JPS6315329Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to roll cooling equipment.

Roll cooling equipment has recently attracted attention as equipment for rapidly cooling metal strips such as steel strips to a mineralized state.

Figure 1 shows an example of this cooling equipment. In the figure, X represents a metal band, which is cooled while successively contacting the cooling roll 1. #2 and #4 of cooling roll 1
The roll is equipped with a lifting device 2 that lifts and lowers the roll using a motor M and gears, and is capable of moving up and down in the vertical direction. By raising and lowering these #2 and #4 rolls, cooling roll 1 and metal strip
The plate temperature is controlled by changing the contact length with the plate. In the figure, reference numeral 3 denotes a temperature meter provided on the exit side of the cooling roll 1, and the controller 4 controls the lifting device 2 to maintain a predetermined temperature. In addition, 5, 5 is a bridle roll which is a tension adjustment mechanism.

In such equipment, it is possible to sufficiently cope with normal line speed changes, for example, speed changes of about 10 mpm/5 min, and it is possible to control the temperature of the metal strip.

However, if a problem occurs with the inlet or outlet equipment and it is necessary to rapidly reduce the line speed or stop the line, the contact length between the cooling roll 1 and the metal strip can be rapidly reduced. It was not possible to prevent the metal band from overcooling. As a result, in extreme cases, there was a risk that the metal band would be "squeezed".

Figure 2 shows the relationship between the line speed and the plate temperature at the exit side of the cooling roll when cooling a 0.5 x 1100 mm steel strip. It can be seen that when the line speed is rapidly decelerated in this way, the change in contact length by the lifting device 2 cannot be followed up, the plate temperature rapidly decreases, and throttling occurs.

On the other hand, JP-A-57-23035, JP-A-57-23032, etc. propose equipment in which the roll is raised and lowered by a cylinder in order to change the contact area of the cooling roll with the metal strip. .

However, although this type of cylinder lift can achieve a high lifting speed, it has the disadvantage that highly accurate temperature control in the longitudinal direction of the metal strip is difficult due to the inherent hunting and poor followability of the cylinder.

This invention was made to improve such conventional drawbacks, and as a means for raising and lowering the cooling roll,
A lifting device equipped with an electric motor that allows fine temperature settings and rapid temperature control according to changes in the thickness, temperature, speed, etc. of the metal strip in the longitudinal direction;
A means is provided in which the cooling roll is combined with a lifting cylinder that can rapidly open the metal strip to make it non-contact, or conversely bring it into rapid contact with the metal band, and also to appropriately control these lifting means depending on the situation. By providing this, it is possible to appropriately cool the metal strip regardless of line troubles.

In other words, the roll cooling equipment of the present invention includes a tension adjustment mechanism disposed before and after the cooling roll group in the line direction, a lifting device using an electric motor that supports the cooling roll so that it can rise and fall, and an elevator that supports the lifting device so that it can rise and fall. a temperature meter on a metal band placed between the cooling roll group and the tension adjustment mechanism behind it, and a lifting device and a lifting device based on the temperature detected by the thermometer. It consists of a controller that controls the electric motor and the operating mechanism of the lifting cylinder to operate the cylinder, and a controller that inputs a line stop signal to the operating mechanism to operate the lifting cylinder.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 3, the same parts as in FIG. 1 are designated by the same numbers. In this embodiment, cylinders 10, 10 are provided for raising and lowering the lifting device 2 and the entire cooling rolls 1 of #2 and #4. The cylinders 10, 10 are driven by a valve stand 11. A control signal from the controller 4 and a line stop signal 12 are input to the valve stand 11, and these signals cause the cylinder 1 to stop.
0 and 10 are driven, and the cooling rolls #2 and #4 are opened so that they are not in contact with the metal band X.

The controller 4 outputs a control signal to make the cooling roll 1 non-contact depending on the plate thickness. Fourth
The figure shows the relationship between the plate thickness and the temperature of the outlet plate in °C, which is assumed to be non-contact. The controller 4 outputs a control signal to the valve stand 11 to make the valve stand non-contact when the temperature detected by the thermometer 3 falls below a predetermined value, depending on the plate thickness.

In response to this control signal, the valve stand 11 lowers the cylinder 10 to bring the #2 and #4 cooling rolls out of contact with the metal band X.

A line stop signal 12 is input to the valve stand 11 from another controller, and even when the line is stopped, the cylinder 10 is driven to make the cooling roll non-contact.

Next, the operation will be explained.

If a problem occurs and the line speed decreases, the fifth
As shown in the figure, the outlet plate temperature gradually decreases, but when it reaches a predetermined temperature depending on the plate thickness, the controller 4
A control signal is output from the cylinder 10, the cylinder 10 is operated, the cooling rolls #2 and #4 are lowered, and the entire cooling roll 1 is brought out of contact with the steel strip. From this point on, the temperature decreases gradually, so there is no occurrence of "throttling" or the like. In addition, if the line suddenly stops, a line stop signal is input to the valve stand 11, and the cooling roll 1 and the metal band X are similarly brought out of contact.
Since the water is not rapidly cooled, there is no occurrence of "squeezing" or the like.

As explained above, the roll cooling equipment of the present invention, as a means for raising and lowering the cooling roll, is capable of finely setting the temperature, and is also capable of quickly controlling the temperature in response to changes in the thickness, temperature, speed, etc. in the longitudinal direction of the metal strip. A lifting device equipped with an electric motor, and a cooling roll that quickly opens against the metal band to make it non-contact.
On the other hand, by combining a lifting cylinder that can make rapid contact, and by providing a means to appropriately control these lifting means depending on the situation, the temperature of the metal strip can be controlled regardless of line troubles, etc. can be carried out appropriately. In other words, fine and quick temperature control is possible, and once a problem occurs, the cooling roll and metal strip can be quickly brought out of contact.
It is possible to prevent "throttling" and the like due to overcooling of the metal band. In addition, the cylinder mechanism allows rapid deceleration,
Sudden acceleration after a sudden stop and contact of the cooling roll during sudden operation can also be appropriately achieved.

[Brief explanation of drawings]

Figure 1 is a front view of conventional roll cooling equipment, Figure 2 is a front view of conventional roll cooling equipment;
Figure 3 is a front view of an embodiment of the roll cooling equipment according to the present invention, Figure 4 is a graph showing the relationship between plate thickness and outlet plate temperature in a non-contact manner, and Figure 5 is a diagram illustrating its operation. FIG. 3 is an explanatory diagram of the operation of an embodiment of the present invention. In the figure, 1 is a cooling roll, 2 is a lifting device,
3 is a thermometer, 4 is a controller, 5 is a bridle roll, 10 is a cylinder, 11 is a valve stand, and 12 is a line stop signal.

Claims (1)

[Scope of utility model registration request] In a metal strip roll cooling equipment equipped with a group of cooling rolls, there is a tension adjustment mechanism arranged before and after the line direction of the group of cooling rolls, a lifting device using an electric motor that supports the cooling roll so that it can be raised and lowered, and a lifting device that lifts and lowers the lifting device. A temperature meter on a metal band placed between a lifting cylinder that can be supported, an operating mechanism of the lifting cylinder, a cooling roll group and a tension adjustment mechanism behind the cooling roll group, and a temperature detected by the temperature meter. Roll cooling equipment consisting of a controller that controls the electric motor and the operating mechanism of the lifting cylinder to operate the lifting device and the lifting cylinder, and a controller that inputs a line stop signal to the operating mechanism to operate the lifting cylinder.