Hot nozzle core

Abstract

The utility model provides a hot nozzle core and belongs to the technical field of hot runner systems of injection molds. The structure comprises an inner annular component, the center of the inner annular component is provided with a melt channel used for connecting a sprue and a nozzle runner, the inner annular component is sleeved with an outer annular component, and a middle annular component used for preventing melt leakage is arranged between the outer annular component and the inner annular component. An axial positioning sealing structure is arranged between the middle annular component and the inner annular component and between the middle annular component and the outer annular component, and an outer axial positioning structure is arranged on the outer wall of the outer annular component. The outer annular component, the middle annular component and the inner annular component are pressed and attached to form a sealing interface, the middle annular component can eliminate a gap between the inner annular component and the outer annular component, and melt leakage caused by sealing failure and stress concentration caused by the gap can be avoided. High-efficiency conduction of heat through a contact surface can be ensured, contact thermal resistance can be reduced, and heat conduction efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection mold hot runner system technical field relates to a hot nozzle core. BACKGROUND

[0002] The hot nozzle core of the hot runner system is a key transmission component for transmitting melt from the nozzle to the mold cavity, and its performance directly affects the molding efficiency and product quality. However, the traditional hot nozzle core usually adopts a single-layer or simple stacked structure, which relies on the machining precision of a single contact surface for sealing design. Under high pressure and high temperature conditions, the interface gap may be caused by thermal expansion difference or material creep, leading to melt leakage, which not only pollutes the mold but also increases the frequency of downtime maintenance. In addition, the heat conduction structure lacks hierarchical optimization, the contact thermal resistance between components is large, and the heat transfer efficiency is low, resulting in uneven temperature distribution in the gate area, which may cause premature solidification or local overheating carbonization of the melt, affecting the molding stability. SUMMARY

[0003] The utility model aims at above -mentioned problem, provides a kind of hot nozzle core.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A hot nozzle core includes an inner annular member, a melt channel for connecting a gate and a nozzle runner is provided at the center of the inner annular member, an outer annular member is sleeved outside the inner annular member, a middle annular member for preventing melt leakage is provided between the outer annular member and the inner annular member, an axial positioning and sealing structure is provided between the middle annular member and the inner annular member and the outer annular member, and an outer axial positioning structure is provided on the outer wall of the outer annular member.

[0006] The outer annular member provides external support, the outer axial positioning structure cooperates with the mold body to ensure overall positioning. The middle annular member can seal the gap between the inner annular member and the outer annular member, prevent melt from penetrating into the non-contact area, reduce the risk of leakage, and at the same time transfer heat. In addition, the multi-layer annular structure forms a prestress through the axial positioning and sealing structure, which can enhance the resistance to plastic pressure.

[0007] In the above hot nozzle core, the inner wall and the outer wall of the middle annular member are adapted to the outer wall of the inner annular member and the inner wall of the outer annular member respectively.

[0008] The middle annular member closely fits between the inner annular member and the outer annular member, which can eliminate the gap between the inner annular member and the outer annular member, avoid melt leakage caused by sealing failure or stress concentration caused by the gap, and ensure efficient heat conduction through the contact surface between the components, reduce the contact thermal resistance and improve the heat conduction efficiency.

[0009] In the hot nozzle core, the axial positioning sealing structure comprises a first inner annular step arranged on the upper end of the outer annular member, and the upper end of the middle annular member is provided with a first outer convex edge matched with the first inner annular step,

[0010] The upper end of the inner annular member is provided with a second outer convex edge, and the upper end of the middle annular member abuts against the second outer convex edge,

[0011] The outer annular member, the middle annular member and the inner annular member are tightly fitted with each other.

[0012] The outer annular member, the middle annular member and the inner annular member are tightly fitted with each other to form a sealing interface, which can avoid melt leakage caused by sealing failure or stress concentration caused by gap, and can also ensure efficient heat conduction through the contact surface, reduce contact thermal resistance and improve heat conduction efficiency.

[0013] In the hot nozzle core, the upper end of the outer annular member is flush with the upper end of the inner annular member, and the outer wall of the second outer convex edge abuts against the inner wall of the first inner annular step;

[0014] Alternatively, the upper end of the outer annular member is flush with the upper end of the inner annular member, and the upper end of the first outer convex edge is provided with an extension ring located between the outer wall of the second outer convex edge and the inner wall of the first inner annular step, and the inner wall and the outer wall of the extension ring are tightly attached to the outer wall of the second outer convex edge and the inner wall of the first inner annular step, respectively.

