Needle cylinder injection mold core cooling structure

Abstract

The utility model discloses a needle cylinder injection mold core cooling structure which comprises a first mold core, a cooling mold core and a second mold core which are sequentially connected in a matched mode, the cooling mold core comprises a first base, a spray pipe and an insert pin piece, the first base is detachably connected with the insert pin piece, and an installation cavity is formed in the first base. The spray pipe is arranged in the mounting cavity and is detachably connected with the first base, a first outlet is formed in the side wall of the first base, a first inlet is formed in the bottom of the first base and is communicated with the spray pipe, and a cooling medium enters the mounting cavity through the first inlet and flows out of the first outlet, so that the insert pin part is fully cooled; the second base is arranged on the outer side of the first mold core, the second cooling channel is formed in the second base and communicates with the cooling medium, and the second mold core is cooled, so that the needle head part and the connector of the needle cylinder product can be rapidly formed, and the forming quality, the yield and the attractiveness of the product are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a cooling structure for a syringe injection mold core. Background Technology

[0002] A high-pressure injector syringe is a syringe specifically designed for high-pressure injection. It offers greater resistance to high pressure and more precise drug injection. The syringe typically consists of a syringe body and a needle section, with the needle section also including a connector. In related technologies, the syringe is manufactured through injection molding. During the injection molding process, the mold core temperature directly affects the performance and quality of the syringe (such as size, shape, and appearance). Therefore, controlling the mold core temperature during injection molding is crucial. A common approach is to install cooling pipes inside the mold core, circulating a cooling medium through these pipes to cool the mold core. Existing mold cores typically consist of a straight cylindrical section, a tapered end, and a needle insert connected in sequence. The straight cylindrical section is used to form the body of the syringe product, while the tapered end and needle insert are used to form the needle tip. However, due to the relatively small size of the tapered end and needle insert, it is difficult to install cooling pipes inside them. This results in poor cooling of the needle tip during the molding process, leading to problems such as cracking, shrinkage, weld lines, and uneven product surface. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a cooling structure for the injection mold core of a syringe, which aims to improve the molding quality of the needle tip of the syringe product.

[0004] This utility model discloses a syringe injection molding core cooling structure, including a first mold core, a cooling mold core, and a second mold core connected in sequence. The first mold core is placed inside the syringe body and is used for molding the syringe body. The cooling mold core is placed inside the needle tip of the syringe. The end of the second mold core is placed inside the needle tip of the syringe and fitted into the cooling mold core. The cooling mold core and the second mold core are used for molding the needle tip. The cooling mold core includes a first base, a nozzle, and a needle insert. The first base and the needle insert are detachably connected. The first base has an installation cavity inside. The nozzle is disposed in the installation cavity and detachably connected to the first base. The side wall of the first base has a first outlet, and the bottom of the first base has a first inlet, which is connected to the nozzle.

[0005] The first base includes a base section and a connecting pipe connected to each other. The base section has a first cavity inside. A first inlet is opened at the end of the base section away from the connecting pipe and is connected to the first cavity. The inner wall of the first cavity is detachably connected to the nozzle. A first outlet is opened on the side wall of the base section. The connecting pipe is connected to the first cavity. The end of the connecting pipe away from the base section is detachably connected to the insert. One end of the nozzle is inserted into the connecting pipe and a preset gap is provided between the nozzle and the inner wall of the connecting pipe.

[0006] Preferably, the first mold core includes: a straight cylindrical section and a tapered end. The straight cylindrical section has a first channel, and the first channel has a cooling pipe. The cooling pipe has a first cooling flow channel. The tapered end is connected to the cooling mold core.

[0007] The conical end includes a first support plate and a first truncated cone. The first support plate is connected to the straight cylindrical section. The first support plate has a first through hole for connecting to a first channel. The base section is located in the first channel. The connecting pipe passes through the first through hole and is connected to the pin insert. The first truncated cone has a first groove. The pin insert is embedded in the first groove. The base section and the pin insert are respectively located on opposite sides of the first support plate. The size of the first through hole is smaller than the size of the base section.

[0008] Specifically, the nozzle includes a connecting section and a nozzle section. The interiors of the connecting section and the nozzle section are connected to form a second flow channel. The second flow channel is connected to the first inlet. The connecting section is detachably connected to the inner wall of the base section. The nozzle section is set inside the connecting pipe, and a preset gap is provided between the nozzle section and the inner wall of the connecting pipe.

