JP2602036Y2 - Pinch roll for multiple rows of billets - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift roll in a pinch roll for applying a pinch force to a plurality of rows of billets, and more particularly to a feed pinch roll for a multi-strand rolling mill. .

[0002]

2. Description of the Related Art Conventionally, a multi-strand rolling mill has been known, in which a plurality of rows of billets conveyed from a heating furnace are thrusted by a plurality of pinch rolls arranged in parallel. And rolls are fed into one rolling mill, and in such a rolling mill, a plurality of rows of billets are usually fed with a time lag (for example, Japanese Patent Publication No. 63-6281). Reference). On the other hand, in a billet rolling mill, the feeding speed of the billet by the pinch roll is usually set to a high speed at the time of conveyance in order to improve productivity, and after the biting into the rolling mill, at a speed equal to the rolling speed. The speed is lower than the speed. A function that makes the feed speed different,
When applied to the multi-strand rolling mill, there are the following problems.

FIG. 5 is a conceptual view of a conventional multi-strand rolling mill for billets, FIG. 6 is a front view of the pinch roll 1 of FIG.
FIG. 7 is a view taken in the direction of arrows c in FIG. 6, and shows an apparatus for rolling two rows of billet billets 2a and 2b. In FIG. 5, the billet 2 is carried out of the heating furnace 3 with a time difference.
First, the first row of billets 2a is fed into a No. 1 rough rolling roll 4 and a No. 2 rough rolling roll 5 by a pinch roll 1 first. , 5
Then, the second row of billets 2b is transported at a high speed by the pinch roll 1.

Here, the pinch roll 1 has a lower roll 7 common to each billet as shown in FIGS.
The lower roll 7 is rotated by a motor 9 through a speed reducer 10 at a fixed position. The upper roll 8a is divided into two parts, 8a and 8b. On the other hand, the two upper rolls 8a and 8b are supported by one ends of swing arms 11a and 11b, respectively, and the other ends of these swing arms 11a and 11b are upper rolls.
Connected to the pressure reduction cylinder 12. The upper roll pressure lowering cylinder 12 is mounted on a pinch roll frame 13 and stands upright. Therefore, two rows of billets 2a, 2b
Is a lower roll 7 common to the divided upper rolls 8a and 8b.
The steel slabs 2a and 2b are conveyed while being separately lowered because the upper roll lowering cylinder 12 operates separately.

[0005] In the pinch roll 1, the preceding steel slab 2 a that has already been bitten by the rolling rolls 4 and 5.
Is progressing at the rolling speed, and the lower roll 7 is rotated in synchronization with the rolling speed, but the preceding steel slab 2a is bitten by the rolling rolls 4,5. In order to feed the succeeding billet 2b to the rolling mill while the
1 is rotated at an increased speed.

As a result, the lower roll 7 supporting the preceding slab 2a rotates faster than the rolling speed, and
Although a is in a non-pressed state, since it is conveyed while slipping with respect to the lower roll 7, there is a problem that the steel piece 2a is scratched.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve such a problem, and the gist of the present invention is to provide a plurality of rows of steel slabs (2a, 2b) by applying a pinch force to the steel slabs. In the pinch roll (1), the lower roll (7) of the pinch roll (1) is always rotatable in order to apply a pinch force, and the common roll of each steel slab (2a, 2b) is provided. And the upper rolls (8a, 8b) are
a, 2b) and a split roll capable of moving up and down, and a lower roll near the pinch roll (1).
(7) lift roll (2) that lifts the billet during rolling.
0a, 20b) are provided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. The same portions are denoted by the same reference numerals, and description thereof is omitted.

This embodiment is suitable for rolling a billet 2 into a wire or a rod, and therefore, a grooved caliber is formed on a rolling roll. Moreover, the steel slabs 2 are arranged in two rows, a first row and a second row.

First, the upper roll 8 in the pinch roll 1
a and 8b will be briefly described. Arm support shaft 15
a and 15b are a pair of bearings 16a, 17a, 16b, 1
7b so as to be rotatable.
One ends of the swing arms 14a and 14b are fixed and supported, and the upper rolls 8a and 8b are rotatably supported at the other ends of the swing arms 14a and 14b. Bearing portions 16a, 17a, 1 of the arm support shafts 15a, 15b
A square shaft portion 15 'is provided between 6b and 17b.
Split bosses 18a and 18b are connected to the square shaft portion 15 '. The split bosses 18a and 18b have operating levers.
19a and 19b are protrudingly provided.
a, 19b are connected to the upper roll pressure lowering cylinders 12a, 12b. Therefore, the upper roll lowering cylinder 12
If a and 12b operate, the operating levers 19a and 19b →
Split bosses 18a, 18b → arm support shafts 15a, 15b
→ Via the swing arms 14a, 14b, the upper roll 8a,
Reference numeral 8b depresses or retreats toward the lower roll 7.

The above configuration is the same as the conventional one, but in this embodiment, the following lift rolls 20a and 20b are provided. That is, the lift rolls 20a and 20b are rotatably supported by swing arms 21a and 21b for fork-shaped lift rolls, and the lift rolls of the swing arms 21a and 21b for lift rolls. Arm support shaft 22a for
22b is a pair of bearing portions 23a and 24 for lift rolls.
a, 23b, and 24b rotatably supported.

The lift roll arm support shaft 22a,
22b Lift Roll Bearings 23a, 24a, 23
b and 24b, a square shaft portion 22 'is provided, and the square shaft portion 22' is provided with a split boss 2 for a lift roll.
5a and 25b are connected. Working levers 26a, 26b are protruded from the lift roll split bosses 25a, 25b, and the working levers 26a, 26b are connected to lift roll cylinders 27a, 27b.
Therefore, if the lift roll cylinders 27a, 27b are extended, the operating levers 26a, 26b → lift roll split bosses 25a, 25b → lift roll arm support shafts 22a, 22b → lift roll. Swing arm 21
a and 21b, the lift rolls 20a and 20b
The billets 2a and 2b are swung upward until the lower sides thereof are separated from the lower roll 7 of the pinch roll 1. And
If a and b are the subscripts of the first and second rows, the operation of the lift rolls 20a and 20b is controlled in relation to the pinch roll 1 as shown in FIG. In the figure, d is a time lag, and the lift rolls 20a, 20b are set before the traveling speed of the billets 2a, 2b becomes high or before the lower roll 7 becomes high.
20b is lifted.

[0013]

According to the present invention, the lower roll is used as a common roll and the upper roll is used as a split roll to apply pinch force to a plurality of rows of steel pieces separately. Not only is the power required for the pinch force reduced, but when the succeeding billet is fed into the rolling mill, the rear part of the preceding billet during rolling is lifted from the lower roll, so that the billet is rubbed. No scratches.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line A-A in FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an operation control chart.

FIG. 5 is a conceptual diagram of a conventional multi-strand rolling mill.

FIG. 6 is a front view of the pinch roll of FIG. 5;

FIG. 7 is a view taken in the direction of arrows C in FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pinch roll, 2a, 2b ... Steel piece, 3 ... Heating furnace, 7
... lower roll, 8a, 8b ... upper roll, 20 ... lift roll
Le

Continuing on the front page (72) Inventor Masaki Kani 5-2 Sokai-cho, Niihama-shi, Ehime Prefecture Sumitomo Heavy Industries Niihama Works (56) References JP-B 63-6281 (JP, B2) (58) Survey Field (Int.Cl. ⁶ , DB name) B21B 39/10 B21B 39/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A steel slab of a plurality of rows (2a, 2b) is conveyed by applying pinch force on Pinchiro - in Le (1), the pin <br/> Chiro - under the LE (1) B - Le (7 ) Is always rotatable in order to apply a pinch force, and is constituted by a common roll of each steel slab (2a, 2b), and the upper roll (8a, 8b) is formed by a common roll of each steel slab (2a, 2b). And a lift roll that lifts the steel slab being rolled from the lower roll (7) near the pinch roll (1) in the vicinity of the pinch roll (1). 20a, 20b). A plurality of rows of pinch rolls for billets, characterized by comprising: