Novel hot nozzle core
By using a multi-stage sealing structure with an inner ring component and an anti-hysteresis ring, the problem of melt leakage in the traditional hot nozzle core is solved, achieving high-efficiency food and medical-grade hygiene standards, and improving production efficiency and thermal conductivity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional hot runner cores have their melt channel outlet directly exposed to the gate area, which makes it easy for the melt to seep into the assembly gaps under high pressure, forming non-flowing dead zones, resulting in plastic residue and contamination of the products, failing to meet food and medical grade hygiene requirements.
The combination of inner ring components and anti-lag rings forms a multi-level sealing interface, blocking the melt retention path, and the outer ring components provide support and heat conduction to ensure smooth melt flow and avoid plastic residue.
It meets food and medical-grade hygiene requirements, reduces plastic residue and leakage risks, improves production efficiency, and reduces cleaning frequency.
Smart Images
Figure CN224060356U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of hot runner systems for injection molds, and relates to a novel hot runner core. Background Technology
[0002] The hot runner nozzle core, as a key component for transferring melt from the nozzle to the mold cavity, directly affects molding efficiency and product quality. However, traditional hot runner nozzle cores are mostly composed of a single inner ring component. The melt channel outlet of this single inner ring component is directly exposed to the gate area. Under high pressure, the melt easily seeps into the assembly gap between the lower end of the inner ring component and the gate, forming a non-flowing dead zone. During the subsequent cooling process, the melt in the gap solidifies due to the sudden drop in temperature, leading to the gradual accumulation of residual plastic. The volatile organic compounds released by the residual plastic can contaminate the product, resulting in substandard biocompatibility for food and medical-grade hygiene products. Utility Model Content
[0003] The purpose of this invention is to address the above-mentioned problems by providing a novel hot nozzle core.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A novel hot nozzle core includes an inner annular component. The inner annular component has a melt channel at its center for connecting the gate and the nozzle flow channel. The lower end of the inner annular component has an anti-lag ring that is axially positioned and connected to it. A connecting channel is formed between the first outlet at the lower end of the melt channel and the second outlet at the lower end of the anti-lag ring.
[0006] The anti-locking ring can seal the gate area and block the path of melt retention. After the melt flows out from the melt channel, it can be directly injected into the gate through the connecting channel. It can prevent the melt from entering the gap between the anti-locking ring and the inner ring component, thus preventing melt retention and plastic residue. It can meet the hygiene requirements of food and medical grade, and there is no need to frequently stop the machine to clean the residual plastic, which can effectively improve production efficiency.
[0007] In the aforementioned novel hot nozzle core, the lower end of the inner annular component is provided with N first outer annular steps distributed axially upward, and N≥1. The inner wall of the anti-lag ring is provided with a first inner annular step that can cooperate with the first outer annular step, and the first inner annular step corresponds one-to-one with the first outer annular step.
[0008] The first inner annular step on the inner wall of the anti-lock ring cooperates with the first outer annular step on the lower outer wall of the inner annular component to achieve axial positioning. Through multi-level positioning, multiple sealing interfaces are formed, which block the melt penetration path step by step, which can significantly improve the sealing effect. The multiple sealing interfaces can disperse the injection pressure and thermal expansion stress, and avoid single-point sealing failure.
[0009] In the aforementioned novel hot nozzle core, the outer diameter of the anti-hysteresis ring gradually increases from the outer end to the inner end. An axially extending boss with the same inner diameter is provided on the outer end of the anti-hysteresis ring. The boss is integrated with the anti-hysteresis ring, and the connecting channel is formed between the anti-hysteresis ring and the boss.
[0010] The boss extends axially from the outer end of the anti-locking ring, pushing the second outlet close to the gate. The melt is confined to flow within the connecting channel, which can physically isolate the assembly gap between the anti-locking ring and the inner ring component, preventing melt stagnation and plastic residue.
[0011] In the aforementioned novel hot nozzle core, the outer end of the boss is provided with an annular inclined surface.
[0012] The annular inclined surface at the outer end of the boss matches the inner conical surface of the gate.
[0013] In the aforementioned novel hot nozzle core, an outer annular component is sleeved on the outer side of the inner annular component, and the outer wall of the inner annular component is adapted to the inner wall of the outer annular component. An axial positioning sealing structure is provided between the inner annular component and the outer annular component, and an outer axial positioning structure is provided on the outer wall of the outer annular component.
[0014] The inner annular component's outer wall and the outer annular component's inner wall are tightly fitted together to form an axial seal, which eliminates the gap between the inner and outer annular components, prevents the melt from penetrating into non-contact areas, and reduces the risk of leakage. In addition, the tightly fitted sealing contact surface can also ensure that heat is efficiently conducted through the contact surface, which can reduce contact thermal resistance and improve thermal conductivity. The outer annular component is used to provide external support. The outer annular component cooperates with the mold body through an external axial positioning structure to ensure overall positioning.
[0015] In the aforementioned novel hot nozzle core, the lower end of the outer annular component and the anti-hysteresis ring are provided with M second outer annular steps distributed axially upward, and M≥1. The inner wall of the anti-hysteresis ring is provided with a second inner annular step that can cooperate with the second outer annular step, and the second inner annular step corresponds one-to-one with the second outer annular step.
[0016] The second inner annular step on the inner wall of the anti-hysteresis ring cooperates with the second outer annular step on the lower outer wall of the outer annular component to achieve axial positioning, which can limit the displacement of the anti-hysteresis ring. Through multi-level positioning, multiple sealing interfaces are formed, which block the melt penetration path step by step, and can significantly improve the sealing effect.
[0017] In the aforementioned novel hot nozzle core, the axial positioning sealing structure includes a first outer protrusion disposed on the upper end of the inner annular member, and the upper end of the outer annular member abuts against the lower end of the first outer protrusion.
[0018] The first outer protruding edge serves as an axial stop surface. The upper end of the outer annular component is pressed tightly against the lower end of the first outer protruding edge to form a seal, which can prevent the melt from penetrating into the non-contact area, reduce the risk of leakage, and the outer annular component is easy to assemble.
[0019] In the aforementioned novel 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.
[0020] 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.
[0021] In the aforementioned novel hot nozzle core, the thermal conductivity of the outer annular component is greater than that of the inner annular component.
[0022] Alternatively, the inner annular component may be made of wear-resistant material, corrosion-resistant material, or a combination of wear-resistant and corrosion-resistant material.
[0023] The thermal conductivity of the outer annular component is greater than that of the inner annular component. The outer annular component can quickly absorb the heat from the nozzle and quickly transfer the heat to the anti-lag ring.
[0024] The inner annular component is in direct contact with the melt and is made of wear-resistant, corrosion-resistant, or wear-resistant and corrosion-resistant materials, thus eliminating the need for easily peelable coatings.
[0025] In the aforementioned novel hot nozzle core, the lower end of the outer annular component is close to the lower end of the inner annular component;
[0026] Alternatively, the lower end of the outer annular component may be located away from the lower end of the inner annular component.
[0027] The lower end of the outer ring component can be further extended to be closer to the gate, which can enhance the local heating effect and adapt to different gate types.
[0028] Compared with existing technologies, the advantages of this invention are: 1. The anti-locking ring can seal the gate area, block the melt retention path, prevent melt retention, prevent plastic residue, and meet food and medical-grade hygiene requirements. 2. It eliminates the need for frequent machine shutdowns to clean retained plastic, effectively improving production efficiency. 3. It prevents melt from penetrating into non-contact areas, reducing the risk of leakage. Attached Figure Description
[0029] Figure 1 This is a diagram showing the usage status of the new type of hot nozzle core;
[0030] Figure 2 This is a schematic diagram of the structure of the new type of hot nozzle core;
[0031] Figure 3 This is a cross-sectional view of the new type of hot nozzle core;
[0032] Figure 4 This is a cross-sectional view of the anti-lag ring at the lower end of the inner annular component;
[0033] Figure 5 This is a cross-sectional view of the anti-locking ring at the lower end of the inner annular component in Embodiment 2.
[0034] In the figure, the components are: inner annular component 1, gate 2, nozzle 3, melt channel 4, anti-lag ring 5, first outlet 6, second outlet 7, connecting channel 8, second inlet 9, first outer annular step 10, first inner annular step 11, boss 12, annular inclined surface 13, inner conical surface 14, outer annular component 15, axial positioning sealing structure 16, outer axial positioning structure 17, second outer annular step 18, second inner annular step 19, first outer protrusion 20, outer annular positioning step 21, mold body 22, end ring 24, and valve needle 25. Detailed Implementation
[0035] Example 1
[0036] like Figures 1-4 As shown, a novel hot runner core includes an inner annular component 1. The inner annular component 1 has a melt channel 4 at its center for connecting the gate 2 and the nozzle 3 flow channel. The lower end of the inner annular component 1 has an anti-lag ring 5 axially positioned and connected to it. A connecting channel 8 is formed between a first outlet 6 at the lower end of the melt channel 4 and a second outlet 7 at the lower end of the anti-lag ring 5. That is, the melt flowing out of the first outlet 6 flows out sequentially through a second inlet 9, the connecting channel 8, and the second outlet 7.
[0037] In this invention, the inner annular component 1 directly contacts the melt, which flows along the melt channel 4. After flowing out of the first outlet 6 of the melt channel 4, the melt is introduced into the second inlet 9 of the anti-lag ring 5 and then guided to the second outlet 7 of the anti-lag ring 5 via the connecting channel 8. The melt is then directly injected into the gate 2 via the connecting channel 8.
[0038] The anti-locking ring 5 can seal the area of the gate 2 and block the path of melt retention. After the melt flows out from the melt channel 4, it can be directly injected into the gate 2 through the connecting channel 8. It can prevent the melt from entering the gap between the anti-locking ring 5 and the inner ring component 1, thus preventing melt retention and plastic residue. It can meet the hygiene requirements of food and medical grade, and there is no need to frequently stop the machine to clean the retained plastic, which can effectively improve production efficiency.
[0039] Specifically, combining Figure 4As shown, the lower end of the inner ring component 1 is provided with N first outer ring steps 10 distributed axially upward, and N≥1. The inner wall of the anti-locking ring 5 is provided with a first inner ring step 11 that can cooperate with the first outer ring step 10, and the first inner ring step 11 corresponds one-to-one with the first outer ring step 10.
[0040] The first inner annular step 11 on the inner wall of the anti-hysteresis ring 5 cooperates with the first outer annular step 10 on the lower outer wall of the inner annular component 1 to achieve axial positioning, which can limit the displacement of the anti-hysteresis ring 5. In addition, the cooperation of the first inner annular step 11 and the first outer annular step 10 can achieve radial sealing, and multiple sealing interfaces are formed through multi-level positioning, which blocks the melt penetration path step by step, which can significantly improve the sealing effect. The multiple sealing interfaces can disperse the injection pressure and thermal expansion stress, and avoid single-point sealing failure.
[0041] Specifically, combining Figure 4 As shown, the outer diameter of the anti-locking ring 5 gradually increases from the outer end to the inner end. A boss 12 with the same inner diameter is provided on the outer end of the anti-locking ring 5. The boss 12 is integrated with the anti-locking ring 5, and the connecting channel 8 is formed between the anti-locking ring 5 and the boss 12. An annular inclined surface 13 is provided on the outer end of the boss 12.
[0042] The boss 12 extends axially from the outer end of the anti-locking ring 5, pushing the second outlet 7 close to the gate 2. The melt is confined to the connecting channel 8, which can physically isolate the assembly gap between the anti-locking ring 5 and the inner annular component 1, avoid melt retention and prevent plastic residue. The annular inclined surface 13 at the outer end of the boss 12 matches the inner conical surface 14 of the gate 2.
[0043] Specifically, combining Figures 1-3 As shown, an outer ring component 15 is sleeved on the outer side of the inner ring component 1, and the outer wall of the inner ring component 1 is adapted to the inner wall of the outer ring component 15. An axial positioning sealing structure 16 is provided between the inner ring component 1 and the outer ring component 15, and an outer axial positioning structure 17 is provided on the outer wall of the outer ring component 15.
[0044] The inner annular component 1 and the outer annular component 15 are tightly fitted together to form an axial seal, which can eliminate the gap between the inner annular component 1 and the outer annular component 15, prevent the melt from penetrating into the non-contact area, and reduce the risk of leakage. In addition, the tightly fitted sealing contact surface can also ensure that heat is efficiently conducted through the contact surface, which can reduce contact thermal resistance and improve thermal conductivity. Furthermore, the double-layer annular structure forms prestress through the axial positioning sealing structure 16, which can enhance the resistance to plastic pressure. The outer annular component 15 is used to provide external support. The outer annular component 15 cooperates with the mold body 22 through the outer axial positioning structure 17 to ensure overall positioning.
