Injection mold for agricultural irrigation plastic valve

Abstract

The utility model belongs to mould technical field especially relates to a kind of agricultural irrigation plastic valve injection mould.The utility model, including fixed mould and movable mould, the injection top plate is equipped in the upper portion of fixed mould, fixed mould insert is equipped in the inside of fixed mould, movable mould insert is equipped in the inside of movable mould, forming upper cavity is equipped in the inside of fixed mould insert, forming lower cavity is equipped in the inside of movable mould insert.The utility model in use process, using middle core subelement, left core subelement and right core subelement respectively form the middle part interface, import and export of plastic valve, realize the one-time forming of complex structure, without secondary processing, significantly improve production efficiency, and by design double cavity structure, two products can be formed once, greatly improve the output of unit time, reduce production cost.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to an injection mold for agricultural irrigation plastic valves. Background Technology

[0002] In agricultural irrigation systems, plastic valves are crucial components for controlling water flow, resulting in high demand and stringent quality requirements. Traditional plastic valve production typically involves separate injection molding followed by assembly, or single-cavity molds for one-time molding of a single product. This approach suffers from low production efficiency, poor product precision, and high assembly costs. Particularly concerning are the valve's central interface, inlet, and outlet sections. Due to their complex structures, traditional molds often require intricate core-pulling mechanisms or secondary processing after injection molding to complete these parts. This not only increases production steps but also easily leads to large dimensional errors and poor sealing performance. Furthermore, the inefficient design of core components in traditional molds can cause product deformation or damage during demolding, affecting product yield. Therefore, there is an urgent need to design an injection mold for agricultural irrigation plastic valves that can mold multiple complete plastic valves in a single operation, eliminating the need for secondary processing and providing structural stability.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, Chinese patent discloses a plastic injection molding machine [application number: 201910479507.2], which includes an injection cylinder, a vertical base plate, a base plate, an injection head, a material extraction pipe with a control valve, a pressure plate, a pressure rod, a slide frame, a linkage plate, a drive mechanism, a drive linkage, a linkage mechanism, a horizontal bracket, and a mold mounting base. The injection cylinder is fixedly connected to the vertical base plate; the vertical base plate is fixedly connected to the base plate; the front end of the injection cylinder is fixedly connected to the injection head and the material extraction pipe; the pressure plate is slidably connected inside the injection cylinder; the two ends of the pressure rod are respectively fixedly connected to the pressure plate and the linkage plate; and the middle end of the pressure rod is slidably connected to the slide frame. However, this solution is not suitable for producing plastic valves and is difficult to mold multiple complete plastic valves at once, requiring secondary processing. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing an injection mold for agricultural irrigation plastic valves.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An injection mold for an agricultural irrigation plastic valve includes a fixed mold and a moving mold. An injection top plate is provided above the fixed mold. A fixed mold insert is provided inside the fixed mold, and a moving mold insert is provided inside the moving mold. An upper molding cavity is provided inside the fixed mold insert, and a lower molding cavity is provided inside the moving mold insert. When the mold is closed, the upper molding cavity and the lower molding cavity fit together to form a complete cavity. A central core component, a left core component, and a right core component are provided between the fixed mold insert and the moving mold insert. These three core components correspond to the positions of the cavities. An ejector is provided below the moving mold.

[0007] In the above-mentioned injection mold for agricultural irrigation plastic valves, the core component includes two cores disposed between the fixed mold insert and the moving mold insert, and the tail of the core component is provided with a chuck.

[0008] In the above-mentioned injection mold for agricultural irrigation plastic valves, the diameter of the chuck is larger than the diameter of the core, and the core extends into the cavity.

[0009] In the above-mentioned injection mold for agricultural irrigation plastic valves, the left core component includes a left core connecting slide disposed between the fixed mold insert and the moving mold insert, and the left core connecting slide is provided with a left core extending into the cavity.

[0010] In the above-mentioned injection mold for agricultural irrigation plastic valves, the moving mold is provided with a left limiting track, the left core connecting slide is slidably engaged with the left limiting track, and the left core connecting slide is driven by a cylinder.

