EP1458504B1 - Method and device for changing the rolls of a tube welding stand - Google Patents

Abstract

The invention relates to a method for changing sets of top rolls, lateral rolls, and a bottom roll, and mounted in chocks of a welding stand of a continuously operating longitudinal tube welding machine. The inventive method enables the rolls to be changed faster, using less appliances. Said method comprises the following steps: the top rolls are lifted; a dismantling/transport means is placed beneath the top rolls; the top rolls are lowered onto the dismantling/transport means and deposited on the same; and, once the top rolls have been removed, the dismantling/transport means is laterally withdrawn.

Description

The invention relates to a method and a Längsnahtrohrschweißmaschine with a device for changing consisting of upper rollers, side rollers and a lower roller mounted in chocks of a framework of a continuous Längsnahtrohrschweißmaschine sets of rollers, the upper rollers are hochfahrbar, as known from JP 59199113 A.

A large part of steel and other metal tubes is produced by continuous longitudinal welding. For this purpose, a tape is unwound from a coil, formed in several rolling stands to form a round slotted tube and welded. For the purpose of assembly, the strip edges are heated to welding temperature and compressed in a welding stand so that they weld together. The rollers of these scaffolds must be changed frequently, either with a change in the pipe diameter or with advanced wear. The time to change the rollers must be kept as short as possible to avoid unwanted downtime. The roll change should not least be carried out for cost reasons with a small amount of technical and mechanical aids and manual handling.

Smaller pipe welding machines usually have rollers and chocks with low weights, so that the internals are often changed by hand. In welding machines for large pipes, for example, from 600 mm pipe diameter upwards, a change by hand is no longer possible and it will require appropriate mechanical tools. In one known from DE-AS 1 602 315 method of roll change, the rollers are individually attached to a rope and by means of a hoist from the Machine lifted out. In order to release the rollers from the roll stand, a thru-axle must first be pulled out. The thru-axle and its connection to the roller, however, requires a complex construction. The individual replacement of the rollers and the time-consuming impact on a crane hook, for example, also causes a long interruption of production.

Another prior art is known from DE-OS 34 23 706. In order to carry out the change from one to another tube dimension in a short time, here four rolling stands in different dimensions are available and arranged in the form of a turnstile on the machine bed. If the pipe dimension changes, the turnstile is turned further into the appropriate pitch until the new kit is put into position. Although this type of change is time-saving, but requires an extremely high equipment cost.

The invention has for its object to provide a method and an apparatus with which a roll change can be realized easily and quickly and with a low equipment cost.

• Einbringen eines Ausbau-Transportmittels unter die hochgefahrenen Oberwalzen
• Absenken und Absetzen der Oberwalzen auf das Ausbau-Transportmittel
• Anheben der Seitenwalzen und der Unterwalze an das Ausbau-Transportmittel, bis Zentrierungen von Seitenwalzhaltem in Zentrieröffnungen des Ausbau-Transportmittels eingreifen, und
• nach dem Lösen der Oberwalzen seitliches Herausfahren des Ausbau-Transportmittels mit dem kompletten Walzensatz.

This object is achieved by a method which is characterized by

• Inserting a removal means of transport under the raised top rollers
• Lowering and depositing the top rollers on the removal means of transport
• Lifting the side rollers and the lower roller to the dismantling transport means, until centerings of side roller stops engage in centering openings of the dismantling transport means, and
• after loosening the top rollers lateral retraction of the removal means of transport with the complete set of rollers.

With the above-mentioned method steps, a quick and cost-effective change of the entire rolls due to the low mechanical complexity is advantageously achieved, so that it is in particular possible to carry out the conversion when changing from one pipe dimension to another in the shortest possible time, the conversion hardly occurring requires manual intervention.

• daß die Oberwalzen in Führungen gelagert und motorisch anstellbar sind,
• daß das Ausbau-Transportmittel als Brücke ausgebildet ist, die einseitig einen auf einer Führungsschiene angeordneten Oberwalzenwagen übergreift und auf diesem verschiebbar angeordnet ist sowie mit einem vorkragenden Arm die Oberwalzen untergreift, und
• daß dem Oberwalzenwagen mit der Brücke eine außerhalb des Schweißgerüstes vorgesehene Verschiebevorrichtung zugeordnet ist.

An apparatus for carrying out the method according to the invention provides

• that the upper rollers are mounted in guides and are motor-adjustable,
• in that the removal transport means is designed as a bridge, which engages on one side a top roller carriage arranged on a guide rail and is displaceably arranged on the latter and engages with a cantilever arm under the top rollers, and
• in that the top roller carriage with the bridge is assigned a displacement device provided outside the welding frame.

