JP2000263118A - Pinch roll device, method for controlling meandering and hot rolling equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the meandering of a rolled stock with high reliability by simple constitution without bringing about the enlargement of a device and increase in cost. SOLUTION: Relating to a pinch roll device which is provided with a pair of upper and lower pinch rolls 2A, 2B, a positioning cylinder 8L for elevating and lowering one end side of the upper pinch roll 2A and a positioning cylinder 8R for elevating and lowering the other end side of the upper pinch roll 2B, a synchronizing cylinder 11 for restraining by relating their elevating and lowering motions of the positioning cylinders so that the amount of the ascending/ descending displacement of the positioning cylinder 8L and the amount of the ascending/descending displacement of the positioning cylinder 8R are always approximately equalized is arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to hot rolling, and more particularly to a pinch roll apparatus for transporting a rolled material, a meandering control method using the same, and a hot rolling facility.

[0002]

2. Description of the Related Art Rolling equipment is provided with a pinch roll for the purpose of reliably transporting a rolled material, and the rolled steel strip is transported by being rotated while being pressed. At this time, the pinch roll was generally configured to be pressed at a constant pressure by a hydraulic cylinder. Here, it is conventionally known that this pinch roll has an action of suppressing meandering of a rolled material. This is because, when the rolled material is pressed, a restraining force mainly due to friction acts on the lateral movement of the rolled material. In particular, in hot rolling, since the coefficient of friction between the roll and the rolled material is large, a larger restraining force acts than in cold rolling.

However, in order to more reliably suppress the meandering, it is not always sufficient to simply press the load supporting point of the pinch roll with a constant force as described above. This will be described with reference to FIGS.

FIG. 13 shows a calculation model on the assumption that when rolling material is conveyed while being pressed by a pinch roll, the rolled material is meandered for some reason and its center is shifted from the roll center. It is a thing. FIG.
FIG. 4 is a diagram showing a result of analyzing the deflection of the upper roll of the pinch roll using the model. The rolled material was calculated by replacing it with an equivalent spring, and the calculation conditions were as follows: the width B of the rolled material was 1000 mm, and the roll diameter of the pinch roll was 450.
mm a and 1500mm roll length, right and left pressing force of the pinch rolls F _l, the sum of 10 tons of F _r (constant), the lateral movement amount to the left from the roll center of the strip center (off-center amount)
S = 100 mm. The roll had a positive downward deflection.

In FIG. 14, the amount of deflection of the upper roll is
It is larger on the opposite side (right side) of the rolled material.
It can be seen that it bends in a downward-sloping shape above. This indicates that the roll gap increases in the moving direction (left direction) of the rolled material, and that the restraining force against the lateral movement of the rolled material decreases as the moving amount increases. In other words, in this case, if the meandering slightly occurs due to some factor on the rolling mill side (for example, under reduced pressure),
At first, the amount of movement is relatively small, so the restraining force against lateral movement is relatively large, and further lateral movement is suppressed, so that the degree of meandering progress is small, but as the amount of movement increases over time, the restraining force increases. Since the distance becomes smaller, the lateral movement amount gradually increases, and as a result, meandering is accelerated. In addition, the above shows that the amount of reduction in the left and right pinch rolls becomes non-uniform and the opposite side in the moving direction is strongly reduced. As a result, the rolled sheet is bent, thereby further promoting meandering. It is also a factor.

[0006] In order to solve such a point, for example, Japanese Patent Application Laid-Open Nos. 5-123743 and 5-138 have been proposed.
As described in Japanese Patent Publication No. 249, a flow control function is provided between a left and right hydraulic cylinder for applying left and right pressing force of a pinch roll and a hydraulic pressure source for supplying working liquid to the left and right hydraulic cylinders. Servo valves are connected to each other, and when meandering of the rolled material occurs, this is detected by optical detection means such as a camera, and the working liquid is supplied to the hydraulic cylinder where the rolled material has shifted, and A method has been proposed in which meandering is controlled so as to increase the pressing force and thereby return the rolled material in the reverse direction.

[0007]

However, the meandering control method according to the above-described known technique has the following problems. That is, when the servo valve is used, it is necessary to strictly control the cleanliness of the working liquid (for example, pressure oil), and the maintenance and maintenance cost rises. Further, a control circuit for controlling the position of the servo valve is required, which causes a rise in equipment costs. More particularly, in a hydraulic circuit used for hot rolling equipment, it is desirable to use a non-flammable working liquid that does not burn even if it touches the rolled material, but a non-flammable working liquid has poor lubricity due to its properties. It is difficult to apply the servo valve because it is not good. In this case, the meandering control itself becomes impossible. Further, in the hot rolling equipment, due to its properties, the atmosphere around the rolled material and the pinch roll is not very clean, and is often unsuitable as a measurement environment for optical detection means. Therefore, it is difficult to perform highly reliable meandering control.

As described above, according to the known method, it is difficult to suppress the meandering with high reliability without increasing the cost.

In the above-described conventional method of pressing the pinch roll with a constant pressing force, the pressing force of the pinch roll is simply further increased to increase the restraining force due to the frictional force against the lateral movement of the rolled material. It is not inconceivable to sufficiently suppress meandering. However, in this case, it is necessary to adopt a structure capable of withstanding the large pressing force as a whole of the apparatus, and thus the apparatus becomes large in size, which causes a new problem that an increase in installation space, a rise in equipment costs, and the like are caused.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pinch roll device capable of suppressing the meandering of a rolled material with high reliability with a simple structure without increasing the size and cost of the device, a meandering control method using the same, and It is to provide a hot rolling equipment.

[0011]

(1) In order to achieve the above object, the present invention relates to a first pair of upper and lower pinch rolls and a first pinch roll for vertically moving at least one of an upper pinch roll and a lower pinch roll. A first means connected to one end of the corresponding pinch roll in the rolled material width direction to raise and lower the one end, and a corresponding rolled material width of the pinch roll A pinch roll device having a second means connected to the other end side in the direction and raising and lowering the other end side, wherein the vertical displacement of the first means and the vertical displacement of the second means are always Displacement restricting means for restricting the first and second means in association with each other so as to be substantially equal to each other is provided.

The first means and the second means are provided by displacement amount restraining means.
Since the displacement amounts of these means are always substantially equal, the one-end side and the other-end side of the pinch rolls connected to them always have substantially the same vertical displacement amount. Thereby, the deflection amount of the pinch roll during the transport of the rolled material has a substantially line-symmetric distribution in which the center of the roll between one end and the other end is a minimum value and gradually increases toward both ends. By contacting the rolled material with such a uniform deflection shape, meandering of the rolled material is less likely to occur. Also, since the amount of deflection from the center side toward both ends increases, the restraining force against the lateral movement of the rolled material increases as the amount of movement increases, so that, for example, some factor on the rolling mill side (for example, under pressure)
Even if the meandering slightly occurs, the meandering is not further promoted, but rather the force acts in a direction in which the meandering disappears.

(2) In the above (1), preferably,
The first means and the second means each include a hydraulic cylinder driven by a working liquid from a hydraulic pressure source, and the displacement amount restraining means always substantially reduces the working liquid from the hydraulic pressure source. There is a working liquid distribution means equally distributed to the hydraulic cylinder of the first means and the hydraulic cylinder of the second means.

(3) In the above (2), more preferably, the working liquid distribution means includes a first liquid chamber corresponding to the first means, and a second liquid chamber corresponding to the second means. A rod slidably penetrating the first and second liquid chambers; and a rod fixed to the rod to slide in the first liquid chamber and connect the first liquid chamber to the liquid chamber. A first piston for partitioning into a region connected to the pressure source side and a region connected to the first means side; a second piston fixed to the rod, sliding in a second liquid chamber, and A tuning cylinder having a second piston for partitioning the chamber into a region connected to the hydraulic pressure source side and a region connected to the second means side;

(4) In the above (2), preferably, the apparatus further comprises a pressure accumulating means connected to a pipeline from the hydraulic pressure source to the working liquid distribution means.

Thus, the flow of the working liquid carried out through the working liquid distribution means by raising and lowering the first means and the second means can be performed quickly, and the responsiveness can be improved.

(5) In the above (2), preferably, a switching valve capable of selectively connecting the working liquid distributing means to the hydraulic pressure source or the hydraulic pressure tank is provided.

If the switching valve is switched to connect the working liquid distribution means to the tank, the working liquid can be quickly discharged from the inside of the working liquid distribution means, so that the corresponding operation can be promptly performed by the hydraulic cylinder. Can be.

(6) In the above (2), preferably, the working liquid distribution means is connected to one of the bottom side and the rod side of the hydraulic cylinder of the first and second means. The working liquid of a desired constant pressure is always guided to the other of the bottom side and the rod side via a pressure regulating valve.

The same amount of working liquid is always guided to the bottom side (or rod side) of the hydraulic cylinders of the first and second means by the action of the working liquid distribution means. A working liquid of a desired constant pressure is guided to the rod side (or bottom side) of the cylinder via a pressure regulating valve. As a result, the pressing force generated by the hydraulic cylinder is
The pressing force applied to the bottom side (or the rod side) from the working liquid distribution means operating with the priority distribution of the working liquid and the like, and the pressing force due to the constant pressure of the operating liquid applied to the rod side (or the bottom side) via the pressure adjusting valve. And the resultant force (subtracted force). When the hydraulic cylinder is extended and contracted only by the working liquid from the working liquid distributing means, it is sometimes difficult to adjust the magnitude of the pressing force because the operation is performed with priority given to equal flow distribution. By adjusting the pressure of the working liquid to the opposite side of the hydraulic cylinder, the adjustment of the pressing force can be made easier.

Also, for example, the hydraulic pressure from the pressure adjusting valve relating to the hydraulic cylinder of the first means and the hydraulic pressure from the pressure regulating valve relating to the hydraulic cylinder of the second means are set to different values. By setting, it is also possible to set the initial position of the pinch roll obliquely at a desired angle. However,
Since the amount of displacement from the initial position is controlled equally by the working liquid distribution means, even if the displacement occurs, the displacement can be performed while maintaining the oblique angle. Therefore, it is particularly effective when the thickness of the rolled material is not symmetric with respect to the center of the width of the sheet, such as a wedge material.

(7) In the above (2), preferably, the working liquid distribution means is connected to one of the bottom side and the rod side of the hydraulic cylinder of the first and second means. A hydraulic pressure source is connected via a check valve to a conduit connecting one of the bottom side and the rod side of the hydraulic cylinder to the working liquid distribution means.

The same amount of working liquid is always led to the bottom side (or rod side) of the hydraulic cylinders of the first and second means by the action of the working liquid distribution means, and these hydraulic cylinders are operated. If a leak or the like occurs in the pipeline during this time, the bottom side (or rod side) of both hydraulic cylinders regardless of the function of the working liquid distribution means.
In addition, there is a possibility that an equal amount of the working liquid is not introduced. In the present invention, in such a case, a hydraulic pressure source is connected via a check valve to a pipe connecting the bottom side (or rod side) of the hydraulic cylinder and the working liquid distribution means. Even if there is, the leaked working liquid is supplemented by the hydraulic pressure source, and the equal displacement of the expansion and contraction operation of both hydraulic cylinders can be ensured. It is to be noted that, through the check valve, it is possible to prevent the working liquid from flowing back to the outside from the working liquid distribution means in the normal state.

(8) In the above (1), preferably, there is further provided a second elevating means for vertically elevating the at least one pinch roll together with the first elevating means, and the second elevating means is provided. And pressing means for applying a desired constant pressing force to the pinch roll.

At least one of the pinch rolls moves up and down in parallel so that the one end and the other end are equally displaced by the action of the displacement restricting means. At this time, the pinch roll is provided on the second elevating means. A desired constant pressing force is applied to the pinch roll by the pressing means. As a result, the pressing force applied to the pinch roll becomes a combined force of the pressing force applied from the first elevating means operating with the displacement priority and the constant pressing force applied from the second elevating means. In the case of raising and lowering only by the first raising and lowering means, it may be difficult to adjust the magnitude of the pressing force because the operation is performed with priority given to equal displacement. However, it is necessary to provide the second raising and lowering means. This makes it easier to adjust the pressing force by the pinch roll.

Also, for example, the pressing force of the pinch roll toward one end in the width direction of the rolled material and the pressing force toward the other end in the width direction of the rolled material of the second lifting / lowering means are set to different values. Thus, it is possible to set the initial position of the pinch roll obliquely at a desired angle. However, since the displacement from the initial position is controlled equally by the first lifting / lowering means, even if the displacement is made, the displacement can be performed in parallel while maintaining the oblique angle. Therefore, it is particularly effective when the thickness of the rolled material is not symmetric with respect to the center of the width of the sheet, such as a wedge material.

(9) In the above (1), preferably, a first detecting means for detecting vertical pressing force by the first means and the second means is provided.

The first means and the second means are arranged such that when the rolled material starts to meander and the lateral movement in the width direction occurs, the pinch is pinched because the amount of vertical displacement is always substantially constrained by the displacement amount restricting means. The pressing force on one end side in the roll width direction is different from the pressing force on the other end side. Therefore, the first detecting means is provided to detect the vertical pressing force by the first means for raising and lowering one end in the width direction and the vertical pressing force by the second means for raising and lowering the other end in the width direction. Accordingly, when the values of these two pressing forces become different, it is possible to detect that the meandering of the rolled material has started. If this is applied as, for example, a meandering detection signal in a known meandering control technique in a rolling mill, more reliable meandering suppression can be performed.

(10) In the above (1), preferably, at least one of the pinch rolls to which the first lifting / lowering means is connected is connected to both ends in the rolled material width direction of the pinch roll and substantially in a horizontal plane applied to the pinch roll. And a second detecting means for detecting the rotational moment at.

For example, when meandering occurs due to some factor on the rolling mill side (for example, under pressure reduction), the thickness distribution of the rolled material on the outlet side of the rolling mill is such that the outer circumferential side, which is meandering and bent, is thinner and the inner circumferential side is thinner. It gets thicker. On the rolling mill entry side, the speed distribution of the rolled material is relatively slow on the side corresponding to the outer circumferential side and relatively faster on the side corresponding to the inner circumferential side. By this, do not arrange the pinch roll on the entry side,
If the restraining force is not sufficient even if it is arranged, a plate bending in which the meandering bent shape on the output side continues as it is will also appear on the entrance side.

On the other hand, when the pinch roll device of the above (1) is provided on the entry side, the rolled material is basically constrained based on the action of the displacement amount restricting means. Instead, a compressive stress is generated on the side corresponding to the outer peripheral side, and a tensile stress is generated on the side corresponding to the inner peripheral side. By generating stresses in opposite directions at the inner and outer circumferences, that is, at both ends in the rolled material width direction, a rotational moment is generated in the pinch roll in a substantially horizontal plane.

In the present invention, this rotational moment can be detected by providing the second detecting means.
This makes it possible to quickly detect the occurrence of the meandering factor even while the meandering has not yet occurred in the rolled material due to the operation of the displacement amount restricting means. Therefore, if this is applied, for example, as a meandering prediction signal in a known meandering control technique in a rolling mill, not only can meandering be suppressed more reliably, but also it is possible to surely prevent before starting meandering. .

(11) In any one of the above (1) to (10), and preferably, it is attached to a housing post of a rolling mill for rolling the rolled material.

The position of the pinch roll is preferably closer to the roll. This is because the tension distribution reacts sensitively to a slight difference in the elongation percentage of the rolled material, which advantageously acts to prevent meandering. In the present invention, the distance between the pinch roll and the rolling roll can be made as small as possible by being provided along with the housing post of the rolling mill for rolling the rolled material, so that the meandering of the rolled material can be more reliably suppressed. .

(12) In order to achieve the above object, according to the present invention, the above (9) is arranged on at least one of the entrance side and the exit side of the rolling mill, and detected by the first detecting means. The difference in vertical pressing force between the first means and the second means is obtained, and the amount of reduction in the rolling mill is adjusted based on this value to control the meandering of the rolled material.

(13) In order to achieve the above object, the present invention further provides the above (10) on at least one of the entrance side and the exit side of a rolling mill, and the above (10) is detected by the second detecting means. The rolling amount of the rolling mill is adjusted based on the value of the rotating moment to control the meandering of the rolled material.

(14) In order to achieve the above-mentioned object, the present invention also provides a hot-rolling facility in which a plurality of stands of rolling mills are arranged in tandem.
Are installed at least on the entry side or exit side of the rolling mill in the final stand.

In a hot rolling facility in which rolling mills of a plurality of stands are arranged in tandem, a so-called tension feedback mechanism is used while the rolled material is upstream of the rolling mill of the final stand and is bitten by each stand. The probability of meandering is very small. On the other hand, the rear end of the rolled material passes through the rolling mill on the stand one upstream from the last stand,
Meandering is most likely to occur while the rear end of the rolled material is rolled by a final stand rolling mill without tension. Therefore, in the present invention, the pinch roll device described in (1) to (11) is provided at least on the entry side or the exit side of the rolling mill in the final stand, so that the meandering of the rolled material can be more effectively suppressed. it can.

(15) In order to achieve the above object, the present invention also provides a hot rolling facility comprising at least one rolling mill and furnishing a furnace coiler on each of an entrance and an exit of the rolling mill. Any one of (1) to (11) is provided at the entrance of the furnace coiler.

In a so-called Steckel hot rolling facility in which a furnace coiler is provided before and after a rolling mill to repeatedly perform rolling, an expensive material such as stainless steel is generally produced in many cases. In order to improve the yield as much as possible, each rolling pass is required. Each time, the leading and trailing ends of the rolled material are often completely rolled through the bottom. Therefore, sufficient tension could not be applied until the rolling in the rolling mill was completed after the rolled material was separated from the winding drum of the furnace coiler, and meandering was most likely to occur. Therefore, in the present invention, (1) to (1)
By providing the pinch roll device described above in 1) at the entrance of the furnace coiler, meandering of the rolled material can be suppressed more effectively.

[0041]

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

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a partial cross section of the entire structure of the pinch roll device according to the present embodiment, and FIG. 2 is a side view seen from the left side (operation side) in FIG. 1 and 2, the pinch roll device includes an upper pinch roll 2A and a lower pinch roll 2B.

The lower pinch roll 2B has a bearing box 3B
L, 3BR are housing posts 4L, 4
It is fixedly supported on support bases 5L and 5R attached to the side surface of R.

The upper pinch roll 2A is installed so as to be vertically movable by the pressing cylinders 6L, 6R fixed to the housing posts 4L, 4R moving up and down the bearing boxes 3AL, 3AR with a predetermined constant pressing force. The motor (not shown) installed behind the upper and lower spindles 7A, 7B on the driving side (right side in FIG. 1) drives the motor through the spindles 7A, 7B and the universal joints 36A, 36B. At this time, hydraulic cylinders (for example, hydraulic cylinders, the same applies hereinafter) 8L, 8R for positioning the upper pinch roll 2A are further installed on the support bases 5L, 5R, and the bearing box 3AL is provided from the side opposite to the pressing cylinders 6L, 6R. , 3
It moves up and down the AR. That is, the rolled material 1
When the pinch roll 2A is lowered, the pistons 9L, 8R of the hydraulic cylinders 8L, 8R, which are positioning devices, are transported.
The structure is such that the rolled material 1 is pressed while 9R is pressed down.

At this time, the head side (bottom side) of the positioning cylinders 8L, 8R is connected to the tuning cylinder 11 via the conduits 10L, 10R. Tuning cylinder 11
Is the first liquid chamber 11 connected to the positioning cylinder 8L.
aL, the second liquid chamber 11aR connected to the positioning cylinder 8R, and the first and second liquid chambers 11aL and 11aL.
a rod 11b slidably penetrating through aR,
A region 11a which is fixed to the rod 11b and slides in the first liquid chamber 11aL, and connects the first liquid chamber 11aL to a branch portion 14L (described later) of the conduit 14 on the hydraulic pressure source 37 side.
L ₁ and the first piston 11cL and, second One only slides liquid chamber 11aR its second liquid chamber 11aR fluid pressure source is fixed to the rod 11b 37 partitioned into the opposite side region 11AL ₂ and a second piston 11cR partitioned into bifurcation area 11aR ₁ which is connected to 14R (described later) on the side of the conduit 14 and its opposite side area 11aR _2.

The first liquid chamber 11a of the tuning cylinder 11
L regions 11AL ₁ and region 11 of the second liquid chamber 11aR
The working liquid (for example, pressure oil) from the hydraulic pressure source 37 composed of, for example, a hydraulic pump or the like is supplied to the aR ₁ by a pressure reducing valve 1 for pressure adjustment.
After the pressure is set to be constant by the spring 12a in 2, the pressure is supplied through the conduit 14 and the downstream branches 14L and 14R. An accumulator 13 as a pressure accumulating means is branched and connected to the pipe 14 downstream of the pressure reducing valve 12. Such positioning cylinders 8L, 8
Due to the connection relationship between R and the tuning cylinder 11, approximately the same amount of the working liquid always flows into and out of the positioning cylinder 8L and the positioning cylinder 8R. The amounts are forced to be approximately the same.

As described above, the bearing boxes 3AL and 3AR, which rotatably support the upper pinch roll 2A, apply an upward pressing force by the positioning cylinders 8L and 8R and a downward pressing force by the pressing cylinders 6L and 6R. Works. The pressing force of the upper pinch roll 2A against the rolled material 1 is determined by the output load difference between the positioning cylinders 8L, 8R and the pressing cylinders 6L, 6R. Assuming that the downward output load of the pressing cylinders 6L, R is P and the upward output load of the positioning cylinders 8L, 8R is Q, the pressing force R against the rolled material 1 is R.
Becomes R = P−Q. Therefore, the pressing force R can be changed by changing the set pressure of the pressing cylinders 6L and 6R.

In the above, the positioning hydraulic cylinders 8L and 8R constitute first lifting means for raising and lowering at least one of the upper pinch roll and the lower pinch roll in the vertical direction. Are connected to one end of the corresponding pinch roll in the rolled material width direction and constitute first means for raising and lowering the one end, and the hydraulic cylinder 8
R is connected to the other end of the corresponding pinch roll in the rolled material width direction and constitutes second means for raising and lowering the other end.

The tuning cylinder 11 constitutes a working liquid distributing means for distributing the working liquid from the hydraulic pressure source almost equally to the hydraulic cylinder of the first means and the hydraulic cylinder of the second means. Further, the displacement amount for restricting the ascending and descending operations of the first means and the second means in association with each other so that the ascending and descending displacement amount of the first means and the ascending and descending displacement amount of the second means are always substantially equal. The restraining means also constitutes.

Further, the pressing cylinders 6L, 6R constitute a pressing means for applying a desired constant pressing force to the pinch roll, and further, together with the first lifting / lowering means, raise and lower at least one of the pinch rolls in the vertical direction. 2 also constitutes the lifting means.

Next, the operation and operation of this embodiment having the above configuration will be described.

(1-1) Meandering Suppressing Function by Constraining Equal Displacement The positioning cylinder 8 is controlled by the function of the tuning cylinder 11.
The displacement amounts of the pistons 9L and 9R in L and 8R are always substantially equal. Thus, the amount of change in the displacement of the upper pinch roll 2A always slides in parallel from the initial state. As a result, the amount of deflection of the upper pinch roll 2A during the transport of the rolled material 1 has a substantially line-symmetric distribution in which the center of the roll is minimized and gradually increases toward both ends. By contacting the rolled material 1 with such a uniform deflection shape, meandering of the rolled material 1 is less likely to occur. Further, as the amount of deflection increases from the center toward both ends, the restraining force against the lateral movement of the rolled material 1 increases as the amount of movement increases. An example of this effect is shown in FIG.
Shown in

FIG. 3 shows the result of analyzing the deflection of the upper pinch roll 2A in the pinch roll device of the present embodiment (that is, under the condition that the displacements of the right and left pinch roll load points are equal) in the same manner as FIG. 14 described above. FIG.
The rolled material is calculated by replacing it with an equivalent spring. The calculation conditions are as shown in FIG.
The width of the rolled material is B = 1000 mm, the roll diameter of the pinch roll is 450 mm, and the roll length is 150 mm.
0mm, left and right pressing force of the pinch roll F _l, the sum of the F _r 10
Ton, the amount of lateral movement S from the center of the rolled material to the left from the center of the roll is S = 100 mm.

