JPS5835645Y2 - Steel pipe heat treatment equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a steel pipe heat treatment apparatus for heat treating a steel pipe using a heater and a cooler, and particularly relates to a steel pipe heat treatment apparatus suitable for uniformly heat treating the entire length of the steel pipe.

Generally, when a steel pipe is heat treated using an induction heater and a cooler, the heating and cooling conditions at the ends of the steel pipe tend to be uneven.

Therefore, in conventional steel pipe heat treatment equipment, heating aids are manually attached to both ends of the steel pipe to be heat treated to equalize the heat treatment conditions over the entire length of the steel pipe.

However, since the heating aid is attached and removed manually, there is a drawback that work efficiency is low.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and it mechanizes the work of attaching and detaching auxiliary tools to the ends of steel pipes, making it possible to obtain high-quality heat-treated steel pipes with high work efficiency. The purpose is to provide a heat treatment device.

This invention consists of a plurality of rollers for conveying the steel pipes to be processed, each of which is disposed so that its axis intersects with the steel pipe passing direction, a steel pipe heating system disposed close to the steel pipe passing line on the rollers, A heater and a cooler for cooling, a guide rail extending in the direction of the steel pipe passing line at a position above the line, and a hanger suspended on the guide rail and movable along the guide rail; a dummy pipe oriented in accordance with the line and rotatably supported with respect to the hanger;
The main points are as follows.

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

FIGS. 1 and 2 are explanatory diagrams showing an embodiment of the steel pipe heat treatment apparatus according to the invention.

The steel pipe 1 is sent from the entry side fixed skid 2 to the transport rollers 4 on the heat treatment line by the kick-in device 3.

The steel pipe 1 is quenched and tempered as described below while being spirally moved on a heat treatment line by a conveying roller 4, and then sent out to an exit fixed skid 6 by a kickout device 5. .

On the heat treatment line, a heater 7 into which the steel pipe 1 is inserted and an outer surface cooler 8 are arranged adjacent to each other, and an inner surface cooler 9 which cools the inner surface side of the steel pipe 1 is arranged inside the outer surface cooler 8. ing.

The inner cooler 9 is fixed to a stand 11 via a support boom 10, and a support roller 12 is provided on the support boom 10 near the inner cooler 9.

The support rollers 12 are elastically supported while being urged outward in the radial direction, and are adapted to support the inner surface cooler 9 by coming into rolling contact with the inner surface of the steel pipe 1 inserted therethrough.

A right dummy pipe 13 and a left dummy pipe 14 are arranged on the left and right sides of the heat treatment line.

Each dummy pipe 13, 14 has the same cross-sectional shape as the steel pipe 1 to be heat treated, and is provided at its tip with a drawing part 15 into which the inner diameter end of the steel pipe 1 is inserted and connected under pressure.

Each dummy pipe 13, 14 is supported by a hanger 16 and rotates in synchronization with the steel pipe 1.

The hanger 16 is movable via wheels 17 along a guide rail 18 provided on the heat treatment line.

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

First, as shown in FIG. 3A, the right dummy pipe 13
The intake portion 15 is disposed protruding from the inlet side of the heater 7, and the steel pipe 1 is carried onto the heat treatment line.

Next, the steel pipe 1 is spirally moved to the right by the drive of the conveyor roller 4, and as shown in FIG. Connect the left dummy pipe 14 to the guide rail 18
Move along the left side dummy pipe 1 to the left end of steel pipe 1.
Connect 4.

In this way, with the right dummy pipe 13 and the left dummy pipe 14 integrally connected to both ends of the steel pipe 1, the steel pipe 1, the right dummy pipe 13, and the left dummy pipe 14 are moved rightward at a predetermined moving speed. While moving,
The portion heated by the heater 7 is rapidly cooled by the outer cooler 8 and the inner cooler 9 to perform a hardening operation.

Here, the right end of the steel pipe 1 is quenched under the same heat treatment conditions as the middle part of the steel pipe 1 at the stage when the steel pipe 1 is transferred from FIG. 3B to FIG. 3C.

Further, the left end portion of the steel pipe 1 is quenched under the same heat treatment conditions as the middle portion of the steel pipe 1 at the stage where the steel pipe 1 is transferred from the third drawing to the third drawing E.

After the hardening work over the entire length of the steel pipe 1 is completed in this way, the operation of the external cooler 8 and the internal cooler 9 is stopped, and the steel pipe 1, the right dummy pipe 13, and the left dummy pipe 14 are removed as shown in FIG. 3E. The steel pipe 1 is moved from the position shown in FIG.

In this tempering process as well, the left end of the steel pipe 1 is tempered under the same heating conditions as the middle part of the steel pipe 1 at the stage where the steel pipe 1 transitions from Figure 3 E to Figure 3. The right end part of the steel pipe 1 is tempered under the same heating conditions as the middle part of the steel pipe 1 at the stage where the steel pipe 1 transitions from FIG. 3C to FIG. 3B.

