Coal fineness detection device

Abstract

The application discloses a kind of coal fines detection devices, including cabinet and integrated installation sampling mechanism, feeding mechanism, bellows, screening mechanism, weighing mechanism and transfer mechanism.The device can be automatically round patrolled sampling to multiple wind powder pipes by multiple sampling mechanisms and solenoid valve cooperation, realize centralized detection.Bellows adopts the structure of alternate body section and narrowing section, the narrowing section is connected by different inclination first slope and second slope, cooperates silicon carbide coating and thinning wall thickness design, while ensuring flexible anti-vibration performance, effectively avoid coal powder retention.Screening mechanism is screened by multiple layers of screening groove, weighing mechanism is accurately weighed after screening, and transfer mechanism realizes the automatic transfer of screening groove between each station.

Description

Technical Field

[0001] This invention relates to the detection of coal powder fineness, and particularly to a coal powder fineness detection device. Background Technology

[0002] For coal-fired power units, the fineness of the pulverized coal blown into the furnace has a significant impact on the economy and safety of combustion. Due to the current limitations of industry technology, online detection of pulverized coal fineness is quite difficult.

[0003] Currently, the detection of coal powder fineness mainly involves periodically extracting coal powder samples manually from the air-coal pipe at the coal mill outlet and sending the samples to a laboratory for fineness testing. This method is time-consuming, the test results are severely delayed, and it cannot reflect changes in coal powder fineness in real time. When there are multiple coal mill systems on site, it is necessary to sample and test the air-coal pipe of each coal mill, making centralized sampling and testing impossible. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a coal powder fineness detection device, which can detect the fineness of coal powder online and can sample and detect multiple air-coal pipes.

[0005] A coal powder fineness detection device according to a first aspect of the present invention includes a cabinet and a sampling mechanism, a feeding mechanism, a corrugated pipe, a screening mechanism, a weighing mechanism, and a transfer mechanism installed in the cabinet. Multiple sampling mechanisms are provided, each configured to draw a mixture of air and coal powder from a coal powder duct; the feeding mechanism is connected to the sampling mechanism via a solenoid valve, with each solenoid valve corresponding to one of the sampling mechanisms.

[0006] The upper end of the corrugated pipe is connected to the discharge port of the feeding mechanism. The screening mechanism includes multiple screening troughs stacked vertically. The screen hole diameter of the upper layer of screening trough is larger than that of the lower layer of screening trough. The uppermost screening trough is connected to the lower end of the corrugated pipe. The screening mechanism is used to screen coal powder. The weighing mechanism is used to weigh the screening trough. The transfer mechanism is configured to transfer the screening trough between the screening mechanism and the weighing mechanism. The screening trough includes a frame and a screen. The frame is cylindrical. The upper end of the frame is provided with a placement step. The lower end of the frame is provided with an insertion part. Magnetic blocks are provided on both the placement step and the insertion part. The screen is detachably embedded in the lower end of the frame. Adjacent frames are inserted into the corresponding placement step through the insertion part. The magnetic blocks are used to guide the insertion direction of the insertion part.

[0007] It has at least the following beneficial effects: The sampling mechanism, solenoid valve, and feeding mechanism can sample the air-powder pipe. When dealing with multiple air-powder pipes, multiple sampling mechanisms can sample the predetermined air-powder pipes under the control of the solenoid valve, realizing centralized sampling and testing of multiple air-powder pipes. This eliminates the trouble of manually sampling individual air-powder pipes and improves testing efficiency.

[0008] According to some embodiments of the present invention, the corrugated pipe is made of polyethylene, and the inner wall of the corrugated pipe is embedded with a metal mesh.

[0009] According to some embodiments of the present invention, the sampling mechanism includes a sampling tube and a separator. Multiple sampling tubes are provided, and the separator is provided in a one-to-one correspondence with the sampling tube. The sampling tube is configured to draw a mixture of air and coal powder into a coal powder pipe. The separator is connected to the sampling tube and is used to separate air and coal powder. The powder outlet of the separator is connected to the feeding mechanism through a solenoid valve.

[0010] According to some embodiments of the present invention, the screening mechanism includes a vibrator, a placement platform is provided on the vibrator for placing the screening trough, a support is provided on the placement platform, a pressure cap is slidably connected to the support along the vertical direction, the pressure cap is used to press down the uppermost screening trough, and the pressure cap is connected to the lower end of the corrugated pipe.

[0011] According to some embodiments of the present invention, two extension arms are provided on the screening tank. The extension arms are configured in an I-shape, and a rubber layer is provided on the cross plate of the extension arms. The extension arms are used to be clamped by the transfer mechanism.

[0012] According to some embodiments of the present invention, a transfer frame is also included, which is disposed in the cabinet and is used to support the screening tank.

[0013] According to some embodiments of the present invention, a cleaning device is also included, comprising a hopper, a cover, and a cleaning brush. The hopper is disposed within a cabinet with its opening facing upwards. The lower end of the hopper is connected to a coal dust pipe via a return pipe. A negative pressure adsorber is disposed on the return pipe to draw coal dust from the hopper into the coal dust pipe. The cover is vertically slidably disposed within the cabinet to close the upper opening of the hopper. The cleaning brush is rotatably disposed on the cover. The hopper is used to recover coal dust from the weighed screening trough, and the cleaning brush is used to clean coal dust adhering to the inner wall of the hopper.

[0014] According to some embodiments of the present invention, an air purification device is also included, which is disposed inside the cabinet and is used to adsorb coal dust floating inside the cabinet.

[0015] According to some embodiments of the present invention, the air purification device includes an adsorption tank filled with activated carbon particles.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the coal powder fineness detection device according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the bellows of the coal powder fineness detection device is shown. Figure 3 for Figure 2 A three-dimensional cross-sectional view of the bellows shown; Figure 4 for Figure 1 A schematic diagram of the screening mechanism of the coal powder fineness detection device is shown. Figure 5 for Figure 1 A schematic diagram of the cleaning device of the coal powder fineness detection device is shown. Figure 6 This is another structural diagram of the cleaning device; Figure 7 This is a schematic diagram of the screening tank and the extension arm; Figure 8 This is a schematic diagram of the screening tank.

[0018] Icon labels: Sampling mechanism 100, sampling tube 110, separator 120, transfer frame 130, air purification device 140; Feeding mechanism 200, solenoid valve 210; Corrugated pipe 300, body section 310, narrowing section 320, first inclined surface 330, second inclined surface 340; Screening mechanism 400, vibrator 410, placement platform 420, support 430, pressure cover 440, screening trough 450, extension arm 451; Frame 452, screen 453, placement step 452a, insertion part 452b, magnetic block 452c; Weighing mechanism 500, transfer mechanism 600; Cleaning device 700, hopper 710, cover 720, sweeping brush 730, return pipe 740, negative pressure adsorber 750, control valve 760, control box 770. Cabinet 800, air duct 900. Detailed Implementation

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 8 This invention discloses a coal powder fineness detection device, including a cabinet 800 and a sampling mechanism 100, a feeding mechanism 200, a corrugated pipe 300, a screening mechanism 400, a weighing mechanism 500, and a transfer mechanism 600 installed in the cabinet 800. Multiple sampling mechanisms 100 are provided, each configured to extract a mixture of air and coal powder from a coal powder duct 900; the feeding mechanism 200 is connected to the sampling mechanism 100 via a solenoid valve 210, with each solenoid valve 210 corresponding to one of the sampling mechanisms 100.

[0023] Reference Figure 2 and Figure 3 The upper end of the corrugated pipe 300 is connected to the outlet of the feeding mechanism 200. The corrugated pipe 300 includes multiple body sections 310 and multiple narrow sections 320. The body sections 310 and narrow sections 320 are alternately arranged. The diameter of the body section 310 is larger than the diameter of the narrow section 320. The upper end of the narrow section 320 is connected to the body section 310 through a first inclined surface 330. The lower end of the narrow section 320 is connected to another body section 310 through a second inclined surface 340. The angle between the first inclined surface 330 and the vertical plane is between 0° and 30°. The angle between the second inclined surface 340 and the vertical plane is between 45° and 90°. The inner side of the first inclined surface 330 and the inner side of the second inclined surface 340 are both provided with a silicon carbide coating. The wall thickness of the narrow section 320 is less than the thickness of the body section 310. Reference Figure 4 and Figure 8The screening mechanism 400 includes a plurality of vertically stacked screening troughs 450, wherein the screen aperture diameter of the upper screening trough 450 is larger than that of the screening trough 450 of the lower layer, and the uppermost screening trough 450 is connected to the lower end of the corrugated pipe 300. The screening mechanism 400 is used to screen coal powder. The weighing mechanism 500 is used to weigh the screening troughs 450. The transfer mechanism 600 is configured to transfer the screening troughs 450 between the screening mechanism 400 and the weighing mechanism 500. The screening tank 450 includes a frame 452 and a screen 453. The frame 452 is cylindrical, with a placement step 452a at the upper end and an insertion part 452b at the lower end. Magnetic blocks 452c are provided on both the placement step 452a and the insertion part 452b. The screen 453 is detachably embedded in the lower end of the frame 452. Adjacent frames 452 are inserted into their corresponding placement steps 452a via the insertion parts 452b. The magnetic blocks 452c guide the insertion direction of the insertion parts 452b. It is understood that several magnetic blocks 452c are distributed in a ring around the placement step 452a or the insertion part 452b. Alternatively, the magnetic blocks 452c can be directly arranged in a ring. The magnetic poles of the magnetic blocks 452c in the placement step 452a and the insertion part 452b are opposite. This ensures that the magnetic blocks 452c in the placement step 452a and the insertion part 452b can attract each other, thereby guiding the adjacent screening tanks 450 during installation. The installation guidance of the screening tanks 450 is to ensure that the screening tanks 450 can be accurately installed in place.

