An injection mold for automotive parts with a rapid injection molding structure

Abstract

This invention relates to the technical field of injection molds and discloses an injection mold for automotive parts with a rapid injection structure. The mold includes a guide rod, a fixed mold clipped to the outside of the guide rod, a moving mold slidably connected to the outside of the guide rod, and a housing disposed outside the moving mold. A limiting member is initially located inside a blocking unit and in contact with it. When the limiting member is in a set position, it is in contact with a baffle plate. When the ejector moves, it moves intermittently and with gradually increasing distances through the blocking unit, finally achieving long-distance movement through the baffle plate. By using the thickness difference between the first and second blocks to create short and medium stroke pre-processing, and finally achieving long-distance ejection with the rigid support of the baffle plate, and by synchronously and uniformly moving the limiting rod and the ejector, the invention effectively solves the problem of warping and deformation caused by uneven force during demolding of complex curved surfaces and soft material parts. This significantly reduces the scrap rate due to warping and cracking, reduces ineffective losses from rework and replenishment, and increases the proportion of effective output.

Description

Technical Field

[0001] This invention relates to the technical field of injection molds, and more particularly to an injection mold for automotive parts with a rapid injection structure. Background Technology

[0002] Injection molding is a core process and equipment for the mass production of injection-molded automotive parts. It is widely used in the manufacturing of interior parts, exterior parts, and functional parts. Essentially, it is a cavity tool designed based on the three-dimensional shape of the automotive parts. The mold is divided into a moving mold and a fixed mold, while the equipment consists of core components such as a gating system, a cooling system, a demolding system, and a guiding and positioning system. It replicates molten plastic into a solid part that is consistent with the cavity.

[0003] However, in existing technologies, there are generally three demolding methods. The first is air blowing demolding, which is relatively low-cost. Compressed air is introduced into the mold through pre-reserved air channels or exhaust grooves to form an air cushion between the part and the mold surface. The air pressure blows the part away from the cavity. The structure only requires air channels and an air compressor. However, automotive parts are mostly complex curved surfaces and thin-walled structures, and high-pressure airflow is difficult to apply evenly. Excessive local air pressure can easily cause the part to warp and deform at the edges, affecting subsequent assembly and increasing process costs. Its application range is extremely narrow, and it can only be used for small parts with simple structures, high rigidity, and small contact areas. The second method is mechanical gripping demolding. An industrial robot is used with a customized fixture, which is linked with the mold opening action of the injection molding machine to accurately grasp the part and remove it from the mold to place it in a conveyor belt or hopper. However, its drawbacks are mainly in terms of cost and maintenance. Moreover, automotive parts are mostly irregularly shaped structures, and the fixtures need to be custom-designed. Curved surfaces, grooves, or soft materials are prone to problems such as not being clamped securely and falling off or damaging the surface. The need to reserve space for robotic arm operation leads to increased mold size, extended injection molding machine opening stroke, and reduced production efficiency. The last method, combining ejector pin ejection and manual removal, is currently the most widely used general solution. Multiple steel ejector pins are installed inside the mold, one end connected to the ejector plate, and the other end aligned with the preset ejection point in the cavity. After mold opening, the injection molding machine's ejection mechanism pushes the ejector plate, and the ejector pins extend to lift the part, which is then picked up manually. There are usually two ways to move the ejector pins: one is to use a baffle plate to prevent the ejector plate from moving, while the moving mold continuously moves the injection part, thus pushing the ejector pins against the injection part; the other is to directly push the ejector plate with a cylinder. However, both methods involve pushing a single distance without pre-loosening the injection part, and the point contact between the ejector pin and the part can easily lead to local pressure concentration on the injection part, causing cracks to occur when the ejector pins push out areas with uneven wall thickness, corners, or areas stuck to the mold. Summary of the Invention

[0004] The purpose of this invention is to provide an injection mold for automotive parts with a rapid injection molding structure, thereby solving the problem of the inability to quickly and effectively demold injection molded parts.

