Belt conveyor for raw coal iron removal

Abstract

The utility model provides a belt conveyor for raw coal iron removal, which belongs to the technical field of iron removal mechanical equipment and comprises a conveying belt arranged on a mounting rack, and a driving roller and a reversing roller are respectively wound at two ends of the conveying belt; one end of the driving roller is connected with the output end of a driving motor, and the inner wall of the reversing roller is provided with a whole circle of permanent magnets; a discharging groove is formed below the tail end of the conveying belt, and an impurity hopper is arranged on the partition wall of the discharging groove. Two symmetrical supporting rods are arranged on the two sides of the middle of the mounting rack, and a top plate is connected between the two supporting rods through bolts. A material uniformizing block is connected below the top plate, a plurality of blocking rods are evenly connected to the bottom of the material uniformizing block, and gaps smaller than the particle size of raw coal are reserved between the bottoms of the blocking rods and the conveying belt. The belt conveyor is good in iron removal effect and high in iron removal efficiency, iron impurities in raw coal can be further prevented from entering follow-up equipment to cause abrasion and damage to the follow-up equipment, and the coal washing efficiency and the operation stability of the coal washing procedure are also improved.

Description

Technical Field

[0001] This utility model relates to the field of iron removal machinery and equipment, and in particular to a belt conveyor for removing iron from raw coal. Background Technology

[0002] Currently, the coal washing industry mostly uses heavy media separation. In the conventional process of a coal washing plant, raw coal mined from the mine is transported to the raw coal storage yard via a conveyor system. The raw coal in the storage yard is fed into a belt conveyor by a feeder in the receiving pit, and then transported to the preparation workshop for screening and crushing. During the mechanical mining of raw coal, iron impurities such as iron objects and ferromagnetic particles are inevitably present. If these impurities are not removed, they will affect the normal operation of the crusher after entering it, and in severe cases, may even cause the coal washing process to stop for maintenance. Therefore, in existing technology, an iron remover is usually installed at the head of the belt conveyor that transports raw coal to the grading screen (used for screening). However, due to the high speed of the belt conveyor, the iron removal effect is not as expected, and the raw coal still contains iron objects and / or ferromagnetic particles that have not been removed. Subsequently, the raw coal needs to be sent to a manual sorting belt conveyor, where large pieces of gangue, iron objects, ferromagnetic particles, and other impurities are manually picked out. However, due to limited manpower, it is not possible to completely remove them. Therefore, iron impurities in raw coal can enter the crusher, causing equipment damage and affecting the normal production of the coal washing plant. Utility Model Content

[0003] This utility model provides a belt conveyor for removing iron from raw coal, which solves the problems of poor iron removal effect and low iron removal efficiency of existing belt conveyors that rely solely on manual selection of iron impurities, which can easily cause damage to equipment such as crushers and affect the normal operation of the coal washing process.

[0004] This utility model provides a belt conveyor for removing iron from raw coal, comprising: a conveyor belt mounted on a mounting frame, with a drive roller and a reversing roller respectively wound around both ends of the conveyor belt, the drive roller and the reversing roller being arranged relatively parallel, and the side closer to the drive roller being the feed end of the conveyor belt; one end of the drive roller being connected to the output end of a drive motor, and a full circle of permanent magnets being installed on the inner wall of the reversing roller; a discharge chute being provided below the end of the conveyor belt near the reversing roller, and an impurity hopper being provided next to the discharge chute near the drive roller; the edge of the impurity hopper not exceeding the central axis of the reversing roller; two symmetrical support rods being provided on both sides of the middle of the mounting frame, the two support rods having multiple screw holes in the vertical direction, and a top plate being bolted between the two support rods, the height of which is adjustable; a material leveling block being connected below the top plate, and multiple baffles being evenly connected to the bottom of the material leveling block, with a gap smaller than the particle size of the raw coal left between the bottom of the multiple baffles and the conveyor belt.

[0005] Preferably, the material leveling block is inclined, and the side closest to the reversing roller is the inclined lower end.

[0006] Preferably, a first magnet is provided below the conveyor belt below the material leveling block. The first magnet is fixed on the mounting frame and is located near the inner surface of the upward-facing section of the conveyor belt.

[0007] Preferably, a U-shaped support frame is also provided on the outside of the impurity hopper, with the top of the support frame located between the impurity hopper and the conveyor belt; a scraper and a cleaning brush that slide in contact with the surface of the conveyor belt are arranged side by side on the top of the support frame; the scraper is located on the side closer to the discharge chute.

