Plastic preform injection molding equipment

Abstract

The present invention belongs to the injection production technology field, and discloses a plastic bottle embryo injection molding device, the injection molding device includes a molding mechanism, the molding mechanism includes a fixed mold seat and a movable mold seat; a bottle body module is arranged on the fixed mold seat, a bottle core module and a bottle mouth module are arranged on the movable mold seat; the bottle mouth module contains a thread structure. The separate design of the bottle mouth module and the bottle core module of the injection molding device significantly reduces the demoulding resistance and improves the success rate and efficiency of demoulding; at the same time, the molding of the bottle mouth thread structure is transferred from the bottle body module to the independent bottle mouth module, which not only reduces the wear rate of the bottle body module and prolongs its service life, but also greatly reduces the replacement cost after the thread is worn, because only the bottle mouth module needs to be replaced.

Description

Technical Field

[0001] The invention belongs to the technical field of injection production and relates to a plastic bottle embryo injection molding device. Background Art

[0002] As an intermediate in the manufacturing process of plastic bottles, the production of preforms mainly depends on injection molding equipment; however, the existing plastic preforms have the following problems in the actual production process using injection molding equipment:

[0003] During the preform molding stage, the thin-walled nature of the preform itself brings considerable difficulties to the demoulding process; in addition, in order to ensure a good seal between the bottle cap and the bottle body, the thread structure of the bottle mouth will be integrated into the preform when it is initially molded, that is, directly formed during the injection process. Although this method can effectively improve the sealing effect, it also further exacerbates the demoulding problem. When the preform is completed and needs to be removed from the mold, its thread structure often has a strong bite with the corresponding thread on the mold, making the demoulding process extremely difficult. In cases where the thread design is particularly complex, deep, or requires extremely high precision, this strong bite may cause the preform to crack or deform, which will seriously affect the quality and performance of the finished product.

[0004] Secondly, the special nature of the thread structure causes the thread molding area in the mold to wear much faster than other parts. Frequent wear forces the mold to be regularly maintained or replaced, especially in the thread molding area. This not only increases production downtime, but also significantly increases the maintenance and replacement costs of the mold, which has an adverse impact on the overall economic efficiency of plastic preform injection molding equipment.

[0005] In summary, it is found that the prior art has at least the following technical problems:

[0006] Existing plastic preform injection molding equipment has problems such as difficulty in demoulding and high mold replacement costs. Summary of the invention

[0007] In view of this, an object of the present invention is to provide a plastic preform injection molding device to solve the problems existing in the above-mentioned background technology.

[0008] In order to solve the above technical problems, the technical solution of the present invention is a plastic bottle preform injection molding device, the injection molding device includes a workbench, and a molding mechanism arranged on the workbench, the molding mechanism includes a fixed mold seat and a movable mold seat; a bottle body module is arranged on the fixed mold seat, and a bottle core module and a bottle mouth module are arranged on the movable mold seat; the bottle body module, the bottle core module and the bottle mouth module are arranged on the same center line, and the bottle body module and the bottle mouth module are matched to form an outer module of the bottle preform; the bottle mouth module contains a thread structure; when the bottle preform needs to be demolded, the fixed mold seat and the movable mold seat move away from each other, and the thread structure can make the bottle preform follow the movable mold seat to move, so that the bottle preform is separated from the bottle body module; the bottle core module is movably arranged on the movable mold seat; when the bottle preform is separated from the bottle body module, the bottle core module rotates and moves toward the fixed mold seat, so that the bottle preform is separated from the bottle mouth module.

[0009] Preferably, a connecting port is provided on the movable mold seat, and the bottle core module passes through both sides of the movable mold seat from the connecting port; a limiting groove is provided on the outer wall at the end of the bottle core module, and at least a part of the limiting groove is spirally arranged; the inner wall of the connecting port has a limiting protrusion, and the limiting protrusion is located in the limiting groove; the bottle core module is pushed to move toward the fixed mold seat, and under the action of the spiral part of the limiting groove and the limiting protrusion, the bottle core module rotates and moves toward the fixed mold seat.

