Field of the invention
The present invention relates to a ladle slide gate mechanism capable of improving the locking safety of the slide plate and it belongs to the technical field of metal casting.
Background of the Invention
The ladle slide gate is an important system for controlling the liquid steel flow rate from the ladle. If the system encounters a breakout accident during operation, it will cause strand breaking and even burning out of the continuous casting machine and other malignant production accidents, which would disturb the stability of production and pose a serious threat to the safety of human and equipment. In respond to the ever-faster casting speed and as higher requirements are put forward for accelerating the turnover of ladle and reducing production accidents, the safe operation of the slide gate become a prerequisite. Generally, breakout is more frequent on small ladles. Reducing or avoiding breakout accident from slide gate is of great significance for the steelworks with faster and faster production pace.
The slide locking mechanism of the existing ladle slide gate adopts a right-angled slider and the slider is in surface contact with the wall of the frame. Due to the differentiated sizes and angular error of the slides or thermal deformation of the frame, it is often impossible to lock the slide plate.
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 201617028237, by POSTECH ACADEMY INDUSTRY FOUNDATION and CHOSUN REFRACTORIES CO. LTD. dated 06/02/2014, titled "SLIDE GATE AND VALVE PLATE FOR SLIDE GATE". The present invention discloses that a valve plate for a slide gate that is located between a ladle and a turndish to control the flow rate of molten steel. The valve plate for a slide gate has a heptangular shape including: first and second long sides facing and parallel to each other; first and second inclined short sides making contact with the first and second long sides, respectively, at one end thereof; a third short side connecting the first and second short sides; and fourth and fifth inclined short sides making contact with the first and second long sides, respectively, at the other end thereof. The valve plate for a slide gate is symmetrical with respect to the center line thereof that is spaced the same distance apart from the first and second long sides and parallel thereto, and has an orifice formed on the center line.
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 201814013720, by Hazelett Strip-Casting Corporation dated 11/04/2017, titled "System and Method for Continuous Casting". A continuous casting apparatus includes a first belt carried by a first upstream pulley and a first downstream pulley, a second belt carried by a second upstream pulley and a second downstream pulley, and a mold region defined by a first mold support section arranged behind the first belt and a second mold support section arranged behind the second belt. The first mold support section supports the first belt and defines a shape of the first belt in the mold region and the second mold support section supports the second belt and defines a shape of the second belt in the mold region. At least one of the first mold support section and the second mold support section includes a transition portion and a generally planar portion downstream from the transition portion. The transition portion has a variable radius configured to receive molten metal from a metal feeding device.

Another reference is made to the Patent application number 201737000384, by Foseco International Limited dated 02/09/2014, titled "Feeder System". The present invention relates to a feeder system for metal casting. The feeder system comprises a feeder sleeve mounted on a tubular body. The feeder sleeve has a longitudinal axis and comprises a continuous sidewall that defines a cavity for receiving liquid metal during casting. The sidewall extends generally around the longitudinal axis and has a base adjacent the tubular body. The tubular body defines an open bore therethrough for connecting the cavity to the casting. A groove extends into the sidewall from the base to a first depth and the tubular body projects into the groove to a second depth and is held in position by retaining means. The second depth being less than the first depth so that upon application of a force in use the retaining means are overcome and the tubular body is pushed further into the groove.
Another reference is made to the Patent application number 201617025949, by Vesuvius Group SA dated 19/02/2014, titled "Ladle Shroud for Casting Metal Kit of Parts for Coupling Assembly for Coupling Said Ladle Shroud to A Ladle Metal Casting Installation and Coupling Process". The present invention concerns a metal casting installation comprising a ladle comprising an inner nozzle in fluid communication with the through opening of a top gate plate and equipped with a ladle shroud coupling assembly comprising: (a) a support frame comprising a bottom gate plate and a passage said support frame being sliding coupled to a planar bottom surface of the top gate plate such that the opening of the bottom gate plate can be brought in or out of registry with the through opening of the top gate plate (b) a drawer frame inserted in the passage of the support frame such that the drawer frame can be moved back and forth through said passage (c) first and second latches resiliency mounted such that they can move from a coupling position to a loading position (d) a specifically designed ladle shroud comprising a bore and gripping means suitable for being reversibly coupled to the first and second latches wherein the drawer frame by moving through the passage of the support frame can bring the bore of the ladle shroud alternatively in and out of registry with the opening of the bottom gate plate.
Another reference is made to the Patent application number CN108160982A, by Yang Rui, Zhao Rongjie, Wu Jianjun, Liang Quan, Sun Zhiqing and Yu Bin dated 09/02/2018, titled "Steel ladle sliding nozzle device". The invention discloses a