[0024] It should be understood that the sampling mechanism 100, solenoid valve 210 and feeding mechanism 200 can sample the air-powder pipe 900. When dealing with multiple air-powder pipes 900, multiple sampling mechanisms 100 can sample the predetermined air-powder pipes 900 under the control of solenoid valve 210, realizing centralized sampling and testing of multiple air-powder pipes 900, eliminating the trouble of manually sampling individual air-powder pipes 900 in the past.

[0025] It should be noted that the corrugated pipe 300 has a main body section 310 and a narrowing section 320, which are alternately arranged. The narrowing section 320 is connected to the main body section 310 by an inclined surface. The narrowing section 320 itself has a certain length, which provides a buffer length between the first inclined surface 330 and the second inclined surface 340, avoiding the retention of coal dust in the gap between the two inclined surfaces of a traditional corrugated pipe. Furthermore, the inclination angles of the first inclined surface 330 and the second inclined surface 340 are different, because the first inclined surface 330 is on top, making the first inclined surface 330 as gentle as possible to reduce the retention of coal dust. The second inclined plane 340 is located at the bottom, making it more inclined downwards. This makes the inclined component of the coal powder's gravity greater than the force perpendicular to the inclined plane, allowing the coal powder to fall easily. The corrugated pipe with this design can also maintain a certain degree of flexibility under the screening action of the screening mechanism 400. Compared with straight cylindrical conveying pipes, it is more resistant to vibration. Compared with traditional corrugated pipes, it can reduce coal powder retention. The silicon carbide coating further reduces coal powder adhesion, and the thinned narrow section 320 can concentrate stress in the narrow section 320, improving the overall flexibility of the corrugated pipe 300 and thus resisting vibration.

[0026] It should be noted that the corrugated pipe 300 is used for material feeding, and a detector is installed inside the corrugated pipe 300. This detector is used to detect the amount of material fed. Since the screening mechanism 400 cannot weigh, the detector is used to detect the height of the pile of fallen coal powder. The detector is a general distance sensor or contact sensor. When the height of the pile of fallen coal powder reaches the predetermined position, the sensor is triggered. At this time, the feeding mechanism 200 will no longer convey material forward.

[0027] It is understandable that pulverized coal is prone to condensation during transport. Therefore, a heating device is installed on the separator 120. Specifically, an electric heating wire is wound around the outer shell of the separator to heat the separator, thereby evaporating the moisture in the pulverized coal into water vapor. The water vapor can be separated out by the cyclone separator, or an adsorbent can be installed on the feeding mechanism 200 to absorb the water vapor and prevent pulverized coal condensation. In short, the water vapor needs to be removed before the pulverized coal enters the screen. The feeding mechanism 200 mainly includes a feeding cylinder and a vibrator. The vibrator is connected to the feeding cylinder and vibrates the feeding cylinder to transport the pulverized coal out of the feeding cylinder. An adsorbent module is installed at the top of the feeding cylinder. The adsorbent module can be a water-permeable bag filled with water-absorbing agent. The adsorbent module is placed at the top of the feeding cylinder to prevent interference with the forward movement of the pulverized coal and to absorb the water vapor as it evaporates upward.

[0028] It is understandable that separator 120 is a cyclone separator.

