Slag blocking device and application

Abstract

The embodiment of the present application provides a slag blocking device and application, the slag blocking device comprises a slag blocking cover assembly and a slag blocking cover transfer assembly, the slag blocking cover assembly comprises a slag blocking cover main body and a support fixed on the slag blocking cover main body, one end of the slag blocking cover main body is provided with a circular opening, the other end is provided with a slag breaking part, the slag breaking part is inverted conical or inverted conical platform, the circular opening is provided with a sawtooth, one end of the support away from the slag blocking cover main body is provided with an elastic clamp; the slag blocking cover transfer assembly comprises a rotation center and a rotating arm capable of rotating around the rotation center to transfer the slag blocking cover to be used from a standby position to a working position, one end of the rotating arm away from the rotation center is provided with a clamping piece capable of being detachably connected with the elastic clamp. The slag blocking device in the application can avoid the steel slag from entering the RH vacuum chamber, is convenient to operate and is convenient for industrial application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel metallurgy, in particular to a slag blocking device and application. BACKGROUND

[0002] In the steel metallurgy industry, the RH vacuum furnace is an important secondary refining equipment, but in the process of use, especially in the ladle lifting stage, the steel slag is easy to enter the RH vacuum chamber through the immersion pipe, on the one hand, increasing the probability of oxidizing cold steel slag in the vacuum chamber, and intensifying the erosion of refractory materials, on the other hand, the reaction of steel slag and molten steel is easy to produce macro-inclusions, reducing the quality of molten steel. Therefore, how to reduce or avoid the entry of steel slag into the RH vacuum chamber is a problem to be solved.

[0003] The existing method for reducing or avoiding the entry of steel slag into the RH vacuum chamber mainly includes two categories, one is the bottom blowing slag breaking and slag skimming method, such as the patent "A method for reducing RH furnace and hot bending pipe cold steel slag" authorized by the author, but this method may cause the oxidation of molten steel and produce new inclusions; the other is the top slag breaking and slag skimming method, such as the patent CN202116591U-a slag blocking device, this kind of device has the following shortcomings: 1, with the increase of the number of treatment furnaces, the spacing (the initial spacing is about 5cm) between the ascending immersion pipe and the descending immersion pipe will be sintered and adhered together by the steel slag, resulting in no spacing, and the existing technology slag blocking cover needs to be wrapped around the immersion pipe before use, therefore, the immersion pipe is not suitable for use after several times of use; 2, with the continuous use of the spray material for spraying on the outer wall of the immersion pipe and the increasing of the adhered steel slag, the outer diameter of the immersion pipe will become larger and larger, which further illustrates the disadvantages of the immersion pipe outer diameter type slag blocking cover; 3, with the improvement of intelligence and the reduction of RH station personnel, generally only 3 people operate (computer operation, ladle lifting, temperature measurement and sampling) in the RH station, if the above device is used, 2 slag blocking covers are needed for each furnace of molten steel, and 2 people need to operate simultaneously, so that 4 people need to be set in the RH station, causing waste of personnel; 4, the above slag blocking cover needs to be manually held and operated by labor, and the manual holding method is difficult to center, which may affect the slag blocking effect; at the same time, the labor personnel is subjected to high temperature radiation / convection baking, the labor intensity is high, and the degree of automation is low.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The purpose of the present application includes, for example, providing a slag blocking device and application, which can avoid the entry of steel slag into the RH vacuum chamber while facilitating operation.

[0006] The embodiments of the present application can be implemented as follows:

[0007] In a first aspect, the present application provides a slag blocking device, comprising a slag blocking cover assembly and a slag blocking cover transfer assembly, the slag blocking cover assembly comprising a slag blocking cover body and a support fixed to the slag blocking cover body, the slag blocking cover body being provided with a circular opening at one end and a slag breaking portion at the other end, the slag breaking portion being in the shape of an inverted cone or an inverted conical platform, the circular opening being provided with sawteeth, the support being provided with an elastic clamp at an end away from the slag blocking cover body;

[0008] The slag blocking cover transfer assembly comprises a rotation center and a rotating arm capable of rotating around the rotation center to transfer the slag blocking cover to be used from a standby position to a working position, the rotating arm being provided with a clamping piece capable of detachable connection with the elastic clamp at an end away from the rotation center.

[0009] In an optional embodiment, the elastic clamp comprises a clamping ring having a certain length in the axial direction, the clamping ring being provided with a clamping hole penetrating through the clamping ring wall in the axial direction, the clamping hole being provided with guide plates on both sides of the clamping hole in the axial direction, the distance between the two guide plates gradually decreasing in the direction close to the clamping hole to the same width as the clamping hole, the width of the clamping piece being greater than the width of the clamping hole and the width of the clamping piece being less than or equal to the inner diameter of the clamping ring.

[0010] In an optional embodiment, the middle part of the guide plate close to the rotating arm is provided with a limiting gap to avoid axial displacement between the clamping piece and the clamping ring; and / or, the clamping piece is provided with a limiting portion at both ends, the middle part of the two limiting portions being provided with a clamping portion for clamping with the elastic clamp, the diameter of the limiting portion being greater than the inner diameter of the clamping ring.

[0011] In an optional embodiment, the support comprises a first connecting piece, a second connecting piece and a third connecting piece connected in sequence, wherein one end of the first connecting piece away from the second connecting piece is fixed to the slag blocking cover, one end of the third connecting piece away from the second connecting piece is fixed to the elastic clamp, and the first connecting piece and the third connecting piece are respectively located on both sides of the second connecting piece.

[0012] In an optional embodiment, the standby position is provided with a moving trolley, and the moving trolley is provided below with a magnetic suction cover for adsorbing the slag blocking cover to fix the slag blocking cover.

[0013] In an optional embodiment, the standby position is further provided with a track for driving the moving trolley.

[0014] In an optional embodiment, the rotating arm is provided with a striking portion close to the clamping piece.

[0015] In an optional embodiment, the slag stopper body further comprises a cylindrical portion coaxially arranged with the slag breaking portion, and the circular opening is arranged on the cylindrical portion.

[0016] In an optional embodiment, the slag stopper assembly comprises two slag stopper bodies fixed by a fixing member, and the support member is fixed on a side of one slag stopper body away from the other slag stopper body, and the distance between the two slag stopper bodies is matched with the distance between two immersion tubes of the RH vacuum furnace.

[0017] In an optional embodiment, the slag stopper assembly satisfies: the maximum inner diameter of the immersion tube within the service life of the immersion tube ≤ the maximum width of the slag stopper body ≤ the initial outer diameter of the immersion tube; the height of the cylindrical portion ≤ the height of the slag breaking portion ≤ the vertical distance between the ladle opening plane when the ladle car is opened to the processing position and the bottom end of the immersion tube; the height of the slag stopper body + the height of the second connecting member ≥ the net height of the ladle; and the projection of the slag stopper assembly on the plane where the molten steel liquid surface is located is located in the ladle when the ladle car is opened to the processing position.

[0018] Preferably, the maximum width of the slag stopper body is 600-1200 mm, the height of the slag stopper body is ≤600 mm, and the height of the support member is ≤600 mm.

[0019] In a second aspect, the application provides a method for avoiding the entry of steel slag into an RH vacuum chamber by using the slag stopping device according to any one of the preceding embodiments, comprising the following steps:

[0020] Placing the slag stopper to be used at a designated standby position, and driving the rotating arm to rotate along the rotation center so that the elastic clamp is rotated to the position of the clamping member and is clamped with the clamping member;

[0021] Continuing to drive the rotating arm to rotate the slag stopper to a working position, and the working position is located directly below the corresponding immersion tube of the RH vacuum furnace and the tip of the slag breaking portion faces downward when the slag stopper is located at the working position.

[0022] Opening the ladle car to the processing position and jacking up the ladle until the immersion tube is inserted to a designated depth in the ladle; and continuing to rotate the rotating arm after the top of the ladle collides with the rotating arm during the jacking up of the ladle, so that the elastic clamp is decoupled from the clamping member.

