JPH03285708A - Rolling equipment - Google Patents

Abstract

PURPOSE:To make work rolls so as to be movable smoothly and vertically by releasing pressing force with pressing cylinders when the drawing down position of upper and lower work rolls is varied more than the allowable displacement. CONSTITUTION:The drawing down position of the work rolls 2, 3 is detected with a position detector 18 and return command signal 20 for releasing the pressing force with the pressing cylinders 7, 8 is outputted from a controller 21 to a switching valve 17 when it is discriminated based on that detection signal 19 that the drawing down position of the work rolls 2, 3 is displaced more than the allowable displacement from the drawing down position at a certain point of time. The switching valve 17 is switched, the pressing cylinders 7, 8 with which bearing boxes 4, 5 are pressed against the housing 1 till then are contracted and the pressing force is released. In this way, the work rolls 2, 3 can be smoothly and vertically moved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to rolling equipment.

[Prior Art] Generally, in rolling equipment such as a horizontal mill, as shown in FIG. There is a slight gap between the work rolls 2,
3 cannot maintain a surface angle with respect to the material 6, and camber occurs in the material 6.

For this reason, conventionally, as shown in FIG.
On the upstream side of the rolling line L, there was provided a pressing cylinder 7.8 for pressing the end face of the axle box 45 on the downstream side of the rolling line L against the housing 1 to reduce looseness.

In the figure, 9 and 10 are liners fixed to the upstream and downstream end surfaces of the axle boxes 4 and 5; L1. , 12 is "1 lower backup roll,
1.3.14 is a shaft box that pivotally supports the backing roll 1.1.12;
Reference numeral 15 represents a reduction cylinder for controlling the thickness of the material 6.

[Problem to be solved by the invention] However, in the above-mentioned rolling equipment, since the axle boxes 4 and 5 are constantly pressed against the nozzle by the pressing cylinders 7 and 8, when controlling the plate thickness, etc. The second crawl 2,
When 3 is moved up and down, the second downward movement is the pressing cylinder 7.8
There is no problem as long as it is small enough to be absorbed by the elastic deformation of
Or press cylinder 7.8 screw! - The surface of the liner 9 and 10 is locally worn out, and the piston rod gets caught in the worn part, making it impossible to move the work rolls 2 and 3 up and down smoothly. There was a risk.

In view of these circumstances, the present invention aims to provide a rolling equipment that can prevent wear of the contact surface of the axle box with the pressing cylinder due to the movement of the work rolls, and can perform smooth operation.

[Means for Solving the Problems] The present invention provides a pressing cylinder that presses the rolling line downstream end face of an axle box that pivotally supports a work roll against a housing, and a mechanism that switches the supply and discharge of working fluid to the pressing cylinder. a switching valve, a position detector for detecting the rolled position of the work roll, and a position detector for detecting the rolled position of the work roll, and based on the detection signal from the position detector, the rolled position of the work roll is determined to be within the allowable displacement amount from the rolled position at a certain point in time. - a control device that outputs a return command signal to the switching valve to release the pressing force from the pressing cylinder when the pressing force changes; In a rolling equipment in which a work roll is offset by a required amount to the downstream side of a rolling line, a pressing cylinder that presses an end face of an axle box that pivotally supports the work roll on the downstream side of the rolling line against a housing, and supply and discharge of working fluid to the pressing cylinder. a pressure regulating valve provided in the middle of a working fluid flow path connecting the switching valve and the pressing cylinder to adjust the pressure of the working fluid supplied to the pressing cylinder, and the work roll. a load detector for detecting the rolling force caused by the pressing cylinder; and a load detector for detecting the rolling force by the pressing cylinder according to the rolling force when the rolling force by the work roll is less than a set value based on the detection signal from the load detector. A reduction command signal to reduce the pressure is output to the pressure regulating valve, and when the rolling force by the work roll exceeds a set value, a return command signal to release the pressing force by the pressing cylinder is output to the switching valve. The present invention relates to a rolling equipment characterized by being equipped with a control device.

