Coal preparation device

Abstract

The invention relates to the technical field of coal deep processing equipment, and particularly discloses a coal preparation device which comprises coal receiving equipment, pre-crushing equipment, a coal distributing mechanism, a coal blending bin, coal blending crushing equipment and a coal tower which are sequentially arranged along a production process, and materials are conveyed among the equipment through belt conveyors; the coal receiving equipment comprises a coal receiving pit and a coal feeder arranged below the coal receiving pit; the coal distributing mechanism comprises a first coal distributing mechanism which is arranged in front of the pre-crushing equipment and is used for conveying coal types which do not need to be pre-crushed to the coal blending bin; the second coal distributing mechanism is arranged behind the pre-crushing equipment and is used for conveying the pre-crushed coal types to the coal blending bin; the plurality of coal blending bunkers are used for respectively storing different coal types, and electronic automatic batching scales are arranged below the coal blending bunkers; and iron removers are arranged between the coal receiving equipment and the pre-crushing equipment as well as between the coal blending bunker and the coal blending crushing equipment. The invention aims to solve the problems that coal with high hardness cannot be finely crushed and coal easy to crush is excessively crushed due to a process with coal blending equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of coal deep processing equipment, and in particular to a coal preparation device. Background Art

[0002] The coal preparation unit's mission is to provide qualified raw coal for the pyrolysis unit, including sampling, stockpiling, reclaiming, blending, crushing, and transportation. The coal preparation unit is divided into unloading, preparation, and blending and crushing stages. The unloading stage runs from the coal receiving pit to the bucket-wheel stacker-reclaimer in the coal yard; the preparation stage runs from the bucket-wheel stacker-reclaimer to the coal blending bunker; and the blending and crushing stage runs from the bottom of the coal blending bunker to the top of the coke oven coal tower.

[0003] Coal preparation processes primarily include pulverizing first, then blending, and blending first, then pulverizing. The pulverizing first, then blending process involves pulverizing different coking coals to varying finenesses based on their characteristics before blending and mixing them. This process is suitable for coals with significant differences in pulverizability and coking properties. Its advantage is that it can pulverize coals of varying characteristics to an appropriate fineness, which is beneficial for increasing the use of weakly caking coals and improving coke quality. However, its disadvantages are the complexity of the process, the large number of equipment, and the high investment required. This process is suitable for coals with significantly varying hardness.

[0004] Blending before pulverizing is a coal pulverization process in which individual coal types are blended and then pulverized together. This process is widely used in coking plants in my country. Its advantages include simplicity, minimal equipment, low investment, compact layout, and easy operation. No mixing equipment is required, and the various blended coal components are thoroughly mixed during the pulverization process. However, this process has the disadvantage that hard coals are not finely pulverized, while easily pulverized coals are over-pulverized. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the technical problem solved by the present invention is to provide a coal preparation device to solve the problem that the hard coal cannot be finely crushed and the easily crushed coal is too finely crushed due to the process of the existing coal blending equipment.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: a coal preparation device, including coal receiving equipment, pre-crushing equipment, coal sorting mechanism, coal blending bin, coal blending crushing equipment and coal tower arranged in sequence along the production process, and materials are transported between each device by a belt conveyor; the coal receiving equipment includes a coal receiving pit and a coal feeder arranged below the coal receiving pit, the coal sorting mechanism includes a first coal sorting mechanism arranged in front of the pre-crushing equipment and used to deliver coal that does not require pre-crushing to the coal blending bin; and a second coal sorting mechanism arranged behind the pre-crushing equipment and used to deliver pre-crushed coal to the coal blending bin; the coal blending bin is provided with multiple and stores different types of coal respectively, and an electronic automatic batching scale is provided under the coal blending bin; iron removers are provided between the coal receiving equipment and the pre-crushing equipment, and between the coal blending bin and the coal blending crushing equipment.

