JPS6212285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a batch type heating device for steel materials.

A conventional vertical batch type heating furnace for steel materials is shown in Figure 1A.
An electric furnace in which a heater 1 as shown in FIG. 1 is installed in a heating furnace 2, or a heating coil 3 as shown in FIG.
There is an induction heating furnace equipped with. Both heating furnaces are open at the top and covered with an upper lid 4 to heat the steel material 5.

As shown in FIG. 2, in the conventional heating furnace, when a steel material 5 is charged into the heating furnace 2 and heated, the upper cover 4 is removed and the steel material 5 is grasped with tongs 6.
was suspended from a crane hook 8 via a wire 7.

Conventional heating furnaces have had the following problems.

(1) Since steel is charged from the top of the heating furnace, when the top cover is removed, the inside of the furnace is cooled by the convection phenomenon in the furnace atmosphere, and during continuous operation, the basic unit of heat required for heating is reduced. growing.

(2) In the case of the induction heating furnace shown in FIG. needs to be made smaller. However, in the case of the conventional method, as shown in Fig. 2, since the steel material is transported by a crane, the positioning accuracy of placing the steel material 5 in the center of the heating furnace is poor, and the distance between the heating coil 3 and the steel material 5 is poor. but,
b and c, which are different, making it difficult to provide a uniform heating furnace.

(3) As shown in Figure 2, since steel materials are charged into the heating furnace using tongs, the dimension e of the tongs is generally larger than the wall-to-wall dimension determined by the conditions on the heating furnace side. It is necessary to considerably increase the internal dimension d, which increases the heating unit consumption.

As a means to solve the above problem, Fig. 3 A and B
A bottom-open heating furnace 2' shown in FIG. 1 is used. In this method, the steel material 5 is placed upright on a steel material charging table 9, and the steel material 5 is moved to the heating furnace 2' by an elevating device 10.
The steel material 5 was heated.

The lower open type mentioned above had the following problems.

(i) When the steel material is charged on the steel material charging table 9 in a free-standing manner, since there is no support mechanism for the steel material, vibrations during charging cause horizontal shaking, as shown in Figure 3A.
There were many safety issues, such as steel products falling over and destroying the heating furnace. The reason why a support mechanism for the steel material 5 is not installed is that, as shown in Fig. 3B, if the support mechanism S is used to support the steel material, the support mechanism S will necessarily be heated to a high temperature along with the steel material inside the heating furnace. This is because problems arise in terms of strength.

(ii) Since there is no support mechanism, steel materials may be charged in an inclined state, and the internal dimension d of the heating furnace cannot be made as narrow as shown in Fig. 3B.
If a steel material is heated to a high temperature while it is tipped over, the high-temperature strength of the steel material decreases, resulting in buckling as shown in Figure 3B, which not only makes it impossible to transport the heated steel material, but also makes it impossible to use it as a product. It contained points.

The present invention eliminates all of the above-mentioned conventional drawbacks, improves the positioning accuracy of steel materials, enables uniform heating of steel materials, and reliably charges steel materials with the steel materials upside down. The purpose is to provide.

The structure of the present invention will be explained in detail based on the embodiment shown in FIG. 4 and below. The heating furnace 2' uses a bottom open type. The lower opening is closed by two comb-shaped hearths 11, 11' that engage with each other. As shown in FIG. 6, one of the hearths 11 has an engaging groove 12 in the center, and floor parts 13, 13' are formed on both sides of the engaging groove 12. It is now located outside. Further, the hearth 11' is provided with meshing grooves 15, 15' that mesh with the floor parts 13, 13', so that both the meshing grooves 15,
a central floor portion 16 that engages with the engagement groove 12 between 15′;
is formed in the center, and the two floor portions 13, 13' are formed at both ends.
Both side floor portions 17, 17' are provided between the furnace walls and the furnace walls, and a connecting portion 18 connecting the respective floor portions 16, 17, 17' is located outside the furnace. Two trunnion-type cylinders 19, 19 are horizontally connected to the outside of the connecting portion 14 of the hearth 11, and the hearth 11 is horizontally moved in the directions of arrows g and g'.
Two trunnion-type cylinders 19', 19' are connected horizontally to the outside of the connecting part 18 of the hearth 1'.
1' is moved horizontally in the directions of arrows f and f'.

On the other hand, the heating furnace 2' has rectangular cutout introduction holes 21, 21' for introducing both the floor parts 13, 13' of the hearth 11 at the lower end of the longitudinal side wall 20,
The floor parts 13, 13' of the hearth 11 can be moved in and out, and the side wall 20' opposite to the side wall 20
There are a central floor portion 16 and both side floor portions 17 of the hearth 11'.
Introductory holes 22, 22', 22'' for introducing the hearth 17' are cut out in a rectangular shape so that the central floor portion 16 and both side floor portions 17, 17' of the hearth 11' can enter and exit.

Also, a guide plate 2 is installed below both short sides of the heating furnace 2'.
3 and 23' are fixed vertically to guide the steel material charging device 24. The steel material charging device 24 has supports 26 and 2 at positions on the longitudinal side of the base 25 that coincide with both engaging grooves 15 and 15' of the hearth 11.
6' protrudes toward the top surface, and both support stands 26, 2
Support parts 2 parallel to the longitudinal direction on the upper surface of 6′.
7 and 27' are provided protrudingly at intervals to form both support parts 2.
A steel material 5 is inserted and supported between 7 and 27. Then, guide plates 23 are provided on both end surfaces of the base 25,
A plurality of wheels 28, . . . run along 23'.
. . 28', . . . are attached, and a trunnion-shaped lifting cylinder 29 is attached to the lower center surface of the base 25, so that it can be moved up and down in the directions of arrows h and h'.

The present embodiment is constructed as described above, and when charging the steel material 5 into the heating furnace 2', the cylinders 19, 19 and 19', 19' are driven toward the loading side as shown in FIG. Then, the hearth 11, 11' is horizontally moved toward the arrows g', f' as shown by the chain lines, and the lower side of the heating furnace 2' is opened.

On the other hand, on both support stands 26 and 26' provided on the base 25 of the steel material charging device 24, there are support parts 27 and 2 on both sides.
7', the steel material 5 is placed in such a manner that it does not fall over and is positioned (see FIG. 5). At this time, the lower surface of the steel material 5 is in the position shown by A in FIG. It is charged into the heating furnace 2' and stopped at the position shown by A. In this state, the steel material 5 is located at the center of both side walls 20, 20'.

Next, one of the two cylinders 19, 19' is driven to the exit side to move the hearth 11' to the f side, so that the tips of the center floor part 16 and both side floor parts 17, 17' are aligned with the hearth wall 20.
When the cylinders 19 and 19' come into contact with each other, the driving of the cylinders 19 and 19' is stopped. At this time, the protruding supports 26, 26' of the base 25 are positioned within the engaging grooves 15, 15'.

Next, when the lifting cylinder 29 is driven to the entrance side and the base 25 is lowered in the direction shown by the arrow h', both the supports 26, 26' are moved to the engagement groove 15, as described above.
15', there is nothing to prevent the base 25 from descending, and the base 25 descends smoothly. and steel material 5
When the steel material 5 is lowered to the position shown by C on the lower surface, the steel material 5 is attached to the central floor portion 16 and both side floor portions 17 and 1 of the hearth 11'.
7', only the base 25 is lowered and stopped at the original position.

Next, when the other two cylinders 19, 19 are driven to the exit side and the hearth 11 is horizontally moved toward the arrow g side in FIG. The meshing grooves 15 and 15' mesh with each other, and the meshing groove 12 and the central floor portion 16 mesh with each other, thereby sealing the lower side of the heating furnace 2'. Then heating is performed.

When taking out the steel material 5 from inside the heating furnace 2', the order of operations may be reversed to that described above.

The present invention has the above-described configuration and function, and allows the steel material 5 to be charged from the bottom and centered at the center of the heating furnace. Therefore, the internal dimension d of the heating furnace can be narrowed, and even if the steel material charging device is lowered in the heating furnace and the steel material is released from the support part and then falls, the fall will cause damage to the furnace wall. The impact force applied is small and does not cause damage to the furnace wall. Furthermore, since the inclination after falling is small, buckling does not occur even if the steel material is heated to high temperatures. Therefore, it is possible to reduce the heating unit consumption and uniformly heat the steel material, and it is possible to perform heating that is excellent in terms of cost and quality.

[Brief explanation of the drawing]

Figures 1A and B are cross-sectional views of a conventional upper-open heating furnace, Figure 2 is a cross-sectional view showing the state of steel charging, and Figures 3 A and B are cross-sections of a conventional lower-open heating furnace. 4 is a vertical sectional view of an embodiment of the batch-type heating device for steel materials according to the present invention, and FIG.
6 is a cross-sectional view taken along the line -V in FIG. 4, and FIG. 7 is a cross-sectional view taken along the line -V in FIG. 4. In addition, in the figure, 2' is a heating furnace, 5 is a steel material, 11, 1
1' is a hearth, 13, 13', 16, 17, 17' are floor parts, 25 is a base, and 26, 26' are supports.

Claims (1)

[Claims] 1 A heating furnace 2' whose lower side is open, and a pair of comb-shaped hearths 1 with protruding floor parts that interlock with each other and move horizontally to open and close the lower opening of the heating furnace 2'.
1 and 11', and supports the lower surface of the steel material 5 which is raised to insert the steel material 5 when the lower opening of the heating furnace 2' is opened, and which is raised to receive the steel material 5 when one of the hearths 11 is opened. Two supporting stands 26, 26' are provided protruding from the base 25 so as to be located between the floor parts of the other hearth 11', and a steel material 5 is attached to both supporting stands 26, 26', respectively.
A batch type heating device for steel materials, comprising a steel material charging device 24 which is formed to be able to be raised and lowered with respect to a heating furnace 2' in which support portions 27, 27' that support the side surfaces of the heating furnace 2' are provided so as to protrude from each other.