[0009] The insert includes a detachable connecting seat and a needle tip. The two ends of the connecting seat are respectively provided with a first connecting groove for connecting the connecting tube and a second connecting groove for connecting the needle tip. The first connecting groove is detachably connected to the connecting tube, and the second connecting groove is detachably connected to the needle tip. The needle tip is placed inside the needle head part of the syringe product and is fitted with the second mold core.

[0010] The second mold core includes: a forming tube and a positioning tube. The forming tube has a second channel inside, and the positioning tube is set inside the second channel. The positioning tube and the forming tube are coaxially arranged. One end of the forming tube is embedded in the needle part of the syringe product, and the needle tip is inserted into one end of the forming tube and fitted with the positioning tube.

[0011] Preferably, the outer side of the end of the formed tube near the insert is also provided with spiral patterns.

[0012] The outer side of the forming tube is provided with a second base, and the inside of the second base is provided with a second cooling channel. The second cooling channel is connected to a cooling medium for cooling the second mold core.

[0013] Specifically, the outer wall of the formed tube is also provided with a positioning boss, which abuts against the lower side of the second base.

[0014] This utility model discloses a syringe injection molding core cooling structure, comprising a first mold core, a cooling mold core, and a second mold core connected in sequence. The cooling mold core includes a first base, a nozzle, and a needle insert. The first base and the needle insert are detachably connected. The first base has an installation cavity inside, and the nozzle is disposed in the installation cavity and detachably connected to the first base. The side wall of the first base has a first outlet, and the bottom of the first base has a first inlet, which is connected to the nozzle. The cooling medium enters the installation cavity through the first inlet and flows out through the first outlet, effectively cooling the needle insert. Furthermore, by setting a second base outside the first mold core, and providing a second cooling channel inside the second base, which is connected to the cooling medium, the second mold core is cooled. This ensures that during the product molding process, the temperature of the needle tip and connector can be continuously transferred to the needle insert and the second mold core, thereby enabling the needle tip and connector of the syringe product to cool and mold quickly, ensuring the molding quality, yield, and aesthetics of the needle tip, especially the connector. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any innovative effort.

[0016] Figure 1 This is an overall structural diagram of the mold core cooling structure disclosed in the embodiments of this utility model;

[0017] Figure 2 This is a cross-sectional view of the mold core cooling structure disclosed in the embodiments of this utility model;

[0018] Figure 3 This is a schematic diagram of the connection structure of the syringe product, the first mold core, the cooling mold core, the second mold core, and the second base disclosed in the embodiments of this utility model;

[0019] Figure 4 The embodiments disclosed herein Figure 3 Enlarged view of the structure of section A;

[0020] Figure 5 This is a schematic diagram of the structure of the syringe product disclosed in the embodiments of this utility model;

[0021] Figure 6 This is a cross-sectional view of the template group disclosed in the embodiments of this utility model;

[0022] Reference numerals:

[0023] 100. Syringe product; 101. Syringe body; 102. Needle tip; 1021. Connector; 600. Template assembly; 601. Lower template assembly; 500. Outer mold assembly; 51. First outer mold assembly; 52. Second outer mold assembly; 200. Mold core cooling structure; 1. First mold core; 11. Straight section; 111. First channel; 12. Conical end; 121. First support plate; 1211. First through hole; 122. First cone; 1221. First groove; 13. Cooling pipe; 131. First cooling channel; 2. Cooling mold. 21. Core; 21. First base; 211. Base section; 2110. First cavity; 212. Connecting pipe; 213. First outlet; 214. First inlet; 22. Nozzle; 221. Connecting section; 222. Nozzle section; 23. Insert pin; 231. Connecting seat; 2311. First connecting groove; 2312. Second connecting groove; 232. Needle tip; 3. Second mold core; 31. Forming tube; 310. Spiral pattern; 311. Positioning boss; 312. Air extraction hole; 32. Positioning tube; 4. Second base; 41. Second cooling channel; Detailed Implementation

[0024] 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, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should also be further understood that the terms "and" and "or" as used in this specification and the appended claims refer to any combination of one or more of the associated listed items and all possible combinations, and include such combinations.

