JPS608312Y2 - heating furnace - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating furnace, and more particularly to a heating furnace for low-temperature billets such as small brass billets.

Conventionally, a rotary hearth furnace or a rotary kiln furnace has been used as a low-temperature billet heating furnace.

However, rotary hearth furnaces have poor heating efficiency, and rotary kiln furnaces have the disadvantage that the heated material cannot be discharged at equal time intervals.

The purpose of the present invention is to provide a heating furnace that solves the above-mentioned technical problems, has excellent heating efficiency, and is capable of heat-treating objects to be heated at desired time intervals. do.

The present invention includes a heating chamber 3 and a pair of exhaust gas passages 4 and 5 in a furnace body 6.

The heating chamber 3 extends in the transverse direction and has a discharge port 13 that opens downward at the lower part of one end (right side in FIGS. 1 and 2).

The exhaust gas passages 4 and 5 extend along the lateral direction and have one end (
1 and 2) is the other end of the heating chamber 3 (
1 and 2), and are formed parallel to each other at intervals in a direction perpendicular to the lateral direction (vertical direction in FIG. 1).

The guide members 7 and 8 extend in a straight line from the other end of each exhaust gas passage 4 and 5 to near a position above the discharge port 13 in the heating chamber 3.

The guide member 7.8 has a cylindrical cross-section perpendicular to the axis in the exhaust gas passages 4, 5, and has a half-cylindrical shape opened upward in the heating chamber 3.

The first plurality of burners 9 provided in the heating chamber 3 are disposed above the guide members 7 and 8 and spaced from the exhaust gas passages 4 and 5 on one side wall of the heating chamber 3 (the upper side wall in FIG. 1). Exit 1
It is placed near 3.

A second plurality of burners 9, which are larger than the first plurality, are arranged below the guide members 7, 8 on the other side wall of the heating chamber 3 (lower side in FIG. 1), extending from the exhaust gas passages 4, 5 to the discharge port 13. .

In the example, the first plurality is four and the second plurality is six.

The pushing means 10.11 inserts a pushing rod 20.22 into the guide members 7, 8 from the other end on the left side at the other end position of each exhaust gas passage 4.5, and pushes the object to be heated into the guide members 7, 8. Push each inside.

In this pushing means 1o, ii, the pushing rods 20, 22 are driven alternately by cylinders 19,20.

At the other ends of the exhaust gas passages 4 and 5, the exhaust gas is guided upward by a duct 14.

The exhaust gas passage 4.5 and the guide members 7, 8 are connected to the exhaust port 13.
is sloped downwards towards.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the section line ``---'' in FIG.

This heating furnace 1 is used as a heating furnace for a relatively small object 2 to be heated, such as a small brass billet.
is heated and discharged at desired time intervals.

This heating furnace 1 includes a heating chamber 3, a pair of exhaust gas passages 4,
5 and a guide member 7 for guiding the object to be heated 2.
, 8, a plurality of burners 9 provided in the heating chamber 3 of the furnace body 6
, as well as pushing means 10.11 for pushing the object 2 to be heated into the heating chamber 3 along the guide members 7, 8.

The furnace body 6 is formed by lining the inner wall of a casing 12a with a refractory material 12b, and the refractory material 12b defines a heating chamber 3 that extends in the lateral direction.

One end of this heating chamber 3 (right end in Figures 1 and 2)
A discharge port 13 that opens outward is formed at the lower part of the discharge port 13 .

The guide members 7 and 8 penetrate the refractory material 12b on the left side of the furnace body 6 in FIGS. 1 and 2, and extend parallel to each other along the lateral direction.

FIG. 3 is a sectional view taken along the section line ■--■ in FIG. 2, and FIG. 4 is a sectional view taken along the section line IV--IV in FIG.

The guide members 7 and 8 include cylindrical portions 7a and 8a with a cross section perpendicular to the axis at a portion penetrating the refractory material 12b, and an arcuate portion 7b with a downwardly concave cross section perpendicular to the axis within the heating chamber 3.
From 8b onwards.

Such guide members 7 and 8 are formed by cutting off the upper half of a heat-resistant cast steel tube along the axis of a portion corresponding to the arcuate portions 7b and 8b.

The cylindrical portions 7at8a of the guide members 7 and 8 form linear exhaust gas passages 4 and 5 in the furnace body 6 that communicate with the other end of the heating chamber 3.

