JP2017133059A - Cooling apparatus for steel pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize cooling in hardening process of a long steel pipe in which no distortion is provided on each of inner and outer surfaces on the steel pipe and the steel pipe is simultaneously cooled from inside and outside independently from a length of the steel pipe discharged from a hardening furnace.SOLUTION: It comprises a transporting apparatus 10 transporting a steel pipe P discharged from a hardening furnace H with skew rotation, an outer surface cooling apparatus 20 jetting outer surface cooling water onto outer surface of the steel pipe P during its transportation, an inner surface cooling apparatus 30 jetting inner surface cooling water onto inner surface of the steel pipe P, and a feeding/storing apparatus 40 which feeds the inner surface cooling apparatus 30 along axis direction of the steel pipe P into inner section of the steel pipe P and stores the steel pipe P at a length shortened along with axis direction. Arranged are a suspending apparatus 50 which suspends the inner surface cooling apparatus 30 from upper side, guides round trip movement of an inner surface cooling nozzle 35 which moves forward and back to an end part of the steel pipe P, a guide apparatus 60 which supports the inner surface cooling apparatus 30 from lower side and guides the inner surface cooling nozzle 35 to an end part of the steel pipe P, and an inner steel pipe support mechanism 70 supporting the inner surface cooling apparatus 30 at inner section of the steel pipe P.SELECTED DRAWING: Figure 1

Description

  The present invention mainly does not cause the cooling at the time of quenching the long steel pipe in each of the inner and outer surface portions of the steel pipe, and particularly the cooling water related to the cooling of the inner surface of the steel pipe regardless of the length of the steel pipe. The present invention relates to a cooling device for a steel pipe that can be uniformly supplied with cooling water from the inner and outer surfaces at the exit position of the quenching furnace when sequentially discharged from the quenching furnace, and is compactly configured.

  Conventionally, it is necessary to simultaneously cool the long steel pipe from the inner and outer surfaces when quenching the long steel pipe. That is, when cooling is performed only from the outer surface, a difference in cooling from the inner surface side occurs, so that the martensite ratio differs between the inner and outer surfaces depending on the material, and the hardness on the inner surface side is inferior. Conversely, when cooling only from the inner side, the hardness of the outer side is inferior, a cooling delay occurs depending on the longitudinal part, straightness cannot be obtained, and it is only necessary to correct after quenching and tempering In addition, a device for feeding a large flow rate and a large capacity of cooling water at a stretch is required for cooling.

  Therefore, for example, a cooling method for steel pipes in Patent Document 1 and Patent Document 2, a heat treatment system and a heat treatment method in Patent Document 3, and the like have been proposed. The cooling method of Patent Document 1 is to cool the inner and outer surfaces by using a plurality of annular outer surface cooling headers arranged in series in the moving direction of the steel pipe and a rod-shaped inner surface cooling header movable in the moving direction of the steel pipe inside the steel pipe. . The cooling method of Patent Document 2 cools the outer surface of the steel pipe rotating in the axial direction by the cooling water supplied from the outer surface cooling water supply nozzle, and uses the cooling water supplied from the inner surface cooling water supply nozzle to the end of the steel pipe. Assume that the inner surface is cooled. The system and method of Patent Document 3 includes a cooling device that cools a hollow cylindrical workpiece (steel pipe) from the outer peripheral surface side, a discharge-side injection device that discharges a cooling medium toward the cooling range of the inner peripheral surface of the workpiece, and a carry-in side. Suppose that it cools with an injection device.

JP 63-134633 A Japanese Patent No. 4045605 Republished Patent W2013-008831

  However, the cooling of the inner surface of the steel pipe according to Patent Document 1 requires that the header be formed in a bar shape that is at least longer than the length of the steel pipe because it is based on the rod-shaped inner surface cooling header. It must be a big device. The cooling of the inner surface of Patent Document 2 is a flow-down supply from an inner surface cooling water nozzle and is an inner lower portion that is sequentially positioned in the rotating steel pipe, so that the inner and outer surfaces of the steel pipe are uniformly cooled. Have difficulty. Since cooling of the inner surface of Patent Document 3 is based on an injection device configured in a rod shape from the carry-in side and the carry-out side of the steel pipe, it is necessary to provide standby spaces on the carry-in side and the carry-out side in the same manner as in Patent Document 1, which is a large scale. I have to be.

  In any case, the conventional method and apparatus for simultaneously cooling the inner and outer surfaces of a steel pipe can secure a predetermined hardness, but requires a straightening process for straightness or a large-scale apparatus that requires installation space. There was something to do.

  Therefore, the present invention was created in view of the conventional circumstances as described above, and by simultaneously cooling the steel pipe heated to the quenching temperature while being skew rotated from the inner and outer surfaces of the same cross section while being skew rotated, It is possible to ensure uniform hardness and straightness, and in particular, the inner surface cooling device that cools the inner surface of the steel pipe is extended to the inside of the steel pipe during cooling, and after cooling it is extracted from the inside of the steel pipe and reduced to reduce the equipment configuration. An object of the present invention is to provide a steel pipe cooling device that can be made compact.

