A dual-tube single-head demolding mold structure

Abstract

A double-tube single-head demolding mold structure includes a fixed mold core, a template, a slider, gears, arc-shaped core pullers, a middle core puller, and inclined guide pillars. The slider slides parallel to the parting surface on the fixed mold core, which has a first inclined guide pillar hole and two racks fixed thereon. Two gears are rotatably mounted on the fixed mold core and mesh with corresponding racks. Two arc-shaped core pullers are rotatably mounted on the fixed mold core, each having an arc-shaped tooth segment that meshes with a corresponding gear. The middle core puller slides on the slider and is located between the two arc-shaped core pullers, with a second inclined guide pillar hole that partially overlaps with the first inclined guide pillar hole. The inclined guide pillars are mounted on the template and pass through the two inclined guide pillar holes. The template drives the inclined guide pillars to first push the middle core puller outwards independently, then drives the slider to move outwards synchronously with the middle core puller. The slider drives the gears to rotate via the racks, causing the arc-shaped core pullers to unscrew. No additional power source is required, simplifying the structure, reducing costs and maintenance, preventing interference from the double arc-shaped core pullers, adapting to double-reverse arc-shaped groove molding, and improving product accuracy and efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of molds, specifically to a double-tube single-head demolding mold structure. Background Technology

[0002] In injection molding production of products with double-tube single-head arc grooves, arc core pulling is the core step in achieving the molding and demolding of complex arc structures. Early core-pulling molds for this type of structure often used a "slanted guide post step-by-step drive + connecting rod transmission" scheme: during mold opening, the slanted guide post first moves the middle core outward to leave a gap, then drives the slider to move, and the slider drives the arc core to rotate and demold via the connecting rod. However, this scheme has significant drawbacks: the connecting rod and component fit are prone to loosening due to wear, resulting in poor transmission synchronization and a high product scrap rate; furthermore, the arc section of the connecting rod is prone to stress concentration, and long-term use can easily lead to deformation and breakage, severely affecting production efficiency.

[0003] To address the shortcomings of linkage transmission, the industry has developed a rack and pinion transmission technology for arc-shaped core pulling. Taking the "Straight Rack Bending Die" (application number 202222743852.2, authorization announcement number CN218700927U) as an example, this die utilizes a transmission path of "cylinder → straight rack → gear → gear seat → slider seat → bending core," converting linear power into arc-shaped core pulling motion through rack and pinion meshing. This solves the problem of excessively large volume in traditional arc-shaped inner hole core pulling dies and has certain applicability in the molding of single arc-shaped inner hole products. However, this technology still has significant technical shortcomings when applied to products with double-tube single-head arc grooves, as follows:

[0004] Firstly, it relies on an additional power source, resulting in a complex structure and high cost. This structure uses a hydraulic cylinder as an independent power source to drive the spur rack, requiring additional design of the hydraulic cylinder mounting bracket, oil circuit control system, and sealing structure. This not only increases the overall size and manufacturing cost of the mold but also increases the difficulty of later maintenance. Long-term use of the hydraulic cylinder is prone to problems such as aging and oil leakage of the seals and oil pressure fluctuations, leading to sluggish core pulling action or insufficient power, which directly affects the forming efficiency and accuracy of the arc groove of the product.

[0005] Secondly, its adaptability is insufficient and it cannot meet the requirements of double-reverse arc grooves. This patent only addresses the design of a single arc-shaped inner hole, and its transmission logic and structural layout can only meet the motion control of a single arc-shaped core pulling. It does not consider the synchronous motion requirements of the double arc-shaped core pulling required for two reverse-branching arc grooves in a double-tube single-head product. At the same time, its structure does not include an anti-interference mechanism. If it is forcibly applied to a double arc-shaped core pulling scenario, the two cores are prone to collision due to poor synchronization and insufficient gap in the initial contact state, which may lead to mold jamming or product damage.

[0006] Therefore, how to provide a method that does not require an additional power source, but directly drives the slider through the inclined guide post during the mold opening and closing process, thereby driving the gear rack to achieve synchronous and precise movement of double reverse arc core pulling, while avoiding demolding interference, in order to solve the problems of existing straight rack bending molds that rely on hydraulic cylinders and have poor adaptability, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a dual-tube single-head demolding mold structure that can achieve simultaneous demolding and anti-interference of dual reverse arc core pulling without the need for an additional power source, in order to address the above-mentioned technical status quo.

[0008] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the double-tube single-head demolding mold structure includes a fixed mold core and a template located outside the fixed mold core, and also includes...

[0009] The slider is slidably mounted on the fixed mold core along the direction parallel to the mold parting surface. It has a first inclined guide post hole and two parallel racks are fixed thereon.

[0010] There are two gears, both of which are rotatably mounted on the fixed mold core, and each gear can mesh with a corresponding rack;

[0011] Two arc-shaped core pullers are rotatably mounted on a fixed mold core. The two arc-shaped core pullers have opposite bending directions, and each arc-shaped core puller is provided with an arc-shaped tooth segment that meshes with a corresponding gear.

[0012] The middle core is slidably mounted on the slider and located between the two arc-shaped cores. It has a second oblique guide hole that partially overlaps with the first oblique guide hole.

[0013] The inclined guide post is set on the template and passes through the first inclined guide post hole and the second inclined guide post hole. It moves along a preset direction under the drive of the template and can drive the intermediate core puller and the slider to move outward by cooperating with the first inclined guide post hole and the second inclined guide post hole.

[0014] In this process, the inclined guide post first contacts the working surface of the second inclined guide post hole and drives the intermediate core to move outward independently. Then, it contacts the working surface of the first inclined guide post hole and drives the slider to move the intermediate core outward synchronously. When the slider moves outward, it drives the gear to rotate through the rack and pinion. The gear drives the arc-shaped core to rotate along the arc trajectory, thus achieving pre-disengagement from the product.

[0015] To clarify the initial positional relationship between the inclined guide post and the mating working surfaces of the two inclined guide post holes, ensure accurate step-by-step driving timing, and avoid motion interference, preferably, when the slider and the intermediate core are in the non-outward state, the mating working surfaces of the inclined guide post and the first inclined guide post hole, as well as the mating working surfaces of the inclined guide post and the second inclined guide post hole, are offset by a set distance in the slider moving direction. The mating working surface of the second inclined guide post hole is closer to the driving inclined surface of the inclined guide post than the mating working surface of the first inclined guide post hole.

[0016] In order to achieve a stable sliding fit between the intermediate core puller and the slider, limit the movement path of the intermediate core puller, and avoid deviation during the core pulling process, preferably, the slider is provided with a groove for the intermediate core puller to move, and the intermediate core puller forms a sliding fit with the slider through the groove.

[0017] To facilitate the assembly and maintenance of the intermediate core puller, and to improve the clamping stability of the slider on the intermediate core puller and ensure sliding accuracy, preferably, the slider includes a first slider body and a second slider body that are joined together vertically. The slide groove is formed on the joint surface of the first slider body and the second slider body, and the slide groove passes through the relative inner sides of the first slider body and the second slider body. The intermediate core puller is clamped between the first slider body and the second slider body, and its outer wall is fitted with the inner wall of the slide groove to form a sliding fit.

[0018] To precisely constrain the advance movement distance of the intermediate core pull relative to the slider, avoid excessive or insufficient movement, and ensure the reliability of the step-by-step demolding logic, preferably, the intermediate core pull is provided with a positioning pin on its side, and the slider is also provided with a limiting groove communicating with the slide groove; in the injection molding state, the positioning pin is located at the inner end of the limiting groove, and the length of the limiting groove constrains the advance movement distance of the intermediate core pull relative to the slider.

[0019] To ensure stable meshing and transmission between the arc-shaped tooth segment and the gear, and to make the rotation trajectory of the arc-shaped core precise and avoid transmission jamming, preferably, the arc-shaped tooth segment is formed on the outer arc surface of the arc-shaped core, and the curvature center of the outer arc surface coincides with the rotation axis of the arc-shaped core.

[0020] To further limit the rotation path of the arc-shaped core pulling, prevent deviation from the preset trajectory during rotation, and improve the stability and accuracy of the core pulling action, preferably, the arc-shaped core pulling is integrally formed with an arc-shaped guide plate, and the fixed mold core is provided with an arc-shaped trajectory groove adapted to the guide plate. The guide plate is embedded in the arc-shaped trajectory groove and can slide along it to limit the rotation path of the arc-shaped core pulling.

[0021] To clarify the splicing structure of the arc-shaped core pull and the intermediate core pull, ensure the accuracy of the single hole in the jointly formed product, and avoid gaps or misalignments in the forming part, preferably, both arc-shaped core pulls include a splicing section and an independent arc-shaped section. The intermediate core pull has an overlapping section that splices with the splicing section, and the overlapping section is located in the middle of the two independent sections. The independent sections of the two arc-shaped core pulls and the overlapping section of the intermediate core pull are spliced ​​together to form a forming structure for forming a single hole in the product.

[0022] In order to limit the outward movement of the slider and the outward movement of the intermediate core relative to the slider during the injection molding stage, and to avoid mold structure deviation or product size deviation caused by injection pressure, preferably, the template is also provided with a locking block. The locking block can abut against the slider during injection molding and can selectively abut against the intermediate core to limit the outward movement of the slider along its sliding direction and the outward movement of the intermediate core relative to the slider.

[0023] In order to adapt the mold to the scenario of molding multiple products at the same time, ensure that the molding units of each product operate independently and synchronously, and improve production efficiency, preferably, when the mold is used to mold two or more products at the same time, each product is equipped with two gears, two racks, two arc-shaped core pullers and one intermediate core puller; the gears, racks, arc-shaped core pullers and intermediate core pullers corresponding to each product are each grouped and arranged symmetrically or in an array according to the product layout direction.

[0024] Compared with the prior art, the advantages of this utility model are as follows: By setting a sliding slider and a rack fixed on the fixed mold core, and matching it with a gear that meshes with the rack, and an arc-shaped core puller with arc-shaped toothed segments that can mesh with the gear, a middle core puller is slidably set on the slider between the two arc-shaped core pullers, and the middle core puller and the slider are respectively provided with partially overlapping second and first inclined guide post holes; using the inclined guide posts passing through the second and first inclined guide post holes, the middle core puller is driven to move outward separately before the fixed mold and moving mold open, creating an anti-interference gap in advance, and then the slider and the middle core puller are driven to move outward synchronously. Finally, the meshing transmission of the rack and gear drives the two arc-shaped core pullers to rotate synchronously along the arc trajectory for demolding. Since the priority action of the middle core puller can effectively avoid the collision risk when the double arc-shaped core pullers rotate, and the entire transmission mechanism is driven only by the mold opening action, without the need for an additional power source, it simplifies the mold structure, reduces manufacturing costs and maintenance difficulty, and greatly improves the synchronization accuracy of the core puller movement and the reliability of product demolding. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the exploded state structure of the slider and the core component in this embodiment;

[0026] Figure 2 This is a schematic diagram of the cooperation state between the template, the inclined guide post, and the locking block in this embodiment;

[0027] Figure 3 This is a three-dimensional structural diagram of the mold core in this embodiment;

[0028] Figure 4 This is a three-dimensional structural diagram of the slider in this embodiment (the central core and rack are in the installed state);

[0029] Figure 5 This is a schematic cross-sectional view of the structure in this embodiment (where A represents the injection-molded product);

[0030] Figure 6 This is a schematic diagram of the longitudinal cross-sectional structure of this embodiment;

[0031] Figure 7 This is a three-dimensional structural diagram of the arc-shaped core-pulling mechanism in this embodiment;

[0032] Figure 8 This is a three-dimensional structural diagram of the central core-pulling mechanism in this embodiment;

[0033] Figure 9 This is a schematic diagram of the three-dimensional structure after the arc-shaped core puller and the middle core puller are combined in this embodiment. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0035] Figures 1-9 The figure shown is the preferred embodiment of this utility model.

[0036] The dual-tube single-head demolding mold structure in this embodiment mainly includes a fixed mold core 1, a template 2, a slider 3, a rack 4, a gear 5, an arc-shaped core puller 6, an intermediate core puller 7, an inclined guide post 8, and a locking block 10, etc. It aims to solve the problems of existing molds relying on an additional power source, transmission redundancy, and easy interference of the double arc-shaped core puller. Through the synergistic effect of the inclined guide post step-by-step drive, rack and gear transmission, and the intermediate core puller anti-interference design, it achieves precise molding of the double reverse arc grooves without additional power drive and anti-interference demolding.

[0037] The structure and connection relationship of each component in this embodiment are as follows:

[0038] Mold core 1: Reference Figure 3 As shown, the fixed mold core 1 is the core base for mold forming. It has an arc-shaped trajectory groove 1a that is adapted to the arc-shaped core pull 6. The arc-shaped trajectory groove 1a extends along the preset rotation path of the arc-shaped core pull 6 to limit the movement trajectory of the arc-shaped core pull 6. The fixed mold core 1 also has a rotating shaft mounting hole for mounting the gear 5, so that the gear 5 can be rotated and assembled.

[0039] Template 2: Reference Figure 1As shown, the template 2 is located outside the fixed mold core 1 and is arranged at intervals with the fixed mold core 1 along the mold opening and closing direction. A nitrogen spring for springing open is also provided between the two. The side of the template 2 facing the fixed mold core 1 is provided with a mounting groove for fixing the inclined guide post 8 and a bolt hole for installing the locking block 10. The template 2 can move synchronously with the mold opening and closing mechanism to provide driving power for the inclined guide post 8.

[0040] Slider 3: Reference Figures 4 to 6 As shown, the slider 3 is slidably disposed on the top surface of the fixed mold core 1 along the direction parallel to the mold parting surface. The whole consists of a first slider body 3c and a second slider body 3d assembled from upper and lower parts and fastened together by bolts. A groove 3b is provided on the joint surface of the first slider body 3c and the second slider body 3d, penetrating the inner sides of the two. The cross section of the groove 3b is adapted to the outer wall of the intermediate core pull 7.

[0041] The slider 3 has a first inclined guide post hole 3a through it, and the first inclined guide post hole 3a has a working surface 3a1 that cooperates with the inclined guide post 8; the side wall of the slider 3 also has a limiting groove 3e that communicates with the slide groove 3b. The limiting groove 3e extends along the sliding direction of the slider 3, and one end of it is the inner end 3e1 where the positioning pin 7b is located in the injection molding state; two parallel racks 4 are fixed on the slider 3 by screws. The racks 4 extend along the sliding direction of the slider 3, and the tooth surface faces the gear 5 and meshes with the gear 5.

[0042] Rack 4: Reference Figure 4 and Figure 6 As shown, the rack 4 is a straight rack, and each product has two racks 4. The two racks 4 are fixed on the slider 3 according to the set position. The pitch of the rack 4 matches the module of the corresponding gear 5 to ensure that the slider 3 can drive the gear 5 to rotate smoothly when it moves. Limiting bosses can also be set at both ends of the rack 4 to prevent the rack 4 from disengaging from the gear 5 due to excessive movement of the slider 3.

[0043] Gear 5: Reference Figure 3 and Figure 5 As shown, each product has two gears 5, which are rotatably mounted in the shaft mounting hole of the fixed mold core 1 via a rotating shaft; each gear 5 meshes with the corresponding rack 4, and the number of teeth of the gear 5 matches the number of teeth of the arc-shaped tooth segment 6a of the arc-shaped core pull 6, ensuring that the rotation of the gear 5 can synchronously drive the arc-shaped core pull 6 to rotate.

[0044] Arc-shaped core puller 6: Reference Figure 7As shown, each product has two corresponding arc-shaped core pullers 6, and the two arc-shaped core pullers 6 have opposite bending directions. They are respectively rotatably mounted on the fixed mold core 1 via a rotating shaft, and the rotating shaft is clearance-fitted with the fixed mold core 1. An arc-shaped tooth segment 6a is integrally formed on the outer arc surface 6b of each arc-shaped core puller 6. The tooth pitch of the arc-shaped tooth segment 6a is consistent with the module of the gear 5, and the curvature center of the outer arc surface 6b coincides with the rotation axis of the arc-shaped core puller 6, ensuring that the arc-shaped tooth segment 6a and the gear 5 are always stably meshed. An arc-shaped guide piece (6c) is also integrally formed on the arc-shaped core puller 6. The guide piece (6c) is embedded in the arc-shaped trajectory groove 1a of the fixed mold core 1 and is clearance-fitted with the arc-shaped trajectory groove 1a. The arc-shaped core puller 6 includes a splicing section 6d near the middle core puller 7 and an independent section 6e for forming the arc-shaped groove of the product. The end face of the splicing section 6d is attached to the overlapping section 7c of the middle core puller 7.

[0045] Center core pull 7: Reference Figure 8 As shown, each product has one corresponding intermediate core 7. The intermediate core 7 is sandwiched between the first slider body 3c and the second slider body 3d of the slider 3, and its outer wall is in contact with the inner wall of the groove 3b to form a sliding fit. The intermediate core 7 has a second oblique guide post hole 7a that partially overlaps with the first oblique guide post hole 3a. The second oblique guide post hole 7a is a square hole that is adapted to the oblique guide post 8, and the mating working surface 7a1 of the second oblique guide post hole 7a is closer to the driving oblique surface 8a of the oblique guide post 8 than the mating working surface 3a1 of the first oblique guide post hole 3a. The intermediate core 7 has positioning pins 7b on both sides, and the positioning pins 7b are adapted to the limiting groove 3e of the slider 3. The intermediate core 7 has an overlapping section 7c near the end of the product. The overlapping section 7c is spliced ​​with the splicing section 6d of the two arc-shaped cores 6 to form a forming structure 9 for forming a single hole of the product.

[0046] Angled guide post 8: Reference Figure 1 As shown, the inclined guide post 8 is an inclined square column structure. On the side facing the first inclined guide post hole 3a and the second inclined guide post hole 7a, there is a driving inclined surface 8a for transmitting driving force. One end is fixed to the mounting groove of the template 2 by bolts (the square cross section ensures that the inclined guide post 8 does not rotate circumferentially, and the driving force transmission is more stable). The inclined guide post 8 passes through the first inclined guide post hole 3a of the slider 3 and the second inclined guide post hole 7a of the middle core pull 7, and is clearance-fitted with the two square holes. Its axis forms a preset angle with the mold opening and closing direction, ensuring that a stable lateral driving force can be transmitted to the middle core pull 7 and the slider 3 through the driving inclined surface 8a when moving.

[0047] Molded Structure 9: Reference Figure 9 As shown, the molding structure 9 is formed by combining the independent segments 6e of two arc-shaped core pulls 6 and the overlapping segment 7c of the middle core pull 7. Its outer periphery is consistent with the shape of the single hole of the product and is used to mold the single hole structure of the product during injection molding.

[0048] Locked Block 10: Reference Figure 1and Figure 6 As shown, the locking block 10 is a metal block structure, which is fixed in the bolt hole of the template 2 by bolts. In the injection molding state, one end of the locking block 10 abuts against the outer wall of the slider 3, and the other end can selectively abut against the outer end of the intermediate core pull 7, which is used to restrict the slider 3 and the intermediate core pull 7 from moving outward under injection pressure.

[0049] It is worth noting that when the mold is used to simultaneously mold two products, each product is equipped with two gears 5, two racks 4, two arc-shaped core pullers 6, and one intermediate core puller 7. These components are arranged in groups symmetrically or in an array according to the product layout direction. The slider 3 can be configured as a multi-hole structure adaptable to two or more products. The slider 3 has grooves 3b corresponding to the number of intermediate core pullers 7 and first oblique guide post holes 3a. The slider 3 can be a single piece, still using the structure of an upper and lower assembled first slider body 3c and second slider body 3d, only the number of grooves 3b is the same as the number of intermediate core pullers 7, ensuring that each intermediate core puller 7 slides independently.

[0050] The working principle of the double-tube single-head demolding mold structure in this embodiment is as follows:

[0051] 1. Injection Molding Stage: In the mold-closed state, the locking block 10 abuts against the outer wall of the slider 3 and selectively abuts against the outer end of the intermediate core pull 7, restricting their outward movement; the molding structure 9 (the independent sections 6e of the two arc-shaped core pulls 6 + the overlapping section 7c of the intermediate core pull 7) forms a single-hole cavity for the product. The injection molding machine injects molten material into the cavity, and after the material cools and solidifies, a product with double reverse arc-shaped grooves is formed; at this time, the positioning pin 7b is located at the inner end 3e1 of the limiting groove 3e, and the slider 3 and the intermediate core pull 7 are in a state of not moving outward. The inclined guide post 8 (with driving inclined surface 8a) of the inclined square column structure is simultaneously inserted into the square first inclined guide post hole 3a and the second inclined guide post hole 7a, and the mating working surface 7a1 of the second inclined guide post hole 7a is closer to the driving inclined surface 8a of the inclined guide post 8. The two working surfaces are offset by a set distance in the slider movement direction, and there is no circumferential shaking.

[0052] 2. Pre-core pulling stage: The template 2 drives the inclined guide post 8 (inclined square post with driving inclined surface 8a) to move away from the fixed mold core 1. Because the working surface 7a1 of the second inclined guide post hole 7a is closer to the driving inclined surface 8a of the inclined guide post 8, the driving inclined surface 8a of the inclined guide post 8 first contacts the working surface 7a1 of the second inclined guide post hole 7a (the square hole and the square post cooperate to ensure that the force transmission is not offset), pushing the intermediate core pull 7 to move outward along the slide groove 3b; the positioning pin 7b moves outward along the limiting groove 3e with the intermediate core pull 7 until the positioning pin 7b abuts the outer end of the limiting groove 3e, the intermediate core pull 7 stops moving outward alone, and is separated from the single hole of the product and leaves the gap required for the rotation of the two arc-shaped core pull 6. As the inclined guide post 8 continues to move, its driving inclined surface 8a contacts the working surface 3a1 of the first inclined guide post hole 3a (because the two working surfaces are offset by a set distance, the middle core pull is just completed at this time). The slider 3 is driven to move outward along the fixed mold core 1, and the middle core pull 7 moves outward synchronously with the slider 3. When the slider 3 moves outward, the two racks 4 drive the corresponding two gears 5 to rotate in opposite directions. The gears 5, through meshing with the arc-shaped tooth segment 6a, drive the two arc-shaped core pulls 6 with opposite bending directions to rotate in opposite directions around their respective rotation axes along the arc-shaped trajectory grooves 1a of the corresponding bending direction, so that the independent segment 6e of the arc-shaped core pull 6 is accurately disengaged from the two opposite arc-shaped grooves of the product, completing the pre-demolding.

[0053] 3. Mold Opening and Part Removal Stage: After the pre-core pulling is completed, the fixed mold and the moving mold are officially opened, the mold is opened as a whole, and the operator or robotic arm removes the molded product; when the mold is closed, the template 2 drives the inclined guide post 8 (inclined square post with driving inclined surface 8a) to move in the opposite direction, and pushes the slider 3 and the intermediate core pulling 7 to reset in sequence, until the slider 3 and the intermediate core pulling 7 return to the non-outward state, and the mating working surface 7a1 of the second inclined guide post hole 7a is once again in a position closer to the driving inclined surface 8a of the inclined guide post 8, and the two working surfaces maintain a set offset distance; the gear 5 and the arc-shaped core pulling 6 are reset with the reverse transmission of the rack 4, the locking block 10 abuts against the slider 3 and the intermediate core pulling 7 again, the mold returns to the injection molding state, and enters the next production cycle.

[0054] Based on the above structure and working principle, this embodiment relies on the design of "the working surface of the second inclined guide post hole is closer to the inclined guide post driving inclined surface 8a, and the two working surfaces are staggered by a set distance" to accurately realize the step-by-step driving of the inclined guide post to the middle core puller and the slider; combined with the inclined guide post with the inclined square column structure, a stable driving force is transmitted, without the need for an additional power source (such as the hydraulic cylinder mentioned in the background technology), simplifying the structure and reducing maintenance costs; rack and pinion transmission ensures that the double arc core puller 6 rotates synchronously in opposite directions, adapting to the forming requirements of double reverse arc grooves; the middle core puller 7 moves outward first to effectively avoid interference, improve product forming accuracy and production efficiency, and is suitable for mass production of products with double tube single-head arc grooves.

[0055] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. A double-tube single-head demolding mold structure, comprising a fixed mold core (1) and a template (2) located outside the fixed mold core (1), characterized in that, Also includes The slider (3) is slidably mounted on the fixed mold core (1) along the parallel direction of the mold parting surface. It has a first inclined guide post hole (3a) and two parallel racks (4) are fixed on it. Two gears (5) are rotatably mounted on the fixed mold core (1), and each gear (5) can mesh with the corresponding rack (4); Two arc-shaped core pullers (6) are rotatably mounted on the fixed mold core (1). The two arc-shaped core pullers (6) have opposite bending directions. Each arc-shaped core puller (6) is provided with an arc-shaped tooth segment (6a) that meshes with the corresponding gear (5). The middle core puller (7) is slidably disposed on the slider (3) and located between the two arc-shaped core pullers (6), and has a second oblique guide post hole (7a) that partially overlaps with the first oblique guide post hole (3a); An inclined guide post (8) is provided on the template (2) and passes through the first inclined guide post hole (3a) and the second inclined guide post hole (7a). It moves along a preset direction under the drive of the template (2) and can drive the intermediate core puller (7) and the slider (3) to move outward by cooperating with the first inclined guide post hole (3a) and the second inclined guide post hole (7a). In the working state, the inclined guide post (8) first contacts the working surface (7a1) of the second inclined guide post hole (7a) and drives the intermediate core puller (7) to move outward alone. Then it contacts the working surface (3a1) of the first inclined guide post hole (3a) and drives the slider (3) to drive the intermediate core puller (7) to move outward synchronously. When the slider (3) moves outward, it drives the gear (5) to rotate through the rack (4). The gear (5) drives the arc-shaped core puller (6) to rotate along the arc trajectory to achieve pre-disengagement from the product.

