Hot nozzle structure with high injection molding quality

Abstract

The utility model relates to a hot nozzle structure with high injection molding quality, which comprises a hot nozzle body, a feed port and a sprue, the feed port and the sprue are arranged on the hot nozzle body, a runner is arranged in the hot nozzle body, the feed port and the sprue are respectively positioned at two ends of the runner, a nozzle core, a heat insulation sleeve and a sprue bushing are arranged in the runner, and the sprue bushing is arranged in the runner. The heat preservation sleeve is arranged on the outer side of the nozzle core in a sleeving mode, a gap is reserved between the nozzle core and the inner wall of the heat preservation sleeve, a heat preservation cavity is formed, a mounting hole is formed in the sprue, the nozzle core and the heat preservation sleeve are inserted into the mounting hole, a nozzle tip is arranged at one end of the nozzle core, the nozzle tip protrudes out of the sprue to the outer side of the hot nozzle body, and the nozzle core is sleeved with the heat preservation sleeve. The end, protruding out of the mounting hole, of the heat preservation sleeve is sleeved with a heat insulation cap, and the heat insulation cap abuts against the heat preservation sleeve and the inner wall of the hot nozzle body. The surface quality of an injection molding product can be effectively improved, flaws such as bulges and material patterns on the surface of the product are avoided, and the injection molding effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runner injection molding, in particular to a hot nozzle structure with high injection molding quality. Background Art

[0002] Currently, with the precision industry's increasing demand for higher precision and surface quality in injection molded products, the requirements for hot runners in injection molds are also increasing. Some existing hot nozzles feature a nozzle core and a gate assembly. The gate assembly is located outside the nozzle core. The nozzle core is used to insulate the passing raw material and maintain its melting point, while the gate assembly primarily serves as a pressure-bearing device. During the injection molding process, because the gate assembly is primarily made of metal alloy and directly located outside the nozzle core, the raw material may lose some heat due to heat transfer as it passes through. This can result in insufficient temperature when the raw material reaches the gate, making it difficult to dispense the glue. Furthermore, the gate assembly's structure is difficult to adjust, and when installed inside the hot nozzle, it is prone to structural dead spots, where some raw material can easily remain. This can easily lead to color mixing during subsequent injection molding. Furthermore, the nozzle core of existing hot nozzles is located inside the hot nozzle. When injecting high-temperature raw materials, due to slow cooling rates, it is prone to stringing and unclean breakpoints. This can lead to surface defects such as bumps and material splatter on the molded product, seriously affecting product quality. Utility Model Content

[0003] In view of this, an object of the present invention is to provide a hot nozzle structure with high injection molding surface quality and good injection molding effect.

[0004] A hot nozzle structure with high injection molding quality comprises a hot nozzle body, and a feed port and a gate arranged on the hot nozzle body, a runner is provided inside the hot nozzle body, the feed port and the gate are respectively located at the two ends of the runner, a nozzle core, an insulation sleeve and a gate boss are provided in the runner, the insulation sleeve is arranged on the outside of the nozzle core, a gap is left between the nozzle core and the inner wall of the insulation sleeve and an insulation cavity is formed, the gate boss is provided with a mounting hole, the nozzle core and the insulation sleeve are inserted into the mounting hole, a nozzle tip is provided at one end of the nozzle core, the nozzle tip protrudes from the gate to the outside of the hot nozzle body, and an end of the insulation sleeve protruding from the mounting hole is provided with a heat insulation cap, and the heat insulation cap is respectively against the heat insulation sleeve and the inner wall of the hot nozzle body.

[0005] In the above technical solution, the feed port and the gate are respectively arranged at the two ends of the hot nozzle body and are connected by a runner. During injection molding, the molten raw material enters the runner from the feed port, passes through the runner and is discharged into the mold core from the gate at the other end. A nozzle core, an insulation sleeve and a gate assembly are installed at the end of the runner close to the gate. The nozzle core, the insulation sleeve and the gate assembly are sequentially arranged from the inside to the outside. The nozzle core is made of a material with good thermal insulation performance, which can retain heat in the nozzle body, thereby ensuring the melting point of the raw material. A certain distance is maintained between the nozzle core and the insulation sleeve, thereby forming an insulation cavity for the raw material to pass through. When the raw material reaches the nozzle core, it passes through the insulation cavity formed on both sides of the nozzle core to reach the gate below. The insulation sleeve and the insulation cavity formed can keep the raw material inside warm, thereby ensuring the temperature of the raw material reaching the gate. An insulation cap is installed at the end of the insulation sleeve. After the material passes through the insulation chamber, it needs to go a short distance before reaching the gate. The insulation cap can play a role in insulation. At the same time, it can also prevent the insulation sleeve from direct contact with the hot nozzle body, reduce heat transfer and loss, and ensure the temperature of the raw material. In addition, the insulation cap can also prevent the formation of structural dead angles between the insulation sleeve and the side wall of the hot nozzle body, avoid the residual raw material causing color mixing during injection molding, and improve the injection molding quality. In addition, a pointed nozzle tip is provided at the bottom of the nozzle core, and the nozzle tip extends a certain distance from the outside of the hot nozzle body at the gate, thereby extending the insulation effect of the nozzle core on the raw material and effectively ensuring the gate temperature. At the same time, since the nozzle tip is set on the outside, the cooling rate of the molten raw material at the nozzle tip can be accelerated, thereby effectively avoiding the phenomenon of raw material drawing, ensuring a clean breakpoint, and preventing the surface of the product after injection molding from having bumps and material flowers that are easy to scratch, thereby improving the injection molding quality.

[0006] Optionally, in one embodiment, a mounting groove is provided on the outer side of the thermal insulation sleeve, and the thermal insulation cap is arranged in the mounting groove.

[0007] In the above technical solution, the installation groove is opened on one end portion of the outer side of the insulation sleeve, which is used for the thermal insulation cap to be stably installed on the insulation sleeve and reduce the space occupied in the lateral direction. At the same time, the setting of the installation groove enables the insulation sleeve to press the thermal insulation cap in the axial direction through the side of the installation groove to prevent the generation of gaps.

[0008] Optionally, in one embodiment, a portion of the heat insulation cap extends to the end surface of the thermal insulation sleeve.

[0009] In the above technical solution, a part of the insulation cap is arranged in the installation groove, and the other part extends to cover the bottom end surface of the insulation sleeve, so that the cross-section of the entire insulation cap is L-shaped, thereby protecting the end surface of the insulation sleeve, avoiding the generation of gaps and structural dead corners, and reducing the occurrence of defects such as color mixing and material flowers.

[0010] Optionally, in one embodiment, the nozzle core includes a nozzle column and an annular portion protruding from the peripheral surface of the nozzle column, the thermal insulation sleeve is provided on the nozzle column, the nozzle tip is provided at the end of the nozzle column, and the annular portion is provided with a guide hole passing through along the thickness direction.

[0011] In the above technical solution, the insulation sleeve is arranged on the outside of the nozzle column, and an insulation cavity for the raw materials to pass through is formed between the nozzle column and the annular portion protrudes and is distributed on the outside of the wire column, and is used to install the nozzle core in the mounting hole of the gate. The guide hole is used for the raw materials to pass through, so that the raw materials can smoothly enter the insulation cavity below. Its top end is against the bottom end face of the annular portion for limiting and fixing.

[0012] Optionally, in one embodiment, a tapered portion is provided at one end of the nozzle column away from the nozzle tip.

[0013] In the above technical solution, a nozzle tip is provided at the bottom end of the nozzle column and a conical portion is provided at the top end. The conical portion contacts the raw material before the raw material enters the insulation chamber for preheating. The conical structure can increase the contact area and will not cause raw material residue.

[0014] Optionally, in one embodiment, a buffer cap is provided on the outer side of the gate, and the buffer cap abuts against the side walls of the gate and the hot nozzle body respectively.

[0015] In the above technical solution, the buffer cap is made of a high-toughness composite material and is used to play a certain buffering role. Due to the high pressure during injection molding, if the gate is in direct contact with the inner wall of the hot nozzle body, long-term pressure may cause the gate or the hot nozzle body to deform, shortening the service life of the hot nozzle. The buffer cap can play a buffering role at the contact point between the gate and the hot nozzle body to protect the overall structure and extend the service life.

[0016] Optionally, in one embodiment, a portion of the buffer cap extends to an end surface of the gate.