In FIG. 3, the amount of deflection of the upper pinch roll 2A is a minimum value (about 0.017 mm) at the center of the roll, gradually increases toward both ends, and increases at the left end in the figure. 0.03mm, the right end in the figure is also about 0.03m
The distribution is almost line-symmetrical and stays at m. As described above, by contacting the rolled material 1 with a uniform flexure shape,
The meandering of the rolled material 1 is less likely to occur. In addition, the amount of deflection increases from the center toward both ends, that is, the roll gap is narrower at both ends than at the center, so that the constraint on the lateral movement of the rolled material 1 increases as the amount of movement increases. You can see that. Therefore, for example, even if the meandering of the rolled material 1 slightly occurs due to some factor on the rolling mill side (for example, under a reduced pressure), the meandering is not further promoted, and a force acts in a direction in which the meandering disappears. .

At this time, the load acting on the left and right ends of the upper pinch roll 2A is F ₁ = 5.8 tons and F _r = 4.2.
Distributed like tons.

(1-2) Ease of Adjusting the Pressing Force, etc. As described above, the pressing force R against the rolled material 1 is determined by the output load P of the pressing cylinders 6L and 6R and the positioning cylinder 8
It is determined by the difference between the output load Q of L and 8R, and R = P−
Since it is Q, the rolled material 1 can be pressed with a desired pressing force R by changing the set pressure of the pressing cylinder 6.

Here, if the pressing cylinders 6L and 6R are not provided and only the positioning cylinders 8L and 8R are used, the upper pinch roll 2
When raising and lowering A, it is sometimes difficult to adjust the magnitude of the pressing force by the upper pinch roll 2A because the operation is performed with priority given to the equal displacement, but as described above, the constant pressing force P Pressing cylinder 6 that presses downward with
By providing L and 6R, adjustment of the pressing force by the upper pinch roll 2A can be made easier.

At this time, the left and right pressing cylinders 6L,
It is also possible to set by changing the set pressing forces P ₁ and P ₂ of 6R. In this case, the gap between the initial upper and lower pinch rolls 2A and 2B with respect to the rolled material 1 can be set to be inclined at a desired angle without being made parallel. With the same amount, the slide is maintained while maintaining a parallel state with respect to the initial roll gap. Such a setting is particularly effective when the sheet thickness distribution is not symmetric with respect to the sheet width center, for example, when the rolled material is a wedge material.

(1-3) Improvement of Responsiveness by Accumulator By connecting the accumulator 13 by branching off from the pipe line 14, the system can respond to the position change of the upper pinch roll 2A without delay. That is, by placing the accumulator 13 between the pressure setting pressure reducing valve 12 and the tuning cylinder 11 which cannot be said to be fast responsiveness, the inflow / outflow of the working fluid in the tuning cylinder 11 due to the position fluctuation of the upper pinch roll 2A. Can be quickly performed by the accumulator 13. In general, the position of the pinch roll fluctuates very little, so that the capacity of the accumulator 13 is as small as several liters.

(1-4) Effect of Installation on Housing Post In general, it is desirable that the installation position of the pinch roll be closer to the rolling roll. This is because the tension distribution reacts sensitively to a slight difference in the elongation percentage of the rolled material, which advantageously acts to prevent meandering. The pinch roll device of the present embodiment can minimize the distance between the pinch rolls 2A, 2B and the rolling rolls by being provided alongside the housing posts 4L, 4R of the rolling mill for rolling the rolled material 1. ,
This also makes it possible to more reliably suppress the meandering of the rolled material 1.

As described above, according to the present embodiment, the function of the tuning cylinder 11 causes the upper pinch roll 2 to move.
The displacement of the load points at both ends of A is controlled equally (high parallel rigidity pinch roll). Thereby, since the upper pinch roll 2A is in contact with the rolled material 1 with a uniform bending shape with the center of the roll being substantially line-symmetrical, the meandering of the rolled material 1 is less likely to occur. Further, even when the meandering occurs, the meandering is not promoted any more, but rather the force acts in a direction in which the meandering disappears. Therefore, unlike the prior art that simply applies a large constant pressing force or uses a servo valve,
It is possible to suppress the meandering of the rolled material with high reliability with a simple configuration without increasing the size of the apparatus and increasing the cost.

A second embodiment of the present invention will be described with reference to FIGS. This embodiment is an embodiment in which the tuning cylinder 11 is connected to the pressing cylinders 46a and 46b. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description will be appropriately omitted.

FIG. 4 is a front view showing the external structure of the pinch roll device according to the present embodiment, FIG. 5 is a side view seen from the left side (operation side) in FIG. 4, and FIG. FIG. 11 is a hydraulic circuit diagram illustrating a hydraulic pressure supply system related to 11.

In FIG. 4, FIG. 5, and FIG.
In the pinch roll device according to the present embodiment, the pinch rolls 2A and 2B are not mounted on the housing posts 4L and 4R, but are incorporated in the stand 15 alone.

The rolling material 1 is pressed by directly moving the upper pinch roll 2A up and down by the pressing cylinders 46L and 46R without using the positioning devices 8L and 8R as in the first embodiment. . Accordingly, the tuning cylinder 11 is connected to the pressing cylinders 46L and 46R. That is, as shown in FIG. 6, the head side (bottom side) of the pressing cylinders 46L and 46R is
L, 10R, the first liquid chamber 11 of the tuning cylinder 11
aL and the second liquid chamber 11aR.

[0066] The first area of the liquid chamber 11AL 11AL ₁ and the second liquid chamber region of 11aR 11aR of the tuning cylinder 11 ₁
A working liquid (for example, pressure oil, the same applies hereinafter) from a hydraulic pressure source (not shown) is supplied to a spring 1 by a pressure reducing valve 12 for adjusting pressure.
2a and a constant pressure set by the exciting force of the solenoid 12b in accordance with a control signal from a control means (not shown), and then via the electromagnetic switching valve 19, the pipe 14 and the downstream branch portion 14L thereof. , 14R. An accumulator 13 as a pressure accumulating means for increasing the response of the tuning cylinder 11 and a relief valve 21 for suppressing a pressure rise at the time of an unexpected abnormal pressure increase are branched and connected downstream of the pressure reducing valve 12 of the pipe line 14. ing.
At this time, the electromagnetic switching valve 19 is connected to the solenoids 19a, 19
b, the solenoid valve 19a is energized to switch to the left position in FIG.
And the working fluid from the hydraulic pressure source
When the solenoid 19b is excited and switched to the right position in FIG. 6, the tuning cylinder 11 is communicated with a tank line 38 that communicates with a hydraulic tank (not shown), and the working fluid in the tuning cylinder 11 is supplied to the hydraulic tank. To be discharged.

On the other hand, on the rod side of the pressing cylinders 46L, 46R, a working liquid from a hydraulic pressure source (not shown) is supplied with springs 39La, 39R at pressure reducing valves 39L, 39R for pressure adjustment.
After the pressure is set to a constant pressure set by the energizing force of the solenoids 39Lb and 39Rb according to the urging force of 39Ra and a control signal from a control means (not shown), the electromagnetic switching valve 20L,
Via 20R, it is supplied via conduits 40L, 40R. In addition, the pressure reducing valves 39L, 3
Similarly to the above, the accumulator 24 is located downstream of 9R.
L and 24R and the relief valves 23L and 23R are branched and connected. The electromagnetic switching valves 20L and 20R are two-position switching valves provided with solenoids 20La and 20Ra and solenoids 20Lb and 20Rb, like the electromagnetic switching valve 19. Then, the solenoids 20La and 20Ra are excited, and
When the position is switched to the middle left position, the working fluid from the hydraulic pressure source is brought into communication with the conduits 40L and 40R to press the pressing cylinder 46.
L, 46R. On the other hand, the solenoid 20Lb, 2
When 0Rb is excited to be switched to the right position in FIG. 6, a tank line 39 that is connected to a hydraulic tank (not shown) is provided.
L and 39R are communicated with the rod sides of the pressing cylinders 46L and 46R, and the working liquid is discharged to the hydraulic tank via check valves 22L and 22R for bypassing the pressure adjusting valves 39L and 39R, and the line 10L. , 10R and pipes 42L, 42 provided with check valves 25L, 25R on the way.
R presses the working liquid from the hydraulic pressure source through the pressing cylinder 46.
L and 46R are supplied to the head side.

When pressing the rolled material 1, the electromagnetic switching valves 19L and 19R and the electromagnetic switching valve 20 are used in a state where they are switched to the left position in FIG. The pressing force R 'is determined by the electromagnetic switching valve 1
9 and the pressing cylinder 46L, 4 via the tuning cylinder 11
The difference between the pushing force P 'generated by the liquid pressure generated on the head side of the 6R and the rising force Q' generated by the liquid pressure applied to the rod sides of the pressing cylinders 46L and 46R via the electromagnetic switching valves 20L and 20R. Then, R '= P'-Q'. Therefore, the pressure reducing valve 12 and the pressure reducing valves 39L, 39R
Solenoids 12b and solenoids 39Lb, 39Rb
By controlling the above-mentioned control signal, the pressing force R 'can be changed.

Further, the pressing cylinder 46L,
When it is desired to raise 46R, the solenoid 19a of the electromagnetic switching valve 19 is excited to switch to the right position in FIG. 6, and the pressure on the head side of the pressing cylinders 46L and 46R via the tuning cylinder 11 is reduced. Although this can be performed by lowering the set pressure of the pressure reducing valve 12, the electromagnetic switching valve 19 is used to increase the pressure more quickly.

Referring back to FIGS. 4 and 5, the pinch roll device of the present embodiment is also arranged such that the bearing boxes 3AL, 3AR and 3BL, 3BR of the upper and lower pinch rolls 2A, 2B are moved in a horizontal direction (perpendicular to the axis) in a substantially horizontal plane. Lateral pressing cylinders 16A and 16B for pressing on one side are provided on both the operating side and the driving side (however, only the operating side is shown). This removes the backlash in the horizontal direction of the upper and lower pinch rolls 2A, 2B, and places the load cells 17A, 17B between the cylinder pistons 16Aa, 16Ba and the bearing boxes 3AL, 3AR and 3BL, 3BR. In the meandering, the left and right couple (lateral rotation force) acting as a reaction force of the lateral rotation moment acting on the upper and lower pinch rolls 2A and 2B is detected. Note that A in FIG.
As shown in FIG. 7, which is a view from the direction of the arrow, the bearing housing 3A
The contact portions 41 of the lateral load supporting points L, 3AR and 3AL, 3AR have a smooth convex curve shape instead of a flat surface, and can eliminate unnecessary restraint on the lateral rotational force at the contact position and can measure accurately. It has become.

Further, the pinch roll device of the present embodiment
Similarly to the above, for the purpose of detecting the difference between the left and right pressing forces during the meandering of the rolled material 1, the load cells 18L, between the pistons 46La, 46Ra of the pressing cylinders 46L, 46R and the bearing box 3A of the upper pinch roll 2A. 18R is provided so as to sandwich it.

In the above, the pressing cylinder 46
L, 46R constitute a first elevating means for vertically elevating at least one of the upper pinch roll and the lower pinch roll, and the pressing cylinder 46L is provided at one end of the corresponding pinch roll in the rolled material width direction. A first means for moving the one end side up and down
R is connected to the other end of the corresponding pinch roll in the rolled material width direction and constitutes second means for raising and lowering the other end.

Further, the electromagnetic switching valve 19 constitutes a switching valve capable of selectively connecting the working liquid distribution means to a hydraulic pressure source or a tank, and the pressure reducing valve 39 is provided on the bottom and the first and second means. On the other side of the rod side, a pressure regulating valve that always guides the working liquid of a desired constant pressure is configured, and the pipelines 10L and 10R are
A conduit connects one of the bottom side and the rod side of the hydraulic cylinder to the working liquid distribution means.

Further, the load cells 18L and 18R constitute first detecting means for detecting the vertical pressing force by the first means and the second means, respectively.
A, 17B are connected to both ends of at least one of the pinch rolls to which the first lifting / lowering means is connected in the rolled material width direction;
A second detecting means for detecting a rotational moment applied to the pinch roll in a substantially horizontal plane is constituted.

Next, the operation and operation of this embodiment having the above configuration will be described.

(2-1) Meandering Suppressing Effect by Constraining Equal Displacement As in the first embodiment described above, also in this embodiment, the function of the tuning cylinder 11 causes the pressing cylinder 46
The displacement amounts of the pistons 46La and 46Ra at L and 46R are always substantially equal, and the change amount of the displacement of the upper pinch roll 2A always slides in parallel from the initial state. Accordingly, similarly, the deflection of the upper pinch roll 2A during the transport of the rolled material 1 has a substantially line-symmetric uniform bending shape in which the amount of deflection gradually increases toward both ends, and the meandering of the rolled material 1 hardly occurs. Since the restraining force against the lateral movement of the rolled material 1 increases as the amount of movement increases, the meandering of the rolled material 1 is not promoted, but rather the force acts in a direction in which the meandering disappears.

(2-2) Ease of Adjusting the Pressing Force, etc. The pressing force R ′ against the rolled material 1 is determined by the pressing cylinder 46L,
Depressing force P 'due to liquid pressure generated on the head side of 46R
And the rising force Q ′ due to the liquid pressure applied to the rod side of the pressing cylinders 46L and 46R, and R ′ =
P'-Q ', the pressure reducing valve 12 and the pressure reducing valve 39L,
39R solenoid 12b and solenoid 39Lb, 3
By controlling the control signal to 9Rb, the pressing force R 'can be easily adjusted, and the rolled material 1 can be pressed with a desired pressing force R'.

Here, as in the case of the positioning cylinders 8L and 8R of the first embodiment, there is no supply of the working liquid to the rod side of the pressing cylinders 46L and 46R via the conduits 40L and 40R, and the operation to the head side. When the upper pinch roll 2A is moved up and down only by the outflow / inflow of the liquid, since the operation is performed with priority given to equal displacement, it may be difficult to adjust the magnitude of the pressing force by the upper pinch roll 2A. However, as described above, the working liquid is also supplied to the rod sides of the pressing cylinders 46L and 46R, and the pressure of the working liquid can be adjusted by the pressure reducing valves 39L and 39R. Can be made easier.

At this time, the left and right pressing cylinders 46
L, the set lifting force Q ' ₁ applied to the rod side of 46R,
It is also possible to set by changing the Q _'2. in this case,
As described in the above (1-2), the gap between the initial upper and lower pinch rolls 2A and 2B with respect to the rolled material 1 can be set at a desired angle with an inclination, and the subsequent displacement is parallel to the initial roll gap. It can be made to slide while maintaining the state. Such a setting is also particularly effective when the thickness distribution is not symmetrical with respect to the center of the width of the plate.

(2-3) Improvement of Responsiveness by Accumulator Similar to the above (1-3), the pipe 14 and the pipes 40L, 4
Accumulators 1 branched from 0R and connected
3 and the accumulators 24L and 24R allow the system to respond to the position change of the upper pinch roll 2A without delay.

(2-4) Measures for Leakage of Working Liquid A substantially equal amount of working liquid is always guided to the head side of the pressing cylinders 46L and 46R by the operation of the tuning cylinder 11, and the pressing cylinders 46L and 46R are operated. But the pressing cylinders 46L and 46R and the tuning cylinder 11
If the working liquid leaks inside or between the pipes 10L and 10R, there is a difference in the amount of liquid held between the left and right pressing cylinders 46L and 46R and the tuning cylinder 11. Therefore, despite the above function of the tuning cylinder 11, both pressing cylinders 46L, 4
There is a possibility that the same amount of the working liquid is not guided to the head side of the 6R, and the upper pinch roll 2A operates while being inclined.

In the present embodiment, the pressing cylinder 46
Pipes 42L, 42R provided with check valves 25L, 25R are branched and connected to pipes 10L, 10R connecting the head side of L, 46R and the tuning cylinder 11, respectively.
The working liquid can be supplied from the hydraulic pressure source via the right side position of 20R in FIG. Accordingly, even in such a case, the initial reference positions of the pressing cylinders 46L, 46R are adjusted by supplementing the leaked and insufficient working liquid from the hydraulic pressure source, and the expansion and contraction of both the pressing cylinders 46L, 46R are performed. Equal displacement of the operation can be ensured. Specifically, at the time of this reference position adjustment, the upper pinch roll 2A is lowered until it comes into contact with the lower pinch roll 2B.
L and 20R may be switched to the right position in FIG. 6 to replenish the working liquid. The check valves 25L and 25R are
This is to prevent the working liquid from flowing back from the tuning cylinder 11 to the hydraulic tank when the normal rolled material 1 is pressed.

(2-5) Application to Meandering Control on the Rolling Mill Side by Detecting Left and Right Pressing Forces In the present embodiment, the pressing cylinders 46L, 46R
As described above, when the rolled material 1 starts to meander and the lateral movement in the width direction occurs, the pressing and pressing by the pressing cylinder 46L is performed, as described above, since the amount of vertical displacement is always substantially constrained by the tuning cylinder 11. The pressing force by the cylinder 46R becomes different. Therefore, the pressing forces are detected by the load cells 18L and 18R provided on both the operating side and the driving side, and when it is found that a predetermined difference has occurred between the pressing forces, the meandering of the rolled material starts. It can detect that it has started. Then, this is determined by, for example, a known meandering control technique in a rolling mill (for example, Japanese Patent Application Laid-Open Nos. Hei 6-269825 and Hei 11-1021).
No. 1, JP-A-9-38710, etc.), it is possible to more reliably suppress the meandering if applied as a meandering detection signal.

When the load detected by the load cells 18L and 18R is very small, a highly sensitive detection accuracy is required, and the load cells 18L and 18R may be buried in noise.
Hereinafter, this point will be discussed.

[0085] FIG. 8 is the case where the strip 1 is meandering, deviation amount from the top pinch roll 2A center of the strip 1 and the (off-center amount) S, the right and left pressing force F _l, the ratio of F _r (F _r
/ F _l ) is calculated. The calculation conditions are the same as those shown in FIG. 14 described above. The width B of the rolled material is 1000 mm, and the roll diameter of the pinch roll is 4 mm.
50mm in and 1500mm roll length, right and left pressing force F _l of pinch rolls, the sum of 10 tons of F _r (constant), the lateral movement amount to the left from the roll center of the strip center (off-center amount) at S = 100 mm is there. 8, the larger the off-center amount S in the left direction, because the left pressing force F _l is increased by right pressing force F _r decreases, the value of F _r / F _l is small. Then, at this time, F _r / F _l 0.
At this time, it can be seen that a load deviation of about 5% has already occurred on the left and right. Normally, a load deviation of about several percent can be detected with sufficient accuracy, so that it has been found that the meandering control based on the detection of the off-center amount S of the rolled material 1 is sufficiently effective.

Also, in this case, compared to the method of optically detecting the position of a rolled material as described in the related art, the reliability and reliability are high and the cost is low even in a very bad measurement environment. In addition, there is an effect that it is possible to perform accurate detection.

(2-6) Lateral couple (rotational moment)
Application to meandering control on rolling mill side by detection This principle will be described with reference to FIG. FIG. 9 shows a case where a pinch roll is arranged on the entrance side of the rolling roll, and when there is no restraint on the rolled material on the exit side of the rolling roll, the right side of the rolling roll is depressurized. In this case, the delivery side plate thickness after rolling has a distribution in which the right side becomes thinner as shown in the figure.

Here, when there is no pinch roll, the direction of sheet bending of the rolled material on the roll roll entry side has a shape curved to the left side as shown by a broken line. This is a phenomenon that occurs because the speed distribution in the width direction of the rolled material on the incoming side is relatively slow on the right side and is fast on the left side.If rolling is continued as it is, the rolled material suddenly moves leftward on the outgoing side. It will start meandering.

On the other hand, in the pinch roll device of the present embodiment, since the rolled material 1 is basically restrained by the pinch roll 2 pressed through the tuning cylinder 11, No bending occurs. However, instead, a tension distribution as shown acts on the rolled material 1.

That is, considering the plate center as a reference,
As the tension distribution related to the rotational force, a compressive stress is generated on the right side and a tensile stress is generated on the left side. Now, the center of the rolled material 1 and the center of the pinch roll 2 coincide with each other, and if the tension at the plate edge portion related to the rotational force is represented by △ σ, and the plate thickness and the plate width are represented by H and B, the rolled material 1 The force applied to the minute part whose distance from the center of the plate width is x, width is dx, and thickness is H is dx × H × △ σ = △ σ · H · dx. Assuming that, the rotational moment Mσ applied to the entire pinch roll 2 can be calculated by integrating this force in the width direction.

[0091]

(Equation 1)

[0092]

Here, the upper and lower pinch rolls 2A and 2B are
Since the cylinders 16A and 16B are constrained in the rotational direction, a reaction force corresponding to the rotational moment M is generated. In the present embodiment, this reaction force is applied to the load cells 17A, 1A.
7B. Thereby, even while the meandering has not yet occurred in the rolled material 1, it is possible to quickly detect that the cause of the meandering has already occurred. Therefore, this is applied as a meandering prediction signal in, for example, a known meandering control technique in a rolling mill (for example, JP-A-6-269825, JP-A-11-10211, and JP-A-9-38710). By doing so, not only can the meandering be suppressed more reliably, but also quick and reliable prevention can be made before the meandering starts.

The detectability of the load cells 17A and 17B will be discussed below in the same manner as in the above (2-5).

Considering the example shown in FIG. 9, the restraining moment Mμ caused by the frictional force between the pinch roll 2 and the rolled material 1 is such that the friction coefficient is μ and the pressure distribution load p acting on the rolled material 1 is constant. Assuming that

[0096]

(Equation 2)

Can be evaluated. Therefore, the constraint load F on one side at the lateral load support point is represented by the distance L between the load support points.
F = μpB ² / 4L

Here, as normal operating conditions, μ = 0.
3, p · B = 10 tons, L = 1500 mm, B = 100
If 0 mm, F = 0.5 ton from the above equation. Therefore, it was found that the measurement was sufficiently possible unless the lateral pressing load was excessively large.

The load cell 18 for detecting the lateral rotation force
Need only be provided for either one of the upper and lower pinch rolls 2A and 2B, but it is desirable to perform the measurement on both sides for accurate measurement.

As described above, also in the present embodiment, the displacement of the load points at both ends of the upper pinch roll 2A is controlled equally by the function of the tuning cylinder 11 as in the first embodiment. Is less likely to occur. Further, even when the meandering occurs, the meandering is not promoted any more, but rather the force acts in a direction in which the meandering disappears.
Therefore, without increasing the size and cost of the device,
With a simple configuration, highly reliable rolling material meandering suppression can be achieved.

In the second embodiment, the load cells 17 and 18 are used as means for detecting the right and left pressing force and the lateral rotation couple. However, the present invention is not limited to this, and the cylinders 46L, 46R and 16A, 16A, It can also be detected by measuring the pressure of 16B. However, depending on the cylinder diameter, when measured at this cylinder pressure, the sensitivity to the load is reduced by the pressure receiving area of the cylinder. Therefore, considering this, from the viewpoint of the detection response, the load cells 17 and It is desirable to measure the load directly at 18.

Further, in the hydraulic circuit shown in FIG. 6 of the second embodiment, when the pressing cylinders 46L and 46R are raised, the electromagnetic switching valve 19 is set to the right position and the tuning cylinder 11
Pressing cylinders 46L, 4
6R will take a full stroke, and it may take time to ascend and descend. Therefore, a modification in which this is desired to be improved will be described with reference to FIG.

FIG. 10 is a partial circuit diagram showing the configuration of the main part of this modification. The difference from FIG.
The front electromagnetic switching valve 19 is replaced by a three-position electromagnetic switching valve 34, and the tuning cylinder 11 and the pressing cylinder 46 are replaced.
That is, a pilot check valve 35 is added to the pipelines 10L and 10R between L and 46R. The method of using the electromagnetic switching valve 34 is basically the same as that of the electromagnetic switching valve 19.

That is, when pressing the rolled material 1 by lowering the pressing cylinders 46L and 46R, the solenoid 3
4b is excited to switch the electromagnetic switching valve 34 to the left position in FIG. In this case, the pilot pressure causes the pilot check valve 35 to be in an open state, and has the same function as in FIG.

On the other hand, when raising the pressing cylinders 46L and 46R, the solenoid 34a is excited to switch the electromagnetic switching valve 34 to the right position in FIG. This allows
The working liquid in the tuning cylinder 11 is drained to the hydraulic tank,
Since the pressure on the head side of the pressing cylinders 46L and 46R is relatively smaller than that on the rod side,
L and 46R rise.

During the ascent, the pressing cylinders 46L, 4L
When it is desired to stop 6R, the excitation of the solenoid 34a is stopped. Then, with return to the electromagnetic switching valve 34 is the neutral position by the biasing force of the spring 34c _1, 34c _2, pressure cylinder 46L, the pilot check valve 35 by back pressure from 46R flow of the working liquid (pressure cylinder 46L, 4
6R head side → Tuning cylinder 11) is shut off. In this way, the pressing cylinders 46L, 46R
Can be stopped on the way up. When the pressing cylinders 46R, 46R are lowered again from this position, the solenoid 34b is again excited to set the electromagnetic switching valve 34 in FIG.
It may be switched to the middle left position.

According to this modification, the pressing cylinders 46L and 46R can be stopped during the ascent, so that the time required to descend after the ascent can be shortened.

The pinch roll devices according to the first and second embodiments are particularly useful where the plate thickness is small. This is because a large tension can be generated with a relatively small pressing force as compared with a case where the plate thickness is large.

Further, in the first and second embodiments, the tuning cylinder 11 is used as the working liquid distribution means for always distributing the working liquid from the hydraulic pressure source to the two cylinders substantially equally. The invention is not limited to this, and for example, a so-called known flow dividing valve having an equal flow distribution function may be used.
In this case, a similar effect is obtained.

Further, in the first and second embodiments, the pressing force application direction (upward or downward) of each of the cylinders 6, 8, 46 is not limited to the above case, and vice versa. good. In this case, the head side (bottom side)
It is needless to say that the same effect can be obtained by appropriately reversing the pipe connection relationship between the rod and the rod side.

In the first and second embodiments, the lower pinch roll 2B is fixed and the upper pinch roll 2B is fixed.
Although A is moved up and down, the lower pinch roll 2B may be moved up and down. It is also conceivable to raise and lower both the upper and lower pinch rolls 2A and 2B.
In these cases, a similar effect is obtained.

A third embodiment of the present invention will be described with reference to FIG. The present embodiment is an embodiment in which the pinch roll device of the first or second embodiment is applied to a hot rolling facility in which a plurality of stand rolling mills are arranged in tandem. Portions common to the first and second embodiments are denoted by the same reference numerals, and description thereof will not be repeated.

FIG. 11 is a layout diagram of the hot rolling equipment according to the present embodiment. In FIG. 11, a plurality of hot finish rolling mills 26 (three in this example) are provided, and the rolled material 1 is provided in the finish rolling mill trains 26C and 26C.
After passing through 6B and 26A, passing through the cooling area 28 on the output side table, and passing through a pinch roll 29 for guiding the tip, it is wound in a coil shape by the down coiler 30. The pinch roll device 27 according to the first embodiment (or the second embodiment, hereinafter the same) is disposed before and after the final rolling mill 26A.

The operation and effect of this embodiment will be described below.

In general, in a hot rolling facility in which a plurality of rolling mills are arranged in tandem, a so-called tension feedback is performed while a rolled material is located upstream of the last rolling mill and is bitten by each stand. The probability of meandering by the mechanism is extremely small. This tension feedback mechanism will be described below with reference to FIG.

As described above with reference to FIG. 9, when the rolled material is constrained on the entry side of a certain roll, a tension distribution as shown occurs on the entry side of the roll. Here, in steel strip rolling, in general, the greater the tensile tension, the more the rolled material can be elongated with a small rolling load. Therefore, FIG.
In the tension distribution state of, the rolled material naturally transitions to a state where the left side of the rolled material is stretched (rolled down) unless control is performed to maintain this state. This coincides with the direction of compensating for the pressure drop (right side) in FIG. 9, that is, the direction of preventing meandering. This phenomenon is a characteristic of rolling when tension is applied, and this is what is called a tension feedback mechanism. In the hot rolling equipment of the present embodiment, the rolled material 1 is supplied to the rolling mills 26C and 26 of each stand.
While being engaged between the b and 26A, the tension is applied by the rolling rolls of each rolling mill, so that the meandering hardly occurs due to the tension feedback mechanism.

On the other hand, while the trailing end of the rolled material 1 passes through the rolling mill 26B of the stand one upstream from the final stand, and the trailing end of the rolled material is rolled without tension by the final stand rolling mill 26A, the rolling is continued. Material 1 between mill 26b and rolling mill 26A
Is in a tensionless state, so that meandering is most likely to occur. Therefore, in the present embodiment, the above-described pinch roll device 2
By providing 7 on the entrance side and exit side of the rolling mill 26A of the final stand, meandering of the rolled material 1 can be more effectively suppressed.

The installation location of the pinch roll device 27 at this time is preferably as close as possible to the rolling mill 26A.
Needless to say, it is most ideal to directly attach to the housing post of the rolling mill as in the first embodiment.

Further, the pinch roll device 27 may not be provided on both the entrance side and the exit side of the rolling mill 26A of the final stand, and either one may be provided. Also, the final stand rolling mill 26A
In addition, it goes without saying that it may be installed on the entrance and exit sides of other rolling mills 26B and the like to ensure completeness.

The fourth embodiment of the present invention will be described with reference to FIG. This embodiment is another embodiment in which the pinch roll device of the first or second embodiment is applied to a hot rolling facility. Portions common to the first to third embodiments are denoted by the same reference numerals, and description thereof will not be repeated.

FIG. 12 is a layout diagram of the hot rolling equipment according to the present embodiment. In FIG. 12, first, furnace coilers 32A and 32B provided with a winder in a heating furnace before and after a hot rolling mill 31 upstream of a pass line.
And a Steckel rolling equipment 50 for performing rolling repeatedly. And each furnace coiler 32A, 3
The pinch roll device 27 according to the first embodiment is provided at the entrance of 2B (that is, the downstream side in the pass line direction in the furnace coiler 32A, and the upstream side in the pass line direction in the furnace coiler 32B).

Further, in order to increase the production amount and produce a thin plate, two finishing mills 33A and 33B are arranged after the Steckel rolling equipment 50. And the rolling mill 33A of the first stand installed after the Steckel rolling equipment 50 and the rolling mill 3 of the next final stand
The pinch roll 27 is also arranged on the entry side of 3B.

The function and effect of this embodiment will be described below.

(4-1) Action and Effect in Steckel Rolling Equipment In many cases, the Steckel hot rolling equipment 50 produces expensive materials such as stainless steel. In order to improve the yield as much as possible, each rolling pass is performed. In addition, the leading and trailing ends of the rolled material 1 are often completely rolled through the bottom. Therefore, sufficient tension cannot be applied until rolling is completed in the rolling mill 31 after the rolled material 1 is separated from the winding drums 32Aa and 32Ba of the furnace coils 32A and 32B, and meandering is most likely to occur. It was easy to happen. Once meandering occurs at the rear end, sheet bending or the like occurs, and the winding operation in the next rolling becomes more and more difficult. Therefore, in the Steckel rolling equipment, particularly strong meandering resistance tends to be desired. In such Steckel rolling equipment,
Conventionally, a normal pinch roll device has been installed at the furnace coiler entrance (for example, near the entrance of the heating furnace) in order to smoothly take up the rolled material 1, but this alone is not enough to suppress meandering. Met.

Accordingly, in the present embodiment, the pinch roll device 27 is accordingly connected to the furnace coiler 32A,
It is provided at the entrance of 32B. Thereby, the meandering of the rolled material can be suppressed more effectively.

(4-2) Operation and Effect After the Steckel Rolling Equipment In the present embodiment, the pinch roll devices 27 are also provided on the entrance sides of the finishing rolling machines 33A and 33B after the Steckel rolling equipment 50, respectively. This is for the following reasons.

That is, when the finishing rolling mills 33A and 33B are provided after the Steckel rolling equipment 50, the distance between the Steckel rolling mill 31 and the first finishing rolling mill 33A is relatively large due to the existence of the furnace coiler 32B. It has to be long (for example, about 10 m), so that the time for rolling the rear end of the rolled material 1 without tension also increases.
In addition to this, the final thickness of the Steckel mill 31 is relatively thin (for example, about 2 mm), so that meandering is particularly likely to occur.

Therefore, in the present embodiment, by providing the pinch roll device 27 on the entrance side (or on the exit side) of the finishing mill 33A of the first stand after the Steckel rolling equipment 50, the effect can be obtained. The meandering of the rolled material can be effectively suppressed.

The significance of disposing the pinch roll device 27 on the entry side (or on the exit side) of the final finishing mill 33B is the same as in the third embodiment.

[0130]

According to the present invention, the displacement restricting means always makes the vertical displacement of the first means substantially equal to the vertical displacement of the second means, so that the pinch roll becomes closer to the roll center. Is in contact with the rolled material with a uniform deflection shape having a substantially line-symmetric center, so that the rolled material is less likely to meander. Further, even when the meandering occurs, the meandering is not promoted any more, but rather the force acts in a direction in which the meandering disappears. Therefore, unlike conventional techniques in which only a large constant pressing force is applied or a servo valve is used, it is possible to suppress the meandering of a rolled material with a simple configuration and with high reliability without increasing the size and cost of the apparatus. Can be.

