A needle valve type hot runner structure with an embedded heating wire

Abstract

This utility model relates to a needle valve type hot runner structure with an externally embedded heating wire, including an injection component and a support component. The injection component passes through the support component from top to bottom. The upper end of the injection component has a raised edge, and the lower end of the injection component is fixedly installed with a dispensing nozzle. A heating wire is embedded below the raised edge and on the outer periphery of the injection component. The structure also includes an annular heat insulation component, which is fixedly connected to the lower end of the raised edge and blocks the outside of the heating wire. The heat insulation component and the support component are in vertical contact. The heat insulation component and the support component of this utility model form a heat-sealing structure, which can effectively prevent the heat from the heating wire from dissipating outwards. Therefore, the heating wire does not need to be embedded inside the injection component, ensuring the ease of installation.

Description

Technical Field

[0001] This utility model relates to the field of hot runner technology for injection molds. Background Technology

[0002] The working principle of a hot runner system in injection molds is as follows: molten plastic is first heated to an appropriate temperature by the heating elements of the hot runner system, and then injected into the mold cavity through hot nozzles to achieve product injection molding. Among these, the needle valve hot runner is a common type of hot runner system. Its characteristic is the presence of a needle valve at the injection port. Precise control of the molten plastic is achieved by controlling the opening and closing of the needle valve. The needle valve hot runner system can precisely control the amount of molten plastic injected by controlling the opening degree of the needle valve, thus achieving precise filling of each mold cavity. Because the needle valve can be completely closed, it effectively prevents molten plastic from flowing back into the hot runner system and also reduces flash on the product. The needle valve hot runner system allows for rapid opening and closing of the needle valve, enabling the molten plastic to quickly fill the mold cavity, shortening the molding cycle and improving production efficiency. By precisely controlling the injection volume and temperature, the quality of the product can be improved, such as reducing shrinkage and surface defects.

[0003] Currently, some molten plastics need to be kept at a high temperature during the injection process, which requires the hot runner to have a heating function. For example, a common method is to set a heating wire on the hot nozzle. In the past, the heating wire was often placed on the outside of the hot nozzle because it was easier to manufacture. However, this method also makes it easier for the heat of the heating wire to be lost outward, which is not conducive to the injection of some molten plastics with high temperature requirements. Therefore, some technologies embed the heating wire inside the hot nozzle to reduce the heat loss of the heating wire. However, this makes the installation and fixing of the heating wire more complicated and difficult to manufacture. Utility Model Content

[0004] To address the aforementioned problems, this invention proposes a more optimized needle valve-type hot runner structure with an externally embedded heating wire.

[0005] This utility model is achieved using the following technical solution: This utility model proposes a needle valve type hot runner structure with an externally embedded heating wire, including an injection component and a support component. The injection component passes through the support component from top to bottom. The upper end of the injection component is provided with a raised edge. The lower end of the injection component is fixedly installed with a dispensing nozzle. A heating wire is embedded below the raised edge and on the outer periphery of the injection component. The system also includes an annular heat insulation component, which is fixedly connected to the lower end of the raised edge. The heat insulation component blocks the outside of the heating wire, and the heat insulation component and the support component are in vertical contact.

[0006] Preferably, the support member includes a through hole for the injection molding component to pass through, the upper end of the through hole is provided with an annular first step, and the lower end of the heat insulation component is provided with an annular second step, the first step and the second step abutting each other in both the vertical and radial directions.

[0007] Preferably, the heat insulation component and the eaves are fixed by threaded connection.

[0008] Preferably, the heat insulation component is made of heat insulation material.

[0009] Preferably, the lower end of the dispensing component is provided with a sleeve, the dispensing nozzle includes an outer edge portion with a cut-edge circular shape, the sleeve portion is provided with a cut-edge circular hole, and the outer edge portion is inserted into the cut-edge circular hole with a clearance fit.

[0010] Preferably, the device further includes a fixing member, which is fixedly connected to the sleeve opening and abuts upward against the dispensing nozzle.

