Efficient grinding device for coal mill

Abstract

The invention relates to the technical field of vertical coal mills, in particular to an efficient grinding device for a coal mill. The coal mill comprises a grinding roller, a fixing frame for fixing the grinding roller, a grinding disc matched with the grinding roller for grinding, an air ring arranged on the outer side of the grinding disc and used for blowing pulverized coal and a dust collecting device arranged above the coal mill and used for collecting the pulverized coal in airflow. The grinding mechanism is arranged in the coal mill and used for grinding the coal briquettes, and the grinding mechanism comprises a crushing unit used for crushing the coal briquettes and a grinding unit used for crushing the crushed small coal briquettes; the separating mechanism is arranged below the crushing assembly and is used for separating the pulverized coal from the flying sand; the sealing mechanism is arranged on the side wall of the coal mill and is used for sealing the milling roller door. The technical problem that the grinding roller is abraded quickly is solved.

Description

Technical Field

[0001] The invention relates to the technical field of vertical coal mills, and in particular to a high-efficiency grinding device for coal mills. Background Art

[0002] The vertical coal mill adopts the most advanced dynamic and static combined separator, which has high classification efficiency and large adjustment range. The powder selection fineness can reach 0.08mm and the screen residue is less than 3%, which can meet the fineness requirements of most inferior coal or anthracite powder grinding in cement production lines. The advanced grinding method saves 30%~40% of energy consumption compared with the ball mill.

[0003] The patent document with patent number CN218689958U discloses a wear-resistant vertical coal mill, which belongs to the technical field of vertical coal mills. The key points of its technical solution include a feed bin, a feed tray is fixedly installed inside the feed bin, and three evenly distributed feed holes are opened on the upper end surface of the feed tray. A rotating shaft passes through and is movably installed in the middle of the upper end surface of the feed tray, and three evenly distributed push plates are fixedly connected to the outer side wall of the rotating shaft.

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

[0005] The purpose of the present invention is to address the deficiencies of the prior art. By setting a grinding mechanism and a separation mechanism, the wear of the grinding roller is reduced from two aspects: reducing the abnormal damage to the grinding roller caused by large abrasives and removing flying sand, thereby increasing the service life of the grinding roller, thereby solving the technical problem of rapid wear of the grinding roller.

[0006] In view of the above technical problems, the technical solutions adopted are as follows: A high-efficiency grinding device for a coal mill, comprising: A coal mill, the coal mill comprising a grinding roller, a fixing frame for fixing the grinding roller, a grinding disc for grinding in cooperation with the grinding roller, an air ring arranged outside the grinding disc and used for blowing up coal powder, and a dust collecting device arranged above the coal mill and used for collecting coal powder in the air flow; A grinding mechanism, which is arranged inside the coal mill and is used to grind the coal blocks, and includes a crushing unit for crushing the coal blocks and a grinding unit for crushing the crushed small coal blocks; A separation mechanism, which is arranged below the crushing assembly and is used to separate coal powder from flying sand; A sealing mechanism is provided on the side wall of the coal mill and is used for sealing the grinding roller door.

[0007] Preferably, the crushing unit is arranged below the feed port of the coal mill, and includes a crushing roller for crushing large coal blocks into small pieces, a distribution bin arranged below the crushing roller, a filter disc arranged below the powder bin and arranged in the middle of the powder bin, a conveying pipe arranged below the filter disc and fixedly connected to the center of the grinding disc, and a classification pipe arranged below the filter disc and connected to the separation mechanism.

[0008] Preferably, the grinding unit comprises a steering assembly arranged on the grinding roller and used for driving the grinding roller to turn, a crushing assembly arranged on the inner side of the grinding roller and used for assisting the grinding roller in grinding, and a dispersing assembly arranged on the outer side of the grinding roller and used for dispersing the cake-like coal powder.

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

[0010] Preferably, the steering assembly further comprises an isolation rod arranged on the inner side of the grinding roller and a movable member arranged on one side of the circumference of the grinding roller; The movable parts include a sliding rod fixed on a fixing frame, a lifting frame vertically slidably connected to the sliding rod, and a conveyor belt arranged below the lifting frame.

[0011] Preferably, the crushing assembly includes a pressure ring arranged on the inner side of the rotating frame and multiple groups of pressure pieces evenly arranged on the edge of the grinding roller along the center of the grinding roller. The pressure pieces include a control plate rotatably connected to the grinding roller and rotating through a worm gear, a push rod slidably connected to the control plate, and a pressure plate arranged at the lower end of the push rod.

[0012] Preferably, the dispersion components are provided in multiple groups and are evenly arranged on the outside of the grinding roller along the center of the grinding roller, including a filter trough fixedly connected to the grinding roller, a slide trough fixedly connected to the grinding roller, a moving block slidably connected to the slide trough, and a friction plate hinged at the outer end of the moving block and arranged on the inner side of the filter trough, and the friction plate is driven to rotate and the moving block is driven to move by a gear rack transmission method.

[0013] Preferably, the separation mechanism includes a separation tank arranged below the classification pipe, a stirring blade actively connected to the middle of the separation tank and driven by a motor, a flow pool arranged at the bottom of the separation tank and connected to the separation tank, an inclined filter screen arranged outside the separation tank and the inclined filter screen is placed below the flow pool, a drying box arranged outside the inclined filter screen, a discharge port arranged outside the drying box and a desiccant is arranged at the discharge port, and air holes are arranged below the inclined filter screen.

[0014] Preferably, the sealing mechanism includes a swinging member and a sealing member, wherein the swinging member includes a swing arm arranged in the grinding roller door and used to control the fixed frame, a swinging ball arranged in the middle of the swing arm, an isolation baffle arranged on the periphery of the swinging ball and fitted with the swinging ball, and two sets of isolation rings symmetrically arranged on both sides of the isolation baffle.

[0015] As another preferred embodiment, the sealing members are respectively arranged on the outside of the two groups of isolation rings, including three groups of thermal insulation cotton arranged in different forms, the first thermal insulation cotton includes multiple groups folded and arranged on the outside of the swing rod in a direction perpendicular to the swing rod, the second thermal insulation cotton surrounds the swing rod and is arranged on the outside of each group of first thermal insulation cotton, the third thermal insulation cotton includes multiple groups and is respectively arranged in the gaps of the second thermal insulation cotton, wherein an elastic part is arranged in the middle of each group of first thermal insulation cotton, a sliding rod is arranged on the outside of the third thermal insulation cotton, and the sliding rod is slidably connected to the side wall of the device through a spring.

[0016] Beneficial effects of the present invention: (1) In the present invention, a crushing unit is provided to crush the abrasive in the input device once before feeding it into the grinding disc for subsequent grinding. In this way, the abrasive contacted by the grinding roller is all crushed small pieces of abrasive, which reduces excessive damage caused by grinding large pieces of abrasive by the grinding roller, and is conducive to ensuring the stable operation and service life of the device; (2) In the present invention, by providing a steering assembly, 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, thereby preventing the larger pieces of material from rolling back and forth and causing abnormal wear on the side of the grinding roller due to the inability to enter the bottom of the grinding roller; (3) In the present invention, the cake-like material is dispersed by a dispersing assembly, which is aimed at the fact that the abrasive may carry moisture and cause powder adhesion, resulting in the cake-like material being unable to be discharged from the device and unable to be dispersed again by the grinding roller, causing the cake-like material to accumulate in the device, affecting the powder output efficiency; (4) In the present invention, a sealing mechanism is provided, and a swinging member and a sealing member are provided to seal the grinding roller door. On the one hand, the swinging member ensures that the swinging rod can swing well and will not affect the normal grinding work. On the other hand, multiple groups of heat insulation cotton are provided to seal the inside and outside of the device, thereby reducing system air leakage and reducing system energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

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

[0019] Figure 2 Schematic diagram of the structure of the crushing unit.

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

[0021] Figure 4 A schematic diagram of the structure of the steering assembly.

[0022] Figure 5 Schematic diagram of the structure of the crushing component.

[0023] Figure 6 Schematic diagram of the working status of the crushing component.

[0024] Figure 7 Schematic diagram of the structure of the dispersed components.

[0025] Figure 8 Schematic diagram of the movement direction of the dispersed components.

[0026] Fig. 9 It is a structural diagram of the separation mechanism.

[0027] Fig.10 It is a structural schematic diagram of the sealing mechanism.

