EP1121997B1 - Automatisches Rohrverpressgerät mit hydraulischem Antrieb - Google Patents

Automatisches Rohrverpressgerät mit hydraulischem Antrieb 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
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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
English (en)
French (fr)
Other versions
EP1121997A1 (de
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/de
Application granted granted Critical
Publication of EP1121997B1 publication Critical patent/EP1121997B1/de
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)
  • Reciprocating Pumps (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Actuator (AREA)

Claims (10)

  1. Rohrverpressungsgerät (10), in dem der Rohrpressgreifer durch ein hydraulisches Getriebe betätigt wird, umfassend: einen Zylinder (44), innerhalb dessen eine koaxiale Stange (52) in beide Richtungen bewegbar ist, wobei eines ihrer Enden von einem Ende des Zylinders (44) abgedichtet hervorsteht, wobei an dem anderen Ende der Stange (52) ein abgedichteter Kolben (54) koaxial befestigt ist, welcher das Innere des Zylinders (44) in eine erste (42) und eine zweite (58) Kammer unterteilt, welche beide eine inkompressible Flüssigkeit beinhalten, wobei das hervorstehende Ende der Stange (52) Mittel (80) zum Betätigen des Rohrpressgreifers infolge einer Volumenerhöhung in der ersten Kammer (42) trägt;
    einen ebenfalls die inkompressible Flüssigkeit beinhaltenden Behälter (34), wobei die Hülle des Behälters (34) teilweise (74) innerhalb bestimmter Grenzen infolge einer Veränderung der in dem Behälter (34) vorhandenen Flüssigkeitsmenge elastisch verformbar ist;
    eine Plungerpumpe (30) zum Abführen der in dem Behälter (34) enthaltenen Flüssigkeit und zum Zuführen der Flüssigkeit unter Druck über eine erste Leitung (46,48) in die erste Kammer (42) des Zylinders (44);
    eine zweite Leitung (72), welche die zweite Kammer (58) des Zylinders (44) mit dem Behälter (34) verbindet;
    eine dritte Leitung (48,108), welche die erste Kammer (42) unter Umgehung der Pumpe (30) mit dem Behälter (34) verbindet;
    Verschlussmittel (104) zur Unterbrechung der dritten Leitung (48,108);
    elastische Rückstellmittel zum Bewegen der Stange (52) in die einem minimalen Volumen der ersten Kammer (42) des Zylinders (44) entsprechende Position, wenn die Verschlussmittel (104) in der dritten Leitung (48,108) offen sind;
    gekennzeichnet durch
    Ventilmittel (90,99,100,102) zum automatischen Öffnen der Verschlussmittel (104), um ein Entladen der in der ersten Kammer (42) enthaltenen inkompressiblen Flüssigkeit in den Behälter (34) zu ermöglichen, wenn ein dem erforderlichen Rohrpressgrad entsprechender bestimmter Druck in der ersten Kammer (42) erreicht worden ist,
    wobei die Ventilmittel ein erstes Hilfsventil (90) umfassen, welches geöffnet wird, wenn der Druck in der ersten Kammer (42) des Zylinders (44) den gewünschten Wert erreicht, wobei die Öffnung des ersten Hilfsventils (90) eine erste Hilfskammer (98) eines Hilfszylinders (99) unter Druck setzt, wobei innerhalb des Hilfszylinders ein Hilfskolben (100) in die beiden Richtungen gleiten kann, welcher die erste Hilfskammer (98) des Hilfszylinders (99) von einer zweiten Hilfskammer (101), die mit dem Behälter (34) und über die Verschlussmittel (104) mit der ersten Kammer (42) des Zylinders (44) in Verbindung steht, abtrennt, wobei die Verschlussmittel (104) geschlossen werden, wenn die erste Kammer (42) des Zylinders (44) unter Druck steht, wobei die erste Hilfskammer (98) mit dem Behälter (34) über ein zweites Hilfsventil (114) in Verbindung steht, wobei das zweite Hilfsventil (114) geschlossen wird, wenn die erste Hilfskammer (98) unter Druck steht, wobei der Hilfskolben (100) Mittel (102) aufweist, welche ein Öffnen der Verschlussmittel (104) ermöglichen, wenn die erste Hilfskammer (98) unter Druck steht;
    Mittel (110,112), welche durch die Bedienperson betätigbar sind und zum Öffnen des zweiten Hilfsventils (114) vorgesehen sind, um somit den Ausgangszustand wiederherzustellen.
  2. Rohrverpressungsgerät (10) nach Anspruch 1, wobei die Ventilmittel (90,99,100,102) einstellbar sind.
  3. Rohrverpressungsgerät (10) nach Anspruch 1, wobei das zweite Hilfsventil ein unidirektionales Kugelventil (114) ist, wobei die durch die Bedienperson betätigbaren Mittel zum Öffnen des zweiten Hilfsventils (114) einen Stift (112) umfassen, welcher innerhalb einer relativen Lagerung in die beiden Richtungen abgedichtet bewegbar ist, wobei der Stift (112) von der Bedienperson gegen die Wirkung der elastischen Rückstellmittel (118) nach innen getrieben werden kann, um das zweite Hilfsventil (114) zu öffnen und somit eine Entladung der unter Druck stehenden und in der ersten Hilfskammer (98) enthaltenen Flüssigkeit in den Behälter (34) zu ermöglichen.
  4. Rohrverpressungsgerät (10) nach Anspruch 3, wobei die von der Bedienperson betätigbaren Mittel zum Öffnen des zweiten Hilfsventils (114) einen Hebel (110) umfassen, welcher der Bedienperson das nach innen Drücken des Stifts (112) ermöglicht.
  5. Rohrverpressungsgerät (10) nach Anspruch 1, wobei das erste (98) und das zweite (114) Hilfsventil und die Rückstellmittel (104) unidirektionale Kugelventile sind.
  6. Rohrverpressungsgerät (10) nach Anspruch 1, wobei der elastisch verformbare Wandabschnitt des Behälters (34) eine elastische Membran (74) ist.
  7. Rohrverpressungsgerät (10) nach Anspruch 1, wobei das Pumpenbetätigungsmittel manuell ausgestaltet ist.
  8. Rohrverpressungsgerät (10) nach Anspruch 1, wobei das Betätigungsmittel für die Pumpe (30) ein Elektromotor ist.
  9. Rohrverpressungsgerät (10) nach Anspruch 8, wobei der Elektromotor Teil eines elektrischen Tiefbohrers (12) ist, wobei das Spannfutter von dem Bohrer (12) entfernt und durch ein Getriebewerk (20,14,16,18) ersetzt worden ist, welches die Drehbewegung der Motorwelle des Bohrers (12) auf eine Nocke (22) überträgt, deren Peripherie mit einem Nockenstößel (24) in Eingriff steht, welcher mit dem äußeren Ende der Stange der Planscherpumpe (28,30) fest verbunden ist.
  10. Rohrverpressungsgerät (10) nach Anspruch 1, wobei der Rohrpressgreifer durch zwei koplanare nichtangetriebene Rollen (80) betätigt wird, welche an dem hervorstehenden Ende der Stange (52) angebracht und zwischen den beiden Zweigen einer Gabel (84) angeordnet sind.
EP01101576A 2000-02-07 2001-01-25 Automatisches Rohrverpressgerät mit hydraulischem Antrieb Expired - Lifetime EP1121997B1 (de)

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 (de) 2001-08-08
EP1121997B1 true EP1121997B1 (de) 2002-07-03

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EP01101576A Expired - Lifetime EP1121997B1 (de) 2000-02-07 2001-01-25 Automatisches Rohrverpressgerät mit hydraulischem Antrieb

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EP (1) EP1121997B1 (de)
AT (1) ATE219975T1 (de)
DE (1) DE60100002T2 (de)
ES (1) ES2176171T3 (de)
IT (1) IT1316351B1 (de)

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

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