[0029] In some embodiments, metal wires may be embedded in the wall of the bellows 300 to enhance its strength. The solenoid valve 210 is a conventional solenoid valve, which needs to be connected to a computer host or other controller via a signal cable for use. These are all conventional settings. The so-called feeding mechanism 200 can be a cylinder push plate mechanism, a screw conveyor mechanism, or a vibrating conveyor mechanism. It is understood that the bellows 300 is made of polyethylene, and the inner wall of the bellows 300 is embedded with metal mesh.

[0030] In some embodiments, the sampling mechanism 100 includes a sampling tube 110 and a separator 120. Multiple sampling tubes 110 are provided, and the separator 120 is provided in a one-to-one correspondence with the sampling tubes 110. The sampling tube 110 is configured to extract a mixture of air and coal powder to a coal pulverizer 900. The separator 120 is connected to the sampling tube 110 and is used to separate air and coal powder. The powder outlet of the separator 120 is connected to the feeding mechanism 200 through a solenoid valve 210.

[0031] In some embodiments, the screening mechanism 400 includes a vibrator 410, a placement platform 420 is provided on the vibrator 410, the placement platform 420 is used to place the screening trough 450, a support 430 is provided on the placement platform 420, a pressure cap 440 is slidably connected to the support 430 along the vertical direction, the pressure cap 440 is used to press down the uppermost screening trough 450, and the pressure cap 440 is connected to the lower end of the corrugated pipe 300. It is understandable that the vibrator 410 is a common type of vibrator. The vibrator 410 also has a weighing function. That is, the placement platform 420 of the vibrator 410 is connected to the main body of the vibrator 410 through a gravity sensor. This is so that the vibrator 410 will only vibrate when there is a predetermined weight of coal powder in the screening trough 450. This prevents the vibrator 410 from vibrating continuously and causing the entire screening mechanism 400 to loosen, which would result in gaps between the screening troughs 450 and coal powder escaping from the gaps. It is understandable that the automatic vibration of the vibrator 410 is controlled by a controller, which may include a computer, PLC or microcomputer, etc. The specific electrical connection method is conventional.

[0032] In some embodiments, the screening trough 450 is provided with two extension arms 451, which are I-shaped. A rubber layer is provided on the cross plate of each extension arm 451. The extension arms 451 are used to be clamped by the transfer mechanism 600. A transfer frame 130 is also included, which is disposed in the cabinet 800 and is used to support the screening trough 450. It can be understood that the transfer mechanism 600 is a robotic arm, and the front end of the robotic arm is provided with pneumatic fingers. Two pneumatic fingers are also provided, corresponding to the two extension arms 451. The rubber layer prevents slippage during clamping.

[0033] In some embodiments, a cleaning device 700 is also included, which includes a hopper 710, a cover 720, and a cleaning brush 730. The hopper 710 is disposed inside the cabinet 800 with its opening facing upwards. The lower end of the hopper 710 is connected to the air-powder pipe 900 through a return pipe 740. A negative pressure adsorber 750 is disposed on the return pipe 740. The negative pressure adsorber 750 is used to draw coal powder from the hopper 710 into the air-powder pipe 900. The cover 720 is slidably disposed vertically inside the cabinet 800 and is used to close the upper opening of the hopper 710. The cleaning brush 730 is rotatably disposed on the cover 720. The hopper 710 is used to recover the coal powder in the screening tank 450 after weighing, and the cleaning brush 730 is used to clean the coal powder adhering to the inner wall of the hopper 710.

[0034] In some implementations, refer to Figure 6 The connecting part of the cleaning brush 730 can be equipped with a U-shaped arm, with cleaning brushes at both ends of the U-shaped arm. When the robotic arm clamps the screening trough 450 and extends into the space where the collection hopper 710 is located, the screening trough 450 is horizontally inserted into the U-shaped opening of the U-shaped arm. At this time, the cleaning brushes 730 at both ends of the U-shaped arm can clean the upper and lower ends of the screening trough 450 simultaneously, ensuring the cleaning efficiency and cleaning effect of the screening trough 450.

[0035] Understandably, the cleaning device 700 also includes an operation box 770. The collection hopper 710, cover 720, and cleaning brush 730 are all located in the operation box 770. A branch pipe is provided on the return pipe 740. Each branch pipe is connected to the corresponding air-powder pipe 900 through a control valve 760. One control valve 760 is opened while the others are closed, thus ensuring that the returned coal powder is returned to the preset air-powder pipe 900. The operation box 770 can serve as the destination for the transfer mechanism 600 to transfer the screening tank 450, and it can also isolate the coal powder poured into the screening tank 450 to prevent the coal powder from floating and spreading everywhere.

