Lossless core-pulling automobile air inlet pipe mold

Abstract

The invention relates to a lossless core-pulling automobile air inlet pipe mold, and relates to the technical field of molds, the lossless core-pulling automobile air inlet pipe mold comprises a fixed mold, a movable mold, a fixed mold core, a movable mold core, a molding cavity, a hot runner system and an ejection mechanism, the fixed mold is provided with a top core-pulling mechanism, and the movable mold is provided with a side core-pulling mechanism and a main core-pulling mechanism. The core-pulling mechanism has the following advantages and effects that the top core-pulling mechanism, the side core-pulling mechanism and the main core-pulling mechanism are arranged, and the action sequence and the space coordination relation are strictly stipulated, so that ordered core-pulling and interference-free operation of the automobile air inlet pipe with the complex structure in the demolding process are realized; and the problems of product strain, deformation or tearing caused by core pulling action conflict or insufficient space are effectively avoided, so that lossless demolding is realized, and the quality of the air inlet pipe and the operation reliability of the mold are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to a non-destructive core-pulling mold for automotive air intake pipes. Background Technology

[0002] As an important component of the engine's air intake system, the automotive air intake manifold typically has a complex structure, often featuring internal arc-shaped cavities, side holes or bosses, and detailed top features. These complex plastic parts are difficult to demold after injection molding. Improper core-pulling sequence or interference between core-pulling mechanisms can easily lead to surface scratches, localized deformation, or even structural tearing.

[0003] In existing technologies, molds for such complex air intake pipes often employ multiple independent core-pulling mechanisms. However, these mechanisms frequently lack strict control over their sequence and spatial coordination. Especially when handling core-pulling from multiple directions, such as the top and internal cavities, conflicts in the timing of actions or insufficient demolding space can easily lead to damage to the molded product during the core-pulling process. Therefore, designing a mold structure that ensures orderly core-pulling actions and non-interference in space during the demolding process of complex automotive air intake pipes, thereby achieving truly non-destructive demolding, has become a core problem urgently needing to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a non-destructive core-pulling mold for automotive air intake pipes to solve the problems mentioned in the background art.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A non-destructive core-pulling mold for automotive air intake pipes includes a fixed mold and a moving mold. The fixed mold and the moving mold have opposite end faces respectively provided with a fixed mold core and a moving mold core. After the fixed mold and the moving mold are closed, the fixed mold core and the moving mold core together form a molding cavity that matches the shape of the air intake pipe. A hot runner system is integrated within the fixed mold. One end of the hot runner system is connected to an external injection molding machine nozzle, and the other end is connected to the molding cavity to inject molten material. An ejection mechanism is provided within the moving mold. The fixed mold is equipped with a top core-pulling mechanism for forming the top structure of the air intake pipe, and the moving mold is equipped with a side core-pulling mechanism for forming the side structure of the air intake pipe and a main core-pulling mechanism for forming the internal cavity and bottom structure of the air intake pipe. During demolding, the top core-pulling mechanism will first pull the core under the drive of external power. Only after the top core-pulling mechanism completes the core pulling is the moving mold allowed to separate from the fixed mold. After the moving mold and the fixed mold separate, the side core-pulling mechanism will automatically complete the core pulling. The moving mold includes a separable moving mold base, which can separate the moving mold after the moving mold and the fixed mold are separated, so as to provide space for the core pulling of the main core pulling mechanism; The ejection mechanism can eject the molded product after the main core-pulling mechanism has completed core-pulling.

[0006] By adopting the above technical solution, and by setting up a top core-pulling mechanism, a side core-pulling mechanism, and a main core-pulling mechanism, and strictly defining their action sequence and spatial coordination relationship, orderly core-pulling and interference-free operation of complex automotive air intake pipes during the demolding process are achieved. The top core-pulling mechanism takes priority in the initial stage of demolding to ensure that the top structure detaches first. Subsequently, the side core-pulling mechanism automatically completes core-pulling during the mold separation process. Finally, the moving mold base separates to provide movement space for the main core-pulling mechanism, gradually completing the demolding of the internal and bottom structures. This staged and sequential demolding method effectively avoids product tearing, deformation, or ripping caused by conflicting core-pulling actions or insufficient space, thereby achieving non-destructive demolding and significantly improving the quality of the air intake pipe and the reliability of mold operation.

[0007] A further configuration is that the top core-pulling mechanism includes a double-ended locking component and two core-pulling inserts. The two core-pulling inserts are respectively connected and controlled by an independent first driving cylinder, enabling them to move synchronously in a set direction to jointly insert into or withdraw from the molding cavity. The double-ended locking component is driven by an independent second driving cylinder and includes two locking rods. The two core-pulling inserts are respectively fixedly mounted on two core-pulling sliders. When both core-pulling inserts move to the working position of being fully inserted into the molding cavity, the second driving cylinder can simultaneously drive the two locking rods to extend, so that they form an abutment fit with the sides or ends of the two core-pulling sliders, thereby preventing the two core-pulling inserts from retracting under the action of melt pressure.

[0008] By adopting the above technical solutions, the top structure can be stably formed during the injection molding process, preventing the core-pulling insert from retracting due to high melt pressure. After the core-pulling insert is in place, the double-end locking component forms a mechanical lock through the abutment of the locking rod and the core-pulling slider, which enhances the structural rigidity. At the same time, the two core-pulling inserts are driven synchronously, with high consistency of movement, which further improves the symmetry and stability of the top structure forming.

[0009] A further configuration includes a locking slider, which is driven by the second driving cylinder. Two core-pulling sliders are symmetrically arranged on opposite sides of the locking slider. The top of the locking slider has two recessed and obliquely arranged guide channels. The inner sides of the two locking rods are each fixedly provided with guide protrusions that respectively engage with the corresponding guide channels. Both locking rods are covered with cover blocks that restrict their movement to only linear motion. The inner sides of the two core-pulling sliders are each provided with locking side grooves that match the locking rods. When the second drive cylinder pushes the locking slider to move linearly, the linear motion of the locking slider is synchronously converted into the opposite or opposite linear motion of the two locking rods through the oblique cooperation of the guide channel and the guide protrusion. This allows the outer ends of the two locking rods to be simultaneously inserted into or withdrawn from the two locking side slots, thereby achieving simultaneous locking or unlocking of the two core-pulling sliders.

[0010] By adopting the above technical solution and designing a locking slider structure with inclined guide channels and guide protrusions, the linear motion of the locking slider is converted into the synchronous opposite or opposite motion of the two locking rods, realizing the simultaneous locking or releasing of the two core-pulling sliders. The mechanism is compact and the action is coordinated. The inclined cooperation of the guide channel and the protrusion provides a smooth power conversion. The locking rods can only move linearly under the constraint of the cover block, which enhances the locking accuracy and reliability. The above settings not only simplify the drive layout, but also improve the locking response speed and synchronization, effectively ensuring the stability and safety of the top core-pulling mechanism during injection molding and demolding.

[0011] A further configuration is that the two core-pulling inserts are respectively disposed at the bottom of the two core-pulling sliders, and the bottom of the two core-pulling sliders is provided with an obliquely arranged T-shaped guide groove. The top of the two core-pulling inserts is fixedly provided with T-shaped guide blocks that are respectively embedded and slidably constrained in the corresponding T-shaped guide grooves. When the two first driving cylinders push the core-pulling sliders to move linearly, the oblique cooperation between the T-shaped guide grooves and the T-shaped guide blocks allows the two core-pulling inserts to exit from the molding cavity in an oblique upward direction.

[0012] By adopting the above technical solution, the oblique cooperation design of the T-shaped guide groove and the T-shaped guide block allows the core-pulling insert to move obliquely upwards during the core-pulling process, thereby detaching from the molded product at an inclined angle, reducing core-pulling resistance and friction on the surface of the molded product. This oblique core-pulling method is particularly suitable for top structures with undercut or complex curved surface features, effectively avoiding product tearing or deformation caused by straight core-pulling. At the same time, the cooperation between the T-shaped guide groove and the T-shaped guide block provides good guidance and load-bearing capacity, ensuring a smooth and stable core-pulling process, further improving demolding quality and mold life.

[0013] A further feature is that a positioning main rod extends from both the locking slider and the two core-pulling sliders. A bent positioning secondary rod is formed on the outer side of the positioning main rod. Two position detection sensors are provided on the travel path of the positioning secondary rod to detect the two extreme positions of the positioning secondary rod.

[0014] By adopting the above technical solution, and by setting a positioning main rod with a positioning sub-rod on each slider, combined with a position detection sensor, real-time and accurate monitoring of the position of the locking slider and the core-pulling slider is achieved. The sensor can detect whether the positioning sub-rod has reached the limit position of full insertion or full withdrawal, and then feed back to the control terminal to realize electrical interlocking and safety control of the action sequence. This detection mechanism can effectively prevent malfunctions, improve the automation level and operational safety of mold operation, and ensure that the demolding process is reliably executed in strict accordance with the preset sequence.

[0015] A further provision is that the side core-pulling mechanism includes a core-pulling seat slidably mounted within the moving mold. The core-pulling seat is capable of moving in a predetermined direction to insert into or withdraw from the molding cavity. The core-pulling seat has one or more inclined guide holes with predetermined inclination angles. An additional number of inclined guide pillars matching the number of inclined guide holes are fixedly mounted on the fixed mold. After the moving mold and the fixed mold are closed, the ends of each inclined guide pillar are inserted into the corresponding inclined guide hole, forcing the core-pulling seat forward and stabilizing it in a working position where it is fully inserted into the molding cavity. After the moving mold and the fixed mold are separated, the inclined guide pillars and the inclined guide holes allow the core-pulling seat to retract, thereby completing the core-pulling process during the mold-separation stroke.

[0016] By adopting the above technical solution, the side core-pulling mechanism can automatically complete the core-pulling process during the separation of the moving and fixed molds through the cooperation of the inclined guide post and the inclined guide hole, without the need for additional power drive, which simplifies the mold structure and reduces the manufacturing cost; when the mold is closed, the inclined guide post is inserted into the inclined guide hole and pushes the core-pulling seat forward to ensure accurate positioning of the side core.

[0017] A further provision is that the main core-pulling mechanism includes a rotatable main core-pulling block, which can be rotated to a working position where it is fully inserted into the molding cavity, in order to form an arc-shaped cavity inside the air intake pipe.

[0018] By adopting the above technical solution, a rotatable main core-pulling block is used to form the arc-shaped cavity inside the air inlet pipe. The core-pulling is performed by rotation, which avoids the damage that traditional straight-line core-pulling may cause to complex curved surface products. When the mold is closed, the main core-pulling block rotates and inserts into the forming cavity to form a precise internal contour. When demolding, it rotates in the opposite direction and exits. The action path adapts to the geometric characteristics of the arc-shaped cavity, which significantly reduces demolding resistance and product stress, and achieves efficient and non-destructive internal demolding.

[0019] A further provision is that the moving mold base includes a retaining block, which can abut against the main core-pulling block in its working position when fully inserted into the molding cavity to lock its position.

[0020] By adopting the above technical solution, by setting a retaining block on the moving mold base, which abuts against the main core-pulling block in the working position to form a mechanical lock, the main core-pulling block is effectively prevented from rotating or retracting due to melt pressure during injection molding, thus ensuring the stability and consistency of the internal molding dimensions.

[0021] A further feature is that the main core-pulling mechanism includes two rack seats slidably disposed within the moving mold. The two rack seats are simultaneously controlled by an independent third drive cylinder and can slide along a set direction. Arc-shaped drive blocks are respectively disposed on the two rack seats and mesh with them. The main core-pulling block is fixed between the two arc-shaped drive blocks. The two arc-shaped drive blocks can rotate under the drive of the two rack seats to drive the main core-pulling block to insert into or exit the molding cavity. The moving mold has two guide seats fixedly installed at positions corresponding to the arc-shaped drive blocks. Arc-shaped guide grooves are opened on the inner side of the two guide seats. Arc-shaped guide strips are fixedly installed on the outer side of the two arc-shaped drive blocks. The two arc-shaped guide strips are respectively embedded in and rotatably constrained by the corresponding arc-shaped guide grooves.

[0022] By adopting the above technical solution, the linear motion of the third drive cylinder is converted into the rotational motion of the drive block through the meshing transmission between the rack seat and the arc-shaped drive block, thereby driving the main core-pulling block to rotate precisely. At the same time, the arc-shaped guide groove and arc-shaped guide bar in the guide seat further constrain and guide the rotation trajectory of the drive block, ensuring that the rotation process of the main core-pulling block is smooth and without shaking, and improving the core-pulling accuracy and repeatability consistency.

[0023] A further feature is that each of the two arc-shaped drive blocks has a limiting rod extending from it, and the moving mold has movable openings for the two limiting rods to pass through and move. The two limiting rods can contact the corresponding movable opening wall to achieve the limiting purpose.

[0024] By adopting the above technical solution, a limiting rod is set on the rack seat and moves in the movable opening in the moving mold. When the rack seat reaches the end of its stroke, the limiting rod contacts the hole wall to achieve mechanical hard limiting, preventing the mechanism from overshooting or exceeding the predetermined position. This limiting method has a simple and reliable structure, provides the final position guarantee for the rotary core pulling action, and enhances the safety and stability of the mold operation.

[0025] In summary, the present invention has the following beneficial effects: by setting up a top core-pulling mechanism, a side core-pulling mechanism, and a main core-pulling mechanism, and strictly defining their action sequence and spatial coordination relationship, the orderly core-pulling and interference-free operation of complex automotive air intake pipes during the demolding process is realized. This effectively avoids product tearing, deformation, or tearing caused by core-pulling action conflicts or insufficient space, thereby achieving non-destructive demolding and significantly improving the quality of the air intake pipe and the reliability of mold operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the embodiment; Figure 2 This is a schematic diagram of the fixed mold structure in the embodiment; Figure 3 This is a schematic diagram of the moving mold in the embodiment; Figure 4 This is a schematic diagram of the cooperative structure of the top core-pulling mechanism, the side core-pulling mechanism and the main core-pulling mechanism inside the embodiment; Figure 5 for Figure 4 Enlarged view of section A; Figure 6 This is a schematic diagram illustrating the cooperation between the core-pulling insert and the core-pulling slider in the embodiment; Figure 7 This is a schematic diagram of the internal structure of the moving mold in the embodiment; Figure 8 This is a schematic diagram of the cooperation structure between the side core-pulling mechanism and the main core-pulling mechanism in the embodiment; Figure 9 This is a schematic diagram of the mating structure between the rack seat and the guide seat in the embodiment.

[0027] In the diagram: 11. Fixed mold; 111. Fixed mold core; 12. Moving mold; 120. Moving mold base; 1201. Removing block; 121. Moving mold core; 21. Hot melt tube; 31. Core-pulling insert; 32. First drive cylinder; 33. Core-pulling slider; 331. Locking side groove; 41. Locking slider; 411. Guide channel; 42. Second drive cylinder; 43. Locking rod; 431. Guide protrusion; 44. Cover block; 5 1. T-shaped guide groove; 52. T-shaped guide block; 61. Positioning main rod; 62. Positioning secondary rod; 63. Position detection sensor; 71. Core pulling seat; 711. Angled guide hole; 72. Angled guide post; 81. Main core pulling block; 82. Rack seat; 83. Third drive cylinder; 84. Arc-shaped drive block; 841. Arc-shaped guide bar; 85. Guide seat; 851. Arc-shaped guide groove; 91. Limiting rod; 92. Movable opening. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] like Figures 1-9 As shown, this embodiment discloses a non-destructive core-pulling mold for automobile intake pipes, which has the advantage of ingenious design. Through the linkage of the top core-pulling mechanism, the side core-pulling mechanism and the main core-pulling mechanism, it is ensured that the complex automobile intake pipe products can be smoothly and without damage removed from the mold.

[0030] This embodiment consists of two main parts: a fixed mold 11 and a moving mold 12. Fixed mold cores 111 and 121 are respectively installed on the opposite end faces of the fixed mold 11 and the moving mold 12. When the fixed mold 11 and the moving mold 12 are in the closed state, the fixed mold cores 111 and 121 fit tightly together to form a molding cavity that perfectly matches the shape of the target automotive air intake pipe. Inside the fixed mold 11, a hot runner system is integrated. One end of the hot runner system is connected to the nozzle of an external injection molding machine via a hot melt pipe 21 to receive molten plastic, while the other end is directly connected to the molding cavity, thereby injecting the melt into the cavity for filling and molding. Inside the moving mold 12, an ejection mechanism is provided for the final ejection of the product. The ejection mechanism is a conventional structure in the mold industry and is existing technology.

[0031] This embodiment designs three sets of core-pulling mechanisms for different parts of the intake pipe, and they operate in a strict sequence. Specifically, a top core-pulling mechanism is provided on the fixed mold 11, which is specifically used to form holes, bosses, or complex curved surface structures that may exist at the top of the intake pipe. A side core-pulling mechanism and a main core-pulling mechanism are provided on the moving mold 12, which are used to form the side structures of the intake pipe (such as side holes or side recesses) and the structures that constitute the main cavities and bottom contours inside the intake pipe, respectively.

[0032] The entire demolding process follows strict sequential control to ensure that the molded product is not damaged. First, driven by external power, the top core-pulling mechanism must complete its core-pulling action first. Only after the top core-pulling mechanism confirms complete removal can the moving mold 12 begin to separate from the fixed mold 11. During the separation process between the moving mold 12 and the fixed mold 11, the side core-pulling mechanism automatically completes its core-pulling action with the power provided by the separation action itself. After the moving mold 12 and the fixed mold 11 are separated, the moving mold 12 itself will be further separated. Specifically, the moving mold 12 includes a separable moving mold base 120, which can be moved or opened after separation, thereby making necessary space for the movement of the main core-pulling mechanism. It should be noted that the separation structure between the moving mold base 120 and the moving mold 12 adopts a separable design commonly used in mold technology (e.g., separation and resetting are achieved by driving with a hydraulic cylinder or pneumatic cylinder), which is existing technology. Its specific structure and working principle will not be described in detail here. Driven by an external power source (such as a hydraulic cylinder), the moving mold base 120 separates from the moving mold 12 and moves a certain distance away, thus providing the necessary space for the main core-pulling block 81 to rotate and exit. Next, the main core-pulling mechanism begins to operate, completing the core-pulling of the internal and bottom structures of the molded product. Finally, after all core-pulling actions are completed, the ejection mechanism inside the moving mold 12 is activated, smoothly ejecting the completely demolded air inlet pipe product.

