A thermal nozzle having an improved spiral nozzle core structure

Abstract

The utility model discloses a hot nozzle with improved spiral nozzle core structure, the nozzle body is equipped with the nozzle body runner and positioning cavity that intercommunication, nozzle core subassembly includes straight-through nozzle core and spiral nozzle core, straight-through nozzle core has the cavity that penetrates its ontology and its end portion is close -mouthed, spiral nozzle core has the guide hole, and is equipped with a plurality of spiral runner, spiral nozzle core sets up on straight-through nozzle core, and spiral runner is located in the cavity, nozzle head is sleeved on straight-through nozzle core, and the upper portion of nozzle head is fixed in the positioning cavity, the end portion of straight-through nozzle core protrudes from nozzle head, the valve needle passes through the nozzle body runner and can be slidable in the guide hole, and the end portion can extend nozzle core subassembly. The utility model spiral nozzle core and nozzle head between increase straight-through nozzle core, the end portion of straight-through nozzle core protrudes from nozzle head, and it is directly connected with the gate position after extending into the mould core, can separate the flow path of molten material with the mould core, and the runner has no dead angle, no gum, and the smoothness is not affected by the mould core, effectively improves the problem of different colors.

Description

Technical Field

[0001] This utility model relates to the field of injection molding hot nozzle device technology, and in particular to a hot nozzle with an improved spiral nozzle core structure. Background Technology

[0002] Hot nozzles are widely used in product injection molding. The nozzle core can be set as a spiral nozzle core to achieve uniform mixing and dispersion of molten material. The spiral nozzle core is generally fixed to the nozzle body through the nozzle head. For example, in the prior art, hot nozzle, hot runner system and hot runner mold with application number 202022279225.9, the nozzle body, nozzle head and nozzle core are specifically disclosed. The outer peripheral surface of the nozzle core is provided with multiple spiral blades. The nozzle core is fixed to the nozzle body through the nozzle head. The molten material flows out from the nozzle head after passing through the nozzle core. However, in some molds, the gate is located at a certain depth inside the mold core. For example, with the hot nozzle mentioned above, after the nozzle head is positioned against the mold core, there is still a certain distance between the outlet of the molten material and the gate position on the mold core. Therefore, after the molten material flows out of the hot nozzle, it will directly rush onto the mold core. The surface finish of the mold core will be affected by the material from the previous batch of injection molding, and it is particularly prone to problems such as yellowing and blackening. Furthermore, the molten material flowing directly on the mold core will cause a large amount of heat to be transferred to the mold core, resulting in excessively high mold core temperature around the gate position, which will affect the appearance of the product. In addition, the heat damage to the molten material will also increase its flow resistance, leading to uneven mixing of the molten material and problems such as weld lines on the product surface. Utility Model Content

[0003] The purpose of this invention is to provide a hot nozzle with an improved spiral nozzle core structure. A straight nozzle core is added between the spiral nozzle core and the nozzle head. The end of the straight nozzle core is constricted and protrudes from the nozzle head. After extending into the mold core, it directly connects with the gate position, which can separate the flow path of the molten material from the mold core. The flow channel has no dead corners, no glue accumulation, and the smoothness is not affected by the mold core, effectively improving the problem of color difference.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a hot nozzle with an improved spiral nozzle core structure, comprising: The mouthpiece has interconnected flow channels and positioning cavities. A nozzle assembly includes at least a straight nozzle and a spiral nozzle. The straight nozzle has a cavity penetrating its body and its end is tapered. The spiral nozzle has a guide hole penetrating its body and is provided with multiple spiral channels. The spiral nozzle is disposed on the straight nozzle, and the spiral channels are located within the cavity. A nozzle is fitted onto the straight nozzle core. The upper part of the nozzle is fixed inside the positioning cavity, and the lower part protrudes out of the positioning cavity. The nozzle body flow channel, the spiral flow channel, and the cavity are connected. The end of the straight nozzle core protrudes out of the nozzle. A valve needle passes through the nozzle body flow channel and is slidably disposed within the guide hole, with its end extending out of the nozzle core assembly.

[0005] As a further optimization, the spiral nozzle core is provided with multiple flow channel holes, and its sidewall is provided with spiral grooves that match the number of flow channel holes. The flow channel holes and the spiral grooves are connected to form the spiral flow channel.