[0010] Furthermore, an ejection mechanism is provided at the front end of the bottle core module; when the preform is separated from the bottle mouth module, the ejection mechanism allows the preform to be ejected from the bottle core module, thereby realizing automatic unloading of the preform after injection molding.

[0011] Furthermore, the bottle core module includes a core body and a control block arranged at the end of the core body, a push rod is provided at the front end of the core body, a transmission block is provided at the front end of the control block, and a transmission channel is provided in the core body and the control block; the push rod and the control block are located at both ends of the transmission channel, and the transmission channel forms a sealed space, and the sealed space is filled with liquid, so as to control the movement of the push rod and the control block; the bottle core module is pushed to move toward the fixed mold seat, and the control block will approach the movable mold seat. When the transmission block contacts the movable mold seat; the bottle core module is continued to be pushed to move the transmission block in the opposite direction, so that the push rod moves forward to push the preform off the bottle core module.

[0012] Furthermore, the molding mechanism also includes a mounting plate, on which is provided a driving component for controlling the movement of the movable mold seat; when the driving component controls the movable mold seat to retract, the bottle core module moves with the movable mold seat; behind the control block and the mounting plate, as the movable mold seat moves, the bottle core module can be pushed.

[0013] Furthermore, a first spring is provided between the control block and the movable mold seat, and a second spring is provided between the control block and the transmission block; after the blanking of the bottle embryo is completed, the movable mold seat approaches the fixed mold seat, and under the action of the first spring and the second spring, the bottle core module is automatically reset.

[0014] Furthermore, a limiting component is also provided on the movable mold base, and the limiting component is used to constrain the movable space of the control block; when the injection molding equipment performs injection molding of the preform, the position of the control block is constrained to ensure the accurate position of the bottle core module.

[0015] Furthermore, the limit assembly includes a connecting rod slidably arranged on the movable mold base, the connecting rod connects the two sides of the movable mold base, one end of the connecting rod is provided with a clamping block, the other end of the connecting rod is provided with a limit plate, and the limit plate is located on the back of the control block.

[0016] Furthermore, an annular groove is provided on the control block; the limit assembly includes a connecting rod slidably arranged on the movable mold base, and the connecting rod connects the two sides of the movable mold base; a clamping block is provided at one end of the connecting rod, and the other end of the connecting rod is limited and constrained in the annular groove, and the connecting rod can move in the annular groove.

[0017] Preferably, the injection molding equipment further comprises an injection mechanism disposed on the workbench; the injection mechanism comprises an injection cylinder, a screw rod disposed in the injection cylinder, a discharge hopper disposed on the injection cylinder, and a motor for driving the screw rod to rotate.

[0018] The technical effects of the present invention are mainly reflected in the following aspects:

[0019] The separate design of the bottle mouth module and the bottle core module of the injection molding equipment significantly reduces the demoulding resistance and improves the success rate and efficiency of demoulding; at the same time, the molding of the bottle mouth thread structure is transferred from the bottle body module to the independent bottle mouth module, which not only reduces the wear rate of the bottle body module and extends its service life, but also greatly reduces the replacement cost after the thread is worn, because only the bottle mouth module needs to be replaced.

[0020] The introduced hydraulic oil not only serves as the power source of the ejection mechanism, but also transmits pressure through the hydraulic oil to automatically trigger the ejection mechanism by moving the bottle core module, realizing automatic unloading of the formed bottle embryo, improving production efficiency; it also plays a role in balancing the core temperature, ensuring temperature control during the molding process, and thus improving the molding accuracy and consistency of the bottle embryo. The rapid reset mechanism of the bottle core module greatly shortens the time of a single molding cycle and improves the throughput and overall production efficiency of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the present invention;

[0022] Figure 2 for Figure 1 Structural diagram of the intermediate molding mechanism;

[0023] Figure 3 for Figure 2 Structural diagram of the middle movable mold base;

[0024] Figure 4 for Figure 2 Side view of the middle movable mold base;

[0025] Figure 5 for Figure 2 Cross-sectional view of the middle movable mold base;

[0026] Figure 6 for Figure 5 A magnified view of part A in FIG.