[Function] Therefore, in a rolling equipment equipped with a position detector, the position detector detects the rolling position of the work roll,
When it is determined based on the detection signal from the position detector that the rolled position of the work roll has changed by more than a permissible displacement amount from the rolled position at a certain point in time, a return command signal is issued to release the pressing force from the pressing cylinder. An output is sent from the control device to the switching valve, and the switching valve switches, causing the pressing cylinder that had been pressing the axle box against the housing to contract, and the pressing force is released.

This allows smooth downward movement of the work roll.

In addition, in rolling equipment equipped with a load detector, the rolling force by the work rolls is detected by the load detector, and the rolling force by the work rolls is determined to be less than a set value based on the detection signal from the load detector. When it is determined, a reduction command signal for reducing the pressing force by the pressing cylinder according to the rolling force is output from the control device to the pressure regulating valve, and the pressing force of the pressing cylinder pressing the axle box against the housing is reduced. In addition, when it is determined that the rolling force by the work roll exceeds the set value, a return command signal to release the pressing force by the pressing cylinder is output from the control device to the switching valve, and the switching valve is switched. The pressing cylinder that had been pressing the axle box against the housing contracts and the pressing force is released. This makes it possible to eliminate looseness between the axle box and the housing by maximizing the horizontal force that acts on the work roll during rolling due to the offset between the holding roll and the work roll, without having to operate the pressing cylinder at full capacity all the time. becomes.

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

FIG. 1 shows one embodiment of the present invention, and the parts in the figure with the same reference numerals as in FIG. 4 represent the same parts.

As shown in FIG. 1, a switching valve 17 is provided in the working fluid passage 16 that communicates with the head side chamber and the rod side chamber of the pressing cylinder 7.8, respectively. and a tank (not shown) and the rod side chamber, while communicating the pressure source and the rod side chamber, and communicating the tank and the head side chamber, and in the reduction cylinder 15,
A position detector 18 is provided to detect the amount of expansion and contraction of the reduction cylinder 15, that is, the reduction position of the work rolls 2 and 3, and further, based on the detection signal 19 from the position detector 18, the reduction of the work roll 2.3 is detected. When the position changes from the pressed position at a certain point by more than the allowable displacement amount, the pressing cylinder 7.
A control device 21 is provided for outputting a return command signal 20 to the switching valve 17 to release the pressing force caused by the switching valve 17.

The control device 21 receives a detection signal from the position detector 18]
9, and a memory 23 that stores and outputs the rolling position y of the work roll 2.3, which is the base at a certain point during rolling, by the opening operation of the automatic release start relay 22, and the allowable displacement amount from the rolling position y. a setter 24 for setting 2, and a comparator that performs a comparison calculation between the ever-changing actual rolling position X of the work roll 2.3 obtained from the detection signal 19, the rolling position y, and the allowable displacement J7tz. 25, and a comparison result 27 output from the comparator 25, when the lowered position It is composed of a return command device 26.

Next, the operation of the above embodiment will be explained.

When rolling the material 6, the switching valve 17 is switched to a position that communicates the pressure source with the head side chamber of the pressing cylinder tuff 8, and the pressing cylinder 7.8 connects the axle box 4,
5 is pressed against the housing 1, and in this state,
When the reduction cylinder 15 expands and contracts to control the plate thickness, the position detector 18 detects the reduction position X of the work rolls 2 and 3.

The detection signal J9 from the position detector 18 is transmitted to the control device 2.
1 comparator 25 is manually inputted as the actual rolling position X of the work roll 2.3, and when the automatic release start relay 22 is closed, y=x, and the comparison result 27 becomes x.
-(y+z)×O, so the return command signal 20 is not output from the return command device 26.

If the automatic release start relay 22 is opened at a certain point during rolling,
The rolling position y of the work rolls 2 and 3, which is the reference, is stored in memory 2.
3 and outputted to the comparator 25 as a constant value as shown in FIG.