[0045] Specifically, combining Figure 4As shown, the lower end of the outer ring component 15 is close to the lower end of the inner ring component 1. There are M second outer ring steps 18 distributed axially upward between the lower end of the outer ring component 15 and the anti-locking ring 5, and M≥1. The inner wall of the anti-locking ring 5 is provided with a second inner ring step 19 that can cooperate with the second outer ring step 18, and the second inner ring step 19 corresponds to the second outer ring step 18 one by one.
[0046] The lower end of the outer ring component 15 can be further extended to be closer to the gate 2, which can enhance the local heating effect and adapt to different gate types.
[0047] The second inner annular step 19 on the inner wall of the anti-hysteresis ring 5 cooperates with the second outer annular step 18 on the lower outer wall of the outer annular component 15 to achieve axial positioning, which can limit the displacement of the anti-hysteresis ring 5. Through multi-level positioning, multiple sealing interfaces are formed, which block the melt penetration path step by step, which can significantly improve the sealing effect. The multiple sealing interfaces can disperse the injection pressure and thermal expansion stress, and avoid single-point sealing failure.
[0048] Preferably, the inner angles of the first inner annular step 11 and the second inner annular step 19 are arc-shaped or right-angled.
[0049] Specifically, combining Figures 1-3 As shown, the axial positioning sealing structure 16 includes a first outer protrusion 20 disposed on the upper end of the inner annular member 1, and the upper end of the outer annular member 15 abuts against the lower end of the first outer protrusion 20.
[0050] The first outer protruding edge 20 serves as an axial stop surface. The upper end of the outer annular component 15 is pressed tightly against the lower end of the first outer protruding edge 20 to form a seal, which can prevent the melt from penetrating into the non-contact area, reduce the risk of leakage, and the outer annular component 15 is easy to assemble.
[0051] Specifically, combining Figures 1-3 As shown, the outer axial positioning structure 17 includes any one or more of the following: an outer annular positioning step 21 disposed at the lower end of the outer wall of the outer annular member 15, an annular conical surface on the outer wall of the outer annular member 15, or an annular arcuate surface on the outer wall of the outer annular member 15.
[0052] In this embodiment, the outer axial positioning structure 17 includes an outer annular positioning step 21 disposed at the lower end of the outer wall of the outer annular member 15.
[0053] By cooperating with the mold body 22 through the outer annular positioning step 21 at the lower end of the outer wall of the outer annular component 15, rapid installation and positioning can be achieved, and thermal expansion can be accommodated, thereby improving assembly accuracy.
[0054] Preferably, combined with Figures 1-4 As shown, the thermal conductivity of the outer annular component 15 is greater than that of the inner annular component 1.
[0055] Alternatively, the inner ring component 1 may be made of wear-resistant material, corrosion-resistant material, or wear-resistant and corrosion-resistant material.
[0056] The outer annular component 15 has a higher thermal conductivity than the inner annular component 1. The outer annular component 15 has a high thermal conductivity, enabling it to quickly absorb heat from the nozzle 3 and rapidly transfer it to the anti-lag ring 5, bypassing the inner annular component 1 for direct heating. The inner annular component 1 has a medium-to-high thermal conductivity and directly contacts the melt, balancing thermal conductivity and durability.
[0057] The inner annular component 1 is in direct contact with the melt and is made of wear-resistant, corrosion-resistant or wear-resistant and corrosion-resistant materials, thus eliminating the need for easily peelable coatings.
[0058] Specifically, combining Figure 1 As shown, the mold body 22 is provided with an installation groove adapted to the nozzle 3. The nozzle heater is arranged on the outer peripheral wall of the nozzle 3 in a spiral winding or segmented manner and achieves closed-loop temperature control through thermocouples (not shown in the figure). The new type of hot nozzle core is located at the inner bottom end of the nozzle 3. The upper end of the inner annular component 1 abuts and seals against the inner bottom end of the nozzle 3. An end ring 24 is screwed onto the outer wall of the outer annular component 15. The upper end of the end ring 24 abuts against the outer annular positioning step 21. The end ring 24 is used to fix the outer annular component 15. A valve needle 25 is provided in the melt channel 4 and the flow channel of the nozzle 3.
[0059] The working principle of this utility model is as follows: After the melt flows out from the first outlet 6 of the melt channel 4, it is introduced into the second inlet 9 of the anti-lag ring 5 and guided to the second outlet 7 of the anti-lag ring 5 through the connecting channel 8. The melt is directly injected into the gate 2 through the connecting channel 8, which can prevent the melt from entering the gap between the anti-lag ring 5 and the inner ring component 1, thus preventing melt retention and plastic residue. The outer wall of the inner ring component 1 and the inner wall of the outer ring component 15 are tightly fitted to form an axial seal, and the upper end of the outer ring component 15 is pressed tightly against the lower end of the first outer protrusion 20 to form a seal, which can prevent the melt from penetrating into the non-contact area.
[0060] Example 2
[0061] like Figure 5 The structure and working principle of this embodiment are basically the same as those of Embodiment 1, except that the lower end of the outer ring component 15 is far away from the lower end of the inner ring component 1.
[0062] 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.
[0063] Although this article frequently uses terms such as inner annular component 1, gate 2, nozzle 3, melt channel 4, anti-lag ring 5, first outlet 6, second outlet 7, connecting channel 8, second inlet 9, first outer annular step 10, first inner annular step 11, boss 12, annular inclined surface 13, inner conical surface 14, outer annular component 15, axial positioning sealing structure 16, outer axial positioning structure 17, second outer annular step 18, second inner annular step 19, first outer protruding edge 20, outer annular positioning step 21, mold body 22, end ring 24, valve pin 25, 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 novel hot nozzle tip comprising an inner annular member (1) having a melt channel (4) in the center for connecting the runner (2) and the nozzle (3) flow channels, characterized in that, The inner annular member (1) is provided with an anti-stagnation ring (5) connected with the axial positioning at the lower end, and a connecting channel (8) is formed between the first outlet (6) at the lower end of the melt channel (4) and the second outlet (7) at the lower end of the anti-stagnation ring (5).
2. The novel hot tip core of claim 1, wherein, The inner annular member (1) is provided with N first outer annular steps (10) distributed along the axial direction at the lower end, and N≥1, and the inner wall of the anti-stagnation ring (5) is provided with first inner annular steps (11) capable of cooperating with the first outer annular steps (10), and the first inner annular steps (11) correspond to the first outer annular steps (10) one by one.
3. The novel hot tip core according to claim 1 or 2, characterized in that, The outer diameter of the anti-stagnation ring (5) gradually increases from the outer end to the inner end, and a boss (12) extending axially and having the same inner diameter is arranged at the outer end of the anti-stagnation ring (5), and the boss (12) is integrated with the anti-stagnation ring (5), and the connecting channel (8) is formed between the anti-stagnation ring (5) and the boss (12).
4. The novel hot tip core of claim 3, wherein, The outer end of the boss (12) is provided with an annular inclined surface (13).
5. The novel hot tip core according to claim 1 or 2, characterized in that, The outer side of the inner annular member (1) is sleeved with an outer annular member (15), and the outer wall of the inner annular member (1) is adapted to the inner wall of the outer annular member (15), an axial positioning and sealing structure (16) is arranged between the inner annular member (1) and the outer annular member (15), and the outer wall of the outer annular member (15) is provided with an outer axial positioning structure (17).
6. The novel hot tip core of claim 5, wherein, The lower end of the outer annular member (15) and the anti-stagnation ring (5) are provided with M second outer annular steps (18) distributed along the axial direction, and M≥1, the inner wall of the anti-stagnation ring (5) is provided with second inner annular steps (19) capable of cooperating with the second outer annular steps (18), and the second inner annular steps (19) correspond to the second outer annular steps (18) one by one.
7. The novel hot tip core of claim 5, wherein, The axial positioning and sealing structure (16) comprises a first outer convex edge (20) arranged at the upper end of the inner annular member (1), and the upper end of the outer annular member (15) abuts against the lower end of the first outer convex edge (20).
8. The novel hot tip core of claim 5, wherein, The outer axial positioning structure (17) comprises an outer annular positioning step (21) arranged at the lower end of the outer wall of the outer annular member (15), an annular tapered surface on the outer wall of the outer annular member (15), or any one or more of an annular arc surface on the outer wall of the outer annular member (15).
9. The novel hot tip core of claim 5, wherein, The thermal conductivity of the outer annular member (15) is greater than that of the inner annular member (1). Alternatively, the inner annular member (1) is made of wear-resistant material, corrosion-resistant material or wear-resistant and corrosion-resistant material.
10. The novel hot tip core of claim 5, wherein, The lower end of the outer annular member (15) is close to the lower end of the inner annular member (1). Alternatively, the lower end of the outer annular member (15) is away from the lower end of the inner annular member (1).