[0017] In the above technical solution, the buffer cap covers the end face and side face where the gate is in contact with the hot nozzle body, effectively preventing the gate from directly contacting the inner wall of the hot nozzle body and enhancing the buffering effect.

[0018] Optionally, in one embodiment, the hot nozzle body further includes a heater arranged around the outer layer of the hot nozzle body.

[0019] In the above technical solution, the outer layer of the hot nozzle body is provided with a cavity for accommodating the heater, and the heater is arranged around the outside of the flow channel through the cavity. The heater is used to heat the raw material entering the flow channel to ensure its melting point.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The present application provides an insulation sleeve to form an insulation cavity between the nozzle core and the insulation sleeve, thereby insulating the raw materials and ensuring the temperature of the raw materials reaching the gate. An insulation cap is installed at the end of the insulation sleeve, which can play a role of insulation and avoid direct contact between the insulation sleeve and the hot nozzle body, reducing heat transfer and loss. At the same time, it can also eliminate the structural dead angle between the insulation sleeve and the side wall of the hot nozzle body, avoid the residual raw material causing color mixing during injection molding, and improve the injection molding quality; the nozzle tip of the nozzle core of the present application extends a certain distance from the outside of the hot nozzle body at the gate, which can extend the insulation effect of the nozzle core on the raw materials and effectively ensure the gate temperature. At the same time, since the nozzle tip is set on the outside, the cooling rate of the molten raw material at the nozzle tip can be accelerated, thereby effectively avoiding the phenomenon of raw material drawing, ensuring a clean breakpoint, and preventing bumps, material flowers, etc. that are easy to scratch the surface of the product after injection molding, thereby improving the injection molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Schematic diagram of the hot nozzle structure of one embodiment.

[0024] Figure 2 for Figure 1 Magnified view of area A in center.

[0025] Figure 3 This is a cross-sectional view of the nozzle core of this application.

[0026] Figure 4 This is a top view of the nozzle of this application.

[0027] Description of reference numerals in the figures:

[0028] 1-hot nozzle body; 11-feed port; 12-gate; 13-runner; 2-nozzle core; 21-nozzle column; 211-nozzle tip; 212-conical portion; 22-annular portion; 221-guide hole; 4-insulation sleeve; 41-insulation cavity; 42-mounting groove; 43-insulation cap; 5-gate; 51-mounting hole; 52-buffer cap; 6-heater. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] Please refer to Figures 1 to 2 In a preferred embodiment, this embodiment provides a hot nozzle structure, which includes a hot nozzle body 1, and a feed port 11 and a gate 12 arranged on the hot nozzle body 1. A runner 13 is provided inside the hot nozzle body 1, and the feed port 11 and the gate 12 are respectively located at the two ends of the runner 13. A nozzle core 2, an insulation sleeve 4 and a gate boss 5 are provided in the runner 13. The insulation sleeve 4 is sleeved on the outside of the nozzle core 2, and a gap is left between the nozzle core 2 and the inner wall of the insulation sleeve 4 to form an insulation cavity 41. The gate boss 5 is provided with a mounting hole 51, and the nozzle core 2 and the insulation sleeve 4 are inserted into the mounting hole 51. A nozzle tip 211 is provided at one end of the nozzle core 2, and the nozzle tip 211 protrudes from the gate 12 to the outside of the hot nozzle body 1. An end of the insulation sleeve 4 protruding from the mounting hole 51 is sleeved with a heat insulation cap 43, and the heat insulation cap 43 is respectively against the inner walls of the insulation sleeve 4 and the hot nozzle body 1.

