Anti-blocking boiler coal drop pipe of thermal power plant

Abstract

The invention relates to an anti-blocking boiler coal dropping pipe of a thermal power plant. The anti-blocking boiler coal dropping pipe comprises a conveying box, wherein a feeding port in the top and a discharging port in the bottom of the conveying box are staggered; a quantitative cylinder moving between the feeding port and the discharging port is movably connected into the conveying box, an avoiding hole aligned with the feeding port is formed in the bottom of the conveying box, and deformation cloth is arranged in the avoiding hole. By means of the anti-blocking assembly, the inner wall of the falling hopper can be cleaned during coal falling, blockage caused by the fact that coal cinder is stuck, attached and stacked thicker after a long time is avoided, quantitative discharging is achieved through intermittent movement of the quantitative barrel in the conveying box, and the situation that a pipeline is blocked in the coal falling process is prevented. When the quantitative cylinder is filled with coal, the deformation cloth arches upwards and unfolds, when the quantitative cylinder moves to be aligned with the discharging port, the deformation cloth resets downwards, a certain gap is generated in the lower portion of the quantitative cylinder through deformation of the deformation cloth, and the coal flows to the gap under the action of the gravity of the coal, so that blockage clearing is achieved.

Description

Technical Field

[0001] This invention relates to the field of boiler coal chutes technology, specifically to a coal chute for preventing blockage in thermal power plants. Background Technology

[0002] The coal chute in a thermal power plant boiler is a pipe used to transport coal to the boiler furnace. As a key component connecting the coal conveying system and the boiler, the coal chute can efficiently transport coal from the coal storage yard or belt conveyor to the boiler furnace, ensuring a continuous and stable supply of coal to the boiler to meet the boiler's combustion needs, thereby ensuring the continuity and stability of power production. It usually consists of a coal hopper, a downcomer, and a guide trough. Under the action of gravity, coal enters the downcomer from the coal hopper and flows downward along the pipe.

[0003] However, after prolonged use, coal slag will remain on the inner wall of the hopper in the existing coal chute of the thermal power plant boiler. Over time, the coal slag will accumulate and cause blockage. In addition, the existing coal chute cannot limit the flow of coal. During the coal feeding process, the coal will rush down and fill the entire coal chute, which will easily cause blockage and affect the use of the pipeline. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a coal chute for coal-fired boilers in thermal power plants to solve the aforementioned problems.

[0005] This invention provides the following technical solution: A coal chuting pipe for a thermal power plant to prevent blockage includes a conveying box with a top inlet and a bottom outlet that are staggered. The inlet is connected to a hopper and the outlet is connected to a coal chuting pipe. A metering cylinder that moves between the inlet and outlet is movably connected inside the conveying box. An clearance hole aligned with the inlet is provided at the bottom of the conveying box, and a deformable fabric is placed inside the clearance hole. The deformable fabric is driven by a power mechanism to perform the following actions: When the upper and lower openings of the metering cylinder are aligned with the feed inlet and the clearance hole, the deformable fabric arches upward and unfolds. When the upper and lower openings of the metering cylinder are misaligned with the feed inlet and the clearance hole, the deformable fabric is reset downwards to make way.

[0006] Preferably, the bottom of the hopper is provided with a top flange, the inlet at the top of the conveyor box is provided with a bottom flange, a rotating ring is rotatably installed between the top flange and the bottom flange, and an anti-blocking component is provided on the rotating ring.

[0007] Preferably, the anti-blocking component includes a fixed block installed on the inner wall of the rotating ring. The top of the fixed block is provided with a mounting shell extending into the hopper. A insertion groove is provided on one side of the mounting shell. A rod is detachably inserted into the insertion groove. A mounting plate is provided on the top of the rod. A scraper is installed on one side of the mounting plate. Multiple stirring rods are installed on the other side of the mounting plate. The scraper is in contact with the inner wall of the hopper.

[0008] Preferably, a through threaded hole is provided between the corresponding insertion rod and the mounting shell, and a lead screw is threaded into the internal thread of the threaded hole, with a knob fixedly installed at one end of the lead screw.

[0009] Preferably, the circumferential surface of the rotating ring is provided with meshing teeth, and it also includes an output motor. The output end of the output motor is provided with a transmission gear, and the meshing teeth and the transmission gear are connected by a toothed belt drive.

[0010] Preferably, the transmission gear is coaxially provided with a coaxial gear and also includes a reciprocating motion block. The reciprocating motion block has meshing grooves on both opposite sides inside. The meshing grooves are meshed with the coaxial gear. The coaxial gear has an incomplete tooth structure and alternately meshes with the two sets of meshing grooves. The reciprocating motion block is connected to the conveyor box.

[0011] Preferably, the side wall of the conveying box is provided with a sliding groove, which slides in conjunction with the metering cylinder; the side wall of the reciprocating block is provided with a second connecting column, and the side wall of the metering cylinder is provided with a first connecting column, and the first connecting column and the second connecting column are connected by a connecting rod.

[0012] Preferably, the metering cylinder includes a perforated part and a shielding part that are integrated together. When the perforated part is connected to the discharge port, the shielding part closes the inlet port. The side wall of the conveying box has an inlet and outlet for the shielding part to extend to the outside.

[0013] Preferably, the power mechanism includes an intermediate block disposed at the center of the clearance hole, and a sliding rod is uniformly disposed circumferentially around the clearance hole on the outer wall of the conveying box. The sliding rod slides radially along the clearance hole, and the sliding rod and the intermediate block are connected by corresponding connecting rods. The center of the deformable fabric is connected to the intermediate block.

[0014] Preferably, the outer wall of the conveyor box is hinged with a linkage rod. When the perforated part is aligned with the feed inlet, the linkage rod is rotated by the abutment of the blocking part and one end of the linkage rod. The other end of the linkage rod pushes the abutting intermediate block to move inward along the clearance hole axis. The linkage rod is reset by a return spring.

[0015] The present invention has the following beneficial technical effects: This invention uses an anti-clogging component to clean the inner wall of the hopper during coal feeding, preventing coal slag from adhering and accumulating over time and causing blockages. In addition, the stirring rod agitates the coal inside the hopper to prevent it from piling up and becoming difficult to feed. The metering cylinder inside the conveying box moves intermittently to achieve metered feeding, preventing coal from rushing down during the coal feeding process and filling the entire coal feeding pipe, thus causing pipe blockage.

[0016] This invention achieves unblocking by causing a deformable cloth to arch upwards and unfold when coal is loaded into the metering cylinder, and then returning to its original position downwards when the metering cylinder is aligned with the discharge port. The deformation of the deformable cloth creates a certain gap at the bottom of the metering cylinder, and the coal tends to flow into this gap under its own weight. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial front view of the present invention; Figure 3 This is a schematic diagram of the transmission component of the present invention; Figure 4 This is a schematic diagram of the reciprocating motion block and coaxial gear of the present invention; Figure 5 This is a schematic diagram showing the assembly of the material hopper, top flange, and bottom flange of the present invention. Figure 6 This is a schematic diagram of the structure when the metering cylinder and the discharge port of the present invention are aligned; Figure 7 This is a schematic diagram of the anti-clogging component of the present invention; Figure 8 This is a schematic diagram showing the mating of the mounting shell and mounting plate of the present invention; Figure 9 This is a schematic diagram of the clearance hole and its mating components of the present invention; Figure 10 for Figure 9 A magnified view of part A; Figure 11 This is a schematic diagram of the metering cylinder structure of the present invention.

[0018] The attached figures are labeled as follows: 1. Coal chute; 2. Control panel; 3. Conveyor box; 4. Feed inlet; 5. Discharge outlet; 6. Sliding chute; 7. Metering cylinder; 8. First connecting column; 9. Connecting rod; 10. Sliding plate; 11. Second connecting column; 12. Reciprocating block; 13. Through groove; 14. Meshing groove; 15. Coaxial gear; 16. Connecting rod; 17. Transmission gear; 18. Rotating shaft; 19. Output motor; 20. Fixed plate; 21. Feed hopper; 22. Rotating ring; 3. Engaging teeth; 24. Top flange; 25. Bottom flange; 26. Toothed belt; 27. Fixing block; 28. Mounting shell; 29. ​​Insertion groove; 30. Insert rod; 31. Mounting plate; 32. Stirring rod; 33. Scraper; 34. Lead screw; 35. Knob; 36. Clearance hole; 37. Linkage rod; 38. Return spring; 39. Inlet and outlet; 40. Intermediate block; 41. Connecting rod; 42. Slide rod; 43. Slider; 71. Perforated part; 72. Shielding part. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: A type of anti-clogging boiler coal chute in thermal power plants, such as Figures 1-11 As shown: It includes a coal chute 1, a hopper 21, and a conveyor box 3. A control panel 2 is fixedly installed on the front of the coal chute 1. The anti-blocking operation of the pipeline can be started through the control panel 2 on the front of the coal chute 1, and the output motor 19 can be started through the control panel 2.

[0021] The conveying box 3 is fixedly connected to the top of the coal falling pipe 1. The top and bottom of the conveying box 3 are respectively provided with staggered feed inlets 4 and discharge outlets 5. Sliding grooves 6 are provided on both sides of the conveying box 3. A metering cylinder 7 is slidably installed inside the conveying box 3. The metering cylinder 7 can slide inside the conveying box 3. When the metering cylinder 7 slides to the leftmost side inside the conveying box 3, it connects with the feed inlet 4 of the conveying box 3. When the metering cylinder 7 slides to the rightmost side inside the conveying box 3, it connects with the discharge outlet 5 of the conveying box 3 to discharge material.

[0022] The metering cylinder 7 includes a perforated part 71 and a blocking part 72 that are integrated together. When the perforated part 71 is connected to the discharge port 5, the blocking part 72 closes the inlet port 4. The side wall of the conveying box 3 is provided with an inlet and outlet 39 for the blocking part 72 to extend to its outside. It also includes a top flange 24 and a bottom flange 25. The top flange 24 is fixedly connected to the bottom of the hopper 21, and the bottom flange 25 is fixedly connected to the top of the conveying box 3. The hopper 21 is fixedly set relative to the ground. A rotating ring 22 is rotatably installed between the top flange 24 and the bottom flange 25. The outer circumferential surface of the rotating ring 22 is provided with meshing teeth 23. Through the top flange 24 and the bottom flange 25 at both ends of the rotating ring 22, the feed inlet 4 of the conveying box 3 is connected to the bottom of the hopper 21. When coal is falling, the coal enters the metering cylinder 7 inside the conveying box 3 along the bottom of the hopper 21.

[0023] Two fixing blocks 27 are symmetrically installed on the inner wall of the rotating ring 22. A mounting shell 28 is fixedly installed on the top of the fixing blocks 27. The mounting shell 28 has an insertion groove 29 inside. An insertion rod 30 is slidably installed inside the insertion groove 29. A through threaded hole is opened between the corresponding insertion rod 30 and the mounting shell 28. A screw rod 34 is threadedly connected inside the threaded hole. A knob 35 is fixedly installed at one end of the screw rod 34. When the insertion rod 30 is fully slidably installed inside the insertion groove 29, the threaded holes of the two are aligned. At this time, by rotating the knob 35, the screw rod 34 is driven to connect the two threadedly, so that the insertion rod 30 and the mounting shell 28 can be fixed.

[0024] The anti-blocking assembly includes two mounting plates 31, which are fixedly installed on the top of two insert rods 30 respectively. A scraper 33 is fixedly installed on one side of the mounting plate 31, and two stirring rods 32 are fixedly installed on the other side of the mounting plate 31. The scraper 33 is in contact with the inner wall of the hopper 21. A fixed plate 20 is fixedly installed on the outside of the hopper 21. An output motor 19 is installed on the fixed plate 20. A rotating shaft 18 is provided at the output end of the output motor 19. The output motor 19 is started by the control panel 2, which drives the rotating shaft 18 fixedly connected to the output end to rotate. A transmission gear 17 is coaxially installed on the rotating shaft 18. The transmission gear 17 and the meshing teeth 23 on the outer wall of the rotating ring 22 are transmitted through a toothed belt 26.

[0025] When the rotating shaft 18 rotates, it drives the transmission gear 17 fixedly connected to the bottom to rotate. When the transmission gear 17 rotates, it meshes with the toothed belt 26, which drives the rotating ring 22 to rotate between the top flange 24 and the bottom flange 25. When the rotating ring 22 rotates, it drives the two fixed blocks 27 on the inner side to rotate synchronously. When the two fixed blocks 27 rotate, they drive the insertion rod 30 and the mounting plate 31 fixedly connected to them to rotate synchronously through the mounting shell 28. The stirring rod 32 fixedly installed on one side of the mounting plate 31 stirs the coal inside the hopper 21, and the scraper 33 fixedly installed on the other side of the mounting plate 31 scrapes and cleans the inside of the hopper 21 to prevent accumulation and blockage.

[0026] It also includes a connecting rod 16, which is coaxially fixedly installed at the bottom of the transmission gear 17. A coaxial gear 15 is fixedly installed at the lower end of the connecting rod 16. The coaxial gear 15 has an incomplete tooth structure. It also includes a reciprocating block 12 and a sliding plate 10. The top of the reciprocating block 12 has a through groove 13. Both sides of the inside of the hopper 21 have meshing grooves 14. The through grooves 13 are slidably connected to the connecting rod 16. At any given time, the coaxial gear 15 will only mesh with one of the meshing grooves 14. The sliding plate 10 is fixedly installed at one end of the conveying box 3. The reciprocating block 12 is slidably connected to the outside of the sliding plate 10. Second connecting columns 11 are fixedly installed on both sides of the reciprocating block 12. A connecting rod 9 is fixedly installed at one end of each of the two second connecting columns 11. A first connecting column 8 is fixedly installed at one end of each of the two connecting rods 9. The two first connecting columns 8 are respectively fixedly installed on both sides of the metering cylinder 7. The column 8 is slidably connected to the two sliding grooves 6 respectively. When the transmission gear 17 rotates, the connecting rod 16 fixedly connected to the bottom drives the coaxial gear 15 to rotate synchronously. When the coaxial gear 15 rotates, the teeth of the coaxial gear 15 mesh with the meshing groove 14 inside the reciprocating block 12, so that the reciprocating block 12 slides back and forth inside the sliding plate 10. When the reciprocating block 12 reciprocates, the two second connecting columns 11 drive the two first connecting columns 8 to move. The two first connecting columns 8 move synchronously inside the two sliding grooves 6 respectively, driving the fixedly connected metering cylinder 7 to slide back and forth inside the conveying box 3 for repeated metering.

[0027] Coal falls into the hopper 21 via a pre-arranged conveyor system. After passing through the conveyor box 3 at the bottom of the hopper 21, it falls into the coal discharge pipe 1, completing the coal discharge process. During discharge, the output motor 19 is activated via the control panel 2 to prevent pipe blockage. The output motor 19 drives the rotating ring 22 to rotate between the top flange 24 and the bottom flange 25, causing the stirring rod 32 fixedly installed on one side of the mounting plate 31 to stir the coal inside the hopper 21, aiding in the discharge. Meanwhile, the scraper 33 fixedly installed on the other side of the mounting plate 31 scrapes and cleans the inside of the hopper 21. To prevent accumulation and blockage, the metering cylinder 7 slides back and forth inside the conveying box 3. When the metering cylinder 7 slides to the leftmost side inside the conveying box 3, it connects with the feed inlet 4 of the conveying box 3 to receive the material falling from the hopper 21. Then, when the metering cylinder 7 slides to the rightmost side inside the conveying box 3, it connects with the discharge outlet 5 of the conveying box 3 to discharge material. This intermittent metering of coal prevents excessive coal discharge from causing blockage. When the stirring rod 32 and scraper 33 are damaged and need to be replaced, the knob 35 is turned to disassemble the lead screw 34, thereby releasing the fixed connection between the insert rod 30 and the mounting shell 28 for replacement.

[0028] The bottom of the conveyor box 3 is provided with a clearance hole 36 coaxial with the feed inlet 4. The clearance hole 36 is blocked by a deformable cloth (not shown in the attached figure). The left side wall of the conveyor box 3 is provided with an inlet and outlet 39. The inlet and outlet 39 are adapted to the blocking part 72 of the metering cylinder 7. The blocking part 72 of the metering cylinder 7 extends to the outside of the conveyor box 3 through the inlet and outlet 39. A linkage rod 37 is hinged to the outer wall of the conveyor box 3. The linkage rod 37 has an L-shaped structure. The left end of the linkage rod 37 is located on the side of the conveyor box 3 with the inlet and outlet 39, and the right end of the linkage rod 37 is located below the clearance hole 36.

[0029] The bottom of the conveyor box 3 is slidably connected to multiple slide rods 42 via sliders 43. The slide rods 42 are arranged in a ring around the clearance hole 36. The slide rods 42 slide radially relative to each other along the clearance hole 36. The conveyor box 3 also includes an intermediate block 40 that moves axially along the clearance hole 36. The intermediate block 40 is positioned relative to the center of the clearance hole 36. The two ends of the connecting rod 41 are hinged to the intermediate block 40 and the slide rods 42 respectively. The intermediate block 40 moves axially along the clearance hole 36, which drives the slide rods 42 to move radially through the connecting rod 41.

[0030] The outer edge of the deformable cloth is fixedly connected to the side wall of the clearance hole 36, and the center of the deformable cloth is fixed to the upper end of the intermediate block 40. The intermediate block 40, the connecting rod 41 and the sliding rod 42 are blocked by the deformable cloth and will not communicate with the perforated part 71 of the metering cylinder 7. The lower end of the intermediate block 40 can be connected to the right end of the linkage rod 37 through a pull rope for linkage.

[0031] When the perforated portion 71 of the metering cylinder 7 moves from the outlet 5 to the inlet 4, the blocking portion 72 has not yet touched the left end of the linkage rod 37. At this time, the linkage rod 37 moves to the left end under the action of the return spring 38. Figure 9 In this state, the middle block 40 moves downward along the clearance hole 36 to the lower limit. When the perforated section 71 of the metering cylinder 7 is half aligned with the feed inlet 4, the blocking part 72 touches the left end of the linkage rod 37. The metering cylinder 7 continues to move until the perforated section 71 is completely aligned with the feed inlet 4. During this process, the linkage rod 37 is pushed to rotate and move by an angle. The linkage rod 37 pushes the middle block 40 to move upward along the clearance hole 36 to the upper limit position (relatively inserted into the lower end of the perforated section 71) through the right end. The upward movement of the middle block 40 causes the deformed cloth to arch upward. At this time, coal enters the perforated section 71 of the metering cylinder 7, and multiple connecting rods 41 provide support for the deformed cloth. Afterwards, when the perforated part 71 of the metering cylinder 7 moves to the discharge port 5, the reset spring 38 drives the linkage rod 37 to rotate and reset, and the intermediate block 40 moves downward and resets, so that the deformable cloth resets downward and disengages from the lower opening of the perforated part 71. The deformable cloth arches upward and disengages, forming a gap in the lower end of the perforated part 71. This gap is similar to a cone-shaped structure with the tip pointing upward. Under the action of the coal's own gravity, the coal tends to flow towards this gap, so that the coal in the perforated part 71 can flow. Thus, when the perforated part 71 is aligned with the discharge port 5, the flowing coal can quickly flow out of the discharge port 5 and avoid blockage.

[0032] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A coal chute for an anti-clogging boiler in a thermal power plant, characterized in that, The conveying box (3) includes a top feed inlet (4) and a bottom discharge outlet (5) that are staggered. The feed inlet (4) is connected to the dropping hopper (21), and the discharge outlet (5) is connected to the coal dropping pipe (1). The conveying box (3) is movably connected to a metering cylinder (7) that moves between the inlet (4) and the outlet (5). The bottom of the conveying box (3) is provided with a clearance hole (36) aligned with the inlet (4). A deformable fabric is provided in the clearance hole (36). The deformable fabric is driven by a power mechanism to perform the following actions: When the upper and lower openings of the metering cylinder (7) are aligned with the feed inlet (4) and the clearance hole (36), the deformable fabric arches upward and unfolds. When the upper and lower openings of the metering cylinder (7) are misaligned with the feed inlet (4) and the clearance hole (36), the deformable cloth is reset downwards to make way.

2. The anti-blocking coal chute for a thermal power plant boiler according to claim 1, characterized in that, The bottom of the hopper (21) is provided with a top flange (24), and the feed inlet (4) at the top of the conveying box (3) is provided with a bottom flange (25). A rotating ring (22) is rotatably installed between the top flange (24) and the bottom flange (25), and an anti-blocking component is provided on the rotating ring (22).

3. A coal chute for an anti-blocking boiler in a thermal power plant according to claim 2, characterized in that, The anti-blocking component includes a fixing block (27) installed on the inner wall of the rotating ring (22). The top of the fixing block (27) is provided with an installation shell (28) extending into the hopper (21). A plug-in groove (29) is provided on one side of the installation shell (28). A plug rod (30) is detachably plugged into the plug-in groove (29). An installation plate (31) is provided on the top of the plug rod (30). A scraper (33) is installed on one side of the installation plate (31). Multiple stirring rods (32) are installed on the other side of the installation plate (31). The scraper (33) is in contact with the inner wall of the hopper (21).

4. A coal chute for an anti-blocking boiler in a thermal power plant according to claim 3, characterized in that, A through threaded hole is provided between the corresponding insertion rod (30) and the mounting shell (28), and a lead screw (34) is threadedly connected inside the threaded hole. A knob (35) is fixedly installed at one end of the lead screw (34).

5. A coal chute for an anti-blocking boiler in a thermal power plant according to claim 2, characterized in that, The rotating ring (22) has meshing teeth (23) on its circumferential surface and also includes an output motor (19). The output end of the output motor (19) is provided with a transmission gear (17). The meshing teeth (23) and the transmission gear (17) are connected by a toothed belt (26).

6. A coal chute for an anti-blocking boiler in a thermal power plant according to claim 5, characterized in that, The transmission gear (17) is coaxially provided with a coaxial gear (15) and also includes a reciprocating block (12). The reciprocating block (12) has meshing grooves (14) on both opposite sides inside. The meshing grooves (14) mesh with the coaxial gear (15). The coaxial gear (15) has an incomplete tooth structure and meshes alternately with the two sets of meshing grooves (14). The reciprocating block (12) is connected to the conveyor box (3).

7. A coal chute for an anti-clogging boiler in a thermal power plant according to claim 6, characterized in that, The side wall of the conveying box (3) is provided with a sliding groove (6), which is slidably engaged with the metering cylinder (7); the side wall of the reciprocating block (12) is provided with a second connecting column (11), and the side wall of the metering cylinder (7) is provided with a first connecting column (8). The first connecting column (8) and the second connecting column (11) are connected by a connecting rod (9).

8. A coal chute for an anti-blocking boiler in a thermal power plant according to claim 1, characterized in that, The metering cylinder (7) includes a perforated part (71) and a shielding part (72) that are integrated together. When the perforated part (71) is connected to the discharge port (5), the shielding part (72) closes the feed port (4). The side wall of the conveying box (3) is provided with an inlet and outlet (39) for the shielding part (72) to extend to its outside.

9. A coal chute for an anti-blocking boiler in a thermal power plant according to claim 8, characterized in that, The power mechanism includes an intermediate block (40) located at the center of the clearance hole (36). The outer wall of the conveying box (3) is uniformly provided with slide rods (42) around the clearance hole (36). The slide rods (42) slide radially along the clearance hole (36). The slide rods (42) and the intermediate block (40) are connected by corresponding connecting rods (41). The center of the deformable fabric is connected to the intermediate block (40).

10. A coal chute for an anti-blocking boiler in a thermal power plant according to claim 9, characterized in that, The outer wall of the conveying box (3) is hinged with a linkage rod (37). When the perforated part (71) is aligned with the feed inlet (4), the linkage rod (37) is rotated by the blocking part (72) abutting against one end of the linkage rod (37). The other end of the linkage rod (37) pushes the abutting middle block (40) to move axially inward along the clearance hole (36). The linkage rod (37) is pushed back to its original position by the return spring (38).

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