US3664265A - Process for the alignment of railway tracks - Google Patents

Process for the alignment of railway tracks Download PDF

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Publication number
US3664265A
US3664265A US29333A US3664265DA US3664265A US 3664265 A US3664265 A US 3664265A US 29333 A US29333 A US 29333A US 3664265D A US3664265D A US 3664265DA US 3664265 A US3664265 A US 3664265A
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Prior art keywords
track
desired position
return
points
correction value
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US29333A
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English (en)
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Gerard Sauterel
Andre Fornerod
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Matisa Materiel Industriel SA
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Matisa Materiel Industriel SA
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B33/00—Machines or devices for shifting tracks, with or without lifting, e.g. for aligning track, for shifting excavator track
    • E01B33/02—Machines or devices for shifting tracks, with or without lifting, e.g. for aligning track, for shifting excavator track for slewing, i.e. transversely shifting, in steps

Definitions

  • PROCESS FOR THE ALIGNMENT OF RAILWAY TRACKS Alignment is an operation carried out during the straightening of railway tracks, either using an independent alignment machine serving solely for this operation or using a more complex machine of the tamping-levelling-aligning type which simultaneously aligns, levels and tamps the track.
  • This alignment operation consists of eliminating, by a lateral displacement of the track using a force apparatus, the difference detected at successive points between the position of the track and the position desired at these points, said desired position being defined by a reference means.
  • This operation is generally automatic.
  • This track return phenomenon is due to the release of stresses previously existing or introduced into the track during its displacement by the force apparatus, a phenomenon which is made worse in the curves in the case of the simultaneous straightening of the track profile by a tamping-levelling-aligning machine by the lateral component of the natural weight of the raised portion of the track.
  • This latter process offers a high degree of accuracy but involves a double alignment at each corrected point of the track.
  • the process forming the object of the invention aims at integrating into the performance of each automatic alignment cycle, an operation, likewise automatic, for compensating errors due to the track return phenomenon, without it being necessary to shift each corrected point of the track twice; this feature permits without difficulty, the use of the process for tamping-levelling-aligning machines, as well as for independent alignment machines.
  • This process is characterized by the fact that the alignment value at each point of the track to be corrected is composed of the algebraic sum of the value of the variation detected at this point relative to the theoretical alignment and a correction of which the value is a function of the track return measurement, performed at at least one of the previously straightened points.
  • FIG. 1 which illustrates this process, is shown a track V to be straightened according to a theoretical alignment XY.
  • This track has the variations a,, a, a compared with the theoretical alignment at points 1, 2 N.
  • this recorded value r is added to the detected variation a, between the point 2 and its desired position on XY, so that this point 2 of track is aligned by a value 4': at 2 so that:
  • r can also be obtained by addition of the values b,, and c,, values measured relative to the desired alignment XY.
  • the first absolute return value r is equal to its relative return value 0 because the track was aligned on XY
  • the process also permits, if necessary, the return measurement to be affected by a certain factor K, selected according to the characteristics of the portion of track to be straightened.
  • FIGS. 2 and 3 attached show means, given as an example, for performing this process.
  • FIG. 2 shows'schema'tically a reference means suitable for straightening the track path.
  • FIG. 3 (and 3 is the diagram of the hydraulic and electric circuits involved in the scope of the process according to the invention, said circuits being in the non-operative state.
  • FIG. 2 shows schematically a relative base reference of a known type using four potentiometers A,B,C,X, kept in contact with a line of rails 13 and connected with one another via an articulated transmission system designed in such a way as to permit the detection of any variation in the potentiometer X from the geometrical alignment defined by the three other potentiometers A,B,C.
  • the four transducers A, B C", X move with a railway machine which comprises, at least in proximity to the potentiometer X, a track alignment means represented in FIG. 3 by the alignment rollers 14.
  • the potentiometer X transmits its movements to the core 17 of a transducer 18, the casing of this sensor 18 being con nected mechanically to the three potentiometers A, B, C
  • This sensor 18 transforms the relative movements of its core 17 into electrical signals and in this case is a known type of electrical transducer having a differential transformer sensitive to the linear displacements of its core 17.
  • the primary winding is fed by an alternating voltage of predetermined characteristics. Its two secondary windings l6 feed a closed circuit having two branches, of which each comprises an amplifier 19 and a primary winding of a transformer 20.
  • This closed circuit is designedin such a way that when the core 17 occupies a position which is symmetrical relative to the two secondary windings 16, the latter produce voltages of equal amplitude. Under the action of a movement of the core 17 caused by a displacement of the track level with potentiometer X, these two voltages differ in respect of their amplitude and phase, which permits their comparison by means of a measuring bridge.
  • the two voltages induced in the secondary windings of the transformers 20 are rectified by the demodulators 22 and diverted to two motorized potentiometers 23 and 24 by means of switches operated by electromagnetic relays. Switches 40,, and 40,, operated simultaneously by the relay 40 serve to invert, one relative to the other, the motorized potentiometers 23 and 24.
  • Switches 41, and 41,, operated by the relay 41 fulfil the same function.
  • Each of the motorized potentiometers comprises a fixed central tapping (B for 23 and C for 24) and a mobile wiper; wiper A of potentiometer 23 being operated by the electrical servomotor 27 and wiper D of potentiometer 24 by motor 28.
  • a variation indicator 31 connected to the two center points B and C-of potentiometers 23 and 24 indicates the value of the error detected relative to the zero point of the reference means.
  • the voltage between points A and C or B and D defined hereinbefore constitutes the signal used for the track alignment switch.
  • the voltage between points A and D defined hereinbefore constitutes the signal used for determining the track position, this signal serving for re-establishing the equilibrium of the measuring bridge by shunting onto one of the motors 27 or 28, displacing the wipers A or D through the filter 29 and amplifier 30.
  • this signal is shunted on the control solenoid 33 of the servo-valve (33-34) through the filter 29 and the amplifier 30, as a function of the equilibration of the sources.
  • the resistance 10, capacitor 9 and diode 8 serve to attract by impulsion the relay 4 which earths the input of the amplifier 30, via switch 4,.
  • the alignment control signal is directed at the control solenoid 33 of servo-valve 34 which interconnects the pipes linking the two pressure chambers of a double-action jack 37 on the one hand to a pump 35 supplying the motor fluid and on the other to a tank for said fluid 36, in a conventional and known manner.
  • the servo-valve 34 occupies its median position, where the pressure chambers of the jack 37 are closed.
  • the servo-valve is symmetrically and progressively controlled depending on the amplitude and sign of the electric signal.
  • a double potentiometer 38-39 permits, by the double displacement of the wipers, the division of the voltage at the terminals of the wipers A and D relative to the median points B and C of the corresponding otentiometers.
  • the operator operates the automatic alignment pedal 42 (FIG. 3'), which has the efi'ect of attracting simultaneously relays 1 and 6, then the delayed relay 2.
  • the error signal is taken between A the wiper of the motorized potentiometer 23 connected to the control solenoid 33 of servo-valve 34 via contacts 5,, 1 filter 29, amplifier 30, contact 1,. and the median fixed point C of motorized potentiometer 24, connected to earth via contacts 5,, and I
  • the servo-valve 34 controls the lateral displacement of the track according to the size and direction of the error, up to the cancelling out of same.
  • relay 1 When the operator releases the automatic alignment pedal 42 relay 1 is released, whilst delayed relay 2 remains attracted during the discharge time of its capacitor 7, which permits the relays 3 and 41 to attract via contacts 1,, 2,, and 5 relay 5 is attracted via 6,, and 1,, Whilst relay 6 remains attracted via 6,, and 1 (For the satisfactory operation of relays 5 and 6, a capacitor 6 is connected to the terminals of relay 6 in such a way that the latter remains attracted during the switching period of contacts 5,,, l, and 1,).
  • Relay 41 reverses the motorized potentiometer 24 for the return measurement time in order to reverse this measurement relative to zero in such a way that it is added to the error detected in the following alignment phase.
  • This return measurement signal is taken between the wiper A of motorized potentiometer 23 connected to the servomotor 28 via contacts 3,, and 1 filter 29, amplifier 30 and contacts 1,. and 41,, and the wiper D of potentiometer 24 con nected to earth via contacts 3,, and 1,,. Motor 28 displaces the wiper D of potentiometer 24 until the measuring bridge is again in equilibrium.
  • Phase III Advance of the machine from point 1 to point 2 (FIG. 1)
  • Phase IV Automatic alignment of the track with correction (positioning ofthe track from 2 to 2 FIG. 1).
  • the error signal is taken between B, the median point of the motorized potentiometer 23 connected to the solenoid of the servo valve 34 via contacts S and 1 filter 29, amplifier 30 and contact 1,. and the wiper D of motorized potentiometer 24 connected to earth via contacts 5,, and 1 It must be remembered that in phase 2 of the track return measurement, wiper D of potentiometer 24 was positioned by servomotor 28 so as to balance the measuring bridge after inverting the poten tiometer 24, resulting in the error measurement in this phase being composed of the algebraic sum of the error measurement relative to zero and of the return measurement performed in phase 2.
  • the servo-valve 34 controls the lateral displacement of the track according to the size and direction of this total error signal, until the cancellation of same by balancing the sources.
  • relays l and 5 are released, whilst delayed relay 2 remains attracted by its capacitor as well as 3 and 40 via switches l,,, 2,, and 5,, during the return measurement time.
  • phase cycle then recommences at phase 1, noting that this phase is an automatic alignment with correction as a function of the previous return measurement made in phase to be performed thus throughout the alignment process.
  • the means described also comprises a double potentiometer 3839, connected to the measurement circuit of the motorized potentiometers 23 and 24 which permits, by simultaneous displacements of their wipers, the variation of the amplitude of the track return measurement signal according to a particular coefficient selected as a function of the track characteristicsto be straightened.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Control Of Position Or Direction (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
US29333A 1969-03-24 1970-03-20 Process for the alignment of railway tracks Expired - Lifetime US3664265A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH437269A CH482867A (fr) 1969-03-24 1969-03-24 Procédé de dressage des voies ferrées et équipement pour la mise en oeuvre de ce procédé

Publications (1)

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US3664265A true US3664265A (en) 1972-05-23

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US29333A Expired - Lifetime US3664265A (en) 1969-03-24 1970-03-20 Process for the alignment of railway tracks

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US (1) US3664265A (fr)
AT (1) AT300878B (fr)
CH (1) CH482867A (fr)
DE (1) DE2013701C3 (fr)
FR (1) FR2039859A5 (fr)
GB (1) GB1306281A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166291A (en) * 1977-12-21 1979-08-28 Canron, Inc. Chord liner using angle measurement
US20180106000A1 (en) * 2015-06-17 2018-04-19 Plasser & Theurer Export Von Bahnbaumschinen Gesellschaft M.B.H. Method for determining vertical and lateral position faults of a track and track maintenance machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5220063A (en) * 1991-05-10 1993-06-15 Hoechst Celanese Corporation Method for the preparation of arylalkanolacylamides
DE19911625C2 (de) * 1999-03-16 2001-07-12 Loh Kg Rittal Werk Bausatz für ein Gehäuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3380394A (en) * 1965-08-27 1968-04-30 Matisa Materiel Ind Sa Equipment for determining the geometric condition of a track and controlling the slew or lift thereof
US3486461A (en) * 1967-02-06 1969-12-30 Plasser Bahnbaumasch Franz Method and apparatus for aligning track
US3547039A (en) * 1967-11-14 1970-12-15 Plasser Bahnbaumasch Franz Track lining apparatus
US3552319A (en) * 1967-07-13 1971-01-05 Plasser Bahnbaumasch Franz Track lining

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3380394A (en) * 1965-08-27 1968-04-30 Matisa Materiel Ind Sa Equipment for determining the geometric condition of a track and controlling the slew or lift thereof
US3486461A (en) * 1967-02-06 1969-12-30 Plasser Bahnbaumasch Franz Method and apparatus for aligning track
US3552319A (en) * 1967-07-13 1971-01-05 Plasser Bahnbaumasch Franz Track lining
US3547039A (en) * 1967-11-14 1970-12-15 Plasser Bahnbaumasch Franz Track lining apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166291A (en) * 1977-12-21 1979-08-28 Canron, Inc. Chord liner using angle measurement
US20180106000A1 (en) * 2015-06-17 2018-04-19 Plasser & Theurer Export Von Bahnbaumschinen Gesellschaft M.B.H. Method for determining vertical and lateral position faults of a track and track maintenance machine
US10619313B2 (en) * 2015-06-17 2020-04-14 Plasser & Theurer Export Von Bahnbaumaschinen Gesellschaft M.B.H. Method for determining vertical and lateral position faults of a track and track maintenance machine

Also Published As

Publication number Publication date
CH482867A (fr) 1969-12-15
AT300878B (de) 1972-08-10
GB1306281A (fr) 1973-02-07
DE2013701C3 (de) 1974-09-19
DE2013701A1 (de) 1970-10-01
FR2039859A5 (fr) 1971-01-15

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