JPH04341548A - Device for driving roll in molten metal bath - Google Patents

Abstract

PURPOSE:To provide the device, which restrains whirling of a spindle, improves constant velocity property of revolution of a warp correcting roll and can reduce vibration of a plating device. CONSTITUTION:The device has couplings 26 fitted to the end part of the roll dipped into plating bath, a spindle 18 for transmitting rotating force of rotary driving mechanism to the roll in the bath, a pin joint member 19 fitted to the end part of this spindle 18 and connected by inserting plural pins into holes in the couplings 26 and springs arranged between the spindle 18 and the rotary driving mechanism and pressing the spindle toward the couplings, and recessed parts in the couplings 26 inserting the pin joint 19 is formed to tapered shape.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a roll in a molten metal bath that drives a roll immersed in a plating bath such as molten zinc.
related to a drive device.

0002

BACKGROUND OF THE INVENTION A plurality of rolls are immersed in a hot dip galvanizing bath in order to control the steel strip in the bath. A sink roll (in-bath deflector roll) is immersed in the deepest part of the bath, changes the traveling direction of the steel strip, and supports it in the bath. Stabilizing roll (pass line roll)
defines the pass line of the steel strip that is immersed just below the surface of the bath and rises from the bath. Further, a correcting roll (warpage correction roll) is provided between the pass line roll and the deflector roll, and corrects the warpage of the steel strip. The collecting roll is connected to a rotational drive mechanism and a pressing mechanism, supports the steel strip while being rotationally driven, and is pressed against the steel strip by the pressing mechanism.

As shown in FIGS. 6 and 7, one end (not shown) of a spindle 3 of a conventional drive device 2 is connected to a motor shaft (not shown) via a universal joint (not shown). ), while the other end of the spindle 3 is connected to a collecting roll 6 via a pin joint 4 and a coupling 5. The axis of the spindle 3 is inclined at a predetermined angle with respect to the axis of the roll 6.

The coupling 5 is rotatably supported by a bearing metal 7 on a holding member in the bath. Furthermore, the tip end 5a of the coupling 5 has an opening diameter and a bottom diameter that are the same (
It is formed to have a U-shaped cross section.

As shown in FIGS. 6 and 7, four pins 4
In order to rotate the spindle 3 with a in the bath, theoretically, the larger the angle of inclination of the axis of the spindle 3 with respect to the axis of the roll 6, the more the four pins 4a and the coupling tip 5a.
It becomes necessary to increase the gap (backlash) 9 between the hole and the hole. Similarly, the gap 8 between the coupling tip 5a and the pin joint 4 is also required.

[0006]

[Problems to be Solved by the Invention] However, in the conventional drive device, the gaps 8 and 9 are each several millimeters apart.
Since it is usually about 3 mm, the spindle 3 swings around a lot and the rotational speed of the collecting roll 6 becomes extremely uneven. Although such inconstant rotation of the roll 6 theoretically occurs in a universal joint on the bath, it is further amplified by the whirling of the spindle 3. When the rotation of the roll 6 becomes noticeable, the adhesion of zinc to the surface of the steel strip becomes uneven (uneven adhesion). Also,
If the gaps 8 and 9 are large, the impact that the pin 4a gives to the coupling tip 5a during rotation is large, and the life of the pin joint 4 and the coupling 5 is short. Furthermore, if the gaps 8 and 9 are large, the vibration of the plating equipment itself will increase, which will impede stable running of the steel strip and make the adhesion of zinc on the surface of the steel strip unstable and uneven.

[0007] This invention was made to solve the above problems, and it suppresses whirling of the spindle,
In addition to improving the uniformity of rotation of the warp correction roll,
An object of the present invention is to provide a molten metal bath roll drive device that can reduce vibrations of a plating device.

[0008]

[Means for Solving the Problems] A device for driving a roll in a molten metal bath according to the present invention includes a coupling attached to an end of a roll immersed in a plating bath, and a drive device for driving a roll in a molten metal bath.
a spindle that transmits the rotational force of the rotational drive mechanism to the spindle; a pin joint member that is attached to the tip of the spindle and connected by inserting a plurality of pins into the holes of the coupling; and the spindle and the rotational drive mechanism. a biasing mechanism provided between the two and pressing the spindle toward the coupling, and a recess in the coupling into which the pin joint enters is formed in a tapered shape. . In addition, the shoulder of the pin base of the pin joint member is
It is desirable that the shape be smooth and spherical.

[0009]

[Operation] In the molten metal bath roll drive device according to the present invention, although the spindle axis is inclined with respect to the roll axis, the shoulder of the pin base of the pin joint member is finished into a spherical surface, and the cup Since the recess of the ring is formed into a tapered shape, the pin joint member can easily fit into the coupling recess, and the biasing mechanism presses the spindle toward the coupling, so that the pin joint member and the coupling can easily fit together. The gaps formed between the two are kept to a minimum. Therefore, the pin joint member rotates smoothly within the coupling recess without substantially causing the spindle to swing around.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

A hot-dip galvanizing tank 43 is provided on the exit side of a continuous annealing furnace (not shown). The steel strip 42 is heated in a continuous annealing furnace and then immersed in molten zinc 44 in a bath. Further, an alloying furnace (not shown) is provided above the bath 43, so that the steel strip 42 pulled up from the bath is alloyed. As shown in FIG. 1, a sink roll 46 is immersed in the deepest part of the plating tank 43. The sink roll 46 is a holding member 4 outside the bath.
It is maintained by 5.

A stabilizing roll 30 is supported by a holding member 31 outside the bath, and is immersed above the sink roll 46 just below the hot water level. The stabilizing roll 30 is provided so as to define the pass line of the steel strip 42 rising from the bath 43. The rotation of this roll 30 is controlled by a drive device and a control device (not shown).

[0013] The collecting roll 20 is synchronized.
It is immersed in a position between the roll 46 and the stabilizing roll 30. The collecting roll 20 is held in the bath by a holding member 13 of the pressing mechanism 10 outside the bath. This holding member 13 is connected to a rod of an electric jack 12, and the electric jack 12 is connected to a control device (not shown).

FIG. 2 is a view of the collecting roll 20 and the drive device 50 viewed from a direction perpendicular to the axis. roll 20
One end thereof is connected to the spindle 18 via a joint portion 19. The spindle 18 is provided outside the bath, and its axis is inclined at a predetermined angle with respect to the axis of the roll 20. The angle of inclination of the spindle axis is in the range of 10-15°.

The other end of the spindle 18 is connected to a shaft 16 of a reduction gear 15 via a joint 17. Furthermore, the drive shaft of the motor 14 is connected to the reducer 15, and the motor
The rotational force of the motor 14 is transmitted to the reducer 15.

As shown in FIG. 3, the joint portion 17 of the spindle 18 is exposed outside the bath. On the other hand, the joint portion 19 is immersed in the bath. A universal joint member 21 of the external bath joint portion 17 is connected to a spline shaft 22 . The spline shaft 22 and the ends of the spindle 18 are housed in a spline sleeve 23. A spring 24 is inserted between the spline shaft 22 and the spindle 18. Note that the length from the universal joint member 21 to the pin joint member 25 is approximately 2 m60 cm.

As shown in FIG. 4, the coupling 26 includes:
The bearing metal 29 is attached to one end of the roll 20.
It is rotatably supported by the bath holding member 13 via. The tip end 26a of the coupling 26 has a U-shaped cross section and has a concave portion with a tapered inner wall. The pin joint member 25 in contact with the tapered inner wall of the recess has a spherical finish, and the spring 24 between the spline shaft 22 and the spindle 18 allows the pin joint member 25 to be fixed to the coupling tip 26a at a certain level. It is configured to rotate smoothly even when pressed with force.

As shown in FIG. 5, the pin joint member 25 has two pins 25a extending in the radial direction.
is inserted into the hole of the coupling tip 26a. The outer diameter of the main body of the pin joint member 25 is the same as that of the coupling tip 2.
It rotates in contact with the tapered inner wall of the recess 6a. That is,
A gap 27 between the pin joint member 25 and the coupling tip 26a is set to a minimum. The number of pins in the joint member 25 may be two or three, but two is most desirable.

Furthermore, the diameter of each pin 25a is slightly smaller than the diameter of the hole in the coupling tip 26a. Incidentally, the gap 28 between each pin 25a and the coupling tip 26a is
It is set to about 1 mm to several mm. Next, a case will be described in which the collecting roll 20 is rotated using the drive device 50 described above.

[0020] The steel strip 42 immersed in the bath is
When passing through the synchronized roller 46, it is deformed so as to be warped inward (towards the synchronized roller 46). While rotating the collecting roll 20, it is pushed into the steel strip 42 from the outside to correct the warpage of the steel strip 42. The pushing amount of the roll 20 is predetermined based on conditions such as the width, thickness, and tension of the steel strip 42.

The rotation speed of the motor 14 is controlled by a controller (not shown) based on the conveyance speed of the steel strip 42. The rotational force of the motor 14 is transmitted to the spindle 18 via a reduction gear 15 and a universal joint 17. The angular velocity ratio at this time is that the inclination angle of the spindle axis is 15
It varies within the range of 0.966 to 1.035 in the case of °. The rotational force is then transmitted from the spindle 18 to the roller 20 by the pin joint 19. At this time, the angular velocity ratio of the conventional pin joint is also 0.966 to 1.0.
It fluctuates within the range of 35, and the motor side shaft rotation and
The angular velocity ratio of the rotation is in the direction of adding up the individual angular velocity ratios, and eventually fluctuates in the range of 0.933 to 1.072. This adversely affected plating adhesion performance.

According to the two-pin joint of the above embodiment, the angular velocity fluctuations of the universal joint 17 and the pin joint 19 cancel each other out, and the rotational angular velocity of the roll 20 is controlled by the rotational angular velocity of the motor-side shaft 16. It is theoretically possible to set the value of the divided angular velocity ratio to 1, and the result of this example is also 0.9.
It was possible to suppress the variation within the range of 80 to 1.020. As a result, it was possible to suppress whirling of the spindle and reduce vibration of the plating equipment, and it was possible to uniformly deposit plating on the surface of the steel strip in a stable state.

In the above embodiment, a spring is used as the biasing mechanism, but the mechanism is not limited to this, and other means such as a compressed air cylinder may be used as long as the mechanism can obtain a soft pressing force. May be used.

[0024]

According to the present invention, it is possible to suppress whirling of the spindle and improve the uniformity of rotation of the warpage correction roll. Furthermore, vibration of the entire plating apparatus can be reduced. Therefore, the plating can be stably adhered to the surface of the steel strip, and uneven plating can be prevented.

Furthermore, since the gap (play) between the pin joint member at the tip of the spindle and the coupling is reduced,
The impact during rotation is reduced, extending the life of these components.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a molten metal bath roll drive device and a molten metal bath according to an embodiment of the present invention, viewed from the roll axis direction.

FIG. 2 is a schematic diagram of a molten metal bath roll drive device and a bath roll according to an embodiment of the present invention, viewed from a direction perpendicular to the roll axis.

FIG. 3 is a partial cross-sectional view schematically showing a spindle immersed in a plating bath.

FIG. 4 is a partial vertical sectional view showing a pin joint between the spindle and the coupling.

FIG. 5 is a cross-sectional view showing a portion of a pin joint.

FIG. 6 is a partial vertical sectional view of a conventional pin joint.

FIG. 7 is a cross-sectional view showing a portion of a conventional pin joint.

[Explanation of symbols]

Claims (1)

[Claims] 1. A coupling attached to the end of a roll immersed in a plating bath, a spindle for transmitting the rotational force of a rotational drive mechanism to the roll in the bath, and a coupling attached to the tip of the spindle. a pin joint member that is attached and connected by inserting a plurality of pins into holes of the coupling, and a biasing mechanism that is provided between the spindle and the rotational drive mechanism and presses the spindle toward the coupling; 2. A molten metal bath roll drive device, characterized in that a recess of the coupling into which the pin joint enters is formed in a tapered shape.