Long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding

Abstract

This invention discloses a long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding, belonging to the field of injection mold technology. It includes a front mold, a middle mold, and a rear mold. A demolding assembly is provided between the middle mold and the rear mold. One side of the demolding assembly is a long rod structure, which extends through and connects to the interior of the rear mold. One end of the long rod structure is connected to an external electric screw. The demolding assembly is pushed by the electric screw to separate itself from the rear mold. Multiple sets of inner mold assemblies are fixed on the side of the rear mold near the demolding assembly. The demolding assembly consists of a rotating rod, a push rod, a pressure sensor, a demolding platen, and an overflow mold core. It can collect demolding resistance data in real time, accurately determine the sticking state, and achieve online monitoring of demolding resistance based on the pressure sensor. It automatically identifies abnormal sticking, promptly detects abnormalities, and stops the separation of the overflow mold core and the molding mold core, preventing the demolding platen from continuing to separate due to sticking and causing tearing damage to the product.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and more specifically, to a long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding. Background Technology

[0002] Liquid silicone is a special polymer material with high elasticity, resistance to high and low temperatures, excellent insulation, and good biocompatibility. It is widely used in the manufacture of components in electronic parts, medical devices, and precision seals. Liquid silicone injection molding offers advantages such as fast molding speed, high product precision, good consistency, and mass production capability, making it the mainstream processing method for silicone products. Three-platen injection molds, as the core equipment for precision injection molding, have independent flow distribution and demolding structures compared to two-platen molds. This allows for automatic separation of the gating system from the product, effectively avoiding gate residue and product damage. They are suitable for molding precision and complex silicone products, especially those with overflow packs, thin walls, and irregular shapes. They offer significant advantages in improving product molding precision and automated production efficiency, and are widely used in precision injection molding of liquid silicone.

[0003] The existing three-plate mold for liquid silicone injection molding mainly adopts a three-layer split structure of front mold, middle mold, and rear mold. The layered mold opening and closing action is achieved by the power of the mold base. The front mold injection structure, in conjunction with the middle mold's flow-diverting core, completes the diversion and filling of the cavity with liquid silicone. An in-mold cooling structure cools and solidifies the liquid silicone. After the product is molded, the ejector pins on the mold allow for demolding. A multi-layer parting structure separates the waste material from the gating system from the molded product, thus completing automated injection molding production.

[0004] However, when using existing three-plate liquid silicone injection molds to manufacture liquid silicone products with overflow packs, the extremely high viscosity of liquid silicone makes it easy for it to stick to the mold core after molding. This causes the existing molds to easily stick when relying on traditional rigid separation and demolding methods, which can easily damage the product surface, leading to a decrease in product yield and undoubtedly increasing the production cost.

[0005] In view of this, this application proposes a three-plate mold with high efficiency and adaptive demolding. Summary of the Invention

[0006] Technical problem to be solved: The purpose of this application is to provide a three-plate mold with adaptive demolding for long-stroke overflow pack for liquid silicone injection molding, which solves the technical problem mentioned in the background art above.

[0007] Technical Solution: This application provides a three-plate mold for self-adaptive demolding of long-stroke overflow packs for liquid silicone injection molding, including a front mold, a middle mold, and a rear mold. A demolding assembly is provided between the middle mold and the rear mold. One side of the demolding assembly is a long rod structure, which is connected through the rear mold. One end of the long rod structure is connected to an external electric screw. The demolding assembly is pushed by the electric screw to separate the demolding assembly from the rear mold. Multiple sets of inner mold assemblies are fixed on the side of the rear mold near the demolding assembly. Multiple flow divider cores are fixed on the side of the middle mold near the demolding assembly. The flow divider cores are inserted into the demolding assembly. Multiple glue pillars and multiple injection heads are connected on the side of the front mold near the middle mold. The glue pillars are inserted into the middle mold, and the injection heads are inserted into the flow divider cores. Multiple first sliding guides are slidably connected between the side wall of the middle mold and the side wall of the demolding assembly. The demolding assembly includes a push rod that is slidably connected to the inside of the rear mold. One end of the push rod is rotatably connected to a rotating rod, and one end of the rotating rod is fixedly connected to an electric lead screw. The other end of the push rod is connected to a pressure sensor. A demolding template is fixed to one side of the pressure sensor. Multiple overflow mold cores are fixedly inserted inside the demolding template. The overflow mold cores have four slots arranged in a cross shape on the side near the inner mold assembly. The pressure sensor is inserted into the inside of the rear mold. The inner mold assembly includes a fixing plate fixed inside the rear mold. A forming mold core is fixed on one side of the fixing plate, and four vibration motors are fixed on one side of the fixing plate in a cross pattern. The vibration motors are inserted into the forming mold core.