In order to solve the above-described problems, in the present invention, the reference numerals in the embodiments for carrying out the invention to be described later will be added and described, and the shaft is rotated while skew-rotating the steel pipe P discharged from the quenching furnace H. A conveying device 10 for conveying along the direction, an outer surface cooling device 20 for supplying outer surface cooling water to the outer surface of the steel pipe P to be conveyed near the outlet of the quenching furnace H, and an outer surface cooling water for the inner surface of the steel pipe P. The inner surface cooling device 30 is disposed inside the steel pipe P so as to inject and supply the inner surface cooling water corresponding to the injection supply position, and is extracted from the cooled steel pipe P, and this inner surface cooling device 30 is used in the quenching furnace H. A payout storage device that extends along the axial direction of the steel pipe P to the outlet side, arranges it on the conveying device 10, and stores the inner surface cooling device 30 extracted from the steel pipe P by shortening the length along the axial direction of the steel pipe P. 40 To.
The inner surface cooling device 30 covers the steel pipe P as it is discharged and conveyed forward in the conveying direction, and sprays and supplies inner surface cooling water to cool the inner surface of the steel pipe P. An inner surface cooling nozzle 35 is provided at the tip, and when cooling, the outer surface cooling device 20 and the steel pipe P are substantially in the same position, and after cooling is completed, the steel pipe P is retreated from the inside along the conveying direction of the steel pipe P. Thus, it can be configured to go out of the steel pipe P.
The inner surface cooling device 30 includes an inner surface cooling water supply pipe 32 that communicates with an inner surface cooling water supply source pipe 31 that is connected to a cooling water supply source, and an inner surface cooling water that is directed toward the transfer direction of the steel pipe P. An inner surface cooling nozzle 35 connected to the tip of the inner surface cooling water supply pipe 32 so as to spray can be provided.
The inner surface cooling nozzle 35 is connected to the inner surface cooling water supply pipe 32 and has a nozzle main pipe 36 closed at the tip, and is rotatably connected to the outer circumference of the nozzle main pipe 36 so as to communicate with the nozzle main pipe 36. The jet pipe 37 is formed by opening a plurality of jet outlets 38 that are directed in the transport forward direction of the steel pipe P and directed rearward in the rotation direction of the jet pipe 37 itself. can do.
The feeding storage device 40 forms the inner surface cooling water supply source pipe 31 in the inner surface cooling device 30 as a flexible one in a wound shape, and the inner surface cooling water supply source tube 31 is formed with respect to the transport forward direction of the steel pipe P. By feeding out in the reverse direction, the inner surface cooling nozzle 35 is linearly extended so as to be positioned at the outlet of the quenching furnace H, and is retracted and retracted from the inside of the steel pipe P after the cooling is completed. Thus, it can be configured as a winding mechanism 41 for reducing and storing.
The winding mechanism 41 accommodates a spool 42 rotatably supported at a front portion of the conveying device 10 in the conveying direction of the steel pipe P and an inner surface cooling water supply source pipe 31 in the inner surface cooling device 30 and winds around the spool 42. The flexible storage cylinder 43 can be configured so as to be bent so as to be rotated.
The flexible storage cylinder 43 is a cylinder having a rectangular shape in cross section, and the first cylinder 44 having a one-side inclined edge 44A by cutting both ends into a triangle shape on the bent side, and a rectangular cross section in the same manner. The cylindrical body having a shape and both end portions formed in a mountain shape are alternately arranged adjacent to each other in a state where the end portions are overlapped with each other, with the second cylindrical body 45 being inclined on both sides 45A. The end portions can be swingably connected to each other.
The inner surface cooling device 30 is suspended from above by a suspension device 50, and the suspension device 50 includes a support beam 51 disposed at a position above the transportation device 10 along the transportation direction. And a suspension mechanism 55 that reciprocates by being supported by the lower surface of the support beam 51 and suspends the inner surface cooling device 30, and the support beam 51 has a front and rear end position of the transport device 10. The traveling belt 53 is looped between the movable rollers 52 that are pivotally supported by the shaft, and the suspension mechanism 55 can be fixed to the traveling belt 53.
The inner surface cooling device 30 is supported from below by a guide device 60, and the guide device 60 includes a plurality of guide columns 61 arranged along the conveying direction of the steel pipe P. The guide columns 61 are installed. A rectangular flexible storage cylinder 43 is placed and guided in a cross section in which the inner surface cooling water supply pipe 32 and the inner surface cooling water supply pipe 32 in the inner surface cooling device 30 are accommodated on the upper part of the lifting column machine 62 standing on the surface. A guide roller 63 can be provided.
In addition, a steel pipe support mechanism 70 that supports the inner surface cooling device 30 inside the steel pipe P is provided in the inner surface cooling device 30, and this steel pipe inner support mechanism 70 is provided with the inner surface cooling water supply pipe 32 in the inner surface cooling device 30. A mounting frame 71 mounted around the outer periphery and a free ball bearing 72 formed by embedding a ball rolling on the inner peripheral surface of the steel pipe P can be arranged on the outer periphery of the mounting frame 71. .

In the steel pipe cooling apparatus according to the present invention configured as described above, the steel pipe P discharged and transferred from the quenching furnace H is immediately exposed to the outer surface by the outer surface cooling apparatus 20 immediately after being discharged from the outlet of the quenching furnace H. However, the inner surface cooling device 30 simultaneously cools the inner surface of the inner surface by cooling water at substantially the same position, and cools the steel pipe P without causing distortion inside and outside.
The inner surface cooling device 30 that cools the inner surface of the steel pipe P waits at the exit of the quenching furnace H so as to be positioned inside the steel pipe P when the steel pipe P is discharged, and the discharged steel pipe P is this The ejection port 38 of the ejection pipe 37 that is moved so as to cover the inner surface cooling nozzle 35 in the inner surface cooling device 30 and rotates with respect to the nozzle main pipe 36 of the inner surface cooling nozzle 35 is directed to the transport forward direction of the steel pipe P and rotated. While cooling water is ejected toward the rear in the rotation direction, the entire inner surface of the steel pipe P is uniformly cooled.
Further, the feeding storage device 40 feeds the inner surface cooling device 30 and waits at the exit of the quenching furnace H, and when the steel pipe P is transported, the inner surface cooling device 30 is linearly extended inside the steel pipe P to be positioned and held. After the cooling is completed, the steel pipe P is wound up at a front position in the conveying direction, reduced, retracted from the inside of the steel pipe P, retracted and extracted, and the cooled steel pipe P is moved to the side of the conveying device 10, for example. Make it unloadable.
The take-up mechanism 41 of the feeding storage device 40 is configured such that the first cylinder 44 and the second cylinder 45 of the flexible storage cylinder 43 that stores the inner surface cooling water supply source pipe 31 in the inner surface cooling apparatus 30 are swingable. The inner surface cooling water supply source pipe 31 is wound around the spool 42 at the front portion of the conveying device 10 and the inner surface cooling device 30 is reduced in the length direction of the steel pipe P. Conversely, when unwinding, the inner surface cooling device 30 together with the suspension device 50 and the guide device 60 is extended linearly on the conveying device 10 to the outlet of the quenching furnace H, and the steel pipe from the quenching furnace H is expanded. Wait for P discharge.
In the suspension device 50, a suspension mechanism 55 that is supported by a support beam 51 disposed on the transport device 10 and reciprocates suspends the inner surface cooling nozzle 35 in the inner surface cooling device 30 from above, and the traveling belt 53. The inner surface cooling nozzle 35 is made to stand by at the outlet of the quenching furnace H by moving to the outlet side of the quenching furnace H by driving. Further, in the guide device 60, the guide roller 63 of the lifting column machine 62 in the raised position supports the inner surface cooling device 30 from below and guides the inner surface cooling nozzle 35 to the exit of the quenching furnace H.
The suspension mechanism 55 of the suspension device 50 when the steel pipe P is discharged and conveyed retracts and retracts in the conveyance advance direction by driving the traveling belt 53, and the lifting column machine 62 of the guide device 60 lowers the guide roller 63. It retracts to the position and does not hinder the forward movement of the steel pipe P.
The steel pipe support mechanism 70 maintains the position of the inner surface cooling nozzle 35 in the vicinity of the outlet of the quenching furnace H inside the steel pipe P that moves forward so as to cover the inner surface cooling nozzle 35 of the inner surface cooling device 30. For the rolling operation of the free ball bearing 72 that rolls on the inner peripheral surface, the inner surface cooling device 30 itself is held inside the steel pipe P, and the steel pipe P is sequentially moved while the inner surface cooling nozzle 35 is maintained at the axial center position of the steel pipe P. Move forward to.

  Since the present invention is configured as described above, the steel pipe P heated to the quenching temperature inside the quenching furnace H or the like while being skew rotated remains the same with the skew rotation discharged from the quenching furnace H. Cooling can be performed simultaneously from the inner and outer surfaces of the cross-sectional position by the outer surface cooling device 20 and the inner surface cooling device 30, and uniform hardness and straightness can be ensured. Moreover, in particular, the inner surface cooling device 30 for cooling the inner surface of the steel pipe P extends the inner surface cooling nozzle 35 along the conveying direction of the steel pipe P to the inside of the starting end at the time of discharge in the steel pipe P which is a cooling part by the feeding and storing device 40. Thus, the entire apparatus can be made compact because the length along the conveying direction is reduced and stored at the time of extraction after completion of cooling.

  That is, in the present invention, the conveying device 10 that conveys the steel pipe P while skew rotating, the outer surface cooling device 20 that injects and supplies the outer surface cooling water to the outer surface of the steel pipe P, and the outer surface cooling water injection supply to the inner surface of the steel pipe P. Correspondingly, the inner surface cooling device 30 for injecting and supplying inner surface cooling water, and the inner surface cooling device 30 for feeding and extracting the steel pipe P into the steel pipe P, extracting it and shortening it along the axial direction of the steel pipe P, and storing it. It is because it comprises. As a result, the entire apparatus can be made compact by simultaneous cooling at substantially the same position on the inner and outer surfaces of the steel pipe P and expansion / contraction of the inner surface cooling device 30.

  The inner surface cooling device 30 has an inner surface cooling nozzle 35 that covers the steel pipe P as it moves forward in the conveying direction, and the outer surface cooling device 20 and the steel pipe P are both inside and outside during cooling. The inner surface of the steel pipe P, which is almost in the same position and retreats from the inside of the steel pipe P after the end of cooling and goes out of the steel pipe P, is gradually discharged from the quenching furnace H and moves forward. The inner and outer surfaces of the steel pipe P can be simultaneously cooled at the same position together with the outer surface cooling water by the outer surface cooling device 20 with the inner surface cooling water, so that the internal and external distortion of the steel pipe P does not occur, the hardness is uniform, and the straightness can be maintained.

  The inner surface cooling nozzle 35 in the inner surface cooling device 30 is fitted and connected to the outer periphery of the nozzle main pipe 36 connected to the inner surface cooling water supply pipe 32 connected to the cooling water supply source. The ejection pipe 37 is made rotatable, and the ejection pipe 37 has a plurality of ejection openings 38 that are directed rearward in the conveyance forward direction of the steel pipe P and the rotation direction of the ejection pipe 37 itself. Since the ejection of the cooling water is directed to the front side in the conveying direction of the steel pipe P, the cooling water does not flow to the quenching furnace H side, and the periphery of the inner side surface of the steel pipe P is uniformly cooled by rotating.

  The feeding storage device 40 feeds the inner cooling water supply source pipe 31 which is flexible in a winding shape in the inner surface cooling device 30 in the direction opposite to the conveying forward direction of the steel pipe P, and causes the inner surface cooling device 30 to be on the rear end side of the steel pipe P. The inner surface cooling water supply source pipe 31 is provided as a winding mechanism 41 that extends linearly so as to be positioned inside and retracts and retracts when retracted and retracted from the inside of the steel pipe P after cooling. This portion can be stored by shortening the length along the conveying direction of the steel pipe P. Therefore, it can be set as a compact reduction | decrease structure in the accommodation standby position of the front site | part of the conveyance direction of the steel pipe P, and it is for cooling the inside of the steel pipe P in the front site | part along the conveyance direction of the steel pipe P like the past. It is not necessary to secure a standby space having a size in which the cooling mechanism is configured corresponding to the length of the steel pipe P.

  The winding mechanism 41 winds a flexible storage cylinder 43 that is formed to be able to bend and accommodate the inner surface cooling water supply source pipe 31 on a spool 42 that is rotatably supported. The inner surface cooling water supply source pipe 31 can be compactly wound and stored in a state where the inner surface cooling water supply source pipe 31 is protected from an external impact or the like.

  The flexible storage cylinder 43 has a rectangular cylinder shape in cross section, and the first cylinder body 44 whose both end portions are one-side inclined edges 44A on the bending side, and also has a rectangular cylinder shape in cross section, and both end portions are inclined on both sides. The second cylindrical body 45, which is the edge 45A, is placed adjacent to each other by overlapping each other at the ends, and the ends are connected to each other so as to be swingable. When smoothly wound and housed and rotated in the reverse direction, the inner surface cooling device 30 can be extended toward the side of the quenching furnace H.

  The suspension device 50 is provided with a suspension mechanism 55 that reciprocates along the conveyance direction by a support beam 51 on the conveyance device 10 and suspends the inner surface cooling device 30. The inner surface cooling device 30 is suspended and positioned near the exit of the quenching furnace H so that it can stand by for cooling the steel pipe P discharged from the quenching furnace H. After the positioning, when the steel pipe P to be discharged moves so as to cover the inner surface cooling nozzle 35 of the inner surface cooling device 30, the suspension mechanism 55 moves backward so that the movement of the steel pipe P is not hindered and the movement ends. By waiting at the front position of the front end of P and suspending the portion of the inner surface cooling water supply source pipe 31 in the inner surface cooling device 30, it is possible to support the load of the inner surface cooling device 30 that retreats and retreats after the end of cooling. .

