Wall hanging and bridging prevention device for raw coal bunker of coal mill

Abstract

The invention discloses a coal mill raw coal bunker wall-hanging and bridging prevention device which comprises a raw coal bunker, a coal falling pipe, an anti-blocking mechanism and a cutting mechanism, the coal falling pipe is connected with the raw coal bunker, the anti-blocking mechanism is located in the raw coal bunker, and the anti-blocking mechanism comprises a first driving part, a rotating rod, a fixing rod, a screw rod, a connecting plate and a scraping plate. The output end of the first driving piece is connected with the first end of the rotating rod, the screw rod is connected with the rotating rod through a fixing rod, the scraper is connected with the rotating rod through a connecting plate, and the cutting mechanism comprises a cutting chamber, a second driving piece, a rotating shaft, cutting blades and a mounting frame; the output end of the second driving part is connected with the first end of the rotating shaft, the second end of the rotating shaft penetrates through the dividing chamber and enters the dividing chamber, the multiple dividing blades are arranged on the rotating shaft, and the mounting frame is arranged on the outer side of the dividing chamber and used for fixing the second driving part. The wall hanging and bridging prevention device for the raw coal bunker of the coal mill has the advantages that the raw coal bunker maintenance effect is good, and discharging is smooth.

Description

Technical Field

[0001] This invention relates to the field of raw coal bunker technology, and in particular to an anti-bridging device for raw coal bunkers in coal mills. Background Technology

[0002] The raw coal bunker is a crucial link in coal-fired systems such as thermal power plants, cement plants, and coal chemical plants. Located at the end of the coal conveying system and the beginning of the pulverizing system, its main function is to store and stably supply raw coal, ensuring continuous operation of the coal mill. Currently, traditional raw coal bunkers often use scrapers and air cannons to prevent coal from sticking to the walls and bridging. However, when encountering relatively moist coal slurry, the scrapers are prone to sticking, increasing their weight and causing the motor to operate under overload. Over time, this can easily lead to blockages at the raw coal bunker's outlet, often requiring manual unblocking, which is not only difficult to operate but also poses safety hazards. Summary of the Invention This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose an anti-bridging device for the raw coal bunker of a coal mill, which has the advantages of good maintenance of the raw coal bunker and smooth material discharge.

[0003] According to an embodiment of the present invention, a coal mill raw coal bunker anti-wall bridging device includes a raw coal bunker, a coal chute, an anti-blocking mechanism, and a dividing mechanism. The coal chute is connected to the raw coal bunker, and the anti-blocking mechanism is located inside the raw coal bunker. The anti-blocking mechanism includes a first driving member, a rotating rod, a fixed rod, a spiral rod, a connecting plate, and a scraper. The output end of the first driving member is connected to the first end of the rotating rod. The spiral rod is connected to the rotating rod through the fixed rod, and the scraper is connected to the rotating rod through the connecting plate. The dividing mechanism includes a dividing chamber, a second driving member, a rotating shaft, dividing blades, and a mounting frame. The dividing chamber is arranged on the coal chute. The output end of the second driving member is connected to the first end of the rotating shaft. The second end of the rotating shaft passes through the dividing chamber and enters the interior of the dividing chamber. A plurality of dividing blades are arranged on the rotating shaft, and the mounting frame is arranged outside the dividing chamber to fix the second driving member.

[0004] The anti-bridging device for the raw coal bunker of the coal mill according to embodiments of the present invention has the advantages of good maintenance of the raw coal bunker and smooth material discharge. This application has the following advantages: Through the design of the anti-blocking mechanism, a mechanized anti-blocking method is used, by rotating scrapers and screw rods to agitate the coal body and scrape off coal sludge adhering to the bunker wall, effectively preventing wall adhesion and bridging, ensuring smooth material discharge from the raw coal bunker, and guaranteeing the efficient and stable operation of the conveying system. Simultaneously, the setting of the dividing mechanism, through the second driving component driving the rotating shaft to drive the dividing blades, actively disperses and cuts the material in the falling coal pipe, effectively disrupting its overall fluidity and preventing accumulation and caking within the raw coal bunker. This achieves pre-homogenization of the material, significantly improving the conveying efficiency of the subsequent system.

[0005] In some embodiments, the dividing mechanism further includes a flow guide grille, which is detachably arranged in the dividing chamber, with one end of the flow guide grille connected to the inner wall of the dividing chamber and the other end of the flow guide grille inclined upwards toward the dividing blade.

[0006] In some embodiments, the anti-hanging and bridging device for the raw coal bunker of the coal mill further includes a magnetic purification mechanism, which includes a protective cover and multiple sets of permanent magnets. The protective cover is arranged inside the coal drop pipe or the partition chamber, and the multiple sets of permanent magnets are located inside the protective cover.

[0007] In some embodiments, the anti-blocking mechanism further includes reinforcing ribs, which include a first reinforcing rib and a second reinforcing rib. The first reinforcing rib is arranged on the rotating rod corresponding to the connecting plate. The first reinforcing rib connects the rotating rod and the connecting plate, and the second reinforcing rib connects the fixed rod and the rotating rod.

[0008] In some embodiments, the dividing mechanism further includes a baffle plate disposed on one side of the rotating shaft adjacent to the inner wall of the dividing chamber, the diameter of the baffle plate being larger than the maximum circumferential diameter formed by the dividing blade as it rotates with the rotating shaft.

[0009] In some embodiments, the anti-hanging bridging device for the raw coal bunker of the coal mill further includes a reinforcing ring and a support rod. The reinforcing ring is sleeved on the outer wall of the raw coal bunker, one end of the support rod is connected to the reinforcing ring, and the other end of the support rod is connected to a concrete foundation, a steel structure, or the coal mill.

[0010] In some embodiments, the pitch of the auger gradually decreases from top to bottom to increase the compressive strength of the coal at the bottom of the raw coal bunker.

[0011] In some embodiments, the scraper is pivotally connected to the connecting plate, and a torsion spring is provided on the connecting plate. The torsion spring is connected to the scraper and pushes the scraper toward the inner wall of the raw coal bunker.

[0012] In some embodiments, the anti-hanging bridging device for the raw coal bunker of the coal mill further includes a fixing frame, which is arranged on the top of the raw coal bunker to fix the first driving member.

[0013] In some embodiments, the anti-bridging device for the raw coal bunker of the coal mill further includes a warning light, which is arranged on the outer wall of the raw coal bunker. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the anti-bridging device for the raw coal bunker of the coal mill according to an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the anti-blocking mechanism of the anti-wall bridging device for the raw coal bunker of the coal mill according to an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the segmentation mechanism of the anti-hanging bridging device for the raw coal bunker of the coal mill according to an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the flange ring and sealing ring fitting together in the anti-bridging device of the raw coal bunker of the coal mill according to an embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram showing the location of the warning light of the anti-bridging device for the raw coal bunker of the coal mill according to an embodiment of the present invention.

[0019] Figure 6 This is a top view schematic diagram of the anti-bridging device for the raw coal bunker of the coal mill according to an embodiment of the present invention.

