Injection mold for Y-shaped connector

Abstract

The application belongs to the technical field of molds and specifically relates to an injection mold for a Y-shaped connector. The injection mold comprises a faceplate, a fixed mold, a movable mold, a square iron, an inclined guide column, a ejector plate and a hot runner system. The fixed mold and the movable mold form a mold cavity for injection molding the Y-shaped connector. The mold cavity comprises a one-to-one corresponding fixed mold core, a movable mold core, a small cavity and a first sliding block. The first sliding blocks are arranged in multiple columns side by side. The first sliding blocks are connected with the inclined guide column through inclined holes. The first sliding blocks are provided with inclined guide sliding grooves. The movable mold core is connected with the guide sliding grooves through a second sliding block. The mold cavity in the application adopts a side-by-side layout mode. Compared with the traditional circumferential wrapping layout mode, the fan-shaped gap is completely eliminated. The space utilization is significantly improved. Meanwhile, the arrangement of the hot runner system is simplified, and the bending structure, length loss and hot runner pressure loss are reduced.

Description

Technical Field

[0001] This application belongs to the field of mold technology, specifically relating to an injection mold for a Y-type connector. Background Technology

[0002] In the manufacturing process of medical devices such as intravenous catheters, the Y-type connector, as a critical component for achieving precise drug dispensing, directly affects the safety and reliability of clinical use due to its injection molding quality. This type of connector contains three asymmetrical branch structures, and the dimensions of each branch channel must be precisely controlled during molding, which places stringent technical requirements on mold design.

[0003] In existing technologies, a circumferentially surrounding cavity layout is commonly used for injection molding of such complex structures. This approach distributes multiple Y-shaped connector cavities evenly along the radial direction of the mold, and, in conjunction with a central gate design, effectively solves the problem of synchronous filling of asymmetrical branch structures by utilizing the symmetrical flow characteristics of molten plastic. Specifically, the annular arrangement of cavities makes the hot runner system radially distributed, ensuring balanced material inlet pressure in each cavity, avoiding molding defects caused by differences in flow paths, and controlling the positional deviation of the branch structure within a certain range.

[0004] However, with the trend towards miniaturization and precision in medical devices, the shortcomings of existing layout schemes are becoming increasingly apparent. Taking a typical Φ300mm diameter mold as an example, the eight cavities arranged circumferentially only occupy 52% of the effective projected area. The unused fan-shaped interval areas form a large amount of ineffective space, accounting for as much as 48% of the area. This layout method limits the output efficiency per unit area of ​​the mold; under the same equipment tonnage, the molding capacity of a single mold is reduced by about 40% compared to the theoretical maximum.

[0005] While existing technologies have partially solved the molding accuracy problem of asymmetrical structures through circular layouts, their space utilization rate can no longer meet the strategic needs of the medical device industry for efficient and low-cost manufacturing. Therefore, developing novel densely arranged cavity structures that break through traditional layout paradigms has become a key technological direction for improving the injection molding efficiency of Y-type connectors. Utility Model Content

[0006] The purpose of this application is to provide an injection mold for a Y-type connector with a novel densely arranged cavity structure that breaks through the traditional layout paradigm.

[0007] The embodiments of this application can be implemented through the following technical solutions:

[0008] An injection mold for a Y-type connector, the Y-type connector including a main tube, a side tube and a connecting tube, the side tube communicating with the side of the main tube, the connecting tube being coaxial or non-coaxial with the main tube, the injection mold including a face plate, a fixed mold, a moving mold, square iron, inclined guide pillars, an ejector plate and a hot runner system, the fixed mold and the moving mold forming a cavity for injection molding the Y-type connector;

[0009] The cavity includes a fixed mold core, a moving mold core, a small core, and a first slider, which are arranged in multiple rows side by side. The first slider is connected to the inclined guide post through an inclined hole. An inclined guide groove is provided on the first slider. The moving mold core is slidably connected to the guide groove through a second slider.

[0010] Furthermore, the moving mold core includes a first moving mold core and a second moving mold core, wherein the first moving mold core corresponds to the main tube and the second moving mold core corresponds to the side tube;

[0011] The first moving mold core is connected to the output end of the first driving mechanism. The first driving mechanism can drive the first moving mold core to move back along the extension direction of the first moving mold core. The end of the second moving mold core near the first slider is connected to the second slider.

[0012] Furthermore, the first moving mold core and the second moving mold core intersect at an acute angle.

[0013] Furthermore, the connecting tube corresponds to the small core, and the small core is connected to the moving mold through a fixing mechanism.

[0014] Furthermore, the extension direction of the second slider is perpendicular to the extension direction of the second moving mold core.

[0015] Furthermore, the angle between the guide groove and the horizontal plane is complementary to the angle between the side tube and the main tube.

[0016] Furthermore, the ejector plate includes an upper ejector plate, a lower ejector plate, and an ejector pin. The injection molding machine ejector rod is connected to the lower ejector plate, and the upper ejector plate, the lower ejector plate, and the ejector pin move synchronously.

[0017] Furthermore, the fixed mold has guide positioning holes at all four corners of its bottom end, and the moving mold has guide positioning pins corresponding to the guide positioning holes at its top end.

[0018] The injection mold for a Y-type connector provided in the embodiments of this application has at least the following beneficial effects:

[0019] The mold cavity in this application adopts a side-by-side layout, which completely eliminates the fan-shaped gap compared with the traditional circumferential wrapping layout. This significantly improves space utilization and simplifies the layout of the hot runner system, reducing bending structure, length loss and hot runner pressure loss.

[0020] In this application, the extension direction of the second slider is perpendicular to the extension direction of the second moving mold core. On the one hand, the vertically intersecting structure, through the mechanical limiting principle, can effectively avoid component displacement or jamming caused by uneven force during demolding, significantly improving the stability of the connection between the two; on the other hand, the vertical layout provides a more reasonable force transmission path for the inclined guide post drive system. When the inclined guide post drives the first slider to move laterally, the vertically set second slider can accurately convert the movement direction into the extraction direction of the second moving mold core, ensuring the smooth demolding of the branch part of the Y-shaped structure indwelling needle sleeve seat. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of an injection mold for a Y-type connector according to this application;

[0022] Figure 2 This is an exploded view of an injection mold for a Y-type connector according to this application;

[0023] Figure 3 A top view of the hidden portion structure of an existing injection mold with a circumferentially wrapped cavity;

[0024] Figure 4 for Figure 3 A magnified view of a portion of region D in the middle;

[0025] Figure 5 This is a top view of a Y-type connector according to the present application, after the injection mold has concealed part of the structure;

[0026] Figure 6 for Figure 5 A magnified view of a portion of region C in the middle;

[0027] Figure 7 This is an overall structural diagram of one embodiment of a Y-type connector - a dowel sleeve socket.

[0028] Reference numerals: 1. Y-type connector, 11. Main tube, 12. Connecting tube, 13. Side tube, 2. Panel, 3. Fixed mold, 31. Guide positioning hole, 4. Moving mold, 41. Guide positioning post, 5. Square iron, 6. Inclined guide post, 7. Ejector plate, 71. Upper ejector plate, 72. Lower ejector plate, 81. Moving mold core, 811. First moving mold core, 812. Second moving mold core, 82. First slider, 821. Guide groove, 83. Second slider. Detailed Implementation

[0029] The present application will now be further described based on preferred embodiments and with reference to the accompanying drawings.

[0030] The vocabulary used in this specification is for illustrative purposes and is not intended to limit the scope of this application. Unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection via an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of these terms in this application.

[0031] Furthermore, in the description of the embodiments of this application, various components on the drawings have been enlarged or reduced for ease of understanding, but this is not intended to limit the scope of protection of this application.

[0032] The Y-type connector 1 includes a main tube 11, a side tube 13, and a connecting tube 12. The side tube 13 is connected to the side of the main tube 11, and the connecting tube 12 is coaxially or non-coaxially arranged with the main tube 11. To clearly illustrate the technical solutions in this application, as... Figure 4 and Figure 5 As shown, the Y-type connector 1 in this application is illustrated using the specific structure of an indwelling needle cannula seat. The correspondence between the indwelling needle cannula seat and the main tube 11 is as follows: the connecting tube 12 of the indwelling needle cannula seat is coaxially arranged; the puncture needle seat of the indwelling needle cannula seat corresponds to the main tube 11; the Y-shaped joint corresponds to the side tube 13; and the indwelling needle fixing sheath corresponds to the connecting tube 12. The Y-type tee is a Y-type connector structure where the main tube 11 and the connecting tube 12 are not coaxially arranged.

[0033] Figure 1 and Figure 2 The overall structural diagram and exploded view of the injection mold (hereinafter referred to as: injection mold) for the Y-type connector 1 in this application are shown respectively, as follows: Figure 1 and Figure 2 As shown, the injection mold includes a panel 2, a fixed mold 3, a moving mold 4, a square iron 5, an inclined guide post 6, an ejector plate 7, and a hot runner system. The cavity of the injection Y-type connector 1 is formed between the fixed mold 3 and the moving mold 4.

[0034] Panel 2 is located at the front end of the fixed mold 3, providing support and positioning for the hot runner system, ensuring a relatively fixed position between the hot runner system and other parts of the injection mold. The fixed mold 3 and the moving mold 4 together form the mold cavity. The fixed mold 3 is equipped with components such as hot runner nozzles, through which the molten plastic is injected into the cavity. When the mold opens, the moving mold 4 moves synchronously with the molded Y-connector 1, separating it from the fixed mold 3. The square iron 5 connects the fixed mold 3 to the moving mold 4, installed between the base plate of the fixed mold 3 and the base plate of the moving mold 4, serving as support and spacing, and defining the position of the moving mold 4. The distance between the fixed mold 3 and the moving mold 4 forms the movement space of the ejector plate 7; one end of the inclined guide post 6 is fixed on the moving mold 4, and the other end passes through the first slider of the fixed mold 3. When the mold is opened, the inclined guide post 6 cooperates with the inclined hole on the slider, so that the first slider moves laterally, realizing the lateral core pulling or parting action, so that the molded Y-type connector 1 can be demolded smoothly; the injection molding machine ejector pushes the ejector plate 7 and pushes the ejector pin to push the molded Y-type connector 1 out of the mold cavity; the hot runner system is fixed to one side of the fixed mold 3 through the panel 2, and the internal runner transports the plastic melt from the injection molding machine nozzle to the mold cavity.

[0035] Specifically, such as Figure 6 As shown, the cavity includes a fixed mold core, a moving mold core 81, a small core, and a first slider 82. The fixed mold core is used to form the outer surface of the Y-type connector 1, the moving mold core 81 is used to form the inner surface of the Y-type connector 1, and the small core is used to form the local detailed cavities of the Y-type connector 1.

[0036] Furthermore, such as Figure 1 and Figure 2 As shown, the ejector plate 7 includes an upper ejector plate 71, a lower ejector plate 72, and ejector pins. The injection molding machine ejector rod is connected to the lower ejector plate 72, and the upper ejector plate 71, lower ejector plate 72, and ejector pins move synchronously. During demolding, the injection molding machine ejector rod pushes the upper ejector plate 71, lower ejector plate 72, and ejector pins to move, ejecting the molded Y-shaped connector 1 from the moving mold core 81. The first slider 82 simultaneously completes lateral core pulling.

[0037] In some specific embodiments of this application, such as Figure 3 and Figure 4 As shown, since the Y-type connector 1 has a Y-type structure design, in order to adapt to this structural feature, the existing mold cavity adopts a circumferentially wrapped layout. In this layout, the first slider 82 completes the lateral core pulling by directly acting on the moving mold core 81. This annular arrangement of cavities allows the hot runner system to be distributed radially, thereby achieving effective filling of the mold in two directions.

[0038] Specifically, the Y-type connector 1 has two branching directions, requiring injection molding from different angles. The circumferentially wrapped cavity layout can precisely match this structural requirement, allowing the hot runner system to uniformly inject molten material into the mold from multiple directions.

