JPH09300017A - Hot rolling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the cost of equipment and maintenance/management cost of hot rolling equipment. SOLUTION: An inexpensive screw-down cylinder 29 without rod-position control function is provided for controlling screw-down pressure of an upper pinch roll 24, also an inexpensive elevating/lowering cylinder 31 without the rod-position control function is provided for elevating and lowering the screw- down cylinder 29 and screw-down control of band steel 22 is executed with an inexpensive servo valve 32 having single function of only screw-down pressure control. The cost of equipment and maintenace/management cost of the hot rolling equipment are suppressed and the manufacturing cost of the hot rolled band steel is reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hot rolling facility equipped with a pinch roll unit for supplying hot rolled steel to a coiler.

[0002]

2. Description of the Related Art FIG. 7 is a side view showing the concept of a finish rolling mill and a strip winding unit in a conventional general hot rolling facility.

As shown in the figure, the hot-rolled steel strip (steel strip) 2 finish-rolled by the finish rolling mill 1 is cooled to a required temperature by a cooling spray and a crop shear (not shown), and the tip portion of the strip is It is cut and conveyed to the pinch roll unit 3. In the pinch roll unit 3, the Silnack cylinder 4 is driven by the operation of the servo valve 6 while the rod position is detected by the Silnack sensor 5, and the upper pinch roll 8 that is driven and rotated is moved up and down through the bearing box 7 to remove the strip steel. A proper gap with the lower pinch roll 9 for the plate thickness of 2 is formed (positioning of the rod).

The laser sensor 10 detects the biting of the upper pinch roll 8 and the lower pinch roll 9 at the front end portion of the steel strip 2 by shutting off the laser from the laser emitter 11, and further,
The strip steel 2 bitten by the servo valve 6 is rolled down. The pressure reduction is detected by the differential pressure between the rod side hydraulic sensor 12 and the head side hydraulic sensor 13, the servo valve 6 is finely operated and adjusted to a predetermined pressure reduction (pressure reduction pressure control) strip steel 2
Are supplied to the down coiler 14.

In the down coiler 14, the mandrel 15 and the first unit roll 16 are engaged with the tip of the strip steel 2, and the strip steel 2 is pressed by the first unit roll 16, the second unit roll 17 and the third unit roll 18. It is wound up while being played. After the second roll, the first unit roll 16,
The second unit roll 17 and the third unit roll 18 are subjected to step avoidance control one after another, and as shown by the two-dot chain line in the figure,
The steel strip 2 is wound around the coil 19.

[0006]

In the conventional pinch roll unit 3 in the hot rolling equipment, the upper pinch roll 8 is used.
It was necessary to use an expensive Silnack cylinder 4 for raising and lowering and reducing the pressure, and to use an expensive servo valve 6 having both a position control function and a pressure control function. Therefore, the equipment cost and maintenance cost of the hot rolling equipment become expensive,
The manufacturing cost of the coil 19 of the strip steel 2 has risen.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hot rolling facility in which the facility cost and maintenance cost are kept low.

[0008]

In order to achieve the above object, the structure of the hot rolling equipment of the present invention is a hot rolling equipment provided with a pinch roll unit for supplying hot rolled steel strip to a coiler by upper and lower pinch rolls. The position detector controls the relative distance between the upper and lower pinch rolls, and the end detectors provided on the entry sides of the upper and lower pinch rolls to detect the front and rear ends of the hot-rolled steel strip. First feed means for adjusting the first feed means, second feed means for moving the first feed means in the same direction as the feed direction of the first feed means without performing position control, and detection information of the end detector. Is input, and when it is detected that the hot-rolled steel strip is not threaded, the first
When the feeding by the feeding means is set to the neutral state, the upper and lower pinch rolls are separated by the second feeding means, and the hot-rolled steel sheet is detected to be passing through the second feeding means. Control means for holding the upper and lower pinch rolls in a state in which they are closest to each other, and for adjusting the relative distance between the upper and lower pinch rolls by pressure control by the first feeding means. .

The first feeding means is provided on the upper pinch roll so as to be able to move up and down, and includes a pressure reducing cylinder and a servo valve for pressure reduction pressure control, and a rod side provided between the pressure reducing cylinder and the servo valve. The second feed means is composed of an oil pressure sensor and a head side oil pressure sensor, and the second feeding means is composed of an elevating cylinder and an electromagnetic valve which are provided in the pressure reducing cylinder and move up and down the pressure reducing cylinder.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION During the non-threading of hot-rolled steel, the rod of the reduction cylinder is lowered to the lower limit by the servo valve to make the rod neutral, and the rod of the lifting cylinder is lowered to the lower limit by the solenoid valve. The upper pinch roll is brought into contact with the lower pinch roll to set the approximate position of the rod of the pressing cylinder, and the rod of the elevating cylinder is raised to the upper limit to prepare for hot-rolled steel biting.