  The guide device 60 is a flexible storage in which the inner surface cooling water supply pipe 32 and the inner surface cooling water supply source pipe 31 of the inner surface cooling device 30 are accommodated in the upper part of the lifting column machine 62 so as to support the inner surface cooling device 30 from below. By comprising a plurality of guide struts 61 provided with guide rollers 63 for placing and guiding the cylinder 43, it is drawn out from the payout storage device 40 and extended to the vicinity of the exit of the quenching furnace H at the ascending position of the lifting column machine 62. The inner surface cooling device 30 can be supported from below. In addition, at the lowered position of the lifting column machine 62, the movement of the steel pipe P discharged from the quenching furnace H is not hindered and does not get in the way.

  Further, the inner surface cooling device 30 is provided with a steel pipe support mechanism 70 that supports the inner surface cooling device 30 inside the steel pipe P. The inner steel pipe support mechanism 70 is an inner surface cooling water supply pipe of the inner surface cooling device 30. A free ball bearing 72 in which balls that roll on the inner peripheral surface of the steel pipe P are embedded is disposed on the outer periphery of the mounting frame 71 mounted on the steel pipe P, so that the steel pipe P covers the inner surface cooling nozzle 35. When moving forward while being covered, the inner surface cooling nozzle 35 of the inner surface cooling device 30 can be maintained at the axial center position inside the steel pipe P. In addition, the inner circumferential surface of the steel pipe P is not only uniformly cooled by being maintained at the axial center position, but the inner surface cooling nozzle 35 is located in the vicinity of the exit of the quenching furnace H, along with the outer surface cooling device 20 inside and outside the steel pipe P. It also helps to smoothly move the steel pipe P toward the transport forward direction while maintaining the same position.

  In addition, the code | symbol attached | subjected in each means of the means for solving said subject and the effect of invention was attached | subjected in order to make easy reference with the part which shows each structure part described in drawing. The present invention is not limited to these descriptions, structures, shapes, and the like indicated by reference numerals and the like in the drawings.

It is a side view which shows one form for implementing this invention. It is the same top view. It is a principal part plane sectional view when cooling sequentially from the start end of the steel pipe discharged from a quenching furnace. It is a side view after completion | finish of cooling of a steel pipe similarly. It is the same top view. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. Similarly, the inner surface cooling device is shown, (A) is a side view of the main part, (B) is a sectional view taken along line BB in (A). Similarly, the drawing storage device is shown, (A) is a side view of the main part, (B) is a cross-sectional view of the joint part, (C) is a cross-sectional view taken along the line CC in (B). Similarly, the steel pipe support mechanism is shown, in which (A) is a side view and (B) is a cross-sectional view along the line DD in (A).

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. A steel pipe cooling device according to the present invention is along an axial direction while skew-rotating a steel pipe P discharged from a quenching furnace H. Conveying device 10 for conveying, outer surface cooling device 20 for injecting and supplying outer surface cooling water to the outer surface of steel pipe P being conveyed, inner surface cooling device 30 for injecting and supplying inner surface cooling water to the inner surface of steel pipe P, and this inner surface cooling device 30 The steel pipe P is provided with a pay-out storage device 40 that extends along the axial direction of the steel pipe P and stores the steel pipe P by shortening the length along the axial direction of the steel pipe P. A suspension device that suspends the inner surface cooling device 30 from above, guides the reciprocation of an inner surface cooling nozzle 35 (described later) that moves forward and moves back to the end of the steel pipe P discharged from the quenching furnace H. 50, the inner surface cooling device 30 is supported from below, and similarly, the guide device 60 for guiding the inner surface cooling nozzle 35 to the end of the steel pipe P discharged from the quenching furnace H, and the inner surface cooling device 30 are supported inside the steel pipe P. A steel pipe support mechanism 70 is provided.

  As shown in FIGS. 1, 2, 4, and 5, the conveying device 10 is configured to discharge a steel pipe P that is heated and discharged from the inside of the quenching furnace H at a predetermined temperature, which is the axial direction of the steel pipe P. Conveys while rotating along the skew. The transport device 10 is composed of a plurality of spindle-shaped transport rollers 11 which are inclined at a predetermined angle with respect to the transport direction and arranged at appropriate intervals on the transport surface, and the steel pipe P is positioned in the recess of the transport roller 11. The steel pipe P is conveyed in the axial direction while giving a skew rotation along the circumferential direction to the steel pipe P by supporting and rotating in the conveying direction.

  The conveying surface is inclined so that the front side in the conveying direction of the steel pipe P is slightly lower than the rear side, that is, the outlet side of the quenching furnace H. For example, the inclination angle is set to about 5 degrees. Yes. By doing so, the outflow of the cooling water injected and supplied to the steel pipe P to the quenching furnace H side is also prevented.

  In addition, a stock yard 15 in which a plurality of support bar bases are arranged in parallel is provided on the side of the conveying device 10, and after the cooling of the steel pipe P, the steel pipe P is moved from the conveying device 10 to, for example, a pusher ( (Not shown) is moved to the stock yard 15.

  The outer surface cooling device 20 is disposed in the vicinity of the exit of the quenching furnace H as shown in FIGS. 1 to 5, and the outer surface cooling water is injected and supplied in conjunction with the inner surface cooling water injection supply operation in the inner surface cooling device 30. To be. As shown in FIG. 6, the outer surface cooling device 20 communicates with a cooling water supply pipe 21 connected to a predetermined cooling water supply source (not shown), and the outer periphery of the steel pipe P is spaced at a predetermined interval. A ring-shaped supply part 22 formed so as to surround, and a plurality of outer surface cooling nozzles 23 arranged inside the supply part 22 so as to inject the outer surface cooling water toward the side toward which the steel pipe P is conveyed. Become.

  In addition, the supply part 22 is not restricted to the case where it arrange | positions by 3 sets along the conveyance direction of the steel pipe P as it is in the example of a figure, but can be comprised by 1 set or multiple sets. Moreover, although the outer surface cooling nozzles 23 are arranged in a total of eight along the inner peripheral side surface of the supply unit 22 at equal intervals, the present invention is not limited to this.

  On the other hand, as shown in FIGS. 1 and 2, the inner surface cooling device 30 is covered with the steel pipe P as the start end of the steel pipe P discharged and conveyed moves forward in the conveying direction. When the steel pipe P sequentially enters the inside of the steel pipe P, the inner surface cooling water is sequentially jetted and supplied to the moving portion according to the movement of the inner surface of the steel pipe P to be conveyed. The inner surface cooling nozzle 35 at the front end for supplying and supplying inner surface cooling water to cool the inner surface of the steel pipe P is substantially in the same position inside and outside the outer surface cooling device 20 and the steel pipe P during cooling, and the steel pipe after cooling is finished. The steel pipe P is retracted from the inside of the steel pipe P along the conveying direction of the steel pipe P so as to go out from the outside of the starting end of the steel pipe P.

