JPH0334636Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sealing device for a mesh belt furnace.

(Prior Art) Conventionally, a mesh belt furnace generally has a structure in which a part of an endless mesh belt 6 is placed in a furnace 1 from a material charging port 2, as shown in FIG. The processed material is transferred to furnace 1.
The material is loaded into the furnace, subjected to a predetermined heat treatment while being transported through the furnace, and then extracted from the extraction port to the outside of the furnace using an in-furnace reversing roll (not shown).

On the other hand, the inward belt 6b that has been reversed by the in-furnace reversing roll passes below the outgoing belt 6a to reach the outside of the furnace. Note that 7 is a support roll for the mesh belt.

(Problems to be Solved by the Invention) As described above, since the forward and return paths of the mesh belt are located at the material charging port, the opening of the charging port is larger than the size required for material charging.

Therefore, in mesh belt furnaces, the presence of this large charging port causes the atmosphere inside and outside the furnace to flow in and out, which not only disturbs the furnace atmosphere but also requires a large amount of furnace atmosphere gas.

The present invention has been made to solve the above problems.

(Means to Solve the Problems) In order to achieve the above object, the sealing device for the mesh belt furnace according to the present invention includes a sealing box having a built-in reversing roll outside the furnace for reversing the returning belt at the lower part of the material charging port. At the same time, a water seal tank is provided below the seal box, which is equipped with a water seal roll around which the belt from the reversing roll is wound, and whose lower end is immersed in the water seal liquid, while one end is connected to the seal box. The hollow communicating member has a lower end connected to the water sealing tank via a water sealing means, an exhaust means on the belt conveying path formed inside, and a water cooling jacket on the outer periphery. be.

(Example) Next, the present invention will be explained with reference to the drawings which are one example.

FIG. 1 schematically shows a mesh belt furnace equipped with a sealing device according to the present invention, and the same parts as in FIG. 5 are given the same reference numerals. In addition, 3 is an extraction port, 4 is a radiant tube which is a material heating means, 5 is an in-furnace reversing roll provided in the furnace 1, and 10 is a sealing device according to the present invention.

As shown in FIGS. 2 and 3, the sealing device 10 roughly consists of a seal box 11 provided at the bottom of the charging port 2, a water seal tank 14, and a hollow communication member 17 that connects the two. .

The seal box 11 is provided at the lower part of the charging port 2, and its upper surface is connected to the outgoing belt 6.
It is located as high as possible without contacting the lower surface of the loading port 2, and closes the lower part of the outgoing belt 6b of the loading port 2.
Further, an outside reversing roll 13 is built into the seal box 11. 12 is an opening for belt passage.

The water seal tank 14 is located below the seal box 11, and is provided with a water seal roll 15 with at least its lower part immersed in the water seal liquid W.

Further, the hollow communication member 17 has a hollow communication member main body 18, the upper end of which communicates with the lower surface of the seal box 11, and the lower end of which is in sliding contact with the sealing material 1 in the axial direction of the surface of the water seal roll 15.
9 and a sealing material 20 that is in sliding contact with both circumferential surfaces of the water sealing roll 15, the hollow communicating member main body 1 having the sealing materials 19, 20 and a part of the lower end immersed in the water sealing liquid W.
8 to block the intrusion of outside air. Further, a water cooling jacket 21 is provided on the central outer periphery of the hollow communication member main body 18, and a water cooling jacket 2
1 is provided with an exhaust device 23 consisting of an ejector provided to cover an exhaust opening 22 provided in the hollow communication member main body 18.

The cooling water supply pipe P to the water cooling jacket 21 is branched, and the branch pipe _P1 is connected to the water supply header 16 which is open on the inner surface of the hollow communication member main body 18 and near the water surface of the water sealing liquid W. Connected.

Next, the operation of the sealing device constructed as described above will be explained.

As mentioned above, the opening area of the charging port 2 is reduced compared to the conventional one due to the presence of the seal box 11, so that the atmosphere in the furnace is not significantly disturbed.

The high-temperature mesh belt 6 that passes through the reversing roll 13 outside the furnace and reaches the water seal roll 15 is cooled by a water-cooling jacket 21 on the way and is immersed in the water seal liquid W, and then its direction is changed by the water seal roll 15 and then transferred to the water seal roll 15 inside the furnace. cycle.

By the way, when the mesh belt 6 is immersed in the water sealing liquid W, water vapor is generated, and this water vapor is forcibly exhausted by the exhaust device 23 and removed from the seal box 1
No intrusion into the furnace from 1.

Note that the exhaust device 23 may be additionally provided at the lower part of the seal box 11 or the hollow communication member main body 18 to more reliably exhaust the air.

Further, as in the embodiment, if water is supplied to the water sealing liquid W near the water surface where the mesh belt 6 enters the water sealing liquid W, the liquid temperature in this area will not increase much, and the water to the hollow communication member 17 will increase accordingly. Intrusion water vapor can be reduced.

Note that the hollow communication member 17 has a sealing material 19,
20, as shown in FIG. 4, the water seal roll 15 is immersed in the water seal liquid W, and the lower end of the hollow communication member main body 18 is immersed in the water seal liquid W to form the hollow communication member. Although the main body 18 may also be used, as in the embodiment, if a part of the water seal roll 15 is shallowly immersed in the water seal liquid W to shorten the time the mesh belt 6 is in the liquid, the mesh belt 6 can be used as the water seal liquid W. After leaving the furnace, it dries naturally due to its retained heat, making it possible to prevent water droplets from being carried into the furnace without using any drying means.

(Effects of the invention) As is clear from the above explanation, according to the invention, the opening of the material charging port through which the mesh belt passes, except for the part necessary for material supply, is closed with a seal box. There is little movement of the atmosphere inside and outside the furnace, so the atmosphere inside the furnace is not disturbed significantly, and the consumption of atmospheric gas can be reduced.

Moreover, since the high-temperature mesh belt is cooled by a water-cooled jacket and sealed from the outside air by a water-sealing liquid, little water vapor is generated, and this water vapor is removed by the exhaust means, so that the water vapor passes through the seal box and enters the furnace. Intrusion into the interior is also completely prevented. Furthermore, since less water vapor is generated, the exhaust means is also small and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a mesh belt furnace equipped with a sealing device according to the present invention, Fig. 2 is an enlarged view of the sealing device part in Fig. 1, and Fig. 3 is a diagram showing a water seal roll and a sealing plate of a hollow communication member. An explanatory diagram showing the relationship between
FIG. 4 is a diagram showing another embodiment of the water seal tank, and FIG. 5 is a sectional view of the main parts of a conventional mesh belt furnace. 2...Material loading port, 6...Mesh belt, 1
1...Seal box, 13...Reverse roll, 1
4... Water seal tank, 15... Water seal roll, 17... Hollow communication member, 21... Water cooling jacket, 23...
Exhaust means.

Claims (1)

[Scope of utility model registration request] In a sealing device for a mesh belt furnace, in which a part of an endless mesh belt is placed in the furnace from a material charging port, a seal box is provided at the bottom of the material charging port, and includes a built-in reversing roll outside the furnace for reversing the returning belt. , a water seal tank is provided below the seal box, and is provided with a water seal roll around which the belt from the reversing roll is wound, and at least the lower end is immersed in the water seal liquid, while the upper end communicates with the seal box. A sealing device for a mesh belt furnace, characterized in that the lower end reaches a water sealing tank, a hollow communication member is provided with an exhaust means in a belt conveyance path formed inside, and a water cooling jacket is provided on the outer periphery of the hollow communication member.