[0027] Figure 7 for Figure 1 Structural diagram of the injection mechanism;

[0028] In the figure: 1. workbench; 2. molding mechanism, 21. fixed mold seat, 22. movable mold seat; 31. bottle body module, 32. bottle core module, 33. bottle mouth module; 41. connecting port, 42. limiting groove, 43. limiting protrusion, 44. core body, 45. control block, 46. ejector rod, 47. transmission block, 48. transmission channel, 50. first spring, 52. connecting rod, 53. clamping block, 54. limiting plate; 6. injection mechanism, 61. injection cylinder, 62. discharge hopper, 63. motor. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0030] In this embodiment, it should be understood that the terms "middle", "upper", "lower", "top", "right", "left end", "above", "back", "middle", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, in this specific embodiment, if the connection or fixing method between components is not specifically described, the connection or fixing method can be through bolt fixing or pin fixing, or pin shaft connection and the like commonly used in the prior art, and therefore, it will not be described in detail in this embodiment.

[0032] Embodiment 1

[0033] See also Figure 1 , 2 7. Plastic preform injection molding equipment, the injection molding equipment includes a workbench 1, and a molding mechanism 2 arranged on the workbench 1, the molding mechanism 2 includes a fixed mold base 21 and a movable mold base 22; the injection molding equipment also includes an injection mechanism 6 arranged on the workbench 1; the injection mechanism 6 includes an injection cylinder 61, a screw rod arranged in the injection cylinder 61, a discharge hopper 62 arranged on the injection cylinder 61, and a motor 63 for driving the screw rod to rotate. The above is a conventional setting in a traditional injection molding equipment, and no further description is given here.

[0034] See also Figure 2 , the fixed mold seat 21 is provided with a bottle body module 31, and the movable mold seat 22 is provided with a bottle core module 32 and a bottle mouth module 33; the bottle body module 31, the bottle core module 32 and the bottle mouth module 33 are arranged on the same center line, and the bottle body module 31 and the bottle mouth module 33 match to form the outer module of the preform. In the traditional preform injection molding process, the mold is usually composed of a bottle body module 31 and a bottle core module 32, wherein the bottle body module 31 is not only responsible for forming the bottle body, but also includes the molding of the bottle mouth and its thread structure; this will increase the difficulty of demoulding, and as the thread structure of the bottle mouth wears, the bottle body module 31 needs to be replaced, which undoubtedly increases the module replacement cost of the equipment. The bottle mouth module 33 is designed as an independent module, which is convenient for quick replacement and maintenance. Because the thread structure is formed on the bottle mouth module 33, the wear of the bottle body module 31 is greatly reduced, its service life is extended, and the frequency and cost of mold replacement are reduced. After the threads are worn, only the bottle mouth module 33 needs to be replaced without replacing the entire bottle body module 31, which can significantly reduce the mold replacement cost and production downtime.

[0035] The mouth mold 33 has a thread structure, which means that the thread is formed on the mouth mold 33 instead of the body mold 31. During demoulding, the mouth mold 33 moves with the movable mold seat 22, while the body mold 31 remains on the fixed mold seat 21. When the preform is to be demoulded, the fixed mold seat 21 and the movable mold seat 22 move away from each other. At this time, the thread structure on the mouth mold 33 fixes the preform and moves with the movable mold seat 22, so that it can be easily separated from the body mold 31.

[0036] The core module 32 is movably arranged on the movable mold seat 22, and can rotate and move toward the fixed mold seat 21; when the preform is separated from the body module 31, the core module 32 rotates and moves toward the fixed mold seat 21, so that the preform is separated from the mouth module 33. The rotation of the core module 32 can destroy the contact between the preform and the mouth module 33, reduce friction, and further assist the demoulding process. Subsequently, the movement of the core module 32 toward the fixed mold seat 21 helps the preform to completely separate from the mouth module 33.