[0020] Attached diagram labels: 1. Raw coal bunker; 2. Coal chute; 3. Anti-blocking mechanism; 30. First driving component; 31. Rotating rod; 32. Fixed rod; 33. Helical rod; 34. Connecting plate; 35. Scraper; 4. Dividing mechanism; 40. Dividing chamber; 41. Second drive component; 42. Rotating shaft; 43. Dividing blade; 44. Mounting bracket; 5. Reinforcing ring; 6. Support rod; 7. Fixing bracket; 8. Warning light; 9. Flange ring; 10. Sealing ring; 11. Alarm. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] According to an embodiment of the present invention, the anti-bridging device for the raw coal bunker 1 of the coal mill includes a raw coal bunker 1, a coal chuting pipe 2, an anti-blocking mechanism 3, and a dividing mechanism 4. The coal chuting pipe 2 is connected to the raw coal bunker 1. The anti-blocking mechanism 3 is located inside the raw coal bunker 1. The anti-blocking mechanism 3 includes a first driving member 30, a rotating rod 31, a fixed rod 32, a spiral rod 33, a connecting plate 34, and a scraper 35. The output end of the first driving member 30 is connected to the first end of the rotating rod 31. The spiral rod 33 is connected to the rotating rod 31 through the fixed rod 32. The scraper 35 is connected to the rotating rod 31 through the connecting plate 34. The dividing mechanism 4 includes a dividing chamber, a second driving member 41, a rotating shaft 42, dividing blades 43, and a mounting frame 44. The dividing chamber is arranged on the coal chuting pipe 2. The output end of the second driving member 41 is connected to the first end of the rotating shaft 42. The second end of the rotating shaft 42 passes through the dividing chamber and enters the interior of the dividing chamber. Multiple dividing blades 43 are arranged on the rotating shaft 42. The mounting frame 44 is arranged on the outside of the dividing chamber to fix the second driving member 41. The anti-blocking mechanism 3 and the dividing mechanism 4 work together to achieve the effects of wall cleaning and coal material handling. The rotating scraper 35 and the screw rod 33 agitate the coal body and scrape away coal sludge adhering to the walls of the raw coal bunker 1, effectively preventing wall adhesion and bridging, ensuring smooth discharge from the raw coal bunker 1, and guaranteeing the efficient and stable operation of the conveying system. The dividing mechanism 4, through the second driving component 41 driving the rotating shaft 42 to drive the dividing blades 43, actively disperses and cuts the material in the falling coal pipe 2, effectively disrupting its overall fluidity and preventing accumulation and caking within the raw coal bunker 1. This achieves pre-homogenization of the material, significantly improving the conveying efficiency of the subsequent system. The dividing mechanism 4 crushes and disperses the coal material in the falling coal pipe 2, reducing the entry of large pieces of coal and lumps into the coal mill and reducing the risk of blockage. The first driving component 30 can be a geared motor, and the rotating rod 31 serves as the core transmission carrier, driving the screw rod 33 and the scraper 35 to agitate and scrape the walls within the raw coal bunker 1, ensuring that the two actions are performed synchronously. When the auger 33 rotates, it also generates axial pushing force and radial shearing force on the lower part of the coal in the raw coal bunker 1, crushing the bottom coal and preventing the formation of dead zones. The fixing rod 32 is used to improve the connection strength between the auger 33 and the rotating rod 31, preventing the auger 33 from breaking due to excessive coal resistance. The scraper 35 directly scrapes off the coal sludge adhering to the bunker wall, preventing the coal sludge from accumulating and hardening over a long period of time. The second driving component 41 provides independent power to the dividing mechanism 4, and the crushing intensity of the dividing mechanism 4 can be controlled independently.

[0023] In some embodiments, the dividing mechanism 4 further includes a flow guide grille, which is detachably arranged in the dividing chamber. One end of the flow guide grille is connected to the inner wall of the dividing chamber, and the other end of the flow guide grille is inclined and points above the dividing blade 43.

[0024] Specifically, the guide grid can be made of stainless steel, with the mesh size tailored to the coal block segmentation requirements. The guide grid is used for preliminary screening of the coal in the coal chute 2. The guide grid's tilt angle is designed to be 30°-45°, and the end of the guide grid is spaced a certain distance from the dividing blade 43 to prevent collisions during blade rotation. It also guides the coal into the cutting area formed by the dividing blade 43. The guide grid can be fixed to the dividing chamber 40 using clips, bolts, etc., facilitating removal for cleaning and maintenance.

