JPS5838489B2 - Tube heat treatment equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heat treatment apparatus for pipe bodies such as cast iron pipes.

As a heat treatment for cast iron pipes, there is a method in which a desired ferrite structure is obtained by raising the pipe body to a certain temperature and then slowly cooling it at a predetermined cooling rate.

Conventionally, continuous furnaces have been widely used for this heat treatment, in which the tube is heated and slowly cooled while being transported into the furnace, but this requires a fairly long distance and a large space to slowly cool the tube. do.

Also, because the space was large, heat loss was also large.

On the other hand, batch type furnaces have also been used, but they are inefficient.

The present invention solves the above-mentioned problems and provides a heat treatment apparatus that can perform processing efficiently in a small space.One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a heat treatment furnace having a removable lid 2 and housing a tube body 3 for heat treatment, and the detailed heat treatment furnace 1 is placed on a cart 4.

5a to 5d are rails constituting the first circulation path of the truck 4, and 5c to 5f are rails constituting the second circulation path of the truck 4. A plurality of carts 4 are circulating.

Position P1. of one end of said Ray 1L15b, 5f. P2 is the loading position of the tubular body 3 into the heat treatment furnace 1, and the tubular body 3 immediately after being pulled out from the rotary mold of a centrifugal casting machine (not shown) is transferred on the transfer paths 6a and 6b, and is transferred to the loading position. P, 1 e
P2K It is carried into the heat treatment furnace 1 on the waiting cart 4 in a red-hot state at a carrying position not shown.

Position P3 in the center of the tray #5c is the unloading position of the tube body 3 from the heat treatment furnace 1. At this unloading position, the tube body 3 in the heat treatment furnace 1 is transferred onto the unloading path 7 by an unillustrated unloading device. It will be carried out.

The carry-in position P1. Lid opening/closing devices 8a, sb, and 9 are provided near P2 and unloading position P3, respectively.

The lid opening/closing devices 8 a y 8 b and 9 are composed of elevating cranes, for example, and suspend the lid 2 of the heat treatment furnace 1 on the trolley 4 .

As shown in detail in FIG. 2, the heat treatment furnace 1 is installed on a trolley 4 that moves on rails 5b, 5f, or 5d, and has a furnace chamber 12 surrounded by a heat insulating material 10.11. ing.

Inside the furnace chamber 12, a driving roller 13a and an idle roller 13b are provided.

13c, which are parallel to each other, and two rollers, which are idle rollers 14a and 14b, which are located above the three rollers and support the tube body 3. They are provided at appropriate intervals in the tube axis direction of the tube body 3, and the idle roller 14a is provided on both the drive roller 13a and the idle roller 13b, and the idle roller 14b is provided on both the drive roller 13a and the idle roller i3c. It is in contact with both of them respectively.

Burners 15 and 16 are provided on the lid 2 at appropriate intervals in the axial direction of the tube body 3, one burner 15 mainly heats the tube body 3, and the other burner 16 mainly heats the tube body 3. The idle roller 14b is heated.

Although not shown, the heat treatment furnace 1 also includes a fuel tank for storing fuel for the burners 15 and 16, and a fuel tank in the furnace chamber 1.
A cooling pipe for cooling the inside of the engine 2, a blower for supplying cooling air to the cooling pipe, and the like are installed.

17 is a cart that moves on the rail 5C, and a rail 18 is installed on the cart 11, which is flush with the rails 5b, 5f, and 5d, and as shown in FIG.
The cart 17 places the cart 4 on the rail 18 and moves the saw A.
Move on 15c.

Two carts 17 are placed on the tray 15c, and one similar cart 17 is placed on each of the trays y5a and 5e.

Further, an exhaust hood 19 is attached to the upper end of the lid 2, as shown in FIG.
As shown in the figure, the Ray A15b.

It fits into the exhaust duct 20 disposed above 5f.