[0037] See also Figure 5 , 6 The movable mold base 22 is provided with a connecting port 41, and the bottle core module 32 passes through both sides of the movable mold base 22 from the connecting port 41, so that the bottle core module 32 can move freely between the two sides of the movable mold base 22; a limiting groove 42 is provided on the outer wall of the end of the bottle core module 32, and at least a part of the limiting groove 42 is spirally arranged; the inner wall of the connecting port 41 is provided with a limiting protrusion 43, and the limiting protrusion 43 is located in the limiting groove 42; the bottle core module 32 is pushed to move toward the fixed mold base 21, and under the action of the spiral part of the limiting groove 42 and the limiting protrusion 43, the bottle core module 32 is rotated and moved toward the fixed mold base 21. The coordinated design of the spiral groove and the limiting protrusion 43 ensures the precise control of the rotation angle and movement distance of the bottle core module 32, which helps to achieve a stable and repeatable demoulding action; compared with other solutions that may require an additional drive device (such as a motor 63) to achieve rotation, this design uses a simple mechanical structure to achieve the rotation function of the bottle core module 32, simplifies the equipment structure, and reduces costs.

[0038] Specifically, when demolding is required, the operator or the automated system pushes the bottle core module 32 to move toward the fixed mold base 21. During this process, the limiting protrusion 43 slides along the spiral portion in the limiting groove 42. Due to the existence of the spiral groove, the bottle core module 32 is forced to rotate while moving forward. The rotation of the bottle core module 32 can effectively break the contact between the preform and the bottle mouth module 33, reduce the friction during demolding, and make it easier for the preform to be detached from the bottle mouth module 33.

[0039] See also Figure 5 , 6 The front end of the bottle core module 32 is provided with an ejection mechanism; when the preform is separated from the bottle mouth module 33, the ejection mechanism allows the preform to be ejected from the bottle core module 32, thereby realizing automatic unloading of the preform after injection molding.

[0040] The bottle core module 32 includes a core body 44 for forming the inner surface of the preform during the molding process and a control block 45 arranged at the end of the core body 44. The front end of the core body 44 is provided with a push rod 46 for ejecting the preform after molding. The ejection mechanism is integrated by using the space of the bottle core module 32 itself, reducing the overall size and complexity of the equipment. The front end of the control block 45 is provided with a transmission block 47. The core body 44 and the control block 45 are provided with a transmission channel 48. The push rod 46 and the control block 45 are located at both ends of the transmission channel 48, and the transmission channel 48 forms a sealed space. The sealed space is filled with liquid and the pressure is transmitted by hydraulic oil. Thus, the movement of the push rod 46 and the control block 45 is controlled. Hydraulic transmission can provide a smooth and controllable ejection force to avoid damage to the preform.

[0041] The core module 32 is pushed to move toward the fixed mold base 21, and the control block 45 is moved toward the movable mold base 22. When the transmission block 47 contacts the movable mold base 22, the core module 32 is pushed further to move the transmission block 47 in the opposite direction, so that the ejector rod 46 moves forward to eject the preform from the core module 32. The ejection mechanism is automatically triggered by the movement of the core module 32 to realize automatic unloading of the preform after molding, thereby improving production efficiency.

[0042] Specifically, after the preform is formed, the ejector pin 46 is in a retracted state, and the preform is tightly attached to the core module 32. During the demolding process, the core module 32 is pushed to move toward the fixed mold seat 21. When the transmission block 47 at the front end of the control block 45 contacts the movable mold seat 22, continuing to push the core module 32 will force the transmission block 47 to move in the opposite direction. The movement of the transmission block 47 causes the liquid in the sealed space to be pressurized. Since the liquid is incompressible, the pressure will be transmitted to the end of the ejector pin 46 along the transmission channel 48, prompting the ejector pin 46 to extend forward. The ejector pin 46 extends to push the preform off the core module 32, completing the automatic unloading process of the preform.

