JPS591771B2 - steel pipe hardening equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel pipe hardening apparatus, and more particularly to a steel pipe hardening apparatus comprising an outer surface cooling header that cools the outer surface of the steel pipe and an inner surface cooling header that cools the inner surface of the steel pipe.

FIG. 1 is an explanatory diagram showing a conventional steel pipe hardening apparatus.

The steel pipe 1 advances to the right while spirally moving above the conveyor table 2, and after being heated to a predetermined temperature by the heating device 3, the steel pipe 1 is supported by the inner boom 4 and placed so as to face the inner surface of the steel pipe 1. a header 5 and an outer surface cooling header 6 arranged to surround the outer surface of the steel pipe 1
At each step, the steel pipe 1 is rapidly cooled and hardened by cooling water jetted onto the inner and outer surfaces thereof.

However, in such conventional steel pipe hardening equipment, when the steel pipe 1 is bent and deformed, the direction in which the cooling water is ejected from the inner cooling header 5 and the outer cooling header 6 is aligned with the surface of the steel pipe 1. Since the angle is set, a deviation E of the cooling point occurs in the axial direction of the steel pipe 1.

When the cooling point of the steel pipe 1 deviates in this way, there is a problem that a predetermined cooling rate cannot be obtained and hardenability is inhibited.

The present invention has been made in view of the above-mentioned conventional problems, and provides a steel pipe hardening device that moves a cooling header in accordance with the bending of the steel pipe to be hardened, and does not cause deviation of the cooling point. With the goal.

In order to achieve the above object, the present invention provides a steel pipe hardening apparatus comprising an outer surface cooling header that cools the outer surface of a steel pipe and an inner surface cooling header that cools the inner surface of the steel pipe. A plurality of guide rollers that come into contact with the surface at multiple positions to align the center of the header body with the center of the steel pipe, a nozzle that is disposed opposite to the outer peripheral surface of the steel pipe and spouts cooling water, and an elastic boom that supports the header body on a cantilever. , a balance maintaining device interposed between the elastic boom and the side struts and between the header body and the floor, and the internal cooling header is in contact with a plurality of positions on the inner peripheral surface of the steel pipe, and the header A plurality of guide rollers that align the center of the main body with the center of the steel pipe, a nozzle that is disposed opposite to the inner peripheral surface of the steel pipe and spouts cooling water, and a header main body that cantilevers support the header main body and extend in the same direction as the elastic boom of the external cooling header. and an extending elastic boom.

The embodiments of the present invention will be described above with reference to the drawings.

FIGS. 2 to 8 are explanatory diagrams showing an embodiment of the steel pipe hardening apparatus according to the present invention.

In this embodiment, the external cooling header 6 is formed as shown in FIGS. 2 and 3.

That is, the steel pipe 11 is moved rightward in the figure while being spirally moved by a transport table (not shown), and is heated to a predetermined temperature by the heating device 12.

On the exit side of this heating device 12, an external header body 1 is supported cantilevered by an elastic boom 13 which is elastically deflectable.
4 is placed.

The outer header main body 14 has a ring shape surrounding the outer peripheral surface of the steel pipe 11, and a plurality of nozzles 15 forming a certain angle with the outer surface of the steel pipe 11 are arranged at predetermined intervals in the circumferential direction.

Cooling water is supplied to the nozzle 15 via the elastic boom 13 and the branch pipe 16.

Further, at a plurality of positions in the circumferential direction of the outer header body 14 facing the steel pipe 11, as shown in FIG.
7 is provided.

Inside the case 17, a rod with a fork 19, which is biased toward the center of the steel pipe 11 via a spring 18, is held by an adjustment nut 20.

A steel pipe 11 is attached to the tip fork part of the rod with fork 19.
A guide roller 21 is attached that comes into contact with the outer surface of.

Furthermore, between the external header main body 14 and the floor, a balance device, for example a return spring device 22 is provided, and an elastic boom 13 is also provided.
A return spring device 23 is interposed between the header and the pillar to hold the outer header main body 14 in its normal position before the steel pipe 11 enters.

The return spring device 22 (the return spring device 23 is also constructed in a similar manner).

) is formed as shown in FIG. An upper case 28 is connected to the receiver having a hole through a plate 27.

The upper case 28 has a spring 29 between the receiver and the plate 27.
The receiver is plate 30, and the receiver is plate 30.
A rod 31 to which is fixed is inserted.

The upper end of the rod 31 is integrated with a connecting member 33 fixed to the outer header body 14 via a pin 32.

That is, in this external cooling header, before the steel pipe 11 enters, the external header main body 1 is held in the normal position in the vertical and horizontal directions by the return spring devices 22 and 23.
4 is held, and when the steel pipe 11 enters, the guide roller 21
are in contact with multiple positions on the outer circumferential surface of the steel pipe 11, and the elastic boom 13 is bent to move the outer header body 14 vertically and horizontally in accordance with the bending of the steel pipe 11.

Therefore, the spring force of the spring 18 biasing the guide roller 21 is equal to the elastic force of the elastic boom 13 and the return spring device 2.
The outer header body 14 resists the spring force provided by 2 and 23.
At the same time, the steel pipe 11 is deformed into an elliptical shape,
When the guide roller 21 rides on the weld bead on the surface of the steel pipe 11, the spring force is selected so that it can be retracted.

The spring force of the spring 18 is preset by the adjustment nut 20 at the position where the steel pipe 11 and the guide roller 21 come into contact, so that even when the weld bead collides with the guide roller 21, only the collided guide roller 21 is evacuated. However, the center of the outer header main body 14 is maintained in a state where it coincides with the center of the steel pipe 11.

Next, FIGS. 6 and 7 are explanatory diagrams showing the internal cooling header in this embodiment.

That is, the steel pipes 11 are installed at multiple positions on the outer peripheral surface of the inner header main body 35 that is cantilever-supported by the elastic boom 34.
A nozzle 36 is arranged to form a certain angle with the inner surface of the header body 35, and a plurality of cases 37 are provided that can be skewed in accordance with the helical movement angle of the steel pipe 11 with respect to the inner header body 35.

Inside the case 37, a forked rod 39 is held by an adjusting nut 40, which is biased in the radial direction via a spring 38, as in the external cooling header.

A steel pipe 1 is attached to the tip fork portion of each forked rod 39.
A guide roller 41 that can come into contact with the inner surface of the roller 1 is provided.

Further, a leg portion 42 is provided protruding from the intermediate portion of the elastic boom 34 with a length that can be accommodated in the internal space of the steel pipe 11, and a cylinder device 43 is provided on the floor surface facing the leg portion 42.

A support stand 45 is provided at the tip of the piston rod 44 of the cylinder device 43, and the support stand 45 comes into contact with the leg part 42 at the maximum stroke of the piston rod 44, and the elastic boom 34
can be supported in its normal position.

In addition, in the figure, 46 is a guide plate, and 47 is a guide rod.

That is, in this internal cooling header, before the steel pipe 11 enters, the cylinder device 43 is actuated to support the legs 42 on the support base 45, and the elastic boom 34 and the internal header main body 35 are held in their normal positions. At the time of entry, the guide rollers 41 of the inner header body 35 are brought into contact with a plurality of positions on the inner peripheral surface of the steel pipe 11, so that the elastic boom 34 can be bent to align the center of the inner header body 35 with the center of the steel pipe 11.

Here, the spring force of the spring 38 urging the guide roller 41 makes it possible to guide the inner header main body 35 against the elastic force of the elastic boom 34 and the own weight of the elastic boom 34, and also allows the steel pipe 11 to The guide roller 41 is selected to have a size that allows it to be retracted in the event of bending and deformation or if the guide roller 41 climbs onto the weld bead.

Next, the operation of the above embodiment will be explained.

The steel pipe 11 to be hardened is spirally moved by a transport table (not shown), heated to a predetermined temperature in a heating device, and then transferred to an outer header body 14 and an inner header body 35 disposed on the outlet side of the heating device 12. Pass through the space between the two.

During this passage, the cooling water injected by the nozzle 15 of the outer header body 14 and the nozzle 36 of the inner header body 35 is injected at the same inclination angle to the outer surface and inner surface of the steel pipe 11, and The outer surface is cooled and hardened at a predetermined cooling rate.

