Anti-blocking device of ash silo

Abstract

The invention provides an anti-blocking device of an ash silo, and relates to the technical field of ash silo equipment, the anti-blocking device comprises a driving mechanism and a stirring mechanism, the driving mechanism is mounted on the outer wall of the bottom of the ash silo, and the stirring mechanism is mounted on the inner wall of the bottom of the ash silo. The driving mechanism and the stirring mechanism are arranged, the stirring mechanism is driven through operation of the driving mechanism, and therefore the problems that in the prior art, a mechanical vibration device and a mechanical stirring device make large-area direct contact with fly ash and are prone to being corroded and abraded by the fly ash, and frequent maintenance and replacement requirements are caused are effectively solved; and the dredging effect of compressed air cleaning is poor under the condition that the dust amount is high.

Description

Technical Field

[0001] The invention relates to the technical field of ash silo equipment, and in particular to an anti-blocking device for an ash silo. Background Art

[0002] In the ash storage of thermal power plants, fly ash is often discharged poorly due to bridging or accumulation during the discharge process, thus affecting the normal operation of the equipment. At present, the solution to this problem mainly relies on mechanical vibration devices, compressed air cleaning or mechanical stirring devices.

[0003] However, these traditional methods have multiple technical bottlenecks, mainly manifested as: the mechanical vibration device and the mechanical stirring device are in direct contact with the fly ash over a large area, which is susceptible to corrosion and wear by the fly ash, resulting in frequent maintenance and replacement requirements, and the compressed air cleaning has a poor dredging effect when the dust volume is high. Therefore, in view of the above situation, it is urgent to develop an anti-blocking device for the ash silo to overcome the shortcomings in current practical applications. Summary of the invention

[0004] The present invention provides an anti-clogging device for an ash silo, which is used to solve the technical problems raised by the above background technology: in the prior art, mechanical vibration devices and mechanical stirring devices are in direct contact with fly ash over a large area, are easily corroded and worn by fly ash, resulting in frequent maintenance and replacement requirements, and compressed air cleaning has poor dredging effect when the dust amount is high.

[0005] To solve the above technical problems, the present invention discloses an anti-blocking device for an ash silo, comprising: a driving mechanism and a stirring mechanism, wherein the driving mechanism is installed on the outer wall of the bottom of the ash silo, and the stirring mechanism is installed on the inner wall of the bottom of the ash silo.

[0006] Preferably, the motor is installed inside the support frame, the motor shaft of the motor is connected with a permanent magnet and a gear, the drive side ball is installed on the end face of the support frame, the drive side positioning permanent magnet is installed on both sides of the support frame, the outer wall of the bottom of the ash bin is installed with a slide rail, and the inside of the slide rail is installed with a rack that meshes with the gear.

[0007] Preferably, a copper conductor is installed at the bottom of the stirring blade, the stirring blade is embedded in the support plate, a driven side ball is installed at the embedding point of the stirring blade and the support plate, a driven side ball is installed on the end face of the support plate, and driven side positioning permanent magnets are installed on both sides of the support plate, and the driven side positioning permanent magnet and the driving side positioning permanent magnet attract each other.

[0008] Preferably, the motor transmits the torque to the stirring blade through the sealed ash bin, and the motor further comprises: According to formula (1) to formula (4), the electromagnetic torque of the motor is calculated : (1); (2); (3); (4); in is the average air gap flux density of the motor, Ω is the main magnetic flux of the motor, is the outer radius of the permanent magnet, is the inner radius of the permanent magnet, is the central angle of a single permanent magnet, L is the three-dimensional correction factor, is the speed difference between the inner and outer rotors of the motor, is the motor shaft speed of the motor, is the copper conductor thickness, is the number of pole pairs of the permanent magnet, For custom parameters, is the copper conductor thickness, is the vacuum magnetic permeability, g is the air gap distance, δ is the electrical conductivity of the copper conductor, is a sine, is the cosine, is the tangent, The value is 3.14.

[0009] Preferably, according to formula (5) to formula (7), the rotation speed of the stirring blade is calculated as : (5); (6); (7); in is the device parameter of the motor, is the air gap function of the motor, represents the quadratic load factor of the mixing blade; Preferably, according to formula (8), the range of motor speed is calculated: : (8); in is the minimum speed of the stirring blade, is the relationship coefficient between the stirring blade speed and the motor shaft speed, is the maximum speed of the motor along the slide rail, is the gear diameter, is the gear linear speed.

[0010] Preferably, the degree of dust disturbance is calculated according to the following formula (9): : (9); in is the density of dust, is the rotation radius of the stirring blade, The viscosity of the dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 A schematic diagram of the structure provided by an embodiment of the present invention; Figure 2 The embodiment of the present invention provides Figure 1 Top view of the structure; Figure 3 A schematic diagram of the structure of a driving mechanism provided in an embodiment of the present invention; Figure 4 and Figure 5 A schematic diagram of the structure of a stirring mechanism provided in an embodiment of the present invention; Figure 6 Provide a driving mechanism installation position diagram for an embodiment of the present invention; Figure 7 A schematic structural diagram of an anti-blocking device provided in an embodiment of the present invention.

[0013] Reference numerals: 1. Ash bin; 2. Slide rail; 3. Rack; 4. Motor; 5. Support frame; 6. Gear; 7. Driving side positioning permanent magnet; 8. Driving side ball bearing; 9. Permanent magnet; 10. Stirring blade; 11. Driven side ball bearing; 12. Driven side positioning permanent magnet; 13. Copper conductor; 14. Support plate. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0015] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0016] The present invention provides the following embodiments Example 1 The embodiment of the present invention provides an anti-blocking device for an ash silo, such as Figure 1 As shown, an anti-blocking device for an ash silo includes: a driving mechanism and a stirring mechanism, wherein the driving mechanism is installed on the outer wall of the bottom of the ash silo 1, and the stirring mechanism is installed on the inner wall of the bottom of the ash silo 1; The driving device is composed of a motor 4, a support frame 5, a gear 6, a driving side positioning permanent magnet 7, a driving side ball 8 and a permanent magnet 9; The stirring device is composed of a stirring blade 10 , a driven side ball 11 , a driven side positioning permanent magnet 12 , a copper conductor 13 and a support plate 14 .

[0017] The beneficial effects of the above technical scheme are as follows: the present invention solves the problem of motor 4 being corroded by fly ash in the traditional design by arranging the motor 4 outside the ash bin 1 and transmitting the torque of the motor 1 to the stirring blade 10 through a magnetic coupler; the contactless magnetic coupling design applied in the present invention reduces the influence of fly ash on the transmission device while ensuring the efficiency and reliability of torque transmission; in addition, the present invention enables the whole device to move smoothly on the wall of the ash bin 1 through the design combining the slide rail 2, the gear 6 and the rack 3, thereby improving the range of action and flexibility of the device, thereby significantly improving the efficiency and reliability of the dredging device in the ash bin 1, and by introducing the magnetic coupler and the gear rack structure, a new solution is provided, which can effectively prevent fly ash blockage and bridging while improving the working efficiency of the dredging device and reducing the maintenance requirements of the equipment, thereby effectively improving the background technology proposed: in the prior art, the mechanical vibration device and the mechanical stirring device are in direct contact with the fly ash over a large area, and are susceptible to corrosion and wear by the fly ash, resulting in frequent maintenance and replacement requirements, and the technical problem that the dredging effect of compressed air cleaning is poor when the dust volume is high.

[0018] Example 2 On the basis of Example 1, Figure 1-7 As shown, in the anti-blocking device of the ash silo, the motor 4 is installed inside the support frame 5, the motor shaft of the motor 4 is connected with a permanent magnet 9 and a gear 6, and a driving side ball 8 is installed on the end face of the support frame 5, and a driving side positioning permanent magnet 7 is installed on both sides of the support frame 5, and a slide rail 2 is installed on the outer wall of the bottom of the ash silo 1, and a rack 3 meshing with the gear 6 is installed inside the slide rail 2.

[0019] Optionally, a copper conductor 13 is installed at the bottom of the stirring blade 10, the stirring blade 10 is embedded with the support plate 14, a driven side ball 11 is installed at the embedding point of the stirring blade 10 and the support plate 14, the driven side ball 11 is installed on the end face of the support plate 14, and driven side positioning permanent magnets 12 are installed on both sides of the support plate 14, and the driven side positioning permanent magnet 12 and the driving side positioning permanent magnet 7 attract each other.

[0020] The working principle of the above technical solution is as follows: after the fly ash enters the ash bin from the top of the ash bin 1, it falls to the bottom of the ash bin 1. During the fly ash discharge process, the device starts to operate. First, the motor 4 is started, and the rotation of the motor shaft is transmitted to the driving side positioning permanent magnet 7 and the gear 6. On the one hand, the gear 6 is meshed with the rack 3 in the slide rail 2, and the rotation of the gear 6 drives the entire drive mechanism to move along the slide rail 2. On the other hand, the permanent magnet 9 and the copper conductor 13 form a magnetic coupler. The torque of the driving side positioning permanent magnet 7 is transmitted to the copper conductor 13, thereby driving the rotation of the stirring blade 10. In order to ensure the effective transmission of the magnetic coupler, it is necessary to keep the center of the input shaft and the output shaft aligned. Therefore, the driving side positioning permanent magnet 7 is installed on both sides of the support frame 5, and the driven side positioning permanent magnet 12 is installed on both sides of the support plate 14. During the movement of the driving mechanism, the driving side positioning permanent magnet 7 and the driven side positioning permanent magnet 12 attract each other, so as to ensure that the central axis of the motor rotor and the central axis of the stirring blade 10 are aligned.

