Sweeping scraper structure at tail of coal feeding belt conveyor of coal-fired power plant

Abstract

The utility model relates to the technical field of coal feeding belt conveyors, in particular to a sweeping scraper structure at the tail of a coal feeding belt conveyor of a coal-fired power plant. According to the technical scheme, the device comprises a motor, a rack, a conveying roller, a pump shell, a guide rod and a brush plate, the conveying roller is rotationally installed in the rack, a cam with the thickness gradually increasing towards one side is arranged at one end of the conveying roller, the outer wall of the conveying roller is sleeved with a conveying belt, the brush plate is arranged on one side of the conveying belt, and a second brush is arranged at one end of the brush plate. A sliding sleeve is embedded in the machine frame, guide rods are arranged at the front end and the rear end of the brush plate, the outer walls of the guide rods are sleeved with limiting rings, springs are arranged between the limiting rings and the machine frame, and a scraping plate is arranged at one end of the machine frame. Kinetic energy is transmitted through the conveying roller of the coal feeding belt conveyor, the brush plate is driven to brush conveying materials scraped by the scraper blade, deep cleaning is conducted on the outer wall of the conveying belt, use of extra electrical equipment is avoided, and meanwhile the residual quantity of materials on the outer wall of the conveying belt is reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal conveyor belt technology, and in particular to a cleaning scraper structure at the tail of a coal conveyor belt in a coal-fired power plant. Background Technology

[0002] A coal-fired power plant is a type of thermal power plant. Its core working principle is to generate electricity by using the heat energy produced by burning coal. The raw coal is processed by crushing, screening, and drying, and then sent to the coal bunker of the boiler or directly injected into the furnace through a conveying system, mainly a coal conveyor belt. The coal conveyor belt is the most core and commonly used continuous transport equipment in the fuel conveying system of a coal-fired power plant. It is usually one or more rubber conveyor belts that are connected end to end and operate in a cycle.

[0003] The following problems exist in the coal conveyor belt process: Coal, especially wet coal containing fine coal dust or highly viscous coal, adheres to the conveyor belt surface during transportation. Even at the unloading point of the head roller, due to centrifugal force, adhesion force, and conveyor belt bending, some fine coal dust or wet coal cannot be completely thrown off the conveyor belt. As the return conveyor belt returns, the idlers on the return section squeeze the material adhering to the belt, making it even more difficult to remove. The coal dust adhering to the return belt will fall off at the tail roller, redirecting roller, or idlers along the route, causing serious pollution to the ground and equipment along the line, increasing the amount of cleaning work, deteriorating the working environment, posing a risk of dust explosion or spontaneous combustion, and easily causing belt deviation. In severe cases, it may damage the belt edge or cause equipment failure and shutdown. The existing technology adds a scraper to the tail of the machine to clean the material. However, because the scraper cannot be installed in close contact with the conveyor belt, there is still material adhering after cleaning, and the cleaning effect is not obvious. Using electric equipment for cleaning increases additional power consumption. Therefore, we propose a cleaning scraper structure for the tail of the coal conveyor belt in coal-fired power plants to solve the existing problems. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a cleaning scraper structure for the tail end of a coal conveyor belt in a coal-fired power plant.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a cleaning scraper structure for the tail end of a coal conveyor belt in a coal-fired power plant, comprising a motor, a frame, a conveyor roller, a pump housing, guide rods, and a brush plate. The conveyor roller is rotatably mounted inside the frame. A motor is located on one side of the conveyor roller, and the motor is connected to the conveyor roller via a gearbox output. A cam with a gradually increasing thickness towards one side is located at one end of the conveyor roller. A conveyor belt is sleeved on the outer wall of the conveyor roller. A brush plate is located on one side of the conveyor belt. Two equally spaced brushes are located at one end of the brush plate. A sliding sleeve is embedded inside the frame. Guide rods are slidably inserted into the sliding sleeves at both ends of the brush plate. A limiting ring is sleeved on the outer wall of the guide rod. A spring sleeved on the outside of the guide rod is located between the limiting ring and the frame. A scraper is located at one end of the frame.