[0007] The beneficial effects of this solution are: by setting up pre-crushing equipment to pre-crush the types of coal with higher hardness, the crushing problem caused by the difference in hardness of different types of coal is effectively overcome, ensuring that all coal materials can meet the particle size requirements when subsequently mixed with low-hardness coal for crushing, avoiding the imbalance that the hard coal cannot be finely crushed, while the easy-to-crush coal is crushed too finely, and ensuring the uniformity of the coal particle size. The dual design of the coal sorting mechanism, with a coal sorting mechanism set before and after the pre-crushing equipment, accurately distinguishes between coal types that do not need to be pre-crushed and coal types to be pre-crushed, realizing reasonable material diversion and optimizing the production process. Multiple coal batching bins combined with electronic automatic batching scales can accurately control the proportion of each type of coal and provide high-quality raw materials for coking.

[0008] Furthermore, the coal silo utilizes a hyperbolic nozzle with a constant cross-sectional shrinkage ratio, lined with a hydrophobic, rolled microcrystalline plate. The hyperbolic nozzle's scientific shrinkage curve ensures uniform force on the coal during its descent, avoiding the material accumulation and uneven flow rate problems often associated with traditional straight or conical nozzles, effectively eliminating the phenomenon of material shelving. The hydrophobic, rolled microcrystalline plate lining, with its smooth surface and low coefficient of friction, further reduces the adhesion of the coal to the silo walls, lowering the risk of damp coal clumping and sticking to the silo. The combination of these two significantly enhances the fluidity of the coal within the silo, enabling it to be discharged at a stable, controllable rate, ensuring a uniform, continuous material flow for the feeding equipment. This in turn improves the measurement accuracy of the electronic automatic batching scale and avoids deviations in the coal blending ratio caused by feed fluctuations.

[0009] Furthermore, the coal distribution mechanism includes a transmission trough arranged in the transverse direction, and a conveyor belt arranged at the bottom of the transmission trough, a baffle arranged in the longitudinal direction is rotatably connected in the transmission trough, an opening is provided in the transmission trough body near the baffle, a distribution door is rotatably connected to the opening, and a distribution conveyor belt is provided outside the distribution door; the baffles, distribution doors, and distribution conveyor belts are provided in multiple corresponding manners, and the multiple distribution conveyor belts are respectively connected to different coal distribution bins; the rotating shafts of the baffles and distribution doors are provided with motors for controlling the opening or closing of the baffles and distribution doors.

[0010] The combined design of a conveyor trough, conveyor belt, baffles, distribution gates, and distribution conveyor belts achieves highly automated and precise coal sorting and distribution. The horizontally arranged conveyor troughs, combined with the bottom conveyor belt, rapidly transport coal. The vertically positioned baffles and distribution gates, precisely controlled by motors, flexibly block or release the coal flow, directing different coal types to the corresponding distribution conveyor belts as needed, ultimately delivering them to different distribution silos.

[0011] Furthermore, it also includes a coal preparation control device, which is electrically connected to the coal receiving device, the pre-crushing device, the coal separation mechanism, the coal blending bin, and the coal blending and crushing device. The coal preparation control device includes an input module, a central control module, a diversion control module, and a coal blending module; The input module is used to interact with the user to obtain the type of coal currently transmitted by the coal receiving equipment, and transmit the coal type information to the central control module; the central control module includes a storage unit and a control unit, and the storage unit is used to store coal blending requirements, pre-crushed coal types, baffle numbers, distribution door numbers and distribution bin numbers, as well as the corresponding association relationship between the baffle numbers, distribution numbers and distribution bin numbers; the control unit is used to control all baffles of the first coal distribution mechanism to open and all distribution doors to close when the current coal type information belongs to the pre-crushed coal type; it is also used to control different baffles and distribution plates to open or close when the current coal type information does not belong to the pre-crushed coal type, and associate the distribution bin corresponding to the distribution plate with the current coal type information and store it in the storage unit; the coal blending module is used to control the electronic automatic distribution scale of the corresponding coal distribution bin to distribute materials as required according to the coal blending requirements.

