Ash scraping mechanism and electrostatic dust collector

Abstract

The invention discloses an ash scraping mechanism and an electrostatic dust collector, belongs to the technical field of electrostatic dust collection, and mainly aims to enhance the bearing capacity of the ash scraping mechanism to dust load and improve the ash removal efficiency. According to the main technical scheme, the dust scraping mechanism comprises a dust scraping plate, the dust scraping plate is arranged in an inner cavity of a cylindrical shell, the dust scraping plate makes contact with a dust layer adhering to the inner wall of the cylindrical shell, and the dust scraping plate can move relative to the cylindrical shell in the circumferential direction of the cylindrical shell; wherein a plurality of dust suction ports and a plurality of dust blowing ports are formed in the working face of the dust scraping plate, a dust suction channel and a dust blowing channel are arranged in the dust scraping plate, and the dust suction ports and the dust blowing ports are connected to a dust suction device and a dust blowing device through the dust suction channel and the dust blowing channel respectively.

Description

Technical Field

[0001] The present application belongs to the technical field of electrostatic dust removal, and specifically relates to a scraping mechanism and an electrostatic dust collector. Background Art

[0002] In industries such as steelmaking and thermal power generation, electrostatic precipitators (ESPs) are key equipment for treating dusty flue gases and achieving efficient dust collection. Their operating principle is to charge dust particles using a high-voltage electric field. The charged dust then moves toward the anode plate, where it is attracted and attracted. A vibrating system then releases the dust into the interior of the cylindrical shell. However, if dust deposited on the inner wall of the cylindrical shell is not promptly removed, it can reduce dust collection efficiency, increase operating resistance, and even cause faults such as electric field short circuits.

[0003] Currently, electrostatic precipitators are typically equipped with scraping mechanisms to remove accumulated dust from the cylindrical shell. However, in actual operation, the amount of dust adsorbed by the electrostatic precipitator fluctuates significantly due to the dynamic adjustment of the type and ratio of materials added during the smelting process based on the steel grade plan. When the dust load suddenly increases, existing scraping mechanisms are prone to deformation, obstruction, and tooth jumping. Summary of the Invention

[0004] In view of this, the present application provides a scraping mechanism and an electrostatic precipitator, the main purpose of which is to enhance the carrying capacity of the scraping mechanism for dust load and improve the cleaning efficiency.

[0005] To achieve the above objectives, this application mainly provides the following technical solutions:

[0006] In one aspect of the present application, a scraping mechanism is provided, comprising:

[0007] A dust scraper, the dust scraper being arranged in the inner cavity of the cylindrical shell, the dust scraper being in contact with the dust layer adhered to the inner wall of the cylindrical shell, and the dust scraper being able to move relative to the cylindrical shell in the circumferential direction of the cylindrical shell;

[0008] In which, the working surface of the scraper plate is provided with multiple ash suction ports and multiple ash blowing ports, and the interior of the scraper plate is provided with ash suction channels and ash blowing channels, and the multiple ash suction ports and the multiple ash blowing ports are connected to the ash suction device and the ash blowing device respectively through the ash suction channels and the ash blowing channels.

[0009] Optionally, the scraping mechanism further includes:

[0010] A driving device is connected to the scraper plate and is used to drive the scraper plate to perform reciprocating swinging motion along the circumferential direction on the inner wall of the cylindrical shell.

[0011] Optionally, the driving device includes:

[0012] Driving part, transmission part and connecting part;

[0013] The first end of the transmission part is connected to the driving part, and the second end is connected to the connecting part, for converting the power of the driving part into a circumferential swing of the connecting part;

[0014] The connecting portion is also connected to the scraper plate, and the driving portion is used to drive the transmission portion to move, thereby driving the scraper plate through the connecting portion to perform the reciprocating swinging motion with the axis of the cylindrical shell as the rotation center.

[0015] Optionally, the transmission unit includes:

[0016] Drive shafts, drive gears and drive gear chains;

[0017] The transmission shaft extends along the axial direction of the cylindrical shell, and the driving end of the driving part is connected to the transmission shaft for driving the transmission shaft to rotate;

[0018] The transmission gear is sleeved on the transmission shaft, and the transmission gear rotates synchronously with the transmission shaft;

[0019] The transmission tooth chain is meshed with the transmission gear, and the connecting portion is relatively fixed to the transmission tooth chain;

[0020] In which, the transmission tooth chain is arc-shaped, and the center of curvature of the transmission tooth chain coincides with the axis of the cylindrical shell; when the driving part drives the transmission shaft to rotate forward and reverse, the transmission gear drives the transmission tooth chain to perform the reciprocating swinging motion with the axis of the cylindrical shell as the rotation center, and the reciprocating swinging motion of the transmission tooth chain is transmitted to the scraper plate through the connecting part, so that the scraper plate performs the reciprocating swinging motion synchronously.

[0021] Optionally, the connecting portion includes:

[0022] Swing bracket and plastering frame;

[0023] The swing bracket is suspended inside the cylindrical shell through a rotary bearing, the axis of the rotary bearing coincides with the axis of the cylindrical shell, the transmission gear chain is connected to the swing bracket, and the swing bracket is used to convert the reciprocating swinging motion of the transmission gear chain into its own rotational swing around the axis of the cylindrical shell;

[0024] The scraping frame is arranged at the bottom of the swing bracket, and the scraping frame extends along the circumferential direction of the cylindrical shell. The scraping plate is connected to the scraping frame, and the scraping plate is arranged along the radial outer side surface of the scraping frame.

