CN115570760A - Hot nozzle cooling cylinder and injection mold - Google Patents

Abstract

The invention discloses a hot nozzle cooling cylinder and an injection mold, wherein the injection mold is provided with a cooling water path and a mounting hole communicated with the cooling water path, the mounting hole is communicated with a cavity of the injection mold, the hot nozzle cooling cylinder comprises a cylinder body and an end cover, the cylinder body is provided with an assembly hole, two ends of the assembly hole are arranged in a penetrating way, the assembly hole is used for mounting a hot nozzle, the cylinder body is used for being mounted in the mounting hole, and a cooling cavity is formed between the cylinder body and the wall of the mounting hole; the end cover is provided with an installation via hole, the end cover is detachably installed at one end of the barrel body, and the installation via hole is communicated with the assembling hole. The technical scheme of the invention can reduce the production and maintenance cost of the hot nozzle cooling cylinder and improve the practicability.

Description

Hot nozzle cooling cylinder and injection mold

technical field

The invention relates to the field of mold technology, in particular to a hot nozzle cooling cylinder and an injection mold.

Background technique

Injection mold is a mold for plastic injection molding. It usually includes a mold body for forming an injection cavity. The mold body includes a movable mold and a fixed mold. After the movable mold and the fixed mold are closed, an injection cavity is formed inside. Generally, there is a hot nozzle on the fixed mold, and the molten plastic is injected into the cavity through the hot nozzle. In order to avoid the local high temperature of the hot nozzle and the gate from affecting the molding quality of the product, in some injection molds, cooling is installed outside the hot nozzle. cylinder, so that the cooling water channel is formed between the cooling cylinder and the fixed plate, so as to avoid the hot nozzle being too high. However, the cooling cylinder will be worn during use. At present, the cooling cylinder is generally replaced as a whole, and the maintenance cost is high.

Contents of the invention

The main purpose of the present invention is to provide a hot nozzle cooling cylinder, aiming at reducing the production and maintenance costs of the hot nozzle cooling cylinder.

In order to achieve the above object, the hot nozzle cooling cylinder proposed by the present invention is used for an injection mold, and the injection mold is provided with a cooling water channel and an installation hole communicating with the cooling water channel, and the installation hole communicates with the cavity of the injection mold , the hot nozzle cooling cylinder includes:

Cylinder body, the cylinder body is provided with assembly holes, the assembly holes are set through at both ends, the assembly holes are used to install the heating nozzle, the cylinder body is used to be installed in the installation holes, and are connected with the A cooling cavity is formed between the walls of the mounting holes; and

An end cover, the end cover is provided with an installation through hole, the end cover is detachably mounted on one end of the barrel, and the installation through hole communicates with the assembly hole.

Optionally, a plurality of water retaining parts are provided on the outer periphery of the cylinder, and the plurality of water retaining parts extend along the circumference of the cylinder and are distributed at intervals in the circumference of the cylinder. When the cylinder is installed in the installation hole, the water retaining part is used to abut against the hole wall of the installation hole, so that the part between any two adjacent water retaining parts on the cylinder is in contact with the The cooling cavity is formed between the walls of the mounting holes.

Optionally, the radial dimension of the end cap is smaller than the radial dimension of the barrel, and when the barrel is installed in the installation hole, the end cap is used to be in contact with the hole wall of the installation hole. A diversion cavity is formed between any two adjacent cooling cavities by the water retaining part, and a plurality of the cooling cavities are all in communication with the diversion cavity.

Optionally, the end surface of the end cap is formed with an abutment portion and an arc portion, the abutment portion is arranged around the installation via hole, the arc portion is connected to the periphery of the abutment portion, and The abutment portion of the ring is provided.

Optionally, the part between any two adjacent water retaining parts on the cylinder has a first stepped surface and a second stepped surface, and the first stepped surface is located near the end of the second stepped surface. One side of the cover is disposed through the end surface of the barrel, and the second stepped surface is protruding compared to the first stepped surface.

