Overmolding mold and method

Abstract

This application relates to the technical field of molds, and provides a secondary molding mold and method. The secondary molding mold includes a bottom mold and a top mold. The bottom mold includes a support portion and two side portions, which are symmetrically distributed on both sides of the support portion. A positioning hole is provided on the side wall of the top mold, located on one side of the insertion hole. Insertion pins and positioning pins are respectively provided on the surface of the support portion. A first shaping groove is provided on the side wall of the support portion near the side portion, and a second shaping groove is provided on the side wall of the side portion near the support portion. An injection channel is formed between the first and second shaping grooves. The top mold covers the injection channel and abuts against the surface of the top mold away from the insertion hole. The secondary molding mold of this application can improve the molding quality of bottle caps.

Description

Technical Field

[0001] This application relates to the technical field of molds, and in particular to secondary molding molds and methods. Background Technology

[0002] Molds are specialized tools used in industrial production to mold various materials (such as metals, plastics, and rubber). Through cavities or surfaces of specific shapes, they induce physical or chemical changes in the material, ultimately obtaining parts with the required dimensions, shapes, and properties. They are widely used in manufacturing and are essential process equipment for the mass production of standardized products.

[0003] In the prior art, referring to Figure 1 This type of bottle cap 7 product includes a cap 71 and two brims 72, which are spaced apart on the side wall of the cap 71. The side wall of the cap 71 near the brims 72 has a insertion hole 711. In use, the bottle mouth is inserted into the insertion hole 711 of the cap 71, and the cap 71 uses the two brims 72 to clamp the bottle body, thereby closing the bottle mouth.

[0004] These types of bottle caps are often manufactured using a one-step injection molding process, where molten material is injected into the mold cavity, forming the cap and two brims as a single piece. While this one-step molding reduces the number of molding steps, the resulting bottle cap has a large contact area with the mold cavity wall, increasing the risk of scratches on the cap surface during ejection. This leads to poor molding quality and a higher defect rate. Therefore, more and more manufacturers are opting for a two-step molding process, where the cap is molded separately, and then the two brims are formed using a secondary molding die to produce the final bottle cap product.

[0005] However, during the secondary molding process, it was found that due to the lack of a reliable limiting structure for the cap, the cap's position was prone to shift when it was placed into the secondary molding mold cavity or during the injection molding process. This resulted in a deviation between the actual installation point and the set point of the cap, leading to poor molding quality. Therefore, further improvements are needed. Summary of the Invention

[0006] To improve the molding quality of bottle caps, this application provides a secondary molding die and method.

[0007] Firstly, the secondary molding die provided in this application adopts the following technical solution: A secondary molding die includes a bottom mold and a top mold. The bottom mold includes a support portion and two side portions, which are symmetrically distributed on both sides of the support portion. The side wall of the top mold has a positioning hole located on one side of the insertion hole. The surface of the support portion is provided with an insertion post for inserting into the insertion hole and a positioning post for inserting into the positioning hole. The side wall of the support portion near the side portion has a first shaping groove, and the side wall of the side portion near the support portion has a second shaping groove. An injection channel is formed between the first shaping groove and the second shaping groove. The top mold covers the injection channel and abuts against the surface of the top mold away from the insertion hole.

[0008] By adopting the above technical solution, the molded cap is placed on the support, with the insert pins of the support inserted into the insert holes and the positioning pins inserted into the positioning holes. The cooperation of the insert pins and positioning pins ensures the cap is positioned correctly, preventing any displacement of the cap during insertion into the secondary molding mold cavity or during injection molding. After the cap is installed, the cap mold is closed onto the injection channel of the bottom mold, allowing the cap mold to abut against the cap, strengthening the fixation and thus improving the molding quality of the bottle cap product.

[0009] Optionally, a sliding strip is slidably installed in the injection channel, and the sliding strip is connected to an injection head facing the cover mold. An exhaust hole is opened on the side of the injection channel away from the cover mold. The bottom mold is provided with a driving component for driving the sliding strip to slide. During injection, the driving component drives the sliding strip to slide from the side of the injection channel close to the cover mold to the side of the injection channel away from the cover mold.

[0010] By adopting the above technical solution, the injection head is positioned on the sliding strip. Before injection, the sliding strip moves to the side of the injection channel closer to the cap mold, closing the cap mold onto the bottom mold. Then, molten plastic material is injected into the area between the sliding strip and the cap mold through the injection head. During this process, the driving component drives the sliding strip to gradually slide away from the cap mold, allowing the material to gradually fill the entire injection channel. When the sliding strip moves to the side of the injection channel away from the cap mold, it finally cools and forms the cap brim. By using the sliding strip to drive the injection head to slide, the effect of simultaneous injection and venting is achieved, reducing air mixed in within the injection channel and improving the molding quality of the bottle cap product.

[0011] Optionally, the driving assembly includes a driving bar, a driving screw, and a driving component. The driving bar is slidably installed on the side of the bottom mold away from the top mold. The driving bar is connected to a sliding rod, one end of which extends out of the injection channel and is connected to the driving bar. The driving screw is rotatably installed on the bottom mold and threaded through the driving bar. The driving component is disposed on the bottom mold to drive the driving screw to rotate.

[0012] By adopting the above technical solution, the rotation of the drive screw causes the drive bar to slide, thereby allowing the slide bar to move closer to or further away from the cap mold, so as to facilitate the injection molding and demolding of the bottle cap product.

[0013] Optionally, the driving component includes a driving disc, a driven disc, and a driving motor. The driving disc is rotatably mounted on the bottom mold, and the driven disc is coaxially mounted on the driving screw. The outer peripheral wall of the driving disc is provided with an arc-shaped rack, and the outer peripheral wall of the driven disc is provided with a circular gear ring. The arc-shaped rack and the circular gear ring mesh and transmit power. The driving motor is mounted on the bottom mold, and the output shaft of the driving motor is coaxially connected to the driving disc.

[0014] By adopting the above technical solution, during injection molding, the drive motor rotates the active disc, and the driven disc rotates intermittently under the meshing of the arc-shaped rack and the circular gear ring. This allows the sliding bar to slide intermittently away from the mold cover. The effect is that during the process of the arc-shaped rack disengaging from the circular gear ring, the sliding bar is in a stopped state, while the injection head continuously injects raw material into the area between the sliding bar and the mold cover, thus making the raw material between the sliding bar and the mold cover more compacted. As the active disc continues to rotate, the sliding bar repeatedly pauses as it moves away from the mold cover, thereby repeatedly pressurizing and compacting the raw material in the injection channel, improving the injection molding effect.

[0015] Optionally, the driving disc has a first limiting arc surface, and the driven disc is provided with a limiting frame, the limiting frame having a second limiting arc surface. When the arc-shaped rack disengages from the circular gear ring, the first limiting arc surface and the second limiting arc surface abut against each other to restrict the rotation of the driven disc; when the arc-shaped rack meshes with the circular gear ring, the first limiting arc surface disengages from the second limiting arc surface.

[0016] By adopting the above technical solution, the contact between the first limiting arc surface and the second limiting arc surface is used to restrict the free rotation of the driven disk when the arc-shaped rack disengages from the circular gear ring, that is, to restrict the displacement of the sliding bar and keep the sliding bar in a stopped state.

[0017] Optionally, the side wall near the support is provided with an installation groove, and a shaping plate is installed inside the groove. The second shaping groove is provided with the shaping plate near the support. The side of the shaping plate near the cover mold is hinged to the inner wall of the installation groove. The cover mold is connected to a positioning rod, one end of which passes through the installation groove. The surface of the shaping plate away from the support is provided with a positioning block, and the positioning block is provided with a through groove for the positioning rod to pass through. The positioning rod is provided with a pusher for pushing the shaping plate to flip.

[0018] By adopting the above technical solution, after the raw material in the injection channel cools and is formed, the pushing component forces the shaping plate to rotate at a certain angle, thereby causing the shaping plate to peel off the surface of the cap brim, so as to facilitate the demolding of the bottle cap product.

[0019] Optionally, the positioning rod has an abutment block on its peripheral wall. When the cover mold is closed on the bottom mold, the abutment block abuts against the through groove of the positioning block to restrict the free rotation of the shaping plate. The pushing member includes a pushing block disposed on the positioning rod. The pushing block is located on the side of the abutment block away from the cover mold. When the cover mold is lifted away from the bottom mold, the pushing block pushes the shaping plate through the positioning block and forces the side of the shaping plate away from the cover plate to flip away from the support.

[0020] By adopting the above technical solution, when the cover mold is closed on the bottom mold, the positioning rod passes through the through-groove of the positioning block, and the abutment block abuts against the inner wall of the through-groove, restricting the free rotation of the shaping plate, so as to facilitate the injection of molten raw material into the injection channel. After the brim is formed, it is lifted away from the cover mold, causing the abutment block to disengage from the through-groove. At this time, the pushing block pushes against the inner wall of the through-groove, thereby causing the shaping plate to flip away from the support part to peel off the surface of the brim, improving the overall ease of operation.

