Coal quality testing equipment and methods

Abstract

The present invention discloses a coal quality detection device and detection method, which is applicable to an air-powder pipeline system with a sampling extension tube. The device adopts a modular structural design, integrating a multi-channel sampling component, a cyclone separation unit, a vibrating feeding mechanism, a weighing detection module, a burning analysis device and an automatic transfer robotic arm in the cabinet. The detachable sampling tube group is used to realize synchronous sampling of multiple pipelines, and an independent cyclone separation cylinder is used to complete gas-solid separation; the innovatively designed electromagnetic vibrating feeder adopts an alternating magnetic field to drive the permanent magnet vibration structure, and cooperates with variable frequency speed regulation to realize accurate feeding of coal powder; the weighing device and the burning detection device establish a closed-loop detection process through the robotic arm, which can automatically complete the whole process detection of coal powder sampling, separation, weighing, burning and residue weighing. This equipment realizes the automation of online coal quality detection, significantly improves the detection efficiency and accuracy, and is suitable for the real-time monitoring needs of coal quality in industrial scenarios such as thermal power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of coal quality detection devices, and in particular to coal quality detection equipment and a detection method. Background Art

[0002] For thermal power units that burn pulverized coal, the quality of the pulverized coal blown into the furnace has a great impact on the economy and safety of combustion. Due to the current limitations of the industry's technological development level, current coal quality testing usually involves sampling from the main coal feeding belt. After sample preparation and burning in the laboratory, the coal quality parameters are calculated based on the burning values ​​and fed back to the boiler operators and coal blending personnel.

[0003] Since this coal quality detection method has serious lag and poor sampling representativeness, the coal quality test values ​​have little guiding significance for on-site operation adjustment personnel. Therefore, there is an urgent need for a device that can directly sample and detect on the air-powder pipeline for coal powder input. 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 provides a coal quality detection device that can measure coal quality online and provide better guidance for on-site personnel.

[0005] The present invention also provides a coal quality detection method using the above-mentioned coal quality detection equipment.

[0006] According to a first embodiment of the present invention, a coal quality testing device is applied to an air-powder pipeline with a sampling extension tube, comprising a cabinet, a sampling tube disposed within the cabinet, a cyclone separator, a vibrating feeder, a weighing device, a burn detection device, and a robotic arm. Multiple sampling tubes are provided, each detachably connected to the sampling extension tube. Each sampling tube is configured to sample a single air-powder pipeline. The cyclone separators are disposed one-to-one with the sampling tubes, with the other end of the sampling tube connected to the inlet of the corresponding cyclone separator. The vibrating feeder comprises an electromagnet, a permanent magnet, a frequency converter, and a feed tube. The electromagnet and frequency converter are connected to an AC circuit. The permanent magnet is hinged to the cabinet via a torsion spring. The torsion spring is used to drive one end of the permanent magnet to abut the feed tube. The electromagnet is used to generate an alternating magnetic field to attract or repel the permanent magnet, causing it to vibrate. The permanent magnet can transmit the excitation force to the feed tube. The powder outlets of the multiple cyclone separators are connected to the feed tube in parallel via valves. The weighing device is used to support the container and weigh the coal powder in the container, and the feeding pipe can discharge the coal powder into the container on the weighing device; the burning detection device is used to burn the coal powder in the container and perform weighing detection; the robotic arm is arranged between the weighing device and the burning detection device, and the robotic arm is configured to clamp the container on the weighing device and transfer it to the burning detection device, or transfer the container in the burning detection device to the weighing device after the burning detection device burns the coal powder.