[Brief description of the drawings]

FIG. 1 is a front view, partially in section, showing the entire structure of a pinch roll device according to a first embodiment of the present invention.

FIG. 2 is a side view as viewed from the left side (operation side) in FIG.

FIG. 3 is a diagram showing a result of analyzing a deflection of an upper pinch roll in the pinch roll device of FIG. 1;

FIG. 4 is a front view illustrating an external structure of a pinch roll device according to a second embodiment of the present invention.

FIG. 5 is a side view as viewed from the left side (operation side) in FIG.

6 is a hydraulic circuit diagram showing a hydraulic pressure supply system related to a tuning cylinder of the pinch roll device of FIG.

FIG. 7 is a view from arrow A in FIG. 5;

FIG. 8 shows the amount of deviation (off-center amount) of the rolled material from the center of the upper pinch roll when the rolled material is meandering;
It is a figure showing the result of having computed the relation with the ratio of right and left thrust.

FIG. 9 is a view showing a case where a pinch roll is arranged on an entrance side of a rolling roll, and when there is no restraint on a rolled material on an exit side of the rolling roll, the right side of the rolling roll is depressurized;

FIG. 10 is a partial circuit diagram showing a configuration of a main part of a modified example relating to the elevation of the pressing cylinder.

FIG. 11 is a layout view of a hot rolling facility according to a third embodiment of the present invention.

FIG. 12 is a layout view of a hot rolling facility according to a fourth embodiment of the present invention.

FIG. 13 is a diagram showing a calculation model when assuming a case where meandering occurs in the rolled material for some reason and the center thereof is shifted from the roll center when the rolled material is conveyed while being pressed by a pinch roll. is there.

FIG. 14 is a diagram illustrating a result of analyzing the deflection of the upper roll of the pinch roll using the model of FIG. 13;

[Explanation of symbols]

Reference Signs List 1 Rolled material 2A Upper pinch roll 2B Lower pinch roll 4L, R Housing post 6L, R Press cylinder (press means, second elevating means) 8L Positioning hydraulic cylinder (first means,
8R positioning hydraulic cylinder (second means,
1st raising / lowering means) 10L, R pipeline 11 tuning cylinder (working liquid distribution means, displacement amount restricting means) 11aL first liquid chamber 11aR second liquid chamber 11b rod 11cL first piston 11cR second piston 13 Accumulator (accumulator) 17A, B Load cell (second detector) 18L, R Load cell (first detector) 19 Electromagnetic switching valve (switching valve) 25L, R Check valve 26A-C Rolling machine 27 Pinch roll device 31 rolling mill 32A, B furnace coiler 37 hydraulic pressure source 39L, R pressure reducing valve (pressure regulating valve) 46L pressing cylinder (first means, first elevating means) 46R pressing cylinder (second means, first means) Lifting means)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B21B 39/08 B21C 47/24 G B21C 47/00 47/34 D 47/24 B65H 23/038 Z 47/34 B21B 37 / 00 BBM // B65H 23/038 135 (72) Inventor Yasushi Yoshimura 3-1-1 Sachicho, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Kenichi Yoshimoto Sachi-cho, Hitachi-shi, Ibaraki 3-1, 1-1 in Hitachi, Ltd. Hitachi, Ltd. Hitachi Plant (72) Inventor Takehisa Atom, 3-1-1, Sachimachi, Hitachi, Ibaraki F-term in Hitachi, Ltd. Hitachi Plant F-term (reference) 3F104 AA05 CA05 CA11 4E002 AD01 BD20 CB05 CB10 4E024 BB18 EE01 FF03 4E026 AA15 DA13 GA08

Claims (15)

[Claims] 1. A pair of upper and lower pinch rolls, and first lifting means for raising and lowering at least one of an upper pinch roll and a lower pinch roll in a vertical direction. A first means connected to one end of the pinch roll in the rolled material width direction and elevating the one end, and a second means connected to the other end of the corresponding pinch roll in the rolled material width direction and elevating the other end In a pinch roll device comprising: a vertically moving amount of the first means and a vertically moving amount of the second means such that the vertically moving amount of the first means is always substantially equal to the vertically moving amount of the second means; A pinch roll device comprising a displacement amount restricting means for restricting the movement in association with each other. 2. The pinch roll device according to claim 1, wherein said first means and said second means each include a hydraulic cylinder driven by a working liquid from a hydraulic pressure source, and The restraining means includes a working liquid distribution means for distributing the working liquid from the hydraulic pressure source to the hydraulic cylinder of the first means and the hydraulic cylinder of the second means at substantially the same time. And a pinch roll device. 3. The pinch roll device according to claim 2, wherein said working liquid distribution means includes a first liquid chamber corresponding to said first means and a second liquid chamber corresponding to said second means. A rod slidably penetrating the first and second liquid chambers; and a rod fixed to the rod to slide in the first liquid chamber and to move the first liquid chamber to the hydraulic pressure. A first piston for partitioning into an area connected to the source side and an area connected to the first means side; and a second liquid chamber fixed to the rod and slidable in a second liquid chamber. A pinch roll device comprising a tuning cylinder having a second piston for partitioning a portion into a region connected to the hydraulic pressure source side and a region connected to the second means side. 4. A pinch roll apparatus according to claim 2, further comprising a pressure accumulating means connected to a pipeline from said hydraulic pressure source to said working liquid distribution means. 5. The pinch roll device according to claim 2, further comprising a switching valve capable of selectively connecting said working liquid distribution means to said hydraulic pressure source or hydraulic pressure tank. 6. The pinch roll device according to claim 2, wherein the working liquid distribution means is connected to one of a bottom side and a rod side of the hydraulic cylinder of the first and second means, A pinch roll device wherein a working liquid having a desired constant pressure is always guided to the other of the bottom side and the rod side via a pressure adjusting valve. 7. The pinch roll device according to claim 2, wherein the working liquid distribution means is connected to one of a bottom side and a rod side of the hydraulic cylinder of the first and second means, A pinch roll device, wherein a hydraulic pressure source is connected via a check valve to a conduit connecting one of the bottom side and the rod side of the hydraulic cylinder to the working liquid distribution means. 8. The pinch roll device according to claim 1, further comprising a second elevating means for vertically elevating said at least one pinch roll together with said first elevating means, wherein said second elevating means comprises: A pinch roll device comprising a pressing means for applying a desired constant pressing force to the pinch roll. 9. The pinch roll according to claim 1, further comprising first detecting means for detecting vertical pressing forces by said first means and said second means. apparatus. 10. The pinch roll device according to claim 1, wherein said first lifting means is connected to both ends of at least one of the pinch rolls connected in the rolled material width direction and substantially in a horizontal plane applied to said pinch roll. A pinch roll device comprising a second detecting means for detecting a rotational moment. 11. A pinch roll apparatus according to claim 1, wherein said pinch roll apparatus is provided along with a housing post of a rolling mill for rolling said rolled material. 12. A pinch roll device according to claim 9, which is disposed on at least one of an entrance side and an exit side of a rolling mill, wherein said first means and said second means detected by said first detecting means are provided. A meandering control method using a pinch roll apparatus, wherein a difference in vertical pressing force by means is determined, a rolling amount in the rolling mill is adjusted based on the value, and meandering of the rolled material is controlled. 13. The pinch roll device according to claim 10,
Placed on at least one of the entry side and the exit side of the rolling mill,
A meandering control method using a pinch roll device, wherein a rolling amount of a rolling material is controlled by adjusting a rolling amount of the rolling mill based on a value of a rotational moment detected by the second detecting means. 14. A hot rolling facility in which a plurality of stands of rolling mills are arranged in tandem, wherein the pinch roll device according to any one of claims 1 to 11 is connected to at least an entrance side or an exit side of a rolling mill of a final stand. Hot rolling equipment, which is installed in 15. A hot-rolling plant comprising at least one rolling mill, and a furnace coiler provided on each of an inlet side and an outlet side of the rolling mill, wherein the pinch roll according to any one of claims 1 to 11. A hot rolling facility, wherein an apparatus is provided at an inlet of the furnace coiler.