JPH03219061A - Molten zinc plating equiepment - Google Patents

Abstract

PURPOSE:To easily enable forced driving of a roll in bath and to prevent scratch occurring on a steel strip to be plated by restraining vibration generated to the steel strip whose direction is changed with the roll in the bath by a straightener roll and driving both rolls with motors outside of the bath. CONSTITUTION:The steel strip 1 to be plated is drawn in the molten zinc bath 2 in a bath vessel 9 and its direction is changed with the roll 11 in the bath dipped at shallow position. Further, this is drawn up in vertical direction through the straightener roll 12 set opposite to the roll 11 in the bath sandwiching the steel strip 1 between them. The straightener roll 12 corrects warp in the width direction generated in the steel strip 1 to be plated and further, flow of the molten zinc attached with the surface of steel strip 1, is prevented. The roll 11 in the bath is driven and rotated so that the periphral velocity becomes the same velocity as the passing-through velocity of strip with driving of the motor 15 outside of the bath through a universal joint 13. The straightener roll 12 is rotated with the motors 16 through a universal joint 14.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to hot-dip galvanizing equipment, and more specifically to hot-dip galvanizing equipment in which a roll in a bath provided in a hot-dip zinc bath is forcibly driven. It is related to.

<Prior Art> Conventionally, when hot-dip galvanizing is applied continuously to a strip-shaped steel plate, the steel plate 1 to be plated is first placed in a bathtub 9 as shown in FIGS. 13 and 14. 8 After being drawn into the dipped zinc bath 2, it is rotated in the 'C direction by rolls 3 in the bath, and further, a pair of support rolls 4 arranged facing each other suppress the vibrations and width of the steel plate 1 to be plated. While correcting the warpage in the direction, the molten zinc is pulled in the vertical direction, and the surplus of the molten zinc that adheres to the surface of the steel plate l and flows in the direction of ζ-L is removed by a pair of opposing wiping devices installed above the bath. 1 sprayed from nozzle 5
The required plating film 11 is blown off with r11 pressure gas.
Equipment that increases f1 to 1 is used.

In such equipment, the bath roll 3 has its body 3
It is essential for the strips 1/1 to rotate at a smooth constant speed to prevent relative slippage between a and the steel plate to be plated I, but contrary to expectations, these often do not rotate smoothly. Otherwise, slippage may occur between the plated steel plate 1 and the plated surface, causing scratches on the plated surface and significantly deteriorating the quality.

In this equipment, the bath roll 3 is rotatably supported by cylindrical sliding bearings 6 that fit into the roll shaft 3 b provided at both ends, and the roll shaft 3 b and the sliding bearing 6 are connected to each other. The sliding surface between them is lubricated by the molten zinc bath 2 filled in the bathtub 9. This bath roll 3 is located deep in the bath below the pair of board rolls 4 due to locational constraints, has a 71'U colander, and has a molten zinc bath of 1 near 1 audience. Since it is completely immersed in the plated steel plate 2, it is practically difficult to forcibly drive it to rotate with an external prime mover. The reality is that we have no choice but to do so.

In this way, the roll 3 in the bath uses the sliding bearing 6 that relies on the lubricating action of the t8 dipped zinc, and also expects a driven rotation that follows the movement of the steel plate l to be plated. The roll 3 in the bath becomes difficult to rotate due to an abnormal increase in frictional force due to wear and foreign matter contained in a large amount in the molten zinc bath 2 being trapped in the sliding surface. Slippage may occur between the plated steel plate 1 and the body 3a of the bath roll 3, causing scratches on the surface of the plated steel plate 1, or in severe cases, the bath roll 3 may become unable to rotate, resulting in a loss of operation. It may even become a serious situation.

Also, it is plated! R tentative! If the sheet passing speed increases to several im/min or more, the plated w4Fi+ and the 11
- Between body parts 3 and 1 of rule 3? 'a The galvanized steel sheet 1 is pulled into the bath, and as a result, the steel sheet 1 to be plated is partially lifted from the body 3a of the bath roll 3, and the sliding bearing is transferred from the steel sheet 1 to be plated to the roll 3 in the bath. Due to the large frictional force of 6, sufficient rotational force was not transmitted to the bladder, and as a result, 11-
The movement of the body 3a of the steel plate 3 does not move at the same speed as the movement of the steel plate 1 to be plated, and slippage occurs between them, resulting in scratches on the surface of the steel plate I to be plated.

A system for driving one call in the bath to match the speed of the steel plate; 6, published in Japanese Utility Model Publication No. 55 5797') states that in the bath "a first row of protrusions planted concentrically with the l-ru at equal pitches, and a first row of protrusions at the lower end. A rotary rod having a second row of protrusions installed in an annular manner with a 1-pitch meshing with the first row of protrusions and extending upward from the surface of the molten zinc bath, and a prime mover that applies rotational torque to the rotary rod, rotate the bath. A device is disclosed in which the middle roll is rotationally driven.However, this device engages and engages the first row of projections and the second row of projections in a bath.
As a result, early erosion of the transmission mechanism members is unavoidable, and the accuracy of the rolls in the bath decreases due to the play caused by erosion.
l drive becomes 14 de 1.

Furthermore, in Japanese Utility Model Publication No. 60-386611, a prime mover for a 1'J-le in the bath is provided outside the bath, and the 1'J-le in the bath and the prime mover outside the bath are connected by a power transmission device such as a chino. It has been disclosed that a heat insulating cover with a heater is provided next to the power transmission a to prevent coagulation of deposited zinc pulled up from the hot-dip galvanizing bath. This device also cannot avoid premature erosion of the power transmission mechanism members, which not only makes it difficult to synchronously drive the l'-le in the bath, but also requires a cover with a heater in addition to the power transmission mechanism, making the structure difficult. j[It has the drawbacks of being complicated, increasing equipment costs, and being prone to breakdowns.

Although many attempts have been made to replace the sliding bearings 6 with rolling bearings in order to allow the bath rolls 3 to rotate easily, it is difficult to put them into practical use due to the loss of life and reliability. The reality is that this has not yet been achieved. As a last resort to solve these problems, up until now, the entire length of the body 3a of the bath roll 3 in the longitudinal direction was 20 mm at a pitch of about 50 mm.
Carve a groove about the width of the line in the circumferential direction and coat the plated steel with 4Fi
The molten zinc drawn in by the movement of roll 1 and roll 1 in the bath passes through this groove and can be easily discharged from the surface. Although measures are taken to prevent the groove from floating away from the portion 3a, sometimes the shape of this groove is transferred to the surface of the steel plate l to be plated, causing problems such as deterioration of the quality of the plated surface.

In addition, the support rolls 4 are used to tighten the paired support rolls 4 together in order to prevent stable wiping and uneven plating thickness due to shaking of the steel plate 1 to be plated. It is also used for the important purpose of correcting the warpage in the width direction of the steel plate to be plated by inserting the steel plate (for example, in Japanese Patent Publication No. 57-53
(Refer to Japanese Patent No. 856), these can be arranged at a relatively shallow position in the molten zinc bath 2, so the universal joint 7a,
It is rotatably driven by a prime mover 8 placed on the ground via a universal joint 7 consisting of an intermediate shaft 7b and a universal joint 7c. Therefore, unlike the roll 3 in the bath, the rotation speed of the body of the support roll 4 is
can be adjusted for speed.

<Problems to be Solved by the Invention> The present invention has been made in order to solve the problems caused by the bath roll of the prior art described above, and the bath roll is rotationally driven by a simple structure of transmission R. The purpose of this project is to provide hot-dip galvanizing equipment that can perform the following steps.

