A coal feeder coal drop pipe cleaning device

Abstract

This invention discloses a coal feeder chute cleaning device, belonging to the field of coal feeder cleaning technology. It includes a chute and an inclined pipe. A linear displacement module is provided at the end of the inclined pipe. A drive motor and an electric hoist are integrated on the mounting base of the displacement module. A slag-inserting rod is connected to the output end of the drive motor, and a deflectable hook head is connected to the front end of the slag-inserting rod. The electric hoist achieves flexible connection through a retractable iron chain and the engagement of the end hook with the hook head. This invention innovatively integrates an electromagnet within the main body of the slag-inserting rod, providing both DC strong magnetic and AC excitation operating modes. When powered by DC, it can attract and fix the iron chain to form a rigid auger structure for powerful cutting. When powered by AC, it drives the iron chain to generate high-frequency micro-amplitude vibration to disintegrate deep-seated arches. This invention effectively solves the problems of high insertion resistance, easy chain slippage, and difficulty in disintegrating arches in traditional unblocking devices, greatly improving the automation, intelligence, and reliability of coal feeder chute unblocking operations.

Description

Technical Field

[0001] This invention relates to the field of coal feeder cleaning technology, and more specifically, to a coal feeder chute cleaning device. Background Technology

[0002] In the coal conveying system of thermal power plants, the coal feeder is the core feeding equipment connecting the raw coal bunker and the coal mill. Its operational stability directly affects the continuity of boiler combustion and the safety of power generation load. During long-term operation, factors such as changes in coal quality, ambient humidity, and the material discharge pressure within the raw coal bunker can easily lead to severe adhesion and accumulation on the coal feeder's chute wall and outlet, potentially causing complete blockage. Furthermore, the high-temperature radiation from the boiler furnace and flue gas backflow often cause the internal temperature of the chute to rise, resulting in the release and adhesion of volatile matter from the coal, further exacerbating the hardening, caking, and arching of coal slag. Once the chute becomes blocked, it can not only cause serious accidents such as the coal feeder tripping and boiler coal supply interruption, but may also lead to unstable combustion or even fire suppression and shutdown, resulting in significant economic losses and safety hazards for the power plant. Therefore, developing efficient, safe, and reliable coal feeder cleaning devices has always been an important research direction in the field of equipment maintenance in the power industry.

[0003] Currently, there are three main traditional methods for clearing blockages in the coal feeder's chutes. One method is manual labor, using a long, rigid pry bar. An operator inserts the bar through the inspection hole or angled opening of the chute and manually pushes and pulls to clear the blockage. This method is extremely labor-intensive, operates in a harsh environment, and due to the limited space inside the chute, the manual pry bar often only targets the center of the blockage, resulting in very low efficiency and a high risk of irreversible scratches or deformation to the inner lining of the chute. Another method is using compressed air to purge, utilizing the impact force of high-pressure gas to clear the blockage. While this method is relatively simple, when dealing with severe caking or wet coal adhesion, the high-pressure air often only creates a narrow airflow channel, failing to fundamentally break down the physical structure of the caking. Furthermore, the dust generated easily pollutes the surrounding environment, increasing the risk of dust explosions. The third method involves installing an auger-type or spiral propulsion mechanical cleaning structure on the outside of the coal chute. When this structure is inserted into the blockage area, it relies on the squeezing and rotating shearing of the auger's outer diameter to forcibly push the coal slag downwards. However, the blockage at the bottom of the coal chute usually has extremely high hardness and shear strength. The large outer diameter of the auger needs to overcome a great deal of positive resistance when it is first inserted. This resistance acts directly on the wall of the coal chute, which can easily cause the already thinned coal chute due to high temperature and wear to be squeezed, deformed, torn, or even cracked, resulting in the scrapping of the equipment and increased maintenance costs.

[0004] Meanwhile, when encountering coal slag agglomerates, especially sticky muddy coal slag formed when it comes into contact with water, simple rotational scraping cannot break the sticky interlocking skeleton inside the coal slag. Even after repeated rotational friction, the sticky coal slag still forms an extremely stubborn "arch bridge" structure on the inner wall of the coal drop pipe, hanging in the air and not falling. This forces the operators to frequently and repeatedly perform mechanical actions of pushing in and pulling out, and the rigid impact of each mechanical action aggravates the fatigue damage of the equipment's transmission components. Summary of the Invention

[0005] The purpose of this invention is to provide a coal feeder duct cleaning device to solve the above-mentioned problems.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows: A coal feeder chute cleaning device includes a coal chute and an inclined pipe disposed on the side of the coal chute. It also includes a linear displacement module that provides linear displacement power. A mounting base is slidably mounted on the linear displacement module. A drive motor is fixedly mounted on the mounting base. A rotatable slag-pumping rod is fixedly connected to the output end of the drive motor. A deflectable hook head is hinged to the front end of the slag-pumping rod via a connecting shaft. A retractable electric hoist is also fixedly mounted on the mounting base. An iron chain is fixedly connected to the output end of the electric hoist. A hook matching the hook head is fixedly mounted to the front end of the iron chain.

[0007] As a further improvement of the present invention, the hook head includes a main body, a rotating part that cooperates with the connecting shaft is fixedly installed at one end of the main body near the slag-pouring rod, and a crossbar locking part for cooperating with the hook is provided at the front end of the main body.

[0008] As a further improvement of the present invention, the slag-pumping rod includes a main rod body, and a connecting end is fixedly installed on the main rod body near the drive motor. A rotating conductive slip ring is sleeved on the outer end of the connecting end.

[0009] As a further improvement of the present invention, the rotating conductive slip ring is electrically connected to an external power supply device that can provide DC and AC power. The main rod body integrates multiple electromagnets that can magnetically fix the hook. When DC power is provided, the electromagnets can generate a strong and continuous magnetic attraction force on the hook, so that when it is wrapped around the surface of the main rod body, it changes from a flexible winding state to a state similar to a "rigid auger", which greatly improves the cutting force. When the attached coal slag loosens but does not collapse, the electromagnets switch to high-frequency AC power. Under the action of the alternating magnetic field, the hook generates high-frequency micro-amplitude vibration. This vibration is directly transmitted to the inside of the coal slag, destroying the interlocking and cohesion between materials, and achieving efficient arching and disintegration. After the blockage is cleared, the damping oscillation of the alternating magnetic field simultaneously completes the shaking and smooth reset of the hook.

[0010] As a further improvement of the present invention, a plurality of evenly distributed magnetic positioning grooves are provided on the outer surface of the main rod, and the magnetic positioning grooves are spirally distributed along the winding direction of the hook on the outer surface of the main rod, for multi-point positioning of the hook during winding.

[0011] As a further improvement of the present invention, a bottom energy-absorbing pad is fixedly installed at the bottom of the magnetic positioning groove, and the outer surface of the bottom energy-absorbing pad is covered with a first protective plate.

[0012] As a further improvement of the present invention, a second side elastic bladder is fixedly installed on both sides of the magnetic positioning groove, and the outer surface of the second side elastic bladder is covered with a second protective plate.

[0013] As a further improvement of the present invention, the bottom energy-absorbing pad layer includes a first bottom elastic bladder, which is filled with multiple layers of elastic energy-absorbing microspheres with successively decreasing diameters and an energy-absorbing liquid medium. A connecting pipe connects the first bottom elastic bladder and the second side elastic bladder. The bottom energy-absorbing pad layer can effectively buffer severe impacts, thereby achieving mechanical protection for the main rod. In addition, when the first bottom elastic bladder is squeezed, the liquid medium inside can enter the second side elastic bladder through the connecting pipe to cause it to expand, thereby clamping the hook and suppressing axial jump.

[0014] As a further improvement of the present invention, a heat-conducting pad is fixedly installed between the electromagnet and the bottom energy-absorbing pad layer. The energy-absorbing liquid medium has thermal conductivity and is used to transfer the heat generated when the electromagnet is working. On the one hand, the working heat can be conducted away to ensure the stability of the magnetic field of the electromagnet. On the other hand, the working heat can be conducted to the hook and then act on the coal slurry with high humidity.

[0015] As a further improvement of the present invention, a bracket is fixedly installed on the mounting base, and the bracket is provided with guide rollers in four directions for limiting and guiding the iron chain.

[0016] Compared with the prior art, the advantages of this invention are: (1) This invention sets an electromagnet with AC / DC switching power supply capability inside the slag insertion rod of the coal feeder's coal pipe cleaning device. During the unblocking process, the flexible iron chain can be transformed into a rigid auger structure by using a DC strong magnet. This completely solves the problem of slippage and free rotation caused by physical sliding during the rotation and cutting process of the traditional flexible iron chain, greatly improving the shearing and destruction capability of hard blockages. Moreover, the whole process does not require an external complex mechanical gear reversing structure, and the control method is simple and efficient.

[0017] (2) This invention utilizes the excitation effect generated by the high-frequency AC power supply of the electromagnet to cause the iron chain adsorbed on the surface of the slag insertion rod to generate directional high-frequency micro-amplitude vibration. This vibration wave can directly penetrate and act on the internal bonding surface of the coal slag arch, and use the physical resonance effect to destroy the internal cohesion of high humidity or high strength coal slag, so that the suspended arch structure that is difficult to remove by traditional mechanical scraping can be completely disintegrated, significantly improving the thoroughness and efficiency of dealing with the blockage of complex coal chutes.

[0018] (3) The present invention embeds a bottom energy-absorbing pad with an energy-absorbing medium and a heat-conducting connection structure in the magnetic positioning groove of the slag insertion rod. On the one hand, it can provide reliable buffering and lateral mechanical clamping when the iron chain rotates at high speed and is impacted, effectively suppressing the abnormal jumping of the iron chain and protecting the rotating main shaft of the slag insertion rod. On the other hand, the bottom energy-absorbing pad can effectively transfer the heat generated by the electromagnet during operation to the contact surface between the iron chain and the coal slag, which can preheat and de-stick the high-humidity coal slime. Thus, while avoiding the electromagnet from overheating and demagnetizing, it further enhances the adaptability of the unblocking operation under different temperature and humidity conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the planar structure of the linear displacement module of the present invention; Figure 3 This is a three-dimensional structural diagram of the linear displacement module of the present invention; Figure 4 The working state of the present invention Figure 1 ; Figure 5 The working state of the present invention Figure 2 ; Figure 6 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 7 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the slag-pumping rod of the present invention; Figure 9 This is a schematic diagram of the internal structure of the magnetic positioning groove of the present invention; Figure 10 This is a schematic diagram of the bottom energy-absorbing pad layer of the present invention.

[0020] Explanation of the labels in the diagram: 1. Coal chute; 2. Inclined pipe; 100. Mounting base; 3. Linear displacement module; 4. Drive motor; 5. Electric hoist; 6. Chain; 7. Hook; 8. Slag-pumping rod; 801. Main rod body; 802. Connecting end; 803. Rotating conductive slip ring; 804. Magnetic positioning groove; 9. Hook head; 901. Main body; 902. Rotating part; 903. Crossbar locking part; 10. Connecting shaft; 11. Support; 12. Guide roller; 13. Bottom energy-absorbing pad; 1301. First bottom elastic bladder; 1302. Elastic energy-absorbing microsphere; 1303. Connecting pipe; 14. Heat-conducting pad; 15. Electromagnet; 16. Second guard plate; 17. Second side elastic bladder; 18. First guard plate. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example 1: like Figures 1-3 As shown in the figure, this embodiment provides a coal feeder chute cleaning device, including a coal chute 1 and an inclined pipe 2 installed on the side wall of the coal chute 1. The coal chute 1 serves as a coal material conveying channel and is made of wear-resistant structural steel. The inner wall can be lined with wear-resistant ceramic or wear-resistant alloy layers according to working conditions to improve wear resistance during long-term conveying. The inclined pipe 2 serves as the inlet and outlet channel for the slag-inserting rod 8 during unblocking operations. One end of the inclined pipe 2 is welded or sealed and fixed to the opening on the side wall of the coal chute 1 through a flange. The axis of the pipe body is set at an inclined angle to the axis of the coal chute 1, which facilitates the slag-inserting rod 8 to extend into the coal chute 1 at an inclined angle to act on the blocked area. A slide gate valve is connected in series on the body of the inclined tube 2. The slide gate valve adopts a pneumatic hard seal structure. Its control end is electrically connected to the external main control cabinet. During daily coal feeding operations, the slide gate valve is kept closed to maintain the airtightness and negative pressure conveying environment inside the coal drop pipe 1. During the unblocking operation, it automatically opens upon receiving the main control command to provide a connection channel for the entry and exit of the slag rod 8.

[0023] A linear displacement module 3 is fixedly installed on the upper part of the outer end of the inclined tube 2 via a flange support. The linear displacement module 3 adopts a high-strength aluminum alloy profile guide rail and a ball screw transmission structure. The surface of the guide rail is hard anodized to improve wear resistance. The ball screw is equipped with a servo drive unit and a position feedback encoder, which has high load-bearing capacity and precise linear displacement control capability, and can accurately control the insertion depth and travel speed of the slag insertion rod 8. An integrated mounting base 100 is fixedly installed on the slider of the linear displacement module 3. A drive motor 4 is fixedly installed at the front end of the mounting base 100 by bolts and positioning pins. The drive motor 4 is preferably a servo motor with variable frequency speed regulation function, which can flexibly adjust the output speed and torque according to the blockage condition. Its output shaft is fixedly connected to the connecting end 802 at the rear end of the slag insertion rod 8 via a rigid coupling. The rigid coupling is made of heat-treated steel, which can compensate for a small amount of installation coaxiality error and can stably transmit torque to drive the slag insertion rod 8 to perform precise rotational movement. Meanwhile, an electric hoist 5 is also fixedly installed at the rear end of the mounting base 100. The electric hoist 5 adopts a ring chain winch structure with a power-off self-locking function. Its braking mechanism can lock immediately in the power-off state to prevent the chain from falling. A high-strength iron chain 6 is led out from its output end. The iron chain 6 is made of lifting-grade high-strength alloy steel and has excellent tensile and impact resistance. A reliable hook 7 is fixedly connected to the extension end of the iron chain 6. The hook 7 is a lifting hook structure with a safety buckle, which can automatically lock after being hooked to avoid hook failure during the clearing process.

[0024] like Figure 8As shown, the main structure of the slag inserting rod 8 is a high-strength non-magnetic stainless steel tube, which can be made of austenitic stainless steel such as 316L or 904L. The relative magnetic permeability of this type of material is close to that of air, ensuring that the magnetic field lines generated by the internal electromagnetic field can penetrate the main rod body 801 without obstruction and act on the external iron chain 6, avoiding eddy current losses and magnetic shielding effects on the tube wall. At the same time, stainless steel has excellent corrosion resistance and wear resistance, making it suitable for harsh working conditions with humid coal dust. A rotating conductive slip ring 803 is fitted onto the rear connecting end 802 of the slag inserting rod 8. The connecting end 802 is made of solid non-magnetic stainless steel rod and is sealed and fixedly connected to the rear end of the main rod body 801 by welding, ensuring the sealing performance of the rod body. The rotary conductive slip ring 803 adopts a through-hole structure, with gold-plated internal contacts to ensure reliable conductivity. The insulating substrate is made of polytetrafluoroethylene (PTFE) for excellent insulation and temperature resistance. The slip ring is externally encapsulated with a tight labyrinth dust cover, providing overall protection suitable for high-dust environments. The stator of the slip ring is mounted on the fixed side base of the linear displacement module 3 via a fixed bracket and is electrically connected to the external power supply control cabinet. The rotor of the slip ring rotates synchronously with the slag insertion rod 8 through a locking structure. This ensures that the external AC / DC power supply and control signals are continuously and stably supplied to the slag insertion rod 8 during dynamic rotation, guaranteeing stable power supply and signal transmission for the electrical components during rotation.

[0025] like Figure 7 As shown, a hook head 9 is hinged to the front end of the slag insertion rod 8 via a connecting shaft 10. The connecting shaft 10 is a stainless steel pin structure, which is transversely inserted into the shaft hole at the front end of the main rod 801, and its two ends are axially limited by cotter pins. The hook head 9 includes a main body 901, the rear end of which extends into a rotating part 902 that is clearance-fitted with the connecting shaft 10. The rotating part 902 is a bushing structure, and its inner wall is provided with a reasonable fit clearance with the outer wall of the connecting shaft 10 to ensure that the hook head 9 can flexibly deflect around the connecting shaft 10 within the range of 0 to 90 degrees under gravity and external traction. The front end of the main body 901 is provided with a crossbar locking part 903 for cooperating with the hook 7. The crossbar locking part 903 is a load-bearing crossbar that runs through the main body. It is made of high-strength round steel and is welded and fixed to the main body 901 at both ends. It is used to bear the huge tensile load and tangential load transmitted by the iron chain 6 during the unblocking process. After the hook 7 is engaged, it is locked on the crossbar, which can realize the stable transmission of tensile force and shear force.

[0026] like Figure 6As shown, a bracket 11 is fixedly installed on the mounting base 100. The bracket 11 is located behind the slag insertion rod 8 and is formed by bending and welding steel plate. The bracket 11 is equipped with guide rollers 12 in four directions: up, down, left, and right. The wheel body of the guide roller 12 is made of high-strength nylon or oil-impregnated polyoxymethylene, which has self-lubricating properties and good wear resistance. The center of the roller has a limiting groove that matches the shape of the chain link 6. The rollers in the four directions together form a passage for the chain, which can limit and guide the chain 6 at multiple points during the winding and unwinding process, preventing the chain from jamming or deviating from the track due to uneven tension during winding and unwinding, and ensuring the smoothness of the chain winding and unwinding operation.

[0027] Example 2 like Figures 8-9 As shown, to achieve efficient locking and vibration-induced arch breaking of the chain during the blockage clearing process, this embodiment, based on Embodiment 1, includes multiple independently encapsulated electromagnets 15 arranged in parallel along the axial direction inside the main body 801 of the slag insertion rod 8. Each electromagnet 15 uses a core structure formed by stacking high-permeability silicon steel sheets, effectively reducing eddy current losses under alternating magnetic fields. The core is externally wound with high-temperature resistant enameled wire to form an excitation coil, with insulation levels suitable for long-term high-temperature conditions. The entire electromagnet is sealed with epoxy resin under vacuum, completely isolating it from coal dust erosion and dust conductivity, ensuring the operational reliability of the internal electrical structure. The power supply lines for each electromagnet 15 are neatly arranged along the wiring grooves on the inner wall of the main body 801. Their input terminals are uniformly connected to the rotor-side conductors of the rotating conductive slip ring 803, receiving power and command control from an external control cabinet. The control cabinet can adjust the type, magnitude, and frequency of the output current according to the blockage clearing requirements, thereby controlling the magnetic field state of the electromagnet 15. The outer surface of the main rod 801 is machined with magnetic positioning grooves 804 that are evenly distributed in a spiral pattern along the winding direction of the iron chain 6. The groove shape of the magnetic positioning grooves 804 is adapted to the shape of the chain links, and the groove depth is basically the same as the height of the chain links. It is used to provide physical restraint and magnetic guidance for the iron chain during winding, so that the iron chain can be accurately embedded in the groove under magnetic adsorption to achieve close winding and avoid circumferential slippage during rotation.