[0008] Furthermore, the overflow mold core is fitted between the forming mold core and the diversion mold core, and the overflow mold core and the diversion mold core cooperate to form a diversion cavity. The overflow mold core and the forming mold core cooperate to form multiple mold cavities. The mold cavities and the diversion cavities are internally connected, and one end of the vibration motor is inserted into the slot.

[0009] Furthermore, the inner mold assembly also includes a fixing component that runs through the fixed plate and the molding core. One side of the fixing component is a cross-shaped protrusion structure, and one side of the molding core is fixed with a hollow boss. Multiple ejector pins corresponding to the mold cavity are embedded and fixed inside the boss. The protrusion structure of the fixing component runs through the inside of the boss and is attached to the side wall of the four vibration motors respectively through the protrusion. The overflow mold core has a groove on its side wall, and a vibration guide block is fixed inside the groove. The vibration guide block has a cross-shaped limiting groove on its side wall. The boss is fitted into the groove, the vibration guide block is fitted into the hollow structure of the boss, the extension structure of the fixing component is slidably connected to the limiting groove, and one end of the extension structure of the fixing component is inserted into the slot.

[0010] Furthermore, the fixing component includes a servo motor fixed to the side wall of the fixing plate. A torque sensor is connected to the rotating end of the servo motor. A rotary push column is sleeved on one end of the torque sensor. The rotary push column is rotatably connected to the inside of the forming mold core. A bonding support plate is connected to one end of the rotary push column. Four bonding support plates are arranged in a cross shape. Four sliding grooves are opened on one end of the rotary push column. A sliding column is fixed to one end of the bonding support plate. The sliding column is slidably connected to the inside of the sliding groove. The bonding support plate is slidably connected to the inside of the boss and the limiting groove.

[0011] Furthermore, the support plate has a storage groove on the side near the limiting groove, and a V-shaped spring is provided inside the storage groove. One side of the V-shaped spring is inserted into the support plate. A vibration top groove is provided inside the limiting groove. The vibration top groove has an inclined groove structure. One side of the V-shaped spring is attached to the inside of the vibration top groove. The V-shaped spring is elastically compressed between the storage groove and the vibration top groove by being pushed by the support plate.

[0012] Furthermore, the outer wall of the vibration motor is fitted with a protective sleeve, which is positioned corresponding to the end of the support plate away from the sliding column.

[0013] Furthermore, the sheath has an inclined push groove on the side near the support plate, and the end of the support plate near the sheath has an inclined structure. The support plate moves toward the vibration motor so that the inclined structure is tightly attached to the inside of the inclined push groove.

[0014] Furthermore, the inclined surface inside the inclined push groove is fixed with multiple protrusions, and the inclined surface structure of the support plate is provided with multiple inclined fixed grooves corresponding to the protrusions.

[0015] Furthermore, the middle mold sidewall is fixed with a plurality of first sliding bolts, and the demolding mold sidewall is fixed with a plurality of second sliding bolts, both of which are slidably connected inside the first sliding guide frame.

[0016] Furthermore, the top and bottom surfaces of the rear mold are both fixed with a second sliding guide frame, and the top and bottom surfaces of the demolding template are both fixed with a third sliding bolt, which is slidably connected inside the second sliding guide frame.

[0017] Beneficial effects: One or more technical solutions provided in this application have at least the following technical effects or advantages: 1. It adopts a three-plate structure of front mold, middle mold and rear mold, and is equipped with a long rod demolding component to achieve long-stroke demolding, meet the demolding space requirements of overflow bag, break through the short-stroke demolding limitation of traditional molds, and is specially adapted to the liquid silicone overflow bag structure to effectively avoid product damage caused by demolding pull.

[0018] 2. The demolding assembly consists of a rotating rod, a push rod, a pressure sensor, a demolding platen, and an overflow mold core. It can collect demolding resistance data in real time, accurately determine the sticking state, and realize online monitoring of demolding resistance by relying on the pressure sensor. It can automatically identify abnormal sticking, promptly detect abnormalities, and stop the separation action of the overflow mold core and the forming mold core. This avoids the demolding platen from continuing to separate due to sticking, which would cause product tearing damage, improve yield, and reduce production costs.

[0019] 3. The rear mold integrates multiple sets of inner mold components with vibration motors. The vibration motors can be aligned and cooperate with the overflow mold core slots. By relying on vibration, the adhesive force of the silicone is weakened, causing the overflow mold core to detach from the product, quickly solving the problem of sticking to the mold, thereby ensuring the production effect and quality of the product.

[0020] 4. The end of the vibration motor is inserted into the slot of the overflow mold core to form a rigid docking structure. The vibration energy can be directly transmitted to the entire area of ​​the overflow mold core, with low vibration transmission loss and improved debonding effect.

[0021] 5. A cross-shaped fixing component is added, which can extend outward to fit and fix the side wall of the vibration motor, preventing the vibration motor from loosening or shifting and ensuring the vibration effect of the vibration motor. In addition, the overflow mold core has grooves and limiting grooves, and the boss and vibration guide block are inserted and matched in sequence. The fixing component slides into the limiting groove and slot, realizing a multi-level vibration transmission path between the vibration motor, fixing component, vibration guide block and overflow mold core, expanding the vibration range, and realizing precise positioning and guidance of each mold core and component, further reducing the probability of product damage.

[0022] 6. The fixing component uses a servo motor as its power source and is equipped with a torque sensor to monitor the locking torque in real time. The rotary push column drives four sets of cross-shaped bonding support plates to extend radially outward synchronously through the sliding push groove and the sliding column, so as to achieve synchronous clamping and fixing of the four sets of vibration motors. The clamping force is precise and controllable, which not only prevents the vibration motors from loosening, but also avoids rigid compression that could damage the equipment. The sliding column and the sliding push groove slide together to ensure smooth extension and retraction of the bonding support plates, and at the same time unifies the working status of the four vibration motors, improving vibration synchronization.

[0023] 7. The support plate has a built-in V-shaped spring sheet, and the limiting groove is set with an oblique vibration top groove. When the support plate extends and clamps, the V-shaped spring sheet is compressed and stores energy. During the demolding process, the overflow mold core gradually moves away from the vibration motor. The compressed V-shaped spring sheet can be elastically extended and continuously fits the vibration top groove, so that vibration is maintained throughout the separation of the overflow mold core. The elastic structure enables vibration transmission throughout the process. Even if the overflow mold core separates from the main body of the vibration motor, vibration can still be continuously applied to assist in demolding, completely solving the problem of mold sticking in the later stage of separation.

[0024] 8. Adding a protective sleeve to the outer wall of the vibratory motor provides physical protection for the motor housing, preventing wear and insulation damage and improving the operational safety and durability of the vibratory motor. On the other hand, the sleeve serves as a clamping and docking reference surface, precisely corresponding to the support plate to ensure stable clamping position. The dedicated docking sleeve improves the clamping fit accuracy, eliminates slippage on the contact surface, and enhances locking reliability.

[0025] 9. The sheath is provided with a slanted push groove, and the end of the support plate is provided with a slanted surface. The slanted surface and the slanted push groove fit together. The guiding effect of the slanted surface is used to improve the alignment accuracy. The interlocking structure of the slanted surface increases the contact area and friction, improves the clamping stability, and further enhances the fixing effect of the vibration motor. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the three-plate mold structure for the long-stroke overflow pack adaptive demolding of liquid silicone injection molding according to the present invention.

[0027] Figure 2 This is a schematic diagram of the overall structure of the present invention in the separated state of the front mold, middle mold and rear mold.

[0028] Figure 3 This is a schematic diagram of the demolding component of the present invention in the state of separation from the rear mold.

[0029] Figure 4 This is a schematic diagram of the intermediate mold structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the demolding component structure of the present invention.

[0031] Figure 6 This is a schematic diagram of the connection structure between the inner mold assembly and the rear mold of the present invention.

[0032] Figure 7 This is a schematic diagram of the inner mold assembly and the overflow mold core in a bonded state according to the present invention.

[0033] Figure 8 This is a schematic diagram of the internal mold assembly and the overflow mold core in a separated state according to the present invention.

[0034] Figure 9 This is a schematic diagram of the internal mold component structure of the present invention.

[0035] Figure 10 This is a schematic diagram of the fixing component structure of the present invention.

[0036] Figure 11 This is a schematic diagram of the internal structure of the fixing component of the present invention.

[0037] Figure 12 This is a schematic diagram of the vibration motor structure of the present invention.

[0038] Figure 13This is a schematic diagram of the support plate structure of the present invention.

[0039] Figure 14 This is a schematic diagram of the inclined groove structure on the support plate of the present invention.

[0040] Explanation of the labels in the diagram: 100, front mold; 110, glue column; 120, injection head; 200, middle mold; 210, flow divider core; 220, first slide bolt; 300, rear mold; 400, demolding assembly; 410, rotating rod; 420, ejector pin; 430, pressure sensor; 440, demolding plate; 450, second slide bolt; 460, third slide bolt; 470, overflow core; 471, groove; 472, vibration guide block; 4721, limiting groove; 4722, vibration top groove; 473, slot; 500, first... 600, Second sliding guide; 700, Inner mold assembly; 710, Molding mold core; 711, Boss; 720, Fixing plate; 730, Fixing component; 731, Servo motor; 732, Torque sensor; 733, Rotary push column; 7331, Sliding push groove; 734, Fixing support plate; 7341, Storage groove; 7342, V-shaped spring; 7343, Sliding column; 7344, Inclined fixed groove; 740, Vibration motor; 741, Sheath; 7411, Inclined push groove; 7412, Protrusion; 750, Ejector pin. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a link; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] Reference Figures 1-14 This application provides a three-plate mold for long-stroke overflow pack adaptive demolding in liquid silicone injection molding, including a front mold 100, a middle mold 200, and a rear mold 300. A demolding assembly 400 is provided between the middle mold 200 and the rear mold 300. One side of the demolding assembly 400 is a long rod structure, which extends through and connects to the interior of the rear mold 300. One end of the long rod structure of the demolding assembly 400 is connected to an external electric screw. The demolding assembly 400 is pushed by the electric screw to separate the demolding assembly 400 from the rear mold 300. Multiple sets of inner mold assemblies 700 are fixed on the side of the middle mold 200 near the demolding assembly 400. Multiple flow divider cores 210 are fixed on the side of the middle mold 200 near the demolding assembly 400. The flow divider cores 210 are inserted into the demolding assembly 400. Multiple glue pillars 110 and multiple injection heads 120 are connected on the side of the front mold 100 near the middle mold 200. The glue pillars 110 are inserted into the middle mold 200, and the injection heads 120 are inserted into the flow divider cores 210. Multiple first sliding guides 500 are slidably connected between the side wall of the middle mold 200 and the side wall of the demolding assembly 400. The demolding assembly 400 includes a push rod 420 slidably connected inside the rear mold 300. One end of the push rod 420 is rotatably connected to a rotating rod 410. One end of the rotating rod 410 is fixedly connected to an electric lead screw. The other end of the push rod 420 is connected to a pressure sensor 430. A demolding template 440 is fixed to one side of the pressure sensor 430. Multiple overflow mold cores 470 are fixedly fixed inside the demolding template 440. The overflow mold cores 470 have four slots 473 arranged in a cross shape on the side near the inner mold assembly 700. The pressure sensor 430 is inserted into the rear mold 300. The inner mold assembly 700 includes a fixing plate 720 fixed inside the rear mold 300. A forming mold core 710 is fixed on one side of the fixing plate 720. Four vibration motors 740 are fixed in a cross pattern on one side of the fixing plate 720. The vibration motors 740 are inserted into the forming mold core 710. It adopts a three-plate structure of front mold 100, middle mold 200 and rear mold 300, and is equipped with a long rod demolding component 400 to achieve long-stroke demolding, meet the demolding space requirements of overflow bag, break through the short-stroke demolding limitation of traditional molds, and is specially adapted to the liquid silicone overflow bag structure to effectively avoid product damage caused by demolding pull; The demolding assembly 400 consists of a rotating rod 410, a push rod 420, a pressure sensor 430, a demolding template 440, and an overflow mold core 470. It can collect demolding resistance data in real time, accurately judge the sticking state, realize online monitoring of demolding resistance by relying on the pressure sensor 430, automatically identify the sticking abnormality, promptly detect the abnormality and stop the separation action of the overflow mold core 470 and the forming mold core 710, avoid the demolding template 440 from continuing to separate due to sticking and causing product tearing damage, improve yield rate and reduce production cost; The rear mold 300 integrates multiple sets of inner mold components 700 with vibration motors 740. The vibration motors 740 can be aligned and cooperate with the overflow mold core 470 slot 473. By relying on vibration to weaken the adhesive force of silicone, the overflow mold core 470 is detached from the product, which quickly solves the problem of sticking to the mold and thus ensures the production effect and quality of the product.

[0045] In this embodiment, the overflow mold core 470 is fitted between the forming mold core 710 and the diversion mold core 210. The overflow mold core 470 and the diversion mold core 210 cooperate to form a diversion cavity. The overflow mold core 470 and the forming mold core 710 cooperate to form multiple mold cavities. The mold cavities and the diversion cavities are internally connected. One end of the vibration motor 740 is inserted into the slot 473. The overflow mold core 470 is sandwiched between the molding mold core 710 and the diversion mold core 210, forming a connected diversion cavity and mold cavity respectively, ensuring continuous flow and complete filling of liquid silicone, and reducing injection molding defects; the end of the vibration motor 740 is inserted into the slot 473 of the overflow mold core 470 to form a rigid docking structure, and the vibration energy can be directly transmitted to the entire area of ​​the overflow mold core 470, with low vibration transmission loss and improved debonding effect.