[0007] It has at least the following beneficial effects:

[0008] The sampling tubes installed take samples directly from the air-powder duct, avoiding the lag of traditional methods and providing real-time feedback on coal quality data, providing immediate guidance for boiler operation and coal blending, and significantly improving combustion economy and safety. Multiple sampling tubes can be connected to multiple air-powder ducts at the same time, ensuring comprehensive coverage of coal powder samples and enhancing the representativeness and accuracy of the test results. The various devices are integrated into a single cabinet, with the container automatically transferred by a robotic arm and the coal powder accurately transported by a vibrating feeder. The weighing device and the burn detection device are linked for detection, reducing manual intervention, improving detection efficiency, and reducing errors. The vibrating feeding design based on electromagnets and permanent magnets achieves controllable alternating magnetic fields through a frequency converter, which also makes the vibration frequency controllable, preventing coal powder from clogging the feed pipe and ensuring continuous and uniform feeding. The modular design of each device in the entire equipment facilitates equipment maintenance and expansion, and adapts to the coal quality testing needs of air-powder ducts of different sizes.

[0009] According to some embodiments of the present invention, the vibrating feeder further includes an excitation frame, which is connected to the cabinet via a coil spring, and the torsion spring is used to drive one end of the permanent magnet to abut against the excitation frame.

[0010] According to some embodiments of the present invention, a contact wheel is provided on the excitation frame, and one end of the permanent magnet abuts against the contact wheel.

[0011] According to some embodiments of the present invention, the feeding pipe is arranged to be inclined downward.

[0012] According to some embodiments of the present invention, the valve is connected to the feeding pipe via a bellows.

[0013] According to some embodiments of the present invention, a discharge pipe is further included, which is connected to the feed pipe. A solenoid valve is provided on the discharge pipe. The solenoid valve is used to control the amount of coal powder discharged from the discharge pipe. The discharge pipe is used to discharge coal powder into the container on the weighing device.

[0014] According to some embodiments of the present invention, the weighing device is electrically connected to the electromagnet via the control module, and when the weighing device reaches a predetermined weight, the electromagnet stops working.

[0015] According to some embodiments of the present invention, a storage table is further included. The storage table is arranged in the cabinet and is used to store containers. The robotic arm is used to grab the containers from the storage table and transfer them to the weighing device.

[0016] According to some embodiments of the present invention, a cleaning device is also included, which includes a supporting platform, a lifting cylinder, a cover body, a cleaning brush and a dust suction pipe. The supporting platform and the lifting cylinder are both arranged in a cabinet. The supporting platform is used to place a container after burning coal powder. The cover body is connected to the lifting cylinder. The lifting cylinder is used to drive the cover body to lift and lower to cover or detach from the container opening on the supporting platform. The cleaning brush is rotatably connected to the lower end of the cover body. The cleaning brush is configured to extend into the container on the supporting platform. One end of the dust suction pipe is connected to the cleaning brush, and the other end of the dust suction pipe is connected to the air powder duct. The inner cavity of the cleaning brush is provided with a turbine blade. The dust suction pipe can drive the cleaning brush to rotate through the turbine blade to clean the container on the supporting platform during vacuuming.

[0017] According to the second embodiment of the present invention, the coal quality detection method uses a coal quality detection device, including the following steps:

[0018] S1, connect each sampling tube to the sampling extension tube on the corresponding air-powder duct;

[0019] S2, starts the electromagnet to make the feeding pipe vibrate under the alternating magnetic field of the permanent magnet and the electromagnet;

[0020] S3, opening the corresponding valve to allow the pulverized coal in the corresponding cyclone to fall into the feed pipe. Under the vibration of the feed pipe, the pulverized coal is transported into the container on the weighing device and weighed;

[0021] In step S4, the container on the weighing device is clamped by a robotic arm and placed in the ignition detection device for weighing and ignition. Based on the ignition loss, the moisture, volatile matter, fixed carbon and ash content of the pulverized coal are calculated step by step. The calorific value of the pulverized coal is calculated based on this to evaluate the quality of the coal.

[0022] S5, after the burning is completed, the robot arm moves the container from the burning detection device to the cleaning device for cleaning, and then the robot arm moves the container to the weighing device to wait for the next coal powder sample to arrive.

