JPS61193709A - Hydraulic circuit - Google Patents

Abstract

PURPOSE:To decrease uniformly the wear of a roll and to improve the accuracy of a machine to be rolled by detecting exactly the position of the roll by shifting devices and matching the center of the rolling mill and the center of the roll. CONSTITUTION:The shifting devices attached by means of pins 44, 45 to an operation side housing 49 are made operatable in the axial direction of the roll 47 by shifting cylinders 32, 33 via fulcrums 42, 43. Keeper plates 38, 39 and cylinders 36, 37 are attached to the roll shifting devices 34, 35 in order to engage the operation side metal chock 45 and the shifting devices. Roll position detectors are connected to the devices 34, 35. The position of the roll is exactly detected by the movement of the devices 34, 35 and solenoid selector valves 6, 13, 14, 18 are controlled.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a hydraulic circuit, and particularly to a method for accurately setting the position of a new roll when changing rolls in a rolling mill equipped with a roll shift device. Regarding hydraulic circuits that can be used.

[Background of the invention]

A rolling mill that combines work roll shifting and roll pending trucks is described in Patent No. 836,270. However, the following considerations were not made regarding role reshuffling.

(1) The roll transfer device for roll change is engaged with the lower roll side, and the upper roll is stacked on top of the lower roll and replaced at the same time. However, when stacking new rolls for replacement, the upper and lower rolls are It is difficult to completely align the keeper plate setting surface that runs along the end surface of the roll bearing, and some misalignment may occur.

For this reason, when installing a new roll, when setting the keeper plate, even if you can set the keeper plate for either the upper or lower roll, you cannot set the other keeper plate. There is.

(2) Since the shift device is fixed by a shift cylinder, when the roll bearing hits the shift device when changing a new roll, it is impossible to shift it any further depending on the roll transfer device mentioned above, and (1) In addition to the problem of
There is a problem in that it is not possible to eliminate the misalignment between the pass center of the rolling mill and the axial center of the new roll. Therefore, after replacing the new rolls, it was necessary to perform an additional operation to align the pass center of the rolling mill with the axial center of the new rolls using the shift cylinder.

[Purpose of the invention]

The purpose of the present invention is to use a roll shift device to accurately detect the position of the rolls to facilitate center alignment between the center of the rolling mill and the center of the rolls, and to use a chock clamp device when installing the rolls to It is an object of the present invention to provide a hydraulic circuit for a rolling mill with a roll shift that can reliably solve the problem of misalignment of stacking positions.

[Summary of the invention]

The present invention uses a shift circuit to shift the rolls during rolling, and when rearranging the rolls, a low pressure circuit and a free state circuit are installed in parallel in the shift circuit, and a roll transfer device pushes out the old roll. , the shift device is made to follow at low pressure so that it can wait at a predetermined position for installation of the new roll, and the shift circuit is also switched to a free state where extremely low pressure oil is contained, and the new roll is rolled. When retracting into the machine, it is possible to transfer a new roll without putting an extra load on the roll transfer device, and it is also possible to push back the shift devices for the upper and lower rolls as the transfer occurs.

This eliminates the problem with the keeper plate device due to misalignment when stacking rolls, and the shift device equipped with the shift device! The position of the roll is detected by the detection mechanism,
This made it possible to align the center of the rolling mill with the axial center of the new roll.

The confining pressure in the free state is the opening pressure of the check valve (
o, asKf/cfA).

Furthermore, in order to prevent an increase in the load on the roll transfer device when changing the roll size, etc., the hydraulic circuit was switched to low pressure, making it possible to push the new roll into the rolling mill using the shift device.

[Embodiments of the invention]

FIG. 1 shows a hydraulic circuit and a roll shift device showing one embodiment of the present invention.

Hydraulic fluid 2 is stored in tank 1, and is connected to υ pipe 4 by pump 3, which supplies pressure oil to cylinders 32, 33 that operate shift devices 34, 35, and keeper plate cylinders 36, 37. Configures the supply hydraulic pressure source.

An electromagnetic switching valve 6, a flow control valve 7.8, and a pilot check valve 9.10 are provided between the hydraulic pressure source and the cylinder, and constitute a high-pressure roll shift circuit.

In addition, a pressure reducing valve 12, an electromagnetic switching valve 13.14, and a pilot check valve 15.16 are provided, and an electromagnetic switching valve 18 and a conduit 19 for supplying pilot pressure to the pilot check valve are provided to form a roll changing circuit. are doing. The electromagnetic switching valve 22 and the throttle valves 23 and 24 constitute a chock clamp circuit, and the keyhar plates 38 and 39 are attached and detached. A check valve 17 is provided in the drain oil pipe of the electromagnetic switching valve 13 .

The roll 47.66 has a metal chock 46.6 on the operating side.
5 and drive side metal chock 48.67 are installed, operating side metal chock 65 and drive side metal chock 6.
7 is equipped with wheels 61, 62 and set bins 63, 64 for engaging the upper and lower roll assemblies.

This roll assembly includes a backup roll 56,
570, and is incorporated into the operation side housing 49 and the drive side housing 50 via a rail 59.

The roll assembly is also likely to engage a spindle 55,70 which is directly connected to the mill drive.

The roll transfer devices 53, 54 and the latches 51, 52 are for pushing and pulling the roll assembly to release or engage the roll and spindle when changing rolls, and are used to release or engage the roll and spindle when replacing the old roll assembly and extrusion. This is to allow the new roll assembly to be retracted. Furthermore, the roll transfer device 53,54 is meshed with a pinion 58 which is a drive source.

A shift device attached to the operating housing 49 by a pin 44.45 is operable in the axial direction of the top roll 47.66 by means of a shift cylinder 32.33 via a fulcrum 42.43.

Also, keeper plates 38, 39 and cylinders 36, 37 are attached to the roll shift device in order to engage the operating side metal chock 46, 65 with the shift device. A roll position detection device is connected to the roll shift device, and by movement of the roll shift device, the position of the roll is accurately detected and the electromagnetic switching valves 6, 13, 14, and 18 are controlled.

The roll assembly, the roll shift device, the shift circuit, the low voltage circuit, and the free circuit are arranged in pairs, upper and lower.

Next, the hydraulic circuit and roll changing operation according to the present invention will be explained.

In the roll rearranging operation, when pushing out the old roll, the operating side metal chock 46 is engaged with the shift device 34, 35, and the keeper plate 38, 39 is moved
6.Remove according to 37, and the metal chock 46 on the operating side is
Leave it open to the operator. Furthermore, the old roll assemblies 48, 47 . that were engaged with the spindle 55.
46, engages the drive side metal chock 67 via the roll transfer device 53,54 and pushes out the old roll assembly. In that case, the electromagnetic switching valve 13 is
4 is excited to the a side and 18 is excited to the a side, pressure oil is led from the pipe 4 to the pipes 28 and 29 via the pressure reducing valve 12, and low pressure is supplied to the cylinders 32 and 33.

Reduced pressure acts on the head side and the rond side of the cylinders 32, 33, and there is a difference in pressure receiving area by the cross-sectional area of the rond, generating an extremely small force in the direction of extruding the roll assembly.

Therefore, when the roll is pushed out by the roll shifting device, the shift device 34.35 rotates around the fulcrum 44.degree. 45 following the operating metal chock 46.65.

After extruding the old roll assembly, the roll transfer device
Pull in the new roll assembly.

At that time, the electromagnetic switching valve 13 is energized to the b side, 14 is energized to the a side, and 18 is energized to the a side, and the cylinder 32.33 is filled with only the cranking pressure of the check valve 17 (approximately 9/i to 0.35). The metal chock on the operating side is 46.65,
When the shift device 34, 35 is contacted, it is pushed back to follow the new roll assembly.

As a result, when stacking the top and bottom of the new roll assembly, even if there is a slight misalignment, the metal chock 46.6
5 is in contact with the keeper shift device 34 and 35, so the keeper
Play) 38 and 39 can be installed securely. or,
A roll shift amount detection device is attached to each of the shift devices 34 and 35, and by detecting the position of the roll, the roll shifting device is driven until the centers of the rolls are aligned.

In addition, when the load on the roll transfer device increases due to an increase in the size of a new roll assembly, etc., the electromagnetic switching valve 13 is energized to the a side, 14 to the b side, and 18 to the a side, and the pressure is reduced by the pressure reducing valve. Pressure oil can be led into line 29 and supplied to the rond side of cylinders 32, 33 to assist in loading the roll transfer device.

Next, in the roll shift operation during rolling, when the roll center is aligned with the center of the rolling machine by the roll shift device, the upper and lower back rolls come into contact with each other and the roll becomes ready for rolling.

From that point on, the upper and lower roll assemblies are shifted axially in opposite directions relative to each other to control the shape of the rolled strip and reduce roll wear.

This roll shift operation is controlled by the electromagnetic switching valve 6.

〔Effect of the invention〕

According to the present invention, alignment between the center of the roll and the center of the rolling machine can be facilitated, the wear distribution of the roll can be made uniform, the problems of meandering and unevenness of the rolling mill can be solved, and the rolling mill can be easily aligned. accuracy can be improved.

[Brief explanation of drawings]

Fig. 1 is a mechanical diagram of a hydraulic circuit and roll shift device according to an embodiment of the present invention, Fig. 2 is a view taken along the ■-■ arrow in Fig. 1, and Fig. 3 is a hydraulic circuit configuration of a conventional roll shift. It is a diagram. 1... Tank, 2... Hydraulic fluid, 3... Pump, 4゜5.28, 29, 30, 31.19... Pipe line,
6113.14.18.22... Solenoid switching valve, 12.
...Decompression expansion, 7.8, 23.24... Throttle valve, 17.
...Check valve, 9,10,15.16...Pilot check valve, 32,33,36.37...Cylinder, 38.39...Keeper plate, 34.35.
... Shift device, 40.41 ... Roll position detection device, 42.43, 44.45 ... Fulcrum bin, 46.65
...Operation side metal chock, 48.67...Drive side metal chock, 47.66...Roll, 61.62
...wheels, 59.60...rails, 63.64...
・Set bin, 49.50...Housing, 56.5
7... Backup roll, 55.70... Spindle, 53.54... Roll transfer device, 51.52...
... Latch, 58... Drive device for the binion or roll transfer device.

Claims (1)

[Claims] 1. In a rolling mill equipped with a shift device capable of moving the rolls in the axial direction, a four-way switching valve of a tank port block is installed in a hydraulic circuit that supplies pressure oil to a cylinder for the shift device. and a two-position four-way switching valve are connected in series, a check valve is provided at the oil return port of the switching valve on the pressure oil source side, and a switching valve for opening and closing the pilot check valve is further installed in parallel. circuit.