Arc-shaped drag chain injection mold and demolding method

Abstract

This invention discloses an arc-shaped drag chain injection mold and a demolding method. The mold includes a moving mold and a fixed mold. The moving mold includes a base plate and a first fixed plate. A moving mold core is provided on the side of the first fixed plate away from the base plate, and a first forming slider is slidably mounted on the moving mold core. The fixed mold includes a panel, a runner plate, a sprue plate, and a second fixed plate stacked sequentially. A fixed mold core is provided on the side of the second fixed plate away from the sprue plate. The moving mold core and the fixed mold core close together to form a product cavity. An inclined guide post is provided on the second fixed plate, which can push the first forming slider to extend into or out of the product cavity. A demolding cylinder is provided on the second fixed plate, and a second forming slider is slidably mounted on the fixed mold core. The demolding cylinder can drive the second forming slider to extend into or out of the product cavity. A through-hole forming insert is provided on the sprue plate, which can extend into the product cavity. This invention can decompose the single mold opening action of the injection molding machine into multiple demolding steps executed in a strict sequence, improving production efficiency and stability.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically to an arc-shaped drag chain injection mold and a demolding method. Background Technology

[0002] Cable chains typically refer to modular, flexible conduits primarily used to protect and guide moving cables, hydraulic lines, air hoses, etc., preventing them from wearing out, getting tangled, or pulling off. They are an indispensable component in modern automated equipment.

[0003] Figure 1 This paper presents a cable chain product, a flexible cable chain, with a length reaching five meters or even longer. Therefore, its production can only be achieved using continuous injection molding. Analysis revealed multiple undercuts in the injection-molded product, based on the ejection direction. These include two rows of wavy and protruding undercuts (400) on both sides, bent undercuts (500) at both ends, and two rows of through holes (600) on both sides. Currently, a suitable injection mold is lacking for this type of product; therefore, it is necessary to design an injection mold to achieve mass production of this product.

[0004] Clearly, the key challenge to the success of the mold lies in how to design the ejection structure of these through holes and ensure that the undercuts on the product can be successfully demolded. Summary of the Invention

[0005] To address some or all of the problems existing in the prior art, the present invention provides an arc-shaped drag chain injection mold, comprising a moving mold and a fixed mold, wherein the fixed mold and the moving mold are closable, and a product cavity is provided on the connecting end face of the fixed mold and the moving mold; the moving mold includes a base plate and a first fixed plate, the base plate being connected to the first fixed plate, and a moving mold core is provided on the side of the first fixed plate away from the base plate, and a first molding slider is slidably mounted on the moving mold core; the fixed mold includes a panel, a runner plate, a sprue plate, and a second fixed plate stacked sequentially, and a fixed mold core is provided on the side of the second fixed plate away from the sprue plate, the moving mold core being connected to the first fixed plate. The fixed mold core closes to form the product cavity. The second fixed plate is provided with an inclined guide post, which can extend into the first forming slider and push the first forming slider into or out of the product cavity. The second fixed plate is provided with a demolding cylinder, and a second forming slider is slidably mounted on the fixed mold core. The output end of the demolding cylinder is connected to the second forming slider, and the demolding cylinder can drive the second forming slider into or out of the product cavity. The sprue plate is provided with a through-hole forming insert, one end of which can pass through the second fixed plate, the fixed mold core and the first forming slider in sequence and then extend into the product cavity.

[0006] As a further improvement of the present invention, the fixed mold core is provided with a first hot runner, the second molding slider is provided with a second hot runner, one end of the second hot runner is connected to the first hot runner, and the other end is connected to the product cavity. The first hot runner is connected to the product cavity. The runner plate is provided with a runner hook, one end of which passes through the sprue plate and extends into the first hot runner.

[0007] As a further improvement of the present invention, the second fixing plate is provided with a plurality of compression springs, the other end of which abuts against the sprue plate. The compression springs are used to drive the sprue plate to move away from the second fixing plate. The sprue plate is provided with a limiting screw that extends into the second fixing plate. The second fixing plate is provided with a limiting step surface, and the limiting screw can abut against the limiting step surface. The limiting screw is used to limit the separation stroke of the sprue plate from the second fixing plate.

[0008] As a further improvement of the present invention, locking buckles are provided on the left and right sides of the second fixing plate, and hooks are provided on the first fixing plate at the corresponding positions of the locking buckles, and the hooks are detachably engaged with the locking buckles.

[0009] As a further improvement of the present invention, the locking buckle includes a fixed base, an unlocking slider, and an unlocking rod. The fixed base is connected to the second fixed plate, the unlocking rod is connected to the flow channel plate, the unlocking slider is slidably connected to the fixed base, the hook can engage with the unlocking slider, and the unlocking rod can slide on the fixed base, thereby pushing the unlocking slider to slide on the fixed base, thereby causing the unlocking slider to engage or disengage with the hook.

[0010] As a further improvement of the present invention, the fixed base is provided with a limiting groove, the unlocking slider is slidably engaged with the limiting groove, the end of the unlocking rod away from the flow channel plate is provided with a pushing slope, the unlocking slider is provided with a driving slope, and the pushing slope can abut against the driving slope; through the cooperation of the pushing slope and the driving slope, the unlocking slider can be driven to slide on the fixed base, thereby making the unlocking slider engage or disengage from the hook.

[0011] As a further improvement of the present invention, the sprue plate is provided with a locking block, the output end of the demolding cylinder is provided with a slider seat, the second molding slider is connected to the slider seat, and the locking block can engage or disengage with the slider seat.

[0012] As a further improvement of the present invention, an ejector plate is slidably provided on the first fixed plate, and an ejector roller insert is provided on the lower end surface of the ejector plate. The ejector roller insert is used to connect with the ejector roller of the injection molding machine. An ejector pin is provided on the upper end surface of the ejector plate, and a top block is provided on the side of the ejector pin away from the ejector plate. The top block can extend into the product cavity.

[0013] On the other hand, the present invention also provides a demolding method for the above-mentioned arc-shaped drag chain injection molded arc-shaped drag chain, comprising the following steps: The injection molding machine drives the moving mold to move away from the fixed mold. Under the drive of the compression spring, the sprue plate separates from the second fixed plate until the limit screw abuts against the limit step surface. During this process, the runner plate moves the runner hook synchronously, and the runner hook pulls the sprue material in the first and second hot runners to move, so that the sprue material is separated from the first and second hot runners. At the same time, the sprue plate moves the locking block and the through-hole forming insert synchronously until the locking block separates from the slider seat and the through-hole forming insert is pulled out of the first forming slider. As the injection molding machine continues to drive the moving mold away from the stationary mold, the sprue plate can no longer move under the action of the limit screw, causing the runner plate to separate from the sprue plate until the unlocking rod drives the unlocking slider to separate from the hook. During this process, the runner plate will drive the runner hook to move synchronously, and the runner hook will pull the sprue material to move until the sprue material is pulled out of the first hot runner, after which the sprue material can be removed from the runner hook. The demolding cylinder drives the slider seat to move, and the slider seat drives the second forming slider to move on the fixed mold core in the direction of pulling out of the product cavity, until the second forming slider is separated from the product in the product cavity. After removing the wavy and protruding undercuts, the injection molding machine continues to drive the moving mold to move away from the fixed mold. The first fixed plate separates from the second fixed plate, and the first fixed plate moves away from the second fixed plate. The inclined guide post slides inside the first molding slider, driving the first molding slider to slide laterally on the moving mold core until the first molding slider is removed from the product cavity. When ejecting the product, the ejector roller of the injection molding machine drives the ejector roller insert to move towards the product cavity. The ejector roller insert drives the ejector plate, ejector pin and ejector block to move synchronously. The ejector block will extend into the product cavity to eject the product from the cavity, thus completing the product ejection and demolding.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention creatively designs a demolding sequence of "first demolding through holes → then demolding bent undercuts → finally demolding wavy undercuts." This sequence follows the principle of "treating undercuts (through holes) with limited internal space first, then treating large external undercuts." Through-hole molding inserts are preferentially extracted in the first step of mold opening, freeing up space for the movement of other sliders. This fundamentally avoids the risk of interference between different demolding mechanisms during movement, ensuring that each demolding action can be completed independently and smoothly, greatly improving the demolding success rate and product integrity.

