Injection device

Patent metadata

Field	Value
Publication number	US-2021308921-A1
Application number	US-201917266767-A
Country	US
Kind code	A1
Filing date	Mar 28, 2019
Priority date	Aug 29, 2018
Publication date	Oct 7, 2021
Grant date	—

Abstract

An injection device includes a heating cylinder (27), a screw (29) placed in the heating cylinder (27) so as to be rotatable and movable in an axial direction, an injection stage (50) supporting the heating cylinder (27), and a material introducing member (40) unit that supplies a resin material to the heating cylinder (27). The material introducing member (40) includes a first heat medium passage through which a heat medium having undergone a temperature control passes, and is fitted in a vertical hole (57) formed in the injection stage (50) from an upper side. The material introducing member (40) includes a cylindrical portion (42) that extends along the vertical hole (57). A heat insulating air layer (68) with a predetermined thickness is ensured between an outer circumference of the cylindrical portion (42) and a surface of the vertical hole (57). A lower part of the cylindrical portion (42) is in contact with the heating cylinder (27).

First claim

1 . An injection device comprising:
a heating cylinder; a screw placed in the heating cylinder so as to be rotatable and movable in an axial direction; an injection stage supporting the heating cylinder; a material supplying unit that supplies a resin material to the heating cylinder; and a material introducing member which is placed between the material supplying unit and which introduces the resin material from the material supplying unit to the heating cylinder, wherein the material introducing member comprises a first heat medium passage through which a heat medium having undergone a temperature control passes, and is fitted in a vertical hole formed in the injection stage from an upper side, wherein the material introducing member comprises a cylindrical portion that extends along the vertical hole, and wherein a heat insulating air layer with a predetermined thickness is ensured between an outer circumference of the cylindrical portion and a surface of the vertical hole, and a lower part of the cylindrical portion is in contact with the heating cylinder.

2 . The injection device according to claim 1 , wherein:
the injection stage is a cast component; the material introducing member is a cutting-and-machining component formed by cutting and machining from a metal block; and a recess that ensures the heat insulating air layer is formed in the cutting-and-machining component.

3 . The injection device according to claim 1 , wherein the injection stage comprises a second heat medium passage through which the heat medium having undergone the temperature control passes.

4 . The injection device according to claim 1 , wherein:
the injection stage is formed in a box shape that has a front wall portion and a rear wall portion; a tail portion of the heating cylinder is supported by the front wall portion and by the rear wall portion; and in a space between the front wall portion and the rear wall portion, a temperature detector, a heater and a cooling jacket are attached to the tail portion of the heating cylinder.

5 . The injection device according to claim 4 , wherein:
the tail portion of the heating cylinder is supported by the rear wall portion through a component that has a lower heat transfer rate than a heat transfer rate of the injection stage; the tail portion of the heating cylinder is fastened to the front wall portion by a bolt through a ring member provided with a bolt hole; and a heat insulating member is held between the ring member and the front wall portion.

6 . The injection device according to claim 5 , wherein:
the cylindrical portion comprises a flange portion at an upper part; and a gasket that has a lower heat transfer rate than a heat transfer rate of the injection stage is held between the flange portion and the injection stage.

7 . The injection device according to claim 4 , wherein the cylindrical portion comprises a flange portion at an upper part; and
a gasket that has a lower heat transfer rate than a heat transfer rate of the injection stage is held between the flange portion and the injection stage.

8 . The injection device according to claim 3 , wherein:
the cylindrical portion comprises a flange portion at an upper part; and a gasket chat has a lower heat transfer rate than a heat transfer rate of the injection stage is held between the flange portion and the injection stage.

9 . The injection device according to claim 2 , wherein:
the cylindrical portion comprises a flange portion at an upper part; and a gasket that has a lower heat transfer rate than a heat transfer rate of the injection stage is held between the flange portion and the injection stage.

10 . The injection device according to claim 1 , wherein:
the cylindrical portion comprises a flange portion at an upper part; and a gasket that has a lower heat transfer rate than a heat transfer rate of the injection stage is held between the flange portion and the injection stage.

Assignees

• Nissei Plastics Ind Co

Inventors

• Sakurada Yuichi
• Naito Nanae
• Arai Keita
• Yoda Hozumi
• Murata Hirofumi

Classifications

• B29C45/74 Primary

  of the injection unit · CPC title

• B29C45/18

  Feeding the material into the injection moulding apparatus {, i.e. feeding the non-plastified material into the injection unit} · CPC title

• B29C2045/1875

  Hoppers connected to a feed screw · CPC title

• B29C45/50 Primary

  Axially movable screw · CPC title

• B29C45/62

  Barrels or cylinders · CPC title