Hot nozzle cooling structure

Abstract

The utility model relates to a hot nozzle cooling structure which comprises a hot nozzle body, a cooling sleeve and a mold opening sleeve, the cooling sleeve is sleeved on the outer side of the hot nozzle body, the cooling sleeve comprises a cooling groove and two plane parts, the plane parts are arranged on the peripheral side surface of the cooling sleeve, the mold opening sleeve is sleeved on the outer side of the cooling sleeve, and the mold opening sleeve is arranged on the outer side of the cooling groove. Two water delivery ports are formed in the top of the mold opening sleeve, a cooling cavity is formed between the cooling groove and the mold opening sleeve, gaps are formed between the two plane parts and the mold opening sleeve, and the two water delivery ports communicate with the cooling cavity through the two gaps correspondingly; a heat exchange groove is formed in the position, located in the cooling cavity, of the inner side surface of the mold opening sleeve. According to the invention, the hot nozzle pouring gate can be rapidly cooled after mold opening, so that the phenomena of sticking, salivation and yellowing and whitening of a product caused by overheating of the pouring gate are effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a hot nozzle cooling structure. Background Art

[0002] At present, as the precision industry's demand for the precision of injection molding products becomes more and more stringent, hot runner molds, as a high-precision injection mold, are increasingly widely used. Due to the high temperature of the hot runner, after the injection molding is completed, the residual high temperature at the gate will make the overall temperature distribution of the product uneven, and the hot nozzle is prone to sticking and drooling. At the same time, it will also cause defects such as yellowing and whitening of the product, affecting product quality. One solution is to wait for the hot nozzle to fully cool down, but this process takes a long time, which will increase the production time of a single product and reduce overall production efficiency.

[0003] Therefore, after the injection molding is completed, the hot nozzle needs to be cooled quickly in order to carry out the next injection molding work. In the prior art, a cold water jacket is usually added to the outside of the hot nozzle, and water is injected into the cold water jacket to cool the hot nozzle. However, this method requires adding a water channel structure to the template and the hot nozzle, which makes the hot nozzle structure more complicated and the processing more cumbersome. At the same time, since the water in the cold water jacket is in a static state, the heat absorption effect is poor, and heat is easily accumulated, which greatly reduces the cooling speed of the hot nozzle and the cooling effect is poor. Utility Model Content

[0004] In view of this, the utility model provides a hot nozzle cooling structure with simple structure and good cooling effect.

[0005] A hot nozzle cooling structure comprises a hot nozzle body, a cooling sleeve and a mold sleeve, wherein the cooling sleeve is sleeved on the outside of the hot nozzle body, the cooling sleeve comprises a cooling groove and two planar portions, the planar portions are arranged on the circumferential surface of the cooling sleeve, the mold sleeve is sleeved on the outside of the cooling sleeve, two water delivery ports are arranged on the top of the mold sleeve, a cooling cavity is formed between the cooling groove and the mold sleeve, gaps are formed between the two planar portions and the mold sleeve, the two water delivery ports are respectively connected to the cooling cavity through the two gaps, and a heat exchange groove is arranged on the inner surface of the mold sleeve at the position of the cooling cavity.

[0006] In the above technical scheme, a flow channel is provided inside the hot nozzle body, and a gate is provided at the bottom for injecting plastic into the cavity of the mold. The cooling sleeve is provided on the hot nozzle body, and the mold opening sleeve is provided on the outside of the cooling sleeve. A cooling groove and two plane parts are provided on the cooling sleeve. The cooling groove is located at the bottom of the cooling groove and is arranged around the peripheral surface of the cooling sleeve. The two plane parts are located above the cooling groove and one end is connected to the cooling groove. After the cooling sleeve is matched with the mold opening sleeve, two vertical gaps are formed between the two plane parts and the mold opening sleeve, and a cooling cavity distributed around the cooling sleeve is formed between the cooling groove and the mold opening sleeve. After the injection molding work is completed, cooling water enters through a water inlet at the top of the mold opening sleeve, and enters into the cooling cavity below from the gap between the plane part corresponding to the water inlet and the mold opening sleeve, thereby cooling the gate of the hot nozzle body. Cooling, after the cooling water fills the cooling cavity, it can be discharged from the gap at the other side plane and the water inlet at the top, so as to transfer the cooling water with heat in time to avoid heat accumulation in the cooling cavity and enhance the cooling effect on the gate. At the same time, it can ensure the circulation of cooling water in the cooling cavity, improve the heat exchange rate with the gate, further improve the cooling effect, speed up the cooling rate of the gate, and prevent glue, drooling and yellowing and whitening of the product caused by overheating of the gate; in addition, a heat exchange groove is provided on the inner surface of the mold sleeve corresponding to the position of the cooling groove. The heat exchange groove can increase the contact area between water and the side wall of the mold sleeve, which is helpful for water to exchange heat with the side wall of the mold sleeve, reduce the water temperature, avoid heat accumulation in the cooling cavity, and at the same time, it can also increase the capacity of the cooling cavity to a certain extent to accommodate more cooling water.

[0007] As an optional technical solution of the present application, a plurality of heat exchange grooves are provided, and the plurality of heat exchange grooves are parallel to each other and distributed at intervals on the inner surface of the mold sleeve.

[0008] In the above technical solution, the heat exchange groove is annular and distributed around the inner surface of the mold sleeve. There are multiple heat exchange grooves and they are distributed in parallel and at intervals to increase the contact area between the cooling water and the inner wall of the mold sleeve, reduce heat accumulation, and expand the capacity of the cooling cavity.

[0009] As an optional technical solution of the present application, the two planar portions are symmetrically arranged on both sides of the mold sleeve, and the two water inlets are respectively located above the two planar portions.

[0010] In the above technical solution, each plane portion is provided with a water inlet, which is located above the plane portion. During injection molding, the hot nozzle is installed on the front mold, and a water channel is provided on the front mold plate. The hot nozzle body is arranged on the route through which the water channel passes. After the mold is opened, the cooling water reaches the top of the mold sleeve from the water channel on one side of the hot nozzle, enters the cooling cavity from one of the water inlets, and is discharged from the other water inlet to the water channel on the other side.

[0011] As an optional technical solution of the present application, the planar portion is formed by cutting the surface of the cooling jacket.

[0012] In the above technical solution, the side surface of the cooling jacket is a cylindrical surface, and the plane portion is a plane formed by vertically cutting off a part of the cylindrical surface. The processing technology is simple and the cost is low.

[0013] As an optional technical solution of the present application, the mold opening sleeve is provided with a mounting hole, the cooling sleeve and the hot nozzle body are arranged in the mounting hole, a ring-shaped mounting groove is opened at the top of the inner side of the mounting hole, and a first sealing ring is provided at the top of the cooling sleeve, and the first sealing ring is arranged in the mounting groove.

[0014] In the above technical solution, the mounting hole is used for inserting the cooling sleeve and the hot nozzle body, and the mounting groove is arranged on the hole wall of the mounting hole, so that a circle of limiting end face is formed at the end of the mounting hole. After the cooling sleeve is inserted into the mold sleeve, the bottom end face of the first sealing ring abuts against the limiting end face formed by the mounting hole and the annular groove, thereby axially limiting the cooling sleeve and completing the installation of the cooling sleeve. The first sealing ring can be used to seal the mold sleeve to ensure that cooling water can only enter the interior of the mold sleeve from the water inlet.

[0015] As an optional technical solution of the present application, the first sealing ring divides the water inlet into two openings, one of which is located on the top surface of the mold sleeve, and the other opening is located on the inner surface of the mounting hole.

[0016] In the above technical solution, the water inlet is arranged at the junction of the mounting hole and the bottom of the mounting groove, so that the water inlet forms a stepped structure. After the cooling sleeve is installed, the side surface of the first sealing ring abuts against the side surface of the water inlet, so that the water inlet forms two openings, one of which is located at the top of the mold sleeve, and the other opening is located on the side wall of the mounting hole. The cooling water enters and exits the mold sleeve through the two openings to ensure that the cooling water moves along a preset route.

[0017] As an optional technical solution of the present application, a limiting groove is provided on the side wall of the installation groove, and a protruding limiting block is provided on the side of the first sealing ring, and the limiting block is installed in the limiting groove.

[0018] In the above technical solution, when the cooling sleeve and the mold sleeve are installed, the limit block is arranged in the limit groove to prevent the cooling sleeve from rotating relative to the mold sleeve, ensuring that the positions of the plane parts of the water supply port correspond, that is, the water supply port is always located above the plane part.

[0019] As an optional technical solution of the present application, a second sealing ring is provided at the bottom of the cooling jacket, and the cooling groove is provided adjacent to the upper side of the second sealing ring.

[0020] In the above technical solution, the side surface of the second sealing ring abuts against the inner side of the mold sleeve to seal the cooling cavity and prevent water leakage.

[0021] As an optional technical solution of the present application, a plurality of connection holes are provided on the top of the mold sleeve.

[0022] In the above technical solution, the connection hole is used to facilitate the connection between the mold sleeve and the template, and the mold sleeve can be detachably installed on the template through screws and other parts.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] The structure is simple and easy to disassemble and assemble. The present application sets a cooling groove and two flat parts on the cooling sleeve. The cooling water is transported and cooled through the gap between the flat part and the mold sleeve, and the cooling cavity formed by the cooling groove and the mold sleeve. There is no need to open an additional complex water channel structure on the template or the hot nozzle. The overall structure is simple and easy to produce and process. At the same time, the present application is a structure composed of inner and outer sleeves in sequence, which simplifies the steps of installation and disassembly and makes disassembly and assembly more convenient.

[0025] The cooling speed is fast and the cooling effect is good. In the present application, the cooling water enters and exits the cooling cavity through the two water inlets on the top of the mold sleeve. After the cooling water exchanges heat with the gate, the cooling water with heat can be transferred away in time to avoid heat accumulation in the cooling cavity and enhance the cooling effect on the gate. At the same time, the circulation of cooling water in the cooling cavity can increase the heat exchange speed with the gate, further improve the cooling effect, speed up the cooling speed of the gate, and prevent glue, drooling and yellowing and whitening of the product caused by overheating of the gate; in addition, a heat exchange groove is provided on the inner surface of the mold sleeve corresponding to the position of the cooling groove. The heat exchange groove can increase the contact area between water and the side wall of the mold sleeve, which is helpful for water to exchange heat with the side wall of the mold sleeve, reduce the water temperature, avoid heat accumulation in the cooling cavity, and at the same time, it can also increase the capacity of the cooling cavity to a certain extent to accommodate more cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A three-dimensional diagram of a hot nozzle cooling structure according to an embodiment.

[0028] Figure 2 for Figure 1 Exploded view of.

[0029] Figure 3 for Figure 2 Enlarged view of position A in the middle.

[0030] Figure 4 for Figure 2 Enlarged view of position B in the middle.

[0031] Figure 5 This is a top view of the hot nozzle cooling structure of this application.

[0032] Figure 6 for Figure 5 Section view at the AA position.

[0033] Figure 7 This is a schematic diagram of the hot nozzle cooling structure and the structure after the template is installed in this application.

[0034] Description of reference numerals in the figures:

[0035] 1-hot nozzle body; 2-cooling sleeve; 21-cooling groove; 211-cooling cavity; 22-plane part; 221-gap; 23-first sealing ring; 231-limiting block; 24-second sealing ring; 3-mold sleeve; 31-water inlet; 32-heat exchange groove; 33-mounting hole; 34-mounting groove; 35-limiting groove; 36-connecting hole; 4-template. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] Please refer to Figures 1 to 7In a preferred embodiment of the present application, a hot nozzle cooling structure is provided, which is used to cool the hot nozzle when the mold is opened after injection molding. The structure includes a hot nozzle body 1, a cooling sleeve 2 and a mold opening sleeve 3. The cooling sleeve 2 is sleeved on the outer side of the hot nozzle body 1. The cooling sleeve 2 includes a cooling groove 21 and two plane portions 22. The plane portion 22 is arranged on the circumferential surface of the cooling sleeve 2. The mold opening sleeve 3 is sleeved on the outer side of the cooling sleeve 2. Two water delivery ports 31 are provided on the top of the mold opening sleeve 3. A cooling cavity 211 is formed between the cooling groove 21 and the mold opening sleeve 3. A gap 221 is formed between the two plane portions 22 and the mold opening sleeve 3. The two water delivery ports 31 are respectively connected to the cooling cavity 211 through the two gaps 221. A heat exchange groove 32 is provided on the inner surface of the mold opening sleeve 3 at the position of the cooling cavity 211.

[0040] The hot nozzle body 1 is provided with a flow channel ( Figure 6 The specific structure inside the hot nozzle body 1 is not shown in the figure, which is only used for illustration). A gate is provided at the bottom. The molten plastic is injected into the mold cavity from the gate after passing through the runner. After the injection molding is completed, due to the overheating of the gate, it is easy to cause stickiness and drooling, and even cause the product to appear yellow or white. The cooling structure set in the present application can quickly cool the gate of the hot nozzle after the mold is opened. It includes a hot nozzle body 1, a cooling sleeve 2 and a mold opening sleeve 3 arranged inside and outside in sequence. The cooling sleeve 2 is provided with a cooling groove 21 and two flat parts 22. The cooling groove 21 is located at the bottom of the cooling groove 21 and is arranged around the peripheral surface of the cooling sleeve 2. The two plane parts 22 are located above the cooling groove 21 and one end is connected to the cooling groove 21. After the cooling sleeve 2 is matched with the mold sleeve 3, two vertical gaps 221 are formed between the two plane parts 22 and the mold sleeve 3. A cooling cavity 211 distributed around the cooling sleeve 2 is formed between the cooling groove 21 and the mold sleeve 3. After the injection molding work is completed, the cooling water enters through a water inlet 31 at the top of the mold sleeve 3 and is discharged from the water inlet. The gap 221 between the plane part 22 corresponding to 31 and the mold sleeve 3 enters the cooling cavity 211 below, thereby cooling the gate of the hot nozzle body 1. After the cooling water fills the cooling cavity 211, it can be discharged from the gap 221 at the other side plane part 22 and the water delivery port 31 at the top, so that the cooling water with heat is transferred away in time to avoid heat accumulation in the cooling cavity 211, thereby enhancing the cooling effect on the gate. At the same time, it can ensure the circulation of cooling water in the cooling cavity 211, improve the heat at the gate. The heat exchange rate can be increased to further improve the cooling effect, speed up the cooling rate of the gate, and prevent the phenomenon of glue, drooling and yellowing and whitening of the product caused by overheating of the gate; in addition, a heat exchange groove 32 is provided on the inner surface of the mold sleeve 3 corresponding to the position of the cooling groove 21. The heat exchange groove 32 can increase the contact area between water and the side wall of the mold sleeve 3, which is helpful for the heat exchange between water and the side wall of the mold sleeve 3, thereby reducing the water temperature and avoiding the accumulation of heat in the cooling cavity 211. At the same time, it can also increase the capacity of the cooling cavity 211 to a certain extent to accommodate more cooling water.

[0041] Please refer to Figure 6 In the present embodiment, a plurality of heat exchange grooves 32 are provided, and the heat exchange grooves 32 are annular. The plurality of heat exchange grooves 32 are parallel to each other and are spaced apart on the surface of the inner side of the mold sleeve 3. Specifically, the heat exchange grooves 32 are only provided on the surface opposite to the cooling grooves 21. The provision of the heat exchange grooves 32 can increase the contact area between the cooling water and the inner wall of the mold sleeve 3, which helps the cooling water to transfer the heat through contact conduction, thereby reducing heat accumulation. At the same time, the capacity of the cooling cavity 211 can be expanded to accommodate more cooling water and improve the heat exchange effect.

[0042] Please refer to Figure 2 and Figure 6 In this embodiment, the two plane parts 22 are symmetrically arranged on both sides of the mold sleeve 3, and the two water delivery ports 31 are respectively located above the two plane parts 22. Each plane part 22 is correspondingly provided with a water delivery port 31, and the water delivery port 31 is located above the plane part 22. During injection molding, the hot nozzle is installed on the front mold template 4. Figure 7 As shown, a water channel is provided inside the template 4, and the hot nozzle is arranged on the route through which the water channel passes. After the mold is opened, the cooling water reaches the top of the mold sleeve 3 from the water channel on one side of the hot nozzle, and enters the cooling cavity 211 from one of the water inlets 31, and then is discharged from the other water inlet 31 to the water channel on the other side of the hot nozzle.

[0043] Please refer to Figure 2 and Figure 6 In this embodiment, the side surface of the cooling sleeve 2 is a cylindrical surface, and the plane portion 22 is a plane formed by vertically cutting off a part of the cylindrical surface. The distance from the plane portion 22 to the central axis of the cooling sleeve 2 is smaller than the distance from the remaining part to the central axis. Therefore, when matched with the mold sleeve 3, the plane portion 22 and the inner side of the mold sleeve 3 can form a gap 221 for cooling water to pass through. The method of forming the plane portion 22 by cutting on the surface of the cooling sleeve 2 has a simpler process and lower cost.

[0044] Please refer to Figures 1 to 5 In this embodiment, the mold sleeve 3 is provided with a mounting hole 33, and the cooling sleeve 2 and the hot nozzle body 1 are inserted into the mounting hole 33 after being matched. A circle of annular mounting grooves 34 are opened at the top position of the inner surface of the mounting hole 33, so that a circle of limiting end faces are formed at the end of the mounting hole 33, and a first sealing ring 23 is provided on the top of the cooling sleeve 2. When the hot nozzle body 1 and the cooling sleeve 2 are inserted into the mold sleeve 3, the bottom end face of the first sealing ring 23 abuts against the limiting end face formed by the mounting hole 33 and the annular groove, thereby axially limiting the cooling sleeve 2 and completing the installation of the cooling sleeve 2. The first sealing ring 23 can be used to seal the mold sleeve 3 to ensure that cooling water can only enter the mold sleeve 3 from the water inlet 31.

[0045] Please refer to Figure 3 and Figure 6 In this embodiment, the water delivery port 31 is arranged at the junction of the mounting hole 33 and the bottom of the mounting groove 34 to form a stepped structure. After the cooling sleeve 2 is installed, the side of the first sealing ring 23 abuts against the side of the water delivery port 31, so that the water delivery port 31 forms two openings, one of which is located at the top of the mold sleeve 3, and the other opening is located on the side wall of the mounting hole 33. The cooling water enters and exits the mold sleeve 3 through the two openings to ensure that the cooling water moves along a preset route.

[0046] Please refer to Figure 4 and Figure 5 In this embodiment, a limiting groove 35 is formed on the side wall of the mounting groove 34, and a protruding limiting block 231 is provided on the side of the first sealing ring 23. The limiting block 231 is installed in the limiting groove 35. When the cooling sleeve 2 and the mold sleeve 3 are installed, the limiting block 231 is arranged in the limiting groove 35 to prevent the cooling sleeve 2 from rotating relative to the mold sleeve 3, thereby ensuring that the position of the plane portion 22 of the water delivery port 31 corresponds to that of the plane portion 22, that is, the water delivery port 31 is always located above the plane portion 22.

[0047] Please refer to Figure 2 and Figure 6 In this embodiment, a second sealing ring 24 is provided at the bottom of the cooling sleeve 2, and the cooling groove 21 is adjacent to the upper side of the second sealing ring 24. The side surface of the second sealing ring 24 abuts against the inner side of the mold sleeve 3 to seal the bottom of the cooling cavity 211 to prevent water leakage.

[0048] Please refer to Figures 1 to 5 In this embodiment, a plurality of connection holes 36 are provided on the top of the mold sleeve 3. The connection holes 36 are used to facilitate the connection between the mold sleeve 3 and the template 4 so that the hot nozzle body 1 is connected to the template 4. Figure 7 As shown, in specific use, the mold sleeve 3 can be detachably mounted on the template 4 by means of screws and other parts, so that the hot nozzle is connected to the template 4.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0050] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A hot nozzle cooling structure, comprising a hot nozzle body, characterized in that: It also includes a cooling sleeve and a mold opening sleeve, wherein the cooling sleeve is arranged on the outer side of the hot nozzle body, the cooling sleeve includes a cooling groove and two plane parts, the plane parts are arranged on the peripheral side surface of the cooling sleeve, the mold opening sleeve is arranged on the outer side of the cooling sleeve, two water delivery ports are opened on the top of the mold opening sleeve, a cooling cavity is formed between the cooling groove and the mold opening sleeve, gaps are formed between the two plane parts and the mold opening sleeve, the two water delivery ports are connected to the cooling cavity through the two gaps respectively, and a heat exchange groove is provided on the inner surface of the mold opening sleeve at the position of the cooling cavity.

2. The hot nozzle cooling structure according to claim 1, characterized in that: The heat exchange grooves are provided in plurality, and the plurality of heat exchange grooves are parallel to each other and distributed at intervals on the inner surface of the mold sleeve.

3. The hot nozzle cooling structure according to claim 1, characterized in that: The two plane parts are symmetrically arranged on both sides of the mold opening sleeve, and the two water delivery ports are respectively located above the two plane parts.

4. The hot nozzle cooling structure according to claim 1, characterized in that: The plane portion is formed by cutting the surface of the cooling jacket.

5. The hot nozzle cooling structure according to claim 1, characterized in that: The mold opening sleeve is provided with a mounting hole, the cooling sleeve and the hot nozzle body are arranged in the mounting hole, a ring-shaped mounting groove is opened at the top of the inner side of the mounting hole, a first sealing ring is provided on the top of the cooling sleeve, and the first sealing ring is arranged in the mounting groove.

6. The hot nozzle cooling structure according to claim 5, characterized in that: The first sealing ring divides the water delivery port into two openings, one of which is located on the top surface of the mold sleeve, and the other is located on the inner surface of the mounting hole.

7. The hot nozzle cooling structure according to claim 5, characterized in that: A limiting groove is formed on the side wall of the installation groove, and a protruding limiting block is provided on the side surface of the first sealing ring, and the limiting block is installed in the limiting groove.

8. The hot nozzle cooling structure according to claim 1, characterized in that: A second sealing ring is provided at the bottom of the cooling jacket, and the cooling groove is provided adjacent to the upper side of the second sealing ring.

9. The hot nozzle cooling structure according to claim 1, characterized in that: The top of the mold opening sleeve is provided with a plurality of connection holes.

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