CN219505345U - Hot nozzle cooling system of injection mold - Google Patents

Abstract

The utility model belongs to the technical field of injection molds, and discloses a hot nozzle cooling system of an injection mold, which is used for cooling a hot nozzle and comprises a hot nozzle insert assembly and a hot runner plate; the hot runner plate is provided with a water inlet pipeline and a water outlet pipeline; the hot nozzle insert assembly is arranged on the hot runner plate, is of a cylindrical structure, and is provided with a cylindrical through hole for accommodating a hot nozzle; the hot nozzle insert assembly is internally provided with a water circulation passage, and the water circulation passage of the hot nozzle insert assembly is respectively communicated with a water inlet pipeline and a water outlet pipeline of the cooling water conveying pipeline. Through the structural design, the cooling of the hot nozzle can be ensured in the mold opening process.

Description

An injection mold hot nozzle cooling system

technical field

The utility model belongs to the technical field of injection molds, in particular to a cooling system for hot nozzles of injection molds.

Background technique

The cooling method of the hot nozzle of the traditional injection mold is to install an insert at the position of the hot nozzle on the parting surface of the fixed template, and set a cooling water circuit inside the insert, and cool the hot nozzle after passing the cooling water. However, for products with complex structures, due to the large undercut amount or undercut area, the fixed mold slider structure is often used for mold opening. However, when the fixed mold slider structure is adopted, the hot nozzle is separated from the fixed mold slider when the mold is opened, so the method of setting a cooling water channel in the insert on the fixed mold cannot be used to cool the hot nozzle, resulting in the temperature of the hot nozzle when the mold is opened. Higher, wire drawing will reduce product quality.

Utility model content

In order to effectively solve the above technical problems, the utility model proposes the following technical solutions:

A hot nozzle cooling system for an injection mold, comprising a hot nozzle insert assembly and a hot runner plate;

The hot runner plate is provided with a water inlet pipeline and a water outlet pipeline;

The hot nozzle insert assembly is arranged on the hot runner plate, the hot nozzle insert assembly has a cylindrical structure, and the hot nozzle insert assembly is provided with a cylindrical through hole for accommodating the hot nozzle;

The hot nozzle insert assembly is provided with a water circulation passage, and the water circulation passage of the hot nozzle insert assembly communicates with the water inlet pipeline and the water outlet pipeline on the hot runner plate respectively.

As a supplement to the technical solution, it also includes a fixed mold bottom plate and a fixed mold slider, the fixed mold bottom plate is arranged on the upper side of the hot runner plate, and the fixed mold bottom plate is fixedly connected with the hot runner plate, and the fixed mold bottom plate and the hot runner plate There are through holes for the hot nozzle to pass through. The fixed mold slider is located on the lower side of the fixed mold bottom plate. When the mold is closed, the upper end surface of the fixed mold slider is against the lower end surface of the hot runner plate. The mold slider is provided with a through hole for the hot nozzle insert assembly to pass through.

As a supplement to the technical solution, the hot nozzle insert assembly includes a hot nozzle outer insert, a hot nozzle inner insert,

The inner insert of the hot nozzle is a cylindrical structure, and a vertical cylindrical through hole for the hot nozzle to pass is opened on the inner insert of the hot nozzle. On the outer wall at the upper end of the inner insert of the hot nozzle There is an inner insert flange integrally formed with the inner insert of the hot nozzle, the inner insert flange is a circular structure, and the inner insert flange is connected with the hot runner plate; the inner insert flange of the hot nozzle A water tank for water circulation is provided on the outer wall of the inner insert. There are two sets of vertical through holes on the flange of the inner insert, which are respectively the first vertical through hole and the second vertical through hole. The two sets of vertical through holes The holes are all in communication with the water tank on the insert in the hot nozzle;

The outer insert of the hot nozzle includes an outer insert connecting part and a tapered part; the outer insert connecting part is a cylindrical structure, and a vertical hole for accommodating the inner insert of the hot nozzle is opened on the outer insert connecting part. Cylindrical through hole, the diameter of the cylindrical through hole of the connection part of the outer insert is the same as the diameter of the inner insert of the hot nozzle, and the outer wall at the upper end of the connection part of the outer insert is provided with the outer wall of the hot nozzle. The outer insert flange of the insert is integrated, and the outer insert flange is a ring-shaped structure; the tapered part is arranged at the lower end of the outer insert connection part, and the tapered part is a tapered structure. There is a tapered through hole in the shape part that fits the tapered structure at the front end of the hot nozzle;

