In-mold assembly mold

Abstract

The application discloses a kind of in-mold assembly mould, belongs to injection mould technical field, including front mould and rear mould;Its characterized in that, the rotating mechanism for driving product is arranged on the rear mould and carries out in-mold rotating action;The rotating mechanism is integrally installed in the rear mould, and is matched with the front mould, for forming and processing first injection product and second injection product;In-mold assembly mould is directly acted on the rotating mechanism of rear mould by power source, drives the second injection product of two sides synchronous rotation towards the first injection product in the middle, to complete the rotating demoulding or in-mold rotating assembly action after injection molding. By the rigid mechanical engagement transmission of rack and pinion, the structure of traditional two-end oil cylinder directly driving rotating block is replaced. This single power source design ensures that the rotation angle and the degree of pressing force of the rotating block on both sides are absolutely synchronous, completely avoids the action delay caused by unbalanced oil circuit, and the uneven force of product contact moment caused by rotation deviation.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically an in-mold assembly mold. Background Technology

[0002] The rotating block of the moving mold drives the first product to rotate to the position of the second product on the moving mold insert, and uses rotational force to directly press and assemble it. At the moment of contact between the first and second products, due to rotational deviation and rotational force, the head of the second product may be scratched, resulting in a low yield. The rotating block is driven by hydraulic cylinders at both ends. If the hydraulic circuit of the cylinders is unbalanced, causing a delay in action, the two ends of the rotating block may not rotate into place simultaneously, resulting in product pressing damage. Moreover, the matching requirements of the driving mechanisms on both sides of the rotating block are extremely high. Even a slight deviation in the matching on both sides will cause damage to the rotating block during movement. The mold has poor stability, high maintenance costs, and short mold life.

[0003] Chinese patent application CN111923343A discloses a rotary micro-injection mold with in-mold assembly function, belonging to the field of micro-injection mold technology. This micro-injection mold includes a fixed mold assembly, a moving mold assembly, a gating assembly, a demolding assembly, a temperature control system, and a core positioning mechanism. This invention applies in-mold assembly technology to micro-injection molds, solving the problems of processing and assembling micro-plastic parts with hollow structures, and achieving efficient, precise, and mass production.

[0004] However, the injection molds disclosed above have poor mold stability, high maintenance costs, and short mold life. Summary of the Invention

[0005] The purpose of this invention is to provide an in-mold assembly mold to solve the problems of poor mold stability, high maintenance costs, and short mold life of existing injection molds.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: it includes a front mold and a rear mold; characterized in that the rear mold is provided with a rotating mechanism for driving the product to perform in-mold rotation. The rotating mechanism is installed inside the rear mold and cooperates with the front mold to form and process the first injection molded product and the second injection molded product. The in-mold assembly mold directly acts on the rotating mechanism of the rear mold through a power source, driving the second injection molded products on both sides to rotate synchronously toward the first injection molded product in the middle, so as to complete the rotational demolding or in-mold rotational assembly action after injection molding.

[0007] As a further embodiment of the present invention: the rotating mechanism specifically includes a second hydraulic cylinder, a hydraulic cylinder rod, a rack, a gear, a motion guide rail, and a rotating block; The second hydraulic cylinder is connected to the hydraulic cylinder oil pipe and obtains hydraulic power through it; the output end of the second hydraulic cylinder is connected to the hydraulic cylinder rod; the hydraulic cylinder rod is connected to the rack and pinion transmission, and the second hydraulic cylinder drives the rack and pinion to perform linear reciprocating motion along the motion guide rail through the hydraulic cylinder rod; The rack meshes with the gear, converting linear motion into rotational motion of the gear; the gear drives the rotating block to rotate.

[0008] As a further embodiment of the present invention: the in-mold assembly mold further includes a rotating core mechanism; The rotating core mechanism is disposed inside the rear mold and includes a rotating core fixing plate and a rotating core push plate; the rotating block is located between the rear mold push plate and the rotating core mechanism, and the rotating block is kinetically connected to the rotating core push plate; When the rotating block is driven to rotate by the gear, it drives the rotating core push plate and related components on the rear mold push plate to move synchronously, so as to act on the first injection molded product and the second injection molded product.

[0009] As a further embodiment of the present invention: the rotating core mechanism further includes a hydraulic cylinder, a rotating core reset rod, and a reset spring; The hydraulic cylinder three is connected to the rotating core fixing plate and is used to drive the rotating core fixing plate to move axially; the rotating core reset rod is connected to the rear mold push plate and the rotating core push plate, and the reset spring is sleeved on the outside of the rotating core reset rod and is used to provide reset elastic force when the rear mold push plate retracts, thereby driving the rotating core push plate to reset.

[0010] As a further embodiment of the present invention: the rotating core mechanism further includes a rotating block top rod fixing block and a rotating block top rod; The rotating block ejector pin fixing block is fixedly installed on the rear mold push plate; the rotating block ejector pin passes through the rotating block ejector pin fixing block, and one end abuts against the bottom surface of the rotating core push plate, while the other end is linked with the rear mold push plate; When the rear mold ejector plate is ejected, the thrust is transmitted to the rotating core ejector plate through the rotating block ejector rod fixing block and the rotating block ejector rod.

[0011] As a further embodiment of the present invention: the front mold is provided with a hydraulic cylinder, a nitrogen spring, a front mold push plate and a rotating core clamping block; The nitrogen spring is fixed inside the front mold, and the hydraulic cylinder cooperates with the nitrogen spring to drive the front mold push plate to perform front mold parting or partial ejection. The rotating core clamping block is located below the front mold push plate. When the mold is closed, the rotating core clamping block is tightly fitted and locked with the rotating core mechanism or rotating block in the rear mold.

[0012] As a further embodiment of the present invention: the rear mold is further provided with a fixed core and a rotation limiting block; The fixed core is used to support and form the main structure of the first injection molded product; the rotation limiting block is disposed on the side of the fixed core or the rotating core mechanism to limit the maximum rotation stroke angle of the rotating core mechanism or the rotating block and prevent over-rotation.

[0013] As a further embodiment of the present invention: the rear mold further includes a rear mold push plate, a rear mold inclined ejector, and a rear mold ejector pin; Both the rear mold angled ejector and the rear mold ejector pin are mounted on the rear mold push plate; the rear mold ejector pin is used to eject the main body of the first injection molded product and the second injection molded product after assembly.

[0014] As a further embodiment of the present invention: the front mold is provided with a first cavity and a second cavity respectively; In the mold-closed state, the first cavity and the molding component of the rear mold cooperate to form the molding space of the first injection molded product, and the second cavity and the molding component of the rear mold cooperate to form the molding space of the second injection molded product; The first injection molded product is a swashplate, and the second injection molded product is a connecting rod.

[0015] As a further aspect of the present invention: after the first injection molded product and the second injection molded product are injection molded in the mold, the rotating mechanism drives the rack and the gear to rotate the rotating block through the second hydraulic cylinder; The rotating block drives the corresponding rotating core mechanism to perform a rotating action, so that the first injection molded product and the second injection molded product generate a relative rotational displacement, thereby realizing the automatic rotational assembly of the swing blade and connecting rod inside the mold.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The rigid mechanical meshing of rack and pinion drives the rotating block, replacing the traditional structure where hydraulic cylinders at both ends directly drive the rotating block. This single power source design ensures absolute synchronization of the rotation angle and clamping force on both sides of the rotating block, completely avoiding action delays caused by hydraulic circuit imbalances and uneven force distribution at product contact due to rotational deviations. The first and second injection-molded products experience uniform force during clamping, fundamentally solving the problems of product head scratches and deformation in traditional solutions, and achieving high yield production.

[0017] 2. The first and second cavities are molded simultaneously within a single mold for the flaps and connecting rods, and the assembly process is fully integrated within the rear mold. No additional external robotic arms or secondary assembly steps are required; two fully assembled sets can be produced directly in a single injection molding cycle, significantly shortening the production cycle, reducing manual assembly costs, and achieving a high degree of automated production.

[0018] 3. The design abandons the extremely high requirements for synchronous fitting of the drive mechanisms on both sides in traditional structures, adopting a simplified pure mechanical gear and rack transmission. This design reduces motion wear points and the risk of jamming, lowering the difficulty of assembly and debugging. Simultaneously, the flexible buffering and rigid limiting provided by the return spring and rotation limit block effectively prevent over-rotation and rigid impact, significantly improving the mold's operational stability under high-pressure, high-frequency production, extending its service life, and reducing long-term maintenance costs.

[0019] 4. The motion guide rail provides linear rigid guidance, and the rotating core clamping block provides high-pressure locking during mold closing. Multiple safety mechanisms ensure that the rotating mechanism maintains extremely high positioning accuracy and mechanical safety during complex in-mold dynamic movements, guaranteeing the continuous and stable operation of the entire production line. Attached Figure Description

[0020] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the front mold in this invention; Figure 3 This is a three-dimensional structural diagram of the rear mold in this invention; Figure 4 This is a three-dimensional structural diagram of the rear mold in this invention; Figure 5 This is a diagram showing the fit between the first injection molded product and the second injection molded product in this invention; Figure 6 This is a three-dimensional structural diagram of the rotating core mechanism in the present invention in a flipped state; Figure 7 This is a partial three-dimensional structural diagram of the rotating core mechanism in this invention; Figure 8 This is a three-dimensional structural diagram of the internal structure of the rotating mechanism in this invention; Figure 9 This is a three-dimensional structural diagram of the rotating core mechanism in this invention.

[0021] Explanation of reference numerals in the attached figures: 100. Front mold; 110. Hydraulic cylinder one; 120. Rotary core clamping block; 130. First cavity; 140. Second cavity; 150. Nitrogen spring; 160. Front mold push plate; 200. Rear mold; 210. Fixed core; 211. Rotation limit block; 220. Rotary core mechanism; 221. Hydraulic cylinder three; 222. Rotary core fixing plate; 223. Rotary core push plate; 224. Rotary core reset rod; 225. Reset spring; 226. Rotary block top rod fixing block; 227. Rotary block top rod; 230. Rear mold push plate; 240. Rear mold angled ejector; 250. Rear mold ejector pin; 260. Rotating mechanism; 261. Hydraulic cylinder two; 262. Hydraulic cylinder connecting rod; 263. Rack; 264. Hydraulic cylinder oil pipe; 265. Gear; 266. Motion guide rail; 267. Rotating block; 300. First injection molded product; 400. Second injection molded product. Detailed Implementation

[0022] The following will be combined with the appendix Figures 1 to 9 The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited.

[0024] This invention provides an in-mold assembly mold through improvements, such as Figures 1-9 As shown, it includes a front mold 100 and a rear mold 200; the rear mold 200 is provided with a rotating mechanism 260 for driving the product to perform in-mold rotation. The rotating mechanism 260 is installed inside the rear mold 200 and cooperates with the front mold 100 to form and process the first injection molded product 300 and the second injection molded product 400. The in-mold assembly mold directly acts on the rotating mechanism 260 of the rear mold 200 through the power source, driving the second injection molded products 400 on both sides to rotate synchronously toward the first injection molded product 300 in the middle, so as to complete the rotation demolding or in-mold rotation assembly action after injection molding.

[0025] In this embodiment: the front mold 100 and the rear mold 200 close together to injection mold the first injection molded product 300 and the second injection molded product 400. After the mold opens, the front mold 100 retracts, and the rotating mechanism 260 inside the rear mold 200 starts operating under the drive of a power source. The power source outputs linear power, which is converted into precise rotational power through the meshing transmission of the rack 263 and gear 265 inside the rotating mechanism 260.

[0026] The rotational power directly drives the rotating block 267 and the rotating core mechanism 220 to rotate, causing the rotating block 267 and the rotating core mechanism 220 to rotate the first injection molded product 300 to the fixed core 210, where it is precisely aligned and pressed with the second injection molded product 400, completing the automatic in-mold assembly.

