JPS5847242B2 - Roll drive device in hot rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work roll drive device for strip rolling, particularly for a 1/i rolling mill Vc.

In general, a hot rolling mill, especially a hot strip mill finishing mill, has upper and lower work rolls 1.2 as shown in Figure 1.
Usually, power is applied from one drive motor 3 and one drive shaft 4 via a gear 5 of a pinion stand.

By the way, recently, by consciously changing the circumferential speed of the lower roll, it has been possible to improve the so-called strip threadability by controlling the vertical warpage of the strip head, and even if one roll is damaged.
There has been a demand for a system in which the upper and lower rolls are driven separately from the economical point of view that it is not necessary to grind the other roll to nearly the same diameter.

However, in the conventional drive system described above, the gear boxes are connected to each other, the upper and lower rolls cannot have a large difference in diameter, and the circumferential speed of the lower roll cannot be changed arbitrarily. First, even in the case of upper and lower roll grinding, there is a drawback that the grinding must be done to nearly the same diameter using the other roll casing, which is free of flaws.

On the other hand, as shown in Fig. 2, a method for driving the upper and lower rolls separately and independently is called a twin drive, in which drive motors with the same output are connected directly or via a gear box for the upper and lower rolls. A method of applying rolling power to the upper and lower rolls is also known, but in general, the load applied to the lower rolls differs between the upper and lower rolls, for example, there may be a difference of about 4 upper rolls and 6 lower rolls. However, when the upper and lower rolls are driven separately, there is a drawback that the drive motor capacity must have a margin.

In addition, in terms of equipment, the motor direct drive twin drive requires a large spindle angle θ due to motor space considerations, and the latter gearbox type twin drive requires a gearbox for high output, requiring investment and investment.
This necessitates an increase in maintenance costs.

Other examples of E lower row and +b% IJ drive include a method in which one roll side is driven by a slip clutch, and another in which one roll side is not driven, but in the former case, the upper and lower roll circumferential speeds are not control, in the latter case, upper and lower a
- If the plate thickness is such that the rolls do not come in contact with each other, there is a disadvantage that the speed of the non-driven rolls decreases during idle time.

The present invention solves all of these conventional problems, and moreover, we have studied the realization of separate drives for the upper and lower rolls.Basically, either the upper or lower work roll is the main drive. , a drive motor is attached to the other roll side as an auxiliary drive, and the auxiliary drive side also performs drive control, but in principle, the applied power is extremely high enough to pre-drive and accelerate/decelerate the rolls. A small capacity motor is sufficient.

The schematic structure of the present invention is as shown in FIG.
2 are upper work roll, lower work roll, 6 and 7 respectively.
A main drive motor 8 is connected to the lower work roll 2, and an auxiliary drive motor 9 is connected to the upper work roll 1.

Therefore, the drive motor on the main drive roll (lower roll 2 in the case of Figure 1) provides most of the rolling power required by the mill.
During rolling, the other auxiliary drive motor 6 is rotated at the same speed as the main drive roll or at a peripheral speed lower than that of the main drive roll.

In particular, even when performing one-sided main drive, it is important to provide such minimum rotation in order to prevent troubles when the strip gets caught.

FIG. 4 shows in detail the row four motion device according to the present invention.

Reference numerals 1 to 91 are the same as those in FIG. 3, 10 is an electromagnetic clutch, 11 is a reduction gear, and the driving force of each is transmitted to the work roll L2 via a spindle 12.13.

Since the roll drive device according to the present invention is configured as described above, it has the following effects.

(1) The circumferential speed of the upper and lower rolls can be changed arbitrarily.

(2) The diameter of the upper and lower rolls can be changed.

(3) When cutting the rolls, it is not necessary to make the diameters of the E lower rolls match, so it is economical.

(4) The spindle angle θ can be made smaller.

(5) Compared to the conventional one-sided drive, the other roll can be auxilially driven with a small amount of power, so rolling is reliable, and preliminary drive and acceleration/deceleration are easy, which is advantageous in terms of stability against jamming problems.

It exhibits extremely excellent effects.

[Brief explanation of drawings]

Figure 1 shows the drive system of a conventional hot strip mill, Figure 2 shows the conventional fin drive system, and Figure 3 shows the drive system of a conventional hot strip mill.
The figure is a schematic diagram of a drive device according to the present invention, and FIG. 4 is an explanatory diagram showing an example of a more practical device. 1... Upper work roll, 2... Lower work roll, 3
... Drive motor, 4... Drive shaft, 5... Pinion stand gear, 6... Upper work roll, 7...
Lower work roll, 8...Main drive motor, 9...-auxiliary MS motor, 10...Electromagnetic clutch, 11...Reducer, 12°13...Spindle.

Claims (1)

[Claims] 1. One work roll in a hot rolling mill is connected to a main drive motor that outputs most of the rolling power, and the other work roll is connected to a motor sufficient to pre-drive and accelerate/decelerate the roll. A roll drive device for a hot rolling mill, characterized in that it is connected to a small capacity auxiliary drive motor.