Mixing device and method for coal blending combustion of thermal power plant

Abstract

The invention relates to the technical field of thermal power plant coal blending, in particular to a mixing device for thermal power plant coal blending combustion and a method thereof.The mixing device comprises a mixing box and a support, a discharging pipe is installed at the bottom of the front face of the mixing box, a feeding tank is fixedly installed at the top of the mixing box, and a smashing box is fixedly installed on the right side of the top of the mixing box; a feeding box is fixedly mounted at the top of the crushing box, a crushing device is arranged in the feeding box, the crushing device comprises a transmission mechanism and a crushing mechanism, the transmission mechanism comprises a motor, a transmission box and a transmission shaft, and the crushing mechanism comprises crushing teeth, a clamping plate, a gear box, a swing plate and a center shaft. According to the mixing device and method for coal blending combustion of the thermal power plant, coal briquettes are crushed into a plurality of small briquettes at the tops of the crushing teeth along with continuous contact between the crushing teeth and the clamping plates, and the crushed small briquettes fall into the mixing box, so that large coal is prevented from entering the mixing box, and the poor mixing effect is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of coal blending in thermal power plants, and in particular to a mixing device and method for blending and burning coal in thermal power plants. Background Art

[0002] Coal-fired assets account for 70% of the cost of power generation companies. Due to the prominent contradiction between the supply and demand of power coal and the high coal price, the blending technology is the process of mixing several different types of coal with different properties in a certain proportion to complete the power generation process when the coal is burned in the boiler. Its basic principle is to use the composition of different types of coal to blend and mix according to requirements, so that the final blended coal can reach or approach the design coal requirements of the boiler in terms of performance indicators, so as to make the boiler high in efficiency, sufficient in output, and good in environmental protection performance.

[0003] The existing mixing device for coal blending and combustion cannot achieve sufficient and uniform mixing of the coal materials during mixing, which will result in poor quality of the mixed coal, affecting the working efficiency of the boiler. Moreover, after the mixing is completed, the inner wall of the mixing device cannot be effectively cleaned, resulting in a large amount of coal adhering to the inside of the mixing device for a long time, causing a certain degree of corrosion to the mixing device.

[0004] A mixing device for coal blending and combustion in a thermal power plant is disclosed in the patent document with publication number CN114917795A. When mixing coal, the proportioned coal is added through the feeding pipe, and then the servo motor is started. The rotation of the servo motor drives the rotating shaft to rotate, so that the conveying roller and the stirring rod rotate, and also drives the rotating rod to rotate. The rotation of the rotating rod and the setting of the gear ring make the gear rotate, and then the gear rotates. During the gear rotation, the gear ring will push the push ring to move upward, and then the push plate will be pushed upward by the push rod, so that the connecting plate moves upward, and then the sealing plate opens, so that the coal in the feeding pipe enters the interior of the tank body. Through the intermittent opening of the stirring rod, the stirring plate and the feeding pipe, the coal is fully stirred and mixed, the uniformity of the mixing is guaranteed, and the mixed coal meets the requirements, thereby ensuring the combustion efficiency of the boiler.

[0005] However, in the mixing device used for blending coal in this thermal power plant, some of the coal will still enter the coal blending tank in larger pieces during the process of coal entering, resulting in poor mixing effect. Summary of the invention

[0006] The object of the present invention is to provide a mixing device and method for coal blending in a thermal power plant to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A mixing device for coal blending in a thermal power plant, comprising a mixing box and a bracket fixedly installed at the bottom of the mixing box, a discharge pipe is installed at the bottom of the front of the mixing box, a feed tank is fixedly installed at the top of the mixing box, a crushing box is fixedly installed on the right side of the top of the mixing box, and a feed box is fixedly installed on the top of the crushing box; A crushing device is arranged inside the feed box, and the crushing device includes a transmission mechanism and a crushing mechanism, and the transmission mechanism includes a motor, a transmission box and a transmission shaft, the transmission box is fixedly mounted on the back of the mixing box, the motor is mounted on the back of the transmission box, the transmission shaft is connected to the front of the transmission box, and a box cover is hinged on the top of the feed box through a hinge; The crushing mechanism includes crushing teeth, a clamping plate, a gear box, a swinging plate and a central shaft. The crushing teeth are fixedly connected to the outer surface of the transmission shaft, the clamping plate is fixedly installed on the inner wall of the crushing box, the gear box is fixedly installed on the front of the crushing box, the central shaft is fixedly connected to both sides of the inner wall of the feed box, and the swinging plate is sleeved on the outer surface of the central shaft.

[0008] Preferably, a chain transmission mechanism is arranged inside the transmission box, and the chain transmission mechanism includes large and small sprockets and a transmission chain, the large sprocket is connected to the output shaft of the motor, the small sprocket is connected to the center of the transmission shaft, and the outer surface of the transmission shaft is connected to the inner wall of the crushing box through a bearing seat.

[0009] Preferably, auxiliary teeth are fixedly connected to the side of the splint, the crushing teeth and the auxiliary teeth are staggered, the inner wall of the gear box is connected to two mutually meshing gears through a bearing seat, and the front end of the transmission shaft is connected to the gear.

[0010] Preferably, the output end of the motor is connected to a rotating shaft, the outer surface of the rotating shaft is fixedly connected to a mixing plate, and the outer surface of the mixing plate is provided with a through groove.

[0011] Preferably, a telescopic spring is fixedly connected to one side of the inner wall of the through groove, a mixing ball is fixedly connected to one end of the telescopic spring away from the inner wall of the through groove, a telescopic rod is fixedly connected to the other side of the inner wall of the through groove, a ring is fixedly connected to the outer surface of the telescopic rod, a centrifugal plate is fixedly connected to the side of the ring, and a scraper is fixedly connected to the side of the centrifugal plate.

[0012] Preferably, one end of the telescopic rod away from the inner wall of the through groove is fixedly connected to the outer surface of the mixing ball, the scrapers are symmetrically distributed on the left and right sides of the centrifugal plate, the scrapers on both sides have different lengths, and one side of the scraper is in contact with the surface of the mixing plate.

[0013] Preferably, one end of the rotating shaft is connected to a connecting plate, the front side of the inner wall of the mixing box is fixedly connected to an oil storage tank, a connecting shaft is installed at the center of the back side of the oil storage tank, a slide groove is opened on the back side of the oil storage tank, and an oil filling pipe is fixedly connected to the inside of the slide groove.

[0014] Preferably, one end of the oil filling pipe extends to the interior of the oil storage tank, one end of the oil filling pipe is provided with a one-way valve, the interior of the oil filling pipe is slidably connected to a large piston, the back of the large piston is fixedly connected to a sliding rod, the end of the sliding rod away from the large piston is fixedly connected to a small piston, the other end of the oil filling pipe is fixedly connected to an oil outlet pipe, and the end of the oil outlet pipe away from the oil filling pipe is fixedly connected to an oil guide plate.

[0015] Preferably, an electric control box is installed on the left side of the mixing box, and a connecting port connected to the crushing box is opened on the top of the mixing box.

[0016] A mixing method of a mixing device for coal blending and combustion in a thermal power plant, comprising the following steps: S1: In the process of coal blending and combustion, first open the box cover, put different types of coal from the feed tank and feed box, and after the coal enters the feed box, start the motor, the output shaft of the motor drives the chain transmission mechanism inside the transmission box to work, and the transmission shaft is driven to rotate through the sprocket, and the transmission shaft drives the crushing teeth on its outer surface to rotate. The coal block is at the top of the crushing teeth. As the crushing teeth and the clamping plates are in continuous contact, it will be crushed into many small pieces, and the crushed small pieces of coal fall into the inside of the mixing box; S2: After all the coal enters the mixing box, the output shaft of the motor drives the rotating shaft to rotate, and the rotating shaft drives the mixing plate on its outer surface to rotate, and the mixing plate mixes all the coal; S3: During the rotation of the shaft, the connecting shaft will be driven to rotate. During the mixing process, lubricating oil can be injected into the one-way valve. After the lubricating oil enters the oil filling pipe, it will flow inside the oil filling pipe under the action of centrifugal force, and then flow out from the gap between the large piston, the small piston and the oil filling pipe, enter the oil outlet pipe and contact the oil guide plate. After being absorbed by the oil guide plate, it is coated on the surface of the connecting shaft, thereby achieving a lubricating effect.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The mixing device and method for coal blending in the thermal power plant, the coal block is at the top of the crushing teeth, and as the crushing teeth and the clamping plates are in continuous contact, it will be crushed into many small pieces, and the crushed small pieces of coal fall into the interior of the mixing box, thereby preventing large pieces of coal from entering the mixing box, resulting in poor mixing effect.

[0018] 2. The mixing device and method for coal blending in the thermal power plant, the telescopic rod will drive the centrifugal plate to move back and forth during the extension and retraction process, and the centrifugal plate will drive the scrapers on both sides to scrape the surface of the mixing plate during the movement, so as to scrape off the coal material attached to the surface of the mixing plate to prevent it from attaching to the inner wall of the mixing plate and affecting the subsequent mixing.

[0019] 3. In the mixing device and method for coal blending in thermal power plants, the lubricating oil flows inside the oil filling pipe, flows through the gap between the large piston, the small piston and the oil filling pipe, is pushed into the oil outlet pipe by the small piston, and is absorbed by the oil guide plate, so that the lubricating oil is coated on the surface of the connecting shaft during its rotation, making the connecting shaft and the rotating shaft rotate more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a side structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the internal structure of the mixing box of the present invention; Figure 4 It is a schematic diagram of the transmission mechanism structure of the present invention; Figure 5 It is a schematic diagram of the structure of the communication port of the present invention; Figure 6 It is a schematic diagram of the stirring mechanism structure of the present invention; Figure 7 for Figure 6 A schematic diagram of the structure enlargement in the middle; Figure 8 It is a structural schematic diagram of the oil injection mechanism of the present invention; Fig. 9 for Figure 8 A magnified schematic diagram of the structure at B in the middle; Fig.10 A cross-sectional view of the oil injection pipe of the present invention; Fig.11 A schematic diagram of the swing plate structure of the present invention.

[0022] In the figure: 1, mixing box; 2, bracket; 3, discharge pipe; 4, electric control box; 5, feed tank; 6, feed box; 601, box cover; 602, crushing box; 603, motor; 604, transmission box; 605, transmission shaft; 606, crushing teeth; 607, clamping plate; 608, gear box; 609, swing plate; 610, central axis; 6031, rotating shaft; 6032, mixing plate; 6033, connecting plate; 6034 , through groove; 6035, telescopic spring; 6036, mixing ball; 6037, telescopic rod; 6038, collar; 6039, centrifugal plate; 60310, scraper; 7, connecting shaft; 701, oil storage tank; 702, slide groove; 703, oil filling pipe; 7031, one-way valve; 7032, large piston; 7033, slide rod; 7034, small piston; 7035, oil outlet pipe; 7036, oil guide plate; 8, connecting port. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See also Figure 1-Figure 11 , the present invention provides a technical solution: Embodiment 1: A mixing device for coal blending in a thermal power plant, comprising a mixing box 1 and a bracket 2 fixedly mounted at the bottom of the mixing box 1, a discharge pipe 3 is mounted at the bottom of the front of the mixing box 1, a feed tank 5 is fixedly mounted on the top of the mixing box 1, a crushing box 602 is fixedly mounted on the right side of the top of the mixing box 1, a feed box 6 is fixedly mounted on the top of the crushing box 602, and an electric control box 4 is mounted on the left side of the mixing box 1; A crushing device is arranged inside the feed box 6, and the crushing device includes a transmission mechanism and a crushing mechanism. The transmission mechanism includes a motor 603, a transmission box 604 and a transmission shaft 605. The transmission box 604 is fixedly installed on the back of the mixing box 1, the motor 603 is installed on the back of the transmission box 604, and the transmission shaft 605 is connected to the front of the transmission box 604. The top of the feed box 6 is hinged with a box cover 601 through a hinge. The top of the mixing box 1 is provided with a connecting port 8 connected to the crushing box 602. The electric control box 4 is electrically connected to the motor 603. The crushing mechanism includes crushing teeth 606, clamping plates 607, gear boxes 608, swinging plates 609 and central shaft 610. The crushing teeth 606 are fixedly connected to the outer surface of the transmission shaft 605, the clamping plates 607 are fixedly installed on the inner wall of the crushing box 602, the gear box 608 is fixedly installed on the front of the crushing box 602, the central shaft 610 is fixedly connected to both sides of the inner wall of the feed box 6, and the swinging plate 609 is sleeved on the outer surface of the central shaft 610. During the feeding process of the feed box 6, after the coal falls on the swinging plate 609, the swinging plate 609 will rotate around the central shaft 610, so that the feeding speed of the coal will not be too fast, to prevent blockage caused by the feeding speed being too fast, and affect subsequent crushing.

[0026] A chain transmission mechanism is arranged inside the transmission box 604, and the chain transmission mechanism includes large and small sprockets and a transmission chain. The large sprocket is connected to the output shaft of the motor 603, and the small sprocket is connected to the center of the transmission shaft 605. The outer surface of the transmission shaft 605 is connected to the inner wall of the crushing box 602 through a bearing seat.

[0027] Auxiliary teeth are fixedly connected to the side of the clamping plate 607, and the crushing teeth 606 are staggered with the auxiliary teeth. The inner wall of the gear box 608 is connected to two mutually meshing gears through a bearing seat, and one end of the front side of the transmission shaft 605 is connected to the gear.

[0028] The output end of the motor 603 is connected to a rotating shaft 6031, and a mixing plate 6032 is fixedly connected to the outer surface of the rotating shaft 6031. A through groove 6034 is provided on the outer surface of the mixing plate 6032. One end of the rotating shaft 6031 is connected to the output shaft of the motor 603, and the other end is connected to the inner wall of the mixing box 1 through a bearing. Different coal materials can pass through the through groove 6034 to make the coal materials mixed more fully.

[0029] Start the motor 603, the output shaft of the motor 603 drives the chain transmission mechanism inside the transmission box 604 to work, and drives the transmission shaft 605 to rotate through the sprocket, and the transmission shaft 605 drives the crushing teeth 606 on its outer surface to rotate. The coal block is at the top of the crushing teeth 606. As the crushing teeth 606 are in continuous contact with the clamping plate 607, it will be crushed into many small pieces. The crushed small pieces of coal fall into the interior of the mixing box 1, thereby preventing large pieces of coal from entering the mixing box, resulting in poor mixing effect.

[0030] A telescopic spring 6035 is fixedly connected to one side of the inner wall of the through groove 6034, and a mixing ball 6036 is fixedly connected to one end of the telescopic spring 6035 away from the inner wall of the through groove 6034. A telescopic rod 6037 is fixedly connected to the other side of the inner wall of the through groove 6034, and a ring 6038 is fixedly connected to the outer surface of the telescopic rod 6037. A centrifugal plate 6039 is fixedly connected to the side of the ring 6038, and a scraper 60310 is fixedly connected to the side of the centrifugal plate 6039.

[0031] One end of the telescopic rod 6037 away from the inner wall of the through groove 6034 is fixedly connected to the outer surface of the mixing ball 6036, and the scrapers 60310 are symmetrically distributed on the left and right sides of the centrifugal plate 6039. The scrapers 60310 on both sides have different lengths, and one side of the scraper 60310 is in contact with the surface of the mixing plate 6032.

