A rapid prototyping mold for injection molding preforms

Abstract

This invention relates to a rapid prototyping mold for injection molding bottle preforms, comprising a base, a top plate, and a support rod disposed between the two. A first sliding plate and a second sliding plate are slidably disposed between the base and the top plate. A bottle body module is disposed on the base. A rotating component and a bottle neck module driven by the rotating component are disposed on the first sliding plate. A fixing component is disposed on the first sliding plate, and a top extension component is disposed on the fixing component. A bottle core module is disposed on the second sliding plate. The bottle body module, bottle neck module, and bottle core module are used to fit together and form a bottle preform through injection molding. The second sliding plate is used to lower the bottle preform and disengage it from the bottle body module while simultaneously lowering the first sliding plate. The fixing component is used to fix the bottle preform while the second sliding plate continues to lower and disengage the bottle core module from the bottle preform after the first sliding plate comes to a stop. The rotating component is used to disengage the bottle neck module from the bottle preform while the second sliding plate disengages the bottle core module from the bottle preform, preventing thread slippage and ensuring that the bottle preform can be smoothly demolded.

Description

Technical Field

[0001] This invention relates to the field of mold manufacturing technology, and more specifically to a rapid prototyping mold for injection molding preforms. Background Technology

[0002] Plastic bottles are generally made from raw materials such as polyester, polyethylene, and polypropylene. After adding appropriate organic solvents, they are heated at high temperatures and then formed through injection molding, extrusion blow molding, or blow molding using plastic molds. Chinese patent CN 118832806B discloses an injection molding equipment for plastic bottle preforms. The equipment includes a molding mechanism comprising a fixed mold base and a moving mold base. The fixed mold base houses a bottle body module, while the moving mold base houses a bottle core module and a bottle neck module. The bottle neck module contains a threaded structure. This injection molding equipment features a separate design for the bottle neck and core modules, significantly reducing demolding resistance and improving demolding success rate and efficiency. Furthermore, transferring the molding of the bottle neck threaded structure from the bottle body module to a separate bottle neck module not only reduces the wear rate of the bottle body module and extends its service life but also significantly reduces replacement costs after thread wear, as only the bottle neck module needs to be replaced.

[0003] However, the inventors discovered that in this injection molding equipment, during demolding, the rotation of the core module can effectively disrupt the contact between the preform and the mouth module, reducing friction during demolding and making it easier for the preform to detach from the mouth module. However, during detachment, the threads are prone to slippage, making it impossible to guarantee that the preform will detach smoothly. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a rapid prototyping mold for injection-molded bottle preforms. By fixing the preform and then separating the bottle neck module from the preform, the thread slippage is prevented, ensuring that the preform can be smoothly demolded.

[0005] The technical solution of the present invention is as follows:

[0006] A rapid prototyping mold for injection molding bottle preforms includes a base, a top plate, and a support rod disposed between the two. A first sliding plate and a second sliding plate are slidably disposed between the base and the top plate. A bottle body module is disposed on the base. A rotating component and a bottle neck module driven by the rotating component are disposed on the first sliding plate. A fixing component and an ejector component are disposed on the fixing component. A bottle core module is disposed on the second sliding plate. The bottle body module, bottle neck module, and bottle core module are used to fit together and form a bottle preform through injection molding. The second sliding plate is used to lower the bottle preform and disengage it from the bottle body module while simultaneously lowering the first sliding plate. The fixing component is used to fix the bottle preform while the second sliding plate continues to lower and disengage it from the bottle preform after the first sliding plate comes to a stop. The rotating component is used to disengage the bottle neck module from the bottle preform while the second sliding plate disengages the bottle core module from the bottle preform. The ejector component is used to eject the bottle preform.

[0007] As a preferred embodiment, the fixing component includes a fixing ring fixedly mounted on the first slide plate, a pressure tube fixedly mounted on the base, a sliding rod slidably mounted inside the pressure tube, and a plurality of air blowing holes opened on the sliding rod. The fixing ring is compatible with the bottle body module and the bottle mouth module.

[0008] As a preferred embodiment, the rotating assembly includes an internal thread formed on the bottle mouth module, a through hole formed on the first sliding plate, an external thread formed on the through hole, a telescopic tube fixedly mounted on the bottle mouth module, a limiting plate fixedly mounted at the end of the telescopic tube, and a limiting groove formed on the second sliding plate, wherein the limiting plate and the limiting groove cooperate, and the internal thread and the external thread cooperate.

[0009] As a preferred embodiment, the top extension assembly includes a slider fixedly mounted on a sliding rod, a through groove formed in the middle of the bottle core module, a slide groove formed in the through groove, a support frame fixedly mounted on a base, a motor fixedly mounted on the support frame, a drive gear fixedly mounted on the motor output shaft, a nut rotatably mounted on the support frame, and a driven gear fixedly mounted on the nut. The slider engages with the slide groove, the sliding rod slides with the through groove, and the nut is threadedly connected to the sliding rod.

[0010] As a preferred embodiment, the first slide plate is provided with a plurality of sliding cylinders that cooperate with the support rod, and a spring is provided between the two.

[0011] As a preferred embodiment, a limit block and a drive rod fixedly mounted on the limit block are fixedly provided on the second slide plate.

[0012] As a preferred embodiment, the first slide plate has slots on both sides, and the slots are matched with the drive rod.

[0013] As a preferred embodiment, the first slide plate is provided with a rubber pad, and the rubber pad cooperates with the limiting block.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. The present invention is provided with a fixing component. After the second sliding plate drives the preform to separate from the bottle body module, it drives the bottle core module to separate from the preform. Then, by applying pressure to the inside of the preform, the preform abuts against the fixing ring and is fixed.

[0016] 2. The present invention also includes a rotating component, in which the bottle core module drives the bottle mouth module to descend while rotating, so that the threads on the inner side of the bottle mouth module engage with the threads on the outer side of the bottle preform, which facilitates the disengagement of the bottle mouth module from the bottle preform and prevents the threads from slipping.

[0017] In summary, this invention has the advantages of good injection molding effect and high demolding efficiency, and is suitable for the field of mold production technology. Attached Figure Description

[0018] The invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a rapid prototyping mold for injection molding bottle preforms;

[0020] Figure 2 A schematic diagram showing the open state of the bottle body module and the bottle neck module;

[0021] Figure 3 This is a schematic diagram of the first skateboard.

[0022] Figure 4 This is a schematic diagram of the rotating assembly.

[0023] Figure 5 This is a cross-sectional diagram showing the state during mold closing;

[0024] Figure 6 This is a cross-sectional diagram showing the state during mold opening;

[0025] Figure 7 This is a schematic diagram illustrating the state during the mold opening process;

[0026] Figure 8 A cross-sectional view of the bottle body module and the bottle neck module;

[0027] Figure 9 for Figure 8 Enlarged view of point A;

[0028] Figure 10 This is a schematic diagram of a partial state during the mold opening process;

[0029] Figure 11 for Figure 10 Enlarged view of point B;

[0030] Figure 12 This is a structural diagram of the fixed component;

[0031] Figure 13 for Figure 12 Enlarged diagram of point C.

[0032] Reference numerals in the attached drawings: 1. Base, 2. Top plate, 3. Support rod, 4. First sliding plate, 5. Second sliding plate, 6. Bottle body module, 7. Rotating assembly, 71. Internal thread, 72. Through hole, 73. External thread, 74. Telescopic tube, 75. Limiting plate, 76. Limiting groove, 8. Bottle mouth module, 9. Fixing assembly, 91. Fixing ring, 92. Pressurizing tube, 93. Sliding rod, 94. Air blowing hole, 10. Bottle core module, 11. Bottle preform, 12. Sliding cylinder, 13. Spring, 14. Limiting block, 15. Drive rod, 16. Slot, 17. Top extension assembly, 171. Slider, 172. Through groove, 173. Slide groove, 174. Support frame, 175. Motor, 176. Driving gear, 177. Nut, 178. Passive gear. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0034] Example 1

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] like Figures 1 to 13 As shown, a rapid prototyping mold for injection molding bottle preforms includes a base 1, a top plate 2, and a support rod 3 disposed between the two. A first sliding plate 4 and a second sliding plate 5 are slidably disposed between the base 1 and the top plate 2. A bottle body module 6 is disposed on the base 1. A rotating component 7 and a bottle neck module 8 driven by the rotating component 7 are disposed on the first sliding plate 4. A fixing component 9 is disposed on the first sliding plate 4, and a top extension component 17 is disposed on the fixing component 9. A bottle core module 10 is disposed on the second sliding plate 5. The bottle body module 6, the bottle neck module 8, and the bottle core module 10 are fitted together to form a bottle preform 1 through injection molding. 1. The second slide plate 5 is used to drive the preform 11 down and separate from the bottle body module 6, while driving the first slide plate 4 down. The fixing component 9 is used to fix the preform 11 while the second slide plate 5 continues to drive the core module 10 down and separate from the preform 11 after the first slide plate 4 stops. The rotating component 7 is used to drive the bottle mouth module 8 to separate from the preform 11 while the second slide plate 5 drives the core module 10 to separate from the preform 11. The top extension component 17 is used to push out the preform 11. The top plate 2 is connected to an injection molding machine, and an injection port is connected between the injection molding machine and the top plate 2 for injection molding.

