A control method for removing impurities from raw coal

Abstract

This invention relates to the field of raw coal impurity removal technology and provides a control method for raw coal impurity removal. The control method includes the following steps: First, the raw coal undergoes preliminary screening to remove fine coal powder, while simultaneously distributing the coal flow evenly. The raw coal after fine coal powder removal enters the next stage process. Second, in the metal impurity removal process, during the transportation of the raw coal, a material identifier is used to detect and remove metal impurities present in the raw coal. The raw coal after metal impurity removal is then transported to the next impurity removal screening process. Next, in the impurity removal screening process, the coal flow is separated. Coal flows meeting the discharge requirements fall and are diverted under the action of gravity and kinetic energy, while large coal chunks and impurities that cannot fall are further screened for impurity removal. Finally, coal chunks carried by the impurities are screened out, and the impurities are transported to a recycling bin. This control method can remove ferrous metal impurities such as anchor bolts from raw coal, as well as large impurities, effectively improving the quality of the raw coal.

Description

Technical Field

[0001] This invention relates to the field of raw coal impurity removal technology, and more specifically to a control method for raw coal impurity removal. Background Technology

[0002] During coal mining, due to the complex working conditions, lightweight debris such as wood, rubber, and woven bags, as well as ferrous debris such as anchor bolts and metal mesh, and larger debris such as stones are often mixed in during underground mining. If these debris enters the coal preparation plant's production system and is not removed in time, it can not only cause system blockages and damage to related structural equipment, but more seriously, it can lead to production stoppages and affect the overall production progress of the coal mine.

[0003] However, the current methods used in coal preparation plants for removing impurities are not very intelligent and cannot completely remove all types of impurities. Furthermore, relying on manual sorting of impurities results in low efficiency, high labor intensity for employees, and low safety. Moreover, impurities are often not completely removed, which seriously affects the progress of intelligentization in coal preparation plants.

[0004] Therefore, this invention proposes a control method for removing impurities from raw coal. Summary of the Invention

[0005] The purpose of this invention is to provide a control method for removing impurities from raw coal, which can remove impurities from raw coal to avoid system blockage and equipment damage, and ensure normal production operations in coal mines.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for controlling impurities in raw coal includes the following steps:

[0008] Step 1: First, the raw coal is initially screened to remove fine coal powder. At the same time, the coal flow is evenly distributed. The raw coal after removing the fine coal powder enters the next stage of metal impurity removal process.

[0009] Step 2: In the process of removing metal impurities, when the raw coal is being transported, the metal impurities present in the raw coal are detected and removed by the material identifier. The raw coal after removing the metal impurities is transported to the next stage of the impurity removal and screening process.

[0010] Step 3: In the impurity removal and screening process, the coal stream is screened. The coal stream that meets the requirements for falling is diverted by gravity and kinetic energy. Large coal blocks and impurities that cannot fall are further screened for impurity removal.

[0011] Step 4: Further sieve the coal chunks carried by the debris obtained in Step 3, while the large coal chunks and debris are transported to the recycling bin.

[0012] Preferably, in step 1, the raw coal is preliminarily screened using a primary screening mechanism.

[0013] The feeding primary screening mechanism includes a feeding hopper and a uniform feeder. A guide plate is installed inside the feeding hopper, and screening grooves are opened in the guide plate. Coal powder with smaller particle size falls through the screening grooves of the guide plate, while lumpy raw coal enters the next stage of transportation process through the discharge port of the feeding hopper.

[0014] Meanwhile, a distributor is installed on the rear side of both the inlet and outlet of the feeding funnel. The raw coal collides and contacts with the distributor, which allows the raw coal to be evenly dispersed and reduces the stickiness of the coal flow.

[0015] Preferably, in step 2, the transport of lumpy raw coal is achieved by a coal conveyor belt drive mechanism, and when the material identifier detects that there are metal impurities mixed in the raw coal, the belt-type iron removal mechanism is activated to remove the metal impurities mixed in the raw coal.

[0016] The material identifier includes a metal detector, a coal flow sensor, and a speed detection sensor;

[0017] Among them, the metal detector determines the presence and size of metal on the surface of the coal conveyor belt drive mechanism by sensing data from electromagnetic pulse waves, while the coal flow sensor and speed detection sensor detect data to assist in determining the instantaneous coal flow and detecting the instantaneous material position.

