JP3855348B2 - In-furnace conveying device for steel and method for carrying in steel into the furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In particular, in the field of steel bar manufacturing in steel mills, the present invention is a steel material conveying device in a heating furnace used for heating a steel material before hot rolling, performing a heat treatment for improving the quality of the steel material, and the like. The present invention relates to a method for carrying steel into a furnace, and provides a conveying apparatus and a carrying-in method that can be applied to both square-section steel (billet) and round-section steel (billet).
[0002]
[Prior art]
For example, in the case of wire rods and rods as strip steel products, billets that are raw materials are heated to a predetermined temperature in a heating furnace and then formed into target product dimensions by a rolling mill.
Here, when the heating furnace is of the walking beam system, billet, as illustrated in FIG. 6, mutually as well as extending parallel to the billet conveying direction A, in a direction perpendicular to the direction A The plurality of fixed skids a and movable skids b, which are alternately arranged, are sequentially conveyed from the inlet side to the outlet side of the heating furnace.
[0003]
By the way, this billet transport is provided with a plurality of workpiece receiving surfaces a1 and b1 at equal pitches in the billet transport direction A on both skids a and b, and the pitch between the skids a and b is also equal. However, the upward displacement of the movable skid b supports the billet B on the workpiece receiving surface b1 and lifts it from the fixed skid a. Then, the movable skid b is moved by one pitch of the workpiece receiving surface in the billet conveying direction A. The movable skid b is moved downward by a predetermined amount, and then the movable skid b is displaced downward, and the billet B on the work receiving surface b1 is transferred onto the work receiving surface a1 of the fixed skid a. By such an operation, the billet B is conveyed by one pitch of the workpiece receiving surface. Thereafter, the billet B is sequentially conveyed by repeatedly operating the movable skid b in the same manner as described above.
[0004]
For such billet conveyance, the shapes of the work receiving surfaces a1 and b1 provided on the skids a and b are as shown in FIG. 7A when the billet B has an angular cross-sectional shape as shown. as shown in), the billet B is no surface contact possible planar shape, when the billet B having a round cross-sectional shape, the same order makes it large enough contact interview with the work receiving surface, FIG. 7 ( It is common to have a substantially V shape as shown in b). This is because, for example, when a round cross-section billet is supported by a planar workpiece receiving surface, when the billet is heated, the billet is always in line contact with the skid, and the contact portion of the billet is deformed by the billet weight. This is substantially the same when the angular cross-section billet is supported by the V-shaped workpiece receiving surface, and is a device for preventing the billet from being deformed or wrinkled.
[0005]
[Problems to be solved by the invention]
Therefore, in the past, it has been necessary to install each heating furnace equipped with a skid with each workpiece receiving surface shape in a factory or the like that handles billets having the respective cross-sectional shapes as described above. There was a problem that both amounts increased greatly.
This invention was made as an object to solve such problems of the prior art, and the object of the invention is to provide a plurality of types of steel materials having different cross-sectional shapes for one heating furnace, Another object of the present invention is to provide a steel material in-furnace conveying apparatus and a steel material carrying-in method that can be smoothly conveyed without causing damage such as crushing deformation.
[0006]
[Means for Solving the Problems]
The steel material conveying device in the furnace of the present invention has a plurality of workpiece receiving surfaces at an equal pitch in the steel material conveying direction, and each of the fixed skid and the movable skid extending in parallel to each other in a direction orthogonal to the steel material conveying direction. An in-furnace conveyance device for steel materials arranged at intervals, each of a flat work receiving surface and a curved work receiving surface being spaced by half a pitch on each of a fixed skid and a movable skid . The planar workpiece receiving surface is formed as an inclined receiving surface whose height gradually decreases toward the curved workpiece receiving surface side .
[0007]
In this device, the steel material having an angular cross-sectional shape can be transferred by transferring the steel material between the flat work receiving surface of the movable skid and the flat work receiving surface of the fixed skid. The steel material can be transferred by transferring it between the curved workpiece receiving surface of the movable skid and the curved workpiece receiving surface of the fixed skid. Therefore, in this apparatus, a plurality of types of steel materials having different cross-sectional shapes can be transported smoothly and reliably in the furnace without causing damage such as deformation and wrinkles with one transport apparatus. It becomes possible to share these multiple types of steel materials, and each of the equipment cost and the fuel consumption can be effectively reduced.
[0008]
Contact name inclination angle β of such inclined receiving surface is preferably in the range of 3 to 20 °.
[0009]
Delete [0010]
In the method of carrying in the steel of the present invention , each of the skids is provided with a flat workpiece receiving surface and a curved workpiece receiving surface at intervals of a half pitch, and the planar workpiece receiving surface is provided, One steel material conveyed to a predetermined position on the charging table by the conveying device having an inclined receiving surface whose height is lowered toward the curved workpiece receiving surface side to the fixed skid as described above. Upon delivery, it also receives the steel on the inclined receiving surface of the movable skid, which is also displaced as described above, the square section steel on the inclined receiving surface, and the round section steel on the inclined receiving surface. Is supported on the curved workpiece receiving surface adjacent to the inclined receiving surface, and then the movable skid is moved by one pitch of the workpiece receiving surface in the advancing direction and moved downward. It is intended to hand over steel on the movable skid, on one of the inclined receiving surface or curved workpiece receiving surface of the stationary skids.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the drawings.
FIG. 1 is a plan view of an essential part showing an embodiment of the apparatus of the present invention.
In the figure, 1 indicates a charging table, 2 indicates a plurality of rollers disposed on the charging table 1 at predetermined intervals in the length direction thereof, and 3 indicates each of the rollers 2. The drive motor is shown.
Here, the rotational axis of each roller 2 is positioned at a slight angle θ toward one side with respect to the direction orthogonal to the longitudinal axis of the charging table 1, whereby each roller 2 is In addition, as a result, a steel material, for example, billet B, conveyed on the charging table 1 is placed along one of the side guides 1a and 1b provided on both sides of the charging table 1, along the side guide 1a in the figure. Transport.
[0012]
Now, one side guide 1a can be moved forward and backward with respect to the other side guide 1b under the action of the cylinder 4 connected thereto, and is brought to a position along the side guide 1a as shown in the figure. The billet B can be pressed and displaced toward the other side guide 1b. The charging table 1 shown here has a width corresponding to about two pitches of the arrangement pitch of the workpiece receiving surfaces described later, including both the side guides 1a and 1b. The workpiece receiving surface arrangement pitch between one of the positions along the one side guide 1a and the other position after it is pressed and displaced toward the other side guide 1b. Thus, a displacement equivalent to one pitch occurs.
By the way, the positioning of the billet B conveyed on the charging table 1 in the conveying direction can be performed by the stopper 5 provided on the charging table 1 so that the position can be changed or used selectively.
[0013]
In the heating furnace, each of the movable skid 6 and the fixed skid 7 extending in a direction orthogonal to the charging table 1 is disposed sufficiently close to the charging table 1. Here, each of the movable skid 6 and the fixed skid 7 is arranged at a predetermined interval in the length direction of the charging table 1, in other words, in the length direction of the billet B conveyed on the charging table 1. The arrangement of the movable skid 6 and the fixed skid 7 is alternately arranged, or any one of the skids is positioned every two or three with respect to the other skid as required. You can also.
[0014]
Incidentally, the movable skid 6, except that it can be displaced downward relative to the fixed skid 7 can also be increased displacement, and further, can be reciprocated in its extending direction.
[0015]
For example, when the billet B transported on the charging table is carried into the heating furnace by the apparatus configured as described above, in other words, when the billet B is taken into the work receiving surface of the fixed skid 7, it is movable. The skid 6 and the like are operated as follows. When the billet B transported onto the charging table 1 is a square cross-section billet, the billet B is moved in the width direction in the state along the entire length of one side guide 1a under the action of each roller 2. Simultaneously with the positioning, the stopper 5 also positions in the length direction. The positioning state consuming billet B, and movable skid 6, solid with lowering displaced relative constant skid 7, the heating furnace, not shown, is retreating by one pitch equivalent Wa over click receiving surface, where, The movable skid 6 is moved up to a position higher than the upper surface level of the charging table 1 and the fixed skid 7.
As a result, the billet B that has been positioned and supported on the respective rollers 2 of the charging table 1 is raised to the upper side by being replaced by the planar work receiving surface 11 of the movable skid 6.
[0016]
Thereafter, the movable skid 6 is advanced displaced by one pitch equivalent of workpiece receiving face, thereby, the planar workpiece receiving surface 11 supporting the billet B, a solid 1st planar workpiece receiving surface of the fixed skid 7 11 Kitaichi has above, further, the movable skid 6, it is lowered from the upper surface level of the fixed skid 7, by this, the billet B on the planar work receiving surface 11 of the movable skid 6, the fixed skid 7 The delivery to the flat work receiving surface 11 is completed, and the delivery of the billet B into the heating furnace is completed.