[0025] Optionally, the scraper includes:

[0026] a first scraper and a second scraper;

[0027] At least two of the first scraping plates are provided, and the at least two first scraping plates are respectively provided at both ends of the scraping frame;

[0028] There are multiple second scraping boards, and the multiple second scraping boards are located between at least two of the first scraping boards;

[0029] The first scraper plate includes an auxiliary scraping portion and a guide portion, the guide portion is provided on a side of the auxiliary scraping portion away from the second scraper plate, and the inclination angle between the working surface of the guide portion and the inner wall of the cylindrical shell is smaller than the inclination angle between the working surface of the auxiliary scraping portion and the inner wall of the cylindrical shell;

[0030] The second scraper plate includes two symmetrically arranged main scraping parts, and the working surfaces of the two main scraping parts have the same inclination angle with the inner wall of the cylindrical shell.

[0031] Optionally, the scraping mechanism further includes:

[0032] Soot suction pipe and soot blowing pipe;

[0033] The ash suction channel and the ash blowing channel are also provided inside the swing bracket and the ash scraping frame;

[0034] One end of the ash suction pipe is connected to the ash suction device, and the other end is connected to the outlet of the ash suction channel of the swing bracket through a first rotary joint. The inlet of the ash suction channel of the swing bracket is connected to the outlet of the ash suction channel of the scraping frame. The inlet of the ash suction channel of the scraping frame is connected to the outlet of the ash suction channel of the scraping plate.

[0035] One end of the soot blowing pipe is connected to the soot blowing device, and the other end is connected to the inlet of the soot blowing channel of the swing bracket through a second rotary joint. The outlet of the soot blowing channel of the swing bracket is connected to the inlet of the soot blowing channel of the scraping frame. The outlet of the soot blowing channel of the scraping frame is connected to the inlet of the soot blowing channel of the scraping plate.

[0036] Optionally, both the soot suction pipe and the soot blowing pipe are provided with valve groups.

[0037] Optionally, an ash discharge trough is provided at the bottom of the inner wall of the cylindrical shell, and the ash discharge trough extends along the axial direction of the cylindrical shell. An ash conveying chain is provided in the ash discharge trough, and the ash conveying chain is used to receive and transport fine ash falling into the ash discharge trough.

[0038] Another aspect of the present application provides an electrostatic precipitator, comprising:

[0039] Any one of the above scraping mechanisms;

[0040] Among them, when the electrostatic precipitator is in the dust removal working state, the dust suction device is started synchronously; when the scraper performs circumferential scraping action on the inner wall of the cylindrical shell and the scraper is in a stuck state due to dust agglomeration or foreign matter obstruction, the dust blowing device is started.

[0041] By means of the above technical solution, this application has at least the following beneficial effects:

[0042] In the scraping mechanism and electrostatic dust collector provided in the embodiments of the present application, the scraping plate contacts the dust layer adhered to the inner wall of the cylindrical shell, and directly scrapes away the attached dust through circumferential motion. The motion trajectory is consistent with the circumferential direction of the cylindrical shell, which can evenly distribute the scraping force on the entire plate body, reduce the local stress concentration caused by the sudden change of the dust load, and thus reduce the probability of deformation and jamming of the scraping plate; at the same time, the ash suction port and the ash blowing port on the working surface are connected to the ash suction device and the ash blowing device through the ash suction channel and the ash blowing channel respectively, which can simultaneously realize the use of high-pressure gas to impact the stubbornly adhered dust layer, destroy the binding force between the dust and the cylindrical shell, make it easier for the scraping plate to remove the accumulated dust and timely absorb the scraped dust through negative pressure, and avoid the dust from being raised or accumulated again in the shell. Specifically, the ash blowing process can loosen the dust layer in advance, reduce the friction resistance between the scraping plate and the cylindrical shell, reduce the direct wear of the scraping plate and the cylindrical shell, and extend the service life of the equipment. In addition, the dust suction process can quickly remove the scraped dust, preventing dust particles from embedding in the gaps between moving parts, further reducing the risk of mechanical failures such as jamming and tooth jumping. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a structural diagram of a scraping mechanism according to an optional embodiment of the present application;

[0044] Figure 2 for Figure 1 A cross-sectional view of the scraping mechanism shown;

[0045] Figure 3 for Figure 2 The local large picture at A in the middle;

[0046] Figure 4 This is a schematic structural diagram of an electrostatic precipitator according to an optional embodiment of the present application.

[0047] The reference numerals indicate:

[0048] 1. Cylindrical shell; 11. Ash discharge chute; 2. Scraper plate; 21. First scraper plate; 211. Auxiliary scraper portion; 212. Diversion portion; 22. Second scraper plate; 221. Main scraper portion; 3. Driving device; 31. Driving portion; 32. Transmission portion; 321. Transmission shaft; 322. Transmission gear; 323. Transmission gear chain; 33. Connecting portion; 331. Swinging bracket; 332. Scraper frame; 4. Ash suction device; 5. Ash blowing device; 6. Ash suction channel; 7. Ash blowing channel; 8. Ash suction pipe; 9. Ash blowing pipe; 10. Valve group. DETAILED DESCRIPTION

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0051] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0052] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0053] See also Figures 1 to 4 As shown, the first aspect of the embodiment of the present application provides a scraping mechanism, and the second aspect of the embodiment of the present application provides an electrostatic precipitator.

