GB2051851A - Leveller door for coke oven door - Google Patents

Abstract

A leveller door for closing an opening 11 provided adjacent the upper end of a coke oven door 12, has a sealing member 26 in spaced apart position so as to absorb thermal conduction to the door 13. The leveller door 13 has a means 23 to automatically force the sealing member onto the entire surround of the opening 11. A means 18, 19, 20, 21 for opening and closing the leveller door 13 is provided thereon to operate the latter mechanically. Thereby, the leveller door can completely prevent gas-leakage and can safely be opened and closed by a machine. <IMAGE>

Description

SPECIFICATION Leveller door for coke oven door The present invention relates to a leveller door for closing an opening, which is generally formed adjacent the upper end of the pusher-side coke oven door, to receive a leveller provided on a pusher-machine. However, it should be noted that the opening with the leveller door may be occasionally provided on a coke-side oven door.

The coke oven doors for closing the pusher-side openings of respective coking chambers of a coke oven battery, generally have an opening to receive the leveller. The opening in the oven door is closed by a leveller door pivotally provided on the oven door.

The conventional leveller doors are provided with frame-like sealing edges, for gas-sealing purposes, on the peripheries of the door body. The sealing edges are fixed onto the periphery of the door body by fitting members of which the heads are tapped to adjust the inward protrusion thereof.

As the leveller doors are generally positioned near the top of the oven door, it is dangerous to adjust the protrusion of the sealing edge manually.

The conventional leveller doors are directly subjected to substantial oven heating such as may cause outward bending of the door body. The sealing edges are also bent outwardly according to bending of the door, which causes gas-leakage.

Thus adjustment of the sealing edge by tapping may be frequently necessary.

Further, in the prior art, the leveller doors are opened and closed manually by a worker who may get in front of the pusher-machine or the like. The carrying out of the opening and closing of the leveller door is not so effective and is quire dangerous.

The present invention is to overcome the aforementioned defect and disadvantage in the prior arts.

Therefore, it is an object of the present invention to provide an improved leveller door having a sealing member constantly biased toward the opening in the oven door, so as not to require the tapping adjustment therefor, and an installing member which is provided with means to open and close the leveller door mechanically on one end thereof, and a latching and unlatching means on the other end.

Another object of the invention is to provide a leveller door of which the door body is not directly subjected to substantial oven heating so as to eliminate heat-distortion.

According to the invention, a leveller door, for closing an opening formed adjacent the upper end of a coke oven door to receive the leveller door, comprising a metallic door body pivotally mounted on the edge of said opening and a sealing edge provided on the entire surround of said door body, wherein said door body is provided with pushing elements, inner ends of which are fixed on a flexible sealing member, on respective corners thereof; said pushing elements being adapted to force said sealing member onto the entire surround of the opening for gas-sealing purposes; and said door body is pivotally mounted on one side edge of the opening by an installing member, having operating means to move the installing member with the door body on one end of said installing member and latching and unlatching means on the other end thereof.

The leveller door constructed in accordance with the present invention, since the sealing member is separately provided in front of the leveller door body and is spaced apart from the latter, can eliminate the heat-distortion of the door body. Further, if heat-distortion of the door body does arise, the sealing member is constantly forced or biased onto the entire surround of the opening of the oven door. Thus the sealing member can completely prevent gas-leakage. Still further, air enclosed within the space between the door body and sealing member may be exchanged as the leveller door is opened when the sealing member may be out of contact with the door body.

It is another advantage achieved by the invention in that the leveller door can be latched and unlatched by mechanical operation and opened and closed co-operatively with the latching and unlatching thereof.

The other objects, features and advantages of the invention may be apparent from the hereinafter illustrated preferred embodiment of the invention.

The invention will be illustrated more fully by way of examples with reference to the accompanying drawings, in which: Fig. 1 is a schematic sectional view of a coke oven door with a leveller door in accordance with the preferred embodiment of the invention: Fig. 2 is an enlarged front elevational view of the leveller door of Fig. 1: Fig. 3 is a cross sectional view taken along the lateral centre line of Fig. 2, but wherein the portions provided with pushing members are sectioned; Fig. 4 is a further enlarged sectional view of a portion of pushing member of Fig. 3, in a position of closing of the leveller door; Fig. 5 is a similar view to Fig. 4, but in a position of opening of the leveller door.

Referring to Fig. 1, there is illustrated a coke oven door 12 having an opening 11 to receive leveller (not shown) adjacent the upper end thereof. Corresponding to the opening 11 there is pivotally mounted a leveller door 13 so as to close and open the opening 11. An installing arm 14 on which the leveller door body 13 is fixed by a bolts and nuts in known manner, has bifurcate legs. On the junction of the arm 14 corresponding to the central portion thereof, there is provided an adjusting threaded shaft, the inner end of which is contacted by a main-spring 1 5 so as to force the door body 13 inwardly towards the closed position.

