Sintering machine sealing device

Abstract

The sealing device of a sintering machine includes: a sealing plate in contact with the bottom of a trolley; a support plate arranged below the sealing plate; a rotating shaft seat with an opening at the top, the rotating shaft seat is a hollow tube with an arc-shaped vertical section, the support plate is rotatably arranged in the rotating shaft seat, the upper part of the support plate extends out from the opening of the rotating shaft seat and is connected to the sealing plate; before the trolley contacts the sealing plate, the front end of the sealing plate is lower than the rear end of the sealing plate. The sealing device of the present invention adopts a support plate connected to the sealing plate, and the support plate is rotatably arranged in the rotating shaft seat. The contact area between the support plate and the inner wall of the rotating shaft seat is smaller, the friction force is small, and the support plate can be driven to rotate in the rotating shaft seat with a smaller force, and the rotation is more flexible, and the shaft is not easily stuck, thereby ensuring the contact between the sealing plate and the bottom beam of the trolley and ensuring the sealing effect. The present invention has a simple structure and a good sealing effect.

Description

Technical Field

[0001] The invention relates to the technical field of sintering equipment, and in particular to a sealing device for the head and tail sealing or the middle sealing of a sintering machine wind box. Background Art

[0002] In steel production, sintering production is one of the important processes, which provides high-quality raw materials for blast furnace ironmaking. In the existing sintering system, the sintering machine bellows is set under the sintering machine trolley. After the sintering machine trolley is filled with mixed materials, it runs along the trolley tracks on both sides of the bellows. The ignition furnace ignites the top of the mixed materials, and the bellows exhaust air at the bottom of the sintering machine trolley, so that the mixed materials are sintered from the top of the sintering machine trolley downward. In order to achieve a good exhaust effect of the bellows, it is necessary to ensure that there is a reliable seal between the sintering machine bellows and the sintering machine trolley, without air leakage or as little air leakage as possible. The head and tail ends and the middle of the sintering machine bellows need to be sealed with sealing devices.

[0003] The sealing device used for the front and rear sealing or the middle sealing of the sintering machine bellows usually includes a sealing plate in contact with the bottom of the trolley beam. The sealing plate is arranged on the crossbeam at the top of the bellows. The length of the sealing plate (the dimension perpendicular to the direction of travel of the trolley) is equal to the width of the bottom beam of the trolley. When the trolley runs through the sealing plate, the top surface of the sealing plate contacts the bottom of the bottom beam of the trolley, thereby achieving the purpose of sealing. In order to keep the sealing plate and the bottom of the bottom beam of the trolley in a contact and sealed state during the movement of the trolley, some sealing devices are provided with an elastic element such as a spring at the bottom of the sealing plate. The elastic force of the elastic element pushes the sealing plate upward, so that the sealing plate contacts the bottom of the bottom beam of the trolley. However, the deformation of the elastic element is small, and the supporting force provided to the sealing plate is sometimes insufficient to ensure that the sealing plate always keeps in contact with the bottom of the bottom beam of the trolley during the operation of the trolley, thereby causing air leakage. Moreover, in order to ensure that the elastic element can always push the sealing plate upward, if the elastic force of the elastic element is too large, the upward force of the sealing plate will be too large, and the generated reaction force may scratch the sealing plate when the trolley is running, which may easily cause damage to both the trolley or the sealing plate.

