A mechanism and method for core-pulling of an inner arc reverse-docking in an injection mold

Abstract

The application relates to an inner arc-shaped reverse buckle core-pulling mechanism and method in an injection mold, which comprises a slider seat arranged in a mold cavity of the injection mold, wherein a first sliding channel is arranged in the slider seat; an inner slider is slidably arranged in the first sliding channel of the slider seat; a slider core assembly is connected to one end of the slider seat and comprises a slider core seat, a connecting rod and an arc-shaped core; the connecting rod is slidably arranged in the second sliding channel; the arc-shaped core is slidably arranged in the arc-shaped track; a lever assembly comprises a first lever and a second lever; the second lever penetrates through the slider seat and is inserted into a lever hole of the inner slider, so as to drive the inner slider to slide; a shovel is slidably connected to one end of the slider seat away from the slider core assembly; through the structure, the core-pulling of a complex arc-shaped reverse buckle is realized; the whole mechanism is completely driven by the mold opening and closing action, does not need external power sources such as oil cylinders and air cylinders, and is simple and compact in structure and low in cost.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and specifically to an arc-shaped undercut core-pulling mechanism and method for injection molds. Background Technology

[0002] Injection molds are essential process equipment for producing various industrial products. With the rapid development of the plastics industry and the widespread application of plastic products in sectors such as aerospace, electronics, machinery, shipbuilding, and automobiles, the application range of injection molds is becoming increasingly broad. In the field of injection molding, product structures often feature undercuts, requiring a side-pulling mechanism for demolding during mold opening. For linear undercuts, a slider mechanism driven by a slanted guide post can typically achieve core pulling. However, when the product contains curved undercuts, traditional linear sliders cannot move along the curved trajectory, leading to demolding difficulties.

[0003] In the existing technology, in order to solve the problem of demolding of arc-shaped undercuts, an arc-shaped core-pulling mechanism is generally driven by a hydraulic cylinder or a pneumatic cylinder. However, its structure is complex, costly, and occupies a large space. In addition, it depends on an external power source, and its stability is affected by the system pressure.

[0004] Therefore, there is an urgent need to provide a mechanism and method for pulling the core with an arc-shaped undercut inside an injection mold to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and defects of the prior art and provide a core-pulling mechanism and method for arc-shaped undercuts in injection molds, which realizes the core-pulling of complex arc-shaped undercuts; the entire mechanism is driven by the mold opening and closing action, without the need for external power sources such as oil cylinders and air cylinders, and the structure is simple, compact and low cost.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A curved undercut core-pulling mechanism for an injection mold, characterized in that it comprises:

[0008] A slider seat is disposed in the cavity of an injection mold, and the slider seat is provided with a first slide rail inside;

[0009] The inner slider is slidably disposed in the first slide rail inside the slider seat, and the inner slider has a toggle hole that penetrates its upper and lower end faces in the middle.

[0010] A slider core assembly, connected to one end of the slider seat, includes a slider core seat, a connecting rod, and an arc-shaped core. The slider core seat has a second slide rail communicating with the first slide rail inside. The end of the second slide rail away from the first slide rail is connected to an arc-shaped track. The connecting rod is slidably disposed in the second slide rail. The arc-shaped core is slidably disposed in the arc-shaped track and is hinged to one end of the connecting rod via a rotating shaft.

[0011] The lever assembly includes a first lever and a second lever. The first lever is connected to the slider seat and configured to delay driving the slider seat. The second lever passes through the slider seat and is inserted into the actuation hole of the inner slider to drive the inner slider to slide.

[0012] A shovel is slidably connected to the end of the slider seat away from the slider core assembly. Both the upper ends of the shovel and the lever assembly are connected to the front template. During the initial mold opening stage, as the front template detaches upwards, the second lever drives the inner slider to retract within the first slide rail, thereby causing the arc-shaped core to move along the arc-shaped track via the connecting rod, initially pulling the core out of the product's arc-shaped undercut. Simultaneously, the shovel begins to disengage from the slider seat. In subsequent mold opening stages, the second lever disengages from the inner slider's actuation hole, and the first lever begins to drive the entire slider seat to retract, completing the final demolding of the product.