<Means for Solving the Problems> The present invention for achieving the above-mentioned object is directed to a method in which, in a plating equipment that continuously hot-dip galvanizes a strip-shaped steel plate, a steel plate to be plated drawn into a molten zinc bath is directed upwardly. A bath r1-rule for changing the direction and adjusting the position back and forth to eliminate warpage in the width direction of the steel plate, and for suppressing vibrations generated in the steel plate to be plated whose direction has been changed and keeping the pass position constant. The steel plate to be plated is sandwiched between the rolls in the bath 1.
and straightening rolls arranged to face each other in a molten zinc bath at a position higher than the axis of the 111-rule, and both the roll in the bath and the straightening roll or only the roll in the bath have a universal joint. It is characterized by being configured to be rotationally driven by a prime mover installed outside the bath via the bath. It is preferable that the top ends of the bodies of the rolls in the bath and the straightening rolls are immersed below the surface of the molten bath for a distance of 50 m or more and 200 m or less.

Furthermore, as a universal cylinder joint, one shaft of the universal joint has a spherical body provided at the tip of the one shaft, and two shafts that protrude symmetrically onto the spherical part of the spherical body. a coupling head, the other shaft being provided at the tip of the other shaft, a cavity provided inside the coupling head, and a coupling head provided symmetrically around the outer periphery of the coupling head. and two notched grooves communicating with the hollow part, the spherical part of the spherical body is formed symmetrically with respect to the axis of the one shaft, and the two pins are arranged symmetrically with the axis of the one shaft. It is on a straight line orthogonal to
and in the coupling head, the axis of the coupling head is on the axis of the other shaft, and the two notch grooves are formed symmetrically with the axis of the other shaft, and n
ii. The spherical body provided at the tip of one shaft fits into the cavity of the coupling head provided at the tip of the other shaft, and the two pins fit into the two notched grooves. It is preferable that the rotating forces of the one shaft and the other shaft can be transmitted to each other.

Function: Since the steel sheet to be plated is held between the rolls in the bath and the straightening rolls are placed facing each other in the molten zinc bath at a position higher than the axis of the bath, The molten zinc bath can be placed shallowly in the molten zinc bath. As a result, the roll in the bath can be rotationally driven by a prime mover installed outside the bath via the universal gear.

In this way, each time the bath 1+-ru is rotated in synchronization with the steel plate, slippage between the body of the bath 11-ru and the steel plate is prevented, and good plating without scratches can be applied to the steel plate.

It is preferable that the depth below the bath surface of the bath J-roll and straightening roll be 50 mm or more and 200 mm or less, because if it is less than 50 mm, it will cause the bath surface to be disturbed, and when the bath surface changes, the roll This is because the top may be exposed to the bath surface. On the other hand, if the depth below the bath surface exceeds 200M, disadvantages such as the length of the drive shaft of the universal diagonal will increase.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 and FIG. 2 are a side sectional view and a front view, respectively, showing an embodiment of the present invention. 1 and 2, 10 is a plating equipment according to the present invention, and a steel plate l
After being drawn into the molten zinc bath 2, the direction of the molten zinc is changed by the rolls 11 in the bath, and the surplus of the molten zinc that has adhered to the steel plate 1 is transferred to a pair of wiping nozzles 5 provided in the bath 2. The operations such as blowing off the water are the same as those shown in FIGS. 13 and 14.

The plating equipment IO according to the present invention includes a bath roll 11, a middle straightening roll 12, a universal joint 13 and a bath roll 11.
4. The prime mover [Consists of main elements such as 15 and 16.

The roll 11 in the bath changes the direction of the steel sheet 1 to be plated, which has not been drawn into the hot-dip zinc bath 2, into the direction of direct force, and also generates an IJ convergence on the wave-plated steel sheet l. It is for adjusting the correction of warpage in the direction, and has a diameter of 500 to 900 mm.A broken plated steel plate l is wound around the body 11a of the bath roll 11 at an angle of about 150°. In addition, this in-bath roll 11 prevents the top end of the body portion 11a from being exposed above the surface of the T8 dipped zinc bath 2, or the surface of the molten TiTi lead bath 2 being strongly agitated. In order to prevent the metal from sinking and to sink to the minimum depth, the multilayer is arranged so that its top end is approximately 100 to 200 cm below the surface of the molten zinc bath 2.

