Electrical injection velocity-pressure switching and pressure holding device
US6994537B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2003 |
| Grant date | Feb 7, 2006 |
| Priority date | — |
| Expiry date | Nov 21, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2945/76936
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A velocity-pressure switching and pressure holding device and system for electrically-operated injection molding machines. The switching between closed-loop position control and closed-loop pressure control of a servo motor of an injection molding machine is quickly and smoothly achieved by a switchable loop switch to ensure the optimal control of the velocity-pressure switching during injection filling and pressure holding. Furthermore an adjustable observation value and a speed reducing set up for the injection axle before switching are provided to allow users to perform minor adjustments on the velocity-pressure switching during the slow down of the injection axle. The present invention easily and precisely achieves the optimal velocity-pressure switching parameters to facilitate better pressure holding ability to increase the quality of the plastic products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.