A high-efficiency grinding device for a coal mill

Abstract

This invention relates to the field of vertical coal mill technology, and more particularly to a high-efficiency grinding device for a coal mill, comprising: a coal mill, the coal mill including grinding rollers, a fixing frame for fixing the grinding rollers, a grinding disc that cooperates with the grinding rollers for grinding, an air ring disposed outside the grinding disc for blowing up coal powder, and a dust collection device disposed above the coal mill for collecting coal powder in the airflow; a grinding mechanism disposed inside the coal mill for grinding coal lumps, the grinding mechanism including a crushing unit for crushing coal lumps and a grinding unit for crushing the crushed small coal lumps; a separation mechanism disposed below the crushing components for separating coal powder and fly ash; and a sealing mechanism disposed on the side wall of the coal mill for sealing the grinding roller door. This invention solves the technical problem of rapid wear of the grinding rollers.

Description

Technical Field

[0001] This invention relates to the field of vertical coal mill technology, and more particularly to a high-efficiency grinding device for a coal mill. Background Technology

[0002] The vertical coal mill adopts the most advanced dynamic and static combined separator, which has high classification efficiency, large adjustment range, and powder fineness can reach less than 3% sieve residue of 0.08mm. It can meet the fineness requirements of most low-quality coal or anthracite coal grinding in cement production lines. The advanced grinding method makes its energy consumption 30% to 40% lower than that of ball mill.

[0003] Patent document CN218689958U discloses a wear-resistant vertical coal mill, belonging to the technical field of vertical coal mills. The key technical points of the solution include a feeding hopper, in which a feeding disc is fixedly installed. The upper end face of the feeding disc has three evenly distributed feeding holes. A rotating shaft is movably installed through the middle of the upper end face of the feeding disc. Three evenly distributed push plates are fixedly connected to the outer wall of the rotating shaft.

[0004] However, in actual use, as production time increases, the powder output efficiency and grinding precision gradually decrease. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by setting up a grinding mechanism and a separation mechanism to reduce the abnormal damage to the grinding roller caused by large abrasive particles and remove flying sand, thereby slowing down the wear of the grinding roller and improving its service life, thus solving the technical problem of rapid wear of the grinding roller.

[0006] To address the above technical issues, the following technical solution is adopted: A high-efficiency grinding device for a coal mill, comprising: A coal mill, comprising a grinding roller, a fixing frame for fixing the grinding roller, a grinding disc that cooperates with the grinding roller for grinding, an air ring disposed outside the grinding disc for blowing up coal powder, and a dust collection device disposed above the coal mill for collecting coal powder in the airflow. A grinding mechanism is provided inside a coal mill and is used to grind coal blocks. The grinding mechanism includes a crushing unit for crushing the coal blocks and a grinding unit for crushing the crushed small coal blocks. A separation mechanism is disposed below the crushing assembly and is used to separate pulverized coal from fly ash; A sealing mechanism is provided on the side wall of the coal mill and is used to seal the grinding roller door.

[0007] Preferably, the crushing unit is located below the feed inlet of the coal mill and includes a crushing roller for crushing large coal blocks into smaller blocks, a distribution bin located below the crushing roller, a filter disc located below the powder bin and located in the middle of the powder bin, a conveying pipe located below the filter disc and fixedly connected to the center of the mill disc, and a sorting pipe located below the filter disc and connected to the separation mechanism.

[0008] Preferably, the grinding unit includes a steering component disposed on the grinding roller and used to drive the grinding roller to turn, a crushing component disposed on the inner side of the grinding roller and used to assist the grinding roller in grinding, and a dispersing component disposed on the outer side of the grinding roller and used to disperse the cake-shaped coal powder.

[0009] Preferably, the steering assembly includes a rotating frame that fixes the rotating shaft of the grinding roller, a steering knuckle that is horizontally rotatably connected to the upper end of the rotating frame and vertically provided with a spring between the rotating frame and the rotating frame, and the upper end of the steering knuckle is vertically rotatably connected to the fixed frame and driven to rotate vertically by a motor.

[0010] Preferably, the steering assembly further includes an isolation rod disposed inside the grinding roller and a movable component disposed on one side of the circumference of the grinding roller; The movable components include a slide bar fixed to a fixed frame, a lifting frame vertically slidably connected to the slide bar, and a conveyor belt disposed below the lifting frame.

[0011] Preferably, the crushing assembly includes a pressure ring disposed inside the rotating frame and multiple sets of pressure components evenly disposed along the edge of the grinding roller. The pressure components include a control plate rotatably connected to the grinding roller and rotating via a worm gear, a push rod slidably connected to the control plate, and a pressure plate disposed at the lower end of the push rod.