[0021] Optionally, an air blowing pipe is connected inside the injection channel, and the air blowing pipe is located on the side of the injection channel away from the cover mold. A cooling channel is opened in the support part, and one end of the cooling channel is connected to the injection channel. A mating sleeve is provided on the side wall of the sliding strip away from the cover mold. A connecting channel is opened inside the sliding strip, and the connecting channel is connected to the inside of the mating sleeve. When the sliding strip slides to the side of the injection channel away from the cover mold, the connecting channel is connected to the cooling channel and the mating sleeve is fitted onto the air blowing pipe.

[0022] By adopting the above technical solution, after the sliding bar slides to the side of the injection channel away from the cover mold, the injection channel is filled with raw material. Cooling gas is blown into the connecting channel using an air blowing pipe. The cooling gas enters the cooling channel through the connecting channel, carrying away heat and improving cooling efficiency.

[0023] Optionally, the outer peripheral wall of the air blowing pipe is provided with multiple air blowing holes, and the outer peripheral wall of the air blowing pipe is fitted with an opening and closing ring. A return spring is provided between the opening and closing ring and the air blowing pipe. The return spring forces the opening and closing ring to close all the air blowing holes. The inner diameter of the mating sleeve is larger than the outer diameter of the air blowing pipe. When the sliding bar slides to the side of the injection channel away from the cover mold, the mating sleeve pushes the opening and closing ring to open all the air blowing holes.

[0024] By adopting the above technical solution, under normal conditions, the opening and closing ring closes all air blowing holes under the action of the return spring. When the sliding bar slides to the side of the injection channel away from the cover mold, the mating sleeve pushes the opening and closing ring to slide, thereby opening all air blowing holes to cool the raw material in the injection channel and improving the overall ease of operation.

[0025] Secondly, the secondary molding method provided in this application adopts the following technical solution: The secondary molding method specifically includes the following steps: S1, cap placement: placing the molded cap into the bottom mold; S2, mold closing: closing the top mold onto the bottom mold; S3, injection molding: injecting molten raw material into the injection channel; S4, cooling and mold opening.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By using insert pins and positioning pins, the molded cap is placed on the support, with the insert pins of the support inserting into the insert holes and the positioning pins inserting into the positioning holes. The cooperation of the insert pins and positioning pins ensures the cap is positioned correctly, preventing potential displacement during insertion into the secondary molding mold cavity or during injection molding. After the cap is installed, the cap mold is closed onto the injection channel of the bottom mold, allowing the cap mold to abut against the cap, strengthening the fixation and improving the molding quality of the bottle cap product. 2. By using a sliding strip, before injection molding, the sliding strip moves to the side of the injection channel closest to the cap mold, closing the cap mold onto the bottom mold. Then, molten plastic material is injected into the area between the sliding strip and the cap mold through the injection head. During this process, the drive component propels the sliding strip to gradually slide away from the cap mold, allowing the material to gradually fill the entire injection channel. When the sliding strip reaches the side of the injection channel away from the cap mold, it finally cools and forms the cap. Utilizing the sliding strip to drive the injection head achieves the effect of simultaneous injection and venting, reducing air contamination within the injection channel and improving the molding quality of the bottle cap product. 3. By using a drive disc and a driven disc, during injection molding, the drive motor rotates the drive disc. The meshing of the arc-shaped rack and the circular gear ring enables the driven disc to rotate intermittently, allowing the sliding bar to slide intermittently away from the mold cover. The effect is that as the arc-shaped rack disengages from the circular gear ring, the sliding bar stops moving, while the injection head continuously injects material into the area between the sliding bar and the mold cover, thus compacting the material between them. As the drive disc continues to rotate, the sliding bar repeatedly pauses as it moves away from the mold cover, repeatedly pressurizing and compacting the material in the injection channel, improving the injection molding effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the structure of a bottle cap in the background art; Figure 2 This is a cross-sectional view of the overall structure of Embodiment 1; Figure 3 This is a schematic diagram illustrating the structure of the support portion in Embodiment 1; Figure 4 This is a schematic diagram of the side structure in Embodiment 1; Figure 5 This is a partial cross-sectional view of the driving component in Embodiment 2; Figure 6 This is a schematic diagram illustrating the structure of the slider in Embodiment 2; Figure 7 This is a partial cross-sectional view of Embodiment 3 showing the driving disk and the driven disk; Figure 8 This is a partial cross-sectional view of Embodiment 3, illustrating the first and second limiting arc surfaces; Figure 9 This is a partial sectional view of the shaping plate in Example 4; Figure 10 yes Figure 9 Enlarged view of point A in the middle; Figure 11 This is a partial cross-sectional view of the air blowing pipe in Example 5.

[0028] Explanation of reference numerals in the attached drawings: 1. Bottom mold; 11. Support part; 111. Insertion pin; 112. Positioning pin; 113. First shaping groove; 114. Cooling channel; 12. Side part; 121. Second shaping groove; 122. Mounting groove; 13. Injection channel; 131. Vent hole; 14. Shaping plate; 15. Positioning block; 151. Through groove; 16. Groove; 161. Rotating shaft; 2. Cover mold; 21. Positioning rod; 211. Abutment block; 212. Pushing block; 3. Sliding strip; 31. Sliding rod; 32. Connecting sleeve; 33. 1. Connecting channel; 4. Injection head; 5. Drive assembly; 51. Drive bar; 52. Drive screw; 53. Drive disc; 531. Arc rack; 532. First limiting arc surface; 533. Limiting disc; 54. Driven disc; 541. Circular gear ring; 542. Limiting frame; 543. Second limiting arc surface; 55. Drive motor; 56. Rotating motor; 6. Air blowing pipe; 61. Air blowing hole; 62. Opening and closing ring; 63. Return spring; 7. Bottle cap; 71. Cap cap; 711. Insertion hole; 712. Positioning hole; 72. Cap brim. Detailed Implementation

[0029] The following combination Figures 2-11 This application will be described in further detail.

[0030] Example 1: This application discloses a secondary molding die.

[0031] Reference Figure 2 , Figure 3 The secondary forming mold includes a bottom mold 1 and a top mold 2. The bottom mold 1 includes a support part 11 and two side parts 12. The two side parts 12 are symmetrically distributed on both sides of the support part 11. The support part 11 and the side parts 12 can be integrally formed or assembled by bolt connection to form the bottom mold 1.

[0032] In this embodiment, the cap 71 of the bottle cap 7 has a positioning hole 712 on its side wall, which is located on one side of the insertion hole 711 of the cap 71. Insertion pins 111 and positioning pins 112 are fixedly installed on the upper surface of the support 11. The insertion pin 111 is used to match and be inserted into the insertion hole 711, and the positioning pin 112 is used to match and be inserted into the positioning hole 712. The formed cap 71 is initially placed on the support 11 through the insertion and engagement of the insertion pins 111 and the positioning pins 112.

[0033] Reference Figure 2 , Figure 3 , Figure 4 The support portion 11 has a plurality of first shaping grooves 113 on the side wall near the side portion 12, and the plurality of first shaping grooves 113 are arranged at intervals along the length direction of the support portion 11; the side portion 12 has a plurality of second shaping grooves 121 on the side wall near the support portion 11, and the plurality of second shaping grooves 121 are correspondingly arranged with the plurality of first shaping grooves 113, and an injection channel 13 is formed between each first shaping groove 113 and the corresponding second shaping groove 121.

[0034] The cover mold 2 covers the injection channel 13 and abuts against the surface of the cap 71 away from the insertion hole 711. The cover mold 2 can be raised and lowered by a cylinder (not shown in the figure) to open and close the injection channel 13. In this embodiment, the cover mold 2 is equipped with an injection head 4, which is used to inject molten plastic material into the injection channel 13. The injection head 4 is connected to a conveying pipe for conveying the plastic material. The conveying pipe is a flexible hose, and the inlet end of the conveying pipe is used to connect to equipment such as an injection molding machine. The cover mold 2 has an vent hole communicating with the injection channel 13 (the vent hole is not shown in this embodiment).

[0035] The implementation principle of Embodiment 1 of this application is as follows: By setting multiple first shaping grooves 113 and multiple second shaping grooves 121, multiple injection channels 13 are formed, which can simultaneously inject the cap brims 72 of multiple caps 71, improving work efficiency. During injection molding, the molded cap 71 is placed on the support part 11, so that the insertion pins 111 of the support part 11 are inserted into the insertion holes 711 and the positioning pins 112 are inserted into the positioning holes 712. By using the cooperation of the insertion pins 111 and the positioning pins 112, the position of the cap 71 is positioned, avoiding the possibility of the cap 71 shifting position when placed into the secondary molding mold cavity or during the injection process. After the cap 71 is installed, the cover mold 2 is closed onto the injection channel 13 of the bottom mold 1, so that the cover mold 2 abuts against the cap 71, strengthening the fixing effect of the cap 71, thereby improving the molding quality of the bottle cap 7 product.

[0036] Example 2: This application discloses a secondary molding mold.

[0037] The difference between the secondary molding die disclosed in this application and that in Example 1 is as follows: Reference Figure 5 , Figure 6 In this embodiment, a sliding strip 3 is slidably installed inside the injection channel 13, and an injection head 4 is installed on the sliding strip 3. The injection head 4 faces the area between the cover mold 2 and the sliding strip 3, and the vent 131 is located on the side of the injection channel 13 away from the cover mold 2. The bottom mold 1 is provided with a driving assembly 5 for driving the sliding strip 3 to slide. During injection molding, the driving assembly 5 drives the sliding strip 3 to slide from the side of the injection channel 13 near the cover mold 2 to the side of the injection channel 13 away from the cover mold 2. During demolding, the driving assembly 5 drives the sliding strip 3 to slide from the side of the injection channel 13 away from the cover mold 2 to the side of the injection channel 13 near the cover mold 2 to eject the bottle cap 7.

[0038] The bottom wall of the bottom mold 1 has a groove 16. The drive assembly 5 includes a drive bar 51, a drive screw 52, ​​and a drive component. The drive bar 51 is slidably installed in the groove 16. A sliding bar 3 is connected to a sliding rod 31. One end of the sliding rod 31 is fixedly connected to the bottom wall of the sliding bar 3, and the other end extends out of the injection channel 13 and is fixedly connected to the drive bar 51. The drive screw 52 is vertically arranged and rotatably installed in the groove 16. The drive screw 52 passes through the drive bar 51 and is threadedly connected to the drive bar 51.

[0039] A driving component is disposed on the bottom mold 1 to drive the drive screw 52 to rotate. In this embodiment, the driving component is a rotary motor 56, which is fixedly installed in the groove 16. The output shaft of the rotary motor 56 is coaxially connected to the drive screw 52. It should also be noted that the rotary motor 56 is a stepper motor to realize the forward and reverse rotation of the drive screw 52, ​​thereby realizing the lifting and lowering of the sliding bar 3.

[0040] The implementation principle of Embodiment 2 of this application is as follows: The injection head 4 is set on the sliding strip 3. Before injection, the sliding strip 3 moves to the side of the injection channel 13 near the cover mold 2, and the cover mold 2 is closed onto the bottom mold 1. Then, molten plastic raw material is injected into the area between the sliding strip 3 and the cover mold 2 through the injection head 4. During this process, the sliding strip 3 is driven to gradually slide away from the cover mold 2, so that the raw material gradually fills the entire injection channel 13. When the sliding strip 3 moves to the side of the injection channel 13 away from the cover mold 2, it finally cools and forms the cap 72. By using the sliding strip 3 to drive the injection head 4 to slide, the effect of simultaneous injection and venting is achieved, reducing the air mixed in the injection channel 13 and improving the molding quality of the bottle cap 7.

[0041] Example 3: This application discloses a secondary molding die.

[0042] The difference between the secondary molding die disclosed in this application and that in embodiment 2 is as follows: Reference Figure 7 , Figure 8In this embodiment, the driving component includes a driving disk 53, a driven disk 54, and a drive motor 55. A rotating shaft 161 is rotatably mounted in the groove 16, and the rotating shaft 161 is arranged parallel to the drive screw 52. The driving disk 53 is coaxially fixed to the outer peripheral wall of one end of the rotating shaft 161. The driven disk 54 is disposed in the groove 16 and coaxially fixed to the outer peripheral wall of the drive screw 52. An arc-shaped rack 531 is fixedly mounted on the outer peripheral wall of the driving disk 53, and a circular gear ring 541 is provided on the outer peripheral wall of the driven disk 54. The arc-shaped rack 531 and the circular gear ring 541 mesh and transmit power.

[0043] The drive motor 55 is fixedly installed in the groove 16, and the output shaft of the drive motor 55 is coaxially connected to the rotating shaft 161. In this embodiment, the drive motor 55 has the same structure as the rotating motor 56 in embodiment 2, both of which are stepper motors.

[0044] A limiting plate 533 is fixedly mounted on the surface of the driving plate 53. The outer peripheral wall of the limiting plate 533 forms a first limiting arc surface 532. A limiting frame 542 is fixedly mounted on the surface of the driven plate 54. The limiting frame 542 forms multiple second limiting arc surfaces 543, which are arranged at intervals around the central axis of the driving screw 52. When the arc-shaped rack 531 disengages from the circular gear ring 541, the first limiting arc surface 532 abuts against the second limiting arc surface 543 to restrict the free rotation of the driven plate 54. When the arc-shaped rack 531 engages with the circular gear ring 541, the first limiting arc surface 532 disengages from the second limiting arc surface 543.

