Iron gate and method of operation

Abstract

The application discloses a molten iron gate and a working method, and belongs to the technical field of molten iron flow adjusting devices. The molten iron gate comprises a base, the lower end of the base is connected with an upper refractory plate, the lower end of the upper refractory plate is provided with a lower refractory plate, the lower end of the lower refractory plate is connected with a movable plate, and the upper refractory plate and the lower refractory plate are tightly attached. The base, the upper refractory plate, the lower refractory plate and the movable plate are all provided with through holes which are connected with a molten iron hole. The lower end of the movable plate is connected with a flow guide cylinder, one end of the movable plate is threadedly connected with a trapezoidal lead screw, and one end of the trapezoidal lead screw is connected with a driving assembly. The base comprises a base body, symmetrical guide pressure wheel mounting seats are arranged on the base body, guide pressure wheels are mounted on the guide pressure wheel mounting seats, and the guide pressure wheels are located at the two ends of the movable plate and press the movable plate tightly. The molten iron gate can adjust the molten iron flow, guarantee the stability and reliability of the flow adjusting process, does not need to stop the furnace, reduces the coke and artificial consumption, avoids the high-temperature spatter risk, stabilizes the working condition in the furnace and guarantees continuous production.

Description

Technical Field

[0001] This invention belongs to the technical field of molten iron flow regulation devices, specifically relating to a molten iron gate and its working method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] A cupola furnace is a vertical cylindrical melting device used in rock wool production. High temperatures generated by coke combustion melt raw materials such as basalt and dolomite into a molten state. The coke itself, along with substances like carbon monoxide produced from incomplete combustion, has reducing properties. These reducing substances, together with the high temperatures generated by coke combustion, create a reducing atmosphere inside the cupola furnace. A certain amount of iron oxides inevitably exists in the raw materials. When the raw materials are melted in the cupola furnace, they are reduced to elemental iron by the reducing atmosphere. This elemental iron exists in liquid form at the high temperatures inside the furnace and is called molten iron. Because molten iron has a higher specific gravity than the molten metal, it gradually accumulates and deposits at the bottom of the cupola furnace during the continuous melting process. If this molten iron is not drained in time and mixes into the molten metal, the resulting rock wool fibers will contain metallic iron impurities. This not only causes the product to turn black but also severely degrades its chemical stability, corrosion resistance, and fiber properties, ultimately resulting in the product failing to meet core performance standards such as heat insulation and sound absorption, rendering it scrap.

[0004] A cupola furnace has two outlets: one on the side of the furnace, called the siphon, used for discharging molten rock wool. The other is located at the bottom of the furnace and is periodically opened as needed to discharge molten iron from the bottom. The ordinary taphole of a cupola furnace is often sealed with refractory mud. Opening it requires blowing through an oxygen pipe to burn through the refractory mud and allow the molten iron to flow out. Closing it requires a piece of refractory mud of a specific shape and strength to be prepared beforehand for rapid sealing. Because the taphole is sealed with yellow mud, the size of the taphole area cannot be precisely controlled, causing temporary instability in furnace parameters (temperature, pressure, etc.) and affecting the flow rate of the molten iron at the siphon. Furthermore, to prevent excessively fast molten iron flow from splashing and endangering personnel, the combustion air volume of the cupola furnace needs to be reduced, further affecting the normal parameters inside the furnace and necessitating a production halt.

[0005] Therefore, if the molten iron discharge of the cupola furnace used for rock wool production relies on the traditional tapping structure, the following drawbacks exist: 1. Traditional equipment cannot continuously adjust the flow rate, and a single discharge will cause a sudden drop in hearth pressure and damage to the stability of the bottom coke, requiring furnace shutdown and severely impacting output; 2. Before discharging molten iron, feeding must be stopped and blast gradually stopped (to avoid accidents caused by a sudden drop in furnace pressure). After discharge, the furnace must be reheated, the bottom coke height adjusted, and the blast and feeding systems restarted. A single shutdown can take 30-60 minutes, directly causing an interruption in the supply of rock wool raw materials and affecting the continuity of downstream production lines; 3. Restarting the furnace requires additional coke for recovery, and the shutdown process requires manual intervention by designated personnel. The temperature fluctuations during this period make the refractory material inside the furnace prone to cracking due to thermal shock; and while there is no product output during the shutdown period, other costs such as equipment operation and personnel costs continue to be consumed, directly increasing the overall production cost of rock wool; 4. Manual operation requires close contact with high-temperature molten iron, which can easily cause splashing accidents, and the reliability of mud plug sealing is poor, posing a risk of leakage. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a molten iron gate and its operating method, which can regulate the flow rate of molten iron, ensure a stable and reliable flow rate regulation process, eliminate the need to shut down the furnace, reduce coke and labor losses, avoid the risk of high-temperature splashing, stabilize furnace conditions, and ensure continuous production.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A molten iron gate includes a base, the lower end of which is connected to an upper refractory plate. A lower refractory plate is disposed at the lower end of the upper refractory plate, and the lower end of the lower refractory plate is connected to a movable plate. The upper and lower refractory plates are in close contact. The base, upper refractory plate, lower refractory plate, and movable plate are all provided with through holes communicating with the molten iron nozzle. The lower end of the movable plate is connected to a guide cylinder, one end of the movable plate is threadedly connected to a trapezoidal lead screw, and one end of the trapezoidal lead screw is connected to a drive assembly. The base includes a base body, on which guide roller mounting seats are symmetrically arranged. Guide rollers are mounted on the guide roller mounting seats, and the guide rollers are located at both ends of the movable plate and press the movable plate tightly.

[0008] As a further technical solution, a first limiting frame is provided on the base body, the pressure guide wheel mounting seat is located on both sides of the first limiting frame, and a fire-resistant plate is installed on the first limiting frame; a first through hole is provided on the inner side of the first limiting frame.

[0009] As a further technical solution, the upper refractory plate includes an upper refractory plate body, on which a second through hole is provided. The second through hole is aligned with the first through hole of the base. Several circular holes are spaced apart around the second through hole, and the circular holes are filled with graphite.

[0010] As a further technical solution, the lower refractory plate includes a lower refractory plate body, and a third through hole is provided on the lower refractory plate body.

[0011] As a further technical solution, the movable plate includes a movable plate body, a second limiting frame is provided on the movable plate body, a lower fire-resistant plate is installed on the second limiting frame, a fourth through hole is provided on the inner side of the second limiting frame, and the fourth through hole is aligned with the third through hole of the lower fire-resistant plate.

[0012] As a further technical solution, a movable plate base is provided at the lower end of the movable plate body, the movable plate base is connected to the movable plate body, and a trapezoidal threaded hole is provided on the movable plate base, the trapezoidal threaded hole and the trapezoidal lead screw forming a threaded pair.

[0013] As a further technical solution, the guide tube includes an outer cylinder, a flange, and an inner cylinder. The upper end of the outer cylinder is fitted with a flange, and the flange is connected to the movable plate by bolts. The inner cylinder is provided inside the outer cylinder, and the cavity of the inner cylinder communicates with the fourth through hole of the movable plate.

[0014] As a further technical solution, the guide roller includes a screw, a disc spring is sleeved on the upper end of the screw, a bearing is sleeved in the middle of the screw, a support ring is sleeved on the outside of the bearing, a wheel body is sleeved on the outside of the support ring, and a groove is provided on the wheel body, which engages with the movable plate.

[0015] As a further technical solution, the drive assembly includes a thrust bearing assembly, a geared motor, and a coupling. The output end of the geared motor is connected to one end of the coupling, and the other end of the coupling is connected to a trapezoidal lead screw. A thrust bearing assembly is provided at one end of the coupling, and the thrust bearing assembly is connected to the trapezoidal lead screw. The upper ends of both the trapezoidal lead screw and the geared motor are connected to the base.

