Hot nozzle and injection mold

Abstract

The hot nozzle comprises a connecting sleeve, a hot runner pipe, a heating piece and a hot nozzle main body, one end of the connecting sleeve is connected with the hot nozzle body, the other end of the connecting sleeve is used for being connected with the splitter plate, and a mounting cavity penetrating through the two ends of the connecting sleeve is formed in the connecting sleeve; the hot nozzle main body is provided with a runner inlet, the hot runner pipe is arranged in the mounting cavity, the hot runner pipe and the inner side wall of the connecting sleeve are arranged at an interval, one end of the hot runner pipe is in sealed connection with the runner inlet, and the other end of the hot runner pipe is used for being in sealed connection with a runner outlet of a splitter plate; and the heating piece is arranged on the outer side wall of the hot runner pipe. The utility model further provides an injection mold using the hot nozzle. Compared with the prior art, the hot nozzle provided by the utility model has the advantage that the use energy consumption and the influence caused by thermal expansion are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of hot nozzle technology, specifically relating to a hot nozzle and an injection mold using the hot nozzle. Background Technology

[0002] In injection molds, hot runners are used to connect the hot runner to the mold cavity. Existing hot runners generally consist of a hot runner body, a heating element, and a sleeve. The top of the hot runner body is connected to the manifold. The heating element is located on the outer wall of the hot runner body and is used to heat the entire hot runner body, keeping the melt inside in a molten state and improving injection molding quality. The sleeve is located outside the hot runner body to enclose the heating element. Existing hot runners have a large body volume, and the heating element needs to heat the entire hot runner body, resulting in high energy consumption. During injection molding, the hot runner undergoes thermal expansion under high temperatures. This axial thermal expansion can cause tensile damage to the connecting parts between the hot runner and the manifold, such as bolts, and may even lead to breakage. It can also easily cause the seals at the contact interface to fail, resulting in plastic leakage. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hot nozzle.

[0004] To achieve the above objectives, this utility model discloses a hot nozzle, including a connecting sleeve, a hot runner pipe, a heating element, and a hot nozzle body;

[0005] One end of the connecting sleeve is connected to the hot nozzle body, and the other end of the connecting sleeve is used to connect to the flow divider. The connecting sleeve has an installation cavity through which both ends pass.

[0006] The hot nozzle body is provided with a flow channel inlet, the hot flow channel tube is provided in the mounting cavity and is spaced apart from the inner side wall of the connecting sleeve, one end of the hot flow channel tube is sealed to the flow channel inlet, and the other end of the hot flow channel tube is used to seal to the flow channel outlet of the flow divider plate.

[0007] The heating element is located on the outer wall of the hot runner pipe.

[0008] In one embodiment, the outlet of the flow channel is recessed to form a first groove, and the end of the hot flow channel tube is sealed and inserted into the first groove.

[0009] In another embodiment, the bottom surface of the first groove is spaced apart from the end face of the hot runner pipe, and during injection molding, the end face of the hot runner pipe presses against the bottom surface of the first groove.

[0010] In another embodiment, the end of the hot runner pipe away from the hot nozzle body extends out of the connecting sleeve.

[0011] In another embodiment, the connecting sleeve is detachably connected to the hot nozzle body.

[0012] In another embodiment, the end of the hot runner tube away from the hot nozzle body extends radially outward to form a connecting lug, and the hot nozzle also includes a bolt that passes through the connecting lug and connects to the manifold.

[0013] In another embodiment, the length of the heating element is less than the length of the mounting cavity.

[0014] This invention also provides an injection mold using the aforementioned hot nozzle.

[0015] An injection mold includes a manifold and a plurality of hot nozzles disposed at the bottom of the manifold, wherein the hot nozzles are any of the hot nozzles described above.

[0016] In one embodiment, the manifold is provided with a flow channel outlet, the flow channel outlet is recessed to form a second groove, the end of the hot runner pipe away from the hot nozzle body is sealed and connected in the second groove and its end face is spaced apart from the bottom surface of the second groove, and the two end faces are pressed together during injection molding.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The connecting sleeve is attached to the hot nozzle body to connect the hot nozzle to the manifold. At the same time, as the main structure to ensure the structural strength of the hot nozzle, the hot runner tube is only used to connect the manifold and the hot nozzle body. Its volume is smaller than that of the traditional hot nozzle body, which reduces the energy consumption of injection molding.

