KR20130103951A - Correctional equipment for straight line of spiral pipe - Google Patents

Abstract

PURPOSE: Apparatus for improving straightness of a spiral pipe is provided to automatically and quickly correct the straightness. CONSTITUTION: Apparatus for improving straightness of a spiral pipe comprises an input unit (10), a transfer unit, a first correcting unit (30), an entrance, a second correcting unit (50), and a loading unit (60). The input unit comprises a loading plate declined down and inputs spiral pipes into a transfer guide plate one by one. The transfer unit transfers the spiral pipes to the transfer guide plate. The first correcting unit corrects straightness of the spiral pipes. The entrance comprises a plurality of support rollers which receive the spiral pipes. The second correcting unit secondly corrects the straightness of the spiral pipes. The loading unit loads the corrected spiral pipes.

Description

Spiral pipe straightness straightening device {Correctional equipment for straight line of spiral pipe}

The present invention relates to a heat exchange pipe, that is, a straightening device for correcting straightness after forming a spiral pipe, and more particularly, when a spiral, that is, a spiral groove is formed in a predetermined portion of a general pipe, a portion in which a spiral groove is formed. Bending deformation between and other parts occurs. Especially, the spiral molded part is more severe, so that the spiral pipe can be automatically corrected according to the necessity to correct it. In addition, the diameter of the spiral molded part and other parts The present invention relates to a spiral pipe straightness straightening device that allows for straightness straightening even though there is a difference in diameter.

Generally, heat exchangers are equipped with spiral pipes. The spiral pipe has an internal passage through which the fluid can flow, and enables mutual heat exchange between the fluid passing through the inner passage and the surrounding fluid.

On the other hand, such a spiral pipe has a large surface area so that the heat exchange area with the surrounding fluid can be increased. As one example, a structure is known in which a spiral groove is formed on the outer surface of a spiral pipe to increase its surface area.

As a prior art for forming a spiral pipe as described above, the patent application No. 2008-0092187 of the invention 'fin tube manufacturing apparatus' has been previously filed and looking at the technical gist,

Claim 1

A chuck having a plurality of rolling dies for stamping grooves on the outer circumferential surface of the workpiece; A spindle for rotating the chuck such that the rolling dies can press the outer circumferential surface of the workpiece while rotating in the circumferential direction along the circumference of the workpiece; A transfer part for transferring the workpiece in one direction so that the rolling die can rotate in a spiral direction with respect to an outer circumferential surface of the workpiece; A drive pulley and a driven pulley installed at intervals and a chain for connecting the drive pulley and the driven pulley, and a driving motor for rotating the drive pulley at a constant speed so that the chain can be circulated at a constant speed. In the fin tube manufacturing apparatus comprising a; constant speed transfer means for maintaining a constant feed speed of the workpiece so that the spiral groove of the workpiece formed by the rolling die has a constant lead angle (Lead Angle) ,

The constant speed transfer means,

A catching pin movably installed in the conveying part so as to be caught by a portion of the chain and restrained or released;

And an actuator configured to move the locking pin in the direction of engagement with the chain such that the transfer unit is constrained to the chain to transfer the workpiece at a constant speed.

The precursor die,

The roller type rolling die is arranged to be inclined at an angle toward the conveying direction of the workpiece, and is aligned with the spiral direction of the helical groove to be formed in the workpiece. Tube manufacturing apparatus. "

As described above, a device for forming a spiral (spiral groove) within a predetermined range of a spiral pipe, that is, a pipe outer circumference, exists in the existing, but the straightness of the spiral pipe formed by the prior art as described above is a problem.

Although it is not a spiral pipe but a straightening device applied to a general metal pipe, a conventional straightening device for solving this problem is composed of a plurality of rollers installed, including a pair of variable rollers with adjustable intervals to induce the introduction of metal pipes. A guide portion, a horizontal straightening portion in which a plurality of rollers are arranged in a zigzag pattern on a horizontal plane around a traveling path of the metal pipe to correct bending on a horizontal plane of the metal pipe, and a plurality of rollers to correct bending on a vertical plane of the metal pipe The roller is composed of a vertical correction unit arranged in a zigzag on a vertical plane around the traveling path of the metal pipe and a drive device for interlocking the rollers.

In this conventional calibration apparatus, when the metal pipe to be calibrated is inserted between the rollers of the inlet, calibration is performed while the inserted metal pipe passes through the plurality of rollers, and the corrected metal pipe is discharged to the outside.