[0013] Optionally, it also includes a pressure strip, wherein at least one side surface of the slider seat is provided with a locking protrusion extending along its length direction, the pressure strip is provided with a limiting groove adapted to the locking protrusion, the pressure strip and the slider seat cooperate with the locking protrusion through the limiting groove, the pressure strip is installed on the mold and provides sliding guidance for the slider seat.

[0014] Optionally, a first limiting glass bead is provided between the pressure strip and the slider seat. The first limiting glass bead has a movable protrusion. Two positioning recesses that cooperate with the movable protrusion of the first limiting glass bead are provided at intervals on the side of the slider seat to limit the stroke of the slider seat between the initial position and the core-pulling completion position.

[0015] Optionally, the distance between the two positioning recesses is equal to the sliding distance of the slider seat driven by the first lever.

[0016] Optionally, both the first lever and the second lever include a vertical section and an inclined section, wherein the inclined section bends from the end of the vertical section toward a direction away from the slider core seat, and the included angle between the two is greater than 90°.

[0017] Optionally, the projected height of the inclined segment of the first lever in the mold opening direction is less than the projected height of the inclined segment of the second lever, so that the second lever completes the driving contact between its inclined segment and the corresponding component before the first lever, thereby realizing the delayed driving of the first lever relative to the second lever.

[0018] Optionally, a second limiting glass bead is provided in the first slide rail, and a limiting groove connected to it is provided at the bottom end of the inner slider. The length of the limiting groove is equal to the sliding distance of the inner slider driven by the second lever.

[0019] Optionally, the arc-shaped core is provided with a first connecting hole, the end of the connecting rod is provided with a second connecting hole, and the rotating shaft is inserted into the first connecting hole and the second connecting hole so that the arc-shaped core can rotate around the axis of the rotating shaft.

[0020] Optionally, one end of the connecting rod is provided with a T-shaped head, and the inner slider is provided with a T-shaped slot that matches the T-shaped head.

[0021] The present invention also provides a method for pulling the core of an arc-shaped undercut, comprising the following steps:

[0022] The mold opens, and the lever assembly moves upward; the second lever moves upward, causing the inner slider connected to it to retract in the first slide rail, which in turn drives the connecting rod to slide in the second slide rail; the connecting rod drives the arc-shaped core rotatably connected to it to retract along the arc track, so that the arc-shaped core begins to retract and disengage from the arc-shaped undercut of the product; at the same time, the shovel begins to disengage from the slider seat.

[0023] Once the arc-shaped core has disengaged, the lever assembly continues its upward movement; the second lever disengages from the actuation hole, and the first lever, relative to the second lever and its corresponding component, is driven with a delay. The first lever begins to drive the entire slider seat backward. The setting of the first limiting glass bead and the two sets of positioning recesses limits the stroke of the slider seat between the initial position and the core-pulling completion position, so that when the slider seat reaches the core-pulling completion position, the slider core assembly completes the overall disengagement from the product, completing the final demolding of the product.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In this invention, the arc-shaped undercut core-pulling mechanism inside the injection mold includes a slider seat, an inner slider, a slider core assembly, a lever assembly, and a pusher. The slider seat is located within the mold cavity of the injection mold and has a first slide rail extending along its length for sliding connection of the inner slider. The inner slider has a lever hole penetrating its upper and lower end faces in its middle section. The slider core assembly is connected to one end of the slider seat and includes a slider core seat, a connecting rod, and an arc-shaped core. The slider core seat has a second slide rail communicating with the first slide rail, and the end of the second slide rail has an arc-shaped track. One end of the connecting rod is slidably disposed within the second slide rail. One end is hinged to the arc-shaped core via a rotating shaft; the lever assembly is installed in the slider seat and moves upward with the mold opening action. The lever assembly includes a first lever and a second lever; after the second lever passes through the corresponding through hole on the slider seat, its lower end is inserted into the actuation hole of the inner slider. As the second lever moves upward, it drives the inner slider to slide in the first channel; the first lever is connected to the rear end of the slider seat and is designed to have a delayed drive function, that is, the first lever will delay the drive contact with its corresponding component compared to the second lever; the shovel is slidably connected to the slider seat. Through the above component settings, the linear motion of the inner slider is converted into the curved motion of the arc-shaped core through the hinged connecting rod and the preset arc track, thereby realizing the core pulling of complex arc-shaped undercuts; the entire mechanism is driven entirely by the mold opening and closing action, without the need for external power sources such as hydraulic cylinders and pneumatic cylinders, and has a simple and compact structure, reliable operation, and low cost. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure during mold opening in this invention.

[0028] Figure 3 for Figure 2 A cross-sectional schematic diagram.

[0029] Figure 4 This is a schematic diagram of the structure when the arc-shaped core is completely detached in this invention.

[0030] Figure 5 for Figure 4 A cross-sectional schematic diagram.

[0031] Figure 6 This is a schematic diagram of the slider seat in this invention.

[0032] Figure 7 This is a schematic diagram of the pressure strip in this invention.

[0033] Figure 8 This is a schematic diagram of the structure when the connecting rod and the arc-shaped core are connected in this invention.

[0034] The above figures include the following reference numerals:

[0035] 1. Slider seat; 11. First slide rail; 2. Inner slider; 21. Actuating hole; 3. Slider core assembly; 31. Slider core seat; 32. Connecting rod; 321. T-shaped head; 322. T-shaped slot; 33. Arc-shaped core; 34. Second slide rail; 341. Second limiting glass bead; 342. Limiting groove; 35. Arc-shaped track; 36. Rotating shaft; 37. First connecting hole; 38. Second connecting hole; 41. First lever; 411. Vertical section; 412. Inclined section; 42. Second lever; 5. Shovel; 6. Pressure strip; 61. Locking protrusion; 62. Limiting groove; 63. First limiting glass bead; 631. Movable protrusion; 632. Positioning recess. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0037] The present invention proposes an arc-shaped undercut core-pulling mechanism for injection molds.

[0038] Reference Figures 1 to 8 In this embodiment, it includes:

[0039] The slider seat 1 is located inside the cavity of the injection mold, and the slider seat 1 has a first slide rail 11 inside;

[0040] The inner slider 2 is slidably disposed in the first slide rail 11 inside the slider seat 1, and the inner slider 2 is provided with a toggle hole 21 that passes through its upper and lower end faces in the middle.

[0041] The slider core assembly 3, connected to one end of the slider seat 1, includes a slider core seat 31, a connecting rod 32, and an arc-shaped core 33. The slider core seat 31 has a second slide 34 that communicates with the first slide 11. The end of the second slide 34 away from the first slide 11 is connected to an arc-shaped track 35. The connecting rod 32 is slidably disposed in the second slide 34. The arc-shaped core 33 is slidably disposed in the arc-shaped track 35 and is hinged to one end of the connecting rod 32 via a rotating shaft 36.

[0042] The lever assembly includes a first lever 41 and a second lever 42. The first lever 41 is connected to the slider seat 1 and is configured to delay driving the slider seat 1. The second lever 42 passes through the slider seat 1 and is inserted into the actuation hole 21 of the inner slider 2 to drive the inner slider 2 to slide.

[0043] The shovel 5 is slidably connected to the end of the slider seat 1 away from the slider core assembly 3. The upper ends of the shovel 5 and the lever assembly are both connected to the front template. During the mold opening process, in the initial mold opening stage, as the front template detaches upward, the second lever 42 drives the inner slider 2 to retract within the first slide rail 11, and then drives the arc-shaped core 33 to move along the arc-shaped track 35 through the connecting rod 32, so as to initially pull the core out from the arc-shaped undercut of the product. At the same time, the shovel 5 begins to detach from the slider seat 1. In the subsequent mold opening stage, the second lever 42 disengages from the actuation hole 21 of the inner slider 2, and the first lever 41 begins to drive the entire slider seat 1 to retract, completing the final demolding of the product.