Roll shafts 11 b LJ at both ends of the roll 11 in the bath
If? installed at the lower end of the bath roll hanger 17? The bath roll 11 is rotatably supported by a bearing 18, and the bath roll 11 is connected to a prime mover 15 located on the ground via a universal joint 3 consisting of a universal joint 13a, an intermediate shaft 13b, and a universal joint 13c. Transmission connected. The prime mover 15 is for rotationally driving so that the circumferential speed of the body part IIa of the bath roll 11 is approximately the same as the passing speed of the steel plate l to be plated. This is for suspending and supporting the middle 1-le IH+11-1, which is supported by the frame J, 20 which is fixed to the ground by a pin 19 so as to be freely movable in mm. The upper end of the 11-rule hanger 17 is transmission-connected to a telescopic drive actuator 21 that is mounted and fixed on a frame 20, and the position of 1-2-ru II in the bath is changed in the left-right direction in FIG. (
It is designed to be adjusted in the front-rear direction (as shown in Fig. 2).

On the other hand, the straightening rolls 12 sandwich the steel plate 1 to be plated and
1-It is disposed on the opposite side of the position higher than the axis of the roll 11, and the top end of the body 12a of the bath roll 1IIi''i1 is exposed above the surface of the molten zinc bath 2. In order to prevent the surface of the molten zinc bath 2 from being strongly stirred and to submerge it to a minimum level, the top of the body of the tY channel is placed approximately 100 to 200 m below the surface of the molten zinc bath 20. The l'l-roll shafts 12b at both ends of the straightening roll 12 slide toward the lower end of a straightening roll hanger 23 suspended from a frame 22 fixed on the ground. The straightening roll 12 is rotatably supported by a bearing 24, and the straightening roll 12 is supported by a universal joint 14.
a, a universal joint I4 consisting of an intermediate shaft 14b and a universal joint 14c, and is transmission connected to a prime mover 16 located on the ground. The prime mover 16 rotates and drives the straightening roll I2 so that the circumferential speed of the body 12a becomes approximately the same speed as the passing speed of the sheet to be plated.

The purpose of the straightening roll 12 is to maintain the rising position of the steel plate I to be plated, that is, the bath position, and to hold the steel plate 1 to be plated in the bath by the U-rule 11 (opposite in the direction of bending). By bending back in the direction, the purpose is to correct the warping in the width direction that occurred in the plated t12I plate 1 when passing through the bath 11-1, and also to bend the molten zinc brought to the surface of the plated steel plate 1. It is used for the purpose of preventing the flow of molten zinc on the front and back surfaces of the steel plate 10 to be plated, and creating an almost fi1-like molten zinc flow condition, and the diameter of the body 12a is usually about 150 to 400 mm. selected.

With the above configuration, i! In the case of continuous hot-dip galvanizing, as shown in Figs. Bath roll 11
The direction is changed by 1, and the steel plate 1 is pulled up in the vertical direction through the middle straightening roll 12, which is placed opposite to the bath roll 11 with the steel plate 1 in between, and the steel plate 1 adheres to the surface of the steel plate 1 and rises. The excess molten zinc is blown off by high-pressure gas injected from a pair of manopping nozzles 5 provided above the bath to achieve the desired plating thickness (J: J: Gero).

At this time, the roll 11 in the bath is driven by the prime mover 15 to connect the roll shaft 1 through the universal joint 13, that is, the universal joint 13C1, the intermediate shaft 13b, and the universal joint 13a.
Together with 1b, the body 11a of the bath roll 11 is rotationally driven so that the circumferential speed is the same as the passing speed of the steel plate 1 to be plated. Similarly, the arrogant Ij-ru 12 is driven by the driving force alG to drive the universal joint 14, that is, the universal joint 1.
4c, the peripheral speed of the body 12a of the straightening 1 call 12 is applied via the intermediate shaft 14b and the universal joint 14c, and the steel plate l
It is rotated at the same speed as the sheet threading speed.

Further, the bath roll 11 suspended and supported by the bath hanger 17 is actuated by the telescopic drive actuator 21 to swing via the pin 19, and the distance between the bath roll H and the straightening roll 12 is adjusted. To suppress vibrations generated in a steel plate I to be plated when it passes through a bath roll 11 by a straightening roll 12, to prevent warping in the width direction, and to prevent flow of molten zinc entrained on the surface of the straightened steel plate.

