Multi-point wheeling coal powder fineness detection device and coal powder fineness detection method

Abstract

The application discloses a multi-point wheel patrol coal powder fineness detection device and a detection method using the same. The multi-point wheel patrol coal powder fineness detection device comprises a cabinet body and integrated sampling mechanisms, feeding mechanisms, corrugated pipes, screening mechanisms, weighing mechanisms and transfer mechanisms. The device can automatically patrol and sample multiple wind powder pipes through the cooperation of multiple sampling mechanisms and electromagnetic valves, thereby realizing centralized detection. The corrugated pipe adopts an alternating structure of body sections and narrowed sections, the narrowed sections are connected through first inclined surfaces and second inclined surfaces with different angles, and are matched with a silicon carbide coating and a thin-wall thickness design, so that the coal powder is effectively prevented from being retained while the flexible and anti-vibration performance is ensured. The screening mechanism screens the coal powder through multiple screening grooves, the weighing mechanism accurately weighs the screened coal powder, and the transfer mechanism automatically transfers the screening grooves between stations.

Description

Technical Field

[0001] The present invention relates to the technical field of coal powder fineness detection devices, and in particular to a multi-point patrol coal powder fineness detection device and a coal powder fineness detection method. Background Art

[0002] For thermal power units burning pulverized coal, the fineness of the pulverized coal blown into the furnace has a great impact on the economy and safety of combustion. Due to the limitations of the current level of technological development in the industry, online detection of pulverized coal fineness is relatively difficult.

[0003] Currently, coal fineness testing primarily involves periodically manually extracting coal samples from the air-powder pipe at the pulverizer outlet and sending them to a laboratory for fineness testing. This method is time-consuming, results are severely delayed, and it fails to reflect real-time changes in coal fineness. In multi-pulverizer systems, sampling and testing is required from the air-powder pipe of each pulverizer, making centralized sampling and testing impossible. Automated coal fineness testing devices, however, use traditional bellows to feed coal from the feed mechanism to the screening mechanism, which can trap coal, leading to inaccurate coal fineness measurement. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a multi-point patrol coal fineness detection device that can detect coal fineness online and perform sampling tests on multiple air-powder pipes, thereby reducing coal retention during the detection process and improving detection accuracy.

[0005] The invention also provides a method for detecting the fineness of coal powder.

[0006] According to a first embodiment of the present invention, a multi-point patrol coal fineness detection device includes a cabinet and a sampling mechanism, a feeding mechanism, a bellows, a screening mechanism, a weighing mechanism, and a transfer mechanism mounted thereon. Multiple sampling mechanisms are provided, each configured to extract a mixture of air and coal powder from an air-powder pipe. The feeding mechanism is connected to the multiple sampling mechanisms via multiple solenoid valves, each corresponding to one of the multiple sampling mechanisms.

[0007] The upper end of the bellows is connected to the discharge port of the feeding mechanism. The bellows includes multiple main body sections and multiple narrowing sections, which are alternately arranged. The diameter of the main body section is larger than the diameter of the narrowing section. The upper end of the narrowing section is connected to the main body section via a first inclined surface, and the lower end of the narrowing section is connected to another main body section via a second inclined surface. The angle between the first inclined surface and the vertical surface is between 0° and 30°, and the angle between the second inclined surface and the vertical surface is between 45° and 90°. The inner side of the first inclined surface and the inner side of the second inclined surface are both provided with a silicon carbide coating, and the wall thickness of the narrowing section is smaller than the wall thickness of the main body section.

[0008] The screening mechanism includes a plurality of vertically stacked screening slots, the screen hole diameter of the upper layer of screening slots is larger than the screen hole diameter of the lower layer of screening slots, the uppermost layer of screening slots is connected to the lower end of the corrugated pipe, and the screening mechanism is used to screen coal powder; the weighing mechanism is used to weigh the screening slots; the transfer mechanism is configured to transfer the screening slots between the screening mechanism and the weighing mechanism.

