GB1455192A - Control of hydraulic or pneumatic rams - Google Patents
Control of hydraulic or pneumatic ramsInfo
- Publication number
- GB1455192A GB1455192A GB50474A GB50474A GB1455192A GB 1455192 A GB1455192 A GB 1455192A GB 50474 A GB50474 A GB 50474A GB 50474 A GB50474 A GB 50474A GB 1455192 A GB1455192 A GB 1455192A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rams
- synchronized
- amplifier
- control
- positions
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
- B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Position Or Direction (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
1455192 Automatic control of relative position PICOT SA 4 Jan 1974 [11 Jan 1973] 00504/74 Heading G3R A system for synchronizing the operation of a plurality of hydraulic or pneumatic rams comprises a servovalve A-D for each ram and an amplifier for each valve to which is supplied a control signal and a signal representative of any undesired difference in the positions of two of the rams. As shown, the positions are detected by potentiometers 4 and. the rams are synchronized in pairs. Thus, the outputs of 4a and 4b (which are of opposite sign) are combined at 5 and the combination compared with a reference voltage from 23 at 6. The reference may be zero or of a value corresponding to a desired offset in the relative positions of A and B. The output of 6 is combined with the control (command) signal for A fed via 10a for amplifier 3a and with the control signal for B fed via 10b for amplifier 3b. The arrangement is such that the valve of the leading ram (in either direction) is partially closed to effect synchronization. Rams C and D are similar synchronized with each other, and in addition B is synchronized with C, the comparator amplifier 18 for this having twice the gain of the others so as not to be over-ridden by their outputs. In an alternative embodiment Figs. 2, 3 (not shown) any number of rams may be synchronized by comparing them in pairs, either in a closed ring or an open chain. In this case the position detectors comprise resistor bridge networks connected across the comparator amplifiers, desired offset being applied by an adjustable resistor in each bridge. The rams may be used in a metal bending machine.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7301503A FR2214053B1 (en) | 1973-01-11 | 1973-01-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1455192A true GB1455192A (en) | 1976-11-10 |
Family
ID=9113400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB50474A Expired GB1455192A (en) | 1973-01-11 | 1974-01-04 | Control of hydraulic or pneumatic rams |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2400299A1 (en) |
| FR (1) | FR2214053B1 (en) |
| GB (1) | GB1455192A (en) |
| IT (1) | IT1000686B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2093399B (en) * | 1981-02-24 | 1985-07-10 | Mts System Corp | Hydraulic press |
| EP0103727A1 (en) * | 1982-09-02 | 1984-03-28 | Inventio Ag | Synchronization control apparatus for the electro-hydraulic drive of a press brake |
| DE3811666A1 (en) * | 1988-04-07 | 1989-10-19 | Gutehoffnungshuette Man | TRANSPORT VEHICLE WITH LIFTING DEVICE WITH TWO SYNCHRONIZABLE SWIVELING ARMS |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1524749A (en) * | 1967-05-29 | 1968-05-10 | British Iron Steel Research | Servo control devices |
-
1973
- 1973-01-11 FR FR7301503A patent/FR2214053B1/fr not_active Expired
- 1973-12-31 IT IT7092573A patent/IT1000686B/en active
-
1974
- 1974-01-04 GB GB50474A patent/GB1455192A/en not_active Expired
- 1974-01-04 DE DE19742400299 patent/DE2400299A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR2214053A1 (en) | 1974-08-09 |
| DE2400299A1 (en) | 1974-07-18 |
| FR2214053B1 (en) | 1976-11-05 |
| IT1000686B (en) | 1976-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |