JPS6036593Y2 - Continuous melt plating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous hot-dip plating apparatus for increasing the amount of plating deposited in continuous hot-dip plating of strips or wires.

Continuous hot-dip plating of strips or wires generally involves continuously feeding strips or wires whose surfaces have been purified through a pretreatment process such as pickling into a plating bath, immersing them in the bath, plating them, and then releasing them upward from the plating bath. This is done by adjusting the amount of plating to be uniform by pulling it out and gas wiping, etc., so that the amount of plating deposited will be reduced to a much larger extent than the thickness when it is pulled out from the bath due to the adhering plating falling off when it is pulled out from the bath, and the wiping operation etc. , 5009/Td or more is said to be difficult to commercialize.

However, due to the significant deterioration of environmental pollution and the rise in steel prices in recent years, it is necessary to improve the corrosion resistance of construction materials such as roofing materials, gutter materials, wire ropes, and reinsertion wires for submarine installations to extend their service life. Many attempts have been made to extend the length, and for this purpose hot-dip plated strips or wires with a plating coverage of 500 to 10,0 OOP/rIl are desired.

The present invention is intended to meet the above-mentioned needs, and includes a pull-out passage that protrudes from the bottom of the plating tank to draw out the plated steel material downward.
The drawing passage includes a gap for forming a layer in which the plating solution surrounds the steel material and a cooling means for cooling the plating layer, and a sealing device is provided at the exit of the passage to prevent leakage of the plating solution. It is characterized by

The present invention will be explained in detail below with reference to the drawings shown as examples.

FIG. 1 shows the arrangement of a continuous hot-dip galvanizing apparatus for strip or wire according to the present invention.

In the illustrated example, the strip 2 or wire 3 unwound from the coil 1 carried into the line is transferred to an oxidation furnace 4, a reduction zone 5,
The surface is purified by passing through a pre-treatment process such as a cooling zone 6, and the down chute 7 is maintained in a reducing gas atmosphere.
It is continuously supplied into the plating bath 8 from the wafer, and is immersed in the bath 9 to be galvanized.

10 is a zinc pre-melt furnace that supplies a plating bath 9 to a plating tank 8.

The process up to this point is similar to the conventional continuous hot-dip galvanizing apparatus for strip or wire.

In the present invention, the plating tank 8 is provided with a drawer passage 11 protruding downward from the bottom in which the plating solution is stored, and the strip or wire that is galvanized in the plating tank 8 passes through the plating solution in the drawer passage 11. The coating has an increased amount of plating, is drawn out from the lower part of the pull-out passage 11, and is wound into a coil by a take-up reel 12 through a post-processing process (not shown).

FIG. 2 shows an example of a plating tank in a continuous hot-dip galvanizing apparatus for strip, and is an enlarged perspective view of the vicinity of the pull-out passage 11 in FIG. 1.

As shown in the drawing, the entrance 13 at the top of the pull-out passage 11 is connected to the plating tank 8.
The tank 8 is removably connected to the slit 14 that crosses the bottom of the tank 8.
The outlet 1 is opened inward and protrudes downward from the bottom of the tank 8.
5 is an open but airtight rectangular tube-shaped passage of an appropriate length, through which the strip 2 passes.

The pull-out passage is provided with a certain gap 16 for forming a thin layer of plating solution surrounding the strip, and a cooling means 17 for cooling the plating layer from the outside, and the outlet of the passage is provided with a cooling means 17 to prevent leakage of the plating solution in the passage. A sealing roll 18.18 is provided for blocking the outlet to prevent this.

In the illustrated example, the cooling means 17 consists of a cooling water channel 19 that is arranged in multiple stages at regular intervals above and below in contact with the outer periphery of the passage 11, and cooling water from a water source (not shown) circulates within the water channel 19. It is configured like this.

Further, the seal rolls 18, 18 are provided on the roll surface in contact with the edge of the outlet 15 of the passage 11, facing each other horizontally in the width direction of the passage, and sandwich the plating strip pulled out from the outlet 15 to uniformly obtain a desired thickness. The spacing between the rolls 18 and 18 is determined so as to squeeze out the plating solution, and the rolls 18 and 18 are driven by a drive device (not shown) at a rotational speed corresponding to the drawing speed of the strip, and have the function of adjusting the amount of plating deposited. It also has the following.

In the present device for continuous hot-dip galvanizing of wire rods, as shown in the enlarged perspective view of the vicinity of the pull-out passage in FIG. Possibly, for example, it is a plug-connected passageway opening into the bath 8 and projecting downward from the plating bath, the outlet 22 being open but having an airtight cylindrical shape and having a suitable length.

