The present relates to a slide gate mechanism, which is more specifically a high-efficiency automatic pressurizing slide gate mechanism technically belonging to metal casting field.
Background of the Invention:
Slide gate of ladle is an important system for controlling the liquid steel flow in the ladle. If steel leakage happens during operation of the system, a casting machine will stop casting and serious production accidents such as burning out of the casting machine will happen, which will affect the stability of the production and seriously threaten the safety of personnel and equipment. As the pace of steelmaking is further accelerated, higher requirements are put forward on speeding up the turnover of ladles and reducing production accidents, while the precondition is to ensure the safe operation of the slide gate. Generally, leakage is more likely to happen on the slide gate of small ladles, therefore, it is of great significance to reduce or eliminate the leakage accident of slide gate for steel making plants accelerating their production.
The slide gate mechanism is an essential part in the iron and steel industry. However, face pressing of the domestic slide gate mechanism is realized through manual locking of bolts at present. This features long operation time, high labour intensity, low efficiency, and large consumption of parts under high temperature environment. For changing of the sliding plate in an automatic pressing slide gate mechanism, the opening/closing frame can only be opened by opening both arms, thus the operation is complex and the efficiency is low.
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 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 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 favouring 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 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 automatic pressuring slide gate mechanism openable to single side bv a crank arm, said mechanism comprises a fixed frame, a sliding frame and an opening/closing frame, said mechanism characterized in that one side of the fixed frame is connected to the opening /closing frame bv pin through the pivot arm of straight face pressing rod, wherein the sliding frame is installed between the fixed frame and the opening/closing frame.
Objects of the invention
The main objective of the present invention is to provide an automatic pressuring slide gate mechanism openable to single side by a crank arm.
Another objective of the present invention is to control the flow of metal casting.
Another objective of the present invention is to prevent the steel leakage.
Another objective of the present invention is to provide a safe casting.
Another objective of the present invention is to save a production cost.
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 an improved automatic pressuring slide gate mechanism openable to single side by a crank arm. It consists of a fixed frame, a sliding frame, and an opening/closing frame, wherein one side of the fixed frame is connected with the opening/closing frame by pin through the pivot arm of

straight face pressing rod and the sliding frame is installed between the fixed frame and the opening/closing frame. Further, a primary guide rail and a secondary guide rail are respectively provided on the relative surfaces of the opening/closing frame and the sliding frame can slide reciprocally relative to the fixed frame through the primary guide rail and the secondary guide rail, and the sliding frame and the other side of the fixed frame are connected to the shaft hole on the opening/closing frame through the pivot arm of the crank face pressing rod.
Brief Description of Drawing
Fig. 1 shows a structural diagram of automatic pressuring slide gate mechanism openable to single side by a crank arm.
Fig. 2 shows a top view of Fig. 1.
Fig. 3 shows a right-side view of Fig. 1.
Fig. 4 shows a D-D section view of Fig. 1 of the present invention.
Fig. 5 shows a B-B section view of Fig. 1 of the present invention.
Fig. 6 shows a structural diagram of the spring bearer plate in the present invention.
Fig. 7 shows a side structural diagram of the spring bearer plate in the present invention.
Fig. 8 shows a structural diagram at slide gate of the present invention.
Fig. 9 shows a structural diagram of the pivot arm of the crank face pressing rod in the present invention.
These are the following referral numerals for mentioned drawings:
1-Opening/Closing Frame,
2-,
3-Face Pressing Bolt, 4- Vent Holes, 5-two pairs of connecting blocks,

6-pin,
7- crank face pressing rod,
8-sliding frame,
9- straight face pressing road,
10-Fixed Frame,
11-spring bearer plate,
12-compression springs,
13-spring guide sleeve,
14-guide hole,
15-an insert,
16- lower sliding plate,
17-upper sliding plate,
18- upper nozzle primary guide rail,
19-Primary Guide Rail
20-Secondary guide rail,
21- Face pressing rod
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 automatic pressuring slide gate mechanism openable to single side by a crank arm, said mechanism consists of a fixed frame, a sliding frame, and an opening/closing frame, wherein one side of the fixed frame is connected with the opening/closing frame by pin through the pivot arm of straight face pressing rod and the sliding frame is installed between the fixed frame and the opening/closing frame.
A primary guide rail and a secondary guide rail are respectively provided on the relative surfaces of the opening/closing frame and the sliding frame, and the sliding frame slides reciprocally relative to the fixed frame through the primary guide rail and the secondary guide rail, the sliding frame and the other side of the fixed frame are connected to the shaft hole on the opening/closing frame through the pivot arm of the crank face pressing rod.
When the pivot arm of the straight face pressing rod is opened, the pivot arm of the crank face pressing rod is rotated synchronously around the shaft hole for the opening/closing frame. Spring boxes are fixed on both sides of the opening/closing frame and compression springs are mounted in the spring boxes, a spring bearer plate is provided on the upper end cover of the compression springs, and a face pressing rod is provided on the upper end of the spring bearer plate.
The pivot arms of the face pressing rod are hinged at the two ends of the face pressing rod and the end of the pivot arm of the face pressing rod far away from the face pressing rod is hinged with the fixed frame. The face pressing bolt runs through the face pressing rod, wherein a face pressing bolt is installed on the face pressing rod; and presses against the spring bearer plate. The spring bearer plate is provided with a guide hole, an insert is installed in the guide hole, and the face pressing bolt extends into the guide hole and is connected against the insert.
An improved automatic pressuring slide gate mechanism openable to single side by a crank arm also includes two pairs of connecting blocks, wherein the two pairs of connecting blocks are provided symmetrically at the two sides of the fixed frame and the connecting blocks are respectively hinged to the fixed frame and the opening/closing frame.

For the face-pressed stable and conserving type slide gate mechanism, the pivot arm of the crank face pressing rod is of L shape, and the shaft holes for connecting with the opening/closing frame and fixed frame are provided respectively at both sides of it, wherein the spring bearer plate is also fixed with the spring guide sleeve which is perpendicular to the bottom of the spring box, and the compression spring sleeve is provided on the spring guide sleeve.
Furthermore, for the face-pressed stable and conserving type slide gate mechanism, vent holes are provided at both sides of the opening/closing frame and a lower sliding plate is installed at the liquid steel outlet inside the sliding frame; while an upper sliding plate is installed at the liquid steel outlet inside the fixed frame.
In present invention, the movement of the sliding frame is driven by the oil cylinder to realize the opening and closing of the mechanism as well as the pressurizing and pressure releasing and the pressurizing is realized when the primary guide rail in the opening/closing frame overlaps with the secondary guide rail in the sliding frame, while the pressure releasing is realized when the two guide rails are staggered.
The present invention discloses an improved automatic pressuring slide gate mechanism openable to single side by a crank arm. For its structure, it consists of a fixed frame (10), a sliding frame (8), an opening/closing frame (1), and two pairs of connecting blocks (5), wherein one side of the fixed frame is connected with the opening/closing frame by the pin (6) through the pivot arm of the straight face pressing rod (9) and, the sliding frame (8) is installed between the fixed frame (10) and the opening/closing frame (1).
The primary guide rail (19) and the secondary guide rail (20) are respectively provided on the relative surfaces of the opening/closing frame and the sliding frame and the sliding frame (8) slides reciprocally relative to the fixed frame through the primary guide rail (19) and the secondary guide rail (20), and the sliding frame (8) and the other side of the fixed frame (10) are connected to the shaft hole on the opening/closing frame through the pivot arm of the crank face pressing rod (7).
In present invention, the pivot arm of the crank face pressing rod (7) is of L shape, shaft holes for connecting with the opening/closing frame (1) and fixed frame (10)

are provided at both ends of it. When the pivot arm of the straight face pressing rod is opened for the opening/closing frame, the pivot arm of the crank face pressing rod (7) is rotated synchronously around the shaft hole and the two pairs of connecting blocks (5) are provided symmetrically at both sides of the fixed frame, and the connecting blocks are hinged with the fixed frame and the opening/closing frame respectively.
A lower sliding plate (16) is installed at the liquid steel outlet inside the sliding frame, while an upper sliding plate (17) is installed at the liquid steel outlet inside the fixed frame and the upper nozzle (18) is installed on the ladle. The safe and reliable casting and pressurizing is realized through effective cooperation of the lower sliding plate, the lower sliding plate and the upper nozzle.
Spring boxes are fixed on both sides of the opening/closing frame (1), and compression springs (12) are mounted in the spring boxes, wherein a spring bearer plate (11) is provided on the upper end cover of the compression spring and a face pressing rod (21) is provided on the upper end of the spring bearer plate. The pivot arms of the face pressing rod are hinged at both ends of the face pressing rod and the end of the pivot arm of the face pressing rod far away from the face pressing rod is hinged with the fixed frame (10), wherein a face pressing bolt (3) is installed on the face pressing rod (21) and the face pressing bolt (3) runs through the face pressing rod and presses against the spring bearer plate (11). The spring bearer plate is provided with a guide hole (14), an insert (15) is installed in the guide hole, and the face pressing bolt (3) extends into the guide hole and is connected against the insert.
Further, a spring guide sleeve (13) which is perpendicular to the bottom of the spring box is also connected on the spring bearer plate, and the compression spring sleeve is provided on the spring guide sleeve, wherein vent holes (4) are provided at both sides of the opening/closing frame (1), thus the gas between the opening/closing frame (1) and the fixed frame (10) is effectively vented out during pressing, so as to ensure the sealing during operation of the slide gate.
In present invention, the oil cylinder drives the guide rails of the sliding frame to overlap and adjusts the contact between the bolt and the spring bearer plate. The pressure is applied on the springs, the springs transfer the pressure to the opening/closing frame and the opening/closing frame applies the pressure on the

primary guide rail. Further, the primary guide rail transfers the pressure to the secondary guide rail, then the secondary guide rail applies the pressure on the sliding frame, and finally the pressure is acted between the two sliding plates to generate face pressing for sealing to prevent steel leakage. The pressure of the mechanism is released when changing the sliding plate on the sliding frame, then open the pivot arm of the straight face pressing rod at one side, and open the mechanism. In other words, changing of the sliding block is realized when the opening/closing frame, the crank face pressing arm and the sliding frame are opened through rotating around the connecting shaft, and after changing, the opening/closing frame, the crank face pressing arm and the fixed frame are connected together via the connecting shaft.
Further in present invention, the face pressing of the slide gate mechanism is stable, so that safety casting can be realized. Since face pressing rod is provided on the upper end of the spring bearer plate, the pivot arms of the face pressing rod are hinged at the both ends of the face pressing rod and the end of the pivot arm of the face pressing rod far away from the face pressing rod is hinged with the fixed frame. The face pressing bolt is installed on the face pressing rod and the face pressing bolt runs through the face pressing rod and presses against the spring bearer plate; then the pressure is applied to the compression spring through locking by the face pressing bolt and contacting with the spring bearer plate, and the compression springs apply the pressure on the opening/closing frame, thus face pressing is occurred between the two sliding plates to realize sealing to prevent steel leakage.
Since the spring bearer plate is provided with a guide hole, the accurate positioning of the face pressing bolt can be realized, so as to prevent deviation and ensure the stability of face pressing, an insert is installed in the guide hole, and the face pressing bolt extends into the guide hole and is connected against the insert. So, when the insert is worn, it can be removed and replaced by a new insert, thus there is no need to change the whole spring plate, so that the changing frequency of the whole spring bearer plate assembly is reduced, and the production cost is saved.
So, accordingly in the preferred embodiment, the present invention provides an improved automatic pressuring slide gate mechanism openable to single side by

a crank arm, said mechanism comprises a fixed frame (10), a sliding frame (8), and an opening/closing frame (1), said mechanism characterized in that one side of the fixed frame (10) is connected to the opening/closing frame (1) by pin (6) through the pivot arm of straight face pressing rod (9), wherein the sliding frame (8) is installed between the fixed frame (10) and the opening/closing frame (1).
In an embodiment, said primary guide rail (19) and a secondary guide rail (20) are respectively provided on the relative surfaces of the opening/closing frame (1) and the sliding frame (8).
In another embodiment, said sliding frame (8) and the other side of the fixed frame (10) are connected to the shaft hole on the opening/closing frame (1) through the pivot arm of the crank face pressing rod (7).
In yet another embodiment, said pivot arms of the face pressing rod (21) are hinged at both ends of the face pressing rod (21) and the end of the pivot arm of the face pressing rod (21) far away from the face pressing rod is hinged with the fixed frame (10).
In another embodiment, said pivot arm of the crank face pressing rod (7) is rotated synchronously around the shaft hole during the pivot arm of the straight face pressing rod (9) is opened for the opening/closing frame (1).
In yet another embodiment, said sliding frame (8) slides reciprocally relative to the fixed frame (10) through the primary guide rail (19) and the secondary guide rail (20).
In another embodiment, said sliding frame (8) slides reciprocally relative to the fixed frame (10) through the primary guide rail (19) and the secondary guide rail (20).
In yet another embodiment, said spring boxes are fixed on both sides of the opening/closing frame (1) and compression springs (12) are mounted in the spring boxes and a spring bearer plate (11) is provided on the upper end cover of the compression springs (12).
In another embodiment, said face pressing bolt (3) is installed on the face pressing rod (21), the face pressing bolt (3) runs through the face pressing rod (21) and

presses against the spring bearer plate (11), and the face pressing rod (21) is provided on the upper end of the spring bearer plate (11).
In yet another embodiment, said spring bearer plate (11) is provided with a guide hole (14), an insert (15) is installed in the guide hole (14), and the face pressing bolt (9) extends into the guide hole (14) and is connected against the insert (15).
In another embodiment, said mechanism comprises two pairs of connecting blocks (5) and the two pairs of connecting blocks (5) are provided symmetrically at the two sides of the fixed frame (10), and the connecting blocks (5) are respectively hinged to the fixed frame (10) and the opening/closing frame (1).
In yet another embodiment, said pivot arm of the crank face pressing rod (7) is of L shape, and the shaft holes for connecting with the opening/closing frame (1) and fixed frame (10) are provided respectively at both sides of it.
In another embodiment, said spring bearer plate (11) is also fixed with the spring guide sleeve (13) which is perpendicular to the bottom of the spring box, and the compression spring sleeve (12) is provided on the spring guide sleeve (13).
In yet another embodiment, wherein said vent holes (4) are provided at both sides of the opening/closing frame (1).
In another embodiment, said lower sliding plate (16) is installed at the liquid steel outlet inside the sliding frame (8), while an upper sliding plate (17) is installed at the liquid steel outlet inside the fixed frame (10).

