Hot runner structure

Abstract

The utility model discloses a hot runner structure which comprises a material guide mechanism, a nozzle core, a first mold core and a second mold core, a first material channel penetrates through the material guide mechanism, a heating assembly is sleeved on the outer side of the material guide mechanism, the material guide mechanism is arranged in a mounting groove and fixedly connected with the mounting groove, and a butt joint groove communicated with the first material channel is formed in the material guide mechanism. A second material channel penetrates through the nozzle core, a plurality of branches extend from the outer side of the nozzle core, first runners communicated with the second material channel are formed in the branches, a first cavity is formed in the first mold core, a second cavity is formed in the second mold core, a plurality of second runners are formed in the second cavity, and a plurality of second forming cavities are formed in the second mold core; the first mold core and the second mold core are combined, the branch is arranged between the first cavity and the second cavity, the material guide mechanism penetrates into the first cavity, and the nozzle core is arranged in the butt joint groove. According to the hot runner structure provided by the utility model, the solidification speed of a sizing material in the runner is slowed down, and a plurality of products can be formed in single injection molding.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, and in particular to a hot runner structure. Background Technology

[0002] In injection molding of small plastic products, molds often adopt a hot nozzle to cold runner structure design. The hot nozzle maintains the fluidity of the molten plastic material and delivers it to the molding cavity through the cold runner to complete the filling. In the existing technology, such molds are limited by the inherent characteristics of the cold runner system. Only one product can be molded in a single injection. The cold runner solidifies rapidly after the plastic material is filled, which restricts the production of only one product in each molding cycle.

[0003] This process has significant drawbacks. For products with small volume and large batch demand, the single-cavity molding mode requires repeated high-frequency injection operations, which significantly limits equipment utilization and production efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a hot runner structure that slows down the solidification speed of the rubber material in the runner, thereby enabling the molding of multiple products in a single injection molding process.

[0005] The technical solution adopted by the hot runner structure disclosed in this utility model is:

[0006] The device includes a material guiding mechanism, a nozzle, a first mold core, and a second mold core. The material guiding mechanism has a first material channel running through it, and a heating component is fitted around its outer side. The material guiding mechanism is fixedly connected within an installation groove and has a docking groove communicating with the first material channel. The nozzle has a second material channel running through it, and multiple branches extend from its outer side. Each branch has a first flow channel communicating with the second material channel. The first mold core has a first cavity, and the second mold core has a second cavity with multiple second flow channels within it. The second mold core also has multiple second molding cavities communicating with the second flow channels. The first and second mold cores are merged. The branches are positioned between the first and second cavities, and the first and second flow channels communicate with each other. The material guiding mechanism is inserted into the first cavity, and the nozzle is placed within the docking groove. The first and second material channels communicate with each other.

[0007] As a preferred embodiment, the second flow channel is located between two adjacent second molding cavities, the second molding cavity is connected to the second flow channels on both sides, and both sides of the branch extend into a fork, with a nozzle tip extending from the fork, the nozzle tip facing the connection between the second molding cavity and the second flow channel.

[0008] As a preferred embodiment, a base plate is fixedly connected to the bottom of the nozzle core, the base plate covers the first flow channel, a support block is installed in the second cavity, the support block touches the base plate, a first gap is spaced between the nozzle core and the first cavity, and a second gap is spaced between the nozzle core and the second cavity.

[0009] As a preferred embodiment, the first mold core has multiple first molding cavities running through it, the first molding cavities are connected to the first cavity, the tip of the nozzle faces the connection between the first molding cavity and the first cavity, the first molding cavity is connected to the second molding cavity, an insert is embedded in the first molding cavity, and the insert is away from the second mold core.

[0010] As a preferred embodiment, the material guiding mechanism includes a first nozzle and a second nozzle, the bottom of the first nozzle is fixedly connected to the top of the second nozzle, the docking groove is located at the bottom of the second nozzle, the first material channel passes through the first nozzle and the second nozzle, and the bottom of the second nozzle enters the first cavity.

