An injection mold with internal parting

Abstract

The application discloses an inner-dividing injection mold, and relates to the technical field of mold injection, which comprises an upper mold assembly, a lower mold assembly is assembled below the upper mold assembly, an injection pipeline for conveying injection liquid is arranged above the upper mold assembly, a dynamic double-adjusting mechanism is arranged below the lower mold assembly, the dynamic double-adjusting mechanism comprises assembled through pipes which are symmetrically distributed below the injection pipeline, and a size-diameter adjusting piece is arranged in each assembled through pipe, the size-diameter adjusting piece comprises a plurality of adaptive sliding blocks which can synchronously move, when the injection liquid suddenly increases in pressure, the plurality of adaptive sliding blocks can synchronously move away from the center of the flow channel and switch to an extended state, so that the local flow channel in the assembled through pipe is temporarily expanded, the process can quickly release the suddenly increased pressure, defects such as overflow and turbulent flow caused by the excessively high pressure are avoided, and the filling speed of the injection liquid in the complex flow channel is balanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mold injection, in particular to an inner parting injection mold. BACKGROUND

[0002] The inner parting injection refers to a mold technology for manufacturing plastic parts with complex internal structure in plastic injection molding. The inner parting hides the parting clamp line on the non-appearance surface of the product, so that the parting clamp line cannot be seen after assembly on the whole vehicle, thereby not affecting the appearance. In order to realize this function, the horizontal inclined top or straight top is controlled to run on the second rail by rail technology on the mold structure, so as to ensure the deformation demolding of the plastic part. The mechanism controlled by this second rail technology is called inner parting technology.

[0003] However, the prior art still has the following defects in specific use: 1. Compared with the prior art, the inner parting injection mold is the core reason for the difficulty of injection molding process control due to the relatively complex cavity structure. The cavity has a plurality of special-shaped cavities, complex ribs or irregular curved surfaces. During the filling process of the plastic melt, the melt needs to flow through multiple turning regions, and the flow path is tortuous, so that the melt flow resistance is significantly greater than that of ordinary molds. At the same time, due to the differences in wall thickness and heat dissipation conditions of different areas of the cavity, such as thicker wall thickness and slower heat dissipation in some areas, and thinner wall thickness and faster heat dissipation in some areas, the cooling speed and shrinkage of the melt in different areas are obviously different. This difference requires high synergy of process parameters. The injection pressure needs to accurately match the flow resistance of different areas. If the pressure is insufficient, it will easily lead to poor filling, and if the pressure is too high, it may cause overflow. The injection speed needs to match the melt viscosity and cavity structure. Too fast speed can easily produce turbulent flow, and too slow speed can cause the melt to cool too early and appear filling faults.

[0004] Due to the difficulty of parameter control, a large amount of time is spent on trial molding before production. The injection pressure, speed, temperature and other parameters are repeatedly adjusted, which not only prolongs the production preparation period, but also increases the raw material loss and equipment energy consumption in the trial molding process. From the product quality point of view, if the parameter control is slightly deviated, it is easy to appear filling deficiency, shrinkage, deformation and other defects. The filling deficiency will lead to incomplete product shape, which will directly become unqualified products. Shrinkage often occurs in areas with thick wall thickness, which not only affects the appearance, but also may weaken the local structural strength of the product. Deformation will cause the product size precision to exceed the design tolerance range. Especially for high-precision parts such as electronic component housings and automobile precision parts, size deviation will make them unable to be normally assembled and lose the use function.

[0005] 2、Meanwhile, the gas is easy to be trapped in the cavity during the injection molding process of the inner parting injection mold, mainly due to the special parting structure and the limitation of the exhaust design. The parting surface of the inner parting mold is usually located inside the product, rather than the traditional outer parting, which greatly limits the setting of the exhaust channel and makes it difficult to reasonably layout enough exhaust grooves in the key exhaust area. When the plastic melt fills the cavity, the melt will push forward at a certain speed, which will squeeze the air inside the cavity. Due to the blockage of the inner parting structure, the air is difficult to be discharged through the limited exhaust channel, especially in the corners of the cavity, the bottom of the deep cavity and the closed area where the rib connects to the main body. The air is more likely to be wrapped by the melt, forming an accumulated space that cannot be discharged.

[0006] The gas trapped in the cavity will seriously affect the product quality and use performance, and bring many losses to the enterprise. From the product appearance and structure, the gas trapped in the cavity cannot be discharged, which will form bubbles and cavities inside the product. These defects not only destroy the integrity of the product appearance, but also cause uneven product structure. For products that bear load, such as mechanical parts, internal bubbles and cavities will become stress concentration points, which will greatly reduce the mechanical properties of the product, including strength, toughness and impact resistance. This makes the product prone to failure such as cracking and deformation during use, shortens the service life, and if the product is used in a sealed scene, such as pipe joints, container covers, etc., internal cavities may also cause the sealing performance to decline and cause leakage problems.

[0007] Therefore, in view of the above, the present application provides an inner parting injection mold to make up for and improve the shortcomings of the prior art. SUMMARY

[0008] To solve the above technical problems, the present application provides an inner parting injection mold to solve the technical problems raised in the background art.

[0009] To achieve the above object, the technical scheme adopted by the present application is as follows: an inner parting injection mold, comprising an upper mold set, a lower mold set is assembled below the upper mold set, an injection pipeline for conveying injection liquid is arranged above the upper mold set, a dynamic double-adjusting mechanism is arranged below the lower mold set, the dynamic double-adjusting mechanism comprises assembly through pipes which are symmetrically distributed below the injection pipeline, and a size adjusting piece is installed inside each assembly through pipe, the size adjusting piece comprises a plurality of adaptive sliding blocks which can act synchronously; during the setting injection process, the size adjusting piece can adaptively switch two operating modes according to the actual pressure change of the injection liquid in the flow channel: when the pressure of the injection liquid suddenly rises due to abnormal flow, the plurality of adaptive sliding blocks will synchronously move away from the center of the flow channel, switch to the stretched state, and through the action, the local flow channel in the assembly through pipe is stretched and temporarily enlarged, so as to realize pressure compensation, relieve the suddenly rising pressure and balance the filling speed of the injection liquid in the flow channel; on the contrary, when the pressure of the injection liquid suddenly decreases due to abnormal flow, the plurality of adaptive sliding blocks will synchronously move close to the center of the flow channel, switch to the contracted state, extrude the local flow channel in the assembly through pipe to temporarily reduce the size, and through reducing the flow channel volume, realize pressure compensation, avoid the filling speed of the injection liquid slowing down or not being filled due to insufficient pressure, and further ensure the stability of the overall injection liquid filling speed.

[0010] Further, the dynamic double-adjusting mechanism further comprises a driving cylinder, an output end outer wall of the driving cylinder is fixedly connected with a linkage inclined plate, linkage inclined plates are symmetrically installed on both sides of the linkage inclined plate, the linkage inclined plates are in sliding connection with the lower mold set, and one side of the linkage inclined plates close to each other is fixedly connected with a touch shaft, and the touch shaft is located on the movement path of the linkage inclined plate.

[0011] Further, one side of the linkage inclined plates away from each other is fixedly connected with a limiting sliding shaft, a reset spring is sleeved on the outer wall of the limiting sliding shaft, and the two ends of the reset spring are fixedly connected with the linkage inclined plate and the lower mold set respectively.

[0012] Further, the assembly through pipe is in whole L-shaped, the vertical part of the assembly through pipe is in communication with the injection pipeline, and the output end of the horizontal part corresponds to the injection position of the mold set, and the size adjusting piece is installed at the vertical part of the assembly through pipe.

[0013] Further, the size-diameter adjusting member comprises two upper and lower groove rings, which provide guidance and limitation for the radial movement of the plurality of adaptive sliding blocks, and the plurality of adaptive sliding blocks are in sliding connection with the groove rings, the outer side of the groove ring is fixedly connected with a connected elastic cable, meanwhile, the outer wall of the plurality of adaptive sliding blocks is provided with a concave ring groove corresponding to the position of the connected elastic cable, the connected elastic cable is embedded in the concave ring groove, so that the plurality of adaptive sliding blocks are integrally connected through the connected elastic cable, when the injection pressure changes to drive the adaptive sliding block to slide along the groove ring, the connected elastic cable can utilize its elasticity to provide elastic constraint when the sliding block expands and enlarges the flow channel, and assists the sliding block to reset when it shrinks, so as to ensure the stability and controllability of the size-diameter adjusting process.

[0014] Further, the groove rings are fixedly connected with a butt joint pipe, the butt joint pipe is in the shape of a corrugated circular ring as a whole, and the outer wall of the butt joint pipe is provided with a connecting square plate, which is in fixed connection with the adjusting plate block.

[0015] Further, the connecting square plate is in the shape of C as a whole, and the upper and lower ends thereof are in fixed connection with the adaptive sliding blocks distributed above and below, respectively, so as to build a rigid linkage relationship between the adaptive sliding blocks and the connecting square plate, and ensure that the displacement movement of the adaptive sliding blocks can be effectively transmitted through the connecting square plate, and a clamping plate is fixedly connected at the center position of the connecting square plate, which is a key connection medium and enables the connecting square plate and the butt joint pipe to be stably assembled.

[0016] Further, the sides of the adjusting plate blocks away from each other are fixedly connected with fixed bottom plates, the surfaces of the fixed bottom plates are symmetrically provided with trigger sliding rods, the outer walls of the trigger sliding rods are slidably connected with communication curved pipes, the ends of the communication curved pipes away from the trigger sliding rods are communicated with nozzle embedded pipes, and the output ends of the nozzle embedded pipes correspond to the positions of the exhaust holes provided between the mold groups.