According to the above embodiment, guide rails 1 are attached to both ends of the steel pipe 1 carried into the heat treatment line via hangers 16.
A right side dummy pipe 13 and a left side dummy pipe 14 which are movable in the axial direction on the steel pipe 1 are mechanically press-connected, and the steel pipe 1 has respective dummy pipes 13 and 14 at both ends thereof.
is heat treated in the longitudinal direction in an apparently integral and continuous state, and is therefore also secured at the ends of the steel pipe 1.

In addition, the right dummy pipe 13 and the left dummy pipe 1
4 is mechanically connected to both ends of the steel pipe 1 under pressure, improving work efficiency and connecting the intake portion 15 and the steel pipe 1 provided in each dummy pipe 13 and 14.
The dummy pipes 13 and 14 do not separate from the steel pipe 1 even if the fitting accuracy is not high. FIG. 4 is an explanatory diagram showing another embodiment of the steel pipe heat treatment apparatus according to this invention. be.

This embodiment has a combustion line 21 and a tempering line 22.
and are placed on different lines,
This idea is applied.

Steel pipes to be heat treated are carried from the entry side fixed skid 23 to the transport rollers 25 of the quenching line 21 by a kick-in device 24.

The quenching line 21 is equipped with a heater 26 and an external cooler 27.
is fixed in place.

The inner surface cooler 28 is attached to a truck 30 via a support boom 29, and the truck 30 is movable in the line direction of the quenching line 21.

Further, on the left and right sides of the quenching line 21, a right dummy pipe 31 and a left dummy pipe 32 similar to those in the previous embodiment are arranged so as to be movable in the line direction along a guide rail.

On the exit side of the quenching line 21, a kickout device 33 and one end side of a drain skid 34 are disposed.

The other end side of the draining skid 34 faces the tempering line 22, and the tempering line 22 is provided with a kick-in device 35, a conveyance roller 36, a heater 37, and a kick-out device 38, and the kick-out device ff138 is used for heat treatment. The completed steel pipe is conveyed to a cooling skid 39.

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

The inner cooler 28 is moved to the outer cooler 29 by driving the trolley 30.
The steel pipe to be heat treated is carried onto the conveying roller 25 with the end of the right dummy pipe 31 protruding from the inlet side of the heater 26.

The steel pipe is moved rightward on the conveying roller 25 and its right end is connected to the right dummy pipe 31, and the left dummy pipe 32 is moved to connect the left dummy pipe 32 to the left end of the steel pipe.

Steel pipes integrally connected to each other, right dummy pipe 31
Then, the left dummy pipe 32 is moved to the right, and the entire length of the steel pipe is quenched under uniform heat treatment conditions by the action of the heater 26, the external cooler 27, and the internal cooler 28.

When this hardening is completed, the truck 30 is driven again to return the inner cooler 28 to its original position as shown in FIG.

The steel pipe that has been quenched in this way is carried out to a draining skid 34 by a kick-out device 33, and further carried to a conveying roller 36 of a tempering line 22 by a kick-in device 35.

Driven by the transport rollers 36, the steel pipe is passed through the heater 37 and tempered, and then transferred to the kickout device 3.
8 to the cooling skid 39.

According to the above embodiment, the internal cooler generator 28 is connected to the quenching line 2.
Since it is movable in the direction of line 1, quenching line 2
Even when the tempering line 1 and the tempering line 22 are arranged on different lines, it is possible to convey the hardened steel pipe to the tempering line with high efficiency.

In addition, in the fuel line 21, the right dummy pipe 31 and the left dummy pipe 32 are press-connected to both ends of the steel pipe, so as in the previous embodiment,
Each dummy pipe 31.3 at both ends of steel pipe with high work efficiency
2 can be attached and detached to equalize the hardening accuracy of the steel pipe.

As described above, the steel pipe heat treatment apparatus according to the present invention includes a dummy pipe that is movable in the axial direction along the guide rail, and heat-treats the steel pipe with the dummy pipe press-connected to both ends of the steel pipe. Therefore, the work of attaching and detaching the auxiliary tool to the end of the steel pipe is mechanized, and it is possible to obtain a heat-treated steel pipe of high quality with high work efficiency.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the steel pipe heat treatment apparatus according to this invention, Fig. 2 is an enlarged cross-sectional view of the same main part, and Figs. The sectional view shown in FIG. 4 is a plan view showing an embodiment of assimilation. 1... Steel pipe, 7, 26... Heater, 8
, 27... External cooler, 9, 28...
Internal cooler, 13.31...Right side dummy pipe, 14.32...Left side dummy pipe, 18...
...Guide rail.

Claims (1)

[Scope of utility model registration request] A plurality of rollers for conveying the steel pipe to be processed, each of which is arranged with its axis intersecting the steel pipe passing direction, and a heater for heating and cooling the steel pipe arranged close to the steel pipe passing line on the rollers. a guide rail extending in the direction of the steel pipe passage line at a position above the line;
A steel pipe comprising: a hanger suspended on the guide rail and movable along the guide rail; and a dummy pipe oriented along the line and rotatably supported with respect to the hanger. heat treatment equipment.