Headgear arc core-draw mold structure

Abstract

This utility model relates to the technical field of headband arc-shaped core-pulling mold structure, specifically to the production of headphone accessories. It includes a front mold and a rear mold, with an arc-shaped core-pulling structure (perpendicular to the mold) positioned vertically between them. The arc-shaped core-pulling structure comprises two arc-shaped core-pulling blocks, a transmission component, and an arc-shaped limiting component. Arc-shaped core pulling is achieved through the opening action of the front and rear molds. The transmission component, through the movement of the rear mold, drives the arc-shaped core-pulling blocks to move in an arc along the corresponding arc-shaped limiting component, detaching them from the headband. This mold structure positions the arc-shaped core-pulling structure vertically along the front and rear molds, directly achieving arc-shaped core pulling through the opening action of the front and rear molds, reducing the number and volume of internal parts. Furthermore, the arc-shaped core-pulling action is directly driven by the opening action of the front and rear molds, and the arc-shaped limiting component accurately restricts the movement trajectory of the arc-shaped core-pulling blocks, ensuring the consistency and accuracy of the core-pulling process.

Description

Technical Field

[0001] This utility model relates to the technical field of headphone accessory production, specifically to the structure of a headband arc-shaped core-pulling mold. Background Technology

[0002] As a widely used audio device, the production quality and efficiency of the headband of headphones are crucial to the overall performance and market competitiveness of the product. Headphone headbands are usually manufactured by injection molding. During the injection molding process, due to the special arc-shaped structure of the headband, an arc-shaped core-pulling mold is required to achieve smooth demolding of the product.

[0003] Currently, in the existing headphone headband arc-shaped core-pulling mold structures, the arc-shaped core-pulling structure is mostly set parallel to the mold, and its driving method mainly includes hydraulic cylinder rod method and servo motor gear method.

[0004] In the hydraulic cylinder-rod drive method, the hydraulic cylinder serves as the power source and is connected to the slider via the rod. When the hydraulic cylinder actuates, the rod drives the slider to move along a preset arc-shaped track, thereby achieving the arc-shaped core-pulling action. Specifically, the piston rod of the hydraulic cylinder extends or retracts, transmitting force to the rod, which then applies force to the slider, enabling the slider to overcome friction and the clamping force of the injection molded part, thus completing the core-pulling process.

[0005] The servo motor gear drive method utilizes the precise control characteristics of the servo motor. The servo motor drives the gear to rotate, and the gear meshes with the rack mounted on the slider. When the servo motor rotates, the rotational motion is converted into linear motion of the slider through the transmission of the gear and rack, thus causing the slider to complete the core-pulling action along the arc track.

[0006] Whether using a hydraulic cylinder lever method or a servo motor gear method, multiple action steps are required to achieve arc-shaped core pulling. In hydraulic cylinder lever drive, the movement of the hydraulic cylinder needs to be precisely controlled, including the extension speed and stroke of the piston rod. At the same time, the connection and motion transmission between the lever and the slider also need to be accurate. Problems in any of these steps may lead to failure of the core pulling action. In servo motor gear drive, the control program of the servo motor needs to be precisely written, and the transmission of the gear and rack also needs to be smooth. Otherwise, problems such as jamming and noise will occur, affecting the accuracy and efficiency of core pulling.

[0007] Existing arc-shaped core-pulling structures require a large number of parts to realize their functions. Taking the hydraulic cylinder and rod method as an example, in addition to the hydraulic cylinder, rod, and slider, a guide device is also needed to ensure the movement trajectory of the slider, as well as a limit device to prevent the slider from moving excessively. In the servo motor and gear method, in addition to the servo motor, gear, and rack, parts such as reducers and couplings are also needed to realize the transmission and adjustment of power. Too many parts not only increase the manufacturing cost of the mold, but also increase the assembly difficulty and maintenance cost of the mold.

[0008] Because the existing arc-shaped core-pulling structure requires large power devices such as hydraulic cylinders and servo motors, as well as transmission devices such as tie rods and gears, the entire mold structure becomes huge. In injection molding machines, the installation space for molds is limited, and excessively large molds will occupy too much space, restrict the efficiency of injection molding machines, and also increase the energy consumption of injection molding machines.

[0009] This utility model was proposed in response to the shortcomings of the existing technology. Utility Model Content

[0010] The existing headphone headband arc-shaped core-pulling mold structure has technical problems such as complex operation, complex structure, many parts and large space occupation.

[0011] The technical solution adopted by this utility model to solve its technical problem is:

[0012] A headband arc-shaped core-pulling mold structure includes a front mold and a rear mold that can move away from or towards each other. An arc-shaped core-pulling structure is provided between the front mold and the rear mold along their vertical direction. The arc-shaped core-pulling structure includes two opposing arc-shaped core-pulling blocks, a transmission component that is pulsatorically connected to the arc-shaped core-pulling blocks, and an arc-shaped limiting component that restricts the arc-shaped core-pulling blocks to move in an arc. The arc-shaped limiting component is located inside the front mold, and the arc-shaped core-pulling blocks are located inside the arc-shaped limiting component. The transmission component is fixedly connected to the rear mold and can move with the rear mold. When the rear mold moves away from the front mold, the transmission component can move away from the front mold in the same direction, and drive the corresponding arc-shaped core-pulling block to move downwards while moving in an arc along the corresponding arc-shaped limiting component, so that the two arc-shaped limiting components move away from each other to achieve arc-shaped core pulling.

[0013] As described above, in the arc-shaped core-pulling mold structure for headbands, the arc-shaped limiting component includes multiple arc-shaped limiting blocks, and the number of arc-shaped limiting blocks is at least two, corresponding one-to-one with the arc-shaped core-pulling block;

[0014] Alternatively, the number of the arc-shaped limiting blocks is four, with each pair of arc-shaped limiting blocks located on both sides of the corresponding arc-shaped core-pulling block.

[0015] As described above, in the headband arc-shaped core-pulling mold structure, each of the arc-shaped limiting blocks and the corresponding arc-shaped core-pulling block is provided with an arc-shaped sliding component. The arc-shaped sliding component includes an arc-shaped groove and an arc-shaped protrusion. The arc-shaped protrusion can be embedded in the arc-shaped groove, and the arc-shaped protrusion can slide relative to the arc-shaped groove to realize the arc-shaped movement of the arc-shaped core-pulling block on the arc-shaped limiting block.

[0016] As described above, in the headband arc-shaped core-pulling mold structure, the rear mold is provided with a clearance hole, which allows the bottom of the arc-shaped limiting block to be inserted when the rear mold and the front mold are closed.

[0017] As described above, in the headband arc-shaped core-pulling mold structure, the transmission component includes a fixed block fixedly connected to the rear mold and a pull rod rotatably connected to the fixed block. The end of the pull rod away from the fixed block is rotatably connected to the corresponding arc-shaped core-pulling block. When the fixed block moves away from the front mold due to the movement of the rear mold, the fixed block can drive the arc-shaped core-pulling block to move downward through the pull rod. During the movement, the pull rod rotates on the fixed block, and the arc-shaped core-pulling block rotates on the pull rod, so that the arc-shaped core-pulling block can move in an arc along the corresponding arc-shaped limiting component.

[0018] In the headband arc-shaped core-pulling mold structure described above, the number of fixing blocks corresponds one-to-one with the number of pull rods.

[0019] As described above, in the headband arc-shaped core-pulling mold structure, the fixing block is located at the bottom of the rear mold, and the rear mold is provided with a first rotating hole for the pull rod to rotate.

[0020] As described above, in the arc-shaped core-pulling mold structure of the headband, the bottom of the arc-shaped core-pulling block is provided with a second rotating hole for the pull rod to rotate. The end of the pull rod extends into the second rotating hole and is rotatably connected to the arc-shaped core-pulling block.

[0021] As described above, the headband arc-shaped core-pulling mold structure is further provided with an auxiliary limiting component. The auxiliary limiting component includes a limiting protrusion. The limiting protrusion has a limiting inclined surface on the side facing the arc-shaped core-pulling block. When the arc-shaped core-pulling block moves in an arc along the corresponding arc-shaped limiting component, the outer surface of the arc-shaped core-pulling block slides downward relative to the limiting inclined surface at the same time.

[0022] As described above, in the headband arc-shaped core-pulling mold structure, the front mold is further provided with an arc-shaped block located between two arc-shaped core-pulling blocks, and the top of the arc-shaped block is arc-shaped.

[0023] The beneficial effects of this utility model are as follows:

[0024] This utility model relates to the technical field of headband arc-shaped core-pulling mold structure, specifically to the production of headphone accessories. It includes a front mold and a rear mold, with an arc-shaped core-pulling structure (perpendicular to the mold) positioned vertically between them. The arc-shaped core-pulling structure comprises two arc-shaped core-pulling blocks, a transmission component, and an arc-shaped limiting component. Arc-shaped core pulling is achieved through the opening action of the front and rear molds. The transmission component, through the movement of the rear mold, drives the arc-shaped core-pulling blocks to move in an arc along the corresponding arc-shaped limiting component, detaching them from the headband. This mold structure positions the arc-shaped core-pulling structure vertically along the front and rear molds, directly achieving arc-shaped core pulling through the opening action of the front and rear molds, reducing the number and volume of internal parts. Furthermore, the arc-shaped core-pulling action is directly driven by the opening action of the front and rear molds, and the arc-shaped limiting component accurately restricts the movement trajectory of the arc-shaped core-pulling blocks, ensuring the consistency and accuracy of the core-pulling process.

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0026] Figure 1 This is one of the structural schematic diagrams of the headband arc-shaped core-pulling mold structure of this utility model;

[0027] Figure 2 This is the second structural schematic diagram of the headband arc-shaped core-pulling mold structure of this utility model;

[0028] Figure 3 This is a top view schematic diagram of the headband arc-shaped core-pulling mold structure of this utility model;

[0029] Figure 4 for Figure 3 Cross-sectional view along line AA;

[0030] Figure 5 This is an exploded view of the headband arc-shaped core-pulling mold structure of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the rear mold of this utility model. Detailed Implementation

[0032] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0033] like Figures 1 to 6As shown, the headband arc-shaped core-pulling mold structure of this embodiment includes a front mold 1 and a rear mold 2 that can move away from or close to each other. An arc-shaped core-pulling structure (i.e., the arc-shaped core-pulling structure is perpendicular to the mold) is provided between the front mold 1 and the rear mold 2 along their vertical direction. The arc-shaped core-pulling structure includes two opposing arc-shaped core-pulling blocks 3, a transmission assembly 4 that is drivenly connected to the arc-shaped core-pulling blocks 3, and an arc-shaped limiting assembly 5 that can restrict the arc-shaped core-pulling blocks 3 to achieve arc-shaped movement. The arc-shaped limiting assembly 5 is located inside the front mold 1, and the arc-shaped core-pulling blocks 3 are located inside the arc-shaped limiting assembly 5. The transmission assembly 4 and the rear mold 2 are connected to each other. Mold 2 is fixedly connected and can move with the rear mold 2. When the rear mold 2 moves away from the front mold 1, the transmission component 4 can move away from the front mold 1 along with the movement of the rear mold 2, and drive the corresponding arc-shaped core-pulling block 3 to move downward while moving in an arc along the corresponding arc-shaped limiting component 5, so that the two arc-shaped limiting components 5 move away from each other to achieve arc-shaped core pulling. Arc-shaped core pulling is achieved through the opening action of the front and rear molds. The transmission component 4 drives the arc-shaped core-pulling block 3 to move in an arc along the corresponding arc-shaped limiting component 5 through the movement of the rear mold 2, and disengages from the headphone arc-shaped headband product.

[0034] Preferably, after injection molding is completed, the front mold 1 and the rear mold 2 are in a closed state, the arc-shaped core-pulling block 3 is located at the arc-shaped forming part of the headphone headband product, and plays a forming role in the product. The transmission component 4 is fixedly connected to the rear mold 2, the arc-shaped core-pulling block 3 is located in the arc-shaped limiting component 5, and the arc-shaped limiting component 5 is located in the front mold 1.

[0035] When the injection molding machine drives the rear mold 2 to move away from the front mold 1, the transmission component 4, which is fixedly connected to the rear mold 2, also moves away from the front mold 1 along with the rear mold 2.

[0036] During the movement of the transmission component 4, the corresponding arc-shaped core-pulling block 3 will move. Since the arc-shaped core-pulling block 3 is located inside the arc-shaped limiting component 5, the arc-shaped limiting component 5 will restrict the movement trajectory of the arc-shaped core-pulling block 3, so that the arc-shaped core-pulling block 3 moves in an arc shape along the corresponding arc-shaped limiting component 5 while moving downward. As the rear mold 2 continues to move, the two arc-shaped core-pulling blocks 3 will move away from each other and gradually detach from the headphone arc-shaped headband product, completing the arc-shaped core-pulling action.

[0037] When the next injection molding is needed, the injection molding machine drives the rear mold 2 to move closer to the front mold 1. The transmission component 4 also moves with the rear mold 2, causing the arc-shaped core-pulling block 3 to move in the opposite arc along the arc-shaped limiting component 5, returning to the initial position. The front mold 1 and the rear mold 2 close again, ready for the next injection molding.

[0038] The mold structure sets the arc-shaped core-pulling structure along the vertical direction of the front and rear molds. Compared with the traditional arc-shaped core-pulling structure parallel to the mold, it reduces the complex transmission and connection structure. The combination of the arc-shaped core-pulling block 3, the transmission component 4 and the arc-shaped limiting component 5 is more straightforward. During the mold assembly process, the installation and positioning of each component is easier, reducing the installation difficulty. Ordinary mold assembly workers can complete the installation work after simple training.

[0039] The overall structure has a clear design principle, without too many complex mechanical structures and control links, making it easy to understand and implement. For mold manufacturing companies, it can be put into production quickly, shortening the mold manufacturing cycle.

[0040] Preferably, traditional arc-shaped core-pulling structures require large power devices such as hydraulic cylinders and servo motors, as well as complex transmission mechanisms. These devices and mechanisms occupy a large amount of mold space. However, the structure of this embodiment directly achieves arc-shaped core-pulling through the opening action of the front and rear molds, without the need for additional large power devices. This reduces the number and volume of parts inside the mold, making the mold structure more compact.

[0041] The saved mold space allows the mold to fit better in the injection molding machine, improving the space utilization of the injection molding machine, or it can be used to design larger product molds within the same injection molding machine space, increasing the design flexibility of the mold.

[0042] By reducing the use of components such as hydraulic cylinders, reducers, and couplings, the raw material cost of the mold is reduced. At the same time, the simple structure also reduces the processing steps and processing difficulty in the mold manufacturing process, thus reducing processing costs.

[0043] During the use of molds, due to their simple structure and few parts, the probability of failure is relatively low, which reduces maintenance costs and downtime, and further reduces production costs.

[0044] The simplified mold structure makes the mold design and manufacturing process more efficient. Designers can complete the mold design scheme faster, and manufacturing workers can complete the mold processing and assembly work more quickly. It also reduces the time for debugging the mold because the simple structure is easier to adjust and optimize, and can achieve the ideal injection molding effect more quickly, thus improving the overall efficiency of the mold from design to use.

[0045] Preferably, the arc-shaped core-pulling action of this structure is directly driven by the opening action of the front and rear molds, making the movement process more stable and precise. The arc-shaped limiting component 5 can accurately limit the movement trajectory of the arc-shaped core-pulling block 3, ensuring the consistency and accuracy of the core-pulling process and reducing defects such as product deformation and tearing caused by inaccurate core-pulling action.

[0046] Its simple and compact structure is not prone to jamming, and it can maintain a stable working state during the injection molding process, avoiding product quality problems caused by mechanical failure, thereby improving the yield of injection molding.

[0047] Traditional arc-shaped core-pulling structures have many parts and complex structures, so troubleshooting and repairing them requires a lot of time and effort. In contrast, the structure of this embodiment is simple, has fewer parts, and fewer potential fault points, making it easier to quickly locate and resolve problems once they occur.

[0048] The use of vulnerable parts is reduced, the frequency of parts replacement is lowered, and maintenance costs are saved. At the same time, the simple structure makes daily maintenance easier, and operators can quickly complete maintenance operations such as cleaning and lubrication to ensure the normal operation of the mold.

[0049] like Figures 1 to 6 As shown, this embodiment has four arc-shaped limiting blocks 51. Each pair of arc-shaped limiting blocks 51 is located on either side of the corresponding arc-shaped core-pulling block 3. When the rear mold 2 moves away from the front mold 1, the transmission assembly 4 drives the arc-shaped core-pulling block 3 to move. The two arc-shaped limiting blocks 51 located on either side of the arc-shaped core-pulling block 3 together limit and guide it. The arc-shaped limiting blocks 51 on both sides ensure the stability and accuracy of the arc-shaped core-pulling block 3 during movement, preventing it from shifting or wobbling. The arc-shaped core-pulling block 3 moves downwards and away from each other along the arc-shaped space defined by the two arc-shaped limiting blocks 51, thus achieving core pulling.

[0050] Preferably, the rear mold 2 moves closer to the front mold 1, and the transmission component 4 drives the arc-shaped core-pulling block 3 to move in the opposite direction. The arc-shaped limiting blocks 51 on both sides continue to play their role, ensuring that the arc-shaped core-pulling block 3 returns to its initial position along a precise arc trajectory, so as to ensure the accuracy of the next injection molding.

[0051] Preferably, the arc-shaped limiting blocks 51 on both sides form a more stable constraint on the arc-shaped core-pulling block 3. During the core-pulling and resetting process, it can effectively prevent the arc-shaped core-pulling block 3 from shifting or shaking laterally. Especially in the case of high-speed mold opening and closing, this double-sided limiting design can ensure the stability of the movement of the arc-shaped core-pulling block 3 and reduce core-pulling failures caused by vibration or external force interference.

[0052] Preferably, the double-sided limiting makes the force on the arc-shaped core-pulling block 3 more uniform and reduces local wear. This not only helps to improve the accuracy of the core-pulling action and ensure the dimensional accuracy and surface quality of the product, but also extends the service life of the arc-shaped core-pulling block 3 and the arc-shaped limiting block 51, and reduces the maintenance cost and replacement frequency of the mold.

[0053] In other embodiments, the arc-shaped limiting component 5 includes a plurality of arc-shaped limiting blocks 51, the number of which is at least two, corresponding one-to-one with the arc-shaped core-pulling block 3;

[0054] Preferably, when the injection molding machine drives the rear mold 2 to move away from the front mold 1, the transmission component 4, which is fixedly connected to the rear mold 2, moves accordingly, thereby driving the arc-shaped core-pulling block 3 to move. Since each arc-shaped core-pulling block 3 corresponds to an arc-shaped limiting block 51, the arc-shaped core-pulling block 3 will move along the arc-shaped trajectory defined by the corresponding arc-shaped limiting block 51 under the drive of the transmission component 4. During the movement, the arc-shaped limiting block 51 provides precise guidance for the arc-shaped core-pulling block 3, so that the arc-shaped core-pulling block 3 can move downward and away from each other according to the preset arc-shaped path, thereby successfully separating from the headphone arc-shaped headband product and completing the arc-shaped core-pulling action.

[0055] The injection molding machine drives the rear mold 2 to move closer to the front mold 1, and the transmission component 4 drives the arc-shaped core-pulling block 3 to move in the opposite direction. At this time, the arc-shaped core-pulling block 3 still moves along the arc trajectory of the corresponding arc-shaped limit block 51, returning to the initial molding position to prepare for the next injection molding.

[0056] Preferably, multiple arc-shaped limiting blocks 51 correspond one-to-one with arc-shaped core-pulling blocks 3. This one-to-one correspondence design reduces the number of parts inside the mold, making the mold structure simpler. Compared with complex limiting structures, this design occupies less mold space, which is conducive to the overall layout and miniaturization design of the mold, and also reduces the manufacturing difficulty and cost of the mold.

[0057] Preferably, each arc-shaped core-pulling block 3 has a dedicated arc-shaped limiting block 51 for guidance, which can provide a precise movement trajectory for the arc-shaped core-pulling block 3. This helps to improve the accuracy and consistency of the core-pulling action, reduce product defects caused by core-pulling deviation, and improve the quality of injection-molded products.

[0058] You can choose the appropriate design based on your actual needs.

[0059] like Figures 1 to 6 As shown, each of the arc-shaped limiting blocks 51 in this embodiment is provided with an arc-shaped sliding component between it and the corresponding arc-shaped core-pulling block 3. The arc-shaped sliding component includes an arc-shaped groove 52 and an arc-shaped protrusion 31. The arc-shaped protrusion 31 can be embedded in the arc-shaped groove 52, and the arc-shaped protrusion 31 can slide relative to the arc-shaped groove 52 to realize the arc-shaped movement of the arc-shaped core-pulling block 3 on the arc-shaped limiting block 51.

[0060] Preferably, when the injection mold opens, the rear mold gradually moves away from the front mold, and the transmission component connected to the rear mold begins to drive the arc-shaped core-pulling block to move. At this time, since the arc-shaped protrusion is embedded in the arc-shaped groove, the arc-shaped core-pulling block will slide relative to the arc-shaped groove under the drive of the transmission component. Because the arc-shaped groove is a pre-designed arc-shaped trajectory, the arc-shaped core-pulling block will move downward and away from each other according to this arc-shaped trajectory, thereby realizing the action of pulling out the core from the headphone arc-shaped headband product, so that the product can be demolded smoothly.

[0061] The injection molding machine drives the rear mold to approach the front mold to perform the mold closing action. The transmission component drives the arc-shaped core-pulling block to move in the opposite direction. The arc-shaped protrusion still slides relative to the arc-shaped groove, but the sliding direction is opposite to that when the mold opens. During this process, the arc-shaped core-pulling block returns to the initial molding position along the trajectory of the arc-shaped groove, preparing for the next injection molding.

[0062] Preferably, the combination of the arc-shaped groove and the arc-shaped protrusion provides a very precise motion trajectory for the arc-shaped core-pulling block. The shape of the arc-shaped groove determines the movement path of the arc-shaped core-pulling block, so that the core-pulling and resetting processes can be carried out strictly according to the design requirements. This helps to ensure the consistency of the movement position and direction of the arc-shaped core-pulling block during multiple mold opening and closing processes, thereby improving the dimensional accuracy and quality stability of the injection molded product. For example, for products such as the arc-shaped headband of headphones, which have high requirements for shape and dimensional accuracy, precise core-pulling action can ensure that the arc shape of the product meets the design standards and reduce problems such as product deformation or dimensional discrepancies caused by core-pulling deviation.

[0063] Furthermore, the design of the arc-shaped sliding component makes the contact between the arc-shaped core-pulling block and the arc-shaped limiting block a sliding friction. Through the cooperation of the arc-shaped groove and the arc-shaped protrusion, the contact area can be relatively large and evenly distributed. This design can effectively reduce the pressure per unit area, reduce friction and wear. Compared with other possible sliding methods, the arc-shaped sliding component can better adapt to the movement characteristics of the arc-shaped core-pulling block and extend the service life of mold components. This not only reduces the maintenance cost and replacement frequency of the mold, but also improves the overall reliability and stability of the mold, and reduces production interruptions and maintenance time caused by component wear.

[0064] Preferably, the tight fit between the arc-shaped groove and the arc-shaped protrusion can effectively limit the shaking and displacement of the arc-shaped core-pulling block during the movement. During the core-pulling and resetting process, the arc-shaped protrusion slides stably in the arc-shaped groove without sudden jumping or jamming. This makes the movement of the arc-shaped core-pulling block smoother, reduces the impact on the mold and the product, and the smooth movement helps to improve the service life of the mold. At the same time, it can also avoid defects such as scratches and tears on the product surface caused by unstable movement, thus improving the appearance quality of the product.

[0065] Preferably, the design of the arc-shaped sliding component enhances the connection stability between the arc-shaped core-pulling block and the arc-shaped limiting block. The arc-shaped protrusion is embedded in the arc-shaped groove, forming a connection method similar to a mortise and tenon structure, which can provide certain constraints and support in all directions. This structural stability helps to resist various external forces and vibrations generated during mold opening and closing, ensuring that the mold can operate normally in complex working environments, and improving the overall performance and reliability of the mold.

[0066] like Figures 1 to 6 As shown, the rear mold 2 in this embodiment is provided with a clearance hole 21, which allows the bottom of the arc-shaped limiting block 51 to be inserted when the rear mold 2 and the front mold 1 are closed.

[0067] Preferably, when the injection molding machine drives the rear mold 2 to move towards the front mold 1 for mold closing operation, the arc-shaped limiting block 51 remains relatively stationary or performs corresponding auxiliary movements with a specific mechanism. As the rear mold 2 gradually approaches the front mold 1, the bottom of the arc-shaped limiting block 51 aligns with the clearance hole 21 on the rear mold 2. When the rear mold 2 and the front mold 1 are fully closed, the bottom of the arc-shaped limiting block 51 is just inserted into the clearance hole 21. At this time, the mold forms a complete closed cavity, preparing for injection molding.

[0068] After injection molding is completed, the injection molding machine drives the rear mold 2 away from the front mold 1 to perform the mold opening action. As the rear mold 2 moves, the bottom of the arc-shaped limiting block 51 is pulled out from the clearance hole 21, creating conditions for subsequent core pulling and product demolding actions.

[0069] Preferably, the cooperation between the clearance hole 21 and the bottom of the arc-shaped limiting block 51 plays a precise positioning role. During the mold closing process, the bottom of the arc-shaped limiting block 51 is inserted into the clearance hole 21, which acts like a positioning pin to ensure that the rear mold 2 and the front mold 1 are accurately aligned during mold closing, thus avoiding misalignment of the mold in the horizontal and vertical directions.

[0070] Furthermore, this design allows the arc-shaped limiting block 51 to be partially embedded inside the rear mold 2 during mold closing, making full use of the space inside the mold. Within the limited mold space, by rationally arranging the positions of the clearance hole 21 and the arc-shaped limiting block 51, interference between components can be avoided, making the mold structure more compact. This is especially important for some injection molding machines with limited space or for situations where multiple products need to be molded simultaneously in one mold, as it can improve the overall utilization rate of the mold and reduce production costs.

[0071] Preferably, when the bottom of the arc-shaped limiting block 51 is inserted into the clearance hole 21, it forms a more stable overall structure with the rear mold 2. During the injection molding process, the mold will be impacted by the high-pressure plastic melt. If the mold structure is unstable, it is easy to cause mold deformation and affect product quality. The cooperation between the clearance hole 21 and the arc-shaped limiting block 51 can enhance the structural strength and stability of the mold in the mold closing state, resist the injection pressure, ensure that the mold works normally in the high-pressure environment, and extend the service life of the mold.

[0072] Preferably, after mold opening, the arc-shaped limiting block 51 separates from the rear mold 2, which will not hinder the subsequent core pulling action. The arc-shaped core pulling block can smoothly perform the core pulling operation according to the predetermined trajectory, extract the core from the product, and enable the product to be demolded smoothly. This design reasonably separates and coordinates the mold closing positioning and core pulling action, ensuring the continuity and smoothness of the mold working process and improving production efficiency.

[0073] like Figures 1 to 6 As shown, the transmission component 4 in this embodiment includes a fixed block 41 fixedly connected to the rear mold 2 and a pull rod 42 rotatably connected to the fixed block 41. The end of the pull rod 42 away from the fixed block 41 is rotatably connected to the corresponding arc-shaped core-pulling block 3. When the fixed block 41 moves away from the front mold 1 due to the movement of the rear mold 2, the fixed block 41 can drive the arc-shaped core-pulling block 3 to move downward through the pull rod 42. During the movement, the pull rod 42 rotates on the fixed block 41, and the arc-shaped core-pulling block 3 rotates on the pull rod 42, so that the arc-shaped core-pulling block 3 can move in an arc along the corresponding arc-shaped limiting component 5.

[0074] Preferably, after injection molding is completed, the injection molding machine drives the rear mold 2 to move away from the front mold 1. Since the fixed block 41 is fixedly connected to the rear mold 2, the fixed block 41 will move backward along with the rear mold 2. At this time, one end of the pull rod 42, which is rotatably connected to the fixed block 41, is driven to move backward by the fixed block 41, while the other end of the pull rod 42 is rotatably connected to the arc-shaped core-pulling block 3. During this process, the pull rod 42 will rotate on the fixed block 41, and the arc-shaped core-pulling block 3 will also rotate on the pull rod 42. Since the arc-shaped core-pulling block 3 is restricted by the arc-shaped limiting component 5, it can only move along the arc-shaped trajectory specified by the arc-shaped limiting component 5. As the rear mold 2 continues to move, the fixed block 41 continuously applies pulling force through the pull rod 42, eventually driving the arc-shaped core-pulling block 3 to move downward along the arc-shaped trajectory, realizing the action of extracting the core from the molded product.

[0075] When the mold needs to be closed again for the next injection molding, the injection molding machine drives the rear mold 2 to move forward to the front mold 1. The fixed block 41 moves forward with the rear mold 2, and the pull rod 42 is pushed forward. It also rotates on the fixed block 41 and the arc-shaped core-pulling block 3. During this process, the pull rod 42 pushes the arc-shaped core-pulling block 3 to move upward along the arc-shaped trajectory of the arc-shaped limiting component 5, returning to the initial position when the mold is closed, and preparing for the next injection molding.

[0076] For products with curved inner cavities, such as headphone headbands, ordinary straight core-pulling methods cannot meet the demolding requirements. Through the design of this transmission component 4, the curved core-pulling block 3 can move along the curved trajectory, thus smoothly pulling the core out of the product's curved inner cavity. This complex core-pulling action allows the mold to adapt to the molding of products with special shape requirements, expanding the application range of the mold and improving production flexibility.

[0077] Since the tie rod 42, the fixed block 41, and the arc-shaped core-pulling block 3 are all rotatably connected, the movement between the components is smoother during the core-pulling and resetting process, avoiding rigid collisions and excessive friction. Compared with some core-pulling mechanisms that use rigid connections, this rotatable connection method can reduce wear between mold components, extend the service life of the mold, and reduce the maintenance cost of the mold.

[0078] The arc-shaped limiting component 5 provides precise trajectory guidance for the movement of the arc-shaped core-pulling block 3. Under the action of the transmission component 4, the arc-shaped core-pulling block 3 can move accurately along the arc-shaped limiting component 5, ensuring the accuracy of the core-pulling action. This is crucial for ensuring the dimensional accuracy and surface quality of the product, effectively reducing product defects caused by inaccurate core pulling, and improving the product yield.

[0079] The structural design of the transmission component 4 makes the connection between the various components tight and reasonable. During the core pulling and resetting process, the fixed block 41, the pull rod 42 and the arc-shaped core pulling block 3 can work together to form a stable motion system. This stability and reliability ensure that the mold can run continuously and stably during long-term production, reduce production interruptions caused by mechanical failures and improve production efficiency.

[0080] like Figures 1 to 6 As shown, the number of fixing blocks 41 in this embodiment corresponds one-to-one with the number of pull rods 42.

[0081] Preferably, in this mold system, when the rear mold 2 performs the mold opening or closing action, since the fixed block 41 is fixedly connected to the rear mold 2, the fixed block 41 will move synchronously with the rear mold 2. Because the number of fixed blocks 41 corresponds one-to-one with the number of tie rods 42, each fixed block 41 can independently drive the tie rod 42 connected to it to move.

[0082] During the mold opening process, the rear mold 2 moves away from the front mold 1, and each fixed block 41 moves backward and drives the corresponding pull rod 42 through a rotational connection. The pull rod 42, in turn, drives the corresponding arc-shaped core-pulling block 3 through a rotational connection. Since the pull rods 42 driven by each fixed block 41 are independent of each other, they can apply tension to each arc-shaped core-pulling block 3 according to the distribution and movement requirements of the arc-shaped core-pulling block 3, so that the arc-shaped core-pulling block 3 moves in an arc along the arc-shaped limiting component 5, thereby realizing the action of pulling out the core from the molded product.