[0005] The technical solution of the present invention is as follows: an injection mold for automotive parts with a rapid injection structure, including a guide rod, a fixed mold clamped to the outside of the guide rod, a moving mold slidably connected to the outside of the guide rod, a housing disposed outside the moving mold, a baffle plate fixedly connected to the guide rod, an ejector pin slidably connected to the moving mold, two rotating pins rotatably connected to the ejector pins, two blocking units slidably connected to the guide rod, two blocking units slidably connected to the housing, and a connecting frame fixedly connected to the ejector pins. The two rotating pins, the limiting units, and the blocking units are all symmetrical about the central axis of the moving mold. The two limiting units are all connected to the connecting frame. The limiting units include an initial position and a set position. When the limiting unit is in the initial position, it is located inside the blocking unit and the two are in contact. When the limiting unit is in the set position, it is in contact with the baffle plate. When the ejector pins move, they move intermittently and gradually in increasing distance through the blocking units, and finally move a long distance through the baffle plate.

[0006] Furthermore, the interior of the outer casing is provided with multiple guide blocks, and the blocking unit is slidably connected inside the guide blocks. The blocking unit is divided into a secondary block and a primary block. The secondary block is located between the primary block and the blocking plate. Both the secondary block and the primary block are connected to the outer casing with return springs.

[0007] Furthermore, the limiting component includes a connecting plate slidably connected to the guide rod, a limiting rod fixedly connected to the connecting plate, and both the secondary block and the primary block have through holes, the diameter of which is equal to the diameter of the limiting rod.

[0008] Furthermore, both the secondary block and the primary block are configured with a double-sided arc shape on the side closest to the ejector pin, and the thickness of the secondary block is greater than that of the primary block.

[0009] Furthermore, the horizontal axes of the rotating needle component and the moving mold coincide. The rotating needle component includes a needle tube rotatably connected to the ejector pin, and a torsion spring connected between the needle tube and the ejector pin. The needle tube has a guide groove and the interior of the needle tube is hollow.

[0010] Furthermore, a linkage spring is connected between the connecting frame and the connecting plate, a pressure block is fixedly connected to the ejector pin, the two ends of the pressure block are set to double-sided arc shape, and a through hole is opened on the connecting frame.

[0011] Furthermore, two blocking sleeves and an inner rod are fixedly connected to the blocking plate, and a convex shaft is fixedly connected to the inner rod. The diameter of the inner rod is equal to the inner diameter of the needle tube.

[0012] Furthermore, the diameter of the convex shaft is equal to the width of the guide groove, the resist sleeve is concentric with the through hole, and a circular hole is provided on the resist plate.

[0013] Furthermore, a return spring is connected between the ejector pin and the moving mold, and the spring force coefficient of the return spring is greater than that of the return spring.

[0014] Furthermore, when the connecting plate is in the initial position, the distance between the side of the limiting rod away from the connecting plate and the side of the pressure block is less than the thickness of the secondary block, and the side of the limiting rod is located between the pressure block and the secondary block.

[0015] The beneficial effects of this invention are:

[0016] By utilizing the thickness difference between the first and second blocks to create short- and medium-stroke pre-processing, and finally achieving long-distance ejection with the rigid support of the baffle plate, the synchronous and uniform movement of the limiting rod and the ejector pin enhances the protection of complex curved surfaces and soft injection molded parts, avoiding deformation caused by force offset. In conjunction with the double-sided arc contact of the first and second blocks, the ejection force of the ejector pin is always uniformly transmitted, ensuring that the ejection resultant force is consistent with the center of gravity of the part. At the same time, the rotating pin, limiting part, and baffle unit are all symmetrically designed about the central axis of the moving mold, which can further limit the synchronous movement of the ejector pin on both sides, ensuring synchronous ejection action. This effectively solves the problem of warping and deformation caused by uneven force during demolding of complex curved surfaces and soft material parts, significantly reducing the scrap rate of warping, cracking, etc., reducing the ineffective losses of rework and re-production, and increasing the effective output ratio.