[0021] The beneficial effects of the above technical solution are: (1) The present invention arranges the motor 4 outside the ash bin 1 and uses a magnetic coupling for contactless transmission, thereby avoiding direct contact between the drive mechanism and the fly ash, significantly reducing the wear and corrosion problems of the equipment, thereby extending the service life of the equipment and reducing the maintenance frequency; (2) The present invention introduces a design combining a slide rail and a gear rack to enable the entire device to dynamically dredge the fly ash, making the single device have a wider range of action and more flexible operation; (3) The present invention transmits the torque of the motor 4 to the stirring blade 10 through the ash bin wall through the magnetic coupling, thereby achieving complete sealing of the ash bin. This design effectively avoids the problem of dust leakage and ensures the environmental protection and safety of the system during operation; (4) The present invention utilizes the principle of attraction between opposite poles of permanent magnets to make the stirring blade 10 closely attached to the inner wall surface of the ash silo 1, so that the position of the stirring blade 10 can be adjusted accordingly with the change of the position of the motor 4. This design not only ensures the efficient operation of the magnetic coupler, but also enables the device to be flexibly adapted to the existing ash silo structure, and can be installed and applied without large-scale modification of the in-service ash silo 1.

[0022] Example 3 On the basis of Embodiment 1-2, an anti-blocking device for an ash silo is provided, wherein the motor 4 transmits torque to the stirring blade 10 through the sealed ash silo 1, and the motor 4 further comprises: According to formula (1) to formula (4), the electromagnetic torque of the motor is calculated : (1); (2); (3); (4); in is the average air gap flux density of the motor 4, Ω is the main magnetic flux of the motor 4, is the outer radius of the permanent magnet 9, is the inner radius of the permanent magnet 9, is the central angle of a single permanent magnet 9, L is the three-dimensional correction factor, is the differential speed between the inner and outer rotors of the motor 4, is the motor shaft speed of motor 4, is the thickness of the copper conductor 13, is the number of pole pairs of the permanent magnet 9, Custom parameters (Motor custom parameters refer to the process in which users manually set and adjust the various operating parameters of the motor according to the specific model, use environment and performance requirements of the motor. These parameters include but are not limited to the motor's speed, current, voltage, power factor, frequency, rating (duty), insulation protection level, etc.), is the thickness of the copper conductor 13, is the vacuum magnetic permeability, g is the air gap distance of the motor 4 (referring to the actual physical distance between the rotor and the stator inside the motor), δ is the electrical conductivity of the copper conductor 13, is a sine, is the cosine, is the tangent, The value is 3.14.

[0023] Optionally, according to the speed regulation principle, the magnetic coupling can control the output speed by adjusting the air gap thickness between the rotors, and the relationship between the air gap thickness between the rotors and the output speed during the speed regulation process is defined as the speed regulation relationship of the magnetic coupling, and the relationship between the torque and the speed of the stirring blade 10 conforms to the characteristics of the quadratic load, so according to formula (5) to formula (7), the speed of the stirring blade 10 is calculated. : (5); (6); (7); in is the equipment parameter of motor 4, is the air gap function of motor 4, represents the quadratic load factor of the stirring blade 10 (the value range is 1.5-2.5); Optionally, the motor shaft speed affects the speed of the stirring blade 10 on the one hand. The higher the speed, the greater the dust disturbance and the better the dredging effect. On the other hand, it affects the speed of the motor 4 moving along the slide rail 2. The higher the speed, the faster the motor moves. In order to ensure that the device can efficiently dredge the fly ash while moving smoothly on the ash bin wall, it is necessary to specify the range of the motor 4 speed. Therefore, according to formula (8), the range of the motor 4 speed is calculated. : (8); in is the minimum rotation speed of the stirring blade 10, is the relationship coefficient between the speed of the stirring blade 1 and the speed of the motor shaft (the value range is 0.6-1.0), is the maximum speed of the motor along rail 2, is the gear diameter, is the gear linear speed, that is, the speed at which the motor moves along the slide rail.

[0024] Optionally, the degree of dust disturbance is often positively correlated with the device's dredging effect on fly ash. Among many factors, the stirring radius and angular velocity of the stirring blade 10 have the greatest impact on the disturbance effect. Therefore, according to the following formula (9), the degree of dust disturbance is calculated: : (9); in is the density of dust, is the rotation radius of the stirring blade 10, The viscosity of the dust.

