EP0333663B1 - Einrichtung an einer Schweissmaschine zum Zuführen von an Werkstücke anzuschweissenden Drähten, insbesondere Querdrahtzuführeinrichtung an einer Gitterschweissmaschine und Verfahren zum Zuführen von an ein Werkstück anzuschweissenden Drähten - Google Patents

Einrichtung an einer Schweissmaschine zum Zuführen von an Werkstücke anzuschweissenden Drähten, insbesondere Querdrahtzuführeinrichtung an einer Gitterschweissmaschine und Verfahren zum Zuführen von an ein Werkstück anzuschweissenden Drähten Download PDF

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Publication number
EP0333663B1
EP0333663B1 EP89810193A EP89810193A EP0333663B1 EP 0333663 B1 EP0333663 B1 EP 0333663B1 EP 89810193 A EP89810193 A EP 89810193A EP 89810193 A EP89810193 A EP 89810193A EP 0333663 B1 EP0333663 B1 EP 0333663B1
Authority
EP
European Patent Office
Prior art keywords
wire
grippers
welding
workpiece
gripper
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
EP89810193A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0333663A1 (de
Inventor
Emil Denzler
Paul Rudin
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.)
HA Schlatter AG
Original Assignee
HA Schlatter AG
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 HA Schlatter AG filed Critical HA Schlatter AG
Priority to AT89810193T priority Critical patent/ATE75429T1/de
Publication of EP0333663A1 publication Critical patent/EP0333663A1/de
Application granted granted Critical
Publication of EP0333663B1 publication Critical patent/EP0333663B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
    • B21F27/10—Making wire network, i.e. wire nets with additional connecting elements or material at crossings with soldered or welded crossings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F23/00—Feeding wire in wire-working machines or apparatus

Definitions

  • the invention relates to a device on a welding machine for feeding wires to be welded to workpieces and to a method for closing to lead of wires to be welded to a workpiece according to the preamble of claims 1 and 14.
  • the welding machine can in particular be a grid welding machine in which the wires fed from the device to the welding points on the longitudinal wires of the grid to be produced are welded on as transverse wires.
  • the invention is independent of the type of workpieces and the welding machine adapted to them.
  • the workpiece can, for example, also be a cooling or heating coil, the turns of which are to be supported on one another by welded-on wires, the surface of the heat exchanger being increased by the wires.
  • a cross wire feed device on a mesh welding machine has cup-shaped wire receptacles for receiving the transverse wire to be fed.
  • the wire receptacles have a cylindrical cavity which is adapted to the wire and which has a cheek-shaped part in the direction of the welding electrodes for the purpose of revealing the inserted wire.
  • the grippers can be moved between the cross wire pickup and the welding position by means of a shaft and thumb disks. The movement that the gripper performs between the two end positions is such that a new wire can be inserted into the wire pickup while a cross wire is being conveyed.
  • the path on which the grippers guide the cross wire is not linear.
  • the grippers each have a fixed and a resilient finger to pick up the cross wire.
  • the fixed finger is fork-shaped at the end.
  • the resilient finger is longer than the fork-shaped finger and holds the cross wire in place in the fork during transport.
  • the known device works according to the following method: First, the cross wire is inserted into the cup-shaped wire receiver and cut off. The cut cross wire is then grabbed by the grippers and moved directly to the welding position.
  • the transport path is designed in such a way that a new cross wire can be introduced into the transducers at the same time that the cross wire is conveyed to the longitudinal wires.
  • the object is achieved to create a device of the type mentioned, which feeds the wires quickly, reliably and accurately to the welds on the workpiece in the machine, in the event of a fault on the Blocking of the device and its consequential damage can be avoided.
  • the advantages achieved by the invention can essentially be seen in the fact that a high working speed can be achieved.
  • 60 cross wires per minute could be fed and welded on a grid welding machine, with two feed devices arranged in succession, 120 cross wires per minute, the feed speed being 6-7 meters per second.
  • the upper limit of performance has not yet been reached.
  • the feed path can run in any direction. So one machine can simultaneously weld two grids in one another
  • a feed device levels the cross wires obliquely downwards to the welding points of the upper grid and a second device leads the cross wires diagonally upwards to the welding points of the lower grid.
  • the wires to be fed can be withdrawn from a spool or a reel, straightened, inserted into the wire receptacle and then cut off at the entrance thereof, while the grippers guide the previously cut wire to the welding points, and then withdrawn around the wire that has meanwhile been inserted into the wire receiver to take the next wire.
  • the special design of the resiliently held jaws of the grippers ensures that the grippers automatically grip the wire to be fed and detach themselves from the welded-on wire without the need for a special gripper mechanism. It is sufficient to simply move the grippers in the opposite direction to the feed direction both for gripping a wire picked up by the wire receiver and for detaching from a welded-on wire.
  • a special design of the grippers and the gripper drives ensures that the device does not block while avoiding consequential damage if the grippers are prevented from moving in the feed direction or in the opposite direction.
  • the feed device is characterized by fast, accurate and trouble-free operation with a simple construction.
  • the invention has the advantage that one wire is kept ready for the next weld in the standby position, while at the same time a new wire is freely inserted into the wire receptacle and the welding process of the previous wire is completed and the factory piece with the welded wires can be advanced.
  • a buffer or single-wire buffer is created, which can be called up immediately if the welding of the preceding wire and the feed of the workpiece allow it, since the wire is held in the ready position by the grippers and can be moved on without delay can.
  • the buffer allows compensation for delays or faults in the welding process or workpiece feed.
  • the provision of the wire in the ready position is expediently as close as possible to the welding point, that is to say so close to the welding point that the grippers and the wire held by them are just outside the range of movement of the welding electrodes and the workpiece with the welded-on wires.
  • a transverse wire pickup with two groove-shaped receiving elements 1 and 2, which are arranged flush with one another at a distance from one another such that the open groove side faces the welding point 3 on the longitudinal wires 4; a gripper 6, which detects a transverse wire 5 received in the transverse wire pickup between the receiving elements 1 and 2, feeds the welding points 3 in the feed direction 7, detaches itself from the supplied transverse wire 5 'after the welding process and is then moved back in the direction 8 opposite to the feeding direction 7 to take the next cross wire 5, which has meanwhile been introduced into the pickup 1, 2; two covers 10 and 11, which keep the open channel side of the receiving elements 1 and 2 closed during the insertion of a cross wire, and a drive device 13, 14 for the gripper 6 and a drive device 16, 17 for the covers 10 and 11.
  • the drive members 13 and 16 of the two drive devices can, as shown in the drawing, have a common drive shaft 19. However, they are expediently driven independently of one another by different drive means, the drive means being controlled by a common control device (not shown) in such a way that the covers 10, 11 are moved into their closed position as soon as the transverse wire 5 captured by the grippers 6 receives the receiving elements 1 , 2 has left.
  • the assembly is mounted on a base plate 22, the two bearing housings 24 and 25 for a common shaft 26 for pivoting the two covers 10 and 11, a guide 28 for a push rod 29 carrying the gripper 29 and a bearing housing 31 for the drive shaft 19 with the Drive members 13 and 16 carries.
  • the clear width of the channel profile of the receiving elements 1 and 2 is tapered in the direction 33 in which the respective transverse wire is to be inserted into the receptacle 1, 2.
  • the receiving element 1 is attached to the bearing housing 25 by a shoulder 35 of the bearing housing 24, the receiving element 2 accordingly.
  • the covers 10 and 11 are each attached to an arm 38 or 41 of an angle lever 38/39 or 41/42 which sits on the shaft 26.
  • On the other, forked arm 39 of the angle lever 38/39 a connecting rod 17 of an eccentric gear engages, the eccentric 16 of which is seated on the drive shaft 19.
  • the other angle lever arm 42 of the angle lever 41/42 is not used.
  • a one-armed lever would suffice here, only for the same components, two angle levers are used.
  • the connecting rod 17 is in three parts, a first part 47 is articulated on the lever arm 39.
  • the middle part 48 can be screwed in part 47 to set the connecting rod length, fixed by means of a lock nut 50, rotatably and displaceably mounted in the third part 49 and equipped with a head 51 which is pressed by a coil spring 52 against a stop 53.
  • the spring 52 yields when the covers 10 and 11 reach their closed position, the lever arms 38 and 41 each abutting a stop 54 or 55, one of which is attached to the receiving element 1 and the other of which is attached to the receiving element 2.
  • the stops 54 and 55 consist, for example, of plastic of the brand name nylon or Delrin or another material with similar properties.
  • the three-part design of the connecting rod 17 in connection with the stops 54 and 55 means that the open position of the covers 10 and 11 can be changed without influencing their closed position by screwing the part 48 more or less deeply into the part 47.
  • Each gripper 6 has two jaws 57 and 58, each of which is attached to one end of a leaf spring 60 or 61 in an electrically insulated manner and is resiliently pressed against one another by these springs.
  • the elongated supports of the leaf springs 60 and 61 forming the jaws 57 and 58 are spaced apart from one another transversely to the wire feed direction 7, 8 and to the longitudinal direction of the wire receiving elements 1, 2, so that a wire 5 to be fed during the movement of the grippers 6 between the two leaf springs 60, 61 each gripper 6 can be inserted into the channel-shaped wire receiving elements 1, 2.
  • the leaf springs 60, 61 then run diverging from the jaws 57 and 58 and then parallel to one another to a holder 63 in which the other ends of the leaf springs 60 and 61 are inserted.
