Heat insulation structure between mold and hot runner hot nozzle

Abstract

The utility model relates to the technical field of injection molds, and provides a heat insulation structure between a mold and a hot nozzle of a hot runner, which comprises a hot nozzle and a mold, a material flow channel is arranged in the hot nozzle, and the heat insulation structure is characterized in that a front mold core is arranged at the end part, combined with the hot nozzle, of the mold, a heat insulation groove is arranged in the front mold core and is of an annular structure, and the heat insulation groove is communicated with the material flow channel. The end part of the hot nozzle is in contact with a plastic product; according to the heat insulation structure between the mold and the hot runner hot nozzle, the annular heat insulation groove is additionally formed in the sealed outer side of the hot nozzle and the mold, the heat insulation groove is used as air of a poor conductor, heat exchange inside and outside the heat insulation groove can be prevented, and the heat insulation effect of the hot nozzle structure is achieved; the phenomena of cold material, material flower, unstable size, glue inlet blockage and the like of a product caused by heat loss of the hot nozzle are effectively avoided, the structure is novel, the processing is simple and feasible, the injection molding process is stable, and the qualified rate of finished product quality is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a heat insulation structure between a mold and a hot runner nozzle. Background Art

[0002] Injection molds are tools used to produce plastic products by injection molding. They are usually used to mass produce certain parts with complex shapes, and they play a role in giving plastic products a complete structure and precise dimensions. In the actual production process, the heated and melted plastic is usually injected into the mold cavity of the injection mold by the injection molding machine under high pressure. After cooling and solidification, the molded product is ejected. During the injection molding process, if the temperature at the hot nozzle of the hot runner of the injection mold is too low, the plastic at the hot nozzle will not reach the optimal melting state and the fluidity will deteriorate, which will lead to unstable injection of molten plastic material, cold material, and unbalanced multi-cavity discharging. Therefore, the temperature of the hot nozzle needs to be controlled.

[0003] The existing insulation method is mainly to heat through a heating wire wrapped around the hot runner flow channel, but the heating wire cannot directly act on the hot nozzle, which causes the temperature of the hot runner part above the hot nozzle to be relatively high. The hot nozzle itself has insufficient temperature due to heat loss caused by contact with the mold, affecting the stability of production and the performance of the finished product. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a heat insulation structure between a mold and a hot runner nozzle in view of the deficiencies in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A heat insulation structure between a mold and a hot runner nozzle, comprising a nozzle and a mold, wherein a material flow channel is arranged inside the nozzle, and wherein the mold is provided with a front mold core at the end portion combined with the nozzle, wherein a heat insulation groove is arranged inside the front mold core, wherein the heat insulation groove is an annular structure, and the end portion of the nozzle is in contact with a plastic product.

[0007] As a further improvement of the utility model, the heat-insulating groove includes a heat-insulating inner groove and a heat-insulating wall.

[0008] As a further improvement of the utility model, an R angle is provided at the bottom of the heat-insulating inner groove.

[0009] As a further improvement of the present invention, the width of the heat-insulating inner groove is 1.5-2.5 mm.

[0010] As a further improvement of the present invention, the depth of the heat-insulating inner groove is greater than or equal to 2 mm.

[0011] As a further improvement of the utility model, the bottom surface of the heat-insulating inner groove is 0.2-1 mm deeper than the effective contact surface between the hot nozzle and the front mold core.

[0012] As a further improvement of the present invention, the thickness of the heat insulation wall is set to 2-3 mm.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model provides a heat insulation structure between a mold and a hot runner hot nozzle. By adding an annular heat insulation groove on the outer side of the hot nozzle and the mold seal, the heat insulation groove is used as the air of the poor conductor to prevent the heat exchange inside and outside the heat insulation groove, thereby achieving the effect of heat insulation and heat preservation of the hot nozzle structure, and effectively avoiding the phenomenon of cold material, material flower, unstable size, and glue inlet blockage caused by heat loss of the hot nozzle. The utility model has a novel structure, simple and feasible processing, stable injection molding process, and ensures the qualified rate of finished product quality.

[0015] 2. The heat insulation groove structure of the utility model is arranged on the front mold core. Compared with the previous heat insulation structure, the structure is simpler, more effective and easier to process, and can be used in the positions where the structures such as cooling water jacket and heat insulation water jacket are difficult to place.

[0016] 3. The heat-insulating groove structure of the utility model includes a heat-insulating inner groove and a heat-insulating wall. The bottom of the heat-insulating inner groove is provided with an R angle, which can eliminate sharp corners, avoid stress concentration, and increase mold strength.

