GB2156846A

GB2156846A - Improvements relating to coke oven doors

Info

Publication number: GB2156846A
Application number: GB08507214A
Authority: GB
Inventors: Michael Bohm; Manfred Friedrichs
Original assignee: Dr C Otto and Co GmbH
Current assignee: Dr C Otto and Co GmbH
Priority date: 1984-03-24
Filing date: 1985-03-20
Publication date: 1985-10-16
Also published as: IT8547654A0; GB2156846B; DE3410922A1; FR2561658A1; FR2561658B1; IT8547654A1; JPS60212482A; DE3410922C2; IT1182182B; GB8507214D0

Abstract

A sealing plate (2) for a coke oven door is suspended on a support member (1) loosely and with provision for movement relatively thereto perpendicularly to the centre plane. Compression springs (16) are disposed at predetermined intervals around the periphery of the support member (1) and contact the sealing plate (2) directly and press the same on to the sealing frame. The spring travel of the compression springs (16) is such as to make it possible to take over the function of conventional door- latching mechanisms. The sealing plate (2) can comprise a planar plate having a lateral peripheral sealing strip (3) which extends perpendicularly to the sealing-plate plane and engages the door lining. The sealing strip (3) can be so disposed on the sealing plate (2) as to be movable lengthwise of the oven chamber. <IMAGE>

Description

SPECIFICATION Improvements relating to coke oven doors The invention relates to coke oven doors for closing the chamber of a horizontal chamber type coke oven and is concerned with a type of door comprising a moving member or leaf embodied by sectional framework and devised as a support member. The door also incorporates a sealing plate which is separate from the leaf and which is retained thereby and whose sealing strip is, when in the latching position, pressed against the oven chamber frame by a latching mechanism having at least one latching beam.

In a prior coke oven door of this kind the moving member or leaf comprises a separate force-transmitting unit and a separate sealing unit connected with reduced clearance, for instance, by way of an articulation, to the force-transmitting unit. The leaf, which is made of box section material, has pressing pins distributed uniformly over its periphery, the pins being either screws or being retained resiliently. The function of the pins is to press the sealing element on to the sealing surface at a uniform pressure. This door has a conventional latching mechanism with a latching spring or latching spindle.

It is an object of the invention so to devise a coke oven door of the kind comprising a support member and a separate sealing plate that the conventional door-latchig mechanism with its latching spring or latching spindle can be omitted and so that the sealing plate is capable of adapting automatically to distortions of the door lining which may occur in the operation of the coke oven.

According to the invention there is provided a coke oven door for closing the chamber of a horizontal chamber type coke oven, the door comprising a moving member or leaf embodied by sectional framework and devised as a support member, the door also comprising a sealing plate which is separate from the leaf and which is retained thereby and whose sealing strip is, when in the latching position, pressed against the oven chamber frame by a latching mechanism having at least one latching beam, the sealing plate being suspended on the support member loosely and with provision for movement relatively thereto perpendicularly to the centre-plane, compressions springs disposed at predetermined intervals around the periphery of the support member contacting the sealing plate directly and, pressing the same on to the sealing surface of the door lining, the spring travel of the compression springs, being such as to make it possible to take over the function of conventional door-latching mechanisms.

Preferably the sealing plate comprises a planar plate having a lateral periphery sealing strip which extends perpendicularly to the sealing-plate and engages the door lining. The sealing strip may be so disposed on the sealing plate as to be movable lengthwise of the oven chamber.

The sealing plate ideally is suspended on the support member by means of support lugs (preferably two) disposed at the top end of the plate and engaging in slots which are present in the support member and in which the lugs slide. The door may incorporate at least one steel section member which is disposed on the sealing plate, projects in the direction of the support member, extends through an opening therein and has at its end a thickened part for limiting movement of the sealing plate relatively to the support member.

Preferably, the sectional framework which forms the leaf is made of I-section material and the slots and openings for receiving the support lugs and the steel section members are present in those two flanges of the Isection member which are near the oven chamber.

The latching mechanism can comprise one or more latching stations each having a latching beam without latching spring or latching spindle, the latching beams engaging conventionally behind latching hooks on the oven chamber frame to latch the door.

The main difference from conventional coke oven doors is that the sealing plate, releasably disposed on the leaf, is so suspended as to be movable relatively thereto, while the sealing plate and the leaf are inter-connected merely by springs such that the conventional doorlatching mechanism can be omitted. This ensures that the sealing plate and the leaf can deform freely and independently of one another in accordance with mechanical and heat stressing, so that the sealing plate can adapt optimally to any deformation of the door lining. The construction according to this invention enables springs having considerable spring travels to be used which, in addition to their known function of pressing the sealing strip resiliently against the door frame, take over the function of the conventional latching spring or latching spindle.Long spring travels are not responsible for any substantial pressure drop or pressure rise when travels change because of adaptation and the conventional latching distance of 1 5 mm can be accommodated readily. The main element responsible for the flexibility of the sealing means in the door according to this invention is not the sealing strip but the entire sealing plate.

Another advantage is that there is no need to machine the contacting surfaces of the latching mechanism casings and much of the contacting surfaces for the sealing strip or spring casings. The sealing strip and the sealing plate have the same co-efficients of expansion as one another. The door can be fitted to existing plant and produced from conventional steel section material. Assembly and operating costs are low since the sealing plate adapts to any deformation of the door lining without any need for adjusting or driving work being necessary.

The invention may be performed in various ways and a preferred embodiment thereof will now be described with reference to the accompanying drawings, in which: Figure 1 is a cross-section through a coke oven door according to the invention on the line I-I of Fig. 2, Figure 2 is a front view of the door, and Figure 3 is a side view of the door.

In the embodiment illustrated, a support member 1 is defined by a rectangular frame of I-section members. A sealing plate 2 is a planar plate which extends parallel to the member 1 and which has on its edge a peripheral sealing strip 3, the same extending perpendicularly to the plate 2 and being pressed, when in a latching position, against a door frame 4 which extends around the opening of the coke oven chamber. The strip 3 is secured to the plate 2 by means of screw hooks 5 which, as can be seen from Figs. 2 and 3, are arranged at regular intervals around the periphery of the plate 2. Securing is by means of screw-threaded nuts 7 on fixing blocks 6 rigidly connected to the plate 2.

The sealing plate, instead of being planar as illustrated, can be a channel-section plate or have on its edge a peripheral angle-member frame, in which event the screw hook can be secured to that arm of the angle-member frame or channel-section member which projects beyond the sealing plate in the direction of the support member, so that the units 6 can be omitted. If an angle-section frame or a channel-section member is used, the sealing plate can be correspondingly thinner. The sealing plate can have insulation material placed on it.

Visible in the left-hand half of Fig. 1 is an adjusting screw 8 which is also secured to a unit 6. The screw 8 can be rotated so as to act, by way of a claw 9, on the sealing strip 3 and move the same lengthwise of the oven chamber. Adjusting screws of this kind are not essential and are intended for cases where excessive deformation of the door frame may occur, which the sealing plate cannot compensate for automatically.

The sealing plate 2 is not rigidly secured to the member 1 but is merely suspended at its top end by means of two brackets 10 in the form of flat irons rigidly connected to the plate 2. The brackets 10 extend through slots present in those two flanges of the I-section members which are near the coke oven chamber and which embody the member 1, as shown in the left-hand half of Fig. 1 and in Figs. 2 and 3. Fig. 2 shows the two brackets 10, one of which can be seen in Fig. 1. The plate 2 also has top and bottom guides 11 which are embodied by section steel members and which, like the brackets 10, extend through apertures in the flanges of the member 1. The guides 11 have no bearing or support function and serve to prevent the plate 2 from becoming completely detached from the member 1.Accordingly, the ends of the members 11 have a thickening 1 2 which limits horizontal movement of the plate 2 relatively to the member 1. The thickenings 1 2 must of course be thicker than the width of the apertures.

Two conventional latching beams 13 serve to latch the door at the two latching stations and when in the latching position engage behind latching hooks 14 secured to the coke oven chamber door frame. Conventionally the latching mechanism comprises a latching spring or latching spindle. A feature of this invention is that such spring or spindle can be omitted; instead, according to the invention, compression springs 1 6 which, in the embodiment illustrated, are disposed in casings 15, are arranged at predetermined intervals around the periphery of the member 1. Preferably, the casings 1 5 are secured in recesses of the two outwardly directed flanges of the member 1 in the manner visible in Fig. 1.The springs 1 6 press on the plate 2 and therefore cause the strip 3 to be pressed uniformly against the coke oven door frame 4. The sealing strip 3 is therefore mounted resiliently.

Since the construction according to the invention is such that springs having large spring travels can be used, the approximately 1 5 mm distance additionally necessary for unlatching can readily be accommodated without an excessive increase in the stressing of the springs and of the steel members.

The springs must therefore take up both the distance as far as the latching state plus the additional distance necessary for latching and unlatching and must be so designed that their spring forces do not decrease or increase appreciably because of minor alterations in travel in the latched state due to door frame deformation and that in unlatching and latch ing the springs are not compressed as far as or substantially as far as the block length so that the spring forces become very great.

Claims

1. A coke oven door for closing the chamber of a horizontal chamber type coke oven, the door comprising a moving member or leaf embodied by sectional framework and devised as a support member, the door also compris ing a sealing plate which is separate from the leaf and which is retained thereby and whose sealing strip is, when in the latching position, pressed against the oven chamber frame by a latching mechanism having at least one latch ing beam, the sealing plate being suspended on the support member loosely and with pro vision for movement relatively thereto perpendicularly to the centre-plane, compression springs disposed at predetemined intervals around the periphery of the support member contacting the sealing plate directly and pressing the same on to the sealing surface of the door lining, the spring travel of the compression springs being such as to make it possible to take over the function of conventional doorlatching mechanisms.

2. A door according to claim 1, wherein the sealing plate comprises a planar plate having a lateral peripheral sealing strip which extends perpendicularly to the sealing-plate plane and engages the door lining.

3. A door according to claim 2, wherein the sealing strip is so disposed on the sealing plate as to be movable lengthwise of the oven chamber.

4. A door according to any one of claims 1 to 3, wherein the sealing plate is U-shaped.

5. A door according to any one of claims 1 to 4, wherein the sealing plate is suspended on the support member by means of support lugs, disposed at the top end of the plate and engaging in slots which are present in the support member and in which the lugs slide.

6. A door according to any one of claims 1 to 5, wherein at least one steel section member is disposed on the sealing plate, projects in the direction of the support member, extends through an opening therein and has at its end a thickened part for limiting movement of the sealing plate relatively to the support member.

7. A door according to any one of claims 1 to 6, wherein the sectional framework which forms the leaf is made of I-section material and the slots and openings for receiving the support lugs and the steel section members are present in those two flanges of the I-section member which are near the oven chamber.

8. A door according to any one of claims 1 to 7, wherein the latching mechanism comprises one or more latching stations each having a latching beam, without latching spring or latching spindle, the latching beams engaging behind latching hooks on the oven chamber frame to latch the door.

9. A coke oven door substantially as herein described with reference to the accompanying drawings.