[0006] Preferably, one end of the limiting ring is provided with a slider, and one end of the frame is provided with a guide rail. The slider is slidably mounted on the outer wall of the guide rail. The limiting ring slides on the outer wall of the guide rail via the slider, providing sliding guidance for the limiting ring and the guide rod, thus avoiding the influence of the frictional force of the cam rotation.

[0007] Preferably, one end of the guide rod is rotatably mounted with a ball bearing that rolls against the inner wall of the cam. The ball bearing reduces friction and resistance during the extrusion process between the cam and the guide rod.

[0008] Preferably, a brush roller is rotatably mounted inside the frame, and the outer wall of the brush roller is provided with brushes arranged in a circular array and in contact with the outer wall of the conveyor roller and the inner wall of the upper end of the conveyor belt. The brush roller rotates inside the frame, driving the brushes to clean the outer wall of the conveyor roller and the inner wall of the upper end of the conveyor belt.

[0009] Preferably, a first gear is sleeved on the outer wall of the conveying roller, and a second gear is sleeved on the outer wall of the brush roller, meshing with the first gear. When the first gear and the second gear mesh, the rotational force of the conveying roller is applied to the brush roller, causing the brush roller to rotate.

[0010] Preferably, a pump casing is provided on the front side of the frame, and a pump shaft is rotatably mounted inside the pump casing at the front end of the frame. An impeller, rotatably mounted inside the pump casing, is sleeved on the outer wall of the pump shaft. A driven wheel is sleeved on the outer wall of the pump shaft, and a drive wheel with a radius larger than the driven wheel is sleeved on the outer wall of the conveying roller. Belts are fitted onto the outer walls of both the drive wheel and the driven wheel. The pump shaft drives the impeller to rotate inside the pump casing, generating suction force. The rotational force of the conveying roller, through the belt, links the drive wheel and the transmission wheel, causing the pump shaft to rotate faster.

[0011] Preferably, the pump casing output end is provided with a conveying pipe located inside the conveyor belt. The lower end of the conveying pipe is provided with two sets of nozzles equidistantly distributed with their outlets inclined in opposite directions. A support base is provided inside the frame, and a pressure ball that rolls and presses against the lower end of the conveyor belt is rotatably mounted inside the upper end of the support base. The section of the conveyor belt compressed by the pressure ball is lifted upwards, causing the section to tilt from the center outwards, facilitating the flow of material. The airflow drawn by the pump casing passes through the inner wall of the lower end of the conveyor belt at the corresponding inclined points of the conveying pipe and nozzles, blowing away the detached material.

[0012] Preferably, the pump casing suction end is provided with a support ring, and symmetrically distributed pressure rings are provided on one side of the support ring. A cylindrical filter screen is provided between the pressure rings, and support rods arranged in a ring array are provided between the pressure rings. The support ring and pressure rings are fixed together by screws. The suction airflow is filtered through the filter screen, which is fixed by the pressure rings and support rods. The pressure rings and support rings are fixed together by screws.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model of a coal conveyor belt uses friction transmission between the conveyor roller and the conveyor belt. The conveyor pipe is driven to rotate by a motor. At the tail of the coal conveyor belt, a scraper removes most of the material. The conveyor roller drives the cam to rotate as it passes the conveyor belt. The gradually increasing thickness of the inner wall of the cam squeezes the elastically supported guide rod, which in turn drives the brush plate to reciprocate. The brush plate scrapes the outer wall of the conveyor belt, causing small particles of tightly adhered material to fall off. When the thickness of the cam exceeds the guide rod, the guide rod is reset by a spring, avoiding the use of additional electrical equipment and achieving efficient cleaning of the outer wall of the conveyor belt. Attached Figure Description

[0015] Figure 1 This is a front-view three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a top-view three-dimensional structural diagram of the present invention;

[0017] Figure 3 This is a top-view three-dimensional structural diagram of the spring of this utility model;

[0018] Figure 4 This is a side view of the three-dimensional structure of the brush roller of this utility model;

[0019] Figure 5 This is a side sectional three-dimensional structural diagram of the pump casing of this utility model.

[0020] Reference numerals: 1. Motor; 2. Gearbox; 3. Frame; 4. Conveyor belt; 5. Brush roller; 6. Conveyor roller; 7. Pump casing; 8. Scraper; 9. Pump shaft; 10. Cam; 11. Gear 1; 12. Gear 2; 13. Limiting ring; 14. Ball bearing; 15. Slider; 16. Spring; 17. Guide rail; 18. Sliding sleeve; 19. Guide rod; 20. Brush plate; 21. Brush 1; 22. Brush 2; 23. Support base; 24. Pressure ball; 25. Conveying pipe; 26. Nozzle; 27. Drive wheel; 28. Belt; 29. ​​Driven wheel; 30. Impeller; 31. Support ring; 32. Filter screen; 33. Pressure ring; 34. Support rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1-5 As shown, the present invention proposes a cleaning scraper structure for the tail end of a coal conveyor belt in a coal-fired power plant, comprising a motor 1, a frame 3, a conveyor roller 6, a pump housing 7, a guide rod 19, and a brush plate 20. The conveyor roller 6 is rotatably mounted inside the frame 3. The motor 1 is located on one side of the conveyor roller 6 and is connected to the conveyor roller 6 via the output end of a gearbox 2. A cam 10 with a gradually increasing thickness is located at one end of the conveyor roller 6. A conveyor belt 4 is sleeved on the outer wall of the conveyor roller 6. A brush plate 20 is located on one side of the conveyor belt 4. A brush 22 with equidistantly distributed bristles 22 is located at one end of the brush plate 20. A sliding sleeve 18 is embedded inside the frame 3. Guide rods 19 are slidably inserted into the sliding sleeve 18 at both ends of the brush plate 20. A limit ring 13 is sleeved on the outer wall of the guide rod 19. A spring 16 sleeved on the outside of the guide rod 19 is located between the limit ring 13 and the frame 3. A scraper 8 is located at one end of the frame 3.

[0023] A slider 15 is provided at one end of the limiting ring 13, and a guide rail 17 is provided at one end of the frame 3. One end of the slider 15 is slidably installed on the outer wall of the guide rail 17.

[0024] One end of the guide rod 19 is rotatably fitted with a ball bearing 14 that rolls and fits against the inner wall of the cam 10;

[0025] Inside the frame 3, a brush roller 5 is rotatably installed. The outer wall of the brush roller 5 is provided with brushes 21 arranged in a ring array and attached to the outer wall of the conveyor roller 6 and the inner wall of the upper end of the conveyor belt 4.

[0026] Gear 11 is sleeved on the outer wall of conveyor roller 6, and gear 2 12 that meshes with gear 11 is sleeved on the outer wall of brush roller 5.

[0027] A pump casing 7 is provided on the front side of the frame 3. A pump shaft 9 is rotatably installed inside the pump casing 7 at the front end of the frame 3. An impeller 30 is rotatably installed inside the pump casing 7 and sleeved on the outer wall of the pump shaft 9. A driven wheel 29 is sleeved on the outer wall of the pump shaft 9. A drive wheel 27 with a radius larger than the driven wheel 29 is sleeved on the outer wall of the conveying roller 6. A belt 28 is sleeved on the outer wall of both the drive wheel 27 and the driven wheel 29.

[0028] The pump casing 7 is provided with a conveying pipe 25 located inside the conveyor belt 4 at the output end. The lower end of the conveying pipe 25 is provided with two sets of nozzles 26 that are equidistantly distributed and whose outlets are inclined in opposite directions. The frame 3 is provided with a support base 23. The upper end of the support base 23 is rotatably installed with a pressure ball 24 that rolls and squeezes against the lower end of the conveyor belt 4.

[0029] The pump casing 7 has a support ring 31 at the suction end, and pressure rings 33 are symmetrically distributed on one side of the support ring 31. A cylindrical filter screen 32 is arranged between the pressure rings 33, and support rods 34 are arranged in a ring array between the pressure rings 33. The support ring 31 and the pressure rings 33 are fixed together by screws.

[0030] Based on the implementation steps of Example 1: Motor 1 drives the conveyor roller 6 to rotate, which drives the conveyor belt 4 to run. The gradually thickening cam 10 at the end of the conveyor roller 6 rotates with the shaft. When the thick end of the cam 10 presses the ball 14 at the end of the guide rod 19, it pushes the guide rod 19 to slide outward along the sliding sleeve 18 and compresses the spring 16. When the thin end of the cam 10 transitions, the spring 16 pushes the guide rod 19 to reset. This process drives the brush plate 20 to scrape back and forth against the outer wall of the conveyor belt 4. The brush 22 on the brush plate 20 removes stubborn coal powder.

[0031] The conveyor roller 6 drives the gear 12 via gear 11, which in turn drives the brush roller 5 to rotate at high speed. The brush 21 on the surface of the brush roller 5 continuously scrapes the inner wall of the conveyor belt 4 and the surface of the conveyor roller 6 to prevent coal powder from accumulating in the gap between the rollers. The conveyor roller 6 drives the pump shaft 9 to rotate at high speed via belt 28. The impeller 30 rotates at high speed to generate negative pressure. After being filtered by the cylindrical filter screen 32, the airflow is sprayed out from the inclined nozzle 26 at the end of the conveyor pipe 25. At this time, the conveyor belt 4 is lifted into a V shape by the pressure ball 24 on the support seat 23. The airflow from the nozzle 26 accurately impacts both sides of the inner wall of the conveyor belt 4, sweeping and collecting the scraped coal powder towards the middle to avoid secondary adhesion. At the same time, it cleans the outer wall of the conveyor roller 6 and the inner wall of the conveyor belt 4.

[0032] The guide rod 19 is elastically pressed by the limiting ring 13 supported by the spring 16. The slider 15 slides along the guide rail 17 to ensure the vertical movement of the brush plate 20. The ball bearing 14 design reduces the friction of the cam 10 and ensures continuous and stable operation. The reciprocating motion of the brush plate 20 removes the coal adhering to the surface. The rotating brush 21 deeply cleans the inner wall of the conveyor belt 4 and the roller. The airflow blows the residual coal powder away from the V-shaped concave area. The cam 10, gear set and belt 28 drive all use the power of the conveyor roller 6, without the need for an independent motor 1, which reduces energy consumption compared to electric drive cleaning equipment. The pressure ball 24 supports and forms a V-shaped groove to guide the coal powder to fall in a concentrated manner, avoid the belt 28 running off track due to spillage, remove coal powder in time to prevent dust accumulation, and reduce the risk of explosion and spontaneous combustion.

[0033] The filter screen 32 prevents foreign objects from clogging the nozzle 26, ensuring smooth airflow. The elastic brush plate 20 avoids hard scraping and damage to the conveyor belt 4. The ball bearing 14 reduces wear on the cam 10, extending the maintenance cycle. The brush material is made of polyurethane, which combines elasticity and wear resistance, reducing replacement costs. Through the mechanical energy step-by-step conversion of cam 10 → brush plate 20 reciprocating, gear → brush rotation, belt 28 → air pump pressurization, the cleaning of scraping, brushing and blowing is achieved in a coordinated manner. Traditional scraper 8 cannot fit the conveyor belt 4 and the cleaning is incomplete. High-efficiency cleaning is achieved with zero additional energy consumption. At the same time, the risks of deviation, dust explosion hazards and equipment wear are solved, the overall maintenance cost is reduced, and the fully autonomous cleaning of the coal-fired power plant conveyor system is realized.

[0034] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A cleaning scraper structure for the tail end of a coal conveyor belt in a coal-fired power plant, comprising a motor (1), a frame (3), a conveying roller (6), a pump casing (7), a guide rod (19), and a brush plate (20), characterized in that: The frame (3) is rotatably mounted with a conveyor roller (6). A motor (1) is provided on one side of the conveyor roller (6). The motor (1) is connected to the conveyor roller (6) through the output end of the gearbox (2). A cam (10) with a thickness gradually increasing to one side is provided at one end of the conveyor roller (6). A conveyor belt (4) is sleeved on the outer wall of the conveyor roller (6). A brush plate (20) is provided on one side of the conveyor belt (4). A brush plate (22) is provided at one end of the brush plate (20). A sliding sleeve (18) is embedded in the frame (3). A guide rod (19) is provided at both the front and rear ends of the brush plate (20) and is slidably inserted into the sliding sleeve (18). A limit ring (13) is sleeved on the outer wall of the guide rod (19). A spring (16) is sleeved on the outside of the guide rod (19) between the limit ring (13) and the frame (3). A scraper (8) is provided at one end of the frame (3).

2. The cleaning scraper structure at the tail end of a coal conveyor belt in a coal-fired power plant according to claim 1, characterized in that: The limiting ring (13) is provided with a slider (15) at one end, and the frame (3) is provided with a guide rail (17) at one end. The slider (15) is slidably installed on the outer wall of the guide rail (17) at one end.

3. The cleaning scraper structure at the tail end of a coal conveyor belt in a coal-fired power plant according to claim 1, characterized in that: One end of the guide rod (19) is rotatably fitted with a ball bearing (14) that rolls against the inner wall of the cam (10).

4. The cleaning scraper structure at the tail end of a coal conveyor belt in a coal-fired power plant according to claim 1, characterized in that: The frame (3) is rotatably mounted with a brush roller (5). The outer wall of the brush roller (5) is provided with a brush (21) arranged in a ring array and attached to the outer wall of the conveyor roller (6) and the inner wall of the upper end of the conveyor belt (4).

5. The cleaning scraper structure at the tail end of a coal conveyor belt in a coal-fired power plant according to claim 4, characterized in that: The outer wall of the conveying roller (6) is fitted with a gear one (11), and the outer wall of the brush roller (5) is fitted with a gear two (12) that meshes with the gear one (11).

6. The cleaning scraper structure at the tail end of a coal conveyor belt in a coal-fired power plant according to claim 1, characterized in that: A pump casing (7) is provided on the front side of the frame (3). A pump shaft (9) is rotatably installed inside the pump casing (7) inside the front end of the frame (3). An impeller (30) is rotatably installed inside the pump casing (7) on the outer wall of the pump shaft (9). A driven wheel (29) is sleeved on the outer wall of the pump shaft (9). A drive wheel (27) with a radius larger than the driven wheel (29) is sleeved on the outer wall of the conveying roller (6). A belt (28) is sleeved on the outer wall of both the drive wheel (27) and the driven wheel (29).

7. The cleaning scraper structure at the tail end of a coal conveyor belt in a coal-fired power plant according to claim 6, characterized in that: The pump casing (7) has a conveying pipe (25) located inside the conveyor belt (4) at the output end. The lower end of the conveying pipe (25) has two sets of nozzles (26) that are equidistantly distributed and whose outlets are inclined in opposite directions. The frame (3) has a support seat (23) inside. The upper end of the support seat (23) has a pressure ball (24) that is rolled and squeezed against the lower end of the conveyor belt (4).

8. The cleaning scraper structure at the tail end of a coal conveyor belt in a coal-fired power plant according to claim 7, characterized in that: The pump housing (7) is provided with a support ring (31) at the suction end. A pressure ring (33) is provided on one side of the support ring (31). A cylindrical filter screen (32) is provided between the pressure rings (33). A support rod (34) is provided between the pressure rings (33) in a ring array. The support ring (31) and the pressure ring (33) are fixed together by screws.

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