Microneedle mold

Abstract

The utility model relates to mould technical field, and disclose a kind of microneedle mould, including lower mould and upper mould, the lower mould is equipped with multiple microneedle mould cavities, the lower mould is inside and located the periphery of the microneedle mould cavity is equipped with multiple rows cooling channel along lower mould length direction arrangement, all the cooling channel between interpenetration, spiral turbulence strip is intervally equipped in the cooling channel, the spiral direction of adjacent two spiral turbulence strips in the same cooling channel is opposite, and impact type flow breaker is equipped in the cooling channel and between two spiral turbulence strips, the agitating direction of adjacent two impact type flow breakers in the same cooling channel is different;The utility model cooling channel intervally arranged spiral turbulence strip and impact type flow breaker form synergistic effect, and spiral turbulence strip is changed rotation direction by the spiral structure of alternate reverse, exacerbates turbulence degree, promotes the full contact of water flow and mould wall surface.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a microneedle mold. Background Technology

[0002] Microneedle molds are generally used to form microneedles. The liquid material for forming microneedles is placed into the mold, and after forming, a solid microneedle is obtained. In the production and manufacturing process of microneedle molds, due to the small size and precise structure of microneedle products, the requirements for cooling efficiency and cooling uniformity after forming are relatively high.

[0003] Existing microneedle molds (such as those with application number 2023207326336) improve molding efficiency after injection molding through the setting of cooling mechanisms, eliminating the need for external equipment to accelerate molding, making operation convenient and facilitating large-scale industrial production. However, these molds use a simple straight-channel design, where cooling water tends to form a laminar flow state within the channel. On the one hand, heat exchange between the water flow and the mold wall is insufficient, and cooling water far from the microneedle mold cavity cannot effectively approach the heat source area, resulting in a low heat transfer rate. On the other hand, the temperature stratification of the cooling water in the laminar flow state is obvious, with hot water near the mold cavity mixing slowly with cold water far from the mold cavity, causing uneven cooling in different areas of the microneedle mold cavity. Utility Model Content

[0004] This invention proposes a microneedle mold to solve the problem that existing cooling water easily forms a laminar flow state in the channel, resulting in low heat exchange efficiency and reduced production efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a microneedle mold, comprising a lower mold and an upper mold, wherein the lower mold is provided with a plurality of microneedle cavities, and multiple rows of cooling channels are provided in the lower mold and located around the microneedle cavities along the length direction of the lower mold, all of the cooling channels being interconnected, and spiral baffles are provided at intervals in the cooling channels, wherein the spiral directions of two adjacent spiral baffles in the same cooling channel are opposite, and an impact agitator is provided in the cooling channel and located between two spiral baffles, wherein the agitation directions of two adjacent impact agitators in the same cooling channel are different.

[0006] Preferably, the impact-type agitator includes a movable rod rotatably disposed within the cooling channel, and an agitator plate is fixed on the movable rod.

[0007] Preferably, there are three spiral baffles and two impact agitators in the same cooling channel, and the agitators on the two impact agitators are arranged at complementary angles.

[0008] Preferably, the two ends of the lower mold are respectively connected to a water inlet pipe and a water outlet pipe, and both the water inlet pipe and the water outlet pipe are connected to the cooling channel.

[0009] Preferably, it further includes a clamping structure, which includes a first protruding plate fixed to the side wall of the lower mold and a second protruding plate fixed to the side wall of the upper mold, wherein a fastening screw is screwed onto the first protruding plate.

[0010] Preferably, the upper end face of the lower mold is provided with a positioning groove near the corner, and the lower end face of the upper mold is correspondingly fixed with a positioning strip.

[0011] Preferably, the lower end face of the upper mold is provided with a sealing gasket.

[0012] Compared with the prior art, this application has the following advantages: The spiral turbulence strips spaced apart in the cooling channel work synergistically with the impact-type agitator. The spiral turbulence strips, through their alternating reverse spiral structure, cause the cooling water to continuously change its rotation direction, intensifying the turbulence and promoting full contact between the water flow and the mold wall. This results in more efficient heat exchange and more uniform cooling in all areas of the micro-needle mold cavity.

[0013] The impact-type agitator breaks the laminar boundary layer with a rotating agitator, creating radial impact disturbances that allow cold and hot water to mix rapidly. This ensures uniform cooling in all areas of the microneedle mold cavity, reduces product deformation and dimensional deviations, and improves the molding accuracy of microneedle products. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0015] Figure 1 This is a cross-sectional view of the lower mold of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a structural diagram showing the lower and upper molds in their separated state; Figure 4 A schematic diagram of the structure of the impact-type agitator and the spiral baffle within the same cooling channel; In the diagram: 1. Lower mold; 2. Upper mold; 21. Sealing gasket; 3. Pressing structure; 31. First convex plate; 32. Second convex plate; 33. Fastening screw; 4. Water inlet pipe; 5. Drain pipe; 6. Microneedle mold cavity; 7. Cooling channel; 8. Impact agitator; 81. Movable rod; 82. Agitator plate; 9. Spiral baffle; 10. Positioning strip; 11. Positioning groove. Detailed Implementation

[0016] 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.

[0017] like Figures 1-4 As shown, a microneedle mold includes a lower mold 1 and an upper mold 2. The upper end face of the lower mold 1 has a positioning groove 11 near a corner. The lower end face of the upper mold 2 is correspondingly fixed with a positioning strip 10. When the lower mold 1 and upper mold 2 are closed, the positioning strip 10 can be embedded into the positioning groove 11, ensuring the accuracy of the mold closing. The lower mold 1 has multiple microneedle cavities 6. The lower end face of the upper mold 2 has a sealing gasket 21. An injection port or injection tube (not shown) is provided on the upper mold 2. The sealing gasket 21 effectively improves the sealing performance during the injection molding process and increases production efficiency. Multiple rows of cooling channels 7 are arranged along the length of the lower mold 1 inside the lower mold 1 and located around the microneedle cavities 6. All cooling channels 7 are interconnected. Water inlet pipes 4 and drain pipes 5 are connected to both ends of the lower mold 1, and both water inlet pipes 4 and drain pipes 5 are interconnected with the cooling channels 7. Spiral baffles 9 are spaced apart within channel 7. These spiral baffles 9 can be made of polytetrafluoroethylene (PTFE) and their spiral angle can be designed to be 30°. They can generate strong rotational motion of the cooling water without significantly increasing flow resistance. The spiral directions of two adjacent spiral baffles 9 are opposite, forming an alternating swirling effect. This causes the cooling water to continuously change its rotation direction during flow, intensifying the turbulence of the water flow. Especially when cooling the outermost microneedle mold cavity 6, the rotation of the cooling water during flow allows the cooling water on the side away from the heat source to be exchanged to the side closer to the heat source, improving the cooling and molding effect. The spiral directions of two adjacent spiral baffles 9 within the same cooling channel 7 are opposite. An impact-type agitator 8 is provided in the cooling channel 7 between two spiral baffles 9. The agitation directions of two adjacent impact-type agitators 8 within the same cooling channel 7 are different.

[0018] Among them, see Figure 1 and Figure 4As shown, the impact-type agitator 8 includes a movable rod 81 rotatably disposed within the cooling channel 7, with a stirring plate 82 fixed on the movable rod 81. In the internal layout of the same cooling channel 7, three spiral baffles 9 and two impact-type agitators 8 form a synergistic water flow control system, and the stirring plates 82 on the two impact-type agitators 8 are set at complementary angles. When the water flow passes through these two sets of agitation structures in sequence, the water flow vortex formed by the first set of stirring plates 82 will be broken by the second set of stirring plates 82 that are tilted in the opposite direction, thereby forming a complex vortex field within the cooling channel 7. Specifically, the impact-type agitator 8 located between the two spiral baffles 9 further enhances the cooling effect. The agitator adopts a structure of two cross-shaped combinations, with four stirring plates 82 symmetrically distributed. The tilting directions of adjacent sets of stirring plates 82 are different, causing the water flow to generate radial impact disturbance when passing through. This impact can break the boundary layer of the inner wall of the channel, promote the mixing of cold and hot water, and make the water temperature distribution within the channel more uniform.