The connecting part of the outer insert is sheathed on the inner insert of the hot nozzle, and the upper end surface of the outer insert flange on the outer insert of the hot nozzle fits the lower end surface of the inner insert flange of the outer insert of the hot nozzle ,

The water tank on the outer wall of the inner insert of the hot nozzle is surrounded by the inner wall of the outer insert of the hot nozzle to form a cooling water circulation channel. The water circulation channel of the hot nozzle insert assembly is composed of the first vertical through hole, the second Two vertical through holes and a water tank on the side wall of the inner insert of the hot nozzle, the water inlet pipeline of the cooling water delivery pipeline in the hot runner plate and the first inner insert flange of the inner insert of the hot nozzle The vertical through hole communicates, and the water outlet pipeline communicates with the second vertical through hole on the inner insert flange of the inner insert of the hot nozzle.

As a supplement to the technical solution, the water groove provided on the outer wall of the inner insert of the hot nozzle includes a first vertical groove, a second vertical groove, and an annular groove;

The annular groove is an annular groove formed around the outer wall of the inner insert of the hot nozzle at the lower part of the outer wall of the inner insert of the hot nozzle, and the first vertical groove and the second vertical groove are the The groove vertically opened on the outer wall of the hot nozzle, the first vertical groove is located on the lower side of the first vertical through hole on the inner insert flange of the inner insert of the hot nozzle, and the first vertical groove and the second vertical groove A vertical through hole communicates, the second vertical groove is located on the lower side of the second vertical through hole on the inner insert flange of the inner insert of the hot nozzle, and the second vertical groove is connected to the second vertical through hole The holes are connected.

As a supplement to the technical solution, the first vertical through hole and the second vertical through hole on the inner insert of the hot nozzle are oppositely arranged on the inner insert of the hot nozzle to open a vertical cylinder for the hot nozzle to pass through on both sides of the through-hole.

As a supplement to the technical solution, it also includes a first sealing ring and a second sealing ring,

The upper end surface of the outer insert flange of the outer insert of the hot nozzle is provided with an annular groove, and the first sealing ring is arranged in the annular groove on the outer insert flange;

The lower end of the inner insert of the hot nozzle abuts against the upper end surface of the tapered part of the outer insert of the hot nozzle, an annular groove is opened on the lower end surface of the inner insert of the hot nozzle, and the second sealing ring is set In the annular groove on the lower end surface of the insert in the hot nozzle.

As a supplement to the technical solution, it also includes a third sealing ring, the upper end surface of the inner insert flange of the inner insert of the hot nozzle is located at the outer circumference of the first vertical through hole and the second vertical through hole Each is provided with an annular groove, and the third sealing ring is provided with two groups, which are respectively arranged in the annular grooves at the outer circumference positions of the first vertical through hole and the second vertical through hole.

As a supplement to the technical solution, the inner insert flange and the outer insert flange are provided with through holes for screws to pass through, and the screws pass through the through holes of the inner insert flange and the outer insert flange It is screwed on the hot runner plate, and the inner insert of the hot nozzle and the outer insert of the hot nozzle are fixed on the hot runner plate.

Beneficial effects: the utility model can cool the hot nozzle in real time through the design of the water circulation passage in the hot nozzle insert assembly, and the hot nozzle insert assembly can move together with the hot nozzle during the mold opening process. In another aspect of the present invention, the cooling effect can be ensured through the structural design of the outer insert of the hot nozzle and the inner insert of the hot nozzle.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the utility model.

Fig. 2 is a schematic cross-sectional structure diagram of the hot nozzle insert assembly of the utility model.

Fig. 3 is a schematic diagram of the three-dimensional structure of the outer insert of the hot nozzle of the present invention.

Fig. 4 is a schematic diagram of the structure of the insert in the hot nozzle of the present invention.

Fig. 5 is a schematic cross-sectional structure diagram of the inner insert of the hot nozzle of the present invention.

Fig. 6 is a schematic diagram of the flow direction of cooling water on the inner insert of the hot nozzle.

In the figure: 1. Hot nozzle insert assembly, 2. Hot runner plate, 3. Water inlet pipe, 4. Water outlet pipe, 5. Fixed mold bottom plate, 6. Fixed mold slider, 7. Hot nozzle outer insert , 8. Inner insert of hot nozzle, 9. Inner insert flange, 10. First vertical through hole, 11. Second vertical through hole, 12. Outer insert connecting part, 13. Tapered part, 14 .Sink, 15. Outer insert flange, 16. First vertical groove, 17. Second vertical groove, 18. Annular groove, 19. First sealing ring, 20. Second sealing ring, 21. Third Sealing ring, 22. hot mouth.

Detailed ways

In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the number of indicated technical features . Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components , unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

As shown in Figures 1 to 6, an injection mold hot nozzle cooling system is used to cool the hot nozzle of the injection mold, so that when the fixed mold slider 6 structure is used, during the mold opening process, the circulating cooling water can Continue to cool the nozzle. Including hot nozzle insert assembly 1, hot runner plate 2;

The hot runner plate 2 is provided with a cooling water delivery pipeline, and the cooling water delivery pipeline includes a water inlet pipeline 3 and a water outlet pipeline 4;

The hot nozzle insert assembly 1 is arranged on the hot runner plate 2, the hot nozzle insert assembly 1 is a cylindrical structure, and a vertical cylindrical through hole is opened on it, and the head of the hot nozzle 22 passes through the heat flow The channel plate 2 is located in the cylindrical through hole of the hot nozzle insert assembly 1 .

A water circulation passage is provided in the hot nozzle insert assembly 1. When the hot nozzle insert assembly 1 is set on the hot runner plate 2, the water circulation passage of the hot nozzle insert assembly 1 is respectively transported with cooling water. The water inlet pipeline 3 and the water outlet pipeline 4 of the pipeline are connected.

When cooling the hot nozzle, the path of water circulation is, firstly, the cooling water is delivered to the water inlet pipe 3 in the hot runner plate 2, and then the water inlet pipe 3 is sent to the water circulation of the hot nozzle insert assembly 1 In the channel, the water circulation channel finally flows into the outlet pipeline 4 to cool the hot nozzle. Through the above structural design, when the movable platen and the fixed platen are opened, because the hot runner plate 2 and the hot nozzle move together, the hot nozzle insert assembly 1 can keep cooling the hot nozzle.

As a preferred technical solution of the present utility model, it also includes a fixed mold bottom plate 5 and a fixed mold slider 6, the fixed mold bottom plate 5 is arranged on the upper side of the hot runner plate 2, and the fixed mold bottom plate 5 is fixedly connected with the hot runner plate 2, Both the fixed mold bottom plate 5 and the hot runner plate 2 are provided with through holes for the hot nozzle to pass through, and the head of the hot nozzle passes through the through hole on the fixed mold bottom plate 5 and the hot runner plate 2 and is located at the hot nozzle inlay. In the cylindrical through hole of the block assembly 1. The fixed mold slider 6 is located on the lower side of the fixed mold bottom plate 5, and the upper end surface of the fixed mold slider 6 is in contact with the lower end surface of the hot runner plate 2 when the mold is closed. The through hole through which the mouth insert assembly 1 passes. During injection molding, the hot nozzle head located in the hot nozzle insert assembly 1 performs injection molding to the cavity located at the lower side of the fixed mold insert assembly. When the mold is opened, the bottom plate 5 of the fixed mold moves upward together with the hot runner plate 2 and the hot nozzle. After the slider 6 of the fixed mold is separated from the hot runner plate 2 by a certain distance, the sliding block 6 of the fixed mold is moved upward by the guide column of the slider. Traction, moving upward together with the fixed mold bottom plate 5 and the hot runner plate 2.

As a preferred technical solution of the present utility model, the hot nozzle insert assembly 1 includes a hot nozzle outer insert 7, a hot nozzle inner insert 8,

The inner insert 8 of the hot nozzle is a cylindrical structure, and a vertical cylindrical through hole for the hot nozzle to pass is opened on the inner insert 8 of the hot nozzle. The upper end of the inner insert 8 of the hot nozzle is The outer wall is provided with an inner insert flange 9 integrally formed with the inner insert 8 of the hot nozzle. The inner insert flange 9 is a circular structure, and the inner insert 8 of the hot nozzle passes through the inner insert flange 9 is connected with the hot runner plate 2,

The outer wall of the hot nozzle inner insert 8 located below the inner insert flange 9 is provided with a water tank 14 for water circulation, and the inner insert flange 9 is provided with two sets of vertical through holes, respectively The first vertical through hole 10 , the second vertical through hole 11 , and the two groups of vertical through holes are all in communication with the water tank 14 on the inner insert 8 of the hot nozzle. Preferably, the water groove 14 is a groove structure opened on the outer wall of the inner insert 8 of the hot nozzle.

The hot nozzle outer insert 7 includes an outer insert connecting portion 12 and a tapered portion 13;

The outer insert connecting portion 12 is a cylindrical structure, and a vertical cylindrical through hole for accommodating the inner insert 8 of the hot nozzle is opened on the outer insert connecting portion 12, and the cylindrical through hole of the outer insert connecting portion 12 The diameter of the shaped through hole is identical with the diameter of the insert 8 in the hot nozzle. An outer insert flange 15 integrally formed with the outer insert 7 of the hot nozzle is provided on the outer side wall at the upper end of the outer insert connecting portion 12 , and the outer insert flange 15 has a ring-shaped structure.

The tapered portion 13 is arranged at the lower end of the connecting portion 12 of the outer insert. The tapered portion 13 has a tapered structure, and a tapered through hole is opened in the tapered portion 13 to fit the tapered structure at the front end of the hot nozzle. .

The outer insert connecting part 12 is sleeved on the inner insert 8 of the hot nozzle, and the upper end surface of the outer insert flange 15 on the outer insert 7 of the hot nozzle is connected with the inner insert flange of the outer insert 7 of the hot nozzle. The lower end surface of 9 fits together.

Since the diameter of the cylindrical through hole offered on the outer insert 7 of the hot nozzle is the same as the diameter of the inner insert 8 of the hot nozzle, the water tank 14 on the outer wall of the inner insert 8 of the hot nozzle is aligned with the inner side of the outer insert 7 of the hot nozzle. The walls are enclosed to form passages for cooling water circulation. The water circulation path of the hot nozzle insert assembly 1 is composed of the first vertical through hole 10, the second vertical through hole 11 and the water tank 14 on the side wall of the hot nozzle inner insert 8. The hot runner plate The water inlet pipeline 3 of the cooling water delivery pipeline in 2 communicates with the first vertical through hole 10 on the inner flange 9 of the inner insert 8 of the hot nozzle, and the outlet pipeline 4 communicates with the inner insert of the hot nozzle The second vertical through hole 11 on the inner insert flange 9 of 8 communicates.

Through the above settings, when cooling the hot nozzle, the water flow path is: firstly, the cooling water is delivered to the water inlet pipe 3 in the hot runner plate 2, and then the first vertical direction of the insert 8 in the hot nozzle The position of the through hole 10 flows into the water tank 14 on the inner insert 8 of the hot nozzle, and flows into the outlet pipe 4 in the hot runner plate 2 from the second vertical through hole 11 of the inner insert 8 of the hot nozzle. cooling.

As a preferred technical solution of the present invention, the water tank 14 provided on the outer wall of the inner insert 8 of the hot nozzle includes a first vertical groove 16, a second vertical groove 17, and an annular groove 18;

The annular groove 18 is an annular groove formed around the outer wall of the inner insert 8 of the hot nozzle around the outer wall of the inner insert 8 of the hot nozzle. The first vertical groove 16 and the second vertical groove 17 are formed in the The groove vertically opened on the outer wall of the inner insert 8 of the hot nozzle, the first vertical groove 16 is located under the first vertical through hole 10 on the inner insert flange 9 of the inner insert 8 of the hot nozzle side, and the first vertical groove 16 communicates with the first vertical through hole 10, and the second vertical groove 17 is located in the second vertical through hole 11 on the inner insert flange 9 of the hot nozzle inner insert 8 and the second vertical groove 17 communicates with the second vertical through hole 11.

Through the above-mentioned structural arrangement, the cooling water first flows into the first vertical groove 16 through the first vertical through hole 10, and then flows down into the annular groove 18 along the first vertical groove 16, and in the second vertical groove 17, it flows upward along the second vertical groove 17, and flows out from the second vertical through hole 11.

As a preferred technical solution of the above-mentioned embodiment, in order to increase the flow path of cooling water on the outer wall of the inner insert 8 of the hot nozzle and improve the cooling efficiency, the first vertical through hole 10 and the second vertical hole 10 on the inner insert 8 of the hot nozzle Two vertical through holes 11 are oppositely arranged on both sides of the vertical cylindrical through hole for the hot nozzle 22 to pass through the hot nozzle inner insert 8, the first vertical through hole 10 and the second vertical through hole 11 through the axis of the cylindrical through hole. The line connecting the first vertical groove 16 and the second vertical groove 17 on the outer wall of the inner insert 8 of the corresponding hot nozzle passes through the axis of the inner insert 8 of the hot nozzle.

As a preferred technical solution of the present utility model, it also includes a first sealing ring 19, a second sealing ring 20,

An annular groove is formed on the upper surface of the outer insert flange 15 of the hot nozzle outer insert 7 , and the first sealing ring 19 is arranged in the annular groove on the outer insert flange 15 . Through the arrangement of the first sealing ring 19 , water leakage between the outer insert flange 15 and the inner insert flange 9 is prevented.

The lower end of the inner insert 8 of the hot nozzle abuts against the upper end surface of the tapered part 13 of the outer insert 7 of the hot nozzle, and an annular groove is opened on the lower end surface of the inner insert 8 of the hot nozzle. The second sealing ring 20 is arranged in the annular groove on the lower end surface of the inner insert 8 of the hot nozzle. Through the arrangement of the second sealing ring 20 , water leakage at the lower end of the outer insert 7 of the hot nozzle is prevented.

As a preferred technical solution of the present utility model, it also includes a third sealing ring 21, on the upper end surface of the inner insert flange 9 of the hot nozzle inner insert 8, located on the first vertical through hole 10, the second vertical An annular groove is provided at the outer circumference of the through hole 11, and the third sealing ring 21 is provided with two groups and is respectively arranged at the outer circumference of the first vertical through hole 10 and the second vertical through hole 11. in the ring groove. The arrangement of the third sealing ring 21 prevents water leakage between the water inlet pipe 3 and the first vertical through hole 10 , and water leakage between the second vertical through hole 11 and the water outlet pipe 4 .

As a preferred technical solution of the present invention, the inner insert flange 9 and the outer insert flange 15 are provided with through holes for screws to pass through, and the screws pass through the inner insert flange 9 and the outer insert flange 9 and the outer insert flange 15. The through hole of the block flange 15 is screwed on the hot runner plate 2 , and the hot nozzle inner insert 8 and the hot nozzle outer insert 7 are fixed on the hot runner plate 2 .

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope of the disclosure of the present invention, according to the present invention Any equivalent replacement or change of the created technical solution and its inventive concept shall be covered within the scope of protection of the present invention.

Claims (8)

1. A hot nozzle cooling system for an injection mold, comprising a hot nozzle insert assembly (1) and a hot runner plate (2); The hot runner plate (2) is provided with a water inlet pipeline (3) and a water outlet pipeline (4); The hot nozzle insert assembly (1) is arranged on the hot runner plate (2), the hot nozzle insert assembly (1) is a cylindrical structure, and the hot nozzle insert assembly (1) is opened for accommodating The cylindrical through hole of hot nozzle (22); The hot nozzle insert assembly (1) is provided with a water circulation passage, and the water circulation passage of the hot nozzle insert assembly (1) is respectively connected to the water inlet pipe (3) and the outlet pipe on the hot runner plate (2). Road (4) is connected. 2. A cooling system for hot nozzles of injection molds according to claim 1, characterized in that it also includes a fixed mold bottom plate (5) and a fixed mold slider (6), and the fixed mold bottom plate (5) is arranged on the heat flow The upper side of the channel plate (2), and the fixed mold bottom plate (5) is fixedly connected with the hot runner plate (2). Both the fixed mold bottom plate (5) and the hot runner plate (2) are provided with a Through the through hole, the fixed mold slider (6) is located on the lower side of the fixed mold bottom plate (5), and the upper end surface of the fixed mold slider (6) is against the lower end surface of the hot runner plate (2) when the mold is closed Rely on, the fixed mold slider (6) is provided with a through hole for the hot nozzle insert assembly (1) to pass through. 3. An injection mold hot nozzle cooling system according to claim 2, characterized in that the hot nozzle insert assembly (1) comprises a hot nozzle outer insert (7), a hot nozzle inner insert (8 ), The hot nozzle inner insert (8) has a cylindrical structure, and a vertical cylindrical through hole for the hot nozzle (22) to pass through is opened on the hot nozzle inner insert (8). An inner insert flange (9) is provided on the outer side wall at the upper end position of the block (8), and the inner insert flange (9) is a ring-shaped structure and the inner insert flange (9) and The hot runner plate (2) is connected; the outer wall of the inner insert (8) of the hot nozzle is provided with a water tank (14) for water circulation, and two sets of vertical The through holes are respectively the first vertical through hole (10) and the second vertical through hole (11), and the two sets of vertical through holes are all connected with the water tank (14) on the inner insert (8) of the hot nozzle ; The outer insert (7) of the hot nozzle includes an outer insert connection part (12) and a tapered part (13); the outer insert connection part (12) is a cylindrical structure, and the outer insert connection part (12) There is a vertical cylindrical through hole for accommodating the inner insert (8) of the hot nozzle, and the diameter of the cylindrical through hole of the outer insert connecting part (12) is the same as that of the inner insert (8) of the hot nozzle. The diameters are the same, and an outer insert flange (15) is provided on the outer wall at the upper end position of the outer insert connecting portion (12), and the outer insert flange (15) is a ring-shaped structure; The tapered part (13) is arranged at the lower end of the outer insert connecting part (12), and the tapered part (13) is a tapered structure, and the tapered part (13) is provided with a tapered Tapered through-holes with matching structure; The outer insert connecting part (12) is sleeved on the inner insert (8) of the hot nozzle, and the upper end surface of the outer insert flange (15) on the outer insert (7) of the hot nozzle is in contact with the outer insert of the hot nozzle. The lower end surface of the inner insert flange (9) of the block (7) fits together, The water tank (14) on the outer wall of the hot nozzle inner insert (8) is surrounded by the inner wall of the hot nozzle outer insert (7) to form a passage for cooling water circulation, and the water circulation passage of the hot nozzle insert assembly (1) It is composed of the first vertical through hole (10), the second vertical through hole (11) and the water groove (14) on the side wall of the inner insert (8) of the hot nozzle. The inside of the hot runner plate (2) The water inlet pipeline (3) communicates with the first vertical through hole (10) on the inner insert flange (9) of the inner insert (8) of the hot nozzle, and the water outlet pipeline (4) communicates with the inner insert flange (9) of the hot nozzle. The second vertical through hole (11) on the inner insert flange (9) of the insert (8) communicates. 4. An injection mold hot nozzle cooling system according to claim 3, characterized in that the water groove (14) opened on the outer wall of the inner insert (8) of the hot nozzle includes a first vertical groove (16) , the second vertical groove (17), the annular groove (18); The annular groove (18) is an annular groove formed around the outer wall of the inner insert (8) of the hot nozzle at the lower part of the outer wall of the inner insert (8) of the hot nozzle. The first vertical groove (16) and The second vertical groove (17) is a groove vertically opened on the outer wall of the inner insert (8) of the hot nozzle, and the first vertical groove (16) is located inside the inner insert (8) of the hot nozzle The lower side of the first vertical through hole (10) on the insert flange (9), and the first vertical groove (16) communicates with the first vertical through hole (10), and the second vertical groove (17) is located on the lower side of the second vertical through hole (11) on the inner insert flange (9) of the inner insert (8) of the hot nozzle, and the second vertical groove (17) is connected with the second vertical The through hole (11) communicates. 5. An injection mold hot nozzle cooling system according to claim 4, characterized in that the first vertical through hole (10) and the second vertical through hole on the inner insert (8) of the hot nozzle (11) are oppositely arranged on both sides of the vertical cylindrical through hole for the hot nozzle (22) to pass through on the inner insert (8) of the hot nozzle. 6. A kind of injection mold hot nozzle cooling system according to claim 3, is characterized in that, also comprises first sealing ring (19), second sealing ring (20), The upper end surface of the outer insert flange (15) of the hot nozzle outer insert (7) is provided with an annular groove, and the first sealing ring (19) is arranged on the outer insert flange (15). in the ring groove; The lower end of the hot nozzle inner insert (8) abuts against the upper end surface of the tapered portion (13) of the hot nozzle outer insert (7), and the lower end surface of the hot nozzle inner insert (8) is opened There is an annular groove, and the second sealing ring (20) is arranged in the annular groove on the lower end surface of the inner insert (8) of the hot nozzle. 7. A cooling system for injection mold hot nozzle according to claim 3, characterized in that it further comprises a third sealing ring (21), and the inner insert flange (9) of the hot nozzle inner insert (8) ) on the upper end surface of the first vertical through hole (10) and the outer circumference of the second vertical through hole (11) are provided with an annular groove, and the third sealing ring (21) is provided with Two groups are arranged respectively in the annular grooves at the outer circumference positions of the first vertical through hole (10) and the second vertical through hole (11). 8. A cooling system for hot nozzles of injection molds according to claim 3, characterized in that, both the inner insert flange (9) and the outer insert flange (15) are provided with holes for screws to pass through. Through holes, the screws pass through the through holes of the inner insert flange (9) and the outer insert flange (15) and are screwed on the hot runner plate (2), and the inner insert (8) and the hot nozzle The insert (7) outside the mouth is fixed on the hot runner plate (2).