  • the distance between the parallel parts of the leaf springs 60 and 61 is not greater than the dimension of the receiving elements 1 and 2 parallel to this distance.
  • the holder 63 is firmly connected to the push rod 29.
  • Each of the gripper jaws 57, 58 has a groove, the flank 65 facing the end of the gripper so inclined that the jaws in the state shown in Fig. 4 on these flanks 65 on the welded cross wire 5 'give way to detach from it when the gripper 6 is retracted in the direction 8 (FIG. 1) after welding this cross wire.
  • each jaw has a bevel 66 on which the resilient jaws 57 and 58 slide to receive in their grooves a wire 6 inserted into the transverse wire pickup 1, 2 when the gripper 6 approaches the end of its retraction movement 8.
  • each jaw has a hole into which a spring-loaded ball 68 engages. This avoids jamming and damage to the cross wire feeder if one or both of the jaws are prevented from retracting 8 due to any irregularity or malfunction. Then the leaf spring 60 or 61 carrying the hindered jaws is released from the holder 63 without the cross wire feed device being blocked, which could lead to damage.
  • the leaf spring 60 or 61 with the relevant jaws 57 or 58 can simply be put back into the holder 63.
  • a further protection against blocking and its consequential damage to the device, which acts during the advance 7 and retraction 8 of the gripper of the unit, is described below in connection with the gripper drive 13/14.
  • a gear rim 13 meshes with a part 14 of the push rod 29 designed as a toothed rack.
  • the gear rim 13 is mounted on a bush 72, which is firmly seated on the drive shaft 19 and on which the eccentric 16 is also formed, and by being uniform on the bush circumference or inner circumference of the gear rim 13 distributed locking devices 74 (only two of which are shown in Fig. 2) connected to the socket 72.
  • the bushing 72 is supported in roller bearings 76 in the bearing housing 31.
  • Each locking device 74 consists of a ball which is displaceable in a radial bore of the bush 72 and is pressed by a spring into a recess on the inner circumference of the gear rim 13.
  • the latching resistance of the latching devices 74 is not overcome, so that the drive shaft 19 takes the gear rim 13 with the bush 72 firmly seated on it in order to displace the push rod 29/14 and thus the gripper 6 with the jaws 57, 58.
  • the gripper 6 is prevented from feeding 7 or retracting 8 by any malfunction or irregularity in the operation of the welding machine (or the cross wire feed device)
  • the correspondingly sized locking resistance of the locking devices 74 is exceeded and the rotation of the bushing 72 is no longer transmitted to the gear rim 13 , the device continues to run, apart from the hindered gripper movement, it is not blocked and the consequences of a blockage are prevented.
  • the feed and return 7 and 8 of the gripper 6 can be limited by stops (not shown) in order to ensure the timely cooperation of the gripper 6 and the covers 10 and 11 after the fault has been eliminated. If, for example, four latching devices 74 are provided, there are as many latching positions of the bushing 72 with respect to the gear rim 13, however only one of these rest positions is the right one for cooperation. In the correct latching position, the latching resistance is not exceeded either at the end of the gripper advance 7 or at the end of the gripper return 8.
  • the latching resistance is exceeded either at the end of the gripper advance or at the end of the gripper return, so that the bush 72, after removing the obstacle to movement of the gripper 6, drives the gear rim 13 until it is in the correct position with respect to the bush 72 has.
  • the timely cooperation of the grippers 6 and covers 10, 11 can also be controlled without stops.
  • the drive shaft 19 is in a first step by z. B. rotated 120 ° clockwise; afterwards the shaft is z. B. rotated 60 ° further clockwise and finally it is turned back in a third step by 180 ° counterclockwise.
  • the drive is carried out by a DC motor with a controller controlled by a control device, an angle detection (angle encoder) for the control device being provided on the drive shaft 19.
  • the control device is connected to monitoring means for monitoring the position of the welding electrodes and / or the workpiece with the welded-on wires and for emitting a release signal which is emitted when the welding electrodes and / or the workpiece or the last wire welded thereto has a specific one Have reached or exceeded position.
  • the monitoring means can e.g. B. light barriers, limit switches or angle encoders, which in certain positions the welding electrodes (or their drive means) and the workpiece or the last welded wire (or the feed device for the workpiece) each generate a release signal.
  • the cross wire 5 can (in a manner not shown) be pulled from a spool or a reel through a straightening device and a cutting device arranged in the feed direction 33 in front of the pickup 1, 2 and pushed into the pickup 1, 2 and then cut off when the covers 10 , 11 in the closed position and the grippers 6 are not or not fully withdrawn.
  • the grippers 6 of the device have ended their push-back movement 8 and have thereby gripped the transverse wire 5 previously introduced into the transverse wire receptacles 1 and 2, whereby the drive shaft 19 ended a half turn counterclockwise. In a first step, it now turns clockwise by 120 °.
  • the grippers 6 are advanced from one end position into an intermediate position, while the covers 10, 11 pivot into the open position 10 'shown in dash-dotted lines in FIG.
  • the wire 5 gripped by the grippers 6 is removed from its gripping position in the wire receiver 1, 2 transferred to a standby position, in which he and the gripper jaws 57, 58 lie both outside the wire receptacles 1, 2 and outside the welding area (movement area of the welding electrodes) and the movement area of the workpiece 4 with the wires already welded on, so that a next wire can be introduced into the wire pickup and movements of the welding and workpiece feed means can take place unhindered.
  • the control device already initiates during this first step, immediately after the grippers 6 have guided the wire 5 out of the covers 10, 11, that the covers go back from the open position 10 'into the closed position 10 and the next wire is introduced into the wire receiver 1, 2.
  • the second step is controlled by the control device: the drive shaft is turned Turned 60 ° clockwise, the gripper 6 is brought from the intermediate position to the other end position and the wire 5 held by the grippers 6 from the ready position to the welding position on the workpiece 4.
  • the cross wire is now held at the welding points 3 of the longitudinal wires 4 in order to be welded to them.
  • the drive shaft 19 is rotated counterclockwise by 180 °.
  • the grippers 6 are retracted in the direction 8, whereby they first detach from the welding wire held (or already welded on) the cross wire 5 'and at the end of their retraction movement 8 the cross wire 5, which has meanwhile been introduced into the cross wire pickup 1, 2, is detected. The work cycle described is then repeated.
  • the welding process is ended and the grating being manufactured is pushed further by a distance corresponding to the cross wire distance, the wire being held in the ready position by the grippers as long as it is forwarded to the welding point (because of the movement of the welding electrodes and the grid with the welded wires) has not yet been released by the control device (in the absence of a release signal).
  • the covers 10, 11 can already leave their closed position when the gripper jaws 57 and 58 approach the wire receiving elements 1 and 2. Even a cross wire previously fallen out of the transducers 1 and 2 is guided to the jaws 57 and 58 when the grippers of the device are withdrawn between the parts of the leaf springs 60 and 61 converging towards the jaws 57 and 58, if the jaws 57 and 58 pass into the space between the receiving elements Enter 1 and 2.
  • gears of another suitable type for example cam gears or pneumatic or hydraulic gears, can also be used.
  • the device is expediently adjustable perpendicular to the plane of the line wires.
  • the device can also be operated in such a way that the grippers 6 go from one end position directly to the other end position in one step if the work cycle is selected such that the welding and the further transport of the grid take place very quickly compared to the feeding of the wire .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
EP89810193A 1988-03-18 1989-03-13 Einrichtung an einer Schweissmaschine zum Zuführen von an Werkstücke anzuschweissenden Drähten, insbesondere Querdrahtzuführeinrichtung an einer Gitterschweissmaschine und Verfahren zum Zuführen von an ein Werkstück anzuschweissenden Drähten Expired - Lifetime EP0333663B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89810193T ATE75429T1 (de) 1988-03-18 1989-03-13 Einrichtung an einer schweissmaschine zum zufuehren von an werkstuecke anzuschweissenden draehten, insbesondere querdrahtzufuehreinrichtung an einer gitterschweissmaschine und verfahren zum zufuehren von an ein werkstueck anzuschweissenden draehten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1054/88 1988-03-18
CH1054/88A CH674718A5 (en(2012)) 1988-03-18 1988-03-18