[0004] To this end, someone has proposed a swingable sealing plate structure, in which the sealing plate is installed on the beam at the top of the bellows through a hinge shaft, and by providing components such as a counterweight block or a spring or a connecting rod, the front end of the sealing plate is kept lower than the rear end of the sealing plate under normal conditions (when the trolley has not moved to the sealing plate), and faces the trolley in an inclined state. When the trolley moves to the position of the sealing plate, it can contact the sealing plate in a state similar to an uphill slope. At the same time, during the movement of the trolley, the sealing plate rotates around the hinge shaft under the action of the gravity of the trolley, so that the sealing plate can always be kept in contact with the trolley beam, avoiding air leakage between the trolley beam and the sealing plate. While reducing air leakage, it can also avoid the sintered material particles from entering between the trolley beam and the sealing plate with the airflow, causing wear on the sealing surface of the sealing plate, which is beneficial to extending the service life of the sealing plate. However, this type of swing-type sealing plate uses a hinge structure to realize the rotation of the sealing plate. The hinge and the sleeve are in contact on the entire circumference. If the hinge and the sleeve ends are not sealed well, sintered material particles enter the sleeve, or the friction between the outer wall of the hinge and the inner wall of the sleeve increases after long-term use, the shaft is easily stuck, making the rotation of the sealing plate inflexible or even malfunctioning, affecting the seal between the sealing plate and the trolley beam. In addition, the existing sealing structure also requires other components such as counterweights and springs to realize the downward tilt of the sealing plate facing the direction of travel of the trolley under normal conditions. It has many parts and a complex structure, and it is also impossible to achieve the seal between the bottom of the sealing plate and the top of the bellows beam. Summary of the invention

[0005] The purpose of the present invention is to provide a sintering machine sealing device with simple structure and good sealing effect, which can be used for the head and tail sealing of the sintering machine wind box or the middle sealing of the sintering machine.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The sintering machine sealing device comprises: a sealing plate in contact with the bottom of a trolley; a supporting plate arranged below the sealing plate; a rotating shaft seat with an opening at the top, the rotating shaft seat is a hollow tube with an arc-shaped vertical section, the supporting plate is rotatably arranged in the rotating shaft seat, the upper part of the supporting plate extends out from the opening of the rotating shaft seat and is connected to the sealing plate; before the trolley is not in contact with the sealing plate, the front end of the sealing plate is lower than the rear end of the sealing plate.

[0008] Furthermore, the connection position between the support plate and the sealing plate is not at the center of the width of the sealing plate, and the sealing plate is divided into a front part and a rear part by the connection position between the support plate and the sealing plate, and the length of the front part is greater than the length of the rear part.

[0009] Furthermore, the bottom surface of the support plate is a curved surface.

[0010] Furthermore, a sealing filling material is arranged in the rotating shaft seat to seal the gap between the opening of the rotating shaft seat and the supporting plate.

[0011] Furthermore, a secondary support portion is provided on the support plate, the intersection of the axis of the secondary support portion and the axis of the support plate is the center of the vertical cross-section shape of the shaft seat, and the end of the secondary support portion is in contact with the inner wall of the shaft seat.

[0012] Furthermore, the auxiliary supporting parts are symmetrically arranged on both sides of the supporting plate.

[0013] Furthermore, the space in the rotating shaft seat above the auxiliary supporting portion is filled with sealing filling material.

[0014] Furthermore, the end of the auxiliary supporting portion is a curved surface.

[0015] Furthermore, it also includes reinforcing ribs for fixing the rotating shaft seat.

[0016] Furthermore, it also includes an elastic adjustment component, which includes a base, an upper cover, a support spring, a positioning bolt and a sealing filler; the base is installed on the crossbeam at the top of the bellows, the upper cover is arranged on the base, and the upper cover and the base are nested structures; the upper cover and the base are movably connected by the positioning bolts, the support spring is arranged between the upper cover and the base, and the sealing filler is filled between the upper cover and the base; the rotating shaft seat is arranged on the upper cover.