[0039] However, with the trend towards miniaturization and precision in medical devices, the shortcomings of existing layout schemes are becoming increasingly apparent. Taking a typical Φ300mm diameter mold as an example, the eight cavities arranged circumferentially occupy only 52% of the effective projected area. The unused fan-shaped interval areas form a large amount of ineffective space, accounting for as much as 48% of the area. This layout method limits the output efficiency per unit area of ​​the mold; under the same equipment tonnage, the molding capacity of a single mold is reduced by about 40% compared to the theoretical maximum.

[0040] To address the issue of low space utilization in existing cavity layouts, this application adjusts the circumferential wrapping layout.

[0041] like Figure 5 As shown, this application optimizes the cavity layout of a mold by adopting a double-row, straight-line parallel layout. Compared to the traditional layout, the core advantage of this design is the complete elimination of fan-shaped gaps, significantly improving space utilization. Taking a typical Φ300mm diameter mold as an example, when the cavities are arranged in double rows of straight lines, the ineffective fan-shaped areas caused by radial arrangement in a circular layout are avoided by tightly distributing each cavity along two parallel straight lines. This layout not only makes the cavity arrangement more regular and compact, making full use of the internal space of the mold and reducing material waste, but also creates more reasonable spatial conditions for the arrangement of auxiliary mold structures such as hot runner systems and cooling pipes, which helps to improve the overall performance and production efficiency of the mold.

[0042] In addition, this layout simplifies the arrangement of the hot runner system. Specifically, the hot runners can extend in a straight line to each parallel cavity, reducing curved structures, length losses, and flow channel pressure losses.

[0043] Specifically, the number of first sliders 82 corresponds to the number of inclined guide pillars 6. Multiple rows of first sliders 82 are arranged side-by-side, and each slider 82 is connected to the inclined guide pillar 6 via an inclined hole. An inclined guide groove 821 is provided on each first slider 82. This application, through the inclined guide groove 821, can convert the original horizontal pushing direction of the first slider 82 into an inclined movement matching the Y-shaped branches. Through this angle conversion mechanism, even if the mold cavity adopts a straight side-by-side layout, the two branches of the Y-shaped structure can be smoothly extracted along their respective axial directions during demolding, thereby avoiding the generation of fan-shaped gaps in traditional circular layouts.

[0044] Furthermore, such as Figure 6As shown, the moving mold core 81 is slidably connected to the guide groove 821 via the second slider 83. During mold opening, the inclined guide post 6 engages with the inclined hole on the first slider 82, causing the first slider 82 to move laterally. This, in turn, drives the second slider 83 to move along the extension direction of the guide groove 821 via the guide groove 821, thereby causing the moving mold core 81 to disengage from the forming Y-shaped connector 1.

[0045] Furthermore, the moving mold core 81 includes a first moving mold core 811 and a second moving mold core 812. The first moving mold core 811 corresponds to the main tube 11, and the second moving mold core 812 corresponds to the side tube 13. The first moving mold core 811 and the second moving mold core 812 intersect at an acute angle to adapt to the structure of the Y-type connector 1.

[0046] Furthermore, the first moving mold core 811 is connected to the output end of the first driving mechanism, and the first driving mechanism can drive the first moving mold core 811 to move back along the extension direction of the first moving mold core 811.

[0047] In some specific embodiments of this application, the first driving mechanism is a hydraulic cylinder, a pneumatic cylinder, a linear motor, etc. In actual production, a suitable linear reciprocating motion driving mechanism can be selected based on actual needs.

[0048] In some specific embodiments of this application, the small core corresponds to the connecting tube 12, and the small core is connected to the moving mold 4 through a fixing mechanism. Taking the indwelling needle cannula seat as an example, the small core is used to form the cavity for fixing the indwelling needle in the connecting tube 12, and it is connected to the moving mold 4 through a fixing mechanism such as bolts to achieve synchronous movement with the moving mold 4.

[0049] Furthermore, the end of the second moving mold core 812 near the first slider 82 is connected to the second slider 83.