[0016] The working method of the molten iron gate includes the following steps: Connect the base to the tap hole of the cupola furnace, ensuring that the through holes of the base, upper refractory plate, lower refractory plate, and movable plate are interconnected to form a molten iron channel; the guide roller mounting seats on both sides of the base body are equipped with guide rollers, and the guide rollers press the movable plate to keep the upper and lower refractory plates in close contact. The start-up drive assembly drives the trapezoidal lead screw to rotate. The lead screw and the movable plate form a threaded engagement, converting the rotational motion into linear displacement of the movable plate. The movable plate drives the lower refractory plate to move together, changing the overlapping area of ​​the through holes of the upper and lower refractory plates, adjusting the flow rate of molten iron. The molten iron flows into the guide tube through the through holes and is discharged outward.

[0017] Compared with the prior art, the advantages and positive effects of this invention are: This invention drives the trapezoidal screw to rotate via a drive component, which in turn drives the movable plate to slide smoothly in a straight line. This changes the flow area of ​​the overlapping through holes in the upper and lower refractory plates, allowing for precise adjustment of the molten iron flow rate. The entire process does not require furnace shutdown, stabilizing the pressure and temperature inside the furnace and maintaining uninterrupted operation of the production line.

[0018] The guide roller of the present invention can limit and constrain the sliding trajectory of the movable plate, and at the same time continuously apply a stable clamping force to the movable plate, so that the upper refractory plate and the lower refractory plate are tightly fitted and sealed, preventing molten iron from leaking from the gap between the two plates. It can continuously output constant pressure, offset the gap caused by component deformation under high temperature conditions, maintain the sealing effect for a long time, and ensure the stability and reliability of the flow regulation process.

[0019] This invention uses a drive component to adjust the flow rate, eliminating the need for manual close-range operation and refractory mud to open and close the molten iron nozzle. It can remotely control the opening of the gate valve, avoiding the risk of burns from direct exposure to high-temperature molten iron. At the same time, the flow rate adjustment is continuous and stable, without disturbing the furnace conditions. It eliminates the cumbersome process of manual furnace shutdown, reduces labor costs, and ensures the continuous and stable operation of the production line. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the open state of the molten iron gate of the present invention; Figure 2 This is a schematic diagram of the closed state of the molten iron gate of the present invention; Figure 3 This is a schematic diagram of the installation position of the guide roller of the present invention; Figure 4 This is a schematic diagram of the base structure of the present invention; Figure 5 This is a schematic diagram of the structure of the upper fire-resistant plate of the present invention; Figure 6 This is a schematic diagram of the structure of the lower fire-resistant plate of the present invention; Figure 7 This is a schematic diagram of the structure of the movable plate of the present invention; Figure 8 This is a schematic diagram of the structure of the guide tube of the present invention; Figure 9 This is a schematic diagram of the structure of the pressure guide wheel of the present invention; In the diagram: 1. Base; 11. Base body; 12. First limiting frame; 13. Guide roller mounting seat; 14. First through hole; 2. Upper refractory board; 21. Upper refractory board body; 22. Round hole; 23. Second through hole; 3. Lower refractory board; 31. Lower refractory board body; 32. Third through hole; 4. Movable plate; 41. Movable plate body; 42. Second limiting frame; 43. Movable plate base; 44. Trapezoidal threaded hole; 45. Fourth through hole; 5. Flow guide tube; 51. Outer cylinder; 52. Flange; 53. Inner cylinder; 6. Guide roller; 61. Screw; 62. Wheel body; 63. Bearing; 64. Disc spring; 65. Support ring; 66. Groove; 7. Trapezoidal lead screw; 8. Gear motor; 9. Coupling; 10. Thrust bearing assembly; 101. Mounting bracket; 102. Bearing mounting. Detailed Implementation

[0022] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a molten iron gate, such as... Figure 1 and Figure 2 As shown, the system includes a base 1, the lower end of which is connected to an upper refractory plate 2. A lower refractory plate 3 is disposed at the lower end of the upper refractory plate 2, and the lower end of the lower refractory plate 3 is connected to a movable plate 4. The upper refractory plate 2 and the lower refractory plate 3 are in close contact. The base 1, the upper refractory plate 2, the lower refractory plate 3, and the movable plate 4 are all provided with through holes that communicate with the iron tapping nozzle. The lower end of the movable plate 4 is connected to a guide cylinder 5, one end of the movable plate 4 is threadedly connected to a trapezoidal lead screw 7, and one end of the trapezoidal lead screw 7 is connected to a drive assembly.

[0025] like Figure 3 As shown, the base 1 includes a base body 11, on which pressure roller mounting seats 13 are symmetrically arranged, and pressure rollers 6 are installed on the pressure roller mounting seats 13. The pressure rollers 6 are located at both ends of the movable plate 4 and press the movable plate 4 tightly.

[0026] Specifically, by driving the trapezoidal screw 7 to rotate through the drive component, the movable plate 4 can be moved smoothly in a straight line, changing the flow area of ​​the overlapping through holes of the upper refractory plate 2 and the lower refractory plate 3. This allows for precise adjustment of the molten iron flow rate, eliminating the need to stop the furnace throughout the process, stabilizing the pressure and temperature inside the furnace, and maintaining uninterrupted operation of the production line.

[0027] The guide roller 6 can limit and constrain the sliding trajectory of the movable plate 4, and at the same time continuously apply a stable clamping force to the movable plate 4, so that the upper refractory plate 2 and the lower refractory plate 3 are tightly fitted and sealed, preventing molten iron from leaking from the gap between the two plates. It can continuously output constant pressure, offset the gap caused by component deformation under high temperature conditions, maintain the sealing effect for a long time, and ensure the stability and reliability of the flow regulation process.

[0028] Driven by the drive components, the molten iron can be opened and closed without the need for close-range manual operation or the burning of refractory mud. The opening of the gate valve can be remotely controlled, avoiding the risk of burns from hot molten iron splashing directly on the person. At the same time, the flow rate adjustment is continuous and stable, without disturbing the furnace conditions. This eliminates the cumbersome process of manual furnace shutdown, reduces labor costs, and ensures the continuous and stable operation of the production line.

[0029] like Figure 4 As shown, a first limiting frame 12 is provided on the base body 11, and the guide roller mounting seat 13 is located on both sides of the first limiting frame 12. A fire-resistant plate 2 is installed on the first limiting frame 12; a first through hole 14 is provided on the inner side of the first limiting frame 12.

[0030] Specifically, the base body 11 has pre-reserved guide roller mounting seats 13 on both sides, and the upper refractory plate 2 is integrally embedded inside the first limiting frame 12. The first limiting frame 12 restricts the displacement of the upper refractory plate 2 and always fixes the reference position of the upper refractory plate 2. The guide roller mounting seats 13 on both sides provide fixed mounting points for the guide rollers 6, so that the guide rollers 6 can stably press against the movable plate 4. The first through hole 14 of the base 1 is aligned with the flow hole of the upper refractory plate 2 to form a continuous channel for molten iron to flow in, and the positioning effect of the first limiting frame 12 avoids the problem of misalignment and blockage of the through hole after long-term use.

[0031] like Figure 5 As shown, the upper refractory plate 2 includes an upper refractory plate body 21. A second through hole 23 is provided on the upper refractory plate body 21. The second through hole 23 is aligned with the first through hole 14 of the base 1. Several round holes 22 are provided at intervals around the second through hole 23. The round holes 22 are filled with graphite.

[0032] Specifically, a second through hole 23 is opened in the center of the upper refractory plate body 21. After assembly, the second through hole 23 is completely aligned with the first through hole 14 of the base 1, serving as a channel for molten iron to enter the gate valve.

[0033] When the movable plate 4 drives the lower refractory plate 3 to slide and adjust the flow, the surfaces of the upper refractory plate 2 and the lower refractory plate 3 continuously rub against each other. The graphite-filled round holes 22 can form a uniform lubricating layer on the mating surface, reducing sliding friction resistance, reducing the load on the drive trapezoidal screw 7, and reducing wear on the refractory plate surface, thus preventing the formation of iron-seeping gaps after the plate surface wears down. This allows the refractory plate to slide repeatedly without jamming, which can not only accurately adjust the flow cross-sectional area, but also extend the service life of the refractory plate and improve the overall sealing and flow adjustment stability.