[0019] The hot runner is located inside the mounting cavity and spaced apart from the inner wall of the connecting sleeve. In other words, the mounting cavity of the connecting sleeve is larger than the hot runner. This facilitates the installation of the hot runner and avoids difficulties in installation due to insufficient space in the mounting cavity, or even damage to the heating element installed on the hot runner. At the same time, the gap between the connecting sleeve and the hot runner can be used as an insulation layer to insulate the hot runner, reduce heat loss, improve the heating effect of the hot runner, and further reduce energy consumption.

[0020] The melt within the heating element and hot runner only acts on the hot runner. The connecting sleeve is spaced apart from the hot runner, and the heating element does not directly heat the connecting sleeve. Therefore, during injection molding, the connecting sleeve experiences minimal thermal expansion, and its connection reliability with the manifold and hot nozzle body is essentially unaffected. The hot runner occupies a small overall volume, and its axial expansion after heating has minimal impact on the hot nozzle body and manifold. The gap between the hot runner and the connecting sleeve also provides buffer space for the radial expansion of the hot runner. Therefore, the hot runner also has minimal impact on its connection reliability with the manifold and hot nozzle body. Attached Figure Description

[0021] Figure 1A cross-sectional view of the hot nozzle in the embodiment;

[0022] Connecting sleeve 100; mounting cavity 110; connecting lug 120;

[0023] Hot runner pipe 200;

[0024] Heating element 300;

[0025] Hot nozzle body 400; flow channel inlet 410; first groove 411;

[0026] Bolt 500;

[0027] 600; flow channel outlet 610; second groove 611. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] A type of hot nozzle, see Figure 1 The system includes a connecting sleeve 100, a hot runner pipe 200, a heating element 300, and a hot nozzle body 400. The connecting sleeve 100 is the upper main structure, with one end connected to the hot nozzle body and the other end connected to a manifold 600. The connecting sleeve 100 has a mounting cavity 110 extending through both ends. The hot nozzle body 400 adopts a conventional hot nozzle structure, with a flow inlet 410. The hot runner pipe 200 is located within the mounting cavity 110 and spaced apart from the inner wall of the connecting sleeve 100. One end of the hot runner pipe 200 is sealed to the flow inlet 410, and the other end is sealed to the flow outlet 610 of the manifold 600. The heating element 300 is located on the outer wall of the hot runner pipe 200.

[0031] The hot nozzle described in this embodiment has the following technical advantages:

[0032] (1) The connecting sleeve 100 is connected to the hot nozzle body 400 to connect the hot nozzle to the manifold 600. At the same time, in order to ensure the structural strength of the hot nozzle, the hot runner pipe 200 is only used to connect the manifold 600 and the hot nozzle body 400. Its volume is smaller than that of the traditional hot nozzle body, which reduces the energy consumption of injection molding.

[0033] (2) The hot runner tube 200 is located in the mounting cavity 110 and is spaced apart from the inner side wall of the connecting sleeve 100. In other words, the mounting cavity 110 of the connecting sleeve 100 is larger than the hot runner tube 200. This facilitates the installation of the hot runner tube 200 and avoids difficulties in installing the hot runner tube 200 due to insufficient space in the mounting cavity 110, or even damage to the heating element 300 installed on the hot runner tube 200. At the same time, the gap between the connecting sleeve 100 and the hot runner tube 200 can be used as an insulation layer to insulate the hot runner tube 200, reduce heat loss, improve the heating effect of the hot runner tube 200, and further reduce energy consumption.

[0034] (3) The melt in the heating element 300 and the hot runner 200 only acts on the hot runner 200. The connecting sleeve 100 is spaced apart from the hot runner 200, and the heating element 300 does not directly heat the connecting sleeve 100. Therefore, during the injection molding process, the connecting sleeve 100 will not undergo thermal expansion, and the connecting sleeve 100 will not significantly affect the reliability of its connection with the manifold 600 and the hot nozzle body 400. The hot runner 200 occupies a small overall volume, and its axial expansion after heating has little impact on the hot nozzle body 400 and the manifold 600. The gap between the hot runner 200 and the connecting sleeve 100 also provides buffer space for the radial expansion of the hot runner 200. Therefore, the hot runner 200 will also not significantly affect the reliability of its connection with the manifold 600 and the hot nozzle body 400.

[0035] In this embodiment, the flow channel outlet 610 is recessed to form a first groove 411. The end of the hot runner pipe 200 is sealed and inserted into the first groove 411, and the other end can be inserted into the flow channel outlet 610 of the diverter plate 600. This ensures the sealing effect between the hot runner pipe 200 and the hot nozzle body 400 and the diverter plate 600.

[0036] Specifically, sealant is provided at both ends of the outer wall of the hot runner pipe 200 to ensure a sealing effect.