[0043] By means of the pressure transmitted by the liquid, the extension distance of the ejector pin 46 can be much greater than the displacement directly acting on the control block 45 through the lever effect and the hydraulic amplification principle; when the end surface area of ​​the ejector pin 46 is larger than the end surface area of ​​the control block 45, according to Pascal's law and the principle of force balance, the same pressure acting on different areas will produce different forces, thereby achieving force amplification; under the action of the amplified force, the ejector pin 46 overcomes the friction between the preform and the bottle core module 32, extends forward, and ejects the preform. Similarly, if the diameter of the ejector pin 46 is smaller than the diameter of the control block 45, then under the same pressure, the extension distance of the ejector pin 46 will be greater than the movement distance of the control block 45.

[0044] Furthermore, existing molding modules are equipped with cooling circuits or cooling equipment. The injection molding equipment uses hydraulic principles to achieve efficient automatic unloading after the preform is injected and molded. The temperature balance of the core 44 is crucial to the preform molding process. Uneven temperature may lead to different wall thickness of the preform, affecting the mechanical properties and appearance quality of the preform. The hydraulic oil in the transmission channel 48 is a fluid with good heat conduction ability. Through the heat exchange of the hydraulic oil, the cooling process of the core 44 can be accelerated, thereby shortening the time of each molding cycle and improving production efficiency. Inside the bottle core module 32, the hydraulic oil fills the transmission channel 48 between the core 44 and the control block 45 to form a continuous heat conduction path. The hydraulic oil has a certain heat capacity and can absorb heat when the bottle core module 32 is working to prevent local overheating. At the same time, it releases heat during cooling to help maintain the stability of the temperature of the core 44. The uniform distribution of temperature helps to reduce the stress of the core 44 caused by thermal expansion and contraction, and prolong the service life of the mold.

[0045] See also Figure 1 , 3 4. The molding mechanism 2 also includes a mounting plate for fixing and supporting a driving component and other related components. The mounting plate is provided with a driving component for controlling the movement of the movable mold base 22. The driving component is usually implemented by an actuator such as a hydraulic cylinder, a pneumatic cylinder or an electric motor. When the driving component is working, it can push or pull the movable mold base 22 to move relative to the fixed mold base 21. When the driving component controls the movable mold base 22 to retract, the bottle core module 32 moves with the movable mold base 22. After the control block 45 and the mounting plate, with the movement of the movable mold base 22, it can play the effect of pushing the bottle core module 32. The pushing here refers to the distance between the movable mold base 22 and the bottle core module 32 to the fixed mold base 21. After the control block 45 and the mounting plate, the movable mold base 22 is moved away from the fixed mold base 21, while the distance between the bottle core module 32 and the fixed mold base 21 remains unchanged, which is similar to the effect of pushing the bottle core module 32.

[0046] A first spring 50 is provided between the control block 45 and the movable mold seat 22 to help the bottle core module 32 reset after demoulding is completed, and a second spring is provided between the control block 45 and the transmission block 47 to reset the bottle core module 32; after the preform is unloaded, the movable mold seat 22 approaches the fixed mold seat 21, and the bottle core module 32 is automatically reset under the action of the first spring 50 and the second spring. Before the preform is unloaded, the driving component always controls the movable mold seat 22 to move away from the fixed mold seat 21; after the preform is unloaded, the driving component works again to control the movable mold seat 22 to move toward the fixed mold seat 21. The first spring 50 and the second spring play a role in this process, pushing the control block 45 and the transmission block 47 back to their original positions, so that the bottle core module 32 completes the reset and is ready to enter the next molding cycle.

[0047] The movable mold base 22 is also provided with a limit assembly, which is used to constrain the movable space of the control block 45; ensuring that during the injection molding process, the control block 45 (together with the bottle core module 32) can be maintained at a predetermined position without being disturbed by external factors. When the injection molding equipment performs injection molding of the preform, by constraining the position of the control block 45, the position of the bottle core module 32 can be ensured to be accurate. If the position of the bottle core module 32 is offset, it may cause problems such as uneven wall thickness of the preform and misalignment of the bottle mouth. The limit assembly indirectly fixes the position of the bottle core module 32 by constraining the control block 45, ensuring that the bottle core module 32 can be accurately aligned with the bottle body module 31 each time molding is performed, thereby ensuring the size and shape accuracy of the preform.

[0048] Embodiment 2

[0049] The plastic preform injection molding device disclosed in this embodiment further defines the limiting component of the plastic preform injection molding device in the first embodiment;

[0050] The limiting assembly includes a connecting rod 52 slidably disposed on the movable mold seat 22, the connecting rod 52 connects the two sides of the movable mold seat 22, a block 53 is provided at one end of the connecting rod 52, and a limiting plate 54 is provided at the other end of the connecting rod 52, and the limiting plate 54 is located on the back of the control block 45. Specifically, before each molding cycle starts, the movable mold seat 22 and the fixed mold seat 21 are closed, the connecting rod 52 is limited in an appropriate position by the block 53, and the limiting plate 54 keeps in contact with or very close to the control block 45 to ensure that the bottle core module 32 is in the correct position. When the molten plastic is injected into the mold, the bottle core module 32 remains stationary, and the limiting plate 54 is limited by the combination of the connecting rod 52 and the block 53 to ensure that the position of the bottle core module 32 remains unchanged during the entire molding process, thereby ensuring the molding accuracy of the bottle preform. After the molding is completed, the movable mold base 22 begins to retreat, the connecting rod 52 moves with the movable mold base 22, and the contact between the limit plate 54 and the control block 45 is released, allowing the bottle core module 32 to rotate and eject according to a predetermined program.

[0051] Embodiment 3

[0052] The plastic preform injection molding device disclosed in this embodiment further defines the limiting component of the plastic preform injection molding device in the first embodiment;

[0053] The limiting assembly includes a connecting rod 52 slidably arranged on the movable mold seat 22, and the connecting rod 52 connects the two sides of the movable mold seat 22; a block 53 is provided at one end of the connecting rod 52, and the other end of the connecting rod 52 is limited and constrained in the annular groove, and the connecting rod 52 can move in the annular groove. Specifically, the movable mold seat 22 is closed with the fixed mold seat 21, one end of the connecting rod 52 is fixed in an appropriate position by the block 53, and the other end is located in the annular groove, limiting the moving range of the control block 45, ensuring that the bottle core module 32 is in the correct position before molding; when the molten plastic is injected into the mold, the bottle core module 32 remains stable, and the combination of the connecting rod 52 and the annular groove ensures that the bottle core module 32 will not be displaced unnecessarily, thereby ensuring the molding accuracy of the preform; after the molding is completed, the movable mold seat 22 is stroked, the connecting rod 52 slides in the annular groove, and the block 53 allows the connecting rod 52 to move axially along the movable mold seat 22, thereby allowing the bottle core module 32 to perform demolding actions, such as rotation and ejection.

[0054] Embodiment 4

[0055] This embodiment is a detailed decomposition of the process of the injection molding equipment in the above embodiment from completing one molding cycle to entering the next molding cycle:

[0056] 1. Injection molding is completed: After the injection molding of the preform is completed, the preform is still in a high temperature state and adheres to the bottle core module 32. At this time, the bottle core module 32, the bottle mouth module 33 and the bottle body module 31 are still in a closed state.

[0057] 2. Cooling: The preform needs to be cooled to a certain temperature before demoulding to avoid deformation of the preform due to overheating. The cooling system starts to work, taking away the heat from the mold through cooling water circulation or air cooling, thus speeding up the cooling of the preform.

[0058] During the injection molding and cooling process, the hydraulic oil fills the transmission channel 48 between the core body 44 and the control block 45 inside the bottle core module 32, forming a continuous heat conduction path; it can absorb heat when the bottle core module 32 is working to prevent local overheating, and release heat during cooling to help maintain the temperature stability of the core body 44.

[0059] 3. The movable mold base 22 retreats: After cooling is completed, the drive assembly starts to control the travel of the movable mold base 22, causing it to begin to retreat. At this time, the bottle core module 32 and the bottle mouth module 33 move with the movable mold base 22 and separate from the bottle body module 31, achieving preliminary demoulding.

[0060] 4. Preform ejection: Rotation and ejection of the core module 32: The movable mold base 22 continues to retreat, driving the core module 32 to rotate and move forward. Through the interaction between the limiting groove 42 of the core module 32 and the limiting protrusion 43 of the movable mold base 22, the core module 32 rotates to destroy the friction between the preform and the bottle mouth module 33. At the same time, the ejector rod 46 of the ejection mechanism extends to push the preform off the core module 32.

[0061] 5. Bottle embryo falls off: The bottle embryo completely falls off from the bottle core module 32 and falls into a pre-set collection device or conveyor belt, completing automatic unloading.

[0062] 6. Stroke reset of the movable mold base 22: After the preform is unloaded, the drive assembly works in the reverse direction to push the movable mold base 22 toward the fixed mold base 21 until the two are closed again.

[0063] 7. The bottle core module 32 is reset: Under the action of the first spring 50 and the second spring, the bottle core module 32 is automatically reset to the initial position, ready to enter the next molding cycle.

[0064] 8. Injection unit preparation: The injection unit begins to prepare for the next cycle of material injection, including the heating and metering of the molten plastic to ensure that the material quantity and temperature required for the next molding meet the requirements.

[0065] 9. The next molding cycle begins: When the movable mold base 22 and the fixed mold base 21 are completely closed, the injection unit injects the molten plastic into the mold at a high speed to fill the preform mold cavity and start the next molding cycle.

[0066] The technical effects of the present invention are mainly reflected in the following aspects:

[0067] The separate design of the bottle mouth module 33 and the bottle core module 32 of the injection molding equipment significantly reduces the demoulding resistance and improves the success rate and efficiency of demoulding; at the same time, the molding of the bottle mouth thread structure is transferred from the bottle body module 31 to the independent bottle mouth module 33, which not only reduces the wear rate of the bottle body module 31 and extends its service life, but also greatly reduces the replacement cost after the thread is worn, because only the bottle mouth module 33 needs to be replaced.

[0068] The introduced hydraulic oil not only serves as the power source of the ejection mechanism, but also transmits pressure through the hydraulic oil to automatically trigger the ejection mechanism by the movement of the bottle core module 32, so as to realize the automatic unloading of the formed bottle blanks and improve production efficiency; it also plays the role of balancing the temperature of the core body 44, ensuring the temperature control of the forming process, thereby improving the forming accuracy and consistency of the bottle blanks. The rapid reset mechanism of the bottle core module 32 greatly shortens the time of a single forming cycle and improves the throughput and overall production efficiency of the production line.

[0069] In addition, as common knowledge in the industry, the injection mechanism 6, the actuator and the liquid mentioned above are common knowledge, so their principles and structures will not be described in detail.

[0070] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. Plastic preform injection molding equipment, the injection molding equipment comprising a workbench and a molding mechanism arranged on the workbench, the molding mechanism comprising a fixed mold seat and a movable mold seat; characterized in that: The fixed mold seat is provided with a bottle body module, and the movable mold seat is provided with a bottle core module and a bottle mouth module; the bottle body module, the bottle core module and the bottle mouth module are arranged on the same center line, and the bottle body module and the bottle mouth module match to form an outer module of the bottle preform; the bottle mouth module contains a thread structure; when the bottle preform needs to be demoulded, the fixed mold seat and the movable mold seat move away from each other, and the thread structure can allow the bottle preform to move with the movable mold seat, so that the bottle preform can be separated from the bottle body module; the bottle core module is movably arranged on the movable mold seat; when the bottle preform is separated from the bottle body module, the bottle core module rotates and moves toward the fixed mold seat, so that the bottle preform can be separated from the bottle mouth module; The movable mold seat is provided with a communication port, and the bottle core module passes through both sides of the movable mold seat from the communication port; a limiting groove is provided on the outer wall of the end of the bottle core module, and at least a part of the limiting groove is spirally arranged; the inner wall of the communication port is provided with a limiting protrusion, and the limiting protrusion is located in the limiting groove; the bottle core module is pushed to move toward the fixed mold seat, and under the action of the spiral part of the limiting groove and the limiting protrusion, the bottle core module is rotated and moved toward the fixed mold seat; The front end of the bottle core module is provided with an ejection mechanism; when the preform is separated from the bottle mouth module, the ejection mechanism allows the preform to be ejected from the bottle core module, thereby realizing automatic unloading of the preform after injection molding; The bottle core module comprises a core body and a control block arranged at the end of the core body, a push rod is arranged at the front end of the core body, a transmission block is arranged at the front end of the control block, and a transmission channel is arranged in the core body and the control block; the push rod and the control block are located at both ends of the transmission channel, and form a sealed space of the transmission channel, and the sealed space is filled with liquid, so as to control the movement of the push rod and the control block; the bottle core module is pushed to move toward the fixed mold seat, and the control block will approach the movable mold seat, and when the transmission block contacts the movable mold seat; the bottle core module is continuously pushed to move the transmission block in the opposite direction, so that the push rod moves forward and the preform is pushed off from the bottle core module.

2. The plastic preform injection molding device according to claim 1, characterized in that: The molding mechanism also includes a mounting plate, on which a driving assembly for controlling the movement of the movable mold base is provided; When the driving component controls the movable mold base to retreat, the bottle core mold set moves along with the movable mold base, thereby achieving the effect of pushing the bottle core mold set; The push here refers to the distance between the movable mold seat and the bottle core mold set to the fixed mold seat. The movable mold seat is far away from the fixed mold seat, while the distance between the bottle core mold set and the fixed mold seat remains unchanged, which has the effect of pushing the bottle core mold set.

3. The plastic preform injection molding device according to claim 1, characterized in that: A first spring is provided between the control block and the movable mold seat, and a second spring is provided between the control block and the transmission block; After the blanking of the bottle embryo is completed, the movable mold seat moves closer to the fixed mold seat, and under the action of the first spring and the second spring, the bottle core module is automatically reset.

4. The plastic preform injection molding device according to claim 1 or 3, characterized in that: A limit assembly is also provided on the movable mold base, and the limit assembly is used to constrain the activity space of the control block; When the injection molding device performs injection molding of a preform, the position of the bottle core module can be ensured to be accurate by constraining the position of the control block.

5. The plastic preform injection molding device according to claim 4, characterized in that: The limiting assembly includes a connecting rod slidably arranged on the movable mold base, the connecting rod connects the two sides of the movable mold base, one end of the connecting rod is provided with a clamping block, the other end of the connecting rod is provided with a limiting plate, and the limiting plate is located on the back of the control block.

6. The plastic preform injection molding device according to claim 4, characterized in that: The control block is provided with an annular groove; The limiting assembly includes a connecting rod slidably arranged on the movable mold base, the connecting rod connects the two sides of the movable mold base; a clamping block is provided at one end of the connecting rod, and the other end of the connecting rod is limited and constrained in the annular groove, and the connecting rod can move in the annular groove.

7. The plastic preform injection molding device according to claim 1, characterized in that: The injection molding equipment also includes an injection mechanism arranged on the workbench; The injection mechanism comprises an injection cylinder, a screw rod arranged in the injection cylinder, a discharge hopper arranged on the injection cylinder, and a motor for driving the screw rod to rotate.

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