JPH1015610A - Method and device for delivering steel bar onto cooling bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the occurrence of the bend part in a steel bar by dropping the center part in the longitudinal direction earlier than both end part sides of the steel bar received with a opening/closing trough. SOLUTION: When a driving lever 20a is fit on a line shaft 7a with a key (k) next to a trough operating lever 6a composed by fitting on the shaft through a bearing Br and an interval adjusting mechanism 21a consisting of a screw block 22a provided on the driving lever 20a, interval adjusting bolt 23a which is screwed in the female screw of this block and on which a locknut 24 is screwed and a stopper block 25a which is provided in the vicinity of the tip of the trough operating lever 6a and to which the tip of the interval adjusting bolt 23a is abutted is provided, the trough operating lever 6a is operated with a time difference by adjusting the screwing amount of the interval adjusting bolt 23a. So the opening/closing trough in the center part in the longitudinal direction can be opened earlier than the opening/closing troughs in both end parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-rolled hot-rolled steel bar conveyed on a conveying line, and a cooling-bed rake device on the cooling floor so that the received steel bar has a temperature within a predetermined range. The present invention relates to a method of delivering steel bars to a cooling floor to be delivered to a fixed position and an improvement of a steel bar delivery device, and particularly to a method of delivering a steel bar to a cooling floor and a steel bar delivery device capable of reliably preventing occurrence of bending of a steel bar. Belongs to the technical field.

[0002]

2. Description of the Related Art In a steel bar rolling facility, a high-temperature steel bar hot-rolled by a rolling mill is received from a transport line, and the received steel bar is transferred to a cooling floor to be cooled. As such a steel bar transfer device, for example, two types of a lifter type and a trough type are known. By the way, when the rolling speed is high, for example, 15 m / s or more, a trough-type steel bar transfer device is used. Hereinafter, the configuration of such a trough type steel bar transfer device will be described with reference to FIG. 4 illustrating a cross-sectional configuration of the four-line system as an example and FIG. Then, the steel bar transfer device 1 receives the steel bar b sent from a transport line (not shown) and places the gutter-shaped opening / closing troughs 2a, 2b, 2c, 2d having an inner size corresponding to the maximum diameter of the received steel bar b on one end side. The swing arms 3a, 3b, 3c, 3d provided in the above are swingably supported by swing support shafts 4a, 4b, 4c, 4d having a vertical positional relationship.

In addition, opening and closing cylinders 8a, 8b, 8c, 8
The expansion and contraction of the rod d is performed by shaft rotation levers 9a, 9b,
Line shafts 7a, 7b, 7c, 7d rotated by being transmitted through the shafts 9c, 9d are disposed in parallel with the swing support shafts 4a, 4b, 4c, 4d and in the vertical direction. Actuating levers 6a, 6b, 6
c and 6d are externally fitted. These trough operating levers 6
The other ends of the connecting rods 5a, 5b, 5c, 5d each having one end connected to the tip of a, 6b, 6c, 6d are connected to the swing arms 3a, 3b, 3c, 3d. And
Each of these opening and closing troughs 2a, 2b, 2c, 2d is divided into a plurality in the longitudinal direction, and the swing arms 3a, 3
Each of b, 3c, and 3d is arranged at predetermined intervals in the longitudinal direction of the opening and closing trough.

The opening and closing troughs 2a, 2b, 2
c, 2d and line shafts 7a, 7b, 7c, 7d
The length of each of the opening and closing cylinders 8a, 8b, 8c and 8d is 4 to 6 m in the longitudinal direction of the opening and closing trough. They are arranged individually.

The swing arms 3a, 3b, 3
When c and 3d are horizontal, the opening and closing troughs 2a and 2
Each of the upper openings of b, 2c, 2d is closed by stopper members 10a, 10b, 10c, 10d,
In this state, the hot-rolled steel bar b transferred from a transport line (not shown) is received. Next, the swing arm 3
a, 3b, 3c, 3d are swung to open and close the troughs 2a, 2
b, 2c, 2d are stopper members 10a, 10b, 10
c, 10d, the steel bar b becomes chute 11a,
11b, 11c, 11d and fall down, and are guided by the steel bar drop guides 12, 13 provided below these chutes 11a, 11b, 11c, 11d, and cooled by the cooling floor 14.
Of the V-shaped receiving grooves 14a and 14b.

The opening and closing troughs 2a, 2b, 2c,
2d, and these opening and closing troughs 2a,
The total length of the hot-rolled steel bar b delivered from 2b, 2c, 2d to the cooling floor 14 is 60 to 100 m, and the diameter is 10 to 10 m.
Since it is 22 mm, it is extremely easy to bend and deform.
Therefore, as shown in FIG. 6A, the steel bar b is bent in a complicated manner in the longitudinal direction and falls into the receiving groove of the cooling floor 14, and
In a state where the steel bar falls into the receiving groove, as shown in FIG. 6 (b), the steel bar is cooled in a state where a bent portion is generated at some places in the longitudinal direction, which adversely affects the quality of the steel bar product.

[0007] Looking at the state from the moment when the steel bar b touches the receiving groove of the cooling floor 14 to the time when it is stabilized on the cooling floor 14, first, as shown in FIG.
Are in contact with the cooling floor 14 at two points in the longitudinal direction. In this case, as shown in FIG. 7B, since the length of the contact point is short and the frictional force P is small, the steel bar b generated by the gravity W
The ground contact point moves outward by, for example, 1 by losing the acting force F trying to straighten in the longitudinal direction. Then, FIG. 7 (c)
As shown in FIG. 7, since the contact length L is increased and the frictional force is increased, the contact point does not move outward, and as shown in FIG. This is because they are wrinkled and cooled.

That is, it is known that if the longitudinal center portion of the steel bar b is grounded to the receiving groove of the cooling floor before both end portions, a problem such as occurrence of a bent portion can be prevented. ing. Therefore, in order to open the opening / closing trough in the central portion in the longitudinal direction earlier than the opening / closing troughs in both end portions of the plurality of opening / closing troughs, and to drop the central portion in the longitudinal direction of the steel bar b earlier than both end portions, The opening / closing cylinder for operating the opening / closing trough is operated earlier than the opening / closing cylinder for operating the opening / closing trough at both ends.

[0009]

According to the above-mentioned method, it is possible to drop the central portion in the longitudinal direction of the steel bar earlier than the both end portions. However, since the line shaft is connected by a coupling for synchronous rotation, even if the opening / closing cylinder at the center is operated earlier than the opening / closing cylinders at both ends, the bending of the line shaft and the coupling It only opens earlier than the backlash. More specifically, the opening and closing troughs in the central portion in the longitudinal direction are opened only about 2 to 3 mm at most earlier than the opening and closing troughs located at both ends, and are not much different from opening at almost the same time. There was a problem to be solved that could not be prevented.

Accordingly, it is an object of the present invention to provide a method of delivering a steel bar to a cooling floor and an apparatus for delivering the steel bar to the cooling floor, which can reliably prevent the bending of the steel bar.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the method for transferring steel bars to a cooling floor according to the first aspect of the present invention is to provide a method of transferring steel bars to a cooling floor. The hot rolled steel bar at the receiving position where it is in contact with the stopper member is received by a plurality of gutter-shaped opening / closing troughs that are continuously arranged straight, and a line that is arranged in parallel with the opening / closing trough. By operating a plurality of trough operating levers supported by the shaft with a plurality of synchronously operated opening / closing cylinders via a line shaft, the opening / closing trough is separated from the stopper member and the steel bar is dropped onto the cooling floor. In the method for transferring steel bars according to the above, after the opening / closing trough located at the central portion in the longitudinal direction is separated from the stopper member by a predetermined distance, the opening / closing trough located at both ends Actuate the trough actuating lever to open and close, characterized in that to separate the closing trough located both end portions of the stopper member.

Further, in order to solve the above-mentioned problem, the means adopted by the apparatus for transferring steel bars to the cooling floor according to claim 2 of the present invention is characterized in that a hot-rolling device is provided at a receiving position where the upper opening is in contact with the stopper member. Along with receiving the rolled steel bar, a plurality of trough-shaped opening and closing troughs that drop the received steel bar to a predetermined position on the cooling floor via a chute when separated from the stopper member, and are disposed in parallel with the opening and closing trough. A plurality of trough operating levers supported by the line shaft are operated via the line shaft to open and close the opening and closing troughs. In addition to making the trough operating levers swingable, drive levers are arranged side by side at positions adjacent to these trough operating levers,
At one end of the trough operating lever and the drive lever, an interval adjusting mechanism for transmitting the operation of the drive lever that is swung by the rotation of the line shaft to the trough operating lever with a time difference is provided. It is characterized by the following.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A trough-type bar and bar delivery system according to an embodiment for realizing a bar and bar delivery method according to the present invention will be described below with reference to FIG. FIG. 2 (a) showing an enlarged view of a portion A in FIG.
Referring to FIG. 2 (b) as viewed in the direction of the arrow B in FIG. 3 (a) and FIGS. Those having functions will be described with the same reference numerals.

As shown in FIG. 1, the steel bar transfer device 1 receives a steel bar b sent from a transport line (not shown), and has a gutter-shaped opening / closing trough 2a having an inner size corresponding to the maximum diameter of the received steel bar b. , 2b, 2c, 2d on one end side, are swingably supported by swing support shafts 4a, 4b, 4c, 4d having a vertical positional relationship. The rods of the open / close cylinders 8a, 8b, 8c, 8d are arranged in parallel with and above and below the swing support shafts 4a, 4b, 4c, 4d, and the expansion and contraction of the rods of the open / close cylinders 8a, 8b, 8c, 8d are performed via shaft rotation levers 9a, 9b, 9c, 9d. Line shaft 7 rotated by transmission
a, 7b, 7c, 7d are provided with trough operating levers 6a, 6b,
6c and 6d are externally fitted, and these trough operating levers 6a and 6d
The other ends of the connecting rods 5a, 5b, 5c, 5d having one ends connected to the tips of 6b, 6c, 6d are swing arms 3a,
3b, 3c, 3d. Each of these opening / closing troughs 2a, 2b, 2c, 2d is divided into a plurality in the longitudinal direction, and swing arms 3a, 3b, 3c, 3d
Are disposed at predetermined intervals in the longitudinal direction of the opening / closing trough.

The swing arms 3a, 3b, 3
When c and 3d are horizontal, the opening and closing troughs 2a and 2
Each of the upper openings of b, 2c, 2d is closed by stopper members 10a, 10b, 10c, 10d,
In this state, the hot-rolled steel bar b transferred from a transport line (not shown) is received. Next, the swing arm 3
a, 3b, 3c, 3d are swung to open and close the troughs 2a, 2
b, 2c, 2d are stopper members 10a, 10b, 10
c, 10d, the steel bar b becomes chute 11a,
11b, 11c, 11d and fall down, and are guided by the steel bar drop guides 12, 13 provided below these chutes 11a, 11b, 11c, 11d, and cooled by the cooling floor 14.
Of the V-shaped receiving grooves 14a and 14b.

As is well understood from the above description, the above configuration is exactly the same as that of the conventional apparatus for transferring steel bars to the cooling floor. In the present embodiment, the bar and bar delivery device having such a configuration is provided with the structure shown in FIGS. 2 (a) and 2 (b).
And drive levers as shown in FIG. As can be clearly understood from FIG. 1, all the trough operating lever mechanisms have the same shape and the same configuration.
The third trough operating lever mechanism (A section enlarged view) will be described.

That is, the trough operating lever mechanism is shown in FIG.
As shown in FIG. 2A and FIG.
A drive lever 20a is externally fitted via a key k at a position adjacent to a trough operating lever 6a that is swingably externally fitted on the a through a bearing Br. An interval adjusting mechanism 21a, which will be described later, is provided on the tip side of the trough operating lever 6a and the driving lever 20a. The gap adjusting mechanism 21a includes a screw block 22a provided at the tip of the drive lever 20a, a gap adjusting bolt 23a screwed into a female screw of the screw block 22a, and a lock nut 24a screwed therein, and a trough operating lever 6a. A stopper block 25a is provided near the distal end, and the distal end of the gap adjusting bolt 23a contacts the stopper block 25a.

That is, the angle between the trough operating lever 6a and the drive lever 20a about the radial center of the line shaft 7a and the angle between the trough operating lever 6a and the drive lever 20a are determined by the screwing amount of the spacing adjusting bolt 23a. The angle formed is configured to be freely adjustable. The screw block of the gap adjusting mechanism 21a may be provided on the trough operating lever side, and the stopper block may be provided on the drive lever side. Note that reference numerals 20b, 21b, 20c,
Reference numerals 21c, 20d, and 21d denote second, third, and fourth drive levers and an interval adjusting mechanism having the same configuration as the first drive lever 20a and the interval adjusting mechanism 21a from the top.

The mode of operation of the steel bar transfer device 1 having the above-described configuration will be described below. First, the opening and closing troughs 2a, 2b, 2c,
Opening and closing troughs 2a, 2b, 2 in the central portion in the longitudinal direction of 2d
The gap adjusting bolts of the gap adjusting mechanisms 21a, 21b, 21c, 21d of the trough operating lever mechanism for operating c, 2d are screwed in, and the ends thereof are brought into contact with the stopper blocks. On the other hand, the gap adjusting mechanism 21a of the trough operating lever mechanism for operating the opening and closing troughs 2a, 2b, 2c, 2d at both ends in the longitudinal direction of the opening and closing troughs 2a, 2b, 2c, 2d.
The interval adjusting bolts 21b, 21c, 21d are unscrewed, and a predetermined interval is left between the tip and the stopper block.

Next, the open / close cylinders 8a, 8b, 8c,
When the rod of 8d is reduced, the shaft rotation lever 9
a, 9b, 9c, 9d through the line shafts 7a, 7
b, 7c, 7d rotate to drive levers 20a, 20b,
20c and 20d swing, but first, the trough operating levers 6a, 6b, 6c and 6d for operating the opening and closing troughs 2a, 2b, 2c and 2d in the central portion are operated, and the opening and closing troughs 2a, 2b and 2c in the central portion. , 2d are separated from the stopper member by a predetermined distance, the trough operation levers 6a, 6b, 6c, 6d at both ends are operated, and the opening and closing troughs 2a, 2b, 2c, 2d at both ends are separated from the stopper member. The central part of the steel bar b falls before the both ends. The opening / closing cylinders 8a, 8b, 8c, 8d
Are operated individually.

By the way, since a predetermined distance is set between the tip of the distance adjusting bolt and the stopper block,
With this configuration, the opening and closing troughs 2 at both ends do not come into contact with the stopper member 10 in the receiving state of the steel bar.
Therefore, the trough operating lever 6 for operating the opening and closing troughs 2 at both ends is connected to the swing support shaft 4 of the swing arm 3 as shown in FIG. The opening / closing trough 2 is also configured to be brought into contact with the stopper member 10 by urging the trough operating lever 6 side with a spring s, or FIG. As described above, the trough operating lever 6 is more movable than the swing support shaft 4 of the swing arm 3.
The balance weight Wt is disposed on the side, and the weight of the balance weight Wt causes the opening and closing troughs 2 at both ends to abut against the stopper member 10.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of an example in which a bar is transferred to a receiving groove of a cooling floor by using a bar transferring device according to the present invention. First, a trough operating lever for operating opening and closing troughs 2a, 2b, 2c and 2d in a central portion. Mechanism interval adjusting mechanisms 21a, 21b,
Screw the gap adjusting bolts 21c and 21d into contact with the stopper block. Next, in the direction from the central portion toward both ends, the distance adjusting mechanisms 21a, 21b, 21c of the trough operating lever mechanism for operating the opening / closing troughs 2a, 2b, 2c, 2d toward both ends.
By gradually unscrewing the gap adjusting bolt of 21d, the gap between the tip of the gap adjusting bolt and the stopper block becomes gradually larger toward both ends (in this example, the gap between the tip of the gap adjusting bolt at both ends and the tip of the gap adjusting bolt is gradually increased). The maximum distance from the stopper block was set to 30 mm.) After setting the distance between the tip of the distance adjusting bolt and the stopper block in this manner, the total length is 60 to 100.
m, a steel bar having a diameter of 10 to 22 mm is dropped into a receiving groove of the cooling floor.

As a result, the opening and closing trough at the central portion is separated from the stopper member 30 mm earlier than the opening and closing trough at both end portions, and the central portion in the longitudinal direction of the steel bar is inserted into the receiving groove of the cooling floor before both end portions. Ground. Therefore, unlike the conventional steel bar delivery device, the entire steel bar does not substantially simultaneously touch the ground, so that a bent portion does not occur in the longitudinal direction of the steel bar, and a steel bar product without bending deformation can be obtained. it can.

In the above description, the steel bar transfer line has a four-line system, but the technical concept of the present invention can be applied to an eight-line system. Therefore, the scope of the technical idea of the present invention is not limited by the above embodiments.

[0025]

As described above, according to the method for transferring steel bars to the cooling floor according to the first aspect of the present invention or the apparatus for transferring steel bars to the cooling floor according to the second aspect of the present invention, the opening / closing trough at the center portion has both ends. It is ensured to operate earlier than the opening / closing trough of the part, so that the longitudinal central portion of the steel bar received by the opening / closing trough can be dropped earlier than both end portions. Therefore,
Since the longitudinal center portion of the steel bar can be grounded to the cooling floor before both end portions, the steel bar is grounded at a plurality of points as in the prior art, so that bending deformation does not occur between the ground points, and the steel bar product This has an extremely excellent effect that it can greatly contribute to the improvement of product quality.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of a steel bar delivery device according to an embodiment of the present invention.

2 (a) is an enlarged view of a portion A in FIG. 1, and FIG. 2 (b) is a view taken in the direction of arrow B in FIG. 2 (a).

FIG. 3 relates to the embodiment of the present invention, and FIG.
(B) is an explanatory view of a state where the opening and closing trough abuts on the stopper member.

FIG. 4 is an explanatory view of a cross-sectional configuration of a trough-type steel bar transfer device according to a conventional example.

FIG. 5 is a view as viewed in the direction of arrow C in FIG. 5;

FIGS. 6 (a) and 6 (b) are explanatory views of a bent state of a steel bar.

FIGS. 7 (a), (b), (c) and (d) are explanatory diagrams of the state from the moment when the steel bar contacts the cooling floor until it is stabilized on the cooling floor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel bar delivery apparatus, 2, 2a-2d ... Opening / closing trough, 3
a to 3d: swing arm, 4a to 4d: swing support shaft, 5a to 5d: connecting rod, 6, 6a to 6d: trough operating lever, 7a to 7d: line shaft, 8a to 8d: opening / closing cylinder, 9a to 9d: shaft rotation lever, 1
0, 10a to 10d ... stopper member, 11a to 11d ...
Chute, 12: Steel bar drop guide, 13: Steel bar drop guide, 14: Cooling floor, 14a, 14b: Receiving groove, 20a-2
0d: drive lever, 21a to 21d: interval adjustment mechanism, 2
2a: Screw block, 23a: Spacing adjusting bolt, 24a
... Lock Knuck, 25a Stopper Block, Br Bearing, b Steel Bar, k Key.

Claims (2)

[Claims] 1. A hot-rolled steel bar at a receiving position where an upper opening abuts on a stopper member is received by a plurality of trough-shaped open / close troughs which are continuously arranged in a straight shape, and the open / close trough is provided. By operating a plurality of trough operation levers supported by a line shaft arranged in parallel with a plurality of synchronously operated opening / closing cylinders via the line shaft, the opening / closing trough is separated from the stopper member and the steel bar is removed. In the method of transferring steel bars to the cooling floor dropped on the cooling floor, a trough operating lever for opening and closing the opening and closing troughs located at both ends after the opening and closing trough located at the central portion in the longitudinal direction is separated from the stopper member by a predetermined distance. Actuating the opening and closing troughs located at both ends from the stopper member to transfer the steel bars to the cooling floor. Law. 2. A hot-rolled steel bar is received at a receiving position where the upper opening is in contact with the stopper member, and the steel bar received when separated from the stopper member is moved to a predetermined position on the cooling floor via a chute. A plurality of trough-shaped opening / closing troughs to be dropped are provided, and a plurality of trough operating levers supported by a line shaft arranged in parallel with the opening / closing trough are operated via the line shaft to synchronize these opening / closing troughs. In a device for transferring steel bars to a cooling floor provided with a plurality of open / close cylinders that are operated, the plurality of trough operating levers are swingable, and drive levers are juxtaposed at positions adjacent to the respective trough operating levers. A drive lever pivoted by the rotation of the line shaft is provided at one end of the trough operation lever and the drive lever. An apparatus for transferring steel bars to a cooling floor, comprising an interval adjusting mechanism for transmitting the movement to the trough operating lever with a time difference.