steel ladle sliding nozzle device. Compression spring sets are arranged at the positions, close to the outer edge, of the two sides of a clamping frame. Each of the two sides of the upper surface of the clamping frame is provided with a spring pressing plate. One ends of the compression spring sets make contact with the spring pressing plates, and the other ends of the compression spring sets make contact with the inner end face of spring counter bores of the clamping frame. The clamping frame is further provided with first pressing screws and pressing blocks. One ends of the first pressing screws are connected with the spring pressing plates, and the other ends of the first pressing screws are connected with the pressing blocks. The pressing blocks are connected with the fixing frame through second pressing screws. A full-thread structure tight jacking device is utilized for fixing and locking a lower water nozzle, and more safety and reliability are achieved. By adoption of the above technical scheme, constant and uniform pressure is constructed on an upper-lower sliding plate interface, and heat expansion changes are absorbed by the compression spring sets. A pressure transmission structure is more reasonable, evener and safer. Springs are far away from a high-temperature area, and the heat load is reduced to the maximum degree; and a forced air-cooling device is adopted, usage of the mechanism is safer and more reliable, and the service life is long.
Another reference is made to the Patent application number JP3355326B2, by Ikuo Kameya, Shinjiro Saito and Hiroyuki Tofu dated 25/02/1999, titled "Slide gate". A molten steel container a frame fixed to the bottom surface of the frame lower surface openably provided a guide frame, made from the frame and said guide frame is inserted and held in a space surrounded by the upper refractory plate and the lower refractory plate, the lower refractory in slide gate is slid objects plate controls the opening of the nozzle gate, on each side of the frame, receiving the spring extends in the sliding direction of the lower refractory plate the provided, receiving the springs coil springs to the upper surface. The spring case that interiors provided, at each end of each spring case, extends below the receiving the spring, for supporting the rollers, a pair of rollers receiving is provided, when closing the guide frame, at a position opposite to the spring case across the receiving the spring, which is movable by being guided by the guide frame, a pair of surface pressure bar , the connecting fitting of the surface pressure bar, by pressing the projection provided on the sliding block, the lower

refractory plate by extending the cylinder for sliding, The surface pressure bar rollers by engaging in, together with the connecting frame and guide frame, the surface pressure is loaded to the slide gate, said slide block ( wherein between the connecting fitting of the projection and the surface pressure bar provided, Hook the removable release jig connected to each other, said cylinder to contract, and the surface pressure bar is disengaged from said roller, Sliding gate which is characterized in that so as to release the contact pressure.
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 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 (10) 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 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.
Another reference is made to the Patent number EP2481500A1, by Benno Steiner and Reinhard Ehrengruber, dated 31/01/2011, titled "Cover plate and a sliding closure at the spout of a container containing a metal melt". This invention provides a plate for a sliding closure on the spout of a molten metal-containing vessel, wherein the two outer longitudinal sides, one on a central longitudinal axis