[0012] The control unit makes intelligent decisions based on the coal type information. When it is determined to be pre-crushed coal, it automatically opens the baffle of the first coal separation mechanism and closes the distribution door to guide the coal into the pre-crushing equipment to avoid the problem of mixed crushing of coal types with different hardnesses. If it is non-pre-crushed coal, it accurately controls the combined switch of the baffle and the distribution door to accurately distribute the coal to the corresponding batching bin, and establishes associated storage to ensure zero errors in coal type management. The coal blending module accurately controls the electronic automatic batching scales of each coal blending bin according to the coal blending requirements in the storage unit to achieve accurate allocation of coal type ratios. The entire system completely eliminates the problems of misjudgment and delay that are prone to traditional manual operations. It not only greatly improves coal preparation efficiency and reduces labor costs, but also strictly controls coal type processing and proportioning accuracy through automated processes, effectively reducing quality fluctuations caused by human factors and ensuring the stability of coking raw materials.

[0013] Furthermore, a screening device is provided between the pre-crushing equipment and the coal distribution bin, and the screening equipment is respectively provided with a qualified discharge port that meets the particle size requirements and an out-of-spec discharge port that does not meet the particle size requirements, and the qualified discharge port and the out-of-spec discharge port are respectively provided with a qualified material belt scale and an out-of-spec material belt scale; the qualified belt scale is connected to a second coal sorting mechanism; the out-of-spec material belt scale is respectively connected to a discharge channel and a return channel, the discharge channel outlet end is connected to the second coal sorting mechanism, and the return channel outlet end is connected to the pre-crushing equipment inlet end; the discharge channel and the return channel inlet ends are respectively provided with a discharge electric control valve and a return electric control valve, and the qualified material belt scale, the out-of-spec material belt scale, the discharge electric control valve, and the return electric control valve are respectively electrically connected to the coal preparation control equipment; The central control module also includes a crushing analysis unit, which is used to open the discharge electric control valve and close the return electric control valve when the ratio of qualified belt scale coal to the sum of qualified material belt scale coal and foreign material belt scale coal in unit time meets the set value, and open the return electric control valve when it does not meet the set value.

[0014] By measuring the weight ratio of coal on conveyor scales for qualified and unqualified materials, the system monitors in real time whether the discharge ratio after crushing meets the requirements. If the ratio does not meet the requirements (i.e., if the proportion of coal with a particle size greater than 3mm exceeds 10%), the unqualified coal is returned to the pre-crushing equipment through a return channel for further crushing. This real-time monitoring and instant feedback mechanism not only reduces the time and effort required for manual inspection and intervention, but also effectively reduces the risk of fluctuations in coal blending quality and deterioration in coke quality caused by uneven coal particle size, thereby improving the stability of coking production and the yield of finished products. Furthermore, the system's automated operation reduces material waste, optimizes resource utilization, and enhances the continuity and efficiency of the entire production process.

[0015] Furthermore, the central control module also includes an early warning unit, which is used to send an early warning message to the administrator terminal when the ratio of qualified coal on the conveyor scale to the sum of qualified coal on the conveyor scale and substandard coal on the conveyor scale does not meet the set value for a preset period of time. If the crushed coal still fails to meet the requirements within the set period of time, it indicates that there is a fault in the pre-crushing equipment or that the equipment parameters are not set properly, resulting in the inability to meet the crushing requirements. Therefore, an early warning message is sent to the administrator, allowing timely equipment maintenance. This avoids the lag of manual inspections and effectively prevents the escalation of faults through this proactive early warning.

[0016] Furthermore, the proportion of coal with a particle size of less than 3 mm in the pre-crushed coal is greater than or equal to 90% of the total pre-crushed coal. Pre-crushing high-hardness coal to a particle size of less than 3 mm, which accounts for 90% or more, allows for a better particle size match with low-hardness coal during subsequent co-crushing, avoiding uneven crushing due to hardness differences, ensuring uniform mixing and sufficient bonding of the coal, and improving coking quality.

[0017] Furthermore, after being pulverized by the coal blending and pulverizing equipment, the proportion of coal with a particle size of less than 3mm in the total pulverized coal is greater than or equal to 88%. In coking production, pulverizing coal to a particle size of less than 3mm accounts for 88% or more, ensuring uniform mixing of the blended coal, enhancing coal cohesion, significantly improving the mechanical strength and particle size uniformity of the coke, shortening coking time, reducing energy consumption, and broadening the range of coal blending. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of Example 1.

[0019] Figure 2 This is a schematic diagram of the coal distribution mechanism.

[0020] Figure 3 This is a schematic diagram of Example 2.

[0021] Figure 4 This is a schematic diagram of a belt scale for handling foreign materials. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods: The figure marks in the drawings of the specification include: coal receiving pit 1, coal feeder 11, first coal sorting mechanism 21, second coal sorting mechanism 22, baffle 23, material sorting door 24, transmission trough 25, material sorting conveyor belt 26, pre-crushing equipment 3, coal blending bin 4, electronic automatic batching scale 41, coal blending crushing equipment 5, coal tower 6, screening equipment 7, qualified material belt scale 71, substandard material belt scale 72, discharge channel 73, return channel 74, discharge electric control valve 75, return electric control valve 76.

[0023] Example 1 is basically as shown in the attached Figure 1 、 Figure 2The figure shows a coal preparation device, comprising a coal receiving device, a pre-crushing device 3, a coal sorting mechanism, a coal blending bin 4, a coal blending crushing device 5, a coal tower 6, and a coal preparation control device for controlling the operation of each device. Materials are transported between the devices via a belt conveyor. The coal receiving device comprises a coal receiving pit 1 and a coal feeder 11 disposed below the coal receiving pit 1. The coal feeder 11 is a reciprocating coal feeder. In this embodiment, two coal receiving pits 1 are provided. The coal sorting mechanism comprises a first coal sorting mechanism 21 disposed in front of the pre-crushing device 3 and used to deliver coal that does not require pre-crushing to the coal blending bin 4; and a second coal sorting mechanism 22 disposed after the pre-crushing device 3 and used to deliver pre-crushed coal to the coal blending bin 4. The coal blending bin 4 is provided with multiple devices, each storing different types of coal. An electronic automatic batching scale 41 is disposed below the coal blending bin 4. Iron removers are disposed between the coal receiving device and the pre-crushing device 3, and between the coal blending bin 4 and the coal blending crushing device 5. The coal material with a particle size of less than 3 mm in the crushed coal material accounts for greater than or equal to 90% of the total pre-crushed coal material. The coal material with a particle size of less than 3 mm in the crushed coal material after being crushed by the coal blending and crushing equipment 5 accounts for greater than or equal to 88% of the total crushed coal material.

[0024] The coal bunker 4 features a hyperbolic nozzle with a constant cross-sectional shrinkage ratio, lined with hydrophilic rolled microcrystalline sheet metal. In this embodiment, the coal bunker 4 consists of eight 10-meter-diameter hyperbolic nozzles. Each bunker has a storage capacity of approximately 1,000 tons, for a total storage capacity of approximately 8,000 tons, enough to store approximately 34 hours of coal for the coke oven.

[0025] The coal distribution mechanism includes a transmission trough 25 arranged in the transverse direction and a conveyor belt arranged at the bottom of the transmission trough 25. A baffle 23 arranged in the longitudinal direction is rotatably connected in the transmission trough 25. The transmission trough 25 body is provided with an opening near the baffle 23, and a distribution door 24 is rotatably connected to the opening. A distribution conveyor belt 26 is provided outside the distribution door 24; there are multiple baffles 23, distribution doors 24 and distribution conveyor belts 26 corresponding to each other, and the multiple distribution conveyor belts 26 are respectively connected to different coal distribution bins 4; the rotating shafts of the baffles 23 and the distribution doors 24 are provided with motors for controlling the opening or closing of the baffles 23 and the distribution doors 24.

[0026] In this embodiment, the transportation mode of the purchased clean coal is truck delivery. After being transported by cars, the coal is unloaded into the coal receiving pit 1. The coal feeder 11 under the coal receiving pit 1 feeds the coal into the belt conveyor, which sends it to the main belt conveyor of the coal yard stacker and reclaimer through the belt conveyor, and the stacker and reclaimer stacks it into the coal yard. When loading coal, different types of coal are loaded in sequence. The bucket wheel stacker and reclaimer takes the coal from the coal yard and feeds it to the belt conveyor. When the bucket wheel stacker and reclaimer is under maintenance, the bulldozer pushes the coal into the coal receiving pit 1 set in the coal yard, and the reciprocating feeder set under the pit feeds the coal onto the belt conveyor. After iron removal by the belt conveyor and the iron remover thereon, the coal types that need to be pre-crushed are sent to the pre-crushing equipment 3, and the other types of coal that do not need to be pre-crushed are directly sent to the coal distribution bin 4 through the dividing conveyor belt 26 of the first coal sorting mechanism 21. The coal types with larger hardness are pre-crushed, and the pre-crushed coal is sent to their respective coal distribution bins 4 for storage through the dividing conveyor belt 26 of the first coal sorting mechanism 21. The material distribution conveyor belt 26 also adopts a belt conveyor.

[0027] Electronic automatic batching scales 41 below the various coal-blending silos 4 distribute coal according to the corresponding blending ratio onto belt conveyors below the silos. The belt conveyors then transport the coal to the coal-blending pulverizing equipment 5 for crushing. After iron removal by the iron remover, the coal enters the coal-blending pulverizing equipment 5, where it is crushed to particles less than 3 mm, representing at least 88%. The coal is then transported by belt conveyors and fed into the coal tower 6 via a discharger mounted on the belt conveyor for use in the coke oven. The coal-blending pulverizing equipment 5 utilizes two reversible impact hammer crushers, one in operation and one in standby, with a processing capacity of 450 t / h per unit.

[0028] The coal preparation control equipment is electrically connected to the coal receiving equipment, the pre-crushing equipment 3, the coal dividing mechanism, the coal blending bin 4, and the coal blending crushing equipment 5 respectively. The coal preparation control equipment includes an input module, a central control module, a diversion control module, and a coal blending module; the input module is used to interact with the user to obtain the type of coal currently transmitted by the coal receiving equipment, and transmit the coal type information to the central control module; the central control module includes a storage unit and a control unit, and the storage unit is used to store coal blending requirements, pre-crushing coal types, baffle 23 numbers, material dividing door 24 numbers and material blending bin numbers, as well as the corresponding association relationship between the baffle 23 numbers, material dividing numbers, and material blending bin numbers; for example, the first coal dividing mechanism 21 has There are 5 baffles 23 and 5 material distribution doors 24. The baffles 23 are numbered D1-1, D1-2...D1-5 in the transmission direction; the material distribution doors 24 are numbered F1-1, F1-2...F1-5 in the transmission direction; the second coal distribution mechanism 22 has 3 baffles 23 and 3 material distribution doors 24. The baffles 23 are numbered D2-1, D2-2, D2-3 in the transmission direction; the material distribution doors 24 are numbered F2-1, F2-2, F2-3 in the transmission direction; there are 8 material distribution bins, numbered P1, P2...P8 in sequence; the association relationship is shown in Table 1 below, along the vertical direction; Table 1

[0029] The control unit is used to control all baffles 23 of the first coal dividing mechanism 21 to open and all dividing doors 24 to close when the current coal type information belongs to the pre-crushed coal type; it is also used to control different baffles 23 and dividing plates to open or close when the current coal type information does not belong to the pre-crushed coal type, and associate the batching bin corresponding to the batching plate with the current coal type information and store it in the storage unit; the coal batching module is used to control the electronic automatic batching scale 41 of the corresponding coal batching bin 4 to batch materials as required according to the coal batching requirements.

[0030] During use, different types of coal are loaded in sequence, and the staff enters the information of the type of coal currently being fed into the coal receiving equipment through the input module; the coal is then sent to the pre-crushing equipment via a belt conveyor. If the type of coal currently being transported is soft coal with a lower hardness that does not require pre-crushing, it will be sorted by the coal sorting mechanism to the coal distribution bin 4 when passing through the first coal sorting mechanism 21. For example, the current type of coal is gas coal, which does not require pre-crushing. When entering the first coal sorting mechanism 21, the first baffle 23 is closed and the first powder door is opened, that is, the baffle 23 numbered D1-1 is closed and the distribution door 24 numbered F1-1 is opened. At this time, according to the association relationship, the gas coal will be sent to the coal distribution bin 4 numbered P1. At this time, the coal distribution bin 4 numbered P1 is associated with the stored gas coal and stored in the storage unit. When continuing to transport the second type of coal, if the second type of coal is still a type of coal that does not require pre-crushing, the baffle 23 numbered D1-1 and the distribution door 24 numbered F1-2 are opened. The remaining distribution doors 24 and baffles 23 are closed, and the current type of coal is transported to the coal distribution bin 4 numbered P2. And so on. Similarly, different types of coal after pre-crushing are also classified and stored in different coal distribution bins 4 according to the mechanism of the first coal sorting mechanism 21.

[0031] like Figure 3 、 Figure 4As shown, the similarities between Example 2 and Example 1 are not repeated here. The difference is that a screening device 7 is provided between the pre-crushing device 3 and the coal distribution bin 4. The screening device 7 is respectively provided with a qualified discharge port that meets the particle size requirements and an out-of-spec discharge port that does not meet the particle size requirements. The qualified discharge port and the out-of-spec discharge port are respectively provided with a qualified material belt scale 71 and an out-of-spec material belt scale 72; the qualified belt scale is connected to the second coal sorting mechanism 22; the out-of-spec material belt scale 72 is provided in a closed box body, and the transmission end of the out-of-spec material belt scale 72 is respectively connected to a discharge channel 73 and a return channel 74. The material channel 74 and the outlet end of the discharge channel 73 are connected to the second coal sorting mechanism 22, and the outlet end of the return channel 74 is connected to the inlet end of the pre-crushing equipment 3; the inlet ends of the discharge channel 73 and the return channel 74 are respectively provided with a discharge electric control valve 75 and a return electric control valve 76, and the qualified material belt scale 71, the foreign material belt scale 72, the discharge electric control valve 75, and the return electric control valve 76 are respectively electrically connected to the coal preparation control equipment; a screw feeder or a bucket elevator is provided in the return channel 74, which is used to send the unqualified coal back into the pre-crushing equipment 3 for crushing again.

[0032] The central control module also includes a crushing analysis unit, which is used to open the discharge electric control valve 75 and close the return electric control valve 76 when the ratio of qualified belt scale coal to the sum of qualified material belt scale 71 and the other material belt scale 72 meets the set value within a unit time; otherwise, it opens the return electric control valve 76. The central control module also includes an early warning unit, which is used to send an early warning message to the administrator terminal when the ratio of qualified belt scale coal to the sum of qualified material belt scale 71 and the other material belt scale 72 does not meet the set value for a preset period of time.

[0033] In this embodiment, the proportion of coal with a particle size of less than 3 mm after crushing is set to be 90% or more of the total coal, that is, the filter particle size of the screening device 7 is 3 mm. Within a unit time, it is detected that the ratio of qualified belt scale coal to the sum of qualified material belt scale 71 and the other material belt scale 72 coal meets the set value, that is, the proportion of coal with a particle size of less than 3 mm after crushing is more than 90% of the total coal, indicating that the coal after crushing meets the crushing requirements. Therefore, the discharge valve is opened, and the coal from the qualified material belt scale 71 and the other material belt scale 72 is sent to the coal distribution bin 4 after passing through the second material distribution mechanism; otherwise, it is proved that the proportion of coal after crushing does not meet the requirements, so the discharge valve is closed and the return valve is opened, so that the unqualified coal, that is, the coal with a particle size greater than 3 mm, is sent back to the pre-crushing device 3 for re-crushing. If the coal after crushing still fails to meet the requirements within the set time, it means that there is a fault in the pre-crushing device 3 or the equipment parameter settings are unreasonable, resulting in the failure to meet the crushing requirements. Therefore, an early warning message is sent to the administrator so that the equipment maintenance can be carried out in time.

[0034] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A coal preparation device, characterized in that: It includes coal receiving equipment, pre-crushing equipment, coal sorting mechanism, coal distribution bin, coal distribution crushing equipment and coal tower which are arranged in sequence along the production process, and materials are transported between each equipment by belt conveyors; the coal receiving equipment includes a coal receiving pit and a coal feeder arranged below the coal receiving pit, the coal sorting mechanism includes a first coal sorting mechanism which is arranged in front of the pre-crushing equipment and is used to deliver the coal that does not need to be pre-crushed to the coal distribution bin; and a second coal sorting mechanism which is arranged behind the pre-crushing equipment and is used to deliver the pre-crushed coal to the coal distribution bin; the coal distribution bin is provided with multiple ones and stores different types of coal respectively, and an electronic automatic batching scale is provided under the coal distribution bin; iron removers are provided between the coal receiving equipment and the pre-crushing equipment, and between the coal distribution bin and the coal distribution crushing equipment.

2. A coal preparation device according to claim 1, characterized in that: The coal distribution bunker adopts a hyperbolic nozzle with a constant cross-sectional shrinkage rate, and the nozzle is lined with a non-hydrophilic rolled microcrystalline plate.

3. A coal preparation device according to claim 1, characterized in that: The coal distribution mechanism includes a transmission trough arranged in the transverse direction and a transmission belt arranged at the bottom of the transmission trough. A baffle arranged in the longitudinal direction is rotatably connected in the transmission trough. The transmission trough body is provided with an opening near the baffle, and a distribution door is rotatably connected to the opening. A distribution conveyor belt is provided outside the distribution door; the baffles, distribution doors, and distribution conveyor belts are provided in multiple corresponding manners, and the multiple distribution conveyor belts are respectively connected to different coal distribution bins; the rotating shafts of the baffles and distribution doors are provided with motors for controlling the opening or closing of the baffles and distribution doors.

4. A coal preparation device according to claim 1, characterized in that: It also includes a coal preparation control device, which is electrically connected to the coal receiving device, the pre-crushing device, the coal separation mechanism, the coal blending bin, and the coal blending and crushing device. The coal preparation control device includes an input module, a central control module, a diversion control module, and a coal blending module; The input module is used to interact with the user to obtain the type of coal currently being delivered by the coal receiving equipment, and transmit the coal type information to the central control module; The central control module includes a storage unit and a control unit, wherein the storage unit is used to store coal blending requirements, pre-crushed coal types, baffle numbers, distribution door numbers and distribution bin numbers, as well as the corresponding association relationship between the baffle numbers, distribution numbers and distribution bin numbers; the control unit is used to control all baffles of the first coal distribution mechanism to open and all distribution doors to close when the current coal type information belongs to the pre-crushed coal type; and is also used to control different baffles and distribution plates to open or close when the current coal type information does not belong to the pre-crushed coal type, and associate the distribution bin corresponding to the distribution plate with the current coal type information and store them in the storage unit; The coal blending module is used to control the electronic automatic batching scale of the corresponding coal blending bin to batch coal as required according to the coal blending requirements.

5. A coal preparation device according to claim 4, characterized in that: A screening device is provided between the pre-crushing equipment and the coal distribution bin, and the screening equipment is respectively provided with a qualified discharge port that meets the particle size requirements and an out-of-spec discharge port that does not meet the particle size requirements, and the qualified discharge port and the out-of-spec discharge port are respectively provided with a qualified material belt scale and an out-of-spec material belt scale; the qualified belt scale is connected to a second coal sorting mechanism; the out-of-spec material belt scale is respectively connected to a discharge channel and a return channel, the discharge channel outlet end is connected to the second coal sorting mechanism, and the return channel outlet end is connected to the pre-crushing equipment inlet end; the discharge channel and the return channel inlet ends are respectively provided with a discharge electric control valve and a return electric control valve, and the qualified material belt scale, the out-of-spec material belt scale, the discharge electric control valve, and the return electric control valve are respectively electrically connected to the coal preparation control equipment; The central control module also includes a crushing analysis unit, which is used to open the discharge electric control valve and close the return electric control valve when the ratio of qualified belt scale coal to the sum of qualified material belt scale coal and foreign material belt scale coal in unit time meets the set value, and open the return electric control valve when it does not meet the set value.

6. A coal preparation device according to claim 5, characterized in that: The central control module also includes an early warning unit, which is used to send an early warning message to the administrator terminal when the ratio of qualified belt scale coal to the sum of qualified material belt scale coal and substandard material belt scale coal does not meet the set value for a preset time period.

7. The coal preparation device according to claim 1, characterized in that: In the pre-crushed coal, the coal with a particle size of less than 3 mm accounts for greater than or equal to 90% of the total pre-crushed coal.

8. The coal preparation device according to claim 1, characterized in that: The coal material with a particle size of less than 3 mm in the coal material crushed by the coal blending and crushing equipment accounts for greater than or equal to 88% of the total crushed coal material.

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