[0017] The connecting frame synchronizes the movement of the ejector pin and the limiting component, avoiding ejection failure caused by misalignment. At the same time, multiple springs generate graded elastic force, which can quickly drive each component to reset after demolding. In addition, the extrusion force generated when the components move evenly is used to form movement, so that different double-sided arcs can cooperate with each other, achieving continuous and efficient production without additional debugging.

[0018] 3. Through the rotating pin component coaxial with the moving mold, the axial thrust of the ejection is converted into circumferential rotational force through the guide groove of the pin tube and the convex shaft of the baffle plate. This force can be applied to the thin-walled part in the middle of the complex curved surface part to achieve local dynamic loosening. With the first and second block staged ejection structure and the rotation assistance of the rotating pin component, the sticking stress is broken in advance and the sticking force is dispersed, avoiding the waiting time of the mold jamming in traditional ejection. Finally, with the help of the baffle plate, a one-time long-distance ejection is achieved, which shortens the demolding time and improves the molding qualification rate. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram from a first perspective of the present invention;

[0020] Figure 2 This is a side view of the moving mold of the present invention;

[0021] Figure 3 For the present invention Figure 2 Sectional view at point AA;

[0022] Figure 4 This is a schematic diagram of the structure of the moving mold of the present invention;

[0023] Figure 5 This is a schematic diagram of the barrier unit of the present invention;

[0024] Figure 6 This is a schematic diagram of the outer casing of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the ejector pin device of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the screw-on component of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of the resist plate of the present invention.

[0028] In the picture:

[0029] 1. Guide rod; 2. Fixed mold; 3. Moving mold; 4. Outer shell; 41. Guide block; 5. Block plate; 51. Block sleeve; 52. Inner rod; 521. Convex shaft; 501. Round hole; 6. Ejector pin; 61. Pressure block; 62. Return spring; 7. Rotating needle component; 71. Needle tube; 711. Guide groove; 72. Torsion spring; 8. Limiting component; 81. Connecting plate; 82. Limiting rod; 9. Blocking unit; 91. Secondary block; 92. First block; 93. Return spring; 901. Through hole; 10. Connecting frame; 101. Linkage spring. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Reference Figures 1-9This invention provides an injection mold for automotive parts with a rapid injection molding structure, including a guide rod 1, a fixed mold 2 snapped onto the outside of the guide rod 1, a moving mold 3 slidably connected to the outside of the guide rod 1, a housing 4 disposed outside the moving mold 3, a baffle plate 5 fixedly connected to the guide rod 1, an ejector pin 6 slidably connected to the moving mold 3, two rotating pins 7 rotatably connected to the ejector pins 6, two blocking units 9 slidably connected to the guide rod 1, and two blocking elements 9 slidably connected to the housing 4. The moving mold 3 has a central axis symmetrical about the central axis of the moving mold 3, and a connecting frame 10 fixedly connected to the ejector pin 6. The two rotating pin parts 7, the limiting parts 8, and the blocking unit 9 are all symmetrical about the central axis of the moving mold 3. The two limiting parts 8 are connected to the connecting frame 10. The limiting parts 8 include an initial position and a set position. When the limiting parts 8 are in the initial position, they are located inside the blocking unit 9 and the two are in contact. When the limiting parts 8 are in the set position, they are in contact with the blocking plate 5. When the ejector pin 6 moves, it moves intermittently and gradually increases in distance through the blocking unit 9, and finally moves a long distance through the blocking plate 5.