[0028] Fig.11 A schematic diagram of the seal structure. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0030] Embodiment 1 like Figure 1 As shown, a high-efficiency grinding device for a coal mill comprises: A coal mill 1, the coal mill 1 comprising a grinding roller 11, a fixing frame 12 for fixing the grinding roller 11, a grinding disc 13 for grinding in cooperation with the grinding roller 11, an air ring 14 arranged outside the grinding disc 13 and used for blowing up coal powder, and a dust collecting device 15 arranged above the coal mill 1 and used for collecting coal powder in the air flow; A grinding mechanism 2, which is arranged inside the coal mill 1 and is used to grind the coal blocks. The grinding mechanism 2 includes a crushing unit 21 for crushing the coal blocks and a grinding unit 22 for crushing the small coal blocks after crushing; A separation mechanism 3, which is arranged below the crushing assembly and is used to separate coal powder and flying sand; The sealing mechanism 4 is arranged on the side wall of the coal mill 1 and is used for sealing the door of the grinding roller 11.

[0031] In this embodiment, the grinding mechanism 2 and the separation mechanism 3 are provided to assist the grinding work of the grinding roller 11, and at the same time reduce the impact of flying sand on 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 component of the vertical mill. The material is ground into a finished product through the grinding device and then selected by a powder classifier. The grinding device mainly refers to the area formed by the roller sleeve of the grinding roller 11 and the lining of the grinding disc 13. Therefore, the coordination of the roller sleeve and the disc lining plays an important role in the output of the mill. In daily use, the grinding roller 11 serves as a 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 more, the gap between the grinding roller 11 and the grinding disc 13 becomes larger, resulting in powder with a larger particle size being able to pass through the grinding roller 11. At this time, if you want to grind out powder with finer fineness, you need to grind repeatedly, which further increases the wear on the grinding roller 11. The fineness of the powder after grinding is further deteriorated and the powder output efficiency will gradually decrease.

[0033] It should be noted that, with regard to the wear of the grinding roller 11, in addition to the normal wear when the abrasive is ground, there is also abnormal wear on the surface of the grinding roller 11 caused by the excessive volume of the abrasive and the flying sand. Since the grinding roller 11 is tilted 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 from the side to the bottom of the grinding roller 11, resulting in the grinding roller 11 being unable to 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, and the abrasive scratches the grinding roller 11, making it impossible for the grinding roller 11 to achieve effective grinding. At the same time, the stagnant large volume of abrasive will block the small volume of abrasive from entering the bottom of the grinding roller 11, thereby weakening the powder output efficiency.

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

[0035] Therefore, the grinding mechanism 2 and the separation mechanism 3 are provided to assist the grinding of the grinding roller 11 on the one hand, and to reduce the influence of flying sand on the grinding roller 11 on the other hand.

[0036] Further, if Figure 2As shown, the crushing unit 21 is arranged below the feed port of the coal mill 1, and includes a crushing roller 211 for crushing large coal blocks into small pieces, a distribution bin 212 arranged below the crushing roller 211, a filter disc 215 arranged below the powder bin and arranged in the middle of the powder bin, a conveying pipe 214 arranged below the filter disc 215 and fixedly connected to the center of the grinding disc 13, and a classification pipe 216 arranged below the filter disc 215 and connected to the separation mechanism 3.

[0037] In this embodiment, the crushing roller 211 and the filter plate 215 are provided to crush the bulk abrasive and separate the bulk abrasive from the flying sand.

[0038] In detail, the abrasive falls from the feed port of the coal mill 1 to the middle of the crushing roller 211, and the large pieces of abrasive are broken into small pieces by the crushing roller 211 and continue to fall, falling onto the filter plate 215 in the middle of the distribution bin 212. At this time, the filter plate 215 rotates as a whole with the grinding disc 13, and the powder, small particles of abrasive and flying sand pass through the filter plate 215 and fall into the classification pipe 216 and enter the separation mechanism 3 for separation. The larger particles of abrasive after crushing separate from the filter plate 215 under the action of centrifugal force and enter the conveying pipe 214, and fall onto the grinding disc 13 for secondary crushing.