[0050] In some preferred embodiments of this application, the extension direction of the second slider 83 is perpendicular to the extension direction of the second moving mold core 812. On the one hand, the vertically intersecting structure can effectively avoid component displacement or jamming caused by uneven force during demolding through the mechanical limiting principle, significantly improving the stability of the connection between the two; on the other hand, the vertical layout provides a more reasonable force transmission path for the inclined guide post 6 driving system. When the inclined guide post 6 drives the first slider 82 to move laterally, the vertically set second slider 83 can accurately convert the movement direction into the extraction direction of the second moving mold core 812, ensuring that the branch part of the Y-type connector 1 of the Y-type structure is successfully demolded.

[0051] Furthermore, the angle between the guide groove 821 and the horizontal plane is complementary to the angle between the side pipe 13 and the main pipe 11.

[0052] Furthermore, such as Figure 2As shown, the fixed mold 3 has guide positioning holes 31 at each of its four bottom corners, and the moving mold 4 has guide positioning pins 41 corresponding to the guide positioning holes 31 at its top. The guide positioning pins 41 can be precisely inserted into the guide positioning holes 31. Through the tight fit between the two, precise guidance is provided for the mold closing process of the fixed mold 3 and the moving mold 4, effectively preventing the moving mold 4 from shifting or misaligning during movement, ensuring accurate mold closure, and guaranteeing the precision and quality of product molding. During injection molding, the fit between the two can also withstand the lateral pressure generated by the injection of molten plastic into the cavity, preventing relative displacement between the fixed mold 3 and the moving mold 4, maintaining the shape stability of the mold cavity, and avoiding defects such as flash and dimensional deviations in the product caused by mold misalignment.

[0053] In some other specific embodiments of this application, the moving mold core 81 further includes a third moving mold core, which corresponds to the connecting tube 12. This embodiment corresponds to a Y-type connector 1, similar to a Y-type tee.

[0054] The specific embodiments of this application have been described in detail above. For those skilled in the art, several improvements and modifications can be made to this application without departing from the principle of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An injection mold for a Y-type connector, the Y-type connector comprising a main tube, a side tube, and a connecting tube, the side tube communicating with the side of the main tube, the connecting tube being coaxially or non-coaxially arranged with the main tube, the injection mold comprising a face plate, a fixed mold, a moving mold, square iron, inclined guide pillars, an ejector plate, and a hot runner system, wherein the fixed mold and the moving mold form a cavity for injection molding the Y-type connector, characterized in that: The cavity includes a fixed mold core, a moving mold core, a small core, and a first slider, which are arranged in multiple rows side by side. The first slider is connected to the inclined guide post through an inclined hole. An inclined guide groove is provided on the first slider. The moving mold core is slidably connected to the guide groove through a second slider.

2. The injection mold for a Y-type connector according to claim 1, characterized in that: The moving mold core includes a first moving mold core and a second moving mold core, wherein the first moving mold core corresponds to the main tube and the second moving mold core corresponds to the side tube; The first moving mold core is connected to the output end of the first driving mechanism. The first driving mechanism can drive the first moving mold core to move back along the extension direction of the first moving mold core. The end of the second moving mold core near the first slider is connected to the second slider.

3. The injection mold for a Y-type connector according to claim 2, characterized in that: The first moving mold core and the second moving mold core intersect at an acute angle.

4. The injection mold for a Y-type connector according to claim 3, characterized in that: The connecting tube corresponds to the small core, and the small core is connected to the moving mold through a fixing mechanism.

5. The injection mold for a Y-type connector according to claim 3, characterized in that: The extension direction of the second slider is perpendicular to the extension direction of the second moving mold core.

6. The injection mold for a Y-type connector according to claim 5, characterized in that: The angle between the guide groove and the horizontal plane is complementary to the angle between the side tube and the main tube.

7. The injection mold for a Y-type connector according to claim 1, characterized in that: The ejector plate includes an upper ejector plate, a lower ejector plate, and an ejector pin. The injection molding machine ejector rod is connected to the lower ejector plate, and the upper ejector plate, the lower ejector plate, and the ejector pin move synchronously.

8. The injection mold for a Y-type connector according to claim 1, characterized in that: The fixed mold has guide positioning holes at its four bottom corners, and the moving mold has guide positioning pins at its top corresponding to the guide positioning holes.

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