[0009] It has at least the following beneficial effects:

[0010] The provided sampling mechanism, electromagnetic valve and feeding mechanism can sample the air powder tube. When dealing with multiple air powder tubes, multiple sampling mechanisms can sample the predetermined air powder tube under the control of the electromagnetic valve, thereby realizing centralized sampling and detection of multiple air powder tubes, eliminating the trouble of manual sampling of individual air powder tubes in the past; the provided bellows has a main body section and a narrowing section, and the main body section and the narrowing section are alternately arranged, and the narrowing section is connected to the main body section through an inclined surface, and the narrowing section itself has a certain length, which makes a buffer length between the first inclined surface and the second inclined surface, avoiding the retention of coal powder in the gap between the two inclined surfaces of the traditional bellows, and the inclination angles of the first inclined surface and the second inclined surface are not The first slope is at the top, so the first slope is as gentle as possible to reduce the retention of coal powder on the first slope, and the second slope is at the bottom, so the second slope is tilted downward more, so that the inclined component of the coal powder's gravity is greater than the force perpendicular to the slope, so that the coal powder can fall easily. Such a bellows can also maintain a certain flexibility under the screening action of the screening mechanism. Compared with the straight-cylinder conveying pipeline, it can better resist vibration and reduce coal powder retention compared with the traditional bellows. The silicon carbide coating further reduces the adhesion of coal powder, and the thinned narrowing section can concentrate the stress in the narrowing section, so that the flexibility of the entire bellows is improved, thereby resisting vibration.

[0011] According to some embodiments of the present invention, the bellows is made of polyethylene, and a metal mesh is embedded in the inner wall of the bellows.

[0012] According to some embodiments of the present invention, the sampling mechanism includes a sampling tube and a separator. A plurality of sampling tubes are provided. The separators are arranged in one-to-one correspondence with the sampling tubes. The sampling tube is configured to extract a mixture of air and pulverized coal from an air-powder tube. The separator is connected to the sampling tube. The separator is used to separate air and pulverized coal. The powder outlet of the separator is connected to the feeding mechanism through an electromagnetic valve.

[0013] According to some embodiments of the present invention, the screening mechanism includes a vibrator, a placing platform is provided on the vibrator, the placing platform is used to place the screening trough, a bracket is provided on the placing platform, a pressure cover is vertically slidably connected to the bracket, the pressure cover is used to press the uppermost screening trough, and the pressure cover is connected to the lower end of the bellows.

[0014] According to some embodiments of the present invention, two extension arms are provided on the screening trough, and the extension arms are arranged in an I-shape. The I-shaped extension arm consists of two vertical plates and a horizontal plate. A rubber layer is provided on the horizontal plate, and the transfer mechanism contacts the rubber layer when clamping the extension arm.

[0015] According to some embodiments of the present invention, a transfer rack is further included. The transfer rack is disposed in the cabinet and is used to carry the screening trough.

[0016] According to some embodiments of the present invention, a cleaning device is also included, which includes a collecting hopper, a covering and a cleaning brush. The collecting hopper is arranged in a cabinet, and the opening of the collecting hopper is arranged upward. The lower end of the collecting hopper is connected to the air-powder pipe through a return pipe. A negative pressure adsorber is provided on the return pipe. The negative pressure adsorber is used to suck the coal powder from the collecting hopper into the air-powder pipe. The covering is arranged in the cabinet along a vertical sliding direction. The covering is used to close the upper end opening of the collecting hopper. The cleaning brush is rotatably arranged on the covering. The collecting hopper is used to recover the coal powder in the screening trough after weighing. The cleaning brush is used to clean the coal powder attached to the inner wall of the collecting hopper.

[0017] According to some embodiments of the present invention, an air purification device is further included. The air purification device is disposed in the cabinet and is used to absorb coal powder floating in the cabinet.

[0018] According to some embodiments of the present invention, an air purification device includes an adsorption tank filled with activated carbon particles.

[0019] A method for detecting coal fineness according to a second embodiment of the present invention, which employs a multi-point patrol coal fineness detection device according to the first embodiment of the present invention, includes the following steps:

[0020] S1, stacking the screening troughs in the cabinet;

[0021] S2: Open one of the solenoid valves while keeping the other solenoid valves closed. The pulverized coal in the sampling mechanism corresponding to the opened solenoid valve is fed to the feeding mechanism. When a predetermined weight of pulverized coal is accumulated in the feeding mechanism, the opened solenoid valve is closed and the feeding mechanism is opened to feed the pulverized coal into the screening tank through the bellows.

[0022] S3, the screening mechanism drives the screening trough to vibrate and screen, isolating the coal powder of different particle sizes and retaining them in the corresponding screening troughs, and stops screening after a predetermined time;

[0023] S4, using a transfer mechanism to transfer the topmost screening trough to a weighing mechanism for weighing and calculating the fineness of the pulverized coal. After weighing, the screening trough is clamped to a collecting hopper and the pulverized coal is dumped. The collecting hopper collects the pulverized coal and returns it to the air-powder pipe;

[0024] S5, using the transfer mechanism to transfer the screening troughs after the coal powder has been dumped to the intermediate transfer rack for placement, until the last screening trough is transferred to the intermediate transfer rack;

[0025] S6, using the transfer mechanism to clamp the screening slots on the transfer rack from top to bottom and put them back into the cabinet in sequence;

[0026] S7, repeat steps S2 to S6.

[0027] At least the following beneficial effects are achieved: the present coal powder fineness detection method has all the beneficial effects brought about by the above-mentioned multi-point patrol coal powder fineness detection device, which will not be described again here.

[0028] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 This is a schematic structural diagram of a multi-point patrol coal powder fineness detection device according to an embodiment of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the bellows of the multi-point patrol coal powder fineness detection device;

[0032] Figure 3 for Figure 2 A perspective cutaway view of the bellows is shown;

[0033] Figure 4 for Figure 1 The structural diagram of the screening mechanism of the multi-point patrol coal powder fineness detection device is shown;

[0034] Figure 5 for Figure 1 The schematic diagram of the structure of the cleaning device of the multi-point patrol coal powder fineness detection device is shown;

[0035] Figure 6 is another structural schematic diagram of the cleaning device;

[0036] Figure 7 Schematic diagram of the screening trough and extension arm.

[0037] Figure Number:

[0038] Sampling mechanism 100, sampling tube 110, separator 120, transfer rack 130, air purification device 140;

[0039] Feeding mechanism 200, solenoid valve 210;

[0040] Bellows 300, main body section 310, narrowed section 320, first inclined surface 330, second inclined surface 340;

[0041] Screening mechanism 400, vibrator 410, placement table 420, bracket 430, pressure cover 440, screening tank 450, extension arm 451;

[0042] Weighing mechanism 500, transfer mechanism 600;

[0043] Cleaning device 700, collecting hopper 710, sealing cover 720, cleaning brush 730, return pipe 740, negative pressure adsorber 750, control valve 760, operation box 770;

[0044] Cabinet 800, air powder hose 900. DETAILED DESCRIPTION

[0045] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention 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. Therefore, they cannot be understood as limitations on the present invention.

[0046] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0047] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0048] Reference Figures 1 to 7 The present invention discloses a multi-point patrol coal fineness detection device, comprising a cabinet 800 and a sampling mechanism 100, a feeding mechanism 200, a bellows 300, a screening mechanism 400, a weighing mechanism 500, and a transfer mechanism 600 mounted therein. Multiple sampling mechanisms 100 are provided, each configured to extract a mixture of air and coal powder from an air-powder pipe 900. The feeding mechanism 200 is connected to the sampling mechanism 100 via a solenoid valve 210, which is provided in a one-to-one correspondence with each sampling mechanism 100.

