A hot runner structure with three-claw positioning

Abstract

The utility model discloses a hot runner structure with three-claw positioning, including an inner core, a nozzle core, a heat-conducting sleeve and a main pipe, wherein the inner core is a pipe body provided with a sliding channel, wherein the sliding channel is provided with a nozzle opening, a slope section and a glue injection section arranged in sequence from bottom to top, wherein the inner peripheral wall of the slope section is provided with three claws spaced along its circumference, wherein the nozzle core is provided with a positioning cavity, wherein the position of the inner core away from the nozzle opening is installed in the positioning cavity and fits with the inner wall of the nozzle core, and the heat-conducting sleeve is installed on the outer peripheral wall of the nozzle core and fits with it. By improving the sliding channel structure of the inner core, the sliding channel structure is made simpler, and at the same time, the setting of the three claws makes the sliding of the valve needle more stable, thereby ensuring the sliding accuracy of the valve needle; at the same time, the inner core, the nozzle core and the heat-conducting sleeve are assembled in the same component through the main pipe, so that it can ensure the predetermined plastic fluid temperature, and at the same time, the structural stability is better.

Description

Technical Field

[0001] The utility model relates to the field of hot runners, in particular to a hot runner structure with three-claw positioning 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. Valve needle 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 three-claw positioning, 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 objectives, the utility model proposes a hot runner structure with three-claw positioning, comprising:

[0007] The inner core is a tube body provided with a sliding channel, and the sliding channel is provided with a vertically arranged nozzle, a slope section and a vertically arranged injection section arranged in sequence from bottom to top, and the inner peripheral wall of the slope section is provided with three claws spaced along the circumference thereof, and the three claws form a limiting channel for the valve needle to slide;

[0008] The nozzle core is provided with a positioning cavity, and the inner core is installed in the positioning cavity at a position away from the nozzle opening and fits with the inner wall of the nozzle core;

[0009] A heat-conducting sleeve, which is mounted on the outer peripheral wall of the nozzle core and fits therewith;

[0010] The main pipe is installed on the outer peripheral wall of the heat-conducting sleeve, and the inner core, the nozzle core and the heat-conducting sleeve are installed therein, and the lower end of the inner core extends out of the lower end position of the main pipe and is limited by the main pipe.

[0011] In the actual design of the technical solution of the utility model, the sliding channel structure of the inner core is improved to make the sliding channel structure simpler. At the same time, the three claws are arranged to make the sliding of the valve needle more stable, thereby ensuring the sliding accuracy of the valve needle. At the same time, the inner core, the nozzle core and the heat-conducting sleeve are assembled in the same component through the main pipe, so that the predetermined plastic fluid temperature can be guaranteed, and the structural stability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 Schematic diagram of the inner core structure;

[0014] Figure 3 It is a schematic diagram of the inner core and nozzle core structure;

[0015] Figure 4 It is a top view of the utility model.

[0016] In the figure, 1 is the inner core, 10 is the sliding channel, 11 is the mouth, 12 is the inclined section, 13 is the injection section, 2 is the claw,

[0017] 3 is the nozzle core, 31 is the limiting channel, 32 is the guide area,

[0018] 4 is a heat-conducting sleeve, 5 is a main pipe, 51 is a hook, 52 is a stopper,

[0019] 61 is the first positioning inclined plane, 611 is the first limiting inclined plane, 612 is the second limiting inclined plane, 62 is the second positioning inclined plane,

[0020] 71 is a first engaging portion, 72 is a second engaging portion, 81 is a screw thread portion, and 82 is a groove. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] like Figures 1 to 4 As shown, a hot runner structure with three-claw positioning includes:

[0025] An inner core 1, the inner core 1 is a tube body provided with a sliding channel 10, the sliding channel 10 is provided with a vertically arranged mouth 11, a slope section 12 and a vertically arranged injection section 13 arranged in sequence from bottom to top, the inner peripheral wall of the slope section 12 is provided with three claws 2 spaced apart along the circumference thereof, and the three claws 2 surround a limiting channel 31 for sliding of the valve needle;

[0026] The nozzle core 3 is provided with a positioning cavity 31, and the inner core 1 is installed in the positioning cavity at a position away from the nozzle opening 11 and fits with the inner wall of the nozzle core 3;

[0027] A heat-conducting sleeve 4, which is mounted on the outer wall of the nozzle core 3 and fits therewith;

[0028] The main pipe 5 is installed on the outer peripheral wall of the heat-conducting sleeve 4, and the inner core 1, the nozzle core and the heat-conducting sleeve 4 are installed therein. The lower end of the inner core 1 extends out of the lower end position of the main pipe 5 and is limited by the main pipe 5.

