EP3200956B1 - Hydraulic wrench for sleeper screws and operating method - Google Patents

Hydraulic wrench for sleeper screws and operating method Download PDF

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Publication number
EP3200956B1
EP3200956B1 EP15771670.5A EP15771670A EP3200956B1 EP 3200956 B1 EP3200956 B1 EP 3200956B1 EP 15771670 A EP15771670 A EP 15771670A EP 3200956 B1 EP3200956 B1 EP 3200956B1
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EP
European Patent Office
Prior art keywords
hydraulic
hydraulic motor
screwing
hydraulically
pump
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EP15771670.5A
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German (de)
French (fr)
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EP3200956A1 (en
Inventor
Christophe LETANG
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Geismar Alpes SAS
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Societe Turripinoise de Mecanique STUMEC SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/002—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose for special purposes
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
    • E01B29/24—Fixing or removing detachable fastening means or accessories thereof; Pre-assembling track components by detachable fastening means
    • E01B29/28—Fixing or removing detachable fastening means or accessories thereof; Pre-assembling track components by detachable fastening means the fastening means being of screw-and-nut type; Apparatus therefor, adapted to additionally drilling holes

Definitions

  • the invention relates to the field of wrenchplotters with hydraulic transmission and more particularly the management of the screwing / unscrewing of the lag bolts by the wrench.
  • a hydraulic conveyor is equipped with a motor, a hydraulic transmission, a control device and limiting the tightening torque or a hydraulic pressure sensor to know the torque applied to the screw-threads by means of a calibration value match, and one or more tapping heads equipped with hydraulic motors transforming the pressure and hydraulic flow in rotation and torque applied to the lag bolts.
  • An example of a hydraulic conveyor is described in the document FR1206323 A1 intended to ensure the tightening or loosening of lag screws or other connecting elements which fix the rails on the sleepers.
  • the maximum loosening torque is reached at the minimum hydraulic motor speed, this tightening torque being necessary only to unlock the tightening of the lag bolt.
  • the rotational speed can be increased for the rest of the unscrewing because the tightening torque of the lag bolt is lower.
  • the enginers hydraulic transmission are equipped, in known manner, one or two hydraulic pumps or a variable cylinder pump or constant power.
  • a tapper may have one or more heads, a multi-head turret being more advantageous because the yield obtained is logically greater than with a single head since the unscrewing or screwing action is performed on several lag bolts. that time.
  • the object of the invention is to remedy all or some of the aforementioned drawbacks.
  • the two configurations make it possible to optimize the operation of the traction heads and to use small hydraulic motors while maintaining satisfactory performance. Indeed, when the tightening torque at the screwdriver screw / unscrew is weak, we take advantage of this low resistance to screw / unscrew the lag screws at the same time, the first and second hydraulic motors being hydraulically coupled and operating substantially simultaneously . And, when the tightening torque at the bolts to screw / unscrew is resistant, the first and second engines are hydraulically decoupled to operate separately so as to apply all the power at minimum speed on a lag bolt and then on the other.
  • the first and second engines operate in the second configuration alternately or successively.
  • the first hydraulic motor dedicated to the first tapping head and the second hydraulic motor dedicated to the second tapping head are positioned in a single hydraulic circuit.
  • the tying machine comprises at least a first pressure sensor configured to measure the hydraulic pressure at the first hydraulic motor of the first tapping head corresponding to the resistant torque of said first tapping head or at the level of the second hydraulic motor of the second tapping head corresponding to the resistant torque of said second tapping head.
  • the measurement of the pressure is to be compared with a predetermined pressure value corresponding to a threshold value of tightening torque which makes it possible to determine the changeover from one configuration to another.
  • the operation of the auger is optimized and more accurate.
  • the auger comprises at least a first pressure sensor and a second pressure sensor, the first pressure sensor being configured to measure the pressure at a first gripping head configured to screw or unscrew. a first lag bolt and the second pressure sensor being configured to measure pressure at a second bolt head configured to screw or unscrew a second lag bolt.
  • the auger comprises a pump system controlled by the control unit, the pump system comprising at least one hydraulic pump, the pump system being configured to supply fluid to the hydraulic motors as a function of the configuration of said hydraulic motors.
  • the fluid flow delivered by the pump system is greater in the first configuration which requires a higher speed than in the second configuration which requires a lower speed.
  • At least one hydraulic pump is variable displacement or constant power.
  • the pump system comprises at least a first hydraulic pump and a second hydraulic pump, the first hydraulic pump being configured to produce a lower hydraulic flow rate than the flow rate of the second pump.
  • the first hydraulic pump and the second hydraulic pump are configured to operate substantially simultaneously, the first hydraulic pump and the second hydraulic pump being positioned on the same shaft.
  • the hydraulic transmission auger 1 is positioned on a railway track 100 comprising two rails 101 mounted on sleepers by means of lag bolts 102 fitted with elastic fasteners 103.
  • the auger 1 comprises a support on which is mounted a heat engine 6 connected to two hydraulic pumps 8, 9 for hydraulically supplying hydraulic motors 4, 5, a hydraulic tank (not shown) connected to the hydraulic pumps 8, 9.
  • the tying machine 1 comprises an arm extending from the support and at the end of which are arranged two tapping heads 2, 3.
  • Each tapping head 2, 3 is equipped with a hydraulic motor 4, 5.
  • the 2, 3 draw heads are positioned on either side of a rail 101 so as to face each of a lag screw 102 to be screwed / unscrewed.
  • the auger comprises two triggers 11 connected to the control unit and thus indicating to the control unit 12 if the operator wishes to work by screwing or unscrewing.
  • the auger 1 further comprises a control unit 12 driving a hydraulic distribution member 10 which comprises one or more solenoid valves, which send the hydraulic fluid to the hydraulic motors 4, 5.
  • Figures 3 and 4 illustrate a screwing process according to respectively a first mode of operation and a variant of the first mode of operation.
  • a first step 200 the control unit 12 controls the dispensing member 10 so that the first hydraulic motor 4 and the second hydraulic motor 5 are hydraulically connected in series in the hydraulic circuit of the tyfer 1.
  • a second step 201 the first tapping head 2, as well as the second tapping head 3 are each rotated at high speed by respectively the first hydraulic motor 4 and the second hydraulic motor 5.
  • the two tapping heads 2, 3 at the same time screw the tie rod 102 associated with them.
  • the two hydraulic pumps 8, 9 are put into operation and feed the hydraulic motors 4, 5.
  • a third step 202 the pressure is measured at one of the lag screws 102, for example the first lag bolt, by a pressure sensor (not shown).
  • the pressure measured at the first tie rod 102 makes it possible to determine the tightening torque of the latter.
  • a fourth step 203 the pressure measured in third step 202 is compared with a predetermined intermediate pressure.
  • the predetermined intermediate pressure corresponds to a threshold tightening torque value.
  • the control unit If the pressure measured at the third step 202 is greater than or equal to the predetermined intermediate pressure, the control unit considers that the tightening torque applied at the level of the first lag bolt has become resistant and stops the two tapping heads 2, 3 in a fifth step 204.
  • the control unit If the measured pressure is lower than the predetermined intermediate pressure, the control unit considers that the tightening torque applied at the level of the first lag bolt is weak and therefore repeats the second, third and fourth stages 201, 202, 203, up to the pressure measured at the first lag screw 102 is greater than or equal to the predetermined intermediate pressure.
  • the third step 202 may be carried out either at the first lag bolt 102 or at the second bolt 102 screwed, depending on the placement of the pressure sensor. As the two tapping heads 2, 3 are identical and the engines associated with these latter are also, it is assumed that if the tightening torque is considered resistant on the first lag bolt 102, it must be theoretically the same for the second lag bolt 102.
  • a sixth step 205 the control unit 12 of the auger 1 drives the dispensing member 10 so that the first hydraulic motor 4 and the second hydraulic motor 5 are hydraulically decoupled in the hydraulic circuit.
  • the hydraulic motors 4, 5 operate independently of each other and alternately so as to concentrate the hydraulic power on a draw head 2, 3 at a time.
  • the second pump 9 being mounted on the same shaft as the first pump 8 also works but in a closed circuit.
  • a seventh step 206 only one of the tapping heads 2, 3, for example the first tapping head 2 is set in motion.
  • step 207 the pressure is measured at the first lag screw 102 screwed by the first tapping head 2.
  • a ninth step 208 the pressure measured at the eighth step 207 is compared with a predetermined threshold pressure.
  • the predetermined threshold pressure corresponds to a desired final tightening torque value.
  • the first tapping head 2 is stopped in a tenth step 209. If the measured pressure is lower than the predetermined threshold pressure, then the seventh, eighth and ninth stages 206, 207, 208 are repeated until the measured pressure is greater than or equal to the predetermined threshold pressure.
  • the second drawing head 3 is set in motion in an eleventh step 210. Then, in a twelfth step 211, the pressure is measured at the level of the second screw threaded spindle 102. by the second drawing head 3.
  • a thirteenth step 212 the pressure measured at the twelfth step 211 is compared with a predetermined threshold pressure. If the measured pressure is greater or equal to the predetermined threshold pressure, then the second lifting head 3 is stopped in a fourteenth step 213. If the measured pressure is lower than the predetermined threshold pressure, then the eleventh, twelfth and thirteenth steps 210, 211, 212 are repeated until the measured pressure is greater than or equal to the predetermined threshold pressure.
  • FIG. 4 is described a variant of the first mode of operation possible screwing of the auger 1 according to the invention. Only the third 202 ', fourth 203' and fifth 204 'steps differ from the first mode of operation illustrated in FIG. Figure 2A .
  • the screwing method according to the second operating mode uses the same first and second steps 200, 201.
  • a third step 202 ' the pressure is measured at the first lag bolt 102 and also at the second lag bolt 102, by a respective pressure sensor (not shown).
  • a fourth step 203 ' the pressures measured in third step 202' are compared with a predetermined intermediate pressure.
  • control unit 12 If the pressures measured in the third step 202 'are greater than or equal to the predetermined intermediate pressure, the control unit 12 considers that the tightening torque applied at the level of the first lag bolt and at the second lag bolt 102 has become resistant and stops the two drawing heads 2, 3 in a fifth step 204 '.
  • the control unit If the measured pressures are lower than the predetermined intermediate pressure, the control unit considers that the tightening torque applied at the level of the first lag bolt 102 and at the second lag bolt 102 is weak and therefore repeats the second, third and fourth stages 201, 202 ', 203', until the pressure measured at at least one of the lag bolts (first lag bolt or second lag bolt) is greater than or equal to the predetermined intermediate pressure.
  • the tying machine 1 When it is desired to unscrew the lag bolts 102 by means of the turret 1 according to the invention, the tying machine 1 is positioned, and more particularly the two tapping heads 2, 3 respectively facing the two screw bolts, said lag bolts being positioned from on both sides of a rail 101 as illustrated in figure 1 .
  • the unscrewing process corresponds to the screwing steps described in Figures 3 and 4 inversely.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)

