Blow mold unit, blow molding machine and method for replacing blow mold unit

Patent metadata

Field	Value
Publication number	US-10086552-B2
Application number	US-201214353759-A
Country	US
Kind code	B2
Filing date	Oct 22, 2012
Priority date	Oct 24, 2011
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

Embodiments include a blow molding machine, a method for replacing a blow mold unit, and a mold unit including a blow mold including first and second blow cavity split molds and a plurality of raised bottom molds; first and second pressure receiving plates; first and second fixing plates to which the first and second blow cavity split molds and the first and second pressure receiving plates are respectively fixed; a third fixing plate interposed between the first and second fixing plates and to which the raised bottom molds are fixed at a first surface thereof; a pressure receiving rod hanging down from a second surface and including an engaged portion engageable with the engaging portion; and a placement portion fixed to at least one of the first and second fixing plates and placing the third fixing plate thereon when the first and second blow cavity split molds are closed.

First claim

The invention claimed is:

1. A blow mold unit to be connected to first and second mold clamping plates movable such that they are symmetrical to each other by a mold clamping/mold opening device of a blow molding machine and an elevation device of the blow molding machine, the blow mold unit comprising:
a blow mold including first and second blow cavity split molds to be clamped by bringing mold parting surfaces thereof into contact with each other, and a plurality of raised bottom molds that define a plurality of raised bottom shapes for a plurality of cavities defined by the first and second blow cavity split molds;
first and second pressure receiving plates have plate parting surfaces and that receive mold clamping pressure by bringing the plate parting surfaces into contact with each other;
a first fixing plate to which the first blow cavity split mold and the first pressure receiving plate are fixed and to be connected to the first mold clamping plate;
a second fixing plate to which the second blow cavity split mold and the second pressure receiving plate are fixed and to be connected to the second mold clamping plate;
a third fixing plate interposed between the first and second fixing plates and to which the plurality of raised molds are fixed at a first surface thereof;
a pressure receiving rod extending down from a second surface of the third fixing plate opposed to the first surface; and
a placement portion fixed to at least one of the first and second fixing plates and placing the third fixing plate thereon when the first and second blow cavity split molds are closed,
wherein a first engaging portion of the pressure receiving rod is engageable in a vertical direction with a second engaging portion of an elevation rod of the elevation device, and wherein the third fixing plate is in direct contact with the placement portion and is supported on a top of the placement portion when the first and second blow cavity split molds are closed, and the third fixing plate is not in contact with the placement portion and is not supported by the placement portion when the first and second blow cavity split molds are opened.

2. The blow mold unit according to claim 1 ,
wherein a tapered surface is formed on at least one of the first engaging portion of the pressure receiving rod and the second engaging portion of the elevation rod, and the second engaging portion centers and guides the first engaging portion, and
wherein the first engaging portion of the pressure receiving rod includes a flange.

3. The blow mold unit according to claim 1 ,
wherein the placement portion includes third and fourth pressure receiving plates that receive the mold clamping pressure by bringing the parting surfaces thereof into contact with each other, the third pressure receiving plate being fixed to the first fixing plate, and the fourth pressure receiving plate being fixed to the second fixing plate.

4. The blow mold unit according to claim 1 ,
wherein the first and second pressure receiving plates each include:
a roller rollingly contacting with a base of the blow molding machine; and
a roller drive member that drives the roller lower from an elevated position where the roller does not project from a lower-most surface of the blow mold unit to a lowered position where the roller rollingly contacts with the base.

5. The blow mold unit according to claim 4 ,
wherein the first pressure receiving plate is fixed to the first fixing plate at both sides of the first blow cavity split mold,
wherein the second pressure receiving plate is fixed to the second fixing plate at both sides of the second blow cavity split mold,
wherein a first slide metal is fixed to a lower-most surface of the first pressure receiving plate and a second slide metal is fixed to a lower-most surface of the second pressure receiving plate,
wherein the first slide metal includes a first pin insertable into a first hole formed in the lower-most surface of the first pressure receiving plate and a first screw hole to which a first bolt is threadedly engaged in the first pressure receiving plate, and the second slide metal includes a second pin insertable into a second hole formed in the lower-most surface of the second pressure receiving plate and a second screw hole to which a second bolt is threadedly engaged in the second pressure receiving plate, and
wherein the first and pressure receiving plate includes a first hollow portion, a first bolt hole is formed to penetrate from an upper surface facing the first hollow portion to the lower-most surface of the first pressure receiving plate, and the first bolt is inserted into the first bolt hole from the upper side and is threadedly engaged to the first screw hole, and the second pressure receiving plate includes a second hollow portion, a second bolt hole is formed to penetrate from an upper surface facing the second hollow portion to the lower-most surface of the second pressure receiving plate, and the second bolt is inserted into the second bolt hole from the upper side and is threadedly engaged to the second screw hole.

6. A blow molding machine comprising:
a base;
a blow mold unit is supported on the base, the blow mold unit including
a blow mold including first and second blow cavity split molds to be clamped by bringing mold parting surfaces thereof into contact with each other, and a plurality of raised bottom molds that define a plurality of raised bottom shapes for a plurality of cavities defined by the first and second blow cavity split molds,
first and second pressure receiving plates that receive mold clamping pressure by bringing plate parting surfaces thereof into contact with each other,
a first fixing plate to which the first blow cavity split mold and the first pressure receiving plate are fixed and to be connected to a first mold clamping plate,
a second fixing plate to which the second blow cavity split mold and the second pressure receiving plate are fixed and to be connected to a second mold clamping plate,
a third fixing plate interposed between the first and second fixing plates and to which the plurality of raised molds are fixed at a first surface thereof,
a pressure receiving rod extending down from a second surface of the third fixing plate opposed to the first surface, and
a placement portion fixed to at least one of the first and second fixing plates and placing the third fixing plate thereon when the first and second blow cavity split molds are closed,
wherein a first engaging portion of the pressure receiving rod is engageable in a vertical direction with a second engaging portion of an elevation rod of an elevation device;

a mold clamping/mold opening device provided on the base and drives the first and second fixing plates of the blow mold unit to clamp/open the first and second blow cavity split molds; and
the elevation device that drives the elevation rod to lift and lower the plurality of raised bottom molds of the blow mold unit, and
wherein the third fixing plate is in direct contact with the placement portion and is supported on a top of the placement portion when the first and second blow cavity split molds are closed, and the third fixing plate is not in contact with the placement portion and is not supported by the placement portion when the first and second blow cavity split molds are opened.

7. The blow mold unit according to claim 1 ,
wherein the placement portion is located nearer to a center of the blow mold unit, in a longitudinal direction of the blow mold unit, than both ends of the third fixing plate in the longitudinal direction.

8. The blow mold unit according to claim 2 , wherein the flange contacts a top of the second engaging portion to provide a lower limit of the pressure

Assignees

• Nissei Asb Machine Co Ltd

Inventors

• Takahashi Junji

Classifications

• B29C49/06

  Injection blow-moulding · CPC title

• B29C2049/4858

  Exchanging mould parts, e.g. for changing the mould size or geometry for making different products in the same mould · CPC title

• B29C49/56

  Opening, closing or clamping means · CPC title

• B29C2049/4869

  Operations & Transport · mapped topic

• B29C49/28 Primary

  Blow-moulding apparatus · CPC title