EP1121997B1 - Machine automatique à rétreindre de tuyaux à transmission hydraulique - Google Patents

Machine automatique à rétreindre de tuyaux à transmission hydraulique Download PDF

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Publication number
EP1121997B1
EP1121997B1 EP01101576A EP01101576A EP1121997B1 EP 1121997 B1 EP1121997 B1 EP 1121997B1 EP 01101576 A EP01101576 A EP 01101576A EP 01101576 A EP01101576 A EP 01101576A EP 1121997 B1 EP1121997 B1 EP 1121997B1
Authority
EP
European Patent Office
Prior art keywords
chamber
auxiliary
pipe
cylinder
reservoir
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01101576A
Other languages
German (de)
English (en)
Other versions
EP1121997A1 (fr
Inventor
Giorgio Vezzani
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.)
C.B.C. S.P.A.
Original Assignee
Cbc SpA
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Filing date
Publication date
Application filed by Cbc SpA filed Critical Cbc SpA
Publication of EP1121997A1 publication Critical patent/EP1121997A1/fr
Application granted granted Critical
Publication of EP1121997B1 publication Critical patent/EP1121997B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/046—Connecting tubes to tube-like fittings

Definitions

  • This invention relates to a metal pipe swaging device, and in particular a pipe swaging device with hydraulic transmission.
  • connection can also be made by a coupling to which the two pipe pieces to be connected together are fixed in the aforesaid manner, these being mounted over it or inserted into it.
  • a swaging device with hydraulic transmission is described in EP-A-0908657, of the same proprietor as the present application, and comprises:
  • the rod is hollow to connect the first chamber to the second chamber and hence to the reservoir via the second conduit.
  • Communication between the first and second chamber is interrupted by said safety valve, disposed within the rod cavity and consisting of a ball valve maintained closed by the adjustable elastic reaction force of a relative precompressed spring.
  • the safety valve opens when the cylinder rod attains its maximum allowable projection, so avoiding unnecessary and dangerous overpressures.
  • the only limit on the pressure in the first chamber is that set by the safety valve, which however acts only when the rod has reached its end of travel, a situation which, in order to save time, an experienced operator does not normally allow to be reached, by intervening beforehand on said shut-off means (which in the embodiment illustrated in EP-A-09808657 are controlled by a simple handwheel operable manually by the operator) in order to interrupt the squeezing operation on the pipe when he considers that sufficient swaging has been achieved.
  • the object of the present invention is therefore to provide a swaging device with hydraulic transmission which enables proper swaging to be automatically achieved without operator intervention, so that the swaging operation becomes independent of operator ability or experience, and a new swaging cycle cannot be executed without the intervention of the operetor.
  • a pipe swaging device which enables a pipe to be automatically and correctly swaged without the operator having to do anything other than operate the pump of the device.
  • said valve means operate to open the shut-off means and hence cause the pressure in the first chamber to fall, so that the elastic piston return means return this latter into its initial position. Consequently the jaws of the pipe squeezing gripper are automatically released.
  • valve means of the swaging device according to the invention also operate as a safety valve, so that a specific safety valve as provided in EP-A-0908657 is no longer required.
  • valve means are adjustable in order to be able to adjust within a determined range the maximum desired value of the pressure of the incompressible liquid in the first chamber, i.e. the pressure at which said valve means open to allow discharge into the reservoir.
  • the pipe swaging device 10 illustrated in the figures is shown without the relative pipe squeezing gripper, for simplicity. This latter is however of conventional type, for example of the type represented and described in EP-A-0908657.
  • the device 10, as in the case of the pipe swaging device described in EP-A-0908657, comprises an operating means of electric motor type, shown only in part in Figure 1 for simplicity, and consisting basically of an electric drill 12 of gun type (i.e.
  • a handgrip not shown, similar to that of a gun
  • a train of gears 14, 16, 18 which transmit the rotary movement of the motor shaft pinion 20 of the drill 12 to a cam 22, the lateral surface of which engages a cam follower 24 provided with a helical return spring 26.
  • the cam follower 24 is integral with the end of a plunger 28 of a pump 30, the plunger 28 being movable in both directions within a relative cylinder 32.
  • first valve 38 When the plunger 28 descends, it causes the first valve 38 to open and a second unidirectional ball valve 40 to close, so that the liquid contained in the cylinder 32 of the pump 30 is fed through a first conduit 46, 48 to a first chamber 42 (shown in Figure 1 in its minimum volume condition) provided in a cylinder 44.
  • first chamber 42 shown in Figure 1 in its minimum volume condition
  • piston 54 Slidable in both directions within this latter, there is a piston 54 provided with an 0-ring 56 and integral with one end of a coaxial rod 52, the other end of which projects from the left end of the cylinder 44.
  • the piston 54 divides the interior of the cylinder 44 into two chambers, one of which is the aforesaid first chamber 42, the second chamber being indicated by 58 (represented in Figure 1 in its maximum volume condition).
  • the chambers 42 and 58 filled with the same incompressible liquid contained in the reservoir 34, have a variable volume which depends on the position of the piston 54, this position also determining the projection of the outer
  • the reservoir 34 has a deformable wall portion, which in this specific case consists of a cup-shaped elastic membrane 74 (for example of rubber or a suitable plastic material).
  • the edge of the membrane 74 is sealingly locked in position by a cover 76 having a number of through holes 78 so that atmospheric pressure acts on the outside of the membrane 74.
  • the membrane 74 allows compensation of the incompressible liquid volumes involved.
  • the first conduit 46, 48 communicates via auxiliary conduit portions 86 and 88 with a first auxiliary unidirectional ball valve 90, which enables the connection between the first conduit 46, 48 and the reservoir 34 to be interrupted, this connection being made via further conduit portions downstream of the first auxiliary valve 90 and which will be described hereinafter.
  • the first auxiliary valve is maintained closed by the action of a precompressed spring 92 which is chosen and set (by means of the screw 105 covered by the screw plug 103) such that this first auxiliary valve 90 opens when the pressure in the first chamber 42 (and hence in the first conduit 46, 48 and consequently in the auxiliary conduits 86, 88) reaches a value which ensures the required degree of squeezing of the pipe disposed between the jaws of the squeezing gripper.
  • the said pressure is transmitted downstream of the valve 90 via a conduit 94 and an aperture 96 which opens into a first auxiliary chamber 98 delimited by an auxiliary cylinder 99 and an auxiliary piston 100. This latter separates the first auxiliary chamber 98 from a second auxiliary chamber 101. From that face of the auxiliary piston 100 facing the second auxiliary chamber 101 there extends a coaxial pin 102 the purpose of which will be apparent hereinafter.
  • the reduction in pressure in the first chamber 42 of the cylinder 44 causes the piston 54 to return to its initial position (that shown in Figure 1) by the action of the helical spring 55. It also causes the first auxiliary valve 90 to close, so that pressurized liquid remains in the auxiliary conduit 94 and in the first auxiliary chamber 98, to maintain the auxiliary piston 100 in that position in which the shut-off valve 104 is open, this situation preventing the execution of a new swaging cycle but enabling the piston 54 to return.
  • a lever 110 operable by the operator which, when pressed, exerts a pressure on one end of a pin 112, to urge it inwards against the action of a helical return spring 118, so that the other end of the pin 112 opens a second auxiliary unidirectional ball valve 114 which interrupts communication between the first auxiliary chamber 98 and a second discharge conduit 116 (of which only the initial portion is seen in Figure 2) which opens into the reservoir 34. Opening the second auxiliary valve 114 causes the pressure of the liquid within the first auxiliary chamber 98 to fall, so that when the operator activates the pump 30, the shut-off valve 104 closes, to hence close communication between the first chamber 46, 48 and the first discharge conduit 108.
  • shut-off valve 104 In closing, the shut-off valve 104 hence urges the auxiliary piston 100 into its original position shown in Figure 2. Simultaneously the lever 110 also returns to its initial position by virtue of the return spring 118. The initial condition is hence completely restored, so that the device 10 is ready to effect a new pipe swaging operation.
  • the pump is driven by an electric motor (in this specific case that of a gun-type electric drill)
  • the pipe swaging device can also be non-motorized, in the sense that the pump drive means can be a conventional lever system which enables the operator to manually operate the pump by acting on a lever grippable by the operator.
  • the pump drive means can be a conventional lever system which enables the operator to manually operate the pump by acting on a lever grippable by the operator.
  • Such a manually operated variant is useful if a source of electrical energy is not available.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Refuse Collection And Transfer (AREA)
  • Forging (AREA)
  • Actuator (AREA)
  • Reciprocating Pumps (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Claims (10)