[0037] It is worth mentioning that, such as Figures 5 to 9 As shown, the fixing component 9 includes a fixing ring 91 fixedly mounted on the first sliding plate 4, a pressure tube 92 fixedly mounted on the base 1, a sliding rod 93 slidably mounted inside the pressure tube 92, and several air holes 94 opened on the sliding rod 93. The fixing ring 91 fits into the bottle body module 6 and the bottle mouth module 8. An air pump is connected to the pressure tube 92. In use, the second sliding plate 5 and the first sliding plate 4 rise, causing the bottle mouth module 8, the bottle core module 10, the fixing ring 91, and the bottle body module 6 to fit together, forming an injection cavity. Then, the injection plastic flows into the injection cavity through the injection port on the top plate 2 to form the preform 11. During demolding, the second sliding plate 5 and the first sliding plate 4 descend. Due to the threads on the bottle mouth module 8, the preform 11 can follow and descend. Therefore, the preform 11 fits into the bottle body module 6. First, the bottle core module 10 detaches, then the first slide plate 4 stops descending, and the second slide plate 5 drives the bottle core module 10 to continue descending. The bottle core module 10 detaches from the bottle preform 11. At this time, the air pump is turned on. After the pressure value is set, the airflow passes through the air blowing hole 94 to blow air and pressurize the bottle preform 11, so that the bottle preform 11 abuts against the fixing ring 91, thereby fixing the bottle preform 11. After setting an appropriate value, the bottle preform 11 will not be deformed or damaged during pressurization. In addition, during the process of the bottle core module 10 detaching from the bottle preform 11, the space between the two gradually increases. Therefore, the air pump always inputs gas into the bottle preform 11, so that the air pressure in the bottle preform 11 is always maintained at the set value, and the bottle preform 11 and the fixing ring 91 are always kept in a tight state until the bottle core module 10 is completely removed from the bottle preform 11, and the air pump stops working.

[0038] It needs to be emphasized that, such as Figure 10 and Figure 11As shown, the rotating assembly 7 includes an internal thread 71 on the bottle neck module 8, a through hole 72 on the first sliding plate 4, an external thread 73 on the through hole 72, a telescopic tube 74 fixedly mounted on the bottle neck module 8, a limiting plate 75 fixedly mounted at the end of the telescopic tube 74, and a limiting groove 76 on the second sliding plate 5. The limiting plate 75 and the limiting groove 76 cooperate, and the internal thread 71 and the external thread 73 cooperate. In use, the second sliding plate 5 drives the bottle core module 10 to descend while simultaneously pulling the telescopic tube 74 to lengthen. When the bottle preform 11 abuts against the fixing ring 91, the telescopic tube 74 extends... When the constriction space is stretched to its limit, that is, when the second slide plate 5 continues to pull the bottle core module 10, the bottle core module 10 will pull the bottle mouth module 8 down simultaneously through the telescopic tube 74. Then, the internal thread 71 and the external thread 73 engage, causing the bottle mouth module 8 to rotate while it is descending. The thread on the inner side of the bottle mouth module 8 engages with the thread on the outer side of the bottle preform 11, and the bottle core module 10 exits from the bottle preform 11. The air pressure inside the bottle preform 11 is released, the air pump stops working, and the telescopic tube 74 rotates in the limiting groove 76 through the limiting plate 75 until the bottle mouth module 8 extends into the through hole 72 and is completely separated from the bottle preform 11.

