AT503608A1 - Roller especially drive roller for welding wire feed device with slot-shaped recess and inserted piece element useful in welding technology can be fixed simply and reliably to shaft - Google Patents

Abstract

A roller, especially a drive roller for a welding wire feed device with a slot-shaped recess (43) and a bearing bore (44)(sic) for setting a shaft (45) in the roller center, an inserted piece element (42) and a means for fixing to the shaft (45). The inserted piece element has a centering surface (47) for centering the roller on the shaft.

Description

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The invention relates to a roller, in particular drive roller, for a device for conveying a welding wire with a groove-shaped indentation and a bearing bore for the arrangement of a shaft in the center of the roller, in particular drive roller.

Devices for conveying a welding wire are known from the prior art, in which at least one pair of rollers, in particular at least one drive roller and at least one pressure roller, are used for wire conveying. In this case, the role, in particular the drive roller, for example, plugged onto a shaft and fixed by another fastener on the shaft. The pressure roller is pressed against the drive roller or with inserted welding wire against it, for example via elastic elements or extra clamping levers. Furthermore, the pair of rollers is fixed in its axial position or has a low clearance. For ease of wire promotion, for example, grooves or indentations are arranged in the rollers. To determine the wire feed speed, another pair of rollers can be used. Of course, the wire feed speed can also be determined via the pressure roller. In this case, the welding wire extends between a roller which determines the rotational speed and another roller and / or a surface. From the rotational speed of the at least one roller, the welding wire speed can be determined.

For example, WO 2001/28728 A2 and WO 2003/022501 A2 describe such devices for conveying a welding wire, which, however, have a relatively large construction. Furthermore, the pressure lever in the operating position can not be fixed.

A disadvantage of the known from the prior art wire feeders that the dimensions are relatively large, whereby welding torch with built-in wire feeders are very large, whereby the handling of the welding torch and further accessibility is significantly disturbed. Furthermore, an assembly and a change of roles of the wire feeding device is tedious and complicated. The pair of rollers is fixed to each other in the axial position or has a slight play, which can be caused by manufacturing tolerances skew and / or displacement of the two rollers to each other, whereby the wire feed is much more difficult and the welding wire can be deformed. When threading the welding wire in the wire feed device at least one role must be folded away, swung away or pushed away. As a result, the wire is largely unguided during the threading process, so this can get out of the guide during threading. By a further pair of rollers for detecting the wire feed speed, the dimensions are further increased.

The object of the invention is to provide a simple and reliable attachment of the rollers, in particular the drive roller, the wire feed device to a shaft.

The object is achieved by a roller, in particular drive roller, for a device for the promotion of a welding wire with a groove-shaped recess and a bearing bore for the arrangement of a shaft in the center of the roller, in particular the drive roller, wherein a projection element and a means for attachment to the shaft is provided.

Another advantage is an embodiment of the roller according to claims 2 and 3, since characterized the role has a longer guide area on the shaft and the means for fixing can also be arranged in the approach element.

Another advantage is also an embodiment according to claim 4, characterized in that the roller or the neck element is fastened directly to the shaft and thus no additional parts or elements are needed. Furthermore, the production of the role or the neck element in a simple manner is feasible.

It is also an embodiment according to claim 5 of advantage, since a simple centering of the roller and / or the neck element is ensured and thereby the wire delivery runs exactly.

Due to the configuration according to claims 6 and 7, is achieved in an advantageous manner that the roller or the groove-shaped recess is protected during assembly or when replacing the role, since the work area or the area in which the tool for role replacement is stated, is precisely defined. Furthermore, by the use of a tool, the torque of the attachment of the roll can be precisely determined, whereby a reproducible roll mounting or a reproducible role exchange is possible.

Also advantageous is an embodiment according to claims 8 and 9, characterized in that the shaft can be performed in a simple manner, further on the intermediate piece corresponding surfaces and / or threads are arranged, and thus a simple and cost-effective production is achieved. Furthermore, it is advantageous that with existing shaft, the flexibility is increased with respect to the use of different types of reels, since in this case the intermediate piece can be replaced, but the shaft does not need to be changed.

