Core pulling mechanism for injection mold and injection mold
By designing a rotating core-pulling mechanism and a core-pulling assembly with a return spring, the problems of stress concentration and injection molding defects in traditional hook plastic parts under stress were solved, and the production of high-quality arc hook plastic parts was achieved.
Patent Information
- Application Number
- CN202512046751.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-02-13
AI Technical Summary
Traditional hook-type plastic parts are prone to stress concentration when subjected to force, leading to cracking and breakage. Furthermore, defects such as shrinkage and dents are easily generated during injection molding, making it difficult to achieve high-quality molding.
Design a core-pulling mechanism that includes core-pulling components with mirror-like structures and a return spring. Through rotational core-pulling and sequential yielding functions, combined with multiple sets of core-pulling components and a connected cooling circuit, uniform cooling and wall thickness control can be achieved inside the hook.
It achieves precise shell-drawing cavity formation inside the hook, improves the appearance quality of the finished product, avoids structural interference, and improves production consistency and capacity.
Smart Images
Figure CN121515409A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical fields of injection molding products and injection molding molds, and particularly relates to a core pulling mechanism for an injection molding mold of a round hook plastic product and an injection molding mold of a round hook plastic product. BACKGROUND
[0002] Hook-shaped plastic parts need to bear tensile, impact and repeated fatigue loads for a long time in daily use, and the structure shape directly affects the stress distribution, product strength and use safety. Traditional hooks are usually constructed in a right angle or a sharp hook shape, which not only causes significant stress concentration in the stress area and easily leads to failure forms such as cracking and breaking, but also easily scratches users or damages the suspended objects in the use process. At the same time, the sharp corner structure often accompanies defects such as weld marks, shrinkage, poor filling and the like in the injection molding, which limits the product appearance quality and production consistency.
[0003] Based on the above limitations, the industry gradually tries to use a round arc stress configuration to improve the structural reliability. The first generation of round arc hooks designed and optimized by making the hook part into a round arc edge and a horn-shaped appearance can make the stress path more smooth and better adapt to the injection molding process. However, when this structure is used for mass production, appearance defects such as shrinkage and indentation occur on the outer surface of the hook part, and the reason is that the hollow degree is insufficient, the cavity cannot be formed along the outer contour of the hook part, resulting in excessive local wall thickness and uneven cooling shrinkage.
[0004] In order to further improve the product appearance and molding quality, the hook internal structure needs to be redesigned to form a cavity along the arc contour, and the main body mounting part cavity and the hook part cavity are communicated to realize more uniform cooling path and wall thickness control. Thus, the design of the second generation of round arc hooks is formed, but due to the complex arc surface of the internal structure and the fact that the arc center is close to the mold parting surface, the conventional straight or inclined core pulling structure cannot realize demolding, and even interference with other components of the mold may occur. Therefore, a special core pulling mold structure capable of realizing rotary core pulling, sequential displacement, avoiding the mold structure and having reliable reset function is necessary to smoothly form the plastic product. SUMMARY
[0005] The present application aims at providing a core pulling mechanism for an injection molding mold of a round hook plastic product and an injection molding mold of a round hook plastic product to overcome the deficiencies of the prior art.
[0006] The present application achieves the above-mentioned purpose by the following technical solution: a core pulling mechanism for an injection molding mold of a round hook plastic product, comprising a first core pulling assembly and a second core pulling assembly which are mirror image structures, and a reset spring, each core pulling assembly comprising a core pulling core piece, a pull rod piece and a connecting rod piece. The core-pulling core piece is in a mountain-shaped structure, comprising a first connecting foot, a second connecting foot, and a core foot between the two, the first connecting foot and the second connecting foot are provided with a waterway interface for connecting a water inlet pipe or a water outlet pipe, a connecting lug for connecting a return spring hook, and a rotating shaft mounting position for hinging to a movable mold core, and the core foot is provided with a circular arc core-pulling part matched with a circular arc inner cavity of a hook part of a plastic part; The pull rod piece comprises a first pull rod and a second pull rod respectively located on one side of the first connecting foot and the second connecting foot; The connecting rod piece comprises a first connecting rod and a second connecting rod, the two ends of the first connecting rod are respectively hinged to the first connecting foot and the first pull rod, and the two ends of the second connecting rod are respectively hinged to the second connecting foot and the second pull rod; Wherein, the pull rod piece is driven to move downward by the mold opening action, drives the connecting rod piece to rotate the core-pulling core piece around the rotating shaft at the rotating shaft mounting position, and makes the circular arc core-pulling part pull out from the circular arc inner cavity of the plastic part.