[0039] It should be noted that since large-volume abrasives cannot be directly fed from the side of the grinding roller 11 to the bottom of the grinding roller 11, it is easy to cause excessive wear on the surface of the grinding roller 11. Therefore, it is necessary to pre-crush the large-volume abrasives to avoid the situation where large pieces of abrasives need to be repeatedly ground, which aggravates the wear of the grinding roller 11. The abrasives are ground once by the crushing roller 211. The purpose of setting the crushing roller 211 here is only to break the large pieces of abrasives into small pieces of abrasives, which will not affect the powder and small particles of abrasives carried during the output of the abrasives, avoiding abrasive accumulation. At the same time, for the crushing roller 211 used for this purpose, the wear it receives has basically no effect on the grinding work of the abrasives, and can be used for a longer time.

[0040] It is worth mentioning that the small particles of flying sand and abrasive are separately transported to the separation tube for separation by using the filter disc 215, and the large particles of abrasive fall into the grinding disc 13, which does not affect the normal output efficiency of the mill.

[0041] Further, if Figure 3 As shown, the grinding unit 22 includes a steering assembly 221 arranged on the grinding roller 11 and used to drive the grinding roller 11 to turn, a crushing assembly 222 arranged on the inner side of the grinding roller 11 and used to assist the grinding roller 11 in grinding, and a dispersing assembly 223 arranged on the outer side of the grinding roller 11 and used to disperse the cake-like coal powder.

[0042] In this embodiment, the turning assembly 221, the crushing assembly 222 and the dispersing assembly 223 are provided to assist the grinding of the grinding roller 11 from three angles.

[0043] In detail, the steering assembly 221 is used to make the grinding roller 11 rotate along with the grinding disc 13. When the abrasive with large particles moves to the grinding area, the grinding roller 11 is rotated by the steering assembly 221, so that the circumferential surface of the grinding roller 11 can face the large particles of abrasive, so that the abrasive is directly crushed by the circumferential surface of the grinding roller 11. On the one hand, by making the circumferential surface of the grinding roller 11 directly grind the abrasive, the grinding effect of the abrasive is improved, and the large particles of abrasive are quickly crushed. On the other hand, the grinding roller 11 is protected to prevent the large particles of abrasive from rolling continuously due to the inability to enter the bottom of the grinding roller 11 from the side, causing abnormal damage to the edge of the grinding roller 11.

[0044] A crushing assembly 222 is provided to perform a squeeze on the abrasive before it enters the bottom of the grinding roller 11. The squeeze can prevent sharp parts in the abrasive from directly contacting the grinding roller 11, and can also preliminarily crush the abrasive and keep a certain uniform thickness before it enters the grinding roller 11, so as to avoid excessive accumulation of abrasive in some areas, which can lead to insufficient grinding during grinding.

[0045] The purpose of setting the dispersion component 223 is that when there is a certain amount of moisture in the abrasive, the powder after grinding is easy to stick together to form cake-like materials, and the cake-like materials are blown up by the wind ring 14. The cake-like materials cannot be dispersed even after being ground again by the grinding roller 11. Therefore, the dispersion component 223 is set to disperse the possible cake-like materials and prevent the accumulation of cake-like materials.

[0046] Further, if Figure 4 As shown, the steering assembly 221 includes a rotating frame 2211 for fixing the rotating axis of the grinding roller 11, a steering knuckle 2212 which is horizontally rotatably connected to the upper end of the rotating frame 2211 and has a spring vertically arranged between the rotating frame 2211, and the upper end of the steering knuckle 2212 is vertically rotatably connected to the fixed frame 12 and the steering knuckle 2212 is driven to rotate vertically by a motor.

[0047] In this embodiment, by providing the steering knuckle 2212 and the rotating frame 2211 , the grinding roller 11 can rotate at a certain angle in two directions along the rotating axes of the steering knuckle 2212 and the rotating frame 2211 to cooperate with the work of the grinding roller 11 .

[0048] In detail, by setting a rotating frame 2211, the rotating frame 2211 is used to fix the grinding roller 11, and the rotating frame 2211 is fixed on the steering knuckle 2212. When abrasive is filled under the grinding roller 11, the grinding roller 11 will inevitably be lifted. Through the setting of 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 to prevent the abrasive from being unable to be completely filled under the grinding roller 11, causing the accumulation of abrasive. At the same time, the vibration of the grinding roller 11 caused by the thickness of the abrasive is reduced, and the vibration caused by wear is prevented. At the same time, the vibration is transmitted to the fixed frame 12, thereby reducing the sealing pressure of the subsequent sealing mechanism 4.

[0049] The steering knuckle 2212 is provided to enable the grinding roller 11 to rotate in the vertical direction, that is, to 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, so that the circumferential side surface of the grinding roller 11 directly grinds the abrasive.

[0050] Further, if Figure 4 As shown, the steering assembly 221 further includes an isolation rod 2213 disposed on the inner side of the grinding roller 11 and a movable member 2214 disposed on one side of the circumference of the grinding roller 11; The movable member 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 arranged below the lifting frame 2216 .

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

[0052] In detail, the grinding disc 13 rotates, and due to the centrifugal force, the abrasive moves to the edge of the grinding disc 13. Small particles of material can move normally from under the isolation rod 2213 to the edge of the grinding disc 13, and then enter under the grinding roller 11 for grinding, while slightly larger pieces of abrasive are intercepted by the isolation rod 2213, move outward along the isolation rod 2213, and move to under the conveyor belt 2217. After the large pieces of abrasive move to under the conveyor belt 2217, they continue to move outward under the action of the conveyor belt 2217. At the same time, the conveyor belt 2217 is lifted up 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 switch can control the motor on the steering knuckle 2212 to rotate the steering knuckle 2212, thereby rotating the grinding roller 11. 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 grinds the abrasive.

[0053] The volume of the abrasive is reclassified by the isolation rod 2213, and the small-particle abrasive and flying sand are separated by the filter disc 215 in the crushing unit 21 and enter the separation mechanism 3, where the large abrasive is crushed into small pieces and sent to the grinding disc 13. Among the crushed abrasive, there is abrasive with a slightly larger volume, which is further separated by the isolation rod 2213, and the abrasive with suitable volume is normally input from the side to the bottom of the grinding roller 11, and the abrasive with a slightly larger volume is ground by the circumferential surface of the grinding roller 11, so as to further reduce the abnormal wear of the grinding roller 11 and increase the service life of the grinding roller 11.

[0054] Further, if Figure 5 , Figure 6 As shown, the crushing assembly 222 includes a pressure ring 2221 arranged on the inner side of the rotating frame 2211 and a plurality of pressure members 2222 evenly arranged on the edge of the grinding roller 11 along the center of the grinding roller 11. The pressure members 2222 include a control plate 2223 rotatably connected to the grinding roller 11 and rotated by a worm gear, a push rod 2224 slidably connected to the control plate 2223, and a pressure plate 2225 arranged at the lower end of the push rod 2224.

[0055] In this embodiment, a pressure piece 2222 is provided and a pressure plate 2225 is used to squeeze the abrasive that is about to enter under the grinding roller 11. The pressure plate 2225 is used to maintain a uniform thickness of the abrasive layer and avoid sharp parts on the surface of some abrasives, which would cause abnormal damage to the grinding roller 11.

[0056] In detail, the pressure piece 2222 rotates with the grinding roller 11. When the pressure piece 2222 rotates to the front of being lowered, the worm gear and the gear rack cooperate to drive the control board 2223 to rotate, so that the control board 2223 retracted inside the grinding roller 11 is rotated outward. At the same time, the upper end of the push rod 2224 contacts the pressure ring 2221, and gradually extends out under the action of the pressure ring 2221, pressing the pressure plate 2225 down, and the abrasive is squeezed by the pressure plate 2225.

[0057] It should be noted that, with respect to the matching of the grinding roller 11 and the grinding disc 13, there is still room for the actual wear area width of the roller sleeve to be increased. Increasing the width of the wear area can increase the grinding area of ​​the roller sleeve and the liner, thereby achieving the effect of improving the powder efficiency. After the width of the grinding roller 11 is increased, the grinding disc 13 also needs to be built-up accordingly, and the shape of the liner of the grinding disc 13 is adjusted to match the grinding roller 11, and the depth of the groove of the grinding disc 13 is kept unchanged to ensure the thickness of the material layer and to ensure the stable operation of the equipment. After the build-up welding, the contact area between the grinding disc 13 and the grinding roller 11 is increased, and the grinding efficiency is significantly improved.

