in the entire demolding process consuming a lot of time, seriously affecting production efficiency and making it impossible to effectively increase the output per unit time. Utility Model Content

[0005] The purpose of this invention is to provide an injection mold for PET plastic cup and bottle preforms to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a PET plastic cup and bottle preform injection mold, including a mounting plate, a quick demolding mechanism on the top of the mounting plate, an upper mold on the top of the quick demolding mechanism, and an injection molding mechanism on the top of the upper mold.

[0007] The rapid demolding mechanism includes a lower mold, which is disposed on the top of the mounting plate. A first cylinder is fixedly connected to both sides of the lower mold. A fixing member is fixedly connected to the side of the first cylinder away from the lower mold. The fixing member is fixedly connected to the top of the mounting plate. A connecting block is fixedly connected to both sides of the surface of the lower mold. A support rod is slidably connected inside the connecting block. A second fixing member is fixedly connected to both sides of the support rod. The second fixing member is fixedly connected to the top of the mounting plate.

[0008] Preferably, there are two lower molds, which are symmetrically arranged, and an injection groove is provided between the two lower molds. The injection groove is cylindrical. By designing the injection groove as a circle, the appearance requirements of the PET plastic cup and bottle preform can be met.

[0009] Preferably, a cooling plate is fixedly connected to the surface of the lower mold, and the cooling plate is in close contact with the lower mold. The cooling plate can accelerate the cooling of the PET plastic cup and bottle preform.

[0010] Preferably, the number of injection molding grooves is three, and the three injection molding grooves are distributed at equal intervals.

[0011] Preferably, the injection molding mechanism includes a fixed plate, which is fixedly connected to the top of the upper mold. Placement frames are fixedly connected to both sides of the fixed plate. A fixed frame is fixedly connected to the top of the placement frame. A second cylinder is fixedly connected to the bottom of the fixed frame. The second cylinder is fixedly connected to the top of the mounting plate. The second cylinder can drive the upper mold to move downward, at which time the upper mold is inserted into the injection groove.

[0012] Preferably, a vertical rod is slidably connected inside the placement frame. The vertical rod is fixedly connected to the top of the mounting plate, and a limiting component is fixedly connected to the top of the vertical rod. The limiting component is located at the top of the placement frame. When the upper mold moves downward, the placement frame slides downward on the surface of the vertical rod.

[0013] Preferably, a spring is sleeved on the surface of the vertical rod. The spring is located at the bottom of the placement frame. The spring provides a buffering force to the upper mold, preventing the upper mold from directly impacting the inside of the injection molded groove and causing damage to the injection molded groove and the upper mold, thus playing a protective role.

[0014] Compared with the prior art, this utility model provides a PET plastic cup and bottle preform injection mold, which has the following beneficial effects:

[0015] 1. This PET plastic cup and bottle preform injection mold, through its set-up rapid demolding mechanism, has a highly efficient disassembly method that greatly shortens the processing cycle of each plastic cup and bottle preform compared to traditional demolding methods, improves the efficiency of the entire plastic cup and bottle preform processing production line, and thus can produce more qualified plastic cup and bottle preforms per unit time, meeting the large market demand for plastic cup and bottle preforms.

[0016] 2. This PET plastic cup and bottle preform injection mold, through the injection mechanism, allows the second cylinder to drive the upper mold to move downwards. At this time, the upper mold is inserted into the injection groove. After cooling for a period of time, it can achieve the purpose of injection molding the plastic cup and bottle preform. During the downward movement of the upper mold, the support slides down the surface of the vertical rod and compresses the spring, which can provide a buffer force for the upper mold, preventing the upper mold from directly impacting the inside of the injection groove and causing damage to the injection groove and the upper mold, thus playing a protective role. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the rapid demolding mechanism of this utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of the rapid demolding mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of the injection molding mechanism of this utility model;

[0022] Figure 5 This is a schematic diagram of part of the injection molding mechanism of this utility model.