[0015] The outer wall of the second outer convex edge directly contacts the inner wall of the first inner annular step, and the direct contact surface forms a tight press fit, which can effectively transfer heat and prevent melt from penetrating into the gap;

[0016] The extension ring fills the gap between the second outer convex edge and the first inner annular step, forms a double sealing interface, significantly improves the anti-leakage ability in high-pressure environment, and can enhance the sealing reliability.

[0017] In the hot nozzle core, the axial positioning sealing structure comprises a first inner annular step arranged on the upper end of the outer annular member, and the upper end of the inner annular member is provided with a second outer convex edge matched with the first inner annular step, and a middle annular inner step is arranged between the second outer convex edge and the middle annular member, and the middle annular member is arranged in the middle annular inner step, and the axial height of the inner end of the middle annular inner step is the same as or different from the axial height of the bottom surface of the second outer convex edge.

[0018] The outer annular member, the middle annular member and the inner annular member are tightly fitted with each other to form a sealing interface, which can avoid melt leakage caused by sealing failure or stress concentration caused by gap, and can also ensure efficient heat conduction through the contact surface, reduce contact thermal resistance and improve heat conduction efficiency.

[0019] In the aforementioned hot nozzle core, the inner wall of the middle annular component is adapted to the outer wall of the inner annular component and the outer wall of the outer annular component, respectively, and the upper end of the middle annular component is flush with the upper end of the inner annular component.

[0020] The middle annular component is fitted onto the inner annular component and the outer annular component. The inner wall of the middle annular component is tightly fitted with the outer wall of the inner annular component and the outer wall of the outer annular component, respectively, which can eliminate radial gaps and prevent the melt from penetrating into the non-contact area.

[0021] In the aforementioned hot nozzle core, the axial positioning sealing structure includes a third outer annular step disposed on the upper end of the outer annular member, the lower end of the middle annular member abutting against the third outer annular step, and the upper end of the outer annular member abutting against the lower end of the third outer protrusion at the upper end of the inner annular member.

[0022] Alternatively, the axial positioning sealing structure includes a third outer annular step at the upper end of the outer annular member, a third inner annular step at the lower end of the middle annular member that can cooperate with the third outer annular step, and the upper end of the outer annular member abuts against the lower end of the third outer protrusion at the upper end of the inner annular member.

[0023] Axial positioning is achieved by the direct abutment between the third outer ring step and the lower end of the middle ring component, and axial positioning is achieved by the upper end of the outer ring component abutting against the lower end of the third outer protrusion of the upper end of the inner ring component.

[0024] The third inner ring step at the lower end of the middle ring component cooperates with the third outer ring step to achieve axial positioning, and the upper end of the outer ring component abuts against the lower end of the third outer protrusion at the upper end of the inner ring component to achieve axial positioning.

[0025] In the aforementioned hot nozzle core, the axial positioning sealing structure includes a fourth outer protrusion at the upper end of the inner annular component, a fifth outer protrusion at the upper end of the outer annular component, and the upper and lower ends of the middle annular component respectively abut against the lower end of the fourth outer protrusion and the upper end of the fifth outer protrusion. The outer wall of the inner annular component is adapted to the inner wall of the outer annular component and the inner wall of the middle annular component.

[0026] The upper and lower ends of the middle ring component abut against the lower end of the fourth outer convex edge and the upper end of the fifth outer convex edge respectively to achieve axial positioning.

[0027] In the aforementioned hot nozzle core, the outer axial positioning structure includes any one or more of the following: an outer annular positioning step disposed at the lower end of the outer wall of the outer annular component, an annular conical surface on the outer wall of the outer annular component, or an annular arcuate surface on the outer wall of the outer annular component.

[0028] By using the outer annular positioning step at the lower end of the outer wall of the outer annular component to cooperate with the mold body, rapid installation and positioning can be achieved, and thermal expansion can be accommodated, thereby improving assembly accuracy.

[0029] In the aforementioned hot nozzle core, an anti-lag ring is provided on the lower outer wall of the inner annular component, and the lower outlet of the melt channel is located above the lower outlet of the anti-lag ring, forming a secondary connection channel between the lower outlet of the melt channel and the lower outlet of the anti-lag ring.

[0030] The secondary connection channel formed between the lower outlet of the melt channel and the lower outlet of the anti-stagnant ring can guide the melt to flow in a concentrated manner, avoid stagnation, prevent plastic residue, and meet the hygiene requirements of food and medical grade.

[0031] In the aforementioned hot nozzle core, at least one sixth outer annular step is provided on the lower outer wall of the inner annular component, and a sixth inner annular step that can cooperate with the sixth outer annular step is provided on the inner wall of the anti-lag ring.

[0032] The sixth inner ring step on the inner wall of the anti-lock ring cooperates with the sixth outer ring step on the lower outer wall of the inner ring component to achieve axial positioning.

[0033] In the aforementioned hot nozzle core, at least one seventh outer annular step is provided on the lower outer wall of the inner annular component, and a seventh inner annular step that can cooperate with the seventh outer annular step is provided on the inner wall of the anti-lag ring.

[0034] By forming multiple sealing interfaces through multi-level positioning, the melt penetration path is blocked step by step, significantly improving the sealing effect. The multiple sealing interfaces can disperse the injection pressure and thermal expansion stress, avoiding single-point seal failure.

[0035] In the aforementioned hot nozzle core, the inner annular component, the middle annular component, and the outer annular component are made of materials with different thermal conductivity coefficients;

[0036] Alternatively, the inner ring component, middle ring component, and outer ring component may be made of materials with similar thermal conductivity.

[0037] By optimizing heat distribution, local overheating or underheating can be avoided.

[0038] In the aforementioned hot nozzle core, the thermal conductivity of the outer annular component is less than that of the inner annular component, and the thermal conductivity of the inner annular component is less than that of the middle annular component.

[0039] The middle ring component has a high thermal conductivity, which can quickly transfer heat from the nozzle heater to the gate. The outer ring component has a low thermal conductivity, which can reduce heat loss and protect the mold body. The inner ring component has a medium to high thermal conductivity, which is in direct contact with the melt, and can balance thermal conductivity and durability.

[0040] In the aforementioned hot nozzle core, the lower end of the inner annular component is far from the lower end of the outer annular component, and the lower end of the middle annular component is close to the lower end of the outer annular component.

[0041] Alternatively, the lower end of the inner ring component is far from the lower end of the outer ring component, and the lower end of the middle ring component is close to the lower end of the inner ring component.

[0042] The central ring component can be extended further to get closer to the gate, which can enhance the local heating effect and adapt to different gate types.

[0043] Compared with existing technologies, the advantages of this invention are as follows: 1. The outer annular component, the middle annular component, and the inner annular component are pressed together to form a sealing interface. The middle annular component can eliminate the gap between the inner and outer annular components, thus avoiding melt leakage due to seal failure and stress concentration due to gaps. 2. It can ensure efficient heat conduction through the contact surface, reduce contact thermal resistance, and improve thermal conductivity. 3. The multi-layer annular structure forms prestress through the axial positioning sealing structure, which can enhance resistance to plastic pressure. Attached Figure Description

[0044] Figure 1 This is a diagram showing the usage status of the heating element;

[0045] Figure 2 This is a schematic diagram of the heating element core;

[0046] Figure 3 This is a cross-sectional view of the hot nozzle core;

[0047] Figure 4 This is a cross-sectional view of the heating nozzle core in Example 2;

[0048] Figure 5 This is a cross-sectional view of the heating nozzle core in Example 3;

[0049] Figure 6 This is a cross-sectional view of the hot nozzle core in Example 4;

[0050] Figure 7 This is a cross-sectional view of the heating nozzle core in Example 5;

[0051] Figure 8 This is a cross-sectional view of the heating nozzle core in Example 6;

[0052] Figure 9 This is a cross-sectional view of the heating nozzle core in Example 7;

[0053] Figure 10 This is a cross-sectional view of the heating nozzle core in Example 8;

[0054] Figure 11 This is a schematic diagram of the anti-hysteresis ring in Example 9;

[0055] Figure 12 This is a cross-sectional view of the hot nozzle core in Example 10.

[0056] In the figure, the components are: inner annular component 1, gate 2, nozzle 3, melt channel 4, outer annular component 5, middle annular component 6, axial positioning sealing structure 7, outer axial positioning structure 8, first inner annular step 9, first outer convex edge 10, second outer convex edge 11, extension ring 12, third outer annular step 13, third outer convex edge 14, third inner annular step 15, fourth outer convex edge 16, fifth outer convex edge 17, outer annular positioning step 18, anti-lag ring 21, secondary connection channel 22, sixth outer annular step 23, sixth inner annular step 24, seventh outer annular step 25, seventh inner annular step 26, mold body 27, nozzle body 28, end ring 29, valve needle 30, and middle annular inner step 31. Detailed Implementation

[0057] Example 1

[0058] like Figures 1-3 As shown, a hot nozzle core includes an inner annular component 1, with a melt channel 4 at the center of the inner annular component 1 for connecting the gate 2 and the nozzle 3 flow channel. An outer annular component 5 is sleeved on the outside of the inner annular component 1. A middle annular component 6 is provided between the outer annular component 5 and the inner annular component 1 to prevent melt leakage. An axial positioning sealing structure 7 is provided between the middle annular component 6 and the inner annular component 1 and the outer annular component 5. An outer axial positioning structure 8 is provided on the outer wall of the outer annular component 5.

[0059] In this invention, the hot nozzle core includes an inner annular component 1, a middle annular component 6, and an outer annular component 5. The inner annular component 1 directly contacts the melt, which flows along the melt channel 4. The middle annular component 6 forms an axial seal with the inner annular component 1 and the outer annular component 5 through an axial positioning sealing structure 7, which can prevent melt leakage and transfer heat at the same time. The outer annular component 5 is fixed to the nozzle body through an outer axial positioning structure 8.

[0060] The outer annular component 5 provides external support, and the outer axial positioning structure 8 cooperates with the mold body 27 to ensure overall positioning. The middle annular component 6 can seal the gap between the inner annular component 1 and the outer annular component 5, preventing the melt from penetrating into the non-contact area, reducing the risk of leakage, and transferring heat at the same time. In addition, the multi-layer annular structure forms prestress through the axial positioning sealing structure 7, which can enhance the resistance to plastic pressure.

[0061] Specifically, combining Figure 3 As shown, the inner and outer walls of the middle annular component 6 are adapted to the outer wall of the inner annular component 1 and the inner wall of the outer annular component 5, respectively. The axial positioning sealing structure 7 includes a first inner annular step 9 disposed at the upper end of the outer annular component 5, a first outer protruding edge 10 disposed at the upper end of the middle annular component 6 that mates with the first inner annular step 9, a second outer protruding edge 11 disposed at the upper end of the inner annular component 1, and the upper end of the middle annular component 6 abuts against the second outer protruding edge 10.

[0062] The outer ring component 5, the middle ring component 6, and the inner ring component 1 are fitted together.

[0063] The close fit between the middle annular component 6 and the inner annular component 1 and the outer annular component 5 can eliminate the gap between the inner annular component 1 and the outer annular component 5, and can avoid melt leakage caused by sealing failure or stress concentration caused by gap. In addition, the close fit between the components can also ensure efficient heat conduction through the contact surface, reduce contact thermal resistance, and improve thermal conductivity.

[0064] The first outer protruding edge 10 at the upper end of the middle ring component 6 cooperates with the first inner ring step 9 at the upper end of the outer ring component 5 to achieve axial positioning, and the upper end of the middle ring component 6 abuts against the second outer protruding edge 11 at the upper end of the inner ring component 1 to achieve axial positioning.

[0065] The outer ring component 5, the middle ring component 6 and the inner ring component 1 are pressed together to form a sealing interface, which can avoid melt leakage due to sealing failure or stress concentration due to gaps. It can also ensure that heat is efficiently conducted through the contact surface, reduce contact thermal resistance and improve thermal conductivity.

[0066] Specifically, combining Figure 3 As shown, the upper end of the outer ring component 5 is flush with the upper end of the inner ring component 1, and the outer wall of the second outer protrusion 11 abuts against the inner wall of the first inner ring step 9.

[0067] The outer wall of the second outer protrusion 11 directly contacts the inner wall of the first inner annular step 9, and the direct contact surface forms a tight press fit, which can effectively transfer heat and prevent the melt from penetrating into the gap.

[0068] Specifically, combining Figure 3 As shown, the outer axial positioning structure 8 includes any one or more of the following: an outer annular positioning step 18 disposed at the lower end of the outer wall of the outer annular member 5, an annular conical surface on the outer wall of the outer annular member 5, or an annular arc-shaped surface on the outer wall of the outer annular member 5.

[0069] In this embodiment, the outer axial positioning structure 8 includes an outer annular positioning step 18 disposed at the lower end of the outer wall of the outer annular member 5.

[0070] By engaging the outer annular positioning step 18 at the lower end of the outer wall of the outer annular component 5 with the mold body 27, rapid installation and positioning can be achieved, and thermal expansion can be accommodated, thereby improving assembly accuracy.

[0071] Preferably, combined with Figure 3 As shown, the inner ring component 1, the middle ring component 6, and the outer ring component 5 are made of materials with different thermal conductivity; or, the inner ring component 1, the middle ring component 6, and the outer ring component 5 are made of materials with similar thermal conductivity.

[0072] In this embodiment, the thermal conductivity of the outer annular component 5 is less than that of the inner annular component 1, and the thermal conductivity of the inner annular component 1 is less than that of the middle annular component 6.

[0073] The middle annular component 6 has a high thermal conductivity, which can quickly transfer heat from the nozzle heater to the gate. The outer annular component 5 has a low thermal conductivity, which can reduce heat loss and protect the mold body 27. The inner annular component 1 has a medium to high thermal conductivity, which directly contacts the melt and can balance thermal conductivity and durability.

[0074] Specifically, combining Figure 3 As shown, the lower end of the inner ring component 1 is far from the lower end of the outer ring component 5, and the lower end of the middle ring component 6 is close to the lower end of the outer ring component 5.

[0075] Specifically, combining Figure 1 As shown, the mold body 27 has an installation groove adapted to the nozzle body 28. The nozzle heater is arranged in a spiral winding or segmented manner on the outer peripheral wall of the nozzle body 28 and achieves closed-loop temperature control through thermocouples (not shown in the figure). The hot nozzle core is located at the bottom inner end of the nozzle body 28. The upper ends of the inner annular component 1 and the outer annular component 5 abut against and seal against the bottom inner end of the nozzle body 28. An end ring 29 is screwed onto the outer wall of the outer annular component 5. The upper end of the end ring 29 abuts against the outer annular positioning step 18. The end ring 29 is used to fix the outer annular component 5. A valve needle 30 is provided in the melt channel 4 and the nozzle 3 flow channel.

[0076] The working principle of this utility model is as follows: the first outer protruding edge 10 at the upper end of the middle annular component 6 cooperates with the first inner annular step 9 at the upper end of the outer annular component 5 to achieve axial positioning; the upper end of the middle annular component 6 abuts against the second outer protruding edge 11 at the upper end of the inner annular component 1 to achieve axial positioning; the middle annular component 6 and the outer annular component 5 are pressed and fitted together with the inner annular component 1 to form a sealing interface, which can eliminate the gap between the inner annular component 1 and the outer annular component 5, avoid melt leakage caused by sealing failure and stress concentration caused by gap, and effectively transfer heat.

[0077] Example 2

[0078] like Figure 4 As shown, the structure and working principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the upper end of the outer ring component 5 is flush with the upper end of the inner ring component 1, and the upper end of the first outer protrusion 10 is provided with an extension ring 12 located between the outer wall of the second outer protrusion 11 and the inner wall of the first inner ring step 9. The inner wall and outer wall of the extension ring 12 are respectively in close contact with the outer wall of the second outer protrusion 11 and the inner wall of the first inner ring step 9.

[0079] The inner and outer walls of the extension ring 12 are respectively tightly attached to the outer wall of the second outer protrusion 11 and the inner wall of the first inner annular step 9. The extension ring 12 fills the gap between the second outer protrusion 11 and the first inner annular step 9, forming a double sealing interface, which significantly improves the leakage prevention capability under high pressure environment and enhances the sealing reliability.

[0080] Example 3

[0081] like Figure 5 As shown, the structure and working principle of this embodiment are basically the same as those of embodiment two. The difference is that the extension ring 12 and the middle ring component 6 are integrated.

[0082] Example 4

[0083] like Figure 6 As shown, the structure and working principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the axial positioning sealing structure 7 includes a first inner annular step 9 disposed on the upper end of the outer annular member 5. The upper end of the inner annular member 1 is provided with a second outer protruding edge 11 that can cooperate with the first inner annular step 9. A downwardly disposed middle annular inner step 31 is provided between the second outer protruding edge 11 and the middle annular member 6. The middle annular member 6 is disposed in the middle annular inner step 31. The axial height of the inner end of the middle annular inner step 31 is different from the axial height of the bottom surface of the second outer protruding edge 11.

