Blast furnace seal valve

Abstract

The application provides a blast furnace sealing valve, which comprises a valve seat, a valve plate and a driving mechanism, and the driving mechanism is connected with the valve plate through a transmission mechanism. The transmission mechanism comprises: a first driving shaft connected with the driving mechanism; a second driving shaft connected with the driving mechanism; a connecting rod assembly comprising a head-end connecting rod, a tail-end connecting rod and a middle connecting rod, the head-end connecting rod is connected with the first driving shaft, the tail-end connecting rod is connected with the second driving shaft, and the middle connecting rod is connected with the valve plate; the driving mechanism drives the first driving shaft to rotate, so as to drive the head-end connecting rod to rotate, drive the middle connecting rod and the valve plate to move, and make the valve plate be in a closed position or a disengaged position; the driving mechanism drives the second driving shaft to rotate in a first direction or a second direction, so as to drive the tail-end connecting rod to rotate, drive the middle connecting rod and the valve plate to move, and make the valve plate be in a rotated open position or a disengaged position. Under the action of the two driving shafts and the connecting rod assembly, the valve plate can be deflected to the side of the valve seat when being opened, so that the blast furnace sealing valve occupies less height space.

Description

Technical Field

[0001] This application belongs to the technical field of bellless blast furnace top for ironmaking, and particularly relates to a blast furnace sealing valve for blast furnace top. Background Technology

[0002] With decades of development in China's ironmaking equipment, a modern system centered on blast furnaces has been formed, characterized by large scale, automation, energy conservation, and environmental protection, and it occupies a dominant position. Therefore, structural innovation and design of blast furnace equipment remain of great significance to the development of the ironmaking industry.

[0003] The function of the blast furnace sealing valve is to reliably seal the charge tank, thereby enabling pressurized operation of the blast furnace. It is a key component of the bell-less blast furnace top system. However, most blast furnace sealing valves currently use a single-acting design. While single-acting valves are simple in structure, their single movement causes the valve plate to rotate around one side of itself during opening and closing, occupying a significant amount of vertical space and thus severely limiting the height of the blast furnace sealing valve. Furthermore, for the replacement of old bell-type blast furnaces with bell-less blast furnace tops, the long vertical stroke of the valve plate limits the success rate of the conversion, hindering the development of bell-less blast furnace tops as a replacement for old bell-type blast furnace tops. Utility Model Content

[0004] To address the aforementioned technical problems in the prior art, this application provides a blast furnace sealing valve that employs a dual-action mechanism to significantly reduce height.

[0005] The technical solution adopted in this application embodiment is: a blast furnace sealing valve, including a valve seat, a valve plate, and a driving mechanism. The valve seat is located at the lower end of the feed throat at the top of the blast furnace and has a feed channel communicating with the feed throat. The driving mechanism is connected to the valve plate through a transmission mechanism and is used to drive the valve plate to rotate to open or close the feed channel of the valve seat. The transmission mechanism includes:

[0006] The first drive shaft is connected to the drive mechanism and rotates around its own axis under the action of the drive mechanism.

[0007] The second drive shaft is connected to the drive mechanism and rotates around its own axis under the action of the drive mechanism. The second drive shaft is arranged in parallel with the first drive shaft.

[0008] A linkage assembly includes a head link at one end, a tail link at the other end, and an intermediate link connecting the head link and the tail link. The head link is connected to a first drive shaft, the tail link is connected to a second drive shaft, and the intermediate link is connected to a valve plate.

[0009] The driving mechanism drives the first driving shaft to rotate along a first direction or a second direction opposite to the first direction. The first driving shaft drives the first end connecting rod to rotate downward or upward, and drives the middle connecting rod and the valve plate to move downward or upward, so that the valve plate is in a disengaged position disengaged from the valve seat or in a closed position that closes the feed channel of the valve seat. The driving mechanism drives the second driving shaft to rotate along the second direction or the first direction. The second driving shaft drives the tail end connecting rod to rotate upward or downward, and drives the middle connecting rod and the valve plate to rotate to a side away from the bottom of the valve seat or rotate back to the bottom of the valve seat, so that the valve plate is in an open position or a disengaged position.

[0010] In an optional embodiment, the linkage assembly includes a first linkage mechanism and a second linkage mechanism symmetrically arranged on opposite sides of the valve seat in the radial direction. The first linkage mechanism and the second linkage mechanism have the same structure and each includes a head link, a tail link, and an intermediate link located between the head link and the tail link. The head links of both linkage mechanisms are connected to the first drive shaft, the tail links of both linkage mechanisms are connected to the second drive shaft, and the intermediate links of both linkage mechanisms are connected to the valve plate.

[0011] In an optional embodiment, both the first linkage mechanism and the second linkage mechanism include two intermediate links, namely a first intermediate link and a second intermediate link. One end of the first intermediate link is connected to the end of the first drive shaft that is not connected to the first end link, and the other end of the first intermediate link is connected to one end of the second intermediate link. The other end of the second intermediate link is connected to the end of the tail link that is not connected to the second drive shaft. The first intermediate link is connected to the valve plate.

[0012] In an optional embodiment, the first intermediate links of the first linkage mechanism and the second linkage mechanism extend toward each other and are connected to form a support plate that is supported below the valve plate and connected to the valve plate.

[0013] In an optional embodiment, the first drive shaft and the second drive shaft are arranged in parallel, with the first drive shaft located diagonally above the second drive shaft and close to the feed throat; the first connecting rod of the first linkage mechanism is connected to the first end of the first drive shaft, and the tail connecting rod of the first linkage mechanism is connected to the first end of the second drive shaft; the first connecting rod of the second linkage mechanism is connected to the second end of the first drive shaft, and the tail connecting rod of the second linkage mechanism is connected to the second end of the second drive shaft.

[0014] In an optional embodiment, the first intermediate connecting rod includes a transverse portion abutting against the radially opposite sides of the valve plate and a vertical portion connected to one end of the transverse portion. The vertical portion extends obliquely outward from the end closer to the valve plate to the end farther away from the valve plate, so as to gradually move away from the valve plate. The other end of the transverse portion is connected to one end of the second intermediate connecting rod, and the end of the vertical portion away from the valve plate is connected to the first end connecting rod.

[0015] In an optional embodiment, the valve plate is disc-shaped, and its outer periphery protrudes upward and outward to form a flared outer edge;

[0016] The lower outer periphery of the valve seat is a frustum that fits the outer edge of the valve plate, and a sealing ring is fitted on the frustum.

[0017] In an optional embodiment, a limiting member is provided in the space outside the feed throat. The limiting member is located below the tail end connecting rod and is used to limit the tail end connecting rod when the valve plate switches from the open position to the closed position.

[0018] In an optional embodiment, the driving mechanism includes a clamping cylinder and a rotating cylinder. The clamping cylinder is connected to the first driving shaft and is used to drive the first driving shaft to rotate along the first direction or the second direction. The rotating cylinder is connected to the second driving shaft and is used to drive the second driving shaft to rotate along the second direction or the first direction.

[0019] Compared with the prior art, the beneficial effects of the embodiments of this application are as follows: This application adopts a linkage double-action structure, and through precise double-action coordination, it makes better use of the annular space between the box body of the blast furnace top and the feed throat, so that the valve plate deflects to the annular space when it is opened, effectively reducing the height of the blast furnace sealing valve and saving limited space.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this application.

[0021] The overview of various implementations or examples of the technology described in this application is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0022] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The drawings generally illustrate various embodiments by way of example rather than limitation and are used, together with the description and claims, to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0023] Figure 1 This is a three-dimensional structural diagram of the transmission mechanism and valve plate assembled together according to an embodiment of this application.

[0024] Figures 2 to 4 These are side views of the transmission mechanism and valve plate assembled together, respectively, according to embodiments of this application; wherein, Figure 2 The valve plate is in the closed position. Figure 3 The valve plate is in the disengaged position. Figure 4 The valve plate is in the open position.

[0025] Figures 5 to 7 These are three-dimensional structural diagrams showing the transmission mechanism, valve seat, and valve plate assembled together, respectively, according to embodiments of this application; wherein... Figure 5 The valve plate is in the closed position. Figure 6 The valve plate is in the disengaged position. Figure 7 The valve plate is in the open position.

[0026] Figure 8 and Figure 9 These are three-dimensional structural schematic diagrams of the first intermediate connecting rod from different perspectives, representing embodiments of this application.

[0027] Figures 10 to 12 These are cross-sectional views of the furnace top sealing ring applied to the blast furnace top according to embodiments of this application; wherein, Figure 10 The valve plate is in the closed position. Figure 11 The valve plate is in the disengaged position. Figure 12 The valve plate is in the open position.

[0028] Figure label:

[0029] 1-Valve seat; 11-Feed channel; 12-Frustum surface; 13-Sealing ring;

[0030] 2-Valve plate; 21-Outer edge;

[0031] 31-First drive shaft; 32-Second drive shaft; 33-First linkage mechanism; 34-Second linkage mechanism; 331-First end link; 332-Tail end link; 333-First intermediate link; 3331-Horizontal part; 3332-Vertical part; 3333-Bent part; 334-Second intermediate link;

[0032] 4-Plate;

[0033] 5-Limiting components;

[0034] 6-Feed throat; 61-Annular space; 7-Box body. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0036] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] To keep the following description of the embodiments of this application clear and concise, detailed descriptions of known functions and known components are omitted.

[0038] This application provides a blast furnace sealing valve for use on the top of a blast furnace. For example... Figures 1 to 7 As shown, the blast furnace sealing valve includes a valve seat 1, a valve plate 2, a drive mechanism (not shown in the figure), and a transmission mechanism. The valve seat 1 is located at the lower end of the feed throat 6 at the top of the blast furnace and has a feed channel 11 communicating with the feed throat 6. The drive mechanism is connected to the valve plate 2 through the transmission mechanism and is used to drive the valve plate 2 to rotate, so that the valve plate 2 has a closed position, a disengaged position, and a rotated position. In the closed position, the valve plate 2 closes the feed channel 11 of the valve seat 1; in the disengaged position, the valve plate 2 is disengaged from the valve seat 1, but not away from the feed channel 11 of the valve seat 1; in the rotated position, the valve plate 2 rotates away from the valve seat 1, and the feed channel 11 of the valve seat 1 is fully opened.

[0039] Continue to combine Figures 1 to 7The transmission mechanism includes a first drive shaft 31, a second drive shaft 32, and a connecting rod assembly. The first drive shaft 31 is connected to the drive mechanism and rotates around its own axis under the action of the drive mechanism. The second drive shaft 32 is also connected to the drive mechanism and rotates around its own axis under the action of the drive mechanism. The second drive shaft 32 is arranged parallel to and spaced apart from the first drive shaft 31. That is, the positions of the first drive shaft 31 and the second drive shaft 32 are fixed, but they can rotate. The connecting rod assembly includes a first connecting rod 331 at one end, a tail connecting rod 332 at the other end, and an intermediate connecting rod connecting the first connecting rod 331 and the tail connecting rod 332. The first connecting rod 331 is connected to the first drive shaft 31, the tail connecting rod 332 is connected to the second drive shaft 32, and the intermediate connecting rod is connected to the valve plate 2. The drive mechanism drives the first drive shaft 31 to rotate in a first direction or a second direction opposite to the first direction. The first drive shaft 31 drives the first end connecting rod 331 to rotate downward or upward, and drives the middle connecting rod and valve plate 2 to move downward or upward, so that the valve plate 2 is in the disengaged position of being disengaged from the valve seat 1 or in the closed position of closing the feed channel 11 of the valve seat 1. The drive mechanism drives the second drive shaft 32 to rotate in a second direction or a first direction. The second drive shaft 32 drives the tail end connecting rod 332 to rotate upward or downward, and drives the middle connecting rod and valve plate 2 to rotate to the side away from the bottom of the valve seat 1 or rotate back to the bottom of the valve seat 1, so that the valve plate 2 is in the open position or the disengaged position.