[0011] The present invention has the following advantages: the heat insulation component and the support component of the present invention form a heat-sealing structure, which can effectively prevent the heat of the heating wire from being lost to the outside. Therefore, the heating wire does not need to be embedded in the inside of the injection component, which ensures the ease of installation of the heating wire. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the needle valve-type hot runner structure with an externally embedded heating wire in the embodiment; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a cross-sectional view of the glue-dispensing component in the embodiment; Figure 4 This is a schematic diagram of the dispensing nozzle in the embodiment. Detailed Implementation

[0013] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0014] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0015] See Figure 1-4As shown in the preferred embodiment of this utility model, a needle valve-type hot runner structure with an embedded heating wire is provided, including an injection component 1 and a support component 2. The support component 2 can be a template of a mold, and the injection component 1 can also be called a hot nozzle. The injection component 1 passes through the support component 2 from top to bottom, and a dispensing nozzle 3 is fixedly installed at the lower end of the injection component 1. Both the injection component 1 and the dispensing nozzle 3 are provided with injection channels, such as the injection channel 11 of the injection component 1. A valve needle 4 is inserted in the injection channels of the injection component 1 and the dispensing nozzle 3, and the sliding of the valve needle 4 controls the opening and closing of the dispensing nozzle 3.

[0016] A raised bezel 12 is provided at the upper end of the injection part 1. A heating wire 5 is embedded below the raised bezel 12 and on the outer periphery of the injection part 1. In this embodiment, the heating wire 5 is spirally arranged and embedded into the injection part 1 by rolling. Correspondingly, the outer periphery of the injection part 1 may have a spiral groove for embedding the heating wire 5. A ring-shaped heat insulation member 6 is fixedly connected to the lower end of the raised bezel 12. The heat insulation member 6 blocks the outside of the heating wire 5, and the heat insulation member 6 and the support member 2 abut against each other in the vertical direction to form a heat-sealed structure. In this embodiment, even though the heating wire 5 is embedded on the outer periphery of the injection part 1, the heat insulation member 6 and the support member 2 form a heat-sealed structure, which can effectively prevent the heat of the heating wire 5 from dissipating outward. Therefore, in this embodiment, the heating wire 5 does not need to be embedded inside the injection part 1, ensuring the ease of installation of the heating wire 5.

[0017] In this embodiment, the support member 2 includes a through hole 21 through which the injection part 1 passes. The upper end of the through hole 21 is provided with an annular first step 22, and the lower end of the heat insulation member 6 is provided with an annular second step 61. The first step 22 and the second step 61 are in contact with each other in both the vertical and radial directions, thereby providing a better heat sealing effect.

[0018] In this embodiment, the heat insulation component 6 and the eaves 12 are fixed by a threaded connection. In other embodiments, other fixing methods may be used, but a threaded connection is more convenient for replacing the heat insulation component 6. The heat insulation component 6 is preferably made of heat insulation material.

[0019] In this embodiment, a sleeve 13 is provided at the lower end of the dispensing component 1. The dispensing nozzle 3 includes a rounded outer edge 31, and the sleeve 13 has a rounded hole 131. The outer edge 31 is inserted into the rounded hole 131 with a clearance fit. Since the outer edge 31 and the rounded hole 131 are in a clearance fit, the dispensing nozzle 3 can be prevented from jamming after thermal expansion. At the same time, the fit between the outer edge 31 and the rounded hole 131 can also prevent the dispensing nozzle 3 from rotating. A fixing member 7 is fixedly connected to the sleeve 13, and the fixing member 7 abuts upward against the dispensing nozzle 3 to support the dispensing nozzle 3.

[0020] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that any changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. An outer-embedded heater wire needle valve hot runner structure comprising a nozzle and a support, the nozzle being vertically arranged through the support, characterized in that: The upper end of the glue-injecting component is provided with a raised edge, and the lower end of the glue-injecting component is fixedly installed with a glue nozzle. A heating wire is embedded in the outer periphery of the glue-injecting component below the raised edge, and an annular heat insulation component is also included. The heat insulation component is fixedly connected to the lower end of the raised edge, and the heat insulation component blocks the outside of the heating wire. The heat insulation component and the support component are in vertical contact.

2. The pin-valve hot runner structure with externally cased heating wire of claim 1, wherein: The support includes a perforation through which the injection molding component passes. The upper end of the perforation is provided with an annular first step, and the lower end of the heat insulation component is provided with an annular second step. The first step and the second step are in contact with each other in both the vertical and radial directions.

3. The pin-valve hot runner structure of claim 1, wherein: The heat insulation component and the eaves are fixed by threaded connection.

4. The pin-valve hot-runner structure of claim 1, wherein: The heat insulation component is made of heat insulation material.

5. The pin-valve hot-runner structure of claim 1, wherein: The lower end of the dispensing component is provided with a sleeve, and the dispensing nozzle includes an outer edge portion with a cut-edge circular shape. The sleeve is provided with a cut-edge circular hole, and the outer edge portion is inserted into the cut-edge circular hole with a clearance fit.

6. The pin-valve hot-runner structure of claim 5, wherein: It also includes a fixing member, which is fixedly connected to the sleeve opening and abuts upward against the dispensing nozzle.

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