KR102591023B1 - Apparatus for correcting of steel pipe - Google Patents

Abstract

The present invention can easily correct the crown deformation of a square steel pipe by transmitting the pressing force of the hydraulic cylinder from the inner side of the square steel pipe to the outside, and is a correction of the inner side of the square steel pipe with an improved structure to reduce the spatial constraints required for correction work. To provide a device.
In addition, the present invention uses the first, second, third, and square members corresponding to the shape of the inner edge of the square steel pipe to adjust the coupling position with the inclined portion formed inclined at the end of the moving bar, ,3,By adjusting the pressing force transmitted from the inner part of the square steel pipe to the outside using the method of changing the spacing of the square members, the crown of the square steel pipe is deformed by the pressing force that pushes the inner edge from the inner part of the square steel pipe in the diagonal direction. This relates to a device for correcting the inner part of a square steel pipe with an improved structure so that it can be easily corrected.

Description

Internal correction device for square steel pipe {APPARATUS FOR CORRECTING OF STEEL PIPE}

The present invention relates to a device for correcting the inner side of a square steel pipe. In particular, the crown deformation of the square steel pipe can be easily corrected by transmitting the pressing force of the hydraulic cylinder from the inner side of the square steel pipe to the outside, and the spatial constraints required for the correction work can be reduced. The purpose is to provide a correction device for the inner part of a square steel pipe with an improved structure.

In addition, the present invention uses the first, second, third, and square members corresponding to the shape of the inner edge of the square steel pipe to adjust the coupling position with the inclined portion formed inclined at the end of the moving bar, ,3,By adjusting the pressing force transmitted from the inner part of the square steel pipe to the outside using the method of changing the spacing of the square members, the crown of the square steel pipe is deformed by the pressing force that pushes the inner edge from the inner part of the square steel pipe in the diagonal direction. This relates to a device for correcting the inner part of a square steel pipe with an improved structure so that it can be easily corrected.

In general, structural structural members used in large-scale buildings such as factories, warehouses, and commercial facilities are being strengthened to reduce construction costs by reducing the weight.

In particular, rectangular steel pipes used as building pillars are required to have a yield strength of 385 MPa or more and a tensile strength of 520 MPa or more. In addition, from the viewpoint of earthquake resistance, high plastic deformation ability and excellent toughness are also required.

Rectangular steel pipes with such high deformation performance and excellent toughness are generally made of hot rolled steel sheets (steel strips) or thick steel sheets, and are manufactured by cold press bending or roll forming.

Rectangular steel pipes manufactured by cold press bending are manufactured by forming thick steel plates into a ㅁ-shaped or ㄷ-shaped cross-sectional shape by press bending and joining them by submerged arc welding.

In addition, the rectangular steel pipe manufactured by roll forming is formed by forming a hot-rolled steel sheet into a cylindrical open pipe shape by roll forming, and the butt portion thereof is electro-welded, and then the cylinder is formed by rolls disposed up, down, left, and right. It is manufactured by applying a few percent drawing in the direction of the tube axis while maintaining the shape and then forming it into a square shape.

On the other hand, in the case of square steel pipes manufactured by cold press bending, work hardening due to bending deformation of the corner portion is significant, and the toughness and plastic deformation ability of the corner portion are damaged, so the seismic strength deteriorates. Each part becomes more prone to destruction. In particular, work hardening becomes significant in high-strength materials for building members containing hard secondary phases such as bainite.

Conventional prior art related to the manufacturing method of the existing square steel pipe includes a cylindrical shape, as disclosed in Korean Patent Publication No. 10-2021-135287, “Square steel pipe and its manufacturing method and building structure” (publication date: 2021.11.12) In the method of manufacturing a rectangular steel pipe in which rectangular shape-forming is performed after forming into a rectangular shape, the rectangular forming process is performed by forming adjacent side lengths in a cross section perpendicular to the pipe axis direction. Let H1 (mm) and H2 (mm) (H1≤H2), respectively, and when the intersection of straight lines drawn from the center positions of H1 and H2 toward the inside of the steel pipe is taken as the center of the square steel pipe, from the center position of H1 On a straight line drawn toward the inside of the steel pipe, a point offset by 1/2 (H2-H1) in the long side direction from the center of the square steel pipe is set as the offset point, and a straight line drawn from the offset point to the center of each part of the square steel pipe is the offset. It consists of a method of manufacturing a square steel pipe in which the central angle θ formed by a straight line drawn from a point toward the arc portion of each part or the flat portion of the square steel pipe satisfies the following equation (1).

