JPS6028687Y2 - Pipe inner surface cooling device in steel pipe immersion hardening equipment - Google Patents

Description

[Detailed description of the invention] The present invention is a steel pipe inner surface cooling device in a steel pipe immersion hardening apparatus, and in particular, an inner surface cooling water injection nozzle that injects cooling water onto the inner surface of a steel pipe underwater by following the steel pipe as it rotates from the air into the water. Regarding equipment.

In order to make steel pipes high in tensile strength and toughness, they need to be quenched and tempered like other steel products.

BACKGROUND ART Conventionally, as a method of quenching steel pipes, a method of quenching a heated steel pipe by immersing it in water has been known.

In this case, when the steel pipe is placed in a water tank, water enters from both sides of the pipe end, making it difficult for air to escape from the pipe, causing the inner surface of the pipe to burn out.

For this reason, instead of simply immersing the entire steel pipe in water, high-pressure water is injected from one end of the pipe onto its inner circumferential surface to vent air inside the pipe and prevent uneven heating.

As an immersion hardening device in which a steel pipe is immersed in water and cooling water is jetted onto the inner peripheral surface of the steel pipe using a nozzle, the applicant has developed a steel pipe holding device consisting of a rotary drive roller and a presser roller. a tilting device that pivotally supports the rotary drive roller and the presser roller and performs a reciprocating rotation operation from the air into the water tank; A steel pipe immersion quenching apparatus has been developed which has an inner-tube water injection nozzle that is attached to the apparatus and rotates integrally with the tilting device.

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According to this immersion quenching device, the heated steel pipe is pressed and held from above and below, rotated in the air, and immersed in water while being held in this rotating state, and after quenching is completed, the pipe is transferred to the unloading device underwater. Since the steel pipes are passed and carried out of the water tank, uneven heating of the steel pipes does not occur, and damage to the steel pipes caused by dropping the steel pipes into water as in the conventional method can be prevented.

The water injection nozzle rotates water from the air in a concentric state with the steel pipe held in the steel pipe holding device, but in this case, since the cooling water to be injected is high-pressure water, the wood pipe connected to the nozzle is connected to the flexible hose. etc., there is a risk of damage, and providing a flexible hose with extra length to allow the nozzle to rotate takes up a lot of space, and the hose may sway due to high-pressure water.
There is also dancing, which is dangerous.

This invention is a tube inner cooling device with a compact structure that eliminates the risk of damage due to high-pressure water, can handle steel tubes with different diameters with a simple nozzle exchange operation, and has good followability for rotating steel tubes. The purpose is to provide

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of the main parts of an immersion hardening apparatus to which the present invention is applied.

Note that this figure was cut along a plane perpendicular to the longitudinal direction of the steel pipe set for hardening.

First, the part that supplies the steel pipe to this immersion hardening apparatus will be briefly explained.

The heated steel pipe 1 is conveyed along a conveyance line in the longitudinal direction (in a direction perpendicular to the plane of the drawing) by V-shaped conveyance rollers 2, and is stopped at the side of the quenching apparatus.

A feed-in skid 4 and an ejection arm 3 are provided on the side of the hardening device between the hardening device and the conveying line.

The steel pipe 1 on the conveyor roller 2 is scooped out onto the carry-in skid 4 by the ejection arm 3, and rolled on this skid and placed on a set of rotary drive rollers 9 of the steel pipe holding device.

A set of rotary drive rollers 9 are pivotally supported by a lower device arm 7a of a tilting device installed above the water tank 11, and are rotationally driven by a rotary motor (not shown).

The set of rotary drive rollers 9 and the set of press rollers 8 constitute a steel pipe holding device.

A set of presser rollers 8 is rotatably supported at the tip of a piston rod 17 of a cylinder device 16.

The cylinder device 16 is fixed to the tip of the upper tilting arm 7b of the tilting device.

Upper and lower tilting arms of the tilting device? a and 7b are integrally fixed to the rotating shaft 6 (9).

The rotating shaft 6 is pivotally supported by the pedestal 5, and is configured to be reversibly rotated (reciprocatingly rotated) within a predetermined angular range by a drive device (not shown) provided outside the water tank 11.