[0084] The second outer protrusion 11 at the upper end of the inner ring component 1 cooperates with the first inner ring step 9 at the upper end of the outer ring component 5 to achieve axial positioning, and the upper end of the middle ring component 6 abuts against the inner step 31 of the middle ring to achieve axial positioning.

[0085] The outer ring component 5, the middle ring component 6 and the inner ring component 1 are pressed together to form a sealing interface, which can avoid melt leakage due to sealing failure or stress concentration due to gaps. It can also ensure that heat is efficiently conducted through the contact surface, reduce contact thermal resistance and improve thermal conductivity.

[0086] Example 5

[0087] like Figure 7 As shown, the structure and working principle of this embodiment are basically the same as those of embodiment four. The difference is that the axial height of the inner end of the inner step 31 of the middle ring is the same as the axial height of the bottom surface of the second outer protrusion 11.

[0088] Example 6

[0089] like Figure 8As shown, the structure and working principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the inner wall of the middle annular component 6 is adapted to the outer wall of the inner annular component 1 and the outer wall of the outer annular component 5 respectively, and the upper end of the middle annular component 6 is flush with the upper end of the inner annular component 1; the axial positioning sealing structure 7 includes a third outer annular step 13 disposed on the upper end of the outer annular component 5, the lower end of the middle annular component 6 abuts against the third outer annular step 13, and the upper end of the outer annular component 5 abuts against the lower end of the third outer protrusion 14 on the upper end of the inner annular component 1;

[0090] The middle annular component 6 is fitted onto the inner annular component 1 and the outer annular component 5. The inner wall of the middle annular component 6 is tightly fitted with the outer wall of the inner annular component 1 and the outer wall of the outer annular component 5, respectively, which can eliminate radial gaps and prevent the melt from penetrating into the non-contact area.

[0091] Axial positioning is achieved by the direct contact between the third outer annular step 13 and the lower end of the middle annular component 6, and axial positioning is achieved by the upper end of the outer annular component 5 abutting against the lower end of the third outer protrusion 14 on the upper end of the inner annular component 1.

[0092] Example 7

[0093] like Figure 9 As shown, the structure and working principle of this embodiment are basically the same as those of embodiment four. The difference is that the axial positioning sealing structure 7 includes a third outer annular step 13 provided on the upper end of the outer annular member 5, and a third inner annular step 15 provided on the lower end of the middle annular member 6 that can cooperate with the third outer annular step 13. The upper end of the outer annular member 5 abuts against the lower end of the third outer protrusion 14 on the upper end of the inner annular member 1.

[0094] The third inner ring step 15 at the lower end of the middle ring member 6 cooperates with the third outer ring step 13 to achieve axial positioning, and the upper end of the outer ring member 5 abuts against the lower end of the third outer protrusion 14 at the upper end of the inner ring member 1 to achieve axial positioning.

[0095] Example 8

[0096] like Figure 10 As shown, the structure and working principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the axial positioning sealing structure 7 includes a fourth outer protrusion 16 provided on the upper end of the inner annular member 1, a fifth outer protrusion 17 provided on the upper end of the outer annular member 5, and the upper and lower ends of the middle annular member 6 respectively abut against the lower end of the fourth outer protrusion 16 and the upper end of the fifth outer protrusion 17. The outer wall of the inner annular member 1 is adapted to the inner wall of the outer annular member 5 and the inner wall of the middle annular member 6 respectively.

[0097] The upper and lower ends of the middle ring component 6 abut against the lower end of the fourth outer convex edge 16 and the upper end of the fifth outer convex edge 17 respectively to achieve axial positioning.

[0098] Example 9

[0099] like Figure 11 As shown, the structure and working principle of this embodiment are basically the same as those of Embodiment 1. The difference is that an anti-lag ring 21 is provided on the lower outer wall of the inner annular component 1, and the lower outlet of the melt channel 4 is located above the lower outlet of the anti-lag ring 21, forming a secondary connection channel 22 between the lower outlet of the melt channel 4 and the lower outlet of the anti-lag ring 21.