As mentioned above, the roll 1 in the bath is immersed in the molten zinc bath 2.
1 is transmission connected to the original fh 115 installed on the ground through a universal joint 13a, an intermediate shaft +3b and a universal joint +3c, and the straightening roll 12 is connected to a base fh115 installed on the ground.
, is transmission connected to a ground motor 16 via an intermediate shaft 14b and a universal joint 14c, and is rotationally driven.

As the universal shaft joints +3a and I4a used in the molten zinc bath 2, which have a very rigid structure and are easy to handle, structures such as those shown in FIGS. 5 and 6, for example, are used. Hereinafter, 11 examples of the universal joint 13a will be explained as a representative example. This universal joint 13a has an inclined intermediate shaft 13b on the drive side (hereinafter referred to as the F drive shaft 13b) and a horizontal roll shaft 11b on the driven side (hereinafter referred to as the driven shaft 11).
b) so as to freely transmit rotation. Four pins 25 are provided at the tip of one of the driving shafts 13b, which are arranged perpendicularly to the axis of the driving shaft 13b and spaced from each other at equal intervals, and at the tip of the other driven shaft 11b. A coupling head 26 having a cavity 27 is provided, and the coupling head 26 is provided with four notches 28 into which the four pins 25 are fitted.

Figures 5 and 6I/? As shown in FIG. 12, coupling heads 2621 provided on the drive shaft 13b and the driven shaft 11b are connected to each other by a cross pin 25a' with the universal joint 13a shown in FIG. There is a model of the following type, but unlike the model shown in Figs. This is difficult to solve in terms of things like intrusion, and cannot be put to practical use.

However, the four pins 2 shown in FIG. 5 and FIG.
In some cases, plating can be performed normally using the flexible shaft mJ'I3a that hooks the notch groove 28 of the coupling head 26 and transmits rotational force in step 5, but depending on the plating conditions etc., scratches may occur on the plated surface of the steel plate. In some cases, inconveniences may occur, such as the occurrence of abnormal patterns.

Until now, the cause of such inconvenience has been the clearance between the four pins 25 and the notch grooves 28, the clearance of the bearings of the bath rolls 11 and straightening rolls 12, or the stains. It was thought to be in slips, etc. However, as a result of investigation by the present inventor, the above-mentioned inconvenient phenomenon is not caused by the cause as previously thought, but is caused by the four-bin structure flexible shaft assembly T-13a itself. It has become clear both theoretically and practically.

FIG. 7 is an explanatory diagram showing the situation in which rotational force is transmitted by the universal joint +3a, +3b is the drive shaft, 111) is the driven shaft, Δ is the bearing point between the drive shaft 131) and the driven shaft 11b, and B is perpendicular to the drive shaft 13b t (C is a plane perpendicular to the driven shaft 11b, I) is the pin 25 and the notch groove 2
8, that is, the point at which the rotational force is transferred (hereinafter referred to as the contact point).

The surface containing the drive shaft 13b and the driven shaft 11b is 1 mm (
Hereinafter referred to as the reference plane), the inclination angle formed by the extension line of the driven shaft 11b and the drive shaft 131) is θ, and the line ΔD connecting the axis intersection point and the contact point is formed between the base γ1 and the blunt point E. The angle is α (hereinafter referred to as the drive shaft rotation angle), and the angle between the line drawn perpendicularly from the point of contact to the driven shaft 11b and the J5 tlj plane E is β (hereinafter referred to as the driven shaft rotation angle).
Then, the following equation holds between the inclination angle θ, the drive shaft rotation angle α, and the driven shaft rotation angle β under the above-mentioned strip '1.

β-tax-'(janαcmθ) (1) Therefore, the angular velocity ω of the driven shaft Ill+ is L if we differentiate the driven shaft rotation β in equation (1) above with respect to time, so we can obtain the following equation (2).
The formula becomes 3'7.