[0033] In this embodiment, if Figure 1As shown, the feed port 11 and the gate 12 are respectively located at the top and bottom ends of the hot nozzle body 1, and the two are connected by a runner 13 vertically arranged inside the hot nozzle body 1. During injection molding, the molten raw material enters the runner 13 from the feed port 11, passes through the runner 13 and is discharged into the mold core from the gate 12 at the other end. A nozzle core 2, an insulation sleeve 4 and a gate boss 5 are installed at one end of the runner 13 near the gate 12. The nozzle core 2, the insulation sleeve 4 and the gate boss 5 are sequentially arranged from the inside to the outside, wherein a certain distance is maintained between the nozzle core 2 and the insulation sleeve 4, thereby forming an insulation cavity 41 for the raw material to pass through. When the raw material reaches the nozzle core 2, it passes through the insulation cavity 41 formed on both sides of the nozzle core 2 to reach the gate 12 below. The insulation sleeve 4 and the insulation cavity 41 formed can keep the raw material inside warm, thereby ensuring the temperature of the raw material reaching the gate 12. An insulation cap 43 is installed at the end of the insulation sleeve 4. The raw material passes through the insulation cavity 4 1, it still needs to go through a short distance before reaching the gate 12. The insulation cap 43 can play a role in heat insulation, and at the same time it can prevent the insulation sleeve 4 from directly contacting the hot nozzle body 1, reducing heat transfer and loss, and ensuring the temperature of the raw materials. In addition, the insulation cap 43 can also prevent the formation of structural dead angles between the insulation sleeve 4 and the side wall of the hot nozzle body 1, avoiding the residual raw material causing color mixing during injection molding, and improving the injection molding quality. In addition, a pointed nozzle tip 211 is provided at the bottom of the nozzle core 2, and the nozzle tip 211 extends a distance from the outside of the hot nozzle body 1 at the gate 12, thereby extending the insulation effect of the nozzle core 2 on the raw material and effectively ensuring the temperature of the gate 12. At the same time, since the nozzle tip 211 is set on the outside, the cooling rate of the molten raw material at the nozzle tip 211 can be accelerated, thereby effectively avoiding the phenomenon of raw material drawing, ensuring a clean breakpoint, and preventing the surface of the product after injection molding from having bumps, material flowers, etc. that are easy to scratch, thereby improving the injection molding quality.

[0034] It should be noted that the nozzle core 2 is made of a material with good thermal conductivity and good thermal insulation performance, which can retain heat in the nozzle body, thereby ensuring the melting point of the raw materials; preferably, the nozzle core 2 in this embodiment is made of medium beryllium copper.

[0035] Specifically, the thermal insulation cap 43 in this embodiment is made of polyimide (PI), which has excellent high temperature resistance and can effectively meet the thermal insulation requirements. In addition to the above materials, other materials that meet the thermal insulation requirements can also be selected, and no specific restrictions are made here.

[0036] Please refer to Figure 2 In this embodiment, a circle of mounting grooves 42 is opened on the outer periphery of the bottom end of the thermal insulation sleeve 4, and the thermal insulation cap 43 is sleeved and installed in the mounting sleeve. The thermal insulation cap 43 is stably installed on the bottom end of the thermal insulation sleeve 4 through the mounting grooves 42, and the lateral occupied space is reduced to a certain extent. At the same time, the setting of the mounting grooves 42 enables the thermal insulation sleeve 4 to press the thermal insulation cap 43 in the axial direction through the side surface of the top of the mounting grooves 42, making the installation more compact and effectively preventing the generation of gaps.

[0037] Specifically, the cross-section of the entire insulation cap 43 is L-shaped, one part of which is arranged in the installation groove 42, and the other part extends and covers the bottom end face of the insulation sleeve 4, thereby protecting the end face of the insulation sleeve 4, avoiding the generation of gaps and structural dead corners, and effectively reducing the generation of defects such as color mixing and material flowers during injection molding.

[0038] Please refer to Figures 2 to 4 In this embodiment, the nozzle core 2 includes a nozzle column 21 and an annular portion 22 protruding from the circumferential surface of the nozzle column 21. The insulation sleeve 4 is sleeved on the nozzle column 21 and maintains a certain distance from the nozzle column 21, so that an insulation cavity 41 for the passage of raw materials is formed between the inner wall of the insulation sleeve 4 and the nozzle column 21. A guide hole 221 is provided on the annular portion 22 that passes through in the thickness direction. The guide hole 221 is used for allowing the raw materials to pass through and enter the insulation cavity 41 below. The top end of the insulation sleeve 4 abuts against the bottom end surface of the annular portion 22 for limiting and fixing. The nozzle core 2 and the insulation sleeve 4 are jointly installed in the mounting hole 51 of the gate 5.