It is also an embodiment according to claim 10 of advantage, since thereby the power transmission from the motor to the roller or the rotational speed of the roller can be influenced.

The present invention will become more apparent from the accompanying drawings which illustrate embodiments of the invention.

1 shows a schematic representation of a welding machine or a welding device; 2 to 4 different views of an embodiment of a device according to the invention for conveying a welding wire; Fig. 5 is a perspective view of a drive roller with an adapter connected thereto and; and FIG. 6 shows a sectional view through the drive roller and the intermediate piece according to FIG. 5.

In Fig. 1, a welding apparatus 1 or a welding system for a variety of processes or processes, such. MIG / MAG welding or TIG / TIG welding or electrode welding, double wire / tandem welding, plasma or soldering · · · · · · · · · · · · ♦ · t · ··· ····· Α ·· 4 · * · t · · · · · · · · · driving, etc., are shown.

The welding device 1 comprises a current source 2 with a power part 3, a control device 4 and a switching element 5 associated with the power part 3 or the control device 4. The switching element 5 or the control device 4 is connected to a control valve 6 which is arranged in a supply line 7 for a gas 8, in particular a protective gas, such as CO 2, helium or argon and the like., Between a gas storage 9 and a welding torch 10 and a burner is arranged.

In addition, via the control device 4, a wire feed device 11, which is customary for MIG / MAG welding, are controlled, via a supply line 12, a filler material or a welding wire 13 from a storage drum 14 and a wire reel in the region of the welding torch 10 is supplied. Of course, it is possible that the wire feeder 11, as is known from the prior art, is integrated in the welding device 1, in particular in the base housing, and not, as shown in Fig. 1, is designed as an accessory. The wire feeder can also be designed for the barrel promotion. It is also possible for the wire feeder 11 to supply the welding wire 13 or the additional material outside the welding torch 10 to the processing station, wherein a non-consumable electrode is preferably arranged in the welding torch 10, as is customary in TIG / TIG welding.

The current for building up an arc 15, in particular a working arc, between the electrode or the welding wire 13 and a workpiece 16 is supplied via a welding line 17 from the power section 3 of the power source 2 to the welding torch 10, in particular the electrode, wherein the workpiece to be welded 16, which is formed from several parts, via a further welding line 18 also with the welding device 1, in particular with the power source 2, is connected, and thus a circuit can be constructed via the arc 15 and a plasma jet formed for a process.

For cooling the welding torch 10, it is possible to use a cooling circuit ······ · · · · · · · · ··············································································· The welding torches 10 are connected, for example with the interposition of a flow monitor 20, to a liquid container, in particular a water container 21, whereby during commissioning the welding torch 10 of the cooling circuit 19, in particular a liquid pump used for the liquid arranged in the water tank 21, is started, and thus cooling of the welding torch 10 can be effected.

The welding device 1 further has an input and / or output device 22, via which the most varied welding parameters, operating modes or welding programs of the welding device 1 can be set or called up. In this case, the welding parameters, operating modes or welding programs set via the input and / or output device 22 are forwarded to the control device 4 and the individual components of the welding system or of the welding device 1 are subsequently controlled or corresponding setpoint values for the regulation or control are specified ,

Furthermore, in the illustrated embodiment, the welding torch 10 is connected via a hose package 23 to the welding device 1 or the welding system. In the hose package 23, the individual lines from the welding device 1 to the welding torch 10 are arranged. The hose package 23 is connected via a coupling device 24 to the welding torch 10, whereas the individual lines in the hose package 23 are connected to the individual contacts of the welding device 1 via connection sockets or plug connections. So that a corresponding strain relief of the hose assembly 23 is ensured, the hose package 23 is connected via a strain relief device 25 with a housing 26, in particular with the base housing of the welding device 1. Of course, it is possible that the coupling device 24 can also be used for the connection to the welding device 1.

In principle, it should be mentioned that not all of the above-named components have to be used or used for the different welding methods or welding devices 1, such as TIG devices or MIG / MAG devices or plasma devices. For this purpose, it is possible, for example, for the welding torch 10 to be used. ················ * *** + ζ can be performed as a fan cooled torch 10.

2 to 4, a wire feed device 27, which supplies the welding wire 13 to the welding torch 10, shown schematically and simplified in the assembled state. The wire conveying device 27 includes a tensioning device 28, a pressure lever 29 and a sliding block 30, wherein a pressure roller 31 is movably arranged in the pressure lever 29 and a drive roller 32 is arranged in or on the sliding block 30. The tensioning device 28, the pressure lever 29 and the sliding block 30 are arranged, for example, on a mounting plate 33 and firmly connected thereto.

The wire feed device 27 functions such that the welding wire 13 is guided through a preferably round opening 34 in the tensioning device 28 between the drive roller 32 and the pressure roller 31. The drive roller 32 is arranged in or on the shoe 30 and is preferably driven by a motor, not shown. In order to be able to convey the welding wire 13 by means of the drive roller 32, the pressure roller 31 is rotatably arranged in the pressure lever 29 on the side of the drive roller 32 opposite the welding wire 13. The pressure lever 29 is pivotally mounted via a pivot axis, in particular arranged in the mounting plate 33 guide pin 35. The pressure roller 31 arranged in the pressure lever 29 is mounted movably or rotatably and displaceably along a bolt 36. The bolt 36 or the receptacle of the bolt 36 is designed such that the bolt 36 can be easily removed for a role replacement. The guide pin 35 is arranged in the end region or edge region of the pressure lever 29, in order to achieve the largest possible radius, and thus the largest possible pivoting range. As a result, a secure delivery of the welding wire 13 is ensured.

In order to generate a pressure or a pressing force on the welding wire 13, so that the welding wire 13 is conveyed, the pressure lever 29 is pivoted about the guide pin 35 in the direction of the welding wire 13 until the pressure lever 29 arranged in the pressure roller 31 contacts the welding wire 13. In order to build up the pressure or the contact pressure on the welding wire 13 and

···························································································································································································································· pivoted to the tensioning device 28 mounted clamping bracket 37 in the direction of the pressure lever 29, which now fixes the pressure lever 29. The clamping bracket 37 and the pressure lever 29 have for this purpose at least one fixing device 57. The fixing device 57 may be formed by a arranged on the clamping bracket 37 bore 38 into which a pressure lever 29 arranged on the fixing pin 39 can engage. Thus, the clamping bracket 37 for fixing and pressurizing with the pressure lever 29 is connectable. Furthermore, on the pressure lever 29, a stop element 40 may be arranged, on which the clamping bracket 37 comes to rest when the pressure is applied. The pressure lever 29 with the pressure roller 31 arranged therein is pivoted in the direction of the welding wire 13 when the welding wire 13 is inserted and a pressure on the welding wire 13 is applied by means of the tensioning clamp 37. Thus, the welding wire 13 is conveyed due to the friction generated between the welding wire 13 and the rotating rollers, in particular, the drive roller 32 and the pressure roller 31.

In order to set the pressure or the contact pressure on the welding wire 13, a pressure adjustment device 41 is advantageously arranged. Thus, with different welding wires 13, an adjustment to the respective welding wire 13, in particular to the diameter and the material of the welding wire 13 can be made. The pressure adjustment device 41 is preferably arranged above and / or below the welding wire 13, in particular transversely to the welding wire 13.

The exact mode of operation of the individual elements of the wire feeding device 27 will be discussed in more detail in the following figures.

FIGS. 5 and 6 show a drive roller 32 with a neck element 42 and an intermediate piece 49.

The drive roller 32 in this case has a groove-shaped recess 43, which extends around the circumference of the drive roller 32 and serves to guide and promote the welding wire 13 or for transmitting power to the welding wire 13. In the center of the • · · · · · · · · · · ·

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Drive roller 32 and the attachment element 42 is further arranged a through the neck member 42 extending bearing bore 44 which is formed as a recess and through which the drive roller 32 and the neck member 42 can be arranged on a shaft 45. Furthermore, the attachment element 42 has an internal thread 46, which is arranged, for example, in the interior of the attachment element 42, that is to say in the bearing bore 44. At the inner thread 46 opposite side of the attachment element 42 and / or the drive roller 32 at least one centering surface 47 is arranged, which is preferably conical. Furthermore, at least one stop surface 48, which is preferably designed as a plane surface, may be arranged on the outside of the attachment element 42.

The neck element 42 can be screwed by means of the internal thread 46 on a korrespondierens thread. In order to achieve a centering of the attachment element 42 relative to the shaft 45 and / or an element arranged between the shaft 45 and the attachment element 42, for example an intermediate piece 49, the centering surface 47 is arranged on the attachment element 42. At least one centering surface 50 is also arranged on the shaft 45 and / or on the intermediate piece 49, whereby upon screwing on the attachment element 42 on the shaft 45 and / or on the intermediate piece 49, the centering surfaces 47, 50 contact one another and due to the conical arrangement of the centering surfaces 47 , 50 automatic centering and tensioning of the attachment element 42 on the shaft 45 and / or the intermediate piece 49 is ensured. The attachment element 42 can be screwed by means of a tool or else by hand by means of the stop surface 48. It is necessary that the torque for attaching the drive roller 32 is greater than the force which would cause a loosening of the drive roller 32 from the intermediate piece 49 in the wire promotion. The arrangement of the stop surface 48 on the opposite side of the drive roller 32 is a problem-free accessibility to the stop surface 48 by means of a tool given. Thus, the drive roller 32, in particular the indentation 43, is not damaged during assembly or when the drive roller 32 is exchanged. Furthermore, such an arrangement enables a simple and rapid assembly or replacement of the drive roller 32 ···················································································. ···· ························································································································································

The intermediate piece 4 9 according to the invention may be sleeve-shaped and pushed over the shaft 45.

In this case, the intermediate piece 49 has a slot 52 extending in the longitudinal direction of a main body 51 of the intermediate piece 49, which preferably extends over the entire length of the main body 51. The intermediate piece 49 is pushed or pushed onto the shaft 45. Furthermore, on the main body 51 of the intermediate piece 49, a member 53 for fixing the intermediate piece 49 to the shaft 45 is arranged. By pressing the fastening element 53, the slot 52 is compressed, whereby between the intermediate piece 49 and the shaft 45, a frictional connection is formed and the intermediate piece 49 rotatably connected to the shaft 45. The element 53 is formed in the illustrated embodiment as a screw connection. The intermediate piece 49 is thus pulled together by turning the element 53 and connected to the shaft 45. Of course, it is also possible to carry out the element 53 differently, for example by means of a continuous thread in the intermediate piece 49 arranged normal to the shaft 45 into which a screw, e.g. a worm screw is screwed in until contact with the shaft 45. Furthermore, an eccentric is possible, which compresses the slot 52 during rotation due to the eccentric arrangement and thus the rotationally fixed connection of the intermediate piece 49 is achieved with the shaft 45. Of course, all known from the prior art systems for rotationally fixed attachment of the intermediate piece 42 can be used on the shaft 45. Thus, a fastening of the drive roller 32 on the shaft 45 can be achieved in a simple manner. The position of the drive roller 32 on the shaft 45 can be easily changed, since only the element 53 of the intermediate piece 49 must be solved and the intermediate piece 49 is fixed to the shaft 45 after reaching the desired position. The fastening torque is advantageously chosen so that an interference fit between the shaft 45 and the intermediate piece 49 is achieved.

