JP2600491Y2 - Driving device for roll in plating bath - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] The present invention relates to a driving device for a roll in a plating bath used in a continuous hot-dip galvanizing line and the like.
More particularly, the present invention relates to a device for preventing a spindle from transmitting a driving force from outside the bath to a roll in the bath, from bending.

[0002]

2. Description of the Related Art Conventionally, a roll in a bath of a plating apparatus widely used in a continuous hot-dip galvanizing line applies a rotational force to a roll 3 in a bath via a spindle 1 from outside the plating bath 2 as shown in FIG. A transmission method is used. And the drive equipment of the bath rolls 3, the plating bath 2 outside motors 4,
Transmission 5 and slide to facilitate connection of spindle 1 and bath roll 3 when incorporating bath roll 3 in the line
A shaft coupling 6, a power transmission shaft 7, a universal joint 8 and the like are installed. Further, one end of the spindle 1 is connected to the universal joint 8, and one end of the spindle 1 immersed in the plating bath is placed in a bath through a roll coupling 9. Connected to Roll 3. The connection between the roll coupling 9 and the spindle 1 is such that two or more pins attached to the tip of the spindle fit into grooves corresponding to the two or more pins provided in the length direction of the roll coupling, that is, in a bath. The structure is such that it can slide freely in the axial direction of the roll and the torque can be transmitted reliably. In addition,
The slide of the spindle 1 slides the slide base 13 which rotatably supports the power transmission shaft 7 on the fixed frame 14 by driving the screw shaft 12 by the air motor 11.

[0003] Incidentally, a plating apparatus, in particular, a roll in a bath, a roll supporting member in a bath, a spindle, and the like are installed in a hot molten zinc bath. Therefore, since a considerably large thermal expansion occurs, the connection between the roll coupling and the spindle is attached in advance in consideration of the expansion allowance of the roll and the like. In addition, the axial direction of the roll in the bath (thrust)
The fixing is also set to be very loose, and since the members wear almost in proportion to the plating work time, the displacement amount in the roll axis direction (due to elongation due to thermal expansion and abrasion of the thrust receiving member) is large. Has become.

As described above, the amount of displacement in the roll axis direction (depending on elongation allowance and backlash) includes many uncertain factors, and when the plating is displaced more than expected during the plating operation, a compressive load is generated on the spindle. There is. If an excessive axial compressive load is applied to the spindle, the spindle will bend. As described above, the degree of engagement between the roll coupling and the spindle tip changes from moment to moment, and therefore, the roll coupling often hits the spindle tip during plating. At this time, there is a problem that an axial compressive force is generated in the spindle, so that the spindle is bent.

On the other hand, since the roll-in-bath bearing is installed in a molten zinc bath, a plain bearing has been conventionally used because of its necessity to withstand high temperature and erosion. Due to the structure of this slide bearing, the fit between the roll shaft and the bearing is loose and a gap of about several mm is provided. It is well known that the clearance between these bearings increases substantially in proportion to the plating operation time.

[0006] The bending of the spindle and the play of the roll bearing are combined, and the roll in the bath is forced to rotate while changing its center of rotation, so that the strip withdrawn from the plating bath undergoes periodic vibration, There is a problem that the distance between the wiping nozzle and the strip at the wiping point is periodically changed to cause unevenness in the amount of deposited zinc.

[0007]

As described above, there is a problem that the spindle is bent by the axial compression load applied to the spindle. If the spindle bends, the roller in the bath being driven is rotated using a sliding bearing with a backlash because the bearing of the roller in the bath to be driven is used. Therefore, the distance between the wiping nozzle and the strip periodically fluctuates at the wiping point on the plating bath because the strips withdrawn from the plating bath vibrate, resulting in uneven wiping force and adhesion of the plating. There is a problem that the amount is not uniform.

[0008] An object of the present invention is to propose a drive device for a roll in a plating bath in which bending of a spindle is prevented, which can reduce such a problem.

[0009]

SUMMARY OF THE INVENTION The present invention provides a driving apparatus for a roll in a plating bath of a continuous hot-dip metal plating line.
A pedestal 17 fixed to a slide base 13 is provided by penetrating a power transmission shaft 7 for transmitting a rotational force to a spindle 1 for driving a roll 3 in a plating bath from a driving device 10 outside the plating bath. A spring 19 compressed by a predetermined force as a cushion member is mounted between the frame and a ring 18 attached to the power transmission shaft 7 on the universal joint 8 side of the universal joint 8 in a non-contact manner. 18 or rotatable between the stepped portion 21 provided on the power transmission shaft 7 of the universal joint side than congregate power transmitting shaft
A driving device for a roll in a plating bath, wherein a bearing 20 capable of causing the displacement of the spring 19 to act on the spring 19 via a ring 18 is attached.

