JP2012031444A - Apparatus for quenching steel pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for quenching a steel pipe, which controls the occurrence of a decrease in strength, a bent and the like in a quenched steel pipe, which is caused by a decrease in quenching rate of the steel pipe or nonuniform cooling to the steel pipe when immersing the heat treated steel pipe into the water stored in a quenching water tank to quench the steel pipe.SOLUTION: The apparatus for quenching a steel pipe, immerses the heat treated steel pipe P into the water stored in the quenching water tank 11 to quench the steel pipe. The apparatus for quenching a steel pipe, includes: a steel pipe immersion mechanism 1 for receiving the steel pipe in the upper position of the quenching water tank and immersing the steel pipe into the stored water, while rotating the steel pipe; a cooling water jetting pipe 23 that can jet cooling water to an external surface spreading across the whole length of the steel pipe over the period from the reception of the steel pipe by the steel pipe immersion mechanism to the immersion of the steel pipe into the stored water; a cooling water shielding device 2 for shielding the cooling water jetted from the cooling water jetting pipe to the external surface of the steel pipe; and a cooling water shield removal mechanism 3 for removing the shielding of the cooling water by the cooling water shielding device.

Description

  The present invention relates to a steel pipe quenching apparatus used when quenching steel pipes such as seamless steel pipes and hot extruded steel pipes.

Many steel pipes such as seamless steel pipes are quenched in order to improve strength and hardness.
For example, Patent Document 1 proposes a steel pipe quenching apparatus 10 having a configuration as shown in FIGS. 3 and 4 in order to quench the steel pipe uniformly over its entire length. The steel pipe quenching apparatus 10 quenches the heat-treated steel pipe P while rotating it in the quenching water tank 11, and includes a rotating arm 12, an arm drive shaft 14, a steel pipe support mechanism 15, and a steel pipe clamping mechanism 19. And a cooling water injection pipe 23.

The rotating arm 12 is for dipping and quenching the steel pipe P in water stored in the quenching water tank 11 (hereinafter referred to as “reserved water”). The rotating arm 12 is attached to the arm drive shaft 14. It is installed.
The arm drive shaft 14 drives the rotating arm 12 around a horizontal axis at a position above the quenching water tank 11, and the arm drive shaft 14 is disposed horizontally above the quenching water tank 11.

The steel pipe support mechanism 15 rotatably supports the steel pipe P at the tip end portion of the rotating arm 12, and has a plurality of steel pipe support rollers 17 that support the steel pipe P horizontally at the tip end portion. The steel pipe support roller 17 is connected to the roller drive shaft 18, and the steel pipe P being supported can be rotated as indicated by an arrow C by rotating the steel pipe support roller 17.
The steel pipe clamping mechanism 19 is configured to rotatably clamp the steel pipe P with the steel pipe support mechanism 15, and the steel pipe clamping mechanism 19 includes a plurality of pinch rollers 21 disposed above the steel pipe support roller 17, Each has a pinch roller lifting cylinder 22 that drives the pinch roller 21 to move up and down.

The cooling water injection pipe 23 injects cooling water over the entire length of the steel pipe P onto the outer surface of the steel pipe P sandwiched between the steel pipe support mechanism 15 and the steel pipe holding mechanism 19. It is installed horizontally facing the outer surface of the steel pipe P.
In the vicinity of the quenching water tank 11, a steel pipe supply device 24 for supplying the steel pipes P one by one to the distal end of the rotating arm 12 is installed, and inside the quenching water tank 11 from the distal end of the rotating arm 12. A steel pipe transfer device 25 that receives the steel pipe P and transfers it to the steel pipe carry-out position in the quenching water tank 11 is provided, and the steel pipe P transferred to the steel pipe carry-out position by the steel pipe transfer device 25 is placed outside the quench water tank 11. A steel pipe carry-out device 26 for carrying out is provided.

JP 2009-242863 A

  In such a steel pipe quenching apparatus, as shown in FIG. 4A, when the heat-treated steel pipe P is supported on the tip of the rotating arm 12 by the steel pipe support mechanism 15, the pinch of the steel pipe clamping mechanism 19 is pinched. The roller raising / lowering cylinder 22 operates. As a result, as shown in FIG. 4A, the steel pipe P supplied from the steel pipe supply device 24 to the distal end portion of the rotating arm 12 is sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19. When the steel pipe P supplied from the steel pipe supply device 24 to the distal end portion of the rotating arm 12 is sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19, as shown in FIG. The moving arm 12 is rotated by a predetermined angle in the clockwise direction in FIG. 4, and the steel pipe P sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19 is immersed in the stored water in the quenching water tank 11.