[0044] Optionally, in this embodiment, the arc-shaped undercut core-pulling mechanism inside the injection mold includes a slider seat 1, an inner slider 2, a slider core assembly, a lever assembly, and a scraper 5; wherein the slider seat 1 is disposed inside the mold cavity of the injection mold, and has a first slide rail 11 provided inside along the length extension direction for the inner slider 2 to slide; the inner slider 2 is configured as a square slider, which fits tightly in the first slide rail 11 and can slide back and forth along the length direction of the first slide rail 11, and has a lever hole 21 in the middle of the inner slider 2 that penetrates its upper and lower end faces; slider type The core assembly 3 is connected to one end of the slider seat 1 and includes a slider-shaped core seat 31, a connecting rod 32, and an arc-shaped core 33. The slider-shaped core seat 31 is fixed to the end face of the slider seat 1 by screws, and has a second slide 34 inside that communicates with the first slide 11. The end of the second slide 34 (i.e., the side closer to the product) is connected to an arc-shaped track 35 with a specific radius of curvature. One end of the connecting rod 32 is slidably disposed in the second slide 34, and the other end is hinged to the arc-shaped core 33 through a rotating shaft 36. The arc-shaped core 33 then slides... The connecting rod 32 is positioned in the arc-shaped track 35, so that when it slides in the second slide rail 34, it can drive the arc-shaped core 33, which is hinged to it, to disengage from the track. The lever assembly is installed in the slider seat 1 and moves upward with the mold opening action. The lever assembly includes a first lever 41 and a second lever 42. After the second lever 42 passes through the corresponding through hole on the slider seat 1, its lower end is inserted into the actuation hole 21 of the inner slider 2. As the second lever 42 moves upward, it drives the inner slider 2 to slide in the first channel. The first lever 41 is connected to the slider. The rear end of the seat 1 is connected and designed to have a delayed drive function, that is, the first lever 41 will delay the drive contact with its corresponding component compared to the second lever 42; the shovel 5 is slidably connected to the slider seat 1. When the mold is closed, in order to prevent the inner slider 2 from regressing or being ejected due to the impact fluctuations generated by injection molding, the shovel 5 is pressed by the front platen, thereby locking the entire slider mechanism. As the mold opens, the front mold disengages upward, and the shovel 5 slides away from the slider seat 1, thereby enabling the inner slider 2 to perform a regressive action and complete the separation from the product.

[0045] Specific working process: During mold opening, the front template drives the lever assembly and the shovel 5 to move upward; in the initial mold opening stage, the second lever 42 drives the inner slider 2 to slide backward (away from the product direction) in the first slide rail 11 through the lever hole 21; the inner slider 2 pulls the arc core 33 through the connecting rod 32. Since the connecting rod 32 and the arc core 33 are hinged, and the arc core 33 is constrained by the arc track 35, the arc core 33 moves along the arc track 35 in a preset curve, thus smoothly separating from the arc undercut of the product and achieving initial core pulling; at the same time, the shovel 5 moves upward and releases the locking of the slider seat 1; in the subsequent mold opening stage, the second lever 42 completely disengages from the lever hole 21 of the inner slider 2 and no longer drives the inner slider 2; at this time, the first lever 41 begins to drive the slider seat 1 to move away from the product, driving the entire slider core assembly 3 (including the arc core 33 that has completed core pulling) to separate from the product, completing the final demolding.

[0046] By setting the above components, the linear motion of the inner slider 2 is converted into the curved motion of the arc core 33 through the hinged connecting rod 32 and the preset arc track 35, thereby realizing the core pulling of the complex arc undercut; the entire mechanism is driven by the mold opening and closing action, without the need for external power sources such as oil cylinders and air cylinders, and has a simple and compact structure, reliable operation and low cost.

[0047] Optionally, in this embodiment, the inverted core-pulling mechanism further includes a pressure strip 6. On at least one of the left and right sides of the slider seat 1, a locking protrusion 61 extending along its length is machined. Correspondingly, the pressure strip 6 is fixedly installed on the rear template by screws. The inner side of the pressure strip 6 is machined with a limiting groove 62 that perfectly matches the shape of the locking protrusion 61. During installation, the locking protrusion 61 on the side of the slider seat 1 is respectively embedded in the limiting groove 62 of the two pressure strips 6, providing sliding guidance and limiting for the slider seat 1. Through the cooperation of "locking protrusion 61-limiting groove 62", the pressure strip 6 provides a precise and stable sliding guide for the slider seat 1, preventing the slider seat 1 from shifting and warping in the front-back direction, ensuring the straightness and accuracy of the entire core-pulling mechanism's movement. At the same time, this structure is easy to assemble.