Combustion gas in the furnace chamber 12 caused by the burners 15 and 1611C is exhausted to the outside through the exhaust hood 19, exhaust duct 20, and exhaust pipe 21.

Next, the operation will be explained.

The pipe body 3 that has been transferred on the transfer path 6a is at the carry-in position P.
It is carried into the heat treatment furnace 1 on a trolley 4 waiting at 1.

At this time, the lid 2 of the heat treatment furnace 1 is suspended by the lid opening/closing device 8a, and the heat treatment furnace 1 on the cart 4 is in a state without the lid 2.

When the pipe body 3 is completely carried in, the cart 4 moves on the rails 5b and stops at a position below the lid opening/closing device 8a.

At the same time, the lid opening/closing device 8a is lowered, the lid 2 is lowered from the position shown by the imaginary line in FIG. 2, and the lid 2 is placed over the heat treatment furnace 1 as shown by the solid line.

After this, the trolley 4 moves on the rail 5b to the position P4 side,
Move away from the lower position of the lid opening/closing device 8a.

In the furnace chamber 12 of the heat treatment furnace 1 covered with the lid 2, the tube body 3 is supported by idle rollers 14a and 14b, and is rotated around the tube axis in the direction of arrow A by rotation of the first drive roller 13a. It moves me.

At the same time, it is heated by the burner 15 to a predetermined humidity.

Due to this heating, the temperature of the tube body 3 increases and it becomes easily deformed, but since it is rotated around the tube axis as described above,
Ovalization of the tube body 3 is prevented.

On the other hand, the burner 15 heats not only the tubular body 3 but also the idling roller 14a to some extent, and the burner 16 heats the idling roller 14b.

The idling roller 'i4a that directly contacts the tube body 3 in this way,
14b is sufficiently heated, the tube body 3
a.

14b, and a tube body 3 of excellent quality can be obtained.

After a predetermined period of time has elapsed, the fire intensity of the burners 15 and 16 is weakened, and the tube body 3 is maintained at a predetermined temperature lower than before for a predetermined period of time.

Thereafter, the operation of the burners 15 and 16 is stopped, and cooling air is passed through a cooling pipe (not shown) to slowly cool the tube body 3.

At this time, the first drive roller 13a continues to operate, and the tube body 3
Keep rotating in the direction of arrow A.

The heat treatment furnace 1 accommodates the tube body 3 that has thus been heat treated.
The truck 4 carrying the tube moves to position P4 on the rail 5b and transfers to the rail 18 on the truck 17 that is waiting at position P4, but while the tube body 3 is being heat-treated, A cart 4 carrying a heat treatment furnace 1 containing another tube body 3 is sent onto the rail 5b at appropriate intervals, and a plurality of carts 4 are stored on the rail 5b. The tube body 3 will be heat treated.

In addition, burners 15 and 16 generated in the furnace chamber 12 during heat treatment
The combustion gas is exhausted to the outside through the exhaust hood 19, the exhaust duct 20, and the exhaust pipe 21.

The cart 17 carrying the cart 4 moves on the sea/115c and stops at the unloading position P3.

When the truck 17 stops, the truck 4 moves onto the rail 5d, moves on the rail 5C, and stops at a position below the lid opening/closing device 9.

At the same time, the lid opening/closing device 9 is lowered, and the lid 2 of the heat treatment furnace 1 is lowered.
It ascends with a suspended object.

Thereafter, the cart 4 moves on the rail 5d toward the carry-out position P3, and is again placed on the rail 18 on the cart 17.

When the cart 4 is placed on the cart 17 which is stopped at the carry-out position P3, the pipe body 3 inside the heat treatment furnace 1 is discharged onto the discharge path 7 by a carry-out device (not shown) and transferred to a predetermined location.

After this, the trolley 4 moves onto the rail 5d again and moves to the position P
At the same time as stopping at P5, the cart 17 moves on the rail 5c to a position P4.

