A hot runner structure with anti-loosening structure

Abstract

The utility model discloses a hot runner structure with an anti-loosening structure, including an inner core and a nozzle core, wherein the inner core is a tube body with a fluid channel in the middle, the inner core is made of a first metal material, the nozzle core is a tube body with a positioning cavity in the middle, the inner core is arranged in the positioning cavity and fits with the inner wall of the nozzle core, and covers the inner core away from the lower part, and the nozzle core is made of a second metal material; the hardness of the second metal material is less than the hardness of the first metal material. When an external heating device heats the inner core and the nozzle core, the temperature of the nozzle core is quickly transferred to the inner core through the heat conductivity difference of the metal material, thereby increasing the temperature of the plastic fluid and avoiding the problem of temperature imbalance. At the same time, the hardness of the inner core is greater than the hardness of the nozzle core, and even if the temperature of the inner core is greater than that of the nozzle core, it will not cause a large gap between the inner core and the nozzle core, thereby causing the problem of loosening during processing.

Description

Technical Field

[0001] The utility model relates to the field of hot runners, in particular to a hot runner structure with an anti-loosening structure. Background Art

[0002] Hot runner is a heating component system used in injection molds to inject molten plastic particles into the mold cavity. Hot runner molds are a new structure that heats the runners and channels of traditional molds or three-plate molds, so that the runners and channels do not need to be removed during each molding. Needle valve hot runners need to control the nozzle to open and close the hot runner, and the opening and closing degree of the nozzle is the key to accurately control the stable flow of plastic fluid.

[0003] The nozzle structure is generally formed by CNC integrated processing, but this structure has high processing costs and some processing details have defects or rough surface problems, which in turn affects the smoothness of the plastic flow channel.

[0004] Of course, there are also structures in which the nozzle body and the nozzle tip are processed separately and then assembled, such as Chinese patent CN202321923563.9. However, for some processing requirements, such as products with high valve needle operating frequency or large temperature difference, this structure may cause the nozzle tip and the nozzle body to become loose after a period of use, thereby affecting the processing efficiency and processing stability. Utility Model Content

[0005] The main purpose of the utility model is to propose a hot runner structure with an anti-loosening structure, aiming to improve the structure of the nozzle, thereby ensuring its stable combination, and having a low processing cost, effectively ensuring production stability.

[0006] To achieve the above-mentioned purpose, the utility model proposes a hot runner structure with an anti-loosening structure, comprising:

[0007] An inner core, the inner core is a tube body with a fluid channel in the middle, and the inner core is made of a first metal material;

[0008] The nozzle core is a tube body with a positioning cavity in the middle, the inner core is arranged in the positioning cavity and fits with the inner wall of the nozzle core, and covers the inner core away from the lower part, and the nozzle core is made of a second metal material;

[0009] The hardness of the second metal material is less than the hardness of the first metal material.

[0010] The inner core and the nozzle are made of two metal materials. When the inner core and the nozzle are heated by an external heating device, the temperature of the nozzle is quickly transferred to the inner core through the difference in thermal conductivity of the metal materials, thereby increasing the temperature of the plastic fluid and avoiding the problem of temperature imbalance. At the same time, the hardness of the inner core is greater than that of the nozzle. Even if the temperature of the inner core is higher than that of the nozzle, a large gap will not be formed between the inner core and the nozzle, thereby causing the problem of looseness during processing. At the same time, the fluid channel of the inner core has the plastic fluid absorbing its temperature, which can also effectively reduce its deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the hot runner structure;

[0012] Figure 2 It is a schematic diagram of the cooperation between the inner core and the nozzle core;

[0013] Figure 3 Schematic diagram of the inner core;

[0014] Figure 4 It is a schematic diagram of the inner core and the nozzle core matching the outside.

[0015] In the figure, 1 is an inner core, 11 is a fluid channel, 101 is a first vertical portion, 102 is a first diameter-enlarged portion, 103 is a second diameter-enlarged portion, 104 is a second vertical portion, 105 is a third diameter-enlarged portion, 106 is a third vertical portion, 107 is a transition section,

[0016] 2 is the nozzle core, 21 is the positioning cavity, 3 is the valve core, 31 is the sealing section, 32 is the limiting section, 33 is the connecting section,

[0017] 4 is the tip of the nozzle, 41 is the first limiting portion, 42 is the second limiting portion, 51 is the first column, 52 is the second column,

[0018] 6 is a side wing, 7 is a heat-conducting sleeve, and 8 is a main pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. 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.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0022] like Figures 1 to 4 As shown, a hot runner structure with an anti-loosening structure comprises:

[0023] An inner core 1, wherein the inner core 1 is a tube body with a fluid channel 11 in the middle, and the inner core 1 is made of a first metal material;

[0024] The core 2 is a tube with a positioning cavity 21 in the middle. The inner core 1 is arranged in the positioning cavity 21 and fits with the inner wall of the core 2, and covers the inner core 1 away from the lower part. The core 2 is made of a second metal material;

[0025] The hardness of the second metal material is less than the hardness of the first metal material.

[0026] The inner core 1 and the nozzle 2 are made of two metal materials. When the inner core 1 and the nozzle 2 are heated by an external heating device, the temperature of the nozzle 2 is quickly transferred to the inner core 1 through the difference in thermal conductivity of the metal materials, thereby increasing the temperature of the plastic fluid and avoiding the problem of temperature imbalance. At the same time, the hardness of the inner core 1 is greater than that of the nozzle 2. Even if the temperature of the inner core 1 is greater than that of the nozzle 2, a large gap will not be formed between the inner core 1 and the nozzle 2, thereby causing the problem of looseness during processing. At the same time, the fluid channel 11 of the inner core 1 has the plastic fluid absorb its temperature, which can also effectively reduce its deformation.

