A movable bush structure with a cooling water path and a hot runner system

Abstract

The utility model discloses a movable bush structure with cooling water path, including inner bush and outer bush, the inner bush contains inner bush main part, and the upper end of inner bush main part is equipped with first positioning boss, and is equipped with first mounting hole on inner bush main part, and is equipped with first spiral water tank and second spiral water tank along the circumference of inner bush main part, and the lower end of the circumference of inner bush main part is equipped with the confluence groove, and is equipped with water inlet hole and water outlet hole on first positioning boss, the utility model discloses still a hot runner system, including movable bush structure, shunt, hot runner plate, bushing plate and hot nozzle, and second positioning boss is fixedly connected through screw with hot runner plate, and is equipped with water inlet channel and water outlet channel in hot runner plate. The utility model realizes the structure design of bush with cooling water path, and through the relative position fixation of movable bush structure and hot nozzle, can always cool hot nozzle, ensure the cooling of glue mouth position, prevent a series of adverse problems caused by the temperature of glue outlet being too high.

Description

Technical Field

[0001] This utility model relates to the technical field of hot runner systems, and in particular to a movable bushing structure with cooling water channels and a hot runner system. Background Technology

[0002] Hot runner injection molding is an advanced injection molding technology that offers higher production efficiency, less waste, and the ability to produce higher precision parts compared to traditional injection molding. In a hot runner injection mold, the plastic is heated to a fluid state within the mold via a heated hot runner system, eliminating the cooling time required during the injection molding process. Therefore, hot runner injection molds typically include a hot runner system to control the mold temperature and maintain the flow of the plastic.

[0003] In existing three-plate hot runner systems, bushings are typically included. However, these bushings generally lack cooling functionality. The relative movement between the mold core and the hot nozzle leads to inadequate cooling at the nozzle's gate, resulting in problems such as stringing and drooling. While cooling water jackets are also present in hot runner systems, they are usually fixed within the mold core. The relationship between the cooling water jacket and the hot nozzle is one of relative movement. When the hot nozzle moves away from the cooling water jacket, the same problem of inadequate cooling at the nozzle's gate occurs. For example, a rapid-circulation cooling water jacket disclosed in patent publication number CN210820766U includes a mold core and a cooling water jacket located within the mold core. The outer circumferential wall of the cooling water jacket is surrounded by a hot nozzle cooling water channel communicating with the nozzle core cooling water channel. The mold core contains inlet and outlet channels that communicate with either the hot nozzle cooling water channel or the nozzle core cooling water channel. In other words, the cooling water jacket is fixed within the mold core and cannot remain relatively stationary with the hot nozzle. When the hot nozzle moves with the hot runner plate, the nozzle's gate will experience inadequate cooling. Therefore, the cooling problem at the nozzle location urgently needs to be solved. Utility Model Content

[0004] The purpose of this invention is to provide a movable bushing structure with cooling water channels and a hot runner system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a movable bushing structure with cooling water channels, including an inner bushing and an outer bushing;

[0006] The inner liner includes a cylindrical inner liner body. The upper end of the inner liner body is provided with a first positioning boss protruding from its circumference. The inner liner body is provided with a first mounting hole that runs vertically through it. A first spiral water groove and a second spiral water groove are provided along the circumference of the inner liner body, arranged from top to bottom and in a staggered spiral configuration. The lower end of the circumference of the inner liner body is provided with a confluence groove that intersects and communicates with both the first and second spiral water grooves. The first positioning boss is provided with a water inlet hole that runs vertically through it and communicates with the first spiral water groove. The first positioning boss is also provided with a water outlet hole that runs vertically through it and communicates with the second spiral water groove.

[0007] The outer bushing includes a cylindrical outer bushing body. The upper end of the outer bushing body is provided with a second positioning boss protruding from its circumference. The outer bushing body is provided with a second mounting hole that runs vertically through the inner bushing for installation. The wall of the second mounting hole is interference-fitted with the outer wall of the inner bushing body. A spiral cavity for cooling water flow is formed between the inner wall of the inner bushing body, the first spiral water groove, the second spiral water groove, the confluence groove, and the inner wall of the outer bushing body.

[0008] Further optimization involves rotating the first and second spiral water channels in the same direction, which increases the area of ​​the first and second spiral water channels relative to the inner liner body and improves the cooling effect.

[0009] Further optimization involves the first positioning boss and the second positioning boss having circular sides, and each having two centrally symmetrical planes on its circumference. The upper surfaces of the first positioning boss and the second positioning boss are flush.

[0010] Further optimization involves providing a first sealing groove with a circular structure surrounding the outside of the first mounting hole on the lower end face of the inner liner body. A first sealing ring is provided in the first sealing groove to ensure the sealing effect between the bottom of the inner liner body and the second mounting hole and prevent water leakage.

[0011] Further optimization involves providing a positioning hole on the second positioning boss that communicates with the second mounting hole. The positioning hole and the second mounting hole have a stepped hole structure, and a second sealing groove is provided on the stepped surface. A second sealing ring is provided in the second sealing groove. The structure of the positioning hole is designed in conjunction with the first positioning boss to ensure the sealing effect between the first positioning boss and the second boss and prevent water leakage.

[0012] Further optimization involves providing four vertically penetrating connecting holes arranged in a rectangular array to ensure the secure installation of the second positioning boss.

[0013] This application also provides a hot runner system, including the movable bushing structure with cooling water passages described above, and further including a manifold, a hot runner plate, a nozzle plate, and a hot nozzle inserted into a first mounting hole. The manifold is embedded in the hot runner plate, the upper end of the hot nozzle is connected to the manifold, the second positioning boss is embedded in the bottom surface of the hot runner plate and fixedly connected by screws, the screws pass through the connecting hole and are connected to the hot runner plate, the outer bushing passes downward through the nozzle plate, the hot nozzle is clearance-fitted with the first mounting hole, and the hot runner plate is provided with an inlet channel communicating with the inlet hole and an outlet channel communicating with the outlet hole.

[0014] Further optimization involves providing a groove on the bottom surface of the hot runner plate for mounting the second positioning boss. The bottom of the groove has two third sealing grooves that surround the water inlet channel and the water outlet channel respectively. Each of the two third sealing grooves contains a third sealing ring to ensure that there is no water leakage between the hot runner plate and the movable bushing structure.

[0015] Beneficial Effects: This utility model's movable bushing structure with cooling water channels, through the combined design of an inner and outer bushing, achieves a bushing structure with cooling water channels. Specifically, the cooling water channel is formed by an inlet hole, a first spiral water groove, a confluence groove, a second spiral water groove, and an outlet hole. This can cool the thermally resistant body and nozzle part, preventing phenomena such as stringing, drooling, and material sticking caused by excessively high outlet temperature of the hot nozzle. It also has a heat insulation function, preventing heat from the hot nozzle from being transferred to other mold plates, causing heat loss, affecting the molding quality of the product, and causing poor appearance, etc. It also improves operational safety. The staggered spiral arrangement of the first and second spiral water grooves from top to bottom increases the length of the cooling water channel and the cooling area, improving the cooling effect. This movable bushing structure is suitable for cooling operations of single-nozzle, open, or needle valve type hot nozzles.

[0016] This utility model's hot runner system, through the fixed installation of both the movable bushing structure and the hot nozzle on the hot runner plate, ensures that the movable bushing structure and the hot nozzle remain relatively stationary. This guarantees that the movable bushing structure can move synchronously with the hot nozzle, ensuring that the movable bushing structure can always cool the hot nozzle, maintaining a stable temperature of the rubber compound inside the hot nozzle, and ensuring cooling of the dispensing nozzle area. This prevents a series of problems caused by excessively high dispensing nozzle temperatures, including stringing, drooling, and material sticking issues in large-nozzle hot nozzles; stringing, drooling, material sticking, and whitening of the dispensing nozzle in dispensing nozzles; and valve needle sticking and nozzle tip burns in needle valve hot nozzles. Attached Figure Description

[0017] Figure 1 This is an isometric structural diagram of the movable bushing structure with cooling water channels disclosed in the embodiments of this utility model.

[0018] Figure 2 This is a front view schematic diagram of the movable bushing structure with cooling water channels disclosed in the embodiments of this utility model.

[0019] Figure 3 This is a cross-sectional view of the movable bushing structure with cooling water channels disclosed in the embodiments of this utility model.

[0020] Figure 4 This is a schematic diagram of the inner liner disclosed in the embodiment of this utility model.

[0021] Figure 5 This is a schematic diagram of the structure of the outer bushing disclosed in the embodiment of this utility model.

[0022] Figure 6 This is a schematic diagram of the mating structure between the movable bushing structure and the hot nozzle as disclosed in the embodiments of this utility model.

[0023] Figure 7 This is a schematic diagram of the structure of the hot runner system disclosed in the embodiment of this utility model.

[0024] Reference numerals: 1-Inner bushing, 11-Inner bushing body, 12-First positioning boss, 13-First mounting hole, 14-First spiral water groove, 15-Second spiral water groove, 16-Gathering groove, 17-Inlet hole, 18-Outlet hole, 19-First sealing groove, 2-Outer bushing, 21-Outer bushing body, 22-Second positioning boss, 23-Second mounting hole, 24-Positioning hole, 25-Second sealing groove, 26-Connecting hole, 3-First sealing ring, 4-Second sealing ring, 5-Hot nozzle, 6-Diverter plate, 7-Hot runner plate, 71-Inlet channel, 72-Outlet channel, 73-Groove, 74-Third sealing groove, 8-Sprue plate, 9-Screw, 10-Third sealing ring. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figure 1-6 As shown, a movable bushing structure with cooling water channels includes an inner bushing 1 and an outer bushing 2.

[0027] The inner sleeve 1 includes a cylindrical inner sleeve body 11. The upper end of the inner sleeve body 11 is provided with a first positioning boss 12 protruding from its circumferential surface. The inner sleeve body 11 is provided with a first mounting hole 13 that runs vertically through it. Along the circumferential surface of the inner sleeve body 11, there are first spiral water channels 14 and second spiral water channels 15 arranged from top to bottom and staggered. The lower end of the circumferential surface of the inner sleeve body 11 is provided with a confluence channel 16 that intersects and communicates with both the first spiral water channel 14 and the second spiral water channel 15. The first positioning boss 12 is provided with a water inlet hole 17 that runs vertically through it and communicates with the first spiral water channel 14. The first positioning boss 12 is provided with a water outlet hole 18 that runs vertically through it and communicates with the second spiral water channel 15.

[0028] The outer bushing 2 includes a cylindrical outer bushing body 21. The upper end of the outer bushing body 21 is provided with a second positioning boss 22 protruding from its circumference. The outer bushing body 21 is provided with a second mounting hole 23 that runs vertically through the inner bushing 1. The hole wall of the second mounting hole 23 is interference-fitted with the outer wall of the inner bushing body 11. A spiral cavity for cooling water flow is formed between the inner wall of the inner bushing body 11, the first spiral water groove 14, the second spiral water groove 15, the confluence groove 16 and the inner wall of the outer bushing body 21.

[0029] In this application, the movable bushing structure includes an inner bushing 1 and an outer bushing 2. The inner bushing 1 is completely inside the outer bushing 2, and the two are partially interference-fitted to form a relatively fixed structure. The inner bushing 1 includes an inner bushing body 11, a first positioning boss 12, a first mounting hole 13, a first spiral water groove 14, a second spiral water groove 15, a confluence groove 16, a water inlet hole 17, and a water outlet hole 18. The inner bushing body 11 serves as the main structure and can be combined and connected with the outer bushing 2. The first positioning boss 12 is used for the installation positioning and limiting of the inner bushing 1 relative to the outer bushing 2, ensuring accurate installation positions. The first mounting hole 13 is used for the installation of the hot nozzle 5, which can cool the body and nozzle part of the hot nozzle 5, preventing the phenomena of stringing, drooling, and material sticking caused by excessively high outlet temperature of the hot nozzle 5. It also has a heat insulation function, preventing the heat on the hot nozzle 5 from being transferred to other templates, causing heat loss, affecting the molding quality of the product, causing poor appearance, etc., and also improving operational safety. The first spiral water channel 14 is connected to the inlet hole 17 and the manifold 16, and the second spiral water channel 15 is connected to the outlet hole 18 and the manifold 16. This forms a cooling water channel consisting of the inlet hole 17, the first spiral water channel 14, the manifold 16, the second spiral water channel 15, and the outlet hole 18. This allows cooling water to flow in through the inlet hole 17 and out through the outlet hole 18, carrying away the heat emitted by the hot nozzle 5 and preventing excessive temperature inside the hot nozzle 5, which could affect the product molding quality. The manifold 16 is connected to the first spiral water channel 14 and the second spiral water channel 15, allowing cooling water to flow in from the first spiral water channel 14 and out through the second spiral water channel 15, expelling the heat-absorbing cooling water and ensuring effective cooling. Simultaneously, the manifold 16 is located at the lower end of the inner bushing body 11, effectively cooling the nozzle 5 at the injection nozzle nozzle during injection, and effectively solving problems such as stringing and drooling at the nozzle nozzle.

[0030] In this application, the first spiral water channel 14 and the second spiral water channel 15 are arranged from top to bottom and are staggered, which can increase the length of the cooling water channel and the cooling area, thereby improving the cooling effect. The inlet hole 17 is used for the inflow of cooling water, and the outlet hole 18 is used for the outflow of cooling water. This movable bushing structure has a cooling function and can be applied to single-nozzle, open, and needle valve type hot nozzles. It has a good cooling effect and solves the problem that traditional bushings do not have a cooling function.

[0031] In this application, the outer bushing 2 includes an outer bushing body 21, a second positioning boss 22, and a second mounting hole 23. The outer bushing body 21 is used to connect with the inner bushing body 11 to ensure that the movable bushing structure can move synchronously as a whole. The second positioning boss 22 is used for the installation and positioning of the outer bushing 2 in the mold to ensure the installation and positioning of the movable bushing structure. The second mounting hole 23 is used for the installation of the inner bushing 1 and, through an interference fit with the outer wall of the inner bushing body 11, the relative positions of the inner bushing 1 and the outer bushing 2 are fixed. It also ensures that a seal for the flow of cooling water is formed between the inner wall of the inner bushing body 11, the first spiral water groove 14, the second spiral water groove 15, the confluence groove 16, and the inner wall of the outer bushing body 21. The formed spiral cavity ensures that the cooling water can flow along the cavity, carry away heat, and achieve a good cooling effect.

[0032] like Figure 4 As shown, in one embodiment of this application, the first spiral water tank 14 and the second spiral water tank 15 rotate in the same direction, further increasing the area occupied by the first spiral water tank 14 and the second spiral water tank 15 relative to the inner bushing body 11, thereby improving the cooling effect. Furthermore, the same rotation direction reduces processing difficulty and requirements; it also contributes to the stability of cooling water flow and helps to remove heat.

[0033] like Figure 1 , Figure 4 and Figure 5 As shown, in another embodiment of this application, the sides of the first positioning boss 12 and the second positioning boss 22 are both circular, and two centrally symmetrical planes are provided on the circumferential surface of both. The upper surfaces of the first positioning boss 12 and the second positioning boss 22 are flush.