[0027] In this embodiment: First, the rotating mechanism 260 is installed inside the rear mold 200, featuring a compact structure that eliminates the need for external robotic arms, enabling integrated in-mold production. Second, through rigid rack and pinion transmission, the rotation angle is absolutely synchronized, and the force is uniform, completely eliminating action delays caused by imbalance of the cylinders at both ends and contact scratches caused by rotational deviations, greatly improving the yield rate. Furthermore, this mechanism eliminates the need for complex dual-sided hydraulic synchronous control, significantly reducing fitting requirements, ensuring smooth operation, effectively reducing motion wear and jamming, resulting in high mold stability, low maintenance costs, and a significantly extended mold life. Simultaneously, the first cavity 130 and the second cavity 140 within the front mold 100 adopt a two-cavity design, allowing for two assembled finished products to be obtained in a single mold opening, significantly improving production efficiency.

[0028] See appendix Figure 3 - Appendix Figure 5 and attached Figure 8 The rotating mechanism 260 specifically includes a second hydraulic cylinder 261, a hydraulic cylinder rod 262, a rack 263, a gear 265, a motion guide rail 266, and a rotating block 267; Hydraulic cylinder 261 is connected to hydraulic cylinder oil pipe 264 and obtains hydraulic power through it; the output end of hydraulic cylinder 261 is connected to hydraulic cylinder rod 262; hydraulic cylinder rod 262 is connected to rack 263 for transmission, and hydraulic cylinder 261 drives rack 263 to perform linear reciprocating motion along motion guide rail 266 through hydraulic cylinder rod 262. The rack 263 meshes with the gear 265, converting linear motion into rotational motion of the gear 265; the gear 265 drives the rotating block 267 to rotate.

[0029] In this embodiment, cylinder 261 serves as the power source for the entire rotating mechanism 260, obtaining hydraulic power through a connection to cylinder oil pipe 264. The output end of cylinder 261 is rigidly connected to cylinder rod 262. When hydraulic oil enters cylinder 261, the piston rod drives cylinder rod 262 to perform linear extension and retraction. Cylinder rod 262 is connected to rack 263, causing rack 263 to slide precisely in a straight line along motion guide rail 266. Motion guide rail 266 provides rigid support and linear guidance for rack 263, ensuring a straight and unbiased motion trajectory.

[0030] During linear motion, rack 263 remains meshed with gear 265. According to the principle of rack and pinion transmission, the linear displacement of rack 263 is forcibly converted into the rotational motion of gear 265, and the displacement is strictly proportional to the rotation angle. Gear 265, as the transmission end, directly drives rotating block 267 to perform precise rotational movements.

[0031] The technological benefits of this structure are remarkable. First, the purely mechanical rigid meshing transmission of rack 263 and gear 265 completely replaces the traditional method of directly driving the rotating block from both ends by hydraulic cylinders. This single power source drive design fundamentally eliminates the problem of inconsistent movement at both ends of the rotating block due to uneven oil pressure or response time delays in multiple sets of hydraulic cylinders, ensuring absolute synchronization of the angular velocity and angle on both sides of the rotating block 267 and eliminating rotational deviation at the moment of pressing. Second, the high rigidity and non-slip characteristics of the mechanical transmission make the rotation angle control of the rotating block 267 extremely precise. The force is absolutely uniform at the moment of contact between the first and second products, completely avoiding product head abrasion caused by uneven rotational impact force, and significantly improving the yield rate. At the same time, by eliminating the complex dual-sided hydraulic synchronous control system, the ultra-high precision fitting requirements of the dual-sided drive mechanism are greatly reduced, greatly simplifying the mold assembly and debugging difficulty, significantly reducing maintenance costs, and effectively reducing motion friction and impact, thereby improving the operational stability and service life of the entire mold.

[0032] See appendix Figure 6 - Appendix Figure 9 The in-mold assembly mold also includes a rotating core mechanism 220; The rotating core mechanism 220 is located inside the rear mold 200 and includes a rotating core fixing plate 222 and a rotating core push plate 223; the rotating block 267 is located between the rear mold push plate 230 and the rotating core mechanism 220, and the rotating block 267 is connected to the rotating core push plate 223 in a transmission manner. When the rotating block 267 is driven to rotate by the gear 265, it drives the related components on the rotating core push plate 223 and the rear mold push plate 230 to move synchronously, so as to act on the first injection molded product 300 and the second injection molded product 400.

[0033] In this embodiment, the rotating core mechanism 220 is integrally disposed inside the rear mold 200, mainly consisting of a rotating core fixing plate 222 and a rotating core push plate 223. The rotating block 267 is spatially positioned precisely between the rear mold push plate 230 and the rotating core mechanism 220, and maintains a transmission connection with the rotating core push plate 223. When the gear 265 is driven by the rack 263 and rotates precisely, it directly drives the rotating block 267 to rotate. During rotation, the rotating block 267 transmits torque to the rotating core push plate 223 through mechanical linkage, thereby driving the relevant components on the rear mold push plate 230 to move synchronously. This movement ultimately acts directly on the first injection molded product 300 and the second injection molded product 400, realizing in-mold rotational assembly or assisting in rotational demolding.

[0034] In this embodiment: the structure can achieve precise hierarchical transmission of torque. Through the transmission connection between the rotating block 267 and the rotating core push plate 223, the precision rotational power generated by the front gear rack is smoothly and losslessly transmitted to the key area of ​​the molded product, ensuring that the force and angle of the assembly action are highly uniform, completely solving the problem of product scratches caused by uneven force in the traditional drive method, and greatly improving the product yield.

[0035] This structure enables synchronous linkage of multiple components. The coordinated movement of the rotating core mechanism 220 and the rear mold ejector plate 230 ensures perfect coordination between product assembly and rear mold ejection actions, avoiding motion interference and guaranteeing smooth execution of complex mold movements. This highly integrated structure, with the rotating core mechanism 220, rotating block 267, and rear mold ejector plate 230 all compactly arranged inside the rear mold 200, not only significantly reduces the overall mold volume but also eliminates the need for complex external hydraulic synchronization control through centralized transmission. This significantly reduces the difficulty of mold assembly, greatly reduces motion wear and jamming risks, effectively extends the mold's service life, and lowers long-term maintenance costs.

[0036] See appendix Figure 8 - Appendix Figure 9 The rotating core mechanism 220 also includes a hydraulic cylinder 221, a rotating core reset rod 224, and a reset spring 225; The hydraulic cylinder 221 is connected to the rotating core fixing plate 222 and is used to drive the rotating core fixing plate 222 to move axially; the rotating core reset rod 224 is connected to the rear mold push plate 230 and the rotating core push plate 223, and the reset spring 225 is sleeved on the outside of the rotating core reset rod 224 and is used to provide reset elastic force when the rear mold push plate 230 retracts, thereby driving the rotating core push plate 223 to reset.

[0037] In this embodiment, the rotating core mechanism 220 integrates an independent axial drive and reset system. The hydraulic cylinder 221 is directly connected to the rotating core fixing plate 222, and hydraulic power drives the rotating core fixing plate 222 to move precisely axially along the mold opening and closing direction, achieving axial positioning or alignment adjustment of the product before assembly. The rotating core reset rod 224 acts as a mechanical bridge, passing through and connecting the rear mold push plate 230 and the rotating core push plate 223. The reset spring 225 is sleeved on the outside of the rotating core reset rod 224, with one end abutting against the rear mold push plate 230 and the other end abutting against the rotating core push plate 223. When the rear mold push plate 230 moves forward during ejection or rotational assembly, it compresses the reset spring 225 to store elastic potential energy. When the rear mold push plate 230 retracts (i.e., the thrust is released), the reset spring 225 releases its elastic force, which pulls the rotating core push plate 223 and the connected rotating core mechanism 220 backward through the rotating core reset rod 224, thus completing a stable reset action.

[0038] In this embodiment: This structure enables independent and precise axial adjustment. Through the cooperation of the hydraulic cylinder 221 and the rotating core fixing plate 222, the necessary axial degree of freedom is provided for the rotational assembly of the rotating block 267. This allows the first injection molded product 300 and the second injection molded product 400 to be precisely axially aligned before crimping assembly, effectively preventing crimping damage caused by axial misalignment and further improving the yield rate. This structure provides a reliable automatic reset mechanism. The spring reset system, composed of the reset spring 225 and the rotating core reset rod 224, replaces the structure that relies on complex reverse thrust cylinders or additional hydraulic circuits. When the rear mold push plate 230 completes its retraction, the spring force automatically and smoothly returns the rotating core push plate 223 to its original position, ensuring that each component returns to its precise initial position before the next mold closing, greatly simplifying the control logic. This structure can improve assembly stability and extend service life. Due to the use of mechanical spring reset in conjunction with axial cylinder, the violent collision caused by inertia or hydraulic shock at the end of the rotation core mechanism 220 is avoided. This effectively buffers the impact force of the movement, greatly reduces the risk of mechanism jamming, improves the stability of mold operation, significantly extends the service life of the mold and reduces maintenance costs.

[0039] See appendix Figure 8 - Appendix Figure 9 The rotating core mechanism 220 also includes a rotating block top rod fixing block 226 and a rotating block top rod 227; The rotating block ejector pin fixing block 226 is fixedly installed on the rear mold push plate 230; the rotating block ejector pin 227 passes through the rotating block ejector pin fixing block 226, and one end abuts against the bottom surface of the rotating core push plate 223, while the other end is linked with the rear mold push plate 230. When the rear mold ejector plate 230 is ejected, the thrust is transmitted to the rotating core ejector plate 223 through the rotating block ejector rod fixing block 226 and the rotating block ejector rod 227.

[0040] In this embodiment, the rotating block ejector pin fixing block 226 serves as a rigid mounting base, directly fixed to the rear mold push plate 230, providing a stable support node for the ejection drive. The rotating block ejector pin 227, as the core force transmission rod, passes through and is installed inside the rotating block ejector pin fixing block 226. In terms of spatial layout, one end of the rotating block ejector pin 227 directly abuts against the bottom surface of the rotating core push plate 223, while the other end maintains mechanical linkage with the rear mold push plate 230. When the mold completes injection and enters the ejection stage, the injection molding machine drives the rear mold push plate 230 to move upward (or forward). The displacement of the rear mold push plate 230 synchronously drives the rotating block ejector pin fixing block 226, and through its limiting and guiding function, pushes the rotating block ejector pin 227 to move synchronously along a predetermined axis. The rotating block ejector 227 directly transmits the linear thrust of the rear mold ejector plate 230 to the rotating core ejector plate 223, forcing the rotating core ejector plate 223 and its associated rotating core mechanism 220 to be ejected synchronously, thereby driving the first injection molded product 300 and the second injection molded product 400 to leave the mold cavity.

[0041] In this embodiment: This structure achieves precise synchronous ejection transmission. The mechanism utilizes the rigid limiting of the rotating block ejector pin fixing block 226 and the axial force transmission of the rotating block ejector pin 227 to ensure that the ejection action of the rotating core push plate 223 is strictly synchronized with the stroke of the rear mold push plate 230. This avoids uneven force distribution or jamming of the rotating core mechanism 220 due to asynchronous actions, ensuring precise coordination between rotational assembly and demolding actions. This structure effectively distributes the ejection load. The rotating block ejector pin 227, acting as a force transmission channel, evenly distributes the ejection force to the bottom surface of the rotating core push plate 223, avoiding stress concentration caused by direct drive to local structures. This effectively prevents component deformation or breakage, significantly improving the durability of the mold structure. This structure greatly reduces assembly and maintenance difficulty. This purely mechanical linkage structure replaces complex electrical or hydraulic synchronous control logic, resulting in a simplified and rigidly reliable structure. This not only greatly simplifies the mold assembly and debugging process but also effectively reduces motion wear points, lowers the failure rate during long-term mold operation, significantly extends mold life, and reduces maintenance costs.

[0042] See appendix Figure 2 The front mold 100 is equipped with a hydraulic cylinder 110, a nitrogen spring 150, a front mold push plate 160, and a rotating core clamping block 120. Nitrogen spring 150 is fixed inside front mold 100. Oil cylinder 110 cooperates with nitrogen spring 150 to drive front mold push plate 160 to perform front mold parting or partial ejection. The rotating core clamping block 120 is located below the front mold push plate 160. When the mold is closed, the rotating core clamping block 120 is tightly fitted and locked with the rotating core mechanism 220 or rotating block 267 in the rear mold 200.

