A dual cavity forming die

Abstract

The application relates to a double-cavity forming die, belonging to the technical field of die, which comprises an upper die, one side of the upper die being provided with an upper cavity; a lower die, the lower die being located on one side of the upper die close to the upper cavity, one side of the lower die close to the upper die being provided with a lower cavity; a middle die, the middle die being located between the upper die and the lower die, one side of the middle die close to the upper die being provided with a first middle cavity opposite to the upper cavity, one side of the middle die close to the lower die being provided with a second middle cavity opposite to the lower cavity, the first middle cavity and the upper cavity forming a first die cavity, and the second middle cavity and the lower cavity forming a second die cavity. The application has the effect of improving the production efficiency of products.

Description

Technical Field

[0001] This application relates to the field of mold technology, and in particular to a dual-cavity molding mold. Background Technology

[0002] Molds are various shapes and tools used in industrial production to obtain desired products through methods such as injection molding, blow molding, extrusion, die casting, forging, smelting, and stamping. In short, a mold is a tool used to create shaped objects; this tool is composed of various parts, and different molds are composed of different parts. It mainly achieves the shaping of objects by changing the physical state of the material being molded. It is often referred to as the "mother of industry."

[0003] In everyday life, molds are generally single-layer molds, which can only process one type of plastic part at a time, resulting in low processing efficiency. In contrast, double-layer molds can process two different molds simultaneously, significantly improving production efficiency and allowing for the simultaneous processing of different parts. A double-layer mold includes an upper feed nozzle, a mounting plate, an upper mold plate, a middle mold plate, a lower mold plate, and a lower mounting plate. The feed nozzle is mounted on the mounting plate. A first cavity exists between the upper and middle mold plates, and a second cavity exists between the middle and lower mold plates. Gears are installed on the sidewalls of the middle mold plate, a first rack is installed on the sidewalls of the upper mold plate, and a second rack is installed on the sidewalls of the lower mold plate. The first rack and gear mesh with each other, and the second rack and gear mesh with each other as well. When the mold is being separated, the lower mounting plate moves the lower mold plate away from the middle mold. Because the second rack and the gear mesh with each other, the second rack drives the gear to rotate. At this time, the gear drives the first rack to move, and the first gear drives the middle mold plate away from the upper mold plate, thereby separating the cavity between the upper mold plate and the middle mold plate, so that the product falls out of the cavity.

[0004] Regarding the aforementioned technologies, the inventors believe that when the molten material is injected from the injection port, since the first cavity is located above the second cavity, the time for the molten material to be injected into the first cavity is shorter than that for the second cavity. This results in the molding speed of the product in the first cavity being faster than that in the second cavity. Furthermore, since the first and second cavities are opened simultaneously, the product in the first cavity must wait for the product in the second cavity to cool down before the mold can be opened, thus reducing the production speed of the product. Summary of the Invention

[0005] In order to improve the production efficiency of products, this application provides a dual-cavity molding die.

[0006] The dual-cavity molding die provided in this application adopts the following technical solution:

[0007] A dual-cavity molding die includes an upper mold, wherein an upper cavity is formed on one side of the upper mold;

[0008] The lower mold is located on the side of the upper mold near the upper cavity, and the lower mold has a lower cavity on the side of the upper mold near the upper mold;

[0009] A middle mold is located between the upper mold and the lower mold. The middle mold has a first middle cavity opposite to the upper cavity on the side closer to the upper mold, and a second middle cavity opposite to the lower cavity on the side closer to the lower mold. The first middle cavity and the upper cavity form a first mold cavity, and the second middle cavity and the lower cavity form a second mold cavity.

[0010] The mold opening assembly comprises two sets, which are located on both sides of the middle mold. Each mold opening assembly includes a gear, a first rack, and a second rack. The gear is located on one side of the middle mold. The first rack is located on the side wall of the upper mold and meshes with the gear. The side wall of the middle mold has a first guide groove for the first rack to pass through. The second rack is located on the side wall of the lower mold and meshes with the gear. The side wall of the lower mold has a second guide groove for the second rack to pass through. The outer side wall of the rack has a notch. When the upper mold, middle mold, and lower mold are in the closed state, the notch faces the second rack.

[0011] The second rack has a fixing groove on the side near the gear. A fixing block is slidably disposed in the fixing groove. A spring is disposed between the fixing block and the bottom of the fixing groove. The middle mold has a positioning groove on the side wall of the second guide groove, which is opposite to the fixing groove. The spring presses the fixing block into the positioning groove. A connecting strip is disposed on the side wall of the fixing block. The second rack has a connecting groove on the side wall of the fixing groove for the connecting strip to pass through. A pressing block is disposed on the side wall of the connecting strip. The pressing block and the fixing block are disposed on the same side facing the connecting strip. The second rack has a pressing groove on the groove wall of the connecting groove for the pressing block to pass through. The pressing block protrudes from the pressing groove.

[0012] By adopting the above technical solution, after the product is formed in the first and second mold cavities, the injection molding machine drives the lower mold to move away from the middle mold. Because the fixing block is inserted into the positioning groove, the middle mold and the lower mold cannot be opened. The lower mold drives the middle mold to move away from the upper mold. The first mold cavity between the upper mold and the middle mold gradually opens. The gear rotates under the drive of the first rack. When the notch of the gear passes through the pressing block and the teeth of the gear abut against the pressing block, the pressing block drives the connecting block to move to the bottom of the connecting groove. The connecting block drives the fixing block to disengage from the positioning groove. At this time, the fixing block does not limit the middle mold. The gear drives the middle mold to move to the side of the upper mold under the drive of the first rack, so that the second mold cavity between the middle mold and the lower mold opens. The product can be taken out from the second mold cavity. The product in the first mold cavity can be directly opened and taken out after it has cooled and formed. After the product in the first mold cavity is taken out, the product in the second mold cavity has also cooled and formed and can be opened and taken out. There is no need to wait for the product in the second mold cavity to cool down before opening the mold, which saves time and costs. This improves the production efficiency of the product.

[0013] Optionally, the assembly further includes a first ejection assembly for ejecting the product from the first mold cavity and a second ejection assembly for ejecting the product from the second mold cavity; the first ejection assembly includes a first top plate and a plurality of first ejector pins, the first top plate is mounted on the side of the upper mold away from the middle mold, the plurality of first ejector pins are mounted on the first top plate, the first ejector pins are positioned facing the upper mold, the upper mold has a first ejector pin hole for the first ejector pin to pass through, the first ejector pin hole is interconnected with the upper cavity; the second ejection assembly includes a second top plate and a plurality of second ejector pins, the second top plate is mounted on the side of the lower mold away from the middle mold, the plurality of second ejector pins are mounted on the second top plate, the second ejector pins are positioned facing the lower mold, the lower mold has a second ejector pin hole for the second ejector pin to pass through, the second ejector pin hole is interconnected with the lower cavity; the side wall of the middle mold is provided with a first connecting post, the first connecting post is positioned towards the first top plate, and the first connecting post penetrates the first top plate.

[0014] By adopting the above technical solution, when it is necessary to eject the product, the first ejector plate / second ejector plate can be ejected towards the upper mold / lower mold. The first ejector plate / second ejector plate drives multiple first ejector rods / second ejector rods to eject towards the product at the same time, thereby facilitating the ejection of the product.

[0015] Optionally, a first connecting block is provided at one end of the first connecting post that passes through the first top plate; a second connecting post is provided on the side wall of the middle mold, the second connecting post is positioned toward the second top plate, the second connecting post penetrates the second top plate, and a second connecting block is provided at one end of the second connecting post that passes through the second top plate.

[0016] By adopting the above technical solution, when the middle mold and the upper mold open, the middle mold moves away from the upper mold. The middle mold drives the first connecting pillar to move away from the upper mold. The first connecting block on the first connecting pillar abuts against the first top plate, thereby driving the first top plate to move towards the upper mold. The first top plate drives multiple first ejector pins to move towards the product, and the multiple first ejector pins simultaneously eject the product from the upper cavity. When the middle mold and the lower mold open, the middle mold moves away from the lower mold. The middle mold drives the second connecting pillar to move away from the lower mold. The second connecting block on the second connecting pillar abuts against the second top plate, thereby driving the second top plate to move towards the lower mold. The second top plate drives multiple second ejector pins to move towards the product, and the multiple second ejector pins simultaneously eject the product from the lower cavity. The product can be ejected from the upper cavity / lower cavity when the middle mold and the upper mold open / when the middle mold and the lower mold open, without the need for other driving sources, which facilitates the ejection of the product.

[0017] Optionally, there is a gap between the first connecting block and the first top plate, and a gap between the second connecting block and the second top plate.

[0018] By adopting the above technical solution, if the first connecting block directly drives the first top plate to move towards the upper mold when the upper mold and the middle mold open, multiple first ejector pins will directly push the product against the side wall of the first cavity, causing damage to the product surface. By setting a gap between the first connecting block and the first top plate, when the mold opens to a certain extent, the first connecting block abuts against the first top plate as the middle mold moves, thereby driving the first top plate to move, thus reducing the risk of product damage. By setting a gap between the second connecting block and the second top plate, when the lower mold and the middle mold open to a certain extent, the second connecting block abuts against the second top plate as the middle mold moves, thereby driving the second top plate to move, thus reducing the risk of product damage.

[0019] Optionally, the first connecting block is threaded onto the first connecting post, and the second connecting block is threaded onto the second connecting post.

[0020] By adopting the above technical solution, the first connecting block is threaded onto the first connecting post, and the gap between the first connecting block and the first top plate can be adjusted by rotating the first connecting block, thereby controlling the distance of the product ejected by the first ejector rod and reducing the risk of product damage. Similarly, by threading the second connecting block onto the second connecting post, the gap between the second connecting block and the second top plate can be adjusted by rotating the second connecting block, thereby controlling the distance of the product ejected by the second ejector rod and reducing the risk of product damage.

[0021] Optionally, the first connecting post is provided with a first abutting block, which abuts against the side of the first top plate near the upper mold, and the second connecting post is provided with a second abutting block, which abuts against the side of the second top plate near the lower mold.

[0022] By adopting the above technical solution, when the upper mold and the middle mold are closed, the middle mold moves towards the upper mold, and the first abutting block moves with the movement of the first connecting post. The first abutting block abuts against the first top plate, and the first abutting block drives the first top plate to move away from the upper mold until the first ejector pin retracts into the first ejector pin hole, which facilitates the reset of the first ejector pin. When the lower mold and the middle mold are closed, the middle mold moves towards the lower mold, and the second abutting block moves with the movement of the second connecting post. The second abutting block abuts against the second top plate, and the second abutting block drives the second top plate to move away from the lower mold until the second ejector pin retracts into the second ejector pin hole, which facilitates the reset of the second ejector pin.

[0023] Optionally, the middle mold sidewall is provided with a mounting block, and the first connecting column and the second connecting column are both mounted on the mounting block. A first compression spring is coaxially sleeved on the outer periphery of the first connecting column, one end of the first compression spring abuts against the mounting block, and the other end of the first compression spring abuts against the first top plate. A second compression spring is coaxially sleeved on the outer periphery of the second connecting column, one end of the second compression spring abuts against the mounting block, and the other end of the second compression spring abuts against the second top plate.

[0024] By adopting the above technical solution, when the upper mold and the middle mold are closed, the middle mold moves towards the side closer to the upper mold, and the first compression spring always presses the first ejector plate away from the upper mold, thereby facilitating the reset of the first ejector pin. When the lower mold and the middle mold are closed, the middle mold moves towards the side closer to the lower mold, and the second compression spring always presses the second ejector plate away from the lower mold, thereby facilitating the reset of the second ejector pin.

[0025] Optionally, it also includes a guide assembly, which includes a first guide rail, a first guide bar, a second guide rail, and a second guide bar. The first guide rail and the second guide rail are both installed on the side wall of the middle mold and are located on both sides of the gear. The first guide bar is installed on the side wall of the upper mold and passes vertically through the first guide rail. The second guide bar is installed on the side wall of the lower mold and passes vertically through the second guide rail.

[0026] By adopting the above technical solution, when the upper mold and the middle mold open, the middle mold moves away from the upper mold. Since the first guide rail is installed on the middle mold and the first guide strip is installed on the side wall of the upper mold, and the first guide strip passes through the first guide rail, the first guide rail and the first guide strip guide the middle mold, thus making the mold opening between the upper mold and the middle mold more stable. When the middle mold and the lower mold open, the middle mold moves away from the lower mold. Since the second guide rail is installed on the middle mold and the second guide strip is installed on the side wall of the lower mold, and the second guide strip passes through the second guide rail, the second guide rail and the second guide strip guide the middle mold, thus making the mold opening between the lower mold and the middle mold more stable.

[0027] Optionally, the upper mold has an upper mounting groove on the side near the middle mold, and an upper mold core is installed in the upper mounting groove. The upper cavity is located on the upper mold core. The middle mold has a first insert groove on the side near the upper mold, and a first middle mold core is installed in the first insert groove. The first middle cavity is located on the first middle mold core. The lower mold has a lower mounting groove on the side near the middle mold, and a lower mold core is installed in the lower mounting groove. The lower cavity is located on the lower mold core. The middle mold has a second insert groove on the side near the lower mold, and a second middle mold core is installed in the second insert groove. The second middle cavity is located within the second middle mold core.

[0028] By adopting the above technical solution, when the upper cavity, the first intermediate cavity, the second intermediate cavity, and the lower cavity are damaged, the upper mold core, the first intermediate mold core, the second intermediate mold core, or the lower mold core can be removed for repair, which facilitates the repair of the upper cavity, the first intermediate cavity, the second intermediate cavity, and the lower cavity. Alternatively, the upper mold core, the first intermediate mold core, the second intermediate mold core, and the lower mold core can be directly replaced, saving costs.

[0029] Optionally, the upper mold has two first pads on the side away from the middle mold, the two first pads are located on both sides of the first top plate, and a feeding plate is provided on the side of the two first pads away from the upper mold, and a first fixing plate is provided on the side of the feeding plate away from the upper mold; the lower mold has two second pads on the side away from the middle mold, the two second pads are located on both sides of the second top plate, and a second fixing plate is provided on the side of the two second pads away from the upper mold.

[0030] By adopting the above technical solution, the upper mold can be fixed to the injection molding machine by setting the first fixing plate, and the lower mold can be fixed to the injection molding machine by setting the second fixing plate. By setting the first pad, the height between the feed plate and the upper mold is increased, allowing the first top plate to slide between the feed plate and the upper mold. By setting the second pad, the height between the second fixing plate and the lower mold is increased, allowing the second top plate to slide between the second fixing plate and the lower mold.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. A dual-cavity molding die, by setting an upper mold, a middle mold, a lower mold, and a mold opening assembly, allows the product in the first cavity to cool and solidify first, and then be directly opened and removed. After the product in the first cavity is removed, the product in the second cavity has also cooled and solidified, and can be opened and removed, eliminating the need to remove the product in the second cavity first and then the product in the first cavity, thus saving time and improving production efficiency.

[0033] 2. A dual-cavity molding die, by setting a first connecting pillar, a second connecting pillar, a first connecting block, and a second connecting block, allows the product to be ejected from the upper cavity / lower cavity when the middle mold and upper mold open, or when the middle mold and lower mold open, thus facilitating product ejection;

[0034] 3. A dual-cavity molding die facilitates the resetting of the second ejector pin by setting a first abutment block and a second abutment block. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a dual-cavity molding die.

[0036] Figure 2 This is a schematic diagram of the feed plate.

[0037] Figure 3 This is a structural diagram of the upper mold, middle mold, and lower mold.

[0038] Figure 4 This is an exploded structural diagram of a dual-cavity molding die.

[0039] Figure 5 This is a structural schematic diagram of a dual-cavity molding die from a second perspective.