[0028] like Figure 10As shown, a bottom energy-absorbing pad 13 is laid at the bottom of the magnetic positioning groove 804. This bottom energy-absorbing pad 13 is mainly composed of a first bottom elastic bladder 1301, made of high-temperature and oil-resistant fluororubber material, possessing good elastic deformation capability and anti-aging properties. Its shape conforms to the bottom contour of the magnetic positioning groove 804. Inside the first bottom elastic bladder 1301, multiple layers of stacked elastic energy-absorbing microspheres 1302 with a stepped diameter are filled. These microspheres can be hollow ceramic microspheres or glass microspheres, and are filled together with a highly thermally conductive energy-absorbing liquid medium. The stepped particle size arrangement of the microspheres forms a multi-level energy-absorbing structure, effectively absorbing impact loads of different intensities. Inside the slag insert 8, a highly thermally conductive heat-conducting pad 14 is also tightly attached between the bottom energy-absorbing pad 13 and the electromagnet 15 above. The heat-conducting pad 14 is made of a metal plate with a high thermal conductivity. It is coated with a heat-conducting medium between itself, the iron core end face of the electromagnet 15, and the top surface of the bottom energy-absorbing pad layer 13 to reduce contact thermal resistance. The heat-conducting pad 14 not only acts as a heat transfer bridge, but also quickly conducts the copper and iron loss heat generated by the electromagnet 15 during operation to the energy-absorbing liquid medium. At the same time, the energy-absorbing liquid medium, through its own high thermal conductivity, conducts this part of the working heat through the tank wall to the iron chain 6 on the outer surface of the main rod 801. The residual heat is used to preheat and reduce the stickiness of the high-humidity coal slime, reduce the adhesion of coal slag on the surface of the iron chain and rod, and improve the smoothness of unblocking.

[0029] Symmetrically arranged on both sides of the magnetic positioning groove 804 are second side elastic bladders 17. The second side elastic bladders 17 and the first bottom elastic bladder 1301 are made of the same temperature- and oil-resistant elastic material and are respectively embedded in the mounting grooves on both sides of the magnetic positioning groove 804. The outer side of the second side elastic bladder 17 is covered by a second protective plate 16, and the outer side of the bottom energy-absorbing pad 13 is covered by a first protective plate 18. Both protective plates are made of wear-resistant stainless steel sheet with a smooth surface treatment to reduce the coefficient of friction, effectively improving the wear resistance and service life of the groove structure, while uniformly transmitting pressure and heat. The first bottom elastic bladder 1301 and the second side elastic bladder 17 are connected internally by a pressure-resistant connecting pipe 1303. The connecting pipe 1303 is made of oil- and pressure-resistant flexible tubing and is embedded inside the pipe wall of the main rod 801 to ensure the sealing and structural stability of the connecting pipeline. When the iron chain is deformed by the severe pressure or impact of the coal blockage and puts pressure on the bottom of the trough, the first bottom elastic bladder 1301 is compressed and deformed by the external force. The liquid medium inside it is squeezed and flows instantaneously through the connecting pipe 1303 to the second side elastic bladders 17 on both sides, causing the second side elastic bladders 17 to expand outward. This pushes the guard plate to clamp the iron chain 6 located inside the magnetic positioning groove 804 from the side, forming a lateral mechanical constraint. This suppresses the axial jump and circumferential movement of the iron chain during the excitation process, ensuring that the vibration energy can be directionally transmitted to the coal slag direction, and improving the efficiency and stability of vibration arch breaking.

[0030] Working principle: like Figure 4 , Figure 5 As shown, during the actual unblocking operation, the slide valve at the inclined tube 2 is opened to fully connect the inner cavity of the inclined tube 2 with the internal channel of the coal drop pipe 1, preparing for the insertion of the slag rod 8. Subsequently, the linear displacement module 3 receives the main control command and starts operation. Its servo drive unit drives the ball screw to rotate, driving the mounting base 100 to move at a constant speed along the guide rail towards the inside of the inclined tube 2, thereby driving the drive motor 4, electric hoist 5, and slag rod 8 integrated on the mounting base 100 to move forward as a whole. During the advancement process, or after the slag rod 8 is advanced to the predetermined working position in the coal drop pipe 1, the electric hoist 5 receives the command and starts, releasing the set length of iron chain 6. The iron chain 6 extends into the inclined tube 2 along the guide roller 12 on the support 11. The hook 7 at the end of the iron chain 6 hangs down naturally under the action of gravity and accurately hooks onto the horizontal locking part 903 of the hook head 9 at the front end of the slag rod 8. The safety buckle of the hook 7 automatically locks, completing the connection operation between the iron chain and the front end of the slag rod.

[0031] Before the slag inserting rod 8 starts rotating, the external power control cabinet supplies a large current of direct current to each electromagnet 15 inside the slag inserting rod 8 through the rotating conductive slip ring 803. Under the action of constant direct current, the electromagnets 15 generate a strong constant static magnetic field. This magnetic field penetrates the non-magnetic main rod body 801 and firmly attracts the iron chain 6 embedded in the magnetic positioning groove 804 to the outer surface of the slag inserting rod. At this time, due to the strong magnetic force and the physical limitation of the groove, the iron chain 6 loses its original flexible characteristics and transforms into an integrated rigid structure tightly combined with the main rod body 801. In this state, the drive motor 4 receives the start command and starts running. Through the coupling, it drives the main rod 801 to rotate at a constant speed. The iron chain 6 adsorbed on the surface of the rod moves synchronously, thus forming a cutting component similar to a rigid auger. This component applies strong and stable shearing and scraping forces to the blockage coal slag in the coal drop pipe 1, which can effectively break up large areas of hard blockage materials. At the same time, it effectively avoids the slippage and freewheeling phenomenon caused by centrifugal force and tangential resistance during the rotation of traditional flexible iron chains, ensuring a stable output of cutting and clearing force.

[0032] When the blockage in the coal chute 1 is initially broken and thinned by rigid cutting action, but the coal slag, due to its high moisture content or the physical interlocking of internal particles, still forms an "arch" structure in the upper and middle parts of the coal chute 1 that is difficult to collapse on its own, the equipment automatically switches to the second stage of blockage clearing control mode. At this time, the control cabinet instantly switches the power supply mode provided to the electromagnet 15 to high-frequency alternating current, and the constant static magnetic field generated by the direct current is converted into a high-frequency alternating magnetic field. Under the action of the high-frequency alternating magnetic field, the iron chain 6 attracted in the magnetic positioning groove 804 is no longer bound by a constant unidirectional magnetic force, but enters a micro-dynamic process of high-frequency reciprocating attraction and release, thereby generating violent high-frequency micro-amplitude vibration. This high-frequency vibration is directly transmitted to the adjacent coal slag arching layer through the surface of the iron chain 6. The high-frequency micro-amplitude vibration forms a physical resonance effect inside the coal slag, which greatly destroys the interlocking skeleton and cohesion between the coal slag material particles. This causes the sticky coal slurry block, which was originally in a suspended arching state, to rapidly disintegrate its internal structure. After losing its support, it completely collapses and falls into the conveying channel below under the action of gravity, thus completing the arching removal operation.

[0033] Throughout the aforementioned unblocking operation, if the chain 6 is subjected to abnormal impact from the coal seam or instantaneous impact force generated between embedded hard particles, the bottom energy-absorbing pad 13 installed inside the main rod 801 can absorb the rigid impact force through the coordinated deformation of its internal elastic energy-absorbing microspheres 1302 and energy-absorbing liquid medium, preventing the impact force from being directly transmitted to the electromagnet 15 and the rod structure, thus avoiding damage to the components. At the same time, after being squeezed by the impact force, the energy-absorbing liquid medium is injected into the second side elastic bladders 17 on both sides through the connecting pipe 1303, causing the side bladders to expand and push the guard plate to clamp the side of the chain, playing a good role in clamping and eliminating gaps, preventing the chain 6 from violently jumping and detaching from the magnetic positioning groove 804 due to excessive vibration, and ensuring the stability of the adsorption and vibration process. After the unblocking operation is completed, the control cabinet applies a damped alternating current to the electromagnet 15, gradually weakening the magnetic field strength and reducing the vibration frequency. During this gentle vibration, the chain 6 smoothly exits the magnetic positioning groove 804's adsorption constraint. Simultaneously, the residual oscillation generated by the alternating magnetic field automatically shakes off and cleans the residual coal dust on the chain 6 surface, preventing secondary pollution caused by coal dust being carried out with the chain during recovery. Subsequently, the electric hoist 5 receives a command and starts tightening the chain 6. The chain 6 gradually retracts along the guide roller 12. Simultaneously, under the pull of the chain, the hook head 9, which was originally in a hooked state and deflected downwards, is pulled upwards and smoothly returns to a straight position parallel to the slag insertion rod 8, facilitating the extraction of the inclined pipe along with the slag insertion rod. Finally, the linear displacement module 3 reverses its movement, completely extracting the mounting base and slag insertion rod 8 from the inclined pipe 2 and returning them to their initial positions. The valve at the inclined pipe 2 is closed, restoring the sealed conveying state of the coal drop pipe, completing a full automated unblocking operation.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A coal feeder chutes cleaning device, comprising a chutes (1) and an inclined pipe (2) disposed on the side of the chutes (1), characterized in that: It also includes a linear displacement module (3) that provides linear displacement power. A mounting base (100) is slidably mounted on the linear displacement module (3). A drive motor (4) is fixedly mounted on the mounting base (100). A rotatable slag-pumping rod (8) is fixedly connected to the output end of the drive motor (4). A deflectable hook head (9) is hinged to the front end of the slag-pumping rod (8) through a connecting shaft (10). A retractable electric hoist (5) is also fixedly mounted on the mounting base (100). An iron chain (6) is fixedly connected to the output end of the electric hoist (5). A hook (7) matching the hook head (9) is fixedly mounted to the front end of the iron chain (6).

2. The coal feeder chute cleaning device according to claim 1, characterized in that: The hook head (9) includes a main body (901), and a rotating part (902) that cooperates with the connecting shaft (10) is fixedly installed at one end of the main body (901) near the slag-pouring rod (8). A crossbar locking part (903) for cooperating with the hook (7) is provided at the front end of the main body (901).

3. The coal feeder chute cleaning device according to claim 1, characterized in that: The slag-pumping rod (8) includes a main rod body (801), and a connecting end (802) is fixedly installed on one end of the main rod body (801) near the drive motor (4). A rotating conductive slip ring (803) is sleeved on the outer end of the connecting end (802).

4. The coal feeder chute cleaning device according to claim 3, characterized in that: The rotating conductive slip ring (803) is electrically connected to an external power supply device that can provide DC and AC power, and the main rod body (801) integrates multiple electromagnets (15) that can magnetically fix the hook (7).

5. A coal feeder duct cleaning device according to claim 4, characterized in that: The outer surface of the main rod (801) is provided with a plurality of uniformly distributed magnetic positioning grooves (804), and the magnetic positioning grooves (804) are spirally distributed along the winding direction of the hook (7) on the outer surface of the main rod (801) for multi-point positioning when the hook (7) is wound.

6. A coal feeder chute cleaning device according to claim 5, characterized in that: The bottom of the magnetic positioning groove (804) is fixedly installed with a bottom energy-absorbing pad (13), and the outer surface of the bottom energy-absorbing pad (13) is covered with a first protective plate (18).

7. A coal feeder duct cleaning device according to claim 6, characterized in that: The magnetic positioning groove (804) has a second side elastic bladder (17) fixedly installed on both sides of the wall, and the outer surface of the second side elastic bladder (17) is covered with a second protective plate (16).

8. A coal feeder duct cleaning device according to claim 7, characterized in that: The bottom energy-absorbing pad (13) includes a first bottom elastic bladder (1301), which is filled with multiple layers of elastic energy-absorbing microspheres (1302) with successively decreasing diameters and an energy-absorbing liquid medium. A connecting tube (1303) connects the first bottom elastic bladder (1301) and the second side elastic bladder (17).

9. A coal feeder duct cleaning device according to claim 8, characterized in that: A heat-conducting pad (14) is fixedly installed between the electromagnet (15) and the bottom energy-absorbing pad (13). The energy-absorbing liquid medium has thermal conductivity and is used to transfer the heat generated by the electromagnet (15) when it is working.

10. A coal feeder duct cleaning device according to claim 1, characterized in that: A bracket (11) is fixedly installed on the mounting base (100), and the bracket (11) is provided with guide rollers (12) in four directions for limiting and guiding the iron chain (6).

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