JPH0317492A - Seal structure of hearth lift type batch furnace - Google Patents

Abstract

PURPOSE:To prevent damage and wear from occurring in a hearth lift type structure, and to have high durability so as to obtain a maintenance-free seal structure by allowing the structure to lift a hearth support stand up to a specified position with the use of a lift means to energize a hearth toward a furnace body with the use of a furnace energization means. CONSTITUTION:When a hearth support stand 21 is allowed to lift with the use of the action of a lift means and a hearth 3 reaches the neighborhood of the lower opening of a furnace body 1, a hearth support stand stops. An air cylinder 26 of a hearth energization means 22 is allowed to energize its piston rod 26a with the use of air pressure to rotate a lever 25 by making a fulcrum of a support shaft 24. Thereby, a hearth 3 supported at the other end of the lever 25 is allowed to energize toward the furnace body 1 to insert the edge of a seal plate 2 of the furnace body 1 in a groove 5 of a seal ring member 4 to eat into a seal material 6 of the groove 5 so as to seal in the furnace body 1. Since a seal plate 2 does not come into contact with the seal plate 6 in a process in which the hearth support stand 21 is allowed to lift up to an upper limit position, wear of a screw shaft 8a is prevented. Since the lever 25 is arranged at approximately regular angle intervals over the hearth support stand 21, super sealing can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sealing structure for a hearth-lifting batch furnace in which the hearth is raised and lowered relative to the furnace body to take in and take out the materials to be fired into the furnace body.

[Prior Art] Generally, in a batch furnace, a predetermined gas is introduced into the furnace body, and the object to be burned is burned in this gas atmosphere.

BACKGROUND ART Batch furnaces of this type have heretofore been divided into two types: one with an opening/closing door, and the other with an elevating hearth, depending on how the material to be burnt is taken in and out of the furnace body. In order to maintain the atmosphere inside the furnace body in a predetermined state, a seal is placed between the furnace body and the door in the case of a door opening/closing type, and a seal is placed between the furnace body and the hearth in a case of a raising/lowering type hearth. Ru.

FIG. 4 shows an example of this type of hearth-lifting batch furnace.

The hearth lifting type batch furnace is provided with a sealing plate 2 on the furnace body 1 side, a sealing member 4 on the hearth 3 side of the furnace body 1, and a sealing ring member 4 having a shape. The tip of the sealing plate 2 is inserted into the sealing material 6 in the groove 5, thereby sealing the space between the furnace body l and the hearth 3.

The seal plate 2 surrounds the lower opening 07 of the furnace body 1 and protrudes from the end face of the lower opening 7 of the furnace body l.

On the other hand, the sealing ring member 4 is fixed to the hearth 3 side facing the tip of the sealing plate 2. The sealing ring member 4 has a ring-shaped groove 5 for receiving the seal plate 2, and the sealing material 6 made of an elastic material such as silicone rubber is accommodated in the groove 5.

The furnace body l is supported by a furnace body support frame 8. The furnace body support 7 frame 8 is provided with a screw jack 9 for raising and lowering the hearth 3 with respect to the opening 7 of the furnace body l. This screw jack 9 is screwed into a motor that rotationally drives the worm 9a, and the worm 9a that is rotationally driven by a motor 12, rotates with the rotation of the rotating worm wheel 9b1, and is screwed onto the screw shaft 8a. and a worm gear 9c that raises and lowers the hearth 3 while moving the hearth 3, and these are housed in a gearbox l3.

When the worm gear 9c is rotationally driven by the motor 12 in the direction shown by arrow A, the hearth 3 rotates until the seal plate 2 bites into the seal material 6 in the sealing ring member 4 as shown by arrow A2. Rise. Further, when the worm gear 9C is rotationally driven in the direction shown by the arrow A3 by the motor l2, the hearth 3 is lowered as shown by the arrow A. Thereby, the object to be fired 14 placed on the hearth 3 can be taken in and out of the furnace body l.

[Problems to be Solved by the Invention] By the way, in the hearth lifting type batch furnace having the above structure, when the hearth 3 is raised, the tip of the sealing plate 2 touches the sealing material 6 in the sealing ring member 4. Since the hearth 3 is raised until it bites in, a large force is applied to the worm gear 9C of the screw jack 9 when the tip of the seal plate 2 bites into the sealing material 6 in the sealing ring member 4 (12). Therefore, there was a problem that the worm gear 9cll was worn out.

The object of the present invention is to provide a highly durable and maintenance-free hearth lifting system that does not cause damage or wear to the mechanism that raises and lowers the hearth when raising and lowering the hearth to seal the inside of the furnace body. The purpose of the present invention is to provide a sealing structure for a batch furnace.

[Means for Solving the Problems] Therefore, the present invention provides a seal plate that is provided on the furnace body side, surrounds the opening in the lower part of the furnace body, and projects from the opening end surface of the furnace body, and a seal plate that is opposite to the tip of the seal plate. and has a ring-shaped groove fixed to the hearth side to receive the seal plate,
and a sealing ring member in which a sealing material made of an elastic material is housed in the groove, the hearth is biased toward the furnace body, and the sealing plate is applied to the sealing material of the sealing ring member. In a hearth lifting type batch furnace where the tip of the hearth is bitten to seal the inside of the furnace body, the hearth support table that supports the hearth and the lifting and lowering of the hearth support table that raises and lowers the hearth support table. and a hearth biasing means disposed between the hearth and the hearth support for uniformly biasing the lower surface of the hearth toward the furnace body; The present invention is characterized in that after the support base is raised to a certain position, the hearth is urged toward the furnace body by the hearth urging means.