[0011] In the above-mentioned injection mold for agricultural irrigation plastic valve, the right core component includes a right core connecting slide disposed between the fixed mold insert and the moving mold insert. The right core connecting slide is provided with a right core that is directly opposite to the left core. The right core is fitted with a right core middle sleeve and a right core sleeve.

[0012] In the above-mentioned injection mold for agricultural irrigation plastic valves, the moving mold is provided with a right limiting rail, the right core connecting slide is slidably engaged with the right limiting rail, and the right core connecting slide is driven by a cylinder.

[0013] In the above-mentioned injection mold for agricultural irrigation plastic valves, the fixed mold is provided with an inclined guide post that engages with the right core connecting slide, and a positioning guide post is provided between the fixed mold and the moving mold.

[0014] In the above-mentioned injection mold for agricultural irrigation plastic valves, the ejector includes an ejector plate located below the moving mold, and the ejector plate is provided with ejector pins extending into the cavity.

[0015] In the above-mentioned injection mold for agricultural irrigation plastic valves, a bottom plate and a bottom plate are provided below the ejector plate, and mold feet are provided between the bottom plate and the moving mold.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. In the process of use, this utility model uses a central core component, a left core component, and a right core component to form the central interface, inlet, and outlet of the plastic valve, respectively, realizing one-time molding of complex structures without secondary processing, which significantly improves production efficiency.

[0018] 2. This utility model, through the design of a dual-cavity structure, can mold two products at once, which greatly increases the output per unit time and reduces production costs.

[0019] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0022] Figure 3 This is a partial structural schematic diagram of the present invention.

[0023] Figure 4 This is a partial structural schematic diagram of another aspect of this utility model.

[0024] Figure 5 This is a structural diagram of a plastic valve product.

[0025] In the diagram: 1. Fixed mold; 2. Moving mold; 3. Injection top plate; 4. Fixed mold insert; 5. Moving mold insert; 6. Upper molding cavity; 7. Lower molding cavity; 8. Middle core component; 9. Left core component; 10. Right core component; 11. Ejector / send component; 12. Middle core; 13. Chuck; 14. Left core connecting slide; 15. Left core; 16. Left limit rail; 17. Right core connecting slide; 18. Right core middle sleeve; 19. Right core sleeve; 20. Right limit rail; 21. Inclined guide post; 22. Positioning guide post; 23. Ejector plate; 24. Ejector pin; 25. Bottom pin plate; 26. Bottom plate; 27. Mold foot; 28. Plastic valve product 100. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-4As shown, an injection mold for an agricultural irrigation plastic valve includes a fixed mold 1 and a moving mold 2. The fixed mold 1 is provided with an injection top plate 3. The fixed mold 1 is provided with a fixed mold insert 4. The moving mold 2 is provided with a moving mold insert 5. The fixed mold insert 4 is provided with a molding upper cavity 6. The moving mold insert 5 is provided with a molding lower cavity 7. When the mold is closed, the molding upper cavity 6 and the molding lower cavity 7 fit together to form a complete cavity. Between the fixed mold insert 4 and the moving mold insert 5, there are a central core component 8, a left core component 9, and a right core component 10. The central core component 8, the left core component 9, and the right core component 10 correspond to the positions of the cavity. The moving mold 2 is provided with an ejector demolding component 11 below it.

[0028] In this embodiment, an injection top plate 3 is fixedly installed on the top of the fixed mold 1. The injection top plate 3 has a main flow channel and a branch flow channel inside, which can evenly distribute the molten plastic into the cavity. The fixed mold insert 4 is fixed inside the fixed mold 1 by bolts. The moving mold insert 5 is installed inside the moving mold 2. The fixed mold insert 4 has an upper molding cavity 6 machined inside, and the moving mold insert 5 has a lower molding cavity 7 machined inside. The surface roughness of the cavities of both is controlled below Ra0.8μm to ensure the surface quality of the product. When the mold closes, the upper molding cavity 6 and the lower molding cavity 7 fit precisely together, forming two symmetrically distributed complete cavities, which can simultaneously mold two plastic valve products 100. Between the parting surface of the fixed mold insert 4 and the moving mold insert 5, the central core component 8, the left core component 9, and the right core component 10 are arranged in a triangular shape: the central core component 8 is located in the middle of the cavity and is used to mold the middle interface of the valve; the left core component 9 and the right core component 10 are located on both sides of the cavity, corresponding to the inlet and outlet of the valve. The bottom of the moving mold 2 is equipped with an ejector and demolding component 11, which can smoothly eject the product from the moving mold insert 5 after injection molding. The split insert design enables quick cavity replacement; the multi-core component works together to achieve one-time molding of complex structures; the dual-cavity layout doubles the production efficiency.

[0029] Combination Figure 1-4 As shown, the core component 8 includes two cores 12 disposed between the fixed mold insert 4 and the moving mold insert 5, and the tail of the core 12 is provided with a chuck 13.

[0030] Specifically, the core component 8 consists of two independent cores 12, each corresponding to one of the two cavities. The tail of the core 12 is fitted with a chuck 13 via an interference fit. The chuck 13 and the positioning hole of the fixed mold insert 4 are fitted with a clearance fit. During assembly, the front end of the core 12 passes through the guide hole of the fixed mold insert 4, and the tail chuck 13 is clamped between the fixed mold 1 and the fixed mold insert 4. Axial fixation is achieved by the clamping force of the fixed mold 1. The independent layout design of the two cores breaks through the production capacity limitation of the traditional single core mold, realizes the simultaneous molding of two products, and enables the rapid replacement and precise positioning of the core components through the chuck structure.

[0031] The diameter of the chuck 13 is larger than the diameter of the core 12, and the core 12 extends into the cavity.

[0032] In this embodiment, during assembly, the end face of the chuck 13 fits tightly against the positioning surface of the fixed mold insert 4, and the axial preload is generated by the locking force of the fixed mold 1, which effectively resists the axial impact force during the injection molding process. The stepped structure enhances the overall rigidity of the core component; the extended design ensures that the middle interface is fully formed without subsequent processing, thus improving the product's sealing performance.

[0033] Combination Figure 3 , Figure 4 As shown, the left core component 9 includes a left core connecting slide 14 disposed between the fixed mold insert 4 and the moving mold insert 5, and the left core connecting slide 14 is provided with a left core 15 extending into the cavity.

[0034] In this embodiment, the left core component 9 consists of a left core connecting slide 14 and a left core 15. The left core 15 is fixed to the front end of the left core connecting slide 14 by a threaded connection. The front end of the left core 15 is machined with a molding structure that matches the valve inlet, including features such as a flange face and a sealing ring groove. During assembly, the left core connecting slide 14 is installed in the groove of the moving mold 2, and the left core 15 extends into the cavity through the guide hole of the moving mold insert 5. Its front end maintains a 0.5mm gap with the side of the middle core 12 to ensure that the plastic melt can fully fill the cavity. The combined structure facilitates the replacement and maintenance of the left core. Precise position control ensures the connection accuracy between the inlet and the middle interface, improving the valve flow performance.

[0035] The moving mold 2 is provided with a left limiting track 16, and the left core connecting slide 14 is slidably engaged with the left limiting track 16. The left core connecting slide 14 is driven by a cylinder.

[0036] In this embodiment, during operation, the cylinder drives the left core connecting slide 14 to move linearly along the left limit track 16, thereby realizing the core pulling and resetting action of the left core 15.

[0037] Combination Figure 4 As shown, the right core component 10 includes a right core connecting slide 17 disposed between the fixed mold insert 4 and the moving mold insert 5. The right core connecting slide 17 is provided with a right core 18 disposed opposite to the left core 15. The right core 18 is fitted with a right core middle sleeve 19 and a right core sleeve 20.

[0038] In this embodiment, the right core component 10 includes a right core connecting slide 17, a right core 18, a right core middle sleeve 19, and a right core sleeve 20. The right core 18 is installed on the right core connecting slide 17 with an interference fit, and its axis coincides with the axis of the left core 15 (coaxiality error ≤ 0.02mm) to ensure the concentricity of the valve inlet and outlet. The right core middle sleeve 19 and the right core sleeve 20 are sequentially sleeved on the outside of the right core 18, and the three are connected by a key to achieve synchronous movement. The outer wall of the right core sleeve 20 is machined with a threaded structure and sealing surface that matches the valve outlet. The right core middle sleeve 19 is used to form the transition flow channel between the outlet and the middle interface. The multi-layer nested structure realizes the one-time forming of the complex outlet structure. The coaxial design with the left core ensures smooth valve flow and reduces head loss.

[0039] The moving mold 2 is provided with a right limiting rail 21, and the right core connecting slide 17 is slidably engaged with the right limiting rail 21. The right core connecting slide 17 is driven by a cylinder.

[0040] In this embodiment, during operation, the right core connecting slide 17 moves along the right limit track 21 under the drive of the cylinder, driving the right core 18, the right core middle sleeve 19 and the right core sleeve 20 to enter and exit the cavity simultaneously.

[0041] Combination Figure 1-2 As shown, the fixed mold 1 is provided with an inclined guide post 22 that engages with the right core connecting slide 17, and a positioning guide post 23 is provided between the fixed mold 1 and the moving mold 2.

[0042] In this embodiment, the inclined guide post 22 is fixed to the inner side of the fixed mold 1 by bolts. The axis of the inclined guide post 22 forms a 15° angle with the mold closing direction, and its front end passes through the inclined guide hole on the right core connecting slide 17. When the mold is closed, the inclined guide post 22 moves downward with the fixed mold 1, and pushes the right core connecting slide 17 forward along the right limit track 21 through the inclined surface, thereby realizing the reset action of the right core 18.

[0043] Combination Figure 1-2 As shown, the ejector demolding component 11 includes an ejector plate 24 disposed below the moving mold 2, and the ejector plate 24 is provided with ejector pins 25 extending into the cavity.

[0044] In this embodiment, the ejector demolding component 11 includes an ejector plate 24 and an ejector pin 25. The ejector plate 24 is made of two steel plates connected by bolts, with the tail of the ejector pin 25 clamped in the middle. The multi-point symmetrical ejection design avoids product demolding deformation; the high-precision fit ensures smooth ejector pin movement and extends the service life of the mold.

[0045] Combination Figure 1-2 As shown, a bottom pin plate 26 and a bottom plate 27 are provided below the ejector plate 24, and a mold foot 28 is provided between the bottom plate 27 and the moving mold 2.

[0046] In this embodiment, a bottom pin plate 26 and a bottom plate 27 are sequentially installed below the ejector plate 24, and the three are connected by guide pillars. The bottom pin plate 26 provides rigid support for the ejector plate 24, preventing bending deformation during ejection. The bottom plate 27 is fixed to the moving mold plate of the injection molding machine with bolts, providing a mounting base for the entire moving mold part. The multi-layer plate structure improves the rigidity of the ejection mechanism; sufficient ejection stroke ensures complete product demolding; and the modular design facilitates mold maintenance and component replacement.

[0047] The working principle of this utility model is as follows:

[0048] During mold closing, the moving mold 2 moves towards the fixed mold 1. Guided by the positioning guide post 23, the fixed mold 1 and the moving mold 2 close accurately. Simultaneously, the left core connecting slide 14 moves along the left limit track 16 under the drive of the cylinder, driving the left core 15 into the corresponding position in the cavity. The right core connecting slide 17 moves along the right limit track 21 under the combined action of the inclined guide post 22 and the cylinder, causing the right core 18 to enter the corresponding position in the cavity. The middle core 12, fixed by the chuck 13, is also in the designated position in the cavity. At this time, the upper molding cavity 6 and the lower molding cavity 7 form a complete cavity. The middle core 8, left core 9, and right core 10 are respectively located in the corresponding positions in the cavity, preparing for injection molding. The molten plastic is injected into the cavity through the injection top plate 3. Under the combined action of component 8, left core component 9, and right core component 10, the molten plastic cools and solidifies to form two plastic valve products with a central interface, an inlet, and an outlet. During mold opening, the moving mold 2 separates from the fixed mold 1. During this process, the inclined guide post 22 drives the right core connecting slide 17 to move in the opposite direction along the right limit track 21, causing the right core 18 to be extracted from the product. Simultaneously, the left core connecting slide 14, driven by a cylinder, moves in the opposite direction along the left limit track 16, extracting the left core 15 from the product. During demolding, the ejector plate 24 moves upward under external power, driving the ejector pin 25 to push the molded product out of the lower molding cavity 7 of the moving mold insert 5, completing the demolding process. Afterward, the ejector plate 24 resets, preparing for the next injection molding.

[0049] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model.

[0050] Although this document frequently uses terms such as fixed mold 1, moving mold 2, injection top plate 3, fixed mold insert 4, moving mold insert 5, upper molding cavity 6, lower molding cavity 7, middle core 8, left core 9, right core 10, ejector demolding component 11, middle core 12, chuck 13, left core connecting slide 14, left core 15, left limiting rail 16, right core connecting slide 17, right core 18, right core middle sleeve 19, right core sleeve 20, right limiting rail 21, inclined guide post 22, positioning guide post 23, ejector plate 24, ejector pin 25, bottom pin plate 26, bottom plate 27, mold foot 28, and plastic valve product 100, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. An injection mold for an agricultural irrigation plastic valve, comprising a fixed mold (1) and a moving mold (2), characterized in that, The fixed mold (1) is provided with an injection top plate (3), the fixed mold (1) is provided with a fixed mold insert (4), the moving mold (2) is provided with a moving mold insert (5), the fixed mold insert (4) is provided with a molding upper cavity (6), the moving mold insert (5) is provided with a molding lower cavity (7). When the mold is closed, the molding upper cavity (6) and the molding lower cavity (7) fit together to form a complete cavity. The fixed mold insert (4) and the moving mold insert (5) are provided with a central core component (8), a left core component (9) and a right core component (10). The central core component (8), the left core component (9) and the right core component (10) correspond to the positions of the cavity respectively. The moving mold (2) is provided with an ejector demolding component (11) below it.

2. The injection mold for agricultural irrigation plastic valves according to claim 1, characterized in that, The core component (8) includes two cores (12) disposed between the fixed mold insert (4) and the moving mold insert (5), and the tail of the core (12) is provided with a chuck (13).

3. The injection mold for agricultural irrigation plastic valves according to claim 2, characterized in that, The diameter of the chuck (13) is larger than the diameter of the core (12), and the core (12) extends into the cavity.

4. The injection mold for agricultural irrigation plastic valves according to claim 3, characterized in that, The left core component (9) includes a left core connecting slide (14) disposed between the fixed mold insert (4) and the moving mold insert (5), and the left core connecting slide (14) is provided with a left core (15) extending into the cavity.

5. The injection mold for agricultural irrigation plastic valves according to claim 4, characterized in that, The moving mold (2) is provided with a left limiting track (16), and the left core connecting slide (14) is slidably engaged with the left limiting track (16). The left core connecting slide (14) is driven by a cylinder.

6. The injection mold for agricultural irrigation plastic valves according to claim 5, characterized in that, The right core component (10) includes a right core connecting slide (17) disposed between the fixed mold insert (4) and the moving mold insert (5). The right core connecting slide (17) is provided with a right core (18) that is directly opposite to the left core (15). The right core (18) is fitted with a right core middle sleeve (19) and a right core sleeve (20).

7. The injection mold for agricultural irrigation plastic valves according to claim 6, characterized in that, The moving mold (2) is provided with a right limiting rail (21), and the right core connecting slide (17) is slidably engaged with the right limiting rail (21). The right core connecting slide (17) is driven by a cylinder.

8. The injection mold for agricultural irrigation plastic valves according to claim 6 or 7, characterized in that, The fixed mold (1) is provided with an inclined guide post (22) that engages with the right core connecting slide (17), and a positioning guide post (23) is provided between the fixed mold (1) and the moving mold (2).

9. The injection mold for agricultural irrigation plastic valves according to claim 1, characterized in that, The ejector demolding component (11) includes an ejector plate (24) disposed below the moving mold (2), and the ejector plate (24) is provided with ejector pins (25) extending into the cavity.

10. The injection mold for agricultural irrigation plastic valves according to claim 9, characterized in that, Below the ejector plate (24) are provided a bottom plate (26) and a bottom plate (27), and a mold foot (28) is provided between the bottom plate (27) and the moving mold (2).

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