[0049] Reference Figure 2 and Figure 3The upper end of the bellows 300 is connected to the discharge port of the feeding mechanism 200. The bellows 300 includes a plurality of main body sections 310 and a plurality of narrowing sections 320. The main body sections 310 and the narrowing sections 320 are alternately arranged. The diameter of the main body section 310 is larger than the diameter of the narrowing section 320. The upper end of the narrowing section 320 is connected to the main body section 310 through a first inclined surface 330, and the lower end of the narrowing section 320 is connected to another main 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°, and 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 narrowing section 320 is smaller than the wall thickness of the main body section 310.

[0050] Reference Figure 4 The screening mechanism 400 includes a plurality of vertically stacked screening slots 450, the sieve hole diameter of the upper layer of screening slots 450 is larger than the sieve hole diameter of the lower layer of screening slots 450, and the uppermost layer of screening slots 450 is connected to the lower end of the bellows 300. The screening mechanism 400 is used to screen coal powder; the weighing mechanism 500 is used to weigh the screening slots 450; the transfer mechanism 600 is configured to transfer the screening slots 450 between the screening mechanism 400 and the weighing mechanism 500.

[0051] It should be understood that the sampling mechanism 100, solenoid valve 210 and feeding mechanism 200 are capable of sampling the air powder tube 900. When dealing with multiple air powder tubes 900, multiple sampling mechanisms 100 can sample the predetermined air powder tube 900 under the control of the solenoid valve 210, thereby realizing centralized sampling and detection of multiple air powder tubes 900, eliminating the trouble of manually sampling a single air powder tube 900.

[0052] It should be noted that the bellows 300 has a main body section 310 and a narrowing section 320, and the main body section 310 and the narrowing section 320 are alternately arranged, and the narrowing section 320 is connected to the main body section 310 through an inclined surface, and the narrowing section 320 itself has a certain length, which makes a buffer length between the first inclined surface 330 and the second inclined surface 340, avoiding the coal powder being trapped in the gap between the two inclined surfaces of the traditional bellows, and the inclination angles of the first inclined surface 330 and the second inclined surface 340 are different, because the first inclined surface 330 is at the top, so that the first inclined surface 330 is as gentle as possible, so that the first inclined surface 330 reduces the retention of coal powder. The second inclined surface 340 is located at the bottom, so that the second inclined surface 340 is tilted downward more, and the inclined component of the coal powder's gravity is greater than the force perpendicular to the inclined surface, so that the coal powder can fall easily. Such a bellows can also maintain a certain flexibility under the screening action of the screening mechanism 400. It is more resistant to vibration than a straight-cylinder conveying pipeline, and can reduce coal powder retention compared to traditional bellows. The silicon carbide coating further reduces the adhesion of coal powder, and the thinned narrowing section 320 can concentrate the stress on the narrowing section 320, thereby improving the flexibility of the entire bellows 300 and resisting vibration.

[0053] It should be noted that the bellows 300 is used for dropping materials, and a detector is provided inside the bellows 300. The detector is used to detect the amount of dropped materials. Since the screening mechanism 400 cannot be weighed, a detector is used to detect the height of the dropped coal powder. The detector is a general distance sensor or a contact sensor. When the height of the dropped coal powder reaches a predetermined position, the sensor is triggered. At this time, the feeding mechanism 200 no longer transports the material forward.

[0054] As can be understood, pulverized coal is prone to condensation during transportation. Therefore, a heating device is provided on the separator 120. Specifically, an electric heating wire is wrapped around the separator's outer shell. The electric heating wire heats the separator, evaporating the moisture in the pulverized coal into water vapor, which can be separated by the separator 120. Alternatively, an adsorbent can be provided on the feed mechanism 200 to absorb water vapor and prevent condensation of the pulverized coal. In short, the water vapor needs to be removed before the pulverized coal enters the screen. The so-called feed mechanism 200 mainly includes a feed barrel and a vibrator. The vibrator is connected to the feed barrel and vibrates the feed barrel to transport the pulverized coal out of the feed barrel. An adsorbent module is provided on the top of the feed barrel. The adsorbent module can be a permeable bag loaded with a water absorbent. The adsorbent module is placed on the top of the feed barrel to prevent interference with the forward movement of the pulverized coal and to absorb water vapor during its upward evaporation. As can be understood, the adsorbent module is removable. Depending on the frequency of on-site inspections, the adsorbent module will not need to be replaced very frequently, approximately every two weeks.

[0055] In some embodiments, metal wire can be embedded in the wall of the bellows 300 to enhance its strength. The solenoid valve 210 is a conventional solenoid valve and needs to be connected to a computer host or other controller through a signal cable for use. This is a conventional setting. The so-called feeding mechanism 200 can be a cylinder push plate mechanism, a screw conveying mechanism, or a vibration conveying mechanism. It can be understood that the bellows 300 is made of polyethylene, and the inner wall of the bellows 300 is embedded with a metal mesh.

[0056] In some embodiments, the sampling mechanism 100 includes a sampling tube 110 and a separator 120. There are multiple sampling tubes 110, and the separator 120 is arranged in a one-to-one correspondence with the sampling tube 110. The sampling tube 110 is configured to extract a mixture of air and coal powder from an air-powder tube 900. The separator 120 is connected to the sampling tube 110. The separator 120 is used to separate air and coal powder. The powder outlet of the separator 120 is connected to the feeding mechanism 200 through the solenoid valve 210. It can be understood that the separator 120 is a cyclone separation cylinder.

[0057] In some embodiments, the screening mechanism 400 includes an exciter 410, a placing platform 420 is provided on the exciter 410, the placing platform 420 is used to place the screening trough 450, a bracket 430 is provided on the placing platform 420, and a pressure cover 440 is vertically slidably connected to the bracket 430, the pressure cover 440 is used to press the uppermost screening trough 450, and the pressure cover 440 is connected to the lower end of the bellows 300. It can be understood that the vibrator 410 is a common vibrator, and the vibrator 410 also has a weighing function, that is, the placement table 420 of the vibrator 410 is connected to the main part of the vibrator 410 through a gravity sensor. This is to prevent the vibrator 410 from vibrating only when there is a predetermined weight of coal powder in the screening slot 450, so as to avoid the vibrator 410 from vibrating continuously and causing the entire screening mechanism 400 to loosen, thereby causing gaps to appear between the screening slots 450 and the coal powder to escape from the gaps. It can be understood that the automatic vibration of the vibrator 410 is controlled by a controller. The so-called controller includes a computer, PLC or microcomputer, etc., and the specific electrical connection method is a conventional method.

[0058] Reference Figure 1 、 Figure 4 and Figure 6The screening trough 450 is provided with two extension arms 451, each of which is in an I-shape. A rubber layer is provided on the horizontal plate of the extension arm 451, and the extension arm 451 is used to be clamped by the transfer mechanism 600. The transfer rack 130 is also included and is provided in the cabinet 800. The transfer rack 130 is used to support the screening trough 450. It can be understood that the transfer mechanism 600 is a robotic arm, and a pneumatic finger is provided at the front end of the robotic arm. There are also two pneumatic fingers, corresponding to the two extension arms 451. The rubber layer is provided to prevent slipping during clamping. It can be understood that the I-shaped extension arm 451 has an I-shaped cross-section, and the extension arm 451 is cut off with a surface perpendicular to the length direction of the extension arm 451. The cross-sectional surface of the extension arm 451 is I-shaped, and the cross plate is the horizontal plate in the middle of the I-shape, that is, the cross plate between the two vertical plates of the I-shape. The rubber layer is provided on the cross plate to facilitate clamping by the robotic arm, and the I-shaped extension arm 451 makes it easy for the robotic arm to find the correct position when clamping. The so-called robotic arm is a conventional robotic arm, and a clamping claw is provided at its execution end, and the clamping claw is used to clamp the extension arm 451. Two extension arms 451 are provided on the screening trough 450. The extension arms 451 are arranged in an I-shape. The I-shaped extension arms 451 are composed of two vertical plates and a horizontal plate. A rubber layer (not shown in the figure) is provided on the horizontal plate. When the transfer mechanism clamps the extension arm, it contacts the rubber layer.