[0008] Preferably, the bottom of the scraper is provided with two longitudinally symmetrical sliding rods, and the top of the support frame is provided with two longitudinally symmetrical sliding holes. The sliding rods and sliding holes are slidably inserted into each other. Each of the two sliding holes is also provided with a spring. One end of the spring is fixed to the bottom wall of the sliding hole, and the other end is sleeved on the outside of the sliding rod and connected to the bottom of the scraper. The length of the sliding rod is less than the depth of the sliding hole.

[0009] Preferably, a vibrating column is provided between the scraper and the reversing roller. The vibrating column has a triangular prism structure and a rotating shaft is provided at the central axis of the vibrating column. The two ends of the rotating shaft are rotatably connected to the mounting frame. The vibrating column is pressed on the inner surface of the downward-facing section of the conveyor belt.

[0010] Preferably, the side edges and corners of the vibrating column are rounded, and the surface of the vibrating column is provided with a frosted layer.

[0011] Preferably, a second magnet is provided between the vibrating column and the reversing roller. The second magnet is fixed on the mounting frame and is located near the inner surface of the downward-facing section of the conveyor belt.

[0012] The belt conveyor for iron removal from raw coal provided by this utility model removes iron impurities from raw coal by installing a full circle of permanent magnets and a matching second magnet in the reversing drum of the original belt conveyor, using their magnetic adsorption force. The design is scientific, and the magnetic iron impurity separation effect is good, improving the iron removal efficiency. It also protects the subsequent crusher and other equipment, avoiding damage and wear to the equipment, and improving the coal washing efficiency and the operational stability of the coal washing process.

[0013] The adjustable height material distribution blocks and baffles on this belt conveyor make the raw coal on the conveyor belt thinner and more uniform. At the same time, the first magnet attracts iron impurities closer to the surface of the conveyor belt when the coal blocks are dispersed. This avoids the problem of iron impurities being difficult to attract and incompletely removed due to the thickness of the coal blocks. It also allows iron impurities to be attracted to the surface of the conveyor belt more quickly and firmly when they are transported to the reversing roller, thus increasing the iron removal efficiency and effect of the permanent magnet.

[0014] This belt conveyor uses cleaning brushes and scrapers that elastically contact the conveyor belt, along with vibrating columns, to remove small iron impurities or coal particles adhering to the surface of the conveyor belt, making the conveyor belt surface cleaner and ensuring the magnetic iron removal effect in the next rotation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a belt conveyor for removing iron from raw coal, provided in one embodiment of the present invention.

[0017] Figure 2 for Figure 1 A sectional view along the AA direction;

[0018] Figure 3 A schematic diagram of the structure of a belt conveyor for removing iron from raw coal provided in another embodiment of this utility model;

[0019] Figure 4 for Figure 3 BB direction sectional view;

[0020] Figure 5 for Figure 4 Enlarged view of point C.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Conveyor belt, 2-Drive roller, 3-Reversing roller, 4-Permanent magnet, 5-Feeding chute, 6-Impurity hopper, 11-Support rod, 12-Screw hole, 13-Top plate, 14-Equalizing block, 15-Block, 16-First magnet, 17-Vibrating column, 18-Second magnet, 171-Rotating shaft, 191-Support frame, 192-Scraper, 193-Cleaning brush, 194-Slide rod, 195-Slide hole, 196-Spring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are also within the protection scope of this utility model.

[0024] Example 1

[0025] like Figure 1 and Figure 2 This utility model provides a belt conveyor for removing iron from raw coal, comprising: a conveyor belt 1 mounted on a mounting frame (conventional configuration, not shown in the attached drawings); a drive roller 2 and a reversing roller 3 respectively wound around both ends of the conveyor belt 1; the drive roller 2 and the reversing roller 3 are arranged relatively parallel to each other, and the side closer to the drive roller 2 is the feed end of the conveyor belt 1; one end of the drive roller 2 is connected to the output end of a drive motor (conventional configuration, not shown in the attached drawings); a full circle of permanent magnets 4 is installed on the inner wall of the reversing roller 3; and a discharge point is provided below the end of the conveyor belt 1 near the reversing roller 3. The trough 5, near the drive drum 2, has an impurity hopper 6 on its side wall; the edge of the impurity hopper 6 does not exceed the central axis of the reversing drum 3; two symmetrical support rods 11 are provided on both sides of the middle of the mounting frame, and the two support rods 11 have multiple screw holes 12 in the vertical direction. The two support rods 11 are connected to a top plate 13 by bolts, and the height of the top plate 13 is adjustable; a material equalization block 14 is connected below the top plate 13, and multiple baffles 15 are evenly connected to the bottom of the material equalization block 14. The bottom of the multiple baffles 15 and the conveyor belt 1 have a gap smaller than the particle size of the raw coal.

[0026] Raw coal mined from the mine is transported to the raw coal storage yard via a conveyor system. From there, the coal is fed into a belt conveyor by a feeder in the receiving pit, and then transported to the preparation workshop for screening. After screening by a grading screen, smaller coal lumps (e.g., <50mm) fall onto the raw coal inlet belt conveyor and are fed into a hydrocyclone for separation. Larger coal lumps (e.g., >50mm) are manually separated by the belt conveyor of this invention to remove large pieces of gangue and iron impurities. Further iron removal is achieved using a permanent magnet 4. The coal is then fed into a crusher, crushed to a suitable particle size (e.g., <50mm), and finally sent back to the raw coal inlet belt conveyor.

[0027] In operation, the conveyor belt of this invention feeds raw coal into the conveyor belt 1 from the feed end. Driven by the drive roller 2, the conveyor belt 1 moves towards the reversing roller 3. When passing the equalizing block 14, the coal is pushed and spread more evenly on the conveyor belt 1 by the baffle 15, which makes the iron impurities more evenly distributed and easier to remove. Due to the presence of the permanent magnet 4, the outer wall of the reversing roller 3 has a strong magnetic attraction force. When the coal is transported to the reversing roller 3, the coal and iron impurities can be separated. When the non-magnetic coal moves to the end of the conveyor belt 1, it will fall directly into the discharge chute 5 along a horizontal parabolic trajectory. The magnetic iron impurities are attracted to the conveyor belt 1 and continue to rotate until they rotate to the downward section of the belt away from the discharge chute 5. As they move away from the permanent magnet 4, the attraction force decreases and they automatically fall off and enter the impurity hopper 6. Because the raw coal and iron impurities fall at different positions, the separation of raw coal and iron impurities is achieved. By installing a permanent magnet with magnetic adsorption force in the reversing drum 3, iron impurities in the raw coal can be effectively removed, protecting the subsequent crusher and other equipment from damage and wear. This also improves the iron removal effect at the belt conveyor, increasing iron removal efficiency and enhancing coal washing efficiency and operational stability. The installation method of the bolt holes 12 on the support rod 11 and the bolts on the top plate 13 is a standard configuration in this field and is not specifically limited here.

[0028] Example 2

[0029] Based on the above embodiments, this embodiment further includes: the uniform material block 14 is inclined, with the side closest to the reversing roller 3 being the inclined lower end. The position of the top plate 13 on the support rod 11 is adjustable, making the height of the uniform material block 14 and the baffle rod 15 above the conveyor belt 1 also adjustable, which can be adjusted according to the required coal particle size. To avoid excessively thick coal accumulation on the conveyor belt 1, resulting in incomplete removal of iron impurities, the inclined uniform material block 14 and baffle rod 15 work together to thin the coal, making the raw coal on the conveyor belt 1 thinner and more uniform. This avoids the problem of poor adsorption and incomplete removal of iron impurities due to excessively thick coal, increasing the iron removal efficiency and effect of the permanent magnet 4.

[0030] like Figure 3 Furthermore, a first magnet 16 is installed below the conveyor belt 1 below the material leveling block 14. The first magnet 16 is fixed on the mounting frame and is close to the inner surface of the upward-facing section of the conveyor belt 1. The first magnet 16 is also magnetic. When the material leveling block 14 and the baffle 15 work together to disperse the coal, the first magnet 16 can attract iron impurities to a position closer to the surface of the conveyor belt 1. This allows the iron impurities to be attracted to the surface of the conveyor belt 1 more quickly and firmly when transported to the reversing roller 3, thereby increasing the removal effect of iron impurities.

[0031] Example 3

[0032] like Figure 3 and Figure 4 Based on the above embodiments, this embodiment further includes: a U-shaped support frame 191 is provided on the outside of the impurity hopper 6, the top of the support frame 191 is located between the impurity hopper 6 and the conveyor belt 1; a scraper 192 and a cleaning brush 193 are arranged side by side and parallel to each other on the top of the support frame 191, which slide in contact with the surface of the conveyor belt 1; the scraper 192 is arranged on the side closer to the discharge trough 5.

[0033] The scraper 192 and cleaning brush 193 allow iron impurities on the conveyor belt 1 to quickly fall into the impurity hopper 6 during the conveying process. Simultaneously, they remove small iron impurities or coal particles adhering to the surface of the conveyor belt 1, resulting in a cleaner surface and ensuring effective magnetic iron removal in the next cycle. The scraper 192 and cleaning brush 193 have different hardness levels; their combined use allows for more effective and thorough removal of adhering substances, resulting in a better cleaning effect.

