The present invention relates to the field of steel metallurgy.
More Particularly, the present invention relates to a slide gate mechanism.
More particularly, the present invention relates to a durable and conserving type slide gate mechanism.
Even more particularly, the present invention relates to an improved slide gate mechanism, which is simply and easily operated, requires low labor intensity and features stable face compression.
Background of the Invention
With the development of rapid and efficient continuous casting and secondary refining technologies and processes, the slide gate has played a more and more important role in the modern iron and steel smelting process, and has become an indispensable part in smelting process. It is the control device for liquid steel in the casting process of CCM and can precisely adjust the liquid steel flowrate from the ladle to the continuous casting tundish, realizing the balance between liquid steel flow-in and flow-out, so that the continuous casting operation can be more easily controlled. The slide gate system has been rapidly developed due to its good controllability and ability to improve steelmaking production efficiency. Now, the slide gate system is widely used in ladle and tundish at home and abroad.
The slide gate is generally composed of driving device, mechanical part and refractory part i.e. upper and lower slides and lower nozzle. The working principle of the slide gate is to slide the upper and lower slides through the mechanism, thus driving the opening and closing of the liquid steel outlet to adjust the flow rate of liquid steel. At present, the slide gates adopt springs for pressing. In high temperature and high intensity environment, the spring pressing plate is easy to fail, which causes the high consumption and resource waste, and it is prone to surface pressure instability, which has potential safety hazards. Therefore, developing a slide gate mechanism without the above drawbacks has become a technical problem to be solved by technical personnel in this specific field.
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 slide gate mechanism for longer durability and conserving, said mechanism comprising of an upper slide, a lower slide, an opening/closing frame, a sliding frame and a fixed frame, wherein the opening/closing frame is fixed with a spring case, which is vertically provided with compression springs in parallel and a spring pressing plate at the opening end, said mechanism characterized in that the spring case is provided with a breather hole, which enables the connection between cooling air passage and spring case to introduce the cooling air into the spring case for cooling compression spring and the end of the spring guiding sleeve is higher than the breather hole to ensure the smooth flow of cooling air into the spring case for cooling the compression springs, stability and cooling temperature.
Objects of the invention
The main objective of the present invention is to provide slide gate mechanism for longer durability and conserving.
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 discloses a durable and conserving type slide gate mechanism, which comprises an upper slide, a lower slide and frame. The frame comprises an opening/closing frame, a sliding frame and a fixed frame, and the sliding frame is hidden in the opening/closing frame, and the fixed frame is arranged at the bottom end of the opening/closing frame, and the sliding frame is

located between the opening/closing frame and the fixed frame. The chamber of sliding frame is provided with a lower slide, which is connected with the lower nozzle at the bottom. The chamber of fixed frame is provided with an upper slide inside. The upper slide is provided with an upper nozzle, which is sleeved by the liquid steel ladle to drive the sliding frame, so the fixed frame can slide relative to sliding frame, realizing the ladle casting and closing. The structure of slide gate in this invention features simple operation, low labor intensity and stable surface pressing, which enable the safe casting. With the adoption of cooling system, the service life of compression spring is prolonged, thus ensuring high efficiency and reducing costs.
Statement of the invention
Accordingly, the present invention provides an improved slide gate mechanism for longer durability and conserving, said mechanism comprising of an upper slide, a lower slide, an opening/closing frame, a sliding frame and a fixed frame, wherein the opening/closing frame is fixed with a spring case, which is vertically provided with compression springs in parallel and a spring pressing plate at the opening end, said mechanism characterized in that the spring case is provided with a breather hole, which enables the connection between cooling air passage and spring case to introduce the cooling air into the spring case for cooling compression spring and the end of the spring guiding sleeve is higher than the breather hole to ensure the smooth flow of cooling air into the spring case for cooling the compression springs, stability and cooling temperature.
Brief Description of Drawing
Fig. 1 shows a structural sketch of the durable and conserving type slide gate mechanism.
Fig. 2 shows the D-D section view of Fig.l.
Fig. 3 shows a front view of Fig.l.
Fig. 4 shows a structural sketch of upper and lower slides in the frame of the durable and conserving type slide gate mechanism.
Where referral numerals are following: 1-upper slide; 2-lower slide; 3-opening/closing frame; 31-spring case; 32-compression spring; 33-spring

pressing plate; 34-spring guiding sleeve; 35-face pressing rod; 36-face pressing bolt; 37-pivot arm; 38-fixing block; 39-cooling air passage; 4-sliding frame; 5-fixed frame; 51-connecting block; 6-lower slide; 7-upper slide; 8-upper nozzle; 9-cooling air pipe; 10-breather 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 develops a durable and conserving type slide gate structure, which can be simply and easily operated, requires low labor intensity, and features stable face compression, thus realizing safe casting and cooling. The system increases the service life of the compression spring, ensuring high efficiency and reducing costs. With the adoption of cooling system, the service life of compression spring is prolonged, thus ensuring high efficiency and reducing costs.
The present invention provides a durable and conserving type slide gate mechanism, which consists of an upper slide, a lower slide and a frame holding them, further the frame consists of an opening/closing frame, a sliding frame and a fixed frame, of which the opening/closing frame is fixed with a spring case, which is vertically provided with compression springs in parallel and spring pressing plate at the opening end. The spring pressing plate contacts with the compression springs via spring guiding sleeve and the spring case is fixed with face pressing rod, which is provided with a face pressing bolt.

The face pressing rod is suspended above spring case via a pivot arm, which is installed at two sides of spring case and the two sides of opening/closing frame are installed with four fixing blocks symmetrically, which are provided with fixing holes.
The sliding frame is hidden in the opening/closing frame, which is installed with rails at the bottom. And the sliding frame is connected into opening/closing frame by means of rails.
The fixed frame is installed at the bottom of opening/closing frame and provided with connecting blocks at their four corners and the connecting blocks will match with the fixing block on the opening/closing frame and connect with the fixing block via connecting pin. The sliding frame is located between opening/closing frame and fixed frame.
The chamber of sliding frame is provided with lower slide, which is connected with the lower nozzle at the bottom. The chamber of fixed frame is provided with upper slide inside. The upper slide is provided with an upper nozzle, which is sleeved by the liquid steel ladle to drive the sliding frame, so the fixed frame can slide relative to sliding frame, realizing the ladle casting and closing.
Furthermore, the opening/closing frame is provided with a cooling air passage connected with a spring case, and the cooling air passage is connected with cooling air via cooling air pipes, which stretches out of opening/closing frame from one end.
The present invention is designed with a cooling air passage, which is connected with the spring case for cooling the compression springs, thus improving the service life of compression spring and working efficiency.
The spring case is further provided with a breather hole, and the end of the spring guiding sleeve in the spring case is higher than the breather hole along the vertical direction of the spring case.
The spring case is further provided with a breather hole, which enables the connection between cooling air passage and spring case, so the cooling air can be introduced into the spring case for cooling compression spring. The end of the spring guiding sleeve is higher than the breather hole to ensure the smooth flow of cooling air into the spring case for cooling the compression springs, which has

the advantages of stable and even cooling temperature and less cost due to shorter guiding sleeve. If the end of spring guiding sleeve is lower than the breather hole, it will cover the breather hole and limit the cooling air from entering spring case, thus weakening the cooling effect to compression spring.
The durable and conserving type slide gate mechanism is characterized in that the pivot arm is rotatably coupled to the fixed frame through a connecting pin.
Further, the pivot arm is rotatably coupled to the fixed frame to facilitate the replacement of the upper and lower slides. First, the face pressing bolt is screwed out, the slide gate mechanism is released, and the pivot arm of the face pressing rod is opened, that is, the opening/closing frame and the sliding frame rotate to open around connecting pin, and the connecting pin connects the fixed frame and the pivot arm of the face pressing rod. After being opened, the lower slide in the chamber of the sliding frame and the upper slide in the chamber of the fixed frame can be replaced, so as to enable the maintenance and cleaning works, featuring convenient and fast, time saving and labor intensity reduction.
The present invention provides a durable and conserving type slide gate mechanism consists of an upper slide (1), a lower slide (2) and a frame holding them, wherein the frame consists of an opening/closing frame (3), a sliding frame (4) and a fixed frame (5).
The opening/closing frame (3) is fixed with a spring case (31), which is vertically provided with compression springs (32) in parallel and a spring pressing plate (33) at the opening end, wherein the spring pressing plate (33) contacts with the compression springs (32) via a spring guiding sleeve (34).
The spring case (31) is further provided with a breather hole (10), and the end of the spring guiding sleeve (34) in the spring case (31) is higher than the breather hole (10) along the vertical direction of the spring case (31). The spring case (31) is further fixed with a face pressing rod (35), which is provided with a face pressing bolt (36) and the face pressing rod (35) is suspended above spring case (31) via a pivot arm (37), which is installed at two sides of spring case (31).
The pivot arm (37) is rotatably coupled to the fixed frame (5) through a connecting pin and the two sides of opening/closing frame (3) are installed with four fixing blocks (38) symmetrically, which are provided with fixing holes.