[0040] Figure 6 This is a schematic diagram of the exploded structure between the second rack and the gear.

[0041] Figure 7 This is a schematic diagram of the exploded structure between the intermediate mold, the second rack, and the gear.

[0042] Figure 8 This is a third-view structural diagram of a dual-cavity molding die.

[0043] Figure 9 This is a structural schematic diagram of a dual-cavity molding die from a fourth perspective.

[0044] Figure 10 This is a schematic diagram of another implementation of a dual-cavity molding die.

[0045] Explanation of reference numerals in the attached drawings: 1. First fixing plate; 2. Feeding plate; 3. First pad block; 4. Upper mold; 5. Middle mold; 6. Lower mold; 7. Second pad block; 8. Second fixing plate; 21. Square groove; 211. Material distribution plate; 41. Upper mounting groove; 411. Upper mold core; 51. First insert groove; 511. First middle mold core; 4111. Upper cavity; 5111. First middle cavity; 61. Lower mounting groove; 611. Lower mold core; 52. Second insert groove 521, Second intermediate mold core; 6111, Lower cavity; 5211, Second intermediate cavity; 11, Feed nozzle; 2111, Receptacle; 111, Feed pipe; 2112, First distribution pipe; 2113, Second distribution pipe; 9, Mold opening assembly; 91, First rack; 92, Second rack; 93, Gear; 53, Insert groove; 42, First insert groove; 54, First guide groove; 62, Second insert groove; 55, Second guide groove; 921 1. Fixing groove; 9212. Pressing groove; 92131. Fixing block; 9214. Spring; 56. Positioning groove; 9213. Connecting strip; 921. Connecting groove; 92132. Pressing block; 9215. Fixing plate; 101. Guide assembly; 1011. First guide rail; 1012. First guide bar; 1013. Second guide rail; 1014. Second guide bar; 102. First ejection assembly; 103. Second ejection assembly; 1021. First top plate; 1022. Third top plate; 1031. Second top plate; 1032. Fourth top plate; 104. Ejection drive assembly; 1041. Mounting block; 1042. First connecting post; 1043. Second connecting post; 1044. First connecting block; 1045. Second connecting block; 1046. First abutment block; 1047. Second abutment block; 1048. First compression spring; 1049. Second compression spring. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0047] This application discloses a dual-cavity molding die.

[0048] Reference Figure 1 The dual-cavity molding die includes a first fixed plate 1, a feeding plate 2, a first pad block 3, an upper mold 4, a middle mold 5, a lower mold 6, a second pad block 7, and a second fixed plate 8.

[0049] Reference Figure 2 The feed plate 2 is bolted to one side of the first fixed plate 1. A square groove 21 is provided on the side of the feed plate 2 near the first fixed plate 1. A distribution plate 211 is installed in the square groove 21 and is bolted to the square groove 21.

[0050] Reference Figure 1There are two first pads 3. Both first pads 3 extend along the length of the feed plate 2 and are symmetrically installed on both sides of the feed plate 2 by bolts.

[0051] Reference Figure 3 The upper mold 4, middle mold 5, and lower mold 6 are arranged sequentially. The side of the upper mold 4 away from the middle mold 5 is bolted to the side of the first pad 3 away from the feed plate 2. An upper mounting groove 41 is formed on the side of the upper mold 4 near the middle mold 5, and an upper mold core 411 is bolted into the upper mounting groove 41. A first insert groove 51 is formed on the side of the middle mold 5 near the upper mold 4, and a first middle mold core 511 is bolted into the first insert groove 51. An upper cavity 4111 is formed on the side of the upper mold core 411 near the first middle mold core 511, and a first middle cavity 5111 is formed on the side of the first middle mold core 511 near the upper mold core 411, opposite to the upper cavity 4111. The upper cavity 4111 and the first middle cavity 5111 form a first mold cavity for producing products.

[0052] The lower mold 6 has a lower mounting groove 61 on the side near the middle mold 5, and a lower mold core 611 is installed in the lower mounting groove 61 by bolts. The middle mold 5 has a second insert groove 52 on the side near the lower mold 6, and a second middle mold core 521 is installed in the second insert groove 52 by bolts. The lower mold core 611 has a lower cavity 6111 on the side near the second middle mold core 521, and the second middle mold core 521 has a second middle cavity 5211 on the side near the lower mold core 611, which is opposite to the lower cavity 6111. The lower cavity 6111 and the second middle cavity 5211 form a second mold cavity for producing products.

[0053] Reference Figure 1 There are two second pads 7, both of which extend along the length of the lower mold 6 and are symmetrically installed on both sides of the lower mold 6 by bolts.

[0054] The second fixing plate 8 is bolted to the side of the two second pads 7 away from the lower mold 6. The lower mold 6 is fixed by installing the second fixing plate 8 on the injection molding machine.

[0055] Four limiting posts are provided on the side of the feed plate 2 near the first pad 3. The four limiting posts are respectively located at the four corners of the feed plate 2 and are fixed to the feed plate 2 by bolts. The limiting posts extend vertically towards the second fixed plate 8. The limiting posts pass through the first pad 3, the upper mold 4, the middle mold 5, the lower mold 6, and the second fixed plate 8. By setting the limiting posts, the middle mold 5 and the lower mold 6 can move closer to the upper mold 4 or further away from the upper mold 4.

