The present invention relates to a converter slag stopping mechanism with easy and quick slide replacement, which belongs to the pig iron processing techniques.
Background of the Invention:
Convertor is a kind of steel making furnace with a cylindrical body. It is mounted on horizontal pedestal and can be rotated. Reducing the carry-over slag quantity during tapping is an important link in improving the quality of liquid steel and also a great challenge hindering the development of steel making for a long time. Currently, in the steel making by convertor, steel plants have the requirements on the quantity of slag entering the ladle. It is unavoidable that slag would be generated in steel making. As the specific gravity of slag is less than that of the liquid metal, slag floats on the top of the liquid steel and such slag is called the pre-slag. In the final phase of tapping, eddying effect will make the slag mix with the liquid steel and such slag is called the pro-slag. To optimize the slag stopping technologies, slag-stopping cap, slag-stopping ball, floating plug, pneumatic slag stopping, electromagnetic slag stopping, vacuum slag absorption, siphoning liquid steel tapping and a dozen of methods have been developed in China and foreign countries. However, these methods didn't achieve a desirable result with a low rate of slag stopping. Due to the fact that the slag-stopping mechanism works at the high-temperature smelting area, it will be easily deformed because of the extreme heating during the convertor blowing process. Frequent replacement of various parts must be made because the mechanism would be burned and can't be used anymore. Current convertor slag stopping mechanism has complex structure which is difficult and time-consuming for installation.
Reference is made to the Patent number CN202079248U, by Vermeegen, dated 23/05/2011, titled "Cast steel roll bottom-casting system". This invention provides a cast steel roll bottom-casting system comprising a bottom box, wherein the bottom box is connected with a central circle sand box; the central circle sand box is connected with an upper roll neck sand box; the upper roll neck sand box is connected with a dead head sand box; and the bottom box, the central circle sand box, the upper roll neck sand box and the dead head sand box are internally provided with a roll. The roll comprises an upper roll neck, a roll body and a lower roll neck, wherein the lower roll neck is connected with a central casting pipe; a

bottom-casting system is placed inside the central casting pipe; and the bottom-casting system is internally provided with a refractory brick. The cast steel roll bottom-casting system has the advantages that molten steel is injected smoothly, the sand grains, the foreign matters and the impurities in the molten steel float upwards easily and the like.
Another reference is made to the Patent application number 736/CHENP/2003, by SMS DEMAG AG dated 14/05/2003, titled "A Method of Producing Stainless Steels". The invention relates to a method for producing stainless steels, in particular steels containing chromium and chromium-nickel. The method is carried out in a melting device containing a metallurgical vessel, or in a melting device containing at least two vessels for supplying a steel-casting installation, an electric arc furnace process and an air-refining process taking place alternately in the two vessels. To improve the efficiency of a method of this type, the aim of the invention is to carry out a reversible treatment of unreduced converter slag in the electric arc furnace mode. To achieve this, in the first treatment stage, the slag with a high chromium content is melted together with the added charge, the slag is then reduced during the melting process with the silicon and carbon under favourable thermodynamic conditions of the arc, once the slag has reached a minimum temperature of 1,490 °C and the slag is subsequently removed. The air-refining process is then carried out, during which the carbon content is reduced to a value of less than 0.9 %. The metal slag is tapped at a tapping temperature of between 1,620 and 1,720 °C, the unreduced slag with a high chromium content from the air-refining process remaining in the treatment vessel.
Another reference is made to the Patent application number 3331/MUM/2012, by Dinesh S. Shukla dated 20/11/2012, titled "A Graphitic Cast Iron Composition (Crucible) For Complete Aluminium Melting Process of Aluminium Scrap Using Medium Frequency Induction Furnace with Graphitic Cast Iron Pot/Silicon Carbide Pot/Graphite Pot". A Complete Melting Process of aluminium scrap using medium frequency induction furnace for production of different grades of Aluminium and Aluminium Alloys as suitable for automobile industries, die caster (GDC,PDC,LPDC), sand casting, permanent mould casting, extrusion etc, comprising the following steps: Cleaning and charging, clean scrap and/ or Pure Ingot and / Alloying Metal, Virgin Aluminium / Scrap in which added a Pure Cu, Si, Mn, Ti & Cr With Initial Charging, Late additions of Mn, Ti, Cu, Si, Ni & Cr is Added

as Pure Metal with help of squirrel cage arrangement (if required for composition setting). Also process of Degassing, Fluxing, Flushing & Structure Modification is possible. The melting process is suitable for intermittent operation as well as continues operations. All type of commercial scrap as well as processed dross can be melted with Induction Furnace. Generated Slag & Final disposal is neutral in nature. This process is clean and provides Carbon Credit due to low pollution.
Another reference is made to the Patent application number 2543/MUMNP/2014, by BAOSHAN IRON & STEEL CO. LTD dated 29/06/2012, titled "Control Method and Apparatus for Continuous Casting Steel Pouring". A control method for continuous casting steel pouring. The method comprises: 1. measuring and reading a ladle casting location signal by using a ladle location sensor mounted on a ladle rotary table; 2. determining in a steel pouring optimization control computer whether the steel pouring of the ladle starts; 3. feeding steel slag measurement data back to an inference controller by using a steel slag measurement sensor mounted above a ladle slide gate nozzle; 4. in the inference controller comparing the read steel slag measurement data with a manually set steel slag value; if the steel slag measurement data is smaller than the manually set steel slag value returning to a previous step; and if the steel slag measurement data is greater than the manually set steel slag value outputting and feeding a cylinder control variable to a PI controller; and 5. in the PI controller comparing a fed in cylinder location signal with an actually measured cylinder location signal and performing calculation and outputting to control a cylinder driving unit to push a cylinder to move so as to make the opening degree of the ladle slide gate nozzle smaller. An apparatus for continuous casting steel pouring using the above control method is further provided. By means of the above method and apparatus the amount of the molten steel flow of the ladle is controlled thereby improving the yield of the molten steel and decreasing the production cost.
Another reference is made to the Patent application number 850/MUM/2010, by JSW STEEL LIMITED dated 25/03/2010, titled "A Method of Controlled Ramping of Tundish Weight for Reduced Emulsification and A System Thereof". The invention relates to a method for weight-based auto ramping of liquid steel in tundish during ladle change over adapted to reduce emulsification by controlled slow rate of steel filling and a system to implement the method. The method involves low filling rate of steel as a function of the ladle through put and result in ladle filling to desired

level in 12-15 minutes time avoiding turbulence in liquid steel and minimizing silica inclusion or slag entrapment, ensuring improved cleanliness and quality of cast steel. The system of the invention is having PLC based control of pneumatically operating/opening slide gate for steel filling in tundish favoring automatic weight-based filling up to a safe level. The auto ramping of tundish is thus capable of wide industrial application in steel industry with less defects and rejections of change over slabs in continuous casting, with improved productivity at less cost in a safe and reliable manner.
Another reference is made to the Patent application number 9141/DELNP/2014, by JFE STEEL CORPORATION dated 30/11/2012, titled "Method for Manufacturing High Purity Steel Casting and Tundish". A tundish provided with a weir having a wall part and an eaves-shaped part projecting horizontally at the upper edge part of the wall part i s used to float up and separate inclusions i n molten steel in a more reliable and effective manner than in the past. A tundish provided with a weir having a notch at one or more locations, and having a wall part that extends up - ward so as to surround the molten metal injector : from four directions, and further having an eaves-shaped part that projects horizontally at the upper edge part of the wall part, the weir being positioned between a molten steel injector and a molten steel tap hole, i s used to continuously cast steel castings within a range in which the molten steel bath surface height (H) and the flow rate (Q) at which the molten steel i s injected into the tundish satisfy formula, where i s the weir height, S is the area of the upper opening part, L is the distance from the distal end of the eaves-shaped part to the short- side surface of the tundish, and W is the distance from the distal end of the eaves-shaped part to the long- side surface of the tundish.
Another reference is made to the Patent application number 602/KOLNP/2015, by JFE STEEL CORPORATION dated 30/10/2012, titled "Sliding shutter for tank with metal melt". When manufacturing molten steel from hot metal using a two base converter-type refining furnace and using one as a hot metal pre-treatment refining furnace and the other as a hot metal decarburization refining furnace, the molten slag generated in the decarburization refining furnace is used while still hot as a refining agent in the pre-treatment refining furnace without compromising the productivities of the two refining furnaces. A refining method for manufacturing molten steel from hot metal using a converter type refining furnace

with at least two bases and using one as a hot metal pre-treatment refining furnace and using the other as a decarburization refining furnace for the hot metal pre-treated in the pre-treatment refining furnace. After the molten steel obtained by decarburization refining in the decarburization refining furnace has been tapped in a ladle, the slag remaining inside the decarburization refining furnace is allowed to flow down, still in the molten state from above stacked iron scraps to solidify at least a portion of the slag. Then in pre-treatment of hot metal in the pre-treatment refining furnace, the slag, at least a portion of which has been solidified, is used together with the iron scraps while still hot.
Another reference is made to the Patent number RU2461444C2, by Verner Keller dated 16/07/2007, titled “Sliding shutter for tank with metal melt”. This invention provides a vane gate for containing a molten metal vessel, comprising guided in the sliding body sliding vane unit with a pushing rod which is designed to connect via a clutch with a drive rod of the linear drive while on the sliding body provided for receiving the push rod and drive rod on the side of the clutch holder for the linear drive, characterized in that the holder is provided with automatically acting locking device for the linear drive and automatically acting locking device for the push rod of the sliding block.
Another reference is made to the Patent number JP4734405B2, by Albert Gauche, Dominic Barrel and William Rose dated 10/03/2005, titled “Linear sliding gate valve for a metallurgical vessel”. This invention provides a fixed plate having a slide plate and a second orifice having a first orifice, Said slide plate supports a slide said slide plate with respect to the fixed plate, the relative positions of the first and the second orifice and orifice, includes a slidable tray and adapted to control the flow to the outside from the metallurgical vessel, wherein the slide plate is rotatable relative to said slidable tray Yes, The ratchet mechanism for determining the position of a predetermined rotational angle direction of the slide plate and further comprising, in the linear sliding gate valve for the metallurgical vessel, Characterized in that to form the fixed frame of is attached to said slidable tray; said ratchet mechanism the slidable tray is a ratchet mechanism and, a linear sliding gate valve for the metallurgical vessel.
Another reference is made to the Patent number CA2721597A1, by Benno Steiner, Werner Keller and Truttmann dated 17/04/2008, titled “Closing plate and sliding
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closure on the spout of a receptacle for molten metal”. This invention provides a closing plate for a sliding closure on the spout of a receptacle for molten metal, especially of a converter, comprises an elongate refractory plate and a sheet metal jacket surrounding the same. The refractory plate has a sliding surface which can be braced with a sliding surface of a refractory closure plate interacting therewith or with a sliding surface of a refractory head part. The refractory plate has a tapering section which forms an angle with the sliding surface on at least one side delimiting the sliding surface, said tapering section being associated with a section of the refractory plate that projects beyond the sheet metal jacket. The closing plate according to the invention allows the risk of damage to the front faces of the refractory parts to be braced with each other to be substantially reduced during bracing of the parts with each other and/or during a relative adjustment of the refractory parts that are braced with each other.
Another reference is made to the Patent number KR20060126975A, by Warner Keller, dated 31/10/2003, titled “Sliding closing element, with coupling”. This invention provides a sliding closing element, especially for an intermediate distributor or similar metallurgical containers. According to the invention, the mobile sliding plate of said closing element can be driven by means of a drive comprising a driving rod and a push rod connected thereto. In order to ensure that the oscillatory movement of the sliding plate does not impair the connection during operation, a coupling arranged as a connecting body between the opposite ends of the push rod and the driving rod is provided with two coupling parts that engage in each other without play.
Another reference is made to the Patent number EP2226140A1, by Vesuvius Group SA, dated 18/02/2009, titled “Actuating device for a slide gate valve for the casting of molten metal”. This invention provides a drive device of a control valve for casting liquid metal, comprising a main rod for controlling the opening and closing of the valve, and means coupling the main rod to the valve, characterized in that it further comprises means for controlling the coupling means capable of activating and deactivating the coupling means.
Reference is made to the Patent application number CN103451358A, by Yang Wei and Yang Yufu, dated 31/05/2012, titled “Slag-blocking steel-tapping device for revolving furnace”. The invention discloses a slag-blocking steel-tapping device
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for a revolving furnace. The slag-blocking steel-tapping device includes a connecting plate, a mounting plate and a door frame. Both sides of the upper face of the connecting plate are each provided with a guiding positioning hook, a positioning column and a swing bolt; both sides of the mounting plate are each provided with a hook shaft and half of a groove hole, and the mounting plate is embedded onto the connecting plate through the positioning columns; the door frame is connected with the mounting plate through a door frame hinge pin, sliding bars are arranged in the door frame, sliding frames can sliding located in the door frame respectively along the sliding bars, and the interior of each sliding frame is provide with a spring box; the interiors of the sliding frames are also provide with a sliding slide plate brick and a sliding water gap brick, and the sliding slide plate brick and the sliding water gap brick are respectively provided with a steel flowing hole; the mounting plate is provided with a fixed slide plate brick, and the sliding slide plate brick, the sliding water gap brick and the fixed slide plate brick perform relative motion.
Another reference is made to the Patent application number CN103525973A, by Wan Lixin, Zhao Jizeng, Wang Zhengfeng, Zhao Feng, Zhao Antang and Sun Xingqi, dated 30/09/2013, titled “Converter mechanism for slag blocking and steel tapping through sliding plates”. The invention discloses a converter mechanism for slag blocking and steel tapping through sliding plates. A fixed frame is fixed on a connecting plate, an opening and closing frame is connected to the fixed frame through a hinge pin roll, a sliding frame is arranged inside the opening and closing frame, slidable sliding rails and fixed sliding rails are correspondingly arranged on two sides of the sliding frame and the opening and closing frame respectively, an inner nozzle brick is installed inside the fixed frame and pressed tightly by an inner nozzle pressing plate, an inner sliding plate brick is installed inside the fixed frame, an outer sliding plate brick is installed inside the sliding frame, an outer nozzle brick is installed inside an outer nozzle base and pushed against tightly by an outer nozzle pusher, and a driving device is located at the top of the sliding frame and connected with the sliding frame through a pin roll.
Another reference is made to the Patent application number 8779/CHENP/2012, by SMS SIEMAG AG, dated 19/03/2010, titled “Device and Method for Closing an Outflow Opening of a Metallurgical Vessel”. The invention relates to a device and a method for closing an outflow opening of a metallurgical vessel. The device
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comprises a stopper rod which is arranged in the vessel above the outflow opening for closing the outflow opening a stopper rod mechanism for raising and lowering the stopper rod and a sensor for sensing oscillations of the stopper rod or the stopper rod mechanism. To detect the point in time for closing the outflow opening of the metallurgical vessel at as early a time as possible and to achieve an optimum separation between molten material and slag the device has a controller for activating the closing means for the outflow opening of the vessel depending on the factor of the oscillations at the stopper rod or at the stopper rod mechanism that are sensed by the sensor.
Another reference is made to the Patent application number CN101139640A, by Yan Yang, Yang Yufu, Wang Likun, Wang Wenli and Cai Yonghua, dated 25/09/2007, titled “Revolving furnace tap hole sliding gate slag-fending valve apparatus”. The invention provides a gate valve mechanism at a slide water gap at a tap hole of a converter, pertains to a steel-making machine, and is characterized in that semi-circular slots on an installation board are correspondingly inserted into positioning columns and positioning piles on a connection board, so reliable positioning is achieved; hold-down blind spring grooves with through bolt holes are provided at left and right side of a door frame, in each hold-down blind spring groove, hold-down springs and hold-down spring platens with through bolt holes are provided; the door frame and the hold-down spring platens pass through long hold-down bolts and are mounted rotatably on the installation board; at the bottom boards at the left and right inner side of the door frame, draw slips are provided; at the upper and lower part of the left and right outside of the slide frame, contact rollers are placed; rotating tightly the long hold-down bolts, the pressure will act on the contact rollers and the slide frame, so that the contact surfaces between sliding slide-board bricks and fixed slide-board bricks contact closely, which ensures very good air tightness and guarantees no steel and slag leakage; in addition, at the left and right side of the installation board, locking devices and hinging hooks are symmetrically arranged in vertical way for installing and dismounting oil cylinder, which allows rapid and reliable dismounting on line.
Another reference is made to the Patent application number CN202139256U, by Wu Baozhong, Wu Qiang, Zhang Qingping, Zhang Hong, Zhang Xiang and Maurobo, dated 30/06/2011, titled “Slag-blocking gate valve mechanism for steel-9

tapping hole of converter”. The utility model relates to a slag-blocking gate valve mechanism for a steel-tapping hole of a converter. The slag-blocking gate valve mechanism comprises a fixing frame, a switching frame, a sliding frame, a fixed sliding plate brick, a movable sliding plate brick both, an outer nozzle brick, an outer nozzle fixing frame, and an outer nozzle mounting frame, wherein the middle parts of the fixed sliding plate brick and the moveable sliding plate brick are provided with holes; the fixing frame and the switching frame are arranged from the top to the bottom and are connected with each other through a pin shaft; the sliding frame is arranged in the switching frame; the fixed sliding brick is fixed in the fixing frame; the movable sliding plate brick and the outer nozzle brick are fixed in the sliding frame from the top to the bottom; the upper surface and the lower surface of the movable sliding brick are respectively contacted with the fixed sliding plate brick and the outer nozzle brick; to sliding guide rail on the lower surface of the sliding frame is contacted with a fixed guide rail on the upper surface of the switching frame; an outer nozzle mounting frame fixed on the sliding frame is arranged between the switching frame and the outer nozzle brick; and the outer nozzle fixing frame is arranged between the outer nozzle mounting frame and the recess of the outside diameter of the lower part of the outer nozzle brick. The structure can be staggered in a sliding way through two sliding plate bricks with holes; and the steel-tapping hole is opened or closed to block the slag and discharge the steel.
Another reference is made to the Patent application number 6178/CHE/2013, by ABB Technology Ltd, dated 31/01/2014, titled “An Apparatus and A Method for Handling Molten Medium in Continuous Casting Process”. The present invention relates to an apparatus for handling molten medium in a continuous casting process. The apparatus comprises of a regulator for regulating the molten medium with electromagnetic stirrer for effecting stirring in the molten medium electromagnetically and electromagnetic brake for effecting braking in the molten medium electromagnetically. The invention also relates to a method for handling molten medium in a continuous casting process. The method comprises the steps of effecting stirring and braking in the molten medium electromagnetically.
Another reference is made to the Patent application number US4776083A, by Manabu Sakamoto, Satoshi Tatsuta, Akira Murata, Natsuki Namura, Shigeki Tamada, Yoshinori Kawasaki and Norio Misaki, dated 22/03/1986, titled
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“Apparatus for mounting a siphon tapping tube onto a converter vessel”. This invention provides an apparatus for mounting a siphon tapping tube onto a tap hole mounting part of a converter vessel has a lower car and an upper car, which are placed on a ladle car which travels beneath a converter vessel, the lower car and the upper car being capable of travelling in the direction of the travel of the ladle car and in the direction perpendicular to that of the travel of the ladle car, respectively, a loading table mounted on the upper car, which is guided by an upright support frame and being capable of moving upward and downward with a siphon tapping tube loaded on the table, and bolt tightening and untightening units which are provided on the loading table in positions corresponding to the respective bolt hole set positions in the flange of the siphon tapping tube and are capable of receiving mounting bolts. TV camera is provided on the upper car, allowing the operator to monitor the tap hole mounting part.
Another reference is made to the Patent application number 67/KOL/2014, by Mitra Mazumder Subhajit, Satya Prakash, Tiwari Satyendra Nath, Agrawal Roopak and Choubey Mukteshwar, dated 16/01/2014, titled “A System for Stabilization of Steel Making (BOF) Slag Through Hydration Treatment and A Method of Such Stabilization”. The present invention relates to a system for stabilization of Steel Making (BOF) slag through hydration treatment using saturated steam and method for such stabilization. More particularly, the present invention is directed to provide a system for accelerated primary stabilization of BOF slag using steam as medium of stabilization through hydration, by introduction of saturated steam at predetermined pressure and temperature into a pressure vessel such as to induce penetration of steam into the slag sample and thereby stabilize the slag. The system and method to stabilize Steel Making (BOF) slag monitors the progress of the hydration reaction through surrogate parameters of pH and alkalinity which when stabilized can be used as indicator of end point of reaction and therefore can be used as an indicator of stabilization of BOF slag involving the stabilization of free lime at reduced level avoiding the conventional technical limitation of expansion of BOF slag and thus rendering the slag suitable for further use/reuse for variety of applications.
Another reference is made to the Patent application number 3485/KOLNP/2011, by JFE Steel Corporation, dated 24/07/2009, titled “Method for Desulfurizing Hot Metal”. The present invention relates to a method for desulfurizing hot metal
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includes stirring hot metal to which a desulfurization agent has been added to scatter the desulfurization agent and desulfurize the hot metal, wherein the addition of the desulfurization agent to the hot metal is divided into multiple additions; and, in at least one addition among second and subsequent additions of the desulfurization agent, the desulfurization agent is added to slag caused to float to a surface of the hot metal by temporarily stopping the stirring or temporarily reducing a stirring force, thereby the reaction efficiency of the desulfurization agent added is improved. Preferably, a dipping depth of an impeller is decreased when the slag is caused to flow and the impeller is moved down when the slag caused to float is drawn into the hot metal.