[0040] Specifically, when valve plate 2 switches from the closed position to the open position, the drive mechanism first drives the first drive shaft 31 to rotate in the first direction. The first drive shaft 31 drives the first end connecting rod 331 to rotate downward, and drives the intermediate connecting rod and valve plate 2 to move downward, so that valve plate 2 switches to the disengaged position, which is disengaged from valve seat 1. See [link to relevant documentation]. Figure 3 , Figure 6 Right now Figure 11 At this point, the first drive shaft 31 stops rotating and remains stationary. The drive mechanism then drives the second drive shaft 32 to rotate in the second direction. The second drive shaft 32 drives the tail-end connecting rod 332 to rotate upward, and simultaneously drives the intermediate connecting rod and valve plate 2 to rotate upward and to the side away from below the valve seat 1, so that the valve plate is kept in the space outside the feed throat 6. At this time, the valve plate 2 is in the open position, and the valve plate 2 avoids the bottom of the valve seat 1 to ensure smooth feeding. When the valve plate 2 switches from the open position to the closed position, the transmission mechanism operates in the reverse process described above.

[0041] The blast furnace sealing valve of this application embodiment utilizes the sequential rotation of two drive shafts, combined with the connecting rod assembly, to drive the valve plate 2 to move up and down and rotate. This not only enables the valve plate 2 and valve seat 1 to close and open, meeting the requirements for use of the sealing valve, but also allows the valve plate 2 to be positioned to the side of the feed throat 6 and valve body when in the open position, avoiding the occupation of space below the valve body. This effectively reduces the blast furnace sealing valve's occupation in the height direction, saving limited space, and allowing for a large-scale rotation of the valve plate 2.

[0042] In some embodiments, such as Figure 1 , Figures 5 to 7 As shown, the linkage assembly includes a first linkage mechanism 33 and a second linkage mechanism 34 symmetrically arranged on opposite sides of the valve seat 1 in the radial direction. The first linkage mechanism 33 and the second linkage mechanism 34 have identical structures, each including a leading link 331, a trailing link 332, and an intermediate link located between the leading link 331 and the trailing link 332. The leading link 331 of both linkage mechanisms is connected to the first drive shaft 31, the trailing link 332 of both linkage mechanisms is connected to the second drive shaft 32, and the intermediate link of both linkage mechanisms is connected to the valve plate 2. By employing two symmetrically arranged linkage mechanisms, forces can be applied to the valve plate 2 from opposite sides, ensuring the smoothness of the valve plate 2's opening and closing process and allowing the valve plate 2 to run along a predetermined trajectory.

[0043] For example, such as Figures 2 to 4 As shown, both the first linkage mechanism 33 and the second linkage mechanism 34 have two intermediate links, namely the first intermediate link 333 and the second intermediate link 334. One end of the first intermediate link 333 is connected to the end of the first end link 331 that is not connected to the first drive shaft 31, and the other end of the first intermediate link 333 is connected to one end of the second intermediate link 334. The other end of the second intermediate link 334 is connected to the end of the tail end link 332 that is not connected to the second drive shaft 32. The first intermediate link 333 is connected to the valve plate 2. The first linkage mechanism 33 and the second linkage mechanism 34 respectively form a four-bar linkage.

[0044] In some embodiments, such as Figure 8 and Figure 9 As shown, the first intermediate connecting rods 333 of the first linkage mechanism 33 and the second linkage mechanism 34 extend towards each other and connect to form a support plate 4 that supports the valve plate 2 from below and is connected to the valve plate 2. This not only facilitates the connection between the first intermediate connecting rod 333 and the valve plate 2, but also ensures the stability of the valve plate 2 relative to the first intermediate connecting rod 333, allowing it to move synchronously with the first intermediate connecting rod 333. Optionally, the first intermediate connecting rods 333 and the support plate 4 of the two linkage mechanisms can be an integral structure, reducing the number of parts and facilitating assembly.

