JP3533028B2 - Wire plating equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rod plating apparatus of a type in which plating is restricted by gas.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional galvanizing apparatus of this type, in which an iron or steel wire 1 is placed in a galvanizing bath 2 for molten zinc.
When the wire is dipped in and pulled up, a gas throttle part 3 for controlling a plating thickness by spraying a non-oxidizing gas on the surface of the wire rod 1 is provided. The non-oxidizing gas is supplied to No. 3. Normally, a plurality of gas restrictors 3 are provided side by side, and a large number of wire rods 1 are plated at the same time.

[0003]

In the above-described plating apparatus, when a part of the plurality of gas throttle portions 3 is not used due to thinning operation or the like, the gas pressure of the remaining gas throttle portions 3 increases and the plating thickness increases. There was a drawback that was fluctuating. Therefore, a first object of the present invention is to solve such a problem, and even when a part of the gas throttle portions 3 is no longer used, the gas pressure of the remaining gas throttle portions 3 does not change, and the plating thickness is not changed. The object of the present invention is to provide a plating apparatus capable of performing high-quality galvanizing with a constant temperature. Further, conventionally, when the exothermic gas generator 4 fails or is stopped for maintenance and inspection, it is necessary to stop the operation of the entire plating apparatus. Therefore, a second object of the present invention is to provide a heat generating gas generator 4 even when it stops due to a trouble,
It is an object of the present invention to provide a plating apparatus that does not need to be stopped and can prevent a decrease in operating rate.

According to the first aspect of the present invention, as shown in FIG. 1, when the wire rod 1 is immersed in the plating tank 2 and pulled up, a non-oxidizing gas is sprayed on the surface of the wire rod 1 to control the plating thickness. In a wire rod plating apparatus including a plurality of the above, a cushion tank for preventing pressure fluctuations in a gas supply pipe 5 for supplying non-oxidizing gas from the non-oxidizing gas source 4 to the gas throttle unit 3
Output side of cushion tank 10
The pressure sensor 11 is installed in the
The gas discharge pipe 7 equipped with the quantity control valve 6 is branched to
The flow control valve so that the output of the sensor 11 shows a constant value.
The non-oxidizing gas corresponding to the unused gas throttle 3 is diverted to the gas discharge pipe 7 by controlling the opening of No. 6, and the invention of Claim 2 is the same as in FIG. Two
As shown in FIG. 3, a bypass pipe 9 having a switching valve 8 is provided in parallel with the exothermic gas generator 4 that burns city gas or the like as a non-oxidizing gas to generate exothermic gas. When the gas generator 4 is stopped, city gas or the like is supplied to the gas restrictor 3 instead of the heat generating gas.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, in which a steel wire 1 is immersed in a molten zinc bath 2 for galvanizing, and the steel wire 1 is pulled up from the bath 2. At this time, a gas throttle portion 3 is provided for controlling the plating thickness by spraying a non-oxidizing gas on the surface. A plurality of gas throttles 3 are provided side by side so that a large number of steel wires 1 can be plated at the same time. Further, the exothermic gas generator 4 burns city gas as non-oxidizing gas to generate exothermic gas, and pressure fluctuations occur in the non-oxidizing gas supply pipe 5 on the output side of the exothermic gas generator 4. The cushion tank 10 for preventing the
A gas discharge pipe 7 having a flow control valve 6 is branched from 0. The opening degree of the flow rate control valve 6 is controlled by a control signal sent from a control device (not shown) so that the output of the pressure sensor 11 provided on the output side of the cushion tank 10 shows a constant value. The gas pressure supplied to the throttle unit 3 is always maintained at a constant value.

In the embodiment shown in FIG. 2, a bypass pipe 9 having a switching valve 8 is connected in parallel with the exothermic gas generator 4. When the gas generator 4 is stopped, the exothermic gas is replaced by the city gas. The gas is supplied to the gas throttle unit 3. According to this configuration, even when the gas generator 4 fails or is stopped for maintenance or the like, it is possible to operate the plating device and prevent a decrease in the operating rate. in this case,
Since the exothermic gas is a fuel gas diluted by about 10 times, the fuel consumption is temporarily increased by stopping the gas generator 4, but the benefit of preventing a decrease in the operating rate is far greater. Of. The unburned gas discharged to the outside of the system passes through the suction duct, is sufficiently diluted with dilution air, and is then discharged outdoors.

[0007]

According to the present invention, as described above, the gas pressure supplied to each gas throttle portion 3 is changed so that the non-oxidizing gas corresponding to the unused gas throttle portion is diverted to the gas discharge pipe 7. There is an advantage that it can be maintained at a constant value with an extremely simple structure, and by connecting the bypass pipe 10 equipped with the switching valve 9 in parallel with the exothermic gas generator 4,
When the gas generator 4 is stopped, city gas is supplied to the gas restrictor 3 instead of the exothermic gas, so the plating device is operated even when the gas generator 4 fails or is inspected, resulting in a decrease in operating rate. There is an advantage that can be prevented.

[Brief description of drawings]

FIG. 1 is a piping system diagram of an embodiment of the present invention.

FIG. 2 is a piping system diagram of another embodiment of the present invention.

FIG. 3 is a piping system diagram of a conventional example.

[Explanation of symbols]

1 wire rod 2 plating tank 3 Gas throttle 4 Non-oxidizing gas source or exothermic gas generator 5 Non-oxidizing gas supply pipe 6 Flow control valve 7 gas discharge pipe 8 switching valve 9 Bypass pipe 10 cushion tank 11 Pressure sensor 12 Pressure reducing valve 13 Check valve

Continuation of front page (56) Reference JP-A-61-174368 (JP, A) JP-A-4-308071 (JP, A) JP-A 58-93863 (JP, A) JP-A-61-149470 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C23C 2/18 C23C 2/38

Claims (2)

(57) [Claims] 1. A wire rod plating apparatus comprising a plurality of gas throttle parts for controlling a plating thickness by spraying a non-oxidizing gas on a surface of the wire rod when the wire rod is immersed in a plating tank and pulled up, A cushion for preventing pressure fluctuations in the gas supply pipe that supplies non-oxidizing gas to the gas throttle unit.
The tank side, and at the output side of the cushion tank
A pressure sensor is installed and a flow control valve is installed from the cushion tank.
The provided gas exhaust pipe is branched so that the output of the pressure sensor
A wire rod plating apparatus in which the opening of the flow control valve is controlled so as to show a constant value, and non-oxidizing gas corresponding to an unused gas throttle is diverted to the gas discharge pipe. 2. A heat generating gas generator provided as a non-oxidizing gas source is provided with a bypass pipe provided in parallel with a switching valve, and the heat generating gas generator replaces the heat generating gas when the heat generating gas generator is stopped. The wire rod plating apparatus according to claim 1 , wherein the raw material gas is supplied to the gas throttle portion.