Other prior art related to the existing rectangular steel pipe is as disclosed in Japanese Public Notice No. 03578584 "Manufacturing method of square steel pipe" (registration date: 2004.07.23), two places near the significant improvement in the width direction of the steel plate. is bent to a right angle and at the same time, two places on the inside of the right angle bend are bent to an obtuse angle, and then, in the shear forming device, the intermediate plate portion between the obtuse angle bends is placed on the outer shape of the vertical press device, and the intermediate By contacting the inner mold having the same width as the inner width of the flat plate portion with the inner surface of the intermediate flat plate portion, the left and right pressing device is applied to a pair of side flat portions connected to the intermediate flat plate portion in a state in which the intermediate flat portion is clamped by an upward and downward pressing device. By bringing a pair of push molds into contact with each other from the outside, these side flat plates are pressed on the inside to bend and mold the biobtuse angle bends close to a right angle. After transferring from the front end molding device to the back end molding device, the pair of side plate sections are molded to the inside. It is characterized in that the biobtuse angle bent part is formed into a right-angled bent part by pressing, and one butt part is formed by the left and right improved corresponding parts, and this butt part is welded.

However, in the existing manufacturing process of square steel pipes, welding work is performed after the final bending work is completed, and correction work using a press is performed to correct crown deformation of the square steel pipe that occurred after the welding work. Not only is there a risk of bending between pitches during correction work, but there is also a disadvantage that correction efficiency is not very high.

Korean Patent Publication No. 10-2021-135287 “Square steel pipe and manufacturing method thereof and building structure” (Publication date: 2021.11.12) Japanese Public Notice No. 03578584 “Manufacturing method of square steel pipe” (Registration date: 2004.07.23)

The present invention was created to solve the above-mentioned problems in consideration of the above-mentioned problems. The purpose is to easily correct the crown deformation of the square steel pipe by transmitting the pressing force of the hydraulic cylinder from the inner part of the square steel pipe to the outside, and to easily correct the crown deformation of the square steel pipe for correction work. The purpose is to provide a correction device for the inner part of a square steel pipe with an improved structure so as to reduce necessary space constraints.

Another object of the present invention is to adjust the coupling position with the inclined portion formed inclined at the end of the moving bar using the first, second, third, and square members corresponding to the shape of the inner corner of the square steel pipe, By controlling the pressing force transmitted from the inner part of the square steel pipe to the outside using the method of changing the spacing of 2, 3, and 4 square members, the crown of the square steel pipe is created by the pressing force that pushes the inner edge from the inner part of the square steel pipe in the diagonal direction. The aim is to provide a device for correcting the inner part of a square steel pipe with an improved structure so that deformation can be easily corrected.

The present invention for achieving the above object is a hydraulic cylinder mounted on the upper part of the base, a moving bar that is moved in the longitudinal direction forward and backward within the casing by the hydraulic cylinder, and a detachable combination around the outer circumference of the moving bar. and first, second, third, and quadrangular members each having first and second bent sides bent to correspond to one side and the other side constituting the inner edge of the square steel pipe, and forward and backward movement of the moving bar. The first, second, third, and square members are moved inward or outward depending on the direction, and when the first, second, third, and square members are moved in the outward direction, the inner edge of the square steel pipe is pressed to straighten the square steel pipe. It includes; a pressing means; wherein the pressing means is formed on the outer peripheral surface of an end of the moving bar with an inclined surface at an inclined angle such that the outer diameter width increases toward the end, and an inclined portion that moves forward and backward in conjunction with the movement of the moving bar. and an inner connection portion formed on the inside of the first, second, third, and square members, respectively, contacting the outer peripheral surface of the inclined portion, and forming a contact surface having an inclination angle corresponding to the inclination angle of the inclined portion, and extending from an end of the casing. A stopper member formed to be fixed and formed with a stopper hole that accommodates the inside of the first, second, third, and square members, respectively, to limit forward and backward movement of the first, second, third, and square members, and the It is composed of a fixing part that is coupled to fix the first, second, third and square members to the stopper member and prevent the third and square members from being separated from the stopper member in a downward direction, and the fixing part is located on the inner side of the stopper member. Flange portions formed at the front and rear ends of the connection portion, respectively, are accommodated in the stopper hole, one end is supported by the flange portion, and the other end is supported on the inside of a cover member that is detachably coupled to the stopper member, and is attached to the flange portion side. It is characterized by consisting of a spring member that provides elastic support to the stopper member, and a cover member that is fastened to the stopper member with a coupling bolt and prevents the spring member from being separated from the stopper ball.

The casing is coupled to surround the movable bar from the outside to support the forward and backward movements of the movable bar, and a bearing for supporting the movable bar is provided inside the casing.

The contact surface of the inner connection part has a height on one side greater than that on the other side.

On the surfaces where the flange portion of the fixing part and the cover member face each other, fixing protrusions inserted into the spring member are formed to prevent the spring member from being twisted during contraction and expansion operations.

The hydraulic cylinder is configured so that the cylinder block is supported on a support structure provided on the upper side of the base, and the height of the hydraulic cylinder is adjusted by a height adjustment means that adjusts the height of the cylinder block.

The height adjustment means includes left and right support plates formed in a vertical direction on the upper side of the base, an upper support plate that connects the upper parts of the left and right support plates and has an adjustment motor mounted on the upper side, and rotates by the rotational force of the adjustment motor. It consists of a gear part having a driven gear, and a screw shaft 620 that is interlocked with the lower side of the gear part and is screwed to the cylinder block to lift the cylinder block up and down according to the rotation direction of the control motor.

The present invention can move the spacing of the first, second, third, and square members in the inward and outward directions according to the moving direction of the moving bar linked to the movement of the hydraulic cylinder, and the first, second, and second members on the inner side of the square steel pipe. When the 3 or 4 square members are moved outward, the pressing force of the hydraulic cylinder is transmitted to the outside through the inner edge of the square steel pipe to correct the crown deformation of the square steel pipe, thereby correcting the crown deformation of the square steel pipe, so that the inner part of the square steel pipe is free from spatial restrictions during correction work. It has the useful advantage of improving the efficiency of correction work by being able to correct crown deformation of a square steel pipe that has been deformed outwardly.

In addition, the present invention has a shape corresponding to the inner corner portion of the inner portion of the square steel pipe and is provided with first, second, third, and fourth square members that are detachably coupled to the inclined portion formed at the end of the moving bar, so that the square steel pipe It has the advantage of being applicable regardless of the size and shape of the square steel pipe by providing 1st, 2nd, 3rd, and 4th rectangular members of various sizes corresponding to the size and shape.

In addition, the present invention can adjust the spacing of the first, second, third, and square members by sliding the first, second, third, and square members through the inclined surface of the inclined portion, so that the first, second, third, and square members By using a square member, the pressing force of the hydraulic cylinder can be easily transmitted from the inner side of the square steel pipe to the outer direction.

Figure 1 is a perspective view showing an embodiment of the device for straightening the inner part of a square steel pipe according to the present invention.
Figure 2 is an exploded perspective view of the stopper member and the first, second, third, and square members of the present invention.
Figure 3 is a perspective view showing the stopper member of the present invention and the first, second, third, and square members combined.
Figure 4 is a side view showing the casing of the present invention, the moving bar, and the height adjustment means.
Figures 5a and 5b show that the combined positions of the inclined portion of the present invention and the first, second, third, and quadrangular members are varied by the forward and backward movements of the moving bar, and the first, second, third, and fourth members according to the changed positions are shown in Figures 5a and 5b. A drawing showing the state before and after the change in the spacing of the square members.
Figures 6a and 6b are use states showing the states of the first, second, third, and square members and the inner corners of the square steel pipes before and after pressurization of the present invention.
Figure 7 is a perspective view showing another embodiment of the device for straightening the inner part of a square steel pipe according to the present invention.
Figure 8 is an exploded perspective view of the guide groove formed in the inclined portion of the present invention and the first, second, third, and quadrangular members.
Figure 9 is a combined state diagram of Figure 8.
Figure 10 is a front view showing the combined state of the connecting members and guide grooves of the first, second, third, and square members of the present invention.
Figures 11a and 11b show that the combined positions of the inclined portion and the first, second, third, and square members of another embodiment of the present invention are varied by the forward and backward movements of the moving bar, and the first, second, and fourth members according to the changed positions are shown in Figures 11a and 11b. A drawing showing the state before and after the change in the spacing of 3 and 4 square members.

In describing the present invention, if it is determined that specific descriptions of related known technologies or configurations may unnecessarily obscure the gist of the present invention, detailed descriptions thereof will be omitted. The terms described below are terms defined in consideration of functions in the present invention and may vary depending on the user's intention or custom. Therefore, the definition should be made based on the contents throughout this specification. In addition, 'including' a certain component does not mean excluding other components, but may include other components, unless specifically stated to the contrary.

One embodiment of the device for straightening the inner side of a square steel pipe according to the present invention will be described with reference to FIGS. 1 to 7, including a hydraulic cylinder 200 mounted on the upper part of the base 100, and a hydraulic cylinder 200 A moving bar 400 that moves in the longitudinal direction forward and backward within the casing 300, and one side that is detachably coupled to the outer circumference of the moving bar 400 and forms the inner edge of the square steel pipe 10. and the first, second, third, and square members (510, 520, 530, and 540) each having first and second bent sides (502, 504) bent to correspond to the other side, and the forward and backward moving directions of the moving bar (400). The first, second, third, and square members (510, 520, 530, and 540) are moved inward or outward, and when the first, second, third, and square members (510, 520, 530, and 540) are moved in the outward direction, the inner edge of the square steel pipe (10) is moved. It includes a pressurizing means for straightening the square steel pipe 10 by pressurizing it.

Referring to Figures 1 and 2, the base 100 is configured in the form of a bogie with wheels 110 installed at the bottom so that it can move in the forward and backward directions along a rail provided at the bottom of the ground.

The hydraulic cylinder 200 is mounted on the base 100 and performs the function of moving the moving bar 400 in the forward and backward directions by hydraulic pressure.

As shown in FIGS. 1 and 4, the casing 300 is arranged to be fixed to one side of the hydraulic cylinder 200 in a cantilever shape and is coupled to surround the moving bar 400 from the outside to form the moving bar ( 400) performs the function of supporting the forward and backward movements.

For this purpose, the casing 300 is provided with a bearing 310 inside to support the moving bar 400, as shown in FIG. 5A.

The first, second, third, and square members (510, 520, 530, and 540) have first and second bent edges (502, 504) formed on both sides, which are bent to correspond to the inner corners of the square steel pipe (10).

In addition, the first bent edge 502 of the first, second, third, and square members 510, 520, 530, and 540 is in contact with the inside of the horizontal surface of the square steel pipe 10, and the second bent edge 504 is in contact with the square steel pipe 10. It has a structure that contacts the inside of the vertical plane of (10).

The first, second, third, and square members (510, 520, 530, and 540) of an embodiment of the present invention are moved through the stopper hole 352 of the stopper member 350 on the inner side of the square steel pipe 10, as shown in FIG. 5A. As they are coupled to be seated on the inclined portion 450 formed at the end of the bar 400, the first, second, third, and square members 510, 520, 530, and 540 are interposed between the inclined portion 450 and the square steel pipe 10. combined as much as possible.

In addition, as shown in FIGS. 3 and 5B, the first, second, third, and square members (510, 520, 530, and 540) are restricted in forward and backward movement by the stopper member 350, so when the moving bar 400 moves backwards, The first, second, third, and square members (510, 520, 530, and 540) are located along the outer circumference close to the end side of the inclined portion 450, and when the moving bar 400 moves forward, as shown in FIG. 1, 2, 3, and 4 square members 510, 520, 530, and 540 are located along the outer circumference of the inclined portion 450 at a position spaced apart from the end side.

The pressing means is formed on the outer peripheral surface of the end of the moving bar 400 with an inclined surface at an inclined angle so that the outer diameter width increases toward the end, and an inclined portion 450 that moves forward and backward in conjunction with the movement of the moving bar 400. ) and a contact surface ( 505) is formed, the inner connection portion 506 is formed to extend from the end of the casing 300 and is fixed, and the first, second, third, and quadrangular members 510, 520, 530, and 540 are formed to limit forward and backward movement. A stopper member 350 in which a stopper hole 352 is formed to accommodate the insides of the 1st, 2nd, 3rd, and square members 510, 520, 530, and 540, respectively, and the first, 2, 3, and 4th square members 510, 520, 530, and 540, respectively. It consists of a fixing part 550 that is fixed to the stopper member 350 and coupled to prevent downward separation of the third and square members 530 and 540 with respect to the stopper member 350.

The inclined portion 450 is inserted into the stopper member 350 provided at the end of the casing 300, and is formed integrally with the end of the moving bar 400, so that it can be moved in the forward and backward directions by the hydraulic cylinder 200. It has a structure that moves to .

The inclined portion 450 is formed in a circular cross-sectional structure, extends from the end of the moving bar 400 to the front side, and has a tapered structure in which the outer diameter width becomes smaller from the front end to the rear side.

The stopper member 350 extends in a cylindrical structure at the end of the casing 300 and has a structure in which the inclined portion 450 is accommodated.

In addition, the stopper member 350 has a plurality of stopper holes 352 formed around the outer periphery through which the outside and the inside communicate.

The first, second, third, and square members (510, 520, 530, and 540) have a structure in which inner portions are in contact with the inclined portion (450) through the stopper hole (352).

In addition, the first, second, third, and square members (510, 520, 530, and 540) have an inclination angle corresponding to the inclination angle of the inclined portion 450 on one side of the inner connection portion 506 in contact with the outer peripheral surface of the inclined portion 450. A contact surface 505 is formed in which the height h2 of the other side is greater than the height h1 (h2>h1).

The inner connection portion 506 is detachably coupled to the first and second bent edges 502 and 504 of the first, second, third and square members 510, 520, 530 and 540 using fastening members such as bolts.

For this reason, the first and second bent edges 502 and 504 of the first, second, third and square members 510, 520, 530 and 540 are provided in various sizes and are connected to the inner connection portion 506 according to changes in the size of the square steel pipe 10. It can be replaced by attaching or detaching it.

