JPH0852514A - Pinch roll device - Google Patents

Abstract

PURPOSE:To safely guide a strip to a coiler and to prevent the penetration and meandering of the strip by executing position control and pressing-force control of an upper pinch roll in a pinch roll device. CONSTITUTION:Hydraulic cylinders 18 are respectively provided in the right and left bearing parts of the upper pinch roll 8 and respectively connected to servo valves 20 through pipings 19. The opening of the servo valve 20 is controlled by a command signal 21 and the charging/discharging amount of hydraulic oil to the cylinder 18 is adjusted. The command signal 21 is generated with controller 22 and is a signal for controlling the servo valve 20 so as to make the position and pressing force of the upper pinch roll 8 match with set values. A pressing force detector 40 is composed of pressure detectors 26, 27 for detecting pressures on the head side and rod side of the hydraulic cylinder 18 and the pressing force of the pinch rolls 6 is calculated from the signals from the pressure detectors 26, 27 with a computing element 28. And, the position of the piston 30 of the hydraulic cylinder 18 is detected with position detector 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roll device for hot rolling equipment.

[0002]

2. Description of the Related Art FIG. 5 is a side view of a conventional hot rolling facility. In the hot rolling equipment as shown in FIG. 5, after the strip 2 rolled by the rolling mill 1 is cooled by the cooling device 4,
The run-out table 3 (roller table) conveys the material to the downstream side 5, the direction of which is changed obliquely downward by the pinch roll device 6, and the material is wound up by the winding machine 7. As shown in FIG. 5, the pinch roll device 6 has a difference in diameter between the upper roll 8 and the lower roll 9, and the axial centers of the upper and lower rolls 8 and 9 are slightly offset in the transport direction,
The strip 2 is adapted to be guided downward.

FIG. 6 is a cross-sectional side view of the pinch roll device 6 of FIG. 5, and FIG. 7 is a plan view schematically showing the drive portion of the stopper device 13 of FIG. As shown in FIG. 6, the upper roll 8 has a stopper device 13 fixed to the frame 15.
And an initial gap C (gap) with the lower roll 9 is set. As shown in FIG.
The stopper device 13 is driven by a motor 10, a gear system 11 and a worm jack 12, and the four stopper devices 13 are provided between the upper roll 8 and the lower roll 9 to remove the strip 2
The initial gap C is set smaller than the thickness of the upper roll 8 and the upper roll 8 is slightly lifted when the strip 2 is clamped, and the upper roll 8 is pressed downward by the air cylinder 14.

[0004]

However, in such a conventional pinch roll device, in order to increase the pressing force, the air pressure to be supplied is limited, so that the cylinder diameter must be increased. As shown in Fig. 4, a single motor adjusts the gap in the width direction and the advancing direction for a total of four points, so a complicated stopper device that includes a screw, a worm jack, and a clutch (not shown) is required. There was a problem such as being. In view of the above situation, the present invention has a simple structure,
The object of the present invention is to provide a pinch roll device that can give a strong pressing force.

[0005]

According to the present invention, in a pinch roll device which sandwiches a strip between upper and lower pinch rolls and guides the strip obliquely downward, a hydraulic pressure for individually supporting both axial end portions of the upper pinch rolls. A cylinder, a servo valve for adjusting the inflow and outflow of hydraulic oil in the hydraulic cylinder, a position detector for detecting the piston position of the hydraulic cylinder, a pressing force detector for detecting the downward pressing force of the hydraulic cylinder, and a servo valve. And a control device for controlling the position of the upper pinch roll, thereby performing the position control and the pressing force control of the upper pinch roll.

According to a preferred embodiment of the present invention, the pressing force detector is a pressure detector for detecting the pressure on the head side and the rod side of the hydraulic cylinder. Further, it is preferable that the pressing force detector is a load cell provided in a bearing portion of the lower pinch roll. Further, the control device is configured to set the gap between the upper and lower pinch rolls by position control before entering the strip, then detect the entry of the strip and switch to the pressing force control.

[0007]

As described above, in the pinch roll device of the present invention, the hydraulic cylinders are provided on the left and right of the upper pinch roll, the amount of working fluid to the hydraulic cylinder is adjusted by the servo valve, and the piston position of the cylinder is detected. A position detector and a pressure detector for detecting the pressure of the cylinder are respectively provided so that the displacement and pressing force of the upper pinch roll can be controlled. As a result, the pinch roll device of the present invention uses a high-pressure hydraulic pressure to reduce the cylinder diameter and to control the displacement of the upper pinch roll by position control to reduce the gap between the upper and lower pinch rolls. Since it can be set, a conventional stopper device for setting a complicated gap is not required.

According to a preferred embodiment of the present invention,
The strip rolled by the rolling mill is cooled by a cooling device, then transported downstream by a run-out table and enters a pinch roll. The upper roll of the pinch roll is held by a hydraulic cylinder, and the amount of hydraulic oil flowing into and out of the cylinder is adjusted by a servo valve. The gap between the upper and lower rolls before the strip bites is set by the position control of the upper roll, and after the strip jumps in, the position control is switched to the constant force control, and the pressing force is applied to the strip. In this way, the strip can be guided to the winder.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In each drawing, common parts are denoted by the same reference numerals and used, and duplicate description is omitted.
FIG. 1 is an overall configuration diagram showing a first embodiment of a pinch roll device according to the present invention. In this figure, the pinch roll device of the present invention is a device for sandwiching the strip 2 between the upper and lower pinch rolls 8 and 9 and guiding the strip 2 obliquely downward, and individually supporting both axial end portions of the upper pinch roll 8. Hydraulic cylinder 18, a servo valve 20 for adjusting the amount of hydraulic oil flowing in and out of hydraulic cylinder 18, a position detector 29 for detecting the position of piston 30 of hydraulic cylinder 18, and a downward pressing force of hydraulic cylinder 18. Push force detector 40
And a control device 22 for controlling the servo valve 20. In the present invention, the hydraulic oil is hydraulic oil for hydraulic cylinders, and liquids other than oil such as water-emulsion may be used. Therefore, the hydraulic cylinder 18 may also be a hydraulic cylinder made of a liquid other than oil.

In FIG. 1, an upper pinch roll 8 and a lower pinch roll 9 are attached to an upper chock 16 (bearing portion) and a lower chock 17 (bearing portion) provided in a housing (not shown). There is. The strip 2 is sandwiched between the upper and lower pinch rolls 8 and 9, the direction of which is changed obliquely downwardly, is guided to the winder 7, and is wound up.

The left and right bearings of the upper pinch roll 8 are
Each hydraulic cylinder 18 is arranged and connected to a servo valve 20 via a pipe 19. The opening of the servo valve 20 is controlled by a command signal 21, and the amount of hydraulic oil flowing into and out of the cylinder 18 is adjusted. The command signal 21 is generated by the control device 22 (pinch roll controller), and the servo valve 2 is controlled so that the position and pressing force of the upper pinch roll 8 match the set value.
This signal controls 0. The pinch roll controller 22 is
The servo valve 20 receives the setting signal 24 from the setter 23.
A command signal to be generated is generated, but the gap of the pinch roll is adjusted or the pressing force is switched by receiving the sequence signal 25 from the host controller or the process computer (not shown) as the strip 2 advances. Work.

In the first embodiment of FIG. 1, the pressing force detector 40 is pressure detectors 26 and 27 for detecting the pressure on the head side and the rod side of the hydraulic cylinder 18, and the pressure detector 26 is calculated by the calculator 28. , 27, the pressing force F of the pinch roll 6 is calculated. Further, the position detector 29 is adapted to detect the position of the piston 30 of the hydraulic cylinder 18.

FIG. 2 is an overall configuration diagram showing a second embodiment of the pinch roll device according to the present invention. In this figure,
The pressing force detector 40 includes the bearing portion 17 of the lower pinch roll 9.
The load cell 32 provided in the. That is, instead of the pressure detectors 26 and 27 of FIG. 1, the bearing portion 17 of the lower pinch roll 9 is provided with a load cell 32 that directly detects the pressing force of the pinch roll device 6. Other configurations are shown in FIG.
Is the same as.

With the above-described structure, similarly to the conventional apparatus of FIG. 5, the strip 2 rolled by the rolling mill 1 is conveyed to the downstream side 5 by the run-out table 3, is cooled by the cooling device 4 on the way, and is then pinched. The direction is changed obliquely downward by the roll device 6 and is wound by the winder 7.

FIG. 3 is a diagram showing a change in the pressing force F, and shows a change timing of the control mode of the pinch roll device 6 at the time of winding and a change in the pressing force F of the hydraulic cylinder 18. In FIG. 3, the horizontal axis represents time and the vertical axis represents the pressing force F, which shows the control state before and after the strip 2 jumps into the pinch roll device 6. The position of the upper pinch roll 8 is controlled in advance by the pinch roll position setting signal 24 of the setting device 23 shown in FIGS. 1 and 2 before the strip 2 enters the pinch roll device 6. A setting signal 24 is given from the setting device 23 to the pinch roll controller 22, a command signal 21 is sent from the pinch roll controller 22 to the servo valve 20, and the servo valve 20 changes the hydraulic pressure according to the value of the command signal 21. The amount of oil flowing into and out of the cylinder 18 is adjusted via the pipe 19. The position of the piston 30 in the cylinder is detected by the position detector 29 and sent to the pinch roll controller 22. The pinch roll controller 22 compares the previous pinch roll position setting signal 24 with the actual displacement detected by the position detector 29, and gives a command signal 21 to the servo valve 20 until the deviation disappears. The amount of oil flowing in and out of the hydraulic cylinder 18 is adjusted. When they match, the command signal 21 to the servo valve becomes zero, and the inflow / outflow of oil to / from the hydraulic cylinder 18 is stopped. As a result, the position of the upper pinch roll 8 becomes the set value. At that time, an upward force F1 that supports the own weight of the upper pinch roll 8 is generated in the hydraulic cylinder 18. In such a state, the pinch roll device 6 is waiting for the strip 2 to enter.

When the strip 2 plunges into the pinch roll device 6 at time T1, it is, for example, pressure detector 2
The setting device 23 sends a switching signal from the position control to the pressing force control and a setting signal 24 of the setting value Fp of the pressing force to the controller 22 by detecting the change of the outputs of 6 and 27. As a result, immediately after the strip 2 passes through the pinch roll device 6, a setting signal 24 for the pinch roll pressing force Fp is given to the pinch roll controller 22 from the setting device 23, and a command signal 21 from the pinch roll controller 22. Is sent to the servo valve 20, and the servo valve 20 adjusts the inflow / outflow amount of oil to / from the hydraulic cylinder 1 according to the value of the command signal 21. In the first embodiment shown in FIG. 1, the pressure in the cylinder is detected by the pressure detectors 26 and 27 provided on the head side and the rod side of the cylinder, respectively, and sent to the calculator 28. In the calculator 28, the pressing force Fpr of the upper pinch roll is Fpr = Ph · Ah−Pr ·
It is calculated by Ar (formula), and the signal 31 is sent to the pinch roll controller 22. In the pinch roll controller 22,
Pinch roll pressing force setting value Fp and actual pressing force F
pr is compared, and the command signal 21 to the servo valve 20 is given until the difference E = Fp-Fpr disappears, and the inflow and outflow amount of oil to the hydraulic cylinder 18 is adjusted. When they match, the command signal 21 to the servo valve becomes zero, and the inflow and outflow of oil to the hydraulic cylinder 18 is stopped. As a result, the pressing force Fpr of the upper pinch roll 8 becomes the set value Fp. In the equation, Ph and Pr represent pressures on the head side and rod side of the hydraulic cylinder, and Ah and Ar represent cylinder cross-sectional areas on the head side and rod side of the hydraulic cylinder.

Further, in the second embodiment of FIG. 2, the pressing force of the pinch roll device is not obtained by the calculation based on the signal of the pressure detector as in the above equation, but the Fpr is directly detected by the load cell 32. To be done. Other operations are the same as those in the first embodiment shown in FIG. It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0018]

As described above, according to the pinch roll device of the present invention, the stable pinch force Fpr can be applied to the strip 2 by control, so that the strip 2 can be stably guided to the winder 7. Before the strip 2 enters, the gap between the upper pinch roll 8 and the lower pinch roll 9 can be set according to the thickness of the strip 2 by position control, so that there is no mechanical gap setting device such as a stopper device. An accurate upper and lower pinch roll interval can be obtained, and it is possible to prevent the strip 2 from penetrating (an accident in which the direction of the strip advances straight without changing its direction, and the rolling stops). Further, in the pinch roll device of the present invention, since the left and right are individually controlled, the pressing force of the upper pinch roll is set to the left and right independently even when there is a left-right difference in strip plate thickness as shown in FIG. As a result, the upper pinch roll 8 is inclined according to the plate thickness, so that strong reduction of only one side of the strip 2 can be prevented and meandering of the strip 2 can be prevented.

Therefore, the pinch roll device of the present invention has a simple structure and has an excellent effect that a strong pressing force can be given.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of a pinch roll device of the present invention.

FIG. 2 is an overall configuration diagram showing a second embodiment of the pinch roll device according to the present invention.

FIG. 3 is a control state diagram of the pinch roll device of the present invention.

FIG. 4 is an example of an operation diagram of the pinch roll device of the present invention.

FIG. 5 is an explanatory diagram of hot rolling equipment.

FIG. 6 is an explanatory diagram of a conventional pinch roll device.

FIG. 7 is a schematic view of a drive unit of a conventional pinch roll device.

[Explanation of symbols]

 1 Rolling Machine 2 Strip 3 Run-out Table (Roller Table) 4 Cooling Device 6 Pinch Roll Device 7 Winder 8 Upper Roll 9 Lower Roll 10 Motor 11 Gear System 12 Worm Jack 13 Stopper Device 14 Air Cylinder 16 Upper Chock (Upper Bearing Part) ) 17 lower chock (lower bearing part) 18 hydraulic cylinder 20 servo valve 22 control device (pinch roll controller) 23 setting device 26, 27 pressure detector 29 position detector 30 piston 32 load cell 40 pressing force detector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Takayo 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries, Ltd. Yokohama Second Factory (72) Shiro Nagata Isogo-ku, Yokohama-shi, Kanagawa Shin Nakahara Town No. 1 Ishi Kawashima Harima Heavy Industry Co., Ltd. Yokohama No. 2 Factory (72) Inventor Hisato Sato Shin Nakahara Town No. 1 Shin Nakahara Town, Kanagawa Prefecture Kanagawa Prefecture Ishi Kawashima Harima Heavy Industry Co., Ltd. Yokohama No. 2 Factory (72) Inventor Toshio Imaseki 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Kawasaki Steel Corporation Steel Development & Production Division, Chiba Steel Works (72) Inventor Soichiro Onda 1 Kawasaki-cho, Chuo-ku, Chiba City Chiba Prefecture Kawasaki Steel, Ltd. (72) Inventor Nobuhiro Ito, Development & Production Division, Chiba Steel Works No. 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Iron & Steel Co., Ltd. Steel Development & Production Division Chiba Works

Claims (4)

[Claims] 1. A pinch roll device for sandwiching a strip between upper and lower pinch rolls and guiding the strip obliquely downward, a hydraulic cylinder individually supporting both axial end portions of the upper pinch roll, and a hydraulic oil of the hydraulic cylinder. A servo valve for adjusting the inflow / outflow amount, a position detector for detecting the piston position of the hydraulic cylinder, a pressing force detector for detecting the downward pressing force of the hydraulic cylinder, and a control device for controlling the servo valve, The pinch roll device is characterized in that the position control and the pressing force control of the upper pinch roll are thereby performed. 2. The pressing force detector is a pressure detector that detects the pressure on the head side and the rod side of the hydraulic cylinder.
The pinch roll device according to claim 1, wherein: 3. The pinch roll device according to claim 1, wherein the pressing force detector is a load cell provided in a bearing portion of the lower pinch roll. 4. The control device is configured to set a gap between the upper and lower pinch rolls by position control before entering the strip, and then detect entering of the strip to switch to pressing force control. The pinch roll device according to claim 1.