Rolling mill for rolling metal, wire or tube along rolling axis

Abstract

The utility model relates to a rolling mill for rolling metal bars, wires or pipes along a rolling axis, which comprises two or more racks which are arranged one by one along the rolling axis and are received in a rack base under each condition. Wherein each of the stands comprises three rollers, which are positioned in each case on a roller shaft, surround the rolling axis in a star-shaped manner and together form an aperture, wherein at least two of the three roll shafts of each of the stands are operatively connected in each case to a drive unit. The drive unit includes: a motor having a motor shaft; and a gearbox having a Z-shaped gearbox housing and having a drive shaft coupled to the motor shaft, and having an output shaft offset parallel to the drive shaft and coupled to the roll shaft.

Description

Technical Field

[0001] The utility model relates to a rolling mill for rolling metal bars, wires or tubes along a rolling axis. The rolling mill comprises a plurality of stands which are arranged one after another along the rolling axis and are respectively received in stand bases. Each stand comprises three rolls which are in each case positioned on roll shafts and surround the rolling axis in a star shape, and the three rolls together form a pass. Background Art

[0002] In principle, rolling mills for rolling bar-shaped materials to be rolled are known in the production of metal tubes, bars or wires. In this case, the material to be rolled can be rolled into a desired diameter by correspondingly setting the pass. The stands for such rolling mills are known, for example, from DE 100 15 340A1.

[0003] Generally, a plurality of stands are arranged successively in a rolling mill. Therefore, the material to be rolled can be stretched specifically by the difference between the roll speeds of the respective stands and rolled into a smaller diameter.

[0004] In addition, the roundness of the material to be rolled after passing through one stand is usually insufficient because the cross-section has a polygonal shape due to the rolls generally being arranged in a star shape and their relatively small number, and the number of sides of the polygon corresponds to the number of rolls of the stand. For example, the cross-sectional shape of the material to be rolled rolled by a single three-roll stand is not an ideal circle but approximately triangular.

[0005] To improve the roundness of the material to be rolled, the successive stands are preferably arranged such that in each case, the corners of the cross-section of the material to be rolled leaving the stand come into contact with the rolls of the subsequent stand at the central position, and thus the cross-section of the material to be rolled becomes round.

[0006] Therefore, in each case, three rolls (for example, the first and third stands of a rolling mill with four stands) are usually positioned in a so-called "Y arrangement", while in each case, the rolls of the stands arranged behind the first and third stands (for example, the second and fourth stands) are arranged in a so-called "reverse Y arrangement" ( ). Since the rolls and stands are arranged alternately in a Y arrangement and a reverse Y arrangement, in each case, the corners of the cross-section of the material to be rolled are rolled by the rolls of the subsequent stand, and thus the cross-section of the material to be rolled becomes round.

[0007] In a Y-shaped arrangement, the lower rolls are oriented such that their roll axes are horizontally positioned when viewed in the direction of the rolling axis, i.e., the diameters of the lower rolls extend vertically. In contrast, in an inverted Y-shaped arrangement, it is the roll axes of the upper rolls that are horizontally positioned when viewed in the direction of the rolling axis, i.e., the diameters of the upper rolls extend vertically. In both cases, the roll axes of the two additional rolls are positioned at an angle of 120° relative to the horizontal roll axis in each case. Of course, the arrangement relative to the horizontal direction is generally arbitrary, since for the effects described here, only the relative arrangement of the rolls with respect to adjacent stands is important.

[0008] Roll stands are typically arranged one after another using a stand base to form a rolling mill. The roll stands are placed into the stand base and fixed by the stand base. This allows for the replacement of roll stands in the rolling mill, for example, for the purpose of regular maintenance as required.

[0009] The rolls are typically arranged on the roll axes in a press fit and are driven by the drives of the roll axes. For this purpose, there is the concept of driving each roll axis separately by means of an individual drive, or the concept of driving multiple roll axes together by means of a single drive via a corresponding gearbox. The present utility model relates to the concept of driving the roll axes separately by means of individual drives in each case.