Description

L'invention concerne le domaine des tirefonneuses à transmission hydraulique et plus particulièrement la gestion du vissage/dévissage des tirefonds par la tirefonneuse.The invention relates to the field of wrenchplotters with hydraulic transmission and more particularly the management of the screwing / unscrewing of the lag bolts by the wrench.

Pour effectuer le dévissage ou le vissage des tirefonds situés de part et d'autre de chaque rail de voie ferrée, on utilise une machine communément appelée tirefonneuse.To unscrew or screw the lag screws located on either side of each railroad track, a machine commonly known as a wrench is used.

De manière connue, une tirefonneuse à transmission hydraulique est équipée d'une motorisation, d'une transmission hydraulique, d'un dispositif de contrôle et de limitation du couple de serrage ou un capteur de pression hydraulique permettant de connaître le couple de serrage appliqué aux tirefonds grâce à une correspondance des valeurs établie par étalonnage, et d'une ou plusieurs têtes de tirefonnage équipées de moteurs hydrauliques transformant la pression et le débit hydraulique en rotation et couple appliqués aux tirefonds. Un exemple de tirefonneuse à transmission hydraulique est décrite dans le document FR1206323 A1 destinée à assurer le serrage ou le desserrage des tirefonds ou autres éléments de liaisons qui fixent les rails sur les traverses.In a known manner, a hydraulic conveyor is equipped with a motor, a hydraulic transmission, a control device and limiting the tightening torque or a hydraulic pressure sensor to know the torque applied to the screw-threads by means of a calibration value match, and one or more tapping heads equipped with hydraulic motors transforming the pressure and hydraulic flow in rotation and torque applied to the lag bolts. An example of a hydraulic conveyor is described in the document FR1206323 A1 intended to ensure the tightening or loosening of lag screws or other connecting elements which fix the rails on the sleepers.

Pour dévisser un tirefond, le couple de desserrage maximum est atteint à vitesse du moteur hydraulique minimum, ce couple de serrage n'étant nécessaire que pour débloquer le serrage du tirefond. Une fois débloqué, la vitesse de rotation peut être augmentée pour le reste du dévissage car le couple de serrage du tirefond est plus faible. Idéalement, il convient d'utiliser au maximum la puissance du moteur thermique et donc d'adapter la vitesse de rotation du moteur hydraulique afin d'éviter de faire caler le moteur thermique en le sollicitant au-delà de ses capacités.To unscrew a lag bolt, the maximum loosening torque is reached at the minimum hydraulic motor speed, this tightening torque being necessary only to unlock the tightening of the lag bolt. Once unlocked, the rotational speed can be increased for the rest of the unscrewing because the tightening torque of the lag bolt is lower. Ideally, it is appropriate to use the maximum power of the engine and therefore to adapt the speed of rotation of the hydraulic motor to avoid stalling the engine by soliciting beyond its capacity.

Pour visser, le principe est inversé, le couple de serrage est plus faible au début et devient de plus en plus important au fur et à mesure du vissage.To screw, the principle is reversed, the tightening torque is lower at the beginning and becomes more and more important as you screw.

Il est donc avantageux d'avoir au moins deux vitesses de travail distinctes permettant de s'adapter au couple de serrage et à l'action entreprise : dévissage ou vissage.It is therefore advantageous to have at least two distinct working speeds to adapt to the tightening torque and action undertaken: unscrewing or screwing.

Ainsi, les tirefonneuses à transmission hydraulique sont équipées, de manière connue, d'une ou deux pompes hydrauliques ou bien d'une pompe à cylindre variable ou à puissance constante.Thus, the enginers hydraulic transmission are equipped, in known manner, one or two hydraulic pumps or a variable cylinder pump or constant power.