[0033] The top core-pulling mechanism includes two core-pulling inserts 31 and a double-ended locking component. The two core-pulling inserts 31 are used for localized features on the top of the molded product. They are connected and controlled by independent first drive cylinders 32, enabling them to move synchronously in a set direction, thus inserting into or withdrawing from the molding cavity together. To prevent the two core-pulling inserts 31 from retracting due to pressure during high-pressure melt injection, a double-ended locking component is provided. This component is driven by an independent second drive cylinder 42 and includes two locking rods 43. The two core-pulling inserts 31 are respectively fixedly mounted on two core-pulling sliders 33. When the first drive cylinder 32 pushes the two core-pulling sliders 33, moving the core-pulling inserts 31 to the working position where they are fully inserted into the molding cavity, the second drive cylinder 42 immediately actuates, driving the two locking rods 43 to extend simultaneously, so that their ends form a firm abutment with the sides or ends of the two core-pulling sliders 33, thereby locking them and effectively resisting melt pressure.

[0034] Furthermore, the double-ended locking component specifically includes a locking slider 41 directly driven by a second drive cylinder 42, and two core-pulling sliders 33 symmetrically arranged on opposite sides of the locking slider 41. Two recessed, obliquely oriented guide channels 411 are formed at the top of the locking slider 41. Guide protrusions 431 are fixedly provided on the inner sides of both locking rods 43, and these two guide protrusions 431 respectively engage with the corresponding guide channels 411. Simultaneously, cover blocks 44 are provided above both locking rods 43, constraining the locking rods 43 so that they can only move linearly and cannot rotate or deviate. Locking side grooves 331 matching the shape of the outer ends of the locking rods 43 are machined on the inner sides of both core-pulling sliders 33. When the second drive cylinder 42 pushes the locking slider 41 to move linearly, the oblique cooperation between the guide channel 411 and the guide protrusion 431 cleverly converts the horizontal linear motion of the locking slider 41 into the opposite (when locked) or opposite (when unlocked) linear motion of the two locking rods 43. This allows the outer ends of the two locking rods 43 to be simultaneously inserted into or withdrawn from the locking side grooves 331 of the two core-pulling sliders 33, thereby achieving simultaneous mechanical locking or unlocking of the two core-pulling sliders 33.

[0035] Furthermore, two core-pulling inserts 31 are respectively disposed at the bottom of the two core-pulling sliders 33. An oblique T-shaped guide groove 51 is formed at the bottom of each of the two core-pulling sliders 33, while a T-shaped guide block 52 is fixedly disposed at the top of each core-pulling insert 31. The two T-shaped guide blocks 52 are embedded in the corresponding T-shaped guide grooves 51 and are constrained to slide only along the grooves. Therefore, when the first drive cylinder 32 pushes the core-pulling slider 33 to move horizontally in a straight line, the oblique engagement between the T-shaped guide grooves 51 and the T-shaped guide blocks 52 drives the two core-pulling inserts 31 to smoothly exit from the molding cavity in an upward oblique direction, completing the core-pulling process.

[0036] To ensure proper operation, a positioning master rod 61 extends from both the locking slider 41 and the two core-pulling sliders 33. A bent positioning sub-rod 62 is formed on the outer side of each positioning master rod 61. Two position detection sensors 63 (such as proximity switches) are installed along the expected travel path of each positioning sub-rod 62. By detecting whether the positioning sub-rod 62 has reached the two preset limit positions (i.e., fully inserted and fully withdrawn positions), the control terminal can accurately determine the state of each slider, thereby achieving sequential interlocking and safety control of the actions.

[0037] The side core-pulling mechanism includes a core-pulling seat 71 slidably mounted within the moving mold 12. The core-pulling seat 71 can move linearly in a set direction to achieve the insertion or withdrawal of the core into the molding cavity. One or more inclined guide holes 711 with predetermined inclination angles are provided on the core-pulling seat 71; in this embodiment, two are preferred. Correspondingly, a number of inclined guide pillars 72 matching the number of inclined guide holes 711 are fixedly mounted on the fixed mold 11. During mold closing, as the fixed mold 11 and the moving mold 12 close, the ends of each inclined guide pillar 72 are precisely inserted into the corresponding inclined guide hole 711, forcing the core-pulling seat 71 forward until it stabilizes at the working position where the core is fully inserted into the molding cavity. During mold opening, as the fixed mold 11 and the moving mold 12 separate, the inclined guide pillars 72 are pulled out from the inclined guide holes 711. Through the oblique engagement between the two, the core-pulling seat 71 is naturally driven to retract linearly in a set direction, thereby automatically and reliably completing the side core-pulling during the mold parting stroke.

