JP5233366B2 - Steel pipe quenching equipment - Google Patents

Description

  The present invention relates to a quenching equipment for a steel pipe that is immersed in cooling water in a water tank while being heated and is uniformly quenched.

  There are quenching and tempering heat treatment methods for increasing the tensile strength and toughness of steel pipes. As steel pipe quenching equipment, in order to quench evenly, an equipment has been proposed in which a heated steel pipe is sandwiched between a rotating roller and a pinch roller and rotated while being immersed in cooling water (hereinafter referred to as water) in a water tank. (See Patent Document 1). The steel pipe quenching equipment described in Patent Document 1 is an equipment that tilts a tilting arm equipped with a rotating roller and a pinch roller from an air steel pipe receiving position to an underwater steel pipe quenching position, and is installed in a heat treatment line for carbon steel pipes. Has been.

In recent years, it has been studied to perform heat treatment of 13Cr steel pipe in the same heat treatment line. However, the 13Cr steel pipe is required to be air-cooled after being heated to the austenite region due to metallurgical restrictions.
JP-A-11-61265

  However, conventional steel pipe quenching equipment has a problem of providing an air cooling path without a path for passing the steel pipe other than the underwater quenching path. On the other hand, although the method of letting 13Cr steel pipe pass through the water tank which was drained and emptied, it takes time to drain water, and there is a problem that various installation members in the air water tank are thermally damaged, If there was a problem, it took a long time to recover and could not be adopted.

  Therefore, an object of the present invention is to provide a steel pipe quenching facility that can easily and quickly form an air cooling path that bypasses an underwater quenching path when heat treating the steel pipe.

  The present invention that has solved the above problems has a water tank inlet side device for delivering a steel pipe, and a holding mechanism that holds the steel pipe between a rotating roller and a pinch roller, and is immersed in water in the water tank while rotating the steel pipe. The steel pipe after being rapidly cooled to the unloading position in the air via the tilting arm for quenching, the underwater easy down arm and the underwater relay skid with stopper, and the steel pipe from the unloading device to the subsequent process In the quenching equipment of a steel pipe having a water tank outlet side device, the tilting arm can be retracted so that the steel pipe can pass above the water surface in the water tank between the water tank inlet side device and the carry-out device. And a chain conveyor with a skid for passing through, which can transport the steel pipe from the water tank inlet side device to the carry-out device above the water surface of the water tank, when quenching the steel pipe So as not to interfere with the immersion path of the steel pipe by serial tilting arm, a hardening equipment of the steel pipe, characterized in that arranged to be retracted.

  ADVANTAGE OF THE INVENTION According to this invention, when heat-processing a steel pipe, in addition to the underwater hardening path | pass, the air cooling path | route which bypasses it can be formed easily and in a short time.

1 and 2 are schematic side views showing an example of steel pipe quenching equipment according to the present invention.
FIG. 1 shows a case where an air-cooling path through which the steel pipe W passes is bypassed around the water tank 11 filled with water. In this case, the tilting arm 3 is tilted to a retracted position in the air.
On the other hand, FIG. 2 shows a case where a quenching path for passing the steel pipe W is formed in the water tank 11 filled with water using the same equipment as in FIG. Here, the tilting arm 3 is pivotally supported by the gantry 10, and the tilting range is from the retreat position in the air shown in FIG. 1 to the steel pipe quenching position in water shown by the solid line in FIG. is there.

First, the structure which passes the steel pipe W through the underwater hardening path | pass is demonstrated using FIG.
In this case, the tilting arm 3 reciprocates between the steel pipe receiving position indicated by the two-dot chain line in FIG. 2 and the underwater steel pipe hardening position indicated by the solid line in FIG. 2 for each steel pipe to be quenched. . And the arrow A in a figure turns into the immersion path | route of the steel pipe W by the tilting arm 3 at the time of performing a hardening process.

Further, the tilting arm 3 has a holding mechanism that holds the steel pipe W between the rotating roller 2 and the pinch roller 1 and is configured to be able to rotate while holding the steel pipe W.
That is, the two rotating rollers 2 are pivotally supported at the tip end portion of the tilt arm 3 via the bearing, and the two pinch rollers 1 are also pivotally supported via the bearing. A slide rod is attached to the pinch roller side bearing, and the slide rod is slidably inserted into a fixed member fixed to the base of the tilt arm 3.

The slide rod is connected to a pinch roller cylinder (not shown), and constitutes a holding mechanism for the steel pipe W together with the pinch roller cylinder. The two rotating rollers 2 are rotated by a rotating means (not shown). A plurality of tilting arms 3 having such a configuration are arranged in the tube axis direction of the steel pipe W.
However, when the tilting arm 3 is in the steel pipe receiving position indicated by the two-dot chain line in FIG. 2, that is, the two rotating rollers 2 are on the water surface of the water tank 11, and the two rotating rollers 2 and the two pinch rollers 1 are used. The steel pipe W is received from the water tank inlet side device 4 in a state where the space is opened. Next, the tilting arm 3 is tilted while rotating the steel pipe W between the rotating roller 2 and the pinch roller 1, and the steel pipe W is tilted to the quenching position of the steel pipe in water and quenched. This route is an underwater quenching pass. In addition to the tilting arm 3 configured as described above, the steel pipe quenching equipment of this example includes various conveying means.

  In the water tank 11, an underwater easy down arm 6 and an underwater relay skid 7 with a stopper 7a are installed. The underwater easy down arm 6 receives the steel pipe from above the rotating roller 2 spaced apart from the pinch roller 1 when the tilting arm 3 tilts to the underwater steel pipe quenching position, as shown by the broken line in FIG. , A conveying means for turning around an axis and passing it to the underwater relay skid 7. Moreover, the underwater relay skid 7 with the stopper 7a is a conveyance means which moves a steel pipe to the lowest position in water, rolling in water.