That is, in the related art, the worker has to input the metal pipes to be calibrated one by one as described above, and the metal pipes to be calibrated and discharged also have to be manually loaded, thereby reducing the work efficiency.

In addition, there is a problem that a safety accident may occur in the process of the metal pipe is added or discharged, the calibration by simply passing between a plurality of variable rollers is incomplete and thus also a problem that a lot of defective rate occurs.

The present invention has been made to solve the above-described problem, by the process of discharging at the step of inserting the spiral pipe of the calibration target in a batch process, as well as the prevention of the safety accidents resulting from the ease of the work process and the correction procedure It is an object of the present invention to provide a spiral pipe straightness correction device that can improve the safety and reliability of the product by significantly reducing the occurrence of the existing defect rate by enabling a plurality of implementations.

As a problem solving means of the present invention for achieving the above object,

"There is an entry loading plate provided to be inclined downward so that the spiral pipe to be calibrated to be rolled down by one's own weight, and to input the calibration target spiral pipe into the transfer guide plate one by one from the entry loading plate. A plurality of first pneumatic cylinders and first cylinder rods are provided on the lower side of the lower end of the entry loading plate, and the lifters for lifting and lowering the spiral pipes to be calibrated one by one to the transfer guide plate are arranged on top of the plurality of first cylinder rods. It is for conveying the input part provided with a plate and the spiral pipe to be calibrated on the conveying guide plate, and the second hydraulic rod is bent at the end of the second cylinder rod in the state where the second hydraulic cylinder is provided at the lower end thereof. Conveying part consisting of a bending bar provided with a chuck, conveyed by the conveying part The first straightening part for correcting the straightness of the spiral pipe to be calibrated to correct the input straightness of the spiral pipe to be inserted between the pair of variable rollers, the first straightening portion provided with a plurality of the variable rollers, A plurality of support rollers for conveying spiral pipes primarily calibrated by a straightening part are provided in a transverse direction, and a third cylinder rod of a third pneumatic cylinder is provided on both sides between the plurality of support rollers, and the third cylinder At the upper end of the rod, an entry portion provided with a first pushing plate and a straightness of the first-corrected spiral pipe entered from the entry portion are re-calibrated. A pair of rotary rollers are provided on both sides of the bottom and rotated. The upper roller is equipped with the auxiliary roller which is lifted by the auxiliary cylinder, and the main cylinder at the center A second bridge is provided with a pair of main rollers consisting of a plurality of lifting and lifting by a fourth cylinder rod of the fourth hydraulic cylinder between the auxiliary roller and the main roller and a second pushing plate at the upper end of the fourth cylinder rod Consisting of a government and a loading section for loading straightness-corrected spoiler pipes,

The conveying guide plate has a bent portion formed to prevent the spiral pipe from being deviated by being bent to one side end branched into a Y-shaped plate that is long in the longitudinal direction, and the other side is provided with a plurality of cutouts to allow the lifting plate to move up and down. And

The lifting plate is in the conveying guide plate direction, the first pushing plate is in the direction of the second straightening portion, the second pushing plate is formed in the upper surface inclined toward the loading portion, respectively,

The calibration target spiral pipe is pressurized between the pair of variable rollers to be corrected, and the arrangement of the pair of variable rollers is made of a plurality of alternating longitudinal and transverse directions sequentially,

According to the difference in diameter between the portion of the secondary roller and the spiral molded portion, the portion of the main roller to be corrected, the pressure correction strength of the main roller relatively stronger than that of the secondary roller. The above object can be achieved.

The inventors of the spiral pipe straightness correction apparatus according to the present invention having the configuration as described above, by treating the step of discharging at the step of inputting the spiral pipe of the calibration target in a batch process to prevent the safety accidents due to the simplicity of the work process Of course, by allowing a plurality of calibration procedures to be carried out, it is possible to improve the safety and reliability of the product by significantly reducing the occurrence of the existing defect rate, and to increase the work efficiency in a short time with a small number of people,

In particular, despite the difference in diameter between the spiral molded portion and other portions, it is possible to correct the straightness by differentiating to allow straightness correction.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

