JPS595727Y2 - Skid for walking beam type heating furnace - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a skid attached to a water-cooled beam for transporting materials in a walking beam heating furnace.

The skids of conventional walking beam heating furnaces are 1st and 2nd.
As shown in the figure, a structure in which a number of skid rails b made of heat-resistant steel are welded in a straight line on a water-cooled beam a has been widely used.

This method is simple and economical, but because the skid rail is cooled by cooling water passing through the beam, the temperature of the contact surface of the heated object with the skid rail is lower than other parts, causing the heated object to A part called Schizdomer occurs.

Therefore, in order to heat this part to a temperature that does not interfere with rolling, the parts other than the skid marks are heated to a higher temperature than necessary, but this results in problems such as disadvantages in terms of basic unit or poor dimensional accuracy during rolling. was there.

The present invention has been made to eliminate the above-mentioned drawbacks, and will be explained below using examples.

In the skid shown in Figures 3 and 4, a saddle 2 is directly attached to a horizontal beam 1 by welding, and 3 is a bulge-shaped constant-section projection integrally formed in the width direction of the furnace on the upper surface of the saddle. Article, 4
is a stopper projecting from one end of the constant-section protrusion so as to be perpendicular thereto.

Reference numeral 5 denotes a skid rail made of super heat-resistant steel on which the heated object is mounted, and has a dovetail-shaped concave line 6 deeper than the height of the constant-section protrusion 3.
When the skid rail 5 is inserted into the concave groove 6 so that the skid rail 5 is placed on the saddle 2, it cannot be pulled out upward due to the engagement between the dovetail groove and the bulge. In addition, the upper surface of the ridge 3 of equal cross section and the inner wall surface of the skid rail are spaced 7 apart from each other.

Note that 8 indicates a retaining piece welded to the opposite side of the stopper 4 to prevent the skid rail 5 from slipping out.

Regarding the dimensions of the skid rail 5, it is desirable that the length be limited to approximately 150 mm based on the results of calculating the temperature and stress of each part, and that the width of the recessed line 6 be approximately approximately + of the length.

In addition, in terms of shape, as shown in the figure, the high temperature section avoids sudden changes in cross section to prevent the occurrence of cracks that often occur in conventional skid rails of this type.

It is well known that in conventional pushchair set heating furnaces, for example, skid rails can be replaced by inserting and removing pins, in which case cracks occur due to the concentration of thermal stress in that part due to the formation of pin holes. This was something that was difficult to avoid.

However, in the present invention, the above-mentioned structure eliminates sudden cross-sectional changes, so even if the skid rail 5 expands thermally, the constant-section protrusions 3 do not restrict the expansion, and therefore, excessive thermal stress is not applied and cracks occur. is largely eliminated.

In addition, since the equal-section protrusion 3 is shaped in the oven width direction, when replacing a skid rail that has been damaged due to a crack, etc., by removing the corresponding retaining piece 8, only the damaged skid rail can be moved in the oven width direction. You can remove the skid rail and insert a new skid rail, and there is no need to remove the skid rails that are attached on both sides and do not require replacement.

FIG. 5 shows that by inserting a heat insulating material 9 such as ceramic fiber into the space between the equal-section protrusion 3 and the inner wall surface of the skid rail 5, the radiation transfer between the upper surface of the equal-section protrusion 3 and the inner wall surface of the skid rail 5 is achieved. This was an attempt to reduce heat.

Furthermore, in FIG. 6, a heat insulating material 10 (ceramic paper) such as ceramic fiber is laid on both sides of the ridge 3 of equal cross section on the upper surface of the saddle 2, and a skid rail 5 is placed on the heat insulating material 10. The purpose is to suppress heat conduction in the area.

By taking such additional measures against heat conduction, the temperature on the upper surface of the skid rail 5 increases and the temperature of the saddle 2 can be kept lower, which eliminates skid marks and also makes the saddle 2 made of a low-grade material (for example, ordinary It also becomes possible to use cast steel.

In addition, FIG. 7 shows that a skid rail 12 having a bulge-shaped uniform cross-section protrusion 11 similar to the equal cross-section protrusion 3a and 3b is inserted between the equal cross-section protrusion 3a and 3b of the adjacent saddles 2a and 2b. Shows what is included.

As explained in the above embodiments, the skid for a walking beam reheating furnace according to the present invention has a high heat insulation effect between the saddle welded onto the beam and the skid rail, so it is extremely effective in reducing skid marks. At the same time, the occurrence of cracks in the skid rail due to thermal expansion is significantly reduced, and the skid rail can be easily replaced by itself, among other advantages.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a conventional skid, FIG. 2 is a cross-sectional view thereof, FIG. 3 is a perspective view showing an embodiment of the skid according to the present invention, FIG. 4 is a cross-sectional view thereof, and FIG. 7 through 7 are cross-sectional views of the skid. 1...Beam, 2...Saddle, 3...
・・・Equal cross-section protrusion, 5・・・Skied rail,
6...Concave groove, 7...Separation, 9,10
...Insulation material.

Claims (1)

[Scope of claim for utility model registration] l. A bulging ridge of equal cross section is formed in the width direction of the furnace on the upper surface of the saddle to be welded onto the beam, and a dovetail groove deeper than the height of the ridge of equal cross section is formed on the skid rail on which the heated object is mounted. A walking beam heating furnace characterized in that a concave groove is formed, and when the constant cross section protrusion is inserted into the concave groove, the upper surface of the constant cross section protrusion is separated from the inner wall surface of the skid rail. Skid for use. 2. A skid for a walking beam heating furnace according to claim 1, wherein a heat insulating material is inserted in a space between the constant-section protrusion and the inner wall surface of the skid rail. 3. A skid for a walking beam heating furnace according to claims 1 and 2 of the Utility Model registration claim, wherein a heat insulating material is laid on both sides of the equal-section protrusion on the upper surface of the saddle, and a skid rail is placed on the heat insulating material.