  The inner surface cooling device 30 itself is connected to a predetermined cooling water supply source and communicates with an inner surface cooling water supply source pipe 31 formed as a flexible one as will be described later. 32 and an inner surface cooling nozzle 35 connected to the tip of the inner surface cooling water supply pipe 32 so as to inject the inner surface cooling water toward the transfer direction of the steel pipe P. The cooling water supply source and the inner surface Cooling water can be supplied to the cooling nozzle 35 by the inner surface cooling water supply source pipe 31 and the inner surface cooling water supply pipe 32 or by a cooling water pipe that is internally piped therein.

  As shown in FIG. 7, the inner surface cooling nozzle 35 shown in the figure is connected to the inner surface cooling water supply pipe 32 and the nozzle main pipe 36 closed at the tip, and is rotatable on the outer periphery of the nozzle main pipe 36. The nozzle pipe 36 is formed in a double-pipe structure from the jet pipe 37 communicated with the main pipe 36. The jet pipe 37 is directed in the forward direction of conveyance of the steel pipe P, and the rotation direction of the jet pipe 37 itself. A plurality of spouts 38 directed rearward are opened. The ejection port 38 is inclined slightly outward with respect to the conveying direction of the steel pipe P and outward with respect to the normal direction of the ejection pipe 37. By carrying out like this, the inner peripheral surface of the steel pipe P can be uniformly and uniformly jet-cooled toward the conveyance advance direction of the steel pipe P while rotating the jet pipe 37 by the jetting action accompanying the supply water pressure of the supplied inner surface cooling water.

  Further, as shown in FIGS. 1, 2, 4, and 5, the feeding storage device 40 illustrated does not cool the steel pipe P with the inner surface cooling device 30 that extends and moves along the axial direction of the steel pipe P. During standby, the length along the axial direction of the steel pipe P is shortened and housed in a reduced size, and during cooling, the inner surface cooling device 30 is extended so that the inner surface cooling nozzle 35 is positioned so as to enter the inside of the steel pipe P. Therefore, it is forcibly rotated by a drive source 47 described later.

  In the drawing storage device 40 in the illustrated example, the inner surface cooling water supply source pipe 31 in the inner surface cooling device 30 is formed to be flexible in a wound shape, and the inner surface cooling water supply source pipe 31 is formed as a steel pipe. The inner surface cooling device 30 itself is extended linearly so as to be arranged on the conveying device 10 by being fed in a direction opposite to the conveyance forward direction of P, and the inner surface cooling nozzle 35 is positioned in the vicinity of the exit of the quenching furnace H. When the steel pipe P is retracted and retracted from the inside of the steel pipe P after cooling is completed, the winding mechanism 41 is configured to be retracted and retracted. Further, the inner surface cooling water supply pipe 32 is formed such that a plurality of supply pipe materials whose diameters are sequentially reduced in diameter can be accommodated in the supply pipe material on the large diameter side in order to be extendable and contractible. The mechanism 46 is configured. Although not shown in the drawings, the entire inner surface cooling water supply source pipe 31 and inner surface cooling water supply pipe 32 may be configured to be flexible so that they can be wound, or may be contractible or expandable. It is also possible to configure as.

  The winding mechanism 41 includes a spool 42 that is rotatably supported along the conveyance direction at a front portion of the conveyance surface of the conveyance device 10 in the conveyance direction of the steel pipe P, and an inner surface cooling water supply source pipe 31 in the inner surface cooling device 30. And a flexible storage cylinder 43 formed so as to be bent so as to be wound around the spool 42. The spool 42 is supported so as to be rotationally controlled by a driving source 47 such as a motor by an appropriate bearing (not shown) arranged and configured at an upper portion of the conveying surface, for example, and formed on the central axis thereof. The inner surface cooling water supply source pipe 31 is connected to the cooling water supply section.

  As shown in FIG. 8, the flexible storage cylinder 43 is, for example, a cylinder having a rectangular shape in cross section, and a first cylinder whose both end portions are cut into a triangular shape on the bending side to form a one-side inclined edge 44 </ b> A. 44, a second cylindrical body 45 having a rectangular shape in cross section, slightly smaller than the first cylindrical body 44, and having both side inclined edges 45A by forming both ends in a mountain shape. Are arranged adjacent to each other in a state where the second cylinder 45 is fitted inside the first cylinder 44 and the ends are overlapped with each other, and the ends are swingable by, for example, screwing 43A. It is connected to. The rear end of the flexible storage cylinder 43 is fixed to the spool 42, and the front end is connected to the rear end side of the inner surface cooling water supply pipe 32. By doing so, the inner surface cooling water supply source pipe 31 can be wound around the spool 42 itself along the outer periphery of the spool 42 in a state in which the inner surface cooling water supply source pipe 31 is housed inside. Can be stored with a shorter length.

  On the other hand, the expansion / contraction mechanism 46 is configured so that the inner surface cooling water supply pipe 32 itself can be extended and contracted, and the rear end of the inner surface cooling water supply pipe 32 is connected to the front end of the inner surface cooling water supply source pipe 31 in a watertight manner. In addition, the plurality of supply pipe members connected in a large and small diameter in the expansion / contraction mechanism 46 are also connected in a watertight manner.

  Further, the inner surface cooling device 30 is suspended from above, and the inner surface cooling nozzle 35 is positioned in the vicinity of the exit of the quenching furnace H, that is, the moving start end portion of the steel pipe P discharged from the quenching furnace H. Is supported by the lower surface of the supporting beam 51 disposed in the conveying direction at a position above the conveying surface in the conveying device 10 and reciprocatingly moved by the inner surface cooling device 30. And a suspension mechanism 55 for suspension. A travel belt 53 is looped around the support beam 51 between, for example, moving rollers 52 that are pivotally supported at the front and rear end positions of the transport surface, and a suspension mechanism 55 is fixed to the travel belt 53 so that the travel belt 53 is fixed. The suspension mechanism 55 is reciprocated by the forward / reverse rotation 53.

  The traveling belt 53 is provided with a tension mechanism 54, and the inner surface cooling device 30 is moved at substantially the same height position so that the vertical movement when the suspension mechanism 55 reciprocates does not occur. I am doing so.

