A hot runner nozzle

Abstract

The utility model discloses a hot runner nozzle contains: nozzle body, mouth tip, pressure cap and valve needle, wherein, set up in the nozzle body is provided with injection cavity, mouth tip sets up in the injection cavity and is located the nozzle body front end, pressure cap is connected with nozzle body screw thread, is used for mouth tip fixed in the nozzle body, valve needle is worn and is established in the melt passageway of mouth tip, and valve needle can move along the axial movement, is used for controlling the injection and cut-off of melt, the utility model sets up multilayer leakproof adhesive structure, has improved the leakproofness of nozzle greatly, makes mouth tip not loose simultaneously, has reduced the overhaul frequency of nozzle, has saved the production cost greatly.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, and in particular to a hot runner nozzle. Background Technology

[0002] In hot runner injection molding systems, the nozzle is the core component connecting the hot runner and the mold cavity. Its structural stability and sealing performance directly affect the quality of the injection molded products and production efficiency. In existing hot runner nozzles, the nozzle tip is connected to the nozzle body by threads. After prolonged use, the nozzle tip may loosen, leading to glue leakage. Utility Model Content

[0003] According to an embodiment of the present invention, a hot runner nozzle is provided, comprising: The nozzle body contains a spray chamber. The nozzle tip is located inside the injection chamber and at the front end of the nozzle body; The pressure cap is threaded to the nozzle body and is used to fix the nozzle tip inside the nozzle body; A valve needle (existing technology) is inserted into the molten material channel at the tip of the nozzle. The valve needle can move axially and is used to control the injection and cutoff of molten material.

[0004] Furthermore, the nozzle body has an annular sealing part at the front end and an annular limiting part at the rear end of the pressure cap, with a gap between the front end of the sealing part and the limiting part of the pressure cap.

[0005] Furthermore, a first annular limiting step is provided inside the nozzle body, and the first annular limiting step is in close contact with the rear end face of the nozzle tip.

[0006] Furthermore, a first chamfer is provided at the rear end of the tip.

[0007] Furthermore, a second annular limiting step is provided in the middle of the tip of the mouth, and the second annular limiting step is in close contact with the front end of the pressure cap.

[0008] Furthermore, a third annular limiting step is provided in the middle of the tip of the mouth, and the cap is fitted on the third annular limiting step and is interference-fitted with the third annular limiting step.

[0009] Furthermore, a second chamfer is provided at the end of the third annular limiting step near the pressure cap.

[0010] Furthermore, the front end of the pressure cap is provided with a third chamfer, and the nozzle body is provided with a fourth annular limiting step. The pressure cap and the fourth annular limiting step are threaded together, and the front end of the fourth annular limiting step is provided with a fourth chamfer that matches the third chamfer.

[0011] Furthermore, the pressure cap is provided with a fifth annular limiting step, which is interference-fitted with the nozzle body. The nozzle body has a fifth chamfer at the front end, which facilitates the entry of the fifth annular limiting step into the nozzle body.

[0012] The hot runner nozzle according to the present invention has a multi-layer anti-leakage adhesive structure, which greatly improves the sealing performance of the nozzle, prevents the nozzle tip from loosening, reduces the maintenance frequency of the nozzle, and greatly saves production costs.

[0013] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0014] Figure 1 This is a perspective view schematic diagram according to an embodiment of the present utility model; Figure 2 for Figure 1 The main view; Figure 3 for Figure 2 Sectional view along axis AA; Figure 4 for Figure 3 Enlarged view of point A; Figure 5 for Figure 4 Enlarged view of point B; Figure 6 for Figure 4 Enlarged view of point C; Figure 7 for Figure 4 Enlarged view of point D; Figure 8 This is a cross-sectional view of the nozzle body according to an embodiment of the present invention; Figure 9 for Figure 8 Enlarged view of point E; Figure 10 This is a cross-sectional view of the tip of the mouth according to an embodiment of the present invention; Figure 11 This is a cross-sectional view of the pressure cap according to an embodiment of the present utility model. Detailed Implementation

[0015] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0016] First, combine Figures 1-11 The hot runner nozzle according to the embodiments of the present invention is used in injection molding equipment and has a wide range of applications.

[0017] like Figures 1-11As shown, the hot runner nozzle of this utility model embodiment includes: Nozzle body 1, with a spray chamber 11 provided inside the nozzle body 1; Nozzle tip 2 is disposed in the injection chamber 11 and located at the front end of the nozzle body 1, and is interference-fitted with the nozzle body 1; Pressure cap 3 is threadedly connected to nozzle body 1 and is used to fix nozzle tip 2 inside nozzle body 1; Valve needle 4 (which belongs to the prior art) is located inside the tip 2.

[0018] Furthermore, such as Figure 1 , 4 As shown in Figures 11 and 12, in this embodiment, the nozzle body 1 has an annular sealing part 12 at the front end and the pressure cap 3 has an annular limiting part 31 at the rear end. A gap is left between the front end of the sealing part 12 and the limiting part 31 of the pressure cap 3, so that the pressure cap 3 can better press the tip 2.

[0019] Furthermore, such as Figure 5 , 8 As shown, in this embodiment, a first annular limiting step 13 is provided inside the nozzle body 1. The first annular limiting step 13 is in close contact with the rear end face of the nozzle tip 2 to prevent the glue from leaking out between the nozzle body 1 and the nozzle tip 2 during the injection molding process.

[0020] Furthermore, such as Figure 5 , 10 As shown, in this embodiment, the rear end of the nozzle tip 2 is provided with a first chamfer 21 to facilitate the nozzle tip 2 entering the spray chamber 11.

[0021] Furthermore, such as Figure 6 , 10 As shown, in this embodiment, a second annular limiting step 22 is provided in the middle of the tip 2. The second annular limiting step 22 is in close contact with the front end of the pressure cap 3. The rotation of the pressure cap 3 can push the second annular limiting step 22 to move towards the first annular limiting step 13, so that the rear end of the tip 2 is in close contact with the first annular limiting step 13.

[0022] Furthermore, such as Figure 6 , 10 As shown, in this embodiment, a third annular limiting step 23 is also provided in the middle of the nozzle tip 2. The pressure cap 3 is sleeved on the third annular limiting step 23 and is interference-fitted with the third annular limiting step 23 to make the pressure cap 3 and the nozzle tip 2 sealed together, further preventing glue leakage.

[0023] Furthermore, such as Figure 6 , 10 As shown, in this embodiment, the third annular limiting step 23 is provided with a second chamfer 231 at one end near the pressure cap 3, so that the pressure cap 3 can be fitted onto the tip 2.

[0024] Furthermore, such as Figures 6-7 As shown in Figure 11, in this embodiment, the front end of the pressure cap 3 is provided with a third chamfer 32, and the nozzle body 1 is provided with a fourth annular limiting step 14. The pressure cap 3 and the fourth annular limiting step 14 are threadedly connected. The front end of the fourth annular limiting step 14 is provided with a fourth chamfer 141 that cooperates with the third chamfer 32. The third chamfer 32 and the fourth chamfer 141 facilitate the pressure cap 3 to enter the fourth annular limiting step 14.

[0025] Furthermore, such as Figure 7 , 9 As shown, in this embodiment, the pressure cap 3 is provided with a fifth annular limiting step 33, which is interference-fitted with the nozzle body 1 to further prevent glue leakage. The nozzle body 1 is provided with a fifth chamfer 15 at the front end, which facilitates the entry of the fifth annular limiting step 33 into the nozzle body 1.

[0026] Assembly principle: Insert the nozzle tip 2 into the spray chamber 11 from the front end of the nozzle body 1, and insert the pressure cap 3 into the spray chamber 11 so that the external thread of the pressure cap 3 is threadedly connected to the internal thread of the nozzle body 1. As the pressure cap 3 goes deeper into the spray chamber 11, the pressure cap 3 drives the nozzle tip 2 to approach and press against the first annular limiting step 13. The pressure cap 3 is gradually fitted onto the third annular limiting step 23 of the nozzle tip 2 until the front end of the pressure cap 3 is pressed against the second annular limiting step 22. During this process, the fifth annular step gradually completes the interference fit with the nozzle body 1.

[0027] During injection molding, the molten material enters the injection chamber 11 from the rear end of the nozzle body 1 and flows along the injection chamber 11 to the molten material channel of the nozzle tip 2. By controlling the valve needle 4 to move axially backward, the molten material channel is opened, and the molten material is injected from the front end of the nozzle tip 2 into the mold cavity. After injection molding is completed, the valve needle 4 moves forward to block the molten material channel and stop injection. Throughout the process, the annular sealing structure prevents molten material leakage, and multiple limiting and interference fits ensure no displacement of the part, guaranteeing injection molding stability.

[0028] Above, refer to Figures 1-11 The hot runner nozzle according to an embodiment of the present invention is described, which greatly improves the sealing performance of the nozzle, prevents the nozzle tip from loosening, reduces the maintenance frequency of the nozzle, and greatly saves production costs.

[0029] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0030] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A hot runner nozzle, characterized in that, Include: The nozzle body has a spray chamber inside it; The nozzle tip is disposed within the injection chamber and located at the front end of the nozzle body; A pressure cap, which is threadedly connected to the nozzle body, is used to fix the tip of the nozzle into the nozzle body; A valve needle, wherein the valve needle is disposed within the tip of the nozzle; The nozzle body has an annular sealing part at the front end and an annular limiting part at the rear end of the pressure cap. A gap is left between the front end of the sealing part and the limiting part of the pressure cap. The nozzle body is provided with a first annular limiting step, which is in close contact with the rear end face of the nozzle tip. A second annular limiting step is provided in the middle of the tip of the mouth, and the second annular limiting step is in close contact with the front end of the pressure cap; The tip of the mouth is also provided with a third annular limiting step, and the pressure cap is fitted on the third annular limiting step and is interference-fitted with the third annular limiting step.

2. The hot runner nozzle as described in claim 1, characterized in that, The tip of the mouth has a first chamfer at its rear end.

3. The hot runner nozzle as described in claim 1, characterized in that, The third annular limiting step has a second chamfer at one end near the pressure cap.

4. The hot runner nozzle as described in claim 1, characterized in that, The pressure cap has a third chamfer at its front end, and the nozzle body has a fourth annular limiting step. The pressure cap and the fourth annular limiting step are threaded together, and the front end of the fourth annular limiting step has a fourth chamfer that matches the third chamfer.

5. The hot runner nozzle as described in claim 1, characterized in that, The pressure cap is provided with a fifth annular limiting step, which is interference-fitted with the nozzle body. The front end of the nozzle body is provided with a fifth chamfer, which facilitates the entry of the fifth annular limiting step into the nozzle body.

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