of the closure plate arranged in the flow opening and an outgoing from the latter closing surface are provided, characterized in that serving at these two outer longitudinal sides at least two as clamping surfaces or as a centring of the closing plate, shoulder surfaces are formed, which to the longitudinal axis a plate taper forming angles (a, B), and in that at least in the shoulder surfaces on the side of the closing surface subsequent outer sides are provided, which for longitudinal axis each having a smaller angle (y) than that of the shoulder surfaces comprise or are arranged approximately parallel to the longitudinal axis.
Another reference is made to the Indian Patent application number 708/DELNP/2015, by Sintokogio Ltd., dated 28/01/2015, titled "Pouring Device and Ladle for Pouring Device". This invention provides a pouring device for pouring molten metal into a mold by tilting a ladle comprising the ladle and a ladle tilting mechanism for tilting the ladle; the ladle having a storage part for storing molten metal and a molten metal heating part for heating the molten metal in the ladle the molten metal heating part being provided to the bottom part of the storage part whereby temperature decreases in the molten metal in the ladle can be prevented with a simple configuration and casting defects can be reduced.
Another reference is made to the Indian Patent application number 6825/DELNP/2015, by Almex USA Inc., dated 23/11/2013, titled "Process and Apparatus for Minimizing the Potential for Explosions in The Direct Chill Casting Aluminium Lithium Alloys". This invention provides an apparatus and a system including a casting pit; a mold including a reservoir and a cavity; a coolant feed operable to introduce a coolant to a periphery of a metal emerging from the mold cavity; an array of water vapor exhaust ports about at least the top periphery of the casting pit; a mechanism to introduce an inert fluid into the coolant feed. A method for a direct chill casting including after detecting a bleed out exhausting generated gas from the casting pit at a flow volume rate that is enhanced relative to a flow volume rate prior to detecting bleed out or run out; introducing an inert gas into the casting pit; and introducing an inert fluid into a coolant feed to the casting mold.
However, none of the above discussed inventions provide an improved locking mechanism for ladle slide gate, with improved locking safety of the slide plate, said mechanism comprising of a frame, a corner fixing

block, an adjusting bolt and a corner connecting block with two ends said two ends of said corner connecting block are symmetrically hinged with arc-shaped movable corner blocks and the arc faces of the two arc-shaped movable corner blocks respectively contact against the inner wall of said frame, said mechanism characterized in that the sectional shape of the frame is rectangular, the corner fixing block is rectangular and the corner connecting block is a strip.
Objects of the invention
The main objective of the present invention is to provide a ladle slide gate mechanism capable of reducing height.
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 ladle slide gate mechanism capable of improving the locking safety of the slide plate and it belongs to the technical field of metal casting. The ladle slide gate mechanism comprises a frame, a corner fixing block, an adjusting bolt and a corner connecting block. The adjusting bolt passes through the corner fixing block and is fixed on the upper part inside the frame, and the lower end of the bolt is connected to the upper end of the corner connecting block. The adjusting bolt can rotate along its own main shaft. The two ends of the corner connecting block are symmetrically hinged with arc-shaped movable corner blocks and the arc faces of the two arc-shaped movable corner blocks respectively contact against the inner wall of the frame. The upper end of the adjusting bolt is used for locking the slide plate. Because the contact surface of the arc-shaped movable corner block and the inner wall of the frame is a curved surface, when the size of the slide plate is not uniform or the frame is thermally deformed, the arc-shaped movable corner block can automatically change the contact outline with the inner wall of the frame and keep sliding gate locked, thus improving the safety for locking of the slide plate.

Statement of the invention
Accordingly, the present invention provides an improved locking mechanism for ladle slide gate, with improved locking safety of the slide plate, said mechanism comprising of a frame, a corner fixing block, an adjusting bolt and a corner connecting block with two ends said two ends of said corner connecting block are symmetrically hinged with arc-shaped movable corner blocks and the arc faces of the two arc-shaped movable corner blocks respectively contact against the inner wall of said frame, said mechanism characterized in that the sectional shape of the frame is rectangular, the corner fixing block is rectangular and the corner connecting block is a strip.
Brief Description of Drawing
Figure 1 shows a structural schematic diagram of the ladle slide gate mechanism capable of improving locking safety of the slide plate. Where referral numerals are follows:
1- Frame; 2- Arc-shaped movable block; 3- Corner fixing block; 4- Adjusting bolt; 5- Pin; 6- Corner connecting block.
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 locking mechanism for ladle slide gate, with improved locking safety of the slide plate, said mechanism comprising