[0056] Reference Figure 4The first fixing plate 1 is fixed with a feed nozzle 11 by bolts on the side away from the first pad block 3. The material distribution plate 211 has a cavity 2111 inside. A feed pipe 111 is provided between the material distribution plate 211 and the feed nozzle 11. One end of the feed pipe 111 is connected to the cavity 2111, and the other end of the feed pipe 111 is connected to the feed nozzle 11.

[0057] Reference Figure 5 A first distribution pipe 2112 and a second distribution pipe 2113 are provided on the side of the distribution plate 211 away from the first fixed plate 1. Two of each type of distribution pipe are provided, and the first and second distribution pipes are respectively located on opposite sides of the bottom wall of the distribution plate 211. The first distribution pipe 2112 extends vertically upwards towards the upper mold core 411, passing sequentially through the feed plate 2, the upper mold 4, and the upper mold core 411. The second distribution pipe 2113 extends vertically downwards towards the lower mold core 611, passing sequentially through the feed plate 2, the upper mold 4, the upper mold core 411, and the middle mold 5. During feeding, the injection molding machine injects molten raw material from the feed nozzle 11. The raw material enters the cavity 2111 of the distribution plate 211 from the feed nozzle 11. Subsequently, part of the raw material is injected into the first mold cavity from the first distribution pipe 2112, and another part of the raw material is injected into the second mold cavity from the second distribution pipe 2113.

[0058] Reference Figure 6 The dual-cavity molding die also includes a mold opening assembly 9, which consists of two sets, each set being disposed on one of the two side walls of the middle mold 5. The mold opening assembly 9 includes a first rack 91, a second rack 92, and a gear 93.

[0059] The middle mold 5 has an insertion groove 53 on its side wall for the gear 93 to be coaxially inserted. The gear 93 is rotatably connected to the insertion groove 53 via a rotating shaft. The upper mold 4 has a first groove 42 on its side wall, and a first rack 91 is fixed in the first groove 42 by bolts. The first rack 91 extends vertically toward the second fixing plate 8. The side walls of the middle mold 5, the lower mold 6, and the second pad 7 all have first guide grooves 54 for the first rack 91 to pass through. The first rack 91 and the gear 93 mesh with each other. The lower mold 6 has a second groove 62 on its side wall, and a second rack 92 is fixed in the second groove 62 by bolts. The second rack 92 extends vertically toward the first fixing plate 1. The side walls of the middle mold 5, the upper mold 4, and the first pad 3 all have second guide grooves 55 for the second rack 92 to pass through. The second rack 92 and the gear 93 mesh with each other. The outer peripheral wall of the gear 93 has a notch facing the direction of the second rack 92.

[0060] Reference Figure 7 and Figure 8A fixing cavity is provided on the side of the second rack 92 away from the gear 93. The fixing cavity is arranged along the length of the second rack 92. A connecting strip 9213 is slidably arranged in the fixing cavity. Fixing blocks 92131 and pressing blocks 92132 are provided at both ends of the connecting strip 9213. The fixing blocks 92131 and pressing blocks 92132 are arranged facing the side close to the bottom of the fixing cavity. The second rack 92 has a pressing groove at the bottom of the fixing cavity for the fixing blocks 92131 to pass through the fixing groove 9211 and for the pressing blocks 92132 to pass through. 9212, the fixing groove 9211 and the pressing groove 9212 both extend to the side wall of the second rack 92. The middle mold 5 has a positioning groove 56 on the side wall of the second guide groove 55 that is opposite to the fixing groove 9211. The second rack 92 has a fixing plate 9215 bolted to the cavity opening of the fixing cavity. Multiple springs 9214 are arranged between the connecting strip 9213 and the fixing plate 9215. The springs 9214 drive the connecting strip 9213 to slide towards the bottom of the fixing cavity, so that the fixing block 92131 is inserted into the positioning groove 56.

[0061] After the product is formed in the first and second mold cavities, the injection molding machine drives the lower mold 6 to move away from the middle mold 5. Because the fixing block 92131 is inserted into the positioning groove 56, the middle mold 5 and the lower mold 6 cannot open. The lower mold 6 drives the middle mold 5 to move away from the upper mold 4. The first mold cavity between the upper mold 4 and the middle mold 5 gradually opens. The gear 93 rotates under the drive of the first rack 91. When the notch of the gear 93 passes through the pressing block 92132 and the teeth of the gear 93 abut against the pressing block 92132, the pressing block 92132 drives the connecting block to move towards the bottom of the connecting groove 921. The connecting block drives the fixing block 92131 out of the positioning groove 56. At this time, the fixing block 92131 does not limit the middle mold 5. Driven by the first rack 91, the gear 93 drives the middle mold 5 to move to the side of the upper mold 4, so that the second mold cavity between the middle mold 5 and the lower mold 6 opens. The product can be taken out from the second mold cavity. This allows the product in the first mold cavity to cool and form first, and then be directly opened and taken out. After the product in the first mold cavity is taken out, the product in the second mold cavity has also cooled and formed, and can be opened and taken out. It is not necessary to take out the product in the second mold cavity first and then take out the product in the first mold cavity, saving time and costs. This improves the production efficiency of the product.