[0006] As a further optimization, the upper end of the spiral nozzle is provided with a first positioning ring, and the upper end of the straight nozzle is provided with a second positioning ring. The first positioning ring abuts against the second positioning ring so that the spiral flow channel is embedded in the cavity.

[0007] As a further optimization, the positioning cavity is provided with a first limiting step, and the end of the first positioning ring away from the second positioning ring abuts against the first limiting step; the nozzle is provided with a supporting limiting step, and the end of the second positioning ring away from the first positioning ring abuts against the supporting limiting step.

[0008] As a further optimization, the positioning cavity is provided with a second positioning step, and the nozzle is provided with an abutting step, which abuts against the second positioning step.

[0009] As a further optimization, the through nozzle core is made of beryllium copper.

[0010] As a further optimization, the nozzle assembly also includes a heat insulation cap. The end of the straight nozzle is provided with a slot, and the heat insulation cap is snapped into the slot and protrudes from the straight nozzle. The heat insulation cap abuts against the mold core to avoid the problem of glue accumulation.

[0011] As a further optimization, the heat-insulating cap is made of rubber.

[0012] As a further optimization, a heater is provided on the periphery of the nozzle body to ensure the fluidity of the molten material through heating.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. A straight-through nozzle is added between the spiral nozzle core and the nozzle head. The end of the straight-through nozzle core is tapered and protrudes from the nozzle head. After extending into the mold core, it directly connects with the gate position. Before entering the gate position, the movement path of the molten material is located inside the nozzle core assembly. During injection molding, the flow path of the molten material can be separated from the mold core. There are no dead corners in the runner, no glue trapping, and the surface finish is not affected by the mold core, effectively improving the problem of color difference. 2. In one specific embodiment, the straight nozzle core is provided with a heat insulation cap, which can abut against the mold core to prevent burns on the product surface and avoid glue accumulation between it and the mold core, thus avoiding problems such as discoloration and material defects. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] Figure 2 This is a schematic diagram of the assembly of the mouthpiece body, mouthpiece core assembly and mouthpiece head of this utility model.

[0016] Figure 3 This is a schematic diagram of the assembly of the nozzle core assembly of this utility model.

[0017] Figure 4 This is a schematic diagram of the spiral nozzle core of this utility model.

[0018] Figure 5 This is a schematic diagram showing the initial mold-closing stage when applying this utility model.

[0019] Figure 6 A schematic diagram showing the state of the nozzle core assembly and valve needle at the initial stage of mold application of this utility model.

[0020] Figure 7 A schematic diagram of injection molding after mold closing when applying this utility model.

[0021] Figure 8 A schematic diagram showing the state of the nozzle core assembly and valve needle during injection molding after mold closing when applying this utility model. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figures 1 to 4As shown, a hot nozzle with an improved spiral nozzle core structure includes a nozzle body 10, a nozzle core assembly 20, a nozzle head 30, and a valve needle 40. The nozzle body 10 has a nozzle body flow channel 100 and a positioning cavity 101 located below and connected to the nozzle body flow channel 100. The nozzle core assembly 20 includes at least a spiral nozzle core 21 and a straight nozzle core 22. The straight nozzle core 22 has a cavity 220 penetrating its body, and its end (lower end) is tapered. The spiral nozzle core 21 has a guide hole 210 penetrating its body for the valve needle to pass through, and is provided with multiple spiral flow channels. 211, the spiral nozzle core 21 is disposed on the straight nozzle core 22, and the spiral flow channel 211 is located in the cavity 220. The nozzle head 30 is sleeved on the straight nozzle core 22. The upper part of the nozzle head 30 is fixed in the positioning cavity 101 and the lower part protrudes out of the positioning cavity 101, thereby fixing the nozzle core assembly 20 to the nozzle body 10, so that the nozzle body flow channel 100, the spiral flow channel 211 and the cavity 220 are connected. The end of the straight nozzle core 22 protrudes out of the nozzle head 30. The valve needle 40 passes through the nozzle body flow channel 100 and is slidably disposed in the guide hole 210, and its end can extend out of the nozzle core assembly 22.

