JP2000202531A - Pre-fin guide roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a finger pass guide roll of only one kind adaptable to steel pipes of any kinds and sizes by providing a pair of perpendicular rotatable press rolls which press both sides of a strip formed in U-shape against the upstream part of a fin pass roll stand of a resistance welded tube manufacturing facility to reduce the magnitude of an upper opening of the formed strip. SOLUTION: When a screw shaft 5 is rotated, a first wedge 4 is elevated along guide rails 6, 6, and when the screw shaft is rotated in the reverse direction, the first wedge is lowered. A front side of a second wedge 10 is inclined in a direction opposite to the first wedge 4, and when the first wedge 4 is rotated in a lowering direction, the second wedge 10 is pushed out to a pass line side by the wedge action, and a press roll 9 at a tip of an arm 8 is turned. When an intermediate work of small diameter is guided, the first wedge 4 is rotated in the lowering direction, the press roll 9 is pushed out to the size of the intermediate work. In a case of an intermediate work of large diameter, the first wedge is rotated in the reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefin guide roll for an electric resistance welded steel pipe manufacturing facility.

[0002]

2. Description of the Related Art In an ERW pipe, an intermediate material formed by forming a strip into a U-shape by a break-down path is formed by a prefin guide rod.
It is manufactured by welding the seam with a squeeze roll and a rotating electrode wheel through a screw and a fin pass.

[0003] The pre-fin guide line of the ERW steel pipe manufacturing facility
The U-shaped intermediate member is provided in front of the fin pass roll by deforming the U-shaped intermediate material into a cross section that is easy to bite into the fin pass roll.

[0004] This roll is disclosed in
No. 71310. The roll of this proposal is
A thin-walled steel pipe having a fin portion sandwiched between both edges of the intermediate steel strip, and a roll surface for pressing both edges of the fin portion and the steel strip against the fin portion, and having a large springback. In the case of (1), the problem of not getting stuck in the downstream fin pass roll is to be solved.

[0005]

However, in the case of the above-mentioned fin path guide roll, the intermediate material is pressed from above, so that in the case of a thin material or a thin steel pipe, the tip is bent downward.
For this reason, there is a problem that it does not bite into the fin path roll. To cope with this, a fin path guide roll must be prepared for each pipe size.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a fin path guide roll which can be used for steel pipes of all types and sizes with only one type of fin path guide roll. .

[0007]

According to the present invention, the above object is achieved by the following apparatus.

The roll according to the first aspect of the present invention presses both side surfaces of a U-shaped strip in a break down roll, upstream of a fin pass roll stand of an electric resistance welded steel pipe manufacturing facility, thereby forming a strip. A prefin guide roll having a pair of rotatable vertical pressing rolls for reducing the size of the upper opening.

In this roll, both side surfaces of a U-shaped intermediate member are pressed by a rotatable vertical roll to deform the intermediate member. Therefore, like a conventional fin path guide roll, Even in a thin steel pipe, the tip does not bend downward. Accordingly, the intermediate material is smoothly bitten into the downstream fin pass roll.

A roll according to a second aspect of the present invention comprises a pair of screw shafts erected on both sides of a U-shaped strip, a pair of first wedges engaged with the screw shafts, and the screw shaft. , A pair of arms having one end pivotally connected to the fulcrum shaft, and an inclined surface having one end pivotally mounted in the middle of the arm and engaging the wedge at the other end. And a pressing roll rotatably mounted on a pivot shaft at the other end of the arm.

In the roll according to the second aspect, the first wedge engaged with the pair of screw shafts is engaged with the second wedge having one end pivotally connected between the arms.
Therefore, when the screw shaft is rotated in one direction, the first wedge is lowered, and the arm is rotated inward, that is, toward the intermediate member, through the second wedge. As a result, the pressing roll at the end of the arm pushes the side surface of the intermediate member, and the opening of both upper edges of the intermediate member is reduced. Conversely, if the screw shaft is rotated to the other side, the first wedge rises and the first wedge rises.
The engagement surface of the wedge is separated from the engagement surface of the second wedge. Thus, the pressing roll at the tip of the arm can be rotated toward the screw shaft.

According to a third aspect of the present invention, there is provided a roll having a compression spring engaged between a pair of boss members rotatably attached to a lower end of a pivot shaft of a pressing roll of the second aspect. It is a prefin guide roll.

In this roll, since a compression spring is provided between the pivot shafts of the right and left pressing rolls, when the engagement surface of the first wedge is separated from the engagement surface of the second wedge. The compression spring is extended to rotate the pivot shaft of the pressing roll toward the screw shaft. That is, the operation of returning by hand can be omitted.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a pre-fin guide roll of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG.
4 is a cross-sectional view taken along line BB of FIG. 1.

Reference numeral 1 denotes a mounting frame for a fin pass roll, and mounting columns 2 for a pair of pre-fin guide rolls are provided upright on the left and right sides of the frame 1 with a pass line of an intermediate material interposed therebetween. A concave portion 4 extending vertically in the inner surface of the mounting column 2;
4 are formed. Screw shafts 5 and 5 are rotatably supported at the center positions of the recesses 4 and 4. As shown in FIG. 1, guide rails 6 and 6 extending in the vertical direction are provided at the center of each of the upstream and downstream sides of the recess.
However, they are mounted facing each other.

