Coal preparation plant coal slime water rough running detection device

Abstract

The utility model relates to the technical field of coarse detection, and provides a coal preparation plant slime water coarse detection device, which is characterized by comprising a cylinder body, a filter plate, a water inlet electromagnetic valve and a liquid level sensor, the filter plate is arranged in the cylinder body, and the interior of the cylinder body is divided into an upper liquid inlet cavity and a lower liquid outlet cavity; the water inlet electromagnetic valve is arranged outside the barrel, and the outlet end of the water inlet electromagnetic valve is communicated with the upper liquid inlet cavity; the liquid level sensor is arranged on the barrel, the detection end of the liquid level sensor is located in the upper liquid inlet cavity, and the liquid level sensor is electrically connected with the water inlet electromagnetic valve and used for controlling the on-off state of the water inlet electromagnetic valve. According to the technical scheme, the problem that a detection device capable of timely discovering the rough thickness deviation phenomenon is urgently needed in the related technology is solved.

Description

Technical Field

[0001] This utility model relates to the field of coarse coal runoff detection technology, specifically to a coarse coal runoff detection device for coal preparation plants. Background Technology

[0002] In the coal washing process of a coal preparation plant, when the screen plate falls, the screen bar breaks or wears too wide, or the screen basket wears too wide, large pieces or coarse particles of material will enter the feed hopper. This is called coarse material run-out. If it is not detected in time, the coarse particles will continue to accumulate, which may eventually lead to pipeline blockage, filter cloth damage, or even large-scale system shutdown. Therefore, there is an urgent need for a detection device that can detect coarse material run-out in a timely manner. Utility Model Content

[0003] This utility model proposes a detection device for coarse coal runoff in coal preparation plants, which solves the problem of the urgent need in related technologies for a detection device that can detect coarse coal runoff in a timely manner.

[0004] The technical solution of this utility model is as follows: A coal preparation plant coal slurry coarseness detection device, the key feature of which is: including,

[0005] cylindrical body

[0006] A filter plate is disposed inside the cylinder, dividing the interior of the cylinder into an upper liquid inlet chamber and a lower liquid outlet chamber.

[0007] A water inlet solenoid valve is disposed outside the cylinder, and the outlet end of the water inlet solenoid valve is connected to the upper liquid inlet chamber.

[0008] A liquid level sensor is installed on the cylinder body, with its detection end located inside the upper liquid inlet chamber. The liquid level sensor is electrically connected to the water inlet solenoid valve and is used to control the on / off state of the water inlet solenoid valve.

[0009] Furthermore, it also includes a vibration motor, which is mounted on the cylinder and located outside the cylinder. The liquid level sensor is electrically connected to the controlled end of the vibration motor and is used to control the on / off state of the vibration motor.

[0010] Furthermore, it also includes,

[0011] An upper cone, the lower end of which is connected to the upper end of the cylinder, and the diameter of the upper cone gradually decreases from bottom to top;

[0012] An upper mounting flange is provided at the upper end of the upper cone.

[0013] Furthermore, it also includes,

[0014] The lower cone has its upper end connected to the lower end of the cylinder, and the diameter of the lower cone gradually decreases from top to bottom.

[0015] A lower mounting flange is provided at the lower end of the lower cone.

[0016] Furthermore, the side wall of the cylinder has an observation port and also includes a transparent observation window, which is relatively sealed at the observation port.

[0017] Furthermore, the width of the observation port is greater than or equal to the diameter of the filter plate, and the device also includes an observation cylinder with an inner diameter greater than or equal to the diameter of the filter plate. One end of the observation cylinder is located at the observation port and is simultaneously connected to the upper liquid inlet chamber and the lower liquid outlet chamber. The transparent observation window is located at the other end of the observation cylinder, and the transparent observation window and the observation cylinder are detachably connected. The filter plate and the cylinder are also detachably connected.

[0018] Furthermore, it also includes support members, with support members on both sides of the filter plate. The support members are connected to the cylinder and / or the observation cylinder, and the filter plate is placed between the support members on both sides.

[0019] Furthermore, it also includes a sealing ring, which is disposed on the transparent observation window and located on the side of the transparent observation window facing the observation tube, and the observation tube is inserted into the sealing ring.