[0010] With this concept, the difficulty lies in the fact that a very large amount of installation space is required to accommodate a plurality of drive motors and the corresponding reduction gears. In this case, the problem is particularly that the motors must be arranged at a relatively large distance from the rolling axis in order to have sufficient spacing between each other. Summary of the Utility Model

[0011] Against this background, the object of the present utility model is to construct a rolling mill for rolling metal bars, wires or tubes along a rolling axis, the body of which is constructed in a space-saving manner as much as possible. Specifically, the object of the present utility model is to additionally construct the rolling mill in such a way that the resources required for the production and installation of the rolling mill are as few as possible without compromising the performance of the rolling mill (especially with respect to the rolling performance during the operation of the rolling mill).

[0012] A preferred rolling mill for rolling metal bars, wires or tubes along a rolling axis includes two or more stands, which are arranged one after another along the rolling axis and each received in a stand base. In this case, each of the three stands includes three rolls, which are in each case positioned on roll shafts and surround the rolling axis in a star shape, and the three rolls together form a pass. At least two of the three roll shafts of each stand are in each case operably connected to a drive unit. The drive unit includes a motor having a motor shaft and includes a gearbox having a Z-shaped gearbox housing, having a drive shaft preferably flush with and coupled to the motor shaft and including an output shaft offset parallel to the drive shaft and preferably flush with and coupled to the roll shaft.

[0013] In this case, the drive unit of at least one of the roll shafts of each stand in each case is configured in a first configuration, in which a part of the drive shaft protruding outwards from the gearbox housing, or a part of the motor shaft and a part of the output shaft protruding outwards from the gearbox housing, or a part of the roll shaft are in each case arranged axially overlapping a part of the gearbox housing. Additionally, the drive unit of at least another of the roll shafts of each stand in each case is configured in a second configuration, in which a part of the drive shaft protruding outwards from the gearbox housing and the motor shaft and a part of the output shaft protruding outwards from the gearbox housing and the roll shaft are arranged not axially overlapping with respect to the gearbox housing.

[0014] In each case, the gearbox of the drive unit includes a Z-shaped gearbox housing, which allows both a radial offset of the drive shaft with respect to the axis of the output shaft between two parallel axes and an offset along the axes of the two parallel axes.

[0015] The Z-shaped design of the gearbox housing enables the gearbox to be arranged in different configurations such that, depending on the requirements, a particularly small spacing between the motor shaft coupled to the gearbox and thus also to the motor itself and the output shaft coupled to the gearbox and thus also to the roll shaft of the stand can be achieved thereby. This is the case in the first configuration, in which an axially overlapping arrangement is adopted between the gearbox housing and the corresponding coupling parts of the shafts coupled to the gearbox or the drive and output shafts. Due to the axial overlap, the gearbox is connected such that, in the axial direction observed along the axis of the roll shaft and thus also the motor shaft, there is hardly any increase (if any) in the installation space requirement.

[0016] However, in the second configuration, the Z-shaped housing can also be arranged such that the gearbox is arranged in its axially extended state between the roll shaft and the motor shaft, and thus results in a relatively large spacing on the one hand between the motor shaft (and thus the motor) and the roll shaft and on the other hand between the motor shaft and the stand.

[0017] The fact that the output shaft is flush with the roll shaft makes this part of the torque gearbox less susceptible to interference and enables a high degree of stability. However, a non-flush alignment of the cardan shaft and the roll shaft and the associated output shaft, as well as the motor shaft and the associated drive shaft, is also possible.

[0018] Preferably, the third roll shaft of the three roll shafts of each of the stands is also operatively connected to such a drive unit, which drive unit comprises a motor having a motor shaft and a gearbox having a Z-shaped gearbox housing and having a drive shaft flush with and coupled to the motor shaft and having an output shaft offset parallel to the drive shaft and coupled to the drive shaft. In this case, the drive unit is preferably configured in a first configuration or in a second configuration as defined and described above.

[0019] Preferably, the roll shafts of adjacent stands are oriented parallel to each other and arranged offset relative to each other perpendicular to the rolling axis. In this case, all drive units operatively connected to these roll shafts oriented parallel to each other are in each case configured in a first configuration or in a second configuration.