[0017] Further, the ends of the trigger sliding rods close to the fixed bottom plates are fixedly connected with spherical balls, the trigger sliding rods and the fixed bottom plates are in universal movable connection through the spherical balls, the ends of the trigger sliding rods away from the fixed bottom plates are in the shape of a cone, and the output ends of the nozzle embedded pipes are also in the shape of a cone, both of which are designed with the same taper, and the diameter of the cone at the end of the trigger sliding rod is slightly larger than the diameter of the conical hole at the end of the nozzle embedded pipe, so as to form a nested cooperation of outer cone and inner cone.

[0018] Further, the radius ratio of the communication curved pipe to the nozzle embedded pipe is two to one, the communication curved pipe is in the shape of T as a whole, and the vertical part of the communication curved pipe is provided with a valve group, the valve group is composed of two upper and lower one-way valves, in the initial state, the upper one-way valve is in the open state, and the lower one-way valve is in the closed state.

[0019] Compared with the prior art, the beneficial effects of the present application are: (1) The device effectively solves the problem of pressure fluctuation caused by complex cavity in the inner parting injection mold through the dynamic adjustment of the adaptive slider. When the injection liquid pressure rises suddenly, several adaptive sliders can move synchronously away from the center of the runner and switch to the extended state, temporarily expanding the local runner in the assembly pipe, which quickly releases the sudden pressure rise and avoids defects such as overflow and turbulence caused by excessive pressure. At the same time, it balances the filling speed of the injection liquid in the complex runner, ensures that the melt can flow smoothly through the turning area and special-shaped structure of the cavity, and adapts to the flow resistance difference of different areas without repeated adjustment of injection pressure parameters, significantly reducing the process control difficulty.

[0020] When the injection liquid pressure drops suddenly, several adaptive sliders will move synchronously towards the center of the runner and switch to the contracted state, and the volume of the local runner is reduced by extrusion to compensate for the pressure. This process can effectively avoid problems such as slow filling speed and incomplete filling caused by insufficient pressure, ensuring that the injection liquid fills each area of the cavity continuously and stably, including areas with thick walls and slow heat dissipation, reducing filling faults caused by early cooling of the melt. At the same time, the synchronous action of the adaptive slider relies on the guidance of the groove ring cylinder, the constraint of the connected elastic cable and the rigid transmission of the connecting plate, ensuring stable and controllable adjustment process, further improving product forming quality, reducing defects such as shrinkage and deformation, and ensuring the dimensional accuracy and assembly compatibility of precision parts, avoiding losses caused by product functional failure.

[0021] (2) In actual operation, the structure design of the groove ring cylinder and the connected elastic cable in the size diameter adjusting part provides double protection for the movement of the adaptive slider. The groove ring cylinder provides precise guidance and limiting to ensure that the adaptive slider always slides smoothly along the radial direction, avoiding uneven runner adjustment caused by movement trajectory deviation. At the same time, the sliding connection reduces the moving resistance of the slider, ensuring the timeliness of the response. The connected elastic cable is embedded in the adaptive slider to form an integrated structure, which can provide elastic constraint when the slider expands and expands the runner to prevent excessive displacement of the slider and damage the sealing of the runner, and can assist the slider to reset accurately when it is contracted to avoid adjustment deviation caused by inertia.

[0022] (3) More importantly, the C-shaped configuration of the connecting plate and the clamping plate design not only matches the spatial layout of the assembled pipe, but also realizes efficient cooperation of multiple components, providing reliable structural support for size adjustment. The C-shaped structure can avoid the key area of the flow channel, and its upper and lower ends are fixedly connected with the matching slider, forming a rigid linkage relationship, ensuring that the power of the moving plate can be stably transmitted to the slider, enabling multiple sliders to move synchronously, avoiding adjustment deviation caused by uneven power transmission. The center clamping plate serves as a connection intermediary, strengthening the assembly stability of the connecting clamping plate and the butt joint pipe, preventing them from loosening and separating during dynamic adjustment, and cooperating with the corrugated deformation characteristics of the butt joint pipe to ensure the sealing performance of the flow channel without hindering the radial movement of the matching slider. The overall design makes power transmission more accurate and component connection more stable, further improving the controllability of size adjustment and ensuring the pressure compensation effect.

[0023] The cross-sectional area of the clamping plate is larger than that of the upper and lower ends of the connecting plate. From the perspective of connection performance, the larger cross-sectional area can significantly increase the contact area with the butt joint pipe, greatly improving the connection strength and stability of the assembly, avoiding loosening caused by vibration during long-term dynamic adjustment, and ensuring the overall structure. From the perspective of force transmission, this design can form a gentle transition in the force transmission path, effectively optimizing stress distribution, dispersing local concentrated stress to a larger area, and reducing the risk of structural failure such as cracking and deformation of the connecting plate due to stress concentration.

[0024] (4) The device drives the trigger slide rod to realize targeted suction through the linkage of the moving plate and the fixed bottom plate, and the suction force is accurately applied to the mold exhaust hole through the nozzle embedded pipe, which can quickly extract the gas filled and left in the corners of the cavity, the bottom of the deep cavity, and other closed areas, reducing the internal gas pressure of the cavity. This targeted suction can cooperate with traditional external parting exhaust grooves, and can also be designed and used independently to break through the limitations of internal parting structure on exhaust layout, avoiding air being wrapped by the melt to form bubbles and cavities. At the same time, the airflow negative pressure can also assist the flow end of the injection liquid to reduce the shrinkage defect.

