JP3391580B2 - Roll shaft support device in molten metal plating bath - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll shaft supporting device in a molten metal plating bath, and more particularly to a roll shaft supporting device for rotatably supporting a roll immersed in a molten metal plating bath.

[0002]

2. Description of the Related Art Conventionally, a plating apparatus for a continuous hot-dip galvanizing line, as shown in FIG. 7, continuously passes a strip 1 in a molten metal plating bath 2 so that a sink roll 3 and a strip 1 can be positioned. Support rolls 4a, 4b and the like for the purpose of shape control are arranged, and a slide bearing is used as a bearing of such roll.

The bearing 5 shown in FIGS. 8 and 9 is an example applied to the in-bath support rolls 4a and 4b. It has a structure in which the roll shaft 6 is supported by a cylindrical bearing 5, and the sliding contact portion of the roll shaft 6 with the bearing 5 is made of a material that is durable against corrosion of molten metal and has wear resistance. The attached ring 7 is attached. On the other hand, in the sliding contact portion of the bearing 5 with the roll shaft 6, similarly to the roll shaft 6, a ring 8 made of a material having durability against corrosion of molten metal and having wear resistance is formed into a cylindrical shape. The bearing 5 is attached to the inner surface of the bearing 5, and the bearing 5 includes the arm 9 and the fixing bracket 10.
It is fixedly supported by the arm 9. One of the bearings 5 has a flange shape so as to support the thrust load.

By the way, the fit between the shaft and the bearing is such that the roll can be smoothly rotatably supported in a high temperature environment in the molten metal.
It usually has a large gap, and aims at smooth roll rotation by making it easier to introduce molten metal and using it as a lubricant. It is well known that this gap wears and grows in proportion to the plating work time.

If there is a gap between the fitting portion of the bearing and the shaft as described above, the roll is supported while rolling inside the bearing, so that it becomes difficult to rotate about a certain position, and as a result, the strip is stripped. It will give vibration. When the strip vibrates, as shown in FIG. 7, the wiping nozzles 11a, 11 arranged to face the strip 1 on the plating bath are provided.
Since the distance between b and the strip 1 cannot be kept constant, it is not possible to control to a uniform predetermined plating thickness,
Therefore, there is a problem that the plating quality is deteriorated.

On the other hand, the life of the bath roll is almost always due to the limit of use of the bearing caused by the progress of wear of the bearing, and many measures have been taken so far for the purpose of extending the life. Came. For example, Japanese Utility Model Laid-Open No. 57-125768, "Sink Roll Bearing," discloses a technique in which the cross-sectional shape of the contact portion with the shaft is opened downward in a V shape and the bearing hardness of the contact portion is made higher than that of the shaft. ing. However, the backlash between the bearing and the shaft is large, and the vibration of the roll cannot be suppressed quickly. The reality is that there is none.

[0007]

Roll bearings that are immersed in a molten metal plating bath must be able to withstand the erosion of molten metal and must be durable in a high temperature environment. Therefore, sliding bearings have been conventionally used. However, since the slide bearing uses molten metal as a lubricant, it is necessary to make a large gap between the bearing and the shaft.

However, if the roll in the bath, particularly the support roll bearing for controlling the rising position of the strip has a backlash, the center of rotation of the roll rotates while fluctuating, which gives vibration to the strip. There is a problem that the gap between the wiping nozzle and the strip cannot be kept constant, and as a result, the uniform plating thickness cannot be controlled, resulting in deterioration of the plating quality.

[0009]

The present invention was developed in order to eliminate the gap between the roll shaft and the bearing as quickly as possible without impairing the rotation of the roll, and it is immersed in a continuous molten metal plating bath. In the shaft support device of the roll to be arranged,
The outer diameter surfaces of both ends of the roll shaft are tapered in different directions from each other, and the bearings to be fitted on the outer surfaces of the roll shaft are formed such that their inner surfaces are fitted to the taper and are movable in the roll shaft direction. It is a roll shaft supporting device in a molten metal plating bath which is a feature.

Another aspect of the present invention is a roll shaft supporting device which is immersed in a continuous molten metal plating bath, wherein one end of the roll shaft has an outer diameter surface of the roll shaft and the other end side of the roll shaft. A bearing with a large-diameter axial taper is fitted on the inside so that the inner surface fits with the taper and is movable in the roll axis direction. A roll shaft supporting device in a molten metal plating bath, characterized in that a conical concave part is provided and a conical convex part supporting part fitted into the concave part is provided.

[0011]

The present invention eliminates the gap between the roll shaft and the supporting portion by moving the bearing box in the axial direction, thereby preventing the vibration of the strip caused by the contact with the roll caused by the looseness of the bearing portion. Further, in the second invention, one shaft has a cylindrical taper, and the other shaft has a conical recess at the shaft end so that the support portion is formed therein, and thrust is constantly applied to support the support portion. I chose

[0012]

【Example】

Example-1 An example of the in-bath roll shaft support device of the present invention will be specifically described below with reference to the drawings. FIG. 1 schematically shows the roll shaft support device of the present invention, in which the taper ring 12 fixed to the roll shaft 6 and the taper ring 13 of the bearing 5 are tapered to have the same gradient, By sliding the bearing 5 in the direction of arrow A, the tapered ring 12 of the roll shaft 6 and the tapered ring 13 of the bearing 5
Are configured so that they can be contacted with almost no gap.

2 and 3 illustrate a bearing moving mechanism. Bracket 1 fixed to frame 21
4 in the bath Spline shaft 1 parallel to the length direction of roll 4b
5 is attached rotatably. The arm 9 (9a, whose lower end is immersed in the plating bath 2 at the portion of the spline 24,
Install 9b). The spline shaft 15 is connected to a motor 18 via a shaft joint 17, and by rotating the spline shaft 15, the horizontal position of the roll 4b in the bath can be changed. By this mechanism, the strip 1 rises from the plating bath 2 The position can be controlled.

The arms 9a and 9b are respectively passed through threaded screw shafts 16 in opposite directions, one end of which is connected to a motor 20 through a transmission shaft 19 with a universal joint that is expandable and contractible. By rotating the motor 20, the arms 9a and 9b can be slid in the directions of arrows A and B, respectively. Here, the arms 9a, 9 of the screw shaft 16
The reason why the screw direction of the attachment portion of b is reversed is that the arms 9a and 9b are simultaneously actuated in the A direction (or B direction) by one drive source. Further, the transmission shaft 19 with a universal joint that is expandable and contractible for driving the screw shaft 16 is interposed so that the screw shaft 1 can be changed when the horizontal position of the roll 4b is changed.
Since the connection angle between the motor 6 and the motor 20 and the distance between the motor 6 and the motor 20 fluctuate, these are used in order to absorb these changes.

On the other hand, the rotation of the roll 4b is driven by a spindle 22 from a driving device (not shown) outside the bath through a universal joint 23 in the bath. The movement amount of the arms 9a, 9b (bearing 5) in the A direction or the B direction is set so that the ring 12 of the roll shaft 6 and the bearing ring 13 have almost no gap and the roll 4b can smoothly rotate. , The load (current value) of the motor that rotationally drives the roll 4b is detected and set based on the detected value.

FIG. 4 shows an application example of the shaft supporting device of the present invention, which has a structure in which the tapered ring of the bearing supporting portion described so far is attached in the opposite direction, and the wear increases with the plating operation. The direction in which the amount (play) is reduced, that is, the bearing sliding direction is indicated by arrow B. Example-2 The in-bath roll shaft support device of Example-2 will be specifically described below with reference to the drawings.

FIG. 5 schematically shows a roll shaft supporting device of an embodiment different from that of the embodiment 1, in which one of the bearings (first bearing) 32 is rolled on an extension line of the roll rotation center. The conical shaft 34 is fixed parallel to the shaft, and the shaft 34
Then, the conical recess 36 provided at the end 35 of the roll shaft 6 is pushed in and supported. The other bearing 33 (second bearing) is tapered in the same gradient so that the tapered ring 37 fixed to the roll shaft 6 and the tapered ring 38 of the bearing 5 fit each other, and the bearing 5 in the direction of arrow D. By sliding the rolls 4a and 4b, the rolls 4a and 4b are pushed into the first bearing 32 side so that they can make sliding contact without a gap, and the tapered ring 37 of the roll shaft 6 and the tapered ring 38 of the bearing 5 slide with little gap. It is configured to be accessible.

FIG. 6 illustrates the sliding mechanism of the second bearing 33, which includes the bracket 3 fixed to the frame 41.
9, the arm support shaft 5 parallel to the length direction of the roll 4b in the bath
Attach 0 rotatably. An arm 45 having a conical shaft 34 forming the first bearing 32 at its tip is attached to the arm support shaft 50 by a key 46 on the arm support shaft 50.
The arm 45 uses a spacer 47 and the like to support the arm support shaft 50.
Although it is fixed in the axial direction, it is mounted so that it can be swung following the rotation of the arm support shaft 50. The second bearing 33 is attached to the lower end of an arm 54 connected by a spline 42 of the arm support shaft 50. The lower end of the arm 54 has the bearing 33 immersed in the plating bath 2 and the arm support shaft 50.
It is held so that it can move in the axial direction.

The arm support shaft 50 is connected to the motor 44 via the shaft joint 43, and by rotating the arm support shaft 50, the horizontal position of the roll 4b in the bath can be changed. The rising position from the plating bath 2 can be adjusted. Further, a screw is attached through the arm 54 so that the arm 54 can be moved in the D direction, and one of the screw shafts 48 is fixed with a key 49 so that one of the screw shafts 48 can follow the rotation of the arm support shaft 50. Supported by. The other is connected to a motor 51 via a transmission shaft 50 with an expandable joint that is expandable and contractable, and by rotating the screw shaft 48 by the motor 51, the arm 54 can be moved in the D direction. Further, the transmission shaft 50 with a universal joint that is capable of expanding and contracting to drive the screw shaft 48 is interposed because when the horizontal position of the roll 4b is changed, the connection angle between the screw shaft 48 and the motor 51 and the distance thereof change. The amount of change can be absorbed.

On the other hand, the rotation of the roll 4b is driven by a spindle 53 through a universal joint 52 in the bath from a driving device (not shown) outside the bath. The amount of movement of the arm 54 (second bearing 33) is set so that there is almost no gap between the ring 37 of the roll shaft 6 and the bearing ring 38, and the roll 4b.
In order to bring the roll 4b into a smoothly rotating state, the load (current value) of the motor that rotationally drives the roll 4b is detected and set based on the detected value.

[0021]

The following effects can be obtained by using the in-bath roll shaft support device of the present invention. (1) It is possible to prevent the occurrence of flaws on the strip due to the uneven rotation of the roll in the plating bath, and it is possible to stably produce a high-quality plated product. (2) By measuring the amount of movement of the bearing housing required to reduce the bearing clearance, it is possible to grasp the amount of wear of the bearing even during plating work, and the plating equipment can be used continuously until the bearing life limit. Therefore, it is possible to reduce the interruption of plating work for replacing the plating apparatus, improve productivity, and reduce maintenance costs.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a roll bearing in a bath according to an embodiment.

FIG. 2 is an explanatory view of a sliding mechanism of the bearing of the embodiment.

FIG. 3 is an explanatory view of a sliding mechanism of the bearing of the embodiment.

FIG. 4 is an application example of the embodiment.

FIG. 5 is an explanatory view of the in-bath roll bearing of the embodiment.

FIG. 6 is an explanatory view of a sliding mechanism of the bearing of the embodiment.

FIG. 7 is an explanatory view of a conventional typical plating apparatus.

FIG. 8 is a side view showing an example of a conventional typical in-bath support roll support bearing.

FIG. 9 is a cross-sectional view of a conventional typical in-bath support roll support bearing.

[Explanation of symbols]

1 Strip 2 Plating Bath 3 Sink Roll 4a, 4b Bath Support Roll 5 Bearing 6 Roll Shaft 7 Ring 8 Ring 9 Arm 10 Fixed Bracket 11a, b Wiping Nozzle 12 Ring 13 Ring 14 Bracket 15 Spline Shaft 16 Screw Shaft 17 Shaft Coupling 18 Motor 19 Transmission shaft 20 Motor 21 Frame 22 Spindle 23 Universal joint 24 Spline 32 Bearing 33 Bearing 34 Shaft 35 End 36 Recess 37 Ring 38 Ring 39 Plaquette 41 Frame 42 Spline 43 Motor 45 arm 46 Key 47 Spacer 48 Screw shaft 49 Lever 50 Support shaft 51 Motor 52 Universal joint 53 Spindle 54 Arm

Continuation of the front page (56) References JP-A-3-277753 (JP, A) JP-A-3-166353 (JP, A) JP-A-3-140615 (JP, A) Actual development Sho 55-54615 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) C23C 2/00-2/40 F16C 13/00-15/00

Claims (2)

(57) [Claims] 1. A roll shaft support device immersed in a continuous molten metal plating bath, wherein the outer diameter surfaces of both ends of the roll shaft are tapered in different directions, and An apparatus for supporting a roll shaft in a molten metal plating bath, characterized in that each of the inner surfaces has a shape fitted with the taper and is movable in the roll shaft direction. 2. A shaft supporting device for a roll immersed in a continuous molten metal plating bath, wherein one end of the roll shaft has an outer diameter surface of the roll shaft and the other end of the roll shaft has a large-diameter axial taper. The bearing to be externally fitted to this has an inner surface that fits with the taper and is formed so as to be movable in the roll axis direction, and a conical recess is provided at the other end of the roll shaft at the roll shaft end. A roll shaft supporting device in a molten metal plating bath, characterized in that a conical convex supporting part fitted into the concave part is provided.