  1. Machine à rétreindre les tuyaux (10) dans laquelle la pince de serrage de tuyau est actionnée par transmission hydraulique, comprenant :
    un cylindre (44) à l'intérieur duquel une tige coaxiale (52) se déplace dans les deux sens, l'une de ses extrémités dépassant de façon étanche d'une extrémité du cylindre (44), un piston (54) pourvu de joints étant coaxialement fixé à l'autre extrémité de la tige (52), lequel piston (54) divise l'intérieur du cylindre (44) en une première chambre (42) et une seconde chambre (58) contenant toutes deux un liquide incompressible, l'extrémité qui dépasse de la tige (52) supportant un dispositif (80) d'actionnement de la pince de serrage de tuyau suivant l'augmentation de volume de la première chambre (42) ;
    un réservoir (34) contenant également ledit liquide incompressible, l'enveloppe du réservoir (34) étant en partie (74) élastiquement déformable, dans une limite définie, en fonction de la variation de la quantité de liquide présent dans le réservoir (34) ;
    une pompe à piston (30) pour puiser le liquide contenu dans le réservoir (34) et l'envoyer sous pression dans ladite première chambre (42) du cylindre (44) via un premier conduit (46, 48) ;
    un deuxième conduit (72) qui relie la seconde chambre (58) du cylindre (44) au réservoir (34) ;
    un troisième conduit (48, 108) qui relie la première chambre (42) au réservoir (34) sans passer par la pompe (30) ;
    un dispositif d'obturation (104) pour obturer le troisième conduit (48, 108) ;
    un dispositif de rappel élastique pour ramener la tige (52) dans la position correspondant au volume minimum de la première chambre (42) du cylindre (44) lorsque le dispositif d'obturation (104) du troisième conduit (48, 108) est ouvert ;
        caractérisée en ce qu'elle comprend un dispositif à soupape (90, 99, 100, 102) pour ouvrir automatiquement le dispositif d'obturation (104) afin de permettre l'évacuation vers le réservoir (34) du liquide incompressible présent dans la première chambre (42) lorsqu'une pression prédéterminée correspondant au degré de serrage requis du tuyau est atteinte dans la première chambre (42), le dispositif à soupape comprenant une première soupape auxiliaire (90) qui s'ouvre lorsque la pression à l'intérieur de la première chambre (42) du cylindre (44) atteint la valeur souhaitée, l'ouverture de ladite première soupape auxiliaire (90) mettant sous pression une première chambre auxiliaire (98) d'un cylindre auxiliaire (99) à l'intérieur duquel peut glisser dans les deux sens un piston auxiliaire (100) qui sépare la première chambre auxiliaire (98) du cylindre auxiliaire (99) d'une seconde chambre auxiliaire (101) reliée au réservoir (34) et, via ledit dispositif d'obturation (104), à la première chambre (42) du cylindre (44), le dispositif d'obturation (104) étant fermé lorsque la première chambre (42) du cylindre (44) est sous pression, la première chambre auxiliaire (98) étant reliée au réservoir (34) via une seconde soupape auxiliaire (114), la seconde soupape auxiliaire (114) étant fermée lorsque la première chambre auxiliaire (98) est sous pression, le piston auxiliaire (100) étant doté d'un dispositif (102) qui permet l'ouverture du dispositif d'obturation (104) lorsque la première chambre auxiliaire (98) est sous pression ; un dispositif (110, 112) pouvant être actionné par l'opérateur étant prévu pour ouvrir la seconde soupape auxiliaire (114) et, partant, pour restaurer l'état initial.
  2. Machine à rétreindre les tuyaux (10) selon la revendication 1, caractérisée en ce que le dispositif à soupape (90, 99, 100, 102) est réglable.
  3. Machine à rétreindre les tuyaux (10) selon la revendication 1, caractérisée en ce que la seconde soupape auxiliaire est un clapet à bille unidirectionnel (114), le dispositif pouvant être actionné par l'opérateur pour ouvrir la seconde soupape auxiliaire (114) comportant un doigt (112) mobile de façon étanche dans les deux sens dans un logement correspondant, le doigt (112) pouvant être poussé vers l'intérieur par l'opérateur à l'encontre de l'action du dispositif de rappel élastique (118) afin d'ouvrir la seconde soupape auxiliaire (114) et de permettre ainsi l'évacuation vers le réservoir (34) du liquide sous pression contenu dans la première chambre auxiliaire (98).
  4. Machine à rétreindre les tuyaux (10) selon la revendication 3, caractérisée en ce que le dispositif pouvant être actionné par l'opérateur pour ouvrir la seconde soupape auxiliaire (114) comporte une gâchette (110) permettant à l'opérateur de presser le doigt (112) vers l'intérieur.
  5. Machine à rétreindre les tuyaux (10) selon la revendication 1, caractérisée en ce que les première (90) et seconde (114) soupapes auxiliaires ainsi que le dispositif d'obturation (104) sont des clapets à bille unidirectionnels.
  6. Machine à rétreindre les tuyaux (10) selon la revendication 1, caractérisée en ce que la partie élastiquement déformable de la paroi du réservoir (34) est une membrane élastique (74).
  7. Machine à rétreindre les tuyaux (10) selon la revendication 1, caractérisée en ce que la pompe est actionnée manuellement.
  8. Machine à rétreindre les tuyaux (10) selon la revendication 1, caractérisée en ce que le dispositif d'actionnement de la pompe (30) est un moteur électrique.
  9. Machine à rétreindre les tuyaux (10) selon la revendication 8, caractérisée en ce que le moteur électrique fait partie d'une perceuse électrique (12) de type pistolet, le mandrin ayant été retiré de la perceuse (12) et remplacé par un train d'engrenages (20, 14, 16, 18) qui transmet le mouvement rotatif de l'axe du moteur de la perceuse (12) à une came (22) dont la périphérie coopère en appui avec un poussoir (24) en liaison rigide avec l'extrémité externe de la tige de la pompe (30) à piston (28).
  10. Machine à rétreindre les tuyaux (10) selon la revendication 1, caractérisée en ce que la pince de serrage de tuyau est actionnée par deux galets (80) libres coplanaires montés sur l'extrémité qui dépasse de la tige (52) et disposés entre les deux bras d'une fourche (84).
EP01101576A 2000-02-07 2001-01-25 Machine automatique à rétreindre de tuyaux à transmission hydraulique Expired - Lifetime EP1121997B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI000191 2000-02-07
IT2000MI000191A IT1316351B1 (it) 2000-02-07 2000-02-07 Dispositivo strozzatubi a trasmissione idraulica automatico