[0020] Furthermore, it also includes,

[0021] A connecting ring is disposed around the periphery of the observation tube and located at the end of the observation tube closest to the transparent observation window;

[0022] A locking bolt having a threaded rod and a nut, the threaded rod of the locking bolt being inserted into the connecting ring and the transparent observation window;

[0023] A locking nut is threadedly connected to the screw of the locking bolt, and the transparent observation window and the connecting ring are clamped between the nut of the locking bolt and the locking nut.

[0024] Furthermore, the transparent viewing window has a recessed groove, and the nut of the locking bolt is located within the recessed groove.

[0025] The working principle and beneficial effects of this utility model are as follows: the filter plate is set inside the cylinder, dividing the inside of the cylinder into an upper liquid inlet chamber and a lower liquid outlet chamber; the water inlet solenoid valve is set outside the cylinder, and the outlet end of the water inlet solenoid valve is connected to the upper liquid inlet chamber; the liquid level sensor is set on the cylinder, and the detection end of the liquid level sensor is located inside the upper liquid inlet chamber. The liquid level sensor is electrically connected to the water inlet solenoid valve and is used to control the opening and closing state of the water inlet solenoid valve.

[0026] The upper and lower ends of the cylinder are connected to the closed coal slurry water pipeline, and the inlet of the water inlet solenoid valve is connected to the water delivery equipment. When the washing system is operating normally and there is no coarse particle runoff, the liquid entering the upper inlet chamber is mainly fine-particle coal slurry water that has undergone normal screening. Due to the small particle size, it can pass through the filter plates inside the cylinder without obstruction, smoothly flow into the lower outlet chamber, and exit the cylinder, returning to the closed coal slurry water pipeline. The liquid flow is stable throughout the process. At this time, the liquid level in the upper inlet chamber is relatively low. The liquid level sensor monitors the liquid level in real time. Since the condition for triggering the opening of the water inlet solenoid valve has not been met, the water inlet solenoid valve remains closed, and the system operates normally according to the established procedure.

[0027] When the liquid level in the upper inlet chamber reaches the set maximum value, it indicates that the filter plate is clogged. The liquid level sensor sends an alarm signal and triggers the inlet solenoid valve, causing it to open. Water from the water supply equipment enters the cylinder to flush the filter plate, washing away the clogged material into coal slurry. This slurry then passes through the filter plate and is discharged into the lower outlet chamber, returning to the closed coal slurry pipeline. The liquid level in the upper inlet chamber drops rapidly. When the liquid level reaches the set minimum value, the liquid level sensor stops sending alarm signals and closes the inlet solenoid valve, restoring the system to normal operation. If the alarm signal persists for an extended period, it indicates coarse material buildup. Large pieces or coarse particles that have not been effectively screened accumulate on the filter plate, and water flushing alone cannot clean it. This alerts the operator to take timely and effective measures.

[0028] By precisely monitoring the liquid level in the upper inlet chamber using a liquid level sensor, a clear alarm signal is quickly issued once the liquid level abnormally rises to the alarm threshold. Both on-site operators and remote monitoring systems can immediately detect the coarse particle runoff, gaining valuable time for timely intervention and effectively preventing the potential for large-scale accumulation of coarse particles due to delayed detection. When filter plate blockage is detected, the device does not rely solely on manual intervention. Instead, it automatically activates the water flow through the linkage between the inlet solenoid valve and the water supply equipment, flushing the filter plates and promptly clearing the blockage. This allows the system to quickly return to normal filtration, significantly reducing the workload of manual inspection and cleaning, and improving production efficiency. It effectively prevents a series of chain reactions caused by coarse particle runoff, such as pipeline blockage and filter cloth damage, ensuring the continuous and stable operation of the coal washing system in the coal preparation plant. This reduces equipment maintenance costs and production losses caused by large-scale system shutdowns. Attached Figure Description

[0029] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0030] Figure 1 This is the front view of the present invention.

[0031] Figure 2 This is the right view of the present invention.

[0032] Figure 3 This is a front view of the connection between the filter plate, the cylinder, and the observation cylinder in this utility model.