A chain conveyor 8 with an unloading skid 8a is installed as an unloading device 8 that can unload the steel pipe W stopped at the stopper 7a of the underwater relay skid 7 to an unloading position in the air.
And as the water tank exit side device 9 for delivering the steel pipe from the carry-out device 8 to the subsequent process, the water tank exit side easy-down arm 9 with a stopper 9a is installed, and on the other hand, as the water tank entrance side device 4 for delivering the heated steel pipe W A water tank entrance side easy-down arm 4 with a stopper 4a is installed. As with the underwater easy-down arm 6, these easy-down arms 4 and 9 move the steel pipe W on the arm smoothly by its own weight by turning the arm around its axis and lowering the arm. Then, the conveying means is stopped by the stoppers 4a and 9a so as not to cause surface flaws.

In addition, in order to inject the cooling water toward the outer surface of the steel pipe W at the steel pipe quenching position in the water, the outer cooling inlet header 12 is provided on the wall surface of the water tank 11, and the outer cooling is provided on the side surface of the tilt arm 3. An outgoing header 13 is provided. It is preferable to use a steel pipe quenching facility provided with such an outer surface cooling outlet header because cooling of the outer surface of the steel pipe can be promoted.
Next, the case where the present invention, that is, the air cooling path that bypasses the underwater quenching path is formed will be described with reference to FIG.

  In this case, the tilt arm 3 is tilted to the retracted position in the air. The tilt arm 3 can be tilted upward to a position that does not hinder the passage of the steel pipe W between the water tank entry side device 4 and the carry-out device 8 above the water surface filling the water tank 11. Thus, it can be retracted so as not to interfere with the air passage path of the steel pipe W. After retracting the tilting arm 3 to a position where it can be evacuated, the chain conveyor 5 with the skid 5a for evacuation is tilted around the tilting shaft 14 of the chain conveyor and is placed on the water surface. An air passage is formed.

The chain conveyor 5 is supported by the tilting shaft 14 so as to be tiltable. In the quenching process, as shown in FIG. 2, the chain conveyor 5 is positioned so as not to interfere with the immersion path A of the steel pipe W by the tilting arm 3 (hereinafter, (It is called the retracted position of the chain conveyor).
And this chain conveyor 5 can be tilted to the position where it comes out on the water surface, and is connected with the cylinder etc. (not shown) for performing this tilting operation. An arrow B in FIG. 1 indicates the tilting range of the chain conveyor. By passing the chain conveyor 5 from the retracted position of the chain conveyor shown in FIG. 2 to the position on the water surface indicated by the solid line in FIG. 1, an air passage is formed.

  At that time, the chain conveyor 5 with the air skid 5a is installed to be inclined so that the outlet side is lower than the inlet side, so that the steel pipe W received from the water tank inlet side device 4 is surely in contact with the skid 5a. A drive motor that rotates the chain of the chain conveyor 5 is built in the chain conveyor 5. Reference numeral 15 in FIG. 1 denotes a receiving stopper for the chain conveyor, which is a stopper for preventing the chain conveyor 5 from being lowered by moving the chain conveyor upward from the water surface and then moving from the right side to the left side in the figure.

According to one example of the steel pipe quenching equipment according to the present invention, the air cooling path shown in FIG. 1 can be formed easily and in a short time.
Therefore, from the operation mode in which the same steel pipe quenching equipment is used and heat-treated through the carbon steel pipe to the underwater quenching path, the operation mode in which the water tank 11 filled with water is left as it is and the heat treatment is performed through the 13Cr steel pipe in the air-cooled path is easy. And can be switched in a short time.

It is a schematic side view at the time of forming an air-cooling path | pass using the quenching installation of the steel pipe of an example concerning this invention. FIG. 2 is a schematic side view of the case where an underwater quenching path is formed using the steel pipe quenching equipment of FIG.

Explanation of symbols

W Steel pipe 1 Pinch roller 2 Rotating roller 3 Tilt arm 4 Water tank inlet side device (water tank inlet side easy down arm with stopper)
4a Stopper 5 Chain conveyor with air skid 5a Skid 6 Underwater easy down arm 7 Underwater relay skid with stopper 7a Stopper 8 Unloader (chain conveyor with skid for unloading)
8a Skid 9 Water tank outlet side device (Water tank outlet side easy down arm with stopper)
9a Stopper
10 frame
11 aquarium
12 Inlet header for external cooling
13 Outlet header for external cooling
14 Chain conveyor tilt axis

Claims (1)

A water tank inlet side device that delivers the steel pipe, a holding mechanism that holds the steel pipe sandwiched between a rotating roller and a pinch roller, and a tilting arm that immerses and quenches in the water in the water tank while rotating the steel pipe; An unloading device for unloading the steel pipe after quenching to an unloading position in the air via an underwater easy down arm and an underwater relay skid with a stopper; and a water tank unloading device for delivering the steel pipe from the unloading device to a subsequent process. Steel pipe quenching equipment
The tilt arm can be retracted so that the steel pipe can pass above the water surface in the water tank from the water tank inlet side device to the carry-out device, and further, from the water tank inlet side device above the water surface of the water tank. A quenching equipment for steel pipes characterized in that a chain conveyor with a skid for passing through the steel pipe to a carry-out device can be retracted so as not to interfere with the immersion path of the steel pipe by the tilting arm when quenching the steel pipe .

Images