[0100] The secondary connection channel 22 formed between the lower outlet of the melt channel 4 and the lower outlet of the anti-stagnant ring 21 can guide the melt to flow in a concentrated manner, avoid stagnation, prevent plastic residue, and meet the hygiene requirements of food and medical grade.

[0101] Specifically, combining Figure 9 As shown, the lower outer wall of the inner ring component 1 is provided with at least one sixth outer ring step 23, and the inner wall of the anti-locking ring 21 is provided with a sixth inner ring step 24 that can cooperate with the sixth outer ring step 23; the lower outer wall of the inner ring component 1 is provided with at least one seventh outer ring step 25, and the inner wall of the anti-locking ring 21 is provided with a seventh inner ring step 26 that can cooperate with the seventh outer ring step 25.

[0102] The sixth inner annular step 24 on the inner wall of the anti-locking ring 21 cooperates with the sixth outer annular step 23 on the lower outer wall of the inner annular component 1 to achieve axial positioning. The seventh outer annular step 25 on the inner wall of the anti-locking ring 21 cooperates with the seventh outer annular step 25 on the lower outer wall of the inner annular component 1 to achieve axial positioning. Through multi-level positioning, multiple sealing interfaces are formed, which block the melt penetration path step by step, significantly improving the sealing effect. The multiple sealing interfaces can disperse the injection pressure and thermal expansion stress, avoiding single-point sealing failure.

[0103] Example 10

[0104] like Figure 12 As shown, the structure and working principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the lower end of the inner ring component 1 is far away from the lower end of the outer ring component 5, and the lower end of the middle ring component 6 is close to the lower end of the inner ring component 1.

[0105] The central ring component 6 can be further extended to be closer to the gate, which can enhance the local heating effect and adapt to different gate types.

[0106] 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.

[0107] Although this article frequently uses terms such as inner annular component 1, gate 2, nozzle 3, melt channel 4, outer annular component 5, middle annular component 6, axial positioning sealing structure 7, outer axial positioning structure 8, first inner annular step 9, first outer convex edge 10, second outer convex edge 11, extension ring 12, third outer annular step 13, third outer convex edge 14, third inner annular step 15, fourth outer convex edge 16, fifth outer convex edge 17, outer annular positioning step 18, anti-locking ring 21, secondary connection channel 22, sixth outer annular step 23, sixth inner annular step 24, seventh outer annular step 25, seventh inner annular step 26, mold body 27, nozzle body 28, end ring 29, valve needle 30, middle annular inner step 31, etc., these terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A hot tip core, characterized by, The inner ring member (1) is provided with a melt channel (4) in the center for connecting the flow channel of the nozzle (3) and the sprue (2), the outer ring member (5) is sleeved outside the inner ring member (1), the middle ring member (6) is arranged between the outer ring member (5) and the inner ring member (1) for preventing melt leakage, the axial positioning sealing structure (7) is arranged between the middle ring member (6) and the inner ring member (1) and the outer ring member (5), and the outer wall of the outer ring member (5) is provided with the outer axial positioning structure (8).

2. The hot tip core of claim 1, wherein, The inner wall and the outer wall of the middle ring member (6) are respectively matched with the outer wall of the inner ring member (1) and the inner wall of the outer ring member (5).

3. The hot tip core of claim 2, wherein, The axial positioning sealing structure (7) comprises a first inner annular step (9) arranged on the upper end of the outer ring member (5), the upper end of the middle ring member (6) is provided with a first outer convex edge (10) matched with the first inner annular step (9), The upper end of the inner ring member (1) is provided with a second outer convex edge (11), and the upper end of the middle ring member (6) is abutted on the second outer convex edge (11), The outer ring member (5), the middle ring member (6) and the inner ring member (1) are mutually adhered.

4. The hot tip core of claim 3, wherein, The upper end of the outer ring member (5) is flush with the upper end of the inner ring member (1), and the outer wall of the second outer convex edge (11) is abutted on the inner wall of the first inner annular step (9); Alternatively, the upper end of the outer ring member (5) is flush with the upper end of the inner ring member (1), the upper end of the first outer convex edge (10) is provided with an extension ring (12) located between the outer wall of the second outer convex edge (11) and the inner wall of the first inner annular step (9), and the inner wall and the outer wall of the extension ring (12) are respectively close to the outer wall of the second outer convex edge (11) and the inner wall of the first inner annular step (9).

