EP2776300B1 - Sand dispenser for preventing train wheels from skidding - Google Patents

Sand dispenser for preventing train wheels from skidding Download PDF

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Publication number
EP2776300B1
EP2776300B1 EP11761098.0A EP11761098A EP2776300B1 EP 2776300 B1 EP2776300 B1 EP 2776300B1 EP 11761098 A EP11761098 A EP 11761098A EP 2776300 B1 EP2776300 B1 EP 2776300B1
Authority
EP
European Patent Office
Prior art keywords
sand
piston
tank
dispenser
compressed air
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.)
Not-in-force
Application number
EP11761098.0A
Other languages
German (de)
French (fr)
Other versions
EP2776300A1 (en
Inventor
Willy Del Barba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DEL BARBA, WILLY
Original Assignee
Individual
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Filing date
Publication date
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Publication of EP2776300A1 publication Critical patent/EP2776300A1/en
Application granted granted Critical
Publication of EP2776300B1 publication Critical patent/EP2776300B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61C—LOCOMOTIVES; MOTOR RAILCARS
    • B61C15/00—Maintaining or augmenting the starting or braking power by auxiliary devices and measures; Preventing wheel slippage; Controlling distribution of tractive effort between driving wheels
    • B61C15/08—Preventing wheel slippage
    • B61C15/10—Preventing wheel slippage by depositing sand or like friction increasing materials
    • B61C15/102—Preventing wheel slippage by depositing sand or like friction increasing materials with sanding equipment of mechanical or fluid type, e.g. by means of steam

Definitions

  • the present invention relates to a machine which makes it possible to distribute the sand from the sand pits mounted on the trains, on the railroad tracks, in order to restore grip when braking and accelerating the wheels on the rails.
  • the document GB-A-857,246 shows a sand distributor comprising a bell embedded in a sand tank fixed under the body of a train and a piston made up of two discs between which is trapped a determined quantity of sand during the movement of the piston, an opening made in the bell allowing the passage of sand from the reservoir into the volume located between the two discs, the piston ensuring in its downward movement the transport of the sand to an opening located below the reservoir and upstream of the distributor.
  • the sand dispenser having the characteristics of claim 1 is an improvement of known machines and aims at the advantages listed at the end of the description.
  • This machine uses a cyclic sand dosing system, in order to be able to easily control the flow of sand which must be spread on the rails before the wheels pass.
  • This machine makes it possible to transfer the sand contained in the sand tank into an intermediate chamber located in the lower part of the distributor; simultaneously, compressed air projects this quantity of sand into the duct which conveys the latter on the rail.
  • This machine makes it possible to completely isolate the enclosure of the sand tank, from the outlet of the distributor, in the two phases, rest and work.
  • This machine also generates vibrations due to the translation of the metering pistons, this vibration is important, it allows to fluidize and unclog the sand contained in the tank.
  • This sand dispenser is carried out by the compressed air of the train; it can also be controlled by an electrical source.
  • the sand flow is directly proportional to the compressed air supply pressure or to the timing of the electrical pulses in the case of the electrical supply.
  • the distribution of sand consists of: A sand tank (1) which retains the sand, the latter is fixed under the body of the train; the sand (2) is directed towards the center at the bottom of the tank by means of a cylindrical-conical shape, the sand distributor (3) is fixed under this tank.
  • a compressed air supply from the train (4) supplies the sand distributor, a flexible (5) attached to the sand distributor conveys the latter on the rail near the axle wheel.
  • a bell (10) belonging to the sand distributor is embedded in the sand tank (2), it reduces the sand thrust downwards, it is equipped with fins in the upper part to transmit vibrations to the sand when the distributor is operational and it also has the function of limiting the flow of sand through the throttle (15).
  • a piston (7) is equipped with two cylindrical rubber seals (6), it is controlled by a compressed air piston (11) which performs a linear reciprocating movement from top to bottom.
  • the linear displacement of the piston allows with its two seals to trap a defined quantity of sand, by the volume separating the two seals.
  • a deformable synthetic washer characterized by a larger diameter than the connection orifice of the reservoir makes it possible, during the dismantling of the lower part of the distributor, to block the fall of the sand during the maintenance of the latter.
  • the compressed air (4) pushes this quantity of sand into the hose and carries it on the rail.
  • This invention results in the following main advantages: This machine makes it possible to prevent any rising humidity in the tank in the two phases, operation and rest.
  • This machine allows to precisely dose the amount of sand Spread out on the rail.
  • This machine makes it possible to generate vibrations during operation which significantly increase the flowability of the sand when filling the dispenser.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Jigging Conveyors (AREA)

Description

La présente invention concerne une machine qui permet de distribuer le sable des sablières montés sur les trains, sur les rails de chemin de fer ceci afin de redonner de l'adhérence au freinage et à l'accélération des roues sur les rails.The present invention relates to a machine which makes it possible to distribute the sand from the sand pits mounted on the trains, on the railroad tracks, in order to restore grip when braking and accelerating the wheels on the rails.

Le document GB-A-857,246 montre un distributeur de sable comprenant une cloche noyée dans un réservoir de sable fixé sous la caisse d'un train et un piston constitué de deux disques entre lesquels est emprisonnée une quantité déterminée de sable lors du déplacement du piston, une ouverture aménagée dans la cloche permettant le passage du sable depuis le réservoir dans le volume situé entre les deux disques, le piston assurant dans son déplacement vers le bas le transport du sable vers une ouverture située en dessous du réservoir et en amont du distributeur.The document GB-A-857,246 shows a sand distributor comprising a bell embedded in a sand tank fixed under the body of a train and a piston made up of two discs between which is trapped a determined quantity of sand during the movement of the piston, an opening made in the bell allowing the passage of sand from the reservoir into the volume located between the two discs, the piston ensuring in its downward movement the transport of the sand to an opening located below the reservoir and upstream of the distributor.

Le distributeur de sable ayant les caractéristiques de la revendication 1 se propose une amélioration des machines connues et vise les avantages énumérés en fin de description.The sand dispenser having the characteristics of claim 1 is an improvement of known machines and aims at the advantages listed at the end of the description.

Cette machine fait appel à un système de dosage cyclique du sable, ceci afin de pour pouvoir contrôler facilement le débit de sable qui doit être étalé sur les rails avant passage des roues.This machine uses a cyclic sand dosing system, in order to be able to easily control the flow of sand which must be spread on the rails before the wheels pass.

Cette machine permet de transvaser le sable contenu dans le réservoir de sable dans une chambre intermédiaire située en partie basse du distributeur ; simultanément, de l'air comprimé projette cette quantité de sable dans le conduit qui achemine ce dernier sur le rail.This machine makes it possible to transfer the sand contained in the sand tank into an intermediate chamber located in the lower part of the distributor; simultaneously, compressed air projects this quantity of sand into the duct which conveys the latter on the rail.

Cette machine permet d'isoler complètement l'enceinte du réservoir de sable, de la sortie du distributeur et ce dans les deux phases, repos et travail.This machine makes it possible to completely isolate the enclosure of the sand tank, from the outlet of the distributor, in the two phases, rest and work.

Cette machine de plus génère des vibrations dues à la translation des pistons de dosages, cette vibration est importante, elle permet de fluidiser et de décolmater le sable contenu dans le réservoir.This machine also generates vibrations due to the translation of the metering pistons, this vibration is important, it allows to fluidize and unclog the sand contained in the tank.

La commande de ce doseur de sable est effectuée par l'air comprimé du train ; elle peut être aussi commandée par une source électrique.The control of this sand dispenser is carried out by the compressed air of the train; it can also be controlled by an electrical source.

Le débit de sable est directement proportionnel à la pression d'alimentation en air comprimé ou à la temporisation des impulsions électriques dans le cas de l'alimentation électrique.The sand flow is directly proportional to the compressed air supply pressure or to the timing of the electrical pulses in the case of the electrical supply.

En figure 1, la distribution de sable est constituée de :
Un réservoir de sable (1) qui retient le sable, ce dernier est fixé sous la caisse du train ; le sable (2) est dirigé vers le centre en bas du réservoir par l'intermédiaire d'une forme cylindro-conique, le distributeur de sable (3) est fixé sous ce réservoir. une arrivée d'air comprimé du train (4) alimente le distributeur de sable, un flexible (5) fixée sur le distributeur de sable achemine ce dernier sur le rail à proximité de la roue de l'essieux.In figure 1 , the distribution of sand consists of:
A sand tank (1) which retains the sand, the latter is fixed under the body of the train; the sand (2) is directed towards the center at the bottom of the tank by means of a cylindrical-conical shape, the sand distributor (3) is fixed under this tank. a compressed air supply from the train (4) supplies the sand distributor, a flexible (5) attached to the sand distributor conveys the latter on the rail near the axle wheel.

En figure 2, le fonctionnement du distributeur est le suivant :
Une cloche (10) appartenant au distributeur de sable est noyée dans le réservoir de sable (2) , elle permet de réduire la poussée de sable vers la bas, elle est équipée d'ailettes en partie supérieur pour transmettre les vibrations au sable lorsque le distributeur est fonctionnant et elle a aussi pour fonction de limiter le débit du sable par l'intermédiaire de l'étranglement (15).In figure 2 , the operation of the distributor is as follows:
A bell (10) belonging to the sand distributor is embedded in the sand tank (2), it reduces the sand thrust downwards, it is equipped with fins in the upper part to transmit vibrations to the sand when the distributor is operational and it also has the function of limiting the flow of sand through the throttle (15).

Un piston (7) est équipé de deux joints cylindriques en caoutchouc (6), il est commandé par un piston d'air comprimé (11) qui effectue un mouvement alternatif linéaire de haut en bas.A piston (7) is equipped with two cylindrical rubber seals (6), it is controlled by a compressed air piston (11) which performs a linear reciprocating movement from top to bottom.

Le déplacement linéaire du piston permet avec ses deux joints d'emprisonner une quantité définie de sable, par le volume séparant les deux joints.The linear displacement of the piston allows with its two seals to trap a defined quantity of sand, by the volume separating the two seals.

Une rondelle synthétique déformable caractérisée par un diamètre plus grand que l'orifice de raccordement du réservoir permet, lors du démontage de la partie inférieure du distributeur, de bloquer la chute du sable lors de l'entretien de ce dernier.A deformable synthetic washer characterized by a larger diameter than the connection orifice of the reservoir makes it possible, during the dismantling of the lower part of the distributor, to block the fall of the sand during the maintenance of the latter.

En figure 3 :
Le piston (7) se déplace vers le bas, à ce niveau la cavité (16) est séparé du réservoir de sable, elle transfert cette quantité de sable vers le bas tout en isolant le réservoir de sable de la parie inférieure du distributeur qui est En correspondance avec l'air extérieur à travers le tuyau flexible (5).In figure 3 :
The piston (7) moves downwards, at this level the cavity (16) is separated from the sand tank, it transfers this quantity of sand downwards while isolating the sand tank from the lower part of the distributor which is In correspondence with the outside air through the flexible pipe (5).

En figure 4 :
Le piston (7) continuant à descendre, ouvre la cavité (16) et permet au sable contenu dans cette dernière de tomber dans le volume (14); à ce niveau le sable contenu dans le réservoir est toujours isolé.In figure 4 :
The piston (7) continuing to descend, opens the cavity (16) and allows the sand contained in the latter to fall into the volume (14); at this level the sand contained in the tank is still isolated.

L'air comprimé (4) pousse cette quantité de sable dans le flexible et l'achemine sur le rail.The compressed air (4) pushes this quantity of sand into the hose and carries it on the rail.

