Injection mold with mechanical microvibration demolding mechanism

Abstract

This invention relates to the field of injection mold technology and discloses an injection mold with a mechanical micro-vibration demolding mechanism, comprising: a fixed mold base and a movable mold base disposed directly above the fixed mold base, and further comprising: a fixed plate bolted to the fixed mold base; two side mold plates, each bolted to the upper sides of the fixed plate; two sets of trigger elements, each located within one of the two side mold plates; two sets of micro-vibration elements, each located within one of the two side mold plates; a first ejector plate located above the fixed plate; and a second ejector plate bolted to the first ejector plate. This invention integrates the trigger elements and micro-vibration elements within the side mold plates, utilizing the mold closing action itself as a power source, eliminating the need for an external vibration motor or hydraulic drive device, thus achieving a purely mechanical automatic micro-vibration demolding function.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and specifically to an injection mold with a mechanical micro-vibration demolding mechanism. Background Technology

[0002] During the mold opening and demolding process, vacuum adhesion and static friction are commonly present between the molded part and the mold surface, especially for parts with deep ribs, thin walls, and high surface finish, where sticking is more pronounced. Current technologies typically alleviate demolding difficulties by increasing ejection force, increasing ejection speed, or applying a release agent to the mold surface. However, simply increasing ejection force can easily lead to localized stress concentration in the molded part, resulting in defects such as whitening, deformation, or even cracking. Furthermore, the magnitude of the ejection force is difficult to precisely match the actual adhesion state of different parts, and excessive ejection force can accelerate the wear of ejector pins and cavity surfaces, shortening mold life. While increasing ejection speed can shorten demolding time to some extent, high-speed ejection also exacerbates mechanical damage to the molded part surface. Moreover, if the molded part is not completely freed from the mold surface constraint at the moment of ejection, rapid displacement may cause warping or dimensional deviations due to inertia. While applying release agents can reduce the interfacial friction coefficient, repeated spraying increases production steps and costs. Residual release agents can also contaminate the product surface, affecting the quality of subsequent coating, bonding, and other secondary processing. Furthermore, the consumption of release agents is difficult to control consistently during continuous production, leading to inconsistent demolding results between batches. Some molds use external vibration motors to assist demolding, but these motors require independent installation space and power supply lines, increasing the complexity of the mold structure and manufacturing costs. Additionally, the vibration frequency and amplitude adjustment range of external vibration sources are limited, making it difficult to precisely adapt them to products of different materials and structures. Moreover, continuous vibration negatively impacts the overall rigidity of the mold and the fatigue life of fasteners.

[0003] Existing demolding technologies still have significant shortcomings in balancing demolding quality, mold life, and production efficiency. There is an urgent need for a technical solution that can achieve controllable micro-vibration demolding through the mold's own structure without adding an external power source. Summary of the Invention

[0004] This invention provides an injection mold with a mechanical micro-vibration demolding mechanism, which enables the ejector pin assembly to generate high-frequency, short-stroke axial micro-vibration in the demolding direction.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: An injection mold with a mechanical micro-vibration demolding mechanism includes: a fixed mold base and a movable mold base disposed directly above the fixed mold base, and further includes: A fixed plate is bolted to the top of the fixed mold base; two side mold plates are provided, each bolted to the top of one side of the fixed plate; two sets of trigger elements are provided, each located within one of the two side mold plates; two sets of micro-vibration elements are provided, each located within one of the two side mold plates; a first ejector plate is located above the fixed plate; a second ejector plate is bolted to the top of the first ejector plate; a fixed mold plate is bolted to the top of the two side mold plates on both sides; a fixed mold core plate is embedded within the fixed mold plate; an ejector pin assembly has its lower end located above the first ejector plate and passing through the second ejector plate, with its upper end extending into the fixed mold core plate; a moving mold plate is bolted to the bottom of the moving mold base; and a moving mold core plate is embedded within the moving mold base. Within the moving template: four first guide pillars are provided, each located at one end of a side template and passing through a fixed template; four guide sleeves are provided, each fixed to one of the four sides of the moving template and positioned directly above the first guide pillars; a guide rod has its lower end positioned above the first ejector plate and passing through the second ejector plate, while its upper end extends into the fixed template; a guide groove is formed below the fixed template; a return spring is sleeved on the guide rod, with one end abutting against the upper part of the second ejector plate and the other end abutting against the guide groove; and a second guide pillar has its lower end bolted to the upper part of a fixed plate, its upper end abutting against the lower part of the fixed template, and slidingly passing through the first and second ejector plates. The micro-vibration component includes: a stroke groove, which is formed on the side template; a micro-vibration groove, which is formed on both sides of the first ejector plate; and a micro-vibration plate, which is slidably embedded in the stroke groove at one end and embedded in the micro-vibration groove at the other end.

[0006] Furthermore, the micro-vibrator also includes: The working chamber is located inside the side template; the first rotating cylinder is fixed on the inner two side walls of the working chamber; the energy storage shaft is rotatably disposed at its end inside the first rotating cylinder; there are two energy storage gears, which are respectively fixed on the energy storage shaft; and the energy storage double torsion spring is fixed at one end on the first rotating cylinder and at the other end on the energy storage gear.

[0007] Furthermore, the micro-vibrator also includes: The second rotating drum is fixed on the inner walls of both sides of the working chamber; the limiting shaft is rotatably disposed inside the second rotating drum; there are two limiting pawls, both of which are fixed on the limiting shaft, and their tips respectively engage with the tooth grooves of the two accumulating gears; one end of the limiting torsion spring is fixed on the second rotating drum, and the other end is fixed on the limiting pawl; the limiting groove is formed on the second rotating drum; and the limiting block is fixed on both ends of the limiting shaft and located in the limiting groove.