[0058] The setting of the pressing plate 2225 can widen the wear area of ​​the grinding roller 11 to a certain extent. The rotation and downward pressure of the pressing plate 2225 can achieve a certain grinding effect on the abrasive. At the same time, in view of the widening of the grinding roller 11, the pressing plate 2225 is used to press down to make the material layer more uniform and the direct filling of the abrasive more compact, which is convenient for the grinding of the grinding roller 11 and ensures the stable operation of the equipment.

[0059] Further, if Figure 7 , Figure 8 As shown, the dispersion components 223 are provided with multiple groups and are evenly arranged on the outside of the grinding roller 11 along the center of the grinding roller 11, including a filter groove 2231 fixedly connected to the grinding roller 11, a slide groove 2232 fixedly connected to the grinding roller 11, a moving block 2233 slidably connected to the slide groove 2232, and a friction plate 2234 hinged at the outer end of the moving block 2233 and arranged on the inner side of the filter groove 2231. The friction plate 2234 is driven to rotate and the moving block 2233 is driven to move by a gear rack transmission method.

[0060] In this embodiment, by providing the filter slot 2231 and the friction plate 2234 , the cake-like material is scraped to the middle of the filter slot 2231 and the friction plate 2234 for friction separation, thereby reducing the occurrence of cake-like material.

[0061] In detail, the grinding roller 11 grinds the abrasive, and due to moisture, part of the powder adheres to form a cake and moves out from the bottom of the grinding roller 11 to the outside. The dispersion component 223 is evenly arranged on the grinding roller 11. As the grinding roller 11 rotates, the filter slot 2231 moves to the edge of the grinding disc 13. At the same time, when the filter slot 2231 moves to this position, the friction plate 2234 rotates from close to the surface of the grinding roller 11 to fit the inside of the filter slot 2231. During this rotation process, the cake-like material can be scraped into the filter slot 2231 and rotate upward with the grinding roller 11. At this time, the friction plate 2234 moves left and right relative to the filter plate, and the cake-like material is located between the filter plate and the friction plate 2234. The movement of the friction plate 2234 disperses the cake-like material, and the scattered powder falls through the filter disc 215.

[0062] It should be noted that, for cake-like materials, due to their heavy weight, they cannot be blown up by the air ring 14 and cannot be output from the device. Moreover, they have been ground once by the grinding roller 11 and cannot be dispersed by grinding by the grinding roller 11 again. As a result, once cake-like materials appear, they will accumulate in the grinding disc 13, affecting the normal grinding process and slowing down the powder output efficiency. The cake-like materials are captured by the filter slot 2231, which is provided with a large number of filter holes. On the one hand, it does not affect the release of normal powder, and on the other hand, it can achieve the dispersion of the cake-like materials. When there is no cake-like material, some small particles of abrasives that have not been fully ground can also be ground back and forth by the friction plate 2234 to improve the powder output effect.

[0063] Further, if Fig. 9 As shown, the separation mechanism 3 includes a separation tank 31 arranged below the classification pipe 216, a stirring blade 32 actively connected to the middle of the separation tank 31 and driven by a motor, a flow pool 33 arranged at the bottom of the separation tank 31 and connected to the separation tank 31, an inclined filter screen 34 arranged on the outside of the separation tank 31 and the inclined filter screen 34 is placed below the connected flow pool 33, a drying box 35 arranged on the outside of the inclined filter screen 34, and a discharge port 36 arranged on the outside of the drying box 35, and a desiccant is arranged at the discharge port 36 and an air hole 37 arranged below the inclined filter screen 34.

[0064] In this embodiment, the separation tank 31 and the drying box 35 are provided to separate the flying sand from the small-grain abrasive, and the separated lower-grain abrasive is recovered into the grinding disc 13 for further grinding.

[0065] In detail, the flying sand and the abrasive fall into the separation tank 31, and the separation tank 31 is connected to the flow pool 33 at the bottom, so there is water in the separation tank 31. At the same time, the stirring blade 32 rotates, and the flying sand has a greater density than the abrasive. Through the stirring of the stirring blade 32, the flying sand with high density falls into the flow pool 33 below, and the abrasive with low density follows the rotating water flow to escape from the separation tank 31 and enter the inclined filter screen. The water passes through the inclined filter screen 34, and the abrasive is filtered 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, in order for the abrasive to be filtered by the inclined filter screen 34, an air hole 37 is provided below the inclined filter screen 34. The air hole 37 and the air ring 14 use the same air source. The air hole is used to blow air to the bottom of the inclined filter screen 34, and the abrasive on the inclined filter screen 34 is blown into the drying chamber by the gas, while preventing the abrasive from clogging the inclined filter screen 34.

[0067] Further, if Fig.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 arranged in the door of the grinding roller 11 and used to control the fixed frame 12, a swinging ball 412 arranged in the middle of the swing rod 411, an isolation baffle 413 arranged on the periphery of the swinging ball 412 and fitted with the swinging ball 412, and two groups of isolation rings 414 symmetrically arranged on both sides of the isolation baffle 413.

[0068] Further, if Fig.11As shown, the sealing members 42 are respectively arranged on the outside of the two groups of isolation rings 414, and include three groups of thermal insulation cottons arranged in different forms. The first thermal insulation cotton 421 includes multiple groups folded and arranged on the outside of the swing rod 411 in a direction perpendicular to the swing rod, the second thermal insulation cotton 422 surrounds the swing rod and is arranged on the outside of each group of first thermal insulation cotton 421, and the third thermal insulation cotton 423 includes multiple groups and is respectively arranged at the gaps of the second thermal insulation cotton 422, wherein an elastic member is arranged in the middle of each group of first thermal insulation cotton 421, and a sliding rod is arranged on the outside of the third thermal insulation cotton 423, and the sliding rod is connected to the side wall of the device through a spring sliding connection.

[0069] In this embodiment, the sealing mechanism 4 is provided to achieve sealing of the grinding roller 11 door, and the normal movement of the grinding roller 11 door is not affected while achieving sealing of the grinding roller 11 door, 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 can be rotated along the center of the swing ball 412. When the swing rod rotates, the isolation rings 414 on both sides are adjusted up and down at the same time. A circle of heat insulation cotton is set on the inner side of the isolation ring 414, and the heat insulation cotton is attached to the surface of the swing rod, so as to achieve the wind blocking effect on the edge of the swing rod and reduce air leakage.

[0071] Sealing members 42 are arranged on both sides of the swing member 41, wherein the first sealing member 42 is folded and arranged around the swing rod, wherein an elastic member is arranged therein, and the elastic member can be a spring. By utilizing the elastic effect of the spring and the folding system, the first thermal insulation cotton 421 can be tightly fitted around the swing rod, and then the second thermal insulation cotton 422 is arranged. The second thermal insulation cotton 422 is mainly used to fill the edge position of the first thermal insulation cotton 421, and the third thermal insulation cotton 423 is arranged to compensate for the positions of the first and second thermal insulation cottons 422. Since the second thermal insulation cotton 422 is attached to the surface of the first thermal insulation cotton 421, a conical gap is left, and the conical gap is filled by the third thermal insulation cotton 423. When the swing rod swings to one side, the gap on the other side increases, and the third thermal insulation cotton 423 pops out under the action of the spring to fill the gap. The three groups of thermal insulation cottons are used to achieve heat insulation and wind protection of the gap without affecting the normal swing of the swing rod.

[0072] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

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

[0074] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-efficiency grinding device for a coal mill, characterized in that: include: A coal mill (1), the coal mill (1) comprising a grinding roller (11), a fixing frame (12) for fixing the grinding roller (11), a grinding disc (13) for grinding in cooperation with the grinding roller (11), an air ring (14) arranged outside the grinding disc (13) and used for blowing up coal powder, and a dust collecting device (15) arranged above the coal mill (1) and used for collecting coal powder in an air flow; A grinding mechanism (2), the grinding mechanism (2) being arranged inside the coal mill (1) and used for grinding coal lumps, the grinding mechanism (2) comprising a crushing unit (21) for crushing the coal lumps and a grinding unit (22) for crushing the crushed small coal lumps; A separation mechanism (3), the separation mechanism (3) being arranged below the crushing assembly and used for separating coal powder and flying sand; A sealing mechanism (4) is arranged on a side wall of the coal mill (1) and is used to seal a door of a grinding roller (11).

2. A high-efficiency grinding device for a coal mill according to claim 1, characterized in that: The crushing unit (21) is arranged below the feed port of the coal mill (1), and comprises a crushing roller (211) for crushing large coal lumps into small pieces, a material separation bin (212) arranged below the crushing roller (211), a filter disc (215) arranged below the powder bin and arranged in the middle of the powder bin, a conveying pipe (214) arranged below the filter disc (215) and fixedly connected to the center of the grinding disc (13), and a classification pipe (216) arranged below the filter disc (215) and connected to the separation mechanism (3).

3. The high-efficiency grinding device for coal mill according to claim 1, characterized in that: The grinding unit (22) comprises a steering assembly (221) arranged on the grinding roller (11) and used to drive the grinding roller (11) to turn, a crushing assembly (222) arranged on the inner side of the grinding roller (11) and used to assist the grinding roller (11) in grinding, and a dispersing assembly (223) arranged on the outer side of the grinding roller (11) and used to disperse cake-shaped coal powder.

4. A high-efficiency grinding device for a coal mill according to claim 3, characterized in that: The steering assembly (221) comprises a rotating frame (2211) for fixing the rotating shaft of the grinding roller (11), a steering knuckle (2212) which is horizontally rotatably connected to the upper end of the rotating frame (2211) and has a spring vertically arranged between the rotating frame (2211), and the upper end of the steering knuckle (2212) is vertically rotatably connected to the fixed frame (12) and the steering knuckle (2212) is driven by a motor to rotate vertically.

5. A high-efficiency grinding device for a coal mill according to claim 4, characterized in that: The steering assembly (221) further comprises an isolation rod (2213) arranged on the inner side of the grinding roller (11) and a movable member (2214) arranged on one side of the circumference of the grinding roller (11); The movable part (2214) comprises a sliding rod (2215) fixed on the fixing frame (12), a lifting frame (2216) vertically slidably connected to the sliding rod (2215), and a conveyor belt (2217) arranged below the lifting frame (2216).

6. The high-efficiency grinding device for a coal mill according to claim 3, characterized in that: The crushing assembly (222) comprises a pressure ring (2221) arranged on the inner side of the rotating frame (2211) and a plurality of pressure members (2222) evenly arranged on the edge of the grinding roller (11) along the center of the grinding roller (11); the pressure members (2222) comprise a control plate (2223) rotatably connected to the grinding roller (11) and rotating via a worm gear, a push rod (2224) slidably connected to the control plate (2223), and a pressure plate (2225) arranged at the lower end of the push rod (2224).

7. The high-efficiency grinding device for a coal mill according to claim 3, characterized in that: The dispersion assembly (223) is provided in multiple groups and is evenly arranged on the outside of the grinding roller (11) along the center of the grinding roller (11), comprising a filter groove (2231) fixedly connected to the grinding roller (11), a slide groove (2232) fixedly connected to the grinding roller (11), a moving block (2233) slidably connected to the slide groove (2232), and a friction plate (2234) hinged at the outer end of the moving block (2233) and arranged on the inner side of the filter groove (2231), and the friction plate (2234) is driven to rotate and the moving block (2233) is driven to move by a gear rack transmission method.

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

9. The high-efficiency grinding device for coal mill according to claim 1, characterized in that: The sealing mechanism (4) comprises a swinging member (41) and a sealing member (42); the swinging member (41) comprises a swinging rod (411) arranged in a door of a grinding roller (11) and used to control a fixed frame (12); a swinging ball (412) arranged in the middle of the swinging rod (411); an isolation baffle (413) arranged on the periphery of the swinging ball (412) and in contact with the swinging ball (412); and two groups of isolation rings (414) symmetrically arranged on both sides of the isolation baffle (413).

10. The high-efficiency grinding device for coal mill according to claim 9, characterized in that: The sealing members (42) are respectively arranged on the outside of the two groups of isolation rings (414), and include three groups of heat-insulating cotton arranged in different forms, wherein the first heat-insulating cotton (421) includes multiple groups folded and arranged on the outside of the swing rod in a direction perpendicular to the swing rod (411), the second heat-insulating cotton (422) surrounds the swing rod and is arranged in contact with the outside of each group of the first heat-insulating cotton (421), and the third heat-insulating cotton (423) includes multiple groups and is respectively arranged at the gap of the second heat-insulating cotton (422), wherein an elastic member is arranged in the middle of each group of the first heat-insulating cotton (421), and a sliding rod is arranged on the outside of the third heat-insulating cotton (423), and the sliding rod is slidably connected to the side wall of the device through a spring.

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