[0045] Preferred, such as Figure 1 , Figures 5 to 7As shown, the first drive shaft 31 and the second drive shaft 32 are arranged side by side in parallel. The first drive shaft 31 is located diagonally above the second drive shaft 32 and close to the feed throat 6 (see Figure 6). Figures 10 to 12 This arrangement positions the first connecting rod 331 above the tail connecting rod 332 and the second intermediate connecting rod 334. The first connecting rod 331 of the first linkage mechanism 33 is connected to the first end of the first drive shaft 31, and the tail connecting rod 332 of the first linkage mechanism 33 is connected to the first end of the second drive shaft 32. The first connecting rod 331 of the second linkage mechanism 34 is connected to the second end of the first drive shaft 31, and the tail connecting rod 332 of the second linkage mechanism 34 is connected to the second end of the second drive shaft 32. This structural layout is reasonable, so that the first drive shaft 31, located at the upper angle, uses the first connecting rod 331 at the upper position of the linkage mechanism to first drive the valve plate 2 downward to disengage from the valve seat 1. Then, the second drive shaft 32, located at the lower angle, uses the tail connecting rod 332 at the lower position of the linkage mechanism to continue to drive the valve plate 2 upward while rotating it, and rotating it to the side of the feed throat 6 and the valve seat 1.

[0046] In some embodiments, the first intermediate connecting rod 333 includes a transverse portion 3331 disposed on opposite sides in the radial direction near the valve plate 2, and a vertical portion 3332 connected to one end of the transverse portion 3331. The transverse portion 3331 and the vertical portion 3332 generally form an L-shape. The vertical portion 3332 gradually extends obliquely outward from the end near the valve plate 2 to the end away from the valve plate 2, gradually moving away from the valve plate 2. That is, the transverse portion 3331 is located on the outer side of the valve plate 2 and close to the valve plate 2, and has a gap with the outer periphery of the valve plate 2. The other end of the transverse portion 3331 is connected to one end of the second intermediate connecting rod 334, and the end of the vertical portion 3332 away from the valve plate 2 is connected to the first connecting rod 331. Furthermore, the end of the vertical portion 3332 away from the transverse portion 3331 extends toward the first connecting rod 331 to form a bent portion 3333, so that the first intermediate connecting rod 333 forms a generally U-shaped structure. By designing the first intermediate connecting rod 333 into a special shape that is not straight, it is not only easy to connect it with the first connecting rod 331, the second intermediate connecting rod 334 and the valve plate 2, but also the entire connecting rod mechanism can drive the valve plate 2 to deflect to the side of the feed throat 6 and the valve seat 1 during the opening process, so as to reduce the space occupied in the height direction and effectively reduce the height of the blast furnace sealing valve.

[0047] like Figure 9 As shown, the valve plate 2 can be disc-shaped, and its outer periphery protrudes upward and outward to form a flared outer edge 21, so that the inner surface of the outer edge 21 is a slope (this slope forms the sealing surface of the valve plate 2). Figure 11 and Figure 12As shown, the lower outer periphery of the valve seat 1 is a frustum 12 (also a slope, which forms the sealing surface of the valve seat 1) that matches the outer edge 21 of the valve plate 2. Thus, when the valve plate 2 is switched to the closed position, the outer edge 21 of the valve plate 2 is tightly fitted with the frustum 12 of the valve seat 1 and sealed by the sealing ring 13, thereby sealing the feed channel 11 and preventing unnecessary air leakage.

[0048] like Figures 10 to 12 As shown, a limiting member 5 is provided in the space outside the feed throat 6. The limiting member 5 is located below the tail end connecting rod 332. It is used to limit the tail end connecting rod 332 when the valve plate 2 is switched from the open position to the closed position, so that the tail end connecting rod 332 is kept in the initial position and the tail end connecting rod 332 is prevented from moving downward too much, which would damage the sealing surfaces of the valve plate 2 and the valve seat 1.

[0049] Continue to combine Figures 10 to 12 The blast furnace top also includes a housing 7, within which the feed throat 6 is located. The axis of the feed throat 6 is collinear with the centerline of the housing 7, meaning the feed throat 6 is centrally located within the housing 7. An annular space 61 is formed between the feed throat 6 and the housing 7, and both drive shafts and the transmission mechanism are located within this annular space 61. The valve plate 2, when in the open position, is also located within the annular space 61. The annular space 61 is the space outside (to the side) of the feed throat 6 mentioned above.

[0050] The specific form of the drive mechanism is not limited, as long as it can drive the two drive shafts to rotate separately. For example, the drive mechanism includes a clamping cylinder and a rotating cylinder (not shown in the figure), both located outside the housing 7. A first drive shaft 31 extends out of the housing 7 and is connected to the clamping cylinder, which drives the first drive shaft 31 to rotate in a first direction. A second drive shaft 32 extends out of the housing 7 and is connected to the rotating cylinder, which drives the second drive shaft 32 to rotate in a second direction.

[0051] When using, such as Figure 2 , Figure 5 and Figure 10 As shown, the blast furnace sealing valve is in a sealed state, that is, the valve plate 2 is in the closed position of the feed channel 11 of the valve seat 1. At this time, the clamping cylinder is activated, driving the first drive shaft 31 to rotate in the first direction (i.e., clockwise in the figure). The first drive shaft 31 drives the end of the first connecting rod 331 connected to the first intermediate connecting rod 333 to rotate downward, that is, the hinge point of the first connecting rod 331 and the first intermediate connecting rod 333 rotates downward. The first intermediate connecting rod 333 moves downward, and drives the valve plate 2 to move downward, so as to disengage from the valve seat 1, so that the valve plate 2 is in the disengaged position. See Figure 3 , Figure 6 and Figure 11The clamping cylinder stops moving. Then, the rotary cylinder starts, driving the second drive shaft 32 to rotate in the second direction (i.e., counterclockwise in the figure). The second drive shaft 32 drives the end of the tail connecting rod 332 connected to the second intermediate connecting rod 334 to rotate upward, that is, the hinge point of the tail connecting rod 332 and the second intermediate connecting rod 334 rotates upward, and the second intermediate connecting rod 334 pulls the first intermediate connecting rod 333 and the valve plate 2 to rotate in a direction away from the bottom of the valve seat 1, so that the valve plate 2 rotates to the side of the feed throat 6 (annular space 61). At this time, the valve plate 2 is in the open position. See Figure 4 , Figure 7 and Figure 12 .

[0052] The above process describes the opening of valve plate 2 from the closed position to the disengaged position and then to the open position. When valve plate 2 needs to move from the open position to the disengaged position and then back to the closed position, the reverse operation is used. That is, the rotary cylinder must first be activated to drive the second drive shaft 32 to rotate in the first direction. The tail connecting rod 332 and the second intermediate connecting rod 334 then drive the first intermediate connecting rod 333 and valve plate 2 to move, causing valve plate 2 to move downwards and simultaneously rotate to below valve seat 1, achieving... Figure 3 , Figure 6 and Figure 11 The valve plate is in the disengaged position as shown. Then, the clamping cylinder is activated to drive the first drive shaft 31 to rotate in the second direction. The first connecting rod 331 and the first intermediate connecting rod 333 pull the valve plate 2 upward and tightly fit it against the outer periphery of the lower end of the valve seat 1, thereby sealing the feed channel 11 of the valve seat 1. At this time, the valve plate 2 is in the disengaged position. Figure 4 , Figure 7 and Figure 12 The screen is closed as shown.

[0053] The blast furnace sealing valve achieves the entire process from sealing to depressurization within a compact housing 7 through the close cooperation of two actions. While achieving sealing, it greatly reduces the space occupied by the blast furnace sealing valve in the vertical direction during opening and closing, solving the problem that the height of traditional blast furnace sealing valves cannot be reduced.

[0054] The above description is intended to be illustrative and not restrictive. Those skilled in the art can make variations, modifications, substitutions, and alterations to the above embodiments within the scope of this disclosure. Moreover, the above examples (or one or more of them) can be used in combination with each other, and these embodiments can be combined with each other in various combinations or arrangements.

