WO2013102942A4 - Method for operating railroad switches, and oil hydraulic circuit for realising the method - Google Patents
Method for operating railroad switches, and oil hydraulic circuit for realising the method Download PDFInfo
- Publication number
- WO2013102942A4 WO2013102942A4 PCT/IT2013/000001 IT2013000001W WO2013102942A4 WO 2013102942 A4 WO2013102942 A4 WO 2013102942A4 IT 2013000001 W IT2013000001 W IT 2013000001W WO 2013102942 A4 WO2013102942 A4 WO 2013102942A4
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rail
- switch
- actuator
- piston
- servo
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/04—Fluid-pressure devices for operating points or scotch-blocks
- B61L5/045—Fluid-pressure devices for operating points or scotch-blocks using electrically controlled fluid-pressure operated driving means
Landscapes
- Fluid-Pressure Circuits (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
The present invention concerns a hydraulic circuit comprising a plurality of branches individually operated by a respective servo-valve, which allow the independent operation of as many rail actuators, the service pump being an only one for all the branches. The hydraulic circuit can be used according to the method of the invention to control any hydraulic actuator, and in particular conveniently in the railroad switches by varying pressure along time to avoid bending due to the interference of foreign body with the switch rails.
Claims
AMENDED CLAIMS received by the International Bureau on 12 July 2013 (12.07.13)
1) Method for controlling a railroad switch, the railroad switch comprising at least a switch rail, at least a relevant stock rail, a number N > 1 of rail actuators, a central unit comprising a central oil pump (201 ), a pressure regulation circuit providing a flow rate of oil under pressure to N servo-valves respectively associated to said rail actuators, each rail actuator further comprising:
- a piston associated to said respective servo-valve;
- at least an operation tie-rod for the operation of said at least a switch rail in such a way that said at least a switch rail will position itself as switch close-by or far-removed from the respective at least a stock rail,
- a slidable link block driven by said piston,
- two lock elements each associated to one of the close-by or far removed positions of said at least a switch rail and hinged on an carriage integral to said at least a tie-rod, with two relevant seats wherein the two lock elements engage,
the method comprising the execution of the following sub-sequent steps for each rail actuator:
A. displacing the slidable link block till the first encountered lock element, relevant to the switch rail that is currently close-by, and engaging in the relevant seat the second encountered lock element, relevant to the switch rail that is currently far-removed;
B. continuing the displacement of slidable link block to realize the displacement of the at least a switch rail;
C. continuing the displacement of slidable link block to lock the second lock element in an engaged position in said relevant seat;
the method being characterized in that the piston stroke of each rail actuator is constantly detected by means of a respective volume counter, and in that, for each rail actuator:
- in step A and in a first portion of step B corresponding to first d > 0 mm of travel of said at least a switch rail, providing to the piston, by the respective servo-valve, a pressure with a first value P1;
16
- in a second portion of step B, providing to the piston, by the respective servo-valve, a pressure with a second value P2;
- in a final portion of step B corresponding to the last d' > 0 mm of travel of said at least a switch rail, and in step C, providing to the piston, by the respective servo-valve, a pressure with a third value P3;
wherein P1 > P2≥ P3, and P1, P2, P3 are values pre-determined for each rail actuator in such a way to move said at least a switch rail along its length in a synchronous way.
2) Method according to claim 1 , wherein, when one rail actuator stops because of an obstacle without finishing the travel of the second portion of step B, said at least a switch rail is moved back reproducing steps B and C to displace the switch rail in the opposite direction, by the following steps:
- storing the stroke run by the piston till the stop of said rail actuator;
- providing to all the other rail actuators a flow rate Q that is specific to each rail actuator till a time instant when all the rail actuators reach the position of said one stopped rail actuator, and at this time instant:
- providing to all the rail actuators including said a stopped actuator a flow rate corresponding to the portion of step B or C wherein they find themselves and continue according to the subsequent portions of steps B and C complying with the relevant pressure requirements.
