Pulverized coal centrifugal powder selecting device and control system thereof

Abstract

The invention discloses a pulverized coal centrifugal powder selecting device and a control system thereof, and relates to the technical field of centrifugal powder selecting, the pulverized coal centrifugal powder selecting device comprises a machine body, a first sorting mechanism, a second sorting mechanism and a third sorting mechanism, the first sorting mechanism is arranged at the top of the machine body, the second sorting mechanism is installed on the outer wall of the machine body, and the third sorting mechanism is installed at the bottom of the machine body; pulverized coal which is not selected by the second sorting mechanism is borne and screened again through the third sorting mechanism, and a winnowing mechanism for hot air blowing is installed on the inner wall of the third sorting mechanism. By means of the arrangement mode that the first sorting mechanism, the second sorting mechanism and the third sorting mechanism are matched, preliminary two-stage mechanical separation of pulverized coal according to the granularity is achieved, screened powder with the granularity is subjected to wind power gravity winnowing, multi-stage separation of fine powder and secondary coarse powder with different coarse particles is achieved, and the situation that due to the fact that the sizes of the particles are not uniform, the separation efficiency is high is reduced. Therefore, the combustion effect, fly ash and large slag of the boiler are influenced.

Description

Technical Field

[0001] This invention relates to the field of centrifugal powder separation technology, and in particular to a pulverized coal centrifugal powder separation device and its control system. Background Technology

[0002] In coal-fired boilers and pulverized coal preparation systems, the fineness and uniformity of pulverized coal are key factors determining combustion efficiency, pollutant emissions, and the safe and economical operation of equipment. In existing technologies, the raw pulverized coal produced from the coal mill typically needs to be separated by a classifier to obtain pulverized coal of different particle sizes that meet the boiler's combustion requirements. Currently used classifiers, such as static separators, dynamic separators, or combined separators, still have some problems in practical applications. Traditional coal mills use air-classified air classifiers, which have a narrow range of particle size adjustment, making it difficult to achieve multi-stage, high-precision continuous separation of coal powder. The output particle size of the classifier is uniform, and the coal powder can only be coarsely separated into qualified and unqualified powders. This is not suitable for scenarios that require precise control of different particle size distributions. For example, different types of boilers are suitable for the combustion of coal powder with different uniformity, but cannot be used for the output of coal powder of different specifications, i.e., particles with insufficient uniformity, which affects the uniformity of combustion. Summary of the Invention

[0003] The purpose of this invention is to provide a pulverized coal centrifugal classifier and its control system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a pulverized coal centrifugal classifier, comprising: Organism; The first sorting mechanism is located on the top of the machine body and is used for multi-stage centrifugal screening of coal powder. The second sorting mechanism is installed on the outer wall of the machine body. The second sorting mechanism separates fine coal powder suitable for boiler combustion by air separation. The third sorting mechanism is installed at the bottom of the machine body. Coal powder that was not selected by the second sorting mechanism is carried and screened again by the third sorting mechanism. The inner wall of the third sorting mechanism is equipped with a hot air blowing air separation mechanism.

[0005] Preferably, the body comprises: The protective cylinder is a cylindrical structure used in conjunction with a coal mill. A fixing sleeve is disposed in the inner cavity of the protective cylinder; A servo motor, wherein the servo motor is fixed to the inner cavity of the fixed sleeve; The output shaft is connected to the output end of the servo motor via a coupling, and the top of the output shaft is connected to the first sorting mechanism.

[0006] Preferably, the first sorting mechanism includes: A rotating head is fixed to the top of the output shaft. The rotating head includes a rotating block and a protective cover. The rotating block is fixed to the top of the output shaft and is fixedly connected to the bottom of the first rotating cylinder and the second rotating cylinder. The rotating block rotates on the top of the fixed sleeve by multiple balls. The protective cover is fixed to the outer wall of the rotating block. The first rotating cylinder is fixed to the top of the rotating head, and the top of the first rotating cylinder is connected to the powder outlet end of the coal mill through a pipe. The second rotating cylinder is fixedly connected to the outer wall of the rotating head and is sleeved outside the first rotating cylinder; A connecting cover is fixed between the first rotating cylinder and the second rotating cylinder by screws. The connecting cover is used for cleaning and maintenance of the inner cavity at the top of the second rotating cylinder. A fitting ring is fixed to the outer wall of the second rotating cylinder, and a scraper is fitted to the outer wall of the fitting ring; A connecting groove is formed on the outer wall of the mating ring.

