Ejection structure of a mold pin

Abstract

The application relates to the technical field of molds, and discloses a mold ejector structure of a mold ejector, which comprises a fixed mold base, a movable mold base, a first mold body, a second mold body, an ejector base, a traction frame and a plurality of material-ejecting ejectors; the fixed mold base is arranged opposite to the movable mold base; the traction frame is arranged between the fixed mold base and the ejector base; one end of each material-ejecting ejector is fixedly arranged on the ejector base; the material-ejecting ejector further comprises a material-guiding ejector, one end of which is fixedly arranged on the ejector base, and the other end of which penetrates through and is slidingly arranged in the second mold body; the installation height of the material-guiding ejector in the vertical direction is not lower than that of any material-ejecting ejector, and the end of the material-guiding ejector can be inclined downward after extending into the mold cavity; the material-guiding ejector with the inclined front end is arranged, and the installation position of the material-guiding ejector is limited, so that the workpiece can be prevented from being hung on the material-ejecting ejector after being separated from the mold cavity, and the automation degree of the injection molding production line and the machining efficiency of the workpiece are improved.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to an ejection structure for a mold ejector pin. Background Technology

[0002] The ejection structure of a mold ejector pin is a key component in the injection molding process, and its performance directly determines production efficiency, product quality, and automation level. Existing ejection structures typically include a fixed mold base, a moving mold base, a mold body, an ejector pin holder, and ejector pins fixed to the ejector pin holder. During the mold closing and injection stage, the moving mold base drives the mold body to close with the fixed mold side to form the mold cavity. During the mold opening and demolding stage, a linear displacement module drives the moving mold base backward, while simultaneously, through a traction frame and other linkage mechanisms, it drives the ejector pin holder forward, using the ejector pins to eject the molded workpiece from the mold cavity.

[0003] However, in actual production applications, especially for box-shaped workpieces, after the ejector pin removes the workpiece from the mold cavity, the workpiece tends to hang on the front end of the ejector pin and cannot be automatically detached. This hanging phenomenon necessitates manual intervention to remove the workpiece or the addition of an auxiliary part removal device. This not only significantly reduces the automation level and production cycle stability of the injection molding production line, but also increases the labor intensity of operators and the risks to safe operation. Summary of the Invention

[0004] In view of this, the present invention proposes an ejection structure for mold ejector pins, which can prevent the workpiece from hanging on the ejector pin after leaving the mold cavity, thereby improving the automation level of the injection molding production line and the processing efficiency of the workpiece.

[0005] The technical solution of this invention is implemented as follows: This invention provides an ejection structure for a mold ejector pin, including a fixed mold base, a movable mold base, a first mold body, a second mold body, an ejector pin seat, a traction frame, and a plurality of ejector pins; the fixed mold base and the movable mold base are arranged opposite to each other, and the distance between them is adjustable; the first mold body is fixedly arranged on the fixed mold base; the second mold body is fixedly arranged on the movable mold base and forms a mold cavity with the first mold body; the ejector pin seat is slidably arranged on the movable mold base; the traction frame is arranged between the fixed mold base and the ejector pin seat; one end of the ejector pin is fixedly arranged on the ejector pin seat, and the other end passes through and is slidably arranged in the second mold body; it also includes a guide ejector pin, one end of which is fixedly arranged on the ejector pin seat, and the other end passes through and is slidably arranged in the second mold body, the installation height of the guide ejector pin in the vertical direction is not lower than any of the ejector pins, and the end of the guide ejector pin can tilt downward after extending into the mold cavity.

[0006] Based on the above technical solutions, preferably, the guide pin includes a main rod, a rotating block, and an inclined rod; one end of the main rod is fixedly mounted on the pin seat, and the bottom side of the other end is provided with an installation groove; the rotating block is rotatably mounted in the installation groove; the inclined rod is fixedly mounted on the rotating block and can be coaxially mounted with the main rod.

[0007] Based on the above technical solutions, preferably, the rotating block is provided with a supporting surface, and when the supporting surface abuts against the top wall of the mounting groove, the axis of the tilting rod forms an angle of 30° to 45° with the axis of the main rod.

[0008] Based on the above technical solution, preferably, two guide pins are provided, and the two guide pins are symmetrically arranged about the center line of the mold cavity.

[0009] Based on the above technical solutions, preferably, the vertical installation height of some of the ejector pins is the same as that of the guide pins.

[0010] Based on the above technical solutions, preferably, the ejector seat includes a first ejector seat and a second ejector seat; the first ejector seat is slidably disposed on the moving mold base and fixedly connected to the ejector pin; the second ejector seat is slidably disposed on the moving mold base and located on the side of the first ejector seat away from the mold cavity; and the second ejector seat is fixedly connected to the guide ejector pin.

[0011] Based on the above technical solutions, preferably, the traction frame includes a first fixed seat, a second fixed seat, a third fixed seat, a slide rod, two bosses, and a spring; the first fixed seat is fixedly mounted on the fixed mold base; the second fixed seat is fixedly mounted on the first pin seat and can abut against the first fixed seat; the third fixed seat is fixedly mounted on the second pin seat; the slide rod is slidably mounted between the first fixed seat, the second fixed seat, and the third fixed seat; the two bosses are respectively fixedly mounted at both ends of the slide rod and are respectively used to abut against the first fixed seat and the third fixed seat; the spring is abutted between the second fixed seat and the third fixed seat.

[0012] Based on the above technical solutions, preferably, when the end of the ejector pin is flush with the inner wall of the mold cavity, there is a gap between the guide pin and the mold cavity.

[0013] Based on the above technical solutions, preferably, two traction frames are provided and are arranged opposite to each other on both sides of the fixed mold base.

[0014] Based on the above technical solutions, preferably, the guide pin and the pin seat are fixedly connected in a rotatable manner.

[0015] The ejection structure of the mold ejector pin of the present invention has the following advantages over the prior art: (1) By setting a guide pin that can tilt downwards at the front end and restricting the installation position of the guide pin, the workpiece can be prevented from hanging on the ejector pin after leaving the mold cavity, thereby improving the automation level of the injection molding production line and the processing efficiency of the workpiece.

[0016] (2) By setting the ejector pin seat as the first pin seat and the second pin seat, and making the installation height of the guide pin in the vertical direction the same as that of some ejector pins, not only can the falling efficiency of the workpiece be further improved, but also the load on the guide pin can be reduced and the service life of the device can be extended. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the ejection structure of a mold ejector pin according to the present invention.

[0019] Figure 2 This is a perspective view of the fixed mold base in the ejection structure of a mold ejector pin according to the present invention.

[0020] Figure 3 This is a cross-sectional view of the second mold body in the ejection structure of a mold ejector pin according to the present invention.

[0021] Figure 4 This is a perspective view of the second mold body in the ejection structure of a mold ejector pin according to the present invention.

[0022] Figure 5 This is a perspective view of the ejector seat in the ejection structure of a mold ejector pin according to the present invention.

[0023] Figure 6 This is a perspective view of the material guide pin in the ejection structure of a mold ejector pin according to the present invention.

[0024] Figure 7 This is a cross-sectional view of the guide pin in the ejection structure of a mold ejector pin according to the present invention, showing the state in which the end of the guide pin is not tilted.

[0025] Figure 8 This is a cross-sectional view of the guide pin in the ejection structure of a mold ejector pin according to the present invention, showing the downward inclined state of the end of the guide pin.

[0026] Figure 9This is a front view of the ejection structure of a mold ejector pin according to the present invention during the mold closing process.

[0027] Figure 10 This is a front view of the ejection structure of a mold ejector pin according to the present invention after the mold is closed.

[0028] Figure 11 This is a cross-sectional view of the guide ejector pin in the ejection structure of a mold ejector pin according to the present invention, showing the state in which the second pin seat abuts against the moving mold seat.