[0007] Further, it further comprises a third core-pulling assembly and a fourth core-pulling assembly, the third core-pulling assembly is arranged in a first direction by the first core-pulling assembly, the fourth core-pulling assembly is arranged in the first direction by the second core-pulling assembly, and the adjacent core-pulling core pieces are connected through the water pipe joint to form a waterway circulation.
[0008] A circular arc hook plastic part injection mold, comprising the core-pulling mechanism, further comprising a fixed mold core, a movable mold core, a ejector pin assembly, a first mold plate, a second mold plate, a third mold plate, a fourth mold plate and a fifth mold plate, the movable mold core is installed on the third mold plate, the fixed mold core is installed on the fourth mold plate, the core-pulling mechanism is installed on the movable mold core, and the core foot is in the cavity when the mold is closed; The first mold plate, the second mold plate, the third mold plate, the fourth mold plate and the fifth mold plate are separated in a predetermined order to form core-pulling, driving of the bent pin, rotating core-pulling and product ejection functions in sequence.
[0009] Further, the movable mold core is provided with a rotating shaft and a rotating shaft positioning block for positioning the rotating shaft.
[0010] Further, it further comprises a movable mold insert and a support block, the movable mold insert and the support block abut against the core foot and the bottom of the core-pulling core piece respectively when the mold is closed, so as to prevent the core-pulling core piece from retreating under the action of the injection pressure.
[0011] Further, a limiting rod is installed on the fixed mold core, and the end of the limiting rod is provided with a gate and a scraper structure for scraping the gate away from the movable mold core during mold opening.
[0012] Further, a bent pin structure is provided between the fourth mold plate and the fifth mold plate, and the bent pin structure is used to drive the fixed mold block to retreat during mold opening.
[0013] A method for injection molding a circular arc hook plastic part, comprising the following steps: Pre-step: After the mold is closed, the core-pulling core part is positioned by the movable mold insert and the support block, so as to resist the core foot and prevent it from retreating under the injection pressure; First mold opening step: the first mold plate and the second mold plate are separated, so that the movable mold insert and the support block are separated from the core-pulling core part, and space is left for the core-pulling rotating action; Second mold opening step: the fourth mold plate and the fifth mold plate are separated, and the bent pin structure drives the fixed mold slider to retreat; Core-pulling step: the second mold plate and the third mold plate are separated, the pull rod part is lowered to drive the connecting rod part, so that the core-pulling core part rotates around the rotating shaft, and the circular arc core-pulling part is separated from the inner cavity of the plastic part; Ejection step: the third mold plate and the fourth mold plate are separated, the ejector pin assembly ejects the finished product, and the scraper structure simultaneously scrapes the gate from the movable mold core.
[0014] The beneficial effects of the present application are: The scheme allows the formation of a shell-pulling circular arc inner cavity arranged along the outer arc profile inside the hook part, effectively controls the wall thickness of the plastic part, and significantly improves the appearance defects such as shrinkage and indentation of the finished product. Through the "mountain" shaped core-pulling core part, the structure interference problem caused by the close distance between the circular arc center position and the parting surface is solved, and the rotating core-pulling action is smooth and feasible. The reset spring ensures that the core-pulling assembly is stably reset in the closed mold state, avoiding mold jamming or damage caused by position deviation. The movable mold insert and the support block provide rigid positioning during the injection stage, preventing the core-pulling part from retreating under the injection pressure, effectively avoiding burrs, and improving the quality of the product edge. The special gate scraper structure overcomes the space limitation and realizes reliable gate demolding. The array type multi-group core-pulling assembly and the connected cooling circuit are suitable for multi-cavity mass production, improving the production capacity and maintaining the consistency of the products. The overall structure realizes the complete functional link of core-pulling, positioning, demolding and gate scraping, ensuring the high-quality molding of the second new type of circular arc hook. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 The cross-sectional structure diagram of the first new type of circular arc hook described in the present application.
[0016] Figure 2 The structure diagram and cross-sectional structure diagram of the second new type of circular arc hook (i.e. the finished product) described in the present application.
[0017] Figure 3 The structure diagram of the core-pulling core part of the present application.
[0018] Figure 4 The structure diagram of the core-pulling mechanism described in the present application.
[0019] Figure 5 The cross-sectional structure diagram of the injection mold described in the present application in the mold opening state.
[0020] Figure 6 is a partial structure schematic diagram. Figure 5
[0021] Figure 7 is another partial structure schematic diagram of the present application.
[0022] Figure 8 is still another partial structure schematic diagram of the present application. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. It can be understood that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for the purpose of clear description, and does not limit the connection mode.
[0024] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance, in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application.
[0025] In the related art, the hook plastic part needs to bear tensile, impact and repeated fatigue load in actual use. The traditional right angle or sharp hook structure is easy to cause stress concentration, resulting in cracking, breaking, and scratching the user or damaging the mounted object during use. At the same time, the sharp corner structure is more prone to poor filling, weld marks and shrinkage defects during injection molding, affecting product consistency. In order to improve the structural strength, use safety and molding quality, the present application has developed a first new type of arc hook 7,Figure 1 As shown, it adopts a circular arc edge, a horn-shaped hook part 62 design, so that the force is more uniform, the operation is more smooth, and it is more in line with the injection molding manufacturing process requirements. The first new type of arc hook 7 includes a main body mounting part 61 and a hook part 62 provided on the main body mounting part 61. The hook part 62 and the main body mounting part 61 are integrally formed by injection molding. The hook part 62 has a circular arc edge and a horn-shaped structure.
[0026] It needs to be mentioned that when the first new type of arc hook 7 is produced, the outer surface of the hook part 62 has defects such as shrinkage, indentation, etc., which affect the appearance of the plastic product. After repeated research by technical personnel, it is found that the hook part 62 is not hollow enough inside, too much wall thickness is reserved, and there is no hollow along the circular arc contour of the outer wall of the hook part 62, so that the hook part 62 appears defects such as shrinkage, indentation, etc. Finally, the product of the case (i.e. the final plastic product) is improved to a second new type of arc hook 6 (hereinafter referred to as the finished product), which includes a main body mounting part 61 and a hook part 62 provided on the main body mounting part 61. The hook part 62 and the main body mounting part 61 are integrally formed by injection molding. The hook part 62 has a circular arc edge and a horn-shaped structure. The hook part 62 is internally formed with a circular arc cavity 63 which is hollow along the circular arc contour of the outer wall of the hook part 62. The main body mounting part 61 is hollow away from the hook part 62 and communicates with the circular arc cavity 63 of the hook part 62.
[0027] In order to produce the second new type of arc hook 6, after repeated research by technical personnel, a circular arc hook plastic product injection mold and its demolding method are proposed in the case, as shown in Figures 2-8
[0028] A core pulling mechanism for an injection mold, comprising a first core pulling assembly 101, a second core pulling assembly 102 and a return spring 14. The first core pulling assembly 101 and the second core pulling assembly 102 are mirror image structures. The return spring 14 is respectively hooked on the corresponding core pulling core 11 of the first core pulling assembly 101 and the second core pulling assembly 102.