[0032] Specifically, the guide rod 1, the outer shell 4, and the baffle plate 5 are fixedly connected to the injection molding machine body in the prior art. The guide rod 1 provides a track and support for the fixed mold 2 and the moving mold 3. The moving mold 3 moves and opens along the guide rod 1. The ejector pin 6 is composed of an ejector pin and a pin plate. One end of the ejector pin is slidably connected to the moving mold 3. In the initial state, the limiting member 8 is attached to the inside of the blocking unit 9. At this time, the blocking unit 9 is restricted by the limiting member 8. When the blocking unit 9 is restricted by the limiting member 8, it will block the ejector pin 6, thereby stopping the ejector pin 6 from moving and pushing the injection molded part. However, when the ejector pin 6 briefly starts to eject, since the limiting member 8 also moves synchronously with the moving mold 3, the blocking unit 9 will lose the limiting effect of the limiting member 8 after a brief blocking of the ejector pin 6. When the blocking unit 9 loses its limiting effect, the moving ejector pin 6 can squeeze the blocking unit 9, causing the blocking unit 9 to move. The ejector pin 6 moves intermittently by continuously engaging and limiting the blocking unit 9. The ejection distance after each engagement gradually increases with the sliding of the blocking unit 9, thus loosening the injection molded part. When the ejector pin 6 moves the limiting member 8 to engage with the blocking plate 5 fixed to the guide rod 1, the limiting effect of all blocking units 9 is released. The blocking plate 5 provides rigid support, triggering the long-distance ejection of the ejector pin 6, achieving complete separation of the injection molded part. This ensures that the ejection force is consistent with the center of gravity of the part, effectively preventing warping and deformation of parts with complex curved surfaces and soft materials. The connecting frame 10 ensures the synchronization of the movement of the ejector pin 6 and the limiting member 8, avoiding ejection failure due to misalignment. Furthermore, as the moving mold 3 opens, the rotating pin 7 engages with the blocking plate 5, causing the ejection force of the rotating pin 7 to rotate. The rotation of the rotating pin 7 further loosens the injection molded part locally.

[0033] Among them, the two rotating pin parts 7, the limiting part 8 and the blocking unit 9 are all symmetrical about the central axis of the moving mold 3, which can synchronously limit the two sides of the ejector pin 6 and ensure that the ejector pin 6 moves synchronously.

[0034] Reference Figures 1-7 The housing 4 has multiple guide blocks 41 inside, and the blocking unit 9 is slidably connected inside the guide blocks 41. The blocking unit 9 is divided into a secondary block 91 and a primary block 92. The secondary block 91 is located between the primary block 92 and the blocking plate 5, forming a linear arrangement to ensure that the ejector pin 6 contacts both of them in sequence during the movement, so as to achieve orderly progression of the stroke. The secondary block 91 and the primary block 92 are both connected to the housing 4 by a return spring 93, which provides the reset power for the secondary block 91 and the primary block 92. The side of the secondary block 91 and the primary block 92 closest to the ejector pin 6 is set as a double-sided arc. The thickness of the secondary block 91 is greater than that of the primary block 92, forming a distance difference between the short stroke and the medium stroke.

[0035] The secondary block 91 and the primary block 92 are combined to form the barrier unit 9, and the ejector pin 6 will contact the primary block 92 and the secondary block 91 in sequence. For longer curved injection molded parts, the barrier structure can be further increased to enhance the loosening effect of the injection molded parts, but the production line needs to be extended.

[0036] The limiting component 8 includes a connecting plate 81 slidably connected to the guide rod 1, a limiting rod 82 fixedly connected to the connecting plate 81, and through holes 901 for both the secondary block 91 and the primary block 92. The diameter of the through holes 901 is equal to the diameter of the limiting rod 82, and the through holes 901 of the two are concentric. When the limiting rod 82 is located in the through hole 901 of the secondary block 91, the secondary block 91 will be fixed. When the connecting plate 81 is in the initial position, the limiting rod 82 passes through the two through holes 901, which will fix the secondary block 91 and the primary block 92 at the same time.

[0037] In this process, the movement of the limiting rod 82 and the ejector pin 6 is the same and they always maintain a constant speed. Therefore, by taking advantage of the difference in thickness between the secondary block 91 and the primary block 92, the limiting time of the limiting rod 82 on the primary block 92 is less than that of the secondary block 91. As a result, the limiting time of the ejector pin 6 is different, and the triggered movement distance is also different, thus enabling the pre-processing of short-stroke loosening and medium-stroke increasing.

[0038] Specifically, when the ejector pin 6 moves at a constant speed with the moving mold 3, the ejector pin 6 will first contact the first block 92. At this time, the limiting rod 82 has not yet left the inside of the first block 92, and the first block 92 cannot move, thus blocking the ejector pin 6. Subsequently, due to the thinness of the first block 92, the moving mold 3 will drive the limiting rod 82 to be pulled out synchronously at a constant speed. The limiting rod 82 will first completely disengage from the through hole 901 of the first block 92, and the first block 92 will lose its limiting constraint. At this time, the ejector pin 6 continues to move and squeeze the double-arc surface of the first block 92. The first block 92 slides along the guide block 41, and the ejector pin 6 obtains the first short-distance ejection space, completing the initial loosening of the injection molded part and breaking the surface sticking stress of the injection molded part.

[0039] When the ejector pin 6 contacts the secondary block 91, because the secondary block 91 is thicker, the limiting rod 82 limits it for a longer time than the primary block 92. After the limiting rod 82 completely disengages from the through hole 901 of the secondary block 91, the secondary block 91 is released from fixation, and the ejector pin 6 immediately transmits the extrusion force to the secondary block 91, driving the secondary block 91 to slide along the guide block 41. Due to the thickness advantage of the secondary block 91, the ejector pin 6 is limited for a longer time in this stage, and the ejection distance obtained is greater than that in the first stage, realizing mid-stroke incremental ejection, further dispersing the sticking force between the injection molded part and the cavity, and making full preparations for subsequent long-distance ejection.

[0040] Reference Figures 2-9 The horizontal axes of the rotating pin 7 and the moving mold 3 coincide, so that the force of the rotating pin 7 acts on the thin-walled part in the middle of the complex curved surface. The rotating pin 7 includes a needle tube 71 rotatably connected to the ejector pin 6, and a torsion spring 72 connected between the needle tube 71 and the ejector pin 6. The needle tube 71 has a guide groove 711 and the inside of the needle tube 71 is hollow. The rotating pin 7 does not rotate when it moves synchronously with the ejector pin 6. Furthermore, the ejector pin 6 does not move when the rotating pin 7 rotates, and the injection molded part is loosened by local rotation.

[0041] A linkage spring 101 is connected between the connecting frame 10 and the connecting plate 81. A pressure block 61 is fixedly connected to the ejector pin 6. The two ends of the pressure block 61 are set to double-sided arc shape. A through hole is opened on the connecting frame 10. A return spring 62 is connected between the ejector pin 6 and the moving mold 3. When the pressure block 61 of the ejector pin 6 is blocked by the blocking unit 9, the ejector pin 6 will compress the return spring 62. When the blocking unit 9 loses its limit, since the elastic coefficient of the return spring 62 is greater than the elastic coefficient of the return spring 93, the return spring 62 will quickly rebound, causing the ejector pin 6 to squeeze the blocking unit 9, and the blocking unit 9 will compress the return spring 93.

[0042] The two ends of the pressure block 61 are set to double-sided arcs, which cooperate with the double-sided arcs set in the secondary block 91 and the primary block 92, so that the reciprocating movement of the pressure block 61 can use the arc surface to squeeze the secondary block 91 and the primary block 92, causing the secondary block 91 and the primary block 92 to move.

[0043] Two sleeves 51 and an inner rod 52 are fixedly connected to the baffle plate 5. A convex shaft 521 is fixedly connected to the inner rod 52. The diameter of the inner rod 52 is equal to the inner diameter of the needle tube 71. The diameter of the convex shaft 521 is equal to the width of the guide groove 711. The sleeves 51 are concentric with the through hole. A circular hole 501 is opened on the baffle plate 5.

[0044] Specifically, the rotating needle component 7 consists of a needle tube 71 and a torsion spring 72. The needle tube 71 is rotatably connected to the ejector pin 6, and the torsion spring 72 connects the two to provide rotational restoring force. The diameter of the inner rod 52 is equal to the inner diameter of the needle tube 71, ensuring that the needle tube 71 can slide smoothly along the inner rod 52 and be coaxial. The convex shaft 521 is fixed to the inner rod 52 and forms a sliding fit with the guide groove 711. The blocking sleeve 51 is concentric with the through hole of the connecting frame 10, allowing the blocking sleeve 51 to pass through the through hole and contact the ejector pin 6, thus blocking the ejector pin 6. The blocking plate 5 has a circular hole 501, which allows external equipment, such as a telescopic rod, to be directly connected to the connecting frame 10 to move the moving mold 3. When the ejector pin 6 drives the rotating needle component 7 to move with the moving mold 3, the hollow structure of the needle tube 71 will move with the moving mold 3. The sleeve is installed outside the inner rod 52. The convex shaft 521 is embedded in the initial end of the guide groove 711. With the ejector 6, the convex shaft 521 slides along the guide groove 711, converting the axial thrust of the ejector 6 into a circumferential rotational force, driving the needle tube 71 to rotate around the connection point with the ejector 6, so that the needle tube 71 further loosens the injection molded part. At this time, the torsion spring 72 is twisted and stored. After demolding, the ejector 6 moves in the opposite direction, and the convex shaft 521 slides in the opposite direction along the guide groove 711. At the same time, the torsion spring 72 releases the stored force, driving the needle tube 71 to rotate and reset. The needle tube 71 is separated from the inner rod 52 with the ejector 6, preparing for the next injection cycle. The dynamic adaptation of the surface contact force acts on the thin-walled part in the middle of the complex curved surface, reducing the cracking.

[0045] Reference Figures 1-9 When the connecting plate 81 is in the initial position, the distance between the side of the limiting rod 82 away from the connecting plate 81 and the side of the pressure block 61 is less than the thickness of the secondary block 91, and this side of the limiting rod 82 is located between the pressure block 61 and the secondary block 91. Therefore, during reset, the pressure block 61 will contact the secondary block 91 before the limiting rod 82. At this time, the secondary block 91 will be pressed and moved, and the secondary block 91 will compress the return spring 93, causing the limiting rod 82 to be misaligned with the through hole 901. At this time, the limiting member 8... The entire block cannot move, but the connecting frame 10 will stretch the linkage spring 101 until the pressure block 61 passes the secondary block 91. After the secondary block 91 loses its compression, the return spring 93 rebounds to reset the secondary block 91. The limiting rod 82 is concentric with the perforation 901 again. The stretched linkage spring 101 pulls the limiting rod 82 to move, so that the limiting rod 82 quickly enters the perforation 901, thus limiting the secondary block 91. Then the first block 92 is also fixed again, completing the cycle.