[0024] In this invention, the spiral nozzle core 21 and the straight nozzle core 22 together form the nozzle core assembly 20, and the spiral flow channel 211 is connected to the cavity 220. When the nozzle core assembly 20 is installed in the positioning cavity 101 of the nozzle body 10 through the nozzle head 30, the nozzle body flow channel 100, the spiral flow channel 210 and the cavity 220 are connected to form a flow path for the molten material. The molten material enters the hot nozzle through the nozzle body flow channel 100 and then enters the spiral flow channel 211 of the spiral nozzle core 21. The guide at 1 forms multiple dispersed fluid streams. The fluid spirals downwards within cavity 220. When it reaches the end of spiral channel 211, its path has a certain inclination. The constricted structure at the lower end of the straight nozzle 22 allows it to collide with the fluid, thus dispersing and agitating the molten material. Simultaneously, it helps to gather the molten material, ensuring that the constricted end of the straight nozzle 22 accurately and smoothly enters the gate position on the mold core. Combined with... Figures 5 to 8As shown, in some molds, the gate position 500 on the mold core 50 is located at a certain depth on the mold core 50. When this utility model is applied, since the end of the straight nozzle core 22 protrudes from the nozzle head 30, after the nozzle head 30 abuts against the mold core 50 to position the hot nozzle, the end of the straight nozzle core 22 can continue to extend along the inclined sidewall 50a on the mold core 50 until the end of the straight nozzle core 22 is above the gate position 500. At the beginning of mold closing, the valve needle 40 extends out of the end of the straight nozzle core 22 and into the gate position 500. At this time, the molten material cannot enter the gate position 500. When injection molding is performed, the valve needle 40 is driven to move upward until its lower end is located in the guide hole 210. Then the molten material enters the gate position 500 through the end of the straight nozzle core 22, thereby performing injection molding. When the molten material passes through the nozzle body flow channel 100, the spiral flow channel 211 and the cavity 220, the straight nozzle core 22... The constricted end prevents the molten material from flowing onto the inclined sidewall 50a of the mold core 50 before entering the gate position 500. Instead, it flows directly into the gate position 500 along the straight nozzle core 22. This avoids problems such as yellowing or blackening of the injection molded product caused by the surface finish of the mold core 50. Furthermore, the fact that the molten material does not come into contact with the inclined sidewall 50a of the mold core 50 prevents a large amount of heat from being transferred to the mold core 50. This avoids overheating of the mold core 50, which could lead to burns or bright marks on the product surface. It also prevents heat loss of the molten material, which could increase its flow resistance and cause uneven mixing of the multiple fluids flowing out through the spiral nozzle core 21, resulting in weld lines on the product surface. After injection molding is completed, the valve needle 40 is driven through the guide hole 210 and the end of the straight nozzle core 22 to extend into the gate position 500, and then the mold is opened and the product is demolded.

[0025] This invention adds a straight-through nozzle 22 between the spiral nozzle core 21 and the nozzle head 30. The end of the straight-through nozzle core 22 is constricted and protrudes from the nozzle head 30, allowing it to extend into the mold core 50 and directly connect with the gate position 500. During injection molding, the straight-through nozzle core 22 separates the flow path of the molten material from that of the mold core 50. Before entering the gate position 500, the movement path of the molten material is entirely within the nozzle core assembly 20, resulting in a flow channel without dead corners, no glue accumulation, and a smooth surface unaffected by the mold core, effectively improving the problem of color variation. Preferably, the material of the straight nozzle core 22 can be changed according to the production trial molding situation, thereby changing its thermal conductivity and adjusting the internal temperature of the nozzle core assembly 20 to avoid local overheating or cold material problems, and achieve temperature control. In one embodiment, the straight nozzle core 22 is made of beryllium copper, which can ensure that the temperature of the molten material inside the nozzle core assembly 20 is normal, so that after the molten material is diverted by the spiral nozzle core 21, it is fully fused between the spiral nozzle core 21 and the straight nozzle core 22, which can effectively improve problems such as weld lines and black streaks.

[0026] Regarding the specific structure of the spiral nozzle core 21, it is provided with multiple flow channel holes 2111, and its side wall is provided with spiral grooves 2112 that match the number of flow channel holes 2111. The flow channel holes 2111 and the spiral grooves 2112 are connected to form a spiral flow channel 211. Specifically, after the molten material flows through the nozzle body flow channel 100, it is dispersed into each flow channel hole 2111, and then forms multiple streams of fluid through the multiple spiral grooves 2112.

[0027] Specifically, in the nozzle assembly 20, the upper end of the spiral nozzle 21 is provided with a first positioning ring 21a, and the upper end of the straight nozzle 22 is provided with a second positioning ring 22a. The first positioning ring 21a abuts against the second positioning ring 22a, so that the spiral flow channel 211 is embedded in the cavity 220 to ensure the accuracy of the position between the two. The positioning cavity 101 is provided with a first limiting step 10a. The end of the first positioning ring 21a away from the second positioning ring 22a abuts against the first limiting step 10a. The nozzle head 30 is provided with a supporting limiting step 30a. The end of the second positioning ring 22a away from the first positioning ring 21a abuts against the supporting limiting step 30a. The nozzle assembly 20 is positioned on the nozzle body 10 by screwing the nozzle head 30 to the nozzle body 10, which can ensure the accuracy and stability of the position of the spiral nozzle 21 and the straight nozzle 22.

[0028] Preferably, a second positioning step 10b is provided in the positioning cavity 101 below the first positioning step 10a, and an abutment step 30b is provided on the nozzle 30. When the nozzle 30 is screwed onto the nozzle body 10, the abutment step 30b abuts against the second positioning step 10b to ensure the accurate positioning of the nozzle 30.

[0029] In another embodiment, the nozzle assembly 20 further includes a heat insulation cap 23. The end of the straight nozzle 22 is provided with a groove 221. The heat insulation cap 23 is snapped into the groove 221 and protrudes from the straight nozzle 22. Adding a heat insulation cap 23 to the front end of the straight nozzle 22 can prevent burns on the product surface. Preferably, the heat insulation cap 23 is made of rubber and is press-fitted into the groove 221. It has an extended allowance in the height direction and can hold the mold core 50, which can prevent the accumulation of glue between it and the mold core 50, thus avoiding problems such as discoloration and material defects.

[0030] In addition, heaters, such as heating wires, are provided on the side walls of the nozzle body 10 to ensure the flowability of molten material within the nozzle body 10 and the nozzle core assembly 20.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A hot nozzle with an improved spiral nozzle core structure, characterized in that, include: The mouthpiece has interconnected flow channels and positioning cavities. A nozzle assembly includes at least a straight nozzle and a spiral nozzle. The straight nozzle has a cavity penetrating its body and its end is tapered. The spiral nozzle has a guide hole penetrating its body and is provided with multiple spiral channels. The spiral nozzle is disposed on the straight nozzle, and the spiral channels are located within the cavity. A nozzle is fitted onto the straight nozzle core. The upper part of the nozzle is fixed inside the positioning cavity, and the lower part protrudes out of the positioning cavity. The nozzle body flow channel, the spiral flow channel, and the cavity are connected. The end of the straight nozzle core protrudes out of the nozzle. A valve needle passes through the nozzle body flow channel and is slidably disposed within the guide hole, with its end extending out of the nozzle core assembly.

2. The hot nozzle with an improved spiral nozzle core structure according to claim 1, characterized in that, The spiral nozzle core is provided with multiple flow channel holes, and its side wall is provided with spiral grooves that match the number of flow channel holes. The flow channel holes and the spiral grooves are connected to form the spiral flow channel.

3. The hot nozzle with an improved spiral nozzle core structure according to claim 1 or 2, characterized in that, The upper end of the spiral nozzle is provided with a first positioning ring, and the upper end of the straight nozzle is provided with a second positioning ring. The first positioning ring abuts against the second positioning ring so that the spiral flow channel is embedded in the cavity.

4. The hot nozzle with an improved spiral nozzle core structure according to claim 3, characterized in that, The positioning cavity is provided with a first limiting step, and the end of the first positioning ring away from the second positioning ring abuts against the first limiting step; the nozzle is provided with a supporting limiting step, and the end of the second positioning ring away from the first positioning ring abuts against the supporting limiting step.

5. The hot nozzle with an improved spiral nozzle core structure according to claim 4, characterized in that, The positioning cavity is provided with a second positioning step, and the nozzle is provided with an abutting step, which abuts against the second positioning step.

6. The hot nozzle with an improved spiral nozzle core structure according to claim 1, characterized in that, The straight nozzle core is made of beryllium copper.

7. The hot nozzle with an improved spiral nozzle core structure according to claim 1, characterized in that, The nozzle assembly also includes a heat insulation cap, and the end of the straight nozzle is provided with a slot, the heat insulation cap being snapped into the slot and protruding from the straight nozzle.

8. The hot nozzle with an improved spiral nozzle core structure according to claim 7, characterized in that, The heat-insulating cap is made of rubber.

9. The hot nozzle with an improved spiral nozzle core structure according to claim 1, characterized in that, The nozzle is equipped with a heater on its surrounding side wall.

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