[0023] At least the following beneficial effects are achieved: This coal quality detection method has all the beneficial effects brought about by the above-mentioned coal quality detection equipment, which will not be repeated here.

[0024] 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

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0026] Figure 1 This is a structural diagram of a coal quality detection device according to an embodiment of the present invention;

[0027] Figure 2 This is a structural schematic diagram of a vibrating feeder of a coal quality detection device according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic structural diagram of a cleaning device for a coal quality detection device according to an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the structure of the sampling extension tube and the sampling tube of the coal quality detection device according to an embodiment of the present invention.

[0030] Figure Number:

[0031] Sampling tube 100, nut 110, top block 120, sealing ring 130, storage table 140, valve 150, container 160;

[0032] Cyclone separation cylinder 200;

[0033] Vibrating feeder 300, electromagnet 310, permanent magnet 320, frequency converter 330, feeding tube 340, torsion spring 350, bellows 360;

[0034] Discharge pipe 370, solenoid valve 371, vibration frame 380, contact wheel 381;

[0035] Weighing device 400, burning detection device 500, robotic arm 600;

[0036] Cleaning device 700, supporting platform 710, lifting cylinder 720, cover 730, cleaning brush 740, turbine blade 741, dust suction pipe 750;

[0037] Air powder duct 800, sampling extension tube 810, blocking block 820, elastic member 830;

[0038] Cabinet body 900 and flattening scraper 910. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Reference Figures 1 to 4 The present invention discloses a coal quality detection device, which is applied to an air-powder duct 800 with a sampling extension tube 810, and includes a cabinet 900 and a sampling tube 100, a cyclone separator 200, a vibrating feeder 300, a weighing device 400, a burning detection device 500, and a robotic arm 600. It should be noted that the sampling extension tube 810 is a pipe provided on the air-powder duct 800, and the so-called air-powder duct 800 refers to the pipe that feeds fuel to the boiler of a power plant. That is, after the coal is ground into powder and then separated, the coal powder and air (that is, wind) are mixed at the outlet of the pulverizer and then sent to the boiler for combustion. The pipe where the coal powder and air are mixed and circulated is the air-powder duct 800. Sampling and real-time detection from this pipe can more accurately reflect the coal quality. This is mainly used for online detection of coal quality. It should be noted that a flattening scraper 910 is also installed inside the cabinet 900. When the container 160 is loaded into the burning detection device 500, the flattening scraper 910 rotates to flatten the coal powder inside the container 160, ensuring uniform burning of the coal powder inside the container 160 and ensuring detection accuracy and quality. It is understood that the flattening scraper 910 is rotatably installed inside the cabinet 900. Specifically, the cabinet 900 is equipped with an electric cylinder for lifting, the motor is installed on the lifting module of the electric cylinder, and the flattening scraper 910 is connected to the rotating shaft of the motor. Each sampling tube 100 is connected to an air-powder duct 800, and the recovery duct is connected to the corresponding air-powder duct 800 through a branch, and the branch is equipped with a valve. Only a portion of the air-powder duct 800 is shown.

[0043] Reference Figure 1 Multiple sampling tubes 100 are provided, each detachably connected to a sampling extension tube 810. Each sampling tube 100 is configured to sample a single air-dust duct 800. A cyclone separator 200 is provided in a one-to-one correspondence with each sampling tube 100, with the other end of the sampling tube 100 connected to the inlet of the corresponding cyclone separator 200. It will be appreciated that multiple sampling tubes 100 enable sampling of multiple air-dust ducts 800, enabling coal quality sampling and testing of multiple air-dust ducts 800 using a single device, saving equipment space and costs. A negative pressure fan can be added to the pipeline between the sampling tube 100 and the cyclone separator 200 to absorb the coal dust. It will be appreciated that the cyclone separator 200 is conventional equipment.

[0044] Reference Figure 2The vibrating feeder 300 includes an electromagnet 310, a permanent magnet 320, a frequency converter 330 and a feeding pipe 340. The electromagnet 310 and the frequency converter 330 are connected to the AC circuit. The permanent magnet 320 is hinged to the cabinet 900 through a torsion spring 350. The torsion spring 350 is used to drive one end of the permanent magnet 320 to abut against the feeding pipe 340. The electromagnet 310 is used to generate an alternating magnetic field to attract or repel the permanent magnet 320, so that the permanent magnet 320 vibrates. The permanent magnet 320 can transmit the exciting force to the feeding pipe 340. The powder outlet of the multiple cyclone separation drums 200 They are all connected in parallel to the feed pipe 340 through valve 150. It should be noted that the AC circuit provides alternating current to the electromagnet 310, and the electromagnet 310 generates an alternating magnetic field under the action of the alternating current, while the magnetic field direction of the permanent magnet 320 remains unchanged. When the electromagnet 310 generates an alternating magnetic field, the permanent magnet 320 can be attracted and repelled at a certain frequency, thereby achieving vibration. The frequency converter 330 can control the frequency of the alternating magnetic field by changing the frequency, thereby controlling the frequency of the vibration. A variable resistor for controlling the current can also be connected to the AC circuit. Of course, an ordinary exciter can also be directly used and set below the feed pipe 340 to achieve the transportation of coal powder by vibrating the feed pipe 340. It is understandable that a rectifier can also be connected to the electrical circuit of the electromagnet 310, and the rectifier can be used to convert the current into a pulse current, thereby achieving the alternation between the magnetic and non-magnetic states of the electromagnet 310.

[0045] It should be noted that one end of the permanent magnet 320 abuts the feeding tube 340. When the alternating current causes the electromagnet 310 to generate an alternating magnetic field, the electromagnet 310 attracts or repels the permanent magnet 320. Because one end of the permanent magnet 320 abuts the feeding tube 340, during the repeated swinging of the permanent magnet 320, it can periodically push the feeding tube 340, thereby causing the feeding tube 340 to vibrate in a predetermined direction. The vibration frame 380 arranged below the feeding tube 340 is connected to the cabinet 900 through a coil spring. The presence of the coil spring can drive the contact wheel 381 on the vibration frame 380 to maintain abutment with the permanent magnet 320. This can reduce the impact of the permanent magnet 320 on the contact wheel 381 during the swinging process, providing a stable excitation force. Of course, the impact of the permanent magnet 320 on the contact wheel 381 during the swinging process can essentially provide an excitation force, and can also transport the material in the feeding tube 340.

[0046] Reference Figure 1The weighing device 400 is used to support the container 160 and weigh the pulverized coal in the container 160. The feed pipe 340 can discharge the pulverized coal into the container 160 on the weighing device 400. The burning detection device 500 is used to burn the pulverized coal in the container 160 and perform weighing detection. The robotic arm 600 is disposed between the weighing device 400 and the burning detection device 500. The robotic arm 600 is configured to grasp the container 160 on the weighing device 400 and transfer it to the burning detection device 500, or to transfer the container 160 in the burning detection device 500 to the weighing device 400 after the burning detection device 500 burns the pulverized coal. It should be noted that the container 160 is a crucible, and the so-called weighing device 400 is used to weigh the initially collected pulverized coal so that the amount of pulverized coal discharged from the feed pipe 340 is a predetermined amount. The weighing device 400 is a common electronic scale in the field.

[0047] It should be understood that the sampling tube 100 is installed to directly sample the air-powder duct 800, avoiding the lag associated with traditional methods. It provides real-time feedback on coal quality data, providing immediate guidance for boiler operation and coal blending, and significantly improving combustion efficiency and safety. Multiple sampling tubes 100 can be connected to multiple air-powder ducts 800 simultaneously, ensuring comprehensive coverage of pulverized coal samples and enhancing the representativeness and accuracy of test results. All devices are integrated into a cabinet 900. A robotic arm 600 automatically transfers the container 160, a vibrating feeder 300 precisely delivers pulverized coal, and a weighing device 400 and burn detection device 500 perform coordinated testing, reducing manual intervention, improving detection efficiency, and reducing errors. The vibrating feeding design based on the electromagnet 310 and permanent magnet 320 utilizes a frequency converter 330 to achieve controllable alternating magnetic fields and vibration frequency, preventing pulverized coal from clogging the feed pipe 340 and ensuring continuous and uniform feeding. The modular design of each device of the entire equipment facilitates equipment maintenance and expansion, and adapts to the coal quality testing needs of air-powder pipelines of different sizes.

[0048] It should be noted that, referring to Figure 4 A sealing block 820 is slidably connected to the sampling extension tube 810, and the sealing block 820 is connected to the sampling extension tube 810 through an elastic member 830. The elastic member 830 drives the sealing block 820 to seal the sampling extension tube 810. A thread is provided on the outer peripheral wall of the sampling extension tube 810. One end of the sampling tube 100 is rotatably connected to a nut 110. A top block 120 is provided in the sampling tube 100, and a sealing ring 130 is provided in the nut 110. When the nut 110 is threadedly connected to the sampling extension tube 810, the top block 120 can push open the sealing block 820 to connect the air powder duct 800 and the sampling tube 100. The sealing ring 130 is used to seal the connection between the sampling tube 100 and the sampling extension tube 810.

[0049] Reference Figure 2The vibrating feeder 300 further includes a vibration frame 380, which is connected to the cabinet 900 via a coil spring. The torsion spring 350 is used to drive one end of the permanent magnet 320 to abut against the vibration frame 380. The vibration frame 380 is provided with a contact wheel 381, and one end of the permanent magnet 320 abuts against the contact wheel 381. The feed pipe 340 is arranged to be tilted downward. The valve 150 is connected to the feed pipe 340 via a bellows 360. The vibrating feeder 300 further includes a discharge pipe 370, which is connected to the feed pipe 340 and is provided with a solenoid valve 371. The solenoid valve 371 is used to control the amount of coal powder discharged from the discharge pipe 370. The discharge pipe 370 is used to discharge coal powder into the container 160 on the weighing device 400. It can be understood that the vibration frame 380 can achieve vibration in the up and down directions under the action of the coil spring. When the vibration of the permanent magnet 320 is transmitted to the contact wheel 381, the coil spring will also be compressed. That is, the vibration frame 380 can drive the feeding pipe 340 to vibrate in the up and down directions. Of course, the feeding pipe 340 also vibrates along its axial direction, so that the coal powder in the feeding pipe 340 can be vibrated and discharged.

[0050] In some embodiments, the weighing device 400 is electrically connected to the electromagnet 310 through a control module. When the weighing device 400 reaches a predetermined weight, the electromagnet 310 stops working. It should be noted that the so-called control module can be a PLC microcontroller or a computer.

[0051] Reference Figure 1 , and also includes a storage table 140, which is arranged in the cabinet 900. The storage table 140 is used to store containers 160. The robotic arm 600 is used to grab the containers 160 from the storage table 140 and transfer them to the weighing device 400. It can be understood that the storage table 140 is mainly used as a transfer and temporary storage container 160 when burning coal powder in multiple containers 160, and can also navigate and position the movement of the robotic arm 600.