1 is a schematic overall perspective view of the inventors of the spiral pipe straightness correction device,
Figure 2 is an internal side view of the input portion is loaded spiral pipe for calibration in the spiral pipe straightness correction apparatus of the present invention,
3 is a view showing a state seated on the feed guide plate one by one of the spiral pipe to be corrected in the spiral pipe straightness correction apparatus of the present invention,
Figure 4 is an internal front view of the conveying unit showing the entire state in which the spiral pipe of the calibration target seated on the conveying guide plate in the spiral pipe straightness correction device of the present invention to the first straightening unit,
5 is an internal front view of the conveying unit showing a state in which the spiral pipe of the calibration target seated on the conveying guide plate in the spiral pipe straightness correcting apparatus of the present invention is transferred to the first straightening unit;
6 is a perspective view of main parts of a first straightening portion showing a state in which a spiral pipe of a calibration target transferred from a feed guide plate passes through a first straightening portion in a spiral pipe straightness straightening apparatus according to the present invention;
Figure 7 is an enlarged view of the main portion of the spiral pipe straightness straightening device of the present invention in the state that the spiral pipe to be passed through a pair of variable rollers in the state that the spiral pipe of the calibration target conveyed from the feed guide plate passes through the first straightening unit. ,
8 is a view illustrating a state in which a spiral pipe passing through the first straightening part is seated on the entry part in the spiral pipe straightness straightening device according to the present invention;
9 is a view showing a state in which the spiral pipe seated on the entry portion is transferred to the second straightening portion in the spiral pipe straightness straightening device of the present invention;
FIG. 10 is a view illustrating a state in which a spiral pipe is transferred to a second straightening part in the spiral pipe straightness correcting apparatus according to the present invention; FIG.
FIG. 11 is a view illustrating a state in which a secondary roller corrects a spiral pipe as the auxiliary cylinder descends while the spiral pipe is transferred to the second straightening unit in the spiral pipe straightness correction device according to the present invention. FIG.
12 is a spiral roller straightening device according to the present invention, as the auxiliary cylinder descends while the spiral pipe is transferred to the second straightening unit, the auxiliary roller corrects the spiral pipe as well as the main cylinder as the main cylinder descends. Shows a state of calibrating a spiral pipe,
FIG. 13 is a view showing a state for transferring a spiral pipe, in which a calibration is completed in a second straightening part, to a loading part in a spiral pipe straightness straightening device according to the present invention; FIG.
FIG. 14 is a view illustrating a state in which a spiral pipe, in which a straightening is completed, is transferred to a loading part in the spiral pipe straightness straightening device of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a schematic overall perspective view of the spiral pipe straightness correction device of the present invention, Figure 2 is an internal side view of the input portion is loaded spiral pipe for calibration in the spiral pipe straightness correction device of the present invention, Figure 3 is the present inventors In the spiral pipe straightness straightening device is a view showing a state seated on the feed guide plate one by one of the spiral pipe to be corrected, Figure 4 is a spiral pipe straightness straightening device of the present invention of the calibration target seated on the feed guide plate An inner front view of the conveying unit showing the entire state in which the spiral pipe is transferred to the first straightening unit, and FIG. 5 is a spiral pipe straightness straightening device of the present invention. 6 is a front elevation view of a conveying unit showing a state, and FIG. In this spiral pipe straightness correction device is a perspective view of the main portion of the first straight portion showing a state that the spiral pipe to be transferred from the conveying guide plate passes through the first straightening portion, Figure 7 is a spiral pipe straightness straightening device of the present invention Is an enlarged view of the main part of the spiral pipe to be passed to the pair of variable rollers of the spiral pipe of the calibration target conveyed from the feed guide plate passing the first calibration unit, Figure 8 is a spiral pipe straightness correction of the present invention In the apparatus, a spiral pipe passing through a first straightening part is shown in a state of being seated in an entrance part, and FIG. 9 is a spiral pipe straightness straightening device according to the present invention. 10 is a view showing a state, Figure 10 is a spiral pipe straightness straightening device of the present invention The spiral pipe is then transferred to the second straightening portion, Figure 11 is a spiral pipe straightness straightening device according to the present invention, the auxiliary roller is spiral as the auxiliary cylinder descends while the spiral pipe is transferred to the second straightening portion in the present invention 12 is a view illustrating a state of calibrating a pipe, and FIG. 12 illustrates a state in which a secondary roller straightens a spiral pipe as the auxiliary cylinder descends in a state in which a spiral pipe is transferred to a second straightening part in the spiral pipe straightness straightening device of the present invention. At the same time as the main cylinder descends the main roller is a view showing a state to calibrate the spiral pipe, Figure 13 is a spiral pipe straightness straightening device of the present invention to transfer the spiral pipe is completed in the second calibration section to the loading section 14 is a view showing a state for The inventors spiral pipe Jin is a view showing a state in which the second bridge correction is transferred to the load the spiral pipe is completed in the state in the straightness correction device.

The present invention is largely divided into the input unit 10, the transfer unit 20, the first correction unit 30, the entry unit 40, the second correction unit 50, the stacking unit 60, and each part as described above As a device that proceeds automatically and collectively,

The input unit 10 has an entry loading plate 100 formed to be inclined downward so as to be rolled down due to its own weight and the spiral pipe P to be calibrated is formed on one side thereof, and the calibration target in the entry loading plate 100 is formed. A plurality of first pneumatic cylinders 120 and first cylinder rods 121 are provided to feed spiral pipes P one by one into the feed guide plate 110 one by one under the lower end of the entry loading plate 100. Is provided and the elevating plate 111 for lifting and lowering the mounting guide spiral pipe (P) one by one to the transfer guide plate 110 one by one on the plurality of first cylinder rod 121 is provided.

Next, the transfer unit 20 is for transferring the calibration target spiral pipe (P) seated on the transfer guide plate 110, the second cylinder rod ( It is made of a bending bar 203, which is bent in two stages at the tip of 201 and the feed chuck 202 is provided at the end,

The conveying guide plate 110 is bent end 112 is bent to prevent the separation of the spiral pipe (P) to be corrected so that one end is branched into a long Y-shaped plate in the longitudinal direction and the other side is the win The plurality of cutouts 113 are provided so that the steel plate 111 can be elevated.

Next, the first straightening unit 30 is for correcting the straightness of the spiral pipe P to be calibrated by the transfer unit 20, and the spiral pipe P to be calibrated between the pair of variable rollers 300. In order to correct the input straightness as) is provided with a plurality of the pair of the variable roller 300,

The calibration target spiral pipe (P) between the pair of variable rollers 300 is to be corrected and the arrangement of the pair of variable rollers 300 is made of a plurality of alternating longitudinal and transverse directions sequentially.

Next, the entry part 40 is provided with a plurality of support rollers 400 which are transported in the horizontal direction, the plurality of support rollers to be conveyed spiral pipe (P) primarily corrected by the first correction unit 30 and the plurality of support rollers The third cylinder rod 411 of the third hydraulic cylinder 410 is provided on both sides between the 400 and the upper end of the third cylinder rod 411 is provided with a first pushing plate 412,

Next, the second straightening unit 50 is to re-calibrate the straightness of the first-corrected spiral pipe (P) entered from the entry portion 40 as a pair of rotary rollers 500 on both sides of the bottom surface. Is provided and the auxiliary roller 511 is elevated by the auxiliary cylinder 510 in the upper portion of the rotary roller 500 is provided in the center of the pair of main rollers 521 made of a plurality of elevated by the main cylinder 520 A fourth cylinder rod 531 of the fourth pneumatic cylinder 530 is provided between the auxiliary roller 511 and the main roller 521, and a second pusher is disposed at an upper end of the fourth cylinder rod 531. Plate 532 is provided.

Preferably, the pressure of the main roller 521 is greater than the pressure correcting strength of the auxiliary roller 511 according to the difference in diameter between the portion to be corrected by the auxiliary roller 511 and the spiral molded part to be the portion to be corrected by the main roller 521. The correction strength is relatively strong.

On the other hand, the elevating plate 111 in the direction of the conveying guide plate 110, the first pushing plate 412 in the direction of the second straightening unit 50, the second pushing plate 532 is the mounting portion ( The upper surface is formed to be inclined in the direction 60).

Next, the loading unit 60 is to load the spoiler pipe is straightness corrected.

Reference numeral H denotes a gap between the variable rollers 300 according to the distance between each variable roller 300 as a handle, that is, the diameter of the spiral pipe P to be calibrated.

Hereinafter, the operation of this embodiment will be described.

First, as shown in FIG. 1, the present invention automatically loads the calibration target spiral pipe P into the input unit 10 and automatically supplies power to the transfer unit 20 and the correction unit 30 in the input unit 10. ), The entry part 40, the second straightening part 50, the loading part 60 as a batch processing to proceed,

The specific working relationship is as follows.