Another reference is made to the Patent application number 1324/DELNP/2015, by Beijing Guodian Futong Science and Technology Development Co. Ltd., dated 25/07/2012, titled “Biomass Boiler Slag Treatment System and Process”. The present invention relates to a biomass boiler slag treatment system and a process therefor. The biomass boiler slag treatment system comprises: a slag through, a slag transport apparatus and a burning apparatus. The burning apparatus is sealed provided between the slag trough and the slag transport apparatus and is able to move horizontally. The burning apparatus is controlled to be closed and then slag falls down the slag trough onto the re burning apparatus achieving the re burning of carbon in the slag with the heat produced by the combustion of carbon in the slag being returned to the hearth. The re burning apparatus is controlled to be opened and then slag falls onto the slag transport apparatus and is discharged. The biomass boiler slag treatment process comprises: closing the re burning apparatus vibrating slag by means of a grate to fall onto the burning apparatus stopping vibrating the grate and re burning carbon in the slag on the re burning apparatus and then returning the heat produced to the hearth; opening the re burning apparatus such that the slag falls onto the slag transport apparatus and is discharged; and repeating the above mentioned steps to achieve re burning of carbon in the slag and recovery of heat. By burning incompletely burnt carbon in the slag through the re burning apparatus slag heat recovery is achieved and boiler efficiency is improved.
However, none of the above discussed inventions provide an improved convertor slag stopping system with a mechanism for easy replacement of slide plate, said system comprising of a fixed frame, sliding frame,
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opening/closing frame, spring box and bolts, such that said sliding frame is set between the fixed frame and the opening/closing frame; said mechanism comprising a slide plate which is movable in back and forth position relative to said fixed frame, such that opening/closing frame, spring box and the fixed frame are solidly jointed by said bolts penetrating them, so when the slide plate needs to be replaced, the above three can be disassembled only by unscrewing the bolts, which substantially saves the time in replacing the slide plate.
Objects of the invention:
The main objective of the present invention is to provide a converter slag stopping mechanism with easy and quick slide replacement.
Another objective of the present invention is to control the flow of metal casting.
Another objective of the present invention is to minimize a risk of breakout accident during operation.
Another objective of the present invention is to minimize the risk of steel re-oxidation.
Summary of the invention:
The present invention provides a converter slag stopping mechanism with easy and quick slide replacement which includes the fixed frame, sliding frame, spring box and opening/closing frame. The sliding frame is set between the fixed frame and the opening/closing frame, and the sliding frame can move back and forth relative to the fixed frame. The sliding frame is provided with a spring box at its front end, which is placed between the fixed frame and the opening/closing frame. The spring box includes the spring pressing plate and the springs between the plate and the fixed frame. The spring pressing plate has a contact with the lower surface of the opening/closing frame. The opening/closing frame, spring box and the fixed frame is solidly jointed by the bolt penetrating them.
Statement of the invention:
Accordingly, the present invention provides an improved convertor slag stopping system with a mechanism for easy replacement of slide plate, said system comprising of a fixed frame, sliding frame, opening/closing frame, spring box
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and bolts, such that said sliding frame is set between the fixed frame and the opening/closing frame; said mechanism comprising a slide plate which is movable in back and forth position relative to said fixed frame, such that opening/closing frame, spring box and the fixed frame are solidly jointed by said bolts penetrating them, so when the slide plate needs to be replaced, the above three can be disassembled only by unscrewing the bolts, which substantially saves the time in replacing the slide plate.
Detailed description of Figures:
Figure 1 shows a structural schematic diagram of the converter slag stopping mechanism with easy and quick slide replacement. Where referral numerals are follows:
1-fixed frame; 2-sliding frame; 3-opening/closing frame; 4-bolt; 5-spring pressing plate; 6-No.1 through-hole; 7-No.2 through-hole; 8-compression spring; 9-blind hole.
Detailed description of the invention:
It should be noted that the particular description with features, designs, components, construction, working and embodiments set forth in the specification below are merely exemplary of the wide variety and arrangement of instructions which can be employed with the present invention. The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. All the features disclosed in this specification may be replaced by similar other or alternative features performing similar or same or equivalent purposes. Thus, unless expressly stated otherwise, they all are within the scope of present invention. Various modifications or substitutions are also possible without departing from the scope or spirit of the present invention. Therefore, it is to be understood that this specification has been described by way of the most preferred embodiments and for the purposes of illustration and not limitation.
The present invention provides an improved convertor slag stopping system with a mechanism for easy replacement of slide plate which includes a fixed frame, a sliding frame, a spring box and an opening/closing frame. The sliding frame is set between the fixed frame and the opening/closing frame, and the sliding frame can
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move back and forth relative to the fixed frame and the sliding frame is provided with a spring box at its front end, which is placed between the fixed frame and the opening/closing frame. The spring box includes the spring pressing plate and the springs between the plate and the fixed frame. The spring pressing plate has a contact with the lower surface of the opening/closing frame. The opening/closing frame, spring box and the fixed frame is solidly jointed by the bolt penetrating them.
There are at least two bolts, which are evenly distributed and the bolt is manufactured with external thread. The opening/closing frame and spring box are properly provided with through-holes for the bolts and a blind hole is set on the fixed frame corresponding to the through-hole, these through-holes and blind holes are all made with the internal thread matching with the external thread and the bolts penetrate through the through-holes of the fixed frame and the spring box to get connected with the blind hole.
The spring inside the spring box is a compression spring and there are at least two evenly distributed springs. Further, slideways are set on both side of the sliding frame for its sliding.
The spring inside the spring box is compression spring and there are at least two evenly distributed springs and slideways are set on both side of the sliding frame for its sliding.
The present invention discloses an improved convertor slag stopping mechanism with easy and quick replacement of slide plate comprises a fixed frame (1), a sliding frame (2), spring box and an opening/closing frame (3), wherein the sliding frame (2) is set between the fixed frame (1) and the opening/closing frame (3) and slideways are provided at both sides of the sliding frame (2) for its sliding movement and sliding frame (2) can make shuttling motion relative to the fixed frame (1).
A spring box is set at the front end of the sliding frame (2), and it is placed between the fixed frame (1) and the opening/closing frame (3). The spring box include the spring pressing plate (5) and seven compression springs (8) uniformly distributed between the spring pressing plate (5) and the fixed frame (1). The spring pressing plate (5) is pressed against the lower surface of the opening/closing frame (3).
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This mechanism adopted in this embodiment also has two bolts (4) with external thread. Corresponding positions of the opening/closing frame (3) and the spring box are respectively provided with the No.1 through-hole (6) and No.2 through-hole (7) for the pass of the bolt (4). Two blind holes (9) are set at the positions of the fixed frame corresponding to No.1 through-hole (6) and No. 2 through-hole (7); the blind holes (9), No.1 through-hole (6) and No.2 through-hole (7) all have internal thread matching with the external thread. The bolt (4) is connected to the blind hole (9) by running through the No. 1 through-hole (6) and No.2 through-hole (9) in order to fix the opening/closing frame (3) and the spring box on the fixed frame (1). The two bolts (4) are set in symmetry.
For the convertor slag stopping mechanism with easy and quick replacement of slide plate, the opening/closing frame (3), the spring box and the fixed frame (1) is solidly jointed by the bolt (4) penetrating them, the above three can be disassembled only by unscrewing the same bolt when the slide plate needs to be replaced, which will substantially save the time in replacing the slide plate. Meanwhile, as the front end of the sliding frame (2) is provided with the spring box in which the spring pressing plate (5) is tightly pressed against the lower surface of the opening/closing frame (3) due to the elastic force of the seven compression springs (8), thus ensuring the stable surface compression between the slide plate and the fixed frame (1), when the sliding frame (2) is doing the shuttling motion. The slideways provided at both sides of the sliding frame (2) also make the movement more precise and stable.
So, accordingly in the preferred embodiment, the present invention discloses an improved convertor slag stopping system with a mechanism for easy replacement of slide plate, said system comprising of a fixed frame (1), sliding frame (2), opening/closing frame(3), spring box and bolts (4), such that said sliding frame (2) is set between the fixed frame (1) and the opening/closing frame (3); said mechanism comprising a slide plate which is movable in back and forth position relative to said fixed frame (1), such that opening/closing frame (3), spring box and the fixed frame (1) are solidly jointed by said bolts (4) penetrating them, so when the slide plate needs to be replaced, the above three can be disassembled only by unscrewing the bolts (4), which substantially saves the time in replacing the slide plate.
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In another embodiment, said bolts are at least two in number, which are uniformly arranged.
In yet another embodiment, said sliding frame is provided with said spring box at its front end which is set between the fixed frame and opening/closing frame.
In yet another embodiment, said spring box includes a spring pressing plate and the springs between said plate and said fixed frame.
In another embodiment, said spring pressing plate has a contact with the lower surface of the opening/closing frame such that the opening/closing frame, spring box and the fixed frame is solidly jointed by the bolt penetrating them.