Optionally, the end cap has a connecting portion fitted into the assembly port, the surface of the connecting portion is provided with a first annular groove, the first annular groove is arranged around the connecting portion, and the hot nozzle cooling cylinder A first sealing ring is also included, and the first sealing ring is installed in the first ring groove to seal the gap between the connecting part and the cylindrical body.

Optionally, internal threads are provided in the assembly hole, and external threads that cooperate with the internal threads are provided on the connecting portion to be screwed to the barrel.

Optionally, the barrel includes a barrel body and a fixing flange, one end of the barrel body is detachably connected to the end cover, and the other end is detachably connected to the fixing flange.

The present invention also proposes an injection mold, which includes a mold body, a hot nozzle, and the above-mentioned hot nozzle cooling cylinder. The mold body is provided with a cooling water channel and an installation hole communicating with the cooling water channel. The cavity of the body is connected, the nozzle cooling cylinder is installed in the installation hole, and a cooling cavity is formed between the nozzle cooling cylinder and the hole wall of the installation hole, and the nozzle is installed in the In the assembly hole of the nozzle cooling cylinder.

Optionally, the cooling water circuit includes a water inlet and a water outlet formed on the wall of the installation hole, the water inlet and the water outlet are respectively arranged on opposite sides of the installation hole, and both face the heat sink. The side of the barrel of the nozzle cooling barrel is set.

The technical solution of the present invention detachably connects the cylinder body and the end cap of the hot nozzle cooling cylinder, so that when the end cap is worn or damaged, only the end cap needs to be replaced instead of the entire hot nozzle cooling cylinder, which can reduce the cost of injection molding. Mold maintenance costs. Moreover, the cylinder body and the end cover can be formed separately, and then assembled and fixed. Compared with the integrally formed hot nozzle cooling cylinder, this can reduce the manufacturing difficulty of the hot nozzle cooling cylinder, thereby reducing the production cost of the hot nozzle cooling cylinder and improving practicality.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is a structural schematic diagram of an embodiment of the hot nozzle cooling cylinder of the present invention;

Fig. 2 is an exploded view of the hot nozzle cooling cylinder in Fig. 1;

Fig. 3 is a cross-sectional view of the hot nozzle cooling cylinder and part of the mold body in an embodiment of the injection mold of the present invention;

Fig. 4 is a partial cross-sectional view at A-A in Fig. 3 .

Explanation of reference numbers:

10. Hot nozzle cooling cylinder; 101. Cooling cavity; 102. Guide cavity; 11. Cylinder body; 111. Cylinder body; 112. Fixed flange; 113. Assembly hole; 114. Water retaining part; 115. First step 116, the second step surface; 12, the end cover; 121, the installation hole; 122, the contact part; 123, the arc part; 124, the connection part; 125, the first ring groove; 20, the mold body; 21 , water inlet; 22, water outlet; 23, installation hole.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "and/or" appearing in the whole text includes three parallel schemes, taking "A and/or B as an example", including scheme A, scheme B, or schemes satisfying both A and B. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The invention proposes a hot nozzle cooling cylinder, the hot nozzle cooling cylinder is used for injection mold, the injection mold is provided with a cooling waterway and a mounting hole communicating with the cooling waterway, the mounting hole communicates with the cavity of the injection mold, specifically, the injection mold includes The mold body and hot nozzle, the mold body is provided with cooling channels and installation holes.

In the embodiment of the present invention, as shown in Figures 1 to 4, the hot nozzle cooling cylinder 10 includes a cylinder body 11 and an end cover 12, the cylinder body 11 is provided with an assembly hole 113, and the assembly hole 113 is arranged through two ends, and the assembly The hole 113 is used to install the heating nozzle, the cylinder 11 is used to be installed in the installation hole 23, and forms a cooling cavity 101 with the hole wall of the installation hole 23; the end cover 12 is provided with an installation through hole 121, and the end cover 12 can be It is detachably mounted on one end of the cylinder body 11 , and the mounting hole 121 communicates with the assembly hole 113 .

