Apparatus for correcting of steel pipe

Abstract

The present invention relates to a straightening device for a square steel pipe, wherein the straightening efficiency of the square steel pipe can be improved by providing a straightening pressure using respective roll bending mechanisms from the upper and lower sides and left and right sides while passing through the first and second main straightening sections composed of multiple stages for sizing straightening of the square steel pipe, and the structure is improved to allow for rapid adjustment of the spacing between the first and second guide rolls of a width guide means that guides the side portion of the square steel pipe entering the first and second main straightening sections through the inlet side toward the center side. The present invention relates to a straightening device for square steel pipes with an improved structure that is equipped with a pair of left and right upper rolls, so that it can accommodate the width dimensions of the square steel pipe without the need to replace the upper roll bending mechanism even if the size dimensions of the square steel pipe change. The present invention relates to a straightening device for a square steel pipe, the structure of which is improved to enable rapid width setting work by using a moving motor and a moving cylinder of a width guide adjustment means that adjusts the width of guide mechanisms guiding the entry movement of the square steel pipe from the side, and to stably support both side portions of the square steel pipe to guide the entry movement of the square steel pipe. The present invention relates to a straightening device for a square steel pipe, the structure of which is improved so that when bending deformation remains uncorrected in a square steel pipe passing through an outlet after the straightening work is completed, the bending deformation of the square steel pipe can be corrected during the process of moving back to the inlet side using a bending straightening unit provided on the front or rear side of the first and second main straightening units. The present invention for implementing this comprises: first upper and lower conveying rolls positioned at the upper and lower sides of an inlet where a square steel pipe is conveyed and which move the square steel pipe toward a first main straightening unit; a first main straightening unit that straightens the square steel pipe entered from the first upper and lower conveying rolls using a first upper and lower roll bending mechanism and a first left and right roll bending mechanism; a second main straightening unit equipped with a second upper and lower roll bending mechanism and a second left and right roll bending mechanism to re-straighten the square steel pipe that has passed through the first main straightening unit; and second upper and lower conveying rolls positioned at the upper and lower sides of an outlet to discharge the sized square steel pipe that has passed through the second main straightening unit to the outside of the outlet. The width guide adjustment means is characterized by comprising: a width adjustment part on one side that is moved by the rotational driving force of a motor to guide the side portion of a square steel pipe conveyed by the second upper and lower conveying rolls, and a width adjustment part on the other side that pushes the square steel pipe toward the width adjustment part on the one side by the moving force of a cylinder.

Description

Technology Field

[0001] The present invention relates to a straightening device for square steel pipes, and more specifically, to a straightening device for square steel pipes in which the straightening efficiency of the square steel pipe can be improved by providing a straightening pressure using a roll bending mechanism from the upper and lower sides and left and right sides while passing through first and second main straightening sections composed of multiple stages for sizing straightening of the square steel pipe, and the structure is improved to allow for rapid adjustment of the guide roll spacing of a width guide means that guides the side portion of the square steel pipe entering the first and second main straightening sections through the inlet side and directs it toward the center side.

[0002] The present invention relates to a straightening device for square steel pipes with an improved structure that is equipped with a pair of left and right upper rolls, so that it can accommodate the width dimensions of the square steel pipe without the need to replace the upper roll bending mechanism even if the size dimensions of the square steel pipe change.

[0003] The present invention relates to a straightening device for a square steel pipe, the structure of which is improved to enable rapid width setting work by using a moving motor and a moving cylinder of a width guide adjustment means that adjusts the width of guide mechanisms guiding the entry movement of the square steel pipe from the side, and to stably support both side portions of the square steel pipe to guide the entry movement of the square steel pipe.

[0004] The present invention relates to a straightening device for a square steel pipe, the structure of which is improved so that when bending deformation remains uncorrected in the square steel pipe passing through the outlet after the straightening work is completed, the bending deformation of the square steel pipe can be re-corrected during the process of moving back to the inlet side using the bending straightening unit provided in the first and second main straightening units. Background Technology

[0005] Generally, square steel pipes are used as columns for buildings and are manufactured by using thick steel plates as the material and cold-press bending them.

[0006] Square steel pipes manufactured by cold press bending are produced by forming the cross-sectional shape of thick steel plates into a square or U-shape by press bending, and joining them by submerged arc welding.

[0007] As for the prior art related to a straightening device for existing square steel pipes, as disclosed in Korean Registered Patent Publication No. 10-2576184, "Method for Manufacturing a Square Steel Pipe," filed by the applicant, it includes a final bending step in which a center portion bent in one direction is bent by applying pressure in the other direction using a pressure mechanism, and the left and right side walls of the square steel pipe are pressed using a side bending mechanism to bend the opened opening to close; wherein the final bending step comprises an inner mold having connecting blocks that are selectively detachably coupled to both outer sides to adjust the width of downward pressure applied to the inner bottom surface of the square steel pipe by a pressure transmitted from an upper bending mechanism and contacting the inner bottom surface of the square steel pipe, a pressure mechanism having a connector that is positioned on the upper side of the square steel pipe, enters the interior of the square steel pipe through an opening, and connects the upper side of the inner mold to the upper bending mechanism, and pressure applied from both the left and right sides of the square steel pipe Bending is performed using side bending mechanisms provided on the left and right vertical frame sides, respectively.

[0008] As other prior art related to a straightening device for existing square steel pipes, as disclosed in the previously filed Korean Registered Patent Publication No. 10-2619237, "Equipment for Manufacturing Square Steel Pipes," the apparatus for manufacturing square steel pipes comprises an edge milling means, a press bending means, a final bending means, inner and outer welding means, and a straightening means for manufacturing a plate material into a square steel pipe, wherein the final bending means comprises a first guide roller that guides a square steel pipe formed to have an opening on one side to enter and exit a center position via the press bending means, a side bending mechanism provided on the left and right sides respectively to provide a pressing force from both the left and right sides of the square steel pipe, an inner mold having a connecting block that contacts the inner bottom surface of the square steel pipe and is selectively detachably coupled to both outer sides to adjust the width while pressing the inner bottom surface of the square steel pipe downward with a pressing force transmitted from an upper bending mechanism, and the square steel pipe The straightening means is provided with a straightening frame that is positioned on the upper side and enters the interior of the square steel pipe through the opening, and is provided with a connecting member that connects the upper side of the inner mold and the upper bending mechanism. The straightening means is provided with a straightening frame that is positioned vertically on both the left and right sides and is equipped with a side straightening pressure mechanism, a connecting frame that is connected horizontally to the upper side of the straightening frame and is equipped with an upper straightening pressure mechanism that provides a straightening pressure force from the upper side downward, and a straightening device composed of a rotating roller that conveys the square steel pipe in the longitudinal direction. The upper straightening pressure mechanism is provided with a central liner that is arranged to press the center of the upper surface of the square steel pipe during a downward movement from the upper side of the square steel pipe, and left and right liners that are positioned spaced apart from each other on both the left and right sides of the central liner and are arranged to press the left and right sides of the upper surface of the square steel pipe during a downward movement.

[0009] However, existing straightening devices for square steel pipes are equipped with upper and lower and left and right roll bending mechanisms that transmit compressive force from the upper, lower, left, and right sides, respectively, for straightening the square steel pipes. In this case, if the size of the square steel pipe changes during the bending and straightening process, the upper roll bending mechanism must be replaced with the one corresponding to the appropriate size, which has the disadvantage of taking a long time to complete.

[0010] In addition, existing straightening devices for square steel pipes are equipped with width guide adjustment means that guide the center-side entry movement of the square steel pipe from both the left and right sides; however, they have the disadvantage of not being able to precisely set the spacing of the guide mechanisms to match the left and right spacing of the square steel pipe, and they also have the disadvantage of requiring a long working time to set the appropriate spacing when the size dimensions of the square steel pipe are changed.

[0011] In addition, if bending deformation is not corrected and remains after the straightening work is completed, there is a risk that bending deformation with height differences may occur in different parts of the square steel pipe. Prior art literature

[0012] Korean Registered Patent Publication No. 10-2576184 "Method for manufacturing square steel pipes" Korean Registered Patent Publication No. 10-2619237 "Apparatus for manufacturing square steel pipes" The problem to be solved

[0013] The present invention was created to address the aforementioned problems, and its first objective is to provide a straightening device for square steel pipes with an improved structure that can improve the straightening efficiency of square steel pipes by providing straightening pressure using respective roll bending mechanisms from the upper, lower, left, and right sides while passing through first and second main straightening sections composed of multiple stages for sizing straightening of square steel pipes, and to rapidly adjust the spacing of guide rolls of a width guide means that guides the side portion of the square steel pipe entering the first and second main straightening sections through the inlet side toward the center side.

[0014] The second objective of the present invention is to provide a straightening device for square steel pipes with an improved structure that can accommodate the width dimensions of the square steel pipes without the need to replace the upper roll bending mechanism, by providing a pair of left and right upper rolls.

[0015] The third objective of the present invention is to provide a straightening device for a square steel pipe with an improved structure that allows for rapid width setting work by utilizing a moving motor and a moving cylinder of a width guide adjustment means that adjusts the width of guide mechanisms guiding the entry movement of the square steel pipe from the side, and also allows for guiding the entry movement of the square steel pipe by stably supporting both side portions of the square steel pipe.

[0016] The fourth objective of the present invention is to provide a straightening device for a square steel pipe with an improved structure that can correct the bending deformation of the square steel pipe by using a bending straightening unit provided on the front or rear side of the first and second main straightening units when bending deformation with a height difference in different parts of the square steel pipe passing through the outlet occurs after the straightening work is completed, and the pipe moves back to the inlet side. means of solving the problem

[0017] The present invention for achieving the above-mentioned purpose comprises: first upper and lower conveying rolls positioned at the upper and lower sides of an inlet where a square steel pipe is conveyed and which move the square steel pipe toward a first main straightening unit; a first main straightening unit that straightens the square steel pipe entered from the first upper and lower conveying rolls using a first upper and lower roll bending mechanism and a first left and right roll bending mechanism; a second main straightening unit equipped with a second upper and lower roll bending mechanism and a second left and right roll bending mechanism to re-straighten the square steel pipe that has passed through the first main straightening unit; and second upper and lower conveying rolls positioned at the upper and lower sides of an outlet to discharge the sized square steel pipe that has passed through the second main straightening unit to the outside of the outlet. The device is equipped with a width guide adjustment means comprising a one-sided width adjustment part that moves by the rotational driving force of a motor to guide the side portion of a square steel pipe being transported to enter the first upper and lower conveying rolls through the inlet side, and a other-sided width adjustment part that pushes the square steel pipe toward the one-sided width adjustment part by the moving force of a cylinder; wherein the first and second upper roll bending mechanisms are characterized by being composed of left and right upper rolls that are moved in the left and right directions by a gap adjustment cylinder to adjust the gap between them.

[0018] Another characteristic element of the present invention is a first upper and lower conveying roll positioned at the upper and lower sides of an inlet through which a square steel pipe is conveyed and which moves the square steel pipe toward a first main straightening unit; a first main straightening unit that straightens the square steel pipe entered from the first upper and lower conveying rolls using a first upper and lower roll bending mechanism and a first left and right roll bending mechanism; a second main straightening unit equipped with a second upper and lower roll bending mechanism and a second left and right roll bending mechanism to re-straighten the square steel pipe that has passed through the first main straightening unit; and a second upper and lower conveying roll positioned at the upper and lower sides of an outlet to discharge the sized square steel pipe that has passed through the second main straightening unit to the outside of the outlet. The invention is characterized by comprising a width guide adjustment means consisting of a one-sided width adjustment part that is moved by the rotational driving force of a motor to guide a side portion of a square steel pipe being conveyed to enter the first upper and lower conveying roll side through the inlet side, and a other-sided width adjustment part that pushes the square steel pipe toward the one-sided width adjustment part by the moving force of a cylinder; wherein the first and second main correction parts are positioned at the front or rear side of the first and second main correction parts to correct the height-direction bending deformation of the square steel pipe after sizing is completed, and a bending correction part having upper and lower bending correction rolls that respectively adjust the upper and lower heights according to the bending deformation of the square steel pipe.

[0019] The above-mentioned first and second left and right roll bending mechanisms are designed to move in the left and right directions by means of a support cylinder to adjust the mutual spacing when the width size of the square steel pipe varies.

[0020] One side width adjustment unit of the width guide adjustment means comprises a servo motor to support one side of a square steel pipe entering from the inlet side to the first upper and lower transfer roll side, a gearbox that receives rotational driving force from the servo motor and moves a transfer shaft in the left and right directions, a transfer shaft that is axially coupled to the gearbox and moves in the left and right directions by the rotational driving force of the servo motor and moves a first support block coupled by a screw, and a first support block provided with a first guide roll that moves in the left and right directions by the transfer shaft and guides and supports one side of the square steel pipe, and the other side width adjustment unit of the width guide adjustment means comprises a moving cylinder and a second support block that moves in the left and right directions by the moving cylinder and is provided with a second guide roll that guides and supports the other side of the square steel pipe and pushes the square steel pipe toward the first support block side when moving in the right direction.

[0021] The width guide adjustment means further comprises an encoder that detects the driving of the servo motor to adjust the travel distance of the first support block, and a pressure sensor that detects the pressure of a moving cylinder in contact with the other side of the square steel pipe when the second support block moves, and transmits the detected pressure information to the control unit. Effects of the invention

[0022] The present invention allows for the sizing of square steel pipes to be performed by dividing the first and second straightening stages into multiple stages of the first and second main straightening sections, thereby reducing excessive straightening load and performing precise straightening work. Additionally, by configuring the first and second upper roll bending mechanisms of the first and second main straightening sections into multiple parts divided into left and right sides, the width size range of the first and second upper roll bending mechanisms is expanded even if the width size of the square steel pipe changes, thereby providing the advantage of being usable without the need to replace the rolls.

[0023] In addition, the present invention has the useful advantage of being able to quickly guide the side portion of a square steel pipe during the entry operation at the inlet side of the square steel pipe by using a width guide adjustment means utilizing a servo motor and a moving cylinder.

[0024] The present invention has a useful advantage in that, by arranging a bending correction unit on the front or rear side of the first and second main correction units, if the bending deformation of a square steel pipe drawn out to the exit side after the sizing work is completed remains uncorrected, the bending deformation can be corrected by passing the square steel pipe with uncorrected bending deformation through the upper and lower bending correction rolls of the bending correction unit while re-entering it to the exit side and drawing it out to the inlet side. Brief explanation of the drawing

[0025] FIG. 1 is a schematic diagram showing a straightening device for a square steel pipe according to the present invention. FIG. 2 is a side view of FIG. 1. FIGS. 3a and 3b are schematic diagrams showing the configuration of the first and second main straightening sections of the present invention, respectively, and showing the operating states of the first and second upper roll bending mechanisms and the left and right roll bending mechanisms according to the width change of square steel pipes of different size dimensions. FIG. 4 is a front view of the width guide adjustment means of the present invention. FIG. 5 is a plan view showing the width guide adjustment means of the present invention. FIG. 6 is a schematic diagram showing the state in which bending deformation occurs in the square steel pipe of the present invention. Specific details for implementing the invention

[0026] In describing the present invention, if it is determined that a detailed description of related prior art or configurations could unnecessarily obscure the essence of the invention, such detailed description will be omitted. Furthermore, the terms described below are defined considering their functions in the present invention and may vary depending on the user's intent or convention. Therefore, their definitions should be based on the content throughout this specification. Additionally, the term "comprising" a component means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0027] A straightening device (100) for a square steel pipe according to the present invention, described with reference to FIGS. 1 to 6, comprises: first upper and lower transfer rollers (210, 220) positioned at the upper and lower sides of an inlet where a square steel pipe (10) is conveyed and which move the square steel pipe (10) toward a first main straightening unit (110); and a first main straightening unit (110) that straightens the square steel pipe (10) introduced from the first upper and lower transfer rollers (210, 220) using a first upper and lower roll bending mechanism (112, 114) and a first left and right roll bending mechanism (115). The apparatus comprises: a second main straightening unit (120) equipped with a second upper and lower roll bending mechanism (122, 124) and a second left and right roll bending mechanism (125) to re-straighten a square steel pipe (10) that has passed through the first main straightening unit (110); second upper and lower transfer rolls (230, 240) positioned on the upper and lower sides of the outlet to discharge the square steel pipe (10) that has been sized and passed through the second main straightening unit (120) to the outside of the outlet; and a width guide adjustment means (500) composed of a one-sided width adjustment unit that moves by the rotational driving force of a motor to guide the side portion of the square steel pipe (10) that is transferred to enter the first upper and lower transfer rolls (210, 220) through the inlet side, and a other-sided width adjustment unit that pushes the square steel pipe (10) toward the one-sided width adjustment unit by the moving force of a cylinder.

[0028] Referring to FIGS. 1 and 2, the straightening device (100) of the present invention has a frame positioned on the upper side of a base bed (50) installed on the floor, and first and second main straightening sections (110, 120) are installed within each frame, and a plurality of moving rollers are provided to support the lower side of a square steel pipe (10) and move the square steel pipe (10) from the inlet to the outlet in the longitudinal direction.

[0029] The first main straightening unit (110) has a first upper and lower roll bending mechanism (112, 114) arranged on the upper and lower sides within the frame, and a first left and right roll bending mechanism (115) arranged on the left and right sides of the first upper and lower roll bending mechanism (112, 114), and has the function of first applying pressure straightening to the square steel pipe (10) from the upper, lower, left, and right sides.

[0030] The second main straightening unit (120) is positioned at a location spaced apart from the first main straightening unit (110), and a second upper and lower roll bending mechanism (122, 124) is positioned on the upper and lower sides within the frame to apply secondary pressure straightening to the square steel pipe (10) that has passed through the first main straightening unit (110), and a second left and right roll bending mechanism (125) is positioned on the left and right sides of the second upper and lower roll bending mechanism (122, 124) to have the function of applying pressure straightening to the square steel pipe (10) from the upper, lower, left, and right sides.

[0031] In addition, as shown in FIG. 3a and FIG. 3b, the first and second main straightening units (110, 120) are composed of multiple roll-shaped left and right upper rolls (112A, 112B) (122A, 122B) in which the first and second upper roll bending mechanisms (112, 122) are moved to the left and right by a spacing adjustment cylinder (130) to adjust the spacing between them, thereby having the advantage of being able to straighten square steel pipes (10) of various sizes without replacing the upper roll bending mechanism even if the width size of the square steel pipe (10) varies.

[0032] In addition, when the width size of the square steel pipe (10) is varied, the distance between the left and right roll bending mechanisms (115, 125) is adjusted by a support cylinder (140) that moves the left and right roll bending mechanisms (115, 125) in the left and right directions.

[0033] As shown in FIGS. 1 and 2, the first and second main correction units (110, 120) are positioned at the front or rear side of the first and second main correction units (110, 120) to correct the height-direction bending deformation of the square steel pipe (10) that has been sized, and further have a bending correction unit (400) equipped with upper and lower bending correction rollers (410, 420) that respectively adjust the upper and lower heights according to the bending deformation of the square steel pipe (10).

[0034] The above bending correction unit (400) performs the function of correcting the bending deformation in the height direction of the square steel pipe (10) through the bending correction unit (400) when the square steel pipe (10) that has passed through the outlet has residual bending deformation as shown in FIG. 6, and a bending deformation part (10-1) that is bent in the height direction of each part of the square steel pipe (10) occurs, by adjusting the height of the upper and lower bending correction rolls (410, 420) of the bending correction unit (400) and moving the square steel pipe (10) back to the inlet side through the outlet in the reverse direction.

[0035] For example, if a portion of the square steel pipe (10) experiences downward bending deformation, the height of the lower bending correction roll (420) of the bending correction unit (400) is raised to correct the bending deformation, and if a portion of the square steel pipe (10) experiences upward bending deformation, the height of the upper bending correction roll (410) is lowered to correct the bending deformation.

[0036] Referring to FIGS. 4 and 5, the width adjustment portion of the width guide adjustment means (500) performs the function of supporting one side of a square steel pipe (10) that enters from the entrance side to the first upper and lower transfer rolls (210, 220), and is composed of a servo motor (510), a gearbox (520) that receives the rotational driving force of the servo motor (510) and moves the transfer shaft (530) in the left and right directions, a transfer shaft (530) that is axially coupled to the gearbox (520) and moves the first support block (540) that is screw-coupled and moves the first support block (540) by the rotational driving force of the servo motor (510), and a first guide roll (550) that moves the first side of the square steel pipe (10) by the transfer shaft (530).

