Die for holding tip mechanism

Abstract

The utility model relates to the field of injection molds, and discloses a mold for keeping a tip mechanism. Comprising a movable mold core provided with a movable mold insert; the fixed mold core is matched with the movable mold core and is provided with a first fixed mold insert; the movable mold core, the movable mold insert, the fixed mold core and the first fixed mold insert are closed to form an injection molding cavity for a needle head body; the injection mold is characterized in that a mounting groove is formed in the fixed mold core, the top of the injection molding cavity and the bottom of the mounting groove are located on the same plane and are inclined, a second fixed mold insert is arranged in the mounting groove, one end of the second fixed mold insert is provided with an inclined end face matched with the bottom of the mounting groove, and the inclined end face is pressed on the top of the injection molding cavity. Therefore, the sharpness of the head of the needle body is kept, and the production quality and the use effect of the needle body are improved.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a mold for retaining a pointed head mechanism. Background Art

[0002] In medical practice, the sharpness of the needle is crucial to the puncture effect and patient comfort. Typically, medical needles need to pierce bottle corks, skin, or other tissues. If the needle is not sharp enough, it will not only increase the difficulty and pain of the puncture, but may also affect the smooth injection or extraction of the liquid medicine. At present, conventional medical needle production processes mostly use injection molding technology. However, in the actual production process, the glue is not fully injected into the needle head, resulting in the needle head after molding not being sharp enough, which brings inconvenience to medical operations and also affects the medical effect.

[0003] To overcome this problem, existing technical solutions have proposed improving needle tip sharpness by optimizing the injection mold structure and process parameters. For example, these methods include adding flow channels to the mold and modifying the fluidity of the injection material. However, these measures still have certain limitations in practical application and cannot completely solve the problem of insufficiently sharp needle tips. Therefore, a new technical solution is urgently needed to fundamentally improve the sharpness of medical needles by improving the mold structure. Utility Model Content

[0004] The purpose of the utility model is to provide a mold for retaining a pointed mechanism to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A mold for holding a pointed mechanism, comprising:

[0007] A movable mold core, on which a movable mold insert is provided;

[0008] A fixed mold core cooperates with the movable mold core and is provided with a first fixed mold insert;

[0009] The movable mold core, the movable mold insert, the fixed mold core and the first fixed mold insert are combined to form an injection molding cavity for the needle body;

[0010] A mounting groove is provided in the fixed mold core, the top of the injection cavity and the bottom of the mounting groove are in the same plane and are inclined, a second fixed mold insert is provided in the mounting groove, and one end of the second fixed mold insert is provided with an inclined end surface adapted to the bottom of the mounting groove, and the inclined end surface is pressed against the top of the injection cavity to maintain the sharpness of the needle body head.

[0011] As a preferred solution of the present invention, a support member is vertically provided in the movable mold core, and the support member extends out of the movable mold core, passes through the injection cavity and extends into the second fixed mold insert.

[0012] As a preferred solution of the present invention, a hole is provided in the second fixed mold insert to cooperate with the tip of the support member.

[0013] As a preferred solution of the present invention, the tip of the support member is used to support the molding of the needle body head.

[0014] As a preferred solution of the present invention, a positioning block is provided in the movable mold core, which cooperates with the support member and is used to assist the support member in being vertical.

[0015] As a preferred solution of the present invention, the angle between the top of the injection cavity and the bottom of the mounting groove and the oblique end surface which are in the same plane is 60°-65°.

[0016] As a preferred solution of the present invention, the movable mold core and the movable mold insert are used to shape the interior and bottom of the injection cavity respectively.

[0017] As a preferred solution of the present invention, the fixed mold core and the first fixed mold insert are used to form the upper end portion and the lower side portion of the injection cavity respectively.

[0018] The utility model has the following beneficial effects: by forming a second fixed mold insert in the mold structure according to the shape of the needle body head, the needle body head is kept sharp, thereby improving the production quality and performance of the needle body. Furthermore, the method of using the second fixed mold insert is simple and easy, requiring no major modification of existing injection molding equipment, and only requiring the design and installation of the corresponding contoured insert, which is highly operable and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the structure of a fixed mold core used for forming the head of a needle body in the prior art of the present utility model.

[0021] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0022] Figure 3It is an enlarged structural diagram of the injection molding cavity of the present invention.

[0023] Figure 4 This is a schematic structural diagram of the injection-molded needle body of the present invention.

[0024] Description of reference numerals:

[0025] 1. Fixed mold core; 11. Needle head; 12. Cavity; 2. Moving mold core; 21. Moving mold insert; 22. Positioning block; 23. Support member; 231. Tip; 3. Fixed mold core; 31. First fixed mold insert; 32. Second fixed mold insert; 321. Oblique end surface; 322. Channel; 33. Mounting groove; 4. Injection cavity; 41. Top; 42. Lower side; 43. Inner part; 44. Bottom; 45. Upper end; 5. Needle body; 51. Head. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See Figure 1 As shown in the figure, this figure is a schematic diagram of the structure of the fixed mold core 1 used for molding the head of the needle body in the prior art. It only relies on the internal cavity 12 to form the shape of the needle head 11 through injection molding. However, the glue is not fully injected into the needle head 11 during injection molding, resulting in the needle head 11 being not sharp enough after molding, which brings inconvenience to medical operations and also affects the medical effect.

[0028] In order to solve the above problems, this embodiment manufactures a second fixed mold insert 32 on the mold structure according to the shape of the needle body 5 head, thereby achieving the effect of keeping the needle body 5 head sharp, improving the production quality and use effect of the needle body 5.

