JPH0239601Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a thin steel sheet skin pass rolling facility that facilitates switching between wet skin pass rolling and dry skin pass rolling.

Thin steel sheets, such as steel sheets for tinplates and steel sheets for stain-free use, are temper-rolled for the purposes of adjusting the degree of temper, adjusting the surface roughness, correcting the shape, eliminating elongation at yield point, and the like.

Temper rolling of thin steel plates is carried out using 1- to 4-high rolling mills or 6-high rolling mills.
The temper rolling method is carried out in a three-tandem rolling facility, and either the so-called wet method, which uses roll cooling water, rolling lubricant, etc., or the dry method, which does not use any of these, is used. In general, wet temper rolling is applied to cold-rolled steel sheets, and dry temper rolling is applied to thin steel sheets, but this is not necessarily the case.
As disclosed in Japanese Patent No. 19142, temper rolling of thin steel sheets may also be carried out in a wet manner. Further, depending on the thin steel sheet to be temper-rolled, wet temper rolling or dry temper rolling is performed. That is, temper rolling is carried out by appropriately switching between wet and dry rolling.

Furthermore, recently, regular cleaning has been carried out during dry temper rolling as a measure to prevent surface flaws caused by dust and the like generated in temper rolling equipment.

When transitioning from wet to dry temper rolling, or when cleaning a temper rolling mill, it is important to ensure that even a small amount of rolling lubricating oil or moisture does not remain on the rolls. This is important for preventing local elongation during rolling, ensuring flatness, and preventing surface patterns. In addition, from the viewpoint of productivity, it is necessary to carry out the process in as short a time as possible.

(Prior art) Conventionally, this cleaning and drying method involves cleaning the inside of rolling equipment with cleaning water that replaces rolling oil in the rolling oil tank of a rolling oil supply device consisting of a rolling oil tank, a rolling oil nozzle, etc. The reality is that some areas are manually maintained and left to dry naturally. This makes it difficult to complete cleaning and drying in a short period of time, as the rolling mill itself has a complex shape and the space for human intervention is limited. teeth
This amounted to 10 to 20 hours, which was a major factor in reducing efficiency.

In addition, in conventional equipment that only performs dry temper rolling, as described in Japanese Patent Application Laid-open No. 75212/1983, a brush roll made of nonmetallic material such as nylon that blows out pressurized gas is placed in contact with the surface of the work roll. There is one that uses pressurized gas and a brush roll to remove dust and the like from the surface of the work roll, and then performs dry temper rolling.

However, in an apparatus that appropriately switches between dry and wet temper rolling, cleaning and drying are actually performed in the manner described above.

(Problems to be solved by the invention) The present invention was made in view of the above-mentioned circumstances, and it completely cleans and dries the skin-pass rolling equipment and performs this in a short time. The purpose is to smoothly switch between dry rolling and dry temper rolling. The gist is that a cleaning device is connected to the supply pipe via a rotary joint on one or both of the front and rear surfaces of the temper rolling stand and injects cleaning water toward the rolls. A drying device that is connected to the rollers and sprays a drying medium onto the rolls to dry moisture on the rolls, and a cleaning tank that is equipped with a device that heats the cleaning water supplied to the cleaning device. Located in the rolling equipment.

(Means for Solving the Problems) The present invention will be described in detail based on one embodiment with reference to the drawings.

In the drawings, 1 is a thin steel plate. 2 is a work roll, 3 is a back-up roll, and in this embodiment, two four-high temper rolling stands are arranged in tandem.

4 is a bridle roll that applies a predetermined tension during temper rolling.

5 is a rolling oil tank, and a pump 6 is connected from the tank 5.
The rolling lubricating oil is sent to the nozzle 7 through the nozzle 7 for wet temper rolling.

Reference numeral 8 denotes a cleaning device that sprays cleaning water, such as a nozzle, which is connected to a supply pipe 10 via a rotary joint 9 so that the spraying direction to the rolls 2 and 3 can be varied.
It is connected to. Although the nozzle 8 is provided on both the front and rear surfaces of the temper rolling stand in this embodiment, it may be provided on either the front or rear surface depending on the installation space.

11 is a cleaning tank, and 12 is a pump. A cleaning tank 11 is installed to strengthen the cleaning action.
A heating device (not shown) is provided.

