JPH0348202Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" This invention relates to a heating furnace, for example, a heating furnace installed in thick plate equipment, hot rolling equipment, etc. in the iron manufacturing process.

``Prior Art'' As this type of heating furnace, one equipped with a combustion tube as shown in FIGS. 3 and 4 is conventionally known. This heating furnace is equipped with a plurality of burners 2 at predetermined intervals on both side walls 1a, 1a of a heating furnace main body 1, and flames and combustion gas from the burners 2 are supported by supports 3 below the main body 1. By passing it through a combustion tube 4 provided in a cylindrical shape, the objects to be heated 5, 5 are heated from below by radiant heat from the outer surface of the combustion tube 4. The materials for forming the above-mentioned combustion tube 4 are as follows:
Ceramic is generally used because heat resistance is required.

In this heating furnace, the objects to be heated 5, 5 are carried into the main body 1 from the entrance 7 by a conveyor 6, and then transported by a walking beam system or pusher system installed in the main body 1. A mechanism (not shown) transfers the material to the front side (to the left in FIG. 4) in a direction perpendicular to the plane of the paper in FIG. 3 and heats the material. ).
In the example shown in FIGS. 3 and 4, the two objects to be heated 5 and 5 are transferred side by side, and therefore the conveyor 6 and the transfer mechanism (not shown) are also Two sets of each are provided.

As shown in FIG. 4, the above-mentioned carrier 6 has two arms 8, 8 which are movable in the front-rear direction (left-right direction in FIG. 4) and whose tips 8a can be inserted into the main body 1. By placing the heated object 5 on the tips 8a, 8a of the arms 8, 8 and inserting it into the main body 1, the heated object 5 is carried into the main body 1 through the loading port 7. and is delivered to the above-mentioned transfer mechanism (not shown). The arms 8, 8 of the carrier 6 are generally made of heat-resistant metal so as to withstand the high temperature inside the furnace.
Although not shown in the drawings, two sets of conveyors similar to those described above are also provided at the exit, and are configured to transport the heated objects 5, 5 from the main body 1. Further, in FIG. 4, reference numeral 9 is a door for opening and closing the loading port 7, and a similar door is also provided at the loading port.

According to this heating furnace, the object to be heated 5 can be heated continuously and also heated indirectly by the combustion tube 4, so that the object to be heated 5 can be heated uniformly in the width direction. It has the advantage of being done.

"Problems to be Solved by the Invention" However, in the conventional heating furnace described above, there was a problem in that the ceramic forming the combustion tube 4 was prone to cracking due to the following reasons.

In other words, the object to be heated 5 is carried in (or carried out)
Since the arm 8 of the conveyor 6 for carrying out the transfer is normally located outside the main body 1, its temperature is approximately normal temperature, which is extremely low compared to the temperature inside the main body 1. Therefore, when this low-temperature arm 8 is inserted into the main body 1 and positioned near the high-temperature combustion tube 4 (the state shown in FIG. 4),
The combustion tube 4 is rapidly cooled by the arm 8, resulting in a local temperature drop and being subjected to a large thermal shock. When subjected to such thermal shock, ceramic materials generally have extremely good heat resistance against constant high temperatures, but their thermal shock resistance is low, so they will crack relatively easily. be.

For this reason, conventionally, the life of the combustion tube 4 made of ceramic material is relatively short, and the combustion tube 4 is also expensive.
This has caused problems such as secondary damage to various equipment such as a transfer mechanism provided within the main body 1 due to the damage.

In order to solve the above-mentioned problems, it has been considered to form the combustion tube 4 using a ceramic material with excellent thermal shock resistance. Currently, ceramic materials with
It has been desired to provide a means for preventing the ceramic combustion tube 4 from cracking.

``Means for solving the problems'' In order to solve the above problems, this invention
The heating furnace body has a combustion tube formed of ceramic material inside, and has an arm whose tip can be inserted into the heating furnace body, and the object to be heated is carried into the heating furnace body by the arm. or a heating furnace configured to heat an object to be heated in the heating furnace main body by the combustion tube, the heating furnace comprising: a conveyor for carrying out the work from the heating furnace main body; It is characterized by a heat insulating material attached to the surface of the part inserted into the heating furnace body.

``Function'' In the heating furnace of this invention, the heat insulating material attached to the arm of the carrier acts as a thermal buffer, mitigating thermal shock to the combustion tube.

``Example'' An example of this invention will be described below in Figures 1 and 2.
This will be explained with reference to the figures. Components in the heating furnace of this embodiment that are the same as those in the conventional heating furnace described above are designated by the same reference numerals in FIGS. 1 and 2 as in FIGS. 3 and 4, and a description thereof will be omitted.

The heating furnace of this embodiment differs from the conventional heating furnace described above in that a heat insulating material 10 is attached to the tips 8a, 8a of each arm 8, 8 of the conveyor 6. As shown in FIG. 2, this heat insulating material 10 is provided at a portion located inside the main body 1 when the arms 8, 8 are inserted into the main body 1, and a portion located slightly outside the loading port 7. As shown in FIG. 1, it is attached so as to cover both side surfaces and the lower surface of the arms 8, 8. As the material for the heat insulating material 10, it is desirable to use a material having sufficient heat resistance, such as ceramic fiber or ceramic board.

By attaching the heat insulating material 10 to the arm 8 of the carrier 6 in this way, the heat insulating material 10 serves as a thermal buffer, and the tip 8a of the arm 8 is attached to the main body 1.
Thermal shock to the combustion tube 4 that occurs when the combustion tube 4 is inserted into the combustion chamber is sufficiently alleviated, preventing cracks from occurring in the combustion tube 4, and extending its life. Therefore, the effort and cost required for maintenance can be significantly reduced, and since the structure is extremely simple, just attaching the heat insulating material 10, the equipment cost will not increase.

Further, by attaching the heat insulating material 10, the temperature rise of the arm 8 itself is suppressed, so that thermal deformation of the arm 8 itself can be prevented, and heat loss through the arm 8 can also be reduced.

In the above embodiment, the heat insulating material 10 is not attached to the upper surface of the arm 8, which is the part that is in direct contact with the heated object 5, but this is not necessarily the case, and the heat insulating material 10 is not attached to the upper surface. A material may be attached to cover the entire surface of the arm 8. Furthermore, it is of course possible to attach the heat insulating material 10 not only to the tip end 8a of the arm 8 but also over its entire length. Furthermore, since this invention only requires attaching a heat insulating material to the arm, an existing heating furnace can be easily modified without requiring much cost.

``Effects of the invention'' As explained in detail above, according to this invention, a heat insulating material is attached to the surface of at least the part of the arm of the conveyor that is inserted into the heating furnace body, so that the ceramic combustion tube receives the heat from the arm. Thermal shock is alleviated, cracking of the combustion tube can be prevented, and the life of the ceramic combustion tube can therefore be extended. Moreover, the temperature rise of the arm itself is suppressed, and thermal deformation thereof can be prevented, and heat loss through the arm can also be reduced.

[Brief explanation of the drawing]

FIGS. 1 and 2 schematically show the construction of a heating furnace according to an embodiment of this invention, with FIG. 1 being a front sectional view and FIG. 2 being a partial side sectional view. Figures 3 and 4 show the schematic configuration of a conventional heating furnace.
FIG. 3 is a front sectional view, and FIG. 4 is a partial side sectional view. DESCRIPTION OF SYMBOLS 1... Heating furnace main body, 4... Combustion cylinder, 5... To be heated, 6... Conveyor, 8... Arm, 8a... Tip part, 10... Heat insulating material.

Claims (1)

[Scope of utility model registration request] The heating furnace body has a combustion tube formed of ceramic material inside, and has an arm whose tip can be inserted into the heating furnace body, and the object to be heated is carried into the heating furnace body by the arm. or a heating furnace configured to heat an object to be heated in the heating furnace main body by the combustion tube, the heating furnace comprising: a conveyor for carrying out the work from the heating furnace main body; A heating furnace characterized in that a heat insulating material is attached to the surface of the part inserted into the heating furnace main body.