[0012] Preferably, the dispersion component is provided in multiple sets and is evenly arranged on the outer side of the grinding roller along the center of the grinding roller. It includes a filter groove fixedly connected to the grinding roller, a sliding groove fixedly connected to the grinding roller, a moving block slidably connected to the sliding groove, and a friction plate hinged to the outer end of the moving block and arranged inside the filter groove. The friction plate is driven to rotate and the moving block is driven to move by a gear and rack transmission method.

[0013] Preferably, the separation mechanism includes a separation tank located below the sorting tube, a stirring blade actively connected to the middle of the separation tank and driven by a motor, a flow pool located at the bottom of the separation tank and connected to the separation tank, an inclined filter screen located outside the separation tank and connected to the flow pool, a drying box located outside the inclined filter screen, and a discharge port located outside the drying box with a desiccant and an air hole located below the inclined filter screen.

[0014] Preferably, the sealing mechanism includes a swinging component and a sealing component. The swinging component includes a swing rod disposed inside the grinding roller door and used to control the fixed frame, a swing ball disposed in the middle of the swing rod, an isolation baffle disposed around the swing ball and in contact with the swing ball, and two sets of isolation rings symmetrically disposed on both sides of the isolation baffle.

[0015] As another preferred embodiment, the sealing element is respectively disposed on the outside of the two sets of isolation rings, including three sets of heat insulation cotton arranged in different forms. The first heat insulation cotton includes multiple sets folded and disposed on the outside of the swing rod in a direction perpendicular to the swing rod. The second heat insulation cotton surrounds the swing rod and is disposed on the outside of each set of first heat insulation cotton. The third heat insulation cotton includes multiple sets and is disposed in the gaps of the second heat insulation cotton. Each set of first heat insulation cotton has an elastic element in the middle. The third heat insulation cotton has a sliding rod on the outside and the sliding rod is slidably connected to the side wall of the device by a spring.

[0016] The beneficial effects of this invention are: (1) In this invention, by setting up a crushing unit, the abrasive in the input device is crushed once and then fed into the grinding disc for subsequent grinding. In this way, the abrasive that the grinding roller comes into contact with is a small piece of crushed abrasive, which reduces the excessive damage caused by the grinding roller grinding large pieces of abrasive, and helps to ensure the stable operation and service life of the device. (2) In this invention, by setting a steering component, the grinding roller can adjust its angle according to the size of the abrasive to be ground, so that the grinding of larger pieces of material can be completed through the circumferential surface of the grinding roller, preventing the back-and-forth rolling and abnormal wear on the side of the grinding roller caused by the smaller pieces of material not being able to enter the bottom of the grinding roller. (3) In this invention, the dispersion component is used to disperse the cake material. This addresses the issue that the abrasive may carry moisture, causing powder to stick together. As a result, the cake material cannot be output from the device or dispersed again by the grinding roller, causing the cake material to accumulate in the device and affecting the powder output efficiency. (4) In this invention, by setting a sealing mechanism, by setting a swinging part and a sealing part, the grinding roller door is sealed. On the one hand, the swinging part ensures that the swinging rod can swing well and will not affect the normal long grinding work. On the other hand, by setting multiple sets of heat insulation cotton, the inside and outside of the device are sealed, reducing system air leakage and reducing system energy consumption. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a high-efficiency grinding device for a coal mill.

[0019] Figure 2 This is a schematic diagram of the crushing unit.

[0020] Figure 3 This is a schematic diagram of the grinding unit.

[0021] Figure 4 This is a schematic diagram of the steering assembly.

[0022] Figure 5 This is a schematic diagram of the crushing component.

[0023] Figure 6 This is a schematic diagram of the working state of the crushing component.

[0024] Figure 7 This is a schematic diagram of the structure of the distributed component.

[0025] Figure 8 This is a schematic diagram showing the direction of motion of the dispersed components.

[0026] Figure 9 This is a schematic diagram of the separation mechanism.

[0027] Figure 10 This is a schematic diagram of the sealing mechanism.

[0028] Figure 11 This is a schematic diagram of the sealing element. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] Example 1 like Figure 1 As shown, a high-efficiency grinding device for a coal mill includes: The coal mill 1 includes a grinding roller 11, a fixing frame 12 for fixing the grinding roller 11, a grinding disc 13 that cooperates with the grinding roller 11 for grinding, an air ring 14 disposed outside the grinding disc 13 for blowing up coal powder, and a dust collection device 15 disposed above the coal mill 1 for collecting coal powder in the airflow. Grinding mechanism 2, which is installed inside coal mill 1 and is used to grind coal blocks, includes crushing unit 21 for crushing coal blocks and grinding unit 22 for crushing small coal blocks after crushing. Separation mechanism 3, which is located below the crushing component and is used to separate coal powder and fly sand; A sealing mechanism 4 is provided on the side wall of the coal mill 1 and is used to seal the door of the grinding roller 11.

[0031] In this embodiment, the grinding mechanism 2 and the separation mechanism 3 are respectively set to assist the grinding work of the grinding roller 11, while reducing the impact of flying sand on the grinding, thereby slowing down the wear of the grinding roller 11 and extending the service life of the grinding roller 11.

[0032] In detail, the grinding component is an important part of the vertical mill. The material is crushed into finished product through the grinding device and then classified by the classifier. The grinding device mainly refers to the area formed by the roller sleeve of the grinding roller 11 and the liner of the grinding disc 13. Therefore, the cooperation between the roller sleeve and the disc liner plays an important role in the output of the mill. In daily use, the grinding roller 11 is the grinding component in the coal mill 1, and the degree of wear is related to the fineness of the abrasive after grinding and the powder output efficiency. When the grinding roller 11 is worn, the gap between the grinding roller 11 and the grinding disc 13 becomes larger, causing larger particles of powder to pass through the grinding roller 11. At this time, if you want to grind powder with better fineness, you need to grind repeatedly, which further increases the wear on the grinding roller 11. After grinding, the fineness of the powder becomes worse and the powder output efficiency will gradually decrease.

[0033] It should be noted that, regarding the wear of the grinding roller 11, in addition to the normal wear during grinding of the abrasive, there is also abnormal wear caused by the excessive volume of the abrasive and the flying sand on the surface of the grinding roller 11. Since the grinding roller 11 is inclined and set at the edge of the grinding disc 13, when the abrasive moves on the grinding disc 13 due to centrifugal force, it will move from the inside of the grinding roller 11 to the bottom of the grinding roller 11 for grinding. When there is a large volume of abrasive, the abrasive cannot enter the bottom of the grinding roller 11 from the side, so the grinding roller 11 cannot directly crush the abrasive. Instead, the abrasive stays on the side of the grinding roller 11, and the grinding roller 11 rubs against the abrasive. The abrasive scratches the grinding roller 11, and the grinding roller 11 cannot achieve effective grinding. At the same time, the stagnant large volume of abrasive will prevent small volume abrasive from entering the bottom of the grinding roller 11, reducing the powder output efficiency.

[0034] Secondly, the amount of fly sand in front of the cement production line is relatively large, which can easily cause a large amount of high-temperature fly sand to enter the coal mill 1. Because the density of high-temperature fly sand is much greater than that of coal powder, a large amount of fly sand remains at the bottom of the grinding disc 13 of the coal mill 1 and cannot exit the mill, thereby reducing the grinding efficiency of the coal mill 1. The residue of fly sand will also accelerate the wear of the grinding roller 11.

[0035] Therefore, the grinding mechanism 2 and the separation mechanism 3 are set up to assist the grinding roller 11 in grinding and to reduce the impact of flying sand on the grinding roller 11.

[0036] Furthermore, such as Figure 2As shown, the crushing unit 21 is located below the feed inlet of the coal mill 1, and includes a crushing roller 211 for crushing large coal blocks into smaller blocks, a distribution bin 212 located below the crushing roller 211, a filter disc 215 located below the powder bin and located in the middle of the powder bin, a conveying pipe 214 located below the filter disc 215 and fixedly connected to the center of the grinding disc 13, and a sorting pipe 216 located below the filter disc 215 and connected to the separation mechanism 3.

[0037] In this embodiment, the crushing of large abrasive particles is achieved by setting the crushing roller 211 and the filter disc 215, while the large abrasive particles are separated from the fly sand.

[0038] In detail, the abrasive falls from the feed inlet of the coal mill 1 into the middle of the crushing roller 211. Large pieces of abrasive are crushed into smaller pieces by the crushing roller 211 and continue to fall onto the filter disc 215 in the middle of the distribution bin 212. At this time, the filter disc 215 rotates along with the grinding disc 13. Powder, small particles of abrasive, and fly sand fall together through the filter disc 215 into the classification pipe 216 and enter the separation mechanism 3 for separation. The larger particles of abrasive after crushing leave the filter disc 215 under the action of centrifugal force and enter the conveying pipe 214, falling onto the grinding disc 13 for secondary crushing.

[0039] It should be noted that large-volume abrasives cannot be directly fed into the underside of the grinding roller 11 from the side, which can easily cause excessive wear on the surface of the grinding roller 11. Therefore, it is necessary to pre-crush large-volume abrasives to avoid repeated grinding of large pieces of abrasive, which would exacerbate the wear of the grinding roller 11. The abrasive is ground in one pass by the crushing roller 211. The purpose of the crushing roller 211 is only to crush large pieces of abrasive into smaller pieces. It will not affect the powder and small particles carried by the abrasive during output, thus avoiding abrasive accumulation. At the same time, for the crushing roller 211 used for this purpose, the wear it receives has virtually no impact on the grinding operation of the abrasive and it can be used for a relatively long time.

[0040] It is worth mentioning that the filter disc 215 is used to separately transport small particles of fly sand and abrasive to the separation pipe for separation, while large particles of abrasive fall into the grinding disc 13, without affecting the normal output efficiency of the mill.

[0041] Furthermore, such as Figure 3 As shown, the grinding unit 22 includes a steering component 221 disposed on the grinding roller 11 and used to drive the grinding roller 11 to rotate, a crushing component 222 disposed on the inner side of the grinding roller 11 and used to assist the grinding roller 11 in grinding, and a dispersing component 223 disposed on the outer side of the grinding roller 11 and used to disperse the cake-shaped coal powder.

[0042] In this embodiment, by setting the steering component 221, the crushing component 222 and the dispersing component 223, the grinding of the grinding roller 11 is assisted from three angles.

[0043] In detail, by utilizing the steering assembly 221, when the grinding roller 11 rotates following the grinding disc 13, and larger abrasive particles move into the grinding area, the steering assembly 221 causes the grinding roller 11 to rotate, so that the circumferential surface of the grinding roller 11 faces the larger abrasive particles, allowing the abrasive particles to be directly crushed by the circumferential surface of the grinding roller 11. On the one hand, by having the circumferential surface of the grinding roller 11 directly grind the abrasive, the grinding effect of the abrasive is improved, and the larger abrasive particles are quickly crushed. On the other hand, it protects the grinding roller 11, preventing the larger abrasive particles from continuously rolling and causing abnormal damage to the edges of the grinding roller 11 because they cannot enter the bottom of the grinding roller 11 from the side.

[0044] The crushing component 222 is set up to crush the abrasive before it enters the bottom of the grinding roller 11. The crushing prevents sharp parts of the abrasive from directly contacting the grinding roller 11. The crushing also crushes the abrasive before it enters the grinding roller 11 and keeps the abrasive at a certain uniform thickness, so as to avoid excessive abrasive accumulation in some areas, which would prevent it from being fully ground during grinding.

[0045] The purpose of setting up the dispersion component 223 is to disperse the cake-like material when there is a certain amount of moisture in the abrasive. The cake-like material is easily agglomerated after grinding and forms a cake-like material. The cake-like material is simply blown up by the air ring 14, and the cake-like material cannot be dispersed by the grinding roller 11. Therefore, the dispersion component 223 is set up to disperse the cake-like material that may exist and prevent the cake-like material from accumulating.

[0046] Furthermore, such as Figure 4 As shown, the steering assembly 221 includes a rotating frame 2211 that fixes the rotating shaft of the grinding roller 11, a steering knuckle 2212 that is horizontally rotatably connected to the upper end of the rotating frame 2211 and vertically provided with a spring between the rotating frame 2211 and the upper end of the steering knuckle 2212 is vertically rotatably connected to the fixed frame 12 and is driven to rotate vertically by a motor.

[0047] In this embodiment, by setting the steering knuckle 2212 and the rotating frame 2211, the grinding roller 11 can rotate at a certain angle in two directions along the rotation axis of the steering knuckle 2212 and the rotating frame 2211, in coordination with the operation of the grinding roller 11.

[0048] In detail, by setting up a rotating frame 2211, which is used to fix the grinding roller 11 and is fixed on the steering knuckle 2212, when abrasive is filled under the grinding roller 11, the grinding roller 11 will inevitably be raised. By setting up the rotating frame 2211, when too much material is filled under the grinding roller 11, the grinding roller 11 can rotate in the horizontal direction, preventing the abrasive from not being completely filled under the grinding roller 11 and causing abrasive accumulation. At the same time, it reduces the vibration of the grinding roller 11 caused by the thickness of the abrasive, prevents wear and vibration, and transmits the vibration to the fixed frame 12, reducing the sealing pressure of the subsequent sealing mechanism 4.

[0049] A steering knuckle 2212 is provided so that the grinding roller 11 can rotate in the vertical direction, that is, adjust the relative angle between the grinding roller 11 and the grinding disc 13 so that when the grinding roller 11 moves relative to the grinding disc 13, the front part of the grinding roller 11 rotates inward, thereby causing the circumferential side of the grinding roller 11 to directly crush the abrasive.

[0050] Furthermore, such as Figure 4 As shown, the steering assembly 221 also includes an isolation rod 2213 disposed inside the grinding roller 11 and a movable part 2214 disposed on one side of the circumference of the grinding roller 11; The movable component 2214 includes a slide bar 2215 fixed on the fixed frame 12, a lifting frame 2216 vertically slidably connected to the slide bar 2215, and a conveyor belt 2217 disposed below the lifting frame 2216.

[0051] In this embodiment, by setting up a lifting frame 2216 that can slide up and down and a conveyor belt 2217, the movement of large pieces of material is realized, so that the large pieces of material can be moved to the front of the grinding roller 11 and directly crushed by the circumferential surface of the grinding roller 11.

[0052] In detail, as the grinding disc 13 rotates, the abrasive material moves towards the edge of the grinding disc 13 due to centrifugal force. Small particles can move normally from below the isolation rod 2213 towards the edge of the grinding disc 13 and then enter the area below the grinding roller 11 for grinding. Larger pieces of abrasive material are intercepted by the isolation rod 2213 and move outward along the isolation rod 2213, eventually reaching below the conveyor belt 2217. After moving below the conveyor belt 2217, the larger pieces of abrasive material continue to move outward under the action of the conveyor belt 2217. Meanwhile, the conveyor belt 2217 is lifted by the abrasive and rises along the slide bar 2215 on the lifting frame 2216. Contact switches are set on the slide bar 2215 and the lifting frame 2216. The contact switches can control the motor on the steering knuckle 2212, causing the steering knuckle 2212 to rotate, which in turn causes the grinding roller 11 to rotate. The outer end of the conveyor belt 2217 is located in front of the grinding roller 11 at this time. The conveyor belt 2217 brings the abrasive to the front of the grinding roller 11, so that the grinding roller 11 directly crushes the abrasive.

[0053] The abrasive is reclassified by the isolation rod 2213. In the crushing unit 21, the small abrasive particles and fly sand are separated by the filter disc 215 and enter the separation mechanism 3. The large abrasive particles are crushed into small pieces and fed into the grinding disc 13. Among the crushed abrasive particles, there are still slightly larger particles. The isolation rod 2213 is used for further separation. The abrasive particles of suitable size are normally fed from the side to the bottom of the grinding roller 11. The slightly larger particles are ground by the circumferential surface of the grinding roller 11, which further reduces abnormal wear on the grinding roller 11 and improves the service life of the grinding roller 11.

[0054] Furthermore, such as Figure 5 , Figure 6 As shown, the crushing assembly 222 includes a pressure ring 2221 disposed inside the rotating frame 2211 and multiple sets of pressure members 2222 evenly disposed along the edge of the grinding roller 11. The pressure member 2222 includes a control plate 2223 rotatably connected to the grinding roller 11 and rotating through a worm gear, a push rod 2224 slidably connected to the control plate 2223, and a pressure plate 2225 disposed at the lower end of the push rod 2224.

[0055] In this embodiment, by setting a pressure member 2222, the pressure plate 2225 is used to squeeze the abrasive material that is about to enter the grinding roller 11. The pressure plate 2225 is used to keep the abrasive material layer of uniform thickness and to avoid sharp parts on some abrasive surfaces, which would cause abnormal damage to the grinding roller 11.

[0056] In detail, the pressure component 2222 rotates with the grinding roller 11. When the pressure component 2222 rotates to the point before being lowered, the control plate 2223 is driven to rotate by the worm gear and rack, causing the control plate 2223, which is retracted inside the grinding roller 11, to rotate outward. At the same time, the upper end of the push rod 2224 contacts the pressure ring 2221 and gradually extends under the action of the pressure ring 2221, pressing down the pressure plate 2225, and using the pressure plate 2225 to squeeze the abrasive.

[0057] It should be noted that, regarding the fit between the grinding roller 11 and the grinding disc 13, there is still room to increase the actual wear area width of the roller sleeve. Increasing the wear area width increases the grinding area between the roller sleeve and the liner, thereby improving powder efficiency. After increasing the width of the grinding roller 11, the grinding disc 13 also needs to undergo corresponding welding to adjust the shape of the grinding disc 13 liner to match the grinding roller 11, keeping the groove depth of the grinding disc 13 constant to ensure the material layer thickness and stable equipment operation. After welding, the contact area between the grinding disc 13 and the grinding roller 11 increases, resulting in a significant improvement in grinding efficiency.

[0058] By using the pressure plate 2225, the wear area of ​​the grinding roller 11 can be widened to a certain extent. The rotation and downward pressure of the pressure plate 2225 can achieve a certain grinding effect on the abrasive. At the same time, the pressure plate 2225 makes the material layer more uniform and the abrasive directly fills more compactly, which is convenient for the grinding roller 11 and ensures the stable operation of the equipment.

[0059] Furthermore, such as Figure 7 , Figure 8 As shown, the dispersion component 223 is provided in multiple sets and is evenly arranged on the outer side of the grinding roller 11 along the center. It includes a filter groove 2231 fixedly connected to the grinding roller 11, a sliding groove 2232 fixedly connected to the grinding roller 11, a moving block 2233 slidably connected to the sliding groove 2232, and a friction plate 2234 hinged to the outer end of the moving block 2233 and arranged inside the filter groove 2231. The friction plate 2234 is driven to rotate and the moving block 2233 moves through a gear and rack transmission method.

[0060] In this embodiment, by setting up a filter tank 2231 and a friction plate 2234, the cake-shaped material is scraped into the middle of the filter tank 2231 and the friction plate 2234 for frictional separation, thereby reducing the occurrence of cake-shaped material.

[0061] In detail, the grinding roller 11 grinds the abrasive. Due to moisture, some powder adheres and forms a cake shape, which moves outward from the bottom of the grinding roller 11. The dispersing component 223 is evenly arranged on the grinding roller 11. As the grinding roller 11 rotates, the filter groove 2231 moves to the edge of the grinding disc 13. At the same time, when the filter groove 2231 moves to this position, the friction plate 2234 rotates, turning from close to the surface of the grinding roller 11 to adhering to the inside of the filter groove 2231. During this rotation, the cake-shaped material can be scraped into the filter groove 2231 and rotates upward with the grinding roller 11. At this time, the friction plate 2234 moves left and right relative to the filter plate. The cake-shaped material is located between the filter plate and the friction plate 2234. The movement of the friction plate 2234 disperses the cake-shaped material, and the dispersed powder falls through the filter disc 215.

[0062] It should be noted that for cake-shaped materials, due to their heavy weight, they cannot be blown away by the air ring 14 and therefore cannot be discharged from the device. Furthermore, having already undergone one grinding by the grinding roller 11, they cannot be dispersed again by the grinding roller 11. This causes cake-shaped materials to accumulate in the grinding disc 13, affecting the normal grinding process and slowing down the powder output efficiency. The cake-shaped materials are captured by the filter tank 2231, which has numerous filter holes. This not only does not affect the normal release of powder but also disperses the cake-shaped materials. When there are no cake-shaped materials, some small particles that have not been fully ground can also be ground back and forth by the friction plate 2234, improving the powder output effect.

[0063] Furthermore, such as Figure 9 As shown, the separation mechanism 3 includes a separation tank 31 located below the sorting tube 216, a stirring blade 32 actively connected to the middle of the separation tank 31 and driven by a motor, a flow pool 33 located at the bottom of the separation tank 31 and connected to the separation tank 31, an inclined filter screen 34 located outside the separation tank 31 and connected to the flow pool 33, a drying box 35 located outside the inclined filter screen 34, and a discharge port 36 located outside the drying box 35, with a desiccant and an air hole 37 located below the inclined filter screen 34 at the discharge port 36.

[0064] In this embodiment, by setting up a separation tank 31 and a drying box 35, fly sand and small abrasive particles are separated, and the separated lower abrasive particles are recycled back to the grinding disc 13 for further grinding.

[0065] In detail, the fly sand and abrasive fall into the separation tank 31, which is connected to the flow pool 33 at the bottom. Therefore, there is water in the separation tank 31. At the same time, the stirring blade 32 rotates. Since the fly sand has a higher density than the abrasive, the denser fly sand falls into the flow pool 33 below due to the stirring of the stirring blade 32. The less dense abrasive escapes from the separation tank 31 with the rotating water flow and enters the inclined filter screen. The water passes through the inclined filter screen 34, and the abrasive is filtered down by the filter screen and enters the drying box 35. After drying, it returns to the grinding disc 13 through the discharge port 36 for grinding.