[0034] like Figure 5 Furthermore, the bottom of the scraper 192 is symmetrically provided with two sliding rods 194, and the top of the support frame 191 is symmetrically provided with two sliding holes 195. The sliding rods 194 and the sliding holes 195 are slidably inserted into each other in a one-to-one correspondence. Each of the two sliding holes 195 is also provided with a spring 196. One end of the spring 196 is fixed to the bottom wall of the sliding hole 195, and the other end is sleeved on the outside of the sliding rod 194 and connected to the bottom of the scraper 192. The length of the sliding rod 194 is less than the depth of the sliding hole 195.

[0035] To prevent the relatively hard scraper 192 from scratching the surface of the conveyor belt 1, the scraper 192 is kept in elastic contact with the surface of the conveyor belt 1 by the coordinated use of spring 196, sliding hole 195, and sliding rod 194. This ensures that the scraper 192, under the elastic support of spring 196, will always be in elastic contact with the surface of the conveyor belt 1, removing impurities without scratching the surface. The sliding rod 194 is inserted into the sliding hole 195 and mainly serves to limit the movement of spring 196, allowing the scraper 192 to move vertically.

[0036] Example 4

[0037] like Figure 3 and Figure 4 Based on the above embodiments, this embodiment further includes: a vibrating column 17 is provided between the scraper 192 and the reversing roller 3. The vibrating column 17 is a triangular prism structure. A rotating shaft 171 is provided at the central axis of the vibrating column 17. The two ends of the rotating shaft 171 are rotatably connected to the mounting frame. The vibrating column 17 is pressed on the inner surface of the downward-facing section of the conveyor belt 1.

[0038] The vibrating column 17 is pressed onto the conveyor belt 1. When the conveyor belt 1 rotates, the friction between the two drives the vibrating column 17 to rotate as well. Since the vibrating column 17 is a triangular prism structure, its side edges and sides alternately contact the conveyor belt 1. The conveyor belt 1 will vibrate up and down during its rotation. Combined with the cleaning of the scraper 192 and the cleaning brush 193, the magnetic iron impurities and other impurities attached to the surface of the conveyor belt 1 can be quickly and thoroughly removed into the impurity hopper 6.

[0039] Furthermore, the side edges and corners of the vibrating column 17 are rounded, and the surface of the vibrating column 17 is provided with a frosted layer. The rounded side edges and corners can prevent damage to the conveyor belt 1 during friction and rotation, while the frosted layer can increase the friction between the vibrating column 17 and the conveyor belt 1, ensuring that the vibrating column 17 can rotate with the movement of the conveyor belt 1 and preventing it from slipping.

[0040] Example 5

[0041] like Figure 3 Based on the above embodiments, this embodiment further includes: a second magnet 18 is provided between the vibrating column 17 and the reversing roller 3. The second magnet 18 is fixed on the mounting frame and is close to the inner surface of the downward-facing section of the conveyor belt 1. The second magnet 18 is also magnetic, which ensures that magnetic iron impurities can fall into the impurity hopper 6 at a greater distance from the discharge trough 5 due to the loss of magnetic attraction, thus preventing iron impurities from falling into the discharge trough 5.

[0042] In summary, the belt conveyor for removing iron from raw coal of this utility model, during operation, allows raw coal lumps to enter the conveyor belt 1 from the feed end. Driven by the drive roller 2, as the conveyor belt 1 moves towards the reversing roller 3, the coal lumps are pushed and spread more evenly on the conveyor belt 1 by the baffle 15 when passing the equalizing block 14, which makes the iron impurities more evenly distributed. At the same time, the first magnet 16 can attract the iron impurities to a position closer to the surface of the conveyor belt 1, so that when the iron impurities are transported to the reversing roller 3, they can be attracted to the surface of the conveyor belt 1 more quickly and firmly, and can be removed more conveniently and thoroughly.

[0043] Due to the presence of the permanent magnet 4, the outer wall of the reversing drum 3 has a strong magnetic attraction force. When the coal block is transported to the reversing drum 3, the coal block and iron impurities can be separated. When the non-magnetic coal block moves to the end of the conveyor belt 1, it will fall directly into the feed chute 5 along a horizontal parabolic trajectory. The magnetic iron impurities are attracted to the conveyor belt 1 by the permanent magnet 4 and the second magnet 18 and continue to rotate until they rotate to the downward section of the belt away from the feed chute 5. As they move away from the permanent magnet 4 and the second magnet 18, the attraction force decreases and they automatically fall off and enter the impurity hopper 6. Since the raw coal block and the iron impurities fall at different positions, the separation of raw coal and iron impurities is achieved.

