GB843328A - Improvements in and relating to control devices for hydraulic rams - Google Patents
Improvements in and relating to control devices for hydraulic ramsInfo
- Publication number
- GB843328A GB843328A GB24880/58A GB2488058A GB843328A GB 843328 A GB843328 A GB 843328A GB 24880/58 A GB24880/58 A GB 24880/58A GB 2488058 A GB2488058 A GB 2488058A GB 843328 A GB843328 A GB 843328A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- ram
- liquid
- actuates
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/67—Mould opening, closing or clamping devices hydraulic
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
843,328. Hydraulic presses. NATIONAL AUTOMATIC TOOL CO. Inc. Aug. 1, 1958 [Aug. 26, 1957], No. 24880/58. Class 69 (2). A ram 12 of a moulding machine is advanced rapidly by supplying liquid from a pump 42 through a valve 56 to a booster cylinder 15 formed in the ram. A pilot pump 44 supplies liquid through a valve 58 to a valve chamber 23 to unseat a valve 26 from a seat 28 so that liquid from a reservoir 46 supplies oil to the ram cylinder at the rear of the ram. Towards the end of the advance stroke a dog 72 on the ram actuates a switch LS-2 which actuates valve 58 so that valve chamber 23 is opened to exhaust and the valve 26 seated by a spring 30. The valve stem 24 uncovers ports 32 so that pump 42 in addition to supplying the booster cylinder supplies to the main ram cylinder 10, to give a slower speed. This prevents harmful impacts between the moulds and gives full clamping force. When dog 72 actuates a switch LS-3, valve 58 is actuated and valve 56 reversed so that liquid is supplied to a pull-back area 34 of the ram which is retracted rapidly. At the end of the return stroke a switch LS-1 is opened to stop the operation.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US843328XA | 1957-08-26 | 1957-08-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB843328A true GB843328A (en) | 1960-08-04 |
Family
ID=22184285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB24880/58A Expired GB843328A (en) | 1957-08-26 | 1958-08-01 | Improvements in and relating to control devices for hydraulic rams |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB843328A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2129879A1 (en) * | 1971-03-18 | 1972-11-03 | Viron Michel | |
WO2000074921A1 (en) * | 1999-06-04 | 2000-12-14 | Sipa S.P.A. | Hydraulic press apparatus with improved control of the oleo-dynamic circuit thereof |
-
1958
- 1958-08-01 GB GB24880/58A patent/GB843328A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2129879A1 (en) * | 1971-03-18 | 1972-11-03 | Viron Michel | |
WO2000074921A1 (en) * | 1999-06-04 | 2000-12-14 | Sipa S.P.A. | Hydraulic press apparatus with improved control of the oleo-dynamic circuit thereof |
US6709260B1 (en) | 1999-06-04 | 2004-03-23 | Sipa S.P.A. | Hydraulic press apparatus with improved control of the oleo-dynamic circuit thereof |
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