JP2664184B2 - Roll coolant spray control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll coolant apparatus, and more particularly to a spray control apparatus for a roll coolant apparatus suitable for use in a cold rolling mill.

[Conventional technology]

In the cold rolling mill, it is necessary to control the spray of the roll coolant according to the rolling state and the strip width. Particularly in the rolling of aluminum, the demand is strong. On the other hand, since the space around the rolling mill main body is limited, even if the function is increased as required, it is not possible to increase the number of pipings for the function.

As described in Japanese Patent Publication No. 54-30986, the conventional apparatus is operated by a boost pump using the same fluid as the liquid for roll coolant as a pilot fluid for spray control due to space limitations. It was.

[Problems to be solved by the invention]

In the above prior art, no consideration is given to the contamination of the roll coolant, and since the roll coolant is also used as a pilot fluid, the roll coolant is contaminated, and the seal portion is damaged by the contaminated roll coolant, There was a problem that the boost pressure was reduced, the valve closing was reduced, and the spray control of the roll coolant was incomplete. Another problem is that the boost circuit is expensive. Further, when a fluid leaks in the pilot fluid circuit, there is another problem that even when the roll coolant is not sprayed, the coolant falls on the rolling mill, causing uneven quality in the rolled product.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roll coolant spray control device capable of preventing contamination of a roll coolant, improving the reliability of spray control, and appropriately supplying two types of coolant to uniform rolled plate accuracy. Is to provide.

[Means for solving the problem]

The object of the present invention is to provide a roll coolant spray control device comprising: a plurality of nozzles for spraying a coolant to a roll of a rolling mill; and a plurality of spray control valves provided for each nozzle section of the nozzle. A first coolant circuit and a second coolant circuit for individually supplying coolant to each other, and a pilot circuit for controlling opening and closing of the first coolant circuit and opening and closing of the second coolant circuit. This is achieved by providing an electromagnetic valve in the pilot circuit for controlling the injection of a pilot fluid at two different pressures into the valve, wherein the fluid in the pilot circuit is a fluid separate from the coolant.

[Action]

Since the fluid of the pilot circuit for controlling the spray of the coolant is a fluid separate from the coolant, the contamination of the roll coolant can be prevented, and the reliability of the spray control can be improved.

Further, a first coolant circuit and a second coolant circuit that individually supply coolant to the spray control valve, and a pilot circuit that controls opening and closing of the first coolant circuit and opening and closing of the second coolant circuit are included. By providing an electromagnetic valve for controlling the injection of pilot fluid of two kinds of pressures in the spray control valve in the pilot circuit, it is possible to selectively supply pilot air pressure, that is, supply high pressure or low pressure, and to provide two kinds of temperatures, namely High and low temperature coolant can be selectively sprayed on the rolls of the rolling mill, and even when normal roll coolant is sprayed, low temperature coolant is sprayed on places where the elongation of the strip is partially large, and the rolled plate accuracy of the strip is uniform. It can satisfy the demand for high quality such as

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 schematically shows a fluid circuit diagram according to an embodiment of the spray control device of the present invention. A roll pump is supplied from a roll cooler storage tank 2 to a roll 3 of a rolling mill by a supply pump 1, and the supply pump 1 is driven by a motor 4. A main circuit coolant 5 for cooling the coolant is provided downstream of the pump 1, and the coolant can be further cooled by a cooler 6 provided in a sub-circuit branched from the main circuit.
Here, the coolant supplied from the main circuit to the roll 3 is referred to as "main circuit coolant", and the further cooled coolant supplied to the roll 3 through the sub-circuit is referred to as "spot coolant". The main circuit coolant from the main circuit is supplied to the nozzle header 9 via the three-way valve 7 and the line 8, and the spot coolant from the sub-circuit is supplied to the nozzle header 9 via the three-way valve 10 and the line 11.

In this embodiment, there is provided a pilot circuit 12 for controlling the spray of the coolant from the nozzle header 9 to the roll 3 of the rolling mill, and the pilot fluid of this circuit uses a fluid different from the coolant, for example, air. I do. The pilot circuit 12 includes an air solenoid valve unit 13 for controlling a pilot pressure for operating a spray control valve (described later), a factory compressed air source 14, and a compressed air pressure of a constant pressure, for example, 4 kg / cm ² . A pressure reducing valve 15 for setting pressure,
A boost pump 16 for boosting the compressed air to a boost pressure of, for example, 9 kg / cm ² , and a pressure reducing valve 17 for driving the boost pump.
And conduits 18 and 19 connecting these.

FIG. 2 shows the nozzle header 9 to which the pilot circuit 12 and the spray control valve 20 of FIG. 1 are attached. In FIG. 2, the nozzles are shown as being associated with eight nozzle sections, and a spray control valve 20 is provided for each nozzle section. Low-pressure air from the pilot circuit 12 is sent to the solenoid valve 21 via the pipe 19 via the pressure reducing valve 15, and high-pressure air from the pilot circuit is sent to the solenoid valve 21 via the air solenoid valve 22 via the pipe 18 from the boost pump 16. . In this case, a check valve 23 is provided on the low-pressure air side to prevent high-pressure air from flowing back to the low-pressure air side. The solenoid valve 21 switches between low-pressure air and high-pressure air, sends low-pressure air or high-pressure air to a pilot air pressure header 24, and supplies air to a corresponding spray control valve 20 via a flexible hose 25. Since the spray control valve 20 is provided for each nozzle section, the solenoid valve 21, the air solenoid valve 22, and the check valve 23 are provided.
Are also provided for each nozzle section. Spray control valve 20
Is attached to a nozzle header 9 to which a main circuit for the main circuit coolant and a sub-circuit for the spot coolant are connected.

FIG. 3 is a sectional view of the spray control valve 20. The spray control valve 20 comprises a valve body 26 and a header 27 for receiving main circuit coolant coming from the main circuit via line 8 (FIG. 1).
And a bedder 28 for receiving the spot coolant coming from the sub-circuit via line 11. These headers 27,28
Is fixed to the main body 26 in an airtight manner by a suitable means such as welding in a longitudinal direction thereof, and prevents leakage of the coolant to the outside. The spray control valve 20 further includes a plurality of spray nozzles 29 mounted on the valve body 26, a movable poppet 30 for spot coolant mounted in the valve body, and a movable poppet 31 for main circuit coolant mounted in the valve body. And an inlet port 32 for supplying pilot air pressure guided by the flexible hose 25, and an outlet port 33 when the movable poppet is operated.

Next, the operation of the present embodiment configured as described above will be described.

Pilot air pressure of pilot circuit 12 is applied to inlet port 32
When the main circuit coolant introduced to the header 27 is not supplied to the roll 27, the movable poppet 31 is pushed up by the pressure of the coolant itself and sprayed from the spray nozzle 29 to the roll 3 of the rolling mill through the passages 34 and 35 of the valve body. Is done. In this case, a movable poppet 30 for spot coolant
Remains closed by a spring 36 greater than the pressure of the spot coolant.

When low-pressure pilot air pressure is supplied from the pilot circuit to the inlet port 32, the pilot air pressure is introduced into the chamber 36 and acts on the movable poppet 31 to depress the movable poppet 31 against the pressure of the main circuit coolant. Close and shut off supply of main circuit coolant to spray nozzle 29. In this case, the low-pressure pilot air pressure is also introduced into the chamber 38 on the movable poppet 30 side, and attempts to push down the movable poppet 30 in cooperation with the pressure of the spot coolant supplied from the header 28 to the passage 39. 36
The force law is still strong, the movable poppet 30 remains closed, and no spot coolant is sprayed from the spray nozzle.

When high-pressure pilot air pressure is supplied from the pilot circuit to the inlet port 32, the movable poppet 31 remains closed and the main circuit coolant is not supplied to the spray nozzle 29 because a further high pressure acts in the chamber 37. on the other hand,
The high pressure introduced into the chamber 38 cooperates with the pressure of the spot coolant in the passage 39 and depresses the movable poppet 30 overcoming the force of the spring 36. For this reason, the spot coolant passes from the passage 39 through the passage 40 and is sprayed from the spray nozzle 29 onto the roll 3 of the rolling mill.

In supplying the pilot air pressure, when supplying a high air pressure, the air solenoid valve 22 of the pipe 18 is excited to supply the pipe air pressure.
When conducting low pressure air at a low pressure, the air solenoid valve 22 is de-energized to shut off the line 18 and
When the pilot air pressure is not supplied, the electromagnetic valve 21 is de-energized.

Thus, by the selective supply of pilot air pressure to the inlet port 32 of the spray control valve 20, i.e., the supply of high or low pressure,
A spot coolant or a main circuit coolant, that is, a high temperature and a low temperature coolant can be selectively sprayed onto the roll 3 of the rolling mill. For this reason, even if the normal roll coolant is sprayed, a high-quality demand such as uniforming the strip rolled plate accuracy by spraying a low-temperature coolant to a portion where the extension of the strip is partially large can be satisfied. .

According to the present embodiment, since the pilot fluid for performing the spray control of the coolant is a fluid separate from the coolant, there is no contamination of the coolant, and thus damage to the seal and imperfect spray control do not occur. effective. Further, the spray by the main circuit coolant, the spray by the spot coolant, and the stop of the spray at each spray control valve can be performed only by passing one flexible hose 25 into the rolling mill for each spray control valve 20. In addition, the number of pipes in the rolling mill body is small, and the quality of the rolled plate can be improved.

〔The invention's effect〕

According to the roll coolant spray control device of the present invention, since the fluid in the pilot circuit for controlling the spray of the coolant is made a fluid separate from the coolant, the contamination of the roll coolant is prevented and the reliability of the spray control is improved. In addition, there is an effect that the precision of the rolled plate can be made uniform by appropriately supplying two types of coolant.

[Brief description of the drawings]

FIG. 1 is a fluid circuit diagram of a roll coolant spray control device according to an embodiment of the present invention, FIG. 2 is a fluid circuit diagram of a portion related to the spray control valve of FIG. 1, and FIG. It is sectional drawing. 8: Main circuit coolant line, 11: Spot coolant line, 12: Pilot circuit, 16: Boost pump, 20: Spray control valve, 21, 22 ... Solenoid valve, 25 ...
… Flexible hose (piping), 30, 31 …… movable poppet.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shoichi Toyonaga 2-13-14 Imai, Chiba City, Chiba Prefecture Inside Toyohashi Machinery Co., Ltd. Showa 59-174208 (JP, A)

Claims (2)

(57) [Claims] 1. A roll coolant spray control device comprising: a plurality of nozzles for spraying a coolant to a roll of a rolling mill; and a plurality of spray control valves provided for each nozzle section of the nozzle. A first coolant circuit and a second coolant circuit that individually supply coolant to the valves, and a pilot circuit that controls opening and closing of the first coolant circuit and opening and closing of the second coolant circuit, wherein the spraying is performed. A solenoid valve for controlling the injection of a pilot fluid having two types of pressures in the control valve is provided in the pilot circuit, and the fluid in the pilot circuit is a fluid separate from the coolant; apparatus. 2. The spray control apparatus for a roll coolant according to claim 1, wherein a coolant temperature of said first coolant circuit and a coolant temperature of said second coolant circuit are made different from each other. Roll coolant spray control device.