JPS5835643Y2 - Internal cooling device for steel pipes - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an internal cooling device for steel pipes.

Recently, thick-walled heat-treated steel pipes have been required for applications such as deep-sea line pipes, but the heat treatment method for these steel pipes is to rapidly heat them with a separate induction device, and then rapidly cool them with a cooling device installed immediately after the heating device. Quenching is performed.

The cooling device is equipped with a cooling nozzle that injects a cooling medium, but a typical thin-walled steel pipe has only an outer surface cooling nozzle that cools only the outer peripheral surface of the steel pipe.

However, it is impossible to harden thick-walled steel pipes by using only the outside surface because the specified cooling speed cannot be achieved on the inside surface. Therefore, an inside cooling device is also required to rapidly cool the inside surface at the same time, but this cooling device cannot be quenched. An internal cooling nozzle is attached to the tip of the long boom that is shared with the water pipe, and the rear is connected to the water supply piping.

The long boom needs to be long enough to be completely inserted into the steel pipe to be treated, and the boom is held at the center of the steel pipe by an appropriate method.

During cooling, the boom passes through the inside of the treated steel pipe like a core frame, so the particular problem with this device is how to quickly pull out the boom from inside the treated steel pipe and how long the process takes.

In order to improve the productivity of the equipment, it is necessary to shorten this withdrawal time, but the solution to this problem is to make the connection between the supply pipe for supplying the cooling medium and the boom easily attachable and detachable. .

However, this connection pipe is large in size to allow a large volume of cooling water to flow through it, and general commercially available quick couplers are of no use.

Furthermore, even if a flexible hose or the like is used, the moving stroke is too long, and the diameter is large and there is no flexibility, so it cannot be used in practice.

In order to solve these problems, the present invention proposes an internal cooling device that can automatically connect the water supply pipes at the same time as the boom moves.

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

FIG. 1 is a side sectional layout view of the present invention, FIG. 2 is a sectional view taken along line II in FIG.

In Fig. 1, there are shown 1 a steel pipe for ground treatment, a pinch roll 4 and a conveyance table 5 as a device for continuously moving the steel pipe.
A heating device 3 for heating to a predetermined quenching temperature is provided with a heating coil because the figure shows an induction heating method.

The heat treatment equipment further includes an outer surface cooling device 2 and an inner surface cooling device 6 for rapidly cooling the heated material.

The inner surface cooling device 6 is equipped with a cooling nozzle 8 that injects a cooling medium at the tip of a boom 7 that also serves as a water pipe, and the rear end is U-shaped 7'.
It is formed into a shape and is detachably connected to the curved pipe 9 of the supply pipe.

Incidentally, an auxiliary clamp device may be provided at this portion.

Further, the bent pipe 9 is telescopically connected to the supply pipe 10.

The bent pipe 9 is held by a support fitting 28 having an appropriately shaped structure so as to be vertically adjustable.

The boom 7 has a cooling medium passage, and the connection with the curved pipe 9 is made by slidingly inserting one side (the boom side in the figure) into the other, as shown in FIG. 3, and sealing it with a packing 11. ing.

Although not shown, the supply pipe 10 is connected to a cooling medium supply source (not shown).

The boom 7 is suspended horizontally via a connecting member 15 of a rod 14 of a lifting device, such as a worm jack 13, mounted on a moving frame 16, and the boom 7 is configured to be vertically movable and can be adjusted in the vertical direction. The structure also allows for upward evacuation.

Although the figure shows an elevating system using a worm jack 13, an elevating device that combines both a worm jack and a cylinder may be used to enable fine adjustment and quick elevating.

Reference numeral 12 denotes a guide for positioning the boom 7, which is slidably attached to the movable frame 16, but any other appropriate method may be used.

The moving frame 16 is suspended from a guide rail 22 constructed above by a support 23 via wheels 17 that are movably installed, and is connected to an endless indexing rope made of wire foil 21, as shown in the figure. The movable frame 16 is configured to be movable in the horizontal direction by driving one of the wire foils by a drive device that does not have a drive unit.

In this example, a rope-type traction device is shown, but a chain or other traction device may also be used. In FIG.
24 is a drive device, and 27 is a frame.

Next, the operation will be explained.

The inner surface cooling device 6 is set in the position shown in FIG.

The steel pipe 1 is continuously charged into the heating device 3 using a conveyor table (not shown) on the front side and pinch rollers 4, and is rapidly heated. Immediately after heating, a cooling medium is simultaneously applied to the inner and outer circumferential surfaces by the outer cooling nozzle 2 and the inner cooling nozzle 8. The sprayed material is rapidly cooled, heat treated, and transferred to the rear transport table 5, where cooling is completed.

Immediately after cooling is completed, the tow rope is activated to move the movable frame 16 backward (to the left in the figure), and the boom 7 and nozzle 8 are moved.

At this time, the U-shaped portion 7' of the boom and the bent pipe 9 can be automatically separated.

After the nozzle 8 is pulled out from the steel pipe 1 until it is completely removed, the worm jack 13 is operated by the lifting drive device 19, and the boom 7 is raised via the rod 14 to a position where a space is secured for the steel pipe 1 to pass through the lower part. After the pipe is moved and evacuated, the steel pipe 1 is passed under the boom and discharged.

When it is paid out, the boom 7 is lowered again and horizontally moved to a predetermined position and set.

The figure shows a method in which the boom is retracted to the top, but it may also be retracted to the side.

Next time when the steel pipe size changes, it is necessary to correct the center of the boom, but at this time as well, the position of the boom 7 can be changed by operating the worm jack 13.

Note that it may be more effective to separately provide a lifting device for retracting the boom 7 to the top and an adjustment device for adjusting the center of the boom 7, so decide which method to use depending on the work conditions. Good.

Furthermore, if the wall thickness of the steel pipe changes, the position of the cooling start point of the internal cooling nozzle (where the cooling medium collides) will also change, so if it is necessary to adjust the cooling starting point to match, move the position of the internal cooling nozzle 8. The adjustment can be made by moving the frame 16 in the horizontal direction.

Although a clamp or a stopper device is not shown in the drawings on the movable frame 16, it may be provided as necessary.

As described in detail above, the present invention can easily automate the attachment and detachment of the water supply pipe section (boom curved pipe), thereby greatly improving work efficiency.

Further, when horizontal adjustment of the inner nozzle is required, the cooling start points of the inner and outer surfaces can be easily aligned, which greatly contributes to quality improvement.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional layout diagram of the present invention, FIG. 2 is a sectional view taken along line II in FIG. 7... Water pipe, 7'... Water supply pipe, 8.
... Cooling nozzle, 9.10 ... Water supply main.

Claims (1)

[Scope of utility model registration request] A movable frame 16 that can run horizontally is disposed above the water pipe 7, which has a cooling nozzle 8 at its tip and a U-shaped rear end, and is movable up and down vertically on the movable frame 16. A lifting device 13.14 is provided, and the water pipe 7 is connected to the lower end of the lifting device so that the water pipe 7 can be moved horizontally by the moving frame 16, and can be raised and lowered in the vertical direction by the lifting device 13.14. A steel pipe inner surface cooling device characterized in that a water supply pipe 9 is disposed at a position where the rear end opening of the water pipe 7 is directed.