[0062] Reference Figure 6The dual-cavity molding die also includes a guide assembly 101, which includes a first guide rail 1011, a first guide bar 1012, a second guide rail 1013, and a second guide bar 1014. The first guide rail 1011 and the second guide rail 1013 are both bolted to the side wall of the middle mold 5, located on either side of the gear 93. The first guide bar 1012 is bolted to the side wall of the upper mold 4, vertically passing through the first guide rail 1011. The second guide bar 1014 is bolted to the side wall of the lower mold 6, vertically passing through the second guide rail 1013. By setting the guide assembly 101, the sliding of the middle mold 5 and the lower mold 6 becomes more stable, reducing the risk of sliding deviation between the middle mold 5 and the lower mold 6.

[0063] The dual-cavity molding die also includes a first ejection assembly 102 for ejecting the product from the first cavity and a second ejection assembly 103 for ejecting the product from the second cavity.

[0064] Reference Figure 9 The first ejection assembly 102 includes a first ejector plate 1021, a third ejector plate 1022, and a plurality of first ejector pins. The first ejector plate 1021 is located on the side of the upper mold 4 away from the middle mold 5, and is situated between two first pads 3. The third ejector plate 1022 is bolted to the side of the first ejector plate 1021 away from the upper mold 4. The plurality of first ejector pins pass vertically through the first ejector plate 1021, and are positioned facing the upper mold 4. The upper mold 4 has first ejector pin holes for the first ejector pins to pass through. The first ejector pin holes are connected to the upper cavity 4. 111 are interconnected. The first ejector pin abuts against the product surface. Four first sliding rods are bolted to the side of the upper mold 4 near the middle mold 5. The four first sliding rods extend vertically towards the feed plate 2. The first sliding rods pass through the upper mold 4, the first top plate 1021 and the third top plate 1022 in sequence, so that the third top plate 1022 can drive the first top plate 1021 to slide vertically towards the upper mold 4 or away from the upper mold 4, thereby driving multiple first ejector pins to protrude from the first mold cavity so that the product is ejected, or driving the first ejector pins to reset.

[0065] The second ejection assembly 103 includes a second ejector plate 1031, a fourth ejector plate 1032, and a plurality of second ejector pins. The second ejector plate 1031 is located on the side of the lower mold 6 away from the middle mold 5, and is situated between two second pads 7. The fourth ejector plate 1032 is bolted to the side of the second ejector plate 1031 away from the lower mold 6. The plurality of second ejector pins pass vertically through the second ejector plate 1031, and are oriented towards the lower mold 6. The lower mold 6 has second ejector pin holes for the second ejector pins to pass through. The cavities 6111 are interconnected. The second ejector pins abut against the product surface. The second fixed plate 8 is provided with four second sliding rods on the side near the middle mold 5. The four sliding rods extend vertically towards the middle mold 5. The second sliding rods pass through the fourth top plate 1032, the second top plate 1031 and the lower mold 6 in sequence, so that the four top plates can drive the second top plate 1031 to slide vertically towards the lower mold 6 or away from the lower mold 6, thereby driving multiple second ejector pins to protrude out of the second mold cavity so that the product is ejected, or driving the second ejector pins to reset.

[0066] Reference Figure 9 The dual-cavity molding die also includes an ejector drive assembly 104, of which two sets are provided, each set being disposed on one of the two side walls of the intermediate mold 5. The ejector drive assembly 104 includes a mounting block 1041, a first connecting post 1042, a second connecting post 1043, a first connecting block 1044, a second connecting block 1045, a first abutting block 1046, and a second abutting block 1047. Mounting block 1041 is integrally mounted on the side wall of middle mold 5. First connecting post 1042 is vertically welded to the side of mounting block 1041 near upper mold 4. First connecting post 1042 vertically passes through first top plate 1021 and third top plate 1022. First connecting block 1044 is threaded to first connecting post 1042. First connecting block 1044 is located on the side of third top plate 1022 away from first top plate 1021, and there is a gap between first connecting block 1044 and third top plate 1022. First abutting block 1046 is threaded to first connecting post 1042. First abutting block 1046 abuts against the side of first top plate 1021 away from third top plate 1022. The second connecting post 1043 is vertically welded to the side of the mounting block 1041 near the lower mold 6. The second connecting post 1043 passes vertically through the second top plate 1031 and the fourth top plate 1032. The second connecting block 1045 is threaded onto the second connecting post 1043. The second connecting block 1045 is located on the side of the fourth top plate 1032 away from the second top plate 1031, and there is a gap between the second connecting block 1045 and the fourth top plate 1032. The second abutting block 1047 is threaded onto the second connecting post 1043. The second abutting block 1047 abuts against the side of the second top plate 1031 away from the fourth top plate 1032.

[0067] When the middle mold 5 and the upper mold 4 open, the middle mold 5 moves away from the upper mold 4. The middle mold 5 drives the first connecting pillar 1042 to move away from the upper mold 4. The first connecting block 1044 on the first connecting pillar 1042 abuts against the first top plate 1021, thereby driving the first top plate 1021 to move towards the upper mold 4. The first top plate 1021 drives multiple first ejector pins to move towards the product, and the multiple first ejector pins simultaneously eject the product from the upper cavity 4111. When the middle mold 5 and the lower mold 6 open, the middle mold 5 moves away from the lower mold 6. The middle mold 5 drives the second connecting pillar 1043 to move away from the lower mold 6. The second connecting block 1045 on the second connecting pillar 1043 abuts against the second top plate 1031, thereby driving the second top plate 1031 to move towards the lower mold 6. The second top plate 1031 drives multiple second ejector pins to move towards the product. The multiple second ejector pins simultaneously eject the product from the lower cavity 6111. When the middle mold 5 and the upper mold 4 open, or when the middle mold 5 and the lower mold 6 open, the product can be ejected from the upper cavity 4111 / lower cavity 6111, which facilitates the ejection of the product.