[0043] In this embodiment: In the front mold 100, a nitrogen spring 150 is fixedly installed as an elastic energy storage element to provide continuous pre-pressure thrust to the front mold push plate 160. A hydraulic cylinder 110, as the main power source, works in conjunction with the nitrogen spring 150 to drive the front mold push plate 160 axially, achieving pre-parting or partial ejection of the front mold portion. When the mold opens, the injection molding machine pulls the front mold backward, and the hydraulic cylinder 110 and nitrogen spring 150 work together to force the front mold push plate 160 forward, causing the front end structure of the mold to detach from the product, completing partial parting. In the closed state, the rotating core clamping block 120, located below the front mold push plate 160, moves downward with the front mold push plate 160. Its rigid inclined surface tightly fits against the back of the rotating core mechanism 220 or rotating block 267 inside the rear mold 200, forming a physical rigid lock.

[0044] In this embodiment, the structure has the following advantages: First, it provides active core pulling and parting power for the front mold. The cooperation between the hydraulic cylinder 110 and the nitrogen spring 150 solves the problem of the lack of active driving force in the front mold part of traditional injection molds, and can reliably complete the early separation of the complex structure of the front mold, protecting the front end of the product from being pulled.

[0045] Second, it ensures the precise molding of local features of the product. The partial ejection action of the front mold ejector plate 160 allows the front mold part to detach from the product first when the mold opens, making room for the complex rotational assembly action of the rear mold, and ensuring the structural integrity of the first injection molded product 300 and the second injection molded product 400.

[0046] Third, it achieves absolute rigidity locking under high-pressure mold closing. The rotating core clamping block 120 utilizes the wedge principle to apply extremely strong extrusion pre-tightening force to the rotating block 267 and its associated mechanisms in advance before the rear mold push plate 230 drives the rotating core mechanism 220 to perform complex rotational assembly. This completely offsets the axial and lateral impact of the high-pressure melt on the rotating mechanism 260 during injection molding, effectively preventing the rotating core mechanism 220 or rotating block 267 from retreating or shifting due to injection pressure, and ensuring the positioning accuracy of the in-mold rotational assembly.

[0047] Fourth, it reduces the complexity of mold design. By combining the rigid clamping of the front mold with the precise transmission of the rear mold, the necessity of relying on complex hydraulic locking circuits is eliminated, simplifying the structure, improving the operational stability of the mold during frequent opening and closing processes, and significantly extending the overall lifespan of the mold.

[0048] See appendix Figure 4 and attached Figure 6The rear mold 200 is also equipped with a fixed core 210 and a rotation limit block 211; The fixed core 210 is used to support and form the main structure of the first injection molded product 300; the rotation limit block 211 is set on the side of the fixed core 210 or the rotation core mechanism 220 to limit the maximum rotation stroke angle of the rotation core mechanism 220 or the rotation block 267 and prevent over-rotation.

[0049] In this embodiment: Inside the rear mold 200, the fixed core 210 serves as a static support component, primarily used to support and directly form the main structure of the first injection molded product 300 (such as the main blade of a swing vane), providing precise axial and radial positioning references for the first injection molded product 300. The rotation limit block 211 is installed beside the fixed core 210, or adjacent to the rotation core mechanism 220, serving as a physical stop. When the rotation mechanism 260 drives the rotation block 267 and the rotation core mechanism 220 to perform in-mold rotation, the rotation limit block 211 makes mechanical contact with the surface of the rotation block 267 (or the rotation core), using its rigid limiting surface to prevent the rotating component from continuing to rotate, thereby strictly locking the rotation stroke within a preset maximum angle.

[0050] In this embodiment, the rotating limit block 211 completely eliminates the "over-rotation" phenomenon caused by hydraulic system inertia, rack and pinion wear or transmission error by forcibly limiting the position at the physical level, ensuring that the angle is absolutely accurate when the first injection molded product 300 rotates to the position of the second injection molded product 400, thereby ensuring the meshing accuracy of the snap-fit ​​assembly.

[0051] In this embodiment: Since the fixed core 210 firmly supports the main body of the product and the limiting block locks the rotation stroke, it avoids the rotating parts from hitting or squeezing the core under excessive deflection force, which would cause the product head to be scratched, cracked or deformed, thus significantly improving the product yield.

[0052] In this embodiment, as a purely mechanical safety hard limit, this structure eliminates the reliance on complex electronic encoders or high-precision hydraulic servo systems, significantly reducing control difficulty and hardware development requirements. This not only enhances the structural rigidity of the mold under high-pressure, high-frequency production but also effectively extends the mold's lifespan and reduces maintenance costs.

[0053] See appendix Figure 3 The rear mold 200 also includes a rear mold push plate 230, a rear mold inclined ejector 240, and a rear mold ejector pin 250; The rear mold angled ejector 240 and the rear mold ejector pin 250 are both mounted on the rear mold push plate 230; the rear mold ejector pin 250 is used to eject the main body of the first injection molded product 300 and the second injection molded product 400 after assembly.

[0054] In this embodiment, the rear mold 200 integrates a complete ejection system, mainly composed of a rear mold push plate 230, a rear mold angled ejector 240, and a rear mold ejector pin 250. The rear mold push plate 230 is the driving basis for the ejection action, driven by the injection molding machine's ejector roller to perform linear motion. The rear mold angled ejector 240 and the rear mold ejector pin 250 are both fixedly installed on the rear mold push plate 230. Among them, the rear mold ejector pin 250, as the main ejector, directly acts on the assembled product body to smoothly eject the assembly of the first injection molded product 300 and the second injection molded product 400 from the mold cavity. The rear mold angled ejector 240, using its own inclined angle, generates lateral displacement while the rear mold push plate 230 moves upward, for forming and disengaging the undercut structure inside (or on the side) of the product.

[0055] In this embodiment: the vertical ejection force of the rear mold ejector 250 ejects the first injection molded product 300 and the second injection molded product 400, which have completed in-mold assembly, as a whole and ejects them at once, preventing the assembly from loosening or being damaged due to uneven force during demolding, and ensuring the integrity of the product assembly state.

[0056] In this embodiment: the rear mold inclined ejector 240, driven by the rear mold pusher plate 230, uses the inclined surface to generate lateral clearance, ensuring that when the product is ejected upward, the internal lateral buckles or undercuts can disengage from the mold without resistance, effectively preventing product damage, deformation and other defects.

