JPS58680Y2 - Heating furnace induction groove cover device - Google Patents

Description

[Detailed description of the invention] This invention relates to a heating furnace used for heat treatment to decompose the white pig iron structure of spheroidal graphite cast iron pipes manufactured by centrifugal force casting, and in particular to a cover device for the guide groove of the feed claw. .

A heating furnace implementing this idea has a plurality of guide grooves formed in parallel on the hearth, and feeding claws attached at regular intervals on the outside of an endless chino placed below each guide groove are placed above the hearth through the guide grooves. The objects to be heated, such as cast iron pipes, which are protruded and lined up on the hearth are pushed by the feeding claws, thereby heating the objects while rolling them.

In the case of such a heating furnace, the part between the feed claws in the guide groove becomes an opening, and this opening communicates with the lower part of the hearth, so the heat in the furnace is dissipated from this opening during heat treatment. be done.

For this reason, in the case of heat treatment of cast iron pipes, there is a drawback that as-cast structures remain in the part of the cast iron pipes facing this opening.

One way to compensate for these drawbacks is to raise the temperature of the furnace atmosphere, but if you raise the atmosphere temperature and make the furnace temperature higher than necessary, this heat will be transmitted to the lower part of the hearth, causing damage to the endless chinos, sprockets, etc. This poses a problem as it can cause failures in the drive parts.

In order to solve the above-mentioned problems, this invention provides a cover device that closes the opening formed in the guide groove.

Next, details of this invention will be explained based on the attached drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a furnace body of a heating furnace, with an inlet at the right end of the figure and an outlet at the left end, each provided with a flexible heat insulating cover 2.

Reference numeral 3 denotes a hearth in the lower part of the furnace body 1, on which a plurality of (two in the figure) guide grooves 4 are formed in parallel.

Reference numeral 5 denotes a rail provided on the upper surface of the hearth 3, which is provided on the outside of each guide groove 4, divided into a plurality of sections, and arranged diagonally so that the object to be heated 6 such as a cast iron pipe on this rail 5 and the rail 5 are This is so that the contact area is not limited.

7.8 is a rotating shaft arranged at the lower part of the hearth 3. A pair of left and right sprockets 9 and 10 are fixed to each of the rotating shafts 7 and 8, respectively. Hang the folded parts on both ends.

Every other link 11 of this endless chino A has a feeding claw 1.
2 are fixed facing outward, and cover members 14 are respectively fixed to the links 13 between the links 11.

This cover member 14 is made of a fireproof material such as ceramic fiber, and is fixed on a plurality of bolts 15 fixed to the frame 17 outside the link 13, and this cover member 14 protrudes onto the guide groove 4. Although it covers the guide groove 4,
The upper surface of the cover member 14 is slightly lower than the upper surface of the rail 5.

The hearth 3 is extended outward from the furnace body 1, and rails 16 are provided in this extended portion in parallel to the left and right sides.

This device has the above-mentioned structure, and the object to be heated 6, such as a cast iron pipe, rolls on the right rail 16 in FIGS. It enters the furnace body 1 while pushing open the heat insulation cover 2 by being pushed by the feed claw 12 that comes out.

Inside the furnace body 1, each object to be heated 6 is pushed by a feed pawl 12, and while it rolls and moves toward the exit with the chino A, it is heated by a burner installed on the side wall of the furnace body 1, etc., and undergoes heat treatment. and exit through the exit.

The heating furnace in which this invention is implemented performs heat treatment while the object to be heated 6 passes through the furnace body 1 at a constant speed by the feeding claws 12 as described above. 4 is covered by the feed claw 12 and the cover member 14, so there is only a small gap between the feed claw 12, the cover member 14, and the guide groove 4, and the inside of the furnace from this part is heat dissipation is almost eliminated.

Therefore, there is no local structure remaining due to a local temperature drop in the object to be heated 6, and uniform heat treatment can be performed.Therefore, there is almost no need to perform reheat treatment due to poor heat treatment. It is also possible to shorten the pre-combustion time required to raise the temperature inside the engine, and also to eliminate failures due to overheating of the endless chain (A), sprocket (9.10) and its drive mechanism.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted vertical cross-sectional side view of a heating furnace in which this invention was implemented, and Fig. 2 is a cross-sectional plan view of the same partially omitted.
FIG. 3 is a partially cutaway enlarged perspective view of the main part. 1... Furnace body, 3... Hearth, 4...
...Induction groove, 6...Heated object, 12...
・Feeding claw, 14...Cover part, A...
・Endless chino for transportation.

Claims (1)

[Scope of utility model registration request] A plurality of guide grooves are provided in parallel on the hearth of the heating furnace, and feed pawls attached at appropriate intervals to the outside of the endless conveyor chino provided at the bottom of the hearth protrude from the guide grooves onto the hearth. In a heating furnace configured to push an object to be heated, a frame is provided on the outside of the nonta between each feed pawl of the chino, and a frame is provided on the outside of each of the nonta to cover the space of the guide groove generated between each feed pawl. A heating furnace induction groove cover device with a cover part attached.