[0048] Optionally, in this embodiment, a first limiting glass bead 63 is installed between the pressure strip 6 and the slider seat 1. The first limiting glass bead 63 has a movable protrusion 631, which can protrude from the surface of the pressure strip 6 under the action of a spring. On the side of the slider seat 1, two vertically arranged positioning recesses 632 are machined at intervals along its sliding direction. When the slider seat 1 slides to the initial position (mold closed state), the movable protrusion 631 of the first limiting glass bead 63 engages with the first positioning recess 632. When the slider seat 1 slides towards the core-pulling completion position, the movable protrusion 631 is compressed and retracted. When the slider seat 1 is driven to the core-pulling completion position by the first lever 41, the movable protrusion 631 engages with the second positioning recess 632. Through the mechanical cooperation between the first limiting glass bead 63 and the positioning recesses 632, the slider seat 1 is provided with a clear and perceptible end-of-stroke positioning. This not only prevents the slider seat 1 from overshooting due to inertia, but also ensures that it accurately returns to its initial position each time the mold is closed, greatly improving the reliability and repeatability of the mold operation. Furthermore, in this embodiment, the straight-line distance between the center points of the two positioning recesses 632 is designed to be equal to the sliding distance L required for the first lever 41 to push the slider seat 1 during the delayed drive phase, so that the position of the mechanical limit matches the motion design of the mechanism; when the slider seat 1 is driven to the point where the second positioning recess 632 is engaged with the first limiting glass bead 63, it is exactly the precise position required for the slider core assembly 3 to completely disengage from the product.

[0049] Optionally, in this embodiment, both the first lever 41 and the second lever 42 include a vertical section 411 and an inclined section 412. The inclined section 412 bends away from the end of the vertical section 411 in a direction away from the product. The included angle between the inner sides of the bends of the two levers is greater than 90°, making the contact between the inclined section 412 and the corresponding driving surface on the slider smoother. This allows the vertical tension generated by mold opening to be converted into the horizontal component force of the slider more smoothly, reducing contact impact and wear. Furthermore, in this embodiment, the projection of the inclined section 412 of the first lever 41 in the mold opening direction... The height H1 is less than the projection height H2 of the inclined section 412 of the second lever 42 in the mold opening direction. This height difference is the core of achieving delayed drive. Since H2>H1, at the initial stage of mold opening, the second lever 42 with a larger projection height will first make driving contact with the inner slider 2 and drive it to complete the entire stroke. After the stroke of the second lever 42 is completed, the inclined section 412 of the first lever 41 with a smaller projection height will begin to contact with the slider seat 1 and drive it. This cleverly realizes the precise timing control of the inner slider 2 action (arc-shaped core pulling) and the overall action of the slider seat 1 (final demolding).

[0050] Optionally, in this embodiment, the first slide rail 11 is provided with a second limiting glass bead 341, and a limiting groove 342 extending along the length direction of the inner slide rail 2 is machined at the corresponding position on the bottom surface of the inner slide rail 2; the length of the limiting groove 342 is equal to the sliding distance required for the second lever 42 to drive the inner slide rail 2 to complete the arc-shaped core pulling; the cooperation between the second limiting glass bead 341 and the limiting groove 342 restricts the movement stroke of the inner slide rail 2 in the arc-shaped core pulling stage, which not only ensures that the arc-shaped core 33 can be completely removed from the undercut, but also prevents the inner slide rail 2 from rigidly colliding with the slide rail seat 1, thus playing a protective role.

[0051] Optionally, in this embodiment, the tail of the arc-shaped core 33 is machined with a first connecting hole 37, and the end of the connecting rod 32 is machined with a second connecting hole 38. The rotating shaft 36 passes through the first connecting hole 37 and the second connecting hole 38 in sequence, so that the arc-shaped core 33 can rotate around the axis of the rotating shaft 36, allowing relative rotation between the connecting rod 32 and the arc-shaped core 33, thereby perfectly adapting to the conversion between the linear motion of the connecting rod 32 and the curvilinear motion of the arc-shaped core 33.

