JPH0519753Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a heat shield structure for the hearth opening of a walking beam heating furnace, and in particular to a heat shield for suppressing heat loss from the hearth opening. Regarding structure.

[Prior Art] Generally, the hearth of a walking beam heating furnace is provided with an opening through which a movable post can pass freely.

As shown in FIG. 5, the hearth opening 1 is formed in the shape of a long hole whose longitudinal direction is along the transfer direction of the movable post 2 that moves in a rectangular orbit. A water seal mechanism 3 is provided below the opening 1 to appropriately discharge scale (oxide) falling into the water tank 4. Therefore, since the furnace interior 5 and the water seal mechanism 3 communicate with each other at the opening 1 position, a heat loss occurs in which heat in the furnace interior 5 is lost.

Therefore, in recent years, various heat shields have been proposed to prevent this heat loss.

As shown in FIG. 6, for example, this heat shield 6
A refractory 7 formed to cover the opening 1 in the longitudinal direction A is attached to the movable post 2 by a support shell 8 made of heat-resistant metal or ceramic material. be. That is,
By forming the parts exposed to high temperatures with the refractory material 7, heat output to the outside of the furnace is shielded, and heat loss due to the shield itself is prevented.

[Problems to be solved by the invention] However, in the conventional configuration described above, when the refractory 7 is exposed to high temperatures for a long period of time, it cracks and falls mainly due to its own weight, and both ends 9 in the longitudinal direction A sag. There was a problem in that the shaking interfered with the hearth 10, resulting in a reduction in the transfer function or damage to the parts.

On the other hand, as a heat shield that does not use refractories, there is one disclosed, for example, in ``Hearth Opening Insulation Device for Walking Beam Type Continuous Heating Furnace'' (Japanese Utility Model Publication No. 32103/1983).

In this configuration, laminated plates made of ceramic fibers are stacked one on top of the other and attached to a moving post by means of a support pipe passing through them. In this way, the shield will be lightweight, and the problem caused by its own weight will be solved.

However, in this case, the strength of the support pipes and laminate plates is an issue, and it is thought that issues regarding durability remain.

Therefore, the present invention was devised to reduce the weight of the heat shield and provide a structure that takes into account its durability.

[Means for Solving the Problems] The present invention consists of laminated plates made of ceramic fibers formed along the longitudinal direction of the hearth opening through which the movable post loosely passes, and stacked in a direction transverse to the longitudinal direction. A restraining pin rod made of ceramic is formed, and support members made of heat-resistant metal into which the pin rod is inserted are stretched on both ends of the moving post in the longitudinal direction.

[Function] With the above configuration, the laminated plate thermally shields the lower part of the hearth from the heating furnace, suppresses heat loss, and generates a desired vertical strength along the longitudinal direction.
The support member holds this lightweight laminate via the pin rod without exposing itself to high temperatures.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 4 show an embodiment of the hearth opening heat shield structure of a walking beam heating furnace according to the present invention. It is attached to a predetermined position of the moving post 2. This heat shield mainly consists of a ceramic fiber laminate 11 formed along the longitudinal direction A of the hearth opening 1, and a ceramic fiber laminate 11 that overlaps and restrains the laminate 11 in a direction transverse to the longitudinal direction A. The support member 13 is provided on the movable post 2 in a detachable manner, into which the pin rod 12 is inserted.

The laminated plates 11 have a thickness and length that cover the opening 1 when a predetermined number of laminated plates are stacked on top of each other, and have a height (such that the desired strength is produced when vertically erected). width). Further, the upper corner portion 14 is cut out in a tapered shape so that the falling scale S does not accumulate excessively. In this embodiment, it is formed symmetrically so that it can be divided into two blocks in the middle of the longitudinal direction A.

A total of ten pin rods 12 are provided with a length to penetrate through the stacked laminate plates 11, and are restrained by tightening nuts at the outer end surfaces of the laminate plates 11 at both ends thereof. .

The support member 13 is made of heat-resistant metal, and includes a mounting portion 15 that wraps around the movable post 2, and a longitudinal direction A from the mounting portion 15.
It has rib portions 16 extending to both sides. The mounting portion 15 is split in half in the middle in the longitudinal direction A, and is provided with a flange 17 for bolting together. Rib portion 16
It is made up of two plates 18 having the same shape as the laminated plate 11 but with a reduced area, and has an insertion hole 19 for inserting the pin rod 12 therethrough. Also,
A heat-resistant steel pipe 20 is inserted into the insertion hole 19 between the two plates 18.
The pin rod 12 is provided across the gap to reinforce the pin rod 12 inserted therethrough. The rib portion 16 is provided toward the center of the mounting portion 1.
5 and is isolated from the outside by a laminated plate 11. Further, a stopper 21 fixed to the moving post 2 is engaged with the lower end of the mounting portion 15 to hold it in a predetermined position.

In addition, the outer surface of the stacked laminated plates 11 is covered with a corrosion-resistant ceramic sheet 22 so as not to be corroded by the falling scale S.

Note that the movable post 2 is equipped with refractory material 2 as before.
3 is provided around the periphery, and the end surface of the laminate plate 11 is aligned in a shape along the outer peripheral surface of the refractory material 23.

Next, the operation of this embodiment will be explained.

Heat attempting to exit the furnace through the hearth opening 1 is blocked by the laminated plate 11, reducing heat loss. The support member 13 holds the laminate 11 in place on the moving post 2 via the pin rod 12. At this time, the strength of the laminate 11 is exhibited in the force (bending stress) that resists the vertical load in the longitudinal direction, and the strength (shearing stress) along the overlapping surfaces, which is the weakest direction, is reinforced by the pin rods 12. At the same time, it is supported by the support member 13.

Since the heat shield is made of ceramic fiber in this manner, weight reduction is achieved. Since the stacking direction of the laminated plates 11 is set to cross the longitudinal direction A of the opening 1, the structure is strong in the longitudinal direction A, and even if exposed to high temperatures for a long period of time, both ends will not sag. Deformation is prevented. The pin rods 12 that pass through the laminated plates 11 are shorter than if they were stacked longitudinally, reducing the required strength. In addition, the support member 13
is not exposed to high temperatures, can be formed as a strong and simple member, and can also be expected to have a cooling effect with the cooling water of the moving post 2.

Furthermore, since the structure is such that it can be attached to and detached from the moving post 2, it is easy to replace it, and since only the relatively inexpensive laminate plate 11 is replaced, maintenance costs can be reduced.

Note that when applied to a low temperature furnace, the support member 13
It is also effective to provide a heat shield between the moving post 2 and the movable post 2. Furthermore, the corner portions 14 of the laminated plate 11 may have a shape that prevents scale S accumulation, such as a semicircular shape, in addition to a tapered shape.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

(1) Ceramic fiber laminates formed along the longitudinal direction of the hearth opening are stacked in a direction transverse to the longitudinal direction to form a ceramic pin rod that restrains them, and this pin rod is inserted. Since the support member made of heat-resistant metal is oriented toward the moving post, the weight of the heat shield can be reduced, and deformation along the longitudinal direction can be prevented, resulting in improved durability.

(2) Since the supporting members are stretched on both ends of the moving post in the longitudinal direction, it can be formed as a member that does not require excessive heat resistance, and the cost of the member can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a partially transparent perspective view showing an embodiment of the heat shield structure for the hearth opening of a walking beam heating furnace according to the present invention, Fig. 2 is a partially cutaway plan view thereof, and Fig. 3 is a side view thereof. Figure 4 is its front view,
FIG. 5 is a side sectional view of a main part of a conventional walking beam heating furnace, and FIG. 6 is a side sectional view showing a heat shield for the hearth opening. In the figure, 1 is a hearth opening, 11 is a laminated plate, 12 is a pin rod, 13 is a support member, and A is a longitudinal direction.

Claims (1)

[Scope of utility model registration request] Ceramic fiber laminates formed along the longitudinal direction of the hearth opening through which the movable post freely passes are stacked in a direction transverse to the longitudinal direction to form a ceramic pin rod that restrains the pin rod. A support member made of heat-resistant metal that is inserted into the
A heat shield structure for a hearth opening of a walking beam heating furnace, characterized in that the movable post is provided at both ends in the longitudinal direction.