[0020] Specifically, in the case where adjacent stands change between a Y-shaped arrangement and an inverted Y-shaped arrangement, the roll shafts can be arranged in a manner that can be switched in parallel such that the rolls positioned on the respective shafts alternately roll the material to be rolled from opposite sides and in opposite directions. The drive units of the parallel roll shafts are configured in the same way, namely in a first configuration or in a second configuration, thus enabling efficient use of space. In addition, this enables, in the case where the drive units are arranged above the stands, an overall relatively low installation height above the entire rolling mill and not just above a single stand at the same high clearance height next to the stands. In the case where the drive units are arranged below the stands, a more uniform and relatively large spacing of the gearbox housing and the motor from the stand housing is possible, such that there is sufficient space for peripheral devices, such as in particular a track system for a stand changing carriage, or other devices and machines for lateral access to the stands. The same gearbox housing can meet these two seemingly contradictory requirements, and thus, due to the multi-functional use of the individual components, the use of this rolling mill can be very flexible and can be highly cost-effective during the production process.

[0021] In this case, it is particularly preferred that the drive units of adjacent stands operatively connected to roll shafts oriented parallel to each other are in each case oriented such that the output shafts are alternately offset in opposite directions relative to the drive shafts. Thus, the above-mentioned efficient use of space can be achieved simultaneously, and the motors of the drive units can be spaced relatively far apart from each other, even close to the rolling axis, which enables the motors to be formed relatively large and to be arranged relatively close to the rolling axis.

[0022] Preferably, in each case the first roll shaft of the three roll shafts of each stand is oriented such that the drive unit operatively connected to the first roll shaft is located above the stand. In this case, the drive unit operatively connected to the first roll shaft of the three roll shafts is configured in a first configuration so as to achieve a smaller installation height of the rolling mill above the rolling axis and, in this case, simultaneously achieve a relatively large clearance height for personnel or peripheral devices at the side of the rolling mill.

[0023] In this case, it is particularly advantageous that the motor of the drive unit operatively connected to the first roll shaft of the three roll shafts is mounted on the gearbox housing of the respective drive unit by means of a bracket. Since the gearbox housing has a Z-shaped shape and is inclined and arranged above the rolling mill, the gearbox housing may not require any additional crossbeams to provide support, but rather at least partially bears the gearbox itself, preferably also bearing the associated motor.

[0024] The gearbox housings can together form a supportless bridge for arranging gearboxes arranged side by side. In other words, the gearbox housings do not require their own steel crossbeams. At least some of the weight loads of the respective motors can also be absorbed by the gearbox housings. Preferably, the motors can be supported both by the gearbox housings and by one or more additional supports.

[0025] In a preferred embodiment, in each case the second roll shaft of the three roll shafts of each stand is oriented such that the drive unit operatively connected to it is located below the stand. In this case, the drive unit operatively connected to the second roll shaft of the three roll shafts is configured in a second configuration so as to achieve a relatively large clearance below the stand for peripheral components.

[0026] The peripheral components can in particular be a track system for a stand-changing carriage. The stand-changing carriage is a carriage for simultaneously changing a plurality of stands, for example for using or quickly adjusting to another material to be rolled. Thus, the stand-changing carriage exerts a very high load on the ground and is therefore preferably moved on a track system. The track system requires floor-mounted space, which can be smoothly bridged with the arrangement of the drive units in the second configuration.

[0027] For a preferred rolling mill, in each case the third roll shaft of the three roll shafts of each stand is horizontally oriented such that the drive unit operatively connected to the third roll shaft is located beside the stand.

[0028] In this case, the drive unit operatively connected to the third roll shaft can be configured in a second configuration so as to achieve a larger spacing between the motors of the drive units of adjacent stands.

[0029] Alternatively, the drive unit operatively connected to the third roll shaft can be configured in a first configuration so as to achieve a small installation space next to the stand. Thus, depending on the installation situation, various advantages of the first and second configurations of the drive unit can be utilized. This emphasizes the high flexibility achieved through the specific Z-shaped gearbox housing and the preferred arrangement and orientation of the drive unit.

[0030] In a preferred embodiment, in addition to the drive shaft and the output shaft, the gearbox housing further includes at least one intermediate shaft. The particularly distinct Z-shaped shape of the gearbox housing can be achieved by the intermediate shaft, and this shape enables the gearbox housing to particularly easily provide a rolling mill with a particularly flexible configuration in the above-described manner.

[0031] In addition to the drive shaft and the output shaft, the gearbox preferably further includes an intermediate shaft and a switching shaft.

[0032] The stand of the rolling mill or the stand housing of all stands preferably has a hexagonal outer shape as observed along the rolling axis. Thus, the stand can be easily received in the stand base in a Y-shaped arrangement and an inverted Y-shaped arrangement, and the drive unit whose position and orientation must follow the position and orientation of the roll shaft can be arranged in a particularly advantageous manner. This particularly applies to additional peripheral devices, such as remote adjustment members for the rolls. If the hexagonal outer shape of the stand is cleverly selected for different arrangements and configurations of the stand, the arrangements and orientations of these rolls can be maintained or substantially maintained.

[0033] Further advantages and developments of the present utility model become apparent from the following description of the drawings and all the claims. Description of the Drawings

[0034] Figure 1 is a schematic view of a preferred rolling mill including a drive unit as observed along the rolling axis.

[0035] Figure 2 is Figure 1 a schematic view of the stand of the rolling mill including the drive unit in a Y-shaped arrangement.

[0036] Figure 3 is Figure 1 a schematic view of the stand of the rolling mill including the drive unit in an inverted Y-shaped arrangement.

[0037] Figure 4 is Figure 3 a partial cross-sectional view of the stand. Detailed Description of the Embodiment

[0038] Figure 1 is a schematic view of a preferred rolling mill 100 including drive units 80.1, 80.2, 80.3 as observed along the rolling axis. Thus, it can be seen from the view of this figure that the rolling axis extends perpendicular to the image plane.

[0039] In the center of the figure, a stand 1 is shown, which includes a stand housing 10 having a hexagonal outer shape. The outer shape represents a regular hexagon, and the stand 1 is positioned on one side of the hexagon horizontally oriented. The stand 1 includes three rolls 20.1, 20.2, 20.3, and each of the three rolls defines a rolling plane in which the periphery of the rolls 20.1, 20.2, 20.3 extends. Each of the rolls 20.1, 20.2, 20.3 is positioned on roll shafts 22.1, 22.2, 22.3 that extend mainly perpendicular to the rolling plane. The rolls 20.1, 20.2, 20.3 surround the rolling axis in a star shape and thus form an aperture 21 through which the material to be rolled is guided during rolling.

[0040] The star arrangement of the rolls 20.1, 20.2, 20.3 is shown in a so-called inverted Y-shaped arrangement in Figure 1 This name stems from the fact that the rolling planes of the rolls 20.1, 20.2, 20.3 are positioned as vertical planes above the aperture 21, and there are two planes that are each inclined at an angle of 120° relative to the vertical plane. When viewed from the observation direction along the rolling axis, the shape is similar to the letter Y upside down. In contrast, Figure 2 the stand 1 shown in is shown in a so-called Y-shaped arrangement because here the vertical rolling plane is located below the aperture 21, and the arrangement of the rolling planes observed along the rolling axis thus has a shape similar to the letter Y.

[0041] Figure 1 the stand 1 visible in Figure 1 and the stand 1 hidden one after another flush along the rolling axis and thus in Figure 1 are each received in a stand base 70, which partially surrounds the relevant stand 1 from the left side of the perspective view of . The lower edge, side edges, and upper edge of the stand 1 are received by the stand base. In this case, four of the six side surfaces 14.1, 14.2, 14.3, 14.4, 14.5, 14.6 of the regular hexagon described by the outer shape of the corresponding stand 1 are surrounded by the associated stand base 70, and the side surfaces are adjacent.

[0042] The rolls 20.1, 20.2, 20.3 are attached to the roll shafts 22.1, 22.2, 22.3 in a gapless manner, for example, pushed or shrunk onto the roll shafts 22.1, 22.2, 22.3 in a press-fit manner, and are driven by driving the roll shafts 22.1, 22.2, 22.3. To drive the roll shafts 22.1, 22.2, 22.3, the rolling mill 100 has drive units 80.1, 80.2, 80.3.

[0043] Each of the drive units 80.1, 80.2, 80.3 drives the roll shafts 22.1, 22.2, 22.3 and thus drives the rolls 20.1, 20.2, 20.3. For this purpose, each drive unit 80.1, 80.2, 80.3 includes: motors 81.1, 81.2, 81.3 having motor shafts; and gearboxes 82.1, 82.2, 82.3 having Z-shaped gearbox housings 83.1, 83.2, 83.3, drive shafts 84.1, 84.2, 84.3 flush with and coupled to the motor shafts, and output shafts 86.1, 86.2, 86.3 offset parallel to the drive shafts 84.1, 84.2, 84.3 and flush with and coupled to the roll shafts 22.1, 22.2, 22.3.

[0044] Couplings 88.1, 88.2, 88.3 are located on the frame 1, and the output shafts 86.1, 86.2, 86.3 of the drive units 80.1, 80.2, 80.3 can be coupled to the roll shafts 22.1, 22.2, 22.3 via the couplings. In this case, the roll shafts 22.1, 22.2, 22.3 or the output shafts 86.1, 86.2, 86.3 can also be composed of multiple partial shafts. The fact that the output shafts 86.1, 86.2, 86.3 are flush with the roll shafts 22.1, 22.2, 22.3 makes this part of the torque gearbox less susceptible to interference and improves stability. However, it is also conceivable to provide universal shafts.

[0045] In Figure 1 the embodiment shown, the output shafts 86.1, 86.2, 86.3 are formed by two parts and include a first part extending between the frame 1 including the couplings 88.1, 88.2, 88.3 of the roll shafts 22.1, 22.2, 22.3 and the Z-shaped gearbox housings 83.1, 83.2, 83.3. In addition, the output shafts 86.1, 86.2, 86.3 include a second part extending from the first part of the output shafts 86.1, 86.2, 86.3 into the gearbox housings 83.1, 83.2, 83.3.

[0046] Corresponding to the number of three roll shafts 22.1, 22.2, 22.3 for each frame 1, three drive units 80.1, 80.2, 80.3 are arranged in each case such that the roll shafts 22.1, 22.2, 22.3 are flush around the frame 1. In this case, in Figure 1 the perspective view, for each frame 1, the first drive unit 80.1 is arranged in the upper right of the frame, the second drive unit 80.2 is arranged in the lower right of the frame, and the third drive unit 80.3 is arranged on the left side of the frame at approximately the same height.

[0047] The first drive unit 80.1 is configured in a first configuration. In this configuration, a second portion of the output shaft 86.1 extends at least partially adjacent to a portion of the gearbox housing 83.1 before entering the gearbox housing 83.1. Thus, a portion of the output shaft 86.1 enters the gearbox housing 83.1 at a distance from the rolling axis, and thus extends at least partially in an axially overlapping manner with a portion of the gearbox housing 83.1. This configuration of the Z-shaped gearbox housing 83.1 causes an offset between the output shaft 86.1 and the drive shaft 84.1, such that the distance between the motor 81.1 of the first drive unit 80.1 and the rolling axis is small. Due to this offset, in the first configuration, the gearbox housing 83.1 reduces the distance between the motor 81.1 of the drive unit 80.1 and the frame 1 or the rolling axis.

[0048] The second drive unit 80.2 is configured in a second configuration. In this configuration, a second portion of the output shaft 86.2 does not extend beside the gearbox housing 83.2 before entering the gearbox housing 83.2. In this regard, the second configuration is an orientation opposite to the Z-shape of the gearbox housing 83.2, such that the distance between the motor 81.2 of the second drive unit 80.2 and the rolling axis is large. Due to this offset, in the second configuration, the gearbox housing 83.2 increases the distance between the motor 81.2 of the drive unit 80.2 and the frame 1 or the rolling axis.

[0049] Although the Z-shape of the gearbox housing 83.2 of the second drive unit 80.2 implies a compact structure, i.e., when the length of the first portion of the output shaft 84.2 is the same as that in the second configuration, the motor of the second drive unit 80.2 is arranged relatively close to the rolling axis and the frame 1, the Z-shape of the gearbox housing 83.2 of the second drive unit 80.2 also results in a space-consuming structure, where when the length of the first portion of the output shaft 86.2 is the same as that in the first configuration, the motor 81.2 of the second drive unit 80.2 is arranged relatively far from the rolling axis and the frame 1.

[0050] For the second drive unit 80.2, the larger distance is advantageous because in this way, the installation space of the track system 90 for the frame replacement carriage 92 in the ground can be smoothly bridged without extending the shaft and thus increasing the dynamic instability. For the first drive unit 80.1, the smaller distance is advantageous because in this way, the installation height of the rolling mill 100 upwards can be kept small.

[0051] Similar to these cases of the second drive unit 80.2, in Figure 1In the embodiment shown, the gearbox housing 83.3 of the third drive unit 80.3 is configured in a second configuration such that when the output shaft 86.3 has the same length, the spacing between the motor 81.3 of the third drive unit 80.3 and the corresponding frame 1 and the rolling axis is increased by the gearbox housing 83.3.