[0034] like Figure 6 As shown, the lower refractory plate 3 includes a lower refractory plate body 31, and a third through hole 32 is provided on the lower refractory plate body 31. The movable plate 4 includes a movable plate body 41, and a second limiting frame 42 is provided on the movable plate body 41. The lower refractory plate 3 is installed on the second limiting frame 42. A fourth through hole 45 is provided on the inner side of the second limiting frame 42, and the fourth through hole 45 is aligned with the third through hole 32 of the lower refractory plate 3.

[0035] Specifically, the lower refractory plate body 31 has a third through hole 32, the movable plate body 41 is provided with a second limiting frame 42, the lower refractory plate 3 is fixedly embedded in the second limiting frame 42, and a fourth through hole 45 is opened on the inner side of the second limiting frame 42. After assembly, the fourth through hole 45 is completely aligned and connected with the third through hole 32. The second limiting frame 42 constrains the lower refractory plate 3 to prevent the lower refractory plate 3 from shifting when sliding with the movable plate 4, and always keeps the third through hole 32 and the fourth through hole 45 coaxially connected, so that molten iron can be conveyed downward to the guide tube 5.

[0036] When the movable plate 4 moves horizontally as a whole, the second limiting frame 42 simultaneously drives the lower refractory plate 3 to move synchronously, changing the overlapping area of ​​the third through hole 32 and the second through hole 23 of the upper refractory plate 2, thereby adjusting the flow rate of molten iron. The second limiting frame 42 eliminates the gap between the refractory plate and the movable plate 4, avoiding flow rate adjustment deviation caused by misalignment of the holes. At the same time, in conjunction with the clamping force of the guide roller 6, it continuously maintains the tight fit between the upper refractory plate 2 and the lower refractory plate 3, effectively preventing molten iron from leaking from the gaps on the sides of the two plates.

[0037] like Figure 7 As shown, a movable plate base 43 is provided at the lower end of the movable plate body 41. The movable plate base 43 is connected to the movable plate body 41. A trapezoidal threaded hole 44 is provided on the movable plate base 43. The trapezoidal threaded hole 44 and the trapezoidal lead screw 7 form a threaded pair.

[0038] Specifically, a movable plate base 43 is fixedly connected to the lower part of the movable plate body 41. A trapezoidal threaded hole 44 is machined on the movable plate base 43. The trapezoidal threaded hole 44 meshes with the trapezoidal lead screw 7 to form a threaded transmission pair. When the geared motor 8 drives the trapezoidal lead screw 7 to rotate, the wide meshing surface of the trapezoidal thread can withstand the large resistance generated by the compression of the fireproof plate, smoothly converting the circumferential rotation of the trapezoidal lead screw 7 into a horizontal linear thrust of the movable plate base 43, driving the entire movable plate 4 and the lower fireproof plate 3 to slide laterally synchronously.

[0039] The trapezoidal thread has a self-locking capability. After the geared motor 8 stops running, the trapezoidal screw 7 will not reverse on its own under the pressure inside the furnace. The movable plate 4 can directly lock the current opening without the need for additional locking parts, thus stably maintaining the set molten iron flow rate. The drive stroke of the threaded pair is controllable, allowing for fine adjustment of the moving distance of the movable plate 4, achieving stepless continuous adjustment of the molten iron flow rate and ensuring precise control of the iron output.

[0040] like Figure 8 As shown, the guide tube 5 includes an outer tube 51, a flange 52, and an inner tube 53. The upper end of the outer tube 51 is fitted with the flange 52, which is connected to the movable plate 4 by bolts. The inner tube 53 is provided inside the outer tube 51, and the cavity of the inner tube 53 is connected to the fourth through hole 45 of the movable plate 4.

[0041] Specifically, flange 52 is fitted onto the upper end of outer cylinder 51 and is detachably locked to the bottom surface of movable plate 4 by bolts. The hollow cavity of inner cylinder 53 is connected upwards to the fourth through hole 45 of movable plate 4. Molten iron flows out from the fourth through hole 45 of movable plate 4 and directly enters inner cylinder 53. Inner cylinder 53 constrains the direction of molten iron flow, regulates the liquid flow pattern, prevents high-temperature molten iron from splashing everywhere, and eliminates on-site safety hazards. Outer cylinder 51 wraps around inner cylinder 53, insulating the high-temperature molten iron from radiating heat outwards and protecting surrounding transmission components such as guide roller 6 and trapezoidal screw 7 from high-temperature baking and aging.

[0042] More specifically, the inner cylinder 53 is made of silicon carbide. After the molten iron flows out from the fourth through hole 45 of the movable plate 4, it directly enters the silicon carbide inner cylinder 53. The silicon carbide material is resistant to high temperature and erosion by molten iron. It can withstand high temperature liquid iron for a long time and is not easily melted or corroded. The tubular inner cylinder 53 can regulate and constrain the direction of the molten iron flow, gather and disperse the liquid flow, prevent high temperature molten iron from splashing everywhere, and eliminate the safety hazards of high temperature splashing on site.

[0043] The guide roller 6 includes a screw 61, a disc spring 64 is sleeved on the upper end of the screw 61, a bearing 63 is sleeved in the middle of the screw 61, a support ring 65 is sleeved on the outside of the bearing 63, a wheel body 62 is sleeved on the outside of the support ring 65, and a groove 66 is provided on the wheel body 62, which is engaged with the movable plate 4.

[0044] Specifically, the guide roller 6 uses an internal hexagonal head shoulder screw 61 as the main mounting load. A disc spring 64 is fitted on the upper end of the screw 61, and a deep groove ball bearing 63 is fitted in the middle shoulder section of the screw 61 with clearance fit. A support ring 65 is sleeved on the outside of the deep groove ball bearing 63, and a wheel body 62 is fitted on the outside of the support ring 65. The wheel body 62 is machined with a groove 66 that adapts to the side of the movable plate 4, and the wheel body 62 is engaged with the side of the movable plate 4 through the groove 66.

[0045] When the locking hexagonal head shoulder screw 61 is installed, the disc spring 64 is compressed and stores energy, continuously outputting stable axial pressure. The pressure is transmitted sequentially to the deep groove ball bearing 63, the support ring 65 and the wheel body 62. The wheel body 62 clamps the movable plate 4 with the slot 66, and applies pressure evenly to the movable plate 4, forcing the movable plate 4 to press against the upper refractory plate 2, so that the upper refractory plate 2 and the lower refractory plate 3 are tightly fitted to form a sealing surface, preventing molten iron from leaking from the gaps in the plate surface.

[0046] The deep groove ball bearing 63 can rotate synchronously with the sliding plate 4, converting the sliding friction between the sliding plate 4 and the wheel 62 into rolling friction, thus reducing the lateral movement resistance of the sliding plate 4. The disc spring 64 can adaptively compensate for the gaps caused by the thermal deformation of various parts under high temperature conditions, maintaining a constant clamping force over a long period of time. At the same time, the groove 66 of the wheel 62 engages with the sliding plate 4 to limit its movement, constraining the sliding plate 4 to slide only in a straight line in the horizontal direction, preventing it from shifting during the sliding process.

[0047] The groove 66 is a V-shaped groove. The V-shaped inclined surface can achieve automatic centering and guidance, and constrain the movable plate to prevent left and right displacement during sliding, thus ensuring accuracy. The clamping force is evenly distributed along the inclined surface to avoid local pressure deformation of the movable plate and to stably maintain the sealing and adhesion of the fire-resistant plate.

[0048] like Figure 9 As shown, the drive assembly includes a thrust bearing assembly 10, a geared motor 8, and a coupling 9. The output end of the geared motor 8 is connected to one end of the coupling 9, and the other end of the coupling 9 is connected to the trapezoidal lead screw 7. The thrust bearing assembly 10 is installed at one end of the coupling 9, and the thrust bearing assembly 10 is connected to the trapezoidal lead screw 7. The upper ends of both the trapezoidal lead screw 7 and the geared motor 8 are connected to the base 1.