[0017] It can be seen from the above technical scheme that the sealing device of the present invention adopts a support plate connected to a sealing plate, and the support plate is rotatably arranged in the rotating shaft seat. On the one hand, the contact area between the support plate and the inner wall of the rotating shaft seat is smaller, and the friction force is small. The support plate can be driven to rotate in the rotating shaft seat with a smaller force, and the rotation is more flexible, and the shaft is not easily stuck, thereby ensuring the contact between the sealing plate and the bottom beam of the trolley and ensuring the sealing effect; on the other hand, the support plate can also be used as a wind shield, which is arranged in the rotating shaft seat. Under the action of the gravity of the sealing plate, the bottom of the support plate is always in contact with the inner wall of the rotating shaft seat, which can prevent the airflow from circulating on both sides of the support plate. While playing a role of rotation connection, it can also play a role of sealing. In the preferred scheme, the connection position of the support plate and the sealing plate is not at the center of the width of the sealing plate, so that the front of the sealing plate is longer than the rear. The sealing plate's own weight and the non-central fulcrum setting are used to make the sealing plate automatically maintain a low front and high back state before it comes into contact with the trolley under the action of its own gravity and the automatic downward pressure generated by the wind pressure entering the bottom of the trolley from the material surface, so as to facilitate the movement of the trolley onto the plate. In addition, the rotation state of the sealing plate can be automatically adjusted during the movement of the trolley to keep the sealing plate and the bottom of the trolley in good contact at all times, thereby ensuring the sealing effect between the bottom of the trolley and the sealing plate. At the same time, there is no need to additionally set counterweights, springs and other components, thereby reducing the number of parts, simplifying the structure and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 It is a partial enlarged schematic diagram of the sealing plate, the supporting plate and the rotating shaft seat of the embodiment of the present invention;

[0021] Figure 3 This is a schematic structural diagram of a sealing plate and a supporting plate according to an embodiment of the present invention;

[0022] Figure 4 This is a structural schematic diagram of the sealing plate and the supporting plate at another angle according to an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the rotating shaft seat and the reinforcing ribs;

[0024] Figure 6 It is a structural schematic diagram of another embodiment of the auxiliary supporting part of the present invention;

[0025] Figure 7 It is a structural schematic diagram of another embodiment of the auxiliary supporting part of the present invention;

[0026] Figure 8 This is a structural schematic diagram of a support plate without auxiliary support parts. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings. When describing the embodiments of the present invention in detail, for the convenience of explanation, the drawings representing the device structure will not be partially enlarged according to the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. It should be noted that all the drawings are drawn in a simplified form and in an inaccurate proportion, and are only used to facilitate and clearly assist in explaining the embodiments of the present invention. At the same time, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "positive", "negative", "bottom", "upper", "lower", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0028] like Figure 1 and Figure 2 As shown, the sintering machine sealing device of the present invention includes a sealing plate 1, a support plate 2, a rotating shaft seat 3 and a spring adjustment assembly 4. The sealing plate 1 is made of wear-resistant material, such as a wear-resistant plate such as stainless steel or alloy. The top surface of the sealing plate 1 is in contact with the bottom of the trolley beam 100 (the bottom of the trolley). The length of the sealing plate 1 is equal to the width of the trolley (the width direction of the trolley is perpendicular to the traveling direction of the trolley), so that when the sealing plate 1 is in contact with the bottom of the trolley beam 100, sealing can be achieved over the entire width of the trolley. For the sake of ease of description, the sealing plate 1 in the traveling direction of the trolley ( Figure 1 The side facing the trolley in the direction indicated by the middle arrow is defined as the front side of the sealing plate 1, and the other side is the rear side of the sealing plate 1, that is, when the trolley passes through the sealing plate 1 in the process of moving forward, it will first pass through the front part of the sealing plate 1 and then pass through the rear part of the sealing plate 1.

[0029] Combination Figure 3 and Figure 4As shown, the support plate 2 is arranged below the sealing plate 1, and the support plate 2 can be connected to the sealing plate 1 by welding or threaded fasteners. The support plate 2 extends along the length direction of the sealing plate 1, and the total length of the support plate 2 and the sealing plate 1 are equal, that is, if there are multiple sealing plates forming a sealing plate of a sealing device, the length of the support plate 2 is equal to the sum of the lengths of all the sealing plates, and if the sealing plate is a whole piece, the length of the support plate 2 is equal to the length of the single sealing plate. The connection position between the support plate 2 and the sealing plate 1 is not at the center of the width of the sealing plate 1. That is, the sealing plate 1 is divided into a front part 1a and a rear part 1b by the connection position between the support plate 2 and the sealing plate 1, and the length L1 of the front part 1a is greater than the length L2 of the rear part 1b. When the length of the front part 1a of the sealing plate 1 is greater than the length of the rear part 1b thereof, there is a weight difference between the front part 1a and the rear part 1b of the sealing plate 1, so that when the sealing plate 1 is not in contact with the trolley, the front part is automatically kept lower than the rear part. In other embodiments, the front portion 1a of the sealing plate 1 can also be made lower than the rear portion 1b by providing components such as a counterweight block and a spring. However, in this embodiment, the sealing plate is divided into a front portion and a rear portion of unequal lengths by the support plate 2. The weight of the sealing plate itself can be used to achieve that the front portion is lower than the rear portion under normal conditions without the need to provide other additional components, thereby simplifying the structure and assembly process of the sealing device and reducing costs.

[0030] Optionally, auxiliary support parts 2a are respectively provided on the front and rear surfaces of the support plate 2, and the intersection of the axis of the auxiliary support part 2a and the axis of the support plate 2 is a set circle ( Figure 4 The center of the circle is the circle shown by the dotted line in the middle. The set circumference is a virtual circle. The support plate 2 and the auxiliary support part 2a are both arranged along the radial direction of the set circumference, that is, the axis of the support plate 2 and the axis of the auxiliary support part 2a are in the radial direction of the set circumference. In this embodiment, the axis of the auxiliary support part 2a is perpendicular to the axis of the support plate 2. The number of auxiliary support parts 2a can be one or more, and they can be symmetrically arranged on both sides of the support plate 2, or they can be asymmetrically arranged, such as Figure 6 , the auxiliary support portion 2a may not be perpendicular to the support plate 2, such as Figure 7 In addition, the auxiliary support part may not be provided, such as Figure 8 However, the auxiliary support part 2a can provide support to the support plate 2 during its rotation, making the rotation more stable, and can also play a role in supporting the sealing filling material. Moreover, compared with not providing an auxiliary support part, the end of the auxiliary support part must be in contact with the inner wall of the shaft seat, and it itself also has a certain sealing effect, so there is no need to fill too much sealing filling material in the shaft seat, which can reduce the resistance to the rotation of the support plate and ensure the flexibility of rotation. Providing a pair of auxiliary support parts symmetrically arranged on both sides of the support plate will not increase too much friction, maintain the flexibility of rotation, and is also conducive to ensuring the stability of the support plate rotation.

[0031] like Figure 1 and Figure 2 As shown, the support plate 2 can be rotatably arranged around its own axis in the shaft seat 3, and the support plate 2 and the shaft seat 3 are of equal length. The shaft seat 3 is an arc-shaped hollow tube, and the upper part of the shaft seat 3 is open, so that the upper part of the support plate 2 can extend from the opening of the shaft seat 3 and be connected to the sealing plate 1. The support plate 2 can be directly connected to the sealing plate 1, or indirectly connected to the sealing plate 1 through a bottom plate (unnumbered) connected to the sealing plate. The center of the arc (vertical cross-sectional shape) of the shaft seat 3 coincides with the center of the set circle, that is, when the support plate 2 is installed in the shaft seat 3, the axis of the support plate 2 and the auxiliary support portion 2a are in the radial direction of the shaft seat 3. The support plate 2 connected to the sealing plate 1 can play the role of supporting the rotating shaft, so that the sealing plate 1 can rotate with the bottom of the support plate 2 as the rotation center. Before the trolley is in contact with the sealing plate 1, the height of the front part of the sealing plate 1 is lower than the height of the rear part, that is, the front end of the sealing plate is lower than the rear end. When the trolley is in contact with the sealing plate 1, under the action of the gravity of the trolley, the sealing plate 1 is supported by the support plate 2, and at the same time, it will rotate with the contact point between the support plate 2 and the rotating shaft seat 3 as the fulcrum to adapt to the position change of the trolley and maintain contact with the bottom beam of the trolley.