[0011] As a preferred embodiment, the heating assembly includes a first heat-conducting pipe and a second heat-conducting pipe. The first heat-conducting pipe is sleeved on the outside of the first nozzle, and a first heating wire is embedded on the outside of the first heat-conducting pipe. The second heat-conducting pipe is sleeved on the outside of the second nozzle, and a second heating wire is embedded on the outside of the second heat-conducting pipe.

[0012] As a preferred embodiment, an insulation tube is sleeved on the outside of the second heat-conducting tube, and a groove is formed on the insulation tube, through which the second heating wire passes.

[0013] The beneficial effects of the hot runner structure disclosed in this utility model are:

[0014] The material guiding mechanism is heated by the heating component to keep it at a high temperature. Since the material guiding mechanism wraps around part of the nozzle core through the docking groove, the heat is directed to the nozzle core. When the external injection molding mechanism injects the rubber into the second flow channel through the first and second material channels, the material guiding mechanism and nozzle core can keep the rubber warm and slow down the solidification speed of the rubber in the flow channel.

[0015] Under the above-mentioned heat preservation measures, the rubber material maintains high flowability with low viscosity, allowing it to be injected into the molding cavity through multiple second and first flow channels. This enables the simultaneous molding of multiple products in a single injection cycle, improving the production efficiency of injection molding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a hot runner structure according to the present invention.

[0017] Figure 2 This is a schematic diagram of the installation of the material guiding mechanism of a hot runner structure according to this utility model.

[0018] Figure 3 This is a schematic diagram of the first template structure of a hot runner structure according to this utility model.

[0019] Figure 4 This is a schematic diagram of the installation of the first nozzle and the second nozzle of the hot runner structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the installation of a heating component with a hot runner structure according to this utility model.

[0021] Figure 6 This is a cross-sectional view of a hot runner structure according to the present invention.

[0022] Figure 7 This is a cross-sectional view of the first and second mold cores of a hot runner structure according to this utility model.

[0023] Figure 8 This is a schematic diagram of the installation of the first and second mold cores of a hot runner structure according to this utility model.

[0024] Figure 9 This is a schematic diagram of the nozzle core installation of a hot runner structure according to this utility model.

[0025] Figure 10 This is a cross-sectional view of the molding cavity of a hot runner structure according to this utility model.

[0026] Figure 11 This utility model relates to a hot runner structure. Figure 10 (Area A) Enlarged view. Detailed Implementation

[0027] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0028] Please refer to Figures 1-6 .

[0029] The present invention discloses a hot runner structure, including a material guiding mechanism 2, a first mold core 3, a second mold core 4, and a nozzle core 5;

[0030] The material guiding mechanism 2 includes a first nozzle 21 and a second nozzle 22; the top of the first nozzle 21 is provided with a limiting ring 211, the bottom of the first nozzle 21 is fixedly connected to the top of the second nozzle 22, and the bottom of the second nozzle 22 is provided with a docking groove 221; a first material channel 212 passes through the material guiding mechanism 2, the first material channel 212 passes through the first nozzle 21 and the second nozzle 22, the docking groove 221 communicates with the first material channel 212, and the lateral dimension of the docking groove 221 is larger than the lateral dimension of the first material channel 212;

[0031] Furthermore, a heating assembly 23 is sleeved on the outside of the material guiding mechanism 2. The heating assembly 23 includes a first heat-conducting pipe 231 and a second heat-conducting pipe 233. The first heat-conducting pipe 231 is sleeved on the outside of the first nozzle 21. The bottom of the first heat-conducting pipe 231 touches the top of the second nozzle 22, and the top of the first heat-conducting pipe 231 touches the bottom of the limiting ring 211. A first heating wire 232 is embedded on the outside of the first heat-conducting pipe 231. One end of the first heating wire 232 is arranged around the outside of the first heat-conducting pipe 231.