[0007] Preferably, the scraper includes: A positioning ring, which is fixed to the top of the inner wall of the protective cylinder; A slot is formed on one side of the inner wall of the positioning ring; A cleaning component, which slides between a positioning ring and a mating ring, is used for scraping and cleaning the inner wall of the protective cylinder and the outer wall of the second rotating cylinder. A pressing cylinder, which slides through the top of the cleaning component; The second ball bearing is rotatably embedded in the top of the pressing cylinder, and the second ball bearing is rotatably connected to the inner wall of the top cover of the protective cylinder; An insertion hole is provided on the top cover of the protective cylinder.

[0008] Preferably, the cleaning component includes: A protective ring is rotatably engaged between a positioning ring and a mating ring; A rotating rod, which is slidably inserted into one side of the protective ring, and the top of the rotating rod is slidably connected to the inner wall of the pressing cylinder; Scraper, the scraper being fixed to the bottom of the outer wall of the rotating rod; A movable groove is formed at the top of the rotating rod; A retaining plate, which slides through the inner cavity of the movable slot, is used for the movable engagement of the slot and the connecting slot; A movable rod, which slides through the middle of the rotating rod, and the bottom of the movable rod slides through the middle of the clamping plate; The first compression spring is sleeved on the outer wall of the movable rod and is located between the rotating rod and the pressing cylinder.

[0009] Preferably, the second sorting mechanism includes: The first carrier frame is fixedly inserted into the top of the protective cylinder, and the third sorting mechanism is located directly below the first carrier frame; The first discharge pipe is fixedly inserted into the outer wall of the first bearing frame and is used for the circulation of pulverized coal and hot air. The first ring cover is snapped onto the top of the first support frame by a sealing strip, and the first ring cover is used for the maintenance and cleaning of the first support frame.

[0010] Preferably, the third sorting mechanism includes: The second support frame is fixedly inserted into the bottom of the protective cylinder, and an air separation mechanism is provided in the middle of the second support frame; The second discharge pipe is fixedly inserted through the outer wall of the second bearing frame; The second ring cover is snapped onto the top of the second support frame by a sealing strip.

[0011] Preferably, the second carrier frame includes: A frame, which is fixedly connected to the bottom of the protective cylinder; The inner frame is integrally formed with the frame body and fixed to the inner ring of the frame body. The inner frame is located at the bottom of the rotating head. First ball bearing, multiple first ball bearings are rolled and embedded in the top of the inner frame; A connecting ring, which is integrally formed and fixed to the outer wall of the inner frame; A ring screen is fixed to the outer wall of a connecting ring, and the outer wall of the ring screen is fixedly connected to the inner wall of a protective cylinder.

[0012] Preferably, the air separation mechanism includes: An air inlet duct, which is connected to a heat pump; The annular tube is fixed to the inner wall of the frame by a fixing ring. One end of the air inlet pipe is fixedly inserted and connected to the outer wall of the annular tube, and the air inlet pipe communicates with the inner cavity of the annular tube. The air outlet ducts are arranged in a ring array and fixedly inserted into the inner wall of the frame. One end of each air outlet duct is fixedly inserted into the outer wall of the ring duct.

[0013] A control system for a pulverized coal centrifugal classifier includes the aforementioned pulverized coal centrifugal classifier and a controller electrically connected thereto, the controller being used to control the start and stop of the electrical equipment.

[0014] The technical effects and advantages of this invention are as follows: This invention utilizes a combination of a first sorting mechanism, a second sorting mechanism, and a third sorting mechanism. The centrifugal rotation of the first and second rotating drums in the first sorting mechanism, with progressively smaller mesh sizes, achieves initial two-stage mechanical separation of pulverized coal based on particle size. Subsequently, a controllable air separation mechanism further separates the sieved particles using both air and gravity, ultimately achieving multi-stage separation of fine and medium-coarse powders of varying coarseness. This invention is suitable for boilers with different particle sizes, reducing the impact of uneven particle size on boiler combustion performance, fly ash, and slag, and improving boiler combustion uniformity. The present invention, through the combination of the first and second support frames and the outwardly diffusing downward tilting structure, facilitates the collection and stable discharge of coal powder of different particle sizes. Furthermore, by opening and closing the first and second discharge pipes respectively, it is easy to quickly switch between coal powder discharge of two particle sizes. It can flexibly adapt to boilers with different coal powder fineness requirements, or supply coal powder to two boilers at the same time, thereby improving the practicality and multi-functionality of the equipment. This invention innovatively incorporates a cleaning component on the outer wall of the cooperating ring, enabling it to be linked with the second rotating drum. This allows for real-time switching of the scraper's state, and without shutting down the machine, the scraper can sequentially scrape and clean the inner wall of the protective cylinder and the outer wall of the second rotating drum through simple pressing and rotating operations. This effectively prevents coal dust adhesion and accumulation, improves the stability of the internal flow field and the efficiency of classification, and reduces downtime and maintenance time and frequency. This invention, through the arrangement of the cleaning component in conjunction with the connecting groove and the slot, facilitates the rotation and movement of the rotating rod within the protective cylinder by pressing the pressing cylinder. This allows the scraper on the rotating rod to scrape the inner wall of the protective cylinder and the outer wall of the second rotating cylinder. Simultaneously, the rotating rod can be engaged with the positioning ring and the mating ring respectively, enabling the cleaning component to be used in different states. This method is simple to operate and highly usable. Furthermore, when the cleaning component is not in use, it can cover the insertion hole at the top of the protective cylinder, reducing dust or air discharge and improving the actual performance of the device. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front cross-sectional view of the protective cylinder of the present invention; Figure 3 This is a schematic diagram of the overhead structure of the first rotating cylinder of the present invention; Figure 4 This is a schematic diagram of the overall structure of the frame of the present invention; Figure 5 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 6 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the overall structure of the protective ring of the present invention; Figure 8 This is a partial cross-sectional view of the rotating rod of the present invention; Figure 9 This is a top-view cross-sectional view of the card plate structure of the present invention.

[0016] In the attached diagram: 100, machine body; 101, protective cylinder; 102, fixed sleeve; 103, servo motor; 104, output shaft; 200, first sorting mechanism; 201, rotating head; 211, rotating block; 212, protective cover; 202, first rotating cylinder; 203, second rotating cylinder; 204, connecting cover; 205, mating ring; 206, connecting groove; 300, second sorting mechanism; 301, first bearing frame; 302, first discharge pipe; 303, first ring cover; 400, third sorting mechanism; 401, second bearing frame; 411, frame body; 4 12. Inner frame; 413. First ball bearing; 414. Connecting ring; 415. Ring screen; 402. Second discharge pipe; 403. Second ring cover; 500. Air separation mechanism; 501. Air inlet pipe; 502. Annular pipe; 503. Air outlet pipe; 600. Scraper; 601. Positioning ring; 602. Slot; 603. Cleaning component; 631. Protective ring; 632. Rotating rod; 633. Scraper; 634. Movable groove; 635. Card plate; 636. Movable rod; 637. First compression spring; 604. Pressing cylinder; 605. Second ball bearing; 606. Through hole. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides, for example Figures 1-9 The image shows a centrifugal coal powder separator.

