A system for detecting ash content of coal produced by a pulping process

Abstract

The present application relates to the technical field of coal detection, and discloses a pulp method coal ash detection system, which comprises a mixing hopper, a liquid bottle, a coal chute, a weight detector, a computer, a gray scale detector and a liquid supply pipe. A liquid blocking plate is slidably arranged between the transfer pipe and the liquid bottle, and the liquid blocking plate blocks the liquid drops of the liquid bottle. The bottom of the coal chute is provided with a turnover platform, the two plate bodies of the turnover platform are driven to rotate by a motor, the coal chute is fixed on one plate body, and the other plate body is installed on a fixed surface through a weight sensor. The technical scheme adopts a drop reduction barrier method matched with a dynamic concave flat switching method to improve the quality detection precision of liquid and solid, and simultaneously improve the feeding precision of solid. A gradually enhanced gas supply mode is coupled with a short-stroke residual removal process and a long-stroke water film removal process, so that the airflow intensity, the opening sequence and the functional purpose are linearly connected, the precision is improved, and the characteristics of high measurement frequency and long continuous cycle of the coal preparation plant are met.

Description

Technical Field

[0001] This invention relates to the field of coal testing technology, specifically a slurry-based coal ash content testing system. Background Technology

[0002] Coal ash content testing is mainly used in the coal preparation process. After flotation, clean coal is obtained. The sample preparation method involves precisely pressing the coal into cakes for testing. However, the uneven mass distribution of these cakes easily leads to testing errors. A slurry method, utilizing the dispersion of solids and liquids, delivers the dispersion to the analyzer. This method offers higher accuracy compared to the pressed sample method.

[0003] However, the specific operation mainly consists of the following steps: selecting fine coal with a particle size of less than 1mm to prepare a mixed slurry. During this process, it is necessary to avoid residues during weighing to ensure the accuracy of the slurry proportions. Secondly, there are adhesion problems formed on the contact surfaces during material transportation, such as water films and adhering particles, which affect the accuracy of secondary detection.

[0004] Because coal preparation plants are combined with mining plants, the continuous large-scale coal beneficiation process involves frequent and long-term measurements in the coal preparation plant. Therefore, only by ensuring that the entire system is processed during the intervals between two tests in the continuous processing process, while avoiding residual testing issues, can continuous high-precision measurement be achieved. Summary of the Invention

[0005] The purpose of this invention is to provide a coal ash content detection system for slurry-based processes. This technical solution employs a drip-reduction barrier method combined with a dynamic concave-flat switching method to improve the accuracy of liquid and solid quality detection, while simultaneously improving the accuracy of solid feed. It couples a gradually increasing air supply method with short-stroke residue removal and long-stroke water film removal processes, ensuring a linear connection between airflow intensity, start-up sequence, and functional objectives. This simplifies control and facilitates continuous processing. While improving accuracy, it also meets the characteristics of frequent and long-term measurements in coal preparation plants, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A coal ash content detection system using a slurry preparation method includes a mixing hopper, a liquid bottle, a coal trough, a weighing device, a computer, an ash level detector, and a liquid supply pipe. The liquid supply pipe injects liquid into the liquid bottle. The computer obtains the solid-liquid weight in the liquid bottle and the coal trough via the weighing device. When the solid-liquid ratio reaches a set range, the computer controls the solid and liquid in the liquid bottle and the coal trough to enter the mixing hopper for mixing. The mixed slurry is then tested by the ash level detector, and the results are obtained by the computer. The liquid bottle and the mixing hopper are connected by a transfer pipe, and a baffle plate slides between the transfer pipe and the liquid bottle to prevent liquid from dripping from the liquid bottle.

[0008] The bottom of the coal trough is equipped with a tilting platform. The two plates of the tilting platform are driven to rotate by a motor. The coal trough is fixed on one plate, and the other plate is installed on a fixed surface by a weight sensor.

[0009] As a further embodiment of the present invention: the coal trough is replaced with a coal cylinder, the weighing device on the outside of the coal cylinder is controlled to rotate by a rotating component, and the rotation angle is not less than 90 degrees. The end of the coal cylinder has an elastic membrane. When the coal cylinder is vertical, the elastic membrane is concave and when the coal cylinder is horizontal, the elastic membrane is planar.

[0010] As a further embodiment of the present invention, it also includes a blowing manifold, which is connected from top to bottom to a liquid blowing pipe, a ring blowing pipe, and a box blowing pipe. The liquid blowing pipe is located above the liquid bottle, the ring blowing pipe is located on the inner wall of the flared end of the mixing hopper and is circular in shape, and the box blowing pipe extends into the grayscale detector.

[0011] As a further embodiment of the present invention: a detection box is installed inside the grayscale detector. The cross-sectional shape of the detection box is U-shaped. An overflow pipe, an inlet pipe, and a bottom drain pipe are arranged sequentially from top to bottom on one side of the detection box. The mixing hopper and the inlet pipe are connected through a conveying mechanism. The bottom drain pipe and the overflow pipe are connected to the waste liquid tank. The box blow pipe is connected to the other side of the detection box, and the height of the box blow pipe is not lower than that of the overflow pipe. The box blow pipe and the overflow pipe are arranged opposite to each other.

[0012] As a further embodiment of the present invention: a rotating disk rotates inside the coal cylinder, a pull rod is fixedly connected to the center of the bottom surface of the elastic membrane, the pull rod slides vertically within the guide sleeve, the pull rod is slidably connected to the rotating disk, the rotation axis of the rotating disk is consistent with the rotation axis of the weighing device outside the coal cylinder, when the coal cylinder is in a vertical state, the counterweight fixed on the periphery of the rotating disk is at the bottom, the top of the arc of the groove opened on the surface of the rotating disk is at the top, and the bottom slider of the pull rod is located at the arc of the groove.

[0013] As a further embodiment of the present invention: a piston is slidably connected inside the main air blowing pipe, and the piston is elastically connected to the bottom sealing end of the main air blowing pipe by a spring. As the kinetic energy supplied by the main air blowing pipe gradually increases, the piston gradually slides downward, and the liquid blowing pipe, the ring blowing pipe, and the box blowing pipe are opened in sequence.

[0014] As a further embodiment of the present invention: the top surface of the baffle plate has a "C"-shaped enclosure, the baffle plate is inclined to the opening side of the enclosure and the baffle plate completely covers the transfer pipe port, the baffle plate is driven to move by a rotary driver, and the sliding trajectory of the baffle plate is an arc or a straight line.

[0015] As a further embodiment of the present invention: the bottom of the liquid bottle is provided with a drip hole, and the drip hole is located above the liquid baffle.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This technical solution employs a drip-reduction barrier method combined with a dynamic concave-flat switching method to improve the accuracy of liquid and solid quality detection, while simultaneously enhancing the accuracy of solid feed. It couples a gradually increasing gas supply method with short-stroke residue removal and long-stroke water film removal processes, ensuring a linear connection between airflow intensity, start-up sequence, and functional objectives. This simplifies control and facilitates continuous processing. It improves accuracy while meeting the characteristics of frequent and long-duration measurements required in coal preparation plants. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional schematic diagram of a coal ash content detection system based on a pulping method;

[0020] Figure 2 This is a front view schematic diagram of a coal ash content detection system based on a pulping method.

[0021] Figure 3 A top view schematic diagram of a coal ash content detection system based on a pulping method;

[0022] Figure 4 This is a schematic front view cross-section of a coal ash content detection system based on a pulping method.

[0023] Figure 5 A three-dimensional schematic diagram of the blowing main pipe in a coal ash content detection system using a pulping method;

[0024] Figure 6 This is a schematic cross-sectional view of a coal cylinder in a coal ash content detection system based on a pulping method.

[0025] Figure 7 for Figure 6 A schematic diagram of the rotation of the coal cylinder;

[0026] Figure 8 This is a schematic cross-sectional view of the main air blowing pipe in a coal ash content detection system using a pulping method.

[0027] Figure 9This is a schematic diagram of the coal conveying process in a coal ash content detection system using a pulping method.

[0028] In the diagram: 100, Computer; 200, Grayscale Detector; 300, Main Air Blowing Pipe; 301, Liquid Blowing Pipe; 302, Ring Blowing Pipe; 303, Box Blowing Pipe; 304, Piston; 305, Spring; 400, Liquid Supply Pipe; 1, Mixing Hopper; 2, Transfer Pipe; 3, Liquid Bottle; 4, Coal Bottle; 41, Rotary Disc; 411, Counterweight; 412, Slide; 42, Elastic Membrane; 43, Pull Rod; 44, Guide Sleeve; 5, Baffle Plate; 51, Rotary Actuator; 6, Weighing Instrument; 7, Detection Box; 71, Overflow Pipe; 72, Liquid Inlet Pipe; 73, Bottom Drain Pipe; 74, Waste Liquid Tank; 75, Conveying Mechanism; 8, Coal Trough; 81, Tilting Platform; 82, Weighing Sensor. Detailed Implementation

[0029] Please see Figures 1-9 Example 1:

[0030] In this embodiment, the system includes a mixing hopper 1, a liquid bottle 3, a coal trough 8, a weighing device 6, a computer 100, an ash level detector 200, and a liquid supply pipe 400. The liquid supply pipe 400 injects liquid into the liquid bottle 3. The computer 100 obtains the solid-liquid weight in the liquid bottle 3 and the coal trough 8 through the weighing device 6. When the solid-liquid ratio reaches a set range, the computer controls the solid and liquid in the liquid bottle 3 and the coal trough 8 to enter the mixing hopper 1 for mixing. The mixed slurry enters the ash level detector 200 for detection, and the computer 100 obtains the results.

[0031] The above describes the current process for pulp ash content testing. To improve testing accuracy, the issues of liquid bottle 3, measurement accuracy, and discharge accuracy need to be addressed first. Liquid bottle 3 contains liquid with good fluidity, and a valve can be installed at the bottom of liquid bottle 3. To solve this problem, specific improvements are as follows:

[0032] In this embodiment: the liquid bottle 3 and the mixing hopper 1 are connected by a transfer pipe 2. A baffle plate 5 slides between the transfer pipe 2 and the liquid bottle 3 to block the liquid bottle 3 from dripping. The weighing device 6 outside the coal bottle 4 is controlled to rotate by a rotating component, and the rotation angle is not less than 90 degrees. The end of the coal bottle 4 has an elastic membrane 42. When the coal bottle 4 is vertical, the elastic membrane 42 is concave. When the coal bottle 4 is horizontal, the elastic membrane 42 is flat.

[0033] In this technical solution, the liquid bottle 3 is detected by the weighing device 6. Liquid is poured into the top of the liquid bottle 3. Due to the influence of gravitational potential energy, the liquid will impact the liquid bottle 3. The weight generated by the weighing device 6 under the impact will fluctuate. However, when the weighing device 6 obtains the target mass, the pouring stops. The liquid flow remaining in the air or the liquid remaining in the pipe will still enter the liquid bottle 3. In many cases, the actual weight in the liquid bottle 3 is greater than the collected weight. In a few cases, the actual weight in the liquid bottle 3 is less than the collected weight. If it is less than the collected weight, liquid can be replenished.

[0034] This improvement primarily addresses the adjustment when the actual weight inside liquid bottle 3 exceeds the collected weight. A baffle plate 5 is added between liquid bottle 3 and mixing hopper 1. The baffle plate 5 is located between the liquid bottle 3 and mixing hopper 1. A drip hole is provided at the bottom of liquid bottle 3, and the drip hole is located above the baffle plate 5. The top surface of the baffle plate 5 has a "C"-shaped enclosure. The baffle plate 5 is tilted towards the opening of the enclosure and completely covers the port of transfer pipe 2. The baffle plate 5 is driven to move by a rotary driver 51, and the sliding trajectory of the baffle plate 5 is either an arc or a straight line.

[0035] For example, after the liquid in bottle 3 is filled, the actual weight detected by the weighing device 6 is A+. The control system inside the computer 100 keeps the valve of bottle 3 and the rotary actuator 51 stationary. The liquid in bottle 3 drips slowly and intermittently through the drip hole, reducing the actual weight detected by the weighing device 6. When the actual weight detected by the weighing device 6 is A, the rotary actuator 51 controls the baffle plate 5 to slide, the top of the transfer pipe 2 is open, the bottom valve of bottle 3 opens, and the liquid enters the mixing hopper 1 through the transfer pipe 2. The drip interval can be controlled. Therefore, when the weighing device 6 collects the set mass, the opening mode of the rotary actuator 51 is controlled by delay, so that the opening delay of the rotary actuator 51 is greater than the drip delay but less than twice the drip delay. This is to prevent the liquid from dripping into the interior of the mixing hopper 1 after the baffle plate 5 moves away at the moment the liquid leaves bottle 3. The dripping liquid is then discharged to the outside through the opening due to gravity under the influence of the "C"-shaped enclosure and the tilted posture of the baffle plate 5.

[0036] The bottom of the coal trough 8 is provided with a tilting platform 81. The two plates of the tilting platform 81 are driven to rotate by a motor. The coal trough 8 is fixed on one plate, and the other plate is installed on the fixed surface by a weight sensor 82.

[0037] Please see Figure 9 The tilting platform 81 consists of two plates that are rotatably connected to each other. The coal trough 8 is fixed on the upper plate, and the lower plate is installed on the fixed surface by a weight sensor 82. The weight sensor 82 can measure the total weight of the tilting platform 81, the motor, and the coal trough 8. When the measured weight meets the standard, the plate is rotated by the motor, the coal trough 81 is tilted, and the clean coal falls into the mixing hopper 1.

[0038] Please see Figure 1 In this technical solution, the rotary driver 51 is driven by a motor to rotate the baffle plate 5 and expose the open end of the transfer pipe 2. Linear sliding can also be selected as required.

[0039] The clean coal containing the coal contains small solid particles. Due to van der Waals forces, these particles adhere more easily to the wall surface. Additionally, the valve structure can easily retain clean coal, leading to deviations in the overall weighing quality. To address this issue, the following improvements are made:

[0040] In this technical solution, the coal cylinder 4 stores refined coal. The coal cylinder 4 has the same weighing mechanism as the weighing device 6. The specific structure of the weighing device 6 in this technical solution is explained here; please refer to 2-3. The weighing device 6 has two rings, one of which is fixed to the outside of the coal cylinder 4, and the other ring slides below the fixed ring. A weight sensor is installed between the two rings. The lower sliding ring is rotatably connected to the support and driven by a motor. The motor is... Figure 2 The cylinder has a circular structure. The two rings are connected by a pressure sensor, which captures the weight of the coal cylinder 4 and the rings. Because clean coal is a solid particle, it can easily remain in the valve; therefore, the structure of the coal cylinder 4 has been redesigned. See details... Figures 6-7 The end of the coal cylinder 4 is sealed by an elastic membrane 42, which forms a recessed area to collect clean coal when the cylinder 4 is vertical. When the cylinder 4 is rotated to a horizontal position, the elastic membrane 42 is horizontal, making it easier for the clean coal collected on its surface to fall into the mixing hopper 1. Since the surface of the elastic membrane 42 is flat, an air blowing structure can be installed above the mixing hopper 1. A gentle breeze or weak wind along or at an angle to the elastic membrane 42 can easily blow away any remaining clean coal. The clean coal moves in the direction of the mixing hopper 1, preventing it from falling to other locations. However, if the cylinder 4 still has a cavity structure, this air blowing method is less effective at blowing away the coal. Furthermore, particles are more likely to remain at the corners of the container, or the clean coal may adhere more tightly to the corners of the cavity walls under the influence of wind.

[0041] Additional explanation: If a gas tube is added below coal cylinder 4, its weight will affect coal cylinder 4, making its mass difficult to control. To achieve dynamic movement of the elastic membrane 42 while ensuring the mass stability of coal cylinder 4, the specific implementation method is as follows:

[0042] The inside of the coal cylinder 4 has a rotating disk 41. A pull rod 43 is fixedly connected to the center of the bottom surface of the elastic membrane 42. The pull rod 43 slides vertically in the guide sleeve 44. The pull rod 43 is slidably connected to the rotating disk 41. The rotation axis of the rotating disk 41 is consistent with the rotation axis of the weighing device 6 outside the coal cylinder 4. When the coal cylinder 4 is in a vertical state, the counterweight block 411 fixed around the rotating disk 41 is located at the bottom, the top of the arc of the groove 412 opened on the surface of the rotating disk 41 is located at the top, and the bottom slider of the pull rod 43 is located at the arc of the groove 412.

[0043] Please see Figure 6 With the coal cylinder 4 in a vertical position, the counterweight 411 is at its lowest point under the influence of gravity. The pull rod 43, influenced by the slider and the vertical guidance of the guide sleeve 44, remains in its lowest position, stretching the elastic membrane 42. The elastic membrane 42 forms a concave surface to accommodate the clean coal. During rotation, the counterweight 411 remains relatively stationary. As the coal cylinder 4 rotates, the slider of the pull rod 43 slides to the end of the chute 412, where the distance between the end of the chute 412 and the edge of the rotating disk 41 is narrowest. The pull rod 43 rises, and the elastic membrane 42 gradually becomes flush, thus achieving material feeding. During this process, no external mechanisms are involved, and the mass of the coal cylinder 4 remains unchanged throughout the entire process. This ensures the accuracy of clean coal quality detection.

[0044] As a supplementary explanation, the elastic membrane 42 can also achieve complete gas blowing when the rotation angle of the coal cylinder 4 is less than 90 degrees, which only requires adjusting the trajectory of the chute 412.

[0045] Example 2:

[0046] The above methods improve the accuracy of liquid and solid mass detection and solve the problems of kinetic energy impact and solid cavity wall residue. However, they do not clean the entire motion channel. This embodiment makes further improvements to avoid residue:

[0047] It also includes a main air blowing pipe 300, which is connected from top to bottom to a liquid blowing pipe 301, a ring blowing pipe 302, and a box blowing pipe 303. The liquid blowing pipe 301 is located above the liquid bottle 3. The ring blowing pipe 302 is located on the inner wall of the flared end of the mixing hopper 1 and is circular in shape. The box blowing pipe 303 extends into the grayscale detector 200. A detection box 7 is installed inside the grayscale detector 200. The detection box 7 has a U-shaped cross-section. An overflow pipe 71, a liquid inlet pipe 72, and a bottom drain pipe 73 are arranged from top to bottom on one side of the detection box 7. The mixing hopper 1 and the liquid inlet pipe 72 are connected through... The conveying mechanism 75 is connected, the bottom drain pipe 73 and the overflow pipe 71 are connected to the waste liquid tank 74, the box blow pipe 303 is connected to the other side of the detection box 7, and the height of the box blow pipe 303 is not lower than that of the overflow pipe 71. The box blow pipe 303 and the overflow pipe 71 are arranged opposite to each other. The piston 304 is slidably connected inside the blowing main pipe 300. The piston 304 and the bottom sealing end of the blowing main pipe 300 are elastically connected by a spring 305. As the air supply kinetic energy of the blowing main pipe 300 gradually increases, the piston 304 gradually slides downward, and the liquid blow pipe 301, the ring blow pipe 302 and the box blow pipe 303 are opened in sequence.

[0048] Specifically, after the liquid cylinder 3 and coal cylinder 4 are fed, the air compressor supplies compressed air to the main air blowing pipe 300, with the power and kinetic energy of the air gradually increasing. First, the piston 304 slides below the liquid blowing pipe 301, and the airflow enters the liquid cylinder 3 through the liquid blowing pipe 301, cleaning the inner wall of the liquid cylinder 3. The liquid inside the liquid cylinder 3 and the transfer pipe 2 re-enters the mixing hopper 1 and, under the influence of the airflow, acts on the inner wall of the mixing hopper 1, located on the side below the horizontal rear port of the coal cylinder 4. A small portion of the clean coal remaining on the inner wall of the mixing hopper 1 flows downwards under the action of the liquid. As the air supply efficiency increases, the pressure inside the main air blowing pipe 300 gradually increases, and the piston 304 slides below the annular blowing pipe 302. The annular multiple airflow jets generated by the annular blowing pipe 302 act on the mixing hopper 1, causing the residue on the inner wall of the mixing hopper 1 to be centered towards the bottom. At this time, the valve below the mixing hopper 1 is opened, and the liquid is transported to the inside of the detection box 7 through the conveying mechanism 75 and the inlet pipe 72. The liquid level in the detection box 7 rises, and the overflow liquid enters the waste liquid tank 74 through the overflow pipe 71. The detector in the grayscale detector 200 detects the liquid at the same height through the concave part of the detection box 7 to obtain the analysis results until the liquid inside the mixing hopper 1 is emptied. The grayscale detector 200 closes the detection, the bottom drain pipe 73 is opened, and the piston 304 is located below the box blow pipe 303. The airflow generated by the ring blow pipe 302 acts on the front of the inside of the detection box 7 through the inlet pipe 72, and the box blow pipe 303 acts on the back of the inner wall of the detection box 7. This method cleans the inner column surface of the concave detection box 7 and removes the water film. The removed liquid is discharged to the waste liquid tank 74 for collection through the bottom drain pipe 73.

[0049] By coupling the gradually increasing air supply method with the short-stroke residue removal and long-stroke water film removal processes, the airflow intensity, start-up sequence, and functional purpose are linearly connected, simplifying the control method and facilitating continuous processing.

[0050] Additional explanation: The air supply duration of the liquid blow-out pipe 301, ring blow-out pipe 302, and box blow-out pipe 303 gradually increases. To ensure the stability of the piston 304's sliding, each of the liquid blow-out pipe 301, ring blow-out pipe 302, and box blow-out pipe 303 can be equipped with an independent valve. For example, when the valve of the liquid blow-out pipe 301 is closed, the ring blow-out pipe 302 exhausts air independently, which helps to increase the outlet gas kinetic energy. Similarly, when the liquid blow-out pipe 301 and ring blow-out pipe 302 are closed, the box blow-out pipe 303 exhausts air independently, which helps to increase the outlet gas kinetic energy.

[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coal ash content detection system using a slurry preparation method, comprising a mixing hopper (1), a liquid bottle (3), a coal trough (8), a weighing device (6), a computer (100), an ash content detector (200), and a liquid supply pipe (400), wherein the liquid supply pipe (400) injects liquid into the liquid bottle (3), the computer (100) obtains the solid-liquid weight in the liquid bottle (3) and the coal trough (8) through the weighing device (6), and when the solid-liquid ratio reaches a set range, controls the liquid and solid in the liquid bottle (3) and the coal trough (8) to enter the mixing hopper (1) for mixing, the mixed slurry enters the ash content detector (200) for detection, and the computer (100) obtains the results, characterized in that: The liquid bottle (3) is connected to the mixing hopper (1) through a transfer pipe (2), and a baffle plate (5) slides between the transfer pipe (2) and the liquid bottle (3) to block the liquid bottle (3) from dripping. The bottom of the coal trough (8) is provided with a flipping platform (81). The two plates of the flipping platform (81) are driven to rotate by a motor. The coal trough (8) is fixed on one plate, and the other plate is installed on the fixed surface by a weight sensor (82).

2. The coal ash content detection system based on the pulping method according to claim 1, characterized in that: The coal trough (8) is replaced with a coal cylinder (4). The weighing device (6) outside the coal cylinder (4) is controlled to rotate by a rotating component, and the rotation angle is not less than 90 degrees. The end of the coal cylinder (4) has an elastic membrane (42). When the coal cylinder (4) is vertical, the elastic membrane (42) is concave. When the coal cylinder (4) is horizontal, the elastic membrane (42) is flat.

3. The coal ash content detection system based on the pulping method according to claim 1, characterized in that: It also includes a blow pipe (300), which is connected from top to bottom to a liquid blow pipe (301), a ring blow pipe (302), and a box blow pipe (303). The liquid blow pipe (301) is located above the liquid bottle (3), the ring blow pipe (302) is located on the inner wall of the flared end of the mixing hopper (1) and is circular in shape, and the box blow pipe (303) extends into the grayscale detector (200).

4. The coal ash content detection system based on the pulping method according to claim 3, characterized in that: The grayscale detector (200) is equipped with a detection box (7). The cross-sectional shape of the detection box (7) is U-shaped. An overflow pipe (71), an inlet pipe (72), and a bottom drain pipe (73) are arranged sequentially from top to bottom on one side of the detection box (7). The mixing hopper (1) and the inlet pipe (72) are connected through a conveying mechanism (75). The bottom drain pipe (73) and the overflow pipe (71) are connected to the waste liquid tank (74). The box blow pipe (303) is connected to the other side of the detection box (7), and the height of the box blow pipe (303) is not lower than that of the overflow pipe (71). The box blow pipe (303) and the overflow pipe (71) are arranged opposite to each other.

5. The coal ash content detection system according to claim 2, characterized in that: The inside of the coal cylinder (4) is a rotating disk (41). A pull rod (43) is fixedly connected to the center of the bottom surface of the elastic membrane (42). The pull rod (43) slides vertically in the guide sleeve (44). The pull rod (43) is slidably connected to the rotating disk (41). The rotation axis of the rotating disk (41) is consistent with the rotation axis of the weighing device (6) outside the coal cylinder (4). When the coal cylinder (4) is in a vertical state, the counterweight block (411) fixed on the periphery of the rotating disk (41) is located at the bottom. The top of the arc of the groove (412) opened on the surface of the rotating disk (41) is located at the top. The bottom slider of the pull rod (43) is located at the arc of the groove (412).

6. The coal ash content detection system according to claim 3, characterized in that: A piston (304) is slidably connected inside the main air blowing pipe (300). The piston (304) is elastically connected to the bottom sealing end of the main air blowing pipe (300) by a spring (305). As the kinetic energy supplied by the main air blowing pipe (300) gradually increases, the piston (304) gradually slides downward, and the liquid blowing pipe (301), the ring blowing pipe (302), and the box blowing pipe (303) open in sequence.

7. The coal ash content detection system according to claim 1, characterized in that: The top surface of the baffle plate (5) has a "C"-shaped enclosure. The baffle plate (5) is tilted towards the opening side of the enclosure and completely covers the port of the transfer pipe (2). The baffle plate (5) is driven to move by a rotary driver (51). The sliding trajectory of the baffle plate (5) is an arc or a straight line.

8. The coal ash content detection system according to claim 1, characterized in that: The liquid bottle (3) has a drip hole at the bottom, and the drip hole is located above the baffle plate (5).

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