[0045] The implementation principle of Embodiment 3 of this application is as follows: During injection molding, the drive motor 55 drives the active disk 53 to rotate continuously. Under the meshing of the arc-shaped rack 531 and the circular gear ring 541, the driven disk 54 rotates intermittently, that is, the sliding strip 3 slides intermittently away from the mold cover 2. The effect is that during the process of the arc-shaped rack 531 disengaging from the circular gear ring 541, the sliding strip 3 is in a stopped state, while the injection head 4 continuously injects raw material into the area between the sliding strip 3 and the mold cover 2, thereby making the raw material between the sliding strip 3 and the mold cover 2 more compact. As the active disk 53 continues to rotate, the sliding strip 3 repeatedly pauses during its movement away from the mold cover 2, thereby repeatedly pressurizing and compacting the raw material in the injection channel 13, improving the injection molding quality.

[0046] Example 4: This application discloses a secondary molding die.

[0047] The difference between the secondary molding die disclosed in this application and that in embodiment 2 is as follows: Reference Figure 9 , Figure 10In this embodiment, a mounting groove 122 is provided on the side wall of the side portion 12 near the support portion 11, and a shaping plate 14 is installed in the groove. The second shaping groove 121 is located on the side wall of the shaping plate 14 near the support portion 11. A rotating rod is fixedly installed on the side of the shaping plate 14 near the cover mold 2. The rotating rod is rotatably mounted on the inner wall of the mounting groove 122, and the shaping plate 14 is hinged to the inner wall of the mounting groove 122 through the rotating rod.

[0048] A positioning rod 21 is fixedly connected to the cover mold 2, with one end of the positioning rod 21 away from the cover mold 2 passing through the mounting groove 122. A positioning block 15 is fixedly installed on the surface of the shaping plate 14 away from the support part 11, and the positioning block 15 has a through groove 151 for the positioning rod 21 to pass through. An abutment block 211 is fixedly installed on the peripheral wall of the positioning rod 21. When the cover mold 2 closes to the bottom mold 1, the abutment block 211 abuts against the through groove 151 of the positioning block 15, forcing the surface of the shaping plate 14 to rotate to a vertical state, thereby restricting the free rotation of the shaping plate 14.

[0049] The positioning rod 21 is provided with a pusher for pushing the shaping plate 14 to flip. The pusher is configured as a pusher block 212. The pusher block 212 is fixedly installed on the outer peripheral wall of the positioning rod 21, and the pusher block 212 is located on the side of the abutment block 211 away from the cover mold 2. When the cover mold 2 is lifted away from the bottom mold 1, the pusher block 212 pushes the shaping plate 14 through the through groove 151 of the positioning block 15, and forces the side of the shaping plate 14 away from the cover plate to flip towards the side away from the support part 11, so that the shaping plate 14 peels off the formed bottle cap 7 brim 72.

[0050] The implementation principle of Embodiment 4 of this application is as follows: When the cover mold 2 is closed on the bottom mold 1, the positioning rod 21 passes through the through groove 151 of the positioning block 15, and the abutment block 211 abuts against the inner wall of the through groove 151, restricting the free rotation of the shaping plate 14, so as to inject molten raw material into the injection channel 13. After the cap 72 is formed, it is lifted away from the cover mold 2, so that the abutment block 211 is disengaged from the through groove 151. At this time, the pushing block 212 pushes against the inner wall of the through groove 151, thereby causing the shaping plate 14 to flip away from the support part 11, so as to peel off the surface of the cap 72, reduce the demolding resistance of the bottle cap 7, and improve the operational convenience of the overall structure.

[0051] Example 5: This application discloses a secondary molding die.

[0052] The difference between the secondary molding die disclosed in this application and that in embodiment 2 is as follows: Reference Figure 11 In this embodiment, the bottom mold 1 is connected to an air blowing pipe 6, one end of which extends into the injection channel 13, and the air blowing pipe 6 is located on the side of the injection channel 13 away from the cover mold 2; a cooling channel 114 is provided in the support part 11, one end of which is connected to the injection channel 13, and the other end penetrates the inner wall of the groove 16.