[0066] It should be noted that, for the abrasive being filtered down by the inclined filter screen 34, an air hole 37 is provided at the bottom of the inclined filter screen 34. The air hole 37 and the air ring 14 use the same air source. Air is blown into the bottom of the inclined filter screen 34 through the air hole, and the abrasive on the inclined filter screen 34 is blown into the drying chamber by the air, while avoiding the abrasive clogging the inclined filter screen 34.

[0067] Furthermore, such as Figure 10 As shown, the sealing mechanism 4 includes a swinging member 41 and a sealing member 42. The swinging member 41 includes a swing rod 411 disposed inside the grinding roller 11 and used to control the fixed frame 12, a swing ball 412 disposed in the middle of the swing rod 411, an isolation baffle 413 disposed around the swing ball 412 and in contact with the swing ball 412, and two sets of isolation rings 414 symmetrically disposed on both sides of the isolation baffle 413.

[0068] Furthermore, such as Figure 11As shown, the sealing element 42 is respectively disposed on the outside of the two sets of isolation rings 414, including three sets of heat insulation cotton arranged in different forms. The first heat insulation cotton 421 includes multiple sets folded and disposed on the outside of the swing rod in a direction perpendicular to the swing rod 411. The second heat insulation cotton 422 surrounds the swing rod and is disposed on the outside of each set of first heat insulation cotton 421. The third heat insulation cotton 423 includes multiple sets and is disposed in the gaps of the second heat insulation cotton 422. Each set of first heat insulation cotton 421 is provided with an elastic element in the middle. The third heat insulation cotton 423 is provided with a sliding rod on the outside and the sliding rod is slidably connected to the side wall of the device by a spring.

[0069] In this embodiment, by setting a sealing mechanism 4, the grinding roller 11 door is sealed. While sealing the grinding roller 11 door, the normal operation of the grinding roller 11 door is not affected, thereby reducing system air leakage and system power consumption.

[0070] In detail, by setting the swing ball 412 and the isolation baffle 413, the swing rod 411 rotates along the center of the swing ball 412. While the swing rod rotates, the isolation rings 414 on both sides are adjusted up and down at the same time. A ring of heat insulation cotton is set on the inner side of the isolation ring 414. By attaching the heat insulation cotton to the surface of the swing rod, the windproof effect of the edge of the swing rod is achieved, reducing air leakage.

[0071] Sealing elements 42 are provided on both sides of the swing member 41. The first sealing element 42 is folded around the swing rod and contains an elastic element, which can be a spring. The elastic effect of the spring and the folding allows the first heat insulation cotton 421 to fit tightly around the swing rod. The second heat insulation cotton 422 is then provided, which is mainly used to fill the edge of the first heat insulation cotton 421. The third heat insulation cotton 423 is provided to compensate for the position of the first and second heat insulation cotton 422. Since the second heat insulation cotton 422 is attached to the surface of the first heat insulation cotton 421, a conical gap is left. The third heat insulation cotton 423 fills the conical gap. When the swing rod swings to one side, the gap on the other side increases. The third heat insulation cotton 423 pops out under the action of the spring and fills the gap. The three sets of heat insulation cotton achieve heat insulation and windproofing of the gap without affecting the normal swing of the swing rod.

[0072] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component 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 the invention.

[0073] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0074] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-efficiency grinding device for a coal mill, characterized in that, include: A coal mill (1) includes a grinding roller (11), a fixing frame (12) for fixing the grinding roller (11), a grinding disc (13) that cooperates with the grinding roller (11) for grinding, an air ring (14) disposed outside the grinding disc (13) for blowing up coal powder, and a dust collection device (15) disposed above the coal mill (1) for collecting coal powder in the airflow. Grinding mechanism (2), which is located inside the coal mill (1) and is used to grind coal blocks, the grinding mechanism (2) includes a crushing unit (21) for crushing coal blocks and a grinding unit (22) for crushing small coal blocks after crushing. Separation mechanism (3), which is located below the crushing assembly and is used to separate coal powder and fly sand; A sealing mechanism (4) is provided on the side wall of the coal mill (1) and is used to seal the door of the grinding roller (11); The grinding unit (22) includes a steering assembly (221) disposed on the grinding roller (11) and used to drive the grinding roller (11) to turn, a crushing assembly (222) disposed on the inner side of the grinding roller (11) and used to assist the grinding roller (11) in grinding, and a dispersing assembly (223) disposed on the outer side of the grinding roller (11) and used to disperse the cake-shaped coal powder. The steering assembly (221) includes a rotating frame (2211) that fixes the rotating shaft of the grinding roller (11), a steering knuckle (2212) that is horizontally rotatably connected to the upper end of the rotating frame (2211) and vertically provided with a spring between the rotating frame (2211) and the upper end of the steering knuckle (2212) is vertically rotatably connected to the fixed frame (12) and driven by a motor to rotate vertically.