[0015] 2. This invention, through the precise coordination of various mechanisms, automatically decomposes the single mold opening action of an injection molding machine into multiple demolding steps executed in a strict time sequence. The entire demolding process requires no manual intervention, enabling automated assembly line operation and significantly improving production efficiency and stability.

[0016] 3. This invention employs a unique runner hook design, which reliably pulls the sprue material from the hot runner and demolds it after each molding cycle, removing obstacles to runner processing for continuous injection molding. Simultaneously, after ejection, the product can be repositioned on the moving mold core using the specific structure of its already formed portion (such as wave crests), achieving "in-mold continuation." This enables the efficient and continuous production of arc-shaped drag chains of arbitrary length, solving the problem of not being able to mold ultra-long products in one go.

[0017] 4. The locking block design in this invention effectively locks the second molding slider during mold closing and injection stages, preventing it from retreating and generating flash under high injection pressure, thus ensuring the dimensional accuracy of the product and the service life of the mold. The locking buckle adopts a sloped drive mechanical structure, which has a large locking force, reliable unlocking, better rigidity and safety, and is more suitable for large-tonnage injection molding machines and high-pressure injection molding conditions.

[0018] 5. This invention uses a top block for large-area ejection instead of point-like ejector pins, which can evenly apply force to the product and prevent long, flexible cable chain products from bending, deforming, or turning white during the ejection process, effectively protecting the appearance quality of the product. Attached Figure Description

[0019] To more clearly illustrate the solutions in this invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the drag chain product formed according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the external structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the moving mold in an embodiment of the present invention; Figure 4 This is a schematic diagram of the fixed mold structure in an embodiment of the present invention; Figure 5 This is a top view of the structure of an embodiment of the present invention; Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of the middle AA section; Figure 7 yes Figure 5 Schematic diagram of the cross-sectional structure of the middle BB section; Figure 8 yes Figure 5 Schematic diagram of the cross-sectional structure of the middle CC section; Figure 9 This is a schematic diagram of the locking buckle in an embodiment of the present invention. Detailed Implementation

[0021] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order.

[0022] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0024] like Figure 2-9 As shown, an arc-shaped drag chain injection mold includes a moving mold 100 and a fixed mold 200. The fixed mold 200 and the moving mold 100 are connected by guide pillars and guide sleeves, and their mating surfaces form the product cavity 300.

[0025] The moving mold 100 includes a base plate 1, a first fixed plate 2, a moving mold core 3, a first molding slider 4, and an ejection mechanism. The base plate 1 and the first fixed plate 2 are fixedly connected by screws. The moving mold core 3 is fixed to the side of the first fixed plate 2 away from the base plate. The first molding slider 4 is slidably mounted on the moving mold core 3 through a T-slot and is used to mold the wavy and protruding undercuts on both sides of the product. The ejection mechanism includes an ejector plate 5 slidably disposed within the first fixed plate 2. The lower end of the ejector plate 5 is provided with an ejector pin insert 51, which is used to connect to the ejector pin of the injection molding machine. The upper end of the ejector plate 5 is provided with an ejector pin 52. An ejector block 53 is installed at the end of the ejector pin 52 away from the ejector plate 5. The ejector block 53 can extend into the product cavity 300 for final ejection of the product.

[0026] The fixed mold 200 includes a panel 6, a runner plate 7, a sprue plate 8, and a second fixed plate 9 stacked sequentially. The panel 6 is used to connect with the fixed mold plate of the injection molding machine. A fixed mold core 10 is fixed on the second fixed plate 9, and the moving mold core 3 and the fixed mold core 10 together form the product cavity 300. An inclined guide post 11 is fixed on the second fixed plate 9. The inclined guide post 11 passes obliquely through the fixed mold core 10 and is inserted into the inclined hole of the first molding slider 4, which is used to drive the first molding slider 4 to slide, so that the first molding slider 4 extends into or out of the product cavity 300.

