Anti-blocking coal blanking pipe device for coal storage European silo

Abstract

The invention relates to an anti-blocking coal blanking pipe device for a coal storage European bunker, which comprises a central telescopic blanking pipe, an anti-blocking coal blanking pipe and a blanking pipe mounting seat which are connected in sequence, the middle part of a first section of circular pipe of the central telescopic blanking pipe is of a big-end-down taper pipe structure, the first section of circular pipe is connected with the upper end of the anti-blocking coal blanking pipe, and the lower end of the first section of circular pipe is connected with the blanking pipe mounting seat; a dust return plate is arranged in the anti-blocking coal blanking pipe and is used for guiding dusty gas which is generated at a coal falling point below and moves along the pipe wall to the lower part, so that the dusty gas is prevented from moving into a gap between the circular pipe walls of the central telescopic blanking pipe along the cylinder wall, and an exhaust port is formed in the anti-blocking coal blanking pipe; the anti-blocking coal blanking pipe is used for discharging internal dust-containing gas out of the anti-blocking coal blanking pipe. Compared with the prior art, the phenomena of jamming and coal blockage of the center telescopic blanking pipe can be effectively reduced, the damage to the European silo equipment is avoided, the adaptability of the European silo to viscous coal is improved, and the coal storage operation stability of the European silo is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power plant equipment, in particular to an anti-blocking coal dropping pipe device for a coal storage bin. Background Art

[0002] Euro warehouse coal storage is the latest environmentally friendly way of coal storage. At present, domestic thermal power generation companies have introduced Euro warehouse technology for storing coal, but some problems have also arisen when using Euro warehouse coal storage. These problems directly affect the safe and stable operation of Euro warehouses.

[0003] There are many equipments arranged inside the Euro warehouse, which are mainly used to stack and store the coal entering the Euro warehouse from low to high, take out the coal in the warehouse from high to low, and output the coal in the warehouse.

[0004] like Figure 1 As shown, the existing coal storage Euro warehouse is mainly composed of Euro warehouse cylinder wall 1, Euro warehouse feed port 2, Euro warehouse roof trestle 3, revolving trestle 4, revolving trestle walking device 5, central telescopic dropping pipe 6, spiral frame lifting wire rope 7, spiral frame 8, screw machine 9, guide trough 10, spiral frame A-frame 11, central hoisting platform 12, central revolving platform 13, spiral frame central platform 14 and other components. The upper end of the central telescopic dropping pipe 6 is connected with the Euro warehouse feed port 2, and the lower end is connected with the guide trough 10 on the spiral frame central platform 14. The central telescopic dropping pipe 6 is the feeding channel of the Euro warehouse. The central telescopic dropping pipe 6 extends and shortens as the spiral frame central platform 14 rises and falls. Coal enters the guide trough 10 through the central telescopic dropping pipe 6 and is input into the Euro warehouse from the coal dropping output port 16 for accumulation.

[0005] like Figure 2 As shown, the central telescopic blanking tube 6 is composed of several sections of round tubes with different diameters. Taking five sections of round tubes as an example, the central telescopic blanking tube 6 is composed of a first section of round tube 6-1, a first section of round tube anchor flange 6-1-1, a guide rod hole 6-1-2, a buffer fixing bolt hole 6-1-3, a reinforcing rib 6-1-4, a limit ring 6-1-5, a second section of round tube 6-2, a third section of round tube 6-3, a fourth section of round tube 6-4, a fifth section of round tube 6-5, etc.

[0006] like Figure 3 to Figure 5As shown, the central telescopic drop tube 6 is connected to the guide trough 10, and the structure of the connection mainly consists of the first section circular tube anchor flange 6-1-1, the guide trough 10, the spiral frame central platform 14, the coal outlet 16, the grid plate 16-1, the drop tube mounting seat 17, the mounting interface 17-1, the fixed support frame 17-2, the rubber buffer 18, the guide rod 19, the buffer fixing bolt hole 17-1, etc. The first section circular tube anchor flange 6-1-1 of the first section circular tube 6-1 on the central telescopic drop tube 6 is connected to the mounting interface 17-1 on the drop tube mounting seat 17 through the rubber buffer 18, and the rubber buffer 18 plays a buffering role. The guide rod 19 is used to ensure that there is an appropriate amount of movement between the first section circular tube 6-1 of the central telescopic drop tube 6 and the drop tube mounting seat 17 to reduce the impact force, and can also ensure that it only moves axially along the guide rod 19 without causing deflection.

[0007] The discharge port at the lower end of the central telescopic drop pipe 6 is directly opposite to the coal drop outlet 16, the grid plate 16-1 and the drop area plane (coal accumulation area) 14-1 on the central platform 14 of the spiral frame. This plane is also the area where coal is accumulated when the Euro warehouse is fed, and the accumulated coal cannot be discharged by itself. The accumulated coal will accumulate more and more and even touch the lower end of the central telescopic drop pipe, so that the coal will affect the normal telescopic movement of the telescopic drop pipe.

[0008] It can be seen that the equipment arranged in the Euro warehouse mainly consists of a revolving trestle, a hoisting lifting device, a trestle walking mechanism, a central revolving platform, a central telescopic drop pipe, a spiral frame and a spiral stacking device. There is a coal transport trestle on the top of the Euro warehouse, and a belt conveyor is installed in the trestle. The coal is transported by the conveyor to the entrance of the central telescopic drop pipe on the upper part of the Euro warehouse, and then enters the Euro warehouse through the upper port of the central telescopic drop pipe installed on the central revolving platform. The coal reaches the spiral frame at the lower end outlet through the central telescopic drop pipe. The spiral frame is equipped with a device for stacking and taking coal in the warehouse, that is, a spiral machine. The spiral machine can rotate forward and reverse to achieve the accumulation and removal of coal in the warehouse.

[0009] The screw machine rotates forward to push the coal gushing out from the bottom of the central telescopic drop pipe in the circumferential direction along the radius of the cylindrical body of the Euro bin, until the coal is pushed to the bin wall. The screw frame and the revolving trestle synchronously rotate horizontally around the central axis of the Euro bin, so that the screw machine can evenly pile up the coal in the bin; when the coal in the Euro bin is output and taken out, the screw machine rotates in the opposite direction relative to the stacking, and the coal on the upper surface of the coal pile is gathered to the center of the circle, and the coal is output through the activated feeder.

[0010] The spiral frame always maintains a fixed distance (30cm to 50cm) from the upper surface of the coal in the bin when the coal is stacked in the bin. When taking materials, the spiral machine must contact the upper surface of the coal pile in the bin.

[0011] When the coal outside the warehouse enters the Euro warehouse, the coal will pass through the central telescopic dropping pipe. The upper end of the central telescopic dropping pipe is connected with the coal dropping pipe outlet on the central platform, and the lower end of the central telescopic dropping pipe is connected with the receiving point on the spiral frame. Therefore, the coal entering the warehouse must pass through the central telescopic dropping pipe. When stacking coal, the length of the central telescopic dropping pipe is continuously shortened with the lifting of the spiral frame. When taking coal out of the warehouse, the length of the central telescopic dropping pipe is continuously extended with the descending of the spiral frame. The function of the central telescopic dropping pipe is to prevent the coal entering the warehouse from being scattered during the fall. The falling coal always falls on the receiving point on the spiral frame to prevent the coal from directly impacting the coal pile; at the same time, it reduces coal dust and ensures the safety of coal entering the warehouse.

[0012] The central telescopic drop tube is formed by concentrically nesting and connecting several sections of circular tubes of different diameters. Each section of the circular tube has the same length. From the top to the bottom, from the first section of the circular tube to the last section of the circular tube, the diameter of each section of the circular tube becomes larger successively, so that the previous section of the circular tube can be inserted into the adjacent next section of the circular tube. In this way, all the circular tubes can be inserted into the last section of the circular tube in sequence, which is the so-called conveying state. Steps of different diameters are provided at both ends of each section of the circular tube as sliding limit connectors, which can make the adjacent sections slide against each other, but can be connected and hooked together and cannot be separated, and can also slide relatively along the central axis of the circular tube body. Such a structure connects several sections of the drop tube on a central axis, and expands or contracts section by section as the distance between the two ends is extended or shortened. Such structural characteristics enable the distance between the feed port and the discharge port of the central telescopic drop tube to change with the distance between the revolving trestle and the spiral frame, thereby ensuring that the material always passes through the telescopic drop tube. When the spiral frame is in the sitting height position, the central telescopic drop tube shrinks to the shortest distance. Since the central drop tube is in a vertical state, each section of the round tube is superimposed on the next section of the round tube under the action of gravity. When the spiral frame descends, starting from the first section of the round tube at the top, it is stretched out section by section until the second to last section of the round tube is completely pulled out. At this time, the spiral frame is at the bottom of the Euro warehouse, and all the coal in the warehouse has been emptied. When coal is stacked in the warehouse, the spiral frame gradually rises, and the fully stretched central telescopic drop tube begins to shrink. The shrinkage is from The second-to-last section of the bottom round tube is inserted into the first-to-last section of the round tube. When it is fully inserted, the second-to-last section of the round tube is in a stationary state relative to the first-to-last section of the round tube. As the spiral frame continues to rise, the third-to-last section of the round tube begins to be inserted into the second-to-last section of the round tube. In this way, as the spiral frame rises, the central telescopic blanking tube shrinks into the lower section of the round tube. When the spiral frame rises to the highest point, the central telescopic blanking tube is completely contracted into the lowest section of the round tube. The extension and contraction of the central telescopic blanking tube are always consistent with the rising and falling movements of the spiral frame.

