A medical instrument injection molding mold

Abstract

The utility model belongs to injection mold technical field, concretely is a kind of medical instrument injection molding mold, including fixed mould one, fixed mould two and movable mould one and movable mould two, movable mould one and movable mould two are equipped with stripping mechanism inside;The main part of stripping mechanism is ejector rod, is equipped with the through hole inside in movable mould two, the inside of ejector rod is equipped with electric telescopic device, the movable end of electric telescopic device is fixed with top die group;The inside of ejector rod is equipped with through hole, and top die group and the end surface of ejector rod have two working conditions of sealing and separation.The utility model can form double-zone top die operation to needle cylinder after injection molding operation, to avoid the force of top die concentrated in flange one end and lead to the deformation of another end under pressure, simultaneously, double-zone top die can also form the passage communicated with outside in needle cylinder, avoid the negative pressure increase resistance when top die, thus further prevent stripping deformation problem.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and in particular relates to an injection molding mold for medical devices. Background Technology

[0002] Injection molding is a method of shaping industrial products. Products are usually made using rubber injection molding and plastic injection molding. In combination with injection molding machines, thermoplastic or thermosetting materials are made into plastic products of various shapes using plastic molds. In the field of medical device manufacturing, plastic parts such as syringe tubes, needle caps, urine test tubes, and stool test containers are usually mass-produced using injection molding.

[0003] Currently, when medical devices such as syringes and needles are ejected from the injection mold, the moving mold moves in conjunction with the ejector pins to push the product out. However, the thrust only acts on the flange end of the syringe, while the other end of the syringe is in a free state. At the moment of ejection, the core and the inner wall of the syringe form a negative pressure zone, generating additional adsorption force (especially at the free end). The free end is more difficult to detach, causing the syringe to deform.

[0004] To address the aforementioned issues, this application proposes a medical device injection molding die. Utility Model Content

[0005] The purpose of this invention is to provide a medical device injection molding die that solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model is a medical device injection molding mold, including a fixed mold 1, a fixed mold 2, a movable mold 1, and a movable mold 2, wherein the movable mold 1 and the movable mold 2 are provided with a demolding mechanism;

[0008] The main body of the demolding mechanism is a push rod, which passes through the through hole in the movable mold 2. An electric telescopic device is installed inside the push rod, and the movable end of the electric telescopic device is fixed with the top mold assembly.

[0009] The top rod has a through hole inside, and the top module and the end face of the top rod have two working states: sealed and separated.

[0010] Preferably, one end of the push rod is fixed with a transfer plate, adjacent push rods are evenly distributed circumferentially in front of the transfer plate, and a fixed rod connected to the movable mold is fixed behind the transfer plate.

[0011] Preferably, the fixed end of the electric telescopic device is fixedly installed at the front of the movable module.

[0012] Preferably, the main body of the top module at the movable end of the electric telescopic device is a support rod, and an integrally formed convex disc extends outward from the connection point between the support rod and the electric telescopic device.

[0013] Preferably, the rear end face of the convex disc is in contact with the front end face of the push rod.

[0014] Preferably, the rear edge of the cam is provided with a guide slope, and the front end of the top rod is provided with a tapered protrusion.

[0015] Preferably, the guide slope is in a sealed working state when it is in contact with the conical protrusion.

[0016] This utility model has the following beneficial effects:

[0017] This invention uses an electric telescopic device to push out the support rod, combined with the backward movement of the movable mold, to simultaneously generate a pushing force on both ends of the syringe, thereby demolding and unloading it, effectively avoiding the problem of front-end deformation caused by the force being concentrated at the tail end.

[0018] This invention utilizes a separate structure between the cam and the ejector rod, combined with a through hole between the electric telescopic device and the ejector rod, to create an internal airflow channel during the ejection and demolding process of the syringe. This reduces the resistance caused by negative pressure inside the free end of the syringe during ejection and demolding, further preventing syringe deformation and ensuring the quality of the finished product.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the side planar structure of the movable module 2 and movable module 1 of this utility model.

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the combination of movable module 2 and movable module 1 of this utility model;

[0024] Figure 4 This is a schematic diagram of the connection structure between the push rod and the movable mold two of this utility model;

[0025] Figure 5This is a partially enlarged structural diagram of part A of this utility model;

[0026] The attached diagram lists the components represented by each number as follows:

[0027] In the picture:

[0028] 11. Fixed Module 1; 12. Fixed Module 2; 13. Movable Module 1; 14. Movable Module 2;

[0029] 2. Demolding mechanism; 21. Ejector rod; 211. Conical protrusion; 2101. Through hole; 22. Adapter plate; 221. Fixing rod; 23. Electric telescopic device; 231. Support rod; 2311. Thrust plate; 2312. Guide slope. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be understood that the terms "opening", "top and bottom", "thickness", "top", "middle", "length", "inner" and "around" indicate the orientation or positional relationship only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Please see Figure 1-5 As shown, this utility model is a medical device injection molding mold, including a fixed mold 11, a fixed mold 2 12, a movable mold 13, and a movable mold 2 14. The movable mold 13 and the movable mold 2 14 are provided with a demolding mechanism 2.