[0039] Please refer to Figures 2 to 4 In this embodiment, the nozzle tip 211 is arranged at the bottom end of the nozzle column 21 and protrudes from the outer end of the hot nozzle body 1 through the gate 12. The top of the nozzle column 21 is provided with a conical tapered portion 212. The tapered portion 212 contacts the raw material before the raw material enters the insulation chamber 41 for preheating. The conical structure can increase the contact area with the raw material, which is not easy to cause raw material residue.

[0040] Please refer to Figure 2 In this embodiment, a buffer cap 52 is provided on the outer side of the gate 5, and the buffer cap 52 is respectively against the side walls of the gate 5 and the hot nozzle body 1. The buffer cap 52 is made of a high-toughness composite material and is used to play a certain buffering role. Due to the high pressure during injection molding, if the gate 5 directly contacts the inner wall of the hot nozzle body 1, long-term pressure may cause the hot nozzle body 1 to deform, shortening the service life of the hot nozzle. The buffer cap 52 can play a buffering role at the contact point between the gate 5 and the hot nozzle body 1 to protect the overall structure and extend the service life.

[0041] Preferably, a portion of the buffer cap 52 extends to the end face of the gate 5, and the buffer cap 52 covers the end face and side face where the gate 5 contacts the hot nozzle body 1, effectively preventing the gate 5 from directly contacting the inner wall of the hot nozzle body 1 and enhancing the buffering effect.

[0042] Specifically, the gate in this embodiment is made of titanium alloy material, which has high strength and good heat resistance, meeting the needs of injection molding.

[0043] Please refer to Figure 1In this embodiment, the hot nozzle body 1 also includes a heater 6. The outer layer of the hot nozzle body 1 is provided with a cavity for accommodating the heater 6. The heater 6 is arranged outside the flow channel 13 through the cavity. The heater 6 is used to heat the raw materials entering the flow channel 13 to ensure its melting point to meet the needs of injection molding.

[0044] Specifically, the heater 6 in this embodiment is a heating wire, which is installed on the outside of the flow channel 13 in a winding manner and is used to heat the raw materials entering the flow channel 13.

[0045] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0046] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0048] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

Claims

1. A hot nozzle structure with high injection quality, comprising a hot nozzle body, and a feed port and a gate provided on the hot nozzle body, wherein a flow channel is provided inside the hot nozzle body, and the feed port and the gate are respectively located at both ends of the flow channel, characterized in that: A nozzle core, an insulation sleeve and a gate are provided in the runner, the insulation sleeve is arranged on the outside of the nozzle core, a gap is left between the nozzle core and the inner wall of the insulation sleeve and an insulation cavity is formed, the gate is provided with a mounting hole, the nozzle core and the insulation sleeve are inserted into the mounting hole, one end of the nozzle core is provided with a nozzle tip, the nozzle tip protrudes from the gate to the outside of the hot nozzle body, the end of the insulation sleeve protruding from the mounting hole is provided with a heat insulation cap, and the heat insulation cap is respectively against the inner wall of the insulation sleeve and the hot nozzle body.

2. The hot nozzle structure with high injection quality according to claim 1, characterized in that: An installation groove is provided on the outer side of the heat-insulating sleeve, and the heat-insulating cap is arranged in the installation groove.

3. The hot nozzle structure with high injection molding quality according to claim 2, characterized in that: A portion of the heat insulation cap extends to the end surface of the heat insulation sleeve.

4. The hot nozzle structure with high injection molding quality according to claim 1, characterized in that: The nozzle core includes a nozzle column and an annular portion protruding from the peripheral surface of the nozzle column. The insulation sleeve is sleeved on the nozzle column. The nozzle tip is arranged at the end of the nozzle column. The annular portion is provided with a guide hole penetrating along the thickness direction.

5. The hot nozzle structure with high injection molding quality according to claim 4, characterized in that: A tapered portion is provided at one end of the nozzle column away from the nozzle tip.

6. The hot nozzle structure with high injection molding quality according to claim 1, characterized in that: A buffer cap is sleeved on the outer side of the gate, and the buffer cap abuts against the side walls of the gate and the hot nozzle body respectively.

7. The hot nozzle structure with high injection molding quality according to claim 6, characterized in that: A portion of the buffer cap extends to an end surface of the gate.

8. The hot nozzle structure with high injection molding quality according to claim 1, characterized in that: The hot nozzle body further includes a heater arranged around the outer layer of the hot nozzle body.

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