[0054] Among them, the scraping mechanism is used in electrostatic precipitator.

[0055] Specifically, the electrostatic precipitator can be a horizontal electrostatic precipitator with a multi-chamber structure. It is understood that when the electrostatic precipitator is a horizontal electrostatic precipitator with a multi-chamber structure, multiple electric field chambers are formed inside the cylindrical shell 1 of the electrostatic precipitator, and a dust scraping mechanism is provided in each electric field chamber.

[0056] In some possible implementations disclosed in this application, see Figures 1 to 3 As shown, the scraping mechanism includes a scraping plate 2, which is arranged in the inner cavity of the cylindrical shell 1. The scraping plate 2 is in contact with the dust layer adhered to the inner wall of the cylindrical shell 1, and the scraping plate 2 can move relative to the cylindrical shell 1 in the circumferential direction of the cylindrical shell 1; wherein, the working surface of the scraping plate 2 is provided with a plurality of ash suction ports and a plurality of ash blowing ports, and the interior of the scraping plate 2 is provided with an ash suction channel 6 and a ash blowing channel 7, and the plurality of ash suction ports and the plurality of ash blowing ports are connected to the ash suction device 4 and the ash blowing device 5 respectively through the ash suction channel 6 and the ash blowing channel 7.

[0057] In the scraping mechanism provided in the embodiment of the present application, the scraping plate 2 contacts the dust layer adhered to the inner wall of the cylindrical shell 1, and directly scrapes away the attached dust through circumferential motion. The motion trajectory is consistent with the circumferential direction of the cylindrical shell 1, which can evenly distribute the scraping force on the entire plate body, reduce the local stress concentration caused by the sudden change of the dust load, and thus reduce the probability of deformation and blocking of the scraping plate 2; at the same time, the ash suction port and the ash blowing port on the working surface are respectively connected to the ash suction device 4 and the ash blowing device 5 through the ash suction channel 6 and the ash blowing channel 7, which can simultaneously realize the use of high-pressure gas to impact the stubbornly adhered dust layer, destroy the binding force between the dust and the cylindrical shell 1, and facilitate the scraping plate 2 to more easily remove the accumulated dust and to timely suck away the scraped dust through negative pressure, thereby avoiding the dust from being raised or accumulated again in the shell. It can be understood that the ash blowing process can loosen the dust layer in advance, reduce the friction resistance between the scraping plate 2 and the cylindrical shell 1, reduce the direct wear of the scraping plate 2 and the cylindrical shell 1, and extend the service life of the equipment. The dust suction process can quickly remove the scraped dust, preventing dust particles from embedding in the gaps between moving parts, further reducing the risk of mechanical failures such as jamming and tooth jumping.

[0058] The scraper blade 2 is a long, strip-shaped structure extending axially along the cylindrical shell 1. A clearance exists between its outer edge and the inner wall of the cylindrical shell 1, preventing the scraper blade 2 from directly rubbing against the inner wall of the cylindrical shell 1 and reducing wear on the equipment. The outer edge of the scraper blade 2 refers to the edge opposite the inner wall of the cylindrical shell 1. The clearance between the outer edge of the scraper blade 2 and the inner wall of the cylindrical shell 1 is 10 to 15 mm.

[0059] The rotation center of the scraper plate 2 rotating along the circumferential direction of the cylindrical shell 1 coincides with the axis of the cylindrical shell 1, and the load is distributed through continuous rotation to improve the impact resistance.

[0060] Among them, a plurality of dust suction ports and a plurality of dust blowing ports are evenly distributed on the side of the scraper plate 2 facing the dust layer, that is, the working surface, and the plurality of dust suction ports and the plurality of dust blowing ports are staggered to cover the entire area.

[0061] The scraper 2 has at least two channels formed within it: a soot blowing channel 7 and a soot suction channel 6. The soot blowing channel 7 connects the soot blowing device 5 to the soot blowing port, while the soot suction channel 6 connects the soot suction device 4 to the soot suction port. It is understood that the soot blowing device 5 can be an external nitrogen source, ejecting high-pressure nitrogen from the soot blowing port to loosen the dust layer. The soot suction device 4 can be a negative pressure blower, sucking scraped dust through the soot suction port and transporting it to the ash bin.

[0062] Specifically, the scraping mechanism is used in electrostatic precipitators with large dust load fluctuations, such as those used for dust removal in converters / blast furnaces in steel plants and pulverized coal furnaces in thermal power plants. When the electrostatic precipitator is operating normally, that is, in the dust removal stage, the dust suction device 4 is activated to form a negative pressure airflow near the inner wall of the cylindrical shell 1, actively adsorbing and collecting dust particles that have not yet been completely deposited or suspended, reducing the amount of dust retained in the shell, reducing the subsequent scraping load, and avoiding excessive dust accumulation that may cause the scraper 2 to become blocked; when the scraper 2 rotates circumferentially along the cylindrical shell 1, that is, performing the scraping action, the soot blowing device 5 is activated and sprays high-pressure gas toward the inner wall of the cylindrical shell 1 through the soot blowing channel 7 and the soot blowing port, pre-loosening the dust layer near the scraper 2 and reducing the scraping resistance. During this process, the airflow formed by high-pressure gas can help remove highly adherent dust, cooperating with the physical scraping of the scraper 2 to improve cleaning efficiency. When the scraper 2 cannot rotate normally due to dust agglomeration or foreign matter obstructing it, the soot blowing device 5 is activated, and the airflow formed by high-pressure gas can impact the dust agglomeration or foreign matter, attempting to remove the mechanical obstruction and prevent damage to the equipment due to overload. Here, the start and stop of the soot suction device 4 is directly related to the working state of the electrostatic precipitator. Specifically, when the electrostatic precipitator is in the dust removal stage, the soot suction device 4 is continuously activated, regardless of the movement state of the scraper 2. When the electrostatic precipitator is shut down, the soot suction device 4 is synchronously shut down. The start and stop of the soot blowing device 5 is triggered by the movement state of the scraper 2. Specifically, when the scraper 2 performs a circumferential rotation and scraping action, the soot blowing device 5 is synchronously activated, spraying high-pressure gas through the soot blowing port to assist in dust cleaning. When the scraper 2 is stuck due to dust agglomeration or foreign matter obstructing it, the soot blowing device 5 is activated, and the airflow formed by high-pressure gas is used to impact and remove the obstruction.

[0063] In some possible implementations disclosed in this application, see Figure 1As shown, the scraping mechanism further includes a driving device 3 , which is connected to the scraping plate 2 and is used to drive the scraping plate 2 to perform reciprocating swinging motion along the circumferential direction on the inner wall of the cylindrical shell 1 .

[0064] In this embodiment, the reciprocating swinging motion can make the scraper plate 2 perform periodic back and forth motion within the circumferential range of the inner wall of the cylindrical shell 1, thereby repeatedly impacting the dust layer, and cooperating with the pre-loosening effect of the soot blowing device 5, more effectively destroying the binding force between the dust and the inner wall of the cylindrical shell 1, thereby improving the cleaning efficiency; at the same time, the reciprocating swinging motion can also make the scraper plate 2 alternately subjected to force in both directions, and evenly wear; at the same time, the reciprocating swinging motion can also make the scraper plate 2 move in the opposite direction to try to unblock, thereby reducing the risk of jamming.

[0065] In some specific examples, the drive device 3 includes a motor and a rotating shaft. The motor, serving as the power source, is mounted on the exterior or side of the cylindrical shell 1 and connected to the rotating shaft via a coupling. The rotating shaft is located on the axis of the cylindrical shell 1, with its axis coinciding with the central axis of the cylindrical shell 1, and is fixedly connected to the scraper blade 2. When the motor is started, the rotating shaft transmits driving force to the scraper blade 2, driving the scraper blade 2 to swing back and forth in a circumferential direction around the axis of the cylindrical shell 1.

[0066] The swing direction of the scraper plate 2 is the circumferential direction of the cylindrical shell 1, that is, the tangential direction of the circumference.

[0067] The swing trajectory of the scraper plate 2 is an arc.

[0068] The scraper plate 2 can swing at an angle of 60° to 120°.

[0069] In addition, the drive device 3 can also be configured as follows:

[0070] See also Figures 1 to 3 As shown, the driving device 3 includes a driving part 31, a transmission part 32 and a connecting part 33; the first end of the transmission part 32 is connected to the driving part 31, and the second end is connected to the connecting part 33, which is used to convert the power of the driving part 31 into circumferential swing of the connecting part 33; the connecting part 33 is also connected to the scraper 2, and the driving part 31 is used to drive the transmission part 32 to move, and then drive the scraper 2 to perform reciprocating swinging motion with the axis of the cylindrical shell 1 as the rotation center through the connecting part 33.

[0071] Here, the driving part 31 transmits power to the connecting part 33 through the transmission part 32, and the connecting part 33 then drives the scraper 2 to move. This layered structural design ensures low torque loss and high transmission efficiency during power transmission, avoiding impact or jamming problems caused by direct drive.

[0072] The driving part 31 can be a speed reducer, which serves as a power source to provide rotational power and is installed outside the cylindrical shell 1 .

[0073] Among them, a part of the transmission part 32 is located outside the cylindrical shell 1 and is used to connect to the driving part 31; the other part is located inside the cylindrical shell 1 and is used to connect to the connecting part 33. In actual application scenarios, the transmission part 32 can convert the rotational motion of the driving part 31 into circumferential swing. For example, the transmission part 32 is a gear rack mechanism, in which the motor drives the gear to rotate, the gear engages with the rack, and the rotational motion is converted into the linear motion of the rack, and then the linear motion is converted into swing through the connecting rod; the transmission part 32 is a crank-connecting rod mechanism, in which the motor drives the crank to rotate, and the crank is connected to the connecting part 33 of the scraper plate 2 through the connecting rod, converting the circular motion into reciprocating swing; the transmission part 32 is a worm gear mechanism, in which the motor drives the worm, the worm drives the worm wheel to rotate, and the worm wheel outputs the swinging motion through the eccentric shaft or connecting rod.

[0074] The connecting portion 33 is directly connected to the scraping plate 2 to ensure that the scraping plate 2 and the transmission portion 32 move synchronously, with the axis of the cylindrical shell 1 as the rotation center.