  The suspension mechanism 55 includes a suspension portion 57 that suspends the inner surface cooling device 30 by inserting the inner surface cooling device 30 into a lower portion of an elevating actuator 56 such as a cylinder having a fixing portion to the traveling belt 53 at an upper portion. It is provided. The suspension portion 57 itself is, for example, configured to allow the rectangular flexible storage cylinder 43 to be inserted in a cross-section containing the inner surface cooling water supply pipe 32 and the inner surface cooling water supply pipe 32 in the inner surface cooling device 30. It is formed in a rectangular frame shape. Further, the suspending portion 57 may have an open / close type chuck structure, for example, in order to prevent interference with a steel pipe support mechanism 70 described later.

  When the steel pipe P is discharged from the quenching furnace H, the suspension apparatus 50 moves the inner surface cooling nozzle 35 of the inner surface cooling apparatus 30 that moves forward to a position near the outlet of the quenching furnace H and is waiting for cooling. The suspension mechanism 55 moves forward so as to be suspended in the vicinity of the exit of the furnace H. As the end of the steel pipe P moves forward in the transport direction by moving and transporting the steel pipe P, or before the movement, the suspension mechanism 55 is sequentially moved backward so that the entire steel pipe P is removed from the quenching furnace H. When the cooling is finished, the apparatus waits at the front position of the front end in the conveying direction of the steel pipe P.

  Further, the guide device 60 that supports the inner surface cooling device 30 from below and guides the inner surface cooling nozzle 35 of the inner surface cooling device 30 to a position near the exit of the quenching furnace H is provided below the conveying surface. This guide device 60 comprises a group of a plurality of, for example, three guide columns 61 arranged along the transport direction of the steel pipe P on the installation surface below the transport surface in the transport device 10 as shown in the figure. The support 61 has a rectangular flexible cross section in which the inner surface cooling water supply pipe 32 and the inner surface cooling water supply pipe 32 in the inner surface cooling device 30 are accommodated in the upper part of an elevating support device 62 such as a cylinder standing on the installation surface. A guide roller 63 for placing and guiding the storage cylinder 43 is provided.

  When the inner surface cooling nozzle 35 in the inner surface cooling device 30 moves to the vicinity of the exit of the quenching furnace H, the elevating column machine 62 has an inner surface cooling nozzle 35 and further an inner surface cooling water supply pipe 32 at a position where the guide roller 63 is raised. The inner surface cooling water supply source pipe 31 is guided to the exit side of the quenching furnace H. When the steel pipe P is discharged from the exit of the quenching furnace H, the elevating column machine 62 positioned at the front in the conveying direction is at least sequentially lowered and retracted to the lower position of the steel pipe P which is the conveying surface. I have to. It is also possible to support and guide the steel pipe P from below by the guide roller 63 when it is lowered to this lower position.

  Further, the inner surface cooling nozzle 35 in the inner surface cooling device 30 waiting at the exit of the quenching furnace H is moved to the inside of the steel pipe P, so to speak, as the steel pipe P to be discharged and conveyed moves forward in the conveying direction. When it enters, the inner surface cooling device 30 is provided with a steel pipe support mechanism 70 that supports the inner surface cooling device 30 inside the steel pipe P. The steel pipe internal support mechanism 70 rolls on the inner peripheral surface of the steel pipe P and the mounting frame 71 that is mounted to surround the outer periphery of the inner surface cooling water supply pipe 32 in the inner surface cooling device 30 as shown in FIG. Free ball bearings 72 in which balls are embedded are arranged on the outer periphery of the mounting frame 71, for example, at four intervals of 90 degrees.

  A plurality of the steel pipe support mechanisms 70 are mainly arranged at appropriate intervals in the inner cooling water supply pipe 32 portion of the inner cooling device 30, and are also arranged at the tip of the inner cooling nozzle 35. Considering that the inner surface cooling nozzle 35 is positioned on the central axis of the steel pipe P, the entire inner periphery of the steel pipe P can be uniformly cooled in combination with the rotation of the inner surface cooling nozzle 35 itself.

  Next, an example of the use thereof will be described. When the predetermined steel pipe P after the quenching process is discharged from the quenching furnace H, it is transported together with the outer surface cooling device 20 disposed in the vicinity of the exit of the quenching furnace H. The inner surface cooling nozzle 35 is fed by the feeding and storing device 40 so that the inner surface cooling device 30 is disposed on the conveying surface of the apparatus 10, suspended by the suspension device 50, and guided by the guide device 60. It is brought near the exit of H and located. By doing so, in the vicinity of the exit of the quenching furnace H, the inner surface cooling nozzle 35 stands by together with the outer surface cooling device 20 corresponding to the end position at the starting end of the steel pipe P to be discharged.

  When the steel pipe P is discharged from the quenching furnace H, it is sequentially conveyed forward in the conveying direction while being skew-rotated by the conveying device 10. Then, the discharge conveyance of the steel pipe P is moved so that the inner surface cooling nozzle 35 is taken into the steel pipe P. The outer surface cooling device 20 uses the outer surface cooling water, and the inner surface cooling device 30 uses the inner surface cooling water. The steel pipe P is spray-supplied toward the forward direction of conveyance of the steel pipe P at substantially the same position on the inner and outer surfaces, and the discharge portion of the steel pipe P discharged from the quenching furnace H in response to the forward movement of the steel pipe P sequentially on the inner and outer surfaces Cool down. At this time, the inner surface cooling nozzle 35 is positioned on the central axis of the steel pipe P by the steel pipe inner support mechanism 70, and the inner peripheral surface of the steel pipe P is cooled substantially uniformly with the rotation of the inner surface cooling nozzle 35 itself. As the steel pipe P is discharged and transported, the suspension device 50 moves the suspension portion 57 to the front side in the transport direction, and the guide device 60 is lowered so as not to interfere with the transport of the steel pipe P.

  When the entire steel pipe P is discharged from the quenching furnace H, the cooling of the entire inner and outer surfaces of the steel pipe P is almost finished, and after the cooling is finished, the cooling water jet supply in each of the outer surface cooling device 20 and the inner surface cooling device 30 To stop. After the cooling is completed, the feeding and storage device 40 is operated to wind the portion of the inner surface cooling water supply source pipe 31 in the inner surface cooling device 30 around the spool 42 together with the bending of the flexible storage tube 43, and the inner surface cooling water. The portion of the supply pipe 32 is reduced, the inner surface cooling nozzle 35 is pulled out from the inside of the steel pipe P, and the apparatus waits to cool the next steel pipe P.

  The steel pipe P, whose inner and outer surfaces have been cooled, is carried out from the conveying device 10 to the side stock yard 15 as it is conveyed while being skew rotated by the conveying device 10. After the steel pipe P is carried out, the inner surface cooling device 30 is sent to the exit side of the quenching furnace H by the feeding operation of the feeding and storing device 40, and the inner surface cooling nozzle of the inner surface cooling device 30 suspended by the suspension device 50. 35 is positioned in the vicinity of the exit of the quenching furnace H together with the guidance by the guide device 60 to prepare cooling of the next steel pipe P discharged from the quenching furnace H.

H ... quenching furnace P ... steel pipe 10 ... transfer device 11 ... transfer roller 20 ... outer surface cooling device 21 ... cooling water supply tube 22 ... supply unit 23 ... outer surface cooling nozzle 30 ... inner surface cooling device 31 ... inner surface cooling water supply source tube 32 ... inner surface cooling water supply pipe 33 ... cooling water pipe 35 ... inner surface cooling nozzle 36 ... nozzle main pipe 37 ... ejection pipe 38 ... ejection outlet 40 ... delivery storage device 41 ... winding mechanism 42 ... spool 43 ... flexible accommodation cylinder 43A ... screw Stop 44 ... First cylinder 44A ... One side inclined edge 45 ... Second cylinder 45A ... Both side inclined edges 46 ... Telescopic mechanism 47 ... Drive source 50 ... Suspension device 51 ... Support beam 52 ... Moving roller 53 ... Traveling belt 54 ... Tension mechanism 55 ... Suspension mechanism 56 ... Elevating actuator 57 ... Suspension part 60 ... Guide device 61 ... Guide strut 62 ... Elevating strut machine 63 ... Guide roller 70 ... Steel pipe support mechanism 71 ... Mounting frame 72 ... Free ball base Ring

In order to solve the above-described problems, in the present invention, the reference numerals in the embodiments for carrying out the invention to be described later will be added and described, and the shaft is rotated while skew-rotating the steel pipe P discharged from the quenching furnace H. A conveying device 10 for conveying along the direction, an outer surface cooling device 20 for supplying outer surface cooling water to the outer surface of the steel pipe P to be conveyed near the outlet of the quenching furnace H, and an outer surface cooling water for the inner surface of the steel pipe P. The inner surface cooling device 30 is disposed inside the steel pipe P so as to inject and supply the inner surface cooling water corresponding to the injection supply position, and is extracted from the cooled steel pipe P, and this inner surface cooling device 30 is used in the quenching furnace H. A payout storage device that extends along the axial direction of the steel pipe P to the outlet side, arranges it on the conveying device 10, and stores the inner surface cooling device 30 extracted from the steel pipe P by shortening the length along the axial direction of the steel pipe P. 40 To.
The inner surface cooling device 30 covers the steel pipe P as it is discharged and conveyed forward in the conveying direction, and sprays and supplies inner surface cooling water to cool the inner surface of the steel pipe P. An inner surface cooling nozzle 35 is provided at the tip, and when cooling, the outer surface cooling device 20 and the steel pipe P are substantially in the same position, and after cooling is completed, the steel pipe P is retreated from the inside along the conveying direction of the steel pipe P. Thus, it can be configured to go out of the steel pipe P.
The inner surface cooling device 30 includes an inner surface cooling water supply pipe 32 that communicates with an inner surface cooling water supply source pipe 31 that is connected to a cooling water supply source, and an inner surface cooling water that is directed toward the transfer direction of the steel pipe P. An inner surface cooling nozzle 35 connected to the tip of the inner surface cooling water supply pipe 32 so as to spray can be provided.
The inner surface cooling nozzle 35 is connected to the inner surface cooling water supply pipe 32 and has a nozzle main pipe 36 closed at the tip, and is rotatably connected to the outer circumference of the nozzle main pipe 36 so as to communicate with the nozzle main pipe 36. The jet pipe 37 is formed by opening a plurality of jet outlets 38 that are directed in the transport forward direction of the steel pipe P and directed rearward in the rotation direction of the jet pipe 37 itself. can do.
The feeding storage device 40 forms the inner surface cooling water supply source pipe 31 in the inner surface cooling device 30 as a flexible one in a wound shape, and the inner surface cooling water supply source tube 31 is formed with respect to the transport forward direction of the steel pipe P. By feeding out in the reverse direction, the inner surface cooling nozzle 35 is linearly extended so as to be positioned at the outlet of the quenching furnace H, and is retracted and retracted from the inside of the steel pipe P after the cooling is completed. Thus, it can be configured as a winding mechanism 41 for reducing and storing.
The winding mechanism 41 accommodates a spool 42 rotatably supported at a front portion of the conveying device 10 in the conveying direction of the steel pipe P and an inner surface cooling water supply source pipe 31 in the inner surface cooling device 30 and winds around the spool 42. The flexible storage cylinder 43 can be configured so as to be bent so as to be rotated.
The flexible storage cylinder 43 is a cylinder having a rectangular shape in cross section, and the first cylinder 44 having a one-side inclined edge 44A by cutting both ends into a triangle shape on the bent side, and a rectangular cross section in the same manner. The cylindrical body having a shape and both end portions formed in a mountain shape are alternately arranged adjacent to each other in a state where the end portions are overlapped with each other, with the second cylindrical body 45 being inclined on both sides 45A. The end portions can be swingably connected to each other.
The inner surface cooling device 30 is suspended from above by a suspension device 50, and the suspension device 50 includes a support beam 51 disposed at a position above the transportation device 10 along the transportation direction. And a suspension mechanism 55 that reciprocates by being supported by the lower surface of the support beam 51 and suspends the inner surface cooling device 30, and the support beam 51 has a front and rear end position of the transport device 10. The traveling belt 53 is looped between the movable rollers 52 that are pivotally supported by the shaft, and the suspension mechanism 55 can be fixed to the traveling belt 53.
The inner surface cooling device 30 is supported from below by a guide device 60, and the guide device 60 includes a plurality of guide columns 61 arranged along the conveying direction of the steel pipe P. The guide columns 61 are installed. the inner surface cooling water supply pipe 32 on the inner surface cooling device 30 to the top of the lifting column device 62 which puts the surface,及beauty the housing the inner surface cooling water supply source pipe 31 which communicates with the inner surface cooling water supply pipe 3 2 It can be configured by providing a guide roller 63 for placing and guiding the rectangular flexible storage cylinder 43 in the cross section.
In addition, a steel pipe support mechanism 70 that supports the inner surface cooling device 30 inside the steel pipe P is provided in the inner surface cooling device 30, and this steel pipe inner support mechanism 70 is provided with the inner surface cooling water supply pipe 32 in the inner surface cooling device 30. A mounting frame 71 mounted around the outer periphery and a free ball bearing 72 formed by embedding a ball rolling on the inner peripheral surface of the steel pipe P can be arranged on the outer periphery of the mounting frame 71. .