The opening/closing frame (3) is provided with a cooling air passage (39) connected with spring case (31), and the cooling air passage (39) is connected with cooling air via cooling air pipes (9), which stretches out of opening/closing frame (3) from one end.
The sliding frame (4) is hidden in the opening/closing frame (3), which is installed with rails at the bottom. And the sliding frame (4) is connected into opening/closing frame (3) by means of rails.
The fixed frame (5) is installed at the bottom of opening/closing frame (3) and provided with connecting blocks (51) at their four corners and the connecting blocks (51) matches with the fixing block (38) on the opening/closing frame (3) and connect with the fixing block (38) via connecting pin. The sliding frame (4) is located between opening/closing frame (3) and fixed frame (5).
The chamber of sliding frame (4) is provided with a lower slide (6), which is connected with the lower nozzle at the bottom. The chamber of fixed frame (5) is provided with an upper slide (7) inside. The upper slide (7) is provided with a upper nozzle (8), which is sleeved by the liquid steel ladle to drive the sliding frame (4), so the fixed frame (5) can slide relative to sliding frame (4), realizing the ladle casting and closing.
A hydraulic cylinder is provided at one end of the sliding frame (4) to drive it for reciprocating motion. The sliding frame (4) slides by contacting on the opening/closing frame (3) via the guiding rails, and it slides relative to the fixed frame (5).The face pressing bolt (36) locks the face pressing rod (35) and is in contact with the spring pressing plate (33), so the pressure is applied to the compression spring (32), which will press the opening/closing frame (3), thus pressing guiding rails. From which, the pressure will be transmit to sliding frame (4), thus generating compression between the upper and lower slides (7) and lower slide (2), which act as sealing function to prevent breakout. Meanwhile, the reciprocating motion of sliding frame (4) will drive the upper and lower slides (7) and 2 to be aligned and staggered, thus realizing the ladle opening and closing. During working, the cooling air is also introduced through the cooling air pipe (9) into the cooling air passage (39) for cooling the compression spring (32).
So, accordingly in the preferred embodiment, the present invention discloses an improved slide gate mechanism for longer durability and conserving, said

mechanism comprising of an upper slide (1), a lower slide (2), an opening/closing frame (3), a sliding frame (4) and a fixed frame (5), wherein the opening/closing frame (3) is fixed with a spring case (31), which is vertically provided with compression springs (32) in parallel and a spring pressing plate (33) at the opening end, said mechanism characterized in that the spring case is provided with a breather hole, which enables the connection between cooling air passage and spring case to introduce the cooling air into the spring case for cooling compression spring and the end of the spring guiding sleeve is higher than the breather hole to ensure the smooth flow of cooling air into the spring case for cooling the compression springs, stability and cooling temperature.
In an embodiment, said sliding frame is located between opening/closing frame and fixed frame, and sliding frame is hidden in the opening/closing frame, which is installed with rails at the bottom and the sliding frame is connected into opening/closing frame by means of rails.
In another embodiment, said fixed frame is installed at the bottom of opening/closing frame and provided with connecting blocks at their four corners to match with the fixing block on the opening/closing frame and connect with the fixing block via connecting pin.
In yet another embodiment, said spring pressing plate contacts with the compression springs via a spring guiding sleeve and the spring case is fixed with a face pressing rod, which is provided with face pressing bolt and the face pressing rod is suspended above spring case via a pivot arm, which is installed at two sides of spring case and the two sides of opening/closing frame are installed with four fixing blocks symmetrically, which are provided with fixing holes.
In yet another embodiment, said upper slide is provided with an upper nozzle, which is sleeved by the liquid steel ladle to drive the sliding frame, so the fixed frame slides relative to sliding frame, realizing the ladle casting and closing.
In another embodiment, said chamber of sliding frame is provided with a lower slide, which is connected with the lower nozzle at the bottom and the chamber of fixed frame is provided with an upper slide inside.
In yet another embodiment, said opening/closing frame is provided with a cooling air passage connected with spring case, and the cooling air passage is connected

with cooling air via a cooling air pipe, which stretches out of opening/closing frame from one end.
In another embodiment, said spring case is provided with a breather hole, and the end of the spring guiding sleeve in the spring case is higher than the breather holes along the vertical direction of the spring case.
In yet another embodiment, said the pivot arm is rotatably coupled to the fixed frame to facilitate the replacement of the upper and lower slides.
Advantages
• The spring pressing plate contacts with compression spring by spring guiding sleeve, which is favourable for the even compression on spring pressing plate and prevents compression spring from instability in the spring case.
• The face pressing bolt is convenient for control, thus ensuring the face pressing stable and realizing safe casting.
• The sealing between the upper and lower slides is strengthened, thus preventing the breakout which is unfavourable for the working environment and improving the casting efficiency.
• The opening/closing frame is provided with fixing blocks, which are matched with the connecting blocks on the fixed frame and connected with the connecting pin, facilitating easy assembly/disassembly and future maintenance.

We claim:

1.An Improved slide gate mechanism for longer durability and conserving, said mechanism comprising of an upper slide (1), a lower slide (2), an opening/closing frame (3), a sliding frame (4) and a fixed frame (5), wherein the opening/closing frame (3) is fixed with a spring case (31), which is vertically provided with compression springs (32) in parallel and a spring pressing plate (33) at the opening end, said mechanism characterized in that the spring case is provided with a breather hole, which enables the connection between cooling air passage and spring case to introduce the cooling air into the spring case for cooling compression spring and the end of the spring guiding sleeve is higher than the breather hole to ensure the smooth flow of cooling air into the spring case for cooling the compression springs, stability and cooling temperature.
2. The improved slide gate mechanism for longer durability and conserving as claimed in claim 1, wherein said sliding frame (4) is located between opening/closing frame (3) and fixed frame (5), and sliding frame (4) is hidden in the opening/closing frame (3), which is installed with rails at the bottom and the sliding frame (4) is connected into opening/closing frame 3 by means of rails.
3. The improved slide gate mechanism for longer durability and conserving as claimed in claim 1, wherein said fixed frame (5) is installed at the bottom of opening/closing frame (3) and provided with connecting blocks (51) at their four corners to match with the fixing block (38) on the opening/closing frame (3) and connect with the fixing block (38) via connecting pin.
4. The improved slide gate mechanism for longer durability and conserving as claimed in claim 1, wherein said spring pressing plate (33) contacts with the compression springs (32) via a spring guiding sleeve (34) and the spring case (31) is fixed with a face pressing rod (35), which is provided with face pressing bolt (36) and the face pressing rod (35) is suspended above spring case (31) via a pivot arm (37), which is installed at two sides of spring case 31and the two sides of opening/closing frame (3) are installed with four fixing blocks (38) symmetrically, which are provided with fixing holes.
5. The improved slide gate mechanism for longer durability and conserving as claimed in claim 1, wherein said upper slide (7) is provided with an upper

nozzle (8), which is sleeved by the liquid steel ladle to drive the sliding frame (4), so the fixed frame (5) slide relative to sliding frame (4), realizing the ladle casting and closing.
6. The improved slide gate mechanism for longer durability and conserving as claimed in claim 1, wherein said chamber of sliding frame (4) is provided with a lower slide (6), which is connected with the lower nozzle at the bottom and the chamber of fixed frame (5) is provided with an upper slide (7) inside.
7. The improved slide gate mechanism for longer durability and conserving as claimed in claim 1, wherein said opening/closing frame (3) is provided with a cooling air passage (39) connected with spring case (31), and the cooling air passage (39) is connected with cooling air via a cooling air pipe (9), which stretches out of opening/closing frame (3) from one end.
8. The improved slide gate mechanism for longer durability and conserving as claimed in claim 1, wherein said spring case (31) is provided with a breather hole, and the end of the spring guiding sleeve (34) in the spring case (31) is higher than the breather holes (10) along the vertical direction of the spring case (31).
9. The improved slide gate mechanism for longer durability and conserving as claimed in claim 1, wherein said the pivot arm (37) is rotatably coupled to the fixed frame (5) to facilitate the replacement of the upper and lower slides.