of a frame (1), corner fixing block (3), adjusting bolt (4) and corner connecting block (6). The frame (1) has a rectangular cross section, the corner fixing block
(3) is a rectangular and the corner connecting block (6) is a strip. The adjusting bolt (4) is provided with external threads, and the corner fixing block (3) is provided with a through-hole suitable for passing through of the adjusting bolt
(4) in which internal threads matching the external threads of the adjusting bolt (4) is provided, and the adjusting bolt (4) passes through the corner fixing block (3) and is fixed on the upper part inside the frame (1) through the internal and the external threads.
The ladle sliding gate mechanism capable of improving the locking safety of the slide plate also comprises a bolt connecting block. The lower end of the adjusting bolt (4) is fixed with a sphere with diameter being twice the diameter of the adjusting bolt (4). The bolt connecting block is provided with a recess for fitting the sphere. The sphere is engaged in the recess and the adjusting bolt (4) can rotate along the main shaft through joint action of the sphere and the recess. The bolt connecting block is fixed to the middle of the upper end of the corner connecting block (6) through a positioning pin (5). The two ends of the corner connecting block (6) are symmetrically hinged with arc-shaped movable corner blocks (2) by the pin (5), and the arc surface of the two arc-shaped movable corner blocks 2 respectively contact against the inner wall of the frame (1). The upper end of the adjusting bolt (4) is used for locking the slide plate.
In the operation, when the size of the slide plate is not uniform, the angle error occurs or the frame is deformed by heat, the arc-shaped movable corner block (2) can rotate around the pin (5), automatically change the contact outline with the inner wall of the frame, and lock the slide plate. This improves the locking safety of the slide plate and provides a guarantee for the safe operation of the slide gate.
The present invention discloses a ladle slide gate mechanism capable of improving the locking safety of the slide plate through a locking mechanism. The locking mechanism comprises a frame (1), a corner fixing block (3), an adjusting bolt (4) and a corner connecting block (6). The adjusting bolt (4) passes through the corner fixing block (3) and is fixed on the upper part inside the frame (1) and the lower end of the bolt is connected to the upper end of the corner connecting block (6). The adjusting bolt (4) can rotate along its own main shaft. The two ends of

the corner connecting block (6) are symmetrically hinged with arc-shaped movable corner blocks and the arc faces of the two arc-shaped movable corner blocks respectively contact against the inner wall of the frame (1). The upper end of the adjusting bolt (4) is used for locking the slide plate.
In an improved locking mechanism for ladle slide gate, with improved locking safety of the slide plate, sectional shape of the frame (1) is rectangular.
An improved locking mechanism for ladle slide gate, with improved locking safety of the slide plate, the adjusting bolt (4) is provided with external threads, the through-hole for passing through of the adjusting bolt (4) is provided on the corner fixing block (3), and the internal threads which match with the external threads of the adjusting bolt (4) are provided in the trough-hole The corner fixing block (3) is connected on the upper part inside the frame (1) through the external and internal threads.
An improved locking mechanism for ladle slide gate, with improved locking safety of the slide plate, it has bolt connecting block and the adjusting bolt (4) is equipped with sphere, the diameter of which is greater than the diameter of the bolt. The bolt connecting block is provided with a recess for wrapping around the sphere to lock the sphere in the recess. The bolt connecting block is connected to the upper part of the corner connecting block (3).
An improved locking mechanism for ladle slide gate, with improved locking safety of the slide plate is characterized in that the corner fixing block (3) takes rectangular shape and the through-hole is located in the middle of the corner fixing block (3).
An improved locking mechanism for ladle slide gate, with improved locking safety of the slide plate is characterized in that the corner connecting block (6) is a strip in shape and fixed on the middle of the corner connecting block (6).
The beneficial effects of the present invention is that the contact surface of the arc-shaped movable corner block and the inner wall of the frame is a curved surface and the arc-shaped movable corner block is hinged with the corner connecting block (6), when the sizes of the slide plate is not uniform, the angle error occurs, or the frame is thermally deformed, the arc-shaped movable corner block can rotate around the hinge point, automatically change the contact outline