[0023] The beneficial effects of the embodiments of the application include, for example:

[0024] The slag stopping device in the application can avoid the entry of steel slag into the RH vacuum chamber while facilitating operation and industrial application.

[0025] The sawtooth structure on the slag baffle in the application can effectively reduce the amount of steel slag entering the immersion tube, especially in the later period of the operation cycle of the immersion tube, the bottom of the immersion tube is uneven, and the sawtooth structure can further reduce the amount of steel slag entering in the use process and improve the sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 The structure schematic diagram of the slag baffle in the application is shown in the figure.

[0028] Figure 2 The structure schematic diagram of the slag baffle is shown in the figure.

[0029] Figure 3 The structure schematic diagram of another slag baffle is shown in the figure.

[0030] Figure 4 The structure schematic diagram of the slag baffle containing two slag baffle bodies is shown in the figure.

[0031] Figure 5 The structure schematic diagram of another slag baffle containing two slag baffle bodies is shown in the figure.

[0032] Figure 6 The structure schematic diagram of the elastic clamp is shown in the figure.

[0033] Figure 7 The optional spatial layout of the slag baffle in the working position is shown in the figure.

[0034] Figure 8 The structure schematic diagram of the cooperation of the clamp and the clamping piece is shown in the figure.

[0035] Figure legend: 1-RH vacuum furnace; 2-refractory brick; 3-immersion tube; 4-liquid steel; 5-steel ladle; 6-slag baffle body; 7-supporting piece; 71-first connecting piece; 72-second connecting piece; 73-third connecting piece; 8-elastic clamp; 81-guide plate; 82-limiting notch; 9-clamping piece; 91-limiting part; 10-impact part; 11-rotating arm; 12-rotation center; 13-track; 14-movable trolley; 15-magnetic suction cover. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0038] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, if the terms "first", "second" and the like appear, they are only used for differentiation description, and cannot be understood as indicating or implying relative importance.

[0041] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0042] Please refer to Figure 1 The present embodiment provides a slag blocking device, which comprises a slag blocking cover assembly and a slag blocking cover transfer assembly, the slag blocking cover assembly comprises a slag blocking cover main body 6 and a support 7 fixed on the slag blocking cover main body 6, one end of the slag blocking cover main body 6 is provided with a circular opening, and the other end is provided with a slag breaking part, the slag breaking part is inverted conical or inverted conical platform, the circular opening is provided with a sawtooth, and one end of the support 7 away from the slag blocking cover main body 6 is provided with an elastic clamp 8.

[0043] The slag blocking cover transfer assembly comprises a rotating center 12 and a rotating arm 11 capable of rotating around the rotating center 12 to transfer the slag blocking cover to be used from a standby position to a working position, one end of the rotating arm 11 away from the rotating center 12 is provided with a clamping piece 9 capable of detachable connection with the elastic clamp 8.

[0044] The slag blocking device in the embodiment mainly includes two parts, one is a slag blocking cover for covering the opening below the immersion tube 3 to prevent the steel slag from passing through the immersion tube 3, and the other part is for moving the slag blocking cover from the standby position to the working position, i.e. the position covering the opening directly below the immersion tube 3. 1, the slag blocking cover assembly satisfies: the maximum inner diameter of the immersion tube during the service life of the immersion tube ≤ the width of the maximum part of the slag blocking cover body ≤ the initial outer diameter of the immersion tube; the height of the cylindrical part ≤ the height of the slag breaking part ≤ the vertical distance between the ladle opening plane when the ladle car is opened to the processing position and the bottom end of the immersion tube; the height of the slag blocking cover body + the height of the second connecting piece ≥ the net height of the ladle; when the ladle car is opened to the processing position, the projection of the slag blocking cover assembly on the plane where the molten steel liquid surface is located is located in the ladle; specifically:

[0045] Slag blocking cover: the slag blocking cover in the embodiment mainly includes a slag blocking cover body 6, a support 7 and an elastic clamp 8, wherein, considering that ordinary iron sheets and iron rods have many impurities and may affect the cleanliness of the molten steel 4, the slag blocking cover is preferably made of Q195, 45 steel or other steel materials with high cleanliness; in order to ensure a certain strength, the thickness of the slag blocking cover body 6 is preferably 0.5-3 mm, and the thickness or width of the support 7 is preferably 3-30 mm. The support 7 can be a rod, specifically one, two or more. In some embodiments, in order to ensure stability, the support 7 can include three support rods forming a triangle (as viewed from above).

[0046] For the specific shape of the slag blocking cover body 6: considering that the RH immersion tube 3 is circular and the need to save material consumption, the bottom end cross-sectional shape of the slag blocking cover body 6 is also circular and should not wrap the outer diameter of the immersion tube 3. When in use, the bottom end of the slag blocking cover body 6 directly contacts the bottom of the immersion tube 3 and is basically on the same plane; considering that the bottom of the immersion tube 3 (gunning) is not in the same level as when it is just put into use after being used for a period of time, it is uneven, in order to minimize the amount of steel slag entering during use and improve its sealing performance, the end of the slag blocking cover body 6 contacting the immersion tube 3 can be provided with sawteeth; the inverted conical slag breaking part will first contact the steel slag during use, which can push the steel slag to both sides, which is conducive to effective slag breaking and skimming. The specific shape is as shown in Figure 2 .

[0047] For the diameter D2 of the bottom end of the slag dam main body 6: considering that the refractory bricks 2 will erode from the initial thickness of about 200 mm to the residual thickness of about 40-100 mm as the immersion tube 3 is used, and the inner diameter D1 of the immersion tube 3 gradually expands from the initial state of 400-600 mm, in order to adapt to the slag dam throughout the service life of the immersion tube 3 (generally 80-150 times), the minimum diameter of the bottom end of the slag dam main body 6 is about [400+(200-100)*2] mm=600 mm; considering that the outer diameter D3 of the immersion tube 3 will become larger and larger as the outer wall of the immersion tube 3 is continuously sprayed with gunning material and more and more steel slag adheres to it, the diameter of the bottom end of the slag dam main body 6 (i.e. the width of the largest part of the slag dam main body 6) can be slightly larger than the initial outer diameter of the immersion tube 3, but from the perspective of saving material consumption and possibly not suitable for the early stage of the service life of the immersion tube 3, the maximum diameter of the bottom end of the slag dam main body 6 should be ≤ the initial outer diameter of the immersion tube 3 (generally about 1200 mm). Therefore, (the initial inner diameter of the immersion tube 3+the erosion amount of the radial refractory bricks 2 during the service life of the immersion tube 3*2)≤the diameter of the slag dam≤the initial outer diameter of the immersion tube 3, in some embodiments, the diameter of the bottom end of the slag dam main body 6 is 600-1200 mm, preferably 720-1200 mm.

[0048] In addition, from the perspective of saving material consumption, a series of slag dams with different diameters can be set and used in stages according to the change in the inner diameter of the immersion tube 3 during its service life, or a slag dam with adjustable diameter at any time can be designed, but from the perspective of convenience, a fixed-diameter slag dam is more practical.

[0049] For the height H4 of the slag dam main body 6: the clearance height H3 of the ladle 5 for molten steel 4 treated by the RH furnace (i.e. the vertical distance between the ladle 5 opening plane and the steel slag upper plane) is generally 200-900 mm; the vertical distance H2 between the ladle 5 opening plane and the bottom of the immersion tube 3 is generally 300-600 mm when the RH treatment position (i.e. directly below the immersion tube 3), in order to prevent the ladle 5 from colliding with the slag dam when the ladle 5 is moved (from the ladle position to the treatment position), and to consider the subsequent need to use the slag dam automatically with related equipment / facilities (i.e. the slag dam is placed near the bottom of the immersion tube 3 when the ladle 5 is not lifted to the RH treatment position, rather than a handheld slag dam which can bypass the ladle 5 and cover the immersion tube 3 during the lifting period of the ladle 5 at the RH treatment position), therefore the height H4 of the slag dam main body 6 should be ≤600 mm.

[0050] In some embodiments, the slag dam main body 6 further comprises a cylindrical portion coaxially arranged with the slag breaking portion, and the circular opening is arranged on the cylindrical portion, and the specific shape is as shown in Figure 3 .

[0051] From the perspective of saving material consumption, the middle part of the slag baffle can be made into a vertical cylindrical shape, and only the bottom part can be made into a conical shape to facilitate slag breaking. However, in order to improve the slag breaking effect of the slag breaking part, the height of the slag breaking part should not be too small, otherwise the steel slag is not easy to discharge outside the immersion tube 3. Therefore, the height H6 of the cylindrical part of the slag baffle is ≤ the height H4 of the main body 6 of the slag baffle ≤ the vertical distance H2 between the opening plane of the ladle 5 and the bottom of the immersion tube 3. Among them, the height H6 of the cylindrical part of the slag baffle is preferably ≤ 2 / 3*H4=400mm, and the height H4 of the main body 6 of the slag baffle is preferably ≤ 600mm.

[0052] In some embodiments, the slag baffle assembly includes two slag baffle main bodies 6 fixed by fixing members, the support member 7 is fixed on one side of one slag baffle away from the other slag baffle, the distance between the two slag baffles is matched with the distance between the two immersion tubes 3 of the RH vacuum furnace 1 to be used, and the specific shape is as shown in Figure 4 and 5 .

[0053] In view of the convenience of use, in order to block the slag of two immersion tubes 3 at the same time, two slag baffle main bodies 6 can be combined in series, that is, a double-baffle slag baffle.

[0054] For the height H5 of the support member 7: considering that the immersion tube 3 insertion depth H1 (i.e. the height of the upper interface of the steel slag above the bottom of the immersion tube 3) is generally 600mm during normal RH treatment, in order to ensure that all parts of the slag baffle can be subsequently melted by molten steel 4, the height H5 of the support member 7 is ≤ the immersion tube 3 insertion depth H1, and is preferably ≤ 600mm; considering that the ladle 5 has a high headroom when processing molten steel 4, during the lifting process of the ladle 5, when the ladle 5 / ladle 5 refractory just contacts the rotatable body (thickened part of the horizontal rod), the top of the slag baffle should have contacted the upper interface of the steel slag (otherwise, if the ladle 5 continues to lift, after the clamping member 9 is released, the slag baffle will tilt or fall, the center position will be offset, and the subsequent alignment with the immersion tube 3 will be affected, affecting the slag blocking effect), therefore, the height H4 of the main body 6 of the slag baffle + the height H5 of the support member 7 ≥ the headroom H3 of the ladle 5.

[0055] In an optional embodiment, the support member 7 includes a first connecting member 71, a second connecting member 72 and a third connecting member 73 connected in sequence, wherein one end of the first connecting member 71 away from the second connecting member 72 is fixed with the slag baffle, one end of the third connecting member 73 away from the second connecting member 72 is fixed with the elastic clamp 8, and the first connecting member 71 and the third connecting member 73 are respectively located on both sides of the second connecting member 72. In some embodiments, the first connecting member 71 and the third connecting member 73 are both parallel to the plane where the circular opening is located, and the second connecting member 72 is perpendicular to the plane where the circular opening is located.

[0056] For the length L1+L2+L3 of the support 7 (including the R-shaped elastic clamp 8):

[0057] As previously known, L1≥0 mm; preferably, to avoid the situation that all parts of the slag stopper cannot be completely melted by the molten steel 4, resulting in the need for time-consuming and laborious cleaning of the residual parts (such as the ends of the Z-shaped support rod and the R-shaped elastic clamp 8), the length of the Z-shaped support rod should not exceed the horizontal distance L4 between the inner wall of the ladle 5 and the outer side of the immersion tube 3, so as to ensure that all parts of the slag stopper are always (especially after the disconnection of the clamping piece 9) inside the ladle 5.