[0032] The axis of the support plate 2 of this embodiment is perpendicular to the axis of the auxiliary support part 2a. In addition to supporting the rotation, the auxiliary support part 2a also supports the sealing filling material 5. The space above the auxiliary support part 2a in the rotating shaft seat 2 is filled with the sealing filling material 5. The sealing filling material 5 can prevent the airflow from entering the rotating shaft seat 3, thereby preventing the air leakage between the support plate 2 and the rotating shaft seat 3. The sealing filling material 5 can be made of graphite packing or conventional high-temperature resistant sealing materials such as rubber. In order to make the rotation of the support plate 2 in the rotating shaft seat 3 smoother, the bottom of the support plate 2 is an arc surface, and the end of the auxiliary support part 2a is also an arc surface, such as a circular arc surface, so that it can cooperate with the inner circumferential surface of the rotating shaft seat 3 to rotate. The rotation range of the support plate 2 can be limited by controlling the size of the upper opening 3a of the rotating shaft seat 3, thereby controlling the rotation range of the sealing plate 1, such as limiting the rotation of the sealing plate within the range of 5 to 30°, and the size of the opening can be set accordingly according to actual needs.

[0033] As a preferred embodiment of the present invention, the rotating shaft seat 3 is arranged on the spring adjustment component 4. The elastic adjustment component 4 of this embodiment includes a base 4-1, an upper cover 4-2, a support spring 4-3, a positioning bolt 4-4 and a sealing filler 4-5. The base 4-1 is installed on the beam at the top of the bellows, and the upper cover 4-2 is arranged on the base 4-1. The upper cover 4-2 has a side plate extending downward from the top plate. The side plate of the upper cover 4-2 and the base 4-1 are nested structures to form a box body. The upper cover 4-2 and the base 4-1 are movably connected by a positioning bolt 4-4. One end of the positioning bolt 4-4 is connected to the upper cover 4-2 and the other end is connected to the base 4-1. The upper cover 4-2 can have a certain amount of up and down displacement within the range limited by the positioning bolt 4-4. The support spring 4-3 is arranged between the upper cover 4-2 and the base 4-1, and the support spring 4-3 pushes the upper cover 4-2 upward. The support spring 4-3 of this embodiment is sleeved on the positioning bolt 4-4. The elastic force of the support spring 4-3 can adjust the height of the upper cover 4-2 within a certain range, thereby also providing the function of position adjustment for the sealing plate 1. When the trolley moves onto the sealing plate 1, the weight of the trolley itself will press down the sealing plate 1 and the upper cover 4-2 of the spring adjustment assembly 4, and the elastic force of the support spring 4 will push the upper cover 4-2 and the sealing plate 1 upward, so that the upper surface of the sealing plate 1 is in close contact with the bottom beam of the trolley to prevent air leakage. The sealing filler 4-5 is filled between the side plates of the upper cover 4-2 and the side plates of the base 4-1, so that the airflow cannot pass through the box composed of the base 4-1 and the upper cover 4-2, which is used to prevent wind from flowing in and out of the front and back of the elastic adjustment assembly.

[0034] like Figure 5 As shown, optionally, the shaft seat 3 is mounted on the upper cover 4-2 of the elastic adjustment component 4 through a reinforcing rib 6, and a plurality of reinforcing ribs 6 arranged at intervals can be provided to strengthen the connection between the shaft seat 3 and the upper cover 4-2. The shaft seat 3 and the upper cover 4-2 can also be welded.