Comme décrit précédemment, une tirefonneuse peut avoir une ou plusieurs têtes, une tirefonneuse à plusieurs têtes étant plus avantageuse car le rendement obtenu est logiquement plus important qu'avec une seule tête puisque l'action de dévissage ou de vissage est réalisée sur plusieurs tirefonds à la fois.As previously described, a tapper may have one or more heads, a multi-head turret being more advantageous because the yield obtained is logically greater than with a single head since the unscrewing or screwing action is performed on several lag bolts. that time.

Cependant, lorsqu'on conçoit une tirefonneuse à deux têtes, il faut alors, en comparaison avec une tirefonneuse à une tête :

  • soit augmenter de manière très significative la partie génératrice de puissance hydraulique qui engendre un surpoids de la machine et des surcoûts,
  • soit conserver une partie génératrice de puissance hydraulique de taille raisonnable mais fonctionnant en mode alternatif des deux têtes, ce qui implique une baisse significative de rendement,
  • soit conserver une partie génératrice de puissance hydraulique de taille raisonnable et répartir la puissance à moitié entre chaque tête. Les têtes reçoivent néanmoins une puissance trop faible et ne parviennent pas à desserrer les tirefonds serrés à des couples importants.
However, when designing a two-headed turret, then, in comparison with a single-headed turret:
  • or significantly increase the hydraulic power generating part which generates an overweight of the machine and additional costs,
  • maintain a hydraulic power generating unit of reasonable size but operating in an alternative mode of the two heads, which implies a significant reduction in efficiency,
  • either keep a reasonably large hydraulic power generating part and distribute power halfway between each head. The heads, however, receive a power too low and fail to loosen tight lag bolts at large torques.

L'invention a pour but de remédier à tout ou partie des inconvénients précités.The object of the invention is to remedy all or some of the aforementioned drawbacks.

L'invention a pour objet une tirefonneuse à transmission hydraulique comprenant au moins une première tête de tirefonnage et une deuxième tête de tirefonnage, lesdites première et deuxième têtes de tirefonnage étant destinées à visser ou dévisser des tirefonds de voie ferrée, au moins un premier et un deuxième moteurs hydrauliques adaptés pour entrainer en rotation respectivement la première tête de tirefonnage et la deuxième tête de tirefonnage, une unité de commande configurée pour commander le premier et le deuxième moteurs hydrauliques, au moins une pompe hydraulique destinée à alimenter hydrauliquement le premier et le deuxième moteurs hydrauliques, caractérisée en ce que la tirefonneuse comprend en outre au moins un organe de distribution hydraulique piloté par l'unité de commande pour :

  • dans une première configuration relier hydrauliquement en série les premier et deuxième moteurs hydrauliques dans un circuit hydraulique, de sorte que le premier et le deuxième moteurs hydrauliques fonctionnent en simultané lorsque le couple de serrage à exercer est inférieur à une première valeur de couple prédéterminée,
  • dans une deuxième configuration, découpler hydrauliquement les premier et deuxième moteurs hydrauliques dans le circuit hydraulique en orientant le débit et la pression hydraulique seulement vers l'un des premier ou deuxième moteurs hydrauliques lorsque le couple de serrage à exercer est supérieur ou égal à une deuxième valeur de couple prédéterminée.
The subject of the invention is a hydraulic drive-auger comprising at least a first gripping head and a second gripping head, said first and second gripping heads being intended for screwing or unscrewing railway tie-bolts, at least a first and a second hydraulic motor adapted to rotate respectively the first racking head and the second racking head, a control unit configured to control the first and second hydraulic motors, at least one hydraulic pump for hydraulically feeding the first and the second second hydraulic motors, characterized in that the auger further comprises at least one hydraulic distribution member driven by the control unit for:
  • in a first configuration hydraulically connect in series the first and second hydraulic motors in a hydraulic circuit, so that the first and second hydraulic motors operate simultaneously when the torque to be exerted is less than a first predetermined torque value,
  • in a second configuration, hydraulically decouple the first and second hydraulic motors in the hydraulic circuit by directing the flow and the hydraulic pressure only to one of the first or second hydraulic motors when the torque to be exerted is greater than or equal to a second predetermined torque value.

Les deux configurations permettent d'optimiser le fonctionnement des têtes de tirefonnage et d'utiliser des moteurs hydrauliques peu volumineux tout en conservant un rendement satisfaisant. En effet, lorsque le couple de serrage au niveau du tirefond à visser/dévisser est peu résistant, on profite de cette faible résistance pour visser/dévisser les tirefonds en même temps, les premier et deuxième moteurs hydrauliques étant couplés hydrauliquement et fonctionnant sensiblement en simultané. Et, lorsque le couple de serrage au niveau des tirefonds à visser/dévisser est résistant, les premier et deuxième moteurs sont découplés hydrauliquement pour fonctionner séparément de manière à appliquer toute la puissance à vitesse minimale sur un tirefond puis sur l'autre.The two configurations make it possible to optimize the operation of the traction heads and to use small hydraulic motors while maintaining satisfactory performance. Indeed, when the tightening torque at the screwdriver screw / unscrew is weak, we take advantage of this low resistance to screw / unscrew the lag screws at the same time, the first and second hydraulic motors being hydraulically coupled and operating substantially simultaneously . And, when the tightening torque at the bolts to screw / unscrew is resistant, the first and second engines are hydraulically decoupled to operate separately so as to apply all the power at minimum speed on a lag bolt and then on the other.

Préférentiellement, les premier et deuxième moteurs fonctionnent dans la deuxième configuration de manière alternative ou successive.Preferably, the first and second engines operate in the second configuration alternately or successively.

Selon une caractéristique de l'invention, le premier moteur hydraulique dédié à la première tête de tirefonnage et le deuxième moteur hydraulique dédié à la deuxième tête de tirefonnage sont positionnés dans un seul et même circuit hydraulique.According to one characteristic of the invention, the first hydraulic motor dedicated to the first tapping head and the second hydraulic motor dedicated to the second tapping head are positioned in a single hydraulic circuit.

Selon une caractéristique de l'invention, la tirefonneuse comprend au moins un premier capteur de pression configuré pour mesurer la pression hydraulique au niveau du premier moteur hydraulique de la première tête de tirefonnage correspondant au couple résistant de ladite première tête de tirefonnage ou au niveau du deuxième moteur hydraulique de la deuxième tête de tirefonnage correspondant au couple résistant de ladite deuxième tête de tirefonnage. La mesure de la pression est à comparer avec une valeur de pression prédéterminée correspondant à une valeur seuil de couple de serrage qui permet de déterminer le basculement d'une configuration à une autre. Ainsi, le fonctionnement de la tirefonneuse est optimisé et plus précis.According to a characteristic of the invention, the tying machine comprises at least a first pressure sensor configured to measure the hydraulic pressure at the first hydraulic motor of the first tapping head corresponding to the resistant torque of said first tapping head or at the level of the second hydraulic motor of the second tapping head corresponding to the resistant torque of said second tapping head. The measurement of the pressure is to be compared with a predetermined pressure value corresponding to a threshold value of tightening torque which makes it possible to determine the changeover from one configuration to another. Thus, the operation of the auger is optimized and more accurate.

Selon une caractéristique de l'invention, la tirefonneuse comprend au moins un premier capteur de pression et un deuxième capteur de pression, le premier capteur de pression étant configuré pour mesurer la pression au niveau d'une première tête de tirefonnage configurée pour visser ou dévisser un premier tirefond et le deuxième capteur de pression étant configuré pour mesurer la pression au niveau d'une deuxième tête de tirefonnage configurée pour visser ou dévisser un deuxième tirefond.According to a characteristic of the invention, the auger comprises at least a first pressure sensor and a second pressure sensor, the first pressure sensor being configured to measure the pressure at a first gripping head configured to screw or unscrew. a first lag bolt and the second pressure sensor being configured to measure pressure at a second bolt head configured to screw or unscrew a second lag bolt.

Selon une caractéristique de l'invention, la tirefonneuse comprend un système de pompe piloté par l'unité de commande, le système de pompe comprenant au moins une pompe hydraulique, le système de pompe étant configuré pour alimenter en fluide les moteurs hydrauliques en fonction de la configuration desdits moteurs hydrauliques.According to one characteristic of the invention, the auger comprises a pump system controlled by the control unit, the pump system comprising at least one hydraulic pump, the pump system being configured to supply fluid to the hydraulic motors as a function of the configuration of said hydraulic motors.

Ainsi, le débit de fluide délivré par le système de pompe est plus important dans la première configuration qui nécessite une plus grande vitesse que dans la deuxième configuration qui nécessite une plus faible vitesse.Thus, the fluid flow delivered by the pump system is greater in the first configuration which requires a higher speed than in the second configuration which requires a lower speed.

Selon une caractéristique de l'invention, au moins une pompe hydraulique est à cylindrée variable ou à puissance constante.According to a characteristic of the invention, at least one hydraulic pump is variable displacement or constant power.

Alternativement, le système de pompe comprend au moins une première pompe hydraulique et une deuxième pompe hydraulique, la première pompe hydraulique étant configurée pour produire un débit hydraulique plus faible que le débit de la deuxième pompe.Alternatively, the pump system comprises at least a first hydraulic pump and a second hydraulic pump, the first hydraulic pump being configured to produce a lower hydraulic flow rate than the flow rate of the second pump.

Selon une caractéristique de l'invention, la première pompe hydraulique et la deuxième pompe hydraulique sont configurées pour fonctionner sensiblement simultanément, la première pompe hydraulique et la deuxième pompe hydraulique étant positionnées sur un même arbre.According to a characteristic of the invention, the first hydraulic pump and the second hydraulic pump are configured to operate substantially simultaneously, the first hydraulic pump and the second hydraulic pump being positioned on the same shaft.

L'invention a également pour objet un procédé de commande de l'organe de distribution de la tirefonneuse selon l'invention pour le serrage de tirefonds, ledit procédé de commande comprenant au moins les étapes suivantes :

  • étape A: pilotage par l'unité de commande de l'organe de distribution de manière à ce que le premier moteur hydraulique et le deuxième moteur hydraulique soient reliés hydrauliquement en série dans le circuit hydraulique, le premier moteur hydraulique et le deuxième moteur hydraulique fonctionnant simultanément et étant alimentés hydrauliquement par la première et la deuxième pompes hydrauliques,
  • étape D : lorsqu'une première valeur de pression seuil déterminée correspondant à une première valeur de couple au niveau d'au moins un des tirefonds à visser/dévisser, est atteinte,
alors l'unité de commande pilote l'organe de distribution de manière à ce que le premier moteur hydraulique et le deuxième moteur hydraulique soient découplés hydrauliquement dans le circuit hydraulique, le premier moteur hydraulique étant mis en fonctionnement et étant alimenté hydrauliquement par la première pompe hydraulique, tandis que le deuxième moteur hydraulique est arrêté,
  • étape E : lorsqu'une première valeur de pression seuil finale déterminée correspondant à une valeur de couple final au niveau du tirefond à visser par la première tête de tirefonnage entrainée par le premier moteur hydraulique, est atteinte, le premier moteur hydraulique est arrêté et le deuxième moteur hydraulique est mis en fonctionnement et est alimenté hydrauliquement par la première pompe hydraulique,
  • étape F : lorsqu'une deuxième valeur de pression seuil finale déterminée correspondant à une valeur de couple final au niveau du tirefond à visser par la deuxième tête de tirefonnage entrainée par le deuxième moteur hydraulique, est atteinte, alors le deuxième moteur hydraulique est arrêté.
The subject of the invention is also a method for controlling the delivery member of the tying machine according to the invention for tightening lag screws, said control method comprising at least the following steps:
  • step A: control by the control unit of the dispenser member so that the first hydraulic motor and the second hydraulic motor are hydraulically connected in series in the hydraulic circuit, the first hydraulic motor and the second hydraulic motor operating simultaneously and being fed hydraulically by the first and the second hydraulic pumps,
  • step D: when a first determined threshold pressure value corresponding to a first torque value at at least one of the lag screws to be screwed / unscrewed, is reached,
then the control unit controls the dispenser member so that the first hydraulic motor and the second hydraulic motor are hydraulically decoupled in the hydraulic circuit, the first hydraulic motor being operated and being fed hydraulically by the first pump hydraulic, while the second hydraulic motor is stopped,
  • step E: when a first determined final threshold pressure value corresponding to a final torque value at the lag screw to be screwed by the first tapping head driven by the first hydraulic motor, is reached, the first hydraulic motor is stopped and the second hydraulic motor is put into operation and is fed hydraulically by the first hydraulic pump,
  • step F: when a second determined final threshold pressure value corresponding to a final torque value at the lag screw to be screwed by the second tapping head driven by the second hydraulic motor, is reached, then the second hydraulic motor is stopped.

Selon une caractéristique de l'invention, le procédé de commande comprend une étape supplémentaire réalisée après l'étape A et consistant à :

  • étape B : lorsqu'une deuxième valeur de pression seuil déterminée correspondant à une deuxième valeur de couple au niveau d'au moins un des tirefonds à visser/dévisser, est atteinte,
alors l'unité de commande pilote l'organe de distribution de manière à ce que le premier moteur hydraulique et le deuxième moteur hydraulique soient découplés hydrauliquement dans le circuit hydraulique, le premier moteur hydraulique et le deuxième moteur hydraulique fonctionnant simultanément et étant alimentés hydrauliquement par la première et la deuxième pompes hydrauliques,According to one characteristic of the invention, the control method comprises an additional step carried out after step A and consisting of:
  • step B: when a second determined threshold pressure value corresponding to a second torque value at at least one of the lag screws to be screwed / unscrewed, is reached,
then the control unit controls the dispensing member so that the first hydraulic motor and the second hydraulic motor are hydraulically decoupled in the hydraulic circuit, the first hydraulic motor and the second hydraulic motor operating simultaneously and being fed hydraulically by the first and the second hydraulic pumps,

Selon une caractéristique de l'invention, le procédé de commande comprend une étape supplémentaire réalisée après l'étape B et consistant à :

  • étape C : lorsqu'une troisième valeur de pression seuil déterminée correspondant à une troisième valeur de couple au niveau d'au moins un des tirefonds à visser/dévisser, est atteinte,
alors l'unité de commande pilote l'organe de distribution de manière à ce que le premier moteur hydraulique et le deuxième moteur hydraulique soient reliés hydrauliquement en série dans le circuit hydraulique, le premier moteur hydraulique et le deuxième moteur hydraulique fonctionnant simultanément et étant alimentés hydrauliquement seulement par la première pompe hydraulique.According to one characteristic of the invention, the control method comprises an additional step carried out after step B and consisting of:
  • step C: when a third determined threshold pressure value corresponding to a third torque value at at least one of the lag screws to be screwed / unscrewed, is reached,
then the control unit controls the dispenser member so that the first hydraulic motor and the second hydraulic motor are hydraulically connected in series in the hydraulic circuit, the first hydraulic motor and the second hydraulic motor operating simultaneously and being powered hydraulically only by the first hydraulic pump.

L'invention sera mieux comprise, grâce à la description ci-après, qui se rapporte à un ou plusieurs modes de réalisation selon la présente invention, donnés à titre d'exemples non limitatifs et expliqués avec référence aux dessins schématiques annexés, dans lesquels:

  • la figure 1 est une vue en perspective de la tirefonneuse selon l'invention,
  • la figure 2A illustre schématiquement une première configuration des moteurs hydrauliques de la tirefonneuse représentée en figure 1,
  • la figure 2B illustre schématiquement une deuxième configuration des moteurs hydrauliques de la tirefonneuse représentée en figure 1,
  • La figure 3 illustre un procédé de vissage selon l'invention, et,
  • la figure 4 illustre une variante du procédé de vissage selon l'invention,
The invention will be better understood, thanks to the following description, which relates to one or more embodiments according to the present invention, given as non-limiting examples and explained with reference to the appended diagrammatic drawings, in which:
  • the figure 1 is a perspective view of the teaser according to the invention,
  • the Figure 2A schematically illustrates a first configuration of the hydraulic motors of the tedder represented in figure 1 ,
  • the Figure 2B schematically illustrates a second configuration of the hydraulic motors of the tedder represented in figure 1 ,
  • The figure 3 illustrates a screwing method according to the invention, and,
  • the figure 4 illustrates a variant of the screwing method according to the invention,

Comme illustré en figure 1, la tirefonneuse 1 à transmission hydraulique selon l'invention, est positionnée sur une voie ferrée 100 comprenant deux rails 101 montés sur des traverses au moyen de tirefonds 102 équipés d'attaches élastiques 103.As illustrated in figure 1 the hydraulic transmission auger 1 according to the invention is positioned on a railway track 100 comprising two rails 101 mounted on sleepers by means of lag bolts 102 fitted with elastic fasteners 103.

La tirefonneuse 1 comprend un support sur lequel est monté un moteur thermique 6 relié à deux pompes hydrauliques 8, 9 destinées à alimenter hydrauliquement des moteurs hydrauliques 4, 5, un réservoir hydraulique (non représenté) raccordé audites pompes hydrauliques 8, 9.The auger 1 comprises a support on which is mounted a heat engine 6 connected to two hydraulic pumps 8, 9 for hydraulically supplying hydraulic motors 4, 5, a hydraulic tank (not shown) connected to the hydraulic pumps 8, 9.

En outre, la tirefonneuse 1 comprend un bras s'étendant depuis le support et à l'extrémité duquel sont agencées deux têtes de tirefonnage 2, 3. Chaque tête de tirefonnage 2, 3 est équipée d'un moteur hydraulique 4, 5. Les têtes de tirefonnage 2, 3 sont positionnées de part et d'autre d'un rail 101 de manière à être en regard chacune d'un tirefond 102 à visser/dévisser.In addition, the tying machine 1 comprises an arm extending from the support and at the end of which are arranged two tapping heads 2, 3. Each tapping head 2, 3 is equipped with a hydraulic motor 4, 5. The 2, 3 draw heads are positioned on either side of a rail 101 so as to face each of a lag screw 102 to be screwed / unscrewed.

De plus, la tirefonneuse comprend deux gâchettes 11 reliées à l'unité de commande et indiquant ainsi à l'unité de commande 12 si l'opérateur souhaite travailler en vissage ou en dévissage.In addition, the auger comprises two triggers 11 connected to the control unit and thus indicating to the control unit 12 if the operator wishes to work by screwing or unscrewing.

En figure 1, la tirefonneuse 1 comprend en outre une unité de commande 12 pilotant un organe de distribution hydraulique 10 qui comprend une ou plusieurs électrovannes, qui envoient le fluide hydraulique aux moteurs hydrauliques 4, 5.In figure 1 , the auger 1 further comprises a control unit 12 driving a hydraulic distribution member 10 which comprises one or more solenoid valves, which send the hydraulic fluid to the hydraulic motors 4, 5.

L'organe de distribution hydraulique est commandé selon le procédé de commande suivant :

  • étape A: pilotage par l'unité de commande de l'organe de distribution de manière à ce que le premier moteur hydraulique et le deuxième moteur hydraulique soient reliés hydrauliquement en série dans le circuit hydraulique, le premier moteur hydraulique et le deuxième moteur hydraulique fonctionnant simultanément et étant alimentés hydrauliquement par la première et la deuxième pompes hydrauliques, comme illustré en figure 2A,
  • étape D : lorsqu'une première valeur de pression seuil déterminée correspondant à une première valeur de couple au niveau d'au moins un des tirefonds à visser/dévisser, est atteinte,
alors l'unité de commande pilote l'organe de distribution de manière à ce que le premier moteur hydraulique et le deuxième moteur hydraulique soient découplés hydrauliquement dans le circuit hydraulique, le premier moteur hydraulique étant mis en fonctionnement et étant alimenté hydrauliquement par la première pompe hydraulique, tandis que le deuxième moteur hydraulique est arrêté, comme illustré en figure 2B,
  • étape E : lorsqu'une première valeur de pression seuil finale déterminée correspondant à une valeur de couple final au niveau du tirefond à visser par la première tête de tirefonnage entrainée par le premier moteur hydraulique, est atteinte, le premier moteur hydraulique est arrêté et le deuxième moteur hydraulique est mis en fonctionnement et est alimenté hydrauliquement par la première pompe hydraulique,
  • étape F : lorsqu'une deuxième valeur de pression seuil finale déterminée correspondant à une valeur de couple final au niveau du tirefond à visser par la deuxième tête de tirefonnage entrainée par le deuxième moteur hydraulique, est atteinte, alors le deuxième moteur hydraulique est arrêté.
The hydraulic distribution member is controlled according to the following control method:
  • step A: control by the control unit of the dispenser member so that the first hydraulic motor and the second hydraulic motor are hydraulically connected in series in the hydraulic circuit, the first hydraulic motor and the second hydraulic motor operating simultaneously and being fed hydraulically by the first and second hydraulic pumps, as illustrated in Figure 2A ,
  • step D: when a first determined threshold pressure value corresponding to a first torque value at at least one of the lag screws to be screwed / unscrewed, is reached,
then the control unit controls the dispenser member so that the first hydraulic motor and the second hydraulic motor are hydraulically decoupled in the hydraulic circuit, the first hydraulic motor being operated and being fed hydraulically by the first pump hydraulic motor, while the second hydraulic motor is stopped, as shown in Figure 2B ,
  • step E: when a first determined final threshold pressure value corresponding to a final torque value at the lag screw to be screwed by the first tapping head driven by the first hydraulic motor, is reached, the first hydraulic motor is stopped and the second hydraulic motor is put into operation and is fed hydraulically by the first hydraulic pump,
  • step F: when a second determined final threshold pressure value corresponding to a final torque value at the lag screw to be screwed by the second tapping head driven by the second hydraulic motor, is reached, then the second hydraulic motor is stopped.

Le fonctionnement de la tirefonneuse selon l'invention va maintenant être décrit. Plus particulièrement, les figures 3 et 4 illustrent un procédé de vissage selon respectivement un premier mode de fonctionnement et une variante du premier mode de fonctionnement.The operation of the drill driver according to the invention will now be described. In particular, Figures 3 and 4 illustrate a screwing process according to respectively a first mode of operation and a variant of the first mode of operation.

Lorsque l'on souhaite visser des tirefonds 102 au moyen de la tirefonneuse 1 selon l'invention, on positionne la tirefonneuse 1 et plus particulièrement les deux têtes de tirefonnage 2, 3 en regard respectivement des deux tirefonds 102 à visser, lesdits tirefonds 102 étant positionnés de part et d'autre d'un rail 101 comme illustré en figure 1.When it is desired to screw lag bolts 102 by means of the tying machine 1 according to the invention, positioning the auger 1 and more particularly the two tapping heads 2, 3 respectively facing the two screw bolts 102 to screw, said lag bolts 102 being positioned on either side of a rail 101 as illustrated in figure 1 .

Le procédé de vissage est maintenant décrit en référence au premier mode de fonctionnement illustré en figure 3. Dans une première étape 200, l'unité de commande 12 pilote l'organe de distribution 10 de manière à ce que le premier moteur hydraulique 4 et le deuxième moteur hydraulique 5 soient reliés hydrauliquement en série dans le circuit hydraulique de la tirefonneuse 1.The screwing method is now described with reference to the first operating mode illustrated in FIG. figure 3 . In a first step 200, the control unit 12 controls the dispensing member 10 so that the first hydraulic motor 4 and the second hydraulic motor 5 are hydraulically connected in series in the hydraulic circuit of the tyfer 1.

Dans une deuxième étape 201, la première tête de tirefonnage 2, ainsi que la deuxième tête de tirefonnage 3 sont chacune entrainée en rotation à grande vitesse par respectivement le premier moteur hydraulique 4 et le deuxième moteur hydraulique 5. Les deux têtes de tirefonnage 2, 3 vissent en même temps le tirefond 102 qui leur est associé. Dans cette configuration, les deux pompes hydrauliques 8, 9, sont mises en fonctionnement et alimentent les moteurs hydrauliques 4, 5.In a second step 201, the first tapping head 2, as well as the second tapping head 3 are each rotated at high speed by respectively the first hydraulic motor 4 and the second hydraulic motor 5. The two tapping heads 2, 3 at the same time screw the tie rod 102 associated with them. In this configuration, the two hydraulic pumps 8, 9 are put into operation and feed the hydraulic motors 4, 5.

Dans une troisième étape 202, on mesure la pression au niveau d'un des tirefonds 102, par exemple le premier tirefond, par un capteur de pression (non représenté). La pression mesurée au niveau du premier tirefond 102 permet de déterminer le couple de serrage de ce dernier.In a third step 202, the pressure is measured at one of the lag screws 102, for example the first lag bolt, by a pressure sensor (not shown). The pressure measured at the first tie rod 102 makes it possible to determine the tightening torque of the latter.

Dans une quatrième étape 203, on compare la pression mesurée en troisième étape 202 avec une pression intermédiaire prédéterminée. La pression intermédiaire prédéterminée correspond à une valeur de couple de serrage seuil.In a fourth step 203, the pressure measured in third step 202 is compared with a predetermined intermediate pressure. The predetermined intermediate pressure corresponds to a threshold tightening torque value.

Si la pression mesurée à la troisième étape 202 est supérieure ou égale à la pression intermédiaire prédéterminée, l'unité de commande considère que le couple de serrage appliqué au niveau du premier tirefond est devenu résistant et arrête les deux têtes de tirefonnage 2, 3 dans une cinquième étape 204.If the pressure measured at the third step 202 is greater than or equal to the predetermined intermediate pressure, the control unit considers that the tightening torque applied at the level of the first lag bolt has become resistant and stops the two tapping heads 2, 3 in a fifth step 204.

Si la pression mesurée est inférieure à la pression intermédiaire prédéterminée, l'unité de commande considère que le couple de serrage appliqué au niveau du premier tirefond est peu résistant et répète donc les deuxième, troisième et quatrième étapes 201, 202, 203, jusqu'à ce que la pression mesurée au niveau du premier tirefond 102 soit supérieure ou égale à la pression intermédiaire prédéterminée.If the measured pressure is lower than the predetermined intermediate pressure, the control unit considers that the tightening torque applied at the level of the first lag bolt is weak and therefore repeats the second, third and fourth stages 201, 202, 203, up to the pressure measured at the first lag screw 102 is greater than or equal to the predetermined intermediate pressure.

La troisième étape 202 peut être réalisée soit au niveau du premier tirefond 102 soit au niveau du deuxième tirefond 102 vissé, en fonction du placement du capteur de pression. Comme les deux têtes de tirefonnage 2, 3 sont identiques et que les moteurs associés à ces dernières le sont également, on suppose que si le couple de serrage est considéré comme résistant sur le premier tirefond 102, il doit en être théoriquement de même pour le deuxième tirefond 102.The third step 202 may be carried out either at the first lag bolt 102 or at the second bolt 102 screwed, depending on the placement of the pressure sensor. As the two tapping heads 2, 3 are identical and the engines associated with these latter are also, it is assumed that if the tightening torque is considered resistant on the first lag bolt 102, it must be theoretically the same for the second lag bolt 102.

Lorsque les deux têtes de tirefonnage 2, 3 sont arrêtées (cinquième étape 204), dans une sixième étape 205, l'unité de commande 12 de la tirefonneuse 1 pilote l'organe de distribution 10 de manière à ce que le premier moteur hydraulique 4 et le deuxième moteur hydraulique 5 soient découplés hydrauliquement dans le circuit hydraulique.When the two clutch heads 2, 3 are stopped (fifth step 204), in a sixth step 205, the control unit 12 of the auger 1 drives the dispensing member 10 so that the first hydraulic motor 4 and the second hydraulic motor 5 are hydraulically decoupled in the hydraulic circuit.

Dans cette configuration, les moteurs hydrauliques 4, 5 fonctionnent indépendamment l'un de l'autre et alternativement de manière à concentrer la puissance hydraulique sur une tête de tirefonnage 2, 3 à la fois. En outre, dans cette configuration, seule la première pompe 8, qui fonctionne à une vitesse plus faible que la deuxième pompe 9, alimente alternativement le premier et le deuxième moteur hydraulique 4, 5. La deuxième pompe 9 étant montée sur le même arbre que la première pompe 8 fonctionne également mais dans un circuit fermé.In this configuration, the hydraulic motors 4, 5 operate independently of each other and alternately so as to concentrate the hydraulic power on a draw head 2, 3 at a time. In addition, in this configuration, only the first pump 8, which operates at a lower speed than the second pump 9, alternately supplies the first and second hydraulic motors 4, 5. The second pump 9 being mounted on the same shaft as the first pump 8 also works but in a closed circuit.

Dans une septième étape 206, uniquement l'une des têtes de tirefonnage 2, 3, par exemple la première tête de tirefonnage 2 est mise en mouvement.In a seventh step 206, only one of the tapping heads 2, 3, for example the first tapping head 2 is set in motion.

Dans une huitième étape 207, on mesure la pression au niveau du premier tirefond 102 vissé par la première tête de tirefonnage 2.In an eighth step 207, the pressure is measured at the first lag screw 102 screwed by the first tapping head 2.

Dans une neuvième étape 208, on compare la pression mesurée à la huitième étape 207 avec une pression seuil prédéterminée.In a ninth step 208, the pressure measured at the eighth step 207 is compared with a predetermined threshold pressure.

Dans ce premier mode de fonctionnement la pression seuil prédéterminée correspond à une valeur de couple de serrage final désiré.In this first mode of operation, the predetermined threshold pressure corresponds to a desired final tightening torque value.

Si la pression mesurée est supérieure ou égale à la pression seuil prédéterminée alors la première tête de tirefonnage 2 est arrêtée dans une dixième étape 209. Si la pression mesurée est inférieure à la pression seuil prédéterminée, alors les septième, huitième et neuvième étapes 206, 207, 208 sont répétées jusqu'à ce que la pression mesurée soit supérieure ou égale à la pression seuil prédéterminée.If the measured pressure is greater than or equal to the predetermined threshold pressure, then the first tapping head 2 is stopped in a tenth step 209. If the measured pressure is lower than the predetermined threshold pressure, then the seventh, eighth and ninth stages 206, 207, 208 are repeated until the measured pressure is greater than or equal to the predetermined threshold pressure.

Bien entendu, les étapes précédemment décrites (septième 206 à neuvième 208) peuvent être réalisées en partant de la première tête de tirefonnage 2 comme de la deuxième tête de tirefonnage 3.Of course, the steps previously described (seventh 206 to ninth 208) can be carried out starting from the first drawing head 2 as the second drawing head 3.

Une fois la première tête de tirefonnage 2 arrêtée (dixième étape 209), on met en mouvement la deuxième tête de tirefonnage 3 dans une onzième étape 210. Puis, dans une douzième étape 211, on mesure la pression au niveau du deuxième tirefond 102 vissé par la deuxième tête de tirefonnage 3.Once the first drawing head 2 has been stopped (tenth step 209), the second drawing head 3 is set in motion in an eleventh step 210. Then, in a twelfth step 211, the pressure is measured at the level of the second screw threaded spindle 102. by the second drawing head 3.

Dans une treizième étape 212, on compare la pression mesurée à la douzième étape 211 avec une pression seuil prédéterminée. Si la pression mesurée est supérieure ou égale à la pression seuil prédéterminée alors la deuxième tête de tirefonnage 3 est arrêtée dans une quatorzième étape 213. Si la pression mesurée est inférieure à la pression seuil prédéterminée, alors les onzième, douzième et treizième étapes 210, 211, 212 sont répétées jusqu'à ce que la pression mesurée soit supérieure ou égale à la pression seuil prédéterminée.In a thirteenth step 212, the pressure measured at the twelfth step 211 is compared with a predetermined threshold pressure. If the measured pressure is greater or equal to the predetermined threshold pressure, then the second lifting head 3 is stopped in a fourteenth step 213. If the measured pressure is lower than the predetermined threshold pressure, then the eleventh, twelfth and thirteenth steps 210, 211, 212 are repeated until the measured pressure is greater than or equal to the predetermined threshold pressure.

En figure 4 est décrite une variante du premier mode de fonctionnement en vissage possible de la tirefonneuse 1 selon l'invention. Seules les troisième 202', quatrième 203' et cinquième 204' étapes diffèrent du premier mode de fonctionnement illustré en figure 2A.In figure 4 is described a variant of the first mode of operation possible screwing of the auger 1 according to the invention. Only the third 202 ', fourth 203' and fifth 204 'steps differ from the first mode of operation illustrated in FIG. Figure 2A .

Ainsi, le procédé de vissage selon le deuxième mode de fonctionnement reprend les mêmes première et deuxième étapes 200, 201.Thus, the screwing method according to the second operating mode uses the same first and second steps 200, 201.

Puis, dans une troisième étape 202', on mesure la pression au niveau du premier tirefond 102 et également au niveau du deuxième tirefond 102, par un capteur de pression (non représenté) respectif.Then, in a third step 202 ', the pressure is measured at the first lag bolt 102 and also at the second lag bolt 102, by a respective pressure sensor (not shown).

Dans une quatrième étape 203', on compare les pressions mesurées en troisième étape 202' avec une pression intermédiaire prédéterminée.In a fourth step 203 ', the pressures measured in third step 202' are compared with a predetermined intermediate pressure.

Si les pressions mesurées à la troisième étape 202' sont supérieures ou égales à la pression intermédiaire prédéterminée, l'unité de commande 12 considère que le couple de serrage appliqué au niveau du premier tirefond et au niveau du deuxième tirefond 102 est devenu résistant et arrête les deux têtes de tirefonnage 2, 3 dans une cinquième étape 204'.If the pressures measured in the third step 202 'are greater than or equal to the predetermined intermediate pressure, the control unit 12 considers that the tightening torque applied at the level of the first lag bolt and at the second lag bolt 102 has become resistant and stops the two drawing heads 2, 3 in a fifth step 204 '.

Si les pressions mesurées sont inférieures à la pression intermédiaire prédéterminée, l'unité de commande considère que le couple de serrage appliqué au niveau du premier tirefond 102 et au niveau du deuxième tirefond 102 est peu résistant et répète donc les deuxième, troisième et quatrième étapes 201, 202', 203', jusqu'à ce que la pression mesurée au niveau d'au moins un des tirefonds (premier tirefond ou deuxième tirefond) soit supérieure ou égale à la pression intermédiaire prédéterminée.If the measured pressures are lower than the predetermined intermediate pressure, the control unit considers that the tightening torque applied at the level of the first lag bolt 102 and at the second lag bolt 102 is weak and therefore repeats the second, third and fourth stages 201, 202 ', 203', until the pressure measured at at least one of the lag bolts (first lag bolt or second lag bolt) is greater than or equal to the predetermined intermediate pressure.

Le reste des étapes, de la sixième 205 à la quatorzième 213, est identique au premier mode de fonctionnement décrit précédemment.The remainder of the steps, from the sixth 205 to the fourteenth 213, is identical to the first mode of operation described above.

Lorsque l'on souhaite dévisser des tirefonds 102 au moyen de la tirefonneuse 1 selon l'invention, on positionne la tirefonneuse 1 et plus particulièrement les deux têtes de tirefonnage 2, 3 en regard respectivement des deux tirefonds à visser, lesdits tirefonds étant positionnés de part et d'autre d'un rail 101 comme illustré en figure 1.When it is desired to unscrew the lag bolts 102 by means of the turret 1 according to the invention, the tying machine 1 is positioned, and more particularly the two tapping heads 2, 3 respectively facing the two screw bolts, said lag bolts being positioned from on both sides of a rail 101 as illustrated in figure 1 .

Le procédé de dévissage correspond aux étapes de vissage décrites aux figures 3 et 4 de manière inversées.The unscrewing process corresponds to the screwing steps described in Figures 3 and 4 inversely.