[0032] During the coal mixing process, part of the coal will enter the mixing ball 6036, and then be mixed in a small range inside it, which is different from the overall mixing, thereby improving the mixing effect. During the rotation of the mixing plate 6032, centrifugal force will be generated. Under the action of the centrifugal force, the telescopic rod 6037 will continue to extend and move inside the through slot 6034 to the side away from the rotating shaft 6031. After the extension, the telescopic rod 6037 will push the mixing ball 6036 and squeeze the telescopic spring 6035. When the telescopic spring 6035 is squeezed to the maximum compression amount, Under the action of its own restoring force, the mixing ball 6036 will be pushed to rebound and squeeze the telescopic rod 6037 to contract, so that the mixing ball 6036 will reciprocate within a certain range, further improving the mixing effect. In the process of extension and retraction of the telescopic rod 6037, the centrifugal plate 6039 will be driven to move back and forth. During the movement, the centrifugal plate 6039 will drive the scrapers 60310 on both sides to scrape the surface of the mixing plate 6032, and scrape off the coal material attached to the surface of the mixing plate 6032 to prevent it from adhering to the inner wall of the mixing plate 6032 and affecting the subsequent mixing.

[0033] Embodiment 2: Based on embodiment 1, one end of the rotating shaft 6031 is connected to a connecting plate 6033, the front of the inner wall of the mixing box 1 is fixedly connected to an oil storage tank 701, a connecting shaft 7 is installed at the center of the back of the oil storage tank 701, a slide groove 702 is opened on the back of the oil storage tank 701, and the interior of the slide groove 702 is fixedly connected to an oil filling pipe 703.

[0034] One end of the oil filling pipe 703 extends to the interior of the oil storage tank 701, and one end of the oil filling pipe 703 is provided with a one-way valve 7031. The interior of the oil filling pipe 703 is slidably connected to a large piston 7032, and the back of the large piston 7032 is fixedly connected to a slide rod 7033, and the end of the slide rod 7033 away from the large piston 7032 is fixedly connected to a small piston 7034, and the other end of the oil filling pipe 703 is fixedly connected to an oil outlet pipe 7035, and the end of the oil outlet pipe 7035 away from the oil filling pipe 703 is fixedly connected to an oil guide plate 7036.

[0035] The oil storage tank 701 is an annular structure, one end of the connecting shaft 7 is located at the center of the oil storage tank 701 and is rotatably connected to the annular center of the oil storage tank 701. The oil filling pipe 703 extends to the front of the mixing box 1. The one-way valve 7031 is located at the front of the mixing box 1. The one-way valve 7031 only allows lubricating oil to enter the interior of the oil filling pipe 703 from the outside through the one-way valve 7031. There is a gap between the large piston 7032 and the small piston 7034 and the inner wall of the oil filling pipe 703, and the oil guide plate 7036 is made of oil-absorbing cotton.

[0036] After the lubricating oil enters the oil filling pipe 703, it will flow inside the oil filling pipe 703 under the action of centrifugal force. During the flow, it will flow through the gap between the large piston 7032, the small piston 7034 and the oil filling pipe 703, and after being pushed to the inside of the oil outlet pipe 7035 by the small piston 7034, it will be absorbed by the oil guide plate 7036, so that the lubricating oil will be coated on the surface of the connecting shaft 7 during the rotation process, making the connecting shaft 7 and the rotating shaft 6031 rotate more smoothly.

[0037] A mixing method of a mixing device for coal blending and combustion in a thermal power plant, comprising the following steps: S1: In the process of coal blending and combustion, first open the box cover 601, put different types of coal from the feed tank 5 and the feed box 6, and after the coal enters the feed box 6, start the motor 603, the output shaft of the motor 603 drives the chain transmission mechanism inside the transmission box 604 to work, and drives the transmission shaft 605 to rotate through the sprocket, and the transmission shaft 605 drives the crushing teeth 606 on its outer surface to rotate. The coal block is at the top of the crushing teeth 606. As the crushing teeth 606 are in continuous contact with the clamping plate 607, it will be crushed into many small pieces, and the crushed small pieces of coal fall into the interior of the mixing box 1; S2: After all the coal enters the mixing box 1, the output shaft of the motor 603 drives the rotating shaft 6031 to rotate, and the rotating shaft 6031 drives the mixing plate 6032 on its outer surface to rotate, and the mixing plate 6032 mixes all the coal; S3: During the rotation of the rotating shaft 6031, the connecting shaft 7 will be driven to rotate. During the mixing process, lubricating oil can be injected into the one-way valve 7031. After the lubricating oil enters the oil filling pipe 703, it will flow inside the oil filling pipe 703 under the action of centrifugal force, and then flow out from the gap between the large piston 7032 and the small piston 7034 and the oil filling pipe 703, enter the oil outlet pipe 7035 and contact the oil guide plate 7036. After being absorbed by the oil guide plate 7036, it is coated on the surface of the connecting shaft 7, thereby achieving a lubricating effect.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mixing device for coal blending in a thermal power plant, comprising a mixing box (1) and a bracket (2) fixedly mounted on the bottom of the mixing box (1), wherein a discharge pipe (3) is mounted on the bottom of the front of the mixing box (1), characterized in that: A feed tank (5) is fixedly mounted on the top of the mixing box (1), a crushing box (602) is fixedly mounted on the right side of the top of the mixing box (1), and a feed box (6) is fixedly mounted on the top of the crushing box (602); A crushing device is arranged inside the feed box (6), the crushing device comprising a transmission mechanism and a crushing mechanism, the transmission mechanism comprising a motor (603), a transmission box (604) and a transmission shaft (605), the transmission box (604) is fixedly mounted on the back of the mixing box (1), the motor (603) is mounted on the back of the transmission box (604), the transmission shaft (605) is connected to the front of the transmission box (604), and a box cover (601) is hingedly connected to the top of the feed box (6) via a hinge; The crushing mechanism comprises crushing teeth (606), a clamping plate (607), a gear box (608), a swinging plate (609) and a central shaft (610); the crushing teeth (606) are fixedly connected to the outer surface of the transmission shaft (605); the clamping plate (607) is fixedly installed on the inner wall of the crushing box (602); the gear box (608) is fixedly installed on the front of the crushing box (602); the central shaft (610) is fixedly connected to both sides of the inner wall of the feed box (6); and the swinging plate (609) is sleeved on the outer surface of the central shaft (610).

2. A mixing device for coal blending and combustion in a thermal power plant according to claim 1, characterized in that: A chain transmission mechanism is arranged inside the transmission box (604), the chain transmission mechanism comprising large and small sprockets and a transmission chain, the large sprocket is connected to the output shaft of the motor (603), the small sprocket is connected to the center of the transmission shaft (605), and the outer surface of the transmission shaft (605) is connected to the inner wall of the crushing box (602) via a bearing seat.

3. A mixing device for coal blending and combustion in a thermal power plant according to claim 1, characterized in that: Auxiliary teeth are fixedly connected to the side of the clamping plate (607), the crushing teeth (606) and the auxiliary teeth are staggered, the inner wall of the gear box (608) is connected to two mutually meshing gears through a bearing seat, and the front end of the transmission shaft (605) is connected to the gear.

4. A mixing device for coal blending and combustion in a thermal power plant according to claim 1, characterized in that: The output end of the motor (603) is connected to a rotating shaft (6031), the outer surface of the rotating shaft (6031) is fixedly connected to a mixing plate (6032), and the outer surface of the mixing plate (6032) is provided with a through groove (6034).

5. A mixing device for coal blending and combustion in a thermal power plant according to claim 1, characterized in that: A telescopic spring (6035) is fixedly connected to one side of the inner wall of the through slot (6034); a mixing ball (6036) is fixedly connected to one end of the telescopic spring (6035) away from the inner wall of the through slot (6034); a telescopic rod (6037) is fixedly connected to the other side of the inner wall of the through slot (6034); a collar (6038) is fixedly connected to the outer surface of the telescopic rod (6037); a centrifugal plate (6039) is fixedly connected to the side of the collar (6038); and a scraper (60310) is fixedly connected to the side of the centrifugal plate (6039).

6. A mixing device for coal blending and combustion in a thermal power plant according to claim 5, characterized in that: One end of the telescopic rod (6037) away from the inner wall of the through groove (6034) is fixedly connected to the outer surface of the mixing ball (6036), and the scraper (60310) is symmetrically distributed on the left and right sides of the centrifugal plate (6039). The scrapers (60310) on both sides have different lengths, and one side of the scraper (60310) is in contact with the surface of the mixing plate (6032).

7. A mixing device for coal blending and combustion in a thermal power plant according to claim 1, characterized in that: One end of the rotating shaft (6031) is connected to a connecting plate (6033); the front of the inner wall of the mixing box (1) is fixedly connected to an oil storage tank (701); a connecting shaft (7) is installed at the center of the back of the oil storage tank (701); a slide groove (702) is provided on the back of the oil storage tank (701); and an oil filling pipe (703) is fixedly connected to the inside of the slide groove (702).

8. A mixing device for coal blending and combustion in a thermal power plant according to claim 7, characterized in that: One end of the oil filling pipe (703) extends to the interior of the oil storage tank (701); one end of the oil filling pipe (703) is provided with a one-way valve (7031); a large piston (7032) is slidably connected to the interior of the oil filling pipe (703); a sliding rod (7033) is fixedly connected to the back of the large piston (7032); an end of the sliding rod (7033) away from the large piston (7032) is fixedly connected to a small piston (7034); the other end of the oil filling pipe (703) is fixedly connected to an oil outlet pipe (7035); and an end of the oil outlet pipe (7035) away from the oil filling pipe (703) is fixedly connected to an oil guide plate (7036).

9. A mixing device for coal blending and combustion in a thermal power plant according to claim 1, characterized in that: An electric control box (4) is installed on the left side of the mixing box (1), and a connecting port (8) connected to the crushing box (602) is provided on the top of the mixing box (1).

10. A mixing method for a mixing device for coal blending and combustion in a thermal power plant according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: During the process of blending coal for combustion, the box cover (601) is first opened, and different types of coal are put in from the feed tank (5) and the feed box (6). After the coal enters the feed box (6), the motor (603) is started, and the output shaft of the motor (603) drives the chain transmission mechanism inside the transmission box (604) to work, and the transmission shaft (605) is driven to rotate through the sprocket, and the transmission shaft (605) drives the crushing teeth (606) on its outer surface to rotate. The coal blocks are at the top of the crushing teeth (606). As the crushing teeth (606) and the clamping plates (607) are in continuous contact, they are crushed into many small pieces, and the crushed small pieces of coal fall into the interior of the mixing box (1); S2: After all the coal enters the mixing box (1), the output shaft of the motor (603) drives the rotating shaft (6031) to rotate, and the rotating shaft (6031) drives the mixing plate (6032) on its outer surface to rotate, and the mixing plate (6032) mixes all the coal; S3: During the rotation of the rotating shaft (6031), the connecting shaft (7) is driven to rotate. During the mixing process, lubricating oil can be injected into the one-way valve (7031). After the lubricating oil enters the oil injection pipe (703), it flows inside the oil injection pipe (703) under the action of centrifugal force, flows out from the gap between the large piston (7032) and the small piston (7034) and the oil injection pipe (703), enters the oil outlet pipe (7035), contacts the oil guide plate (7036), is absorbed by the oil guide plate (7036), and is coated on the surface of the connecting shaft (7), thereby achieving a lubricating effect.

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