[0057] In this embodiment, the ejection and side core pulling are integrated into the same push plate drive, merging the complex external power source and greatly simplifying the internal mechanism of the mold. The purely mechanical linkage reduces the failure rate, ensures the absolute synchronization of the actions of each demolding component, significantly improves the long-term operational stability of the mold, and reduces maintenance costs.

[0058] See appendix Figure 2 The front mold 100 is provided with a first cavity 130 and a second cavity 140. In the mold-closed state, the first cavity 130 cooperates with the molding component of the rear mold to form the molding space of the first injection molded product 300, and the second cavity 140 cooperates with the molding component of the rear mold to form the molding space of the second injection molded product 400. The first injection molded product 300 is a swing blade, and the second injection molded product 400 is a connecting rod.

[0059] In this embodiment, the front mold 100 has a first cavity 130 and a second cavity 140. When the mold is closed, the first cavity 130 precisely engages with the fixed core 210 and rotating core mechanism 220 within the rear mold 200, forming a closed molding space for the first injection-molded product 300. The second cavity 140 engages with the corresponding molding component within the rear mold 200 to form a closed molding space for the second injection-molded product 400. Specifically, the first injection-molded product 300 is defined as a vane, and the second injection-molded product 400 is defined as a connecting rod. The injection molding machine simultaneously injects molten plastic into these two independent cavities. After cooling and solidification, the vane and connecting rod are directly formed within the mold.

[0060] In this embodiment, the front mold 100, through the layout of the first cavity 130 and the second cavity 140, enables the swing blade and connecting rod to be formed synchronously in the same mold and the same injection cycle, eliminating the need for two separate molds. This significantly shortens the overall production cycle, greatly improves the output efficiency of a single injection cycle, and reduces the manufacturing cost of a single product.

[0061] In this embodiment, since the oscillating blade and connecting rod are formed in the same mold and under the same conditions, they are highly consistent in terms of dimensional shrinkage, material crystallinity, and residual stress. This same-mold forming characteristic ensures that the first injection molded product 300 and the second injection molded product 400 have extremely high dimensional matching and positional overlap during subsequent in-mold rotation assembly, perfectly avoiding assembly interference or loose snap-fit ​​problems caused by differences in mold parting machining accuracy, and fundamentally improving the yield of the final product.

[0062] In this embodiment, the precise layout of the first cavity 130 and the second cavity 140 ensures that the molded flaps and connecting rods are in specific, preset initial relative positions within the mold. This provides a reliable physical space and positioning reference for the rotating mechanism 260 within the rear mold 200 to drive the first injection molded product 300 to rotate and precisely press it onto the second injection molded product 400, ensuring the efficient and stable operation of automated in-mold assembly.

[0063] See appendix Figure 4 - Appendix Figure 9 After the first injection molded product 300 and the second injection molded product 400 are injection molded in the mold, the rotating mechanism 260 drives the rack 263 and gear 265 to rotate the rotating block 267 through the oil cylinder 261. The rotating block 267 drives the corresponding rotating core mechanism 220 to perform a rotation action, so that the first injection molded product 300 and the second injection molded product 400 generate a relative rotational displacement, thereby realizing the automatic rotational assembly of the swing blade and the connecting rod inside the mold.

[0064] In this embodiment: after the first injection molded product 300 (blade) and the second injection molded product 400 (connecting rod) complete injection molding with the cooperation of the front mold 100 and the rear mold 200, the mold enters the mold opening and assembly stage. At this time, the rotating mechanism 260 inside the rear mold 200 is activated. The power source cylinder 261 obtains hydraulic power through the cylinder oil pipe 264, driving the cylinder rod 262 to drive the rack 263 to make precise linear reciprocating motion along the motion guide rail 266. The linear motion of the rack 263 and its meshing gear 265 are forcibly converted into precise rotational motion, and the gear 265 directly drives the rotating block 267 to rotate around the axis. During the rotation, the rotating block 267 is connected to the rotating core push plate 223, driving the entire rotating core mechanism 220 to perform rotational actions synchronously. Since the rotating core mechanism 220 carries the first injection molded product 300, the rotational action causes the first injection molded product 300 to rotate around the axis and move toward the second injection molded product 400 on the fixed core 210, ultimately achieving precise alignment and clamping of the swing blade and connecting rod inside the mold, and completing automatic rotational assembly.

[0065] In this embodiment, the design integrates all the processes that originally required external robotic arms to grasp, align, and insert into the mold, and completes them automatically. The assembled finished product is produced directly in one injection molding cycle, saving a lot of subsequent manual assembly steps, greatly shortening the production cycle and reducing labor costs.

[0066] In this embodiment, the rigid mechanical meshing transmission of rack 263 and gear 265 replaces the traditional two-end hydraulic cylinder drive, ensuring that the rotation angle of rotating block 267 is absolutely synchronized and the force is absolutely uniform. This avoids uneven force during the pressing moment caused by transmission deviation, perfectly solves the problem of product head scratches and deformation, and ensures high product yield.

[0067] In this embodiment, the entire rotary assembly action is completed by a single hydraulic cylinder through mechanical transmission, eliminating the need for complex multi-hydraulic circuit control, eliminating oil circuit delay and action lag, significantly reducing mechanical jamming, assembly difficulties and motion impact, significantly improving the stability of the mold under long-term high-pressure and high-frequency production, and greatly reducing maintenance costs.

[0068] In this embodiment, the complete workflow of the in-mold assembly mold is described, covering the entire process of mold closing, injection molding, mold opening, rotary assembly, and ejection demolding: Phase 1: Mold Closure and Injection Molding Mold Closure Locking: The injection molding machine drives the front mold 100 and the rear mold 200 to close. After the mold is closed, the hydraulic cylinder 110 on the front mold 100 and the nitrogen spring 150 work together to drive the front mold push plate 160 forward (or downward), so that the rotating core clamping block 120 located below the front mold push plate 160 is tightly fitted with the rotating core mechanism 220 or the rotating block 267 in the rear mold 200, forming a physical lock under high pressure to prevent it from collapsing under force during injection.

[0069] Injection molding: High-pressure molten plastic is injected into the mold. With the cooperation of components such as the first cavity 130 of the front mold 100 and the fixed core 210 of the rear mold 200, the first injection molded product 300 (winglet) is formed; simultaneously, with the cooperation of the second cavity 140 of the front mold 100 and corresponding components of the rear mold 200, the second injection molded product 400 (connecting rod) is formed. After pressure holding and cooling, the product solidifies and is formed.

[0070] Phase Two: Mold Making and Pre-construction Preparations Front mold parting: The mold opening action is initiated, and the injection molding machine pulls the front mold 100 backward. At this time, the hydraulic cylinder 110 and the nitrogen spring 150 continue to cooperate, driving the front mold push plate 160 to perform the front mold parting or partial ejection action, causing the structure at the front end of the mold to detach from the product. The front mold 100 and the rear mold 200 are completely separated, and the rotating core clamping block 120 releases the physical locking of the rear mold mechanism.

[0071] The mold opening action is initiated, and the injection molding machine pulls the front mold 100 backward. At this time, the hydraulic cylinder 110 and the nitrogen spring 150 continue to cooperate, driving the front mold push plate 160 to perform the front mold parting or partial ejection action, causing the structure at the front end of the mold to detach from the product. Specifically, the ejection stroke of the front mold push plate 160 is limited by the stroke of the hydraulic cylinder 110, only to meet the minimum distance required for the front mold angled ejector to be pulled out from the undercut shape on the front mold side. The first injection molded product 300 remains on the rotating core on the rear mold side due to the clamping force. The front mold push plate 160 drives the front mold angled ejector and the front mold ejector rod to peel the first injection molded product 300 from the front mold cavity. After the first injection molded product 300 is removed from the cavity, it is supported by the rotating core on the rear mold side and no longer bears the pushing force of the front mold push plate 160. After the front mold push plate 160 completes the demolding and core pulling action, it stops moving forward and waits for the subsequent rotation assembly stage. The contact area between the front mold push plate 160 and the first injection molded product 300 is the edge of the product or a dedicated ejection part. The ejection force is adjusted by the pressure of the hydraulic cylinder 110 to avoid impact damage to the just cooled product.

[0072] The function of the front mold ejector plate 160 is to demold and pull the core, rather than to completely eject the product from the mold. After the first injection molded product 300 leaves the front mold cavity, the front mold ejector plate 160 stops moving, and the first injection molded product 300 is supported by the rotating core on the rear mold side.

[0073] The ejection stroke of the front mold ejector plate 160 is limited by the stroke of the hydraulic cylinder 110, and is only the minimum distance required to meet the core pulling requirement of the front mold inclined ejector, which is much smaller than the stroke of the product ejected from the rear mold.

[0074] Phase 3: In-mold automated rotary assembly: Driven rotation: The rotating mechanism 260 is independently driven by hydraulic cylinder 261. Hydraulic cylinder 261 obtains hydraulic power through hydraulic cylinder pipe 264, driving hydraulic cylinder rod 262 to drive rack 263 to perform linear reciprocating motion along motion guide rail 266. Specifically, rack 263 drives gear to rotate, thereby causing rotating block and rotating core to rotate, rotating the position of the first injection molded product 300, waiting for subsequent crimping assembly.

[0075] Meshing transmission: The linear motion of rack 263 is forcibly converted into the rotational motion of gear 265; gear 265 directly drives rotating block 267 to rotate precisely around the axis.

[0076] Linked Rotary Assembly: The rotating block 267 drives the rotating core mechanism 220 to perform a rotational action. The rotating core mechanism 220 carries the first injection molded product 300 and rotates it, causing the first injection molded product 300 to rotate relative to the second injection molded product 400 on the fixed core 210, using rotational torque to complete precise clamping. During this process, the rotation limit block 211 in the rear mold 200 abuts against the rotating block 267 or the rotating core mechanism 220, precisely limiting the maximum rotational stroke angle and preventing damage caused by over-rotation.

[0077] Phase 4: Ejection, demolding, and resetting: Synchronous ejection: The rear mold push plate 230 ejects upward. Because the rotating block ejector rod fixing block 226 is fixed on the rear mold push plate 230, and the rotating block ejector rod 227 passes through the fixing block and one end abuts against the bottom surface of the rotating core push plate 223, the ejection force of the rear mold push plate 230 is smoothly transmitted to the rotating core push plate 223 through the rotating block ejector rod fixing block 226 and the rotating block ejector rod 227, ensuring that the rotating core mechanism 220 ejects synchronously and avoids uneven force or jamming.

[0078] Overall demolding: The rear mold push plate 230 continues to move upward, and the rear mold ejector 250 installed on it directly and smoothly ejects the assembled first injection molded product 300 and the second injection molded product 400 from the cavity as a whole; at the same time, the rear mold inclined ejector 240 uses the inclined surface to generate lateral displacement, disengaging from the undercut inside the product, ensuring complete demolding of the composite product.

[0079] Mechanism Reset: After ejection, the injection molding machine ejector roller retracts, and the rear mold push plate 230 retracts. The reset spring 225 in the rotary core mechanism 220 is sleeved outside the rotary core reset rod 224. When the rear mold push plate 230 retracts, it releases its elastic force, which pulls the rotary core push plate 223 through the rotary core reset rod 224, causing the entire rotary core mechanism 220 to retract to its initial position. At the same time, the hydraulic cylinder 261 in the rotary mechanism 260 pulls the hydraulic cylinder rod 262, causing the rack 263 to move in the opposite direction. Through the gear 265, the rotating block 267 is driven to rotate in the opposite direction and reset to the initial angle, waiting for the next mold closing injection.

[0080] In this embodiment, the return spring 225 is designed with multiple springs arranged in parallel or with an extended free length to increase the initial elastic force and total stroke force. Alternatively, a nitrogen spring assembly can be added between the rotating core push plate 223 and the fixed plate to assist in the return and compensate for the force attenuation of ordinary helical springs.