De manière optionnelle, il peut être ajouté des étapes de mise en place d'attaches élastiques 103 sur tirefond 102 comme représentées en figure 1. Ces étapes seront alors réalisées comme suit :

  • la tirefonneuse 1 dévisse les tirefonds 102,
  • puis on positionne à l'aide d'une pince des attaches élastiques 103 pré-montées sur chaque tirefond 102 dévissé,
  • puis la tirefonneuse 1 visse les tirefonds 102,
  • la pince s'ouvre et la tirefonneuse 1 est déplacée au niveau d'autres tirefonds et répète les étapes précédentes.
Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et représenté aux figures annexées. Des modifications restent possibles, notamment du point de vue de la constitution des divers éléments ou par substitution d'équivalents techniques, sans sortir pour autant du domaine de protection de l'inventionOptionally, it is possible to add steps of installation of elastic fasteners 103 on the lag bolt 102 as shown in FIG. figure 1 . These steps will then be performed as follows:
  • the teaser 1 unscrews the lag screws 102,
  • then is positioned with a clip of elastic fasteners 103 pre-mounted on each lag bolt 102 unscrewed,
  • then the screw-driver 1 screws the lag screws 102,
  • the gripper opens and the auger 1 is moved to other lag screws and repeats the previous steps.
Of course, the invention is not limited to the embodiment described and shown in the accompanying figures. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims (10)

  1. A screwing machine (1) with hydraulic transmission comprising at least a first screwing head (2) and a second screwing head (3), said first (2) and second (3) screwing heads being intended to screw or unscrew railway sleeper-screws (102), at least a first (4) and a second (5) hydraulic motors adapted to drive in rotation respectively the first screwing head (2) and the second screwing head (3), a control unit (12) configured to control the first (4) and the second (5) hydraulic motors, at least one hydraulic pump (8, 9) intended to hydraulically supply the first (4) and second (5) hydraulic motors, characterized in that the screwing machine (1) further comprises at least one hydraulic distribution member (10) piloted by the control unit (12) for:
    - in a first configuration, hydraulically connecting the first (4) and second (5) hydraulic motors in series in a hydraulic circuit, so that the first (4) and second (5) hydraulic motors operate simultaneously when the tightening torque to be exerted is less than a first predetermined torque value,
    - in a second configuration, hydraulically uncoupling the first (4) and second (5) hydraulic motors in the hydraulic circuit by directing the flow and the hydraulic pressure only to one of the first (4) or second (5) hydraulic motors when the tightening torque to be exerted is greater than or equal to a second predetermined torque value.
  2. The screwing machine according to claim 1, wherein the first (4) and second (5) motors alternately or successively operate in the second configuration.
  3. The screwing machine according to any one of claims 1 or 2, characterized in that the screwing machine (1) comprises at least a first pressure sensor configured to measure the hydraulic pressure at the first hydraulic motor (4) of the first screwing head (2) corresponding to the resisting torque of said first screwing head (2) or at the second hydraulic motor (5) of the second screwing head (3) corresponding to the resisting torque of said second screwing head (3).
  4. The screwing machine according to any one of claims 1 to 3, characterized in that the screwing machine (1) comprises at least a first pressure sensor and a second pressure sensor, the first pressure sensor being configured to measure the pressure at a first screwing head (2) configured to screw or unscrew a first sleeper-screw (102) and the second pressure sensor being configured to measure the pressure at a second screwing head (3) configured to screw or unscrew a second sleeper-screw (102).
  5. The screwing machine according to any one of claims 1 to 4, characterized in that the screwing machine (1) comprises a pump system piloted by the control unit (12), the pump system comprising at least one hydraulic pump, the pump system being configured to supply fluid to the first (4) and second (5) hydraulic motors depending on the configuration of said first (4) and second (5) hydraulic motors.
  6. The screwing machine according to claim 5, characterized in that at least one hydraulic pump (8, 9) can be a variable displacement or constant power hydraulic pump.
  7. The screwing machine according to any one of claims 5 or 6, characterized in that the pump system comprises at least a first (8) and a second (9) hydraulic pumps, the first pump (8) being configured to produce a hydraulic flow rate less than the flow rate of the second pump (9).
  8. A method for controlling a distribution member of a screwing machine according to any one of claims 1 to 7 for tightening sleeper-screws, said control method comprising at least the following steps:
    - step A: piloting the distribution member (10) by the control unit (12) so that the first hydraulic motor (4) and the second hydraulic motor (5) are hydraulically connected in series in the hydraulic circuit, the first hydraulic motor (4) and the second hydraulic motor (5) operating simultaneously and being hydraulically supplied by the first (8) and the second (9) hydraulic pumps,
    - step D: when a first threshold pressure value determined corresponding to a first torque value at least one of the sleeper-screws (102) to be screwed/unscrewed, is reached, then the control unit (12) controls the distribution member (10) so that the first hydraulic motor (4) and the second hydraulic motor (5) are hydraulically uncoupled in the hydraulic circuit, the first hydraulic motor (4) being operated and being hydraulically supplied by the first hydraulic pump (8), while the second hydraulic motor (5) is stopped,
    - step E: when a first final threshold pressure value determined corresponding to a final torque value at the sleeper-screw (102) to be screwed by the first screwing head (2) driven by the first hydraulic motor (4), is reached, the first hydraulic motor (4) is stopped and the second hydraulic motor (5) is operated and is hydraulically supplied by the first hydraulic pump (8),
    - step F: when a second final threshold pressure value determined corresponding to a final torque value at the sleeper-screw (102) to be screwed by the second screwing head (3) driven by the second hydraulic motor (5), is reached, then the second hydraulic motor (5) is stopped.
  9. The control method according to claim 8, wherein an additional step is performed after step A and consists of:
    - step B: when a second threshold pressure value determined corresponding to a second torque value at least one of the sleeper-screws (102) to be screwed/unscrewed, is reached, then the control unit (12) controls the distribution member so that the first hydraulic motor (4) and the second hydraulic motor (5) are hydraulically uncoupled in the hydraulic circuit, the first hydraulic motor (4) and the second hydraulic motor (5) operating simultaneously and being hydraulically supplied by the first (8) and the second (9) hydraulic pumps,
  10. The control method according to claim 9, wherein an additional step is performed after step B and consists of:
    - step C: when a third threshold pressure value determined corresponding to a third torque value at least one of the sleeper-screws (102) to be screwed/unscrewed, is reached, then the control unit (12) controls the distribution member (10) so that the first hydraulic motor (4) and the second hydraulic motor (5) are hydraulically connected in series in the hydraulic circuit, the first hydraulic motor (4) and the second hydraulic motor (5) operating simultaneously and being hydraulically supplied only by the first hydraulic pump (8).
EP15771670.5A 2014-10-01 2015-08-27 Hydraulic wrench for sleeper screws and operating method Active EP3200956B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1459374A FR3026751B1 (en) 2014-10-01 2014-10-01 HYDRAULIC TRANSMISSION SHREDDER AND METHOD FOR CONTROLLING THE SAME
PCT/FR2015/052280 WO2016051032A1 (en) 2014-10-01 2015-08-27 Sleeper screw driving machine with hydraulic transmission and associated control method

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EP3200956A1 EP3200956A1 (en) 2017-08-09
EP3200956B1 true EP3200956B1 (en) 2019-02-27

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EP (1) EP3200956B1 (en)
FR (1) FR3026751B1 (en)
WO (1) WO2016051032A1 (en)

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Publication number Priority date Publication date Assignee Title
CN108301267B (en) * 2017-01-13 2020-07-28 绍兴华阳铁路器材有限公司 Novel hydraulic track lifting device with hydraulic booster
CN110640666B (en) * 2019-09-27 2021-03-30 佛山科学技术学院 Curing means for transportation
CN111702474A (en) * 2020-07-21 2020-09-25 江苏瑞力泰铁路科技有限公司 Novel intelligent single-rail screw machine

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
FR1206323A (en) * 1957-07-22 1960-02-09 Materiel Ind S A Et Const Meca Pulling machine
FR2745216B1 (en) * 1996-02-23 1998-05-22 Turripinoise De Mecanique Sa S MACHINE FOR SCREWING AND UNSCREWING BOLTS OR LOCKDRIVES

Non-Patent Citations (1)

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Title
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FR3026751B1 (en) 2016-11-25
FR3026751A1 (en) 2016-04-08
WO2016051032A1 (en) 2016-04-07
EP3200956A1 (en) 2017-08-09

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