[0053] A connecting sleeve 32 is fixedly installed on the side wall of the sliding strip 3 away from the cover mold 2. A connecting channel 33 is opened in the sliding strip 3, and the connecting channel 33 connects to the inside of the connecting sleeve 32. When the sliding strip 3 slides to the side of the injection channel 13 away from the cover mold 2, the connecting channel 33 connects to the cooling channel 114 and the connecting sleeve 32 is fitted onto the air blowing pipe 6.

[0054] Multiple air holes 61 are provided on the outer peripheral wall of the air blowing pipe 6. The multiple air holes 61 are arranged at intervals around the central axis of the air blowing pipe 6. An opening and closing ring 62 is slidably sleeved on the outer peripheral wall of the air blowing pipe 6. A return spring 63 is provided between the opening and closing ring 62 and the air blowing pipe 6. One end of the return spring 63 is fixedly connected to the opening and closing ring 62, and the other end is fixedly connected to the inner wall of the injection channel 13. Under normal conditions, the return spring 63 forces the opening and closing ring 62 to close all the air holes 61.

[0055] The inner diameter of the mating sleeve 32 is larger than the outer diameter of the air blowing pipe 6. When the sliding bar 3 slides to the side of the injection channel 13 away from the cover mold 2, the mating sleeve 32 pushes the opening and closing ring 62 to open all the air blowing holes 61, so that all the air blowing holes 61 are connected to the connecting channel 33. It should be noted that, in order to improve the cooling effect of the raw material in the injection channel 13, the cooling channel 114 can be arranged in a serpentine pattern in the support part 11, thereby increasing the heat exchange area.

[0056] The implementation principle of Embodiment 5 of this application is as follows: After the sliding bar 3 slides to the side of the injection channel 13 away from the cover mold 2, the injection channel 13 is filled with raw material. Cooling gas is blown into the connecting channel 33 by the air blowing pipe 6. The cooling gas enters the cooling channel 114 through the connecting channel 33, carrying away heat and improving cooling efficiency. Under normal conditions, the opening and closing ring 62 closes all the air blowing holes 61 under the action of the return spring 63. When the sliding bar 3 slides to the side of the injection channel 13 away from the cover mold 2, the mating sleeve 32 pushes the opening and closing ring 62 to slide, thereby opening all the air blowing holes 61 to cool the raw material in the injection channel 13 and improve the overall ease of operation.

[0057] Example 6: This application also discloses a secondary molding method.

[0058] The secondary molding method specifically includes the following steps: S1. Placement of cap 71: Place the formed cap 71 into the bottom mold 1, so that the insertion pin 111 of the support part 11 is inserted into the insertion hole 711 of the cap 71, and the positioning pin 112 is inserted into the positioning hole 712 of the cap 71.

[0059] S2. Mold closing: Cover the bottom mold 1 with the top mold 2, so that the bottom mold 1 and the top mold 2 surround and form the injection channel 13, and fix the cap 71 by abutment.

[0060] S3, Injection Molding: Inject molten raw material into injection channel 13.

[0061] S4, Cooling and Mold Opening.

[0062] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A secondary forming mold, characterized in that: The system includes a bottom mold (1) and a top mold (2). The bottom mold (1) includes a support part (11) and two side parts (12), which are symmetrically distributed on both sides of the support part (11). The side wall of the cap (71) is provided with a positioning hole (712), which is located on one side of the insertion hole (711). The surface of the support part (11) is provided with an insertion post (111) for inserting into the insertion hole (711) and a positioning post (112) for inserting into the positioning hole (712). The side wall of the support part (11) near the side part (12) is provided with a first shaping groove (113), and the side wall of the side part (12) near the support part (11) is provided with a second shaping groove (121). The first shaping groove (113) and the second shaping groove (121) are provided with a first shaping groove (113) and a second shaping groove (121). An injection channel (13) is formed between 121), and the cover mold (2) covers the injection channel (13) and abuts against the surface of the cap (71) away from the insertion hole (711); a sliding strip (3) is slidably installed in the injection channel (13), and the sliding strip (3) is connected to an injection head (4) facing the cover mold (2). An exhaust hole (131) is opened on the side of the injection channel (13) away from the cover mold (2); the bottom mold (1) is provided with a drive assembly (5) for driving the sliding strip (3) to slide. During injection, the drive assembly (5) drives the sliding strip (3) to slide from the side of the injection channel (13) close to the cover mold (2) to the side of the injection channel (13) away from the cover mold (2); the drive assembly (5) includes a drive strip (51) and a drive screw (52) to... The driving component includes a driving bar (51) slidably mounted on the bottom mold (1) away from the cover mold (2), a sliding bar (3) connected to a sliding rod (31), one end of the sliding rod (31) extending out of the injection channel (13) and connected to the driving bar (51); a driving screw (52) rotatably mounted on the bottom mold (1) and threaded through the driving bar (51); and a driving component set on the bottom mold (1) to drive the driving screw (52) to rotate. The driving component includes a driving disc (53), a driven disc (54), and a driving motor (55). The driving disc (53) rotatably mounted on the bottom mold (1), and the driven disc (54) coaxially mounted on the driving screw (52). The outer peripheral wall of the driving disc (53) is provided with an arc-shaped rack (531), and the outer peripheral wall of the driven disc (54) is provided with an arc-shaped rack (531). A circular gear ring (541) and an arc-shaped rack (531) mesh with each other for transmission; a drive motor (55) is mounted on the bottom mold (1), and the output shaft of the drive motor (55) is coaxially connected to the drive disc (53); the drive disc (53) has a first limiting arc surface (532), and the driven disc (54) is provided with a limiting frame (542), the limiting frame (542) has a second limiting arc surface (543). When the arc-shaped rack (531) disengages from the circular gear ring (541), the first limiting arc surface (532) and the second limiting arc surface (543) abut against each other to restrict the rotation of the driven disc (54); when the arc-shaped rack (531) meshes with the circular gear ring (541), the first limiting arc surface (532) disengages from the second limiting arc surface (543).