[0029] Figure 12 This is a cross-sectional view of the guide ejector pin in the ejection structure of a mold ejector pin according to the present invention, showing that the ends of the guide ejector pin and the ejector pin are flush with the inner wall of the mold cavity.

[0030] The components are: 1. Fixed mold base; 2. Moving mold base; 3. First mold body; 301. Mold cavity; 4. Second mold body; 5. Ejector pin seat; 51. First pin seat; 52. Second pin seat; 6. Traction frame; 61. First fixed seat; 62. Second fixed seat; 63. Third fixed seat; 64. Sliding rod; 65. Boss; 66. Spring; 7. Ejector pin; 8. Guide pin; 81. Main rod; 82. Rotating block; 83. Inclined rod; 801. Mounting groove; 802. Supporting surface. Detailed Implementation

[0031] The technical solutions of this invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] The present invention provides an ejection structure for a mold ejector pin, comprising a fixed mold base 1, a moving mold base 2, a first mold body 3, a second mold body 4, an ejector pin base 5, a traction frame 6, a plurality of ejector pins 7 and guide pins 8.

[0033] The fixed mold base 1 is fixedly installed at the rear end of the injection molding machine, serving as the static reference for the mold system; the moving mold base 2 is positioned opposite to the fixed mold base 1 and connected to the output end of the linear displacement module. For example... Figures 1 to 3As shown, the first mold body 3 is fixedly mounted on the fixed mold base 1 on the side near the moving mold base 2, and is connected to the injection port through the internal flow channel of the fixed mold base 1 to ensure smooth melt flow; the second mold body 4 is fixedly mounted on the moving mold base 2 on the side near the fixed mold base 1; during the mold closing stage, the linear displacement module drives the moving mold base 2 to approach the fixed mold base 1, causing the second mold body 4 to fit tightly with the first mold body 3, forming a sealed mold cavity 301, thereby injecting the injection material into the mold cavity 301 under high pressure from the injection port to form an injection molded workpiece; after the injection is completed and fully cooled and solidified, the linear displacement module drives the moving mold base 2 away from the fixed mold base 1, causing the second mold body 4 to separate from the first mold body 3, completing the mold opening action, so that the workpiece can be removed.

[0034] Ejector seat 5 is slidably mounted on moving mold base 2, and traction frame 6 is mounted between fixed mold base 1 and ejector seat 5, forming a linkage mechanism; one end of ejector pin 7 is fixedly mounted on ejector seat 5, and the other end passes through and slides between moving mold base 2 and second mold body 4. Figure 3 and Figure 4 As shown, during the mold opening stroke, the traction frame 6 limits the ejector seat 5, driving the front end of the ejector pin 7 to extend into the mold cavity 301, and using mechanical thrust to push the molded workpiece away from the mold cavity 301, thereby realizing automated demolding operation.

[0035] Two traction frames 6 are preferably provided and arranged opposite each other on both sides of the fixed mold base 1 to form a double-point spatial constraint layout. This arrangement can effectively suppress adverse phenomena such as ejector pin seat 5 swaying, ejector pin tilting and jamming, or mold body misalignment caused by uneven force on one side during mold opening and closing. It significantly improves the coaxiality, synchronization and torsional stiffness of the traction action, thereby ensuring the consistency of the ejector pin movement trajectory and the repeatability accuracy of the demolding posture. It is especially suitable for application scenarios with strict requirements for positioning stability.

[0036] To enhance the precise alignment and long-term operational reliability of the first mold body 3 and the second mold body 4 in the mold-closed state, a high-precision guiding structure is preferably integrated on the fixed mold base 1 and the moving mold base 2, such as a combination of paired cylindrical guide pillars and guide sleeves. This guiding structure achieves pre-positioning of the mold body in the early stage of mold closing, and bears lateral forces and off-center loads during the high-pressure injection stage, significantly reducing the risk of mold core misalignment and improving the sealing integrity of the mold cavity 301 and the dimensional stability of the product.

[0037] like Figure 3 As shown, when machining box-shaped workpieces (such as thin-walled shells with sidewalls, shallow cavities, or openings facing the ejector pins), the workpiece ejected from the mold cavity 301 is prone to hanging on the front end of the ejector pin 7, making it difficult to detach automatically. Manual intervention or additional auxiliary devices are required for removal, reducing the level of automation, affecting cycle stability, and increasing operational risks. Meanwhile, as Figure 1As shown, the traction frame 6 spans between the fixed mold base 1 and the moving mold base 2. Its compact spatial layout and proximity to the mold cavity 301 exit area further restrict the operating space for manual or auxiliary devices to approach the workpiece, exacerbating the difficulty of removing the workpiece.

[0038] To overcome the aforementioned technical bottlenecks, this device adds a guide ejector pin 8, forming an integrated demolding structure of "ejection-guiding-sliding". Specifically, one end of the guide ejector pin 8 is fixedly mounted on the ejector pin seat 5, and the other end passes through the moving mold seat 2 and the second mold body 4, and is slidably connected with the moving mold seat 2 and the second mold body 4; the front end of the guide ejector pin 8 can tilt downward when it extends into the mold cavity 301.

[0039] In some embodiments, the vertical installation height of the guide ejector pin 8 is higher than that of all the ejector pins 7. During the mold opening stage, the guide ejector pin 8 contacts the sidewall of the workpiece first. The sidewall of the box-shaped workpiece will not be suspended on the front end of the ejector pin 7, but will slide downward along the inclined side of the front end of the guide ejector pin 8 and fall into the conveyor belt, receiving tray, or buffer groove below the mold cavity 301. This design not only avoids the problem of workpiece suspension, but also achieves contactless and intervention-free autonomous demolding, significantly improving the automation rate, operational safety, and process consistency of the injection molding production line, and is especially suitable for high-volume, high-cycle box-shaped workpieces.

[0040] like Figure 6 and Figure 8 As shown, in a preferred embodiment, the guide pin 8 includes a main rod 81, a rotating block 82, and an inclined rod 83; one end of the main rod 81 is preferably fixed to the pin seat 5 by bolts or other fasteners, and the bottom side of the other end is provided with a mounting groove 801; the rotating block 82 is rotatably disposed within the mounting groove 801; one end of the inclined rod 83 is fixedly disposed on the rotating block 82. Figure 7 As shown, during the mold closing stage or the incomplete mold opening stage, the rotating block 82 is completely located in the guide hole within the second mold body 4. At this time, the tilting rod 83 is constrained by the hole wall of the second mold body 4 and remains coaxial with the main rod 81, ensuring that the guide ejector pin 8 does not interfere with the second mold body 4 and the injection molded workpiece during mold closing. During the mold opening stage, the ejector seat 5 moves forward relative to the second mold body 4, and the rotating block 82 gradually leaves the limiting area of ​​the second mold body 4 and enters the mold cavity 301. At this time, the tilting rod 83 drives the rotating block 82 to rotate together under its own gravity, thereby causing the front end of the guide ejector pin 8 to form a downward tilting posture. During the mold closing stage, the ejector seat 5 moves backward relative to the second mold body 4, and the second mold body 4 pushes the rotating block 82 and the tilting rod 83 to rotate and reset, making the tilting rod 83 coaxial with the main rod 81.

[0041] like Figure 8As shown, the rotating block 82 is provided with a supporting surface 802. When the supporting surface 802 abuts against the top wall of the mounting groove 801, the preset maximum tilt angle limit position is reached. At this time, the axis of the tilting rod 83 forms an angle of 30° to 45° with the axis of the main rod 81. This angle can maximize the downward driving force and trajectory stability without causing the workpiece to jam, thereby improving the demolding reliability and path consistency. It is especially suitable for box-shaped workpieces with different wall thicknesses, materials and geometric complexities.

[0042] like Figure 6 As shown, the guide pin 8 is a cylindrical structure. After loosening the fastener between the guide pin 8 and the pin seat 5, the main rod 81 can rotate around its own axis in the mounting hole of the pin seat 5, thereby changing the tilt position of the tilting rod 83 as a whole, so that the workpiece slides down in different directions to meet the production needs of multi-cavity molds, irregular layouts or conveyor line offsets.

[0043] To improve on-site adjustment efficiency and accuracy, a visual marking structure (such as...) is preferably set at the end of the guide pin 8. Figure 6 The notch at the lower right end of the main rod 81 (as shown) allows operators to quickly align the target downward direction based on the mold layout, significantly reducing debugging time.

[0044] In other embodiments, the vertical mounting height of the guide ejector pin 8 can be consistent with the vertical mounting height of some of the ejector pins 7. The guide ejector pin 8 also includes a main rod 81, a rotating block 82, and a tilting rod 83. In the initial stage of mold opening, such as... Figure 7 As shown, under the synchronous limiting action of the traction frame 6, the guide pin 8 and the ejector pin 7 slide into the mold cavity 301 with the same stroke, pushing the box-shaped workpiece away from the mold cavity 301 as a whole; subsequently, the ejector pin 7 remains stationary relative to the second mold body 4, while the guide pin 8 extends forward relative to the second mold body 4 by a certain stroke, pushing the workpiece forward relative to the second mold body 4 and completely disengaging it from the support area of ​​the ejector pin 7; finally, as shown... Figure 8 As shown, when the front end of the guide pin 8 enters the mold cavity 301, it triggers a tilting mechanism, causing the tilting rod 83 to rotate and form an inclined surface. The workpiece then slides smoothly down along this inclined surface. This design avoids the guide pin 8 independently supporting the top position of the workpiece, reduces the instantaneous load and bending stress borne by the guide pin 8, reduces the risk of pin breakage, effectively improves its long-term operational stability, and extends its service life.

[0045] like Figure 4 As shown, in order to balance the load distribution and enhance the guiding reliability, the guide pins 8 are preferably set to two, and the two guide pins 8 are symmetrically arranged about the center line of the mold cavity 301. The two guide pins 8 are located between the array of multiple ejector pins 7, which not only ensures effective support and synchronous guidance for box-shaped workpieces, but also greatly distributes the support burden of the guide pins 8, further improving the symmetry and repeatability of the demolding action.

[0046] As a preferred embodiment, such as Figure 1 , Figure 5 , Figure 9 and Figure 10 As shown, the ejector seat 5 includes a first ejector seat 51 and a second ejector seat 52, and the traction frame 6 includes a first fixed seat 61, a second fixed seat 62, a third fixed seat 63, a slide rod 64, two bosses 65, and a spring 66; the first ejector seat 51 is slidably disposed on the moving mold base 2 and is fixedly connected to the rear end of the ejector pin 7; the second ejector seat 52 is also slidably disposed on the moving mold base 2 and is located on the side of the first ejector seat 51 away from the mold cavity 301. The second ejector seat 52 is fixedly connected to the rear end of the guide ejector pin 8, and the guide ejector pin 8 passes through and is slidably disposed within the first ejector seat 51; the first The fixed seat 61 is fixedly mounted on the fixed mold base 1, the second fixed seat 62 is fixedly mounted on the first needle seat 51, and the third fixed seat 63 is fixedly mounted on the second needle seat 52; the slide rod 64 is slidably mounted between the first fixed seat 61, the second fixed seat 62 and the third fixed seat 63; two bosses 65 are respectively fixedly mounted at both ends of the slide rod 64, the first fixed seat 61, the second fixed seat 62 and the third fixed seat 63 are located between the two bosses 65 in sequence, and the spring 66 is abutted between the second fixed seat 62 and the third fixed seat 63 and sleeved on the slide rod 64.

[0047] During the mold opening stage, when the moving mold base 2 begins to retract, the front side of the first fixed base 61 abuts against the boss 65 at the front end of the slide rod 64, limiting the slide rod 64. This causes the boss 65 at the rear end of the slide rod 64 to abut against the rear side of the third fixed base 63. At this time, the second pin seat 52 is simultaneously pulled along with the first pin seat 51, moving forward relative to the second mold body 4. The ejector pin 7 and the guide pin 8 extend into the mold cavity 301 to complete the initial ejection. When the front end of the first pin seat 51 abuts against the moving mold base 2 and stops moving, the moving mold base 2 pushes the first pin seat 51 and the ejector pin 7 to retract simultaneously. The boss 65 at the rear end of the slide rod 64 abuts against the rear end face of the third fixed base 63, causing the spring 66 to contract. The second pin seat 52 moves forward relative to the second mold body 4, allowing the guide pin 8 to extend independently, causing the workpiece to detach from the support area of ​​the ejector pin 7. Subsequently, the rotating block 82 extends into the mold cavity 301, and the tilting rod 83 tilts downwards, causing the workpiece to slide down smoothly. Figure 8 As shown, in the final state of mold opening, the front end of the main rod 81 is flush with the front end of the ejector pin 7, that is, the inclined guide surface on the guide pin 8 is located in front of the ejector pin 7. When the guide pin 8 pushes the workpiece away from the ejector pin 7, it ensures that the workpiece slides down along the inclined guide surface on the guide pin 8.

[0048] During the mold closing stage, as the moving mold base 2 returns to its original position, the spring 66 releases its elastic potential energy, and the first pin seat 51 and the ejector pin 7 move forward with the moving mold base 2, thereby driving the guide pin 8 to retract a certain distance within the mold cavity 301. Subsequently, the rear side of the first fixed seat 61 fits against the front side of the second fixed seat 62, pulling the second fixed seat 62 and the third fixed seat 63 to retract synchronously relative to the second mold body 4 until the rear side of the second pin seat 52 presses against the rear limit surface of the moving mold base 2, completing the complete reset of the guide pin 8 and the ejector pin 7, ensuring mold closing accuracy and sealing reliability.

[0049] To balance the structural reliability of the guide pin 8 with the functional integrity of the mold, this design further optimizes its dimensional configuration. Given that the guide pin 8 consists of multiple components such as the main rod 81, rotating block 82, and tilting rod 83, its overall rigidity is weaker than that of the single-unit ejector pin 7. Under repeated cyclic loads, it is prone to reduced lifespan due to cantilever bending, wear of rotating parts, or fretting fatigue. Therefore, it is preferable to reasonably reduce its overall length; that is, while ensuring the effective implementation of the tilting guiding function, the front end of the guide pin 8 is designed to be 1mm–3mm shorter than the corresponding position of the ejector pin 7.

[0050] Specifically, when the end of the ejector pin 7 is flush with the inner wall of the mold cavity 301, the front end of the guide pin 8 is spaced 1mm-3mm from the inner wall of the mold cavity 301. Figure 11 As shown, when the front end of the guide pin 8 is flush with the inner wall of the mold cavity 301, the length of the front end of the ejector pin 7 extending into the mold cavity 301 is 1mm-3mm. Figure 7 As shown, when machining geometrically flat workpieces, when the guide pin 8 and the ejector pin 7 extend synchronously toward the mold cavity 301, the front end of the guide pin 8 is located behind the front end of the ejector pin 7, so that the workpiece is completely pushed away from the mold cavity 301 by the ejector pin 7.

[0051] It should be noted that this length difference scheme is a preferred adaptation strategy for high durability and medium-to-low precision working conditions, suitable for the automated production of mass-produced, general-purpose box-shaped workpieces. For precision injection molded parts with extremely high requirements for surface finish, dimensional tolerances, or contour accuracy, this length difference design can be eliminated, and the guide ejector pin 8 and ejector pin 7 can be arranged with equal lengths, such as... Figure 12 As shown, after the mold is closed, the ends of the ejector pin 7 and the guide pin 8 are flush with the inner wall of the mold cavity 301.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ejection structure for a mold ejector pin, comprising a fixed mold base (1), a movable mold base (2), a first mold body (3), a second mold body (4), an ejector pin seat (5), a traction frame (6), and a plurality of ejector pins (7); the fixed mold base (1) and the movable mold base (2) are arranged opposite to each other, and the distance between them is adjustable; the first mold body (3) is fixedly arranged on the fixed mold base (1); the second mold body (4) is fixedly arranged on the movable mold base (2) and surrounds the first mold body (3) to form a mold cavity (301); the ejector pin seat (5) is slidably arranged on the movable mold base (2); the traction frame (6) is arranged between the fixed mold base (1) and the ejector pin seat (5); one end of the ejector pin (7) is fixedly arranged on the ejector pin seat (5), and the other end passes through and is slidably arranged in the second mold body (4); Its features are: It also includes a guide pin (8), one end of which is fixedly mounted on the pin seat (5), and the other end is slidably mounted inside the second mold body (4). The vertical installation height of the guide pin (8) is not lower than any of the ejector pins (7), and the end of the guide pin (8) can tilt downward after extending into the mold cavity (301).

2. The ejection structure of a mold ejector pin as described in claim 1, characterized in that: The guide pin (8) includes a main rod (81), a rotating block (82) and an inclined rod (83); one end of the main rod (81) is fixedly mounted on the pin seat (5), and the bottom side of the other end is provided with an installation groove (801); the rotating block (82) is rotatably mounted in the installation groove (801); the inclined rod (83) is fixedly mounted on the rotating block (82) and can be coaxially mounted with the main rod (81).

3. The ejection structure of a mold ejector pin as described in claim 2, characterized in that: The rotating block (82) is provided with a supporting surface (802). When the supporting surface (802) abuts against the top wall of the mounting groove (801), the axis of the tilting rod (83) forms an angle of 30° to 45° with the axis of the main rod (81).

4. The ejection structure of a mold ejector pin as described in claim 1, characterized in that: There are two guide pins (8), and the two guide pins (8) are symmetrically arranged about the center line of the mold cavity (301).

5. The ejection structure of a mold ejector pin as described in claim 4, characterized in that: The installation height of the top ejector pin (7) in the vertical direction is the same as that of the guide ejector pin (8).

6. The ejection structure of a mold ejector pin as described in claim 1, characterized in that: The ejector pin seat (5) includes a first pin seat (51) and a second pin seat (52); the first pin seat (51) is slidably disposed on the moving mold seat (2) and fixedly connected to the ejector pin (7); the second pin seat (52) is slidably disposed on the moving mold seat (2) and located on the side of the first pin seat (51) away from the mold cavity (301); and the second pin seat (52) is fixedly connected to the guide pin (8).

7. The ejection structure of a mold ejector pin as described in claim 6, characterized in that: The traction frame (6) includes a first fixed seat (61), a second fixed seat (62), a third fixed seat (63), a slide rod (64), two bosses (65), and a spring (66); the first fixed seat (61) is fixedly mounted on the fixed mold base (1); the second fixed seat (62) is fixedly mounted on the first needle seat (51) and can abut against the first fixed seat (61); the third fixed seat (63) is fixedly mounted on the second needle seat (52); the slide rod (64) is slidably mounted between the first fixed seat (61), the second fixed seat (62), and the third fixed seat (63); the two bosses (65) are respectively fixedly mounted at both ends of the slide rod (64) and are respectively used to abut against the first fixed seat (61) and the third fixed seat (63); the spring (66) abuts against the second fixed seat (62) and the third fixed seat (63).

8. The ejection structure of a mold ejector pin as described in claim 7, characterized in that: When the end of the ejector pin (7) is flush with the inner wall of the mold cavity (301), there is a gap between the guide pin (8) and the mold cavity (301).

9. The ejection structure of a mold ejector pin as described in claim 8, characterized in that: Two traction frames (6) are provided and are arranged opposite each other on both sides of the fixed mold base (1).

10. The ejection structure of a mold ejector pin as described in claim 1, characterized in that: The feed guide pin (8) and the pin seat (5) are fixedly connected in a rotatable manner.

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