The actual rolling position X of the work rolls 2 and 3 changes from moment to moment, and has changed by an allowable displacement amount of 2 or more from the rolling position y (
That is, when X≧y1z) is calculated in the comparator 25, based on the comparison result 27 from the comparator 25, the return command signal 20 for releasing the pressing force of the pressing cylinder 7.8 is a return command. Vessel 2
6 to the switching valve 17 as an output of the control device 21, the switching valve 17 switches, and the pressing cylinders 7.8 that had been pressing the axle boxes 4, 5 against the housing 1 contract and the pressing force is released. .

Thereafter, when the pressure down position X returns to a position within the allowable displacement amount Z, the return command signal 20 output from the control device 21 is released, the switching valve 17 returns to its original position, and the pressing cylinder The clearance between the axle boxes 4, 5 and the housing 1 according to 7.8 is restarted.

In addition, after the pressing force by the pressing cylinder 7.8 is released, if the lowered position After closing once and canceling the output of the command signal 20 and restarting the looseness reduction by the pressing cylinder 7.8,
If you open the automatic release start relay 22 again, the memory 2
3, the rolled down position y is updated, and the actual rolled down position 1 continues to be monitored based on the updated rolled down position y.

In this way, the liners 9, 10 of the axle boxes 4, 5 are not twisted by the piston rod of the pressing cylinder 7.8, and local wear on the surfaces of the liners 9, 10 is prevented.
Smooth downward movement of the work rolls 2 and 3 is possible.

Further, FIG. 3 shows another embodiment of the present invention,
In the figure, parts with the same reference numerals as in Figure 1 represent the same parts, and the work rolls 2 and 3 are offset by AS toward the downstream side of the rolling line L with respect to the backing rolls 1 ], , + 2. In the equipment, a pressure regulating valve 28 for adjusting the pressure of the working fluid supplied to the head side chamber is provided in the middle of the working fluid passage 16 connecting the switching valve 17 and the head side chamber of the pressing cylinder 7.8, and the housing A load detector 29 such as a load cell is provided between the backing roll 11 and the axle box 13 to detect the rolling force caused by the work rolls 2 and 3, and based on the detection signal 30 from the load detector 29, When the rolling force by the work roll 2.3 is less than a set value, a reduction command signal 31 is output to the pressure regulating valve 2B to reduce the pressing force by the cylinder 7.8 with the pusher 2 in accordance with the rolling force. and a control device 33 that outputs a return command signal 32 to the switching valve 17 to release the pressing force from the pressing cylinder 7.8 when the rolling force from the work rolls 2 and 3 exceeds a set value.
will be established.

When the work rolls 2 and 3 are offset by AS toward the downstream side of the rolling line L with respect to the backing rolls 11 and 12 as in another embodiment shown in FIG.
, 3 is originally a pressing cylinder 7.
Although the axle boxes 4 and 5 are pressed against the housing 1 even without the material 6, since there is no rolling force and no horizontal force due to offset is generated before the material 6 is bitten, pressing by the pressing cylinder 7.8 is necessary. Further, when the rolling force is small even after the material 6 is bitten, the horizontal component force is small, and pressing by the pressing cylinder 7.8 is still necessary.

When the rolling force by the work roll 2.3 is detected by the load detector 29 and the detection signal 30 from the load detector 29 is input to the control device 33, the rolling force by the work roll 2.3 is input to the setting device 35. If the rolling force is less than a preset value, the pressing cylinder 7
．． Decrease command signal 31 for reducing the pressing force by 8
is output from the reduction command device 34 of the control device 33 to the pressure regulating valve 28, and the pressing force of the pressing cylinder 7.8 pressing the axle boxes 4, 5 against the housing 1 is reduced.

