WO1992017311A1 - Cylindre double integre de commande - Google Patents

Cylindre double integre de commande Download PDF

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Publication number
WO1992017311A1
WO1992017311A1 PCT/NL1992/000063 NL9200063W WO9217311A1 WO 1992017311 A1 WO1992017311 A1 WO 1992017311A1 NL 9200063 W NL9200063 W NL 9200063W WO 9217311 A1 WO9217311 A1 WO 9217311A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder
transport
piston
spot welding
pneumatic drive
Prior art date
Application number
PCT/NL1992/000063
Other languages
English (en)
Inventor
Marinus Willem Nugteren
Horst Kaldowski
Original Assignee
Machinefabriek Sempress B.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Machinefabriek Sempress B.V. filed Critical Machinefabriek Sempress B.V.
Publication of WO1992017311A1 publication Critical patent/WO1992017311A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes
    • B23K11/31—Electrode holders and actuating devices therefor

Definitions

  • the invention relates to a pneumatic drive cylin ⁇ der for a spot welding electrode, comprising a working cylinder.
  • Such pneumatic drive cylinders are generally known.
  • GB-A-1151775 which is provided with a working cylinder which is arranged to cause the spot welding electrode to move within a work region with a limited length, and a transport cylinder for causing the working cylinder to move from a rest position to a work region, wherein the transport cylinder encloses the working cylinder.
  • the circuit further comprises means to supply air to the spot welding cylinder, wherein this can take place at the same pressure or at a lowered pressure. In the latter case the air is guided for this purpose through a reducing valve.
  • the spot welding cylinder and the trans- port cylinder cannot be controlled independently of one another during the return movement, so that it is not possible to cause only the spot welding cylinder to return in order to have the spot welding cylinder already in the starting position for a following spot weld, with this known spot welding cylinder a complete return movement must be performed.
  • the object of the present invention is to provide such a spot welding cylinder wherein the advantages described in the preamble are obtained and wherein it is possible to cause an independent return movement of the spot welding cylinder to take place.
  • This object is achieved through a control device for controlling the supply and discharge of air indepen ⁇ dently of one another from and to the transport cylinder and the spot welding cylinder.
  • the integrated spot welding cylinder in low-noise embodiment has a reduced piston speed adapted to this purpose.
  • the integrated embodiment leads to reduction of dimensions and mass which is extremely important for use on rapidly moving welding robots, wherein the mass to be moved, in relation to mass forces, must remain as small as possible, partially with respect to reducing the cycle time.
  • the control device for controlling the air supply to the pneumatic cylinder is such that the force exerted by the transport cylinder is always greater than the force exerted by the working cylinder.
  • the position of the piston of the transport cylinder is fixed so that the forces created by the working cylinder can be apportioned well; in any case a fixed starting point is assumed.
  • fig. 3 shows a schematic sectional view of the cylinder depicted in fig. 1 wherein both pistons are si ⁇ tuated in a position moved wholly outward; and fig.4 shows a schematic perspective view of a second embodiment of the invention.
  • the cylinder shown in fig. 1 is formed by a jacket
  • a fixing eye 5 is fixed to the rear flange 2 by means of screws 4. Sealing between respectively the rear flange 2, the front flange 3 and the jacket 1 takes place by means of 0-rings 6 situated in a groove.
  • This piston 7 forms the piston of the transport cylinder.
  • a chamber 8 which is connected to a pneumatic line 10 by means of a channel 9.
  • the pneumatic line 10 is fixed to the rear flange 2 by means of a coupling 11.
  • a channel 12 which is in communication with a pneumatic line 13 which is fixed against the front flange 3 by means of a coupling 14.
  • the piston 7 is connected to a piston rod 15 which extends through an opening arranged in the front flange 3.
  • a seal is also arranged here so that the chamber to the right of the piston 7 remains sealed relative to the envi ⁇ ronment.
  • the construction of the piston 7 will now be further elucidated.
  • the piston 7 is formed by a jacket part 16 that is closed at its front side by a cover 17 and closed at its rear by a plate-like element 18.
  • two slide rings 19 Arranged on the inner wall of the jacket 1 to guide the piston 7 are two slide rings 19 which have a small friction coefficient on an outer side.
  • the jacket part 16 itself is not otherwise in contact with the inside of the jacket 1.
  • a groove 20 Arranged in the jacket part 16 for the purpose of sealing is a groove 20 in which a sealing body 21 is arranged.