[0027] Specifically, the inner core 1 is made of steel material, and the nozzle core 2 is made of beryllium copper material. Specifically, the steel material is SUS440C or imported S136, and the model of beryllium copper is D12-26; the steel material has good corrosion resistance, high hardness and excellent deformation resistance, and also has very good wear resistance, cutting and hardenability. And its deformation rate is low, which can ensure good surface accuracy;

[0028] The combination of different materials effectively ensures the temperature of the plastic fluid while avoiding the problem of burning glue due to over-high temperature. This changes the situation of unstable bonding and temperature of traditional single materials. At the same time, the hardness difference and temperature difference, that is, the bonding between the two is guaranteed according to the thermal expansion coefficient. The bonding is stable during assembly, such as welding, screw threads and other fixing methods. Therefore, even if there is a large temperature difference during use, the gap between the two caused by a single material can be avoided.

[0029] In the embodiment of the utility model, the fluid channel 11 includes a first vertical portion 101, a first enlarged diameter portion 102, a second enlarged diameter portion 103, a second vertical portion 104, a third enlarged diameter portion 105 and a third vertical portion 106 which are sequentially connected from bottom to top, so that the segmented structure can ensure the stable flow of the plastic fluid, while also ensuring the convenience of processing and avoiding the increase of processing costs due to processing requirements.

[0030] Furthermore, the fluid channel 11 is slidably mounted with a valve core 3, and the valve core 3 is provided with a sealing section 31 matched with the first vertical portion, a limiting section 32 matched with the first expanded diameter portion and the second expanded diameter portion, and a connecting section 33, thereby achieving sliding stability of the valve core 3.

[0031] In the embodiment of the utility model, a transition section 107 with a predetermined chamfer is provided between the third diameter-enlarged portion and the third vertical portion, thereby ensuring the smoothness of the inner wall.

[0032] In the embodiment of the utility model, the outer peripheral wall of the inner core 1 includes a nozzle tip 4, a first limiting portion 41 and a first column 51 distributed from bottom to top, and the nozzle core 2 includes a second limiting portion 42 matched with the first limiting portion 41 and a second column 52 matched with the first column, thereby realizing mutual assembly of the two.

[0033] Specifically, the outer peripheral wall of the nozzle core 2 is provided with a side wing 6 protruding outward, and the side wing is provided with a screw thread, thereby facilitating the mutual fixation between the nozzle core 2 and the heat-conducting sleeve.

[0034] In the embodiment of the utility model, the outer peripheral wall of the nozzle core 2 is provided with a heat-conducting sleeve 7, and the heat-conducting sleeve is provided with a locking position matched with the side wings.

[0035] In the embodiment of the utility model, the heat-conducting sleeve is provided with a main pipe 8, and the inner core 1, the nozzle core 2 and the heat-conducting sleeve are installed therein. The structure of the main pipe is prior art and will not be described in detail here.

[0036] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A hot runner structure with an anti-loosening structure, characterized in that: include: An inner core, the inner core is a tube body with a fluid channel in the middle, and the inner core is made of a first metal material; The nozzle core is a tube body with a positioning cavity in the middle, the inner core is arranged in the positioning cavity and fits with the inner wall of the nozzle core, and covers the inner core away from the lower part, and the nozzle core is made of a second metal material; The hardness of the second metal material is less than the hardness of the first metal material.

2. The hot runner structure with anti-loosening structure according to claim 1, characterized in that: The inner core is made of steel material, and the nozzle core is made of beryllium copper material.

3. The hot runner structure with anti-loosening structure according to claim 1, characterized in that: The fluid channel includes a first vertical portion, a first enlarged diameter portion, a second enlarged diameter portion, a second vertical portion, a third enlarged diameter portion and a third vertical portion which are sequentially connected from bottom to top.

4. The hot runner structure with anti-loosening structure according to claim 3, characterized in that: The fluid channel is slidably mounted with a valve core, and the valve core is provided with a sealing section matched with the first vertical portion, a limiting section matched with the first diameter expansion portion and the second diameter expansion portion, and a connecting section.

5. The hot runner structure with anti-loosening structure according to claim 4, characterized in that: A transition section with a predetermined chamfer is provided between the third enlarged diameter portion and the third vertical portion.

6. The hot runner structure with anti-loosening structure according to claim 1, characterized in that: The outer peripheral wall of the inner core includes a nozzle tip, a first limiting portion and a first column distributed from bottom to top, and the nozzle core includes a second limiting portion matched with the first limiting portion and a second column matched with the first column.

7. The hot runner structure with anti-loosening structure according to claim 1, characterized in that: The outer peripheral wall of the nozzle core is provided with a side wing protruding outwards, and the side wing is provided with a screw thread.

8. The hot runner structure with anti-loosening structure according to claim 1, characterized in that: The outer peripheral wall of the nozzle core is provided with a heat-conducting sleeve, and the heat-conducting sleeve is provided with a clamping position matched with the side wing.

9. The hot runner structure with anti-loosening structure according to claim 8, characterized in that: The heat-conducting sleeve is provided with a main pipe, and the inner core, the nozzle core and the heat-conducting sleeve are installed in the main pipe.

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