[0025] Example 4 On the basis of Embodiments 1-3, in the process of the motor 4 driving the gear to rotate, for a DC motor or an AC motor, the relationship between its control input u(t) and the motor shaft angular velocity ωm(t) can generally be expressed by the following first-order linear control system model: (10); in is the moment of inertia of the motor shaft, B e is the damping coefficient of the motor shaft (the range is 0.1-2.0), is the torque constant of the motor shaft, u(t) is the input voltage of the motor, is the angular velocity of the motor shaft.

[0026] Optionally, the rotation of the motor shaft drives the gear to rotate, and the gear 6 meshes with the rack 3 located on the outer wall of the ash bin. Under the rotation of the gear 6, the motor 4 moves along the slide rail 2, and the gear 6 is nested on the motor shaft, that is, the rotation of the gear 6 is directly coupled with the rotation of the motor shaft, so the angular velocity of the gear 6 is the same as the angular velocity of the motor shaft. The specific expression is as follows: (11); in, is the angular velocity of the motor shaft; is the angular velocity of gear 6.

[0027] Optionally, in order to control the working state of the motor 4 and thus control the rotation of the gear 6, a closed-loop control strategy is usually adopted, such as a PID controller, which adjusts the input voltage according to the error between the target state and the current state. , the specific expression is as follows: (12); (13); in, is the ideal gear angular velocity, is the difference between the ideal gear angular velocity and the current gear angular velocity, , , They represent the proportional, integral and differential gains of the set ideal gear respectively.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-blocking device for an ash silo, characterized in that: include: A driving mechanism and a stirring mechanism, wherein the driving mechanism is installed on the outer wall of the bottom of the ash bin (1), and the stirring mechanism is installed on the inner wall of the bottom of the ash bin (1).

2. The anti-blocking device of the ash silo according to claim 1 is characterized in that: The motor (4) is installed inside the support frame (5), the motor shaft of the motor (4) is connected to a permanent magnet (9) and a gear (6), and a drive side ball bearing (8) is installed on the end surface of the support frame (5), and drive side positioning permanent magnets (7) are installed on both sides of the support frame (5). A slide rail (2) is installed on the outer wall of the bottom of the ash bin (1), and a rack (3) meshing with the gear (6) is installed inside the slide rail (2).

3. The anti-blocking device of the ash silo according to claim 1 is characterized in that: A copper conductor (13) is installed at the bottom of the stirring blade (10), the stirring blade (10) is embedded with a support plate (14), a driven side ball (11) is installed at the embedded position between the stirring blade (10) and the support plate (14), the driven side ball (11) is installed on the end surface of the support plate (14), and driven side positioning permanent magnets (12) are installed on both sides of the support plate (14), and the driven side positioning permanent magnets (12) and the driving side positioning permanent magnets (7) attract each other.

4. The anti-blocking device for ash silo according to claim 1 is characterized in that: The motor (4) transmits torque to the stirring blade (10) through the sealed ash bin (1), and the motor (4) also includes: According to formula (1) to formula (4), the electromagnetic torque of motor (4) is calculated : （1）； （2）； （3）； （4）； in is the average air gap flux density of the motor (4), Ω is the main magnetic flux of the motor (4), is the outer radius of the permanent magnet (9), is the inner radius of the permanent magnet (9), is the central angle of a single permanent magnet (9), L is the three-dimensional correction factor, is the differential speed between the inner and outer rotors of the motor (4), is the motor shaft speed of the motor (4), is the thickness of the copper conductor (13), is the number of pole pairs of the permanent magnet (9), For custom parameters, is the thickness of the copper conductor (13), is the vacuum magnetic permeability, g is the air gap distance of the motor (4), δ is the electrical conductivity of the copper conductor (13), is a sine, is the cosine, is the tangent, The value is 3.

14.

5. The anti-blocking device for ash silo according to claim 1 is characterized in that: According to formula (5) to formula (7), the rotation speed of the stirring blade (10) is calculated. : （5）； （6）； （7）； in are the equipment parameters of the motor (4), is the air gap function of the motor (4), represents the quadratic load factor of the stirring blade (10).

6. The anti-blocking device for ash silo according to claim 5, characterized in that: According to formula (8), the range of the speed of motor (4) is calculated: : （8）； in is the minimum rotation speed of the stirring blade (10), is the coefficient of relationship between the speed of the stirring blade (1) and the speed of the motor shaft, is the maximum speed of the motor along the guide rail (2), is the diameter of gear (6), is the gear linear speed.

7. The anti-blocking device for ash silo according to claim 5, characterized in that: According to the following formula (9), the degree of dust disturbance is calculated : （9）； in is the density of dust, is the rotation radius of the stirring blade (10), The viscosity of the dust.

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