ωz=dβ/di = (stop θ/l −sf” α・−is”/7)・
dα/ (l L (
2) In the above equation (2), c1α/dL is the drive shaft +3b
Therefore, the speed ratio between the driven shaft 11b and the driving shaft 13b is expressed by the following (3).

ω! /ωso=40/(t-=z α・S'+@" θ)
(3) In this universal joint +1a, the driving shaft +3b and the driven shaft 11b
The speed ratio of is not constant but changes as a function of the drive shaft rotation angle α. That is, when α=O° or 180°, ωt/ω1+part θ...minimum α=90'' or 270″', ω, /ω, -1/part θ...maximum The above 2 (3) is Similar to the well-known formula as the spherical double crank mechanism, therefore! As far as I have seen the movement of the two pins arranged at an angle of 0° (#l L,
- There is no difference in the way the two move, and the rotational force is transmitted without any problem with a smooth speed ratio change as shown in FIG.

However, in the four-pin universal joint 13a shown in FIGS. 5 and 6, the change in speed ratio ωt/ω1 is completely different, resulting in l! -tr.

To explain the reason, Fig. 9 is A-A in Fig. 5.
In other words, what corresponds to Fig. 6 is abbreviated as i′in.
However, when the pin 25 is directly above the position with a rotation angle of 0'' as shown in FIG. ring head 2
6 is rotated at the maximum speed of 1/cos θ,
On the other hand, since the pin 25 located 90 degrees in front of this is at position 2, it should be rotating at the lowest speed portion θ. This means that the coupling head t'26 moves faster than the pin 25 at position (2), and therefore the pin 25 at position (2) does not contribute to the transmission of rotational force.

When the state shown in FIG. 9 (t) is reached by rotating in the direction of the solid arrow from the state shown in (a) in FIG. A gap G will open between 25 and the notch groove 2B of the coupling head 26. As the rotation progresses further and reaches the state shown in FIG. 9 (C), the coupling head 26 is now moved near the lowest speed section θ by the pin 25 at position ■, but at this time, the pin 25 at position ■ is at the highest speed. It rotates near 1/cos θ. Then, as the rotation progresses further and attempts to return to the state shown in fa) in Fig. 9, the pin 25 at position 2 collides with the notch 28 of the camp ring I'26, which is moving at a slower speed, and suddenly reaches the maximum speed. 1/n.

shockingly accelerated to.

FIG. 1O is a graph showing the relationship between the rotation angle α of the drive shaft 13b in the four-bin universal joint 13a and the rotational speed ratio ωt/ω1 of the driven shaft 1111 and the drive shaft 13b. This shows that the driven shaft 11b is suddenly and discontinuously changed from the lowest speed portion θ to the highest speed 1/COSθ every time the rotation angle of the shaft 13b increases by 90°.

Generally, as shown in FIG. 11, a first universal joint J is provided between the 1st shaft and the 1st shaft, and a second universal joint 1 □ is provided between the Place the axis and ■ axis in parallel Y (
(The angle θ between the I-axis and the 11-axis is equal to the angle θ between the It is a well-known fact that the fluctuation in the rotational speed ratio that occurs in the universal joint J1 is canceled by the second universal joint J, and that the shaft and the shaft move at the same speed.

However, despite this fact, in the case of the four-bin structure universal joint 13a shown in FIGS. 5 and 6, the speed ratio change occurring in the universal joint 13a is 1Ji.
Although it can be used in the present invention because it is similar to tJ,
A smoother rotational force transmission is desired. In the present invention, each time the following universal joint is used, which improves the weak point of the four-pin universal joint, the roll immersed in the bath can be rotated more smoothly.

3 and 4 show a more preferable structure of a universal joint used in the present invention, in which the drive shaft 13b'
and the driven shaft 11b' are connected to each other at an angle θ by a universal joint 13a'.