5. The hot tip core of claim 1 wherein, The axial positioning sealing structure (7) comprises a first inner annular step (9) arranged on the upper end of the outer ring member (5), the upper end of the inner ring member (1) is provided with a second outer convex edge (11) capable of being matched with the first inner annular step (9), a middle annular inner step (31) downwardly arranged is arranged between the second outer convex edge (11) and the middle ring member (6), the middle ring member (6) is arranged in the middle annular inner step (31), and the axial height of the inner end of the middle annular inner step (31) is same or different from the axial height of the bottom surface of the second outer convex edge (11).

6. The hot tip core of claim 1 wherein, The inner wall and the outer wall of the middle ring member (6) are respectively matched with the outer wall of the inner ring member (1) and the outer wall of the outer ring member (5), and the upper end of the middle ring member (6) is flush with the upper end of the inner ring member (1).

7. The hot tip core of claim 6, wherein, The axial positioning sealing structure (7) comprises a third outer annular step (13) arranged on the upper end of the outer ring member (5), the lower end of the middle ring member (6) is abutted on the third outer annular step (13), and the upper end of the outer ring member (5) is abutted on the lower end of a third outer convex edge (14) of the upper end of the inner ring member (1); Or, the axial positioning sealing structure (7) comprises a third outer annular step (13) arranged on the upper end of the outer annular member (5), and the lower end of the middle annular member (6) is provided with a third inner annular step (15) capable of cooperating with the third outer annular step (13), and the upper end of the outer annular member (5) abuts against the lower end of a third outer convex edge (14) on the upper end of the inner annular member (1).

8. The hot tip core of claim 1 wherein, The axial positioning sealing structure (7) comprises a fourth outer convex edge (16) arranged on the upper end of the inner annular member (1), and the upper end of the outer annular member (5) is provided with a fifth outer convex edge (17), and the upper and lower ends of the middle annular member (6) abut against the lower end of the fourth outer convex edge (16) and the upper end of the fifth outer convex edge (17) respectively, and the outer wall of the inner annular member (1) is adapted to the inner wall of the outer annular member (5) and the inner wall of the middle annular member (6) respectively.

9. The hot tip core of any of claims 1-8, wherein, The outer axial positioning structure (8) comprises an outer annular positioning step (18) arranged on the lower end of the outer wall of the outer annular member (5), any one or more of an annular taper on the outer wall of the outer annular member (5) or an annular arc surface on the outer wall of the outer annular member (5).

10. The hot tip core of any of claims 1-8, wherein, The outer wall of the lower end of the inner annular member (1) is provided with a stagnation prevention ring (21), and the lower end outlet of the melt passage (4) is located above the lower end outlet of the stagnation prevention ring (21), and a secondary connecting passage (22) is formed between the lower end outlet of the melt passage (4) and the lower end outlet of the stagnation prevention ring (21).

11. The hot tip core of claim 10, wherein, The outer wall of the lower end of the inner annular member (1) is provided with at least one sixth outer annular step (23), and the inner wall of the stagnation prevention ring (21) is provided with a sixth inner annular step (24) capable of cooperating with the sixth outer annular step (23).

12. The hot tip core of claim 11, wherein, The outer wall of the lower end of the inner annular member (1) is provided with at least one seventh outer annular step (25), and the inner wall of the stagnation prevention ring (21) is provided with a seventh inner annular step (26) capable of cooperating with the seventh outer annular step (25).

13. The hot tip core of any of claims 1-8, wherein, The inner annular member (1), the middle annular member (6) and the outer annular member (5) are made of materials with different thermal conductivities. Or, the inner annular member (1), the middle annular member (6) and the outer annular member (5) are made of materials with similar thermal conductivities.

14. The hot tip core of claim 13, wherein, The thermal conductivity of the outer annular member (5) is less than that of the inner annular member (1), and the thermal conductivity of the inner annular member (1) is less than that of the middle annular member (6).

15. The hot tip core of any of claims 1-8, wherein, The lower end of the inner annular member (1) is away from the lower end of the outer annular member (5), and the lower end of the middle annular member (6) is close to the lower end of the outer annular member (5). Or, the lower end of the inner annular member (1) is away from the lower end of the outer annular member (5), and the lower end of the middle annular member (6) is close to the lower end of the inner annular member (1).

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