Powder feeding device of coal injection machine

Abstract

The invention relates to the technical field of coal injection machine powder feeding, and discloses a coal injection machine powder feeding device which comprises a bottom plate used for supporting a coal injection structure and made of a high-strength steel plate, a fixing frame used for being connected with the structure and providing power, a linkage shaft fixedly installed at the output end of a first motor, and a rotating shaft arranged at the right end of the linkage shaft and used for rotating the linkage shaft. The rotating shaft is used for transmitting power, and the scrapers are arranged on the outer side of the rotating shaft in a circumferential array mode and used for generating flowing airflow. According to the powder feeding device of the coal injection machine, the fans controlled by the two power sources are adopted for driving feeding, grinding and spraying, the production cost is effectively reduced, meanwhile, after the structure is simplified, the number of parts is reduced, the shutdown time caused by equipment maintenance is shortened, the production efficiency is improved, the rotating speed of the fans is consistent with the grinding speed, the grinding process is more stable, and the production efficiency is improved. The material spraying uniformity is improved, sufficient combustion of fuel such as coal is facilitated, the combustion efficiency is improved, and compared with a traditional coal spraying machine, the combustion efficiency can be improved by 20% or above.

Description

Technical Field

[0001] The present invention relates to the technical field of coal powder feeding for coal pulverizers, and specifically to a coal powder feeding device for a coal pulverizer. Background Art

[0002] In the industrial production field, coal pulverizers are commonly used to grind solid fuels such as coal into powder and transport it to combustion equipment through wind power to achieve efficient combustion, and are widely used in heat supply equipment such as boilers and kilns.

[0003] Traditional coal pulverizers generally adopt a split structure design. However, this design results in a large overall structure of the equipment, and complex pipelines and mechanical transmission components are required to connect between various devices, occupying a large amount of installation space. At the same time, the primary crushing, secondary grinding, and pneumatic conveying all adopt independent power systems, with high energy consumption and large equipment operation costs. Moreover, the multi-stage structure increases the number of failure points. Once a certain stage of the device fails, it is difficult to repair, which will cause the entire coal pulverizer to stop and affect production continuity. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a coal powder feeding device for a coal pulverizer to solve the problems mentioned in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A coal powder feeding device for a coal pulverizer, comprising: A bottom plate for supporting the coal pulverizing structure, and the bottom plate is made of high-strength steel plate; A fixed frame for connecting the structure, and the fixed frame is fixedly welded to the top of the bottom plate; A first motor for providing power, and the first motor is fixedly installed at the top end of the fixed frame; A conveying frame for ejecting coal powder, and the conveying frame is fixedly installed on the right side of the fixed frame; A linkage shaft for transmitting power to the inside of the conveying frame, and the linkage shaft is fixedly installed at the output end of the first motor; A rotating shaft arranged at the right end of the linkage shaft for transmitting power; A plurality of scraping plates arranged in a circumferential array outside the rotating shaft for generating a flowing air current; A sieve plate for screening coal powder, and the sieve plate is rotatably connected to the inside of the conveying frame; A plurality of coal powder spraying holes for the flow of coal powder, and the plurality of coal powder spraying holes are opened outside the sieve plate; A plurality of positive crushing teeth for crushing coal blocks, and the plurality of positive crushing teeth are fixedly welded to the right side of the sieve plate; A collar for cooperating with the positive crushing teeth to crush coal blocks, and the collar is fixedly installed on the right side of the conveying frame; Multiple anti-crushing teeth are used to cooperate with the positive crushing teeth to crush coal blocks, and the multiple anti-crushing teeth are arranged inside the collar; A sieve mesh is used to screen the pulverized coal powder, and the sieve mesh is fixedly installed inside the collar; A material guide pipe is used for guiding materials, and the material guide pipe is fixed to the right side of the collar by bolts; A pressure boosting pipe is used to increase the air pressure inside the collar and the conveying frame, and the pressure boosting pipe is connected and arranged inside the material guide pipe; A second motor is used to provide power, and the second motor is fixedly installed outside the material guide pipe; A storage hopper is used to temporarily store coal blocks, and the storage hopper is connected and arranged inside the material guide pipe; A screw conveyor main body is used to push the coal blocks to move, and the screw conveyor main body is arranged inside the material guide pipe.

[0006] Preferably, the output end of the second motor penetrates through the inside of the diversion pipe, and the right end of the output end of the second motor is fixedly connected to the screw conveyor main body. The second motor is a servo motor and receives external instructions (such as 0-10V or PWM signals).

[0007] Preferably, the outer wall of the rotating shaft is fixedly connected to the axis of the sieve plate, and the outside of the sieve mesh is movably attached to the outside of the sieve plate.

[0008] Preferably, the multiple positive crushing teeth are arranged inside the multiple anti-crushing teeth. One end of the material guide pipe away from the storage hopper penetrates through the inside of the collar and extends to the inside of the multiple anti-crushing teeth.

[0009] Preferably, powder spraying pipes are arranged on both sides of the conveying frame, and the two powder spraying pipes are arranged one above the other.

[0010] Preferably, the diameter of the mesh holes opened on the sieve mesh is 50um-70um.

[0011] Preferably, an industrial blower is externally connected to the pressure boosting pipe. The pressure boosting pipe is inclined and faces downward.

[0012] Preferably, the side of the powder spraying pipe away from the conveying frame is designed with a tapered structure, and the sieve mesh is arranged inside the coal spraying holes.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. The coal feeder device of this coal pulverizer uses two power source-controlled fans to drive the feeding, grinding, and spraying, effectively reducing the production cost. At the same time, after the structure is simplified, the number of components is reduced, the downtime of the equipment caused by maintenance is reduced, and the production efficiency is improved. Moreover, the fan speed is consistent with the grinding speed, making the grinding process more stable, improving the spraying uniformity, facilitating the full combustion of fuels such as coal, and enhancing the combustion efficiency. Compared with traditional coal pulverizers, the combustion efficiency can be increased by more than 20%.

[0014] 2. The coal feeder device of this coal pulverizer has the motor two as a servo motor, which can achieve different speeds by receiving different external instructions, and can achieve the effect of adjusting the feeding speed. The effect of controlling the feeding speed can be achieved by controlling the rotation speed of the motor two. Brief Description of the Drawings

[0015] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention; Figure 2 It is a side view schematic diagram of the structure of the present invention; Figure 3 It is a front view sectional schematic diagram of the structure of the present invention; Figure 4 It is a three-dimensional schematic diagram of the collar and its related structure of the present invention; Figure 5 It is a schematic diagram of the sieve plate of the present invention; Figure 6 It is a side view sectional schematic diagram of the conveying frame of the present invention; Figure 7 It is a three-dimensional schematic diagram of the conveying frame and its related structure of the present invention.

[0016] In the figure: 1. Bottom plate; 2. Fixed frame; 3. Motor one; 4. Conveying frame; 5. Linkage shaft; 6. Rotating shaft; 7. Scraper; 8. Sieve plate; 9. Coal spraying hole; 10. Positive crushing teeth; 11. Collar; 12. Reverse crushing teeth; 13. Sieve mesh; 14. Guide pipe; 15. Booster pipe; 16. Motor two; 17. Storage hopper; 18. Auger main body. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment: Please refer to FIGS. 1-7 in combination, A coal feeder device of a coal pulverizer includes: The bottom plate 1 is used to support the pulverized coal injection structure and is made of high-strength steel plate; The fixed frame 2 is used for connecting the structure and is fixedly welded to the top of the bottom plate 1; The first motor 3 is used to provide power and is fixedly installed at the top end of the fixed frame 2; The conveying frame 4 is used to spray pulverized coal and is fixedly installed on the right side of the fixed frame 2; The linkage shaft 5 is used to transmit power to the inside of the conveying frame 4 and is fixedly installed at the output end of the first motor 3; The rotating shaft 6 is arranged at the right end of the linkage shaft 5 and is used to transmit power; A number of scraper plates 7 are arranged in a circumferential array outside the rotating shaft 6 and are used to generate a flowing air current; The sieve plate 8 is used to screen pulverized coal and is rotatably connected to the inside of the conveying frame 4; A plurality of pulverized coal injection holes 9 are used for the circulation of pulverized coal and are opened outside the sieve plate 8; A plurality of positive crushing teeth 10 are used to crush coal blocks and are fixedly welded to the right side of the sieve plate 8; The collar 11 is used to cooperate with the positive crushing teeth 10 to crush coal blocks and is fixedly installed on the right side of the conveying frame 4; A plurality of reverse crushing teeth 12 are used to cooperate with the positive crushing teeth 10 to crush coal blocks and are arranged inside the collar 11; The sieve mesh 13 is used to screen the pulverized coal after crushing and is fixedly installed inside the collar 11; The material guiding pipe 14 is used for guiding materials and is fixed to the right side of the collar 11 by bolts; The pressurizing pipe 15 is used to increase the air pressure inside the collar 11 and the conveying frame 4 and is communicated and arranged inside the material guiding pipe 14; The second motor 16 is used to provide power and is fixedly installed outside the material guiding pipe 14; The storage hopper 17 is used to temporarily store coal blocks and is communicated and arranged inside the material guiding pipe 14; The auger main body 18 is used to push the coal blocks to move and is arranged inside the material guiding pipe 14; Specifically, before crushing the coal blocks, the coal blocks are placed inside the storage hopper 17. Under the action of gravity and external force applied by personnel, the coal blocks are squeezed into the inside of the material guiding pipe 14. The second motor 16 is started, and the second motor 16 will drive the auger main body 18 to rotate. When used in conjunction with the material guiding pipe 14, the coal blocks can be input into the inside of the collar 11, and then the effect of conveying the coal blocks is completed. Since the second motor 16 is a servo motor, it can achieve different rotational speeds by receiving different external instructions, and can achieve the effect of adjusting the feeding speed. After the first motor 3 is started, it drives the linkage shaft 5 to rotate. The linkage shaft 5 will drive the rotating shaft 6 to rotate. The rotating shaft 6 drives the sieve plate 8 to rotate. The sieve plate 8 will drive the positive crushing teeth 10 to rotate. In cooperation with the anti-crushing teeth 12 inside the collar 11, the coal blocks inside the collar 11 are ground and crushed, and then screened by the sieve mesh 13 to achieve the effect of screening pulverized coal. The industrial blower inputs high-pressure air into the booster pipe 15. The high-pressure air enters the inside of the collar 11. Driven by the air, the pulverized coal will enter the inside of the coal spraying holes 9, and then the pulverized coal enters the inside of the conveying frame 4. The scraper 7 rotates at a high speed driven by the rotating shaft 6, generating flowing air, and spraying the pulverized coal through the powder spraying pipes at both ends to achieve the effect of coal spraying. This device uses a blower driven by two power sources to control feeding, grinding, and spraying. Compared with traditional coal sprayers with multiple power sources, the energy consumption can be reduced by more than 35%, effectively reducing the production cost. At the same time, after the structure is simplified, the number of components is reduced, the installation process is simpler, it is easier to troubleshoot fault points during maintenance, the maintenance time can be shortened by 80%, the downtime of the equipment caused by maintenance is reduced, and the production efficiency is improved. Moreover, the rotational speed of the blower is consistent with the grinding speed, making the grinding process more stable, improving the uniformity of coal spraying, being conducive to the full combustion of fuels such as coal, and improving the combustion efficiency. Compared with traditional coal sprayers, the combustion efficiency can be increased by more than 20%; In the embodiment: the output end of the second motor 16 is disposed through the inside of the diversion pipe, and the right end of the output end of the second motor 16 is fixedly connected to the auger main body 18. The second motor 16 is a servo motor and receives external instructions such as 0 - 10V or PWM signals; Specifically, the second motor 16 is fixedly connected to the auger main body 18, which can achieve the effect of driving the auger main body 18 to rotate. When the auger main body 18 rotates, it can generate a thrust, which can push the coal blocks falling into the inside of the material guiding pipe 14 to the right, and finally cooperate with the high-pressure gas in the booster pipe 15 to input the coal blocks into the inside of the collar 11; In the embodiment: the outer wall of the rotating shaft 6 is fixedly connected to the center of the sieve plate 8, and the outside of the sieve mesh 13 is movably attached to the outside of the sieve plate 8; Specifically, the outer wall of the rotating shaft 6 is fixedly connected to the center of the sieve plate 8 to achieve the effect of driving the sieve plate 8 to rotate inside the conveying frame 4. The rotation of the sieve plate 8 can drive the positive crushing teeth 10 to rotate, achieving the effect of rotating and crushing the coal blocks; In an embodiment: A plurality of positive crushing teeth 10 are arranged inside a plurality of reverse crushing teeth 12. One end of the material guiding pipe 14 away from the storage hopper 17 is disposed through the inside of the collar 11 and extends to the inside of the plurality of reverse crushing teeth 12; Specifically, a plurality of positive crushing teeth 10 are arranged inside a plurality of reverse crushing teeth 12. The positive crushing teeth 10 and the reverse crushing teeth 12 can achieve the effect of evenly grinding and extruding coal blocks, and can achieve the effect of crushing coal blocks. The material guiding pipe 14 is arranged inside the collar 11, and can convey coal blocks into the inside of the conveying frame 4, and then the positive crushing teeth 10 and the reverse crushing teeth 12 perform extrusion and crushing to achieve the effect of crushing coal blocks; In an embodiment: Powder spraying pipes are arranged on both sides of the conveying frame 4, and the two powder spraying pipes are arranged one above the other; Specifically, powder spraying pipes are arranged on both sides of the conveying frame 4, and the powder spraying pipes are arranged one above the other, which can better transfer the pulverized coal and achieve the effect of supplying pulverized coal; In an embodiment: The diameter of the mesh holes opened on the screen 13 is 50um - 70um; Specifically, the diameter range of the mesh holes on the screen 13 can be between 50um - 70um, which meets the coal spraying requirements of the coal pulverizer; In an embodiment: The booster pipe 15 is externally connected to an industrial blower. The booster pipe 15 is inclined and faces downward; Specifically, the booster pipe 15 is externally connected to an industrial blower to achieve the effect of providing high-pressure and high-speed flowing air. The booster pipe 15 is inclined, which can better transfer high-pressure air; In an embodiment: The side of the powder spraying pipe away from the conveying frame 4 is designed with a tapered structure. The screen 13 is arranged inside the coal spraying hole 9; Specifically, the side of the powder spraying pipe away from the conveying frame 4 is tapered, which can better gather the output air and pulverized coal, and can increase the air flow rate. The screen 13 is arranged inside the coal spraying hole 9, which can better filter the pulverized coal after coal grinding; In an embodiment: The first motor 3, the second motor 16 and the industrial blower are of existing structures, and the control circuit can be realized by simple programming by those skilled in the art, which belongs to the common knowledge in the art. Only its use is carried out without modification, so the control method and circuit connection will not be described in detail.