[0034] In this embodiment, the sides of the first positioning boss 12 and the second positioning boss 22 are circular, which facilitates processing and, in conjunction with the cylindrical structures of the corresponding inner bushing body 11 and outer bushing body 21, ensures the uniformity of stress on the overall structure and improves its overall strength. The flat surfaces on the circumference of the first positioning boss 12 and the second positioning boss 22 are used for installation positioning and limiting, ensuring the installation accuracy of the inner bushing 1 relative to the outer bushing 2 and the outer bushing 2 relative to the mold.

[0035] like Figure 3 As shown, in another embodiment of this application, a first sealing groove 19 with a circular structure surrounding the outside of the first mounting hole 13 is provided on the lower end face of the inner bushing body 11, and a first sealing ring 3 is provided in the first sealing groove 19. By providing the first sealing groove 19 and the first sealing ring 3, the sealing effect between the lower end face of the inner bushing body 11 and the lower end of the inner wall of the outer bushing body 21 can be ensured, preventing water leakage caused by cooling water flowing out through the gap between the lower end of the inner bushing body 11 and the inner wall of the outer bushing body 21, which would affect product forming and equipment safety.

[0036] like Figure 3 and Figure 5 As shown, based on the above scheme, in another embodiment of this application, the second positioning boss 22 is provided with a positioning hole 24 communicating with the second mounting hole 23. The positioning hole 24 and the second mounting hole 23 have a stepped hole structure and a second sealing groove 25 is provided on the stepped surface. A second sealing ring 4 is provided in the second sealing groove 25. The structure of the positioning hole 24 is designed to match the first positioning boss 12.

[0037] The positioning hole 24 is used to position the first positioning boss 12 to ensure accurate installation of the inner bushing 1. A second sealing groove 25 is provided on the stepped surface of the positioning hole 24 and the second mounting hole 23. This groove is used for installing the second sealing ring 4, and surrounds the outside of the water inlet hole 17 and the water outlet hole 18. The second sealing ring 4 seals the gap between the first positioning boss 12 and the second positioning boss 22, preventing water leakage caused by water flowing out through the gap between the first positioning boss 12 and the second positioning boss 22 from the water inlet hole 17, the first spiral water groove 14, the second spiral water groove 15, and the water outlet hole 18.

[0038] like Figure 1 and Figure 5 As shown, in another embodiment of this application, the second positioning boss 22 is provided with four vertically penetrating connecting holes 26 arranged in a rectangular array, which facilitates the connection and fixation of the second positioning boss 22 relative to the mold. The outer bushing 2 can be fixed simply by passing a screw or bolt through the connecting hole 26, thereby achieving the overall fixation of the movable bushing structure.

[0039] like Figure 7 As shown, this application also provides a hot runner system, including the movable bushing structure with cooling water passages described in the above scheme, and also including a manifold 6, a hot runner plate 7, a sprue plate 8, and a hot nozzle 5 inserted into the first mounting hole 13. The manifold 6 is embedded in the hot runner plate 7, the upper end of the hot nozzle 5 is connected to the manifold 6, the second positioning boss 22 is embedded in the bottom surface of the hot runner plate 7 and fixedly connected by a screw 9, the screw 9 passes through the connecting hole 26 and is connected to the hot runner plate 7, the outer bushing 2 passes downward through the sprue plate 8, the hot nozzle 5 is clearance-fitted with the first mounting hole 13, and the hot runner plate 7 is provided with a water inlet channel 71 communicating with the water inlet hole 17 and a water outlet channel 72 communicating with the water outlet hole 18.