Advantages
• The face pressing of the slide gate mechanism is stable, so that safety casting can be realized.
• The pressure is applied to the compression springs through locking by the face pressing bolt and contacting with the spring bearer plate, and then the compression springs apply the pressure on the opening/closing frame, thus face pressing is occurred between the two sliding plates to realize sealing to prevent steel leakage.
• An insert is installed in the guide hole, and the face pressing bolt extends into the guide hole and is connected against the insert, when the insert is worn, it can be removed and replaced by a new insert, thus there is no need to change the whole spring bearer plate, so that the changing frequency of the whole spring bearer plate assembly is reduced, and the production cost is saved.
• Due to straight-arm double-side opening mechanism, the time is saved and this greatly reduces the labor intensity.
• The guide rail suitable for the sliding frame is installed on the opening/closing frame at the side nearby the sliding frame and the working stability of the sliding frame is ensured.
• Since a spring guide sleeve which is perpendicular to the bottom of the spring box is also provided in the spring boxes, the deviation of the compression spring is prevented and the stability of face pressing is ensured.
• Due to vent holes are provided at two sides of the opening/closing frame, the gas between the opening/closing frame and the fixed frame can be effectively vented out during pressing, so as to ensure the sealing during operation of the slide gate.

We Claim:

1.An improved automatic pressuring slide gate mechanism openable to single side by a crank arm, said mechanism comprises a fixed frame (10), a sliding frame (8), and an opening/closing frame (1), said mechanism characterized in that one side of the fixed frame (10) is connected to the opening/closing frame (1) by pin (6) through the pivot arm of straight face pressing rod (9), wherein the sliding frame (8) is installed between the fixed frame (10) and the opening/closing frame (1).
2. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said primary guide rail (19) and a secondary guide rail (20) are respectively provided on the relative surfaces of the opening/closing frame (1) and the sliding frame (8).
3. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said sliding frame (8) and the other side of the fixed frame (10) are connected to the shaft hole on the opening/closing frame (1) through the pivot arm of the crank face pressing rod (7).
4. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said pivot arms of the face pressing rod (21) are hinged at both ends of the face pressing rod (21) and the end of the pivot arm of the face pressing rod (21) far away from the face pressing rod is hinged with the fixed frame (10).
5. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said pivot arm of the crank face pressing rod (7) is rotated synchronously around the shaft hole during the pivot arm of the straight face pressing rod (9) is opened for the opening/closing frame (1).
6. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said sliding frame (8) slides reciprocally relative to the fixed frame (10) through the primary guide rail (19) and the secondary guide rail (20).
7. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said spring boxes are fixed on both sides of the opening/closing frame (1) and compression springs (12) are mounted in the spring

boxes and a spring bearer plate (11) is provided on the upper end cover of the compression springs (12).
8. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said face pressing bolt (3) is installed on the face pressing rod (21), the face pressing bolt (3) runs through the face pressing rod (21) and presses against the spring bearer plate (11), and the face pressing rod (21) is provided on the upper end of the spring bearer plate (11).
9. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said spring bearer plate (11) is provided with a guide hole (14), an insert (15) is installed in the guide hole (14), and the face pressing bolt (9) extends into the guide hole (14) and is connected against the insert (15).

10. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said mechanism comprises two pairs of connecting blocks (5) and the two pairs of connecting blocks (5) are provided symmetrically at the two sides of the fixed frame (10), and the connecting blocks (5) are respectively hinged to the fixed frame (10) and the opening/closing frame (1).
11. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said pivot arm of the crank face pressing rod (7) is of L shape, and the shaft holes for connecting with the opening/closing frame (1) and fixed frame (10) are provided respectively at both sides of it.
12. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said spring bearer plate (11) is also fixed with the spring guide sleeve (13) which is perpendicular to the bottom of the spring box, and the compression spring sleeve (12) is provided on the spring guide sleeve (13).
13. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said vent holes (4) are provided at both sides of the opening/closing frame (1).
14. The improved automatic pressuring slide gate mechanism openable to single side by a crank arm, wherein said lower sliding plate (16) is installed at the liquid steel outlet inside the sliding frame (8), while an upper sliding plate (17) is installed at the liquid steel outlet inside the fixed frame (10).