[0039] It needs to be emphasized that, such as Figure 12 and Figure 13 As shown, the top extension assembly 17 includes a slider 171 fixedly mounted on the sliding rod 93, a through groove 172 formed in the middle of the bottle core module 10, a slide groove 173 formed in the through groove 172, a support frame 174 fixedly mounted on the base 1, a motor 175 fixedly mounted on the support frame 174, a drive gear 176 fixedly mounted on the output shaft of the motor 175, a nut 177 rotatably mounted on the support frame 174, and a driven gear 178 fixedly mounted on the nut 177. The slider 171 engages with the slide groove 173, the sliding rod 93 slides with the through groove 172, and the nut 177 is threadedly connected to the sliding rod 93. In use, after the bottle core module 10 and the bottle neck module 8 are both disengaged from the bottle preform 11, the motor 171... 5. Rotation drives the active gear 176 and passive gear 178 to rotate, which in turn drives the nut 177 to rotate. This causes the sliding rod 93 to slide within the groove 173 via the slider 171, disengaging the preform 11 from the fixing ring 91. The preform can then be removed manually or by a robotic arm, completing the demolding process. Subsequently, the motor 175 reverses, causing the sliding rod 93 to descend and reset. After the next injection, the second sliding plate 5 drives the bottle core module 10 to rise, first fully retracting the telescopic tube 74, and then rotating the bottle mouth module 8 while simultaneously rising and resetting it to match the fixing ring 91. Finally, the second sliding plate 5 drives the first sliding plate 4 to rise, causing the fixing ring 91 to match the bottle body module 6. The top surface of the sliding rod 93 is flush with the top surface of the bottle core module 10, allowing for the next injection.

[0040] It should be further explained that, such as Figure 1As shown, the first slide plate 4 is provided with several sliding cylinders 12 that cooperate with the support rod 3, and a spring 13 is provided between the two. The sliding cylinders 12 slide on the slide grooves on the support rod 3 by means of a slider, and the sliding path of the sliding cylinders 12 can be controlled. When the second slide plate 5 descends, the first slide plate 4 follows the second slide plate 5 down due to the spring 13 and its own weight, until the slider slides to the bottom of the slide groove, and the sliding cylinders 12 stop sliding. This action can complete the above-mentioned separation of the preform 11 from the bottle body module 6, and the preform 11 remains stationary, which facilitates the continued descent of the bottle core module 10.

[0041] It is worth mentioning that, such as Figure 1 As shown, a limit block 14 is fixedly installed on the second slide plate 5, and a drive rod 15 is fixedly installed on the limit block 14. A drive device is connected to the drive rod 15 to drive the second slide plate 5 to rise or fall.

[0042] In addition, such as Figure 3 As shown, the first slide plate 4 has slots 16 on both sides and the slots 16 cooperate with the drive rod 15. When the second slide plate 5 rises and resets, the first slide plate 4 is lifted by the limit block 14.

[0043] It is worth mentioning that, such as Figure 5 As shown, a rubber pad is provided on the first slide plate 4 and the rubber pad cooperates with the limiting block 14. The rubber pad can reduce wear.

[0044] Work process

[0045] The second sliding plate 5 and the first sliding plate 4 rise, causing the bottle neck module 8, the bottle core module 10, the fixing ring 91, and the bottle body module 6 to align and form an injection cavity. The injection plastic then flows into the injection cavity through the injection port on the top plate 2 to form the preform 11. Demolding then occurs. During demolding, the second sliding plate 5 and the first sliding plate 4 descend. Due to the threads on the bottle neck module 8, the preform 11 descends accordingly. The preform 11 separates from the bottle body module 6 first, then the first sliding plate 4 stops descending. The second sliding plate 5 then causes the bottle core module 10 to continue descending, and the bottle core module 10 and... When the preform 11 detaches, the air pump is activated. After the pressure setting is completed, airflow passes through the air inlet 94 to pressurize the preform 11, causing it to contact the retaining ring 91. Simultaneously, the second sliding plate 5 pulls the core module 10 downwards, extending the telescopic tube 74. When the preform 11 contacts the retaining ring 91, the telescopic tube 74's extension range is maximized. This means that as the second sliding plate 4 continues to pull the core module 10, the core module 10, through the telescopic tube 74, pulls the bottle neck module 8 downwards. Then, the internal thread 71 and the external thread 73... The engagement causes the bottle neck module 8 to descend and rotate simultaneously. The inner thread of the bottle neck module 8 engages with the outer thread of the bottle preform 11, causing the bottle core module 10 to exit from the bottle preform 11. The air pressure inside the bottle preform 11 is released, the air pump stops working, and the telescopic tube 74 rotates within the limiting groove 76 via the limiting plate 75 until the bottle neck module 8 extends into the through hole 72 and disengages from the bottle preform 11. The motor 175 then rotates, driving the active gear 176 and the passive gear 178 to rotate, which in turn drives the nut 177 to rotate, causing the sliding rod 93 to slide within the slide groove 173 via the slider 171. The preform 11 is detached from the fixing ring 91 and can be removed manually or by a robot later to complete demolding. Then, the motor 175 reverses and drives the sliding rod 93 to descend and reset. After the next injection, the second slide plate 5 drives the bottle core module 10 to rise, first fully retracting the telescopic tube 74, and then driving the bottle mouth module 8 to rotate and rise to reset, matching the fixing ring 91. Finally, the second slide plate 5 drives the first slide plate 4 to rise, so that the fixing ring 91 matches the bottle body module 6, and the top surface of the sliding rod 93 is flush with the top surface of the bottle core module 10, for the next injection.