[0046] In this embodiment, the inner mold assembly 700 further includes a fixing component 730 that penetrates the inside of the fixing plate 720 and the molding core 710. One side of the fixing component 730 has a cross-shaped protrusion structure, and one side of the molding core 710 has a hollow boss 711 fixed therein. Multiple ejector pins 750 corresponding to the mold cavity are embedded and fixed inside the boss 711. The protrusion structure of the fixing component 730 is connected through the inside of the boss 711, and the protrusion structure of the fixing component 730 is respectively attached to the side wall of the four vibration motors 740 through the protrusion. The overflow mold core 470 has a groove 471 on its side wall, and a vibration guide block 472 is fixed inside the groove 471. The vibration guide block 472 has a cross-shaped limiting groove 4721 on its side wall. The boss 711 is fitted into the groove 471, the vibration guide block 472 is fitted into the hollow structure of the boss 711, the extension structure of the fixing component 730 is slidably connected to the limiting groove 4721, and one end of the extension structure of the fixing component 730 is inserted into the slot 473 through the extension. A cross-shaped fixing component 730 is added, which can extend outward to fit and fix the side wall of the vibration motor 740, preventing the vibration motor 740 from loosening or shifting, and ensuring the vibration effect of the vibration motor 740. In addition, the overflow mold core 470 has a groove 471 and a limiting groove 4721, and the boss 711 and the vibration guide block 472 are inserted and matched in sequence. The fixing component 730 slides into the limiting groove 4721 and the slot 473, realizing a multi-level vibration transmission path between the vibration motor 740, the fixing component 730, the vibration guide block 472, and the overflow mold core 470, expanding the vibration range, and realizing precise positioning and guidance of each mold core and component, further reducing the probability of product damage.

[0047] In this embodiment, the fixing component 730 includes a servo motor 731 fixed to the side wall of the fixing plate 720. The rotating end of the servo motor 731 is connected to a torque sensor 732. One end of the torque sensor 732 is sleeved with a rotary push column 733. The rotary push column 733 is rotatably connected to the inside of the forming mold core 710. One end of the rotary push column 733 is connected to a bonding support plate 734. Four bonding support plates 734 are arranged in a cross shape. One end of the rotary push column 733 has four sliding grooves 7331. One end of the bonding support plate 734 is fixed with a sliding column 7343. The sliding column 7343 is slidably connected to the inside of the sliding groove 7331. The bonding support plate 734 is slidably connected to the inside of the boss 711 and the limiting groove 4721. The fixing component 730 uses a servo motor 731 as its power source and is equipped with a torque sensor 732 to monitor the locking torque in real time. The rotary push column 733 drives four sets of cross-shaped bonding support plates 734 to extend radially outward synchronously through the sliding push groove 7331 and the sliding column 7343, so as to achieve synchronous clamping and fixing of the four sets of vibration motors 740. The clamping force is precise and controllable, which not only prevents the vibration motors 740 from loosening, but also avoids rigid compression that could damage the equipment. The sliding column 7343 and the sliding push groove 7331 slide together to ensure that the extension and retraction of the bonding support plate 734 is smooth, and at the same time unifies the working state of the four vibration motors 740, improving vibration synchronization.

[0048] In this embodiment, the support plate 734 has a storage groove 7341 on the side near the limiting groove 4721. A V-shaped spring piece 7342 is provided inside the storage groove 7341. One side of the V-shaped spring piece 7342 is inserted into the support plate 734. A vibration top groove 4722 is provided inside the limiting groove 4721. The vibration top groove 4722 has an inclined groove structure. One side of the V-shaped spring piece 7342 is attached to the inside of the vibration top groove 4722. The V-shaped spring piece 7342 is elastically compressed between the storage groove 7341 and the vibration top groove 4722 by being pushed by the support plate 734. The support plate 734 has a built-in V-shaped spring sheet 7342, and the limiting groove 4721 is correspondingly provided with an inclined vibration top groove 4722. When the support plate 734 extends outward to clamp, the V-shaped spring sheet 7342 is compressed and stores energy. During the demolding process, the overflow mold core 470 gradually moves away from the vibration motor 740. The compressed V-shaped spring sheet 7342 can be elastically extended and continuously fits the vibration top groove 4722, so that vibration transmission is maintained throughout the separation of the overflow mold core 470. The elastic structure enables vibration transmission throughout the process. Even if the overflow mold core 470 separates from the main body of the vibration motor 740, vibration can still be continuously applied to assist in demolding, completely solving the problem of mold sticking in the later stage of separation.