One drive shaft 13b' is composed of a spherical body 29 provided at the tip of the drive shaft 13b', and two pins 25a that protrude symmetrically on the spherical parts 2Qa of the two spherical bodies, and the other driven shaft 11 b' is provided symmetrically around a coupling head 26a provided at the tip of the cough driven shaft 11b', a cavity 27a provided inside the coupling head 26a, and the outer periphery of the coupling head 26a. It is composed of two notched grooves 28a communicating with the cavity 27a. Each of these elements is made of a material such as molten zinc-resistant metal or ceramic.

The spherical portion 29a provided on the rod 29 is connected to the drive shaft 13b.
The two pins 25a, which are formed symmetrically with respect to the axis of the drive shaft +31)' and protrude from the spherical portion 2Qa, are in a straight line -1U perpendicular to the axis of the drive shaft +31)'. Also to the coupling rad 2
The axis 6a of the coupling head 26a is located on the axis of the driven shaft 11b, and the two notches 28a are formed symmetrically with the axis of the driven shaft 11b'. The E, y, face piece 29 provided at the tip of the driven shaft 11b' is slidably fitted into the cavity 27a of the coupling rod 26a provided at the tip of the driven shaft 11b', and the two protruding from the spherical part 29a. The pin fits into the notch groove 28a and rotates, and the rotational force of the drive shaft 135' is transferred to the driven shaft I.
It is designed to be smoothly transmitted to l b '. Note that the width of the notch groove 28 is such that the width of the pin 25a in the notch jM28a is
The spherical part 2 of the 0-spherical body 29 has a dimension larger than the diameter of the pin 25a by the required gap bone so that the pin 25a can perform IH movement.
9a is formed to ensure that the position of the intersection point P between the axis of the drive shaft 13b' and the axis of the driven shaft 11b' is maintained stably. Even if the driving shaft 13b' and the driven shaft Ilb' are connected at an angle θ, the two pins 25a allow the shaft to rotate with smooth speed ratio changes in accordance with the state described in accordance with FIGS. 7 and 8. Capable of transmitting force.

When using the swivel joint 13a', if a load is applied at any rotation angle of the pin 25a, the two pins 25a will move in their corresponding notch grooves 28a in accordance with the load direction. The universal joint 13a' is always pressed stably to one side, and no looseness or impact occurs due to the difference between the groove width of the notch jN28a and the pin diameter of the pin 25a. It goes without saying that if two sets are used in combination as shown in Fig. 1, even if any looseness or impact occurs between the two, it will be canceled out, and a more favorable result will be obtained.

<Effects of the Invention> The equipment of the present invention configured in this manner exhibits the following effects compared to the conventional equipment shown in FIGS. 13 and 14.

First of all, in the conventional equipment shown in Figs. 13 and 14, the bath roll 3 had to be placed deep within the molten zinc bath 2, so it was moved from the ground to the universal joint. Even if you try to drive it through the universal joint, the width of the molten zinc bath has to be extremely widened in order to keep it below the maximum usable head angle of the universal joint (approximately 18 degrees), and the universal joint is extremely long. The actual situation is that it is not worth adopting in terms of equipment cost, maintenance cost, workability, practicality, etc. However, in the equipment according to the present invention, 11-11 in the bath Because it is located at a shallow position, there is no need to particularly widen the width of the molten zinc bath, and there is no need for a particularly long universal joint. With the same degree of consideration, the bath roll 11 can be easily driven by the universal joint 13.

By actively driving the roll II in the bath, there is no need to carve grooves on the body 11a of the roll II, and therefore, the shape of the grooves will not be transferred to the surface of the steel plate l to be plated, which will impair quality. In addition, the roll 11 in the bath is connected to the shaft portion 11.
11 and the bearing 1), there will be no inconvenience such as an inability to rotate due to an increase in the IIJ force between the bearing 1 and the bearing 1), resulting in an inoperable operation.

Another is that in conventional equipment, ζ is coated on steel sheets by two support rolls placed above roll 3 in the bath! However, in the equipment according to the present invention, 11-
Each time the position of the report roll 11 is adjusted in the direction of pushing or pulling toward the straightening roll 12, the same function is provided, and the two report rolls 4, which are relatively time-consuming and costly to maintain, are replaced with one By replacing the straightening roll 12 with a book, it is possible to reduce maintenance costs.