While the truck 4 is stopped at position P5, the fuel supply device 2
2 (Fig. 1) Fuel is supplied to the burners 15 and 16 from K, after which the trolley 4 moves to a position below the lid opening/closing device 9, and after the lid 2 is placed on the heat treatment furnace 1, It moves on the top and reaches position P6, and is placed on the V-ru 18 on the trolley 17.

The cart 11 carries the cart 4 and moves on the rails 5a, reaching a position below the lid opening/closing device 8a.

After the lid 2 of the heat treatment furnace 1 is suspended by the lid opening/closing device 8a, the cart 4 is transferred onto the rail 5b and reaches the carry-in position P1.

After the cart 4 moves on the rail 5b from the carry-in position P1 to the position P4, the cart 17 moves on the L/-/1/5a to the position P6.

Thus, while each truck 4 circulates through the circulation path, the tube body 3
The materials are transported in, heat treated, and discharged.

In addition, although the above description has described only the first circulation path, the same applies to the second circulation path.

In this way, since the tube body 3 is heat-treated while the truck 4 is being stonged on the circulation path, the installation space can be significantly reduced compared to a conventional continuous furnace.

Also, while the trolley 4 circulates on the circulation route, the pipe body 3 is carried in,
Since the heat treatment and transport are performed, the tube bodies 3 can be continuously processed using a plurality of carts 4 and the heat treatment furnace 1, which is extremely efficient compared to conventional batch type furnaces.

In addition, since the tubes 3 pulled out from the mold can be placed in the heat treatment furnace 1 one after another until the temperature drops, the tubes 3
Saves time and fuel when heating.

FIG. 6 shows a modification of the cart, in which instead of using two types of carts 4 and 17 as in the above embodiment, two types of wheels 23° and 24 whose axial directions are orthogonal to each other in l/c are provided. It is also possible to use the trolley 25.

That is, one wheel 23 resting on the rail 26 shown in FIG. Then, as shown in FIG. 6B, it is placed on v-yvgQ, which is flush with and perpendicular to the tray #26.

At this time, one wheel 23 is lifted from the upper surface of the rail 26.

When using such a trolley 25, the rails 5a to 5
It goes without saying that all f are arranged on the same plane.

In the above embodiment, a set of three rollers 13a,
Although an example in which only one of 13b and '13c is used as a driving roller has been described, two or all rollers may be used as driving rollers.

As explained above, according to the tubular body heat treatment apparatus according to the present invention, since the tubular body is heat treated while the cart is stored on the circulation path, the installation space is reduced compared to a conventional continuous furnace. can be significantly reduced.

In addition, since the tubes are carried in, heat-treated, and taken out while the trolley circulates on the circulation route, the tubes can be processed continuously using multiple trucks and heat treatment furnaces, which is extremely superior to conventional batch-type furnaces. Good efficiency.

Moreover, since the tubes pulled out from the mold can be placed in the heat treatment furnace one after another until their temperature drops, time and fuel can be saved when heating the tubes.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall configuration diagram, FIG. 2 is a vertical side view of a heat treatment furnace, FIG. 3 is a schematic side view of a cart moving under an exhaust duct, and FIG. FIG. 5 is a front view of the truck and heat treatment furnace, and FIGS. 6A and 6B are front views of main parts showing a modified example of the truck. 1... Heat treatment furnace, 2... Lid, 3...
...Pipe body, 4゜25...Dolly, 8at s
b, 9...Lid opening/closing device, Po...Carry-in position, P,...Carry-out position.

Claims (1)

[Claims] 1 A plurality of heat treatment furnaces each having a removable lid and accommodating tube bodies for heat treatment, a position on which the incense roasting treatment furnace is placed, the position of carrying the tubes into the heat treatment furnace, and the tubes from the heat treatment furnace. A tubular body heat treatment method, characterized in that a plurality of trolleys are provided which circulate through the body carrying-out position, and a lid opening/closing device for opening and closing the lid of the heat treatment furnace is provided in the vicinity of the carrying-in position and the carrying-out position, respectively. Device.