[0029] The first core pulling assembly 101 includes a core pulling core 11, a pull rod 12 and a connecting rod 13, wherein: The core pulling core 11 has a mountain-shaped structure, including a first connecting foot 111 on one side, a second connecting foot 112 on the other side, and a core foot 113 between the first connecting foot 111 and the second connecting foot 112. The first connecting foot 111 and the second connecting foot 112 are respectively provided with a pipe interface connected by a water inlet pipe 15 and / or a water outlet pipe 16, a connecting ear 111a hooked by a return spring 14, and a rotating shaft mounting position for installing a rotating shaft 111b for hinging the core pulling core 11 to the movable mold core 3. The core foot 113 is provided with a circular arc core pulling part 113a matched with the circular arc cavity 63 of the hook part 62 of the finished product. The pull rod piece 12 comprises a first pull rod 121 on one side of the first connecting leg 111 and a second pull rod 122 on one side of the second connecting leg 112. The connecting rod piece 13 comprises a first connecting rod 131 and a second connecting rod 132, both ends of the first connecting rod 131 are respectively hinged to the first connecting leg 111 and the first pull rod 121, and both ends of the second connecting rod 132 are respectively hinged to the second connecting leg and the second pull rod 122. The first pull rod 121 and the second pull rod 122 pull down, pull the first connecting rod 131 and the second connecting rod 132, and then pull the core-pulling core piece 11 to rotate along the rotation shaft, so that the circular arc core-pulling part 113a on the core leg 113 of the core-pulling core piece 11 rotates together, thereby the circular arc core-pulling part 113a is pulled out from the circular arc inner cavity 63 of the hook part 62 of the finished product, and the core-pulling is realized.
[0030] Specifically, due to the new type of circular arc hook of the plastic product, the characteristic center point position is relatively close to the mold parting surface, and interferes with other parts of the mold, so the core-pulling core piece 11 is designed as a "mountain" shape to avoid interference with other parts of the mold when rotating and core-pulling.
[0031] In addition, in order to avoid or reduce the possibility of jamming and disorder in the resetting process during the mold closing process after the core-pulling core piece 11 completes the rotating core-pulling, the resetting spring 14 is designed to automatically reset the core-pulling core piece 11 during mold closing.
[0032] Preferably, the core-pulling mechanism further comprises a third core-pulling assembly 103 and a fourth core-pulling assembly 104, the third core-pulling assembly 103 is obtained by arraying the first core-pulling assembly 101 in the first direction, the fourth core-pulling assembly 104 is obtained by arraying the second core-pulling assembly 102 in the first direction, and the resetting spring 14 is also matched and arranged between the third core-pulling assembly 103 and the fourth core-pulling assembly 104, and is respectively hooked on the corresponding core-pulling core piece 11. The corresponding core-pulling core pieces 11 between the first core-pulling assembly 101 and the third core-pulling assembly 103 are connected through the water pipe joint 17, the core-pulling core piece 11 of the first core-pulling assembly 101 is connected with the water inlet pipe 15, and the core-pulling core piece 11 of the third core-pulling assembly 103 is connected with the water outlet pipe 16. Similarly, the second core-pulling assembly 102 and the fourth core-pulling assembly 104 also respectively have corresponding water pipe joints 17, water inlet pipes 15 and water outlet pipes 16.
[0033] A circular arc hook plastic product injection mold, comprising the core-pulling mechanism of any one of the foregoing injection molds, further comprising: a fixed mold core 2, a movable mold core 3, a ejector pin assembly 4, a first mold plate 51, a second mold plate 52, a third mold plate 53, a fourth mold plate 54, and a fifth mold plate 55; wherein: The fourth mold plate 54 is provided with a limiting pull hook 551. The third template 53 is adjacent to the fourth template 54. The fixed die core 2 is installed on the fourth template 54. The movable die core 3 is installed on the third template 53, the core-pulling mechanism is installed on the movable die core 3, the movable die core 3 forms a cavity 21 between the fixed die core 2 when the mold is closed, and the core pin 113 is located in the cavity 21 when the mold is closed; the movable die core 3 is provided with a rotating shaft 111b hinged by the core-pulling core 11, and a rotating shaft positioning block 111c installed by the rotating shaft 111b; The ejector pin assembly 4 includes an ejector pin plate 41 located on the side of the third template 53 away from the fourth template 54, an ejector pin support plate 42 located on the side of the ejector pin plate 41 away from the third template 53, and an ejector pin 43 extending from the ejector pin plate 41 and penetrating the movable die core 3; The fifth template 55 is adjacent to the fourth template 54 away from the third template 53, and the limit pull hook 551 has two ends respectively connected to the fourth template 54 and the fifth template 55, for limiting the opening distance between the fourth template 54 and the fifth template 55 to a predetermined distance; The second template 52 is adjacent to the third template 53 away from the second template 52; The first template 51 is adjacent to the second template 52 away from the third template 53, and is connected to the second template 52 by a limiting screw 511, so that the parting distance between the first template 51 and the second template 52 is limited to a predetermined distance.
[0034] Preferably, the movable die insert 512 and the support block 513 are further included, one end of the movable die insert 512 is installed on the first template 51, the other end of the movable die insert 512 penetrates the movable die core 3 and abuts against the core pin 113 when the mold is closed, one end of the support block 513 is installed on the first template 51, the other end of the support block 513 extends to the direction of the movable die core 3 and abuts against the bottom of the core-pulling core 11 when the mold is closed. Specifically, because the injection pressure is relatively large during injection molding, in order to avoid the core-pulling core 11 from retreating under the action of the injection pressure, causing burrs on the finished product, the movable die insert 512 and the support block 513 are designed to resist the core-pulling core 11, thereby avoiding the core-pulling core 11 from retreating during injection molding. In addition, it can also be achieved that the movable die insert 512 and the support block 513 are separated from the core-pulling core 11 a distance when the injection mold is opened for the first time from the first template 51 and the second template 52, so as to leave a rotating space for the core-pulling core 11 to rotate and demold.
[0035] Preferably, a limiting rod 22 is installed on the fixed die core 2, the end of the limiting rod 22 away from the fixed die core 2 extends towards the fixed die core 2 and a gate 221 and a scraper 222 are installed at the end of the limiting rod 22. Specifically, due to the space limitation of the mold structure, the mold cannot adopt the conventional method of ejecting the gate 221 on the side of the movable die core 3. In this technology, the limiting rod 22 is designed on the side of the fixed die core 2, the gate 221 is installed on the other end of the limiting rod 22, and the scraper 222 structure is designed. After the mold parting surface of the fixed die core 2 and the movable die core 3 is separated by a distance, the gate 221 is scraped out of the movable die core by the scraper 222, and the demolding of the gate 221 on the side of the movable die core 3 is realized.
[0036] Preferably, a fixed die sliding block 542 extending into the inner cavity of the fixed die core 2 is further arranged on the fourth mold plate 54, a bent pin structure 541 for pushing and pulling the fixed die sliding block 542 in and out is arranged between the fourth mold plate 54 and the fifth mold plate 55, and the mold cavity 21 is formed between the fixed die core 2, the movable die core 3 and the fixed die sliding block 542 when the mold is closed.
[0037] Preferably, a hydraulic cylinder 31 and a hydraulic oil outlet 33 are further arranged on the movable die core 3. The sliding movement between the mold plates can be realized by using guide columns 56.
[0038] When the mold is opened, the first mold plate 51 and the second mold plate 52 are first separated until the limiting distance of the limiting screw 511, during which the first mold plate 51 pulls down the movable die insert 512 and the support block 513 to provide space for the rotation of the core-pulling core part 11 and avoid interference; then the fourth mold plate 54 and the fifth mold plate 55 are separated until the limiting distance of the limiting pull hook 551, during which the bent pin structure 541 pulls back the fixed die sliding block 542; then the second mold plate 52 and the third mold plate 53 are separated, the second mold plate 52 pulls down the first pull rod 121 and the second pull rod 122, so that the core-pulling core part 11 rotates and performs core pulling, and the core foot 113 is pulled out of the circular arc inner cavity 63 of the hook part 62 of the finished product; finally, the third mold plate 53 and the fourth mold plate 54 are separated, the ejector pin 43 ejects the finished product, i.e. the second new type of circular arc hook 6, and the scraper 222 scrapes the gate 221 out of the movable die core 3, realizing the demolding of the gate 221 in the movable die core 3, and finally completing the mold parting action.
[0039] Preferably, the bent pin structure can be a inclined ejector pin structure.
[0040] In the specification and claims of the present application, the words "comprise / comprising" and the words "have / having" and their conjugates are used to specify the presence of stated features, numbers, steps or components, but do not exclude the presence or addition of one or more other features, numbers, steps, components or combinations thereof.
[0041] Some features of the present application are described in relation to different embodiments for clarity and conciseness, however, these features can also be described in a single embodiment. Conversely, some features of the present application are described in relation to a single embodiment for brevity and conciseness, however, these features can also be described in different embodiments, alone or in any suitable combination.