In addition, as shown in FIGS. 2 and 3, the fixing part 550 is accommodated in flange parts 551 and 552 formed at the front and rear ends of the inner connection part 506, respectively, and the stopper hole 352. A spring whose one end is supported on the flange portions 551 and 552 and the other end is supported on the inside of the cover member 555 detachably coupled to the stopper member 350 to provide elastic support to the flange portions 551 and 552. It consists of a member 553 and a cover member 555 that is fastened to the stopper member 350 with a coupling bolt 557 and prevents the spring member 553 from being separated from the stopper hole 352.

The spring member 553 prevents the first, second, third, and square members (510, 520, 530, and 540) located on the upper and lower sides from being separated in the upward and downward directions, and also connects the contact surface of the inner connection portion 506 to the inclined portion. An elastic support force is provided to the inner connection portion 506 to ensure close contact with the outer peripheral surface.

In addition, the spring member 553 contracts when moving in the outward direction where the gap between the first, second, third, and square members (510, 520, 530, and 540) widens, When moving in the inner direction where the gap narrows, an extension operation is performed to return again.

On the surfaces of the cover member 555 and the flange portions 551 and 552 facing each other, there is a fixing protrusion 556 inserted into the spring member 553 to prevent the spring member 553 from being twisted during contraction and expansion operations. Each is formed.

The moving bar 400 is moved in the forward and backward directions within the casing 300 by the operation of the hydraulic cylinder 200, and the inclined portion 450 formed at the end of the moving bar 400 is a stopper member ( 350) moves back and forth within the space.

As shown in FIG. 1, the hydraulic cylinder 200 includes a cylinder block 210 supported on left and right support plates 120 and 130 and an upper support plate 140, which are support structures provided on the upper side of the base 100, It consists of a cylinder body 220 that protrudes to one side (front side) of the cylinder block 210 and supports the casing 300 to be fixed.

The cylinder block 210 has a structure in which the height adjustment means 600 moves up and down to adjust the central height of the hydraulic cylinder 200.

As shown in FIG. 4, the height adjustment means 600 connects the left and right support plates 120 and 130 formed in a vertical direction on the upper side of the base 100 and the upper parts of the left and right support plates 120 and 130, and The upper support plate 140 on which the control motor 610 is mounted, and the gear unit 615 having a gear rotated by the rotational force of the control motor 610, are interlocked with the lower side of the gear unit 615. It consists of a screw shaft 620 that is connected and screwed to the cylinder block 210 to elevate and lower the cylinder block 210 according to the rotation direction of the control motor 610.

In addition, the cylinder block 210 is installed on both left and right sides and is arranged to roll on the left and right support plates 120 and 130, and has a rolling wheel 215 that supports the up and down lifting movement of the cylinder block 210. It is further provided with

Since the height adjustment means 600 changes the center height according to the size change of the square steel pipe 10, the cylinder so that the center height of the moving bar 400 matches the center height of the square steel pipe 10. The height of the block 210 can be adjusted.

In one embodiment of the present invention having this structure, after the final bending process is completed and the welding work is completed, the rectangular steel pipe 10 is transferred in the longitudinal direction forward and backward to correct the deformation of the square steel pipe 10 generated during the bending process and welding work. By transmitting a pressing force from the inner side of the square steel pipe 10 to the outside, the deformation of the square steel pipe 10 is corrected.

The correction work of the square steel pipe 10 is to first place the base 100 close to the square steel pipe 10 and move the end of the moving bar 400 and the first, second, third, and square members 510, 520, 530, and 540. After being positioned on the inner side of the square steel pipe 10, the first, second, third, and square members 510, 520, 530, and 540 are moved outward using the pressing means.

The first, second, third, and square members (510, 520, 530, and 540) are in contact with the inner corners of the square steel pipe (10) and transfer the pressing force outward to the square steel pipe (10), thereby forming the deformed square steel pipe (10). It performs the function of correction from the inner part to the outer part.

At this time, an embodiment of the present invention moves the base 100 to a position close to the square steel pipe 10 so that the ends of the casing 300 and the moving bar 400 enter the inner part of the square steel pipe 10, When the hydraulic cylinder 200 is operated, the moving bar 400 moves rearward as shown in FIGS. 5B and 6B according to the movement of the hydraulic cylinder 200, and the first, second, third, and square Since the members 510, 520, 530, and 540 are located in fixed positions by the stopper member 350, the first, second, third, and square members (510, 520, 530, and 540) are positioned at the ends of the moving bar 400 as shown in FIGS. 5B and 6B. As the slope portion 450 formed in slides on the inclined surface, the gap between the first, second, third, and square members 510, 520, 530, and 540 widens in the outward direction and comes into contact with the inner edge of the square steel pipe 10, As the first, second, third, and square members (510, 520, 530, and 540) move outward and press the inner edge of the square steel pipe (10), the crown deformation of the square steel pipe (10), which is deformed to bend outward, is corrected. do.

At this time, the first, second, third, and square members (510, 520, 530, and 540) contract the spring member (553) as the gap widens outward.

On the other hand, when the moving bar 400 moves to the front side, as shown in FIGS. 5A and 6A, the first, second, third, and fourth squares located at fixed positions by the stopper member 350 The members 510, 520, 530, and 540 move inward while sliding along the slope of the inclined portion 450 and are separated from the inner edge of the square steel pipe 10, thereby releasing the straightening work of the square steel pipe 10.

In the above case, the contracted spring member 553, as described above, is extended to return again as the pressing force transmitted to the first, second, third, and square members (510, 520, 530, and 540) is released, and the extended spring member ( The contact surfaces 505 of the first, second, third, and square members 510, 520, 530, and 540 are in close contact with the outer peripheral surface of the inclined portion 450 due to the elastic support force of 553).

In addition, the third and quadrangular members 530 and 540 transmit the elastic support force of the spring member 553 to the flange portions 551 and 552 of the inner connection portion 506, thereby preventing downward departure from the stopper hole 352.

Another embodiment of the pressing means of the present invention, as shown in Figures 7 to 11b, the pressing means includes an inclined portion 450 formed at an inclined angle on the outer peripheral surface of the end of the moving bar 400, and the inclined portion A plurality of guide grooves 455 are formed to be spaced apart from each other along the circumference of the movable bar 450, move forward and backward in conjunction with the movement of the moving bar 400, and are concave in the forward and backward directions, and the plurality of guides. It is composed of a connecting member 560 that is slidably coupled to the groove 455 in the front and rear directions, respectively, and is detachably coupled to the inner portion of the first, second, third, and square members (510, 520, 530, and 540).

As shown in FIGS. 7, 8, and 9, the inclined portion 450 is formed at an inclined angle at the end of the moving bar 400 and has an octagonal cross-sectional structure, and is located at one of the sides of the octagon. They are formed to be spaced apart from each other, and guide grooves 455 in the form of rails are formed on the outer peripheral surface of the inclined portion 450 forward and backward in the longitudinal direction.

That is, the inclined portion 450 extends from the end of the moving bar 400 toward the front side and has a tapered structure in which the width of the outer diameter becomes smaller from the front end toward the rear side.

As shown in FIG. 10, the first, second, third, and square members (510, 520, 530, and 540) are slidably coupled to the guide groove 455 in the forward and backward directions, respectively, and the first, second, third, and A connecting member 560 that is detachably coupled to the square members 510, 520, 530, and 540 is formed on the inside.

The guide groove 455 is formed in a rail shape in the front and rear directions along the inclined circumferential surface of the inclined portion 450, and has a structure formed to open to the outside of the end of the inclined portion 450.

That is, as shown in FIGS. 8 and 9, the guide groove 455 is coupled to the fitting portions 565 of the first, second, third, and square members 510, 520, 530, and 540 so that they can slide. 455 functions to guide the movement of the coupling portion of the inclined portion 450 and the first, second, third, and square members 510, 520, 530, and 540 when the moving bar 400 moves forward and backward.

The outer portion of the connecting member 560 is detachably coupled to the inside of the first, second, third, and square members 510, 520, 530, and 540, and the inner portion is formed on the outside of the end of the inclined portion 450 through the guide groove ( It is slidingly coupled inside the guide groove 455 to enable entry into the inside of the guide groove 455.

In addition, as shown in FIG. 10, the connecting member 560 is formed inside the first, second, third, and square members (510, 520, 530, and 540), respectively, and is formed inside the first, second, third, and square members (510, 520, 530, and 540). The connector 562 is bent to correspond to the shape of the connector 562, and the outer surface is integrally formed to be connected to the inside of the connector 562, and enters the inner portion of the guide groove 455 to be slidably coupled to the connector 562. It is composed of an inclined fitting portion 565 to maintain the upper surface of the first, second, third, and square members (510, 520, 530, and 540) horizontal during the sliding movement of the first, second, third, and square members (510, 520, 530, and 540).

The fitting portion 565 is formed with a contact surface 505 having an inclination angle corresponding to the inclination angle of the inclined portion 450 at an inner portion that contacts the outer peripheral surface of the inclined portion 450.

Since the first, second, third, and square members (510, 520, 530, and 540) are detachably coupled to the guide groove 455 of the inclined portion 450 using the connecting member 560, the inner diameter size of the square steel pipe 10 And the first, second, third, and square members (510, 520, 530, and 540) of different dimensions corresponding to the corner edge shapes can be easily replaced.

Another embodiment of the pressing means of the present invention is as shown in Figure 11b, when the moving bar 400 is moved rearward within the casing 300 using the hydraulic cylinder 200, as shown in Figure 11b. , the first, second, third, and square members (510, 520, 530, and 540) slide along the inclined surface of the inclined portion 450 along the guide groove 455 of the inclined portion 450 formed at the end of the moving bar 400. The gap between the first, second, third, and square members (510, 520, 530, and 540) is formed on the outer side by the end of the inclined portion 450 having a relatively large outer diameter width. It spreads in this direction, and the first, second, third, and square members 510, 520, 530, and 540 contact the inner corners of the square steel pipe 10 and transmit pressing force to straighten the square steel pipe 10.

At this time, as each fitting portion 565 of the first, second, third, and square members 510, 520, 530, and 540 slides from the inside of the guide groove 455 to the outside of the end of the inclined portion 450, The spacing between the 1, 2, 3, and 4 square members (510, 520, 530, and 540) is widened so that the pressing force is transmitted from the inner side of the square steel pipe 10 to the outside to straighten the square steel pipe 10.

On the contrary, when the moving bar 400 is moved forward using the hydraulic cylinder 200, the first, second, third, and square members (510, 520, 530, and 540) are moved along the guide groove 455 to the inclined portion 450. ) is slid to the rear side along the slope, and as shown in Figure 11a, the gap between the first, second, third, and square members (510, 520, 530, and 540) that were apart from each other is narrowed, and from the inner edge of the square steel pipe (10) The first, second, third, and square members 510, 520, 530, and 540 are separated and the calibration work is released.

That is, in another embodiment of the pressing means of the present invention, the first, second, third, and square members (510, 520, 530, and 540) that slide on the inclined surface of the inclined portion (450) according to the movement direction of the moving bar (400) are spread or As the spacing of the first, second, third, and square members (510, 520, 530, and 540) changes while retracting, the hydraulic force of the hydraulic cylinder (200) is applied to the moving bar (400) and the first, second, third, and square members (510, 520, 530, and 540). It is transmitted from the inner part of the square steel pipe 10 to the outside through the process, so that crown deformation of the square steel pipe 10 can be corrected.

Meanwhile, the inner correction device of the square steel pipe 10 of the present invention may be used in parallel with the outer correction device for correcting deformation of the steel pipe on the outside of the square steel pipe 10.

Therefore, the present invention can move the spacing of the first, second, third, and square members (510, 520, 530, and 540) in the inward and outward directions according to the moving direction of the moving bar 400 linked to the movement of the hydraulic cylinder 200. , When the first, second, third, and square members 510, 520, 530, and 540 are moved outward from the inner part of the square steel pipe 10, the pressing force of the hydraulic cylinder 200 is applied in the outer direction through the inner edge of the square steel pipe 10. By transmitting and correcting the crown deformation of the square steel pipe (10), it is possible to correct the crown deformation of the square steel pipe (10) on the inner part of the square steel pipe (10) without spatial constraints during the correction work, thereby improving the efficiency of the correction work. It has useful advantages.

In addition, the present invention has a shape corresponding to the inner corner portion on the inner side of the square steel pipe 10 and is detachably coupled to the inclined portion 450 formed at the end of the moving bar 400. Since the square members (510, 520, 530, 540) are provided, the first, second, third, and square members (510, 520, 530, 540) corresponding to the size, dimension, and shape of the square steel pipe (10) are provided in various specifications to determine the size and shape of the square steel pipe (10). Regardless, it has applicable benefits.

In addition, the present invention relates to the first, second, third, and fourth rectangular members (510, 520, 530, 540) and the inclined portion (450) in a manner that the joining position of the inclined portion (450) is slidably moved through the inclined surface of the inclined portion (450). The spacing of the square members (510, 520, 530, and 540) can be adjusted, and an inclined contact surface 505 is formed on the inner portion of the first, second, third, and square members (510, 520, 530, and 540) that are in contact with the outer peripheral surface of the inclined portion 450. When the spacing of the 1st, 2nd, 3rd, and square members (510, 520, 530, and 540) is expanded and contracted, the upper surfaces of the 1st, 2nd, 3rd, and square members (510, 520, 530, and 540) can be maintained in a horizontal state. , The quadrangular members 510, 520, 530, and 540 are coupled to the inner corners of the square steel pipe 10 so as to make surface contact, so that the pressing force of the hydraulic cylinder 200 can be easily transmitted from the inner side of the square steel pipe 10 to the outside.

As such, in the detailed description of the present invention, specific embodiments have been described, but of course, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the claims and equivalents thereof as well as the claims described later.

In other words, the present invention described above is not limited to the specific preferred embodiments described above, and anyone skilled in the art to which the invention pertains can use it without departing from the gist of the present invention as claimed in the claims. Of course, various modifications and implementations are possible, and such modifications are within the scope of the claims.