Specifically, when the hot nozzle cooling cylinder 10 is installed in the installation hole 23, the cylinder body 11 of the hot nozzle cooling cylinder 10 is spaced from the hole wall of the installation hole 23 to form a cooling cavity 101, and the cooling cavity 101 is connected to the mold body 20. The cooling water circuit is connected, and the hot nozzle is installed in the assembly hole 113 of the hot nozzle cooling cylinder 10, and the hot nozzle protrudes from the installation through hole 121 or the plastic in the hot nozzle flows from the installation through hole 121 to the cavity. Therefore, during injection molding, the heat of the hot nozzle can be transferred to the hot nozzle cooling cylinder 10, and when the cooling water flows through the cooling chamber 101, the heat on the hot nozzle cooling cylinder 10 can be taken away, thereby realizing the heat dissipation of the hot nozzle.

The technical solution of the present invention connects the cylinder body 11 and the end cover 12 of the hot nozzle cooling cylinder 10 detachably, so that when the end cover 12 is worn or damaged, only the end cover 12 needs to be replaced, without the need for an integral hot nozzle cooling cylinder 10. This can reduce the maintenance cost of the injection mold. Moreover, the cylinder body 11 and the end cap 12 can be molded separately, and then assembled and fixed. Compared with the integrally formed hot nozzle cooling cylinder 10, the manufacturing difficulty of the hot nozzle cooling cylinder 10 can be reduced, thereby reducing the cost of the hot nozzle cooling cylinder 10. production cost and improve practicality.

In some embodiments, the outer circumference of the cylinder 11 is provided with a plurality of water retaining parts 114, and the plurality of water retaining parts 114 extend along the circumference of the cylinder 11 and are distributed at intervals in the circumference of the cylinder 11, so that the cylinder 11 When installed in the mounting hole 23, the water retaining portion 114 is used to abut against the wall of the mounting hole 23, so that any part between any two adjacent water retaining portions 114 on the cylinder 11 is in contact with the wall of the mounting hole 23. A cooling chamber 101 is formed therebetween. Specifically, when the cylinder body 11 is installed in the installation hole 23 to form multiple cooling cavities 101 , the multiple cooling cavities 101 are all connected to the cooling water channel, that is, the water in the cooling water channel can flow through each cooling cavity 101 and then flow out. Moreover, a diversion cavity 102 is formed between the end cover 12 and the hole wall of the installation hole 23, and any two adjacent cooling cavities 101 are separated by a water retaining part 114, and a plurality of cooling cavities 101 communicate with the diversion cavity 102 .

The cooling water circuit includes a water inlet 21 and a water outlet 22 formed on the wall of the installation hole 23. The water inlet 21 and the water outlet 22 are respectively arranged on opposite sides of the installation hole 23, and are all set towards the side of the cylinder 11, that is, the water inlet 21 Facing one of the cooling chambers 101 , the water outlet 22 faces the other cooling chamber 101 . In this way, when the cooling water enters the corresponding cooling cavity 101 from the water inlet 21, it can flow from the cooling cavity 101 to the guiding cavity 102, and under the action of water pressure, the cooling water in the guiding cavity 102 is distributed into each cooling cavity 101, When it enters the cooling chamber 101 communicated with the water outlet 22 , the water in the cooling chamber 101 can be discharged from the water outlet 22 . Along with the continuous injection of cooling water, under the action of water pressure, the cooling water in the other cooling chambers (the water inlet 21 corresponds to the cooling chamber 101 and the water outlet 22 corresponds to other cooling chambers 101 outside the cooling chamber 101) can continuously communicate with the guide chamber 102 for exchange, and the cooling water can finally flow out from the water outlet 22, which can prevent stagnant water in the cooling chamber 101, thereby continuously causing the heat of the hot nozzle and the hot nozzle cooling cylinder 10, by adjusting the water intake and water flow speed of the cooling water circuit, Heat regulation can be realized to avoid excessive heat and affect product molding quality.

Such arrangement makes each cooled cavity 101 independent of each other, and the water inlet 21 and the water outlet 22 are respectively arranged on opposite sides of the hot nozzle cooling cylinder 10 , and are respectively set towards one cooling cavity 101 . When cooling water is injected through the water inlet 21, the cooling water first enters the cooling chamber 101 corresponding to the water inlet 21, then flows into the diversion chamber 102 from the cooling chamber 101, and finally is diverted by the diversion chamber 102 to the remaining cooling chambers 101 to absorb The heated cooling water flows out from the cooling chamber 101 and the water outlet 22 on the other side. This makes the water flow path between the water inlet 21 and the water outlet 22 longer, increases the residence time of the cooling water at the hot nozzle cooling cylinder 10, allows the cooling water to have enough time to absorb the heat on the hot nozzle, and improves the cooling efficiency. Moreover, this also makes the temperature of the cooling water entering each cooling chamber 101 from the guide chamber 102 relatively close, so that the heat dissipation around the hot nozzle cooling cylinder 10 is relatively uniform, which is beneficial to improving the heat dissipation effect. Optionally, a plurality of water retaining parts 114 are evenly distributed in the circumferential direction of the cylinder 11 , so that the respective cooling chambers 101 are equivalent in size, have a uniform heat dissipation effect, and are convenient for molding.

Of course, in other embodiments, a plurality of cooling chambers 101 can also be connected sequentially in a chain, and the cooling chamber 101 at the first section is communicated with the water inlet 21, and the cooling chamber 101 at the tail end is communicated with the water outlet 22, so that cooling The water flows through all the cooling chambers 101 in sequence and then flows out from the water outlet 22 . Alternatively, a plurality of cooling chambers 101 are communicated end to end, and the two passages of each cooling chamber 101 are staggered. Moisture flows to the water outlet 22 in two ways. In addition, in other embodiments, an annular groove may also be provided on the outer peripheral surface of the cylinder body 11 , and the cooling cavity 101 is formed between the annular groove and the hole wall of the installation hole 23 . Alternatively, the outer peripheral surface of the cylinder body 11 is spaced from the wall of the installation hole 23 to form a cooling cavity 101 .

In some embodiments, six water retaining parts 114 are arranged on the outer circumference of the cylinder 11, and the six water retaining parts 114 are evenly spaced in the circumferential direction of the cylinder 11, that is, the number of cooling chambers 101 is six, so that The contact area between the cylinder body 11 and the wall of the installation hole 23 can be made larger, the installation stability is higher, and the chamber capacity can be made larger, which can accommodate more cooling water and improve the heat dissipation effect. And such a symmetrical arrangement can make the distance between the cooling chamber 101 corresponding to the water inlet 21 and the cooling chamber 101 corresponding to the water outlet 22 longer, so that the water flow path between the water inlet 21 and the water outlet 22 is longer, which increases cooling. The residence time of water at the hot nozzle cooling cylinder 10. Certainly, in other embodiments, the number of water retaining parts 114 may also be 4, or 8, and so on.

In some embodiments, the radial dimension of the end cap 12 is smaller than the radial dimension of the cylinder 11, and the end surface of the end cap 12 is formed with an abutment portion 122 and an arc portion 123, and the abutment portion 122 is arranged around the installation hole 121, The arc portion 123 is connected to the peripheral edge of the abutting portion 122 and is arranged around the abutting portion 122. When the cylinder body 11 is installed in the mounting hole 23, there is a gap between the peripheral side of the end cap 12 and the wall of the mounting hole 23 and The guide cavity 102 is formed between the arc portion 123 and the hole wall of the installation hole 23 . With such arrangement, the size of the guide cavity 102 is relatively large, which can increase the flow rate of the cooling water and improve the heat exchange effect. Of course, in other embodiments, the guide cavity 102 may also be formed only between the peripheral side of the end cover 12 and the hole wall of the installation hole 23 or only jointly formed between the arc portion 123 and the hole wall of the installation hole 23 The diversion chamber 102 .

In some embodiments, the part between any two adjacent water retaining parts 114 on the cylinder body 11 has a first stepped surface 115 and a second stepped surface 116, and the first stepped surface 115 is located near the end of the second stepped surface 116. One side of the cover 12 is disposed through the end surface of the cylinder body 11 , and the second stepped surface 116 protrudes from the first stepped surface 115 . Specifically, when the hot nozzle cooling cylinder 10 is installed in the installation hole 23, the distance between the first stepped surface 115 and the wall of the installation hole 23 is greater than the distance between the second stepped surface 116 and the wall of the installation hole 23, so that the first The space at the stepped surface 115 is larger than the space at the second stepped surface 116 . Both the water inlet 21 and the water outlet 22 are arranged towards the second stepped surface 116. When the cooling water enters the cooling cavity 101 from the water inlet 21 and flows from the second stepped surface 116 to the first stepped surface 115, the water flow can be slowed down and the water The lower the pressure, the heat of the hot nozzle cooling cylinder 10 can be better taken away. When the cooling water flows out of the cooling chamber 101 corresponding to the water outlet 22 , the cooling water flows from the first stepped surface 115 to the second stepped surface 116 , and the flow velocity to the water outlet 22 becomes faster to quickly flow out of the cooling chamber 101 .

In some embodiments, the end cap 12 has a connecting portion 124 fitted into the assembly port, the surface of the connecting portion 124 is provided with a first ring groove 125, and the first ring groove 125 is arranged around the connecting portion 124, and the nozzle cooling cylinder 10 also includes a second A sealing ring, the first sealing ring is installed in the first ring groove 125 for sealing the gap between the connecting portion 124 and the cylinder body 11 . With such arrangement, while the end cover 12 is easy to disassemble, the sealing effect between the end cover 12 and the connecting portion 124 can be improved, and the water in the cooling cavity 101 can be effectively prevented from flowing into the nozzle cooling cylinder 10 .

In some embodiments, the assembly hole 113 is provided with an internal thread, and the connecting portion 124 is provided with an external thread matched with the internal thread, so as to be screwed to the cylinder body 11 . With such an arrangement, while making the installation of the end cover 12 stable, the end cover 12 can also be easily disassembled.

In some embodiments, the cylinder body 11 includes a cylinder body 111 and a fixing flange 112 , one end of the cylinder body 111 is detachably connected to the end cap 12 , and the other end is detachably connected to the fixing flange 112 . That is, the fixed flange 112, the cylinder body 11 and the end cover 12 are detachable from each other, so that when one of them is worn or damaged, only the corresponding part needs to be replaced instead of the entire nozzle cooling cylinder 10, which can reduce the Maintenance cost of injection mold. Moreover, the fixed flange 112, the cylinder body 11 and the end cover 12 can be formed separately, and then assembled and fixed. Compared with the integrally formed hot nozzle cooling cylinder 10, the structure of the fixed flange 112, the cylinder body 11 and the end cover 12 Relatively simple, easy to shape, can reduce the difficulty of manufacturing the hot nozzle cooling cylinder 10, thereby reducing the production cost of the hot nozzle cooling cylinder 10, and improving practicability.

In some embodiments, the fixing flange 112 is provided with a second ring groove on the side facing the mold body 20, the first ring groove 125 is arranged around the cylinder body 111, and the nozzle cooling cylinder 10 also includes a second sealing ring, The second sealing ring is installed in the second ring groove. When the nozzle cooling cylinder 10 is installed on the mold body 20 , the second sealing ring is used to seal the gap between the fixing flange 112 and the mold body 20 .

The present invention also proposes an injection mold, which includes a mold body 20, a hot nozzle, and a hot nozzle cooling cylinder 10. For the specific structure of the hot nozzle cooling cylinder 10, refer to the above-mentioned embodiments. Since this injection mold adopts all the above-mentioned embodiments All the technical solutions of the present invention, therefore at least have all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be repeated here. Wherein, the mold body 20 is provided with a cooling waterway and a mounting hole 23 communicating with the cooling waterway, the mounting hole 23 communicates with the cavity of the mold body 20, the hot nozzle cooling cylinder 10 is installed in the mounting hole 23, and the hot nozzle cooling cylinder 10 is connected to the mounting hole 23. A cooling cavity 101 is formed between the hole walls of the hole 23 , and the hot nozzle is installed in the assembly hole 113 of the hot nozzle cooling cylinder 10 .