[0049] In this embodiment, a protective sleeve 741 is fitted onto the outer wall of the vibration motor 740, and the protective sleeve 741 is correspondingly positioned at the end of the support plate 734 away from the sliding column 7343. The addition of the protective sleeve 741 to the outer wall of the vibration motor 740 serves two purposes: firstly, it provides physical protection for the motor housing, preventing wear and insulation damage, and improving the operational safety and durability of the vibration motor 740; secondly, the protective sleeve 741 serves as a clamping and docking reference surface, precisely corresponding to the support plate 734, ensuring stable clamping position. The dedicated docking protective sleeve 741 improves the clamping and fitting accuracy, eliminates slippage on the contact surface, and enhances locking reliability.

[0050] In this embodiment, the sheath 741 has a slanted push groove 7411 on the side near the support plate 734, and the support plate 734 has a slanted structure at one end near the sheath 741. The support plate 734 moves toward the vibration motor 740 so that the slanted structure is tightly attached to the inside of the slanted push groove 7411. The sheath 741 has a slanted push groove 7411, and the end of the support plate 734 is provided with a slanted surface. The slanted surface and the slanted push groove 7411 fit together. The slanted surface guides and improves the alignment accuracy. The slanted surface interlocking structure increases the contact area and friction, improves the clamping stability, and further strengthens the fixing effect of the vibration motor 740.

[0051] In this embodiment, the inclined surface inside the inclined push groove 7411 is fixed with a plurality of protrusions 7412, and the inclined surface structure of the support plate 734 is provided with a plurality of inclined fixed grooves 7344 corresponding to the protrusions 7412; the inclined push groove 7411 is provided with protrusions 7412, and the inclined surface of the support plate 734 is provided with matching inclined fixed grooves 7344. When the support plate 734 is attached, the protrusions 7412 are embedded in the inclined fixed grooves 7344 to form an embedded snap-lock positioning structure, which restricts the relative displacement between components. Under high-frequency vibration and reciprocating motion conditions, the position remains fixed, the positioning accuracy is stable over a long period of time, and it is suitable for long-term continuous production of molds.

[0052] In this embodiment, the middle mold 200 is fixed with a plurality of first sliding bolts 220 on its side wall, and the demolding template 440 is fixed with a plurality of second sliding bolts 450 on its side wall. The first sliding bolts 220 and the second sliding bolts 450 are both slidably connected inside the first sliding guide frame 500. The middle mold 200 is provided with first sliding bolts 220 on its side wall, and the demolding template 440 is provided with second sliding bolts 450 on its side wall. The two are simultaneously slidably assembled inside the first sliding guide frame 500 to limit the relative movement of the middle mold 200 and the demolding template 440 in both directions, ensuring that the opening and closing and separation actions run smoothly along the preset trajectory.

[0053] In this embodiment, the top and bottom surfaces of the rear mold 300 are both fixed with second sliding guide frames 600, and the top and bottom surfaces of the demolding template 440 are both fixed with third sliding bolts 460. The third sliding bolts 460 are slidably connected to the inside of the second sliding guide frames 600. The second sliding guide frames 600 are installed on the upper and lower surfaces of the rear mold 300, and the demolding template 440 is correspondingly provided with the third sliding bolts 460 and slides with them. The demolding template 440 is synchronously guided and constrained from the upper and lower ends, the force during the demolding process is balanced, the demolding template 440 is ensured to move horizontally as a whole, the warping and swaying of the demolding template 440 are eliminated, the wear of the mold core and sliding parts is greatly reduced, the smoothness of mold operation and structural durability are improved, and the working conditions of long-stroke demolding are met.