10: square steel pipe 100: base
110: Wheel 120,130: Left and right support plates
140: upper support plate 200: hydraulic cylinder
210: cylinder block 215: rolling wheel
220: cylinder body 300: casing
310: Bearing 350: Stopper member
352: Stopper ball 400: Moving bar
450: Inclined portion 455: Guide groove
502: 1st bending edge 504: 2nd bending edge
505: contact surface 506: inner connection part
510,520,530,540: 1st, 2nd, 3rd, square members
550: Fixing part 551,552: Flange part
553: spring member 555: cover member
556: fixing protrusion 557: coupling bolt
560: Connecting member 562: Connector
565: Fitting portion 600: Height adjustment means
610: Control motor 615: Gear unit
620: screw axis

Claims (6)

A hydraulic cylinder 200 mounted on the upper part of the base 100,
A moving bar 400 moved in the longitudinal direction forward and backward within the casing 300 by the hydraulic cylinder 200,
First and second bent edges 502 and 504 are formed, respectively, which are detachably coupled around the outer circumference of the moving bar 400 and are bent to correspond to one side and the other side constituting the inner edge of the square steel pipe 10. 1st, 2nd, 3rd, and square members (510, 520, 530, 540), and
The first, second, third, and square members (510, 520, 530, and 540) are moved inward or outward according to the forward and backward movement directions of the moving bar (400), and the first, second, third, and square members (510, 520, 530, and 540) are moved inward or outward. ), pressurizing means for correcting the square steel pipe 10 by pressurizing the inner corner of the square steel pipe 10 when moving in the outward direction;
The pressing means is formed on the outer peripheral surface of the end of the moving bar 400 with an inclined surface at an inclined angle so that the outer diameter width increases toward the end, and an inclined portion 450 that moves forward and backward in conjunction with the movement of the moving bar 400. ) and a contact surface ( 505) is formed, the inner connection portion 506 is formed to extend from the end of the casing 300 and is fixed, and the first, second, third, and quadrangular members 510, 520, 530, and 540 are formed to limit forward and backward movement. A stopper member 350 in which a stopper hole 352 is formed to accommodate the insides of the 1st, 2nd, 3rd, and square members 510, 520, 530, and 540, respectively, and the first, 2, 3, and 4th square members 510, 520, 530, and 540, respectively. It consists of a fixing part 550 that is fixed to the stopper member 350 and coupled to prevent downward separation of the third and square members 530 and 540 with respect to the stopper member 350,
The fixing part 550 is accommodated in flange parts 551 and 552 formed at the front and rear ends of the inner connection part 506, respectively, and the stopper hole 352, and one end is supported by the flange parts 551 and 552. A spring member 553, the end of which is supported on the inside of the cover member 555 that is detachably coupled to the stopper member 350 and provides elastic support to the flange portions 551 and 552, and the stopper member 350. A correction device for the inner part of a square steel pipe, characterized in that it is fastened with a coupling bolt (557) and consists of a cover member (555) that prevents the spring member (553) from being separated from the stopper hole (352). In claim 1,
The casing 300 is coupled to surround the moving bar 400 from the outside to support the forward and backward movements of the moving bar 400,
A device for straightening the inner part of a square steel pipe, characterized in that a bearing 310 supporting the moving bar 400 is provided inside the casing 300. In claim 1,
The inner part straightening device of a rectangular steel pipe, characterized in that the contact surface 505 of the inner connection part 506 is formed with a height (h2) of the other side larger than the height (h1) of one side. In claim 1,
On the surface where the flange parts 551 and 552 of the fixing part 550 and the cover member 555 face each other, a insert is inserted inside the spring member 553 to prevent the spring member 553 from being twisted during contraction and expansion operations. A correction device for the inner part of a square steel pipe, characterized in that each fixing protrusion (556) is formed. In claim 1,
The hydraulic cylinder 200 has a cylinder block 210 supported on a support structure provided on the upper side of the base 100, and the hydraulic cylinder is adjusted by a height adjustment means 600 that adjusts the height of the cylinder block 210. (200) A correction device for the inner side of a square steel pipe, characterized in that the height is adjusted. In claim 5,
The height adjustment means 600 includes left and right support plates 120 and 130 formed in a vertical direction on the upper side of the base 100,
An upper support plate 140 that connects the upper parts of the left and right support plates 120 and 130 and has an adjustment motor 610 mounted on the upper side,
A gear unit 615 having a gear driven to rotate by the rotational force of the control motor 610, and
A screw shaft 620 connected to the lower side of the gear unit 615 and screwed to the cylinder block 210 to lift the cylinder block 210 up and down according to the rotation direction of the control motor 610. A correction device for the inner part of a square steel pipe, characterized in that it consists of.

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