JPH0638576Y2 - Roller leveler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a roller leveler used for correcting distortion of a steel sheet such as a hot rolled steel sheet or a hot rolled steel sheet.

[Prior Art] Conventionally, as a roller leveler for straightening a hot steel plate or a hot rolled steel plate, as shown in FIG. 5, a plurality of pass lines L for passing a steel plate 3 as a material to be straightened are sandwiched therebetween. The upper work rolls 1 and the lower work rolls 2 are alternately arranged in a zigzag pattern in the vertical direction, so that the upper work rolls 4 are located substantially directly above each upper work roll 1 and substantially below each lower work roll 2.
And the lower retaining rolls 5 are arranged and supported (Japanese Patent Laid-Open No. 56-84124), or, as shown in FIG. There is one in which the auxiliary rolls 5 are arranged in a zigzag manner so that the upper work roll 1 and the lower work roll 2 are supported respectively (Shokai Sho 57-165309).

[Problems to be solved by the invention] However, in the former case, the lower work roll 2 is supported by the lower retainer roll 5 from almost directly below, and the lower work roll 2 and the lower retainer roll 5 have a shape of "8". Even if a large amount of scale 6 peeled off from the steel plate 3 falls during the straightening work, the scale 6 is brought into contact with
Can be dropped downward without accumulating on the lower holding roll 5, but when the leveling force acts, the lower work roll 2 is bent in the horizontal direction by the feeding force of the steel plate 3 which is the material to be straightened, and the bending force. As a result of bending in the vertical direction by the above, it bends so as to slide down from the lower retaining roll 5, so that there is a problem that a large leveling force cannot be applied. On the other hand, in the latter case, since the lower retaining rolls 5 are arranged in a zigzag pattern with respect to the lower work roll 2, a large leveling force can be given without the above-mentioned problem of bending, but The scale 6 separated from the steel plate 3 accumulates in the scale bank 7 formed by the abutting portion of the lower retainer roll 5 and
If the scale 6 is caught between the lower work roll 2 and the lower reserve roll 5, there is a problem that the lower work roll 2 and the lower reserve roll 5 are damaged. Therefore, it is necessary to frequently perform roll replacement, which causes a problem of lowering the operating rate of the line.

Therefore, the present invention is intended to enable a roller leveler in which lower work rolls and lower retaining rolls are arranged in a zigzag manner to eliminate the adverse effect of scale peeling from a steel plate.

[Means for Solving the Problems] In order to solve the above problems, the present invention arranges upper work rolls and lower work rolls in a zigzag pattern above and below a pass line, and backs up the lower work rolls. In a roller leveler in which the lower work rolls are arranged in a staggered pattern with respect to the lower work rolls, the lower work rolls and the lower work rolls are opened so as to open the scale bank formed at the contact portion between the lower work rolls and the lower work rolls. A detector for detecting whether or not there is a steel plate between the upper and lower work rolls, and a command for sending an operation command to the above-mentioned lifting device based on a detection signal of the detector. A device is provided.

[Operation] When the lower working roll and the lower retaining roll are separated from each other by the elevating device, the scale bank is opened and the scale in the scale bank is dropped and removed.

The detector detects that there is no steel plate between the upper work roll and the lower work roll, and the command device activates the lifting device based on the signal, so that the automatic operation between the lower work roll and the lower work roll is performed. It becomes possible to remove the scale by separating the scale.

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

1 to 3 show an embodiment of the present invention, and like the conventional roller leveler shown in FIG. 6, a plurality of upper work rolls 1 sandwiching a pass line L through which a steel plate 3 is passed.
And the lower work rolls 2 are arranged in a zigzag pattern along the pass line direction, and the upper work rolls 4 are arranged in contrast to the upper work rolls 1 described above.
And the lower retaining rolls 5 are arranged in a zigzag pattern with respect to the lower work rolls 2 to support the upper and lower work rolls 1 and 2, respectively.
As shown in the figure, an upper frame 9 arranged in the upper part of the housing 8 so as to be able to move up and down by the operation of the pressure reducing device 17 supports one upper end of each of the plurality of upper work rolls 1 so as to rotatably support both ends of each shaft. The work roll shaft box 10 is fixed via the bracket 11, and the upper work roll shaft box 12 which rotatably supports both shaft ends of the plurality of upper work rolls 4 is fixed to the upper frame 9 for the upper work. In a configuration in which the roll 1 and the upper retaining roll 4 are suspended and supported by the upper frame 9, the present invention is configured to vertically separate the lower work roll 2 and the lower retaining roll 5. More specifically, a pedestal 14 for supporting an intermediate portion of a lower work roll shaft box 15 that supports both ends of each shaft of the plurality of lower work rolls 2 is provided on a lower frame 13 arranged at a lower position in the housing 8. In addition to being installed, the lower work roll shaft box 15 is placed on the pedestal 14 and the shaft ends of the lower work roll 5 are rotatably supported on the lower frame 13 so as to be rotatable.
16 is installed, and the lower work roll shaft box 15 is attached to the lower frame 13 at a position corresponding to both ends of the lower work roll shaft box 15.
As an elevating device for elevating and lowering and lowering and lowering the lower work roll 2 and the lower retaining roll 5, for example, a hydraulic cylinder 21 is installed vertically, and a rod of the hydraulic cylinder 21 is installed.
The tip of the rod 22 is brought into contact with the lower surface of the lower work roll shaft box 15, and the rod is operated by the extension operation of the hydraulic cylinder 21.
The tip of 22 comes into contact with the lower surface of the lower work roll shaft box 15, and the lower work roll shaft box 15 is pushed up to move the lower work roll 2
Is separated from the lower retaining roll 5 so that the scale bank 7 formed by the contact portion between the lower work roll 2 and the lower retaining roll 5 can be opened. Further, between the lower work roll shaft box 15 and the pedestal 14, as a pulling mechanism for always pulling the lower work roll shaft box 4 toward the lower frame 13 side, the upper plate portion of the pedestal 14 is penetrated. And the upper end of a rod 19 arranged so as to be movable in the vertical direction is fixed to the lower surface of the lower work roll shaft box 15, and
The compression spring 18 is interposed between the stopper 20 fixed to the lower end of the frame and the upper plate portion of the pedestal 14, and the elastic force of the spring 18 pulls the rod 19 downward from the pedestal 14. The lower work roll 2 is always pulled toward the lower frame 13 side through the work roll shaft box 15 so that the lower work roll 2 is positioned, and the presence or absence of the steel plate 3 is detected at the steel plate inlet and outlet of the housing 8. Detector 23
When the a and 23b are installed and the absence of the steel plate 3 is detected by the detectors 23a and 23b, the hydraulic cylinder 21
A command device 24 that outputs an extension operation command is provided.

In the state shown in FIG. 1 in which the steel plate 3 is passed between the upper work roll 1 and the lower work roll 2 to correct the steel plate 3, the lower work is performed by the pressing force of the spring 18 acting on the rod 19. Since the roll shaft box 15 is pulled toward the lower frame 13 and positioned, the lower work roll 2
Is supported by abutting against the lower retaining roll 5, and the straightening work can be performed as usual.

When the straightening work is completed and the straightened steel plate 3 is delivered from the inside of the housing 8 and the next steel plate to be straightened does not come to the inlet side, detection is made at the inlet and outlet of the housing 8. Since the plates 23a and 23b detect that the steel plate 3 is gone, the command device 24 sends a signal to the command device 24 to send an extension operation command to the hydraulic cylinder 21. When the hydraulic cylinder 21 is extended, the rod 22 of the hydraulic cylinder 21 is raised and abuts on the lower surface of the lower work roll shaft box 15, and then is further raised so that the lower work roll shaft box 15 is moved. Above spring 18
Therefore, the lower work roll 2 is raised and separated from the lower retaining roll 5. As a result, a gap S is formed between the lower work roll 2 and the lower reserve roll 5 as shown in FIG. 4, so that the scale bank 7 at the contact portion between the lower work roll 2 and the lower reserve roll 5 is opened. become. Therefore, the scale 6 that was peeled off from the steel plate 3 and accumulated in the scale bank 7 during the above-mentioned straightening work is dropped from the lower retaining roll 5 and removed. At this time, if the scale on the lower retaining roll 5 is removed by using cooling water or air, the scale can be removed more effectively. Although the gap S is the thickness of the steel plate 3 in the above description, it can be adjusted arbitrarily.

Next, when the succeeding steel plate 3 is fed into the housing 8, the detector 23a installed on the line upstream side of the housing 8 detects the entrance of the steel plate 3, and the signal from the detector 23a causes the command device 24 to send the hydraulic cylinder 21 to the hydraulic cylinder 21. A contraction operation command is sent to the hydraulic cylinder 21, and the hydraulic cylinder 21 is contracted. As a result, the rod 22 is lowered, so that the lower work roll shaft box 15 is pulled toward the lower frame 13 side by the force of the spring 18 and positioned, and as a result, the lower work roll 2 is again brought into contact with and supported by the lower retaining roll 5. The lower backing roll 5 is returned to a state in which it can receive the reaction force at the time of straightening.

As described above, in the present invention, the steel plate 3 has the housing 8
Since the scale bank 7 can be opened by raising the lower work roll 2 and separating it from the lower retaining roll 5 when it is not inside, the scale 6 can be easily removed. It is possible to reduce damage to the lower work roll 2 and the lower retaining roll 5 due to the above.

Although the hydraulic cylinder 21 is used as the lifting device for opening the scale bank 7 in the above embodiment, a worm jack or a link mechanism may be used instead of the hydraulic cylinder 21. Also, the case where the lower work roll 2 is raised to open the scale bank 7 is shown.
It is also possible to lower the lower backing roll 5 by supporting the lower backing roll 5 up and down, and as a means for improving the above-described scale removing effect, an air pipe is installed below the lower backing roll 5. Air may be jetted toward the lower retaining roll 5, or in a cooling water type roller leveler, a cleaning pipe may be arranged below the lower retaining roll 5 to inject cooling water from the cleaning pipe to the lower retaining roll 5. Alternatively, in the embodiment, the steel plate 3
The presence or absence of a detector 23 installed at the inlet and outlet of the housing 8
The case where the opening operation of the scale bank 7 is performed by detecting with a and 23b is shown, but for example, a load detector is provided in the rolling-down device 17 part to perform the operation based on the signal of the load detector. Of course, various modifications may be made without departing from the scope of the present invention.

[Advantage of Invention] As described above, according to the roller leveler of the present invention,
Since the scale bank can be opened by separating the lower work roll from the lower work roll by the lifting device, the scale accumulated in the scale bank can be easily removed, and the lower work roll by the scale can be easily removed. It is possible to reduce the damage of rolls and lower rolls, to extend the life of rolls and to reduce the frequency of roll replacement, which in turn can improve the operating rate of the line. Since it is possible to perform the contact and separation operation of the roll and the lower backing roll by the command of the command device based on the signal of the detector, it is possible to automatically and efficiently perform the scale removal work, which is excellent. Be effective.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the roller leveler of the present invention, FIG. 2 is an enlarged view of II-II in FIG. 1, and FIG. 3 is a perspective view showing an example of a lower work roll lifting device. FIG. 4 is an operation explanatory view showing a state in which the scale bank is opened, and FIGS. 5 and 6 are schematic views showing examples of conventional roller levelers. 1 ... Top work roll, 2 ... Bottom work roll, 3 ... Steel plate, 5 ...
Lower copy roll, 6 ... Scale, 7 ... Scale bank, 21
… Hydraulic cylinders (lifting devices), 23a, 23b… Detectors, 24…
Commanding device, L ... pass line.

Claims (1)

[Scope of utility model registration request] 1. An upper work roll and a lower work roll are arranged in a zigzag pattern on both sides of a pass line in a zigzag manner, and a lower retaining roll for backing up the lower work roll is arranged in a zigzag pattern with respect to the lower work roll. In a certain roller leveler, a lifting device for approaching and separating the lower work roll and the lower reserve roll so as to open the scale bank formed at the contact portion of the lower work roll and the lower reserve roll, and further, A roller leveler comprising a detector for detecting the presence or absence of a steel plate between the upper work roll and the lower work roll, and a command device for sending an operation command to the lifting device based on a detection signal of the detector.