Slag stopping plug for converter tapping

Abstract

The utility model discloses a slag stopping plug for converter tapping, which comprises a slag stopping plug body and a drainage rod, a central through hole of the slag stopping plug body comprises a first hole and a second hole, and the second hole is in a big-end-down circular truncated cone shape; the lower part of the drainage rod is coated with a drainage rod fire-resistant layer, and the upper end surface of the drainage rod fire-resistant layer is a conical surface; the drainage rod penetrates through the center through hole of the slag stopping plug body, the end face of the upper end of the drainage rod fire-resistant layer is matched with the hole wall of the second hole, a clamp is inserted into the top of the first hole, and the upper surface of the slag stopping plug body is covered with a connecting portion fire-resistant layer. The slag stopping plug for converter tapping is easy and convenient to assemble and operate, the assembled structure is high in firmness, meanwhile, the corrosion resistance of the connecting portion of the slag stopping plug body and the slag stopping plug body is good, erosion of molten steel to the slag stopping plug can be effectively weakened, the slag stopping plug is more stable in use, the slag stopping success rate is increased, and the molten steel quality is stabilized.

Description

Technical Field

[0001] The utility model relates to the technical field of converter steel tapping equipment, in particular to a slag blocking plug for converter steel tapping. Background Art

[0002] Reducing the amount of slag during the converter tapping process is an important aspect of improving the quality of molten steel, and effective slag blocking operation can reduce the amount of slag, thereby reducing the rephosphorization of molten steel, stabilizing the quality of molten steel, and reducing the erosion of slag on the ladle refractory. The most widely used slag blocking method at present is the slag plug method. The slag plug is made of a slag plug body and a drainage rod, wherein the drainage rod plays a guiding role so that the slag plug body can fall into the tapping port; the density of the slag plug body is set so that it can float on the slag interface. Specifically, when in use, the slag plug is accurately delivered to the tapping port position by a slag blocking car, and the slag plug body floats on the slag interface. As the molten steel is reduced and discharged, the slag plug body gradually sinks and eventually blocks the tapping port, thereby completing the slag blocking operation.

[0003] The structure of the existing slag plug is specifically as follows: the slag plug body is in the shape of a truncated cone with a larger top and a smaller bottom. The slag plug body has a center hole, and the drain rod passes through the center hole of the slag plug body. The gap between the slag plug body and the drain rod is filled with refractory clay. After drying, the refractory clay not only prevents corrosion but also fixes the slag plug body and the drain rod. For this type of slag plug, the operation process of filling the gap between the slag plug body and the drain rod with refractory clay is relatively cumbersome, and the filling quality varies, which often leads to uneven quality of the manufactured slag plugs and makes it difficult to guarantee the quality. In addition, the temperature of the molten steel during the converter tapping is relatively high, at around 1650°C. When the slag plug is blocking slag for a long time, the molten steel and liquid slag can easily erode the refractory clay between the drain rod and the slag plug body, causing the two to separate and resulting in slag blocking failure. Utility Model Content

[0004] The utility model aims to provide a slag blocking plug for converter tapping.

[0005] The technical solution for achieving the purpose of the utility model is: a slag plug for tapping steel from a converter, comprising a slag plug body and a drain rod, the slag plug body being in the shape of a truncated cone with a larger upper portion and a smaller lower portion, a central through hole being vertically opened on the slag plug body, the central through hole comprising a first hole and a second hole distributed in sequence from top to bottom, the first hole being in the shape of a column, the second hole being in the shape of a truncated cone with a smaller upper portion and a larger lower portion, the first hole and the second hole being coaxial and connected; the lower portion of the drain rod is covered with a drain rod refractory layer, the upper end face of the drain rod refractory layer being a conical surface, and the inclination of the upper end face of the drain rod refractory layer being consistent with the slope of the wall of the second hole; the drain rod passes through the central through hole of the slag stop plug body, and the upper end of the refractory layer of the drain rod extends into the second hole, and the upper end face of the refractory layer of the drain rod is adapted to the wall of the second hole, and a clip is inserted into the top of the first hole, and the clip is located between the slag stop plug body and the drain rod, and the slag stop plug body, the clip and the drain rod are clamped to each other, and the upper surface of the slag stop plug body is covered with a connecting part refractory layer, and the clip and the top of the first hole are both covered in the connecting part refractory layer.

[0006] Furthermore, the clip is thicker at the top and thinner at the bottom, and has an arcuate cross-section. Once the clip, which is thicker at the top and thinner at the bottom, is placed in the first hole and between the slag stop plug body and the drain rod, it is easily clamped as it is squeezed downward. The clip, with its arcuate cross-section, better fits the gap between the slag stop plug body and the drain rod, making it easier to insert into the gap.