[0035] The sealing device of the present invention can be combined in several pieces in the width direction of the sintering trolley to prevent air leakage and cross-flow from the bellows to the outside world in the width direction of the sintering trolley. It can also be installed between the sintering section and the cooling section in the middle of the sintering machine to be used for partition sealing in between to prevent air leakage and cross-flow between the sintering section and the cooling section.

[0036] The sealing device of the present invention adopts a support plate connected to a sealing plate. The support plate is rotatably arranged in a rotating shaft seat. Compared with the connection structure of a hinge shaft and a shaft sleeve, the contact area between the support plate and the inner wall of the rotating shaft seat is smaller, and the friction force is small. The support plate can be driven to rotate in the rotating shaft seat with a smaller force. The rotation is more flexible and the shaft is not easily stuck, thereby ensuring the contact between the sealing plate and the bottom beam of the trolley and guaranteeing the sealing effect.

[0037] It is true that the technical concept of the present invention is not limited to the above-mentioned embodiments, and many different specific schemes can be obtained based on the concept of the present invention. For example, in the above-mentioned embodiment, the shaft seat is arranged on the upper cover of the elastic adjustment component, but the shaft seat can also be directly arranged on the cross beam at the top of the bellows, that is, the elastic adjustment component is omitted. However, the setting of the elastic adjustment component can increase the adjustment amount for the upper cover and the sealing plate, and can better achieve the sealing between the sealing plate and the bottom of the trolley beam. Such changes and equivalent transformations should be included in the scope described in the claims.

Claims

1. A sealing device for a sintering machine, characterized in that: include: A sealing plate in contact with the bottom of the trolley; A support plate disposed below the sealing plate; A rotating shaft seat with an opening at the top, the rotating shaft seat is a hollow tube with an arc-shaped vertical cross section, the support plate is rotatably arranged in the rotating shaft seat, the upper part of the support plate extends from the opening of the rotating shaft seat and is connected to the sealing plate; Before the trolley comes into contact with the sealing plate, the front end of the sealing plate is lower than the rear end of the sealing plate.

2. The sintering machine sealing device according to claim 1, characterized in that: The connection position between the support plate and the sealing plate is not at the center of the width of the sealing plate. The sealing plate is divided into a front part and a rear part at the connection position between the support plate and the sealing plate, and the length of the front part is greater than the length of the rear part.

3. The sealing device for a sintering machine according to claim 1, characterized in that: The bottom surface of the support plate is a curved surface.

4. The sealing device for a sintering machine according to claim 1, characterized in that: The rotating shaft seat is provided with a sealing filling material for sealing the gap between the opening of the rotating shaft seat and the supporting plate.

5. The sealing device for a sintering machine according to claim 1, characterized in that: The support plate is provided with a secondary support portion, the intersection of the axis of the secondary support portion and the axis of the support plate is the center of the vertical cross-section of the shaft seat, and the end of the secondary support portion is in contact with the inner wall of the shaft seat.

6. The sealing device for a sintering machine according to claim 5, characterized in that: The auxiliary supporting parts are symmetrically arranged on both sides of the supporting plate.

7. The sealing device for a sintering machine according to claim 5, characterized in that: The space in the rotating shaft seat above the auxiliary supporting portion is filled with sealing filling material.

8. The sealing device for a sintering machine according to claim 5, characterized in that: The end of the auxiliary supporting portion is a curved surface.

9. The sealing device for a sintering machine according to claim 1, characterized in that: It also includes reinforcing ribs for fixing the rotating shaft seat.

10. The sealing device for a sintering machine according to claim 1, characterized in that: It also includes an elastic adjustment component, which includes a base, an upper cover, a support spring, a positioning bolt and a sealing filler; the base is installed on the crossbeam at the top of the bellows, the upper cover is arranged on the base, and the upper cover and the base are nested structures; the upper cover and the base are movably connected by the positioning bolts, the support spring is arranged between the upper cover and the base, and the sealing filler is filled between the upper cover and the base; the rotating shaft seat is arranged on the upper cover.

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