[0019] Working principle: The second motor 16 drives the auger main body 18 to rotate, and inputs coal blocks into the inside of the collar 11. The first motor 3 drives the rotating shaft 6 to rotate, driving the positive crushing teeth 10 to rotate. After being screened by the screen 13, the industrial blower inputs high-pressure air into the booster pipe 15. The air drives the pulverized coal into the coal spraying hole 9. The pulverized coal enters the conveying frame 4 and is ejected through the powder spraying pipes at both ends to achieve the effect of coal spraying; The device uses two fans driven by variable frequency drives of power sources to drive feeding, grinding, and spraying, effectively reducing production costs. At the same time, after the structure is simplified, the number of components is reduced, the downtime of the equipment caused by maintenance is reduced, and the production efficiency is improved. Moreover, the fan speed is consistent with the grinding speed, making the grinding process more stable, improving the spraying uniformity, facilitating the full combustion of fuels such as coal, and improving the combustion efficiency. Compared with traditional coal pulverizers, the combustion efficiency can be increased by more than 20%.

[0020] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pulverized coal feeder device for a coal pulverizer, characterized in that, Including: A bottom plate (1) for supporting the coal injection structure, and the bottom plate (1) is made of high-strength steel plate; A fixed frame (2) for connecting the structure, and the fixed frame (2) is fixedly welded on the top of the bottom plate (1); A first motor (3) for providing power, and the first motor (3) is fixedly installed at the top end of the fixed frame (2); A conveying frame (4) for ejecting pulverized coal, and the conveying frame (4) is fixedly installed on the right side of the fixed frame (2); A linkage shaft (5) for transmitting power to the inside of the conveying frame (4), and the linkage shaft (5) is fixedly installed at the output end of the first motor (3); A rotating shaft (6) arranged at the right end of the linkage shaft (5) for transmitting power; A plurality of scraper plates (7) arranged in a circumferential array outside the rotating shaft (6) for generating a flowing air current; A sieve plate (8) for screening pulverized coal, and the sieve plate (8) is rotatably connected to the inside of the conveying frame (4); A plurality of coal injection holes (9) for the pulverized coal to flow through, and the plurality of coal injection holes (9) are opened outside the sieve plate (8); A plurality of positive crushing teeth (10) for crushing coal blocks, and the plurality of positive crushing teeth (10) are fixedly welded on the right side of the sieve plate (8); A collar (11) for cooperating with the positive crushing teeth (10) to crush coal blocks, and the collar (11) is fixedly installed on the right side of the conveying frame (4); A plurality of reverse crushing teeth (12) for cooperating with the positive crushing teeth (10) to crush coal blocks, and the plurality of reverse crushing teeth (12) are arranged inside the collar (11); A sieve mesh (13) for screening the pulverized coal after crushing, and the sieve mesh (13) is fixedly installed inside the collar (11); A material guiding pipe (14) for guiding materials, and the material guiding pipe (14) is fixed to the right side of the collar (11) by bolts; A pressure increasing pipe (15) for increasing the air pressure inside the collar (11) and the conveying frame (4), and the pressure increasing pipe (15) is communicated and arranged inside the material guiding pipe (14); A second motor (16) for providing power, and the second motor (16) is fixedly installed outside the material guiding pipe (14); A storage hopper (17) for temporarily storing coal blocks, and the storage hopper (17) is communicated and arranged inside the material guiding pipe (14); A screw conveyor main body (18) for pushing the coal blocks to move, and the screw conveyor main body (18) is arranged inside the material guiding pipe (14).

2. The pulverized coal feeder powder delivery device according to claim 1, characterized in that: The output end of the second motor (16) penetrates through the inside of the diversion pipe, and the right end of the output end of the second motor (16) is fixedly connected to the screw conveyor main body (18). The second motor (16) is a servo motor and receives external instructions (such as 0 - 10V or PWM signals).

3. The coal powder feeding device of a coal injector according to claim 1, characterized in that: The outer wall of the rotating shaft (6) is fixedly connected to the axis center of the sieve plate (8), and the outside of the sieve mesh (13) is movably attached to the outside of the sieve plate (8).

4. A pulverized coal feeder device according to claim 1, characterized in that: The plurality of positive crushing teeth (10) are arranged inside the plurality of reverse crushing teeth (12). One end of the material guiding pipe (14) away from the storage hopper (17) penetrates through the inside of the collar (11) and extends to the inside of the plurality of reverse crushing teeth (12).

5. A pulverized coal feeder powder delivery device according to claim 1, characterized in that: Both sides of the conveying frame (4) are provided with powder spraying pipes, and the two powder spraying pipes are arranged one above the other.

6. The coal feeder powder feeding device according to claim 1, characterized in that: The diameter of the mesh holes formed in the screen (13) is 50um - 70um.

7. A pulverized coal feeder powder delivery device according to claim 1, characterized in that: The booster pipe (15) is externally connected to an industrial blower. The booster pipe (15) is inclined and faces downward.

8. The pulverized coal feeder powder delivery device according to claim 5, characterized in that: The side of the powder spraying pipe away from the conveying frame (4) is designed with a tapered structure, and the screen (13) is arranged inside the coal spraying holes (9).

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