On the ends of respective bifurcate legs of the arm 14 is formed an aperture to fixedly receive a shaft in the form of an actuation lever 1 7. The shaft is rotatably engaged within stationary plates 1 6. Thus, the arm 14 with the door body 13 is rotatable about the axis of shaft 1 7.

On the other end of the arm 14 is formed a hook 18 opposing a latching lever 19 to be engaged therewith. The latching lever 1 9 is rotatably connected with stationary plates 1 6 by a shaft. On both sides of the level 1 9, there are wound around the shaft springs 21, one end of each of which is engaged with the lever 1 9 to bias the same anti-clockwise in Fig. 3.

At the one end of the lever, there is provided a roller 20 to be contacted with latching and unlatching means which is generally provided on the pusher-machine.

On the respective corners of the door body 13.

There are provided with projective portions at the respective centres of which are formed apertures 22. As shown in Figs. 4 and 5, grommets 27, 28 respectively having apertures at the centre thereof are disposed through the apertures 22. Shafts 24 are disposed through the apertures 22 and the apertures of the grommets 27, 28. Between the grommets 27, 28 each shaft 24 is wound a compression spring 23. Each shaft 24 is provided with a screw threaded portion to be engaged with nuts 29 on the top thereof in order to adjust the force of the spring.

Each shaft 24 extends inwardly through a spacer 25. The inner end of the shaft 24 is welded to a sealing plate 26 of flexible metal plates. The sealing plate 26 is substantially of the same size as the door body 13 and is positioned in front of the door body 13 with a space 32. The space 32 is intended to act as heat-radiating means or aircooling means.

A knife edged frame 30 is welded substantially centrally thereof on the entire periphery of the sealing plate 26. The distance between the outer end 31 and the welded portion of the knife edged frame 30 is slightly longer than the thickness of the spacer 25 to prevent thermal conduction to the door body 13 through the spacer 25.

In operation, when the leveller door is closing the opening 11 of coke oven door 12, the hook 1 8 of the arm 14 is engaged with the latching lever 19, as shown in Fig. 3. Thus the arm 14 compresses the mainspring 1 5 so as to force the door body toward the oven chamber. At the same time, the spring 23 biases the sealing plate 26 toward the oven chamber. Thus the knife edged frame 30 is forced to tightly contact the surrounding edge of the opening 11 in the door 12.

On closing the opening 11 of the oven door 12, the space 32 between the door body 13 and the sealing plate 26 is in closed position, and acts to prevent thermal conduction of oven heat to the door body 13. Thus, the door body is prevented from heat-distortion.

Further, even if the door is distorted by oven heat, the knife edged frame 30 may keep in contact with the surrounding edge of the opening 11 of the oven door 12 by the force of spring 23.

Thereby, the leveller door can completely prevent gas-leakage.

To open the leveller door, pushing the roller 20 of the latching lever 1 9 to rotate the latter about the shaft against the spring 21, as shown in Fig. 2, causes the unlatching of the arm 14. Thereby, the actuation lever 1 7 is operative to rotate about its axis to open the leveller door with the arm 14 thereabout.

It should be noted that the aforementioned opening and closing operation of the leveller door may be performed by various means, for example it may be performed by means provided on the pusher machine.

As shown in Fig. 5, the knife edged frame 30 is in out of contact with the leveller door on the opening thereof. Thus, the exchanging of the air in space 32 for air-cooling purposes is performed.

Thereby, the invention can fulfill ail the objects sought therefor.

While the specific embodiment of the present invention illustrates the application of the principles of the invention, it wili be apparent that the invention may be embodied otherwise without departing from such principies.

Claims (6)

1. A leveller door, for closing an opening formed adjacent the upper end of a coke oven door to receive the leveller door, comprising a metallic door body pivotally mounted on the edge of said opening and a sealing edge provided on the entire surround of said door body, wherein the improvement is characterised in combination that said door body is provided with pushing elements, inner end of which are fixed on a flexible sealing member. in respective corners thereof; said pushing elements being adapted to force said sealing member onto the entire surround of the opening for gas-sealing purposes; and said door body is pivotally mounted on one side edge of the opening by an installing member, having operating means to move the installing member with the door body on one end of said installing member and latching and unlatching means on the other end thereof.

2. A leveller door as recited in claim 1, wherein said pushing elements each comprise a shaft provided through said leveller door body and a compression spring wound therearound.

3. A leveller door as recited in claim 1, wherein said latching and unlatching means comprises a hook formed at the end of said installing member and a latching lever interengageable therewith.

4. A leveller door as recited in claim 3, wherein said latching lever is mounted for rotation about a fixed axis and is biased towards the latching position.

5. A leveller door as recited in claim 1, wherein said sealing member comprises a flexible metal plate and a knife edged frame provided on the entire periphery of said plate.

6. A leveller door substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.