[0046] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0047] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0048] The above description, in conjunction with the accompanying drawings, represents only preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention. These modifications and improvements should also be considered within the scope of protection of the present invention and will not affect the effectiveness and practicality of the present invention.

Claims

1. A rapid prototyping mold for injection molding preforms, comprising a base (1), a top plate (2), and a support rod (3) disposed between the two, characterized in that: A first sliding plate (4) and a second sliding plate (5) are slidably disposed between the base (1) and the top plate (2). A bottle body module (6) is disposed on the base (1). A rotating component (7) and a bottle mouth module (8) driven by the rotating component (7) are disposed on the first sliding plate (4). A fixing component (9) is disposed on the first sliding plate (4). A top extension component (17) is disposed on the fixing component (9). A bottle core module (10) is disposed on the second sliding plate (5). The bottle body module (6), the bottle mouth module (8) and the bottle core module (10) are used to fit together and form a bottle by injection molding. The preform (11), the second slide plate (5) is used to drive the preform (11) down and separate from the bottle body module (6) while driving the first slide plate (4) down. The fixing component (9) is used to fix the preform (11) while the second slide plate (5) continues to drive the bottle core module (10) down and separate from the preform (11) after the first slide plate (4) stops. The rotating component (7) is used to drive the bottle mouth module (8) to separate from the preform (11) while the second slide plate (5) drives the bottle core module (10) to separate from the preform (11). The top extension component (17) is used to push out the preform (11).

2. The rapid prototyping mold for injection molding preforms according to claim 1, characterized in that: The fixing component (9) includes a fixing ring (91) fixed on the first slide plate (4), a pressurizing tube (92) fixed on the base (1), a sliding rod (93) slidably disposed in the pressurizing tube (92), and a plurality of air holes (94) opened on the sliding rod (93). The fixing ring (91) matches the bottle body module (6) and the bottle mouth module (8).

3. The rapid prototyping mold for injection molding preforms according to claim 1, characterized in that: The rotating assembly (7) includes an internal thread (71) on the bottle mouth module (8), a through hole (72) on the first sliding plate (4), an external thread (73) on the through hole (72), a telescopic tube (74) fixedly mounted on the bottle mouth module (8), a limiting plate (75) fixedly mounted at the end of the telescopic tube (74), and a limiting groove (76) on the second sliding plate (5). The limiting plate (75) and the limiting groove (76) cooperate with each other, and the internal thread (71) and the external thread (73) cooperate with each other.

4. A rapid prototyping mold for injection molding preforms according to claim 2, characterized in that: The top extension assembly (17) includes a slider (171) fixedly mounted on a sliding rod (93), a through groove (172) opened in the middle of the bottle core module (10), a slide groove (173) opened in the through groove (172), a support frame (174) fixedly mounted on a base (1), a motor (175) fixedly mounted on the support frame (174), an active gear (176) fixedly mounted on the output shaft of the motor (175), a nut (177) rotatably mounted on the support frame (174), and a passive gear (178) fixedly mounted on the nut (177). The slider (171) cooperates with the slide groove (173), the sliding rod (93) slides with the through groove (172), and the nut (177) is threadedly connected to the sliding rod (93).

5. A rapid prototyping mold for injection molding preforms according to claim 1, characterized in that: The first slide plate (4) is provided with several sliding cylinders (12) that cooperate with the support rod (3), and a spring (13) is provided between the two.

6. A rapid prototyping mold for injection molding preforms according to claim 1, characterized in that: The second slide (5) is fixedly provided with a limit block (14) and a drive rod (15) fixedly provided on the limit block (14).

7. A rapid prototyping mold for injection molding preforms according to claim 6, characterized in that: The first slide plate (4) has slots (16) on both sides and the slots (16) are matched with the drive rod (15).

8. A rapid prototyping mold for injection molding preforms according to claim 6, characterized in that: The first slide (4) is provided with a rubber pad and the rubber pad cooperates with the limiting block (14).

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