[0058] In summary: L2+L3≤L4, the horizontal distance between the inner wall of the ladle 5 and the outer side of the immersion tube 3; if the perfectness is not considered, such as cleaning difficulty, the above limitation can be ignored, that is, L2+L3≥L4, or even L2+L3≥L4+L5.

[0059] 2. The slag stopper transfer assembly mainly includes a rotating center 12, a rotating arm 11, and a clamping piece 9.

[0060] In an optional embodiment, as shown in Figure 8 the elastic clamp 8 includes a clamping ring (i.e., a cylindrical shape) having a certain length in the axial direction, a clamping hole is provided on the clamping ring and penetrates the ring wall of the clamping ring in the axial direction, guide plates 81 are provided on both sides of the clamping hole along the clamping hole, the distance between the two guide plates 81 gradually decreases in the direction close to the clamping hole to the same width as the clamping hole; the width of the clamping piece 9 is greater than the width of the clamping hole, and the width of the clamping piece is less than or equal to the inner diameter of the clamping ring; further, the middle part of the guide plate 81 on the side close to the rotating arm is provided with a limiting gap 82 to avoid axial displacement between the clamping piece 9 and the clamping ring; and / or, the clamping piece 9 has a limiting part 91 at both ends, and the middle part of the two limiting parts 91 is provided with a clamping part for clamping with the elastic clamp 8, and the diameter of the limiting part 91 is greater than the inner diameter of the clamping ring.

[0061] Specifically, in some embodiments, the elastic clamp 8 includes a positive R shape, a reverse R shape, or a combination thereof (inverted, symmetrical, etc.), as shown in Figure 6 In different categories, the movement mode of the rotatable body will be slightly different; considering the need for a certain elasticity (especially at the necked part), it is preferred to use common 65Mn, 55SiCr steel for manufacturing.

[0062] ①The overall length is mainly adapted to the site conditions, preferably 500-3000 mm; the diameter of the clamping piece 9 is slightly larger than the distance of the R-shaped elastic clamp 8 at the neck, so as to ensure that the slag cover will not easily fall off during the movement (such as rotation); in order to release the clamping piece 9 and the elastic clamp 8 during use, the ladle 5 / ladle 5 refractory will impact the rotating arm 11, in order to improve the durability, the side of the rotating arm 11 close to the clamping piece 9 is provided with an impact part 10, the width L6 of the impact part 10 is greater than or equal to the wall thickness of the ladle 5, which is greater than or equal to 200 mm; in some embodiments, the impact part 10 can also be provided on the support piece 7 (when L2+L3≥L4+L5).

[0063] ②In some embodiments, in order to ensure stability, the rotating arm 11 can include three rods forming a triangle (from the top view).

[0064] ③The center of the rotating body can be a cylinder or a sphere, preferably a sphere, so that the rotating arm 11 can rotate 360° in space, which is more conducive to the smooth clamping of the elastic clamp 8 and the clamping piece 9; some embodiments can be rotated clockwise or counterclockwise on the plane as shown in the foregoing Figure 1 , or the rotating arm 11 can be controlled by a motor to stop at a certain angle.

[0065] In an optional embodiment, a moving trolley is arranged on the standby position, and a magnetic suction cover 15 or a mechanical gripper is arranged below the moving trolley, the magnetic suction cover 15 is used to suck the slag cover to fix the slag cover, and the mechanical gripper mechanically clamps the slag cover to fix the slag cover; the standby position is also provided with a track 13 for driving the moving trolley, so that the slag cover can be transferred to a designated position to realize the butt joint of the clamping piece 9 and the elastic clamp 8.

[0066] 4, the spatial layout of the slag cover in the working position is shown in Figure 7 (Plan view):

[0067] ①Two sets of slag cover transfer assemblies can be arranged on the east and west sides of the immersion tube 3 respectively, and then two single-cover slag covers are used in cooperation (such as type one); if two sets of slag cover transfer assemblies are arranged on the south and north sides of the immersion tube 3 respectively, the support piece 7 of the slag cover should be "L-shaped" from the top view, and then two single-cover slag covers are used in cooperation (such as type two).

[0068] ②From the perspective of cost saving, one set of slag cover transfer device can be arranged on the east or west side of the immersion tube 3, and then one double-cover slag cover is used in cooperation (such as type three); if one set of slag cover transfer device is arranged on the south or north side, considering that the general temperature measurement and sampling platform is generally on the south side, it is preferred to arrange one set of slag cover transfer device on the north side (so as not to affect the temperature measurement and sampling operation), and then one double-cover slag cover is used in cooperation (such as type four).

[0069] ③Of course, other similar combinations should also be within the protection scope of the present application, especially for double-station RH furnace, only one set of transfer device of slag stopping cover can be arranged between two RH furnaces (used in cooperation with double-cover slag stopping cover), which is more simple and efficient.

[0070] Another embodiment of the present application provides a method for avoiding the entry of steel slag into the RH vacuum chamber by using the slag stopping device according to any one of the foregoing embodiments, comprising the following steps:

[0071] Placing the slag stopping cover to be used at the designated standby position, and driving the rotating arm 11 to rotate along the rotation center 12 so that the elastic clamping hoop 8 is rotated to the position where the clamping piece 9 is located and clamped with the clamping piece 9;

[0072] Continuing to drive the rotating arm 11 to rotate the slag stopping cover to the working position, which is located directly below the corresponding immersion tube 3 of the RH vacuum furnace 1 and the tip of the slag breaking part faces downward when the slag stopping cover is located at the working position;

[0073] Driving the tundish 5 to the treatment position and jacking up the tundish 5 until the immersion tube 3 is inserted into the tundish 5 to a designated depth; during the jacking up of the tundish 5, the top continues to rotate after hitting the rotating arm 11, so that the elastic clamping hoop 8 is unbuckled from the clamping piece 9;

[0074] Specifically, as shown in Figure 1 the method for avoiding the entry of steel slag into the RH vacuum chamber by using the slag stopping device, comprising the following steps:

[0075] S1: After the slag stopping cover transfer assembly moves to the B1 position, the movable trolley 14 moves the slag stopping cover from the position F to the position E, and then the slag stopping cover transfer assembly rotates counterclockwise to the B position, so that the clamping piece 9 is successfully clamped into the elastic clamping hoop 8.

[0076] S2: Before the tundish 5 is driven to the RH treatment position, the magnetic force of the magnetic attraction cover 15 disappears, the rotatable body rotates clockwise (from B to C to D) to the position D after stopping, and at this time the bottom of the slag stopping cover is basically coincided with the bottom of the immersion tube 3.

[0077] S3: The tundish 5 is driven from the ladle position to the treatment position, and when it is driven to the treatment position, the tundish 5 is jacked up, and when the tundish 5 / refractory of the tundish 5 collides with the rotatable body (the rotating arm 11 impact part 10), the clamping piece 9 is successfully unbuckled from the elastic clamping hoop 8.

[0078] S4: The tundish 5 continues to be jacked up, and at this time the slag stopping cover stops the steel slag to the outside of the immersion tube 3, until the immersion tube 3 reaches the set insertion depth (H1), and the RH vacuum treatment begins.

[0079] S5: The slag dam cover transfer assembly continues to rotate clockwise (from D to A to B1) to position B1, and the next cycle is performed when the next molten steel 4 arrives.

[0080] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A slag-blocking device, characterized in that, The system includes a slag-blocking hood assembly and a slag-blocking hood transfer assembly. The slag-blocking hood assembly includes a slag-blocking hood body and a support member fixed to the slag-blocking hood body. One end of the slag-blocking hood body is provided with a circular opening and the other end is provided with a slag-breaking part. The slag-breaking part is an inverted cone or an inverted frustum. The circular opening is provided with serrations. The end of the support member away from the slag-blocking hood body is provided with an elastic clamp. The slag-blocking cover transfer assembly includes a rotation center and a rotating arm that can rotate around the rotation center to transfer the slag-blocking cover to be used from the standby position to the working position. The end of the rotating arm away from the rotation center is provided with a snap-fit ​​member that can be detachably connected to the elastic clamp. The snap-fit ​​member is cylindrical or spherical.

2. The slag-blocking device according to claim 1, characterized in that, The elastic clamp includes a retaining ring with a certain length along the axial direction. The retaining ring is provided with a retaining opening that penetrates the retaining ring wall along the axial direction. Guide plates are provided on both sides of the retaining opening. The distance between the two guide plates gradually decreases along the direction close to the retaining opening until it is the same as the width of the retaining opening. The width of the retaining member is greater than the width of the retaining opening and the width of the retaining member is less than or equal to the inner diameter of the retaining ring.

3. The slag-blocking device according to claim 2, characterized in that, The guide plate near the rotating arm has a limiting notch in the middle to prevent axial displacement between the snap-fit ​​member and the retaining ring; and / or, both ends of the snap-fit ​​member have limiting portions, and the middle of the two limiting portions has a snap-fit ​​portion for snapping with the elastic clamp, the diameter of the limiting portion being larger than the inner diameter of the retaining ring.

4. The slag-blocking device according to claim 1, characterized in that, The support member includes a first connector, a second connector, and a third connector connected in sequence. The end of the first connector away from the second connector is fixed to the slag baffle, and the end of the third connector away from the second connector is fixed to the elastic clamp. The first connector and the third connector are located on both sides of the second connector.

5. The slag-blocking device according to claim 1, characterized in that, A mobile trolley is provided on the standby position, and a magnetic suction cover is provided below the mobile trolley. The magnetic suction cover is used to attract the slag-blocking cover to fix the slag-blocking cover.

6. The slag-blocking device according to claim 5, characterized in that, The standby position is also equipped with a track for the movement of a mobile trolley.

7. The slag-blocking device according to claim 1, characterized in that, The rotating arm has an impact part on the side near the snap-fit ​​component.

8. The slag-blocking device according to claim 1, characterized in that, The main body of the slag-blocking cover also includes a cylindrical part coaxially arranged with the slag-breaking part, and the circular opening is provided on the cylindrical part; And / or, the slag shield assembly includes two slag shield bodies fixed by fasteners, the support being fixed to the side of one slag shield away from the other slag shield, and the distance between the two slag shields being adapted to the distance between the two impregnation tubes of the applicable RH vacuum furnace.

9. The slag-blocking device according to claim 8, characterized in that, The slag-blocking hood assembly satisfies the following conditions: the maximum inner diameter of the immersion tube during its service life ≤ the width of the slag-blocking hood body at its maximum point ≤ the initial outer diameter of the immersion tube; the height of the cylindrical part ≤ the height of the slag-breaking part ≤ the vertical distance between the ladle opening plane and the bottom end of the immersion tube when the ladle car is driven to the processing position; the height of the slag-blocking hood body + the height of the second connecting piece ≥ the clear height of the ladle; when the ladle car is driven to the processing position, the projection of the slag-blocking hood assembly on the plane where the molten steel surface is located is inside the ladle; The maximum width of the slag-blocking cover body is 600~1200mm, the height of the slag-blocking cover body is ≤600mm, and the height of the supporting member is ≤600mm.

10. A method for preventing steel slag from entering an RH vacuum chamber using the slag-blocking device according to any one of claims 1-8, characterized in that, Includes the following steps: Place the slag-blocking cover to be used in the designated standby position, and drive the rotating arm to rotate around the rotation center so that the elastic clamp rotates to the position of the snap-fit ​​and snaps into the snap-fit. Continue to drive the rotating arm to rotate the slag baffle to the working position. The working position is located directly below the corresponding impregnation tube of the RH vacuum furnace, and when the slag baffle is in the working position, the tip of the slag breaking part faces downward. The ladle car is driven to the processing position and the ladle is lifted until the impregnation tube is inserted into the ladle to the specified depth; during the lifting process, the top of the ladle hits the rotating arm and continues to rotate, causing the elastic clamp to disengage from the snap-fit.

Images