[0007] Furthermore, there are two clips, which are respectively located on opposite sides of the drain rod. When the slag stop plug body and the drain rod are clamped, the coaxiality between the slag stop plug body and the drain rod is improved, and the upper end surface of the refractory layer of the drain rod below the slag stop plug body is better adapted to the wall of the second hole.

[0008] Furthermore, the refractory layer of the connecting portion is conical in shape. The conical refractory layer of the connecting portion not only has a lower surface with a large contact surface with the upper surface of the slag stop plug body, but also has a high upward height and a large contact surface with the drain rod. The refractory layer of the connecting portion having a large contact surface with both the slag stop plug body and the drain rod can greatly protect the space between the slag stop plug body and the drain rod, as well as the clip, from corrosion.

[0009] Furthermore, a molten steel guide groove is provided on the peripheral wall of the slag blocking plug body, and the upper end of the molten steel guide groove is closed and the lower end is open. The molten steel guide groove is provided to guide the molten steel, accelerate the outflow of the molten steel, and make the outflow of the molten steel smoother. Under the structure in which the upper end of the molten steel guide groove is closed and the lower end is open, the slag from above cannot enter the molten steel guide groove with the upper end closed and mix into the molten steel, while the molten steel from below can enter the molten steel guide groove and flow out along the molten steel guide groove. In other words, the molten steel guide groove with the upper end closed and the lower end open can not only guide the molten steel, but also prevent the slag from above from entering the molten steel guide groove, thereby greatly improving the effect of slag separation.

[0010] Furthermore, the number of the molten steel guide grooves is three, and the three molten steel guide grooves are evenly distributed along the circumference of the slag stopper body.

[0011] The utility model relates to a slag plug for tapping steel from a converter. After the drain rod passes through the central through hole of the slag plug body, the clip is directly inserted into the top of the first hole. The slag plug body and the drain rod are clamped and fixed by the clip, and then the refractory layer of the connecting part is coated on the upper surface of the slag plug body. The refractory layer of the connecting part is used to protect the clip and the structure in the first hole from corrosion. The slag plug for steel tapping from the converter, on the one hand, the slag plug body and the drain rod are directly clamped and fixed by the clip. Compared with filling the small gap between the slag plug body and the drain rod with refractory material and the fixing structure bonded by the refractory material, the fixing structure inserted into the clip and clamped is not only simple to assemble, but the rigid fastening of the clip is more reliable and stronger than the bonding of the refractory material, and the slag plug body and the drain rod are not easy to fall off and separate; on the other hand, the refractory layer of the connection part is coated on the upper surface of the slag plug body to prevent corrosion of the clip and the structure in the first hole, while the operation is convenient. Since the refractory layer of the connection part is located on the upper surface of the slag plug body and has less contact with the molten steel, the refractory layer of the connection part has stronger corrosion resistance, better protection for the clip and the structure in the first hole, reduced corrosion of the slag plug by the molten steel, and extended the service life of the slag plug.

[0012] The utility model relates to a slag plug for tapping steel from a converter. The central through hole includes a truncated cone-shaped second hole. The upper end face of the refractory layer of the drain rod is a conical surface. After the drain rod passes through the central through hole of the slag plug body, the upper end of the refractory layer of the drain rod can be extended into the second hole. The upper end face of the refractory layer of the drain rod is matched with the hole wall of the second hole. Under this structure, when force is applied to make the upper end face of the refractory layer of the drain rod match the hole wall of the second hole, a part of the force between the upper end face of the refractory layer of the drain rod and the hole wall of the second hole can be decomposed into a horizontal force. The horizontal force squeezes the hole wall of the second hole, forming a pre-tightening force between the refractory layer of the drain rod and the second hole. The horizontal pre-tightening force can make the sealing between the refractory layer of the drain rod and the slag plug body better, and can effectively prevent molten steel from entering the central through hole from the second hole, thereby avoiding corrosion in the central through hole.

[0013] The utility model discloses a slag plug for tapping steel from a converter, and the fastening structure of the clip to the slag plug body and the drain rod, combined with the structural setting of the refractory layer of the connection part and the upper end face of the refractory layer of the drain rod being adapted to the hole wall of the second hole, makes the assembly operation of the slag plug not only simple and convenient, but also has strong structural firmness after assembly. At the same time, under the structure of the refractory layer of the connection part at the upper and lower ends of the slag plug body and the upper end face of the refractory layer of the drain rod being adapted to the hole wall of the second hole and sealing, the slag plug body and the connection part of the slag plug body have good corrosion resistance, effectively reducing the erosion of the slag plug by molten steel, and the slag plug body and the drain rod are not easy to fall off and separate during the slag blocking process, the use of the slag plug is more stable, the success rate of slag blocking is improved, the quality of molten steel is stabilized, and the erosion of the ladle is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model of the slag stopper for converter tapping from the first perspective;

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model of the slag stopper for converter tapping from a second viewing angle;

[0016] Figure 3 This is a schematic cross-sectional view of a slag stopper for tapping a converter according to the present invention;

[0017] Figure 4 yes Figure 3 Schematic diagram of the local structure;

[0018] Figure 5 The utility model is a cross-sectional view of a drainage rod and a clamp of a slag blocking plug for tapping a converter. DETAILED DESCRIPTION

[0019] The preferred embodiment of the slag stopper for tapping steel from a converter of the present invention is described in detail below with reference to the accompanying drawings:

[0020] like Figures 1 to 5 As shown, a slag plug for tapping steel from a converter comprises a slag plug body 1 and a drain rod 2, wherein the slag plug body 1 is in the shape of a truncated cone with a larger upper portion and a smaller lower portion, and a central through hole 10 is vertically opened on the slag plug body 1, and the central through hole 10 comprises a first hole 101 and a second hole 102 distributed in sequence from top to bottom, the first hole 101 is in the shape of a column, and the second hole 102 is in the shape of a truncated cone with a smaller upper portion and a larger lower portion, and the first hole 101 and the second hole 102 are coaxial and connected; the lower part of the drain rod 2 is covered with a drain rod refractory layer 21, and the upper end face 211 of the drain rod refractory layer 21 is a conical surface, and the inclination of the upper end face 211 of the drain rod refractory layer 21 is the same as that of the second The slope of the hole 102 is consistent; the drain rod 2 passes through the central through hole 10 of the slag plug body 1, and the upper end of the drain rod refractory layer 21 extends into the second hole 102, and the upper end face 211 of the drain rod refractory layer 21 is adapted to the hole wall of the second hole 102. A clip 3 is inserted into the top of the first hole 101, and the clip 3 is located between the slag plug body 1 and the drain rod 2. The slag plug body 1, the clip 3 and the drain rod 2 are clamped to each other, and the upper surface of the slag plug body 1 is covered with a connecting part refractory layer 4. The clip 3 and the top of the first hole 101 are both covered in the connecting part refractory layer 4.

[0021] The utility model provides a slag plug for tapping a converter, comprising a slag plug body 1 and a drain rod 2, wherein the slag plug body 1 is adapted to the tapping port and serves as a plug for blocking the tapping port; the drain rod 2 plays a guiding role, so that the slag plug body 1 can accurately fall into the tapping port to seal the tapping port.

[0022] The utility model discloses a slag stopper for tapping steel from a converter. When in use, the slag stopper body 1 floats on the steel slag interface. As the outflow of molten steel decreases, the slag stopper body 1 gradually sinks and, under the guidance of the drainage rod 2, finally falls into the steel tapping port after all the molten steel has been discharged, thereby sealing the steel tapping port. After the steel tapping port is sealed by the slag stopper body 1, the slag above the slag stopper body 1 will not flow into the molten steel from the steel tapping port, thereby completing the slag stopper operation and realizing steel slag separation.

[0023] In the slag stopper for tapping a converter according to the present invention, the central through hole 10 in the slag stopper body 1 is used to pass through the drain rod 2 and be assembled with the drain rod 2. The central through hole 10 includes a first hole 101 and a second hole 102 that are coaxial and connected. The first hole 101 is located above the second hole 102. The first hole 101 is cylindrical, and the second hole 102 is a frustum with a smaller top and a larger bottom. The upper end diameter of the second hole 102 is consistent with the diameter of the first hole 101.

[0024] The utility model is a slag stopper for converter tapping. The lower portion of the drain rod 2 is covered with a drain rod refractory layer 21. The drain rod refractory layer 21 is used to protect the lower portion of the drain rod 2 from corrosion when immersed in molten steel. The upper end surface 211 of the drain rod 2 is a conical surface that adapts to the hole wall of the second hole 102.

[0025] The utility model relates to a slag plug for steel tapping in a converter. During assembly, the upper end of the drain rod 2 passes through the central through hole 10 of the slag plug body 1, and the upper end of the refractory layer 21 of the drain rod extends into the second hole 102. The upper end face 211 of the refractory layer 21 of the drain rod is adapted to and fits with the hole wall of the second hole 102. The top of the first hole 101 is inserted into the clip 3 to fasten the slag plug body 1 and the drain rod 2. The upper surface of the slag plug body 1 is coated with the connecting portion refractory layer 4, and the clip 3 and the top of the first hole 101 are covered in the connecting portion refractory layer 4, so that the clip 3 and the structure in the first hole 101 can be isolated to prevent corrosion.

[0026] According to the utility model, a slag plug for tapping steel from a converter is provided. After the drain rod 2 passes through the central through hole 10 of the slag plug body 1, the clip 3 is directly inserted into the top of the first hole 101. The slag plug body 1 and the drain rod 2 are clamped and fixed by the clip 3. Then, the refractory layer 4 of the connection part is coated on the upper surface of the slag plug body 1. The refractory layer 4 of the connection part is used to protect the clip 3 and the structure inside the first hole 101 from corrosion. The slag plug for steel tapping in the converter, on the one hand, the slag plug body 1 and the drain rod 2 are directly clamped and fixed by the clip 3, compared with filling the small gap between the slag plug body and the drain rod with refractory material and the fixing structure bonded by the refractory material, the fixing structure clamped by inserting the clip 3 is not only simple to assemble, but also the rigid fastening of the clip 3 is more reliable and stronger than the bonding of the refractory material, and the slag plug body 1 and the drain rod 2 are not easy to fall off and separate; on the other hand, the refractory layer 4 of the connection part is coated on the upper surface of the slag plug body 1 to prevent corrosion of the clip 3 and the structure in the first hole 101, while the operation is convenient, because the refractory layer 4 of the connection part is located on the upper surface of the slag plug body 1 and has less contact with the molten steel, the refractory layer 4 of the connection part has stronger corrosion resistance, better protection for the clip 3 and the structure in the first hole 101, weakening the corrosion of the molten steel on the slag plug, and extending the service life of the slag plug.

[0027] The utility model provides a slag plug for tapping steel from a converter. The central through hole 10 includes a truncated cone-shaped second hole 102, and the upper end face 211 of the refractory layer 21 of the drain rod is a conical surface. After the drain rod 2 passes through the central through hole 10 of the slag plug body 1, the upper end of the refractory layer 21 of the drain rod can be extended into the second hole 102, and the upper end face 211 of the refractory layer 21 of the drain rod is adapted to the hole wall of the second hole 102. Under this structure, when force is applied to make the upper end face 211 of the refractory layer 21 of the drain rod adapt to the hole wall of the second hole 102, a part of the force between the upper end face 211 of the refractory layer 21 of the drain rod and the hole wall of the second hole 102 can be decomposed into a force in the horizontal direction. The force in the horizontal direction squeezes the hole wall of the second hole 102, so that a pre-tightening force can be formed between the refractory layer 21 of the drain rod and the second hole 102. The horizontal pre-tightening force can make the sealing between the refractory layer 21 of the drain rod and the slag plug body 1 better, and can effectively prevent molten steel from entering the central through hole 10 from the second hole 102, thereby avoiding corrosion in the central through hole 10.

[0028] The utility model discloses a slag plug for tapping steel from a converter. The fastening structure of the clip 3 for the slag plug body 1 and the drain rod 2, combined with the structural setting of the refractory layer 4 of the connection part and the upper end face 211 of the refractory layer 21 of the drain rod and the hole wall of the second hole 102, makes the assembly operation of the slag plug not only simple and convenient, but also has strong structural firmness after assembly. At the same time, under the structure that the refractory layer 4 of the connection part at the upper and lower ends of the slag plug body 1 and the upper end face 211 of the refractory layer 21 of the drain rod and the hole wall of the second hole 102 are adapted and sealed, the slag plug body 1 and the connection part of the slag plug body 1 have good corrosion resistance, effectively reducing the erosion of the slag plug by molten steel. During the slag blocking process, the slag plug body 1 and the drain rod 2 are not easy to fall off and separate, the use of the slag plug is more stable, the success rate of slag blocking is improved, the quality of molten steel is stabilized, and the erosion of the ladle is reduced.

[0029] In the present utility model, the slag stopper for converter tapping is preferably configured such that the clip 3 is thicker at the top and thinner at the bottom, and the cross-section of the clip 3 is arcuate. After the clip 3, which is thicker at the top and thinner at the bottom, is placed within the first hole 101 and between the slag stopper body 1 and the drain rod 2, it is easily tightened as it is squeezed downward. The clip 3, with its arcuate cross-section, better fits the gap between the slag stopper body 1 and the drain rod 2, making it easier to insert into the gap between the slag stopper body 1 and the drain rod 2.

[0030] In the slag stopper for tapping a converter of the present invention, preferably, the number of the clips 3 is two, and the two clips 3 are respectively located on two opposite sides of the drain rod 2. The two clips 3 are respectively located on two opposite sides of the drain rod 2. When the slag stopper plug body 1 and the drain rod 2 are clamped, the coaxiality of the slag stopper plug body 1 and the drain rod 2 is higher, and the upper end face 211 of the refractory layer 21 of the drain rod below the slag stopper plug body 1 is better adapted to the hole wall of the second hole 102.

[0031] In the utility model, the slag stopper plug for converter steel tapping is preferably configured such that the connection portion refractory layer 4 is conical. The conical connection portion refractory layer 4 not only has a lower surface with a large contact surface with the upper surface of the slag stopper plug body 1 and a high upward height, but also has a large contact surface with the drain rod 2. The connection portion refractory layer 4 having a large contact surface with both the slag stopper plug body 1 and the drain rod 2 can greatly protect the space between the slag stopper plug body 1 and the drain rod 2, as well as the clip 3, from corrosion.

[0032] The utility model relates to a slag stopper for steel tapping from a converter. Preferably, a molten steel guide groove 11 is provided on the peripheral wall of the slag stopper body 1, and the upper end of the molten steel guide groove 11 is closed and the lower end is open. The molten steel guide groove 11 is provided to divert the molten steel, accelerate the outflow of the molten steel, and make the outflow of the molten steel smoother. Under the structure in which the upper end of the molten steel guide groove 11 is closed and the lower end is open, the slag from above cannot enter the molten steel guide groove 11 with its upper end closed and be mixed into the molten steel, while the molten steel from below can enter the molten steel guide groove 11 and flow out along the molten steel guide groove 11. In other words, the molten steel guide groove 11 with its upper end closed and its lower end open can not only divert the molten steel, but also prevent the slag from above from entering the molten steel guide groove 11, thereby greatly improving the effect of slag separation.

[0033] In the utility model of the slag stopper for converter steel tapping, preferably, the number of the molten steel guide grooves 11 is three, and the three molten steel guide grooves 11 are evenly distributed along the circumference of the slag stopper body 1.

[0034] For ordinary technicians in the technical field to which the utility model belongs, the utility model can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as falling within the scope of protection of the utility model.

Claims

1. A slag plug for tapping a converter, comprising a slag plug body and a drainage rod, wherein the slag plug body is in the shape of a truncated cone with a larger upper portion and a smaller lower portion, and a central through hole is vertically opened on the slag plug body, characterized in that: The central through hole includes a first hole and a second hole distributed in sequence from top to bottom, the first hole is cylindrical, the second hole is a truncated cone with a smaller top and a larger bottom, the first hole and the second hole are coaxial and connected; the lower part of the drain rod is covered with a drain rod refractory layer, the upper end face of the drain rod refractory layer is a conical surface, and the inclination of the upper end face of the drain rod refractory layer is consistent with the inclination of the wall of the second hole; the drain rod passes through the central through hole of the slag plug body, the upper end of the drain rod refractory layer extends into the second hole, the upper end face of the drain rod refractory layer is adapted to the wall of the second hole, a clip is inserted into the top of the first hole, the clip is located between the slag plug body and the drain rod, the slag plug body, the clip and the drain rod are clamped to each other, the upper surface of the slag plug body is covered with a connecting part refractory layer, and the clip and the top of the first hole are both covered in the connecting part refractory layer.

2. The slag stopper for converter tapping according to claim 1, characterized in that: The clip is thick at the top and thin at the bottom, and the cross section of the clip is arc-shaped.

3. The slag stopper for converter tapping according to claim 1, characterized in that: There are two clips, and the two clips are respectively located on two opposite sides of the drainage rod.

4. The slag stopper for converter tapping according to claim 1, characterized in that: The refractory layer of the connecting portion is conical.

5. The slag stopper for converter tapping according to claim 1, characterized in that: A molten steel guide groove is provided on the peripheral wall of the slag blocking plug body, wherein the upper end of the molten steel guide groove is closed and the lower end is open.

6. The slag stopper for converter tapping according to claim 5, characterized in that: The number of the molten steel guide grooves is three, and the three molten steel guide grooves are evenly distributed along the circumference of the slag blocking plug body.

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