[0052] The first configuration of the Z-shaped gearbox housings 83.1, 83.2, 83.3 (a part of the output shafts 84.1, 84.2, 84.3 is axially overlapped with the gearbox housing 83.1) and the second configuration of the Z-shaped gearbox housings 83.1, 83.2, 83.3 (the output shafts 84.1, 84.2, 84.3 are non-overlapped (i.e., no overlap) with the gearbox housings 83.1, 83.2, 83.3) cause the gearbox housings 83.1, 83.2, 83.3 to either increase the spacing between the corresponding motors 81.1, 81.2 and the frame 1 or cause the extension of the gearbox housings 83.1, 83.2, 83.3 along the orientation of the roll shafts 22.1, 22.2, 22.3 to be almost or completely compensated by the Z-shaped shape.

[0053] In addition, the orientations of the first drive unit 80.1 and the second drive unit 80.2 of the successive frames 1 (i.e., the frames 1 positioned one after another along the rolling axis) are different from the orientation of the third drive unit 80.3.

[0054] The gearbox housings 83.1, 83.2 of the first drive unit 80.1 and the second drive unit 80.2 of the adjacent frames 1 are oriented such that the positions of the motors 81.1 of the first drive unit 80.1 of the adjacent frames 1 are close to each other. In other words, the gearbox housing 83.1 is guided towards each other along the peripheral direction of the rolling axis. The same is true for the second drive unit 80.2 of the adjacent frames 1. Thereby, at the height of the motors 81.1, 81.2, a relatively small spacing is achieved between the motors 81.1, 81.2 along the periphery around the rolling axis, which is advantageous for the installation space requirements of, for example, the motor 81.1 of the first drive unit 80.1 and the motor 81.2 of the second drive unit 80.2.

[0055] By means of Figure 1 the configuration of the Z-shaped gearbox housing 83.1 shown, the first drive unit 80.1 forms a self-supporting bridge so that it can be placed on both sides of the support and does not require any additional steel crossbeam. In this case, the gearbox housing 83.1 is preferably self-supporting and can, in addition, absorb at least a part of the gravity of the motor 81.1.

[0056] In contrast, the gearbox housings 83.3 of the third drive units 80.3 of the successive stands 1 are arranged such that they are guided away from each other in the peripheral direction of the rolling axis, enabling a relatively large spacing between the adjacent motors 81.3, so that the upper motors 81.3 of the rolling mill 100 can be mounted on a solid support without affecting the lower motors 91.3. However, alternatively, the third drive units 80.3 can also be configured in a manner similar to the first drive unit 80.1 or the second drive unit 80.2.

[0057] Figure 1 The gearbox change carriage 92 and the track system 90 for the gearbox change carriage 92 are schematically shown. In principle, the gearbox change carriage 92 is known. The track system 90 for the gearbox change carriage 92 requires a relatively large installation space because the track system must be designed to absorb the gravity of the gearbox change carriage 92 itself and four or more stands 1 on the gearbox change carriage 92. Therefore, the second configuration is particularly advantageous for the second drive unit 80.2 because it enables a relatively large spacing between the motor 81.2 and the stand 1 without having to use a long shaft for this purpose.

[0058] Figure 2 Schematically shows Figure 1 the stands 1 of the rolling mill 100 arranged in a Y-shape and including the drive units 80.1, 80.2, 80.3. In the case where a typical rolling mill 100 has four stands 1, two of the stands 1 are oriented in the Y-shape arrangement.

[0059] Figure 3 Schematically shows Figure 1 the stands 1 of the rolling mill 100 arranged in an inverted Y-shape and including the drive units 80.1, 80.2, 80.3. In the case where a typical rolling mill 100 has four stands 1, two of the stands 1 are oriented in the inverted Y-shape arrangement.

[0060] In a typical rolling mill 100, Figure 2 the Y-shape arrangement and Figure 3 the inverted Y-shape arrangement alternate along the rolling axis.

[0061] Figure 4 is Figure 3 a partial sectional view of the stand 1, illustrating a schematic view of the gearboxes 82.1, 82.2, 82.1 of the drive units 80.1, 80.2, 80.3. In this illustration, it can be seen that in addition to the drive shafts 84.1, 84.2, 84.3 and the output shafts 86.1, 86.2, 86.3, intermediate shafts and switching shafts are also provided in the gearbox housings 83.1, 83.2, 83.3.