[0059] In some embodiments, a cleaning device 700 is also included. The cleaning device 700 includes a collecting hopper 710, a cover 720 and a cleaning brush 730. The collecting hopper 710 is arranged in the cabinet 800, and the opening of the collecting hopper 710 is arranged upward. The lower end of the collecting hopper 710 is connected to the air-powder tube 900 through a return pipe 740. A negative pressure adsorber 750 is provided on the return pipe 740. The negative pressure adsorber 750 is used to suck the coal powder from the collecting hopper 710 into the air-powder tube 900. The cover 720 is vertically slidably arranged in the cabinet 800. The cover 720 is used to close the upper end opening of the collecting hopper 710. The cleaning brush 730 is rotatably arranged on the cover 720. The collecting hopper 710 is used to recover the coal powder in the screening trough 450 after weighing. The cleaning brush 730 is used to clean the coal powder attached to the inner wall of the collecting hopper 710.

[0060] In some implementations, reference Figure 6A U-shaped arm can be provided at the connecting part of the cleaning brush 730, and cleaning brushes are provided at both ends of the U-shaped arm. When the robotic arm clamps the screening trough 450 and extends into the space where the collecting 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, thereby ensuring the cleaning efficiency and cleaning effect of the screening trough 450. It can be understood that cleaning brushes are provided at the two relatively close ends of the U-shaped arm, the U-shaped arm is stationary, and the cleaning brushes are connected to the motor through a transmission. The motor is provided on the top of the operating box 770, and the two cleaning brushes are connected through a chain, belt or gear transmission. Specifically, the upper cleaning brush is directly connected to the rotating shaft of the motor, and the upper cleaning brush is connected to a gear. The U-shaped arm is provided with a transmission gear, and the lower cleaning brush is also provided with a gear. The upper cleaning brush is connected to the lower cleaning brush through the gear, and the upper cleaning brush and the lower cleaning brush rotate in opposite directions. Of course, the rotation direction can also be set to the same. When the transmission route needs to change direction, a bevel gear is set on the U-shaped arm to change the transmission direction.

[0061] It can be understood that the cleaning device 700 also includes an operating box 770, in which the collecting hopper 710, the sealing cover 720 and the cleaning brush 730 are all arranged. A branch pipe is provided on the return pipe 740, and each branch pipe is connected to the corresponding air-powder pipe 900 through a control valve 760. The control valve 760 is opened individually and the others are closed, so as to ensure that the refluxed coal powder is returned to the preset air-powder pipe 900. Among them, the operating box 770 can serve as the destination for the transfer mechanism 600 to transfer the screening trough 450, and can also play an isolation role for the coal powder dumped from the screening trough 450 to prevent the coal powder from floating and spreading everywhere.

[0062] In some embodiments, a camera is also provided in the cabinet 800, which is used to shoot the position of the robotic arm in the cabinet 800. When there is no one on duty, the position of the robotic arm in the cabinet 800 can be observed through remote video, so as to facilitate remote control of the robotic arm. The power sources of the movable parts in the cabinet 800 are all electrically connected to the central control device, and the operator can adjust the movable parts in the cabinet 800 through the central control device. The so-called movable parts include robotic arms, vibrators, motors and lifting cylinders of cleaning devices, etc. The central control device includes computers, PLCs or servers, etc. The settings and electrical connection methods of these can be based on the routine operations of technical personnel in this field.

[0063] In some embodiments, an air purification device 140 is further included. The air purification device 140 is disposed within the cabinet 800 and is used to absorb coal dust floating within 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 blower, which draws air from the cabinet 800 into the adsorption tank. The activated carbon particles in the adsorption tank then adsorb the coal dust. The activated carbon particles in the adsorption tank can be replaced with other adsorption materials, such as water, sponge, etc.