In order to allow easy mounting of the intermediate piece 49, ··························································································

It is possible to arrange at least one centering and / or plane surface on the main body 51, in particular on the inner surface of the main body 51 (not shown). Thus, the intermediate piece 49 rotatably on the shaft 45, which must then also have a centering and / or flat surface, are pushed and fixed on reaching the desired position only by means of the element 53. In this case, it is further possible to form the centering and / or plane surface of the shaft 45 in such a way that the centering and / or plane surface only extends along the shaft 45 so far that the intermediate piece 49 only has to be pushed and at the end of the Centering and / or plane surface is present and thus the desired position, in particular the required working height of the drive roller 32 is reached automatically.

Furthermore, a thread, in particular an external thread 54, may be arranged on the opposite side of the element 53 on the intermediate piece 49 or on the main body 51 of the intermediate piece 49.

On this external thread 54, the neck element 42 of the drive roller 32, by means of the corresponding internal thread 46, screwed. Thus, a means for attaching the drive roller 32 to the shaft 45 is formed by the internal thread 46 of the attachment element 42 and by the external thread 54 of the intermediate piece 49. Between the external thread 54 and the element 53, the centering surface 50 is arranged. The attachment element 42 is screwed onto the intermediate piece 49 until the centering surface 47 of the attachment element 42 and the centering surface 50 of the intermediate piece 49 touch each other. By tightening the attachment element 42 on the intermediate piece 49 with a certain torque, a rotationally fixed connection between the attachment element 42 and the intermediate piece 49 is achieved. The main body 51 of the intermediate piece 49 is formed on the outside as a molding for attachment by means of tools and / or the hand. This can be achieved by means of at least one abutment surface 48 designed as a plane surface into which a tool can engage. Thus, a simple and secure installation of the intermediate piece 49, and a simple change of the drive roller 32 is achieved.

The shaft 45 is advantageously directly to a drive, • · · · · · «· · · ···· ··· 11 'Λ.

In particular connected to an electric motor, wherein the drive may be formed by a known drive (not shown). Of course, it is also possible to arrange a transmission between the shaft 45 and the drive or the motor, whereby, for example, a lower or a translation can be achieved and thus a smaller motor for example, the same conveying speed could be used.

The main body 51 of the intermediate piece 49 may be connected directly to the shaft 45. Of course, it is also possible that the main body 51 with the interposition of a gear on the shaft 45 of a drive, in particular a drive motor, is arranged.

Claims (10)

· «♦ · · · · · · · · · ♦ ········ 1. Roller, in particular drive roller (32), for means (27) for conveying a welding wire (13). with a groove-like recess (43) and a bearing bore (44) for the arrangement of a shaft (45) in the center of the roller, in particular the drive roller (32), characterized in that a projection element (42) and a means for attachment to the shaft (45) is provided. 2. Roller according to claim 1, characterized in that the attachment element (42) has a central to the bearing bore (44) and at least partially through the attachment element (42) extending recess. 3. Roller according to claim 1 or 2, characterized in that the attachment element (42) is designed as a holding element and / or fastening element. 4. Roller according to one of claims 1 to 3, characterized in that the attachment element (42) preferably in the bearing bore (44) has an internal thread (46). 5. Roller according to one of claims 1 to 4, characterized in that at least one preferably conical centering surface (47) is provided. 6. Roller according to one of claims 1 to 5, characterized in that the outside of the attachment element (42) is designed for attachment by means of a tool and or or for dog operation. 7. Roller according to claim 6, characterized in that the outer side of the roller and / or the neck element (42) has a preferably designed as a flat surface stop surface (48). 8. Roller according to one of claims 1 to 7, characterized in that the attachment element (42) elements for attachment to a shaft (45) connected to the intermediate piece (49) - ** 13 · «· · · · · • ································································································································································ 9. Roller according to claim 8, characterized in that the intermediate piece (49) has a corresponding centering surface (50) and / or stop surface for positioning. 10. Roller according to one of claims 1 to 9, characterized in that the shaft (45) is connected directly or with the interposition of a transmission with a drive motor.