[0037] Additionally, the other side width adjustment part of the width guide adjustment means (500) is composed of a moving cylinder (560), a second guide roll (580) that is moved in the left and right directions by the moving cylinder (560) and guides and supports the other side of the square steel pipe (10), and a second support block (570) that pushes the square steel pipe (10) toward the first support block (540) when moved in the right direction.

[0038] The above servo motor (510) converts the rotational driving force of the motor into linear driving force through the gearbox (520) and transmits it to the transfer shaft (530), and the transfer shaft (530) moves the first support block (540) in the left and right directions using the screw threads (535) formed on the outer surface.

[0039] Additionally, the width guide adjustment means (500) supports one side of the square steel pipe (10) so that the first guide roll (550) can be brought into contact with one side of the square steel pipe (10) at an accurate position through the left and right movement of the first support block (540) to guide the entry movement of the square steel pipe (10) to the entrance side of the square steel pipe (10), and by using the moving cylinder (560) to move the second support block (570) toward the square steel pipe (10) so that the second guide roll (580) is brought into contact with the other side of the square steel pipe (10), the square steel pipe (10) is pushed and pressed against the first guide roll (550) side, thereby guiding the entry movement of the square steel pipe (10) to the center position of the first and second main correction parts (110, 120).

[0040] The above width guide adjustment means (500) further comprises an encoder (512) that detects the driving of the servo motor (510) to adjust the moving distance of the first support block (540), and a pressure sensor (590) that detects the pressure of a moving cylinder (560) that contacts the other side of the square steel pipe (10) when the second support block (570) moves, and transmits the detected pressure information to a control unit (not shown).

[0041] The pressure sensor (590) above assists the control unit in controlling the operation of the moving cylinder (560) by adjusting the load movement distance of the moving cylinder (560).

[0042] Additionally, the width guide adjustment means (500) further includes a detection sensor (515) that detects the movement distance of the first support block (540) and transmits the detected information to the control unit so that the control unit can control the driving of the servo motor (510).

[0043] The unexplained symbols "114a, 124a" in FIG. 3 represent circumferential grooves (114a, 124a) that are formed concavely along the outer circumference of the first and second lower roll bending mechanisms (114, 124), respectively, and guide the protruding weld bead portion of the square steel pipe (10).

[0044] The present invention, having such a configuration, performs a sizing operation of a square steel pipe (10) by passing through a plurality of first and second main straightening sections (110, 120) while the square steel pipe (10) is being straightened using a roll-to-roll straightening device (100), and through first and second upper and lower roll bending mechanisms (112, 114) (122, 124) and first and second left and right roll bending mechanisms (115) (125).

[0045] At this time, as the square steel pipe (10) passes through the first main straightening unit (110) that performs the first straightening step and the second main straightening unit (120) that performs the second straightening step, a straightening pressure is transmitted from the top, bottom, left, and right sides in a roll-to-roll manner, thereby enabling the sizing operation of the square steel pipe (10).

[0046] The above-mentioned square steel pipe (10) is guided to a center position by a width guide adjustment means for entry into the straightening device (100) and is carried out by the first upper and lower transfer rollers (210, 220) provided on the upper and lower sides of the entrance side, and the exit side extraction operation of the square steel pipe (10) that has passed through the second main straightening section (120) is carried out by the second upper and lower transfer rollers (230, 240) provided on the upper and lower sides of the exit side.

[0047] In addition, the width guide adjustment means (500) of the present invention allows the rotational driving force of the servo motor (510) of the width adjustment part on one side (right side in FIG. 4) to be transmitted to the first support block (540) through the gearbox (520) and the transfer shaft (530), thereby enabling the movement distance of the first support block (540) to be precisely set by the screw thread (535) of the transfer shaft (530) and the screw fastening method of the first support block (540). Furthermore, the width adjustment part on the other side (left side in FIG. 4) can rapidly move the second support block (570) by using the moving cylinder (560) to move the second support block (570) toward the square steel pipe (10) located on the right side of the drawing, and the second guide roll (580) is in contact with the other side of the square steel pipe (10), and the one side of the square steel pipe (10) is pressed against the first guide roll (550) so that the square steel pipe (10) It has the advantage of being able to quickly perform the operation of the width guide adjustment means (500) that guides the entry operation on the entrance side.

[0048] In addition, the bending correction unit (400) of the present invention performs the function of correcting the height-direction bending deformation of the square steel pipe (10) while moving the square steel pipe (10) back to the inlet side through the outlet in the reverse direction, by adjusting the height of the upper and lower bending correction rolls (410, 420) of the bending correction unit (400) to correspond to the displacement difference where bending deformation occurred before transporting the square steel pipe (10) from the outlet side back to the inlet side, when the square steel pipe (10) that has passed through the outlet remains without bending deformation as shown in FIG. 6.

[0049] As shown in FIG. 6, the bending correction unit (400) of the present invention corrects the bending deformation of the square steel pipe (10) by raising the height of the lower bending correction roll (420) to correct the bending deformation when the bending deformation unit (10-1) is formed to sag downward, and conversely corrects the bending deformation of the square steel pipe (10) by lowering the height of the upper bending correction roll (410) when the bending deformation unit (10-1) is formed to bend upward.

[0050] Accordingly, the present invention allows the sizing operation of a square steel pipe (10) to be performed by dividing the first and second straightening stages into multiple stages of the first and second main straightening units (110, 120), thereby reducing the excessive straightening load and performing precise straightening operations. In addition, the first and second upper roll bending mechanisms (112, 122) of the first and second main straightening units (110, 120) are configured as multiple units divided into left and right sides, so that even if the width size of the square steel pipe (10) changes, the width size range of the first and second upper roll bending mechanisms (112, 122) is expanded, and the pipe has the advantage of being usable without the need to replace the rolls.

[0051] In addition, the present invention has the useful advantage of being able to quickly guide the side portion of the square steel pipe (10) during the entry operation of the square steel pipe (10) by using a width guide adjustment means (500) utilizing a servo motor (510) and a moving cylinder (560).

[0052] The present invention has a useful advantage in that, by placing a bending correction unit (400) on the front or rear side of the first and second main correction units (110, 120), if the bending deformation of the square steel pipe (10) drawn out to the outlet side after the sizing work is completed remains uncorrected, the bending deformation can be corrected by passing the square steel pipe (10) with uncorrected bending deformation through the upper and lower bending correction rollers (410, 420) of the bending correction unit (400) while drawing it back into the outlet side and moving it in reverse toward the inlet side.

[0053] As such, specific embodiments have been described in the detailed description of the present invention, and the scope of the present invention should not be limited to the embodiments described above, but should be defined by the claims set forth below as well as equivalents thereof.

[0054] In other words, the present invention as described above is not limited to the specific preferred embodiments described above, and anyone with ordinary knowledge in the technical field to which the invention pertains can make various modifications without departing from the essence of the invention claimed in the claims, and such modifications will be within the scope of the claims. Explanation of the symbols

[0055] 10 : Rectangular steel pipe 50 : Base bed 100: Calibration device 110, 120: 1st and 2nd main calibration sections 112: First upper roll bending mechanism 114: First lower roll bending mechanism 122: Second upper roll bending mechanism 124: Second lower roll bending mechanism 112A, 112B, 122A, 122B: Left and right upper rolls 130 : Gap adjustment cylinder 140 : Support cylinder 210, 220, 230, 240: 1st, 2nd upper, and lower transfer rolls 400: Bending correction unit 410, 420: Upper and lower bending correction rollers 500 : Width guide adjustment means 510 : Servo motor 512: Encoder 515: Detection sensor 520 : Gearbox 530 : Feed shaft 535 : Screw thread 540 : First support block 550: 1st guide roll 560: Moving cylinder 570: Second support block 580: Second guide roll 590 : Pressure sensor

Claims

Claim 1 A first upper and lower conveying roller (210, 220) positioned at the upper and lower sides of the entrance where the square steel pipe (10) is conveyed and which moves the square steel pipe (10) toward the first main straightening unit (110); a first main straightening unit (110) that straightens the square steel pipe (10) introduced from the first upper and lower conveying roller (210, 220) using a first upper and lower roller bending mechanism (112, 114) and a first left and right roller bending mechanism (115); a second main straightening unit (120) equipped with a second upper and lower roller bending mechanism (122, 124) and a second left and right roller bending mechanism (125) to re-straighten the square steel pipe (10) that has passed through the first main straightening unit (110); and a sized square pipe that has passed through the second main straightening unit (120). A straightening device for a square steel pipe, comprising: second upper and lower conveying rollers (230, 240) positioned on the upper and lower sides of the outlet to discharge the steel pipe (10) to the outside of the outlet; and a width guide adjusting means (500) composed of a side width adjusting part that is moved by the rotational driving force of a motor to guide the side portion of the square steel pipe (10) being conveyed to enter the first upper and lower conveying rollers (210, 220) through the inlet side, and a side width adjusting part that pushes the square steel pipe (10) toward the side width adjusting part by the moving force of a cylinder; wherein the first and second upper roller bending mechanisms (112, 122) are composed of left and right upper rollers (112A, 112B) (122A, 122B) that are moved in the left and right directions by a gap adjusting cylinder (130) to adjust the gap between them. Claim 2 A first upper and lower conveying roller (210, 220) positioned at the upper and lower sides of the entrance where the square steel pipe (10) is conveyed and which moves the square steel pipe (10) toward the first main straightening unit (110); a first main straightening unit (110) that straightens the square steel pipe (10) introduced from the first upper and lower conveying roller (210, 220) using a first upper and lower roller bending mechanism (112, 114) and a first left and right roller bending mechanism (115); a second main straightening unit (120) equipped with a second upper and lower roller bending mechanism (122, 124) and a second left and right roller bending mechanism (125) to re-straighten the square steel pipe (10) that has passed through the first main straightening unit (110); and a sized square pipe that has passed through the second main straightening unit (120). Second upper and lower conveying rollers (230, 240) positioned above and below the outlet to discharge the steel pipe (10) to the outside of the outlet; A straightening device for a square steel pipe, comprising: a width guide adjusting means (500) configured to guide a side portion of a square steel pipe (10) that is conveyed to enter the first upper and lower conveying rolls (210, 220) through the inlet side by the rotational driving force of a motor, and a width adjusting part that pushes the square steel pipe (10) toward the one side width adjusting part by the moving force of a cylinder; wherein the first and second main straightening parts (110, 120) are positioned at the front or rear side of the first and second main straightening parts (110, 120) to correct the height-direction bending deformation of the square steel pipe (10) that has been sized, and a bending correction part (400) equipped with upper and lower bending correction rolls (410, 420) that respectively adjust the upper and lower heights according to the bending deformation of the square steel pipe (10). Claim 3 A straightening device for a square steel pipe according to claim 1 or claim 2, wherein the first and second left and right roll bending mechanisms (115, 125) are moved in the left and right directions by a support cylinder (140) to adjust the mutual spacing when the width size of the square steel pipe (10) is varied. Claim 4 In claim 1 or claim 2, one side width adjustment portion of the width guide adjustment means (500) is composed of a servo motor (510) to support one side of a square steel pipe (10) entering from the inlet side to the first upper and lower transfer rolls (230, 240), a gearbox (520) that receives the rotational driving force of the servo motor (510) and moves a transfer shaft (530) in the left and right directions, a transfer shaft (530) that is axially coupled to the gearbox (520) and moves in the left and right directions by the rotational driving force of the servo motor (510) and moves a screw-coupled first support block (540), and a first support block (540) provided with a first guide roll (550) that moves in the left and right directions by the transfer shaft (530) and guides and supports one side of the square steel pipe (10), and the other side width adjustment portion of the width guide adjustment means (500) A straightening device for a square steel pipe, characterized by comprising a moving cylinder (560), a second guide roll (580) that is moved in the left and right directions by the moving cylinder (560) and guides and supports the other side of the square steel pipe (10), and a second support block (570) that pushes the square steel pipe (10) toward the first support block (540) when moved in the right direction. Claim 5 A straightening device for a square steel pipe according to claim 4, wherein the width guide adjustment means (500) further comprises an encoder (512) that detects the driving of the servo motor (510) to adjust the moving distance of the first support block (540), and a pressure sensor (590) that detects the pressure of a moving cylinder (560) that contacts the other side of the square steel pipe (10) when the second support block (570) moves, and transmits the detected pressure information to the control unit.

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