Publications (2)

Publication Number Publication Date
EP1121997A1 EP1121997A1 (fr) 2001-08-08
EP1121997B1 true EP1121997B1 (fr) 2002-07-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01101576A Expired - Lifetime EP1121997B1 (fr) 2000-02-07 2001-01-25 Machine automatique à rétreindre de tuyaux à transmission hydraulique

Country Status (5)

Country Link
EP (1) EP1121997B1 (fr)
AT (1) ATE219975T1 (fr)
DE (1) DE60100002T2 (fr)
ES (1) ES2176171T3 (fr)
IT (1) IT1316351B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104191413A (zh) * 2014-08-19 2014-12-10 中国北方车辆研究所 一种液力减速器挡片装配机构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20120204U1 (de) 2001-12-13 2003-04-17 Gustav Klauke GmbH, 42855 Remscheid Hydraulisches Verpressgerät
DE20303877U1 (de) 2003-03-10 2003-05-08 Novopress GmbH Pressen und Presswerkzeuge & Co KG, 41460 Neuss Handgeführtes Preßgerät

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1295321B1 (it) * 1997-10-13 1999-05-04 Cbc Spa Dispositivo strozzatubi a trasmissione idraulica
DE19825160A1 (de) * 1997-10-15 1999-04-22 Klauke Gmbh Gustav Hydraulisches Preßgerät und Verfahren zum Betreiben desselben

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104191413A (zh) * 2014-08-19 2014-12-10 中国北方车辆研究所 一种液力减速器挡片装配机构
CN104191413B (zh) * 2014-08-19 2016-04-06 中国北方车辆研究所 一种液力减速器挡片装配机构

Also Published As

Publication number Publication date
DE60100002D1 (de) 2002-08-08
ITMI20000191A1 (it) 2001-08-07
IT1316351B1 (it) 2003-04-10
DE60100002T2 (de) 2002-10-31
ITMI20000191A0 (it) 2000-02-07
ES2176171T3 (es) 2002-12-01
ATE219975T1 (de) 2002-07-15
EP1121997A1 (fr) 2001-08-08

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