[0025] Secondly, it can rely on the movement of the trigger slide rod and the cooperation of the valve group to realize targeted exhaust from below, further strengthening the gas-liquid balance of the cavity. When the moving plate moves away from each other, the fixed bottom plate pushes the trigger slide rod close to the nozzle embedded pipe, causing the internal gas pressure of the connecting curved pipe to rise, pushing the upper one-way valve of the valve group to close and the lower one-way valve to open, and the gas is directedly discharged through the lower channel. This targeted exhaust can release the internal pressure of the cavity in time, cooperate with the size compensation of the flow channel to realize two-dimensional optimization, ensure uniform filling of the injection liquid, and avoid problems such as mechanical property degradation and sealing failure caused by trapped gas, significantly improving the injection quality of the internal parting mold and the service life of the product.

[0026] (5) In actual use, the conical nesting design of the trigger slide rod and the nozzle embedded pipe is the key to ensure the precise exhaust and stable operation of the device. The outer cone and inner cone structure with the same taper allows the trigger slide rod to automatically correct the installation and movement deviation when it approaches or moves away from the nozzle embedded pipe, using the self-guiding characteristics of the tapered surface. Even if there is a small assembly error, the two can be aligned gradually through the tapered surface contact, ensuring that the two axis lines coincide, avoiding movement jamming or sealing failure caused by misalignment; the diameter of the trigger slide rod end cone is slightly larger than the diameter of the nozzle embedded pipe conical hole, forming an interference fit trend when nesting, which can achieve efficient sealing by close fitting during the jet stage, and accurately guide the airflow to the cavity exhaust hole; and can form a stable airflow channel using the gap between the tapered surfaces during the suction stage, ensuring the directional suction effect and assisting the cavity gas-liquid balance control. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a front perspective structure schematic diagram of the present application.

[0028] Figure 2 is a plane side view structure schematic diagram of the present application.

[0029] Figure 3 is a mold and dynamic double adjustment mechanism position relationship corresponding schematic diagram of the present application.

[0030] Figure 4 is a dynamic double adjustment mechanism three-dimensional structure schematic diagram of the present application.

[0031] Figure 5 is a dynamic double adjustment mechanism plane top view structure schematic diagram of the present application.

[0032] Figure 6 is a three-dimensional structure schematic diagram of the assembly pipe and the size diameter adjusting piece position relationship of the present application.

[0033] Figure 7 is an explosion schematic diagram of the size diameter adjusting piece of the present application.

[0034] Figure 8 is a three-dimensional structure schematic diagram of the size diameter adjusting piece in the contracted state of the present application.

[0035] Figure 9 is a three-dimensional structure schematic diagram of the size diameter adjusting piece in the expanded state of the present application.

[0036] Figure 10 is a three-dimensional structure schematic diagram of the internal structure of the communication curved pipe of the present application.

[0037] Figure 11 is a plane schematic diagram of the trigger slide rod and the nozzle embedded pipe position relationship of the present application.

[0038] In the figure, the reference numerals are: 1, upper mold group; 11, lower mold group; 12, injection molding pipeline.

[0039] 2, dynamic double adjustment mechanism; 21, drive cylinder; 22, linkage inclined plate; 23, adjustment plate block; 24, triggering shaft; 25, limiting sliding shaft; 26, reset spring; 27, assembly through pipe; 28, size diameter adjustment part; 281, groove ring cylinder; 282, adaptive sliding block; 283, concave ring groove; 284, connected elastic cable; 285, butt joint pipe; 286, connecting square plate; 29, fixed bottom plate; 210, triggering sliding rod; 211, communication elbow; 212, nozzle embedded pipe; 213, valve group. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0041] It should be noted that the structure and working principle of the upper die set 1, the lower die set 11, the injection molding pipe 12 and the like belong to the prior art, and will not be described here.

[0042] Embodiment 1: Please refer to Figure 1 - Figure 11 As shown in the figure, an inner parting injection mold includes an upper die set 1, a lower die set 11 assembled below the upper die set 1, an injection molding pipe 12 for conveying injection liquid arranged above the upper die set 1, and a dynamic double adjustment mechanism 2 arranged below the lower die set 11. The dynamic double adjustment mechanism 2 includes assembly through pipes 27 symmetrically distributed below the injection molding pipe 12, and each assembly through pipe 27 is internally provided with a size diameter adjustment part 28. The size diameter adjustment part 28 includes a plurality of adaptive sliding blocks 282 capable of synchronous action.

[0043] It should be noted that during the setting injection process, the size diameter adjustment part 28 can adaptively switch between two operating modes according to the actual pressure change of the injection liquid in the flow channel. When the pressure of the injection liquid suddenly rises due to abnormal flow, the plurality of adaptive sliding blocks 282 will synchronously move away from the center of the flow channel to switch to the stretched state, so that the local flow channel in the assembly through pipe 27 is temporarily stretched and expanded, thereby realizing pressure compensation, relieving the sudden pressure rise, and balancing the filling speed of the injection liquid in the flow channel. Conversely, when the pressure of the injection liquid suddenly decreases due to abnormal flow, the plurality of adaptive sliding blocks 282 will synchronously move towards the center of the flow channel to switch to the contracted state, so that the local flow channel in the assembly through pipe 27 is temporarily squeezed and reduced in size, thereby realizing pressure compensation by reducing the flow channel volume, avoiding the filling speed of the injection liquid slowing down or not being fully filled due to insufficient pressure, and further ensuring the stability of the overall injection liquid filling speed.

[0044] Please refer toFigure 1 - Figure 11 As shown, the dynamic dual-adjustment mechanism 2 also includes a drive cylinder 21. A linkage inclined plate 22 is fixedly connected to the outer wall of the output end of the drive cylinder 21. Adjustment plates 23 are symmetrically installed on both sides of the linkage inclined plate 22. The adjustment plates 23 are slidably connected to the lower module 11. A trigger shaft 24 is fixedly connected to the side of the adjustment plates 23 that is close to each other. The trigger shafts 24 are all located on the movement path of the linkage inclined plate 22. Limiting slide shafts 25 are symmetrically fixedly connected to the side of the adjustment plates 23 that is far from each other. A return spring 26 is sleeved on the outer wall of the limiting slide shaft 25. The two ends of the return spring 26 are fixedly connected to the adjustment plates 23 and the lower module 11, respectively. The assembly pipe 27 is L-shaped. The vertical part of the assembly pipe 27 is connected to the injection pipe 12. The output end of the horizontal part corresponds to the injection position of the module. The diameter adjustment component 28 is installed at the vertical part of the assembly pipe 27.

[0045] It should be noted that the diameter adjustment component 28 includes two upper and lower grooved ring cylinders 281, which provide guide and limit for the radial movement of several adapter sliders 282. The adapter sliders 282 are all slidably connected to the grooved ring cylinders 281. An integral elastic cable 284 is fixedly connected to the outside of the grooved ring cylinders 281. At the same time, the outer walls of the adapter sliders 282 are provided with concave ring grooves 283 corresponding to the positions of the integral elastic cable 284. The integral elastic cable 284 is embedded in the concave ring grooves 283, so that the adapter sliders 282 form an integrated connection structure through the integral elastic cable 284. When the injection pressure changes and drives the adapter sliders 282 to slide along the grooved ring cylinders 281, the integral elastic cable 284 can use its own elasticity to provide elastic constraint when the sliders extend to expand the flow channel, and assist the sliders to reset when they contract, ensuring that the diameter adjustment process is stable and controllable.

[0046] It should be noted that a docking pipe 285 is fixedly connected between the grooved annular cylinders 281. The docking pipe 285 is in the shape of a corrugated ring, and a connecting rectangular plate 286 is installed on the outer wall of the docking pipe 285. The connecting rectangular plate 286 is fixedly connected to the adjusting plate 23. The connecting rectangular plate 286 is in the shape of a C-shape, and its upper and lower ends correspond to and are fixedly connected to the upper and lower distributed adapter sliders 282, respectively, thus establishing a rigid linkage relationship between the adapter sliders 282 and the connecting rectangular plate 286. This ensures that the displacement movement of the adapter sliders 282 can be effectively transmitted through the connecting rectangular plate 286. A clamping plate is fixedly connected at the center of the connecting rectangular plate 286. This clamping plate serves as a key connection medium, enabling the connecting rectangular plate 286 and the docking pipe 285 to be stably assembled.

[0047] Specifically, when the injection molding fluid experiences a sudden pressure surge due to abnormal flow, the system triggers the pressure compensation mechanism of the dynamic dual-adjustment mechanism 2: such as... Figure 5As shown, the drive cylinder 21 receives the pressure signal and performs the contraction movement, synchronously driving the linkage inclined plate 22 to move linearly. Since the triggering shaft 24 is located on the movement path of the linkage inclined plate 22, when the linkage inclined plate 22 moves, the extrusion force of the linkage inclined plate 22 on the triggering shaft 24 gradually decreases, and then the symmetrically distributed linkage plate blocks 23 slide along the lower mold set 11 to the direction of approaching each other. At this time, the reset spring 26 outside the limiting sliding shaft 25 restores the stretched state and stores the elastic potential energy.

[0048] As shown, Figure 6 The movement of the linkage plate block 23 is transmitted to the adaptive sliding block 282 through the rigidly connected connecting web plate 286. The C-shaped connecting web plate 286 is fixed with the center clamping plate and the docking pipe 285, and the upper and lower ends drive the upper and lower adaptive sliding blocks 282 to synchronously slide along the guide track of the groove ring cylinder 281 to the direction away from the flow channel center of the assembly pipe 27. In this process, the connected elastic cable 284 in the groove 283 on the outer wall of the adaptive sliding block 282 is stretched, and the reverse constraint is provided by using its own elasticity to avoid excessive displacement of the sliding block. Finally, the adaptive sliding blocks 282 synchronously expand to form an extended state, temporarily expanding the local flow passage cross-sectional area of the vertical part of the assembly pipe 27, increasing the flow space of the injection liquid, effectively releasing the pressure, and restoring the filling speed to balance. At the same time, the docking pipe 285 with a corrugated annular shape deforms adaptively with the movement of the sliding block, ensuring that the flow channel sealing performance is not affected.

[0049] When the injection liquid pressure suddenly decreases due to abnormal flow, the dynamic double linkage mechanism 2 starts reverse adjustment: the drive cylinder 21 drives the linkage inclined plate 22 to output reset movement, gradually increasing the extrusion on the triggering shaft 24. At this time, the reset spring 26 that is restored to the stretched state is also synchronously extruded and compressed, driving the linkage plate block 23 to slide along the lower mold set 11 to the direction of moving away from each other, and the limiting sliding shaft 25 is synchronously reset and moved with the plate block.

[0050] The reverse movement of the linkage plate block 23 is transmitted to the adaptive sliding block 282 through the connecting web plate 286. The C-shaped connecting web plate 286 drives the upper and lower adaptive sliding blocks 282 along the guide track of the groove ring cylinder 281 to the flow channel center of the assembly pipe 27. In this process, the connected elastic cable 284 is restored from the stretched state, and the elastic auxiliary adaptive sliding block 282 is precisely reset and inwards contracted, avoiding excessive contraction caused by inertia. Finally, the adaptive sliding blocks 282 synchronously gather to form a contraction state, extruding and reducing the local flow passage cross-sectional area of the vertical part of the assembly pipe 27, and increasing the injection liquid pressure by reducing the flow space to avoid the slow filling speed or incomplete filling caused by insufficient pressure. The docking pipe 285 is synchronously reset with the sliding block contraction to maintain the stability of the flow channel structure.

[0051] During the whole dynamic adjustment process, each component is precisely coordinated through rigid connection and elastic constraint. The driving cylinder 21 serves as the power source, and its linear motion is converted into the horizontal sliding of the mobilization plate 23 through the linkage inclined plate 22. The contact between the touch shaft 24 and the inclined surface of the linkage inclined plate 22 ensures efficient conversion of force direction. The limiting sliding shaft 25 and the return spring 26 form an elastic limiting structure, which not only limits the sliding stroke of the mobilization plate 23, but also provides a return force to avoid rigid impact.

[0052] In the size adjustment member 28, the groove ring cylinder 281 provides radial guidance for the sliding block 282 to ensure stable movement trajectory. The connection of the continuous elastic cable 284 and the concave ring groove 283 forms a synchronous linkage structure for multiple sliding blocks, avoiding adjustment failure caused by single sliding block jamming. The C-shaped structure of the connecting plate 286 is rigidly connected with the butt joint pipe 285 through the center clamp, which not only adapts to the spatial layout of the assembly pipe 27, but also converts the horizontal movement of the mobilization plate 23 into the radial movement of the sliding block 282, realizing efficient force transmission.

[0053] The L-shaped structure of the assembly pipe 27 ensures that the flow channel adjustment and the injection liquid transportation do not interfere with each other: the size adjustment of the vertical part does not affect the material supply to the mold group injection position of the horizontal part, and the deformation ability of the corrugated butt joint pipe 285 further guarantees the sealing and continuity of the flow channel during the dynamic adjustment process.

[0054] Based on Embodiment 1, please refer to Figure 1 - Figure 11 As shown in FIG. 1, the mobilization plate 23 is fixedly connected with the fixed bottom plate 29 on the side away from each other, and the surface of the fixed bottom plate 29 is symmetrically installed with the trigger sliding rod 210. The outer wall of the trigger sliding rod 210 is slidingly connected with the communication elbow 211, and the end of the communication elbow 211 away from the trigger sliding rod 210 is communicated with the nozzle embedded pipe 212, and the output end of the nozzle embedded pipe 212 corresponds to the position of the exhaust hole opened between the mold groups.

[0055] It needs to be explained that the trigger slide rod 210 is fixedly connected with a ball near one end of the fixed bottom plate 29, the trigger slide rod 210 and the fixed bottom plate 29 are connected through the ball in a universal manner, one end of the trigger slide rod 210 away from the fixed bottom plate 29 is in a conical shape, and the output end of the nozzle embedded pipe 212 is also in a conical shape, both are designed with the same taper, and the diameter of the conical body at the end of the trigger slide rod 210 is slightly larger than the diameter of the conical hole at the end of the nozzle embedded pipe 212, forming a nested fit of the outer cone and the inner cone, the radius ratio of the communication elbow pipe 211 and the nozzle embedded pipe 212 is two to one, the communication elbow pipe 211 is in a T shape as a whole, and the valve group 213 is installed on the vertical part of the communication elbow pipe 211, the valve group 213 is composed of two one-way valves in an up-down manner, in the initial state, the upper one-way valve is in an open state, and the lower one-way valve is in a closed state.

[0056] Specifically, when the drive cylinder 21 drives the linkage inclined plate 22 to reset, and the plate blocks 23 move towards each other under the elastic force of the reset spring 26, the fixed bottom plate 29 translates inward synchronously with the plate blocks, and drives the trigger slide rod 210 to move away from the nozzle embedded pipe 212.

[0057] With the continuous pulling back of the trigger slide rod 210, the gas pressure in the communication elbow pipe 211 decreases, and because the lower one-way valve of the valve group 213 is closed and the upper one-way valve is opened, the suction force generated in the communication elbow pipe 211 acts through the upper channel of the communication elbow pipe 211, through the corresponding exhaust hole of the output end of the nozzle embedded pipe 212, and directional suction, this process can be targeted to quickly extract the gas remaining in the cavity after filling of the injection liquid, reduce the gas pressure in the cavity, and pre-vent gas for the next injection cycle, while using the airflow negative pressure to assist the flow of the injection liquid at the end, and reduce the shrinkage mark defect.

[0058] When the drive cylinder 21 pushes the linkage inclined plate 22 to press the trigger shaft 24, and the plate blocks 23 are driven to move away from each other, because the fixed bottom plate 29 is installed on the side of the plate blocks 23 away from each other, the fixed bottom plate 29 translates outward synchronously with the plate blocks, and then drives the trigger slide rod 210 symmetrically installed on the surface of the fixed bottom plate 29 to move towards the nozzle embedded pipe 212.

[0059] The trigger slide rod 210 and the fixed bottom plate 29 are connected through the ball in a universal manner, and the angle can be adjusted adaptively during movement to offset the installation and movement deviation, with the continuous advancement of the trigger slide rod 210, the gas pressure in the communication elbow pipe 211 increases, and in the initial state, the upper one-way valve of the valve group 213 is opened and the lower one-way valve is closed, so the airflow generated in the communication elbow pipe 211 pushes the upper one-way valve to close, and the lower one-way valve is opened due to the pressure difference, and the gas in the communication elbow pipe 211 is discharged through the lower channel.

[0060] In the above overall movement process, the universal ball joint of the trigger slide rod 210 is triggered to adjust the axis deviation of the communicating curved pipe 211 by a small angle when the fixed bottom plate 29 is translated, so as to ensure the precise cooperation between the conical end and the nozzle embedded pipe 212, avoid motion interference and sealing failure, and the T-shaped structure of the communicating curved pipe 211 can integrate the air suction and exhaust passages.

[0061] The upper and lower one-way valves of the valve group 213 automatically switch states according to the air pressure difference, and form a time sequence linkage with the movement of the trigger slide rod 210: when the slide rod is close to the nozzle (when air is sprayed), the upper valve is closed and the lower valve is opened; when the slide rod is away from the nozzle (when air is sucked), the upper valve is opened and the lower valve is closed; without additional electric control, the mechanical movement and air pressure difference are used to realize the cycle of “air spraying-exhaust air-air suction-pre-exhaust air”, so as to compensate the flow channel size and diameter and cooperate with the cavity gas-liquid balance, optimize the injection quality of the inner parting mold from the aspects of pressure control and air flow assistance, and reduce defects such as uneven filling, bubbles and shrink marks.

[0062] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An inner-dividing injection mold, comprising an upper mold set (1), a lower mold set (11) is assembled below the upper mold set (1), an injection pipe (12) for conveying injection liquid is arranged above the upper mold set (1), characterized in that: The lower mold group (11) is provided below with a dynamic double-adjusting mechanism (2), which comprises assembly through pipes (27) symmetrically distributed below the injection pipe (12), and each assembly through pipe (27) is internally provided with a size adjusting piece (28), which comprises a plurality of adaptive sliding blocks (282) capable of synchronous action. In the setting injection process, the size adjusting piece (28) can adaptively switch two operating modes according to the actual pressure change of the injection liquid in the flow channel: when the injection liquid causes the pressure to suddenly rise due to abnormal flow, a plurality of adaptive sliding blocks (282) will synchronously move away from the center of the flow channel, switch to the stretched state, and through the action, the local flow channel in the assembly through pipe (27) is stretched and temporarily expanded, so as to realize pressure compensation, relieve the sudden pressure rise and balance the filling speed of the injection liquid in the flow channel; on the contrary, when the injection liquid causes the pressure to suddenly decrease due to abnormal flow, a plurality of adaptive sliding blocks (282) will synchronously move towards the center of the flow channel, switch to the contracted state, and extrude the local flow channel in the assembly through pipe (27) to temporarily shrink, so as to realize pressure compensation by reducing the flow channel volume. The dynamic double-adjusting mechanism (2) further comprises a driving cylinder (21), the output end outer wall of the driving cylinder (21) is fixedly connected with a linkage inclined plate (22), both sides of the linkage inclined plate (22) are symmetrically provided with adjusting plate blocks (23), the adjusting plate blocks (23) are in sliding connection with the lower mold group (11), and the sides of the adjusting plate blocks (23) close to each other are fixedly connected with touch shafts (24), the touch shafts (24) are located on the movement path of the linkage inclined plate (22). The sides of the adjusting plate blocks (23) away from each other are symmetrically fixedly connected with limiting sliding shafts (25), the outer walls of the limiting sliding shafts (25) are all sleeved with return springs (26), and both ends of the return springs (26) are fixedly connected with the adjusting plate blocks (23) and the lower mold group (11) respectively.

