JP3089210B2 - Hot rolled steel runout table - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a runout table made of a hot-rolled steel sheet, and more particularly to an improvement technique which does not require a gap between a transport roller of a runout table and an apron.

[0002]

2. Description of the Related Art In a runout table of a hot rolling (hot strip mill), when a thin plate is passed at a high speed, the purpose is to prevent the tip of the material from sticking between a transport roller and an apron, and to reduce the heat of the roller. In order to avoid contact between the roller and the apron due to expansion, the gap between the roller and the apron needs to be adjusted within a certain range, and the gap has been regularly adjusted. FIG. 3 explains this. The run-out table for transporting the hot-rolled steel sheet 8 is composed of a number of transport rollers 1 and an apron 6 interposed therebetween. The apron 6 receives the leading end of the hot-rolled steel sheet between the transport rollers so that the hot-rolled steel sheet can be transported smoothly. In such a run-out table, the hot-rolled steel sheet 8 traveling on the pass line 5 on the upper surface of the transport roller 1
There is a possibility that the leading end may enter the gap 7 between the transport roller 1 and the apron 6, and if it does, a trouble will occur. Therefore, it is necessary to always maintain the gap 7 at a minimum appropriate value.

[0003]

That is, the gap between the transport roller and the apron is constantly changed due to wear of the transport roller, loosening and displacement of the apron mounting portion, and the gap is constantly measured and adjusted at a certain cycle. There is a need. Also,
During operation, since the roller is in contact with the hot-rolled steel sheet, thermal expansion and contraction are repeated, and the gap is not constant.

Japanese Patent Application Laid-Open No. 4-162909 discloses that a conveying roller has a stepped shape having a concave groove having a small diameter at an axially central portion of a body portion, and a front end portion on an entrance side of an apron has a stepped shape. It discloses a transport roller structure in which a convex portion of an apron is fitted with a gap in a concave groove of a roller. In addition, technology to constantly monitor the flaws and the like of the hot-rolled steel sheet and maintain the rolls has been developed.
Devices that inspect the back side online have come to be used. In this case, the pitch of the transport rollers at that part is wider than the normal part in order to secure the field of view of the observation camera and sensor for monitoring the back side of the hot-rolled steel sheet. The target opening / closing gate is closed. As such a gate structure, as shown in FIG.
In general, a system using a gate 15 which turns and opens and closes around a fulcrum 7 is used. Due to the positional relationship between the fulcrum (slewing shaft 17) and the gate 15, the swivel gate 15 cannot be provided with a transport roller within the gate swivel radius (in the trajectory 19) in order to avoid contact with the gate 15. The above gap 2
1 had to be provided. In this case, there is a problem in that a trouble occurs when the leading end of the rolled material enters or is caught in the gap between the gate 15 and the transport roller 11.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique capable of eliminating the conventionally required management of a gap between a conveying roller and an apron in a hot rolling run-out table. .

[0006]

Means for Solving the Problems A first invention of the present invention is:
A hot-rolled steel sheet characterized in that the conveying roller is a stepped roller of the same shape having a plurality of small-diameter portions intermittently in the longitudinal direction of the roller, and an elongated continuous apron member continuous in the line direction is arranged at the small-diameter portion. It is a runout table. First,
Provide a difference in the roller outer diameter in the longitudinal direction of the transport roller,
A stepped roller composed of a large diameter portion 2 and a small diameter portion 3 is used. A relatively elongated continuous apron member made of a round bar, a square bar, a flat bar, a steel bar, a pipe, or the like is provided on the rollers along the line direction over a large number of rollers above the small diameter portion of the stepped roller. Install. The upper surface of the continuous apron member is lower than the upper surface of the large diameter portion 2 of the step roller. By installing these continuous apron members, the function of the conventional apron between the rollers can be easily substituted, and the hot-rolled steel sheet traveling on the transport roller is prevented from dropping between the rollers. That is, this corresponds to making the gap between the transport roller and the apron zero. This continuous apron member,
It is sufficient that they are substantially continuous in the line direction, and they do not necessarily have to be integrally continuous, even if members of an appropriate length are arranged so that the ends overlap each other in the line longitudinal direction. Good.

According to the present invention, the work of measuring and adjusting the gap between the transport roller and the apron can be eliminated. This technology has a great advantage when applied to hot rolling in which the tip of a hot-rolled steel sheet is transported tens of thousands of times a month.
Of course, the present invention can be applied to cold rolling (steel, aluminum, stainless steel, etc.), equipment having a table for transporting a thin plate at high speed, and the like.

Next, the second invention of the present invention is applied when an apron must be used as an opening / closing gate. That is, a gate that pivots downward is provided on the lower surface of the table, and the transport roller adjacent to the gate is a stepped roller having a plurality of small-diameter portions intermittently in the roller longitudinal direction,
On one side of the gate where the gate is close to the roller, an uneven notch is provided that faces the profile of the stepped roller via a narrow gap, and enters the small-diameter portion of the stepped roller when the gate is closed.
So that the end of the gate that fits within the outer diameter of the large diameter roller
2 is a run-out table of a hot-rolled steel sheet, wherein That is, a roller which is opposite to the turning axis when viewed from the gate body of the transport roller adjacent to the turning gate is a stepped roller provided with a plurality of small diameter portions intermittently in the roller longitudinal direction. The end (one side) of the gate farthest from the turning axis of the turning gate is formed in an uneven shape so as to mesh with the profile of the stepped roller. When the gate is closed, the gate end of this uneven shape that has entered the small-diameter portion of the stepped roller is positioned so as to be within the outer diameter of the large-diameter portion of the roller. The gap can be eliminated and the end of the hot-rolled steel plate can be prevented from sticking.