[0068] Reference Figure 10 When the upper mold 4 and the middle mold 5 are closed, the middle mold 5 moves towards the upper mold 4. The first abutting block 1046 moves along with the first connecting post 1042. The first abutting block 1046 abuts against the first top plate 1021. The first abutting block 1046 drives the first top plate 1021 to move away from the upper mold 4 until the first ejector pin retracts into the first ejector pin hole, facilitating the reset of the first ejector pin. When the lower mold 6 and the middle mold 5 are closed, the middle mold 5 moves towards the lower mold 6. The second abutting block 1047 moves along with the second connecting post 1043. The second abutting block 1047 abuts against the second top plate 1031. The second abutting block 1047 drives the second top plate 1031 to move away from the lower mold 6 until the second ejector pin retracts into the second ejector pin hole, facilitating the reset of the second ejector pin. In another embodiment, the first abutment block 1046 can be replaced with a first compression spring 1048. One end of the first compression spring 1048 abuts against the mounting block 1041, and the other end abuts against the first top plate 1021. The first compression spring 1048 always presses the first top plate 1021 away from the upper mold 4, thereby facilitating the reset of the first ejector pin. The second abutment block 1047 can be replaced with a second compression spring 1049. One end of the second compression spring 1049 abuts against the mounting block 1041, and the other end abuts against the second top plate 1031. The second compression spring 1049 always presses the second top plate 1031 away from the lower mold 6, thereby facilitating the reset of the second ejector pin.

[0069] The implementation principle of a dual-cavity molding die in this application embodiment is as follows: After the product is molded in the first and second cavities, the injection molding machine drives the lower mold 6 to move away from the middle mold 5. Because the fixing block 92131 is inserted into the positioning groove 56, the middle mold 5 and the lower mold 6 cannot open. The lower mold 6 drives the middle mold 5 to move away from the upper mold 4. The first cavity between the upper mold 4 and the middle mold 5 gradually opens. The gear 93 rotates under the drive of the first rack 91. When the notch of the gear 93 passes through the pressing block 92132 and the teeth of the gear 93 abut against the pressing block 92132, the pressing block 92132 drives the connecting block to move away from the middle mold 5. When the bottom of the connecting groove 921 moves, the connecting block drives the fixing block 92131 to disengage from the positioning groove 56. At this time, the fixing block 92131 does not limit the middle mold 5. Driven by the first rack 91, the gear 93 drives the middle mold 5 to move to the side of the upper mold 4, opening the second mold cavity between the middle mold 5 and the lower mold 6. The product can then be removed from the second mold cavity. This allows the product in the first mold cavity to cool and solidify first, and then be directly removed from the mold. After the product in the first mold cavity is removed, the product in the second mold cavity has also cooled and solidified, and can be removed from the mold. There is no need to wait for the product in the second mold cavity to cool completely before opening the mold, saving time and costs. This improves the production efficiency of the product.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-cavity molding die, characterized in that, include: Upper mold (4), with an upper cavity (4111) on one side; The lower mold (6) is located on the side of the upper mold (4) near the upper cavity (4111), and the lower mold (6) has a lower cavity (6111) on the side of the upper mold (4) near the upper mold (4). The middle mold (5) is located between the upper mold (4) and the lower mold (6). The middle mold (5) has a first middle cavity (5111) on the side near the upper mold (4) that is opposite to the upper cavity (4111), and a second middle cavity (5211) on the side near the lower mold (6) that is opposite to the lower cavity (6111). The first middle cavity (5111) and the upper cavity (4111) form a first mold cavity, and the second middle cavity (5211) and the lower cavity (6111) form a second mold cavity. The mold opening assembly (9) is provided in two sets, and the two sets of mold opening assemblies (9) are provided on both sides of the middle mold (5). The mold opening assembly (9) includes a gear (93), a first rack (91) and a second rack (92). The gear (93) is provided on one side of the middle mold (5). The first rack (91) is provided on the side wall of the upper mold (4) and meshes with the gear (93). The side wall of the middle mold (5) is provided with a first guide groove (54) for the first rack (91) to pass through. The second rack (92) is provided on the side wall of the lower mold (6) and meshes with the gear (93). The side wall of the middle mold (5) is provided with a second guide groove (55) for the second rack (92) to pass through. The outer side wall of the gear (93) is provided with a notch. When the upper mold (4), the middle mold (5) and the lower mold (6) are in the mold closing state, the notch is directly opposite the second rack (92). The second rack (92) has a fixing groove (9211) on the side near the gear (93). A fixing block (92131) is slidably disposed in the fixing groove (9211). A spring (9214) is disposed between the fixing block (92131) and the bottom of the fixing groove (9211). The middle mold (5) has a positioning groove (56) on the side wall of the second guide groove (55) opposite to the fixing groove (9211). The spring (9214) presses part of the fixing block (92131) into the positioning groove (56). The side wall of the fixing block (92131) is provided with a connecting The second rack (92) has a connecting groove (921) on the side wall of the fixing groove (9211) for the connecting strip (9213) to pass through. The side wall of the connecting strip (9213) is provided with a pressing block (92132). The pressing block (92132) and the fixing block (92131) are arranged on the same side facing the connecting strip (9213). The second rack (92) has a pressing groove (9212) on the groove wall of the connecting groove (921) for the pressing block (92132) to pass through. The pressing block (92132) partially protrudes from the pressing groove (9212).

2. The dual-cavity molding die according to claim 1, characterized in that: It also includes a first ejection assembly (102) for ejecting the product from the first mold cavity and a second ejection assembly (103) for ejecting the product from the second mold cavity. The first ejection assembly (102) includes a first top plate (1021) and a plurality of first ejector pins. The first top plate (1021) is installed on the side of the upper mold (4) away from the middle mold (5). The plurality of first ejector pins are all installed on the first top plate (1021). The first ejector pins are arranged facing the upper mold (4). The upper mold (4) has a first ejector pin hole for the first ejector pin to pass through. The first ejector pin hole is interconnected with the upper cavity (4111). The second ejector assembly (103) includes a second top plate (1031) and a plurality of second ejector pins. The second top plate (1031) is installed on the side of the lower mold (6) away from the middle mold (5). The plurality of second ejector pins are all installed on the second top plate (1031). The second ejector pins are positioned facing the lower mold (6). The lower mold (6) has a second ejector pin hole for the second ejector pin to pass through. The second ejector pin hole is interconnected with the lower cavity (6111).

3. The dual-cavity molding die according to claim 2, characterized in that: The middle mold (5) is provided with a first connecting column (1042) on its side wall. The first connecting column (1042) is arranged in the direction of the first top plate (1021). The first connecting column (1042) penetrates the first top plate (1021). A first connecting block (1044) is provided at one end of the first connecting column (1042) that passes through the first top plate (1021). The middle mold (5) is provided with a second connecting column (1043) on its side wall. The second connecting column (1043) is positioned toward the second top plate (1031). The second connecting column (1043) penetrates the second top plate (1031). A second connecting block (1045) is provided at one end of the second connecting column (1043) that passes through the second top plate (1031).

4. A dual-cavity molding die according to claim 3, characterized in that: There is a gap between the first connecting block (1044) and the first top plate (1021), and there is a gap between the second connecting block (1045) and the second top plate (1031).

5. A dual-cavity molding die according to claim 3, characterized in that: The first connecting block (1044) is threaded to the first connecting post (1042), and the second connecting block (1045) is threaded to the second connecting post (1043).

6. A dual-cavity molding die according to claim 3, characterized in that: The first connecting post (1042) is provided with a first abutting block (1046), which abuts against the side of the first top plate (1021) near the upper mold (4). The second connecting post (1043) is provided with a second abutting block (1047), which abuts against the side of the second top plate (1031) near the lower mold (6).

7. A dual-cavity molding die according to claim 3, characterized in that: The middle mold (5) is provided with a mounting block (1041) on its side wall. The first connecting column (1042) and the second connecting column (1043) are both mounted on the mounting block (1041). The first connecting column (1042) is coaxially sleeved with a first compression spring (1048) on its outer periphery. One end of the first compression spring (1048) abuts against the mounting block (1041), and the other end of the first compression spring (1048) abuts against the first top plate (1021). The second connecting column (1043) is coaxially sleeved with a second compression spring (1049) on its outer periphery. One end of the second compression spring (1049) abuts against the mounting block (1041), and the other end of the second compression spring (1049) abuts against the second top plate (1031).

8. A dual-cavity molding die according to claim 1, characterized in that: It also includes a guide assembly (101), which includes a first guide rail (1011), a first guide bar (1012), a second guide rail (1013), and a second guide bar (1014). The first guide rail (1011) and the second guide rail (1013) are both installed on the side wall of the middle mold (5). The first guide rail (1011) and the second guide rail (1013) are located on both sides of the gear (93). The first guide bar (1012) is installed on the side wall of the upper mold (4) and passes vertically through the first guide rail (1011). The second guide bar (1014) is installed on the side wall of the lower mold (6) and passes vertically through the second guide rail (1013).

9. A dual-cavity molding die according to claim 1, characterized in that: The upper mold (4) has an upper mounting groove (41) on the side near the middle mold (5), and an upper mold core (411) is installed in the upper mounting groove (41). The upper cavity (4111) is located on the upper mold core (411). The middle mold (5) has a first insert groove (51) on the side near the upper mold (4), and a first middle mold core (511) is installed in the first insert groove (51). The first middle cavity (5111) is located on the first middle mold core (511). The lower mold (6) has a lower mounting groove (61) on the side near the middle mold (5), and a lower mold core (611) is installed in the lower mounting groove (61). The lower cavity (6111) is located on the lower mold core (611). The middle mold (5) has a second insert groove (52) on the side near the lower mold (6), and a second middle mold core (521) is installed in the second insert groove (52). The second middle cavity (5211) is located in the second middle mold core (521).

10. A dual-cavity molding die according to claim 2, characterized in that: Two first pads (3) are provided on the side of the upper mold (4) away from the middle mold (5). The two first pads (3) are located on both sides of the first top plate (1021). A feeding plate (2) is provided on the side of the two first pads (3) away from the upper mold (4). A first fixing plate (1) is provided on the side of the feeding plate (2) away from the upper mold (4). Two second pads (7) are provided on the side of the lower mold (6) away from the middle mold (5). The two second pads (7) are located on both sides of the second top plate (1031). A second fixing plate (8) is provided on the side of the two second pads (7) away from the upper mold (4).

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