[0008] Furthermore, the micro-vibrator also includes: The stroke rod is fixed on the working chamber; there are two stroke plates, which are vertically slidably sleeved on the stroke rod; the stroke gear assembly is fixed on the side of the stroke plate near the power storage gear; the first inclined block assembly is fixed on the side of the stroke plate away from the stroke gear assembly, and the lower inclined surface angle is greater than the upper inclined surface angle.

[0009] Furthermore, the micro-vibrator also includes: The misalignment cylinder is embedded in the side template; the misalignment piston is slidably disposed in the misalignment cylinder; the misalignment spring has one end abutting in the misalignment cylinder and the other end abutting on the misalignment piston; the misalignment rod has one end fixed on the misalignment piston and the other end extending out of the misalignment cylinder; the misalignment plate is fixed on one end extending out of the misalignment cylinder; the second inclined block group is fixed on the misalignment plate, and the inclination angle of the upper inclined surface is greater than the inclination angle of its lower inclined surface. Side ear plates are fixed to the bottom sides of the travel plate; the support spring has its lower end fixed to the bottom of the working chamber and its upper end abutting against the side ear plates.

[0010] Furthermore, the trigger includes: The main liquid chamber is located inside the side template; the main piston is slidably disposed inside the main liquid chamber; the main spring has one end abutting against the bottom of the main liquid chamber and the other end abutting against the main piston; the trigger rod has one end fixed to the main piston and the other end extending out of the side template.

[0011] Furthermore, the trigger also includes: An auxiliary liquid chamber is located within the side template; two limiting posts are provided, one of which is fixed to the top of the auxiliary liquid chamber, and the other is fixed to the bottom of the main liquid chamber; an auxiliary piston is slidably disposed within the auxiliary liquid chamber; a piston rod is fixed at one end to the auxiliary piston and extends slidably into the working chamber at the other end; a main liquid channel is located within the side template, with one end connected to the main liquid chamber and the other end connected to the auxiliary liquid chamber; a tapering channel is located within the main liquid channel; an auxiliary liquid channel is located within the side template and connected to the main liquid channel; a valve groove is located within the auxiliary liquid channel; a valve ball is located within the valve groove; and a return spring has one end abutting against the valve groove and the other end abutting against the valve ball.

[0012] Furthermore, the trigger also includes: A linkage plate is fixed to one end of the piston rod extending into the working chamber; two drive gear plates are provided, both of which are fixed to the linkage plate; two third rotating cylinders are provided, both of which are fixed inside the working chamber; a drive shaft is rotatably disposed at both ends inside the two third rotating cylinders; and two drive gears are provided, both of which are fixed to the drive shaft, meshing with the two drive gear plates on the same side and with the two energy storage gears on the other side.

[0013] Furthermore, the trigger also includes: An unlocking plate is fixed above the drive gear plate; two unlocking rods are provided, which are slidably embedded on both sides of the unlocking plate; an unlocking spring is sleeved on the unlocking rod, with one end abutting against the top of the unlocking rod and the other end abutting against the unlocking plate; a first magnet is fixed below the unlocking rod; and a second magnet is fixed on the limiting pawl.

[0014] Furthermore, it also includes: The first mounting hole is formed on the four sides of the fixed mold base; the second mounting hole is formed on the four sides of the moving mold base; the first mating groove is formed on the four sides of the moving mold plate; four protrusions are provided, and the four protrusions are respectively bolted into the four first mating grooves; the second mating groove is formed on the four sides of the fixed mold plate; four concave blocks are provided, and the four concave blocks are bolted into the second mating grooves; the injection port is formed above the moving mold base.

[0015] The above-described solution of the present invention has at least the following beneficial effects: This invention integrates a trigger and a micro-vibrator within the side mold plate, utilizing the mold closing action itself as a power source. This eliminates the need for an external vibration motor or hydraulic drive, achieving a purely mechanical automatic micro-vibration demolding function. During each mold closing process, the moving mold plate presses down on the trigger rod, converting the closing force into stored elastic potential energy of a double torsion spring via hydraulic transmission. Upon mold opening, this stored energy is released, and through the successive engagement and disengagement of the first inclined block group on the stroke plate and the second inclined block group on the misalignment plate, the continuous rotational motion is converted into intermittent linear displacement, ultimately transmitted to the ejector pin group by the micro-vibration plate. This pause-type upward movement mechanism generates a high-frequency, short-stroke shaft in the ejector pin group in the demolding direction. Micro-vibration periodically creates separation gaps between the product and the fixed and moving mold core plates, breaking the continuous action of vacuum adhesion and static friction from a mechanical perspective. This causes the adhesion interface to repeatedly experience alternating stress from loading and unloading, significantly reducing demolding resistance and eliminating whitening defects. Compared to the traditional constant thrust ejection method, the micro-vibration demolding mechanism decomposes the single static demolding force into a dynamic pulse force sequence, greatly improving the effective demolding function without increasing the peak ejection force. It is especially suitable for easy-to-stick mold conditions such as deep ribs, thin walls, high surface finish, and low shrinkage materials, extending the mold's service life while ensuring product dimensional accuracy and surface quality.

[0016] The trigger mechanism of this invention features a tapered channel and a one-way valve structure within the main hydraulic channel. This design controls the oil return speed during mold opening to be slower than the oil inlet speed during mold closing, creating a natural hydraulic damping delay effect. This ensures that the micro-vibration only starts after the moving mold part has initially separated and the product has been freed from the cavity constraint, preventing micro-vibration from interfering with the mold closing positioning accuracy. Simultaneously, it provides ample action window for the ejector pin assembly's micro-vibration demolding. The entire triggering and micro-vibration mechanism is fully integrated into the side template and working cavity, without occupying external mold space or affecting the existing mold's installation interface and cooling water circuit layout. It can be embedded as a standardized module into injection molds of different specifications, exhibiting excellent versatility and adaptability. The coordinated design of the limiting pawl and the magnetic unlocking mechanism strictly decouples the energy storage and release stages in terms of timing, ensuring consistent energy storage and stable micro-vibration amplitude in each cycle. This avoids inconsistent demolding effects caused by fluctuations in mold closing speed, improving the stability and repeatability of product quality in mass production. Attached Figure Description

[0017] Figure 1 A schematic diagram of the injection mold closing structure of an injection mold with a mechanical micro-vibration demolding mechanism is provided for an embodiment of the present invention; Figure 2 A first-view schematic diagram of the mold separation process for an injection mold with a mechanical micro-vibration demolding mechanism, provided as an embodiment of the present invention; Figure 3 A second-view schematic diagram of the mold separation process for an injection mold with a mechanical micro-vibration demolding mechanism, provided as an embodiment of the present invention; Figure 4 This is a schematic diagram of the first ejector plate structure of an injection mold with a mechanical micro-vibration demolding mechanism, provided in an embodiment of the present invention. Figure 5 A schematic diagram of the ejector pin assembly structure of an injection mold with a mechanical micro-vibration demolding mechanism is provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the fixed template structure of an injection mold with a mechanical micro-vibration demolding mechanism, provided in an embodiment of the present invention. Figure 7 This is a schematic diagram of the trigger rod structure of an injection mold with a mechanical micro-vibration demolding mechanism, provided in an embodiment of the present invention. Figure 8 This is a schematic diagram of the main piston structure of an injection mold with a mechanical micro-vibration demolding mechanism, provided in an embodiment of the present invention. Figure 9 An injection mold with a mechanical micro-vibration demolding mechanism is provided as an embodiment of the present invention. Figure 8 Enlarged view of point A; Figure 10 A cross-sectional view of a side template of an injection mold with a mechanical micro-vibration demolding mechanism provided in an embodiment of the present invention; Figure 11 An injection mold with a mechanical micro-vibration demolding mechanism is provided as an embodiment of the present invention. Figure 10 Enlarged view of point B; Figure 12 This is a schematic diagram of a micro-vibration plate structure for an injection mold with a mechanical micro-vibration demolding mechanism, provided in an embodiment of the present invention. Figure 13 This is a side view of the drive gear of an injection mold with a mechanical micro-vibration demolding mechanism, provided as an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: In the diagram: 1. Fixed mold base; 2. Moving mold base; 3. Fixed plate; 4. Side template; 5. Trigger element; 501. Main liquid chamber; 502. Main piston; 503. Main spring; 504. Trigger rod; 505. Auxiliary liquid chamber; 506. Limiting post; 507. Auxiliary piston; 508. Piston rod; 509. Main liquid channel; 5010. Gradient channel; 5011. Auxiliary liquid channel; 5012. Valve groove; 5013. Valve ball; 5014. Return spring; 5015. Linkage plate; 5 016. Drive gear plate; 5017. Third rotating drum; 5018. Drive shaft; 5019. Drive gear; 5020. Unlocking plate; 5021. Unlocking rod; 5022. Unlocking spring; 5023. First magnet; 5024. Second magnet; 6. Micro-vibration component; 601. Stroke groove; 602. Micro-vibration groove; 603. Micro-vibration plate; 604. Working chamber; 605. First rotating drum; 606. Energy storage shaft; 607. Energy storage gear; 608. Energy storage double torsion spring; 60 9. Second rotating drum; 6010. Limiting shaft; 6011. Limiting pawl; 6012. Limiting torsion spring; 6013. Limiting groove; 6014. Limiting block; 6015. Stroke rod; 6016. Stroke plate; 6017. Stroke gear assembly; 6018. First inclined block assembly; 6019. Displacement cylinder; 6020. Displacement piston; 6021. Displacement spring; 6022. Displacement rod; 6023. Displacement plate; 6024. Second inclined block assembly; 6025. Side ear plate; 60 26. Support spring; 7. First ejector plate; 8. Second ejector plate; 9. Fixed mold plate; 10. Fixed mold core plate; 11. Ejector assembly; 12. Moving mold plate; 13. Moving mold core plate; 14. First guide post; 15. Guide sleeve; 16. Guide rod; 17. Guide groove; 18. Return spring; 19. Second guide post; 20. First mounting hole; 21. Second mounting hole; 22. First mating groove; 23. Protrusion; 24. Second mating groove; 25. Concave block; 26. Injection port. Detailed Implementation

[0019] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0020] like Figures 1 to 13 As shown, an embodiment of the present invention provides an injection mold with a mechanical micro-vibration demolding mechanism, including: a fixed mold base 1 and a movable mold base 2 disposed directly above the fixed mold base 1, and further including: a fixed plate 3, bolted to the fixed mold base 1; two side mold plates 4, each bolted to the upper sides of the fixed plate 3; two sets of trigger elements 5, each located within the two side mold plates 4; two sets of micro-vibration elements 6, each located within the two side mold plates 4; a first ejector plate 7, located above the fixed plate 3; and a second ejector plate 7. The ejector plate 8 is bolted to the top of the first ejector plate 7; the fixed template 9 is bolted to the top of the two side templates 4 on both sides; the fixed mold core plate 10 is embedded in the fixed template 9; the ejector pin assembly 11 has its lower end located above the first ejector plate 7 and passing through the second ejector plate 8, and its upper end extending into the fixed mold core plate 10; the moving template 12 is bolted to the bottom of the moving mold base 2; the moving mold core plate 13 is embedded in the moving template 12; four first guide pillars 14 are provided, with the four first guide pillars 14 located at both ends of the two side templates 4 and passing through the fixed template 9; guide Four sleeves 15 are provided, and the four guide sleeves 15 are respectively fixed on the four sides of the moving template 12 and located directly above the first guide post 14; the guide rod 16 has its lower end located above the first ejector plate 7 and passes through the second ejector plate 8, and its upper end extends into the fixed template 9; the guide groove 17 is opened below the fixed template 9; the return spring 18 is sleeved on the guide rod 16, with one end abutting against the upper part of the second ejector plate 8 and the other end abutting against the guide groove 17; the second guide post 19 has its lower end bolted to the upper part of the fixed plate 3, and its upper end abutting against the fixed template. Below 9, and slidingly passing through the first ejector plate 7 and the second ejector plate 8; the first mounting hole 20 is opened on the four sides of the fixed mold base 1; the second mounting hole 21 is opened on the four sides of the moving mold base 2; the first mating groove 22 is opened on the four sides of the moving mold plate 12; four protrusions 23 are provided, and the four protrusions 23 are respectively bolted into the four first mating grooves 22; the second mating groove 24 is opened on the four sides of the fixed mold plate 9; four concave blocks 25 are provided, and the four concave blocks 25 are bolted into the second mating grooves 24; the injection port 26 is opened above the moving mold base 2.

[0021] Specifically, the fixed mold base 1 is used for mounting and supporting the fixed mold part; the moving mold base 2 is used to drive the moving mold part to complete the mold closing and opening actions; the fixed plate 3 is used to support the ejection mechanism and the side platen 4; the side platen 4 is used to house the trigger element 5 and the micro-vibration element 6 and support the fixed platen 9; the trigger element 5 is used to complete hydraulic transmission and elastic energy storage using the mold closing pressure as power; the micro-vibration element 6 is used to release the stored energy and generate intermittent axial micro-vibration; the first ejector plate 7 and the second ejector plate 8 are used to fix the ejector assembly 11 and transmit the ejection power; the fixed platen 9 is used to fix the fixed mold core plate 10; the fixed mold core plate 10 and the moving mold core plate 13 cooperate to form the injection cavity; the ejector assembly 1 1 is used to eject the molded product from the cavity; 12 is used to fix the moving mold core plate 13; 14 and 15 are used for precise guidance and alignment during the mold closing process; 16 is used for the lifting and lowering guidance of the ejection mechanism; 17 is used to limit the installation and stroke of the return spring 18; 18 is used to provide the return spring force for the ejection mechanism; 19 is used for the sliding guidance of the ejector plate lifting and lowering; 20 and 21 are used for the installation and fixing of the fixed mold and moving mold parts with external equipment, respectively; 23 and 25 are used for auxiliary positioning during mold closing; 26 is used to inject molten material into the cavity.

[0022] In another preferred embodiment of the present invention, the micro-vibration element 6 includes: a stroke groove 601, which is formed on the side template 4; a micro-vibration groove 602, which is formed on both sides of the first ejector plate 7; and a micro-vibration plate 603, one end of which is slidably embedded in the stroke groove 601 and the other end of which is embedded in the micro-vibration groove 602.

[0023] The micro-vibrator 6 also includes: a working chamber 604, formed within the side template 4; a first rotating cylinder 605, fixed to the inner side walls of the working chamber 604; a power storage shaft 606, with its end rotatably disposed within the first rotating cylinder 605; two power storage gears 607, each fixed to the power storage shaft 606; a power storage double torsion spring 608, one end fixed to the first rotating cylinder 605, the other end fixed to the power storage gear 607; and a second rotating cylinder 609, fixed to the inner side walls of the working chamber 604. The positioning shaft 6010 is rotatably mounted inside the second rotating cylinder 609; there are two limiting pawls 6011, both of which are fixed on the limiting shaft 6010, and their tips respectively engage with the tooth grooves of the two accumulator gears 607; one end of the limiting torsion spring 6012 is fixed on the second rotating cylinder 609, and the other end is fixed on the limiting pawl 6011; the limiting groove 6013 is formed on the second rotating cylinder 609; and the limiting block 6014 is fixed on both ends of the limiting shaft 6010 and located inside the limiting groove 6013.

[0024] The micro-vibrator 6 also includes: a stroke rod 6015, fixed to the working chamber 604; two stroke plates 6016, which are vertically slidably sleeved on the stroke rod 6015; a stroke gear set 6017, fixed on the side of the stroke plate 6016 near the storage gear 607; a first inclined block set 6018, fixed on the side of the stroke plate 6016 away from the stroke gear set 6017, with the lower inclined surface angle greater than the upper inclined surface angle; a misalignment cylinder 6019, embedded in the side template 4; a misalignment piston 6020, slidably disposed in the misalignment cylinder 6019; and a misalignment spring 6021. One end of the misalignment rod 6022 is fixed to the misalignment cylinder 6019, and the other end extends out of the misalignment cylinder 6019; the misalignment plate 6023 is fixed to one end of the extension out of the misalignment cylinder 6019; the second inclined block group 6024 is fixed to the misalignment plate 6023, and the inclination angle of the upper inclined surface is greater than that of the lower inclined surface; the side ear plate 6025 is fixed to the bottom sides of the stroke plate 6016; the support spring 6026 has its lower end fixed to the bottom of the working chamber 604, and its upper end abutting against the side ear plate 6025.