[0009]

1 and 2 show an embodiment of the first invention of the present invention. FIG. 1 is a plan view of a run-out table of an embodiment, and FIG. 2 is a cross-sectional view taken along the line AA.
The steel sheet conveying roller 1 has a plurality of small diameter portions 3 in the roller longitudinal direction.
Is intermittently provided. On the small diameter portion, a round bar 4 as a continuous apron member is disposed between a plurality of rollers. The round bar 4 has an upper surface below the pass line 5 and a lower surface at a height not in contact with the stepped roller 1 to prevent the tip of the hot-rolled steel sheet from being inserted between the conveying rollers 1. Acts the same as an apron. Further, in the apron 6 of the conventional type shown in FIG. 3, the gap 7 between the transport roller and the apron, which had to be structurally generated, can be reduced to zero, thereby reducing the trouble of passing through the plate (tip sticking, hooking). In addition, it is possible to eliminate the trouble of adjusting the gap.

An example of a run-out table to which the present invention is applied is as follows. Sheet thickness: 1.2 to 25.0 mm Sheet width: 700 to 2200 mm Speed: 300 to 1200 mpm Temperature: 300 to 900 ° C. Between tables on the run-out table on the exit side of the finishing mill in a hot rolling mill (hot strip mill) Thrusting and smashing troubles have been 1-2 times / year in the past, but have been eliminated. In addition, the measurement of the gap between the roller and the apron and the adjustment work were conventionally required at least once / month × 2 persons × 4 hours, but are not required entirely.

Next, an embodiment of the second invention is shown in FIGS. 4 is a plan view, and FIG. 5 is a sectional view taken along line BB of FIG.
It is an arrow view. A camera not shown observes the back surface of the material. At this time, the opening / closing gate 15 located between the transport rollers 11, 11 is moved out of the field of view of the camera. This movement is performed by a structure that can be turned by a gate turning shaft 17 and a cylinder 18 disposed below the line. Here, the right side of the paper of FIG. 4 is defined as the line upstream side. The conveying roller on the upstream side of the line adjacent to the gate 15 is a stepped roller 12 composed of a large diameter portion 13 and a small diameter portion 14, and the upstream end of the gate 15 is formed along the stepped roller 12 so that the conveying roller 12 Gate 1
The gap in the line direction between the five can be made zero.
The gate 15 is driven by a low inertia hydraulic cylinder 18.
Thus, the gate 15 can be opened and closed at high speed.

When inspecting the back surface of the material by the flaw detection device, the gate 15 is opened. In the embodiment, the stepped roller 12 has a large diameter 30.
0mmΦ, small diameter 200mmΦ, large diameter part 4
It was arranged in several places. The opening and closing timing of the gate 15 opens after the tip of the hot-rolled steel sheet passes through the gate so as not to impair the sheet passing property,
Close before passing through the end of hot rolled steel sheet. The opening / closing time is within 3 seconds at a setting of the cylinder speed of 200 mm / sec.

[0013]

According to the present invention, the tip of a hot-rolled steel plate runs tens of thousands of times a month on a run-out table of a hot-rolling plant, and the conventional tip may hit the gap between the conveying roller and the apron. , Meticulous gap management was necessary,
According to the present invention, there is no fear of such a trouble, and the trouble of inspection, management, adjustment, and the like can be completely eliminated.

[Brief description of the drawings]

FIG. 1 is a plan view of a run-out table according to an embodiment.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a side view of a conventional run-out table.

FIG. 4 is a plan view of another embodiment.

FIG. 5 is a view taken in the direction of arrows BB in FIG. 4;

FIG. 6 is a side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller 2 Large diameter part 3 Small diameter part 4 Round bar (continuous apron member) 5 Pass line 6 Apron 7 Gap 8 Hot rolled steel plate 11 Roller 12 Roller 13 Large diameter part 14 Small diameter part 15 Gate 16 Arm 17 Revolving axis 18 Cylinder 19 Locus

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sadanori Nakano 1-chome, Kawasaki-dori, Mizushima, Kurashiki-shi Kawasaki Steel Corporation Mizushima Works (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 39 / 00,39 / 12

Claims (2)

(57) [Claims] 1. A method according to claim 1, wherein the conveying roller is a stepped roller of the same shape having a plurality of small-diameter portions intermittently in the longitudinal direction of the roller, and an elongated continuous apron member continuous in the line direction is disposed on the small-diameter portion. Features A runout table of hot rolled steel sheets. 2. A gate turning downward is provided on the lower surface of the table, and a conveying roller adjacent to the gate is a stepped roller having a plurality of small diameter portions intermittently in a longitudinal direction of the roller. An uneven notch is provided on one side adjacent to the profile of the stepped roller via a narrow gap, and a gap which has entered the small diameter portion of the stepped roller when the gate is closed.
The roller end is positioned so that it fits within the outer diameter of the roller's large diameter section.
Runout table of the hot-rolled steel sheet, characterized in that the constant was.