Claims

1. A blast furnace sealing valve, comprising a valve seat, a valve plate, and a driving mechanism, wherein the valve seat is disposed at the lower end of the feed throat at the top of the blast furnace and has a feed channel communicating with the feed throat, and the driving mechanism is connected to the valve plate via a transmission mechanism for driving the valve plate to rotate to open or close the feed channel of the valve seat, characterized in that, The transmission mechanism includes: The first drive shaft is connected to the drive mechanism and rotates around its own axis under the action of the drive mechanism. The second drive shaft is connected to the drive mechanism and rotates around its own axis under the action of the drive mechanism. The second drive shaft is arranged in parallel with the first drive shaft. A linkage assembly includes a head link at one end, a tail link at the other end, and an intermediate link connecting the head link and the tail link. The head link is connected to a first drive shaft, the tail link is connected to a second drive shaft, and the intermediate link is connected to a valve plate. The driving mechanism drives the first driving shaft to rotate along a first direction or a second direction opposite to the first direction. The first driving shaft drives the first end connecting rod to rotate downward or upward, and drives the middle connecting rod and the valve plate to move downward or upward, so that the valve plate is in a disengaged position disengaged from the valve seat or in a closed position that closes the feed channel of the valve seat. The driving mechanism drives the second driving shaft to rotate along the second direction or the first direction. The second driving shaft drives the tail end connecting rod to rotate upward or downward, and drives the middle connecting rod and the valve plate to rotate to a side away from the bottom of the valve seat or rotate back to the bottom of the valve seat, so that the valve plate is in an open position or a disengaged position.

2. The blast furnace sealing valve according to claim 1, characterized in that, The linkage assembly includes a first linkage mechanism and a second linkage mechanism symmetrically arranged on opposite sides of the valve seat in the radial direction. The first linkage mechanism and the second linkage mechanism have the same structure and each includes a head link, a tail link, and an intermediate link located between the head link and the tail link. The head links of both linkage mechanisms are connected to the first drive shaft, the tail links of both linkage mechanisms are connected to the second drive shaft, and the intermediate links of both linkage mechanisms are connected to the valve plate.

3. The blast furnace sealing valve according to claim 2, characterized in that, Both the first linkage mechanism and the second linkage mechanism have two intermediate links, namely a first intermediate link and a second intermediate link. One end of the first intermediate link is connected to the end of the first drive shaft that is not connected to the first end link, and the other end of the first intermediate link is connected to one end of the second intermediate link. The other end of the second intermediate link is connected to the end of the tail link that is not connected to the second drive shaft. The first intermediate link is connected to the valve plate.

4. The blast furnace sealing valve according to claim 3, characterized in that, The first intermediate links of the first linkage mechanism and the second linkage mechanism extend toward each other and are connected to form a support plate that is supported below the valve plate and connected to the valve plate.

5. The blast furnace sealing valve according to claim 3, characterized in that, The first drive shaft and the second drive shaft are arranged in parallel, with the first drive shaft located diagonally above the second drive shaft and close to the feed throat; the first connecting rod of the first linkage mechanism is connected to the first end of the first drive shaft, and the tail connecting rod of the first linkage mechanism is connected to the first end of the second drive shaft; the first connecting rod of the second linkage mechanism is connected to the second end of the first drive shaft, and the tail connecting rod of the second linkage mechanism is connected to the second end of the second drive shaft.

6. The blast furnace sealing valve according to claim 3, characterized in that, The first intermediate connecting rod includes a transverse portion abutting against the radially opposite sides of the valve plate and a vertical portion connected to one end of the transverse portion. The vertical portion extends obliquely outward from the end closer to the valve plate to the end farther away from the valve plate, so as to gradually move away from the valve plate. The other end of the transverse portion is connected to one end of the second intermediate connecting rod, and the end of the vertical portion away from the valve plate is connected to the first end connecting rod.

7. The blast furnace sealing valve according to claim 3, characterized in that, The valve plate is disc-shaped, and its outer periphery protrudes upward and outward to form a flared outer edge; The lower outer periphery of the valve seat is a frustum that fits the outer edge of the valve plate, and a sealing ring is fitted on the frustum.

8. The blast furnace sealing valve according to claim 1, characterized in that, A limiting member is provided in the space outside the feed throat. The limiting member is located below the tail end connecting rod and is used to limit the tail end connecting rod when the valve plate switches from the open position to the closed position.

9. The blast furnace sealing valve according to claim 1, characterized in that, The driving mechanism includes a clamping cylinder and a rotating cylinder. The clamping cylinder is connected to the first driving shaft and is used to drive the first driving shaft to rotate along the first direction or the second direction. The rotating cylinder is connected to the second driving shaft and is used to drive the second driving shaft to rotate along the second direction or the first direction.

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