JP2001121204A - Pinch roller for carrying plurality of structural steels - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pinch roller to unify the feed speed of each structural steel when a plurality of angle steels is carried at a time. SOLUTION: In the pinch roller for carrying a plurality of structural steels by holding the structural steels by a first roll and a second roll, the first roll and the second roll have uneven portions to meet the shape of the angle steels, and the apex angle of a projecting portion of the first roll having a ridge-shaped projecting portion is below 90 deg., and the apex angle of a recessed portion of the second roll having a ridge-shaped recessed portion is over 90 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roller used for simultaneously transporting a large number of steel bars, and more particularly to a pinch roller used in a multi-bar steel in-line straightening / cutting system for simultaneously correcting and cutting a large number of steel bars.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open Nos. 62-120912 and 8-168919 disclose rolling, cooling, straightening,
A cutting system is disclosed. As disclosed in these, the bar steel rolled in the rolling mill is generally several tens of meters to several hundreds of meters in length, but is suitable for the cooling floor length in order to flow to the next cooling step. And cooled by a cooling floor. After that, thermal stress distortion occurs due to uneven cooling in the cooling floor.Therefore, it is necessary to perform a process of removing distortion such as bending by a straightening machine and to cut the product length, and these may be performed offline, but cooling in the cooling floor may be performed. After that, the mainstream is a method of straightening the product downstream and cutting it into a product length. At this time, it is necessary to match the rolling capacity with the equipment capacity downstream from the cooling floor, but since the speed of straightening and cutting is slower than the rolling speed, in the process of straightening and below, multiple strips that simultaneously process multiple steel bars A method of equalizing the entire processing capacity by straightening and cutting is adopted. As described above, when a plurality of steel bars are transferred at a time, a pinch roller for transfer is installed between the straightening machine and the cutting machine or before and after the cutting machine. For the roll of the pinch roller, use upper and lower rolls with grooves according to the number and shape of the strips, guide the straightening machine to the cutting machine and hold the downstream table from the cutting machine while holding down the plurality of strips so that they do not slip. Of steel bar to the country. The multi-strip group sent out from the straightening machine is cut by the cutting machine at the same time after being sent out for a predetermined length and stopped or after being sent out for a predetermined length during traveling, and having a predetermined product length. Become.

[0003]

As described above, when a group of multiple strips is transported by a pinch roller as described above, all the strips cannot be pinched in the same state due to a slight difference in shape between the strips. Therefore, there is a problem that a difference occurs in the feed speed. This is because the bite height of the pinch roller changes depending on each bar due to the subtle difference in the cross-sectional shape of the bar, and the radius of rotation of each roll of the pinch roller is different, so the feed speed is different for each bar. If a difference occurs and a large number of steel bars are cut at the same time, the difference in feed speed appears as a variation in product length.

[0004] This will be specifically described with reference to FIG. When sandwiching the angle iron (angle) 5 with a pinch roller,
In general, a roll 1 having a mountain-shaped convex portion and a roll 2 having a V-shaped groove concave portion are combined and sandwiched. Here, assuming that the roll having the convex portion is the first roll 1 and the roll having the concave portion is the second roll 2, in the conventional roll, as shown in FIG. Roll 2
The vertical angle of the concave portion of the V-shaped groove is also set to 90 °.
However, the cross-sectional shapes of the plurality of angle irons fed simultaneously are slightly different, and the apex angle is shifted from 90 ° within the JIS tolerance range. As shown in FIG. 5, the central portion of the cross section of the angle iron 5 is referred to as a crest portion 6 and the end portion is referred to as a leg portion 7. When the apex angle 8 is larger than 90 °, as shown in FIG. When the apex angle 8 is smaller than 90 °, the peak 6 cannot contact the first roll 1 as shown in FIG. You will hit the roll. When the contact positions of the angle irons are displaced in the radial direction of the roll as described above, the angle iron contacting the first roll 1 at the forefoot portion 7 becomes the angle iron contacting the first roll 1 at the peak 6. The radius of rotation with respect to the first roll 1 is smaller than that of steel, and the feed speed is lower.
In this way, although there is a slight difference, if the feed rate varies between the strips, the transport distance of each strip will vary, resulting in a variation in the product length even when cutting at the same time. Will happen.

An object of the present invention is to solve the above-mentioned problems and to provide a pinch roller in which a plurality of angle steels are conveyed at one time, and a feed speed becomes uniform for each bar.

[0006]

The above object is achieved by the following invention. In the first invention, the first roll and the second roll
In a multi-strip steel transport pinch roller for transporting by sandwiching a steel bar between rolls, the first roll and the second roll have an uneven portion according to the shape of the angle iron, and have a mountain-shaped convex portion. A pinch roller wherein the apex angle of the convex portion of the first roll is less than 90 °.

