Method of operating the closing means of a double plate injection moulding machine
US5660783A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1995 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | Feb 16, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/6764
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In order to operate the closing means of a double plate injection moulding machine including a fixed and a movable mould plate, the closing means comprising at least one pump (22), at least one high speed cylinder for a high speed stroke and at least one closing cylinder (10) for a closing stroke with a nominal closing force, whereby the closing cylinder (10) includes a double action piston (7) in which both piston faces (13, 14) are the same size and which divides the interior of the closing cylinder (6) into two cylinder sections (8, 9) which are hydraulically connectable via hydraulic lines (21, 22) and a valve (26), the following method is carried out: during the high speed closing operation using the high speed cylinder (3), both sides of the piston (7) of the closing cylinder (10) are pressurized with an equal, high pressure which is as high as or higher than that required to obtain the required nominal closing force, whereby on moving the piston (7) of the closing cylinder (10) in the closing direction (15), the valve (26) allows the pressure between the two cylinder sections (8, 9) to be equalized, and in that the power closing operation is effected by releasing hydraulic o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.