Further, an ejection arm 10 as shown is attached to the lower tilting arm 7a.

Lower tilting arm? at7b, a plurality of pairs of rotation drive rollers 9 and press rollers 8 are provided along the longitudinal direction of the steel pipe 1 at appropriate intervals.

A water jet nozzle is fixed to the shaft end of the rotating shaft 6 of the tilting device and is adjusted to be positioned concentrically with the steel pipe 1 on the rotary drive roller 9.

Note that the water injection nozzle does not appear in the cross-sectional position shown in FIG.

The water injection nozzle will be further described later. Inside the water tank 11, a receiver having a concave steel pipe receiving portion is pivotally supported so that an arm 14 can rotate within a predetermined angular range.

Further, the water tank 11 is provided with a circulating conveyor device whose entire lower half is immersed in the water of the water tank and whose upper portion only projects obliquely upward from the water surface 18.

This conveyor device is constructed by, for example, an endless chain 20 wound around sprockets at both ends, and a plurality of steel pipe receiving hooks 19 attached to the outer surface of the chain at predetermined intervals.

The endless chain 20 rotates in the direction of the arrow shown by the rotation of the sprocket.

Near the upper end of the conveyor device, an aerial conveyance device for quenched steel pipes is provided.

An underwater skid 21 is provided between the receiver arm 14 and the conveyor device 15 for rolling the steel pipe discharged from the receiver arm 14 and passing it to the conveyor device 15.

The rotary driving roller 9, which is pivotally supported by the lower tilting arm 7a of the tilting device, is in the air position shown in the figure when it receives the steel pipe that has rolled on the carry-in skid 4, and from this position, the rotary shaft 6
When the arm 14 rotates, the arm 14 rotates in the direction A about the rotation axis and is immersed in water, and the receiver stops near the upper limit position of the arm 14.
It is designed to reciprocate between these regions by rotating the rotating shaft 6 in forward and reverse directions.

Further, inside the water tank, external jet headers 13 are opened along the movement path of the rotary drive roller 9 and on both sides thereof.

The external injection header 13 injects water onto the external surface of the steel pipe underwater,
This allows uniform cooling of the outer surface of the tube while stirring the water.

FIG. 2 is a schematic side view of the steel pipe immersion hardening apparatus described above.

Note that this figure shows the state in which the steel pipe 1 is immersed in water.

Moreover, FIG. 3 is a perspective view of the tube inner surface cooling device according to the present invention.

An arm 33 is fixed to one end of the rotating shaft 6 of the tilting device, and a water injection nozzle 30 is attached to this arm 33 so as to be concentric with the steel pipe 1 on the steel pipe holding device.

On the outside of the water tank 11, a rigid water pipe 32 is fixed to a suitable support member coaxially with the rotating shaft 6.

This fixed water pipe 32 and the nozzle 30 on the arm are connected by a rigid crank pipe 34 bent into an L shape.

One end 34a of the rigid crank pipe 34 is removably connected to the nozzle 30, and the other end 34b is connected to the water pipe 32 via a rotary joint 35.

Note that a water supply hose 36 for high-pressure water led from a water supply pump (not shown) is connected to the fixed water supply pipe 32.

As mentioned above, when the steel pipe held by the steel pipe holding device makes a radial arc movement about the rotating shaft 6 of the tilting device,
The nozzle 30 and the rigid crank pipe 34 also rotate about the axis of the rotating shaft 6 and follow the steel pipe 1.

Since the crank pipe 34, which is a movable part, is made of a rigid steel or iron pipe instead of a flexible hose, it will not be damaged by high-pressure water and will not shake due to phenomena such as water hammer.

Unlike a flexible hose, there is no need to hang it down with extra length, and the overall structure can be extremely compact.

The pressing force of the presser roller in the air is usually 100k. degree.

In the present invention, the water injection nozzle 30 is removable from the arm 33 and the rigid crank tube 34.

For example, the nozzle 30 and the crank pipe 34 are connected by a plug-in type connecting means.

When the outer diameter of the steel pipe to be hardened changes, only the nozzle 30 is replaced.