[0013] However, in actual application, the coal used for power generation in China is mainly lignite, which has a high proportion of powdered coal particles, high volatile matter, high moisture content, and high viscosity. This kind of coal is relatively cheap, which can effectively reduce the cost of power generation and improve economic benefits. Therefore, the use of this kind of coal is also a trend in the power generation industry. When such coal is stored in Euro warehouses, when the coal enters the Euro warehouse from the central drop pipe, the falling coal will produce a large impact at the bottom landing point. Under the action of the impact force, small particles of coal are sprayed all around, and the surrounding air is compressed to form a large airflow. These gases The airflow carries small particles of coal and diffuses to various areas with relatively low air pressure. After the diffused airflow diffuses to the wall of the central telescopic drop tube, it climbs above the wall, which causes the airflow to enter the space between the walls of several overlapping drop tubes. Since there is a lot of water vapor in the coal, such coal particles are very easy to adhere to the wall of the tube after mixing with the water vapor. As more and more coal adheres to the wall of the tube, it will inevitably hinder the relative sliding movement of each drop tube when it is extended and retracted, and even get stuck, that is, it cannot slide at all. In severe cases, the bonded coal makes multiple drop tubes bonded into a whole. When the telescopic movement of the central telescopic drop tube cannot be synchronized with the upward and downward changes of the spiral frame, the central telescopic drop tube will be damaged. The damage and repair work of the central telescopic drop tube is relatively difficult and time-consuming, which will seriously affect the normal coal inlet and outlet operations of the Euro warehouse coal storage equipment and is not conducive to the normal coal storage operation of the Euro warehouse.

[0014] Since the central telescopic drop pipe of the Euro warehouse adopts a nested structure, when the spiral frame is not at the lowest position in the warehouse, there will always be several sections of the telescopic drop pipes nested and overlapped, that is, they are not extended. At this time, the lower end of the drop pipe is very close to the drop point. When dropping, some coal dust will inevitably expand upward along the wall of the drop pipe with the airflow. In this way, the coal will be deposited between the walls of the drop pipes that are nested and overlapped with each other. When the amount of accumulated coal reaches a certain level, the telescopic drop pipes will form a bond. This situation is caused by the close distance between the existing central telescopic drop pipe of the Euro warehouse and the drop point.

[0015] The bottom of the central telescopic drop tube is facing the drop point at the center of the spiral frame. The central drop tube is a circular structure. The falling coal can present a cylindrical feature, but the drop point area adopts a triangular discharge area. The triangular discharge area adopts a grid coal to reduce the impact of coal, and the outside of the triangle is a plane. Such a feature can easily cause the accumulation of coal outside the triangular discharge area. When the coal accumulates to a certain height, it will touch the lower mouth of the telescopic drop tube. When the coal is more viscous, the coal that enters the gap between the sections of the drop tube will cause adhesion between the central telescopic drop tubes and cause jamming.

[0016] Due to the nested structure of the central telescopic drop tube, it is difficult to arrange the drop tube coal blockage detection sensor in the existing drop tube. Once encountering coal with high viscosity, the coal at the discharge port cannot flow out quickly, and siltation will occur at the bottom drop point in the drop tube, resulting in coal blockage, which will block the coal from entering the warehouse. The accumulated coal will accumulate all the way to the feed port on the top of the Euro warehouse. At this time, the central telescopic drop tube is full of coal, which increases the weight acting on the spiral frame, endangering the safe operation of the Euro warehouse and easily causing major equipment accidents.

[0017] Part of the receiving point facing the lower end of the central telescopic drop pipe of the Euro warehouse has a flat feature. When encountering coal with high viscosity, it is very easy to accumulate coal, thereby reducing the discharge flow rate and even causing coal blockage, which interrupts the operation of coal transportation into the warehouse. Because the central telescopic drop pipe adopts a nested structure, when coal is blocked in the discharge area, it cannot directly contact the blocked coal area, making manual cleaning difficult.

[0018] The above-mentioned problems are the frequent failures of the existing coal storage Euro warehouse equipment when encountering coal with high viscosity. These failures are also caused by the fact that the existing structure cannot adapt to coal with high viscosity. Summary of the invention

[0019] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a coal-dropping pipe device for a coal storage bin, which can effectively reduce the sticking and coal blockage of the central telescopic dropping pipe, avoid damage to the bin equipment, improve the adaptability of the bin to sticky coal, and improve the stability of the operation of the coal storage bin.

[0020] The objectives of the present invention can be achieved through the following technical solutions: a coal-blocking prevention coal-dropping pipe device for a coal storage bin, comprising a central telescopic dropping pipe, an anti-blocking coal-dropping pipe and a dropping pipe mounting seat connected in sequence, the middle part of the first section of the circular tube of the central telescopic dropping pipe is a conical tube structure with a small upper part and a large lower part, the first section of the circular tube is connected to the upper end of the anti-blocking coal-dropping pipe, a dust return plate is provided in the anti-blocking coal-dropping pipe, which is used to guide the dust-containing gas generated by the coal falling point below and ascending along the pipe wall to the bottom, so as to prevent the dust-containing gas from ascending along the cylinder wall to the gap between the circular tube walls of the central telescopic dropping pipe, and an exhaust port is provided on the anti-blocking coal-dropping pipe, which is used to discharge the internal dust-containing gas to the outside of the anti-blocking coal-dropping pipe.

[0021] Furthermore, the anti-blocking coal drop pipe includes a flange interface, a drop pipe straight section, a drop pipe inclined section, and a triangular straight section drop pipe connected in sequence, the flange interface is connected to the lower port of the first section of the circular pipe, the dust return plate is arranged at the connection position between the drop pipe straight section and the flange interface, and the exhaust port is opened on the upper end pipe wall of the drop pipe straight section.

[0022] Furthermore, an air collecting ring for collecting dust-containing gas is arranged at the periphery of the exhaust port, and the air collecting ring is connected to an air guide pipe, and the air guide pipe is used to guide the collected dust-containing gas to the coal accumulation area below.

[0023] Furthermore, a dust removal device or an exhaust fan is installed at the outlet of the air duct to accelerate the removal of dust-containing gas.

[0024] Furthermore, a blockage sensor mounting seat is provided at the lower end of the straight section of the drop pipe for installing and connecting a blockage sensor, and the blockage sensor is used to detect the coal accumulation state in the drop pipe device. A sensor shield is provided on the blockage sensor mounting seat for protecting the blockage sensor from being damaged by the falling coal.

[0025] Furthermore, an inspection door that can be opened and closed is provided on the wall surface of the inclined surface section of the drop pipe to facilitate inspection and maintenance by users.

[0026] Furthermore, a horizontal reinforcing rib and a fixed mounting surface are provided at the lower end of the drop tube inclined surface section, and the fixed mounting surface is connected to the drop tube mounting seat via a rubber buffer and a guide rod.

[0027] Furthermore, an arc baffle is provided at the upper end of the triangular straight-section feeding pipe to form a triangular columnar feeding pipe. The two sides of the lower end of the triangular straight-section feeding pipe are directly connected with the two sides of the triangle of the coal outlet on the plane of the dropping area. Two sealing plates are arranged on both sides of the dropping port on the plane of the dropping area. The plane of the dropping area and the coal outlet are separated in the guide trough by the sealing plates and the triangular straight-section feeding pipe, ensuring that all the fallen coal is concentrated on the triangular inlet before being discharged, so as to avoid the accumulation of fallen coal on the plane of the dropping area.

[0028] Furthermore, the upper port of the first section of the circular tube is a sealing ring, which is used to close the gap between the first section of the circular tube and the second section of the circular tube at the upper port of the first section of the circular tube, and can ensure that the second section of the circular tube can slide up and down relative to the first section of the circular tube. The lower port of the first section of the circular tube is the flange interface of the first section of the circular tube, which is used to be connected and fixed to the flange interface of the anti-blocking coal drop pipe.

[0029] Furthermore, the sealing ring is made of rubber or polyurethane material.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] The present invention sets a connecting anti-blocking coal dropping pipe between the central telescopic dropping pipe and the dropping pipe mounting seat, and designs the first section of the central telescopic dropping pipe into a conical pipe structure with a small upper part and a large lower part in the middle, so as to increase the space between the first section of the circular pipe and the second section of the circular pipe, and avoid the coal sticking together between the first section of the circular pipe, and also connects the first section of the circular pipe to the upper end of the anti-blocking coal dropping pipe, and the anti-blocking coal dropping pipe is provided with a dust return plate and an exhaust port, and the dust return plate is used to guide the dust-containing gas generated by the lower coal drop point and ascending along the pipe wall to the bottom, so as to avoid the dust-containing gas ascending along the cylinder wall to the gap between the circular pipe walls of the central telescopic dropping pipe, and the exhaust port is used to discharge the internal dust-containing gas to the outside of the anti-blocking coal dropping pipe. In this way, the blocking and coal blocking phenomena of the central telescopic dropping pipe can be effectively reduced, the damage of the Euro warehouse equipment can be avoided, and the adaptability of the Euro warehouse to sticky coal can be improved, thereby greatly improving the stability of the operation of the Euro warehouse coal storage.

[0032] The anti-blocking coal dropping pipe designed in the present invention includes a flange interface, a straight section of the dropping pipe, an inclined section of the dropping pipe, and a triangular straight section dropping pipe which are connected in sequence. The flange interface is connected to the lower port of the first section of the circular pipe. A blockage sensor is installed at the lower end of the straight section of the dropping pipe through a blockage sensor mounting seat. The exhaust port is opened on the upper end pipe wall of the straight section of the dropping pipe. An openable and closable inspection door is also opened on the wall surface of the inclined section of the dropping pipe, thereby achieving the purpose of coal blockage detection and dust-containing gas discharge, and avoiding damage to the Euro warehouse equipment caused by a large amount of coal accumulation inside the dropping pipe due to blockage.

[0033] The present invention arranges an annular air accumulation ring and an air guide pipe on the outside of the exhaust port, which can collect the dust-containing gas discharged from the exhaust port in the air accumulation ring, and then guide it to the coal accumulation area below through the air guide pipe. In addition, dust removal equipment or an exhaust fan can be installed at the outlet of the air guide pipe to treat and purify the dust-containing gas or to accelerate the discharge of the dust-containing gas, thereby effectively preventing the dust-containing gas from climbing upward along the pipe wall in the central telescopic blanking pipe and entering the gap between the pipe walls, reducing the coal sticking to the pipe wall, and improving the reliability of the mutual sliding action between the circular pipes of the central telescopic blanking pipe.

[0034] The present invention adopts a circular tube wall at the upper part of the anti-blocking coal dropping pipe, that is, a straight section of the dropping pipe, and adopts an inclined section of the dropping pipe at the lower part of the anti-blocking coal dropping pipe. The inclined section is designed to be consistent with the size of the triangular inlet of the coal dropping outlet at the dropping point. The lower part adopts a triangular straight-section dropping pipe and an arc baffle to form a triangular columnar dropping pipe. The two sides of the lower end of the dropping pipe are directly connected with the two sides of the triangle of the coal dropping outlet on the plane of the dropping area. Two sealing plates are arranged on both sides of the dropping outlet on the plane of the dropping area. In this way, the sealing plate and the triangular straight-section dropping pipe are used to separate the dropping area plane and the coal dropping outlet in the guide trough, thereby ensuring the dropped coal All coal is concentrated on the triangular inlet and then output to avoid accumulation of fallen coal on the plane of the dropping area and eliminate coal accumulation on the plane of the dropping area. Coal entering the coal dropping area at the bottom from the telescopic dropping pipe in the center of the Euro bin will not accumulate on the plane of the dropping area, but will directly fall onto the coal output port and then enter the Euro bin through the port. Since the inclined section of the dropping pipe, the triangular straight section of the dropping pipe and the arc baffle have smooth surfaces and there is an angle between the inclined surface and the horizontal plane, coal with high viscosity cannot accumulate in the bottom guide trough of the telescopic dropping pipe in the center of the Euro bin, thereby improving the Euro bin's ability to pass sticky coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall structure of the Euro warehouse;

[0036] Figure 2 It is a schematic diagram of the structure of the existing central telescopic blanking tube;

[0037] Figure 3 It is a schematic diagram of the guide trough structure;

[0038] Figure 4 It is a schematic diagram of the connection between the existing central telescopic blanking tube and the blanking point;

[0039] Figure 5 It is a cross-sectional schematic diagram of the connection between the existing central telescopic blanking tube and the blanking point;

[0040] Figure 6 It is the installation schematic diagram of the present invention;

[0041] Figure 7 for Figure 6 Schematic cross-sectional view of ;

[0042] Figure 8 This is a schematic diagram of the anti-blocking coal drop pipe in the present invention;

[0043] Fig. 9 It is a schematic diagram of the central telescopic blanking tube in the present invention;

[0044] Fig.10 It is a schematic diagram of the connection between the air accumulation ring and the air guide pipe in the present invention;

[0045] Fig.11 It is a schematic diagram of the assembly of the anti-blocking coal dropping pipe in the present invention;

[0046] Description of the markings in the figure:

[0047] Figure 1 Middle: 1. Euro warehouse cylinder silo wall, 2. Euro warehouse feed port, 3. Euro warehouse roof trestle, 4. Rotating trestle, 5. Rotating trestle walking device, 6. Central telescopic drop pipe, 7. Spiral frame lifting wire rope, 8. Spiral frame, 9. Screw machine, 10. Guide chute, 11. Spiral frame A-frame, 12. Central winch platform, 13. Central rotating platform, 14. Spiral frame central platform;

[0048] Figure 2 Middle: 6-1, first section of round tube, 6-1-1, first section of round tube anchor flange, 6-1-2, guide rod hole, 6-1-3, buffer fixing bolt hole, 6-1-4, reinforcing rib, 6-1-5, limit retaining ring, 6-2, second section of round tube, 6-3, third section of round tube, 6-4, fourth section of round tube, 6-5, fifth section of round tube;

[0049] Figure 3 Middle: 10, guide trough, 17, drop tube mounting seat, 17-1, mounting interface, 17-2, fixed support frame, 18, rubber buffer, 19, guide rod, 17-1, buffer fixing bolt hole;

[0050] Figure 4 Middle: 6, central telescopic drop pipe, 6-1, drop pipe, 10, guide trough, 14, spiral frame center platform, 16, coal output port, 16-1, grid plate, 17, drop pipe mounting seat, 17-1, mounting interface, 17-2, fixed support frame, 18, rubber buffer, 19, guide rod, 17-1, buffer fixing bolt hole;

[0051] Figure 5 Middle: 6, central telescopic drop tube, 6-1, drop tube, 10, guide trough, 14, spiral frame center platform, 14-1, drop area plane (coal accumulation area), 15, gap between round tube walls, 16, coal drop area output port, 16-1, grid plate, 16-2, triangular feed port, 17, drop tube mounting seat, 17-1, mounting interface, 17-2, fixed support frame, 18, rubber buffer, 19, guide rod;

[0052] Figure 6 , 7Middle: 6, central telescopic drop pipe, 6-111, first section of round pipe, 10, guide trough, 14, central platform of spiral frame, 14-1 drop area plane (coal accumulation area), 16, coal drop area output port, 16-1, grid plate, 17, drop pipe mounting seat, 17-1, mounting interface, 17-2, fixed support frame, 18, rubber buffer, 19, guide rod, 20-1, flange interface, 20-2, exhaust port, 20-3, drop pipe straight section, 20-4, drop pipe inclined section, 20-6, triangular straight section drop pipe, 20-7, arc baffle, 20-8, fixed mounting surface, 20-9, fastening bolts, 20-10, inspection door, 20-11, blocking sensor mounting seat, 20-12, dust return plate, 21-1, gas accumulation ring, 21-2, air guide pipe, 22 coal blocking sensor, 23. sealing plate;

[0053] Figure 8 Middle: 20-1, flange interface, 20-2, exhaust port, 20-3, straight section of drop pipe, 20-4, inclined section of drop pipe, 20-5, horizontal reinforcing rib plate, 20-6, triangular straight section drop pipe, 20-7, arc baffle, 20-8, fixed installation surface, 20-9, fastening bolts, 20-10, inspection door, 20-11 blocking sensor mounting seat;

[0054] Fig. 9 Middle: 6-111, first section of round tube, 6-111-1, first section of round tube flange interface, 6-111-2, sealing ring, 6-2, second section of round tube, 6-3, third section of round tube, 6-4, fourth section of round tube, 6-5, fifth section of round tube;

[0055] Fig.10 Middle: 21-1, gas ring, 21-2, airway;

[0056] Fig.11 Middle: 20-1, flange interface, 20-2, exhaust port, 20-3, straight section of drop pipe, 20-4, inclined section of drop pipe, 20-5, horizontal reinforcing rib plate, 20-6, triangular straight section drop pipe, 20-7, arc baffle, 20-8, fixed installation surface, 20-9, fastening bolts, 20-10, inspection door, 20-11, blockage sensor mounting seat, 20-11-1, sensor cover, 20-12, dust return plate, 21-1, air accumulation ring, 21-2, air guide pipe. DETAILED DESCRIPTION

[0057] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] Example

[0059] like Figure 5As shown, the existing Euro warehouse central drop pipe 6 is composed of several sections of circular tubes with different diameters nested together concentrically, and the adjacent two sections of circular tubes can be dragged with each other to form a drop pipe device with a telescopic circular tube group. When the coal adheres to the tube wall or the gap 15 between the tube walls when nested and overlapped, the bonded coal will hinder the normal sliding movement between the circular tubes. Since the lower end of the overlapping circular tube group is close to the coal drop point, and the Euro warehouse drop point adopts the method of reducing the impact force of coal on the bearing surface by silting up coal, it is easy to cause the lower end of the telescopic drop pipe to directly contact the silted coal, resulting in various faults; in addition, the structure of the existing Euro warehouse drop point makes it difficult for personnel to enter and handle the situation. Once the central drop pipe is blocked by coal, it will not be able to feedback and stop in time. These problems have caused the reliability of the Euro warehouse coal to be reduced when it encounters coal with high viscosity, the difficulty of personnel handling, the high maintenance cost and the long maintenance time.

[0060] To this end, this solution improves the existing Euro warehouse central telescopic drop pipe structure and installation connection (the first section of the central telescopic drop pipe 6-1 is directly connected to the installation interface 17-1 of the drop pipe mounting seat 17 on the guide trough 10) to solve various related problems and shortcomings that occur when the existing Euro warehouse stores coal with high viscosity. Figure 6 and Figure 7 As shown, a device for preventing coal from blocking the dropping pipe for a coal storage Euro warehouse is provided. A section of the coal blocking dropping pipe 20 is installed between the improved central telescopic dropping pipe 6 and the dropping pipe mounting seat 17 on the guide trough 10. The coal blocking detection, dusty gas discharge, and coal siltation at the dropping point are realized through the coal blocking dropping pipe 20, so as to solve the problem of the expansion and contraction of the central telescopic dropping pipe 6 and improve the adaptability of the Euro warehouse to various coals. The upper end of the coal blocking dropping pipe 20 is fixed to the first section of the circular pipe 6-111 of the improved central telescopic dropping pipe 6 through a flange connection, and the lower part of the coal blocking dropping pipe 20 is connected to the dropping pipe mounting seat 17 through a fixed mounting surface 20-8. The connection method of the rubber buffer 18 and the guide rod 19 is still used to ensure that the entire central telescopic dropping pipe 6, the coal blocking dropping pipe 20, and the dropping point will not transmit the impact force generated when the coal enters to each other.

[0061] like Figure 8 As shown, the anti-blocking coal feeding pipe 20 is mainly composed of a flange interface 20-1, an exhaust port 20-2, a straight section of the feeding pipe 20-3, an inclined section of the feeding pipe 20-4, a horizontal reinforcing rib plate 20-5, a triangular straight section feeding pipe 20-6, an arc baffle 20-7, a fixed installation surface 20-8, a fastening bolt 20-9, an inspection door 20-10, a blocking sensor mounting seat 20-11 and other components.

[0062] The upper port of the anti-blocking coal dropping pipe 20 is a flange interface 20-1, which is connected to the lower port of the improved central telescopic dropping pipe 6 through a flange. The lower port of the anti-blocking coal dropping pipe is a fixed mounting surface 20-8, which can be connected to the dropping pipe mounting seat 17 on the existing material guide trough 10. The connection method is the same as the connection method of the first section of the circular tube 6-1 of the existing central telescopic dropping pipe 6, and is also connected through a rubber buffer 18 and a guide rod 19.

[0063] like Fig. 9 As shown, the upper end of the first section circular tube 6-111 of the improved central telescopic drop tube 6 is a sealing ring 6-111-2, through which the gap between the first section circular tube 6-111 and the second section circular tube 6-2 is closed at the upper end of the first section circular tube 6-111, and the second section circular tube 6-2 can be guaranteed to slide up and down relative to the first section circular tube 6-111. The sealing ring 6-111-2 can be made of polymer compounds such as rubber or polyurethane, and the lower end is the flange interface 6-111-1 of the first section circular tube, which can be connected and fixed with the flange interface 20-1 of the anti-blocking coal drop tube 20. The middle part of the first section circular tube 6-111 presents a conical tube feature with a small upper part and a large lower part, so as to increase the space between the first section circular tube 6-2 and avoid the coal sticking to the second section circular tube 6-2.

[0064] In order to collect the dusty gas discharged from the exhaust port 20-2 on the anti-blocking coal drop pipe 20, an air accumulation ring 21-1 and an air guide pipe 21-2 (such as Fig.10 As shown), the assembly effect is as follows Fig.11 shown.

[0065] In actual application, first, the overlapping circular tubes of the unextended part of the central telescopic drop tube 6 are raised, and an anti-blocking coal drop tube 20 is placed between it and the drop tube mounting seat 17 (if it is used in the modification of the existing central drop tube of the Euro warehouse, it is necessary to consider that the spiral machine 9 and the spiral platform 14 are at the highest position when the Euro warehouse is full. Before adding the anti-blocking coal drop tube 20, it is necessary to confirm in advance the margin of the upper stroke when the telescopic drop tube 6 is contracted or appropriately reduce the coal storage capacity of the Euro warehouse. If it is used in a newly designed Euro warehouse, it can be directly modified and installed). The upper port of the anti-blocking coal drop tube 20 is fixed to the first section of the circular tube 6-111 of the central telescopic drop tube 6 through a flange connection, and the middle fixed mounting surface 20-8 is connected to the drop tube mounting seat 17. A dust return plate 20-12 is provided inside the anti-blocking coal drop tube 20 to guide the dust-containing gas generated by the coal drop point below and upward along the pipe wall At the bottom, dust-containing gas is prevented from ascending along the cylinder wall to the gap 15 between the circular tube walls of the central telescopic blanking tube. At the same time, a certain number of exhaust ports 20-2 are opened on the circumference of the tube wall at this position to discharge part of the dust-containing gas to prevent blocking the outside of the coal blanking tube 20. An annular air accumulation ring 21-1 and an air guide pipe 21-2 are arranged on the periphery of the exhaust port 20-2 to collect the dust-containing gas discharged from the exhaust port 20-2 in the air accumulation ring 21-1, and then guide it to the coal accumulation area below through the air guide pipe 21-2. Dust removal equipment or exhaust fans can be further installed at the outlet of the air guide pipe 21-2 to treat and purify the dust-containing gas or accelerate the discharge of the dust-containing gas. This method can effectively prevent the dust-containing gas from climbing up along the tube wall in the central telescopic blanking tube and entering the gap 15 between the tube walls, thereby reducing the coal sticking to the tube wall and improving the reliability of the mutual sliding action between the circular tubes of the central telescopic blanking tube.

[0066] An inspection door 20-10 is provided on the anti-blocking coal drop pipe 20. The inspection door 20-10 is closed at ordinary times, but can be opened when personnel are needed to handle it, so that it is convenient for personnel to handle abnormal situations occurring at the coal drop point and can ensure the safety of personnel.

[0067] A blocking sensor 22 is arranged on the anti-blocking coal drop pipe 20. For this purpose, a blocking sensor mounting seat 20-11 is required, and the blocking sensor 22 is protected from being damaged by the falling coal through a sensor shield 20-11-1. The blocking sensor 22 is used to detect the coal accumulation in the anti-blocking coal drop pipe 20. When the height of the coal accumulation reaches a certain position, a signal is sent out, and the coal feeding amount can be reduced or stopped according to the signal. After the coal blocking situation is eliminated, the coal feeding operation is resumed, so as to avoid the contact between the accumulated coal at the drop point and the wall of the central drop pipe, which can reduce the jamming failure of the telescopic drop pipe and the unsafe problem caused by the accumulation of coal at the top of the central drop pipe in the Euro warehouse.

[0068] The upper part of the anti-blocking coal dropping pipe 20 adopts a circular pipe wall, that is, a straight section 20-3 of the dropping pipe, and the lower part of the anti-blocking coal dropping pipe 20 adopts a slope section 20-4 of the dropping pipe. The slope section is designed to be consistent in size with the triangular inlet 16-2 of the coal outlet 16 at the dropping point. The lower part adopts a triangular straight section of the dropping pipe 20-6 and an arc baffle 20-7 to form a triangular columnar dropping pipe. The two sides of the lower end of the dropping pipe are directly connected to the triangular inlet 16 of the coal outlet 16 on the dropping area plane 14-1. The two sides of the shape are butted, and two sealing plates 23 are arranged on both sides of the dropping port on the dropping area plane 14-1. The dropping area plane 14-1 and the coal dropping outlet 16 are separated in the guide trough 10 by the sealing plates 23 and the triangular straight dropping pipe 20-6 of the anti-blocking coal dropping pipe 20, so as to ensure that all the dropped coal is concentrated on the triangular inlet 16-2 and then output, thereby avoiding the accumulation of the dropped coal on the dropping area plane 14-1 and eliminating the accumulated coal on the dropping area plane 14-1. The anti-blocking coal dropping pipe 20 designed by the present scheme enters the coal dropping area at the bottom from the telescopic dropping pipe in the center of the Euro bin, and will not accumulate on the plane 14-1 of the dropping area, but will directly fall onto the coal dropping outlet 16, and then enter the Euro bin through the outlet. The special structure of the anti-blocking coal dropping pipe 20 - the surface of the dropping pipe inclined section 20-4, the triangular straight section dropping pipe 20-6 and the arc baffle 20-7 are smooth, and the angle between the inclined surface and the horizontal plane is greater than 70°. Even the coal with high viscosity cannot be accumulated in the bottom guide groove 10 of the central telescopic dropping pipe 6 of the Euro bin, which effectively improves the Euro bin's ability to pass sticky coal. In actual applications, the triangular straight section dropping pipe 20-6 and the dropping pipe inclined section 20-4 can also be designed to be made of materials with good wear resistance, or a wear-resistant support plate (ceramic or wear-resistant steel plate can be used) can be installed inside to further improve the service life of the anti-blocking coal dropping pipe 20.

[0069] In summary, this solution can reduce various blockages and coal belly failures of the central telescopic drop pipe 6 caused by coal stickiness and wetness, and can reduce the serious consequences caused by the failure of the Euro warehouse to store coal normally. At the same time, it has the functions of coal blockage detection, dusty gas discharge, and coal accumulation prevention at the drop point.

Claims

1. A coal-storage silo anti-blocking coal-dropping pipe, characterized in that: The invention comprises a central telescopic drop pipe (6), an anti-blocking coal drop pipe (20) and a drop pipe mounting seat (17) which are connected in sequence. The middle part of the first section of the circular pipe of the central telescopic drop pipe (6) is a conical pipe structure with a small upper part and a large lower part. The first section of the circular pipe is connected to the upper end of the anti-blocking coal drop pipe (20). A dust return plate (20-12) is arranged in the anti-blocking coal drop pipe (20) for guiding the dust-containing gas generated by the coal drop point below and ascending along the pipe wall to the bottom, so as to prevent the dust-containing gas from ascending along the cylinder wall to the gap between the circular pipe walls of the central telescopic drop pipe (6). An exhaust port (20-2) is provided on the anti-blocking coal drop pipe (20) for discharging the internal dust-containing gas to the outside of the anti-blocking coal drop pipe (20).

2. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 1 is characterized in that: The anti-blocking coal drop pipe (20) comprises a flange interface (20-1), a drop pipe straight section (20-3), a drop pipe inclined section (20-4), and a triangular straight section drop pipe (20-6) connected in sequence; the flange interface (20-1) is connected to the lower end of the first section of the circular pipe; the dust return plate (20-12) is arranged at the connection position between the drop pipe straight section (20-3) and the flange interface (20-1); and the exhaust port (20-2) is opened on the upper end pipe wall of the drop pipe straight section (20-3).

3. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 2 is characterized in that: An air collecting ring (21-1) for collecting dusty gas is arranged at the periphery of the exhaust port (20-2); the air collecting ring (21-1) is connected to an air guide pipe (21-2); and the air guide pipe (21-2) is used to guide the collected dusty gas to the coal accumulation area below.

4. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 3 is characterized in that: A dust removal device or an exhaust fan is installed at the outlet of the air guide pipe (21-2) to accelerate the removal of dust-containing gas.

5. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 2, characterized in that: A material blocking sensor mounting seat (20-11) is provided at the lower end of the drop pipe straight section (20-3) for mounting and connecting a material blocking sensor, the material blocking sensor being used to detect the coal accumulation state in the drop pipe device, and a sensor shield is provided on the material blocking sensor mounting seat (20-11) for protecting the material blocking sensor from being damaged by the falling coal.

6. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 2, characterized in that: An inspection door (20-10) that can be opened and closed is provided on the wall surface of the drop pipe inclined surface section (20-4) to facilitate inspection and maintenance by users.

7. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 2, characterized in that: The lower end of the drop tube inclined surface section (20-4) is provided with a horizontal reinforcing rib and a fixed installation surface, and the fixed installation surface is connected to the drop tube mounting seat (17) via a rubber buffer (18) and a guide rod (19).

8. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 2, characterized in that: The upper end of the triangular straight section feeding pipe (20-6) is provided with an arc baffle (20-7) to form a triangular columnar feeding pipe. The two sides of the lower end of the triangular straight section feeding pipe (20-6) are directly connected to the two sides of the triangle of the coal outlet on the plane of the feeding area. Two sealing plates (23) are arranged on both sides of the feeding outlet on the plane of the feeding area. The sealing plates (23) and the triangular straight section feeding pipe (20-6) separate the feeding area plane and the coal outlet in the guide groove (10), ensuring that all the fallen coal is concentrated on the triangular inlet before being discharged, so as to avoid the accumulation of the fallen coal on the plane of the feeding area.

9. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 2, characterized in that: The upper end of the first section of the circular tube is a sealing ring (6-111-2), which is used to close the gap between the first section of the circular tube and the second section of the circular tube at the upper end of the first section of the circular tube and to ensure that the second section of the circular tube can slide up and down relative to the first section of the circular tube. The lower end of the first section of the circular tube is a flange interface (20-1) of the first section of the circular tube, which is used to be connected and fixed to the flange interface (20-1) of the anti-blocking coal feeding pipe (20).

10. The anti-blocking coal dropping pipe for coal storage Euro warehouse according to claim 9, characterized in that: The sealing ring (6-111-2) is made of rubber or polyurethane material.

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