2. The secondary forming mold according to claim 1, characterized in that: The side portion (12) near the support portion (11) has an installation groove (122) and a shaping plate (14) is provided in the installation groove (122). A second shaping groove (121) is provided on the side wall of the shaping plate (14) near the support portion (11). The side of the shaping plate (14) near the cover mold (2) is hinged to the inner wall of the installation groove (122). The cover mold (2) is connected to a positioning rod (21). One end of the positioning rod (21) is inserted into the installation groove (122). The surface of the shaping plate (14) away from the support portion (11) is provided with a positioning block (15). The positioning block (15) has a through groove (151) for the positioning rod (21) to pass through. The positioning rod (21) is provided with a pusher for pushing the shaping plate (14) to flip.

3. The secondary forming mold according to claim 2, characterized in that: The positioning rod (21) has an abutment block (211) on its peripheral wall. When the cover mold (2) is closed on the bottom mold (1), the abutment block (211) abuts against the through groove (151) of the positioning block (15) to restrict the free rotation of the shaping plate (14). The pushing member includes a pushing block (212) disposed on the positioning rod (21). The pushing block (212) is located on the side of the abutment block (211) away from the cover mold (2). When the cover mold (2) is lifted away from the bottom mold (1), the pushing block (212) pushes the shaping plate (14) through the positioning block (15) and forces the side of the shaping plate (14) away from the cover mold (2) to flip away from the support part (11).

4. The secondary forming mold according to claim 1, characterized in that: An air blowing pipe (6) is connected inside the injection channel (13). The air blowing pipe (6) is located on the side of the injection channel (13) away from the cover mold (2). A cooling channel (114) is opened inside the support part (11). One end of the cooling channel (114) is connected to the injection channel (13). A docking sleeve (32) is provided on the side wall of the sliding bar (3) away from the cover mold (2). A connecting channel (33) is opened inside the sliding bar (3). The connecting channel (33) is connected to the inside of the docking sleeve (32). When the sliding bar (3) slides to the side of the injection channel (13) away from the cover mold (2), the connecting channel (33) is connected to the cooling channel (114) and the docking sleeve (32) is fitted onto the air blowing pipe (6).

5. The secondary forming mold according to claim 4, characterized in that: The outer peripheral wall of the air blowing pipe (6) is provided with multiple air blowing holes (61). The outer peripheral wall of the air blowing pipe (6) is fitted with an opening and closing ring (62). A return spring (63) is provided between the opening and closing ring (62) and the air blowing pipe (6). The return spring (63) forces the opening and closing ring (62) to close all the air blowing holes (61). The inner diameter of the docking sleeve (32) is larger than the outer diameter of the air blowing pipe (6). When the sliding bar (3) slides to the side of the injection channel (13) away from the cover mold (2), the docking sleeve (32) pushes the opening and closing ring (62) to open all the air blowing holes (61).

6. A secondary molding method, based on the secondary molding mold according to any one of claims 1-5, comprising the following steps: S1. Placement of cap (71): Place the formed cap (71) into the bottom mold (1); S2, Mold closing: Close the cover mold (2) onto the bottom mold (1); S3, Injection Molding: Injecting molten raw material into the injection channel (13); S4, Cooling and Mold Opening.

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