JPS6048589B2 - Continuous dry hot-dip galvanizing equipment for long steel materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to relatively long steel pipes, which are called long fabrics due to their dimensions, and have an outer diameter of about 20-100 mm and a length of about 4-8 m. The present invention relates to a device for continuously and automatically dry hot-dip galvanizing a material to be plated without using flux.

Conventionally, in hot-dip galvanizing equipment not only for long items but also for steel materials in general, when the steel material to be coated is fed into the plating bath, the moisture attached to the steel material is always removed by a molten flux layer in a flux box, and at the same time, the moisture attached to the steel material is removed by the flux action. It is designed so that the pure steel surface can be exposed.

However, since this molten flux mainly consists of ammonium chloride and zinc chloride, NH4Cl decomposes into NH due to moisture. Although it has some favorable properties as a flux, such as converting into HCl, it worsens the working environment and may even become a pollution problem. Therefore, there is a strong demand for dry galvanizing without using molten flux.

However, in conventional hot-dip galvanizing equipment for long steel materials, the device that pushes the copper material to be plated into the plating chamber moves intermittently, and even if this point has been improved, it does not operate continuously. Even if it is suitable for automation, or even if continuous automation is possible, the pushing device is conveyor-type, so the bath is stirred every time it goes in and out of the plating bath, creating unnecessary oxides, and the conveyor chain is inconvenient. There are problems such as zinc adhering and solidifying, making it difficult to move and having a significantly short lifespan.
At present, no continuous automated equipment capable of dry hot-dip galvanizing has yet been developed. This invention was devised in order to solve these problems in view of the above-mentioned circumstances, and the feature of this device is to continuously and automatically coat the long steel material to be coated with molten zinc in the plating bath. When pushing the steel into the steel, the shape of the screw that controls this and the shape of the claw of the paddle foil should be structured to ensure space for the delivery of the steel material, and the rotational speeds of both should be appropriately selected and synchronized. As a result, when the steel material is transferred from the screw to the pawl of the paddle wheel, a completely natural static movement is performed.

Next, the continuous dry hot-dip galvanizing apparatus of the present invention for long steel products will be explained based on the embodiment shown in the drawings.

FIG. 1 is an explanatory cross-sectional view of the main parts of the apparatus of the present invention.
Reference numeral 4 denotes a plating tank, which has a sufficient length to accommodate the long steel material S to be plated.

Reference numeral 5 denotes a screw, which is vertically installed on one side of the plating tank from above toward the inside of the plating tank.

This screw 5 has at least two or more screws necessary for pushing the long steel material supplied along this slope from the guide frame 3 into the molten zinc in the plating tank 4 while being placed on the top surface of the screw. Preferably, three or more are required to be provided at appropriate intervals in the longitudinal direction of the plating tank 4. When plating a hollow object such as a steel pipe, it is necessary to sink the object at an angle, and for this purpose, objects of different heights are arranged so that the object to be plated has an inclination of, for example, 51,100 degrees. Incidentally, each screw 5 is rotated in the same direction by a drive shaft 9 via a gear 10. Reference numeral 1 denotes a paddle foil, which is installed along the longitudinal direction in the molten zinc in the plating tank 4 at the same angle as the screw gives to the object to be plated.

The paddle foil 1 has a claw 2 at a position where it contacts the lower part of each of the screws 5, and the steel material S placed on the screw 5 is pushed into the molten zinc by the claw 2. The delivery is performed statically, but in order to do so, the drive shaft 9 of the screw 5 is driven by a single prime mover, and the drive shaft 9 of the screw 5 is driven by a single prime mover, and while the screw 5 rotates once (6 to 12 seconds). It is sufficient to set it so that the pawl 2 of the paddle foil 1 advances to the - pitch.
Reference numeral 6 denotes a pull lever, which is vertically installed on the other side of the plating tank 4 from above toward the inside of the plating tank 4. It is designed to be able to pull at least two of them toward the other side.

7 is a cylinder/piston mechanism for this purpose, and 8 is a link mechanism which, when operated, moves the steel material S by the pawl 2 of the paddle wheel 1 and sets it on the other side of the plating tank 4. 11. The steel material S moved to the receiving tray 11 is moved to the outside of the plating tank 4 by a moving device (not shown) such as a magnetic roll, and is subjected to so-called air wiping. Figure 2 is an explanatory diagram showing the shape of the space when the copper material S is delivered from the screw 5 to the pawl 2 of the paddle foil 1, and the pitch of the screw 5 is changed between the part immersed in the bath and the part where it is delivered. ,
While the screw 5 rotates from 0° to 90°, the movements of the claw 2 and the screw 5 are almost completely matched, and the steel material S
It can be seen that the transfer can be made statically moving without any difficulty.
The continuous dry hot-dip galvanizing apparatus for long steel materials of the present invention has the following features:
With the above configuration, once the steel material to be plated is selected up to the guide frame 3, it is continuously and automatically immersed in the molten zinc in the plating tank and statically moved to be plated. After draining is completed, it can be automatically transferred to the next process such as thread cutting, which not only avoids harmful fumes caused by molten flux, but also the equipment itself has an extremely simple structure and has a long service life. This provides various benefits such as long service life and low maintenance costs.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of the main parts of the device of this invention,
FIG. 2 is an explanatory diagram of the delivery space between the screw and the pawl of the paddle foil. 1...Buddle foil, 2...Claw, 3
...Guide frame, 4...Plating tank, 5...
...Screw, 6...Pull lever, 7
...Schilling piston mechanism, 8...
・Link mechanism, 9... Drive shaft, 10...
...Gear, 11...Saucer.

Claims (1)

[Claims] 1 At least two screws for pushing steel material that rotate in the same direction are vertically installed on one side of the plating tank from above toward the inside of the plating tank, and horizontally installed in the plating tank along the longitudinal direction. A steel material delivery paddle wheel is installed in the plating tank and has claws in contact with the lower part of each of the screws, and rotates simultaneously with the screws, and is vertically erected on the other side of the plating tank from above toward the inside of the plating tank. A continuous dry hot-dip galvanizing apparatus for a long steel material, comprising at least two plating material pulling levers that can be operated to pull the material toward the other side.