[0037] Furthermore, the bottom surface of the first groove 411 is spaced apart from the end face of the hot runner pipe 200, and during injection molding, the end face of the hot runner pipe 200 presses against the bottom surface of the first groove 411. The spaced arrangement of the end face of the hot runner pipe 200 with the bottom face of the first groove 411 has the following effects: First, the hot runner pipe 200 expands axially during injection molding, and the end of the hot runner pipe 200 can expand to press against the bottom face of the first groove 411, which further improves the sealing effect of the hot runner pipe 200; Second, compared with directly inserting the end of the hot runner pipe 200 into the bottom of the first groove 411, the spaced arrangement can avoid a large axial force on the hot nozzle body 400 after thermal expansion, which would affect the reliability of the connection structure between the connecting sleeve 100, the hot nozzle body 400, and the manifold 600; Third, the hot runner pipe 200 does not need to be fully inserted into the bottom of the first groove 411 during installation, making assembly simpler; Fourth, since the hot runner pipe 200 has buffer space in the axial and radial directions, its internal interface area remains basically unchanged after thermal expansion, which improves the stability of the melt flow inside the pipe and improves the injection molding quality.

[0038] In this embodiment, the end of the hot runner pipe 200 away from the hot nozzle body 400 extends out of the connecting sleeve for insertion into the flow channel outlet 610 of the flow divider plate 600.

[0039] In this embodiment, the end of the hot runner 200 away from the hot nozzle body 400 extends radially outward to form a connecting lug 120. The hot nozzle also includes a bolt 500, which passes through the connecting lug 120 and connects to the manifold 600. The connecting sleeve is also bolted to the hot nozzle body 400.

[0040] In this embodiment, the length of the heating element 300 is less than the length of the mounting cavity 110, which can prevent thermal expansion caused by the heating element 300 bracket heating the diversion plate 600 and the hot nozzle body 400.

[0041] Example 2

[0042] An injection mold includes a manifold 600 and a plurality of hot nozzles disposed at the bottom of the manifold 600, wherein the hot nozzles are the hot nozzles of Embodiment 1.

[0043] In this embodiment, the manifold 600 is provided with a flow channel outlet 610, and the flow channel outlet 610 is recessed to form a second groove 611. The end of the hot runner pipe 200 away from the hot nozzle body 400 is sealed and connected in the second groove 611, and its end face is spaced apart from the bottom surface of the second groove 611. During injection molding, the two end faces are pressed together.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A heating nozzle, characterized in that: Includes connecting sleeve, hot runner tube, heating element and hot nozzle body; One end of the connecting sleeve is connected to the hot nozzle body, and the other end of the connecting sleeve is used to connect to the flow divider. The connecting sleeve has an installation cavity through which both ends pass. The hot nozzle body is provided with a flow channel inlet, the hot flow channel tube is provided in the mounting cavity and is spaced apart from the inner side wall of the connecting sleeve, one end of the hot flow channel tube is sealed to the flow channel inlet, and the other end of the hot flow channel tube is used to seal to the flow channel outlet of the flow divider plate. The heating element is located on the outer wall of the hot runner pipe.

2. The heating nozzle according to claim 1, characterized in that: The outlet of the flow channel is recessed to form a first groove, and the end of the hot flow channel tube is sealed and inserted into the first groove.

3. The heating nozzle according to claim 2, characterized in that: The bottom surface of the first groove is spaced apart from the end face of the hot runner pipe. During injection molding, the end face of the hot runner pipe presses against the bottom surface of the first groove.

4. The heating nozzle according to claim 1, characterized in that: The end of the hot runner tube away from the hot nozzle body extends out of the connecting sleeve.

5. The heating nozzle according to claim 1, characterized in that: The connecting sleeve is detachably connected to the hot nozzle body.

6. The hot nozzle according to claim 5, characterized in that: The hot runner extends radially outward from the end of the hot nozzle body to form a connecting lug. The hot nozzle also includes a bolt that passes through the connecting lug and connects to the manifold.

7. The heating nozzle according to claim 1, characterized in that: The length of the heating element is less than the length of the mounting cavity.

8. An injection mold, comprising a manifold and a plurality of hot nozzles disposed at the bottom of the manifold, characterized in that: The heating nozzle is the heating nozzle according to any one of claims 1-7.

9. The injection mold according to claim 8, characterized in that: The manifold is provided with a flow channel outlet, and the flow channel outlet is recessed to form a second groove. The end of the hot runner pipe away from the hot nozzle body is sealed and connected in the second groove, and its end face is spaced apart from the bottom surface of the second groove. During injection molding, the two end faces are pressed together.

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