[0027] Demolding cylinders 12 are installed on the left and right sides of the second fixed plate 9, respectively. A second forming slider 13 is slidably mounted on the fixed mold core 10 via a T-shaped guide groove, used for bending and undercutting the ends of the molded product. The output end of the demolding cylinder 12 is connected to the second forming slider 13 via a slider seat 14, and the demolding cylinder 12 can drive the second forming slider 13 to extend into or out of the product cavity 300. A locking block 15 is fixed on the sprue plate 8. When the mold is closed, the lower end of the locking block 15 engages in the groove of the slider seat 14, providing a locking effect; when the mold is opened, the sprue plate 8 drives the locking block 15 to move, disengaging it from the slider seat 14, so that the demolding cylinder 12 can drive the second forming slider 13 to move. By setting the locking block 15, the second forming slider 13 can be effectively locked during mold closing and injection molding, preventing it from retreating and generating flash under high injection pressure, thus ensuring the dimensional accuracy of the product and the service life of the mold.

[0028] like Figure 6 As shown, the sprue plate 8 is also fixed with a through-hole molding insert 16 for through holes on both sides of the molded product. When the mold is closed, the through-hole molding insert 16 passes through the relief holes on the second fixed plate 9, the fixed mold core 10 and the first molding slider 4 in sequence, and its end extends into the product cavity 300.

[0029] like Figure 7As shown, to facilitate injection molding, a first hot runner 101 is formed in the fixed mold core 10, and a second hot runner 131 is formed in the second molding slider 13. The two are connected and inject glue into different positions of the product cavity 300. A runner hook 71 is installed on the runner plate 7. The front end of the runner hook 71 passes through the sprue plate 8 and extends into the end of the first hot runner 101.

[0030] During mold opening, the injection molding machine's mold opening drive force first moves the sprue plate 8, thereby causing the through-hole molding insert 16 to extend out of the first molding slider 4, completing the demolding of the through hole. Simultaneously, the sprue plate 8 also moves the runner plate 7 and runner hook 71, thereby demolding the sprue material in the first hot runner 101 and the second hot runner 131. Then, the demolding cylinder 12 drives the second molding slider 13 to extend out of the product cavity 300, completing the bending and undercut demolding of the product's sides. Next, the first fixing plate 2 separates from the second fixing plate 9, and the inclined guide post 11 pulls the first molding slider 4 out of the product cavity 300, completing the separation of the wave-shaped and protruding undercuts. Finally, by driving the ejector plate 5, ejector pins 52, and ejector blocks 53, the product inside the product cavity 300 is ejected.

[0031] like Figure 8 As shown, the second fixed plate 9 is provided with multiple compression springs 17, the other end of which abuts against the sprue plate 8. The compression springs 17 are used to drive the sprue plate 8 to move away from the second fixed plate 9, providing initial mold opening force during mold opening. Limiting screws 18 are installed on the sprue plate 8, passing through through holes in the second fixed plate 9. A limiting step surface 91 is provided on the second fixed plate 9 at a position corresponding to the limiting screw 18, allowing the limiting screw 18 to abut against the limiting step surface 91. The limiting screw 18 is used to limit the separation stroke between the sprue plate 8 and the second fixed plate 9. When the sprue plate 8 and the second fixed plate 9 separate to their extreme positions, the limiting screw 18 will abut against the limiting step surface 91.