[0019] As described above, in practical use, the lower mold 1 and the upper mold 2 can be closed, and then the material can be injected into the mold cavity. Cooling water can then be introduced through the water inlet pipe 4. Under pressure, the cooling water enters the cooling channel 7, flows along the internal path of the channel, and is finally discharged from the drain pipe 5, forming a complete cooling cycle. When the cooling water flows in the channel, the spiral turbulence strips 9 with alternating spiral directions guide the water flow, forcing the cooling water to continuously change its rotation direction and move forward in an alternating rotation manner. This can significantly increase the contact area and contact time between the water flow and the channel wall, allowing the cooling water to more fully absorb the heat emitted by the material in the mold cavity, thereby effectively improving the cooling and molding speed.

[0020] Furthermore, during the flow of cooling water, the water flow will continuously impact the stirring plate 82 installed in the channel. After being impacted by the water flow, the stirring plate 82 will drive the connected movable rod 81 to rotate, which can further disturb the surrounding water flow, break the laminar flow state that may exist, make the water flow mix more fully, and accelerate the transfer and dissipation of heat.

[0021] See Figure 2 and Figure 3 As shown, it also includes a clamping structure 3, which includes a first protruding plate 31 fixed to the side wall of the lower mold 1 and a second protruding plate 32 fixed to the side wall of the upper mold 2. A fastening screw 33 is screwed onto the first protruding plate 31. After the lower mold 1 and the upper mold 2 are closed, the fastening screw 33 can be rotated to lock the opposing first protruding plate 31 and second protruding plate 32, which can effectively ensure the stability of the lower mold 1 and the upper mold 2 after they are closed.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A microneedle mold, comprising a lower mold (1) and an upper mold (2), wherein the lower mold (1) is provided with a plurality of microneedle cavities (6), characterized in that: Multiple rows of cooling channels (7) are provided inside the lower mold (1) and around the micro-needle cavity (6) along the length of the lower mold (1). All the cooling channels (7) are interconnected. Spiral baffles (9) are provided at intervals in the cooling channels (7). The spiral directions of two adjacent spiral baffles (9) in the same cooling channel (7) are opposite. An impact agitator (8) is provided in the cooling channel (7) between two spiral baffles (9). The agitation directions of two adjacent impact agitators (8) in the same cooling channel (7) are different.

2. The microneedle mold according to claim 1, characterized in that: The impact-type agitator (8) includes a movable rod (81) rotatably disposed in the cooling channel (7), and an agitator plate (82) is fixed on the movable rod (81).

3. A microneedle mold according to claim 2, characterized in that: There are three spiral baffles (9) and two impact agitators (8) in the same cooling channel (7), and the agitators (82) on the two impact agitators (8) are arranged at complementary angles.

4. A microneedle mold according to claim 1, characterized in that: The lower mold (1) is connected to a water inlet pipe (4) and a drain pipe (5) at both ends, and the water inlet pipe (4) and the drain pipe (5) are connected to the cooling channel (7).

5. A microneedle mold according to claim 1, characterized in that: It also includes a clamping structure (3), which includes a first protruding plate (31) fixed to the side wall of the lower mold (1) and a second protruding plate (32) fixed to the side wall of the upper mold (2). The first protruding plate (31) is provided with a fastening screw (33).

6. A microneedle mold according to claim 1, characterized in that: The lower mold (1) has a positioning groove (11) near the corner on its upper end face, and the lower end face of the upper mold (2) is fixed with a positioning strip (10).

7. A microneedle mold according to claim 1, characterized in that: The lower end face of the upper mold (2) is provided with a sealing gasket (21).

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