JPH0418921B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a roll changing device for a rolling mill.

First, an outline of a conventional pair cross roll type rolling mill will be explained with reference to FIGS. 1 to 3.
FIG. 1 is a schematic front view of a pair-cross roll type rolling mill, FIG. 2 is a schematic partial side view of its back-up roll changing device, and FIG. 3 is a view taken along the - arrow in FIG.

As shown in FIGS. 1 to 3, this rolling mill has a pair of upper and lower work rolls 2a that pinch the rolled material 1,
2b and back-up rolls 3a, 3b circumscribing the work rolls 2a, 2b, each roll 2
a, 2b, 3a, 3b are pivotally supported at both ends by a pair of roll jocks 4a, 4b, 5a, 5b, respectively, and work roll jocks 4a, 4b.
are backup roll ticks 5a and 5b, respectively.
The back up roll yoke 5a, 5b is mounted in the housing 6 so as to be vertically movable.

In addition, backup rolls 5a and 5b
Jacques 8 for roll cross are attached to a pair of upper and lower cross beams 7a and 7b attached to the front and rear side walls in the rolling direction Z.
a, 8b are mounted, and the back up roll jocks 5a, 5b are tilted by the drive of the jacks 8a, 8b, and the rolls 2a, 3a and 2b, 3b are moved to the required cross position with respect to the line perpendicular to the rolling direction Z. It is possible to intersect at an angle θ. Further, roll bending hydraulic cylinders 9a, 9b for controlling the shape of the rolled material 1 are interposed between the work roll jocks 4a, 4b and the back-up roll jocks 5a, 5b, respectively.

On the other hand, the upper end of the upper back up roll yoke 5a slidably abuts on the upper equalizer beam 10a which is movable up and down within the housing 6.
A lowering force is applied to the upper backup roll yoke 5a by a pair of screw type lowering devices 11 connected to the upper equalizer beam 10a. Further, the lower back up roll yoke 5b is placed on a sled 13 for changing rolls via a rocker plate 12, and the sled 13 is slidable on the lower equalizer beam 10b which can move up and down within the housing 6. The lower equalizer beam 1
A pair of screw-type lifting devices 14 connected to the lower back-up roll yoke 5b apply a lifting force to the lower back-up roll yoke 5b. In addition, Jyatsuki 8b
During the roll cross operation, the lower back up roll chock 5b, rocker plate 12, and thread 13 are integrated into the lower equalizer beam
Slide and rotate on 0b.

Furthermore, as shown in FIGS. 2 and 3, a hook-shaped latch 15 is attached to the working end of the thread 13.
On the other hand, a traverse cylinder 17 is fixed on the base 16 in front of the latch 15a, and a similar hook-shaped latch is attached to the tip of the piston shaft 17a, which can be detachably engaged with the latch 15a of the thread 13. 15b are attached and the latches 15 are engaged with each other during roll change.
The sled 13 is moved in the direction of arrow Y on the lower equalizer beam 10b and the sled base 18 by the traverse sill 17 via the sled 15a and 15b, and the upper and lower back up roll assemblies placed on the sled 13 are moved in the axial direction. It is designed to be integrally moved in and out of the housing 6 along.

Here, in the above-mentioned rolling mill, when the upper and lower rolls do not cross each other (when the cross angle θ is zero), it is usually possible to perform the rolling operation with both latches 15a and 15b engaged. However, as shown by the chain line in FIG. 3, when the cross angle θ is not zero, that is, when the latch 15a of the thread 13 is tilted, or when the latch 15a is moved up and down by the lifting device 14 to adjust the pass line up and down, etc. In order to avoid interference between the latches 15a and 15b, it is necessary to disengage the latches 15a and 15b and move the piston shaft 17a of the traverse cylinder 17 backward. Therefore, conventionally, both latches 15a and 15b have to be attached and detached each time the rolls are changed.

Below, the latches 15a, 1 at the time of conventional roll rearranging
An outline of the procedure for attaching and detaching 5b will be explained with reference to FIG. First, the thread 13 is moved between both latches 15 by the lifting device 14 through the lower equalizer beam 10b.
a and 15b are raised to a position where they do not interfere with each other (FIG. 4a), and then the traverse cylinder 17 is operated to move the latch 15b to the forward position X (FIG. 4b). Next, the traverse cylinder 17
of the piston shaft 17a with a small stroke ΔS (for example,
Adjust the latch 15b to a position where it can engage with the latch 15a of the thread 13 by moving the latch 15b backward by ΔS = 20 to 30 mm (Fig. 4c), then lower the lower equalizer beam 10b and the thread 13 to lock both latches 1.
After engaging 5a and 15b (Fig. 4d). The traverse cylinder 17 is actuated to pull the upper and lower back up roll assemblies together with the sled 13 out of the housing 6 according to known means. Also,
The upper and lower back-up roll assemblies are assembled into the housing 6 by reversing the procedure described above.

However, the work of adjusting the position of the latch 15b by the small stroke ΔS described above is difficult when the traverse cylinder 17 has a large capacity (for example, a cylinder diameter of 330 mm,
The stroke is 6,700mm), making this work extremely difficult due to the inertia of the piston and the controllability of the amount of hydraulic oil. Therefore, this adjustment work requires a lot of time and effort, and there is a drawback that the efficiency of the roll rearranging work is reduced, which is a cause of a decrease in productivity.

The present invention has been made in view of the above-mentioned drawbacks in the conventional roll changing operation, and an object of the present invention is to provide a roll changing device for a rolling mill that facilitates the position adjustment of a latch using a traverse cylinder.

The configuration of the roll changing device for a rolling mill according to the present invention that achieves this object is such that a latch attached to a piston shaft of a double-acting traverse cylinder is attached to and detached from a latch provided on a slit on which a roll assembly is placed. In a roll changing device for a rolling mill, the roll assembly is changed by moving the slit through both latches by freely engaging the traverse cylinder and operating the traverse cylinder,
An auxiliary cylinder having a stroke volume equal to the small stroke volume of the traverse cylinder corresponding to the adjustment allowance for attachment and detachment of both the latches is connected to the working fluid supply system of the cylinder chamber on either side of the traverse cylinder. It is characterized by

An embodiment of the present invention will be described below with reference to FIGS. 5 and 6, and the same parts as in the conventional device will be denoted by the same reference numerals and redundant explanation will be omitted. FIG. 5 is a block diagram of one embodiment of the present invention, and FIG. 6 is a block diagram of the auxiliary cylinder in operation.

As shown in the figure, the traverse cylinder 17 is of a double-acting type, and the cylinder chamber 17 on either side thereof
b (reverse cylinder chamber in this embodiment) of the working fluid supply system conduit 19 and the traverse cylinder 17.
The cylinder chamber 20a on one side of the double-acting auxiliary cylinder 20, which is smaller than the one shown in FIG.
It is connected via a solenoid valve 23 to a pump P and a tank T via conduits 24 and 25, respectively. here,
The stroke volume of the auxiliary cylinder 20 is selected so as to be equal to the small stroke volume of the traverse cylinder 17 when the piston shaft 17a is moved by a small stroke ΔS corresponding to the adjustment allowance for attaching and detaching both the latches 15a and 15b mentioned above. do. Further, the stroke volume of the auxiliary cylinder 20 can be changed by moving the adjustment screw 20c in and out, thereby making it possible to respond to changes in the adjustment allowance.

On the other hand, the cylinder chamber 1 of the traverse cylinder 17
7b is connected to a pump P and a tank T via a pipe 19, a pilot check valve 26, a pipe 27, a solenoid valve 28, and pipes 29 and 30, respectively.

Further, the cylinder chamber 17c on the other side of the traverse cylinder 17 is connected to the same pipe line 2 via a pipe line 31, a pilot type check valve 32, a pipe line 33, and a solenoid valve 28.
It is connected to the pump P and the tank T via lines 9 and 30, respectively, and to the tank T via a line 34, a pilot check valve 35, and a line 36.

The backup roll recombination procedure in the apparatus of the present invention having the above configuration will be described below. FIG. 5 shows a state in which the piston shaft 17a of the traverse cylinder 17 is advanced to move the back-up roll assembly placed on the sled 13 to the installation position in the housing 6 of the rolling mill. , both latches 15a, 15b are in abutting engagement with each other on their vertical planes, and the solenoid valves 23, 28
Solenoids A and D are OFF, solenoids B and C
is in the ON state, and the piston 20d of the auxiliary cylinder 20 is pushed by the fluid in the cylinder chamber 17b of the traverse cylinder 17 and moved to the backward limit position. From this state, before retracting the piston shaft 17a of the traverse cylinder 17, in order to release the contact between the latches 15a and 15b, turn off the solenoids A, B, and C, and turn on the solenoid D. . Then, as shown in FIG. 6, the discharge fluid of the pump P is supplied to the cylinder chamber 20b of the auxiliary cylinder 20, the piston 20d moves to the forward limit position, and the fluid in the cylinder chamber 20a on the opposite side of the auxiliary cylinder 20 is discharged. The cylinder chamber 17b of the traverse cylinder 17 passes through the pipes 21 and 19.
At the same time, the fluid in the cylinder chamber 17c on the opposite side of the traverse cylinder 17 is discharged to the tank T through the pipe 34, the check valve 35, and the pipe 36, and the piston shaft of the traverse cylinder 17 is 17a retreats. At this time, since the stroke volume of the auxiliary cylinder 20 is set equal to the small stroke volume of the traverse cylinder 17 that moves the piston shaft 17a by the required small stroke ΔS, the latch 15b is accurately and easily retracted by ΔS.

After that, the sled 13 is raised in the same manner as in the conventional procedure, and the piston shaft 17a of the traverse cylinder 17 is retreated to the predetermined standby position by turning solenoids A and C ON and solenoids B and D OFF. Complete installation of the backup roll assembly.

In addition, when taking out the backup roll assembly offline, it is carried out according to the procedure shown in Fig. 4 as described above, but in this case, the procedure shown in Fig. 4 c
Piston shaft 17a of Olaver cylinder 17 shown in
The retraction of the small stroke ΔS can be easily performed by operating the auxiliary cylinder 20 in the same manner as described above.

Although one embodiment of the present invention has been described above based on the drawings, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, The latch shape, fluid pressure circuit, etc. may also be changed as necessary. Furthermore, the present invention can also be applied to various rolling mills other than cross-roll rolling mills.

As explained in detail above, according to the present invention, an auxiliary cylinder having a stroke volume equal to the small stroke volume of the traverse cylinder corresponding to the adjustment allowance for attaching and detaching the latch is connected to the working fluid supply system of the cylinder chamber of the traverse cylinder. So,
The small stroke movement adjustment of the traverse cylinder to adjust the latch position when changing rolls can be performed extremely accurately, easily, and quickly by operating the auxiliary cylinder, greatly shortening the time for changing rolls and saving labor. can be achieved. Further, since the auxiliary cylinder is small, there is an advantage that the equipment cost is low.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of a pair cross roll type rolling mill, Fig. 2 is a schematic partial side view of its back-up roll recombination device, Fig. 3 is a view taken along the - arrow in Fig. 2, and Fig. 4 a. - d are explanatory diagrams of the latch attachment/detachment procedure during roll rearrangement, Figures 5 and 6 relate to an embodiment of the present invention, Figure 5 is a configuration diagram of an embodiment of the present invention, and Figure 6 is a configuration diagram when the auxiliary cylinder is in operation. In the drawing, 1 is a rolled material, 2a, 2b are work rolls, 3a, 3b are back-up rolls, 4a, 4
b, 5a, 5b are roll jocks, 6 is a housing, 11 is a lowering device, 13 is a thread, 14 is a lifting device, 15a, 15b are latches, 17 is a traverse cylinder, 20 is an auxiliary cylinder, 23, 28 are solenoid valves, 26, 32, and 35 are pilot type check valves, P is a pump, and T is a tank.

Claims (1)

[Claims] 1. A latch attached to the piston shaft of a double-acting traverse cylinder is removably engaged with a latch provided on the slit on which the roll assembly is placed, and the traverse cylinder is actuated to allow the latch to pass through both latches. In a roll changing device for a rolling mill that moves the slit to change the roll assembly, a working fluid supply system in a cylinder chamber on either side of the traverse cylinder is provided with a mechanism for attaching and detaching both the latches. A roll changing device for a rolling mill, characterized in that an auxiliary cylinder having a stroke volume equal to the small stroke volume of the traverse cylinder corresponding to the adjustment allowance is connected.