At this time, when the steel pipe 11 is bent and deformed, the nozzle 15 is bent and deformed so that the guide roller 21 of the external header body 14 is in contact with the outer peripheral surface of the steel pipe 11 and moves accordingly. The injection angle with respect to the outer surface of the steel pipe 11 does not change, and the elastic boom 34 is deflected and deformed so as to follow the movement while being in contact with the inner surface of the steel pipe 11 at the guide roller 41 of the inner header main body 35. The spray angle of the nozzle 36 with respect to the inner surface of the steel pipe 11 also does not change, and the cooling rate of the steel pipe 11 by the nozzle 15 and the nozzle 36 is always kept constant.

Note that when the weld bead existing on the inner and outer surfaces of the steel pipe 11 comes into contact with some guide rollers 21 of the outer header body 14 or some guide rollers 41 of the inner header body 35, the corresponding guide rollers 21 .41 can be retracted, the center position of the outer header body 14 or the inner header body 35 does not shift from the center of the steel pipe 11, and therefore the cooling water from the nozzle 15 or the nozzle 36 to the inner and outer surfaces of the steel pipe 11 does not shift. The injection state is maintained at a predetermined state.

According to the above embodiment, the nozzle 15 of the outer header body 14 and the inner header body 3 are connected to the inner and outer surfaces of the steel pipe 11.
The injection angle of the nozzle 36 of No. 5 is always kept constant, the cooling point does not deviate between the inner and outer surfaces, the cooling rate is improved, and a steel pipe with good hardenability can be obtained.

Further, when there is no need to increase the cooling rate, the amount of cooling water to be supplied can be reduced.

As described above, the present invention includes an outer surface cooling header that cools the outer surface of a steel pipe, an inner surface cooling header that cools the inner surface of the steel pipe,
In the steel pipe hardening apparatus, the external cooling header includes a plurality of guide rollers that contact the outer peripheral surface of the steel pipe at multiple positions to align the center of the header body with the center of the steel pipe, and a plurality of guide rollers arranged opposite to the outer peripheral surface of the steel pipe to cool water. an elastic boom that supports the header main body in a cantilever manner, and a balance maintaining device interposed between the elastic boom and the side supports and between the header main body and the floor surface, and the inner cooling header The header body consists of a plurality of guide rollers that come into contact with the inner peripheral surface of the steel pipe at multiple positions to align the center of the header body with the center of the steel pipe, a nozzle that is arranged opposite to the inner peripheral surface of the steel pipe and spouts cooling water, and a header main body that can be separated into one piece. Since the elastic boom is supported and extends in the same direction as the elastic boom of the outer cooling header, the outer cooling header and the inner cooling header can be moved in response to the bending of the steel pipe, and the cooling point can be moved. This has the effect that there is no deviation and the hardenability of the steel pipe can be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional steel pipe hardening device;
The figure is a side view showing particularly the outer cooling header in an embodiment of the steel pipe hardening apparatus according to the present invention, and FIG.
4 is a view taken along line IV-IV in FIG. 3, FIG. 5 is a sectional view showing the return spring device, and FIG. 6 is a side view showing the internal cooling header. , FIG. 7 is a view taken along the line ■-■ in FIG. 6, and FIG. 8 is a partially cross-sectional view taken along the line ■-■ in FIG. 13.34...Elastic boom, 14...
External header body, 15, 36...Nozzle, 21
, 41...Guide roller, 35...Inner header body.

Claims (1)

[Claims] 1. In a steel pipe hardening device comprising an outer surface cooling header that cools the outer surface of the steel pipe and an inner surface cooling header that cools the inner surface of the steel pipe, the outer surface cooling header abuts at multiple positions on the outer circumferential surface of the steel pipe and cools the header body. A plurality of guide rollers whose centers align with the center of the steel pipe, a nozzle that is placed opposite to the outer peripheral surface of the steel pipe and spouts cooling water, an elastic boom that cantilevers the header body, and the elastic boom and side supports. and a balance maintaining device interposed between the header body and the floor surface, and the inner surface cooling header has a plurality of headers that abut the inner circumferential surface of the steel pipe at a plurality of positions to align the center of the header body with the center of the steel pipe. a guide roller, a nozzle disposed opposite to the inner circumferential surface of the steel pipe to eject cooling water, and an elastic boom that supports the header main body in a cantilever manner and extends in the same direction as the elastic boom of the external cooling header. Steel pipe hardening equipment featuring: