Post-converter internal view of the mouth of the converter for slag overflow

Abstract

The present application relates to the field of converter steelmaking, in particular to a kind of furnace rear endoscopic furnace mouth overflow slag system for converter tapping.A kind of furnace rear endoscopic furnace mouth overflow slag system for converter tapping, including endoscopic device, rotating clamping arm and protective cover, it is characterized by: the endoscopic device includes converter (11), heat insulation wall (12), first endoscopic lens (141) and second endoscopic lens (142), the protective cover includes endoscope body (31), protective tube (32), installation bottom plate (33) and sealing plate (34), the protective cover includes endoscope body (31), protective tube (32), installation bottom plate (33) and sealing plate (34).The present application is convenient to install, it is convenient to detect, prolongs life.

Description

Technical Field

[0001] This invention relates to the field of converter steelmaking, specifically to a post-furnace end-view slag overflow system for converter tapping. Background Technology

[0002] The converter "doghouse" is an auxiliary device for the converter. Its function is to seal the converter body separately within the steelmaking workshop, preventing leakage and splashing of furnace fire, high temperature, dust, and molten steel. Currently, there are no pinhole corner cameras (cameras) installed on the rear fire baffle door or the doghouse to observe slag overflow at the furnace mouth and the internal conditions of the furnace. Correspondingly, there are no devices installed on the rear fire baffle door or the rear doghouse for rotating and clamping the pinhole corner cameras (cameras). This means that during tapping, the operators in the tapping control room cannot see the furnace mouth, which can easily lead to slag overflow burning the ladle car cables and equipment. Furthermore, large amounts of slag flowing into the ladle during the early stages of tapping can cause the entire ladle of molten steel to fail quality tests and be scrapped. At the same time, the high temperatures during converter operation create a harsh environment. Even if an endoscope is installed, its lifespan will be shortened due to the working environment, thus affecting the observation of the converter. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology and provide an auxiliary device for converters that is easy to install, easy to detect, and has a long service life, this invention discloses a furnace mouth slag overflow system for converter steel tapping.

[0004] The present invention achieves its objective through the following technical solution: A furnace mouth slag overflow system for converter tapping includes an endoscope, a rotating clamping arm, and a protective cover, characterized in that: The endoscopic device includes a converter, a heat insulation wall, a first endoscopic lens, and a second endoscopic lens. The heat insulation wall is located on the side of the converter opening, and the heat insulation wall is equipped with a liftable fire-blocking sliding door; A first opening and a second opening are arranged vertically from top to bottom on the insulation wall. A first endoscope is installed in the first opening and a second endoscope is installed in the second opening. The probe ends of both the first and second endoscopes face the furnace mouth side of the converter. The positions of the first opening and the second opening are determined as follows: When the converter rotates upward from the horizontal position until the upward direction of the converter's centerline and the vertical line forms an angle α, the central axis of the first opening is directly opposite the center point of the converter opening. When the converter rotates downward from a horizontal position until the center line of the converter and the upward direction of the vertical line form an angle β, the central axis of the second opening is directly opposite the upper half of the converter. The rotary clamping arm includes a protective cast iron plate, a vertical shaft, two rotary clamping units, and a pneumatic valve platform. The area separated by the protective cast iron plate is the doghouse where the converter is located. The protective cast iron plate has two observation holes from top to bottom. The vertical shaft is fixed to the protective cast iron plate. Each rotary clamping unit includes a connecting rod, a drive cylinder, a rotary arm, and an endoscope. The endoscope includes a first endoscope and a second endoscope. The inner end of the connecting rod is fixed on a vertical shaft. The cylinder body of the drive cylinder is parallel to the connecting rod and fixed on the connecting rod. The inner end of the rotary arm is rotatably located at the outer end of the connecting rod. The moving end of the piston rod of the drive cylinder is connected to the middle of the rotary arm. When the piston rod of the drive cylinder extends or retracts, it drives the rotary arm to rotate around the inner end. The endoscope is fixed at the outer end of the rotary arm. The position of each endoscope is directly opposite an observation hole on a protective cast iron plate. The pneumatic valve platform is connected to two drive cylinders via air supply pipes; The protective cover includes an endoscope body, a protective tube, a mounting base plate, and a sealing plate; A section of the outer wall of the lower half of the top of the end tube is cut off to form an arc-shaped wall with a central angle of no more than a semicircle, forming an endoscope window. The endoscope body is inserted into the inner cavity of the endoscope body, and the probe at the front end of the endoscope body faces the endoscope window. One side of the mounting base plate is provided with an endoscope fixing hole, the diameter of which is equal to the diameter of the endoscope. At least three positioning holes are provided around the endoscope fixing hole on the mounting base plate. The sealing plate is an arc-shaped plate, which is fixed to the top of the endoscope by fitting the arc side against the inner side of the top of the endoscope. The arc side of the sealing plate and the outer side of the endoscope window are joined together to form a circle. The bottom end of the endoscope is fixed to the endoscope fixing hole on the mounting base plate, and the inner cavity of the endoscope is flush with the wall of the endoscope fixing hole.

