JPS583196B2 - Heat treatment furnace sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a heat treatment furnace, and in particular, a sealing device that has heat resistance like asbestos,
A seal roll made of a flexible material is provided, and an air curtain nozzle is arranged behind the seal roll, and the seal roll and nozzle are integrated so as to respond to the loading of the material to be processed and the thickness of the material. The present invention relates to a sealing device for a heat treatment furnace, which is installed so as to be suspended so as to move up and down, and the inside of the furnace is closed by pressing the surface of the material to be treated with the sealing roll and using an air curtain.

A conventional sealing device for a heat treatment furnace is, for example, as shown in FIG. It has a structure in which a plurality of curtains 6 made of stainless steel plates etc. are hung in several stages in the front and back direction above the carrying-in rollers 5, 5 of the processing material W, and these curtains 6... It is set to maintain a predetermined clearance with the surface of the processing material W so as not to damage the surface of the processing material W and to prevent its own wear.

．． Therefore, when the door 3 is opened to carry in the material W to be treated from the inlet 4 as shown in the figure, the N2 inside the heat treatment chamber 7 of the furnace 1 is
Atmospheric gas such as gas leaks to the outside from the clearance between the surface of the carried-in workpiece W and the curtain 6, which is undesirable as it causes heat loss and gas loss inside the furnace.

This is because the outlet section of the furnace is similarly configured, and it would be extremely inconvenient to cause heat loss and gas loss each time the material to be processed W is brought in and taken out. This is inconvenient in terms of utilizing thermal energy and performing effective heat treatment.

Particularly when a continuous heat treatment line for materials to be treated is configured, materials are frequently brought in and taken out, and the above-mentioned disadvantage becomes significant.

Therefore, the present inventor obtained a seal roll by forming a flexible material with excellent heat resistance such as asbestos into a roll shape, and suspended this roll so that it could be raised and lowered so that it was in contact with the loading port inside the furnace entrance. proposed a device that effectively seals the inside and outside of the furnace by raising the seal roll when the material to be carried in enters into this space and pressing it against the surface of the material. According to this device, the sealing performance is improved. It exhibits excellent features such as being superior in quality and not damaging the surface of the treated material.

In the sealing device using the seal roll described above, there is no problem when carrying in and out a material to be processed whose width is equal to the axial length of the inlet and the seal roll, but when a material to be processed whose width is smaller than this is brought in, the problem occurs. A clearance is created between the side edge of the material, the seal roll, and the carry-in roller, and from this the gas in the furnace,
Heat leaks.

The present inventor has created the present invention in order to solve the above-mentioned problems.

The object of the present invention is to increase the versatility of a sealing device using a seal roll that has an extremely excellent sealing effect as described above, and to seal the inside of a furnace using a seal roll even if the material to be treated has a different size. It is an object of the present invention to provide a sealing device that can reliably perform the sealing process and further improve the sealing performance. To provide a sealing device for a heat treatment furnace, which is equipped with an air curtain forming device consisting of a nozzle and can perform effective sealing regardless of the width of a material to be treated.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 shows a heat treatment furnace 10 including a sealing device according to the present invention.
shows a side sectional view of.

11 is a furnace body, 12 is a furnace chamber, and the furnace chamber 12 is provided with shaft-like rollers 13 for conveying the material to be processed W disposed at the same level at a predetermined interval from the entrance. Burners 14... are arranged above and below 13.

A loading chamber 16 is formed between the furnace chamber 12 and the inlet 15 of the furnace body 11, and a door 17 is provided at the back of the loading chamber 16, and a water seal is installed directly below the door 17. 1
8 is provided.

The door 17 is suspended and supported by a beam 19, and a chain 20
, connected to a weight 22 via a pulley 21, and the front and rear hanging pieces 19a, 19b of the beam 19 are water seals 23, 23.
Since the illustration shows the time when the material to be processed W is being carried in, the door 17 is raised to a certain level so as not to come into contact with the roller 130 level and the thickness of the material to be processed W, and then opened. are doing.

In front of the door 17 of the loading room 16, the rollers 13...
A carry-in roller 24 . . . on the same level as .

As shown in FIGS. 3 and 4, the seal roll 25 is made of a disc 26 made of a flexible material with excellent heat resistance such as asbestos, which is formed into a disc shape, and is laminated on a shaft 28 through a hole 27 in the center. The discs 26 are inserted and arranged in parallel to form a roll, and holders 29 and 29 are placed on both axially outer sides of this single disk 26 to regulate the axial direction, thereby forming a seal roll 25 as shown in FIG.
get.

The seal roll 25 is attached as shown in FIGS. 2 and 5.

That is, the seal roll 25 is provided parallel to the roller 24a, and both ends of the shaft 28 are extended to the outside through the long holes 16c in the vertical direction through the left and right walls 16a of the carry-in chamber 16, and the seal roll 25 is placed between the carry-in entrance and above the roller 24a. The extending end 28a of the shaft is rotatably supported by a bearing 30.
is connected to the beam 31 provided on the top wall 16b of the loading chamber 16 by a connecting rod 32 and a chain 33, and the hanging pieces 31a, 31a provided before and after the beam 31 and the left and right hanging pieces 31b are connected to the beam 31 provided on the top wall 16b. It is sealed by immersing it in a water seal 34 provided in the.

The beam 31 is connected to a plumbstone 37 via a chain 35 and a pulley 36, thereby reducing the weight of the seal roll 25 including the beam 31 etc., and easily and smoothly follows and raises and lowers the material W to be processed when it is carried in. It is configured to respond.

A portion including the shaft extending end 28a, the bearing 30, and the lower half of the connecting rod 32 extending outside the wall 16a is covered with a cover 38 provided on the outer surface of the wall 16a, and the shaft 28 is inserted through the elongated hole 16c. Prevent gas leakage in the furnace.

A shielding plate 39 is suspended from the beam 31 on the axis of the sealing roll 25, and the lower end of this shielding plate 39 is not brought into contact with the upper surface of the roll 25, and cover pieces 40, 40 are pivoted and suspended from the lower end in an umbrella shape. The cover pieces 40, 40 are brought into sliding contact with the front and rear of the roll 25, and together with the shielding plate 39, the front and rear of the loading chamber 160 partitioned by the seal roll 25 are blocked off.

Nozzle members 41, 41 are provided at both ends of the seal roll 25 in the axial direction, and the jet nozzle 42 of the nozzle member 41 is shaped like a slit and its tip is bent toward the roll 25. The angle formed with the material to be treated W is 2
A range of 0 to 25 degrees is preferred.

The nozzle member 41 is installed to hang down through a pipe-like connecting member 43 that is fixed to and hangs down from the beam 31 from which the seal roll 25 is suspended, and the connecting member 43 that protrudes above the beam 31
The base portion 43a of the nozzle member 41 is connected to a pressure source such as N2 gas, and gas is supplied to the nozzle member 41 as shown in FIG.

That is, a pipe-shaped horizontal member 44 is integrally connected to the upper end of the nozzle member 41, and this member 44 is connected to a connecting member 43, and the member 44 is provided with a large number of holes 44a. The inside of the nozzle member 41 is communicated with the inside of the nozzle member 41.

The nozzle member 41 described above is provided over an appropriate length on the left and right sides of the seal roll 25, and a slight clearance H is formed between the lower end of the jet port 42 of the nozzle member 41 and the surface of the material W to be carried in to be processed. Set it so that

A fixed nozzle member 45 facing the nozzle member 41 is provided on the left and right sides in the axial direction on the rear side of the carry-in roller 24a, and the slit-shaped ejection port 46 of this member 45 is bent so as to face the ejection port of the nozzle member 41. In addition, a clearance similar to that described above is provided between the spout portion 46 and the back surface of the material to be processed W, and the material is connected to a pressure source such as N2 gas.

In the drawing, reference numeral 47 denotes a driving means such as a chain, sprocket, or motor for driving the carry-in roller 24.

Next, to explain the operation in detail, FIG. 2 shows the time when the material to be processed W is carried in.

The material to be treated W is rolled and sent on conveyance rollers (not shown) and reaches the entrance 15 of the furnace 10. In this case, the external roller group and the roller groups 24 and 13 inside the furnace are driven to rotate at the same speed. ing.

The lower end of the seal roll 25 is lightly pressed and slid into contact with the upper end of the opposing carry-in roller 24a by the action of the weight, and the shaft 28
Even if the door 17 is opened by the roller 25, the shielding plate 39, and the cover piece 40 while rotating, the entrance side communicating with the atmosphere and the door side are effectively shut off.

When the material to be processed W is brought in from the entrance 15, the sealing roll 25 whose tip is lightly pressed against the roller 24a by the action of gravity
, push it up and enter between this space.

The roll 25 is suspended by the action of the weight, when the beam 31 rises, and is lightly pressed against the surface of the material to be processed W by its gravity, and as the material to be processed W is carried in, the roll 25 is suspended. While rotating, the entrance 15 side and the door 17 side in the carry-in chamber 16 are shut off.

Therefore, even if the material W to be processed is carried into the carrying-in chamber 16, the front and back sides of the material W can be effectively blocked by contact with the surface of the block W of the seal roll 25, and a high sealing effect can be obtained.Thickness dimension of the material W to be processed Even if the plate thickness changes, the seal roll 25 is not fixed, but can move up and down as described above, and is in contact with the surface of the workpiece W with a constant light pressure, so it can extremely easily follow and respond even when the plate thickness changes. and performs an effective sealing action.