[0081] A nitrogen spring assembly is an elastic element that uses high-pressure nitrogen as its working medium. Its principle is as follows: high-pressure nitrogen is filled into a sealed cylinder. When the piston rod is compressed, it pushes the piston to compress the nitrogen, which generates a reverse thrust. After the external force is removed, the nitrogen expands, pushing the piston rod out to return to its original position. Compared to ordinary coil springs, the elastic force of a nitrogen spring assembly decreases very little throughout its stroke, remaining approximately constant. It also features high initial elastic force, small size, and long lifespan. Therefore, it is suitable for mold reset or ejection applications requiring large initial thrust, long stroke, and stable force.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and inventive features disclosed herein.

Claims

1. An in-mold assembly mold, comprising a front mold (100) and a rear mold (200); characterized in that, The rear mold (200) is provided with a rotating mechanism (260) for driving the product to rotate within the mold. The rotating mechanism (260) is installed inside the rear mold (200) and cooperates with the front mold (100) to form and process the first injection molded product (300) and the second injection molded product (400). The in-mold assembly mold directly acts on the rotating mechanism (260) of the rear mold (200) through the power source, driving the second injection molded products (400) on both sides to rotate synchronously toward the first injection molded product (300) in the middle, so as to complete the rotation demolding or in-mold rotation assembly action after injection molding. The rotating mechanism (260) specifically includes a second hydraulic cylinder (261), a hydraulic cylinder rod (262), a rack (263), a gear (265), a motion guide rail (266), and a rotating block (267). The output end of the second hydraulic cylinder (261) is connected to the hydraulic cylinder rod (262); the hydraulic cylinder rod (262) is connected to the rack (263) for transmission, and the second hydraulic cylinder (261) drives the rack (263) to perform linear reciprocating motion along the motion guide rail (266) through the hydraulic cylinder rod (262).

2. The in-mold assembly mold according to claim 1, characterized in that: The second hydraulic cylinder (261) is connected to the hydraulic cylinder oil pipe (264) and obtains hydraulic power through it; The rack (263) meshes with the gear (265) to convert linear motion into rotational motion of the gear (265); the gear (265) drives the rotating block (267) to rotate.

3. The in-mold assembly mold according to claim 2, characterized in that: The in-mold assembly mold also includes a rotating core mechanism (220). The rotating core mechanism (220) is disposed inside the rear mold (200) and includes a rotating core fixing plate (222) and a rotating core push plate (223); the rotating block (267) is located between the rear mold push plate (230) and the rotating core mechanism (220), and the rotating block (267) is connected to the rotating core push plate (223) in a transmission manner; When the rotating block (267) is driven to rotate by the gear (265), it drives the rotating core push plate (223) and the related components on the rear mold push plate (230) to move synchronously, so as to act on the first injection molded product (300) and the second injection molded product (400).

4. The in-mold assembly mold according to claim 3, characterized in that: The rotating core mechanism (220) also includes a hydraulic cylinder (221), a rotating core reset rod (224), and a reset spring (225). The hydraulic cylinder (221) is connected to the rotating core fixing plate (222) and is used to drive the rotating core fixing plate (222) to move axially; the rotating core reset rod (224) is connected to the rear mold push plate (230) and the rotating core push plate (223), and the reset spring (225) is sleeved on the outside of the rotating core reset rod (224) and is used to provide reset elastic force when the rear mold push plate (230) retracts, thereby driving the rotating core push plate (223) to reset.

5. The in-mold assembly mold according to claim 4, characterized in that: The rotating core mechanism (220) also includes a rotating block top rod fixing block (226) and a rotating block top rod (227). The rotating block ejector pin fixing block (226) is fixedly installed on the rear mold push plate (230); the rotating block ejector pin (227) passes through the rotating block ejector pin fixing block (226), and one end abuts against the bottom surface of the rotating core push plate (223), while the other end is linked with the rear mold push plate (230); When the rear mold push plate (230) is ejected, the thrust is transmitted to the rotating core push plate (223) through the rotating block push rod fixing block (226) and the rotating block push rod (227).

6. The in-mold assembly mold according to claim 3, characterized in that: The front mold (100) is equipped with a hydraulic cylinder (110), a nitrogen spring (150), a front mold push plate (160), and a rotating core clamping block (120). The nitrogen spring (150) is fixed inside the front mold (100), and the hydraulic cylinder (110) cooperates with the nitrogen spring (150) to drive the front mold push plate (160) to perform front mold parting or partial ejection actions. The rotating core clamping block (120) is located below the front mold push plate (160). When the mold is closed, the rotating core clamping block (120) is tightly fitted and locked with the rotating core mechanism (220) or rotating block (267) in the rear mold (200).

7. An in-mold assembly mold according to claim 3, characterized in that: The rear mold (200) is also provided with a fixed core (210) and a rotation limiting block (211). The fixed core (210) is used to support and form the main structure of the first injection molded product (300); the rotation limiting block (211) is disposed on the side of the fixed core (210) or the rotation core mechanism (220) to limit the maximum rotation stroke angle of the rotation core mechanism (220) or the rotation block (267) to prevent over-rotation.

8. The in-mold assembly mold according to claim 1, characterized in that: The rear mold (200) also includes a rear mold push plate (230), a rear mold inclined ejector (240), and a rear mold ejector pin (250). The rear mold angled ejector (240) and the rear mold ejector rod (250) are both mounted on the rear mold push plate (230); the rear mold ejector rod (250) is used to eject the main body of the first injection molded product (300) and the second injection molded product (400) after assembly.

9. An in-mold assembly mold according to claim 3, characterized in that: The front mold (100) is provided with a first cavity (130) and a second cavity (140). In the mold-closed state, the first cavity (130) cooperates with the molding component of the rear mold to form the molding space of the first injection molded product (300), and the second cavity (140) cooperates with the molding component of the rear mold to form the molding space of the second injection molded product (400). The first injection molded product (300) is a swing blade, and the second injection molded product (400) is a connecting rod.

10. An in-mold assembly mold according to claim 9, characterized in that: After the first injection molded product (300) and the second injection molded product (400) are injection molded in the mold, the rotating mechanism (260) drives the rack (263) and the gear (265) to rotate through the second oil cylinder (261); The rotating block (267) drives the corresponding rotating core mechanism (220) to perform a rotation action, so that the first injection molded product (300) and the second injection molded product (400) generate a relative rotational displacement, thereby realizing the automatic rotational assembly of the swing blade and the connecting rod inside the mold.

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