[0049] Specifically, the output torque of the geared motor 8 is smoothly transmitted to the trapezoidal lead screw 7 through the coupling 9. The coupling 9 buffers the impact load during the start and stop of the geared motor 8, preventing damage to the threaded pair and the trapezoidal lead screw 7 due to impact. The thrust bearing assembly 10 is specifically designed to withstand the axial reverse thrust generated when the trapezoidal lead screw 7 is running, offsetting the clamping resistance from the movable plate 4 and the refractory plate, preventing axial movement of the trapezoidal lead screw 7, and ensuring the precise and stable meshing position of the trapezoidal thread. The trapezoidal lead screw 7 can be driven to rotate forward and backward by electrical control, automatically driving the movable plate 4 to slide and adjust the iron discharge opening, eliminating the need for manual close contact with the high-temperature iron discharge port throughout the entire process.

[0050] The thrust bearing assembly 10 includes a mounting bracket 101 and a mounting bearing 102. The mounting bearing 102 is fitted onto the outside of the trapezoidal lead screw 7. The top of the mounting bracket 101 is fixedly connected to the base 1. During operation, the mounting bearing 101 can bear the axial thrust generated by the operation of the trapezoidal lead screw 7, prevent the trapezoidal lead screw 7 from moving axially, and ensure that the mounting bearing 102 and the trapezoidal lead screw 7 are always coaxially matched to stably transmit the transmission torque.

[0051] Example 2 The working method of the molten iron gate in Example 1 includes the following steps: Connect the base 1 to the tap hole of the cupola furnace, ensuring that the through holes of the base 1, the upper refractory plate 2, the lower refractory plate 3, and the movable plate 4 are interconnected to form a molten iron channel; the guide pressure roller mounting seats 13 on both sides of the base body 11 are equipped with guide pressure rollers 6, and the guide pressure rollers 6 press the movable plate 4 to keep the upper refractory plate 2 and the lower refractory plate 3 in close contact. The start-up drive assembly drives the trapezoidal lead screw 7 to rotate. The trapezoidal lead screw 7 forms a threaded engagement with the movable plate 4, converting the rotational motion into linear displacement of the movable plate 4. The movable plate 4 drives the lower refractory plate 3 to move together, changing the overlapping area of ​​the through holes of the upper refractory plate 2 and the lower refractory plate 3, and adjusting the flow rate of molten iron. The molten iron flows into the guide cylinder 5 through the through hole and is discharged outward.

[0052] Specifically, after the equipment is assembled, the base 1 is fixed to the bottom taphole of the cupola furnace, and the guide tube 5 is arranged downwards to receive the molten iron. The guide rollers 6 on both sides of the base 1 press the movable plate 4, and the grooves 66 of the wheel body 62 engage with the movable plate 4 for limiting the position. The disc spring 64 continuously outputs constant pressure to ensure that the upper refractory plate 2 and the lower refractory plate 3 fit tightly together, preventing molten iron from leaking from the gaps in the plate surface.

[0053] When production is adjusted, the geared motor 8 is started. The output torque of the geared motor 8 is transmitted to the trapezoidal lead screw 7 through the coupling 9. The axial force generated by the operation of the trapezoidal lead screw 7 is offset by the thrust bearing assembly 10 to prevent the trapezoidal lead screw 7 from moving. The trapezoidal lead screw 7 meshes with the trapezoidal threaded hole 44 on the movable plate base 43 to form a threaded transmission pair, which converts the rotational motion of the trapezoidal lead screw 7 into the horizontal linear sliding motion of the movable plate 4.

[0054] The movable plate 4 synchronously drives the lower refractory plate 3 in the second limit frame 42 to move together, changing the overlapping cross-sectional area of ​​the third through hole 32 of the lower refractory plate 3 and the second through hole 23 of the upper refractory plate 2, thereby regulating the flow of molten iron. After passing through the through hole, the molten iron flows into the inner cylinder 53 of the guide cylinder 5. The inner cylinder 53 gathers the molten iron flow and avoids the splashing of high-temperature molten iron.

[0055] By controlling the forward and reverse rotation of the geared motor 8 and finely adjusting the tapping opening during the running time, the entire process can be completed without stopping the furnace or manually sealing and eroding the tapping nozzle at close range. After the geared motor 8 stops, the trapezoidal thread pair self-locks and automatically locks the position of the movable plate 4 to maintain a stable flow rate. When it is necessary to shut off the molten iron, the geared motor 8 is operated to slide the movable plate 4 until the through holes of the upper refractory plate 2 and the lower refractory plate 3 are completely misaligned, thus closing the tapping channel.

[0056] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A molten iron gate, characterized in that, The system includes a base, the lower end of which is connected to an upper refractory plate. A lower refractory plate is disposed at the lower end of the upper refractory plate, and the lower end of the lower refractory plate is connected to a movable plate. The upper and lower refractory plates are in close contact. The base, upper refractory plate, lower refractory plate, and movable plate are all provided with through holes that communicate with the iron tapping nozzle. The lower end of the movable plate is connected to a guide cylinder, one end of the movable plate is threadedly connected to a trapezoidal lead screw, and one end of the trapezoidal lead screw is connected to a drive assembly. The base includes a base body, on which guide roller mounting seats are symmetrically arranged. Guide rollers are mounted on the guide roller mounting seats, and the guide rollers are located at both ends of the movable plate and press the movable plate tightly.

2. The molten iron gate as described in claim 1, characterized in that, A first limiting frame is provided on the base body, and the pressure roller mounting seat is located on both sides of the first limiting frame. A fire-resistant plate is installed on the first limiting frame; a first through hole is provided on the inner side of the first limiting frame.

3. The molten iron gate as described in claim 1, characterized in that, The upper refractory plate includes an upper refractory plate body, on which a second through hole is provided. The second through hole is aligned with the first through hole of the base. Several circular holes are spaced apart around the second through hole, and the circular holes are filled with graphite.

4. The molten iron gate as described in claim 1, characterized in that, The lower refractory plate includes a lower refractory plate body, and a third through hole is provided on the lower refractory plate body.

5. The molten iron gate as described in claim 1, characterized in that, The movable plate includes a movable plate body, a second limiting frame is provided on the movable plate body, a lower fire-resistant plate is installed on the second limiting frame, a fourth through hole is provided on the inner side of the second limiting frame, and the fourth through hole is aligned with the third through hole of the lower fire-resistant plate.

6. The molten iron gate as described in claim 5, characterized in that, The lower end of the movable plate body is provided with a movable plate base, which is connected to the movable plate body. A trapezoidal threaded hole is provided on the movable plate base, and the trapezoidal threaded hole and the trapezoidal lead screw form a threaded pair.

7. The molten iron gate as described in claim 1, characterized in that, The guide tube includes an outer cylinder, a flange, and an inner cylinder. The upper end of the outer cylinder is fitted with a flange, which is connected to the movable plate by bolts. The inner cylinder is provided inside the outer cylinder, and the cavity of the inner cylinder communicates with the fourth through hole of the movable plate.

8. The molten iron gate as described in claim 1, characterized in that, The guide roller includes a screw, a disc spring is sleeved on the upper end of the screw, a bearing is sleeved in the middle of the screw, a support ring is sleeved on the outside of the bearing, a wheel body is sleeved on the outside of the support ring, and a groove is provided on the wheel body, which engages with the movable plate.

9. The molten iron gate as described in claim 1, characterized in that, The drive assembly includes a thrust bearing assembly, a geared motor, and a coupling. The output end of the geared motor is connected to one end of the coupling, and the other end of the coupling is connected to a trapezoidal lead screw. A thrust bearing assembly is installed at one end of the coupling and is connected to the trapezoidal lead screw. The upper ends of both the trapezoidal lead screw and the geared motor are connected to the base.

10. The method of operating the molten iron gate as described in any one of claims 1-9, characterized in that, Includes the following steps: Connect the base to the tap hole of the cupola furnace, ensuring that the through holes of the base, upper refractory plate, lower refractory plate, and movable plate are interconnected to form a molten iron channel; the guide roller mounting seats on both sides of the base body are equipped with guide rollers, and the guide rollers press the movable plate to keep the upper and lower refractory plates in close contact. The start-up drive assembly drives the trapezoidal lead screw to rotate. The lead screw and the movable plate form a threaded engagement, converting the rotational motion into linear displacement of the movable plate. The movable plate drives the lower refractory plate to move together, changing the overlapping area of ​​the through holes of the upper and lower refractory plates, adjusting the flow rate of molten iron. The molten iron flows into the guide tube through the through holes and is discharged outward.

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