[0032] Furthermore, the second heat-conducting pipe 233 is sleeved on the outside of the second nozzle 22, and an insulation pipe 235 is sleeved on the outside of the second heat-conducting pipe 233. The top and bottom of the second heat-conducting pipe 233 respectively contact the second nozzle 22 and the insulation pipe 235. A groove is opened on the insulation pipe 235, and a pin 236 is embedded in the insulation pipe 235. A second heating wire 234 is embedded on the outside of the second heat-conducting pipe 233. One end of the second heating wire 234 is arranged around the outside of the second heat-conducting pipe 233, and the other end of the second heating wire 234 passes through the groove.

[0033] Please refer to Figure 1 , Figure 2 and Figure 6 .

[0034] A mold base 1 is sleeved on the outside of the heating component 23. The mold base 1 is composed of a first template 11 and a second template 12 joined together. An installation groove is passed through the mold base 1, which passes through the first template 11 and the second template 12. An annular step is provided in the installation groove of the first template 11, and a positioning hole is provided on the annular step. A wire groove 111 is provided on the top of the first template 11, and the wire groove 111 communicates with the installation groove.

[0035] Furthermore, a positioning groove is provided on the mold base 1, which is located at the bottom of the second template 12, and the mounting groove is connected to the positioning groove; a base is provided at the bottom of the mold base 1, the top of the base touches the bottom of the mold base 1, and the base covers the positioning groove.

[0036] The material guiding mechanism 2 is placed in the mounting groove, the first nozzle 21 and the second nozzle 22 are both placed in the mounting groove, the limiting ring 211 touches the edge of the mounting groove, and the limiting ring 211 is fixedly connected to the top of the first template 11.

[0037] Furthermore, both the first template 11 and the second template 12 are fitted onto the outside of the insulation pipe 235 through the installation groove. The insulation pipe 235 is snapped into the annular step, and the pin 236 is slidably inserted into the positioning hole for fixation. The limiting ring 211 and the annular step constrain the material guiding mechanism 2 in the installation groove, and the pin 236 constrains the material guiding mechanism 2 to prevent rotation.

[0038] Furthermore, the other end of the first heating wire 232 and the other end of the second heating wire 234 both pass through the wire groove 111 and lead out to the outside of the mold base 1, and are electrically connected to the external power supply, thereby energizing the first heating wire 232 and the second heating wire 234, so that the first heating wire 232 and the second heating wire 234 heat the first nozzle 21 and the second nozzle 22 respectively.

[0039] Please refer to Figures 6-11 .

[0040] The bottom of the first mold core 3 is provided with a first cavity 31, and the top of the first mold core 3 is provided with a first molding cavity 32. The first molding cavity 32 penetrates the first mold core 3. In this embodiment, it is preferred that there are eight first molding cavities 32, and the eight first molding cavities 32 are arranged around the center of the first mold core 3 at intervals.

[0041] Furthermore, the first molding cavity 32 is connected to the first cavity, and there are two points on the first molding cavity 32 that are connected to the first cavity, located on both sides of the first molding cavity 32 respectively; an insert 321 is embedded in the first molding cavity 32, and the insert 321 is far away from the second mold core 4.

[0042] The top of the second mold core 4 is provided with a second cavity 41, and multiple second flow channels 412 are provided in the second cavity 41. In this embodiment, it is preferred that there are eight second flow channels 412, and the eight second flow channels 412 surround the outside of the second cavity 41. A support block 411 is provided in the second cavity 41, and the support block 411 is located at the center of the second cavity 41.

[0043] Furthermore, the top of the second mold core 4 is provided with a plurality of second molding cavities 42. In this embodiment, it is preferred that there are eight second molding cavities 42, which are arranged at intervals around the center of the second mold core and penetrate the second mold core 4. The second flow channel is located between two adjacent second molding cavities 42, and the second molding cavity 42 is connected to the second flow channels on both sides.

[0044] Furthermore, the first mold core 3 is covered on the second mold core 4, the second flow channel 412 and the second cavity 41 are both connected to the first cavity 31, and the first molding cavity 32 is connected to the second molding cavity 42.

