Full-automatic particle size grading preparation system and method for coarse particle coal slurry

Abstract

The invention discloses a full-automatic coarse particle coal slurry size grading preparation system which comprises a coarse particle coal size grading system, a material bin and a slurry preparation tank, the coarse-particle coal size grading system comprises a rotating disc and a fixed chassis, a driving device is arranged in the middle of the rotating disc; a plurality of through cavities are uniformly formed in the rotating disc in the surrounding direction; the fixed base plate is kept fixed and is provided with a plurality of through fixed open holes which can be overlapped with the cavity of the fixed base plate when the rotating disc rotates, and the different fixed open holes are internally provided with screens of which the screen hole specifications are sequentially increased; the material bins are fixed below the fixed open holes and communicated with the fixed open holes, each material bin is internally provided with an upper storage space and a lower storage space, and the lower storage space is communicated with the pulping tank; the invention further discloses a corresponding preparation method. Coal particles with different particle sizes are mixed according to a set mass ratio, so that accurate and rapid grading of the coal particle sizes is realized; the whole process from coal feeding, size grading to coal slurry preparation is automatically operated, labor is reduced, and production safety and reliability are improved.

Description

Technical Field

[0001] The present invention belongs to the field of coal slurry preparation, and more specifically, relates to a fully automatic coarse particle coal slurry particle size classification preparation system and method. Background Art

[0002] In the field of coal resource utilization and transportation, coarse-grained coal slurry has a specific application scenario in medium and short-distance coal transportation. The traditional water-coal slurry preparation technology used for gasification and combustion is relatively mature, but coarse-grained coal slurry is different from it, and its particle size distribution becomes a key technical difficulty in the preparation process.

[0003] In the existing coarse-grained coal slurry preparation process, the industry generally adopts a combination of fine crusher crushing and vibrating screen to control the particle size. Although this traditional process can screen and process the particle size of coal materials to a certain extent, it has significant limitations. It can only control the upper limit of the particle size of the material, and it is difficult to optimize the particle size distribution of coarse-grained coal slurry. Due to the lack of effective particle size distribution optimization methods, the transportation concentration and rheological characteristics of coarse-grained coal slurry during transportation cannot reach the ideal state, which directly has an adverse impact on the safety and economy of coarse-grained coal slurry transportation.

[0004] Under the current background of dual-carbon economy, pipeline coal transportation, as a coal transportation mode with important application value and broad development prospects, has put forward higher requirements on the quality and performance of coarse-grained coal slurry. Therefore, there is an urgent need for a new technology and new system that can effectively solve the problems of the existing coarse-grained coal slurry preparation process and equipment with single function, difficulty in optimizing coal slurry particle size distribution, and complex equipment operation, so as to promote the further development and widespread application of pipeline coal transportation technology and improve the utilization efficiency and economic benefits of coal resources in the medium and short-distance transportation links. Summary of the invention

[0005] The purpose of the present invention is to provide a new fully automatic system and method for pulping equipment and processes, so as to solve the limitations of the existing technical conditions, such as the single function of the coarse-particle coal slurry preparation process and equipment, the difficulty in optimizing the coal slurry particle size distribution, and the complex equipment operation, so as to help the industry move towards a more advanced and sustainable direction.

[0006] In view of the above defects or improvement needs of the prior art, according to the first aspect of the present invention, a fully automatic coarse particle coal slurry particle size classification preparation system is provided, comprising: a coarse particle coal particle size classification system, a material bin and a slurry tank;

[0007] The coarse coal particle size classification system comprises a rotating disk and a fixed chassis; the rotating disk is a disc-shaped structure, and a driving device for driving the rotating disk to rotate is arranged in the middle (the driving device comprises a spring disk rotating shaft and a variable speed motor); a plurality of through cavities are evenly arranged in the four directions around the rotating disk surrounding the driving device; the rotating disk is arranged on the top of the fixed chassis in a rotatable manner, and its radius is smaller than the fixed chassis;

[0008] The outermost end of the fixed chassis is provided with a mounting plate, and a grating positioner and an infrared sensor are installed above the mounting plate, and their heights are higher than the upper surface of the rotating disk; the fixed chassis remains fixed and is provided with a plurality of fixed openings that are through and can overlap with the cavity of the rotating disk when the rotating disk rotates, and screens with increasing sieve hole specifications are built into different fixed openings; the material bin is fixed below the fixed openings and connected to the fixed openings, and each material bin is provided with an upper and lower storage space inside, and a linkage switch for controlling the opening of the bottom of the upper storage space is provided at the bottom, and an electromagnetic bin wall vibrator for driving the bin body to vibrate is provided on the bin wall of the upper storage space; a mass sensing switch for controlling the opening of the bottom of the lower storage space is provided at the bottom, and after the mass sensing switch is turned on, the lower storage space is connected to the pulping tank;

[0009] The pulping tank is a hollow inner cavity tank body, with a built-in agitator, a quality sensor and an external clean water pipeline, and a discharge port is arranged at the bottom thereof.

[0010] Furthermore, a dust cover is provided on the upper part of the rotating disk, and a feed port is provided on one side of the dust cover and matched with a connected feed device.

[0011] Furthermore, the screen is a mesh structure with mesh holes, and after the electromagnetic bin wall vibrator is turned on, the electromagnetic bin wall vibrator drives the material bin and the screen to vibrate.

[0012] Furthermore, the external clean water pipeline and the discharge port are both water pipe structures provided with switch valves; one end of the external clean water pipeline is connected to the water source, and the other end penetrates the pulping tank body and extends into the tank body; the upper end of the discharge port is connected to the bottom end of the pulping tank.

[0013] Furthermore, the mounting plate includes a first mounting plate and a second mounting plate arranged at the other end of the fixed chassis; the first mounting plate and the second mounting plate are respectively connected to the grating positioner and the infrared sensor;

[0014] The built-in quality sensor is set at the bottom of the pulping tank, and the upper part receives the coal particles falling from the material bin.

[0015] Furthermore, the built-in agitator includes a stirring shaft, a stirring paddle and a driving motor, which is arranged above the bottom end of the pulping tank.

[0016] As another aspect of the present invention, it also relates to a fully automatic coarse particle coal slurry particle size classification preparation method, comprising the following steps:

[0017] S1 sets the coal slurry parameters through the control system and uses the grating positioner to position the rotating disk to determine its rotation direction and speed;

[0018] S2 delivers the coarse coal particles to the storage space formed by the rotating disk and the fixed bottom plate through the feeding device and moves with the rotation of the rotating disk;

[0019] After the S3 infrared sensor senses the material, it triggers the electromagnetic bin wall vibrator to start, causing the material bin to drive the screen to vibrate;

[0020] S4 screen aperture is designed with increasing diameter. The material falls into the corresponding material bin through the screen according to the diameter under the push of the rotating disk. The specific design of increasing screen aperture is as follows: the screen aperture increases in sequence in the clockwise direction. When the material is pushed to the screen, the small-diameter material first slides through the small-diameter screen to the corresponding material bin, and the large-diameter material slides to the subsequent material bin in sequence with the push of the rotating disk.

[0021] The linkage switch and quality sensing switch of the S5 material bin control the material to fall into the pulping tank according to the quality change of the bottom material; the specific working mode of the linkage switch and the quality sensing switch is: initially, the linkage switch in each particle size distribution material bin is turned on and the quality sensing switch is turned off, and the material falls from the upper layer of the material bin to the bottom layer of the material bin; when the quality of the bottom material reaches the set parameters, the linkage switch is turned off and the quality sensing switch is turned on.

[0022] S6 combines the built-in quality sensor data of the pulping tank, calculates the amount of clean water and opens the clean water pipeline, mixes the coal particles of different particle sizes that have been sorted in the material bin with clean water to make pulp, and discharges the material through the discharge port after completion.

[0023] Furthermore, in step S5, the mass sensing switch of the material bin is turned on to release the coal particles in the corresponding material bin into the slurry making tank according to the set mass ratio of coal particles of different particle sizes required for slurrying of coarse-grained coal slurry.

[0024] Furthermore, the method for calculating the amount of clean water in step S6 is: first determine the particle size distribution of the coal and the mass proportion of particles of each size, as well as the ambient temperature during the slurry making process. Specifically, the method calculates the required amount of clean water by comprehensively considering the effect of the particle size distribution, mass proportion and temperature of the coal on the viscosity of the coal slurry; the calculation formula is as follows:

[0025]

[0026] V water Indicates the required clean water volume, m coal Indicates the total mass of coal in the pulping tank, C slurryrepresents the predetermined coal slurry concentration, ρ water represents the density of water, T represents the ambient temperature, and f(T, particle size distribution) is a function that takes into account the effects of temperature and particle size distribution, and is used to adjust the amount of clean water to compensate for the effects of temperature changes and particle size distribution on the viscosity of coal slurry;

[0027] The function is defined as follows:

[0028]

[0029] Where: a, b, c and e are constants determined based on experimental data or empirical models, which are used to describe the effects of temperature and particle size distribution on coal slurry viscosity;

[0030] T is the ambient temperature, which is used to characterize the effect of temperature on the viscosity of coal slurry. A temperature sensor is set in the system;

[0031] w i is the mass proportion of particles in the i-th particle size interval;

[0032] d i is the representative particle size value of the i-th particle size interval;

[0033] n is the total number of particle size intervals;

[0034] is a weighted sum, which represents the comprehensive effect of particles of different sizes on the viscosity of coal slurry, where e is an index used to describe the degree of effect of particle size on the viscosity of coal slurry;

[0035] The constants a, b, c and e determined experimentally can make the function reflect the actual working conditions more accurately, thereby improving the accuracy of coal slurry preparation and the consistency of coal slurry quality.

[0036] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0037] 1. The fully automatic coarse-grained coal slurry particle size classification preparation system of the present invention adopts a particle size classification system including a rotating disk, a fixed chassis and a specific screen layout. The internal cavity of the rotating disk and the fixed chassis form a material storage space, which rotates under the drive of a variable speed motor, and cooperates with a screen with an increasing aperture in a clockwise direction. After the infrared sensor triggers vibration, the material falls into the corresponding material bin in order according to the diameter size, so that coal particles of different particle sizes are mixed at a set mass ratio, and the coal particle size is accurately and quickly classified, which effectively solves the problem that it is difficult to optimize the particle size distribution of coal slurry in traditional processes, and improves the quality stability and transportation performance of coarse-grained coal slurry.

[0038] 2. The fully automatic coarse-particle coal slurry particle size grading preparation system of the present invention adopts a layered design of the material bin, and a linkage switch and a quality sensing switch are respectively set on each layer, and the two switches are set in coordination; while performing graded storage of coal particles of different particle sizes, it can also release on demand according to the mass ratio of coal particles of different particle sizes required for the slurrying of coarse-particle coal slurry by opening and closing the mass sensing switch; the entire process from coal feeding, particle size grading to coal slurry preparation is automatically operated without excessive manual intervention, which greatly improves production efficiency, reduces labor costs, and at the same time improves the safety and reliability of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the three-dimensional structure of a rotating disk and a fixed chassis of a preferred embodiment of the present invention (in order to clearly express the structure, only one cavity, fixed opening, and screen is drawn);

[0041] Figure 3 A schematic diagram of the structure of a fixed chassis of a preferred embodiment of the present invention (in order to clearly express the structure, only one cavity, fixed opening, and screen is drawn);

[0042] Figure 4 This is a schematic diagram of the overall structure of a material bin in a preferred embodiment of the present invention;

[0043] In all the drawings, the same figure numbers represent the same technical features, specifically: 1-dust cover, 2-rotating disk, 21-cavity, 3-grating locator, 4-fixed chassis, 41-fixed opening, 5-mounting plate, 51-first mounting plate, 52-second mounting plate, 6-infrared sensor, 7-drum shaft, 8-speed motor, 9-screen, 10-material bin, 11-electromagnetic bin wall vibrator, 12-linkage switch, 13-quality sensing switch, 14-pulping tank, 15-agitator, 16-clean water pipeline, 17-quality sensor, 18-discharge port, 19-feeding device, 20-control system. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] Please refer to Figure 1 as well as Figure 2 , in order to achieve the above purpose, this embodiment 1 proposes a fully automatic coarse particle coal slurry particle size classification preparation system, including: a coarse particle coal particle size classification system, a material bin 10, and a slurry tank 14;

[0047] The coarse coal particle size classification system comprises a rotating disk 2 and a fixed base 4, wherein the rotating disk 2 is arranged above the fixed base 4 and has a radius smaller than the fixed base 4;

[0048] The rotating disk 2 is a disc-shaped structure with a certain thickness. The rotating disk can be cast in one piece using high-quality carbon steel to ensure a stable structure that can withstand the impact and friction of coal materials. The spring disk shaft is firmly welded in the middle, and the shaft is closely connected to a variable speed motor. The variable speed motor is equipped with an advanced variable frequency speed controller, which can accurately control the rotating disk speed to any value within a certain range to meet the differentiated requirements of coal particle turning rate under different working conditions. The variable speed motor is surrounded by the rotating disk, and multiple cavities of the same diameter are evenly distributed in a circle. The inner wall of the cavity is finely polished, which not only reduces the probability of material jamming, but also facilitates the smooth movement of the material.

[0049] As a preferred solution, in order to reduce environmental pollution, a dust cover 1 is provided on the upper part of the rotating disk 2. The dust cover is a high-strength transparent acrylic dust cover. A feed port is opened in the center of one side of the dust cover. The feed port is seamlessly connected to a high-power feeding belt conveyor through a flexible sealing pipe to prevent dust from escaping when coal is fed and maintain a clean working environment.

[0050] Please refer to Figure 3 The fixed chassis 4 is made of corrosion-resistant stainless steel plate and installed on a heavy-duty steel structure base to ensure that there is no shaking or displacement during the entire operation. The first mounting plate 51 and the second mounting plate 52 are welded at both ends of the circumferential area of ​​the fixed chassis. A grating locator 3 is set on the first mounting plate to identify the initial position of the rotating disk; an infrared sensor 6 is firmly installed on the second mounting plate to quickly capture the information of the material approaching. The fixed chassis 4 remains stationary, and a plurality of fixed openings are evenly arranged on the surface of the fixed chassis 4. Different fixed openings are built with screens of different specifications. The aperture specifications of the screens increase in sequence along the clockwise or counterclockwise direction. The fixed openings connect the material bin 10 with the cavity 21 inside the rotating disk 2. The screen is made of high-strength manganese steel and has excellent wear resistance and impact resistance, ensuring that it will not be damaged during long-term screening operations.

[0051] Specifically, the screen 9 is a planar mesh structure with mesh holes. After the electromagnetic bin wall vibrator 11 is turned on, the electromagnetic bin wall vibrator 11 drives the material bin 10 and the screen 9 to vibrate.

[0052] In some other embodiments, in order to improve the adaptability of the device to different types of coal, an improved fully automatic coarse particle coal slurry particle size classification preparation system is also provided, the device includes an adjustable screen system, the screen system is composed of a plurality of screens with different apertures, and these screens can be quickly replaced and adjusted according to the particle size and composition characteristics of the coal. Specifically, the screen system is designed as a modular structure, each module corresponds to a screen with a specific aperture, and can be quickly disassembled and installed through simple mechanical or hydraulic devices to adapt to the particle size distribution and physical properties of different coals.

[0053] Please refer to Figure 4 The material bin 10 is a rectangular or cylindrical structure with a hollow inner cavity, and is cleverly divided into two layers of storage space. An electromagnetic linkage switch is installed at the bottom of the upper storage space to quickly control the falling of materials; 4 electromagnetic bin wall vibrators are evenly inlaid around the bin wall to assist material screening and falling to avoid material blockage. A quality sensing switch is accurately installed at the bottom of the lower storage space to monitor the material quality in real time. It is accurately opened when the preset value is reached, so that the lower material falls smoothly into the pulping tank.

[0054] The slurry tank 14 is a hollow inner tank body. The tank body is made of special alloy steel that is acid-resistant, alkali-resistant and high-temperature-resistant. The inner wall of the tank body is lined with a polytetrafluoroethylene anti-stick coating to reduce the residue of coal slurry hanging on the wall. It has a built-in agitator 15, a quality sensor 17, an external clean water pipeline 16, and a discharge port 18 at its bottom.

[0055] Specifically, as a preferred solution, the agitator 15 includes a stirring shaft, a stirring paddle and a driving motor, which is arranged above the center of the bottom end of the pulping tank 14. The stirring shaft is made of stainless steel, and multiple sets of double-layer three-blade stirring paddles are evenly welded on the shaft in a spiral shape. The stirring paddle is made of high-strength wear-resistant alloy to ensure efficient and durable stirring, and is equipped with an intelligent speed control system to flexibly control the stirring speed.

[0056] An electric butterfly valve is connected in series on the external clean water pipeline 16 as a switch valve, and the butterfly valve has a quick response and good sealing performance;

[0057] Specifically, one end of the external clean water pipe 16 is connected to the water source, and the other end penetrates the body of the pulping tank 14, extends into the tank body and bends downward close to the bottom of the tank; the upper end of the discharge port 18 is connected to the bottom of the pulping tank 14. The bottom discharge port is equipped with a pneumatic knife gate valve, which is convenient for remote control and accurate control of coal slurry discharge.

[0058] As a preferred solution, a built-in quality sensor 17 is arranged at the bottom of the slurry tank 14, and the upper part receives the coal particles falling from the material bin 9. A high-precision quality sensor is installed in the center of the bottom of the tank to provide real-time feedback on the quality information of the material and coal slurry in the tank.

[0059] Example 2

[0060] This embodiment 2 proposes a fully automatic coarse coal slurry particle size classification preparation method, comprising:

[0061] Start-up preparation and parameter setting: The operator turns on the control system, and the interface displays a clear and intuitive equipment status monitoring and parameter setting section. According to the specific specifications of the coarse-grained coal slurry required for this production, the total mass of the coal slurry and the requirements for each particle size distribution are set. The preset value of the rotating disk speed and the vibration frequency of the electromagnetic silo wall vibrator are simultaneously input into the control system to lay the foundation for the upcoming production process. The grating positioner automatically locates and calibrates the rotating disk 2 to the standard starting position to ensure that the starting state of the material screening is consistent.

[0062] Feeding process: Start the feeding belt conveyor to continuously convey the coarse coal material that has been pre-crushed to a certain size to the feeding port of the rotating disk 2, and the material falls smoothly into the cavity of the rotating disk 2 along the sealed pipe. As the variable speed motor 8 drives the rotating disk to rotate at a constant speed, the material moves smoothly in the predetermined clockwise direction and gradually approaches the screen 9 area.

[0063] In some other embodiments, in some cases, the coal slurry material may accumulate, so it needs to be rotated forward and reversely appropriately. In this case, the number of forward and reverse revolutions of the rotating disk 2 can also be set, wherein the number of forward and reverse revolutions of the rotating disk 2 is performed in a predetermined ratio to achieve effective classification of the coal particles. Specifically, the rotating disk 2 first rotates forward for a specific number of revolutions at a predetermined speed, and then reverses for a specific number of revolutions at the same or different speeds. By periodically repeating the above forward and reverse processes, the dynamic classification of the coal particles on the rotating disk 2 is achieved. This method allows the number of forward and reverse revolutions and speeds to be dynamically adjusted according to the particle size distribution and mass proportion of the coal to optimize the classification effect. Through the method of the present invention, the residence time of the particles on the rotating disk 2 can be reduced, the fluidity of the particles can be improved, and thus the classification efficiency and uniformity can be improved.

[0064] Particle size screening trigger: When the infrared sensor 6 detects that the material is close to the screen, it immediately sends an electrical signal to the control system 20, and the control system 20 quickly instructs the electromagnetic bin wall vibrator 11 to start. Instantly, the material bin 10 vibrates with the high-frequency vibration of the electromagnetic bin wall vibrator 11, driving the built-in screen 9 to vibrate together, and the coal material starts the particle size screening process under the synergistic effect of the thrust of the rotating disk 2 and the vibration of the screen 9.

[0065] Accurate particle size classification: Following the increasing rule of the aperture of the screen 9, the coal particles with the smallest diameter first slide through the screen 9 with the smallest aperture to the upper layer of the corresponding material bin 10; the materials with diameters in other ranges then fall accurately into the corresponding bin, and so on, coal particles of different diameter ranges are returned to their bins, and the particle size is quickly and accurately classified in an orderly manner. During the entire classification process, the rotation speed of the rotating disk 2 and the frequency of the electromagnetic bin wall vibrator 11 remain stable to ensure the continuity and accuracy of the screening.

[0066] Material delivery control: After the material enters the material bin 10, the upper linkage switch 12 is initially turned on, and the material falls smoothly to the lower layer. The lower layer quality sensor switch 13 monitors the material stacking quality in real time. Once the quality of the lower layer material in a certain particle size bin reaches the value corresponding to the preset ratio, the linkage switch 12 is immediately closed, and the quality sensor switch 13 is turned on simultaneously. The material falls into the pulping tank 14 accurately and orderly, and is delivered in strict accordance with the established particle size ratio.

[0067] Pulping and discharging process: After the materials of each grade of particle size fall into the pulping tank 14 in sequence, the quality sensor 17 quickly collects the real-time quality information of the materials in the tank and transmits the data to the control system 20. The control system 20 calculates the required amount of clean water, and then automatically opens the electric butterfly valve of the clean water pipeline 16, and the clear water flows into the pulping tank 14 at a preset flow rate. Specifically, the method for calculating the amount of clean water is: first determine the particle size distribution of the coal and the mass proportion of particles of each size, as well as the ambient temperature during the pulping process. Specifically, this method calculates the required amount of clean water by comprehensively considering the influence of the particle size distribution, mass proportion and temperature of the coal on the viscosity of the coal slurry; the calculation formula is as follows:

[0068]

[0069] V water Indicates the required clean water volume, m coal Indicates the total mass of coal in the pulping tank, C slurry represents the predetermined coal slurry concentration, ρ water represents the density of water, T represents the ambient temperature, and f(T, particle size distribution) is a function that takes into account the effects of temperature and particle size distribution, and is used to adjust the amount of clean water to compensate for the effects of temperature changes and particle size distribution on the viscosity of coal slurry;

[0070] The function is defined as follows:

[0071]

[0072] Where: a, b, c and e are constants determined based on experimental data or empirical models, which are used to describe the effects of temperature and particle size distribution on coal slurry viscosity;

[0073] T is the ambient temperature, which is used to characterize the effect of temperature on the viscosity of coal slurry. A temperature sensor is set in the system;

[0074] w i is the mass proportion of particles in the i-th particle size interval;

[0075] d i is the representative particle size value of the i-th particle size interval;

[0076] n is the total number of particle size intervals;

[0077] is a weighted sum, which represents the comprehensive effect of particles of different sizes on the viscosity of coal slurry, where e is an index used to describe the degree of effect of particle size on the viscosity of coal slurry;

[0078] The constants a, b, c and e determined experimentally can make the function reflect the actual working conditions more accurately, thereby improving the accuracy of coal slurry preparation and the consistency of coal slurry quality.

[0079] At the same time, the agitator is started, and the driving motor drives the agitator shaft and the agitator paddle of the agitator 15 to rotate at a high speed, so that the material and the clean water are fully and evenly mixed and stirred, and after high-intensity stirring, a uniform and fine coarse-grained coal slurry with excellent rheological properties is made. Finally, the pneumatic knife gate valve at the discharge port 18 is controlled, and the coal slurry is discharged stably according to the required flow rate, completing the entire preparation process.

[0080] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully automatic coarse coal slurry particle size classification preparation system, characterized in that: include: A coarse coal particle size classification system, a material bin (10) and a pulping tank (14); The coarse coal particle size classification system comprises a rotating disk (2) and a fixed chassis (4); the rotating disk (2) is a disc-shaped structure, and a driving device for driving the rotating disk (2) to rotate is arranged in the middle; a plurality of through cavities (21) are evenly arranged around the rotating disk (2) in the surrounding directions around the driving device; the rotating disk (2) is arranged on the top of the fixed chassis (4) in a rotatable manner, and its radius is smaller than that of the fixed chassis (4); a mounting plate (5) is arranged at the outermost end of the fixed chassis (4), and a grating positioner (3) and an infrared sensor (6) are arranged on the top of the mounting plate (5), and their heights are higher than the upper surface of the rotating disk (2); the fixed chassis (4) remains fixed and is provided with a plurality of through fixed openings (41) that can overlap with the cavities of the rotating disk (2) when the rotating disk (2) rotates, and screens (9) with increasing sieve hole specifications are built into different fixed openings (41); The material bin (10) is fixed below the fixed opening (41) and is in communication with the fixed opening (41). Each material bin (10) is provided with an upper and lower material storage space. A linkage switch (12) for controlling the opening of the bottom of the upper material storage space is provided at the bottom of the upper material storage space. An electromagnetic bin wall vibrator (11) for driving the bin body to vibrate is provided on the bin wall of the upper material storage space. A mass sensing switch (13) for controlling the opening of the bottom of the lower material storage space is provided at the bottom of the lower material storage space. When the mass sensing switch is turned on, the lower material storage space is connected to the pulping tank (14). The pulping tank (14) is a hollow inner tank body, with a built-in stirrer (15), a quality sensor (17) and an external clean water pipeline (16), and a discharge port (18) is arranged at the bottom thereof.

2. The fully automatic coarse coal slurry particle size classification preparation system according to claim 1 is characterized by: A dust cover (1) is arranged on the upper part of the rotating disk (2), and a feed port is arranged on one side of the dust cover (1) and matched with a connected feed device (19).

3. The fully automatic coarse coal slurry particle size classification preparation system according to claim 1, characterized in that: The screen (9) is a mesh structure with mesh holes. When the electromagnetic bin wall vibrator (11) is turned on, the electromagnetic bin wall vibrator (11) drives the material bin (10) and the screen (9) to vibrate.

4. The fully automatic coarse coal slurry particle size classification preparation system according to claim 1, characterized in that: The external clean water pipeline (16) and the discharge port (18) are both water pipe structures provided with a switch valve; one end of the external clean water pipeline (16) is connected to a water source, and the other end penetrates the tank body of the pulping tank (14) and extends into the tank body; the upper end of the discharge port (18) is connected to the bottom end of the pulping tank (14).

5. The fully automatic coarse coal slurry particle size classification preparation system according to claim 1, characterized in that: The mounting plate comprises a first mounting plate (51) and a second mounting plate (52) arranged at the other end of the fixed chassis (4); the first mounting plate (51) and the second mounting plate (52) are respectively connected to the grating positioner (3) and the infrared sensor (6).

6. A fully automatic coarse coal slurry particle size classification preparation system according to any one of claims 1 to 5, characterized in that: The built-in agitator (15) comprises a stirring shaft, a stirring paddle and a driving motor, and is arranged above the bottom end of the pulping tank (14).

7. A fully automatic coarse coal slurry particle size classification preparation method, characterized in that: include: S1. The coal slurry parameters are set by the control system (20) and the grating positioner (3) is used to position the rotating disk (2) to determine the direction and speed of rotation; S2. The coarse coal material is delivered to the storage space formed by the rotating disk (2) and the fixed chassis (4) through the feeding device (19) and moves with the rotation of the rotating disk; S3. After the infrared sensor (6) senses the material, it triggers the electromagnetic bin wall vibrator (11) to turn on the material bin (10) to drive the screen (9) to vibrate; S4. The aperture of the screen (9) is designed to increase in size. The material falls into the corresponding material bin through the screen (9) according to the diameter under the push of the rotating disk (2); the aperture of the screen (9) is designed to increase in size in a clockwise direction. When the material is pushed to the screen (9), the small-diameter material first slides through the small-diameter screen (9) to the corresponding material bin (10), and the large-diameter material slides to the subsequent material bin (10) in sequence with the push of the rotating disk (2); S5. The linkage switch (12) and the quality sensing switch (13) of the material bin (10) control the material to fall into the pulping tank (14) according to the change of the quality of the bottom material; the specific working mode of the linkage switch (12) and the quality sensing switch (13) is as follows: initially, the linkage switch (12) in each particle size distribution material bin (10) is turned on and the quality sensing switch (13) is turned off, and the material falls from the upper layer of the material bin 10 to the bottom layer of the material bin 10; when the quality of the bottom material reaches the set parameter, the linkage switch (12) is turned off and the quality sensing switch (13) is turned on; S6. The amount of clean water is calculated based on the built-in mass sensor (17) of the pulping tank (14) and the clean water pipeline (16) is opened to mix the coal particles of different particle sizes that have been classified and released through the material bin (10) with clean water to make pulp. After completion, the coal particles are discharged through the discharge port (18).

8. A fully automatic coarse coal slurry particle size classification preparation method according to claim 7, characterized in that: In step S5, the mass sensing switch (13) of the material bin (10) is turned on to release the coal particles in the corresponding material bin (10) into the slurry tank (14) according to the set mass ratio of coal particles of different particle sizes required for slurrying of coarse-grained coal slurry.

9. A fully automatic coarse coal slurry particle size classification preparation method according to claim 7, characterized in that: The method for calculating the amount of clean water in step S6 is: first determine the particle size distribution of the coal and the mass proportion of particles of each size, as well as the ambient temperature during the slurry making process; specifically, the method calculates the required amount of clean water by comprehensively considering the particle size distribution of the coal, the mass proportion and the influence of temperature on the viscosity of the coal slurry; the calculation formula is as follows: V water Indicates the required clean water volume, m coal Indicates the total mass of coal in the pulping tank, C slurry represents the predetermined coal slurry concentration, ρ water represents the density of water, T represents the ambient temperature, and f(T, particle size distribution) is a function that takes into account the effects of temperature and particle size distribution and is used to adjust the amount of clean water to compensate for the effects of temperature changes and particle size distribution on the viscosity of coal slurry; The function is defined as follows: Where: a, b, c and e are constants determined based on experimental data or empirical models, which are used to describe the effects of temperature and particle size distribution on coal slurry viscosity; T is the ambient temperature, which is used to characterize the effect of temperature on the viscosity of coal slurry. A temperature sensor is set in the system; w i is the mass proportion of particles in the i-th particle size interval; d i is the representative particle size value of the i-th particle size interval; n is the total number of particle size intervals; is a weighted sum, which represents the comprehensive effect of particles of different sizes on the viscosity of coal slurry, where e is an index used to describe the degree of effect of particle size on the viscosity of coal slurry; The constants a, b, c and e determined experimentally can make the function reflect the actual working conditions more accurately, thereby improving the accuracy of coal slurry preparation and the consistency of coal slurry quality.

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