The guide members 7 and 8 are located at the other end of the furnace body 6 (see FIGS. 1 and 2).
(left end in the figure) to a position above the discharge port 13 in the heating chamber 3.

A duct 14 extending upward is connected to the other end of the furnace body 6, and one ends of the exhaust gas passages 4 and 5 are commonly connected to this duct 14.

In addition, on the side wall of the furnace body 6, there are a plurality of
0 burners 9 are provided, and the heating chamber 3 is heated by burning fuel such as city gas with these burners 9.

The furnace body 6 is fixed on a pedestal 16, and this pedestal 1
One end (the right end in FIG. 1) of 6 is pin-coupled to a base 17 fixed on a horizontal surface.

A jack 18 is provided between the other end of the frame 16 and the base 17.
is interposed, and the pedestal 16 and the furnace body 6 are tilted by the jacks 18 so that the left end in FIG. 1 is located higher than the right end.

Therefore, the guide members 7 and 8 are tilted downward toward the discharge port 13.

The pushing means 10.11 are arranged at the other end (left end in FIG. 1) of the furnace body 6, respectively.

The pushing means 10 includes a pneumatic cylinder 19 and a pushing rod 20 driven by the pneumatic cylinder 19.

The pneumatic cylinder 19 and the press rod 20 have the same axis as the cylindrical portion 7a of the guide member 1, and the press rod 20 can be freely inserted through the duct 14 and into one end of the exhaust gas passage 4.

The pushing means 11 includes a pneumatic cylinder 21 and a pushing rod 22 similarly to the above-mentioned pushing means 10.
can be freely inserted into the exhaust gas passage 5.

Pneumatic cylinder 19.21 of each pushing means 10.11
are driven alternately.

By alternately driving the pneumatic cylinders 19, 21, the press rods 20, 22 are moved back and forth alternately.

On the other hand, the cane heating material 2 is sequentially inserted into one end of the exhaust gas passages 4 and 5, and is pressed by the press rods 20 and 22 so that the guide members 7 and 8 are directed toward the discharge port 13 so that the material to be heated 2 is heated. A portion corresponding to the length is conveyed.

Moreover, the objects to be heated 2 are successively charged into one end portion of the exhaust gas passages 4 and 5.

Therefore, the heated object 2 that moved on the guide members 7 and 8 first
is pressed by the object to be heated 2 newly pressed by the press rods 20 and 22, and therefore the object to be heated 2 is successively pressed on the guide members 7 and 8 and is conveyed toward the discharge port 13.

Therefore, if the amount of forward and backward movement of each press rod 20, 22 in the exhaust gas passage 4.5 is selected to be the same as the length of each object to be heated 2, the object to be heated 2 will be exhausted from the end of the guide member 7.8. The pieces fall into the exit 13 one by one.

Moreover, since the pushing means 10.11 are driven alternately, the objects 2 to be heated alternately fall one by one from each guide member 7, 8 into the discharge port 13.

On the other hand, in the heating chamber 3, the arc portions 7 of the guide members 7, 8
The object to be heated 2 on b, 8b is heated by the combustion heat of the burner 9.

The exhaust gas generated in the heating chamber 3 flows from the other end to one end of each exhaust gas passage 4, 5 in a direction opposite to the moving direction of the object to be heated 2, and is discharged through the duct 14.

Therefore, in each of the exhaust gas passages 4 and 5, the object to be heated 2 is preheated by contact with the exhaust gas.

Moreover, since the flow of the exhaust gas and the moving direction of the object to be heated 2 are countercurrent, the heat exchange efficiency is excellent.

Therefore, each object to be heated is preheated by the exhaust gas in the exhaust gas passages 4 and 5, and then placed in the heating chamber 3 using the burner 15.
After being sufficiently heated, it is discharged from the discharge port 13.

Note that since the guide members 7 and 8 are inclined downward toward the discharge port 13, the object to be heated 2 is smoothly conveyed on the guide members 7 and 8 toward the discharge port 13.

As described above, according to the present invention, the object to be heated is preheated by the exhaust gas and then heated in the heating chamber, so that the combustion heat of the burner is effectively recovered, thereby improving thermal efficiency.

Moreover, since the heated objects are conveyed on the guide member by the pushing operation of the pushing means, the heated objects can be sequentially taken out at desired time intervals.