[0045] Furthermore, the connection between the first molding cavity 32 and the first cavity, and the connection between the second molding cavity 42 and the second flow channel, are combined to form an injection hole 322. Since the second flow channel 412 is located between two adjacent second molding cavities 42, the two adjacent second flow channels 412 can simultaneously inject adhesive into the first molding cavity 32 and the second molding cavity 42. This can balance the flow rate of adhesive into the first molding cavity 32 and the second molding cavity 42 and the process of adhesive cooling and shrinkage, thereby reducing the problem of uneven stress distribution in the product.

[0046] The nozzle core 5 has a second material channel 531 extending through it, and multiple branches 51 extend from the outer side of the nozzle core 5. In this embodiment, it is preferred that there are eight branches 51. Both sides of the branches 51 extend into forks, and nozzle tips 511 extend from the forks. A first flow channel 512 is opened on the branch 51, and the first flow channel 512 is connected to the second material channel 531. A base plate 52 is fixedly connected to the bottom of the nozzle core 5, and the base plate 52 covers the first flow channel 512.

[0047] The nozzle 5 is placed between the first cavity 31 and the second cavity 41. The support block 411 touches the bottom of the base plate 52 of the nozzle 5, so that the nozzle 5 is suspended in the first cavity 31 and the second cavity 41, so that there is a first gap between the nozzle 5 and the first cavity 31 and a second gap between the nozzle 5 and the second cavity 41; the second flow channel 412 is connected to the first flow channel 512, and the nozzle tip 511 faces the glue injection hole 322;

[0048] The first mold core 3 and the second mold core 4 are both placed in the positioning groove, and the top of the base touches the bottom of the second mold core 4; the bottom of the second nozzle 22 penetrates the first mold core 3, so that the bottom of the second nozzle 22 enters the first cavity 31, the nozzle core 5 is placed in the docking groove 221, and the first material channel 212 is connected to the second material channel 531; the outer side of the second nozzle 22 is sealed to the first mold core 3 to prevent the adhesive in the first cavity 31 from overflowing from the gap between the second nozzle 22 and the first mold core 3.

[0049] Please refer to Figures 1-11 .

[0050] Preparations before injection molding:

[0051] By energizing the first heating wire 232 and the second heating wire 234, the first heating wire 232 and the second heating wire 234 heat the first heat pipe 231 and the second heat pipe 233 respectively, and introduce the heat into the first nozzle 21 and the second nozzle 22. At the same time, since the nozzle core 5 is wrapped in the docking groove 221 by the second nozzle 22, the second nozzle 22 transfers heat to the nozzle core 5. When the external injection molding mechanism injects the rubber material into the first material channel 212, the second material channel 531 and the first flow channel 512 in sequence, the first nozzle 21, the second nozzle 22 and the nozzle core 5 can effectively keep the rubber material warm, so that the rubber material can maintain high flowability with low viscosity flow characteristics.

[0052] Because there is a first gap and a second gap between the first mold core 3 and the second mold core 4, after the rubber material is injected into the second flow channel 412 through the first flow channel 512, the rubber material first fills the first gap and the second gap and forms a semi-molten state. The semi-molten rubber material isolates the nozzle core 5 from the contact between the first mold core 3 and the second mold core 4, further improving the heat preservation effect of the nozzle core 5.

[0053] After completing the above preparations, the injection molding process can begin:

[0054] The external injection molding mechanism injects the rubber material again. The rubber material in the first flow channel 512 enters the first molding cavity 32 and the second molding cavity 42 through the second flow channel 412 and the injection hole 322. The nozzle tip 511 can guide the rubber material into the injection hole 322. Because the rubber material can maintain high flowability, when the first flow channel 512 is increased to eight, the rubber material can also enter the first molding cavity 32 and the second molding cavity 42 through the first flow channel 512 and the second flow channel 412, thereby completing the synchronous molding of eight products in a single injection cycle and improving the production efficiency of injection molding.