2. An inner split injection mold as defined in claim 1, wherein: The assembly through pipe (27) is in the shape of L as a whole, the vertical part of the assembly through pipe (27) is in communication with the injection pipe (12), and the output end of the horizontal part corresponds to the injection position of the mold group, and the size adjusting piece (28) is installed at the vertical part of the assembly through pipe (27).

3. An internal parting injection mold according to claim 1, characterized in that: The size adjusting piece (28) comprises two upper and lower groove ring cylinders (281) which provide guiding and limiting for radial movement of the plurality of adaptive sliding blocks (282), and the plurality of adaptive sliding blocks (282) are in sliding connection with the groove ring cylinders (281), the groove ring cylinders (281) are fixedly connected with the connected elastic cords (284) outside, meanwhile, the outer walls of the plurality of adaptive sliding blocks (282) are provided with recessed grooves (283) corresponding to the positions of the connected elastic cords (284), the connected elastic cords (284) are embedded in the recessed grooves (283), so that the plurality of adaptive sliding blocks (282) are integrally connected through the connected elastic cords (284), when the injection pressure changes to drive the adaptive sliding blocks (282) to slide along the groove ring cylinders (281), the connected elastic cords (284) provide elastic constraint for the expansion of the flow channel by utilizing the elasticity of the connected elastic cords (284) when the sliding blocks expand, and assist the sliding blocks to reset when the sliding blocks contract.

4. An inner split injection mold as defined in claim 3, wherein: The groove ring cylinders (281) are fixedly connected with the butt joint pipes (285), the butt joint pipes (285) are in the shape of corrugated annular as a whole, and the outer walls of the butt joint pipes (285) are provided with the connecting square plates (286), and the connecting square plates (286) are in fixed connection with the adjusting plate blocks (23).

5. An inner dividing injection mold according to claim 4, characterized in that: The connecting square plates (286) are in the shape of C as a whole, and the upper and lower ends thereof are in fixed connection with the adaptive sliding blocks (282) distributed above and below correspondingly, so as to build the rigid linkage relationship between the adaptive sliding blocks (282) and the connecting square plates (286), and ensure that the displacement movement of the adaptive sliding blocks (282) can be effectively transmitted through the connecting square plates (286). The center positions of the connecting square plates (286) are fixedly connected with clamping plates, the clamping plates enable the connecting square plates (286) and the butt joint pipes (285) to be stably assembled, and the cross-sectional area of the clamping plates is greater than that of the upper and lower ends of the connecting square plates (286).

6. An inside parting injection mold according to claim 1, characterized in that: The sides away from each other of the adjusting plate blocks (23) are fixedly connected with the fixed bottom plates (29), the surfaces of the fixed bottom plates (29) are symmetrically provided with the trigger sliding rods (210), the outer walls of the trigger sliding rods (210) are slidably connected with the communicating curved pipes (211), the ends away from the trigger sliding rods (210) of the communicating curved pipes (211) are communicated with the nozzle embedded pipes (212), and the output ends of the nozzle embedded pipes (212) correspond to the positions of the exhaust holes provided between the modules.

7. An inside parting injection mold according to claim 6, characterized in that: The ends close to the fixed bottom plates (29) of the trigger sliding rods (210) are fixedly connected with the ball bodies, the trigger sliding rods (210) and the fixed bottom plates (29) are connected through the ball bodies in universal movement, the ends away from the fixed bottom plates (29) of the trigger sliding rods (210) are in the shape of cone, the output ends of the nozzle embedded pipes (212) are also in the shape of cone, both are designed in the same taper, and the diameter of the cone body at the end of the trigger sliding rod (210) is slightly greater than that of the cone hole at the end of the nozzle embedded pipe (212), so as to form the nested cooperation of the outer cone and the inner cone.

8. An inside parting injection mold according to claim 6, characterized in that: The radius ratio of the communicating curved pipe (211) and the nozzle embedded pipe (212) is two to one, the whole of the communicating curved pipe (211) is T-shaped, and the vertical part of the communicating curved pipe (211) is provided with a valve group (213), the whole of the valve group (213) is composed of two one-way valves combined, in the initial state, the upper one-way valve is in the open state, guiding the fluid to flow in the upper part, and the lower one-way valve is in the closed state, blocking the downward flow path.

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