The hot-rolled steel strip subjected to finish rolling is conveyed to a pinch roll unit, and an end detector bites the hot-rolled strip steel (the tip of the hot-rolled strip steel is placed between the upper pinch roll and the lower pinch roll). (Reach) is detected, the rod of the elevating cylinder is lowered and held to the lower limit, and the upper pinch roll is lowered by the lowering of the rod of the reduction cylinder to reduce the tip of the hot-rolled steel strip. While the hot-rolled steel strip is threaded, the servo valve reduces the pressure of the cylinder while detecting the pressure of the cylinder by the pressure difference between the rod-side hydraulic pressure sensor and the head-side hydraulic pressure sensor while holding the rod of the lifting cylinder at the lower limit. Finely operate the cylinder to adjust to the required reduction pressure.

When the end detector detects the passage of the rear end of the hot-rolled steel strip, the rod of the lifting cylinder is raised to the upper limit to neutralize the rod of the rolling-down cylinder to slip the hot-rolled steel strip to the next position. Prepare for the biting of the tip of the hot-rolled steel.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing the concept of a finish rolling mill and a strip steel winding section in a hot rolling facility according to an embodiment of the present invention, and FIGS. 2 to 6 show the pinch roll unit in FIG. The side section showing the operation of is shown.

The hot-rolled steel strip (steel strip) 22 finish-rolled by the finish rolling mill 21 is cooled to a required temperature by a cooling spray and a crop shear (not shown), and the crop at the tip is cut off, and the pinch roll unit is cut. 23
Transported to The pinch roll unit 23 includes an upper pinch roll 24 and a lower pinch roll 25, and the strip steel 22 is conveyed to the down coiler 26 by the upper pinch roll 24 and the lower pinch roll 25.

The upper pinch roll 24 is a bearing box 27 that moves up and down.
The lower pinch roll 25 is rotatably supported by a fixed bearing block 28.
The bearing box 27 is moved up and down by the reduction cylinder 29, and the upper pinch roll 24 is driven up and down via the bearing box 27 by driving the reduction cylinder 29. The reduction cylinder 29 is attached to the frame 30, and the frame 30 is connected to the lifting cylinder 3
1, the bearing box 27 is moved up and down in the same direction.

A servo valve 32 dedicated to pressure control is attached to the pressure reduction cylinder 29, and the pressure reduction cylinder 29 includes the servo valve 32.
By this, only pressure control is performed. A head side oil pressure sensor 33 is provided between the servo valve 32 and the head side of the pressure reduction cylinder 29, and a rod side oil pressure sensor 34 is provided between the servo valve 32 and the rod side of the pressure reduction cylinder 29. A solenoid valve 35 dedicated to raising and lowering is attached to the raising and lowering cylinder 31, and the raising and lowering cylinder 31 includes the solenoid valve 3.
By means of 5, the ascending / descending control without the position control is performed.

Upper pinch roll 24 and lower pinch roll 25
A laser emitter 36 and a laser sensor 37 as an edge detector are provided on the entrance side of the strip, and the laser is cut off from the laser emitter 36 to the upper pinch roll 24 and the lower pinch roll 25 at the tip of the strip 22. The biting of the steel strip 2 is detected by detecting the biting of the strip and receiving the laser beam from the laser emitter 36.
2 upper pinch roll 24 and lower pinch roll 25
It is designed to detect slipping from the bottom. The detection information of the head side oil pressure sensor 33, the rod side oil pressure sensor 34, and the laser sensor 37 is input to the control device 38, and the control device 38 receives the servo valve 32 and the solenoid valve 35 based on the input information.
The operation command is output to.

Upper pinch roll 24 and lower pinch roll 25
The strip steel 22 that has been rolled down by is supplied to the down coiler 26 and wound around the coil 40. The down coiler 26 includes a mandrel 41, a first unit roll 42, a second unit roll 43, and a third unit roll 44. The tip end portion of the strip steel 22 is bitten by the mandrel 41, and the strip steel 2
2 is a first unit roll 42, a second unit roll 43
Also, it is pressed by the third unit roll 44 and wound around the coil 40.

The operation of the hot rolling equipment having the above structure will be described.

First, the rod of the pressure reducing cylinder 29 is lowered to the lower limit by the servo valve 32, and then the rod is made neutral. As shown in FIG. 2, the rod of the lifting cylinder 31 is lowered to the lower limit by the solenoid valve 35. The upper pinch roll 24 is brought into contact with the lower pinch roll 25 to set the approximate position of the rod of the pressing cylinder 29. Next, as shown in FIG. 3, the rod of the elevating cylinder 31 is raised to the upper limit to prepare for the biting of the strip steel 22.

