JPS599243B2 - Atsuenkino Atsuenyukiyoukiyuusouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rolling mill that supplies rolling oil to a header at a constant speed regardless of the rolling speed, thereby preventing separation of oil and water in the rolling oil. This is related to the rolling oil supply device.

In cold rolling mills and hot rolling mills in rolling mills of steelmaking machinery equipment, rolling oil is used during rolling.

As a device for sending this rolling oil to a rolling mill, there is a conventional device as shown in FIG.

In the figure, a is a pump driven by a DC motor b, and rolling oil (an emulsion of oil and water) discharged from pump a is passed from a two-position three-way valve C through piping d to headers e and e'. and is discharged from the nozzle portions of the headers e and e' onto the front and back surfaces of the rolled material.

Furthermore, when the rolling speed changes, it is necessary to send a corresponding amount of rolling oil from pump a to headers e and e'.

Therefore, in this case, the rolling mill speed setting signal f is sent to the control unit g, and the control unit g controls the DC motor b.
The discharge amount of rolling oil is adjusted by sending a rotation signal to and changing the rotation speed of DC motor b.

Note that h in the figure is a pressure oil tank, and 1 is a work roll.

In such conventional equipment, when the rolling speed becomes low, the flow velocity in the pipe d of the rolling oil sent from the pump a to the headers e and e' is equal to the flow rate in the pipe d due to the pump discharge amount at the maximum rolling speed. Since the flow rate is significantly slower than that of the rolling oil, a separation phenomenon occurs between water and oil in the rolling oil, and the quality of the rolled strip IJ strip deteriorates.

The present invention was made for the purpose of eliminating the above-mentioned drawbacks, and a header is attached via piping to a rolling oil supply pump that can be driven by an AC motor, and a rolling oil supply pump is installed downstream of the header. A rolling mill characterized in that a valve is installed whose opening degree can be adjusted by an amount corresponding to a machine speed setting signal, and a pipe is connected to the valve for returning excess rolling oil to a pressure oil pump. This is related to the oil supply device.

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

In Fig. 2, 1 is a work roll, 2 is a strip to be rolled,
3 and 3' are headers having nozzles.

Pipes 4, 4' are connected to one end of the headers 3, 3', and are driven by an AC motor 8 via a pipe 5 having a two-position three-way valve 6. A pump 7 for supplying rolling oil is installed.

At the other end of the header 3, 3' are pipes 15, 15'.
Attached are solenoid valves 9, 9' via which the solenoid valves 9, 9' are linked with a control unit 10 which is able to receive a rolling mill speed setting signal 11.

Further, the solenoid valves 9, 9' are connected to a pressure oil cylinder 14 via a pipe 13 having check valves 12, 12'.
The pressure oil tank 14 is connected to the above-mentioned pump 7 via piping.

The rolling oil, which is an emulsion of oil and water, is heated to 1 by the AC motor 8.
The driven pump 7 sucks oil from the pressure tank 14 into the pump 7, applies pressure with the pump 7, and discharges it into the piping 5, passing through the piping 4, 4' to the headers 3, 3.
', the rolling oil flows through the nozzle according to the rolling speed.
- The excess rolling oil is injected onto the front and back surfaces of the IJ tap 2 and returns to the pressure oil tank 14 through the solenoid valves 9, 9' and the piping 13.

When the rolling speed changes, the rolling mill speed setting signal 11 is sent to the control units 1 and 10, and the control unit 10 sends a signal to the solenoid valves 9 and 9'. The amount corresponds to the speed.

Since the rotational speed of the AC motor 8 is constant even if the opening degree of the solenoid valves 9 and 9' changes, the amount of rolling oil discharged from the pump 7 is constant, and the flow rate of the rolling oil in the pipe 5 is almost constant. An almost constant amount of rolling oil is always supplied to the headers 3 and 3'.
supplied to

On the other hand, since the opening degrees of the solenoid valves 9 and 9' are adjusted according to the rolling speed, the amount of rolling oil injected from the headers 3 and 3' to the front and back surfaces of the strip 2 is adjusted according to the rolling speed. amount.

Therefore, by setting the flow velocity in the pipe 5 to a certain value, separation of rolling oil can be prevented.

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

Since the rolling oil supply device for the rolling mill of the present invention has the above-described configuration, it is possible to: (1) allow rolling oil to flow at a constant flow rate from the pump to the header regardless of the rolling speed, eliminating the separation phenomenon of rolling oil; , the quality of the slip is therefore significantly improved.

By adjusting the opening of the old solenoid valve, the amount of rolling oil spouted out can be easily changed according to the rolling speed, and the
It is possible to keep the amount of squirt to the spout constant.

■) When using a DC motor as in the past, the amount of rolling oil ejected from the nozzle is adjusted by controlling the speed of the motor itself, but in the present invention, the rotation speed of the AC motor itself is constant and the speed control is not possible. Instead, the amount of rolling oil ejected from the nozzle is adjusted by controlling the solenoid valve.

Therefore, in the present invention, control of the entire device is easier than in the conventional method.

It exhibits various excellent effects.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a rolling oil supply device for a conventional rolling mill, and FIG. 2 is an explanatory diagram of a rolling oil supply device for a rolling mill according to the present invention. 3, 3' are heso-goo, 5 is piping, 6 is 2-position three-way valve, 7
8 is a pump, 8 is an AC moke, 9 and 9' are electromagnetic valves, and 13 is a pipe.

Claims (1)

[Claims] A header is attached via piping to a rolling oil supply pump that can be driven by an AC motor, and a header is installed downstream of the header so that the opening degree can be adjusted by an amount corresponding to the rolling mill speed setting signal. A rolling oil supply device for a rolling mill, characterized in that a valve is attached to the valve, and a pipe for returning excess rolling oil to the pressure oil pump is connected to the valve.