The pull-out passage 11 is provided with a certain gap 16 for forming a layer surrounding the wire with the plating liquid, and a cooling means 17 for cooling the plating layer from the outside, and the outlet of the passage is provided with a cooling means 17 for cooling the plating layer from the outside. A sealing die 23 is provided to seal the outlet to prevent leakage.

In the illustrated example, the cooling means 17 is constructed by attaching a water supply pipe 25 connected to a water source (not shown) to the upper part of a cooling water channel 24 provided around the pull-out passage 11, and a drain pipe 26 to the lower part thereof.
It is configured to circulate cooling water within 4.

Further, the sealing die 23 is connected to the outside of the outlet 22 of the passage 11 and has the function of adjusting the amount of plating by squeezing the plating solution of the plated wire 3 drawn out from the outlet 22 of the passage 11 to a desired thickness. It also has the following.

Due to the above-mentioned configuration of the present device, in the case of continuous hot-dip galvanizing of strips or wires, the plating solution introduced into the passage 11 from the plating bath 8 is transferred to the cooling means 1 surrounding the outer periphery of the passage.
7, the temperature gradually decreases from the top to the bottom and the viscosity increases, becoming viscous near the exit of the passage, so that the plating liquid does not leak out of the passage 11 from the seal rolls 18, 18 or the die 23. Instead, the amount of plating deposited is narrowed down by the seal roll 18, 18 or the die 23 and adjusted to the desired amount uniformly, and then pulled out from the passage 11, passed through a post-processing process, and wound onto the take-up reel, so that the desired thickness can be achieved. Excellent quality hot-dip galvanized products are obtained with a coating coverage of .

In addition, in the present device, a desired thickness of plating can be achieved by simply adjusting the gap between the seal rolls 18 and 18 or the size of the die 23 in accordance with the desired amount of plating on the strip or wire. It has the advantage of providing a plating strip.

Next, the effects of the present apparatus will be explained using an example in which strips were continuously hot-dip galvanized in a test plant for the present apparatus.

The proposed apparatus was installed in the test continuous hot-dip galvanizing line of the Sendzimir method shown in FIG. A continuous hot-dip galvanizing test was conducted using two types of Orrrm test materials.

The material of the test material is C0.07%, 5iO001%, Mn
They were 0.29%, Po, 011%, and 30.009%.

First, for the test material with a thickness of 1.6 m, the target plating amount was 500 f/ly1'', 1250 t!/po, 9,9
00g/rrl, and for the 2.0mm thick test material, the target plating amount was 3.000g/rrl,
Continuous hot-dip plating was carried out using two types of 6.600 g/lri, each with the roll interval of the seal roll adjusted each time to correspond to the target plating amount, and the results are shown in Table 1.

As shown in the table above, 1.6mm and 2. The amount of plating deposited on both OB materials was close to the target value, and the surface conditions were all good.

As mentioned above, the device of the present invention dramatically increases the amount of plating deposited on a continuous hot-dip plating line for strips or wires by simply providing a pull-out passageway with a gap of a desired size projecting downward from the bottom of the plating bath. Seshime, 500
~10.000! Since it is possible to obtain a desired thickness of plating within the V/d range, it is extremely effective in improving the corrosion protection performance and extending the service life of hot-dip plated strips or hot-dip plated wires.

[Brief Description of the Drawings] Fig. 1 is a layout diagram showing an example of the device of the present invention, Fig. 2 is an enlarged perspective view of the vicinity of a pull-out passage in a continuous hot-dip galvanizing device for strip, and Fig. 3 is a continuous hot-dip galvanizing wire rod. FIG. 3 is an enlarged perspective view of the vicinity of a pull-out passage in the plating apparatus. 1... Coil, 2... Strip, 3
...Wire rod, 4...Oxidation furnace, 5...
...Reduction zone, 6... Cooling zone, 7... Down shoot, 8... Plating tank, 9...
・Plating bath, 10... Pre-melt furnace, 11...
Thinning out passage, 12...Take-up reel, 13.20
...Entrance, 14...Slit, 15.
22...Exit, 16...Gap, 17.
... Cooling means, 18 ... Seal roll,
19... Cooling water channel, 21... nozzle, 23...
... Seal die, 24 ... Cooling water channel,
25... Water supply pipe, 26... Drain pipe.

Claims (1)

[Scope of utility model registration request] A pull-out passage 11 of an appropriate length is protruded downward from the bottom of the plating tank 8 to pull out the plating strip 2 or the plated wire 3, and the pull-out passage has a certain gap that allows a thin layer of plating solution to be formed around the strip or wire. 16 and a cooling means 17 for cooling the plating layer from the outside, and a seal roll 18 or a die 23 is provided at the outlet of the passage to prevent leakage of the plating solution.