CN-121973401-A - Hot runner device, injection molding equipment and injection molding method

CN121973401ACN 121973401 ACN121973401 ACN 121973401ACN-121973401-A

Abstract

The invention discloses a hot runner device, injection molding equipment and an injection molding method, and relates to the technical field of injection molding equipment, wherein the hot runner device comprises a runner component and a temperature control device, the runner component is provided with a hot runner, the runner component comprises a hot nozzle main body, a hot nozzle head and a heating wire, the hot nozzle head is detachably arranged on the hot nozzle main body and jointly defines at least part of the hot runner, the hot nozzle main body is provided with an inlet communicated with the hot runner, the hot nozzle head is provided with an outlet communicated with the hot runner, the heating wire is arranged on the hot nozzle head, the temperature control device is electrically connected with the heating wire, the temperature control device is configured to control the heating wire to work so as to heat and maintain the hot nozzle head at a preset temperature when the injection molding equipment is in a mold closing stage, a glue injecting stage and a pressure maintaining stage, and control the heating wire to stop heating or reduce heating power of the heating wire when the injection molding equipment is in a mold cooling and opening stage, so as to avoid the problems of uneven gate pulling, nozzle blocking, a casting wire and a wire and the like caused by a traditional hot runner structure adopting a constant temperature control mode.

Inventors

WANG JINGWEN
Huo qin

Assignees

安米工业(深圳)有限公司

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (16)

1. A hot runner apparatus for use in an injection molding apparatus, comprising: The runner assembly is provided with a hot runner, the runner assembly comprises a hot nozzle main body, a hot nozzle head and a heating wire, the hot nozzle head is detachably arranged on the hot nozzle main body and jointly defines at least part of the hot runner, the hot nozzle main body is provided with an inlet communicated with the hot runner, the hot nozzle head is provided with an outlet communicated with the hot runner, and the heating wire is arranged on the hot nozzle head; a temperature control device electrically connected with the heating wire, the temperature control device configured to: When the injection molding equipment is in the mold closing, glue injection and pressure maintaining stages, the heating wire is controlled to work so as to heat and maintain the hot nozzle head at a preset temperature; and when the injection molding equipment is in a cooling and mold opening stage, controlling the heating wire to stop heating or reducing the heating power of the heating wire to a preset value.
2. The hot runner apparatus as described in claim 1 wherein said heater wire is wrapped around the peripheral wall of said hot nozzle head and is disposed in a plurality of turns, said plurality of turns being disposed around said hot runner and adjacent said outlet.
3. The hot runner apparatus as described in claim 2 wherein a limit groove is provided in the peripheral wall of the hot nozzle head, and a plurality of turns of the heating wire are provided in the limit groove.
4. The hot runner device of claim 3, wherein the limit groove is annularly arranged around the axis direction of the hot nozzle head, and a plurality of circles of the heating wires are sequentially arranged in the limit groove along the axis direction of the hot nozzle head; Or the limiting groove is arranged on the peripheral wall of the hot nozzle continuously and at least partially along the axial direction of the hot nozzle in a double-spiral mode, the heating wire is arranged along the limiting groove, and two free ends of the heating wire extend towards the direction of the hot nozzle main body.
5. The hot runner apparatus as described in claim 3 wherein the limiting groove has a depth value H, the H value satisfying 1.5 mm≤H≤2 mm; and/or the limit groove is continuously arranged on the peripheral wall of the hot nozzle head and at least partially spirally arranged along the axial direction of the hot nozzle head, the width value of the limit groove is D, and the D value is more than or equal to 1.5mm and less than or equal to 1.8mm; And/or one end of the hot nozzle head far away from the hot nozzle main body is provided with an end face, the distance value between the groove wall of the limiting groove close to the end face and the end face is M, and the M value is more than or equal to 1mm and less than or equal to 5mm; And/or the diameter of one end of the hot nozzle head far away from the hot nozzle main body is N, and the N value is more than or equal to 13mm and less than or equal to 35mm.
6. The hot runner apparatus as described in claim 3 wherein a first insulating layer is provided on an outer surface of the heating wire, and a second insulating layer is provided between the first insulating layer and a wall of the limit groove; And/or, the runner assembly further comprises a temperature measuring element, the temperature measuring element is arranged in the limit groove and is electrically connected with the temperature control device, and the temperature control device detects the temperature value of the hot nozzle head through the temperature measuring element; And/or, the runner assembly further comprises a heat insulation ring and a lantern ring, the heat insulation ring is arranged on the hot nozzle head, the inner wall of the heat insulation ring is opposite to the heating wires, and the lantern ring is sleeved on the hot nozzle head and is positioned on the outer side of the heat insulation ring.
7. The hot runner apparatus as described in claim 2 wherein said heater wire is wrapped around said hot nozzle tip with a number of turns a, said a satisfying 2≤a≤8.
8. The hot runner apparatus as described in claim 1 wherein one of said hot nozzle tip and said hot nozzle body is provided with external threads and the other is provided with internal threads matching said external threads, said hot nozzle tip being removably connected to said hot nozzle body by said external threads, internal threads; And/or the outlet of the hot nozzle head is a sharp outlet, a large water gap straight-through outlet or a needle valve outlet.
9. The hot runner apparatus as claimed in any one of claims 1 to 8 further comprising a runner plate connected to the hot runner body, at least part of the hot runner being provided on the runner plate, the hot runner body being provided with a first heating element and the runner plate being provided with a second heating element, the temperature control apparatus being electrically connected to the first and second heating elements.
10. The hot runner apparatus as described in claim 9 wherein the temperature control device comprises a first temperature control unit and a second temperature control unit, the first temperature control unit being electrically connected to the heater strip and the second temperature control unit being electrically connected to the first heating element and the second heating element.
11. The hot runner apparatus as described in claim 9 wherein said runner assembly includes a plurality of said hot nozzle bodies, each of said hot nozzle bodies having said hot nozzle head thereon, said hot runner on said runner plate having a plurality of sub-runners, said plurality of said hot nozzle bodies being disposed on said runner plate and in one-to-one communication with each of said plurality of sub-runners.
12. Injection molding apparatus comprising a hot runner device according to any one of claims 1 to 11.
13. The injection molding apparatus of claim 12, further comprising an injection mold and an injection molding machine, the runner assembly being disposed in the injection mold, the injection mold having a gate and a cavity, the injection molding machine being configured to inject melt into the cavity through the runner assembly, the gate.
14. The injection molding apparatus of claim 13, wherein the injection mold comprises a movable mold and a fixed mold, cooling water channels are respectively arranged on the movable mold and the fixed mold, the fixed mold is provided with the pouring gate and a water transporting sleeve arranged at the pouring gate, the movable mold is provided with the cavity, the runner component is arranged on the fixed mold and at least part of the hot nozzle head is arranged in the water transporting sleeve, and the cooling water channels and the water transporting sleeve are used for transporting cooling water to cool the pouring gate and the cavity.
15. An injection molding method, characterized in that the injection molding method is applied to the injection molding device according to any one of claims 12 to 14, the injection molding device comprises a hot runner device and an injection mold, the hot runner device comprises a runner plate, a hot nozzle main body and a hot nozzle head which are sequentially connected and form a hot runner, a first heating piece is arranged on the runner plate, a second heating piece is arranged on the hot nozzle main body, a heating wire is arranged on the hot nozzle head, the injection mold is provided with a pouring gate, a cavity and a cooling water channel, and the injection molding method comprises the following steps: controlling a heating wire to heat the hot nozzle head to a first preset temperature; controlling the first heating element to heat the hot nozzle main body to a second preset temperature, and controlling the second heating element to heat the runner plate to a third preset temperature; Injecting melt into the hot runner, controlling the first heating element and the second heating element to maintain the melt injected into the hot runner in a molten state, and controlling the heating wire to maintain the temperature of the hot nozzle head in a preset temperature range; And after filling the melt into the cavity and maintaining the pressure, controlling the heating wire to stop heating or reducing the heating power of the heating wire, and injecting cooling water into the cooling water channel so as to cool and solidify the melt at the gate and in the cavity.
16. The injection molding method of claim 15, wherein said thermal nozzle further comprises a temperature measuring element electrically connected to said temperature control device, said injection molding method further comprising the steps of: And acquiring the temperature of the hot nozzle, and controlling a heating wire on the hot nozzle to stop heating so as to solidify melt in the hot nozzle when the current temperature of the hot nozzle exceeds a preset temperature interval or the temperature measuring element detects faults.