[0033] Figure 4 This is a top view showing the connection between the filter plate, the cylinder, and the observation cylinder in this utility model.

[0034] In the diagram: 1. Cylinder, 2. Filter plate, 3. Inlet solenoid valve, 4. Liquid level sensor, 5. Vibration motor, 6. Upper cone, 7. Upper mounting flange, 8. Lower cone, 9. Lower mounting flange, 10. Observation port, 11. Transparent observation window, 12. Observation cylinder, 13. Support component, 14. Sealing ring, 15. Connecting ring, 16. Locking bolt, 17. Locking nut, 18. Settling tank. Detailed Implementation

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0036] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0037] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Example, refer to Figures 1-4 As an embodiment of this utility model, a coal slurry water coarseness detection device for a coal preparation plant is proposed, including a cylinder 1, a filter plate 2, a water inlet solenoid valve 3, and a liquid level sensor 4. The filter plate 2 is disposed inside the cylinder 1, dividing the interior of the cylinder 1 into an upper liquid inlet chamber and a lower liquid outlet chamber. The water inlet solenoid valve 3 is disposed outside the cylinder 1, and its outlet end is connected to the upper liquid inlet chamber. The liquid level sensor 4 is disposed on the cylinder 1, and its detection end is located inside the upper liquid inlet chamber. The liquid level sensor 4 is electrically connected to the water inlet solenoid valve 3 and is used to control the on / off state of the water inlet solenoid valve 3.

[0040] In this embodiment, both the upper and lower ends of the cylinder 1 are connected to a closed coal slurry water pipeline, and the inlet of the water inlet solenoid valve 3 is connected to a water delivery device. When the washing system is operating normally and there is no coarse particle runoff, the liquid entering the upper inlet chamber is mainly fine-particle coal slurry water that has undergone normal screening. Due to the small size of the particles, they can pass through the filter plate 2 set inside the cylinder 1 without obstruction, flow smoothly into the lower outlet chamber, and exit the cylinder 1, returning to the closed coal slurry water pipeline. The liquid flow is stable throughout the process. At this time, the liquid level in the upper inlet chamber is relatively low. The liquid level sensor 4 monitors the liquid level in real time. The conditions for triggering the opening of the water inlet solenoid valve 3 have not been met, so the water inlet solenoid valve 3 remains closed, and the system operates normally according to the predetermined process.

[0041] When the liquid level in the upper inlet chamber reaches the set maximum value, it indicates that filter plate 2 is blocked. The liquid level sensor 4 sends an alarm signal and triggers the water inlet solenoid valve 3, causing it to open. Water from the water supply equipment enters the cylinder 1 to flush the filter plate 2, causing the material blocking the filter plate 2 to be flushed into coal slurry water, which then flows through the filter plate 2 into the lower outlet chamber and returns to the closed coal slurry water pipeline. The liquid level in the upper inlet chamber drops rapidly. When the liquid level reaches the set minimum value, the liquid level sensor 4 stops sending alarm signals and closes the water inlet solenoid valve 3, restoring the system to normal operation. If the alarm signal persists for an extended period, such as after 30 seconds, it indicates that coarse material has accumulated on the filter plate 2. Large pieces or coarse particles that have not been effectively screened cannot be cleaned by water alone. This should alert the operator to take timely and effective measures.

[0042] By accurately monitoring the liquid level in the upper inlet chamber using the liquid level sensor 4, a clear alarm signal is quickly issued once the liquid level abnormally rises to the alarm threshold. Both on-site operators and remote monitoring systems can immediately detect the coarse material runoff, gaining valuable time for timely handling and effectively preventing the potential for large-scale accumulation of coarse particles due to delayed detection. When filter plate 2 is detected to be clogged, the device does not rely solely on manual intervention. Instead, it automatically opens the water flow to flush filter plate 2 through the linkage of the inlet solenoid valve 3 and the water supply equipment, promptly clearing the material clogging the filter plate 2 and quickly restoring the system to normal filtration status. This significantly reduces the workload of manual inspection and cleaning, improving production efficiency. It effectively prevents a series of chain problems caused by coarse material runoff, such as pipeline blockage and filter cloth damage, ensuring the continuous and stable operation of the coal washing system in the coal preparation plant. This reduces equipment maintenance costs and production losses caused by large-scale system shutdowns.

[0043] Furthermore, such as Figure 2 As shown, it also includes a vibration motor 5, which is mounted on the cylinder 1 and located outside the cylinder 1. The liquid level sensor 4 is electrically connected to the controlled end of the vibration motor 5 and is used to control the switching state of the vibration motor 5.

[0044] When coarse material flow occurs, and the level sensor 4 detects an abnormal rise in the liquid level in the upper inlet chamber reaching the set maximum value, it not only triggers the water inlet solenoid valve 3 to open and flush the material, but also simultaneously sends a start signal to the vibration motor 5. The vibration motor 5 operates, generating vibration that is transmitted to the cylinder 1 and filter plate 2. This vibration helps to further loosen large pieces or coarse particles accumulated on the filter plate 2, making them easier to be dispersed and broken into fine particles of coal slurry by the subsequent water flow, thus accelerating the process of cleaning the clogged filter plate 2. The vibration motor 5 and the cylinder 1 are detachably connected, facilitating disassembly and maintenance.

[0045] Furthermore, such as Figure 1 and Figure 2 As shown, it also includes an upper cone 6 and an upper mounting flange 7. The lower end of the upper cone 6 is connected to the upper end of the cylinder 1, and the diameter of the upper cone 6 gradually decreases from bottom to top. The upper mounting flange 7 is located at the upper end of the upper cone 6. The diameter of the upper cone 6 gradually decreases from bottom to top, and its special shape design conforms to the principles of fluid mechanics. During the process of coal slurry flowing into the upper inlet chamber of the cylinder 1, the upper cone 6 plays a guiding role, allowing the coal slurry to be more evenly distributed above the upper inlet chamber. This avoids excessive local impact on the filter plate 2 caused by concentrated flow direction or uneven flow velocity, which helps the filter plate 2 maintain a stable working state, reduces the risk of damage to the filter plate 2 due to uneven stress, and extends the service life of the filter plate 2. The upper mounting flange 7 facilitates the connection between the upper cone 6 and the closed pipeline of coal slurry, which can reduce the installation difficulty, improve the installation efficiency, better ensure the sealing performance, and prevent coal slurry leakage. The connection between the upper cone 6 and the cylinder 1 is detachable, which is convenient for disassembly and maintenance.

[0046] Furthermore, such as Figure 1 and Figure 2 As shown, it also includes a lower cone 8 and a lower mounting flange 9. The upper end of the lower cone 8 is connected to the lower end of the cylinder 1, and the diameter of the lower cone 8 gradually decreases from top to bottom. The lower mounting flange 9 is located at the lower end of the lower cone 8. The gradually decreasing diameter of the lower cone 8 allows the fine-particle coal slurry water, filtered by the filter plate 2, to flow into the lower discharge chamber, where it acts as a converging point, guiding the liquid to flow more smoothly and centrally out of the cylinder 1, preventing liquid residue or turbulence within the cylinder 1. The lower mounting flange 9 facilitates the connection between the lower cone 8 and the closed coal slurry water pipeline, reducing installation difficulty, improving installation efficiency, better ensuring sealing, and preventing coal slurry water leakage. The connection between the lower cone 8 and the cylinder 1 is detachable, facilitating disassembly and maintenance.

[0047] Furthermore, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the side wall of the cylinder 1 has an observation port 10, and also includes a transparent observation window 11, which is relatively sealed at the observation port 10. By opening the observation port 10 on the side wall of the cylinder 1 and installing the transparent observation window 11 in a relatively sealed manner, the visibility provided by the transparent material offers a direct and convenient observation method. Without disassembling the device, staff can easily check the general condition inside the cylinder 1 during daily inspections or equipment operation, such as the coal slurry water level, whether there is abnormal foam or floating debris, etc., which helps to promptly identify potential problems and ensure the stable operation of the device.

[0048] Furthermore, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the width of the observation port 10 is greater than or equal to the diameter of the filter plate 2, and it also includes an observation cylinder 12. The inner diameter of the observation cylinder 12 is greater than or equal to the diameter of the filter plate 2. One end of the observation cylinder 12 is located at the observation port 10 and is simultaneously connected to the upper liquid inlet chamber and the lower liquid outlet chamber. The transparent observation window 11 is located at the other end of the observation cylinder 12. The transparent observation window 11 and the observation cylinder 12 are detachably connected. The filter plate 2 and the cylinder 1 are detachably connected.

[0049] The observation cylinder 12 connects both the upper inlet chamber and the lower outlet chamber, allowing operators to observe not only the filter plate 2 but also the flow status of the coal slurry water within the two chambers, including whether there is any blockage and whether the flow rate is normal. When the filter plate 2 needs cleaning, replacement, or maintenance, the transparent observation window 11 can be removed from the observation cylinder 12, allowing the filter plate 2 inside the cylinder 1 to be pulled out from the observation cylinder 12. After the filter plate 2 is installed, the transparent observation window 11 can be reinstalled onto the observation cylinder 12, facilitating the disassembly and maintenance of the filter plate 2.

[0050] Furthermore, such as Figure 2 , Figure 3 and Figure 4 As shown, the filter plate 2 also includes support members 13. Support members 13 are located on both sides of the filter plate 2, and are connected to the cylinder 1 and / or the observation cylinder 12. The filter plate 2 rests between the support members 13 on both sides. The support members 13 on both sides are connected to the cylinder 1 and the observation cylinder 12, providing stable support for the filter plate 2. When the filter plate 2 needs cleaning, replacement, or maintenance, workers can quickly and easily disassemble it without complex tools or extensive disassembly of surrounding components. This reduces the maintenance difficulty and time cost of the filter plate 2, improves the daily operation and maintenance efficiency of the coal preparation plant, and reduces downtime caused by maintenance.

[0051] Furthermore, such as Figure 3 and Figure 4 As shown, it also includes a sealing ring 14, which is set on the transparent observation window 11 and located on the side of the transparent observation window 11 facing the observation cylinder 12. The observation cylinder 12 and the sealing ring 14 are inserted into each other to form an effective seal, which can still prevent coal slurry water leakage under working conditions such as coal slurry water pressure and equipment operation vibration.

[0052] Furthermore, such as Figure 3 and Figure 4 As shown, it also includes a connecting ring 15, a locking bolt 16, and a locking nut 17. The connecting ring 15 is disposed around the observation cylinder 12 and located at one end of the observation cylinder 12 near the transparent observation window 11. The locking bolt 16 has a screw and a nut. The screw of the locking bolt 16 is inserted into the connecting ring 15 and the transparent observation window 11. The locking nut 17 is threadedly connected to the screw of the locking bolt 16. The transparent observation window 11 and the connecting ring 15 are clamped between the nut of the locking bolt 16 and the locking nut 17.

[0053] The connecting ring 15 is located at the end of the observation cylinder 12 near the transparent observation window 11, providing a basic support structure for subsequent fixing. The locking bolt 16 and locking nut 17 cooperate to tightly clamp the transparent observation window 11 and the connecting ring 15 between the nut of the locking bolt 16 and the locking nut 17. Mechanical tightening ensures that the transparent observation window 11 is firmly fixed and will not loosen or shift due to equipment vibration, coal slurry impact, or other factors. This ensures that the transparent observation window remains in its original position in the complex and harsh working environment of the coal preparation plant, without affecting the observation effect. It allows operators to clearly observe the inside of the device at any time, laying the foundation for timely detection and handling of problems. Moreover, this connection structure is strong and reliable, and easy and quick to assemble and disassemble, saving time and effort.

[0054] Furthermore, such as Figure 3 As shown, the transparent observation window 11 has a recess 18, and the nut of the locking bolt 16 is located in the recess 18. After installation, the nut of the locking bolt 16 is sunk into the recess 18, basically flush with or slightly lower than the surface of the transparent observation window 11. This prevents the nut from protruding from the surface of the transparent observation window 11, thus preventing it from scratching the staff's clothing, tools, etc., during daily inspections, cleaning of the transparent observation window 11, or other operations, causing inconvenience or damage. At the same time, it also reduces the risk of the nut loosening due to collisions with external objects, further improving the stability of the transparent observation window 11 and ensuring the safe operation of the device.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for detecting coarse coal slurry leakage in a coal preparation plant, characterized in that: include, Cylinder (1) Filter plate (2), the filter plate (2) is disposed inside the cylinder (1) and divides the inside of the cylinder (1) into an upper liquid inlet chamber and a lower liquid outlet chamber; Water inlet solenoid valve (3), the water inlet solenoid valve (3) is disposed outside the cylinder (1), and the outlet end of the water inlet solenoid valve (3) is connected to the upper liquid inlet chamber; A liquid level sensor (4) is installed on the cylinder (1). The detection end of the liquid level sensor (4) is located in the upper liquid inlet chamber. The liquid level sensor (4) is electrically connected to the water inlet solenoid valve (3) and is used to control the on / off state of the water inlet solenoid valve (3).

2. The coal slurry water coarseness detection device for a coal preparation plant according to claim 1, characterized in that: It also includes a vibration motor (5), which is mounted on the cylinder (1) and located outside the cylinder (1). The liquid level sensor (4) is electrically connected to the controlled end of the vibration motor (5) and is used to control the switching state of the vibration motor (5).

3. The coal slurry water coarseness detection device for a coal preparation plant according to claim 1, characterized in that: It also includes, The upper cone (6) has its lower end connected to the upper end of the cylinder (1), and the diameter of the upper cone (6) gradually decreases from bottom to top. Upper mounting flange (7) is located at the upper end of the upper cone (6).

4. The coal slurry water coarseness detection device for a coal preparation plant according to claim 1, characterized in that: It also includes, The lower cone (8) is connected to the lower end of the cylinder (1) at its upper end, and the diameter of the lower cone (8) gradually decreases from top to bottom. The lower mounting flange (9) is located at the lower end of the lower cone (8).

5. The coal slurry water coarseness detection device for a coal preparation plant according to claim 1, characterized in that: The cylinder (1) has an observation port (10) on its side wall and also includes a transparent observation window (11), which is relatively sealed at the observation port (10).

6. The coal slurry water coarseness detection device for a coal preparation plant according to claim 5, characterized in that: The width of the observation port (10) is greater than or equal to the diameter of the filter plate (2), and it also includes an observation cylinder (12). The inner diameter of the observation cylinder (12) is greater than or equal to the diameter of the filter plate (2). One end of the observation cylinder (12) is located at the observation port (10) and is simultaneously connected to the upper liquid inlet chamber and the lower liquid outlet chamber. The transparent observation window (11) is located at the other end of the observation cylinder (12). The transparent observation window (11) and the observation cylinder (12) are detachably connected. The filter plate (2) and the cylinder (1) are detachably connected.

7. The coal slurry water coarseness detection device for a coal preparation plant according to claim 6, characterized in that: It also includes support members (13), which are located on both sides of the filter plate (2). The support members (13) are connected to the cylinder (1) and / or the observation cylinder (12). The filter plate (2) is placed between the support members (13) on both sides.

8. The coal slurry water coarseness detection device for a coal preparation plant according to claim 6, characterized in that: It also includes a sealing ring (14), which is disposed on the transparent observation window (11) and located on the side of the transparent observation window (11) facing the observation tube (12), and the observation tube (12) is inserted into the sealing ring (14).

9. A coal preparation plant coal slurry water coarseness detection device according to claim 6, characterized in that: It also includes, A connecting ring (15) is disposed around the observation tube (12) and located at one end of the observation tube (12) near the transparent observation window (11); A locking bolt (16) having a screw and a nut, the screw of the locking bolt (16) being inserted into the connecting ring (15) and the transparent observation window (11); A locking nut (17) is threadedly connected to the screw of the locking bolt (16), and the transparent observation window (11) and the connecting ring (15) are clamped between the nut of the locking bolt (16) and the locking nut (17).

10. A coal preparation plant coal slurry water coarseness detection device according to claim 9, characterized in that: The transparent viewing window (11) has a recess (18), and the nut of the locking bolt (16) is located in the recess (18).

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