Simple hot nozzle structure

Abstract

The utility model relates to the technical field of hot runner, specifically disclose a simple hot nozzle structure. It is installed between the hot runner board and the shunt board, the shunt board is equipped with feed runner, including nozzle core, sprue bushing and insert piece, one end of insert piece is tightly contacted with hot runner board, the other end is tightly contacted with sprue bushing, sprue bushing is equipped with nozzle core outside and tightly contacts nozzle core with shunt board, nozzle core is equipped with melt runner that communicates with feed runner, the import end of nozzle core is contacted with shunt board, the outlet end of nozzle core forms annular gap with hot runner board inner chamber, the rear end of annular gap is sealed by sprue bushing, the front end of annular gap is formed to the hot runner board outside and forms sprue. The simple hot nozzle structure of the utility model cancels the body of traditional hot nozzle and heater, reduces the number of fittings under the premise of guaranteeing nozzle core temperature, thereby greatly reduces the production cost.

Description

Technical Field

[0001] This utility model relates to the technical field of hot runners, and specifically discloses a simplified hot nozzle structure. Background Technology

[0002] The hot runner nozzle is the final actuator of the hot runner system. Its function is to maintain the molten plastic in the manifold at a constant temperature and accurately inject it into the mold cavity. The structural performance of the hot runner nozzle directly determines the gate quality, color change efficiency, and the energy consumption level of the entire hot runner system, hence it is known as the "heart of the hot runner".

[0003] Currently, traditional hot runner structures typically include multiple parts such as the body, runner core, sprue sleeve, retaining ring, protective cap, and heater. Figure 1 The main body must not only provide structural support but also house heating and temperature sensing elements, as well as fabricate multiple cooling or insulation channels, resulting in a large number of parts, complex manufacturing processes, and high material consumption. Furthermore, multiple thermal interfaces exist between the heater and the main body, and between the main body and the hot nozzle, leading to high thermal resistance, slow heating, and significant heat loss. The increased number of components not only raises procurement and assembly costs but also increases the risk of failure and maintenance difficulty, making it difficult to meet the current injection molding industry's demands for lightweight, low-cost, and rapid delivery. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a simple hot nozzle structure.

[0005] This utility model discloses a simplified hot nozzle structure, which adopts the following technical solution:

[0006] A simplified hot nozzle structure is installed between a manifold and a hot runner plate. The manifold has a feed channel and includes a nozzle core, a sprue sleeve, and an insert. One end of the insert abuts against the hot runner plate, and the other end abuts against the sprue sleeve. The sprue sleeve is fitted over the nozzle core and presses the nozzle core against the manifold. The nozzle core has a melt channel communicating with the feed channel. The inlet end of the nozzle core contacts the manifold, and the outlet end of the nozzle core forms an annular gap with the inner cavity of the hot runner plate. The rear end of the annular gap is sealed by the sprue sleeve, and the front end of the annular gap extends to the outside of the hot runner plate to form a sprue.

[0007] Preferably, the end face of the sprue bushing is in contact with the manifold.

[0008] Preferably, the top surface of the sprue bushing is provided with a boss, the boss is in contact with the manifold, and the recessed end face formed on the outer periphery of the boss forms an axial gap with the manifold.

[0009] Preferably, the gate sleeve forms a radial seal with the sidewall of the hot runner plate cavity, and the lower end face of the gate sleeve forms an axial gap with the corresponding end face of the hot runner plate cavity.

[0010] Preferably, the outer periphery of the nozzle core is provided with a nozzle core shoulder, and the gate sleeve is provided with a gate sleeve stop step that matches and abuts against the nozzle core shoulder.

[0011] Preferably, the melt flow channel includes a main flow channel and several branch flow channels. The main flow channel extends axially along the nozzle core to communicate with the feed flow channel, and the several branch flow channels are spaced apart at the outlet end of the nozzle core and communicate with the branch flow channels.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] The simplified hot nozzle structure of this utility model eliminates the traditional hot nozzle body and heater. The nozzle core, sprue sleeve, and inserts share the supporting, fixing, and sealing functions originally performed by the body. The nozzle core is in direct contact with the manifold, and the heat from the manifold can be quickly transferred to the nozzle core to compensate for its heat loss and keep the head temperature above the melt solidification point, preventing the melt from cooling and solidifying inside the nozzle core. Therefore, there is no need to set up an additional heater. While ensuring the nozzle core temperature, the number of accessories is reduced, thereby significantly reducing production costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a hot runner structure in the prior art;

[0015] Figure 2 This is a simplified schematic diagram of the hot nozzle structure in this embodiment;

[0016] Figure 3 for Figure 2 Enlarged view of A;

[0017] Figure 4 This is a perspective view of the simplified hot nozzle structure of this embodiment;

[0018] Figure 5 This is an exploded view of the simplified hot nozzle structure in this embodiment.

[0019] Explanation of icon numbers:

[0020] 1. Manifold; 11. Feed channel; 2. Hot runner plate; 3. Nozzle; 31. Melt channel; 311. Main runner; 312. Sub-runner; 32. Nozzle shoulder; 4. Sprue bushing; 41. Boss; 42. Sprue bushing stop step; 43. Sprue bushing shoulder; 5. Insert; 51. Insert stop step; 6. Sprue; 7. Body; 8. Heater. Detailed Implementation

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] This embodiment discloses a simplified hot nozzle structure, referring to... Figure 2-5 It is installed between the manifold 1 and the hot runner plate 2, and includes a nozzle 3, a sprue sleeve 4, and an insert 5; one end of the insert 5 is pressed against the hot runner plate 2, and the other end is pressed against the sprue sleeve 4; the sprue sleeve 4 is fitted over the nozzle 3 and presses the nozzle 3 against the manifold 1; the manifold 1 has a feed channel 11, and the nozzle 3 has a melt channel 31 communicating with the feed channel 11; the inlet end of the nozzle 3 contacts the manifold 1, and the outlet end of the nozzle 3 forms an annular gap with the inner cavity of the hot runner plate 2; the rear end of the annular gap is sealed by the sprue sleeve 4, and the front end of the annular gap extends to the outside of the hot runner plate 2 to form a sprue 6. Figure 1-2 The structure of this design eliminates the traditional hot nozzle body 7 and heater 8. The nozzle core 3 and the sprue sleeve 4 share the functions originally performed by the body 7, including structural support, fixing function, thermal management and sealing. The nozzle core 3, sprue sleeve 4 and insert 5 are axially pressed in sequence, which not only ensures sealing but also minimizes the number of assembly parts, significantly reducing material and processing costs. Through the direct contact between the nozzle core 3 and the manifold 1, the heat of the manifold 1 is transferred to the nozzle core 3, ensuring the temperature of the nozzle core 3 head and preventing the melt from cooling and solidifying inside the nozzle core. This reduces the number of hot nozzle accessories while maintaining a sufficient temperature of the nozzle core 3, thus reducing production costs.

[0023] As a preferred option, the upper end face of the sprue sleeve 4 contacts the manifold 1, so that the heat of the manifold 1 can be transferred to the sprue sleeve 4 through contact, and then radiated inward from the sprue sleeve 4 to the outer periphery of the nozzle core 3. In the absence of a heater, the nozzle core 3 can better maintain a temperature higher than the solidification point of the melt, further improving the reliable heat preservation effect under the "no heater" condition.

[0024] As a preferred embodiment, the top surface of the sprue bushing 4 is provided with a boss 41, which contacts the manifold 1. The recessed end face formed on the outer periphery of the boss 41 forms an axial gap with the manifold 1. This axial gap provides compensation for thermal expansion, avoids overpressure deformation of the end face during high-temperature operation, and maintains the necessary sealing pressure to extend service life.

[0025] As a preferred embodiment, the gate sleeve 4 forms a radial seal with the side wall of the inner cavity of the hot runner plate 2, and the lower end face of the gate sleeve 4 forms an axial gap with the corresponding end face of the inner cavity of the hot runner plate 2. By adopting the above design, the radial sealing line can prevent melt leakage, while the reserved axial gap is also used to absorb thermal expansion, prevent thermal jamming, and ensure smooth disassembly and assembly.

[0026] As a preferred embodiment, the outer periphery of the nozzle core 3 is provided with a nozzle core shoulder 32, and the sprue sleeve 4 is provided with a sprue sleeve stop step 42 that matches and abuts against the nozzle core shoulder 32. The shoulder-stop fit provides precise axial positioning for the nozzle core, and the injection impact force is transmitted to the sprue sleeve 4 through the nozzle core shoulder 32, avoiding excessive cantilever deformation of the nozzle core and ensuring the concentricity of the sprue.

[0027] As a preferred embodiment, the outer periphery of the sprue sleeve 4 is provided with a sprue sleeve shoulder 43, and the insert 5 is fitted outside the sprue sleeve 4 and is provided with an insert stop step 51 that matches and abuts against the sprue sleeve shoulder 43. By adopting the above design, the clamping force of the insert 5 on the sprue sleeve 4 is evenly distributed along the circumference, preventing local stress concentration.

[0028] As a preferred embodiment, the melt flow channel 31 includes a main flow channel 311 and several branch flow channels 312. The main flow channel 311 extends axially along the nozzle core 3 to communicate with the feed flow channel 11, and the several branch flow channels 312 are spaced apart at the outlet end of the nozzle core 3 and communicate with the main flow channel 311. The multiple branch flow channels 312 pre-distribute the melt evenly in the circumferential direction before it enters the annular gap. This design can significantly optimize the flow and distribution of the melt, control the melt temperature, reduce melt shear stress, improve mold life, enhance structural stability, and reduce the risk of material leakage.

[0029] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A simplified hot runner structure, installed between a manifold and a hot runner plate, wherein the manifold is provided with a feed channel, characterized in that, This includes the nozzle core, gate sleeve, and inserts; One end of the insert abuts against the hot runner plate, and the other end abuts against the gate sleeve; The gate sleeve is fitted over the nozzle core and presses the nozzle core against the flow divider plate; The nozzle core is provided with a melt flow channel communicating with the feed flow channel. The inlet end of the nozzle core is in contact with the manifold plate, and the outlet end of the nozzle core forms an annular gap with the inner cavity of the hot runner plate. The rear end of the annular gap is sealed by the gate sleeve, and the front end of the annular gap extends to the outside of the hot runner plate to form a gate.

2. The simplified hot runner structure according to claim 1, characterized in that, The end face of the sprue bushing is in contact with the manifold.

3. The simplified hot runner structure according to claim 2, characterized in that, The top surface of the sprue bushing is provided with a boss, which contacts the manifold plate, and the recessed end face formed on the outer periphery of the boss forms an axial gap with the manifold plate.

4. The simplified hot runner structure according to claim 1 or 2, characterized in that, The sprue bushing forms a radial seal with the side wall of the hot runner plate cavity, and the lower end face of the sprue bushing forms an axial gap with the corresponding end face of the hot runner plate cavity.

5. The simplified hot nozzle structure according to claim 1, characterized in that, The outer periphery of the nozzle core is provided with a nozzle core shoulder, and the gate sleeve is provided with a gate sleeve stop step that matches and abuts against the nozzle core shoulder.

6. The simplified hot nozzle structure according to claim 1, characterized in that, The outer periphery of the sprue sleeve is provided with a sprue sleeve shoulder, and the insert is sleeved outside the sprue sleeve and is provided with an insert stop step that matches and abuts against the sprue sleeve shoulder.

7. The simplified hot nozzle structure according to claim 1, characterized in that, The melt flow channel includes a main flow channel and several branch flow channels. The main flow channel extends axially along the nozzle core to communicate with the feed flow channel. The several branch flow channels are spaced apart at the outlet end of the nozzle core and communicate with the branch flow channels.

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