  • two cylinder cavities 22, 23 are formed which are respectively closed on their front side by a cover 17 and the middle portion of the jacket part 16, and by the middle portion of the jacket part 16 and the plate-like body 18.
  • Respective cylinder linings 24 and 25 are arranged in both cylinder cavities 22, 23.
  • annular groove 26 and 27 Arranged in the head end surface of the cover 17 and the plate-like body 18 is an annular groove 26 and 27 respectively, in which a rubber ring 28, 29 respectively is arranged. Both rings 28, 29 serve as buffer to prevent the cover 17 or the plate-like body touching the front flange 3 or the rear flange 2. This would lead to contact of metal on metal and result in noise nuisance as well as unacceptable shock load.
  • Pistons 30 and 31 are arranged inside the respec- tive cylinder cavities 22, 23. Both pistons are connected to the piston rod 15. Sealing rings 32 and 33 are respec ⁇ tively arranged for sealing between the piston 30 and the cylinder lining 24, and between the piston 31 and the cylinder lining 25. An O-ring 34 is arranged for sealing of the piston rod 15 against the cover 17. Finally, two ta ⁇ rings 35 are arranged for sealing the thin portion of the piston rod 15 relative to the jacket part 16.
  • a pneumatic line 36 which debouches onto the rear flange 2 and which is fixed thereto, and which line 36 is connected to a channel 37.
  • the channel 37 is connected to an eccentrically arranged pipe 38 extending parallel to the piston rod 15.
  • This pipe 38 extends to a cavity 39 arranged in the jacket part 16, this along a length which varies with the movement of the piston 7.
  • the pipe 38 extends through the plate-like body 18 and is sealed against it. It is thus possible to supply air to the cavity 39 irrespective of the position of the piston 7.
  • the cavity 39 is connected by means of a channel 40 to the left-hand side of the cylinder cavity 23.
  • the cavity 23 is connected with a channel not shown in the drawing to the cavity 24 on the left-hand side of the piston 30.
  • the spaces on the other side of the pis- tons 30, 31 in the cylinder cavities 22, 23 are connected via a channel 36 via a cavity (not shown in the drawing) and a tube arranged therein to a pneumatic line likewise not shown in the drawing. It is thus possible to indepen ⁇ dently move the position of the respective pistons 30 and 31 in the piston 7.
  • the thus embodied drive cylinder is applied for a spot welding electrode, for example in the automobile industry.
  • the transport cylinder is energized so that the piston 7 moves to its outermost position.
  • the control of the air supply is controlled such that the piston 7 is fixed at the position reached.
  • a second embodiment of the invention is shown in fig. 4.
  • the cylinder construction of which corresponds with that of the preceding embodiments a control device 41 is arranged on the cylinder, which device controls the supply and discharge of air from and to the transport cylinder and the spot welding cylinder which are integrated in the cylinder jacket 1.
  • a position detecting device 42 is also arranged.
  • a mounting plate 43 Arranged on the rear flange 2 for fixing the control device 41 is a mounting plate 43 on which are arranged two controllable valves 44, 45. Both valves 44, 45 are connected to air supply and discharge openings in the rear flange 2 by means of channels (not shown in the drawing) arranged in the mounting plate 43.
  • the line 13 likewise leads to the mounting plate 43.
  • the first valve 44 is controlled by two electro ⁇ magnetic coils 46, 47 and the second valve is controlled by coils 48, 49.
  • a wire 51 extends from each of the coils via a coupling nut 50. These wires are connected to the electrical control device with which the position of the valves 44, 45 can be controlled.
  • an air supply line 52 is which is connected to the mounting plate 43 by means of a coupling nut 53.
  • An air discharge hose is arranged in corresponding manner on the other side.
  • On the mounting plate a number of sound dampers and filters 54 are further arranged in the central venting ports.
  • the position detecting device 42 comprises a lever
  • the approach switches 59, 60 are connected for example by means of wires 61, 62 to the control device for electrically controlling the magnets 46-49 and therefore the valves 44, 45 connected thereto. They are used to detect the position of the transport cylinder. It is for example possible that, when the ring 58 comes into the vicinity of the approach switch 60 during an outgoing movement of the piston rod 15, the air supply to the transport cylinder is cut off so that the movement of this transport cylinder is stopped. Use is made for this purpose of per se known electrical or electrotechnical circuits.
  • the spot welding cylinder In many cases, for example when the spot welding cylinder is fixed in a robot arm or other automated piece of tooling, the cylinder will be moved to a new position in order to perform a new spot weld. It will not be necessary for this purpose to energize the transport cylinder. A saving of time and compressed air is thus obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Resistance Welding (AREA)

Abstract

Cylindre pneumatique de commande pour électrode de soudage par points, comportant un cylindre de travail. Afin d'augmenter la maniabilité du cylindre de commande, le cylindre de travail est conçu pour déplacer l'électrode de soudage par points dans une zone de travail ayant une longueur limitée, et un cylindre transporteur sert à déplacer le cylindre de travail entre une position de repos et une zone de travail. Il est donc possible de couvrir la première partie de la course à une vitesse plus élevée, et de faire varier la force imprimée à la pièce en travail par ladite électrode, la durée du cycle pouvant ainsi être réduite. Selon un mode préféré de réalisation, le cylindre transporteur renferme le cylindre de commande, lequel constitue le piston dudit cylindre transporteur. Ceci entraîne une réduction de masse.
PCT/NL1992/000063 1991-04-05 1992-04-03 Cylindre double integre de commande WO1992017311A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9100595A NL9100595A (nl) 1991-04-05 1991-04-05 Geintegreerde dubbele aandrijfcilinder.
NL9100595 1991-04-05

Publications (1)

Publication Number Publication Date
WO1992017311A1 true WO1992017311A1 (fr) 1992-10-15

Family

ID=19859102

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1992/000063 WO1992017311A1 (fr) 1991-04-05 1992-04-03 Cylindre double integre de commande

Country Status (3)

Country Link
DE (1) DE9215263U1 (fr)
NL (1) NL9100595A (fr)
WO (1) WO1992017311A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715925A1 (fr) * 1994-12-10 1996-06-12 NIMAK Automatisierte Schweisstechnik GmbH Cylindre moteur pour un dispositif de soudage
US5623861A (en) * 1993-07-08 1997-04-29 Savair, Inc. Pneumatic cylinder and control valve therefor
WO1997017162A1 (fr) * 1995-11-03 1997-05-15 Dalex-Werke Niepenberg Gmbh & Co. Kg Procede et dispositif pour soudure par resistance
EP0914896A3 (fr) * 1997-10-25 1999-12-15 NIMAK Automatisierte Schweisstechnik GmbH Piston-cylindre pour pince de soudage
US6633015B2 (en) * 2000-12-08 2003-10-14 Doben Limited Soft-touch pneumatic drive unit
CN101837508A (zh) * 2010-04-27 2010-09-22 广州（从化）亨龙机电制造实业有限公司 一种悬挂焊机专用驱动缸

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4378627B2 (ja) * 2004-03-30 2009-12-09 Ｓｍｃ株式会社 エアサーボシリンダ
DE102006036271A1 (de) * 2006-08-03 2008-02-14 Festo Ag & Co. Antriebseinheit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151775A (en) * 1966-08-05 1969-05-14 Rubery Owen & Company Ltd Resistance Welding Equipment.
DE3612502A1 (de) * 1986-04-14 1987-10-15 Rema Schweisstechnik Pneumatisch betaetigbarer schweisszylinder mit vor- und arbeitshub
EP0373522A2 (fr) * 1988-12-12 1990-06-20 Kolben-Seeger GmbH & Co KG Cylindre de commande d'outil avec soupape de réglage
US5032704A (en) * 1990-08-22 1991-07-16 Mac Valves, Inc. Multi-pressure control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151775A (en) * 1966-08-05 1969-05-14 Rubery Owen & Company Ltd Resistance Welding Equipment.
DE3612502A1 (de) * 1986-04-14 1987-10-15 Rema Schweisstechnik Pneumatisch betaetigbarer schweisszylinder mit vor- und arbeitshub
EP0373522A2 (fr) * 1988-12-12 1990-06-20 Kolben-Seeger GmbH & Co KG Cylindre de commande d'outil avec soupape de réglage
US5032704A (en) * 1990-08-22 1991-07-16 Mac Valves, Inc. Multi-pressure control system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5623861A (en) * 1993-07-08 1997-04-29 Savair, Inc. Pneumatic cylinder and control valve therefor
EP0715925A1 (fr) * 1994-12-10 1996-06-12 NIMAK Automatisierte Schweisstechnik GmbH Cylindre moteur pour un dispositif de soudage
WO1997017162A1 (fr) * 1995-11-03 1997-05-15 Dalex-Werke Niepenberg Gmbh & Co. Kg Procede et dispositif pour soudure par resistance
EP0914896A3 (fr) * 1997-10-25 1999-12-15 NIMAK Automatisierte Schweisstechnik GmbH Piston-cylindre pour pince de soudage
US6633015B2 (en) * 2000-12-08 2003-10-14 Doben Limited Soft-touch pneumatic drive unit
CN101837508A (zh) * 2010-04-27 2010-09-22 广州（从化）亨龙机电制造实业有限公司 一种悬挂焊机专用驱动缸

Also Published As

Publication number Publication date
NL9100595A (nl) 1992-11-02
DE9215263U1 (de) 1992-12-24

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