[0038] The main core-pulling mechanism is used to shape the main arc-shaped cavity and bottom shape inside the air inlet pipe, specifically including a rotatable main core-pulling block 81. In the mold-closed state, the main core-pulling block 81 rotates to the mold-closed position and is fully inserted into the molding cavity; its surface shape directly constitutes the complex curved surface inside the molded product. During demolding, within the space provided by the removable moving mold base 120, the main core-pulling block 81 can rotate in the opposite direction by a large angle, thereby unscrewing from the internal cavity of the molded product, completing the core-pulling process. To lock the main core-pulling block 81 during injection molding, the moving mold base 120 includes a retaining block 1201. When the main core-pulling block 81 rotates to the working position, the retaining block 1201 abuts against a specific part of the main core-pulling block 81, preventing it from rotating or retracting under melt pressure.

[0039] The main core-pulling mechanism also includes two rack seats 82 slidably disposed within the moving mold 12. These two rack seats 82 are simultaneously controlled by an independent third drive cylinder 83, enabling them to slide synchronously in a set direction. Each of the two rack seats 82 is provided with an arc-shaped drive block 84 (the meshing portion of which can be considered as a segment of an arc-shaped rack), and the main core-pulling block 81 is fixedly installed between these two arc-shaped drive blocks 84. Therefore, when the third drive cylinder 83 drives the two rack seats 82 to perform linear motion, the engagement with the arc-shaped drive blocks 84 converts this motion into synchronous rotation of the two arc-shaped drive blocks 84, thereby driving the fixed main core-pulling block 81 to rotate as a whole, achieving the action of inserting or withdrawing from the molding cavity. To ensure rotational accuracy, two guide seats 85 are also fixedly disposed within the moving mold 12, each with an arc-shaped guide groove 851 on its inner side. Arc-shaped guide bars 841 are fixedly installed on the outer side of the two arc-shaped drive blocks 84. The two arc-shaped guide bars 841 are precisely embedded in the corresponding arc-shaped guide grooves 851, thereby accurately guiding and constraining the rotation trajectory of the arc-shaped drive blocks 84.

[0040] Finally, a limiting rod 91 extends from each of the two arc-shaped drive blocks 84, and movable openings 92 are provided in the moving mold 12 for the two limiting rods 91 to pass through and move. When the rack seat 82 moves to the end of its stroke, the limiting rod 91 will contact the wall of the movable opening 92, thereby playing a mechanical limiting role and preventing the rack seat 82 and the main core-pulling block 81 from overshooting.

[0041] The specific workflow of this embodiment is as follows: The two core-pulling inserts 31 of the top core-pulling mechanism are inserted into the molding cavity and locked by the double-end locking components; the core-pulling seat 71 of the side core-pulling mechanism moves forward into place under the drive of the inclined guide post 72; the main core-pulling block 81 of the main core-pulling mechanism rotates to the mold closing position, and then the melt is injected into the cavity through the hot runner system and cooled and solidified.

[0042] The demolding process begins.

[0043] First, the second drive cylinder 42 of the top core-pulling mechanism reverses its action, pulling the locking slider 41 backward in the horizontal direction. This causes the two locking rods 43 to move towards each other, disengaging from the locking side groove 331 of the core-pulling slider 33 and releasing the locking of the two core-pulling sliders 33. Next, the two first drive cylinders 32 move synchronously, pulling the two core-pulling sliders 33 backward in the horizontal direction. The T-shaped guide groove 51 at the bottom of the slider forces the T-shaped guide block 52 of the core-pulling insert 31 to move obliquely upward, thereby smoothly pulling the two core-pulling inserts 31 out obliquely from the top structure of the product. When the positioning auxiliary rod 62 of the core-pulling slider 33 triggers the "core-pulling complete" signal via the position detection sensor 63, the control terminal confirms that the top core-pulling mechanism has completely retracted.

[0044] Subsequently, the moving mold 12 is permitted to begin separating from the fixed mold 11. Under the pulling force of the injection molding machine, the fixed mold 11 and the moving mold 12 open along the main parting surface. During the mold parting process, the inclined guide post 72 fixed to the fixed mold 11 and the inclined guide hole 711 on the core-pulling seat 71 of the side core-pulling mechanism generate relative movement, forcing the core-pulling seat 71 to retract linearly in a set direction, thereby driving the side core to be smoothly pulled out from the side structure of the product, realizing automatic core pulling. At the end of the mold parting stroke, the moving mold 12 and the fixed mold 11 are completely separated, and the molded product remains on one side of the moving mold 12, wrapped around the moving mold core 121 and the main core-pulling block 81.

[0045] Subsequently, the moving mold 12 further performs internal actions. Driven by an additional power device (such as a hydraulic cylinder), the separable moving mold base 120 separates from the main body of the moving mold 12 and moves a distance away, thus providing the necessary space for the rotation and withdrawal of the main core-pulling block 81. Next, the third drive cylinder 83 of the main core-pulling mechanism is activated, driving the two rack seats 82 to move synchronously in a linear motion, meshing and driving the two arc-shaped drive blocks 84 and the main core-pulling block 81 fixed therebetween to rotate around the axis at a large angle. During this process, the arc-shaped guide strip 841 on the arc-shaped drive block 84 slides along the arc-shaped guide groove 851 of the guide seat 85, ensuring smooth and precise rotation. The main core-pulling block 81 thus rotates out from the complex cavity inside the molded product, completing the core core pulling. The limiting rod 91 of the rack seat 82 finally contacts the wall of the movable opening 92, achieving mechanical limiting.

[0046] Finally, the ejection mechanism (such as ejector plate and ejector rod) in the moving mold 12 moves forward under the drive of the ejection cylinder, smoothly ejecting the car intake pipe product, which has been completely separated from all the cores, from the moving mold core 121, completing the entire demolding process.

[0047] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A non-destructive core-pulling mold for an automotive air intake pipe, comprising a fixed mold (11) and a moving mold (12), wherein the fixed mold (11) and the moving mold (12) are respectively provided with a fixed mold core (111) and a moving mold core (121) on their opposite end faces; after the fixed mold (11) and the moving mold (12) are closed, the fixed mold core (111) and the moving mold core (121) together enclose a molding cavity that matches the shape of the air intake pipe; a hot runner system is integrated in the fixed mold (11), one end of which is used to connect to an external injection molding machine nozzle, and the other end is connected to the molding cavity to inject molten material; an ejection mechanism is provided in the moving mold (12); characterized in that: The fixed mold (11) is provided with a top core-pulling mechanism for forming the top structure of the air intake pipe, and the moving mold (12) is provided with a side core-pulling mechanism for forming the side structure of the air intake pipe and a main core-pulling mechanism for forming the internal cavity and bottom structure of the air intake pipe. When demolding, the top core-pulling mechanism will first pull the core under the drive of external power. After the top core-pulling mechanism completes the core pulling, the moving mold (12) is allowed to separate from the fixed mold (11). After the moving mold (12) separates from the fixed mold (11), the side core-pulling mechanism will automatically complete the core pulling. The moving mold (12) includes a separable moving mold base (120), which can separate the moving mold (12) from the fixed mold (11) after the moving mold (12) is separated, so as to provide space for the core pulling of the main core pulling mechanism; The ejection mechanism can eject the molded product after the main core-pulling mechanism has completed core-pulling.

2. The non-destructive core-pulling mold for automotive air intake pipes according to claim 1, characterized in that: The top core-pulling mechanism includes a double-ended locking component and two core-pulling inserts (31). The two core-pulling inserts (31) are connected and controlled by independent first drive cylinders (32), and can move synchronously in a set direction to jointly insert into or withdraw from the molding cavity. The double-ended locking component is driven by an independent second drive cylinder (42) and includes two locking rods (43). The two core-pulling inserts (31) are fixedly mounted on two core-pulling sliders (33). When both core-pulling inserts (31) move to the working position of being fully inserted into the molding cavity, the second drive cylinder (42) can simultaneously drive the two locking rods (43) to extend, so that they form an abutment fit with the sides or ends of the two core-pulling sliders (33), thereby preventing the two core-pulling inserts (31) from retracting under the action of melt pressure.

3. The non-destructive core-pulling mold for automotive air intake pipes according to claim 2, characterized in that: The double-ended locking component includes a locking slider (41), which is driven by the second driving cylinder (42). Two core-pulling sliders (33) are symmetrically arranged on opposite sides of the locking slider (41). The top of the locking slider (41) has two recessed and obliquely arranged guide channels (411). The inner sides of the two locking rods (43) are fixedly provided with guide protrusions (431) that are respectively inserted into the corresponding guide channels (411). The two locking rods (43) are covered with cover blocks (44) that restrict them to only linear movement. The inner sides of the two core-pulling sliders (33) are provided with locking side grooves (331) that match the locking rods (43). When the second drive cylinder (42) pushes the locking slider (41) to move linearly, the linear motion of the locking slider (41) is synchronously converted into the opposite or opposite linear motion of the two locking rods (43) through the oblique cooperation of the guide channel (411) and the guide protrusion (431), so that the outer ends of the two locking rods (43) can be inserted into or withdrawn from the two locking side grooves (331) at the same time, thereby realizing the simultaneous locking or unlocking of the two core-pulling sliders (33).

4. The non-destructive core-pulling mold for automotive air intake pipes according to claim 2, characterized in that: Two core-pulling inserts (31) are respectively disposed at the bottom of two core-pulling sliders (33). The bottom of each of the two core-pulling sliders (33) is provided with an obliquely arranged T-shaped guide groove (51). The top of each of the two core-pulling inserts (31) is fixedly provided with a T-shaped guide block (52) that is respectively embedded and slidably constrained in the corresponding T-shaped guide groove (51). When the two first driving cylinders (32) push the core-pulling sliders (33) to move linearly, the oblique cooperation between the T-shaped guide groove (51) and the T-shaped guide block (52) allows the two core-pulling inserts (31) to exit from the molding cavity in an oblique upward direction.

5. A non-destructive core-pulling mold for automotive air intake pipes according to claim 3, characterized in that: A positioning main rod (61) extends from both the locking slider (41) and the two core-pulling sliders (33). A bent positioning secondary rod (62) is formed on the outer side of the positioning main rod (61). Two position detection sensors (63) are provided on the travel path of the positioning secondary rod (62) to detect the two extreme positions of the positioning secondary rod (62).

6. The non-destructive core-pulling mold for automotive air intake pipes according to claim 1, characterized in that: The side core-pulling mechanism includes a core-pulling seat (71) slidably installed in the moving mold (12). The core-pulling seat (71) can move in a set direction to insert into or withdraw from the molding cavity. The core-pulling seat (71) is provided with one or more inclined guide holes (711) with a predetermined inclination angle. The fixed mold (11) is fixedly provided with a number of inclined guide pillars (72) matching the number of inclined guide holes (711). After the moving mold (12) and the fixed mold (11) are closed, the ends of each of the inclined guide pillars (72) are inserted into the corresponding inclined guide holes (711), forcing the core-pulling seat (71) to move forward and stabilize in the working position of being fully inserted into the molding cavity. After the moving mold (12) and the fixed mold (11) are separated, the inclined guide pillars (72) and the inclined guide holes (711) are inclined to make the core-pulling seat (71) retract, thereby completing the core-pulling during the mold-separation stroke.

7. The non-destructive core-pulling mold for automotive air intake pipes according to claim 1, characterized in that: The main core-pulling mechanism includes a rotatable main core-pulling block (81), which can be rotated to a working position where it is fully inserted into the molding cavity to form an arc-shaped cavity inside the air intake pipe.

8. A non-destructive core-pulling mold for automotive air intake pipes according to claim 7, characterized in that: The moving mold base (120) includes a retaining block (1201) that can abut against the main core pull block (81) which is fully inserted into the working position of the molding cavity to lock its position.

9. A non-destructive core-pulling mold for automotive air intake pipes according to claim 7, characterized in that: The main core-pulling mechanism also includes two rack seats (82) slidably disposed in the moving mold (12). The two rack seats (82) are simultaneously controlled by an independent third drive cylinder (83) and can slide in a set direction. Arc-shaped drive blocks (84) are respectively provided on the two rack seats (82) and mesh with them. The main core-pulling block (81) is fixed between the two arc-shaped drive blocks (84). The two arc-shaped drive blocks (84) can rotate under the drive of the two rack seats (82) to drive the main core-pulling block (81) to insert or withdraw from the molding cavity. The moving mold (12) is fixedly provided with two guide seats (85) whose positions are respectively corresponding to the arc-shaped drive block (84). Arc-shaped guide grooves (851) are opened on the inner side of the two guide seats (85). Arc-shaped guide strips (841) are fixedly provided on the outer side of the two arc-shaped drive blocks (84). The two arc-shaped guide strips (841) are respectively embedded and rotated and constrained by the corresponding arc-shaped guide grooves (851).

10. A non-destructive core-pulling mold for automotive air intake pipes according to claim 9, characterized in that: Each of the two arc-shaped drive blocks (84) is provided with a limiting rod (91). The moving mold (12) is provided with movable openings (92) for the two limiting rods (91) to pass through and move. The two limiting rods (91) can contact the corresponding movable opening (92) wall to achieve the limiting purpose.

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