[0046] The working principle of this invention is as follows: The moving mold 3 moves along the guide rod 1 in a direction away from the fixed mold 2, driving the ejector pin 6, connecting frame 10, and limiting member 8 to move synchronously and uniformly. The demolding process is initiated. The ejector pin 6 moves with the moving mold 3, and its pressure block 61 first contacts the double-arc surface of the first block 92 of the blocking unit 9. At this time, the limiting rod 82 has not yet disengaged from the through hole 901 of the first block 92. The first block 92 is fixed, blocking the pressure block 61. The ejector pin 6 temporarily stops moving, thereby ejecting the injection molded part. At the same time, the return spring 62 is compressed. Since the first block 92 is relatively thin, the moving mold 3 continues to drive the limiting member 82 to move synchronously and uniformly. The positioning rod 82 moves at a constant speed. The limiting rod 82 first completely disengages from the through hole 901 of the first block 92. The first block 92 loses its limiting constraint. Because the elastic coefficient of the return spring 62 is greater than that of the return spring 93, the return spring 62 quickly rebounds, pushing the pressure block 61 of the ejector pin 6 to squeeze the arc surface of the first block 92. The first block 92 slides along the guide block 41 and compresses the return spring 93. The ejector pin 6 obtains the first short-distance ejection space. The ejector pin slightly pushes the injection molded part, breaking the surface sticking stress and completing the initial loosening. Subsequently, the ejector pin 6 continues to move with the moving mold 3. After the pressure block 61 passes the first block 92, it interacts with the barrier. The secondary block 91 of the first block 92 has double-sided arc-shaped surface contact. The thickness of the secondary block 91 is greater than that of the first block 92, and the limiting rod 82 limits it for a longer time. At this time, the limiting rod 82 has not yet disengaged from the through hole 901 of the secondary block 91, and the secondary block 91 is fixed, blocking the ejector pin 6 again. The return spring 62 is compressed a second time, and the moving mold 3 continues to move. The limiting rod 82 completely disengages from the through hole 901 of the secondary block 91, the secondary block 91 is released from fixation, the return spring 62 rebounds again, and pushes the pressure block 61 to squeeze the arc-shaped surface of the secondary block 91. The secondary block 91 slides along the guide block 41 and compresses the return spring 93, and the ejector pin 6 obtains a second ejection space. During this period, due to the thickness of the secondary block 91, the ejection distance is greater than that in the first stage, further dispersing the sticking force between the injection molded part and the cavity, preparing for the final separation. The ejector pin 6 drives the limiting part 8 to move continuously as a whole. When the connecting plate 81 and the baffle plate 5 fixed by the guide rod 1 are in contact, the limiting effect of all the baffle units 9 is released. The baffle plate 5 provides rigid support, and the baffle sleeve 51 passes through the through hole and is in contact with the ejector pin 6. Under the continuous driving force of the moving mold 3, the ejector pin 6 achieves long-distance ejection. The ejector pin acts fully on the injection molded part, effectively avoiding warping and deformation of complex curved surfaces and soft parts, and ensuring that the injection molded part is completely separated from the cavity.

[0047] After demolding, the moving mold 3 moves in the opposite direction along the guide rod 1, causing the ejector pin 6, connecting frame 10, and limiting member 8 to reset synchronously. Under the elastic force of the return spring 93, the first block 92 and the second block 91 of the blocking unit 9 slide back along the guide block 41. During the reset process, the pressure block 61 contacts the second block 91 before the limiting rod 82 and squeezes it to move, causing the limiting rod 82 to misalign with the through hole 901. The limiting member 8 cannot move temporarily, and the connecting frame 10 stretches the linkage spring 101. After block 61 passes over the secondary block 91 and the first block 92, the return spring 93 pushes the secondary block 91 and the first block 92 to fully reset. The limit rod 82 and the through hole 901 are concentric again. The linkage spring 101 releases the tension and pulls the limit piece 8 to reset. The limit rod 82 re-penetrates the two through holes 901, fixing the secondary block 91 and the first block 92. The ejector pin 6 is fully attached to the moving mold 3 under the action of the return spring 62. The moving mold 3 closes and closes with the fixed mold 2. The mold returns to its initial state and is ready for the next injection cycle.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An injection mold for automotive parts with a rapid injection molding structure, comprising a guide rod (1), characterized in that: It also includes a fixed mold (2) snapped onto the outside of the guide rod (1), a moving mold (3) slidably connected to the outside of the guide rod (1), a housing (4) disposed outside the moving mold (3), a baffle plate (5) fixedly connected to the guide rod (1), an ejector pin (6) slidably connected to the moving mold (3), two rotating pin parts (7) rotatably connected to the ejector pin (6), two blocking units (9) slidably connected to the guide rod (1), two blocking units (9) slidably connected to the housing (4), and a connecting frame (10) fixedly connected to the ejector pin (6). The spinner (7), the limiting member (8), and the blocking unit (9) are all symmetrical about the central axis of the moving mold (3). Both limiting members (8) are connected to the connecting frame (10). The limiting member (8) includes an initial position and a set position. When the limiting member (8) is in the initial position, it is located inside the blocking unit (9) and the two are in contact. When the limiting member (8) is in the set position, it is in contact with the baffle plate (5). When the ejector (6) moves, it moves intermittently and gradually in increasing distance through the blocking unit (9), and finally moves a long distance through the baffle plate (5).

2. The automotive part injection mold with a rapid injection molding structure according to claim 1, characterized in that: The outer shell (4) is provided with a plurality of guide blocks (41), and the blocking unit (9) is slidably connected inside the guide block (41). The blocking unit (9) is divided into a secondary block (91) and a primary block (92). The secondary block (91) is located between the primary block (92) and the baffle plate (5). The secondary block (91) and the primary block (92) are both connected to the outer shell (4) by a return spring (93).

3. The automotive part injection mold with a rapid injection molding structure according to claim 2, characterized in that: The limiting member (8) includes a connecting plate (81) slidably connected to the guide rod (1) and a limiting rod (82) fixedly connected to the connecting plate (81). Both the secondary block (91) and the primary block (92) are provided with through holes (901), and the diameter of the through holes (901) is equal to the diameter of the limiting rod (82).

4. The automotive part injection mold with a rapid injection molding structure according to claim 2, characterized in that: Both the secondary block (91) and the primary block (92) are configured as double-sided arcs on the side near the ejector pin (6), and the thickness of the secondary block (91) is greater than that of the primary block (92).

5. The automotive part injection mold with a rapid injection molding structure according to claim 3, characterized in that: The horizontal axis of the rotating needle component (7) and the moving mold (3) coincides. The rotating needle component (7) includes a needle tube (71) rotatably connected to the ejector (6) and a torsion spring (72) connected between the needle tube (71) and the ejector (6). The needle tube (71) is provided with a guide groove (711) and the inside of the needle tube (71) is hollow.

6. The automotive part injection mold with a rapid injection molding structure according to claim 5, characterized in that: A linkage spring (101) is connected between the connecting frame (10) and the connecting plate (81). A pressure block (61) is fixedly connected to the ejector pin (6). The two ends of the pressure block (61) are set to double-sided arc shape. A through hole is opened on the connecting frame (10).

7. The automotive part injection mold with a rapid injection molding structure according to claim 6, characterized in that: Two sleeves (51) and an inner rod (52) are fixedly connected to the baffle plate (5). A convex shaft (521) is fixedly connected to the inner rod (52). The diameter of the inner rod (52) is equal to the inner diameter of the needle tube (71).

8. The automotive part injection mold with a rapid injection molding structure according to claim 7, characterized in that: The diameter of the convex shaft (521) is equal to the width of the guide groove (711), the stop sleeve (51) is concentric with the through hole, and the stop plate (5) has a circular hole (501).

9. The automotive part injection mold with a rapid injection molding structure according to claim 2, characterized in that: A return spring (62) is connected between the ejector pin (6) and the moving mold (3), and the spring force coefficient of the return spring (62) is greater than that of the return spring (93).

10. The automotive part injection mold with a rapid injection molding structure according to claim 6, characterized in that: When the connecting plate (81) is in the initial position, the distance between the side of the limiting rod (82) away from the connecting plate (81) and the side of the pressure block (61) is less than the thickness of the secondary block (91), and the side of the limiting rod (82) is located between the pressure block (61) and the secondary block (91).

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