JPH0718752Y2 - Lead bath Patent bath Lead bath - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead bath of a lead bath patenting furnace.

[0002]

2. Description of the Related Art Conventionally, a lead bath in a lead bath patenting furnace is disclosed in, for example, Japanese Patent Laid-Open No.
As shown in FIG. 2 of Japanese Patent Laid-Open No. 26620, since the heating of the lead bath is a downward heating by the direct-burning type burner, the iron shell of the bath is oxidized and the life is short, and the bath temperature is 500 to 500.
The limit is 600 ° C. And, since the combustion chamber is arranged below the bathtub, a basic pit is required. Further, since the bath surface is open to the atmosphere, lead oxide is generated, and the wire rod passing through the lead bath is easily damaged. Furthermore, due to the presence of lead oxide,
There is a problem that the lead pump for circulating the lead bath cannot be used and the bath temperature cannot be made uniform. It is an object of the present invention to provide a lead bath of a lead bath patenting furnace which can solve the above problems with a simple configuration.

[0003]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a lead bath of a lead bath patenting furnace having a plurality of radiants on the lower side wall of the lead bath arranged adjacent to the heating furnace. The tubes are arranged at predetermined intervals in the furnace length direction, a cover is provided on the upper surface of the lead bath except the wire rod extraction port, and a gas supply pipe for supplying non-oxidizing gas is provided in the space between the cover and the bath surface. It is a thing.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a heating furnace of a lead bath patenting furnace, and 2 is a burner. Reference numeral 3 denotes a lead bath according to the present invention, which is arranged adjacent to the heating furnace 1 and has a radiant tube (burner) 5 located in the lead bath W at a lower portion of a side wall of the tank main body 4 at a predetermined interval in the furnace length direction. It is set up.

A cover 6 is provided on the upper part of the tank body 4.
Is disposed, for example, via a sand seal, and is covered except the extraction port 9 of the wire rod S. The cover 6 is provided with a gas supply pipe 7 for supplying a non-oxidizing gas such as N ₂ into a space R formed between the bath surface of the lead bath W of the tank body 4 and the cover 6. And a lead agitation pump 8 for agitating the lead bath W is installed. A seal box 10 connects the heating furnace 1 and the lead bath 3 with each other.

In the lead bath 3, the lead bath W is maintained at a predetermined temperature of 650 ° C. or less by direct heating of the radiant tube 5, while the non-oxidizing gas is supplied into the space R and the stir pump 8 is used to lead the lead. The bath W is agitated to a uniform temperature, and the wire S is passed through the lead bath W as in the conventional case.

When the lead bath temperature is lowered due to changes in the processing conditions of the wire rod S, cooling air is supplied into the radiant tube 5 and used as a cooling pipe to promptly lower the lead bath temperature to a predetermined temperature. You may do it.

[0008]

[Effect of the Invention] As is clear from the above description, according to the present invention, the lead bath is heated by the radiant tube arranged in the lead bath, so that the heat efficiency is better and the heating time is shortened compared to the conventional one. Not only can you heat up the bath temperature to 650 ℃,
It can be adapted to various processing conditions of the wire. Moreover, since the bathtub is not directly heated, the life of the bathtub can be greatly improved, and since the combustion chamber is not provided below the bathtub, the foundation pit is not required.

Further, since the bath is covered with a cover except for the wire rod extraction port, and a non-oxidizing gas is supplied to the space between the bath surface and the cover, the lead bath is not oxidized and the lead oxide prevents the wire rod from being oxidized. The damage can be prevented and the consumption of lead can be greatly reduced. Furthermore, since lead oxide is not generated, it is possible to stir the lead bath with a lead pump,
The bath temperature can be made uniform, and the heat treatment effect of the wire can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a lead bath of a lead bath patenting furnace according to the present invention.

FIG. 2 is a partial cross-sectional view of FIG.

[Explanation of symbols]

3 ... Lead bath, 4 ... Tank body, 5 ... Radiant tube, 6
... Cover, 7 ... Gas supply pipe, 9 ... Extraction port, R ... Space, S
… Wire, W… Lead bath.

Claims (1)

[Scope of utility model registration request] 1. A plurality of radiant tubes are arranged below a side wall of a lead bath of a lead bath patenting furnace at predetermined intervals in a furnace length direction, and a cover is provided on an upper surface of the lead bath except a wire rod extraction port. A lead bath of a lead bath patenting furnace, characterized in that a gas supply pipe for supplying non-oxidizing gas is provided in the space between the cover and the bath surface.