When the steel pipe P is sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19, the steel pipe support roller 17 of the steel pipe support mechanism 15 is driven to rotate in a predetermined direction by the roller drive shaft 18, and the cooling water injection is performed. Cooling water is jetted from the pipe 23 to the steel pipe P. In the steel pipe hardening apparatus mentioned above, it is going to quench the heat-treated steel pipe P uniformly over a full length.
However, before the steel pipe P sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19 is immersed in the stored water in the quenching water tank 11, the cooling water from the cooling water injection pipe 23 is applied to the outer surface of the steel pipe P. When injected, when the heat-treated steel pipe P is immersed in the stored water of the quenching water tank 11 and quenched, the quenching speed of the steel pipe P is lowered, the strength is lowered, and the cooling rate is not uniform. There was a risk of bending.

  The present invention has been made in view of the above-mentioned circumstances, and when the heat-treated steel pipe is immersed in the water stored in the quenching water tank and quenched, the quenching speed of the steel pipe is lowered and the strength is lowered or the cooling speed is lowered. An object of the present invention is to provide a steel pipe quenching apparatus capable of suppressing the occurrence of bending without being uniform.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention is a steel pipe quenching apparatus for quenching by immersing a heat-treated steel pipe in a stored water in a quenching water tank, The steel pipe is received in the upper position, and has a steel pipe immersion mechanism that is immersed in the stored water in a state where the steel pipe is rotated, and the steel pipe immersion mechanism receives the steel pipe and then immerses it in the stored water. Cooling water injection pipe capable of injecting cooling water to the outer surface over the entire length of the steel pipe, cooling water blocking means for blocking cooling water injection from the cooling water injection pipe to the outer surface of the steel pipe, and the cooling water blocking means And a cooling water cutoff release mechanism for releasing the cooling water cutoff.

  The invention according to claim 2 of the present invention is the steel pipe quenching apparatus according to claim 1, wherein the steel pipe immersing mechanism immerses and quenches the heat-treated steel pipe in stored water in a quenching water tank. A pivot arm, an arm drive shaft that drives the pivot arm about a horizontal axis at an upper position of the quenching water tank, and a steel pipe support mechanism that rotatably supports the steel pipe at the tip of the pivot arm And a steel pipe clamping mechanism that rotatably clamps the steel pipe between the steel pipe support mechanism, and the cooling water shut-off means shuts off the cooling water from the cooling water jet pipe before the steel pipe. A cooling water blocking plate and a blocking plate support shaft that rotatably supports the cooling water blocking plate with respect to the rotating arm, and the cooling water blocking release mechanism is one end of the blocking plate support shaft. A blocking release member mounted on the cooling water, and the cooling water via the blocking release member The sectional plate is characterized in that comprising a cooling water unblocking cylinder for driving around the axis of the blocking plate support shaft.

  According to the steel pipe hardening apparatus according to the present invention, the cooling water blocking means can prevent the cooling water from the cooling water injection pipe from hitting the outer surface of the steel pipe before the steel pipe is immersed in the stored water of the quenching water tank. Therefore, when the heat-treated steel pipe is immersed in the water stored in the quenching water tank and quenched, the quenching speed of the steel pipe decreases or becomes non-uniform, leading to a decrease in strength or bending of the steel pipe. This can be suppressed.

It is a figure which shows the side of the steel pipe hardening apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating operation | movement of the steel pipe hardening apparatus which concerns on one Embodiment of this invention. It is a figure which shows the side surface of the conventional steel pipe hardening apparatus. It is a figure for demonstrating operation | movement of the conventional steel pipe hardening apparatus.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a view showing a side surface of a steel pipe quenching apparatus according to an embodiment of the present invention. A steel pipe quenching apparatus 10 according to an embodiment of the present invention receives a steel pipe P at an upper position of a quenching water tank 11, The steel pipe immersion mechanism 1 is immersed in the stored water of the quenching water tank 11 while the steel pipe is rotated, and the steel pipe immersion mechanism 1 receives the steel pipe P and then immerses it in the stored water. Cooling water injection pipe 23 that can inject cooling water, cooling water blocking means 2 that blocks cooling water injection from the cooling water injection pipe 23 to the outer surface of the steel pipe P, and release of cooling water blocking by the cooling water blocking means 2 are canceled. The cooling water shut-off release mechanism 3 is provided.

The steel pipe immersion mechanism 1 includes a rotating arm 12, an arm drive shaft 14, a steel pipe support mechanism 15, and a steel pipe clamping mechanism 19.
The rotating arm 12 is for immersing and quenching the steel pipe P in the stored water of the quenching water tank 11, and the rotating arm 12 is attached to the arm drive shaft 14.
The arm drive shaft 14 drives the rotating arm 12 around a horizontal axis at a position above the quenching water tank 11, and the arm drive shaft 14 is disposed horizontally above the quenching water tank 11.

The steel pipe support mechanism 15 rotatably supports the steel pipe P at the tip of the rotating arm 12, and the steel pipe support mechanism 15 includes a plurality of steel pipe support rollers 17 that horizontally support the steel pipe P, and the steel pipe support. Each has a plurality of roller drive shafts 18 for rotationally driving the roller 17.
The steel pipe clamping mechanism 19 is configured to rotatably clamp the steel pipe P with the steel pipe support mechanism 15, and the steel pipe clamping mechanism 19 includes a plurality of pinch rollers 21 disposed above the steel pipe support roller 17, Each has a pinch roller lifting cylinder 22 that drives the pinch roller 21 to move up and down.

A plurality of rotating arms 12 are arranged on the arm drive shaft 14 at a predetermined interval in the length direction (direction perpendicular to the paper surface in FIG. 1), and are provided at the tips of the respective rotating arms 12. The steel pipe P can be horizontally supported by the steel pipe support mechanism 15.
The cooling water injection pipe 23 injects cooling water over the entire length of the steel pipe P onto the outer surface of the steel pipe P sandwiched between the steel pipe support mechanism 15 and the steel pipe holding mechanism 19. A plurality of rotating arms 12 arranged along the arm drive shaft 14 are horizontally installed.

The cooling water blocking means 2 includes a cooling water blocking plate 27 for blocking the cooling water from the cooling water injection pipe 23 in front of the steel pipe P sandwiched between the steel pipe support roller 17 and the steel pipe clamping mechanism 19, and the cooling water blocking. A blocking plate support shaft 28 that supports the plate 27 so as to be rotatable with respect to the rotary arm 12 is provided.
The cooling water cutoff release mechanism 3 is configured to drive the cooling water cutoff plate 27 around the axis of the cutoff plate support shaft 28 to release the cooling water cutoff by the cooling water cutoff plate 27. Is a blocking release member 30 mounted on one end of the blocking plate support shaft 28, and a cooling water blocking release cylinder 31 that drives the cooling water blocking plate 27 around the blocking plate support shaft 28 via the blocking release member 30. And is configured.

  In the vicinity of the quenching water tank 11, a steel pipe supply device 24 for supplying the steel pipes P one by one to the distal end of the rotating arm 12 is installed, and inside the quenching water tank 11 from the distal end of the rotating arm 12. A steel pipe transfer device 25 that receives the steel pipe P and transfers it to the steel pipe carry-out position in the quenching water tank 11 is provided, and the steel pipe P transferred to the steel pipe carry-out position by the steel pipe transfer device 25 is placed outside the quench water tank 11. A steel pipe carry-out device 26 for carrying out is provided.

FIG. 2 is a view for explaining the operation of the steel pipe quenching apparatus according to one embodiment of the present invention. Hereinafter, the operation of the steel pipe quenching apparatus according to one embodiment of the present invention will be described with reference to FIG. .
In the steel pipe hardening apparatus 10 according to the embodiment of the present invention configured as described above, when the heat-treated steel pipe P is supported by the tip end portion of the rotating arm 12 by the steel pipe support mechanism 15, the steel pipe clamping mechanism. Nineteen pinch roller lifting cylinders 22 operate. As a result, as shown in FIG. 2A, the steel pipe P supplied from the steel pipe supply device 24 to the distal end portion of the rotating arm 12 is sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19. In this state, the reception of the steel pipe P at the upper position of the quenching water tank 11 by the steel pipe immersion mechanism 1 is completed. Next, the steel pipe support roller 17 of the steel pipe support mechanism 15 rotates when the drive shaft 18 is rotated by a roller drive mechanism (not shown) to rotate the steel pipe P that is supported. Then, as shown in FIG. 2B, the rotating arm 12 is rotated clockwise by a predetermined angle in FIG. 2, and the steel pipe P sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19 is moved. It is immersed in the stored water of the quenching water tank 11.

At the stage where the steel pipe immersion mechanism 1 receives the steel pipe P at a position above the quenching water tank 11 (the state shown in FIG. 2A), cooling water is injected from the cooling water injection pipe 23. However, while the steel pipe P is above the quenching water tank 11, that is, in a state where the steel pipe P is not immersed in the stored water, if the cooling water from the cooling water injection pipe 23 hits the steel pipe P, the steel pipe P The cooling rate is reduced, and uneven cooling occurs. After the steel pipe immersion mechanism 1 immerses the steel pipe P in the stored water in the quenching water tank 11, the injection of the cooling water from the cooling water injection pipe 23 may be started. In this case, the steel pipe P is stored in the stored water. It takes time until the cooling water is jetted from the cooling water jet pipe 23 after being immersed in the water, resulting in a decrease in cooling rate and uneven cooling.
In the present embodiment, the cooling water blocking plate 27 of the cooling water blocking means 2 can block the cooling water from the cooling water injection pipe 23 before the steel pipe P. Specifically, the cooling water blocking release cylinder 31 is set in a contracted state, whereby the cooling water blocking plate 27 is held at a position passing between the cooling water injection pipe 23 and the steel pipe P.

  Further, when the steel pipe P sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19 is immersed in the stored water in the quenching water tank 11, the cooling water cutoff release cylinder 31 of the cooling water cutoff release mechanism 3 operates. The end of the cooling water cutoff release cylinder 31 pushes down the cutoff release member 30 to rotate the cutoff plate support shaft 28. As a result, as shown in FIG. 2B, the cooling water blocking plate 27 rotates counterclockwise in FIG. 2 around the blocking plate support shaft 28 and the cooling water blocking plate 27 blocks the cooling water. Canceled.

  Therefore, in one embodiment of the present invention described above, the steel pipe P sandwiched between the steel pipe support mechanism 15 and the steel pipe clamping mechanism 19 is removed from the cooling water injection pipe 23 before being immersed in the stored water of the quenching water tank 11. Since the cooling water does not hit the outer surface of the steel pipe P and the steel pipe P is immersed in the stored water, the cooling water blocking by the cooling water blocking plate 27 can be quickly released. It is possible to prevent the quenching speed of the steel pipe P from being lowered when the steel pipe P is immersed in the stored water in the water tank 11 to cause a reduction in strength or bending.

DESCRIPTION OF SYMBOLS 1 ... Steel pipe immersion mechanism 2 ... Cooling water interruption | blocking means 3 ... Cooling water interruption | blocking cancellation | release mechanism 10 ... Steel pipe hardening apparatus 11 ... Quenching water tank 12 ... Rotating arm 14 ... Arm drive shaft 15 ... Steel pipe support mechanism 17 ... Steel pipe support roller 18 DESCRIPTION OF SYMBOLS ... Roller drive shaft 19 ... Steel pipe clamping mechanism 21 ... Pinch roller 22 ... Pinch roller raising / lowering cylinder 23 ... Cooling water injection pipe 24 ... Steel pipe supply device 25 ... Steel pipe transfer device 26 ... Steel pipe carry-out device 27 ... Cooling water shut-off plate 28 ... Shut-off plate Support shaft 30 ... Closing release member 31 ... Cooling water cutoff release cylinder

Claims (2)

  A steel pipe quenching device for immersing and quenching a heat-treated steel pipe in a stored water in a quenching water tank, wherein the steel pipe is received at an upper position of the quenching water tank, and the stored water is rotated in a state where the steel pipe is rotated. A cooling water injection pipe capable of injecting cooling water to the outer surface over the entire length of the steel pipe, while the steel pipe immersion mechanism is immersed in the stored water after the steel pipe immersion mechanism has received the steel pipe, A cooling water blocking means for blocking the cooling water injection from the cooling water injection pipe to the outer surface of the steel pipe, and a cooling water blocking release mechanism for releasing the blocking of the cooling water by the cooling water blocking means. Steel pipe quenching equipment. 2. The steel pipe quenching apparatus according to claim 1, wherein the steel pipe immersing mechanism includes a rotating arm for immersing and quenching the heat-treated steel pipe in a stored water in a quenching water tank, and the rotating arm as the quenching arm. An arm drive shaft that drives around a horizontal axis at a position above the water tank, a steel pipe support mechanism that rotatably supports the steel pipe at the tip of the rotating arm, and the steel pipe between the steel pipe support mechanism A steel pipe clamping mechanism that clamps rotatably,
The cooling water blocking means includes a cooling water blocking plate that blocks cooling water from the cooling water injection pipe in front of the steel pipe, and a blocking that supports the cooling water blocking plate so as to be rotatable with respect to the rotating arm. A plate support shaft,
The cooling water cutoff release mechanism includes a cutoff release member attached to one end of the cutoff plate support shaft, and cooling that drives the cooling water cutoff plate around the axis of the cutoff plate support shaft via the cutoff release member. A steel pipe quenching device comprising a water shut-off release cylinder.

Images