JPS6026125Y2 - Tube heat treatment equipment - Google Patents

Description

[Detailed explanation of the idea] 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, heating and slowly cooling the tubes while keeping their axes horizontal while transporting them. They are difficult to access, require fairly long distances, and therefore require a large amount of space.

In addition, heat loss was also large due to the large space.

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

The present invention solves the above problems by providing multiple furnace chambers on a rotating disk that house the tubes vertically, allowing efficient processing in a small space, and rotating the tubes around the tube axis. The present invention provides a tubular heat treatment apparatus which prevents deformation due to high temperatures during heat treatment.

An embodiment of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a rotary plate, which is rotatably supported on an annular rail 3 by wheels 2 provided at the bottom of the outer periphery. A pinion 6 that is rotationally driven is engaged.

An exhaust pipe is erected at the center of the rotating plate 1, and radial partition walls 8 are arranged around the exhaust pipe.

A plurality of furnace chambers 9 arranged in parallel in the circumferential direction are defined on the rotary plate 1 by the partition wall 8, and each furnace chamber 9 has a tube support for mounting and supporting one end of the tube P in the axial direction. A board is provided.

The tubular body support plate 10 is configured to rotate in conjunction with the rotation of the rotary plate using a planetary gear mechanism or the like, although the details are omitted because it is a known means per se.

Further, a side wall located on the outer periphery of the rotary plate 1 of the furnace chamber 9 is constituted by a door body 11 that can be opened and closed in the radial direction or in the vertical direction.

Further, the upper wall 12 of the furnace chamber 9 is configured to be integral with the partition wall 8 or to be movable up and down, and when configured to be movable up and down, a protrusion 13 that fits into the other end of the tube body P is provided as shown in the figure. This makes it possible to prevent the tubular body 13 from falling over.

Instead of this protrusion 13, a roller for preventing the tubular body P from falling may be provided on the door body.

Furthermore, a burner (not shown) for heating the inside of the furnace chamber is attached to the door body or the upper wall 12, corresponding to each furnace chamber 9.

Next, to explain the operation, the tube P pulled out from the outside centrifugal casting machine is inserted into one furnace chamber 9 on the rotary plate 1 from the tube insertion position on the outer periphery of the rotary plate 1 with the tube axis vertical. and is placed and supported on the tube support plate 10.

Next, the upper wall 12 is lowered and the protrusion 13 is fitted into the other end of the tube P to prevent the tube P from falling over, and the door body 11 is closed to close the furnace chamber 9.

Thereafter, the burner is ignited, and the tube body P is heated to a predetermined temperature while rotating around the tube axis by the rotation of the tube support plate 10 as the rotary plate 1 rotates, and then the heating by the burner is stopped or weakened. Then, the tube P is slowly cooled in the furnace chamber 9 at a predetermined cooling rate.

When the rotary plate 1 has made almost one revolution and the heat treatment of the tube P is completed, the tube P is taken out from the furnace chamber 9, and when the furnace chamber 9 reaches the insertion position of the tube P, a new tube is inserted in the same manner as described above. P is inserted, and the same operation is repeated thereafter.

Further, although the above explanation has been made regarding only one furnace chamber 9, it goes without saying that the same operation is repeated for all furnace chambers 9 in sequence.

Note that the rotary plate 1 may be rotated intermittently by stopping the rotation of the rotary plate 1 when inserting and removing the tube body P into each furnace chamber 9, but since the rotation speed of the rotary plate 1 is small, continuous rotation is possible. You can also perform the above operations while

Further, the tube support plate 10 may be rotated separately from the rotating plate 1 so as to be rotated independently.

According to the tubular body heat treatment apparatus of the present invention, as is clear from the above description, since a plurality of furnace chambers are arranged in parallel in the circumferential direction on the rotating plate, the temperature can be controlled for each furnace chamber. In addition, since the tubes are housed vertically in each furnace chamber and subjected to prescribed heat treatment, the installation space is small, and the heat treatment can be performed continuously, resulting in high processing efficiency.

Furthermore, since the tube is rotated around the tube axis within the furnace chamber during heat treatment, the cylindrical shape of the tube can be reliably maintained regardless of the high temperature treatment.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a partially cutaway plan view in partial section, and FIG. 2 being a front view. 1... Rotating plate, 8... Bulkhead, 9...
...Furnace chamber, 10...Tube support plate, 11...
... Door body, 12 ... Earth wall, 13 ...
Protrusion.

Claims (1)

[Scope of utility model registration request] A plurality of furnace chambers are arranged in parallel in the circumferential direction on a rotary plate, and a tube body support plate is provided for each furnace chamber to rotate in conjunction with the rotary plate and to place and support one end of the tube body in the axial direction. . A tubular body heat treatment apparatus, characterized in that the outer peripheral side wall of each of the furnace chambers is constituted by a door body that can be opened and closed.