JPH021891B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a beam of a walking beam type heating furnace for heat-treating a material in the furnace.

(Prior art and its problems) Conventionally, in high-temperature heating walking beam furnaces, as shown in FIG. There is.

The fixed beam is formed hollow in order to prevent strength deterioration due to the high temperature inside the furnace, and is configured to be cooled by circulating cooling water through the hollow interior 2 to maintain its strength. The entire surface of the fixed beam 1 is covered with a heat insulating material 5 to prevent the absorption of thermal energy in the atmosphere from the surface of the fixed beam 1 and to prevent the temperature of the furnace atmosphere gas from decreasing due to cooling. Since the receiving fitting 3 is in direct contact with and fixed to the fixed beam 1, the thermal energy received by the atmospheric gas is conducted through the receiving fitting 3 and absorbed by the cooling water flowing inside the fixed beam 1.

Therefore, the temperature of the processing material receiving fitting 3 becomes lower than the atmospheric gas temperature, and the amount of heat dissipated to the cooling water in the fixed beam 1 is large due to the good thermal conductivity of this receiving fitting 3. The temperature of the material to be treated becomes lower than the set temperature increase time for the material to be treated, and there is a delay in temperature rise at the contact area between the material to be treated and the receiving metal fitting 3, and the temperature of the entire material to be treated is not uniformly raised, resulting in uneven heating. There were other problems.

Considering this point, if the flow rate of the cooling water flowing through the hollow interior of the fixed beam 1 is reduced, the temperature of the fixed beam 1 will rise abnormally, and the cooling water will heat up and evaporate, causing damage to the fixed beam 1. .

The present invention solves these problems and provides a walking beam type heating system that aims to improve the quality of the material by eliminating uneven temperature rise of the material to be processed due to a delay in temperature rise at the contact area between the material to be processed and the receiving metal fitting. It provides a fixed beam for the furnace.

(Structure of the Invention) In order to achieve the above object, the beam of the walking beam type heating furnace according to the present invention is mainly made of a hollow beam whose surface is covered with a heat insulating material. In the beam of a walking beam heating furnace, in which the lower ends of a plurality of processing material receiving fittings are brought into contact with and fixed to the main body of the beam, heat-resistant steel pipes are inserted through the plurality of material receiving fittings. , is characterized in that it is configured to allow high-pressure gas to flow through the heat-resistant steel pipe.

(Function) The material receiving metal fittings, which are heated by the temperature of the gas in the furnace atmosphere, are cooled by the cooling water flowing through the hollow interior of the beam body, but are cooled by the high temperature gas flowing in the heat-resistant steel pipes that pass through the receiving metal fittings. This cancels out the cooling effect, so that the contact area between the receiving metal fitting and the treated material is always at the same temperature as the heated treated material or at a slightly higher temperature.

(Example) To explain an example of the present invention with reference to the drawings, 1
The main body of the fixed beam is installed in parallel with the movable beam 7 in the furnace 10, and the inside is formed hollow over the entire length, and is configured to allow cooling water to flow through the hollow interior 2. The entire surface is covered with a layer of heat insulating material 5 to an appropriate thickness.

3, 3...3 are receiving metal fittings made of a material with high thermal conductivity that are integrally fixed with their lower ends in contact with the upper surface of the fixed beam main body 1, and are fixed in the length direction of the fixed beam main body 1. Heat-resistant steel pipes are arranged at intervals, with through holes 6 drilled between opposing surfaces, and arranged in parallel in the length direction of the fixed beam main body 1 in the through holes 6 of these receiving fittings 3. 4 has been inserted.

The outer circumferential surface of the heat-resistant steel pipe 4 is in contact with the inner circumferential surface of the through hole 6 of each receiving metal fitting 3, and the receiving metal fitting 3 is heated by the high pressure gas flowing inside the tube.

As shown in FIG. 3, the heating furnace 10 has a group of feed rollers 8 and a group of feed rollers 9 disposed on the material inlet and outlet sides, respectively, and the feed roller group 8 transfers the material into the furnace. The treated material a is sequentially transferred by the moving beam 7 onto the receiving metal fitting 3 erected on the fixed beam main body 1, and after being heat-treated while moving in the furnace, it is transferred by the feed roller group 9. It is carried out of the furnace.

In the process of processing such materials, the fixed beam main body 1 allows cooling water to flow through its hollow interior 2 to prevent the temperature from rising through the heat insulating material 5 due to the temperature of the furnace atmosphere gas.

On the other hand, the receiving metal fitting 3 is directly heated by the furnace atmosphere, but since its lower surface is in contact with the fixed beam main body 1, it receives a cooling effect from the fixed beam main body 1 side, and the contact part with the processing material a The temperature decreases, causing a delay in temperature rise of the material to be treated.

Therefore, in the present invention, as described above, the heat-resistant steel pipe 4 is passed through the receiving metal fitting 3, and high pressure gas is passed through the heat-resistant steel pipe 4 to heat the receiving metal fitting 3, thereby reducing the contact portion with the processing material a. The material is heated by the furnace atmosphere gas to a temperature equal to or slightly higher than that of the material, and the fixed beam main body 1 can be sufficiently cooled.

Note that the present invention is applicable not only to fixed beams but also to moving beams.

(Effects of the Invention) As described above, according to the beam of the walking beam type heating furnace according to the present invention, a heat-resistant steel pipe is installed to penetrate the material receiving metal fitting fixed to the main body of the beam. Since it is configured to allow high-pressure gas to flow through it, the receiving metal fitting is forcibly heated by the high-temperature gas flowing inside the heat-resistant steel pipe, and the contact area of the treatment material is made to have the same temperature or slightly high temperature as the temperature-raising treatment material. Therefore, the contact area of the treated material can be heated at a uniform temperature with other parts heated at the furnace atmosphere gas temperature, resulting in good heating efficiency.
It is possible to improve the quality of the treated material.

Furthermore, the amount of heat dissipated from the heat-resistant steel pipe passing through the receiving fitting prevents the temperature of the furnace atmosphere gas from dropping in the vicinity of the fixed beam, allowing the material to be processed to be processed uniformly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the fixed beam, Fig. 2 is an enlarged longitudinal sectional front view thereof, Fig. 3 is a plan view of the interior of the furnace, and Fig. 4 is a conventional receiving metal fitting. FIG. 1...Fixed beam main body, 2...Hollow part, 3...
Treated material receiving metal fitting, 4...Heat-resistant steel pipe, 5...Insulating material.

Claims (1)

[Claims] 1 Cooling water is circulated through the hollow interior of a hollow beam main body whose surface is covered with a heat insulating material to cool the beam main body, and the lower ends of a plurality of processing material receiving fittings are contacted and fixed to the beam main body. A walking beam heating furnace characterized in that the beam of the walking beam heating furnace is configured such that a heat resistant steel pipe is inserted through the plurality of material receiving metal fittings, and high temperature gas is circulated within the heat resistant steel pipe. Furnace beam.