Publications (2)

Publication Number Publication Date
EP0333663A1 EP0333663A1 (de) 1989-09-20
EP0333663B1 true EP0333663B1 (de) 1992-04-29

Family

ID=4201373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810193A Expired - Lifetime EP0333663B1 (de) 1988-03-18 1989-03-13 Einrichtung an einer Schweissmaschine zum Zuführen von an Werkstücke anzuschweissenden Drähten, insbesondere Querdrahtzuführeinrichtung an einer Gitterschweissmaschine und Verfahren zum Zuführen von an ein Werkstück anzuschweissenden Drähten

Country Status (5)

Country Link
EP (1) EP0333663B1 (en(2012))
AT (1) ATE75429T1 (en(2012))
CH (1) CH674718A5 (en(2012))
DE (1) DE58901260D1 (en(2012))
ES (1) ES2032680T3 (en(2012))

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE204606C (en(2012)) * 1900-01-01
AT368045B (de) * 1980-03-31 1982-08-25 Evg Entwicklung Verwert Ges Vorrichtung zum zufuehren von querstaeben zu einer gitterschweissmaschine

Also Published As

Publication number Publication date
ATE75429T1 (de) 1992-05-15
DE58901260D1 (de) 1992-06-04
CH674718A5 (en(2012)) 1990-07-13
ES2032680T3 (es) 1993-02-16
EP0333663A1 (de) 1989-09-20

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