[0018] When the metal detector detects metal debris on the surface of the coal conveyor belt, it works in conjunction with the coal flow sensor and speed detection sensor to detect the location of the metal debris and simultaneously activates the belt-type debris removal mechanism to remove the debris.

[0019] Preferably, in step 2, a belt-type iron removal mechanism is provided above the coal conveyor belt drive mechanism; the belt-type iron removal mechanism includes a debris transfer belt, a belt motor and an electromagnet, wherein the electromagnet is disposed in the interlayer space of the debris transfer belt;

[0020] Based on the detection results of the three sets of sensors of the material identifier, the electromagnetic excitation current is precisely turned on, and the electromagnet is used to excite the magnetism to attract metal impurities to the impurity transfer belt; at the moment of iron-coal separation, the belt motor of the belt-type iron removal mechanism is turned on, and the rotating impurity transfer belt will inertially throw the metal objects attracted to the belt surface off the belt, thereby realizing iron removal control.

[0021] Preferably, in step 3, a grate screening mechanism is used to screen out large impurities from the raw coal. The grate screening mechanism includes a hydraulic cylinder, a square tube, and swing rods. The hydraulic cylinder drives the square tube to rotate, and multiple swing rods on the square tube rotate with the square tube. This prevents large impurities from getting stuck in the gaps between the swing rods. Coal blocks fall into the hopper below through the gaps between the swing rods for storage, while large impurities are trapped on the swing rods and await rotary impurity removal.

[0022] The rotary roller hook-claw screening mechanism is used to remove large debris by rotary throwing. The rotary roller hook-claw screening mechanism includes a geared motor, a cam divider, a rotating shaft, and hooks. The geared motor and cam divider can drive the rotating shaft to rotate intermittently. Multiple sets of hooks on the rotating shaft hook up the debris and throw it to the next screening process.

[0023] By installing pressure and angle sensors on the swing arm, the presence of large impurities in the raw coal is detected. When the pressure sensor detects the pressure value on the swing arm and the angle sensor detects the angle of movement of the swing arm, the movement state of the swing arm is adjusted by the hydraulic cylinder of the grate screening mechanism. The geared motor and cam divider of the rotary roller hook-claw screening mechanism intermittently drive the hook to move, hooking up the impurities and removing them by rotary throwing.

[0024] Preferably, in step 4, large debris is transported to the recycling bin by a strip-type debris discharge mechanism;

[0025] The strip-type debris removal mechanism includes a motor, rollers, and multiple strips arranged at equal intervals. The motor drives the strips to rotate through the rollers. Coal chunks in the debris fall into the hopper below through the gaps between the strips. Large debris is trapped on the strips and transported to the recycling bin.

[0026] The beneficial technical effects of this invention are:

[0027] This invention provides a control method for removing impurities from raw coal. The method involves filtering out coal powder from the raw coal using a primary screening mechanism and uniformly dispersing the coal using a uniform feeder to prevent excessive coal accumulation and equipment jamming. A belt-type iron removal mechanism removes metallic impurities from the coal. A grate-type screening mechanism combined with a rotary roller hook-claw screening mechanism removes large impurities from coal lumps. Finally, a strip-type impurity removal mechanism transports the impurities away. This control method can remove not only ferrous metal impurities such as anchor bolts and metal mesh from raw coal but also large impurities such as stones, effectively improving the quality of raw coal while preventing equipment damage caused by impurities and ensuring the normal operation of the coal mine. In addition to mining operations, the system uses speed and flow sensors to detect the speed and flow of coal to determine its location. A metal detector is used to detect the presence of metal impurities in the raw coal, determining whether to activate the strip-type iron removal mechanism. Pressure and angle sensors are also used to detect the presence of large impurities in the raw coal, determining whether to activate the rotary roller and claw screening mechanism to remove the impurities. The entire impurity removal process is highly intelligent, ensuring efficiency, improving the quality of raw coal, and protecting the health and safety of workers, meeting the requirements of modern industrial development. Attached Figure Description

[0028] Figure 1 This is a flowchart of the control method for removing impurities from raw coal in an embodiment of the present invention;

[0029] Figure 2 This is a front view of the impurity removal device in an embodiment of the present invention;

[0030] Figure 3 This is a perspective view of the impurity removal device in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the feeding primary screening mechanism in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the belt-type iron removal mechanism in an embodiment of the present invention;

[0033] Figure 6 This is an assembly diagram of the grate screening mechanism, the rotary roller hook claw screening mechanism, and the cleaning knife mechanism in an embodiment of the present invention.