Here, the top rollers are driven with their guides on, for example, motor-driven Spindelhubelemente in an upper expansion position. Then, the bridge guided on the top roller carriage is moved by means of the movable, for example via a motor / spindle combination displacement device from the side so far into the mill until the bridge engages with their profile L-shaped arms the top rollers. After the top rollers are seated on the bridge, the bridge is pushed out of the framework by means of the displacement device until it is freely accessible laterally next to the framework. Here the top rollers can then be exchanged for another set of rollers.

A further embodiment of the invention provides for the removal of the upper rollers together with the side rollers and the lower roller, that the side rollers are mounted in side roller holders and are motorized and the side holder are formed with centerings for the bridge supporting the upper rollers.

The side rollers with their Seitenwalzenhaltem be moved so far apart, for example, also motor-driven Spindelhubelemente until the centerings are with the complementary engagement openings of the upper rollers supporting bridge in the covering position. Subsequently, the arranged on a height-adjustable table lower roller is raised. Along with this, the side roll holders are raised above the chocks of the lower roll until the side roll holders sit under the bridge and support it. The centering of the side roller holders are now in engagement with the openings in the bridge and lock them secure against movement. Subsequently, on the one hand, the side rollers are decoupled from their adjusting devices and, on the other hand, the guides are released from the upper rollers. Thus, now the entire replacement kit, comprising the bridge with the top rollers placed thereon, the side rollers with their holders and the lower roller, laterally pushed out of the scaffolding by a Ausschiebevorrichtung and there completely exchanged for a new set of rollers.

Fig. 1

einen allgemeinen Aufbau eines Schweißgerüstes einer Rohrschweißmaschine in der Vorderansicht dargestellt;

Fig.2,4,5 und 6

jeweils das Schweißgerüst in der Vorderansicht dargestellt, anhand der aufeinanderfolgenden Figuren der Verfahrensablauf eines Walzenwechsels des gesamten Walzensatzes gezeigt wird;

Fig. 3

eine Oberwalze des Schweißgerüstes als Teilausschnitt von der Seite her gesehen; und

Fig. 7

das Schweißgerüst der Rohrschweißmaschine mit hier lediglich ausgebauten Oberwalzen, in der Vorderansicht dargestellt.

Further features and details of the invention will become apparent from the claims and the following description of Dagestellten in the drawings embodiments of the invention. Show it:

Fig. 1

a general structure of a welding frame of a pipe welding machine shown in front view;

Figs. 2, 4, 5 and 6

each showing the welding stand in the front view is shown on the successive figures of the procedure of a roll change of the entire set of rolls;

Fig. 3

a top roll of the welding stand seen as a partial section from the side; and

Fig. 7

the welding frame of the pipe welding machine with here only removed top rollers, shown in front view.

In Fig. 1, a welding frame 1 a pipe welding machine in the longitudinal direction of a pipe 2 is shown. The welding frame 1 consists of the two top rollers 3, 4, the side rollers 5, 6 and the bottom roller 7. The top rollers 3, 4 are mounted in guides 8 and are a motor-gearbox combination 9 and a motor-driven Spindelhubelement 10 - jobs 9 and 10 - hired. The side rollers 5, 6 are mounted in Seitenwalzenhaltem 11 and are employed via a motor-spindle combination 12. The lower roller 7 is mounted in chocks 13, which are arranged on a movable over a height adjustment 14 table 15. The entire set of rollers is shown in FIG. 1 in working position.

To remove the entire roller assembly, as shown in FIG. 2, the upper rollers 3, 4 are moved via the motor-operated jobs 9, 10 in an upper expansion position in a first step. Subsequently, a bridge 16, which is movably clamped on a top roller carriage 17 (see FIG. 3), is moved from the side into the position shown below the top rollers 3, 4 via a spindle-operated displacement device 18. Subsequently, the top rollers 3, 4 are lowered with their guides 8 by means of their motor-operated jobs 9, 10 on the bridge 16, wherein the top rollers 3, 4 supported on the bridge 16 on the one hand with an overarching Einhakleiste 19 and rest on the other hand with their guides 8 on a projecting, in cross-section L-shaped, an additional support bidding arm 20 of the bridge 16. The bridge 16 and the top roller 17 are arranged on a support rail 21, which is encompassed by the upper roller carriage 17 (see Fig. 3). At the same time the side rollers 5, 6 are moved apart with their Seitenwalzenhaltem 11 on the jobs 12. When reaching the change position are arranged on the Seitenhaltem 11 centerings 22 with height distance in cover position with complementary centering 23 of the bridge 16th

In a further step, as shown in Fig. 4, the table 15 is raised with the lower roller 7 via the height adjustment 14 to the level of a scaffolding plate 24. In addition, at the same time the side rollers 5, 6 are lifted with their Seitenwalzenhaltem 11 arranged on the chocks 13 of the lower roller 7 Kragarmen 25. The side roller holder 11 sit down supporting the bridge 16, wherein the centering 22 engage in the centering openings 23 of the bridge 16.

Fig. 5 shows the roll expansion phase in which the guides 8 are released from the top rollers 3, 4 and raised by means of the jobs 9, 10. The complete set of rollers is thus prepared for lateral retraction from the framework 1, where it is from a waiting in place, with its surface at a height with the framework plate 24, on which the set of rollers is slidably displaced, wherein the bridge 16 guided on the Support rail 21 with displaced, extending roll changing carriage 26 can be added. The change carriage 26 can be optionally (not shown) equipped with a prepared new set of rolls, so that after the removal of the used set of rolls by eg a transversely to the frame 1 to be performed sliding movement of the new set of rolls in position for installation in the framework and at the same time the old set of rolls is moved to a position from which, for example, a hall crane can undertake the removal.

FIG. 6 now shows the roll change set 27 pushed onto the change carriage 26 by a push-out device 28. When the roll set 27 is removed, the bridge centered on the side roll holders 11 becomes. 16 pushed down with the seated top rollers 3, 4 of the remaining on the support rail 21 in its position upper roller carriage 17. The change carriage 26 can now - as previously mentioned - moved in the longitudinal direction parallel to the welding stand and a new set of rolls are brought into position, which is then installed in reverse order to the above-described expansion in the welding frame 1.

Notwithstanding the previously described expansion of the entire set of rollers is shown with reference to FIG. 7, a removal of only the upper rollers 3, 4, which wear faster than the side rollers 5, 6 and the lower roller 7. In this case, the side rollers 5, 6 and the lower roller 7 need not be raised, but they remain in working position. Instead, only the upper roller carriage 17 carrying the bridge 16 is displaced so far on the rail 21 by means of the displacement device 18 that the bridge 16 with the top rollers 3, 4 resting on it comes into a freely accessible position protruding from the frame 1. Here, the top rollers 3, 4 can then be easily replaced with a new set of rollers.

Claims (5)

1. A method for changing roller sets that include upper rollers (3, 4), lateral rollers (5, 6) and a lower roller (7) and are supported in installation elements on a stand (1) of a continuously operating longitudinal seam pipe welding mill, wherein the upper rollers (3, 4) are raised, characterised by

   a) moving a disassembly transport means (16) under the raised upper rollers (3, 4),

   b) lowering and depositing the upper rollers (3, 4) onto the disassembly transport means (16),

   c) lifting the lateral rollers (5, 6) and the lower roller towards the disassembly transport means (16) until centring mechanisms (22) on lateral roller retainers (11) engage in centring holes (23) in the disassembly transport means (16) and

   d) withdrawal of the disassembly transport means (16) with the complete roller set after the upper rollers (3, 4) have been released.
2. A longitudinal seam pipe welding mill having a device for changing roller sets that include upper rollers (3, 4), lateral rollers (5, 6) and a lower roller (7) and are supported in installation elements on a stand (1) of a continuously operating longitudinal seam pipe welding mill, wherein the upper rollers (3, 4) can be raised, particularly to carry the method according to claim 1,
   characterised in that

   - the upper rollers (3, 4) are supported in guides (8) and are adjustable with a motor,

   - the disassembly transport means is constructed as a bridge (16) that grasps from above an upper roller carriage (17) arranged on a carrier rail (21) and is displaceable thereon, and grasps the lower rollers (3, 4) from below with a projecting arm (20), and

   - that a displacement device (18) provided outside the welding stand (1) is attached to the upper roller carriage with the suspended bridge (16).
3. The longitudinal seam pipe welding mill in accordance with claim 2,
   characterised in that
   the lateral rollers (5, 6) are supported in lateral roller retainers (11) and are adjustable via a motor, and the lateral retainers are constructed with centring mechanisms (22) for the bridge (16) that bears the upper rollers (3, 4).
4. The longitudinal seam pipe welding mill in accordance with either of claims 2 or 3,
   characterised in that
   the lower roller (7) is arranged on a height-adjustable table (15).
5. The longitudinal seam pipe welding mill in accordance with any of claims 2 to 4,
   characterised in that
   the complete installation changing assembly (27), comprising the bridge (16) with the upper rollers (3, 4) deposited thereon, the lateral rollers (5, 6) and the lower roller (7) is able to be acted upon by an ejection device (28).

Images