[0052] Optionally, in this embodiment, one end of the connecting rod 32 is provided with a T-shaped head 321, and a T-shaped groove 322 that perfectly matches the shape of the T-shaped head 321 is machined on the end face of the inner slider 2. During assembly, the T-shaped head 321 slides into the T-shaped groove 322 from the side. The T-shaped connection method realizes the rigid linkage between the connecting rod 32 and the inner slider 2 in the sliding direction, ensuring the effective transmission of force. At the same time, this structure has an assembly gap in the direction perpendicular to the sliding direction, allowing the connecting rod 32 to have a small swing space during movement to compensate for small errors in the kinematic chain, thereby improving the fault tolerance and smoothness of movement of the mechanism.

[0053] This embodiment describes a method for pulling an arc-shaped undercut core using the mechanism described in any of the above embodiments, including the following steps:

[0054] The mold begins to open, and the front template drives the lever assembly and the shovel 5 to move upward. (Initial core pulling stage) The second lever 42 moves upward, and its inclined section 412 moves the inner slider 2 through the lever hole 21, causing the inner slider 2 to slide backward along the first slide rail 11; the inner slider 2 drives the connecting rod 32 to move backward synchronously in the second slide rail 34 through its T-shaped slot 322; the connecting rod 32 pulls the arc-shaped core 33 through the rotating shaft 36, forcing the arc-shaped core 33 to slide along the arc-shaped track 35 on the slider core seat 31, thereby smoothly separating from the arc-shaped undercut of the product; at the same time, the shovel 5 moves upward, and its lower end face separates from the upper end face of the slider seat 1, releasing the locking of the slider seat 1. When the second limiting glass bead 341 slides from one end of the limiting groove 342 to the other end, it indicates that the inner slider 2 has reached the end of its stroke and the arc-shaped core pulling is completed; at this time, the second lever 42 is just completely disengaged from the lever hole 21. (Overall demolding stage) The mold opening action continues, the inclined section 412 of the first lever 41 begins to contact the rear end of the slider seat 1, and pushes the slider seat 1 to move backward as a whole; the slider seat 1 drives the entire slider core assembly 3 (including the arc core 33) to detach from the product; (stroke termination) when the slider seat 1 moves to the point where the first limit glass bead 63 is engaged with the second positioning recess 632, it indicates that the slider seat 1 has reached the core pulling completion position and the product is completely ejected; when the product is injected and the mold is closed, the process is reversed, and each component is precisely reset under the action of the shovel 5 and the lever; the logic is clear, the steps are clear, and it is completely driven by the mold opening action. The timing control of first arc core pulling and then overall demolding is automatically realized through the mechanical structure, which can effectively produce precision parts with complex internal arc undercuts.

[0055] The embodiments described above merely illustrate implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A curved undercut core-pulling mechanism for an injection mold, characterized in that, include: A slider seat is disposed in the cavity of an injection mold, and the slider seat is provided with a first slide rail inside; The inner slider is slidably disposed in the first slide rail inside the slider seat, and the inner slider has a toggle hole penetrating its upper and lower end faces in the middle. A slider core assembly, connected to one end of the slider seat, includes a slider core seat, a connecting rod, and an arc-shaped core. The slider core seat has a second slide rail communicating with the first slide rail inside. The end of the second slide rail away from the first slide rail is connected to an arc-shaped track. The connecting rod is slidably disposed in the second slide rail. The arc-shaped core is slidably disposed in the arc-shaped track and is hinged to one end of the connecting rod via a rotating shaft; A lever assembly includes a first lever and a second lever, wherein the first lever is connected to the slider seat and is configured to delay driving the slider seat; The second lever passes through the slider seat and is inserted into the actuation hole of the inner slider to drive the inner slider to slide. A forklift is slidably connected to the end of the slider seat away from the slider core assembly; wherein, the upper ends of both the forklift and the lever assembly are connected to the front template. During the mold opening process, in the initial mold opening stage, as the front template detaches upward, the second lever drives the inner slider to retract within the first slide rail, thereby driving the arc-shaped core to move along the arc-shaped track through the connecting rod, so as to initially pull the core out from the arc-shaped undercut of the product; at the same time, the forklift begins to detach from the slider seat; In the subsequent mold opening stage, the second lever disengages from the actuation hole of the inner slider, and the first lever begins to drive the entire slider seat to retract, completing the final demolding of the product.

2. The arc-shaped undercut core-pulling mechanism inside an injection mold according to claim 1, characterized in that, It also includes a pressure strip, and at least one side of the slider seat is provided with a locking protrusion extending along its length direction. The pressure strip is provided with a limiting groove adapted to the locking protrusion. The pressure strip and the slider seat cooperate with the locking protrusion through the limiting groove. The pressure strip is installed on the mold and provides sliding guidance for the slider seat.

3. The arc-shaped undercut core-pulling mechanism inside an injection mold according to claim 2, characterized in that, A first limiting glass bead is provided between the pressure strip and the slider seat. The first limiting glass bead has a movable protrusion. Two positioning recesses that cooperate with the movable protrusion of the first limiting glass bead are provided at intervals on the side of the slider seat to limit the stroke of the slider seat between the initial position and the core-pulling completion position.

4. The arc-shaped undercut core-pulling mechanism inside an injection mold according to claim 3, characterized in that, The distance between the two positioning recesses is equal to the sliding distance of the slider seat driven by the first lever.

5. The arc-shaped undercut core-pulling mechanism inside an injection mold according to claim 1, characterized in that, Both the first lever and the second lever include a vertical section and an inclined section. The inclined section bends from the end of the vertical section in a direction away from the slider core seat, and the included angle between the two is greater than 90°.

6. The arc-shaped undercut core-pulling mechanism inside an injection mold according to claim 5, characterized in that, The projection height of the inclined segment of the first lever in the mold opening direction is less than the projection height of the inclined segment of the second lever, so that the second lever completes the driving contact between its inclined segment and the corresponding component before the first lever, thereby realizing the delayed driving of the first lever relative to the second lever.

7. The arc-shaped undercut core-pulling mechanism inside an injection mold according to claim 1, characterized in that, The first slide is provided with a second limiting glass bead, and the bottom end of the inner slider is provided with a corresponding limiting groove connected thereto. The length of the limiting groove is equal to the sliding distance of the inner slider driven by the second lever.

8. The arc-shaped undercut core-pulling mechanism inside an injection mold according to claim 1, characterized in that, The arc-shaped core is provided with a first connecting hole, and the end of the connecting rod is provided with a second connecting hole. The rotating shaft is inserted into the first connecting hole and the second connecting hole so that the arc-shaped core can rotate around the axis of the rotating shaft.

9. The arc-shaped undercut core-pulling mechanism inside an injection mold according to claim 1, characterized in that, One end of the connecting rod is provided with a T-shaped head, and the inner slider is provided with a T-shaped slot that matches the T-shaped head.

10. A method for pulling a core with an arc-shaped inverted design, employing the core-pulling mechanism as described in any one of claims 1-9, characterized in that, Includes the following steps: The mold opens, and the lever assembly moves upward; the second lever moves upward, causing the inner slider connected to it to retract in the first slide rail, which in turn drives the connecting rod to slide in the second slide rail; the connecting rod drives the arc-shaped core rotatably connected to it to retract along the arc track, so that the arc-shaped core begins to retract and disengage from the arc-shaped undercut of the product; at the same time, the shovel begins to disengage from the slider seat. Once the arc-shaped core has disengaged, the lever assembly continues its upward movement; the second lever disengages from the actuation hole, and the first lever, relative to the second lever and its corresponding component, is driven with a delay. The first lever begins to drive the entire slider seat backward. The setting of the first limiting glass bead and the two sets of positioning recesses limits the stroke of the slider seat between the initial position and the core-pulling completion position, so that when the slider seat reaches the core-pulling completion position, the slider core assembly completes the overall disengagement from the product, completing the final demolding of the product.

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