[0040] In this application, the hot runner system includes a movable bushing structure, a hot nozzle 5, a manifold 6, a hot runner plate 7, and a sprue plate 8. The movable bushing structure and the hot nozzle 5 are both fixed on the hot runner plate 7, so that the movable bushing structure and the hot nozzle 5 remain relatively stationary. When the panel and the hot runner plate 7 move the hot nozzle 5 up and down, the movable bushing structure will also maintain synchronous relative movement, ensuring that the relative position between the movable bushing structure and the hot nozzle 5 is fixed. This ensures that the movable bushing structure can always cool the hot nozzle 5, ensuring that the temperature of the rubber material inside the hot nozzle 5 is stable, and ensuring that the nozzle position is cooled, avoiding problems such as stringing and drooling caused by insufficient cooling.

[0041] In this application, the upper end of the hot nozzle 5 of the hot runner system is connected to the manifold 6, which is fixed inside the hot runner plate 7. The hot nozzle 5 is pressed and secured to the hot runner plate 7 by the manifold 6. The second positioning boss 22 is fixed to the hot runner plate 7 by screws 9, which can fix the movable bushing structure below the hot runner plate 7. This ensures that when the hot runner plate 7 moves the hot nozzle 5 up and down, the movable bushing structure can maintain synchronous movement with the hot nozzle 5, ensuring cooling of the hot nozzle body and the hot nozzle head, and preventing a series of problems caused by excessively high outlet temperature, including:

[0042] 1. It can solve problems such as stringing, drooling, and material sticking that occur when using a large hot nozzle;

[0043] 2. It can solve problems such as stringing, drooling, material sticking, and whitening of the glue nozzle when the hot nozzle is applied;

[0044] 3. It can solve problems such as valve needle sticking and nozzle tip burns that occur when the needle valve hot nozzle is hot.

[0045] In this application, the outer bushing 2 passes downward through the sprue plate 8 to ensure the stable installation of the movable bushing structure. The hot nozzle 5 is fitted with the first mounting hole 13 with a clearance to prevent direct contact between the hot nozzle 5 and the inner bushing 1, which would cause a large amount of heat to be carried away by the cooling water, resulting in severe heat loss and affecting the product molding quality. The water inlet channel 71 and the water outlet channel 72 are both located inside the hot runner plate 7, which can improve the overall temperature uniformity of the hot runner plate 7, prevent local overheating, and make the core area of ​​the hot runner plate 7 more stable in temperature, reducing temperature fluctuations and thus improving the consistency of injection molded product quality. At the same time, the connection between the water inlet channel 71 and the water inlet hole 17, and the connection between the water outlet channel 72 and the water outlet hole 18 are ensured to achieve overall heat dissipation of the hot runner plate 7 by the cooling water channel.

[0046] Continue to refer to Figure 7As shown, based on the above scheme, in one embodiment of the hot runner system, a groove 73 for mounting the second positioning boss 22 is provided on the bottom surface of the hot runner plate 7. Two third sealing grooves 74 are provided on the bottom of the groove 73, respectively surrounding the water inlet channel 71 and the water outlet channel 72. A third sealing ring 10 is provided in each of the two third sealing grooves 74.

[0047] In this embodiment, the groove 73 is used for the installation of the second positioning boss 22, realizing the connection between the movable bushing structure and the hot runner plate 7. A third sealing groove 74 is provided at the bottom of the groove 73. Two third sealing grooves 74 are respectively arranged around the ports of the water inlet channel 71 and the water outlet channel 72, and are used for the embedding of the third sealing ring 10 to achieve the sealing between the hot runner plate 7 and the first positioning boss 12, ensuring that the cooling water will not flow out from the gap near the joint of the water inlet channel 71 and the water inlet hole 17, nor from the gap near the joint of the water outlet channel 72 and the water outlet hole 18, ensuring that there is no water leakage.