[0044] As the conveyor belt 1 continues to rotate, the triangular prism structure vibrating column 17 pressed on the inner surface of the downward section of the conveyor belt 1 also rotates, causing the conveyor belt 1 to vibrate up and down during its rotation. At the same time, the scraper 192 and cleaning brush 193, which are in elastic contact with the surface of the conveyor belt 1, remove small iron impurities or coal particles attached to the surface of the conveyor belt 1, making the surface of the conveyor belt 1 cleaner and ensuring the magnetic iron removal effect in the next rotation.

[0045] It should be noted that in this utility model, the installation, connection, or setting methods of all the components described above are common mechanical methods, and the specific structure, model, and coefficient indicators of all components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be described in detail. Furthermore, the belt conveyor of this utility model is equipped with conventional belt tensioning mechanisms, anti-deviation mechanisms, etc., which will also not be described in detail here.

[0046] It should be noted that the detailed structure of some devices in this utility model is not described in detail, but belongs to the prior art known to those skilled in the art, and therefore will not be described again here. In addition, the parts of this device not described are the same as or can be implemented using existing technology.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A belt conveyor for removing iron from raw coal, characterized in that, include: A conveyor belt mounted on a mounting frame has a drive roller and a reversing roller wound around its two ends, respectively. The drive roller and the reversing roller are arranged parallel to each other, with the feed end of the conveyor belt located closer to the drive roller. One end of the drive roller is connected to the output end of a drive motor, and a full circle of permanent magnets is installed on the inner wall of the reversing roller. A discharge chute is located below the end of the conveyor belt near the reversing roller, and an impurity hopper is located next to the discharge chute near the drive roller. The edge of the impurity hopper does not extend beyond the central axis of the reversing roller. Two symmetrical support rods are located on both sides of the middle of the mounting frame. The two support rods have multiple screw holes in the vertical direction, and a top plate is bolted between the two support rods. The height of the top plate is adjustable. A material leveling block is connected below the top plate, and multiple baffles are evenly connected to the bottom of the material leveling block. A gap smaller than the particle size of the raw coal is left between the bottom of the baffles and the conveyor belt.

2. The belt conveyor for iron removal from raw coal according to claim 1, characterized in that, The material leveling block is inclined, and the side closest to the reversing roller is the inclined lower end.

3. The belt conveyor for iron removal from raw coal according to claim 1, characterized in that, A first magnet is provided below the conveyor belt below the material leveling block. The first magnet is fixed on the mounting frame and is located near the inner surface of the upward-facing section of the conveyor belt.

4. The belt conveyor for iron removal from raw coal according to any one of claims 1-3, characterized in that, A U-shaped support frame is also provided on the outside of the impurity hopper, with the top of the support frame located between the impurity hopper and the conveyor belt; a scraper and a cleaning brush are arranged side by side on the top of the support frame, which slide in contact with the surface of the conveyor belt; the scraper is located on the side closer to the discharge chute.

5. The belt conveyor for iron removal from raw coal according to claim 4, characterized in that, The scraper has two longitudinally symmetrical sliding rods at its bottom, and the support frame has two longitudinally symmetrical sliding holes at its top. The sliding rods are slidably inserted into the sliding holes one by one. Each of the two sliding holes is also equipped with a spring. One end of the spring is fixed to the bottom wall of the sliding hole, and the other end is sleeved on the outside of the sliding rod and connected to the bottom of the scraper. The length of the sliding rod is less than the depth of the sliding hole.

6. The belt conveyor for iron removal from raw coal according to claim 4, characterized in that, A vibrating column is provided between the scraper and the reversing roller. The vibrating column has a triangular prism structure. A rotating shaft is provided at the central axis of the vibrating column. The two ends of the rotating shaft are rotatably connected to the mounting frame. The vibrating column is pressed against the inner surface of the downward-facing section of the conveyor belt.

7. The belt conveyor for iron removal from raw coal according to claim 6, characterized in that, The vibrating column has rounded edges and corners, and its surface is covered with a frosted layer.

8. The belt conveyor for iron removal from raw coal according to claim 6, characterized in that, A second magnet is also provided between the vibrating column and the reversing roller. The second magnet is fixed on the mounting frame and is close to the inner surface of the downward-facing section of the conveyor belt.

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