JPH10251820A - Wiping device for hot dip metal coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiping device for hot dip metal coating which makes one set of baffle plate moving devices usable commonly to plural units of the wiping devices by not integrally mounting the baffle plate moving devices on the wiping devices but separating both. SOLUTION: This wiping device has moving trucks 15 which control the positions of the baffle plates 16 for regulating the gaseous flow of the edge parts of a steel strip 3 in follow up to the steel strip edges, truck storage stands 8 which are fixed and arranged on both sides at the top edges of a plating bath tank 1, a front side frame which has rails 10 disposed connectably with the rails 11 for the trucks of these stowage stands 8 and is installed in parallel with the surface of the steel strip 3 across the plating bath 2 and a rear side frame 7 which is divided therefrom, is installed symmetrical therewith across the steel strip 3 and has the rails 10 likewise disposed connectably with the rails 11 for the trucks of the stowage stands. The moving trucks 15 are retreated toward the stowage stands 8 at the time of non-operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing molten metal from a plating bath by removing excess plating solution from a plating bath by gas wiping. The present invention relates to an improvement of a wiping apparatus for hot-dip metal plating which adjusts the amount of applied plating.

[0002]

2. Description of the Related Art When a steel strip is continuously coated with a molten metal such as zinc plating, the amount of plating is generally controlled by a gas wiping method. By gas wiping method,
When spraying wiping gas from the wiping nozzle to the front and back surfaces of the steel strip to adjust the amount of plating, it is desirable to remove the excessively deposited hot-dip plating metal locally and make it uniform in the width direction of the steel strip. . However, at both edges of the steel strip, the turbulence of the gas flow caused by the collision of the wiping gas blown from the front and back nozzles has an adverse effect, the removal capacity is reduced, and the excess plating metal remains attached, so-called edge overcoat The phenomenon tends to occur. In order to prevent this edge overcoat phenomenon, a baffle plate as a dummy is placed close to the steel strip edge, and a wiping device that adds a virtual steel strip to rectify the gas flow at the edge part. Has been adopted. The wiping device is
Position control is necessary in order for the baffle plate to follow the edge of the steel strip and to maintain an interval within a certain range. For this reason, a moving cart system is often used.

[0003] For example, Japanese Patent Publication No. 52-43457 discloses that a rail fixed to a foundation is disposed on one side of a steel strip to be plated while being inclined at a V-shaped angle of 3 to 10 ° with respect to the horizontal direction. At each end of the trolley, a trolley is placed on a fixed rail, and two upper and lower arms connected to each trolley via a spring or the like are attached to each of the trolleys. Arm is provided with a baffle plate which is held at a certain distance from the steel strip edge, and the bogie itself is provided with slides for holding the rail on the legs, and is mounted on the rail base to advance the steel strip. The figure shows that the distance between the baffle plate and the steel strip edge is kept at 1 mm or less by completely adjusting the front-back or left-right fine movement even when the speed changes and meanders.

In Japanese Patent Publication No. 5-230610, a beam (rail) extending in the width direction of a steel strip is provided above a wiping nozzle for both front and back sides of the steel strip. The set wheels are rolled to allow the truck to move in the width direction of the steel strip, and the gap distance between the baffle plate attached to the truck and the steel strip edge is controlled to be maintained within a certain range. Things are disclosed.

In Japanese Patent Application Laid-Open No. Hei 2-1077752, a gantry rail is installed on both sides of a steel strip in the width direction, and a movable body (cart) moving along the gantry rail is provided as a baffle plate. Hang the side plate,
There is disclosed a gas wiping device in which a moving body is moved by means such as a driving cylinder to adjust a separation distance between a side plate and an edge of a steel strip.

Further, Japanese Patent Application Laid-Open No. Hei 6-330275 discloses that a steel strip is bent by a sink roll in a plating bath and pulled up vertically as it is. In consideration of the fact that deformation and warpage occur in the vertical direction with respect to the steel strip surface due to various conditions, it not only follows the position fluctuation in the width direction of the steel strip but also responds to the edge overcoat phenomenon caused by vertical deformation and warpage In order to do so, a width direction moving mechanism composed of a rail extending in the width direction of the steel strip and a movable trolley, and a rail and a movable trolley mounted on the movable trolley of the width direction moving mechanism and extending in the vertical direction of the steel strip. And a tilting mechanism mounted on a movable trolley of the vertical moving mechanism.
A wiping device having a baffle plate which is movable in a vertical direction and whose inclination can be freely changed is shown.

[0007]

In the above various wiping apparatuses of the conventional gas wiping method, the performance of the baffle plate for preventing the edge overcoat phenomenon by adjusting the flow of the wiping gas at the edge of the steel strip. How it directly affects the plating quality of the steel strip. Therefore, sufficient precision is required for controlling the position of the baffle plate. Therefore, as a baffle plate moving device, a system has been adopted in which a moving vehicle having a baffle plate is mounted on a wiping device, and the position of the moving vehicle is precisely controlled by following the steel strip edge.

However, a wiping device generally includes:
In addition to the trolley, which is a moving device for the wiping nozzle and baffle plate, a sink roll immersed in the hot-dip plating bath and its supporting arms are also included, but the components in the hot-dip plating bath are heavily consumed. After a few days of use, they need to be replaced and overhauled. For this reason, a plurality of wiping devices are prepared for a set of hot-dip plating baths, and the wiping devices are usually circulated for use while exchanging the baffle plate moving device. In that case, there should be no difference in performance between the baffle plate moving devices of the plurality of wiping devices.

As described above, it is disadvantageous in terms of cost to prepare a plurality of baffle plate moving devices requiring a high degree of positioning accuracy as in the prior art, and it is necessary to maintain the accuracy by frequently attaching and detaching and repeating the handling operation. Is difficult. Furthermore, recently, the division and weight reduction of the wiping device have been promoted, and it has become difficult to mount the baffle plate moving device on the wiping device.

Accordingly, the present invention has been made in view of such a conventional problem, and a baffle plate moving device is separated from each other without being integrally mounted on a wiping device, thereby providing a baffle plate moving device. An object of the present invention is to provide a wiping device for hot-dip metal plating, in which a plate moving device can be commonly used for a plurality of wiping devices.

[0011]

In order to achieve the above object, according to the present invention, a wiping gas is blown from a wiping nozzle to a strip continuously running through a molten metal plating bath. In a wiping apparatus for molten metal plating for adjusting the amount of plating, a baffle plate for rectifying a gas flow at an edge portion of the band-shaped body is mounted, and a movable carriage whose position is controlled to follow the edge is controlled. A trolley storage stand fixedly arranged on both sides of the upper edge of the plating tub for storing during operation, and a rail provided so as to be connectable to a trolley rail of the storage stand, straddling over the plating bath and the surface of the band-shaped body. The front side frame installed in parallel with the front side frame is divided and installed symmetrically with the band-shaped body interposed therebetween, and also provided so as to be connectable to the truck rail of the storage stand. A back-side frame having rails, and during operation, the movable carriage moves onto the rails of the front and rear frames from the rail of the carriage storage stand to control the position of a baffle plate that follows the edge of the band-shaped body. During operation, the movable carriage is retracted toward the storage stand.

When replacing the wiping device of the present invention configured as described above, the baffle plate moving trolley is stored on the trolley storage stand. After that, the front and back frames and the attached wiping nozzle and sink roll,
Replace the supporting arms with spare ones. Therefore, a pair of left and right baffle plates and a set of movable carts can be commonly used for a plurality of wiping devices.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II. In the figure, reference numeral 1 denotes a zinc pot which is a hot-dip metal plating bath, and 2 denotes a zinc bath in the zinc pot 1, and a steel strip 3 which is a belt-like body has entered the bath. Although not shown, the steel strip 3 is turned around via a sink roll supported in the zinc bath 2 and then rises almost vertically and is guided out of the bath.

In the wiping device 5 of the present invention, a frame sandwiching the steel strip 3 rising from the zinc bath 2 is divided into a front frame 6 and a back frame 7 and symmetrically arranged. Each of the frames 6 and 7 is laid across the zinc pot 1 in parallel with the surface of the steel strip 3, and both ends are detachably fixed to the upper edge 1 a of the zinc pot 1 with bolts or the like.
The upper edge 1a of the zinc pot 1 where the ends of the front and back frames 6 and 7 are fixedly supported,
A pair of left and right carriage storage stands 8 and 8 are fixedly installed so as to be sandwiched between the fixed ends of the carriage 7. Incidentally, in the case of the conventional wiping device, both ends of the two frames are integrally formed in a continuous frame shape, and the carriage storage stands 8, 8 are not installed.

The front frame 6 and the back frame 7
The wiping nozzles 9 and 9 are respectively suspended via mounting arms (not shown) so as to approach both sides of the steel strip 3. Further, a sink roll (not shown) and supporting arms thereof are also held.

Further, a pair of right and left bogie rails 10, 10 extend from the position close to the bogie storage stand 8 to near the center of the frame on the inner surface of the front side frame 6 facing the steel strip 3. Similarly, a pair of right and left bogie rails 1 is also provided on the inner surface of the back frame 7 facing the steel strip 3.
0 and 10 are extended. On the other hand, the front and back frames 6,
A pair of trolley rails 1 are provided on the upper surfaces of the two trolley storage stands 8 and 8 fixedly disposed near both ends of the trolley rail 7 so as to be connectable to the trolley rails 10 on the inner surfaces of the front and rear frames.
1 is installed.

The wiping device 5 is equipped with a pair of left and right movable carts 15 and 15 that run on the cart rails 10 and 10 installed on the front and back frames 6 and 7, respectively. An edge sensor 17 for detecting the edge of the steel strip 3 is attached.
The type of the edge sensor 17 is not particularly limited, but is preferably a non-contact type such as an optical sensor or a magnetic sensor. In this embodiment, an optical sensor is used.

The baffle plate 16 is fixed to the lower surface of the movable carriage 15 while maintaining a height corresponding to the wiping nozzle 9 to rectify the gas flow at the edge of the steel strip 3.
On the other hand, the edge sensor 17 is installed so as to sandwich the edge of the steel strip 3 between the light emitter 17a and the light receiver 17b attached to the tips of two parallel arms 18 protruding toward the steel strip 3 from the upper surface of the movable carriage 15. I have.

Although a motor incorporating a motor (not shown) is shown as a driving means of the movable carriage 15, it may be driven by a cylinder device mounted on the carriage storage stand 8, for example. In any case, the drive source of the movable trolley 15 and its control device are installed on the movable trolley 15 or the trolley storage stand 8 side, and only the trolley rail 10 is installed on the front and back frames 6 and 7.

Next, the operation will be described. During a normal operation, the movable carriage 15 is moved on the carriage rails 10 of the front and rear frames 6 and 7 (the carriage on the right side of FIG. 2 indicates a position at the time of operation, but for explanation, The bogie on the left side shows a state where the bogie is stored in the bogie storage stand when not in operation.) And the steel strip 3 detected by the edge sensor 17
The moving carriage 15 is moved in a predetermined direction by a predetermined distance based on a control command output from a control device (not shown) in response to the fluctuation of the edge due to the meandering of the baffle plate 16 and the baffle plate 16 attached to the moving carriage 15. Control is performed such that the distance to the edge of the band 3 is always maintained within a predetermined appropriate range.

As described above, since the position of the movable carriage 15 and thus the position of the baffle plate 16 are always controlled to be appropriate, the gas flow generated by the collision of the gas ejected from the wiping nozzles 9 on both the front and back sides of the steel strip 3 is reduced. Disturbance is reliably prevented, and no edge overcoat phenomenon occurs.

When the operation is continued for several days and the sink rolls and the supporting arms immersed in the hot-dip plating bath are consumed, the operation is temporarily stopped, and the consumable parts are replaced and overhauled. At that time, the movable cart 15 is pulled toward the cart rail 11 of the cart storage stand 8 and is evacuated from the front and back frames 6 and 7. Then, both front and back frames 6,
7 is removed from the upper edge 1a of the zinc pot 1 and the sink rolls and the like are taken out of the zinc bath 2 and passed to the overhaul, and the spare front and back frames 6, 7 and the sink rolls and their supporting arms and the like prepared in advance are prepared. Attach the set to the zinc pot 1 and replace it. When this exchange is completed, the mobile trolley 15, which has been evacuated to the trolley storage stand 8, is moved onto the trolley rail 10 of the new front and back frames 6, 7, and the operation is resumed.

Thus, according to the present embodiment, a set of the baffle plate 16, the movable trolley 15, and its control device can be commonly used for a plurality of wiping devices.

[0024]

As described above, according to the first aspect of the present invention, a set of a baffle plate, a movable cart and its control device can be commonly used for a plurality of wiping devices. The effect is obtained.

[0025] Equipment costs can be greatly reduced as compared with a case where a baffle plate moving device including a set of a baffle plate and a position control device thereof is used for each of a plurality of wiping devices.

[0026] Since the baffle plate moving device requiring positional accuracy can be installed on the bogie storage stand on the fixed side, accuracy deterioration during operation hardly occurs, and high-precision positioning can be performed for a long period of time.

[0027] Since there is no variation in the positional accuracy of the baffle plate due to a difference between a plurality of wiping devices, higher accuracy can be obtained than in the past. The weight of the wiping device is reduced by separating the baffle plate moving device and the frame, and the replacement of the wiping device is facilitated.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plating bath (zinc pot) 3 strip (steel strip) 5 wiping device 6 front side frame 7 back side frame 8 trolley storage stand 9 wiping nozzle 10 trolley rail 11 trolley rail 15 moving trolley 16 baffle plate

Claims (1)

[Claims] 1. A molten metal plating wiping apparatus for adjusting the amount of plating by blowing a wiping gas from a wiping nozzle onto a strip continuously moving through a molten metal plating bath, wherein a gas at an edge of the strip is provided. A movable carriage mounted with a baffle plate for rectifying the flow and position-controlled following the edge, and a carriage storage stand fixedly arranged on both sides of an upper edge of the plating bath to store the movable carriage during non-operation,
A front side frame which is provided with a rail provided so as to be connectable to a trolley rail of the storage stand and which is laid across a plating bath and is set in parallel with the surface of the band-shaped body; and the front side frame is divided and sandwiches the band-shaped body. A back frame having a rail provided so as to be symmetrically installed and also connectable to a truck rail of the storage stand, and the movable carriage is transferred from the rail of the carriage storage stand to the rail of the front and back frames during operation. A position control of a baffle plate following an edge of the band-like body, and retracting the movable carriage toward the storage stand when not in operation, the wiping apparatus for molten metal plating.