[0025] Specifically, the stroke groove 601 is used to limit the sliding stroke of the micro-vibration plate 603; the micro-vibration groove 602 is used to receive vibration transmission; the micro-vibration plate 603 is used to transmit intermittent vibration to the ejector plate; the working cavity 604 is used to accommodate the micro-vibration functional components; the first rotating cylinder 605 is used to support the rotation of the energy storage shaft 606; the energy storage shaft 606 is used to carry the energy storage gear 607 and transmit torsional force; the energy storage gear 607 is used to receive the driving force and torsion the energy storage double torsion spring 608 to complete energy storage; the energy storage double torsion spring 608 is used for... The system stores and releases elastic potential energy to provide micro-vibration force; the second rotating drum 609 supports the rotation of the limiting shaft 6010; the limiting shaft 6010 carries the limiting pawl 6011; the limiting pawl 6011 is used to lock the energy storage gear 607 in one direction to prevent energy release during the energy storage phase; the limiting torsion spring 6012 provides reset torque to the limiting pawl 6011 to maintain the locked state; the limiting groove 6013 limits the rotation range of the limiting block 6014; the limiting block 6014 restricts the rotation of the limiting shaft 6010. The rotation angle is 10; the stroke rod 6015 provides a sliding guide for the stroke plate 6016; the stroke plate 6016 drives the inclined block structure to complete the lifting motion; the stroke gear set 6017 meshes with the energy storage gear 607 to convert the rotational motion into linear motion; the first inclined block set 6018 cooperates with the corresponding inclined block to produce intermittent pause displacement; the misalignment cylinder 6019 accommodates the misalignment piston 6020 and the misalignment spring 6021; the misalignment piston 6020 drives the misalignment rod 6022. Telescopic sliding; misalignment spring 6021 is used to provide reset elastic force for the misalignment structure; misalignment rod 6022 is used to transmit the telescopic movement of misalignment plate 6023; misalignment plate 6023 is used to support the second inclined block group 6024; the second inclined block group 6024 is used to cooperate with the first inclined block group 6018 to convert continuous lifting and lowering into intermittent vibration; side ear plate 6025 is used to bear the elastic force of support spring 6026; support spring 6026 is used to support stroke plate 6016 to ensure accurate initial engagement position.

[0026] In another preferred embodiment of the present invention, the trigger 5 includes: a main liquid chamber 501, which is formed within the side template 4; a main piston 502, which is slidably disposed within the main liquid chamber 501; a main spring 503, one end of which abuts against the bottom of the main liquid chamber 501 and the other end of which abuts against the main piston 502; a trigger rod 504, one end of which is fixed to the main piston 502 and the other end of which extends out of the side template 4; an auxiliary liquid chamber 505, which is formed within the side template 4; two limiting posts 506, one of which is fixed to the top of the auxiliary liquid chamber 505 and the other of which is fixed to the bottom of the main liquid chamber 501; and an auxiliary piston 507, which is slidably disposed within the side template 4. The auxiliary liquid chamber 505 contains a piston rod 508, one end of which is fixed to the auxiliary piston 507, and the other end of which slides into the working chamber 604; a main liquid channel 509 is opened in the side template 4, one end of which is connected to the main liquid chamber 501, and the other end of which is connected to the auxiliary liquid chamber 505; a tapering channel 5010 is opened in the main liquid channel 509; an auxiliary liquid channel 5011 is opened in the side template 4 and is connected to the main liquid channel 509; a valve groove 5012 is opened in the auxiliary liquid channel 5011; a valve ball 5013 is located in the valve groove 5012; and a return spring 5014 is abutted in the valve groove 5012 at one end and abutted on the valve ball 5013 at the other end.

[0027] The trigger element 5 also includes: a linkage plate 5015, fixed to one end of the piston rod 508 extending into the working chamber 604; two drive gear plates 5016, both fixed to the linkage plate 5015; two third rotating cylinders 5017, both fixed to the working chamber 604; a drive shaft 5018, rotatably mounted at both ends within the two third rotating cylinders 5017; and two drive gears 5019, both fixed to the drive shaft 5018 and connected to the two cylinders on the same side. One drive gear plate 5016 meshes with the other side, and the other side meshes with two energy storage gears 607; the unlocking plate 5020 is fixed above the drive gear plate 5016; there are two unlocking rods 5021, which are slidably embedded on both sides of the unlocking plate 5020; the unlocking spring 5022 is sleeved on the unlocking rod 5021, with one end abutting above the unlocking rod 5021 and the other end abutting on the unlocking plate 5021; the first magnet 5023 is fixed below the unlocking rod 5021; the second magnet 5024 is fixed on the limiting pawl 6011.

[0028] Specifically, the main hydraulic chamber 501 is used to contain hydraulic oil and the main piston 502; the main piston 502 is used to compress the hydraulic oil and convert the mold closing pressure into hydraulic power; the main spring 503 is used to provide the main piston 502 with a return spring force; the trigger rod 504 is used to bear the mold closing pressure and push the main piston 502 to move; the auxiliary hydraulic chamber 505 is used to contain hydraulic oil and push the auxiliary piston 507 to move; the limiting post 506 is used to limit the limit stroke of the main piston 502 and the auxiliary piston 507; the auxiliary piston 507 is used to drive the piston rod 508 to extend and retract under hydraulic drive; the piston rod 508 is used as a transmission structure to transmit hydraulic power to the working chamber 604; the main hydraulic channel 509 is used to connect the main hydraulic chamber 501 and the auxiliary hydraulic chamber 505; the tapered channel 5010 is used to throttle and limit the flow, controlling the hydraulic oil return speed; the auxiliary hydraulic channel 5011 is used to bypass the oil circuit to achieve unidirectional rapid oil inlet; the valve groove 5012 is used to contain the valve ball 5013 and the return spring 5014; the valve Ball 5013 is used to realize unidirectional flow and reverse cut-off of hydraulic oil; return spring 5014 is used to push valve ball 5013 to reset and maintain the cut-off state; linkage plate 5015 is used to synchronously drive two sets of drive gear plates 5016 to rise and fall; drive gear plate 5016 is used to mesh with drive gear 5019 to convert linear motion into rotational motion; third rotating cylinder 5017 is used to support the rotation of drive shaft 5018; drive shaft 5018 is used to carry drive gear 5019 and transmit torsional power; drive gear 5019 is used to transmit power to energy storage gear 607 to complete energy storage; unlocking plate 5020 is used to carry the unlocking structure and rise and fall with drive gear plate 5016; unlocking rod 5021 is used to drive first magnet 5023 to complete the unlocking action; unlocking spring 5022 is used to provide extension and retraction force and reset force for unlocking rod 5021; first magnet 5023 and second magnet 5024 are used to achieve magnetic unlocking of limit pawl 6011 through magnetic attraction.

[0029] The fixed mold base 1 is installed on the worktable through the first mounting hole 20, and the moving mold base 2 is installed on the telescopic end of the lifting system through the second mounting hole 21. The injection port 26 is connected to the molten material interface. When the lifting system drives the moving mold base 2 to descend, the moving mold base 2, the moving template 12 and the moving mold core plate 13 move downward synchronously. The first guide post 14 on the side template 4 and the guide sleeve 15 on the moving template 12 complete the guiding connection. Then the moving mold part and the fixed mold part are pressed into place. The molten material is injected into the cavity between the fixed mold core plate 10 and the moving mold core plate 13 through the injection port 26. After the molten material cools and solidifies, the lifting system drives the moving mold part to rise and separate, completing one injection cycle.

[0030] During the downward movement of the moving mold section, the moving mold plate 12 first presses against the trigger rod 504. The trigger rod 504 transmits pressure to the main piston 502. The main piston 502 moves downward in the main hydraulic chamber 501 and compresses the main spring 503, while simultaneously squeezing the hydraulic oil in the main hydraulic chamber 501. The hydraulic oil flows sequentially through the main hydraulic channel 509, the converging channel 5010, and the auxiliary hydraulic channel 5011 into the auxiliary hydraulic chamber 505. During the flow, the hydraulic oil pushes open the valve ball 5013 in the valve groove 5012 in the auxiliary hydraulic channel 5011. The valve ball 5013 compresses the return spring 5014 to open the passage, and the hydraulic oil flows smoothly and quickly into the auxiliary hydraulic chamber 505.

[0031] Hydraulic oil enters the auxiliary fluid chamber 505, pushing the auxiliary piston 507 to move. The auxiliary piston 507 drives the piston rod 508 to extend into the working chamber 604. The piston rod 508 drives the drive gear plate 5016 to move downward through the linkage plate 5015. The lower teeth of the drive gear plate 5016 mesh with the drive gear 5019, causing the drive gear 5019 to rotate in the forward direction. The drive gear 5019 transmits the rotation to the energy storage gear 607 through the drive shaft 5018. When the energy storage gear 607 rotates in the reverse direction, it tightens the energy storage double torsion spring 608 to store energy. At the same time, the limiting pawl 6011 is always engaged under the action of the limiting torsion spring 6012. The lever 5020 rests against the tooth groove of the accumulator gear 607, preventing the accumulator gear 607 from rotating forward. At this time, the reverse rotation of the accumulator gear 607 does not mesh with the travel gear set 6017 on the travel plate 6016. When the drive gear plate 5016 moves down to its full position, the unlocking plate 5020 moves down to a position close to the limit pawl 6011. Since the torque of the limit torsion spring 6012 is greater than the elastic force of the unlocking spring 5022, the first magnet 5023 and the second magnet 5024 are attracted. The first magnet 5023 only drives the unlocking rod 5021 to move down slightly, and the limit pawl 6011 remains locked to the accumulator gear 607.

[0032] After injection molding is completed, the moving mold part begins to move upward and separate. The main spring 503 releases its elastic force to push the main piston 502 and the trigger rod 504 to return upward. A negative pressure is formed in the main liquid chamber 501, and hydraulic oil is drawn back from the auxiliary liquid chamber 505. At this time, the valve ball 5013 in the auxiliary liquid channel 5011 blocks the valve groove 5012 under the action of the return spring 5014 and the reverse hydraulic pressure. The hydraulic oil can only flow back slowly through the main liquid channel 509. This throttling effect makes the upward recovery speed of the auxiliary piston 507 slower, and the reset speed of the main piston 502 and the trigger rod 504 slower, leaving enough time for the reset action of the micro-vibration plate 603.

[0033] As the auxiliary piston 507 slowly moves upward, the piston rod 508 drives the linkage plate 5015, drive gear plate 5016, and unlocking plate 5020 to move upward synchronously. Since the first magnet 5023 and the second magnet 5024 are in an attracted state, the unlocking plate 5020 initially moves upward, and the magnetic force of the first magnet 5023 and the elastic force of the unlocking spring 5022 pull the limiting pawl 6011 away from the power storage gear 607. The power storage double torsion spring 608 then releases torque to drive the power storage gear 607 to rotate in the forward direction.

[0034] The forward rotation of the accumulator gear 607 meshes with the stroke gear set 6017, causing the stroke plate 6016 to move upward along the stroke rod 6015. At the same time, the stroke plate 6016 drives the first slant block set 6018 to move upward. Meanwhile, the drive gear 5019 is located in the toothless area above the drive gear plate 5016 and is in an idle state, no longer constraining the speed and direction of the accumulator gear 607.

[0035] During the upward movement of the travel plate 6016, the upper inclined surface of the first inclined block group 6018 comes into contact with the lower inclined surface of the second inclined block group 6024 on the misalignment plate 6023 in turn. Each time the second inclined block group 6024 passes through an inclined block, it is pushed upward, causing the misalignment plate 6023, misalignment rod 6022 and misalignment piston 6020 to retract into the misalignment cylinder 6019 and compress the misalignment spring 6021, thus causing the stroke plate 6016 to pause briefly. After the inclined blocks are misaligned, the misalignment spring 6021 pushes the misalignment piston 6020 to reset, and the stroke plate 6016 continues to move upward to the next inclined block and pauses again. This intermittent upward movement is transmitted to the first ejector plate 7 and the second ejector plate 8 through the micro-vibration plate 603, causing the ejector pin group 11 to generate axial micro-vibration. The micro-vibration periodically creates tiny gaps between the product and the fixed mold core plate 10 and the moving mold core plate 13, destroying vacuum adsorption and static friction, effectively reducing ejection whitening, and is especially suitable for demolding products with deep ribs, thin walls and easy sticking.

[0036] After the energy storage gear 607 has finished rotating forward and releasing its energy, the drive gear plate 5016 continues to move upward until the lower tooth section re-engages with the drive gear 5019. The drive gear 5019 rotates in the opposite direction and drives the energy storage gear 607 to rotate forward again. At this time, the limit pawl 6011 is still in the disengaged state. The forward rotation of the energy storage gear 607 re-tightens the energy storage double torsion spring 608 for secondary energy storage. The forward rotation direction does not mesh with the stroke gear set 6017. The stroke gear set 6017 of the stroke plate 6016 remains above the energy storage gear 607 and is unaffected. When the drive gear plate 5016 passes the toothed section and enters the toothless area at the bottom, the power-storing double torsion spring 608 releases torque again to drive the power-storing gear 607 to rotate in the opposite direction. At this time, the drive gear 5019 idles in the toothless area. Under the weight of the stroke plate 6016 itself, the reverse-rotating power-storing gear 607 meshes with the stroke gear set 6017 of the stroke plate 6016. The power-storing gear 607 drives the stroke plate 6016 and the stroke gear set 6017 to reset downwards. The first wedge block set 6018 and the second wedge block set 6024 gradually disengage until the stroke plate 6016 returns to its initial position, and the torque of the power-storing double torsion spring 608 is also released.

[0037] As the drive gear plate 5016 is about to fully reset, the unlocking spring 5022 is compressed to its limit. The unlocking plate 5020 applies sufficient tension to the unlocking rod 5021 through the compressed unlocking spring 5022, causing the first magnet 5023 to overcome the magnetic attraction and separate from the second magnet 5024. The limiting pawl 6011, under the action of the limiting torsion spring 6012, re-engages with the storage gear 607. The rotation range of the limiting shaft 6010 is limited by the stroke of the limiting block 6014 within the limiting groove 6013. After separation, the unlocking spring 5022 drives the unlocking rod 5021 and the first magnet 5023 to reset, the drive gear plate 5016 also returns to its initial position, and the trigger 5 and the micro-vibration element 6 all return to their original positions. The support spring 6026 supports the stroke plate 6016 via the side ear plate 6025. When the stroke gear set 6017 of the stroke plate 6016 is located below the accumulator gear 607, the uppermost tooth of the stroke gear set 6017 abuts against the lower tooth of the accumulator gear 607, ensuring accurate meshing during the next triggering. Each mold closing action repeats the above triggering and micro-vibration process, achieving automatic cyclic operation.

[0038] By integrating the trigger element 5 and the micro-vibration element 6 within the side template 4, and utilizing the mold closing action itself as a power source, a purely mechanical automatic micro-vibration demolding function is achieved without the need for an external vibration motor or hydraulic drive device. During each mold closing process, the moving template 12 presses down the trigger rod 504, converting the mold closing force into the elastic potential energy of the stored double torsion spring 608 through hydraulic transmission. When the mold opens, the stored energy is released, and through the successive meshing of the first inclined block group 6018 on the stroke plate 6016 and the second inclined block group 6024 on the misalignment plate 6023... The combination and separation transform the continuous rotational motion into intermittent linear displacement, which is ultimately transmitted to the ejector pin assembly 11 by the micro-vibration plate 603. This pause-type upward mechanism causes the ejector pin assembly 11 to generate high-frequency, short-stroke axial micro-vibration in the demolding direction, periodically creating separation gaps between the product and the fixed mold core plate 10 and the moving mold core plate 13. From a mechanical perspective, this breaks the continuous action of vacuum adsorption force and static friction force, causing the adhesion interface to repeatedly experience alternating stress of loading and unloading, significantly reducing demolding resistance and eliminating whitening defects.

[0039] Compared to the traditional constant thrust ejection method, the micro-vibration demolding mechanism decomposes the single static demolding force into a dynamic pulse force sequence, which greatly improves the effective demolding power without increasing the peak ejection force. It is especially suitable for easy-to-stick mold conditions such as deep ribs, thin walls, high surface finish and low shrinkage materials, and extends the service life of the mold while ensuring the dimensional accuracy and surface quality of the product.

[0040] The main hydraulic channel 509 of the trigger 5 is equipped with a tapered channel 5010 and a one-way valve structure, which controls the oil return speed during mold opening to be slower than the oil inlet speed during mold closing, forming a natural hydraulic damping delay effect. This ensures that the micro-vibration only starts after the moving mold part has initially separated and the product has been freed from the cavity constraint, avoiding interference with the mold closing positioning accuracy. At the same time, it provides sufficient action window for the micro-vibration demolding of the ejector pin group 11. The entire trigger and micro-vibration mechanism is completely built into the side platen 4 and the working cavity 604, without occupying external mold space or affecting the existing mold installation interface and cooling water circuit layout. It can be embedded as a standardized module in injection molds of different specifications, with good versatility and adaptability. The design of the limit pawl 6011 and the magnet unlocking mechanism strictly decouples the energy storage and release stages in terms of timing, ensuring consistent energy storage and stable micro-vibration amplitude in each cycle. This avoids inconsistent demolding effects caused by fluctuations in mold closing speed, improving the stability and repeatability of product quality in mass production.

[0041] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An injection mold with mechanical microvibrational demolding mechanism, comprising: The fixed mold base and the movable mold base disposed directly above the fixed mold base are characterized in that they further include: A fixed plate is bolted to the top of the fixed mold base; two side mold plates are provided, each bolted to the top of one side of the fixed plate; two sets of trigger elements are provided, each located within one of the two side mold plates; two sets of micro-vibration elements are provided, each located within one of the two side mold plates; a first ejector plate is located above the fixed plate; a second ejector plate is bolted to the top of the first ejector plate; a fixed mold plate is bolted to the top of the two side mold plates on both sides; a fixed mold core plate is embedded within the fixed mold plate; an ejector pin assembly has its lower end located above the first ejector plate and passing through the second ejector plate, with its upper end extending into the fixed mold core plate; a moving mold plate is bolted to the bottom of the moving mold base; and a moving mold core plate is embedded within the moving mold base. Within the moving template: four first guide pillars are provided, each located at one end of a side template and passing through a fixed template; four guide sleeves are provided, each fixed to one of the four sides of the moving template and positioned directly above the first guide pillars; a guide rod has its lower end positioned above the first ejector plate and passing through the second ejector plate, while its upper end extends into the fixed template; a guide groove is formed below the fixed template; a return spring is sleeved on the guide rod, with one end abutting against the upper part of the second ejector plate and the other end abutting against the guide groove; and a second guide pillar has its lower end bolted to the upper part of a fixed plate, its upper end abutting against the lower part of the fixed template, and slidingly passing through the first and second ejector plates. The micro-vibration component includes: a stroke groove, which is formed on the side template; a micro-vibration groove, which is formed on both sides of the first ejector plate; and a micro-vibration plate, which is slidably embedded in the stroke groove at one end and embedded in the micro-vibration groove at the other end.

2. The injection mold with mechanical micro-vibration demolding mechanism according to claim 1, characterized in that, The micro-vibrator also includes: The working chamber is located inside the side template; the first rotating cylinder is fixed on the inner two side walls of the working chamber; the energy storage shaft is rotatably disposed at its end inside the first rotating cylinder; there are two energy storage gears, which are respectively fixed on the energy storage shaft; and the energy storage double torsion spring is fixed at one end on the first rotating cylinder and at the other end on the energy storage gear.

3. An injection mold with mechanical micro-release mechanism according to claim 2, characterized in that, The micro-vibrator also includes: The second rotating drum is fixed on the inner walls of both sides of the working chamber; the limiting shaft is rotatably disposed inside the second rotating drum; there are two limiting pawls, both of which are fixed on the limiting shaft, and their tips respectively engage with the tooth grooves of the two accumulating gears; one end of the limiting torsion spring is fixed on the second rotating drum, and the other end is fixed on the limiting pawl; the limiting groove is formed on the second rotating drum; and the limiting block is fixed on both ends of the limiting shaft and located in the limiting groove.

4. The injection mold with a mechanical micro-vibration demolding mechanism according to claim 3, characterized in that, The micro-vibrator also includes: The stroke rod is fixed on the working chamber; there are two stroke plates, which are vertically slidably sleeved on the stroke rod; the stroke gear assembly is fixed on the side of the stroke plate near the power storage gear; the first inclined block assembly is fixed on the side of the stroke plate away from the stroke gear assembly, and the lower inclined surface angle is greater than the upper inclined surface angle.

5. An injection mold with a mechanical micro-vibration demolding mechanism according to claim 4, characterized in that, The micro-vibrator also includes: The misalignment cylinder is embedded in the side template; the misalignment piston is slidably disposed in the misalignment cylinder; the misalignment spring has one end abutting in the misalignment cylinder and the other end abutting on the misalignment piston; the misalignment rod has one end fixed on the misalignment piston and the other end extending out of the misalignment cylinder; the misalignment plate is fixed on one end extending out of the misalignment cylinder; the second inclined block group is fixed on the misalignment plate, and the inclination angle of the upper inclined surface is greater than the inclination angle of its lower inclined surface. Side ear plates are fixed to the bottom sides of the travel plate; the support spring has its lower end fixed to the bottom of the working chamber and its upper end abutting against the side ear plates.

6. The injection mold with a mechanical micro-vibration demolding mechanism according to claim 5, characterized in that, The trigger includes: The main liquid chamber is located inside the side template; the main piston is slidably disposed inside the main liquid chamber; the main spring has one end abutting against the bottom of the main liquid chamber and the other end abutting against the main piston; the trigger rod has one end fixed to the main piston and the other end extending out of the side template.

7. An injection mold with a mechanical micro-vibration demolding mechanism according to claim 6, characterized in that, The trigger also includes: An auxiliary liquid chamber is located within the side template; two limiting posts are provided, one of which is fixed to the top of the auxiliary liquid chamber, and the other is fixed to the bottom of the main liquid chamber; an auxiliary piston is slidably disposed within the auxiliary liquid chamber; a piston rod is fixed at one end to the auxiliary piston and extends slidably into the working chamber at the other end; a main liquid channel is located within the side template, with one end connected to the main liquid chamber and the other end connected to the auxiliary liquid chamber; a tapering channel is located within the main liquid channel; an auxiliary liquid channel is located within the side template and connected to the main liquid channel; a valve groove is located within the auxiliary liquid channel; a valve ball is located within the valve groove; and a return spring has one end abutting against the valve groove and the other end abutting against the valve ball.

8. The injection mold with a mechanical micro-vibration demolding mechanism according to claim 7, characterized in that, The trigger also includes: A linkage plate is fixed to one end of the piston rod extending into the working chamber; two drive gear plates are provided, both of which are fixed to the linkage plate; two third rotating cylinders are provided, both of which are fixed inside the working chamber; a drive shaft is rotatably disposed at both ends inside the two third rotating cylinders; and two drive gears are provided, both of which are fixed to the drive shaft, meshing with the two drive gear plates on the same side and with the two energy storage gears on the other side.

9. An injection mold with a mechanical micro-vibration demolding mechanism according to claim 8, characterized in that, The trigger also includes: An unlocking plate is fixed above the drive gear plate; two unlocking rods are provided, which are slidably embedded on both sides of the unlocking plate; an unlocking spring is sleeved on the unlocking rod, with one end abutting against the top of the unlocking rod and the other end abutting against the unlocking plate; a first magnet is fixed below the unlocking rod; and a second magnet is fixed on the limiting pawl.

10. An injection mold with a mechanical micro-vibration demolding mechanism according to claim 1, characterized in that, Also includes: The first mounting hole is formed on the four sides of the fixed mold base; the second mounting hole is formed on the four sides of the moving mold base; the first mating groove is formed on the four sides of the moving mold plate; four protrusions are provided, and the four protrusions are respectively bolted into the four first mating grooves; the second mating groove is formed on the four sides of the fixed mold plate; four concave blocks are provided, and the four concave blocks are bolted into the second mating grooves; the injection port is formed above the moving mold base.

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