Patent Application
20110030157
The invention relates to an apparatus on a coal-charging larry cart for lifting lids out of charging holes in the roof of a coke oven and for cleaning the charging-hole jambs, the apparatus having
a lid lifter having a support arm carrying a lift magnet,
a jamb cleaner having a support arm carrying a cleaning head,
drives for vertically positioning the support arms, the lid lifter and the jamb cleaner each being mounted on a respective carriage for horizontal movement between an operating position in which the lift magnet or the cleaning head is aligned is with a charging hole in the roof of the coke oven, and a rest position spaced from the charging hole.
In the ideal case, the charging holes in the roof of a coke oven are equidistantly spaced and aligned in the travel direction of the coal-charging larry cart. The real conditions on a coke oven regularly deviate from this ideal case. In particular in older coke ovens, the position deviations of the charging holes in both axes are frequently ±50 mm, which may not be compensated for by centering aids typical in the art. This has the result that the charging hole lids may no longer be lifted automatically and later replaced automatically into the charging-hole jamb, and the charging-hole jamb cleaning also no longer functions satisfactorily. In coking-plant operation, interruptions arise in the automatic sequence of the coal-charging larry cart in this way and personnel-intensive interventions are necessary. Furthermore, charging-hole jambs on the roof must frequently be realigned, so that lid lifters and jamb cleaners may operate properly. Significant maintenance costs thus arise for the coking-plant operation.
A system that combines apparatuses for lifting lids out of charging holes and for cleaning the charging-hole jambs with a coal-charging apparatus having a horizontal conveyor screw with an outlet-side charging telescope to form an operating unit that is set up to be adjustable in two axes on the underside of a coal-charging larry cart is known from EP 1 293 552 B1. In these known systems, the horizontal conveyor screw is suspended on an positionable carriage that is guided on tracks on the underside of the coal-charging larry cart. The horizontal conveyor screw can move transversely to the tracks on profiled elements of the positioning carriage. The cover lifter and the jamb cleaner may adapt to the particular position of the charging holes in the roof of the coke oven by a dual-axis positioning of the operating unit. Using the known configuration, the lift magnet of the cover lifter and the cleaning head of the jamb cleaner may be brought into an operating position in which they align with the charging hole in the roof of the coke oven. However, this known configuration requires large vertical space below the coal outlet on the underside of the coal-charging larry cart, because the operating unit is attached on the intake-side end of the horizontal conveyor screw using a compensator that must make up for horizontally positioning the operating unit relative to two axes. This installation space is not always available. The known apparatus is not suitable or is only suitable with restrictions for retrofitting to existing coking installations.
The object of the invention is to provide an apparatus having the purpose described above, that requires little space, may compensate for large position deviations of the charging holes, and that is suitable for retrofitting to existing coke oven.
Starting with an apparatus having the features described above, the object is attained according to the invention in that the carriage has a travel frame horizontally movable on rails on the underside of the coal-charging larry cart along a first axis and a support frame inside the travel frame, the support frame being guided for movement relative to the travel frame along a second axis transverse to the travel direction of the travel frame, the drive for the cover lifter and/or the jamb cleaner being mounted on the support frame). The support frame and the travel frame are horizontally movable independently of each other in directions perpendicular to each other. Position deviations of the charging-hole jamb may be compensated for by step-by-step and sequential movement of the travel frame and the support frame or by simultaneous positioning of these parts. The installation height of the carriage comprising travel frame and support frame is low, so that older coke ovens may also be retrofitted with the apparatus according to the invention.
The travel frame and the support frame are preferably generally coplanar. Such a configuration results in a very low overall height of the carriage comprising travel frame and support frame. The travel frame and the support frame are advantageously assembled from U-shaped elements, rollers which run in the U-shaped elements of the travel frame being mounted on the support frame. The travel frame is also equipped with rollers and runs in a track secured below the horizontal conveyor screw of the coal-charging larry cart. The rails for the travel frame preferably are U-shaped elements suspended using supports on the coal-charging larry cart and are laterally open. The rollers mounted on the travel frame engage in the U-shaped elements that are open on one side, and run in these rails.
Hydraulic drives are preferably used for horizontally positioning the support frame and the travel frame. According to a preferred embodiment of the invention, hydraulic drives equipped with distance sensors are attached to the support frame and the travel frame.