The strip steel 22 finish-rolled by the finish rolling mill 21 is cooled to a required temperature by a cooling spray and a crop shear (not shown) and the tip of the strip steel is cut and cut, and is conveyed to the pinch roll unit 23. FIG.
As shown in FIG. 5, when the laser from the laser light emitting device 36 is cut off by the tip end of the strip steel 22, the laser sensor 37 detects the interruption and the strip steel 22 is caught (the tip end of the strip steel 22 is the upper pinch roll 24. Between the lower pinch roll 25 and the lower pinch roll 25) is detected. When the biting of the strip steel 22 is detected, the rod of the lifting cylinder 31 is lowered and held to the lower limit, and the lower pinch roll 24 is lowered by the lowering of the rod of the reduction cylinder 29 to reduce the tip end portion of the strip steel 22 and the down coiler. 26 to start winding.

As shown in FIG. 5, with the rod of the elevating cylinder 31 held at the lower limit during the passage of the strip steel 22, the pressure reducing cylinder 29 is driven by the differential pressure between the rod side hydraulic sensor 34 and the head side hydraulic sensor 33. While detecting the reduction pressure of
The reduction valve 29 is slightly operated by the servo valve 32 to adjust it to a required reduction pressure. As shown in FIG. 6, the laser sensor 37 receives the laser beam from the laser emitter 36,
When the passage of the rear end portion of the strip steel 22 whose rear end crop has been cut by a crop shear (not shown) is detected, the rod of the lifting cylinder 31 is raised to the upper limit, and the reduction cylinder 29 is pressed.
Set the rod of to neutral (return to the state of FIG. 3). In this state, the rear end of the strip steel 22 is slipped out to complete the winding of the coil 40 by the down coiler 26, and the next tip of the strip steel 22 is prepared for biting.

In the hot rolling equipment described above, an inexpensive reduction cylinder 29 having no rod position control function is provided for the reduction pressure control of the upper pinch roll 24, and a rod position control function is not provided for raising and lowering the reduction cylinder 29. Since the inexpensive lifting cylinder 31 is provided, the rolling control of the strip 22 can be performed by the single-function inexpensive servo valve 32 only for the rolling pressure control.

[0024]

The hot rolling equipment of the present invention adjusts the rolling pressure between the upper and lower pinch rolls without performing position control.
Since the feed means is provided and the second feed means for moving the first feed means up and down without performing the position control is provided, the rolling control of the hot-rolled steel strip can be performed by a simple and inexpensive component only for the rolling pressure control. As a result, the facility cost and maintenance cost of the hot rolling facility can be kept low, and the manufacturing cost of the hot rolled steel coil can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing the concept of a finish rolling mill and a strip steel winding unit in a hot rolling facility according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing the operation of the pinch roll unit in FIG.

FIG. 3 is a side sectional view showing the operation of the pinch roll unit in FIG.

FIG. 4 is a side sectional view showing the operation of the pinch roll unit in FIG.

5 is a side sectional view showing the operation of the pinch roll unit in FIG.

6 is a side sectional view showing the operation of the pinch roll unit in FIG.

FIG. 7 is a side view showing the concept of a finish rolling mill and a strip winding unit in a conventional general hot rolling facility.

[Explanation of symbols]

 21 Finishing Rolling Machine 22 Hot Rolled Steel Strip (Steel) 23 Pinch Roll Unit 24 Upper Pinch Roll 25 Lower Pinch Roll 26 Down Coiler 27 Bearing Box 28 Bearing Block 29 Bearing Reduction Cylinder 30 Frame 31 Lifting Cylinder 32 Servo Valve 33 Head Side Oil Pressure Sensor 34 Rod side oil pressure sensor 35 Solenoid valve 36 Laser light emitter 37 Laser sensor 38 Control device 39 Down coiler 40 Coil

Claims (2)

[Claims] 1. A hot rolling facility comprising pinch roll units for supplying hot rolled steel strip to a coiler by means of upper and lower pinch rolls, the tip of said hot strip steel being provided on the entry side of the upper and lower pinch rolls. Section and rear end section, an end detector, first feeding means for adjusting the relative distance between the upper and lower pinch rolls without performing position control, and the first feeding means for the first feeding means. The second feed means for moving in the same direction as the feeding direction of the sheet without performing position control, and the detection information of the end detector are input, and it is detected that the hot-rolled steel strip is not threaded. At this time, the feed by the first feeding means is set to a neutral state, and the upper and lower pinch rolls are separated most by the second feeding means, and it is detected that the hot-rolled steel strip is being threaded. In the second
Control means for holding the upper and lower pinch rolls in a state of being closest to each other by the feeding means and adjusting the relative distance between the upper and lower pinch rolls by the pressure control by the first feeding means. Hot rolling equipment. 2. The reduction mechanism according to claim 1, wherein the first feeding means is provided on the upper pinch roll so as to be able to move up and down, and between a pressure reduction cylinder and a servo valve for pressure reduction pressure control, and between the pressure reduction cylinder and the servo valve. And a head side oil pressure sensor, wherein the second feeding means includes an elevating cylinder for raising and lowering the pressure reducing cylinder and an electromagnetic valve provided in the pressure reducing cylinder. Rolling equipment.