2. The double-tube single-head demolding mold structure according to claim 1, characterized in that: When the slider (3) and the intermediate core puller (7) are not moved outward, the working surfaces (3a1) of the inclined guide post (8) with the first inclined guide post hole (3a) and the second inclined guide post hole (7a1) are offset by a set distance in the moving direction of the slider (3). The working surface (7a1) of the second inclined guide post hole (7a) is closer to the driving inclined surface (8a) of the inclined guide post (8) than the working surface (3a1) of the first inclined guide post hole (3a).

3. The double-tube single-head demolding mold structure according to claim 1, characterized in that: The slider (3) is provided with a groove (3b) for the intermediate core puller (7) to move, and the intermediate core puller (7) forms a sliding fit with the slider (3) through the groove (3b).

4. The dual-tube single-head demolding mold structure according to claim 3, characterized in that: The slider (3) includes a first slider body (3c) and a second slider body (3d) that are joined together vertically. The groove (3b) is formed on the joint surface of the first slider body (3c) and the second slider body (3d), and the groove (3b) penetrates the relative inner sides of the first slider body (3c) and the second slider body (3d). The intermediate core (7) is sandwiched between the first slider body (3c) and the second slider body (3d), and its outer wall is fitted with the inner wall of the groove (3b) to form a sliding fit.

5. The double-tube single-head demolding mold structure according to claim 4, characterized in that: The middle core puller (7) is provided with a positioning pin (7b) on its side, and the slider (3) is also provided with a limiting groove (3e) that communicates with the slide groove (3b); In the injection molding state, the positioning pin (7b) is located at the inner end (3e1) of the limiting groove (3e), and the length of the limiting groove (3e) constrains the advance movement distance of the intermediate core puller (7) relative to the slider (3).

6. The double-tube single-head demolding mold structure according to claim 1, characterized in that: The arc-shaped tooth segment (6a) is formed on the outer arc surface (6b) of the arc-shaped core puller (6), and the curvature center of the outer arc surface (6b) coincides with the rotation axis of the arc-shaped core puller (6).

7. The double-tube single-head demolding mold structure according to claim 1, characterized in that: The arc-shaped core puller (6) has an integrally formed arc-shaped guide piece (6c), and the fixed mold core (1) is provided with an arc-shaped track groove (1a) that is adapted to the guide piece (6c). The guide piece (6c) is embedded in the arc-shaped track groove (1a) and can slide along it to limit the rotation path of the arc-shaped core puller (6).

8. The double-tube single-head demolding mold structure according to claim 1, characterized in that: Both of the arc-shaped core pulls (6) include a splicing section (6d) and an arc-shaped independent section (6e). The intermediate core pull (7) has an overlapping section (7c) that is spliced ​​with the splicing section (6d). The overlapping section (7c) is located in the middle of the two independent sections (6e). The independent sections (6e) of the two arc-shaped core pulls (6) and the overlapping section (7c) of the intermediate core pull (7) are spliced ​​together to form a molding structure (9) for molding a single hole in a product.

9. The double-tube single-head demolding mold structure according to claim 1, characterized in that: The template (2) is also provided with a locking block (10). The locking block (10) can abut against the slider (3) during injection molding and can selectively abut against the intermediate core puller (7) to restrict the slider (3) from moving outward along its sliding direction and the intermediate core puller (7) from moving outward relative to the slider (3).

10. The dual-tube single-head demolding mold structure according to any one of claims 1 to 9, characterized in that: When the mold is used to simultaneously form two or more products, each product is equipped with two gears (5), two racks (4), two arc-shaped core pullers (6) and one intermediate core puller (7); Each product has its own set of gears (5), racks (4), arc-shaped core pullers (6) and intermediate core pullers (7), which are arranged symmetrically or in an array according to the product's layout direction.

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