[0075] In some possible implementations disclosed in this application, see Figures 1 to 3 The cam 322 is engaged with the drive shaft 321 and the cam 323 is engaged with the drive gear 322, and the cam 323 is engaged with the drive gear 322.

[0076] In this embodiment, the center of curvature of the arc-shaped transmission tooth chain 323 coincides with the axis of the cylindrical shell 1. The swing trajectory of the transmission tooth chain 323 is a circular arc, which perfectly matches the circumferential direction of the inner wall of the cylindrical shell 1. This ensures that the movement direction of the scraper 2 always follows the tangential direction of the cylinder, ensuring that the outer edge of the scraper 2 fits tightly against the inner wall, and the physical scraping path of dust is continuous and uniform, avoiding blind spots caused by deviations in the movement trajectory. At the same time, the transmission gear 322 drives the tooth chain to swing back and forth in a forward and reverse direction, driving the scraper 2 to periodically reciprocate within the circumferential range, repeatedly impacting the dust layer. Combined with the pre-loosening action of the sootblower 5, this can more effectively break the adhesion of dust to the inner wall.

[0077] For electrostatic precipitators with a multi-chamber structure, the drive shaft 321 extends axially (i.e., longitudinally) along the cylindrical shell 1, penetrating multiple electric field chambers. Alternatively, a drive shaft 321 is provided in each of the multiple electric field chambers, with two adjacent drive shafts 321 connected via a coupling. It can be understood that the drive shaft 321 is the backbone of power transmission, used to transmit the torque of the drive unit 31 to the transmission gears 322 in each electric field chamber, thereby achieving linkage between the scraping mechanisms of each electric field chamber.

[0078] The transmission gear 322 is mounted on the transmission shaft 321 and is keyed or splined to the transmission shaft 321 to ensure synchronous rotation. It is understood that the transmission gear 322 can convert the rotational motion of the transmission shaft 321 into a circumferential driving force, and through its tooth profile, it meshes with the transmission gear chain 323, driving the transmission gear chain 323 to oscillate.

[0079] The transmission gear chain 323 is arc-shaped, with its center of curvature coinciding with the axis of the cylindrical shell 1. That is, the center of the transmission gear chain 323 is aligned with the center of the cylindrical shell 1. It is understood that the transmission gear chain 323 has a tooth profile on its inner side that matches the transmission gear 322, and is fixed to the connecting portion 33 on its outer side.

[0080] Among them, the connecting part 33 can be a rigid connecting rod or flange, one end of which is connected to the transmission gear chain 323 and the other end is relatively fixed to the scraper plate 2, used to transmit the swing of the arc-shaped transmission gear chain 323 to the scraper plate 2 to ensure that the two move synchronously.

[0081] Specifically, in actual application scenarios, the drive unit 31 drives the transmission shaft 321 and the transmission gear 322 to rotate alternately clockwise / counterclockwise by switching between forward and reverse rotations. When the transmission gear 322 rotates forward and reverse, the transmission gear chain 323 performs a reciprocating circular arc swing with the axis of the cylindrical shell 1 as the rotation center, that is, a pendulum motion, with a swing angle of 60° to 120°. During this process, the swing trajectory of the arc-shaped transmission gear chain 323 is completely in line with the inner wall of the cylindrical shell 1, ensuring that the outer edge of the scraper plate 2 is always in close contact with the inner wall, avoiding blind spots in dust cleaning; at the same time, the scraper plate 2 is subjected to alternating force in both directions, reducing unilateral wear and extending its service life; in addition, the reverse swing can also attempt to remove dust obstructions.

[0082] In some possible implementations disclosed in this application, see Figures 1 to 3As shown, the connecting part 33 includes a swing bracket 331 and a scraping frame 332; the swing bracket 331 is suspended inside the cylindrical shell 1 through a rotating bearing, the axis of the rotating bearing coincides with the axis of the cylindrical shell 1, the transmission gear chain 323 is connected to the swing bracket 331, and the swing bracket 331 is used to convert the reciprocating swinging motion of the transmission gear chain 323 into its own rotational swing around the axis of the cylindrical shell 1; the scraping frame 332 is arranged at the bottom of the swing bracket 331, and the scraping frame 332 extends along the circumferential direction of the cylindrical shell 1, the scraping plate 2 is connected to the scraping frame 332, and the scraping plate 2 is arranged along the radial outer surface of the scraping frame 332.

[0083] In this embodiment, the swing bracket 331 is suspended from the cylindrical axis via a rotating bearing, ensuring that the rotation center of the scraper blade 2 is completely aligned with the cylindrical shell 1. This ensures a uniform gap between the outer edge of the scraper blade 2 and the inner wall, preventing uneven scraping or jamming caused by eccentricity. Furthermore, the scraper frame 332 extends circumferentially and supports multiple scrapers 2, evenly distributing the scraping force across the entire circumference of the inner wall and reducing single-point stress concentration. For example, under high dust load conditions, the frame structure prevents deformation of the scraper blade 2 due to localized excessive load.

[0084] The swing bracket 331 is the motion conversion unit of the connecting portion 33. It is suspended at the center of the cylindrical shell 1 via a rotary bearing, ensuring that the swing bracket 331 rotates around the center of the cylindrical shell 1. It is understood that the swing bracket 331 is roughly triangular in shape, with its apex corresponding to the center of rotation of the swing bracket 331, namely, the vertex connected to the rotary bearing. This vertex is fixed to the axis of the cylindrical shell 1, forming the fulcrum for the swing. The base opposite the apex is the free end of the swing bracket 331, extending along the circumferential direction of the cylindrical shell 1 and used to connect to the scraper frame 332. When the swing bracket 331 rotates around the axis, the base drives the scraper frame 332 to swing in an arc centered on the apex.

[0085] The scraper frame 332 is the core support unit of the connecting portion 33. It is located at the bottom of the swing bracket 331 and extends along the circumference of the cylindrical shell 1. It serves as a mounting support for the scraper blade 2 and transmits motion. It is understood that the scraper frame 332 can be a semi-open or U-shaped structure, with one side fixedly connected to the swing bracket 331 and the other side forming the mounting surface for the scraper blade 2.

[0086] Specifically, the transmission gear chain 323, the swing bracket 331 and the scraping frame 332 are all located in a plane parallel to the cross section of the cylindrical shell 1, that is, a plane perpendicular to the axial direction of the shell, which can reduce torque loss or interference caused by spatial cross motion.

[0087] In some possible implementations disclosed in this application, see Figures 1 to 3As shown, the scraper plate 2 includes a first scraper plate 212 and a second scraper plate 222; at least two first scraper plates 212 are provided, and at least two first scraper plates 212 are respectively provided at both ends of the scraper frame 332; multiple second scraper plates 222 are provided, and multiple second scraper plates 222 are located between at least two first scraper plates 212; wherein, the first scraper plate 212 includes an auxiliary scraping portion 211 and a guide portion 212, and the guide portion 212 is provided on the side of the auxiliary scraping portion 211 away from the second scraper plate 222, and the inclination angle between the working surface of the guide portion 212 and the inner wall of the cylindrical shell 1 is smaller than the inclination angle between the working surface of the auxiliary scraping portion 211 and the inner wall of the cylindrical shell 1; wherein, the second scraper plate 222 includes two symmetrically arranged main scraping portions 221, and the inclination angles between the working surfaces of the two main scraping portions 221 and the inner wall of the cylindrical shell 1 are the same.

[0088] Among them, the first scraper plate 212 is arranged at both ends of the scraper frame 332, and can preferentially contact the area with thicker dust accumulation inside the cylindrical shell 1, and quickly reduce the total amount of dust accumulation by breaking through the two ends, creating a more efficient cleaning space for the second scraper plate 222 in the middle.

[0089] Specifically, in the first scraper 212, the larger cutting angle of the auxiliary scraper 211 gives the auxiliary scraper 211 a stronger mechanical wedging ability, enabling it to penetrate deep into the bottom of a thick, firmly bonded dust layer or a block of dust accumulation. The swinging thrust of the scraper frame 332 breaks the adhesion between the dust layer and the inner wall, achieving efficient stripping of stubborn dust accumulation. The guide portion 212 is arranged on the side of the auxiliary scraper 211 away from the second scraper 222. The angle between its working surface and the inner wall of the cylindrical shell 1 is small, approaching the tangential direction. As the scraper frame 332 moves toward the extreme position, it can guide the dust to move along the tangential direction of the cylinder, causing the dust to converge toward the middle area between the two first scrapers 212, that is, the area covered by the second scraper 222, preventing the dust accumulated at the end from splashing outward due to the high-speed movement of the scraper 2 or re-adhering to the cleaned inner wall.

[0090] Among them, the second scraper plate 222 is located between the two first scraper plates 212. Through the dense coverage of multiple second scraper plates 222, the thin dust layer or residual ash in the middle of the cylindrical shell 1 is finely scraped off, achieving a layered cleaning effect of rough cleaning at the end and fine cleaning in the middle, thereby improving the overall cleaning efficiency.

[0091] Specifically, in the second scraper plate 222, the two main scraping parts 221 constituting the second scraper plate 222 have the same inclination angle, so that the second scraper plate 222 applies uniform radial pressure to the inner wall of the cylinder during rotation, which not only ensures consistent cleaning force, but also offsets lateral deviation through symmetrical force, thereby improving the stability of equipment operation and extending the service life of the scraper plate 2 and the cylinder shell 1.

[0092] Furthermore, in this embodiment, the inclination angle between the working surface of the main scraping portion 221 and the inner wall of the cylindrical shell 1 is smaller than the inclination angle between the working surface of the auxiliary scraping portion 211 and the inner wall of the cylindrical shell 1, but larger than the inclination angle between the working surface of the guide portion 212 and the inner wall of the cylindrical shell 1. Thus, a dust cleaning chain is formed with strong demolition at the end, fine scraping in the middle, and flow diversion and control.

[0093] In some possible implementations disclosed in this application, see Figure 2 and Figure 3 As shown, the scraping mechanism also includes a dust suction pipe 8 and a dust blowing pipe 9; a dust suction channel 6 and a dust blowing channel 7 are also provided inside the swing bracket 331 and the scraping frame 332; one end of the dust suction pipe 8 is connected to the dust suction device 4, and the other end is connected to the outlet of the dust suction channel 6 of the swing bracket 331 through a first rotary joint, the inlet of the dust suction channel 6 of the swing bracket 331 is connected to the outlet of the dust suction channel 6 of the scraping frame 332, and the inlet of the dust suction channel 6 of the scraping frame 332 is connected to the outlet of the dust suction channel 6 of the scraping plate 2; one end of the dust blowing pipe 9 is connected to the dust blowing device 5, and the other end is connected to the inlet of the dust blowing channel 7 of the swing bracket 331 through a second rotary joint, the outlet of the dust blowing channel 7 of the swing bracket 331 is connected to the inlet of the dust blowing channel 7 of the scraping frame 332, and the outlet of the dust blowing channel 7 of the scraping frame 332 is connected to the inlet of the dust blowing channel 7 of the scraping plate 2.