Another reason is that in the conventional equipment, the roll 3 in the bath is placed in a deep position, whereas in the equipment according to the present invention, the roll 11 in the bath can be placed in a shallow position. The bathtub 25 can be made significantly shallower, thereby improving the responsiveness of adjusting the molten zinc bath components, reducing equipment costs, and reducing heat consumption.

In addition, the two-bottle type universal joint not only has a simple structure and is easy to manufacture, but also allows smooth transmission of rotational force without impact compared to the commonly used four-bottle type universal joint. By driving the rolls placed in the molten zinc bath, it is possible to perform plating treatment on steel sheets without causing scratches or patterns.

As is clear from the above, the industrial value of the present invention is extremely large.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a side view of an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view of the universal joint according to the present invention, and FIG. 5 is a side view showing a general universal shaft joint, FIG. 6 is a sectional view not shown in the Δ-A direction of FIG. 5, and FIG. An explanatory diagram showing the rotational force transmission situation of the joint, Fig. 8 is a line graph showing the speed ratio change of the pin of the universal shaft joint, and Fig. 9 is a diagram showing the general universal shaft assembly.
An explanatory diagram showing the relationship between the L pin and the notch groove, FIG. 10 is a diagram showing the change in speed ratio of the pin of a general universal joint, and FIG.
Figure 1 is an explanatory diagram showing the arrangement relationship of the drive shaft, intermediate shaft, and driven shaft. Figure 12 is a perspective view showing another general universal joint.
FIG. 3 is a sectional view showing the side surface of the conventional example, and FIG. 14 is a front view of FIG. 13. 1... Steel (reverse), 2... Molten zinc bath, 5... Wiping nozzle, 9... Bathtub, IO
... Plating equipment, 11... Roll in bath,
12... Straightening roll, 13... Universal joint, 18... Sliding bearing, 19... Bin, 2
DESCRIPTION OF SYMBOLS 1... Telescopic drive actuator, 23... Correction roll hanger, 24... Sliding bearing, 25... Pin, 26... Coupling head, 27... Cavity part,
28... Notch groove, 29...) X-hedron.

Claims (3)

[Claims] 1. In plating equipment that continuously hot-dip galvanizes strip-shaped steel sheets, the steel sheet to be plated is pulled into the hot-dip zinc bath, and the direction is changed upward, and the position is adjusted back and forth to eliminate warpage in the width direction of the steel sheet. The steel plate to be plated is sandwiched between the bath rolls and placed at a position higher than the axis of the bath rolls in order to suppress vibrations occurring in the steel plate to be plated whose direction has been changed and to keep the bath position constant. and straightening rolls arranged to face each other in a molten zinc bath, and both the rolls in the bath and the straightening rolls or only the rolls in the bath are rotated by a prime mover installed outside the bath via a universal joint. Hot-dip galvanizing equipment characterized by being configured to be driven. 2. 2. The hot-dip galvanizing equipment according to claim 1, wherein the tops of the bodies of the rolls in the bath and the straightening rolls are immersed below the surface of the hot-dip zinc bath to a depth of 50 mm or more and 200 mm or less. 3. As a universal joint, one shaft of the universal joint is composed of a spherical body provided at the tip of the one shaft, and two pins that protrude symmetrically onto the spherical part of the spherical body. a coupling head with the other shaft provided at the tip of the other shaft; a cavity provided inside the coupling head; and a cavity provided symmetrically around the outer periphery of the coupling head. Leads to 2
The spherical part of the spherical body is formed symmetrically with respect to the axis of the one shaft, and the two pins are on a straight line perpendicular to the axis of the one shaft. , and in the coupling head, the axis of the coupling head is on the axis of the other shaft, and the two notch grooves are formed symmetrically with the axis of the other shaft, and the one The spherical body provided at the tip of the other shaft fits into the cavity of the coupling head provided at the tip of the other shaft, and the two pins fit into the two notched grooves. 2. The hot-dip galvanizing equipment according to claim 1, wherein the rotational forces of one shaft and the other shaft are configured to be able to be transmitted to each other.