[0033] The main body of the demolding mechanism 2 is the ejector rod 21, which passes through the through hole in the movable mold 2 14. An electric telescopic device 23 is installed inside the ejector rod 21. The movable end of the electric telescopic device 23 is fixed with a top mold assembly, which is used to apply an ejection force to the end of the syringe that is away from the movable mold 2 14. Combined with the ejection force on the end of the syringe with the flange when the movable mold 2 14 moves forward, a dual-zone top mold unloading effect is formed, which effectively prevents the deformation of the other end caused by the force being concentrated on one end of the flange.

[0034] The ejector pin 21 has a through hole 2101 inside. The ejector assembly and the end face of the ejector pin 21 have two working states: sealing and separation. In the sealing state, the injection molding operation is performed to prevent air from entering the mold. In the separation state, the ejector operation is performed to guide air into the interior and prevent negative pressure from increasing the resistance of the ejector.

[0035] Furthermore, one end of the push rod 21 is fixed with a transition plate 22, which is a circular structure. The through hole 2101 passes through the transition plate 22. Adjacent push rods 21 are evenly distributed in the circumferential direction in front of the transition plate 22. A fixed rod 221 connected to the movable mold 13 is fixed behind the transition plate 22. The fixed end of the electric telescopic device 23 passes through the transition plate 22 and is fixedly installed on the front surface of the movable mold 13.

[0036] Furthermore, the main body of the top module at the movable end of the electric telescopic device 23 is a support rod 231. During the injection molding operation, the support rod 231 is located inside the needle connecting cylinder of the syringe. An integrally formed convex plate 2311 extends outward from the connection between the support rod 231 and the electric telescopic device 23, and its outer wall is flush with the outer wall of the top rod 21.

[0037] Furthermore, the rear end face of the cam 2311 is attached to the front end face of the push rod 21, a guide slope 2312 is provided at the rear edge of the cam 2311, and a conical protrusion 211 is provided at the front end of the push rod 21. The guide slope 2312 and the conical protrusion 211 are in a sealed working state.

[0038] It is understood that this utility model can form a dual-zone ejector operation on the syringe after injection molding, thereby avoiding the force of the ejector being concentrated on one end of the flange, which would cause the other end to be deformed by pressure. At the same time, while performing dual-zone ejector, a channel connecting the syringe to the outside can also be formed inside the syringe, avoiding the generation of negative pressure during ejection and increasing resistance, thereby further preventing demolding deformation problems.

[0039] A specific application of the operation process in this embodiment is as follows: When demolding during injection molding, movable mold 13 and movable mold 24 are first removed. Then, movable mold 24 is driven to move backward independently, while the electric telescopic device 23 drives the support rod 231 to push forward. Thus, the ejection force is applied to both ends of the syringe through the surface of the cam 2311 and movable mold 24. During this period, the front end of the syringe is pushed out by 2112, while the guide slope 2312 separates from the ejector rod 21, thereby connecting the space in the through hole 2101 to the inside of the syringe, thus avoiding the negative pressure from increasing the ejection resistance. Finally, after the syringe is disengaged, the support rod 231 returns to its original position, and the side of the cam 2311 and the conical protrusion 211 fit together to form a seal.

[0040] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A medical device injection molding die, characterized in that: It includes a fixed mold 1 (11), a fixed mold 2 (12), a movable mold 1 (13), and a movable mold 2 (14), wherein the movable mold 1 (13) and the movable mold 2 (14) are provided with a demolding mechanism (2); The main body of the demolding mechanism (2) is a top rod (21), which passes through the through hole in the movable mold (14). An electric telescopic device (23) passes through the inside of the top rod (21), and the movable end of the electric telescopic device (23) is fixed with a top mold assembly. The top rod (21) has a through hole (2101) inside, and the top module and the end face of the top rod (21) have two working states: sealing and separation.

2. The medical device injection mold according to claim 1, characterized in that: One end of the push rod (21) is fixed with a transfer plate (22), and adjacent push rods (21) are evenly distributed in the circumferential direction in front of the transfer plate (22). A fixed rod (221) connected to the movable mold (13) is fixed behind the transfer plate (22).

3. The medical device injection mold according to claim 1, characterized in that: The fixed end of the electric telescopic device (23) is fixedly installed in front of the movable module (13).

4. The medical device injection molding die according to claim 1, characterized in that: The main body of the top module at the movable end of the electric telescopic device (23) is a support rod (231), and an integrally formed convex plate (2311) extends outward from the connection between the support rod (231) and the electric telescopic device (23).

5. The medical device injection mold according to claim 4, characterized in that: The rear end face of the cam (2311) is attached to the front end face of the push rod (21).

6. The medical device injection mold according to claim 5, characterized in that: The rear edge of the cam (2311) is provided with a guide slope (2312), and the front end of the top rod (21) is provided with a conical protrusion (211).

7. The medical device injection mold according to claim 6, characterized in that: When the guide slope (2312) is in contact with the conical protrusion (211), it is in a sealed working state.

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