[0032] like Figure 9As shown, locking clips 19 are installed on both sides of the second fixed plate 9. Each locking clip 19 includes a fixed base 191 fixed to the second fixed plate 9, a laterally slidable unlocking slider 192, and an unlocking rod 193 fixed to the runner plate 7. A limiting groove 194 is provided on the fixed base 191, and the unlocking slider 192 is limited within the limiting groove 194 and can slide within it. Hooks 195 are provided at corresponding positions on the first fixed plate 2 and the locking clips 19. During mold closing, the hooks 195 extend into the fixed base 191 and align with the unlocking slider 192. As the runner plate 7 continues to move, it drives the unlocking rod 193 to move, pushing the unlocking slider 192 to slide within the limiting groove 194 until the unlocking slider 192 and the hook 195 are engaged. Thus, through the cooperation of the unlocking slider 192 and the hook 195, the first fixed plate 2 and the second fixed plate 9 are locked and fixed. When the mold is opened, the runner plate 7 first separates, and the unlocking rod 193 slides on the fixed seat 191. At this time, it will not push the unlocking slider 192 to move. After the demolding of the through hole forming insert 16 and the sprue is completed, the unlocking rod 193 will push the unlocking slider 192 to slide in the limiting slide groove 194, so that the unlocking slider 192 is separated from the hook 195. Then the moving mold 100 is driven to separate from the fixed mold 200, so that the first fixed plate 2 and the second fixed plate 9 can be separated to complete the demolding of the first forming slider 4.

[0033] Specifically, the end of the unlocking rod 193 away from the runner plate 7 is provided with a pushing slope 196, and the unlocking slider 192 is provided with a driving slope 197. The pushing slope 196 can abut against the driving slope 197. After the mold is closed, the unlocking rod 193 and the unlocking slider 192 are in direct contact. Therefore, in the initial stage of mold opening (during the gate and through-hole demolding stage), the unlocking rod 193 will not drive the unlocking slider 192 to move. After the gate and through-hole demolding is completed, the pushing slope 196 on the unlocking rod 193 also abuts against the driving slope 197 of the unlocking slider 192. Through the cooperation of the pushing slope 196 and the driving slope 197, the unlocking slider 192 can be driven to slide on the fixed seat 191, thereby separating the unlocking slider 192 from the hook 195 so that the first fixed plate 2 and the second fixed plate 9 can be separated subsequently. The mold closing process is the reverse of the above-mentioned action process. That is, the unlocking rod 193 will drive the unlocking slider 192 to slide in the opposite direction through the inclined surface, so that the unlocking slider 192 will re-engage with the hook 195, thereby realizing the locking and fixing of the first fixing plate 2 and the second fixing plate 9.

[0034] Before using the arc-shaped drag chain injection mold for processing, first install the fixed mold 200 and the moving mold 100 onto the processing position of the injection molding machine, and then fix the ejector roller of the injection molding machine to the ejector roller insert 51. The specific molding and release process is as follows: S1. Injection Molding Closure: The mold closes under the drive of the injection molding machine, all sliders and inserts are in place, and the locking buckle 19 and hook 195 are locked together. The injection molding machine's feeding system injects molten plastic into the runner system through the nozzle, and flows into the product cavity 300 through the first hot runner 101 and the second hot runner 131, where it is cooled and formed.

[0035] S2. Sprue and Demolding Hole: After the product cools, the injection molding machine drives the moving mold 100 to open the mold. Because the mold locking buckle 19 is locked, the first fixed plate 2 and the second fixed plate 9 are not separated temporarily. The spring force of the compression spring 17 pushes the sprue plate 8 (along with the runner plate 7 and the panel 6) upward relative to the second fixed plate 9. During this process: a) The runner plate 7 moves the runner hook 71 upward, pulling the sprue material in the first hot runner 101 and the second hot runner 131 out a certain distance; b) The sprue plate 8 moves the through-hole molding insert 16 and the locking block 15 upward, and the through-hole molding insert 16 is completely extracted from the first molding slider 4 and the product, completing the through-hole demolding. At the same time, the locking block 15 disengages from the slider seat 14. The movement terminates when the limit screw 18 abuts against the limit step surface 91 of the second fixed plate 9.