In this case, as shown by the broken line in FIG. 4, when the size of the steel pipe 1 is changed to one with a larger inner and outer diameter and the center axis of the steel pipe is moved from the position 35 to the position 36, the tip opening 30a is located at the nozzle base. A nozzle 30' is attached to the rigid crank tube 34 such that it is offset from the center of the nozzle 30b.

This allows the center of the steel pipe to match the nozzle tip without changing the support arm 33 and crank pipe 34 of the nozzle.

Further, in the tube inner surface cooling device of the present invention, as shown in FIG. 2, a partition plate 31 is preferably provided on the water surface 18 of the water tank 11 between the water injection nozzle 30 and the steel tube 1 on the steel tube holding device.

The width of the partition plate 31 is such that when the water injection nozzle 30 turns around the rotating shaft 6 before going under the water surface, it blocks the water ejected from the nozzle and prevents the water from being ejected toward the tip of the nozzle. Form.

When the nozzle 30 further turns and passes through the lower end 31a of the partition plate 31 and enters the water together with the steel pipe 1, the tip of the nozzle is not blocked by the partition plate 31, so cooling water can be injected into the steel pipe 1. becomes.

Therefore, if the cooling water is continuously spouted from the time when the nozzle 30 rotates in the air, the inner surface of the tube can be cooled at the same time that the steel tube 1 enters the water.

This arrangement, in conjunction with the structure of the rigid crank tube 34, provides a very useful cooling effect.

Note that when the steel pipe is quenched while immersed in water, the pressing force of the presser roller 8 in the water is stronger than that in the air, and is usually about 500 kg.

When the rotary drive roller 9 is in the vicinity of the arm 14 for a certain period of time, the presser roller 8 rises to release the pressing force, and the ejection arm 10 provided on the lower arm 7a operates, and the rotary drive roller 9 The upper steel pipe 1 is kicked out from below and the receiver is passed to the recessed part of the arm 14.

After passing the steel pipe 1 to the receiving arm 14, the rotating shaft 6 rotates in the opposite direction, and the upper and lower tilting arms 7b, ? In a, the steel pipe support returns to its original position.

In response to this, the arm 14 rotates to the position shown by the broken line in the figure, whereby the steel pipe falls onto the ice skid 21 under its own weight, rolls on it, and is received by the steel pipe receiving hook 19 of the conveyor device 15.

The receiving arm 14 returns to the upper limit position, and the conveyor device 1
The hardened steel pipe held at 5 is carried out of the tank from the upper end of the device 15.

Note that the operation timing of each member of the device is automatically determined by timer settings or the like.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a steel pipe immersion quenching apparatus to which the present invention is applied, Fig. 2 is a schematic side view of a steel pipe immersion quenching apparatus according to the present invention, and Fig. 3 is a schematic side view of a steel pipe immersion quenching apparatus according to the present invention. FIG. 4, which is a perspective view of the tube inner surface cooling device, is a diagram showing a nozzle replacement state when changing the steel tube size. 1... Steel pipe, 6... Rotating shaft, 8...
... Presser roller, 9 ... Rotation drive roller, 1
1...water tank, 30...water jet nozzle,
32... Fixed water pipe, 33... Arm for nozzle support, 34... Rigid crank pipe, 3
5...Rotary joint.

Claims (1)

[Scope of utility model registration request] A steel pipe holding device consisting of a rotary drive roller and a presser roller, and a tilting device that pivotally supports the rotary drive roller and the presser roller and performs a reciprocating rotation operation from the air into the water tank, and the heated steel pipe is In the steel pipe immersion hardening apparatus, which rotates in the air while being pressed and held from above and below by both rollers, and is immersed in water while being held while rotating, an arm is attached to the shaft end of the rotating shaft of the tilting device. a nozzle that is attached to the steel pipe and is formed so that at least its tip opening is in the same layer as the steel pipe on the steel pipe holding device; a fixed water pipe that is arranged so that it is in the same layer as the tilting axis; a rigid crank pipe connected to the front nozzle and the other end connected to the fixed water pipe via a rotary joint;
A tube inner surface cooling device characterized in that the nozzle can be replaced depending on the diameter of the steel tube.