The above is the axial length of the seal roll 25 and the carry-in roller 2.
4a has been described, but in the case of a processed material having a width smaller than this length, both ends of the outer seal roll 25 on both left and right ends of the material and the carry-in roller 24a are used. A clearance is created between the top and bottom of both ends.

In this case, the slit-shaped jet ports 42 of the nozzle member 4L45 provided above and below both ends. N2 gas or the like is ejected from 46, and the ejected gases collide and merge in the middle of the clearance to form an air curtain.

As a result, the clearances generated on the left and right sides of the narrow material to be processed are sealed, and the inside and outside are shut off, preventing atmospheric gas and heat from leaking inside the furnace.

In the above, since the upper nozzle member 41 is attached to the beam 31, when the roll 25 is placed on the workpiece W and rises, the beam 31 is moved by the action of the vertical weight 37. The nozzle member 41 also rises by the amount of the stroke.
Therefore, is the spout 42 and the surface of the treated material W clear? , and H are always held constant.

Therefore, even if the thickness of the material to be treated changes, it moves up and down integrally with the roll 25, and can always maintain a constant clearance H by following this change.

The above-mentioned nozzle members 41 and 45 are provided over an appropriate axial length, and are determined in consideration of the expected narrowest material to be processed, and the clearance H between the jet nozzle 42 and the material to be processed W is the same as that of the roll 25. Set with consideration for wear.

In addition, since the seal roll 25 is made of a material such as asbestos, it does not damage the surface of the material to be treated W, and the seal roll 25 does not touch the material to be treated by pressing lightly due to the action of the weight. Because of the seal roll. The service life can be improved by minimizing the wear resistance of 25 mm.

Furthermore, the customer seal roll 25 is gradually worn out due to repeated loading of the materials to be processed W, etc., but since it is suspended as described above, it descends as the wear progresses, so the sealing can be performed without any problem until it reaches a predetermined state of wear. In addition, the rolls can be replaced easily by removing the disk units 26 from the shaft 28, and since the seal roll 25 is a laminated body of disk units, molding is also extremely easy.

Although the illustrated embodiment has shown the loading side of the material to be treated, the unloading side is also constructed in the same manner.

According to the present invention as described above, the seal roll is formed of a flexible material with excellent heat resistance such as asbestos, and is suspended above the roller on the conveying side of the material to be treated so as to be able to rise and fall freely. As the material rises in response to the intrusion of the material and is carried into the furnace while pushing the surface of the material, the hot gas inside the furnace is effectively sealed, preventing the leakage of heat and gas generated when the material to be treated is brought in. In addition, nozzle members are provided opposite to each other on both sides of the rolls and the loading port to form an air curtain, so that even if the width of the material to be processed changes, the action of the air curtain remains constant. Therefore, the sealing effect can be effectively achieved regardless of the width of the material to be processed, and it is extremely effective in heat treatment, making it an excellent sealing device for continuous heat treatment.

Further, according to the present invention, the ten nozzle members forming the air curtain can be moved up and down integrally with the seal roll, so that a constant clearance with the surface of the material to be treated is always maintained and In addition to being able to perform the best sealing according to the width as described above, since the seal roll is made of the above material, there is no damage to the surface of the material to be treated.
In addition to effectively protecting the processed material while sealing effectively, even if the seal roll wears out, it follows this wear and ensures the sealing action.In addition to being excellent in sealing effect in this respect, the seal roll is also By adopting a laminated body of single disks as shown in the example, it is easy to mold and can be easily obtained, and the structure of the sealing device is also relatively simple, making it highly versatile as it can be applied to various types of furnaces. It exhibits various features and is extremely practical.

Brief explanation of the drawings ゛Figure 1 is a side sectional view showing an example of a conventional sealing device, Figure 2 is a side sectional view showing an example of a conventional sealing device.
The figure is a side cross-sectional view of a heat treatment furnace that employs the sealing device according to the present invention, Figure 3 is a front view of the seal roll, Figure 4 is a perspective view of the seal roll constituent members, and Figure 5 is a view of the sealing device. FIG. 6 is an enlarged side view of the seal roll and nozzle member, and FIG. 7 is a cutaway perspective view of the nozzle member.

In the drawing, 10 is a furnace, 24 is a roller, 25 is a seal roll, 41.45 is a nozzle member, and W is a material to be treated.

Claims (1)

[Claims] 1. A seal roll made of a material with excellent heat resistance and flexibility, such as asbestos, is suspended so as to be able to move up and down, so as to press against the roller on the loading side of the material to be treated in the furnace. The sealing roll is raised by the material being carried between the rollers, and the sealing roll is brought into contact with the surface of the material to seal the surface of the material. A sealing device for a heat treatment furnace, characterized in that an air curtain nozzle member that moves up and down integrally therewith is provided, and a nozzle member facing the nozzle member is provided behind the roller facing the seal roll.