[0005] The furnace mouth slag overflow system for converter tapping is characterized in that: in the endoscopic device, both the first endoscopic lens and the second endoscopic lens are 120° pinhole corner endoscopic lenses. The rotating clamping arm includes an arm body, a rear lifting lug, a middle lifting lug, a bracket, and a diagonal brace. The rear end and the middle part of the arm body are respectively provided with a rear lifting lug and a middle lifting lug, and the rear lifting lug and the middle lifting lug are respectively located on both sides of the arm body. The bracket is fixed to the front end of the arm body, and the bracket and the arm body are connected by a diagonal brace. The endoscope is fixed on the bracket. In the aforementioned protective cover, the length of the endoscopic window is no more than 20% of the length of the protective tube.

[0006] The furnace mouth slag overflow system for converter tapping is characterized in that: in the endoscope device, α is 60°~65° and β is 100°~110°.

[0007] In the aforementioned rotating clamping arm, the endoscope is a pinhole corner lens.

[0008] When using this invention: In this embodiment, a first endoscope and a second endoscope are installed at the top and bottom positions of the fire-blocking sliding door and the doghouse, which are located as close as possible to the center line of the converter. The installation height of the endoscopes from the ground is calculated according to the different sizes of the converter and the doghouse. The overflow of slag from the converter mouth and the condition inside the furnace are observed during tapping. The second endoscope installed at a low position can also observe the slag discharge from the converter tapping mouth in a timely and clear manner. The observation start angle α of the first endoscope is 60° to 65°, and the observation end angle β of the second endoscope is 100° to 110°. The observation paths of the two endoscopes partially overlap, which can observe the entire furnace mouth process during steel tapping. The field of view is large and the image is clear. Both endoscopes are 120° pinhole corner lenses with a focal length of 3mm to 10mm and a length customized as needed. They are cooled by compressed air and equipped with two vortex cooling systems.

[0009] Two endoscopes are inserted vertically through the small holes in the fireproof sliding door or the dog kennel, making installation and adjustment very convenient. When the fireproof sliding door needs to be opened, the two endoscopes can be pulled out.

[0010] The pneumatic valve platform controls the drive cylinder through the air supply pipe, causing the piston rod of the drive cylinder to extend and retract, while simultaneously driving the rotating arm to rotate around its inner end. The rotating arm then drives the endoscope to be inserted into or removed from the observation hole.

[0011] This embodiment is fixed to the rotating arm by passing a bolt-nut assembly through the positioning hole on the mounting base plate. When the rotating arm rotates, the protective tube is inserted into the opening on the fire baffle door at the rear of the converter. The working condition of the converter is observed in real time through the endoscope body. The dimensions of each side of the mounting base plate are 5mm to 8mm smaller than the dimensions of each corresponding side of the opening on the fire baffle door. When the mounting base plate is fully embedded in the opening, the mounting base plate 33 can basically block the slag from spraying out through the opening of the fire baffle door and the doghouse when the converter taps steel. The gap between the mounting base plate 33 and the opening is used to observe whether there is slag accumulation around the edge of the opening.

[0012] This invention uses two endoscopic lenses to monitor the furnace opening and interior conditions throughout the tapping process, and can also monitor slag (foam slag) falling into the tapping opening in the early stage of tapping, effectively preventing slag from falling into the tapping opening. It also assists in the operation of tilting the furnace downward to achieve the fastest tapping speed and the least amount of slag inclusion at the tapping opening. By combining with the furnace opening slag overflow visual recognition software, the furnace can be stopped or lifted when slag overflows from the furnace opening or tapping opening to prevent accidents.

[0013] The converter's rear fire-blocking sliding door is closed during blowing and tapping, and opened during furnace lining maintenance. The rotating arm is used to rotate and hold the endoscope lens. Depending on the type of fire-blocking sliding door, if it is a lifting fire-blocking sliding door, the rotating arm is fixed to the rear fire-blocking shed; if it is a left-right opening and closing sliding door, the rotating arm is fixed to the sliding door. The endoscope lens is used to observe the converter's working status while preventing damage to the endoscope lens.

[0014] During converter blowing and tapping, the mixture of slag and molten steel flows down along the fire baffle door and the inside of the doghouse. This protective cover can protect the pinhole camera from being burned by the slag.

[0015] The present invention has the following advantages: easy to install, easy to detect, comprehensive detection content, good protection, and extended service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the location of the first opening of the endoscopic device in this invention. Figure 2 This is a schematic diagram illustrating the determination of the position of the second opening of the endoscopic device in this invention. Figure 3 This is a schematic diagram of the installation of the rotating clamping arm in this invention. Figure 4 This is a schematic diagram of the rotating clamping arm rotating clamping unit in this invention. Figure 5 This is a schematic diagram of the rotating arm of the rotating clamping arm in this invention. Figure 6 This is a cross-sectional schematic diagram of the protective cover in this invention. Figure 7 This is a front view of the protective cover base plate in this invention. Detailed Implementation

[0017] The present invention will be further illustrated below through specific embodiments. Example

[0018] A post-furnace endoscope slag overflow system for converter tapping includes an endoscope device, a rotating clamping arm, and a protective cover, such as... Figures 1 to 7 As shown, the specific structure is: The endoscopic device described is as follows Figure 1 and Figure 2 As shown: Includes converter 11, heat insulation wall 12, first endoscope 141, and second endoscope 142. The heat insulation wall 12 is located on the furnace mouth side of the converter 11, and the heat insulation wall 12 is equipped with a liftable fire-blocking sliding door 13; A first opening 121 and a second opening 122 are provided vertically from top to bottom on the heat insulation wall 12. A first endoscope 141 is provided in the first opening 121 and a second endoscope 142 is provided in the second opening 122. The probe ends of both the first endoscope 141 and the second endoscope 142 face the furnace mouth side of the converter 11. The positions of the first opening 121 and the second opening 122 are determined as follows: like Figure 1 As shown: When converter 11 is rotated upward from the horizontal position to the point where the upward direction of the center line of converter 11 and the vertical line forms an angle α, the central axis of the first opening 121 is directly opposite the center point of the furnace mouth of converter 11. like Figure 2 As shown: When converter 11 is rotated downward from the horizontal position to the point where the center line of converter 11 and the upward direction of the vertical line form an angle β, the central axis of the second opening 122 is directly opposite the upper half of converter 11. In this embodiment: In the endoscopic device, both the first endoscopic lens 141 and the second endoscopic lens 142 are 120° pinhole corner endoscopic lenses; α is taken as 60° to 65°, and in this embodiment it is taken as 63°; β is taken as 100° to 110°, and in this embodiment it is taken as 105°.

[0019] The rotating clamping arm, as described above Figures 3-5 As shown: Includes a protective cast iron plate 21, a vertical shaft 22, two rotating clamping units 23, and a pneumatic valve platform 24. The area separated by the protective cast iron plate 21 is the doghouse where the converter is located. The protective cast iron plate 21 has two observation holes from top to bottom. The vertical shaft 22 is fixed vertically to the protective cast iron plate 21; Each rotary clamping unit 23, as shown in Figure 4 As shown: It includes a connecting rod 231, a drive cylinder 232, a rotating arm 233, and an endoscope 234. The endoscope 234 includes a first endoscope 141 and a second endoscope 142. The inner end of the connecting rod 231 is fixed on the vertical shaft 22. The cylinder body of the drive cylinder 232 is parallel to the connecting rod and fixed on the connecting rod 231. The inner end of the rotating arm 233 is rotatably located at the outer end of the connecting rod 231 through a pin. The moving end of the piston rod of the drive cylinder 232 is connected to the middle of the rotating arm 233. When the piston rod of the drive cylinder 232 extends or retracts, it drives the rotating arm 233 to rotate around the inner end. The endoscope 234 is fixed at the outer end of the rotating arm 233. The position of each endoscope 234 is directly opposite an observation hole on a protective cast iron plate 21. The pneumatic valve platform 24 is connected to two drive cylinders 232 respectively through air supply pipes; In this embodiment, the rotating arm 233 is as follows: Figure 5As shown: It includes an arm body 2331, a rear lug 2332, a middle lug 2333, a bracket 2334, and a diagonal brace 2335. The rear end and the middle part of the arm body 2331 are respectively provided with a rear lug 2332 and a middle lug 2333, and the rear lug 2332 and the middle lug 2333 are respectively provided on both sides of the arm body 2331. The bracket 2334 is fixed to the front end of the arm body 2331, and the bracket 2334 and the arm body 2331 are connected by a diagonal brace 2335. The endoscope 234 is fixed on the bracket 2334. Endoscopic lens 234 uses a pinhole corner lens.

[0020] The protective cover, such as Figure 6 and Figure 7 As shown: It includes an endoscope body 31, a protective tube 32, a mounting base plate 33, and a sealing plate 34; A section of the outer wall of the lower half of the top of the protective tube 32 is cut off to form an arc-shaped wall with a central angle of no more than a semicircle, forming an endoscope window 321. The endoscope body 31 is inserted into the inner cavity of the protective tube 32, and the probe at the front end of the endoscope body 31 faces the endoscope window 321. A protective tube fixing hole 331 is provided on one side of the mounting base plate 33. The diameter of the protective tube fixing hole 331 is equal to the diameter of the protective tube 32. At least three positioning holes 332 are provided on the mounting base plate 33 around the protective tube fixing hole 331. The sealing plate 34 is an arc-shaped plate. The sealing plate 34 is fixed to the top of the protective tube 32 by fitting the arc side against the inner side of the top of the protective tube 32. The arc side of the sealing plate 34 and the outer side of the endoscope window 321 are joined together to form a circle. The bottom end of the protective tube 32 is fixed to the protective tube fixing hole 331 of the mounting base plate 33, and the inner cavity of the protective tube 32 is flush with the wall of the protective tube fixing hole 331.

[0021] In this embodiment, the length of the endoscopic window 321 is no more than 20% of the length of the protective tube 32.

[0022] The protective cover described in this embodiment is made and welded from Q235 steel pipes and steel plates, wherein: The protective pipe 32 is made of Q235-A material with an outer diameter of 120mm, a wall thickness of 10mm, and a length of 482mm. The mounting base plate 33 is made of Q235-A material with a length of 170mm, a width of 400mm, and a thickness of 10mm. The sealing plate 34 is made of Q235-A material with an outer diameter of 120mm and a wall thickness of 10mm.

[0023] When using this embodiment: In this embodiment, a first endoscope 141 and a second endoscope 142 are installed at the upper and lower positions of the fire-blocking sliding door 13 and the doghouse, respectively, as close as possible to the center line of the converter 11. The installation height of the endoscopes from the ground is calculated according to the different sizes of the converter and the doghouse, so as to observe the overflow of slag from the taphole of the converter 11 and the situation inside the furnace during tapping. The second endoscope 142, which is installed at a low position, can also observe the slag discharge from the taphole of the converter 11 in a timely and clear manner. The observation start angle α of the first endoscope 141 is 60° to 65°, and the observation end angle β of the second endoscope 142 is 100° to 110°. The observation paths of the two endoscopes partially overlap, which can observe the entire furnace mouth situation during steel tapping. The field of view is large and the image is clear. Both endoscopes are 120° pinhole corner lenses with a focal length of 3mm to 10mm and a length customized as needed. They are cooled by compressed air and equipped with two vortex cooling systems.

[0024] The two endoscopes are inserted vertically through the small holes in the fireproof sliding door 13 or the dog kennel, making installation and adjustment very convenient. When the fire-blocking sliding door 13 needs to be opened, the two endoscopes can be pulled out.

[0025] The pneumatic valve platform 24 controls the drive cylinder 232 through the air supply pipe, causing the piston rod of the drive cylinder 232 to extend and retract, while simultaneously driving the rotating arm 233 to rotate around its inner end. The rotating arm 233 then drives the endoscope lens 234 to be inserted into the observation hole or pulled out.

[0026] The mounting base 33 is fixed to the rotating arm by passing a bolt-nut assembly through the positioning hole 332 on the mounting base 33. When the rotating arm rotates, the protective tube 32 is inserted into the opening on the fire baffle door at the rear of the converter. The working condition of the converter is observed in real time through the endoscope body 31. The dimensions of each side of the mounting base 33 are 5mm to 8mm smaller than the dimensions of each corresponding side of the opening on the fire baffle door. When the mounting base 33 is fully embedded in the opening, the mounting base 33 can basically block the slag from spraying out through the opening of the fire baffle door and the doghouse when the converter taps steel. The gap between the mounting base 33 and the opening is used to observe whether there is slag accumulation around the edge of the opening.