[0094] In this embodiment, when the dust scraper 2 scrapes away the accumulated dust, it simultaneously absorbs the raised dust particles to prevent the dust from being suspended or accumulated again in the cylindrical shell 1.

[0095] The swing bracket 331 serves as a central structure, with the interior hollowed out to form an air passage, and both ends are sealedly connected to the rotary joint and the scraping frame 332 respectively.

[0096] The scraping frame 332 is an annular structure extending along the circumference of the cylinder, and is also provided with double channels inside, which are seamlessly connected to the channels of the swing bracket 331 through flanges or welding.

[0097] Among them, the scraper plate 2 adopts a hollow structure, extending the suction / blowing channel to the vicinity of the working surface to form an integrated blowing and suction end effector.

[0098] The first rotating structure is used to connect the fixed dust suction pipe 8 and the rotating swing bracket 331, allowing the two to maintain air communication when they rotate relative to each other.

[0099] Among them, the function of the second rotary joint is similar to that of the first rotary joint, but it needs to withstand higher air pressure and can adopt a carbide sealing surface and a spring pre-tightening structure.

[0100] Specifically, in actual application scenarios, the dust suction process is as follows: first, the dust suction device 4 generates negative pressure, which is transmitted to the first rotary joint through the dust suction pipe 8; then, under the action of negative pressure, the dust scraped off by the scraper plate 2 enters the dust suction channel 6 of the scraper plate 2 from the dust suction port; finally, the dust is extracted through the dust suction pipe 8 of the scraper frame 332 and the swing bracket 331. The dust blowing process is as follows: first, the dust blowing device 5 generates high-pressure gas, which is transported to the second rotary joint through the dust blowing pipe 9; then, the high-pressure gas enters the dust blowing channel 7 of the swing bracket 331 through the second rotary joint, and then reaches the scraper plate 2 through the dust blowing channel 7 of the scraper frame 332; finally, the gas is ejected from the dust blowing port on the working surface of the scraper plate 2, forming a high-speed airflow that impacts and loosens the dust accumulated on the inner wall.

[0101] In some possible implementations disclosed in this application, see Figure 2 As shown, both the soot suction pipe 8 and the soot blowing pipe 9 are provided with a valve group 10 .

[0102] In this embodiment, by arranging the valve group 10 on the soot suction pipe 8 and the soot blowing pipe 9, accurate control of the gas path can be achieved to dynamically optimize the soot cleaning process.

[0103] Among them, in some specific examples, when dealing with loose dust accumulation, the valves on the soot blowing pipe 9 and the soot suction pipe 8 are opened at the same time, so that the negative pressure system collects the dust synchronously at the moment when the high-pressure airflow blows away the dust to avoid dust diffusion; in other specific examples, when dealing with ash layers with strong adhesion, the valve on the soot blowing pipe 9 is opened first to loosen the dust accumulation, and then the valve on the soot suction pipe 8 is opened after a certain delay to ensure that the crushed ash residue is effectively captured.

[0104] In some possible implementations disclosed in this application, see Figure 2 and Figure 3 As shown, an ash discharge trough 11 is provided at the bottom of the inner wall of the cylindrical shell 1. The ash discharge trough 11 extends along the axial direction of the cylindrical shell 1. An ash conveying chain is provided in the ash discharge trough 11 for receiving and conveying fine ash falling into the ash discharge trough.

[0105] In this embodiment, the ash discharge chute 11 extends axially along the cylindrical shell 1, guiding fine ash, dust, and other tiny particles scraped off by the scraping mechanism into the chute 11, preventing the fine ash from accumulating or remaining at the bottom of the inner wall of the cylindrical shell 1, thereby improving the targeted and efficient cleaning of accumulated ash. The ash conveyor chain actively transports the fine ash within the chute 11 to a designated outlet, automating the process from collection to transportation of accumulated ash and reducing the frequency of manual cleaning.

[0106] The fine dust scraped off by the dust scraping plate 2 naturally falls into the dust discharge chute 11 under the action of gravity.

[0107] The scraper of the ash conveying chain moves at the bottom of the ash discharge chute 11, scraping up the deposited fine ash and pushing it forward.

[0108] It should be noted that, in this embodiment, the ash discharge chute 11 not only receives the fine ash scraped off by the ash scraper 2 , but is also connected to the outlet of the ash suction device 4 , forming a dual ash cleaning path.

[0109] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0110] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A scraping mechanism, characterized in that: include: A dust scraper, the dust scraper being arranged in the inner cavity of the cylindrical shell, the dust scraper being in contact with the dust layer adhered to the inner wall of the cylindrical shell, and the dust scraper being able to move relative to the cylindrical shell in the circumferential direction of the cylindrical shell; In which, the working surface of the scraper plate is provided with multiple ash suction ports and multiple ash blowing ports, and the interior of the scraper plate is provided with ash suction channels and ash blowing channels, and the multiple ash suction ports and the multiple ash blowing ports are connected to the ash suction device and the ash blowing device respectively through the ash suction channels and the ash blowing channels.

2. The scraping mechanism according to claim 1, characterized in that: Also includes: A driving device is connected to the scraper plate and is used to drive the scraper plate to perform reciprocating swinging motion along the circumferential direction on the inner wall of the cylindrical shell.

3. The scraping mechanism according to claim 2, characterized in that: The driving device comprises: Driving part, transmission part and connecting part; The first end of the transmission part is connected to the driving part, and the second end is connected to the connecting part, for converting the power of the driving part into a circumferential swing of the connecting part; The connecting portion is also connected to the scraper plate, and the driving portion is used to drive the transmission portion to move, thereby driving the scraper plate through the connecting portion to perform the reciprocating swinging motion with the axis of the cylindrical shell as the rotation center.

4. The scraping mechanism according to claim 3, characterized in that: The transmission part includes: Drive shafts, drive gears and drive gear chains; The transmission shaft extends along the axial direction of the cylindrical shell, and the driving end of the driving part is connected to the transmission shaft for driving the transmission shaft to rotate; The transmission gear is sleeved on the transmission shaft, and the transmission gear rotates synchronously with the transmission shaft; The transmission tooth chain is meshed with the transmission gear, and the connecting portion is relatively fixed to the transmission tooth chain; In which, the transmission tooth chain is arc-shaped, and the center of curvature of the transmission tooth chain coincides with the axis of the cylindrical shell; when the driving part drives the transmission shaft to rotate forward and reverse, the transmission gear drives the transmission tooth chain to perform the reciprocating swinging motion with the axis of the cylindrical shell as the rotation center, and the reciprocating swinging motion of the transmission tooth chain is transmitted to the scraper plate through the connecting part, so that the scraper plate performs the reciprocating swinging motion synchronously.

5. The scraping mechanism according to claim 4, characterized in that: The connecting portion includes: Swing bracket and plastering frame; The swing bracket is suspended inside the cylindrical shell through a rotary bearing, the axis of the rotary bearing coincides with the axis of the cylindrical shell, the transmission gear chain is connected to the swing bracket, and the swing bracket is used to convert the reciprocating swinging motion of the transmission gear chain into its own rotational swing around the axis of the cylindrical shell; The scraping frame is arranged at the bottom of the swing bracket, and the scraping frame extends along the circumferential direction of the cylindrical shell. The scraping plate is connected to the scraping frame, and the scraping plate is arranged along the radial outer side surface of the scraping frame.

6. The scraping mechanism according to claim 5, characterized in that: The scraper plate comprises: a first scraper and a second scraper; At least two of the first scraping plates are provided, and the at least two first scraping plates are respectively provided at both ends of the scraping frame; There are multiple second scraping boards, and the multiple second scraping boards are located between at least two of the first scraping boards; The first scraper plate includes an auxiliary scraping portion and a guide portion, the guide portion is provided on a side of the auxiliary scraping portion away from the second scraper plate, and the inclination angle between the working surface of the guide portion and the inner wall of the cylindrical shell is smaller than the inclination angle between the working surface of the auxiliary scraping portion and the inner wall of the cylindrical shell; The second scraper plate includes two symmetrically arranged main scraping parts, and the working surfaces of the two main scraping parts have the same inclination angle with the inner wall of the cylindrical shell.

7. The scraping mechanism according to claim 5, characterized in that: Also includes: Soot suction pipe and soot blowing pipe; The ash suction channel and the ash blowing channel are also provided inside the swing bracket and the ash scraping frame; One end of the ash suction pipe is connected to the ash suction device, and the other end is connected to the outlet of the ash suction channel of the swing bracket through a first rotary joint. The inlet of the ash suction channel of the swing bracket is connected to the outlet of the ash suction channel of the scraping frame. The inlet of the ash suction channel of the scraping frame is connected to the outlet of the ash suction channel of the scraping plate. One end of the soot blowing pipe is connected to the soot blowing device, and the other end is connected to the inlet of the soot blowing channel of the swing bracket through a second rotary joint. The outlet of the soot blowing channel of the swing bracket is connected to the inlet of the soot blowing channel of the scraping frame. The outlet of the soot blowing channel of the scraping frame is connected to the inlet of the soot blowing channel of the scraping plate.

8. The scraping mechanism according to claim 7, characterized in that: The soot suction pipe and the soot blowing pipe are both provided with valve groups.

9. The scraping mechanism according to claim 1, characterized in that: An ash discharge trough is provided at the bottom of the inner wall of the cylindrical shell, and the ash discharge trough extends along the axial direction of the cylindrical shell. An ash conveying chain is provided in the ash discharge trough, and the ash conveying chain is used to receive and convey the fine ash falling into the ash discharge trough.

10. An electrostatic precipitator, characterized in that: include: The scraping mechanism according to any one of claims 1 to 9; Among them, when the electrostatic precipitator is in the dust removal working state, the dust suction device is started synchronously; when the scraper performs circumferential scraping action on the inner wall of the cylindrical shell and the scraper is in a stuck state due to dust agglomeration or foreign matter obstruction, the dust blowing device is started.

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