The lower portion of the screw shaft 5 is a screw portion 5a, and the upper portion is a round bar with no screw. At its upper end, there is formed an eyeglass wrench for turning the screw shaft or an engaging portion 5a for engaging the mouth of a spanner.

The first wedge 4 is screwed into the screw portion 5a of the screw shaft. Engaging grooves extending in the vertical direction are formed on both side surfaces of the first wedge 4. The engagement grooves are fitted to the guide rails 6, 6, and the first wedge 4 is guided and moved. That is, the screw shaft 5 is
When rotated in one direction, the first wedge 4 moves
As a result, the first wedge 4 is lowered along the guide rails 6, 6 when turned in the opposite direction. Also, the right side surface (left side surface) of the first wedge 4, 4 is
It has an inclined surface.

On the other hand, a fulcrum shaft 7 is provided upright on the pass line side of the first wedges 4, 4. This fulcrum shaft 7 is
At its upper and lower portions, it is fixed to the mounting column 2 via mounting pieces. Arms 8, 8 are rotatably attached at one end to the upper and lower positions of the fulcrum shaft 7, and the other end is fixed to a pivot shaft 11. And pressing roll 9
Is rotatably mounted on the pivot shaft via a bearing between the arms 8, 8 of the pivot shaft 11.
Thus, when the pressing roll 9 is pressed by the intermediate material, the pressing roll 9 rotates with the movement of the intermediate material, so that no abrasion is caused on the intermediate material. The second wedge 10 has an upper arc.
The rear end is pivotally connected to the middle of the drum 8 via a pin.

The front surface of the second wedge 10 is an inclined surface inclined in a direction opposite to the inclined surface of the first wedge 4 described above (see FIG. 2). Thus, when the screw shaft 5 is turned in the direction in which the first wedge 4 descends, the second wedge 10 is pushed out to the pass line side by wedge action, and the pressing roll 9 at the tip of the arm 8 is moved. It rotates around the fulcrum shaft 7 toward the pass line. Also, the first wedge 4
When is turned in the ascending direction, the inclined surface retreats and separates from the inclined surface of the second wedge 10. However, in this configuration, when guiding the intermediate material having a larger diameter after guiding the intermediate material having a smaller diameter, the operator must retreat the pressing roll 9 to the screw shaft side.

Therefore, in another example of the present invention, FIG.
As shown in FIG. 3, a boss member 12 having a spring engaging projection 13 is rotatably attached to a lower portion of the left and right pivot shafts 11, 11 via a bush 12a, and a compression spring 14 is provided between the boss members. It is locked. Thus, when the inclined surface of the first wedge 4 is separated from the inclined surface of the second wedge, the pivot shaft 11 is rotated toward the screw shaft by the elastic force of the spring. Second mounted
The wedge 10 moves toward the inclined surface of the first wedge 4, and the inclined surface of the second wedge 10 contacts the inclined surface of the first wedge 4. Therefore, there is no need for a person to retreat the pressing roll, unlike when this configuration is not adopted.

Since the prefin guide roll of the present invention is configured as described above, when guiding the intermediate material of the small-diameter ERW steel pipe, the screw shaft is moved in the direction in which the first wedge descends. Turn and push the pressing roll to the pass line side according to the size of the intermediate material. To guide the intermediate material of the large-diameter ERW steel pipe, rotate the screw shaft in the direction in which the first wedge rises. The pressing roll may be retracted from the pass line side in accordance with the size of the intermediate material.

[0023]

As described above, the present invention has the following advantages.

According to the rolls of the first and second aspects, the intermediate member is pressed and deformed by the rotatable pressing rolls on both side surfaces of the intermediate member. The tip does not bend downward, so that the intermediate material can be smoothly bitten into the fin pass roll.

According to the third aspect of the present invention, when guiding a large-diameter intermediate member, there is no need for a person to manually retract the pressing roll. That is, labor can be saved.

[Brief description of the drawings]

FIG. 1 is a plan view of a pre-fin guide roll of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line CC of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting frame of fin path roll 2 Mounting column 4 First wedge 5 Screw shaft 6 Guide rail 7 Support shaft 8 Arm 9 Pressing roll 10 Second wedge 11 Pilot shaft 12 Boss member 14 Compression spring

Continued on the front page (72) Inventor Kuniyasu Oishi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term in Nihon Kokan Co., Ltd. (reference) 4E028 CA01 CA07 4E063 AA01 BB05 EA12 EA20

Claims (3)

[Claims] 1. A break down roll presses both side surfaces of a U-shaped strip at a position upstream of a fin pass roll stand of an electric resistance welded steel pipe manufacturing facility, and adjusts a size of an upper opening of the formed strip. A prefin guide roll having a pair of rotatable vertical pressing rolls for reduction. 2. A pair of screw shafts erected on both sides of a U-shaped strip, a pair of first wedges engaged with the screw shafts, and a fulcrum erected inside the screw shafts. A shaft, a pair of arms having one end pivotally connected to the fulcrum shaft, and a second wedge having one end pivotally mounted in the middle of the arm and having an inclined surface at the other end engaging with the wedge; 2. A pre-fin guide roll according to claim 1, further comprising a pressing roll rotatably attached to the other end of said arm. 3. The pre-fin guide roll according to claim 2, further comprising a compression spring locked between a pair of boss members rotatably attached to lower ends of pivot shafts of the pressing rolls on both sides.