[0025] The flow guide grid guides the coal to fall, preventing it from flowing off course and ensuring that the dividing blade 43 is impacted evenly. This prevents excessive load on one side of the blade. The flow guide grid also acts as a decelerator, preventing the coal from directly impacting the blade and causing plastic deformation. The mesh of the flow guide grid can intercept foreign objects such as gangue in the coal, preventing them from getting stuck on the dividing blade 43 or falling with the coal.

[0026] In some embodiments, the anti-hanging and bridging device of the raw coal bunker 1 of the coal mill further includes a magnetic purification mechanism. The magnetic purification mechanism includes a protective cover and multiple sets of permanent magnets. The protective cover is arranged inside the coal drop pipe 2 or in the partition chamber, and the multiple sets of permanent magnets are located inside the protective cover.

[0027] Specifically, when the protective cover is installed inside the coal chute 2, a closed space is formed between the protective cover and the wall of the coal chute 2. Within this closed space, multiple sets of permanent magnets are evenly distributed to form a magnetic adsorption field. Metal foreign objects in the coal passing through the coal chute 2 will be magnetically adsorbed onto the protective cover, preventing them from entering the dividing chamber and protecting the coal mill, thus ensuring safe operation and reducing equipment maintenance frequency and downtime. When the protective cover is installed inside the dividing chamber, a closed space is formed between the protective cover and the inner wall of the dividing chamber. Within this closed space, multiple sets of permanent magnets are evenly distributed to form a magnetic adsorption field, adsorbing metal foreign objects and protecting the dividing blade 43. The permanent magnets have long-lasting adsorption capacity, requiring no additional power supply. The protective cover prevents coal from directly impacting the magnets, extending component lifespan. Furthermore, cleaning foreign objects is simple and convenient, without increasing daily maintenance burden. When the amount of metal foreign objects accumulated on the protective cover increases, manual cleaning is required. After stopping the equipment, the protective cover is disassembled, cleaned, and then reinstalled to restore operation.

[0028] In some embodiments, the anti-blocking mechanism 3 further includes reinforcing ribs, including a first reinforcing rib and a second reinforcing rib. The first reinforcing rib is arranged on the rotating rod 31 corresponding to the connecting plate 34. The first reinforcing rib connects the rotating rod 31 and the connecting plate 34, and the second reinforcing rib connects the fixing rod 32 and the rotating rod 31.

[0029] Specifically, the radial resistance generated when the scraper 35 scrapes the wall, especially when scraping stubborn coal slime, will cause the connecting plate 34 to tend to bend and deform. The first reinforcing rib disperses this resistance to the main body of the rotating rod 31 through the triangular support structure, so as to prevent the connecting plate 34 from cracking or bending due to local stress concentration. At the same time, the reinforcing rib can improve the installation accuracy of the scraper 35, ensuring that the scraper 35 is always in close contact with the bin wall, and preventing the scraping gap from increasing due to the deformation of the connecting plate 34, which would affect the wall cleaning effect.

[0030] When the auger 33 rotates, it must not only withstand the axial pushing reaction force of the coal, but also cope with the impact load of large pieces of coal or clumps of coal. These forces can easily cause cracking at the weld between the fixed rod 32 and the rotating rod 31, or bending of the fixed rod 32 itself. The second reinforcing rib increases the stress-bearing area of ​​the connection point, dispersing the impact load and axial force to a larger area of ​​the rotating rod 31, reducing the stress per unit area; at the same time, it can limit the radial swing of the fixed rod 32, ensuring that the auger 33 always maintains a stable rotation trajectory, and preventing the auger 33 from scraping the bin wall or losing its crushing and pushing effect due to the loosening of the fixed rod 32.

[0031] In some embodiments, the dividing mechanism 4 further includes a baffle plate arranged on one side of the rotating shaft 42 adjacent to the inner wall of the dividing chamber, and the diameter of the baffle plate is larger than the maximum circumferential diameter formed by the dividing blade 43 as it rotates with the rotating shaft 42.

[0032] Specifically, when the rotating shaft 42 drives the dividing blade 43 to rotate at high speed to cut coal, coal, especially fine coal powder or crushed coal particles, is prone to leak from the gap between the rotating shaft 42 and the inner wall of the dividing chamber, resulting in dust accumulation that contaminates the equipment and increases the cleaning burden.

[0033] In some embodiments, the anti-bridging device for the raw coal bunker 1 of the coal mill further includes a reinforcing ring 5 and a support rod 6. The reinforcing ring 5 is sleeved on the outer wall of the raw coal bunker 1, one end of the support rod 6 is connected to the reinforcing ring 5, and the other end of the support rod 6 is connected to the concrete foundation, steel structure, or coal mill. The baffle is a circular metal disc, coaxially fixed on the rotating shaft 42, and arranged close to the inner wall of the dividing chamber. The diameter of the baffle must be strictly larger than the maximum circumference diameter formed when the dividing blade 43 rotates, ensuring that the baffle can completely cover the rotation range of the dividing blade 43, preventing coal from leaking from the gap between the outer side of the blade and the inner wall, and preventing the blade from touching the inner wall due to deviation.

[0034] In some embodiments, the pitch of the screw rod 33 gradually decreases from top to bottom to increase the compressive strength of the coal at the bottom of the raw coal bunker 1.

[0035] Specifically, the upper coal material in the raw coal bunker 1 is only affected by its own gravity and has good fluidity, requiring no strong compression. The middle and lower coal material, however, is prone to caking and agglomeration due to the stacking pressure from the upper coal material. The closer to the bottom of the raw coal bunker (i.e., the inlet of the coal drop pipe 2), the greater the pressure and the more severe the caking. Simultaneously, the space at the bottom of the raw coal bunker gradually narrows, requiring stronger crushing and pushing forces. The pitch refers to the axial distance between two adjacent turns of the helical blades. A smaller pitch means an increase in the number of helical blade turns per unit axial length, increasing the frequency of "shearing-pushing" of the coal per turn of the helical rod 33. At the same time, a smaller pitch reduces the space for the coal between the blades, creating a passive compression effect. The larger pitch of the upper helical rod 33 effectively guides loose coal, while the smaller pitch at the bottom helps push the coal.

[0036] In some embodiments, the scraper 35 is pivotally connected to the connecting plate 34, and a torsion spring is provided on the connecting plate 34. The torsion spring is connected to the scraper 35 and pushes the scraper 35 toward the inner wall of the raw coal bunker 1.

[0037] Specifically, due to manufacturing errors, long-term wear, or coal sludge accumulation, the inner wall of the raw coal bunker 1 has an irregular surface. When the scraper 35 and the connecting plate 34 are rigidly connected, problems such as non-adherence or excessive compression can easily occur, causing wear of the scraper 35 and damage to the bunker wall. The scraper 35 and the connecting plate 34 are rotatably connected by a pin. The axis of the pin is parallel to the axis of the rotating rod 31. The scraper 35 rotates around the pin within a certain range, forming a flexible connection. The rigid connection between the connecting plate 34 and the rotating rod 31 ensures that the rotational power is stably transmitted to the scraper 35. A torsion spring is fitted on the pin, with one end fixed to the limiting protrusion of the connecting plate 34 and the other end connected to the scraper 35. Under natural conditions, the torsion spring is in a slightly compressed state, generating a continuous torque to push the scraper 35 towards the inner wall of the raw coal bunker 1, so that the cutting edge of the scraper 35 is always in close contact with the bunker wall. Therefore, multiple torsion springs can be used, and their positions can be arranged on both sides of the scraper 35 to achieve uniform force on both sides of the scraper 35. This allows the scraper 35 to tilt under force on any side, and the corresponding torsion spring on the other side to push the scraper 35 back to its original position. When the scraper 35 encounters a protrusion on the bin wall or a hard coal slurry block, the scraper 35 rotates around the pin axis away from the bin wall, compressing the torsion spring to store elastic potential energy and preventing excessive force on the scraper 35's cutting edge from being damaged. After passing the protrusion, the torsion spring releases its potential energy, pushing the scraper 35 back to its original position and re-fitting the bin wall, achieving a dynamic adaptation of "obstacle encounter and retreat - automatic reset" to ensure no blind spots in the scraping action.

[0038] In some embodiments, the anti-hanging bridging device for the raw coal bunker 1 of the coal mill further includes a fixing frame 7, which is arranged on the top of the raw coal bunker 1 to fix the first driving member 30.

[0039] Specifically, the first driving component 30 (such as a geared motor), as the power source of the anti-blocking mechanism 3, needs to drive components such as the rotating rod 31, the screw rod 33, and the scraper 35 to perform low-speed, high-torque rotation within the raw coal bunker 1. During operation, continuous vibration loads and torque reaction forces are generated. The fixing frame 7 is arranged on the top of the raw coal bunker 1 to rigidly fix the driving component, counteract the reaction force, ensure transmission accuracy, and provide basic support for the stable operation of the anti-blocking mechanism 3. The frame structure of the fixing frame 7 can disperse the force and protect the first driving component 30.

[0040] Optionally, a vibration sensor can be installed on the mounting bracket 7 to detect the vibration amplitude. When the vibration amplitude exceeds a set threshold, it can be determined that the first drive component 30 is faulty or the fixing bolts of the mounting bracket 7 are loose, which helps to identify dangers in a timely manner.

[0041] In some embodiments, the anti-hanging bridging device for the raw coal bunker 1 of the coal mill also includes a warning light 8, which is arranged on the outer wall of the raw coal bunker 1.

[0042] Specifically, the warning light 8 can emit light signals to provide warning information and intuitive feedback on the device's operating status, enabling real-time fault warnings and risk visualization, and providing maintenance personnel with a basis for rapid response.

[0043] In some embodiments, such as Figure 4 As shown, a flange ring 9 is installed at the connection between the dividing chamber and the rotating shaft 42.

[0044] Understandably, flange ring 9 enhances the sealing of the connection between the partition chamber and the rotating shaft 42 to prevent coal slurry leakage, which could cause losses and contamination. Flange ring 9 is placed on the outside of the coal chute 2 to enhance the sealing of the connection between the coal chute 2 and the coal mill, preventing leakage.

[0045] A sealing ring 10 is installed at the connection between the dividing chamber and the coal chutes 2. The installation of the sealing ring 10 enhances the sealing performance of the connection between the dividing chamber and the coal chutes 2, preventing coal slurry leakage that could cause losses and pollution. An alarm is installed on the outer wall of the raw coal bunker 1; the alarm can sound to alert personnel for inspection and maintenance.

[0046] Working principle: When coal slurry is transported into the raw coal bunker 1, the anti-blocking mechanism 3 effectively prevents it from sticking to the walls and bridging, ensuring smooth discharge from the raw coal bunker 1 and guaranteeing the efficient and stable operation of the conveying system. First, the first drive component 30 is activated, driving the spiral rod 33 connected to the fixed rod 32 through the rotating rod 31 to agitate the coal slurry. At the same time, the rotating rod 31 also drives the scraper 35 connected to the connecting plate 34 to scrape the bunker wall, effectively preventing it from sticking to the walls and bridging, ensuring smooth discharge from the raw coal bunker 1. When the raw coal bunker 1... When the coal slurry is transported into the coal drop pipe 2, the coal is divided by the dividing mechanism 4 to speed up the conveying rate and effectively prevent the coal slurry from accumulating in the raw coal bunker 1 for a long time, which would lead to caking. First, the second drive component 41 is started, and the dividing blade 43 is driven to move through the rotating shaft 42 to divide the coal slurry in the dividing chamber. The volume of the divided coal slurry is reduced, making it easier to be transported to the coal mill in the coal drop pipe 2. At the same time, the mounting frame 44 is used to fix the second drive component 41 to enhance the stability during operation.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A wall-hanging bridge-preventing device for a raw coal bin of a coal mill, characterized in that, The utility model relates to a coal bunker, which comprises: a raw coal bunker, a coal falling pipe, a blockage prevention mechanism and a dividing mechanism, the coal falling pipe is connected with the raw coal bunker, the blockage prevention mechanism is located in the raw coal bunker, the blockage prevention mechanism comprises a first driving element, a rotating rod, a fixed rod, a spiral rod, a connecting plate and a scraper, the output end of the first driving element is connected with the first end of the rotating rod, the spiral rod is connected with the rotating rod through the fixed rod, the scraper is connected with the rotating rod through the connecting plate, the dividing mechanism comprises a dividing chamber, a second driving element, a rotating shaft, dividing blades and a mounting bracket, the dividing chamber is arranged on the coal falling pipe, the output end of the second driving element is connected with the first end of the rotating shaft, the second end of the rotating shaft penetrates through the dividing chamber and enters the inside of the dividing chamber, a plurality of dividing blades are arranged on the rotating shaft, and the mounting bracket is arranged on the outside of the dividing chamber to fix the second driving element.