2. The high-efficiency grinding device for a coal mill according to claim 1, characterized in that, The crushing unit (21) is located below the feed inlet of the coal mill (1) and includes a crushing roller (211) for crushing large coal blocks into smaller blocks, a distribution bin (212) located below the crushing roller (211), a filter disc (215) located below the powder bin and located in the middle of the powder bin, a conveying pipe (214) located below the filter disc (215) and fixedly connected to the center of the grinding disc (13), and a sorting pipe (216) located below the filter disc (215) and connected to the separation mechanism (3).

3. The high-efficiency grinding device for a coal mill according to claim 2, characterized in that, The steering assembly (221) also includes an isolation rod (2213) disposed inside the grinding roller (11) and a movable part (2214) disposed on one side of the circumference of the grinding roller (11). The movable component (2214) includes a slide bar (2215) fixed on the fixed frame (12), a lifting frame (2216) vertically slidably connected to the slide bar (2215), and a conveyor belt (2217) disposed below the lifting frame (2216).

4. The high-efficiency grinding device for a coal mill according to claim 1, characterized in that, The crushing assembly (222) includes a pressure ring (2221) disposed inside the rotating frame (2211) and multiple pressure components (2222) evenly disposed along the edge of the grinding roller (11) along the center of the grinding roller (11). The pressure component (2222) includes a control plate (2223) rotatably connected to the grinding roller (11) and rotating through a worm gear, a push rod (2224) slidably connected to the control plate (2223), and a pressure plate (2225) disposed at the lower end of the push rod (2224).

5. The high-efficiency grinding device for a coal mill according to claim 1, characterized in that, The dispersion component (223) is provided in multiple sets and is evenly arranged on the outside of the grinding roller (11) along the center of the grinding roller (11). It includes a filter groove (2231) fixedly connected to the grinding roller (11), a sliding groove (2232) fixedly connected to the grinding roller (11), a moving block (2233) slidably connected to the sliding groove (2232), and a friction plate (2234) hinged to the outer end of the moving block (2233) and arranged inside the filter groove (2231). The friction plate (2234) is driven to rotate and the moving block (2233) is driven to move by a gear and rack transmission method.

6. The high-efficiency grinding device for a coal mill according to claim 1, characterized in that, The separation mechanism (3) includes a separation tank (31) located below the sorting tube (216), a stirring blade (32) actively connected to the middle of the separation tank (31) and driven by a motor, a flow pool (33) located at the bottom of the separation tank (31) and connected to the separation tank (31), an inclined filter screen (34) located outside the separation tank (31) and the inclined filter screen (34) is lowered and connected to the flow pool (33), a drying box (35) located outside the inclined filter screen (34), and a discharge port (36) located outside the drying box (35) with a desiccant and an air hole (37) located below the inclined filter screen (34).

7. The high-efficiency grinding device for a coal mill according to claim 1, characterized in that, The sealing mechanism (4) includes a swinging component (41) and a sealing component (42). The swinging component (41) includes a swing rod (411) disposed inside the grinding roller (11) and used to control the fixed frame (12), a swing ball (412) disposed in the middle of the swing rod (411), an isolation baffle (413) disposed around the swing ball (412) and in contact with the swing ball (412), and two sets of isolation rings (414) symmetrically disposed on both sides of the isolation baffle (413).

8. The high-efficiency grinding device for a coal mill according to claim 7, characterized in that, The sealing element (42) is respectively set on the outside of the two sets of isolation rings (414), including three sets of heat insulation cotton arranged in different forms. The first heat insulation cotton (421) includes multiple sets folded and arranged on the outside of the swing rod in a direction perpendicular to the swing rod (411). The second heat insulation cotton (422) surrounds the swing rod and is attached to the outside of each set of first heat insulation cotton (421). The third heat insulation cotton (423) includes multiple sets and is respectively arranged in the gap of the second heat insulation cotton (422). Each set of first heat insulation cotton (421) is provided with an elastic element in the middle. The third heat insulation cotton (423) is provided with a sliding rod on the outside and the sliding rod is slidably connected to the side wall of the device by a spring.

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