In yet another embodiment, said bolts are manufactured with external thread, and the opening/closing frame and spring box are properly provided with through-holes for said bolts; a blind hole is set on the fixed frame corresponding to the through-hole; the through-holes and blind holes are all made with the internal thread matching with the external thread; the bolts penetrates through the through-holes of the fixed frame and the spring box to get connected with the blind hole.
In another embodiment, said spring inside the spring box is compression spring and there are at least two evenly distributed springs.
In another embodiment, said slideways are set on both side of the sliding frame for its sliding.
Advantages:
• As the fixed frame, spring box and opening/closing frame is jointly
connected by a bolt penetrating them, so when the slide plate needs to be
replaced, the above three can be disassembled only by unscrewing the
same bolt, which will substantially save the time in replacing the slide plate;
• As the sliding frame is provided with a spring box at its front end and the
spring pressing plate will press against the lower surface of the
opening/closing frame due to the elastic force, a stable face compression
can be ensured between the slide plate and the fixed frame when the sliding
frame is doing reciprocating motion;
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• As the spring inside the case is compression case and there are at least two evenly distributed springs, the intensity of the elastic force can be maintained in a stable way and
• As slideways are installed on the two sides of the sliding frame, more stable and precise movement of the sliding frame can be achieved.
• More than 99% slag can be eliminated. The slag thickness in the ladle is no more than 40mm (excluding synthetic slag).
• The slag stopping system operates stably and reliably. Conforming to safety and technological requirement, the accident rate is controlled within 1%.
• The closing speed of the slide gate system is no more than 0.75s.
• Efficiently, the replacement time of the slide gate plate is less than 15min/times (Excluding nozzle brick change).
• Under normal circumstance, the service life of the slide gate plate and the outer slide gate is over 12 times, averagely (without liquid steel flow control function).
• The inner slide gate can be used for over 40 times for synchronous replacement with tap hole. The separate replacement can be conducted for over 24 times' application.

We claim:

An improved convertor slag stopping system with a mechanism for easy replacement of slide plate, said system comprising of a fixed frame (1), sliding frame (2), opening/closing frame (3), spring box and bolts (4), such that said sliding frame (2) is set between the fixed frame (1) and the opening/closing frame (3); said mechanism comprising a slide plate which is movable in back and forth position relative to said fixed frame (1), such that opening/closing frame (3), spring box and the fixed frame (1) are solidly jointed by said bolts (4) penetrating them, so when the slide plate needs to be replaced, the above three can be disassembled only by unscrewing the bolts (4), which substantially saves the time in replacing the slide plate.
The improved convertor slag stopping system with a mechanism for easy replacement of slide plate as claimed in claim 1, wherein said bolts (4) are at least two in number, which are uniformly arranged. The improved convertor slag stopping system with a mechanism for easy replacement of slide plate as claimed in claim 1, wherein said sliding frame (2) is provided with said spring box at its front end which is set between the fixed frame (1) and opening/closing frame (3).
The improved convertor slag stopping system with a mechanism for easy replacement of slide plate as claimed in claim 1, wherein said spring box includes a spring pressing plate (5) and the springs between said plate and said fixed frame (1).
The improved convertor slag stopping system with a mechanism for easy replacement of slide plate as claimed in claim 1, wherein said spring pressing plate (5) has a contact with the lower surface of the opening/closing frame (3) such that the opening/closing frame (3), spring box and the fixed frame (1) is solidly jointed by the bolt (4) penetrating them.
The improved convertor slag stopping system with a mechanism for easy replacement of slide plate as claimed in claim 1, wherein said bolts (4) are manufactured with external thread, and the opening/closing frame (3) and spring box are properly provided with through-holes (6,7) for said bolts (4); a blind hole (9) is set on the fixed frame (1) corresponding to the through-

hole (6,7) ; the through-holes (6,7) and blind holes (9) are all made with
the internal thread matching with the external thread; the bolts (4)
penetrates through the through-holes (6,7) of the fixed frame (1) and the
spring box to get connected with the blind hole (9).
The improved convertor slag stopping system with a mechanism for easy
replacement of slide plate as claimed in claim 1, wherein said spring (8)
inside the spring box is compression spring and there are at least two evenly
distributed springs.
The improved convertor slag stopping system with a mechanism for easy
replacement of slide plate as claimed in claim 1, wherein said slideways are
set on both side of the sliding frame (2) for its sliding.