First, as shown in FIG. 2, when the calibration target spiral pipe P is loaded on the entry stacking plate 100 of the input unit 10, the entry stacking plate 100 is inclined to roll down by its own weight. It is to be pushed automatically and sequentially toward the transfer guide plate 110 to be described.

That is, as shown in FIG. 3, the calibration target spiral pipe P loaded in the entry plate 100 is operated by the first cylinder rod 121 of the first pneumatic cylinder 120. The elevating plate 111 coupled to the upper end of the first cylinder rod 121 is lifted between the cutout portions 113 of the conveying guide plate 110 to transfer the spiral pipe P to be corrected in the 'Y' shape. The guide plate 110 is to be sent to the center goal point.

4 and 5, when the second cylinder rod 201 of the second pneumatic cylinder 200 is drawn out as shown in FIG. 5, the second cylinder rod 201 is coupled to the front end of the second cylinder rod 201. The bending bar 203 is moved forward so that the feed chuck 202 coupled to the front end of the bending bar 203 is seated at the central valley point of the 'Y' shaped transfer guide plate 110 The target spiral pipe P is transferred to the first straightening unit 30.

Next, the calibration target spiral pipe (P) transferred to the first straightening unit 30 as described above is primarily calibrated while passing between the pair of variable rollers 300 of both sides as shown in Figs. In order to compensate for the insufficiency of calibration when the pair of variable rollers 300 are formed only in the lateral or longitudinal direction, the present invention provides a plurality of the pairs of the variable rollers 300 in the horizontal direction and By alternately installing the longitudinal direction it is possible to compensate for the deviation of the spiral pipe (P) or other weakness of the pressure as it continues in the same direction.

Next, as shown in FIG. 8 and FIG. 9, the first straightened spiral pipe passed through the first straightening part 30 is seated on the supporting roller 400 formed in the lateral direction, which is the entry part 40. The first calibrated spiral pipe seated as described above is the first pushing plate 412 coupled to the upper end of the third cylinder rod 411 while the third cylinder rod 411 of the third hydraulic cylinder 410 is drawn out. ) Is automatically transferred to the second calibration unit 50.

Figures 8 and 9 illustrate this.

Next, the first calibrated spiral pipe which has passed through the entry part 40 as described above enters the second calibrator 50 as shown in FIGS. 10 to 12, and the first calibrated spiral pipe entered first. As shown in Figure 10 is to be seated between the pair of rotary rollers 500 by the first pushing plate 412. Of course, since the pair of rotary rollers 500 has a length of spiral pipe, a plurality of rotary rollers 500 are provided on both sides of the spiral pipe, so that the pair of rotary rollers 500 is provided at the lower end of the proper position based on the center of the spiral pipe.

The upper rollers of the pair of rotary rollers 500 are provided with auxiliary rollers 511 which are lifted by the auxiliary cylinders 510 on both sides of the center, respectively, and the main rollers 521 which are lifted by the main cylinders 520 at the center. ) Is provided but the main roller 521 is made of a pair as shown in FIG.

The second straightening unit 50 provided as described above is a state in which the secondary rollers 511 and the main rollers 521 are finally corrected for the first straight spiral pipe, and the auxiliary rollers 511 on both sides are leveled. And of course, the pair of rotary rollers 500 at the bottom is to rotate and in this state, the main roller 521 is to finally correct the straightness of the spiral portion.

In other words, the difference between the diameter of the portion to be corrected by the auxiliary roller 511 and the portion to be corrected by the main roller 521 is described in more detail. Differentiated strength between the main roller 521 and the main roller 521 by differentiating between the auxiliary roller 511 and the main roller 521 of the second calibration unit 50 to solve the problem that was impossible due to the existing consistent calibration strength. By eliminating this, even though there is a difference in diameter, the maximum straightness can be corrected.

13 and 14, the fourth cylinder rod 531 of the fourth pneumatic cylinder 530 is withdrawn and the first end of the fourth cylinder rod 531 is provided. 2 pushing plate 532 is to push the corrected spiral pipe to be transferred to the loading unit (60).

In this way, all processes from input to discharge are processed in one batch automatically, and unlike the existing technology, the first and second calibration units are automatically combined to allow quick and easy calibration, minimizing defect rate, and in time, economic and human resources. It is an improved technology with very high efficiency.

10: input part 20: transfer part
30: first calibration part 40: entry part
50: second calibration part 60: loading part
100: entry stack plate 110: transfer guide plate
111: elevating plate 112: bent portion
113: incision 120: the first hydraulic cylinder
121: first cylinder rod 200: second hydraulic cylinder
201: second cylinder rod 202: feed chuck
203: bending bar 300: a pair of variable roller
400: a plurality of support rollers 410: third hydraulic cylinder
411: third cylinder rod 412: first pushing plate
500: a pair of rotating roller 510: auxiliary cylinder
511: auxiliary roller 520: main cylinder
521: a pair of main roller 530: fourth hydraulic cylinder
531: fourth cylinder rod 532: second pushing plate
H: Handle P: Spiral pipe to be calibrated

Claims (5)

An entry loading plate 100 is formed to be inclined downward so as to be rolled down due to its own weight by being loaded with a calibration target spiral pipe P on one side thereof, and the calibration target spiral pipe P is formed on the entry loading plate 100 by 1. A plurality of first pneumatic cylinders 120 and first cylinder rods 121 are provided at a lower side of the lower end of the entry loading plate 100 so as to be inserted into the transfer guide plate 110 one by one. An input unit 10 having an elevating plate 111 for lifting and lowering the spiral pipe P to be moved to the transfer guide plate 110 one by one on the first cylinder rod 121;
In order to transfer the calibration target spiral pipe (P) seated on the transfer guide plate 110 in the second end of the second cylinder rod 201 in the state that the second hydraulic cylinder 200 is provided in the lower end of the Transfer portion 20 is formed of a bending bar 203 is bent and has a feed chuck 202 at the end,
It is for correcting the straightness of the straight pipe of the calibration target spiral pipe (P) conveyed by the transfer unit 20 as a correction for the straightness of the inserted spiral pipe (P) between a pair of variable roller (300). A first calibration unit 30 having a plurality of pairs of variable rollers 300,
A plurality of support rollers 400 for receiving the spiral pipe (P) primarily corrected by the first straightening unit 30 is provided in the transverse direction and on both sides between the plurality of support rollers 400 An entry portion 40 having a third cylinder rod 411 of the pneumatic cylinder 410 and an upper end of the third cylinder rod 411 having a first pushing plate 412;
The first straight calibrated spiral pipe (P) entered from the entry portion 40 for correcting the straightness again on both sides of the bottom is provided with a pair of rotary rollers 500 and the top of the rotary rollers 500 The auxiliary roller 511 which is lifted by the auxiliary cylinder 510 is provided in the center is provided with a pair of main rollers 521 which are lifted by the main cylinder 520 is provided with the auxiliary roller 511 and A second straightening part provided with a fourth cylinder rod 531 of the fourth hydraulic cylinder 530 between the main rollers 521 and a second pushing plate 532 at the upper end of the fourth cylinder rod 531. 50,
Spiral pipe straightness straightening device, characterized in that consisting of the loading portion (60) for loading the straightener corrected spoiler pipe.
The method of claim 1,
The conveying guide plate 110 is bent end 112 is bent to prevent the separation of the spiral pipe (P) to be corrected so that one end is branched into a long Y-shaped plate in the longitudinal direction and the other side is the win Spiral pipe straightness straightening device, characterized in that the plurality of cutouts 113 are provided so that the steel plate (111) can be elevated.
The method of claim 1,
The elevating plate 111 is in the direction of the transfer guide plate 110, the first pushing plate 412 is in the direction of the second straightening unit 50, the second pushing plate 532 is the stacking unit 60 Spiral pipe straightness correction device, characterized in that the upper surface is formed inclined in each direction.
The method of claim 1,
The calibration target spiral pipe (P) between the pair of variable rollers 300 is to be corrected and the arrangement of the pair of variable rollers 300 is characterized in that the longitudinal direction and the transverse direction alternately made of a plurality of Spiral pipe straightness corrector.
The method of claim 1,
The pressure correcting strength of the main roller 521 is greater than the pressure correcting strength of the auxiliary roller 511 according to the difference in diameter between the portion to be corrected by the auxiliary roller 511 and the spiral molding part to be corrected by the main roller 521. Spiral pipe straightness correction device, characterized in that the relatively hardened.

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