[0034] Figure 7 This is an assembly diagram of the grate screening mechanism and the rotary roller hook claw screening mechanism in an embodiment of the present invention;

[0035] Figure 8 This is an assembly diagram of the rotary roller hook-claw screening mechanism and the cleaning mechanism in an embodiment of the present invention;

[0036] Figure 9This is a schematic diagram of the strip-type impurity removal mechanism in an embodiment of the present invention;

[0037] Among them, 1-Infeed primary screening mechanism; 11-Feeding funnel; 111-Guide plate; 12-Popularizer;

[0038] 2-Belt-type iron removal mechanism: 21-Waste transfer belt, 22-Electromagnet;

[0039] 3-Grate screening mechanism: 31-Square tube, 32-Swing rod, 33-Drive block, 34-Stop block;

[0040] 4-Rotating roller hook-claw type screening mechanism: 41-Reduction motor, 42-Cam divider, 43-Rotating shaft, 44-Hook;

[0041] 5-Cleaning mechanism: 511-First cleaning scraper, 521-Slide rail, 522-Slider, 523-Second cleaning scraper;

[0042] 6-Strip-type impurity removal mechanism: 61-Roller, 62-Strip;

[0043] 7-Recycling bin. Detailed Implementation

[0044] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. Certain embodiments of the invention will be described more fully below with reference to the accompanying drawings, and some, but not all, of these embodiments will be shown. In fact, various embodiments of the invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to enable the invention to meet applicable legal requirements.

[0045] In the description of this invention, it should be noted that the terms "inner," "outer," "upper," "lower," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] refer to Figure 1 As shown in the embodiment of the present invention, a control method for removing impurities from raw coal is provided, specifically including the following steps:

[0047] Step 1: First, the raw coal is initially screened to remove fine coal powder. At the same time, the coal flow is evenly distributed. The raw coal after removing the fine coal powder enters the next stage of metal impurity removal process.

[0048] Specifically, in combination Figure 4 As shown, the coal powder in the raw coal is screened out by the primary screening mechanism 1. The primary screening mechanism 1 mainly includes a feeding hopper 11 and a uniform feeder 12. A guide plate 111 is set inside the feeding hopper 11. Screening grooves are opened on the guide plate 111. Coal powder with smaller particle size falls through the screening grooves of the guide plate 111, while the lumpy raw coal enters the next stage of transportation process through the discharge port of the feeding hopper 11.

[0049] At the same time, combined Figure 4 As shown, a uniform feeder 12 is provided on the rear side of both the feed inlet and the discharge outlet of the feed hopper 11. The uniform feeder 12 includes a connecting shaft and multiple swing hooks evenly spaced on the connecting shaft. The raw coal collides and contacts with the swing hooks of the uniform feeder 12, so that the raw coal can be evenly dispersed, which can prevent the coal from accumulating and causing the device to block. At the same time, it can also provide favorable conditions for the next step of iron removal operation.

[0050] Step 2: In the process of removing metal impurities, when the raw coal is being transported, the metal impurities present in the raw coal are detected and removed by the material identifier. The raw coal after removing the metal impurities is transported to the next stage of the impurity removal and screening process.

[0051] Specifically, in combination Figure 2 and Figure 3 As shown, the transport of lumpy raw coal is achieved through the coal conveyor belt drive mechanism, and when the material identifier detects that there are metal impurities mixed in the raw coal, the belt-type iron removal mechanism 2 is activated to remove the metal impurities mixed in the raw coal.

[0052] The material identifier includes a metal detector, a coal flow sensor, and a speed detection sensor. The metal detector uses electromagnetic pulse wave sensing data to determine the presence and size of metal on the surface of the coal conveyor belt drive mechanism. The coal flow sensor and speed detection sensor use data to assist in determining the instantaneous coal flow rate and detecting the instantaneous material position. When the metal detector detects metal debris on the surface of the coal conveyor belt drive mechanism, it works with the coal flow sensor and speed detection sensor to locate the debris and simultaneously activates the belt-type debris removal mechanism 2 to remove it.

[0053] Combination Figure 1 , Figure 2 and Figure 5 As shown, a belt-type iron removal mechanism 2 is provided above the coal conveyor belt drive mechanism to remove metallic impurities from the raw coal. The belt-type iron removal mechanism 2 includes an impurity transfer belt 21, a belt motor, and an electromagnet 22, wherein the electromagnet 22 is disposed in the interlayer space of the impurity transfer belt 21.

[0054] Based on the detection results of the three sets of sensors of the material identifier, the electromagnetic excitation current is precisely turned on, and the electromagnet is used to excite the magnetism to attract metal impurities to the impurity transfer belt 21; at the moment of iron-coal separation, the belt motor of the belt-type iron removal mechanism 2 is turned on, and the rotating impurity transfer belt 21 will inertially throw the metal objects attracted to the belt surface off the belt, thereby realizing iron removal control.

[0055] Step 3: In the impurity removal and screening process, the coal stream is screened. The coal stream that meets the requirements for falling is diverted by gravity and kinetic energy. Large coal blocks and impurities that cannot fall are further screened for impurity removal.

[0056] Specifically, in combination Figure 7 As shown, a grate-type screening mechanism 3 is used to screen out large impurities from raw coal. The grate-type screening mechanism 3 includes a hydraulic cylinder, a square tube 31, swing rods 32, a drive block 33, and a stop block 34. The square tube 31 is horizontally arranged, and both ends of the square tube 31 are connected to drive blocks 33 with ear-shaped outer contours. The hydraulic cylinder drives the square tube 31 to rotate via the drive blocks 33. Multiple swing rods 32 are arranged at equal intervals on the square tube 31. The swing rods 32 swing with the square tube 31, and the swing amplitude and frequency are controlled by the hydraulic cylinder to prevent large impurities from getting stuck in the gaps between the swing rods 32. Coal blocks fall through the gaps between the swing rods 32 into the lower hopper for storage, while large impurities are trapped on the swing rods 32 for subsequent hooking and rotary throwing operations. Meanwhile, the square tube 31 is also equipped with multiple baffles 34. Each swing rod 32 has a baffle 34 on both sides of its end. The baffles 34 prevent debris from rolling back to the position between the grate screening mechanism 3 and the coal conveyor belt drive mechanism when the swing rod 32 is raised, thus preventing damage to the equipment. At the same time, the outer contour of the baffle 34 is semi-circular. When the coal block rolls freely from the coal conveyor belt drive mechanism, the contour arc of the baffle 34 is tangent to the falling direction of the coal block, allowing the coal block or debris to fall more smoothly onto the swing rod 32.

[0057] Combination Figure 7 As shown, the rotary roller hook-claw screening mechanism 4 can hook up oversized or overweight debris and throw it to the strip-type debris discharge mechanism 6. The rotary roller hook-claw screening mechanism 4 mainly includes a geared motor 41, a cam divider 42, a rotating shaft 43, and hooks 44. The geared motor 41 and the cam divider 42 provide power to drive the rotating shaft 43 to rotate intermittently. The multiple sets of hooks 44 on the rotating shaft 43 throw large debris into the next screening process.

[0058] Specifically, in combination Figure 7As shown, a geared motor 41 is mounted on a base and connected to a cam divider 42. The cam divider 42 is connected to a rotating shaft 43, which has multiple sets of hooks 44. Each set consists of three hooks 44, all three hooks 44 lying on the same plane with a 120° interval between them. Spacer sleeves are provided between adjacent sets of hooks 44 to effectively separate them. The individual hooks 44 in each set are positioned one-to-one, forming three rows of hooks arranged axially along the rotating shaft 43.

[0059] When a large object is caught on the swing arm 32, the geared motor 41 is turned on to provide power, and the cam divider 42 causes the rotating shaft 43 to rotate intermittently. This allows the hooks 44 on the rotating shaft 43 to complete one rotation and throw of the large object every 120°. That is, with each rotation, a row of hooks simultaneously completes the process of hooking up the object above the swing arm 32 and rotating and throwing it to remove the debris. This also prevents the object from being thrown out by the hooks 44 before it has completely settled. The entire rotation and throwing process is more controllable.

[0060] The presence of large impurities in the raw coal is detected by installing pressure and angle sensors on the swing arm 32. The pressure sensor detects the pressure value on the swing arm 32, and the angle sensor detects the movement angle between the swing arm 32 and the horizontal plane. The obtained data is compared with a given preset value to determine when to activate the grate screening mechanism 3 and the rotary roller hook-claw screening mechanism 4. The movement state (vibration, swinging, or stillness) of the swing arm 32 is adjusted by controlling the cylinder of the grate screening mechanism 3. The reduction motor 41 and cam divider 42 of the rotary roller hook-claw screening mechanism 4 intermittently drive the hook 44 to hook up the impurities and remove them by swirling.

[0061] At the same time, combined Figure 8As shown, a cleaning mechanism 5 for cleaning the hooks 44 is also provided above the rotary hook-claw screening mechanism 4. This cleaning mechanism 5 includes a first cleaning scraper 511 mounted on a first assembly shaft, the first assembly shaft being relatively fixed in position. The cleaning mechanism also includes a second cleaning scraper 523 mounted on a second assembly shaft. The second assembly shaft is connected to a slider 522 via a bearing seat. A slide rail 521 is provided at the bottom of the slider 522. The second cleaning scraper 523 can move and adjust its position along the slide rail 521. A cylinder drives the slider 522 to move, which in turn drives the second cleaning scraper 523 to slide back and forth periodically, cleaning the entangled debris on the hooks 44. This helps to ensure the smooth completion of the next rotary throwing operation, achieving continuous, unblocked operation. When the hooks 44 rotate, they generate relative movement with the first cleaning scraper 511 and the second cleaning scraper 523, thereby cutting soft debris such as ropes entangled on the hooks 44, ensuring the normal operation of the rotary hook-claw screening mechanism 4 and completing the throwing and removal of large debris. The number of the first cleaning scraper 511 and the second cleaning scraper 523 is equal to the number of the hook claw group, which can ensure that each hook claw 44 can be cleaned, prevent blockage, and ensure the smooth progress of the rotary polishing and impurity removal operation.

[0062] Step 4: Further sieve out the coal chunks carried by the debris obtained in Step 3, while the large coal chunks and debris are transported to the recycling bin 7.

[0063] Specifically, in combination Figure 9 As shown, large debris is transported to the recycling bin 7 by a strip-type debris discharge mechanism 6. The strip-type debris discharge mechanism 6 includes a motor, a roller 61, and multiple strips 62 arranged at equal intervals. The motor drives the strips 62 to rotate through the roller 61. Raw coal falls into the silo below through the gaps between the strips 62, while large debris is trapped on the strips 62 and transported to the recycling bin 7.

[0064] The present invention provides a control method for removing impurities from raw coal. The method involves filtering out coal powder from the raw coal using a primary screening mechanism 1, and uniformly dispersing the coal using a uniform feeder 12 to prevent excessive coal accumulation that could cause equipment jamming. A belt-type iron removal mechanism 2 removes metallic impurities from the coal. A grate-type screening mechanism 3, in conjunction with a rotary roller hook-claw screening mechanism 4, removes large impurities from the coal blocks. Finally, a strip-type impurity removal mechanism 6 transports the impurities away. This control method can remove ferrous metal impurities such as anchor bolts and metal mesh from the raw coal, as well as large impurities such as stones, effectively improving the quality of the raw coal. It also prevents impurity accumulation that could damage the equipment, thus ensuring normal mining operations in the coal mine. Simultaneously, by cooperating with speed detection sensors and coal flow sensors to detect the speed and flow rate of the coal, the location of the coal is determined. Metal detectors and material identification sensors detect the presence of metal impurities in the raw coal, deciding whether and when to activate the belt-type iron removal mechanism 2 for iron removal. This achieves the purpose of removing metal impurities from the raw coal. Furthermore, the belt-type iron removal mechanism 2 only operates when the metal detector detects metal impurities or when the metal-containing raw coal is about to pass through, thus saving operating costs. Pressure detection sensors and angle detection sensors can detect the presence of large impurities in the raw coal, activating the rotary roller hook-claw screening mechanism 4 to hook up the impurities and perform rotary throwing for impurity removal. The entire impurity removal process has a high degree of intelligence, meeting the requirements of modern industrial development. This invention automates the graded impurity removal process in coal preparation plants, reducing (or eliminating) manual intervention, reducing or lowering the amount of impurities handled by downstream process equipment, contributing to the function of raw coal grading, and reducing the failure rate of transportation systems and equipment caused by impurities. By optimizing equipment control methods, blockages can be effectively reduced, production line shutdowns caused by equipment failures can be avoided, and coal mine production efficiency can be improved.

[0065] Of course, the specific embodiments described above further illustrate the purpose, technical solution and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for impurity removal of raw coal, characterized by, Includes the following steps: Step 1: First, the raw coal is initially screened to remove fine coal powder. At the same time, the coal flow is evenly distributed. The raw coal after removing the fine coal powder enters the next stage of metal impurity removal process. Step 2: In the process of removing metal impurities, the metal impurities present in the raw coal are detected and removed by the material identifier. The raw coal after removing the metal impurities is transported to the next stage of the impurity removal and screening process. The conveyor belt mechanism is used to transport lumpy raw coal. When the material identifier detects that there are metal impurities mixed in the raw coal, the belt-type iron removal mechanism is activated to remove the metal impurities mixed in the raw coal. Step 3: In the impurity removal and screening process, the coal stream is screened. The coal stream that meets the requirements for falling is diverted by gravity and kinetic energy. Large coal blocks and impurities that cannot fall are further screened for impurity removal. In step 3, a grate screening mechanism is set up to screen out large impurities in the raw coal. The grate screening mechanism includes a hydraulic cylinder, a square tube, and swing rods. The hydraulic cylinder drives the square tube to rotate, and multiple swing rods set on the square tube rotate with the square tube. This can prevent large impurities from getting stuck in the gaps between the swing rods. Coal blocks fall into the hopper below through the gaps between the swing rods for storage, while large impurities are trapped on the swing rods and await rotary impurity removal. The rotary roller hook-claw screening mechanism is used to remove large debris by rotary throwing. The rotary roller hook-claw screening mechanism includes a geared motor, a cam divider, a rotating shaft, and hooks. The geared motor and cam divider can drive the rotating shaft to rotate intermittently. Multiple sets of hooks on the rotating shaft hook up the debris and throw it to the next screening process. By setting pressure and angle sensors on the swing arm, the presence of large impurities in the raw coal is detected. The pressure sensor detects the pressure value on the swing arm and the angle sensor detects the movement angle of the swing arm, thereby controlling the hydraulic cylinder of the grate screening mechanism to adjust the movement state of the swing arm. The geared motor and cam divider of the rotary roller hook-claw screening mechanism intermittently drive the hook to hook up the impurities and remove them by rotary throwing. Step 4: Further sieve the coal chunks carried by the debris obtained in Step 3, while the large coal chunks and debris are transported to the recycling bin.

2. The control method for removing impurities from raw coal according to claim 1, characterized in that: In step 1, the raw coal is initially screened using a primary screening mechanism. The feeding primary screening mechanism includes a feeding hopper and a uniform feeder. A guide plate is installed inside the feeding hopper, and screening grooves are opened in the guide plate. Coal powder with smaller particle size falls through the screening grooves of the guide plate, while lumpy raw coal enters the next stage of transportation process through the discharge port of the feeding hopper. Meanwhile, a distributor is installed on the rear side of both the inlet and outlet of the feeding funnel. The raw coal collides and contacts with the distributor, which allows the raw coal to be evenly dispersed and reduces the stickiness of the coal flow.

3. The control method for removing impurities from raw coal according to claim 1, characterized in that: In step 2, the material identifier includes a metal detector, a coal flow sensor, and a speed detection sensor; Among them, the metal detector determines the presence and size of metal on the surface of the coal conveyor belt drive mechanism by sensing data from electromagnetic pulse waves, while the coal flow sensor and speed detection sensor detect data to assist in determining the instantaneous coal flow and detecting the instantaneous material position. When the metal detector detects metal debris on the surface of the coal conveyor belt, it works in conjunction with the coal flow sensor and speed detection sensor to detect the location of the metal debris and simultaneously activates the belt-type debris removal mechanism to remove the debris.

4. The control method for removing impurities from raw coal according to claim 3, characterized in that: In step 2, a belt-type iron removal mechanism is provided above the coal conveyor belt drive mechanism; the belt-type iron removal mechanism includes a debris transfer belt, a belt motor and an electromagnet, wherein the electromagnet is installed in the interlayer space of the debris transfer belt. Based on the detection results of the three sets of sensors of the material identifier, the electromagnetic excitation current is precisely turned on, and the electromagnet is used to excite the magnetism to attract metal impurities to the impurity transfer belt; at the moment of iron-coal separation, the belt motor of the belt-type iron removal mechanism is turned on, and the rotating impurity transfer belt will inertially throw the metal objects attracted to the belt surface off the belt, thereby realizing iron removal control.

5. The control method for removing impurities from raw coal according to claim 1, characterized in that: In step 4, large debris is transported to the recycling bin by a strip-type debris removal mechanism. The strip-type debris removal mechanism includes a motor, rollers, and multiple strips arranged at equal intervals. The motor drives the strips to rotate through the rollers. Coal chunks in the debris fall into the hopper below through the gaps between the strips. Large debris is trapped on the strips and transported to the recycling bin.

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