[0023] In the diagram: 1. Mounting plate; 2. Quick demolding mechanism; 21. Fixing component; 22. Lower mold; 23. Support rod; 24. First cylinder; 25. Connecting block; 26. Cooling plate; 27. Injection tank; 28. Second fixing component; 3. Injection mechanism; 31. Placement frame; 32. Spring; 33. Fixing plate; 34. Fixing frame; 35. Limiting component; 36. Vertical rod; 37. Second cylinder; 4. Upper mold. Detailed Implementation

[0024] 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.

[0025] This utility model provides a technical solution:

[0026] Example 1:

[0027] Combination Figures 1 to 2 -3, a PET plastic cup and bottle preform injection mold, including a mounting plate 1, a quick demolding mechanism 2 is provided on the top of the mounting plate 1, an upper mold 4 is provided on the top of the quick demolding mechanism 2, and an injection molding mechanism 3 is provided on the top of the upper mold 4.

[0028] The quick demolding mechanism 2 includes a lower mold 22, which is located on the top of the mounting plate 1. A first cylinder 24 is fixedly connected to both sides of the lower mold 22. A fixing member 21 is fixedly connected to the side of the first cylinder 24 away from the lower mold 22. The fixing member 21 is fixedly connected to the top of the mounting plate 1. A connecting block 25 is fixedly connected to both sides of the surface of the lower mold 22. A support rod 23 is slidably connected inside the connecting block 25. A second fixing member 28 is fixedly connected to both sides of the support rod 23. The second fixing member 28 is fixedly connected to the top of the mounting plate 1.

[0029] Furthermore, there are two lower molds 22, which are symmetrically arranged. An injection groove 27 is provided between the two lower molds 22. The injection groove 27 is cylindrical. By designing the injection groove 27 as a circle, the appearance requirements of the PET plastic cup and bottle preform can be met.

[0030] Furthermore, a cooling plate 26 is fixedly connected to the surface of the lower mold 22. The cooling plate 26 is in close contact with the lower mold 22. The cooling plate 26 can accelerate the cooling of the PET plastic cup and bottle preform.

[0031] Furthermore, the number of injection molding grooves 27 is three, and the three injection molding grooves 27 are distributed at equal intervals.

[0032] Example 2:

[0033] See Figure 4-5 Furthermore, based on Embodiment 1, the injection molding mechanism 3 further includes a fixing plate 33, which is fixedly connected to the top of the upper mold 4. Placement racks 31 are fixedly connected to both sides of the surface of the fixing plate 33. A fixing rack 34 is fixedly connected to the top of the placement rack 31. A second cylinder 37 is fixedly connected to the bottom of the fixing rack 34. The second cylinder 37 is fixedly connected to the top of the mounting plate 1. The second cylinder 37 can drive the upper mold 4 to move downward, at which time the upper mold 4 is inserted into the interior of the injection groove 27.

[0034] Furthermore, a vertical rod 36 is slidably connected inside the placement frame 31. The vertical rod 36 is fixedly connected to the top of the mounting plate 1. A limiting member 35 is fixedly connected to the top of the vertical rod 36. The limiting member 35 is set on the top of the placement frame 31. When the upper mold 4 moves downward, the placement frame 31 slides downward on the surface of the vertical rod 36.

[0035] Furthermore, a spring 32 is sleeved on the surface of the vertical rod 36. The spring 32 is located at the bottom of the placement frame 31. The spring 32 provides a buffer force to the upper mold 4, preventing the upper mold 4 from directly impacting the inside of the injection groove 27 and causing damage to the injection groove 27 and the upper mold 4, thus playing a protective role.

[0036] In actual operation, when this device is used, the injection molding material is first placed into the injection tank 27. Then, the second cylinder 37 is activated, which drives the upper mold 4 to move downward. At this time, the upper mold 4 is inserted into the injection tank 27. After cooling for a period of time, the plastic cup and bottle preform can be injection molded. When the upper mold 4 moves downward, the placement frame 31 slides down on the surface of the vertical rod 36 and compresses the spring 32, which can provide a buffer force for the upper mold 4 and prevent the upper mold 4 from directly hitting the inside of the injection tank 27, thus preventing damage to the injection tank 27 and the upper mold 4 and playing a protective role.

[0037] After the plastic cup / bottle preform has undergone the crucial process of cooling and injection molding in the injection molding machine, it enters the demolding stage. At this time, the first cylinder 24, located on both sides of the mold, can be activated. As a power drive device, the first cylinder 24 will quickly generate a strong thrust upon receiving the start signal. This thrust acts on the two lower molds 22 connected to it, pushing the lower molds 22 to move along a specific track in opposite directions. This movement can effectively break the connection between the lower molds 22 and the plastic cup / bottle preform. Since there may be a certain amount of adsorption or friction between the plastic cup / bottle preform and the mold during the injection molding process, this movement of the lower molds 22 separating to both sides can cleverly overcome these resistances, thereby achieving rapid and non-destructive disassembly of the internal plastic cup / bottle preform. Compared with traditional demolding methods, this efficient disassembly method greatly shortens the processing cycle of each plastic cup / bottle preform, improves the efficiency of the entire plastic cup / bottle preform processing production line, and can produce more qualified plastic cup / bottle preforms per unit time, meeting the large market demand for plastic cup / bottle preforms.

[0038] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A PET plastic cup / bottle preform injection mold, comprising a mounting plate (1), characterized in that: The mounting plate (1) is provided with a quick demolding mechanism (2) at the top, the quick demolding mechanism (2) is provided with an upper mold (4) at the top, and the upper mold (4) is provided with an injection molding mechanism (3) at the top; The quick demolding mechanism (2) includes a lower mold (22), which is located on the top of the mounting plate (1). A first cylinder (24) is fixedly connected to both sides of the lower mold (22). A fixing member (21) is fixedly connected to the side of the first cylinder (24) away from the lower mold (22). The fixing member (21) is fixedly connected to the top of the mounting plate (1). A connecting block (25) is fixedly connected to both sides of the surface of the lower mold (22). A support rod (23) is slidably connected inside the connecting block (25). A second fixing member (28) is fixedly connected to both sides of the support rod (23). The second fixing member (28) is fixedly connected to the top of the mounting plate (1).

2. The injection mold for PET plastic cup / bottle preforms according to claim 1, characterized in that: The number of lower molds (22) is two, the two lower molds (22) are arranged symmetrically, and an injection groove (27) is opened between the two lower molds (22). The injection groove (27) is cylindrical.

3. The injection mold for PET plastic cup and bottle preforms according to claim 1, characterized in that: A cooling plate (26) is fixedly connected to the surface of the lower mold (22), and the cooling plate (26) is in close contact with the lower mold (22).

4. The injection mold for PET plastic cup and bottle preforms according to claim 2, characterized in that: The number of injection grooves (27) is three, and the three injection grooves (27) are distributed at equal intervals.

5. The injection mold for PET plastic cup and bottle preforms according to claim 1, characterized in that: The injection molding mechanism (3) includes a fixing plate (33), which is fixedly connected to the top of the upper mold (4). Placement racks (31) are fixedly connected to both sides of the surface of the fixing plate (33). A fixing rack (34) is fixedly connected to the top of the placement rack (31). A second cylinder (37) is fixedly connected to the bottom of the fixing rack (34). The second cylinder (37) is fixedly connected to the top of the mounting plate (1).

6. The injection mold for PET plastic cup and bottle preforms according to claim 5, characterized in that: A vertical rod (36) is slidably connected inside the placement rack (31). The vertical rod (36) is fixedly connected to the top of the mounting plate (1). A limiting member (35) is fixedly connected to the top of the vertical rod (36). The limiting member (35) is located on the top of the placement rack (31).

7. The injection mold for PET plastic cup / bottle preforms according to claim 6, characterized in that: A spring (32) is sleeved on the surface of the vertical rod (36), and the spring (32) is located at the bottom of the placement frame (31).

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