A coal feeding device

Abstract

The present invention relates to a coal feeding device, comprising a coal bunker, a coal hopper, and a coal drop pipe. The coal hopper is rotatably arranged relative to the coal bunker and the coal drop pipe, and the coal hopper rotates along its own axis. The lower part of the coal bunker extends into the upper part of the coal hopper. The device also comprises a sealing structure arranged between the lower part of the coal bunker and the upper part of the coal hopper, a support assembly arranged between the coal bunker and the upper part of the coal hopper, a drive assembly arranged between the coal drop pipe and the lower part of the coal hopper, and a scraper assembly arranged in the coal hopper. The scraper assembly comprises a plurality of scrapers, each of which has a connecting edge connected to the inner wall surface of the coal hopper, a scraper edge opposite to the connecting edge, and a blade surface connecting the connecting edge and the scraper edge. When the coal hopper rotates, the coal hopper drives the scrapers to rotate synchronously. The present invention reduces the heavy dredging work such as manually knocking on the coal bunker wall and digging coal, overcomes the problem that traditional coal hopper air cannon, vibrating device and other clearing methods cannot effectively clear blockages, enables the coal supply system to enter a normal working state, and smoothly discharges coal from the raw coal bunker, ensuring the safe operation of the power station boiler.

Description

Technical Field

[0001] The present invention relates to the field of coal-fired power plants, and in particular to a coal feeding device. Background Art

[0002] The coal hopper of a traditional raw coal bunker is prone to coal sticking together into blocks or coal arch structures due to factors such as the raw coal being damp and the coal blocks being too large, causing the raw coal to be blocked in the coal hopper. Clearing methods such as air cannons and vibrating devices are not very effective. Traditional rotary coal bunkers must operate continuously due to internal blade design issues, and the single blade design is not very effective when sticking or high-level arch blockages are severe. The only way to clear the blockage is by manual knocking on the bunker wall, digging out coal, and other heavy work. Manual clearing of blockages and clearing of coal drop pipes is very dangerous work, and the labor intensity of the workers is also very high. There are major safety hazards to the safe operation of the power plant. When clearing a blocked coal bunker, personal injury or death may occur if one is not careful. In the existing technology, it is very common for coal-fired boilers to burn municipal sludge, and the problem of coal hopper blockage is even more serious after sludge is mixed into the raw coal. There is an urgent need for a coal feeding device that can better solve the problem of coal blockage. Summary of the Invention

[0003] The object of the present invention is to provide a coal feeding device.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A coal feeding device includes a coal bunker, a coal hopper, and a coal drop pipe. The coal bunker is connected to the upper part of the coal hopper, and the coal drop pipe is connected to the lower part of the coal hopper. The coal bunker and the coal drop pipe are fixedly arranged, and the coal hopper is rotatable relative to the coal bunker and the coal drop pipe. The coal hopper rotates along its own axis, and the lower part of the coal bunker extends into the upper part of the coal hopper.

[0006] The coal feeding device further includes a sealing structure provided between the lower portion of the coal bunker and the upper portion of the coal hopper, a support assembly provided between the coal bunker and the upper portion of the coal hopper, a drive assembly provided between the coal drop pipe and the lower portion of the coal hopper, and a scraper assembly provided in the coal hopper.

[0007] The scraper assembly includes multiple scrapers, each of which has a connecting edge, a scraper edge opposite to the connecting edge, and a blade surface connecting the connecting edge and the scraper edge. The connecting edge is connected to the inner wall surface of the coal hopper. When the coal hopper rotates, the coal hopper drives the scraper to rotate synchronously.

[0008] Preferably, the length direction of the scraper extends spirally along the axis direction of the coal hopper.

[0009] Further preferably, the extension directions of the plurality of scrapers are the same.

[0010] Preferably, the lower ends of the plurality of scrapers are arranged in a circle.

[0011] Preferably, the blade surface forms an angle of 0-45° with the inner wall surface of the coal hopper.

[0012] Preferably, the thickness of the blade surface gradually decreases along the connecting edge toward the scraper edge.

[0013] Preferably, the upper end of the scraper extends into the coal bunker, and the upper end of the scraper has a notch that matches the shape of the portion of the coal bunker extending into the coal hopper.

[0014] Further preferably, the width of the scraper except the notch at the upper end thereof gradually narrows from top to bottom.

[0015] Further preferably, a V-shaped connecting portion is provided between the upper end of the connecting edge and the upper end of the scraper edge, and the V-shaped connecting portion forms the notch.

[0016] Further preferably, the surface of the side where the "V"-shaped connecting part is connected to the connecting edge is an arc, which minimizes the problem of raw coal accumulation. The side where the "V"-shaped connecting part is connected to the scraper edge fits with the inner wall surface of the coal bin, which can better scrape off the raw coal or coal dust attached to the lower part of the coal bin.

[0017] Preferably, the upper end of the scraper edge is an arc-shaped edge, and the connection between the upper end of the scraper edge and the blade surface is a rounded corner, which can balance the smoothness of coal falling when it is normally not blocked.

[0018] Preferably, the coal hopper has a frustum section connected to the coal bin, the scraper is arranged on the frustum section, and the lower end of the scraper extends to the lower end of the frustum section.

[0019] Further preferably, the diameter of the frustum segment gradually decreases from top to bottom.

[0020] Preferably, a plurality of scrapers are evenly distributed on the inner wall surface of the coal hopper.

[0021] Preferably, the sealing structure includes a first sealing portion formed by the lower part of the coal bin extending into the coal hopper, and a second sealing portion formed by the upper part of the coal hopper located outside the first sealing portion, and the first sealing portion and the second sealing portion cooperate to form a sealing area.

[0022] Further preferably, the sealing structure further comprises a sealing member, and the sealing member is arranged in the sealing area.

[0023] More preferably, the sealing member is made of rubber or wool felt.

[0024] Further preferably, the lower end of the first sealing portion forms a lower convex portion, the lower convex portion extends toward the side of the second sealing portion, and / or the upper end of the first sealing portion forms an upper convex portion, the upper convex portion extends toward the side of the second sealing portion, and / or the upper part of the coal hopper protrudes inwardly to form the second sealing portion.

[0025] More preferably, the diameter of the first sealing portion gradually decreases from top to bottom, the diameter of the second sealing portion gradually decreases from top to bottom, the coal bin and coal hopper are concentrically arranged, the maximum diameter of the lower convex portion is not greater than the minimum diameter of the second sealing portion, and the maximum diameter of the upper convex portion is not less than the maximum diameter of the second sealing portion.

[0026] Preferably, the coal feeding device further comprises a coal bunker support, and the coal bunker is arranged on the coal bunker support.

[0027] Preferably, the driving assembly drives the coal hopper to rotate, and the driving assembly includes a power source, a rack arranged on the outer periphery of the coal hopper, and a gear assembly connected to the power source, and the gear assembly includes at least three gears that are simultaneously engaged with the rack, and at least three of the gears are evenly distributed.

[0028] Further preferably, when there is only one power source, one of at least three gears is mounted on the output end of the power source; when there are multiple power sources, the number of power sources does not exceed the number of gears, and one gear is correspondingly provided for each power source.

[0029] Further preferably, the coal feeding device further comprises a fixing seat, the fixing seat is arranged on the outer peripheral surface of the coal drop pipe, and the power source and the gear are both arranged on the fixing seat.

[0030] More preferably, only one power source is provided on the fixing seat, and / or only one gear is provided via the rotating shaft.

[0031] Preferably, the support assembly includes a first support frame arranged on the coal bin, a second support frame arranged on the coal hopper, and a pulley assembly, and the pulley assembly includes at least three rotatable pulleys, at least three of the pulleys are evenly distributed, and at least three of the pulleys are arranged between the first support frame and the second support frame.

[0032] Further preferably, the pulley is arranged on the second support frame and simultaneously abuts against the side surface of the first support frame.

[0033] Further preferably, the first support frame is integrally provided with the coal bunker, and / or the second support frame is integrally provided with the coal hopper.

[0034] Preferably, the outer peripheral surface of the lower part of the coal hopper has a step surface, the lower part of the coal hopper is inserted into the upper end of the coal drop pipe, the step surface of the coal hopper is located on the upper end surface of the coal drop pipe, and an annular bearing is provided between the step surface of the coal hopper and the upper end surface of the coal drop pipe.

[0035] Preferably, the coal feeding device further includes a coal feeder, which is connected to the coal dropping pipe and is arranged below the coal dropping pipe.

[0036] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0037] The present invention reduces the heavy dredging work of manually knocking on the coal bunker wall and digging out coal, overcomes the problem that traditional coal hopper air cannon, vibration device and other blockage clearing methods cannot effectively clear the blockage, enables the coal supply system to enter a normal working state, and the raw coal bunker unloads coal smoothly, ensuring the safe operation of the power station boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Attachment Figure 1 Schematic diagram of the structure of the coal feeding device in this embodiment (partial cross-section around the coal hopper);

[0039] Attachment Figure 2 For attachment Figure 1 A magnified schematic diagram of part A;

[0040] Attachment Figure 3 For attachment Figure 2 An enlarged schematic diagram of part B;

[0041] Attachment Figure 4 For attachment Figure 2 A magnified schematic diagram of part C;

[0042] Attachment Figure 5 This is a detailed schematic diagram of the cooperation between the upper end of the scraper and the sealing structure in this embodiment;

[0043] Attachment Figure 6 This is a top view of the drive assembly (protective cover not shown) in this embodiment;

[0044] Attachment Figure 7 This is a top view of the drive assembly (protective cover shown) in this embodiment;

[0045] Attachment Figure 8This is a top view of the support assembly in this embodiment.

[0046] In the above drawings: 1. Coal bunker; 2. Coal hopper; 21. Step surface; 3. Coal drop pipe; 4. Coal feeder; 51. First sealing part; 511. Upper convex part; 512. Lower convex part; 52. Second sealing part; 53. Sealing element; 6. Scraper; 61. Connecting edge; 62. Scraper edge; 63. Blade; 64. "V"-shaped connecting part; 71. Power source; 72. Rack; 73. Gear; 74. Protective cover; 81. First support frame; 82. Second support frame; 83. Pulley; 91. Fixed seat; 92. Coal bunker bracket; 93. Annular bearing. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0050] like Figure 1 As shown, a coal feeding device includes a coal bunker 1, a coal hopper, a coal drop pipe 3, a coal feeder 4, a sealing structure, a support assembly, a drive assembly, a scraper assembly, a fixing base 91, and a coal bunker bracket 92. The coal feeding device is used to prevent and clear irregular particles or highly viscous solid fuel that forms a viscous or arched structure in the feeding device. It is particularly suitable for preventing blockage in the coal bunker 1 of coal-fired power plants.

[0051] like Figure 1 、 2 As shown, the coal bunker 1, coal hopper 2, and coal drop pipe 3 are concentrically and coaxially arranged. The coal bunker 1 is connected to the upper portion of the coal hopper 2, and the lower portion of the coal bunker 1 extends into the upper portion of the coal hopper 2. The coal drop pipe 3 is connected to the lower portion of the coal hopper 2, and the lower portion of the coal hopper 2 extends into the upper portion of the coal drop pipe 3. The coal feeder 4 is connected to the coal drop pipe 3 and is arranged at the lower portion of the coal drop pipe 3. The coal bunker 1 and the coal drop pipe 3 are fixedly arranged. The coal hopper 2 is rotatable relative to the coal bunker 1 and the coal drop pipe 3. Specifically, the coal hopper 2 can rotate along its own axis. The coal hopper 2 includes a conical section 21 and a cylindrical section 22. The conical section 21 is connected to the coal bunker 1, and the cylindrical section 22 is connected to the coal drop pipe 3. The diameter of the conical section 21 gradually decreases from top to bottom, and the diameter of the lower portion of the coal bunker 1 also gradually decreases from top to bottom.

[0052] like Figure 2 、 3 As shown, the sealing structure is arranged between the lower part of the coal bunker 1 and the upper part of the coal hopper 2, the supporting assembly is arranged between the coal bunker 1 and the upper part of the coal hopper 2, the driving assembly is arranged between the coal dropping pipe 3 and the lower part of the coal hopper 2 and drives the coal hopper 2 to rotate, the scraper assembly is arranged in the coal hopper 2, the fixing seat 91 is used to install the driving assembly and is arranged on the outer peripheral surface of the coal dropping pipe 3, the coal bunker 1 is arranged on the coal bunker bracket 92, and the coal bunker bracket 92 supports the coal bunker 1 to prevent it from excessively squeezing the coal hopper 2 and affecting the rotation of the coal hopper 2.

[0053] like Figure 3 As shown, the sealing structure includes a first sealing portion 51 formed by the portion of the lower portion of the coal bunker 1 extending into the coal hopper 2, a second sealing portion 52 formed on the upper portion of the coal hopper 2 located outside the first sealing portion 51, and a sealing member 53. The first sealing portion 51 and the second sealing portion 52 cooperate to form a sealing area. The sealing member 53 is arranged in the sealing area to reduce the internal coal dust from overflowing during operation, effectively solving the problem of energy consumption of traditional sealing wind, and facilitating energy conservation. The diameter of the first sealing portion 51 gradually decreases from top to bottom, consistent with the shape of the lower portion of the coal bunker 1; the diameter of the second sealing portion 52 gradually decreases from top to bottom, consistent with the shape of the upper portion of the coal hopper 2. The sealing member 53 is a wear-resistant soft sealing ring, and its material includes rubber, wool felt, etc.

[0054] The lower end of the first sealing portion 51 forms a lower protrusion 512, which extends toward the second sealing portion 52. The maximum diameter of the lower protrusion 512 is no greater than the minimum diameter of the second sealing portion 52, ensuring smooth docking during installation. The upper end of the first sealing portion 51 forms an upper protrusion 511, which extends toward the second sealing portion 52. The maximum diameter of the upper protrusion 511 is no less than the maximum diameter of the second sealing portion 52, thereby limiting the depth to which the coal bin 1 extends into the coal hopper 2. The upper portion of the coal hopper 2 protrudes inward to form the second sealing portion 52, which cooperates with the upper and lower protrusions 511, 512 of the first sealing portion 51 to form a sealing area, firmly embedding the sealing member 53 and preventing it from falling out.

[0055] The first sealing part 51 is integrated with the coal bunker 1, which is equivalent to extending outward in a circle at the lower part of the coal bunker 1. The second sealing part 52 is integrated with the coal hopper 2, which is equivalent to protruding inward in a circle at the upper part of the coal hopper 2. The large particles of raw coal are allowed to fall smoothly into the coal hopper 2 by gravity. The place where they fall is a little distance away from the joint between the coal bunker 1 and the coal hopper 2 to ensure that the raw coal will not accumulate at the joint.

[0056] like Figure 2 、 5 As shown, the scraper assembly includes multiple scrapers 6, each having a connecting edge 61, a scraper edge 62 opposite the connecting edge 61, and a blade surface 63 connecting the connecting edge 61 and the scraper edge 62. The connecting edge 61 is connected (in this embodiment, by welding) to the inner wall of the coal hopper 2. When the coal hopper 2 rotates, the coal hopper 2 drives the scrapers 6 to rotate synchronously. The coal hopper 2 drives the scraper assembly to periodically rotate forward and reverse, forcing the raw coal to fall into the coal drop pipe 3, achieving the purpose of completely breaking the arch and smoothing the discharge of the coal.

[0057] The scraper 6 is mounted on the conical section 21 of the coal hopper 2. The upper end of the scraper 6 extends into the coal bunker 1, while the lower end of the scraper 6 extends to the lower end of the conical section 21. The lower ends of the multiple scrapers 6 form a circular shape. The scrapers 6 are evenly distributed on the inner wall of the coal hopper 2, and each scraper 6 has the same shape and extension direction. In this embodiment, there are twelve scrapers 6 shown.

[0058] The scraper blade 6 extends longitudinally along the axis of the coal hopper 2. It spirals along the inner wall of the coal hopper 2, ensuring both strength and coal scraping efficiency. The blade surface 63 forms an angle of 0-45° with the inner wall of the coal hopper 2, and the thickness of the blade surface 63 gradually decreases from the connecting edge 61 toward the scraper edge 62.

[0059] The upper end of the scraping blade 6 has a notch that matches the shape of the part of the coal bunker 1 extending into the coal hopper 2. The width of the part of the scraping blade 6 other than the notch at its upper end gradually narrows from top to bottom. There is a "V"-shaped connecting part 64 between the upper end of the connecting edge 61 and the upper end of the scraping blade edge 62, and the "V"-shaped connecting part 64 forms the aforementioned notch. The surface of the side of the "V"-shaped connecting part 64 connected to the connecting edge 61 is an arc, and both sides of the arc surface are connected to both sides of the blade surface 63, minimizing the problem of raw coal accumulation to the greatest extent. The side of the "V"-shaped connecting part 64 connected to the scraping blade edge 62 is fitted to the inner wall surface of the coal bunker 1, which can better scrape off the raw coal or coal dust adhering to the lower part of the coal bunker 1. The upper end of the scraping blade edge 62 is an arc edge, and the connection between the upper end of the scraping blade edge 62 and the blade surface 63 is a rounded corner, which can balance the smoothness of coal dropping when there is no blockage.

[0060] As Figure 6 , 7 shown, the driving component includes a power source 71, a rack 72 arranged on the outer periphery of the coal hopper 2, and a gear component传动连接 with the power source 71. The gear component includes at least three gears 73 that mesh with the rack 72 at the same time, and at least three gears 73 are evenly distributed. The even distribution of multiple gears 73 can help limit the position of the coal hopper 2. Among them, the best distribution of three gears 73 is in a "pin" shape, and the support of three points is the most stable. The gears 73 tightly engage the rack 72, making the coal hopper 2, the coal bunker 1, and the coal dropping pipe 3 concentric, making the rotation more stable. A protective cover 74 is provided over the rack 72 and the gear 73 component to protect the rack 72 and the gear 73 component from being interfered by external objects and affecting normal operation, and at the same time ensure the safety of maintenance personnel.

[0061] The power source 71 is installed on the fixed seat 91. The power source 71 can adopt a combination of an integrated driving motor and a reducer. The power source 71 can drive the coal hopper 2 to rotate bidirectionally through transmission. When there is only one power source 71, one of the gears 73 in the gear component is sleeved on the output end of the power source 71; when there are multiple power sources 71, one gear 73 is correspondingly set for each power source 71, but the number of power sources 71 does not exceed the number of gears 73. The gear 73 connected to the power source 71 is arranged at the output end of the power source 71, and the gears 73 not connected to the power source 71 are all arranged on the fixed seat 91 through a rotating shaft. There is no more than one power source 71 installed on one fixed seat 91, and there is no more than one gear 73 installed on one fixed seat 91.

[0062] As Figure 8As shown in the figure, the support assembly includes a first support frame 81 provided on the coal bunker 1, a second support frame 82 provided on the coal hopper 2, and a pulley 83 assembly. The pulley 83 assembly includes at least three rotatable pulleys 83. The at least three pulleys 83 are evenly distributed. The at least three pulleys 83 are provided between the first support frame 81 and the second support frame 82. In this embodiment, the rotation center line of the pulley 83 extends in the up and down direction, which is equivalent to transferring the internal bearing to the outside, ensuring that the bearing is not stuck by internal coal dust, and changing the sliding friction between the coal bunker 1 and the coal hopper 2 into rolling friction. The uniform distribution of the multiple pulleys 83 can help limit the position of the coal hopper 2. Among them, the distribution of three pulleys 83 in a "pin" shape is the best, and the support of the three points is the most stable, making the coal hopper 2, the coal bunker 1, and the coal dropping pipe 3 on the same concentric circle, making the rotation more stable. The first support frame 81 is an annular support ring and is integrally provided with the coal bunker 1, which can strengthen the strength of the coal bunker 1 body. The second support frame 82 is an annular support ring and is integrally provided with the coal hopper 2, which can strengthen the strength of the coal hopper 2 body. The pulley 83 is fixedly provided on the second support frame 82 and abuts against the side surface of the first support frame 81 at the same time. The rolling surface of the side surface of the pulley 83 is fitted on the side surface of the first support frame 81. In this embodiment, the illustrated first support frame 81 and the upper convex part 511 are of the same structure.

[0063] As Figure 4 shown, the outer peripheral surface of the lower part of the coal hopper 2 has a stepped surface 23. The stepped surface 23 surrounds the outer peripheral surface of the coal hopper 2. The lower part of the coal hopper 2 is inserted into the upper end of the coal dropping pipe 3. The stepped surface 23 of the coal hopper 2 is located on the upper end surface of the coal dropping pipe 3. An annular bearing 93 is provided between the stepped surface 23 of the coal hopper 2 and the upper end surface of the coal dropping pipe 3, making them perform rolling friction movement relative to each other. It bears all the weight of the coal hopper 2, playing the role of reducing wear and resistance.

[0064] The working principle of this embodiment is specifically described below:

[0065] As Figure 1 、 8 shown, the raw coal falls from the coal bunker 1 to the coal hopper 2. The driving assembly periodically drives the coal hopper 2 to rotate forward and backward. The scraper assembly that rotates together with the coal hopper 2 in the coal hopper 2 breaks the arch of the raw coal and conveys it to the coal dropping pipe 3. The raw coal falls through the coal dropping pipe 3 to the coal feeder 4. The sealing structure can effectively prevent the raw coal particles or dust from escaping. During the rotation of the coal hopper 2, the gears 73 and pulleys 83 arranged in a "pin" shape can effectively stabilize the rotation of the coal hopper 2 and avoid the shaking of the coal hopper 2 during rotation.

[0066] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A coal feeding device, comprising a coal bunker, a coal hopper, and a coal drop pipe, wherein the coal bunker is connected to the upper portion of the coal hopper, and the coal drop pipe is connected to the lower portion of the coal hopper, characterized in that: The coal bunker and the coal drop pipe are fixedly arranged, and the coal hopper is rotatably arranged relative to the coal bunker and the coal drop pipe. The lower part of the coal bunker extends into the upper part of the coal hopper. The coal feeding device further includes a sealing structure provided between the lower portion of the coal bunker and the upper portion of the coal hopper, a support assembly provided between the coal bunker and the upper portion of the coal hopper, a drive assembly provided between the coal drop pipe and the lower portion of the coal hopper, and a scraper assembly provided in the coal hopper. The sealing structure includes a first sealing portion formed by the portion of the lower part of the coal bunker extending into the coal hopper, a second sealing portion formed by the upper part of the coal hopper located outside the first sealing portion, and a sealing member. The first sealing portion and the second sealing portion cooperate to form a sealing area. The sealing member is arranged in the sealing area. The diameter of the first sealing portion gradually decreases from top to bottom and is consistent with the shape of the lower part of the coal bunker; the diameter of the second sealing portion gradually decreases from top to bottom. The lower end of the first sealing portion forms a lower convex portion, which extends toward the second sealing portion. The maximum diameter of the lower convex portion is not greater than the minimum diameter of the second sealing portion, so as to ensure smooth docking during installation. The upper end of the first sealing portion forms an upper convex portion, which extends toward the second sealing portion. The maximum diameter of the upper convex portion is not less than the maximum diameter of the second sealing portion, so as to limit the depth of the coal bunker extending downward into the coal hopper. The upper part of the coal hopper protrudes inward to form the second sealing portion, which cooperates with the upper and lower convex portions of the first sealing portion to form the sealing area. The scraper assembly includes a plurality of scrapers, the length direction of the scraper spirally extending along the axis direction of the coal hopper, the upper end of the scraper extending into the coal bunker, the upper end of the scraper having a notch matching the shape of the portion of the coal bunker extending into the coal hopper, the scraper having a connecting edge, a scraper edge opposite to the connecting edge, and a blade connecting the connecting edge and the scraper edge, the connecting edge being connected to the inner wall surface of the coal hopper, a V-shaped connecting portion being provided between the upper end of the connecting edge and the upper end of the scraper edge, the V-shaped connecting portion forming the notch, the surface of the side where the V-shaped connecting portion is connected to the connecting edge being an arc surface, the two sides of the arc surface being connected to the two sides of the blade, the side where the V-shaped connecting portion is connected to the scraper edge being in contact with the inner wall surface of the coal bunker, the upper end of the scraper edge being an arc edge, and the connection between the upper end of the scraper edge and the blade is rounded, and when the coal hopper rotates, the coal hopper drives the scraper to rotate synchronously.

2. The coal feeding device according to claim 1, characterized in that: The driving assembly drives the coal hopper to rotate. The driving assembly includes a power source, a rack arranged on the outer periphery of the coal hopper, and a gear assembly connected to the power source. The gear assembly includes at least three gears that are simultaneously engaged with the rack, and at least three of the gears are evenly distributed.

3. The coal feeding device according to claim 2, characterized in that: When there is only one power source, at least one of the three gears is sleeved on the output end of the power source; when there are multiple power sources, the number of power sources does not exceed the number of gears, and each power source is correspondingly provided with one gear.

4. The coal feeding device according to claim 1, characterized in that: The support assembly includes a first support frame arranged on the coal bin, a second support frame arranged on the coal hopper, and a pulley assembly. The pulley assembly includes at least three rotatable pulleys, at least three of the pulleys are evenly distributed, and at least three of the pulleys are arranged between the first support frame and the second support frame.

5. The coal feeding device according to claim 1, characterized in that: The outer peripheral surface of the lower part of the coal hopper has a step surface, the lower part of the coal hopper is inserted into the upper end of the coal drop pipe, the step surface of the coal hopper is located on the upper end surface of the coal drop pipe, and an annular bearing is provided between the step surface of the coal hopper and the upper end surface of the coal drop pipe.

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