Converter slag blocking device for improving installation precision of matching bricks and stability of mechanism surface pressure

Abstract

The present application discloses a converter slag blocking device, in which a raised platform and a butt joint platform are arranged in the brick arrangement, and the bowl brick is cancelled, the service life of the brick arrangement and the taphole is improved, the original brick arrangement and the easy brick arrangement are arranged, the precision of the brick arrangement installation is improved, the brick arrangement pressing plate is a flat plate type and is provided with a stepped lifting hole and a lifting hook in the lifting hole, the bending deformation of the brick arrangement pressing plate is reduced, the quick lifting problem of the brick arrangement pressing plate is solved, the precision of the brick arrangement installation is further improved, the brick arrangement overhang of the buffer base, the pressing plate relaxation chamber and the bolt stretching pool are arranged, the flexible fire clay contact between the buffer base and the brick arrangement is ensured at all times, the problems of the bending deformation of the inner slide plate cavity plate, the plate surface crack fracture of the inner slide plate, the slide plate clamping steel and the like caused by the over-high installation of the brick arrangement and the brick arrangement pressing plate are solved, and the stability of the mechanism surface pressure is obviously improved, the converter slag blocking device is safe and long in service life, stable in operation, low in comprehensive cost and simple in operation and maintenance.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking machinery, and specifically relates to a converter slag-blocking device installed at the converter tapping port for slag blocking and tapping using a converter sliding plate, which improves the online brick-making installation accuracy and the stability of the sliding plate surface pressure. Background Technology

[0002] In modern converter steelmaking, when tapping steel using the sliding plate slag-blocking method, molten steel in the furnace is injected into the ladle through a refractory steel channel composed of the converter tapping port body, disc bricks, inner sliding plate, outer sliding plate, and outer nozzle bricks. When the slag detection system detects slag during tapping, the hydraulic cylinder drives the slag-blocking mechanism to quickly close the steel channel, thereby retaining slag in the furnace and reducing slag discharge. This method is currently the most effective slag-blocking tapping method.

[0003] Currently, the commonly known standard on the market connects the reference plate and the outlet flange together. The outlet seat brick is installed on one side of the reference plate and is concentric with the center hole of the reference plate. The outlet assembly generally consists of the outlet body and the disc brick. Before leaving the factory, in order to improve the service life of the disc brick and the service life of the outlet assembly, the outlet body and the disc brick are bonded together with high-temperature adhesive. When the outlet needs to be replaced, use a special outlet tool to fix the outlet assembly in the groove of the connecting plate pressure plate, so that the surface of the disc brick is flush with the surface of the connecting plate. Then, fill the gap between the outlet assembly and the outlet seat brick with outlet filler. After they are fixedly connected, remove the special outlet tool and tighten the pressure plate bolts with a pneumatic tool to fix the disc brick pressure plate in the groove of the connecting plate and fix the outlet assembly in the center hole of the connecting plate, thus completing the replacement of the outlet assembly. To extend the service life of the tapping spout and slag-blocking slide plate, the old disc bricks need to be removed after a period of use. New disc bricks coated with fire putty are then installed on the tapping spout body inside the center hole of the connecting plate. The disc brick pressure plate is then quickly placed on the pressure slope of the disc brick and pressed against it. The pressure plate bolts are tightened with a pneumatic tool to ensure that the disc brick pressure plate is pressed against the pressure slope of the disc brick and the disc brick is installed on the tapping spout body, thus completing the individual replacement of the disc bricks.

[0004] Currently, the commonly known disc brick pressure plate is typically a stepped structure, with its thickness generally the same as the depth of the connecting plate pressure plate groove. The thickness of the waist hole groove plate in the middle of the disc brick pressure plate is generally 8-10mm. In the process of replacing the disc brick at the steel outlet separately, the disc brick and the steel outlet body are connected together by high-temperature molten ladle. When replacing the disc brick, the thickness of the molten ladle joint between the disc brick and the steel outlet body is 2-5mm. However, the thickness of the adhesive joint between the disc brick and the steel outlet body of the steel outlet assembly is 0.1-0.4mm. Compared with the thickness of the molten ladle joint, the thickness of the adhesive joint in the steel outlet assembly is less than one-tenth of the thickness of the molten ladle joint when replacing the disc brick. The thickness of the adhesive joint is very small and can be ignored. Since the position of the steel outlet body remains unchanged and the new disc brick is exactly the same size as the old disc brick, replacing the new disc brick... The brick protrudes above the surface of the connecting plate, and the height of this protrusion is equal to the thickness of the mortar joint between the disc brick and the steel outlet body. This thickness is 2-5mm. This will cause the following problems: 1. After the disc brick is replaced individually and the pressure plate bolts are tightened, one side of the disc brick pressure plate is tightly attached to the pressure plate groove, while the other side is lifted by the pressure slope of the disc brick, leaving the middle of the disc brick pressure plate in a suspended state. Under the tightening force of the pressure plate bolts, the weak part of the waist hole groove plate of the disc brick pressure plate is prone to deformation. When the disc brick is replaced with a deformed disc brick pressure plate, during the process of tightening the pressure plate bolts and locking the disc brick with a pneumatic tool, the deformation of the disc brick pressure plate makes it impossible for the back of the disc brick pressure plate to fit together with the pressure plate groove. This results in a decrease in the pressure force of the disc brick pressure plate on the disc brick and an increase in the thickness of the mortar joint, affecting the installation quality and performance of the disc brick. 2. When replacing a disc brick individually, after applying fire putty to the male end of the disc brick, place it onto the steel outlet body inside the center hole of the connecting plate. At this time, the fire putty on the male end of the disc brick is not compressed, and the pressure slope of the disc brick is higher than the bottom surface of the pressure plate groove of the connecting plate. Before tightening the pressure plate bolts, one end of the pressure slope of the disc brick pressure plate in the pressure plate groove must be lifted and placed on the pressure slope of the disc brick. Then, push the disc brick pressure plate to make it close to the disc brick before tightening the pressure bolts to fix the disc brick above the steel outlet body, thus completing the disc brick replacement work. During the plate-changing process, because the thickness of the disc brick pressure plate is basically the same as that of the pressure plate groove, it is very difficult for operators to directly grasp the disc brick pressure plate by hand due to wearing protective gloves. In order to improve the speed of disc brick replacement, the scorching hot disc brick pressure plate is often used continuously on site, which further increases the difficulty of directly grasping the disc brick pressure plate, prolongs the disc brick replacement time, and causes the fire putty on the male end of the disc brick to lose moisture and harden prematurely under the red-hot high temperature of the tapping body, increasing the gaps in the fire putty of the disc brick, and increasing the height of the disc brick protruding from the surface of the connecting plate after installation. 3. The disc bricks that are replaced separately protrude above the connecting plate, which poses a serious safety hazard to the subsequent online replacement of the slag-blocking mechanism and slag-blocking tapping.

[0005] The next step is to replace the slag-blocking mechanism online. Place the slag-blocking mechanism above the locating pin on the connecting plate and push it forcefully against the connecting plate. The instant the slag-blocking mechanism contacts the connecting plate, the inner sliding plate automatically aligns with the steel outlet disc brick. The fire putty applied to the male end of the inner sliding plate is squeezed outwards by the inertial force of the slag-blocking mechanism and forced into the space between the disc brick surface and the sliding plate cavity of the mechanism base. Then, as the four hinge nuts are tightened with a pneumatic tool to fix the slag-blocking mechanism to the connecting plate, the mechanism base gradually approaches the connecting plate until the pneumatic tool can no longer penetrate. Due to factors such as the installation height of the disc brick, the thickness of the sliding plate cavity of the mechanism base, and the tightening force of the hinge nuts, the sliding plate cavity of the mechanism base will be lifted by the disc brick and fire putty, causing deformation of the sliding plate cavity. This will lead to the following consequences:

[0006] Problem 1: For small and medium-sized slag-blocking mechanisms under 150 tons currently on the market, the thickness of the sliding plate cavity of the mechanism base is generally 10-12mm. The sliding plate cavity itself has weak resistance to deformation. See patent CN 103525973 B "A Sliding Plate Slag-Blocking Steelmaking Converter Mechanism". When the disc brick is replaced separately, the locking force of the four hinge nuts of the slag-blocking mechanism is large enough. Considering the thickness of the fire mud that is forcibly squeezed into the gap between the disc brick surface and the sliding plate cavity of the mechanism base, the deformation of the sliding plate cavity is generally close to the height of the disc brick above the surface of the connecting plate. This greatly exceeds the safe deformation required by the mechanism base and creates serious safety hazards. In the long run, the mechanism base will suffer serious permanent deformation, leading to premature scrapping of the mechanism base, significantly reduced service life, and increased production costs. The base slide plate of the large slag-blocking mechanism is relatively thick and has high resistance to deformation. However, under the combined action of the strong inward locking force of the four hinge nuts and the outward pushing force of the disc bricks, and considering the influence of the thickness of the fire clay between the surface of the disc bricks and the base slide plate, the slide plate still deforms outward to a certain extent. Over time, the deformation of the slide plate accumulates and increases until it exceeds the safe deformation limit required by the base, reducing the service life of the base and posing a safety hazard to steelmaking production. Furthermore, the unchanged height of the middle slide plate of the base, which is lifted by the disc bricks, leads to an increase in the gap between the base and the surface of the connecting plate, resulting in a decrease in the stability of the slag-blocking mechanism.

[0007] Question 2: Before the slag-blocking mechanism was replaced, the back of the inner sliding plate and both sides of the sliding surface were subjected to uniform and equal forces (approximately equal to the surface pressure, which is ≥10 tons). After the slag-blocking mechanism was replaced online, when the base sliding plate cavity was deformed by the disc bricks, disc brick pressure plates, and fire clay, only the area around the aperture of the inner sliding plate was simultaneously lifted by the sliding plate cavity, leaving the other parts suspended. The force on the back of the inner sliding plate was mainly concentrated around the aperture. Under the pressure of the sliding surface of the inner sliding plate, the short and long sides of the back of the inner sliding plate were deformed, with the long side deforming more severely. This caused cracks and fractures to easily occur around the aperture of the inner sliding plate, especially on both sides of the aperture. When the slag-blocking mechanism was used for steel tapping, the inner sliding plate was damaged prematurely. In severe cases, this caused steel to be sandwiched between the inner and outer sliding plates, reducing the service life of the slag-blocking sliding plate. In severe cases, it caused steel leakage accidents between the inner and outer sliding plates and burned out the slag-blocking mechanism, seriously affecting steelmaking production.

[0008] Question 3: After the slag-blocking mechanism is replaced online, the base slide plate is lifted by the disc bricks, disc brick pressure plates, and fire clay. Simultaneously, the inner slide plate is lifted by the slide plate cavity plate and the inner slide plate fire clay. This causes the outer slide plate, sliding frame, and opening / closing frame of the slag-blocking mechanism to be lifted at the same time. With the surface pressure bolts remaining fixed, the spring compression increases by 2-6 mm, leading to a sharp increase in the surface pressure of the mechanism (normal spring compression is 9-13 mm). At the same time, the steel clamping phenomenon between the inner and outer slide plates caused by the inner slide plate being lifted further increases the resistance to opening and closing the slide plate. For small and medium-sized slag-blocking mechanisms under 150 tons, the increase in surface pressure caused by the slide plate cavity plate lifting the inner slide plate can reach more than 50% in severe cases. This causes a sharp increase in the force required for the hydraulic cylinder to drive the slide plate, which can easily lead to a major and serious production accident where the hydraulic cylinder cannot drive the slide plate during slag blocking and the slag blocking fails. To prevent such slag-blocking accidents, after the slag-blocking mechanism is replaced online, on-site operators often use pneumatic tools to directly loosen the four face pressure bolts to reduce the face pressure of the mechanism. Due to the steelmaking operating environment and human factors, the direct loosening of the face pressure bolts can easily lead to uneven face pressure on both sides of the mechanism and insufficient face pressure. In severe cases, it can cause serious production accidents such as steel leakage in the slide plate and burning of the slag-blocking mechanism.

[0009] Currently, disc bricks are typically disc-shaped and relatively thin overall, with a center nozzle thickness S generally between 70 and 75 mm. This results in relatively low resistance to molten steel erosion and a short service life. To further improve the service life of disc bricks, a bowl brick is usually added between the disc brick and the outlet body in the outlet assembly. To extend the service life of both the bowl brick and the outlet assembly, they are bonded together with high-temperature adhesive. The adhesive joint thickness between the bowl brick and the outlet body is 0.1–0.4 mm. Generally, in the early and middle stages of outlet use, the bowl brick does not need to be replaced; only the disc brick needs to be replaced. In the later stages of outlet use, the bowl brick is replaced along with the disc brick. Therefore, the addition of the bowl brick has limited effect on improving the service life of the outlet. After the disc bricks were replaced at the same time, a bowl brick mortar joint was added between the steel outlet body and the bowl brick. The sum of the bowl brick mortar joint thickness and the disc brick mortar joint thickness reached 4-10mm. Compared with the sum of the bowl brick mortar joint thickness and the disc brick mortar joint thickness, the sum of the disc brick mortar joint thickness and the bowl brick mortar joint thickness in the steel outlet assembly was less than one-tenth of the sum of the bowl brick mortar joint thickness and the disc brick mortar joint thickness. The sum of the disc brick mortar joint thickness and the bowl brick mortar joint thickness was very small and could be ignored. At this time, the height above the connecting plate after the pressure replacement was completed was the sum of the bowl brick mortar joint thickness and the disc brick mortar joint thickness, which reached 4-10mm. This further increased the disc brick installation height, which will cause more serious safety hazards to the online replacement of the slag-blocking mechanism and the slag-blocking steel outlet in the next step: (1) The bending deformation of the mechanism base is more serious, which will reduce the service life of the slag-blocking mechanism and cause it to be scrapped. The bending deformation of the disc brick pressure plate increases, which further reduces the installation quality of the disc brick replacement. The reduction in the quality of the disc brick replacement further aggravates the bending deformation of the mechanism base and the disc brick pressure plate. (2) After the bowl brick and the disc brick are replaced together, the force distribution on the back of the inner slide plate becomes more uneven, which makes accidents such as cracks and fractures on the inner slide plate surface and steel clamping between the inner and outer slide plates more likely to occur, further reducing the service life of the slide plate and the safety of the slag-blocking mechanism. (2) After the bowl brick and the disc brick are replaced together, the spring compression increases, which exacerbates the fluctuation of the surface pressure value of the mechanism and further reduces the stability of the surface pressure of the mechanism. When the slide plate blocks slag, the middle slide plate cannot be opened or closed due to insufficient driving force of the hydraulic cylinder, which further increases the probability of production accidents caused by the failure of the slide plate to block slag. Summary of the Invention

[0010] To address the aforementioned problems, this invention proposes a converter slag-blocking device that improves the accuracy of brick installation and the stability of the mechanism's surface pressure.

[0011] The technical solution of this invention is: a converter slag-blocking device that improves the installation accuracy of brick distribution and the stability of the surface pressure of the mechanism, comprising:

[0012] The system comprises a connecting plate, a reference plate, a slag-blocking mechanism, bricks, and a steel outlet body. The connecting plate and the reference plate are connected together. The slag-blocking mechanism is installed on the outside of the connecting plate and the bricks. The slag-blocking mechanism includes a buffer base, an inner sliding plate, an opening and closing frame, a sliding frame, an outer sliding plate, an outer water inlet, an outer water inlet seat, a clamping device, and a mechanism guard plate. The connecting plate is characterized by having a water-cooled oil cylinder drive device on its upper part. The steel outlet body is located in the central hole of the reference plate, and bricks are located in the central hole of the connecting plate. The bricks are concentric with and connected to the steel outlet body. Pressure plate grooves are provided on both sides of the central hole of the connecting plate, and brick pressure plates are installed in the pressure plate grooves. The two brick pressure plates are fixed in the pressure plate grooves with pressure plate bolts and pressed against both sides of the bricks. The buffer base is located on the outside of the connecting plate and the bricks. A sliding frame and an opening / closing frame are arranged sequentially on the outer side. An outer water inlet seat, a mechanism guard plate, and a clamping device are arranged sequentially on the outer side of the sliding frame. The buffer base is connected to the opening / closing frame with face-pressure bolts. The sliding frame is installed inside the opening / closing frame. Spring chambers and fixed slide rails are respectively arranged on both sides of the opening / closing frame. Face-pressure springs are installed in the spring chambers. Movable slide rails corresponding to the fixed slide rails are arranged on both sides of the sliding frame. The inner slide plate is installed in the inner slide plate brick cavity of the buffer base. The outer slide plate is installed in the brick cavity of the sliding frame. The outer water inlet is fixed to the outer side of the outer slide plate with a clamping device. The buffer base has a brick-feeding passage corresponding to the brick-feeding position. On both sides of the brick-feeding passage are pressure plate release chambers corresponding to the positions of the two brick-feeding pressure plates. The buffer base has a bolt extension pool corresponding to the position of the pressure plate bolts.

[0013] Preferably, the brick-filling cylinder and the raising platform have a through-center hole in the middle of the brick-filling cylinder, two pressure-bearing inclined surfaces symmetrically arranged on the left and right sides of the cylinder, a steel hoop on the outer side of the cylinder, and the raising platform is frustum-shaped. The steel outlet body has a raising groove that matches the size of the raising platform. The top of the cylinder is set as a docking platform, and the connection method between the female or male brick-filling cylinder and the inner sliding plate is set as a flat connection, a male-female connection, or a female-female connection.

[0014] Preferably, the bricks are provided in two specifications: original bricks and easy-to-use bricks. The original bricks have a height of M, and the easy-to-use bricks have a height of...

[0015] The degree is N, M>N, and the difference between M and N is 2-5mm. The original brick and the easy-to-use brick are exactly the same in all dimensions except for the height. The original brick is used in the steel outlet assembly and is bonded to the steel outlet body with high-temperature adhesive. The thickness of the brick joint between the original brick and the steel outlet body is 0.1-0.4mm. The easy-to-use brick is used for replacement on the production site and is connected to the steel outlet body with high-temperature mortar. The thickness of the mortar joint between the easy-to-use brick and the steel outlet body is 2-5mm.

[0016] Preferably, the brick-filling recess is located on the back of the buffer base and is concentric with the center hole of the water inlet of the buffer base. The diameter of the brick-filling recess is larger than the outer diameter of the brick-filling cylinder, and the depth of the brick-filling recess is 3-5 mm greater than the thickness of the brick-filling mortar joint.

[0017] Preferably, the brick-feeding pressure plate is configured as a flat plate structure with a waist-shaped through hole in the middle. The thickness of the brick-feeding pressure plate is 2-5 mm less than the depth of the pressure plate groove. A stepped lifting hole and a pressing slope are provided on one side of the brick-feeding pressure plate, and the pressing slope matches the size of the pressing slope of the brick-feeding plate.

[0018] Preferably, the stepped lifting hole of the brick-feeding pressure plate is provided with a lifting hook. One end of the lifting hook is an L-shaped lifting head, the other end is a clearing cone head, and the middle is cylindrical or square. The size of the L-shaped lifting head is adapted to the size of the stepped lifting hole of the brick-feeding pressure plate.

[0019] Preferably, the pressure plate release chamber is located on both sides of the central hole of the water inlet of the buffer base and is arranged symmetrically. Its width is greater than the width of the pressure plate groove of the connecting plate, the total length of the pressure plate release chamber on both sides is greater than the total length of the pressure plate groove on both sides of the connecting plate, and the depth of the pressure plate release chamber is not less than the thickness of the brick mortar joint.

[0020] Preferably, the bolt extension pool is located on both sides of the central hole of the buffer base water inlet and is arranged symmetrically. The diameter of the bolt extension pool is larger than the diameter of the pressure plate bolt head, and the depth of the bolt extension pool is greater than or equal to the thickness of the pressure plate bolt head.

[0021] The beneficial effects of this invention are:

[0022] 1. The brick-raising platform and docking platform of this invention significantly increase the height of the bricks. Compared with disc bricks, the path length of molten steel flowing through the bricks during slag-blocking tapping is significantly increased, which significantly improves the bricks' resistance to molten steel erosion and service life. After replacing the "disc brick + bowl brick" combination with bricks, the bowl bricks are only replaced at the same time as the disc bricks in the middle and later stages of the tapping process, so the improvement in the service life of the tapping outlet is limited. Therefore, the service life of the tapping outlet is longer after using bricks. After eliminating the bowl bricks, the mortar joint between the tapping outlet body and the bowl bricks is correspondingly eliminated, reducing the number of mortar joints during tapping outlet installation and improving the installation accuracy of the bricks. The safety performance of the tapping outlet is effectively guaranteed, while reducing the labor intensity of on-site workers and improving the safety and stability of the tapping outlet and slag-blocking mechanism during slag-blocking tapping.

[0023] 2. Two types of bricks are provided: original bricks and easy-to-use bricks. The height difference between the original bricks and easy-to-use bricks is 2-4mm. The original bricks and easy-to-use bricks have identical dimensions for the raising platform and other aspects. The two types of bricks have different uses. The original bricks are used in the taphole assembly and are bonded to the taphole body with a high-temperature adhesive with a thickness of 0.1-0.4mm. The easy-to-use bricks are used for individual replacement and are bonded to the taphole body with a high-temperature mortar with a thickness of 2-5mm. Compared with the thickness of the mortar between the easy-to-use bricks and the taphole body, the thickness of the high-temperature adhesive bonded between the original bricks and the taphole body is very small and can be ignored. The height difference between the easy-to-use bricks and the original bricks is basically the same as the thickness of the mortar between the easy-to-use bricks and the taphole body. This ensures that after the easy-to-use bricks are replaced individually, they are flush with or slightly higher than the connecting plate by 0-2mm. This greatly improves the accuracy of the brick installation and creates favorable conditions for the subsequent replacement of the slag-blocking mechanism and the improvement of the stability and safety of the mechanism's surface pressure.

[0024] 3. The setting of the brick-filling passage on the back of the buffer base: When replacing the slag-blocking mechanism, the moment the slag-blocking mechanism is pushed towards the connecting plate and contacts the connecting plate, the buffer base and inner sliding plate automatically align with the brick-filling. The fire mortar applied to the male opening of the inner sliding plate is automatically squeezed between the brick-filling and the brick-filling passage. During the process of tightening the hinge nut to fix the slag-blocking mechanism using a pneumatic tool, the fire mortar is further squeezed, and the excess fire mortar is squeezed into the middle aperture and the brick-filling passage. The part of the brick that protrudes above the surface of the connecting plate all enters the brick-filling passage. Since the depth of the brick-filling passage is 3-5mm greater than the thickness of the brick-filling mortar joint, the brick-filling passage... The diameter is larger than the outer diameter of the brick, ensuring flexible mortar contact between the bricks and the brick-retaining groove. This greatly reduces the outward pushing force of the bricks on the buffer base during the installation of the slag-blocking mechanism. The setting of the pressure plate release chamber allows the brick pressure plate to automatically align into the pressure plate release chamber when the slag-blocking mechanism is replaced. The part of the brick pressure plate that protrudes above the connecting plate automatically enters the pressure plate release chamber. Since the depth of the pressure plate release chamber is not less than the thickness of the brick mortar joint, and the thickness of the brick pressure plate is less than the depth of the pressure plate groove by about 2-5mm, direct contact between the brick pressure plate and the pressure plate release chamber is eliminated. The setting of the brick-retaining groove and the pressure plate release chamber significantly reduces the installation cost of the slag-blocking mechanism. During installation, due to the excessive height of the bricks and brick pressure plates, and the outward pushing force of the mortar squeezed between the back of the buffer base and the bricks, the bending deformation of the inner sliding plate cavity caused by this pushing force was significantly reduced, falling well within the safe deformation range required by the buffer base. Because the bending deformation of the inner sliding plate cavity significantly reduced the height of the inner sliding plate, the force distribution on the back of the inner sliding plate was significantly improved and became more uniform. When the inner sliding plate was lifted, the spring compression increment and mechanism surface pressure increment caused by simultaneously lifting the outer sliding plate, sliding frame, and opening / closing frame decreased, making the mechanical surface pressure more stable. This resolved the problem caused by the excessive height of the brick installation. This addresses issues such as bending deformation of the inner sliding plate cavity, cracks and fractures on the inner sliding plate surface caused by bending deformation, steel clamping between the inner and outer sliding plates, and excessive fluctuations in the surface pressure of the mechanism. It improves the stability of the surface pressure of the slag-blocking mechanism and the service life of the sliding plate. After the slag-blocking mechanism is used and the pressure is released, the bending deformation of the inner sliding plate cavity is very small and can generally recover on its own, greatly reducing the occurrence of permanent bending deformation of the inner sliding plate cavity and significantly improving the service life of the buffer base. At the same time, the significant reduction in the outward thrust of the buffer base makes the connection between the buffer base and the connecting plate more secure and the contact tighter.

[0025] 4. The brick-laying pressure plate is designed as a flat plate with a central oblong through-hole. This significantly increases the thickness of the pressure plate compared to the oblong groove of current disc brick pressure plates, thereby significantly improving its resistance to bending deformation. When used in conjunction with the bricks, the service life of the pressure plate is significantly extended, and the installation quality and accuracy of the bricks are effectively guaranteed. Simultaneously, the thickness of the pressure plate is set 2-5mm lower than the groove of the connecting plate, and a pressure plate release chamber is provided on the back of the buffer base, completely avoiding the impact of the pressure plate being higher than the connecting plate on the buffer base.

[0026] 5. The setting of the pressure plate release chamber reduces the occurrence of mechanical buffer base deformation caused by the excessive thickness and excessive installation height of the current disc brick pressure plate, as well as the occurrence of inner slide plate cracks and fractures caused by the inner slide plate being simultaneously lifted by the buffer base. This makes the slag blocking mechanism of the present invention not only fully adaptable to the brick distribution pressure plate of the present invention, but also better adaptable to the current disc brick pressure plate.

[0027] 6. The setting of the bolt extension pool on the back of the buffer base allows the pressure plate bolts to automatically align into the bolt extension pool when the slag-blocking mechanism is replaced. Furthermore, there is a 4-8mm gap between the top surface of the large head of the pressure plate bolt and the bottom surface of the bolt extension pool, which eliminates the influence of the pressure plate bolts being higher than the connecting plate on the buffer base after the brick replacement is completed, thus ensuring the normal installation of the slag-blocking mechanism.

[0028] 7. A lifting hole is provided at one end of the brick-feeding pressure plate, and the lifting hole is set in a stepped shape. The setting of the unblocking cone at one end of the lifting hook can quickly clean the debris in the stepped lifting hole. The setting of the L-shaped lifting head at one end of the lifting hook ensures that when changing the steel outlet assembly and easy-to-feed bricks, no matter how hot the brick-feeding pressure plate is, it is not necessary to handle it directly by hand. Just insert the lifting hook into the lifting hole of the brick-feeding pressure plate and quickly lift it to lift the brick-feeding pressure plate from the pressure plate groove of the connecting plate and place it on the pressure slope of the brick. This saves the time of locking the brick-feeding pressure plate, improves the brick replacement speed, reduces the hardening degree of wet mortar during the brick replacement process, reduces the thickness of the brick mortar joint, and improves the accuracy of brick installation.

[0029] This invention improves the brick-mixing system by adding a raised platform and a docking platform, eliminating the need for bowl-shaped bricks. This enhances the bricks' resistance to molten steel erosion and extends their service life, effectively ensuring the safety of the steel outlet. The inclusion of both original and easily replaceable bricks ensures that after installation, the bricks are essentially flush with or slightly higher (0-2mm) than the connecting plate surface, significantly improving installation accuracy and reliability. The brick-mixing pressure plate is a flat plate with a stepped lifting hole at one end, increasing its structural strength and reducing bending deformation during installation and use. This also increases the pressure of the pressure plate on the bricks. The lifting hook within the lifting hole solves the problem of rapid lifting of the pressure plate during brick replacement, saving replacement time and further improving installation accuracy. The improved brick installation accuracy, along with the addition of a brick overflow chamber, pressure plate release chamber, and bolt extension pool on the back of the buffer base, ensures that the buffer base and the brick body remain in flexible fire-resistant contact during the replacement of the slag-blocking mechanism. This significantly reduces the impact of excessively high brick installation and pressure plate installation on the buffer base, and significantly reduces the bending deformation of the inner sliding plate cavity. It solves the problem of severe bending deformation of the inner sliding plate cavity, as well as the problems of uneven stress on the inner sliding plate, cracks and fractures, steel clamping between the inner and outer sliding plates, and excessive fluctuations in the surface pressure of the mechanism caused by severe bending deformation of the inner sliding plate cavity. This significantly improves the stability of the surface pressure of the slag-blocking mechanism, ensuring the safe and efficient operation of the sliding plate slag blocking system. It has good safety, low operating cost, simple structure, and low labor intensity, making it an ideal replacement for current converter slag blocking devices, especially for converters below 150 tons. Attached Figure Description

[0030] Figure 1 It is a three-dimensional structural diagram of the current steel outlet assembly installation (1 / 4 section of the center hole position, of which the disc brick and bowl brick are 1 / 2 section, hiding the hydraulic cylinder drive device), and a three-dimensional structural diagram of the center hole position of the disc brick (1 / 4 section).

[0031] Figure 2 This is a longitudinal cross-sectional view after the replacement of the bowl bricks and plate bricks, as well as the replacement of the slag-blocking mechanism (horizontal mounting) (only the base and inner sliding plate of the slag-blocking mechanism are shown, while the hydraulic cylinder drive device and other parts of the slag-blocking mechanism are hidden).

[0032] Figure 3 yes Figure 2 A magnified view of a portion at point F;

[0033] Figure 4 This is a three-dimensional structural diagram of the steel outlet assembly installation of the present invention (1 / 4 section of the center hole position, of which the brick is 1 / 2 section, concealing the hydraulic cylinder drive device), and a three-dimensional structural diagram of the center hole position of the combined brick;

[0034] Figure 5 This is a three-dimensional structural diagram of the brick pressing plate of the present invention (1 / 4 section at the center hole position).

[0035] Figure 6 This is a three-dimensional structural diagram of the individual brick replacement process of the present invention (1 / 4 section of the center hole position, of which the brick is 1 / 2 section, and the hydraulic cylinder drive device is hidden), and a three-dimensional structural diagram of the center hole position of the easily matched brick 1 / 4 section.

[0036] Figure 7 yes Figure 6 A magnified view of part Q;

[0037] Figure 8 A 1 / 4 cross-sectional view of the center hole of the buffer base of the present invention;

[0038] Figure 9 A schematic diagram of the three-dimensional structure of the lifting hook of this invention;

[0039] Figure 10 This is a cross-sectional view of the present invention after the easy-to-use bricks and the slag-blocking mechanism have been replaced.

[0040] Figure 11 yes Figure 10 A magnified view of point K.

[0041] In the diagram, 10. Connecting plate, 101. Pressure plate groove, 102. Connecting plate surface, 11. Hinged nut, 12. Disc brick pressure plate, 122. Waist-shaped slot, 13. Pressure plate bolt, 14. Locating pin, 15. Skid slot, 16. Base plate, 161. Bolt countersunk hole, 20. Deformed disc brick pressure plate, 22. Disc brick, 221. Disc brick surface, 222. Disc brick male joint, 223. Pressure inclined surface, 224. Disc brick adhesive joint, 225. Disc brick mortar joint, 23. Bowl brick, 231. Bowl brick adhesive joint, 232. Bowl brick mortar joint, 30. Base, 301. Deformed sliding plate cavity, 50. Brick matching pressure plate, 501. Waist-shaped through hole, 502. Pressing inclined surface, 503. Lifting hole, 51. Lifting hook, 511. 512. L-shaped lifting head; 52. Unblocking cone; 52. Original brick; 521. Pressure-bearing slope; 522. Elevating platform; 523. Steel hoop; 524. Brick mortar joint; 525. Cylindrical body; 55. Steel outlet assembly; 551. Steel outlet body; 552. Elevating groove; 56. Easy-to-match brick; 561. Easy-to-identify; 562. Docking platform; 563. Pre-installed fire mortar; 564. Brick mortar joint; 60. Buffer base; 601. Brick mortar passage; 602. Pressure plate release chamber; 603. Bolt extension pool; 604. Inner sliding plate cavity; 61. Inner sliding plate; 611. Inner sliding plate fire mortar; 62. Outer sliding plate; 63. Outer water outlet; 64. Opening and closing frame; 65. Sliding frame; 66. Outer water outlet seat; 67. Tightener; 68. Mechanism guard plate, 69. Surface pressure spring, 70. Surface pressure bolt, A--thickness of waist hole groove plate, B--thickness of brick matching pressure plate, S--thickness of water outlet, M--height of original matching brick, N--height of easy matching brick. Detailed Implementation

[0042] Example 1, see appendix to the instruction manual. Figure 1-11A converter slag-blocking device for improving the installation accuracy of brick distribution and the stability of the mechanism's surface pressure includes a connecting plate, a reference plate, a slag-blocking mechanism, brick distribution, and a tapping spout body. The connecting plate is connected to the reference plate. The slag-blocking mechanism is installed on the outside of the connecting plate and the brick distribution. The slag-blocking mechanism includes a buffer base, an inner sliding plate, an opening and closing frame, a sliding frame, an outer sliding plate, an outer water inlet, an outer water inlet seat, a clamping device, and a mechanism guard plate. A water-cooled oil cylinder drive device is installed on the upper part of the connecting plate. The tapping spout body is installed in the central hole of the reference plate, and brick distribution is installed in the central hole of the connecting plate. The brick distribution is concentric with and connected to the tapping spout body. Pressure plate grooves are provided on both sides of the central hole of the connecting plate. Brick distribution pressure plates are installed in the pressure plate grooves. The two brick distribution pressure plates are fixed in the pressure plate grooves with pressure plate bolts and pressed against both sides of the brick distribution. The buffer base is installed on the connecting plate and the brick distribution. On the outside of the brick, a sliding frame and an opening / closing frame are sequentially arranged on the outside of the buffer base. On the outside of the sliding frame, an outer water inlet seat, a mechanism guard plate, and a clamping device are sequentially arranged. The buffer base and the opening / closing frame are connected together with face-pressure bolts. The sliding frame is installed inside the opening / closing frame. Spring chambers and fixed slide rails are respectively arranged on both sides of the opening / closing frame. Face-pressure springs are installed in the spring chambers. Movable slide rails corresponding to the fixed slide rails are arranged on both sides of the sliding frame. The inner slide plate is installed in the inner slide plate brick cavity of the buffer base, and the outer slide plate is installed in the brick cavity of the sliding frame. The outer water inlet is fixed to the outside of the outer slide plate with a clamping device. The buffer base has a brick-feeding passage corresponding to the brick-feeding position. On both sides of the brick-feeding passage are pressure plate release chambers corresponding to the positions of the two brick-feeding pressure plates. The buffer base has a bolt extension pool corresponding to the position of the pressure plate bolts.

[0043] The brick-laying device comprises an integrally formed cylinder and a raised platform. A central through-hole is located in the center of the brick-laying device. Two symmetrically arranged pressure-bearing inclined surfaces are positioned on the left and right sides of the cylinder. A steel hoop is fitted onto the outer surface of the cylinder to enhance the safety of the brick-laying device. The raised platform is frustum-shaped, and the steel outlet body has a raised groove matching the dimensions of the raised platform, facilitating the removal and installation of the brick-laying device on-site. The top of the cylinder is configured as a docking platform, either a female or male connector. The preferred docking platform design increases the height of the central hole and the path length of the molten steel flowing through the brick-laying device, thus improving its service life. Correspondingly, the connection method between the brick-laying device and the inner sliding plate is configured as a flat-mouth connection, a male-female connection, or a female-male connection. The preferred flat-mouth connection method increases the connection area and safety between the brick-laying device and the inner sliding plate.

[0044] Two specifications of bricks are provided: original bricks and easy-to-use bricks. The height of the original brick is M, and the height of the easy-to-use brick is N, where M > N. The difference between M and N is generally 2-5mm. The original bricks and easy-to-use bricks are identical in all dimensions except for the height. The original bricks are used in the tapping assembly and are bonded to the tapping body with high-temperature adhesive. The thickness of the adhesive joint between the original bricks and the tapping body is 0.1-0.4mm. The easy-to-use bricks are used for replacement on the production site and are connected to the tapping body with high-temperature mortar. The thickness of the mortar joint between the easy-to-use bricks and the tapping body is generally 2-5mm. Compared with the thickness of the mortar joint between the easy-to-use bricks and the tapping body, the thickness of the adhesive joint between the original bricks and the tapping body is very small and can be ignored.

[0045] The brick-filling recess is located on the back of the buffer base and is concentric with the center hole of the water inlet of the buffer base. The diameter of the brick-filling recess is larger than the outer diameter of the brick-filling cylinder, and the depth of the brick-filling recess is 3-5mm greater than the thickness of the brick-filling mortar joint.

[0046] The brick-laying pressure plate is designed as a flat plate with a waist-shaped through hole in the middle. The thickness of the brick-laying pressure plate is about 2 to 5 mm less than the depth of the pressure plate groove. One side of the brick-laying pressure plate is provided with a stepped lifting hole and a pressing slope. The pressing slope is matched with the size of the pressure slope of the brick-laying plate.

[0047] The stepped lifting hole of the brick pressing plate is equipped with a lifting hook. One end of the lifting hook is an L-shaped lifting head, the other end is a clearing cone head, and the middle is cylindrical or square, preferably cylindrical. The size of the L-shaped lifting head is adapted to the size of the stepped lifting hole of the brick pressing plate.

[0048] The pressure plate release chambers are located on both sides of the central hole of the water inlet of the buffer base and are arranged symmetrically. Their width is greater than the width of the pressure plate groove of the connecting plate. The total length of the pressure plate release chambers on both sides is greater than the total length of the pressure plate grooves on both sides of the connecting plate. The depth of the pressure plate release chambers is not less than the thickness of the brick mortar joint.

[0049] The bolt extension pools are located on both sides of the central hole of the buffer base water inlet and are arranged symmetrically. The diameter of the bolt extension pool is larger than the diameter of the pressure plate bolt head, and the depth of the bolt extension pool is greater than or equal to the thickness of the pressure plate bolt head.

[0050] The usage process and principle of this invention are as follows:

[0051] Step 1: Connect the base plate to the outlet flange, and connect the connecting plate to the base plate. Install the outlet seat brick on one side of the base plate, ensuring its center hole is concentric with the center hole of the base plate. When replacing the outlet assembly, use a special outlet tool to fix the outlet assembly in the pressure plate groove of the connecting plate, making the surface of the brick flush with the surface of the connecting plate. Then, fill the gap between the outlet assembly and the outlet seat brick with outlet filler. After they are fixed together, remove the special outlet tool, place the brick pressure plate into the pressure plate groove of the connecting plate, tighten the pressure plate bolts with a pneumatic tool, and press the brick pressure plate firmly. Fix the outlet assembly in the center hole of the connecting plate, completing the replacement of the outlet assembly. In the outlet assembly, the original brick is bonded to the outlet body with high-temperature adhesive, and the thickness of the adhesive joint is almost zero, which improves the assembly strength of the outlet assembly and effectively extends the service life of the original brick.

[0052] Step two involves online replacement of the slag-blocking mechanism. Place the slag-blocking mechanism above the locating pin on the connecting plate and push it forcefully towards the connecting plate. The instant the slag-blocking mechanism contacts the connecting plate, the inner sliding plate automatically aligns with the taphole bricks. The molten metal applied to the male opening of the inner sliding plate is squeezed outwards by the inertial force of the slag-blocking mechanism and forced into the surface of the bricks, the brick passageway of the mechanism base, and the center of the nozzle. Subsequently, as the four hinge nuts are tightened with a pneumatic tool to fix the slag-blocking mechanism to the connecting plate, the molten metal is further squeezed, with excess molten metal being further squeezed into the brick passageway and the central aperture. The mechanism base gradually approaches the connecting plate until the pneumatic tool can no longer penetrate it. At this point, the portion of the pressure plate bolt protruding above the connecting plate is fully inserted into the bolt extension pool without interfering with the buffer base. Then, the slag-blocking mechanism is connected to the hydraulic cylinder drive device to complete the online replacement of the slag-blocking mechanism. After the slag-blocking mechanism is replaced, with the original brick of the steel outlet assembly basically flush with the surface of the connecting plate, the excess molten mortar applied to the inner sliding plate is compressed and squeezed into the brick passage and the middle hole, so that the buffer base and the brick always maintain a flexible molten mortar connection, preventing the bending deformation of the sliding plate cavity in the buffer base, increasing the service life of the buffer base and the sliding plate, and improving the surface pressure stability and safety of the slag-blocking mechanism.

[0053] Step 3: After the slag-blocking mechanism is used, perform offline maintenance. After the mechanism cools down and is depressurized, dismantle, clean, replace, pressurize, and install the drain outlet of the inner and outer sliding plates. Then, clean all parts of the buffer base, such as the brick-filled passage, pressure plate release chamber, and bolt extension pool, to complete the offline maintenance of the slag-blocking mechanism in preparation for online replacement.

[0054] Step 4: After the steel tapping outlet has been used for a period of time, the brick distribution and slag blocking mechanisms must be replaced simultaneously. (1) Replace the brick distribution. After removing the slag blocking mechanism, use a tool to pry and remove the used bricks from the connecting plate slot and clean them. Use a lifting hook to clear the lifting hole of the brick distribution pressure plate. Apply fire mud to the brick distribution platform and place it on the steel tapping outlet body in the center hole of the connecting plate. Quickly insert the lifting hook into the lifting hole of the brick distribution pressure plate, quickly lift the brick distribution pressure plate and place it on the pressure slope of the brick distribution and press it against the bricks. Take out the lifting hook from the lifting hole and tighten the pressure plate bolt with a pneumatic tool so that the brick distribution pressure plate is pressed against the pressure slope of the brick distribution and the brick distribution is installed. On the steel outlet body, the individual replacement of the easy-to-place bricks is completed. The difference between the original brick height M and the easy-to-place brick height N is set to be 2-5mm, and the thickness of the mortar joint between the installed easy-to-place brick and the steel outlet body is basically the same. At the same time, the flat plate structure of the brick-placing pressure plate increases the force of the brick-placing pressure plate to press the brick. The use of the brick-placing lifting hole and the lifting hook shortens the brick replacement time. The above measures ensure that after the easy-to-place brick is replaced, it is basically level with or slightly higher than the connecting plate by 0-2mm, which greatly improves the accuracy of brick installation and creates favorable conditions for the subsequent replacement of the slag-blocking mechanism and the improvement of the stability and safety of the mechanism's surface pressure. (2) Replace the slag-blocking mechanism using the same method as in step two. After the brick-laying and slag-blocking mechanism are replaced, with the brick-laying plate basically level with or slightly higher than the connecting plate by 0-2mm, the excess mortar between the inner sliding plate and the brick-laying plate is squeezed into the middle aperture and the brick-laying passage. The portion of the brick-laying plate that protrudes above the surface of the connecting plate enters the brick-laying passage, ensuring that there is flexible mortar contact between the brick-laying plates and the brick-laying passage. This eliminates direct contact between the brick-laying plate and the plate release chamber, significantly reducing the impact of brick-laying and slag-blocking mechanism installation. The excessively high installation of the brick-pressing plate and the outward pushing force of the mortar squeezed into the back of the buffer base and between the bricks have solved the problems of bending and deformation of the inner sliding plate cavity caused by excessive brick installation, cracking and breakage of the inner sliding plate surface caused by bending and deformation of the inner sliding plate cavity, steel clamping between the inner and outer sliding plates, and excessive fluctuation of the mechanism surface pressure. This has improved the stability of the slag-blocking mechanism surface pressure and the service life of the sliding plate. At the same time, the significant reduction in the outward pushing force of the buffer base makes the connection between the buffer base and the connecting plate more solid and the contact tighter.

Claims

1. A converter slag-blocking device for improving the installation accuracy of brick distribution and the stability of the surface pressure of the mechanism, comprising a connecting plate, a reference plate, a slag-blocking mechanism, a brick distribution unit, and a tapping port body, wherein the connecting plate is connected to the reference plate, the slag-blocking mechanism is installed on the outside of the connecting plate and the brick distribution unit, and the slag-blocking mechanism includes a buffer base, an inner sliding plate, an opening and closing frame, a sliding frame, an outer sliding plate, an outer water inlet, an outer water inlet seat, a clamping device, and a mechanism guard plate, characterized in that: A water-cooled hydraulic cylinder drive device is installed on the upper part of the connecting plate. A steel outlet body is installed in the central hole of the reference plate, and a brick is installed in the central hole of the connecting plate. The brick is concentric with and connected to the steel outlet body. Pressure plate grooves are provided on both sides of the central hole of the connecting plate, and brick pressure plates are installed in the pressure plate grooves. The two brick pressure plates are fixed in the pressure plate grooves with pressure plate bolts and pressed against both sides of the brick. The buffer base is located outside the connecting plate and the brick. A sliding frame and an opening / closing frame are sequentially installed outside the buffer base. An outer water inlet seat, a mechanism guard plate, and a clamping device are sequentially installed outside the sliding frame. The buffer base and the opening / closing frame are connected by face-pressing bolts. The components are connected together. The sliding frame is installed inside the opening and closing frame. Spring chambers and fixed slide rails are respectively provided on both sides of the opening and closing frame. Surface pressure springs are provided in the spring chambers. Movable slide rails corresponding to the fixed slide rails are provided on both sides of the sliding frame. The inner slide plate is installed in the inner slide plate brick cavity of the buffer base. The outer slide plate is installed in the brick cavity of the sliding frame. The outer water outlet is fixed to the outside of the outer slide plate with a clamping device. The buffer base is provided with a brick-feeding passage corresponding to the brick-feeding position. On both sides of the brick-feeding passage are pressure plate release chambers corresponding to the positions of the two brick-feeding pressure plates. The buffer base is provided with a bolt extension pool corresponding to the position of the pressure plate bolts. The brick-laying device includes a cylinder and a raised platform. The brick-laying device has a through central hole in the middle. Two pressure-bearing inclined surfaces are symmetrically arranged on the left and right sides of the cylinder. A steel hoop is fitted on the outer side of the cylinder. The raised platform is frustum-shaped. The steel outlet body has a raised groove that matches the size of the raised platform. The top of the cylinder is set as a docking platform, a female or male opening. The connection between the brick-laying device and the inner sliding plate is set as a flat connection, a male-female connection, or a female-female connection.

2. The converter slag-blocking device for improving brick-mixing installation accuracy and structural surface pressure stability according to claim 1, characterized in that: The bricks are provided in two specifications: original bricks and easy-to-use bricks. The height of the original bricks is M, and the height of the easy-to-use bricks is N, where M > N, and the difference between M and N is 2-5mm. The original bricks and easy-to-use bricks are identical in all dimensions except for the height. The original bricks are used in the steel outlet assembly and are bonded to the steel outlet body with high-temperature adhesive. The thickness of the adhesive joint between the original bricks and the steel outlet body is 0.1-0.4mm. The easy-to-use bricks are used for replacement on the production site and are connected to the steel outlet body with high-temperature mortar. The thickness of the mortar joint between the easy-to-use bricks and the steel outlet body is 2-5mm.

3. The converter slag-blocking device for improving brick installation accuracy and structural surface pressure stability according to claim 1, characterized in that: The brick-filling passage is located on the back of the buffer base and is concentric with the center hole of the water inlet of the buffer base. The diameter of the brick-filling passage is larger than the outer diameter of the brick-filling cylinder, and the depth of the brick-filling passage is 3-5mm greater than the thickness of the brick-filling mortar joint.

4. The converter slag-blocking device for improving brick installation accuracy and structural surface pressure stability according to claim 1, characterized in that: The brick-feeding pressure plate is configured as a flat plate structure with a waist-shaped through hole in the middle. The thickness of the brick-feeding pressure plate is 2-5mm less than the depth of the pressure plate groove. A stepped lifting hole and a pressing slope are provided on one side of the brick-feeding pressure plate. The pressing slope is matched with the size of the pressure slope of the brick-feeding plate.

5. A converter slag-blocking device for improving brick-mixing installation accuracy and structural surface pressure stability according to claim 4, characterized in that: The stepped lifting hole of the brick-feeding pressure plate is equipped with a lifting hook. One end of the lifting hook is an L-shaped lifting head, the other end is a clearing cone head, and the middle is cylindrical or square. The size of the L-shaped lifting head is adapted to the size of the stepped lifting hole of the brick-feeding pressure plate.

6. The converter slag-blocking device for improving brick-mixing installation accuracy and structural surface pressure stability according to claim 1, characterized in that: The pressure plate release chamber is located on both sides of the central hole of the water inlet of the buffer base and is arranged symmetrically. Its width is greater than the width of the pressure plate groove of the connecting plate. The total length of the pressure plate release chamber on both sides is greater than the total length of the pressure plate groove on both sides of the connecting plate. The depth of the pressure plate release chamber is not less than the thickness of the brick mortar joint.

7. A converter slag-blocking device for improving brick-mixing installation accuracy and structural surface pressure stability according to claim 1, characterized in that: The bolt extension pools are located on both sides of the central hole of the buffer base water inlet and are arranged symmetrically. The diameter of the bolt extension pools is larger than the diameter of the pressure plate bolt head, and the depth of the bolt extension pools is greater than or equal to the thickness of the pressure plate bolt head.

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