Sealing device based on fire grate driving beam

Abstract

The invention belongs to the technical field of waste incineration, and relates to a sealing device based on a fire grate driving beam, which is mounted on an ash bucket wall, is used for movably sealing the driving beam, and comprises a base box, a supporting block, a sealing assembly and a sealing sleeve, the base box is detachably and fixedly connected to the ash bucket wall and is arranged on the inner side of an ash bucket, and the supporting block is arranged on the base box; a hole for the driving beam to penetrate through is formed in the base; the supporting block is fixedly connected to the base box and arranged on the side, away from the ash bucket, of the base box, a clamping groove used for containing the sealing assembly is formed in the supporting block, the sealing assembly is arranged on a driving beam in a sleeving mode and placed in the clamping groove, and the two ends of the sealing sleeve are connected with the sealing assembly and the base box respectively. Therefore, movable sealing of the driving beam is achieved. On the basis that a sealing fan is omitted, effective sealing and long-time stable operation of the driving beam and the ash bucket in front-back reciprocating operation are achieved, and the sealing effect and the operation quality are ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste incineration and relates to a sealing device based on a grate drive beam. Background Art

[0002] In recent years, encouraged by the national industrial policies for the reduction, harmless treatment and resource utilization of domestic waste, the waste incineration industry in China has entered a period of rapid development. Large and medium-sized cities have successively built new waste incineration plants, and the level of harmless treatment and resource utilization of waste has become higher and higher. The incinerator is the core equipment of the waste incineration process, realizing the whole process of waste feeding, incineration and slag discharging. The stable and reliable operation of the equipment is an effective guarantee for the overall operation. The grate is a device for realizing the drying, combustion and burnout of waste. The waste is conveyed and burned on the grate bars, which are the core components moving reciprocally. The reciprocating movement of the grate bars is driven by a drive beam in a high-temperature hopper below, and the drive beam passes through the hopper and is connected to an external hydraulic device. The stable and reliable operation of the drive beam is an important guarantee for the continuous operation of the grate. Among them, the effective sealing of the drive beam passing through the high-temperature hopper is the key point and difficulty to achieve reliable operation.

[0003] Since the high-temperature hopper under the grate is a device for supplying combustion air to the furnace and also a collection device for the leakage of ash and slag from the grate, the drive beam passes through the wall surface of the hopper and makes continuous movement. During the operation, the drive beam may also swing to a certain extent, which requires a high sealing requirement for the perforation position of the hopper, and leakage is very likely to occur. This will cause the high-temperature air in the hopper and the leakage of ash and slag from the grate to leak to the outside, seriously affecting the surrounding environment and operation quality. The existing application designs generally install a metal seal cover with an internal seal ring at the position where the drive beam passes through the wall surface, and at the same time, introduce a sealing air for long-term operation into the seal cover to prevent the overflow of the primary air in the hopper. Since the demand for the sealing air volume is large, a separate sealing fan needs to be set. This scheme is theoretically feasible. However, as the operation time progresses, the technical seal ring will show wear, resulting in the reduction of its sealing effect. At the same time, since a sealing fan for long-term operation needs to be set for the sealing air, this will require certain equipment costs and operation costs, and also increase the work and costs of maintenance and repair.

[0004] In summary, the research on new sealing solutions and the cancellation of the setting of the sealing fan is the focus of attention and innovation in the industry, which is beneficial to improving the operation quality of waste incineration, reducing the operation cost and promoting the healthy development of the industry. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a sealing device based on a grate drive beam, which can achieve the effective sealing between the drive beam and the hopper during the forward and backward reciprocating operation and long-term stable operation on the basis of canceling the sealing fan, and ensure the sealing effect and operation quality.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A sealing device based on a grate drive beam, which is installed on the hopper wall for the movable seal of the drive beam, includes a base box, a support block, a sealing assembly and a sealing sleeve. The base box is detachably and fixedly connected to the hopper wall and is arranged inside the hopper, and is provided with a hole for the drive beam to pass through;

[0008] The support block is fixedly connected to the base box and is arranged on the side of the base box away from the hopper. A clamping groove for placing the sealing assembly is provided thereon. The sealing assembly is sleeved on the drive beam and placed in the clamping groove. Both ends of the sealing sleeve are respectively connected to the sealing assembly and the base box to achieve the movable seal of the drive beam;

[0009] The base box is a box structure that is hollow and has a cover plate at the right end face. A hole for the drive beam to pass through is provided in the middle of the cover plate, and the left end face of the base box is an open structure and is fixedly connected to the opening of the hopper wall so that the drive beam passes through the hopper wall and the base box;

[0010] The sealing assembly includes a support ring, a first sealing ring, a spacing ring, a second sealing ring and a pressing plate. The first sealing ring, the spacing ring and the second sealing ring are sequentially placed inside the support ring from the inside. The pressing plate is connected to the support ring by bolts and is arranged outside the second sealing ring to install the first sealing ring, the spacing ring and the second sealing ring inside the support ring.

[0011] Further, the clamping groove is arranged along the axial direction of the drive beam, and the axial width of the sealing assembly is smaller than the axial width of the clamping groove, so as to limit the axial displacement of the sealing assembly while enabling the sealing assembly to have a certain activity space in the clamping groove.

[0012] Further, the cover plate is perpendicular to the drive beam.

[0013] Further, the materials of the first sealing ring and the second sealing ring are polytetrafluoroethylene and ammonium polyacrylate respectively.

[0014] Further, the sealing sleeve is a high-temperature resistant flexible polytetrafluoroethylene cloth.

[0015] Further, the inner hole sizes of the support ring, the spacing ring and the pressing plate are larger than the outer diameter of the drive beam, and the inner hole sizes of the first sealing ring and the second sealing ring match the outer diameter of the drive beam to form an interference fit.

[0016] Further, an annular cavity surrounding the drive beam is formed between the first sealing ring and the second sealing ring through the cooperation of the first sealing ring and the second sealing ring with the spacing ring;

[0017] An air inlet through-hole is provided on the support ring. An annular groove communicating with the air inlet through-hole is arranged on the outer circle of one side of the distance ring, and a plurality of radial through-channels facing the axis and communicating the annular groove with the inner cavity of the distance ring are arranged on the same side of the distance ring and the annular groove, so that the air inlet through-hole communicates with the annular cavity inside the distance ring.

[0018] Further, a secondary air is connected to one end of the air inlet through-hole away from the annular groove.

[0019] Further, an oil nozzle is connected to one end of the air inlet through-hole away from the annular groove to inject high-temperature lubricating grease into it.

[0020] Further, the base box, the support ring, the first sealing ring, the distance ring, the second sealing ring and the pressing plate all adopt a left-right symmetric form with a middle break, which is convenient for on-site installation, and thus realizes on-line replacement and maintenance without removing the driving beam, meeting the operation and maintenance requirements.

[0021] The beneficial effects of the present invention are as follows:

[0022] A sealing device based on a grate driving beam provided by the present invention proposes an innovative solution to the sealing problem of the driving beam passing through the high-temperature hopper in a waste incinerator. The device not only ensures the effective sealing of the driving beam and the hopper during reciprocating operation, but also realizes long-term stable operation, greatly improving the operation quality and environmental benefits of waste incineration.

[0023] First of all, through a clever design, the sealing device organically combines components such as the base box, the support block, the sealing component and the sealing sleeve to form a complete and efficient sealing system. The base box is detachably fixed on the hopper wall and is provided with a hole for the driving beam to pass through, which is convenient for installation and maintenance. The sealing component is sleeved on the driving beam and is connected to the base box through a flexible sealing sleeve. The sealing component is placed by the bottom-bearing support block to form an axial limit. This design enables the sealing component to flexibly adjust with the fluctuation of the driving beam, avoiding additional stress and wear, thus ensuring the stability and durability of the seal.

[0024] Secondly, the innovation of the device also lies in the material selection and structural design of its sealing component; the use of a double-layer non-metallic sealing ring not only meets the requirements of high temperature resistance, anti-corrosion and wear resistance, but also has a close contact with the driving beam, forming a good sealing effect. At the same time, the inner hole size of the sealing ring matches the outer diameter of the driving beam to form an interference fit, further improving the reliability and life of the seal; in addition, the base box adopts a symmetric break design, making on-line inspection and replacement more convenient and fast, greatly reducing the maintenance cost and time.

[0025] Finally, this sealing device also eliminates the configuration of traditional sealing air and the corresponding fan design, and adopts a clever air inlet channel design and an annular cavity. As a result, it can utilize a small amount of existing secondary air to form a small-volume air curtain, and combines with a double-layer sealing ring structure to achieve the sealing between the drive beam and the hopper. This innovative measure not only simplifies the system structure, reduces the equipment cost, but also reduces the operation and maintenance and energy consumption of the sealing fan, thus saving the operation cost. This breakthrough design gives the sealing device of the present invention a significant leading advantage in the waste incineration industry and provides strong technical support for the healthy development of the industry.

[0026] In summary, a sealing device based on a grate drive beam in the present invention demonstrates its leading position and practical value in the waste incineration industry with its innovative design, efficient sealing effect, stable operating performance, and significant cost-saving advantages.

[0027] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0029] Figure 1 is a schematic structural diagram of a sealing device based on a grate drive beam in Embodiment 1;

[0030] Figure 2 is a schematic structural diagram of the sealing assembly in Embodiment 1;

[0031] Figure 3 is Figure 2 the A-A cross-sectional view of

[0032] Figure 4 is a schematic plan view of the base in Embodiment 1;

[0033] Figure 5 is a schematic structural diagram of the support block in Embodiment 1;

[0034] Figure 6 is a schematic structural diagram of a sealing device based on a grate drive beam in Embodiment 2;

[0035] Figure 7 is a schematic structural diagram of the support ring in Embodiment 2;

[0036] Figure 8Schematic structural diagram of the fixed-distance ring in Embodiment 2.

[0037] Reference numerals: hopper wall 1, base 2, cover plate 21, support block 3, card slot 31, sealing assembly 4, support ring 41, air inlet through hole 411, pressing plate 42, first sealing ring 43, fixed-distance ring 44, annular groove 441, radial through groove 442, second sealing ring 45, sealing sleeve 5, driving beam 6. Detailed implementation manners

[0038] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0039] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and cannot be understood as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0040] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] Please refer to Figures 1 to 5 , a sealing device based on a grate driving beam, installed on the hopper wall 1 for the movable sealing of the driving beam 6, including a base box 2, a support block 3, a sealing assembly 4, and a sealing sleeve 5. The base box 2 is detachably and fixedly connected to the hopper wall 1 and is arranged inside the hopper, and is provided with a hole for the driving beam 6 to pass through;

[0042] The 4 sets of the sealing assemblies are sleeved on the driving beam 6 and arranged on the side of the base box 2 away from the ash hopper (near the outside of the ash hopper). The two ends of the sealing sleeve 5 are respectively connected to the sealing assembly 4 and the base box 2, so as to realize the movable sealing of the driving beam 6 through the cooperation of the sealing assembly 4, the sealing sleeve 5 and the base box 2.

[0043] The support block 3 is fixedly connected to the base box 2 and arranged on the side of the base box 2 away from the ash hopper. A clamping groove 31 for placing the sealing assembly 4 is provided thereon, and the clamping groove 31 is arranged along the reciprocating direction (i.e., the axial direction) of the driving beam 6. The axial width of the sealing assembly 4 is 10-15 mm smaller than the axial width dimension of the clamping groove 31, so as to limit the axial displacement of the sealing assembly 4 while enabling the sealing assembly 4 to have a certain movable space in the clamping groove 31. The depth of the clamping groove 31 is adaptively set according to the size of the sealing assembly 4 to ensure that the sealing assembly 4 does not fall out of the clamping groove 31.

[0044] Specifically, the base box 2 adopts a box structure that is hollow and has a cover plate 21 on the upper end surface. A circular hole for the driving beam 6 to pass through is provided in the middle of the cover plate. The lower end of the box is an open structure, and an installation outer edge is reserved around the perimeter, which is lapped on the ash hopper wall of the grate with an opening and is fixedly connected to the ash hopper wall 1 by bolts, and the cover plate 21 is perpendicular to the driving beam 6 and forms a certain angle with the lower end surface (adaptively set according to the angle of the ash hopper wall).

[0045] Furthermore, the base box 2 adopts a left-right symmetric form that is split in the middle to facilitate installation on the driving beam 6. After installation, the butt joint is welded and sealed.

[0046] In another embodiment, the hole in the middle of the cover plate can be set to a corresponding hole shape according to the shape of the driving beam 6, such as a square shape, etc.

[0047] The sealing assembly 4 includes a support ring 41, a first sealing ring 43, a spacing ring 44, a second sealing ring 45 and a pressing plate 42. The first sealing ring 43, the spacing ring 44 and the second sealing ring 45 are sequentially placed in the support ring 41 from bottom to top and are pressed by the pressing plate 42; the pressing plate 42 and the support ring 41 are connected by bolts to install the first sealing ring 43, the spacing ring 44 and the second sealing ring 45 in the support ring 41.

[0048] Specifically, the whole sealing assembly 4 is installed in the base box 2 and is supported (placed) in the clamping groove 31 of the support block 3 on the inner side and below of the base box in a movable connection manner. The support block 3 is welded to the side of the cover plate 21 in the base box 2 away from the ash hopper. The sealing assembly can move left and right within a certain range in the clamping groove 31, and the driving beam passes through the center of the sealing assembly 4;

[0049] The sealing assembly includes multiple overlapping mounting components that are circular, hollow, split in the middle, and symmetrically arranged left and right. From the inside to the outside (from the inside of the hopper to the outside of the hopper), they are the support ring 41, the first sealing ring 43, the spacing ring 44, the second sealing ring 45, and the pressing plate 42 in sequence. The pressing plate and the support ring are fastened by bolts. The first sealing ring 43, the spacing ring 44, and the second sealing ring 45 are sequentially fixed in the inner cavity of the support ring by the pressing plate. The circumferential boss at one end of the support ring 41 close to the base box 2 is connected to the circumferential boss inside the upper end cover of the base box through a sealing sleeve 5 made of high-temperature resistant flexible PTFE cloth, realizing the connection and sealing between the sealing assembly 4 and the base box 2;

[0050] The sealing sleeve 5 can be installed by sleeving it as a whole from the end of the driving beam, or it can be installed outside the driving beam after being split and then formed by high-temperature bonding. Except for the sealing sleeve 5 and the sealing ring, other components are made of metal.

[0051] Further, annular grooves are provided on the circumferential boss at one end of the support ring 41 close to the base box 2 and on the circumferential boss inside the upper end cover of the base box to cooperate with snap rings or clamps to fix the sealing sleeve 5.

[0052] Further, the inner hole sizes of the support ring 41 and the pressing plate 42 are larger than the outer diameter of the driving beam 6 and do not contact the driving beam 6. Two layers of circular sealing rings are installed at intervals in the groove of the support ring 41 through the spacing ring 44. The two sealing rings are respectively made of 5 mm thick polytetrafluoroethylene and ammonium polyacrylate with a certain hardness, or both are made of polytetrafluoroethylene, or both are made of ammonium polyacrylate. The inner hole sizes of the first sealing ring 43 and the second sealing ring 45 are the same as or slightly larger than the outer diameter of the driving beam 6, forming an interference fit and meeting the requirement that there is no friction between them, that is, the two layers of sealing rings keep in overall contact with the outer side surface of the driving beam, realizing double-layer effective sealing.

[0053] The sealing assembly 4 and the base box form a flexible connection through the sealing sleeve 5, and through the movable limit with the support block 3, the sealing assembly 4 can fluctuate within a small range together with the driving beam 6 during operation without wear and other damage. The sealing ring has a certain softness, good sealing performance, and at the same time has good high-temperature resistance, anti-corrosion, and wear resistance, and a long service life.

[0054] The driving beam 6 passes through the hopper through the cover plate 21 of the base box 2, and the driving beam is kept isolated and sealed inside and outside the hopper during the reciprocating operation back and forth through the sealing assembly 2. After running for a certain period, the sealing assembly 4 can be replaced online without disassembling the base box 2, making maintenance more convenient.

[0055] Specifically, the base box 2, the support ring 41, the first sealing ring 43, the distance ring 44, the second sealing ring 45, and the pressing plate 42 are all in a left-right symmetrical form with a middle break, facilitating on-site installation, enabling online replacement and maintenance without removing the driving beam, and meeting the operation and maintenance requirements.

[0056] Embodiment 2

[0057] Please refer to Figures 6 to 8 , the difference between this embodiment and Embodiment 1 is that in this embodiment, the first sealing ring 43 and the second sealing ring 45 cooperate with the distance ring 44 to form an annular cavity surrounding the driving beam 6 between the first sealing ring 43 and the second sealing ring 45. An air inlet through hole 411 is provided on the support ring 41, an annular groove 441 communicating with the air inlet through hole 411 is arranged on the outer circle of one side of the distance ring 44, and a plurality of radial through grooves 442 facing the axis and communicating the annular groove 441 and the inner cavity of the distance ring are provided on the same side of the distance ring 44 and the annular groove 441, so that the air inlet through hole 411 communicates with the annular cavity inside the distance ring.

[0058] Specifically, a secondary air branch pipeline is led out from the combustion-supporting secondary air of the incinerator and connected to one end of the air inlet through hole 411 away from the annular groove 441, so as to use the secondary air with a certain pressure as the sealing air. The secondary air enters the annular groove 441 outside the distance ring through the air inlet through hole 411 of the support ring 41, and then enters the annular cavity near the driving beam inside the distance ring through the plurality of radial through grooves 442 of the distance ring, and then forms a sealing air curtain around the driving beam to prevent the primary air in the ash hopper from leaking to the outside of the ash hopper through the small gap between the first sealing ring 43 and the driving beam 6, further ensuring the seal between the driving beam and the ash hopper.

[0059] Since the gap between the first sealing ring 43 and the second sealing ring 45 and the driving beam is very small, and the volume of the annular cavity between the distance ring 44 and the driving beam is also relatively small, and the air volume required to form a sealing air curtain in the annular cavity is also less, a separate sealing fan does not need to be set, and a little air volume can be separated from the surplus secondary air of the existing incinerator to meet the requirements. And since the separated secondary air is less, the existing secondary air does not need to be redesigned and improved.

[0060] Specifically, taking an incinerator with a processing capacity of 600 tons / day as an example, the parameters of its primary and secondary air are as shown in Table 1 below:

[0061] Table 1

[0062] Fan Fan Design air volume Design pressure Unit <![CDATA[Nm 3 / h]]> Pa Primary fan Primary air 70000 4200 Secondary fan Secondary air 37000 5200 Seal fan Seal air 6000 7000

[0063] Among them, the primary air enters the ash hopper under the grate and then is blown into the furnace through the air holes of the grate plates at the upper part of the ash hopper to achieve combustion support; the sealing device is to prevent the leakage of the primary air with temperature and pressure in the ash hopper through the reciprocating movement of the driving beam through the ash hopper wall.

[0064] Among them, the secondary air is blown into the furnace through the air nozzles around the upper outlet of the furnace to achieve the disturbance of the flue gas and promote the complete combustion of the flue gas.

[0065] Since the existing sealing device requires a large amount of air volume and air pressure and the parameters do not match, it is necessary to set up a separate sealing fan to supply air.

[0066] In this embodiment, the volume of the annular cavity forming the sealing air curtain around the driving beam is very small, and only a small amount of air volume can meet the requirements. Taking an incinerator with a processing capacity of 600 tons per day as an example, the diameter of the air inlet through hole 411 of the support ring 41 can be selected as 2 mm, the cross section of the annular groove 441 on the outer circle of the spacing ring can be selected as a square with a side length of 2 mm, and 4 radial through grooves 442 with a cross section of 4 mm * 2 mm facing the axis are evenly distributed along the circumferential direction. And between the first sealing ring 43 and the second sealing ring 45, the height of the annular cavity inside the spacing ring can be selected as 3 mm. The thickness of the first sealing ring 43 and the second sealing ring 45 can be selected as 5 mm, and the thickness of the spacing ring 44 can be selected as 7 mm. It only needs 300 Nm 3 / h and 5000 Pa of air to meet the sealing requirements, and a little surplus air can be directly separated from the secondary air. Therefore, there is no need to set up a separate fan, and it will not affect the normal use of the secondary air.

[0067] Embodiment 3

[0068] The difference between this embodiment and Embodiment 2 is that in this embodiment, the air inlet through hole of the support ring 41 is not ventilated, but an oil nozzle is connected to the end of the air inlet 411 through hole far away from the annular groove, and high-temperature lubricating grease is regularly added into the air inlet through hole through the oil nozzle, so that the annular cavity between the spacing ring 44 and the driving beam is filled with high-temperature lubricating grease, and the high-temperature lubricating grease in a semi-solid state is used to isolate the inside and outside of the ash hopper to achieve the sealing of the movement gap of the driving beam.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A sealing device based on a grate driving beam, installed on the wall of the ash hopper, used for the movable sealing of the driving beam, characterized in that: It includes a base box, a support block, a sealing assembly and a sealing sleeve. The base box is detachably fixedly connected to the wall of the ash hopper and arranged inside the ash hopper. A hole is provided on the base box for the driving beam to pass through. The support block is fixedly connected to the base box and arranged on a side of the base box away from the ash hopper. A slot for placing a sealing component is provided on the support block. The sealing component is sleeved on the driving beam and placed in the slot. The two ends of the sealing sleeve are respectively connected to the sealing component and the base box to achieve active sealing of the driving beam. The base box is a hollow box structure with a cover plate on the right end face, a hole is arranged in the middle of the cover plate for the driving beam to pass through, and the left end face of the base box is an open structure and is fixedly connected to the opening of the ash hopper wall so that the driving beam passes through the ash hopper wall and the base box; The sealing assembly includes a support ring, a first sealing ring, a distance ring, a second sealing ring and a pressure plate. The first sealing ring, the distance ring and the second sealing ring are placed in the support ring from the inside to the outside. The pressure plate is connected to the support ring by bolts and is arranged on the outside of the second sealing ring to install the first sealing ring, the distance ring and the second sealing ring in the support ring.

2. The sealing device based on the grate driving beam according to claim 1, characterized in that: The slot is arranged along the axial direction of the driving beam, and the axial width of the sealing assembly is smaller than the axial width of the slot, so that the sealing assembly has a certain movable space in the slot while limiting the axial displacement of the sealing assembly.

3. The sealing device based on the grate driving beam according to claim 1, characterized in that: The cover plate is perpendicular to the driving beam.

4. The sealing device based on the grate driving beam according to claim 1, characterized in that: The materials of the first sealing ring and the second sealing ring are polytetrafluoroethylene and polyammonium propionate respectively.

5. The sealing device based on the grate driving beam according to claim 1, characterized in that: The sealing sleeve is made of high temperature resistant flexible polytetrafluoroethylene cloth.

6. The sealing device based on the grate driving beam according to claim 1, characterized in that: The inner hole sizes of the support ring and the pressure plate are larger than the outer diameter of the driving beam, and the inner hole sizes of the first sealing ring and the second sealing ring are the same and match the outer diameter of the driving beam to form a transition fit.

7. The sealing device based on the grate driving beam according to claim 6, characterized in that: An annular cavity surrounding the driving beam is formed between the first sealing ring and the second sealing ring by cooperating with the first sealing ring and the second sealing ring and the distance ring; An air inlet hole is provided on the support ring, an annular groove connected to the air inlet hole is provided on the outer circle of one side of the distance ring, and a plurality of radial grooves facing the axis and connecting the annular groove and the inner cavity of the distance ring are provided on the same side of the distance ring and the annular groove, so that the air inlet hole is connected to the annular cavity inside the distance ring.

8. The sealing device based on the grate driving beam according to claim 7, characterized in that: One end of the air inlet through hole away from the annular groove is connected to the secondary air.

9. The sealing device based on the grate driving beam according to claim 7, characterized in that: An end of the air inlet through hole away from the annular groove is connected with an oil nozzle to inject high-temperature lubricating grease therein.

10. The sealing device based on the grate driving beam according to claim 1, characterized in that: The base box, the support ring, the first sealing ring, the distance ring, the second sealing ring and the pressure plate are all in a left-right symmetrical form with a middle break, so as to facilitate on-site installation.

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