[0064] A method for detecting coal fineness, using a multi-point patrol coal fineness detection device according to the first embodiment of the present invention, comprises the following steps:

[0065] S1, stacking the screening tanks 450 in the cabinet 800;

[0066] S2, one of the solenoid valves 210 is opened, while the other solenoid valves 210 remain closed, and the pulverized coal in the sampling mechanism 100 corresponding to the opened solenoid valve 210 is fed to the feeding mechanism 200. When a predetermined weight of pulverized coal has accumulated in the feeding mechanism 200, the opened solenoid valve 210 is closed, and the feeding mechanism 200 is opened to feed the pulverized coal into the screening tank 450 through the bellows 300;

[0067] S3, the screening mechanism 400 drives the screening trough 450 to vibrate and screen, isolating the coal powder of different particle sizes and retaining them in the corresponding screening trough 450, and stops screening after a predetermined time;

[0068] S4: Use the transfer mechanism 600 to transfer the topmost screening trough 450 to the weighing mechanism 500 for weighing and calculating the fineness of the pulverized coal. After weighing, the screening trough 450 is clamped to the collecting hopper 710 and the pulverized coal is dumped. The collecting hopper 710 collects the pulverized coal and returns it to the air-powder pipe 900.

[0069] S5, using the transfer mechanism 600 to transfer the screening troughs 450 after the coal powder has been dumped to the intermediate transfer rack 130 for placement, until the last screening trough 450 is transferred to the intermediate transfer rack 130;

[0070] S6, using the transfer mechanism 600 to clamp the screening slots 450 on the intermediate transfer rack 130 from top to bottom and put them back into the cabinet 800 in sequence;

[0071] S7, repeat steps S2 to S6.

[0072] It should be noted that in step S1, the screening troughs 450 are initially stacked on the placement table 420. In order to achieve multi-point patrol detection, the solenoid valves 210 are only opened one at a time, so that the coal powder in the powder tube 900 is sampled and weighed. The predetermined weight of coal powder accumulated in the feeding mechanism 200 can be sensed by setting a gravity sensor on the feeding mechanism 200 to sense gravity, and 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 under the gravity sensor. When the 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.

[0073] It can be understood that in step S4, after the transfer mechanism 600 transfers the topmost screening slot 450, the next topmost screening slot 450 appears in the remaining stacked screening slots 450, and the weighing is carried out from top to bottom until the bottommost screening slot 450 in the stacked screening slots 450 is weighed. After the weighing is completed, the weight ratio of the coal powder of each fineness after screening is converted to obtain the comprehensive fineness of the coal powder in this air-powder tube 900.

[0074] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0075] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A multi-point patrol coal powder fineness detection device, characterized in that: The cabinet comprises a cabinet body, on which are mounted: A plurality of sampling mechanisms are provided, each of the sampling mechanisms being configured to extract a mixture of air and coal powder from an air-powder pipe; The feeding mechanism is connected to the plurality of sampling mechanisms respectively through a plurality of solenoid valves, and the plurality of solenoid valves are provided in a one-to-one correspondence with the plurality of sampling mechanisms; A bellows, the upper end of which is connected to the discharge port of the feeding mechanism, the bellows comprising a plurality of main body sections and a plurality of narrowing sections, the main body sections and the narrowing sections being alternately arranged, the diameter of the main body section being larger than the diameter of the narrowing section, the upper end of the narrowing section being connected to the main body section via a first inclined surface, and the lower end of the narrowing section being connected to another main body section via a second inclined surface, the angle between the first inclined surface and the vertical surface being between 0° and 30°, and the angle between the second inclined surface and the vertical surface being between 45° and 90°, the inner sides of the first inclined surface and the inner sides of the second inclined surface being both provided with a silicon carbide coating, and the wall thickness of the narrowing section being smaller than the wall thickness of the main body section; a screening mechanism comprising a plurality of vertically stacked screening slots, wherein the screen hole diameter of the screening slots in the upper layer is larger than the screen hole diameter of the screening slots in the lower layer, and the screening slots in the uppermost layer are connected to the lower end of the bellows, and the screening mechanism is used to screen coal powder; A weighing mechanism, used for weighing the screening tank; a transfer mechanism configured to transfer the screening trough between the screening mechanism and the weighing mechanism; The screening mechanism includes a vibrator, a placement platform is provided on the vibrator, the placement platform is used to place the screening slot, a bracket is provided on the placement platform, a pressure cover is vertically slidably connected to the bracket, the pressure cover is used to press the uppermost screening slot, and the pressure cover is connected to the lower end of the bellows; It also includes a cleaning device, which includes a collecting hopper, a cover and a cleaning brush. The collecting hopper is arranged in the cabinet, and the opening of the collecting hopper is arranged upward. The lower end of the collecting hopper is connected to the air-powder pipe through a return pipe. A negative pressure adsorber is provided on the return pipe. The negative pressure adsorber is used to suck the coal powder from the collecting hopper into the air-powder pipe. The cover is arranged in the cabinet along a vertical sliding manner. The cover is used to close the upper end opening of the collecting hopper. The cleaning brush is rotatably arranged on the cover. The collecting hopper is used to recover the coal powder in the screening trough after weighing, and the cleaning brush is used to clean the coal powder attached to the inner wall of the collecting hopper.

