Injection molding device

Patent metadata

Field	Value
Publication number	US-12076897-B2
Application number	US-202217884879-A
Country	US
Kind code	B2
Filing date	Aug 10, 2022
Priority date	Aug 12, 2021
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

An injection molding device includes a barrel, an injection screw, and an injection driving unit, wherein the injection screw includes a screw body, a screw head coupled to a front end of the screw body, and a check ring coupled to the screw head, the check ring including an accommodation groove that accommodates a portion of the screw head, a front member disposed in front of the screw head accommodated in the accommodation groove, and an accommodation member connected to the front member and surrounding a side surface of the at least a portion of the screw head accommodated in the accommodation groove, and when the injection screw moves forward to supply a molding material in the barrel to a clamping device, as the front member is pushed by the molding material accumulated on a front side of the injection screw, the check ring moves rearward from the screw head.

First claim

What is claimed is:

1. An injection molding device comprising:
a barrel;
an injection screw disposed inside the barrel; and
an injection driving unit that drives the injection screw,
wherein the injection screw includes:
a screw body connected to the injection driving unit;
a screw head coupled to a front end of the screw body; and
a check ring movably coupled to the screw head,
the check ring includes:
an accommodation groove that accommodates at least a portion of the screw head;
a front member disposed in front of the screw head accommodated in the accommodation groove; and
an accommodation member connected to the front member and surrounding a side surface of the at least a portion of the screw head accommodated in the accommodation groove,
when the injection screw moves forward to supply a molding material in the barrel to a clamping device, as the front member is pushed by the molding material accumulated on a front side of the injection screw, the check ring moves rearward from the screw head, and
the front member is disposed in front of the screw head and covers an entire front surface of the screw head.

2. The injection molding device of claim 1 , wherein:
the injection screw includes a limitation part coupled to the screw head; and
the limitation part supports the check ring to limit a distance by which the check ring moves forward from the screw head.

3. The injection molding device of claim 2 , wherein:
the check ring includes an accommodation hole for accommodating the limitation part;
the screw head includes a coupling hole to be coupled to the limitation part; and
the limitation part is accommodated in the accommodation hole in a state of being inserted into the coupling hole and couples the screw head and the check ring.

4. The injection molding device of claim 3 , wherein the accommodation hole is formed as a hole that extends in a front-rear direction so that the check ring moves in the front-rear direction with respect to the screw head.

5. The injection molding device of claim 3 , wherein the check ring includes a discharge hole connected to the accommodation groove, and
the discharge hole is formed in the accommodation member at a location spaced apart rearward from the front member.

6. The injection molding device of claim 2 , wherein:
the check ring includes an insertion hole into which the limitation part is to be inserted;
the screw head includes a coupling hole to be coupled to the limitation part; and
as the limitation part is inserted into the coupling hole and coupled to the screw head and is not accommodated in the insertion hole, the limitation part rotatably couples the screw head to the check ring.

7. The injection molding device of claim 6 , wherein:
the check ring includes a support part protruding from the accommodation member toward the accommodation groove; and
forward movement of the check ring with respect to the screw head is limited as the support part is supported by the limitation part.

8. The injection molding device of claim 1 , wherein:
the screw head includes a head body and a protrusion protruding outward from the head body;
the protrusion limits a distance by which the check ring moves rearward from the screw head; and
when the injection screw moves forward to supply the molding material in the barrel to the clamping device, the accommodation member is in close contact with the protrusion to block flow of the molding material.

9. The injection molding device of claim 1 , wherein the screw head and the screw body are formed integrally.

10. An injection molding device comprising:
a barrel;
an injection screw disposed inside the barrel; and
an injection driving unit that drives the injection screw,
wherein the injection screw includes:
a screw body connected to the injection driving unit;
a screw head coupled to a front end of the screw body; and
a check ring movably coupled to the screw head, the check ring includes:
an accommodation groove that accommodates at least a portion of the screw head;
a front member disposed in front of the screw head accommodated in the accommodation groove; and
an accommodation member connected to the front member and surrounding a side surface of the at least a portion of the screw head accommodated in the accommodation groove, and

when the injection screw moves forward to supply a molding material in the barrel to a clamping device, as the front member is pushed by the molding material accumulated on a front side of the injection screw, the check ring moves rearward from the screw head,
the injection screw includes a limitation part coupled to the screw head;
the limitation part supports the check ring to limit a distance by which the check ring moves forward from the screw head;
the check ring includes an accommodation hole for accommodating the limitation part;
the screw head includes a coupling hole to be coupled to the limitation part;
the limitation part is accommodated in the accommodation hole in a state of being inserted into the coupling hole and couples the screw head and the check ring;
the accommodation hole is formed in the accommodation member as a hole that extends in a front-rear direction so that the check ring moves in the front-rear direction with respect to the screw head;
the check ring includes a discharge hole connected to the accommodation groove,
the discharge hole is formed in the accommodation member through the accommodation member at a location spaced apart rearward from the front member so that the discharge hole has a certain spacing from the accommodation hole;
the molding material transferred forward by the screw body passes through a space between the check ring and the screw head and flows into the accommodation groove, and the molding material flowing into the accommodation groove is discharged forward from the accommodation groove through the discharge hole;
the check ring includes a stay prevention hole for discharging the molding material remaining inside the accommodation groove; and
the stay prevention hole is formed to pass through the front member and has a smaller size than an outer diameter of a front surface of the screw head.

Assignees

• Ls Mtron Ltd

Inventors

• Ahn Jeong Hun

Classifications

• B29C45/50

  Axially movable screw · CPC title

• B29C2045/522

  Spring biased check rings · 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

• B29C45/62

  Barrels or cylinders · CPC title

• B29C45/60 Primary

  Screws · CPC title