[0055] refer to Figure 10 Because the molding cavity of the second mold core 4 has a narrow top and wide bottom structure, during demolding, the second mold core 4 is pulled out of the positioning groove. The second mold core 4 pulls the solidified product out of the first molding cavity 32. Since the nozzle tip 511 can also keep the rubber material around the injection hole 322 warm, the rubber material in the injection hole 322 is in a semi-molten state. When the product is pulled out of the first molding cavity 32, the gate can be completely disconnected from the product, avoiding the product from being pulled out of the guide mechanism 2 by the solidified gate. When the product is then pulled out of the second molding cavity 42, the gate can be completely disconnected from the product and remain on the second mold core 4, which facilitates the recovery of the gate and the semi-molten rubber material remaining on the second mold core 4, reducing the waste of rubber material.

[0056] This utility model provides a hot runner structure. The material guiding mechanism is heated by a heating component to keep it at a high temperature. Since the material guiding mechanism wraps around a portion of the nozzle core through a docking groove, heat is directed to the nozzle core. When the external injection molding mechanism injects the rubber material into the second runner through the first and second material channels, the material guiding mechanism and the nozzle core can keep the rubber material warm and slow down the solidification speed of the rubber material in the runner.

[0057] Under the above-mentioned heat preservation measures, the rubber material maintains high flowability with low viscosity, allowing it to be injected into the molding cavity through multiple second and first flow channels. This enables the simultaneous molding of multiple products in a single injection cycle, improving the production efficiency of injection molding.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A hot runner structure, characterized in that, include A material guiding mechanism, wherein a first material channel runs through the material guiding mechanism, a heating component is sleeved on the outside of the material guiding mechanism, the material guiding mechanism is fixedly connected in an installation groove, and a docking groove communicating with the first material channel is opened on the material guiding mechanism; The nozzle has a second material channel running through it, and multiple branches extend from the outer side of the nozzle. Each branch has a first flow channel that communicates with the second material channel. A first mold core, wherein a first cavity is formed on the first mold core; The second mold core has a second cavity, and multiple second flow channels are formed inside the second cavity. The second mold core also has multiple second molding cavities, and the second molding cavities are connected to the second flow channels. The first mold core and the second mold core are merged, the branch is placed between the first cavity and the second cavity, the first flow channel and the second flow channel are connected, the material guiding mechanism is inserted into the first cavity, the nozzle is placed in the docking groove, and the first material channel and the second material channel are connected.

2. The hot runner structure as described in claim 1, characterized in that, The second flow channel is located between two adjacent second molding cavities. The second molding cavity is connected to the second flow channels on both sides. Both sides of the branch extend into a fork, and a nozzle tip extends from the fork, with the nozzle tip facing the connection between the second molding cavity and the second flow channel.

3. A hot runner structure as described in claim 2, characterized in that, The bottom of the nozzle is fixedly connected to a base plate, which covers the first flow channel. A support block is installed in the second cavity, and the support block touches the base plate. There is a first gap between the nozzle and the first cavity, and a second gap between the nozzle and the second cavity.

4. A hot runner structure as described in claim 3, characterized in that, The first mold core has multiple first molding cavities running through it. The first molding cavity is connected to the first cavity. The tip of the nozzle faces the connection between the first molding cavity and the first cavity. The first molding cavity is connected to the second molding cavity. An insert is embedded in the first molding cavity. The insert is away from the second mold core.

5. A hot runner structure as described in any one of claims 1 or 4, characterized in that, The material guiding mechanism includes a first nozzle and a second nozzle. The bottom of the first nozzle is fixedly connected to the top of the second nozzle. The docking groove is located at the bottom of the second nozzle. The first material channel passes through the first nozzle and the second nozzle. The bottom of the second nozzle enters the first cavity.

6. A hot runner structure as described in claim 5, characterized in that, The heating assembly includes a first heat-conducting pipe and a second heat-conducting pipe. The first heat-conducting pipe is sleeved on the outside of the first nozzle, and a first heating wire is embedded on the outside of the first heat-conducting pipe. The second heat-conducting pipe is sleeved on the outside of the second nozzle, and a second heating wire is embedded on the outside of the second heat-conducting pipe.

7. A hot runner structure as described in claim 6, characterized in that, An insulation tube is fitted around the outside of the second heat pipe, and a groove is formed on the insulation tube, through which the second heating wire passes.

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