with the inner wall of the frame (1), lock the sliding plate, improve the locking safety of the slide plate, and provide a good basis for the safe operation of the slide gate.
So, accordingly in the preferred embodiment, the present invention discloses an improved locking mechanism for ladle slide gate, with improved locking safety of the slide plate, said mechanism comprising of a frame (1), a corner fixing block (3), an adjusting bolt (4) and a corner connecting block (6) with two ends said two ends of said corner connecting block (6) are symmetrically hinged with arc-shaped movable corner blocks (2) and the arc faces of the two arc-shaped movable corner blocks (2) respectively contact against the inner wall of said frame (1), said mechanism characterized in that the sectional shape of the frame (1) is rectangular, the corner fixing block (3) is rectangular and the corner connecting block (6) is a strip.
In an embodiment, said adjusting bolt is provided with external threads, and the corner fixing block is provided with a through-hole suitable for passing through of the adjusting bolt in which internal threads matching the external threads of the adjusting bolt are provided, and the adjusting bolt passes through the corner fixing block and is fixed on the upper part inside the frame through the internal and the external threads.
In another embodiment, said adjusting bolt passes through said corner fixing block and is fixed on the upper part inside said frame, and the lower end of said bolt is connected to the upper end of said corner connecting block.
In yet another embodiment, said adjusting bolt can rotate along its own main shaft.
In yet another embodiment, said upper end of the adjusting bolt is used for locking the slide plate.
In another embodiment, said ladle slide gate mechanism capable of improving the locking safety of the slide plate is characterized in that it has bolt connecting block and the adjusting bolt is equipped with sphere, the diameter of which is greater than the diameter of the bolt.
In yet another embodiment, said bolt connecting block is provided with a recess for wrapping around the sphere to lock the sphere in the recess.

In another embodiment, said bolt connecting block is connected to the upper part of the corner connecting block.
In yet another embodiment, said ladle slide gate mechanism capable of improving the locking safety of the slide plate is characterized in that the corner fixing block takes rectangular shape and the through-hole is located in the middle of the corner fixing block.
In another embodiment, ladle slide gate mechanism capable of improving the locking safety of the slide plate is characterized in that the corner connecting block is a strip in shape and fixed on the middle of the corner connecting block.

We Claim:
1.An improved locking mechanism for ladle slide gate providing highly strong
locking of the slide plate, said mechanism comprising of a frame (1), a
corner fixing block (3), an adjusting bolt (4) and a corner connecting block
(6) with two ends said two ends of said corner connecting block (6) are
symmetrically hinged with arc-shaped movable corner blocks (2) and the
arc faces of the two arc-shaped movable corner blocks (2) respectively
contact against the inner wall of said frame (1), said mechanism
characterized in that the sectional shape of the frame (1) is rectangular,
the corner fixing block (3) is rectangular and the corner connecting block
(6) is a strip.
2.The improved locking mechanism as claimed in claim 1, wherein said
adjusting bolt (4) is provided with external threads, and the corner fixing
block (3) is provided with a through-hole suitable for passing through of
the adjusting bolt (4) in which internal threads matching the external
threads of the adjusting bolt (4) are provided, and the adjusting bolt (4)
passes through the corner fixing block (3) and is fixed on the upper part
inside the frame (1) through the internal and the external threads.
3.The improved locking mechanism as claimed in claim 1, wherein said adjusting bolt (4) passes through said corner fixing block (3) and is fixed on the upper part inside said frame (1), and the lower end of said bolt (4) is connected to the upper end of said corner connecting block (6).
4. The improved locking mechanism as claimed in claim 1, wherein said adjusting bolt (4) rotates along its own main shaft.
5. The improved locking mechanism as claimed in claim 1, wherein said upper end of the said adjusting bolt (4) is used for locking the slide plate.
6. The improved locking mechanism as claimed in claim 1, wherein said ladle slide gate mechanism capable of improving the locking safety of the slide plate is characterized in that it has bolt connecting block and the adjusting bolt (4) is equipped with sphere, the diameter of which is greater than the diameter of the bolt.
7.The improved locking mechanism as claimed in claim 1, wherein said bolt connecting block is provided with a recess for wrapping around the sphere to lock the sphere in the recess.

8.The improved locking mechanism as claimed in claim 1, wherein said bolt connecting block is connected to the upper part of the corner connecting block (6).
9.The improved locking mechanism as claimed in claim 1, wherein said ladle slide gate mechanism capable of improving the locking safety of the slide plate is characterized in that the corner fixing block (3) takes rectangular shape and the through-hole is located in the middle of the corner fixing block (3).
lO.The improved locking mechanism as claimed in claim 1, wherein said ladle slide gate mechanism capable of improving the locking safety of the slide plate is characterized in that the corner connecting block (6) is a strip in shape and fixed on the middle of the corner connecting block (6).