[0028] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

[0029] The present invention discloses a syringe injection mold core cooling structure, such as Figure 1-2 As shown, the device includes a first mold core 1, a cooling mold core 2, and a second mold core 3 connected sequentially from top to bottom along the axial direction. The first mold core 1 is used to form the body 101 of the syringe product 100, and the cooling mold core 2 and the second mold core 3 are used to form the needle tip portion 102 of the syringe product 100. Specifically, the first mold core 1 is placed inside the body 101, the cooling mold core 2 is placed inside the needle tip portion 102, and the end of the second mold core 3 is placed inside the needle tip portion 102 and fitted into the cooling mold core 2 along the axial direction. The first outer mold assembly 51 and the second outer mold assembly 52 are placed outside the syringe product 100. The syringe product 100 is cooled, formed, and demolded through the combined action of the first mold core 1, the cooling mold core 2, and the second mold core 3.

[0030] Specifically, such as Figure 3 As shown, the cooling mold core 2 includes a first base 21, a nozzle 22, and a pin insert 23. The first base 21 and the pin insert 23 are detachably connected. The first base 21 has an internal mounting cavity, and the nozzle 22 is disposed in the mounting cavity and detachably connected to the first base 21 for convenient mold inspection and maintenance. The side wall of the first base 21 has a first outlet 213, and the bottom of the first base 21 has a first inlet 214, which communicates with the interior of the nozzle 22. During operation, the cooling... The cooling medium enters the mounting cavity through the first inlet 214 and the nozzle 22 and reaches the needle insert 23 to cool the needle insert 23. After the cooling medium fills the mounting cavity, it flows out from the first outlet 213. The temperature of the needle insert 23 after being cooled by the cooling medium is lower than that of the needle tip 102 of the syringe product 100. The heat of the needle tip 102 can be continuously transferred to the needle insert 23 for heat exchange, so that the needle tip 102 can be quickly cooled and solidified, thereby reducing the occurrence of defects in the needle tip 102.

[0031] The first base 21 includes a base section 211 and a connecting pipe 212 connected together. The base section 211 has a first cavity 2110 inside. A first inlet 214 is located at the end of the base section 211 away from the connecting pipe 212 and is connected to the first cavity 2110. The inner wall of the first cavity 2110 is detachably connected to the nozzle 22. Specifically, the inner wall of the first cavity 2110 is threadedly connected to the nozzle 22. A first outlet 213 is located on the side wall of the base section 211. The connecting pipe 212 is connected to the first cavity 2110. The first outlet 213 is located at the side wall of the base section 211. The base 21 is detachably connected to the needle insert 23. Specifically, the end of the connecting pipe 212 away from the base section 211 is threadedly connected to the needle insert 23. One end of the nozzle 22 is inserted into the connecting pipe 212 and a preset gap is provided between the nozzle 22 and the inner wall of the connecting pipe 212. In specific implementation, the cooling medium enters the preset gap through the nozzle 22 from the first inlet 214. As the flow rate of the cooling medium increases, the cooling medium flows from the preset gap to the first cavity 2110 and flows out from the first outlet 213, which fully cools the needle insert 23 so that the needle tip 102 is quickly cooled and quickly formed.

[0032] Specifically, the first mold core 1 includes: a straight cylindrical section 11 and a tapered end 12. The straight cylindrical section 11 is provided with a first channel 111, and a cooling pipe 13 is provided in the first channel. The cooling pipe is provided with a first cooling flow channel 131, which is connected to a cooling medium. The cooling pipe 13 works continuously during the molding process to continuously cool the first mold core 1, thereby ensuring sufficient cooling of the product, reducing deformation, and enabling rapid molding of the product. The tapered end 12 is connected to the cooling mold core 2. Specifically, the cooling medium flows into the first channel 111 through the first cooling flow channel 131 and fills the first channel 111, then flows into the first inlet 214 and fills the first cavity 2110, cooling the first mold core 1 and the cooling mold core 2 to achieve continuous cooling of the cylindrical body 101 and the needle part 102.

[0033] The conical end 12 includes a first support plate 121 and a first truncated cone 122. The first support plate 121 is connected to the straight section 11. The first support plate 121 has a first through hole 1211 for connecting to the first channel 111. The base section 211 is located in the first channel 111. The connecting pipe 212 passes through the first through hole 1211 and is connected to the insert pin 23. The first truncated cone 122 has a first groove 1221. The insert pin 23 is embedded in the first groove 1221. The base section 211 and the insert pin 23 are respectively located on opposite sides of the first support plate 121. The size of the first through hole 1211 is smaller than the size of the base section 211 so that the first support plate 121 supports the base section 211.

[0034] Specifically, the nozzle 22 includes a connecting section 221 and a nozzle section 222. The interiors of the connecting section 221 and the nozzle section 222 are connected to form a second flow channel, which is connected to the first inlet 214. The connecting section 221 is detachably connected to the inner wall of the base section 211. In this embodiment, the outer wall of the connecting section 221 is threadedly connected to the inner wall of the base section 211. Specifically, the inner wall of the base section 211 is provided with a first thread, and the outer wall of the connecting section 221 is provided with a second thread that matches the first thread. The threaded connection between the connecting section 221 and the base section 211 enables a detachable connection between the nozzle 22 and the first base 21, facilitating later mold inspection and maintenance. The nozzle section 222 is located inside the connecting pipe 212, and a preset gap is provided between the nozzle section 222 and the inner wall of the connecting pipe 212 to facilitate the flow of cooling medium and fully cool the connecting pipe 211.

[0035] For details, please refer to Figure 4 The insert 23 includes a detachably connected connecting seat 231 and a needle tip 232. The connecting seat 231 has a first connecting groove 2311 for connecting a connecting tube 212 and a second connecting groove 2312 for connecting the needle tip 232 at both ends. The inner wall of the first connecting groove 2311 is detachably connected to the connecting tube 212. In this embodiment, the connecting tube 212 is threadedly connected to the inner wall of the first connecting groove 2311. Specifically, the inner wall of the first connecting groove 2311 has a third thread, and the outer wall of the end of the connecting tube 212 away from the first base 21 has a fourth thread adapted to the third thread, so that the end of the connecting tube 212 away from the first base 21 is threadedly connected to the first connecting groove 2311. The second connecting groove 2312 is detachably connected to the needle tip 232. The needle tip 232 is detachably connected to the second connecting groove 2312. Specifically, one end of the needle tip 232 is threaded to the second connecting groove 2312. By setting the needle tip 232 and the connecting seat 231 to be detachably connected, the needle tip 232 can be quickly replaced to adapt to the injection molding requirements of syringe products of different shapes. The needle tip 232 is placed inside the needle head part 102 of the syringe product 100 and the needle tip 232 is fitted with the second mold core 3. In this embodiment, the first base 21 and the needle insert 23 are made of beryllium copper. Beryllium copper has excellent thermal conductivity and can conduct heat well during the injection molding process. It can conduct heat from the needle head part 102 in a timely manner, so that the needle head part 102 can be formed quickly. At the same time, beryllium copper is easy to cast and process, and can be flexibly cast and processed according to the product shape.

[0036] The second mold core 3 includes a forming tube 31 and a positioning tube 32. The forming tube 31 has a second channel, and the positioning tube 32 is disposed in the second channel and is coaxially disposed with the forming tube 31. One end of the forming tube 31 is embedded in the needle part of the syringe product 100. In this embodiment, the needle part 102 of the syringe product 100 also includes a connector 1021. The positioning tube 32 and the forming tube 31 have a height difference to form the connector 1021. The needle tip 232 is inserted into one end of the forming tube 31 and fits into the positioning tube 32, so that the forming tube 31, the needle tip 232, and the positioning tube 32 are used for forming the connector 1021.

[0037] For details, please refer to Figure 4 The outer side of the end of the forming tube 31 near the insert 23 is also provided with a spiral 310 to form the threaded structure of the inner wall of the connector 1021.

[0038] Specifically, a second base 4 is provided on the outside of the forming tube 31. The forming tube 31 passes through the second base 4. The second base 4 is provided with a second cooling channel 41 inside. The second cooling channel 41 is connected to a cooling medium for cooling the second mold core 3. As the temperature of the second mold core 3 decreases, the heat of the connector 1021 exchanges with the second mold core 3, allowing the connector 1021 to cool and solidify quickly, reducing the defect rate of the connector 1021. In this embodiment, the second base is also made of beryllium copper, which has good thermal conductivity.