[0036] S3, Desiccant: The injection molding machine continues to pull the moving mold 100 backward. At this time, the sprue plate 8 is already limited, so the runner plate 7 begins to separate from the sprue plate 8 and continues to move upward. During this process: a) The runner hook 71 pulls the sprue material completely out of the first hot runner 101, which can be removed by the worker; b) The runner plate 7 drives the unlocking rod 193 to move upward, and the inclined surface of the unlocking rod 193 pushes the unlocking slider 192 to slide laterally, so that it disengages from the hook 195, releasing the locking of the main parting surface.

[0037] S4. Demolding the bending undercut: After the main parting surface is unlocked, the demolding cylinder 12 is activated, pulling the slider seat 14 and the second molding slider 13 to move along the core pulling direction, so that they completely exit from the product cavity 300, completing the demolding of the bending undercut at both ends of the product.

[0038] S5. Demolding of wavy and undercut protrusions: The moving mold 100 continues to retract, and the first fixed plate 2 and the second fixed plate 9 completely separate. The first molding slider 4 moves with the moving mold 100 and is limited by the inclined guide post 11. The first molding slider 4 will move laterally on the moving mold core 3 and eventually completely detach from the product cavity 300, so that the wavy and undercut protrusions on both sides of the product are demolded.

[0039] S6. Ejecting the product: After all the undercuts are demolded, the injection molding machine ejector roller pushes the ejector plate 5, ejector pin 52 and ejector block 53 to move synchronously through the ejector roller insert 51. The ejector block 53 ejects the product from the moving mold core 3.

[0040] S7. Continuous Injection Molding: The operator places the ejected product back into the cavity of the return mold core 3, using a pre-formed wave peak for positioning. Then the mold closes, and step SS is repeated for the next injection cycle. Through multiple cycles, a complete arc-shaped cable chain product of the required length is finally injection molded.

[0041] This invention, through innovative mold structure design and rigorous sequential demolding method, successfully solves the problem of continuous injection molding production of long-sized, multi-undercut arc-shaped drag chain products, achieving automated, high-efficiency, and high-reliability production.

[0042] The specific embodiments described above are preferred embodiments of the present invention and are not intended to limit the specific scope of the present invention. The scope of the present invention includes, but is not limited to, these specific embodiments. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. An arc-shaped drag chain injection mold, characterized in that: It includes a moving mold and a fixed mold, wherein the fixed mold and the moving mold are closable and connected, and a product cavity is provided on the connection end face of the fixed mold and the moving mold; The moving mold includes a base plate and a first fixed plate. The base plate is connected to the first fixed plate. A moving mold core is provided on the side of the first fixed plate away from the base plate. A first forming slider is slidably provided on the moving mold core. The fixed mold includes a panel, a runner plate, a sprue plate, and a second fixed plate stacked in sequence. The side of the second fixed plate away from the sprue plate is provided with a fixed mold core. The moving mold core and the fixed mold core are joined together to form the product cavity. The second fixed plate is provided with an inclined guide post. The inclined guide post can extend into the first molding slider and push the first molding slider to extend into or out of the product cavity. The second fixed plate is provided with a demolding cylinder, and the fixed mold core is provided with a second forming slider. The output end of the demolding cylinder is connected to the second forming slider, and the demolding cylinder can drive the second forming slider to extend into or out of the product cavity. The sprue plate is provided with a through-hole forming insert, one end of which can pass through the second fixing plate, the fixed mold core and the first forming slider in sequence and extend into the product cavity.

2. The arc-shaped drag chain injection mold according to claim 1, characterized in that: The fixed mold core is provided with a first hot runner, and the second molding slider is provided with a second hot runner. One end of the second hot runner is connected to the first hot runner, and the other end is connected to the product cavity. The first hot runner is connected to the product cavity. The runner plate is provided with a runner hook. One end of the runner hook passes through the sprue plate and extends into the first hot runner.

3. The arc-shaped drag chain injection mold according to claim 2, characterized in that: The second fixed plate is provided with a plurality of compression springs, the other end of which abuts against the sprue plate. The compression springs are used to drive the sprue plate to move away from the second fixed plate. The sprue plate is provided with a limiting screw, which extends into the second fixing plate. The second fixing plate is provided with a limiting step surface, and the limiting screw can abut against the limiting step surface. The limiting screw is used to limit the separation stroke of the sprue plate and the second fixing plate.

4. The arc-shaped drag chain injection mold according to claim 3, characterized in that: The second fixing plate is provided with locking buckles on its left and right sides respectively, and the first fixing plate is provided with hooks at the corresponding positions of the locking buckles respectively, and the hooks are detachably snapped into the locking buckles.

5. The arc-shaped drag chain injection mold according to claim 4, characterized in that: The locking buckle includes a fixed base, an unlocking slider, and an unlocking rod. The fixed base is connected to the second fixed plate, the unlocking rod is connected to the flow channel plate, the unlocking slider is slidably connected to the fixed base, the hook can engage with the unlocking slider, and the unlocking rod can slide on the fixed base, thereby pushing the unlocking slider to slide on the fixed base, thus causing the unlocking slider to engage or disengage with the hook.

6. The arc-shaped drag chain injection mold according to claim 5, characterized in that: The fixed base is provided with a limiting slide groove, the unlocking slider slides in cooperation with the limiting slide groove, the end of the unlocking rod away from the flow channel plate is provided with a pushing slope, the unlocking slider is provided with a driving slope, and the pushing slope can abut against the driving slope; By engaging the pushing inclined surface with the driving inclined surface, the unlocking slider can be driven to slide on the fixed base, thereby engaging or disengaging the unlocking slider from the hook.

7. The arc-shaped drag chain injection mold according to claim 6, characterized in that: The sprue plate is provided with a locking block, and the output end of the demolding cylinder is provided with a slider seat. The second molding slider is connected to the slider seat, and the locking block can engage or disengage with the slider seat.

8. The arc-shaped drag chain injection mold according to claim 7, characterized in that: A pin plate is slidably provided on the first fixed plate. An ejector roller insert is provided on the lower end surface of the pin plate. The ejector roller insert is used to connect with the ejector roller of the injection molding machine. An ejector pin is provided on the upper end surface of the pin plate. A top block is provided on the side of the ejector pin away from the pin plate. The top block can extend into the product cavity.

9. A demolding method for an arc-shaped cable chain formed using the arc-shaped cable chain injection mold according to claim 8, characterized in that, Includes the following steps: The injection molding machine drives the moving mold to move away from the fixed mold. Under the drive of the compression spring, the sprue plate separates from the second fixed plate until the limit screw abuts against the limit step surface. During this process, the runner plate moves the runner hook synchronously, and the runner hook pulls the sprue material in the first and second hot runners to move, so that the sprue material is separated from the first and second hot runners. At the same time, the sprue plate moves the locking block and the through-hole forming insert synchronously until the locking block separates from the slider seat and the through-hole forming insert is pulled out of the first forming slider. As the injection molding machine continues to drive the moving mold away from the stationary mold, the sprue plate can no longer move under the action of the limit screw, causing the runner plate to separate from the sprue plate until the unlocking rod drives the unlocking slider to separate from the hook. During this process, the runner plate will drive the runner hook to move synchronously, and the runner hook will pull the sprue material to move until the sprue material is pulled out of the first hot runner, after which the sprue material can be removed from the runner hook. The demolding cylinder drives the slider seat to move, and the slider seat drives the second forming slider to move on the fixed mold core in the direction of pulling out of the product cavity, until the second forming slider is separated from the product in the product cavity. After removing the wavy and protruding undercuts, the injection molding machine continues to drive the moving mold to move away from the fixed mold. The first fixed plate separates from the second fixed plate, and the first fixed plate moves away from the second fixed plate. The inclined guide post slides inside the first molding slider, driving the first molding slider to slide laterally on the moving mold core until the first molding slider is removed from the product cavity. When ejecting the product, the ejector roller of the injection molding machine drives the ejector roller insert to move towards the product cavity. The ejector roller insert drives the ejector plate, ejector pin and ejector block to move synchronously. The ejector block will extend into the product cavity to eject the product from the cavity, thus completing the product ejection and demolding.

Images