As shown in FIG. 8, the flexible storage cylinder 43 is, for example, a cylinder having a rectangular shape in cross section, and a first cylinder whose both end portions are cut into a triangular shape on the bending side to form a one-side inclined edge 44 </ b> A. 44, a second cylindrical body 45 having a rectangular shape in cross section, slightly smaller than the first cylindrical body 44, and having both side inclined edges 45A by forming both ends in a mountain shape. Are arranged adjacent to each other in a state where the second cylinder 45 is fitted inside the first cylinder 44 and the ends are overlapped with each other, and the ends are swingable by, for example, screwing 43A. It is connected to. The rear end of the flexible storage cylinder 43 is fixed to the spool 42, the front end is being connected to the rear end side of the front Symbol inner surface cooling water supply pipe 32 which expands and contracts, the flexible storage cylinder 43 Oh Ru inner surface cooling water supply source pipe 31 which is accommodated communicates with the interior surface cooling water supply pipe 32. By doing so, the inner surface cooling water supply source pipe 31 can be wound around the spool 42 itself along the outer periphery of the spool 42 in a state in which the inner surface cooling water supply source pipe 31 is housed inside. Can be stored with a shorter length.

Claims (10)

  A conveying device that conveys the steel pipe discharged from the quenching furnace along the axial direction while skew-rotating, an outer surface cooling device that injects outer surface cooling water to the outer surface of the steel pipe to be conveyed near the exit of the quenching furnace, Similarly, an inner surface cooling device that is disposed inside the steel pipe so as to inject and supply the inner surface cooling water to the inner surface of the steel pipe corresponding to the injection supply position of the outer surface cooling water, and is extracted from the cooled steel pipe, and this inner surface cooling device A payout storage device that extends along the axial direction of the steel pipe to the outlet side of the quenching furnace and arranges it on the conveying device, and stores the inner surface cooling device extracted from the steel pipe by shortening the length along the axial direction of the steel pipe; A steel pipe cooling device comprising:   The inner surface cooling device is configured to cover the steel pipe to be discharged and conveyed forward in the conveying direction, and to provide an inner surface cooling nozzle for supplying inner surface cooling water to cool the inner surface of the steel pipe. At the tip, it is in the same position inside and outside the steel pipe as the outer surface cooling device at the time of cooling, and after cooling is finished, it moves backward from the inside of the steel pipe along the conveying direction of the steel pipe and goes out of the steel pipe The steel pipe cooling device according to claim 1.   The inner surface cooling device includes an inner surface cooling water supply pipe that communicates with an inner surface cooling water supply source pipe that is connected to a cooling water supply source, and an inner surface that jets the inner surface cooling water toward the transfer direction of the steel pipe. The steel pipe cooling device according to claim 1 or 2, further comprising an inner surface cooling nozzle connected to a tip of the cooling water supply pipe.   The inner surface cooling nozzle is connected to an inner surface cooling water supply pipe and has a nozzle main pipe whose tip is closed, and a jet pipe which is rotatably fitted on the outer circumference of the nozzle main pipe so as to communicate with the nozzle main pipe. 4. The cooling of the steel pipe according to claim 3, wherein the jet pipe is provided with a plurality of jet outlets which are directed in the transport forward direction of the steel pipe and directed rearward in the rotation direction of the jet pipe itself. apparatus.   The feeding storage device forms the inner surface cooling water supply source pipe in the inner surface cooling device as being flexible in a winding shape, and feeds this inner surface cooling water supply source tube in the direction opposite to the conveyance advance direction of the steel pipe. The inner surface cooling nozzle is linearly extended so as to be positioned at the exit of the quenching furnace, and retracted and retracted from the inside of the steel pipe after the cooling is completed, so that it is wound into a coiled shape so as to be reduced and stored. The steel pipe cooling device according to any one of claims 2 to 4, which is a mechanism.   The winding mechanism can be bent so that it can be wound around the spool by accommodating the spool that is rotatably supported at the front portion of the conveying direction of the steel pipe in the conveying device and the inner surface cooling water supply source pipe in the inner surface cooling device. The steel pipe cooling device according to claim 5, further comprising a formed flexible storage cylinder.   The flexible storage cylinder has a rectangular shape in cross section, and has a rectangular shape in the same cross section as the first cylindrical body that has a one-side inclined edge by cutting both ends into a triangular shape on the bending side. It is cylindrical, and both ends are formed in a mountain shape, and the second cylindrical body that is an inclined edge on both sides is alternately arranged adjacent to each other with the ends overlapped, and the ends are The steel pipe cooling device according to claim 6, wherein the steel pipe cooling device is swingably connected.   The inner surface cooling device is suspended from above by a suspension device, and the suspension device includes a support beam disposed along the transport direction at a position above the transport device, and a lower surface of the support beam. A suspension mechanism that reciprocates by being supported and that suspends the inner surface cooling device, and the support beam is provided with a traveling belt between the moving rollers that are pivotally supported at the front and rear end positions of the conveying device. The steel pipe cooling device according to any one of claims 1 to 7, wherein the steel pipe cooling device is suspended and fixed to the traveling belt.   The inner surface cooling device is supported from below by a guide device, and the guide device is composed of a plurality of guide columns arranged along the conveying direction of the steel pipe, and the guide columns are elevating columns that stand on the installation surface. 5. An inner surface cooling water supply pipe in the inner surface cooling device and a guide roller for placing and guiding a rectangular flexible storage cylinder in a cross section accommodating the inner surface cooling water supply pipe in the upper part of the machine. The steel pipe cooling device according to any one of the above.   A steel pipe support mechanism for supporting the inner surface cooling device inside the steel pipe is provided in the inner surface cooling device, and this steel pipe support mechanism is mounted so as to surround the outer periphery of the inner surface cooling water supply pipe in the inner surface cooling device. The cooling device for a steel pipe according to any one of claims 2 to 9, wherein a frame and a free ball bearing in which a ball rolling on an inner peripheral surface of the steel pipe is embedded are disposed on the outer periphery of the mounting frame.

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