JPH02101387A - Door opening and closing device for heating furnace - Google Patents

Abstract

PURPOSE:To surely effect the air-tight seal of a door by a method wherein a heating furnace is provided with an elevating means, elevating and descending the door between an elevated position and a descended position along a gate type elevating frame, and an inclining means, inclining the gate type elevating frame between the furnace mouth closing position of the door and the inclined position of the same, which is apart from the furnace mouth. CONSTITUTION:A door 1 is provided with projected guide pieces 5 at both sides thereof and the door 1 is attached so as to be capable of engaging the guide pieces 5 with the guide rails 7 of a gate type elevating frame 6 and elevating and descending the door 1 between the elevated position of the door, whereat a furnace mouth is opened, and the descended position of the door, whereat the furnace mouth is closed, along the gate type elevating frame 6. The gate type elevating frame 6 is attached to the fore position of the furnace mouth 3 by a supporting shaft 12 with bearings at the lower end 6b thereof and a hydraulic cylinder 13, connecting the intermediate height 6c of the frame and a furnace body 2, is operated so as to be expanded and contracted whereby the frame 6 is constituted so as to be inclined between the inclined position of the same and the standing and closing position of the same, whereat the furnace mouth is closed so as to be air-tight. According to this method, air-tight seal between the door and the outer wall of the furnace may be effected surely and the damage of sealing material may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an opening/closing device for a door of a heating furnace such as a firing furnace.

(Prior Art) Conventionally, in heating furnaces such as firing furnaces, the door is hinged to one side of the entrance of the furnace body and the door is opened and closed by rotating around the vertical axis of the hinge. The door is fixed to a trolley that carries the articles to be loaded and moves in and out of the furnace main body, and the door is opened and closed by moving the trolley in and out.

However, the former rotating type requires a large floor area for the door to rotate, and the latter fixed type does not require a seal between the door and the outer wall of the furnace around the furnace mouth. The problem is that it is difficult.

(Problem B to be Solved by the Invention) The present invention provides a heating furnace door opening/closing device that requires a small floor area for opening and closing the door and is capable of airtight sealing between the door and the outer wall surface of the furnace body around the furnace mouth. That is.

(Means for Solving the Problems) Therefore, according to the present invention, the door is attached to the gate-type lift frame so as to be movable up and down, the gate-type lift frame is pivotably supported at its lower end, and the door is attached to the gate-type lift frame so as to be tiltable. Means for raising and lowering the door along the line between a raised position for opening the furnace mouth and a lowered position for closing the furnace mouth, and a raised closed position in which the door lowered to the furnace mouth closing position airtightly closes the furnace mouth, and a means for separating the door from the furnace mouth. Means for tilting the gate-shaped lifting frame is provided between the tilting position and the tilting position.

(Function) According to the present invention, when opening the furnace mouth, first, the gate type lifting frame is tilted to separate the door from the furnace body, and then the door is raised along the gate type lifting frame. to open the furnace mouth.

In addition, when closing the furnace opening, the door is lowered along the gate-shaped lifting frame in the tilted position to the furnace opening closing lowered position, and then,
By raising the gate-shaped lifting frame toward the furnace mouth and pressing the door against the furnace body, it is possible to airtightly seal between the door and the outer wall of the furnace body around the furnace mouth.

As described above, according to the present invention, there is a space sufficient to tilt a gate-shaped lifting frame having a height sufficient to raise and lower the door from the furnace mouth closed position to the furnace mouth open position, using its lower end as a pivot point. The floor space occupied can be extremely reduced. Furthermore, the door can be placed in close contact with the outer wall of the furnace body around the furnace mouth for an airtight seal, and since the door does not come into sliding contact with the furnace body when the door is opened or closed, the contact surface between the door and the furnace body will be damaged. Therefore, the life of the sealing material provided on these contact surfaces can be extended.

(Example) The drawing shows an example of the present invention, in which the door 1 is constructed by supporting firebricks, castable refractory materials, ceramic fibers, etc. with an iron jacket plate, and when the furnace mouth 3 is closed, It is configured to form an airtight seal with the furnace body outer wall 4 around the furnace mouth of the furnace body 2.

Guide pieces 5 are protruded from both sides of the door 1, and the guide pieces 5 are engaged with the guide rails 7 of the gate-type lifting frame 6 to move the door 1 to the gate-type lift frame 6.
Install it so that it can be raised and lowered along the In the illustrated example, a lifting fluid is used as an actuator for raising and lowering the door 1 along the gate-shaped lifting frame 6 between the opening and lowering position of the furnace opening shown in FIG. 3 and the lowering position of closing the furnace opening shown in FIG. A cylinder device 8 is used, its base end is fixed to the lower end of the portal lift frame 6, a wire 10 is connected to the upper end of the piston rod 9 of the lifting fluid cylinder device 8, and the wire 10 is attached to the gate lift frame 6. It is connected to the upper end of the door 1 via a guide pulley 11 provided at the upper end. A wire hoist can also be used instead of the lifting fluid cylinder device 8 described above.

The lower end 6b of the gate-type lifting frame 6 is pivotally connected to the front position of the furnace mouth 3 by a pivot shaft 12, and a tilting fluid is provided between the intermediate height portion 6c of the gate-type lifting frame 6 and the furnace body 2. By connecting the cylinder device 13 and expanding and contracting the fluid cylinder device 13, the gate-type lifting frame 6 can be moved to the tilted position shown in FIG. It is constructed so that it can be moved between an upright closed position and an airtight closing position.

In order to make the door 1 airtightly adhere to the outer wall 4 of the furnace body around the furnace mouth as required, a plurality of latches operated by other fluid cylinder devices (not shown) are provided on the outer wall 4 of the furnace, and the door 1
In the closed state, the airtight seal of the door can be further enhanced by engaging the door 1 with latches by a fluid cylinder device at a plurality of positions on the outer periphery of the door 1 to draw the door 1 to the outer wall 4 of the furnace body.

It is preferable to fully automate the above-mentioned lifting and lowering of the door and tilting of the gate-shaped lifting frame in conjunction with the loading and unloading of the trolley carrying the article to be heated (effects of the invention). For example, an airtight seal between the door and the outer wall of the furnace is ensured when the furnace opening is opened and closed, the sealing material is prevented from being damaged, and the floor area required for opening and closing the door can be significantly reduced.

[Brief explanation of the drawing]

1 is a schematic front view of a door according to the invention, FIG. 2 is a schematic side view of the door shown in FIG. 1, and FIG. 3 is a schematic side view similar to FIG. 2 showing the door in an open position. 1... Door 2... Furnace body 3... Furnace mouth 4... Furnace outer wall around the furnace mouth 5... Guide piece 6... Gate-shaped lifting frame 7... Guide rail 8. ...Elevating fluid cylinder device 9...Piston rod 10...Wire 11...
-Guide pulley 12...Pivot shaft 13...Tilt fluid cylinder device Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] 1. A gate-shaped lifting frame that guides and supports the door of the heating furnace so that it can be raised and lowered, and is pivotally supported at its lower end so that it can tilt, and the door is moved along the gate-shaped lifting frame between the open and raised position and the furnace mouth closed and lowered position. and means for tilting the gate-shaped lifting frame between an upright closing position where the door airtightly closes the furnace opening and a tilted position where the door is spaced from the furnace opening. Door opening/closing device.