[0036] In some embodiments, a camera is also installed inside the cabinet 800. The camera is used to capture the position of the robotic arm inside the cabinet 800. When unattended, the position of the robotic arm inside the cabinet 800 can be observed remotely via video, so as to remotely control the robotic arm. The power sources of the movable parts inside the cabinet 800 are all electrically connected to the central control device. The operator can adjust the movable parts inside the cabinet 800 through the central control device. The so-called movable parts include the robotic arm, vibrator, motor of the cleaning device, and lifting cylinder, etc. The central control device includes a computer, PLC or server, etc. The configuration and electrical connection of these can be done according to the conventional operation of those skilled in the art.

[0037] In some embodiments, an air purification device 140 is also included. The air purification device 140 is disposed inside the cabinet 800 and is used to adsorb coal dust floating inside the cabinet 800. The air purification device 140 includes an adsorption tank filled with activated carbon particles. It should be noted that the adsorption tank is connected to a negative pressure fan. The negative pressure fan draws air from inside the cabinet 800 into the adsorption tank, and the activated carbon particles filled in the adsorption tank adsorb the coal dust. The activated carbon particles in the adsorption tank can be replaced with other adsorption materials, such as water or sponge.

[0038] A method for detecting the fineness of pulverized coal, employing a pulverized coal fineness detection device according to the first aspect embodiment of the present invention, includes the following steps: S1, the screening tanks 450 are stacked in the cabinet 800, one of the solenoid valves 210 is opened and the other solenoid valves 210 are closed, so that the coal powder in the corresponding sampling mechanism 100 is sent to the feeding mechanism 200. S2, after a predetermined weight of coal powder has accumulated in the feeding mechanism 200, the feeding mechanism 200 is opened to send the coal powder through the corrugated pipe 300 to the screening tank 450. S3, the screening mechanism 400 drives the screening trough 450 to vibrate and screen, separating and retaining coal powder of different particle sizes in the corresponding screening trough 450, and stopping after the predetermined screening time; S4, the upper screening tank 450 is transferred to the weighing mechanism 500 using the transfer mechanism 600 for weighing and calculating the fineness of the coal powder. After weighing, the screening tank 450 is clamped to the collection hopper 710 to pour out the coal powder. The collection hopper 710 collects the coal powder and returns it to the air-powder pipe 900. S5, using the transfer mechanism 600 to transfer the screen 450 after the coal powder has been poured out to the transfer frame 130, until the last screen 450 is transferred to the transfer frame 130; S6, using the transfer mechanism 600 to clamp the screening tank 450 on the transfer frame 130 from top to bottom and put it back into the cabinet 800 in sequence; S7, multiple solenoid valves 210 are opened in a predetermined sequence, with one solenoid valve 210 opened each time and the other solenoid valves 210 closed, and then steps S2 to S6 are executed.

[0039] It should be noted that in step S1, the screening tank 450 is initially stacked on the placement platform 420. In order to achieve multi-point inspection, the solenoid valve 210 is opened only once at a time, so that the coal powder in one air-powder pipe 900 is sampled and weighed. The coal powder accumulated in the feeding mechanism 200 of the predetermined weight can be sensed by setting a gravity sensor on the feeding mechanism 200. The approximate weight of the coal powder can also be calculated based on the opening time of the solenoid valve 210. It can be understood that the gravity sensor is set at the lower end of the feeding mechanism 200, that is, the feeding mechanism 200 is connected to the gravity sensor. When coal powder enters the feeding mechanism 200, the gravity sensor can sense the weight change, thereby controlling the start of the feeding mechanism 200 through the controller.

[0040] Understandably, in step S4, after the transfer mechanism 600 transfers the upper screening trough 450, the remaining stacked screening troughs 450 reappear as the upper screening trough 450. This process of transferring and weighing from top to bottom continues until the bottommost screening trough 450 of the stacked screening troughs 450 is weighed. After weighing, the weight ratio of the coal powder of each fineness after screening is calculated to obtain the overall fineness of the coal powder in this air-powder pipe 900.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A pulverized coal fineness detection device characterized by comprising: Includes the cabinet (800) and the components installed in the cabinet (800): Sampling mechanisms (100) are provided in multiples, each of which is configured to extract a mixture of air and coal powder into a coal pulverizer (900); The feeding mechanism (200) is connected to the sampling mechanism (100) through a solenoid valve (210), and the solenoid valve (210) and the sampling mechanism (100) are respectively configured to correspond one-to-one; A corrugated pipe (300) is connected at its upper end to the discharge port of the feeding mechanism (200); The screening mechanism (400) includes a plurality of vertically stacked screening troughs (450). The screen aperture diameter of the upper layer of the screening trough (450) is larger than that of the screening trough (450) of the lower layer. The uppermost screening trough (450) is connected to the lower end of the corrugated pipe (300). The screening mechanism (400) is used to screen coal powder. The screening trough (450) includes a frame (452) and a screen (453). The frame (452) is cylindrical. The upper end of the frame (452) is provided with... The frame (452) has a placement step (452a) and a plug-in part (452b) at the lower end. Both the placement step (452a) and the plug-in part (452b) are provided with magnetic blocks (452c). The lower end of the frame (452) is detachably embedded with a screen (453). Adjacent frames (452) are inserted into the corresponding placement step (452a) through the plug-in part (452b). The magnetic blocks (452c) are used to guide the insertion direction of the plug-in part (452b). Weighing mechanism (500) is used to weigh the screening tank (450); The transfer mechanism (600) is configured to transfer the screening tank (450) between the screening mechanism (400) and the weighing mechanism (500).

2. The pulverized coal fineness detection device according to claim 1, characterized by The corrugated pipe (300) is made of polyethylene, and the inner wall of the corrugated pipe (300) is embedded with a metal mesh.

3. The pulverized coal fineness detection device according to claim 1, characterized by The sampling mechanism (100) includes a sampling tube (110) and a separator (120). Multiple sampling tubes (110) are provided. The separator (120) is provided in a one-to-one correspondence with the sampling tubes (110). The sampling tube (110) is configured to extract a mixture of air and coal powder from a coal pulverizer pipe (900). The separator (120) is connected to the sampling tube (110) and is used to separate air and coal powder. The powder outlet of the separator (120) is connected to the feeding mechanism (200) through a solenoid valve (210).

4. The pulverized coal fineness detection device according to claim 1, characterized by The screening mechanism (400) includes a vibrator (410), on which a placement platform (420) is provided. The placement platform (420) is used to place the screening trough (450). A bracket (430) is provided on the placement platform (420). A pressure cap (440) is slidably connected to the bracket (430) along the vertical direction. The pressure cap (440) is used to press down the uppermost screening trough (450). The pressure cap (440) is connected to the lower end of the corrugated pipe (300).

5. The pulverized coal fineness detection device according to claim 4, characterized by The screening trough (450) is provided with two extension arms (451), the extension arms (451) are configured as I-shaped, the horizontal plate of the extension arms (451) is provided with a rubber layer, and the extension arms (451) are used to be clamped by the transfer mechanism (600).

6. The coal powder fineness detection device according to any one of claims 1 to 5, characterized in that, It also includes a transfer frame (130), which is disposed in the cabinet (800) and is used to support the screening tank (450).

7. The coal powder fineness detection device according to claim 6, characterized in that, It also includes a cleaning device (700), which includes a collection hopper (710), a cover (720), and a cleaning brush (730). The collection hopper (710) is located inside the cabinet (800), with its opening facing upwards. The lower end of the collection hopper (710) is connected to the air-coal pipe (900) via a return pipe (740). A negative pressure adsorber (750) is installed on the return pipe (740), and the negative pressure adsorber (750) is used to remove coal. The coal powder is drawn from the collection hopper (710) into the air-powder pipe (900). The cover (720) is slidably disposed vertically inside the cabinet (800). The cover (720) is used to close the upper opening of the collection hopper (710). The cleaning brush (730) is rotatably disposed on the cover (720). The collection hopper (710) is used to recover the coal powder in the screening tank (450) after weighing. The cleaning brush (730) is used to clean the coal powder adhering to the inner wall of the collection hopper (710).

8. The pulverized coal fineness detection device according to claim 7, characterized by It also includes an air purification device (140), which is installed inside the cabinet (800) and is used to adsorb coal dust floating inside the cabinet (800).

9. The pulverized coal fineness detection device according to claim 8, characterized by The air purification device (140) includes an adsorption tank filled with activated carbon particles.

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