[0054] Specifically, according to Figures 1-14 As shown, the main controller controls the external electric screw to pull the rotating rod 410, bringing the demolding assembly 400 into contact with the rear mold 300. Then, the main controller controls the external base to push the rear mold 300, the middle mold 200, and the front mold 100 into close contact. The glue column 110 is inserted into the middle mold 200, and there is frictional resistance between the glue column 110 and the middle mold 200. This frictional resistance is sufficient to cause the middle mold 200 to move horizontally on the first sliding guide 500, while the injection head 120 is inserted into... Inside the flow divider core 210, the external injection molding machine introduces liquid silicone into the front mold 100. The front mold 100 introduces the liquid silicone into the flow divider core 210 through the injection head 120, and then flows through the flow divider core 210 into the flow divider cavity between the flow divider core 470 and the overflow core 470. Then it flows into the molding cavity between the overflow core 470 and the molding core 710, and is cooled and shaped by the cooling pipes inside the middle mold 200 and the rear mold 300. Then, the main controller controls the external base to pull the rear mold 300. Under the frictional resistance of the glue column 110, the middle mold 200 slides on the first sliding guide 500, so that the middle mold 200 is initially separated from the demolding template 440. As the rear mold 300 continues to move, the middle mold 200 drives the first sliding guide 500 to slide on the second sliding bolt 450 on the demolding template 440, so that the middle mold 200 plate is further separated from the demolding template 440, so that there is a larger gap between the middle mold 200 plate and the demolding template 440. Then the first sliding guide 500 is positioned on the demolding template 440. The first sliding guide 500 continues to drive the middle mold 200 to separate from the front mold 100, separating the injection head 120 from the diversion mold core 210. Then the main controller controls the three-axis robot to grab and remove the formed part from the overflow mold core 470. Then, the main controller controls the external electric lead screw to move towards the rear mold 300, causing the push rod 420 to move inside the rear mold 300. The push rod 420 pushes the pressure sensor 430, which in turn pushes the ejector plate 440. The ejector plate 440 causes the overflow mold core 470 to begin separating from the forming mold core 710. During the separation process, the pressure sensor 430 monitors in real time the pressure generated by pushing the ejector plate 440. The ejector plate 440 is connected to the second guide rail 600 via the third sliding bolt 46. The upward sliding ensures the stability of the sliding separation. The overflow mold core 470 separates from the forming mold core 710. The formed product remains on the forming mold core 710 and the ejector pin 750. The main controller starts the external six-axis part picker, which moves multiple grippers to each product and starts the ejector pin 750 to push the product out and pick it up. Then, the demolding assembly 400 is driven to retract and close with the rear mold 300. The rear mold 300 and the mold assembly are pushed to close with the middle mold 200 and the front mold 100 and the injection molding work is performed again. When the push rod 420 is pushed to separate the overflow mold core 470 from the forming mold core 710 and the product, if the overflow mold core 470 sticks to the product, the pulling force of the sticking will increase the resistance of the push rod 420 in pushing the demolding plate 440, which will increase the pressure detected by the pressure sensor 430. At this time, the pressure sensor 430 transmits the data of the sudden increase in load to the main controller. When the pressure sensor 430 detects that the additional resistance caused by the sticking is greater than 5kN, the main controller controls the push rod 420 to stop moving and controls the vibration motor 740 to start and vibrate 3 times at a frequency of 0.5Hz and an amplitude of 2mm. The vibration motor 740 causes the overflow mold core 470 and the forming mold core 710 to vibrate, which causes the overflow mold core 470 to separate from the product. After the pressure sensor 430 detects that the pressure has stabilized and decreased, the push rod 420 is pushed to completely separate the overflow mold core 470. After prolonged use, the vibration motor 740 may loosen from the fixing plate 720. In this case, vibration by the motor 740 may not guarantee timely separation of the overflow mold core 470 from the product. Consequently, after vibration, the pressure monitored by the pressure sensor 430 does not decrease stably. Then, the main controller starts each servo motor 731, which drives the torque sensor 732 to rotate. The torque sensor 732 drives the rotary push column 733 to rotate, causing the sliding column 7343 to slide inside the sliding groove 7331, thereby simultaneously pushing the four support plates 73... 4. Extend outward until the inclined surface of the support plate 734 is pressed tightly against the inside of the inclined push groove 7411 on the sheath 741. The protrusion 7412 is inserted into the inclined fixed groove 7344. The torque sensor 732 monitors the torque when pushing the support plate 734 outward in real time to ensure that the support plate 734 is pressed tightly against the sheath 741, improve the stability of the vibration motor 740, and transmit the vibration through the support plate 734 to ensure the vibration effect. It also enhances the vibration synchronization of the four vibration motors 740 and avoids the overall vibration effect from being affected by the abnormality of a single vibration motor 740. Simultaneously, when the support plate 734 moves and fits against the sheath 741, the V-shaped spring sheet 7342 is compressed and contracted between the receiving groove 7341 and the vibration top groove 4722. Thus, when the vibration motor 740 vibrates the overflow mold core 470, the V-shaped spring sheet 7342 also transmits the vibration action on the support plate 734 to the vibration guide block 472 of the overflow mold core 470. Therefore, when the overflow mold core 470 moves and just separates from the vibration motor 740, the compressed V-shaped spring sheet 7342 can still elastically recover and remain fitted inside the vibration top groove 4722. It can also vibrate the overflow mold core 470 during the separation process, further ensuring the vibration separation effect between the overflow mold core 470 and the product, thereby ensuring the quality of the molded product.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. All electrical components mentioned herein are electrically connected to the main controller and 220V AC mains power, and the main controller is a common existing technology such as a computer that performs control functions. Content not described in detail in this specification is prior art known to those skilled in the art.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A three-plate mold with a long-stroke overflow pack and adaptive demolding for liquid silicone injection molding, characterized in that: The device includes a front mold, a middle mold, and a rear mold. A demolding assembly is provided between the middle mold and the rear mold. One side of the demolding assembly is a long rod structure, which is connected through the rear mold. One end of the long rod structure is connected to an external electric screw. The demolding assembly is pushed by the electric screw to separate it from the rear mold. Multiple sets of inner mold assemblies are fixed on the side of the rear mold near the demolding assembly. Multiple flow divider cores are fixed on the side of the middle mold near the demolding assembly. The flow divider cores are inserted into the demolding assembly. Multiple glue pillars and multiple injection heads are connected on the side of the front mold near the middle mold. The glue pillars are inserted into the middle mold, and the injection heads are inserted into the flow divider cores. Multiple first sliding guides are slidably connected between the side wall of the middle mold and the side wall of the demolding assembly. The demolding assembly includes a push rod that is slidably connected to the inside of the rear mold. One end of the push rod is rotatably connected to a rotating rod, and one end of the rotating rod is fixedly connected to an electric lead screw. The other end of the push rod is connected to a pressure sensor. A demolding template is fixed to one side of the pressure sensor. Multiple overflow mold cores are fixedly inserted inside the demolding template. The overflow mold cores have four slots arranged in a cross shape on the side near the inner mold assembly. The pressure sensor is inserted into the inside of the rear mold. The inner mold assembly includes a fixing plate fixed inside the rear mold. A forming mold core is fixed on one side of the fixing plate, and four vibration motors are fixed on one side of the fixing plate in a cross pattern. The vibration motors are inserted into the forming mold core.

2. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 1, characterized in that: The overflow mold core is fitted between the forming mold core and the diversion mold core. The overflow mold core and the diversion mold core cooperate to form a diversion cavity. The overflow mold core and the forming mold core cooperate to form multiple mold cavities. The mold cavities and the diversion cavities are internally connected. One end of the vibration motor is inserted into the slot.

3. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 2, characterized in that: The inner mold assembly also includes a fixing component that runs through the fixed plate and the molding core. One side of the fixing component is a cross-shaped protrusion structure, and one side of the molding core is fixed with a hollow boss. Multiple ejector pins corresponding to the mold cavity are embedded and fixed inside the boss. The protrusion structure of the fixing component runs through the inside of the boss and is attached to the side wall of the four vibration motors respectively through the protrusion. The overflow mold core has a groove on its side wall, and a vibration guide block is fixed inside the groove. The vibration guide block has a cross-shaped limiting groove on its side wall. The boss is fitted into the groove, the vibration guide block is fitted into the hollow structure of the boss, the extension structure of the fixing component is slidably connected to the limiting groove, and one end of the extension structure of the fixing component is inserted into the slot.

4. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 3, characterized in that: The fixing component includes a servo motor fixed to the side wall of the fixing plate. A torque sensor is connected to the rotating end of the servo motor. A rotary push column is sleeved on one end of the torque sensor. The rotary push column is rotatably connected to the inside of the forming mold core. A bonding support plate is connected to one end of the rotary push column. Four bonding support plates are arranged in a cross shape. Four sliding grooves are opened on one end of the rotary push column. A sliding column is fixed to one end of the bonding support plate. The sliding column is slidably connected to the inside of the sliding groove. The bonding support plate is slidably connected to the inside of the boss and the limiting groove.

5. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 4, characterized in that: The support plate has a storage groove on the side near the limiting groove. A V-shaped spring is provided inside the storage groove. One side of the V-shaped spring is inserted into the support plate. A vibration top groove is provided inside the limiting groove. The vibration top groove has an inclined groove structure. One side of the V-shaped spring is attached to the inside of the vibration top groove. The V-shaped spring is elastically compressed between the storage groove and the vibration top groove by being pushed by the support plate.

6. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 4, characterized in that: The vibratory motor is fitted with a protective sleeve on its outer wall, and the protective sleeve is positioned corresponding to the end of the support plate away from the sliding column.

7. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 6, characterized in that: The sheath has a slanted push groove on the side near the support plate, and the support plate has a slanted structure at the end near the sheath. The support plate moves toward the vibration motor so that the slanted structure is tightly attached to the inside of the slanted push groove.

8. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 7, characterized in that: The inclined surface inside the inclined push groove has multiple protrusions fixed thereon, and the inclined surface structure of the support plate has multiple inclined fixed grooves corresponding to the protrusions.

9. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 1, characterized in that: The middle mold sidewall is fixed with a plurality of first sliding bolts, and the demolding mold sidewall is fixed with a plurality of second sliding bolts. Both the first and second sliding bolts are slidably connected inside the first sliding guide frame.

10. The long-stroke overflow pack adaptive demolding three-plate mold for liquid silicone injection molding according to claim 1, characterized in that: The top and bottom surfaces of the rear mold are both fixed with a second sliding guide frame, and the top and bottom surfaces of the demolding template are both fixed with a third sliding bolt, which is slidably connected inside the second sliding guide frame.

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