Reference numeral 13 denotes a drying device that injects a drying medium such as hot air or gas to the rolls 2 and 3. As the drying device 13, for example, a hot air nozzle or the like is used.

Similar to the cleaning nozzle 7, this hot air nozzle 13 is provided on one or both of the front, rear front, and rear surfaces of the temper rolling stand. Further, it is connected to the supply pipe 10-1 via a rotary joint 9-1 so that its injection direction is also variable. 14 is a blower,
15 is a dryer.

The cleaning nozzle 8 and the hot air nozzle 13
are provided at intervals in the roll axis direction on the attachment tube 16, and are arranged in plural in parallel as shown in FIG.

Since the mounting pipe 16 is rotatably connected to the rotary joints 9 and 9-1, the cleaning nozzle 8,
The hot air nozzle 13 is rotatable. The structure of the present invention is as described above, and the operation will be described next. When changing from wet skin-pass rolling to dry rolling, or when cleaning the skin-pass rolling mill, stop the injection of rolling lubricating oil, and then use a dedicated cleaning tank heated with, for example, steam or an electric heater. Hot water 11 is sprayed onto the rolls 2 and 3 through a nozzle 8 for cleaning. In this case, if the temperature of the cleaning water is too high, it may damage other equipment, and if it is too low, the cleaning effect will be reduced, so a temperature of 30 to 80°C is appropriate. However, water is usually used as the washing water, but if a detergent is added, the water may be lower temperature. The higher the injection pressure is, the more advantageous it is, but in consideration of economic loss, a range of 3 to 10 kg/cm ² is appropriate.

Next, the injection of washing water is stopped, and the hot air nozzle 13 is activated to perform drying, but the air is removed from the dryer 1.
Raise the temperature to 30 to 80℃ in step 5 to create hot air, and blow with blower 14.
Rotatable hot air nozzles 13 are provided on the front and rear surfaces of the temper rolling stand through the supply pipe 10-1.
The rolls 2 and 3 are dried. Regarding the temperature of the hot air, a temperature of 30 to 80°C is appropriate for the same reason as for the washing water.

In this way, if the rolls 2 and 3 are dried by spraying hot air immediately after cleaning, they will be completely dried without any rolling lubricating oil, its residue, or moisture remaining on the rolls, and the required time will be shortened. It's time.

Regarding the hot air nozzle 13, as shown in Fig. 3, a rotary type nozzle is adopted in which the hot air nozzle 13 connected to a chain sprocket 16 is rotated by an electric motor 17, but a fixed angle oscillating type nozzle or a fourth type nozzle is used. Nozzle 1 with multiple discharge ports as shown in the diagram
8 may be used. The same thing can be said about the cleaning nozzle. The number of nozzles for cleaning and hot air is appropriately selected according to the type of temper rolling mill and the size (surface area) of the mill.

(Effects of the invention) With the invention, the cleaning time, which used to be 10 to 20 hours, can be shortened to 1 hour, and a decrease in efficiency can be avoided. Furthermore, since the rolls 2 and 3 are completely washed and dried, local elongation, surface flaws, surface patterns, etc. are prevented in the subsequent temper rolling, and the rolls are thin with excellent shape and quality. Steel plates are manufactured.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a plan view showing the arrangement of nozzles in an embodiment of the invention, Fig. 3 is a diagram showing a rotary nozzle, and Fig. 4 is a multi-stage discharge nozzle. It is a figure which shows an outlet nozzle. 1... Thin steel plate, 2... Work roll, 3... Backup roll, 4... Bridle roll, 5
... Rolling oil tank, 6 ... Pump, 7 ... Rolling oil nozzle, 8 ... Cleaning nozzle, 9 ... Rotating joint,
9-1... Rotating joint, 10... Supply piping, 10-
1... Supply device, 11... Washing tank, 12...
Pump, 13...Drying nozzle, 14...Blower, 15...Dryer, 16...Chain sprocket, 17...Electric motor, 18...Multi-stage nozzle, 19...Chain.

Claims (1)

[Scope of utility model registration request] A cleaning device is connected to the supply pipe via a rotary joint and sprays cleaning water toward the rolls, and a drying medium is connected to the supply pipe via the rotary joint, on one or both of the front and rear sides of the temper rolling stand. A drying device for spraying water onto the rolls to dry water on the rolls, and a cleaning tank equipped with a device for heating the cleaning water supplied to the cleaning device. Device.