JPS5849329B2 - Roll changing device for rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll changing device for rolling mill rolls, and more particularly to a roll changing device for a multi-high rolling mill in which intermediate rolls, work rolls, etc. are arranged between upper and lower back rolls.

The rolls of a rolling mill need to be replaced periodically or as needed due to damage, wear, etc., and various roll replacement methods are used for this purpose. Reducing the time required for rearrangement is extremely important in improving the operating rate of the rolling mill.

The conventional method used to shorten the roll changeover time is to place a new roll on the drive side of the rolling mill, and use this new roll to push out the old roll in the mill that needs to be replaced. Alternatively, there is a method in which a new roll placed on the operation side of the rolling mill is pulled in by an old roll in the rolling mill to perform roll replacement.

In each of these systems, a cart for storing new rolls or old rolls is always on standby on the operation side of the rolling mill, and when the rolls are changed, it is advanced near the rolling mill 1 to transfer the old and new rolls.

In this case, the carriage is moved by a back roll changing cylinder placed below the floor on the operation side of the rolling mill, but this conventional system has the following drawbacks.

In the rolling mill roll changing device shown in Fig. 1, roll changing of a rolling mill equipped with a work roll 1, an intermediate roll 2, and a back roll 3 is performed using a new roll placed on the drive side of the rolling mill. This is done by pushing the old roll out to the operation side.

In order to complete this roll change in a short time, the operation side of the rolling mill is driven by a movable cart 4 for storing the work rolls 1 and intermediate rolls 2 that run on rails 8, and a back roll 30 and a change cylinder 5. The movable carriage 4 and the fork end 6 are detachably connected to each other by a connecting pin 7.

Now, when replacing the work rolls 1, etc., the movable cart 4 is connected to the hawk end 6 with the pin 7, and then moved to the rolling mill by the recombination cylinder 5, and the new roll 10 placed on the drive side is replaced. The old rolls 1 and 2 are pushed into the rolling mill by a suitable device (not shown), and are then pushed out and housed on the movable carriage 4 (see FIG. 2).

Thereafter, the movable carriage 4 is returned to the state shown in FIG. 1 by the recombination cylinder 5, and the recombination is completed.

However, in this system, various problems occur regarding the floor plate 9 provided as a passage for the operator on the operation side of the rolling mill, as shown in FIG.

1. First of all, a long hole is cut out in the movable cart 4 so that the connecting pin 7 with the fork end 6 can move in the roll axis direction when driven by the cylinder 5, but this pin has a fairly large diameter for strength reasons. The cut-off bow poses a non-negligible risk to the operator's walking safety.

For this reason, a cover is usually provided over the notch hole and removed each time the reassembly is performed, but this complicates the work and increases the working time.

When moving the hawk end 6 for rearranging the back crawl, the floor plate 9 must be removed, but in this case as well, a similar increase in working time is unavoidable.

A possible solution to this drawback would be to make the floor plate 9 movable, but since the floor plate 9 has a fairly long cutout hole as described above, from the viewpoint of its strength, it is possible to make the floor plate 9 movable. It is difficult to obtain a floor plate with a movable structure that can withstand the above, and all conventional floor plates have been constructed as fixed floors.

SUMMARY OF THE INVENTION In view of the drawbacks of the prior art, an object of the present invention is to provide a roll changing device that can move a floor plate provided on the operation side of a rolling mill.

A feature of the present invention is that the lower back roll is connected to the operating side of a rolling mill that is equipped with a pair of upper and lower back rolls and a roll assembly consisting of at least a pair of upper and lower work rolls arranged between these back rolls. a moving device for recombining the roll assembly; a movable cart located above the moving device and traveling in connection with the moving device for recombining the roll assembly; In a roll changing device for a rolling mill, which is provided with a cylinder that is driven by pushing and pulling in the roll axis direction, the movable cart is moved to a side opposite to the rolling mill side, and the moving device is also moved to a side opposite to the rolling mill side. A movable floor surface is installed, which is detachably connected to the extension part of the movable platform and is movable along the running surface of the movable trolley, and is detachably coupled to the moving device, and the movable floor surface is connected to the movable floor surface. It is located in a place where you can drive on top of it.

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, a rolling mill in which the roll changing device of the present invention is used includes a pair of upper and lower back rolls 3, 3 and a pair of upper and lower rolls supported by these back rolls 3, 3. It is equipped with intermediate rolls 2, 2 and work rolls 1, 1.

On the operation side of this rolling mill, a lower truck 12 as a moving device for rearranging the lower back roll 3 running on the rail 11,
Cylinder 5 and intermediate roll 2 that push and pull this lower truck 12 with respect to the rolling mill from the side opposite to the rolling mill side.
, 2 and the work rolls 1, 1, a movable trolley 4 that runs on rails 8 is provided.

An extension 13 extending in the cylinder direction is formed at the cylinder side end of the lower truck 12, and the movable truck 4 is removably connected to this extension 13 at its rear end by a connecting pin 7.

Reference numeral 14 denotes a movable floor plate which is arranged on the running body of the movable trolley 4 and is configured to be movable, and reference numerals 1, 16 and 17 are metal chocks of the lower work roll 3 and hooks provided at the rolling mill side end of the lower trolley 12, respectively. It is.

A case where the rolls of a rolling mill are rearranged using such a roll rearrangement device will be explained.

When recombining the intermediate rolls 2, 2 and the work rolls 1, 1, the movable carriage 4 and the extension portion 13 of the lower carriage 12 are used.
are connected by a connecting pin 7, and by operating the cylinder 5, the lower truck 12 is pushed out along the rail 11 toward the rolling mill, and the movable truck 4 is accordingly moved along the rail 8 onto the movable floor plate 14. Guide to the roll storage position.

Here, the old roll extrusion device installed on the drive side of the rolling mill (
The rolls 1, 1 and 2, 2 are pushed out onto the movable carriage 4 by a roller (not shown), and the movable floor plate 14 is connected to the rolling mill side end of the lower carriage 12 by a floor plate connecting pin 15 (see Fig. 4).
Thereafter, the cylinder 5 is operated to move the movable truck 4, movable floor plate 14, and lower truck 12 back together to the position shown in FIG.

When rearranging the heart crawl, connect pins 7 and 15.
is pulled out to release the lower truck 12 from the connection, drive the cylinder 5 to make the lower truck 12 travel on the rail 11, and at the rearrangement position connect the hook 16 of the metal chock of the lower back roll 3 and the hook 17 of the lower truck. engage each other (see Figure 6).

Next, the cylinder 5 is driven once in the opposite direction to pull out the lower back roll 3 from the rolling mill, and the stool 19 is placed above it (see FIG. 7).

Here, the stool 19 is placed on the chock of the lower back roll 3 and moved towards the rolling mill again, and then the chock of the upper back roll 3 is placed on top of the chock (see FIG. 8).

6 to 8 show the movable cart 4 and the movable floor plate 14.
are omitted).

Thereafter, these are pulled out to the outside of the operation side, and after exchanging the old and new back rolls, the new back rolls are assembled into the rolling mill using a recombination cylinder.

The new intermediate roll and new work roll are installed into the rolling mill from the drive side.

The first movable floor plate is also moved to its original position by the cylinder, completing the reassembly work.

As described above, in the embodiment of the present invention, the end portion of the lower cart 12 for changing the lower back roll 3 in the roll changing device of the rolling mill extends to the side opposite to the rolling mill side. 13, the end of the movable trolley 4 for changing the roll assembly including the work roll 1 and the intermediate roll 2 on the side opposite to the rolling mill side is connected by the connecting pin 7. There is no need to cut out pin holes in the floor plate provided on the running surface of the operating side of the movable trolley 4.

Therefore, danger to the operator while walking due to the cutout hole is prevented, and there is no need to provide a hole cover that complicates operations in order to avoid such danger.

Furthermore, since there is no notch, the strength of the floor plate is increased, and since this can be configured as a movable floor plate 9, the labor of removing it each time the lower truck 12 is moved is saved.

Similarly, the above embodiment has been described as being used in a six-high rolling mill equipped with a pair of upper and lower back rolls, an intermediate roll, and a work roll, but the present invention is applicable to a six-high rolling mill equipped with a pair of upper and lower back roll buttons and a work roll. It can be widely applied to rolling mills in which a roll assembly is arranged between back rolls, such as a four-high rolling mill.

As described above, according to the present invention, the moving device for rearranging the back rolls and the movable trolley for rearranging the roll assemblies disposed between these back rolls are oriented toward the side opposite to the respective rolling mills. Due to the detachable connection, the floor plate provided on the rolling mill operation side of the movable cart can be made movable, thereby making it possible to make the roll change work safer and faster.

[Brief explanation of the drawing]

1 and 2 are diagrams schematically showing a conventional recombining device, and FIGS. 3 to 8 are diagrams schematically showing the recombining device of the present invention at each work step. 1... Work roll, 2... Intermediate roll, 3...
Back crawl, 4... Movable trolley, 5... Cylinder,
6... Hawk end, 7... Connecting pin, 9... Floor plate, 12... Lower truck, 13... Extension part, 14...
Movable floorboards.

Claims (1)

[Claims] 1. To the operation side of a rolling mill equipped with a pair of upper and lower bank rolls L and a roll assembly consisting of at least a pair of upper and lower work rolls arranged between these bank rolls,
a moving device for rearranging the lower back roll; and a movable trolley for rearranging the roll assembly, which is located above the moving device, is located above the moving device, and runs while connected to the moving device. and a cylinder for pushing and pulling the moving device in the direction of the roll axis with respect to the rolling mill, the movable cart is moved to a side opposite to the rolling mill side. Similarly, it was removably connected to an extension of the moving device on the side opposite to the rolling mill side, and was further movable along the running surface of the movable cart, and was removably connected to the moving device. 1. A roll changing device for a rolling mill, characterized in that a movable floor surface is installed so that the movable cart can run on the movable floor surface.