Patent GB-699399-A (GB)
Title: Improvements in door-handling means for horizontal chamber coking ovens
IPC: C10B25/14
Filed: 1952-08-01
Abstract: 699,399. Operating coke oven doors. KOPPERS GES., H. Aug. 1, 1952 [Aug. 8, 1951; Dec. 12, 1951], No. 19546/52. Class 55(i) [Also in Group XXVI] A coke oven door operating mechanism by means of which the unlatched door can be lifted, withdrawn and pivoted aside, comprises. independent pneumatic or hydraulic devices for releasing the pressure exerted by the door closure mechanism and for lifting the door slightly so that it can be withdrawn, the pressure supply to the devices being controlled by a single change-over device. The general arrangement of'the operating mechanism is shown in Fig. 1. The sealing flange 3 of the door 2 is pressed against the frame 4 of the coke oven 1 by springs 5 which engage latches 6 the ends of which are held in hooks secured to the oven body. The door operating mechanism is carried on a vertical girder 11 pivotally secured to the coke car or coke pusher frame 7. It consists of linked lifting claws 13 and 14 pivoted at 12 and adapted to engage lugs 15 on the door and pressure devices 30 which serve to compress the springs 5. Claws 13 and 14 are raised and lowered by. a double-acting pneumatic motor 18, 37 and the devices 30 by single-acting motors 29 of the same type, the pressure supply to the motors being controlled by a manually operated change-over device 31. The claw operating motor is shown in section in Fig. 2. It consists of a thrust motor 18 and a retraction motor 37 each having an annular bellows 19, e.g. of rubber, mounted one each side of a ring 22 which is bolted to a member 23 adjustably secured to the girder 11. A shaft 21 pivotally connected to claw 13 is slidably mounted in ring 22 and has flanges 20 and 40 engaging the outer sides of the bellows 19, so that admission of air to either bellows causes the shaft to move and the claws to engage or disengage the lugs 15. The control change-over device 31 is shown diagrammatically in Fig. 5. It consists of a shaft 55 carrying cams 58 and driven by a hand crank 57 through a worm and wheel 56. The cams are engaged by rods 60 which raise or lower piston valves in cylinders 61, 62 and 63 which are connected respectively to the thrust motor 18, the retraction motor 37 and the pressure motors 29. Each cylinder has a supply from a compressed air line 32 and is provided with an exhaust port 66. Operation. After the door operating mechanism has been positioned in front of the door concerned, the handle 57 is rotated, and the first cam moves the valve 61 so that pressure is admitted to motor 18, driving shaft 21 forward so that claws 13 and 14 engage under lugs 15, the door being held against movement by the closure pressure of springs 5. With further rotation of the cam shaft the valve 63 moves to admit pressure to motors 29 and, simultaneously, valve 61 moves to seal off the bellows of motor 18. The pressure devices 30 release springs 5 and the door lifts slightly due to the expansion of the air trapped in motor 18, the latches 6 are swung clear and the door is withdrawn. To replace the door, it is centred over the opening, a locking device 69, 70 which operates on shaft 55 when the door opening cycle is complete, is released and the handle 57 again rotated. Valve 62 is thus actuated to admit pressure to the retraction motor 37 so that motor 18 is compressed and the door is lowered into position. The latches 6 are engaged and handle 57 further rotated, the valves then connecting all the motors with exhaust, so that claws 13 and 14 are lowered and the springs 5 are released to apply sealing pressure to the door.