[0042] Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. Accordingly, the legal scope of the application is defined only by the appended claims.
Claims
1. A core-pulling mechanism for injection molds of arc-shaped hook plastic parts, characterized in that, It includes a first core-pulling assembly (101) and a second core-pulling assembly (102) that are mirror images of each other, and a return spring (14). Each core-pulling assembly includes a core-pulling core (11), a pull rod (12), and a connecting rod (13). The core-pulling part (11) has a mountain-shaped structure, including a first connecting foot (111), a second connecting foot (112), and a core foot (113) located between the two. The first connecting foot (111) and the second connecting foot (112) are respectively provided with water interface for connecting the water inlet pipe (15) or the water outlet pipe (16), a connecting ear (111a) hooked to the return spring (14), and a rotating shaft mounting position for hinged to the moving mold core (3). The core foot (113) is provided with an arc-shaped core-pulling part (113a) that matches the arc-shaped inner cavity (63) of the plastic part hook (62). The tie rod (12) includes a first tie rod (121) and a second tie rod (122) located on one side of the first connecting foot (111) and the second connecting foot (112), respectively; The connecting rod (13) includes a first connecting rod (131) and a second connecting rod (132). The two ends of the first connecting rod (131) are respectively hinged to the first connecting foot (111) and the first pull rod (121), and the two ends of the second connecting rod (132) are respectively hinged to the second connecting foot (112) and the second pull rod (122). Among them, the pull rod (12) is driven to move down by the mold opening action, which drives the connecting rod (13) to make the core-pulling core (11) rotate around the rotating shaft (111b) at the mounting position of the rotating shaft, so that the arc-shaped core-pulling part (113a) is pulled out from the arc-shaped inner cavity (63) of the plastic part.
2. The core-pulling mechanism for injection molds of arc-shaped hook plastic parts according to claim 1, characterized in that, It also includes a third core-pulling assembly (103) and a fourth core-pulling assembly (104). The third core-pulling assembly (103) is arranged in an array along the first direction by the first core-pulling assembly (101), and the fourth core-pulling assembly (104) is arranged in an array along the first direction by the second core-pulling assembly (102). Adjacent core-pulling components (11) are connected by a water pipe joint (17) to form a water circulation system.
3. An injection mold for a circular arc hook plastic part, characterized in that, The mold includes the core-pulling mechanism as described in claim 1 or 2, and further includes a fixed mold core (2), a moving mold core (3), an ejector pin assembly (4), a first template (51), a second template (52), a third template (53), a fourth template (54), and a fifth template (55). The moving mold core (3) is installed on the third template (53), the fixed mold core (2) is installed on the fourth template (54), the core-pulling mechanism is installed on the moving mold core (3), and the core foot (113) is located in the cavity (21) when the mold is closed. The first template (51), the second template (52), the third template (53), the fourth template (54) and the fifth template (55) are separated in a predetermined order to sequentially form the functions of core pulling, driving the bending pin, rotating the core pulling and ejecting the finished product.
4. The injection mold for arc hook plastic parts according to claim 3, characterized in that, The moving mold core (3) is provided with a rotating shaft (111b) and a rotating shaft positioning block (111c) for positioning the rotating shaft (111b).
5. The injection mold for arc hook plastic parts according to claim 4, characterized in that, It also includes a moving mold insert (512) and a support block (513). When the mold is closed, the moving mold insert (512) and the support block (513) respectively abut against the bottom of the core foot (113) and the core-pulling core (11) to prevent the core-pulling core (11) from moving backward under the action of injection pressure.
6. The injection mold for arc hook plastic parts according to claim 5, characterized in that, A limiting rod (22) is installed on the fixed mold core (2). The end of the limiting rod (22) is provided with a gate (221) and a scraper (222) structure, which is used to scrape the gate (221) away from the moving mold core (3) during the mold opening process.
7. The injection mold for arc-shaped hook plastic parts according to claim 6, characterized in that, A bent pin structure (541) is provided between the fourth template (54) and the fifth template (55). The bent pin structure (541) is used to drive the fixed mold slider (542) to retract during the mold opening process.