[0017]
Delete [0018]
Delete [0019]
Delete [0020]
Delete [0021]
Delete [0022]
Delete [0023]
2, the implementation form of the invention, are formed in the respective upper surface side of the movable and stationary skids is a side view showing a workpiece receiving face one pitch equivalent.
Here, each of the planar workpiece receiving surface 11 and the curved workpiece receiving surface 12 is alternately provided at almost half pitch within the workpiece receiving surface corresponding to one pitch, and the planar workpiece receiving surface 11 is curved. An inclined receiving surface whose height gradually decreases toward the workpiece receiving surface 11 side. Such an inclined receiving surface can sufficiently prevent the billet B from sliding down even when an angular cross-sectional billet B as shown by the phantom line in FIG. When the is placed, it is smoothly rolled so that the round cross-section billed B has an inclination angle β in a range that can surely enter the curved workpiece receiving surface 11.
[0024]
That is, the inclination angle β is preferably set within a range of 3 to 20 °. The reason is that an inclination of at least 3 ° is necessary in order for the round cross-section billet to roll by inertia and enter the curved workpiece receiving surface 11 with certainty. On the other hand, the square cross-section billet is stably held on the skid (does not fall over when the skid starts or stops), and the round cross-section billet hits the side part due to excessive rolling, and may become wrinkled. This is because the inclination angle β must be 20 ° or less in order to prevent fear.
[0025]
By the way, in this figure, a flat workpiece receiving surface 11 is provided on the left side of the drawing, in other words, on the charging table 1 side, and a curved workpiece receiving surface 12 is provided on the side away from it. It is also possible to reverse the relative positions of 11 and 12.
[0026]
Further, FIG. 3 shows the loading of the square cross-section billet B when the workpiece receiving surfaces 11 and 12 are formed on the movable skid 11 and the fixed skid 12 in the same order in the same pitch. It is a side view which shows a process.
The charging table 1 here transports the billet at substantially the center position in the width direction regardless of the cross-sectional shape thereof. Therefore, the side guides 1a1b are all fixed types. can do.
Here, the method shown in FIG. 3 (a), the movable skid 6, a state of being displaced downward relative to the conveyed angular cross-section billet B at a fixed skid and loading table 1, and FIG. 3 (b) Is a state in which the movable skid 6 is displaced backward relative to the heating furnace by an amount corresponding to one pitch of the workpiece receiving surface.
Then, based on the rising displacement of the movable skid 6, as shown in FIG. 3 (c), the angular cross-section billet B of loading table on 1 supports lifting by the planar workpiece receiving surface 11 of the movable skid 6. Here, since the inclined receiving surface as the planar workpiece receiving surface 11 is inclined at the inclination angle β that can sufficiently prevent the billet B from sliding down, as described above, the inclined workpiece receiving surface 11 is on the planar workpiece receiving surface 11. The angular billet B is surely positioned and supported there.
[0027]
And further, the movable skid 6, and is advanced displaced by one pitch equivalent of workpiece receiving surface, after aligning both skid 6,7 vertically, as shown in FIG. 3 (d), the movable skid 6 It is lowered to its lower limit position, and in the middle of the displacement, the square cross-section billet B on the planar work receiving surface 11 is handed over to the flat work receiving surface 11 of the fixed skid 7, thereby The carrying-in process into the furnace is completed. Thereafter, the movable skid 6 is repeatedly operated in the same manner as described above, whereby a new square cross-section billet B is carried into the furnace, and the planar work piece of the fixed skid 7 already carried into the furnace. The billet B supported on the receiving surface 11 is simultaneously conveyed by one pitch to the next planar work receiving surface 11.
[0028]
Figure 4 is a process diagram of a case where with the same device carries a round cross-section billet furnace, wherein, in a movable skid 6 is operated similarly to the place where the aforementioned, descends as shown in FIG. 4 (a) After the displacement and the backward displacement corresponding to one pitch as shown in FIG. 4 (b), it is raised as shown in FIG. 4 (c).
The movable skid 6 This increase displacement, the round cross-section billet B that is transported in a substantially central portion position of the loading table 1, as shown by the solid line in FIG. 4 (c), in which planar workpiece receiving face 11 receive. In this case, when the billet has a square cross section, as described above, the sliding of the billet and the planar work receiving surface 11 is sufficiently prevented by sliding, but when the billet has a round cross section, The billet rolls on the planar workpiece receiving surface 11 and finally enters the curved workpiece receiving surface 12 as shown by the phantom line in FIG.
Thereafter, the movable skid 6, and advancing displacement single pitch equivalent, by causing the displaced downward as shown in FIG. 4 (d), are supported by the curved work receiving surface 12 of the movable skid 6 The round cross-section billet B is delivered to the first curved workpiece receiving surface 12 of the fixed skid 7, and the in-furnace carrying-in process is completed.
Then, the new round-section billet B is carried into the furnace and the loaded round-section billet B is carried in the furnace very smoothly and reliably by repeating the above-described operation of the movable skid 6.
[0029]
Thus, according to this apparatus, it is possible to always properly support both the angular cross-section billet and the round cross-section billet based on the advance and retreat displacement corresponding to one pitch of the movable skid 6. It is possible to sufficiently prevent the occurrence of damage to the device, and the same effect as the above-described apparatus can be realized. In addition, in this apparatus, the billet can be transported at the central portion of the charging table 1 regardless of the cross-sectional shape thereof, so that it is possible to sufficiently cope with a mixed flow of a plurality of types of billets having different cross-sectional shapes. Can do.
[0030]
Incidentally, the round cross-section billet 160mm in diameter, and if the skid was heated transported in a furnace using a conventional conveying apparatus with a horizontal plane of the workpiece receiving surface, the workpiece receiving surfaces 11 and 12 as shown in FIG. 2 of each of the case where the heat conveyed with the inventive device having a was measured collapse deformation of the skid, it became as shown in FIG.
As can be seen from the graph of FIG. 5, the conventional device caused many large collapses in the range of 8 to 20 mm in the skid, whereas the inventive device produced a slight collapse of 4 mm or less in a small number of skids. Stopped to occur.
[0031]
【The invention's effect】
As is apparent from the above description, according to the present invention, one apparatus is shared by a plurality of types of steel materials having different cross-sectional shapes, and is transported reliably and smoothly without causing damage such as deformation. Therefore, the equipment cost, fuel consumption, etc. can be greatly reduced.
Moreover, according to the method of this invention, the steel material conveyed on the charging table can be smoothly and reliably carried into the furnace using the inventive device regardless of the cross-sectional shape thereof.
[Brief description of the drawings]
FIG. 1 is a plan view of an essential part showing an embodiment of an apparatus of the present invention .
2 is a side view of a work receiving surface showing the implementation form of the present invention.
FIG. 3 is a view showing a process of carrying a billet in a cross section into a furnace.
FIG. 4 is a view showing a process of carrying a round cross-section billet into a furnace.
FIG. 5 is a graph showing the amount of crush deformation of a round cross-section billet.
FIG. 6 is a perspective view of relevant parts illustrating a conventional device.
FIG. 7 is a perspective view illustrating types of workpiece receiving surfaces of a conventional apparatus.
[Explanation of symbols]
1 Charging table
1a, 1b side guide 2 rollers 3 drive motor 4 cylinder 5 stopper 6 movable skip de
7 fixed skids
11 Planar workpiece receiving surface
12 Curved workpiece receiving surface B Billet p Pitch β Inclination angle

Claims (2)

A steel furnace having a plurality of workpiece receiving surfaces at equal pitches in the steel material conveyance direction, and each of a fixed skid and a movable skid extending in parallel with each other at intervals in a direction perpendicular to the steel material conveyance direction An internal transfer device,
Each of the fixed skid and the movable skid is provided with a flat work receiving surface and a curved work receiving surface at intervals of a half pitch, and the flat work receiving surface is directed toward the curved work receiving surface. A steel material in-furnace transfer device formed as an inclined receiving surface whose height gradually decreases. When the steel material conveyed to a predetermined position on the charging table by the apparatus according to claim 1 is delivered to a fixed skid provided in the furnace and extending in a direction perpendicular to the charging table,
The steel material is received on an inclined receiving surface of a movable skid that moves up and down relative to the charging table and advances and retreats in the furnace direction, the square cross-section steel material is on the inclined receiving surface, and the round cross-section steel material is on the inclined receiving surface. With the movable skid supported by the adjacent curved workpiece receiving surface, the movable skid is moved by one pitch in the advance direction, and then the steel on the movable skid is moved to the inclined receiving surface of the fixed skid or the curved workpiece. A method for carrying in steel into a furnace, wherein the steel material is delivered to one of the receiving surfaces.

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