[0052] Reference Figure 3, also includes a cleaning device 700, the cleaning device 700 includes a supporting platform 710, a lifting cylinder 720, a cover 730, a cleaning brush 740 and a dust suction pipe 750, the supporting platform 710 and the lifting cylinder 720 are both arranged in the cabinet 900, the supporting platform 710 is used to place the container 160 after the pulverized coal is burned, the cover 730 is connected to the lifting cylinder 720, and the lifting cylinder 720 is used to drive the cover 730 to rise and fall to cover or detach the container on the supporting platform 710 160, the cleaning brush 740 is rotatably connected to the lower end of the cover body 730, and the cleaning brush 740 is configured to extend into the container 160 on the support platform 710. One end of the dust suction tube 750 is connected to the cleaning brush 740, and the other end of the dust suction tube 750 is connected to the air powder duct 800. The inner cavity of the cleaning brush 740 is provided with a turbine blade 741. The dust suction tube 750 can drive the cleaning brush 740 to rotate through the turbine blade 741 to clean the container 160 on the support platform 710 when vacuuming.

[0053] A coal quality detection method, using coal quality detection equipment, includes the following steps:

[0054] S1, connect each sampling tube 100 to the sampling extension tube 810 on the corresponding air-powder duct 800;

[0055] S2, start the electromagnet 310 to make the feeding tube 340 vibrate under the alternating magnetic field of the permanent magnet 320 and the electromagnet 310;

[0056] S3, opening the corresponding valve 150, allowing the pulverized coal in the corresponding cyclone separation drum 200 to fall into the feeding pipe 340. Under the vibration of the feeding pipe 340, the pulverized coal is transported to the container 160 on the weighing device 400 and weighed;

[0057] S4, the container 160 on the weighing device 400 is clamped by the robotic arm 600 and placed in the burning detection device 500 for weighing and burning. Based on the loss on ignition, the moisture, volatile matter, fixed carbon, and ash content of the pulverized coal are calculated step by step. Based on this, the calorific value of the pulverized coal is calculated to assess the quality of the coal.

[0058] S5, after the burning is completed, the robot arm 600 clamps and moves the container 160 from the burning detection device 500 to the cleaning device 700 for cleaning, and then the robot arm 600 moves the container 160 to the weighing device 400 to wait for the next coal powder sample to arrive.

[0059] It is understandable that the burning detection device 500 is an existing device, which mainly measures the quality of coal powder by burning. It will not be repeated here. In step S5, the cleaning device 700 mainly drives the cover body 730 and the cleaning brush 740 to descend after detecting that the container 160 is in place. When the cover body 730 covers the container 160, the dust suction pipe 750 starts to suck the dust in the container 160. During the suction process, the cleaning brush 740 will be driven to rotate by the turbine blade 741, and the container 160 can also be cleaned. Of course, a motor can also be set on the cantilever beam connected to the lifting cylinder 720. The main shaft of the motor is connected to the cover body 730. The motor directly drives the cover body 730 to rotate to achieve a circular cleaning of the inner wall of the container 160. Of course, the motor cannot keep rotating in one direction. The motor can rotate alternately in forward and reverse directions to prevent the dust suction pipe 750 from being cut.

[0060] It should be noted that only one valve 150 is opened each time for sampling, in order to sample one air-powder pipe 800. During a round-robin sampling process, the air-powder pipe 800 is not sampled repeatedly, that is, each valve 150 is opened once, and a sample is taken for testing, until all air-powder pipes 800 are sampled and tested. This is one round-robin.

[0061] 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.

[0062] 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. Coal quality testing equipment, characterized in that, Applicable to an air-powder duct with a sampling extension tube, comprising a cabinet and: A plurality of sampling tubes are provided, each of which is detachably connected to the sampling extension tube, and each of the sampling tubes is configured to sample an air-powder duct; A cyclone separation cylinder is provided corresponding to each of the sampling tubes, and the other end of the sampling tube is connected to the inlet of the corresponding cyclone separation cylinder; A vibrating feeder comprising an electromagnet, a permanent magnet, a frequency converter, and a feeding pipe, wherein the electromagnet and the frequency converter are connected to an AC circuit, the permanent magnet is hinged to the cabinet via a torsion spring, the torsion spring is used to drive one end of the permanent magnet to abut against the feeding pipe, the electromagnet is used to generate an alternating magnetic field to attract or repel the permanent magnet, causing the permanent magnet to vibrate, and the permanent magnet can transmit the exciting force to the feeding pipe, and the powder outlets of the multiple cyclone separation drums are all connected to the feeding pipe in parallel via valves; a weighing device for supporting a container and weighing the pulverized coal in the container, wherein the feeding pipe is capable of discharging the pulverized coal into the container on the weighing device; Burning detection device, used to burn the coal powder in the container and perform weighing detection; a robotic arm disposed between the weighing device and the burn detection device, the robotic arm being capable of gripping or releasing a container, and being configured to move back and forth between the weighing device and the burn detection device; The vibrating feeder further comprises an excitation frame, the excitation frame being connected to the cabinet via a coil spring, the torsion spring being used to drive one end of the permanent magnet to abut against the excitation frame; The weighing device is electrically connected to the electromagnet through a control module, and when the weighing device reaches a predetermined weight, the electromagnet stops working; The cleaning device also includes a supporting platform, a lifting cylinder, a cover, a cleaning brush and a dust suction pipe. The supporting platform and the lifting cylinder are both arranged in the cabinet. The supporting platform is used to place the container after the coal powder is burned. The cover is connected to the lifting cylinder. The lifting cylinder is used to drive the cover to lift and lower to cover or detach from the container opening on the supporting platform. The cleaning brush is rotatably connected to the lower end of the cover, and the cleaning brush is configured to extend into the container on the supporting platform. One end of the dust suction pipe is connected to the cleaning brush, and the other end of the dust suction pipe is connected to the air powder duct. The inner cavity of the cleaning brush is provided with a turbine blade, and the dust suction pipe can drive the cleaning brush to rotate through the turbine blade to clean the container on the supporting platform during dust suction.

2. The coal quality detection equipment according to claim 1, characterized in that: A contact wheel is provided on the excitation frame, and one end of the permanent magnet abuts against the contact wheel.

3. The coal quality detection equipment according to claim 1, characterized in that: The feeding pipe is arranged to be inclined downward.

4. The coal quality detection equipment according to claim 3, characterized in that: The valve is connected to the feeding pipe through a bellows.

5. The coal quality detection equipment according to claim 4, characterized in that: It also includes a discharge pipe, which is connected to the feed pipe. The discharge pipe is provided with a solenoid valve, which is used to control the amount of coal powder discharged from the discharge pipe. The discharge pipe is used to discharge coal powder into the container on the weighing device.

6. The coal quality detection equipment according to claim 1, characterized in that: It also includes a storage platform, which is arranged in the cabinet and is used to store containers. The robotic arm is used to grab the container from the storage platform and transfer it to the weighing device.

7. A method for detecting coal quality, characterized in that: The coal quality detection device according to claim 1 is applied, comprising the following steps: S1, connecting each of the sampling tubes to the sampling extension tube on the corresponding air-powder duct; S2, starting the electromagnet to cause the feeding pipe to vibrate under the alternating magnetic field of the permanent magnet and the electromagnet; S3, opening the corresponding valve to allow the pulverized coal in the corresponding cyclone separation drum to fall into the feeding pipe. Under the vibration of the feeding pipe, the pulverized coal is transported and falls into the container on the weighing device and is weighed; S4, the container on the weighing device is clamped by the robotic arm and placed in the burning detection device for weighing and burning. According to the loss on ignition, the moisture, volatile matter, fixed carbon and ash content of the pulverized coal are calculated step by step, and the calorific value of the pulverized coal is calculated based on the loss on ignition to evaluate the quality of the coal. S5, after the burning is completed, the robot arm clamps and moves the container from the burning detection device to the cleaning device for cleaning, and then the robot arm moves the container to the weighing device to wait for the next coal powder sample to arrive.

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