De cette invention découle les principaux avantages suivants :
Cette machine permet d'éviter toute remonté d'humidité dans le réservoir dans les deux phases, fonctionnement et repos.This invention results in the following main advantages:
This machine makes it possible to prevent any rising humidity in the tank in the two phases, operation and rest.

Cette machine permet de doser d'une manière précise la quantité de sable Etalée sur le rail.This machine allows to precisely dose the amount of sand Spread out on the rail.

Cette machine permet de générer des vibrations pendant le fonctionnement qui augmentent d'une façon significative la coulabilité du Sable lors du remplissage du distributeur.This machine makes it possible to generate vibrations during operation which significantly increase the flowability of the sand when filling the dispenser.

Claims (3)

  1. Sand dispenser for preventing train wheels from skidding, comprising a bell (10) designed to be embedded in a sand tank (1) attached under the body of the train and a piston (7) capable of performing an alternating up-and-down linear movement under the effect of a stream of compressed air, this piston consisting of two coaxial cylindrical seals (6) delimiting between their respective ends a ring-shaped volume in which a defined quantity of sand is trapped during the linear movement of the piston (7), a bottleneck (15) built into the bell allowing the passage of the sand from the tank (1) through to said volume when the piston (7) is in the high position, the piston transporting the sand contained in the volume in its downward movement into a cavity (16) located below the tank (1) and upstream from the dispenser, where a first compressed air source projects the sand onto the rail.
  2. Sand dispenser according to claim 1, characterised in that the piston (7) is controlled by a compressed air piston (11) which is completely isolated from the chamber in which the sand circulates and hermetically sealed, and therefore protected from the air and sand dust.
  3. Sand dispenser according to any one of claims 1 and 2 characterised in that the bell (10) is equipped with fins at the top, so as to transmit the vibrations to the sand contained in the sand tank of the locomotive when the dispenser is operating and thus unclog the sand.
EP11761098.0A 2011-09-08 2011-09-08 Sand dispenser for preventing train wheels from skidding Not-in-force EP2776300B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR2011/000494 WO2013034816A1 (en) 2011-09-08 2011-09-08 Sand dispenser for preventing train wheels from skidding

Publications (2)

Publication Number Publication Date
EP2776300A1 EP2776300A1 (en) 2014-09-17
EP2776300B1 true EP2776300B1 (en) 2021-02-17

Family

ID=44677960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11761098.0A Not-in-force EP2776300B1 (en) 2011-09-08 2011-09-08 Sand dispenser for preventing train wheels from skidding

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EP (1) EP2776300B1 (en)
WO (1) WO2013034816A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10029703B2 (en) 2014-06-10 2018-07-24 Microsistemi S.R.L. Sandbox for rail vehicles
CN104787059A (en) * 2014-11-28 2015-07-22 南车青岛四方机车车辆股份有限公司 Sanding device installed on headstock and tramcar
CN109017829B (en) * 2018-07-26 2020-02-11 株洲电力机车电机修造有限公司 Sand sprayer for locomotive
CN109910924B (en) * 2019-04-18 2024-02-02 华铁西屋法维莱(青岛)交通设备有限公司 Hardening-preventing sand spreading device for rail transit

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE332439C (en) * 1920-02-07 1921-01-31 Heinrich Glahe Sand spreader
FR593382A (en) * 1925-02-11 1925-08-21 Compressed air operated sand pit for all vehicles on rail or not
US2155214A (en) * 1937-11-24 1939-04-18 Westinghouse Air Brake Co Rail sanding device
GB857246A (en) * 1957-09-23 1960-12-29 Gresham & Craven Ltd Improvements in and relating to railway vehicles
FR2713182B1 (en) * 1993-12-01 1996-02-02 Belles Ondes Forges Sandblaster comprising a container containing a granular material, in particular sand, associated with a driving wheel.
DE29721340U1 (en) * 1997-12-03 1998-02-26 Füßmann, Dieter, 45711 Datteln Sand dosing device for rail vehicles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP2776300A1 (en) 2014-09-17
WO2013034816A1 (en) 2013-03-14

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