[0010]

According to the present invention, by incorporating a displaceable cushion axial force direction of the power transduction shank Niso that concatenates the spindle (spring), it occurs more than a predetermined elongation to the spindle <br/> Then, the spring is compressed, so that an excessive axial compressive load is not applied to the spindle, and the spindle does not have a problem such as bending. In the present invention, the gantry 17 and the power transmission
With a predetermined force between the shaft 7 and the ring 18 attached in a non-contact manner
A compressed spring 19 is attached, and the ring 18 and power
The bearing 20 is mounted between the stepped portions 21 provided on the transmission shaft 7.
By this, it is stepped by the force of the spring 19 compressed by the predetermined force
Since the part 21 is pressed against the support bearing 15, the force is less than a predetermined force.
The power transmission shaft 7 is prevented from sliding.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 shows the axial compression force absorbing device 16 of the present invention incorporated between the power transmission shaft 7 on the slide base 13 and the support bearing 15. The gantry 17 is fixed to the slide base 13 through the power transmission shaft 7, and a ring 18 is attached to the universal joint 8 side of the gantry 17 in a non-contact manner with the power transmission shaft 7. Between them, a spring 19 as a cushion member is mounted. A bearing (here, a thrust bearing) which is rotatable between the ring 18 and a stepped portion 21 provided on the power transmission shaft 7 and which allows the displacement from the universal joint 8 side to act on the spring 19 via the ring 18 Use bearings)
20 are installed.

[0012] The change of direction in the figure to the spindle 1 arrow here
Position displacement is A occurs Ru is displaced via the universal joint 8 power transduction axis 7 in the direction of arrow B. Then the bearing
20, the spring 19 is displaced in the direction of arrow B via the ring 18,
The spring 19 is compressed and deformed according to the displacement . Since the base 17 is fixed to the slide base 13, the position is maintained, and the power transmission shaft 7 slides to the left in the drawing by the amount of compressive deformation of the spring 19, and the displacement is controlled by the slide type joint 6. Absorbed.

[0013] The strength of the spring 19 is required to be hardly compressed when fitting the spindle 1 in the roll coupling 9, also like to absorb excessive elongation shrinks when the excessive elongation occurs in the spindle 1 Must be selected.

[0014]

The following effects can be obtained by using the apparatus for driving a roll in a plating bath of the present invention. (1) Since the spindle does not bend, no vibration is generated in the strip rising from the plating bath, so that stable wiping at the wiping point is possible, and a high-quality plated product can be stably manufactured. . (2) Since the spindle does not bend, the cost and time for replacing the spindle can be saved, and the productivity and maintenance cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional typical roll driving device in a plating bath.

FIG. 2 is an explanatory view of a roll driving device in a plating bath incorporating the present invention.

[Explanation of symbols]

1 spindle 2 plating bath 3 bath roll 4 motor 5 transmission 6 sliding shaft coupling 7 power transduction shaft 8 universal joint 9 roll coupling 10 driving unit 11 the air motor 12 screw shaft 13 slide base 14 fixed frame 15 bearing 16 axial compression Force absorber 17 Mount 18 Ring 19 Spring 20 Bearing 21 Stepped part

Claims (1)

(57) [Scope of request for utility model registration] 1. A driving device for a roll in a plating bath of a continuous molten metal plating line, wherein a drive unit 10 outside the plating bath penetrates a power transmission shaft 7 for transmitting a rotational force to a spindle 1 for driving a roll 3 in the plating bath. is allowed to stand 17 fixed to the slide base 13 provided, with the platform 17, the ring was attached to the non-contact power transmission shaft 7 of the universal joint 8 side from the frame 18
A spring 19 compressed by a predetermined force as a cushion member is mounted between the ring 18 and the ring 18 and the stepped portion 21 provided on the power transmission shaft 7 on the universal joint side from the ring 18. rotatable in either congregate force drives the plating bath rolls, characterized in that fitted with bearings 20 which can act displacement of the transmission shaft to the spring 19 via the ring 18 between.