Particularly, in the present invention, the heating chamber 3 extends in the lateral direction in the furnace body 6, and a pair of exhaust gas passages 4 and 5 are provided in parallel and spaced apart in a direction perpendicular to the lateral direction.

Guide members 7 and 8 extend in a straight line within the exhaust gas passages 4 and 5.

Therefore, the object to be heated can be heated efficiently.

Moreover, in the present invention, the pressing rods 2 of the pushing means 10, 11
0,22 are driven alternately by cylinders 19,20.

Therefore, the objects to be heated 2 fall one by one from each guide member 7, 8 one after another.

This makes it possible to efficiently and orderly discharge the object to be heated.

The guide members 7 and 8 have a cylindrical cross section perpendicular to the axis within the exhaust gas passages 4 and 5, and have a half-cylindrical shape opened upward within the heating chamber 3.

The object to be heated is therefore preheated by the exhaust gas in the exhaust gas passage 4.5 and is heated in the heating furnace 3 by the first plurality of burners and also by the second plurality of burners 9.

The first plurality of burners 9 have guide members 7,
Exhaust gas passages 4 and 5 are provided above 8 and on one side wall of the heating chamber 3.
It is arranged near the discharge port 13 with an interval from the discharge port 13.

Therefore, it is possible to prevent the exhaust gas from the first plurality of burners 9 from flowing directly into the exhaust gas passages 4 and 5, and the object to be heated can be sufficiently heated.

A second plurality of burners 9 is arranged on the other side wall of the heating chamber 3 below the guide members 7, 8 and is located in the exhaust gas passage 4.5.
It is arranged in the heating chamber 3 from the to the discharge port 13.

That is, the second plurality of bars 9 are arranged in the heating chamber 3 up to the vicinity of the exhaust gas passages 4 and 5, and thereby the objects to be heated on the guide members 7 and 8 can be sufficiently heated. Since these second plurality of burners are located below the guide members 7 and 8, high temperature exhaust gas does not flow directly into the exhaust gas passage, and sufficient heat exchange can be performed.

Since the duct 14 is provided in common to the pair of exhaust gas passages 4 and 5, the configuration is simplified.

Since the first plurality of burners 9 are arranged on one side wall of the heating chamber 3 and the second plurality of burners 9 are arranged on the other side wall of the heating chamber 3, a large number of burners 9 are provided facing the heating chamber 3. becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of one embodiment of the present invention, Fig. 2 is a sectional view taken from the section line ■-■ in Fig. 1, and Fig. 3 is a sectional view taken from the section line ■-■ in Fig. 2. 4 is a sectional view taken along the section line IV-TV in FIG. 2. 1...Heating furnace, 2...Heated object, 3.
... Heating chamber, 4, 5 ... Exhaust gas passage, 6
...Furnace body, 7゜8...Guiding member, 9
...Burner, 10, 11... Pushing means.

Claims (1)

[Claims for Utility Model Registration] A heating chamber 3 extending in the lateral direction and having a discharge port 13 opened downward at the bottom of one end thereof, and a heating chamber 3 extending in the lateral direction and having one end at the other end of the heating chamber 3. A furnace body 6 comprising a pair of exhaust gas passages 4.5 formed in parallel with each other and spaced apart in a direction perpendicular to the lateral direction and communicating with the heating chamber from the other end of each exhaust gas passage 4, 5. The exhaust gas passages 4 and 5 have a cylindrical cross section perpendicular to the axis;
In addition, it has a half-cylindrical shape that opens upward in the heating chamber 3, and allows the object to be heated 2 to be slid freely between the guide members 7 and 8. A first plurality of gas passages are disposed on one side wall at a distance from the exhaust gas passages 4 and 5 and close to the discharge port 13, and below the guide members 7 and 8, the first plurality of gas passages extend from the exhaust gas passages 4 and 5 to the discharge port 13 on the other side wall of the heating chamber 3. A burner 9 in which a second plurality larger than the first plurality is arranged, a press rod 20° 22 is inserted into the guide members 7, 8 from the other end of each exhaust gas passage 4, 5, and the object to be heated 2 is guided into the guide member. 7,8
The push rods 20, 22 communicate in common with the other ends of such pushing means 10, 11 and the exhaust gas passages 4, 5, which are driven alternately by cylinders 19, 20, and which direct the exhaust gas upwardly. A heating furnace characterized in that the exhaust gas passages 4 and 5 and the guide members 7 and 8 are inclined downward toward the discharge port 13.