Specifically, the mold body 20 includes a movable mold part and a fixed mold part, and the movable mold part and the fixed mold part together form a cavity. Installed in the fixed mold part.

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. The utility model provides a hot mouth cooling cylinder for injection mold, injection mold is equipped with cooling water route and intercommunication the mounting hole in cooling water route, the mounting hole with injection mold's die cavity intercommunication, its characterized in that, hot mouth cooling cylinder includes:

the cooling device comprises a barrel body, a cooling device and a cooling device, wherein the barrel body is provided with an assembly hole, two ends of the assembly hole are communicated, the assembly hole is used for installing a heat supply nozzle, and the barrel body is used for being installed in the installation hole and forming a cooling cavity with the hole wall of the installation hole; and

the end cover, the end cover is equipped with the installation via hole, end cover detachably install in the one end of barrel, the installation via hole with the pilot hole intercommunication.

2. The hot nozzle cooling cylinder as claimed in claim 1, wherein the cylinder body has a plurality of water-retaining portions formed on the outer periphery thereof, the plurality of water-retaining portions extending along the circumferential direction of the cylinder body and being spaced apart from each other in the circumferential direction of the cylinder body, and the water-retaining portions are adapted to abut against the wall of the mounting hole when the cylinder body is mounted in the mounting hole, so that the cooling cavity is formed between any two adjacent water-retaining portions of the cylinder body and the wall of the mounting hole.

3. The hot nozzle cooling cylinder as claimed in claim 2, wherein the radial dimension of said end cap is smaller than the radial dimension of said cylinder body, when said cylinder body is installed in said installation hole, said end cap is used to form a diversion cavity with the wall of said installation hole, any two adjacent cooling cavities are separated by said water stop portion, and a plurality of said cooling cavities are communicated with said diversion cavity.

4. The hot nozzle cooling cartridge as claimed in claim 3, wherein the end face of the end cap is formed with an abutment portion disposed around the mounting via and an arcuate portion connected to a periphery of the abutment portion and disposed around the abutment portion.

5. The hot nozzle cooling cartridge as claimed in claim 1, wherein the portion of the cartridge body between any two adjacent water stop portions has a first step surface and a second step surface, the first step surface is located on a side of the second step surface adjacent to the end cap and is disposed through the end surface of the cartridge body, and the second step surface is disposed to protrude from the first step surface.

6. The hot nozzle cooling cylinder as claimed in claim 1, wherein the end cap has a connecting portion fitted into the fitting opening, the connecting portion has a first annular groove formed on a surface thereof, the first annular groove is disposed around the connecting portion, and the hot nozzle cooling cylinder further comprises a first sealing ring mounted to the first annular groove for sealing a gap between the connecting portion and the cylinder body.

7. The hot nozzle cooling cylinder as claimed in claim 6, wherein said fitting hole is provided with an internal thread therein, and said connecting portion is provided with an external thread engaged with said internal thread to be screw-coupled to said cylinder body.

8. The hot nozzle cooling cartridge as claimed in any one of claims 1 to 7, wherein the cartridge body comprises a cartridge body and a fixing flange, one end of the cartridge body being detachably connected to the end cap, and the other end being detachably connected to the fixing flange.

9. An injection mold, characterized in that, including mould body, hot mouth and according to claim 1 to 8 any one hot mouth cooling cylinder, the mould body is equipped with cooling water route and the mounting hole of intercommunication cooling water route, the mounting hole with the die cavity of mould body intercommunication, hot mouth cooling cylinder install in the mounting hole, just form the cooling chamber between the pore wall of hot mouth cooling cylinder and the mounting hole, hot mouth install in the mounting hole of hot mouth cooling cylinder.

10. The injection mold of claim 9, wherein the cooling water path comprises a water inlet and a water outlet formed in a wall of the mounting hole, the water inlet and the water outlet being disposed on opposite sides of the mounting hole and both facing a side surface of the cylinder of the hot nozzle cooling cylinder.

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