3) Method according to any claim 1 to 2, characterized in that d' and/or d are comprised between 5 and 10 mm, in particular around 5 mm.
4) Method according to any claim 1 to 3, characterized in that in each step A, B, C said servo-valve provides respective flow-rate values QA, QB, QC> pre-determined for each rail actuator and such that QB≠ QA and QB≠ Qc> in such a way that all the actuators realize each of steps A, B, C in a synchronous way.
5) Oil hydraulic circuit (200) for the control and monitoring of a number N≥ 1 of rail actuators, within a railroad switch, each actuator
17
comprising a piston (211 ), the oil hydraulic circuit comprising a central unit including :
- a pump (201 ) connected to N respective servo-valves (206) electrically connected to
- an electronic control unit;
- N volumetric counters (207) associated respectively to said N servo-valves, for the measurement of the volume and therefore the piston stroke;
each servo-valve being associated to said piston (21 1 ) within the respective rail actuator in such a way to be able to control it independently, the oil hydraulic circuit being characterized in that the electronic control unit is provided with means configured to realize the method according to any claim 1 to 5.
6) Oil hydraulic circuit according to claim 5, characterized in that each servo-valve (206) is hydraulically connected to a transducer (209) for the detection of the hydraulic pressure on the piston within each rail actuator, said transducer being electrically connected to said electronic control unit, so as to control along time the servo-valve (206) as a function of the measurement of hydraulic pressure on the piston and the displacement of the same.
7) Oil hydraulic circuit according to claim 5 to 6, characterized in that it further comprises an only transducer (205) for the detection of the maximum hydraulic pressure, hydraulically connected to said N servo- valves (206) and electrically connected to said electronic control unit.
8) Oil hydraulic circuit according to any claim 5 to 7, characterized in that the data detected by said N volume counters (207) and said transducers (209) for the detection of the hydraulic pressure are sent to a remote center to diagnosis ends.
9) Oil hydraulic circuit according to claim 8, characterized in that the data are further sent which have been detected by said an only transducer (205) for the detection of the maximum hydraulic pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000002A ITRM20120002A1 (en) | 2012-01-03 | 2012-01-03 | HYDRAULIC CIRCUIT FOR THE MOVEMENT OF RAILWAY EXCHANGES, AND ITS RELATIVE HANDLING METHOD. |
| ITRM2012A000002 | 2012-01-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2013102942A1 WO2013102942A1 (en) | 2013-07-11 |
| WO2013102942A4 true WO2013102942A4 (en) | 2013-08-29 |
Family
ID=45757118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IT2013/000001 Ceased WO2013102942A1 (en) | 2012-01-03 | 2013-01-03 | Method for operating railroad switches, and oil hydraulic circuit for realising the method |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | ITRM20120002A1 (en) |
| WO (1) | WO2013102942A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3059621B1 (en) * | 2016-12-01 | 2019-07-12 | Vossloh Cogifer | MECHANISM FOR MOVING AND LOCKING IN POSITION OF AT LEAST ONE NEEDLE OF RAIL |
| CN111118979B (en) * | 2020-01-06 | 2021-09-28 | 中铁工程设计咨询集团有限公司 | Novel straddle type monorail turnout |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60306102T2 (en) * | 2003-03-21 | 2007-04-19 | Alcatel | Soft drive system |
| EP2192020B1 (en) * | 2008-11-27 | 2011-11-09 | ALSTOM Transport SA | Device for moving railroad switch points, particulary high-speed ones and method for moving railroad switch points |
| CZ21157U1 (en) * | 2010-04-14 | 2010-08-09 | DT-VÝHYBKÁRNA A STROJÍRNA, a.s. | Lock system hydraulic device with parallel connected hydraulic cylinders in rail-switches |
-
2012
- 2012-01-03 IT IT000002A patent/ITRM20120002A1/en unknown
-
2013
- 2013-01-03 WO PCT/IT2013/000001 patent/WO2013102942A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013102942A1 (en) | 2013-07-11 |
| ITRM20120002A1 (en) | 2013-07-04 |
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