[0017] 4. The depth of the heat insulation groove in the utility model is greater than or equal to 2 mm, and the heat insulation bottom surface is 0.2-1 mm deeper than the effective contact surface between the hot nozzle and the front mold core, ensuring the heat insulation effect of the hot nozzle.

[0018] 5. The width of the heat insulation groove in the utility model is 1.5-2.5mm, and the depth of the heat insulation wall is 2-3mm, which ensures the sealing between the mold and the hot nozzle and the heat insulation effect on the hot nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Attached Figure 1 This is a schematic diagram of the overall structure of the utility model

[0021] Attached Figure 2 It is a cross-sectional view of the local structure of the heat insulation tank of the utility model.

[0022] In the figure: 1 is a hot nozzle, 2 is a mold, 3 is a material flow channel, 4 is a front mold core, 5 is a heat insulation groove, 501 is a heat insulation inner groove, 502 is a heat insulation wall, 503 is an R corner, and 6 is a plastic product. Implementation

[0023] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 As shown, a heat insulation structure between a mold and a hot runner nozzle comprises a nozzle 1 and a mold 2, wherein the nozzle 1 is provided with a material flow channel 3, and is characterized in that the mold 2 is provided with a front mold core 4 at the end combined with the nozzle 1, and the front mold core 4 is provided with a heat insulation groove 5 inside, and the heat insulation groove is an annular structure, so as to facilitate all-round heat insulation of the nozzle 1 and improve the thermal insulation effect, and the end of the nozzle 1 is in contact with the plastic product 6.

[0025] In a specific embodiment, further, the heat-insulating groove 5 includes a heat-insulating inner groove 501 and a heat-insulating wall 502 .

[0026] In a specific embodiment, further, an R-angle 503 is provided at the bottom of the heat-insulating inner groove 501, and the R-angle can eliminate sharp corners and avoid stress concentration.

[0027] In a specific embodiment, further, the width of the heat-insulating inner groove 501 is 1.5-2.5 mm.

[0028] In a specific embodiment, further, the depth of the heat-insulating inner groove 501 is greater than or equal to 2 mm.

[0029] In a specific embodiment, further, the bottom surface of the heat-insulating inner groove 501 is 0.2-1 mm deeper than the effective contact surface between the hot nozzle 1 and the front mold core 4 to ensure the heat-insulating effect on the hot nozzle 1.

[0030] In a specific embodiment, further, the thickness of the heat insulation wall 502 is set to 2-3 mm to ensure the sealing between the mold 2 and the hot nozzle 1.

[0031] The specific working process is as follows: when the injection molding operation is performed, the hot nozzle 1 contacts the plastic product 6, and the heated and melted plastic flows to the end of the hot nozzle 1 through the material flow channel 3. Since there is air as a poor conductor in the insulation groove 5, the heat exchange inside and outside the insulation groove 5 can be prevented, thereby achieving the effect of heat insulation and heat preservation of the hot nozzle 1 structure. The temperature of the hot nozzle 1 is controlled, and the injection molding operation can be carried out smoothly.

[0032] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.

[0033] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A heat insulation structure between a mold and a hot runner nozzle, comprising a nozzle (1) and a mold (2), wherein a material flow channel (3) is provided in the nozzle (1), characterized in that: The mold (2) is provided with a front mold core (4) at the end portion connected to the hot nozzle (1), a heat insulation groove (5) is provided inside the front mold core (4), and the heat insulation groove (5) is an annular structure. The end portion of the hot nozzle (1) is in contact with the plastic product (6).

2. The heat insulation structure between the mold and the hot runner nozzle according to claim 1, characterized in that: The heat-insulating groove (5) comprises a heat-insulating inner groove (501) and a heat-insulating wall (502).

3. The heat insulation structure between the mold and the hot runner nozzle according to claim 2, characterized in that: The bottom of the heat-insulating inner groove (501) is provided with an R corner (503).

4. The heat insulation structure between the mold and the hot runner nozzle according to claim 2, characterized in that: The width of the heat-insulating inner groove (501) is 1.5-2.5 mm.

5. The heat insulation structure between the mold and the hot runner nozzle according to claim 2, characterized in that: The heat-insulating inner groove (501) has a groove depth greater than or equal to 2 mm.

6. The heat insulation structure between the mold and the hot runner nozzle according to claim 2, characterized in that: The bottom surface of the heat-insulating inner groove (501) is 0.2-1 mm deeper than the effective contact surface between the hot nozzle (1) and the front mold core (4).

7. The heat insulation structure between the mold and the hot runner nozzle according to claim 2, characterized in that: The thickness of the heat insulation wall (502) is set to 2-3 mm.

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