2. The wall-hanging bridge preventing device for raw coal bunker of coal mill according to claim 1, characterized in that, The utility model further comprises a flow guide grid, which is detachably arranged in the dividing chamber, one end of the flow guide grid is connected with the inner wall of the dividing chamber, and the other end of the flow guide grid is inclined to above the dividing blades.

3. The wall-hanging bridge preventing device for raw coal bunker of coal mill according to claim 1, characterized in that, The utility model further comprises a magnetic purification mechanism, which comprises a protective cover and a plurality of permanent magnets, the protective cover is arranged in the coal falling pipe or the dividing chamber, and the plurality of permanent magnets are located in the protective cover.

4. The wall-hanging bridge preventing device for raw coal bunker of coal mill according to claim 1, characterized in that, The utility model further comprises reinforcing ribs, which comprise first reinforcing ribs and second reinforcing ribs, the first reinforcing ribs are arranged on the rotating rod corresponding to the connecting plate, and the first reinforcing ribs connect the rotating rod and the connecting plate, the second reinforcing ribs connect the fixed rod and the rotating rod.

5. The wall-hanging bridge preventing device for raw coal bunker of coal mill according to claim 1, characterized in that, The utility model further comprises a baffle, which is arranged on one side of the rotating shaft adjacent to the inner wall of the dividing chamber, and the diameter of the baffle is greater than the maximum circumferential diameter formed by the rotating of the dividing blades with the rotating shaft.

6. The wall-hanging bridge preventing device for raw coal bunker of coal mill according to claim 1, characterized in that, The utility model further comprises a reinforcing ring and a support rod, the reinforcing ring is sleeved on the outer wall of the raw coal bunker, one end of the support rod is connected with the reinforcing ring, and the other end of the support rod is connected with a concrete foundation or a steel structure or a coal mill.

7. The mill raw coal bin wall sticking bridge prevention device according to claim 1, characterized in that, The pitch of the spiral rod gradually decreases from top to bottom to increase the extrusion strength of the coal at the bottom of the raw coal bunker.

8. The wall-hanging bridge preventing device for raw coal bunker of coal mill according to claim 1, characterized in that, The scraper and the connecting plate are pivotally connected, torsional springs are arranged on the connecting plate, the torsional springs are connected with the scraper and push the scraper to close to the inner wall of the raw coal bunker.

9. The wall-hanging bridge preventing device for raw coal bunker of coal mill according to claim 1, characterized in that, The utility model further comprises a fixing bracket, which is arranged at the top of the raw coal bunker to fix the first driving element.

10. The wall-hanging bridge preventing device for raw coal bunker of coal mill according to claim 1, characterized in that, The utility model further comprises a warning light, which is arranged on the outer wall of the raw coal bunker.

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