[0083] During the mold closing process, the rear mold 2 moves to the front mold 1, the fixed block 41 moves forward and pushes the corresponding pull rod 42, and the pull rod 42 then pushes the corresponding arc-shaped core-pulling block 3 back to the initial position along the arc trajectory, in preparation for the next injection molding.

[0084] The preferred one-to-one design ensures that each arc-shaped core-pulling block 3 has an independent transmission path. Through the combination of independent fixing block 41 and pull rod 42, the movement of each arc-shaped core-pulling block 3 can be precisely controlled according to actual needs, ensuring the accuracy and consistency of the core-pulling action.

[0085] When a fixed block 41 or a tie rod 42 is damaged or worn, since they are in a one-to-one correspondence, the damaged part can be easily replaced individually without affecting the normal operation of other transmission components. This greatly reduces the maintenance difficulty and cost of the mold and reduces production downtime caused by component damage. At the same time, during the debugging and optimization of the mold, adjustments can also be made to individual fixed blocks 41 and tie rods 42, improving the maintainability and operability of the mold.

[0086] The independent transmission path makes the movement of each arc-shaped core-pulling block 3 independent of each other, avoiding the impact of a failure in one transmission link on the movement of other arc-shaped core-pulling blocks 3. Even if one of the fixed blocks 41 or the tie rod 42 has a problem, the other parts can still work normally, ensuring the reliability and stability of the mold to a certain extent. This design can reduce the overall failure rate of the mold, improve production efficiency, and reduce the scrap rate of products caused by mold failure.

[0087] like Figures 1 to 6 As shown, in this embodiment, the fixing block 41 is located at the bottom of the rear mold 2, and the rear mold 2 is provided with a first rotating hole 22 for the pull rod 42 to rotate.

[0088] Preferably, when the mold opens, the rear mold 2 moves away from the front mold 1. Since the fixing block 41 is fixed at the bottom of the rear mold 2, the fixing block 41 moves backward synchronously with the rear mold 2. At this time, one end of the pull rod 42 is rotatably connected to the fixing block 41, and the other end is rotatably connected to the arc-shaped core-pulling block 3. The first rotating hole 22 in the rear mold 2 provides the pull rod 42 with rotation space and support point. As the rear mold 2 moves backward, the fixing block 41 pulls the pull rod 42. The pull rod 42 rotates with the first rotating hole 22 as the fulcrum, thereby driving the arc-shaped core-pulling block 3 connected to it to move in an arc along the arc-shaped limiting component 5, realizing the action of pulling out the core from the molded product.

[0089] When the mold is closed, the rear mold 2 moves towards the front mold 1. The fixing block 41 moves forward with the rear mold 2. The fixing block 41 pushes the pull rod 42. The pull rod 42 also rotates in the opposite direction with the first rotating hole 22 as the fulcrum, thereby pushing the arc-shaped core-pulling block 3 back to the initial position along the arc-shaped limiting component 5, preparing for the next injection molding.

[0090] Placing the fixing block 41 at the bottom of the rear mold 2 makes full use of the space at the bottom of the mold and avoids the spatial interference problem that may be caused by setting the fixing block 41 in other parts of the mold. This layout makes the overall structure of the mold more compact and allows for the rational arrangement of various components within the limited mold space. This is beneficial for the installation and use of the mold on the injection molding machine, and also facilitates the layout of equipment around the mold, thereby improving the space utilization rate of the production workshop.

[0091] Furthermore, the first rotating hole 22 provided in the rear mold 2 provides stable rotation support for the tie rod 42. During the mold opening and closing process, the tie rod 42 rotates in the first rotating hole 22, which can ensure the accuracy and stability of its movement trajectory. This design can reduce the shaking and deviation of the tie rod 42 during the movement process, making the movement of the arc-shaped core-pulling block 3 more stable, thereby improving the accuracy and reliability of the core-pulling action and helping to ensure the molding quality of the product.

[0092] From a manufacturing process perspective, machining the first rotating hole 22 inside the rear mold 2 is relatively convenient. Conventional machining methods can be used for precise machining, ensuring the dimensional accuracy and surface quality of the rotating hole. At the same time, the assembly process of installing the fixing block 41 at the bottom of the rear mold 2, and installing the pull rod 42 inside the first rotating hole 22 and rotating it with the fixing block 41 and the arc-shaped core-pulling block 3 is also relatively simple, reducing the manufacturing difficulty and assembly cost of the mold and improving production efficiency.

[0093] The fixing block 41 is located at the bottom of the rear mold 2. During the mold opening and closing process, the movement of the rear mold 2 can be directly transmitted to the tie rod 42 through the fixing block 41. The first rotating hole 22 provides the tie rod 42 with a suitable rotation angle and force transmission path, so that the movement force of the rear mold 2 can be effectively converted into the core pulling and resetting power of the arc-shaped core pulling block 3, reducing the loss in the force transmission process, improving the movement efficiency of the mold, and ensuring that the arc-shaped core pulling block 3 can accurately complete the core pulling and resetting actions.

[0094] like Figures 1 to 6 As shown, the bottom of the arc-shaped core-pulling block 3 in this embodiment is provided with a second rotating hole 32 for the pull rod 42 to rotate. The end of the pull rod 42 extends into the second rotating hole 32 and is rotatably connected to the arc-shaped core-pulling block 3.

[0095] Preferably, when the mold begins to open, the rear mold moves backward. Since the fixing block is fixed to the bottom of the rear mold, it moves along with the rear mold. At this time, the other end of the pull rod, which is rotatably connected to the fixing block, rotates within the second rotating hole at the bottom of the arc-shaped core-pulling block. As the rear mold continues to move backward, the pull rod rotates with the second rotating hole as a pivot point and the first rotating hole (the hole in the rear mold for the pull rod to rotate) as a fulcrum. This rotation causes the pull rod to apply a pulling force to the arc-shaped core-pulling block, thereby driving the arc-shaped core-pulling block to move in an arc along the arc-shaped limiting component, pulling the arc-shaped core-pulling block out of the molded product and completing the core-pulling action.

[0096] During mold closing, the rear mold moves forward, and the fixing block moves forward as well. The pull rod rotates in the opposite direction within the second rotating hole, while simultaneously swinging in the opposite direction around the first rotating hole as a fulcrum. The pull rod applies a pushing force to the arc-shaped core-pulling block, pushing the arc-shaped core-pulling block back to its initial position along the arc-shaped limiting assembly, preparing for the next injection molding.

[0097] By setting a second rotating hole at the bottom of the arc-shaped core-pulling block, the pull rod can rotate flexibly in it, thus cleverly converting the linear motion of the rear mold into the arc-shaped motion of the arc-shaped core-pulling block. This motion conversion method can meet the core-pulling requirements of specific products, especially for molded products with arc-shaped structures, making the core-pulling action more precise and efficient, and ensuring that the product is successfully demolded.

[0098] The end of the pull rod extends into the second rotating hole and is rotatably connected to the arc-shaped core-pulling block, providing a stable connection between the two. During the mold opening and closing process, the motion force of the rear mold can be effectively transmitted to the arc-shaped core-pulling block. Whether it is the pulling force during core pulling or the pushing force during reset, it can be accurately applied to the arc-shaped core-pulling block, reducing the loss and deviation in the force transmission process and ensuring the reliability of the core pulling and reset actions.

[0099] The second rotating hole provides precise positioning and constraint for the rotation of the pull rod, making the pull rod more stable during movement. This helps reduce the shaking and vibration of the arc-shaped core-pulling block during movement, ensuring that it moves along the predetermined arc trajectory. Stable movement can improve the core-pulling accuracy and avoid damage to the product caused by instability during the core-pulling process, thereby improving the molding quality of the product.

[0100] From the perspective of mold maintenance and repair, the design of the second rotating hole makes the connection between the tie rod and the arc-shaped core-pulling block somewhat detachable. If the tie rod or the arc-shaped core-pulling block is damaged or worn, it is easy to remove the tie rod from the second rotating hole for replacement or repair, which reduces the maintenance cost and repair difficulty of the mold and improves the service life and maintainability of the mold.

[0101] This design makes the connection structure between the tie rod and the arc-shaped core-pulling block more compact, reducing additional connecting parts and space occupation. In cases where the internal space of the mold is limited, it can optimize the overall layout of the mold, improve the space utilization of the mold, and make the mold structure more reasonable and compact.

[0102] like Figures 1 to 6 As shown, the rear mold 2 in this embodiment is also provided with an auxiliary limiting component. The auxiliary limiting component includes a limiting protrusion 23. The limiting protrusion 23 has a limiting inclined surface 24 on the side facing the arc-shaped core-pulling block 3. When the arc-shaped core-pulling block 3 moves in an arc along the corresponding arc-shaped limiting component 5, the outer side of the arc-shaped core-pulling block 3 slides downward relative to the limiting inclined surface 24 at the same time.

[0103] Preferably, when the mold opens and the rear mold separates from the front mold, the arc-shaped core-pulling block moves in an arc shape along the arc-shaped limiting component under the action of the pull rod and other driving mechanisms. During this process, the outer surface of the arc-shaped core-pulling block will contact the limiting inclined surface on the limiting protrusion. Due to the arc-shaped movement trajectory of the arc-shaped core-pulling block, its outer surface will slide relative to the limiting inclined surface. The inclination angle of the limiting inclined surface will constrain and guide the movement of the arc-shaped core-pulling block, so that while the arc-shaped core-pulling block moves in an arc shape, it will also have a downward component movement, further ensuring that the arc-shaped core-pulling block can be accurately pulled out of the molded product and avoiding interference with the product during the core-pulling process.

[0104] During mold closing, the arc-shaped core-pulling block moves in the opposite direction under the action of the drive mechanism, returning to its initial position along the arc-shaped limiting component. At this time, the outer surface of the arc-shaped core-pulling block will slide upward relative to the limiting slope. The limiting slope provides precise guidance for the reset movement of the arc-shaped core-pulling block, ensuring that the arc-shaped core-pulling block can accurately return to its original molding position, preparing for the next injection molding.

[0105] The presence of the limiting inclined surface further constrains and guides the movement of the arc-shaped core-pulling block. During the core-pulling process, it ensures that the arc-shaped core-pulling block moves along the predetermined trajectory and angle, avoiding unsmooth core-pulling or product damage due to movement deviation. By precisely controlling the movement of the arc-shaped core-pulling block, the accuracy of core-pulling is improved, enabling the molded product to be demolded smoothly and reducing the product defect rate.

[0106] The auxiliary limiting component increases the stability of the arc-shaped core-pulling block's movement. The contact between the limiting inclined surface and the outer side of the arc-shaped core-pulling block provides additional support and constraint, reducing the swaying and vibration of the arc-shaped core-pulling block during movement. This stability helps ensure the normal operation of the mold, extends the mold's service life, and also improves the molding quality of the product.

[0107] During the core-pulling process, if the movement of the arc-shaped core-pulling block is inaccurate, it may collide or rub against the molded product, thereby damaging the product. The guiding effect of the limiting slope allows the arc-shaped core-pulling block to be smoothly pulled out of the product, avoiding damage to the product.

[0108] The design of the auxiliary limiting components makes the mold structure more reasonable and complete. The cooperation between the limiting protrusion and the arc-shaped core-pulling block forms a relatively independent limiting system, which complements the arc-shaped limiting components and together ensures the movement accuracy and stability of the arc-shaped core-pulling block. This optimized structural design helps to improve the overall performance of the mold and reduce the design and manufacturing costs of the mold.

[0109] During mold debugging, the presence of the limiting ramp can serve as an intuitive reference, making it convenient for debugging personnel to adjust the motion parameters of the arc-shaped core-pulling block. At the same time, when the mold needs maintenance or repair, the structure of the limiting protrusion and the limiting ramp is relatively simple, making it easy to inspect and replace, thus reducing the difficulty and cost of mold maintenance.

[0110] like Figures 1 to 6 As shown, the front mold 1 of this embodiment also has an arc-shaped block 11 located between two arc-shaped core-pulling blocks 3, the top of which is arc-shaped. This is to accommodate the movement path of the arc-shaped ends of the two arc-shaped core-pulling blocks 3 and to conform to the shape of the arc-shaped headband product.

[0111] Preferably, when the mold is closed, the front mold and the rear mold approach each other and close. The two arc-shaped core-pulling blocks move towards the middle and gradually approach the arc-shaped block located between them. Since the top of the arc-shaped block is arc-shaped, it is adapted to the moving path of the arc-shaped ends of the two arc-shaped core-pulling blocks. The arc-shaped core-pulling blocks can accurately move along the predetermined arc trajectory to the position that matches the arc-shaped block. At this time, the arc-shaped block, the arc-shaped core-pulling block and other parts of the mold together form a complete cavity, providing precise space for injection molding.

[0112] After the mold closes to form a complete cavity, the molten plastic is injected into the cavity. The shape of the arc-shaped block conforms to the shape of the arc-shaped headband product. As part of the cavity, it plays a role in constraining and shaping the molten plastic. The molten plastic flows and fills the cavity, and finally solidifies and forms the arc-shaped headband product according to the shape of the arc-shaped block and the entire cavity.

[0113] When the mold opens, the front mold and the rear mold separate, and the arc-shaped core-pulling block moves outward along its arc trajectory. Because the arc design at the top of the arc-shaped block matches the arc end movement path of the arc-shaped core-pulling block, the arc-shaped core-pulling block can be smoothly pulled out from the molded product and the arc-shaped block without interfering with the arc-shaped block and the molded product, ensuring that the product can be demolded smoothly.

[0114] The arc shape design of the top of the arc block is adapted to the arc end movement path of the arc core block and conforms to the shape of the arc headband product. This precise matching enables the product to have accurate molding space during the injection molding process, ensuring the shape and dimensional accuracy of the arc headband product. For some arc headband products with high requirements for shape and size, this design can effectively reduce the molding error of the product and improve the quality and consistency of the product.

[0115] During the mold opening process, the arc-shaped core-pulling block needs to be pulled out from the molded product. Since the top shape of the arc-shaped block matches the movement path of the arc-shaped core-pulling block, the arc-shaped core-pulling block can move smoothly along the predetermined arc trajectory, avoiding collisions and friction with the arc-shaped block and the product during the core-pulling process. This not only reduces the difficulty of core-pulling and improves production efficiency, but also reduces the risk of product damage due to improper core-pulling.

[0116] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A headband-shaped arc-shaped core-pulling mold structure, characterized in that: The system includes a front mold (1) and a rear mold (2) that can move away from or close to each other. An arc-shaped core-pulling structure is provided between the front mold (1) and the rear mold (2) along their vertical direction. The arc-shaped core-pulling structure includes two opposing arc-shaped core-pulling blocks (3), a transmission component (4) that is connected to the arc-shaped core-pulling blocks (3) respectively, and an arc-shaped limiting component (5) that can restrict the arc-shaped core-pulling blocks (3) to move in an arc. The arc-shaped limiting component (5) is located inside the front mold (1), and the arc-shaped core-pulling blocks (3) are located in the arc. Inside the shape limiting component (5), the transmission component (4) is fixedly connected to the rear mold (2) and can move with the rear mold (2). When the rear mold (2) moves away from the front mold (1), the transmission component (4) can move away from the front mold (1) as the rear mold (2) moves, and drive the corresponding arc-shaped core-pulling block (3) to move downward while moving in an arc along the corresponding arc-shaped limiting component (5), so that the two arc-shaped limiting components (5) move away from each other to achieve arc-shaped core pulling.

2. The headband arc-shaped core-pulling mold structure according to claim 1, characterized in that: The arc-shaped limiting component (5) includes multiple arc-shaped limiting blocks (51), and the number of arc-shaped limiting blocks (51) is at least two, corresponding one-to-one with the arc-shaped core-pulling block (3); Alternatively, the number of the arc-shaped limiting blocks (51) is four, with each pair of arc-shaped limiting blocks (51) located on both sides of the corresponding arc-shaped core-pulling block (3).

3. The headband arc-shaped core-pulling mold structure according to claim 2, characterized in that: Each of the arc-shaped limiting blocks (51) and the corresponding arc-shaped core-pulling blocks (3) are provided with an arc-shaped sliding component. The arc-shaped sliding component includes an arc-shaped groove (52) and an arc-shaped protrusion (31). The arc-shaped protrusion (31) can be embedded in the arc-shaped groove (52) and can slide relative to each other along the arc-shaped groove (52) to realize the arc-shaped movement of the arc-shaped core-pulling block (3) on the arc-shaped limiting block (51).

4. The headband arc-shaped core-pulling mold structure according to claim 2, characterized in that: The rear mold (2) is provided with a clearance hole (21), which allows the bottom of the arc-shaped limiting block (51) to be inserted when the rear mold (2) and the front mold (1) are closed.

5. The headband arc-shaped core-pulling mold structure according to claim 1, characterized in that: The transmission assembly (4) includes a fixed block (41) fixedly connected to the rear mold (2) and a pull rod (42) rotatably connected to the fixed block (41). The end of the pull rod (42) away from the fixed block (41) is rotatably connected to the corresponding arc-shaped core-pulling block (3). When the fixed block (41) moves away from the front mold (1) as the rear mold (2) moves, the fixed block (41) can drive the arc-shaped core-pulling block (3) to move downward through the pull rod (42). During the movement, the pull rod (42) rotates on the fixed block (41), and the arc-shaped core-pulling block (3) rotates on the pull rod (42) so that the arc-shaped core-pulling block (3) can move in an arc along the corresponding arc-shaped limiting assembly (5).

6. The headband arc-shaped core-pulling mold structure according to claim 5, characterized in that: The number of fixed blocks (41) corresponds one-to-one with the number of pull rods (42).

7. The headband arc-shaped core-pulling mold structure according to claim 5, characterized in that: The fixing block (41) is located at the bottom of the rear mold (2), and the rear mold (2) is provided with a first rotating hole (22) for the pull rod (42) to rotate.

8. The headband arc-shaped core-pulling mold structure according to claim 5, characterized in that: The bottom of the arc-shaped core-pulling block (3) is provided with a second rotating hole (32) for the pull rod (42) to rotate. The end of the pull rod (42) extends into the second rotating hole (32) and is rotatably connected to the arc-shaped core-pulling block (3).

9. The headband arc-shaped core-pulling mold structure according to claim 1, characterized in that: The rear mold (2) is also provided with an auxiliary limiting component, which includes a limiting protrusion (23). The limiting protrusion (23) has a limiting inclined surface (24) on the side facing the arc-shaped core-pulling block (3). When the arc-shaped core-pulling block (3) moves in an arc along the corresponding arc-shaped limiting component (5), the outer side of the arc-shaped core-pulling block (3) slides downward relative to each other along the limiting inclined surface (24).

10. The headband arc-shaped core-pulling mold structure according to claim 1, characterized in that: The front mold (1) is also provided with an arc block (11) located between two arc-shaped core-pulling blocks (3), and the top of the arc block (11) is arc-shaped.

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