[0062] The gearboxes 82.1, 82.2, 82.3 are configured such that the first two shafts starting from the motors 81.1, 81.2, 81.3 include a switching gearbox. At the third gear of the second shaft, a two-stage reduction stage starting with a plane offset is provided in order to achieve the required torque. In the embodiment shown here, the third shaft effects a Z-shaped offset and also causes a greater extension of the gearboxes 82.1, 82.2, 82.3 transversely to the orientation of the shaft. This makes it possible to create a greater gap between the motors 81.1, 81.2, 81.3 of the adjacent stands 1 and to provide a corresponding installation space.

[0063] List of reference numerals

[0064] 1 Stand

[0065] 10 Stand housing

[0066] 12 Exterior

[0067] 14.1, 14.2, 14.3, 14.4, 14.5, 14.6 Side surfaces

[0068] 20.1, 20.2, 20.3 Rolls

[0069] 21 Caliber

[0070] 22.1, 22.2, 22.3 Roll shafts

[0071] 70 Stand base

[0072] 80.1, 80.2, 80.3 Drive units

[0073] 81.1, 81.2, 81.3 Motors

[0074] 82.1, 82.2, 82.3 Gearboxes

[0075] 83.1, 83.2, 83.3 Gearbox housings

[0076] 84.1, 84.2, 84.3 Drive shafts

[0077] 86.1, 86.2, 86.3 Output shafts

[0078] 88.1, 88.2, 88.3 Connectors

[0079] 90 Track system

[0080] 92 Stand replacement carriage

[0081] 100 Rolling mill.

Claims

1. A rolling mill (100) for rolling metal bars, wires or tubes along a rolling axis, characterized in that: The rolling mill (100) comprises two or more stands (1), which are arranged one after another along the rolling axis and are each received in a stand base (70). Each of the stands (1) comprises three rollers (20.1, 20.2, 20.3), which are positioned in each case on a roller shaft (22.1, 22.2, 22.3), surround the rolling axis in a star-shaped manner and together form a caliber (21), At least two of the three roller shafts (22.1, 22.2, 22.3) of each of the stands (1) are in each case operatively connected to a drive unit (80.1, 80.2, 80.3), The drive unit (80.1, 80.2, 80.3) comprises: a motor (81.1, 81.2, 81.3) having a motor shaft; and a gearbox (82.1, 82.2, 82.3) having a Z-shaped gearbox housing (83.1, 83.2, 83.3) and having a drive shaft (84.1, 84.2, 84.3) coupled to the motor shaft and having an output shaft (86.1, 86.2, 86.3) offset parallel to the drive shaft (84.1, 84.2, 84.3) and coupled to the roller shaft (22.1, 22.2, 22.3), and the drive unit (80.1, 80.2, 80.3) of at least one of the roller shafts (22.1, 22.2, 22.3) of the stand (1) is in each case configured in a first configuration, wherein in the first configuration, a portion of the drive shaft (84.1, 84.2, 84.3) protruding outwards from the gearbox housing (83.1, 83.2, 83.3) or a portion of the motor shaft and a portion of the output shaft (86.1, 86.2, 86.3) protruding outwards from the gearbox housing (83.1, 83.2, 83.3) or a portion of the roller shaft (22.1, 22.2, 22.3) are in each case arranged to axially overlap a portion of the gearbox housing (83.1, 83.2, 83.3), wherein the drive unit (80.1, 80.2, 80.3) of at least one other of the roll axes (22.1, 22.2, 22.3) of the stand (1) is in each case configured in a second configuration, and Wherein in the second configuration, a portion of the drive shaft (84.1, 84.2, 84.3) protruding outward from the gearbox housing (83.1, 83.2, 83.3) and the motor shaft as well as a portion of the output shaft (86.1, 86.2, 86.3) protruding outward from the gearbox housing (83.1, 83.2, 83.3) and the roller shaft (22.1, 22.2, 22.3) are arranged to be non-overlapping relative to the gearbox housing (83.1, 83.2, 83.3).

2. The rolling mill (100) according to claim 1, characterized in that The third of the three roller shafts (22.1, 22.2, 22.3) of each of the stands (1) is also operatively connected to a drive unit (80.1, 80.2, 80.3), The drive unit (80.1, 80.2, 80.3) comprises: a motor (81.1, 81.2, 81.3) having a motor shaft; and a gearbox (82.1, 82.2, 82.3) having a Z-shaped gearbox housing (83.1, 83.2, 83.3) and having a drive shaft (84.1, 84.2, 84.3) coupled to the motor shaft and having an output shaft (86.1, 86.2, 86.3) offset parallel to the drive shaft (84.1, 84.2, 84.3) and coupled to the roller shaft (22.1, 22.2, 22.3), wherein the drive unit (80.1, 80.2, 80.3) is configured in the first configuration or in the second configuration.

3. The rolling mill (100) according to claim 1 or claim 2, characterized in that The drive shaft (84.1, 84.2, 84.3) coupled to the motor shaft is flush with the motor shaft.

4. The rolling mill (100) according to claim 1 or 2, characterized in that The output shaft (86.1, 86.2, 86.3) coupled to the roller shaft (22.1, 22.2, 22.3) is flush with the roller shaft (22.1, 22.2, 22.3).

5. The rolling mill (100) according to claim 1 or 2, characterized in that The roll axes (22.1, 22.2, 22.3) of adjacent stands (1) are oriented parallel to each other and are arranged to be offset from each other perpendicularly to the roll axis, All of the drive units (80.1, 80.2, 80.3) which are operatively connected to the roller axes (22.1, 22.2, 22.3) oriented parallel to one another are in each case configured in the first configuration or in the second configuration.

6. The rolling mill (100) according to claim 5, characterized in that The drive units (80.1, 80.2, 80.3) of adjacent stands (1) are in each case oriented so that the output shafts (86.1, 86.2, 86.3) are alternately offset in opposite directions relative to the drive shafts (84.1, 84.2, 84.3), the drive units being operatively connected to the roll shafts (22.1, 22.2, 22.3) oriented parallel to one another.

7. The rolling mill (100) according to claim 1 or 2, characterized in that A first roller shaft of the three roller shafts (22.1, 22.2, 22.3) of each of the stands (1) is in each case oriented such that the drive unit (80.1) operatively connected to the first roller shaft is located above the stand (1), The drive unit (80.1) operatively connected to the first roller shaft of the three roller shafts (22.1, 22.2, 22.3) is configured in the first configuration.

8. The rolling mill (100) according to claim 7, characterized in that The motor (81.1) of the drive unit (80.1) operatively connected to the first roller shaft among the three roller shafts (22.1, 22.2, 22.3) is mounted on the gearbox housing (83.1) of the corresponding drive unit (80.1) by means of a bracket.

9. The rolling mill (100) according to claim 1 or 2, characterized in that The second roller shaft of the three roller shafts (22.1, 22.2, 22.3) of each of the stands (1) is in each case oriented such that the drive unit (80.2) operatively connected to the second roller shaft is located below the stand (1), The drive unit (80.2) operatively connected to the second roller shaft of the three roller shafts (22.1, 22.2, 22.3) is configured in the second configuration.

10. The rolling mill (100) according to claim 1 or 2, characterized in that The third of the three roller axes (22.1, 22.2, 22.3) of each of the stands (1) is in each case oriented horizontally so that the drive unit (80.3) operatively connected to the third roller axis is located next to the stand (1), wherein the drive unit (80.3) operatively connected to the third roller shaft of the three roller shafts (22.1, 22.2, 22.3) is configured in the second configuration, Or wherein the drive unit (80.3) operatively connected to the third roller shaft of the three roller shafts (22.1, 22.2, 22.3) is configured in the first configuration.

11. The rolling mill (100) according to claim 1 or 2, characterized in that In addition to the drive shaft (84.1, 84.2, 84.3) and the output shaft (86.1, 86.2, 86.3), the gearbox housing (83.1, 83.2, 83.3) also includes at least one intermediate shaft.

12. The rolling mill (100) according to claim 11, characterized in that In addition to the drive shaft (84.1, 84.2, 84.3) and the output shaft (86.1, 86.2, 86.3), the gearbox (82.1, 82.2, 82.3) also includes the intermediate shaft and the switching shaft.

13. The rolling mill (100) according to claim 1 or 2, characterized in that The stand (1) has a hexagonal outer shape as viewed along the rolling axis.

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