Description

Hot runner device, injection molding equipment and injection molding method Technical Field The invention relates to the technical field of injection molding equipment, in particular to a hot runner device, injection molding equipment and an injection molding method. Background In the related art, an injection molding device generally comprises an injection mold and an injection molding machine, wherein a hot runner system in the injection mold generally comprises a runner plate, a hot nozzle main body and a hot nozzle head, a heating pipe is sleeved outside the hot nozzle main body, and when injection molding is performed, the heating pipe is controlled to work so as to conduct heat to the hot nozzle main body, and then the hot nozzle main body is used for conducting heat to the hot nozzle head so as to achieve the flow temperature required by molten plastics in the injection molding process. But the accuracy of temperature control of the hot nozzle head in the structure is poor, so that the probability of uneven pulling, nozzle blocking, casting and wire drawing of a product pouring gate is high, the consistency of products in the die is difficult to balance, the quality and the production stability of the products are affected, and casting and wire drawing can even crush the die. Disclosure of Invention The invention mainly aims to provide a hot runner device, injection molding equipment and an injection molding method, and aims to solve the problem that the temperature control precision of the existing hot nozzle head is poor. In order to achieve the above object, a hot runner apparatus according to the present invention is applied to an injection molding apparatus, and includes: The runner assembly is provided with a hot runner, the runner assembly comprises a hot nozzle main body, a hot nozzle head and a heating wire, the hot nozzle head is detachably arranged on the hot nozzle main body and jointly defines at least part of the hot runner, the hot nozzle main body is provided with an inlet communicated with the hot runner, the hot nozzle head is provided with an outlet communicated with the hot runner, and the heating wire is arranged on the hot nozzle head; a temperature control device electrically connected with the heating wire, the temperature control device configured to: When the injection molding equipment is in the mold closing, glue injection and pressure maintaining stages, the heating wire is controlled to work so as to heat and maintain the hot nozzle head at a preset temperature; and when the injection molding equipment is in a cooling and mold opening stage, controlling the heating wire to stop heating or reducing the heating power of the heating wire to a preset value. In an embodiment, the heating wire is wound on the peripheral wall of the hot nozzle head and is arranged in a plurality of circles, and the heating wire is wound around the hot runner and is arranged close to the outlet. In an embodiment, a limiting groove is formed in the peripheral wall of the hot nozzle, and a plurality of circles of heating wires are arranged in the limiting groove. In an embodiment, the limiting groove is annularly arranged around the axis direction of the hot nozzle head, and the plurality of circles of heating wires are sequentially arranged in the limiting groove along the axis direction of the hot nozzle head; Or the limiting groove is arranged on the peripheral wall of the hot nozzle continuously and at least partially along the axial direction of the hot nozzle in a double-spiral mode, the heating wire is arranged along the limiting groove, and two free ends of the heating wire extend towards the direction of the hot nozzle main body. In one embodiment, the depth value of the limiting groove is H, and the H value is 1.5 mm-2 mm; and/or the limit groove is continuously arranged on the peripheral wall of the hot nozzle head and at least partially spirally arranged along the axial direction of the hot nozzle head, the width value of the limit groove is D, and the D value is more than or equal to 1.5mm and less than or equal to 1.8mm; And/or one end of the hot nozzle head far away from the hot nozzle main body is provided with an end face, the distance value between the groove wall of the limiting groove close to the end face and the end face is M, and the M value is more than or equal to 1mm and less than or equal to 5mm; And/or the diameter of one end of the hot nozzle head far away from the hot nozzle main body is N, and the N value is more than or equal to 13mm and less than or equal to 35mm. In an embodiment, a first insulating layer is arranged on the outer surface of the heating wire, and a second insulating layer is arranged between the first insulating layer and the wall of the limiting groove; And/or, the runner assembly further comprises a temperature measuring element, the temperature measuring element is arranged in the limit groove and is electrically connected with the temperature c