[Function] The hearth support is raised by the action of the lifting means. When the hearth supported on the hearth support reaches near the lower opening of the furnace body, the hearth support stops, and the hearth biasing means acts to move the hearth toward the furnace body. energize. As a result, the tip of the sealing plate bites into the sealing material of the sealing ring member, sealing the inside of the furnace body.

[Effects of the Invention] According to the present invention, when the hearth is raised and the inside of the furnace body is sealed, the hearth support stops before the tip of the sealing plate bites into the sealing material of the sealing ring member. Therefore, a large load is not placed on the elevating means of the hearth support, and there is no damage or wear to the elevating means, increasing the durability of the hearth elevating type batch furnace, and the hearth elevating type is maintenance-free. Batch furnaces can be obtained.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

A hearth lifting type batch furnace to which the present invention is applied is shown in FIG.

The hearth lifting type batch furnace described above is the hearth lifting type batch furnace shown in FIG. Screw jack 9' as a means of raising and lowering as shown in
and arranged between the hearth 3 and the hearth support 2l,
It is equipped with a hearth biasing stage 22 for biasing the hearth 3 toward the furnace zero body l, and parts corresponding to those in FIG. 4 are shown with corresponding symbols, Duplicate explanations will be omitted.

The hearth support 2l is screwed onto the screw shaft 8a via a gear 9c of a screw jack 9'. Then, the hearth support 2l rises as shown by the arrow A as the worm gear 9c rotates in the direction shown by the arrow A, and as the worm gear 90 rotates in the direction shown by the arrow A, the hearth support 2l rises as shown by the arrow A. It descends as shown in . The screw jack 9' is the screw jack 9 that lifts and lowers the hearth 3 in the hearth lifting type batch furnace explained in FIG.
It has a similar configuration.

On the other hand, the hearth biasing means 22 is a lever that is swingably supported at the tips of support columns 23 that are protruded at equal angular intervals around the center of the disk-shaped hearth support 2l. 25, and an air cylinder 26 to which one end of each lever 25 is connected.

Each of the levers 25 is bent toward the hearth 3 in the middle, and is swingably supported at the bent portion by a support shaft 24 provided at the tip of the support column 23.

The hearth 3 is supported at the other end of each of the levers 25. A plan view of the hearth support 2l including the hearth urging means 22 is shown in FIG.

The air cylinder 26 of the hearth biasing means 22 uses air pressure to move its piston rod 26a in the direction indicated by the arrow A. The lever 25 is biased as shown by arrow A14 to rotate the lever 25 about the support shaft 24 as a fulcrum. As a result, the hearth 3 supported by the other end of the lever 25 is urged toward the furnace body 1 as shown by arrow A1B, and the tip of the sealing plate 2 of the furnace body l is pushed toward the sealing ring member 4. It enters the groove 5 and bites into the sealing material 6 in the groove 5, sealing the inside of the furnace 1.

The air cylinder 26 of the hearth biasing means 21 performs the above operation after the hearth support 2l rises to a preset upper limit position and stops. The above-mentioned position of the hearth support 2l is detected by the upper limit detector 27 shown in FIG. 1, and the hearth support 2l is stopped at the above-mentioned upper limit position.

Similarly, the lower limit position of the hearth support 2l is detected by the lower limit detector 28 in FIG. 1, and is stopped at the lower limit position.

With this structure, the 7-ru plate 2 does not come into contact with the sealing material 6 during the process of the hearth support 2l rising from its lower limit position to its upper limit position, so that the worm gear 9c of the screw jack 9' No heavy load is applied to it.

Therefore, wear of the screw shaft 78a is prevented when the hearth 3 is raised.

Further, in the above embodiment, the levers 25 are arranged on the hearth support 21 at approximately equal angular intervals, and these levers 25 are driven by one air cylinder 26, so that the hearth
It is possible to maintain the levelness of the seal plate 2 on the seal material 6.
The tip bites in evenly. This allows for more reliable sealing.

In the above embodiment, other means such as a rack 3l and a pinion 32 as shown in FIG. 3 may be used instead of the air cylinder 26. Hearth biasing means 22
Also, a hydraulic mechanism or the like may be used in place of the screw jack 9'.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the sealing structure of the hearth lifting type batch furnace according to the present invention, and FIG. FIG. 3 is a vertical sectional view showing a main part of a modification of the seal structure of the hearth-lifting batch furnace shown in FIG. 1; FIG. 4 is a seal structure of a conventional hearth-lifting batch furnace. FIG. l... Furnace body, 2... Seal plate, 3... Hearth, 4
...Sealing ring member, 5...Groove, 6...Sealing material, 7...Lower opening, 9.9l...Screw jack ψ 9c...Usaichi mugia, 2l...Hearth Support stand, 2
2... Hearth biasing means, 25... Lever 26... Air cylinder, 27... Upper limit detector, 28... Lower limit detector.

Claims (1)

[Claims] (1) a seal plate provided on the furnace body side, surrounding the opening in the lower part of the furnace body and protruding from the opening end surface of the furnace body;
A sealing ring member having a ring-shaped groove opposite to the tip of the sealing plate and fixed to the hearth side to receive the sealing plate, and in which a sealing material made of an elastic material is housed. In the hearth-lifting batch furnace, the hearth is biased toward the furnace body, and the tip of the seal plate is bitten into the sealing material of the sealing ring member to seal the inside of the furnace body. , a hearth support for supporting the hearth; a hearth support elevating means for raising and lowering the hearth support; and a hearth support disposed between the hearth and the hearth support; and a hearth biasing means for uniformly biasing the lower surface toward the furnace body, and after the hearth support is raised to a certain position by the lifting means, the hearth is A seal structure for a hearth raising/lowering type batch furnace, characterized in that it is biased toward the furnace body.