[0048] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A movable bushing structure with cooling water channels, characterized in that, Includes an inner liner (1) and an outer liner (2); The inner sleeve (1) includes a cylindrical inner sleeve body (11). The upper end of the inner sleeve body (11) is provided with a first positioning boss (12) protruding from its circumference. The inner sleeve body (11) is provided with a first mounting hole (13) that runs vertically through it. Along the circumference of the inner sleeve body (11), there is a first spiral water groove (14) and a second spiral water groove (15) arranged from top to bottom and in a staggered spiral configuration. The lower end of the circumference of the inner sleeve body (11) is provided with a confluence groove (16) that intersects and communicates with both the first spiral water groove (14) and the second spiral water groove (15). The first positioning boss (12) is provided with a water inlet hole (17) that runs vertically through it and communicates with the first spiral water groove (14). The first positioning boss (12) is provided with a water outlet hole (18) that runs vertically through it and communicates with the second spiral water groove (15). The outer bushing (2) includes a cylindrical outer bushing body (21). The upper end of the outer bushing body (21) is provided with a second positioning boss (22) protruding from its circumference. The outer bushing body (21) is provided with a second mounting hole (23) that runs vertically through the inner bushing (1) for installation. The wall of the second mounting hole (23) is press-fitted with the outer wall of the inner bushing body (11). A spiral cavity for cooling water flow is formed between the inner wall of the inner bushing body (11), the first spiral water groove (14), the second spiral water groove (15), the confluence groove (16), and the inner wall of the outer bushing body (21).

2. The movable bushing structure with cooling water channels according to claim 1, characterized in that, The first spiral water tank (14) and the second spiral water tank (15) rotate in the same direction.

3. The movable bushing structure with cooling water channels according to claim 1, characterized in that, The sides of the first positioning boss (12) and the second positioning boss (22) are both circular, and two centrally symmetrical planes are provided on the circumference of both. The upper surfaces of the first positioning boss (12) and the second positioning boss (22) are flush.

4. The movable bushing structure with cooling water channels according to claim 1, characterized in that, The lower end face of the inner sleeve body (11) is provided with a first sealing groove (19) of a circular structure surrounding the outside of the first mounting hole (13), and a first sealing ring (3) is provided in the first sealing groove (19).

5. The movable bushing structure with cooling water channels according to claim 3, characterized in that, The second positioning boss (22) is provided with a positioning hole (24) communicating with the second mounting hole (23). The positioning hole (24) and the second mounting hole (23) have a stepped hole structure and a second sealing groove (25) is provided on the stepped surface. A second sealing ring (4) is provided in the second sealing groove (25). The structure of the positioning hole (24) is designed to match the first positioning boss (12).

6. The movable bushing structure with cooling water channels according to claim 1, characterized in that, The second positioning boss (22) has four connecting holes (26) that are vertically connected and arranged in a rectangular array.

7. A hot runner system, characterized in that, The movable bushing structure with cooling water passage as described in any one of claims 1-6 further includes a flow divider plate (6), a hot runner plate (7), a nozzle plate (8), and a hot nozzle (5) inserted into a first mounting hole (13). The flow divider plate (6) is embedded in the hot runner plate (7). The upper end of the hot nozzle (5) is connected to the flow divider plate (6). The second positioning boss (22) is embedded in the bottom surface of the hot runner plate (7) and fixedly connected by a screw (9). The screw (9) passes through the connecting hole (26) and is connected to the hot runner plate (7). The outer bushing (2) passes downward through the nozzle plate (8). The hot nozzle (5) is clearance-fitted with the first mounting hole (13). The hot runner plate (7) is provided with an inlet channel (71) communicating with the inlet hole (17) and an outlet channel (72) communicating with the outlet hole (18).

8. The hot runner system according to claim 7, characterized in that, The bottom surface of the hot runner plate (7) is provided with a groove (73) for mounting the second positioning boss (22). The bottom of the groove (73) is provided with two third sealing grooves (74) that surround the water inlet channel (71) and the water outlet channel (72) respectively. Each of the two third sealing grooves (74) is provided with a third sealing ring (10).

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