The invention concerns a method and a device for handling/transporting work rolls and/or back-up rolls in a roll workshop.
WO 03/099 479 A1 describes a device for changing pairs of work rolls and/or pairs of back-up rolls in rolling stands, in which the back-up rolls and the work rolls are guided in the housing frame in respective chocks that can be lifted or lowered, and the pair of work rolls can be moved out by a linear actuator while being supported on the chocks. The pair of back-up rolls can be moved in or out by means of a lower back-up roll supported on a track and wheels and a roll-changing frame, which supports the upper back-up roll and is supported on the lower back-up roll. In this regard, the pair of work rolls can be coupled on the drive side of the rolling stand with a hydraulic piston-cylinder actuator that is dimensioned in its stroke length for the removal or installation distance and can be uncoupled when it has been withdrawn the required distance. Furthermore, a roll-changing frame, which has been moved in at a height level between the back-up rolls, can be coupled to the same piston-cylinder actuator, and, when the upper back-up roll and the roll-changing frame are supported on the lower back-up roll, the pair of back-up rolls can be moved out or moved back in. The cited document also describes a corresponding method.
WO 2004/039 512 A1 discloses a tractor, with which the sets of rolls are pulled into a roll workshop (RW) and moved back again. The tractor is moved by gear wheels of the tractor that engage racks.
DE 43 21 663 A1 describes a rolling mill with support plates, which are arranged on the operating side of the rolling stands, are supported on carriages, can be displaced transversely to the roll axes, and are equipped with at least two pairs of rails, which are arranged side by side for receiving sets of work rolls supported on rollers, and with changing pits arranged in front of each rolling stand, with the bottom of each changing pit being equipped with runout rails for sets of back-up rolls. In this regard, the pits are covered between the stands and the support plates with cover plates that extend the length of the pit, which can be fixed in their initial position and can be swiveled out of this initial position to change the back-up rolls, and each cover plate is provided with a . . . for moving out sets of work rolls and transferring them to one of the pairs of tracks of the respective support plates assigned to it.
WO 03/015 949 A1 describes an apparatus for changing the work rolls and back-up rolls of a strip rolling mill, in which a roll-changing carriage, which can be displaced transversely to the rolling stand and holds the old sets of rolls that have been removed, makes it possible to replace the old: sets of rolls with new sets of rolls. The apparatus consists of a stationary changing cylinder mounted at the floor level of the mill, whose piston rod can move in and out transversely to the rolling stand, and of an extraction carriage connected to the forward end of said piston rod and movable on said roll-changing carriage, said extraction carriage being connectable with said roll-changing carriage such that said extraction carriage and said roll-changing carriage are movable together by said changing cylinder transversely to the longitudinal path of said strip mill. In addition, a side shift cylinder that is independent of the roll-changing carriage can move a side shift table, which is installed in said roll-changing carriage, transversely to the direction of movement of the roll-changing carriage, in order to move the sets of rolls to be changed in or out of a changing position which is aligned with the center of the rolling stand.
WO 2005/089 972 A1 describes a method for changing sets of rolls in rolling stands of a mill train with several rolling stands, each of which has back-up rolls and work rolls, by supporting them on each other and then moving them out in the axial direction of a set of work rolls or a set of back-up rolls on the operating side into a roll workshop and then: moving new sets of rolls back and mounting them. During this operation, the sets of worn work rolls transported by a number of separate side shift carriages that corresponds to the number of rolling stands on the operating side are successively moved by a single locomotive on a single connecting track to the roll workshop, and from there the new sets of work rolls are driven back and at changing intervals are set down on the respective side shift carriages between the rolling stands, and after clearance of the operating side by the side shift carriages, after each worn set of work rolls is dismounted, the worn back-up rolls are moved out, moved to the roll workshop by crane, serviced, transported back, and remounted in the assigned rolling stands. The cited document also describes a device for carrying out this method.
The objective of the invention is to propose a flexible method for handling/transporting the work rolls and/or back-up rolls in the roll workshop with little expense with respect to the equipment. A further objective of the invention is the development of a device for carrying out the method of the invention.
In accordance with the invention, this objective is achieved by a method according to the introductory clause of claim 1, which is characterized by the fact that
the work rolls are pulled/moved over platforms with a locomotive from the rolling stand in the mill hall to the roll workshop,
the locomotive moves in a roll-changing pit,
a support structure with a left part and a right part is constructed in the roll workshop on the right and left side of the roll-changing pit,
a changing carriage moves on the support structure,
devices for holding the work rolls/sets of work rolls are present on the changing carriage;
and/or that
the back-up rolls are pulled/moved with the locomotive from the rolling stand to the roll workshop;
the back-up rolls are taken from the roll-changing pit;
a new set of back-up rolls is placed in the roll-changing pit, and
the new set of back-up rolls is moved into the stand by the locomotive.
The advantage of this method is that the work rolls or sets of work rolls and/or the back-up rolls or sets of back-up rolls have to be handled only in the roll workshop. Only the mounting and dismounting of the work rolls or sets of work rolls and/or back-up rolls or sets of back-up rolls take place in the mill hall. The other measures are carried out completely in the roll workshop. The support structure with changing carriages that is provided for this purpose makes it possible to use a smaller crane here as well.
Further embodiments of the method are described in the dependent method claims.
The invention also concerns a device for carrying out the method of the invention. In a device for handling/transporting work rolls and/or back-up rolls in a roll workshop, a support structure is constructed in the roll workshop and is arranged on both sides of a roll-changing pit.
The advantage of this device is that the work rolls or sets of work rolls and/or the back-up rolls or sets of back-up rolls are moved/transported directly from the mill hall to the roll workshop without having to be lifted and conveyed in the mill hall by a crane or having to be moved by a separate transport carriage from the mill hall to the roll workshop. It is possible to get by with and to design a smaller crane in the mill hall.
Further embodiments of the device are described in the dependent device claims.
The invention concerns the complete roll change for sets of work rolls and sets of back-up rolls with side shifting in the mill hall.
The total transport of the sets of rolls is carried out with only one hydraulic roll-changing locomotive. All of the sets of rolls are transported from the rolling stand to the roll workshop and back to the rolling stand.
Work Roll Change with Side Shifting
The apparatus for changing the work rolls is located on the operating side of the rolling mill.
The tasks of the work roll-changing apparatus consist in pulling used sets of work rolls out of the rolling stand and then, for example, transporting them as far as the roll workshop and in transporting the freshly ground sets of work rolls from the roll workshop back to the rolling stand.
The platforms arranged on both sides, on which the sets of work rolls are transported, are welded steel structures and serve as a track foundation during the roll change. The sets of work rolls are moved on these platforms to get from the rolling stand to the roll workshop or back to the rolling stand. Slide bars/slide rails are bolted onto these platforms and serve as slideways for the drawbar with the set of work rolls coupled to it. At the same time, the platforms cover the area of the roll-changing pit. They are hinged and are supported by a pivot. They are supported laterally on the foundation in order to receive a load.
Platforms of this type make it possible to carry out a work roll change with a hydraulic roll-changing locomotive, which is located in the lower region of the roll-changing pit.
The used sets of work rolls are now transported by the roll-changing locomotive from the rolling stand to the roll workshop, or the new sets of work rolls are transported to the rolling stand.
The work roll-changing locomotive that is presently used for this purpose is no longer needed.
Savings Compared to Conventional Work Roll Changing:
The complete work roll locomotive with all of its equipment, such as
4 electric motors, a=50 kW
4 gear ratios
4 pinions
2 cable drums with cable
the complete electronics/electric cylinder
mechanical treatment by E-suppliers
installation, etc.
Advantages for the Customer:
less maintenance,
hall crane in the mill hall no longer needs to be designed for the weights of the back-up rolls.
A transport carriage for transporting the sets of rolls from the mill hall to the roll workshop or back to the mill hall is no longer needed.
A weight reduction of the platforms of about 50% is realized. Furthermore, 30-t racks with mounting material and feather keys are no longer needed. The complicated work on the platforms for mounting the racks is eliminated.
In the preparations for changing the back-up rolls, the hall crane is needed only for opening or closing the platforms. Due to their low height (width), the opened platforms do not interfere with the operation of the hall crane.
Removal of the platforms by the hall crane is not necessary. In addition, no space needs to be provided for setting down the platforms in the halls. This means time savings as well.
Back-Up Roll Change
The apparatus for changing the back-up rolls is located in the lower region of the roll-changing pit.
The tasks of the back-up roll-changing apparatus are transporting used sets of back-up rolls out of the rolling stand to the roll workshop and transporting the new sets of back-up rolls from the roll workshop back to the rolling stand.
The platforms arranged on both sides, on which the work rolls are transported, also serve as a track foundation for the roll-changing frame for the back-up rolls. The roll-changing frame for changing the back-up rolls is moved into the rolling stand on these platforms by means of the locomotive. The work roll-changing locomotive that is presently used for this purpose is no longer needed.
Savings in Connection with Changing the Back-Up Rolls
The entire work roll locomotive with all of its equipment is no longer needed.
Other Savings:
Smaller hall crane in the mill hall.
The operation that consists of the mill crane lifting the sets of rolls and then setting them down on the transport carriage to transport them to the roll workshop is eliminated.
The transport carriage with its drive mechanism for moving the rolls between the mill hall and the roll workshop is no longer needed.
Roll-Changing Locomotive for Changing the Work Rolls and Back-Up Rolls.
The sets of work rolls and back-up rolls are transported with the roll-changing locomotive from the rolling stand to the roll workshop and/or the new sets of rolls are transported to the rolling stand. The roll-changing locomotive is located in the lower region of the roll-changing pit and consists essentially of the housing (carriage body):
4 hydraulic motors with transmission and pinion shaft
2 hydraulic cylinders
1 bayonet catch for the work roll change
1 bayonet catch for the back-up roll change
Hydraulic Roll-Changing Locomotive
The back-up roll change, the work roll change, and the movement of the back-up roll-changing frame into the rolling stand are accomplished by the hydraulic roll-changing locomotive.
The work roll-changing locomotive that is presently used for this purpose is no longer needed. Even if side shifting is being used in the mill hall or the roll workshop, this locomotive transports the sets of back-up rolls and work rolls to the roll workshop or back to the rolling stand.
Savings:
Smaller hall crane The operation that consists of the mill crane lifting the sets of rolls and then setting them down on the transport carriage to transport them to the roll workshop is eliminated.
The transport carriage with its drive mechanism for moving the rolls between the mill hall and the roll workshop is no longer needed.
A specific embodiment of the invention is explained in greater detail below with reference to the highly schematic drawings.
The support structure 26 is shown in greater detail in
As
As
As shown in
Number | Date | Country | Kind |
---|---|---|---|
10 2006 001 316.6 | Jan 2006 | DE | national |
10 2006 030 934.0 | Jul 2006 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP07/00118 | 1/9/2006 | WO | 00 | 9/2/2008 |