Injection molding machine

Patent metadata

Field	Value
Publication number	US-12472671-B2
Application number	US-202318389546-A
Country	US
Kind code	B2
Filing date	Nov 14, 2023
Priority date	Dec 12, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A cylinder that kneads an injection material, a heat insulating cover that covers a side surface of the cylinder, the heat insulating cover including a first end portion and a second end portion, a heater arranged between the heat insulating cover and the cylinder, the heater heating a first region of the cylinder, and a first heat pipe that thermally connects the first region and a second region to each other, the second region being different from the first region, are provided. The heat insulating cover includes the first end portion and the second end portion through which the injection material passes, and the first region is closer to a midpoint between the first end portion and the second end portion than the second region.

First claim

What is claimed is:

1 . An injection molding machine comprising:
a cylinder that kneads an injection material supplied from outside and supplies the kneaded injection material to the outside; a heat insulating cover that covers a side surface of the cylinder, the heat insulating cover including a first end portion and a second end portion; a heater arranged between the heat insulating cover and the cylinder, the heater heating a first region of the cylinder; and a first heat pipe that thermally connects the first region and a second region of the cylinder to each other, the second region being different from the first region, wherein the first region is closer to a midpoint between the first end portion and the second end portion than the second region.

2 . The injection molding machine according to claim 1 , further comprising a cooling apparatus that cools the injection material supplied to the cylinder, wherein
the second region is closer to the cooling apparatus than the first region.

3 . The injection molding machine according to claim 1 , further comprising a nozzle that injects the kneaded injection material into a mold, wherein
the second region is closer to the nozzle than the first region.

4 . The injection molding machine according to claim 2 , further comprising:
a nozzle that injects the kneaded injection material into a mold; and a second heat pipe that thermally connects a third region in inside of the heat insulating cover and the first region to each other, wherein the third region is closer to the nozzle than the first region, and the first region is closer to the midpoint than the third region.

5 . The injection molding machine according to claim 1 , further comprising:
a first temperature sensor that detects a temperature of the first region; a second temperature sensor that detects a temperature of the second region; and a controller connected to the first temperature sensor and the second temperature sensor, wherein the controller is configured to
obtain the temperature detected by the first temperature sensor,
obtain the temperature detected by the second temperature sensor, and
perform processing for cutting off thermal connection between the first region and the second region by the first heat pipe when the temperature detected by the first temperature sensor is lower than a first reference value or when the temperature detected by the second temperature sensor is higher than a second reference value, and
the first reference value represents a temperature higher than the second reference value.

6 . The injection molding machine according to claim 4 , further comprising:
a first temperature sensor that detects a temperature of the first region; a second temperature sensor that detects a temperature of the second region; a third temperature sensor that detects a temperature of the third region; and a controller connected to the first temperature sensor, the second temperature sensor, and the third temperature sensor, wherein the controller is configured to
obtain the temperature detected by the first temperature sensor,
obtain the temperature detected by the second temperature sensor,
obtain the temperature detected by the third temperature sensor,
perform processing for cutting off thermal connection between the first region and the second region by the first heat pipe and cutting off thermal connection between the first region and the third region by the second heat pipe when the temperature detected by the first temperature sensor is lower than a first reference value,
perform processing for cutting off thermal connection between the first region and the second region by the first heat pipe when the temperature detected by the second temperature sensor is higher than a second reference value, and
perform processing for cutting off thermal connection between the first region and the third region by the second heat pipe when the temperature detected by the third temperature sensor is higher than a third reference value, and
the first reference value represents a temperature higher than the second reference value and the third reference value.

7 . The injection molding machine according to claim 2 , further comprising a controller that obtains power consumption by the cooling apparatus and adjusts output of the cooling apparatus, wherein
the controller is configured to perform processing for cutting off thermal connection between the first region and the second region by the first heat pipe when power consumption by the cooling apparatus is higher than a predetermined threshold value.

8 . The injection molding machine according to claim 5 , wherein
the processing for cutting off thermal connection is processing for giving a notification that the first heat pipe is to be disconnected.

9 . The injection molding machine according to claim 5 , further comprising an actuator that changes arrangement of the first heat pipe, wherein
the processing for cutting off thermal connection is processing for cutting off thermal connection between the first region and the second region by change in arrangement of the first heat pipe by the actuator.

10 . The injection molding machine according to claim 1 , further comprising:
a first heat radiation body arranged closer to the first region than the second region; and a second heat radiation body arranged closer to the second region than the first region, wherein the first heat pipe is
thermally connected to the first region with the first heat radiation body being interposed, and
thermally connected to the second region with the second heat radiation body being interposed.

11 . The injection molding machine according to claim 1 , further comprising a third heat pipe that thermally connects the first region and the second region to each other.

Assignees

• Japan Steel Works Ltd

Inventors

• Takamatsu Syunsuke

Classifications

• B29C2945/7604

  Temperature · CPC title

• B29C2945/76531

  Temperature · CPC title

• B29C2945/76193

  barrel-chamber · CPC title

• B29C2945/76672

  barrel-chamber · CPC title

• B29C45/74

  of the injection unit · CPC title