JPS6212286B2 - - 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.
There is an electric furnace in which a heater 1 as shown in FIG. 1 is installed in a heating furnace 2, or an induction heating furnace in which a heating coil 3 is installed as shown in FIG. 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 top cover 4 is removed and the steel material 5 is gripped with tongs 6, and the tongs 6 hold the wire 7. It was suspended from hook 8 of the crane.

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 large. ,
b and c, which are different, making uniform heating difficult.

(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, there is no support mechanism for the steel material, so as shown in Figure 3A, the steel material may fall over and destroy the heating furnace. There were also many safety issues.
The reason for not installing a steel support mechanism is the third reason.
This is because, as shown in Figure B, when attempting to support a steel material, the supporting member is necessarily heated to a high temperature along with the steel material inside the heating furnace, which causes problems in terms of strength.

(ii) As shown in Figure 3B, when a steel material is heated to a high temperature while standing on its own, the high temperature strength of the steel material decreases, resulting in buckling as shown in Figure 3B. Not only was it impossible to transport, but it also had the problem of not being able to be used as a product.

The present invention eliminates all of the above-mentioned conventional drawbacks, improves the positioning accuracy of steel materials, enables uniform heating of steel materials, securely clamps steel materials, and charges the steel materials without turning them upside down. It is an object of the present invention to provide a batch-type heating device for steel materials that can prevent buckling of steel materials.

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 longitudinal side walls 20, 2
An induction heating coil 3 is built into the inside of the coil 0', and steel support plates 21 made of non-magnetic refractory material such as ceramic are provided on the inner surfaces of both side walls 20 and 20'.
21' is installed extending from the upper surface to slightly above the lower end and is fixed to the side walls 20, 20', respectively, with embedded bolts (not shown) or the like. Both steel support plates 21, 21' are provided with clamp movement grooves 22, 22, 22', 22' in the vertical direction at both ends thereof, respectively. Then, introduction holes 23, 23' for introducing both the floor parts 13, 13' of the hearth 11 are formed by cutting rectangular holes from the lower surface position of the steel material support plate 21 of the side wall 20 to the lower end thereof, and 13, 13' can be moved in and out, and the side wall 20' also has a central floor portion 16, both side floor portions 17, and Introduction holes 24, 24', 2 for introducing 17'
4'' into a rectangular notch, and the central floor portion 16
And both side floor parts 17, 17' are designed to be accessible.

Also, a guide plate 2 is installed below both short sides of the heating furnace 2'.
5 and 25' are fixed vertically to guide the steel material charging device 26. This steel charging device 2
6 is composed of a steel material clamping device 27 and a lifting device 28. The steel material clamping device 27 is the fourth,
It is configured as shown in Figures 5 and 8. That is, the substantially piece-shaped base 29 has protrusions 30, 30' at both ends.
are provided on the upper surface facing each other, and a plurality of wheels 31, . . . 31', . Sliding guide grooves 32, 32' are provided horizontally on the inner surfaces of the protrusions 30, 30', and a support 33 is provided protruding integrally with the base 29 at the center of the inner side. This support stand 33 is connected to the hearth 1 as shown in FIG.
Support portions 34, 34' are made to protrude from the upper surface only at locations corresponding to the engagement grooves 15, 15'. or,
On the parallel front and rear sides of the support base 33, rectangular sliders 35, 35' are slidably provided, the ends of which fit into the sliding guide grooves 32, 32' on both sides. As shown in FIGS. 4 and 5, the sliders 35 and 35' are provided with through grooves 36 and 36' at the lower center end, respectively, and nuts 37 and 37' are fixed in the centers of the through grooves 36 and 36', respectively. There are two clamping members 3 inside each end.
8, 38, 38', and 38' are opposed to each other and protrude from the upper surface. The operating screw rod 40 is horizontally supported by bearings 39 and 39' fixed at the center of the support stand 33 and at the front and rear of the base 29. This operating screw rod 40
The front and back spirals in opposite directions to form a nut 3.
7 and 37', and one end of the operating screw rod 40 is connected to a reversible motor 42 via a coupling ring 41.

Further, the lifting device 28 is formed of a trunnion-shaped cylinder, and is connected to the center of the lower surface of the base 29 to raise and lower the steel material charging device 26.