2. The multi-point patrol coal powder fineness detection device according to claim 1 is characterized in that: The corrugated pipe is made of polyethylene, and a metal mesh is embedded in the inner wall of the corrugated pipe.

3. The multi-point patrol coal powder fineness detection device according to claim 1 is characterized in that: The sampling mechanism includes a sampling tube and a separator. There are multiple sampling tubes. The separator is arranged in a one-to-one correspondence with the sampling tube. The sampling tube is configured to extract a mixture of air and coal powder from an air-powder tube. The separator is connected to the sampling tube. The separator is used to separate air and coal powder. The powder outlet of the separator is connected to the feeding mechanism through an electromagnetic valve.

4. The multi-point patrol coal powder fineness detection device according to claim 1 is characterized in that: Two extension arms are provided on the screening trough, and the extension arms are arranged in an I-shape. The I-shaped extension arms are composed of two vertical plates and a horizontal plate. A rubber layer is provided on the horizontal plate. The transfer mechanism contacts the rubber layer when clamping the extension arms.

5. The multi-point patrol coal powder fineness detection device according to any one of claims 1 to 4, characterized in that: It also includes a transfer rack, which is arranged in the cabinet and is used to carry the screening trough.

6. The multi-point patrol coal powder fineness detection device according to claim 1 is characterized in that: It also includes an air purification device, which is arranged in the cabinet and is used to absorb coal powder floating in the cabinet.

7. The multi-point patrol coal powder fineness detection device according to claim 6 is characterized in that: The air purification device comprises an adsorption tank filled with activated carbon particles.

8. A method for detecting coal powder fineness, characterized in that: The coal powder fineness detection device according to claim 5 is applied, comprising the following steps: S1, placing the screening tanks in a stacked manner in the cabinet; S2, opening one of the solenoid valves while keeping the other solenoid valves closed, feeding the pulverized coal in the sampling mechanism corresponding to the opened solenoid valve to the feeding mechanism; when a predetermined weight of pulverized coal is accumulated in the feeding mechanism, closing the opened solenoid valve and opening the feeding mechanism to feed the pulverized coal into the screening tank through the bellows; S3, the screening mechanism drives the screening trough to vibrate and screen, isolating the coal powder of different particle sizes and retaining them in the corresponding screening troughs, and stops screening after a predetermined time; S4, using the transfer mechanism to transfer the uppermost screening trough to the weighing mechanism for weighing and calculating the fineness of the pulverized coal. After weighing, the screening trough is clamped to the collecting hopper to dump the pulverized coal. The collecting hopper collects the pulverized coal and returns it to the air-powder pipe; S5, using the transfer mechanism to transfer the screening troughs after the coal powder has been emptied to the intermediate transfer rack, until the last screening trough is transferred to the intermediate transfer rack; S6, using the transfer mechanism to clamp the screening slots on the intermediate transfer rack from top to bottom and place them back into the cabinet in sequence; S7, repeat steps S2 to S6.

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