[0029] In the actual design, the structure of the sliding channel 10 of the inner core 1 is improved to make the structure of the sliding channel 10 simpler. At the same time, the three claws 2 are arranged to make the sliding of the valve needle more stable, thereby ensuring the sliding accuracy of the valve needle. At the same time, the inner core 1, the nozzle core and the heat-conducting sleeve 4 are assembled in the same component through the main pipe 5, so that it can ensure the predetermined plastic fluid temperature and have better structural stability.

[0030] Specifically, a hook portion 51 is provided at the lower end of the main pipe 5, and a stopper 52 is provided at the lower end of the inner core 1 for limiting the lower end of the hook portion 51, thereby further limiting the inner core 1, wherein the stopper can be post-welded and then polished.

[0031] In the embodiment of the utility model, the lower outer wall of the inner core 1 is provided with a first limiting slope 611, the first limiting slope is provided above a first clamping portion 71, the mouth core is provided with a second clamping portion 72 matched with the first clamping portion, and the outer side wall of the mouth core is provided with a second limiting slope 612 matched with the first limiting slope, thereby achieving mutual cooperation between the inner core 1 and the mouth core.

[0032] Furthermore, the first limiting inclined surface and the second limiting inclined surface form a first positioning inclined surface 61, and the main pipe 5 is provided with a second positioning inclined surface 62 matched with the first positioning inclined surface 61, so that the inner core 1 and the nozzle core are fixed simultaneously through the second positioning inclined surface 62 of the main pipe 5.

[0033] In the embodiment of the utility model, the claw portion 2 is inclined downward toward the axis from top to bottom, thereby ensuring the stable flow of the plastic fluid.

[0034] Specifically, the claw portion 2 is arc-shaped toward the axis, and a guide area 32 is formed between the two claw portions 2. The width between the two guide areas 32 is greater than the width of the valve needle, which ensures the sliding stability of the valve needle and the limiting of the valve needle.

[0035] In the embodiment of the utility model, the inner core 1 is made of steel material, and the nozzle core 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 property and hardenability. Moreover, its deformation rate is low, which can ensure good surface accuracy;

[0036] 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.

[0037] In the embodiment of the utility model, the outer peripheral wall of the nozzle core is provided with a screw thread portion 81, thereby achieving mutual fixation between the nozzle core and the heat-conducting sleeve 4.

[0038] Specifically, the outer wall of the heat-conducting sleeve 4 is provided with a groove 82 for installing the heat pipe.

[0039] 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 three-claw positioning, characterized in that: include: The inner core is a tube body provided with a sliding channel, and the sliding channel is provided with a vertically arranged nozzle, a slope section and a vertically arranged injection section arranged in sequence from bottom to top, and the inner peripheral wall of the slope section is provided with three claws spaced along the circumference thereof, and the three claws form a limiting channel for the valve needle to slide; The nozzle core is provided with a positioning cavity, and the inner core is installed in the positioning cavity at a position away from the nozzle opening and fits with the inner wall of the nozzle core; A heat-conducting sleeve, which is mounted on the outer peripheral wall of the nozzle core and fits therewith; The main pipe is installed on the outer peripheral wall of the heat-conducting sleeve, and the inner core, the nozzle core and the heat-conducting sleeve are installed therein, and the lower end of the inner core extends out of the lower end position of the main pipe and is limited by the main pipe.

2. The hot runner structure with three-claw positioning according to claim 1, characterized in that: The lower end of the main pipe is provided with a hook portion, and the lower end of the inner core is provided with a stopper for limiting the lower end of the hook portion.

3. The hot runner structure with three-claw positioning according to claim 1, characterized in that: The lower outer wall of the inner core is provided with a first limiting slope, a first clamping portion is provided above the first limiting slope, the nozzle core is provided with a second clamping portion matched with the first clamping portion, and the outer side wall of the nozzle core is provided with a second limiting slope matched with the first limiting slope.

4. The hot runner structure with three-claw positioning according to claim 3, characterized in that: The first limiting inclined surface and the second limiting inclined surface form a first positioning inclined surface, and the main pipe is provided with a second positioning inclined surface matching the first positioning inclined surface.

5. The hot runner structure with three-claw positioning according to claim 1, characterized in that: The claw portion is inclined downward toward the axis from top to bottom.

6. The hot runner structure with three-claw positioning according to claim 5, characterized in that: The claw portion is in an arc shape toward the axis, and a guide area is formed between the two claw portions. The width between the two guide areas is greater than the width of the valve needle.

7. The hot runner structure with three-claw positioning 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.

8. The hot runner structure with three-claw positioning according to claim 1, characterized in that: The outer peripheral wall of the nozzle core is provided with a screw thread portion.

9. The hot runner structure with three-claw positioning according to claim 1, characterized in that: The outer peripheral wall of the heat-conducting sleeve is provided with a groove for installing the heat pipe.

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