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, the steel material 5 is placed on the support parts 34 and 34' formed on the support stand 33 of the base 29, and the reversible motor 4
2 in the forward direction to rotate the actuating screw rod 40, and move the movers 35, 3 through the nuts 37, 37'.
5' is moved to the center side (towards the support base 33) by the guide of both sliding guide grooves 32, 32', and the steel material 5 is moved as shown in FIG. Hold it in the center position to prevent it from tipping over.

In the above state, the lifting device 28 is driven to the exit side to raise the base 29 in the direction shown by arrow h, and the steel material 5 is charged into the heating furnace 2' so that the lower surface of the steel material 5 is higher than the upper surface of the introduction hole 21. Stop when it is located slightly above.

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, both support parts 3 of the support stand 33
4 and 34' are located within both engaging grooves 15 and 15'.

Next, the reversible motor 42 is driven in the opposite direction to open each clamping member 38, 38, 38'38' to position d shown by the chain line in FIG. 7, and the steel member 5 is opened. After that, when the lifting device 28 is driven toward the entry side and the base 29 is lowered in the direction shown by the arrow h', both the supporting parts 34, 34' are moved into the engaging groove 15, as described above.
15', there is nothing to prevent the base 29 from descending, and the base 29 descends smoothly. Its base 29
As the steel material 5 descends, the steel material 5 moves to the center floor 16 of the hearth 11'.
and is transferred to the floor sections 17, 17' on both sides, and the base 29
The chisel is lowered and left in its 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 center floor part 16 mesh with each other, thereby sealing the lower side of the heating furnace 2'.

In the above state, the steel material 5 is heated by induction heating. At this time, the steel material 5 is the steel material support plate 21, 2
1, the progress of buckling is prevented even if it is heated to a high temperature and starts buckling.

When taking out the steel material 5 from the heating furnace 2', the operation order can be reversed; open the hearth 11,
The base 29 is raised to transfer the steel material 5 onto the supports 34, 34', and then the clamping members 38, 38' are closed as shown by e in FIG. 6 to clamp the steel material 5, and the hearth 11 After opening, the base 29 is lowered.

In the above embodiments, an induction heating furnace is used, but this is most suitable for uniformly heating steel materials, and heating by gas or electricity is also suitable.

Further, although the steel support plates 21 and 21' are made of non-magnetic material, this is because they are not heated by induction heating, and if this is ignored, magnetic material may also be used.

The present invention has the above-described structure and function, and the steel material 5 can be charged from the bottom and centered at the center of the heating furnace. Therefore, it is possible to reduce the heating unit and uniformly heat the steel material, and moreover, it is possible to safely and reliably insert and remove the steel material without overturning the steel material, and to prevent buckling of the steel material during high-temperature heating. be able to.

[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.
- An enlarged cross-sectional view of the V line, Figure 6 is of Figure 4 -
7 is a cross-sectional view taken along the - line in FIG. 4 with the hearth removed, and FIG. 8 is a cross-sectional view taken along the - line 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, 21, 21' are steel support plates, 27 is a steel clamp device, 28 is a lifting device, 29 is a base,
34, 34' are supporting parts, and 38, 38' are clamping members.

Claims (1)

[Claims] 1 Open lower side and opposing longitudinal side walls 2
The heating furnace 2' has steel material support plates 21, 21' provided on the inner surface thereof from the upper surface to the lower end to support the side surfaces of the steel material 5, and the lower opening of the heating furnace 2' that moves horizontally. A pair of comb-shaped hearths 11, 11' with protruding floor parts that interlock with each other and open and close.
and two pieces supporting the lower surface of the steel material 5 which rise to insert the steel material 5 when the lower opening of the heating furnace 2' is opened, and which rise to receive the steel material 5 when one of the hearths 11 opens. Support parts 34, 34' are provided protruding from the base 29 so as to be located between the floor parts of the other hearth 11', and the sides of the steel material 5 are held on the respective sides of both the support parts 34, 34' by opening and closing. Clamping members 38, 38'
This is a batch type heating device for steel materials, which comprises a steel material clamping device 27 that is provided facing each other, and a lifting device 28 that moves the steel material clamping device 27 up and down with respect to a heating furnace 2'.