Injection device and injection molding machine

Patent metadata

Field	Value
Publication number	US-11845211-B2
Application number	US-202217831876-A
Country	US
Kind code	B2
Filing date	Jun 3, 2022
Priority date	Jun 14, 2021
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

An injection device includes: a heating cylinder; a screw disposed in the heating cylinder; and a pair of piston cylinder components disposed on two sides of the heating cylinder. The pair of piston cylinder components are installed so that one end portion of each of the pair of piston cylinder components is connected to a mold clamping device, and the heating cylinder and the screw are integrally driven in a direction close to or away from the mold clamping device by expansion and contraction of the pair of piston cylinder components. One of the pair of piston cylinder components is provided with a stop mechanism configured to stop expansion and contraction of the piston cylinder component.

First claim

What is claimed is:

1. An injection device comprising:
a heating cylinder;
a screw disposed in the heating cylinder;
a pair of piston cylinder components disposed on two sides of the heating cylinder, and
a direction switching valve configured to switch a direction of hydraulic fluid toward and away from both of the pair of piston cylinder components,
wherein the pair of piston cylinder components are installed so that a first end portion of each of the pair of piston cylinder components is connected to a mold clamping device, and the heating cylinder and the screw are integrally driven in a direction close to or away from the mold clamping device by expansion and contraction of the pair of piston cylinder components, and
wherein one of the pair of piston cylinder components is provided with a stop mechanism configured to prevent expansion and contraction of the one of the pair of piston cylinder components.

2. The injection device according to claim 1 , wherein the stop mechanism comprises a valve provided in a hydraulic circuit of the one of the pair of piston cylinder components having the stop mechanism.

3. The injection device according to claim 2 , wherein the valve comprises a stop valve.

4. The injection device according to claim 1 , wherein the pair of piston cylinder components are installed so that
a second end portion, which is the other end portion, of each of the pair of piston cylinder components is connected to a member of a screw drive device that drives the screw, and
the screw drive device is driven integrally with the heating cylinder and the screw in the direction close to or away from the mold clamping device by expansion and contraction of the pair of piston cylinder components.

5. An injection molding machine comprising:
a mold clamping device configured to clamp a mold; and
an injection device configured to inject an injection material into the mold, the injection device comprising:
a heating cylinder;
a screw provided in the heating cylinder;
a pair of piston cylinder components disposed on two sides of the heating cylinder, and
a direction switching valve configured to switch a direction of hydraulic fluid toward and away from both of the pair of piston cylinder components,

wherein the pair of piston cylinder components are installed so that a first end portion of each of the pair of piston cylinder components is connected to the mold clamping device, and the heating cylinder and the screw are integrally driven in a mold clamping device direction or in a direction opposite to the mold clamping device direction by expansion and contraction of the pair of piston cylinder components, and
wherein one of the pair of piston cylinder components is provided with a stop mechanism configured to prevent expansion and contraction of the one of the pair of piston cylinder components.

6. The injection molding machine according to claim 5 , in which the injection molding machine comprises the mold clamping device and two injection devices,
wherein the two injection devices are disposed symmetrically with respect to a machine center line of the mold clamping device, and
wherein the one of the pair of piston cylinder components provided with the stop mechanism in the two injection devices is a piston cylinder component close to the machine center line.

7. The injection molding machine according to claim 5 , wherein the stop mechanism comprises a valve provided in a hydraulic circuit of the one of the pair of piston cylinder components having the stop mechanism.

8. The injection molding machine according to claim 7 , wherein the valve comprises a stop valve.

9. The injection molding machine according to claim 5 , wherein the pair of piston cylinder components are installed so that
a second end portion, which is the other end portion, of each of the pair of piston cylinder components is connected to a member of a screw drive device that drives the screw, and
the screw drive device is driven integrally with the heating cylinder and the screw in the direction close to or away from the mold clamping device by expansion and contraction of the pair of piston cylinder components.

10. The injection device according to claim 1 , wherein only the one of the pair of piston cylinder components is provided with the stop mechanism.

11. The injection device according to claim 1 , wherein the stop mechanism is further configured to allow or stop supply of the hydraulic fluid to the one of the pair of piston cylinder components.

12. The injection device according to claim 11 ,
wherein the direction switching valve is disposed between the pair of piston cylinder components and a hydraulic source, and
wherein the stop mechanism is disposed between the one of the pair of piston cylinder components and the direction switching valve.

13. The injection molding machine according to claim 5 , wherein only the one of the pair of piston cylinder components is provided with the stop mechanism.

14. The injection molding machine according to claim 5 , wherein the stop mechanism is further configured to allow or stop supply of the hydraulic fluid to the one of the pair of piston cylinder components.

15. The injection molding machine according to claim 14 ,
wherein the direction switching valve is disposed between the pair of piston cylinder components and a hydraulic source, and
wherein the stop mechanism is disposed between the one of the pair of piston cylinder components and the direction switching valve.

Assignees

• Japan Steel Works Ltd

Inventors

• Nakagawa Yutaka
• Yonehara Yusuke
• Toyoshima Toshio

Classifications

• B29C45/6707 Primary

  without relative movement between the piston and the cylinder of the clamping device during the mould opening or closing movement · CPC title

• B29C45/74

  of the injection unit · CPC title

• B29C45/67 Primary

  hydraulic · CPC title

• B29C45/82

  Hydraulic {or pneumatic} circuits · CPC title

• B29C45/17

  Component parts, details or accessories; Auxiliary operations · CPC title