[0019] Example 1: Includes a body 100, a first sorting mechanism 200, a second sorting mechanism 300, and a third sorting mechanism 400. The body 100 includes a protective cylinder 101, a fixed sleeve 102, a servo motor 103, and an output shaft 104. The protective cylinder 101 is a cylindrical structure used in conjunction with a coal mill. The fixed sleeve 102 is disposed in the inner cavity of the protective cylinder 101. The servo motor 103 is fixed in the inner cavity of the fixed sleeve 102 and is electrically connected to an external power supply through an external controller. The output shaft 104 is connected to the output end of the servo motor 103 through a coupling. The top of the output shaft 104 is rotatably connected to the top of the fixed sleeve 102 through a bearing. The top of the output shaft 104 is connected to the first sorting mechanism 200. Through the control and drive of the servo motor 103, the output shaft 104 can drive the first sorting mechanism 200 to rotate, so that the coal powder entering the inner cavity of the first sorting mechanism 200 can be centrifugally sorted. The first sorting mechanism 200 is located on the top of the machine body 100. It is used for multi-stage centrifugal screening of pulverized coal. The first sorting mechanism 200 includes a rotating head 201, a first rotating cylinder 202, a second rotating cylinder 203, a connecting cover 204, a mating ring 205, and a connecting groove 206. The rotating head 201 is fixed to the top of the output shaft 104 and includes a rotating block 211 and a protective cover 212. The rotating block 211 is fixed to the top of the output shaft 104 and is fixedly connected to the bottom of the first rotating cylinder 202 and the second rotating cylinder 203. The rotating block 211 rotates on the fixed sleeve 102 via multiple ball bearings. At the top, a protective cover 212 is fixed to the outer wall of the rotating block 211. The protective cover 212 is used to protect the connection between the top ball bearing of the fixed sleeve 102 and the rotating block 211 from large particulate impurities, reducing the phenomenon of rotation jamming. The first rotating cylinder 202 is fixed to the top of the rotating head 201. The top of the first rotating cylinder 202 is connected to the powder discharge end of the coal mill through a pipe. The coal mill is an existing coal powder grinding machine. The powder discharge end of the coal mill is connected to the pipe, and the pipe is fitted and rotated through the middle of the first rotating cylinder 202, so that the coal powder in the pipe can stably enter the inner cavity of the first rotating cylinder 202, which facilitates the re-screening of the coal powder in the coal mill and avoids To prevent uneven coal powder entering the boiler and thus reduce its impact on combustion efficiency, fly ash, and slag, a second rotating cylinder 203 is fixedly connected to the outer wall of the rotating head 201. The second rotating cylinder 203 is fitted over the first rotating cylinder 202. Both the first and second rotating cylinders 202 and 203 have mesh covers with different mesh sizes at the bottom and circular cylindrical plates at the top. The mesh size of the first rotating cylinder 202 is larger than that of the second rotating cylinder 203, facilitating centrifugal screening of the coal powder at the bottom of both cylinders. This allows larger coal particles to be separated according to size on the first rotating cylinder. The inner cavities of the first rotating cylinder 202 and the second rotating cylinder 203 facilitate the reduction of large coal powder lumps discharged from the device. A split plate is installed on the top of the first rotating cylinder 202 by screws. A connecting cover 204 is fixed between the first rotating cylinder 202 and the second rotating cylinder 203 by screws. The connecting cover 204 is used for cleaning and maintenance of the inner cavity at the top of the second rotating cylinder 203. Through the split plate and the connecting cover 204, it is convenient to clean the inner cavities of the first rotating cylinder 202 and the second rotating cylinder 203 separately when the device is stopped for maintenance, thereby improving the service life of the device. The mating ring 205 is fixed to the outer wall of the second rotating cylinder 203, and the connecting groove 206 is opened on the outer wall of the mating ring 205.

[0020] In addition, the second sorting mechanism 300 is installed on the outer wall of the body 100. The second sorting mechanism 300 uses air separation to select fine coal powder suitable for boiler combustion. The second sorting mechanism 300 includes a first support frame 301, a first discharge pipe 302, and a first ring cover 303. The first support frame 301 is fixedly inserted into the top of the protective cylinder 101. The third sorting mechanism 400 is located directly below the first support frame 301. The first discharge pipe 302 is fixedly inserted into the outer wall of the first support frame 301. The first discharge pipe 302 is used for the circulation of coal powder and hot air. The powder discharge end of the first discharge pipe 302 is connected to the boiler, so that the uniformly sized coal powder inside the first discharge pipe 302 can directly enter the boiler cavity for combustion, thereby improving the boiler's combustion efficiency. The first ring cover 303 is snapped onto the top of the first support frame 301 by a sealing strip. The first ring cover 303 is used for maintenance and cleaning of the first support frame 301. The sealing strip allows the first ring cover 303 to seal the top of the first support frame 301 and to be disassembled from the first support frame 301, facilitating cleaning or maintenance of the inner cavity of the first support frame 301. The bottom of the first support frame 301 has an outward and downward sloping structure, which facilitates the upward blowing of powder from the second rotating drum 203 into the inner cavity of the first discharge pipe 302 by the airflow, and then discharges from the inner cavity of the first discharge pipe 302 with the airflow, improving the stability of powder discharge and making it suitable for convenient discharge of uniform coal powder.

[0021] Furthermore, the third sorting mechanism 400 is installed at the bottom of the machine body 100. Coal powder not selected by the second sorting mechanism 300 is carried and screened again by the third sorting mechanism 400. The third sorting mechanism 400 includes a second support frame 401, a second discharge pipe 402, and a second ring cover 403. The second support frame 401 is fixedly inserted into the bottom of the protective cylinder 101. The bottom of the inner wall of the second support frame 401 has an outwardly sloping structure to facilitate the falling of particles. The second discharge pipe 402 is fixedly inserted into the outer wall of the second support frame 401. The second ring cover 403 is sealed by a sealing strip. The second ring cover 403 is snapped onto the top of the second support frame 401 and is used for opening and closing maintenance of the top of the second support frame 401. When the boiler requires the combustion of fine pulverized coal, the inner cavity of the second discharge pipe 402 is blocked, so that there is only one air outlet of the first discharge pipe 302 on the device, which facilitates the stable discharge of pulverized coal with suitable fineness and uniformity. The slightly larger powder particles screened out by the second rotating drum 203 can be screened again through the second support frame 401, which facilitates the post-processing of powder particles larger than those discharged from the first discharge pipe 302, so that it can be adapted to the combustion of large-particle boilers.

[0022] Specifically, the second support frame 401 includes a frame body 411, an inner frame 412, first ball bearings 413, a connecting ring 414, and a ring screen 415. The frame body 411 is fixedly connected to the bottom of the protective cylinder 101. The inner wall of the frame body 411 has an inner chamfer structure to facilitate the falling of powder particles. The inner frame 412 is integrally formed with the frame body 411 and fixed to the inner ring of the frame body 411. The inner frame 412 is located at the bottom of the rotating head 201. Multiple first ball bearings 413 are rolled and embedded in the top of the inner frame 412, and the first ball bearings 413 are rolled and connected to the bottom of the rotating block 211, so that the inner frame 412 can assist in supporting the rotating block 211 and improve the stability of the device structure. The connecting ring 414 is integrally formed with the outer wall of the inner frame 412 and fixed to the outer wall of the inner frame 412. The ring screen 415 is fixed to the outer wall of the connecting ring 414. The outer wall of 415 is fixedly connected to the inner wall of the protective cylinder 101. The ring screen 415 is a mesh screen structure, and the mesh aperture of the ring screen 415 is the same as the mesh aperture at the bottom of the second rotating cylinder 203, which facilitates the flow of the screened particles at the top of the frame 411. This allows the powder screened by the second rotating cylinder 203 to enter the inner cavity of the first bearing frame 301 and the frame 411 respectively for different particle sizes. When the powder larger than the powder discharged from the first discharge pipe 302 is put into the corresponding large particle boiler, the inner cavity of the first discharge pipe 302 is sealed, so that the coal powder particles at the bottom of the inner cavity of the frame 411 can be put into use with the hot air through the connection of the second discharge pipe 402 to the boiler. When the coal powder of different particle sizes is used alone, it does not affect the screening of coal powder of different particle sizes, thereby improving the multi-functionality and practicality of the device.

[0023] Furthermore, a hot air separation mechanism 500 is installed on the inner wall of the third sorting mechanism 400, and the air separation mechanism 500 is located in the middle of the second support frame 401. The air separation mechanism 500 includes an air inlet pipe 501, an annular pipe 502, and an air outlet pipe 503. The air inlet pipe 501 is connected to a hot air pump, and the air inlet end of the hot air pump is connected to a hot air source. The annular pipe 502 is fixed to the inner wall of the frame 411 by a fixing ring. One end of the air inlet pipe 501 is fixedly inserted and connected to the outer wall of the annular pipe 502. The air inlet pipe 501 and the annular pipe... The inner cavity of 502 is interconnected, and multiple air outlet pipes 503 are fixedly inserted into the inner wall of the frame 411 in a ring array. The bottom of the air outlet pipe 503 is tightly fitted and fixed to the bottom of the connecting ring 414 to prevent dust from accumulating between the connecting ring 414 and the inner wall of the air outlet pipe 503. One end of the air outlet pipe 503 is fixedly inserted and connected to the outer wall of the ring pipe 502. The air outlet pipe 503 is used to blow air in a ring to the top of the frame 411, so that the light, fine and uniform coal powder can enter the inner cavity of the first bearing frame 301 for use.

[0024] Example 2: Based on Example 1, a scraper 600 is fitted to the outer wall of the mating ring 205. The scraper 600 includes a positioning ring 601, a groove 602, a cleaning component 603, a pressing cylinder 604, a second ball bearing 605, and an insertion hole 606. The positioning ring 601 is fixed to the top of the inner wall of the protective cylinder 101 and is an annular structure that fits onto the mating ring 205. The groove 602 is opened on one side of the inner wall of the positioning ring 601. The cleaning component 603 slides between the positioning ring 601 and the mating ring 205 and is used for scraping and cleaning the inner wall of the protective cylinder 101 and the outer wall of the second rotating cylinder 203. The pressing cylinder 604 slides through the cleaning component. The top of the cleaning component 603 has a second ball bearing 605 that is rolled and embedded in the top of the pressing cylinder 604. The second ball bearing 605 is rolled and connected to the inner wall of the top cover of the protective cylinder 101. An insertion hole 606 is opened on the top cover of the protective cylinder 101. The insertion hole 606 is a hole structure that matches the second ball bearing 605. The pressing cylinder 604 is slidably inserted and connected to the inner cavity of the insertion hole 606, so that the pressing cylinder 604 can extend out of the top of the protective cylinder 101 and rotate the cleaning component 603. This allows the cleaning component 603 to scrape and clean the inner wall of the protective cylinder 101 and the outer wall of the second rotating cylinder 203 respectively, avoiding excessive adhesion of coal powder and improving the coal powder discharge efficiency.

[0025] Specifically, the cleaning component 603 includes a protective ring 631, a rotating rod 632, a scraper 633, a movable groove 634, a retaining plate 635, a movable rod 636, and a first compression spring 637. The protective ring 631 is rotatably engaged between the positioning ring 601 and the mating ring 205. The protective ring 631 is composed of two large rings and multiple cylinders, which allows it to shield the gap between the retaining groove 602 and the mating ring 205, reducing the amount of dust entering the top cavity of the protective cylinder 101. The rotating rod 632 is slidably inserted into one side of the protective ring 631. The top of the rotating rod 632 is slidably connected to the inner wall of the pressing cylinder 604. The scraper 633 is fixed to the bottom of the outer wall of the rotating rod 632. The scraper 633 is made of wear-resistant rubber. The rotating rod 632 is located in the center of the protective cylinder 101 and the second rotating cylinder 203. By rotating the rotating rod 632 180°, the scraper 633 can scrape and clean the inner wall of the protective cylinder 101 and the outer wall of the second rotating cylinder 203 respectively. A movable groove 634 is formed at the top of the rotating rod 632. A retaining plate 635 slides through the inner cavity of the movable groove 634. The retaining plate 635 has an inclined groove in the middle. The retaining plate 635 is used for the movable engagement of the retaining groove 602 and the connecting groove 206. A movable rod 636 slides through the middle of the rotating rod 632. The bottom of the movable rod 636 slides through the middle of the retaining plate 635. The top of the movable rod 636 is fixedly connected to the inner wall of the pressing cylinder 604, so that the pulling of the movable rod 636 can drive the retaining plate 634. 35 slides horizontally, so that the card plate 635 can be inserted into the inner cavity of the card slot 602 and the connecting slot 206 respectively. The first compression spring 637 is sleeved on the outer wall of the movable rod 636. The first compression spring 637 is located between the rotating rod 632 and the pressing cylinder 604. The top of the first compression spring 637 is fixedly connected to the top of the inner wall of the pressing cylinder 604, and the bottom of the first compression spring 637 is fixedly connected to the top of the rotating rod 632, so that the pressing cylinder 604 can elastically press on the top of the cleaning part 603.

[0026] The first compression spring 637 at the top of the cleaning component 603 elastically presses the pressing cylinder 604 through the insertion hole 606, allowing the pressing cylinder 604 to be pressed into the inner cavity of the protective cylinder 101. Simultaneously, the movable rod 636 moves downwards, causing the clamping plate 635 to move into the inner cavity of the connecting groove 206, facilitating the insertion of the cleaning component 603 into the inner cavity of the connecting groove 206. This allows the second rotating cylinder 203 to rotate, driving the cleaning component 603 to rotate, enabling the scraper 633 to scrape and clean the inner wall of the protective cylinder 101. When the cylinder returns to the position of the insertion hole 606 after one revolution, the pressing cylinder... Unaffected by the pressure of the top cover of the protective cylinder 101, the pressing cylinder 604 slides out of the inner cavity of the insertion hole 606, causing the first compression spring 637 to pull up, making it easy for the clamping plate 635 to slide into the inner cavity of the corresponding clamping groove 602, so that the normal use of the second rotating cylinder 203 is not affected. When the pressing cylinder 604 is pressed to the middle position, the clamping plate 635 is precisely embedded in the inner cavity of the movable groove 634, so that the rotation of the rotating rod 632 is not affected, making it easy to rotate the scraper 633 180°, so that the scraper 633 can clean the outer wall of the second rotating cylinder 203.

[0027] A control system for a pulverized coal centrifugal classifier includes the aforementioned pulverized coal centrifugal classifier and a controller electrically connected thereto, the controller being used to control the start and stop of the electrical equipment.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pulverized coal centrifugal classifier, characterized in that, include: Body (100); The first sorting mechanism (200) is located on the top of the machine body (100) and is used for multi-stage centrifugal screening of coal powder. The second sorting mechanism (300) is installed on the outer wall of the body (100). The second sorting mechanism (300) separates fine coal powder suitable for boiler combustion by air separation. The third sorting mechanism (400) is installed at the bottom of the machine body (100). The coal powder not selected by the second sorting mechanism (300) is carried and screened again by the third sorting mechanism (400). The inner wall of the third sorting mechanism (400) is equipped with a hot air blowing air separation mechanism (500).

2. The pulverized coal centrifugal classifier according to claim 1, characterized in that, The body (100) includes: The protective cylinder (101) is a cylindrical structure used in conjunction with a coal mill. A fixing sleeve (102) is disposed in the inner cavity of the protective cylinder (101); Servo motor (103), the servo motor (103) is fixed in the inner cavity of the fixing sleeve (102); Output shaft (104) is connected to the output end of servo motor (103) via a coupling, and the top of output shaft (104) is connected to first sorting mechanism (200).

3. The pulverized coal centrifugal classifier according to claim 2, characterized in that, The first sorting mechanism (200) includes: A rotating head (201) is fixed to the top of the output shaft (104). The rotating head (201) includes a rotating block (211) and a protective cover (212). The rotating block (211) is fixed to the top of the output shaft (104). The rotating block (211) is fixedly connected to the bottom of the first rotating cylinder (202) and the second rotating cylinder (203). The rotating block (211) rotates on the top of the fixed sleeve (102) by multiple balls. The protective cover (212) is fixed to the outer wall of the rotating block (211). The first rotating cylinder (202) is fixed to the top of the rotating head (201), and the top of the first rotating cylinder (202) is connected to the powder outlet end of the coal mill through a pipe; The second rotating cylinder (203) is fixedly connected to the outer wall of the rotating head (201) and is sleeved on the outside of the first rotating cylinder (202); A connecting cover (204) is fixed between the first rotating cylinder (202) and the second rotating cylinder (203) by screws. The connecting cover (204) is used for cleaning and maintenance of the inner cavity at the top of the second rotating cylinder (203). A fitting ring (205) is fixed to the outer wall of the second rotating cylinder (203), and a scraper (600) is fitted to the outer wall of the fitting ring (205). A connecting groove (206) is formed on the outer wall of the mating ring (205).

4. The pulverized coal centrifugal classifier according to claim 3, characterized in that, The scraper (600) includes: Positioning ring (601), the positioning ring (601) is fixed to the top of the inner wall of the protective cylinder (101); A card slot (602) is formed on one side of the inner wall of the positioning ring (601); Cleaning component (603), which slides between positioning ring (601) and mating ring (205), is used for scraping and cleaning the inner wall of the protective cylinder (101) and the outer wall of the second rotating cylinder (203); Pressing cylinder (604), which slides through the top of cleaning component (603); The second ball (605) is rotatably embedded in the top of the pressing cylinder (604), and the second ball (605) is rotatably connected to the inner wall of the top cover of the protective cylinder (101); An insertion hole (606) is provided on the top cover of the protective cylinder (101).

5. The pulverized coal centrifugal classifier according to claim 4, characterized in that, The cleaning component (603) includes: A protective ring (631) is rotatably engaged between a positioning ring (601) and a mating ring (205); Rotating rod (632), the rotating rod (632) is slidably inserted into one side of the protective ring (631), and the top of the rotating rod (632) is slidably inserted into the inner wall of the pressing cylinder (604); Scraper (633), said scraper (633) is fixed to the bottom of the outer wall of the rotating rod (632); A movable slot (634) is provided at the top of the rotating rod (632); A retaining plate (635) is slidably inserted into the inner cavity of the movable groove (634), and the retaining plate (635) is used for the movable engagement of the retaining groove (602) and the connecting groove (206); Movable rod (636), the movable rod (636) slides through the middle of the rotating rod (632), and the bottom of the movable rod (636) slides through the middle of the clamping plate (635); The first compression spring (637) is sleeved on the outer wall of the movable rod (636) and is located between the rotating rod (632) and the pressing cylinder (604).

6. The pulverized coal centrifugal classifier according to claim 1, characterized in that, The second sorting mechanism (300) includes: The first carrier frame (301) is fixedly inserted into the top of the protective cylinder (101), and the third sorting mechanism (400) is located directly below the first carrier frame (301); The first discharge pipe (302) is fixedly inserted into the outer wall of the first bearing frame (301) and is used for the circulation of pulverized coal and hot air. The first ring cover (303) is attached to the top of the first support frame (301) by a sealing strip. The first ring cover (303) is used for the maintenance and cleaning of the first support frame (301).

7. The pulverized coal centrifugal classifier according to claim 2, characterized in that, The third sorting mechanism (400) includes: The second support frame (401) is fixedly inserted into the bottom of the protective cylinder (101), and the middle part of the second support frame (401) is provided with an air separation mechanism (500). The second discharge pipe (402) is fixedly inserted into the outer wall of the second support frame (401); The second ring cover (403) is snapped onto the top of the second support frame (401) by a sealing strip.

8. The pulverized coal centrifugal classifier according to claim 7, characterized in that, The second carrier frame (401) includes: The frame (411) is fixedly connected to the bottom of the protective cylinder (101); Inner frame (412), the inner frame (412) is integrally formed with the frame body (411) and fixed to the inner ring of the frame body (411), the inner frame (412) is set at the bottom of the rotating head (201); First ball (413), a plurality of first ball (413) are rolled and embedded in the top of inner frame (412); Connecting ring (414), the connecting ring (414) is integrally formed with the outer wall of the inner frame (412) and fixed to the outer wall of the inner frame (412); A ring screen (415) is fixed to the outer wall of a connecting ring (414), and the outer wall of the ring screen (415) is fixedly connected to the inner wall of a protective cylinder (101).

9. The pulverized coal centrifugal classifier according to claim 8, characterized in that, The wind separation mechanism (500) includes: An air inlet pipe (501) is connected to a heat pump; The annular pipe (502) is fixed to the inner wall of the frame (411) by a fixing ring. One end of the air inlet pipe (501) is fixedly inserted and connected to the outer wall of the annular pipe (502). The air inlet pipe (501) communicates with the inner cavity of the annular pipe (502). Air outlet pipe (503), multiple air outlet pipes (503) are fixedly inserted into the inner wall of the frame (411) in a ring array, and one end of the air outlet pipe (503) is fixedly inserted into the outer wall of the ring pipe (502).

10. A control system for a pulverized coal centrifugal classifier, characterized in that, The invention includes a pulverized coal centrifugal classifier as described in any one of claims 1-9, and a controller electrically connected thereto, the controller being used to control the start and stop of the electrical equipment.

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