Claims

1. A furnace mouth slag overflow system for converter tapping, comprising an endoscope, a rotating clamping arm, and a protective cover, characterized in that: The endoscopic device includes a converter (11), a heat insulation wall (12), a first endoscopic lens (141), and a second endoscopic lens (142). The heat insulation wall (12) is located on the furnace mouth side of the converter (11), and the heat insulation wall (12) is equipped with a lifting fire-blocking sliding door (13); A first opening (121) and a second opening (122) are provided vertically from top to bottom on the heat insulation wall (12). A first endoscope (141) is provided in the first opening (121), and a second endoscope (142) is provided in the second opening (122). The probe ends of both the first endoscope (141) and the second endoscope (142) face the furnace mouth side of the converter (11). The positions of the first opening (121) and the second opening (122) are determined as follows: When the converter (11) rotates upward from the horizontal position to the point where the center line of the converter (11) and the upward direction of the vertical line form an angle α, the central axis of the first opening (121) is directly opposite the center point of the furnace mouth of the converter (11); When the converter (11) rotates downward from the horizontal position to the point where the center line of the converter (11) and the upward direction of the vertical line form an angle β, the central axis of the second opening (122) is directly opposite the upper half of the converter (11); The rotating clamping arm includes a protective cast iron plate (21), a vertical shaft (22), two rotating clamping units (23), and a pneumatic valve platform (24). The area separated by the protective cast iron plate (21) is the doghouse where the converter is located. The protective cast iron plate (21) has two observation holes from top to bottom. The vertical shaft (22) is fixed vertically on the protective cast iron plate (21); Each rotating clamping unit (23) includes a connecting rod (231), a drive cylinder (232), a rotating arm (233), and an endoscope (234). The inner end of the connecting rod (231) is fixed on the vertical shaft (22). The cylinder body of the drive cylinder (232) is parallel to the connecting rod and fixed on the connecting rod (231). The inner end of the rotating arm (233) is rotatably located at the outer end of the connecting rod (231). The moving end of the piston rod of the drive cylinder (232) is connected to the middle of the rotating arm (233). When the piston rod of the drive cylinder (232) extends or retracts, it drives the rotating arm (233) to rotate around the inner end. The endoscope (234) is fixed at the outer end of the rotating arm (233). The position of each endoscope (234) is directly opposite an observation hole on a protective cast iron plate (21). The pneumatic valve platform (24) is connected to two drive cylinders (232) respectively through an air supply pipe; The protective cover includes an endoscope body (31), a protective tube (32), a mounting base plate (33), and a sealing plate (34); A section of the outer wall of the lower half of the top part of the protective tube (32) is cut off to form an endoscopic window (321) with a central angle of no more than a semicircle. The endoscope body (31) is inserted into the inner cavity of the protective tube (32). The probe at the front end of the endoscope body (31) faces the endoscopic window (321). A protective tube fixing hole (331) is provided on one side of the mounting base plate (33). The diameter of the protective tube fixing hole (331) is equal to the diameter of the protective tube (32). The mounting base plate (33) is surrounded by the protective tube fixing hole. 331) It is provided with at least three positioning holes (332), the sealing plate (34) is an arc-shaped plate, the sealing plate (34) is fixed to the top of the protective tube (32) by means of the arc side fitting against the inner side of the top of the protective tube (32), the arc side of the sealing plate (34) and the outer side of the endoscope window (321) are joined together to form a circle, the bottom end of the protective tube (32) is fixed on the protective tube fixing hole (331) of the mounting base plate (33) and the inner cavity of the protective tube (32) is flush with the hole wall of the protective tube fixing hole (331).

2. The furnace mouth slag overflow system for converter tapping as described in claim 1, characterized in that: In the endoscopic device, both the first endoscope (141) and the second endoscope (142) are 120° pinhole corner endoscopes; The rotating clamping arm includes an arm body (2331), a rear lug (2332), a middle lug (2333), a bracket (2334), and a diagonal brace (2335). The rear end and middle part of the arm body (2331) are respectively provided with a rear lug (2332) and a middle lug (2333), and the rear lug (2332) and the middle lug (2333) are respectively provided on both sides of the arm body (2331). The bracket (2334) is fixed to the front end of the arm body (2331), and the bracket (2334) and the arm body (2331) are connected by a diagonal brace (2335). The endoscope (234) is fixed on the bracket (2334). In the protective cover, the length of the endoscope window (321) is no more than 20% of the length of the protective tube (32).

3. The furnace mouth slag overflow system for converter tapping as described in claim 1 or 2, characterized in that: In the aforementioned endoscopic device, α is 60° to 65°, and β is 100° to 110°; In the aforementioned rotating clamping arm, the endoscope (234) is selected as a pinhole corner lens.

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