The second invention of the present invention relates to a multi-strip steel transport pinch roller for transporting a steel strip by sandwiching the steel strip between a first roll and a second roll, wherein the first roll and the second roll are shaped like angle irons. The second roll having a concave and convex portion having a concave and convex portion having a peak angle of 9
A pinch roller characterized by being larger than 0 °.

[0008] The third invention of the present invention is the pinch roller according to the first invention of the present invention, wherein the apex angle of the concave portion of the second roll is larger than 90 °.

[0009] The fourth invention comprises two first rolls arranged at a predetermined distance from each other in the flow direction of the steel bar, and one second roll arranged between the first rolls. The pinch roller according to the first aspect of the present invention, wherein the strip steel is sandwiched between the first roll and the second roll.

As described in connection with the problem to be solved by the invention, when the apex angle 8 of the angle iron 5 in FIG. 4 is smaller than 90 °, the leg portion 7 comes into contact with the first roll 1 first, so that it is floating as a whole. Is a problem. In the present invention, since the apex angle of the convex portion of the angle of the first roll is shaved so as to be smaller than 90 °, even when the angle of the angle of the angle iron is smaller than 90 °, the first roll is formed at the peak of the angle iron 5. 1 and the displacement of the radius of rotation is suppressed. This is particularly effective when the first roll 1 is a drive roll. Second
If the roll 2 is a drive roll, the first roll 1
The same may be performed for the second roll 2. However, the second
Since the roll 2 has a V-shaped groove, the same effect can be obtained in the present invention since the concave portion of the second roll 2 is cut so that the apex angle is larger than 90 °. When both the first roll 1 and the second roll 2 are drive rolls, the present invention may be used for either one or both. Although a pinch roller having a plurality of first rolls 1 and a plurality of second rolls 2 is also conceivable, effects can be obtained by applying the present invention to at least a drive roll.

[0011]

FIG. 1 is an explanatory diagram of an embodiment of the present invention. The basic configuration of the pinch roller for transporting a multi-strip steel includes a first roll 1 and a second roll 2 placed above the first roll 1 such that the first and second rolls 1 and 2 sandwich the strip. It was done. The first roll 1 has the same number as the number of the strips carrying the triangular cross-section convex portions conforming to the angle of the angle iron, and the second roll 2 placed thereon.
Have the same number of strips that carry concave portions (grooves) having a triangular cross section that match the angle of the angle iron. In the conventional pinch roller, the convex portion of the first roll and the concave portion of the second roll have the same 90 ° apex angle as the angle iron, but in the present invention, the first roll 1
Is made smaller than 90 °. As a result, the angle iron conveyed always comes into contact with the first roll 1 at the peak 6, and the radius of rotation of each angle iron with respect to the first roll 1 becomes constant, so that the conveying speed can be constant. . The smaller the vertex angle 3 of the convex portion of the first roll 1 is set to less than 90 °, the more the angled steel having a distorted shape can be brought into contact with the first roll 1 at the peak portion 6. Since the conveyance becomes unstable, the first roll 1
It is preferable that the apex angle 3 of the convex portion is 85 ° or more and less than 90 °.

In the present invention, the apex angle 4 of the concave portion of the second roll 2 is set to be larger than 90 °. As a result, the angle iron conveyed comes into contact with the second roll 2 at the peak 6 at all times, and the radius of rotation of each angle iron with respect to the second roll 2 becomes constant, so that the conveying speed can be constant. . As the apex angle 4 of the concave portion of the second roll 2 is set to be larger than 90 °, the angled steel having a distorted shape can be brought into contact with the second roll 2 at the peak portion 5. Therefore, the vertex angle 4 of the concave portion of the second roll 2 is preferably set to be larger than 90 ° and equal to or smaller than 95 °.

The present invention can be applied to each of the first roll 1 and the second roll 2 alone or both. At this time, magnets (not shown) are provided on the surfaces of the first roll 1 and the second roll 2.
When attached, it is possible to sandwich the steel bar more strongly, which is effective.

The present invention is also applicable to a case where the configuration of the pinch roller itself is changed. FIG. 2 shows another embodiment of the present invention. A total of 3 of the first rolls 1 arranged horizontally in the line direction so that the pinch rollers can be adjusted in the line direction and the second rolls 2 arranged above the first rolls 1
This is the case where the configuration is changed to be composed of the roles. In this case, the second roll 2 is arranged at an arbitrary position above the two first rolls 1, and the second roll 2 is lowered only when used,
The distance between the two first rolls 1 and the rest position of the second roll 2
By adjusting the rolling force at the time of lowering the second roll 2 and sandwiching it with the rolling force suitable for the size of the bar product, it is possible to reliably sandwich even a group of bar members having a difference in thickness. In this pinch roller, the drive roll is the first roll 1, so if the present invention is applied to the two first rolls 1 and the apex angle of the convex portion is smaller than 90 °, the angle of the multiple angle iron Each bar can be fed at a uniform feed speed without being affected by a difference in thickness or a shift in angle, which is very effective. Further, the present invention can be applied to various types of pinch rollers, for example, when the number of first rolls 1 and second rolls 2 is increased.

The pinch roller of the present invention is arranged and used for conveying a plurality of steel bars at the same time, particularly for conveying an angle steel in an inline for straightening and cutting a multi-bar steel. FIG. 3 shows an example in which the pinch roller according to the present invention is applied in-line. When the pinch roller 9 of the present invention is disposed behind the multi-row straightening machine 10, the angle steel 5 which has been straightened and is free from the straightening rolls after the straightening can be surely conveyed at a uniform speed. Further, by disposing the pinch roller 9 of the present invention before and after the cutting machine 11, the conveying speed of each angle iron 5 becomes constant, and a product having a uniform length can be cut.

[0016]

EXAMPLES The effects of the present invention will be specifically described below based on examples.

[Example 1] In an in-line straightening and cutting system for straightening a plurality of steel bars conveyed from a cooling floor at the same time and cutting continuously after straightening, seven angle irons are straightened at the same time, followed by 6 m pieces. The product was cut while running using a traveling cutting machine for the product length. A pinch roller having a pair of rolls, one for each, was arranged before and after the traveling cutting machine to convey the angle iron. The product of the final section (N-cut) and the product immediately before the final section (N-1 cut), which are conveyed by the pinch roller without biting of the straightening machine, have a 90 ° angle matching the shape of the angle iron to be conveyed. The product length after cutting was compared between the case of using the conventional pinch roller having the uneven portion and the case of using the pinch roller of the present invention in which the apex angle of the convex portion of the lower roll was set to 88 °. Was. The drive roll of the pinch roller is the lower roll. The variation when using the conventional pinch roll was 27 to 37 mm / m, but the variation when using the pinch roll of the present invention was 5 mm / m.
Was within.

[Example 2] In an inline straightening and cutting system for straightening a plurality of bar steels conveyed from a cooling floor at the same time and cutting continuously after straightening, seven angle irons are straightened at the same time, followed by 6 m pieces. The product was cut while running using a traveling cutting machine for the product length. A pinch composed of a total of three rolls: two lower rolls arranged horizontally in the line direction so that the lower rolls can adjust the interval before and after the traveling cutting machine, and an upper roll disposed above the lower roll. An angle iron product was cut using a roller. The apex angle of the convex part of the lower roll is 88
° is a pinch roller of the present invention set to °. The variation in product length after cutting was within 2 mm / m.

[0019]

According to the pinch roller of the present invention, when a plurality of angle irons are simultaneously transferred, even if the cross-sectional shape of each angle iron varies within the JIS tolerance range, the transfer speed of each angle iron is reduced. It can be uniform. If used before and after the cutting machine, the variation in the cutting length of the product can be suppressed to a small value. Since it is only necessary to slightly process the roll of the pinch roller currently used, it can be applied to any type of pinch roller and can be immediately applied to the line currently in operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pinch roll according to an embodiment of the present invention as viewed from a line direction.

FIG. 2 is a cross-sectional view taken along a line perpendicular to a line of a pinch roll according to another embodiment of the present invention.

FIG. 3 is a diagram showing an example in which a pinch roller according to the present invention is applied in-line.

FIG. 4 is a cross-sectional view of a conventional pinch roller as viewed from a line direction.

FIG. 5 is an explanatory diagram showing names of respective parts of an angle iron.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st roll 2 2nd roll 3 Vertex angle of the convex part of 1st roll 1 4 Vertex angle of the concave part of 2nd roll 5 5 Angle steel 6 Peak part 7 Leg part 8 Vert angle 9 Pinch roller 10 Multi-straightening machine 11 Running cutting machine

Claims (4)

[Claims] 1. A multi-strip steel transport pinch roller for transporting a strip by sandwiching a strip between a first roll and a second roll, wherein the first roll and the second roll have irregularities conforming to the shape of the angle iron. A pinch roller for conveying a multi-strip steel, wherein the apex angle of the convex portion of the first roll having a convex portion is less than 90 °. 2. A multi-strip steel transport pinch roller for transporting by sandwiching a strip between a first roll and a second roll, wherein the first roll and the second roll have irregularities conforming to the shape of the angle iron. A pinch roller for transporting a multi-strip steel, wherein a vertex angle of the concave portion of the second roll having a concave portion having a chevron portion is greater than 90 °. 3. The pinch roller according to claim 1, wherein a vertex angle of the concave portion of the second roll is larger than 90 °. 4. It comprises two first rolls arranged at a predetermined distance in the flow direction of the bar steel, and one second roll arranged between the first rolls. The pinch roller according to claim 1, wherein the bar is sandwiched by the second roll.