[0039] Specifically, the end side wall of the molding tube 31 near the insert pin 23 is also provided with an air extraction hole 312. The second channel inside the positioning tube 32 can also be used for air extraction. The air extraction hole 312, the second channel, and the air extraction device are connected in sequence. The end of the positioning tube 32 away from the insert pin 23 is connected to the lower mold plate group 601. When the injection molding is completed, the movement of the lower mold plate group 601 drives the positioning tube 32 in the second channel to move away from the insert pin 23. The air in the cavity at the needle tip 102 is extracted by the air extraction device through the air extraction hole 312 and the second channel, which reduces the temperature in the cavity and prevents air bubbles from appearing in the needle tip 102, making the needle tip 102 less prone to cracking and improving the product quality of the needle tip 102.

[0040] The outer wall of the forming tube 31 is also provided with a positioning boss 311. The positioning boss 311 abuts against the lower side of the second base 4, and the upper side of the second base 4 abuts against the second outer mold assembly 52. ​​The second base 4 is locked by the second outer mold assembly 52 and the positioning boss 311 to prevent the position of the second base 4 from changing during operation and affecting the cooling of the second mold core 3.

[0041] In a specific embodiment, please refer to Figure 6The core cooling structure 200 of this technology is applied in a syringe injection mold. The core cooling structure 200 is used in conjunction with the outer mold assembly 500 for injection molding of syringe products. The syringe product 100 includes: a syringe body 101 and a needle tip portion 102. The needle tip portion 102 includes a connector 1021. The structure of the syringe product 100 is as follows: Figure 5 As shown, the syringe injection mold includes: a template assembly 600, an outer mold assembly 500 embedded in the template assembly 600, and a core cooling structure 200 disposed in the outer mold assembly 500. A cavity is formed between the core cooling structure 200 and the outer mold assembly 500 for molding the syringe product 100. During injection molding, the core cooling structure 200 is placed inside the syringe product 100, and the outer mold assembly 500 is placed outside the syringe product 100. The outer mold assembly 500 includes a first outer mold assembly 51 and a second outer mold assembly 52. ​​The first outer mold assembly 51 and the second outer mold assembly 52 are stacked and their interiors form a mold cavity, which is used to shape the outer surface contour of the syringe product 100. The core cooling structure 200 includes: a first mold core 1, a cooling mold core 2, and a second mold core 3. The first mold core 1 is placed inside the syringe body 101, the cooling mold core 2 is placed inside the needle tip portion 102, and the second mold core 3 is placed at its end... The part is placed inside the connector 1021. During operation, the cooling medium flows into the first channel 111 through the first cooling channel 131 of the cooling pipe 13 and fills the first channel 111, cooling the first mold core 1. The cooling medium flows into the first inlet 214, enters the mounting cavity through the nozzle 22 and reaches the insert 23, cooling the insert 23. After the cooling medium fills the mounting cavity, it flows out from the first outlet 213. The temperature of the insert 23 after being cooled by the cooling medium is lower than that of the needle tip 102. The heat of the needle tip 102 can be continuously transferred to the insert 23 for heat exchange, so that the needle tip 102 can cool and solidify quickly. The second cooling channel 41 of the second base 4 is connected to the cooling medium, which can cool the second mold core 3 and the needle tip 232. The heat of the connector 1021 exchanges with the second mold core 3, so that the connector 1021 can cool and solidify quickly.

[0042] The present invention discloses a syringe injection mold core cooling structure, comprising a first mold core, a cooling mold core, and a second mold core connected in sequence. The cooling mold core includes a first base, a nozzle, and a needle insert. The first base and the needle insert are detachably connected. The first base has an installation cavity inside, and the nozzle is disposed in the installation cavity and detachably connected to the first base. The side wall of the first base has a first outlet, and the bottom of the first base has a first inlet, which is connected to the nozzle. The cooling medium enters the installation cavity through the first inlet and flows out through the first outlet to fully cool the needle insert. Furthermore, by setting a second base outside the first mold core, and the second base has a second cooling channel inside, which is connected to the cooling medium, the second mold core is cooled. This allows the temperature of the needle tip and connector to be continuously transferred to the needle insert and the second mold core during the product molding process, thereby enabling the needle tip and connector of the syringe product to be molded quickly, ensuring the molding quality, yield, and aesthetics of the needle tip of the syringe product.

[0043] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent modifications or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cooling structure for a syringe injection mold core, characterized in that, The device includes a first mold core, a cooling mold core, and a second mold core that are connected in sequence. The first mold core is placed inside the body of the syringe product and is used to form the body of the syringe. The cooling mold core is placed inside the needle tip of the syringe product. The end of the second mold core is placed inside the needle tip of the syringe product and fitted into the cooling mold core. The cooling mold core and the second mold core are used to form the needle tip. The cooling mold core includes a first base, a nozzle, and a pin insert. The first base and the pin insert are detachably connected. The first base has an installation cavity inside. The nozzle is disposed in the installation cavity and is detachably connected to the first base. The side wall of the first base has a first outlet, and the bottom of the first base has a first inlet, which is connected to the nozzle.

2. The syringe injection mold core cooling structure according to claim 1, characterized in that, The first base includes a base section and a connecting pipe connected to each other. The base section has a first cavity inside. A first inlet is opened at the end of the base section away from the connecting pipe and is connected to the first cavity. The inner wall of the first cavity is detachably connected to the nozzle. A first outlet is opened on the side wall of the base section. The connecting pipe is connected to the first cavity. The end of the connecting pipe away from the base section is detachably connected to the insert. One end of the nozzle is inserted into the connecting pipe and a preset gap is provided between the nozzle and the inner wall of the connecting pipe.

3. The syringe injection mold core cooling structure according to claim 2, characterized in that, The first mold core includes: a straight cylindrical section and a tapered end. The straight cylindrical section has a first channel, a cooling pipe is provided in the first channel, and a first cooling flow channel is provided in the cooling pipe. The tapered end is connected to the cooling mold core.

4. The syringe injection mold core cooling structure according to claim 3, characterized in that, The conical end includes a first support plate and a first truncated cone. The first support plate is connected to the straight section. The first support plate has a first through hole for connecting to a first channel. The base section is located in the first channel. The connecting pipe passes through the first through hole and is connected to the pin insert. The first truncated cone has a first groove. The pin insert is embedded in the first groove. The base section and the pin insert are respectively located on opposite sides of the first support plate. The size of the first through hole is smaller than the size of the base section.

5. The syringe injection mold core cooling structure according to claim 3, characterized in that, The nozzle includes a connecting section and a nozzle section. The interiors of the connecting section and the nozzle section are connected to form a second flow channel. The second flow channel is connected to the first inlet. The connecting section is detachably connected to the inner wall of the base section. The nozzle section is set inside the connecting pipe, and a preset gap is provided between the nozzle section and the inner wall of the connecting pipe.

6. The syringe injection mold core cooling structure according to claim 3, characterized in that, The insert includes a detachable connecting seat and a needle tip. The two ends of the connecting seat are respectively provided with a first connecting groove for connecting a connecting tube and a second connecting groove for connecting the needle tip. The first connecting groove is detachably connected to the connecting tube, and the second connecting groove is detachably connected to the needle tip. The needle tip is placed inside the needle head part of the syringe product and is fitted with the second mold core.

7. The syringe injection mold core cooling structure according to claim 6, characterized in that, The second mold core includes: a forming tube and a positioning tube. The forming tube has a second channel inside, and the positioning tube is set inside the second channel. The positioning tube and the forming tube are coaxially arranged. One end of the forming tube is embedded in the needle part of the syringe product, and the needle tip is inserted into one end of the forming tube and fitted with the positioning tube.

8. The syringe injection mold core cooling structure according to claim 7, characterized in that, The outer side of the end of the formed tube near the insert is also provided with spiral patterns.

9. The syringe injection mold core cooling structure according to claim 4, characterized in that, A second base is provided on the outside of the forming tube, and a second cooling channel is provided inside the second base. The second cooling channel is connected to a cooling medium for cooling the second mold core.

10. The syringe injection mold core cooling structure according to claim 9, characterized in that, The outer wall of the formed tube is also provided with a positioning boss, which abuts against the lower side of the second base.

Images