Further, when the rolling force by the work roll 2.3 exceeds the set value, a return command signal 32 for canceling the pressing force by the pressing cylinder 7.8 is sent to the return command device based on the comparison result 38 from the comparator 36. 37 to the switching valve 17 as an output of the control device 33, the switching valve 17 switches, and the pressing cylinders 7.8, which had been pressing the axle boxes 4, 5 against the housing 1 with the desired pressing force, contract and press. power is released.

Thereafter, when the rolling force falls below the set value again, the return command signal 20 output from the control device 33 is released, the switching valve 17 returns to its original position, and the pressing cylinder 7. The pressing force eliminates looseness between the axle box 4.5 and the housing 1.

In this way, the pressing cylinders 7 and 8 are not operated at full capacity all the time, and
Due to the offset between the backing roll 11.12 and the work rolls 2 and 3, it is possible to make maximum use of the horizontal component force that acts on the work roll 2.3 during rolling to reduce looseness between the axle box 4.5 and the housing 1. becomes.

It should be noted that the rolling equipment of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the rolling equipment of the present invention, wear of the contact surface of the axle box with the pressing cylinder due to movement of the work roll can be prevented, and smooth operation can be achieved. The advantage is that the distance between the axle box and the housing can be tightened by making maximum use of the horizontal component force that acts on the work roll during rolling by offsetting the holding roll and work roll without operating the cylinder at full capacity all the time. It can have a great effect.

[Brief explanation of the drawing]

Fig. 1 is a side system diagram of one embodiment of the present invention, Fig. 2 is a diagram showing the relationship between the rolling position of the work roll and the allowable value that changes with the passage of time, and Fig. 3 is a diagram showing the relationship between the rolled down position of the work roll and the allowable value that changes with the passage of time. FIG. 4 is a side view of the conventional example, and FIG. 5 is a plan cross-sectional view showing a state in which camber occurs in the material due to the gap between the axle box and the housing. '' is a housing, 2 and 3 are work rolls, 4 and 5 are axle boxes, 7 and 8 are pressing cylinders, II, +2 are control rolls, +5 is a compression cylinder, 16 is a working fluid flow path, 17 is a switching valve, 1
8 is a position detector, 19 is a detection signal, 20 is a return command signal, 21 is a control device, 28 is a pressure regulating valve, 29 is a load detector, 30 is a detection signal, 31 is a reduction command signal, 32 is a return command signal , 33 is a control device, L is a rolling line, X+Y is a rolling position, 2 is an allowable displacement amount, and AS is an offset amount. 6 Japanese Unexamined Patent Publication No. 3 285708 (7)

Claims (1)

[Scope of Claims] 1) A pressing cylinder that presses the rolling line downstream end surface of an axle box that pivotally supports a work roll against a housing, and a switching valve that switches the supply and discharge of working fluid to the pressing cylinder; A position detector for detecting the rolled position of the work roll, and pressing by the pressing cylinder when the rolled position of the work roll changes by more than an allowable displacement amount from the rolled position at a certain point in time based on a detection signal from the position detector. A rolling equipment comprising: a control device that outputs a return command signal to the switching valve to release the force. 2) In rolling equipment in which the work roll is offset by a required amount to the downstream side of the rolling line with respect to the backup roll, a pressing cylinder that presses the downstream end surface of the rolling line of the shaft box that pivotally supports the work roll against the housing, and A switching valve for switching the supply and discharge of working fluid, and a pressure adjustment provided in the middle of a working fluid flow path connecting the switching valve and the pressing cylinder to adjust the pressure of the working fluid supplied to the pressing cylinder. a valve; a load detector for detecting the rolling force by the work roll; and a load detector for detecting the rolling force by the pressing cylinder according to the rolling force when the rolling force by the work roll is less than a set value based on a detection signal from the load detector. A reduction command signal to reduce the pressing force is output to the pressure regulating valve, and when the rolling force by the work roll exceeds a set value, a return command signal is output to the switching valve to release the pressing force by the pressing cylinder. A rolling equipment characterized by comprising: a control device that outputs an output to the rolling equipment;