A machine controller of the coal-charging larry cart is connected to the hydraulic drives and holds position data for the position of the charging openings in the roof of the coke oven. The deviations of the charging-hole jamb in the X and Y directions from the ideal position are detected using measuring technology at every charging-hole jamb and stored in the machine controller of the coal-charging larry cart. Because of the assignment of these deviations to each charging-hole jamb and each furnace chamber, the lid lifter and the jamb cleaner may be positioned by movements of the respective carriage in such a way that the lift magnet of the lid lifter and/or the cleaning head of the jamb cleaner are oriented centrally to the charging-hole jamb and may be lowered onto the cover and/or into the charging-hole jamb by a purely vertical movement. Pendulum movements and extreme inclined positions of the apparatus are eliminated so that all parts of the apparatus function optimally and the charging hole lid may be securely raised and/or inserted back into the frame and the charging-hole jamb may be cleaned reliably. Centering aids on the charging hole lids, which are typical in practice and represent a risk from the aspect of accident prevention, are eliminated. The dual-axis positioning of the carriage for the position correction of the lid lifter and the jamb cleaner may alternately already be performed during travel of the coal-charging larry cart or after positioning the coal-charging larry cart over the furnace chamber to be charged.
A further embodiment of the apparatus according to the invention provides that the hydraulic drives work together with an optical sensor carried on the coal-charging larry cart and detecting the actual position of the charging openings. The measurement data are relayed directly to the controller of the hydraulic cylinders that move the carriage of the lid lifter and the carriage of the jamb cleaner into a position corresponding to the location of the charging-hole jamb.
According to the invention the drives for the lid lifter and the jamb cleaner are fixed to the support frame of the respective carriage. The drive acting on the support frame is equipped with a distance sensor in this case and is activated in such a way that the lid lifter and/or the jamb cleaner is moved out of a rest position spaced from the charging hole into the operating position on the charging hole while taking the required corrections into consideration. The particular positioning movement is a function of the position deviations to be compensated for and may change from charging hole to charging hole. The correction movement and the movement of the lid lifter/jamb cleaner out of the rest position spaced from the charging hole into the operating position are preferably decoupled, however. In this case, the drives for the lid lifter and the jamb cleaner are each connected to a carriage movable along the profiled elements of the support frame inside the support frame of the respective carriage. The carriage is preferably movable transversely to the travel direction of the support frame, so that the travel movement of the running does not affect the position of the support frame. Hydraulic drives act on the carriage and are supported on the respective support frame and each move the lid lifter and the jamb cleaner using a permanently settable positioning movement between the operating position at a charging hole and a rest position spaced from the charging hole. In this embodiment, all correction movements in the X and Y directions and the travel movement between the rest position and the operating position are decoupled.
The carriages of the cover lifter and the jamb cleaner preferably each have a travel frame, the travel frames being physically spaced from and movable independently of each other. The spatial separation of the carriages allows a flexible adaptation to construction conditions, which is advantageous if older coking plants have to be retrofitted with the apparatus according to the invention. If the site conditions permit, a common travel frame may be used for the carriages. In this case, two alternatives result with regard to the support frame. According to a first embodiment, the support frames for the lid lifter and the jamb cleaner are movable independently of each other and may be positioned using separate positioning drives that are equipped with distance sensors inside the common travel frame. According to a second alternative embodiment, the lid lifter and the jamb cleaner are also mounted on a common support frame that is movable and may be exactly positioned using a positioning drive equipped with a distance sensor. The drives of the lid lifter and the jamb cleaner are mounted in this embodiment on separate carriages that are movable independently of each other inside the support frame.
The invention is explained in greater detail hereafter on with reference to a drawing that only illustrates one embodiment. The single FIGURE schematically shows an apparatus on the underside of an unillustrated coal-charging larry cart for raising lids 1 out of charging holes 2 in the roof of a coke oven and for cleaning the charging-hole jambs 2. The basic construction of this apparatus includes a lid lifter 3 that has a support arm 4 carrying a lift magnet 5, a jamb cleaner 6 that has a support arm 4′ carrying a cleaning head 7, and drives 8, 8′ for vertically positioning the support arms 4, 4′. The lid lifter 3 and the jamb cleaner 6 flank a charging unit 9 carried on the underside of the coal-charging larry cart and comprising a horizontal screw conveyor 10 and a telescoping charging chute 11. The lid lifter 3 and the jamb cleaner 6 are each mounted on a respective carriage 12, 12′ for horizontal movement between an operating position A in which the lift magnet 5 or the cleaning head 7 is aligned with a charging hole 13 in the roof of the coke oven and a rest position B spaced from the charging hole.
The carriage 12 for the lid lifter 3 and the carriage 12′ for the jamb cleaner 6 are of essentially identical construction. They each have a travel frame 15 that is horizontally movable on rails 14 on the underside of the coal-charging larry cart along a first axis Y and a support frame 16 mounted inside the travel frame 15 and supported such that it is movable on the travel frame along a second axis X transverse to the travel direction of the travel frame 15. The drive 8 for the lid lifter 3 and the drive 8′ for the cover cleaner 6 are mounted on the support frames 16 of the respective carriages 12, 12′.
It is obvious from the illustration that the travel frame 15 and the support frame 16 are generally coplanar. Both frames 15 and 16 are constructed from U-shaped elements. Rollers 17 that run in the U-shaped elements of the travel frame 15 are mounted on the support frame 16. The rails 14 for the travel frame 15 also comprise U-shaped elements suspended by supports 18 on the unillustrated coal-charging larry cart and are open horizontally. Rollers 19 that run in the laterally open rails 14 are mounted on the travel frame 15. The travel frame 15 and the support frame 16 mounted inside the travel frame form a carriage that permits horizontal positioning in the X and Y directions.
In the illustrated embodiment, the rails 14 for guiding the travel frame 15 extend in the travel direction of the coal-charging larry cart (Y direction), while the support frame 16 is guided transversely thereto in the direction of the furnace chamber axis (X axis) on the travel frame 15. This fixing is a function of site conditions. Depending on the construction conditions, it may be advantageous for the rails 14 carrying the travel frame 15 to extend parallel to the X axis and the support frame 16 to be movable in the Y direction.
Hydraulic drives 20 equipped with distance sensors are attached to the support frame 16 and the travel frame 15. A machine controller of the coal-carrying larry cart is connected to the hydraulic drives 20 and holds position data for the locations of the charging holes 13 in the roof of the coke oven. Alternatively, the hydraulic drives 20 may work together with an optical sensor carried on the coal-charging larry cart and detecting the position of the charging holes 13. In the embodiment shown in the FIGURE, the drives 8, 8′ of the lid lifter 3 and the jamb cleaner 6 are connected to carriages 21, 21′ are movable transversely to the travel direction of the support frame inside the support frame 16 of the respective carriage 12, 12′ along the profiled elements of the support frame 16. Hydraulic drives 22 act on the carriages 21, 21′, are supported on the respective support frame 16, and move the lid lifter 3 or the jamb cleaner 6 using a respective permanently settable positioning stroke a, b between the operating position A at a charging hole and a rest position B spaced from the charging hole.
In the illustrated embodiment, the carriages 12, 12′ for the lid lifter 3 and the jamb cleaner 6 each have a travel frame, the travel frames physically spaced from and movable independently of each other. If the site conditions permit it, the carriages 12, 12′ may also have a common travel frame in which the support frames 16 for the lid lifter and the jamb cleaner are mounted and displaceable transversely to the travel direction of the travel frame.
The apparatus according to the invention allows a precise orientation of the lid lifter 3 and the jamb cleaner 6 on the charging holes in the roof of a coke oven and is capable of compensating for operationally related position deviations of the charging holes from a predefined basic position in the X and Y directions. In older coking plants, the position deviations may often be in the magnitude of ±100 to 150 mm along both axes X and Y. The horizontal position deviations of the charging-hole jambs 2 are measured in the longitudinal and transverse directions and stored for each charging-hole jamb in a machine controller on the coal-charging larry cart and updated as needed. The coal-charging larry cart is moved on the roof of the coke oven and positioned at a predefined point corresponding to each of the charging holes 13 to charge a furnace chamber without taking the position deviations of the charging holes into consideration. The lid lifter 3 and the jamb cleaner 6 are then subsequently moved out of a rest position B spaced from the charging hole into an operating position A adjacent the charging hole and positioned with the aid of dual-axis compensation movements of the carriage 12, 12′ in such a way that the lift magnet 5 of the lid lifter 3 and/or the cleaning head 7 of the jamb cleaner 6 are centered on the cover/charging-hole jamb. In a first step, the lift magnet 5 is lowered onto the charging hole lid and activated. The charging hole lid is raised out of the charging hole 13 and moved into the rest position B. In the next step, the cleaning head 7 of the jamb cleaner 6 is lowered into the charging-hole jamb 2 and the charging-hole jamb is cleaned. After cleaning is ended and the jamb cleaner 6 has been moved back into its rest position, the charging telescope 11 is lowered and the coke oven chamber is charged with feed coal. After the charging procedure and after the charging hole lid has been reinserted by the lid lifter, the travel frames 15 of the carriages 12, 12′ are moved back into their starting positions, this procedure being able to be performed during travel of the coal-charging larry cart to the coal tower. The lid lifter and the jamb cleaner are now again ready for a repositioning at the next furnace chamber to be charged.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2008 008 291.0 | Feb 2008 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2009/000460 | 1/24/2009 | WO | 00 | 10/20/2010 |
