GB1287742A - Improvements in or relating to hydraulic ram control means - Google Patents
Improvements in or relating to hydraulic ram control meansInfo
- Publication number
- GB1287742A GB1287742A GB2714768A GB2714768A GB1287742A GB 1287742 A GB1287742 A GB 1287742A GB 2714768 A GB2714768 A GB 2714768A GB 2714768 A GB2714768 A GB 2714768A GB 1287742 A GB1287742 A GB 1287742A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- cylinder
- ram
- slide
- reaction force
- 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
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
- F15B9/12—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which both the controlling element and the servomotor control the same member influencing a fluid passage and are connected to that member by means of a differential gearing
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
1287742 Slides IAN NICHOLS Ltd 26 Aug 1969 [7 June 1968] 27147/68 Heading B3B [Also in Division F1] A double acting hydraulic ram 1 for moving a cross slide 7 is secured to a fixed frame 9 and is supplied by a pump 9 delivering through reversible distributing valve 8 of the closed centre spool type and which is biased to an open position by a double acting compressed air motor 16 linked thereto by levers 10, 11 and the control valve 8 is subjected to a controlled opposing bias provided by the reaction force of a cylinder 21 mechanically connected to lever 10 when fluid is displaced therefrom through a needle valve 24 by means of a piston 22 connected by its rod 20 to the slide 7 and whereby a preselected ram speed is achieved by balancing the two biases. In operation compressed air is supplied through a pressure control valve 18 and reversing valve 19 to say the left hand side of motor 16 which thus moves control lever 11 anti-clockwise and displaces valve 8 and the connected cylinder 21 to the right thereby feeding hydraulic fluid to the right hand end of a cylinder 4 so as to extend slide 7 and connected piston 22. The reaction force provided by the back pressure set up by the partly open needle valve 24 and acting against the left hand end of cylinder 2 serves to partly close valve 8 to a position where the reaction force and the ram moves at a constant speed depending on the setting of valves 18, 24. If during the forward stroke the slide offers an increased resistance so that the ram speed falls, the reaction bias automatically decreases and the control valve 8 assumes a more open position resulting in the ram speed being restored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2714768A GB1287742A (en) | 1968-06-07 | 1968-06-07 | Improvements in or relating to hydraulic ram control means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2714768A GB1287742A (en) | 1968-06-07 | 1968-06-07 | Improvements in or relating to hydraulic ram control means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1287742A true GB1287742A (en) | 1972-09-06 |
Family
ID=10254980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2714768A Expired GB1287742A (en) | 1968-06-07 | 1968-06-07 | Improvements in or relating to hydraulic ram control means |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1287742A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242635A (en) * | 2019-07-19 | 2019-09-17 | 湖北万测试验设备有限公司 | A kind of oil cylinder minute movement control system |
-
1968
- 1968-06-07 GB GB2714768A patent/GB1287742A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242635A (en) * | 2019-07-19 | 2019-09-17 | 湖北万测试验设备有限公司 | A kind of oil cylinder minute movement control system |
| CN110242635B (en) * | 2019-07-19 | 2024-05-24 | 湖北万测试验设备有限公司 | Micro-movement control system for oil cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |