EP0914896A2 - Piston-cylindre pour pince de soudage - Google Patents

Piston-cylindre pour pince de soudage Download PDF

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Publication number
EP0914896A2
EP0914896A2 EP98119668A EP98119668A EP0914896A2 EP 0914896 A2 EP0914896 A2 EP 0914896A2 EP 98119668 A EP98119668 A EP 98119668A EP 98119668 A EP98119668 A EP 98119668A EP 0914896 A2 EP0914896 A2 EP 0914896A2
Authority
EP
European Patent Office
Prior art keywords
piston
pressure chamber
stroke
cylinder
pressure
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.)
Withdrawn
Application number
EP98119668A
Other languages
German (de)
English (en)
Other versions
EP0914896A3 (fr
Inventor
Paul Gerhard Nickel
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.)
NIMAK Automatisierte Schweisstechnik GmbH
Original Assignee
NIMAK Automatisierte Schweisstechnik GmbH
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 NIMAK Automatisierte Schweisstechnik GmbH filed Critical NIMAK Automatisierte Schweisstechnik GmbH
Publication of EP0914896A2 publication Critical patent/EP0914896A2/fr
Publication of EP0914896A3 publication Critical patent/EP0914896A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers

Definitions

  • the present invention relates to a piston-cylinder arrangement to carry out a double stroke (preliminary stroke, working stroke), especially for driving a welding electrode a welding gun consisting of a cylinder, an in the pre-stroke hollow piston guided in the cylinder, and an in the preliminary stroke hollow piston, with a piston rod connected working piston, being between the preliminary stroke hollow piston and a cylinder head a first pressure chamber, between the forward stroke cabbage piston and the working piston second pressure chamber and between that from the working piston and the pre-stroke cabbage piston formed piston assembly and a third cylinder bottom enclosing the piston rod Pressure room is formed and the pressure rooms optionally can be acted upon with a pressure medium, in particular compressed air are, namely the first pressure chamber for executing the Forward stroke of the preliminary stroke hollow piston, the second pressure chamber for Execution of the working stroke of the working piston and the third pressure chamber for at least one return stroke of the pistons.
  • Such a piston-cylinder arrangement is, for example known from German utility model DE 94 19 815 U1 and has proven itself in practice. It serves at Spot welding devices, the so-called spot welding electrodes Welding guns, closing and opening, being the entire cylinder unit, the welding gun cylinder, - usually through a robot arm - on the respective one Welding spot is moved.
  • the cylinder is rigid with the an electrode connected during the piston assembly
  • the movable electrode is actuated via a piston rod.
  • the robot gun body is made of high-strength aluminum plates, on modern CNC-controlled processing machines can be produced according to the modular system assembled.
  • this is usually the total movement stroke of the movable electrode in at least divided two areas, namely a preliminary stroke to the welding device first in the welding area of the to position and partially close the respective workpiece to be able to, and a quite small compared to the preliminary stroke Working stroke in which the actual welding processes take place.
  • a valve arrangement provided over which the pressure chambers of the piston-cylinder arrangement controlled with pressure medium, in particular with compressed air.
  • the invention has for its object a piston-cylinder arrangement of the type described in the introduction, with the one without an additional vent valve higher working speed can be achieved.
  • this is achieved by a piston-cylinder arrangement of the type described at the outset fourth, optionally with the pressure medium Has pressure space for the return stroke of the working piston, wherein the fourth pressure space, at least partially, between the Pre-stroke hollow piston and the working piston is arranged.
  • the piston-cylinder arrangement according to the invention is a Two-chamber cylinder that only has two valves up to 45 Percent runs faster than the well-known welding gun cylinder.
  • Each of the two chambers comprises two pressure spaces - on the one hand for the respective advance stroke, on the other hand for the respective return stroke of the working piston and the preliminary stroke hollow piston.
  • the speed advantage over the known arrangement is achieved in that the Pre-stroke of the pre-stroke hollow piston, the third pressure chamber depressurized can be without the working piston prematurely Stroke movement because this is done by an im fourth pressure chamber pending pressure can be prevented can.
  • the supply of the fourth pressure chamber with the pressure medium can - like supplying the other pressure rooms - Via internal channels running into the cylinder head and is therefore advantageously due to a compact Marked construction.
  • the first tube that starts from a channel opening in the cylinder head centrically and axially through the pre-stroke hollow piston in extends the second pressure chamber and comprises a second tube, starting from another channel opening in the Cylinder head inside and coaxial to the first pipe the pre-stroke hollow piston and through the working piston extends into the fourth pressure chamber.
  • a working pressure of about 10 bar can be used for spot welding with a Welding gun that a piston-cylinder arrangement according to the invention contains, depending on the version, cylinder forces of 3500 to 11000 N are generated, the working cycle itself For example, can reduce from 500 ms to 180 ms.
  • Fig. 1 represents a working phase of an inventive Piston-cylinder arrangement, from which in particular the Structure and location of the various pressure rooms very much is clear. It gets more specific on that which phase of work is involved acts.
  • the piston-cylinder arrangement according to the invention is a double-acting arrangement, ie it is designed to carry out a double stroke, namely a preliminary stroke VH and a working stroke AH.
  • the piston-cylinder arrangement according to the invention is used in particular to drive a welding electrode 1 of a welding gun and consists of a cylinder 2, a pre-stroke hollow piston 3, which is axially movably guided in the cylinder 2, and a piston rod 4, which is axially movably guided in the pre-stroke hollow piston 3 connected working piston 5.
  • the length of the axial guide path of the preliminary stroke hollow piston 3 in the cylinder 2 corresponds to the preliminary stroke VH or the corresponding return stroke RH V.
  • the length of the axial guide path of the working piston 5 corresponds to the working stroke AH or the corresponding return stroke RH A.
  • the cylinder 2 is connected to a fixed welding electrode (not shown) and the piston rod 4 is connected to the movable welding electrode 1.
  • first pressure chamber 7 between the preliminary stroke hollow piston 3 and a cylinder head 6, a second pressure chamber 8 between the preliminary stroke hollow piston 3 and the working piston 5, and between the piston arrangement 9 formed from the working piston 5 and the preliminary stroke hollow piston 3 and a cylinder base 10 is a third pressure chamber 11 enclosing the piston rod 4.
  • the individual pressure chambers 7, 8, 11 can optionally be acted upon with a pressure medium, in particular with compressed air.
  • the first pressure chamber 7 is pressurized with the pressure medium for performing the forward stroke VH of the preliminary stroke hollow piston 3.
  • the second pressure chamber 8 is pressurized with the pressure medium to carry out the working stroke AH of the working piston 3, and the third pressure chamber 11 is pressurized with the pressure medium to carry out the return stroke RH V of the preliminary stroke hollow piston 3.
  • the piston-cylinder arrangement has a fourth pressure chamber 12, which can optionally be pressurized with the pressure medium, for the return stroke RH A of the working piston 5.
  • Part of the fourth pressure chamber 12 is arranged between the preliminary stroke hollow piston 3 and the working piston 5.
  • Another part of the fourth pressure chamber 12 is formed by an inner chamber 13 of the piston rod 4. This is particularly important from the point of view of the special feeding of the printing medium into the fourth printing space to be described in detail below.
  • the different channel openings 14, 15, 19, 20 can advantageously with a valve arrangement, not shown with a valve control block attached to the cylinder head 6 be connected, the pressure spaces 7, 8, 11, 12 via the internal, through the valve control block and the Cylinder head 6 extending channel openings 14, 15 and pipes 16, 21 are connected to the valve arrangement.
  • the channel opening 19 in the cylinder base 10 to act on the third Pressure chamber 11 with the pressure medium can - with all Advantages of tubeless routing of the print medium - also, namely via an outside, not shown of the cylinder 2 guided pipeline, with the cylinder head 6 be connected.
  • the individual pressure rooms 7, 8, 11, 12 are against each other and sealed pressure-tight against the atmosphere:
  • first pressure chamber 7 against the second Pressure chamber 8 is on the outside diameter of the second Pressure chamber 8 extending tube 16 a sealing ring 22 in Area of the wall or the unspecified Head of the preliminary stroke hollow piston 3 arranged.
  • Sealing ring 23 arranged for sealing of the first pressure chamber 7 against the third pressure chamber 11 another on the outer diameter of the preliminary stroke hollow piston 3 Sealing ring 23 arranged.
  • the working piston 5 is inside the preliminary stroke hollow piston 3 forming the second pressure chamber 7 and the fourth Pressure chamber 12 chambered pressure-tight and - as already mentioned - guided axially.
  • a sealing ring 26 is arranged to seal the third Pressure chamber 11 against the fourth pressure chamber 12 in the area of the wall or the unspecified bottom of the preliminary stroke hollow piston 3 .
  • Another sealing ring 27 is for sealing of the third pressure chamber 11 on the electrode side against the atmosphere on the outside diameter of the piston rod 4.
  • Fig. 2 shows the basic position of the piston-cylinder arrangement according to the invention, which is characterized by the smallest axial extent (length) of the arrangement.
  • Both the preliminary stroke hollow piston 3 and the working piston 5 guided in the preliminary stroke hollow piston 3 and connected to the piston rod 4 are in an end position on the side of the cylinder head 6, so that the first pressure chamber 7 and the second pressure chamber 8 are each one Have volume that is almost zero or minimal.
  • This basic position is reached when the third pressure chamber 11 and the fourth pressure chamber 12 are acted upon by the pressure medium and so both the forward stroke hollow piston 3 and the working piston 5 have carried out their return stroke RH (RH V or RH A ).
  • Fig. 2 illustrates in a special way the constructive Advantageousness of the piston-cylinder arrangement according to the invention.
  • 21 of the pressure medium becomes a very space-saving telescopic nesting of the individual components achieved: pre-stroke hollow piston 3 in the cylinder 2, working piston 5 in the pre-stroke hollow piston 3, first tube 16 in the central opening 17 of the working piston 5 and in the inner chamber 18 of the piston rod 4, second tube 21 within the first tube 17 and in the inner chamber 13 of the piston rod 4.
  • the depth of the Inner chambers 13, 18 is exactly on the length of the tubes 21, 16 matched.
  • the preliminary stroke hollow piston 3 shows the piston-cylinder arrangement according to the invention in a work phase at the end of the preliminary stroke VH before the start of the AH work stroke.
  • the preliminary stroke hollow piston 3 is in an end position on the side of the cylinder bottom 10, so that the first pressure chamber 7 is at its maximum Has volume, while the volume of the third pressure chamber 11 is almost zero or minimal.
  • the working piston 5 is - seen relative to the preliminary stroke hollow piston 3 still in its end position shown in Fig. 2.
  • the working piston 5 is on the cylinder head side on the preliminary stroke hollow piston 3 and works together with it a pressure in the first pressure chamber 7, the preliminary stroke VH.
  • the constant working of the working piston 5 am Pre-stroke hollow piston 3 during the entire advance stroke VH can thereby by acting on the fourth pressure chamber 12 can be achieved with the print medium.
  • the second pressure room 8 still has a volume that is almost zero or is minimal.
  • the third pressure chamber 11 is depressurized.
  • the table below shows the working phases of the piston-cylinder arrangement according to the invention with steps 0 to 8, step 0 of the basic position shown in FIG. 2, step 1 of the position shown in FIG. 3 after execution of the advance stroke VH and Step 3 corresponds to the welding position shown in FIG. 4 after execution of the forward stroke VH and the working stroke AH.
  • steps 0 to 8, step 0 of the basic position shown in FIG. 2 step 1 of the position shown in FIG. 3 after execution of the advance stroke VH and Step 3 corresponds to the welding position shown in FIG. 4 after execution of the forward stroke VH and the working stroke AH.
  • 0 means that the corresponding pressure chamber 7, 8, 11, 12 is depressurized
  • 1 symbolizes the presence of pressurization.
  • the pressure spaces 7, 8, 11, 12 are identified in the table by their reference numerals.
  • the most important advantage achieved by the invention is in that the third pressure chamber 11, as the table shows, depressurized when performing the advance stroke VH (step 1) can be because the working piston 5 - relative to the preliminary stroke hollow piston 3 - by the pressure in the fourth pressure chamber 12 in its end position shown in Fig. 2 is held.
  • This is in a known, based on the principle of suppression working piston-cylinder arrangement, for example has a cycle time of about 500 ms, not the case, whereby the duration of a work cycle is comparable to a comparable one arrangement according to the invention without an additional Bleed valve can be shortened to about 180 ms.
  • Step AH To carry out the working stroke AH, after the Vorhub VH the fourth pressure chamber 12 relieved of pressure and second pressure chamber 8 is acted upon by the pressure medium (Steps 2 and 3). If the working stroke AH is available the welding process can be carried out.
  • the second pressure chamber 8 is first depressurized, while the fourth pressure chamber 12 is again pressurized with the pressure medium (step 4).
  • the working piston 5 thereby executes its return stroke RH A , ie it is moved again in the direction of its basic position shown in FIGS. 2 and 3.
  • FIG. 1 shows an intermediate position of the piston-cylinder arrangement according to the invention, which corresponds approximately to step 6 or 7 in the table.
  • the invention is not based on the illustrated embodiment limited, but also includes all in the sense of Invention equivalent effects.
  • the size of the strokes vary: this is how the size of the forward stroke VH in a range from 10 to 100 mm and that of the working stroke AH are in a range from 5 to 50 mm.
  • the invention also falls within the scope of the invention, for example, if the shape of the pressure spaces 7, 8, 11, 12 that on a Pressure medium network pressure of up to 12 bar can, deviates from the shape shown in the drawing.
  • the invention is not limited to that in the claim 1 defined combination of features limited, but can also by any other combination of certain Characteristics of all of the individual characteristics disclosed defined be. This means that basically practical each individual feature of claim 1 omitted or by at least one disclosed elsewhere in the application Single feature can be replaced.
  • Claim 1 only as a first attempt at formulation to understand for an invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Welding (AREA)
  • Actuator (AREA)
EP98119668A 1997-10-25 1998-10-17 Piston-cylindre pour pince de soudage Withdrawn EP0914896A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997147298 DE19747298A1 (de) 1997-10-25 1997-10-25 Schweißzangenzylinder
DE19747298 1997-10-30

Publications (2)

Publication Number Publication Date
EP0914896A2 true EP0914896A2 (fr) 1999-05-12
EP0914896A3 EP0914896A3 (fr) 1999-12-15

Family

ID=7846689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98119668A Withdrawn EP0914896A3 (fr) 1997-10-25 1998-10-17 Piston-cylindre pour pince de soudage

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EP (1) EP0914896A3 (fr)
DE (1) DE19747298A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1239166A1 (fr) * 2001-02-28 2002-09-11 IROSS Srl Actionneur linéaire de type cylindrique
EP1286814A1 (fr) * 2000-06-05 2003-03-05 D-M-E Company Actionneur presentant deux surfaces du piston
FR2865950A1 (fr) * 2004-02-06 2005-08-12 Finuchem Technologies De Souda Verin de pince de soudage a double course.
WO2006130120A1 (fr) * 2005-06-01 2006-12-07 Tajfun Planina Proizvodnja Strojev, D.O.O. Unite d'entrainement et de commande d'une fendeuse de bois a bruler et procede de commande de ladite machine
EP2829479A1 (fr) 2013-07-23 2015-01-28 Cryovac, Inc. Appareil d'emballage comprenant un actionneur et procédé de fonctionnement d'un appareil d'emballage
CN113389767A (zh) * 2021-07-23 2021-09-14 中国科学院合肥物质科学研究院 一种长冲程大缸径结构双作用式气动执行器及其控制系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8065930B2 (en) * 2008-03-26 2011-11-29 GM Global Technology Operations LLC Hydraulic actuator for transmissions having reduced noise

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9419815U1 (de) 1994-12-10 1995-02-16 Nimak Automatisierte Schweiste Antriebszylinder für eine Schweißvorrichtung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9100595A (nl) * 1991-04-05 1992-11-02 Sempress B V Maschf Geintegreerde dubbele aandrijfcilinder.
US5789719A (en) * 1991-05-02 1998-08-04 Milco Manufacturing Co. Method and apparatus for electrical resistance spot welding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9419815U1 (de) 1994-12-10 1995-02-16 Nimak Automatisierte Schweiste Antriebszylinder für eine Schweißvorrichtung

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1286814A1 (fr) * 2000-06-05 2003-03-05 D-M-E Company Actionneur presentant deux surfaces du piston
EP1286814A4 (fr) * 2000-06-05 2003-08-13 Dme Co Actionneur presentant deux surfaces du piston
EP1239166A1 (fr) * 2001-02-28 2002-09-11 IROSS Srl Actionneur linéaire de type cylindrique
FR2865950A1 (fr) * 2004-02-06 2005-08-12 Finuchem Technologies De Souda Verin de pince de soudage a double course.
WO2005084871A1 (fr) * 2004-02-06 2005-09-15 Finuchem Technologies De Soudage Verin de pince de soudage a double course
WO2006130120A1 (fr) * 2005-06-01 2006-12-07 Tajfun Planina Proizvodnja Strojev, D.O.O. Unite d'entrainement et de commande d'une fendeuse de bois a bruler et procede de commande de ladite machine
EP2829479A1 (fr) 2013-07-23 2015-01-28 Cryovac, Inc. Appareil d'emballage comprenant un actionneur et procédé de fonctionnement d'un appareil d'emballage
CN113389767A (zh) * 2021-07-23 2021-09-14 中国科学院合肥物质科学研究院 一种长冲程大缸径结构双作用式气动执行器及其控制系统

Also Published As

Publication number Publication date
DE19747298A1 (de) 1999-04-29
EP0914896A3 (fr) 1999-12-15

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