[0029] Specifically, see Figures 2 to 4 As shown, the present invention provides a mold for retaining a needle tip mechanism, comprising a movable mold core 2, on which is disposed a movable mold insert 21. A stationary mold core 3 cooperates with the movable mold core 2, and a first stationary mold insert 31 is disposed on the stationary mold core 3. The movable mold core 2, movable mold insert 21, stationary mold core 3, and first stationary mold insert 31 combine to form an injection molding cavity 4 for a needle body 5.

[0030] Among them, the movable mold core 2 and the movable mold insert 21 are respectively used to form the interior 43 and the bottom 44 of the injection cavity 4, and the fixed mold core 3 and the first fixed mold insert 31 are respectively used to form the upper end 45 and the lower side 42 of the injection cavity 4, which can ensure the precise matching of various parts of the mold, improve the molding accuracy and quality, and have a reasonable structure, reduce the complexity of the mold, reduce production costs, and facilitate assembly, disassembly and maintenance.

[0031] In addition, a mounting groove 33 is provided in the fixed mold core 3, and the top 41 of the injection cavity 4 and the bottom of the mounting groove 33 are in the same plane and are inclined. A second fixed mold insert 32 is provided in the mounting groove 33, and one end of the second fixed mold insert 32 is provided with an inclined end surface 321 that is adapted to the bottom of the mounting groove 33, and the inclined end surface 321 is pressed on the top 41 of the injection cavity 4 to maintain the sharpness of the head 51 of the needle body 5. By pressing the inclined end surface 321 of the second fixed mold insert 32 on the top 41 of the injection cavity 4, which is similar to the part enclosed by the above-mentioned components to form the injection cavity 4, the shape and sharpness of the head 51 of the needle body 5 can be effectively controlled, thereby improving the puncture performance of the needle. At the same time, the top surface of the head 51 of the needle body 5 is completely covered and pressed by the second fixed mold insert 32, unlike Figure 1 As shown, the injection liquid flows into the cavity through the injection flow channel in the mold core. While the needle head in the prior art is completely formed by the structure of the mold cavity, the inclined surface design in this embodiment can make the injection liquid flow more evenly. The pressure of the second fixed mold insert 32 helps to form a more refined or more consistent design requirement for the head 51 of the needle body 5. In particular, the cooperation between the mounting groove 33 and the second fixed mold insert 32 improves the stability of the mold during the injection molding process and reduces defects caused by mold deformation.

[0032] In order to ensure high molding quality of the head 51 of the needle body 5, a support member 23 is vertically provided in the movable mold core 2. The support member 23 extends out of the movable mold core 2, passes through the injection cavity 4, and extends into the second fixed mold insert 32. That is, a channel 322 is provided in the second fixed mold insert 32 to cooperate with the tip 231 of the support member 23. The tip 231 of the support member 23 can provide a directional support force to support the molding of the head 51 of the needle body 5, thereby ensuring that the head 51 of the needle body 5 is molded more sharply. The injection liquid can be injected between the movable mold insert 21 and the first fixed mold insert 31, that is, into the lower side 42 of the first fixed mold insert 31, or as long as the design is reasonable, the fluid can be injected into the injection cavity 4.

[0033] In addition, a positioning block 22 is provided in the movable mold core 2 to cooperate with the support member 23 and to assist the support member 23 in vertical positioning. The positioning block 22 can effectively ensure the accurate positioning of the support member 23 in the vertical direction, thereby improving the accuracy of the entire molding process and ensuring the yield rate of the product.

[0034] The angle between the top 41 of the injection cavity 4 and the bottom 44 of the mounting groove 33 and the inclined end surface 321 which are in the same plane is 60°-65° to provide a sharpness that matches the head 51 of the needle body 5. The inclination angle can be set according to actual needs or the requirements of different types of needles.

[0035] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mold for holding a pointed mechanism, comprising: A movable mold core, on which a movable mold insert is provided; A fixed mold core cooperates with the movable mold core and is provided with a first fixed mold insert; The movable mold core, the movable mold insert, the fixed mold core and the first fixed mold insert are combined to form an injection molding cavity for the needle body; the characteristics are: A mounting groove is provided in the fixed mold core, the top of the injection cavity and the bottom of the mounting groove are in the same plane and are inclined, a second fixed mold insert is provided in the mounting groove, and one end of the second fixed mold insert is provided with an inclined end surface adapted to the bottom of the mounting groove, and the inclined end surface is pressed against the top of the injection cavity to maintain the sharpness of the needle body head.

2. The mold for retaining the tip mechanism according to claim 1, characterized in that: A support member is vertically arranged in the movable mold core, and the support member extends out of the movable mold core, passes through the injection cavity, and extends into the second fixed mold insert.

3. The mold for holding the tip mechanism according to claim 2, characterized in that: The second fixed mold insert is provided with a channel that matches the tip of the support member.

4. The mold for retaining the tip mechanism according to claim 3, characterized in that: The tip of the support member is used to support the molding of the needle body head.

5. The mold for retaining the tip mechanism according to claim 2, characterized in that: A positioning block is provided in the movable mold core, which cooperates with the support member and is used to assist the support member in being vertical.

6. The mold for retaining the tip mechanism according to claim 1, characterized in that: The angle between the top of the injection cavity and the bottom of the mounting groove and the oblique end surface which are in the same plane is 60°-65°.

7. The mold for retaining the tip mechanism according to claim 1, characterized in that: The movable mold core and the movable mold insert are used for molding the interior and the bottom of the injection cavity respectively.

8. The mold for retaining the tip mechanism according to claim 1, characterized in that: The fixed mold core and the first fixed mold insert are used for forming the upper end portion and the lower side portion of the injection cavity respectively.

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